Powder spreading method and powder spreading system of zirconia ceramic block dry press for all-ceramic false tooth

Abstract

The invention discloses a powder spreading method and a powder spreading system of a zirconia ceramic block dry press for all-ceramic false teeth. The powder spreading method comprises the following steps: pouring quantitatively weighed zirconia powder into a pressing chamber; a powder spreading device is inserted into the material pressing cavity according to the first preset depth; the powder spreading device comprises a motor and a push plate which are sequentially connected in the longitudinal direction. The motor is used for driving the push plate to rotate with the center line of the pressing cavity as the axis. A motor is started to drive a push plate to rotate forwards, and first-time flattening is completed; the powder spreading device is lifted according to a second preset depth; the motor is started to drive the push plate to rotate reversely, and second-time flattening is completed; and the powder spreading device is withdrawn from the material pressing cavity. And through two-time flattening operation, the zirconium oxide powder in the material pressing cavity is uniformly flattened, so that the situation of local accumulation or local powder shortage is reduced, and the quality of dry pressing processing is favorably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of denture manufacturing, and particularly to a powder spreading method and a powder spreading system for a zirconia ceramic block dry press for all-ceramic dentures. Background Art

[0002] All-ceramic dentures have become the mainstream choice for modern dental restorations due to their high strength, excellent aesthetics, and biocompatibility. During the production of all-ceramic dentures, zirconia powder needs to be dry-pressed and then sintered to obtain high-strength zirconia ceramic blocks, and the weights of different types of ceramic blocks vary from 100 to 900 grams. Compared with wet forming methods (such as slip casting, gel casting, etc.), dry pressing has the advantages of high efficiency, low cost, and good product consistency.

[0003] During the dry pressing process, due to high precision requirements, it is necessary to keep the weight of each ceramic block as consistent as possible, and the powder must be evenly spread in the mold before being pressed, otherwise uneven stress will occur and the expected ceramic block cannot be formed. Therefore, in the current production process, before pressing the ceramic block, it is generally necessary to level the powder manually.

[0004] However, the stability of manual operation is insufficient, and the leveling effect cannot be guaranteed, resulting in unstable processing quality of the product.

[0005] Therefore, the prior art still needs to be improved and developed. Summary of the Invention

[0006] In view of the above deficiencies of the prior art, the purpose of the present invention is to provide a powder spreading method and a powder spreading system for a zirconia ceramic block dry press for all-ceramic dentures, aiming to solve the problem of unstable processing quality caused by manually leveling zirconia powder during the processing of existing zirconia ceramic blocks.

[0007] The technical solution of the present invention is as follows:

[0008] A powder spreading method for a zirconia ceramic block dry press for all-ceramic dentures, which includes:

[0009] Pour the quantitatively weighed zirconia powder into the pressing chamber;

[0010] Insert the powder spreader into the pressing chamber according to a first preset depth; wherein, the powder spreader includes a motor and a push plate longitudinally connected in sequence, and the motor is used to drive the push plate to rotate around the center line of the pressing chamber;

[0011] Start the motor to drive the push plate to rotate forward to complete the first leveling;

[0012] Raise the powder spreader according to a second preset depth;

[0013] Start the motor to drive the push plate to reverse and complete the second leveling.

[0014] Withdraw the powder spreading device from the material pressing chamber.

[0015] For the powder spreading method of the zirconia ceramic block dry press for all-ceramic dentures, wherein the difference between the first preset depth and the second preset depth is the error threshold, and the error threshold is 0.3 - 0.5 mm.

[0016] For the powder spreading method of the zirconia ceramic block dry press for all-ceramic dentures, wherein the zirconia ceramic block dry press for all-ceramic dentures includes a mold and an extrusion head arranged oppositely, and the mold is provided with the material pressing chamber; the extrusion head can move towards the material pressing chamber for extruding zirconia powder; after the step of withdrawing the powder spreading device from the material pressing chamber, the following steps are further included:

[0017] Move the extrusion head to the material pressing chamber to complete single-layer dry pressing.

[0018] For the powder spreading method of the zirconia ceramic block dry press for all-ceramic dentures, wherein after the step of moving the extrusion head to the material pressing chamber to complete single-layer dry pressing, the following steps are further included:

[0019] Withdraw the extrusion head from the material pressing chamber;

[0020] Pour the quantitatively weighed two-layer zirconia powder into the material pressing chamber;

[0021] Insert the powder spreading device into the material pressing chamber according to the third preset depth;

[0022] Start the motor to drive the push plate to rotate forward to complete the third leveling;

[0023] Raise the powder spreading device according to the fourth preset depth;

[0024] Start the motor to drive the push plate to reverse to complete the fourth leveling;

[0025] Withdraw the powder spreading device from the material pressing chamber and move the extrusion head to the material pressing chamber to complete multi-layer dry pressing.

[0026] For the powder spreading method of the zirconia ceramic block dry press for all-ceramic dentures, wherein the material pressing chamber is a circular chamber, the push plate includes a central connection end and an edge contact end, the central connection end is connected to the output shaft of the motor and can extend into the center of the material pressing chamber; the edge contact end can fit the side wall of the material pressing chamber and rotate around the output shaft of the motor.

[0027] The powder spreading method of the zirconia ceramic block dry press for all-ceramic dentures, wherein the pushing plate includes a powder pushing part between the central connection end and the edge contact end, and the shape of the powder pushing part is arc-shaped or zigzag-shaped.

[0028] The powder spreading method of the zirconia ceramic block dry press for all-ceramic dentures, wherein the shape of the pushing plate is S-shaped, and the length value of the pushing plate is equal to the diameter value of the material pressing chamber.

[0029] This application also discloses a powder spreading system of the zirconia ceramic block dry press for all-ceramic dentures, which is used to implement the powder spreading method of the zirconia ceramic block dry press for all-ceramic dentures as described above; wherein, it includes:

[0030] A feeding module, which is used to weigh zirconia powder and transport the zirconia powder to the material pressing chamber;

[0031] A moving module, which is connected to the powder spreader and is used to move the powder spreader into or out of the material pressing chamber;

[0032] A control module, which is electrically connected to the feeding module, the moving module, and the powder spreader.

[0033] The powder spreading system of the zirconia ceramic block dry press for all-ceramic dentures, wherein the moving module includes:

[0034] A lifting slide rail, and the extending direction of the lifting slide rail is the same as the depth direction of the material pressing chamber;

[0035] A lifting structure, which is slidably arranged on the lifting slide rail;

[0036] A transverse movement slide rail, which is arranged on the lifting structure; the extending direction of the transverse movement slide rail is perpendicular to the depth direction of the material pressing chamber;

[0037] A transverse movement structure, which is slidably arranged on the transverse movement slide rail;

[0038] Wherein, the powder spreader is arranged on the transverse movement structure.

[0039] The powder spreading system of the zirconia ceramic block dry press for all-ceramic dentures, wherein the depth value of the material pressing chamber is less than or equal to the sliding stroke of the lifting structure.

[0040] Compared with the prior art, the embodiments of the present invention have the following advantages:

[0041] When the zirconia ceramic block dry press for all-ceramic dentures disclosed in the present invention is processed, first calculate the dosage of zirconia powder according to the processing requirements, then quantitatively weigh the zirconia powder and add it to the material pressing chamber. By inserting the powder spreading device into the material pressing chamber, two powder spreading operations with different heights and different rotation directions are carried out, so as to evenly spread the zirconia powder, reduce the situation of local accumulation or local material shortage, which is beneficial to dry pressing and sintering into a zirconia ceramic block with regular shape and qualified quality in the subsequent process, and improve the production quality of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0043] Figure 1 It is a flowchart of the powder spreading method of the zirconia ceramic block dry press for all-ceramic dentures in the present invention;

[0044] Figure 2 It is a schematic structural diagram of the zirconia ceramic block dry press for all-ceramic dentures in the present invention;

[0045] Figure 3 It is a schematic structural diagram of the powder spreading device in the present invention;

[0046] Figure 4 It is a schematic structural diagram of the push plate in an embodiment of the present invention.

[0047] Among them, 10, mold; 11, material pressing chamber; 20, extrusion head; 30, powder spreading device; 31, motor; 32, push plate; 321, central connection end; 322, edge contact end; 323, powder pushing part; 40, lifting slide rail; 50, lifting structure; 60, transverse slide rail; 70, transverse moving structure. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0048] In order to enable those skilled in the art to better understand the solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0049] Due to manufacturing techniques and / or tolerances, variations in the shapes shown in the drawings may occur. Accordingly, the examples described herein are not limited to the specific shapes shown in the drawings, but include changes in shape that occur during manufacturing.

[0050] As used herein, the term "and / or" includes any one of the listed related items and any combination of any two or more of them.

[0051] Although terms such as "first", "second", and "third" may be used herein to describe various components, assemblies, regions, layers, or sections, these components, assemblies, regions, layers, or sections are not limited by these terms. Rather, these terms are only used to distinguish one component, assembly, region, layer, or section from another. Thus, a first component, assembly, region, layer, or section described in the examples herein may also be referred to as a second component, assembly, region, layer, or section without departing from the teachings of the examples.

[0052] For ease of description, spatial relationship terms such as "on", "upper", "under", and "lower" may be used herein to describe the relationship of one element to another as shown in the drawings. Such spatial relationship terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the drawings. For example, if the device in the drawings is flipped, an element described as "on" or "upper" relative to another element will subsequently be "under" or "lower" relative to another element. Thus, the term "on" includes both the orientations of "on" and "under" depending on the spatial orientation of the device. The device may also be positioned in other ways, and the spatial relationship terms used herein will be interpreted accordingly.

[0053] The terms used herein are for the purpose of describing various examples only and are not intended to limit the disclosure. Unless the context clearly dictates otherwise, the singular forms are also intended to include the plural forms. The terms "comprises", "comprising", and "having" list the stated features, quantities, operations, components, elements, and / or combinations thereof that exist, but do not preclude the existence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0054] Refer to Figure 1 and Figure 2 , in an embodiment of the present invention application, a powder spreading method for a zirconia ceramic block dry press for all-ceramic dentures is disclosed, wherein it includes:

[0055] S10. Pour the quantitatively weighed zirconia powder into the material pressing chamber 11.

[0056] The zirconia dry pressing technology is a forming process used to prepare high-density zirconia ceramic blocks. The zirconia powder is pressed into a preformed ceramic block with high density through mechanical pressure. During the processing, the weight of the ceramic block is required to be between 100 - 900 grams, and the weight error of each block should be less than 0.5 grams. The zirconia ceramic block dry press for all-ceramic dentures disclosed in this embodiment forms a material pressing chamber 11 by grooving on the mold 10, and according to the size requirements of the product, the size of the zirconia ceramic block can be calculated, as well as the amount of zirconia powder required to make the zirconia ceramic block. Then, based on the previous calculation, the zirconia powder is quantitatively weighed, thus reasonably saving material costs and precisely controlling the amount of zirconia used, which is beneficial to improving the production accuracy of the product.

[0057] Specifically, in this embodiment, the material pressing chamber 11 can be formed on the mold 10, and the mold 10 is made of a high-strength alloy material, such as stainless steel. Correspondingly, an extrusion head 20 can be arranged corresponding to the mold 10, and moving the extrusion head 20 to the material pressing chamber 11 can dry press the zirconia powder. Of course, during the powder spreading stage, the extrusion head 20 is first moved out of the material pressing chamber 11 to facilitate feeding.

[0058] S20: Insert the powder spreader 30 into the material pressing chamber 11 according to the first preset depth.

[0059] As Figure 3 shown, the powder spreader 30 disclosed in this embodiment includes a motor 31 and a push plate 32 connected longitudinally in sequence. The motor 31 is used to drive the push plate 32 to rotate around the center line of the material pressing chamber 11. When the push plate 32 is sent into the material pressing chamber 11 until it is inserted into the zirconia powder pile, when the push plate 32 rotates, it will push the zirconia powder to move, and with the action of centrifugal force, the zirconia powder at a higher position is pushed to a lower position, thus achieving a leveling effect.

[0060] Specifically, the first preset depth disclosed in this embodiment is set according to the size of the mold 10 and the size of the target zirconia ceramic block to be manufactured. For example, if the depth of the material pressing chamber 11 on the mold 10 is 5 mm and the thickness of the zirconia ceramic block to be manufactured is 2 mm, then the first preset depth can be set to 3 mm, that is, the push plate 32 is inserted 3 mm into the material pressing chamber 11. At this time, the bottom end of the push plate 32 is 2 mm away from the bottom surface of the material pressing chamber 11. The push plate 32 rotates at this height, and can push away the part higher than 2 mm on the zirconia powder pile and push it to the position where the height is less than 2 mm, so that the thickness of the zirconia powder pile in the material pressing chamber 11 tends to be consistent, and the surface of the zirconia powder pile tends to be flat, facilitating subsequent dry pressing.

[0061] As Figure 3As shown in the figure, in this embodiment, the drive shaft of the motor 31 can be moved to align with the center position of the material pressing chamber 11. The width of the push plate 32 can be set to one-half of the diameter of the material pressing chamber 11. One end of the push plate 32 is fixed to the drive shaft of the motor 31, and the other end can approach the side wall of the material pressing chamber 11. Thus, during the rotation process, the entire material pile can be covered, and the material pile formed by the zirconia powder can be leveled. As Figure 4 shown, in another implementation manner of this embodiment, the width of the push plate 32 can be set to be equal to the diameter of the material pressing chamber 11. The drive shaft of the motor 31 is connected to the middle of the push plate 32. In this way, when rotating, the push plate 32 can push the zirconia powder more efficiently, improving the working efficiency.

[0062] It should be noted that the above only exemplifies two sizes of the push plate 32, but the protection scope of the present invention is not limited thereto. As long as the push plate 32 of other sizes can achieve the technical effects disclosed in this application and is an equivalent replacement of the inventive concept, it should also be within the protection scope of this application.

[0063] S30. Start the motor 31 to drive the push plate 32 to rotate forward to complete the first leveling.

[0064] After the powder spreading device 30 is moved in place, control the motor 31 to start and drive the push plate 32 to rotate, so that it can sweep at a fixed height. If the material pile composed of zirconia powder is uneven, there will be "protrusions" and "depressions" on the upper surface of the zirconia material pile. The zirconia powder at the "protrusion" position is pushed to the "depression" position by the push plate 32, removing the "protrusion" and filling the "depression", thereby completing the first leveling operation.

[0065] However, due to the inevitable processing errors in the mechanized processing process. For example, when pressing a 2-mm-thick zirconia ceramic block in a 5-mm-deep material pressing chamber 11, when the powder spreading device 30 is moved into the material pressing chamber 11 through a mechanical structure, there may be a mechanical error of plus or minus 0.036 mm; affected by gravity, the thickness of the zirconia powder piled up together may have an error of plus or minus 0.05 mm from the preset thickness; in addition, during the subsequent dry pressing process, the extrusion head 20 and the mold 10 approach each other, and the moving distance of the extrusion head 20 is controlled by an encoder, and there may also be an error of about plus or minus 0.15 mm.

[0066] In summary, during the dry pressing process, the actual thickness of the zirconia material pile may deviate slightly from the preset thickness, posing a risk of abnormal product quality. Due to processing errors, after the first leveling, the upper surface of the zirconia material pile may not be completely flat, with residual "protrusions". For example, the preset height of the zirconia material pile is 2 mm, but due to the powder spreading device 30 descending more than 0.02 mm, the thickness of the zirconia material pile after the first leveling is 1.98 mm; however, the weight of the zirconia powder added to the pressing chamber 11 is calculated based on a 2-mm-thick zirconia material pile. Therefore, in this case, excess zirconia powder will accumulate locally.

[0067] S40. Raise the powder spreading device 30 according to the second preset depth.

[0068] After the first leveling, ideally, the zirconia material pile should have been leveled. However, in actual operation, due to various errors, secondary leveling is still required to improve the quality of the final product. Therefore, in this embodiment, the powder spreading device 30 is appropriately raised to facilitate the secondary leveling operation.

[0069] Specifically, the second preset depth disclosed in this embodiment should take into account the processing error and the acceptable thickness error of the zirconia ceramic block, and appropriately raise the powder spreading device 30 to continue leveling the accumulated zirconia powder, while avoiding not being able to reach the zirconia powder because it is raised too high.

[0070] S50. Start the motor 31 to drive the push plate 32 to reverse, and complete the second leveling.

[0071] During the second leveling, by rotating the push plate 32 in the reverse direction, the accumulated zirconia powder is pushed in the reverse direction, so as to better fill the "depressed" positions, complete the second leveling, and further improve the flatness of the surface of the zirconia powder.

[0072] S60. Withdraw the powder spreading device 30 from the pressing chamber 11.

[0073] After the powder spreading is completed, withdraw the powder spreading device 30 in time to facilitate subsequent dry pressing and avoid interfering with the extrusion head 20 entering the pressing chamber 11.

[0074] In summary, when processing the zirconia ceramic block for all-ceramic dentures disclosed in this embodiment, first calculate the amount of zirconia powder according to the processing requirements, then quantitatively weigh the zirconia powder and add it to the pressing chamber 11. By inserting the powder spreading device 30 into the pressing chamber 11, two leveling operations with different heights and different rotation directions are performed to evenly spread the zirconia powder, reduce the situation of local accumulation or local lack of material, which is beneficial for dry pressing and sintering into a zirconia ceramic block with regular shape and qualified quality in the subsequent process, and improve the production quality of the product.

[0075] Specifically, as another implementation manner of this embodiment, it is disclosed that the difference between the first preset depth and the second preset depth is an error threshold, and the error threshold is 0.3 - 0.5 millimeters. The error threshold disclosed in this embodiment is the height by which the powder spreading device 30 rises, that is, the height difference between the positions of the first leveling and the second leveling. By raising the powder spreading device 30 for secondary leveling, the error tolerance of the leveling operation is increased, and the negative impact of mechanical errors is reduced.

[0076] Therefore, the error threshold should be set according to the error range of the device and the range of manufacturing errors allowed for the product. When the error threshold is too small, it cannot eliminate mechanical errors. When the error threshold is too large, the powder spreading device 30 leaves the surface of the zirconia powder and cannot play a leveling role. Therefore, the error threshold set in this embodiment can be any value between 0.3 - 0.5 millimeters or the range between any two values, such as 0.3 millimeters, 0.35 millimeters, 0.37 millimeters, 0.4 millimeters, 0.45 millimeters, 0.5 millimeters, etc. Preferably, it is 0.4 millimeters. At this time, the height difference between the first leveling and the second leveling is less than 0.4 millimeters, meeting the production requirements of the zirconia ceramic block.

[0077] Again, Figure 2 As shown, as another implementation manner of this embodiment, it is disclosed that the dry press for zirconia ceramic blocks for all-ceramic dentures includes a mold 10 and an extrusion head 20 arranged oppositely, and a material pressing chamber 11 is provided on the mold 10; the extrusion head 20 can move towards the material pressing chamber 11 for extruding zirconia powder; after the step S60, the following steps are further included:

[0078] S70. Move the extrusion head 20 to the material pressing chamber 11 to complete single-layer dry pressing.

[0079] After the zirconia powder is leveled, the extrusion head 20 is sent into the material pressing chamber 11 for dry pressing, and the entire processing process is automated, with high operation accuracy and high processing efficiency. Specifically, in this embodiment, the extrusion head 20 can be arranged directly above the mold 10, the material pressing chamber 11 is arranged vertically, and the extrusion head 20 moves from top to bottom to perform dry pressing on the zirconia powder, with stable pressure, and the dry pressing effect can be ensured by virtue of the self-weight of the extrusion head 20.

[0080] Specifically, as another implementation manner of this embodiment, it is disclosed that after the step S70, the following steps are further included:

[0081] S80. Withdraw the extrusion head 20 from the material pressing chamber 11;

[0082] S90. Pour the quantitatively weighed second layer of zirconia powder into the material pressing chamber 11;

[0083] S100. Insert the powder spreading device 30 into the material pressing chamber 11 to the third preset depth;

[0084] S110. Start the motor 31 to drive the push plate 32 to rotate forward to complete the third leveling;

[0085] S120. Raise the powder spreading device 30 to the fourth preset depth;

[0086] S130. Start the motor 31 to drive the push plate 32 to rotate reversely to complete the fourth leveling;

[0087] S140. Withdraw the powder spreading device 30 from the material pressing chamber 11 and move the extrusion head 20 to the material pressing chamber 11 to complete multi-layer dry pressing.

[0088] The zirconia ceramic block for all-ceramic dentures may be single-layer or multi-layer. According to the usage requirements, when a multi-layer zirconia ceramic block needs to be fabricated, after the single-layer dry pressing is completed, the zirconia ceramic block does not need to be taken out directly. Instead, the second-layer zirconia powder is added to the material pressing chamber 11, and the third and fourth leveling operations are continued. Then, dry pressing is performed again through the extrusion head 20 to fabricate a two-layer-structured zirconia ceramic block. This has high processing efficiency, and leveling operations are also carried out when making the second layer, further improving the dry pressing quality of the product, making the density of the zirconia ceramic block uniform and the thickness meet the standards, and the production quality of the product is high.

[0089] It should be noted that this embodiment only exemplifies the powder spreading and processing process of a two-layer-structured zirconia ceramic block. In actual production, there may be requirements for more layers of zirconia ceramic blocks. Only by repeating the above steps S90 - S140 can multiple layers of zirconia powder be stacked and pressed to meet the product production needs.

[0090] As Figure 2 and Figure 3 shown, as another implementation manner of this embodiment, it is disclosed that the material pressing chamber 11 is a circular chamber, the push plate 32 includes a central connection end 321 and an edge contact end 322. The central connection end 321 is connected to the output shaft of the motor 31 and can extend into the center of the material pressing chamber 11; the edge contact end 322 can fit against the side wall of the material pressing chamber 11 and rotate around the output shaft of the motor 31.

[0091] In this embodiment, the pressing chamber 11 disclosed is circular, which is beneficial to manufacturing circular zirconia ceramic blocks and convenient for processing. In addition, when the powder spreading device 30 extends into the pressing chamber 11, the motor 31 drives the push plate 32 to rotate. The central connection end 321 of the push plate 32 is located at the center of the pressing chamber 11, and the edge contact end 322 is located at the edge of the pressing chamber 11. That is to say, the push plate 32 extends from the center to the edge of the pressing chamber 11, and the trajectory of the push plate 32 during rotation covers the entire pressing chamber 11. Therefore, the leveling effect is good.

[0092] It should be noted that the motor 31 disclosed in this embodiment includes but is not limited to a stepping motor, and the push plate 32 can be controlled by the motor 31 to rotate forward and backward.

[0093] Another example Figure 3 As shown, as another implementation manner of this embodiment, the push plate 32 is disclosed to include a powder pushing portion 323 between the central connection end 321 and the edge contact end 322, and the shape of the powder pushing portion 323 is arc-shaped or zigzag.

[0094] In this embodiment, the shape of the powder pushing portion 323 is set to be arc-shaped or zigzag, and there is a certain angle between the surface of the powder pushing portion 323 and the radial direction of the pressing chamber 11. Therefore, when the push plate 32 rotates in the pressing chamber 11, the thrust generated on the surface of the powder pushing portion 323 has both a component force along the radial direction of the pressing chamber 11 and a thrust along the circumferential direction of the pressing chamber 11. Therefore, in addition to pushing the zirconia powder along the circumferential direction, the push plate 32 can also push the zirconia powder towards the center or the edge of the pressing chamber 11. On this basis, through two leveling operations and reverse pushing, the zirconia powder can move back and forth between the center and the edge of the pressing chamber 11 until it is evenly spread.

[0095] In summary, setting the powder pushing portion 323 to be arc-shaped or zigzag further increases the degree of dispersion of the zirconia powder, enables the zirconia powder to quickly move to any position in the pressing chamber 11 during the leveling process, has a better dispersion effect, and further increases the surface flatness of the zirconia material pile.

[0096] For example Figure 4 As shown, as another implementation manner of this embodiment, the shape of the push plate 32 is disclosed to be S-shaped, and the length value of the push plate 32 is equal to the diameter value of the pressing chamber 11. In this embodiment, the middle part of the push plate 32 is connected to the motor 31, and both ends extend to the opposite side edges of the pressing chamber 11. Therefore, the area swept during rotation is large. Only by rotating 180°, a complete sweep of the upper surface of the zirconia material pile can be performed, thereby improving the leveling efficiency and being beneficial to shortening the powder spreading time.

[0097] It should be understood that each part of the present application can be implemented by hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. If implemented by hardware, as in another embodiment, any one of the following techniques well known in the art or a combination thereof can be used: discrete logic circuits having logic gate circuits for implementing logical functions on data signals, application specific integrated circuits having appropriate combinational logic gate circuits, programmable gate arrays, field programmable gate arrays, and the like.

[0098] In addition, in each embodiment of the present application, each functional unit can be integrated into a processing module, can exist physically separately for each unit, or two or more units can be integrated into one module. The above integrated module can be implemented in the form of hardware or in the form of a software functional module. When the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0099] As another embodiment of the present application, a powder spreading system for a zirconia ceramic block dry press for all-ceramic dentures is disclosed, which is used to implement the powder spreading method of the zirconia ceramic block dry press for all-ceramic dentures as described above; wherein, it includes a feeding module, a moving module, and a control module. The feeding module is used to weigh zirconia powder and transport the zirconia powder to the pressing chamber 11; the moving module is connected to the powder spreader 30 and is used to move the powder spreader 30 into or out of the pressing chamber 11; the control module is electrically connected to the feeding module, the moving module, and the powder spreader 30.

[0100] In this embodiment, the feeding module can use structures such as a robotic arm or a conveyor belt to send the weighed zirconia powder into the pressing chamber 11 to achieve automated feeding operations; the moving module can use a combination of a lifting guide rail and a slider, or conveyor belt transportation, or a robotic arm clamping method to move the powder spreader 30, send the powder spreader 30 into the pressing chamber 11, and move it out after the work is completed; the control module controls the start of the powder spreader 30 through wires or wireless communication. Specifically, it controls parameters such as the rotation direction, output power, and working time of the motor 31, so as to precisely control the time and effect of the leveling operation.

[0101] It can be seen that the powder spreading system of the zirconia ceramic block dry press for all-ceramic dentures disclosed in this embodiment levels the zirconia material pile before dry pressing, increases the surface flatness, reduces the problems of local material shortage or local overfeeding, improves the production quality of the zirconia ceramic block, and meets the density requirements and size requirements of the product.

[0102] Another example is Figure 2As shown, as another implementation manner of this embodiment, it is disclosed that the moving module includes a lifting slide rail 40, a lifting structure 50, a transverse slide rail 60, and a transverse moving structure 70. The extending direction of the lifting slide rail 40 is the same as the depth direction of the material pressing chamber 11; the lifting structure 50 is slidably arranged on the lifting slide rail 40; the transverse slide rail 60 is arranged on the lifting structure 50; the extending direction of the transverse slide rail 60 is perpendicular to the depth direction of the material pressing chamber 11; the transverse moving structure 70 is slidably arranged on the transverse slide rail 60; and the powder spreading device 30 is arranged on the transverse moving structure 70.

[0103] In this embodiment, by setting the lifting slide rail 40 and the transverse slide rail 60 to control the flexible movement of the powder spreading device 30 in the vertical plane, the powder spreading device 30 can first move horizontally above the material pressing chamber 11 and then descend into the material pressing chamber 11 for work. After the work is completed, it retreats step by step to perform the powder spreading work in an orderly manner, improving the operation efficiency and having high control precision, which is beneficial to improving the production quality of products.

[0104] Specifically, as another implementation manner of this embodiment, it is disclosed that the depth value of the material pressing chamber 11 is less than or equal to the sliding stroke of the lifting structure 50. In this embodiment, the sliding stroke of the lifting structure 50 is long, which can control the powder spreading device 30 to extend to the bottom surface of the material pressing chamber 11 or move the powder spreading device 30 outside the material pressing chamber 11, so as to smoothly move the powder spreading device 30 away and avoid interfering with the subsequent dry-pressed workpiece.

[0105] In summary, the present application discloses a powder spreading method for a zirconia ceramic block dry press for all-ceramic dentures, which includes: pouring the quantitatively weighed zirconia powder into the material pressing chamber 11; inserting the powder spreading device 30 into the material pressing chamber 11 according to a first preset depth; starting the motor 31 to drive the push plate 32 to rotate forward to complete the first leveling; raising the powder spreading device 30 according to a second preset depth; starting the motor 31 to drive the push plate 32 to rotate in reverse to complete the second leveling; and withdrawing the powder spreading device 30 from the material pressing chamber 11. Wherein, the powder spreading device 30 includes a motor 31 and a push plate 32 connected longitudinally in sequence, and the motor 31 is used to drive the push plate 32 to rotate around the center line of the material pressing chamber 11. By inserting the powder spreading device 30 into the material pressing chamber 11 and performing two leveling operations with different heights and different rotation directions, the zirconia powder is evenly spread, reducing the situation of local accumulation or local lack of material, which is beneficial to dry-pressing and sintering into a zirconia ceramic block with regular shape and qualified quality in the subsequent process, and improving the production quality of products.

[0106] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0107] It should be noted that the present invention takes the powder spreading method and powder spreading system of the zirconia ceramic block dry press for all-ceramic dentures as an example to introduce the specific structure and working principle of the present invention. However, the application of the present invention is not limited to the powder spreading method and powder spreading system of the zirconia ceramic block dry press for all-ceramic dentures, and can also be applied to the production and use of other similar workpieces.

[0108] It should be understood that the present invention is not limited to the precise structure already described and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present invention is only limited by the appended claims.

[0109] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A powder spreading method of a zirconia ceramic block dry press for all-ceramic dentures, characterized in that: include: Pour a quantitative amount of zirconium oxide powder into the pressing chamber; Inserting a powder spreader into the material pressing chamber according to a first preset depth; wherein the powder spreader comprises a motor and a push plate connected in sequence longitudinally, and the motor is used to drive the push plate to rotate with the center line of the material pressing chamber as the axis; Starting the motor to drive the push plate to rotate forward to complete the first paving; Raise the powder spreader according to a second preset depth; Starting the motor to drive the push plate to reverse and complete the second paving; The powder spreader is withdrawn from the material pressing chamber.

2. The powder spreading method of the zirconia ceramic block dry pressing machine for all-ceramic denture according to claim 1 is characterized in that: The difference between the first preset depth and the second preset depth is an error threshold, and the error threshold is 0.3-0.5 mm.

3. The powder spreading method of the zirconia ceramic block dry pressing machine for all-ceramic denture according to claim 1 is characterized in that: The dry pressing machine for zirconium oxide ceramic blocks for all-ceramic dentures comprises a mold and an extrusion head arranged opposite to each other, the mold is provided with the pressing chamber; the extrusion head can move toward the pressing chamber to extrude zirconium oxide powder; after the step of withdrawing the powder spreader from the pressing chamber, the machine further comprises: The extrusion head is moved to the pressing chamber to complete single-layer dry pressing.

4. The powder spreading method of the zirconia ceramic block dry pressing machine for all-ceramic denture according to claim 3 is characterized in that: After the step of moving the extrusion head to the material pressing chamber and completing the single-layer dry pressing, the method further includes: withdrawing the extrusion head from the material pressing chamber; Pour a quantitatively weighed two-layer zirconia powder into the pressing chamber; Inserting the powder spreader into the material pressing chamber according to a third preset depth; Starting the motor to drive the push plate to rotate forward to complete the third paving; Raising the powder spreader according to a fourth preset depth; Starting the motor to drive the push plate to reverse and complete the fourth paving; The powder spreader is withdrawn from the pressing chamber, and the extrusion head is moved to the pressing chamber to complete multi-layer dry pressing.

5. The powder spreading method of the zirconia ceramic block dry pressing machine for all-ceramic denture according to claim 1, characterized in that: The pressing chamber is a circular chamber, and the push plate includes a central connecting end and an edge contact end. The central connecting end is connected to the output shaft of the motor and can extend into the center of the pressing chamber; the edge contact end can fit the side wall of the pressing chamber and rotate around the output shaft of the motor.

6. The powder spreading method of the zirconia ceramic block dry pressing machine for all-ceramic denture according to claim 5, characterized in that: The push plate comprises a powder pushing portion between the central connecting end and the edge contact end, and the powder pushing portion is in an arc shape or a broken line shape.

7. The powder spreading method of the zirconia ceramic block dry pressing machine for all-ceramic denture according to claim 1, characterized in that: The push plate is in an S shape, and the length of the push plate is equal to the diameter of the material pressing chamber.

8. A powder spreading system for a zirconia ceramic block dry pressing machine for all-ceramic dentures, used to implement the powder spreading method for a zirconia ceramic block dry pressing machine for all-ceramic dentures as claimed in any one of claims 1 to 7; characterized in that: include: A feeding module, used for weighing zirconium oxide powder and transporting the zirconium oxide powder to a pressing chamber; A moving module, connected to the powder spreader, and used to move the powder spreader into or out of the material pressing chamber; The control module is electrically connected to the feeding module, the moving module and the powder spreader.

9. The powder spreading system of the zirconia ceramic block dry pressing machine for all-ceramic dentures according to claim 8, characterized in that: The mobile module comprises: A lifting slide rail, wherein the extending direction of the lifting slide rail is the same as the depth direction of the pressing chamber; A lifting structure is slidably disposed on the lifting rail; A transverse sliding rail is arranged on the lifting structure; the extension direction of the transverse sliding rail is perpendicular to the depth direction of the pressing chamber; A transverse movement structure, slidably disposed on the transverse movement rail; Wherein, the powder spreader is arranged on the transverse movement structure.

10. The powder spreading system of the zirconia ceramic block dry pressing machine for all-ceramic dentures according to claim 9, characterized in that: The depth of the material pressing chamber is less than or equal to the sliding stroke of the lifting structure.

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