Method for reinforcing, toughening and whitening bottom of ceramic tile and blank bottom slurry spraying system

Abstract

The invention relates to the technical field of ceramic production, in particular to a method for reinforcing, toughening and whitening a bottom of a ceramic tile. Comprising the following steps: S1, performing compression molding on ceramic powder to obtain a ceramic tile blank; s2, slurry spraying is carried out on the blank bottoms of the ceramic green bricks, and ceramic blank bottom whitening slurry is adopted for slurry spraying; the ceramic body bottom whitening slurry is prepared by mixing and ball-milling whitening slurry and water; by the adoption of the method, the whiteness of the ceramic bottom face can be effectively improved, and then the attractiveness of the product is improved; in addition, slurry is sprayed on the bottom surface of the ceramic tile blank, a compact wrapping layer is formed at the joint of the slurry and the tile blank in the firing process, namely, a high-compact interlayer is formed on the bottom surface and the front surface of the tile blank to wrap the tile blank, so that the mechanical properties such as breaking strength and toughness of the whole tile blank are improved, and the defects such as corner breakage of the bottom surface of the ceramic tile are reduced; the invention further provides a blank bottom slurry spraying system so as to improve the slurry spraying efficiency of the bottom face of the ceramic blank.

Description

Technical Field

[0001] The present invention relates to the technical field of ceramic production, in particular to a method for enhancing the strength, toughness and whiteness of ceramic tiles and a slurry spraying system for the bottom of the blank. Background Art

[0002] Ceramic production depends on the supply of ceramic non-metallic minerals. The iron content (mainly referring to the content of Fe2O3) in ceramic raw materials is an important factor affecting the whiteness of ceramic products. Due to the increasing scarcity of high-end ceramic raw materials, the ceramic industry tends to use low-cost environmentally friendly ceramic raw materials. When using these low-cost raw materials to produce ceramic powders for ceramic tiles, the following problems exist:

[0003] First: These ceramic raw materials have a high iron content and many impurities. In order to reduce the energy consumption of dewatering the slurry to make powder, the water content of the slurry is generally required to be as low as possible. Therefore, the iron removal effect is poor, and the whiteness of the obtained ceramic blank is relatively poor.

[0004] Second: In the process of dewatering and making powder in a spray tower, in order to increase the output and reduce the energy consumption, large-aperture spray plates are often used, resulting in a large hollowness rate of the powder, rough particles. After cloth spreading, small pits and protrusions are formed on the surface of the blank, with a large roughness. The surface of the blank is not smooth and flat, resulting in a rough back surface of the ceramic tile and an insufficiently dense bottom layer, which also affects the strength of the ceramic tile.

[0005] Generally speaking, for ceramic tiles produced by the above method using low-quality raw materials, their back surfaces have a low whiteness, are rough and have low strength. This black and rough back surface of the ceramic tile will greatly affect the grade of the ceramic product. When ordinary consumers buy ceramic tiles, they will think that the ceramic tile with a blacker back surface has poor quality, thus affecting the sales of the product.

[0006] There is a need to develop a new method to solve the problem of the black and rough back surface of the product at a lower cost, while improving the strength of the ceramic tile. Summary of the Invention

[0007] The present invention provides a method for enhancing the strength, toughness and whiteness of ceramic tiles to solve the problem that the back surfaces of the ceramic tiles obtained by the current above method are blacker, rougher and have lower strength.

[0008] To achieve the above functions, the technical solution provided by the present invention is as follows:

[0009] A method for enhancing the strength, toughness and whiteness of ceramic tiles, characterized in that it includes the following steps:

[0010] S1. Press the ceramic powder into shape to obtain a ceramic tile blank;

[0011] S2. Spray slurry on the bottom of the ceramic tile blank, and the slurry used for spraying is the whitening slurry for the bottom of the ceramic blank;

[0012] The ceramic blank bottom whitening slurry is formed by mixing a whitening slurry and water and then ball milling.

[0013] The weight percentages of the components of the whitening slurry include:

[0014] Washed clay or kaolin: 30% - 40%;

[0015] Potassium feldspar: 20% - 30%;

[0016] Potassium - sodium sand: 25% - 35%;

[0017] Talc: 5% - 8%;

[0018] Opacifying whitening agent: 3% - 8%;

[0019] Binder: 2% - 3%.

[0020] Preferably, the opacifying whitening agent is zirconium silicate or titanium dioxide.

[0021] Preferably, the total content of iron oxide and manganese oxide in the whitening slurry is less than 1.2%.

[0022] Preferably, the thickness of the slurry spraying is 0.1 mm - 0.5 mm.

[0023] The present invention also provides a blank bottom slurry spraying system, which includes a first ceramic tile blank turning device, a slurry spraying device, and a second ceramic tile blank turning device connected in sequence by a conveyor line. The slurry sprayed by the slurry spraying device is the ceramic blank bottom whitening slurry described in claim 1.

[0024] Preferably, the structures of the first ceramic tile blank turning device and the second ceramic tile blank turning device are the same, and include:

[0025] A rotating frame;

[0026] A rotation driving assembly, which is used to drive the rotating frame to rotate;

[0027] A tile blank conveyor line, which is installed in the rotating frame, and the conveying direction of the tile blank conveyor line is parallel to the rotation axis of the rotating frame; the tile blank conveyor line includes a conveyor line A and a conveyor line B, and a gap allowing the tile blank to pass through is provided between the conveyor line A and the conveyor line B;

[0028] A blocking assembly, which is installed on the rotating frame; the blocking assembly includes a left baffle mechanism, a right baffle mechanism, and a baffle driving mechanism. The left baffle mechanism and the right baffle mechanism are connected to the baffle driving mechanism, and the baffle driving mechanism drives the left baffle mechanism and the right baffle mechanism to approach or move away from each other.

[0029] Preferably, the conveyor line A and the conveyor line B are roller tracks.

[0030] Preferably, the baffle driving mechanism includes an upper bracket, a driving motor A, and more than 2 synchronous belts A. A plurality of the synchronous belts A are arranged in parallel on the upper bracket and are driven to rotate by the driving motor A through a main shaft A;

[0031] The left baffle mechanism and the right baffle mechanism are respectively connected to the synchronous belt A through connecting pieces.

[0032] Preferably, the left baffle mechanism and the right baffle mechanism have the same structure, and each includes an upper baffle plate and a lower baffle plate. The upper baffle plate and the lower baffle plate are connected by a plurality of connecting shafts, and a retaining wheel is rotatably arranged on the connecting shaft;

[0033] The upper baffle plate is arranged above the conveyor line A, and the lower baffle plate is arranged below the conveyor line B; the connecting shaft and the retaining wheel are arranged in the gap between two adjacent rollers of the roller track.

[0034] Preferably, the baffle driving mechanism includes a lower bracket and more than 2 synchronous belts B. A plurality of the synchronous belts B are arranged in parallel on the lower bracket and are driven to rotate by a main shaft B; the main shaft B is connected to the main shaft A through a synchronous belt C;

[0035] The upper baffle plate is connected to the synchronous belt A, and the lower baffle plate is connected to the synchronous belt B.

[0036] The blocking assembly further includes a plurality of guiding and smoothing mechanisms;

[0037] The guiding and smoothing mechanism includes a smoothing rod and a smoothing wheel. The smoothing rod is fixedly installed on the turntable, and the smoothing wheel is rotatably arranged on the upper baffle plate or the lower baffle plate;

[0038] A groove matched with the smoothing rod is formed on the smoothing wheel.

[0039] The beneficial effects of the present invention are as follows:

[0040] 1. In the method for enhancing, toughening and whitening the bottom of ceramic tiles of the present invention, by pouring the ceramic blank bottom whitening slurry on the bottom of the ceramic tile blank, on the one hand, it can well improve the whiteness of the bottom surface of the ceramic tile, achieving the purpose of whitening to improve the aesthetics of the product; on the other hand, after pouring the ceramic blank bottom whitening slurry on the bottom, the ceramic blank bottom whitening slurry can penetrate into the pores of the bottom surface of the ceramic tile blank, so it can significantly improve the bottom roughness, enhance the aesthetics of the bottom surface of the ceramic tile, and enhance the market attractiveness of the product;

[0041] 2. By spraying the bottom surface of the ceramic tile blank with the ceramic blank bottom brightening slurry adopted, the flowing slurry will wrap the bottom surface of the blank. At the same time, since one or more layers of glaze are also sprayed on the front surface of the blank, a dense wrapping layer is formed at the joint between the slurry and the blank and at the joint between the glaze and the blank during the firing process, which is equivalent to forming a highly dense interlayer on the bottom and front surfaces of the blank to wrap the blank, thereby improving the mechanical properties such as the overall breaking strength and modulus of rupture of the ceramic tile and achieving the effects of strengthening and toughening;

[0042] 3. The present invention also provides a bottom spraying system to improve the spraying efficiency of the bottom surface of the ceramic tile blank. This bottom spraying system can turn over multiple or large-sized ceramic tile blanks simultaneously, reducing the damage to the ceramic tile blanks during turning while improving the turning efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a schematic block diagram of the structure of the bottom spraying system for the embodiment;

[0044] Figure 2 It is a schematic structural diagram of the turning device;

[0045] Figure 3 For Figure 1 Another perspective structural diagram of;

[0046] Figure 4 It is a schematic structural diagram of the rotation driving component;

[0047] Figure 5 It is a schematic structural diagram of the blank conveying line;

[0048] Figure 6 It is a schematic structural diagram of the blocking component;

[0049] Figure 7 It is a schematic structural diagram of the combination of the blank conveying line and the blocking component. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0050] The following further elaborates on the present invention in conjunction with the attached Figure 1 To Figure 7 Attachments:

[0051] The present invention discloses ceramic blank bottom brightening slurries with the following several formulations. The weight percentages (wt%) of the components of each embodiment are shown in the following table:

[0052]

[0053] In the above embodiments, the opacifying brightening agent can be zirconium silicate or titanium dioxide, etc.

[0054] To ensure a relatively high whiteness of the bottom surface of the fired ceramic tile, the total content of iron oxide and manganese oxide in the ceramic blank bottom brightening slurry used for coating the bottom surface of the ceramic tile blank is less than 1.2%.

[0055] The brightening slurry in each of the above embodiments is successively subjected to the processes of batching, ball milling, sieving and iron removal, and slurry tank homogenization, so as to obtain a brightening slurry with a water content of 30% to 40%.

[0056] The ceramic powder is pressed into a shape to obtain a ceramic tile blank. The chemical composition and raw material composition of the ceramic powder are not limited, and commonly used ceramic powder in the art can be adopted. In this embodiment, to better match the ceramic tile blank with the brightening slurry. In this embodiment, the composition of the ceramic powder is as follows: in terms of weight percentage (wt%),

[0057] Washed mud paste or sand paste: 20 - 30%;

[0058] Original ore mud or mixed mud: 10 - 15%;

[0059] Potassium feldspar: 10 - 20%;

[0060] Potassium - sodium sand: 20 - 30%;

[0061] Sodium feldspar: 10 - 15%;

[0062] Talc: 3 - 5%.

[0063] Specifically, the composition of the ceramic powder in this embodiment is: washed mud paste: 20%; original ore mud: 15%; potassium feldspar: 20%; potassium - sodium sand: 28%; sodium feldspar: 13%; talc: 4%. A ceramic tile blank with a thickness of 10 mm is pressed according to the above ceramic powder formula.

[0064] The method for enhancing, toughening and whitening the bottom of the ceramic tile of the present invention comprises the following steps:

[0065] S1. Press the ceramic powder into a shape to obtain a ceramic tile blank, and remove the dust attached to the ceramic tile blank;

[0066] S2. Turn over the ceramic tile blank so that the bottom surface of the ceramic tile blank faces upward;

[0067] S3. Pour the slurry on the bottom of the ceramic tile blank, and the slurry used for pouring is the above - mentioned brightening slurry;

[0068] S4. Turn over the ceramic tile blank again so that the surface of the ceramic tile blank faces upward;

[0069] S5. Dry the ceramic tile blank after pouring the slurry.

[0070] After the above steps, existing processes such as applying surface glaze, drying, and firing to the surface of the tile blank are carried out to manufacture the ceramic tile.

[0071] When applying the slurry, the thickness of the slurry layer sprayed on the bottom surface of the ceramic tile blank is 0.1 - 0.5 mm.

[0072] White bottom tile blanks were obtained by respectively applying 0.1 mm thick brightening slurries 1, 2, 3, and 4 to 10 mm thick ceramic tile blanks, and a comparative tile blank without applying the brightening slurry. Then, these tile blanks were processed subsequently according to the same procedures and parameters, such as drying, surface glazing, and firing, to obtain Examples 1, 2, 3, 4, and Comparative Example 1.

[0073] According to GB / T 3810.4 - 2016 "Test Methods for Ceramic Tiles - Part 4: Determination of Modulus of Rupture and Breaking Strength", the breaking strength and modulus of rupture were measured, and the measurement results are summarized in the following table:

[0074] Measurement results of the mechanical properties of different samples:

[0075]

[0076]

[0077] It can be seen from the above measurement data that:

[0078] 1. Compared with Comparative Example 1, due to the covering effect of the opacifying brightener in the brightening slurry, the whiteness of the products fired after applying the slurry is increased by more than 10 degrees compared with the existing products directly fired without applying the slurry, greatly improving the appearance of the tile blank, and thus enhancing the popularity of the product in the hearts of customers.

[0079] 2. When applying the slurry on the bottom surface of the tile blank, the flowing slurry will wrap the bottom surface of the tile blank. Coupled with the glaze slurry applied on the surface of the tile blank, a dense wrapping layer is formed at the joint between the slurry and the glaze slurry and the tile blank during the firing process, which is equivalent to forming a highly dense sandwich layer on the bottom and front surfaces of the tile blank to wrap the tile blank, thereby improving the mechanical properties such as the overall breaking strength and modulus of rupture of the ceramic tile, achieving the effects of strengthening and toughening. It can be seen from the measurement data that the breaking strength of the ceramic tile in the examples is increased by more than 60%, and its modulus of rupture is increased by more than 30%.

[0080] In addition, since the mineral compositions of the brightening slurry and the body both fall within the reasonable range of high-temperature firing and vitrification, and their expansion coefficients, elastic moduli, and firing shrinkages are relatively consistent, the brightening slurry can be well matched with the tile blank. When the products after applying the slurry are fired, no cracks, spalling, etc. will occur on the bottom slurry layer.

[0081] The present invention also provides a bottom slurry application system to implement the slurry application process in the method for strengthening, toughening, and whitening the bottom of the ceramic tile of the present invention.

[0082] Such asFigure 1 A blank bottom slurry spraying system as shown in the figure includes a first ceramic tile blank turning device 20, a slurry spraying device 30, and a second ceramic tile blank turning device 40 that are sequentially connected by a conveyor line 10. The slurry sprayed by the slurry spraying device 30 is the above-mentioned ceramic blank bottom whitening slurry.

[0083] In this embodiment, the conveyor line 10 can adopt an existing belt conveyor line, and the slurry spraying device 30 can adopt an existing glaze cabinet, such as the glaze cabinet of the ceramic spraying equipment disclosed in the Chinese utility model patent CN206780619U, so as to uniformly spray a ceramic blank bottom whitening slurry with a thickness of 0.1 - 0.5 mm on the bottom surface of the ceramic tile blank.

[0084] The first ceramic tile blank turning device 20 and the second ceramic tile blank turning device 40 adopt turning devices with the same structure.

[0085] Such as Figure 2 and Figure 3 A turning device as shown in the figure includes a turntable 1, a rotation driving assembly 2, a tile blank conveyor line 3, a blocking assembly 4, and a mounting frame 5. It should be noted that for the convenience of description, we have marked six directions of front, back, left, right, up, and down in Figure 2 the figure.

[0086] Such as Figure 3 shown, the turntable 1 includes a coaxial active rotating ring 11 and a driven rotating ring 12. On the left and right sides below the active rotating ring 11 and the driven rotating ring 12, supporting wheels 13 that cooperate with the active rotating ring 11 or the driven rotating ring 12 are respectively arranged. Both ends of the rotating shaft of the supporting wheel 13 are rotatably installed on the mounting frame 5 through bearings. A retaining block 131 is arranged on the supporting wheel 13, and the active rotating ring 11 or the driven rotating ring 12 is limited by the retaining block 131. The main function of the supporting wheel 13 is to support and position the turntable 1 to ensure the equipment remains stable during rotation.

[0087] The rotation driving assembly 2 is used to drive the turntable 1 to rotate. Such as Figure 2 and Figure 4 shown, the rotation driving assembly 2 includes a driving motor B21, a driving sprocket 22, and a driven sprocket 23. The driving sprocket 22 is connected to the driving motor B21 and driven by the driving motor B21 to rotate. In this embodiment, the driving motor B21 can adopt common equipment such as a reduction motor and a servo motor. The driving motor B21 is connected to the driving sprocket 22 through a coupling 24. The driven sprocket 23 is coaxial with the active rotating ring 11 and fixedly installed on the active rotating ring 11. The driving sprocket 22 drives the driven sprocket 23 to rotate through a chain 25, thereby driving the turntable 1 to rotate.

[0088] Such as Figure 2 or Figure 3As shown in the figure, the supporting rollers 13, the driving motor B21, etc. are installed on the mounting bracket 5. Since the rotating bracket 1 is mounted on the supporting rollers 13, the rotating bracket 1 is thus set on the mounting bracket 5. Further, a number of leveling bolts 6 are provided at the bottom of the mounting bracket 5, and the horizontal installation of this equipment can be achieved by adjusting the leveling bolts 6.

[0089] As Figure 2 shown in the figure, the green brick conveying line 3 is arranged inside the driving rotating ring 11 and the driven rotating ring 12 of the rotating bracket 1. The conveying direction of the green brick conveying line 3 is parallel to the rotating axis of the rotating bracket 1.

[0090] As Figure 2 and Figure 5 shown in the figure, the green brick conveying line 3 includes a conveying line A31 and a conveying line B32. A gap 33 allowing the green bricks to pass through is provided between the conveying line A31 and the conveying line B32; the conveying line A31 and the conveying line B32 are roller tracks. In this embodiment, the conveying line A31 and the conveying line B32 are symmetrically arranged up and down. Taking any one of the conveying lines as an example, its structure is described as follows. It includes a number of rollers 321, a synchronous belt D322, a driving pulley D323, a driven pulley D324, and a driving motor C325. A number of rollers 321 are arranged in parallel on the side plates 300, and both ends of the rollers 321 are rotatably connected to the side plates 300 through bearings. In this embodiment, a driven pulley D324 is provided at the same end of each roller 321. The driving pulley D323 is connected to the driving motor C325 and is driven to rotate by the driving motor C325. The driving pulley D323 and the driven pulley D324 are connected by the synchronous belt D322. In order to make the synchronous belt D322 better fit with the driven pulley D324, a number of tension wheels 326 are also provided in this embodiment. The gap 33 between the conveying line A31 and the conveying line B32 in this embodiment is 9 - 20 mm.

[0091] As Figure 7 shown in the figure, the blocking assembly 4 is installed on the green brick conveying line 3. The blocking assembly 4 includes a left baffle mechanism 41, a right baffle mechanism 42, and a baffle driving mechanism 43. The left baffle mechanism 41 and the right baffle mechanism 42 are connected to the baffle driving mechanism 43, and the baffle driving mechanism 43 drives the left baffle mechanism 41 and the right baffle mechanism 42 to approach or move away from each other.

[0092] As Figure 6As shown, the baffle driving mechanism 43 includes an upper bracket 431, a driving motor A 432, and more than 2 synchronous belts A 433. The multiple synchronous belts A 433 are arranged in parallel on the upper bracket 431 and are driven to rotate by the driving motor A 432. In this embodiment, the number of synchronous belts A 433 is 2. The left and right ends of the synchronous belt A 433 are respectively sleeved on the driving pulley A and the driven pulley A. The driving pulley A and the driven pulley A are respectively rotatably installed on the upper bracket 431. The 2 driving pulleys A of the 2 synchronous belts A 433 are connected by a main shaft A 434. The driving motor A 432 is fixedly installed on the upper bracket 431 and drives the main shaft A 434 to rotate. In this embodiment, the driving motor A 432 uses a motor such as a servo motor.

[0093] The left baffle mechanism 41 and the right baffle mechanism 42 are respectively connected to the synchronous belt A 433 through connecting pieces. Among them, the left baffle mechanism 41 is connected to the belt below the synchronous belt A 433 (that is, the belt on the slack side of the synchronous belt A 433 when the driving motor A 432 rotates clockwise); the right baffle mechanism 42 is connected to the belt above the synchronous belt A 433 (that is, the belt on the tensioned side of the synchronous belt A 433 when the driving motor A 432 rotates clockwise). In this way, when the main shaft A 434 rotates clockwise, the left baffle mechanism 41 and the right baffle mechanism 42 move away from each other, and when the main shaft A 434 rotates counterclockwise, the left baffle mechanism 41 and the right baffle mechanism 42 move closer to each other.

[0094] The left baffle mechanism 41 and the right baffle mechanism 42 have the same structure and respectively include an upper baffle plate 401 and a lower baffle plate 402. The upper baffle plate 401 and the lower baffle plate 402 are connected by a plurality of connecting shafts 403. A retaining wheel 404 is rotatably arranged on the connecting shaft 403.

[0095] As Figure 3 and Figure 7 shown, the upper baffle plate 401 is arranged above the conveyor line A 31, and the lower baffle plate 402 is arranged below the conveyor line B 32; the connecting shaft 403 and the retaining wheel 404 are arranged in the gap between two adjacent rollers 321 of the roller path. Through such a setting, the retaining wheel 404 will not interfere with the roller 321 when moving left and right. To better protect the ceramic tile blanks on the roller 321, a rubber layer is provided on the outer surface of the roller 321.

[0096] Since the volume of large-size ceramic tile blanks, such as the currently popular rock slabs, is very large, to ensure that the left baffle mechanism 41 and the right baffle mechanism 42 can smoothly push the ceramic tile blanks, and to prevent the ceramic tile blanks from pressing one side of the left baffle mechanism 41 or the right baffle mechanism 42 during rotation, resulting in its deformation, as Figure 6As shown, in this embodiment, the baffle driving mechanism 43 includes a lower bracket 435 and more than two synchronous belts B436. The multiple synchronous belts B436 are arranged in parallel on the lower bracket 435. The left and right ends of the synchronous belt B436 are respectively sleeved on the driving pulley B and the driven pulley B, and the driving pulley B and the driven pulley B are respectively rotatably installed on the lower bracket 435. The two driving pulleys B of the two synchronous belts B436 are connected by a main shaft B437. The main shaft A434 and the main shaft B437 are connected by a synchronous belt C438. The upper and lower ends of the synchronous belt C438 are respectively sleeved on the driving pulley C and the driven pulley C, and the driving pulley C and the driven pulley C are respectively rotatably installed on the main shaft A434 and the main shaft B437. Through such a setting, the driving motor A432 can drive the main shaft B437 to rotate.

[0097] Further, to make the upper baffle 401 and the lower baffle 402 move more smoothly during the process of approaching or separating from each other and prevent the upper baffle 401 and the lower baffle 402 from deforming, as Figure 7 shown, the blocking assembly 4 further includes a plurality of guiding and smoothing mechanisms 44. The guiding and smoothing mechanism 44 includes a smoothing rod 441 and a smoothing wheel 442. The smoothing rod 441 is fixedly installed on the brick blank conveying line 3, and the smoothing wheel 442 is rotatably arranged on the upper baffle 401 or the lower baffle 402; a groove matching with the smoothing rod 441 is formed on the smoothing wheel 442.

[0098] As Figure 7 shown, in this embodiment, the number of the guiding and smoothing mechanisms 44 is 8. The 8 guiding and smoothing mechanisms 44 are divided into two groups, with 4 in each group, and are symmetrically installed above the conveying line A31 and below the conveying line B32 respectively. The 4 guiding and smoothing mechanisms 44 in each group are evenly distributed along the axis of the upper baffle 401 or the lower baffle 402. The upper baffle 401 and the lower baffle 402 are respectively connected by the cooperation of the smoothing wheel 442 and the smoothing rod 441 on the same side.

[0099] As Figure 7 shown, an electric eye mounting bracket 45 is further arranged above the conveying line A31 in the front and rear directions of brick blank conveying, for installing monitoring devices such as photoelectric switches for monitoring the entry or exit of brick blanks into or from the brick blank conveying line 3.

[0100] During the working process of the turntable 1 of the present invention, the turntable 1 can be rotated clockwise or counterclockwise by controlling the forward and reverse rotation of the driving motor B21, and the turntable 1 can be rotated 180° clockwise or counterclockwise through the positioning of a photoelectric switch (not shown in the figure) installed on the driven rotating ring 12. To prevent failures in the control of the photoelectric switch or the driving motor B21, as Figure 1 and Figure 2As shown in the figure, in this embodiment, the brick turning device further includes a limiting mechanism 6 arranged on both sides of the turntable 1. The limiting mechanism 6 includes a limiting seat 61, a limit switch 62 and a limiting rod 63. The limit switch 62 is installed on the limiting seat 61, and the limiting rod 63 is installed on the turntable 1. A total of 4 limiting mechanisms 6 are provided in this embodiment, as Figure 2 , Figure 3 shown, respectively located on both sides of the driving rotary ring 11 and the driven rotary ring 12. The limiting rods 63 are respectively installed on the driving rotary ring 11 and the driven rotary ring 12. When an accident causes the rotation of the turntable 1 to exceed 180°, the limiting rod 63 will trigger the limit switch 62, thereby forcibly shutting down the driving motor B21 to achieve the purpose of emergency braking and protect the equipment of the present invention.

[0101] The working principle of the brick turning equipment is as follows. When the equipment is powered on, it is in the initial state:

[0102] Step 1: After the ceramic brick blank is conveyed onto the conveying line B32 of the brick turning equipment of the present invention, the driving motor C325 on the conveying line B32 drives the rollers 321 on the conveying line B32 to rotate, and conveys the brick blank to the middle of the conveying line B32;

[0103] Step 2: Start the driving motor A432, make the driving motor A432 rotate counterclockwise, thereby driving the main shaft A434 to rotate. The main shaft A434 drives the main shaft B437 to rotate synchronously through the synchronous belt C438. The rotating main shaft A434 and main shaft B437 respectively drive the left baffle mechanism 41 and the right baffle mechanism 42 to approach each other through the synchronous belt A433 and the synchronous belt B436, so that the retaining wheels 404 on the left baffle mechanism 41 and the right baffle mechanism 42 clamp the brick blank located between the conveying line A31 and the conveying line B32 from both left and right sides, and make the brick blank centered left and right;

[0104] Step 3: Start the driving motor B21. The driving motor B21 drives the driving sprocket 22 to rotate clockwise or counterclockwise. Through the transmission of the chain 25, the driven sprocket 23 also rotates accordingly, and finally the entire turntable 1 rotates. When the turntable 1 rotates 180° clockwise or counterclockwise, shut down the driving motor B21. At this time, the upper and lower positions of the conveying line A31 and the conveying line B32 are reversed, that is, the conveying line B32 is located above and the conveying line A31 is located below. The brick blank located between the conveying line A31 and the conveying line B32 also completes a 180° flip. Since there are retaining wheels 404 blocking the left and right sides of the brick blank, the brick blank will not fall from the gap between the conveying line A31 and the conveying line B32 during the flipping process;

[0105] Step 4: Rotate the driving motor A432 clockwise to drive the left baffle mechanism 41 and the right baffle mechanism 42 to move away from each other, releasing the clamped brick blank. Start the driving motor C325 on the conveying line A31 to drive the rollers 321 on the conveying line A31 to rotate, convey the flipped brick blank out of the conveying line A31, and convey the unflipped brick blank to the middle of the conveying line A31. Repeat Step 2 and Step 3. It should be noted that when Step 3 is executed again, the driving motor B21 should rotate in the opposite direction to the previous rotation direction, that is, the turntable rotates alternately in a 180° clockwise or counterclockwise rotation to avoid entanglement of wires or data lines when the turntable rotates.

[0106] By circulating in this way, the brick blank can be continuously turned over.

[0107] The working process of the green bottom slurry spraying system of the present invention is as follows:

[0108] S21: The ceramic brick blank that has been pressed and cleaned of the attached dust is placed face up and conveyed to the first ceramic brick blank turning device 20 through a belt conveyor.

[0109] S22: The first ceramic brick blank turning device 20 turns over the ceramic brick blank so that its bottom surface faces up.

[0110] S23: The ceramic brick blank with the bottom surface facing up is conveyed to the slurry spraying device 30 through a belt conveyor. The slurry spraying device 30 sprays the bottom surface of the ceramic brick blank, so that the bottom surface and the side surface of the ceramic brick blank are coated with a ceramic green bottom whitening slurry with a thickness of 0.1 - 0.5 mm.

[0111] S24: The ceramic brick blank after slurry spraying is continuously conveyed to the second ceramic brick blank turning device 40 through a belt conveyor.

[0112] S25: The second ceramic brick blank turning device 40 turns over the ceramic brick blank so that its surface faces up, and then it is conveyed to the next process through a belt conveyor.

[0113] The above embodiments are only preferred examples of the present invention and do not limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made according to the structures, features, and principles described in the scope of the patent application of the present invention should be included within the scope of the patent application of the present invention.

Claims

1. A method for enhancing the strength, toughness and whiteness of ceramic tiles, characterized in that: It includes the following steps: S1. Press the ceramic powder into shape to obtain a ceramic tile blank; S2. Apply slurry to the bottom of the ceramic tile blank, and the slurry used for application is the ceramic bottom whitening slurry; The ceramic bottom whitening slurry is formed by mixing a whitening slurry and water and grinding them in a ball mill; The weight percentage composition of the whitening slurry includes: Washed mud or kaolin: 30% - 40%; Potassium feldspar: 20% - 30%; Potassium-sodium sand: 25% - 35%; Talc: 5% - 8%; Opacifying whitening agent: 3% - 8%; Binder: 2% - 3%.

2. The method for enhancing the strength, toughness and whiteness of the ceramic tile according to claim 1, wherein: The opacifying whitening agent is zirconium silicate or titanium dioxide.

3. The method for enhancing the strength, toughness and whiteness of ceramic tiles according to claim 1, characterized in that: The total content of iron oxide and manganese oxide in the whitening slurry is less than 1.2%.

4. The method for enhancing the strength, toughness and whiteness of the ceramic tile according to claim 1, characterized in that: The thickness of the applied slurry is 0.1 mm - 0.5 mm.

5. A blank bottom slurry spraying system, characterized in that: The bottom slurry application system is used to implement step S2 of the method for enhancing toughness and whitening the bottom of a ceramic tile described in any one of claims 1 - 4, and includes a first ceramic tile blank turning device, a slurry application device, and a second ceramic tile blank turning device sequentially connected by a conveyor line. The slurry sprayed by the slurry application device is the ceramic bottom whitening slurry described in claim 1.

6. The green body bottom slip casting system according to claim 5, wherein: The structures of the first ceramic tile blank turning device and the second ceramic tile blank turning device are the same, and include: A rotating frame; A rotation driving assembly, which is used to drive the rotating frame to rotate; A tile blank conveyor line, which is installed inside the rotating frame, and the conveying direction of the tile blank conveyor line is parallel to the rotation axis of the rotating frame; the tile blank conveyor line includes conveyor line A and conveyor line B, and a gap allowing the tile blank to pass through is provided between conveyor line A and conveyor line B; A blocking assembly, which is installed on the rotating frame; the blocking assembly includes a left baffle mechanism, a right baffle mechanism, and a baffle driving mechanism. The left baffle mechanism and the right baffle mechanism are connected to the baffle driving mechanism, and the baffle driving mechanism drives the left baffle mechanism and the right baffle mechanism to approach or move away from each other.

7. The green body bottom slip casting system according to claim 6, characterized in that: Conveyor line A and conveyor line B are roller tracks.

8. The blank bottom slurry spraying system according to claim 7, characterized in that: The baffle driving mechanism includes an upper support, a driving motor A, and more than 2 synchronous belts A. The multiple synchronous belts A are arranged in parallel on the upper support and are driven to rotate by the driving motor A through a main shaft A; The left baffle mechanism and the right baffle mechanism are respectively connected to the synchronous belt A through connecting pieces.

9. The blank bottom slip casting system according to claim 8, characterized in that: The structures of the left baffle mechanism and the right baffle mechanism are the same, and each includes an upper baffle plate and a lower baffle plate. The upper baffle plate and the lower baffle plate are connected by several connecting shafts, and a retaining wheel is rotatably arranged on the connecting shaft; The upper baffle plate is arranged above conveyor line A, and the lower baffle plate is arranged below conveyor line B; the connecting shaft and the retaining wheel are arranged in the gap between two adjacent rollers of the roller track.

10. The green body bottom slip casting system according to claim 9, characterized in that: The baffle driving mechanism includes a lower support, more than 2 synchronous belts B. The multiple synchronous belts B are arranged in parallel on the lower support and are driven to rotate by a main shaft B; the main shaft B is connected to the main shaft A through a synchronous belt C; The upper baffle plate is connected to the synchronous belt A, and the lower baffle plate is connected to the synchronous belt B. The blocking assembly further includes several guiding and smoothing mechanisms; The guiding and smoothing mechanism includes a smoothing rod and a smoothing wheel. The smoothing rod is fixedly installed on the rotating frame, and the smoothing wheel is rotatably arranged on the upper gear plate or the lower gear plate; A groove matching with the smoothing rod is formed in the smoothing wheel.

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