SF6 gas wireless remote transmission density meter based on Internet of Things

Abstract

The invention belongs to the technical field of gas density meters, and particularly relates to an SF6 gas wireless remote transmission density meter based on the Internet of Things, which comprises a dial plate, a density cavity, a connecting pipe, a gas pipe and a density wireless transmission system, a rotating shaft is fixed to the front side of the first gear, the outer side of the rotating shaft is sleeved with a sleeve, the sleeve is fixedly installed on the inner wall of the dial plate, a volute spiral spring is arranged in the sleeve, and the rotating shaft and the sleeve are connected through the volute spiral spring; the density cavity is connected to the lower portion of the dial plate through the connecting pipe and communicated with the dial plate, the gas pipe is connected to the lower portion of the density cavity and connected with an external SF6 circuit breaker pipeline, a pressure plate is arranged on the inner wall of the density cavity, and the outer side of the pressure plate is sleeved with a sealing ring. And the monitoring precision is poor.

Description

Technical Field

[0001] The invention belongs to the technical field of gas density meters, and in particular relates to an SF6 gas wireless remote transmission density meter based on the Internet of Things. Background Art

[0002] The so-called density refers to the mass per unit volume of a specific substance under specific conditions. The SF6 gas in the SF6 circuit breaker is sealed in a fixed container. It has a certain density value at the rated pressure of 20°C. Within the range of various allowable conditions for the operation of the circuit breaker, although the pressure of SF6 gas changes with temperature, the density value of SF6 gas is always the same. Since the insulation and arc extinguishing performance of the SF6 circuit breaker depends to a large extent on the purity and density of SF6 gas, the detection of SF6 gas purity and density monitoring are particularly important. If an ordinary pressure gauge is used to monitor the leakage of SF6 gas, it is difficult to distinguish whether the pressure change of SF6 gas is caused by actual leakage or changes in ambient temperature. In order to achieve the purpose of frequent density monitoring, the SF6 circuit breaker should be equipped with an SF6 gas density meter or density relay. The SF6 gas density meter is used for monitoring, and the density relay is used for control and protection.

[0003] The SF6 gas density meters currently on the market have poor monitoring accuracy and are prone to leakage, which results in inaccurate monitoring data. This phenomenon has become a problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0004] The purpose of the present invention is to provide an SF6 gas wireless remote transmission density meter based on the Internet of Things to solve the problems raised in the above background technology.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: an SF6 gas wireless remote transmission density meter based on the Internet of Things, comprising a dial, a density cavity, a connecting pipe, an air pipe and a density wireless transmission system, wherein a pointer dial is installed on the middle bearing of the dial, a gear 1 is fixed on the front side of the pointer dial, a rotating shaft is fixed on the front side of the gear 1, a sleeve is sleeved on the outer side of the rotating shaft, the sleeve is fixedly installed on the inner wall of the dial, a volute spring is arranged inside the sleeve, and the rotating shaft and the sleeve are connected through the volute spring; the density cavity is connected to the bottom of the dial through a connecting pipe, and the volute spring is connected to the bottom of the density cavity and is connected to an external SF6 circuit breaker pipeline; a pressure plate is arranged on the inner wall of the density cavity, a sealing ring is sleeved on the outer side of the pressure plate, and the sealing ring is slidably connected to the inner wall of the density cavity; a fixing rod is connected above the pressure plate, and a connecting rod is connected to the upper end bearing of the fixing rod, the connecting rod is inserted into the interior of the connecting pipe, and a tooth plate is fixed on the upper end, and the gear 1 and the tooth plate are meshed with each other.

[0006] The present invention further illustrates that through holes are provided on the left and right sides of the pressure plate, and sliding rods are slidably connected in the through holes, the bottom end of the sliding rod is fixed to the bottom of the inner wall of the density chamber, and a gas detection disk is slidably connected to the outer side of the upper end, and the gas detection disk is located above the pressure plate; a motor is fixed above the inner wall of the density chamber, the output end of the motor is fixedly connected to an output rod, a circular disc is connected to the outer side of the output rod, a toothed disc is connected below the circular disc, a gear 2 is fixed to the outer side of the fixed rod, and the gear 2 and the toothed disc are meshed with each other, a countersunk hole is provided on the surface of the pressure plate, the fixed rod is inserted into the countersunk hole, and a fixed block is fixed at the lower end, a plurality of spheres 1 are evenly fixed on the outer side of the fixed block, a plurality of sliding holes are provided inside the pressure plate, and extrusion rods are slidably connected in the sliding holes, the outer end of the extrusion rod is fixed to a sealing ring, the inner end is spherical, and after the fixed block rotates, the sphere 1 contacts the spherical part of the extrusion rod.

[0007] The present invention further describes that a gas detection module and a control module are provided inside the gas detection disk, the gas detection module is used to detect whether there is SF6 gas above the pressure plate, and the control module is used to drive the motor to operate when SF6 gas exists above the pressure plate.

[0008] The present invention further illustrates that a plum blossom groove is provided on the top of the toothed disc, a plum blossom block is fixed on the bottom of the circular disc, and the plum blossom block is embedded in the plum blossom groove, a threaded rod is fixed on the bottom of the toothed disc, a threaded hole is provided on the surface of the pressure plate, and is threadedly connected to the threaded rod; protrusions are fixed on the left and right sides of the output rod, a groove is provided in the middle of the circular disc, and is slidably connected to the protrusion of the output rod through the groove, an electromagnetic plate is fixed on the top of the output rod, the electromagnetic plate is magnetic when energized, the circular disc is made of metal, and the electromagnetic plate is electrically connected to the inside of the motor.

[0009] The present invention further illustrates that blocking blocks are fixed on both sides above the gas detection disk, holes are provided on both sides above the density chamber, and the blocking blocks are slidably connected in the holes, and a plurality of spheres 2 are provided above the disc and below the gas detection disc, and after the disc moves upward, the spheres 2 below the gas detection disc and the spheres 2 above the disc contact each other; a limit block is fixed on the outer side of the sliding rod, and an elastic spring is fixed between the top of the limit block and the bottom of the gas detection disc.

[0010] The present invention further describes that the outer surface of the sliding rod is in contact with the inner walls of the through holes on the left and right sides of the pressure plate.

[0011] The present invention further illustrates that the density wireless transmission system includes a density measuring module and a wireless transmission module. The density measuring module is electrically connected to the wireless transmission module. The density measuring module is used to measure the density of SF6 gas according to the pressure of SF6 gas, and the density value corresponds to the scale value corresponding to the rotation of the pointer of the dial. The wireless transmission module is used to transmit the density value of SF6 gas to the terminal via wireless signals.

[0012] Compared with the prior art, the beneficial effects achieved by the present invention are: the present invention monitors the density value of SF6 through the conversion of pressure and density, and transmits the density data through the density wireless transmission system to realize wireless monitoring. When the gas density decreases, the volute spring generates a reaction force to push the rotating shaft to rotate in the opposite direction, and the density value decreases. The monitoring accuracy is high and more sensitive, the overall structure is simple, and the manufacturing cost is low. By controlling the rotation force of the motor, the force in the middle of the sealing ring is controlled, so that the sealing ring maintains the sealing effect, avoiding gas leakage and inaccurate SF6 gas density monitoring. At the same time, when the sealing ring moves up and down, friction between the sealing ring and the inner wall of the density chamber causes wear. By squeezing the middle part of the sealing ring, wear compensation can be performed to ensure high-strength sealing. At the same time, by controlling the rotation force of the motor, the large squeezing force between the sealing ring and the inner wall of the density chamber is avoided, which causes movement obstruction and affects density monitoring. By squeezing only the middle part of the sealing ring, the upper and lower parts of the sealing ring can be expanded and deformed to the upper and lower sides, and the fit between the inner wall of the density chamber and the pressure plate is higher; After the sealing compensation of the sealing ring is completed, the gas detection disk drives the block to jump up and down continuously. When the block jumps upward, the hole opens, and the gas above the pressure plate can flow through the hole. In this way, after the gas leaks, the gas above the pressure plate can be replaced to avoid affecting the subsequent detection of SF6 gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the internal structure of the SF6 gas wireless remote density meter of the present invention; Figure 3 is a plan view of the present invention; Figure 4 It is a schematic diagram of the internal structure of the dial of the present invention; Figure 5 is a plan view of the dial of the present invention; Figure 6It is a schematic diagram of the internal structure of the pressure plate of the present invention; Figure 7 is a cross-sectional view of a toothed disc and a disc of the present invention; Figure 8 It is a schematic diagram of the shape of the plum blossom block and the plum blossom groove of the present invention; In the figure: 1. dial; 11. pointer plate; 12. gear 1; 13. rotating shaft; 14. sleeve; 141. scroll spring; 2. density chamber; 21. pressure plate; 211. sealing ring; 212. fixing rod; 213. connecting rod; 214. tooth plate; 215. gear 2; 216. fixing block; 217. sphere 1; 218. extrusion rod; 22. sliding rod; 221. limiting block; 23. gas detection disk; 231. blocking block; 24. motor; 241. output rod; 242. electromagnetic plate; 25. disc; 251. plum blossom block; 26. toothed disc; 261. plum blossom groove; 262. threaded rod; 27. sphere 2; 28. elastic spring; 3. connecting pipe; 4. air pipe. DETAILED DESCRIPTION

[0014] The following is a further non-limiting detailed description of the technical solution of the present invention in conjunction with the preferred embodiments and the accompanying drawings. 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.

[0015] See also Figure 1-Figure 8 The present invention provides a technical solution: an SF6 gas wireless remote transmission density meter based on the Internet of Things, comprising a dial 1, a density cavity 2, a connecting pipe 3, an air pipe 4 and a density wireless transmission system, a pointer disk 11 is installed on the middle bearing of the dial 1, a gear 12 is fixed on the front side of the pointer disk 11, a rotating shaft 13 is fixed on the front side of the gear 12, a sleeve 14 is sleeved on the outer side of the rotating shaft 13, the sleeve 14 is fixedly installed on the inner wall of the dial 1, a volute spring 141 is arranged inside the sleeve 14, and the rotating shaft 13 and the sleeve 14 are connected by the volute spring 141; The density chamber 2 is connected to the bottom of the dial 1 through the connecting pipe 3, and the two are interconnected. The air pipe 4 is connected to the bottom of the density chamber 2 and is connected to the external SF6 circuit breaker pipeline. The inner wall of the density chamber 2 is provided with a pressure plate 21. The outer side of the pressure plate 21 is sleeved with a sealing ring 211, and the pressure plate 21 is slidably connected to the inner wall of the density chamber 2 through the sealing ring 211. The upper part of the pressure plate 21 is connected with a fixing rod 212. The upper end bearing of the fixing rod 212 is connected with a connecting rod 213. The connecting rod 213 is inserted into the interior of the connecting pipe 3, and a tooth plate 214 is fixed to the upper end. The gear 12 and the tooth plate 214 are meshed with each other. The SF6 gas in the SF6 circuit breaker enters the air pipe 4 through the pipeline, and then enters the density chamber 2 through the air pipe 4. The air pressure generated by the high-density SF6 gas pushes the pressure plate 21 to move upward, driving the sealing ring 211 to move upward. By setting the sealing ring 211, gas leakage can be avoided, which may lead to inaccurate density data monitoring. At the same time, the pressure plate 21 drives the connecting rod 213 to move upward through the fixed rod 212, and the connecting rod 213 drives the tooth plate 214 to move upward. The tooth plate 214 drives the gear 12 to rotate through meshing, and the gear 12 drives the pointer plate 11 and the rotating disk 11. The shaft 13 rotates synchronously, and the rotating shaft 13 rotates in the sleeve 14, thereby pressing the volute spring 141 to deform under force. The greater the density of SF6 gas, the greater the pressure, so that the pointer plate 11 rotates to the corresponding value and stops. The density value of SF6 is monitored through the conversion of pressure and density, and the density data is transmitted through the density wireless transmission system to realize wireless monitoring. When the gas density decreases, the volute spring 141 generates a reaction force to push the rotating shaft 13 to rotate in the opposite direction, and the density value decreases. The monitoring accuracy is high and it is more sensitive. The overall structure is simple and the manufacturing cost is low.

[0016] Through holes are provided on both sides of the pressure plate 21, and sliding rods 22 are slidably connected in the through holes. The bottom end of the sliding rod 22 is fixed to the bottom of the inner wall of the density chamber 2, and the outer side of the upper end is slidably connected to a gas detection disk 23, which is located above the pressure plate 21; A motor 24 is fixed on the upper inner wall of the density chamber 2, and an output rod 241 is fixedly connected to the output end of the motor 24. A disc 25 is connected to the outer side of the output rod 241, and a toothed disc 26 is connected to the lower side of the disc 25. A gear 215 is fixed to the outer side of the fixed rod 212, and the gear 215 and the toothed disc 26 are meshed with each other. A countersunk hole is provided on the surface of the pressure plate 21, and the fixed rod 212 is inserted into the countersunk hole, and a fixed block 216 is fixed at the lower end. A plurality of spheres 217 are evenly fixed on the outer side of the fixed block 216. A plurality of sliding holes are provided inside the pressure plate 21, and an extrusion rod 218 is slidably connected in the sliding holes. The outer end of the extrusion rod 218 is fixed to the sealing ring 211, and the inner end is spherical. After the fixed block 216 rotates, the sphere 217 and the spherical part of the extrusion rod 218 contact each other.

[0017] A gas detection module and a control module are provided inside the gas detection disk 23. The gas detection module is used to detect whether there is SF6 gas above the pressure plate 21. The control module is used to drive the motor 24 to operate when there is SF6 gas above the pressure plate 21. When the gas detection disk 23 detects SF6 gas, it indicates that a gas leak occurs at the sealing ring 211. At this time, the motor 24 is driven to operate through the control module. The motor 24 drives the disc 25 to rotate through the output rod 241. The disc 25 drives the toothed disc 26 to rotate. The toothed disc 26 drives the gear 215 to rotate through meshing, thereby driving the fixed rod 212 to rotate through the bearing. When the fixed rod 212 rotates, it drives the fixed block 216 at the bottom to rotate in the countersunk hole, and drives the ball 1 217 to rotate around its center. When the ball 1 217 rotates to contact the spherical part of the extrusion rod 218, the extrusion rod 218 is forced to slide in the sliding hole, and the other end thereof squeezes the middle part of the sealing ring 211. As the rotation force of the motor 24 increases, the extrusion rod 218 squeezes the sealing ring 211. 1, the squeezing force in the middle part of the sealing ring 211 is increased, and the rotation force of the motor 24 is controlled to control the force in the middle of the sealing ring 211, so that the sealing ring 211 maintains the sealing effect, and avoids gas leakage and inaccurate SF6 gas density monitoring. At the same time, when the sealing ring 211 moves up and down, the friction between the inner wall of the density chamber 2 causes wear. By squeezing the middle part of the sealing ring 211, wear compensation can be performed to ensure high-strength sealing. At the same time, by controlling the rotation force of the motor 24, the squeezing force between the sealing ring 211 and the inner wall of the density chamber 2 is large, which causes movement obstruction and affects density monitoring. By squeezing only the middle part of the sealing ring 211, the upper and lower parts of the sealing ring 211 can be expanded and deformed toward the upper and lower sides, and the fit between the inner wall of the density chamber 2 and the pressure plate 21 is high.

[0018] A plum blossom groove 261 is provided on the top of the toothed disc 26, a plum blossom block 251 is fixed to the bottom of the disc 25, and the plum blossom block 251 is embedded in the plum blossom groove 261, a threaded rod 262 is fixed to the bottom of the toothed disc 26, and a threaded hole is provided on the surface of the pressure plate 21, and is threadedly connected to the threaded rod 262; Bumps are fixed on the left and right sides of the output rod 241, a groove is set in the middle of the disk 25, and the groove is slidably connected to the bumps of the output rod 241. An electromagnetic plate 242 is fixed above the output rod 241. The electromagnetic plate 242 is magnetic when powered on. The disk 25 is made of metal, and the electromagnetic plate 242 is electrically connected to the inside of the motor 24.

[0019] Blocks 231 are fixed on both the left and right sides of the upper part of the gas detection disk 23. Holes are provided on both the left and right sides of the upper part of the density chamber 2, and the block 231 is slidably connected in the holes. A plurality of spheres 27 are provided on the upper part of the disk 25 and the lower part of the gas detection disk 23. After the disk 25 moves upward, the spheres 27 below the gas detection disk 23 and the spheres 27 above the disk 25 contact each other. A limit block 221 is fixed on the outer side of the slide bar 22, and an elastic spring 28 is fixed between the upper side of the limit block 221 and the bottom of the gas detection disk 23; When the motor 24 rotates, the connection between the protrusion of the output rod 241 and the middle groove of the disc 25 can smoothly drive the disc 25 to rotate, and the disc 25 fits with the plum blossom groove 261 of the toothed disc 26 through the plum blossom block 251 at the bottom, thereby driving the toothed disc 26 to rotate, and the toothed disc 26 drives the bottom threaded rod 262 to rotate in the threaded hole. When the sealing compensation of the sealing ring 211 is completed, the current in the motor 24 energizes the electromagnetic plate 242, so that the electromagnetic plate 242 generates magnetic force, and the magnetic force attracts the metal disc 25. The disc 25 moves upward on the protrusion of the output rod 241 through the groove, so that the plum blossom block 251 is out of contact with the plum blossom groove 261, and due to the connection between the threaded rod 262 and the threaded hole, the position of the toothed disc 26 remains unchanged, thereby keeping the extrusion rod 218 against the sealing ring 211 The extrusion pressure, when the disc 25 moves upward, the sphere 27 above the disc 25 contacts the sphere 27 below the gas detection disc 23. At this time, the motor 24 continues to rotate, and drives the sphere 27 above it to rotate around the center through the disc 25. The sphere 27 on the disc 25 continuously contacts and then separates from the sphere 27 below the gas detection disc 23, so that the gas detection disc 23 continuously jumps up and down. Under the action of the limit block 221, the elastic spring 28 continuously deforms and resets, and the gas detection disc 23 drives the blocking block 231 to continuously jump up and down. When the blocking block 231 jumps upward, the hole opens, and the gas above the pressure plate 21 is circulated through the hole, so that the gas above the pressure plate 21 can be replaced after the gas leaks, so as to avoid affecting the subsequent detection of SF6 gas.

[0020] The outer surface of the slide bar 22 is in contact with the inner walls of the through holes on the left and right sides of the pressure plate 21; When the gas detection disk 23 bounces up and down, the elastic spring 28 causes the gas detection disk 23 to vibrate, and the vibration is transmitted to the pressure plate 21 through the sliding rod 22, and finally transmitted to the sealing ring 211, which can make the sealing ring 211 and the pressure plate 21 and the inner wall of the density chamber 2 slightly loose, so as to avoid the large squeezing force of the squeezing rod 218 on the sealing ring 211 and the large fitting force of the sealing ring 211 on the inner wall of the density chamber 2, resulting in the sealing ring 211 sliding up and down along the inner wall of the density chamber 2 Unsmoothly, preventing the data accuracy of gas density monitoring from being affected, and playing a role in ensuring the monitoring quality.

[0021] The density wireless transmission system includes a density measurement module and a wireless transmission module. The density measurement module is electrically connected to the wireless transmission module. The density measurement module is used to measure the density of SF6 gas according to the pressure of SF6 gas, and the density value corresponds to the scale value corresponding to the rotation of the pointer of the dial 1. The wireless transmission module is used to transmit the density value of SF6 gas to the terminal through wireless signals; The conversion method of SF6 gas density value is: , is the SF6 gas density value, P is the SF6 gas pressure, M is the molar mass of SF6 gas, R is the constant of SF6 gas, and T is the absolute temperature of SF6 gas. That is, the greater the pressure of SF6 gas, the greater its density. The two are in a proportional relationship. By transmitting SF6 gas density data through the wireless transmission module, the SF6 gas density can be monitored in real time. The operator can judge the insulation performance, arc extinguishing performance and life of the circuit breaker through the density value.

[0022] In the description of the present invention, it is necessary to understand that the terms "up", "down", "front", "back", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0023] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features can be replaced by equivalents, and these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An SF6 gas wireless remote transmission density meter based on the Internet of Things, comprising a dial (1), a density chamber (2), a connecting pipe (3), a gas pipe (4) and a density wireless transmission system, characterized in that: A pointer disk (11) is mounted on the middle bearing of the dial (1), a gear 1 (12) is fixed on the front side of the pointer disk (11), a rotating shaft (13) is fixed on the front side of the gear 1 (12), a sleeve (14) is sleeved on the outer side of the rotating shaft (13), the sleeve (14) is fixedly mounted on the inner wall of the dial (1), a spiral spring (141) is arranged inside the sleeve (14), and the rotating shaft (13) and the sleeve (14) are connected via the spiral spring (141); The density chamber (2) is connected to the bottom of the dial (1) via a connecting pipe (3), and the two are interconnected. The air pipe (4) is connected to the bottom of the density chamber (2), and is connected to an external SF6 circuit breaker pipeline. A pressure plate (21) is provided on the inner wall of the density chamber (2). A sealing ring (211) is sleeved on the outer side of the pressure plate (21), and the pressure plate (21) is slidably connected to the inner wall of the density chamber (2) via the sealing ring (211). A fixing rod (212) is connected to the top of the pressure plate (21). A connecting rod (213) is connected to the upper end bearing of the fixing rod (212). The connecting rod (213) is inserted into the interior of the connecting pipe (3), and a tooth plate (214) is fixed to the upper end. The gear 1 (12) and the tooth plate (214) are meshed with each other.

2. The SF6 gas wireless remote transmission density meter based on the Internet of Things according to claim 1 is characterized in that: Through holes are provided on both left and right sides of the pressure plate (21), and sliding rods (22) are slidably connected in the through holes. The bottom end of the sliding rod (22) is fixed to the bottom of the inner wall of the density chamber (2), and the outer side of the upper end is slidably connected to a gas detection disk (23), and the gas detection disk (23) is located above the pressure plate (21); A motor (24) is fixed on the inner wall of the density chamber (2); an output rod (241) is fixedly connected to the output end of the motor (24); a disk (25) is connected to the outside of the output rod (241); a toothed disk (26) is connected below the disk (25); a second gear (215) is fixed to the outside of the fixed rod (212); the second gear (215) and the toothed disk (26) are meshed with each other; a countersunk hole is provided on the surface of the pressure plate (21); and the fixed rod (21) is provided with a plurality of holes. The pressure plate (21) is provided with a plurality of sliding holes inside, and each of the sliding holes is slidably connected with an extrusion rod (218). The outer end of the extrusion rod (218) is fixed to the sealing ring (211), and the inner end is spherical. After the fixed block (216) is rotated, the spherical body (217) and the spherical part of the extrusion rod (218) contact each other.

3. The SF6 gas wireless remote transmission density meter based on the Internet of Things according to claim 2 is characterized in that: A gas detection module and a control module are arranged inside the gas detection disk (23); the gas detection module is used to detect whether SF6 gas exists above the pressure plate (21); and the control module is used to drive the motor (24) to operate when SF6 gas exists above the pressure plate (21).

4. The SF6 gas wireless remote transmission density meter based on the Internet of Things according to claim 3 is characterized in that: A plum blossom groove (261) is provided on the top of the toothed disc (26); a plum blossom block (251) is fixed on the bottom of the disc (25), and the plum blossom block (251) is embedded in the plum blossom groove (261); a threaded rod (262) is fixed on the bottom of the toothed disc (26); and a threaded hole is provided on the surface of the pressure plate (21) and is threadedly connected to the threaded rod (262); The output rod (241) is fixed with protrusions on both sides thereof; a groove is provided in the middle of the disc (25) and is slidably connected to the protrusion of the output rod (241) through the groove; an electromagnetic plate (242) is fixed above the output rod (241); the electromagnetic plate (242) is magnetic when energized; the disc (25) is made of metal; and the electromagnetic plate (242) is electrically connected to the inside of the motor (24).

5. The SF6 gas wireless remote transmission density meter based on the Internet of Things according to claim 4 is characterized in that: Blocks (231) are fixed on both left and right sides of the upper part of the gas detection disk (23); holes are provided on both left and right sides of the upper part of the density chamber (2), and the block (231) is slidably connected in the holes; a plurality of second spheres (27) are provided on the upper part of the disk (25) and the lower part of the gas detection disk (23); after the disk (25) moves upward, the second spheres (27) below the gas detection disk (23) and the second spheres (27) above the disk (25) contact each other; A limit block (221) is fixed on the outer side of the slide bar (22), and an elastic spring (28) is fixed between the top of the limit block (221) and the bottom of the gas detection disk (23).

6. The SF6 gas wireless remote transmission density meter based on the Internet of Things according to claim 5 is characterized in that: The outer surface of the sliding rod (22) is in contact with the inner walls of the through holes on the left and right sides of the pressure plate (21).

7. The SF6 gas wireless remote transmission density meter based on the Internet of Things according to claim 6 is characterized in that: The density wireless transmission system comprises a density calculation module and a wireless transmission module. The density calculation module is electrically connected to the wireless transmission module. The density calculation module is used to calculate the density of SF6 gas according to the pressure of SF6 gas, and the density value corresponds to the scale value corresponding to the rotation of the pointer of the dial (1). The wireless transmission module is used to transmit the density value of SF6 gas to the terminal through wireless signals.

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