CN118098062A

CN118098062A - A analogue simulation experiment device for simulating coal seam exploitation and filling

Info

Publication number: CN118098062A
Application number: CN202410479871.XA
Authority: CN
Inventors: 池明波; 李海瑞; 宋子恒; 高全武; 张帅; 孟显伟; 关磊; 张欣然; 冯淦; 郭斌; 刘鑫; 石建军
Original assignee: China Academy of Safety Science and Technology CASST
Current assignee: China Academy of Safety Science and Technology CASST
Priority date: 2024-04-22
Filing date: 2024-04-22
Publication date: 2024-05-28
Anticipated expiration: 2044-04-22
Also published as: CN118098062B

Abstract

The invention discloses a similar simulation experiment device for simulating coal seam exploitation and filling. After the paraffin similar coal seam melts, the paraffin flows into the paraffin recovery tank and is supplied to the paraffin filling tank, after the paraffin is solidified in the paraffin filling tank, the paraffin can be pushed into the goaf for filling, the characteristics of the paraffin materials are fully utilized, no additional filling materials are needed, materials are saved, cost is reduced, simulated mining is realized, a filling support mechanism is moved and the goaf is gradually filled, and obtained theoretical data provide theoretical guidance for mining and filling for coal mining.

Description

A analogue simulation experiment device for simulating coal seam exploitation and filling

Technical Field

The invention relates to the technical field of coal mining simulation, in particular to a similar simulation experiment device for simulating coal mining and filling.

Background

In order to improve the mining efficiency and safety of the coal mine, a similar simulation device is generally adopted to simulate the coal mining before the formal coal mining so as to provide a prediction study for the actual mining.

In order to simulate coal seam excavation, some of the prior art adopts a cutting mode, and some adopt a pumping pipe mode. The mode of adopting the slitting and the extraction pipe all needs to be disassembled box side plate or box bottom plate, and the simulation mode is complicated.

Based on this, methods for simulating coal seam mining using paraffin have been proposed in the prior art. The Chinese patent publication No. CN110297070A discloses a three-dimensional solid-liquid coupling analog simulation system for coal seam excavation, which simulates a coal seam to be made of paraffin, a heating device is arranged between the coal seam and a lower stratum, and the coal seam excavation is simulated by melting the paraffin. The heating device is provided with a heating plate, the heating plate consists of a plurality of rectangular heating plates, and each heating plate can independently heat and the heating power is adjustable.

The defect of above-mentioned technique is that the hot plate is in the bottom of paraffin coal seam, and paraffin begins to melt from the bottom, and paraffin at top melts slowly, and the paraffin of below melts the back, and the paraffin of top can drop down, causes the similar stratum of top to stride and falls, influences simulation effect. The heating plate consists of a plurality of heating plates, each heating plate needs to be connected with a wire independently to realize independent control, and more wire harnesses are inconvenient to arrange in a simulation box with limited volume.

In actual exploitation, under some working conditions, the goaf needs to be filled while being exploited so as to reduce the mine pressure born by the hydraulic support. Filling effect is simulated in the similar experimental process, filling theoretical guidance is provided for actual mining, and coal mining safety is improved. In the existing simulation experiment technology, the goaf filling simulation research is less.

The Chinese patent publication No. CN214309532U discloses a similar simulation experiment device capable of simulating a filling mining process, and a filling conduit and a filling pump are used for filling a goaf. The whole goaf needs to be filled every time, and the situation of strip filling cannot be simulated, and coal mining and filling cannot be simulated.

In view of the foregoing, it is desirable to provide a simulation experiment apparatus for simulating coal mining and filling.

Disclosure of Invention

The invention aims to overcome the defects of the prior art, and provides a similar simulation experiment device for simulating coal seam mining and filling, wherein the electrode tip is positioned at the approximate middle position of a paraffin similar coal seam, paraffin is gradually dissolved from the inside, the paraffin is more uniformly melted, a plurality of wire harnesses are not needed to be arranged, the structure is convenient, the coal seam mining can be simulated, the goaf is simulated to be filled in a strip mode, theoretical guidance of mining and filling is provided for coal mining, and the coal mining safety is improved.

The technical scheme of the invention provides a similar simulation experiment device for simulating coal mining and filling, which comprises a similar simulation box, a heating electrode mechanism, a wax liquid recovery box and a filling bracket mechanism;

The simulation box comprises a simulation box bottom plate, a front side plate, a rear side plate and a transparent glass plate; a paraffin similar coal bed is arranged above the simulation box bottom plate, a plurality of liquid leakage holes are formed in the simulation box bottom plate at intervals, and an electric control valve is arranged in each liquid leakage hole;

The wax liquid recovery box is positioned below the bottom plate of the simulation box and is used for recovering the wax liquid flowing out from each liquid leakage hole, and a wax liquid supply pump is arranged in the wax liquid recovery box;

The heating electrode mechanism comprises an insulating sleeve connected with the rear side plate and capable of moving back and forth and an electrode head connected to one end of the insulating sleeve; the main body part of the insulating sleeve and the electrode tip are embedded in the paraffin similar coal seam, and the electrode tip is positioned at one side close to the front side plate;

the filling support mechanism comprises a hydraulic support and a paraffin filling box arranged on a support bottom plate of the hydraulic support, and the paraffin filling box is connected with the paraffin supply pump through a paraffin supply pipe;

when the mining is simulated, the electrode tip is electrified and gradually retreats along with the insulating sleeve to gradually melt the paraffin similar coal seam, the filling support mechanism can be transferred into a goaf, and paraffin blocks are filled into the goaf through the paraffin filling box.

In one of the alternative technical schemes, a driving mechanism for driving the insulating sleeve to move is arranged on the rear side plate;

the driving mechanism comprises a first internal thread sleeve which is pivotally connected with the rear side plate and a driving assembly which is arranged on the outer side of the rear side plate, and the driving assembly is in transmission connection with the first internal thread sleeve;

The outer surface of the insulating sleeve is provided with external threads, the insulating sleeve penetrates through the first internal thread sleeve, and the first internal thread sleeve is meshed with the insulating sleeve for transmission.

In one optional technical scheme, a pushing mechanism is connected between the bracket bottom plate and the front side plate;

the pushing mechanism comprises a second internal thread sleeve, a fixed shaft sleeve, an external thread sleeve and a power assembly;

The second internal thread sleeve is pivotally connected with the front side plate, and the power assembly is arranged on the outer side of the front side plate and is in transmission connection with the second internal thread sleeve;

The bottom plate of the bracket is provided with a bottom plate channel extending from front to back, the bottom plate channel is positioned at one side of the paraffin filling box, the fixed shaft is sleeved in the front end opening of the bottom plate channel, and the rear end opening of the bottom plate channel is positioned on the top surface of the bottom plate of the bracket;

The external thread sleeve passes through the second internal thread sleeve, and the second internal thread sleeve is meshed with the external thread sleeve for transmission;

the rear end of the external thread sleeve passes through the fixed shaft sleeve and extends into the bottom plate channel;

the external thread sleeve is connected with the fixed shaft sleeve and is kept axially fixed;

the wax liquid supply pipe passes through the rear end opening from the front end of the externally threaded sleeve backwards and is connected to the paraffin filling box.

In one alternative, a protective sleeve is arranged in the external thread sleeve, the protective sleeve is installed in the external thread sleeve through a bearing, and the wax liquid supply pipe passes through the protective sleeve.

In one alternative, the pushing mechanism comprises two second internally threaded sleeves, two fixed shaft sleeves and two externally threaded sleeves;

Two bottom plate channels are arranged in the bottom plate of the bracket and are positioned on two opposite sides of the paraffin filling box;

the two fixed shaft sleeves are correspondingly arranged in the front end openings of the two bottom plate channels;

the two second internal thread sleeves are respectively and pivotally connected with the front side plate, and the power assembly is respectively and drivingly connected with the two second internal thread sleeves;

The two external thread sleeves are respectively matched with the two second internal thread sleeves and the two fixed shaft sleeves correspondingly;

the wax liquid supply pipe passes through one of the externally threaded sleeves, and the lead wire and/or the oil supply pipe passes through the other externally threaded sleeve.

In one optional technical scheme, a containing groove for containing the filling bracket mechanism is formed in one side of the front side plate, which faces the rear side plate, and a lifting door is arranged at an opening of one side of the containing groove, which faces the rear side plate;

In the initial state, the filling bracket mechanism is positioned in the accommodating groove, and the lifting door is in a closed state;

When simulating mining, the lifting door is opened, and the filling support mechanism is pushed into the goaf through the pushing mechanism.

In one optional technical scheme, the paraffin filling box comprises a box back plate, a box top plate and two box side plates;

The box back plate is fixedly connected with the bracket bottom plate, and the box top plate is connected to the upper end of the box back plate and extends forwards;

The two box side plates are respectively connected with the box back plate, the bracket bottom plate and the box top plate in a sliding manner, and a push-pull mechanism for driving the box side plates to slide linearly is connected between the box back plate and the box side plates;

The rear end of the box top plate is provided with a rolling door for opening and closing an opening between two box side plates, a traction mechanism for traction of the rolling door is arranged in the bracket bottom plate, and a guy cable of the traction mechanism is connected with the rolling door;

the upper part of the box back plate is provided with a filling box liquid inlet, and a liquid outlet of the wax liquid supply pipe is connected with the filling box liquid inlet;

The box back plate is also provided with a pushing mechanism for pushing out the paraffin blocks;

The front end of the box body side plate is positioned at the front side edge of the bracket bottom plate, and the front side edge of the bracket bottom plate is provided with a guiding inclined plane for guiding the paraffin block to slide downwards.

In one optional technical scheme, the box backboard comprises a backboard fixing board fixedly connected with the bracket bottom board, a backboard lifting board slidingly connected with the backboard fixing board and a backboard lifting actuating mechanism connected between the backboard lifting board and the backboard fixing board;

The box side plate comprises a side plate fixing plate, a side plate lifting plate and a side plate lifting actuating mechanism, wherein the side plate fixing plate is in sliding connection with the support bottom plate, the side plate lifting plate is in sliding connection with the side plate fixing plate, and the side plate lifting actuating mechanism is connected between the side plate lifting plate and the side plate fixing plate;

The side plate fixing plate is in sliding connection with the back plate fixing plate, the side plate lifting plate is in sliding connection with the back plate lifting plate, the box top plate is in fixed connection with the back plate lifting plate, and the side plate lifting plate is in sliding connection with the box top plate;

The liquid inlet of the filling box is arranged on the backboard lifting plate, and the push-out mechanism is connected with the backboard fixing plate.

In one optional technical scheme, the simulation experiment device comprises a hot water supply tank, wherein a water supply pump is arranged in the hot water supply tank;

A wall water cavity is formed in the wall of the wax liquid recovery box, and a thermometer is arranged in the wall water cavity;

the water supply pump is connected with the wall water cavity through a first water supply pipe;

when the wax liquid recovery box recovers the wax liquid, the water cavity of the wall of the box is filled with hot water.

In one optional technical scheme, a pipe wall water cavity is formed in the pipe wall of the insulating sleeve, and the water supply pump is connected with the pipe wall water cavity through a second water supply pipe;

when the simulated exploitation pulls the insulating sleeve backwards, the pipe wall water cavity is filled with hot water.

By adopting the technical scheme, the method has the following beneficial effects:

According to the simulation experiment device provided by the invention, when simulated exploitation is performed, the electrode tip is electrified and gradually retreats along with the insulating sleeve, so that a paraffin similar coal seam is gradually melted to simulate coal seam exploitation, after a goaf is formed, the filling support mechanism is transferred into the goaf, the top plate of the coal seam is supported by the hydraulic support, and then paraffin blocks are filled into the goaf through the paraffin filling box, so that strip filling is formed. After the paraffin similar coal seam melts, the paraffin flows into the paraffin recovery box and is supplied to the paraffin filling box, the paraffin can be pushed into the goaf for filling after being solidified in the paraffin filling box, the characteristics of the paraffin materials are fully utilized, no additional filling materials are needed, materials are saved, and cost reduction is facilitated.

According to the simulation experiment device provided by the invention, the electrode tip is positioned at the approximate middle position of the paraffin similar coal seam, paraffin is gradually dissolved from the inside, paraffin is melted more uniformly, a plurality of wire harnesses are not needed to be arranged, the structure arrangement is convenient, the simulation exploitation is realized, the filling support mechanism is moved and the goaf is gradually filled at the same time, the obtained theoretical data provides theoretical guidance for exploitation and filling for coal exploitation operation, and the safety of coal exploitation operation is improved.

Drawings

The present disclosure will become more readily understood with reference to the accompanying drawings. It should be understood that: the drawings are for illustrative purposes only and are not intended to limit the scope of the present invention. In the figure:

FIG. 1 is a schematic diagram of a simulation experiment apparatus according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of the simulation experiment apparatus of FIG. 1 in simulating production;

FIG. 3 is a schematic view of the lift gate after the goaf is formed;

FIG. 4 is a schematic view of the filling support mechanism being transferred into the goaf;

FIG. 5 is a schematic illustration of a paraffin filling tank filling paraffin blocks into the goaf;

FIG. 6 is a schematic view of the paraffin filling box after filling a plurality of paraffin blocks into the goaf;

FIG. 7 is an enlarged schematic view of a simulation box;

FIG. 8 is an enlarged schematic view of a wax liquid recovery tank;

FIG. 9 is an enlarged schematic view of a heater electrode mechanism;

FIG. 10 is a schematic illustration of the hot water being replenished in the tube wall water cavity of the insulating sleeve of the heating electrode mechanism;

FIG. 11 is a schematic view of a rear side plate having a drive mechanism mounted thereon for driving movement of the insulating sleeve;

FIG. 12 is a schematic view of the structure of the filling stand mechanism;

FIG. 13 is a schematic view of the filling support mechanism from the front end;

FIG. 14 is a cross-sectional view taken along line A-A of FIG. 13;

FIG. 15 is a cross-sectional view of the bracket floor along the horizontal direction;

FIG. 16 is a schematic illustration of the attachment of the pushing mechanism to the base plate of the bracket;

FIG. 17 is an enlarged view of a portion of the connection of the protective sleeve, the wax liquid supply tube, and the externally threaded sleeve;

FIG. 18 is a schematic view of the front side plate having a power assembly mounted thereon for driving rotation of the second threaded sleeve;

FIG. 19 is a schematic view of the connection of the paraffin-filled bin to the bracket floor, with the tambour door in a lowered condition;

FIG. 20 is a schematic view of the connection of the paraffin-filled bin to the bracket floor, with the tambour door in a raised condition;

FIG. 21 is a perspective view of the paraffin-filled bin with the tambour door in a raised condition;

FIG. 22 is a schematic view of a filling tank inlet provided in the upper portion of the tank back plate;

FIG. 23 is a schematic view of a back plate lift actuator mechanism between a back plate lift plate and a back plate securing plate;

FIG. 24 is a cross-sectional view of the paraffin-filled bin taken along a horizontal direction, with the tambour door in a lowered condition;

FIG. 25 is a schematic view of a tambour door mounted to the front end of the top panel of the cabinet;

FIG. 26 is a schematic view of a traction mechanism provided in a bracket floor for pulling a tambour door;

FIG. 27 is a schematic illustration of the wax liquid entering the wax filling tank to solidify into a wax block;

FIG. 28 is a schematic view of the rolling shutter door after being raised prior to pushing out the paraffin block;

FIG. 29 is a schematic view of the two side plates of the case being moved laterally away from the paraffin block prior to pushing out the paraffin block;

Fig. 30 is a schematic view of the pushing mechanism pushing out the paraffin block.

Detailed Description

Specific embodiments of the present invention will be further described below with reference to the accompanying drawings. Wherein like parts are designated by like reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the drawings, and the words "inner" and "outer" refer to directions toward or away from, respectively, the geometric center of a particular component.

As shown in fig. 1-10, 12 and 27-30, a simulation experiment device for simulating coal mining and filling according to an embodiment of the present invention includes a simulation box 1, a heating electrode mechanism 2, a wax liquid recovery box 3 and a filling support mechanism 4.

The analog simulation box 1 includes a simulation box bottom plate 11, a front side plate 12, a rear side plate 13, and a transparent glass plate. A paraffin similar coal seam 14 is arranged above the simulation box bottom plate 11, a plurality of weeping holes 111 are arranged on the simulation box bottom plate 11 at intervals, and an electric control valve 112 is arranged in each weeping hole 111.

The wax liquid recovery tank 3 is disposed below the simulation tank bottom plate 11 for recovering the wax liquid 10 flowing out from each of the weeping holes 111, and a wax liquid supply pump 32 is provided in the wax liquid recovery tank 3.

The heating electrode mechanism 2 includes an insulating sleeve 21 connected to the rear side plate 13 and movable back and forth, and an electrode tip 22 connected to one end of the insulating sleeve 21. The main body of the insulating sleeve 21 and the electrode tip 22 are embedded in the paraffin-like coal seam 14, and the electrode tip 22 is positioned on the side close to the front side plate 12.

The filling stand mechanism 4 includes a hydraulic stand 41 and a paraffin filling tank 42 provided on a stand bottom plate 411 of the hydraulic stand 41, and the paraffin filling tank 42 is connected to the paraffin supply pump 32 through a paraffin supply pipe 33.

In simulated mining, the electrode head 22 is energized and gradually retreats with the insulating sleeve 21 to gradually melt the paraffin-like coal seam 14, the filling support mechanism 4 can be transferred into the goaf 18, the roof of the coal seam is supported by the hydraulic support 41, and the goaf 18 is filled with the paraffin block 20 by the paraffin filling box 42.

The simulation experiment device provided by the invention is used for simulating coal mining and goaf filling.

The present invention is defined in terms of the moving direction of the heating electrode mechanism 2, and is described for convenience. Specifically, the direction in which the heating electrode mechanism 2 protrudes into the analog box 1 is referred to as the front side, that is, the right side in fig. 1; the direction in which the heating electrode mechanism 2 is withdrawn to the outside of the analogue case 1 is referred to as the rear side, i.e., the left side in fig. 1.

The simulation experiment device comprises a simulation box 1, a heating electrode mechanism 2, a wax liquid recovery box 3, a filling support mechanism 4 and the like.

The analogue box 1 can be mounted on a laboratory bench or can be fixed by a fixed frame 8.

The box body of the analog box 1 is of a hexahedral structure with an open top, and comprises an analog box bottom plate 11, a front side plate 12, a rear side plate 13 and two transparent glass plates. The front side plate 12 and the rear side plate 13 are fixedly connected to the front and rear ends of the analog bottom plate 11 and extend upward. Two transparent glass plates are connected between the two ends of the front side plate 12 and the rear side plate 13, and the bottoms of the transparent glass plates are connected with the edges of the simulation box bottom plate 11. The transparent glass plate can be an organic glass plate, and has high structural strength. The user can observe the working conditions in the analog box 1 from the transparent glass plate. A paraffin-like coal seam 14, a similar overburden 15, a similar aquifer 16 and a similar overburden 17 are sequentially arranged above the simulated box floor 11. Each of the similar layers is made of a material, which is a prior art and will not be described in detail herein.

The paraffin-like coal seam 14 is made of paraffin, and the paraffin-like coal seam 14 is formed after the paraffin-like coal seam is solidified by filling a certain amount of paraffin liquid into the similarity simulation box 1 in the early stage. After formation of the paraffin-like coal seam 14, a similar overburden 15, a similar aquifer 16, and a similar overburden 17 are constructed in that order.

The simulation floor 11 is provided with a plurality of drain holes 111 at intervals, and the plurality of drain holes 111 are arranged in a matrix on the simulation floor 11, and are arranged at intervals along the width direction of the simulation floor 11 and also along the length direction of the simulation floor 11. The longitudinal direction of the simulation floor 11 is the front-rear direction. An electric control valve 112 is installed in each weeping hole 111, and the electric control valve 112 can be an electromagnetic valve. The electric control valve 112 is connected with a control system of a similar simulation experiment device, and the control system controls the automatic opening and closing of the electric control valve 112.

The heating electrode mechanism 2 includes an insulating sleeve 21 and an electrode tip 22, and the insulating sleeve 21 is connected to the rear side plate 13 so as to be slidable back and forth with respect to the rear side plate 13. The electrode tip 22 is connected to the front end of the insulating sleeve 21, which is in the analog box 1. A wire 23 connected to the electrode tip 22 passes through a center hole of the insulating sleeve 21. In the height direction, the insulating sleeve 21 and the electrode tip 22 are located between the upper and lower surfaces of the paraffin-like coal seam 14, preferably at an intermediate position of the paraffin-like coal seam 14. As required, a plurality of sets of heating electrode mechanisms 2 may be arranged at intervals in the width direction, with a plurality of electrode tips 22 in the paraffin-like coal seam 14 in the width direction. When the electrode tip 22 is electrified and heated, peripheral paraffin is melted, paraffin similar to the coal seam 14 is gradually melted from the middle to the periphery, paraffin layers on the upper side and the lower side of the electrode tip 22 are all gradually melted, and the paraffin layers on the upper layer are gradually thinned and cannot suddenly collapse, so that the defect that paraffin on the upper layer collapses due to the fact that paraffin is melted from the bottom by heating in the prior art can be avoided.

In order to achieve similar exploitation of the simulated coal seam, the insulating sleeve 21 can drive the electrode tip 22 to gradually retract so as to gradually melt the paraffin similar coal seam 14 backwards, and the coal seam exploitation is simulated. The insulating sleeve 21 is slidably connected to the rear end plate 13. The rear end of the insulating sleeve 21 protrudes from the rear side of the rear end plate 13, and may be supported by a sliding mechanism to maintain stability of the insulating sleeve 21, or may be connected to a driving device to drive the insulating sleeve 21 to slide linearly. Specifically, the through hole 131 may be formed in the rear end plate 13, and the center line of the through hole 131 may be positioned at a half thickness of the paraffin-like coal seam 14, so that the insulating sleeve 21 and the electrode tip 22 may be ensured to be positioned at about the middle of the paraffin-like coal seam 14. The insulating bushing 21 passes through the through hole 131. A sealing ring is arranged between the two.

In order to avoid that the whole of the paraffin-like coal layer 14 melts or the melting area of the paraffin-like coal layer 14 in the front-rear direction is long when the electrode tip 22 is too long to cause each energization, the following design is adopted:

The insulating sleeve 21 is made of insulating material, is not electrically conductive and is not thermally conductive. The rear end of the electrode tip 22 is embedded in the front end of the insulating sleeve 21, and the main body portion of the electrode tip 22 protrudes from the front side of the insulating sleeve 21. When the electrode tip 22 conducts electricity, only the part of the electrode tip 22 extending out of the front side part of the insulating sleeve 21 melts paraffin, the insulating sleeve 21 does not heat and melt paraffin, so that the push-pull distance of each time is conveniently controlled, the melting area of each time of the paraffin-like coal seam 14 is controlled, and the simulated coal seam mining is conveniently realized.

When the paraffin-like coal seam 14 is produced, the insulating sleeve 21 is moved toward the front end plate 12 side, and the electrode tip 22 is driven to move to the vicinity of the front end plate 12. At this time, the main body portion or most of the insulating bush 21 is inside the rear end plate 13. Then, the wax liquid is added to the similar simulation box 1 to a preset height. After the wax liquid is solidified, the main body part of the insulating sleeve 21 and the electrode tip 22 are pre-buried in the paraffin-like coal seam 14. To ensure the subsequent movable insulating sleeve 21, the insulating sleeve 21 may be reciprocally moved slightly or rotated before the wax liquid is solidified, reducing the adhesion of the wax liquid to the insulating sleeve 21, so that a gap is formed between the solid paraffin and the insulating sleeve 21 after the paraffin is solidified, facilitating the subsequent movement of the insulating sleeve 21.

During simulated exploitation, the electrode tip 22 is electrified to generate heat, and meanwhile, a user pulls the insulating sleeve 21 to gradually retreat manually or through the driving device, and the electrode tip 22 gradually retreats along with the insulating sleeve 21, so that the paraffin similar coal seam 14 can be gradually melted, and the coal seam exploitation is simulated. After each pulling of the insulating sleeve 21 back a preset distance, the preset time is paused as needed, and the electrode tip 22 stays at this position to melt the surrounding paraffin. The preset distance can be set according to actual needs, and the preset distance can simulate each advancing cutter of the coal mining machine. The predetermined time may be determined according to the heating value of the electrode tip 22 and the volume of the surrounding paraffin, and may be calculated by a plurality of experiments to obtain a proper time. The lead 23 of the electrode head 22 is connected with a control system of a similar simulation experiment device, and the control system controls the on-off of a circuit.

The wax liquid recovery tank 3 is connected below the simulation tank bottom plate 11 for recovering the wax liquid 10 flowing out from each weep hole 111. The wax liquid recovery tank 3 comprises a tank wall 31, the tank wall 31 encloses a container, and the upper end of the tank wall 31 is fixedly connected with the simulated tank bottom plate 11, and can be connected through bolts and the like. The upper end opening of the container encloses all the weep holes 111. The wax liquid recovery tank 3 is provided with a wax liquid supply pump 32, and a wax liquid supply pipe 33 is connected to an output port of the wax liquid supply pump 32, and the wax liquid supply pipe 33 is used for supplying the liquid wax liquid 10 to the paraffin filling tank 42. The wax liquid supply pipe 33 is connected to a control system of a similar simulation experiment apparatus, and the control system controls the switching of the wax liquid supply pipe 33.

In the similar simulation exploitation, with the backward pushing movement of the insulating sleeve 21, the electric control valves 112 in the drain holes 111 below are opened in sequence, and all the electric control valves 112 can be opened. After the electrode tip 22 heats the paraffin-like coal seam 14, melted paraffin solution (abbreviated as paraffin solution) flows into the paraffin solution recovery tank 3 through the drain hole 111 below. The wax liquid supply pump 32 is turned on, and the wax liquid in the wax liquid recovery tank 3 is sent to the paraffin filling tank 42 for solidification. The wax liquid supply pump 32 may be turned on and off as needed. An insulating layer may be provided on the tank wall 31 to prevent the wax liquid from solidifying in the wax liquid recovery tank 3. Heating plates may be provided in the tank wall 31 as needed to perform a heating function so as to prevent the wax liquid from solidifying in the wax liquid recovery tank 3. According to the requirement, a thermometer, a liquid level meter and the like can be arranged in the wax liquid recovery box 3, and the thermometer and the liquid level meter are respectively connected with a control system of the similar simulation experiment device. The current temperature in the wax liquid recovery tank 3 can be judged according to the monitoring value of the thermometer, and if the current temperature is slightly higher than the melting point of paraffin, the wax liquid recovery tank 3 needs to be heated. The liquid level meter is used for monitoring the liquid level of the wax liquid in the wax liquid recovery tank 3 and is used for measuring the current wax liquid capacity in the wax liquid recovery tank 3.

The filling stand mechanism 4 includes a hydraulic stand 41 and a paraffin filling tank 42. The hydraulic mount 41 is a conventional similar hydraulic mount including a mount bottom plate 411, a mount top plate 413, and a hydraulic ram 412 connected between the mount bottom plate 411 and the mount top plate 413. The paraffin filling box 42 is provided on the bracket floor 411, which is on the front side of the hydraulic cylinder 412. The front side edge of the paraffin filling box 42 is disposed next to the front end of the rack base 411 so as to fill the molded paraffin block 20 in the goaf 18 on the front side of the rack base 411. The paraffin filling box 42 is used for receiving the paraffin supplied from the paraffin supply pipe 33, waiting for solidification, automatically opening the front end of the paraffin filling box 42 after the paraffin 10 is solidified into the paraffin block 20, and pushing the paraffin block 20 into the goaf 18 on the front side. The front end of the paraffin-filled tank 42 may be provided with a power door to automatically open and close.

If desired, a level gauge may be provided in the wax filling tank 42, which is connected to a control system of a similar simulation experiment apparatus for monitoring the wax level in the wax filling tank 42.

If necessary, a cooling unit, such as a condenser, a heat exchanger, etc., may be provided on the wall of the paraffin filling tank 42 to increase the solidification rate of the paraffin liquid. The wax liquid can be quickly solidified by adding a flocculating agent.

The solidification time of the wax liquid in the wax filling tank 42 can be measured by a plurality of tests for the subsequent judgment of the time point of pushing out the wax block 20.

The paraffin filling tank 42 has a filling tank liquid inlet 420, and the filling tank liquid inlet 420 is located in the upper half of the paraffin filling tank 42, and the filling tank liquid inlet 420 is connected to the paraffin supply pump 32 through the paraffin supply pipe 33.

In simulated mining, the goaf 18 is formed on the front side of the electrode tip 22 as it retreats, and at this time, the filling holder mechanism 4 may be pushed into the goaf 18. A cover 123 that can be opened and closed may be provided at the lower portion of the front end plate 12, as needed. Before simulated mining, the cover plate 123 is closed, after the goaf is formed, the cover plate 123 is opened, the filling rack mechanism 4 is pushed into the goaf 18 from the opening formed by the cover plate 123, and the paraffin filling box 42 is made to face one side of the front end plate 12. If necessary, a push rod may be connected to the support base 411 for a user or a driving device to push the filling support mechanism 4 to move toward one side of the rear end plate 13, so as to simulate the frame moving during coal mining.

If desired, the filling support means 4 may also be pre-buried in a similar layer of paraffin coal 14, which is placed against the front end plate 12.

After each retraction of the electrode head 22, the hydraulic mount 41 is moved backward with the paraffin filling box 42. During this process, the paraffin block 20 is formed into a strip shape by pushing the paraffin block 42 forward into the goaf 18. Because the paraffin blocks 20 filled in the goaf 18 do not need to be fully topped up or fully transversely filled in the goaf 18, and because the width of the paraffin-like coal seam 14 is larger than the width of the paraffin filling box 42 and the height is also larger than the height of the paraffin filling box 42, the amount of paraffin melted by the paraffin-like coal seam 14 each time is far larger than the amount of paraffin that can be received by the paraffin filling box 42, and the paraffin filling box 42 can be filled with the paraffin-like coal seam 14 each time.

If necessary, a camera may be suspended from the fixed frame 8, which is oriented towards the transparent glass plate, and changes in the layers of similar material within the similar simulation box 1 may be taken.

If necessary, a pressurizing mechanism 9 may be provided on the fixed frame 8, and a pressing plate 91 of the pressurizing mechanism 9 is pressed against the similar overburden 17 to simulate the top mine pressure.

A pressure sensor may be provided on the bracket top plate 413 as needed. The pressure sensor is connected with a control system of the analogue experimental device. The effect of the paraffin block 20 in the goaf 18 can be known by monitoring the pressure change and the stress change of the bracket top plate 413. For example, when the goaf is not yet filled with paraffin blocks 20, the pressure born by the bracket top plate 413 is F1, and after the goaf is filled with paraffin blocks 20, the pressure born by the bracket top plate 413 is F2, and since the straddling similar overburden is supported by the paraffin blocks 20 below, F2 should be theoretically much smaller than F1, and F2 < F1-a, a is set to be a preset constant. If the detected value of F2 is smaller than F1-a, the height and width of the current paraffin block 20 are consistent with the current mineral pressure requirement, and the filling requirement is met. If the detected F2 is more than or equal to F1-a, the height and the width of the current paraffin block 20 are not in accordance with the current mineral pressure requirement, the filling requirement cannot be met, and the height and/or the width of the current paraffin block 20 need to be increased.

In summary, in the simulation experiment device provided by the invention, during simulated mining, the electrode tip 22 is electrified, the electrode tip 22 gradually retreats along with the insulating sleeve 21, so that the paraffin-like coal seam 14 is gradually melted to simulate coal seam mining, after the goaf 18 is formed, the filling support mechanism 4 is transferred into the goaf 18, the top plate of the coal seam is supported by the hydraulic support 41, and then the paraffin block 20 is filled into the goaf 18 through the paraffin filling box 42 to form strip filling. After the paraffin-like coal seam 14 melts, the paraffin liquid 10 flows into the paraffin liquid recovery box 3 and is supplied to the paraffin filling box 42, and after the paraffin liquid 10 is solidified in the paraffin filling box 42, the paraffin liquid can be pushed into the goaf 18 for filling, so that the characteristics of paraffin materials are fully utilized, no additional filling materials are needed, the materials are saved, and the cost is reduced.

According to the simulation experiment device provided by the invention, the electrode tip 22 is positioned at the approximate middle position of the paraffin-like coal seam 14, paraffin is gradually dissolved from the inside, paraffin is more uniformly melted, a plurality of wire harnesses are not needed to be arranged, the structure arrangement is convenient, the simulation exploitation is realized, the filling support mechanism 4 is moved and the goaf 18 is gradually filled at the same time, the obtained theoretical data provide theoretical guidance of exploitation and filling for coal exploitation operation, and the safety of coal exploitation operation is facilitated to be improved.

In one of the embodiments, as shown in fig. 11, a driving mechanism 5 for driving the movement of the insulating bush 21 is mounted on the rear side plate 13.

The drive mechanism 5 comprises a first internally threaded sleeve 51 pivotally connected to the rear side plate 13 and a drive assembly 52 mounted outside the rear side plate 13, the drive assembly 52 being in driving connection with the first internally threaded sleeve 51.

The outer surface of the insulating sleeve 21 is provided with external threads, the insulating sleeve 21 passes through a first internal thread sleeve 51, and the first internal thread sleeve 51 is meshed with the insulating sleeve 21 for transmission.

In this embodiment, the motor screw principle is used to drive the insulating bush 21 to move linearly. The drive mechanism 5 is mounted on the rear side plate 13 and comprises a first internally threaded sleeve 51 and a drive assembly 52. The first female sleeve 51 is bearing-mounted in the through hole 131 of the rear side plate 13. The inner surface of the first internally threaded sleeve 51 has internal threads. The insulating sleeve 21 is an externally threaded sleeve, the outer surface of the insulating sleeve is provided with external threads, and the insulating sleeve 21 passes through the first internally threaded sleeve 51 and is in meshed transmission with the first internally threaded sleeve.

A driving assembly 52 is mounted on the outer surface of the rear side plate 13 for driving the first female screw sleeve 51 to rotate. The drive assembly 52 includes a first motor 521, a first gear 522, and a second gear 523. The first gear 522 may be mounted on the shaft of the first motor 521 or may be in driving connection with the shaft of the first motor 521. The second gear 523 is fixedly sleeved on the first internally threaded sleeve 51, and the second gear 523 and the first internally threaded sleeve rotate integrally. The second gear 523 meshes with the first gear 522. When the first motor 521 rotates forward, the insulating bush 21 is driven to move forward; when the first motor 521 rotates reversely, the insulating bush 21 is driven to move backward. The first motor 521 is connected to a control system, and is controlled to operate by the control system.

In one embodiment, as shown in fig. 14-18, a pushing mechanism 6 is connected between the bracket bottom plate 411 and the front side plate 12.

The pushing mechanism 6 comprises a second internally threaded sleeve 61, a fixed sleeve 62, an externally threaded sleeve 63 and a power assembly 64.

The second internally threaded sleeve 61 is pivotally connected to the front side plate 12 and the power assembly 64 is mounted on the outside of the front side plate 12 and is drivingly connected to the second internally threaded sleeve 61.

The bracket floor 411 is provided with a floor passage 4112 extending from front to back, the floor passage 4112 is located on one side of the paraffin filling box 42, and the fixing boss 62 is provided in a front end opening of the floor passage 4112, and a rear end opening 4113 of the floor passage 4112 is located on a top surface of the bracket floor 411.

The externally threaded sleeve 63 passes through the second internally threaded sleeve 61, and the second internally threaded sleeve 61 is in meshed driving engagement with the externally threaded sleeve 63.

The rear end of the externally threaded sleeve 63 passes through the fixed sleeve 62 and extends into the base plate channel 4112.

An externally threaded sleeve 63 is connected to the fixed sleeve 62 and remains axially fixed.

The wax liquid supply pipe 33 passes out of the rear end opening 4113 from the front end of the externally threaded sleeve 63 rearward, and is connected to the paraffin filling tank 42.

In this embodiment, a pushing mechanism 6 is connected between the bracket bottom plate 411 and the front side plate 12, for pushing the filling bracket mechanism 4 to move backward. The pushing mechanism 6 mainly comprises a second internally threaded sleeve 61, a fixed shaft sleeve 62, an externally threaded sleeve 63, a power assembly 64 and the like.

The second internally threaded sleeve 61 is bearing-mounted in a through hole of the front side plate 12, in particular, it may be mounted on the end cap 123. The inner surface of the second internally threaded sleeve 61 has an internal thread. The externally threaded sleeve 63 is a metal tube, and has external threads on its outer surface, which plays a role in pushing the filling holder mechanism 4 as well as threading. An externally threaded sleeve 63 passes through the second internally threaded sleeve 61, both in threaded drive.

The fixing boss 62 is provided at the front end of the bracket bottom plate 411, and specifically, a bottom plate passage 4112 is provided in the bracket bottom plate 411, the bottom plate passage 4112 being located at one side of the paraffin charge tank 42 and extending from front to rear. The fixing sleeve 62 is disposed in the front opening of the bottom plate channel 4112, and the rear opening 4113 of the bottom plate channel 4112 is located on the top surface of the bracket bottom plate 411 for the pipeline to pass out for connection with the hydraulic bracket 41 and the paraffin filling box 42.

The rear end of the externally threaded sleeve 63 passes through the fixed sleeve 62 and extends into the base plate channel 4112. The externally threaded sleeve 63 may be connected to the fixing sleeve 62 by a bearing or screw, and both are axially fixed, so that the externally threaded sleeve 63 may push the bracket base 411 through the fixing sleeve 62. The wax liquid supply pipe 33 passes through the externally threaded sleeve 63 from the front end of the externally threaded sleeve 63 back into the bottom plate passage 4112 and then out through the rear end opening 4113 to be connected to the paraffin filling tank 42. So arranged, the wiring function is realized while pushing the bracket bottom plate 411 through the externally threaded sleeve 63, and no wiring channel is required to be specially opened.

A power assembly 64 is mounted on the outside of the front side plate 12 for driving the second internally threaded sleeve 61 in rotation. The power assembly 64 includes a second motor 641, a third gear 642, and a fourth gear 643. The third gear 642 may be mounted on the rotation shaft of the second motor 641 or may be in driving connection with the rotation shaft of the second motor 641. The fourth gear 643 is fixedly sleeved on the second internally threaded sleeve 61, and the fourth gear 643 and the second internally threaded sleeve integrally rotate. The fourth gear 643 is in meshed transmission with the third gear 642. When the second motor 641 is rotated in the forward direction, the externally threaded sleeve 63 is driven to move backward, thereby pushing the filling holder mechanism 4 backward; when the second motor 641 is reversely rotated, the externally threaded sleeve 63 is driven to move forward, thereby pulling the filling holder mechanism 4 forward. The second motor 641 is connected to a control system, and is controlled to operate by the control system.

In one of the embodiments, as shown in fig. 16 to 18, a protection sleeve 631 is provided in the externally threaded sleeve 63, and the protection sleeve 631 is mounted in the externally threaded sleeve 63 through a bearing 632, and the wax liquid supply pipe 33 passes through the protection sleeve 631. In the present embodiment, the protection sleeve 631 is disposed in the externally threaded sleeve 63 to protect the wax liquid supply pipe 33. The protection sleeve 631 is mounted in the externally threaded sleeve 63 by means of the bearing 632, and during mounting and use, even if the externally threaded sleeve 63 is rotated, the protection sleeve 631 does not rotate, thereby ensuring that the wax liquid supply pipe 33 is not screwed, and avoiding the influence on the wax liquid supply.

In one embodiment, as shown in fig. 14-18, the pushing mechanism 6 comprises two second internally threaded sleeves 61, two fixed bushings 62 and two externally threaded bushings 63.

Two bottom plate channels 4112 are provided in the bracket bottom plate 411, the two bottom plate channels 4112 being on opposite sides of the paraffin filling box 42.

Two fixing bosses 62 are provided in the front end openings of the two bottom plate passages 4112, respectively.

The two second internally threaded sleeves 61 are pivotally connected to the front side plate 12, respectively, and the power assembly 64 is drivingly connected to the two second internally threaded sleeves 61, respectively.

The two externally threaded sleeves 63 respectively cooperate with the two second internally threaded sleeves 61 and the two fixed sleeves 62.

The wax feed pipe 33 passes through one externally threaded sleeve 63 and the wire and/or supply pipe passes through the other externally threaded sleeve 63.

In this embodiment, by configuring two externally threaded sleeves 63 and correspondingly configured second internally threaded sleeves 61 and fixed sleeves 62, the two second internally threaded sleeves 61 can be driven by the same set of power components 64, or can be synchronously driven by the two sets of power components 64, so that the bracket bottom plate 411 can be horizontally pushed from the left and right sides, which is beneficial to improving the stability of the movement of the push-pull hydraulic bracket 41. The wax liquid supply pipe 33 passes through one external screw sleeve 63, and the wires and/or the oil supply pipe connected with the electrical components and the oil cylinder on the hydraulic support 41 pass through the other external screw sleeve 63, so that wiring is facilitated.

In one of the embodiments, as shown in fig. 3 to 7, the front side plate 12 is provided with a receiving groove 121 for receiving the filling stand mechanism 4 on the side facing the rear side plate 13, and the opening of the receiving groove 121 on the side facing the rear side plate 13 is provided with a lifting door 122.

In the initial state, the filling holder mechanism 4 is in the accommodating groove 121, and the lift gate 122 is in the closed state.

In simulated mining, the lifting door 122 is opened and the filling carriage mechanism 4 is pushed into the goaf 18 by the pushing mechanism 6.

In this embodiment, a receiving groove 121 is provided at the bottom of the front side plate 12, an openable cover plate 123 is disposed outside the receiving groove 121, a lifting door 122 is disposed at an inner slot of the receiving groove 121, and the lifting door 122 can be driven to lift by a telescopic cylinder to open or close the inner slot of the receiving groove 121. An opening is provided in the dummy box floor 11 for the up-and-down movement of the lift gate 122. The telescopic cylinder is arranged at the bottom of the simulation box bottom plate 11 and is connected with the lower edge of the lifting door 122. The telescopic oil cylinder is controlled by a control system to actuate.

The thickness of the front side plate 12 may be set thicker so that the volume of the receiving groove 121 is sufficient to receive the filling bracket mechanism 4.

Before the paraffin-like coal seam 14 is molded, the filling support mechanism 4 is placed in the accommodating groove 121, the lifting door 122 is closed to prevent the paraffin from flowing into the accommodating groove 121, and the cover plate 123 is closed to shield the filling support mechanism 4. In simulated mining, after the goaf 18 is formed, the lifting door 122 is opened, and the filling bracket mechanism 4 is pushed into the goaf 18 by the pushing mechanism 6. By providing the accommodating groove 121 to simulate the cutting, the cutting is not required to be independently provided, and the filling support mechanism 4 is not required to be buried in the paraffin-like coal seam 14, so that the convenience of the experiment is improved.

In one embodiment, as shown in FIGS. 12-13, 19-22 and 24-30, the paraffin-filled tank 42 includes a tank back plate 421, a tank top plate 422 and two tank side plates 423.

The box back plate 421 is fixedly connected with the bracket bottom plate 411, and the box top plate 422 is connected to the upper end of the box back plate 421 and extends forward.

The two box side plates 423 are respectively connected with the box back plate 421, the bracket bottom plate 411 and the box top plate 422 in a sliding way, and a push-pull mechanism 425 for driving the box side plates 423 to slide linearly is connected between the box back plate 421 and the box side plates 423.

The rear end of the box top plate 422 is provided with a roller shutter door 424 for opening and closing an opening between the two box side plates 423, the bracket bottom plate 411 is provided with a traction mechanism 427 for traction of the roller shutter door 424, and a stay cable 4271 of the traction mechanism 427 is connected with the roller shutter door 424.

The upper part of the box back plate 421 is provided with a filling box liquid inlet 420, and the liquid outlet of the wax liquid supply pipe 33 is connected with the filling box liquid inlet 420.

The housing back plate 421 is further provided with a pushing mechanism 426 for pushing out the paraffin block 20.

The front end of the case side plate 423 is located at the front side edge of the bracket bottom plate 411, and the front side edge of the bracket bottom plate 411 is provided with a guide slope 4111 for guiding the paraffin block 20 to slide down.

In this embodiment, the paraffin filling box 42 includes a box back plate 421, a box top plate 422, and two box side plates 423. The box back plate 421 is fixedly connected with the bracket bottom plate 411, extends along the width direction, a filling box liquid inlet 420 is arranged at the upper part of the box back plate 421, and a liquid outlet of the wax liquid supply pipe 33 is connected with the filling box liquid inlet 420. The case top plate 422 is connected to the upper end of the case back plate 421 and extends forward. The case side plate 423 is slidably connected to the case back plate 421, the bracket bottom plate 411, and the case top plate 422, respectively, and the front end of the case top plate 422 extends out of the front side of the case side plate 423. The two side plates 423 can be adjusted along the width direction to form paraffin blocks 20 with different widths, and can be separated from the paraffin blocks 20 during demolding so as to facilitate demolding. A push-pull mechanism 425 is connected between the case back plate 421 and each case side plate 423 for driving the case side plate 423 to linearly slide in the width direction. The push-pull mechanism 425 may employ a telescoping cylinder, etc., which is controlled by a control system.

A roller shutter door 424 is arranged at the rear end of the box top plate 422, a traction mechanism 427 is arranged in the front end of the bracket bottom plate 411, and a guy cable 4271 of the traction mechanism 427 is connected with the lower end of the roller shutter door 424 for pulling down the roller shutter door 424 to be unfolded so as to close the front end opening between the two box side plates 423, thereby storing the wax liquid 10. If necessary, a sealing strip may be provided at the front end of the case side plate 423 to seal with the roll-up door 424. When it is necessary to push out the paraffin block 20 forward, the traction mechanism 427 releases the cable 4271, and the roll-up door 424 is automatically rolled up, thereby opening the front end opening between the two case side plates 423.

Specifically, a downward opening groove 4211 is provided at the rear end of the case top plate 422, a reel 4212 is mounted in the groove 4211, and a torsion spring is disposed between the groove wall of the groove 4211 and the reel 4212. The upper end of the roller door 424 is fixedly connected to the roller 4212, which may be wound on the roller 4212. The rolling door 424 may employ a rubber skin layer that can be rolled up, and a mesh structure may be built in the rubber skin layer to promote flexibility. A mounting cavity 4115 is provided in the front end of the bracket bottom plate 411, and a strip-shaped opening 4114 for the entry and exit of the cable 4271 is provided at the top of the mounting cavity 4115. The mounting cavity 4115 has a shaft 4272 mounted therein, the shaft 4272 being directly below the spool 4212, parallel and of substantially equal length. Both ends of the rotation shaft 4272 are respectively provided with a winding wheel, and each winding wheel is wound with a stay cable 4271. The spindle 4272 is driven by a motor 4273. The motor 4273 may be mounted on top of the carrier base 411 or in the mounting cavity 4115. The motor 4273 is switched by a control system. The two box side plates 423 always slide between the rolling wheels at the two ends of the rotating shaft 4272 and also always slide between the two ends of the rolling door 424, so that the two inhaul cables 4271 at the two ends are always positioned outside the two box side plates 423, the paraffin blocks 20 can not be pushed out, and the rolling door 424 can always cover the front end opening between the two box side plates 423.

The housing back 421 is further provided with a pushing mechanism 426 for pushing the paraffin block 20 forward. The push-out mechanism 426 may be a combination of a telescopic ram and a push plate. The telescopic cylinder of the push-out mechanism 426 may be set to a multistage telescopic cylinder as needed, and the extension length thereof may be increased. The telescopic cylinder of the push-out mechanism 426 may be mounted on the rear surface of the case back 421, and a groove is provided on the front surface of the case back 421 to accommodate the push plate, as needed. The piston rod of the telescopic oil cylinder is connected with the push plate. The ejector mechanism 426 is actuated by a control system.

The front end of the case side plate 423 is substantially adjacent to the front side edge of the bracket bottom plate 411, and the front side edge of the bracket bottom plate 411 is provided with a guide slope 4111 for guiding the pushed-out paraffin block 20 to slide down into the goaf 18.

Referring to fig. 27-30, motor 4273 is first turned on to wind up cable 4271, and cable 4271 pulls shutter door 424 downward until it passes through strip opening 4114, at which time shutter door 424 closes the front opening between two box side panels 423. The wax liquid 10 is then supplied to the wax filling tank 42. After the wax filling tank 42 is filled with the wax liquid 10, the filling is stopped, and the wax liquid 10 is left to stand until the wax liquid is solidified into a wax block 20. Thereafter, the motor 4273 rotates in the reverse direction to release the cable 4271, and the roller door 424 is lifted up and wound around the roller shaft 4212 by the torsion spring, opening the front end opening between the two case side plates 423.

The box side plate 423 is then pulled by the push-pull mechanism 425 to separate it from the paraffin block 20.

The paraffin block 20 is pushed forward by the push-out mechanism 426, and passes through the front end opening between the two box side plates 423. The paraffin block 20 slides down the guide slope 4111 into the front goaf 18.

In practice, if the paraffin block 18 is blocked and does not separate from the guide slope 4111, the paraffin block 18 will also separate from the guide slope 4111 and fall into the goaf 18 completely when the hydraulic bracket 41 moves backward. The ideal scheme is that the front paraffin block 18 and the rear paraffin block 18 are close together, and in the actual process, the front paraffin block 18 and the rear paraffin block 18 are separated by a little distance, so that the experimental effect is not affected. In addition, since there is a layer of wax on the floor of the simulated box floor 11 or the floor of the goaf 18, the paraffin block 18 slides forward smoothly when it is separated from the guide slope 4111 to approach or come close to the paraffin block 18 in front.

In one embodiment, as shown in fig. 19-23, the case back 421 includes a back fixing plate 4211 fixedly connected to the bracket base 411, a back lifting plate 4212 slidably connected to the back fixing plate 4211, and a back lifting actuation mechanism 4213 connected between the back lifting plate 4212 and the back fixing plate 4211.

The case side plate 423 includes a side plate fixing plate 4231 slidably connected to the bracket bottom plate 411, a side plate lifting plate 4232 slidably connected to the side plate fixing plate 4231, and a side plate lifting actuation mechanism 4233 connected between the side plate lifting plate 4232 and the side plate fixing plate 4231.

The side plate fixing plate 4231 is slidably connected to the back plate fixing plate 4211, the side plate lifting plate 4232 is slidably connected to the back plate lifting plate 4212, the case top plate 422 is fixedly connected to the back plate lifting plate 4212, and the side plate lifting plate 4232 is slidably connected to the case top plate 422.

The filling tank inlet 420 is provided on the back plate lifting plate 4212, and the push-out mechanism 426 is connected to the back plate fixing plate 4211.

In this embodiment, the box back plate 421 and the box side plate 423 all adopt lifting structures, and the box top plate 422 can be lifted along with the lifting, so that paraffin blocks 20 with different heights can be formed to meet different filling requirements.

Specifically, the case back 421 includes a back fixing plate 4211 and a back lifting plate 4212 and a back lifting actuation mechanism 4213. The back plate fixing plate 4211 and the bracket bottom plate 411, and the back plate lifting plate 4212 and the back plate fixing plate 4211 are slidably connected and kept sealed. The back plate lifting actuating mechanism 4213 is connected to the back plate fixing plate 4211 and the back plate lifting plate 4212 at the outer side (rear side) for driving the back plate lifting plate 4212 to lift. The back plate lift actuator 4213 may employ lift cylinders that are actuated by a control system.

The case top plate 422 is fixedly connected to the back plate lifting plate 4212, and can be lifted and lowered together with the back plate lifting plate 4212. The filling tank inlet 420 is provided on the back plate lifting plate 4212, and the push-out mechanism 426 is connected to the back plate fixing plate 4211.

The case side plate 423 includes a side plate fixing plate 4231, a side plate lifting plate 4232, and a side plate lifting actuation mechanism 4233. The side plate fixing plate 4231 is slidably connected and sealed with the bracket bottom plate 411 and the back plate fixing plate 4211, respectively, and the side plate fixing plate 4231 is slidable in the width direction. The side plate lifting plate 4232 is slidably connected to and sealed from the side plate fixing plate 4231, and the side plate lifting plate 4232 is slidable up and down with respect to the side plate fixing plate 4231. The side plate lifting plate 4232 is also slidably connected and sealed to the back plate lifting plate 4212 and the box top plate 422, and the side plate lifting plate 4232 is slidable in the width direction with respect to the back plate lifting plate 4212. The side plate lifting/lowering actuator 4233 is connected to the outer sides of the side plate lifting/lowering plate 4232 and the side plate fixing plate 4231, and is used for driving the side plate lifting/lowering plate 4232 to lift and lower. The side plate lift actuator 4233 may employ lift cylinders that are actuated by a control system.

The number and positions of the back plate lifting actuator 4213 and the side plate lifting actuator 4233 can be set as needed. The number and positions of the pushing mechanisms 426 may be set as desired.

In one embodiment, as shown in fig. 1 to 6 and 8, the simulation experiment apparatus includes a hot water supply tank 7, and a water supply pump 71 is provided in the hot water supply tank 7.

A wall water cavity 311 is arranged in the wall 31 of the wax liquid recovery tank 3, and a thermometer is arranged in the wall water cavity 311. The water supply pump 71 is connected to the wall water chamber 311 through a first water supply pipe 72.

When the wax liquid 10 is recovered in the wax liquid recovery tank 3, the wall water chamber 311 is filled with the hot water 70.

In the present embodiment, the hot water supply tank 7 is configured to supply hot water. The hot water supply tank 7 may be a water heater or may be a boiler. The water temperature of the hot water is determined by the melting point of the paraffin, and is generally about 5-10 ℃ higher than the melting point of the paraffin. The hot water supply tank 7 is provided with a water supply pump 71 for supplying hot water to the outside.

The wall 31 of the wax liquid recovery tank 3 is provided with a wall water cavity 311, the top of which is provided with a water inlet 312, the bottom of which is provided with a water outlet 313, and the inside of which is provided with a thermometer. The water outlet 313 is provided with an electric control valve which is controlled by a control system and is automatically opened and closed. The thermometer is used to monitor the water temperature in the tank wall water chamber 311. The water supply pump 71 is connected to the water inlet 312 through the first water supply pipe 72. The water discharged from the water discharge port 313 can be transferred to the boiler through a pipe for reuse.

When the wax liquid 10 is recovered by the wax liquid recovery tank 3, the hot water 70 is filled in the tank wall water cavity 311 to ensure that the wax liquid 10 in the wax liquid recovery tank 3 is not solidified.

In one embodiment, as shown in fig. 1 to 6 and 9 to 10, a pipe wall water chamber 211 is provided in the pipe wall of the insulating sleeve 21, and a water supply pump 71 is connected to the pipe wall water chamber 211 through a second water supply pipe 73.

The pipe wall cavity 211 is filled with hot water 70 as the simulated production pulls the insulating sleeve 21 backward.

In this embodiment, a pipe wall water cavity 211 is provided in the pipe wall of the insulating sleeve 21, and has a water inlet and a water outlet, and an electric control valve is provided in the water outlet, and is controlled by a control system to automatically switch. The water discharged from the water outlet can be transferred to the boiler through a pipeline for reuse.

The water supply pump 71 is connected to the water inlet of the pipe wall water chamber 211 through the second water supply pipe 73. When the simulated exploitation pulls the insulating sleeve 21 backwards, the pipe wall water cavity 211 is filled with hot water 70 so as to slowly heat paraffin around the insulating sleeve 21 to soften the paraffin, so that the insulating sleeve 21 is pushed and pulled, and the phenomenon that the paraffin-like coal seam 14 is damaged due to hard pushing and pulling of the insulating sleeve 21 can be effectively avoided.

The above technical schemes can be combined according to the need to achieve the best technical effect.

The foregoing is only illustrative of the principles and preferred embodiments of the present invention. It should be noted that several other variants are possible to those skilled in the art on the basis of the principle of the invention and should also be considered as the scope of protection of the present invention.

Claims

1. The simulation experiment device for simulating coal mining and filling is characterized by comprising a simulation box, a heating electrode mechanism, a wax liquid recovery box and a filling bracket mechanism;

2. A simulation experiment apparatus for simulating coal mining and filling according to claim 1, wherein a driving mechanism for driving the insulating sleeve to move is mounted on the rear side plate;

3. A simulation experiment device for simulating coal mining and filling according to claim 1, wherein a pushing mechanism is connected between the bracket bottom plate and the front side plate;

4. A simulation experiment apparatus for simulating coal mining and filling according to claim 3, wherein a protective sleeve is provided in the externally threaded sleeve, the protective sleeve being mounted in the externally threaded sleeve by a bearing, the wax liquid supply pipe passing through the protective sleeve.

5. A simulation experiment apparatus for simulating coal mining and filling according to claim 3, wherein the pushing mechanism includes two of the second female sleeves, two of the fixed sleeves, and two of the male sleeves;

6. A simulation experiment apparatus for simulating coal mining and filling according to claim 3, wherein a receiving groove for receiving the filling bracket mechanism is provided on a side of the front side plate facing the rear side plate, and a lifting door is provided on an opening of the receiving groove on a side facing the rear side plate;

7. A simulation modeling apparatus for simulating coal mining and filling according to claim 1, wherein the paraffin filling box includes a box back plate, a box top plate, and two box side plates;

8. A simulation modeling experiment apparatus for simulating coal mining and filling according to claim 7, wherein the tank back plate includes a back plate fixing plate fixedly connected to the bracket bottom plate, a back plate lifting plate slidingly connected to the back plate fixing plate, and a back plate lifting actuation mechanism connected between the back plate lifting plate and the back plate fixing plate;

9. A simulation experiment apparatus for simulating coal mining and filling according to any one of claims 1-8, comprising a hot water supply tank having a water supply pump provided therein;

10. A simulation experiment device for simulating coal mining and filling according to claim 9, wherein a pipe wall water cavity is provided in a pipe wall of the insulating sleeve, and the water supply pump is connected with the pipe wall water cavity through a second water supply pipe;