Ceramic powder pretreatment device

Abstract

The utility model discloses a ceramic powder pretreatment device which comprises an inclined roller, the axis of the roller is inclined relative to the horizontal direction, and the opening end of the roller faces upwards; the inner roller wall of the roller is arc-shaped in the axial direction to form a cavity with the middle diameter larger than the diameters of the two ends; the driving device drives the roller to rotate; at least one L-shaped plate is arranged in the roller as a stirring piece, two free ends of the L-shaped plate are fixedly connected to the inner roller wall and the roller bottom wall of the roller respectively, and notches are formed in the connecting positions of the L-shaped plate and the inner roller wall and the roller bottom wall. According to the device, the ceramic powder can be fully mixed, the uniformity is improved, the morphology is improved, the water content and the adhesion are adjusted, the loss is reduced, and the yield is improved, so that the quality and the production efficiency of ceramic products are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to ceramic powder processing technical field more specifically, relate to a kind of ceramic powder pretreatment device. BACKGROUND

[0002] In the production process of RPD (reactive plasma deposition) film-coated ceramic products, the pretreatment of ceramic powder is crucial. The purpose of pretreatment is to make the powder achieve uniform particle size, moisture content and cohesiveness, in order to improve the efficiency and product quality of subsequent forming process. Traditional drum-type pretreatment devices usually adopt straight cylinder design, lack effective stirring structure, which leads to easy accumulation of powder at the bottom, poor mixing uniformity, low efficiency and poor uniformity.

[0003] Therefore, how to provide a more efficient and uniform pretreatment device has become a technical problem urgently to be solved in the field. SUMMARY

[0004] The utility model aims at providing a kind of ceramic powder pretreatment device, can efficiently, uniformly pretreats ceramic powder, improves the uniformity of powder, improves the morphology of powder, adjusts the moisture content and cohesiveness of powder, reduces the loss of powder, improves the yield of powder.

[0005] The utility model provides a kind of ceramic powder pretreatment device, comprising:

[0006] The drum has an inner cylinder wall for accommodating the ceramic powder to be treated, and the axis of the drum is inclined relative to the horizontal direction, so that the open end of the drum is inclined upward. The profile of the inner cylinder wall of the drum along its axial direction is arc-shaped, so that the inside of the drum forms a cavity with a larger diameter in the middle than at both ends.

[0007] The driving device is connected to the drum and is used to drive the drum to rotate about its axis.

[0008] The at least one stirring member is arranged on the inner cylinder wall of the drum and is used to change the motion state of the powder in the drum when the drum rotates. The stirring member is an L-shaped plate, and the two free ends of the L-shaped plate are fixedly connected to the inner cylinder wall and the bottom wall of the drum, respectively. The connection between the L-shaped plate and the inner cylinder wall and the bottom wall forms a gap for the powder to pass through.

[0009] Optionally, a plurality of stirring members are arranged on the inner cylinder wall in a circumferential direction of the drum.

[0010] Optionally, the stirring member is inclinedly connected to the inner wall of the cavity of the drum.

[0011] Optionally, at least one through hole is provided on the stirring member.

[0012] Optionally, the ceramic powder pretreatment device further comprises:

[0013] The pneumatic spraying device is arranged at the open end of the drum and is used for spraying liquid into the drum.

[0014] Optionally, the pneumatic spraying device comprises:

[0015] A nozzle is arranged above the drum.

[0016] A liquid supply device is connected with the nozzle.

[0017] A pneumatic source is connected with the nozzle.

[0018] Optionally, the ceramic powder pretreatment device further comprises:

[0019] A heating device is arranged below the drum and is used for heating the ceramic powder in the drum.

[0020] Optionally, the inner drum wall is smooth.

[0021] According to the technical content disclosed by the present application, the following beneficial effects are achieved:

[0022] The ceramic powder pretreatment device provided by the present application can fully mix the ceramic powder in the drum through the inclined drum, the rotating drum and the L-shaped plate stirring piece arranged in the drum. The arc-shaped contour design of the inner drum wall of the drum forms a cavity with a larger middle diameter than two end diameters in the drum, which helps the powder to produce more complex motion trajectories in the rotating process, further improving the mixing uniformity. The two ends of the L-shaped plate are fixedly connected with the inner drum wall and the drum bottom wall respectively, and a gap is formed at the connection, which effectively prevents the accumulation of powder in the corner of the drum bottom, ensures the uniformity of the overall mixing and reduces the powder loss. Through the combination of the above structures, the present application can improve the powder morphology, adjust the water content and adhesion of the powder, improve the material yield of the powder, and thus improve the forming quality and production efficiency of the ceramic products.

[0023] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments thereof, taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0024] The accompanying drawings incorporated in and forming a part of the specification, illustrate embodiments of the present application and, together with the description, serve to explain the principles of the application.

[0025] Figure 1 is a first perspective view of the ceramic powder pretreatment device of the present application.

[0026] Figure 2The utility model discloses a ceramic powder pretreatment device second visual angle structure diagram.

[0027] Mark explanation: 1, the drum; 2, L type board; 3, drive arrangement; 4, pneumatic spraying device; 5, heating device. DETAILED DESCRIPTION

[0028] Various exemplary embodiments of the present utility model will now be described in detail with reference to the accompanying drawings. Note that the relative arrangement, numerical expressions, and numerical values of components and steps set forth in these embodiments are not limiting to the scope of the present utility model unless otherwise specifically stated.

[0029] The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the present utility model and its application or uses.

[0030] Techniques, methods, and apparatus known to those of ordinary skill in the relevant art can not be discussed in detail herein, but should be considered part of the specification as appropriate.

[0031] In all examples shown and discussed herein, any specific values should be interpreted as merely illustrative and not as limiting. Thus, other examples of the exemplary embodiments can have different values.

[0032] Note that like reference numerals and letters refer to like items in the several views, and as such, no further discussion on the same will be provided in subsequent views.

[0033] As shown in Figure 1 and Figure 2 The present embodiment provides a ceramic powder pretreatment device, mainly used for powder pretreatment in the production process of reactive plasma deposition (RPD) ceramic target material, and also applicable to other occasions requiring pretreatment of ceramic powder. The device comprises a drum 1, a drive device 3, a stirring element, a pneumatic spraying device 4 and a heating device 5.

[0034] The drum 1 is a cylindrical container with an inner cylinder wall for containing the ceramic powder to be treated. The axis of the drum 1 is arranged obliquely relative to the horizontal direction, with an oblique angle of 15° (which can be adjusted within a range of 5°-20°, the selection of the range is based on the following considerations: too small an angle, the axial mixing effect is not obvious; too large an angle, the powder is easy to slide down, and the mixing is uneven. 15° is the preferred angle verified by experiments). The open end of the drum 1 is tilted upward. This oblique design is beneficial to the loading and unloading of the powder, and enhances the mixing of the powder in the axial direction by gravity, because the inclined drum makes the powder produce an axial component of force in addition to the centrifugal force and the action of the stirring element during rotation, thereby producing axial movement. The profile of the inner cylinder wall of the drum 1 along its axial direction is arc-shaped, so that the inside of the drum 1 forms a cavity with a larger diameter in the middle than at both ends. This structure is beneficial to the generation of more complex movement trajectories of the powder during rotation of the drum, thereby improving the uniformity of mixing.

[0035] The driving device 3 is connected with the drum 1 for driving the drum 1 to rotate around its axis. The driving device 3 provides rotational power, which is the basis for the entire device to achieve powder mixing. The rotational speed of the driving device 3 can be adjusted to adapt to the pretreatment needs of different powders. The adjustable rotational speed makes the device have wider applicability, and the optimal rotational speed can be selected according to the characteristics of different powders. The driving device 3 can include a motor, a speed reducer, a frequency converter and other equipment, and the connection mode is all prior art, so it will not be described again. The rotational speed control of the driving device 3 is realized through the frequency converter, which can be steplessly adjusted according to the characteristics of the powder.

[0036] In this embodiment, the stirring element is a plurality of L-shaped plates 2 arranged along the circumference of the inner cylinder wall of the drum 1. The arrangement of multiple stirring elements can more fully stir the powder and improve the mixing efficiency. The arrangement along the circumference can make the powder fully mixed in the circumferential direction. Each L-shaped plate 2 is provided with a plurality of through holes, and the diameter of the through holes is 8mm (which can be adjusted within a range of 5-10mm, the selection of the range is based on the following considerations: too small a diameter, easy to block; too large a diameter, the stirring effect is weakened. 8mm is the preferred diameter verified by experiments). The design of the through holes allows part of the powder to pass through, increases the mixing opportunity of the powder, and avoids the generation of "dead corners". The shape of the L-shaped plate is beneficial to guiding the flow of the powder and reducing the impact and wear on the powder. Moreover, the two free ends of the L-shaped plate are fixedly connected to the inner cylinder wall and the bottom wall of the drum respectively, and the connection of the L-shaped plate with the inner cylinder wall and the bottom wall of the drum forms a gap for the powder to pass through, which can prevent the powder from accumulating in the corners at the bottom of the drum and ensure the uniformity of mixing. Preferably, the stirring element is obliquely connected with the inner wall of the cavity of the drum 1 to further enhance the stirring effect.

[0037] A pneumatic spraying device 4 is arranged above the open end of the drum 1 for spraying liquid (such as water or binder solution) into the drum 1. This device can precisely control the moisture content and cohesiveness of the powder to meet the requirements of subsequent forming processes. The device includes a nozzle, a liquid supply device, and a pneumatic source. The nozzle is arranged above the drum 1, the liquid supply device (such as a liquid tank and pump) is connected to the nozzle through a pipeline to provide the required liquid. The pneumatic source (such as an air compressor) is connected to the nozzle to provide air pressure to atomize the liquid into fine droplets and uniformly spray them onto the surface of the powder. Atomizing the liquid by air pressure can increase the contact area between the liquid and the powder, improving the uniformity of mixing. By adjusting the liquid flow and air pressure, the moisture content and cohesiveness of the powder can be precisely controlled. The spraying amount and spraying time of the spraying device can be precisely controlled by the control system.

[0038] A heating device 5 is arranged below the drum 1, in this embodiment an electric heating device is used (other heating methods such as hot air heating can also be used). The heating device can heat the ceramic powder in the drum 1 to reduce the moisture content of the powder, improve the loose state of the powder, and prevent the powder from caking. Heating can remove excess water from the powder, prevent the powder from caking during subsequent processing, and improve the flowability of the powder. The heating temperature and time can be adjusted according to the characteristics of the powder. The temperature control of the heating device is realized through temperature sensors and a control system, and the heating temperature and time can be set according to the characteristics of the powder.

[0039] The drum 1 and the L-shaped plate 2 are made of wear-resistant and corrosion-resistant stainless steel. The inner cylinder wall of the drum 1 is smooth, which helps to reduce the friction between the powder and the cylinder wall, promoting the free flow and mixing of the powder.

[0040] Working principle

[0041] Loading: The ceramic powder to be processed (such as RPD powder) is loaded into the drum from the open end of the drum 1.

[0042] Start: Start the drive device 3 to rotate the drum, and start the spraying device and / or heating device as needed.

[0043] Mixing: During the rotation of the drum 1, the L-shaped plate 2 produces a flow guiding and stirring effect on the powder, causing the powder to produce a complex motion trajectory. The powder is mixed in the radial, circumferential and axial directions under the action of gravity, centrifugal force and baffle. The through holes on the L-shaped plate 2 allow part of the powder to pass through, further increasing the mixing opportunity.

[0044] Spraying (optional): If it is necessary to adjust the cohesiveness or moisture content of the powder, start the pneumatic spraying device 4 to uniformly spray liquid into the powder.

[0045] Heating (optional): If it is necessary to reduce the moisture content of the powder or to improve the bulk state of the powder, the heating device 5 is started to heat the powder.

[0046] Discharging: After the pretreatment is completed, the rotation of the roller is stopped, and the treated powder is discharged from the open end of the roller 1.

[0047] Through the above structure and working principle, the ceramic powder pretreatment device can effectively solve the problems of poor powder morphology, uneven moisture content, and serious powder loss in the prior art, and realize efficient and uniform pretreatment of the ceramic powder.

[0048] Although some specific embodiments of the present application have been described in detail by examples, those skilled in the art should understand that the above examples are only for illustration, not for limiting the scope of the present application. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A ceramic powder pretreatment device, characterized by, The application relates to a ceramic powder pretreatment device. A drum (1) having an inner drum wall for accommodating ceramic powder to be treated, and the axis of the drum (1) is arranged to be inclined relative to the horizontal direction so that the open end of the drum (1) is inclined upward; the inner drum wall of the drum (1) is arc-shaped along the axial direction, so that the inner part of the drum (1) forms a cavity with a larger diameter in the middle than at both ends; A driving device (3) connected with the drum (1) for driving the drum (1) to rotate around the axis; At least one stirring piece arranged on the inner drum wall of the drum (1) for changing the movement state of the powder in the drum (1) when the drum (1) rotates; the stirring piece is an L-shaped plate (2), two free ends of the L-shaped plate (2) are fixedly connected with the inner drum wall and the bottom wall of the drum (1) respectively, and the connection part of the L-shaped plate (2) with the inner drum wall and the bottom wall forms a gap for passing the powder.

2. The apparatus for pre-treating ceramic powder of claim 1, wherein A plurality of stirring pieces are arranged on the inner drum wall along the circumferential direction of the drum (1).

3. A ceramic powder pretreatment device according to claim 1 or 2, characterized in that The stirring piece is inclinedly connected with the inner wall of the cavity of the drum (1).

4. A ceramic powder pretreatment device according to claim 1 or 2, characterized in that At least one through hole is arranged on the stirring piece.

5. A ceramic powder pretreatment apparatus according to claim 1 or 2, characterized in that, The ceramic powder pretreatment device further comprises: An air pressure type spraying device (4) arranged at the open end of the drum (1) for spraying liquid into the drum (1).

6. The apparatus for pre-treating ceramic powder of claim 5, wherein, The air pressure type spraying device (4) comprises: A nozzle arranged above the drum (1); A liquid supply device connected with the nozzle; An air pressure source connected with the nozzle.

7. A ceramic powder pretreatment apparatus according to claim 1 or 2, characterized in that The ceramic powder pretreatment device further comprises: A heating device (5) arranged below the drum (1) for heating the ceramic powder in the drum (1).

8. A ceramic powder pretreatment apparatus according to claim 1 or 2, characterized in that The inner drum wall of the drum (1) is smooth.

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