Sintering atmosphere control device for silicon carbide ceramic product

Abstract

The utility model provides a silicon carbide ceramic product sintering atmosphere control device. A moving device comprises guide rails symmetrically arranged on the side face of a furnace body. The movable island platform is mounted between the two guide rails through a first guide groove; the transmission island platform is arranged in the movable island platform; the inner teeth are arranged on the inner wall of the transmission island platform; and the driving gear is arranged in a space defined by the movable island platform and is meshed with the inner teeth at the same time. According to the silicon carbide ceramic product sintering atmosphere control device, the corresponding moving device is arranged, the driving gear is meshed with the inner teeth arranged on the inner wall of the transmission island table, the transmission island table is driven by rotation of the driving gear to move in the axis direction of the furnace body, and then the transmission island table drives the moving island table to move in the axis direction of the furnace body; a to-be-sintered product placed on the movable island platform sequentially passes through the first sintering chamber, the second sintering chamber and the cooling chamber, and after product sintering is completed, the driving gear rotates reversely to enable the transmission island platform and the movable island platform to reset.

Description

Technical Field

[0001] The utility model relates to the technical field of sintering furnaces, in particular to a sintering atmosphere control device for silicon carbide ceramic products. Background Art

[0002] The operating principle of a silicon carbide sintering furnace typically involves intermittent resistance heating or induction heating. Under high temperature conditions, the silicon carbide raw material is mixed with an appropriate amount of additives, pre-pressed, dried, and then placed in the furnace for reactive sintering. Inside the furnace, the silicon carbide raw material and additives chemically react to form silicon carbide crystals, which then form a dense structure with other amorphous materials.

[0003] During the sintering process of silicon carbide ceramic products, temperature control, one of the atmosphere factors, is particularly important. When the heating rate does not match the preparation speed of silicon carbide ceramic products, the products are prone to become porous or cracked.

[0004] Prior art discloses an invention patent entitled "A High-Temperature Sintering Furnace for Smelting Porous Silicon Carbide Ceramics," with publication number CN115507646A. This invention utilizes a moving device to control the sintering position of the product to be sintered. Specifically, the moving device comprises a push plate that pushes a gear plate connected thereto in a direction opposite to the direction of travel of the product to be sintered. This in turn drives a rotating wheel meshed with the gear plate, which in turn drives a supporting rod meshed with the rotating wheel in a direction aligned with the direction of travel of the product to be sintered, allowing the product to sequentially pass through a first sintering chamber, a second sintering chamber, and a cooling chamber.

[0005] However, the gear plate in the patent application specification is pushed by a push plate, and the two are not connected. After sintering is completed, the support block cannot be reset by the push plate, and manual reset is relatively difficult. At the same time, the moving device composed of the gear plate, the rotating wheel and the support rod, during the movement of the product to be sintered, because the support rod is only supported by the part meshing with the rotating wheel, the gear plate and the rotating wheel are also only supported by the part meshing with the two. The single-point support method can easily cause the support block of the load-bearing ceramic product to shake, and accelerate the wear of the rotating wheel and the gear plate, reducing the durability of the moving device. Utility Model Content

[0006] The purpose of the utility model is to solve the problem in the prior art that the supporting block cannot realize automatic reset and the single-point support method accelerates the wear of the rotating wheel and the gear plate, thereby reducing the durability of the mobile device.

[0007] In order to achieve the above-mentioned purpose, the present application proposes a sintering atmosphere control device for silicon carbide ceramic products, comprising: a furnace body; two partitions arranged inside the furnace body; wherein the two partitions divide the furnace body into a first sintering chamber, a second sintering chamber and a cooling chamber respectively; a heating tube arranged inside the first sintering chamber and the second sintering chamber; a cooler arranged inside the cooling chamber; a moving device and a phase changing device that pass through the first sintering chamber, the second sintering chamber and the cooling chamber are arranged inside the furnace body; wherein the moving device comprises: guide rails symmetrically arranged on the side of the furnace body; a moving island installed between the two guide rails through a first guide groove; a transmission island arranged inside the moving island; internal teeth arranged on the inner wall of the transmission island; and a driving gear arranged in the space enclosed by the moving island and meshing with the internal teeth at the same time.

[0008] The sintering atmosphere control device for silicon carbide ceramic products of the present application is provided by setting a corresponding moving device, wherein a driving gear is provided inside a transmission island, and the transmission island is provided inside the movable island. The driving gear is engaged with the internal teeth provided on the inner wall of the transmission island, and the rotation of the driving gear drives the transmission island to move along the axis of the furnace body, and then the transmission island drives the movable island to move along the axis of the furnace body, so that the product to be sintered placed on the movable island passes through the first sintering chamber, the second sintering chamber and the cooling chamber in turn. After the product sintering is completed, the driving gear is reversed to reset the transmission island and the movable island, thereby solving the problem in the prior art that the support block cannot be reset by the push plate.

[0009] As an improvement to the above-mentioned transmission island platform of the present application, in order to enable the transmission island platform to drive the mobile island platform to move a sufficient distance along the direction of the furnace body and pass through the first sintering chamber, the second sintering chamber and the cooling chamber in sequence, the transmission island platform includes: a straight line portion that is consistent with the axis direction of the furnace body and is symmetrically arranged, and an arc portion connecting the ends of the two straight line portions, wherein when the mobile island platform is close to the end face of the first sintering chamber away from the second sintering chamber, the driving gear is engaged with the internal teeth of the straight line portion at one end close to the cooling chamber.

[0010] As an improvement of the above-mentioned phase changing device of the present application, in order to limit the movement trajectory of the transmission island through the phase changing device, and then change the positional relationship between the transmission island and the driving gear, so that the transmission island drives the mobile island to move, the phase changing device includes: a second guide groove arranged at the bottom of the mobile island and arranged in the same plane as the axis of the furnace body; a support platform passing through the second guide groove and connected to the midpoint of the bottom of the transmission island; a limit plate arranged on the walls on both sides of the support platform; a slide groove arranged inside the limit plate; a baffle arranged inside the slide groove and having the same center and shape as the slide groove and smaller in size than the slide groove; and a guide rod engaged with the channel formed by the slide groove and the baffle.

[0011] Furthermore, in order to ensure that the motion trajectory of the guide rod in the slide groove is consistent with the motion trajectory of the driving gear in the internal teeth, the geometric center of the limiting plate is collinear with the geometric center of the furnace body.

[0012] Furthermore, in order to enable the phase changing device to drive the transmission island to move a sufficient distance so that the mobile island can drive the products to be sintered to pass through the first sintering chamber, the second sintering chamber and the cooling chamber in sequence, the maximum length of the chute is equal to the farthest distance between the inner walls of the transmission island.

[0013] Furthermore, in order to ensure that the phase changing device can effectively change the positional relationship between the transmission island and the driving gear, when the driving gear is close to the inner teeth at the end of the straight portion at the top of the transmission island, the straight portion at the bottom of the transmission island is close to the inner end surface of the bottom of the movable island.

[0014] The beneficial effects of this application are:

[0015] 1. The sintering atmosphere control device for silicon carbide ceramic products of the present application is provided by setting a corresponding moving device, wherein a driving gear is provided inside the transmission island, and the transmission island is provided inside the movable island. The driving gear is engaged with the internal teeth provided on the inner wall of the transmission island, and the rotation of the driving gear drives the transmission island to move along the axis of the furnace body, and then the transmission island drives the movable island to move along the axis of the furnace body, so that the product to be sintered placed on the movable island passes through the first sintering chamber, the second sintering chamber and the cooling chamber in turn. After the product is sintered, the driving gear is reversed to reset the transmission island and the movable island, which solves the problem in the prior art that the support block cannot be reset by the push plate.

[0016] 2. The silicon carbide ceramic product to be sintered in the present application is placed on a movable island, which is installed between two symmetrically arranged guide rails, so that the silicon carbide ceramic product to be sintered can be more stable when passing through the first sintering chamber, the second sintering chamber and the cooling chamber in sequence. At the same time, the movable island installed on the guide rail can avoid the problem that the gear plate and the rotating wheel in the traditional mobile device are supported only by the meshing part between the two. The single-point support method can easily cause the support block of the load-bearing ceramic product to shake, and accelerate the wear of the rotating wheel and the gear plate, thereby reducing the durability of the mobile device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 This is a schematic structural diagram of a sintering atmosphere control device for silicon carbide ceramic products according to an embodiment of the present application;

[0019] Figure 2This is a schematic diagram of the structure of a mobile device in an embodiment of the present application;

[0020] Figure 3 This is a schematic structural diagram of the phase-changing device in an embodiment of the present application;

[0021] Description of reference numerals:

[0022] 1. Furnace body;

[0023] 2. Partition;

[0024] 3. The first sintering chamber;

[0025] 4. Second sintering chamber;

[0026] 5. Cooling room;

[0027] 6. Heating tube;

[0028] 7. Cooler;

[0029] 8. Moving device; 81. Guide rail; 82. First guide groove; 83. Moving island; 84. Transmission island; 841. Straight portion; 842. Arc portion; 85. Internal teeth; 86. Driving gear;

[0030] 9. Phase-changing device; 91. Second guide groove; 92. Support platform; 93. Limit plate; 94. Slide groove; 95. Baffle; 96. Guide rod. DETAILED DESCRIPTION

[0031] The following will be combined with the Figures 1 to 3 The embodiments of the technical solution of the present application are described in detail. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application. In addition, the technical features involved in the various embodiments of the present application described below may be combined with each other as long as they do not conflict with each other.

[0032] Example 1:

[0033] Please refer to Figure 1 and 2In one embodiment of the present application, a moving device is provided to effectively solve the problem in the prior art that the supporting block cannot be automatically reset. Specifically, the moving device includes guide rails 81 symmetrically arranged on the side of the furnace body 1, and a moving island 83 installed between the two guide rails 81 through a first guide groove 82. A transmission island 84 is provided inside the moving island 83, and an inner tooth 85 is provided on the inner wall of the transmission island 84. A driving gear 86 meshing with the inner tooth 85 is provided in the space enclosed by the transmission island 84. When the driving gear 86 rotates, it engages with the inner tooth 85 on the inner wall of the transmission island 84, driving the transmission island 84 to move along the axis of the furnace body 1. Since the transmission island 84 is connected to the moving island 83, the movement of the transmission island 84 will directly drive the moving island 83 and the product to be sintered placed thereon to move together, passing through the first sintering chamber 3, the second sintering chamber 4 and the cooling chamber 5 in sequence. When sintering is complete, the drive gear 86 rotates in reverse, returning the transmission island 84 and the movable island 83 to their initial positions, automatically resetting the sintered product. Furthermore, since the movable island 83 is mounted between two symmetrically arranged guide rails 81, this structural design ensures smoother movement of the sintered product, avoiding rack vibration caused by single-point support.

[0034] Example 2:

[0035] Please refer to Figure 2 In one embodiment of the present application, the present application further optimizes the mobile device to enhance its durability and load-bearing capacity. Specifically, the transmission island 84 is designed to include a straight portion 841 symmetrically arranged along the axis of the furnace body 1 and a circular arc portion 842 connecting the ends of the two straight portions 841. When the mobile island 83 is in close contact with the end surface of the first sintering chamber 3 facing away from the second sintering chamber 4, the drive gear 86 engages with the internal teeth 85 of the straight portion 841 near the cooling chamber 5. During the rotation of the drive gear 86, the weight of the transmission island causes the drive gear 86 to tightly engage with the internal teeth 85. This design enables the transmission island 84 to maintain stable contact and support when driving the mobile island 83, avoiding wear and damage that may be caused by single-point support. At the same time, due to the rational structural design of the transmission island 84 and the mobile island 83, the load-bearing capacity of the entire mobile device is significantly improved, and it can stably support and move heavier products to be sintered.

[0036] Example 3:

[0037] Please refer to Figures 1 to 3In one embodiment of the present application, in order to ensure that the mobile device can move accurately according to the predetermined path, the present application also provides a phase-changing device 9. The phase-changing device 9 includes a second guide groove 91 arranged at the bottom of the movable island 83 and arranged in the same plane as the axis of the furnace body 1, a support platform 92 passing through the second guide groove 91 and connected to the midpoint of the bottom of the transmission island 84, and a limit plate 93 provided on the two side walls of the support platform 92. A slide groove 94 is provided inside the limit plate 93, and a baffle 95 is provided inside the slide groove 94 that is concentric with the slide groove 94 and has the same shape as the slide groove 94 and is smaller in size than the slide groove 94. The guide rod 96, which is engaged with the channel formed by the slide groove 94 and the baffle 95, is used to limit the movement trajectory of the transmission island 84.

[0038] Specifically, when the driving gear 86 rotates, the transmission island 84 can move smoothly along the predetermined path through the meshing action of the internal teeth 85 and the transmission island 84 and the guiding action of the phase-changing device 9. When the mobile island 83 in the moving device 8 is in close contact with the end face of the first sintering chamber 3 away from the partition 2, the driving gear 86 meshes with the end of the straight portion 841 on the side close to the cooling chamber 5. At this time, the guide rod 96 is at one end of the straight portion of the chute 94 away from the cooling chamber 5. At the same time, when the driving gear 86 meshes with the straight portion 841 at the top, the guide rod 96 is at the bottom end of the chute 94. When the driving gear 86 meshes with the straight portion 841 at the bottom, the guide rod 96 is at the bottom end of the chute 94. At the top of the chute 94, the motor is started to drive the driving gear 86 to rotate, and the transmission island 84 is driven by the internal gear 85 to gradually move along the axis of the furnace body toward the cooling chamber 5, thereby driving the mobile island 83 to move in the same direction. Optionally, a guide rail is provided between the transmission island 84 and the mobile island 83, or a device can be provided to limit the movement of the transmission island 84 relative to the mobile island 83 along the contour line of the mobile island 83, so that the transmission island 84 drives the mobile island 83 to move linearly between the guide rails 81.

[0039] Furthermore, when the driving gear 86 moves to the other end of the straight portion 841 opposite to the initial position, the guide rod 96 also moves to the other end of the straight portion 841 opposite to the initial position inside the slide groove 94. At this time, the driving gear 86 continues to rotate, so that the driving gear 86 begins to engage with the internal teeth located at the arc portion 842. At the same time, the guide rod 96 also begins to move along the arc inside the slide groove 94, and gradually moves to the end of the other straight portion opposite to the initial position. At this time, the driving gear 86 passes through the arc portion 842 to the end of the other straight portion 841, so that the transmission island 84 changes its relative position between the top and bottom of the movable island 83, from top to bottom, or bottom to top, so that the movable island 83 passes through the first sintering chamber 3, the second sintering chamber 4 and the cooling chamber 5 in sequence, completing the change of the temperature atmosphere of the silicon carbide ceramic product to be sintered.

[0040] Optionally, the rotation speed of the driving gear 86 can be changed by connecting the motor to a reducer, thereby changing the travel speed of the transmission island 84 and the movable island 83 in the furnace body, thereby controlling the time required for the sintering process.

[0041] Furthermore, by changing the position of the partition 2 relative to the furnace body 1 , the sizes of the first sintering chamber 3 , the second sintering chamber 4 and the cooling chamber 5 along the axis of the furnace body 1 can be limited, thereby controlling the time required for the sintering process.

[0042] Furthermore, when the product is sintered, the drive gear 86 is activated to continue rotating, driving the transmission island 84 in the direction opposite to the sintering process path, which in turn drives the movable island 83 in the same direction, ultimately resetting the movable device 8. This design not only improves the accuracy of the movable device but also ensures the stability and consistency of the product during the sintering process. Furthermore, the presence of the phase-changing device 9 makes the entire movable device structure more compact and stable, further improving its durability and service life.

[0043] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "upper", "lower", "inside" and "outside" are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the embodiments of the present application.

[0044] In the description of the embodiments of this application, unless otherwise specified or limited, technical terms such as "disposed," "equipped with," "connected," and "installed" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integrated connections; they can be directly connected or indirectly connected through an intermediate medium. Those skilled in the art will understand the specific meanings of these terms in the embodiments of this application based on specific circumstances.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A sintering atmosphere control device for silicon carbide ceramic products, comprising: A furnace body (1); two partitions (2) arranged inside the furnace body (1); wherein the two partitions (2) respectively divide the furnace body (1) into a first sintering chamber (3), a second sintering chamber (4) and a cooling chamber (5); a heating tube (6) arranged inside the first sintering chamber (3) and the second sintering chamber (4); a cooler (7) arranged inside the cooling chamber (5); wherein a moving tube (6) is arranged inside the furnace body (1) and passes through the first sintering chamber (3), the second sintering chamber (4) and the cooling chamber (5); A moving device (8) and a phase-changing device (9); wherein the moving device (8) comprises: guide rails (81) symmetrically arranged on the side of the furnace body (1); a moving island (83) installed between the two guide rails (81) through a first guide groove (82); a transmission island (84) arranged inside the moving island (83); internal teeth (85) arranged on the inner wall of the transmission island (84); and a driving gear (86) arranged in the space surrounded by the transmission island (84) and meshing with the internal teeth (85).

2. The sintering atmosphere control device for silicon carbide ceramic products according to claim 1, characterized in that: The transmission island (84) includes: a straight portion (841) that is symmetrically arranged and aligned with the axis of the furnace body (1) and an arc portion (842) connecting the ends of the two straight portions (841), wherein when the movable island (83) is in close contact with the end face of the first sintering chamber (3) facing away from the second sintering chamber (4), the driving gear (86) engages with the inner teeth (85) of the straight portion (841) at one end close to the cooling chamber (5).

3. The sintering atmosphere control device for silicon carbide ceramic products according to claim 1, characterized in that: The phase changing device (9) comprises: a second guide groove (91) provided at the bottom of the movable island (83) and arranged in the same plane as the axis of the furnace body (1); a support platform (92) passing through the second guide groove (91) and connected to the midpoint of the bottom of the transmission island (84); a limit plate (93) provided on the walls on both sides of the support platform (92); a slide groove (94) provided inside the limit plate (93); a baffle (95) provided inside the slide groove (94) and having the same center and shape as the slide groove (94) and smaller in size than the slide groove (94); and a guide rod (96) engaged with a channel formed by the slide groove (94) and the baffle (95).

4. The sintering atmosphere control device for silicon carbide ceramic products according to claim 3, characterized in that: The geometric center of the limiting plate (93) is collinear with the geometric center of the furnace body (1).

5. The sintering atmosphere control device for silicon carbide ceramic products according to claim 3, characterized in that: The maximum length of the chute (94) is equal to the maximum distance between the inner walls of the transmission island (84).

6. The sintering atmosphere control device for silicon carbide ceramic products according to claim 1 or 3, characterized in that: When the driving gear (86) is in close contact with the inner teeth (85) at the end of the straight portion (841) at the top of the transmission island (84), the straight portion (841) at the bottom of the transmission island (84) is in close contact with the inner end surface of the bottom of the movable island (83).

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