A device for eliminating disturbances and stresses in the flow of material

Abstract

The present application relates to the technical field of industrial equipment connection and sealing, and particularly relates to a material passing device for eliminating disturbance and stress, which comprises a flexible connection section, a sealing cavity and a stress isolation flange connected in sequence. The flexible connection section is used for connecting a device generating disturbance, and absorbs dynamic disturbance and thermal stress through self-flexible deformation; a high-temperature metal sealing system is arranged in the sealing cavity, which is in liquid state at operating temperature and fills the gap between the sealing cavity and the material passing channel to form dynamic sealing, and solidifies to form static sealing after cooling; the stress isolation flange is used for connecting a static device, and cooperates with the flexible connection section to limit dynamic stress within the flexible connection section. The device effectively solves the problems of stress concentration and leakage of flange connection caused by device rotation.

Description

Technical Field

[0001] This invention relates to the field of industrial equipment connection and sealing technology, and in particular to a material conveying device for eliminating disturbances and stress. Background Technology

[0002] Existing material handling devices suffer from the following technical challenges: During the operation of high-temperature equipment such as rotary kilns, the rotation of the equipment generates continuous dynamic disturbance stress. Existing flange connection structures are too rigid and lack effective stress compensation mechanisms, leading to alternating loads at the connection points, making them prone to fatigue deformation and sealing failure. For example, if the rotary kiln's discharge end and cooling device are directly connected by a flange, the periodic vibration and thermal expansion differences caused by the kiln's rotation result in fretting wear on the flange mating surface, reducing bolt preload. This allows high-temperature materials or gases to leak from the connection, causing production interruptions and potential safety risks, severely restricting the stable long-term operation of the process. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a material conveying device that eliminates disturbances and stresses, solving the technical problem of leakage in the flange connection of the material conveying pipe caused by large disturbance stresses generated by equipment rotation.

[0004] To solve the above-mentioned technical problems, the specific contents of the present invention are as follows: This invention provides a material handling device for eliminating disturbances and stress, comprising: A flexible connection segment having opposing first and second ends, the first end of which is used to connect to an interface of a device that generates disturbances. A sealed cavity having a first end and a second end opposite to each other, the first end of the sealed cavity being connected to the second end of the flexible connecting section; A high-temperature metal sealing system, wherein the high-temperature metal sealing system is disposed inside the sealing cavity; A stress isolation flange, which is connected to the second end of the sealing cavity and is used for interface connection with stationary equipment; The flexible connection section is configured to absorb and compensate for dynamic disturbances and thermal stresses transmitted from the equipment through its own flexible deformation; the sealing cavity provides a sealing space to accommodate the high-temperature metal sealing system; the high-temperature metal sealing system is configured to fill and seal the gap between the sealing cavity and the material passage in a liquid state, and solidify to form a static seal after cooling; the stress isolation flange rigidly connects the material passage device to the stationary equipment and works in conjunction with the flexible connection section to limit dynamic stress at the flexible connection section, thereby completing stress isolation and sealing at the connection between the moving and stationary equipment.

[0005] Furthermore, in the material handling device for eliminating disturbances and stress described in this invention, the flexible connecting section is a metal corrugated pipe or an alloy braided hose.

[0006] Furthermore, in the material handling device for eliminating disturbances and stress described in this invention, the sealed cavity includes a cavity shell and an end cap, wherein the cavity shell and the end cap are connected to each other to form a sealed cavity.

[0007] Furthermore, in the material handling device for eliminating disturbances and stress described in this invention, the high-temperature metal sealing system is a low-melting-point metal sealant injected into the sealed cavity. The low-melting-point metal sealant is liquid at the operating temperature and solid at room temperature.

[0008] Furthermore, in the material handling device for eliminating disturbances and stress described in this invention, the low-melting-point metal sealant is a bismuth-based alloy or a tin-based alloy.

[0009] Furthermore, in the material handling device for eliminating disturbances and stress described in this invention, the stress isolation flange includes a flange body and bolt holes disposed on the flange body, and the flange body is fixedly connected to the second end of the sealing cavity.

[0010] Furthermore, in the material handling device for eliminating disturbances and stress described in this invention, the first end of the flexible connection section is provided with a first connecting flange for connecting to the interface of the equipment that generates the disturbance.

[0011] Furthermore, in the material handling device for eliminating disturbances and stress described in this invention, a first sealing gasket is provided between the first connecting flange and the equipment interface that generates the disturbance.

[0012] Furthermore, in the material handling device for eliminating disturbances and stress described in this invention, a second sealing gasket is provided between the stress isolation flange and the interface of the stationary equipment.

[0013] Furthermore, in the material handling device for eliminating disturbances and stress described in this invention, the device that generates disturbances is a rotary kiln, and the stationary device is a cooling device.

[0014] Beneficial effects of this invention; This invention effectively absorbs and compensates for dynamic disturbances and thermal stresses generated by equipment rotation through the flexible deformation of the flexible connection section. The sealing cavity provides a stable sealing space to accommodate the high-temperature metal sealing system. The system is liquid at the operating temperature and fills the gap between the sealing cavity and the material medium channel to form a dynamic pressure seal. After cooling, it solidifies to form a solid static seal. Combined with the synergistic effect of the stress isolation flange and the flexible connection section, the dynamic stress is limited to the range of the flexible connection section, thereby achieving reliable stress isolation and long-term sealing at the connection between the moving and stationary equipment. This avoids the leakage problems caused by stress concentration in existing flange connections. At the same time, the phase change characteristics of the high-temperature metal sealing system make the sealing structure maintenance-free. Attached Figure Description

[0015] To more clearly illustrate the technical solution of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of a structure.

[0017] Explanation of reference numerals in the attached drawings: 1-Flexible connection section, 2-Sealed cavity, 3-High-temperature metal sealing system, 4-Stress isolation flange. Detailed Implementation

[0018] To make the technical solution of the present invention clearer, the present invention will be clearly and completely described below with reference to specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. The present invention provided by various embodiments will be described in detail below with reference to the accompanying drawings. To better understand the purpose of the present invention, the present invention will be described in further detail below.

[0019] The present invention provides a material handling device for eliminating disturbances and stress, comprising: Flexible connection segment 1, the flexible connection segment 1 having a first end and a second end opposite to each other, the first end of the flexible connection segment 1 being used to connect to the interface of the device that generates the disturbance; A sealing cavity 2 has a first end and a second end opposite to each other, and the first end of the sealing cavity 2 is connected to the second end of the flexible connection section 1. A high-temperature metal sealing system 3 is disposed inside the sealing cavity 2; Stress isolation flange 4, which is connected to the second end of the sealing cavity 2 and is used for connection to the interface of stationary equipment; The flexible connection section 1 is configured to absorb and compensate for dynamic disturbances and thermal stresses transmitted from the equipment through its own flexible deformation; the sealing cavity 2 provides a sealing space to accommodate the high-temperature metal sealing system 3; the high-temperature metal sealing system 3 is configured to fill and seal the gap between the sealing cavity 2 and the material passage in a liquid state, and solidify to form a static seal after cooling; the stress isolation flange 4 is used to rigidly connect the material passage device to the stationary equipment, and works in conjunction with the flexible connection section 1 to limit dynamic stress at the flexible connection section 1, thereby completing stress isolation and sealing at the connection between the moving and stationary equipment.

[0020] The material handling device for eliminating disturbances and stress provided by this invention has its core structure arranged in series along the material flow direction. The flexible connection section 1, as the first section of the device, is constructed using a metal corrugated pipe or alloy braided flexible hose. The equipment connection end of the flexible connection section 1 is connected to the outlet of equipment such as a rotary kiln, which generates continuous vibration and thermal disturbance, via a first connecting flange. During equipment operation, the flexible connection section 1 directly absorbs and compensates for the multi-directional dynamic displacement and thermal expansion stress caused by the equipment rotation through the flexible deformation of its own wall surface.

[0021] The flexible section of the sealing cavity 2 is rigidly connected to the cavity connection of the flexible connecting section 1 via welding or flanges. The sealing cavity 2 is formed by assembling the cavity shell and end caps to create a sealed cavity surrounding the central material passage. The high-temperature metal sealing system 3 is injected into the sealed cavity of the sealing cavity 2 in a molten state, filling the annular gap between the cavity and the material passage. Under the high-temperature conditions of the rotary kiln, the high-temperature metal sealing system 3 maintains a liquid flow state, forming a dynamic pressure seal; when the equipment is shut down and the temperature drops, the high-temperature metal sealing system 3 changes to a solid phase, forming a maintenance-free static seal.

[0022] The flange body of the stress isolation flange 4 is fixedly connected to the flange connection end of the sealing cavity 2, and the bolt hole group of the stress isolation flange 4 is fastened to the interface flange of stationary components such as cooling equipment. Through the stress absorption of the flexible connection section 1 and the rigid anchoring of the stress isolation flange 4, dynamic stress is effectively limited within the deformation range of the flexible connection section 1, preventing stress from being transmitted to the stationary equipment. The entire device achieves long-term sealing and stress isolation at the connection between dynamic and static equipment through three technical means: the flexible compensation of the flexible connection section 1, the phase change sealing of the high-temperature metal sealing system 3, and the boundary isolation of the stress isolation flange 4.

[0023] The flexible connection section 1 is a metal bellows or alloy braided flexible hose. The sealed cavity 2 includes a cavity shell and an end cap, which are connected to form a sealed cavity. The high-temperature metal sealing system 3 is a low-melting-point metal sealant injected into the sealed cavity. The low-melting-point metal sealant is liquid at the operating temperature and solid at room temperature. The low-melting-point metal sealant is a bismuth-based alloy or a tin-based alloy. The stress isolation flange 4 includes a flange body and bolt holes on the flange body, which is fixedly connected to the second end of the sealed cavity 2. The first end of the flexible connection section 1 is provided with a first connecting flange for connecting to the interface of the equipment that generates disturbance. A first sealing gasket is provided between the first connecting flange and the interface of the equipment that generates disturbance. A second sealing gasket is provided between the stress isolation flange 4 and the interface of the stationary equipment. The equipment that generates disturbance is a rotary kiln, and the stationary equipment is a cooling device.

[0024] The flexible connection section 1 is preferably made of metal bellows, whose multi-layered trough structure provides composite deformation capability in both the axial and radial directions. Alternatively, when using alloy braided flexible hose, the inner PTFE lining provides both corrosion resistance and flexibility. The equipment connection end of the flexible connection section 1 is welded with a first connecting flange. An annular groove is formed on the flange plane to accommodate a first sealing gasket. A sealed connection is achieved with the rotary kiln head outlet flange via a high-strength bolt assembly.

[0025] The sealed cavity 2 is formed by connecting the outer shell, forged from low-carbon steel, and the stamped end cap via a circumferential weld. The cavity wall thickness is calculated based on the working pressure and a safety margin is included. The inner side of the outer shell is machined with a stepped assembly stop for positioning the material passage bushing. A temperature measuring hole is provided in the center of the end cap to monitor the phase change state of the high-temperature metal sealing system 3. A filling port is pre-installed at the top of the sealed cavity, which is sealed using a threaded sealing plug.

[0026] The high-temperature metal sealing system 3 uses a bismuth-based alloy as the low-melting-point metal sealant, with a liquidus temperature set at 180-220℃ and a solidus temperature controlled within the range of 150-180℃. During normal operation of the rotary kiln, the temperature conduction at the kiln head keeps the sealant in a liquid state, and the liquid metal forms an isobaric sealing layer inside the cavity. During kiln shutdown and maintenance, the temperature drops to room temperature, and the sealant solidifies to form a solid sealing ring with a mechanical strength of 80MPa. When a tin-based alloy is used as an alternative, antimony needs to be added to increase its hardness.

[0027] The flange body of stress isolation flange 4 is machined from a single forging. Bolt holes are arranged according to ASME B16.5 standard, and the flange sealing surface is finished to a roughness level of Ra3.2. The flange body and sealing cavity 2 are connected by butt welds, and stress-relief annealing is performed after welding. A spiral wound second sealing gasket is installed between stress isolation flange 4 and the interface of cooling equipment, and the bolt preload is applied in stages according to the gasket coefficient m value.

[0028] When the device is applied to the connection between a rotary kiln and a cooler, the flexible connection section 1 compensates for the combined displacement of the kiln body's radial runout ±15mm and axial thermal expansion ±5mm; the internal pressure fluctuation range of the sealing cavity 2 is maintained between -0.1 and +0.3MPa; and the mechanical stress transmitted by the stress isolation flange 4 is controlled below 40% of the material's yield strength through finite element analysis. The entire device has achieved 8000 hours of continuous operation without leakage in industrial verification.

[0029] This invention addresses the stress leakage problem caused by equipment rotation through a tiered processing principle. The flexible connection section 1, acting as a primary buffer unit, uses a bellows structure to convert the high-frequency vibrations transmitted from the equipment into elastic deformation of its own wall surface, much like installing a spring joint on a rigid pipe. This design restricts the radial runout and axial expansion and contraction of the rotary kiln within the deformation range of the flexible connection section 1, preventing direct transmission to the connection interface.

[0030] As a secondary sealing unit, the sealing cavity 2 contains a high-temperature metal sealing system 3 that exhibits unique phase transformation characteristics. When the kiln temperature rises to the operating range, the bismuth-based alloy melts into a liquid state, filling the microscopic gaps between the cavity and the material passage like mercury. This liquid metal sealing layer is adaptive, capable of redistributing pressure according to the deformation of the cavity. Once the kiln is stopped and cooled, the sealant solidifies into a metallic solid, forming a mechanically interlocked sealing structure that completely eliminates interface leakage.

[0031] The stress isolation flange 4 serves as the boundary anchoring function. Its forged flange body is rigidly connected to the cooling equipment through precision-machined bolt holes, forming a stable stress-blocking interface. This design cleverly isolates the dynamic stress field within the deformation range of the flexible connection section 1, ensuring that the stationary equipment end is always in a low-stress environment. The three components work like a relay race: the flexible connection section 1 absorbs most of the kinetic energy, the sealing cavity 2 blocks the leakage path of the medium, and the stress isolation flange 4 ultimately anchors the static end, together constructing a dynamic sealing system.

[0032] When the flexible connection section 1 uses a metal bellows, the metal bellows is made of multiple layers of stainless steel plates, and the trough structure is designed in a U-shape to provide axial and radial deformation capacity. The wall thickness of the bellows is selected from 0.5 mm to 1.5 mm according to the working pressure range. The outer shell and end cap of the sealed cavity 2 are made of low carbon steel plate by stamping. The two are connected by a continuous circumferential weld to form a sealed cavity. The inner side of the outer shell of the cavity has a stepped assembly stop machined to fix the material passage bushing. A temperature measuring hole is opened in the center of the end cap and a thermocouple is installed to monitor the temperature. The high-temperature metal sealing system 3 is a low-melting-point metal sealant injected into a sealed cavity. This sealant is specifically a bismuth-based alloy, with a composition of 50% bismuth, 30% lead, and 20% tin by weight. Its liquidus temperature is 210 degrees Celsius, and its solidus temperature is 170 degrees Celsius. During injection, the molten sealant is injected through the threaded injection port pre-drilled at the top of the sealing cavity 2 until the annular gap between the cavity and the material passage is filled, and then the sealing plug is tightened. The stress-isolation flange 4 has a flange body made of forged carbon steel. The bolt hole group is arranged according to Class 150 specifications in ASME B16.5. The flange sealing surface is precision machined to achieve a surface roughness of Ra 3.2 micrometers. The flange body and the second end of the sealing cavity 2 are connected by a full-penetration butt weld. After welding, a stress-relieving annealing treatment at 620 degrees Celsius is performed to eliminate residual welding stress. During installation, a first sealing gasket (a spiral wound metal-graphite gasket) is placed between the first connecting flange of the flexible connection section 1 and the rotary kiln interface flange. High-strength bolts are used to tighten the gasket diagonally to a preset torque value. A second sealing gasket (a flexible graphite composite gasket) is placed between the stress isolation flange 4 and the cooling device interface flange. The bolt preload is applied in stages according to the gasket coefficient. During operation, when the rotary kiln operating temperature rises above 200 degrees Celsius, the high-temperature metal sealing system 3 liquefies and forms an isobaric sealing layer within the cavity. After the equipment is shut down and cooled to room temperature, the sealant solidifies to form a solid sealing ring with a compressive strength of not less than 80 MPa, achieving long-term static sealing.

[0033] In Embodiment 1 of this invention, the flexible connection section 1 is implemented using a metal bellows. This metal bellows is hydraulically formed from multiple layers of austenitic stainless steel plates, with a U-shaped trough structure. The single-layer wall thickness is 0.8 mm, and the total wall thickness of the bellows is selected as 2.4 mm based on the design pressure. The axial compensation is not less than ±10 mm, and the radial swing compensation is not less than ±15 mm. A first connecting flange is welded to the first end of the flexible connection section 1. This first connecting flange is connected to the outlet flange of the rotary kiln via bolts. A first sealing gasket is placed between them. The first sealing gasket is a spiral wound metal gasket with an inner ring, and the gasket coefficient m is 3.0. The bolt preload torque is set to 300 Nm according to the gasket manufacturer's recommended value. The outer shell and end cap of the sealing cavity 2 are both formed by stamping and welding Q235B low-carbon steel plates. A continuous circumferential weld is formed by automatic argon arc welding. The inner side of the cavity shell is machined with a stepped assembly stop with a width of 10 mm for axial positioning and installation of the corundum ceramic bushing for the material passage. A hole is drilled and tapped in the center of the end cap to install a type K armored thermocouple for real-time monitoring of the internal temperature of the sealed cavity 2. The temperature measuring point is located at the central axis of the cavity. The high-temperature metal sealing system 3 is a low-melting-point metal sealant injected into this sealed cavity. This low-melting-point metal sealant is a bismuth-based alloy, specifically composed of 48% bismuth, 31.5% lead, 19% tin, and 1.5% antimony by mass fraction. The solidus temperature of this alloy is 168 degrees Celsius, and the liquidus temperature is 208 degrees Celsius. During the pouring operation, the alloy block is first heated to 250 degrees Celsius to completely melt it. Then, it is injected through the pre-drilled M20 threaded pouring port at the top of the sealed cavity 2. During the pouring process, the cavity is kept preheated to 150 degrees Celsius to prevent premature solidification of the molten metal. The molten alloy continues to overflow from the overflow port located at the highest point of the cavity, indicating that the annular gap between the cavity and the material passage has been completely filled. Then, a sealing plug with a copper gasket is screwed in to seal the pouring port. The flange body of the stress isolation flange 4 is machined from No. 20 forged steel. The bolt hole group is arranged according to the Class 150 pressure rating and RF sealing surface type in ASME B16.5 standard. The flange sealing surface has a surface roughness of Ra3.2 microns after precision machining. The flange body and the second end of the sealing cavity 2 adopt a single-sided V-groove and are fully penetrated butt welded using E5015 welding rods. Immediately after welding, heat treatment is performed. The heat treatment process involves heating to 620 degrees Celsius at a rate not exceeding 200 degrees Celsius per hour, holding at that temperature for two hours, and then cooling with the furnace to eliminate residual welding stress. The stress isolation flange 4 is bolted to the inlet flange of the cooling device, with a second sealing gasket between them. The second sealing gasket is a flexible graphite composite gasket. During initial installation, the bolts are tightened in three stages in a crisscross pattern, with the final preload reaching a gasket stress of 50 MPa. When the rotary kiln is put into operation, the kiln head temperature is conducted to the sealing cavity 2. When the cavity temperature exceeds 210 degrees Celsius, the high-temperature metal sealing system 3 completely liquefies, forming a fluid isobaric liquid sealing layer inside the cavity, which can adaptively compensate for minor gap changes.After the equipment is shut down, the temperature drops below 170 degrees Celsius, and the sealant gradually solidifies, eventually forming a dense solid sealing ring at room temperature. Its compressive strength is tested to be no less than 85 MPa, achieving long-term static sealing.

[0034] In Embodiment 2 of this invention, the flexible connection section 1 is an alloy braided hose. This alloy braided hose consists of an inner polytetrafluoroethylene liner, a middle layer of multi-layered 304 stainless steel wire interwoven reinforcement, and an outer metal mesh protective layer. The hose diameter matches the material passage, the rated working pressure is 1.6 MPa, and the minimum bending radius is 8 times the hose's outer diameter. The first end of the flexible connection section 1 is connected to the short circuit at the rotary kiln outlet via a compression fitting, facilitating installation and alignment. The sealing cavity 2 is integrally cast from cast steel and is divided into upper and lower halves, connected by flange bolts. Positioning pins and O-rings are used on the mating surfaces for sealing and positioning. This split structure facilitates the installation and maintenance of the internal material passage bushing. The cavity also forms an annular cavity around the material passage. The high-temperature metal sealing system 3 is another low-melting-point metal sealant injected into this cavity. The low-melting-point metallic sealant is a tin-based alloy, specifically composed of 90% tin, 7% antimony, and 3% copper by mass fraction. This alloy has a solidus temperature of 227°C and a liquidus temperature of 240°C. An observation mirror and resistance probe holes are provided on the side wall of the sealing cavity 2 to observe the melting state of the sealant and monitor its conductivity to indirectly determine the completion of the phase transition. During pouring, the tin-based alloy is heated to 260°C in an induction furnace and melted, then injected through a funnel-shaped pouring port on the side of the cavity. After pouring, a blind flange with a graphite gasket is installed to seal the pouring port. The stress isolation flange 4 has a flange body forged from 35CrMo alloy steel. The bolt hole assembly is machined according to the PN16 pressure rating and FM sealing surface type in the HG / T20592 standard. The flange sealing surface is hard chrome plated to improve wear resistance. The stress isolation flange 4 is connected to the second end of the sealing cavity 2 using a weld neck flange; no gasket is used between them, and sealing relies on metal-to-metal contact. The stress isolation flange 4 is connected to the interface flange of the downstream stationary equipment, i.e., the cooling device, via hinge bolts, facilitating quick disassembly and maintenance. A second sealing gasket, which is a corrugated composite gasket, is installed at the interface. In this embodiment, the flexible connection section 1, composed of alloy braided hose, mainly compensates for the multi-angle deflection vibration generated during the operation of the rotary kiln, and its flexibility is superior to that of metal bellows. When the equipment temperature rises above 240 degrees Celsius, the tin-based alloy sealant melts, and due to the good fluidity of the tin-based alloy, it can fill the gap more quickly. After the equipment cools down, the resulting solid sealing ring has high hardness and excellent wear resistance. The installation stress of the entire device is released through the natural bending deformation of the hose. The stress isolation flange 4 mainly bears the function of transferring the weight of the device to the support, and the dynamic stress is effectively limited within the hose section.

Claims

1. A material handling device for eliminating disturbances and stress, characterized in that, include: Flexible connection segment (1), the flexible connection segment (1) having a first end and a second end opposite to each other, the first end of the flexible connection segment (1) being used to connect to the interface of the device that generates the disturbance; A sealing cavity (2) has a first end and a second end opposite to each other, and the first end of the sealing cavity (2) is connected to the second end of the flexible connecting section (1); A high-temperature metal sealing system (3) is disposed inside the sealing cavity (2); Stress isolation flange (4), the stress isolation flange (4) is connected to the second end of the sealing cavity (2) and is used to connect to the interface of stationary equipment; The flexible connection section (1) is configured to absorb and compensate for dynamic disturbances and thermal stresses transmitted from the equipment through its own flexible deformation; the sealing cavity (2) is used to provide a sealing space to accommodate the high-temperature metal sealing system (3); the high-temperature metal sealing system (3) is configured to fill and seal the gap between the sealing cavity (2) and the material passage in a liquid state, and solidify to form a static seal after cooling; the stress isolation flange (4) is used to rigidly connect the material passage device to the stationary equipment, and works in conjunction with the flexible connection section (1) to limit the dynamic stress at the flexible connection section (1), thereby completing the stress isolation and sealing at the connection between the dynamic equipment and the stationary equipment.

2. The material handling device for eliminating disturbances and stress according to claim 1, characterized in that, The flexible connection section (1) is a metal corrugated pipe or an alloy braided hose.

3. The material handling device for eliminating disturbances and stress according to claim 1, characterized in that, The sealed cavity (2) includes a cavity shell and an end cap, the cavity shell and the end cap being connected to each other to form a sealed cavity.

4. The material handling device for eliminating disturbances and stress according to claim 3, characterized in that, The high-temperature metal sealing system (3) is a low-melting-point metal sealant injected into the sealed cavity. The low-melting-point metal sealant is liquid at the operating temperature and solid at room temperature.

5. The material handling device for eliminating disturbances and stress according to claim 4, characterized in that, The low-melting-point metal sealant is a bismuth-based alloy or a tin-based alloy.

6. The material handling device for eliminating disturbances and stress according to claim 1, characterized in that, The stress isolation flange (4) includes a flange body and bolt holes provided on the flange body, and the flange body is fixedly connected to the second end of the sealing cavity (2).

7. The material handling device for eliminating disturbances and stress according to any one of claims 1 to 6, characterized in that, The first end of the flexible connection section (1) is provided with a first connecting flange for connecting to the interface of the device that generates disturbance.

8. The material handling device for eliminating disturbances and stress according to claim 7, characterized in that, A first sealing gasket is provided between the first connecting flange and the interface of the device that causes the disturbance.

9. The material handling device for eliminating disturbances and stress according to any one of claims 1 to 6, characterized in that, A second sealing gasket is provided between the stress isolation flange (4) and the static equipment interface.

10. The material handling device for eliminating disturbances and stress according to any one of claims 1 to 6, characterized in that, The device that generates disturbance is a rotary kiln, and the stationary device is a cooling device.

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