Mould protection nitriding coating device

Abstract

The utility model discloses a mould protection nitriding coating device, which relates to the technical field of mould processing and comprises a vacuum chamber of an inner cavity of a shell, a rotating mechanism, a gas distributor, a heating device and a gas recovery structure, the rotating mechanism is used for fixing the mold through a horizontally rotating bearing disc and a mold positioning groove and driving the mold to dynamically rotate to ensure that all surfaces are uniformly exposed; the gas distributor extends to the middle of the vacuum chamber from the top, and the tail end of the gas distributor is connected with an annular shunting cavity and nitriding gas nozzles distributed in the circumferential direction to realize multi-angle nitrogen injection; the heating device is integrated on the side wall of the shell, and the temperature of the vacuum chamber is accurately regulated to optimize reaction conditions; the gas recovery structure purifies unreacted nitrogen through a filter box and recycles the unreacted nitrogen, so that energy consumption and pollution are reduced; according to the device, through the synergistic effect of the vacuum environment, dynamic rotation and a closed-loop gas system, the coating uniformity and efficiency are improved.

Description

Technical Field

[0001] This utility model relates to the field of mold processing technology, specifically to a mold protection nitriding coating device. Background Technology

[0002] In the mold manufacturing industry, nitriding coating is a key process to improve the surface hardness, wear resistance and corrosion resistance of molds, which directly affects the service life and molding accuracy of molds.

[0003] Traditional nitriding coating processes often use fixed nozzles to spray coatings onto molds that are stationary on a worktable. However, this technology has significant drawbacks in practical applications: the bottom surface of the mold that contacts the worktable is difficult to be effectively covered by nitrogen gas because the nozzle angle is fixed and the mold cannot be dynamically adjusted, which affects the coating efficiency. To address this, we propose a mold protection nitriding coating device. Utility Model Content

[0004] This invention addresses the shortcomings of existing technologies by proposing a mold protection nitriding coating device.

[0005] In order to solve the above-mentioned technical problems, the present invention solves the problem of the difficulty in coating the contact surface between the mold and the worktable in the prior art through the following technical solution.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A mold protection nitriding coating device includes: a housing and a vacuum chamber disposed within the housing cavity; a rotating mechanism including a horizontally rotatable support plate with a mold positioning groove on its surface; a gas distributor extending downward from the top to the middle of the vacuum chamber, with an annular flow divider connected to its end, the flow divider having multiple nitriding gas nozzles evenly distributed circumferentially; a heating device communicating with the vacuum chamber and disposed on the side wall of the housing; and a gas recovery structure disposed on the outside of the housing for recovering nitrogen gas.

[0008] Preferably, the gas distributor has a spiral guide plate inside, which extends axially to form a continuous swirling channel, and its end is connected to the annular diversion cavity.

[0009] Preferably, the rotating mechanism includes a drive shaft that passes through the housing, the drive shaft is rotatably connected to the housing in a sealed manner, the lower end is connected to a servo motor, the upper end is connected to a bearing plate flange, and the servo motor is fixed inside the housing.

[0010] Preferably, the heating device includes radiant heating tubes distributed circumferentially along the vacuum chamber, the surface of which is covered with a silicon carbide protective layer, and a temperature sensor connected to the radiant heating tubes is provided on the inner wall of the vacuum chamber.

[0011] Preferably, the nitriding gas nozzle is tilted downwards, and its injection port adopts a tapered nozzle structure.

[0012] Preferably, the gas recovery structure includes a recovery pipe and a filter box. The recovery pipe is connected to the gas recovery port at the bottom of the shell and the air inlet of the air pump at the top of the shell. The air pump's delivery end is connected to the gas distributor. The filter box is fixed in the middle section of the recovery pipe and has a metal filter, a ceramic particulate filter, and an activated carbon adsorption layer arranged sequentially inside.

[0013] Preferably, the front side of the housing is provided with a double-layer sealing door, including an outer sliding door and an inner lifting door, with a transition cavity formed between the two doors, and an expanded graphite sealing strip is fixedly provided on the edge of the inner lifting door.

[0014] Preferably, the bottom and sides of the positioning groove are fixed with evenly arranged positioning bosses, and an air guide channel is formed between adjacent positioning bosses.

[0015] Preferably, the inner wall of the nozzle is provided with a flow guiding groove.

[0016] Preferably, a high-temperature resistant ceramic pad is embedded on the top of the positioning boss.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] This invention drives the carrier plate to rotate horizontally through a rotating mechanism, so that the mold can dynamically adjust its relative position with the nozzle during the coating process. With the circumferentially evenly distributed nitriding gas nozzles and the positioning bosses set in the positioning groove, a flow channel is formed between the positioning groove and the mold, which facilitates the entry of nitrogen gas. This effectively solves the problem of blind spots in the coverage caused by fixed-angle spraying on the bottom surface of the mold in traditional processes, and significantly improves the uniformity and integrity of the nitriding coating.

[0019] The gas distributor is equipped with a spiral guide plate and an annular diversion chamber, combined with an inclined tapering nozzle, to achieve nitrogen swirling diffusion and precise injection, reducing gas escape; the gas recovery structure purifies and recycles nitrogen through a filter box, which reduces energy consumption and avoids waste gas emissions, combining economy and environmental protection. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0022] Figure 2This is a schematic diagram of the inner lifting door structure of this utility model;

[0023] Figure 3 This is a schematic diagram of the overall structure of this utility model from another perspective;

[0024] Figure 4 This is a schematic diagram of the internal structure of the vacuum chamber of this utility model;

[0025] Figure 5 This is a schematic diagram of the internal structure of the housing of this utility model;

[0026] Figure 6 This is a partial cross-sectional view of the gas distributor part of this utility model.

[0027] Drawing number explanation: 1. Housing; 2. Rotating mechanism; 3. Bearing plate; 4. Positioning groove; 5. Gas distributor; 6. Diversion chamber; 7. Nozzle; 8. Heating device; 9. Vacuum chamber; 10. Gas recovery structure; 11. Guide plate; 12. Servo motor; 13. Drive shaft; 14. Radiant heating tube; 15. Temperature sensor; 16. Recovery tube; 17. Filter box; 18. Air pump; 19. Outer sliding door; 20. Inner lifting door; 21. Sealing strip; 22. Positioning boss. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to the accompanying drawings. Example

[0029] Please see Figures 1-6 A mold protection nitriding coating device includes: a housing 1 and a vacuum chamber 9 disposed in the inner cavity of the housing 1, which forms a closed environment to prevent external impurities from interfering with the nitriding reaction; a rotating mechanism 2, which includes a horizontally rotatable support plate 3 with a mold positioning groove 4 on its surface, which makes each surface of the mold uniformly exposed to the nitriding gas through dynamic rotation and positioning bosses 22 in the positioning groove 4.

[0030] Gas distributor 5 extends downward from the top to the middle of vacuum chamber 9, and its end is connected to an annular flow divider 6. Multiple nitrogen gas nozzles 7 are evenly arranged around the circumference of the flow divider 6 to achieve multi-angle nitrogen coverage.

[0031] A heating device 8, which is connected to the vacuum chamber 9, is located on the side wall of the shell 1. The heating device 8 is integrated into the side wall of the shell 1 to precisely control the temperature of the vacuum chamber 9 to optimize the nitriding reaction conditions. A gas recovery structure 10 is located on the outside of the shell 1 to recover nitrogen gas.

[0032] The following describes some embodiments of this application in detail with reference to the accompanying drawings:

[0033] Please see Figures 1-6This invention drives the bearing plate 3 to rotate horizontally through the rotating mechanism 2, so that the mold can dynamically adjust its relative position with the nozzle 7 during the coating process. With the circumferentially evenly distributed nitriding gas nozzles 7 and the positioning bosses 22 set in the positioning groove 4, a flow channel is formed between the positioning groove 4 and the mold, which facilitates the entry of nitrogen gas. This effectively solves the problem of blind spots in the coverage caused by fixed-angle spraying on the bottom surface of the mold in the traditional process, and significantly improves the uniformity and integrity of the nitriding coating.

[0034] The gas distributor 5 is equipped with a spiral guide plate 11, which extends axially to form a continuous swirling channel. Its end is connected to the annular distribution cavity 6. The guide plate 11 forces the nitrogen gas to form a high-speed swirling flow before entering the annular distribution cavity 6. This design enhances the uniformity of gas mixing, reduces local concentration unevenness caused by laminar flow, and the swirling inertia helps the nitrogen gas to be sprayed more evenly from the nozzle 7, thereby improving coating efficiency.

[0035] In addition, the rotating mechanism 2 includes a drive shaft 13 that passes through the housing 1. The drive shaft 13 is rotatably connected to the housing 1 in a sealed manner. The lower end is connected to a servo motor 12, and the upper end is connected to a flange of the bearing plate 3. The servo motor 12 is fixed inside the housing 1. The precise control of the servo motor 12 enables the bearing plate 3 to rotate smoothly at a set speed, avoiding vibration that could cause mold displacement. The design of fixing the motor inside the housing 1 reduces vibration transmission and ensures system stability.

[0036] Furthermore, the heating device 8 includes radiant heating tubes 14 distributed around the vacuum chamber 9, the surface of which is covered with a silicon carbide protective layer. The inner wall of the vacuum chamber 9 is provided with a temperature sensor 15 that is signal-connected to the radiant heating tubes 14. The temperature sensor 15 monitors the temperature inside the vacuum chamber 9 in real time and feeds it back to the control system to dynamically adjust the heating power, so as to avoid local overheating or insufficient temperature and maintain the constant temperature environment required for the nitriding reaction.

[0037] Meanwhile, the nitriding gas nozzle 7 is tilted downwards, and its injection port adopts a tapered nozzle structure to form a high-speed focused airflow that precisely covers the mold surface. The tilt angle avoids direct gas impact on the mold, which could lead to uneven coating, while the tapered design enhances the gas flow rate and promotes the penetration reaction between nitrogen and the mold surface.

[0038] Meanwhile, the gas recovery structure 10 includes a recovery pipe 16 and a filter box 17. The recovery pipe 16 is connected to the gas recovery port at the bottom of the housing 1 and the air inlet of the air pump 18 at the top of the housing 1. The air pump 18 is connected to the gas distributor 5. The filter box 17 is fixed in the middle section of the recovery pipe 16 and has a metal filter, a ceramic particulate filter and an activated carbon adsorption layer arranged in sequence inside. The air pump 18 draws unreacted nitrogen into the recovery pipe 16. After being filtered through multiple layers in the filter box 17, the clean nitrogen is reintroduced into the gas distributor 5 for recycling, thereby reducing gas consumption and emissions.

[0039] It is worth noting that the front of the housing 1 is provided with a double-layer sealed door, including an outer sliding door 19 and an inner lifting door 20. A transition cavity is formed between the two doors. An expanded graphite sealing strip 21 is fixedly provided on the edge of the inner lifting door 20 to prevent the vacuum chamber 9 from being directly exposed to the atmosphere.

[0040] In this technical solution, the bottom and sides of the inner side of the positioning groove 4 are fixed with uniformly arranged positioning bosses 22. An air guide channel is formed between adjacent positioning bosses 22. The air guide channel formed between adjacent positioning bosses 22 allows nitrogen to flow along the bottom of the mold, eliminating the blind area of ​​bottom coating in the traditional process and ensuring full coverage of the coating.

[0041] Among them, the top of the positioning boss 22 is embedded with a high-temperature resistant ceramic pad. The high hardness and heat insulation of the ceramic material prevent the mold from directly contacting the metal boss and generating thermal stress or wear. At the same time, it can withstand the high temperature environment in the nitriding process and extend the service life of the device.

[0042] In this technical solution, the inner wall of the nozzle 7 is provided with a flow guide groove to further optimize the gas flow direction, reduce turbulence and guide nitrogen to form a laminar flow state, enhance the consistency of the spray direction, avoid waste caused by gas scattering, and improve the coating accuracy.

[0043] The operating principle of the device is explained below:

[0044] First, the operator opens the outer sliding door 19, places the mold on the bearing plate 3 of the rotating mechanism 2, and fixes the mold with the positioning boss 22 in the positioning groove 4 and the high-temperature resistant ceramic pad to ensure that the mold is aligned with the air guide channel. Then, the inner lifting door 20 is closed first, and the outer sliding door 19 is closed. The transition cavity between the two doors isolates the external air and maintains the airtightness of the vacuum chamber 9.

[0045] Connect the gas pump 18 to the external exhaust pipe, and use the gas pump 18 at the top of the housing 1 to draw air from the vacuum chamber 9. Combined with the gas recovery port at the bottom of the housing 1, a low-pressure environment is quickly established to avoid oxygen interfering with the nitriding reaction. Then, connect the gas pump 18 to the gas distributor 5 in a fixed manner.

[0046] When the circumferentially distributed radiant heating tubes 14 are activated, heat is evenly radiated to the vacuum chamber 9. The temperature sensor 15 on the inner wall of the vacuum chamber 9 feeds back data to the control system in real time, and the heating power is dynamically adjusted.

[0047] Servo motor 12 drives the bearing plate 3 to rotate horizontally at a constant speed via drive shaft 13. Nitrogen gas forms a swirling flow through the spiral guide plate 11 at the top of the gas distributor 5, enters the annular distribution chamber 6, and is then ejected by circumferentially evenly distributed nitriding gas nozzles 7. The nozzles 7 adopt a tapered nozzle and inner wall guide grooves to ensure that nitrogen gas accurately covers the mold surface at high speed and in a laminar flow state.

[0048] The mold rotates with the support plate 3, and the air guide channel at the bottom of the positioning groove 4 guides the gas to flow along the bottom surface of the mold, eliminating coating blind spots. At high temperature, nitrogen reacts chemically with the metal on the surface of the mold to form a uniform nitrided coating, which improves hardness and wear resistance until the coating is completed.

[0049] During this process, unreacted nitrogen gas is drawn from the top of the housing 1 into the recovery pipe 16 via the gas pump 18 and enters the filter box 17. The gas passes through the metal filter to intercept particulate matter, through the ceramic particle filter to adsorb dust, and through the activated carbon layer to remove harmful gases. The purified nitrogen gas is then reintroduced into the gas distributor 5 for recycling, reducing consumption and emissions.

[0050] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been shown and explained in the embodiments. Without departing from the principles, the implementation of the present invention may have any modifications or variations.

Claims

1. A mold protection nitriding coating device, characterized in that, include: The housing (1) and the vacuum chamber (9) disposed inside the housing (1); Rotating mechanism (2), the rotating mechanism (2) includes a horizontally rotatable support plate (3), the surface of which is provided with a mold positioning groove (4); Gas distributor (5) extends downward from the top to the middle of the vacuum chamber (9), and its end is connected to an annular flow divider (6), which is uniformly arranged with multiple nitriding gas nozzles (7) around its circumference. A heating device (8) connected to the vacuum chamber (9) is provided on the side wall of the housing (1); A gas recovery structure (10) is located on the outside of the shell (1) and is used to recover nitrogen.

2. The mold protection nitriding coating device according to claim 1, characterized in that: The gas distributor (5) is provided with a spiral guide plate (11) inside. The guide plate (11) extends axially and forms a continuous swirling channel. Its end is connected to the diversion cavity (6).

3. The mold protection nitriding coating device according to claim 1, characterized in that: The rotating mechanism (2) includes a drive shaft (13) that passes through the housing (1). The drive shaft (13) is rotatably connected to the housing (1) in a sealed manner. The lower end is connected to a servo motor (12), and the upper end is connected to the flange of the bearing plate (3). The servo motor (12) is fixed inside the housing (1).

4. The mold protection nitriding coating device according to claim 1, characterized in that: The heating device (8) includes radiant heating tubes (14) distributed circumferentially along the vacuum chamber (9), the surface of which is covered with a silicon carbide protective layer, and a temperature sensor (15) connected to the radiant heating tubes (14) is provided on the inner wall of the vacuum chamber (9).

5. The mold protection nitriding coating device according to claim 1, characterized in that: The nitriding gas nozzle (7) is tilted downwards, and its injection port adopts a tapered nozzle structure.

6. The mold protection nitriding coating device according to claim 1, characterized in that: The gas recovery structure (10) includes a recovery pipe (16) and a filter box (17). The recovery pipe (16) is connected to the gas recovery port provided at the bottom of the housing (1) and the air inlet of the air pump (18) provided at the top of the housing (1). The air pump (18) is connected to the gas distributor (5). The filter box (17) is fixed in the middle section of the recovery pipe (16) and has a metal filter, a ceramic particulate filter and an activated carbon adsorption layer arranged in sequence inside.

7. The mold protection nitriding coating device according to claim 1, characterized in that: The front side of the housing (1) is provided with a double-layer sealing door, including an outer sliding door (19) and an inner lifting door (20), with a transition cavity formed between the two doors. An expanded graphite sealing strip (21) is fixedly provided on the edge of the inner lifting door (20).

8. The mold protection nitriding coating device according to claim 1, characterized in that: The bottom and sides of the inner side of the positioning groove (4) are fixed with uniformly arranged positioning bosses (22), and an air guide channel is formed between adjacent positioning bosses (22).

9. A mold protection nitriding coating device according to claim 8, characterized in that: The nozzle (7) has a flow guide groove on its inner wall.

10. A mold protection nitriding coating device according to claim 8, characterized in that: The top of the positioning boss (22) is fitted with a high-temperature resistant ceramic pad.

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