Well type nitriding furnace for processing special-shaped tube of bicycle

Abstract

The present disclosure relates to the technical field of bicycle processing, and one embodiment of the present disclosure provides a well type nitriding furnace for bicycle special-shaped pipe processing, which comprises a furnace body, an outer ring frame and a top frame, the outer ring frame is arranged outside the furnace body, the top frame is fixed on the upper surface of the outer ring frame, a sealing cover is vertically movably connected on the furnace body, a lifting assembly is arranged on the top frame and the sealing cover, a sealing and pressing assembly is arranged on the outer ring frame, the lifting assembly comprises a plurality of medium access pipes, the medium access pipes are all installed on the sealing cover, an exhaust pipe is arranged on the sealing cover, a pay-off disc driven to rotate by electricity is arranged in a transmission port, and a steel cable is arranged on the pay-off disc. Through the above technical scheme, the technical problem that the existing feeding and discharging relies on a simple lifting hook or manual lifting, the posture of the special-shaped pipe needs to be repeatedly adjusted during hoisting to adapt to the furnace opening, the center of gravity is easy to deviate to knock the furnace wall or cause the pipe body to be deformed, and the pipes need to be fed and discharged one by one during batch processing, and the time consumption of single operation is long is solved.

Description

Technical Field

[0001] The embodiments disclosed herein relate to the technical field of bicycle processing, and more specifically, to a pit-type nitriding furnace for processing bicycle shaped tubes. Background Technology

[0002] As core structural components of bicycle frames and forks, the surface hardness and wear resistance of shaped bicycle tubes directly determine the overall load-bearing safety of the bicycle. Pit-type nitriding furnaces, due to their advantages of uniform internal temperature and stable nitrided layer quality, have become key equipment for surface strengthening treatment of shaped tubes. However, current general-purpose pit-type nitriding furnaces lack specific designs for bicycle shaped tubes, and the drawbacks in the feeding and discharging processes are becoming increasingly prominent, becoming a core bottleneck restricting production efficiency.

[0003] Traditional pit-type nitriding furnaces have a vertical structure with the furnace opening facing upwards and a relatively deep furnace body. The irregularly shaped tubes are curved and vary greatly in length. Currently, feeding and unloading rely on simple hooks or manual lifting. During hoisting, the posture of the irregularly shaped tubes needs to be repeatedly adjusted to fit the furnace opening. This can easily cause the tubes to collide with the furnace wall or deform due to a shift in the center of gravity. When processing in batches, each tube needs to be fed and unloaded individually, which takes a long time per operation. The equipment is in a waiting state for a long time, resulting in low effective operating efficiency. Furthermore, the furnace opening sealing cover lacks a coordinated design with the hoisting action. The opening and closing process can easily disrupt the stability of the nitriding atmosphere inside the furnace, indirectly affecting the processing quality.

[0004] These issues contradict the demands for large-scale, high-precision production of bicycle shaped tubes. Therefore, developing a pit-type nitriding furnace for processing bicycle shaped tubes to solve the problem of inconvenient material feeding and unloading has become an urgent need for the industry. Utility Model Content

[0005] To overcome the above-mentioned defects, the embodiments of this disclosure provide a pit-type nitriding furnace for processing bicycle shaped tubes, which solves the technical problems of existing materials feeding and discharging relying on simple hooks or manual lifting, requiring repeated adjustment of the shaped tube posture to fit the furnace opening during hoisting, easily causing the center of gravity to shift and hit the furnace wall or cause tube deformation, requiring feeding and discharging one by one during batch processing, and the time-consuming operation per operation.

[0006] According to one aspect, at least one embodiment of this disclosure provides a pit-type nitriding furnace for processing bicycle shaped tubes, characterized in that it comprises: The furnace body, the outer ring frame, and the top frame are provided. The outer ring frame is located outside the furnace body, and the top frame is fixed to the upper surface of the outer ring frame. A sealing cover and a lifting assembly are provided. The sealing cover is vertically and movably connected to the furnace body, and the lifting assembly is disposed on the top frame and the sealing cover. A sealing and clamping assembly, wherein the sealing and clamping assembly is disposed on the outer ring frame; The lifting assembly includes several media inlet pipes, all of which are installed on the sealing cover. The sealing cover is provided with an exhaust pipe. The surface of the top frame is provided with a transmission port, and a wire feeding reel driven by electricity is provided inside the transmission port. A steel cable is provided on the wire feeding reel.

[0007] As a further technical solution, the surface of the sealing cover is provided with a fixing protrusion, the fixing protrusion is fixedly connected to the lower end of the steel cable, and a pair of connecting rods are provided at both ends of the bottom of the sealing cover, with a tray at the lower end of the connecting rod.

[0008] According to another aspect, in at least one embodiment of the present invention, the sealing and pressing assembly includes a pair of fixed seats, the fixed seats are disposed at both ends of the top of the outer ring frame, and a first hydraulic cylinder is horizontally mounted on the outer surface of each fixed seat, and a pressing frame is disposed at the output end of the first hydraulic cylinder.

[0009] As a further technical solution, both ends of the sealing cover are provided with mating grooves, the clamping frame can be inserted into the mating grooves, the side surface of the top frame is provided with an opening, and a second hydraulic cylinder is installed vertically upward at the bottom of the outer ring frame.

[0010] As a further technical solution, the output end of the second hydraulic cylinder is provided with a rack, and a pressure plate is rotatably connected to the through-hole via a rotating shaft. An external gear is provided on the surface of the pressure plate, and the external gear meshes with the rack.

[0011] As a further technical solution, the clamping plate can be rotated 90° via a rotating shaft and then pressed against the surface of the sealing cover.

[0012] As a further technical solution, a stabilizing rod is provided on the side surface of the top frame, and the stabilizing rod is vertically and movably connected to the rack.

[0013] As a further technical solution, the top frame has an overall L-shaped structure, and the cable reel is located directly above the center of the sealing cover.

[0014] The beneficial effects of the embodiments disclosed herein are as follows: This disclosure solves the problems of inconvenient material loading and unloading and easy damage to workpieces in traditional nitriding furnaces by using a lifting assembly. The cable reel is located directly above the center of the sealing cover, and the synchronous loading and unloading of the steel cable drives the sealing cover to rise and fall vertically, avoiding tilting and offset. With the positioning groove of the bottom tray, irregular tubes do not need to be repeatedly adjusted after placement, effectively preventing collisions with the furnace wall or tube deformation caused by the center of gravity shift. The tray can carry irregular tubes in batches, replacing the traditional method of loading and unloading one by one, greatly shortening the operation time, reducing equipment idle waiting time, and improving batch processing efficiency. The medium inlet pipe on the sealing cover is evenly distributed, ensuring rapid and uniform diffusion of the nitriding medium, and the exhaust pipe promptly discharges redundant gas, maintaining a stable atmosphere inside the furnace and ensuring uniform nitriding layer quality.

[0015] The entire assembly integrates workpiece bearing, lifting, and media conveying functions, eliminating the need for manual lifting or simple hook hoisting, reducing labor intensity, and adapting to the irregular and length-varying structural characteristics of bicycle tubes, thus solving the core pain point of poor adaptability of traditional equipment. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments of this disclosure will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this disclosure and these drawings without any creative effort.

[0017] Figure 1 This is a schematic diagram of a structure in one embodiment of the present disclosure; Figure 2 This is an isometric drawing of the present disclosure; Figure 3 Appendix to this disclosure Figure 1 Enlarged view of part A in the middle; In the diagram: 1. Furnace body; 2. Outer ring frame; 3. Top frame; 4. Sealing cover; 5. Lifting assembly; 5-1. Medium inlet pipe; 5-2. Exhaust pipe; 5-3. Transmission port; 5-4. Cable reel; 5-5. Steel cable; 5-6. Fixing protrusion; 5-7. Connecting rod; 5-8. Tray; 6. Sealing and pressing assembly; 6-1. Fixing seat; 6-2. First hydraulic cylinder; 6-3. Pressing frame; 6-4. Connecting groove; 6-5. Through port; 6-6. Second hydraulic cylinder; 6-7. Rack; 6-8. Pressing plate; 6-9. External gear; 7. Stabilizing rod. Detailed Implementation

[0018] The present disclosure will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present disclosure and are not intended to limit the scope of the disclosure.

[0019] To keep the drawings concise, each drawing only schematically shows the parts relevant to the disclosure; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0020] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0021] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0022] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0023] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] like Figures 1-3 As shown, a pit-type nitriding furnace for processing bicycle shaped tubes is illustrated in one embodiment of this disclosure, comprising: The furnace body 1, the outer ring frame 2, and the top frame 3 are provided. The outer ring frame 2 is located outside the furnace body 1, and the top frame 3 is fixed to the upper surface of the outer ring frame 2. The sealing cover 4 and the lifting assembly 5 are provided. The sealing cover 4 is vertically and movably connected to the furnace body 1, and the lifting assembly 5 is provided on the top frame 3 and the sealing cover 4. A sealing and clamping assembly 6 is disposed on the outer ring frame 2; The lifting assembly 5 includes several media inlet pipes 5-1, all of which are mounted on the sealing cover 4. The sealing cover 4 is provided with an exhaust pipe 5-2. The top frame 3 has a transmission port 5-3 on its surface. A wire feeding reel 5-4 driven by electricity is installed inside the transmission port 5-3. A steel cable 5-5 is installed on the wire feeding reel 5-4. The sealing cover 4 has a fixing protrusion 5-6 on its surface. The fixing protrusion 5-6 is fixedly connected to the lower end of the steel cable 5-5. A pair of connecting rods 5-7 are provided at both ends of the bottom of the sealing cover 4. A tray 5-8 is provided at the lower end of the connecting rods 5-7.

[0025] In some examples, in order to achieve smooth lifting and lowering of the sealing cover 4 and precise feeding and unloading of workpieces, and to solve the problems of shaking and media leakage during feeding and unloading in traditional nitriding furnaces, a lifting assembly 5 was designed. This assembly includes a furnace body 1 made of heat-resistant steel welded together, with an anti-corrosion coating sprayed on the inner wall; an outer ring frame 2 made of welded steel profiles and fixed to the outside of the furnace body 1 with bolts to form a rigid support frame; and a top frame 3 fixed to the upper surface of the outer ring frame 2 by flanges and reinforced with reinforcing ribs to provide a stable installation reference for the lifting transmission components and avoid vibration and displacement during lifting.

[0026] The sealing cover 4 is forged from alloy steel, with a high-temperature resistant sealing ring inlaid on the edge. It is vertically and movablely fitted onto the top of the furnace body 1, ensuring alignment with the axis of the furnace body 1 during lifting and lowering. Several medium inlet pipes 5-1 are connected to the sealing cover 4 by threaded sealing, evenly distributed along the circumference of the cover, for inlet nitriding medium. The pipe body is made of high-temperature resistant alloy material to avoid medium corrosion. The exhaust pipe 5-2 is welded to the sealing cover 4 and equipped with a one-way valve to prevent medium backflow. The transmission port 5-3 on the surface of the top frame 3 is milled. The wire feeding reel 5-4 is rotatably connected to the transmission port 5-3 through a bearing and driven to rotate by a geared motor. One end of the steel cable 5-5 is fixed to the wire feeding reel 5-4, and the lower end is bolted to the fixing protrusion 5-6 on the surface of the sealing cover 4. The synchronous winding and unwinding of multiple steel cables 5-5 realizes the smooth lifting and lowering of the sealing cover 4.

[0027] The connecting rods 5-7 at both ends of the bottom of the sealing cover 4 are welded and fixed to the cover body. The lower end is rigidly connected to the tray 5-8 through the flange. The surface of the tray 5-8 is provided with positioning grooves adapted to the shaped tubes for clamping the workpieces to be processed. During the lifting process, the tray 5-8 remains horizontal to ensure that the shaped tubes enter and exit the furnace body 1 smoothly and avoid collision damage.

[0028] like Figures 1-3As shown in the figure, the sealing and pressing assembly 6 in this embodiment includes a pair of fixed seats 6-1. The fixed seats 6-1 are disposed at both ends of the top of the outer ring frame 2. A first hydraulic cylinder 6-2 is horizontally mounted on the outer surface of each fixed seat 6-1. A pressing frame 6-3 is provided at the output end of the first hydraulic cylinder 6-2. A mating groove 6-4 is provided at both ends of the surface of the sealing cover 4. The pressing frame 6-3 can be inserted into the mating groove 6-4. A through-hole 6-5 is provided on the side surface of the top frame 3. A second hydraulic cylinder 6-6 is vertically mounted on the bottom of the outer ring frame 2. A rack 6-7 is provided at the output end of the second hydraulic cylinder 6-6. A pressing plate 6-8 is rotatably connected to the through-hole 6-5 through a rotating shaft. An external gear 6-9 is provided on the surface of the pressing plate 6-8. The external gear 6-9 meshes with the rack 6-7.

[0029] In some examples, in order to achieve a tight fixation between the sealing cover 4 and the furnace body 1 and to solve the problems of uneven pressure and media leakage in traditional sealing structures, a sealing and pressing assembly 6 was designed. This assembly includes an outer ring frame 2 made of high-strength steel welded together, and fixed seats 6-1 at both ends of the top welded to the outer ring frame 2. The surface is milled flat to provide a horizontal installation reference for the first hydraulic cylinder 6-2 and ensure accurate thrust direction.

[0030] The first hydraulic cylinder 6-2 on the outside of the fixed base 6-1 is horizontally installed via a flange, and its output end is bolted to the clamping frame 6-3. The clamping frame 6-3 is forged from alloy steel, and its end is machined into a wedge-shaped structure. The mating groove 6-4 on the surface of the sealing cover 4 is precisely matched with the clamping frame 6-3. When the hydraulic cylinder extends or retracts, it drives the clamping frame 6-3 to insert into the mating groove 6-4, thereby achieving lateral clamping and positioning of the sealing cover 4. The through-hole 6-5 on the side surface of the top frame 3 is milled, and the clamping plate 6-8 is rotatably connected to the through-hole 6-5 via a rotating shaft. The end of the plate is attached to the top surface of the sealing cover 4. The second hydraulic cylinder 6-6 at the bottom of the outer ring frame 2 is vertically installed upward via a bracket, and its output end is bolted to the rack 6-7. The rack 6-7 slides along the guide groove on the side surface of the outer ring frame 2 and precisely meshes with the external gear 6-9 on the surface of the clamping plate 6-8.

[0031] The second hydraulic cylinder 6-6 extends and retracts, driving the rack 6-7 to rise and fall. Through gear transmission, it drives the pressure plate 6-8 to rotate around the rotating shaft, pressing the sealing cover 4 downwards and ensuring that the sealing ring at the edge of the sealing cover 4 fits tightly against the top surface of the furnace body 1. The transverse pressure frame 6-3 and the longitudinal pressure plate 6-8 form a double locking structure, ensuring the sealing performance of the nitriding furnace during operation, preventing leakage of high-temperature and high-pressure media, and guaranteeing the quality of nitriding processing and operational safety.

[0032] For example, such as Figure 3 As shown, the clamping plate 6-8 can be rotated 90° via the rotating shaft and then pressed against the surface of the sealing cover 4.

[0033] In some examples, the clamping plate 6-8 is rotatably connected to the top frame 3 via a rotating shaft, with a limit block at the shaft end precisely controlling the 90° rotation stroke. A high-temperature resistant rubber gasket is attached to the end face of the clamping plate 6-8 facing the sealing cover 4, and after rotation into position, the rubber gasket fits tightly against the top surface of the sealing cover 4. This structure forms a multi-layer seal through surface contact compaction of the sealing ring, combined with lateral clamping, improving sealing performance under high-pressure conditions.

[0034] For example, such as Figure 1 As shown, a stabilizing rod 7 is provided on the side surface of the top frame 3, and the stabilizing rod 7 is vertically and movably connected to the rack 6-7.

[0035] In some examples, the stabilizing rod 7 is made of seamless steel pipe and is horizontally fixed to the side surface of the top frame 3 by a bracket. The surface of the rod is honed. The stabilizing rod 7 and the guide hole of the rack 6-7 are fitted with clearance to form a vertical guide pair, which can limit the lateral displacement of the rack 6-7 when it is raised and lowered, ensure that the rack 6-7 meshes accurately with the external gear 6-9, and ensure the stable and reliable rotation of the pressure plate 6-8.

[0036] For example, such as Figure 1 As shown, the top frame 3 has an overall L-shaped structure, and the cable reel 5-4 is located directly above the center of the sealing cover 4.

[0037] In some examples, the top frame 3 is welded from alloy steel into an L-shape. The horizontal section is reinforced with stiffeners to increase rigidity, and the vertical section is bolted to the outer ring frame 2. The wire feeding reel 5-4 is fixed to the center of the horizontal section via a bearing seat, directly opposite the center of the sealing cover 4. The steel cable 5-5 is vertically connected to the fixing protrusion 5-6. This layout ensures that the sealing cover 4 is subjected to balanced force, preventing tilting or offset during lifting and ensuring smooth entry and exit of workpieces from and from the furnace.

[0038] In actual use: Fix the furnace body 1 on a flat ground, fit the outer ring frame 2 onto the outside of the furnace body 1 and lock it, fix the top frame 3 on the upper surface of the outer ring frame 2 to ensure the rigidity of the overall structure, install the wire feeding reel 5-4 in the transmission port 5-3 of the top frame 3, connect the lower end of the steel cable 5-5 to the fixing protrusion 5-6 of the sealing cover 4, fix the connecting rod 5-7 at the bottom of the sealing cover 4 to the tray 5-8, neatly place the bicycle shaped tube to be processed in the positioning groove of the tray 5-8 to ensure stable placement; start the lifting component 5, the electric drive of the wire feeding reel 5-4 to rotate and release the steel cable 5-5, the sealing cover 4 descends vertically, and slowly pulls the tray 5-8 and the shaped tube into the furnace body 1. After reaching the position, the wire feeding reel 5-4 stops moving; start the sealing and pressing component 6, the first hydraulic cylinder at the top of the outer ring frame 2 6-2 pushes the clamping frame 6-3, inserts it into the mating groove 6-4 of the sealing cover 4 to achieve lateral clamping. The second hydraulic cylinder 6-6 at the bottom of the outer ring frame 2 drives the rack 6-7 to rise and fall. Through meshing with the external gear 6-9, it drives the clamping plate 6-8 to rotate around the rotating shaft. After the clamping plate 6-8 rotates, it presses against the surface of the sealing cover 4 to form longitudinal compaction. Nitriding medium is introduced through the medium inlet pipe 5-1 on the sealing cover 4, and excess gas is discharged through the exhaust pipe 5-2 to maintain a stable nitriding atmosphere in the furnace. After the nitriding treatment is completed, the second hydraulic cylinder 6-6 is driven in the reverse direction to reset the clamping plate 6-8. The first hydraulic cylinder 6-2 retracts the clamping frame 6-3. The wire reel 5-4 retracts the steel cable 5-5, which drives the sealing cover 4 to rise. The tray 5-8 lifts the shaped tube and moves it out of the furnace body 1, completing one processing cycle.

[0039] It should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure and are not intended to limit it. Although this disclosure has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this disclosure without departing from the spirit and scope of the technical solutions of this disclosure, and all such modifications and substitutions should be covered within the scope of the claims of this disclosure.

Claims

1. A pit-type nitriding furnace for processing irregularly shaped bicycle tubes, characterized in that, include: The furnace body (1), the outer ring frame (2) and the top frame (3) are provided outside the furnace body (1) and the top frame (3) is fixed to the upper surface of the outer ring frame (2). A sealing cover (4) and a lifting assembly (5) are provided. The sealing cover (4) is vertically and movably connected to the furnace body (1). The lifting assembly (5) is provided on the top frame (3) and the sealing cover (4). A sealing and clamping assembly (6) is disposed on the outer ring frame (2); The lifting assembly (5) includes several media inlet pipes (5-1), all of which are installed on the sealing cover (4). The sealing cover (4) is provided with an exhaust pipe (5-2). The top frame (3) has a transmission port (5-3) on its surface. The transmission port (5-3) is provided with a wire feeding reel (5-4) that is driven to rotate by electricity. The wire feeding reel (5-4) is provided with a steel cable (5-5).

2. The pit-type nitriding furnace for processing bicycle shaped tubes according to claim 1, characterized in that, The sealing cover (4) is provided with a fixing protrusion (5-6) on its surface. The fixing protrusion (5-6) is fixedly connected to the lower end of the steel cable (5-5). A pair of connecting rods (5-7) are provided at both ends of the bottom of the sealing cover (4). A tray (5-8) is provided at the lower end of the connecting rod (5-7).

3. The pit-type nitriding furnace for processing bicycle shaped tubes according to claim 1, characterized in that, The sealing and pressing assembly (6) includes a pair of fixed seats (6-1), which are located at both ends of the top of the outer ring frame (2). A first hydraulic cylinder (6-2) is horizontally mounted on the outer surface of each fixed seat (6-1), and a pressing frame (6-3) is provided at the output end of the first hydraulic cylinder (6-2).

4. A pit-type nitriding furnace for processing bicycle shaped tubes according to claim 3, characterized in that, The sealing cover (4) has a mating groove (6-4) at both ends, and the clamping frame (6-3) can be inserted into the mating groove (6-4). The top frame (3) has a through opening (6-5) on its side surface, and the outer ring frame (2) has a second hydraulic cylinder (6-6) installed vertically upward at its bottom.

5. A pit-type nitriding furnace for processing bicycle shaped tubes according to claim 4, characterized in that, The output end of the second hydraulic cylinder (6-6) is provided with a rack (6-7), and a pressure plate (6-8) is rotatably connected to the through-hole (6-5) via a rotating shaft. An external gear (6-9) is provided on the surface of the pressure plate (6-8), and the external gear (6-9) meshes with the rack (6-7).

6. A pit-type nitriding furnace for processing bicycle shaped tubes according to claim 5, characterized in that, The pressing plate (6-8) can be rotated 90° by the rotating shaft and pressed against the surface of the sealing cover (4).

7. A pit-type nitriding furnace for processing bicycle shaped tubes according to claim 5, characterized in that, The top frame (3) is provided with a stabilizing rod (7) on its side surface, and the stabilizing rod (7) is vertically and movably connected to the rack (6-7).

8. A pit-type nitriding furnace for processing bicycle shaped tubes according to claim 1, characterized in that, The top frame (3) has an overall L-shaped structure, and the wire feeding reel (5-4) is located directly above the center of the sealing cover (4).

Images