High-chromium grinding ball heat treatment equipment

Abstract

The invention discloses high-chromium grinding ball heat treatment equipment which comprises a pretreatment unit used for receiving heated high-temperature high-chromium grinding balls and carrying out cooling pretreatment on the high-temperature high-chromium grinding balls; the cooling unit is used for receiving the high-chromium grinding balls passing through the pretreatment unit and cooling the high-chromium grinding balls, and the cooling unit is communicated with the pretreatment unit through a steam recovery pipeline; according to the heat treatment equipment provided by the invention, the grinding balls subjected to high-temperature treatment firstly enter the first shell to be pretreated and cooled, so that the grinding balls are prevented from being directly cooled or directly exposed in air, and cracking caused by overlarge temperature difference between the inside and the outside is avoided; according to the heat treatment equipment provided by the invention, the cooling liquid sprayed by the spray head in the cooling unit is specifically water, the cooling liquid is evaporated to generate steam when encountering high-temperature grinding balls, and the steam enters the pretreatment unit through the steam recovery pipeline to be recycled, so that the use cost of the equipment can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of grinding ball production and processing, and particularly to a heat treatment device for high-chromium grinding balls. Background Art

[0002] As the core grinding medium of grinding equipment such as ball mills, grinding balls are widely used in the material grinding processes of industries such as cement, mines, and thermal power generation. Their quality is directly related to the grinding efficiency, energy consumption, and service life of the equipment. In the current commonly used manufacturing process of high-chromium alloy cast iron grinding balls in the industry, the heat treatment link has a decisive impact on the mechanical properties of the final product.

[0003] In the traditional production process, after the grinding balls are subjected to high-temperature austenitization, a direct quenching and cooling process (such as water quenching, oil quenching, or polymer quenching medium) is usually adopted in order to obtain a high-hardness martensite structure through rapid cooling. However, too fast a temperature drop during the heat treatment of grinding balls will lead to disadvantages such as increased thermal stress, non-uniform structure, and increased cracking tendency. Therefore, during the heat treatment process, an appropriate cooling rate and process should be adopted to avoid these problems and improve the quality and performance of the grinding balls. Summary of the Invention

[0004] To solve the technical problems existing in the background art, the present invention proposes a heat treatment device for high-chromium grinding balls.

[0005] The heat treatment device for high-chromium grinding balls proposed by the present invention includes: a pretreatment unit for receiving the heated high-temperature high-chromium grinding balls and performing a temperature reduction pretreatment on them;

[0006] a cooling unit for receiving the high-chromium grinding balls after passing through the pretreatment unit and performing a cooling treatment on them.

[0007] The pretreatment unit includes a first housing arranged obliquely, the high-position end of the first housing is open, the cooling unit is located below the pretreatment unit, and the low-position end of the first housing has a first channel communicating with the cooling unit.

[0008] Preferably, the cooling unit includes a second housing, a transmission rod, a spiral blade, and a power mechanism. The transmission rod is coaxially and rotatably installed in the second housing, the spiral blade is fixed on the transmission rod, the power mechanism is drivingly connected to the transmission rod to drive the transmission rod to rotate, the second housing is provided with a plurality of parallel grooves along its length direction, and the cooling unit further includes a plurality of nozzles. The coolant sprayed by the plurality of nozzles can be sprayed into the second housing through the grooves.

[0009] Preferably, the friction coefficient between the spiral blade and the high-chromium grinding balls is greater than the friction coefficient between the inner wall of the second housing and the high-chromium grinding balls.

[0010] A heat treatment device for high-chromium grinding balls proposed by the present invention further includes a third housing, and the cooling unit is located inside the third housing.

[0011] Preferably, the coolant is specifically water, and a steam recovery pipeline is installed on the third housing.

[0012] Preferably, the outlet end of the steam recovery pipeline is communicated with the first housing.

[0013] Preferably, the second housing and the third housing are arranged obliquely, and the oblique direction is the same as that of the first housing.

[0014] Preferably, a coolant recovery channel is further provided at the lower end of the third housing.

[0015] For the heat treatment device proposed by the present invention, the grinding balls after high-temperature treatment first enter the first housing for pre-treatment cooling, avoiding direct cooling of the grinding balls or direct exposure to the air, resulting in cracking due to excessive internal and external temperature differences.

[0016] For the heat treatment device proposed by the present invention, the grinding balls after pre-treatment enter the second housing. The spiral fins in the second housing can not only push the grinding balls forward but also adjust the forward speed of the grinding balls by adjusting its rotation speed. When the grinding balls move in the second housing, the nozzles spray coolant on the grinding balls for cooling.

[0017] For the heat treatment device proposed by the present invention, the coolant sprayed by the nozzles is specifically water. When the coolant meets the high-temperature grinding balls, it evaporates to generate steam, and the steam enters the pre-treatment unit through the steam recovery pipeline for recycling, thereby reducing the use cost of this device. Description of the Drawings

[0018] Figure 1 It is a front sectional view of the overall structure of a heat treatment device for high-chromium grinding balls proposed by the present invention;

[0019] Figure 2 It is a side sectional view of the internal mechanism of the second housing of a heat treatment device for high-chromium grinding balls proposed by the present invention. Detailed Embodiments

[0020] Referring to Figure 1 , a heat treatment device for high-chromium grinding balls proposed by the present invention includes:

[0021] A pre-treatment unit 1 for receiving the heated high-temperature high-chromium grinding balls and performing pre-cooling treatment on them;

[0022] A cooling unit 2 for receiving the high-chromium grinding balls after passing through the pre-treatment unit 1 and performing cooling treatment on them;

[0023] Among them, the pretreatment unit 1 includes a first housing 11 arranged obliquely. The high-position end of the first housing 11 is open. The cooling unit 2 is located below the pretreatment unit 1, and the low-position end of the first housing 11 has a first channel 12 communicating with the cooling unit 2.

[0024] The calcined grinding balls are added into the first housing 11 through the open opening at the high-position end of the first housing 11, and slide down to the low-position end of the first housing 11 under the action of gravity in the obliquely arranged first housing 11. In addition, a conveyor belt can be installed in the first housing 11 to adjust the moving speed of the grinding balls in the first housing 11 in the direction of the cooling unit 2.

[0025] In the above embodiment, the cooling unit 2 includes a second housing 21, a transmission rod 22, a spiral blade 23, and a power mechanism 24. The transmission rod 22 is coaxially and rotatably installed in the second housing 21. The spiral blade 23 is fixed on the transmission rod 22. The power mechanism 24 is drivingly connected to the transmission rod 22 to drive the transmission rod 22 to rotate. A plurality of parallel grooves 211 are formed in the second housing 21 along its length direction. The cooling unit 2 further includes a plurality of nozzles 25. The coolant sprayed by the plurality of nozzles 25 can be sprayed into the second housing 21 through the grooves 211. For details, refer to Figure 2 .

[0026] The pretreated grinding balls enter the second housing 21 through the first channel 12. The power mechanism 24 drives the transmission rod 22 and the spiral blade 23 to rotate. The spiral blade 23 can drive the grinding balls in the second housing 21 to move towards the second channel at the other end of the second housing 21. When moving in the second housing 21, the nozzles 25 communicating with the external coolant supply system spray coolant into the second housing 21 through the grooves 211 for cooling operation. The coolant is specifically cooling water.

[0027] In the above embodiment, the friction coefficient between the spiral blade 23 and the high-chromium grinding balls is greater than the friction coefficient between the inner wall of the second housing 21 and the high-chromium grinding balls, so that the spiral blade 23 can drive the grinding balls to rotate while pushing the high-chromium grinding balls to move, so that the grinding balls can contact the coolant more evenly.

[0028] It should be further noted that, for the convenience of recycling the coolant and to avoid the steam generated when the high-temperature grinding balls contact the coolant from hurting people, the processing equipment proposed by the present invention further includes a third housing 4. The cooling unit 2 is located in the third housing 4, and a steam recovery pipeline 5 is installed on the third housing 4.

[0029] In the above embodiment, the outlet end of the steam recovery pipeline 5 is communicated with the first housing 11. The steam recovery pipeline 5 includes a main pipeline communicated with the third housing 4 and a plurality of branch pipelines communicated with the first housing 11. When the coolant is sprayed onto the high-temperature grinding balls, steam will be generated. The steam enters the first housing 11 along the steam recovery pipeline 5 and is sprayed onto the grinding balls, avoiding drawbacks such as increased thermal stress, non-uniform structure, and increased cracking tendency of the grinding balls due to excessive temperature difference between their inside and outside.

[0030] It should be further noted that the temperature of the grinding balls entering the second housing 21 is higher than 100 degrees.

[0031] In the above embodiment, the second housing 21 and the third housing 4 are arranged obliquely, and the oblique direction is the same as that of the first housing 11. The second housing 21 is arranged obliquely, so that the grinding balls can move towards the second channel direction by their own gravity in the second housing 21, reducing the power of the power mechanism 24, thereby saving costs. In addition, the third housing 4 is arranged obliquely, so that the steam can move towards the steam recovery pipeline 5 along the top wall of the third housing 4 arranged obliquely, facilitating the recovery and utilization of the steam.

[0032] A coolant recovery channel is further provided at the low position end of the third housing 4.

[0033] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A high-chromium grinding ball heat treatment device, characterized in that, Comprising: A pretreatment unit (1) for receiving the heated high-temperature high-chromium grinding balls and performing a cooling pretreatment on them; A cooling unit (2) for receiving the high-chromium grinding balls after passing through the pretreatment unit (1) and performing a cooling treatment on them.

2. The high-chromium grinding ball heat treatment equipment according to claim 1, characterized in that, The pretreatment unit (1) includes a first housing (11) arranged obliquely. The high-position end of the first housing (11) is open. The cooling unit (2) is located below the pretreatment unit (1), and the low-position end of the first housing (11) has a first channel (12) communicating with the cooling unit (2).

3. The high-chromium grinding ball heat treatment equipment according to claim 2, characterized in that, The cooling unit (2) includes a second housing (21), a transmission rod (22), a spiral blade (23), and a power mechanism (24). The transmission rod (22) is coaxially and rotatably installed in the second housing (21). The spiral blade (23) is fixed on the transmission rod (22). The power mechanism (24) is drivingly connected to the transmission rod (22) to drive the transmission rod (22) to rotate. A plurality of parallel grooves (211) are formed in the second housing (21) along its length direction. The cooling unit (2) further includes a plurality of spray nozzles (25). The coolant sprayed by the plurality of spray nozzles (25) can be sprayed into the second housing (21) through the grooves (211).

4. The high-chromium grinding ball heat treatment equipment according to claim 3, characterized in that, The friction coefficient between the spiral blade (23) and the high-chromium grinding balls is greater than the friction coefficient between the inner wall of the second housing (21) and the high-chromium grinding balls.

5. The high-chromium grinding ball heat treatment equipment according to claim 3, characterized in that, It further includes a third housing (4), and the cooling unit (2) is located inside the third housing (4).

6. The heat treatment equipment for high chromium grinding balls according to claim 5, characterized in that, The coolant is specifically water, and a steam recovery pipe (5) is installed on the third housing (4).

7. The high-chromium grinding ball heat treatment equipment according to claim 5, characterized in that The outlet end of the steam recovery pipe (5) communicates with the first housing (11).

8. The high-chromium grinding ball heat treatment equipment according to claim 1, characterized in that The second housing (21) and the third housing (4) are arranged obliquely, and the oblique direction is the same as that of the first housing (11).

9. The heat treatment equipment for high chromium grinding balls according to claim 5, wherein, A coolant recovery channel is further provided at the low-position end of the third housing (4).

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