Powder scraping assembly for zirconium oxide porcelain block preparation

Abstract

The invention discloses a powder scraping assembly for zirconia ceramic block preparation. The powder scraping assembly comprises a fixed seat, a rotary driving part, a lifting driving part and a scraper. The rotary driving part is arranged on the fixed seat and comprises a driving piece and a connecting shaft; the driving end of the lifting driving part is connected to the fixing base and used for driving the fixing base to ascend and descend in the vertical direction. The scraper is detachably connected to the tool apron, the tool apron is rotationally connected to the connecting shaft, the scraper comprises a scraper section, a first powder guide section and a second powder guide section, the first powder guide section and the second powder guide section are connected to the two ends of the slicking section respectively and are arranged in a central symmetry mode, and the included angle between the first powder guide section and the slicking section is an obtuse angle; a gap is formed between the tool apron and the rotary driving part, and a self-adaptive regulation and control mechanism is arranged in the gap and used for regulating and controlling the scraper in real time and keeping the scraper horizontal. And the gap can allow the scraper to incline within a certain angle, so that powder accumulation or local cavities caused by the fact that the scraper conducts scraping under large downward pressure are avoided, and the powder filling effect is improved.

Description

Technical Field

[0001] The present invention relates to the field of zirconia ceramic block preparation, and particularly to a powder scraping assembly for zirconia ceramic block preparation. Background Art

[0002] Zirconia ceramic blocks have the characteristics of high hardness, strong wear resistance and good aesthetics. With their excellent physical and chemical properties, stable biocompatibility and good aesthetic restoration effect, zirconia ceramic blocks have become an important material for manufacturing dentures and dental restorations. In the production process of zirconia ceramic blocks, dry pressing, injection molding, isostatic pressing, etc. are often used in the forming stage. Dry pressing is a commonly used forming method. It is necessary to lay the zirconia powder flat in the mold for dry pressing. The uniformity of powder filling is the core process link determining the performance of the final product.

[0003] Currently, in the dry pressing process, after the powder is filled in the mold, the powder leveling process mostly uses a straight plate type scraper or a flexible blade. The scraper is driven to move horizontally manually or mechanically to scrape the powder protruding from the mold and scrape off the excess powder to initially compact the powder.

[0004] However, in the traditional powder leveling process, the method of scraping by driving the scraper or flexible blade to move horizontally manually or mechanically, due to the inability to accurately control the moving speed and downward pressure of the scraper or flexible blade, is prone to powder splashing or uneven leveling pressure due to the fluctuation of the moving speed. Moreover, when the powder accumulates and protrudes from the die hole, the horizontal scraping method is difficult to evenly disperse the powder, resulting in powder accumulation or local voids, and the filling effect is not good. Summary of the Invention

[0005] The purpose of the present invention is to provide a powder scraping assembly for zirconia ceramic block preparation to solve the problems of powder accumulation or local voids existing in the traditional powder leveling process.

[0006] To achieve this purpose, the present invention adopts the following technical solutions: A powder scraping assembly for zirconia ceramic block preparation, comprising: A fixed seat; A rotary drive part, arranged on the fixed seat, the rotary drive part includes a driving member and a connecting shaft; A lifting drive part, the driving end of the lifting drive part is connected to the fixed seat, and is used to drive the fixed seat to lift in the vertical direction; A scraper, the scraper is detachably connected to a tool holder, the tool holder is rotatably connected to the connecting shaft, the scraper includes a leveling section and a first powder guiding section and a second powder guiding section respectively connected to both ends of the leveling section. The first powder guiding section and the second powder guiding section are centrosymmetrically arranged, and the included angle between the first powder guiding section and the leveling section is an obtuse angle; There is a gap between the tool holder and the rotary drive part, and an adaptive regulation mechanism is arranged in the gap. The adaptive regulation mechanism is used to regulate the scraper in real time and keep it horizontal.

[0007] Optionally, the length of the scraping section is equal to the diameter of the die hole, and the inner sides of the connections between the scraping section and the first powder guiding section and the second powder guiding section are aligned with the edges of the die hole.

[0008] Optionally, a slot is formed in the connecting shaft, and the adaptive regulation mechanism includes: A plug rod, which is rotatably connected to the tool holder and is inserted into the slot. A magnetic block is arranged at the end of the plug rod, and an electromagnet is arranged at the bottom of the slot; A slider, which is slidably arranged in the slot. A clamping groove is arranged on the plug rod, and the slider is located in the clamping groove; A sliding rheostat, the sliding piece of which is connected to the slider, and the electromagnet coil is connected in series with the sliding rheostat; Wherein, when the slider drives the sliding piece to move towards the bottom of the slot, the resistance value of the sliding rheostat gradually decreases.

[0009] Optionally, a spring is arranged in the slot, and two ends of the spring are respectively abutted against the bottom of the slot and the slider.

[0010] Optionally, the gap allows the tool holder to have a free yaw of ±5°.

[0011] Optionally, the driving part is a servo motor, and the lifting drive part is a slide table cylinder.

[0012] Optionally, an automatic pressure regulating valve is connected to the slide table cylinder, and pressure sensors are arranged on the lower end faces of the connecting shaft, the first powder guiding section and the second powder guiding section. When the detected value of the pressure sensor reaches the set value, the automatic pressure regulating valve opens.

[0013] Optionally, an oil pressure buffer is arranged on the slide table cylinder.

[0014] Optionally, powder blowing mechanisms are arranged at the positions of the tool holder corresponding to the first powder guiding section and the second powder guiding section. The powder blowing mechanisms include: A mounting seat, which is fixed on the tool holder; A blowing head, which is rotatably connected to the lower end face of the mounting seat; Air guiding plates, which are fixed on the tool holder. Two air guiding plates are symmetrically arranged along the mounting seat, and the bottoms of the two air guiding plates are bent towards the blowing head.

[0015] Compared with the prior art, the present invention has the following beneficial effects: In a powder scraping assembly for preparing a zirconia ceramic block provided by the present invention, a lifting driving part drives a fixed seat, a rotating driving part and a scraper connected to the fixed seat to move towards a mold, so that the scraper can be attached to the upper end surface of the mold and apply an appropriate positive pressure to the mold; thereafter, a driving member is started to drive the scraper to rotate, and the scraping section levels the powder in the die hole, while the first powder guiding section and the second powder guiding section can gradually push the powder outside the die hole into the die hole during the rotation process; meanwhile, if the powder in the die hole protrudes from the upper surface of the mold, the scraper tilts when it contacts the upper surface of the mold, and the adaptive control mechanism can drive the scraper to gradually tend to be horizontal during the rotation process and finally be completely attached to the upper surface of the grinding tool. The rotating driving part and the lifting driving part can accurately control the rotation speed and the downward pressure of the scraper, so that the scraper maintains a uniform downward pressure during the leveling process, which is beneficial to improving the filling effect of the powder.

[0016] When the powder in the die hole protrudes from the upper surface of the mold, the scraper can tilt within a certain angle, so that the scraper can uniformly apply a downward pressure to the protruding powder, effectively avoiding the situation that the lower layer of powder is compacted due to the scraper pressing the powder excessively and resulting in local voids; the adaptive control mechanism can continuously adjust the tool holder, so that the scraper gradually tends to be horizontal during the rotation process, that is, the scraper gradually presses down while rotating, so as to evenly spread the protruding powder in the die hole, further avoiding the situation of powder accumulation or local voids; at the same time, the more the powder protruding from the die hole, the greater the inclination angle of the tool holder, and then, the greater the driving force applied by the adaptive control mechanism to make the tool holder tend to be horizontal. Therefore, the more the accumulated powder, the more powder the scraper pushes when starting to rotate, so that the accumulated powder can be more quickly and evenly dispersed around, which can further improve the filling effect of the powder. Description of the Drawings

[0017] 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 following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] The structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those who are familiar with this technology to understand and read, and are not used to limit the limited conditions under which the present invention can be implemented. Therefore, they do not have a substantial technical meaning. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope that can be covered by the technical content disclosed by the present invention.

[0019] Figure 1It is a schematic structural diagram of a powder scraping assembly for preparing zirconia ceramic blocks.

[0020] Figure 2 It is a schematic structural diagram of a powder scraping assembly for preparing zirconia ceramic blocks.

[0021] Figure 3 It is a schematic structural diagram of a scraper in a powder scraping assembly for preparing zirconia ceramic blocks.

[0022] Figure 4 It is a schematic structural diagram of a scraper in a powder scraping assembly for preparing zirconia ceramic blocks.

[0023] Figure 5 It is Figure 4 a partial enlarged view of part A in

[0024] Illustration: 1. Fixed seat; 2. Rotating drive part; 21. Driving part; 22. Connecting shaft; 23. Gap; 3. Lifting drive part; 31. Automatic pressure regulating valve; 32. Oil pressure buffer; 4. Scraper; 41. Knife seat; 42. Scraping flat section; 43. First powder guiding section; 44. Second powder guiding section; 5. Adaptive control mechanism; 51. Slot; 52. Electromagnet; 53. Plug rod; 54. Magnet; 55. Slide block; 56. Slide rheostat; 57. Card slot; 58. Slide groove; 59. Spring; 6. Blowing mechanism; 61. Mounting seat; 62. Blowing head; 63. Air guiding plate. Detailed implementation manners

[0025] To make the objectives, features, and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the embodiments described below are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0026] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present invention. It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be intermediate components present at the same time.

[0027] In the production process of zirconia ceramic blocks, when filling zirconia powder into the die holes of the mold during the forming stage, in the prior art, a manual or simple mechanical drive method is usually adopted to drive a scraper or a flexible blade to move horizontally to achieve the purpose of leveling; however, when implementing the above leveling method, the moving speed and downward pressure of the scraper or the flexible blade cannot be accurately controlled, and it is easy to cause powder splashing or uneven flattening pressure due to the fluctuation of the moving speed, resulting in the situation of powder or local voids.

[0028] Based on this, an embodiment of the present invention provides a powder scraping assembly for preparing zirconia ceramic blocks, including a fixed seat, a rotary drive part, a lifting drive part and a scraper. The rotary drive part is arranged on the fixed seat and includes a driving part and a connecting shaft; the driving end of the lifting drive part is connected to the fixed seat and is used to drive the fixed seat to lift in the vertical direction; the scraper is detachably connected to the tool holder, the tool holder is rotatably connected to the connecting shaft, the scraper includes a scraping section and a first powder guiding section and a second powder guiding section respectively connected to both ends of the scraping section, the first powder guiding section and the second powder guiding section are centrosymmetrically arranged, and the included angle between the first powder guiding section and the scraping section is an obtuse angle; there is a gap between the tool holder and the rotary drive part, and an adaptive regulation mechanism is arranged in the gap. The adaptive regulation mechanism is used to continuously regulate the tool holder to tend to be horizontal when the tool holder is tilted, and the greater the tilt angle of the tool holder, the greater the driving force of the adaptive regulation mechanism to regulate the tool holder to tend to be horizontal.

[0029] In the powder scraping assembly for preparing zirconia ceramic blocks provided by the present invention, the lifting drive part drives the fixed seat and the rotary drive part and the scraper connected to the fixed seat to move towards the mold, so that the scraper can be attached to the upper surface of the mold and apply an appropriate positive pressure to the mold; then, the driving part is started to drive the scraper to rotate, and the scraping section levels the powder in the die hole, and the first powder guiding section and the second powder guiding section can gradually push the powder outside the die hole into the die hole during the rotation process; at the same time, if the powder in the die hole protrudes from the upper surface of the mold, the scraper will tilt when it contacts the upper surface of the mold, and the adaptive regulation mechanism can drive the scraper to gradually tend to be horizontal during the rotation process and finally be completely attached to the upper surface of the grinding tool. The rotary drive part and the lifting drive part can accurately control the rotation speed and downward pressure of the scraper, and keep the downward pressure of the scraper uniform during the leveling process, which is beneficial to improving the filling effect of the powder.

[0030] The powder inside the die hole protrudes above the upper surface of the die. The scraper can tilt within a certain angle, enabling the scraper to uniformly apply a downward pressure to the protruding powder, effectively avoiding the situation where the lower-layer powder is compacted due to excessive downward pressure of the scraper, resulting in local cavities. The adaptive control mechanism can continuously adjust the tool holder, making the scraper gradually tend to be horizontal during rotation. That is, the scraper gradually presses down while rotating, so as to evenly flatten the protruding powder in the die hole, further avoiding the situation of powder accumulation or local cavities. At the same time, the more powder protrudes from the die hole, the greater the inclination angle of the tool holder. Subsequently, the greater the driving force applied by the adaptive control mechanism to make the tool holder tend to be horizontal. Therefore, the more powder accumulates, the more powder the scraper pushes at the beginning of rotation, enabling the accumulated powder to be more quickly and evenly dispersed around, which can further improve the filling effect of the powder.

[0031] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings and through specific embodiments.

[0032] The embodiment of the present invention provides a powder scraping assembly for preparing zirconia ceramic blocks, which is applicable to the scenario of scraping the powder in the die hole after filling the zirconia powder into the die hole of the mold during the molding stage of the zirconia ceramic block preparation process by dry pressing or isostatic pressing. It has the advantages of evenly flattening the powder in the die hole and improving the filling effect.

[0033] As Figure 1 、 Figure 2 and Figure 3 shown, the powder scraping assembly includes a fixed seat 1, a rotary drive part 2, a lifting drive part 3 and a scraper 4 arranged on the fixed seat 1. Specifically, the rotary drive part 2 includes a driving member 21 and a connecting shaft 22. A tool holder 41 is rotatably connected to the connecting shaft 22, and the scraper 4 is detachably connected to the tool holder 41. The driving member 21 is used to drive the tool holder 41 and the scraper 4 to rotate through the connecting shaft 22. According to different mold specifications, scrapers 4 of different sizes can be replaced. The lifting drive part 3 has a driving end and a fixed end. The driving end is used to drive the fixed seat 1 to lift in the vertical direction, thereby driving the scraper 4 to lift, so that the scraper 4 can fit with the upper surface of the mold. The fixed end can be fixedly connected with a mounting plate, and the mounting plate can be installed on the molding equipment. When powder flattening is required, the powder scraping assembly can be moved to directly above the die hole through the mounting plate.

[0034] Furthermore, the scraper 4 includes a scraping section 42 and a first powder guiding section 43 and a second powder guiding section 44 respectively connected to both ends of the scraping section. The first powder guiding section 43 and the second powder guiding section 44 are centrosymmetrically arranged, and the included angle between the first powder guiding section 43 and the scraping section 42 is an obtuse angle.

[0035] Further, the length of the leveling section 42 is equal to the diameter of the die hole, and the inner sides of the joints of the leveling section 42 with the first powder guiding section 43 and the second powder guiding section 44 are aligned with the edges of the die hole.

[0036] Specifically, the scraper 4 fits on the upper surface of the die, and the rotation driving part 2 drives the scraper 4 to rotate. The leveling section 42 disperses and levels the accumulated powder in the die hole, and the powder left outside the die hole is pushed by the first powder guiding section 43 and the second powder guiding section 44. Moreover, during rotation, the first powder guiding section 43 and the second powder guiding section 44 can gradually push the powder outside the die hole into the die hole, facilitating the uniform filling of the powder in the die hole. The inner corners of the joints of the leveling section 42 with the first powder guiding section 43 and the second powder guiding section 44 are aligned with the edges of the die hole, facilitating the full filling of the die hole by the leveling section 42 and improving the filling effect.

[0037] As Figure 3 、 Figure 4 and Figure 5 shown, meanwhile, there is a gap 23 between the tool holder 41 and the rotation driving part 2, and an adaptive regulation mechanism 5 is arranged in the gap 23. The adaptive regulation mechanism 5 is used to continuously regulate the tool holder 41 to tend to be horizontal when the tool holder 41 is tilted, and the greater the tilt angle of the tool holder 41, the greater the driving force of the adaptive regulation mechanism 5 to regulate the tool holder 41 to tend to be horizontal; at the same time, the height of the gap 23 allows the tool holder 41 to have a free swing of ±5°.

[0038] Specifically, when adding powder to the die hole, the powder is prone to accumulate and protrude above the upper surface of the die at the center of the die hole, and depending on the adding method, the accumulated powder in the die hole may tilt in any direction; therefore, when the lifting driving part 3 drives the scraper 4 to descend, the scraper 4 will tilt when it touches the protruding powder. Thus, the pressure exerted by the scraper 4 on the powder will be evenly dispersed, and the powder with a higher accumulation will not be overly squeezed downward, resulting in the powder below being compacted and finally having voids during leveling; after the scraper 4 descends to a proper position, the rotation driving part 2 drives the scraper 4 to rotate. Under the downward driving force exerted by the adaptive regulation mechanism 5 on the tool holder 41, the scraper 4 gradually tends to be horizontal while rotating and finally fits on the upper surface of the die. Thus, during the rotation and downward pressing of the scraper 4, the protruding powder can be evenly spread flat around the die hole, avoiding local voids caused by powder accumulation; at the same time, the more powder protrudes from the die hole, the greater the tilt angle of the tool holder 41, and consequently, the greater the driving force exerted by the adaptive regulation mechanism 5 to make the tool holder 41 tend to be horizontal. Therefore, the more powder accumulates, the more powder the scraper pushes at the beginning of rotation, enabling the accumulated powder to be more quickly dispersed around and fill the internal voids of the die hole, which is conducive to the powder being more efficiently and evenly filled in the die hole and can further improve the filling effect of the powder.

[0039] As Figure 4 、Figure 5 As shown, in the embodiment of the present invention, a slot 51 is provided on the connecting shaft 22. The adaptive control mechanism 5 includes a plug rod 53, a slider 55, and a sliding rheostat 56. The plug rod 53 is rotatably connected to the tool holder 41, and the plug rod 53 is inserted into the slot 51. A magnetic block 54 is provided at the end of the plug rod 53, and an electromagnet 52 is provided at the bottom of the slot 51; the slider 55 is slidably disposed in the slot 51, and a chute 58 for the slider 55 to slide is provided on the side wall of the slot 51. A clamping groove 57 is provided on the plug rod 53, and the slider 55 is located in the clamping groove 57; the sliding piece of the sliding rheostat 56 is connected to the slider 55, and the coil of the electromagnet 52 is connected in series with the sliding rheostat 56; wherein, when the slider 55 moves the sliding piece towards the bottom of the slot 51, the resistance value of the sliding rheostat 56 gradually decreases. Accordingly, the current in the electromagnetic coil of the electromagnet 52 increases, the magnetic force of the electromagnet 52 also gradually increases, the repulsive force between the electromagnet 52 and the magnetic block 54 increases, and the driving force applied to the tool holder 41 is also greater.

[0040] It should be noted that the rotational connection between the tool holder 41 and the connecting shaft 22 is located in the middle of the tool holder 41. A groove is provided at the lower part of the connecting shaft 22, and the tool holder 41 is located in the groove. The gap formed between the upper end surface of the tool holder 41 and the bottom of the groove is the gap 23. Adaptive control mechanisms 5 are provided on both sides in the gap 23, and the two groups of adaptive control mechanisms 5 are symmetrically arranged, so that when the scraper 4 tilts in any direction to the two sides, it can be adjusted in real time by the adaptive control mechanism 5 towards a horizontal direction.

[0041] Specifically, the plug rod 53 is rotatably connected to the upper end surface of the tool holder 41, and the end of the plug rod 53 is located in the slot 51. When the tool holder 41 tilts, the plug rod 53 rotates and its end penetrates deeper into the slot 51. The plug rod 53 can limit the tool holder 41 from shifting in other directions; the electromagnet 52 provided at the bottom of the slot 51 repels the electromagnet 52 at the end of the plug rod 53, so that when the plug rod 53 penetrates deeper into the slot 51, the plug rod 53 always has a tendency to reset. Subsequently, the tool holder 41 and the scraper 4 always have a tendency to be horizontal; when the plug rod 53 penetrates deeper into the slot 51, the plug rod 53 drives the slider 55 to slide towards the bottom of the slot 51. When the slider 55 slides, it drives the sliding piece of the sliding rheostat 56 to move, so that the resistance value of the sliding rheostat 56 gradually decreases. The sliding rheostat 56 is connected in series with the coil of the electromagnet 52. When the resistance value of the sliding rheostat 56 decreases, the current in the coil of the electromagnet 52 increases. Accordingly, the magnetic force of the electromagnet 52 becomes larger, the repulsive force between the electromagnet 52 and the magnetic block 54 increases, and the driving force applied to the tool holder 41 is also greater. The pressing amplitude of the scraper 4 is greater, so that more powder is pushed when the scraper 4 rotates. Therefore, the larger the inclination angle of the scraper 4, the greater the force driving the scraper 4 to reset. When the scraper 4 rotates in an inclined state, it can push more powder to disperse around, which is beneficial to evenly spreading the powder.

[0042] It can be understood that during the continuous rotation of the scraping blade 4, the accumulated powder gradually decreases, and the inclination angle of the scraping blade 4 also gradually decreases. When the scraping blade 4 tends to be horizontal, the pressure exerted on the scraping blade 4 by the adaptive control mechanism 5 gradually decreases, so that the scraping blade 4 will not push too much powder to rotate. On the one hand, it can avoid the reverse extrusion of the scraping blade 4 by the powder, and on the other hand, it can avoid the re-accumulation of too much powder during the pushing process, which is beneficial to the further even spreading of the powder.

[0043] Under the combined action of two groups of symmetrically arranged adaptive control mechanisms 5, the scraping blade 4 is kept horizontal in the initial state.

[0044] It should be noted that the card slot 57 communicates with the upper end surface of the plug rod 53. When the plug rod 53 penetrates into the inner part of the slot 51, the slider 55 is stuck in the card slot 57, and when the plug rod 53 moves away from the bottom of the slot 51, the slider 55 can be disengaged from the card slot 57.

[0045] It can be understood that since the powder is generally composed of a variety of materials, when the density of the powder changes, the overall magnetic force of the electromagnet 52, that is, the initial magnetic force of the electromagnet 52, can be changed by changing the magnitude of the current, so that the downward pressure of the scraping blade 4 on the powder is always kept within a suitable range.

[0046] Furthermore, a spring 59 is arranged in the slot 51, and both ends of the spring 59 are respectively abutted against the bottom of the slot 51 and the slider 55. For example, a ring piece can be arranged on the upper end surface of the plug rod 53, and the ring piece is connected to the spring 59; when the scraping blade 4 is in a horizontal state and the slider 55 just enters the card slot 57, the ring piece abuts against the upper end surface of the plug rod 53. At this time, the spring 59 is in an initial state; when the plug rod 53 penetrates into the inner part of the slot 51, the spring 59 is compressed, and when the plug rod 53 resets, the spring 59 resets, and then the slider 55 can be pushed to reset. When the scraping blade 4 is in a horizontal state, the repulsive forces between the magnetic blocks 54 on both sides and the electromagnet 52 of the two sides of the adaptive control mechanism 5 are kept the same, so that the scraping blade 4 is kept horizontal.

[0047] Exemplarily, the driving member 21 can be a servo motor, and the connecting shaft 22 is driven by the servo motor to rotate, which is convenient for precisely controlling the rotation speed of the scraping blade 4; the lifting driving part 3 can be a slide table cylinder, which can precisely control the downward pressure of the scraping blade 4. It can effectively avoid the situation of powder accumulation or local voids caused by the fluctuation of the rotation speed of the scraping blade 4 or uneven pressure, which is beneficial to improving the filling effect.

[0048] Further, an automatic pressure regulating valve 31 is connected to the sliding table cylinder. Pressure sensors are provided on the lower end surfaces of the connecting shaft 22, the first powder guiding section 43, and the second powder guiding section 44. When the detected value of the pressure sensor reaches the set value, the automatic pressure regulating valve 31 opens. For example, a pressure sensor is provided at the position on the connecting shaft 22 where it contacts the tool holder 41 after tilting. When there is a large accumulation of powder in the die hole, causing the scraper 4 to be squeezed upward and the tilting angle to be greater than 5°, the tool holder 41 squeezes the connecting shaft 22 and the pressure sensor. When the detected value of the pressure sensor is higher than the set value, indicating that the downward pressure of the scraper 4 is large, at this time, the automatic pressure regulating valve 31 can automatically start to relieve pressure, causing the sliding end of the sliding table cylinder to rise, thereby reducing the downward pressure of the scraper 4.

[0049] Meanwhile, an oil pressure buffer 32 is also provided on the sliding table cylinder. The oil pressure buffer 32 can enable the sliding table cylinder to drive the scraper 4 to descend, and make the scraper 4 decelerate smoothly and stop before contacting the upper surface of the mold, avoiding local compression of the powder caused by rigid impact when the scraper 4 stops, and on the other hand, it can also protect the scraper 4.

[0050] In an embodiment of the present invention, a powder blowing mechanism is provided at the position on the tool holder 41 corresponding to the connection of the first powder guiding section 43 and the second powder guiding section 44. The powder blowing mechanism includes a mounting seat 61, a blowing head 62, and a wind guiding plate 63. The mounting seat 61 is fixed to the tool holder 41; the blowing head 62 is rotatably connected to the lower end surface of the mounting seat 61; the wind guiding plate 63 is fixed to the tool holder 41, and two wind guiding plates 63 are symmetrically arranged along the mounting seat 61, and the bottoms of the two wind guiding plates 63 are bent toward the blowing head 62.

[0051] Specifically, two groups of powder blowing mechanisms are symmetrically arranged on both sides of the tool holder 41, and the powder blowing mechanism is located inside the included angle between the first powder guiding section 43 or the second powder guiding section 44 and the leveling section 42. A micro fan and a driving motor can be arranged inside the mounting seat 61. The air outlet of the micro fan can be communicated with the blowing head 62, and the output shaft of the driving motor is connected to the rotating shaft of the blowing head 62. When the blowing head 62 blows air toward the wind guiding plates 63 on both sides, the wind guiding plates 63 can change the wind direction, so as to blow the powder accumulated inside the first powder guiding section 43 or the second powder guiding section 44 in the corresponding direction. For example, when the powder in the die hole is filled, there is still remaining powder inside the first powder guiding section 43 and the second powder guiding section 44. The driving motor is used to drive the blowing head 62 to rotate and face the inner wind guiding plate 63, and the bottom of the inner wind guiding plate 63 is bent outward, so as to blow the remaining powder outside the scraper 4. Correspondingly, when the powder in the die hole is insufficient, the blowing head 62 can be made to blow air toward the outer wind guiding plate 63 to accelerate the filling of the powder into the die hole.

[0052] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A powder scraping component for preparing zirconia ceramic blocks, characterized in that, Comprising: Fixed seat (1); Rotary drive unit (2), provided on the fixed seat (1), the rotary drive unit (2) includes a drive member (21) and a connecting shaft (22); Lifting drive unit (3), the drive end of the lifting drive unit (3) is connected to the fixed seat (1), and is used to drive the fixed seat (1) to lift in the vertical direction; Scraper (4), the scraper (4) is detachably connected to the tool holder (41), the tool holder (41) is rotatably connected to the connecting shaft (22), the scraper (4) includes a leveling section (42) and a first powder guiding section (43) and a second powder guiding section (44) respectively connected to both ends of the leveling section (42), the first powder guiding section (43) and the second powder guiding section (44) are arranged centrosymmetrically, and the included angle between the first powder guiding section (43) and the leveling section (42) is an obtuse angle; There is a gap (23) between the tool holder (41) and the rotary drive unit (2), and an adaptive control mechanism (5) is arranged in the gap (23); The adaptive control mechanism (5) is used to continuously adjust the tool holder (41) to tend to be horizontal when the tool holder (41) is tilted, and the greater the tilt angle of the tool holder (41), the greater the driving force for the adaptive control mechanism to adjust the tool holder (41) to tend to be horizontal.

2. The powder scraping assembly for preparing zirconia ceramic blocks according to claim 1, wherein The length of the leveling section (42) is equal to the diameter of the die hole of the mold, and the inner sides of the joints of the leveling section (42) with the first powder guiding section (43) and the second powder guiding section (44) are aligned with the edges of the die hole of the mold.

3. The powder scraping assembly for preparing zirconia ceramic blocks according to claim 1, characterized in that, A slot (51) is formed on the connecting shaft (22), and the adaptive control mechanism (5) includes: A plug rod (53), rotatably connected to the tool holder (41), and the plug rod (53) is inserted into the slot (51), a magnetic block (54) is provided at the end of the plug rod (53), and an electromagnet (52) is arranged at the bottom of the slot (51); A slider (55), slidably arranged in the slot (51), a clamping groove (57) is arranged on the plug rod (53), and the slider (55) is located in the clamping groove (57); A sliding rheostat (56), the sliding piece of the sliding rheostat (56) is connected to the slider (55), and the coil of the electromagnet (52) is connected in series with the sliding rheostat (56); Wherein, when the slider (55) drives the sliding piece to move towards the bottom of the slot (51), the resistance value of the sliding rheostat (56) gradually decreases.

4. The powder scraping assembly for preparing zirconia ceramic blocks according to claim 3, characterized in that, A spring (59) is arranged in the slot (51), and both ends of the spring (59) are respectively abutted against the bottom of the slot (51) and the slider (55).

5. The scraping powder assembly for preparing zirconia ceramic blocks according to claim 1, characterized in that, The gap (23) allows the tool holder (41) to have a free yaw of ±5°.

6. The scraping powder assembly for preparing a zirconia ceramic block according to claim 4, characterized in that The drive member (21) is a servo motor, and the lifting drive unit (3) is a slide cylinder.

7. The powder scraping assembly for preparing zirconia ceramic blocks according to claim 1, characterized in that, An automatic pressure regulating valve (31) is connected to the slide cylinder, pressure sensors are arranged on the connecting shaft (22), the first powder guiding section (43) and the second powder guiding section (44), and when the detection value of the pressure sensor reaches the set value, the automatic pressure regulating valve (31) opens.

8. The powder scraping assembly for preparing zirconia ceramic blocks according to claim 1, wherein, An oil buffer (32) is provided on the sliding table cylinder.

9. The scraping powder assembly for preparing zirconia ceramic blocks according to claim 1, characterized in that, Blowing powder mechanisms are provided at positions corresponding to the first powder guiding section (43) and the second powder guiding section (44) on the tool holder (41). The blowing powder mechanism includes: A mounting seat (61), fixed on the tool holder (41); A blowing head (62), rotatably connected to the lower end surface of the mounting seat (61); Air guide plates (63), fixed on the tool holder (41). Two air guide plates (63) are symmetrically arranged along the mounting seat (61), and the bottoms of the two air guide plates (63) are bent towards the blowing head (62).

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