CN112504936B

CN112504936B - Testing device and testing method for simulating and researching permeability of deep coal bed methane

Info

Publication number: CN112504936B
Application number: CN202011369256.1A
Authority: CN
Inventors: 李松; 汤达祯; 林文姬; 钟广浩; 冯鹏
Original assignee: China University of Geosciences Beijing
Current assignee: China University of Geosciences Beijing
Priority date: 2020-11-30
Filing date: 2020-11-30
Publication date: 2021-12-03
Anticipated expiration: 2040-11-30
Also published as: CN112504936A

Abstract

A test device for simulating and researching permeability of deep coal bed gas comprises a material bin, a belt conveyor, a test bin, a test platform, a lifting mechanism, a lifting bearing plate, a plurality of first hydraulic oil cylinders, an air pump, a coal bed gas storage tank, a plurality of coal bed gas content sensors and a computer control system, wherein the material bin, the belt conveyor and the test bin are sequentially arranged from front to back; the middle part is provided with vertical baffle along the front-back direction is fixed in the material storehouse, and vertical baffle separates the inside left and right sides in material storehouse for soil storehouse and buggy storehouse, and the back side of rectangle dog-house rotates and installs the clamp plate subassembly, and the lower part of clamp plate subassembly corresponds the last port in shutoff test storehouse, installs a plurality of detecting tubes on the clamp plate subassembly, and each coalbed methane content sensor corresponds the upper end of installing at each detecting tube respectively. The method can simulate and test the permeability of the underground coal bed structure under different underground pressures and different temperatures, realize remote survey and save cost.

Description

Testing device and testing method for simulating and researching permeability of deep coal bed methane

Technical Field

The invention relates to the field of deep coal bed gas simulation tests, in particular to a test device and a test method for simulating and researching the permeability of deep coal bed gas.

Background

Coal bed gas is a clean and high-quality energy and chemical raw material which rises internationally in nearly twenty years, the content of underground coal bed gas in China is huge, a great amount of coal bed gas in deep layers below is not discovered temporarily, the existing exploration modes are generally modes such as geophysical prospecting, drilling, well logging, leading mining and the like, but the modes all need field exploration and large mechanical equipment for field exploration, exploration cannot be carried out on places where large machinery cannot enter due to the fact that the address environment needing to be surveyed is harsh, the operation time of the large machinery is long, the exploration progress is slow, and the labor time cost is high.

Disclosure of Invention

The invention aims to provide a test device and a test method for simulating and researching the permeability of deep coal bed methane.

In order to achieve the purpose, the invention adopts the following technical scheme:

a test device for simulating and researching permeability of deep coal bed gas comprises a material bin, a belt conveyor, a test bin, a test platform, a lifting mechanism, a lifting bearing plate, a plurality of first hydraulic oil cylinders, an air pump, a coal bed gas storage tank, a plurality of coal bed gas content sensors and a computer control system, wherein the material bin, the belt conveyor and the test bin are sequentially arranged from front to back;

the material bin is fixedly supported on the ground through four first supporting columns, the test platform is horizontally arranged right above the test bin, the test bin is a rectangular box body with an open top, the periphery of the bottom of the test platform is fixedly supported on the ground through four second supporting columns and is positioned on the rear side of the belt conveyor, a rectangular feeding port which is through up and down and is positioned right above the test bin is arranged in the middle of the test platform, a vertical partition plate is fixedly arranged in the middle of the material bin along the front-back direction, the vertical partition plate divides the interior of the material bin into a soil bin and a pulverized coal bin left and right, a soil discharge pipe and a pulverized coal discharge pipe are arranged at the bottom of the rear side of the material bin at intervals left and right, the front end of the soil discharge pipe is communicated with the interior of the soil bin, the front end of the pulverized coal discharge pipe is communicated with the interior of the pulverized coal bin, the belt conveyor is arranged along the front-back direction and is inclined with the front lower part and back part, and the belt conveyor conveys materials from front part to back part, the front end of the belt conveyor is a material receiving end, the rear end of the belt conveyor is a material output end, the bottom of the front end of the belt conveyor is fixedly supported on the ground, the bottom of the rear end of the belt conveyor is fixedly supported in the middle of the front side of the test platform, the rear ends of the soil discharge pipe and the coal powder discharge pipe are correspondingly arranged above the front end of the belt conveyor, a soil switch ball valve is arranged on the soil discharge pipe, a coal powder switch ball valve is arranged on the coal powder discharge pipe, the rear end of the belt conveyor is positioned on the front side above the rectangular feed opening, a pressure plate assembly covering the rectangular feed opening is rotatably arranged on the rear side edge of the rectangular feed opening, the lower part of the pressure plate assembly correspondingly plugs the upper port of the test bin, a plurality of vertical detection tubes penetrating through the pressure plate assembly are arranged on the pressure plate assembly, the lower ends of the detection tubes are flush with the bottom of the pressure plate assembly, and the upper ends of the detection tubes are positioned on the upper side of the pressure plate assembly, each coal bed gas content sensor is respectively and correspondingly arranged at the upper end of each detection pipe, a vertical support plate is fixedly arranged in the middle of the rear side of the test platform, a second hydraulic cylinder is hinged between the upper part of the front side of the vertical support plate and the middle of the top surface of the pressing plate component, a vertical guide rail is respectively and fixedly connected between the front side and the rear side of the bottom of the test platform and the ground, the vertical guide rail at the front side is positioned at the front side of the test chamber, the vertical guide rail at the rear side is positioned at the rear side of the test chamber, the front side surface and the rear side surface of the test chamber are respectively and slidably connected with the front vertical guide rail and the rear vertical guide rail through a sliding block, a lifting mechanism is fixedly arranged on the test platform, a lifting bearing plate is arranged below the test chamber, each first hydraulic cylinder is respectively and vertically and fixedly arranged on the lifting bearing plate and is arranged in a matrix, and the bottom of the test chamber is fixedly supported at the top of a piston rod of each first hydraulic cylinder, the bottom in experimental storehouse is provided with the pressure sensor who is located each first hydraulic cylinder's piston rod top, hoist mechanism is connected around with the promotion loading board, four side middle parts in experimental storehouse all are connected with a gas piping, four gas piping's air inlet are connected with the coal bed gas storage tank through a gas injection pipe, the air pump sets up on the gas injection pipe, computer control system respectively with band conveyer, hoist mechanism, each first hydraulic cylinder, the air pump, each coal bed gas content sensor, second hydraulic cylinder and each pressure sensor signal connection.

The lifting mechanism comprises two third hydraulic oil cylinders, a lifting shaft and two sets of cable assemblies, wherein the two third hydraulic oil cylinders are vertically arranged, the two third hydraulic oil cylinders are bilaterally and fixedly arranged in the middle parts of the left side and the right side of the pressing plate assembly, the tops of piston rods of the two third hydraulic oil cylinders are respectively provided with an ear seat, a central hole of each ear seat is horizontally arranged along the left and right direction, the lifting shaft is horizontally arranged along the left and right direction and correspondingly penetrates through the central holes hinged to the two ear seats, the left end of the lifting shaft is positioned on the left side above the left side of the test platform, the right end of the lifting shaft is positioned on the right side above the right side of the test platform, and the two sets of cable assemblies are identical in structure and are bilaterally and symmetrically arranged at the left and right ends of the lifting shaft;

the left cable assembly comprises a lifting block, two cables and two lifting pulleys, the lifting block is fixedly arranged at the left end of a lifting shaft, the plane where the lifting block is located is vertically arranged along the front-back direction, the lifting block is of an inverted V-shaped structure, two corners of the lower side of the lifting block are fixedly provided with first lifting rings, the two lifting pulleys are respectively and symmetrically rotatably arranged at the front side and the rear side of the left side of the lifting bearing plate in the front-back direction, the central shaft of the lifting pulley is horizontally arranged along the left-right direction, the front side and the rear side of the left side of the test platform are respectively and fixedly provided with second lifting rings, the vertical projection of the lifting pulley at the front side is positioned between the vertical projection of the first lifting ring at the front side and the vertical projection of the second lifting ring at the front side, the vertical projection of the lifting pulley at the rear side is positioned between the vertical projection of the first lifting ring at the rear side and the vertical projection of the second lifting ring at the rear side, the two cables are symmetrically arranged in the front-back direction, the cable one end hook of front side is on the first rings of front side, the cable other end of front side is walked around the promotion pulley of front side and is hooked on the second rings of front side, the cable one end hook of rear side is on the first rings of rear side, the cable other end of rear side is walked around the promotion pulley of rear side and is hooked on the second rings of rear side, the equal fixed mounting all around of bottom that promotes the loading board has the third pillar, computer control system respectively with two third hydraulic cylinder signal connection.

The pressing plate component comprises a supporting steel plate, an upper pressing steel plate and a lower pressing steel plate, the supporting steel plate, the upper pressing steel plate and the lower pressing steel plate are sequentially arranged at intervals from top to bottom and are of rectangular plate structures and are positioned right above an upper port of the test chamber, the length of the front side edge of the supporting steel plate is the same as that of the front side edge of the rectangular feed opening, the length of the left side edge of the supporting steel plate is smaller than that of the left side edge of the rectangular feed opening, the rear side edge of the supporting steel plate is hinged to a rear side edge test platform of the rectangular feed opening through a plurality of hinges, limit long baffles are fixedly arranged on the left side portion and the right side portion of the front side edge of the supporting steel plate, the length direction of each limit long baffle is arranged along the front-back direction, the front side portion of each limit long baffle is lapped on the upper portion of the front side edge of the rectangular feed opening, the bottom of a cylinder body of the second hydraulic cylinder is hinged to the middle portion of the upper surface of the supporting steel plate, the top of a piston rod of the second hydraulic cylinder is hinged to the upper portion of the front side of the vertical support plate, a hinged shaft at the bottom of a cylinder body of the second hydraulic cylinder and a hinged shaft at the top of a piston rod of the second hydraulic cylinder are horizontally arranged along the left-right direction, two third hydraulic cylinders are bilaterally and symmetrically fixedly arranged at the middle parts of the left side and the right side of the upper surface of a supporting steel plate, a plurality of vertically arranged fourth hydraulic cylinders are arranged on the lower surface of the supporting steel plate, piston rods of the fourth hydraulic cylinders extend downwards and penetrate through an upper pressing steel plate, the lower ends of piston rods of the fourth hydraulic cylinders are fixedly connected with the upper surface of a lower pressing steel plate, a plurality of vertically arranged fifth hydraulic cylinders are fixedly arranged on the upper surface of the upper pressing steel plate, piston rods of the fifth hydraulic cylinders extend upwards, inverted U-shaped supporting rods are fixedly connected at the tops of the piston rods of the fifth hydraulic cylinders, the lower ends of two vertical rods of the inverted U-shaped supporting rods penetrate through the upper pressing steel plate and are fixedly connected with the upper surface of the lower pressing steel plate, and rubber sealing rings are fixedly connected between the four side edges of the lower surface of the upper pressing steel plate and the four side edges of the upper surface of the lower pressing steel plate, the size of the upper pressing steel plate is the same as that of the lower pressing steel plate, the size of the upper port of the test bin is slightly smaller than that of the upper port of the test bin, the upper pressing steel plate, the outer side edges of the lower pressing steel plate and the rubber sealing ring around the test bin have a gap of 0.1-0.5mm with the inner wall of the test bin all around respectively, each detection tube vertically penetrates through the supporting steel plate respectively, the upper pressing steel plate and the lower pressing steel plate are in sealing installation with the supporting steel plate, the lower end of each detection tube is flush with the lower surface of the lower pressing steel plate, each detection tube is fixedly connected with the lower pressing steel plate, each detection tube is in sliding connection with the supporting steel plate and the upper pressing steel plate, and the computer control system is in signal connection with each fourth hydraulic cylinder and each fifth hydraulic cylinder respectively.

The lower surface of the pressing steel plate and the lower surface of the bottom of the test bin are both bonded with a plurality of strain gauges, and the computer control system is in signal connection with the strain gauges respectively.

A plurality of vertical heating rods arranged at intervals are uniformly arranged around the outside of the test chamber, and the computer control system is in signal connection with each vertical heating rod respectively.

A test method for simulating and researching a deep coal bed methane permeability test device specifically comprises the following steps:

(1) manufacturing a simulated underground deep coal seam sample;

(2) sealing and plugging the upper port of the test bin by the pressing plate assembly;

(3) injecting a certain amount of coal bed gas in the coal bed gas storage tank into the test bin through the gas pump, so that the coal bed gas is fully contacted with the underground deep coal bed sample;

(4) the work of lifting assembly, pressing plate assembly and each heating rod is controlled to simulate different down forces and different temperatures, and the influence of different down forces and different temperatures on the permeability of deep coal bed methane is tested through each coal bed methane content sensor.

The step (1) is specifically as follows: firstly, closing a soil switch ball valve and a coal powder switch ball valve initially, supporting the bottom of a lifting bearing plate on the ground through four third support columns, filling soil into a soil bin, filling coal powder into the coal powder bin, respectively taking four cables down from corresponding first hanging rings and second hanging rings, then controlling a piston rod of a second hydraulic cylinder to contract through a computer control system, driving a supporting steel plate to turn backwards and upwards by the second hydraulic cylinder, turning the whole pressing plate assembly backwards and upwards, opening a rectangular feeding port, starting a belt conveyor, opening the soil switch ball valve, discharging soil particles from the soil bin through a soil discharge pipe and dropping on the front side part of the belt conveyor, conveying the soil particles backwards and upwards by the belt conveyor, dropping a certain amount of soil particles into a test bin through the rectangular feeding port to form a soil particle pile, and then closing the soil switch ball valve, the piston rod of the second hydraulic cylinder is controlled to extend out, the second hydraulic cylinder pushes the supporting steel plate to turn forwards and downwards, so that the whole pressing plate assembly turns forwards and downwards until the supporting steel plate is in a horizontal state, the whole pressing plate assembly covers the rectangular feeding port, the front side parts of the two limit length baffles are lapped on the upper part of the front side edge of the rectangular feeding port, the piston rod of each fourth hydraulic cylinder is controlled to synchronously extend downwards, the piston rod of each fourth hydraulic cylinder drives the lower pressing steel plate and the upper pressing steel plate to move downwards together, so that the lower pressing steel plate and the upper pressing steel plate both extend into the test bin, the lower surface of the lower pressing steel plate presses on the soil particle pile in the test bin until the soil particle pile is flattened and compacted, so that a soil layer is formed at the bottom in the test bin, the piston rods of the fourth hydraulic cylinders are controlled to synchronously contract upwards, so that the lower pressing steel plate and the upper pressing steel plate are lifted upwards from the test bin, controlling the piston rod of a second hydraulic cylinder to contract, driving a supporting steel plate to turn backwards and upwards by the second hydraulic cylinder, turning over the whole pressing plate assembly backwards and upwards, opening a rectangular feed opening, opening a pulverized coal switch ball valve, discharging pulverized coal particles from a pulverized coal bin through a pulverized coal discharge pipe and dropping on the front side part of a belt conveyor, conveying the pulverized coal particles backwards and upwards by the belt conveyor, enabling a certain amount of pulverized coal particles to drop into a test bin through the rectangular feed opening to form a pulverized coal particle pile, then closing the pulverized coal switch ball valve, controlling the piston rod of the second hydraulic cylinder to extend out, pushing the supporting steel plate to turn forwards and downwards by the second hydraulic cylinder, turning over the whole pressing plate assembly forwards and downwards until the supporting steel plate is in a horizontal state, covering the rectangular feed opening by the whole pressing plate assembly, lapping the front side parts of two limit length baffles on the upper part of the front side of the rectangular feed opening, and controlling the piston rods of the fourth hydraulic cylinders to synchronously extend out downwards, the piston rod of each fourth hydraulic cylinder drives the lower pressing steel plate and the upper pressing steel plate to move downwards together, so that the lower pressing steel plate and the upper pressing steel plate extend into the test bin, the lower surface of the lower pressing steel plate presses the pulverized coal particle pile in the test bin until the pulverized coal particle pile is flattened and compacted, a coal bed is formed on the soil layer at the bottom in the test bin, then the piston rod of each fourth hydraulic cylinder is controlled to synchronously contract upwards, the lower pressing steel plate and the upper pressing steel plate are lifted upwards from the test bin, the piston rod of the second hydraulic cylinder is controlled to contract, the second hydraulic cylinder drives the supporting steel plate to turn backwards and upwards, so that the whole pressing plate assembly turns backwards and upwards, the rectangular feed opening is opened, the soil switch ball valve is opened, soil particles are discharged from the soil bin through the soil discharge pipe and fall onto the front side part of the belt conveyor, and the belt conveyor conveys the soil particles backwards and upwards, enabling a certain amount of soil particles to fall into a test bin through a rectangular feed opening to form a soil particle pile, then closing a soil switch ball valve, controlling a piston rod of a second hydraulic cylinder to extend out, pushing a supporting steel plate to turn forwards and downwards to enable a whole pressing plate assembly to turn forwards and downwards until the supporting steel plate is in a horizontal state, covering the rectangular feed opening by the whole pressing plate assembly, overlapping the front side parts of two limiting length baffles on the upper part of the front side edge of the rectangular feed opening, controlling the piston rod of each fourth hydraulic cylinder to synchronously extend downwards, driving a lower pressing steel plate and an upper pressing steel plate to move downwards together by the piston rod of each fourth hydraulic cylinder, enabling the lower pressing steel plate and the upper pressing steel plate to extend into the test bin, pressing the lower surface of the lower pressing steel plate on the soil particle pile in the test bin until the soil particle pile is flattened and compacted, and further forming another soil layer on a coal bed in the test bin, therefore, a three-layer structure of a soil layer, a coal bed and a soil layer can be manufactured in the test bin, and the manufacturing of the sample simulating the underground deep coal bed is completed.

The step (2) is specifically as follows: operating the piston rods of the fourth hydraulic cylinders to synchronously contract upwards, lifting the lower pressing steel plate and the upper pressing steel plate upwards from the test chamber, keeping the supporting steel plate, the upper pressing steel plate and the lower pressing steel plate in an initial horizontal state, correspondingly hooking two ends of four cables on corresponding first lifting rings and second lifting rings respectively, correspondingly winding the four cables on the lower parts of corresponding four lifting pulleys respectively, correspondingly suspending the four lifting pulleys by the four cables respectively, operating the two third hydraulic cylinders to synchronously extend the piston rods of the two hydraulic cylinders upwards, pushing the lifting shafts upwards by the piston rods of the two hydraulic cylinders to stably lift, driving two lifting blocks to synchronously move upwards by the two ends of the lifting shafts, driving one ends of the four cables to upwards lift by the two lifting blocks respectively, pulling the four lifting pulleys to upwards move by the four cables respectively, and further lifting the lifting bearing plate upwards, the lifting bearing plate drives each first hydraulic oil cylinder to move upwards together, the bottom of the test bin is fixedly supported at the top of a piston rod of each first hydraulic oil cylinder, each first hydraulic oil cylinder pushes the test bin to move upwards, the test bin slides upwards along two vertical guide rails through a sliding block until an upper pressure steel plate and a lower pressure steel plate both extend into the inner part of an upper port of the test bin, the lower surface of the lower pressure steel plate is tightly pressed on the uppermost soil layer in the test bin, then each fifth hydraulic oil cylinder is controlled to enable the piston rod of each fifth hydraulic oil cylinder to extend upwards, an inverted U-shaped support rod is fixedly connected to the top of the piston rod of the fifth hydraulic oil cylinder, the lower ends of two vertical rods of the inverted U-shaped support rod penetrate through the upper pressure steel plate and are fixedly connected with the upper surface of the lower pressure steel plate, and the cylinder body of each fifth hydraulic oil cylinder can push the upper pressure steel plate downwards to move under the condition that the lower pressure steel plate is kept fixed, the upper pressing steel plate and the lower pressing steel plate extrude the rubber sealing ring to deform the rubber sealing ring, and the periphery of the rubber sealing ring is outwards extruded and is in sealing contact with the periphery of the inner wall of the test bin, so that the upper port of the test bin is sealed and blocked.

The step (3) is specifically as follows: and starting the air pump, and injecting a certain amount of coal bed gas in the coal bed gas storage tank into the test bin through the air injection pipe and the four gas pipelines by the air pump so as to ensure that the coal bed gas is fully contacted with the underground deep coal bed sample.

The step (4) is specifically as follows: after a certain amount of coal bed gas is injected into the test bin, two third hydraulic cylinders are controlled according to the pressure required by the test, piston rods of the two third hydraulic cylinders synchronously extend upwards, two ends of a lifting shaft drive two lifting blocks to lift four cables upwards, the four cables respectively lift four lifting pulleys, a lifting bearing plate is lifted upwards, the test bin is lifted upwards, the lower surface of a pressing steel plate is extruded with the uppermost soil layer in the test bin, a plurality of strain gauges are bonded on the lower surface of the pressing steel plate and the lower surface of the bottom of the test bin, pressure sensors positioned at the tops of the piston rods of the first hydraulic cylinders are arranged at the bottom of the test bin, each first hydraulic cylinder and each fourth hydraulic cylinder are regulated and controlled according to the data of each strain gauge and the data of each pressure sensor, so that the pressure of each part of a sample in the lower deep coal bed in the test bin is regulated, simulate different ground pressure, open each heating rod simultaneously according to experimental needs and heat the test storehouse, simulate different temperatures, each coal bed gas content sensor surveys the change of the interior coal bed gas content of test storehouse, and then the test obtains different ground pressure and different temperatures to the influence of deep coal bed gas permeability.

Compared with the prior art, the method has outstanding substantive characteristics and remarkable progress, and particularly can simulate and test the permeability of the underground coal bed structure under different underground pressures and different temperatures, judge whether the underground coal bed structure under different underground pressures and different temperatures has the possibility of containing the coal bed gas or not according to the measured permeability of the coal bed gas, and can carry out remote survey without carrying out field test.

Drawings

Fig. 1 is a schematic structural view of the present invention.

Fig. 2 is a top view of the present invention.

Fig. 3 is a first working schematic diagram of the invention.

Fig. 4 is a second working schematic diagram of the present invention.

Fig. 5 is a third working schematic diagram of the present invention.

FIG. 6 is a schematic diagram of the construction of the platen assembly of the present invention.

Fig. 7 is a partially enlarged view of a portion a in fig. 1.

Fig. 8 is a partially enlarged view of fig. 1 at B.

Detailed Description

The embodiments of the present invention are further described below with reference to the drawings.

As shown in fig. 1-8, a test device for simulating and researching permeability of deep coal bed gas comprises a material bin, a belt conveyor 1, a test bin 2, a test platform 3, a lifting mechanism, a lifting bearing plate 4, a plurality of first hydraulic oil cylinders 5, an air pump 6, a coal bed gas storage tank, a plurality of coal bed gas content sensors 8 and a computer control system, wherein the material bin, the belt conveyor 1 and the test bin 2 are sequentially arranged from front to back;

the material bin is fixedly supported on the ground through four first supporting columns 9, the test platform 3 is horizontally arranged right above the test bin 2, the test bin 2 is a rectangular box body with an open top, the periphery of the bottom of the test platform 3 is fixedly supported on the ground through four second supporting columns 10 and is positioned on the rear side of the belt conveyor 1, the middle part of the test platform 3 is provided with a rectangular feeding port 11 which is through from top to bottom and is positioned right above the test bin 2, the middle part in the material bin is fixedly provided with a vertical partition plate 12 along the front-back direction, the vertical partition plate 12 divides the interior of the material bin into a soil bin 13 and a pulverized coal bin 14 from left to right, the bottom of the rear side of the material bin is provided with a soil discharge pipe 15 and a pulverized coal discharge pipe 16 at left and right intervals, the front end of the soil discharge pipe 15 is communicated with the interior of the soil bin 13, the front end of the pulverized coal discharge pipe 16 is communicated with the interior of the pulverized coal bin 14, the belt conveyor 1 is arranged along the front-back direction and is low and high in front-back direction, the belt conveyor 1 conveys materials from front to back, the front end of the belt conveyor 1 is a material receiving end, the rear end of the belt conveyor 1 is a material output end, the bottom of the front end of the belt conveyor 1 is fixedly supported on the ground, the bottom of the rear end of the belt conveyor 1 is fixedly supported in the middle of the front side of the test platform 3, the rear ends of a soil discharge pipe 15 and a pulverized coal discharge pipe 16 are correspondingly arranged above the front end of the belt conveyor 1, a soil switch ball valve 17 is arranged on the soil discharge pipe 15, a pulverized coal switch ball valve 18 is arranged on the pulverized coal discharge pipe 16, the rear end of the belt conveyor 1 is positioned on the front side above the rectangular feed opening 11, a pressure plate assembly covering the rectangular feed opening 11 is rotatably arranged on the rear side edge of the rectangular feed opening 11, the lower part of the pressure plate assembly correspondingly plugs the upper port of the test bin 2, a plurality of detection pipes 19 vertically penetrating through the pressure plate assembly are arranged on the pressure plate assembly, the lower end of the detection tube 19 is flush with the bottom of the pressing plate component, the upper end of the detection tube 19 is positioned at the upper side of the pressing plate component, each coal bed gas content sensor 8 is respectively and correspondingly installed at the upper end of each detection tube 19, the middle part of the rear side of the test platform 3 is fixedly provided with a vertical support plate 20, a second hydraulic cylinder 21 is hinged between the upper part of the front side of the vertical support plate 20 and the middle part of the top surface of the pressing plate component, a vertical guide rail 22 is respectively and fixedly connected between the front side and the rear side of the bottom of the test platform 3 and the ground, the vertical guide rail 22 at the front side is positioned at the front side of the test chamber 2, the vertical guide rail 22 at the rear side is positioned at the rear side of the test chamber 2, the front side and the rear side of the test chamber 2 are respectively and slidably connected with the front and rear vertical guide rails 22 through a slide block 23, the lifting mechanism is fixedly installed on the test platform 3, the lifting bearing plate 4 is arranged below the test chamber 2, each first hydraulic cylinder 5 is respectively and vertically and fixedly installed on the lifting bearing plate 4 and is arranged in a plurality of rows in a matrix form, the bottom fixed stay of experimental storehouse 2 is at the piston rod top of each first hydraulic cylinder 5, the bottom of experimental storehouse 2 is provided with the pressure sensor 24 that is located the piston rod top of each first hydraulic cylinder 5, hoist mechanism is connected around with promotion loading board 4, four side middle parts of experimental storehouse 2 all are connected with a gas pipeline, four gas pipeline's air inlet is connected with the coal bed gas storage tank through a gas injection pipe 25, air pump 6 sets up on gas injection pipe 25, computer control system respectively with band conveyer 1, hoist mechanism, each first hydraulic cylinder 5, air pump 6, each coal bed gas content sensor 8, second hydraulic cylinder 21 and each pressure sensor 24 signal connection.

The lifting mechanism comprises two third hydraulic oil cylinders 26, a lifting shaft 27 and two sets of cable assemblies, wherein the two third hydraulic oil cylinders 26 are vertically arranged, the two third hydraulic oil cylinders 26 are bilaterally and symmetrically fixedly installed in the middle parts of the left side and the right side of the pressing plate assembly, the top parts of piston rods of the two third hydraulic oil cylinders 26 are respectively provided with an ear seat 28, a central hole of each ear seat 28 is horizontally arranged along the left and right direction, the lifting shaft 27 is horizontally arranged along the left and right direction and correspondingly penetrates through the central holes hinged in the two ear seats 28, the left end of the lifting shaft 27 is positioned on the left side above the left side of the test platform 3, the right end of the lifting shaft 27 is positioned on the right side above the right side of the test platform 3, and the two sets of cable assemblies are identical in structure and are bilaterally and symmetrically arranged at the left and right ends of the lifting shaft 27;

the left cable assembly comprises a lifting block 29, two cables 30 and two lifting pulleys 31, the lifting block 29 is fixedly arranged at the left end of a lifting shaft 27, the plane where the lifting block 29 is located is vertically arranged along the front-back direction, the lifting block 29 is in an inverted V-shaped structure, two corners of the lower side of the lifting block 29 are fixedly provided with first lifting rings 32, the two lifting pulleys 31 are respectively and symmetrically arranged at the front side and the rear side of the left side of the lifting bearing plate 4 in a front-back rotating mode, the central shaft of the lifting pulley 31 is horizontally arranged along the left-right direction, the front side and the rear side of the left side of the test platform 3 are respectively and fixedly provided with second lifting rings 33, the vertical projection of the lifting pulley 31 at the front side is positioned between the vertical projection of the first lifting ring 32 at the front side and the vertical projection of the second lifting ring 33 at the front side, the vertical projection of the lifting pulley 31 at the rear side is positioned between the vertical projection of the first lifting ring 32 at the rear side and the second lifting ring 33 at the rear side, two cables 30 are symmetrically arranged front and back, one end of the front cable 30 is hooked on a first hanging ring 32 on the front side, the other end of the front cable 30 bypasses a lifting pulley 31 on the front side and is hooked on a second hanging ring 33 on the front side, one end of the rear cable 30 is hooked on the first hanging ring 32 on the rear side, the other end of the rear cable 30 bypasses the lifting pulley 31 on the rear side and is hooked on the second hanging ring 33 on the rear side, third pillars 7 are fixedly installed on the periphery of the bottom of the lifting bearing plate 4, and the computer control system is respectively in signal connection with the two third hydraulic cylinders 26.

The pressing plate component comprises a supporting steel plate 34, an upper pressing steel plate 35 and a lower pressing steel plate 36, the supporting steel plate 34, the upper pressing steel plate 35 and the lower pressing steel plate 36 are sequentially arranged from top to bottom at intervals, are of rectangular plate structures and are positioned right above an upper port of the test chamber 2, the length of the front side of the supporting steel plate 34 is the same as that of the front side of the rectangular feeding port 11, the length of the left side of the supporting steel plate 34 is smaller than that of the left side of the rectangular feeding port 11, the rear side of the supporting steel plate 34 is hinged to a rear side test platform 3 of the rectangular feeding port 11 through a plurality of hinges 37, limit long baffles 38 are fixedly arranged on the left side and the right side of the front side of the supporting steel plate 34, the length direction of the limit long baffles 38 is arranged along the front-back direction, the front side of the limit long baffles 38 is lapped on the upper portion of the front side of the rectangular feeding port 11, the bottom of the cylinder body of the second hydraulic cylinder 21 is hinged to the middle portion of the upper surface of the supporting steel plate 34, the top of a piston rod of a second hydraulic cylinder 21 is hinged on the upper part of the front side of the vertical support plate 20, a hinged shaft at the bottom of a cylinder body of the second hydraulic cylinder 21 and a hinged shaft at the top of the piston rod of the second hydraulic cylinder 21 are horizontally arranged along the left-right direction, two third hydraulic cylinders 26 are fixedly arranged in the middle of the left side and the middle of the right side of the upper surface of the support steel plate 34 in a bilateral symmetry manner, a plurality of vertically arranged fourth hydraulic cylinders 39 are arranged on the lower surface of the support steel plate 34, piston rods of the fourth hydraulic cylinders 39 extend downwards and penetrate through the upper press steel plate 35, the lower ends of the piston rods of the fourth hydraulic cylinders 39 are fixedly connected with the upper surface of the lower press steel plate 36, a plurality of vertically arranged fifth hydraulic cylinders 40 are fixedly arranged on the upper surface of the upper press steel plate 35, piston rods of the fifth hydraulic cylinders 40 extend upwards, and inverted U-shaped support rods 41 are fixedly connected with the tops of the piston rods of the fifth hydraulic cylinders 40, the lower ends of two vertical rods of the inverted U-shaped support rod 41 penetrate through the upper steel pressing plate 35 and are fixedly connected with the upper surface of the lower steel pressing plate 36, rubber sealing rings 42 are fixedly connected between the four sides of the lower surface of the upper steel pressing plate 35 and the four sides of the upper surface of the lower steel pressing plate 36, the sizes of the upper steel pressing plate 35 and the lower steel pressing plate 36 are the same and are slightly smaller than the size of an upper port of the test bin 2, gaps of 0.1-0.5mm are respectively formed between the peripheral outer sides of the upper steel pressing plate 35, the lower steel pressing plate 36 and the periphery of the inner wall of the test bin 2, each detection tube 19 vertically penetrates through the support steel plate 34, the upper steel pressing plate 35 and the lower steel pressing plate 36 and is hermetically mounted with the support steel plate 34, the upper steel pressing plate 35 and the lower steel pressing plate 36, the lower end of each detection tube 19 is flush with the lower surface of the lower steel pressing plate 36, each detection tube 19 is fixedly connected with the support steel pressing plate 34 and the upper steel pressing plate 35 in a sliding manner, the computer control system is in signal connection with each fourth hydraulic ram 39 and each fifth hydraulic ram 40 respectively.

The lower surface of the pressing steel plate 36 and the lower surface of the bottom of the test chamber 2 are both bonded with a plurality of strain gauges, and the computer control system is respectively in signal connection with the strain gauges.

A plurality of vertical heating rods 43 arranged at intervals are uniformly arranged around the outside of the test chamber 2, and the computer control system is respectively in signal connection with each vertical heating rod 43.

The coalbed methane storage tank, the computer control system and the strain gauge are not shown in the figure.

(1) manufacturing a simulated underground deep coal seam sample;

(2) sealing and plugging the upper port of the test chamber 2 by the pressing plate assembly;

(3) injecting a certain amount of coal bed gas in the coal bed gas storage tank into the test bin 2 through the gas pump 6, so that the coal bed gas is fully contacted with the underground deep coal bed sample;

(4) through the work of control lifting assembly, clamp plate subassembly and each heating rod, simulate different time pressure and different temperatures, through the influence of different time pressure and different temperatures to deep coal bed gas permeability of each coal bed gas content sensor 8 test different time pressure and different temperatures.

The step (1) is specifically as follows: firstly, closing a soil switch ball valve 17 and a coal powder switch ball valve 18 at the beginning, supporting the bottom of a lifting bearing plate 4 on the ground through four third struts 7, filling soil into a soil bin 13, filling coal powder into a coal powder bin 14, respectively taking down four cables 30 from corresponding first hanging rings 32 and second hanging rings 33, then controlling a piston rod of a second hydraulic cylinder 21 to shrink through a computer control system, driving a supporting steel plate 34 to turn backwards and upwards by the second hydraulic cylinder 21, turning over the whole pressing plate assembly backwards and upwards, opening a rectangular feeding port 11, starting a belt conveyor 1, opening the soil switch ball valve 17, discharging soil particles from the soil bin 13 through a soil discharge pipe 15 and dropping on the front side part of the belt conveyor 1, conveying the soil particles backwards and upwards by the belt conveyor 1, dropping a certain amount of soil particles into a test bin 2 through the rectangular feeding port 11 to form a soil particle pile, then closing the soil switch ball valve 17, controlling a piston rod of a second hydraulic cylinder 21 to extend out, pushing a supporting steel plate 34 to turn forwards and downwards by the second hydraulic cylinder 21, enabling a pressing plate assembly to turn forwards and downwards integrally until the supporting steel plate 34 is in a horizontal state, covering a rectangular feeding port 11 by the pressing plate assembly integrally, overlapping the front side parts of two long limiting baffles 38 on the upper part of the front side edge of the rectangular feeding port 11, controlling the piston rod of each fourth hydraulic cylinder 39 to extend downwards synchronously, driving a pressing steel plate 36 and an upper pressing steel plate 35 to move downwards together by the piston rod of each fourth hydraulic cylinder 39, enabling the pressing steel plate 36 and the upper pressing steel plate 35 to extend into the test chamber 2, pressing the lower surface of the pressing steel plate 36 on the soil particles in the test chamber 2 until the soil particles are pressed and compacted, forming a soil layer at the bottom in the test chamber 2, controlling the piston rod of each fourth hydraulic cylinder 39 to contract upwards synchronously, lifting a lower pressing steel plate 36 and an upper pressing steel plate 35 upwards from a test chamber 2, controlling a piston rod of a second hydraulic cylinder 21 to contract, driving a supporting steel plate 34 to turn backwards and upwards by the second hydraulic cylinder 21, turning the whole pressing plate assembly backwards and upwards, opening a rectangular feeding port 11, opening a coal powder switch ball valve 18, discharging coal powder particles from a coal powder chamber 14 through a coal powder discharge pipe 16 and dropping on the front side part of a belt conveyor 1, conveying the coal powder particles upwards backwards by the belt conveyor 1, dropping a certain amount of coal powder particles into the test chamber 2 through the rectangular feeding port 11 to form a coal powder particle pile, closing the coal powder switch ball valve 18, controlling the piston rod of the second hydraulic cylinder 21 to extend, driving the supporting steel plate 34 to turn forwards and downwards by the second hydraulic cylinder 21, turning the whole pressing plate assembly forwards and downwards until the supporting steel plate 34 is in a horizontal state, covering the rectangular feeding port 11 by the whole pressing plate assembly, the front side parts of the two limit long baffles 38 are lapped on the upper part of the front side edge of the rectangular feeding port 11, the piston rods of the fourth hydraulic cylinders 39 are controlled to synchronously extend downwards, the piston rods of the fourth hydraulic cylinders 39 drive the lower pressing steel plate 36 and the upper pressing steel plate 35 to move downwards together, so that the lower pressing steel plate 36 and the upper pressing steel plate 35 both extend into the test bin 2, the lower surface of the lower pressing steel plate 36 presses on the coal powder particle pile in the test bin 2 until the coal powder particle pile is flattened and compacted, a coal bed is formed on a soil layer at the bottom in the test bin 2, then the piston rods of the fourth hydraulic cylinders 39 are controlled to synchronously contract upwards, the lower pressing steel plate 36 and the upper pressing steel plate 35 are lifted upwards from the test bin 2, the piston rods of the second hydraulic cylinders 21 are controlled to contract, the second hydraulic cylinders 21 drive the supporting steel plates 34 to overturn upwards backwards, and the whole pressing plate assembly overturns upwards backwards, opening the rectangular feeding port 11, opening the soil switch ball valve 17, discharging soil particles from the soil bin 13 through the soil discharge pipe 15 and dropping on the front side part of the belt conveyor 1, conveying the soil particles upwards backwards through the belt conveyor 1, enabling a certain amount of soil particles to drop into the test bin 2 through the rectangular feeding port 11 to form a soil particle pile, then closing the soil switch ball valve 17, controlling the piston rod of the second hydraulic cylinder 21 to extend out, pushing the supporting steel plate 34 to turn forwards and downwards by the second hydraulic cylinder 21, enabling the whole pressing plate assembly to turn forwards and downwards until the supporting steel plate 34 is in a horizontal state, covering the rectangular feeding port 11 by the whole pressing plate assembly, overlapping the front side parts of the two limiting long baffles 38 on the upper part of the front side edge of the rectangular feeding port 11, controlling the piston rods of the fourth hydraulic cylinders 39 to synchronously extend downwards, driving the lower pressing steel plate 36 and the upper pressing steel plate 35 to move downwards by the piston rods of the fourth hydraulic cylinders 39, the lower pressing steel plate 36 and the upper pressing steel plate 35 extend into the test chamber 2, the lower surface of the lower pressing steel plate 36 is pressed on the soil particles in the test chamber 2 until the soil particles are pressed, pressed and compacted, and therefore another soil layer is formed on the coal bed in the test chamber 2, so that a three-layer structure of the soil layer, the coal bed and the soil layer can be manufactured in the test chamber 2, and the simulation of underground deep coal bed samples is completed.

The step (2) is specifically as follows: the piston rods of the fourth hydraulic cylinders 39 are controlled to synchronously contract upwards, the lower pressing steel plate 36 and the upper pressing steel plate 35 are lifted upwards from the test chamber 2, the supporting steel plate 34, the upper pressing steel plate 35 and the lower pressing steel plate 36 are kept in an initial horizontal state, two ends of four cables 30 are correspondingly hooked on the corresponding first lifting ring 32 and the second lifting ring 33 respectively, the four cables 30 are correspondingly wound on the lower parts of the corresponding four lifting pulleys 31 respectively, the four cables 30 correspondingly suspend the four lifting pulleys 31 respectively, then two third hydraulic cylinders 26 are controlled to synchronously extend the piston rods of the two hydraulic cylinders upwards, the piston rods of the two hydraulic cylinders upwards push the lifting shafts 27 to be stably lifted, two ends of the shafts 27 drive the two lifting blocks 29 to synchronously move upwards, the two lifting blocks 29 respectively drive one ends of the four cables 30 to upwards lift, and the four cables 30 correspondingly pull the four lifting pulleys 31 to upwards respectively, further, the lifting bearing plate 4 is lifted upwards, the lifting bearing plate 4 drives each first hydraulic oil cylinder 5 to move upwards together, the bottom of the test bin 2 is fixedly supported on the top of the piston rod of each first hydraulic oil cylinder 5, each first hydraulic oil cylinder 5 pushes the test bin 2 to move upwards, the test bin 2 slides upwards along the two vertical guide rails 22 through the sliding block 23 until the upper pressing steel plate 35 and the lower pressing steel plate 36 both extend into the inner part of the upper port of the test bin 2 and the lower surface of the lower pressing steel plate 36 is tightly pressed on the uppermost soil layer in the test bin 2, then each fifth hydraulic oil cylinder 40 is controlled to enable the piston rod of each fifth hydraulic oil cylinder 40 to extend upwards, the top of the piston rod of the fifth hydraulic oil cylinder 40 is fixedly connected with the inverted U-shaped supporting rod 41, the lower ends of the two vertical rods of the inverted U-shaped supporting rod 41 penetrate through the upper pressing steel plate 35 and are fixedly connected with the upper surface of the lower pressing steel plate 36, under the condition that the lower pressing steel plate 36 is kept fixed, the cylinder body of each fifth hydraulic cylinder 40 can push the upper pressing steel plate 35 downwards to move, the upper pressing steel plate 35 and the lower pressing steel plate 36 extrude the rubber sealing ring 42, so that the rubber sealing ring 42 deforms, the periphery of the rubber sealing ring 42 is extruded outwards and is in sealing contact with the periphery of the inner wall of the test bin 2, and therefore the upper port of the test bin 2 is sealed and blocked.

The step (3) is specifically as follows: and starting the air pump 6, and injecting a certain amount of coal bed gas in the coal bed gas storage tank into the test bin 2 through the air injection pipe 25 and the four gas pipelines by the air pump 6 so as to ensure that the coal bed gas is fully contacted with the underground deep coal bed sample.

The step (4) is specifically as follows: after a certain amount of coal bed gas is injected into the test chamber 2, according to the pressure required by the test, two third hydraulic cylinders 26 are controlled to enable piston rods of the two third hydraulic cylinders 26 to synchronously extend upwards, two ends of a lifting shaft 27 drive two lifting blocks 29 to lift four cables 30 upwards, the four cables 30 respectively lift four lifting pulleys 31, a lifting bearing plate 4 is lifted upwards, and then the test chamber 2 is lifted, so that the lower surface of a lower pressing steel plate 36 is extruded with the uppermost soil layer in the test chamber 2, because a plurality of strain gauges are bonded on the lower surface of the lower pressing steel plate 36 and the lower surface of the bottom of the test chamber 2, the bottom of the test chamber 2 is provided with a pressure sensor 24 positioned at the top of the piston rod of each first hydraulic cylinder 5, and each fourth hydraulic cylinder 39 are regulated and controlled according to the data of each strain gauge and the data of each pressure sensor 24, the realization is adjusted each department pressure of underground deep coal seam sample in experimental storehouse 2, simulates different ground pressure, opens each heating rod simultaneously according to experimental needs and heats experimental storehouse 2, simulates different temperatures, and each coal bed gas content sensor 8 records the change of coal bed gas content in experimental storehouse 2, and then the test obtains different ground pressure and different temperatures to the influence of deep coal bed gas permeability.

The method can simulate and test the permeability of the underground coal bed structure under different underground pressures and different temperatures, judge whether the underground coal bed structure under different underground pressures and different temperatures has the possibility of containing the coal bed gas or not according to the measured permeability of the coal bed gas, and does not need to carry out field test.

The above embodiments are merely to illustrate rather than to limit the technical solutions of the present invention, and although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that; modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.

Claims

1. The utility model provides a simulation research deep coal bed gas permeability test device which characterized in that: the device comprises a material bin, a belt conveyor, a test bin, a test platform, a lifting mechanism, a lifting bearing plate, a plurality of first hydraulic oil cylinders, an air pump, a coal bed gas storage tank, a plurality of coal bed gas content sensors and a computer control system, wherein the material bin, the belt conveyor and the test bin are sequentially arranged from front to back;

2. The device for simulating and researching deep coal bed methane permeability according to claim 1, is characterized in that: the lifting mechanism comprises two third hydraulic oil cylinders, a lifting shaft and two sets of cable assemblies, wherein the two third hydraulic oil cylinders are vertically arranged, the two third hydraulic oil cylinders are bilaterally and fixedly arranged in the middle parts of the left side and the right side of the pressing plate assembly, the tops of piston rods of the two third hydraulic oil cylinders are respectively provided with an ear seat, a central hole of each ear seat is horizontally arranged along the left and right direction, the lifting shaft is horizontally arranged along the left and right direction and correspondingly penetrates through the central holes hinged to the two ear seats, the left end of the lifting shaft is positioned on the left side above the left side of the test platform, the right end of the lifting shaft is positioned on the right side above the right side of the test platform, and the two sets of cable assemblies are identical in structure and are bilaterally and symmetrically arranged at the left and right ends of the lifting shaft;

3. The device for simulating and researching deep coal bed methane permeability according to claim 2, is characterized in that: the pressing plate component comprises a supporting steel plate, an upper pressing steel plate and a lower pressing steel plate, the supporting steel plate, the upper pressing steel plate and the lower pressing steel plate are sequentially arranged at intervals from top to bottom and are of rectangular plate structures and are positioned right above an upper port of the test chamber, the length of the front side edge of the supporting steel plate is the same as that of the front side edge of the rectangular feed opening, the length of the left side edge of the supporting steel plate is smaller than that of the left side edge of the rectangular feed opening, the rear side edge of the supporting steel plate is hinged to a rear side edge test platform of the rectangular feed opening through a plurality of hinges, limit long baffles are fixedly arranged on the left side portion and the right side portion of the front side edge of the supporting steel plate, the length direction of each limit long baffle is arranged along the front-back direction, the front side portion of each limit long baffle is lapped on the upper portion of the front side edge of the rectangular feed opening, the bottom of a cylinder body of the second hydraulic cylinder is hinged to the middle portion of the upper surface of the supporting steel plate, the top of a piston rod of the second hydraulic cylinder is hinged to the upper portion of the front side of the vertical support plate, a hinged shaft at the bottom of a cylinder body of the second hydraulic cylinder and a hinged shaft at the top of a piston rod of the second hydraulic cylinder are horizontally arranged along the left-right direction, two third hydraulic cylinders are bilaterally and symmetrically fixedly arranged at the middle parts of the left side and the right side of the upper surface of a supporting steel plate, a plurality of vertically arranged fourth hydraulic cylinders are arranged on the lower surface of the supporting steel plate, piston rods of the fourth hydraulic cylinders extend downwards and penetrate through an upper pressing steel plate, the lower ends of piston rods of the fourth hydraulic cylinders are fixedly connected with the upper surface of a lower pressing steel plate, a plurality of vertically arranged fifth hydraulic cylinders are fixedly arranged on the upper surface of the upper pressing steel plate, piston rods of the fifth hydraulic cylinders extend upwards, inverted U-shaped supporting rods are fixedly connected at the tops of the piston rods of the fifth hydraulic cylinders, the lower ends of two vertical rods of the inverted U-shaped supporting rods penetrate through the upper pressing steel plate and are fixedly connected with the upper surface of the lower pressing steel plate, and rubber sealing rings are fixedly connected between the four side edges of the lower surface of the upper pressing steel plate and the four side edges of the upper surface of the lower pressing steel plate, the size of the upper pressing steel plate is the same as that of the lower pressing steel plate, the size of the upper port of the test bin is slightly smaller than that of the upper port of the test bin, the upper pressing steel plate, the outer side edges of the lower pressing steel plate and the rubber sealing ring around the test bin have a gap of 0.1-0.5mm with the inner wall of the test bin all around respectively, each detection tube vertically penetrates through the supporting steel plate respectively, the upper pressing steel plate and the lower pressing steel plate are in sealing installation with the supporting steel plate, the lower end of each detection tube is flush with the lower surface of the lower pressing steel plate, each detection tube is fixedly connected with the lower pressing steel plate, each detection tube is in sliding connection with the supporting steel plate and the upper pressing steel plate, and the computer control system is in signal connection with each fourth hydraulic cylinder and each fifth hydraulic cylinder respectively.

4. The simulated deep coal bed methane research device according to claim 3, characterized in that: the lower surface of the pressing steel plate and the lower surface of the bottom of the test bin are both bonded with a plurality of strain gauges, and the computer control system is in signal connection with the strain gauges respectively.

5. The simulated deep coal bed methane research device according to claim 4, characterized in that: a plurality of vertical heating rods arranged at intervals are uniformly arranged around the outside of the test chamber, and the computer control system is in signal connection with each vertical heating rod respectively.

6. The test method for simulating the deep coal bed methane permeability test device according to claim 5, wherein the test method comprises the following steps: the method specifically comprises the following steps:

(1) manufacturing a simulated underground deep coal seam sample;

7. The test method for simulating the deep coal bed methane permeability test device according to claim 6, wherein the test method comprises the following steps: the step (1) is specifically as follows: firstly, closing a soil switch ball valve and a coal powder switch ball valve initially, supporting the bottom of a lifting bearing plate on the ground through four third support columns, filling soil into a soil bin, filling coal powder into the coal powder bin, respectively taking four cables down from corresponding first hanging rings and second hanging rings, then controlling a piston rod of a second hydraulic cylinder to contract through a computer control system, driving a supporting steel plate to turn backwards and upwards by the second hydraulic cylinder, turning the whole pressing plate assembly backwards and upwards, opening a rectangular feeding port, starting a belt conveyor, opening the soil switch ball valve, discharging soil particles from the soil bin through a soil discharge pipe and dropping on the front side part of the belt conveyor, conveying the soil particles backwards and upwards by the belt conveyor, dropping a certain amount of soil particles into a test bin through the rectangular feeding port to form a soil particle pile, and then closing the soil switch ball valve, the piston rod of the second hydraulic cylinder is controlled to extend out, the second hydraulic cylinder pushes the supporting steel plate to turn forwards and downwards, so that the whole pressing plate assembly turns forwards and downwards until the supporting steel plate is in a horizontal state, the whole pressing plate assembly covers the rectangular feeding port, the front side parts of the two limit length baffles are lapped on the upper part of the front side edge of the rectangular feeding port, the piston rod of each fourth hydraulic cylinder is controlled to synchronously extend downwards, the piston rod of each fourth hydraulic cylinder drives the lower pressing steel plate and the upper pressing steel plate to move downwards together, so that the lower pressing steel plate and the upper pressing steel plate both extend into the test bin, the lower surface of the lower pressing steel plate presses on the soil particle pile in the test bin until the soil particle pile is flattened and compacted, so that a soil layer is formed at the bottom in the test bin, the piston rods of the fourth hydraulic cylinders are controlled to synchronously contract upwards, so that the lower pressing steel plate and the upper pressing steel plate are lifted upwards from the test bin, controlling the piston rod of a second hydraulic cylinder to contract, driving a supporting steel plate to turn backwards and upwards by the second hydraulic cylinder, turning over the whole pressing plate assembly backwards and upwards, opening a rectangular feed opening, opening a pulverized coal switch ball valve, discharging pulverized coal particles from a pulverized coal bin through a pulverized coal discharge pipe and dropping on the front side part of a belt conveyor, conveying the pulverized coal particles backwards and upwards by the belt conveyor, enabling a certain amount of pulverized coal particles to drop into a test bin through the rectangular feed opening to form a pulverized coal particle pile, then closing the pulverized coal switch ball valve, controlling the piston rod of the second hydraulic cylinder to extend out, pushing the supporting steel plate to turn forwards and downwards by the second hydraulic cylinder, turning over the whole pressing plate assembly forwards and downwards until the supporting steel plate is in a horizontal state, covering the rectangular feed opening by the whole pressing plate assembly, lapping the front side parts of two limit length baffles on the upper part of the front side of the rectangular feed opening, and controlling the piston rods of the fourth hydraulic cylinders to synchronously extend out downwards, the piston rod of each fourth hydraulic cylinder drives the lower pressing steel plate and the upper pressing steel plate to move downwards together, so that the lower pressing steel plate and the upper pressing steel plate extend into the test bin, the lower surface of the lower pressing steel plate presses the pulverized coal particle pile in the test bin until the pulverized coal particle pile is flattened and compacted, a coal bed is formed on the soil layer at the bottom in the test bin, then the piston rod of each fourth hydraulic cylinder is controlled to synchronously contract upwards, the lower pressing steel plate and the upper pressing steel plate are lifted upwards from the test bin, the piston rod of the second hydraulic cylinder is controlled to contract, the second hydraulic cylinder drives the supporting steel plate to turn backwards and upwards, so that the whole pressing plate assembly turns backwards and upwards, the rectangular feed opening is opened, the soil switch ball valve is opened, soil particles are discharged from the soil bin through the soil discharge pipe and fall onto the front side part of the belt conveyor, and the belt conveyor conveys the soil particles backwards and upwards, enabling a certain amount of soil particles to fall into a test bin through a rectangular feed opening to form a soil particle pile, then closing a soil switch ball valve, controlling a piston rod of a second hydraulic cylinder to extend out, pushing a supporting steel plate to turn forwards and downwards to enable a whole pressing plate assembly to turn forwards and downwards until the supporting steel plate is in a horizontal state, covering the rectangular feed opening by the whole pressing plate assembly, overlapping the front side parts of two limiting length baffles on the upper part of the front side edge of the rectangular feed opening, controlling the piston rod of each fourth hydraulic cylinder to synchronously extend downwards, driving a lower pressing steel plate and an upper pressing steel plate to move downwards together by the piston rod of each fourth hydraulic cylinder, enabling the lower pressing steel plate and the upper pressing steel plate to extend into the test bin, pressing the lower surface of the lower pressing steel plate on the soil particle pile in the test bin until the soil particle pile is flattened and compacted, and further forming another soil layer on a coal bed in the test bin, therefore, a three-layer structure of a soil layer, a coal bed and a soil layer can be manufactured in the test bin, and the manufacturing of the sample simulating the underground deep coal bed is completed.

8. The test method for simulating the deep coal bed methane permeability test device according to claim 7, wherein the test method comprises the following steps: the step (2) is specifically as follows: operating the piston rods of the fourth hydraulic cylinders to synchronously contract upwards, lifting the lower pressing steel plate and the upper pressing steel plate upwards from the test chamber, keeping the supporting steel plate, the upper pressing steel plate and the lower pressing steel plate in an initial horizontal state, correspondingly hooking two ends of four cables on corresponding first lifting rings and second lifting rings respectively, correspondingly winding the four cables on the lower parts of corresponding four lifting pulleys respectively, correspondingly suspending the four lifting pulleys by the four cables respectively, operating the two third hydraulic cylinders to synchronously extend the piston rods of the two hydraulic cylinders upwards, pushing the lifting shafts upwards by the piston rods of the two hydraulic cylinders to stably lift, driving two lifting blocks to synchronously move upwards by the two ends of the lifting shafts, driving one ends of the four cables to upwards lift by the two lifting blocks respectively, pulling the four lifting pulleys to upwards move by the four cables respectively, and further lifting the lifting bearing plate upwards, the lifting bearing plate drives each first hydraulic oil cylinder to move upwards together, the bottom of the test bin is fixedly supported at the top of a piston rod of each first hydraulic oil cylinder, each first hydraulic oil cylinder pushes the test bin to move upwards, the test bin slides upwards along two vertical guide rails through a sliding block until an upper pressure steel plate and a lower pressure steel plate both extend into the inner part of an upper port of the test bin, the lower surface of the lower pressure steel plate is tightly pressed on the uppermost soil layer in the test bin, then each fifth hydraulic oil cylinder is controlled to enable the piston rod of each fifth hydraulic oil cylinder to extend upwards, an inverted U-shaped support rod is fixedly connected to the top of the piston rod of the fifth hydraulic oil cylinder, the lower ends of two vertical rods of the inverted U-shaped support rod penetrate through the upper pressure steel plate and are fixedly connected with the upper surface of the lower pressure steel plate, and the cylinder body of each fifth hydraulic oil cylinder can push the upper pressure steel plate downwards to move under the condition that the lower pressure steel plate is kept fixed, the upper pressing steel plate and the lower pressing steel plate extrude the rubber sealing ring to deform the rubber sealing ring, and the periphery of the rubber sealing ring is outwards extruded and is in sealing contact with the periphery of the inner wall of the test bin, so that the upper port of the test bin is sealed and blocked.

9. The test method for simulating the deep coal bed methane permeability test device according to claim 8, wherein the test method comprises the following steps: the step (3) is specifically as follows: and starting the air pump, and injecting a certain amount of coal bed gas in the coal bed gas storage tank into the test bin through the air injection pipe and the four gas pipelines by the air pump so as to ensure that the coal bed gas is fully contacted with the underground deep coal bed sample.

10. The test method for simulating the deep coal bed methane permeability test device according to claim 9, wherein the test method comprises the following steps: the step (4) is specifically as follows: after a certain amount of coal bed gas is injected into the test bin, two third hydraulic cylinders are controlled according to the pressure required by the test, piston rods of the two third hydraulic cylinders synchronously extend upwards, two ends of a lifting shaft drive two lifting blocks to lift four cables upwards, the four cables respectively lift four lifting pulleys, a lifting bearing plate is lifted upwards, the test bin is lifted upwards, the lower surface of a pressing steel plate is extruded with the uppermost soil layer in the test bin, a plurality of strain gauges are bonded on the lower surface of the pressing steel plate and the lower surface of the bottom of the test bin, pressure sensors positioned at the tops of the piston rods of the first hydraulic cylinders are arranged at the bottom of the test bin, each first hydraulic cylinder and each fourth hydraulic cylinder are regulated and controlled according to the data of each strain gauge and the data of each pressure sensor, so that the pressure of each part of a sample in the lower deep coal bed in the test bin is regulated, the simulation is different ground down pressure, opens each heating rod simultaneously according to experimental needs and heats the test storehouse, simulates different temperatures, and the change of coal bed gas content in the test storehouse is measured to each coal bed gas content sensor, and then the test obtains different ground down pressure and different temperatures to the influence of deep coal bed gas permeability to judge whether the coal bed gas satisfies the mining requirement under the corresponding geological conditions according to the permeability.