A sintering kiln for special ceramics production

Abstract

This invention discloses a sintering kiln for special ceramic production, relating to the technical field of ceramic sintering. The kiln includes at least one sintering channel inside. Heating elements are longitudinally distributed and fixed to the kiln wall. Motors are symmetrically distributed along the kiln and fixed to the kiln. A first connecting shaft is fixed to the output shaft of one motor, and a second connecting shaft is fixed to the output shaft of the other motor. At least one feed belt connects the first and second connecting shafts via pulleys. At least one guide belt connects the first and second connecting shafts via pulleys. This invention generates rotational torque through the friction between the guide belt and the ceramic blank, causing the ceramic blank to rotate while moving backward. This achieves uniform heating during the sintering process, reduces the risk of cracking due to temperature differences, and improves product yield.

Description

Technical Field

[0001] This invention relates to the technical field of ceramic sintering, and more particularly to a sintering kiln for the production of special ceramics. Background Technology

[0002] In the sintering process of special ceramics, the ceramic green body needs to undergo high-temperature heating to achieve densification and structural shaping. Currently, commonly used electric kilns typically install the heat source inside or around the kiln wall, heating through radiation and convection. However, during the continuous feeding and sintering of ceramic green bodies, there is a significant temperature difference between the side furthest from the heat source and the side closest to the kiln wall. This leads to uneven heating of the ceramic green body, easily generating internal stress during sintering, which in turn causes defects such as cracking and deformation, affecting the product yield and performance consistency.

[0003] To address these issues, some kiln equipment attempts have tried to improve temperature uniformity by optimizing the heating layout or adding insulation zones. However, these methods have limited effectiveness in the dynamic sintering process with continuous feeding. Especially on automated production lines, when ceramic blanks move within the kiln, their fixed posture makes it difficult to achieve multi-angle heating, further exacerbating localized overheating or underheating, thus limiting improvements in product quality and production efficiency.

[0004] Therefore, this invention proposes a sintering kiln for the production of special ceramics. Summary of the Invention

[0005] In order to overcome the shortcomings of uneven heating of ceramic blanks, which easily leads to cracking and deformation, this invention provides a sintering kiln for special ceramic production.

[0006] A sintering kiln for special ceramics production includes a kiln with at least one sintering channel inside. Heating elements are longitudinally distributed and fixed to the kiln wall. Motors are symmetrically distributed along the kiln and fixed to the kiln. A first connecting shaft is fixed to the output shaft of one motor, and a second connecting shaft is fixed to the output shaft of the other motor. At least one feed belt is connected between the first and second connecting shafts via pulleys. A pulley on the feed belt near the first connecting shaft rotates synchronously with the first connecting shaft. At least one guide belt is connected between the first and second connecting shafts via pulleys. A pulley on the guide belt near the second connecting shaft rotates synchronously with the second connecting shaft. The feed belt and guide belt are adjacent and in contact with each other. Ceramic placement racks are placed on adjacent feed belts and guide belts. Each ceramic placement rack has multiple holes, and a rotating placement disc is rotatably connected to the bottom of each hole. A blocking bar is provided on the kiln wall near the inlet in each sintering channel, with the bottom of the blocking bar higher than the top of the ceramic placement rack when placed horizontally.

[0007] In a preferred embodiment of the present invention, the propulsion belt is provided with equally spaced protrusions.

[0008] In a preferred embodiment of the present invention, the first connecting shaft is connected to a pulley on the feed belt near the first connecting shaft by a key, and the second connecting shaft is connected to a pulley on the guide belt near the second connecting shaft by a key.

[0009] In a preferred embodiment of the present invention, both the propulsion belt and the guide belt are made of anti-slip material.

[0010] In a preferred embodiment of the present invention, a fixed guide rail is fixedly connected to the side of the kiln wall near the blocking rod in each sintering channel of the kiln. The blocking rod is rotatably connected to the kiln. A gear is fixedly connected to the upper part of the blocking rod. A rack frame is slidably connected to the fixed guide rail in the vertical direction. The gear meshes with the adjacent rack frame. A moving channel is provided between the blocking rod and the guide belt to allow the ceramic placement rack to pass through.

[0011] In a preferred embodiment of the present invention, the bottom surface of the blocking rod and the top surface of the ceramic placement rack are both coated with a smooth material.

[0012] In a preferred embodiment of the present invention, a plurality of grid frames are fixedly connected to the upper inner side of the kiln, and at least one discharge pipe is connected to the top outer side of the kiln. The exhaust gas generated during sintering passes upward through the grid frames and is then discharged from the discharge pipe.

[0013] The beneficial effects are as follows: This invention generates rotational torque through the friction between the guide belt and the ceramic blank, so that the ceramic blank rotates while moving backward, thereby achieving uniform heating during the sintering process, reducing the risk of cracking caused by temperature difference, and improving product yield.

[0014] This invention utilizes a linkage structure between a blocking rod and a rack to automatically intercept and reset an inclined ceramic placement rack, ensuring that it is placed horizontally before entering the sintering channel, thus guaranteeing effective contact between the ceramic blank and the guide belt and improving heating uniformity. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0016] Figure 2 This is a three-dimensional structural cross-sectional view of the first perspective of the present invention.

[0017] Figure 3 This is a three-dimensional structural cross-sectional view of the second perspective of the present invention.

[0018] Figure 4 This is a three-dimensional structural diagram of the ceramic placement rack and rotating placement plate of the present invention.

[0019] Figure 5 This is a three-dimensional structural diagram of the propulsion belt and guide belt components of the present invention.

[0020] Figure 6 This is a separate diagram of the first connecting shaft, the second connecting shaft, the propulsion belt, and the guide belt of the present invention.

[0021] Figure 7 This is a three-dimensional structural diagram of the components of the present invention, including the blocking rod, the fixed guide rail, and the rack frame.

[0022] Figure 8 This is a three-dimensional structural diagram of the components of the present invention, such as the blocking rod, the fixed guide rail, and the gear.

[0023] Figure 9 This is a three-dimensional structural diagram of the kiln, grid frame, and discharge pipe components of the present invention.

[0024] The components in the diagram are labeled as follows: 101_Kiln, 102_Sintering Channel, 103_Heating Component, 104_Ceramic Placement Rack, 105_Rotating Placement Disc, 106_Motor, 107_First Connecting Shaft, 108_Second Connecting Shaft, 109_Propeller Belt, 110_Guide Belt, 201_Blocking Bar, 202_Fixed Guide Rail, 203_Gear, 204_Rack and Pinion Frame, 205_Moving Channel, 301_Grid Frame, 302_Discharge Pipe. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Example 1: A sintering kiln for special ceramics production, such as Figures 1-6As shown, the system includes a kiln 101, with two sintering channels 102 arranged inside the kiln 101. Two heating elements 103 are fixedly connected to the kiln walls on both the left and right sides of the kiln 101. Motors 106 are symmetrically distributed along the left and right sides of the kiln 101, with the output shaft of the front motor 106 fixedly connected to a first connecting shaft 107 and the output shaft of the rear motor 106 fixedly connected to a second connecting shaft 108. Two feed belts 109 are connected between the first connecting shaft 107 and the second connecting shaft 108 within the same sintering channel 102 via pulleys. The second connecting shaft 108 is rotatably connected to the rear pulley on the feed belt 109, and the first connecting shaft 107 is connected to the front pulley on the feed belt 109 via a key, so that the pulley on the feed belt 109 closest to the first connecting shaft 107 rotates synchronously with the first connecting shaft 107. Multiple equally spaced... The cloth has protrusions, and the spacing between each protrusion is greater than the front and rear length of the ceramic placement rack 104, thus forming a placement groove for placing and moving the ceramic placement rack 104. The first connecting shaft 107 and the second connecting shaft 108 in the same sintering channel 102 are connected by pulleys to two guide belts 110. Both the push belt 109 and the guide belt 110 are made of anti-slip material. The first connecting shaft 107 is rotatably connected to the pulley on the front side of the guide belt 110, and the second connecting shaft 108 is connected to the pulley on the rear side of the guide belt 110 by a key, so that the pulley on the rear side of the guide belt 110 rotates synchronously with the second connecting shaft 108. The push belt 109 and the guide belt 110 are alternately distributed and adjacent to each other. The ceramic placement rack 104 is placed on the adjacent push belt 109 and guide belt 110. The ceramic placement rack 104 has six holes, and a rotating placement disk 105 is rotatably connected to the bottom of each hole.

[0027] First, the motor 106 is started. The output shaft of the front motor 106 drives the feed belt 109 backward through the first connecting shaft 107. At the same time, the output shaft of the rear motor 106 drives the guide belt 110 forward through the second connecting shaft 108. Next, the ceramic blank is placed in the holes of the ceramic placement rack 104. Then, the ceramic placement rack 104 is placed in the placement groove of the feed belt 109 at the front entrance of the sintering channel 102. At the same time, the other part of the bottom of the ceramic placement rack 104 presses on the guide belt 110. The feed belt 109 pushes the ceramic placement rack 104 backward through the sintering channel 102 through the protrusions. The heating element 103 enters the sintering channel. The ceramic blank in 102 is sintered. During this process, since the guide belt 110 moves in the opposite direction to the ceramic blank and the position of the guide belt 110 in contact with the ceramic blank is deviated from the center of mass of the ceramic blank, the friction generated by the contact surface of the guide belt 110 will generate a torque, causing the ceramic blank to rotate while moving backward, thereby driving the ceramic blank to rotate. During this process, the high temperature gas in the sintering channel 102 enters the gap between the ceramic placement rack 104 and the ceramic blank, heating the ceramic part placed between the upper part of the rotating placement plate 105 and the lower part of the ceramic placement rack 104. In this way, the ceramic blank can be heated evenly during the sintering process, reducing the risk of ceramic cracking.

[0028] Example 2: Based on Example 1, such as Figure 7 and Figure 8 As shown, each sintering channel 102 of the kiln 101 has a blocking rod 201 rotatably connected to the front side of the kiln wall. The bottom of the blocking rod 201 is higher than the top of the ceramic placement rack 104 when it is placed horizontally. The bottom surface of the blocking rod 201 and the top surface of the ceramic placement rack 104 are coated with a smooth material. Each sintering channel 102 of the kiln 101 has a fixed guide rail 202 fixedly connected to the front side of the kiln wall. A gear 203 is fixedly connected to the upper part of the blocking rod 201. The fixed guide rail 202 is slidably connected to a rack frame 204 in the vertical direction. The gear 203 is connected to the adjacent rack frame 204. In the initial engagement state, the bottom plane of the rack 204 is greater than or equal to the top position of the placement frame 104. During use, when the blocking rod 201 is raised, it pushes the bottom plane of the rack 204 to a position lower than the height of the ceramic placement frame 104, thereby preventing the ceramic placement frame 104 from moving. A moving channel 205 is provided between the blocking rod 201 and the guide belt 110 to allow the ceramic placement frame 104 to pass through. The height of the moving channel 205 is greater than the height of the protrusion of the push belt 109 and the height of the ceramic placement frame 104 when it is placed horizontally.

[0029] When placing the ceramic placement rack 104, if the ceramic placement rack 104 is placed horizontally in the placement groove between two adjacent protrusions of the push belt 109, the ceramic placement rack 104 will be pushed backward from under the stop bar 201 by the top protrusion of the push belt 109.

[0030] When the rear side of the bottom of the ceramic placement rack 104 is placed on the protrusion of the feed belt 109, the ceramic placement rack 104 will be pressed against the top of the protrusion of the feed belt 109. The ceramic placement rack 104 will tilt forward and downward, causing the rear side of the ceramic placement rack 104 to be abnormally raised. This will result in the rear side of the ceramic placement rack 104 being higher than the height of the moving channel 205. During the backward movement of the ceramic placement rack 104, it will be directly blocked by the blocking rod 201 and stop moving. Since the protrusion of the feed belt 109 is located at the bottom of the ceramic placement rack 104, it is impossible to effectively apply a pushing force to the ceramic placement rack 104. This will cause the protrusion of the feed belt 109 to move backward alone until the feed belt 109 disengages from the bottom of the ceramic placement rack 104, allowing the ceramic placement rack 104 to enter the placement groove of the feed belt 109 located at the front. Only then will the ceramic placement rack 104 automatically straighten to a horizontal position and be pushed backward through the sintering channel 102.

[0031] If the front side of the bottom of the ceramic placement rack 104 rests on the protrusion of the feed belt 109, causing the ceramic placement rack 104 to tilt forward and upward, the top of the ceramic placement rack 104 forms an inclined surface with an increasing angle from back to front and upward. Since the rear end of the ceramic placement rack 104 is lower than the height of the moving channel 205, the rear end of the ceramic placement rack 104 enters the moving channel 205 first. However, as the ceramic placement rack 104 moves, the top of the ceramic placement rack 104 tilts, causing the front height of the ceramic placement rack 104 entering the sintering channel 102 to gradually exceed the height of the moving channel 205. During the backward movement, it will pass through the tilt of its top... The inclined plane gradually pushes up the blocking rod 201 to rotate upward. The blocking rod 201 then drives the rack frame 204 to slide downward along the fixed guide rail 202 through the gear 203. This causes the ceramic placement rack 104 to be blocked by the rack frame 204 during its backward movement and pause its movement until the feed belt 109 conveys it backward separately to the bottom of the protrusion that disengages from the ceramic placement rack 104 and re-enters the placement slot located in front of the feed belt 109. Only then will the ceramic placement rack 104 automatically straighten to a horizontal position. The blocking rod 201 swings downward under the influence of gravity, thereby driving the rack frame 204 to lift upward and no longer block the ceramic placement rack 104. Subsequently, the ceramic placement rack 104 is pushed backward through the sintering channel 102.

[0032] In this way, the ceramic placement rack 104 can be automatically adjusted to a horizontal position before entering the sintering channel 102, thereby ensuring that the ceramic blank can fully contact the guide belt 110 during the sintering process, thus maximizing the stability of the ceramic blank in the kiln 101 and ensuring uniform heating of the ceramic blank.

[0033] Example 3: Based on Example 2, such as Figure 9As shown, six grid frames 301 are fixedly connected to the upper inner side of the kiln 101, and two exhaust pipes 302 are connected to the top outer side of the kiln 101. The exhaust gas generated during sintering passes upward through the grid frames 301 and is then discharged from the exhaust pipes 302.

[0034] The above embodiments are provided for those skilled in the art to implement or use the present invention. Those skilled in the art can make various modifications or changes to the above embodiments without departing from the inventive concept of the present invention. Therefore, the protection scope of the present invention is not limited to the above embodiments, but should be the maximum scope that conforms to the innovative features mentioned in the claims.

Claims

1. A sintering kiln for special ceramic production, comprising a kiln (101), at least one sintering channel (102) provided inside the kiln (101), longitudinally distributed heating elements (103) fixedly connected to the furnace wall of the kiln (101), motors (106) symmetrically distributed along the kiln (101) fixedly connected to the kiln (101), a first connecting shaft (107) fixedly connected to the output shaft of one side of the motor (106), a second connecting shaft (108) fixedly connected to the output shaft of the other side of the motor (106), and at least one feed belt (109) connected between the first connecting shaft (107) and the second connecting shaft (108) via a pulley. Its features are, The pulley on the side of the push belt (109) near the first connecting shaft (107) rotates synchronously with the first connecting shaft (107). At least one guide belt (110) is connected between the first connecting shaft (107) and the second connecting shaft (108) by a pulley. The pulley on the side of the guide belt (110) near the second connecting shaft (108) rotates synchronously with the second connecting shaft (108). The push belt (109) and the guide belt (110) are adjacent and in contact with each other. A ceramic placement rack (104) is placed on the adjacent push belt (109) and the guide belt (110). The ceramic placement rack (104) has multiple holes. A rotating placement disk (105) is rotatably connected to the bottom of each hole. The push belt (109) and the guide belt (110) have opposite transmission directions. A blocking bar (201) is provided on the side of the kiln wall near the entrance in each sintering channel (102) of the kiln (101). The bottom of the blocking bar (201) is higher than the top of the ceramic placement rack (104) when it is placed horizontally.

2. A sintering kiln for special ceramics production according to claim 1, characterized in that, The propulsion belt (109) is provided with equally spaced protrusions.

3. A sintering kiln for special ceramics production according to claim 2, characterized in that, The first connecting shaft (107) is connected to the pulley on the side of the feed belt (109) near the first connecting shaft (107) by a key, and the second connecting shaft (108) is connected to the pulley on the side of the guide belt (110) near the second connecting shaft (108) by a key.

4. A sintering kiln for special ceramics production according to claim 3, characterized in that, Both the propulsion belt (109) and the guide belt (110) are made of anti-slip material.

5. A sintering kiln for special ceramics production according to claim 4, characterized in that, A fixed guide rail (202) is fixedly connected to the side of the kiln wall near the blocking rod (201) in each sintering channel (102) of the kiln (101). The blocking rod (201) is rotatably connected to the kiln (101). A gear (203) is fixedly connected to the upper part of the blocking rod (201). A rack frame (204) is slidably connected to the fixed guide rail (202) in the vertical direction. The gear (203) meshes with the adjacent rack frame (204). A moving channel (205) is provided between the blocking rod (201) and the guide belt (110) to allow the ceramic placement rack (104) to pass through.

6. A sintering kiln for special ceramics production according to claim 5, characterized in that, The bottom surface of the blocking bar (201) and the top surface of the ceramic mounting rack (104) are coated with a smooth material.

7. A sintering kiln for special ceramics production according to claim 6, characterized in that, Multiple grid frames (301) are fixed to the upper inner side of the kiln (101), and at least one discharge pipe (302) is connected to the top outer side of the kiln (101). The exhaust gas generated during sintering passes upward through the grid frames (301) and is then discharged from the discharge pipe (302).

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