Continuous fixed-point monitoring device for oxygen concentration and temperature at boundary of goaf in mining stopping period of coal mine

Abstract

The utility model relates to the technical field of goaf monitoring, and provides a continuous fixed-point monitoring device for goaf boundary oxygen concentration and temperature in a coal mine stopping period. In the device, a supporting unit comprises a plurality of hollow supporting pipelines which are connected in sequence, and a collecting cover is installed in the supporting unit in a sliding mode and can move in the axial direction of the supporting unit; the outer side wall of a shell structure of the collecting cover is matched with the inner side wall of the supporting pipeline, the side wall is hollowed out, and a measuring probe is installed on the bottom face and extends into the shell structure. One end of the supporting unit is connected with a winding unit, and the winding unit drives the collecting cover to move in the supporting unit in the axial direction. In this way, the measuring probe installed in the collecting cover is effectively protected through the supporting pipeline, and the measuring probe is prevented from being affected by coal gangue caving from a top plate in the measuring process; meanwhile, the winding unit drives the collecting cover to move along the supporting unit, so that the measuring probe is not limited to measurement of a fixed point position any more, and continuous fixed-point measurement of the boundary of the goaf can be achieved.

Description

Technical Field

[0001] This application relates to the technical field of gob monitoring, and particularly relates to a device for continuously and fixedly monitoring the oxygen concentration and temperature at the gob boundary during the coal mine stop mining period. Background Art

[0002] During the period of coal mine working face stop mining, coal winning, and dismantling and moving the support, due to reasons such as a significant reduction in the advancing speed and a significant increase in the amount of residual coal, spontaneous combustion fires are extremely likely to occur in the gob. During the stop mining period, the main influencing factors of spontaneous combustion fires show characteristics such as a gradual reduction in the advancing speed, a gradual increase in the thickness of residual coal, and a significant increase in the stop mining time. As a result, the "spontaneous combustion" three-zone distribution of the gob obtained through observation under normal advancement will no longer be applicable. Especially as the stop mining and moving time increases, the oxygen in the oxidation zone is rapidly consumed, the temperature rises rapidly, the high-temperature points gradually move forward, causing the heat dissipation zone to rapidly narrow, making the commonly used fire prevention measures ineffective or malfunction. Summary of the Invention

[0003] The purpose of this application is to provide a device for continuously and fixedly monitoring the oxygen concentration and temperature at the gob boundary during the coal mine stop mining period to solve or alleviate the problems existing in the above-mentioned prior art.

[0004] To achieve the above purpose, this application provides the following technical solutions:

[0005] This application provides a device for continuously and fixedly monitoring the oxygen concentration and temperature at the gob boundary during the coal mine stop mining period, including: a support unit, including a plurality of hollow support pipes connected in sequence; a collection cover, the collection cover is slidably installed in the support unit and can move axially along the support unit. The collection cover is a shell structure, the outer side wall of the shell structure matches the inner side wall of the support pipe, and the side wall of the shell structure is hollowed out, and a measurement probe is installed on the bottom surface, and the measurement probe extends into the shell structure; a wire winding unit, installed at one end of the support unit, for driving the collection cover to move axially in the support unit.

[0006] Preferably, two adjacent support pipes are connected by an I-shaped connecting plate; wherein, T-shaped installation grooves are respectively arranged at both ends of the outer side wall of each support pipe, and both ends of the I-shaped connecting plate are respectively located in the T-shaped installation grooves arranged at the ends of two adjacent support pipes.

[0007] Preferably, 2 positioning holes are respectively arranged at the end faces of each support pipe, and positioning pins are installed in the corresponding positioning holes at the ends of two adjacent support pipes.

[0008] Preferably, a dovetail-shaped chute penetrating axially is provided on the inner side wall of the support pipe; correspondingly, a dovetail-shaped slide rail is provided on the outer side wall of the collection cover, and the dovetail-shaped slide rail is slidably installed in the dovetail-shaped chute.

[0009] Preferably, the winding unit drives the collection cover to move axially in the support unit through a rope; wherein, one end of the rope passes around a driving rope pulley installed on the winding unit and is connected to one end of the collection cover facing the winding unit, and the other end of the rope passes around a driven rope pulley installed at one end of the support unit far from the winding unit and is connected to the other end of the collection cover facing away from the winding unit.

[0010] Preferably, an end cover is installed at one end of the support unit far from the winding unit, an installation ear plate is provided on the bottom surface of the end cover, and the driven rope pulley is rotatably installed on the installation ear plate.

[0011] Preferably, the installation ear plate is in adaptive contact with the inner side wall of the support pipe; and / or, a positioning block is further provided on the bottom surface of the installation ear plate, and the positioning block is in adaptive contact with the inner side wall of the support pipe.

[0012] Preferably, a gear transmission mechanism is provided on the winding unit, the driving gear of the gear transmission mechanism drives the driving rope pulley to rotate coaxially, and the driven gear of the gear transmission mechanism drives the winding drum to rotate coaxially; wherein, the winding drum is used for winding the signal transmission line connected to the measurement probe; the ratio of the effective winding diameters of the driving rope pulley and the winding drum is reciprocal to the transmission ratio of the driving gear and the driven gear.

[0013] Preferably, the winding unit drives the winding drum to wind the signal transmission line of the measurement probe through a gear transmission mechanism, and the winding drum is coaxially installed with the driving rope pulley, and the effective winding diameters of the driving rope pulley and the winding drum are the same.

[0014] Preferably, a positioning element is further installed in the housing structure of the collection cover for real-time positioning of the collection cover; and / or, positioning scale marks are further provided on the rope.

[0015] Beneficial effects:

[0016] In the device for continuously and fixedly monitoring the oxygen concentration and temperature at the goaf boundary during the coal mine stop - mining period provided by the embodiments of the present application, the support unit includes a plurality of hollow support pipes connected in sequence. A collection cover is slidably installed within the support unit, and the collection cover can move axially along the support unit; the collection cover is of a shell structure, the outer sidewall of the shell structure matches the inner sidewall of the support pipe, and the sidewall of the shell structure is hollowed out, and a measurement probe is installed on the bottom surface, and the measurement probe extends into the shell structure; a wire - winding unit is connected to one end of the support unit for driving the collection cover to move axially within the support unit.

[0017] Thereby, the measurement probe installed within the collection cover is effectively protected by the support pipe, avoiding being affected by the coal gangue falling from the roof during the measurement process; at the same time, by driving the collection cover to move along the support unit through the wire - winding unit, the measurement probe is no longer limited to measuring at a fixed point, and continuous fixed - point measurement of the goaf boundary can be realized.

[0018] During the measurement process, the outer sidewall of the collection cover matches the inner sidewall of the support pipe, so that the measurement of external temperature, oxygen concentration, etc. can only enter the collection cover through the hollow structures on the support pipe and the collection cover, and the measurement probe located within the shell structure of the collection cover can effectively measure the external temperature, oxygen concentration, etc., minimizing the influence from other regions during the measurement process. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The schematic diagrams in the specification, which form a part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation to this application.

[0020] Wherein:

[0021] Figure 1 is an assembly schematic diagram of a device for continuously and fixedly monitoring the oxygen concentration and temperature at the goaf boundary during the coal mine stop - mining period according to some embodiments of the present application;

[0022] Figure 2 is Figure 1 an assembly schematic diagram of the collection cover and the support pipe in the illustrated embodiment;

[0023] Figure 3 is a structural schematic diagram of the support pipe according to some embodiments of the present application;

[0024] Figure 4 is a structural schematic diagram of the I - shaped connecting plate according to some embodiments of the present application;

[0025] Figure 5 is an axonometric schematic diagram of the collection cover according to some embodiments of the present application;

[0026] Figure 6For Figure 5 Another axonometric view of the collection cover shown;

[0027] Figure 7 Assembly diagram of the end cover and the driven rope pulley provided according to some embodiments of the present application;

[0028] Figure 8 Axonometric view of the winding unit provided according to some embodiments of the present application;

[0029] Figure 9 Axonometric view of the winding unit with the driving gear and the driving rope pulley coaxially installed provided according to some embodiments of the present application;

[0030] Figure 10 Integrated diagram of the winding drum and the driving rope pulley provided according to some embodiments of the present application.

[0031] Explanation of reference numerals:

[0032] 100, support unit; 200, winding unit; 300, collection cover;

[0033] 101, support pipe; 102, I-shaped connecting plate; 103, end cover; 111, T-shaped installation groove; 121, dovetail-shaped sliding groove; 113, installation ear plate; 123, driven rope pulley; 133, positioning block;

[0034] 201, driving gear; 202, driven gear; 203, driving rope pulley; 204, winding drum;

[0035] 301, cover body; 302, cover plate; 303, connecting ring; 311, dovetail-shaped sliding rail; 321, through rope hole; 312, probe installation hole; Detailed implementation manners

[0036] The present application will be described in detail below with reference to the drawings and in conjunction with embodiments. Each example is provided by way of explanation of the present application rather than limiting the present application. In fact, those skilled in the art will clearly understand that modifications and variations can be made to the present application without departing from the scope or spirit of the present application. For example, features shown or described as part of one embodiment can be used in another embodiment to yield yet another embodiment. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention shall fall within the scope of protection of the embodiments of the present invention.

[0037] Under the existing coal mining conditions, the traditional temperature and gas measurement in the working face are mostly carried out separately. Usually, multiple fixed monitoring points need to be arranged, which not only wastes materials and is inconvenient for construction, but also can only be used for fixed monitoring and cannot achieve continuous fixed-point monitoring. In addition, the caved coal gangue in the goaf will also cause short circuits, open circuits, etc., resulting in the interruption of monitoring.

[0038] Based on this, the embodiment of the present application provides a continuous fixed-point monitoring device for the oxygen concentration and temperature at the goaf boundary during the coal mine stop mining period, as Figures 1 to 10 shown. In this continuous fixed-point monitoring device, the support unit 100 includes a plurality of hollow support pipes 101 connected in sequence. A collection cover 300 is slidably installed in the support unit 100, and the collection cover 300 can move axially along the support unit 100; the collection cover 300 is of a shell structure, the outer side wall of the shell structure matches the inner side wall of the support pipe 101, and the side wall of the shell structure is hollowed out, and a measurement probe is installed on the bottom surface and extends into the shell structure; a winding unit 200 is connected to one end of the support unit 100 for driving the collection cover 300 to move axially in the support unit 100.

[0039] The support pipe 101 effectively protects the measurement probe installed in the collection cover 300, avoiding the influence of the caved coal gangue from the roof during the measurement process. Among them, two adjacent support pipes 101 are connected by an I-shaped connecting plate 102; among them, T-shaped installation grooves 111 are respectively arranged at both ends of the outer side wall of each support pipe 101, and both ends of the I-shaped connecting plate 102 are respectively located in the T-shaped installation grooves 111 arranged at the ends of two adjacent support pipes 101.

[0040] Specifically, threaded blind holes are provided on the bottom surface of the T-shaped installation groove 111, and the I-shaped connecting plate 102 is fixedly connected to the T-shaped installation groove 111 through fastening bolts; through the cooperation of the T-shaped installation groove 111 and the T-shaped structure of the I-shaped connecting plate 102, two adjacent support pipes 101 are fixed together axially. Among them, 2 T-shaped installation grooves 111 are symmetrically arranged at both ends of the outer side wall of each support pipe 101 to further strengthen the fixed connection between two adjacent support pipes 101. During the connection of two adjacent support pipes 101, the installation fixed position of the two support pipes 101 is realized through a positioning pin. Among them, 2 positioning holes are symmetrically arranged on the end surface of each support pipe 101, and positioning pins are installed in the corresponding positioning holes at the ends of two adjacent support pipes 101.

[0041] The collection cover 300 moves axially within the support unit 100, and the gap between the outer sidewall of the collection cover 300 and the inner sidewall of the support pipe 101 is less than or equal to 0.05 mm. Thereby, it effectively avoids the situation where the measurement of external temperature, oxygen concentration, etc. can only enter the collection cover 300 through the hollow structures on the support pipe 101 and the collection cover 300, and the measurement probe located within the housing structure of the collection cover 300 can effectively measure the external temperature, oxygen concentration, etc., and minimizes the influence from other areas during the measurement process.

[0042] Specifically, the inner sidewall of the support pipe 101 is provided with a dovetail-shaped chute 311121 penetrating axially, and the outer sidewall of the collection cover 300 is provided with a dovetail-shaped slide rail, and the dovetail-shaped slide rail is slidably installed within the dovetail-shaped chute 311121. Among them, two dovetail-shaped chutes 311121 are symmetrically arranged on the inner sidewall of the support pipe 101, and two matching dovetail-shaped slide rails are symmetrically arranged on the outer sidewall of the collection cover 300. Through the dovetail-shaped structure, it effectively ensures that the collection cover 300 and the support pipe 101 are coaxial, enables the effective matching between the outer sidewall of the collection cover 300 and the inner sidewall of the support pipe 101, and avoids the mutual friction between the outer sidewall of the collection cover 300 and the inner sidewall of the support pipe 101.

[0043] In this application, the winding unit 200 drives the collection cover 300 to move axially within the support unit 100 through a tensioned rope (such as a steel wire rope). One end of the rope passes around the driving rope wheel 203 installed on the winding unit 200 and is connected to one end of the collection cover 300 facing the winding unit 200, and the other end of the rope passes around the driven rope wheel 123 installed at one end of the support unit 100 away from the winding unit 200 and is connected to the other end of the collection cover 300 facing away from the winding unit 200. Among them, an end cover 103 is installed at one end of the support unit 100 away from the winding unit 200, and an installation ear plate 113 is provided on the bottom surface of the end cover 103, and the driven rope wheel 123 is rotatably installed on the installation ear plate 113.

[0044] Meanwhile, through holes 321 are respectively provided at both ends of the collection cover 300. After the rope passes through the through holes, it bypasses the driving rope pulley 203 and the driven rope pulley 123 and is connected to both ends of the collection cover 300. Specifically, the collection cover 300 includes a cover body 301 and a cover plate 302. The cover body 301 is a barrel-shaped structure with one end open. A threaded counterbore is provided at the open end of the cover body 301, and the cover plate 302 is threadedly connected to the threaded counterbore. Threaded mounting holes are provided at the bottom plate of the barrel-shaped structure of the cover body 301. A connecting ring 303 is threadedly connected in the threaded mounting holes, and through holes 321 are provided at the bottom plate of the barrel-shaped structure of the cover body 301. Correspondingly, threaded mounting holes and through holes 321 with the same structure are also provided on the cover plate 302, and a plurality of probe mounting holes 312 are further provided on the cover plate 302. The probe mounting holes 312 are used to mount measurement probes. Among them, the measurement probes at least include an oxygen concentration measurement probe and a temperature measurement probe.

[0045] In a specific example, two mounting ear plates 113 are symmetrically arranged on the bottom surface of the end cover 103. Mounting holes for mounting a rotating pin shaft are provided on the two mounting ear plates 113, and the driven rope pulley 123 is rotatably mounted on the rotating pin shaft. The upper and lower ends of the mounting ear plate 113 are arc-shaped surfaces, which are respectively in adaptive contact with the inner side wall of the support pipe 101. At the same time, a positioning block 133 is further provided on the bottom surface of the mounting ear plate 113, and the positioning block 133 is in adaptive contact with the inner side wall of the support pipe 101. That is to say, two positioning blocks 133 with a dovetail cross-section are symmetrically arranged in the vertical direction between the two mounting ear plates 113. The positioning blocks 133 with a dovetail cross-section are adapted to the dovetail-shaped chute 311121 on the support pipe 101. Thereby, the positioning connection between the end cover 103 and the support pipe 101 is realized, so that the driven rope pulley 123 is located on the axial middle plane of the support unit 100, ensuring the smooth movement of the collection cover 300 along the support pipe 101 driven by the rope, and avoiding the friction between the collection cover 300 and the support pipe 101 caused by eccentric loading.

[0046] In this application, the winding unit 200 drives the collection cover 300 to move along the axis of the support unit 100 through a rope. Among them, a gear transmission mechanism is provided on the winding unit 200, which drives the driving rope pulley 203 and the winding drum 204 to rotate simultaneously. The friction between the driving rope pulley 203 and the rope drives the rope to move, and then drives the collection cover 300 to move along the axis of the support unit 100, so that the measurement probes mounted on the collection cover 300 move, and the signal transmission lines connected to the measurement probes are simultaneously payed out or rewound on the winding drum 204.

[0047] In a specific example, the driving gear 201 of the gear transmission mechanism drives the driving rope pulley 203 to rotate coaxially; the driven gear 202 of the gear transmission mechanism drives the wire winding drum 204 to rotate coaxially. The wire winding drum 204 is used to wind the signal transmission line connected to the measuring probe. The ratio of the effective winding diameters of the driving rope pulley 203 and the wire winding drum 204 is the reciprocal of the transmission ratio of the driving gear 201 and the driven gear 202. That is to say, the driving gear 201 and the driving rope pulley 203 are coaxially installed, and the wire winding drum 204 and the driven gear 202 are coaxially installed. When the driving gear 201 rotates, it drives the driving rope pulley 203 and the wire winding drum 204 to rotate simultaneously.

[0048] When the transmission ratio of the driving gear 201 and the driven gear 202 of the gear transmission mechanism is 1:1, the effective winding diameters of the driving rope pulley 203 and the wire winding drum 204 are the same. That is to say, the winding diameter of the rope on the driving rope pulley 203 is the same as the winding diameter of the signal transmission line on the wire winding drum 204; when the transmission ratio of the driving gear 201 and the driven gear 202 of the gear transmission mechanism is not 1:1, the ratio of the effective winding diameters of the driving rope pulley 203 and the wire winding drum 204 is equal to the reciprocal of the transmission ratio. That is to say, when the transmission ratio of the driving gear 201 and the driven gear 202 is 1:n (n is a positive integer), the ratio of the effective winding diameters of the driving rope pulley 203 and the wire winding drum 204 is equal to n:1; when the transmission ratio of the driving gear 201 and the driven gear 202 is n:1, the ratio of the effective winding diameters of the driving rope pulley 203 and the wire winding drum 204 is equal to 1:n. Thereby, the synchronous movement of the rope and the signal transmission line is effectively ensured.

[0049] In another specific example, the winding unit 200 drives the wire winding drum 204 to wind the signal transmission line of the measuring probe through the gear transmission mechanism. The wire winding drum 204 and the driving rope pulley 203 are coaxially installed, and the effective winding diameters of the driving rope pulley 203 and the wire winding drum 204 are the same. Among them, the wire winding drum 204 and the driving rope pulley 203 can be integrally formed or a split connection structure. When the wire winding drum 204 and the driving rope pulley 203 are integrally formed, they are connected to the driven gear 202 of the gear transmission mechanism, and the driving rope pulley 203 is located in the middle of the wire winding drum 204. Thereby, when the driving gear 201 of the gear transmission mechanism rotates, driven by the driven gear 202, the wire winding drum 204 and the driving rope pulley 203 rotate simultaneously, and the temperature signal transmission line and the oxygen concentration signal transmission line can be wound on the wire winding drum on both sides of the driving rope pulley 203 respectively.

[0050] In this application, a positioning element is also installed inside the housing structure of the collection cover 300, such as a positioning card (model number KJ236-K1) or a mine wireless coding transmitter (such as model number KGE37B), which is used to perform real-time positioning on the collection cover 300 to determine the specific position of the collection cover 300 in the support unit 100. At the same time, positioning scale marks can also be set on the rope, and the position of the collection cover 300 can be determined physically by the change of the positioning scale marks on the rope.

[0051] During the signal acquisition process, the driving gear 201 of the gear transmission mechanism on the winding unit 200 rotates, driving the driven gear 202 and the driving rope pulley 203 to rotate synchronously, pulling the collection cover 300 in the support unit 100 to move axially, and using the positioning element or the positioning scale marks to perform digital positioning and / or physical positioning on the position of the collection cover 300; the oxygen concentration measurement probe and the temperature measurement probe installed in the collection cover 300 are used to monitor the oxygen concentration and temperature at the positioning position in real time, and the collected signals are output to the digital display instrument through the signal transmission line, and the digital display instrument receives and displays the temperature value and oxygen concentration value at the positioning position.

[0052] Thereby, the real-time and continuous monitoring of the temperature, oxygen concentration, etc. in the goaf is realized, which is no longer restricted by fixed measurement points, and the operation is simple, fast and more accurate; through the temperature and oxygen concentration of the continuously positioned points collected in real time, the temperature state of the residual coal behind the goaf and the division of the "three zones" are made more accurate, eliminating the process of laying bundle tubes by workers in the goaf working face and manually measuring and sampling the gas in the underground working face, reducing the labor intensity of workers, and reducing the consumption of materials and equipment, significantly improving the overall economic benefits.

[0053] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0054] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0055] In the present invention, unless otherwise clearly defined and limited, terms such as "mounted", "connected", "coupled", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention may be understood according to specific circumstances.

[0056] In the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0057] In the present invention, terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0058] The above are only the preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A device for continuous fixed-point monitoring of oxygen concentration and temperature at the boundary of goaf during the mining suspension period of a coal mine, characterized in that: include: A support unit, comprising a plurality of hollow support pipes connected in sequence; A collection cover, which is slidably installed in the support unit and can move along the axial direction of the support unit. The collection cover is a shell structure, the outer side wall of the shell structure matches the inner side wall of the support pipe, and the side wall of the shell structure is hollowed out, and a measuring probe is installed on the bottom surface, and the measuring probe extends into the shell structure; The winding unit is installed at one end of the supporting unit and is used to drive the collecting cover to move axially in the supporting unit.

2. The device for continuous fixed-point monitoring of oxygen concentration and temperature at the boundary of goaf during the suspension period of coal mining according to claim 1 is characterized in that: Two adjacent support pipes are connected by an I-shaped connecting plate; wherein, both ends of the outer wall of each support pipe are respectively provided with T-shaped mounting grooves, and both ends of the I-shaped connecting plate are respectively located in the T-shaped mounting grooves provided at the ends of the two adjacent support pipes.

3. The device for continuous fixed-point monitoring of oxygen concentration and temperature at the boundary of goaf during the suspension period of coal mining according to claim 1, characterized in that: The end surface of each supporting pipe is respectively provided with two positioning holes, and positioning pins are installed in the positioning holes corresponding to the ends of two adjacent supporting pipes.

4. The device for continuous fixed-point monitoring of oxygen concentration and temperature at the boundary of goaf during the suspension period of coal mining according to claim 1, characterized in that: The inner side wall of the support pipe is provided with a dovetail type slide groove penetrating along the axial direction; Correspondingly, the outer side wall of the collection cover is provided with a dovetail slide rail, and the dovetail slide rail is slidably installed in the dovetail slide groove.

5. The device for continuous fixed-point monitoring of oxygen concentration and temperature at the boundary of goaf during the suspension period of coal mining according to claim 1, characterized in that: The winding unit drives the collection cover to move axially in the supporting unit through the rope; Among them, one end of the rope passes around the active rope pulley installed on the winding unit and is connected to the end of the collecting cover facing the winding unit, and the other end of the rope passes around the driven rope pulley installed on the end of the supporting unit away from the winding unit and is connected to the end of the collecting cover facing away from the winding unit.

6. The device for continuous fixed-point monitoring of oxygen concentration and temperature at the boundary of goaf during the suspension period of coal mining according to claim 5, characterized in that: An end cover is installed at one end of the supporting unit away from the winding unit, and a mounting ear plate is provided on the bottom surface of the end cover, and the driven rope pulley is rotatably mounted on the mounting ear plate.

7. The device for continuous fixed-point monitoring of oxygen concentration and temperature at the boundary of goaf during the suspension period of coal mining according to claim 6, characterized in that: The mounting ear plate is in adaptive contact with the inner side wall of the supporting pipe; and / or, The bottom surface of the mounting ear plate is also provided with a positioning block, and the positioning block is adapted to contact with the inner side wall of the supporting pipe.

8. The device for continuous fixed-point monitoring of oxygen concentration and temperature at the boundary of goaf during the suspension period of coal mining according to claim 5, characterized in that: The winding unit is provided with a gear transmission mechanism, wherein the driving gear of the gear transmission mechanism coaxially drives the driving rope pulley to rotate, and the driven gear of the gear transmission mechanism coaxially drives the winding drum to rotate; wherein the winding drum is used to wind the signal transmission line connected to the measuring probe; the effective winding diameter ratio of the driving rope pulley and the winding drum is inversely proportional to the transmission ratio of the driving gear and the driven gear.

9. The device for continuous fixed-point monitoring of oxygen concentration and temperature at the boundary of goaf during the suspension period of coal mining according to claim 5, characterized in that: The winding unit drives the winding drum to wind the signal transmission line of the measuring probe through a gear transmission mechanism, and the winding drum is coaxially installed with the driving rope wheel, and the effective winding diameters of the driving rope wheel and the winding drum are the same.

10. The device for continuous fixed-point monitoring of oxygen concentration and temperature at the boundary of goaf during the suspension period of coal mining according to claim 5, characterized in that: A positioning element is also installed in the shell structure of the collection cover, which is used to position the collection cover in real time; and / or, The rope is also provided with positioning scale marks.

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