A ceramic ball impact resistance fragmentation rate testing machine and testing method

Abstract

The present invention discloses a ceramic ball impact crushing rate tester and a test method, the ceramic ball impact crushing rate tester comprises a ball selector; a ball inlet and a ball outlet provided on the ball selector; a collision pool located below the ball selector, into which the ceramic ball falls from the ball outlet; a transmission component, which is used to receive the ceramic ball from the collision pool, one end of the transmission component is close to the ball selector, and according to instructions, the ceramic ball is transferred to the direction of the ball selector or to the opposite direction of the ball selector; the transmission component is provided with a screening device, and the screening device is located between the falling point of the ceramic ball and the ball selector for screening out the ceramic ball with a minimum particle size less than a preset value. The crushing rate index of the ceramic grinding body can be estimated in advance to guide customers in production and use.

Description

Technical Field

[0001] The invention relates to the field of ceramic ball impact resistance, and in particular to a ceramic ball impact resistance crushing rate testing machine and a testing method. Background Art

[0002] Although ceramic materials have many advantages that other materials cannot match, their fatal weakness is also obvious, that is, their brittleness. The brittleness of ceramic materials greatly affects the reliability and consistency of material performance. These characteristics also appear in wear-resistant ceramic balls. Brittleness is the main factor leading to the breakage of grinding bodies. Cement grinding ceramic balls are used in relatively harsh environments and working conditions, so ordinary ceramic materials are not competent.

[0003] In order to ensure that the performance of ceramic balls can meet the working conditions of cement grinding, it is necessary to find a special wear-resistant ceramic product. At present, there is no equipment to detect the crushing rate of ceramic ball grinding bodies. Users generally calculate the crushing rate by comparing the number before loading with the number after grinding. The experimental cycle is long, about 40-60 days, and the quality of ceramic balls cannot be judged in advance. Therefore, testing and evaluating the quality of ceramic balls to estimate the crushing rate index of ceramic balls in advance and guide customers' production and use has become one of the difficult problems that the ceramic ball industry and the cement industry need to solve together. Summary of the invention

[0004] In order to solve the above technical problems, the object of the present invention is to provide a ceramic ball impact crushing rate testing machine and testing method.

[0005] According to one aspect of the present invention, there is provided a ceramic ball impact crushing rate testing machine, comprising:

[0006] ball selector;

[0007] A ball inlet and a ball outlet provided on the ball selector;

[0008] The collision pool is located below the ball selector, and the ceramic balls fall into the collision pool from the ball outlet;

[0009] The conveying assembly is used to receive the ceramic balls from the collision pool. One end of the conveying assembly is close to the ball selector, and according to the instruction, the ceramic balls are transferred to the direction of the ball selector or to the opposite direction of the ball selector.

[0010] The conveying assembly is provided with a screening device, which is located between the landing point for receiving the ceramic balls and the ball selector and is used to screen out ceramic balls whose minimum particle size is smaller than a preset value.

[0011] Furthermore, the conveying assembly includes a lower conveying device, an upper conveying device and a lifting conveying device, and the lifting conveying device is provided with a conveying belt and a lifting bucket arranged on the conveying belt;

[0012] Provided at the ball inlet and ball delivery port of the lifting and conveying device

[0013] The lower conveying device is used to receive the ceramic balls from the collision pool and transfer the ceramic balls to the ball inlet. The ceramic balls enter the lifting bucket through the ball inlet;

[0014] The upper conveying device, one end of the upper conveying device extends into the ball delivery port, and its function is to receive the ceramic balls from the lifting bucket and convey the ceramic balls to the ball inlet.

[0015] Furthermore, the landing point of the ceramic balls is located in the middle of the lower conveying device. The lower conveying device can convey the ceramic balls in the positive or negative direction. One end of the lower conveying device is provided with a lifting and conveying device, and the lifting and conveying device is used to convey the ceramic balls to the upper conveying device, and the upper conveying device 7 conveys the ceramic balls to the ball selector.

[0016] Furthermore, the screening device is located between the lower conveying device and the lifting and conveying device, or the screening device is located between the lifting and conveying device and the lower conveying device;

[0017] The screening device includes a transmission channel. The transmission channel includes a sieve plate composed of several metal rectangular bars. One end of the sieve plate is connected to the ball inlet area, and the ball inlet area is used to receive the ceramic balls from the lower conveying device. The other end of the sieve plate is connected to the ball outlet area, and the ball outlet area is used to send the ceramic balls into the ball inlet.

[0018] Furthermore, a bottom plate connected to the conveyor belt, and side plates are oppositely arranged on the bottom plate;

[0019] One end of the side plate is connected through a ball receiving plate, and the other end of the side plate is connected through a ball guiding plate;

[0020] The bottom plate, side plates, ball receiving plate, and ball guiding plate enclose a ball storage space. The included angle between the ball receiving plate and the bottom plate is 60 - 85°, and the included angle between the ball guiding plate and the bottom plate is not less than 140°.

[0021] Furthermore, the ball selector includes a ball selection chassis, and a container for receiving ceramic balls and a power mechanism for driving the container to rotate are arranged on the ball selection chassis;

[0022] Ball selection holes are arranged on the ball selection chassis. When the container rotates, the ball inlet coincides with the ball selection holes, and the ceramic balls fall into the collision pool through the ball inlet and the ball selection holes.

[0023] Furthermore, a ceramic ball acceleration mechanism is arranged between the ball selection chassis and the collision pool. The ceramic ball acceleration mechanism includes a hollow closed disk. A turntable is arranged inside the disk. The center of the turntable is communicated with the ball outlet, and the turntable is controlled by a motor to rotate at a constant speed;

[0024] A number of acceleration channels are provided on the turntable, and a ceramic ball outlet is arranged on the disc directly above the collision pool. When the ceramic ball reaches the ceramic ball outlet, the directions of both the linear velocity and the acceleration are vertically downward.

[0025] Furthermore, it further includes a control system, and the ball selector, the conveying assembly are signal-connected to the control system.

[0026] Furthermore, the control system is configured with a touch screen control operation panel, an inverter, an encoder, a PLC host, an expansion unit, an analog input unit, a transformer, and a filter, and parameters can be directly programmed and input to control the transmission speed of the ceramic balls and / or the ball entering speed and / or the impact speed. The ball entering speed refers to the speed at which the ceramic balls enter the collision pool from the ball selector.

[0027] According to one aspect of the present invention, there is provided a test method for the impact crushing rate of ceramic balls, including the following steps.

[0028] Including the following steps.

[0029] Select a number of ceramic balls to fill the collision pool and weigh them, denoted as m0.

[0030] Select a number of ceramic balls to be loaded into the ball selector and weigh them, denoted as m1.

[0031] Circulate the ceramic balls in the ball selector into the collision pool, so that the ball feeding speed of the ball selector is 1 ± 0.05 kg / min, and control the ceramic balls to vertically fall towards the collision pool at a speed of 8.90 ± 0.05 m / s.

[0032] Collect the undamaged ceramic balls and weigh them, denoted as m2. The damage of the ceramic balls includes the following situations: the size of the spalling layer on the surface of the grinding ball is greater than 50% of the diameter of the grinding body, or the mass loss rate of the grinding ball is greater than 20%, or the grinding ball breaks along the middle.

[0033] The impact duration of the ceramic balls is t, and calculate the crushing rate of the ceramic balls according to m0, m1, m2, and t.

[0034] Compared with the prior art, the beneficial effects of the present application are as follows:

[0035] 1. The present invention can detect the crushing rate of ceramic grinding media before customers purchase ceramic grinding media, can evaluate the crushing rate of ceramic grinding media in advance, and can also estimate the crushing rate index of ceramic grinding media in advance, guiding customers' production and use, promoting the development of the ceramic ball industry towards high strength, high wear resistance, and high impact toughness, and promoting the common progress of the ceramic grinding media industry and the cement industry.

[0036] 2. The transfer component of the present invention includes a lower transfer device, an upper transfer device, and a lifting transfer device, enabling the entire test process to achieve full automation without the need for manual operation in the middle, and having relatively strong operability.

[0037] 3. The turntable of the present invention is provided with a number of acceleration channels, allowing the ceramic balls to fall at any speed when thrown at any height.

[0038] 4. The bottom plate, side plates, ball-receiving plate, and ball-guiding plate of the lifting bucket of the present invention enclose a ball storage space. The included angle between the ball-receiving plate and the bottom plate is 60 - 85°, and the included angle between the ball-guiding plate and the bottom plate is not less than 140°. The 60 - 85° angle can ensure that the ceramic balls are smoothly received when falling into the lifting bucket, and when the top included angle is not less than 140°, the ceramic balls can be smoothly poured out during flipping; there is a gap at the bottom between the two lifting buckets, which can ensure that the ceramic balls will not be squeezed or collided with each other during flipping.

[0039] 5. The test method for the impact resistance and breakage rate of the ceramic balls of the present invention simulates the most severe impact process of the ceramic balls in the ball mill, that is, continuously dropping the ceramic balls freely from a certain height and hitting the collision plate repeatedly. The number of times of impact fatigue failure (ceramic ball breakage) reflects the impact fatigue life of the ceramic balls under this condition. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 is a schematic structural view of the present invention Figure 1 。

[0041] Figure 2 is a schematic structural view of the present invention Figure 2 。

[0042] Figure 3 is a schematic diagram of the control system module of the present invention.

[0043] Figure 4 is a schematic control diagram of the control system of the present invention.

[0044] Figure 5 is a schematic structural view of the ceramic ball acceleration mechanism of the present invention.

[0045] Figure 6 is a schematic structural view of the lower transfer device of the present invention.

[0046] Figure 7 is a schematic structural view of the screening device of the present invention.

[0047] Figure 8 is a schematic structural view of the lifting transfer device of the present invention.

[0048] Figure 9 is a schematic structural view of the lifting bucket.

[0049] Figure 10 It is a structural schematic diagram of a ball selector.

[0050] Reference numerals shown in the drawings: 1 - control system; 2 - ceramic ball acceleration mechanism; 21 - collision cell; 22 - disc; 23 - turntable; 24 - acceleration channel; 25 - outlet; 26 - motor; 27 - ball inlet; 3 - ball outlet; 4 - lower transmission device; 5 - screening device; 51 - sieve plate; 52 - ball inlet area; 53 - ball outlet area; 6 - lifting transmission device; 7 - upper transmission device; 8 - ball selector; 81 - ball selector chassis; 82 - container; 83 - power mechanism; 84 - ball selection hole; 9 - lifting bucket; 91 - side plate; 92 - ball receiving plate; 93 - ball guiding plate; 10 - ceramic ball. Specific embodiments

[0051] This embodiment provides a ceramic ball impact resistance crushing rate testing machine, including:

[0052] A ball selector 8, a ball inlet 27 and a ball outlet 3 provided on the ball selector 8, a collision cell 21 located below the ball selector 8, and the ceramic ball 10 falls into the collision cell 21 from the ball outlet 3; the ball selector 8 includes a ball selector chassis 81, a container 82 for receiving the ceramic ball 10 and a power mechanism 83 for driving the container 82 to rotate are provided on the ball selector chassis 81, the container inlet is the ball inlet 27 of the ball selector 8, the power mechanism 83 is a variable frequency motor 26, which is named the ball selection motor 26 for convenience of distinction, and the driving method can adopt common transmission methods such as gears or belts; a ball selection hole 84 is provided on the ball selector chassis 81, the container 82 rotates to make the ball outlet 3 coincide with the ball selection hole 84, and the ceramic ball 10 falls into the collision cell 21 through the ball outlet 3 and the ball selection hole 84. The ball selector 8 is composed of the ball selector chassis 81 and the variable frequency motor 26. The purpose of the ball selector 8 is to separate the balls one by one, prevent multiple balls from entering the acceleration system simultaneously, causing extrusion damage to the ceramic ball 10 and the equipment at the ceramic ball outlet 25, and also play a role in controlling the ball inlet rate; as Figure 10As shown, the ball selection chassis 81 is provided with ball outlets 3 arranged in an annular array. The ball selector 8 can separate the ceramic balls 10 and send them into the ball selection chassis 81 one by one, preventing multiple balls from entering the acceleration system simultaneously and causing congestion or shear at the outlet of the accelerator, thus avoiding potential safety hazards. As an alternative solution, a ceramic ball acceleration mechanism 2 is provided between the ball selection chassis 81 and the collision pool 21. The ceramic ball acceleration mechanism 2 includes a hollow and closed disk 22. A turntable 23 is arranged inside the disk 22. The center of the turntable 23 is communicated with the ball selection hole 84. The turntable 23 is controlled by a motor 26 to rotate at a constant speed. A number of acceleration channels 24 are arranged on the turntable 23. The disk 22 is provided with a ceramic ball outlet 25 directly above the collision pool 21. When the ceramic ball 10 reaches the ceramic ball outlet 25, the directions of both the linear velocity and the acceleration are vertically downward. The advantage of this design is that the acceleration of the ceramic ball 10 starts from 0, and there is no problem of collision between the ceramic ball 10 and the turntable 23 during the acceleration process (if the ceramic ball 10 directly collides with the turntable 23 after entering the acceleration system, the acceleration of the ceramic ball 10 may not be achieved). The speed of the turntable 23 is controllable. The ceramic ball 10 is input from the middle of the accelerating turntable 23. Through the acceleration of the turntable 23, the process of the ceramic ball 10 accelerating from rest is realized. The whole process is automated, and the output speed of the ceramic ball 10 can be arbitrarily controlled. The speed of the thrown ceramic ball 10 is controllable, and the running time between each acceleration channel 24 is controllable. The throwing direction of the ceramic ball 10 is consistent and controllable. The turntable 23 is controlled by a variable-frequency motor to rotate in a uniform circular motion. A collision pool 21 is arranged below the turntable 23 in the centrifugal direction. The disk 22 is provided with a ceramic ball outlet 25 directly above the collision pool 21. When the ceramic ball 10 reaches the ceramic ball outlet 25, the directions of both the linear velocity and the acceleration are vertically downward. The collision pool 21 is exactly located at the position where the ceramic ball 10 flies out along the tangent of the outlet 25, enabling a direct collision.

[0053] The conveying assembly is used to receive the ceramic balls 10 from the collision pool 21. One end of the conveying assembly is close to the ball selector 8, and it transfers the ceramic balls 10 towards the ball selector 8 or in the opposite direction of the ball selector 8 according to instructions. Specifically, the conveying assembly includes a lower conveying device 4, an upper conveying device 7, and a lifting conveying device 6. The lifting conveying device 6 is provided with a conveyor belt and lifting buckets 9 arranged on the conveyor belt, and also includes a ball inlet and a ball delivery port provided on the lifting conveying device 6. The higher end of the conveyor belt is close to the ball selector 8, and the lower end of the conveyor belt is close to the lower conveying device 4. The conveyor belt is driven by a lifting motor. The lifting bucket 9 includes a bottom plate connected to the conveyor belt, and side plates 91 are oppositely arranged on the bottom plate. One end of the side plate 91 is connected by a ball receiving plate 92, and the other end of the side plate 91 is connected by a ball guiding plate 93. The bottom plate, side plates 91, ball receiving plate 92, and ball guiding plate 93 enclose a ball storage space. The included angle between the ball receiving plate 92 and the bottom plate is 60 - 85°, and the included angle between the ball guiding plate 93 and the bottom plate is not less than 140°.

[0054] The lower conveying device 4 is composed of a lower conveyor belt and a lower frequency conversion motor. Its function is to receive the ceramic balls 10 from the collision pool 21 and transfer the ceramic balls 10 to the ball inlet. The ceramic balls 10 enter the lifting bucket 9 through the ball inlet. The landing point of the ceramic balls 10 is located in the middle of the lower conveying device 4. The lower conveying device 4 can transfer the ceramic balls 10 in the forward or reverse direction. The lifting conveying device 6 is located at the end of the lower conveying device 4 in the forward transmission direction. The lifting conveying device 6 is used to transfer the ceramic balls 10 to the upper conveying device 7. As Figure 6 shown, to prevent the ceramic balls from scattering, the lower conveyor belt can be covered with a housing. The upper conveying device 7 transfers the ceramic balls 10 to the ball selector 8. As an optional solution, a recovery hopper is provided at the other end of the lower conveying device 4 to transfer the ceramic balls 10 in the reverse direction to the recovery hopper.

[0055] The upper conveying device 7 is composed of an upper conveyor belt and an upper frequency conversion motor. One end of the upper conveying device 7 extends into the ball delivery port. Its function is to receive the ceramic balls 10 from the lifting bucket 9 and convey the ceramic balls 10 to the ball inlet 27.

[0056] A screening device 5 is provided between the landing point of the conveyed ceramic balls 10 and the ball selector 8 of the conveying assembly for screening out the ceramic balls 10 with the minimum particle size less than a preset value. The screening device 5 is located between the lower transmission device 4 and the lifting transmission device 6, or the screening device 5 is located between the lifting transmission device 6 and the lower transmission device 4. In this embodiment, the former is adopted; the screening device 5 includes a transmission channel, and the transmission channel includes a sieve plate 51 composed of a plurality of metal rectangular bars. One end of the sieve plate 51 is connected to the ball inlet area 52, and the ball inlet area 52 is used to receive the ceramic balls 10 from the lower transmission device 4. The other end of the sieve plate 51 is connected to the ball outlet area 53, and the ball outlet area 53 is used to send the ceramic balls 10 into the ball inlet.

[0057] As Figures 3-4 shown, it further includes a control system 1. The ball selector 8, the conveying assembly and the control system 1 are signal-connected. The control system 1 is configured with a touch screen control operation panel, a frequency converter, an encoder, a PLC host, an expansion unit, an analog input unit, a transformer, and a filter. Among them, the motor 26, the lifting motor 26, the upper frequency conversion motor 26, the lower frequency conversion motor 26, and the ball selection motor 26 are collectively referred to as the mechanical and power unit, and parameters can be directly programmed and input to control the mechanical and power unit, control the transmission speed of the ceramic balls 10, and the ball inlet speed of the ball selector 8. By changing the rotation speed of the turntable 23, the speed at which the ceramic balls 10 are thrown out of the ceramic ball outlet 25 can be changed. During the test of this embodiment, the falling speed of the ceramic balls 10 is controlled to be 8.90 ± 0.05 m / s. By changing the rotation speed of the ball selector 8, the ball sending speed of the ceramic balls 10 can be changed. The ceramic balls are sent into the collision pool through the ball selector for collision. After the collision, the damaged ceramic balls are screened out through the conveying assembly and the screening device, and the intact ceramic balls enter the ball selector again for collision, and the cycle continues.

[0058] This embodiment provides a test method for applying the above-mentioned ceramic ball impact resistance and breakage rate testing machine, including the following steps

[0059] Step 1: Select a number of ceramic balls to fill the collision pool. As an alternative, level the collision pool with a scraper, then take it out and weigh it, denoted as m0;

[0060] Step 2: Select a number of ceramic balls and put them into the ball selector, and weigh them, denoted as m1;

[0061] Step 3: Circulate the ceramic balls in the ball selector into the collision pool, so that the ball sending speed of the ball selector is 1 ± 0.05 kg / min, that is, according to the average mass of the ceramic balls, control the number of ceramic balls sent into the collision pool by the ball selector per minute. Specifically in this embodiment, that is, according to the average mass of the selected ceramic balls and the number of ball selection holes, control the rotation speed of the container; at the same time, control the ceramic balls to fall vertically into the collision pool at a speed of 8.90 ± 0.05 m / s;

[0062] Step 4: Collect the undamaged ceramic balls (i.e., intact ceramic balls) and weigh them, denoted as m2. The damage of ceramic balls includes the following situations: the size of the spalling layer on the surface of the grinding balls is greater than 50% of the diameter of the grinding body, or the mass loss rate of the grinding balls is greater than 20%, or the grinding balls are fractured along the middle part;

[0063] The impact duration of the ceramic balls is t. Calculate the breakage rate of the ceramic balls according to m0, m1, m2, and t. Specifically, the breakage rate of alumina ceramic grinding balls is determined by formula (D-1):

[0064]

[0065] In formula D-1:

[0066] P - breakage rate of ceramic balls, %·h-1;

[0067] t - running time of the testing machine, h;

[0068] m0 - mass of the balls being impacted in the impact pool, g;

[0069] m1 - mass of the impact balls used in the test, g;

[0070] m2 - mass of the intact ceramic balls after the test, g;

[0071] This implementation provides an implementation experiment with ceramic balls as an example. The test steps include:

[0072] Fill the collision pool of the testing machine with the prepared ceramic grinding balls and level them with a scraper as the samples to be impacted. Weigh its mass as m0 with a balance with an accuracy of 0.1 g.

[0073] Weigh the prepared ceramic grinding balls m1 (about 5 kg) as the impact samples for the test and load them into the ball feeding hopper;

[0074] Turn on the power switch of the testing machine and start the reverse button of the lower conveyor belt to recycle the excess balls on the conveyor belt;

[0075] Adjust the parameters of the motor to make the linear speed of the ball throwing by the turntable 8.90 ± 0.05 m / s;

[0076] Adjust the parameters of the ball selection motor to make the ball feeding speed of the ball selector 1 ± 0.05 kg / min;

[0077] Send the balls into the ceramic ball acceleration mechanism through the ball selector for collision testing, and set the running time of the equipment to 1 h;

[0078] After the test is completed, the ceramic balls are transported in the reverse direction to the recovery hopper. The ceramic balls in the collision cell and those in the recovery hopper are taken out and mixed. The mass m2 of the good grinding balls is weighed according to the selected ones.

[0079] Result calculation: The breakage rate of the alumina ceramic grinding balls is determined according to formula (D - 1):

[0080]

[0081] During data processing, the decimal part is rounded to 2 significant figures according to the rounding rule of GB / T 8170. For example, at the beginning, the mass m0 of the balls being impacted in the impact cell is 4302.20 g, the running time of the equipment is 1 h, the mass m1 of the impact balls for the test is 5006.60 g, and the mass m2 of the intact ceramic balls after the test is 9272.60 g. Then, calculated according to the formula, the impact breakage rate P of the ceramic balls = (5006.60 + 4302.20 - 92720.6) / 5006.60 g = 0.72%. The breakage rate detection of the ceramic grinding media can be carried out before the customer purchases the ceramic grinding media, the breakage rate of the ceramic grinding media can be evaluated in advance, and the breakage rate index of the ceramic grinding media can also be estimated in advance to guide the customer's production and use, promote the development of the ceramic ball industry towards high strength, high wear resistance, and high impact toughness, and promote the common progress of the ceramic grinding media industry and the cement industry.

[0082] The above description is only the preferred embodiment of the present application and the explanation of the applied technical principles. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the technical solutions formed by mutually replacing the above features with the (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. A ceramic ball impact resistance crushing rate testing machine, characterized in that it includes a ball selector; a ball inlet and a ball outlet provided on the ball selector; a collision pool located below the ball selector, and the ceramic balls fall into the collision pool from the ball outlet; a conveying assembly, which is used to receive the ceramic balls from the collision pool. One end of the conveying assembly is close to the ball selector, and it transfers the ceramic balls towards the ball selector or in the opposite direction of the ball selector according to instructions; the conveying assembly is provided with a screening device, and the screening device is located between the landing point of the received ceramic balls and the ball selector for screening out ceramic balls with the minimum particle size less than a preset value; the ball selector includes a ball selection chassis, and a container for receiving ceramic balls and a power mechanism for driving the container to rotate are arranged on the ball selection chassis; ball selection holes are arranged on the ball selection chassis. When the container rotates, the ball inlet coincides with the ball selection holes, and the ceramic balls pass through the ball inlet and the ball selection holes and fall into the collision pool; a ceramic ball acceleration mechanism is arranged between the ball selection chassis and the collision pool. The ceramic ball acceleration mechanism includes a hollow and closed disk. A turntable is arranged inside the disk. The center of the turntable is communicated with the ball outlet, and the turntable is controlled by a motor to rotate at a constant speed; a number of acceleration channels are arranged on the turntable. The disk is relatively arranged directly above the collision pool with a ceramic ball outlet. When the ceramic balls reach the ceramic ball outlet, the directions of the linear velocity and acceleration are both vertically downward; the conveying assembly includes a lower conveying device, an upper conveying device and a lifting conveying device. The lifting conveying device is provided with a conveyor belt and lifting buckets arranged on the conveyor belt; a ball inlet and a ball delivery port provided on the lifting conveying device; a lower conveying device, which is used to receive the ceramic balls from the collision pool and transfer the ceramic balls to the ball inlet, and the ceramic balls enter the lifting buckets through the ball inlet; an upper conveying device, one end of the upper conveying device extends into the ball delivery port, and its function is to receive the ceramic balls from the lifting buckets and convey the ceramic balls to the ball inlet.

2. The ceramic ball impact resistance crushing rate testing machine according to claim 1, characterized in that the landing point of the ceramic balls is located in the middle of the lower conveying device. The lower conveying device can convey the ceramic balls in the positive direction or the reverse direction. One end of the lower conveying device is provided with a lifting conveying device, and the lifting conveying device is used to convey the ceramic balls to the upper conveying device, and the upper conveying device conveys the ceramic balls to the ball selector.

3. The ceramic ball impact resistance crushing rate testing machine according to claim 1, characterized in that the screening device is located between the lower conveying device and the lifting conveying device, or the screening device is located between the lifting conveying device and the lower conveying device; the screening device includes a transmission channel. The transmission channel includes a sieve plate composed of a number of metal rectangular bars. One end of the sieve plate is connected to the ball inlet area, and the ball inlet area is used to receive the ceramic balls from the lower conveying device. The other end of the sieve plate is connected to the ball outlet area, and the ball outlet area is used to send the ceramic balls into the ball inlet.

4. The ceramic ball impact resistance crushing rate testing machine according to claim 1, characterized in that the lifting bucket includes: a bottom plate connected to the conveyor belt, and side plates are oppositely arranged on the bottom plate; One end of the side plate is connected through a ball receiving plate, and the other end of the side plate is connected through a ball guiding plate; The bottom plate, side plate, ball receiving plate, and ball guiding plate enclose a ball storage space. The included angle between the ball receiving plate and the bottom plate is 60 - 85°, and the included angle between the ball guiding plate and the bottom plate is not less than 140°.

5. The ceramic ball impact resistance and breakage rate testing machine according to claim 1, wherein, It further includes a control system, and the ball selector, transmission assembly are signal - connected to the control system.

6. The ceramic ball impact resistance and breakage rate testing machine according to claim 5, wherein, The control system is configured with a touch - screen control operation panel, a frequency converter, an encoder, a PLC host, an expansion unit, an analog input unit, a transformer, and a filter, and parameters can be directly programmed for input to control the transmission speed and / or the ball - entering speed and / or the impact speed of the ceramic balls.

7. A test method for the impact crushing rate of alumina ceramic balls, characterized in that, Conduct tests with the ceramic ball impact resistance and breakage rate testing machine according to any one of claims 1 - 6; Including the following steps, Select a number of alumina ceramic balls to fill the collision pool, weigh them, and record as m0; Select a number of alumina ceramic balls to be placed in the ball selector, weigh them, and record as m1; Circulate the alumina ceramic balls in the ball selector into the collision pool, so that the ball - sending speed of the ball selector is 1 ± 0.05 kg / min, and control the alumina ceramic balls to vertically fall into the collision pool at a speed of 8.90 ± 0.05 m / s; Collect the undamaged alumina ceramic balls and weigh them, record as m2. The damage of the alumina ceramic balls includes the following situations: the size of the spalling layer on the surface of the grinding ball is greater than 50% of the diameter of the grinding body, or the mass loss rate of the grinding ball is greater than 20%, or the grinding ball breaks along the middle; The impact duration of the alumina ceramic balls is t, and calculate the breakage rate of the alumina ceramic balls according to m0, m1, m2, and t; The breakage rate of the alumina ceramic grinding balls is determined according to formula D - 1; Formula D - 1 is: P = (m0 + m1 - m2) / (tm1)×100; In formula D - 1: P is the crushing rate of alumina ceramic balls, %·h -1 ; t is the running time of the testing machine, h; m0 is the mass of the balls being impacted in the impact pool, g; m1 is the mass of the impact balls for the test, g; m2 is the mass of the intact alumina ceramic balls after the test, g.

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