Pressure relief mechanism for air pressure furnace cover

Abstract

The utility model is applicable to the technical field of air pressure furnaces, and provides a pressure relief mechanism for an air pressure furnace cover, which comprises an air pressure furnace upper pipe and an air pressure furnace lower pipe mounted at the bottom of the air pressure furnace upper pipe, the air pressure furnace cover is arranged at the top of the air pressure furnace upper pipe, and the side wall of the air pressure furnace upper pipe is connected with a furnace cover lifting assembly. The side wall of the air pressure furnace lower pipe is connected with the balance weight pressure relief assemblies, the furnace cover lifting assembly is connected with the top of the air pressure furnace cover, and the balance weight pressure relief assemblies are arranged on the two sides of the air pressure furnace lower pipe and arranged obliquely downwards in the horizontal direction. The device solves the problems that in the pressure relief process, a pressure relief mechanism cannot resist the impact of high-pressure gas in the furnace, the pressure relief effect is affected, and the pressure relief mechanism is damaged, and achieves the purposes of increasing the self balance weight, fully resisting the high-pressure impact in the gas pressure furnace, relieving the pressure of the gas pressure furnace and rapidly balancing the gas pressure inside and outside the cranium. And the pressure relief mechanism is prevented from being damaged by high-pressure airflow impact.

Description

Technical Field

[0001] The utility model relates to the technical field of gas pressure furnaces, and more specifically, to a pressure relief mechanism for a gas pressure furnace cover. Background Art

[0002] The gas pressure furnace is composed of an electric furnace heating system (including heating element and electric furnace body), a water cooling system, a vacuum system, an air filling and air pressure control system, an electrical control system and a working platform. The gas pressure furnace can perform hot isostatic pressing sintering treatment on EC ceramics (such as silicon carbide, zirconium oxide, aluminum oxide, silicon nitride, etc.) and metal materials (such as cemented carbide) under high pressure protective atmosphere conditions, which is beneficial to increase the sintering density of the material and improve the mechanical properties of the material.

[0003] During the sintering process of the gas pressure furnace, the air inside it heats up to form a pressure far greater than the atmospheric pressure. At the moment the gas pressure furnace cover is opened, the huge pressure difference between the inside and outside of the gas pressure furnace will cause the high pressure inside the furnace to have a huge impact on the furnace cover. On the one hand, it will cause damage to the furnace cover, and on the other hand, there is a great safety hazard. The impact of high temperature and pressure can easily cause injuries to operators.

[0004] Therefore, it is necessary to set a pressure relief mechanism at the gas pressure furnace cover to balance the pressure inside and outside the gas pressure furnace after the furnace cover is opened. However, most of the existing pressure relief mechanisms are suitable for use in environments with small capacity such as pipeline valves, and cannot be used in gas pressure furnaces with huge internal and external pressure differences. During the pressure relief process of the high-temperature gas in the gas pressure furnace, it will cause impact on the pressure relief mechanism, affecting the pressure relief effect, and even causing damage to the pressure relief mechanism itself. Utility Model Content

[0005] In view of the shortcomings of the prior art, the purpose of the utility model is to provide a pressure relief mechanism for a pressure furnace cover that can fully resist the high-pressure impact in the pressure furnace by increasing its own counterweight, ensure that the pressure relief mechanism can relieve the pressure of the pressure furnace and quickly balance the air pressure inside and outside the skull, and also avoid damage to the pressure relief mechanism caused by the impact of high-pressure airflow.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A pressure relief mechanism for a gas pressure furnace cover comprises a gas pressure furnace upper tube and a gas pressure furnace lower tube installed at the bottom of the gas pressure furnace upper tube, a gas pressure furnace cover is arranged on the top of the gas pressure furnace upper tube, a furnace cover lifting assembly is connected to the side wall of the gas pressure furnace upper tube, a counterweight pressure relief assembly is connected to the side wall of the gas pressure furnace lower tube, the furnace cover lifting assembly is connected to the top of the gas pressure furnace cover, and the counterweight pressure relief assembly is arranged on both sides of the gas pressure furnace lower tube and is arranged tilted downward in the horizontal direction.

[0008] The utility model is further configured as follows: the upper tube of the gas pressure furnace is configured as a hollow cylindrical structure, the gas pressure furnace cover is configured as a disc structure whose shape is adapted to the upper tube of the gas pressure furnace; the lower tube of the gas pressure furnace is configured as a hollow cylindrical structure, and its shape is adapted to the upper tube of the gas pressure furnace, and a plurality of groups of connecting bolts are arranged around the connection between the bottom of the upper tube of the gas pressure furnace and the lower tube of the gas pressure furnace, and the connecting bolts are connected to the top of the lower tube of the gas pressure furnace.

[0009] The utility model is further configured as follows: a group of lifting mounting frames are installed on the side wall of the upper tube of the gas pressure furnace, the lifting mounting frames are arranged in the horizontal direction, and a group of rotating blocks are respectively arranged at both ends; the furnace cover lifting assembly includes rotating connecting rods that are respectively rotatably connected to the two groups of rotating blocks, and the two groups of rotating connecting rods are rotatably connected to a connecting cross bar at one end away from the rotating block.

[0010] The utility model is further configured as follows: the connecting cross bar is configured as a cylindrical structure and is configured in the horizontal direction; a group of cross bar fixings are connected to the middle part of the connecting cross bar; the cross bar fixings are configured vertically to the top of the gas pressure furnace cover, and the bottom is connected to the top of the gas pressure furnace cover; a group of connecting blocks are respectively configured at both ends of the connecting cross bar, and the two groups of connecting blocks are symmetrically configured about the axis of the connecting cross bar; the bottom of the connecting block is configured to be in a shape that fits the top and side wall of the gas pressure furnace cover, and its bottom is connected to the gas pressure furnace cover.

[0011] By adopting the above technical solution, the connection between the cross bar and the gas pressure furnace cover is realized through the cross bar fixing parts, and the connection with the gas pressure furnace cover is further strengthened by two sets of connecting blocks, thereby ensuring that the gas pressure furnace cover can be driven to rotate synchronously during the rotation of the furnace cover lifting assembly to complete the opening and closing of the gas pressure furnace.

[0012] The utility model is further configured as follows: a group of pressure relief mounting frames are installed on the side wall of the lower tube of the gas pressure furnace, the pressure relief mounting frames are arranged in the horizontal direction, and a counterweight pressure relief assembly is installed on the top thereof; the counterweight pressure relief assembly includes two groups of counterweight mounting parts symmetrically arranged about the axis position of the pressure relief mounting frame, the bottoms of the two groups of counterweight mounting parts are respectively connected to the top of the pressure relief mounting frame, and circular through holes are opened in the horizontal direction therein, and a group of counterweight rotating rods are rotatably installed inside the counterweight mounting parts.

[0013] The utility model is further configured as follows: counterweight rotating frames are connected to both ends of the counterweight rotating rod, the counterweight rotating frames are configured as a rectangular frame structure, and are configured to be inclined downward in the horizontal direction; two groups of counterweight connecting parts are provided on the side wall of the counterweight rotating frame near one end of the counterweight rotating rod, the two groups of counterweight connecting parts are arranged in the vertical direction, and their tops are connected to the furnace cover lifting assembly, and a plurality of groups of counterweight blocks are sleeved on the end of the counterweight rotating frame away from the counterweight rotating rod, and each group of counterweight blocks is configured as a disc structure adapted to the shape of the counterweight connecting part.

[0014] By adopting the above technical solution, the connection between the counterweight pressure relief assembly and the furnace cover lifting assembly is achieved through the counterweight connector, and then through the connection between the furnace cover lifting assembly and the gas pressure furnace cover, a lever structure is formed between the counterweight rotating frame and the gas pressure furnace cover.

[0015] In summary, the present application includes at least one of the following beneficial technical effects:

[0016] 1. Through the connection between the counterweight connector and the furnace cover lifting assembly, a lever structure is formed between the counterweight rotating frame and the gas pressure furnace cover. The structure of the counterweight rotating frame itself can extend the lever arm of the lever structure. Only a small force needs to be applied to the end of the counterweight rotating frame to form a large torque at the connection with the gas pressure furnace cover.

[0017] 2. A counterweight block is arranged at the end of the counterweight rotating frame to significantly increase the deadweight of the counterweight pressure relief assembly, and further increase the torque formed at the connection of the gas pressure furnace cover when the end of the counterweight rotating frame rotates.

[0018] 3. The torque generated by rotating the counterweight rotating frame enables the counterweight pressure relief assembly to generate sufficient pressure to resist the impact caused by the pressure relief of the high-pressure airflow in the gas pressure furnace. While completing the pressure relief of the high-pressure gas in the gas pressure furnace and quickly balancing the intracranial and extracranial air pressure, it can also prevent the pressure relief mechanism from being damaged by the impact of the high-pressure airflow. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The utility model is a schematic structural diagram of a pressure relief mechanism for a gas pressure furnace cover.

[0020] Figure 2 The utility model is a schematic diagram of the explosion structure of the pressure relief mechanism for the gas pressure furnace cover.

[0021] Figure 3 It is a structural schematic diagram of the medium-pressure furnace cover and the furnace cover lifting assembly of the utility model.

[0022] Figure 4 It is a structural schematic diagram of the lower pipe and counterweight pressure relief assembly of the medium-pressure furnace of the utility model.

[0023] Figure 5 It is a structural schematic diagram of the utility model in which the pressure relief mechanism for the gas pressure furnace cover is in an open state.

[0024] Description of the accompanying drawings: 1. gas pressure furnace cover;

[0025] 2. Gas pressure furnace upper pipe; 21. Lifting mounting frame; 22. Rotating block; 23. Connecting bolts;

[0026] 3. Gas pressure furnace lower pipe; 31. Pressure relief mounting frame;

[0027] 4. Counterweight pressure relief assembly; 41. Counterweight mounting piece; 42. Counterweight rotating rod; 43. Counterweight rotating frame; 44. Counterweight connecting piece; 45. Counterweight block;

[0028] 5. Furnace cover lifting assembly; 51. Rotating connecting rod; 52. Connecting cross bar; 53. Connecting block; 54. Cross bar fixing piece. DETAILED DESCRIPTION

[0029] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0030] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0031] For example, see Figure 1-5 , the utility model provides the following technical solutions:

[0032] Specifically refers to a pressure relief mechanism for a gas pressure furnace cover, see Figure 1 and Figure 5 , including a gas pressure furnace cover 1, a gas pressure furnace upper tube 2, a gas pressure furnace lower tube 3, a counterweight pressure relief assembly 4 and a furnace cover lifting assembly 5. The gas pressure furnace cover 1 is installed on the top of the gas pressure furnace upper tube 2, and the gas pressure furnace can be opened and closed by rotating the gas pressure furnace cover 1. The bottom of the lower tube of the gas pressure furnace upper tube 2 is connected to the gas pressure furnace lower tube 3, and the bottom of the gas pressure furnace lower tube 3 is connected to the gas pressure furnace body. The side wall of the gas pressure furnace upper tube 2 is connected to the furnace cover lifting assembly 5, and the furnace cover lifting assembly 5 is connected to the top of the gas pressure furnace cover 1. The rotation of the furnace cover lifting assembly 5 can synchronously drive the gas pressure furnace cover 1 to rotate relative to the gas pressure furnace upper tube 2 to realize the opening and closing of the gas pressure furnace. The side wall of the gas pressure furnace lower tube 3 is connected to the counterweight pressure relief assembly 4, and the counterweight pressure relief assembly 4 is arranged on both sides of the gas pressure furnace lower tube 3 and is arranged downwardly in the horizontal direction. The counterweight pressure relief assembly 4 is connected to the furnace cover lifting assembly 5, and the furnace cover lifting assembly 5 can be driven to rotate synchronously by rotating the counterweight pressure relief assembly 4.

[0033] See also Figure 1-3, the upper tube 2 of the gas pressure furnace is set to a hollow cylindrical structure, and the lower tube 3 of the gas pressure furnace is set to a hollow cylindrical structure, and its shape is adapted to the upper tube 2 of the gas pressure furnace. A plurality of groups of connecting bolts 23 are arranged around the connection between the bottom of the upper tube 2 of the gas pressure furnace and the lower tube 3 of the gas pressure furnace, and the connecting bolts 23 are connected to the top of the lower tube 3 of the gas pressure furnace. The connection between the bottom of the upper tube 2 of the gas pressure furnace and the lower tube 3 of the gas pressure furnace is realized by the connecting bolts 23, and the high-pressure gas inside the gas pressure furnace can pass through the lower tube 3 of the gas pressure furnace to reach the top opening of the upper tube 2 of the gas pressure furnace to complete the discharge, thereby balancing the air pressure inside and outside the gas pressure furnace. The gas pressure furnace cover 1 is set to a disc structure with a shape adapted to the upper tube 2 of the gas pressure furnace. During the sintering process of the gas pressure furnace, closing the gas pressure furnace cover 1 can ensure good sealing inside the gas pressure furnace. After the sintering is completed, the gas pressure furnace cover 1 can be opened to release the high-pressure gas in the gas pressure furnace.

[0034] See also Figure 1-4 A set of lifting mounting frames 21 are installed on the side wall of the upper tube 2 of the gas pressure furnace. The lifting mounting frames 21 are arranged in the horizontal direction, and a set of rotating blocks 22 are respectively arranged at both ends. The rotating blocks 22 are connected to the furnace cover lifting assembly 5, and the connection between the upper tube 2 of the gas pressure furnace and the furnace cover lifting assembly 5 is realized through the lifting mounting frames 21 and the rotating blocks 22. A set of pressure relief mounting frames 31 are installed on the side wall of the lower tube 3 of the gas pressure furnace. The pressure relief mounting frames 31 are arranged in the horizontal direction, and a counterweight pressure relief assembly 4 is installed on the top thereof. The connection between the lower tube 3 of the gas pressure furnace and the counterweight pressure relief assembly 4 is realized through the pressure relief mounting frames 31.

[0035] See also Figure 2-4 The counterweight pressure relief assembly 4 includes a counterweight mounting member 41, a counterweight rotating rod 42, a counterweight rotating frame 43, a counterweight connecting member 44, and a counterweight block 45. The counterweight mounting member 41 is symmetrically arranged in two groups about the axis position of the pressure relief mounting frame 31. The bottoms of the two groups of counterweight mounting members 41 are respectively connected to the tops of the pressure relief mounting frame 31, and the connection between the counterweight pressure relief assembly 4 and the pressure relief mounting frame 31 is realized through the counterweight mounting member 41. Circular through holes are opened in the horizontal direction inside the two groups of counterweight mounting members 41, and a group of counterweight rotating rods 42 are rotatably installed inside the through holes, and the counterweight rotating rods 42 can rotate relative to the two groups of counterweight mounting members 41. Counterweight rotating frames 43 are connected to both ends of the counterweight rotating rods 42. The counterweight rotating frame 43 is arranged as a rectangular frame structure and is arranged tilted downward in the horizontal direction. The width of the counterweight rotating frame 43 is greater than the diameter of the upper tube 2 of the gas pressure furnace, and is arranged on the outer wall of the upper tube 2 of the gas pressure furnace. The counterweight rotating frame 43 can be rotated to drive the counterweight rotating rod 42 to rotate synchronously relative to the counterweight mounting member 41 .

[0036] See also Figure 2-4, two sets of counterweight connectors 44 are arranged on the side wall of one end of the counterweight rotating rod 42 of the counterweight rotating frame 43, and the two sets of counterweight connectors 44 are arranged in the vertical direction, and their side walls are in contact with the outer wall of the upper tube 2 of the gas pressure furnace. The tops of the two sets of counterweight connectors 44 are respectively connected to the furnace cover lifting assembly 5 to realize the connection between the counterweight pressure relief assembly 4 and the furnace cover lifting assembly 5. A plurality of sets of counterweight blocks 45 are sleeved on the end of the counterweight connector 44 away from the counterweight rotating rod 42, and each set of counterweight blocks 45 is set to a disc structure that matches the shape of the counterweight rotating frame 43. Through the connection between the counterweight connector 44 and the furnace cover lifting assembly 5, a lever structure is formed between the counterweight rotating frame 43 and the gas pressure furnace cover 1. By utilizing the sufficiently long force arm formed by the counterweight rotating frame 43 itself, the operator only needs to apply a small force at the end of the counterweight rotating frame 43 to form a large torque at the connection with the gas pressure furnace cover 1. The deadweight of the counterweight pressure relief assembly 4 is then increased by the counterweight block 45, further increasing the torque formed by the operator rotating the end of the counterweight rotating frame 43 at the connection point of the gas pressure furnace cover 1, so that the counterweight pressure relief assembly 4 can generate sufficient pressure to resist the impact caused by the pressure relief of the high-pressure airflow in the gas pressure furnace.

[0037] See also Figure 2-4 The furnace cover lifting assembly 5 includes a rotating connecting rod 51, a connecting cross bar 52, a connecting block 53, and a cross bar fixing piece 54. The rotating connecting rod 51 is provided in two groups, and each group of rotating connecting rods 51 is respectively connected to a group of rotating blocks 22, so that the furnace cover lifting assembly 5 can rotate relative to the lifting mounting frame 21. The two groups of rotating connecting rods 51 are rotatably connected to the connecting cross bar 52 at one end away from the rotating block 22, and the connecting cross bar 52 is provided as a cylindrical structure and is provided in the horizontal direction. A group of cross bar fixing pieces 54 are connected to the middle part of the connecting cross bar 52, and the cross bar fixing piece 54 is provided vertically to the top of the gas pressure furnace cover 1, and the bottom is connected to the top of the gas pressure furnace cover 1, and the connection between the connecting cross bar 52 and the gas pressure furnace cover 1 is realized through the cross bar fixing piece 54. A group of connecting blocks 53 are respectively provided at both ends of the connecting cross bar 52, and the two groups of connecting blocks 53 are symmetrically arranged about the axis position of the connecting cross bar 52, and the bottom of the connecting block 53 is provided in a shape that fits the top and side wall of the gas pressure furnace cover 1, and its bottom is connected to the gas pressure furnace cover 1. The connection between the gas pressure furnace cover 1 is further strengthened by two groups of connecting blocks 53, so as to ensure that the gas pressure furnace cover 1 can be driven to rotate synchronously during the rotation of the furnace cover lifting assembly 5, so as to complete the opening and closing of the gas pressure furnace, and enable the high pressure gas inside the gas pressure furnace to be depressurized and discharged. The bottom of the connecting block 53 is connected to the top of the counterweight connecting piece 44, so that the connecting block 53 can rotate synchronously with the counterweight connecting piece 44.

[0038] The working principle of a pressure relief mechanism for a gas pressure furnace cover provided by the utility model is as follows:

[0039] See also Figure 1-5After the sintering of the gas pressure furnace is completed, the operator can push the counterweight rotating frame 43 away from the end of one end of the gas pressure furnace, driving the counterweight rotating frame 43 and the counterweight rotating rod 42 to rotate relative to the counterweight mounting member 41. During the rotation of the counterweight rotating frame 43, the connection between the counterweight connecting member 44 and the connecting block 53 is used to synchronously drive the connecting block 53 and the gas pressure furnace cover 1 to rotate, thereby realizing the opening and closing of the gas pressure furnace cover 1. During the rotation of the connecting block 53, the two sets of rotating connecting rods 51 rotate synchronously to ensure that the gas pressure furnace cover 1 can be opened normally, thereby completing the pressure relief of the high-pressure gas of the gas pressure furnace.

[0040] During the pressure relief process of the gas pressure furnace, by utilizing the long lever arm structure formed between the counterweight rotating frame 43 and the gas pressure furnace cover 1, the operator only needs to apply a small force at the end of the counterweight rotating frame 43 to form a large torque at the connection with the gas pressure furnace cover 1. The deadweight of the counterweight pressure relief assembly 4 is increased by the counterweight block 45, further increasing the torque formed by the operator rotating the end of the counterweight rotating frame 43 at the connection with the gas pressure furnace cover 1. The torque generated by the counterweight rotating frame 43 enables the counterweight pressure relief assembly 4 to generate sufficient pressure to resist the impact caused by the pressure relief of the high-pressure airflow in the gas pressure furnace. While completing the pressure relief of the high-pressure gas in the gas pressure furnace and quickly balancing the intracranial and extracranial air pressure, it can also prevent the pressure relief mechanism from being damaged by the impact of the high-pressure airflow.

[0041] Obviously, the embodiments described above are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

Claims

1. A pressure relief mechanism for a gas pressure furnace cover, characterized in that: It comprises an air pressure furnace upper tube (2), and an air pressure furnace lower tube (3) installed at the bottom of the air pressure furnace upper tube (2). A gas pressure furnace cover (1) is arranged on the top of the gas pressure furnace upper tube (2), a furnace cover lifting assembly (5) is connected to the side wall of the gas pressure furnace upper tube (2), a counterweight pressure relief assembly (4) is connected to the side wall of the gas pressure furnace lower tube (3), the furnace cover lifting assembly (5) is connected to the top of the gas pressure furnace cover (1), and the counterweight pressure relief assembly (4) is arranged on both sides of the gas pressure furnace lower tube (3) and is arranged to be inclined downward in the horizontal direction.

2. A pressure relief mechanism for a gas pressure furnace cover according to claim 1, characterized in that: The gas pressure furnace upper tube (2) is configured as a hollow cylindrical structure, and the gas pressure furnace cover (1) is configured as a disc structure having a shape matching that of the gas pressure furnace upper tube (2); The gas pressure furnace lower tube (3) is configured as a hollow cylindrical structure, and its shape is adapted to the gas pressure furnace upper tube (2). A plurality of groups of connecting bolts (23) are arranged around the connection between the bottom of the gas pressure furnace upper tube (2) and the gas pressure furnace lower tube (3), and the connecting bolts (23) are connected to the top of the gas pressure furnace lower tube (3).

3. The pressure relief mechanism for a gas pressure furnace cover according to claim 1, characterized in that: A group of lifting and mounting frames (21) are installed on the side wall of the gas pressure furnace upper tube (2), and the lifting and mounting frames (21) are arranged in the horizontal direction, and a group of rotating blocks (22) are respectively arranged at both ends thereof; The furnace cover lifting assembly (5) comprises rotating connecting rods (51) respectively connected to the two groups of rotating blocks (22), and the ends of the two groups of rotating connecting rods (51) away from the rotating blocks (22) are connected to the connecting cross bars (52) at their ends.

4. A pressure relief mechanism for a gas pressure furnace cover according to claim 3, characterized in that: The connecting cross bar (52) is configured as a cylindrical structure and is arranged in the horizontal direction. A group of cross bar fixing members (54) are connected to the middle of the connecting cross bar (52). The cross bar fixing members (54) are arranged vertically on the top of the gas pressure furnace cover (1) and the bottom is connected to the top of the gas pressure furnace cover (1). A group of connection blocks (53) are respectively arranged at both ends of the connection cross bar (52), and the two groups of connection blocks (53) are symmetrically arranged about the axis of the connection cross bar (52). The bottom of the connection block (53) is arranged in a shape that fits the top and side wall of the gas pressure furnace cover (1), and the bottom is connected to the gas pressure furnace cover (1).

5. The pressure relief mechanism for a gas pressure furnace cover according to claim 1, characterized in that: A set of pressure relief mounting frames (31) are installed on the side wall of the gas pressure furnace lower tube (3), and the pressure relief mounting frames (31) are arranged in a horizontal direction, and a counterweight pressure relief assembly (4) is installed on the top thereof; The counterweight pressure relief assembly (4) comprises two groups of counterweight mounting members (41) symmetrically arranged about the axis of the pressure relief mounting frame (31), the bottoms of the two groups of counterweight mounting members (41) being respectively connected to the top of the pressure relief mounting frame (31), and circular through holes are provided in the interior thereof along the horizontal direction, and a group of counterweight rotating rods (42) are rotatably mounted in the counterweight mounting members (41).

6. A pressure relief mechanism for a gas pressure furnace cover according to claim 5, characterized in that: The two ends of the counterweight rotating rod (42) are connected to a counterweight rotating frame (43), and the counterweight rotating frame (43) is arranged as a rectangular frame structure and is arranged to be inclined downward in the horizontal direction; Two groups of counterweight connecting members (44) are arranged on the side wall of one end of the counterweight rotating frame (43) close to the counterweight rotating rod (42), and the two groups of counterweight connecting members (44) are arranged in the vertical direction and the tops thereof are connected to the furnace cover lifting assembly (5). A plurality of groups of counterweight blocks (45) are sleeved on one end of the counterweight rotating frame (43) away from the counterweight rotating rod (42), and each group of counterweight blocks (45) is arranged as a disc structure that matches the shape of the counterweight connecting member (44).

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