Sintered stone hot bending furnace and sintered stone hot bending method

Abstract

The present invention belongs to the technical field of sintered stone processing, and discloses a sintered stone hot bending furnace and a sintered stone hot bending processing method. The sintered stone hot bending furnace includes a furnace cover configured as an insulating plate, the insulating plate having a gas passage communicating with the furnace chamber, a blower unit installed outside the furnace body and communicating with the gas passage of the furnace cover to supply air flow into the furnace chamber, a heating device including a first heating device fixedly installed on the inner wall of the furnace body to adjust the environmental temperature of the furnace chamber, and a second heating device moving vertically and / or horizontally on the furnace body to adjust the local heating temperature of the sintered stone to be hot bent. The sintered stone hot bending furnace not only reduces energy consumption and shortens cooling time, but also ensures that the bending radius of the hot-bent sintered stone manufactured meets the design requirements, has a high degree of conformity with the mold, and does not affect the surface flatness or color decoration of the sintered stone.

Description

[Technical Field]

[0001] The present invention relates to the technical field of ceramic slab processing, and more particularly to a sintered stone hot bending furnace and a sintered stone hot bending method. [Background technology]

[0002] Flat sintered stone has a single structure and its range of use is limited, restricting the development of sintered stone production capacity. Sintered stone tea tables, sintered stone hand washing basins, and other products currently on the market are all made by cutting sintered stone and then gluing it together with adhesive, resulting in right-angled corners. With prolonged use, the glued areas tend to turn yellow or black, affecting the aesthetics. In Patent Document 1, cut sintered stone is placed in a mold and heated to its softening temperature, allowing gravity to shape it into a thermally processed sintered stone that conforms to the shape of the mold. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Chinese Patent Application Publication No. 111960653 [Patent Document 1] Chinese Patent Application Publication No. 114646218 [Patent Document 2] Chinese Patent Application Publication No. 102372423 [Patent Document 3] China Utility Model Registration Publication No. 209259924 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the method of Patent Document 1 has the drawback that the hot-bent sintered stone and the mold do not fit perfectly, resulting in a bending radius that does not meet the design requirements. Furthermore, the processing requires the entire hot-bending furnace to be heated to the softening temperature of the sintered stone, and then the hot-bent sintered stone must be cooled naturally before being removed, resulting in a long manufacturing period, high energy consumption, and high production costs. [Means for solving the problem]

[0005] In response to the above-mentioned problems, the present invention provides a sintered stone hot bending furnace and a sintered stone hot bending method, which adopts localized reheating and introduces directional airflow for rapid cooling, thereby reducing energy consumption, cooling time, production period, and production costs. Not only that, the bending radius of the hot-bent sintered stone produced meets the design requirements, has a high degree of conformity with the mold, and does not affect the surface flatness or color decoration of the sintered stone.

[0006] In a first aspect, the present invention provides a sintered stone hot bending furnace, the sintered stone hot bending furnace comprising: A furnace body, a mold placed in the furnace chamber for placing the sintered stone to be hot bent; a furnace cover configured as an insulating plate, the insulating plate having a gas passage communicating with the furnace chamber; a blower unit that is installed outside the furnace body and communicates with the gas passage of the furnace cover to supply air flow into the furnace chamber; a first heating device fixedly installed on the inner wall of the furnace body to adjust the ambient temperature of the furnace chamber; A heating device including a second heating device that moves vertically and / or horizontally in the furnace body to adjust the local heating temperature of the sintered stone at the location to be hot-bent; a temperature control device installed on the outer wall of the furnace body, which displays the ambient temperature of the furnace chamber and the local temperature of the sintered stone at the location where hot bending processing is to be performed; a temperature sensing device interconnected with the temperature control device and the heating device, for adjusting the temperature control device to thereby adjust the heating power of the heating device; An observation port is installed on the outer wall of the furnace body for observing the hot bending state of the sintered stone inside the furnace chamber.

[0007] Preferably, the flow direction of the air flow coincides with the molding direction of the sintered stone toward the arc of the mold, and the sintered stone conforms toward the mold by the force of the air flow.

[0008] Preferably, the heat insulating plate has one or more holes formed therein to form a gas passageway which communicates with an external blower unit.

[0009] Preferably, the insulating plate includes a first insulating plate and a second insulating plate fitted into the first insulating plate, the second insulating plate being made of a porous material, the first insulating plate having one or more pores formed therein to form a gas passage, and the gas passage and the porous structure of the second insulating plate being connected to a blower unit to supply air flow into the furnace chamber.

[0010] Preferably, the second heat insulating board is made of honeycomb ceramics having a porous structure distributed on the surface and inside.

[0011] Preferably, an expansion bracket to which a second heating device is attached is disposed on the heat insulating plate of the furnace roof, and the movement of the second heating device is adjusted by controlling the expansion bracket.

[0012] Preferably, the temperature sensing device includes a first temperature sensing device installed on the inner wall of the furnace body to sense the environmental temperature inside the furnace chamber, and a second temperature sensing device arranged perpendicular to and spaced apart from the second heating device.

[0013] Preferably, a second temperature sensing device is attached to the expansion bracket and connected to the second heating device to sense the local temperature of the portion of the sintered stone to be hot bent.

[0014] In a second aspect, the present invention provides a method for hot bending sintered stone using any of the sintered stone hot bending furnaces described above. The method includes: Step S1: placing the sintered stone to be hot-bent on the mold and closing the furnace chamber; Step S2: turning on the first heating device to preheat the furnace chamber; Step S3: increasing the heating power of the first heating device, reheating the sintered stone until it softens, and promoting the initial molding of the sintered stone by its own gravity; Step S4: moving the second heating device to adjust the distance between the second heating device and the portion of the sintered stone to be hot-bent, and turning on the second heating device to locally heat the sintered stone so as to improve the fit between the sintered stone and the mold; Step S5: turning off the first heating device and the second heating device and turning on the blower unit to introduce air flow into the furnace chamber to rapidly cool the sintered stone, and aligning the flow direction of the air flow with the molding direction of the sintered stone toward the arc of the mold, so that the sintered stone is further fitted to the mold by the force of the air flow; and step S6 of turning off the blower unit, allowing the furnace chamber to cool naturally to room temperature, and removing the hot-bent sintered stones.

[0015] Preferably, the local heating temperature is 1200 to 1300°C. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 1 is a flow chart of a method for hot bending sintered stone using a sintered stone hot bending furnace according to the present invention. [Figure 2] Figure 2 is a perspective view of the sintered stone hot bending furnace of the present invention (some components are not shown). 1 is a gas passage, 2 is an insulating plate, 3 is a furnace body, 4 is a temperature sensor, 5 is a temperature controller, and 6 is an observation port. [Figure 3] Figure 3 is a cross-sectional view of the sintered stone hot bending furnace of the present invention. 1 is a gas passage, 2-1 is a first insulating plate, 2-2 is a second insulating plate, 3 is a furnace body, 4-1 is a first temperature sensor, 4-2 is a second temperature sensor, 7 is a first heating device, 8 is a second heating device, 9 is a sintered stone, 10 is a mold, and 11 is an expansion bracket. [Figure 4] Figure 4 shows the discoloration defects of dark-colored hot-bent sintered stone produced using existing sintered stone thermal processing equipment. [Figure 5] Figure 5 shows the arc error defect diagram of hot-bent sintered stones of different lots manufactured using existing sintered stone thermal processing equipment. [Figure 6] FIG. 6 is a schematic diagram of the arc error of hot-bent sintered stones of different lots manufactured in Example 1. [Figure 7] FIG. 7 is an image of the dark-colored hot-bent sintered stone produced in Example 1. [Figure 8] FIG. 8 is an image of the hot-bent sintered stone tea table manufactured in Example 2. DETAILED DESCRIPTION OF THE INVENTION

[0017] In order to make the objectives, technical solutions and technical effects of the present invention clearer, the present invention will be further described in detail below in conjunction with the brief description of the drawings and the detailed description of the invention.

[0018] The present invention provides a sintered stone hot bending furnace. The furnace body of the sintered stone hot bending furnace has a heat-insulating function. Preferably, the furnace body is made of a refractory heat-insulating material. The composition of the refractory heat-insulating material is not limited, and any refractory heat-insulating material commonly used in the field can be used. The shape and dimensions of the furnace body can be adaptively adjusted according to demand. In some embodiments, the furnace body has a rectangular parallelepiped structure.

[0019] The mold is placed in the furnace chamber and is used to place the sintered stone to be hot-bent. The mold may be a graphite mold, which has fast heat conduction and can withstand high temperatures. The mold manufacturing process and mold structure are common in the art, and a detailed description is omitted here. In practice, the graphite mold is formed based on the design drawing of the hot-bent sintered stone, and the shape, dimensions, and bending effect of the mold are consistent with the design drawing of the hot-bent sintered stone. The mold may be placed on a base on the opposite side of the furnace cover. Preferably, the upper surface of the base is fixedly connected to the lower surface of the mold.

[0020] The cover of a sintered stone hot bending furnace has a shape and dimensions that are compatible with the furnace body. For example, if the furnace body has a rectangular parallelepiped structure, the cover is also configured as a corresponding rectangular parallelepiped. The cover is placed over the furnace body to form a relatively closed space (furnace chamber) except for a specially designed gas passage. The cover is configured as an insulating plate. The insulating plate may be one-piece, two-piece, or of course, multi-piece. The insulating plate is provided with a gas passage that communicates with the furnace chamber.

[0021] The blower unit is installed outside the furnace body and communicates with the gas passage in the furnace cover to supply airflow into the furnace chamber. The blower unit may be an electric blower. The direction of the airflow coincides with the direction in which the sintered stones (which may have flat surfaces) change into the arc of the mold (i.e., the molding), and the force of the airflow causes the sintered stones to conform to the mold direction.

[0022] In some embodiments, the furnace cover is an integrally molded insulating plate. One or more holes are opened in the insulating plate to form gas passages that communicate with an external blower unit. During quenching, airflow supplied by the blower unit is blown directly into the furnace chamber through the gas passages. When the flow direction of the airflow coincides with the direction of change of the sintered stone according to the arc of the mold, the force of the airflow molds the sintered stone toward the mold. Because the mold is placed on a base opposite the furnace cover, the sintered stone placed on the mold can also correspond to the holes in the furnace cover, and the direction and strength of the force of the airflow can be maximized to maintain against external factors.

[0023] In some embodiments, the furnace cover is a two-piece insulating plate. The insulating plate includes a first insulating plate and a second insulating plate fitted into the first insulating plate. The second insulating plate has a shape that matches the first insulating plate. The first insulating plate and the second insulating plate may have one or more through-holes formed therethrough as gas passages. Preferably, the second insulating plate is made of a porous material, and the first insulating plate has one or more pores formed therein to form the gas passages. In this way, the gas passages and the porous structure of the second insulating plate communicate with the blower unit to supply airflow into the furnace chamber. In this way, the airflow supplied by the blower unit during quenching is blown directly into the furnace chamber through this gas passage, and when the flow direction of the airflow coincides with the direction of change of the sintered stones along the arc of the mold, the force of the airflow causes the sintered stones to conform toward the mold.

[0024] Preferably, the second insulating plate is made of honeycomb ceramic with a porous structure distributed on the surface and inside. The air flow delivered by the blower unit passes through the gas passage of the first insulating plate, enters the second insulating plate, and then enters the furnace chamber through the pores, and further acts on the sintered stones.

[0025] The heating device includes a first heating device and a second heating device. The first heating device is fixedly installed on the inner wall of the furnace body and functions to adjust the overall environmental temperature of the furnace chamber. The first heating device may employ a conventional electric heating element in this field, including, but not limited to, an electric heating wire (wire heating furnace), an electric heating tube, and an electric heating plate. For example, it may be a wire heating furnace. The number of heating elements in the first heating device can be adaptively adjusted according to actual conditions. In some embodiments, one or more wire heating furnaces are disposed on each of the inner walls of the furnace body on opposite sides. The environmental temperature of the furnace chamber can be changed by adjusting the heating power of the first heating device.

[0026] The second heating device is placed in the furnace chamber and can be moved vertically and / or horizontally within the furnace body. The second heating device is positioned at or near the location where the sintered stone is to be hot bent. By moving the second heating device, the distance between the second heating device and the location where the sintered stone is to be hot bent can be adjusted, and the local heating temperature of the sintered stone at that location can be changed. The second heating device can be a mobile heating element commonly used in this field. For example, it can be a mobile siliconite. The number of second heating devices can be adaptively adjusted according to actual conditions. The local heating temperature can be changed by adjusting the heating power of the second heating device.

[0027] A telescopic bracket, to which the second heating device is attached, is placed on the insulating plate of the furnace roof. The movement of the second heating device can be adjusted by controlling the telescopic bracket. For example, by adjusting the length of the telescopic bracket, the distance between the second heating device and the hot bending sintering stone can be adjusted. In this way, the second heating device and the mold are located on opposite sides, making the hot bending process more convenient to control.

[0028] The second heating device is movably arranged in the sintered stone hot bending furnace to locally heat the portion of the sintered stone to be hot bent, thereby allowing the portion of the sintered stone to be hot bent to fit tightly and quickly into the mold and achieve the design standard.

[0029] The temperature control device is installed on the outer wall of the furnace body and displays the ambient temperature of the furnace chamber and the local temperature of the sintered stone at the location where the hot bending process is to be performed. In some embodiments, the temperature control device includes a panel that displays the temperature.

[0030] The temperature sensing device is interconnected with the temperature control device and the heating device, and adjusts the heating power of the heating device by controlling the temperature control device. In some embodiments, the temperature sensing device includes a first temperature sensing device installed on the inner wall of the furnace body to sense the environmental temperature of the furnace chamber, and a second temperature sensing device arranged orthogonal to and spaced from the second heating device.

[0031] The temperature sensing device may be a thermocouple for temperature measurement. The first temperature sensing device can be provided with one or more thermocouples on each of the opposing inner walls of the furnace body to detect the ambient temperature in each area of the furnace chamber. The second temperature sensing device is preferably spaced 3 to 6 cm from the second heating device, which distance can adequately reflect the local temperature of the area of the sintered stone to be hot bent. Preferably, the second temperature sensing device, connected to the second heating device, is attached to an expansion bracket to sense the local temperature of the area of the sintered stone to be hot bent.

[0032] The observation port is installed on the outer wall of the furnace body to observe the hot bending state of the sintered stone in the furnace chamber. The observation port is one or more observation holes or observation windows.

[0033] In existing sintered stone hot bending furnaces, the entire sintered stone is heated during the production process of hot bending sintered stone, which causes the flat surfaces of the sintered stone to overheat, resulting in warping or discoloration, and the areas to be hot bent are insufficiently or unevenly heated, which is also prone to discoloration and makes it difficult to precisely fit the mold.The sintered stone hot bending furnace of the present invention overcomes the above problems, and the resulting hot-bent sintered stone has a high degree of matching precision with the mold, meeting design requirements and not affecting the surface flatness or color decoration of the sintered stone.

[0034] The hot bending method for sintered stone using the above-mentioned sintered stone hot bending furnace will be described below by way of example.

[0035] The sintered stone to be hot bent is selected. The composition of the sintered stone is not limited, and the composition of sintered stone commonly used in this field can be adopted. The specifications of the sintered stone are also not limited, but the specifications of the sintered stone must match the dimensions of the furnace chamber. In a specific embodiment, sintered stone manufactured by Monalisa Group Co., Ltd. is used.

[0036] The sintered stone to be hot-bent is placed on the surface of the mold, and the furnace chamber is closed. For example, the sintered stone to be hot-bent is placed on the mold in the furnace chamber, and the furnace chamber is closed by covering it with a furnace lid.

[0037] Preheating is performed. Sintered stone is a brittle porcelain slab made using advanced technology, and it is prone to cracking due to thermal stress during heating. Furthermore, sintered stone is a poor conductor of heat and has a relatively slow heat transfer rate. During the initial heating process, the temperature is low and the heat radiation is low. The surface of the sintered stone heats first, while the temperature of the mold in the furnace chamber is low. This results in a large temperature difference across the thickness of the sintered stone, which causes uneven heating and mismatched thermal expansion of the sintered stone, resulting in stress. If the thermal stress exceeds the strength of the sintered stone, it will explode. Within a certain range, the faster the heating rate, the greater the temperature difference and the greater the thermal stress. Therefore, preheating is required to heat the sintered stone uniformly across its thickness to prevent it from exploding during the process from room temperature to reheating. Preheating is performed using a first heating device. The furnace chamber is heated uniformly to 800-900°C within 25-50 minutes.

[0038] Reheating is performed by increasing the power of the first heating device to reheat and soften the sintered stone, which then undergoes initial molding under its own gravity. The shape of the initial molding roughly matches the mold. This reheating involves raising the ambient temperature of the furnace chamber from 800-900°C to 1000-1100°C within 30-40 minutes.

[0039] The fitting process is performed at a high temperature locally. The second heating device is moved to adjust the distance between the second heating device and the area of the sintered stone to be hot-bent. At the same time, the second heating device is turned on to locally heat the area of the sintered stone to be hot-bent, promoting the fitting (heat retention) of the area of the sintered stone to the mold. The movement of the second heating device can be controlled by a computer program. The distance between the second heating device and the area of the sintered stone to be hot-bent is preferably 1 to 3 cm. If the distance between the second heating device and the area of the sintered stone to be hot-bent is too close, the local temperature of the sintered stone will be too high, resulting in defects such as hot-bending holes. If the distance is too far, the area of the sintered stone to be hot-bent will not be effectively heated locally, affecting the bending effect. The local heating temperature can be 1200 to 1300°C. The sintering temperature range for sintered stone is 1250 to 1270°C. This local heating temperature further softens the area of the sintered stone to be hot-bent, allowing it to fully fit the mold.

[0040] The first and second heating devices are turned off, and air is introduced into the furnace chamber to perform quenching. The introduced air creates a downward force within the furnace chamber, further conforming the sintered stone to the mold. Specifically, airflow is introduced into the furnace chamber to quench the sintered stone. The direction of the airflow is aligned with the direction in which the sintered stone changes shape to fit the mold arc, and the force of the airflow further conforms the sintered stone to the mold. Conventional techniques involve high-temperature annealing through temperature control or slowly cooling the sintered stone naturally, but the lack of airflow makes it difficult to further mold the sintered stone into a mold. The quenching rate can be controlled by adjusting the airflow rate of the blower unit through control of the output power of the blower unit. When the airflow rate is high, a large amount of air enters the furnace, resulting in a rapid quenching rate; when the airflow rate is low, a small amount of air enters the furnace, resulting in a slow quenching rate.

[0041] Preferably, the rapid cooling is performed by lowering the temperature of the furnace chamber to 800-900°C within 30-50 minutes. For example, the rapid cooling is performed by lowering the temperature of the furnace chamber to 850°C within 30-50 minutes. By introducing a directional air flow into the furnace chamber to rapidly cool the sintered stone, the temperature drop rate is increased, shortening the product production period, and the softened sintered stone is further molded to fit the mold using the air force.

[0042] In some embodiments, the blower unit is turned on, and air enters the furnace chamber from the gas passage of the first insulating plate through the pores of the second insulating plate. After the gas enters, a certain downward force is formed, which acts on the softened sintered stone, and the softened sintered stone is further molded to fit the mold by the wind force. At the same time, the air can also achieve the purpose of rapid cooling.

[0043] Cool naturally. Turn off the blower and allow the furnace chamber to cool naturally to room temperature to obtain a hot-bent sintered stone that fits the mold and meets the bending radius design requirements.

[0044] The hot-bent sintered stone includes, but is not limited to, convex-arc sintered stone, concave-arc sintered stone, wave-shaped sintered stone, folded-plate sintered stone, etc. The hot-bent sintered stone also includes, but is not limited to, inner-bent sintered stone or outer-bent sintered stone, and the bending angle is not limited to a fixed angle.

[0045] The hot bending method of the present invention uses a first heating device to raise the ambient temperature of the furnace chamber to 1000-1100°C, and then forms the sintered stone into a basic shape that fits the mold using its own gravity.A second heating device is used to locally heat the area of the hot-bent sintered stone to be hot-bent, so that the area of the sintered stone to be hot-bent fits tightly and quickly into the mold, thereby achieving the design standard.

[0046] When manufacturing dark-colored hot-bent products using the thermal processing device and method of Patent Document 1, localized discoloration is observed in the hot-bent portion of the sintered stone, as shown in Figure 4, and large arc degree errors occur when manufacturing arc-shaped hot-bent products. As shown in Figure 5, the deviation in arc alignment between arc-shaped hot-bent products from different lots reaches 10 mm.

[0047] The present invention will be described in more detail below through examples. Similarly, the following examples are intended to further illustrate the present invention and are not intended to limit the scope of the present invention. Any non-essential improvements and adjustments made by those skilled in the art based on the above content of the present invention are also within the scope of the present invention. Specific process variables in the following examples are merely examples within the applicable range, i.e., those skilled in the art can select variables within an appropriate range based on the description of the present invention, and are not limited to the specific values in the following examples.

[0048] As shown in Figures 2 and 3, the hot bending furnace includes a furnace body 3 made of refractory insulation material. An insulating plate 2 is installed on top of the furnace body 3. The insulating plate 2 is a two-piece insulating plate consisting of a first insulating plate 2-1 and a second insulating plate 2-2. The second insulating plate 2-2 is fitted into the first insulating plate 2-1. The second insulating plate 2-2 is made of honeycomb ceramic with porous surfaces and interiors. A gas passage 1 is installed in the first insulating plate 2-1. The gas passage, the pores of the porous structure of the second insulating plate, and an external blower unit communicate with each other to supply airflow into the furnace chamber. A mold 10 is installed at the bottom of the furnace chamber of the furnace body 3. A sintered stone 9 to be hot bent is placed on the top surface of the mold 10. A first heating device 7 and a second heating device 8 are installed in the furnace chamber of the furnace body 3. The first heating device is a wire heating furnace, fixed to the inner wall of the furnace chamber. The second heating device is a mobile siliconite, mounted within the furnace chamber and movable vertically and horizontally to adjust the distance between the mobile siliconite and the sintered stone hot bending process. A first temperature sensor 4-1 for temperature measurement is attached to the side wall of the furnace chamber 3. An expandable bracket 11, to which a second temperature sensor 4-2 is attached, is attached to the insulating plate 2 of the furnace cover. A temperature control device 5 is attached to the outer wall of the furnace chamber 3. The temperature control device 5 is connected to the first heating device 7, the second heating device 8, the expandable bracket 11, the first temperature sensor 4-1, and the second temperature sensor 4-2. Adjusting the temperature control device 5 allows for adjustment of the ambient temperature within the sintered stone hot bending furnace during the hot bending process. The movement of the second heating device is controlled by adjusting the temperature control device 5, and more specifically, the distance between the second heating device 8 and the sintered stone 9 is controlled by adjusting the extension length of the extension bracket 11. The outer wall of the furnace body 3 is further provided with observation ports (three observation holes) 6 for observing the hot bending status of the sintered stone inside the furnace.

[0049] Example 1 The sintered stone is pre-processed. The sintered stone to be processed is cut to a thickness of 5.5 mm and the edges are polished, after which it is washed and dried. The dimensional deviation of the sintered stone after cutting is controlled to ±0.3 mm.

[0050] The hot bending process is performed. The graphite mold is placed on a base and fixed. The sintered stone to be hot bent is placed on the mold, and the sintered stone is aligned parallel to the four sides of the mold. The furnace lid is then placed on top and the hot bending furnace is closed. The first heating device is turned on to preheat the heating furnace, and the furnace chamber is heated to 800°C at a constant rate within 25 minutes.

[0051] The sintered stone is then reheated at high temperature to soften it and allow it to form an initial shape according to the mold shape under its own gravity. The reheating is carried out by slowly raising the temperature of the furnace chamber to 1000°C within 30 minutes.

[0052] The fitting process is performed at a high temperature locally. The second heating device is moved to control the distance between the second heating device and the part of the sintered stone to be hot-bent to 3 cm, and the second heating device is turned on to locally heat the part to be hot-bent to 1200°C. The fitting status of the sintered stone and the mold in the furnace chamber is observed through the observation hole until the sintered stone fits into the mold under its own gravity.

[0053] The first and second heating devices are turned off, and the blower unit is turned on. Air enters the furnace chamber through the gas passages in the first insulating plate and the holes in the second insulating plate. After the gas enters, a certain downward force is generated, acting on the softened sintered stone. The wind force further molds the sintered stone into the mold, achieving the goal of rapid cooling. The rapid cooling reduces the temperature of the furnace chamber to 850°C within 30 minutes.

[0054] The blower unit is turned off and the stone is allowed to cool naturally to room temperature, after which it is processed into hot-bent sintered stone with an inward bending angle of 125°.

[0055] Figure 6 is a schematic diagram of the arc degree error of different lots of sintered stones manufactured in Example 1. It was found that the arc degree error was significantly reduced. The maximum deviation of the arc conformity of the hot-bent sintered stones from different lots was only 3 mm.

[0056] Figure 7 is an image of the dark-colored hot-bent sintered stone produced in Example 1. No localized discoloration occurred in the dark-colored hot-bent sintered stone.

[0057] Example 2 The sintered stone is pre-processed. The sintered stone to be processed is cut to a thickness of 15.5 mm and the edges are polished, after which it is washed and dried. The dimensional deviation of the sintered stone after cutting is controlled to ±0.3 mm.

[0058] The hot bending process is performed. The graphite mold is placed on a base and fixed. The sintered stone to be hot bent is placed on the mold, and the sintered stone is aligned parallel to the four sides of the mold. The furnace cover is then placed on top and the hot bending furnace is closed. The first heating device is turned on to preheat the heating furnace, and the furnace chamber is heated to 850°C at a constant rate within 50 minutes.

[0059] The sintered stone is then reheated at high temperature to soften it and allow it to form an initial shape according to the mold shape under its own gravity. The reheating is carried out by slowly raising the temperature of the furnace chamber to 1100°C within 40 minutes.

[0060] The fitting process is performed at a high temperature locally. The second heating device is moved to control the distance between the second heating device and the part of the sintered stone to be hot-bent to 1.5 cm, and the second heating device is turned on to locally heat the part to be hot-bent to 1300°C. The fitting status of the sintered stone and the mold in the furnace chamber is observed through the observation hole until the sintered stone fits into the mold under its own gravity.

[0061] The first and second heating devices are turned off, and the blower is turned on. Air enters the furnace chamber through the gas passages in the first insulating plate and the holes in the second insulating plate. After the gas enters, a downward force is generated, acting on the softened sintered stone. This allows the sintered stone to further conform to the mold under the influence of the wind force, while also achieving the goal of rapid cooling. The furnace chamber temperature drops to 850°C within 50 minutes.

[0062] The air blower is turned off and the stone is allowed to cool naturally to room temperature, after which it is processed into a hot-bent sintered stone tea table with a bending angle of 90°.

[0063] Figure 8 is an image of the hot-bent sintered stone tea table manufactured in Example 2. The bending radius of the hot-bent sintered stone tea table meets the design requirements.

[0064] Example 3 The sintered stone is pre-processed. The sintered stone to be processed is cut to a thickness of 10.5 mm and the edges are polished, after which it is washed and dried. The dimensional deviation of the sintered stone after cutting is controlled to ±0.3 mm.

[0065] The hot bending process is performed. The graphite mold is placed on a base and fixed. The sintered stone to be hot bent is placed on the mold, and the sintered stone is aligned parallel to the four sides of the mold. The furnace lid is then placed on top and the hot bending furnace is closed. The first heating device is turned on to preheat the heating furnace, and the furnace chamber is heated to 900°C at a constant rate within 40 minutes.

[0066] The sintered stone is then reheated at high temperature to soften it and allow it to form an initial shape according to the mold shape under its own gravity. The reheating is carried out by slowly raising the temperature of the furnace chamber to 1050°C within 45 minutes.

[0067] The fitting process is carried out at a localized high temperature. The second heating device is moved to control the distance between the second heating device and the part of the sintered stone to be hot-bent to 1.0 cm, and the power to the second heating device is turned on to locally heat the part to be hot-bent to 1250°C. The fitting status of the sintered stone and the mold in the furnace chamber is observed through the observation hole until the sintered stone fits into the mold under its own gravity.

[0068] The first and second heating devices are turned off, and the blower is turned on. Air enters the furnace chamber through the gas passages in the first insulating plate and the holes in the second insulating plate. After the gas enters, a downward force is generated, acting on the softened sintered stone. This allows the sintered stone to further conform to the mold under the influence of the wind force, while also achieving the goal of rapid cooling. The furnace chamber temperature drops to 850°C within 45 minutes.

[0069] The air blower unit is turned off and the stone is allowed to cool naturally to room temperature before being processed into a hot-bent sintered stone hand basin.

Claims

1. A furnace body, a mold placed in the furnace chamber for placing the sintered stone to be hot bent; a furnace cover provided with a gas passage communicating with the furnace chamber; a blower unit that is installed outside the furnace body and communicates with the gas passage of the furnace cover to supply air flow into the furnace chamber; a first heating device fixedly installed on the inner wall of the furnace body to adjust the ambient temperature of the furnace chamber; a heating device including a second heating device that moves vertically and / or horizontally in the furnace body to adjust the local heating temperature of the sintered stone at a location to be hot-bent; a temperature control device installed on the outer wall of the furnace body, which displays the ambient temperature of the furnace chamber and the local temperature of the sintered stone at the location where hot bending processing is to be performed; a temperature sensing device interconnected with the temperature control device and the heating device, for adjusting the temperature control device to thereby adjust the heating power of the heating device; An observation port is installed on the outer wall of the furnace body for observing the hot bending state of the sintered stone in the furnace chamber; When hot bending sintered stone using a sintered stone hot bending furnace, the heating power of the first heating device is increased to reheat the sintered stone until it softens, thereby promoting the initial shaping of the sintered stone by its own gravity, the second heating device is moved to adjust the distance between the second heating device and the portion of the initially shaped sintered stone to be hot bent, and the second heating device is turned on to locally heat the sintered stone to improve the fit between the sintered stone and the mold, the first heating device and the second heating device are turned off and the blower unit is turned on to introduce air flow into the furnace chamber, and the flow direction of the air flow is aligned with the shaping direction of the sintered stone toward the arc of the mold, so that the sintered stone further fits into the mold by the force of the air flow.

2. The sintered stone hot bending furnace according to claim 1, wherein the furnace cover is provided with one or more holes to form gas passages, which communicate with an external blower unit.

3. the furnace roof includes a first insulating plate and a second insulating plate fitted into the first insulating plate, the second insulating plate is made of a porous material; The first insulating plate has one or more holes formed therein to form a gas passage; The sintered stone hot bending furnace according to claim 1, wherein the gas passage and the porous structure of the second insulating plate communicate with a blower unit to supply air flow into the furnace chamber.

4. 4. The sintered stone hot bending furnace according to claim 3, wherein the second insulating plate is made of honeycomb ceramics having a porous structure distributed on the surface and inside thereof.

5. 2. The sintered stone hot bending furnace according to claim 1, wherein an expansion bracket to which a second heating device is attached is disposed on the furnace cover, and the movement of the second heating device is adjusted by controlling the expansion bracket.

6. The temperature sensing device is a first temperature sensing device installed on the inner wall of the furnace body to sense the environmental temperature inside the furnace chamber; 2. The sintered stone hot bending furnace according to claim 1, further comprising a second temperature sensing device disposed perpendicular to and spaced apart from the second heating device.

7. 7. The sintered stone hot bending furnace according to claim 6, wherein a second temperature sensing device connected to the second heating device is attached to the expansion bracket to sense the local temperature of the sintered stone at a location where the sintered stone is to be hot bent.

8. A method for hot bending sintered stone using the sintered stone hot bending furnace according to any one of claims 1 to 7, Step S1: placing the sintered stone to be hot-bent on the mold and closing the furnace chamber; Step S2: turning on the first heating device to preheat the furnace chamber; Step S3: increasing the heating power of the first heating device, reheating the sintered stone until it softens, and promoting the initial molding of the sintered stone by its own gravity; Step S4: moving the second heating device to adjust the distance between the second heating device and the portion of the sintered stone to be hot-bent, and turning on the second heating device to locally heat the sintered stone so as to improve the fit between the sintered stone and the mold; Step S5: Turn off the first heating device and the second heating device, turn on the blower unit, introduce air flow into the furnace chamber to rapidly cool the sintered stone, and align the flow direction of the air flow with the molding direction of the sintered stone toward the arc of the mold, so that the sintered stone is further fitted to the mold by the force of the air flow; and step S6 of turning off the blower unit, allowing the furnace chamber to cool naturally to room temperature, and removing the hot-bent sintered stone.

9. The method according to claim 8, wherein the local heating temperature is 1200 to 1300°C.

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