Corrosion-resistant handle nitriding device and nitriding method

Abstract

The application relates to the technical field of metal surface heat treatment, and provides a corrosion-resistant handle nitriding treatment device and a nitriding treatment method, which comprise a nitriding mechanism, a sealing mechanism and a limiting mechanism, the sealing mechanism is assembled at the top of the nitriding mechanism, the limiting mechanism is assembled at the bottom surface middle part of the sealing mechanism, and the sealing mechanism is arranged in the top end inside of the nitriding mechanism. The servo motor is driven through the limiting mechanism, the inner cylinder and the outer cylinder are relatively rotated, the arc-shaped elastic limiting plate is driven to adaptively adjust the opening and closing degree, the accurate limiting and fixing of handle workpieces of different specifications can be realized, and the collision and toppling of the workpieces in the nitriding process are avoided.

Description

Technical Field

[0001] This invention relates to the field of metal surface heat treatment technology, specifically to a corrosion-resistant handlebar nitriding device and nitriding method. Background Technology

[0002] As a core control component of bicycles and electric bikes, metal handlebars are constantly exposed to complex outdoor environments, enduring various effects such as wind and rain erosion, sweat contact, and external friction. Therefore, extremely high requirements are placed on their surface corrosion resistance, hardness, and structural stability. Currently, commonly used materials for metal handlebars include carbon steel, low-alloy steel, and stainless steel, and their surface treatment methods mainly include electroplating, painting, and ordinary nitriding.

[0003] Existing handlebar nitriding treatment devices mostly adopt a traditional nitriding box structure, where multiple handlebar parts are directly placed into the nitriding box for nitriding treatment. This method has obvious technical defects: First, there is no dedicated limiting and fixing structure for the workpieces. When too many workpieces are placed, they are prone to collision and tipping, resulting in uneven contact between the workpiece surface and the nitriding gas. The final nitrided layer is of varying thickness, affecting corrosion resistance and structural stability. Second, the nitriding gas is mostly conveyed from one side, resulting in uneven gas distribution within the furnace, further exacerbating the problem of uneven nitrided layer. Third, the sealing performance of the nitriding box is poor, making it prone to gas leakage, which not only affects the nitriding effect but also wastes gas. Summary of the Invention

[0004] To overcome the above-mentioned defects, embodiments of the present invention provide a corrosion-resistant handlebar nitriding device and nitriding method, which solves the technical problem in the related art that when using the nitriding device, multiple workpieces are usually placed directly into the nitriding chamber. If too many workpieces are placed, they are prone to collision or tipping, resulting in uneven nitriding layer on the workpiece surface.

[0005] At least one embodiment of the present invention provides a corrosion-resistant handlebar nitriding treatment device, comprising: a nitriding mechanism, a sealing mechanism, and a limiting mechanism, wherein the sealing mechanism is assembled on the top of the nitriding mechanism, the limiting mechanism is assembled on the middle of the bottom surface of the sealing mechanism, and the sealing mechanism is disposed inside the top of the nitriding mechanism.

[0006] Preferably, a sealing gasket is fixedly connected to the top of the nitriding tank, and the top surface of the sealing gasket is provided with a plurality of positioning grooves in a ring-shaped array. A plurality of support seats are fixedly connected to the outer wall of the nitriding tank in a ring-shaped array, and a plurality of vents are provided to the inner wall of the nitriding tank in a ring-shaped array.

[0007] Preferably, the plurality of connecting pipes are arranged in a ring array on the outer wall of the nitriding tank, with the inward end of the plurality of connecting pipes adapted to and connected to the vent, and the outward end of the plurality of connecting pipes connected to the gas collection box, the bottom surface of the gas collection box being connected to the top surface of the base.

[0008] Preferably, an air inlet is fixedly connected to the surface of the air collection box, the air inlet is connected to the air collection box, and a valve is provided inside the air inlet pipe. The valve is electrically connected to the controller, and the controller is located on the top surface of the base.

[0009] Preferably, the connecting pipe passes through the bottom and base of the nitriding tank, and a venting plate is fixedly connected to the top surface of the connecting pipe and the two are connected. The top surface of the venting plate is provided with an air hole, and the bottom end of the connecting pipe is provided with an air valve, which is electrically connected to the controller.

[0010] Preferably, the sealing mechanism includes a second sealing gasket and an electric pusher cylinder. The electric pusher cylinder is connected to the support base by bolts and is electrically connected to the controller. The output end of the electric pusher cylinder is fixedly connected to a can lid. The bottom surface of the can lid is provided with a positioning block. The inner diameter of the second sealing gasket is adapted to that of the first sealing gasket. The outer wall of the second sealing gasket is provided with a positioning block, and the positioning block is inserted into a positioning groove.

[0011] Preferably, the limiting mechanism includes a drive motor, a connector, and a limiting plate. The drive motor is fixedly connected to the bottom surface of the second sealing gasket by bolts, and the drive motor is electrically connected to the controller. The output end of the drive motor is keyed to the connector, and a ring plate is fixedly connected to the bottom surface of the connector.

[0012] Preferably, an inner cylinder is fixedly connected to the bottom surface of the ring plate, and a first fixing column is arranged in a ring on the bottom surface of the inner cylinder. An outer cylinder is rotatably connected to the outer wall of the inner cylinder, and a second fixing column is fixedly connected in a ring on the bottom surface of the outer cylinder.

[0013] Preferably, one end of the limiting plate is provided with a movable hole, which is adapted to and rotatably connected to the first fixed post, and the other end of the limiting plate is provided with a long strip-shaped sliding groove, which is slidably connected to the second fixed post.

[0014] A method for nitriding corrosion-resistant handlebars includes the following steps: Pre-treatment of workpieces: The surface of the handle workpieces to be nitrided is degreased, derusted, and polished to remove surface oil, rust and burrs. After cleaning, it is dried for later use. Workpiece loading and positioning: The controller controls the electric push cylinder to lift the can lid and the limiting mechanism upwards, placing the pre-treated handlebar workpiece into the vent plate inside the nitriding can. The controller then controls the drive motor to rotate the connecting parts and the ring plate, which in turn rotates the inner cylinder, causing the first fixed column to slide around the second fixed column until the inner wall of the limiting plate is tightly fitted with the outer wall of the handlebar workpiece, thus completing the workpiece's limiting and fixing. Sealing and vacuuming: The controller controls the electric pusher cylinder to reset, which drives the can cover to move downward, so that the second sealing gasket fits tightly with the first sealing gasket. The positioning block is inserted into the positioning groove to achieve the sealing of the nitriding can. Then, the can is evacuated to a vacuum state through the air extraction port of the nitriding can, and the vacuum degree is controlled within the preset range. Segmented nitrogen supply: By opening valve one and the gas valve through the controller, the nitrogen gas enters the gas collection box through the gas inlet, and then enters the upper part of the nitrogen tank through the connecting pipe and the gas inlet. At the same time, the nitrogen gas enters the lower part of the nitrogen tank through the gas holes of the connecting pipe and the gas vent plate, realizing the bidirectional supply of nitrogen gas from top to bottom; first, nitrogen gas is introduced to replace the nitrogen tank, and after the replacement is completed, a mixture of ammonia and nitrogen nitrogen gas is introduced. The volume fraction of ammonia in the mixture is 60% to 80%, and the gas pressure in the tank is controlled at 0.02 to 0.05 MPa. Temperature-controlled nitriding: The nitriding tank is heated by a heating element connected to a controller. The heating element is electrically connected to the controller to control the nitriding temperature and time in stages. The first stage: the temperature is raised to 450~480℃ and held for 2~3 hours. The second stage: the temperature is raised to 520~560℃ and held for 4~6 hours. During the nitriding process, the temperature inside the tank is kept stable by the insulation layer and the heat insulation layer. The controller adjusts the opening of valve one and the gas valve to ensure a continuous and uniform supply of nitriding gas. Cooling and unloading: After nitriding, turn off the heating components and keep the gas pressure inside the tank constant. First, let the furnace cool naturally to below 300°C, then introduce cooling nitrogen to accelerate cooling to room temperature. After cooling, control the electric push cylinder to lift the tank cover through the controller, control the drive motor to rotate in the opposite direction to release the limit plate and remove the nitrided handlebar workpiece, thus completing the entire nitriding process.

[0015] This invention provides a corrosion-resistant handlebar nitriding treatment device. Compared with the prior art, it uses a servo motor driven by a limiting mechanism. The relative rotation of the inner and outer cylinders drives the arc-shaped elastic limiting plate to adaptively adjust the opening and closing degree, which can achieve precise limiting and fixing of handlebar workpieces of different specifications, avoid collision and tipping of workpieces during nitriding, and ensure uniform contact between workpieces and nitriding gas. At the same time, through the bidirectional gas delivery structure, the upper part achieves annular gas delivery through a gas collection box, connecting pipe, and vent, while the lower part achieves uniform gas delivery through a connecting pipe and vent plate, so that the nitriding gas is evenly distributed in the nitriding tank, effectively solving the problem of uneven gas distribution. Attached Figure Description

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

[0017] Figure 1 This is a schematic diagram of a corrosion-resistant handlebar nitriding device and nitriding method provided in an embodiment of the present invention; Figure 2 This is an embodiment of the present invention. Figure 1 A schematic diagram of the cross-sectional structure; Figure 3 This is an embodiment of the present invention. Figure 1 Schematic diagram of the nitriding mechanism; Figure 4 This is an embodiment of the present invention. Figure 2 Schematic diagram of the middle sealing mechanism; Figure 5 This is an embodiment of the present invention. Figure 4 Schematic diagram of the middle limit mechanism; Figure 6 This is an embodiment of the present invention. Figure 5 A schematic diagram of the exploded structure of the limiting mechanism; In the diagram: 1. Nitriding mechanism; 11. Base; 12. Foot support; 13. Nitriding tank; 14. Support base; 15. Connecting pipe; 16. Air inlet; 17. Valve 1; 18. Gas collection box; 19. Sealing gasket 1; 110. Vent; 111. Positioning groove; 112. Insulation layer; 113. Heat insulation layer; 114. Connecting pipe; 115. Vent plate; 116. Air hole; 117. Controller; 2. Sealing mechanism; 21. Tank cover; 22. Sealing gasket 2; 23. Positioning block; 24. Electric pusher cylinder; 3. Limiting mechanism; 31. Drive motor; 32. Connecting piece; 33. Outer cylinder; 34. Ring plate; 35. Inner cylinder; 36. Fixed column 1; 37. Fixed column 2; 38. Limiting plate; 39. Slide groove; 310. Movable hole. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0019] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an indirect connection through an intermediate medium, or the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0020] In the description of this application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not 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 application.

[0021] The terms "first," "second," "third," "fourth," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in a sequence other than those illustrated or described herein.

[0022] To make the drawings concise and easy to understand, some drawings only show one of the components with the same structure or function, or only one of them is marked. In this article, "one" not only means "only one", but can also mean "more than one", and "several" includes "two" and "more than two".

[0023] Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus. It is understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. The embodiments of this application are described in detail below with reference to the accompanying drawings.

[0024] Example 1: like Figures 1-6 As shown, an embodiment of the present invention illustrates a corrosion-resistant handlebar nitriding treatment device, comprising: a nitriding mechanism 1, a sealing mechanism 2, and a limiting mechanism 3. The sealing mechanism 2 is mounted on the top of the nitriding mechanism 1, and the limiting mechanism 3 is mounted on the middle of the bottom surface of the sealing mechanism 2. The sealing mechanism 2 is located inside the top of the nitriding mechanism 1. The nitriding mechanism 1 is used to nitrid the handlebar; the sealing mechanism 2 is used to seal; and the limiting mechanism 3 is used to limit and fix the handlebar to prevent collisions or tipping, which would result in uneven contact between the workpiece surface and the nitriding gas, ultimately forming a nitriding layer of varying thickness, affecting corrosion resistance and structural stability.

[0025] like Figures 1-3As shown, this invention illustrates a corrosion-resistant handlebar nitriding device according to an embodiment of the present invention. The nitriding mechanism 1 includes a base 11, multiple connecting pipes 15, an air collection box 18, a connecting pipe 114, and a controller 117. Supports 12 are fixedly connected to the four corners of the bottom surface of the base 11. A nitriding tank 13 is provided on the top surface of the base 11. An insulation layer 112 is provided on the inner wall of the nitriding tank 13. A heat insulation layer 113 is provided in the interlayer of the pipe wall of the nitriding tank 13. A sealing gasket 19 is fixedly connected to the top of the nitriding tank 13. The top surface of the nitriding tank 13 has multiple positioning grooves 111 evenly arranged in a ring. Multiple support seats 14 are evenly fixedly connected to the outer wall of the nitriding tank 13 in a ring. Multiple vents 110 are arranged in a ring on the inner wall of the nitriding tank 13. Multiple connecting pipes 15 are arranged in a ring on the outer wall of the nitriding tank 13. The inward end of each connecting pipe 15 is matched with a vent 110 and the two are connected. The outward end of each connecting pipe 15 is connected to a gas collection box 18. The bottom surface of the gas collection box 18 is connected to the top surface of the base 11. The surface of the gas collection box 18... An air inlet 16 is fixedly connected to the air collection box 18. A valve 17 is installed inside the air inlet pipe of the air inlet 16. The valve 17 is electrically connected to the controller 117, which is located on the top surface of the base 11. A connecting pipe 114 passes through the bottom of the nitriding tank 13 and the base 11. A vent plate 115 is fixedly connected to the top surface of the connecting pipe 114, and the two are connected. An air hole 116 is opened on the top surface of the vent plate 115. An air valve is located at the bottom end of the connecting pipe 114, and the air valve is electrically connected to the controller 117. The base 11 is connected in section 12, which is an adjustable metal support used to adjust the level of the base 11. A nitriding tank 13 is fixedly installed on the top surface of the base 11. The nitriding tank 13 is a cylindrical sealed tank made of stainless steel. An insulation layer 112 is attached to its inner wall. The insulation layer 112 is an aluminum silicate fiber insulation layer. A heat insulation layer 113 is installed in the interlayer of the tube wall of the nitriding tank 13. The heat insulation layer 113 is a vacuum heat insulation plate layer. The insulation layer 112 and the heat insulation layer 113 work together to effectively maintain the stable temperature inside the tank and reduce heat loss.

[0026] A sealing gasket 19 is fixedly connected to the top surface of the nitriding tank 13. The sealing gasket 19 is made of fluororubber, which has good temperature resistance and sealing performance. Multiple positioning grooves 111 are evenly arranged in a ring on its top surface. Multiple support seats 14 are evenly fixedly connected to the outer wall of the nitriding tank 13 in a ring. The support seats 14 are metal welded seats used to install the electric pusher cylinder 24. Multiple vents 110 are arranged in a ring in the upper middle part of the inner wall of the nitriding tank 13. The inner side of the vents 110... A gas distribution network is provided to ensure uniform diffusion of the nitriding gas. Multiple connecting pipes 15 are arranged in a ring array on the outer wall of the nitriding tank 13, each corresponding to a vent 110. The inward end of each connecting pipe 15 is fitted to a vent 110 and the two are sealed together. The outward ends of each connecting pipe 15 are sealed together with a gas collecting box 18. The gas collecting box 18 is a ring-shaped gas collecting box made of stainless steel, and its bottom surface is fixedly connected to the top surface of the base 11, realizing centralized distribution and ring-shaped transportation of the nitriding gas. An air inlet 16 is fixedly connected to the outer wall of the gas collecting box 18. The air inlet 16 is used to connect to the nitriding gas transportation pipeline and is connected to the inside of the gas collecting box 18. A valve 17 is installed inside the air inlet pipe of the air inlet 16. The valve 17 is an electromagnetic control valve and is electrically connected to a controller 117. The controller 117 is fixedly installed on one side of the top surface of the base 11. The controller 117 can precisely control the opening degree of the valve 17 and adjust the gas flow rate. The connecting pipe 114 vertically penetrates the bottom of the nitriding tank 13 and the base 11 and is sealed to both. A venting plate 115 is fixedly connected to the top surface of the connecting pipe 114. The venting plate 115 is a stainless steel disc, and the connecting pipe 114 is connected to the inside of the venting plate 115. Multiple air holes 116 are evenly opened on the top surface of the venting plate 115. The air holes 116 are conical holes to facilitate the uniform spraying of nitriding gas. A gas valve is provided at the bottom end of the connecting pipe 114. The gas valve is an electromagnetic gas valve and is electrically connected to the controller 117 to achieve precise control of the gas in the lower part of the nitriding tank 13. The nitriding tank 13 is also equipped with a temperature sensor and a pressure sensor, both of which are electrically connected to the controller 117 to monitor the temperature and pressure inside the tank in real time and achieve precise control. The outer wall of the nitriding tank 13 is equipped with a heating component, which is an electric heating wire embedded in the tube wall interlayer of the nitriding tank 13 and electrically connected to the controller 117 to provide a heat source for the nitriding process.

[0027] like Figure 4As shown, this invention illustrates a corrosion-resistant handlebar nitriding device according to an embodiment of the present invention. The sealing mechanism 2 includes a second sealing gasket 22 and an electric push cylinder 24. The electric push cylinder 24 is connected to the support base 14 by bolts and is electrically connected to the controller 117. The output end of the electric push cylinder 24 is fixedly connected to a can lid 21. The bottom surface of the can lid 21 is provided with a positioning block 23. The second sealing gasket 22 is adapted to the inner diameter of the first sealing gasket 19. The outer wall of the second sealing gasket 22 is provided with a positioning block 23, which is inserted into the positioning groove 111. The controller 117 can control the extension and retraction stroke of the electric push cylinder 24. The output end of the electric push cylinder 24 is vertically downward and fixedly connected to the can lid 21. The can lid 21 is adapted to the top of the nitriding can 13. A second sealing gasket 22 is fitted to the bottom surface of the can lid 21. The inner diameter of the second sealing gasket 22 is compatible with that of the first sealing gasket 19, and both are made of fluororubber. Positioning blocks 23 are fixedly arranged in a ring array on the outer wall of the second sealing gasket 22. The positioning blocks 23 are hard rubber blocks that fit into and can be sealed into the positioning groove 111, achieving precise positioning and sealing between the can lid 21 and the nitriding tank 13, preventing gas leakage during nitriding. A vacuum port is also provided on the top surface of the can lid 21, which is connected to the interior of the nitriding tank 13. An electromagnetic control valve is installed on the vacuum port, which is electrically connected to the controller 117 for vacuuming the tank before nitriding.

[0028] like Figures 5-6As shown, this invention illustrates a corrosion-resistant handlebar nitriding treatment device according to an embodiment of the present invention. The limiting mechanism 3 includes a drive motor 31, a connector 32, and a limiting plate 38. The drive motor 31 is fixedly connected to the bottom surface of the sealing washer 22 by bolts, and the drive motor 31 is electrically connected to the controller 117. The output end of the drive motor 31 is keyed to the connector 32. A ring plate 34 is fixedly connected to the bottom surface of the connector 32, and an inner cylinder 35 is fixedly connected to the bottom surface of the ring plate 34. The bottom surface of the inner cylinder 35 has a ring array of fixing posts 36. An outer cylinder 33 is rotatably connected to the outer wall of the inner cylinder 35, and a ring array of fixing posts 37 is fixedly connected to the bottom surface of the outer cylinder 33. One end of the limiting plate 38 has a movable hole 310, which is connected to the fixed plate 38. The first column 36 is adapted and rotatably connected. The other end of the limiting plate 38 is provided with a long strip-shaped sliding groove 39. The sliding groove 39 is slidably connected to the second fixed column 37. The controller 117 can control the rotation direction and angle of the drive motor 31. The output end of the drive motor 31 is vertically downward and keyed to the connector 32. The inner cylinder 35 is fixedly connected to the center of the bottom surface of the ring plate 34. The inner cylinder 35 is an aluminum alloy cylinder. Multiple first fixed columns 36 are fixedly arranged in a ring array on its bottom surface. The outer cylinder 33 is rotatably connected to the outer wall of the inner cylinder 35 through a bearing. The outer cylinder 33 is an aluminum alloy cylinder coaxial with the inner cylinder 35. Multiple second fixed columns 37 are fixedly connected in a ring array on the bottom surface of the outer cylinder 33. The first fixed columns 36 and the second fixed columns 37 are arranged alternately and in the same number. The limiting plate 38 is an arc-shaped elastic limiting plate made of spring steel, which has good elasticity and wear resistance. Its number is the same as that of the first fixing post 36. One end of the limiting plate 38 has a movable hole 310, which is adapted to and rotatably connected to the first fixing post 36. The other end of the limiting plate 38 has a long, narrow sliding groove 39, which is adapted to and slidably connected to the second fixing post 37. A rubber anti-slip pad is fitted to the inner wall of the limiting plate 38 to prevent scratching the surface of the handlebar workpiece during limiting. When the drive motor 31 drives the inner cylinder 35 to rotate, the first fixing post 36 rotates around the axis of the inner cylinder 35, thereby causing the limiting plate 38 to slide around the second fixing post 37, realizing the adjustment of the opening and closing degree of the limiting plate 38. This allows it to adapt to handlebar workpieces of different diameters, achieving precise limiting and fixing.

[0029] Example 2: like Figures 1-6 As shown, on the other hand, the present invention also provides a method for nitriding corrosion-resistant handlebars, comprising the following steps: S1. Pre-treatment of workpiece: The surface of the handle workpiece to be nitrided is degreased, derusted, and polished to remove surface oil, rust and burrs. After cleaning, it is dried for later use. S2. Workpiece loading and positioning: The controller 117 controls the electric push cylinder 24 to move, driving the can cover 21 and the limiting mechanism 3 to lift upward, placing the pre-treated handlebar workpiece into the vent plate 115 inside the nitriding can 13. Then, the controller 117 controls the drive motor 31 to move, driving the connecting piece 32 and the ring plate 34 to rotate, which in turn drives the inner cylinder 35 to rotate, causing the first fixed column 36 to drive the limiting plate 38 to slide around the second fixed column 37 until the inner side wall of the limiting plate 38 is tightly fitted with the outer wall of the handlebar workpiece, completing the workpiece's limiting and fixing. S3, Sealing and Vacuuming: The controller 117 controls the electric pusher cylinder 24 to reset, which drives the can cover 21 to move downward, so that the sealing gasket 22 and the sealing gasket 19 fit tightly together. The positioning block 23 is inserted into the positioning groove 111 to achieve the sealing of the nitriding can 13. Then, the can is evacuated to a vacuum state through the air extraction port of the nitriding can 13, and the vacuum degree is controlled within the preset range. S4. Segmented Nitrogen Supply: Valve 17 and the gas valve are opened via controller 117. Nitrogen gas enters the gas collection box 18 through the inlet 16, and then enters the upper part of the nitriding tank 13 through the connecting pipe 15 and the vent 110. At the same time, the nitriding gas enters the lower part of the nitriding tank 13 through the vent 116 of the connecting pipe 114 and the vent plate 115, realizing bidirectional vertical transportation of nitriding gas. Nitrogen gas is first introduced to replace the nitriding tank 13. After the replacement is completed, a mixture of ammonia and nitrogen nitriding gas is introduced. The volume fraction of ammonia in the mixture is 60% to 80%, and the gas pressure inside the tank is controlled at 0.02 to 0.05 MPa. S5. Temperature-controlled nitriding: The nitriding tank 13 is heated by the heating component. The heating component is electrically connected to the controller 117 to control the nitriding temperature and time in stages. First stage: the temperature is raised to 450~480℃ and held for 2~3 hours; Second stage: the temperature is raised to 520~560℃ and held for 4~6 hours. During the nitriding process, the temperature inside the tank is kept stable by the insulation layer 112 and the heat insulation layer 113. The controller 117 adjusts the opening of valve 17 and the gas valve to ensure a continuous and uniform supply of nitriding gas. S6. Cooling and unloading: After nitriding, turn off the heating components and keep the gas pressure inside the tank constant. First, let the furnace cool naturally to below 300°C, then introduce cooling nitrogen to accelerate cooling to room temperature. After cooling, control the electric push cylinder 24 to lift the tank cover 21 through the controller 117, and control the drive motor 31 to rotate in the opposite direction to release the limit plate 38 and remove the nitrided handlebar workpiece, thus completing the entire nitriding process.

[0030] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A corrosion-resistant handlebar nitriding treatment device, characterized in that, It includes a nitriding mechanism (1), a sealing mechanism (2), and a limiting mechanism (3). The sealing mechanism (2) is mounted on the top of the nitriding mechanism (1), and the limiting mechanism (3) is mounted on the middle of the bottom surface of the sealing mechanism (2). The sealing mechanism (2) is located inside the top of the nitriding mechanism (1). The nitriding mechanism (1) includes a base (11), multiple connecting pipes (15), a gas collection box (18), a connecting pipe (114), and a controller (117). The four corners of the bottom surface of the base (11) are fixedly connected with foot supports (12). The top surface of the base (11) is provided with a nitriding tank (13). The inner wall of the nitriding tank (13) is provided with a heat insulation layer (112). The pipe wall interlayer of the nitriding tank (13) is provided with a heat insulation layer (113).

2. The corrosion-resistant handlebar nitriding treatment device according to claim 1, characterized in that, The top of the nitriding tank (13) is fixedly connected to a sealing gasket (19). The top surface of the sealing gasket (19) is evenly provided with multiple positioning grooves (111) in a ring-shaped array. The outer wall of the nitriding tank (13) is evenly fixedly connected with multiple support seats (14) in a ring-shaped array. The inner wall of the nitriding tank (13) is provided with multiple vents (110) in a ring-shaped array.

3. The corrosion-resistant handlebar nitriding treatment device according to claim 1, characterized in that, Multiple connecting pipes (15) are arranged in a ring on the outer wall of the nitriding tank (13). The inward end of each connecting pipe (15) is adapted to the vent (110) and the two are connected. The outward end of each connecting pipe (15) is connected to the gas collection box (18). The bottom surface of the gas collection box (18) is connected to the top surface of the base (11).

4. The corrosion-resistant handlebar nitriding treatment device according to claim 3, characterized in that, An air inlet (16) is fixedly connected to the surface of the air collection box (18). The air inlet (16) is connected to the air collection box (18). A valve (17) is provided inside the air inlet pipe of the air inlet (16). The valve (17) is electrically connected to the controller (117). The controller (117) is located on the top surface of the base (11).

5. The corrosion-resistant handlebar nitriding treatment device according to claim 1, characterized in that, The connecting pipe (114) penetrates the bottom of the nitriding tank (13) and the base (11). A venting plate (115) is fixedly connected to the top surface of the connecting pipe (114), and the two are connected. A venting hole (116) is opened on the top surface of the venting plate (115). A gas valve is provided at the bottom end of the connecting pipe (114), and the gas valve is electrically connected to the controller (117).

6. The corrosion-resistant handlebar nitriding treatment device according to claim 1, characterized in that, The sealing mechanism (2) includes a second sealing gasket (22) and an electric push cylinder (24). The electric push cylinder (24) is connected to the support base (14) by bolts, and the electric push cylinder (24) is electrically connected to the controller (117). The output end of the electric push cylinder (24) is fixedly connected to the can cover (21). The bottom surface of the can cover (21) is provided with a positioning block (23). The inner diameter of the second sealing gasket (22) is adapted to that of the first sealing gasket (19). The outer wall of the second sealing gasket (22) is provided with a positioning block (23). The positioning block (23) is inserted into the positioning groove (111).

7. The corrosion-resistant handlebar nitriding treatment device according to claim 6, characterized in that, The limiting mechanism (3) includes a drive motor (31), a connector (32), and a limiting plate (38). The drive motor (31) is fixedly connected to the bottom surface of the sealing washer (22) by bolts, and the drive motor (31) is electrically connected to the controller (117). The output end of the drive motor (31) is keyed to the connector (32), and a ring plate (34) is fixedly connected to the bottom surface of the connector (32).

8. The corrosion-resistant handlebar nitriding treatment device according to claim 7, characterized in that, The bottom surface of the ring plate (34) is fixedly connected to the inner cylinder (35), the bottom surface of the inner cylinder (35) is arranged in a ring with a fixed column one (36), the outer wall of the inner cylinder (35) is rotatably connected to the outer cylinder (33), and the bottom surface of the outer cylinder (33) is fixedly connected in a ring with a fixed column two (37).

9. The corrosion-resistant handlebar nitriding treatment device according to claim 8, characterized in that, One end of the limiting plate (38) is provided with a movable hole (310), which is adapted to and rotatably connected to the first fixed post (36). The other end of the limiting plate (38) is provided with a long strip groove (39), which is slidably connected to the second fixed post (37).

10. A method for nitriding corrosion-resistant bicycle handlebars using the apparatus described in any one of claims 1-9, characterized in that, Includes the following steps: S1. Pre-treatment of workpiece: The surface of the handle workpiece to be nitrided is degreased, derusted, and polished to remove surface oil, rust and burrs. After cleaning, it is dried for later use. S2. Workpiece loading and positioning: The controller (117) controls the electric push cylinder (24) to move, driving the can cover (21) and the limiting mechanism (3) to lift upward, placing the pre-treated handlebar workpiece into the ventilation plate (115) inside the nitriding tank (13). Then, the controller (117) controls the drive motor (31) to move, driving the connecting piece (32) and the ring plate (34) to rotate, thereby driving the inner cylinder (35) to rotate, so that the first fixed column (36) drives the limiting plate (38) to slide around the second fixed column (37) until the inner side wall of the limiting plate (38) is tightly attached to the outer wall of the handlebar workpiece, completing the workpiece limiting and fixing. S3, Sealing and Vacuuming: The controller (117) controls the electric push cylinder (24) to reset, which drives the can cover (21) to move downward, so that the sealing gasket two (22) and the sealing gasket one (19) fit tightly together. The positioning block (23) is inserted into the positioning groove (111) to achieve the sealing of the nitriding tank (13). Then, the tank is evacuated to a vacuum state through the air extraction port of the nitriding tank (13), and the vacuum degree is controlled within the preset range. S4. Segmented nitrogen supply: The controller (117) opens valve one (17) and the gas valve. Nitrogen gas enters the gas collection box (18) through the gas inlet (16), and then enters the upper part of the nitriding tank (13) through the connecting pipe (15) and the gas inlet (110). At the same time, the nitriding gas enters the lower part of the nitriding tank (13) through the gas hole (116) of the connecting pipe (114) and the gas plate (115), realizing the bidirectional transmission of nitriding gas from top to bottom. First, nitrogen gas is introduced to replace the nitriding tank (13). After the replacement is completed, a mixture of ammonia and nitrogen nitriding gas is introduced. The volume fraction of ammonia in the mixed gas is 60% to 80%, and the gas pressure in the tank is controlled to be 0.02 to 0.05 MPa. S5, Temperature-controlled nitriding: The nitriding tank (13) is heated by the heating component. The heating component is connected to the controller (117) by electrical signal. The nitriding temperature and time are controlled in stages. First stage: The temperature is raised to 450~480℃ and kept for 2~3 hours. Second stage: The temperature is raised to 520~560℃ and kept for 4~6 hours. During the nitriding process, the temperature inside the tank is kept stable by the insulation layer (112) and the heat insulation layer (113). The controller (117) adjusts the opening of valve 1 (17) and the gas valve to ensure a continuous and uniform supply of nitriding gas. S6. Cooling and unloading: After nitriding, turn off the heating components and keep the gas pressure inside the tank constant. First, let the furnace cool naturally to below 300°C, then introduce cooling nitrogen to accelerate cooling to room temperature. After cooling, control the electric push cylinder (24) to lift the tank cover (21) through the controller (117), and control the drive motor (31) to rotate in the opposite direction to make the limit plate (38) release the workpiece, and take out the nitrided handle workpiece to complete the entire nitriding process.

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