Dry and wet double-layer stone-like PC brick forming machine and dry and wet double-layer stone-like PC brick forming method

Abstract

The invention discloses a dry and wet double-layer stone-like PC brick forming machine which comprises a moving platform and a rack, a forming die cavity is formed in the moving platform, a wet slurry discharging device, a pre-pressing device, a dry slurry discharging device and a main pressing device are arranged on the rack, the pre-pressing device comprises a pre-pressing head and a water pumping pipe, a water gathering groove is formed in the top of the pre-pressing head, the water pumping pipe is connected with the water gathering groove, and the main pressing device is connected with the water gathering groove. A plurality of water squeezing holes communicated with the water collecting groove are formed in the bottom surface of the pre-pressing head, and an anti-blocking device is arranged in the water collecting groove; when the wet pulp is pre-pressed, part of moisture in the wet pulp is removed, meanwhile, the wet pulp forms the surface material layer with the connecting convex columns, during main pressing, gaps of the base material layer formed by the dry pulp are filled with the residual moisture in the surface material layer, moisture does not need to be discharged, and the production efficiency is improved. And the connecting stability between the fabric layer and the base material layer is improved through the connecting convex columns.

Description

Technical Field

[0001] The invention relates to a dry-wet double-layer imitation stone PC brick forming machine and a dry-wet double-layer imitation stone PC brick forming method. Background Art

[0002] Existing compression molding processes include dry slurry compression molding and wet slurry compression molding; dry slurry compression molding is mainly a process of compression molding by mixing powder particles with necessary additives. Dry pressed products usually have higher density and compressive strength, so they are stronger and more durable; wet slurry compression molding is a process of compression molding when the slurry contains water. Wet pressed products usually have lower density and lighter characteristics. Because they maintain a higher water content, they are easier to form complex shapes and textures.

[0003] The authorization announcement number is CN 109397514 B. A stone-like brick forming machine is provided. The machine is provided by laying wet slurry in a lower forming mold frame, lifting the wet slurry in the lower forming mold frame to an upper forming mold frame, and then laying dry slurry on the wet slurry. The wet slurry and dry slurry in the upper forming mold frame are squeezed up and down, and the excess wet slurry water flows into the gap of the dry slurry without worrying about the problem of wet slurry drainage, thereby forming a stone-like PC brick formed by a composite compression mold of wet slurry and dry slurry. However, in the actual production process, the water content in the wet slurry is much larger than the gap space of the dry slurry. The wet slurry water flows into the gap of the dry slurry through extrusion, and only a part of the water will stay in the gap of the dry slurry. The other part of the water still needs to be drained, and this part of the water will bring out the additives of the dry slurry when passing through the gap of the dry slurry, resulting in increased friction between the powder particles and between the powder and the mold wall, thereby affecting the smooth progress of the molding process. In addition, the reduction of additives may also reduce the density and strength of the green body, resulting in uneven density distribution, which may have a negative impact on the quality of the final product. Summary of the invention

[0004] The object of the present invention is to provide a dry-wet double-layer imitation stone PC brick forming machine, comprising a mobile platform and a frame, wherein a forming mold cavity with an opening at the top is movably provided on the mobile platform, the mobile platform is penetrated through the lower part of the frame, and a wet slurry feeding device, a pre-pressing device, a dry slurry feeding device and a main pressing device are sequentially arranged on the frame along the moving sequence of the forming mold frame, the pre-pressing device comprises a pre-pressing head and a water pumping pipe, a water collecting trough is provided on the top of the pre-pressing head, the water pumping pipe is connected to the water collecting trough, a plurality of squeezing holes connected to the water collecting trough are opened on the bottom surface of the pre-pressing head, and an anti-blocking device for unblocking the squeezing holes is arranged in the water collecting trough.

[0005] Preferably, the water squeezing hole is a tapered hole which is small at the top and large at the bottom. The anti-blocking device comprises a lifting plate and a plurality of ejectors. The lifting plate is movably arranged in the water collecting trough up and down. A plurality of ejectors are fixedly arranged on the bottom surface of the lifting plate. The ejectors are plugged into the water squeezing holes one by one. A water-passing gap is left between the ejectors and the inner wall of the water squeezing hole. A water-passing limit head is provided at the lower end of the ejector. The water-passing limit head is located inside the water squeezing hole. The diameter of the water-passing limit head is larger than the minimum inner diameter of the water squeezing hole.

[0006] Preferably, a vertical guide slot is provided on the inner wall of the water collecting trough, a sliding block is provided on the edge of the lifting plate, and the sliding block is movably arranged in the guide slot.

[0007] Preferably, a water extraction hole is provided on one side of the bottom of the water collecting tank, and one end of the water extraction pipe is connected to the water extraction hole.

[0008] A method for forming a dry-wet double-layer stone-like PC brick comprises the following steps: S1, the mobile platform transfers the molding cavity to the bottom of the wet slurry feeding device, feeds the wet slurry into the molding cavity, and stops feeding when the wet slurry in the molding cavity reaches the material required for the imitation stone PC brick; S2. The mobile platform transfers the molding cavity to the bottom of the pre-pressing device. The pre-pressing head of the pre-pressing device descends to pre-press the wet slurry, removes part of the moisture in the wet slurry, and spreads the wet slurry flat on the bottom of the molding cavity to form a fabric layer with multiple connecting protrusions on the upper surface.

[0009] S3, the mobile platform transfers the forming cavity to the bottom of the dry slurry feeding device, and spreads the dry slurry required for the top surface of the imitation stone PC brick to the top of the fabric layer in the forming cavity, and stops feeding when the amount of dry slurry in the forming cavity reaches the amount corresponding to the remaining water in the fabric layer, so as to form a base material layer; S4. The mobile platform transfers the forming cavity to the bottom of the main pressing device, and the main pressing device is used to perform main pressing on the base material layer and the surface material layer in the forming cavity. Multiple connecting protrusions on the surface material layer are embedded in the bottom surface of the base material layer, and the surface material layer and the base material layer are compacted into a dry-wet double-layer imitation stone PC brick.

[0010] The advantages and beneficial effects of the present invention are as follows: a dry-wet double-layer imitation stone PC brick forming machine and a dry-wet double-layer imitation stone PC brick forming method are provided, wet slurry in a forming mold cavity is pre-pressed by a pre-pressing head, and during the pre-pressing process, part of the water in the wet slurry is removed and the wet slurry is formed into a surface layer with a plurality of connecting protrusions, and then the dry slurry is laid on the surface layer to form a base material layer, and the base material layer and the surface layer are mainly pressed, and the remaining water in the surface layer is filled into the gap of the base material layer, and the connecting protrusions between the surface layer and the base material layer are embedded, which effectively improves the connection stability between the surface layer and the base material layer, and improves the quality of the brick body. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the present invention.

[0012] Figure 2 It is a schematic diagram of the forming process of the dry-wet double-layer imitation stone PC brick in the present invention.

[0013] Figure 3 It is an enlarged schematic diagram of the water squeezing hole and the ejector pin in the present invention. DETAILED DESCRIPTION

[0014] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0015] The technical solution specifically implemented in the present invention is: like Figures 1 to 3 As shown, a dry-wet double-layer imitation stone PC brick forming machine includes a mobile platform 1 and a frame 2, the mobile platform 1 is movably provided with a forming cavity 3 with an opening on the top, the mobile platform 1 is penetrated through the lower part of the frame 2, and the frame 2 is provided with a wet slurry feeding device 4, a pre-pressing device 5, a dry slurry feeding device 6 and a main pressing device 7 in the moving order of the forming mold frame 3, the pre-pressing device 5 includes a pre-pressing head 51 and a water pumping pipe 52, the top of the pre-pressing head 51 is provided with a water collecting trough 53, the water pumping pipe 52 is connected to the water collecting trough 53, the bottom surface of the pre-pressing head 51 is provided with a plurality of squeezing holes 54 connected to the water collecting trough 53, and the water collecting trough 53 is provided with an anti-blocking device 55 for unblocking the squeezing holes 54.

[0016] The above-mentioned water squeezing hole 54 is a tapered hole which is small at the top and large at the bottom. The anti-blocking device 55 includes a lifting plate 551 and a plurality of ejector pins 552. The lifting plate 551 is movably arranged in the water collecting tank 53. The bottom surface of the lifting plate 551 is fixed with a plurality of ejector pins 552. The ejector pins 552 are plugged into the water squeezing hole 54 one by one. A water-passing gap 554 is left between the ejector pins 552 and the inner wall of the water squeezing hole 54. A water-passing limit head 553 is provided at the lower end of the ejector pin 552. The water-passing limit head 553 is located inside the water squeezing hole 54. The diameter of the water-passing limit head 553 is larger than the minimum inner diameter of the water squeezing hole 54.

[0017] A vertical guide slot 56 is formed on the inner wall of the water collecting tank 53 , and a slider 57 is formed on the edge of the lifting plate 551 . The slider 57 is movably disposed in the guide slot 56 .

[0018] A water extraction hole is provided at one side of the bottom of the water collecting tank 53 , and one end of the water extraction pipe 52 is connected to the water extraction hole.

[0019] The above-mentioned wet slurry feeding device 4, dry slurry feeding device 6 and main pressure device 7 have been disclosed in the existing patents in the background technology and will not be described in detail here.

[0020] A method for forming a dry-wet double-layer stone-like PC brick comprises the following steps: S1, the mobile platform 1 transfers the molding cavity 3 to the bottom of the wet slurry feeding device 4, feeds the wet slurry 8 into the molding cavity 3, and stops feeding when the wet slurry 8 in the molding cavity 3 reaches the material required for the imitation stone PC brick; S2, the mobile platform 1 transfers the molding cavity 3 to the bottom of the pre-pressing device 5, and the pre-pressing head 51 of the pre-pressing device 5 descends to pre-press the wet slurry 8, removes part of the moisture of the wet slurry 8, and spreads the wet slurry 8 on the bottom of the molding cavity 3 to form a material layer 81 with multiple connecting protrusions 82 on the upper surface.

[0021] S3, the mobile platform 1 transfers the molding cavity 3 to the bottom of the dry pulp feeding device 6, and spreads the dry pulp feeding to the top of the material layer 81 in the molding cavity 3. When the amount of dry pulp in the molding cavity 3 reaches the amount corresponding to the remaining water in the material layer 81, the feeding is stopped to form a base material layer 9; S4, the mobile platform 1 transfers the forming cavity 3 to the bottom of the main pressing device 7, and the main pressing device 7 is used to perform main pressing on the base material layer 9 and the surface layer 81 in the forming cavity 3. The multiple connecting bosses 82 on the surface layer 81 are embedded in the bottom surface of the base material layer 9, and the surface layer 81 and the base material layer 9 are compacted into a dry-wet double-layer imitation stone PC brick.

[0022] When making dry-wet double-layer imitation stone PC bricks, the forming machine of the present invention transfers the forming cavity 3 to the bottom of the wet slurry feeding device 4 through the mobile platform 1, feeds the wet slurry 8 into the forming cavity 3, and then transfers the forming cavity 3 filled with the wet slurry 8 to the bottom of the pre-pressing device 5, and the pre-pressing head 51 descends to pre-press the wet slurry 8; During the pre-pressing process, the wet slurry 8 will move toward the squeezing hole 54 under the influence of the squeezing force, and the wet slurry 8 will push up the ejector pin 552 in the squeezing hole 54, and the ejector pin 552 will drive the water-through limit head 553 at the lower end to move upward in the squeezing hole 54. Since the squeezing hole 54 is a tapered hole with a small top and a large bottom, when the water-through limit head 553 moves up a certain distance, it will get stuck with the inner wall of the squeezing hole 54, preventing the ejector pin 552 from completely falling out of the squeezing hole 54. The ejector pin 552 blocks the solid matter of the wet slurry 8, and the water in the wet slurry 8 continues to flow along the ejector pin 552 and the squeezing hole 54. The water flows upward through the water gap 554 between the inner walls and enters the water collecting groove 53 on the top of the pre-pressing head 51. The water in the water collecting groove 53 is then discharged through the water pumping pipe 52, thereby removing part of the water in the wet slurry 8. Then the pre-pressing head 51 is lifted upward, and the ejector pin 552 falls back into the corresponding squeezing hole 54. The ejector pin 552 pushes out the solid matter in the squeezing hole 54 to prevent the squeezing hole 54 from being blocked. Through the extrusion molding of the pre-pressing head 51, the wet slurry 8 is spread flat on the bottom of the molding cavity 3 and forms a fabric layer 81 with a plurality of connecting protrusions 82. Afterwards, the forming mold cavity 3 carrying the surface layer 81 is transferred to the bottom of the dry slurry feeding device 6, and the dry slurry required for the top surface of the imitation stone PC brick is flatly laid above the surface layer 81 in the forming mold cavity 3. When the amount of dry slurry in the forming mold cavity 3 reaches the amount corresponding to the remaining water in the surface layer 81, the feeding is stopped to form a base material layer 9; Finally, the forming cavity 3 carrying the fabric layer 81 and the base material layer 9 is transferred to the bottom of the main pressing device 7, and the main pressing device 7 is used to perform main pressing on the base material layer 9 and the fabric layer 81 in the forming cavity 3. The multiple connecting bosses 82 on the fabric layer 81 are embedded in the bottom surface of the base material layer 9, and the fabric layer 81 and the base material layer 9 are compacted into a dry and wet double-layer imitation stone PC brick.

[0023] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A dry and wet double-layer imitation stone PC brick forming machine, characterized by: It includes a mobile platform and a frame, wherein a forming mold cavity with an opening on the top is movably provided on the mobile platform, the mobile platform is penetrated through the lower part of the frame, and a wet slurry feeding device, a pre-pressing device, a dry slurry feeding device and a main pressing device are sequentially arranged on the frame along the moving order of the forming mold frame, the pre-pressing device includes a pre-pressing head and a water pumping pipe, a water collecting trough is provided on the top of the pre-pressing head, the water pumping pipe is connected to the water collecting trough, a plurality of squeezing holes connected to the water collecting trough are opened on the bottom surface of the pre-pressing head, and an anti-blocking device for unblocking the squeezing holes is provided in the water collecting trough.

2. A dry-wet double-layer imitation stone PC brick forming machine according to claim 1, characterized in that: The water squeezing hole is a tapered hole that is small at the top and large at the bottom. The anti-blocking device includes a lifting plate and a plurality of ejectors. The lifting plate can be movably arranged in the water collecting tank up and down. A plurality of ejectors are fixedly arranged on the bottom surface of the lifting plate. The ejectors are plugged into the water squeezing holes one by one. A water-passing gap is left between the ejectors and the inner wall of the water squeezing hole. A water-passing limit head is provided at the lower end of the ejector. The water-passing limit head is located inside the water squeezing hole. The diameter of the water-passing limit head is larger than the minimum inner diameter of the water squeezing hole.

3. A dry-wet double-layer imitation stone PC brick forming machine according to claim 2, characterized in that: A vertical guide slot is provided on the inner wall of the water collecting tank, a sliding block is provided on the edge of the lifting plate, and the sliding block is movably arranged in the guide slot.

4. A dry-wet double-layer imitation stone PC brick forming machine according to claim 3, characterized in that: A water pumping hole is provided on one side of the bottom of the water collecting tank, and one end of the water pumping pipe is connected to the water pumping hole.

5. A method for forming a dry and wet double-layer imitation stone PC brick, characterized in that: The following steps are involved: S1, the mobile platform transfers the forming cavity to the bottom of the wet slurry feeding device, feeds the wet slurry into the forming cavity, and stops feeding when the wet slurry in the forming cavity reaches the material required for the imitation stone PC brick; S2. The mobile platform transfers the molding cavity to the bottom of the pre-pressing device. The pre-pressing head of the pre-pressing device descends to pre-press the wet slurry, removes part of the moisture in the wet slurry, and spreads the wet slurry flat on the bottom of the molding cavity to form a fabric layer with multiple connecting protrusions on the upper surface. S3, the mobile platform transfers the molding cavity to the bottom of the dry pulp feeding device, spreads the dry pulp feeding to the top of the fabric layer in the molding cavity, and stops feeding when the amount of dry pulp in the molding cavity reaches the amount corresponding to the remaining water in the fabric layer, thereby forming a base material layer; S4. The mobile platform transfers the forming cavity to the bottom of the main pressing device, and the main pressing device is used to perform main pressing on the base material layer and the surface material layer in the forming cavity. Multiple connecting protrusions on the surface material layer are embedded in the bottom surface of the base material layer, and the surface material layer and the base material layer are compacted into a dry-wet double-layer imitation stone PC brick.

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