Safety pressure relief device for measuring calorific value of coal

Abstract

The utility model discloses a safety pressure relief device for coal calorific value measurement, and belongs to the technical field of pressure relief devices. The safety pressure relief device for coal calorific value measurement comprises a cylinder body, an oxygen and nitrogen deflation valve assembly, a sealing assembly and a connecting assembly, the oxygen and nitrogen deflation valve assembly is arranged above the cylinder body, the sealing assembly is arranged inside the oxygen and nitrogen deflation valve assembly, the connecting assembly is arranged outside the oxygen and nitrogen deflation valve assembly, and the oxygen and nitrogen deflation valve assembly is used for pressure relief. The sealing assembly is used for improving the sealing performance of the joint of the cartridge body and the oxygen and nitrogen deflation valve assembly, the connecting assembly is used for connecting the cartridge body and the oxygen and nitrogen deflation valve assembly, the upper end of the cartridge body communicates with a bullet, the oxygen and nitrogen deflation valve assembly comprises a valve body, and the sealing assembly comprises a sealing seat which is arranged in the valve body and close to the bottom end. The bottom end of the sealing seat is connected with a protruding block, the protruding block and the sealing seat are arranged outside the bullet in a sleeving mode, and a communicating hole is formed between the protruding block and the interior of the sealing seat.

Description

Technical Field

[0001] This utility model relates to the technical field of pressure relief devices, specifically a safety pressure relief device for measuring the calorific value of coal. Background Technology

[0002] With the continuous development of the modern chemical industry, determining the calorific value of coal is crucial in coal utilization and energy management. The calorific value significantly impacts the economic interests of both buyers and sellers, directly reflects the energy output of coal as fuel, and is a key indicator for assessing its energy value. It is used to calculate the efficiency of combustion equipment and optimize energy utilization. In the power industry, calorific value affects the power generation efficiency of coal-fired power plants; high-calorific-value coal can increase power generation and help power plants select suitable coal types and optimize fuel ratios. In the chemical industry, calorific value is an important parameter in coal chemical process design, affecting reaction conditions and product yield. Currently, the bomb calorimetry method is commonly used to determine the calorific value of coal. In this process, the coal sample inside the bomb burns violently under high-pressure oxygen conditions, releasing a large amount of energy while producing complex combustion products, including oxygen, nitrogen, carbon dioxide, sulfur dioxide, and solid fly ash. After the measurement is completed, the bomb needs to be depressurized.

[0003] Based on the above, the inventors have discovered the following problem: In the current process of depressurizing the cartridge, gas leakage is very likely to occur at the connection between the cartridge and the oxygen-nitrogen release valve. If leakage occurs during manual depressurization, it will cause injury to the operator.

[0004] Therefore, in view of this, we have studied and improved the existing structure and its shortcomings, and provided a safe pressure relief device for measuring the calorific value of coal, in order to achieve a more practical purpose. Utility Model Content

[0005] The purpose of this invention is to provide a safe pressure relief device for measuring the calorific value of coal, so as to solve the problems mentioned in the background art.

[0006] In view of the above problems, the technical solution proposed by this utility model is as follows:

[0007] A safety pressure relief device for measuring the calorific value of coal includes a cartridge body, an oxygen-nitrogen venting valve assembly, a sealing assembly, and a connecting assembly. The oxygen-nitrogen venting valve assembly is disposed above the cartridge body, the sealing assembly is disposed inside the oxygen-nitrogen venting valve assembly, and the connecting assembly is disposed outside the oxygen-nitrogen venting valve assembly. The oxygen-nitrogen venting valve assembly is used for pressure relief, the sealing assembly is used to improve the sealing performance at the connection between the cartridge body and the oxygen-nitrogen venting valve assembly, and the connecting assembly is used to connect the cartridge body and the oxygen-nitrogen venting valve assembly. The upper end of the cartridge body is connected to a projectile. The oxygen-nitrogen venting valve assembly includes a valve body, and the sealing assembly includes a sealing seat. The sealing seat is disposed inside the valve body near the bottom end, and a protrusion is connected to the bottom end of the sealing seat. The protrusion and the sealing seat are sleeved on the outside of the projectile, and a connecting hole is formed between the interior of the protrusion and the interior of the sealing seat. The inner wall of the connecting hole is clearance-fitted with the outer wall of the projectile.

[0008] Furthermore, both the sealing seat and the protrusion are made of corrosion-resistant elastic material, and the connecting hole is tapered, with a smaller top and a larger bottom.

[0009] The beneficial effect of adopting the above-mentioned further solution is that by setting the sealing seat and the protrusion as elastic materials, the inner wall of the sealing seat and the protrusion can better fit with the outer wall of the projectile, thereby further improving the sealing performance between the oxygen-nitrogen release valve assembly and the cartridge body.

[0010] Furthermore, a second annular groove is formed inside the top of the sealing seat, and a second magnetic ring is installed inside the annular groove. An annular plate is installed inside the valve body above the sealing seat. The bottom end of the annular plate is in contact with the top of the sealing seat, and a first annular groove is formed at the bottom end of the annular plate. A first magnetic ring is installed inside the first annular groove, and the first magnetic ring and the second magnetic ring are magnetically attracted to each other.

[0011] The beneficial effect of adopting the above-mentioned further solution is that by setting a first magnetic ring and a second magnetic ring, and the first magnetic ring and the second magnetic ring are magnetically attracted to each other, the connection stability between the sealing seat and the ring plate is improved. At the same time, the sealing seat and the ring plate are magnetically connected, so that the sealing assembly can be removed from the valve body after the subsequent pressure relief is completed, and the integrity of the sealing assembly can be checked.

[0012] Furthermore, an installation groove is provided on the outer side of the valve body near the bottom end. A hinge seat is hinged inside the installation groove. One end of the hinge seat is connected to a bottom cover. The top end of the bottom cover fits against the bottom end of the valve body. A groove is provided inside the bottom cover. The inner wall of the groove is clearance-fitted with the outer wall of the protrusion.

[0013] The beneficial effect of adopting the above-mentioned further solution is that by setting a bottom cover with a groove inside, the sealing component is limited between the bottom cover and the ring plate, preventing the sealing component from loosening. When it is necessary to remove the sealing component from the valve body, the bottom cover can be opened under the action of the hinge seat.

[0014] Furthermore, the bottom cover is connected to a connecting seat at the end away from the hinge seat, and the outer wall of the valve body is connected to connecting plates on both the front and back sides of the connecting seat. The connecting seat has a first threaded hole inside, and each of the pair of connecting plates has a second threaded hole inside. Bolts are threadedly connected between the first threaded hole and the pair of second threaded holes.

[0015] The beneficial effect of adopting the above-mentioned further solution is that, through the cooperation of the first threaded hole, the second threaded hole and the bolt, when the bolt is removed, the connection between the connecting seat and the pair of connecting plates is no longer fixed. Then, the bottom cover is opened downwards so that the first magnetic ring and the second magnetic ring can be separated by pulling the protrusion outwards, thereby removing the sealing assembly from the inside of the valve body.

[0016] Furthermore, an exhaust port is provided on one side of the valve body, and several threads are provided on the inner wall of the exhaust port. An air guide pipe is connected to the internal threads of the exhaust port. A threaded hole is provided at the upper end of the valve body, and a threaded rod is connected to the internal threads of the threaded hole. A valve core is provided at the bottom end of the threaded rod. The bottom end of the threaded rod is connected to the top end of the valve core through a bearing. The outer wall of the valve core is clearance-fitted with the inner wall of the valve body. A handwheel is connected to the top end of the threaded rod.

[0017] The beneficial effect of adopting the above-mentioned further solution is that by setting an exhaust port and connecting the exhaust port to the air guide pipe with internal threads, one end of the air guide pipe can be led to a safe place for subsequent venting operations. The threaded design of the inner wall of the exhaust port makes the connection of the air guide pipe tighter, preventing gas leakage. Through the cooperation of the handwheel, threaded rod and valve core, the threaded rod can be rotated by rotating the handwheel. Since the threaded rod and valve core are connected by a bearing, the valve core moves upward and no longer blocks the exhaust port, and achieves the pressure relief function under the action of the air guide pipe.

[0018] Furthermore, the connecting assembly includes two metal elastic strips and two retaining seats. The two metal elastic strips are respectively installed on the front and back of the valve body, and the two retaining seats are respectively installed on the top two sides of the cartridge body. The bottom end of each of the two metal elastic strips is connected to a retaining block. The retaining block is wedge-shaped on the side near the valve body. The two retaining seats have a retaining groove on the inside near the upper end of their opposite sides. The retaining block engages with the retaining groove.

[0019] The beneficial effect of adopting the above-mentioned further solution is that, through the combined use of the metal elastic strip, the locking block and the locking seat, since the side of the locking block away from the cylinder is wedge-shaped, it is easy for the locking block to engage with the locking seat, thereby realizing the connection between the oxygen-nitrogen venting valve assembly and the cartridge body. When it is necessary to disassemble the oxygen-nitrogen venting valve assembly from the cartridge body, the metal elastic strip is pushed outward to separate the locking block from the locking groove in the locking seat, and then the oxygen-nitrogen venting valve assembly is pulled upward to realize the disassembly between the oxygen-nitrogen venting valve assembly and the cartridge body.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows: The safety pressure relief device for measuring coal calorific value has a sealing seat and a protrusion fitted onto the outside of the projectile. The sealing seat and protrusion are made of corrosion-resistant elastic material, allowing them to fill the gap between the inner wall of the connecting hole and the outer wall of the projectile at the top of the projectile body through their elastic deformation. This effectively prevents gas leakage from the connection between the projectile body and the oxygen / nitrogen venting valve assembly, ensuring that the pressure inside the projectile body remains within a controllable range and guaranteeing the accuracy of the coal calorific value measurement. Simultaneously, when the pressure inside the projectile body changes, gas can enter and exit through the connecting hole. The internal thread of the exhaust port is connected to a gas guide pipe, leading one end of the gas guide pipe to a safe location for subsequent venting operations. Rotating the handwheel allows the threaded rod to rotate. Because the threaded rod and the valve core are connected by a bearing, the valve core moves upward and no longer blocks the exhaust port. Under the action of the air guide pipe, it achieves the pressure relief function, avoiding excessive pressure in the cartridge body and preventing safety problems. After the pressure relief is completed, when it is necessary to check the sealing assembly, push the metal elastic strip outward to separate the locking block from the locking groove in the locking seat. Then pull the oxygen-nitrogen release valve assembly upward to disassemble the oxygen-nitrogen release valve assembly from the cartridge body. Remove the bolts so that the connecting seat is no longer connected and fixed to the pair of connecting plates. Then open the bottom cover downward to facilitate the subsequent separation of the first magnetic ring and the second magnetic ring by pulling the protrusion outward. Then remove the sealing assembly from the inside of the valve body and check whether the sealing assembly is intact. Attached Figure Description

[0021] The accompanying drawings are provided to further understand this application and form part of the specification. They are used together with the embodiments of this application to explain this application and do not constitute a limitation thereof.

[0022] Figure 1 A three-dimensional structural schematic diagram of a safety pressure relief device for measuring the calorific value of coal provided by this utility model;

[0023] Figure 2 A cross-sectional view of the connecting assembly of a safety pressure relief device for measuring the calorific value of coal provided by this utility model;

[0024] Figure 3An exploded three-dimensional structural diagram of the oxygen and nitrogen venting valve assembly of a safety pressure relief device for measuring the calorific value of coal provided by this utility model;

[0025] Figure 4 A front cross-sectional schematic diagram of the oxygen and nitrogen venting valve of a safety pressure relief device for measuring the calorific value of coal provided by this utility model;

[0026] Figure 5 This is a three-dimensional structural diagram of the cartridge body of a safety pressure relief device for measuring the calorific value of coal provided by this utility model.

[0027] In the diagram: 1. Turret body; 2. Oxygen-nitrogen release valve assembly; 21. Valve body; 22. Exhaust port; 23. Ring plate; 24. First magnetic ring; 25. Hinge seat; 26. Bottom cover; 27. Groove; 28. Connecting seat; 29. ​​Connecting plate; 210. Bolt; 211. Threaded rod; 212. Handwheel; 213. Valve core; 3. Sealing assembly; 31. Sealing seat; 32. Protrusion; 33. Connecting hole; 34. Second magnetic ring; 4. Connecting assembly; 41. Metal elastic strip; 42. Locking block; 43. Locking seat. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Please see Figures 1-5This utility model provides a technical solution: a safety pressure relief device for measuring the calorific value of coal, comprising a cartridge body 1, an oxygen-nitrogen venting valve assembly 2, a sealing assembly 3, and a connecting assembly 4. The oxygen-nitrogen venting valve assembly 2 is disposed above the cartridge body 1, the sealing assembly 3 is disposed inside the oxygen-nitrogen venting valve assembly 2, and the connecting assembly 4 is disposed outside the oxygen-nitrogen venting valve assembly 2. The oxygen-nitrogen venting valve assembly 2 is used for pressure relief, the sealing assembly 3 is used to improve the sealing performance at the connection between the cartridge body 1 and the oxygen-nitrogen venting valve assembly 2, and the connecting assembly 4 is used to connect the cartridge body 1 and the oxygen-nitrogen venting valve assembly 2. The upper end of the cartridge body 1 is connected to a projectile head. The oxygen-nitrogen venting valve assembly 2 includes a valve body 21, and the sealing assembly 3 includes a sealing seat 31. The sealing seat 31 is disposed above the cartridge body 1. Near the bottom of the valve body 21, a protrusion 32 is connected to the bottom of the sealing seat 31. The protrusion 32 and the sealing seat 31 are fitted onto the outside of the projectile. A connecting hole 33 is provided between the inside of the protrusion 32 and the sealing seat 31. The inner wall of the connecting hole 33 is fitted with the outer wall of the projectile. The sealing seat 31 and the protrusion 32 are fitted onto the outside of the projectile. The sealing seat 31 and the protrusion 32 are made of corrosion-resistant elastic material, which allows the sealing seat 31 and the protrusion 32 to fill the gap between the inner wall of the connecting hole 33 and the outer wall of the projectile at the top of the projectile body 1 through their own elastic deformation. This effectively prevents gas from leaking from the connection between the projectile body 1 and the oxygen-nitrogen venting valve assembly 2, ensuring that the pressure inside the projectile body 1 is within a controllable range and ensuring the accuracy of the coal calorific value measurement.

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] Please see Figures 1-5This utility model provides a technical solution: the sealing seat 31 and the protrusion 32 are both made of corrosion-resistant elastic material, the connecting hole 33 is tapered with a smaller top and a larger bottom, a second annular groove is formed inside the top of the sealing seat 31, and a second magnetic ring 34 is installed inside the annular groove. An annular plate 23 is installed inside the valve body 21 above the sealing seat 31, the bottom end of the annular plate 23 is in contact with the top of the sealing seat 31, and a first annular groove is formed at the bottom end of the annular plate 23, and a first magnetic ring 24 is installed inside the first annular groove. The first magnetic ring 24 and the second magnetic ring 34 are connected. The valve body 21 is magnetically attracted to each other. A mounting groove is provided on the outer side of the valve body 21 near the bottom. A hinge seat 25 is hinged inside the mounting groove. One end of the hinge seat 25 is connected to a bottom cover 26. The top of the bottom cover 26 fits against the bottom of the valve body 21. A groove 27 is provided inside the bottom cover 26. The inner wall of the groove 27 is clearance-fitted with the outer wall of the protrusion 32. A connecting seat 28 is connected to the end of the bottom cover 26 away from the hinge seat 25. Connecting plates 29 are connected to both the front and back of the connecting seat 28 on the outer wall of the valve body 21. The interior of the connecting seat 28... A first threaded hole is provided, and a pair of connecting plates 29 each have a second threaded hole inside. Bolts 210 are threadedly connected between the first threaded hole and the pair of second threaded holes. By setting a first magnetic ring 24 and a second magnetic ring 34, and by magnetically attracting the first magnetic ring 24 and the second magnetic ring 34, the connection stability between the sealing seat 31 and the ring plate 23 is improved. At the same time, the sealing seat 31 and the ring plate 23 are magnetically connected, so that the sealing assembly 3 can be removed from the valve body 21 after the pressure is released, and the integrity of the sealing assembly 3 can be inspected. The sealing assembly 3 is positioned between the bottom cover 26 and the ring plate 23 by setting a bottom cover 26 with a groove 27 inside the bottom cover 26, thus preventing the sealing assembly 3 from loosening. When it is necessary to remove the sealing assembly 3 from the valve body 21, the bolt 210 is removed so that the connecting seat 28 is no longer connected and fixed to the pair of connecting plates 29. Then the bottom cover 26 is opened downward so that the first magnetic ring 24 and the second magnetic ring 34 can be separated by pulling the protrusion 32 outward, thereby removing the sealing assembly 3 from the valve body 21.

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] Please see Figures 1-5This utility model provides a technical solution: An exhaust port 22 is provided on one side of the valve body 21. Several threads are formed on the inner wall of the exhaust port 22. An air guide pipe is connected to the internal threads of the exhaust port 22. A threaded hole is provided at the upper end of the valve body 21. A threaded rod 211 is connected to the internal threads of the threaded hole. A valve core 213 is provided at the bottom end of the threaded rod 211. The bottom end of the threaded rod 211 and the top end of the valve core 213 are connected by a bearing. The outer wall of the valve core 213 is clearance-fitted with the inner wall of the valve body 21. A handpiece is connected to the top end of the threaded rod 211. The wheel 212 and the connecting assembly 4 include two metal elastic strips 41 and two retainers 43. The two metal elastic strips 41 are respectively installed on the front and back of the valve body 21, and the two retainers 43 are respectively installed on both sides of the top of the cartridge body 1. The bottom end of each of the two metal elastic strips 41 is connected to a retaining block 42. The retaining block 42 is wedge-shaped on the side near the valve body 21. The inside of the opposite side of each retainer 43 is provided with a retaining groove near the upper end. The retaining block 42 engages with the retaining groove. An exhaust port 22 is provided, and the internal thread of the exhaust port 22 is... Connect the vent pipe and lead one end of it to a safe location for subsequent venting operations. The threaded design on the inner wall of the exhaust port 22 ensures a tighter connection of the vent pipe, preventing gas leakage. Through the coordinated use of the handwheel 212, threaded rod 211, and valve core 213, rotating the handwheel 212 causes the threaded rod 211 to rotate. Since the threaded rod 211 and valve core 213 are connected by a bearing, the valve core 213 moves upward, no longer blocking the exhaust port 22, and achieves pressure relief under the action of the vent pipe. The metal elastic strip 41, the locking block 42, and the locking seat 43 work together. Since the side of the locking block 42 away from the cylinder is wedge-shaped, it is easy for the locking block 42 to engage with the locking seat 43, thereby realizing the connection between the oxygen-nitrogen venting valve assembly 2 and the cartridge body 1. When it is necessary to disassemble the oxygen-nitrogen venting valve assembly 2 from the cartridge body 1, the metal elastic strip 41 is pushed outward to separate the locking block 42 from the locking groove in the locking seat 43, and then the oxygen-nitrogen venting valve assembly 2 is pulled upward to realize the disassembly between the oxygen-nitrogen venting valve assembly 2 and the cartridge body 1.

[0034] Specifically, the working principle of this safety pressure relief device for measuring coal calorific value is as follows: During use, the internal thread of the exhaust port 22 is connected to a gas guide pipe. One end of the gas guide pipe is led to a safe location for subsequent venting operations. The sealing seat 31 and protrusion 32 are fitted onto the outside of the projectile. Since the sealing seat 31 and protrusion 32 are made of corrosion-resistant elastic material, they can fill the gap between the inner wall of the connecting hole 33 and the outer wall of the projectile at the top of the projectile body 1 through their own elastic deformation. This effectively prevents gas leakage from the connection between the projectile body 1 and the oxygen / nitrogen venting valve assembly 2, ensuring that the pressure inside the projectile body 1 remains within a controllable range and guaranteeing the accuracy of the coal calorific value measurement. Simultaneously, when the pressure inside the projectile body 1 changes, gas can enter and exit through the connecting hole 33. The operator can rotate the threaded rod 211 by rotating the handwheel 212. Because the threaded rod 21... The valve core 213 and the valve 1 are connected by a bearing, so that the valve core 213 moves upward and no longer blocks the exhaust port 22. Under the action of the air guide pipe, the pressure relief function is realized to avoid the safety problem caused by excessive pressure in the cartridge body 1. The pressure relief function is realized. When the sealing assembly 3 needs to be checked after the pressure relief is completed, the metal elastic strip 41 is pushed outward to separate the locking block 42 from the locking groove in the locking seat 43. Then, the oxygen-nitrogen release valve assembly 2 is pulled upward to realize the disassembly between the oxygen-nitrogen release valve assembly 2 and the cartridge body 1. The bolt 210 is removed so that the connecting seat 28 and the pair of connecting plates 29 are no longer connected and fixed. Then, the bottom cover 26 is opened downward so that the first magnetic ring 24 and the second magnetic ring 34 can be separated by pulling the protrusion 32 outward. Then, the sealing assembly 3 can be taken out from the inside of the valve body 21 to check whether the sealing assembly 3 is intact.

Claims

1. A safety pressure relief device for measuring the calorific value of coal, characterized in that, The device includes a cartridge body (1), an oxygen-nitrogen venting valve assembly (2), a sealing assembly (3), and a connecting assembly (4). The oxygen-nitrogen venting valve assembly (2) is located above the cartridge body (1). The sealing assembly (3) is located inside the oxygen-nitrogen venting valve assembly (2). The connecting assembly (4) is located outside the oxygen-nitrogen venting valve assembly (2). The oxygen-nitrogen venting valve assembly (2) is used for depressurization. The sealing assembly (3) is used to improve the sealing performance at the connection between the cartridge body (1) and the oxygen-nitrogen venting valve assembly (2). The connecting assembly (4) is used to connect the cartridge body (1) and the oxygen-nitrogen venting valve assembly (2). The upper end of the cartridge body (1) is connected to the projectile. The oxygen-nitrogen release valve assembly (2) includes a valve body (21). The sealing assembly (3) includes a sealing seat (31). The sealing seat (31) is located inside the valve body (21) near the bottom end. The bottom end of the sealing seat (31) is connected to a protrusion (32). The protrusion (32) and the sealing seat (31) are sleeved on the outside of the projectile. A connecting hole (33) is opened between the inside of the protrusion (32) and the sealing seat (31). The inner wall of the connecting hole (33) is clearance-fitted with the outer wall of the projectile.

2. The safety pressure relief device for measuring the calorific value of coal according to claim 1, characterized in that, The sealing seat (31) and the protrusion (32) are both made of corrosion-resistant elastic material, and the connecting hole (33) is tapered with a smaller top and a larger bottom.

3. The safety pressure relief device for measuring the calorific value of coal according to claim 2, characterized in that, The top of the sealing seat (31) has a second annular groove, and a second magnetic ring (34) is installed inside the annular groove. The valve body (21) has an annular plate (23) installed above the sealing seat (31). The bottom end of the annular plate (23) is in contact with the top end of the sealing seat (31), and the bottom end of the annular plate (23) has a first annular groove, and a first magnetic ring (24) is installed inside the first annular groove. The first magnetic ring (24) and the second magnetic ring (34) are magnetically attracted to each other.

4. The safety pressure relief device for determining the calorific value of coal according to claim 3, characterized in that, The valve body (21) has an installation groove on its outer side near the bottom. A hinge seat (25) is hinged inside the installation groove. One end of the hinge seat (25) is connected to a bottom cover (26). The top of the bottom cover (26) fits against the bottom of the valve body (21). A groove (27) is provided inside the bottom cover (26). The inner wall of the groove (27) is clearance-fitted with the outer wall of the protrusion (32).

5. A safety pressure relief device for determining the calorific value of coal according to claim 4, characterized in that, The bottom cover (26) is connected to a connecting seat (28) at the end away from the hinge seat (25). The outer wall of the valve body (21) is connected to connecting plates (29) on both the front and back sides of the connecting seat (28). The connecting seat (28) has a first threaded hole inside, and each of the pair of connecting plates (29) has a second threaded hole inside. A bolt (210) is threaded between the first threaded hole and the pair of second threaded holes.

6. A safety pressure relief device for determining the calorific value of coal according to claim 5, characterized in that, The valve body (21) has an exhaust port (22) on one side. The inner wall of the exhaust port (22) has several threads. The exhaust port (22) is connected to an air guide pipe through its internal threads. The upper end of the valve body (21) has a threaded hole. The threaded hole is connected to a threaded rod (211) through its internal threads. The bottom end of the threaded rod (211) is provided with a valve core (213). The bottom end of the threaded rod (211) is connected to the top end of the valve core (213) through a bearing. The outer wall of the valve core (213) is in clearance fit with the inner wall of the valve body (21). The top end of the threaded rod (211) is connected to a handwheel (212).

7. A safety pressure relief device for determining the calorific value of coal according to claim 6, characterized in that, The connecting assembly (4) includes two metal elastic strips (41) and two retainers (43). The two metal elastic strips (41) are respectively installed on the front and back of the valve body (21), and the two retainers (43) are respectively installed on the top two sides of the cartridge body (1). The bottom ends of the two metal elastic strips (41) are connected to retaining blocks (42). The retaining blocks (42) are wedge-shaped on the side near the valve body (21). The two retainers (43) have grooves on the opposite sides near the top. The retaining blocks (42) engage with the grooves.

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