False tooth continuous sintering rotary furnace

Abstract

The utility model relates to the technical field of high-temperature kilns, in particular to a denture continuous sintering rotary furnace. Comprising a furnace frame, a temperature-controllable tunnel furnace is arranged at the upper end of the furnace frame, five temperature zones with different temperatures are arranged in the tunnel furnace in the direction of a hearth, a rotary table is arranged on the furnace frame, the head end and the tail end of the rotary table are connected with an inlet and an outlet of the hearth of the tunnel furnace to form a concentric-square-shaped channel, push plates are arranged on the concentric-square-shaped channel at intervals, and a crucible is arranged on each push plate. And pushing devices are arranged at the four corners of the concentric-square-shaped channel correspondingly, and the pushing plates are turned at the corners of the concentric-square-shaped channel through the pushing devices. And through the pushing device, the multiple pushing plates move in the anticlockwise direction of the concentric-square-shaped channel, and rotation is formed. The whole process can be continuously carried out without repeatedly opening and closing the furnace door, the operation is simpler and more convenient, and the production efficiency is greatly improved; and the problem of resource waste caused by the fact that the temperature needs to be increased during next sintering when a furnace door of a traditional muffle furnace is frequently opened and closed is solved, and the production cost is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of high-temperature kilns, and in particular to a rotary kiln for continuous sintering of dentures. Background Art

[0002] Dentures are another name for false teeth. Removable dentures are generally made of titanium alloys, cobalt-chromium alloys, resin materials, pure titanium alloys, ceramics, etc. Dentures made of ceramic teeth, cobalt-chromium alloys and other materials need to be sintered at high temperatures in a sintering furnace. On the market, the box-type muffle furnace is widely used in the sintering process of porcelain teeth. When in use, the denture is placed on a crucible, and then the crucible is placed in the muffle furnace for sintering. However, this method can only perform sintering with one crucible at a time, which not only limits the production quantity and low production efficiency; but also requires opening and closing the furnace door after the denture is sintered. When taking out and placing the crucible, burns are likely to occur, and hot air leaks will occur. Subsequent sintering requires re-heating, resulting in a waste of resources.

[0003] To this end, the present application provides a denture continuous sintering rotary kiln that can perform continuous sintering and improve production efficiency. Utility Model Content

[0004] The purpose of this application is to solve the problems existing in the prior art and to propose a rotary kiln for continuous sintering of dentures.

[0005] In order to achieve the above objectives, this application adopts the following technical solutions:

[0006] A rotary furnace for continuous sintering of dentures comprises a furnace frame, a temperature-controllable tunnel furnace is provided at the upper end of the furnace frame, a plurality of temperature zones with different temperatures are provided in the tunnel furnace along the furnace direction, a turntable is provided on the furnace frame, the head and tail ends of the turntable are connected to the furnace inlet and outlet of the tunnel furnace to form a meandering channel, push plates are placed at intervals on the meandering channel, a crucible is placed on each push plate, and pushing devices are provided at the four corners of the meandering channel, which enable the push plates to change direction at the corners of the meandering channel through the pushing devices.

[0007] Preferably, the tunnel furnace comprises a corundum furnace chamber, a standard brick furnace body covering the corundum furnace chamber, and an outer shell covering the standard brick furnace body, and a heating component is provided in the furnace chamber.

[0008] Preferably, the tunnel furnace is divided into a high-temperature furnace and a low-temperature furnace which are connected to each other, and has four temperature zones, including two preheating zones in the low-temperature furnace, two sintering zones in the high-temperature furnace, and a cooling zone at the outlet of the high-temperature furnace.

[0009] Preferably, the furnace frame is provided with a thermal insulation cover, which covers the tunnel furnace and the rotary channel connected to the inlet and outlet of the tunnel furnace. A window for the crucible to pass through is provided on the thermal insulation cover, and an air hole is provided on the upper end of the thermal insulation cover.

[0010] Preferably, the pushing device includes a screw rotatably mounted on the turntable, the screw being driven by a motor, and a guide plate that is threadedly mounted on the screw and slides with the turntable.

[0011] Preferably, the pushing device is arranged in the turntable, and a pushing groove for the guide plate to pass through is provided on the end surface of the turntable.

[0012] Preferably, the long side direction of the turntable is composed of a plurality of rollers rotatably installed on the turntable at intervals.

[0013] Preferably, the push plate axis is provided with a sink groove and a cross groove for embedding the crucible, the end of the cross groove passes through the side wall of the push plate, and the depth of the cross groove is greater than the depth of the sink groove.

[0014] Preferably, the heating components are silicon-molybdenum rods, the cold ends of the silicon-molybdenum rods extend out of the shell, the hot ends extend into the furnace, and the silicon-molybdenum rods are arranged in rows on both sides along the length direction of the furnace.

[0015] Preferably, a plurality of Forma wheels are evenly distributed around the bottom end of the furnace frame.

[0016] Compared with the prior art, the present application provides a rotary kiln for continuous sintering of dentures, which has the following beneficial effects:

[0017] 1. During use, place the denture in the crucible, which is then placed on the push plates. The push mechanism causes the push plates to move counterclockwise along the meandering channel, creating a rotation. This process eliminates the need to repeatedly open and close the furnace door, allowing for continuous operation and significantly improving production efficiency. This process also avoids the resource waste associated with frequent door openings in traditional muffle furnaces, which require increasing the temperature for the next sintering cycle, thereby reducing production costs.

[0018] 2. There are four different temperature zones in the tunnel furnace. The crucible remains stationary for a certain period of time in each temperature zone to meet the sintering conditions of dentures made of different materials and achieve better sintering effects. This is equivalent to the single furnace temperature of a muffle furnace, which can greatly shorten the sintering waiting time.

[0019] 3. The entire production process is automatically controlled by PLC and runs automatically, which saves manpower and can achieve sintering all day without stopping, which can greatly improve production efficiency and output.

[0020] Other advantages, objectives and features of the present application will be described in part in the following description; and in part, will be apparent to those skilled in the art based on an examination of the following; or, may be taught from the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 These are the right-hand axis view and the left-hand axis view of this application.

[0022] Figure 2 This is a three-dimensional schematic diagram of the right-hand axial view of this application after removing the thermal insulation cover.

[0023] Figure 3 This is the front view of the application.

[0024] Figure 4 This is a biaxial view of the furnace frame 1 of the present application.

[0025] Figure 5 For this application Figure 3 Schematic diagram of the cross section at AA.

[0026] Figure 6 For this application Figure 3 Schematic diagram of the cross section at BB.

[0027] Figure 7 For this application Figure 3 Schematic diagram of the cross section at CC.

[0028] Figure 8 This is a bidirectional axis view of the tunnel furnace of this application.

[0029] Figure 9 This is a cross-sectional schematic diagram of the high-temperature furnace of this application.

[0030] Figure 10 This is a cross-sectional schematic diagram of the low-temperature furnace of this application.

[0031] Figure 11 This is a schematic diagram of the pushing device at the upper right corner of the circular channel of this application.

[0032] Figure 12 This is a schematic diagram of the pushing device at the lower right corner of the circular channel of this application.

[0033] Figure 13 This is a schematic diagram of the pushing device at the lower left corner of the circular channel of this application.

[0034] Figure 14 This is a schematic diagram of the pushing device at the upper left corner of the circular channel of this application.

[0035] Figure 15 This is a schematic diagram of the silicon-molybdenum rod clamping structure of this application.

[0036] Figure 16 This is a schematic diagram of the roller channel structure at the front long side of the meandering channel of this application.

[0037] Figure 17 This is a schematic diagram of the Foma wheel structure of this application.

[0038] Figure 18 This is a schematic diagram of the push plate structure of this application.

[0039] Figure 19 For this application Figure 2 Local schematic diagram of point D.

[0040] In the figure: 1. Furnace frame; 2. Control cabinet; 3. Turntable; 4. Tunnel furnace; 5. High-temperature furnace; 6. Low-temperature furnace; 7. Formazan wheel; 8. Push plate; 9. Crucible; 10. Insulation cover; 11. Roller; 12. Gear lever; 13. Fan; 14. Transformer; 15. Silicon-molybdenum rod; 16. Motor; 17. Lead screw; 18. Guide plate. DETAILED DESCRIPTION

[0041] The following is a combination of the appended examples of the present application Figure 1-19 , the technical solutions in the embodiments of the present application are described clearly and completely. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments.

[0042] Example 1. In order to solve the problems existing in the prior art, this embodiment provides a denture continuous sintering rotary furnace, including a furnace frame 1, a temperature-controllable tunnel furnace 4 is provided at the upper end of the furnace frame 1, and a plurality of temperature zones with different temperatures are provided along the furnace direction of the tunnel furnace 4. A turntable 3 is provided on the furnace frame 1, and the inlet and outlet of the turntable 3 are connected with the inlet and outlet of the furnace of the tunnel furnace 4 to form a meandering channel, and push plates 8 are placed at intervals on the meandering channel, and a crucible 9 is placed on each push plate 8. Pushing devices are provided at the four corners of the meandering channel, and the push plates 8 are changed at the corners of the meandering channel through the pushing devices.

[0043] Principle details of this embodiment:

[0044] A rotary furnace for continuous sintering of artificial teeth comprises a furnace frame 1. The furnace frame 1 is formed by splicing together high-temperature resistant, corrosion-resistant, high-strength metal plates and pipes fixed by bolts or welding.

[0045] The upper end of the furnace frame 1 is fastened with a long tunnel furnace 4 by bolts, and a through passage is provided in the middle of the tunnel furnace 4 as a furnace. The tunnel furnace 4 is provided with multiple temperature zones of different temperatures along the furnace direction, and the temperatures in the multiple temperature zones can be controlled.

[0046] A C-shaped turntable 3 is mounted on the furnace frame 1. The turntable's head end is connected to the furnace exit of the tunnel furnace 4, while its tail end is connected to the furnace entrance, forming a U-shaped serpentine passage. Push plates 8 are placed at intervals along the serpentine passage, each with a crucible 9 mounted thereon. Pushing devices are installed at each of the four corners of the serpentine passage, enabling the push plates 8 to change direction at these corners.

[0047] The push plate 8 is chamfered around its periphery, and the bottom wall of the furnace is in a sunken groove shape adapted to the push plate 8. Shift rods 12 are provided at intervals on the outer and inner edge surfaces of the turntable 3, and the shift rods 12 are detachably mounted on the turntable 3 via screws.

[0048] To the right of the furnace frame 1 lies a control cabinet 2, which includes, but is not limited to, a main unit, a PLC control system, and a control panel. The PLC control system is electrically connected to all pusher mechanisms, automatically controlling their alternating motion, ensuring that the pusher plate 8 moves in an orderly fashion along the meandering channel. The control panel allows the heating temperature within the tunnel furnace 4 to be adjusted to suit the sintering temperature of different denture materials. The operating efficiency of the pusher mechanisms can also be adjusted, thereby controlling the time the pusher plate 8 remains idle within the various temperature zones of the sintering furnace, thereby controlling the duration of sintering within each temperature zone.

[0049] According to the above technical solution:

[0050] During use, the shaped denture is placed in the crucible 9, and then the crucible 9 is placed on the push plate 8 in sequence. Through the pushing device, several push plates 8 are moved counterclockwise along the meandering channel. As the push plate 8 moves along the meandering channel, the crucible 9 enters the tunnel furnace 4 and remains stationary in each temperature zone for a certain period of time to meet the sintering conditions of dentures made of different materials and to achieve a better sintering effect of the denture. Then the crucible 9 leaves the tunnel furnace 4 from the furnace outlet of the tunnel furnace 4 along with the push plate 8, and after arriving at the material taking area of ​​the turntable 3, the denture can be taken out of the crucible 9. The entire process does not require repeated opening and closing of the furnace door. It can be carried out continuously and can achieve sintering without stopping all day. It is easier to operate and greatly improves production efficiency. It also avoids the problem of waste of resources caused by the need to increase the temperature during the next sintering when the traditional muffle furnace door is frequently opened and closed, thereby reducing production costs.

[0051] In this embodiment, a plurality of fans are evenly distributed in the furnace frame 1 below the tunnel furnace 4 to dissipate heat from the outer shell of the tunnel furnace 4 so that the temperature of the outer shell is not too high to burn people.

[0052] In a further embodiment of this solution, the tunnel furnace 4 comprises a corundum furnace chamber comprising a top plate, side plates, and a bottom plate, a standard brick furnace body enclosing the corundum furnace chamber, and an outer shell enclosing the standard brick furnace body. The furnace chamber is packaged layer by layer to form a heat-insulating and heat-retaining tunnel furnace 4. A heating assembly is provided within the furnace chamber to provide heat for the sintering operation.

[0053] Example 3, in a further embodiment of this solution, the tunnel furnace 4 is divided into a high-temperature furnace 5 and a low-temperature furnace 6, and the inlet of the high-temperature furnace 5 is the same as the outlet of the low-temperature furnace 6.

[0054] The low-temperature furnace 6 is equipped with heating elements, creating two preheating zones for preheating the dentures. The area near the exit of the high-temperature furnace 5 is also free of heating elements and serves as a cooling zone. Two sintering zones are also provided. Maintaining the dentures at different temperatures for a specified period of time allows for optimal sintering.

[0055] Example 4, a further embodiment of this solution, to further lock in hot air and prevent burns, a thermal insulation cover 10 is installed on the furnace frame 1. This covers the tunnel furnace 4 and the rotary channel connecting the inlet and outlet of the tunnel furnace 4, thereby isolating the tunnel furnace 4. A window is provided on the thermal insulation cover 10 for the crucible 9 to pass through without affecting its passage. An air hole is provided at the top of the thermal insulation cover 10 to enable hot air convection and pressure regulation.

[0056] In a further embodiment of this solution, the pushing device includes a screw 17 rotatably mounted on the turntable 3. The screw 17 is driven by a motor 16. A guide plate 18 is threadedly mounted on the screw 17 and slidably engages with the turntable 3. When the motor 16 is activated, the motor 16 drives the screw 17 to rotate, which in turn drives the guide plate 18 to move, thereby pushing the push plate 8. The screw 17 is arranged perpendicular to the direction of entry of the push plate 8, thereby enabling the push plate 8 to change direction at the four corner bends of the circular channel.

[0057] In this embodiment, the lead screw 17 can be either a unidirectional or bidirectional screw. With a unidirectional screw 17, the motor 16 must rotate forward and reverse to control the pushing and resetting of the guide plate 18. Furthermore, travel sensors are provided on the grate 1 at both ends of the guide plate 18's travel, electrically connected to the PLC control system to control the autonomous activation and travel of the pushing mechanism. With a bidirectional screw 17, the motor 16 only needs to rotate in one direction to achieve reciprocating movement of the guide plate 18. Furthermore, in this embodiment, the adjacent pushing mechanism will only activate pushing after the guide plate 18 of that pushing mechanism has been reset, thus preventing misalignment.

[0058] In this embodiment, the four pushing devices may have the same structure or different structures; the motor 16 may be directly connected to the lead screw 17 or connected to the lead screw 17 via a gear set.

[0059] The meandering channel is a meandering structure with a long side and a short side. The long side is parallel to the length direction of the furnace frame 1 (the furnace direction of the tunnel furnace 4), and the short side is perpendicular to the tunnel furnace 4. If there are too many push plates 8 in the meandering channel, then push plates 8 are also distributed in the short sides of the meandering channel. Then, it is possible that part of the crucible 9 on the push plate 8 is heated inside the heat-insulating cover 10 and the other part is outside the heat-insulating cover 10, resulting in a temperature difference in the denture and affecting the yield. Therefore, in this embodiment, the maximum number of push plates 8 meets the following requirements: not more than the two long sides of the meandering channel, as shown in the attached figure. Figure 5As shown. And it must also satisfy the following: the push plate 8 only stays on the long side of the meandering channel during transportation, that is, the push plate 8 at the end of the long side of the meandering channel is pushed to the other end of the long side by the pushing device. That is: the pushing device at the upper right corner of the meandering channel pushes the push plate 8 into the furnace. The pushing device at the upper left corner of the meandering channel moves the push plate 8 moved out of the furnace to the other long side of the meandering channel. The pushing device at the lower left corner of the meandering channel moves the push plate 8 toward the long side of the insulation cover 10 leaking out of the meandering channel. The pushing device at the lower right corner of the meandering channel moves the push plate 8 on the long side of the insulation cover 10 leaking out of the meandering channel toward the furnace entrance.

[0060] In a further embodiment of this solution, for the sake of aesthetics, the turntable 3 is hollow, the pusher is disposed within the furnace frame 1, and a push slot is provided on the end surface of the turntable 3 for the guide plate 18 to pass through. This allows the pusher to be concealed, improving the aesthetics of the device.

[0061] Embodiment 7, in a further embodiment of this solution, the longitudinal direction of the turntable 3 is composed of a plurality of rollers 11 rotatably mounted on the turntable 3 at intervals. This reduces the friction of the push plate 8, making the push plate 8 move more easily.

[0062] In Example 8, a further embodiment of this solution, the push plate 8 is provided with a trough and a cross groove at its axis for embedding the crucible 9. The end of the cross groove extends through the side wall of the push plate 8, and the depth of the cross groove is greater than the trough. The trough is used to embed the crucible 9 and restrain it, preventing it from slipping and falling during the movement of the push plate 8. The presence of the cross groove not only provides a gripping gap for removing the crucible 9 from the trough, but also allows hot air to flow more comprehensively around the crucible 9, resulting in more even heating of the denture.

[0063] Example 9, a further embodiment of the present solution, in this embodiment, a specific heating component device is provided: the heating component is a silicon-molybdenum rod 15, and the silicon-molybdenum rod 15 is a resistive heating element. In this embodiment, the silicon-molybdenum rod 15 is U-shaped, and the two ends of the silicon-molybdenum rod 15 are cold ends and pass through the furnace body. The cold ends of the silicon-molybdenum rod 15 are clamped on the end face of the outer shell by asbestos chucks. The two connecting parts at the two ends of the silicon-molybdenum rod 15 are inserted into the furnace as hot ends. A transformer 14 is provided on the cabinet at the lower end of the furnace frame 1, and the temperature is controlled by changing the voltage of the heating component through the transformer 14. And the silicon-molybdenum rods 15 are arranged in rows on both sides along the length direction of the furnace. The push plate 8 moves between the two rows of silicon-molybdenum rods 15 in the furnace to make the heating more balanced.

[0064] Example 10, in a further embodiment of this solution, a plurality of Forma wheels 7 are evenly distributed around the bottom end of the furnace frame 1. Figure 17As shown, the Forma wheel 7, also known as the Forma caster or leveling wheel, is a multifunctional caster that combines mobility and fixation. The Forma wheel 7 can be used to push the grate 1 for transfer. After it is transferred to the designated area, the Forma wheel 7 extends its legs, separating the wheels from the ground, thereby stably placing the grate 1 on the ground.

[0065] The above is only a preferred specific implementation method of the present application, but the scope of protection of the present application is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes based on the technical solution and application concept of the present application within the technical scope disclosed in the present application, and they should be covered by the scope of protection of the present application.

[0066] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0067] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A rotary kiln for continuous sintering of dentures, characterized in that: The invention comprises a furnace frame (1), wherein a temperature-controllable tunnel furnace (4) is provided at the upper end of the furnace frame (1), and a plurality of temperature zones with different temperatures are provided in the tunnel furnace (4) along the furnace direction. A turntable (3) is provided on the furnace frame (1), and the head and tail ends of the turntable (3) are connected to the furnace inlet and outlet of the tunnel furnace (4) to form a circular channel, and push plates (8) are placed at intervals on the circular channel, and a crucible (9) is placed on each push plate (8). The four corners of the circular channel are provided with a pushing device, and the pushing device causes the push plate (8) to change direction at the corner of the circular channel.

2. The continuous sintering rotary kiln for dentures according to claim 1, characterized in that: The tunnel furnace (4) comprises a corundum furnace chamber, a standard brick furnace body covering the corundum furnace chamber, and an outer shell covering the standard brick furnace body, and a heating component is provided in the furnace chamber.

3. The continuous sintering rotary kiln for artificial teeth according to claim 1, characterized in that: The tunnel furnace (4) is divided into a high-temperature furnace (5) and a low-temperature furnace (6) that are connected to each other. Four temperature zones are provided, including two preheating zones arranged in the low-temperature furnace (6), two sintering zones in the high-temperature furnace (5), and a cooling zone at the outlet of the high-temperature furnace (5).

4. The continuous sintering rotary kiln for artificial teeth according to claim 1, characterized in that: The furnace frame (1) is provided with a heat-insulating cover (10) for covering the tunnel furnace (4) and the rotary channel portion connected to the inlet and outlet of the tunnel furnace (4). A window for the crucible (9) to pass through is provided on the heat-insulating cover (10), and an air hole is provided at the upper end of the heat-insulating cover (10).

5. The continuous sintering rotary kiln for artificial teeth according to claim 1, characterized in that: The pushing device includes a screw (17) rotatably mounted on the turntable (3), the screw (17) is driven by a motor (16), and a guide plate (18) is threadedly mounted on the screw (17) and is in sliding engagement with the turntable (3).

6. The continuous sintering rotary kiln for artificial teeth according to claim 5, characterized in that: The pushing device is arranged in the turntable (3), and a pushing groove for the guide plate (18) to pass through is provided on the end surface of the turntable (3).

7. The continuous sintering rotary kiln for artificial teeth according to claim 1, characterized in that: The long side direction of the turntable (3) is composed of a plurality of rollers (11) which are rotatably mounted on the turntable (3) at intervals.

8. The continuous sintering rotary kiln for artificial teeth according to claim 1, characterized in that: The axis of the push plate (8) is provided with a sink groove and a cross groove for embedding the crucible (9), the end of the cross groove passes through the side wall of the push plate (8), and the depth of the cross groove is greater than the depth of the sink groove.

9. The continuous sintering rotary kiln for artificial teeth according to claim 2, characterized in that: The heating components are silicon molybdenum rods (15), the cold ends of the silicon molybdenum rods (15) extend out of the housing, the hot ends extend into the furnace, and the silicon molybdenum rods (15) are arranged in rows on both sides along the length direction of the furnace.

10. The continuous sintering rotary kiln for artificial teeth according to claim 1, characterized in that: A plurality of Forma wheels (7) are evenly distributed around the bottom end of the furnace frame (1).

Images