Chromite powder grinding device

Abstract

The invention relates to the technical field of chromite processing, in particular to a chromite powder grinding device which comprises a machine shell, a screening plate is fixedly installed at the lower end in the machine shell, a grinding disc is rotatably installed at the center of the screening plate, and a discharging mechanism for discharging chromite is arranged in the machine shell. According to the chromite powder grinding device, grinding operation of chromite is completed through the integrated operation model of discharging, grinding and material turning, uniform material distribution and stable grinding force are guaranteed while uniform gaps between the grinding rollers and the grinding disc are guaranteed, and therefore material accumulation is avoided, quantitative, intermittent and uniform discharging of materials is guaranteed, and the working efficiency is improved. Meanwhile, fine powder is discharged in time through airflow control optimization, uniform granularity is ensured, accumulation of the fine powder is avoided, the grinding efficiency and the product quality are remarkably improved, equipment abrasion is reduced, and efficient, stable and environment-friendly grinding operation is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of chromite processing, and particularly to a chromite powder grinding device. Background Art

[0002] Chromite is an important chromium-containing mineral, mainly composed of chromium oxide and iron oxide, with high hardness, high temperature resistance and chemical stability. It is widely used in the metallurgical industry, refractory materials, chemical industry, and casting and abrasive industries. In order to meet the requirements of different industrial applications for the particle size, mixing and processing performance of chromite, it is necessary to grind chromite before use to improve the reaction efficiency, uniformity and utilization rate of chromite.

[0003] At present, there are still the following disadvantages when grinding chromite: 1. Usually, chromite is directly poured onto the grinding disc, and then the chromite is ground by the cooperation between the grinding disc and the grinding roller. During the grinding process, the chromite will move to the between the grinding roller and the grinding disc as the grinding disc rotates. However, the direct pouring method will cause excessive accumulation of chromite on the grinding disc, resulting in uneven distribution of chromite, which in turn leads to a reduction in the contact area between the grinding roller and the grinding disc, a decrease in the grinding effect of chromite powder, and at the same time, the accumulated chromite will also increase the load on the grinding roller and the grinding disc, accelerating the wear of the equipment, thus shortening the service life of the device.

[0004] 2. During the grinding process, the chromite that has been ground into powder will directly fall onto the upper end surface of the grinding disc and be covered by the massive chromite. At this time, it is difficult to effectively separate and collect the powdered chromite, the purity and quality of the powdered material are affected, and the collection efficiency is reduced. At the same time, the powdered material accumulates on the grinding disc, which may also block the equipment or affect the normal operation of the grinding disc, increasing the risk of equipment failure. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention provides a chromite powder grinding device, which is achieved by the following specific technical means: A chromite powder grinding device includes a machine shell. A screening plate is fixedly installed at the lower end inside the machine shell. A grinding disc is rotatably installed at the center of the screening plate. A feeding mechanism for feeding chromite is arranged inside the machine shell.

[0006] A plurality of grinding machine boxes are circumferentially and evenly distributed on the outer circumferential wall of the machine shell above the screening plate. Grinding rollers are arranged at one end of the plurality of grinding machine boxes close to each other. Concentric grooves are formed on the grinding disc, and the concentric grooves are used to cooperate with the grinding rollers to grind chromite and make the chromite concentrate in the grinding area. A lower triangular support for providing triangular stable support to the grinding rollers is jointly arranged among the plurality of grinding rollers.

[0007] A hydraulic driving part for adjusting the grinding pressure of the grinding rollers and a connecting part connected to the screening plate are arranged on the grinding machine box.

[0008] The blanking mechanism includes a blanking part arranged inside the casing and intermittently blanking between adjacent grinding rollers following the rotation of the grinding disc, and a load-bearing part that provides support for the blanking part and the lower triangular bracket. The load-bearing part and the lower triangular bracket form a triangular prism-shaped support structure, and several grinding rollers are mutually restricted through the triangular prism-shaped support structure.

[0009] On the upper end face of the screening plate, a drive shaft located between adjacent grinding rollers is rotatably installed through a bearing seat arranged. On the drive shaft, there are turning fan blades and a rotating part. Through the rotating part, the drive shaft drives the turning fan blades to rotate to turn the chromite ore during grinding, and at the same time, the turning trajectory is guided through the concentric groove and the lower limit of the grinding roller is implemented.

[0010] A discharging mechanism is arranged on the casing; the discharging mechanism includes an air supply part and a discharging part respectively arranged at the upper and lower ends of the casing. The air supply part provides an air flow from top to bottom inside the casing to lift the ground chromite ore powder, and the discharging part sucks out the lifted chromite ore powder from the casing.

[0011] As a preferred technical solution of the present invention, the screening plate is assembled by a plurality of sector plates, and a first motor with an output end fixedly connected to the grinding disc is fixedly installed on the lower end face inside the casing.

[0012] As a preferred technical solution of the present invention, the grinding machine casing is connected to the grinding roller through a bearing arranged. At the center of the end face where the grinding rollers are close to each other, a snap ring is installed through a bearing, and a connecting ring movably connected to the snap ring is fixedly installed on the lower triangular bracket.

[0013] As a preferred technical solution of the present invention, the hydraulic driving part includes a support fixed on the outer ring wall at the lower end of the casing, and a hydraulic driving element is jointly arranged between the support and the corresponding grinding machine casing.

[0014] As a preferred technical solution of the present invention, the connecting part includes a connecting component arranged on the upper end face of the screening plate. The connecting component consists of two connecting support rods symmetrical about the corresponding grinding machine casing. A transverse support rod fixedly penetrating the corresponding grinding machine casing is jointly rotatably installed between the two connecting support rods in the same group; a second motor with an output end fixedly connected to the corresponding grinding roller is fixedly installed inside the grinding machine casing through a motor seat arranged.

[0015] As a preferred technical solution of the present invention, the blanking part includes a first-stage blanking cylinder fixedly installed inside the casing through a provided support rod. The upper end face of the lower triangular bracket is fixedly installed with a second-stage blanking cylinder coaxial with the first-stage blanking cylinder. A connecting shaft that rotatably penetrates the center of the lower end face of the second-stage blanking cylinder is fixedly installed at the center of the upper end face of the grinding disc. A transfer cylinder fixedly connected to the upper end of the connecting shaft is rotatably installed at the axis of the second-stage blanking cylinder through a bearing. The upper end of the transfer cylinder is connected to the lower end of the first-stage blanking cylinder through a provided bearing. A blanking port located between adjacent grinding rollers is formed through the outer ring wall of the second-stage blanking cylinder. A blanking channel cooperating with the blanking port is formed through the outer ring wall of the transfer cylinder; the center of the lower end face inside the transfer cylinder is conical.

[0016] As a preferred technical solution of the present invention, the load-bearing part includes an upper triangular bracket fixedly installed inside the casing and directly above the lower triangular bracket. An annular bracket is fixedly installed inside the upper triangular bracket through a provided support rod. The annular bracket is coaxially fixed outside the first-stage blanking cylinder. Connecting rods fixedly connected to the lower triangular bracket are fixedly installed at the midpoints of the three sides of the upper triangular bracket.

[0017] As a preferred technical solution of the present invention, the rotating part includes rollers fixedly sleeved on the outer ring wall of the driving shaft. Conical support wheels are fixedly installed at the mutually approaching ends of the driving shafts. Both the conical support wheels and the rollers are in contact with the upper end face of the grinding disc. Reinforcing connectors corresponding to the driving shafts one by one and used to ensure that both the conical support wheels and the rollers are in stable contact with the grinding disc are fixedly installed on the screening plate; a number of weight-reducing holes are evenly distributed in an array on the turning fan blades.

[0018] As a preferred technical solution of the present invention, the air supply part includes a third motor fixedly installed on the upper end face of the casing. The output end of the third motor is fixedly sleeved with a rotor blade located inside the casing and directly above the first-stage blanking cylinder.

[0019] As a preferred technical solution of the present invention, the discharging part includes a number of material suction inlets formed on the upper end face of the screening plate and evenly distributed along its circumference. A material suction channel communicating with the number of material suction inlets is formed inside the screening plate. A filter screen is arranged inside the material suction inlets. An annular discharging pipe is fixedly installed on the lower end face of the screening plate. A connecting pipe communicating the material suction channel and the annular discharging pipe is formed inside the screening plate. The lower end of the annular discharging pipe is fixedly installed with an L-shaped communicating pipe penetrating the outer ring wall of the casing.

[0020] Compared with the prior art, the present invention has the following beneficial effects: 1. The chromite ore powder grinding device adopts an integrated operation model of feeding, grinding and turning to complete the grinding operation of the chromite ore, ensuring that the gap between the grinding roller and the grinding disc is uniform while ensuring uniform material distribution and stable grinding force, thereby avoiding material accumulation, and secondly ensuring quantitative intermittent and uniform feeding of materials, while optimizing the timely discharge of fine powder through airflow control, ensuring uniform particle size, avoiding fine powder accumulation, significantly improving grinding efficiency and product quality, reducing equipment wear, and realizing efficient, stable and environmentally friendly grinding operations.

[0021] 2. During the grinding process, the chromite ore powder grinding device uses the lower triangular bracket to provide triangular stable support between the rotating grinding rollers, so as to effectively disperse and bear the radial and axial loads of the grinding rollers, reduce equipment vibration and deformation, and ensure that the gap between the grinding rollers and the grinding discs remains uniform, thereby improving grinding efficiency and product quality.

[0022] 3. The chromite ore powder grinding device adopts a two-stage feeding method. During the rotation of the grinding disc, quantitative intermittent feeding is performed between adjacent grinding rollers to avoid excessive accumulation of chromite ore on the grinding disc, ensure uniform distribution of materials, and improve grinding efficiency. At the same time, quantitative feeding can keep the amount of materials between the grinding roller and the grinding disc stable, avoid overload or insufficient grinding force, ensure uniform grinding particle size, improve product quality, and reduce equipment wear.

[0023] 4. The chromite ore powder grinding device forms a triangular table-type stable support structure through two upper and lower triangular stable supports, so that several grinding rollers are interconnected to form a highly stable grinding system. At the same time, the lower limit of the grinding roller is implemented in conjunction with the concentric grooves to offset the impact force on the equipment, suppress the vibration of the grinding roller during continuous high-intensity grinding and high-speed rotation, achieve automatic pressure balance, and further disperse and bear the load of the first-level discharge barrel and the second-level discharge barrel, ensuring quantitative and uniform material discharge, avoiding blockage or uneven discharge, reducing vibration and deformation, ensuring stable equipment operation, and improving grinding efficiency and product quality.

[0024] 5. The chromite ore powder grinding device turns the chromite ore being ground during the rotating grinding process of the grinding disc, and implements physical limitation by setting concentric grooves to guide the turning trajectory, so that the material is concentrated in the grinding area. At the same time, the chromite ore powder is instantly lifted by the top-down airflow and synchronously sucked out with negative pressure to ensure that the chromite ore powder that meets the standards is discharged in time, and then ensure the uniformity of the particle size of the ground chromite ore, improve product quality, and avoid the accumulation of fine powder affecting the grinding effect, significantly improving the grinding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0026] Figure 2 This is a partial cross-sectional view of the present invention.

[0027] Figure 3 This is the main cross-sectional view of the present invention.

[0028] Figure 4 This is a schematic three-dimensional structure diagram of the connection part and the load-bearing part of the present invention.

[0029] Figure 5 This is a schematic three-dimensional structure diagram of the load-bearing part and the blanking part of the present invention.

[0030] Figure 6 This is an exploded view of the blanking part of the present invention.

[0031] Figure 7 This is a schematic three-dimensional structure diagram of the cooperation between the rotating part and the grinding disc of the present invention.

[0032] Figure 8 is Figure 7 an enlarged schematic structure diagram of part A in

[0033] In the figure: 1. Machine shell; 11. Screening plate; 12. Grinding disc; 121. First motor; 13. Grinding machine box; 2. Grinding roller; 3. Lower triangular bracket; 4. Blanking mechanism; 41. Hydraulic driving part; 411. Support; 412. Hydraulic driving element; 42. Connection part; 421. Second motor; 422. Horizontal support rod; 423. Connection support rod; 43. Blanking part; 431. First-stage blanking cylinder; 432. Second-stage blanking cylinder; 433. Transfer cylinder; 434. Connection shaft; 44. Load-bearing part; 441. Upper triangular bracket; 442. Ring-shaped bracket; 443. Connecting rod; 51. Driving shaft; 52. Turning fan blade; 53. Rotating part; 531. Roller; 532. Conical support wheel; 533. Reinforcing connecting piece; 6. Discharging mechanism; 61. Air supply part; 611. Third motor; 612. Rotor blade; 62. Discharge part; 621. Material suction port; 622. Connecting pipe; 623. Ring-shaped discharge pipe. Detailed implementation manners

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0035] Please refer to Figure 1 , Figure 2 and Figure 3, A chromite powder grinding device, including a machine housing 1. At the lower end inside the machine housing 1, a screening plate 11 is fixedly installed. At the center of the screening plate 11, a grinding disc 12 is rotatably installed. A feeding mechanism 4 for feeding chromite is arranged inside the machine housing 1.

[0036] Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 , Along the circumferential direction of the outer ring wall of the machine housing 1, a number of grinding machine boxes 13 located above the screening plate 11 are evenly distributed. At one end where several grinding machine boxes 13 are close to each other, grinding rollers 2 are provided. Concentric grooves are formed on the grinding disc 12, and the concentric grooves are used to cooperate with the grinding rollers 2 to grind chromite and make the chromite concentrate in the grinding area. A lower triangular support 3 for providing triangular stable support for the grinding rollers 2 is jointly arranged among several grinding rollers 2.

[0037] Please refer to Figure 1 and Figure 2 , A hydraulic driving part 41 for adjusting the grinding pressure of the grinding rollers 2 is arranged on the grinding machine box 13, and a connecting part 42 connected to the screening plate 11 is also arranged on the grinding machine box 13.

[0038] Please refer to Figure 1 and Figure 2 , The feeding mechanism 4 includes a feeding part 43 arranged inside the machine housing 1 and rotating with the grinding disc 12 to intermittently feed between adjacent grinding rollers 2. A load-bearing part 44 for providing support for the feeding part 43 and the lower triangular support 3 is arranged inside the machine housing 1.

[0039] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 7 and Figure 8 , On the upper end surface of the screening plate 11, a driving shaft 51 located between adjacent grinding rollers 2 is rotatably installed through a bearing seat arranged. A turning fan blade 52 and a rotating part 53 are fixedly sleeved on the driving shaft 51. Through the rotating part 53, the driving shaft 51 rotates with the grinding disc 12 to turn the chromite during grinding. It should be noted that through the setting of the concentric grooves, physical limit is implemented to guide the turning trajectory, make the material concentrate in the grinding area, prevent the chromite from flying around when being turned by the turning fan blade 52, and at the same time, the concentric grooves can also implement lower limit for the grinding rollers 2, which is beneficial to improving the stability of the grinding rollers 2. In addition, the turning fan blade 52 and the grinding rollers 2 are alternately arranged in the circumferential direction of the grinding disc 12, and the function is to make the chromite gathered between the two grinding rollers 2 return to the position of the grinding rollers 2 through the turning action for repeated grinding.

[0040] Please refer to Figure 1 and Figure 2, a discharge mechanism 6 is further provided on the casing 1; the discharge mechanism 6 includes an air supply part 61 provided at the upper end of the casing 1 and a discharge part 62 at the lower end of the casing 1. The air supply part 61 provides an air flow from top to bottom in the casing 1 to lift the ground chromite powder, and the discharge part 62 sucks out the lifted chromite powder from the casing 1.

[0041] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 7 , the screening plate 11 is assembled by a plurality of sector plates. A first motor 121 with an output end fixedly connected to the grinding disc 12 is fixedly installed on the lower end face inside the casing 1. The grinding machine casing 13 and the grinding roller 2 are connected through bearings provided. At the center of the end face where the grinding rollers 2 are close to each other, a snap ring is installed through a bearing, and a connecting ring movably connected to the snap ring is fixedly installed on the lower triangular bracket 3; the hydraulic driving part 41 includes a support 411 fixedly installed on the outer ring wall at the lower end of the casing 1, and a hydraulic driving element 412 is jointly provided between the support 411 and the corresponding grinding machine casing 13.

[0042] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 7 , the connecting part 42 includes a connecting component provided on the upper end face of the screening plate 11. The connecting component is composed of two connecting support rods 423 symmetric about the corresponding grinding machine casing 13. A transverse support rod 422 fixedly penetrating the corresponding grinding machine casing 13 is rotatably installed between the two connecting support rods 423 in the same group; a second motor 421 with an output end fixedly connected to the corresponding grinding roller 2 is fixedly installed in the grinding machine casing 13 through a motor seat provided.

[0043] During specific operation, when grinding chromite, first start the first motor 121 to rotate the grinding disc 12 at the center of the screening plate 11, and then start the second motor 421 in the grinding machine casing 13 to drive the corresponding grinding roller 2 to rotate. During this process, the lower triangular bracket 3 provides triangular stable support for the rotating grinding roller 2, effectively dispersing and bearing the radial and axial loads of the grinding roller 2, and reducing equipment vibration and deformation.

[0044] During this process, the grinding machine casing 13 hinged on the casing 1 adjusts the distance between the grinding roller 2 and the grinding disc 12 under the cooperation of the hydraulic driving element 412 and the support 411, so as to adjust the pressure for grinding chromite, and the connecting support rods 423 on both sides stably support the grinding machine casing 13 on the screening plate 11.

[0045] Please refer to Figure 2 , Figure 3 ,Figure 4 , Figure 5 and Figure 6 , the blanking part 43 includes a primary blanking cylinder 431 fixedly installed inside the casing 1 through a set support rod. The upper end surface of the lower triangular bracket 3 is fixedly installed with a secondary blanking cylinder 432 coaxial with the primary blanking cylinder 431. At the center of the upper end surface of the grinding disc 12, a connecting shaft 434 is fixedly installed and rotatably penetrates through the center of the lower end surface of the secondary blanking cylinder 432. Inside the secondary blanking cylinder 432, a transfer cylinder 433 is rotatably installed through a bearing at the central axis, and the upper end of the transfer cylinder 433 is fixedly connected to the upper end of the connecting shaft 434. The upper end of the transfer cylinder 433 is connected to the lower end of the primary blanking cylinder 431 through a set bearing. The outer wall of the secondary blanking cylinder 432 is penetrated with blanking ports located between adjacent grinding rollers 2, and the outer wall of the transfer cylinder 433 is penetrated with blanking channels cooperating with the blanking ports. The center of the lower end surface inside the transfer cylinder 433 is conical, ensuring that the material will not accumulate at the bottom of the transfer cylinder 433 but can smoothly slide into the blanking port.

[0046] Please refer to Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 , the load-bearing part 44 includes an upper triangular bracket 441 fixedly installed inside the casing 1 and directly above the lower triangular bracket 3. Inside the upper triangular bracket 441, an annular bracket 442 is fixedly installed through a set support rod. The annular bracket 442 is coaxially fixed outside the primary blanking cylinder 431. At the midpoints of the three sides of the upper triangular bracket 441, connecting rods 443 fixedly connected to the lower triangular bracket 3 are fixedly installed.

[0047] During specific operation, when the grinding disc 12 and the grinding rollers 2 rotate, the chromite ore to be ground enters from the feed port provided on the casing 1. The entering chromite ore will slide along the inclined inner wall of the primary blanking cylinder 431, thereby slowing down the falling speed of the chromite ore and completing the primary blanking of the chromite ore. The rotation of the grinding disc 12 will cause the transfer cylinder 433 to rotate inside the secondary blanking cylinder 432 through the connecting shaft 434. At this time, the chromite ore falling in the primary blanking cylinder 431 will enter the transfer cylinder 433. When the blanking channel of the transfer cylinder 433 rotates to a certain blanking port on the secondary blanking cylinder 432, the chromite ore will quantitatively fall between the corresponding adjacent grinding rollers 2, thereby completing the secondary blanking of the chromite ore, realizing quantitative and intermittent blanking. By two-stage blanking, it is possible to avoid excessive accumulation of chromite ore on the grinding disc 12 and ensure uniform material distribution. Subsequently, under the cooperation of the rotation of the grinding disc 12 and the grinding rollers 2, the chromite ore is ground.

[0048] During the blanking process, the upper triangular bracket 441 and the annular bracket 442 provide support for the first-stage blanking cylinder 431, while the lower triangular bracket 3 provides support for the second-stage blanking cylinder 432 and the grinding roller 2. At the same time, the connecting rods 443 on the three sides will further provide a triangular prism-shaped stable support for the first-stage blanking cylinder 431 and the second-stage blanking cylinder 432, enabling several grinding rollers 2 to be interconnected to form a highly stable grinding system. Meanwhile, in cooperation with the concentric grooves for the lower limit of the grinding rollers 2, the impact force generated on the equipment is offset mutually, and the vibration of the grinding rollers 2 during continuous high-intensity grinding and high-speed rotation is suppressed, achieving automatic balance of pressure, avoiding single-point stress concentration and eccentric load wear. At the same time, it can also disperse and bear the loads of the first-stage blanking cylinder 431 and the second-stage blanking cylinder 432, ensuring quantitative and uniform blanking of materials. The formation of the highly stable grinding system, in turn, ensures the stability and effect of material turning and grinding.

[0049] It should be noted that due to the diameter and height limitations of the first-stage blanking cylinder 431, even if the feeding volume per unit time is large, the material will not be filled instantly, but will gradually slide into the transfer cylinder 433. It is also possible to automatically limit the blanking volume per unit time by controlling the rotation speed of the transfer cylinder 433 and the opening frequency of the blanking port to adapt to the feeding volume per unit time.

[0050] Please refer to Figure 2 、 Figure 3 、 Figure 7 and Figure 8 , the rotating part 53 includes rollers 531 fixedly sleeved on the outer wall of the driving shaft 51. Conical support wheels 532 are fixedly installed at the mutually close ends of the driving shafts 51. Both the conical support wheels 532 and the rollers 531 are in contact with the upper end surface of the grinding disc 12. Reinforcing connectors 533 corresponding to the driving shafts 51 one by one and used to ensure that both the conical support wheels 532 and the rollers 531 are in stable contact with the grinding disc 12 are fixedly installed on the screening plate 11; a number of weight-reducing holes are evenly distributed in an array on the material turning fan blades 52.

[0051] Please refer to Figure 1 、 Figure 2 and Figure 3 , the air supply part 61 includes a third motor 611 fixedly installed on the upper end surface of the machine shell 1. A rotor blade 612 located inside the machine shell 1 is fixedly sleeved on the output end of the third motor 611. The rotor blade 612 is located directly above the first-stage blanking cylinder 431.

[0052] Please refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 7 and Figure 8, the discharging section 62 includes a plurality of material suction inlets 621 formed on the upper end surface of the screening plate 11 and evenly distributed along its circumference. A material suction channel communicating with the plurality of material suction inlets 621 is formed in the screening plate 11. The screening plate 11 is arranged as an assembled structure to facilitate the opening of the material suction channel. A filter screen is arranged in the material suction inlet 621. An annular discharging pipe 623 is fixedly installed on the lower end surface of the screening plate 11. A connecting pipe 622 communicating the material suction channel and the annular discharging pipe 623 is formed in the screening plate 11. The lower end of the annular discharging pipe 623 is fixedly installed with an L-shaped communicating pipe penetrating the outer wall of the machine housing 1.

[0053] During specific operation, during the rotation of the grinding disc 12, the roller 531 and the conical support wheel 532 will stably contact the grinding disc 12 under the action of the strengthening connecting member 533. At the same time, the grinding disc 12 will cause the driving shaft 51 to rotate through the frictional force with the roller 531 and the conical support wheel 532, thereby driving the turning fan blade 52 to rotate to turn the massive or powdered chromite on the grinding disc 12, raising the chromite powder at the lower layer, and guiding the turning trajectory through the concentric grooves at the same time, so that the chromite is concentrated in the grinding area, which is beneficial to the full grinding of the chromite.

[0054] Meanwhile, start the third motor 611 to rotate its rotor blade 612, so as to provide an air flow from top to bottom in the machine housing 1 to blow the ground chromite powder towards the inner wall of the machine housing 1. The chromite powder meeting the particle size is blown towards the outside of the grinding disc 12, while the unqualified ones remain on the grinding disc 12. Subsequently, start an external air pump with its extraction end fixedly connected to the L-shaped communicating pipe, and make it carry out negative pressure material suction through the annular discharging pipe 623, the connecting pipe 622 and the plurality of material suction inlets 621 to suck out the blown chromite powder from the machine housing 1, thus completing the discharging of the chromite powder. It should be noted that the balance between the air flow and the material suction can be optimized by the rotation speed of the third motor 611 and the power of the air pump to ensure the discharging efficiency.

[0055] In summary, during the grinding process, while the grinding disc 12 rotates for grinding, it turns the chromite during the grinding process, raises the chromite powder through the air flow, and sucks out the chromite powder through the discharging section 62, thereby implementing air flow-negative pressure collaborative discharging, achieving the purpose of timely discharging the chromite powder meeting the standard, ensuring the uniformity of the particle size of the ground chromite, thus improving the product quality, and at the same time avoiding the influence of fine powder accumulation on the grinding effect, and significantly improving the grinding efficiency.

[0056] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A chromite ore powder grinding device, comprising a housing, characterized in that: A screening plate is fixedly installed at the lower end of the casing, a grinding disc is rotatably installed at the center of the screening plate, and a material discharge mechanism is arranged in the casing; Several grinding boxes located above the screening plate are evenly distributed on the outer ring wall of the casing. Grinding rollers are arranged at the ends of the grinding boxes close to each other. Concentric grooves are provided on the grinding discs. The concentric grooves are used to cooperate with the grinding rollers to grind the chromite and concentrate the chromite in the grinding area. A lower triangular bracket for providing triangular stable support is commonly provided between the grinding rollers. The material discharging mechanism comprises a material discharging part arranged in the housing and discharging materials intermittently between adjacent grinding rollers as the grinding disc rotates, and a load-bearing part providing support to the material discharging part and the lower triangular bracket; the load-bearing part and the lower triangular bracket form a triangular prism support structure, and the plurality of grinding rollers are constrained to each other through the triangular prism support structure; The upper end surface of the screening plate is provided with a driving shaft located between adjacent grinding rollers, and the driving shaft is provided with a turning blade and a rotating part. The turning blade is driven by the driving shaft to rotate through the rotating part to turn the chromite being ground, and at the same time, the turning track is guided by the concentric groove and the grinding roller is lowered. Discharging mechanism: The discharging mechanism includes an air supply part and a discharging part which are respectively arranged at the upper and lower ends of the casing. The air supply part provides airflow from top to bottom in the casing to instantly lift the ground chromite powder, and the discharging part sucks out the lifted chromite powder.

2. The chromite ore powder grinding device according to claim 1, characterized in that: The grinding machine box is connected to the grinding roller through a bearing, a clamping ring is installed at the center of one end surface of the grinding roller close to each other through the bearing, and a connecting ring movably connected to the clamping ring is fixedly installed on the lower triangular bracket.

3. The chromite ore powder grinding device according to claim 1, characterized in that: The grinding machine box is provided with a hydraulic drive unit for adjusting the grinding pressure of the grinding roller and a connection unit connected to the screening plate; the hydraulic drive unit includes a support fixedly mounted on the outer ring wall at the lower end of the casing, and a hydraulic drive element is provided between the support and the corresponding grinding machine box.

4. The chromite ore powder grinding device according to claim 3, characterized in that: The connecting part comprises a connecting assembly arranged on the upper surface of the screening plate, the connecting assembly is composed of two connecting support rods symmetrical with respect to the corresponding grinding machine box, and a transverse support rod fixedly penetrating the corresponding grinding machine box is installed between the two connecting support rods of the same group for common rotation; A second motor whose output end is fixedly connected to a corresponding grinding roller is fixedly installed in the grinding machine box through a motor seat.

5. The chromite ore powder grinding device according to claim 1, characterized in that: The unloading part includes a first-level unloading barrel fixedly installed inside the casing through a supporting rod, a second-level unloading barrel coaxial with the first-level unloading barrel is fixedly installed on the upper end surface of the lower triangular bracket, and an outer ring wall of the second-level unloading barrel is penetrated to open a unloading port located between adjacent grinding rollers.

6. The chromite ore powder grinding device according to claim 5, characterized in that: A connecting shaft is fixedly installed at the center of the upper end surface of the grinding disc and rotates through the center of the lower end surface of the secondary discharge barrel. A transfer barrel fixedly connected to the upper end of the connecting shaft is rotatably installed at the internal axis of the secondary discharge barrel through a bearing; the upper end of the transfer barrel is connected to the lower end of the first discharge barrel through a bearing, and a discharge channel that cooperates with the discharge port is penetrated by the outer ring wall of the transfer barrel, and the center of the lower end surface inside the transfer barrel is conical.

7. The chromite ore powder grinding device according to claim 5, characterized in that: The load-bearing part includes an upper triangular bracket fixedly installed in the casing and located directly above the lower triangular bracket. An annular bracket is fixedly installed inside the upper triangular bracket through a support rod. The annular bracket is coaxially fixed to the outside of the first-level unloading barrel. Connecting rods fixedly connected to the lower triangular bracket are fixedly installed at the midpoints of the three sides of the upper triangular bracket.

8. The chromite ore powder grinding device according to claim 1, characterized in that: The rotating part includes a roller fixedly mounted on the outer ring wall of the driving shaft, and a conical support wheel is fixedly installed at one end of the driving shaft close to each other, and the conical support wheel and the roller are in contact with the upper end surface of the grinding disk; a reinforcing connector corresponding to the driving shaft one by one and used to ensure that the conical support wheel and the roller are in stable contact with the grinding disk is fixedly installed on the screening plate.

9. The chromite ore powder grinding device according to claim 1, characterized in that: The air supply unit comprises a third motor fixedly mounted on the upper end surface of the casing, and an output end of the third motor is fixedly sleeved with a rotor blade located inside the casing and above the unloading mechanism.

10. The chromite ore powder grinding device according to claim 1, characterized in that: The discharging part comprises a plurality of material suction ports which are arranged on the upper end surface of the screening plate and are evenly distributed circumferentially; a suction channel which is connected with the plurality of material suction ports is arranged in the screening plate; a filter screen is arranged in the material suction port; an annular discharging pipe is fixedly installed on the lower end surface of the screening plate; a connecting pipe which connects the suction channel and the annular discharging pipe is arranged in the screening plate; an L-shaped connecting pipe which passes through the outer ring wall of the casing is fixedly installed at the lower end of the annular discharging pipe.

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