A ball milling device and method for preparing high-frequency and low-loss ceramic powder

Abstract

The invention relates to the technical field of ball milling devices, and discloses a ball milling device for preparing high-frequency and low-loss ceramic powders and a method for using the same. The grinding cylinder can swing, and a grinding chamber and a screening chamber are arranged in the grinding cylinder. Two grinding ball feeding devices are arranged on the grinding cylinder to convey grinding balls of different sizes into the grinding cylinder. In the initial stage of grinding, large-sized grinding balls are used for ball milling in a dropped state. In the middle stage of grinding, small-sized grinding balls are used for ball milling in a dropped state. In the final state of grinding, small-sized grinding balls are used for ball milling in a poured state, thereby improving the surface quality of particles while ensuring the grinding efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of ball milling devices, in particular to a ball milling device for preparing low-loss ceramic powder. Background Art

[0002] Ball milling is a commonly used preparation method in the preparation of high-frequency and low-loss ceramic powders.

[0003] In the prior art, it is often necessary to pour out the particles with grinding balls after grinding is completed, and then use a screen or other tool to separate the grinding balls from the particles. During the separation process, the particles are easily absorbed by the human body, which is not good for human health.

[0004] Grinding balls have different specifications and sizes. Grinding balls of different sizes have different effects in the ball milling process. Grinding balls with large diameters have large masses, and their kinetic energy in the ball milling process is relatively large, so the impact force is strong, and large particle samples can be effectively crushed into small particle samples. When the diameter of the ball milling ball is too large, it will cause more serious wear, and large consumption and energy waste will also increase the cost of ball milling. Although the energy of grinding balls with small diameters is relatively small, their volume is small, and more collision times are generated in the same grinding space, which increases the contact area with the sample, and the grinding effect is more significant, which can achieve fine grinding of sample materials, but their grinding efficiency is relatively low. In the prior art, grinding balls of the same size are used for grinding during the entire stage of ball milling. When large-sized grinding balls are used, the surface quality of the obtained particles is poor, and it cannot adapt to the grinding of smaller particles, while when small-sized grinding balls are used, the grinding efficiency is low.

[0005] When the grinding cylinder of the ball mill rotates at different speeds, the grinding balls in the cylinder may be in three basic states. When the speed is low, the grinding body and the material are brought to a height equal to the dynamic friction angle by the cylinder due to friction, and the grinding body and the material slide down, which is called the "dumping state", which has a grinding effect on the material, but has a small impact on the material; when the speed is too fast, the grinding body and the material rotate together with the cylinder under the action of their inertial centrifugal force (circular motion), which is called the "circulation state", and the grinding body has no impact and grinding effect on the material; when the speed is between the above two, the grinding body is lifted to a certain height and then thrown down, which is called the "throwing state", and the grinding body has a greater impact and grinding effect on the material, and the grinding efficiency is high. In the prior art, the speed of the ball mill remains unchanged from beginning to end, and it is impossible to adaptively and automatically adjust the speed of the ball mill according to different stages of the ball mill. Summary of the invention

[0006] The present invention provides a ball milling device and method for preparing high-frequency and low-loss ceramic powders, which are used to solve the above technical problems.

[0007] The present invention provides a ball milling device for preparing high-frequency low-loss ceramic powders, the device comprising a bracket, a swing bracket rotatably connected to the bracket via a pin shaft, one side of the swing bracket is connected to a first motor via a first transmission device, and the swing bracket is driven to swing via the first motor and the first transmission device; a grinding cylinder is rotatably arranged inside the swing bracket, one end of the grinding cylinder is connected to a second motor via a second transmission device, and the grinding cylinder is driven to rotate via the second motor and the second transmission device;

[0008] A plurality of monitoring systems are arranged on the peripheral wall inside the grinding cylinder, through which the grinding state is monitored. In addition, the monitoring system is also used to monitor the size of particles in the grinding process in real time.

[0009] Preferably, the monitoring system is composed of a camera and an illumination light source. Preferably, the monitoring system can be four groups, and each monitoring system can be provided with several groups of cameras and illumination light sources as required.

[0010] The grinding cylinder includes a grinding chamber and a screening chamber, and the grinding balls and particles are separated through the screening chamber.

[0011] A conical cylinder is arranged between the grinding chamber and the screening chamber, the opening of the conical cylinder is connected to the first screen cylinder, a first gate is arranged at the opening of the conical cylinder for opening and closing the opening, and a second screen cylinder is arranged outside the first screen cylinder. The first screen cylinder forms a first cavity, the first screen cylinder and the second screen cylinder form a second cavity, the second screen cylinder and the grinding cylinder form a third cavity, and the conical cylinder is provided with a second gate and a third gate corresponding to the second cavity and the third cavity, respectively.

[0012] The first gate, the second gate and the third gate are driven to open and close by air cylinders.

[0013] The grinding cylinder is provided with two grinding ball feeding devices, namely a first grinding ball feeding device and a second grinding ball feeding device. The first grinding ball feeding device is used to convey large-sized grinding balls into the grinding cylinder, and the second grinding ball feeding device is used to convey small-sized grinding balls into the grinding cylinder.

[0014] Preferably, the first grinding ball feeding device and the second grinding ball feeding device have the same structure.

[0015] Preferably, the grinding ball feeding device includes a grinding ball chamber, one side of the grinding ball chamber is provided with a spring and a push plate, the other side of the grinding ball chamber is provided with a third motor and a screw, the grinding balls are pushed toward the screw by the spring and the push plate, and the screw is driven to rotate by the third motor, thereby realizing quantitative delivery of the grinding balls.

[0016] A discharge gate is also provided on the side wall of the grinding cylinder. After the grinding is completed, the grinding particles and grinding balls are taken out through the discharge gate.

[0017] Preferably, it is provided with a display screen for displaying the internal conditions of the grinding cylinder monitored by the monitoring system.

[0018] Preferably, the first sieve cylinder and the second sieve cylinder are detachably connected to accommodate grinding balls of different sizes as required.

[0019] Preferably, in order to prevent the cylinder from being damaged, a protective cover is provided on the outside of the cylinder to protect the cylinder.

[0020] Preferably, the gate is matched with the corresponding opening on the conical cylinder, and the curvature of the gate is consistent with the curvature of the inner side wall of the conical cylinder.

[0021] A method for using a ball mill for preparing high-frequency and low-loss ceramic powders specifically comprises the following steps:

[0022] In the initial stage of grinding, the first grinding ball feeding device inputs large-sized grinding balls into the grinding cylinder, and the second motor drives the grinding cylinder to rotate. The ball milling state is monitored by the monitoring system, and a signal is sent to the control system to adjust the speed of the second motor to adjust the ball milling state to the throwing state;

[0023] The monitoring system monitors the particle size in real time. When the particle size is reduced to a first preset value, the second motor is turned off, the first motor is started to drive the grinding cylinder to tilt, the first gate is opened, and the particles and grinding balls enter the screening chamber, then the first gate is closed, the second motor is started, the particles are separated from the large-sized grinding balls, and the particles pass through the first sieve cylinder and the second sieve cylinder into the third chamber, then the third gate is opened, the first motor rotates to pour the particles back into the grinding cylinder, then the third gate is closed, and the first motor drives the grinding cylinder to return to the grinding state;

[0024] The second grinding ball feeding device inputs small-sized grinding balls into the grinding cylinder, and the second motor drives the grinding cylinder to rotate. The ball milling state is monitored by the monitoring system, and a signal is sent to the control system to adjust the speed of the second motor, so that the ball milling state is adjusted to the throwing state;

[0025] The monitoring system monitors the particle size in real time. When the particle size is reduced to a second preset value, a signal is sent to the control system to adjust the rotation speed of the second motor, so as to adjust the ball milling state to a pouring state and grind and trim the particles.

[0026] The monitoring system monitors the particle size in real time. When the particle size is reduced to the third preset value, the second motor is turned off, the first motor is started to drive the grinding cylinder to tilt, the first gate is opened, and the particles and grinding balls enter the screening chamber, and then the first gate is closed, the second motor is started, and the particles are separated from the small-sized grinding balls. The particles will pass through the first screen cylinder and the second screen cylinder into the third cavity, and the small-sized grinding balls pass through the first screen cylinder and remain in the second cavity, and then the third gate and the discharge gate are opened, the first motor rotates to discharge the particles from the grinding cylinder, and then the second gate and the third gate are opened respectively to recover the large-sized grinding balls and the small-sized grinding balls respectively.

[0027] The third preset value is smaller than the second preset value, and the second preset value is smaller than the first preset value.

[0028] The beneficial effects of the above technical solution of the present invention are as follows:

[0029] (1) In the initial stage of grinding, large-sized grinding balls are used for ball milling in a falling state. In the middle stage of grinding, small-sized grinding balls are used for ball milling in a falling state. In the final state of grinding, small-sized grinding balls are used for ball milling in a pouring state, thereby improving the surface quality of the particles while ensuring the grinding efficiency.

[0030] (2) After the ball milling is completed, the separation of the particles and the grinding balls is completed in the screening chamber inside the grinding cylinder, and no manual separation is required. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 The overall structure of the device of the present invention;

[0032] Figure 2 This is the grinding cylinder structure of the device of the present invention.

[0033] Among them: 1- bracket, 2- first motor, 3- first transmission device, 4- second motor, 5- second transmission device, 6- grinding cylinder, 7- swing bracket, 8- grinding chamber, 9- screening chamber, 10- first screen cylinder, 11- second screen cylinder, 12- first cavity, 13- second cavity, 14- third cavity, 15- conical cylinder, 16- spring, 17- push plate, 18- grinding ball chamber, 19- third motor, 20- screw, 21- monitoring system, 22- discharge gate. DETAILED DESCRIPTION

[0034] In order to make the technical problems, technical solutions and advantages to be solved by the present invention more clear, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0035] The invention provides a ball milling device for preparing high-frequency and low-loss ceramic powder.

[0036] according to Figure 1-Figure 2As shown, the device includes a bracket 1, on which a swing bracket 7 is rotatably connected via a pin shaft, one side of the swing bracket 7 is connected to a first motor 2 via a first transmission device 3, and the swing bracket 7 is driven to swing via the first motor 2 and the first transmission device 3; a grinding cylinder 6 is rotatably arranged inside the swing bracket 7, one end of the grinding cylinder 6 is connected to a second motor 4 via a second transmission device 5, and the grinding cylinder 6 is driven to rotate via the second motor 4 and the second transmission device 5.

[0037] A plurality of monitoring systems 21 are arranged on the inner peripheral wall of the grinding cylinder 6, and the grinding state is monitored by the monitoring system 21. In addition, the monitoring system 21 is also used to monitor the size of the particles in the grinding process in real time, wherein the monitoring system 21 is composed of a camera and an illumination light source. Preferably, the monitoring system 21 can be four groups, and each group of the monitoring system 21 can be provided with several groups of cameras and illumination light sources as needed.

[0038] The grinding cylinder 6 includes a grinding chamber 8 and a screening chamber 9, a conical cylinder 15 is arranged between the grinding chamber 8 and the screening chamber 9, the opening of the conical cylinder 15 is connected to the first screen cylinder 10, a first gate is arranged at the opening of the conical cylinder 15 for opening and closing the opening, and a second screen cylinder 11 is arranged outside the first screen cylinder 10. Among them, a first cavity 12 is formed in the first screen cylinder 10, a second cavity 13 is formed between the first screen cylinder 10 and the second screen cylinder 11, and a third cavity 14 is formed between the second screen cylinder 11 and the grinding cylinder 6, and a second gate and a third gate are respectively arranged on the conical cylinder 15 corresponding to the second cavity 13 and the third cavity 14.

[0039] The first gate, the second gate and the third gate are driven to open and close by air cylinders.

[0040] Two grinding ball feeding devices are provided on the grinding cylinder 6, namely a first grinding ball feeding device and a second grinding ball feeding device. The first grinding ball feeding device is used to convey large-sized grinding balls into the grinding cylinder 6, and the second grinding ball feeding device is used to convey small-sized grinding balls into the grinding cylinder 6. The first grinding ball feeding device and the second grinding ball feeding device have the same structure. The specific grinding ball feeding device includes a grinding ball chamber 18, one side of the grinding ball chamber 18 is provided with a spring 16 and a push plate 17, and the other side of the grinding ball chamber 18 is provided with a third motor 19 and a screw 20. The grinding balls are pushed toward the screw 20 by the spring 16 and the push plate 17, and the screw 20 is driven to rotate by the third motor 19, thereby realizing the quantitative delivery of the grinding balls.

[0041] A discharge gate 22 is also provided on the side wall of the grinding cylinder 6 , and after the grinding is completed, the grinding particles and grinding balls are taken out through the discharge gate 22 .

[0042] The method for using the ball milling device for preparing the high-frequency low-loss ceramic powder specifically comprises the following steps:

[0043] In the initial stage of grinding, the first grinding ball feeding device inputs large-sized grinding balls into the grinding cylinder 6, and the second motor 4 drives the grinding cylinder 6 to rotate. The ball milling state is monitored by the monitoring system 21, and a signal is sent to the control system to adjust the speed of the second motor 4, so that the ball milling state is adjusted to the throwing state;

[0044] The monitoring system 21 monitors the particle size in real time. When the particle size is reduced to a first preset value, the second motor 4 is turned off, the first motor 2 is started to drive the grinding cylinder 6 to tilt, the first gate is opened, and the particles and grinding balls enter the screening chamber 9, then the first gate is closed, the second motor 4 is started, the particles are separated from the large-sized grinding balls, and the particles pass through the first sieve cylinder 10 and the second sieve cylinder 11 into the third cavity 14, then the third gate is opened, the first motor 2 rotates to pour the particles back into the grinding cylinder 6, then the third gate is closed, and the first motor 2 drives the grinding cylinder 6 to return to the grinding state;

[0045] The second grinding ball feeding device inputs small-sized grinding balls into the grinding cylinder 6, and the second motor 4 drives the grinding cylinder 6 to rotate. The ball milling state is monitored by the monitoring system 21, and a signal is sent to the control system to adjust the speed of the second motor 4, so that the ball milling state is adjusted to the throwing state;

[0046] The monitoring system 21 monitors the particle size in real time. When the particle size is reduced to a second preset value, a signal is sent to the control system to adjust the rotation speed of the second motor 4, so as to adjust the ball milling state to a pouring state and grind and trim the particles.

[0047] The monitoring system 21 monitors the particle size in real time. When the particle size is reduced to a third preset value, the second motor 4 is turned off, the first motor 2 is started to drive the grinding cylinder 6 to tilt, and the first gate is opened to allow the particles and grinding balls to enter the screening chamber 9. Then the first gate is closed, and the second motor 4 is started to separate the particles from the small-sized grinding balls. The particles will pass through the first screen cylinder 10 and the second screen cylinder 11 into the third cavity 14. The small-sized grinding balls pass through the first screen cylinder 10 and remain in the second cavity 13. Then the third gate and the discharge gate 22 are opened, and the first motor 2 rotates to discharge the particles from the grinding cylinder 6. Then the second gate and the third gate are opened respectively to recover the large-sized grinding balls and the small-sized grinding balls respectively.

[0048] The third preset value is smaller than the second preset value, and the second preset value is smaller than the first preset value.

[0049] The device is provided with a display screen for displaying the internal conditions of the grinding cylinder 6 monitored by the monitoring system 21 .

[0050] The first sieve drum 10 and the second sieve drum 11 are detachably connected to accommodate grinding balls of different sizes as required.

[0051] In order to prevent the cylinder from being damaged, a protective cover is arranged on the outside of the cylinder to protect the cylinder.

[0052] The gate is matched with the corresponding opening on the conical cylinder, and the curvature of the gate is consistent with the curvature of the inner wall of the conical cylinder. The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A ball milling device for preparing high-frequency and low-loss ceramic powders, characterized in that: The device comprises a bracket, a swing bracket is rotatably connected to the bracket via a pin shaft, one side of the swing bracket is connected to a first motor via a first transmission device, and the swing bracket is driven to swing via the first motor and the first transmission device; a grinding cylinder is rotatably arranged inside the swing bracket, one end of the grinding cylinder is connected to a second motor via a second transmission device, and the grinding cylinder is driven to rotate via the second motor and the second transmission device; A plurality of monitoring systems are arranged on the peripheral wall of the grinding cylinder to monitor the grinding state. In addition, the monitoring system is also used to monitor the size of particles in the grinding process in real time. The grinding cylinder includes a grinding chamber and a screening chamber, and the grinding balls and particles are separated through the screening chamber; A conical cylinder is arranged between the grinding chamber and the screening chamber, the opening of the conical cylinder is connected to the first screen cylinder, a first gate is arranged at the opening of the conical cylinder for opening and closing the opening, and a second screen cylinder is arranged outside the first screen cylinder; wherein the first screen cylinder forms a first cavity, the first screen cylinder and the second screen cylinder form a second cavity, the second screen cylinder and the grinding cylinder form a third cavity, and the conical cylinder is provided with a second gate and a third gate corresponding to the second cavity and the third cavity respectively; The grinding cylinder is provided with two grinding ball feeding devices, namely a first grinding ball feeding device and a second grinding ball feeding device. The first grinding ball feeding device is used to feed large-sized grinding balls into the grinding cylinder, and the second grinding ball feeding device is used to feed small-sized grinding balls into the grinding cylinder. A discharge gate is also provided on the side wall of the grinding cylinder. After the grinding is completed, the particles and grinding balls are taken out through the discharge gate. The method for using the ball milling device for preparing high-frequency low-loss ceramic powder comprises the following steps: In the initial stage of grinding, the first grinding ball feeding device inputs large-sized grinding balls into the grinding cylinder, and the second motor drives the grinding cylinder to rotate. The ball milling state is monitored by the monitoring system, and a signal is sent to the control system to adjust the speed of the second motor to adjust the ball milling state to the throwing state; The monitoring system monitors the particle size in real time. When the particle size is reduced to a first preset value, the second motor is turned off, the first motor is started to drive the grinding cylinder to tilt, the first gate is opened, and the particles and grinding balls enter the screening chamber, then the first gate is closed, the second motor is started, the particles are separated from the large-sized grinding balls, and the particles pass through the first sieve cylinder and the second sieve cylinder into the third chamber, then the third gate is opened, the first motor rotates to pour the particles back into the grinding cylinder, then the third gate is closed, and the first motor drives the grinding cylinder to return to the grinding state; The second grinding ball feeding device inputs small-sized grinding balls into the grinding cylinder, and the second motor drives the grinding cylinder to rotate. The ball milling state is monitored by the monitoring system, and a signal is sent to the control system to adjust the speed of the second motor, so that the ball milling state is adjusted to the throwing state; The monitoring system monitors the particle size in real time. When the particle size is reduced to a second preset value, a signal is sent to the control system to adjust the rotation speed of the second motor, so as to adjust the ball milling state to a pouring state and grind and trim the particles. The monitoring system monitors the particle size in real time. When the particle size is reduced to a third preset value, the second motor is turned off, the first motor is started to drive the grinding cylinder to tilt, the first gate is opened, and the particles and grinding balls enter the screening chamber, then the first gate is closed, the second motor is started, the particles are separated from the small-sized grinding balls, the particles will pass through the first screen cylinder and the second screen cylinder to enter the third chamber, the small-sized grinding balls pass through the first screen cylinder and remain in the second chamber, then the third gate and the discharge gate are opened, the first motor rotates to discharge the particles from the grinding cylinder, then the first gate and the second gate are opened respectively, and the large-sized grinding balls and the small-sized grinding balls are recovered respectively; The third preset value is smaller than the second preset value, and the second preset value is smaller than the first preset value.

2. The ball milling device for preparing high-frequency low-loss ceramic powder according to claim 1, characterized in that: The monitoring system consists of a camera and a lighting source.

3. The ball milling device for preparing high-frequency low-loss ceramic powder according to claim 2, characterized in that: The monitoring system is set up in four groups, and each monitoring system is equipped with several groups of cameras and lighting sources as needed.

4. The ball milling device for preparing high-frequency low-loss ceramic powder according to claim 1, characterized in that: The first gate, the second gate and the third gate are driven to open and close by air cylinders.

5. The ball milling device for preparing high-frequency low-loss ceramic powder according to claim 1, characterized in that: The first grinding ball feeding device and the second grinding ball feeding device have the same structure.

6. The ball milling device for preparing high-frequency low-loss ceramic powder according to claim 5, characterized in that: The grinding ball feeding device includes a grinding ball chamber, one side of the grinding ball chamber is provided with a spring and a push plate, and the other side of the grinding ball chamber is provided with a third motor and a screw. The grinding balls are pushed toward the screw by the spring and the push plate, and the screw is driven to rotate by the third motor, thereby realizing quantitative transportation of the grinding balls.

7. The ball milling device for preparing high-frequency low-loss ceramic powder according to claim 1, characterized in that: It is provided with a display screen for displaying the internal conditions of the grinding cylinder monitored by the monitoring system.

8. The ball milling device for preparing high-frequency low-loss ceramic powder according to claim 1, characterized in that: The first sieve cylinder and the second sieve cylinder are detachably connected to accommodate grinding balls of different sizes as required.

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