Granularity control device for ceramic core mineralizer

Abstract

The utility model discloses a granularity control device for a ceramic core mineralizer, which comprises a rack, one side of the rack is connected with a stirring drum through a fixing frame, a stirring device is arranged in the stirring drum and is in transmission connection with a motor, the stirring drum is provided with a cold water inlet and a cold water outlet, and the motor is arranged on the rack. The bottom of the mixing drum is communicated with a grading screening device, and a control panel for controlling the motor is mounted on the rack; according to the utility model, the stirring device in the stirring barrel is used for carrying out wet grinding on crushed zircon powder and zirconium balls, the zircon powder and the zirconium balls are discharged into the grading screening device after the grinding is completed, the zircon powder is subjected to grading screening and is discharged through the discharge hole in the side edge, so that the grinding control on the granularity of the zircon powder is realized; therefore, the mineralizer powder matched with the ceramic core matrix material in particle size is obtained, the crack phenomenon of the ceramic core after sintering is obviously improved, and meanwhile, the strength and the high-temperature creep resistance of the ceramic core are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of ceramic core manufacturing and production, in particular to a particle size control device for a ceramic core mineralizer. Background Art

[0002] As the performance of aircraft engines continues to improve, the turbine blades located in key positions are mostly hollow structures in order to withstand higher temperatures and more harsh operating environments; and ceramic cores are an indispensable link in forming complex cavities of hollow blades. The addition of an appropriate amount of mineralizer can reduce the sintering temperature and sintering time of the core, while maintaining or improving the comprehensive performance of the ceramic core. The added mineralizer interacts with the matrix material to activate the lattice and generate a solid solution; or the mineralizer is transformed into a liquid phase to bond the matrix material at the sintering temperature; or the matrix material is prevented from undergoing polycrystalline transformation, which is beneficial to sintering. Zircon powder is one of the commonly used mineralizers. Its advantage is that the melting point of zircon powder is as high as 2500°C, which inhibits the viscous flow of quartz glass under high temperature conditions. In addition, Zr 4 + It does not affect the devitrification process of quartz glass. In the early stage of sintering, a large number of cristobalite crystals can be formed on the core to resist the creep phase of quartz glass, which further improves the high temperature deformation resistance of the ceramic core.

[0003] After the existing mineralizer material is calcined at high temperature, some impurity elements in the mineralizer are removed, thereby affecting the sintering process of the ceramic core, so that it can fully react with the matrix material to form a stable solid solution; however, the calcined mineralizer is easy to agglomerate, and the particle size of the mineralizer processed by the traditional crushing and grinding method is uncontrollable, and it cannot be well matched with the matrix material, which also affects the mutual bonding with the matrix material at the sintering temperature of the ceramic core; ultimately resulting in defects such as cracks, low strength, and poor resistance to high-temperature deformation after the ceramic core is sintered. To this end, the present application proposes a particle size control device for a ceramic core mineralizer to solve the above problems. Utility Model Content

[0004] The main purpose of the utility model is to provide a particle size control device for a ceramic core mineralizer, which can effectively solve the problems in the background technology.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a particle size control device for a ceramic core mineralizer, comprising a frame, one side of the frame is connected to a mixing drum through a fixed frame, a mixing device is arranged in the mixing drum, the mixing device is transmission-connected to a motor, a cold water inlet and a cold water outlet are arranged on the mixing drum, the motor is installed on the frame, the bottom of the mixing drum is connected to a grading and screening device, and a control panel for controlling the motor is installed on the frame.

[0006] Preferably, the grading and screening device comprises an outer shell, the outer shell is connected to the bottom of the mixing drum, and multiple layers of sieve plates are arranged in the outer shell from top to bottom, and the sieve plates are detachably connected to the outer shell.

[0007] Preferably, a drain outlet is provided at the bottom of the shell.

[0008] Preferably, the mesh size of the multiple layers of sieve plates gradually increases from top to bottom.

[0009] Preferably, the sieve plate is arranged in two layers.

[0010] Preferably, the outer diameter of the outer shell is consistent with that of the mixing drum, and the outer shell and the mixing drum are detachably connected.

[0011] Preferably, a discharge port with a solenoid valve is provided at the bottom of the mixing drum.

[0012] Preferably, the stirring device comprises a main shaft, a plurality of stirring blades are fixedly connected to the main shaft, and the main shaft is transmission-connected to a motor.

[0013] Preferably, the stirring blades and the inner wall of the stirring drum are both coated with a polyurethane rubber layer.

[0014] Compared with the traditional technology, the beneficial effect produced by the utility model is that the stirring device in the stirring drum of the utility model wet-grinds the crushed zircon powder and zircon balls, and after the grinding is completed, the zircon powder and zircon balls are discharged into the grading and screening device, the zircon powder is graded and screened, and discharged through the discharge port on the side, so as to realize the grinding control of the zircon powder particle size, thereby obtaining the mineralizer powder matching the particle size of the ceramic core matrix material, significantly improving the crack phenomenon of the ceramic core after sintering, and at the same time improving the strength and high-temperature creep resistance of the ceramic core. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the utility model;

[0016] Figure 2 It is a top view of the overall structure of the utility model;

[0017] Figure 3 For the utility model Figure 2 Schematic diagram of the AA section.

[0018] In the figure: 1. frame; 2. fixed frame; 3. mixing drum; 31. discharge port; 4. stirring device; 41. main shaft; 42. stirring blade; 5. motor; 6. cold water inlet; 7. cold water outlet; 8. grading and screening device; 81. outer shell; 82. sieve plate; 83. drain outlet; 9. control panel. DETAILED DESCRIPTION

[0019] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0020] like Figure 1-3 As shown, in this embodiment, a particle size control device for a ceramic core mineralizer is proposed, including a frame 1, a mixing drum 3 is connected to one side of the frame 1 through a fixed frame 2, a mixing device 4 is arranged in the mixing drum 3, the mixing device 4 is connected to the motor 5 in a transmission manner, the mixing device 4 includes a main shaft 41, a plurality of mixing blades 42 are fixedly connected to the main shaft 41, the main shaft 41 is connected to the motor 5 in a transmission manner, the mixing blades 42 and the inner wall of the mixing drum 3 are coated with a polyurethane rubber layer, a cold water inlet 6 and a cold water outlet 7 are arranged on the mixing drum 3 to realize the circulation of cooling water, the motor 5 is installed on the frame 1, the motor 5 is a continuously variable speed motor, the bottom of the mixing drum 3 is connected to a grading screening device 8, a control panel 9 for controlling the motor 5 is installed on the frame 1, and the opening and speed of the motor 5 are controlled by the control panel 9.

[0021] The grading and screening device 8 includes an outer shell 81, which is connected to the bottom of the mixing drum 3. Multiple layers of sieve plates 82 are arranged in the outer shell 81 from top to bottom. Specifically, the sieve plates 82 are arranged in two layers, and the mesh size of the sieve plates 82 gradually increases from top to bottom. The sieve plates 82 are detachably connected to the outer shell 81, which is convenient for taking materials. A drain port 83 is arranged at the bottom of the outer shell 81. The outer diameter of the outer shell 81 is consistent with that of the mixing drum 3 and the outer shell 81 is detachably connected to the mixing drum 3. A discharge port 31 with a solenoid valve is arranged at the bottom of the mixing drum 3. The solenoid valve is electrically connected to the control panel 9. The mixing drum 3 is detachably connected to the outer shell 81, which is convenient for removing the grading and screening device 8 and cleaning the grading and screening device 8.

[0022] When in use, the ceramic core is first calcined at 1540℃-1580℃ with zircon powder as mineralizer, kept at temperature for 4-7h, and then mechanically broken into small pieces. The size of a single small piece after breaking shall not be larger than 20cm. 3 ;

[0023] Zirconium balls with a diameter of 8-12 mm, zirconium balls with a diameter of 3-6 mm, and zircon powder after calcination and crushing are added into the mixing drum 3, and then cooling water is added to submerge the mixture, and the motor 5 is turned on, and the mixture is stirred and ball-milled by the stirring device, and the stirring time is set through the control panel 9, and the stirring ball milling can be automatically stopped to control the ball milling time, thereby controlling the particle size of the powder. The added cooling water can prevent the mixing drum 3 from overheating during the stirring ball milling process. After the stirring is completed, the solenoid valve is opened to discharge the mixture into the grading and screening device 8. The mesh number of the sieve plate 82 can be freely adjusted. The two layers of sieve plates 82 screen the mixture. In the next ball milling, the motor 5 vibrates and the ball The mill vibrates and vibrates and screens the mixture. Before the second discharge of the mixing drum 3, the drain port 83 at the bottom of the shell 81 is opened to drain the accumulated water in the shell 81, and then the powder on the lower sieve plate 82 is taken out, which is the required powder. The mixture on the upper sieve plate 82 returns to the mixing drum 3 to continue ball milling. After the powder is taken out, it is put back on the lower sieve plate 82 again, and then the solenoid valve is opened again to discharge the material. The reciprocating operation is performed, and the taken out powder is shoveled into the enamel tray and immediately sent to the oven for baking. The baking temperature is 150℃ and the time is ≥12h. The main purpose is to bake out the moisture in the mineralizer powder. After the baking is completed, the power is turned off and the furnace is cooled to room temperature. Then the powder is stirred evenly and placed in a sealed container for storage for later use.

[0024] The zircon powder of the mineralizer powder has been calcined at high temperature. The calcination temperature and time are controllable, which can effectively reduce the impurity element Fe mixed in it. 2 O 3 The mineralizer zircon powder is crushed and ball-milled again after calcination. The ball-milling medium, time, temperature, mesh size, etc. are all controllable. In this way, the mineralizer powder that matches the particle size of the ceramic core matrix material can be obtained. This significantly improves the crack phenomenon of the ceramic core after sintering, and also improves the strength and high temperature creep resistance of the ceramic core.

[0025] The above only describes some exemplary embodiments of the present invention by way of illustration. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above description is illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A particle size control device for a ceramic core mineralizer, comprising a frame, characterized in that: A mixing drum is connected to one side of the frame through a fixed frame, a mixing device is arranged in the mixing drum, the mixing device is transmission-connected to the motor, a cold water inlet and a cold water outlet are arranged on the mixing drum, the motor is mounted on the frame, a grading and screening device is connected to the bottom of the mixing drum, and a control panel for controlling the motor is mounted on the frame.

2. The particle size control device of a ceramic core mineralizer according to claim 1, characterized in that: The grading and screening device comprises an outer shell, which is connected to the bottom of the mixing drum. Multiple layers of sieve plates are arranged in the outer shell from top to bottom, and the sieve plates are detachably connected to the outer shell.

3. The particle size control device of a ceramic core mineralizer according to claim 2, characterized in that: The bottom of the shell is provided with a drain port.

4. The particle size control device of a ceramic core mineralizer according to claim 2, characterized in that: The mesh numbers of the multi-layer sieve plates gradually increase from top to bottom.

5. The particle size control device of a ceramic core mineralizer according to claim 4, characterized in that: The sieve plate is arranged in two layers.

6. The particle size control device of a ceramic core mineralizer according to claim 2, characterized in that: The outer diameter of the shell is consistent with that of the mixing drum, and the shell and the mixing drum are detachably connected.

7. The particle size control device of a ceramic core mineralizer according to claim 6, characterized in that: A discharge port with a solenoid valve is arranged at the bottom of the mixing drum.

8. The particle size control device of a ceramic core mineralizer according to claim 1, characterized in that: The stirring device comprises a main shaft, a plurality of stirring blades are fixedly connected to the main shaft, and the main shaft is drivingly connected to a motor.

9. The particle size control device of a ceramic core mineralizer according to claim 8, characterized in that: The stirring blades and the inner wall of the stirring barrel are both covered with a polyurethane rubber layer.

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