Grinding type coal rock gas generating device

Abstract

The utility model discloses a grinding type coal rock gas generating device which comprises a box body frame, and a lifting supporting unit, a grinding driving unit, an upper clamping unit, a lower clamping unit, an upper grinding convex rod, a lower grinding concave rod, a middle clamping unit, a gas collecting unit and a temperature control unit are arranged in the box body frame. The coal rock grinding device is scientific in principle, simple in structure, easy to install and good in sealing performance, coal rocks are ground in a sealed environment, meanwhile, temperature control in the grinding process is achieved, and therefore the accuracy of coal rock grinding test data is improved, gas generated in the coal rock grinding process can be collected, and the coal rock grinding efficiency is improved. Therefore, a reference basis is provided for researching the abrasiveness of the coal rock.

Description

Technical Field

[0001] This utility model belongs to the field of particle grinding technology, specifically relating to a grinding coal and rock gas generator. Background Technology

[0002] Grinding is the process of grinding granular materials into powder by friction on a grinding tool. Grinding is also a finishing process performed on the workpiece by the relative motion between the grinding tool and the workpiece under certain pressure. Grinding can be used for friction processing to process materials into powder, such as soft rock powder, coal powder, etc.

[0003] Coal petrography is usually used as a unit for dividing coal seams. It is a classification based on the average luster intensity of coal of the same metamorphic degree when observed with the naked eye. According to the average luster intensity, it is divided into four categories: bright coal, semi-bright coal, semi-dull coal, and dull coal.

[0004] During the grinding process of coal and rock, gas is generated. It is necessary to collect the gas and test its composition in order to conduct in-depth research on the coal and rock. Currently, grinding experiments are generally carried out in the air and do not have the function of collecting gas. Utility Model Content

[0005] In order to solve the above-mentioned technical problems, the purpose of this utility model is to provide a grinding coal and rock gas generator that is easy to install and disassemble, has good sealing performance, and is easy to operate.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a grinding coal and rock gas generator, comprising a box frame, wherein the box frame is provided with a lifting support unit, a grinding drive unit, an upper clamping unit, a lower clamping unit, an upper grinding convex rod, a lower grinding concave rod, a middle clamping unit, a gas collecting unit, and a temperature control unit. The lower end of the lifting support unit is located at the bottom of the box frame, and the upper end of the grinding drive unit is located at the top of the box frame. The lower part of the lower grinding concave rod is fastened to the upper part of the lifting support unit by the lower clamping unit, and the upper part of the upper grinding convex rod is fastened to the lower part of the grinding drive unit by the upper clamping unit. The upper end face of the lower grinding concave rod is provided with a grinding groove, and the lower end of the upper grinding convex rod is provided with a grinding head extending into the grinding groove. The gas collecting unit is sleeved and sealed on the lower outer circle of the upper grinding convex rod and the upper outer circle of the lower grinding concave rod. The temperature control unit is located outside the gas collecting unit, and the middle clamping unit is located in the middle of the side wall of the box frame for clamping the temperature control unit and the gas collecting unit.

[0007] The lifting support unit includes at least two first electric push rods fixed at the bottom of the box frame. Each first electric push rod is equipped with a pressure sensor. A moving disk is horizontally provided at the upper end of the first electric push rod. A lower positioning column is vertically provided at the center of the moving disk. The lower end of the lower grinding concave rod is coaxially connected with the upper end of the lower positioning column.

[0008] The lower clamping unit includes a first upper clamping ring, a first lower clamping ring, and a first double-cone sleeve. The first double-cone sleeve is a sleeve structure that is thicker in the middle, thinner at both ends, and open at both ends. A lower expansion joint is formed along the axial direction of the first double-cone sleeve. The first double-cone sleeve is coaxially fitted onto the upper part of the lower positioning post and the lower part of the lower grinding concave rod. The first upper clamping ring is coaxially fitted onto the upper part of the first double-cone sleeve, and the first lower clamping ring is coaxially fitted onto the lower part of the first double-cone sleeve. Several... A first locking bolt is vertically positioned, with its upper part passing through the first upper clamping ring from top to bottom. The lower part of the first locking bolt is threadedly connected to the first lower clamping ring. Under the tightening action of the first locking bolt, the distance between the first upper clamping ring and the first lower clamping ring is shortened. The first upper clamping ring and the first lower clamping ring apply radial pressure to the first double-cone sleeve, reducing the lower expansion joint of the first double-cone sleeve. The upper and lower parts of the first double-cone sleeve respectively clamp the outer circle of the lower grinding concave rod and the outer circle of the lower positioning post.

[0009] The grinding drive unit includes a dynamic torque driver and an upper positioning column. The upper end of the dynamic torque driver is fixedly mounted on the top of the housing frame. The upper end of the upper positioning column is fixedly connected to the drive end of the dynamic torque driver. The center lines of the upper positioning column and the lower positioning column coincide. The upper end of the upper grinding protrusion is coaxially connected to the lower end of the upper positioning column.

[0010] The upper clamping unit includes a second upper clamping ring, a second lower clamping ring, and a second double-cone sleeve. The second double-cone sleeve is a sleeve structure that is thicker in the middle, thinner at both ends, and open at both ends. An upper expansion joint is formed along the axial direction of the second double-cone sleeve. The second double-cone sleeve is coaxially fitted onto the lower part of the upper positioning post and the upper part of the upper grinding protrusion. The second upper clamping ring is coaxially fitted onto the upper part of the second double-cone sleeve, and the second lower clamping ring is coaxially fitted onto the lower part of the second double-cone sleeve. Several... A second locking bolt is vertically positioned, with its lower part passing through the second lower clamping ring from bottom to top. The upper part of the second locking bolt is threadedly connected to the second upper clamping ring. Under the tightening action of the second locking bolt, the distance between the second upper clamping ring and the second lower clamping ring is shortened. The second upper clamping ring and the second lower clamping ring apply radial pressure to the second double-cone sleeve, reducing the lower expansion joint of the second double-cone sleeve. The upper and lower parts of the second double-cone sleeve respectively clamp the outer circle of the upper positioning post and the outer circle of the upper grinding protrusion.

[0011] The gas collection unit includes a top-and-bottom permeable sealing cylinder. The upper part of the inner wall of the sealing cylinder is provided with an upper sealing ring that seals with the outer circle of the upper grinding protrusion, and the lower part of the inner wall of the sealing cylinder is provided with a lower sealing ring that seals with the outer circle of the lower grinding concave rod. The upper and lower ends of the sealing cylinder are respectively provided with an upper annular protective cover and a lower annular protective cover. A gas collection pipe is connected to the middle of the sealing cylinder. A control valve is provided on the gas collection pipe, and a gas collection bag is connected to the outlet end of the gas collection pipe.

[0012] The temperature control unit includes a temperature controller and a temperature control strip. The temperature controller is connected to the temperature control strip via a wire. The temperature control strip is wrapped around the outer circumference of the sealed cylinder and can be detachably connected via Velcro.

[0013] The clamping unit includes a left clamp and a right clamp that are symmetrically arranged and have the same structure. The left clamp includes a second electric push rod. The left end of the second electric push rod is fixedly connected to the left side wall of the box frame. The right end of the second electric push rod is connected to a clamping block. The clamping block has an arc-shaped clamping opening, which is pressed against the temperature control belt.

[0014] By adopting the above technical solution, this utility model has the following technical effects: The sealing cylinder is fitted outside the lower grinding concave rod and the upper grinding convex rod, and sealed by the upper and lower sealing rings. The gas generated during the rotational grinding of coal and rock by the upper grinding convex rod can be collected into a gas collection bag through a gas collecting pipe. A temperature control belt is installed outside the sealing cylinder to regulate the temperature of the gas-generating environment during coal and rock grinding. The lower grinding concave rod is securely connected to the lower positioning column of the lifting support unit via a lower clamping unit, and the upper grinding convex rod is securely connected to the upper positioning column of the grinding drive unit via an upper clamping unit. Both the upper and lower clamping units employ an axial force applied by locking bolts to tighten the double-cone sleeve through clamping rings. The clamping connection is achieved by reducing the expansion joint on the double-cone sleeve. This structure is convenient to assemble, easy to disassemble, and reusable. The temperature control belt is wrapped around the outer circumference of the sealing cylinder with Velcro, and the middle clamping unit clamps the sealing cylinder, preventing it from rotating during the rotation of the upper grinding convex rod.

[0015] In summary, this utility model has a scientific principle, simple structure, is easy to install, and has good sealing performance. Coal and rock are ground in a sealed environment, and the temperature of the grinding process is controlled at the same time, thereby improving the accuracy of coal and rock grinding test data. The gas generated during the grinding process can also be collected, thus providing a reference for studying the grindability of coal and rock. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0017] Figure 2 This is a schematic diagram of the lifting support unit, grinding drive unit, and clamping unit in this utility model;

[0018] Figure 3 This is an exploded structural diagram of the upper clamping unit, lower clamping unit, upper grinding protrusion, and lower grinding concave rod in this utility model;

[0019] Figure 4 This is an exploded structural diagram of the gas collecting unit in this utility model;

[0020] Figure 5This is a schematic diagram of the temperature control unit in this utility model. Detailed Implementation

[0021] like Figures 1-5 As shown, the grinding coal and rock gas generator includes a housing frame 1. Inside the housing frame 1 are a lifting support unit 2, a grinding drive unit 3, an upper clamping unit 4, a lower clamping unit 5, an upper grinding protruding rod 6, a lower grinding concave rod 7, a middle clamping unit 8, a gas collection unit 9, and a temperature control unit 10. The lower end of the lifting support unit 2 is located at the bottom of the housing frame 1, and the upper end of the grinding drive unit 3 is located at the top of the housing frame 1. The lower part of the lower grinding concave rod 7 is fastened to the lifting support unit via the lower clamping unit 5. The upper grinding protrusion 6 is fastened to the lower part of the grinding drive unit 3 by the upper clamping unit 4. The upper end face of the lower grinding concave rod 7 is provided with a grinding groove 11. The lower end of the upper grinding protrusion 6 is provided with a grinding head 12 that extends into the grinding groove 11. The gas collection unit 9 is sleeved and sealed on the lower outer circle of the upper grinding protrusion 6 and the upper outer circle of the lower grinding concave rod 7. The temperature control unit 10 is located outside the gas collection unit 9. The middle clamping unit 8 is located in the middle of the side wall of the box frame 1 to clamp the temperature control unit 10 and the gas collection unit 9.

[0022] The lifting support unit 2 includes at least two first electric push rods 13 fixed at the bottom of the box frame 1. Each first electric push rod 13 is equipped with a pressure sensor. A moving disk 14 is horizontally provided at the upper end of the first electric push rod 13. A lower positioning post 15 is vertically provided at the center of the moving disk 14. The lower end of the lower grinding concave rod 7 is coaxially connected with the upper end of the lower positioning post 15.

[0023] The lower clamping unit 5 includes a first upper clamping ring 16, a first lower clamping ring 17, and a first double-cone sleeve 18. The first double-cone sleeve 18 is a sleeve structure that is thicker in the middle, thinner at both ends, and open at both ends. The first double-cone sleeve 18 has a lower expansion joint 19 along the axial direction. The first double-cone sleeve 18 is coaxially fitted onto the upper part of the lower positioning post 15 and the lower part of the lower grinding concave rod 7. The first upper clamping ring 16 is coaxially fitted onto the upper part of the first double-cone sleeve 18, and the first lower clamping ring 17 is coaxially fitted onto the lower part of the first double-cone sleeve 18. Several... A vertically positioned first locking bolt 20 is connected. The upper part of the first locking bolt 20 passes through the first upper clamping ring 16 from top to bottom, and the lower part of the first locking bolt 20 is threadedly connected to the first lower clamping ring 17. Under the tightening connection of the first locking bolt 20, the distance between the first upper clamping ring 16 and the first lower clamping ring 17 is shortened. The first upper clamping ring 16 and the first lower clamping ring 17 apply radial pressure to the first double-cone sleeve 18, and the lower expansion joint 19 of the first double-cone sleeve 18 is reduced. The upper and lower parts of the first double-cone sleeve 18 respectively clamp the outer circle of the lower grinding concave rod 7 and the outer circle of the lower positioning post 15.

[0024] The grinding drive unit 3 includes a dynamic torque driver 21 (using a motor) and an upper positioning post 22. The upper end of the dynamic torque driver 21 is fixedly mounted on the top of the housing frame 1. The upper end of the upper positioning post 22 is fixedly connected to the driving end of the dynamic torque driver 21. The center lines of the upper positioning post 22 and the lower positioning post 15 coincide. The upper end of the upper grinding protrusion 6 is coaxially connected to the lower end of the upper positioning post 22.

[0025] The upper clamping unit 4 includes a second upper clamping ring 23, a second lower clamping ring 24, and a second double-cone sleeve 25. The second double-cone sleeve 25 is a sleeve structure that is thicker in the middle, thinner at both ends, and open at both ends. The second double-cone sleeve 25 has an upper expansion joint 26 along the axial direction. The second double-cone sleeve 25 is coaxially fitted onto the lower part of the upper positioning post 22 and the upper part of the upper grinding protrusion 6. The second upper clamping ring 23 is coaxially fitted onto the upper part of the second double-cone sleeve 25, and the second lower clamping ring 24 is coaxially fitted onto the lower part of the second double-cone sleeve 25. Several... A second locking bolt 37 is vertically positioned and connected. The lower part of the second locking bolt 37 passes through the second lower clamping ring 24 from bottom to top, and the upper part of the second locking bolt 37 is threadedly connected to the second upper clamping ring 23. Under the fastening connection of the second locking bolt 37, the distance between the second upper clamping ring 23 and the second lower clamping ring 24 is shortened. The second upper clamping ring 23 and the second lower clamping ring 24 apply radial pressure to the second double cone sleeve 25, and the upper expansion joint 26 of the second double cone sleeve 25 is reduced. The upper and lower parts of the second double cone sleeve 25 respectively clamp the outer circle of the upper positioning post 22 and the outer circle of the upper grinding protrusion 6.

[0026] The gas collection unit 9 includes a top-and-bottom permeable sealing cylinder 27. The upper part of the inner wall of the sealing cylinder 27 is provided with an upper sealing ring 38 that seals with the outer circle of the upper grinding protrusion 6. The lower part of the inner wall of the sealing cylinder 27 is provided with a lower sealing ring that seals with the outer circle of the lower grinding concave rod 7. The upper and lower ends of the sealing cylinder 27 are respectively provided with an upper annular protective cover 28 and a lower annular protective cover 29. The middle part of the sealing cylinder 27 is connected to a gas collection pipe 30. A control valve 31 is provided on the gas collection pipe 30. The outlet end of the gas collection pipe 30 is connected to a gas collection bag 32.

[0027] Temperature control unit 10 includes temperature controller 33 and temperature control strip 34. Temperature controller 33 is connected to temperature control strip 34 via wire. Temperature control strip 34 is wrapped around the outer circumference of sealing cylinder 27 and is detachably connected via Velcro 39.

[0028] The middle clamping unit 8 includes a left clamp and a right clamp that are symmetrically arranged and have the same structure. The left clamp includes a second electric push rod 35. The left end of the second electric push rod 35 is fixedly connected to the left side wall of the box frame 1. The right end of the second electric push rod 35 is connected to a clamping block 36. The clamping block 36 is provided with an arc-shaped clamping opening, which is pressed against the temperature control belt 34.

[0029] The working process (gas production and collection method) of the grinding coal and rock gas generator includes the following steps:

[0030] S1. Secure the lower grinding concave rod 7 to the upper part of the support lifting unit through the lower clamping unit 5, and secure the upper grinding convex rod 6 to the lower part of the grinding drive unit 3 through the upper clamping unit 4.

[0031] S2. Place the coal or rock to be ground into the grinding groove 11 at the upper end of the lower grinding concave rod 7;

[0032] S3. Fit the lower part of the gas collection unit 9 onto the upper part of the lower grinding concave rod 7;

[0033] S4. Start the lifting support unit 2. The lifting support unit 2 drives the lower grinding concave rod 7, the gas collection unit 9 and the temperature control unit 10 to move upward synchronously. During the upward movement, the upper grinding rod extends into the gas collection unit 9 until the grinding head 12 at the lower end of the upper grinding convex rod 6 extends into the grinding groove 11 and reaches the set pressure with the coal and rock to be ground. Then the lifting support unit 2 stops rising.

[0034] S5. Fit the temperature control unit 10 onto the outside of the gas collection unit 9, and then activate the clamping unit 8 to clamp the temperature control unit 10 and the gas collection unit 9.

[0035] S6. Start the grinding drive unit 3. The grinding drive unit 3 drives the upper grinding protrusion 6 to rotate. The grinding head 12 at the lower end of the upper grinding protrusion 6 grinds the coal and rock in the grinding groove 11. The gas generated during the grinding process is collected by the gas collection unit 9. The temperature control unit 10 controls the temperature of the gas collection unit 9.

[0036] In step S1, the specific process of fastening the lower grinding concave rod 7 to the upper part of the support lifting unit via the lower clamping unit 5 is as follows: First, the lower end of the lower grinding concave rod 7 contacts the upper end of the lower positioning post 15. Then, the first double-cone sleeve 18, the first upper clamping ring 16, and the first lower clamping ring 17 are fitted downwards from the upper end of the lower grinding concave rod 7. When the lower half of the first double-cone sleeve 18 is fitted onto the outer circle of the lower positioning post 15, the downward movement stops. The first upper clamping ring 16 is then inserted downwards into the first locking bolt 20. The first locking bolt 20 is screwed into the interior of the first lower clamping ring 17. The first locking bolts are tightened one by one. Tighten bolt 20 to keep the first upper clamping ring 16 and the first lower clamping ring 17 horizontal. Under the action of the tightening connection of the first locking bolt 20, the distance between the first upper clamping ring 16 and the first lower clamping ring 17 is shortened. The first upper clamping ring 16 and the first lower clamping ring 17 apply radial pressure to the first double cone sleeve 18, and the lower expansion joint 19 of the first double cone sleeve 18 is reduced. The upper and lower parts of the first double cone sleeve 18 clamp the outer circle of the lower grinding concave rod 7 and the outer circle of the lower positioning post 15 respectively, thus fastening the lower grinding concave rod 7 and the lower positioning post 15 into one unit.

[0037] In step S1, the specific process of fastening the upper grinding protrusion 6 to the lower part of the grinding drive unit 3 via the upper clamping unit 4 is as follows: First, the upper end of the upper grinding protrusion 6 contacts the lower end of the upper positioning post 22. Then, the second double-cone sleeve 25, the second upper clamping ring 23, and the second lower clamping ring 24 are fitted upward from the lower end of the upper grinding protrusion 6. When the upper half of the second double-cone sleeve 25 is fitted onto the outer circle of the upper positioning post 22, the upward movement stops. The second lower clamping ring 24 is then inserted upward through the second locking bolt 37. The second locking bolt 37 is screwed into the interior of the second upper clamping ring 23. The second upper clamping ring 23 is tightened one by one. The locking bolt 37 keeps the second upper clamping ring 23 and the second lower clamping ring 24 horizontal. Under the tightening action of the second locking bolt 37, the distance between the second upper clamping ring 23 and the second lower clamping ring 24 is shortened. The second upper clamping ring 23 and the second lower clamping ring 24 apply radial pressure to the second double cone sleeve 25, and the upper expansion joint 26 of the second double cone sleeve 25 is reduced. The upper and lower parts of the second double cone sleeve 25 clamp the outer circle of the upper positioning post 22 and the outer circle of the upper grinding protrusion 6 respectively, thus fastening the upper grinding protrusion 6 and the upper positioning post 22 into one unit.

[0038] The specific process of step S3 is as follows: the sealing cylinder 27 is inserted into the upper part of the lower grinding concave rod 7 from top to bottom, and then the gas collecting pipe 30 and the gas collecting bag 32 are connected through a quick-connect fitting.

[0039] The specific process of step S4 is as follows: the first electric push rod 13 is started, the first electric push rod 13 extends, driving the moving disk 14 to move upward. The lower clamping unit 5, the gas collecting unit 9 and the temperature control unit 10 on the moving disk 14 move upward together. During the upward movement, the upper grinding protrusion 6 extends into the sealing cylinder 27. The outer circle of the upper grinding protrusion 6 is sealed and engaged with the upper sealing ring 38 until the pressure sensor detects that the grinding head 12 at the lower end of the upper grinding rod extends into the grinding groove 11 and reaches the set pressure with the coal and rock to be ground. Then the first electric push rod 13 stops extending.

[0040] Step S5 is as follows: wrap the temperature control tape 34 around the outside of the sealing cylinder 27 and secure it with Velcro 39; then activate the second electric push rods 35 on the left and right sides, and the two clamping blocks 36 on the left and right sides move relative to each other, and the arc-shaped clamping jaws of the clamping blocks 36 clamp the temperature control tape 34 and the sealing cylinder 27.

[0041] The specific process of step S6 is as follows: the dynamic torque driver 21 drives the upper positioning column 22 to rotate, the upper positioning column 22 drives the upper grinding protrusion 6 to rotate through the upper clamping unit 4, the grinding head 12 at the lower end of the upper grinding protrusion 6 grinds the coal and rock in the grinding groove 11, the gas generated during the grinding process is collected in the sealing cylinder 27 by the gas collecting pipe 30 into the gas collecting bag 32, and the temperature control unit 10 adjusts and controls the temperature of the internal environment of the sealing cylinder 27 during the grinding process.

[0042] The above embodiments are only used to illustrate and not limit the technical solutions of this utility model. Although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the utility model without departing from the spirit and scope of the utility model. Any modifications or partial substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A coal petrography gas generating device, characterized by: The box frame is internally provided with a lifting support unit, a grinding driving unit, an upper clamping unit, a lower clamping unit, an upper grinding convex rod, a lower grinding concave rod, a middle clamping unit, a gas collecting unit and a temperature control unit. The lower end of the lifting support unit is arranged at the bottom of the box frame, the upper end of the grinding driving unit is arranged at the top of the box frame, the lower part of the lower grinding concave rod is fastened to the upper part of the support lifting unit through the lower clamping unit, the upper part of the upper grinding convex rod is fastened to the lower part of the grinding driving unit through the upper clamping unit, the upper end surface of the lower grinding concave rod is provided with a grinding groove, the lower end of the upper grinding convex rod is provided with a grinding head extending into the grinding groove, the gas collecting unit is sleeved and sealed on the outer circle of the lower part of the upper grinding convex rod and the outer circle of the upper part of the lower grinding concave rod, the temperature control unit is arranged outside the gas collecting unit, and the middle clamping unit is arranged at the middle part of the side wall of the box frame and used for clamping the temperature control unit and the gas collecting unit.

2. The abrasive coal rock gas generating device according to claim 1, characterized in that: The lifting support unit comprises at least two first electric push rods fixedly arranged at the bottom of the box frame, a pressure sensor arranged on the first electric push rod, and a moving disc horizontally arranged at the upper end of the first electric push rod, wherein a lower positioning column is vertically arranged at the center of the moving disc, and the lower end of the lower grinding concave rod is coaxially butted to the upper end of the lower positioning column.

3. The abrasive coal-rock gas generating device according to claim 2, characterized in that: The lower clamping unit comprises a first upper clamping ring, a first lower clamping ring and a first double-cone clamp sleeve. The first double-cone clamp sleeve has a sleeve structure with a thick middle part and thin upper and lower ends, and is permeable from top to bottom. An axial lower expansion joint is arranged in the first double-cone clamp sleeve. The first double-cone clamp sleeve is coaxially sleeved on the upper part of the lower positioning column and the lower part of the lower grinding concave rod. The first upper clamping ring is coaxially sleeved on the upper part of the first double-cone clamp sleeve, and the first lower clamping ring is coaxially sleeved on the lower part of the first double-cone clamp sleeve. The first upper clamping ring and the first lower clamping ring are connected by a plurality of vertically arranged first locking bolts. The upper part of the first locking bolt passes through the first upper clamping ring from top to bottom, and the lower part of the first locking bolt is threadedly connected with the first lower clamping ring. Under the fastening connection of the first locking bolt, the distance between the first upper clamping ring and the first lower clamping ring is shortened, the first upper clamping ring and the first lower clamping ring exert radial pressure on the first double-cone clamp sleeve, and the lower expansion joint of the first double-cone clamp sleeve is reduced, and the upper part and the lower part of the first double-cone clamp sleeve clamp the outer circles of the lower grinding concave rod and the lower positioning column respectively.

4. The abrasive coal-rock gas generating device according to claim 3, characterized in that: The grinding driving unit comprises a dynamic torque driver and an upper positioning column. The upper end of the dynamic torque driver is fixedly arranged at the top of the box frame, and the upper end of the upper positioning column is fixedly connected with the driving end of the dynamic torque driver. The center lines of the upper positioning column and the lower positioning column coincide. The upper end of the upper grinding convex rod is coaxially butted to the lower end of the upper positioning column.

5. The abrasive coal rock gas generating device according to claim 4, characterized in that: The upper clamping unit comprises a second upper clamping ring, a second lower clamping ring and a second double-tapered sleeve; the second double-tapered sleeve is a sleeve structure with a thick middle, thin upper and lower ends and an upper and lower through hole, and an upper expansion joint is formed in the second double-tapered sleeve in the axial direction; the second double-tapered sleeve is coaxially sleeved on the lower part of the upper positioning column and the upper part of the upper grinding convex rod; the second upper clamping ring is coaxially sleeved on the upper part of the second double-tapered sleeve; the second lower clamping ring is coaxially sleeved on the lower part of the second double-tapered sleeve; the second upper clamping ring and the second lower clamping ring are connected by a plurality of second locking bolts arranged vertically; the lower part of the second locking bolt passes through the second lower clamping ring from bottom to top; the upper part of the second locking bolt is threadedly connected with the second upper clamping ring; under the fastening connection of the second locking bolt, the distance between the second upper clamping ring and the second lower clamping ring is shortened, the second upper clamping ring and the second lower clamping ring exert radial pressure on the second double-tapered sleeve, the lower expansion joint of the second double-tapered sleeve is reduced, and the upper part and the lower part of the second double-tapered sleeve clamp the outer circles of the upper positioning column and the upper grinding convex rod, respectively.

6. The abrasive coal rock gas generating device according to claim 5, characterized in that: The gas collecting unit comprises a sealing cylinder which is through in the upper and lower directions; an upper sealing ring which is in sealing cooperation with the outer circle of the upper grinding convex rod is arranged on the upper inner wall of the sealing cylinder; a lower sealing ring which is in sealing cooperation with the outer circle of the lower grinding concave rod is arranged on the lower inner wall of the sealing cylinder; an upper annular protective cover and a lower annular protective cover are arranged on the upper end and the lower end of the sealing cylinder, respectively; a gas collecting pipe is connected to the middle part of the sealing cylinder; a control valve is arranged on the gas collecting pipe; and a gas collecting bag is connected to the outlet end of the gas collecting pipe.

7. The abrasive coal rock gas generating device according to claim 6, characterized in that: The temperature control unit comprises a temperature control instrument and a temperature control belt; the temperature control instrument is connected to the temperature control belt through wires; and the temperature control belt is wrapped around the outer circle of the sealing cylinder and is detachably connected through a magic tape.

8. The abrasive coal rock gas generating device according to claim 7, characterized in that: The middle clamping unit comprises a left clamping device and a right clamping device which are symmetrically arranged and have the same structure; the left clamping device comprises a second electric push rod; the left end of the second electric push rod is fixedly connected to the left side wall of the box frame; a clamping block is connected to the right end of the second electric push rod; the clamping block is provided with an arc-shaped clamping opening; and the arc-shaped clamping opening is in pressure connection with the temperature control belt.

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