Porcelain baking furnace for denture production

Abstract

The utility model relates to porcelain stove technical field discloses a porcelain stove for false tooth production, including support, the support side wall is provided with control panel, the support side wall fixedly connected with hearth, the support inside slide connection has the tray, the tray side wall is provided with and places subassembly, the support back is provided with the purification subassembly, the placing subassembly includes a plurality of rotary disc and the clamp cover, each rotary disc bottom all rotatory connection on the tray upper surface, the clamp cover side wall slide connection is in the rotary disc interior, the tray bottom fixedly connected with the fixed frame, the fixed frame side wall fixedly connected with motor no.

Description

Technical Field

[0001] This utility model relates to the field of porcelain furnace technology, and in particular to a porcelain furnace for denture production. Background Technology

[0002] In the field of dental restoration, the production quality of dentures directly affects the patient's experience and the restorative effect. The porcelain furnace, as the core equipment for denture sintering and molding, plays a decisive role in the strength, color consistency, and structural stability of the dentures. With the increasing demand for dental care, denture production is gradually moving towards mass production and high precision. This requires porcelain furnaces not only to meet basic high-temperature sintering functions but also to have multi-station simultaneous processing capabilities to improve production efficiency. Simultaneously, it must ensure that the denture blanks at each station remain stable and heated evenly during the sintering process, avoiding the scrapping of finished dentures due to process defects. Therefore, higher requirements are placed on the load-bearing and fixing structure and temperature uniformity control of the porcelain furnace.

[0003] Currently, most mainstream porcelain furnaces used for denture production employ a single or fixed multi-station tray design for their load-bearing structure. These trays typically only have simple slots or positioning protrusions for placing the denture blanks, lacking dedicated elastic clamping mechanisms. Regarding temperature uniformity control, they primarily rely on the distribution of heating elements within the furnace chamber to achieve heat diffusion. While some equipment attempts to improve the temperature field by adjusting heating power, it does not actively and dynamically adjust the temperature of the denture blanks. The underlying technology involves heating the furnace chamber to a preset sintering temperature using electric heating elements. Thermal radiation and convection are used to homogenize the temperature within the furnace chamber, allowing the porcelain powder on the tray to melt and bond. Throughout the sintering process, the denture blank remains stationary, relying on the furnace chamber's own temperature distribution for heating.

[0004] However, the existing porcelain furnace design and technical solutions have obvious defects: due to the lack of effective clamping and fixation, the denture blank is prone to displacement during sintering, resulting in changes in the relative position of the denture blank and the heating element; at the same time, the statically placed denture blank cannot avoid the influence of local temperature field differences in the furnace, which can easily lead to over-sintering in some areas and under-sintering in others, ultimately resulting in uneven color and substandard strength of the finished dentures, which seriously affects the restorative effect and service life of the dentures. This problem has become a key factor restricting the quality and pass rate of denture production. Therefore, a porcelain furnace for denture production is proposed to solve the above problems. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a porcelain furnace for denture production, which aims to improve the problems of denture displacement and uneven heating during sintering in the existing porcelain furnace.

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

[0007] A porcelain furnace for denture production includes a support frame, a control panel on the side wall of the support frame, a furnace chamber fixedly connected to the side wall of the support frame, a tray slidably connected inside the support frame, a placement component on the side wall of the tray, and a purification component on the back of the support frame.

[0008] The placement assembly includes multiple rotating disks and a clamp. The bottom of each rotating disk is rotatably connected to the upper surface of the tray. The sidewall of the clamp is slidably connected to the inside of the rotating disk. A fixing frame is fixedly connected to the bottom of the tray. A second motor is fixedly connected to the sidewall of the fixing frame. A first gear is fixedly connected to the output end of the second motor. A rotating rod is fixedly connected to the bottom of each rotating disk. The sidewall of each rotating rod is rotatably connected to the inside of the tray. A second gear is fixedly connected to the sidewall of each rotating rod. Each second gear meshes with the first gear.

[0009] As a further description of the above technical solution:

[0010] The purification assembly includes a purification box and multiple filters. The side wall of the purification box is fixedly connected to the back of the bracket, and the side walls of the multiple filters are slidably connected inside the purification box. The multiple filters are, from bottom to top, a coarse filtration layer, a fine filtration layer, and a final treatment layer. An exhaust pipe is fixedly connected to the top of the purification box.

[0011] As a further description of the above technical solution:

[0012] A motor is fixedly connected to the top of the bracket, and a screw is fixedly connected to the output end of the motor. The side wall of the screw is rotatably connected to the inside of the bracket, and the inner wall of the tray is threadedly connected to the side wall of the screw.

[0013] As a further description of the above technical solution:

[0014] Each of the rotating disks has a slider fixedly connected inside, and the bottom of the sleeve is fixedly connected to the upper surface of the slider. Each of the rotating disks is provided with a spring, one end of which is fixedly connected to the inside of the rotating disk, and the other end of which is fixedly connected to the side wall of the slider.

[0015] As a further description of the above technical solution:

[0016] A fan is fixedly connected to the back of the bracket, and a connecting pipe is fixedly connected to the air inlet end of the fan.

[0017] As a further description of the above technical solution:

[0018] One end of the connecting pipe is fixedly connected to the top of the furnace, and a one-way air valve is fixedly connected to the side wall of the end of the connecting pipe away from the blower. The air outlet of the blower is fixedly connected inside the purification box.

[0019] As a further description of the above technical solution:

[0020] A door panel is rotatably connected to the side wall of the purification chamber, and the side wall of the door panel is in contact with the side wall of the purification chamber.

[0021] As a further description of the above technical solution:

[0022] A sealing gasket is fixedly connected to the side wall of the door panel, and the side wall of the sealing gasket is slidably connected to the inside of the purification box.

[0023] This utility model has the following beneficial effects:

[0024] 1. In this utility model, the motor drives the gear to rotate, and the gear meshes with the gear on the rotating rod at the bottom of each rotating disk to rotate synchronously. At the same time, the clamping sleeve clamps the denture blank by the elastic force generated by the slider and the spring, thereby achieving the effect of synchronous rotation and stable sintering of dentures in multiple positions. This solves the problems of dentures being easy to shift and unevenly heated during the sintering of existing porcelain furnaces. The above structure improves the consistency of denture sintering and the quality of finished products.

[0025] 2. In this utility model, the fan is started via the control panel. The fan draws the exhaust gas from the top of the furnace through the connecting pipe and sends the exhaust gas into the purification box. After being filtered by three layers of filters inside the box, the exhaust gas is discharged from the exhaust pipe in compliance with standards. At the same time, the filter can be easily replaced by opening the door panel, thereby achieving the effect of efficient collection, purification and discharge of porcelain furnace exhaust gas and convenient filter maintenance. This solves the problems of easy leakage of exhaust gas, incomplete purification and cumbersome filter replacement in existing porcelain furnaces. The above structure improves the environmental friendliness of the denture production process and the convenience of equipment maintenance. Attached Figure Description

[0026] Figure 1 This is a three-dimensional schematic diagram of a porcelain furnace for denture production according to the present invention;

[0027] Figure 2 This is a schematic diagram of the support structure of a porcelain furnace for denture production proposed in this utility model;

[0028] Figure 3 This is a schematic diagram of the structure of a porcelain furnace tray for denture production according to the present invention.

[0029] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0030] Figure 5This is a schematic diagram of the back of the support frame of a porcelain furnace for denture production according to the present invention;

[0031] Figure 6 This is a schematic diagram of the purification chamber of a porcelain furnace for denture production proposed in this utility model.

[0032] Legend:

[0033] 1. Bracket; 2. Control panel; 3. Furnace chamber; 4. Tray; 5. Motor 1; 6. Screw; 7. Rotary disc; 8. Jacket; 9. Slider; 10. Spring; 11. Fixing frame; 12. Gear 1; 13. Motor 2; 14. Gear 2; 15. Rotating rod; 16. Purification box; 17. Fan; 18. Connecting pipe; 19. One-way air valve; 20. Exhaust pipe; 21. Door panel; 22. Sealing gasket; 23. Filter screen. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0035] Reference Figures 1-4 This utility model provides an embodiment of a porcelain furnace for denture production, including a support 1. A control panel 2 is provided on the side wall of the support 1. The control panel 2 is used to preset parameters such as porcelain firing temperature, time, and rotation speed, and at the same time displays the equipment operating status in real time, such as the temperature of the furnace chamber 3 and the working status of the motor, so as to realize intelligent control of the equipment. The furnace chamber 3 is fixedly connected to the side wall of the support 1. The furnace chamber 3 is composed of a high-purity alumina ceramic liner and an aluminum silicate fiber cotton insulation layer. The liner can withstand high temperatures of 1200-1600℃, and the insulation layer can effectively reduce heat loss and provide a stable high-temperature environment for denture sintering. A tray 4 is slidably connected inside the support 1. The tray 4 is made of Inconel 600 high-temperature resistant alloy and is used to support the denture blank to be sintered. A placement component is provided on the side wall of the tray 4, and a purification component is provided on the back of the support 1.

[0036] The placement assembly includes multiple rotating disks 7 and clamps 8. Each rotating disk 7 is rotatably connected to the upper surface of the tray 4 at its bottom. The rotating disks 7 are made of modified polytetrafluoroethylene (PTFE), which is heat-resistant and has a low coefficient of friction. They are used to place the denture blank and rotate it. Each clamp 8 has its sidewall slidably connected to the inside of the rotating disk 7. A high-temperature resistant silicone pad is attached to the inner side of the clamp 8 for direct contact and clamping of the denture blank, preventing damage to the blank surface during clamping. A fixing frame 11 is fixedly connected to the bottom of the tray 4, and a second motor 13 (Panasonic A6 model) is fixedly connected to the sidewall of the fixing frame 11. A series of stepper motors are used to provide rotational power. The output end of motor 2 13 is fixedly connected to gear 1 12. Each rotating disk 7 is fixedly connected to the bottom of a rotating rod 15. The rotating rod 15 is made of stainless steel. The side wall of each rotating rod 15 is rotatably connected to the inside of the tray 4. Each rotating rod 15 is fixedly connected to gear 2 14. Each gear 2 14 meshes with gear 1 12. Through the meshing of gear 1 12 and multiple gears 2 14, in conjunction with the power output of motor 2 13, all rotating disks 7 are driven to rotate synchronously, achieving the effect of uniform heating of the multi-station denture blank.

[0037] A motor 5 is fixedly connected to the top of the bracket 1. The motor 5 is a Mitsubishi MR-J4 series servo motor. A screw 6 is fixedly connected to the output end of the motor 5. The screw 6 is used to convert the rotational motion of the motor 5 into the linear motion of the tray 4. The side wall of the screw 6 is rotatably connected to the inside of the bracket 1. The inner wall of the tray 4 is threadedly connected to the side wall of the screw 6. The motor 5 drives the screw 6 to rotate. With the threaded connection between the tray 4 and the screw 6, the tray 4 is driven to slide up and down along the inside of the bracket 1. This achieves the effect of automatically controlling the entry and exit of the denture blank into and out of the furnace chamber 3 and reducing manual operation.

[0038] Each rotating disk 7 has a slider 9 fixedly connected inside, and the bottom of the clamp 8 is fixedly connected to the upper surface of the slider 9. Each rotating disk 7 is equipped with a spring 10, which is made of GH4169 high-temperature resistant alloy. The compression amount can be adaptively adjusted according to the size of the denture blank to provide clamping force. One end of the spring 10 is fixedly connected inside the rotating disk 7, and the other end of the spring 10 is fixedly connected to the side wall of the slider 9. The clamp 8 and the spring 10 are connected through the slider 9. With the sliding of the clamp 8 in the rotating disk 7, the clamp 8 can adaptively clamp denture blanks of different sizes, thus preventing the denture blank from shifting during the sintering process.

[0039] Reference Figure 5 and Figure 6The purification assembly includes a purification box 16 and multiple filters 23. The purification box 16 provides a sealed space for the purification of exhaust gas to prevent exhaust gas leakage. The side wall of the purification box 16 is fixedly connected to the back of the bracket 1. The side walls of the multiple filters 23 are slidably connected to the inside of the purification box 16. The outer side of the filters 23 is equipped with a plastic sliding rail frame. The sliding connection structure facilitates quick pull-out replacement. The multiple filters 23 are, from bottom to top, a coarse filter layer, a fine filter layer, and a final treatment layer. The coarse filter layer is a stainless steel perforated mesh with a pore size of 2mm and a mesh count of 10, which is used to intercept larger ceramic powder blocks and metal debris in the exhaust gas. The fine filter layer is a HEPA high-efficiency filter, which is used to remove fine dust particles. The final treatment layer is a columnar activated carbon filter, which is used to adsorb volatile organic compounds and odors. An exhaust pipe 20 is fixedly connected to the top of the purification box 16. The exhaust pipe 20 is used to exhaust the purified and qualified exhaust gas to the outside to avoid air pollution in the workshop.

[0040] A fan 17 is fixedly connected to the back of bracket 1. Fan 17 is a Jiuzhou Puhui 4-72-4.5A centrifugal fan, used to provide power for exhaust gas extraction and transportation, ensuring the flow rate of exhaust gas within the purification system. A connecting pipe 18, a high-temperature resistant silicone hose, is fixedly connected to the air inlet of fan 17. This hose connects the furnace 3 to fan 17, facilitating exhaust gas transmission. One end of the connecting pipe 18 is fixedly connected to the top of the furnace 3. The top of the furnace 3 is a naturally rising and accumulating area for hot exhaust gas; this connection position improves exhaust gas collection efficiency and reduces [waste gas]. The exhaust gas remains in the furnace 3. A one-way valve 19 is fixedly connected to the side wall of the connecting pipe 18 away from the blower 17. The one-way valve 19 is a butterfly one-way valve, which is used to prevent the unpurified exhaust gas in the purification box 16 from flowing back into the furnace 3 when the blower 17 stops, so as to avoid polluting the sintering environment. The air outlet of the blower 17 is fixedly connected to the inside of the purification box 16. The exhaust gas is driven from the furnace 3 through the connecting pipe 18 into the purification box 16 by the blower 17. With the anti-backflow function of the one-way valve 19, the directional and efficient transportation of exhaust gas is achieved, which achieves the effect of avoiding exhaust gas leakage and backflow.

[0041] A door panel 21, made of stainless steel, is rotatably connected to the side wall of the purification chamber 16. The rotating structure facilitates opening the purification chamber 16 to replace the filter 23. The side wall of the door panel 21 fits snugly against the side wall of the purification chamber 16. A sealing gasket 22, made of high-temperature resistant nitrile rubber, is fixedly connected to the side wall of the door panel 21 to fill the gap between the door panel 21 and the purification chamber 16. The side wall of the sealing gasket 22 is slidably connected inside the purification chamber 16. Through the cooperation of the door panel 21 and the sealing gasket 22, the purification chamber 16 is sealed when the door panel 21 is closed, preventing exhaust gas from leaking through the gaps in the door panel 21 and ensuring the purification effect. Simultaneously, the rotating door panel 21, combined with the sliding of the filter 23, allows for quick replacement of the filter 23, improving the convenience of equipment maintenance.

[0042] Working principle: During operation, the operator first places the baking tray containing the denture to be sintered onto the rotating disk 7 on the upper surface of the tray 4. The clamp 8 is then pushed to slide along the inside of the rotating disk 7. The bottom of the clamp 8 is connected to the inner wall of the rotating disk 7 via a slider 9. During sliding, the spring 10 inside the rotating disk 7 is compressed, generating a counter-force that causes the clamp 8 to tightly hold the baking tray, preventing displacement during sintering. Next, the control panel 2 starts motor 5, and the screw 6 rotates, causing the tray 4 to rise until the tray 4 and the fixed denture blank are completely inside the furnace 3. 5. Stop, the furnace chamber 3 is closed and begins to heat up to the sintering temperature according to the preset program. In order to ensure that all parts of the denture are heated evenly, the control panel 2 starts the motor 13 on the side wall of the bottom fixing frame 11 of the tray 4. The output end of the motor 13 drives the gear 12 to rotate. Since the side wall of the rotating rod 15 at the bottom of each rotating disk 7 is fixed with the gear 14, and the gear 14 meshes with the gear 12, the rotation of the gear 12 synchronously drives all the gears 14 to rotate. In turn, the rotating rod 15 drives the rotating disk 7 and the denture blank fixed above to rotate, so as to realize the synchronous and uniform sintering of the multi-station denture.

[0043] During the sintering of dentures in furnace 3, waste gas containing metal oxide dust and volatile organic compounds is generated. At this time, the control panel 2 activates the fan 17 on the back of the bracket 1. The fan 17 draws the waste gas from the furnace 3 through the connecting pipe 18 at the air inlet end. One end of the connecting pipe 18 is fixed to the top of the furnace 3, and the end of the connecting pipe 18 away from the fan 17 is equipped with a one-way air valve 19 to prevent the waste gas from flowing back into the furnace 3 and affecting the sintering environment. The fan 17 sends the collected waste gas into the purification box 16 through the air outlet end. The waste gas flows upward from the bottom of the purification box 16. The exhaust gas passes through three layers of filters 23 that are slidably connected inside the purification chamber 16. The bottom layer of the three filters 23 is a coarse filter layer that intercepts large particulate impurities in the exhaust gas, the middle layer is a fine filter layer that removes fine dust, and the top layer is a final treatment layer that adsorbs volatile organic compounds and odors. The purified exhaust gas is discharged through the exhaust pipe 20 at the top of the purification chamber 16 in compliance with standards. If the filter 23 needs to be replaced, the door panel 21 that is rotatably connected to the side wall of the purification chamber 16 can be opened. The sealing gasket 22 on the side wall of the door panel 21 can ensure that the purification chamber 16 is sealed to prevent exhaust gas leakage. The old filter 23 can be pulled out and replaced with a new filter 23.

[0044] Once the porcelain firing process is complete, the furnace chamber 3 cools down to a safe temperature. The control panel 2 controls motor 5 to run in reverse, causing tray 4 to descend to its initial position. The operator then releases the clamp 8 and removes the sintered denture.

Claims

1. A porcelain furnace for denture production, comprising a support frame (1), characterized in that: The support (1) has a control panel (2) on its side wall, a furnace (3) is fixedly connected to the side wall of the support (1), a tray (4) is slidably connected inside the support (1), a placement component is provided on the side wall of the tray (4), and a purification component is provided on the back of the support (1). The placement assembly includes multiple rotating disks (7) and a sleeve (8). The bottom of each rotating disk (7) is rotatably connected to the upper surface of the tray (4). The side wall of the sleeve (8) is slidably connected to the inside of the rotating disk (7). A fixing frame (11) is fixedly connected to the bottom of the tray (4). A second motor (13) is fixedly connected to the side wall of the fixing frame (11). A first gear (12) is fixedly connected to the output end of the second motor (13). A rotating rod (15) is fixedly connected to the bottom of each rotating disk (7). The side wall of each rotating rod (15) is rotatably connected to the inside of the tray (4). A second gear (14) is fixedly connected to the side wall of each rotating rod (15). Each second gear (14) meshes with the first gear (12).

2. The porcelain furnace for denture production according to claim 1, characterized in that: The purification assembly includes a purification box (16) and multiple filters (23). The side wall of the purification box (16) is fixedly connected to the back of the bracket (1). The side walls of the multiple filters (23) are slidably connected inside the purification box (16). The multiple filters (23) are, from bottom to top, a coarse filtration layer, a fine filtration layer, and a final treatment layer. An exhaust pipe (20) is fixedly connected to the top of the purification box (16).

3. The porcelain furnace for denture production according to claim 1, characterized in that: A motor (5) is fixedly connected to the top of the bracket (1), and a screw (6) is fixedly connected to the output end of the motor (5). The side wall of the screw (6) is rotatably connected to the inside of the bracket (1), and the inner wall of the tray (4) is threadedly connected to the side wall of the screw (6).

4. The porcelain furnace for denture production according to claim 1, characterized in that: Each of the rotating disks (7) is fixedly connected to a slider (9), and the bottom of the sleeve (8) is fixedly connected to the upper surface of the slider (9). Each of the rotating disks (7) is provided with a spring (10), one end of the spring (10) is fixedly connected to the inside of the rotating disk (7), and the other end of the spring (10) is fixedly connected to the side wall of the slider (9).

5. A porcelain furnace for denture production according to claim 2, characterized in that: A fan (17) is fixedly connected to the back of the bracket (1), and a connecting pipe (18) is fixedly connected to the air inlet end of the fan (17).

6. A porcelain furnace for denture production according to claim 5, characterized in that: One end of the connecting pipe (18) is fixedly connected to the top of the furnace (3), and a one-way air valve (19) is fixedly connected to the side wall of the end of the connecting pipe (18) away from the fan (17). The air outlet end of the fan (17) is fixedly connected inside the purification box (16).

7. A porcelain furnace for denture production according to claim 2, characterized in that: The side wall of the purification box (16) is rotatably connected to a door panel (21), and the side wall of the door panel (21) is in contact with the side wall of the purification box (16).

8. A porcelain furnace for denture production according to claim 7, characterized in that: A sealing gasket (22) is fixedly connected to the side wall of the door panel (21), and the side wall of the sealing gasket (22) is slidably connected to the inside of the purification box (16).

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