A device for uniformly filling a ceramic powder pressing mold

Abstract

The application discloses a kind of ceramic powder compaction mould uniform filling device, it is related to ceramic production technical field;Including compaction mould, filling frame is erected in compaction mould top, reciprocatingly mobile mobile filling strip is arranged in filling frame, and mobile filling strip fills powder layer in compaction mould in reciprocatingly mobile process, and powder layer includes single powder layer and combined powder layer, and piston pressure head is arranged in filling frame top;Powder is transported to mobile filling strip by powder conveying pipe, and in the process of mobile filling strip movement, material discharging roller is uniformly discharged, and the amount of powder released by each tooth slot is consistent, so as to ensure the effect of uniform filling, and the opening and closing control of the opening and closing rubber strip symmetrically arranged is effective and fast;In the process of powder filling, single powder layer is pre-pressed, and heated in the process of pre-pressing, accelerates gas overflow, avoids a large amount of gas to remain in powder, and affects the quality of subsequent products.

Description

Technical Field

[0001] This invention relates to the field of ceramic production technology, specifically to a uniform filling device for ceramic powder pressing molds. Background Technology

[0002] In the production of ceramic plates, ceramic powder is often filled into the pressing mold cavity at one time, and then hydraulic pressure is applied. During the pressing process, the gaps between the ceramic powders become smaller, and the powder particles rearrange and deform to be compacted, thereby generating a dense plate-like structure and forming a ceramic blank with a certain strength and shape, which is then fired.

[0003] However, in the above process, because the ceramic powder is filled in one go, the gaps between the ceramic powder particles become smaller during the pressing process. Some gas is expelled, but some gas cannot be expelled in time. This causes the gas to expand due to heat during the subsequent firing process, resulting in internal voids or external sand holes, thus affecting product quality. To address this, we provide a uniform filling device for ceramic powder pressing molds. Summary of the Invention

[0004] The purpose of this invention is to provide a uniform filling device for ceramic powder pressing molds.

[0005] The technical problem solved by this invention is:

[0006] (1) How to spread powder material evenly layer by layer so that the slippage of powder particles is small during the pressing process, the piston head is subjected to uniform force, and the pressing quality is improved.

[0007] (2) How to remove the gas in the powder in advance by pre-pressing and heating layer by layer, so as to minimize the generation of pores in the subsequent firing process;

[0008] The present invention can be achieved by the following technical solution: a ceramic powder pressing mold uniform filling device, including a pressing mold, a filling frame is set on the top of the pressing mold, a moving filling strip is reciprocated inside the filling frame, the moving filling strip fills the pressing mold with a powder layer during the reciprocating movement, the powder layer includes a single powder layer and a combined powder layer, and a piston head for pressing the powder layer is set on the top of the filling frame.

[0009] A further technical improvement of the present invention is that: a drive electric push rod is fixed on one side of the filling frame, the output end of the drive electric push rod is fixed to the moving filling strip, a feeding roller is rotatably installed inside the moving filling strip, a traveling gear is rotatably arranged at both ends of the feeding roller, a traveling rack is arranged below each traveling gear, and the traveling rack is fixedly installed on the side wall of the filling frame.

[0010] A further technical improvement of the present invention is that: in the gap between the single powder layer and the bonding powder layer, the piston head pre-compresses the single powder layer.

[0011] A further technical improvement of the present invention is that: the two side walls of the movable filling strip are provided with opening and closing rubber strips that slide up and down, and the bottom of the two side walls of the movable filling strip are fixedly installed with arc-shaped tracks, and the opening and closing rubber strips are in contact with the inner side wall of the arc-shaped tracks under the constraint of the guide structure.

[0012] A further technical improvement of the present invention is that: the guide structure includes fixed rods that are symmetrically and uniformly fixed at their two sides, and a guide block is fixedly installed at the end of each fixed rod. Each fixed rod is arranged in the radial direction of the circumference of the arc track. Limiting grooves are opened on both sides of the opening and closing rubber strip, and each guide block is slidably arranged in the limiting groove.

[0013] A further technical improvement of the present invention is that an opening gap is left between the bottom ends of the two arc-shaped tracks, and two slidingly arranged opening and closing rubber strips control the opening and closing of the opening gap.

[0014] A further technical improvement of the present invention is that a lifting cylinder is fixedly installed on the top of the movable filling strip, and a U-shaped frame is fixed on the output end of the lifting cylinder. The two arms of the U-shaped frame are fixedly connected to the top of the opening and closing rubber strip.

[0015] A further technical improvement of the present invention is that a demolding base is slidably provided at the bottom of the pressing mold, and a breathable membrane is laid in the mold cavity formed by the demolding base and the pressing mold.

[0016] A further technical improvement of the present invention is that heating rods for heating are embedded in both the pressing mold and the demolding base.

[0017] A further technical improvement of the present invention is that: exhaust channels for releasing overflow gas are provided at different heights on the side wall of the pressing mold, and an exhaust channel for exhaust is provided inside the piston head.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The powder is conveyed to the moving filler strip by airflow through the powder conveying pipe. During the movement of the moving filler strip, the feeding rollers feed the powder evenly due to the meshing relationship of the gear and rack. The amount of powder released by each tooth groove is consistent, thus ensuring the uniform filling effect. The symmetrically arranged opening and closing rubber strips effectively and quickly control the opening and closing of the powder feeding port.

[0020] 2. During the powder filling process, the single powder layer is pre-compressed and heated during the pre-compressing process to cause the gas in the powder to expand and accelerate its overflow, thus avoiding a large amount of gas remaining inside the powder and affecting the quality of subsequent products.

[0021] 3. During the powder filling process, since the single powder layer needs to be pre-compressed, in order to prevent the subsequent single powder layers from having loose connections and discontinuities, a bonding powder layer is added between the two single powder layers to increase the tightness of the bond between them, and the final pressing pressure should be much greater than the pre-compressing pressure.

[0022] 4. The presence of the breathable membrane can prevent powder from being lost with the airflow or even blocking the exhaust and outlet channels while the gas is freely discharged. Attached Figure Description

[0023] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0024] Figure 1 This is a schematic diagram showing the overall structural positional relationship of the present invention;

[0025] Figure 2 This is a schematic diagram of the connection structure of the movable filling strip fish filling frame of the present invention;

[0026] Figure 3 For the present invention Figure 1 Enlarged view of details at point A in the middle;

[0027] Figure 4 This is a schematic diagram of the movable filler strip feeding and opening / closing control structure of the present invention.

[0028] In the diagram: 1. Pressing mold; 2. Filling frame; 3. Demolding base; 4. Sealing seat; 5. Powder layer; 6. Breathable membrane; 7. Moving filler strip; 8. Connecting slider; 9. Traveling gear; 10. Traveling rack; 11. Piston head; 12. Drive electric push rod; 13. Connecting seat; 14. Powder conveying pipe; 15. Discharge roller; 16. Opening and closing rubber strip; 17. Arc track; 18. Guide block; 19. Connecting block; 20. U-shaped frame; 21. Lifting cylinder; 101. Exhaust duct; 501. Single powder layer; 502. Combined powder layer; 1101. Air outlet; 1601. Limiting groove. Detailed Implementation

[0029] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided.

[0030] Please see Figure 1-4 As shown, a ceramic powder pressing mold uniform filling device includes a pressing mold 1 for forming, a demolding base 3 that can move up and down is provided inside the pressing mold 1, a sealing seat 4 is fixed at the bottom of the pressing mold 1, and the demolding base 3 and the sealing seat 4 are slidably connected.

[0031] A breathable membrane 6 is laid in the cavity formed by the side wall of the pressing mold 1 and the upper surface of the sealing seat 4, and exhaust channels 101 for releasing overflow gas are opened at different heights on the side wall of the pressing mold 1.

[0032] A filling frame 2 is mounted directly above the pressing mold 1. The four corners of the filling frame 2 are supported and fixed by support columns. The movable end of the breathable membrane 6 is fixed at the bottom of the filling frame 2. A movable filling strip 7 is slidably installed inside the filling frame 2. A connecting seat 13 is fixedly installed on the top of the movable filling strip 7. At least one powder conveying pipe 14 is connected to the top of the connecting seat 13. The movable filling strip 7 has a cavity inside. The powder conveying pipe 14 is connected to the cavity inside the movable filling strip 7 through the connecting seat 13. A lifting cylinder 21 is fixedly installed at the top center of the movable filling strip 7. A U-shaped frame 20 is fixedly connected to the output end of the lifting cylinder 21.

[0033] It should be noted that the function of the powder conveying pipe 14 is to blow the powder into the connecting seat 13 via airflow and then into the moving filler strip 7.

[0034] Both ends of the movable filling strip 7 are rotatably mounted with traveling gears 9 via connecting sliders 8. The connecting sliders 8 are slidably connected to the filling frame 2. The inner cavity of the movable filling strip 7 is rotatably connected with a feeding roller 15. Both ends of the feeding roller 15 pass through the connecting sliders 8 and are fixedly connected to the corresponding traveling gears 9. A traveling rack 10 is provided below each traveling gear 9. The traveling rack 10 is fixed on the side wall of the filling frame 2, and the traveling rack 10 meshes with the traveling gear 9 for transmission. A drive electric push rod 12 is fixedly mounted on one side of the filling frame 2 parallel to the movable filling strip 7. The output end of the drive electric push rod 12 is fixedly connected to the side wall of the movable filling strip 7.

[0035] The movable filler strip 7 has symmetrical grooves on both sides. Arc-shaped tracks 17 are fixedly installed at the bottom of both sides of the movable filler strip 7. Each arc-shaped track 17 is tangent to its corresponding groove. An opening / closing rubber strip 16 is slidably installed within the groove. The top of the opening / closing rubber strip 16 is fixedly connected to the bottom of the U-shaped frame 20 via a connecting block 19. The upper end of the opening / closing rubber strip 16 is positioned within the groove, and the outer side of the lower end of the opening / closing rubber strip 16 is in contact with the inner wall of the arc-shaped track 17. Fixed tracks are evenly distributed on both symmetrical sides of the arc-shaped track 17. Each fixed rod has a guide block 18 fixedly installed at its end. Each fixed rod is set in the radial direction of the circumference of the arc track 17. Limiting grooves 1601 are opened on both sides of the opening and closing rubber strip 16. Each guide block 18 is set in the limiting groove 1601 and is slidably connected to the opening and closing rubber strip 16, thereby constraining the opening and closing rubber strip 16 so that it can move according to the arc of the arc track 17. The outer circumference of the feeding roller 15 is slidably connected to the inner side wall of the opening and closing rubber strip 16 at the maximum diameter.

[0036] Furthermore, an opening gap is left between the ends of the two curved tracks 17 away from the moving filler strip 7, and the opening gap is located directly below the feed roller 15;

[0037] Furthermore, both the pressing mold 1 and the demolding base 3 are embedded with heating rods for heating.

[0038] More specifically, a piston head 11 for pressurizing the powder layer 5 is provided directly above the filling frame 2. The piston head 11 has an exhaust channel 1101 for exhausting air. The powder layer 5 includes a single powder layer 501 and a combined powder layer 502.

[0039] When using this invention, in step one, drive the demolding base 3 to adjust the height of its top surface in the pressing mold 1 to the set position, and blow a certain amount of powder material with a single powder layer 501 into the moving filler strip 7 through the powder conveying pipe 14. At this time, the ends of the symmetrically arranged opening and closing rubber strips 16 contact each other, forming a closed state for the inner cavity of the moving filler strip 7.

[0040] Step 2: After a certain amount of powder material has been blown out, the output end of the lifting cylinder 21 extends, causing the U-shaped frame 20 to rise a certain distance. At this time, the opening and closing rubber strip 16, which is fixedly connected to the U-shaped frame 20, slides upward, and maintains contact with the inner wall of the arc-shaped track 17 throughout the sliding process. The sliding process stops when the bottom end of the opening and closing rubber strip 16 is flush with the bottom end of the arc-shaped track 17, thus releasing the sealing state of the opening gap by the two opening and closing rubber strips 16. At the same time, the drive electric actuator 12 is activated, and the output end of the drive electric actuator 12 pushes... The movable filling strip 7 slides relative to the filling frame 2. The traveling gears 9 at both ends of the movable filling strip 7 mesh with the traveling rack 10 for transmission. The traveling gears 9 are in a traveling and rotating state, thereby driving the feeding roller 15 to rotate. The tooth grooves on the surface of the feeding roller 15 drive the material to be evenly spread on the breathable membrane 6. When all the powder material in the movable filling strip 7 is spread, a single powder layer 501 with a thickness of H1 is formed, so that the movable filling strip 7 returns to the initial position, and the output end of the lifting cylinder 21 retracts. The two opening and closing rubber strips 16 re-close the opening gap.

[0041] Step 3: The piston head 11 descends to pre-compress the single powder layer 501. The pre-compressing pressure is set to F1. During the pre-compressing process, heating rods are installed in the pressing mold 1 and the demolding base 3 for heating. Under the dual action of pre-compressing pressure and heating, the gas in the single powder layer 501 overflows from the powder voids and is discharged into the exhaust channel 101 and the air outlet channel 1101 respectively.

[0042] Step 4: Disconnect the power supply to the heating rod and release the pre-compression state. Repeat Step 2 to lay the powder material of the bonding powder layer 502 on top of the single powder layer 501. The powder material of the bonding powder layer 502 contains a binder, forming a bonding powder layer 502 with a thickness of H2. It should be noted that the thickness of the bonding powder layer 502 is less than the thickness of the single powder layer 501, i.e., H2.

[0043] Step 5: Continue to repeat step 2, blowing a certain amount of powder material for laying a single powder layer 501 into the moving filler strip 7 through the powder conveying pipe 14, and then repeat step 3; repeat this process until the entire laying process is completed.

[0044] Step Six: The piston head 11 descends to perform final pressing on the laid powder layer 5. The pressure is set to F2, which is greater than F1. During the pressing process, the heating rods embedded in the pressing mold 1 and the demolding base 3 play a role in accelerating the gas overflow rate during the pressing process, maximizing the discharge of internal gas and improving the quality of subsequent products. After pressing is completed, the piston head 11 moves up to the initial position, and the demolding base 3 moves upward until the shoulder on the demolding base 3 contacts the bottom of the sealing seat 4. The worker then completes the unloading of the pressed finished product.

[0045] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.​

Claims

1. A ceramic powder pressing mold uniform filling device, comprising a pressing mold (1), characterized in that, A filling frame (2) is mounted directly above the pressing mold (1). A moving filling strip (7) is reciprocating inside the filling frame (2). During the reciprocating movement, the moving filling strip (7) fills the pressing mold (1) with a powder layer (5). The powder layer (5) includes a single powder layer (501) and a combined powder layer (502). A piston head (11) for pressing the powder layer (5) is mounted directly above the filling frame (2). In the gap between the single powder layer (501) and the bonding powder layer (502), the piston head (11) pre-compresses the single powder layer (501); The movable filling strip (7) is rotatably installed with a feeding roller (15), and the two ends of the feeding roller (15) are rotatably provided with a traveling gear (9). A traveling rack (10) is provided below each traveling gear (9), and the traveling rack (10) is fixedly installed on the side wall of the filling frame (2). The two side walls of the movable filling strip (7) are slidably provided with opening and closing rubber strips (16), and the bottom of the two side walls of the movable filling strip (7) is fixedly installed with an arc track (17). The opening and closing rubber strip (16) is in contact with the inner side wall of the arc track (17) under the constraint of the guide structure. An opening gap is left between the bottom ends of the two arc tracks (17), and the two slidably provided opening and closing rubber strips (16) control the opening and closing of the opening gap. The bottom of the pressing mold (1) is provided with a demolding base (3) that slides up and down. The mold cavity formed by the demolding base (3) and the pressing mold (1) is covered with a breathable membrane (6). The side wall of the pressing mold (1) is provided with exhaust channels (101) at different heights for releasing overflow gas. The piston head (11) is provided with an exhaust channel (1101) for exhausting gas.

2. The ceramic powder pressing mold uniform filling device according to claim 1, characterized in that, A drive electric actuator (12) is fixed on one side of the filling frame (2), and the output end of the drive electric actuator (12) is fixed to the moving filling strip (7).

3. The ceramic powder pressing mold uniform filling device according to claim 1, characterized in that, The guide structure includes fixed rods that are symmetrically and uniformly fixed on both sides. Each fixed rod has a guide block (18) fixedly installed at its end. Each fixed rod is set in the radial direction of the circumference of the arc track (17). The opening and closing rubber strip (16) has a limit groove (1601) on both sides. Each guide block (18) is slidably set in the limit groove (1601).

4. The ceramic powder pressing mold uniform filling device according to claim 1, characterized in that, A lifting cylinder (21) is fixedly installed on the top of the movable filling strip (7), and a U-shaped frame (20) is fixed on the output end of the lifting cylinder (21). The two arms of the U-shaped frame (20) are fixedly connected to the top of the opening and closing rubber strip (16).

5. The ceramic powder pressing mold uniform filling device according to claim 1, characterized in that, Heating rods for heating are embedded in both the pressing mold (1) and the demolding base (3).

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