Adjustable automatic pressure relief device for vacuum induction melting furnace

Abstract

The present invention relates to the field of special metallurgy and discloses an adjustable automatic pressure relief device for a vacuum induction melting furnace, comprising: a main body formed as a hollow structure, an air inlet formed at the bottom, the air inlet is sealed and connected to the pressure relief port of the vacuum induction melting furnace cavity, and an air outlet is formed on the side wall; the upper part of the guide rod is inserted into the guide part, and its bottom end face is fixedly connected to the geometric center of the top of the bearing sealing platform, which is also used to transport or extract the balancing weight liquid; the vertical cover of the guide part is fixed on the through hole of the top wall of the main body; the sealing cover of the bearing sealing platform is installed on the top wall of the main body air inlet; the automatic balancing weight device is formed above the bearing sealing platform, including a balancing weight liquid cavity, a balancing weight liquid pipe and a pump, which can change its own weight according to external instructions to provide the gravity required for the bearing sealing platform to seal the main body air inlet. The present invention can accurately adjust the pressure relief threshold online without dismantling the equipment, can realize the linkage of passive pressure relief and active pressure reduction, and can significantly improve the working safety of the vacuum induction melting furnace.

Description

Technical Field

[0001] The invention relates to the field of special metallurgy, in particular to an adjustable automatic pressure relief device for a vacuum induction melting furnace. Background Art

[0002] Vacuum Induction Melting Furnace (VIM) is a device that uses electromagnetic induction heating to melt metals under vacuum conditions. It is widely used in the production of high-quality alloys, especially in the aerospace, medical, automotive and nuclear industries. The vacuum induction melting furnace uses medium-frequency induction heating technology to generate heat in conductive materials through an alternating electromagnetic field to achieve metal melting. The induction coil surrounds the crucible containing the metal to be melted. When the alternating current passes through the coil, it will generate induced eddy currents in the metal, rapidly heating up and melting the metal.

[0003] The vacuum induction melting furnace mainly includes the following components;

[0004] Furnace body: Provides a sealed vacuum environment and is usually made of materials that can withstand high temperatures and maintain vacuum integrity.

[0005] Medium frequency power supply: provides the power required for induction heating, including power supply, transformer and control circuit.

[0006] Vacuum system: Consists of a vacuum pump, vacuum gauge and valves, responsible for generating and maintaining a vacuum environment.

[0007] Cooling system: usually uses water cooling channels and fans to prevent overheating.

[0008] Electronic control system: monitors and controls temperature, vacuum degree and input power.

[0009] The working pressure of a vacuum induction melting furnace (VIM) is usually related to its design and operating conditions, refer to GB / T10067.35-2015 "Basic Technical Conditions for Electric Heating Devices Part 35: Medium Frequency Vacuum Induction Melting Furnace". It should be noted that the working pressure and operating conditions of the vacuum induction melting furnace should strictly comply with the corresponding safety standards and operating procedures to ensure the safety of equipment and personnel.

[0010] The vacuum degree requirement of the vacuum induction melting furnace is a key factor to ensure the smooth progress of the melting process and obtain high-quality molten metal. According to the standard JB / T 10551-2006 "Vacuum Technology Vacuum Induction Melting Furnace", the vacuum degree of the vacuum induction melting furnace usually needs to reach and be maintained within a certain range to meet the melting requirements of different metal materials. Different vacuum induction melting furnaces may have different specific vacuum degree requirements, which will vary according to the metal material being melted, the size of the furnace body, and the details of the melting process. Therefore, when the vacuum induction melting furnace is working, it is necessary to ensure that the vacuum degree is controlled within the appropriate range to achieve the best melting effect.

[0011] When a large amount of gas is generated when a malfunction occurs in the equipment inside the vacuum induction melting furnace cavity, the gas must be quickly discharged from the cavity to prevent safety accidents, which requires the installation of a pressure relief device. Existing pressure relief devices are generally fixed values, that is, they are set at a set value when leaving the factory and cannot be adjusted. If the set value needs to be adjusted, it is more troublesome. After stopping production, the existing pressure relief device needs to be removed and then replaced with a new one. Once the vacuum induction melting furnace is stopped, reheating, vacuuming and other operations will cause a lot of energy waste, which is not conducive to environmental protection.

[0012] In the case of different vacuum requirements due to different production environments (metal materials, furnace size, and details of the smelting process, etc.), the equipment has different tolerances for large amounts of gas generated by faults. If the existing technology is used for constant pressure relief, faults that do not exceed the safety margin may be mistakenly relieved, resulting in material and equipment losses and unnecessary costs. Correspondingly, with the advancement of technology, the accuracy required for pressure relief is getting higher and higher. Providing higher pressure relief accuracy can better control the production environment and improve product quality and production efficiency.

[0013] Accordingly, once pressure relief occurs, production must be stopped immediately, which will cause unnecessary losses of materials and energy, and is not conducive to environmental protection.

[0014] Chinese patent CN202222382099.9 discloses a gravity automatic pressure relief valve, which is used for vacuum induction melting furnace, including: the valve body of the automatic pressure relief valve is formed as a hollow structure, the top of which is formed with an automatic pressure relief valve bonnet, the bottom of which is formed with a first port, and one side of which is formed with a second port, which is fixed on the valve seat of the automatic pressure relief valve through the first port; the automatic pressure relief valve partition valve plate is located in the automatic pressure relief valve body, and the cover is installed on the first port; one end of the automatic pressure relief valve stem is vertically fixed on the automatic pressure relief valve partition valve plate, and the other end of the automatic pressure relief valve stem passes through the through hole on the automatic pressure relief valve bonnet and is inserted into the automatic pressure relief valve stem protective sleeve; the automatic pressure relief valve stem protective sleeve is fixed on the top of the automatic pressure relief valve bonnet; the automatic pressure relief valve stem can move vertically up and down in the automatic pressure relief valve stem protective sleeve, and the automatic pressure relief valve partition valve plate and the automatic pressure relief valve stem can form a seal to the first port by falling by gravity. This scheme provides a gravity automatic pressure relief valve with a fixed pressure relief value.

[0015] However, this solution still does not solve the defects of the existing technology:

[0016] First, this solution can only provide a fixed pressure relief value, and cannot provide a corresponding pressure relief value when the production environment changes. For example, different materials generate different amounts of gas and different speeds of gas generation, and the required pressure relief extremes are also different. Secondly, when the production environment changes, this solution can only provide different pressure relief values ​​by suspending production, disassembling the pressure relief valve, and adding or reducing the counterweight, which will cause production to stop. The shutdown of the vacuum induction melting furnace will cause energy waste and is not environmentally friendly.

[0017] Thirdly, the scheme only provides a fixed-value pressure relief, and can only passively relieve the pressure in the furnace, without active safety measures. For example, although gas is generated, it is still within the controllable range. It only needs to perform the corresponding vacuuming and exhaust in time, without starting the pressure relief to destroy the vacuum environment. If the pressure relief is started, it will cause unnecessary losses. Summary of the invention

[0018] A series of simplified concepts are introduced in the Summary of the Invention, which are all simplifications of the prior art in the field, and will be further described in detail in the Detailed Description of the Invention. The Summary of the Invention of the present invention does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0019] The technical problem to be solved by the present invention is to provide an adjustable automatic pressure relief device for a vacuum induction melting furnace, which can accurately adjust the pressure relief threshold online according to the smelting production environment (metal materials, size of the furnace body, details of the smelting process, etc.) without dismantling the equipment and can realize passive pressure relief and active pressure reduction linkage.

[0020] In order to solve the above technical problems, the present invention provides an adjustable automatic pressure relief device for a vacuum induction melting furnace, comprising:

[0021] The main body is formed into a hollow structure, with an air inlet formed at the bottom, the air inlet is sealed and connected to the pressure relief port of the vacuum induction melting furnace cavity, and an air outlet is formed on the side wall;

[0022] The guide rod is inserted into the through hole on the top wall of the main body, and its upper part is inserted into the guide part. It can move up and down in the through hole on the top wall of the main body and in the guide part, and its bottom end surface is fixedly connected to the geometric center of the top of the bearing sealing platform;

[0023] The guide rod is formed as a hollow tube passing through the through hole of the top wall of the main body, and its upper part is inserted into the guide part. It can move up and down in the through hole of the top wall of the main body and in the guide part. Its bottom end surface is fixedly connected to the geometric center of the top of the bearing sealing platform. It is also used to transport or extract the counterweight liquid, that is, the guide rod has both the guiding and infusion functions of the pipeline;

[0024] The guide part is vertically covered and fixed on the through hole on the top wall of the main body;

[0025] The sealing cover of the bearing sealing platform is installed on the air inlet of the main body;

[0026] An automatic weight balancing device is formed above the bearing and sealing platform, which can change its own weight according to external instructions to provide the bearing and sealing platform with the gravity required for sealing the air inlet of the main body;

[0027] The weight liquid cavity has an air port formed on its top wall for containing the weight liquid. In order to increase the weight as much as possible without increasing the volume, a salt solution can be selected as the weight liquid. However, the selection of a salt solution will cause the defect of salt deposition, and the weight liquid cavity and the weight liquid need to be calibrated regularly. Accordingly, the weight liquid cavity can also be cleaned during the shutdown phase to avoid the influence of salt deposition on the weight accuracy, such as water cleaning.

[0028] A counterweight liquid pipe, which is formed as a flexible pipeline connected to the top of the guide rod and communicates with the counterweight liquid cavity through the guide rod;

[0029] The pump is arranged on the supporting structure beside the adjustable automatic pressure relief device of the vacuum induction melting furnace, connected to the balancing liquid pipe, and delivers or extracts the balancing liquid to the balancing liquid cavity according to external instructions. The external instructions can be issued by the control system of the vacuum induction melting furnace, and the capacity of delivering or extracting the balancing liquid can be calibrated.

[0030] Preferably, the adjustable automatic pressure relief device of the vacuum induction melting furnace is further improved, further comprising:

[0031] An elastic buffer seal is formed between the bearing seal platform and the top wall of the main body air inlet.

[0032] Preferably, the adjustable automatic pressure relief device of the vacuum induction melting furnace is further improved, further comprising:

[0033] A first accommodating groove is formed around the main body air inlet on the top wall of the main body air inlet, and its bottom wall is formed into an arc surface;

[0034] The elastic buffer seal is interference-arranged in the first accommodating groove, and at least a portion of the elastic buffer seal is exposed from the first accommodating groove, the bottom of the cross section is formed into an arc surface adapted to the bottom wall of the first accommodating groove, and the top surface is formed into a plane;

[0035] The top of the elastic buffer seal forms surface contact with the bottom wall of the bearing seal platform.

[0036] In the closed state, the elastic buffer seal provides a good seal for the adjustable automatic pressure relief device of the vacuum induction melting furnace.

[0037] In the pressure relief state, a sudden airflow will be formed between the bearing sealing platform and the main body air inlet, which will push the bearing sealing platform away from the main body air inlet in the vertical direction, and at the same time form a lateral airflow between the bearing sealing platform and the main body air inlet. The elastic buffer seal is arranged in the first accommodating groove to prevent the elastic buffer seal from being blown away by the lateral airflow, so that it can be sealed again after pressure relief. This design cooperates with the automatic counterweight device to realize the continuous multiple use of the adjustable automatic pressure relief device of the vacuum induction melting furnace with different pressure relief thresholds.

[0038] Furthermore, the purpose of exposing at least part of the elastic buffer seal from the first accommodating groove is to avoid rigid contact between the bearing seal platform and the main body air inlet. In particular, after the counterweight has completed pressure relief, due to the action of the vacuum pumping device, the gas in the furnace is evacuated to form a vacuum environment again. If the bearing seal platform suddenly falls, the elastic buffer seal can effectively avoid damage caused by rigid contact between the bearing seal platform and the main body air inlet.

[0039] Preferably, the adjustable automatic pressure relief device of the vacuum induction melting furnace is further improved, further comprising:

[0040] A first accommodating groove is formed on the bottom wall of the bearing sealing platform, its position corresponds to surrounding the air inlet of the main body, and its top wall is formed into an arc surface;

[0041] The elastic buffer seal is arranged in the first accommodating groove with interference fit, and at least a part of the elastic buffer seal is exposed from the first accommodating groove, the top of the cross section is formed into an arc surface adapted to the bottom wall of the first accommodating groove, and the bottom surface is formed into a plane;

[0042] The bottom surface of the elastic buffer seal forms surface contact with the top wall of the main body air inlet.

[0043] Preferably, the adjustable automatic pressure relief device of the vacuum induction melting furnace is further improved, further comprising:

[0044] A second accommodating groove, which has a shape and position corresponding to the first accommodating groove, and is formed on the counterpart where the first accommodating groove is arranged;

[0045] The elastic buffer seal is arranged in the first accommodating groove or the second accommodating groove with interference, and the other side is arranged without interference. When the sealing cover of the bearing sealing platform is installed on the air inlet of the main body, at least part of the elastic buffer seal is exposed in the first accommodating groove and the second accommodating groove.

[0046] Opponents usually refer to other components used in conjunction with specific components in a mechanical system to jointly complete the function and movement of the machine. In the present invention, the top wall of the main body air inlet and the bottom wall of the bearing sealing platform are mutually opposing components.

[0047] The elastic buffer seal of the present invention forms a seal when the bearing seal platform contacts the air inlet of the main body. When the bearing seal platform falls, the elastic buffer seal plays a buffering role.

[0048] Preferably, the adjustable automatic pressure relief device of the vacuum induction melting furnace is further improved, further comprising:

[0049] A sensor is arranged between the bottom wall of the bearing sealing platform and the top wall of the main body air inlet, and is used to detect the change of the distance between the bottom wall of the bearing sealing platform and the top wall of the main body air inlet; if the sensor detects that the distance increases, it continuously sends a first trigger signal to the vacuum pumping system of the vacuum induction melting furnace, and the vacuum pumping system of the vacuum induction melting furnace continuously receives the first trigger signal and gradually increases the pumping speed until it reaches its working extreme value;

[0050] If it detects that the distance is reduced, it will continue to send a second trigger signal to the vacuum induction melting furnace vacuum system. The vacuum induction melting furnace vacuum system continues to receive the second trigger signal and gradually reduces the vacuum speed until the normal working requirements of the vacuum induction melting furnace are met.

[0051] It should be further explained that if there is no pressure relief, the distance between the bottom wall of the bearing sealing platform and the top wall of the main body air inlet will not change, and the sensor will not send any signal.

[0052] Preferably, the adjustable automatic pressure relief device of the vacuum induction melting furnace is further improved, further comprising:

[0053] If the sensor detects that the distance is greater than the first distance threshold, a third trigger signal is sent to the pump and the vacuum induction melting furnace vacuum pumping system. The pump immediately executes maximum power to extract the counterweight liquid upon receiving the third trigger signal, and the vacuum induction melting furnace vacuum pumping system immediately executes maximum power vacuum pumping upon receiving the third trigger signal.

[0054] The sensor detects that the distance is greater than the first distance threshold, which can be calibrated or specified, indicating that an uncontrollable gas surge has occurred, and a furnace explosion may occur later. Therefore, full exhaust is required, so the pressure relief device counterweight will be reduced as soon as possible, and vacuum will be drawn at full capacity at the same time.

[0055] The present invention can at least achieve the following technical effects:

[0056] 1. The present invention can provide different pressure relief thresholds according to different production environments (metal materials, size of furnace body, details of smelting process, etc.).

[0057] 2. The present invention can realize online adjustment of precise pressure relief threshold without dismantling equipment or even stopping production, thus avoiding waste of materials and energy caused by stopping production and being beneficial to energy conservation and environmental protection.

[0058] 3. The present invention can provide an accurate pressure relief threshold according to the production environment, avoid the fault that does not exceed the safety margin from being mistakenly relieved, avoid the waste of materials and energy caused by production stoppage, and is beneficial to energy conservation and environmental protection.

[0059] Correspondingly, higher pressure relief accuracy can better control the production environment and improve product quality and production efficiency.

[0060] 4. The present invention detects the distance between the bottom wall of the bearing sealing platform and the top wall of the main body air inlet through a sensor, determines whether passive pressure relief occurs and whether it is controllable based on the change in distance, and sends a trigger signal through the detected distance change to the vacuum induction melting furnace vacuum system to execute vacuuming, thereby realizing the linkage between passive pressure relief and active pressure reduction.

[0061] Once the passive pressure relief condition occurs, that is, the distance between the bottom wall of the bearing sealing platform and the top wall of the main body air inlet increases and is detected by the sensor, the sensor continues to send the first trigger signal to the vacuum induction melting furnace vacuum pumping system, and the vacuum induction melting furnace vacuum pumping system continues to receive the first trigger signal and gradually increases the pumping speed until it reaches its working limit. Correspondingly, this condition is considered that the increase in gas generated by the gas explosion is controllable, and the furnace will not explode, and the gas will be exhausted as soon as possible.

[0062] If the distance between the bottom wall of the bearing sealing platform and the top wall of the main air inlet decreases and is detected by the sensor, it is considered that the gas explosion is fully controllable under the coordination of passive pressure relief and active pressure relief, that is, when the amount of gas generated in the vacuum induction melting furnace is less than the amount of gas pumped by the vacuum system, there is no need to continue to release pressure to destroy the vacuum environment, and there is no need to stop production. The vacuum induction melting furnace vacuum pumping system continues to receive the second trigger signal and gradually reduces the vacuum pumping speed until it meets the normal working requirements of the vacuum induction melting furnace. Then a dynamic balance is formed between passive pressure relief and active vacuum pumping, and the production environment can be quickly restored without causing losses.

[0063] Accordingly, if the sensor detects that the distance is greater than the first distance threshold (which may occur at the early, middle or late stages of the explosion), it is considered that the explosion is still uncontrollable under the coordination of passive and active pressure relief. The vacuum induction melting furnace vacuum pumping system is no longer allowed to gradually increase the vacuum speed, nor is the pressure relief device allowed to hinder the exhaust. Therefore, the vacuum induction melting furnace vacuum pumping system immediately works at the extreme value, and the pressure relief device counterweight is reduced to avoid furnace explosion.

[0064] Through the linkage of passive pressure relief and active pressure reduction, the present invention can significantly improve the working safety of the vacuum induction melting furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] The drawings of the present invention are intended to illustrate the general characteristics of the methods, structures and / or materials used in specific exemplary embodiments of the present invention, and to supplement the description in the specification. However, the drawings of the present invention are schematic diagrams not drawn to scale, and thus may not accurately reflect the precise structure or performance characteristics of any given embodiment, and the drawings of the present invention should not be interpreted as limiting or restricting the range of values ​​or properties covered by the exemplary embodiments of the present invention. The present invention is further described in detail below in conjunction with the drawings and specific embodiments.

[0066] Figure 1 It is a schematic structural diagram of the first embodiment of the present invention.

[0067] Figure 2 It is a partial cross-sectional schematic diagram of the first installation form of the elastic buffer seal of the present invention.

[0068] Figure 3 It is a partial cross-sectional schematic diagram of the second installation form of the elastic buffer seal of the present invention.

[0069] Figure 4 It is a partial cross-sectional schematic diagram of the third installation form of the elastic buffer seal of the present invention.

[0070] Description of reference numerals:

[0071] Subject 1;

[0072] Guide rod 2;

[0073] Guide part 3;

[0074] Carrying sealing platform 4;

[0075] Carrying sealing platform bottom wall 4.1;

[0076] Automatic weight balancing device 5;

[0077] Elastic buffer seal 6;

[0078] Air inlet 7;

[0079] Air inlet top wall 7.1;

[0080] Vacuum induction melting furnace cavity pressure relief port 8;

[0081] Air outlet 9;

[0082] A first accommodating groove 10;

[0083] A second accommodating groove 11;

[0084] Weight liquid chamber 12;

[0085] Gas port 13;

[0086] Weight liquid pipe 14;

[0087] Pump 15;

[0088] Infusion and extraction hole 16. DETAILED DESCRIPTION

[0089] The following is an explanation of the embodiments of the present invention by specific specific embodiments, and those skilled in the art can fully understand other advantages and technical effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through different specific embodiments, and the details in this specification can also be applied based on different viewpoints, and various modifications or changes can be made without deviating from the general design concept of the invention. It should be noted that, in the absence of conflict, the following embodiments and the features in the embodiments can be combined with each other. The following exemplary embodiments of the present invention can be implemented in a variety of different forms and should not be interpreted as being limited to the specific embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of the present invention thorough and complete, and to fully convey the technical solutions of these exemplary specific embodiments to those skilled in the art. It should be understood that when an element is referred to as "connected" or "coupled" to another element, the element can be directly connected or coupled to another element, or there can be an intermediate element. The difference is that when an element is referred to as "directly connected" or "directly coupled" to another element, there is no intermediate element. In all figures, the same reference numerals always represent the same element. As used herein, the term "and / or" includes any combination and all combinations of one or more related listed items.

[0090] First embodiment, reference Figure 1 As shown, the present invention provides an adjustable automatic pressure relief device for a vacuum induction melting furnace, comprising:

[0091] The main body 1 is formed into a hollow structure, and an air inlet 7 is formed at the bottom thereof, the air inlet 7 is sealed and connected to a pressure relief port 8 of the vacuum induction melting furnace cavity, and an air outlet 9 is formed on the side wall thereof;

[0092] The guide rod 2 is formed as a hollow tube passing through the through hole of the top wall of the main body, and its upper part is inserted into the guide part 3. It can move up and down in the through hole of the top wall of the main body and the guide part 3, and its bottom end surface is fixedly connected to the geometric center of the top of the bearing sealing platform 4. It is also used to transport or extract the counterweight liquid; preferably, a plurality of infusion and extraction holes 16 are formed around the side wall of the guide rod 2 at the connection position between the guide rod 2 and the bearing sealing platform 4;

[0093] The guide part 3 is vertically covered and fixed on the through hole on the top wall of the main body;

[0094] A bearing sealing platform 4, whose sealing cover is mounted on the top wall 7.1 of the main body air inlet;

[0095] The automatic weight balancing device 5 is formed above the bearing and sealing platform 4, and can change its own weight according to external instructions to provide the bearing and sealing platform 4 with the gravity required for sealing the air inlet of the main body, including:

[0096] The weight liquid cavity 12 has a top wall formed with an air port 13 for containing the weight liquid;

[0097] The counterweight liquid pipe 14 is formed as a flexible pipe connected to the top of the guide rod 2. The counterweight liquid pipe is formed as a flexible pipe connected to the top of the guide rod 2. The counterweight liquid pipe can move up and down with the guide rod;

[0098] The pump 15 is arranged on the supporting structure beside the adjustable automatic pressure relief device of the vacuum induction melting furnace, and is connected to the balancing liquid pipe 14, and delivers or extracts the balancing liquid to the balancing liquid cavity according to external instructions.

[0099] According to the required vacuum degree and the weight of the sealing platform 4, the volume of the weight liquid to be injected can be calibrated, thereby realizing accurate adjustment of the pressure relief threshold according to the production environment (metal material, size of the furnace body, details of the smelting process, etc.).

[0100] The second embodiment further improves the above-mentioned first embodiment. The same parts are not repeated here, and also includes: an elastic buffer seal 6, which is formed between the bearing sealing platform 4 and the top wall 7.1 of the main body air inlet. It should be noted that, because the present invention has a situation where the bearing sealing platform 4 moves up and down during a pressure relief, there may even be a situation where the bearing sealing platform and the main body air inlet are in contact and separated multiple times. The elastic buffer seal of the present invention has two functions: sealing and buffering. When the bearing sealing platform contacts the main body air inlet, it forms a sealing effect. When the bearing sealing platform falls, the elastic buffer seal plays a buffering role.

[0101] Regarding the arrangement of the elastic buffer seal 6, the following three optional installation forms are provided.

[0102] The first installation form, refer to Figure 2As shown, the first accommodating groove 10 is formed on the main body air inlet top wall 7.1 surrounding the main body air inlet, and its bottom wall is formed as an arc surface;

[0103] The elastic buffer seal 6 is arranged in the first accommodating groove 10 with interference fit, and at least a portion of the elastic buffer seal 6 is exposed from the first accommodating groove 10, the bottom of the cross section of the elastic buffer seal is formed as an arc surface adapted to the bottom wall of the first accommodating groove, and the top surface of the elastic buffer seal is formed as a plane;

[0104] The top of the elastic buffer seal forms surface contact with the bottom wall 4.1 of the bearing seal platform.

[0105] The second installation method, refer to Figure 3 As shown, the first accommodating groove 10 is formed on the bottom wall 4.1 of the bearing sealing platform, the position of the first accommodating groove 10 corresponds to the air inlet around the main body, and the top wall of the first accommodating groove is formed as an arc surface;

[0106] The elastic buffer seal 6 is arranged in the first accommodating groove 10 with interference fit, and at least a portion of the elastic buffer seal 6 is exposed from the first accommodating groove 10, the top of the cross section of the elastic buffer seal is formed as an arc surface adapted to the bottom wall of the first accommodating groove, and the bottom surface of the elastic buffer seal is formed as a plane;

[0107] The bottom surface of the elastic buffer seal 6 forms surface contact with the top wall 7.1 of the main body air inlet.

[0108] The third installation method, refer to Figure 4 As shown, the first accommodating groove 10 is formed on the main body air inlet top wall 7.1 surrounding the main body air inlet, and its bottom wall is formed as an arc surface;

[0109] The second accommodating groove 11 corresponds to the first accommodating groove 10 in shape and position. The second accommodating groove 11 is formed on the counterpart of the first accommodating groove 10. In this embodiment, the second accommodating groove 11 is formed on the bottom wall 4.1 of the bearing sealing platform.

[0110] The elastic buffer seal 6 is interference-arranged in the first accommodating groove 10 and the second accommodating groove 11 , and when the sealing cover of the bearing sealing platform 4 is installed on the main body air inlet, at least part of the elastic buffer seal 6 is exposed from the first accommodating groove 10 and the second accommodating groove 11 .

[0111] In order to quickly evacuate the gas in the vacuum induction melting furnace and realize the dynamic balance between passive pressure relief and active vacuuming, a sensor can be further provided on the basis of the second embodiment, which is arranged between the bottom wall 4.1 of the bearing sealing platform and the top wall 7.1 of the main body air inlet. For example, a contact distance sensor is selected, which is used to detect the distance change between the bottom wall 4.1 of the bearing sealing platform and the top wall 7.1 of the main body air inlet. Once the position change occurs, it means that the pressure relief threshold of the present invention has been reached, and pressure relief begins.

[0112] If the sensor detects that the distance increases, it continuously sends a first trigger signal to the vacuum induction melting furnace vacuum pumping system. The vacuum induction melting furnace vacuum pumping system continuously receives the first trigger signal and gradually increases the vacuuming speed until it reaches its working extreme value.

[0113] If the sensor detects that the distance is reduced, it will continue to send a second trigger signal to the vacuum induction melting furnace vacuum system. The vacuum induction melting furnace vacuum system continues to receive the second trigger signal and gradually reduces the vacuum speed until the normal working requirements of the vacuum induction melting furnace are met.

[0114] And, if the sensor detects that the distance is greater than the first distance threshold, a third trigger signal is sent to the pump and the vacuum induction melting furnace vacuum pumping system. The pump immediately executes maximum power to extract the counterweight liquid upon receiving the third trigger signal, and the vacuum induction melting furnace vacuum pumping system immediately executes maximum power vacuum pumping upon receiving the third trigger signal.

[0115] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present invention belongs. It will also be understood that, unless expressly defined herein, terms such as those defined in general dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and not interpreted in an ideal or overly formal sense.

[0116] The present invention has been described in detail above through specific implementation modes and embodiments, but these do not constitute limitations of the present invention. Without departing from the principles of the present invention, those skilled in the art may also make many variations and improvements, which should also be regarded as the protection scope of the present invention.

Claims

1. An adjustable automatic pressure relief device for a vacuum induction melting furnace, characterized in that: include: The main body (1) is formed into a hollow structure, with an air inlet formed at the bottom thereof, the air inlet being sealed and connected to the pressure relief port (8) of the vacuum induction melting furnace cavity, and an air outlet formed on the side wall thereof; The guide rod (2) is formed as a hollow tube passing through the through hole in the top wall of the main body, the upper part of which is inserted into the guide part (3), and can move up and down in the through hole in the top wall of the main body and in the guide part (3), and the bottom end surface of which is fixedly connected to the geometric center of the top of the bearing sealing platform (4), and is also used to transport or extract the balancing weight liquid; A guide portion (3) which is vertically covered and fixed on the through hole on the top wall of the main body; A bearing sealing platform (4), a sealing cover of which is mounted on the top wall (7.1) of the air inlet of the main body; An automatic weight balancing device (5) is formed above the bearing and sealing platform (4), and can change its own weight according to external instructions to provide the bearing and sealing platform (4) with the gravity required for sealing the air inlet of the main body, comprising: A weight liquid cavity (12), the top wall of which is formed with an air port for accommodating the weight liquid; A counterweight liquid pipe (14), which is formed as a flexible pipeline connected to the top end of the guide rod (2) and communicates with the counterweight liquid cavity (12) through the guide rod (2); A pump (15) is arranged on a supporting structure beside the adjustable automatic pressure relief device of the vacuum induction melting furnace, connected to the balancing liquid pipe (14), and conveys or extracts the balancing liquid to or from the balancing liquid cavity (12) according to external instructions; A sensor, arranged between the bottom wall (4.1) of the bearing sealing platform and the top wall (7.1) of the main body air inlet, and used to detect a change in the distance between the bottom wall (4.1) of the bearing sealing platform and the top wall (7.1) of the main body air inlet; If the sensor detects that the distance increases, it continuously sends a first trigger signal to the vacuum induction melting furnace vacuum pumping system. The vacuum induction melting furnace vacuum pumping system continuously receives the first trigger signal and gradually increases the vacuuming speed until it reaches its working extreme value. If it detects that the distance is reduced, it continuously sends a second trigger signal to the vacuum induction melting furnace vacuum pumping system. The vacuum induction melting furnace vacuum pumping system continuously receives the second trigger signal and gradually reduces the pumping speed until the normal working requirements of the vacuum induction melting furnace are met. If the sensor detects that the distance is greater than the first distance threshold, a third trigger signal is sent to the pump and the vacuum induction melting furnace vacuum pumping system. The pump immediately executes maximum power to extract the counterweight liquid upon receiving the third trigger signal, and the vacuum induction melting furnace vacuum pumping system immediately executes maximum power vacuum pumping upon receiving the third trigger signal.

2. The adjustable automatic pressure relief device for a vacuum induction melting furnace according to claim 1, characterized in that: Also includes: An elastic buffer seal (6) is formed between the bearing seal platform (4) and the top wall (7.1) of the main body air inlet.

3. The adjustable automatic pressure relief device for a vacuum induction melting furnace according to claim 2, characterized in that: Also includes: A first accommodating groove (10) is formed around the main body air inlet on the main body air inlet top wall (7.1), and its bottom wall is formed into an arc surface; The elastic buffer seal (6) is interference-arranged in the first accommodating groove (10), and at least a portion of the elastic buffer seal (6) is exposed from the first accommodating groove (10), the bottom of the cross section is formed as an arc surface adapted to the bottom wall of the first accommodating groove, and the top surface is formed as a plane; The top of the elastic buffer seal (6) forms surface contact with the bottom wall (4.1) of the bearing seal platform.

4. The adjustable automatic pressure relief device for a vacuum induction melting furnace according to claim 2, characterized in that: Also includes: A first accommodating groove (10) is formed on the bottom wall (4.1) of the bearing sealing platform, its position corresponds to surrounding the air inlet of the main body, and its top wall is formed into an arc surface; The elastic buffer seal (6) is arranged in an interference fit in the first accommodating groove (10), and at least a portion of the elastic buffer seal (6) is exposed from the first accommodating groove (10), the top of the cross section is formed as an arc surface adapted to the bottom wall of the first accommodating groove, and the bottom surface is formed as a plane; The bottom surface of the elastic buffer seal (6) forms surface contact with the top wall (7.1) of the main body air inlet.

5. The adjustable automatic pressure relief device for a vacuum induction melting furnace according to claim 3 or 4, characterized in that: Also includes: A second accommodating groove (11) having a shape and position corresponding to the first accommodating groove (10), and formed on the counterpart on which the first accommodating groove (10) is arranged; The elastic buffer seal (6) is arranged in an interference fit in the first accommodating groove (10) or the second accommodating groove (11), and when the sealing cover of the bearing sealing platform (4) is mounted on the air inlet of the main body, at least part of the elastic buffer seal (6) is exposed in the first accommodating groove (10) and the second accommodating groove (11).

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