Coal mine gas zero overrun control early warning device and method

Abstract

The invention discloses a coal mine gas zero overrun control early warning device and method, and relates to the technical field of gas overrun early warning, the coal mine gas zero overrun control early warning device comprises a supporting frame, a bolt is installed on the surface of the supporting frame in a threaded mode, and an electric push rod is fixedly installed at the bottom of the supporting frame; the protection device is arranged at the bottom of the electric push rod, the protection device comprises a threaded ring, a fixing rod, a filtering frame, a gas sensor, an alarm, a supporting seat, a semicircular plate, a connecting frame, a rotating rod and a connecting rope, dust and coal ash in hollow air are filtered through the filtering frame, and the coal ash is prevented from being attached to the gas sensor; a spiral groove is formed in the output end of the electric push rod, the threaded ring is rotationally installed at the fixed end of the electric push rod and is in threaded connection with the spiral groove, and the fixed rod is fixedly installed at the bottom of the threaded ring to prevent coal ash from entering equipment through the bottom of the filter frame to affect the sensitivity and stability of the gas sensor.

Description

Technical Field

[0001] The invention relates to the technical field of gas over-limit early warning, and in particular to a coal mine gas zero over-limit control early warning device and method. Background Art

[0002] In the coal mining industry, gas exceeding the limit is one of the main causes of gas accidents. Therefore, gas detection and over-limit warning in coal mines are extremely important.

[0003] The patent with the patent announcement number CN220319626U relates to a coal mine gas zero over-limit control early warning device. Its technical solution includes a fixed frame, an air duct and a gas sensor. A gas sensor is fixedly installed in the middle position of the air duct, a filter is fixedly installed at both ends of the air duct, fans are symmetrically fixedly installed at both sides of the air duct, and a PLC controller, an alarm and an early warning device are fixedly installed on the lower surface of the air duct. This patent can prevent dust such as coal ash from adhering and accumulating on the surface of the gas sensor, stabilize the detection accuracy of the gas sensor, issue early warnings and control in time, and at the same time extend the service life of the gas sensor.

[0004] In the above patent, it is possible to prevent coal ash and other dust from adhering and accumulating on the surface of the gas sensor, stabilize the detection accuracy of the gas sensor, issue early warning and control in time, and at the same time extend the service life of the gas sensor. However, during use, dust adhering directly to the gas sensor may cause the gas sensor to malfunction, causing the gas sensor to lose its detection effect, posing a safety hazard. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a coal mine gas zero over-limit control early warning device and method, which solves the problems raised in the above-mentioned background technology.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a coal mine gas zero over-limit control and early warning device, comprising: a support frame, a bolt is threadedly installed on the surface of the support frame, and an electric push rod is fixedly installed on the bottom of the support frame; a protective device, the protective device is arranged at the bottom of the electric push rod, the protective device comprises a threaded ring, a fixed rod, a filter frame, a gas sensor, an alarm, a support seat, a semicircular plate, a connecting frame, a rotating rod and a connecting rope, the dust and coal ash in the hollow air are filtered through the filter frame to prevent the coal ash from adhering to the gas sensor, a spiral groove is opened at the output end of the electric push rod, the threaded ring is rotatably installed at the fixed end of the electric push rod, and the threaded ring and the spiral groove Threaded connection, the fixing rod is fixedly installed at the bottom of the threaded ring, the filter frame is rotatably installed at the output end of the electric push rod, the fixing rod passes through the top of the filter frame, the gas sensor is fixedly installed on the top of the inner wall of the filter frame, the alarm is rotatably installed at the bottom of the support frame, the support seat is fixedly installed at the bottom of the filter frame, the semicircular plate is rotatably installed on the inner wall of the support seat, the connecting frame is fixedly installed on the inner wall of the filter frame, the rotating rod is rotatably installed on the inner wall of the connecting frame, one end of the connecting rope is fixedly installed at the bottom of the fixing rod, and the other end of the connecting rope is fixedly installed on the surface of the semicircular plate. The electric push rod resets the connecting rope to pull the semicircular plate to rotate upward, and the semicircular plate is used to seal the bottom of the filter frame.

[0007] According to the above technical solution, the connecting rope contacts the surface of the rotating rod, a No. 1 torsion spring is arranged between the semicircular plate and the support seat, the semicircular plate is reset by the No. 1 torsion spring, and the gas sensor and the alarm are electrically connected.

[0008] According to the above technical solution, it also includes an anti-adhesion device and an anti-clogging device. The anti-adhesion device includes an elastic telescopic rod, a connecting plate and a scraper. The coal ash adhering to the filter frame is scraped off by the scraper. The elastic telescopic rod is fixedly installed at the bottom of the support frame, the connecting plate is fixedly installed at the free end of the elastic telescopic rod, and the scraper is fixedly installed at the bottom of the connecting plate.

[0009] According to the above technical solution, a guide frame is fixedly installed on the surface of the connecting plate, a rotating plate is rotatably installed on the inner wall of the guide frame, an elastic telescopic connecting rod is fixedly installed on the bottom of the support frame, a connecting rod is fixedly installed on the free end of the elastic telescopic connecting rod, the connecting rod slides on the inner wall of the guide frame, a slider is fixedly installed on the free end of the elastic telescopic connecting rod, a slide rail is fixedly installed on the top of the filter frame, and the slider is slidably installed on the inner wall of the slide rail. When the electric push rod drives the filter frame to move downward, the scraper will not contact the filter frame.

[0010] According to the above technical solution, a No. 2 torsion spring is arranged between the rotating plate and the guide frame, and the No. 2 torsion spring drives the rotating plate to reset, and the scraper contacts the surface of the filter frame.

[0011] According to the above technical scheme, the anti-blocking device includes a threaded block, a long rod, a pulley and a belt. The rotation of the threaded block will drive the long rod to rotate, the rotation of the long rod will drive the pulley to rotate, the rotation of the pulley will drive the alarm to rotate through the belt, and the rotation of the alarm can throw off the adhered coal ash through centrifugal force. The free end of the elastic telescopic connecting rod is provided with a spiral groove, the threaded block is rotatably installed on the fixed end of the elastic telescopic connecting rod, the threaded block is threadedly connected to the spiral groove, the long rod is fixedly installed on the top of the threaded block, the pulley is fixedly installed on the top of the long rod, and the pulley is rotatably installed on the bottom of the support frame. The pulley and the alarm are connected by a belt drive.

[0012] According to the above technical solution, a semicircular block is fixedly installed on the top of the alarm, a square plate is fixedly installed on the bottom of the support frame, a rotating rod is rotatably installed on the bottom of the square plate, and a protrusion is fixedly installed on the surface of the rotating rod. The rotation of the alarm will drive the semicircular block to rotate, and the semicircular block will contact the protrusion during the rotation process.

[0013] According to the above technical solution, a No. 3 torsion spring is arranged between the square plate and the rotating rod, and the No. 3 torsion spring drives the rotating rod to reset. The semicircular block and the rotating rod are arranged on the same horizontal plane.

[0014] A method for using a coal mine gas zero over-limit control early warning device comprises the following steps:

[0015] Step 1: Filter the dust and soot in the hollow air through the filter frame, so as to remove the solid waste in the air and prevent the solid waste from adhering to the gas sensor. When the gas sensor detects that the gas exceeds the limit, the alarm is activated to alarm and evacuate personnel in time to ensure their safety;

[0016] Step 2: Start the electric push rod, which drives the filter frame and gas sensor to move downward, making it easier for the staff to perform maintenance quickly;

[0017] Step 3: The electric push rod moves downward to drive the threaded ring to rotate, and the rotation of the threaded ring drives the fixed rod and the filter frame to rotate. The rotation of the filter frame can throw off part of the adhered dust through centrifugal force, preventing a large amount of coal dust from adhering to the hands during maintenance, which affects the maintenance efficiency;

[0018] Step 4: Start the electric push rod to reset. The electric push rod reset connecting rope pulls the semicircular plate to rotate upward, and the semicircular plate is used to seal the bottom of the filter frame to prevent coal ash from entering the equipment through the bottom of the filter frame and affecting the sensitivity and stability of the gas sensor.

[0019] The present invention provides a coal mine gas zero over-limit control early warning device and method. It has the following beneficial effects:

[0020] (1) The invention filters dust and coal ash in the air through a filter frame to prevent the coal ash from adhering to the gas sensor. When the gas sensor detects that the gas exceeds the limit, the alarm is activated to sound an alarm, and personnel are evacuated in time to ensure their safety. At the same time, the electric push rod is activated, which will drive the filter frame and the gas sensor to move downward, making it convenient for staff to quickly perform maintenance. At the same time, the rotation of the threaded ring will drive the fixed rod and the filter frame to rotate. The rotation of the filter frame can shake off some of the adhered dust through centrifugal force, preventing a large amount of coal ash from adhering to the hands during maintenance, which affects the maintenance efficiency. The bottom of the filter frame is sealed with a semicircular plate to prevent coal ash from entering the equipment through the bottom of the filter frame and affecting the sensitivity and stability of the gas sensor.

[0021] (2) In the present invention, when the electric push rod is reset, the filter frame will be driven to move upward, and the filter frame will come into contact with a scraper. The scraper will scrape off the coal ash adhering to the filter frame to prevent excessive dust from adhering to the filter frame and clogging the filter frame, causing the gas sensor to be unable to detect the gas concentration in time, thereby posing a safety hazard. When the electric push rod drives the filter frame to move downward, the scraper will not come into contact with the filter frame, preventing the scraper from continuously scraping the filter frame, which may reduce the service life of the scraper or the filter frame.

[0022] (3) In the present invention, the rotation of the threaded block drives the long rod to rotate, the rotation of the long rod drives the pulley to rotate, the rotation of the pulley drives the alarm to rotate through the belt, and the rotation of the alarm can shake off the adhered coal ash through centrifugal force to prevent the coal ash from clogging the loudspeaker port of the alarm, resulting in a very low alarm sound, which makes it difficult for staff to hear the alarm in time and affects the best escape opportunity. At the same time, the rotation of the alarm drives the semicircular block to rotate, and the semicircular block will contact the protrusion during the rotation process. The contact between the semicircular block and the protrusion generates vibration, which can shake off the blocked dust and increase the alarm sound, helping to remind staff to evacuate in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the cross-sectional structure of the filter frame of the present invention;

[0025] Figure 3 This is a schematic diagram of the structure of the anti-adhesion device of the present invention;

[0026] Figure 4 For the present invention Figure 3 A schematic diagram of the structure enlargement of part A;

[0027] Figure 5 This is a schematic diagram of the structure of the anti-blocking device of the present invention;

[0028] Figure 6This is a schematic diagram of the structure of the alarm and belt of the present invention;

[0029] Figure 7 It is a schematic diagram of the cross-sectional structure of the support frame of the present invention;

[0030] Figure 8 For the present invention Figure 7 Schematic diagram of the enlarged structure of part B.

[0031] In the figure: 1, support frame; 2, bolt; 3, electric push rod; 4, threaded ring; 5, fixing rod; 6, filter frame; 7, gas sensor; 8, alarm; 9, support seat; 10, semicircular plate; 11, connecting frame; 12, rotating rod; 13, connecting rope; 141, elastic telescopic rod; 142, connecting plate; 143, scraper; 144, guide frame; 145, rotating plate; 146, elastic telescopic connecting rod; 147, connecting rod; 148, slider; 149, slide rail; 151, threaded block; 152, long rod; 153, pulley; 154, belt; 155, semicircular block; 156, square plate; 157, rotating rod; 158, bump. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] See also Figure 1-Figure 8, one embodiment of the present invention is: a coal mine gas zero over-limit control and early warning device, comprising: a support frame 1, a bolt 2 is threadedly installed on the surface of the support frame 1, and an electric push rod 3 is fixedly installed at the bottom of the support frame 1; a protection device, the protection device is arranged at the bottom of the electric push rod 3, the protection device comprises a threaded ring 4, a fixed rod 5, a filter frame 6, a gas sensor 7, an alarm 8, a support seat 9, a semicircular plate 10, a connecting frame 11, a rotating rod 12 and a connecting rope 13. When the gas sensor 7 detects that the gas exceeds the limit, the alarm 8 is activated to alarm, and personnel are evacuated in time to ensure personnel safety. A spiral groove is opened at the output end of the electric push rod 3, the threaded ring 4 is rotatably installed at the fixed end of the electric push rod 3, the threaded ring 4 is threadedly connected to the spiral groove, the fixed rod 5 is fixedly installed at the bottom of the threaded ring 4, and the filter frame 6 is rotatably mounted on the output end of the electric push rod 3, the fixed rod 5 passes through the top of the filter frame 6, the gas sensor 7 is fixedly mounted on the top of the inner wall of the filter frame 6, and a gas parameter rapid determination instrument is arranged inside the gas sensor 7, which can quickly detect the gas concentration, the alarm 8 is rotatably mounted on the bottom of the support frame 1, the support seat 9 is fixedly mounted on the bottom of the filter frame 6, the semicircular plate 10 is rotatably mounted on the inner wall of the support seat 9, the connecting frame 11 is fixedly mounted on the inner wall of the filter frame 6, the rotating rod 12 is rotatably mounted on the inner wall of the connecting frame 11, one end of the connecting rope 13 is fixedly mounted on the bottom of the fixed rod 5, and the other end of the connecting rope 13 is fixedly mounted on the surface of the semicircular plate 10 to prevent coal ash from entering the interior of the equipment through the bottom of the filter frame 6 and affecting the sensitivity and stability of the gas sensor 7.

[0034] The connecting rope 13 is in contact with the surface of the rotating rod 12. A torsion spring No. 1 is arranged between the semicircular plate 10 and the supporting seat 9. The semicircular plate 10 is reset by the torsion spring No. 1. The gas sensor 7 and the alarm 8 are electrically connected.

[0035] When the present embodiment is working, the dust and coal ash in the air are filtered through the filter frame 6 to prevent the coal ash from adhering to the gas sensor 7. When the gas sensor 7 detects that the gas exceeds the limit, the alarm 8 is activated to give an alarm, and personnel are evacuated in time to ensure personnel safety. At the same time, when the gas sensor 7 fails and needs to be repaired, the electric push rod 3 is started, and the electric push rod 3 will drive the filter frame 6 and the gas sensor 7 to move downward, which is convenient for the staff to quickly perform maintenance. At the same time, when the electric push rod 3 moves downward, it will drive the threaded ring 4 to rotate, and the rotation of the threaded ring 4 will drive the fixing rod 5 and the filter frame 6 to rotate, and the adhered Part of the dust is thrown off by centrifugal force to prevent a large amount of coal ash from adhering to the hands during maintenance, which affects the maintenance efficiency. At the same time, the downward movement of the filter frame 6 will drive the support seat 9 and the semicircular plate 10 to move downward, and the connecting rope 13 will lose the pulling force on the semicircular plate 10, and the semicircular plate 10 will be driven to rotate downward by the No. 1 torsion spring, which is convenient for maintenance personnel to carry out maintenance. When the maintenance is completed, the electric push rod 3 is started to reset. The connecting rope 13 of the electric push rod 3 resets and pulls the semicircular plate 10 to rotate upward. The semicircular plate 10 is used to seal the bottom of the filter frame 6 to prevent coal ash from entering the equipment through the bottom of the filter frame 6 and affecting the sensitivity and stability of the gas sensor 7.

[0036] See also Figure 1-Figure 8 On the basis of the above embodiment, another embodiment of the present invention further includes an anti-adhesion device and an anti-clogging device. The anti-adhesion device includes an elastic telescopic rod 141, a connecting plate 142 and a scraper 143. The elastic telescopic rod 141 is fixedly installed at the bottom of the support frame 1, the connecting plate 142 is fixedly installed at the free end of the elastic telescopic rod 141, and the scraper 143 is fixedly installed at the bottom of the connecting plate 142 to prevent excessive dust adhesion from clogging the filter frame 6, causing the gas sensor 7 to be unable to detect the gas concentration in time, posing a safety hazard.

[0037] A guide frame 144 is fixedly installed on the surface of the connecting plate 142, and a rotating plate 145 is rotatably installed on the inner wall of the guide frame 144. An elastic telescopic connecting rod 146 is fixedly installed on the bottom of the support frame 1, and a connecting rod 147 is fixedly installed on the free end of the elastic telescopic connecting rod 146. The connecting rod 147 slides on the inner wall of the guide frame 144, and a slider 148 is fixedly installed on the free end of the elastic telescopic connecting rod 146. A slide rail 149 is fixedly installed on the top of the filter frame 6, and the slider 148 is slidably installed on the inner wall of the slide rail 149 to prevent the scraper 143 from continuously scraping the filter frame 6, which may reduce the service life of the scraper 143 or the filter frame 6.

[0038] A second torsion spring is provided between the rotating plate 145 and the guide frame 144 , and the rotating plate 145 is driven to return to its original position by the second torsion spring, so that the scraper 143 contacts the surface of the filter frame 6 .

[0039] The anti-blocking device includes a threaded block 151, a long rod 152, a pulley 153 and a belt 154. A spiral groove is provided at the free end of the elastic telescopic connecting rod 146. The threaded block 151 is rotatably installed on the fixed end of the elastic telescopic connecting rod 146. The threaded block 151 is threadedly connected to the spiral groove. The long rod 152 is fixedly installed on the top of the threaded block 151. The pulley 153 is fixedly installed on the top of the long rod 152. The pulley 153 is rotatably installed at the bottom of the support frame 1. The pulley 153 and the alarm 8 are connected by a belt 154 to prevent coal ash from blocking the sound expansion port of the alarm 8, resulting in a very low sound when the alarm is triggered, causing the staff to be unable to hear it in time, affecting the best escape opportunity.

[0040] A semicircular block 155 is fixedly installed on the top of the alarm 8, a square plate 156 is fixedly installed on the bottom of the support frame 1, a rotating rod 157 is rotatably installed on the bottom of the square plate 156, and a protrusion 158 is fixedly installed on the surface of the rotating rod 157. Vibration is generated by the contact between the semicircular block 155 and the protrusion 158, and the blocked dust is shaken off by the vibration, thereby improving the anti-blocking effect.

[0041] A No. 3 torsion spring is arranged between the square plate 156 and the rotating rod 157, and the No. 3 torsion spring drives the rotating rod 157 to return to its original position. The semicircular block 155 and the rotating rod 157 are arranged on the same horizontal plane.

[0042] When the present embodiment is working, when the electric push rod 3 is reset, it will drive the filter frame 6 to move upward, and the filter frame 6 will contact the scraper 143. The scraper 143 will scrape off the coal ash adhering to the filter frame 6 to prevent excessive dust from adhering to the filter frame 6 and clogging the filter frame 6, causing the gas sensor 7 to fail to detect the gas concentration in time, which poses a safety hazard. At the same time, the continuous upward movement of the filter frame 6 will drive the slider 148, the connecting rod 147 and the elastic telescopic connecting rod 146 to move upward. The upward movement of the connecting rod 147 will contact the inclined surface of the guide frame 144, and the squeezing of the connecting rod 147 will push the guide frame 144 to move away from the filter frame 6. The movement of frame 144 away from guide frame 144 will drive scraper 143 to move away from filter frame 6. The connecting rod 147 will contact rotating plate 145 during its movement along the inclined plane. The connecting rod 147 will push rotating plate 145 to rotate upward. When the connecting rod 147 is disengaged from rotating plate 145, the No. 2 torsion spring will drive the rotating plate 145 to reset. The reset of rotating plate 145 will block the connecting rod 147 from resetting along the inclined plane. When the electric push rod 3 drives the filter frame 6 to move downward, the scraper 143 will not contact the filter frame 6, preventing the scraper 143 from continuously scraping the filter frame 6, which may reduce the service life of the scraper 143 or the filter frame 6.

[0043] When the free end of the elastic telescopic link 146 contracts, it will squeeze the threaded block 151 to rotate, and the rotation of the threaded block 151 will drive the long rod 152 to rotate, and the rotation of the long rod 152 will drive the pulley 153 to rotate, and the rotation of the pulley 153 will drive the alarm 8 to rotate through the belt 154. The rotation of the alarm 8 can throw off the adhered coal ash through centrifugal force to prevent the coal ash from blocking the sound expansion port of the alarm 8, resulting in a very small sound when the alarm is sounded, causing the staff to be unable to hear it in time, affecting the best escape opportunity. At the same time, when the alarm 8 rotates, it will drive the semicircular Block 155 rotates, and the semicircular block 155 will contact the protrusion 158 during the rotation process. The contact between the semicircular block 155 and the protrusion 158 generates vibration, and the blocked dust is shaken off by the vibration, thereby improving the warning effect. At the same time, when the alarm 8 is reversed, the semicircular block 155 will push the rotating rod 157 to rotate in the direction away from the semicircular block 155. The rotating rod 157 rotates in the direction away from the semicircular block 155 and contacts the protrusion 158. The contact between the semicircular block 155 and the protrusion 158 generates vibration, thereby increasing the vibration frequency and improving the anti-blocking effect.

[0044] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A coal mine gas zero over-limit control early warning device, characterized in that: include: A support frame (1), wherein a bolt (2) is threadedly mounted on the surface of the support frame (1), and an electric push rod (3) is fixedly mounted on the bottom of the support frame (1); A protective device, the protective device is arranged at the bottom of the electric push rod (3), the protective device comprises a threaded ring (4), a fixed rod (5), a filter frame (6), a gas sensor (7), an alarm (8), a support seat (9), a semicircular plate (10), a connecting frame (11), a rotating rod (12) and a connecting rope (13), the output end of the electric push rod (3) is provided with a spiral groove, the threaded ring (4) is rotatably mounted on the fixed end of the electric push rod (3), the threaded ring (4) is threadedly connected to the spiral groove, the fixed rod (5) is fixedly mounted at the bottom of the threaded ring (4), and the filter frame (6) is rotatably mounted on the output end of the electric push rod (3) The fixing rod (5) passes through the top of the filter frame (6), the gas sensor (7) is fixedly mounted on the top of the inner wall of the filter frame (6), the alarm (8) is rotatably mounted on the bottom of the support frame (1), the support seat (9) is fixedly mounted on the bottom of the filter frame (6), the semicircular plate (10) is rotatably mounted on the inner wall of the support seat (9), the connecting frame (11) is fixedly mounted on the inner wall of the filter frame (6), the rotating rod (12) is rotatably mounted on the inner wall of the connecting frame (11), one end of the connecting rope (13) is fixedly mounted on the bottom of the fixing rod (5), and the other end of the connecting rope (13) is fixedly mounted on the surface of the semicircular plate (10); Wherein, an anti-adhesion device for scraping the filter frame (6) is arranged on the top of the filter frame (6), and an anti-clogging device is arranged on the anti-adhesion device.

2. A coal mine gas zero over-limit control and early warning device according to claim 1, characterized in that: The connecting rope (13) is in surface contact with the rotating rod (12), a first torsion spring is arranged between the semicircular plate (10) and the supporting seat (9), and the gas sensor (7) and the alarm (8) are electrically connected.

3. A coal mine gas zero over-limit control and early warning device according to claim 2, characterized in that: The anti-adhesion device comprises an elastic telescopic rod (141), a connecting plate (142) and a scraper (143); the elastic telescopic rod (141) is fixedly mounted on the bottom of the support frame (1); the connecting plate (142) is fixedly mounted on the free end of the elastic telescopic rod (141); and the scraper (143) is fixedly mounted on the bottom of the connecting plate (142).

4. A coal mine gas zero over-limit control and early warning device according to claim 3, characterized in that: A guide frame (144) is fixedly mounted on the surface of the connecting plate (142); a rotating plate (145) is rotatably mounted on the inner wall of the guide frame (144); an elastic telescopic connecting rod (146) is fixedly mounted on the bottom of the supporting frame (1); a connecting rod (147) is fixedly mounted on the free end of the elastic telescopic connecting rod (146); the connecting rod (147) slides on the inner wall of the guide frame (144); a sliding block (148) is fixedly mounted on the free end of the elastic telescopic connecting rod (146); a sliding rail (149) is fixedly mounted on the top of the filter frame (6); and the sliding block (148) is slidably mounted on the inner wall of the sliding rail (149).

5. A coal mine gas zero over-limit control and early warning device according to claim 4, characterized in that: A No. 2 torsion spring is provided between the rotating plate (145) and the guide frame (144), and the scraper (143) is in contact with the surface of the filter frame (6).

6. A coal mine gas zero over-limit control and early warning device according to claim 5, characterized in that: The anti-blocking device comprises a threaded block (151), a long rod (152), a pulley (153) and a belt (154); a spiral groove is provided at the free end of the elastic telescopic connecting rod (146); the threaded block (151) is rotatably mounted on the fixed end of the elastic telescopic connecting rod (146); the threaded block (151) is threadedly connected to the spiral groove; the long rod (152) is fixedly mounted on the top of the threaded block (151); the pulley (153) is fixedly mounted on the top of the long rod (152); the pulley (153) is rotatably mounted on the bottom of the support frame (1); and the pulley (153) and the alarm (8) are connected by a belt (154).

7. A coal mine gas zero over-limit control and early warning device according to claim 6, characterized in that: A semicircular block (155) is fixedly mounted on the top of the alarm (8), a square plate (156) is fixedly mounted on the bottom of the support frame (1), a rotating rod (157) is rotatably mounted on the bottom of the square plate (156), and a protrusion (158) is fixedly mounted on the surface of the rotating rod (157).

8. A coal mine gas zero over-limit control and early warning device according to claim 7, characterized in that: A No. 3 torsion spring is arranged between the square plate (156) and the rotating rod (157), and the semicircular block (155) and the rotating rod (157) are arranged on the same horizontal plane.

9. The method for using the coal mine gas zero over-limit control and early warning device according to claim 8, characterized in that: The following steps are involved: Step 1: Filter the dust and coal ash in the hollow air through the filter frame (6), so as to remove the solid waste in the air and prevent the solid waste from adhering to the gas sensor (7). When the gas sensor (7) detects that the gas exceeds the limit, the alarm (8) is activated to alarm, and personnel are evacuated in time to ensure personnel safety; Step 2: Start the electric push rod (3), which drives the filter frame (6) and the gas sensor (7) to move downward, so that the staff can quickly carry out maintenance; Step 3: The electric push rod (3) moves downward to drive the threaded ring (4) to rotate, and the rotation of the threaded ring (4) drives the fixed rod (5) and the filter frame (6) to rotate. The filter frame (6) rotates to throw off part of the adhered dust through centrifugal force, thereby preventing a large amount of coal dust from adhering to the hands during maintenance, which affects the maintenance efficiency; Step 4: Start the electric push rod (3) to reset. The reset connecting rope (13) of the electric push rod (3) pulls the semicircular plate (10) to rotate upward, and the semicircular plate (10) is used to seal the bottom of the filter frame (6) to prevent coal ash from entering the equipment through the bottom of the filter frame (6) and affecting the sensitivity and stability of the gas sensor (7).

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