Locking device of steam furnace

Abstract

The invention discloses a locking device of a steam boiler, which relates to the field of boilers and is characterized by comprising a boiler furnace, a boiler cover, a lifting mechanism and a locking mechanism. And the furnace pipe and the furnace cover are respectively provided with support lugs extending along the radial direction, are in contact fit in the axial direction, and are provided with sealing pieces. The locking mechanism comprises a rotatable locking ring arranged around the first support lug, a locking block arranged on the inner wall of the locking ring, a wedge block and a notch which are arranged on the outer edge of the furnace cover, and a second linear driving device for driving the locking ring to rotate. The locking block and the wedge-shaped block generate axial pressing force when the locking ring rotates, and therefore effective sealing of the furnace cover is achieved. Through cooperation of the locking ring and the wedge-shaped structure, radial motion is converted into axial pressing force, sealing reliability in the high-temperature environment is ensured, and the sealing device has the advantages of being compact in structure, efficient in locking and stable in sealing.

Description

Technical Field

[0001] The present invention relates to the field of boilers, and in particular to a locking device for a steam boiler. Background Art

[0002] High-temperature, enclosed equipment such as steam furnaces and heat treatment furnaces is widely used in industries such as powder metallurgy and automotive parts processing. The furnace cover of such equipment is typically opened and closed by a lifting mechanism, allowing the heating chamber to be resealed after workpiece loading and unloading. Hydraulic lifting mechanisms are widely used due to their high output force and smooth operation. They are used to vertically lift the heavy furnace cover and complete flange docking and sealing.

[0003] However, in actual use, traditional hydraulic lifting structures commonly suffer from insufficient furnace cover docking precision. Specifically, when the furnace cover descends and approaches the flange, due to the limited control accuracy of the hydraulic cylinder, deformation of the furnace structure, and the lack of clamps or flange guides, the furnace cover often has difficulty achieving precise concentric docking with the furnace flange, and is prone to deflection, misalignment, or end face non-parallelism. This misalignment not only leads to uneven flange contact, affecting the compression of the sealing gasket and increasing the risk of leakage, but can also cause localized wear or jamming of the furnace cover and clamp components, affecting the long-term stable operation of the equipment. Summary of the Invention

[0004] The present invention aims to provide a locking device for steam furnaces that achieves efficient alignment, reliable locking, and stable sealing between the furnace cover and furnace under high-temperature and high-pressure conditions. It features a compact structure, a high degree of automated operation, strong sealing reliability, excellent resistance to high-temperature thermal deformation, and a long service life. This device is particularly suitable for industrial applications such as powder metallurgy and automotive parts, where strict sealing and safety requirements are placed on steam handling processes. It can effectively improve the operational safety and ease of maintenance of steam furnace systems.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions: A locking device for a steam oven, comprising: A furnace core is provided with a first lug extending radially outward; A furnace cover, wherein the furnace cover is provided with a second lug extending radially outward; the first lug and the second lug form a surface contact fit in the axial direction, and a sealing member is provided therebetween; A lifting mechanism drives the furnace cover to move back and forth relative to the furnace axial direction; Locking mechanism, including: The locking ring is arranged around the outer circumference of the first ear and can rotate around its own axis; A locking block, fixed to the inner wall of the locking ring; The wedge-shaped blocks and the notches are correspondingly arranged on the outer edge of the circumferential direction of the furnace cover; a second linear drive device, driving the locking ring to perform circumferential rotation; Wherein, the locking block has: First state: when the locking ring rotates to the unlocking position, the locking block and the wedge block are coaxially connected, so that the lifting mechanism can drive the furnace cover to rise and fall in the first state; Second state: when the locking ring rotates to the locking position, the locking block is inserted into the notch and then rotates circumferentially and abuts against the inclined surface of the wedge block to generate an axial force component to compress the seal.

[0006] It is further configured that: a convex ring and a rolling element are axially provided on the inner wall of the locking ring, the convex ring is located at one axial end of the locking ring; the rolling element is distributed at the other axial end of the locking ring, a plurality of rolling elements are provided and arranged along the circumference of the locking ring, and the plurality of rolling elements are arranged parallel to the convex ring; The axial distance between the convex ring and the rolling element is adapted to the thickness of the first lug, so that the first lug forms an axial limiting fit between the convex ring and the rolling element.

[0007] Further configuration: a connecting seat is provided at the front end of the second linear drive device, the connecting seat is fixedly connected to the locking ring, a base is provided at the rear end of the second linear drive device, the base is installed on an external fixed foundation, and the front and rear ends of the second linear drive device are respectively hingedly connected to the connecting seat and the base.

[0008] Further configuration: the second linear drive device is integrated with a torque control system, comprising: Startup control module: configured to output an over-rated torque pulse at the moment the locking ring rotates and starts, the torque value of the pulse is 250%-300% of the rated torque, and the duration is 0.08-0.12 seconds; Constant speed control module: configured to maintain a constant speed after the locking ring starts rotating, with the speed range controlled at 6-10 rpm, until the locking ring rotates to 2° before the target angle; Flexible positioning module: configured to linearly reduce the output torque from the rated torque value to 80% of the rated torque value within the last 2° of rotation before the locking ring reaches the target angle.

[0009] Further configuration: the lifting mechanism includes: Fixed seat, rigidly mounted on an external fixed foundation; A first linear drive device is vertically fixed on the fixing base; A lifting rod, coaxially connected to the output end of the first linear drive device and driven thereby to perform vertical lifting; The lifting frame is fixedly connected to the top of the lifting rod and moves synchronously with it; wherein, the lifting frame is linked with the furnace cover to convert the linear motion of the lifting rod into the axial reciprocating motion of the furnace cover.

[0010] Further configuration: it also includes a lifting slide installed on an external fixed foundation, the lifting slide is located on the lifting path of the lifting rod, and the lifting rod is inserted into the lifting slide.

[0011] Further configuration: the lifting slide is provided with: A guide bushing, which forms a radial floating gap with the lifting rod; Array disc spring group, distributed along the circumference on the inner wall of the lifting slide; Annular array temperature sensor: distributed along the circumference on the inner wall of the lifting slide; The floating gap control module controls the preload force of the array disc spring group according to the signal fed back by the temperature sensor, and dynamically adjusts the compression of the array disc spring group to compensate for thermal deformation.

[0012] It is further configured that the sealing member is a graphite wound gasket, a metal corrugated gasket or a high-temperature flexible composite sealing ring, and is arranged on the fitting surface between the first support ear and the second support ear.

[0013] It is further configured that a capillary cooling network is provided inside the wedge block, and the capillary cooling network is connected to an external circulating coolant source.

[0014] Further configuration: the surface of the wedge block is covered with a multi-layer composite wear-resistant layer, which includes from the inside to the outside: Tungsten carbide layer, thickness 0.3mm, average grain size ≤5μm; Diamond layer, thickness 10μm, friction coefficient ≤ 0.10; Micron-scale graphene self-lubricating coating, 5μm thickness.

[0015] In summary, the present invention has the following beneficial effects: First, the present invention utilizes an innovative design that integrates the locking block with the wedge block and slot. Once the furnace cover is lowered into place, a second linear drive mechanism drives the locking ring to rotate circumferentially. During this process, the locking block precisely fits into the slot on the furnace cover and further rotates circumferentially to abut against the inclined surface of the wedge block. This directly converts the locking ring's circumferential rotational kinetic energy into vertical axial pressure. Unlike traditional radial contraction, the locking ring's circumferential rotational motion eliminates radial contraction, thus preventing jamming caused by differential thermal expansion. The inclined surface abutment mechanism allows for micro-slip compensation, achieving a degree of adaptive thermal deformation compensation.

[0016] Furthermore, this design makes the locking process not just a simple radial tightening, but also an active correction of the misalignment between the furnace cover and the furnace core. When the locking block abuts the inclined surface of the wedge block, the axial force it generates is not only used to compress the seal, but more importantly, this force guides the furnace cover to automatically adjust its position, achieving precise concentric alignment with the core shaft of the furnace core. At the same time, because the locking block rotates and abuts circumferentially only after being inserted into the notch, the circumferential rotation of the locking ring and the locking block and wedge block cleverly integrate the locking process with the alignment correction function, achieving the effect of locking and centering. This avoids the possible jamming and wear that may result from the direct application of radial force when traditional clamps are not fully aligned.

[0017] Furthermore, the locking ring is a monolithic structure, enabling more uniform circumferential force distribution. When the second linear drive mechanism drives its circumferential rotation, the locking blocks on the inner wall of the locking ring simultaneously and evenly contact the multiple wedge-shaped block slopes around the furnace roof. This synchronized and distributed action ensures that the axial force component generated by the circumferential rotation is evenly transmitted across the entire circumference of the seal.

[0018] Second, in this invention, a convex ring and rolling elements are axially arranged on the inner wall of the locking ring, forming an axial elastic constraint system. The radial floating capacity of the rolling elements absorbs differential thermal expansion of the furnace cover. The rolling elements independently displace and compensate for localized deformation. Furthermore, the rolling elements convert sliding friction (μ = 0.15-0.3) into rolling friction (μ ≤ 0.03), reducing rotational friction and significantly reducing the rotational driving force. The array of rollers and the convex rings create a circumferential force balance, offsetting the eccentric torque of the locking ring and preventing the eccentric wear of traditional sliding structures.

[0019] Third, the present invention further proposes an integrated torque control system for the second linear drive, which addresses the dual challenges of high initial inertial resistance and poor end-positioning accuracy of the locking ring. The system integrates a three-stage dynamic torque control module. This module addresses the two major issues of conventional locking structures: high static friction and moment of inertia leading to slippage or sticking during initial startup, and the tendency to overshoot the positioning angle at the end. These include pulsed over-torque startup and flexible end-positioning torque reduction strategies. The startup control module outputs a super-rated torque pulse (250%-300% of the rated torque, lasting 0.08-0.12 seconds) at the moment the locking ring starts rotating. This short, high-torque pulse provides a powerful instantaneous driving force, effectively overcoming starting inertia, static friction, and any minor sticking. This acts as a powerful "booster" for the system, ensuring that the locking ring quickly and reliably breaks free from a static state and precisely begins its circumferential rotation, laying a solid foundation for subsequent alignment and locking operations. The constant speed control module maintains the locking ring's rotational speed within a constant range of 6-10 rpm after startup. This constant speed ensures that the locking block engages the notch and the wedge block slope at a stable and predictable speed, making the axial clamping force generation process smoother and more uniform. The end-of-line flexible positioning module automatically reduces the output torque to 80% 2° before the target angle, avoiding inertial shock and over-rotation, thereby achieving high-precision endpoint control.

[0020] Fourth, the present invention further proposes a lifting mechanism and its supporting thermal compensation guide structure to solve the problems of guide misalignment and jamming caused by thermal expansion of the lifting mechanism under high-temperature working conditions, thereby achieving high-precision lifting guidance. The present invention sets a guide bushing and an array of disc springs inside the lifting slide, which allows a controllable floating gap in the radial direction while ensuring that the lifting rod has sufficient guiding support force. This floating structure not only avoids the problems of jamming and shaft sticking caused by temperature rise in traditional rigid guide structures, but also absorbs the thermal expansion deformation caused by heat conduction from the furnace cover to the lifting rod, thereby achieving thermally adaptive guiding support.

[0021] Multi-point temperature sensing and dynamic force control are introduced to achieve adaptive adjustment of guide stiffness. A circular array of temperature sensors is placed on the inner wall of the slide, enabling real-time monitoring of temperature changes in different circumferential regions of the lift rod, providing real-time input signals for thermal deformation. Linked to the floating gap control module, the preload and compression of the arrayed disc spring assembly are adjusted based on the monitored temperature signals, enabling dynamic adjustment of the lift guide force. This solution establishes a control path between ambient temperature, guide stiffness, and lift accuracy through a closed-loop feedback control system, demonstrating strong adaptability and engineering suitability.

[0022] Distributed control of the disc spring assembly provides flexible limiting and vibration isolation, enhancing system stability and impact resistance. Compared to traditional single-point rigid limiting, this solution utilizes a disc spring array structure evenly distributed along the inner wall of the slide. This not only creates a uniformly distributed flexible support force field, but also, due to the disc spring's inherent energy absorption and rebound properties, provides cushioning and fine-tuning during lifting shock or sealing extrusion, improving the overall operational smoothness of the device and preventing "bouncing" or "eccentric wear" of the lifting rod caused by transient thermal shock or force fluctuations. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural diagram of the locking device of the steam boiler; Figure 2 yes Figure 1 A magnified view of point A; Figure 3 It is a structural diagram of the furnace cover; Figure 4 1. It is a schematic diagram of the three-dimensional structure of the locking mechanism; Figure 5 is a schematic diagram of the cross-sectional structure of the locking mechanism; Figure 6 It is a top view of the lifting mechanism; Figure 7 It is a schematic diagram of the lifting mechanism; Figure 8 It is a structural diagram of a wedge block.

[0024] In the figure, 100 is a furnace shell; 101 is a first inner cavity; 200, furnace core; 201, first lug; 202, seal; 300, furnace cover; 301, second lug; 302, notch; 303, wedge; 304, tungsten carbide layer; 305, diamond layer; 306, micron-scale graphene self-lubricating coating; 307, capillary cooling network; 400, lifting mechanism; 401, lifting rod; 402, lifting frame; 403, lifting slide; 404, fixed seat; 405, first linear drive device; 500, locking mechanism; 501, locking ring; 502, locking block; 503, connecting seat; 504, second linear drive device; 505, base; 507, rolling element; 508, convex ring. DETAILED DESCRIPTION

[0025] The present invention will be further described in detail below with reference to the accompanying drawings.

[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0027] A locking device for a steam oven, such as Figure 1 and Figure 2 As shown, the furnace shell 100 includes a furnace core 200, a furnace cover 300, a lifting mechanism 400 and a locking mechanism 500. The furnace shell 100 has a first inner cavity 101, and the furnace core 200 is installed on the top of the furnace shell 100 and is located in the first inner cavity 101 as a whole.

[0028] The upper end of the furnace 200 is provided with a first lug 201 extending radially outward, while the lower end of the furnace cover 300 is provided with a second lug 301 extending radially outward. The first lug 201 and the second lug 301 form a surface-to-surface fit in the axial direction, with a seal 202 disposed therebetween to achieve a sealed seal when the furnace cover 300 is pressed against the furnace 200.

[0029] The lifting mechanism 400 is used to drive the furnace cover 300 to reciprocate in the axial direction relative to the furnace 200 to realize the opening and closing of the furnace cover 300 .

[0030] like Figure 3-Figure 5 As shown, the locking mechanism 500 includes a locking ring 501, a locking block 502, a wedge block 303, a notch 302, and a second linear drive device 504. The locking ring 501 is disposed around the outside of the circumference of the first lug 201 and is rotatable circumferentially about its own axis. The locking block 502 is fixed to the inner wall of the locking ring 501 and protrudes radially inward. The wedge block 303 and notch 302 are disposed at the circumferential outer edge of the furnace cover 300. The notch 302 is used to accommodate the locking block 502. The outer surface of the wedge block 303 is a beveled structure that provides a force-bearing inclined surface for locking engagement.

[0031] The second linear drive device 504 is used to drive the locking ring 501 to rotate in the circumferential direction, thereby driving the locking block 502 to achieve position switching.

[0032] In actual use, the locking block 502 can be switched between the following two states: First state: When the locking ring 501 rotates to the unlocked position, the locking block 502 and the wedge block 303 remain coaxially connected, and the locking block 502 is disengaged from the notch 302, so that the lifting mechanism 400 can drive the furnace cover 300 to move up and down in the axial direction to achieve opening and closing operations; Second state: When the locking ring 501 rotates to the locking position, the locking block 502 is embedded in the notch 302 and rotates circumferentially with the locking ring 501. Its end abuts against the inclined surface of the wedge block 303. Due to the existence of the inclined surface structure, an axial force component is generated during the contact process, pressing the second ear 301 toward the first ear 201, thereby squeezing the seal 202 to form an effective seal.

[0033] Through the above structural design, the furnace cover 300 can automatically enter the locking state after completing the lifting action, and generate axial compression force through the wedge structure during the locking process, ensuring the sealing reliability of the steam furnace in a high temperature and high pressure environment.

[0034] like Figure 4-Figure 5 As shown, the inner wall of the locking ring 501 is provided with a limiting structure along its axial direction for limiting the axial displacement of the lugs of the furnace 200. The limiting structure includes a convex ring 508 provided at one axial end of the locking ring 501 and a plurality of rolling elements 507 distributed at the other opposite end.

[0035] Specifically, the convex ring 508 is preferably an annular protrusion structure, fixedly formed on the inner wall of one end of the locking ring 501; the rolling elements 507 are evenly spaced along the circumferential direction of the locking ring 501, and are set on the inner wall of the axial end opposite to the convex ring 508. Multiple rolling elements 507 are arranged parallel to the convex ring 508 to form a pair of oppositely arranged axial positioning surfaces.

[0036] When the locking ring 501 is installed in place, the first lug 201 is inserted between the convex ring 508 and the rolling element 507, and the axial spacing between the convex ring 508 and the rolling element 507 is adapted to the axial thickness of the first lug 201, so that the first lug 201 is clamped and limited between the convex ring 508 and the rolling element 507, forming a stable support and positioning matching relationship in the axial direction.

[0037] This structure can effectively limit the axial movement or deviation of the first lug 201 during the process of rotational locking or unlocking of the locking ring 501, thereby improving the structural stability and operational reliability of the locking system.

[0038] The second linear actuator 504 is used to drive the locking ring 501 in circumferential rotation about its axis. Its front end is equipped with a connecting seat 503, which is fixedly connected to the outer peripheral sidewall of the locking ring 501 to achieve power transmission. The rear end of the second linear actuator 504 is equipped with a base 505, which is mounted on a fixed foundation outside the steam boiler to provide stable support. To accommodate angular changes in the locking ring 501 during rotation and avoid stress concentration caused by installation errors, the front and rear ends of the second linear actuator 504 are connected to the connecting seat 503 and base 505 respectively through hinged joints, forming a flexible linkage structure, improving the stability and adaptability of the device's operation.

[0039] Furthermore, to ensure that the locking ring 501 has good dynamic response and control accuracy under multiple working conditions such as rotation start-up, uniform speed operation, and precise positioning, a torque control system is integrated into the second linear drive device 504. The torque control system includes the following modules: First, the startup control module is configured to output a short torque pulse exceeding the rated value at the moment the locking ring 501 starts rotating, to overcome initial static friction and system inertia. This torque pulse output is 250% to 300% of the rated torque, with a pulse duration controlled between 0.08 and 0.12 seconds to achieve a quick startup without overshoot.

[0040] Secondly, the uniform speed control module is used to control the locking ring 501 to rotate at a constant speed after it leaves the static state. The preferred speed range is 6 to 10 revolutions per minute, ensuring that the locking block 502 remains stable during the circumferential movement to prevent misalignment or interference due to speed fluctuations.

[0041] Finally, the flexible positioning module is configured to linearly reduce the output torque within the last 2° rotation stroke before the locking ring 501 approaches the target locking angle, so that it gradually decreases from the rated torque to 80% of the rated value, so as to achieve a flexible transition and precise stop at the end of the locking process, thereby reducing the locking impact and improving the service life of the sealing gasket.

[0042] Through the coordinated control of the above-mentioned integrated torque control system, the response efficiency, control accuracy and operating smoothness of the locking ring 501 under different working conditions can be effectively improved, ensuring that the entire locking process is safe, reliable and efficient.

[0043] like Figure 6-Figure 7 As shown, the lifting mechanism 400 is used to drive the furnace cover 300 to achieve lifting movement relative to the furnace 200 in the vertical direction. Its structure includes a fixed seat 404, a first linear drive device 405, a lifting rod 401, a lifting frame 402 and a lifting slide 403.

[0044] The fixed base 404 is rigidly mounted on the steam oven's external fixed foundation, serving as the supporting platform for the entire lifting structure. A first linear actuator 405 is vertically mounted on the fixed base 404, with its output end coaxially connected to the lifting rod 401. This actuator drives the lifting rod 401 up and down in a vertical direction, thereby opening and closing the furnace cover 300.

[0045] The top of the lifting rod 401 is fixedly connected to a lifting frame 402, which rises and falls synchronously with the lifting rod 401 and forms a linkage structure with the furnace cover 300. That is, the linear displacement of the lifting rod 401 is converted into an axial reciprocating motion of the furnace cover 300 through mechanical connection or guide connection, thereby realizing the opening and closing coordination between the furnace cover 300 and the furnace core 200.

[0046] To enhance the guiding accuracy and structural stability of the lifting motion, a lifting slide 403 is further provided on the external fixed base. The lifting slide 403 is located on the lifting path of the lifting rod 401 and has a guide hole inside it. The lifting rod 401 passes through the guide hole, providing good radial support and guiding constraints for the lifting rod 401 during its up and down movement, preventing deflection or shaking during the lifting process, thereby improving the centering accuracy and operational stability of the furnace cover 300's lifting motion.

[0047] The lifting slide 403 is used to provide guidance and support for the vertical lifting movement of the lifting rod 401. A thermal compensation and floating guide composite structure is set inside it to improve the lifting accuracy and adapt to thermal expansion changes in high temperature environments.

[0048] Specifically, a guide bushing is provided in the inner cavity of the lifting slide 403, and the guide bushing is sleeved on the outer circular surface of the lifting rod 401, and a radial floating gap is formed between the two, thereby allowing the lifting rod 401 to produce a slight floating in the radial direction while maintaining basic guiding accuracy, so as to buffer the dimensional changes caused by thermal expansion.

[0049] In order to achieve dynamic control of the floating gap, an array of disc spring groups is evenly installed along the circumferential direction on the inner wall of the lifting slide 403. The disc spring group is arranged around the guide bushing and can provide an adaptive elastic preload in the radial direction to compensate for changes in the fitting clearance caused by temperature changes.

[0050] Furthermore, the lifting slide 403 is also provided with a plurality of annular array temperature sensors along the circumferential direction on the inner wall thereof, for collecting temperature change data of the lifting rod 401 and its surrounding environment in real time, and transmitting the collected data to the floating gap control module.

[0051] The floating gap control module adjusts the compression state of the array disc spring group in real time based on the feedback signal of the temperature sensor, that is, by adjusting the preload force of the disc spring group to dynamically adjust the floating gap between the guide bushing and the lifting rod 401, thereby achieving effective compensation for the dimensional deviation caused by thermal deformation, and ensuring that the lifting structure can maintain good guiding accuracy and motion stability under different temperature conditions.

[0052] like Figure 1-Figure 2 As shown, seal 202 is disposed between the axially mating surfaces of first lug 201 and second lug 301, within the contact area between the two, to provide a sealing function. Seal 202 can be made from a variety of high-performance materials, preferably including graphite spiral wound gaskets, metal corrugated gaskets, or high-temperature flexible composite sealing rings. These sealing materials exhibit excellent high-temperature resistance, corrosion resistance, and elastic deformation properties, effectively preventing medium leakage in the steam furnace operating environment and ensuring airtightness and sealing reliability between the furnace cover 300 and the furnace 200. Through its excellent elasticity and compressibility, seal 202 adapts to minor deformations between the first lug 201 and the second lug 301 caused by temperature changes and mechanical loads, further enhancing the overall sealing effect and service life.

[0053] like Figure 3 As shown, wedge block 303 is internally equipped with a capillary cooling network 307, arranged along the interior space of wedge block 303 to form dense and evenly distributed cooling channels. Capillary cooling network 307 is connected to an external circulating coolant source via a pipe interface, enabling continuous introduction of coolant for circulated cooling. This structure effectively reduces the operating temperature of wedge block 303, preventing thermal expansion and performance degradation caused by high temperatures, and ensuring stable operation of locking mechanism 500 and long-term reliability of the sealing performance.

[0054] like Figure 8 As shown, the outer surface of the wedge block 303 is covered with a multi-layer composite wear-resistant layer, which includes, from the inside to the outside, a tungsten carbide layer 304, a diamond layer 305 and a micron-scale graphene self-lubricating coating 306.

[0055] First, the tungsten carbide layer 304 formed by plasma spraying has a thickness of approximately 0.3 mm and an average grain size controlled below 5 microns to ensure that the layer has excellent hardness and wear resistance; It is covered with a diamond layer 305 with a thickness of about 10 microns, which has an extremely low friction coefficient, preferably not greater than 0.10, thereby significantly reducing the friction resistance between the contact surfaces; The outermost layer is a micron-scale graphene self-lubricating coating 306 with a thickness of about 5 microns. This coating has a good lubricating effect, can further reduce friction and wear, and improve the durability and service life of the surface of the wedge block 303.

[0056] Through the design of this multi-layer composite wear-resistant structure, the wedge block 303 obtains excellent wear resistance and self-lubricating properties at the moving contact part in the locking mechanism 500, effectively extending the service life of the component and improving the overall reliability and stability of the locking device.

[0057] In the above embodiment, the first linear drive device 405 and the second linear drive device 504 are both hydraulic cylinders.

[0058] The above embodiments are merely explanations of the present invention and are not limitations of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the embodiments as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A locking device for a steam oven, characterized in that: include: A furnace core (200) is provided with a first lug (201) extending radially outward; A furnace cover (300), wherein the furnace cover (300) is provided with a second lug (301) extending radially outward; the first lug (201) and the second lug (301) form a surface contact fit in the axial direction, and a sealing member (202) is provided between the two; A lifting mechanism (400) drives the furnace cover (300) to move back and forth axially relative to the furnace (200); The locking mechanism (500) comprises: A locking ring (501) is arranged around the outer circumference of the first lug (201) and can rotate around its own axis; A locking block (502) is fixed to the inner wall of the locking ring (501); The wedge-shaped block (303) and the notch (302) are correspondingly arranged on the outer edge of the furnace cover (300) in the circumferential direction; a second linear drive device (504) for driving the locking ring (501) to perform circumferential rotation; Wherein, the locking block (502) has: First state: when the locking ring (501) rotates to the unlocking position, the locking block (502) and the wedge block (303) are coaxially connected, so that the lifting mechanism (400) can drive the furnace cover (300) to rise and fall in the first state; Second state: when the locking ring (501) rotates to the locking position, the locking block (502) is inserted into the notch (302) and then rotates circumferentially and abuts against the inclined surface of the wedge block (303) to generate an axial force component to compress the sealing element (202).

2. The locking device of a steam oven according to claim 1, characterized in that: The inner wall of the locking ring (501) is provided with a convex ring (508) and a rolling element (507) along the axial direction, wherein the convex ring (508) is located at one axial end of the locking ring (501); the rolling element (507) is distributed at the other axial end of the locking ring (501), and a plurality of rolling elements (507) are provided and arranged along the circumference of the locking ring (501), and the plurality of rolling elements (507) are arranged in parallel with the convex ring (508); The axial spacing between the convex ring (508) and the rolling element (507) is adapted to the thickness of the first lug (201), so that the first lug (201) forms an axial limiting fit between the convex ring (508) and the rolling element (507).

3. The locking device of a steam oven according to claim 2, characterized in that: The front end of the second linear drive device (504) is provided with a connecting seat (503), and the connecting seat (503) is fixedly connected to the locking ring (501). The rear end of the second linear drive device (504) is provided with a base (505), and the base (505) is installed on an external fixed foundation. The front and rear ends of the second linear drive device (504) are respectively hingedly connected to the connecting seat (503) and the base (505).

4. The locking device of a steam oven according to claim 3, characterized in that: The second linear drive device (504) is integrated with a torque control system, comprising: A starting control module is configured to output an over-rated torque pulse at the moment when the locking ring (501) is rotated and started, wherein the torque value of the pulse is 250%-300% of the rated torque and the duration is 0.08-0.12 seconds; A constant speed control module is configured to maintain a constant speed after the locking ring (501) starts rotating, with the speed range controlled within 6-10 rpm, until the locking ring (501) rotates to 2° before the target angle; The flexible positioning module is configured to linearly reduce the output torque from the rated torque value to 80% of the rated torque value within the last 2° of rotational travel before the locking ring (501) reaches the target angle.

5. The locking device of a steam oven according to claim 1, characterized in that: The lifting mechanism (400) comprises: A fixed seat (404) is rigidly mounted on an external fixed foundation; A first linear drive device (405) is vertically fixed on the fixing seat (404); A lifting rod (401) is coaxially connected to the output end of the first linear drive device (405) and is driven thereby to perform vertical lifting; The lifting frame (402) is fixedly connected to the top of the lifting rod (401) and moves synchronously therewith; wherein the lifting frame (402) is arranged in linkage with the furnace cover (300) to convert the linear motion of the lifting rod (401) into the axial reciprocating motion of the furnace cover (300).

6. The locking device of a steam oven according to claim 5, characterized in that: It also includes a lifting slide (403) installed on an external fixed foundation, the lifting slide (403) is located on the lifting path of the lifting rod (401), and the lifting rod (401) is inserted into the lifting slide (403).

7. The locking device of a steam oven according to claim 6, characterized in that: The lifting slide (403) is provided with: A guide bushing, which forms a radial floating gap with the lifting rod (401); An array of disc springs is distributed along the circumference of the inner wall of the lifting slide (403); Annular array temperature sensors: distributed along the circumference on the inner wall of the lifting slide (403); The floating gap control module controls the preload force of the array disc spring group according to the signal fed back by the temperature sensor, and dynamically adjusts the compression of the array disc spring group to compensate for thermal deformation.

8. A locking device for a steam oven according to any one of claims 1 to 7, characterized in that: The sealing member (202) is a graphite wound gasket, a metal corrugated gasket or a high-temperature flexible composite sealing ring, and is arranged on the fitting surface between the first lug (201) and the second lug (301).

9. A locking device for a steam oven according to any one of claims 1 to 7, characterized in that: A capillary cooling pipe network (307) is provided inside the wedge-shaped block (303), and the capillary cooling pipe network (307) is connected to an external circulating cooling liquid source.

10. A locking device for a steam oven according to any one of claims 1 to 7, characterized in that: The surface of the wedge block (303) is covered with a multi-layer composite wear-resistant layer, which comprises from the inside to the outside: Tungsten carbide layer (304), thickness 0.3 mm, average grain size ≤ 5 μm; Diamond layer (305), thickness 10 μm, friction coefficient ≤ 0.10; A micron-scale graphene self-lubricating coating (306) with a thickness of 5 μm.

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