Ultra-precision Grinding Equipment and Grinding Method for Graphite Electrode Powder Materials

Abstract

The present invention provides an ultra-precision grinding device and a grinding method for graphite electrode powder materials, which relate to the field of graphite electrode raw material processing. It includes a barrel, which is divided into a material barrel and a supporting barrel. Among them, the supporting barrel is embedded in the material barrel, and a ring-shaped discharge area is formed by combining the supporting barrel with the bottom of the material barrel; extrusion blocks, a plurality of extrusion blocks are arranged in a circular array around the material barrel, and the plurality of extrusion blocks rotate towards or away from the supporting barrel with the side wall of the material barrel as the transfer point; sliders, a plurality of sliders corresponding to the extrusion blocks one by one are arranged in a circular array around the material barrel. Among them, the sliders block the rotation path of the extrusion blocks and slide along the height direction of the material barrel, so that the rotation of the extrusion blocks at the material barrel corresponds to the sliding of the sliders at the material barrel. The present invention uses a telescopic part to connect the first soft rod, so that the extrusion blocks and the grinding parts directly or indirectly combined with the first soft rod operate synchronously, thereby streamlining the production process, reducing the grinding waiting time, and better integrating into the production process.

Description

Technical Field

[0001] The present invention relates to the field of raw material processing of graphite electrodes, and particularly to an ultra-precise grinding device and a grinding method for graphite electrode powder materials. Background Art

[0002] Processing petroleum coke and pitch coke is an important part in the production of graphite electrodes. From the production process of graphite electrodes and the physical and chemical properties of petroleum coke and pitch coke, crushing and grinding petroleum coke or pitch coke is an essential processing step. For this purpose, shear crushing or extrusion crushing methods are used to introduce the crushing and grinding process. However, based on the feedback from personnel, the particle size of the powder subdivided by shear crushing is relatively large and the waste rate is high. Although the particle size of the powder subdivided by extrusion crushing meets the requirements of the production process, the problem of easy agglomeration at the extrusion part is difficult to effectively solve. In response to this, a ball mill is introduced to improve the above situation. However, the problem that follows is that the working mode of the ball mill determines that its feeding and discharging cannot be synchronized, and the grinding cycle is long. Embedded in the production process, it will slow down the entire production rhythm. Therefore, based on actual production, an ultra-precise grinding device with synchronous feeding / discharging of materials and high grinding efficiency is proposed. Summary of the Invention

[0003] The purpose of the present invention is to provide an ultra-precise grinding device and a grinding method for graphite electrode powder materials to solve the above technical problems.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve:

[0005] An ultra-precise grinding device for graphite electrode powder materials, including a barrel, which is divided into a material barrel and a support barrel. Among them, the support barrel is embedded in the material barrel, and a circular discharge area is formed at the bottom of the support barrel in combination with the material barrel;

[0006] Extrusion blocks, a plurality of extrusion blocks are arranged in a circular array around the material barrel, and the plurality of extrusion blocks rotate towards or away from the support barrel with the side wall of the material barrel as a transfer point;

[0007] Sliders, a plurality of sliders corresponding to the extrusion blocks one by one are arranged in a circular array around the material barrel. Among them, the sliders block the rotation path of the extrusion blocks and slide along the height direction of the material barrel, so that the rotation of the extrusion blocks at the material barrel corresponds to the sliding of the sliders at the material barrel;

[0008] Grinding assemblies, the grinding assemblies are arranged in a circular array at the bottom of the material barrel. Among them, one grinding assembly corresponds to one extrusion block, and the grinding assemblies communicate with the circular discharge area;

[0009] A telescopic part, the telescopic part is placed at the center of the material barrel. Among them, the movable part of the telescopic part extends outward from the bottom of the material barrel;

[0010] The first flexible rod penetrates through the grinding assembly, with both ends of the first flexible rod connected to the slider and the movable part of the telescopic part respectively. A spring for pulling the slider to slide upward is arranged along the sliding direction of the slider. When the movable part of the telescopic part reciprocates and expands and contracts, the extrusion block can strike the material synchronously with the grinding of the material by the grinding assembly.

[0011] Preferably, the grinding assembly includes a grinding member rotatably connected to the material barrel and a discharging part located between the material barrel and the grinding member for communicating the grinding member with the annular discharging area.

[0012] Preferably, the grinding member is a grinding part, which includes a grinding cylinder rotatably connected to the material barrel and a plurality of balls arrayed in the grinding cylinder. Among them, the balls are hung on the inner wall of the grinding cylinder by ropes and move inside the grinding cylinder when the grinding cylinder rotates.

[0013] Preferably, the grinding member is a grinding part ', which includes a grinding cylinder' rotatably connected to the material barrel. Among them, the grinding cylinder' has a pair of conical grinding cavities ', and a grinding rod' with a length greater than half of the height of the pair of conical grinding cavities'is inserted into the middle of the pair of conical grinding cavities '. And the upper end of the grinding rod' is connected to a second flexible rod' connected to the first flexible rod, so that when the first flexible rod slides inside the grinding cylinder ', the second flexible rod' can be pulled, and the grinding rod' can slide inside the pair of conical grinding cavities '.

[0014] Preferably, the pair of conical grinding cavities' includes two opposite conical cavities and a rod cavity connecting the two conical cavities, and the rod cavity is in sliding fit with the grinding rod '.

[0015] Preferably, a filter cup is installed at the discharging port of the grinding member. Among them, the cup mouth of the filter cup has a fine filter screen for sieving and removing powder.

[0016] Preferably, the discharging part includes a filter material head penetrating through the bottom of the material barrel and extending into the annular discharging area and a discharging pipe located between the filter material head and the grinding member for communicating the filter material head and the grinding member.

[0017] Preferably, a plurality of grooves are annularly arrayed around the barrel near the barrel. Among them, each groove corresponds to an extrusion block, and the groove is located in the rotation path of the extrusion block.

[0018] Preferably, the bottom of the groove is a slope with an angle.

[0019] The grinding method of the ultra-precision grinding equipment for graphite electrode powder material includes the following treatment steps:

[0020] 1) Reciprocally pull the first flexible rod through the telescopic part, combine the first flexible rod to pull the slider, and the spring to pull the slider back in the reverse direction, so that the extrusion block corresponding to the slider reciprocally rotates into the material barrel to cooperate with the barrel near the barrel to implement extrusion and crushing on the material;

[0021] 2) During the telescopic movement of the telescopic part, the change in height causes the first flexible rod passing through the grinding part to change its angle. Thus, during the reciprocating telescopic movement of the telescopic part, the first flexible rod on which the grinding part slides guides the grinding part to rotate reciprocally relative to the material barrel, and then grinds the crushed coarse material entering the grinding part. When the fineness reaches the standard, combined with the centrifugal force during rotation, the powder is separated from the grinding part and thrown outwards.

[0022] The beneficial effects of the present invention are as follows:

[0023] 1. The present invention uses a telescopic part to connect the first flexible rod, enabling the extrusion block and the grinding part directly or indirectly combined with the first flexible rod to operate synchronously, thereby streamlining the production process, reducing the grinding waiting time, and better integrating into the production process.

[0024] 2. The present invention improves the problem of powder caking that easily occurs during grinding, that is, by reciprocally driving the grinding part to rotate through the first flexible rod, the coarse material placed in the grinding part and the fine material after grinding are always in a moving state, thereby effectively suppressing the generation of the caking phenomenon.

[0025] 3. Different from a ball mill, the present invention has an open feeding end all the time. Thus, as long as there is feeding, after waiting for a while, there will be discharging, which is convenient for personnel to timely adjust the grinding amount or the grinding rate according to production requirements. Description of the Drawings

[0026] Figure 1 It is a schematic structural diagram of the ultra-precision grinding equipment for graphite electrode powder materials of the present invention;

[0027] Figure 2 is Figure 1 a three-dimensional structural diagram from a top-down perspective;

[0028] Figure 3 is Figure 1 a three-dimensional sectional view;

[0029] Figure 4 is Figure 3 a three-dimensional sectional view after removing the extrusion block;

[0030] Figure 5 is a schematic structural diagram of the grinding assembly in Embodiment 1;

[0031] Figure 6 is Figure 5 a three-dimensional sectional view of the shown grinding assembly;

[0032] Figure 7 is a schematic structural diagram of the ultra-precision grinding equipment for graphite electrode powder materials proposed in Embodiment 2;

[0033] Figure 8 is a schematic structural diagram of the grinding assembly in Embodiment 2;

[0034] Figure 9 is Figure 8 a three-dimensional sectional view of the grinding assembly shown;

[0035] Figure 10 is Figure 9 a three-dimensional sectional view of the grinding barrel and the grinding rod shown from another perspective;

[0036] Reference numerals: 1, telescopic part; 2, extrusion block; 3, material barrel; 4, slider; 5 / 5', grinding part; 51 / 51', grinding barrel; 52, ball; 52', grinding rod; 53', conical grinding cavity; 54', second soft rod; 6, pulling plate; 7, sleeve; 8, barrel support; 9, spring; 10, first soft rod; 11, chute; 12, filter head; 13, groove; 14, extrusion block moving groove; 15, discharge pipe; 16, filter cup; 17, first soft rod fixing pin. Detailed implementation manners

[0037] In order to make the technical means, creative features, achieved purposes and functions of the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments and drawings. However, the following embodiments are only the preferred embodiments of the present invention, not all of them. Based on the embodiments in the implementation manners, other embodiments obtained by those skilled in the art without creative efforts all fall within the protection scope of the present invention.

[0038] The specific embodiments of the present invention will be described below in conjunction with the drawings.

[0039] Embodiment 1

[0040] In this embodiment, a superfine grinding device for graphite electrode powder materials is proposed. The main body of the grinding device includes a material barrel 3 and a barrel support 8 placed in the material barrel 3. Please refer to Figures 2 - 4 , the barrel support 8 is a frustum with a cavity. Thus, materials including petroleum coke and pitch coke can slide along the slope to the bottom until the annular discharge area.

[0041] The material barrel 3 is a component for arranging multiple devices. Please refer to Figure 3 and Figure 4 , a plurality of extrusion block moving grooves 14 are annularly arranged on the side wall of the material barrel 3. Correspondingly, an extrusion block 2 is rotatably connected in each extrusion block moving groove 14, and the center of gravity of the extrusion block 2 faces downward. Thus, it can be foreseen that when the extrusion block 2 is pushed to rotate into the material barrel 3 along the rotation direction, the extrusion block 2 will surely approach or contact the barrel support 8. On the contrary, when the pushing force is eliminated, the extrusion block 2 will surely rotate in the opposite direction and move away from the barrel support 8 under the action of its own center of gravity.

[0042] In the above content, the rotation process of the extrusion block 2 is described. Among them, the key point of the rotation process is how to push. Please continue to refer toFigure 3 and Figure 4 At the outer sidewall of the material barrel 3, a sliding groove 11 is opened. Correspondingly, a sliding block 4 is installed at the sliding groove 11. For the sliding block 4, it blocks the rotation path of the extrusion block 2. Thus, when adjusting the relative position of the sliding block 4 at the sliding groove 11, the extrusion block 2 will have a corresponding rotation action. Here, an example is used for illustration:

[0043] Example ①: When the sliding block 4 slides from above the connection point of the extrusion block 2 to below it, when the sliding block 4 presses down, it presses the extrusion block 2, forcing the extrusion block 2 to rotate into the material barrel 3;

[0044] Example ②: When the sliding block 4 slides from below the connection point of the extrusion block 2 to above it, the sliding block 4 slowly releases the pushing force, so that the extrusion block 2 rotated into the material barrel 3 rotates outwards from the material barrel 3 (the center of gravity of the extrusion block 2 is low. Therefore, the extrusion block 2 does not really completely rotate out of the material barrel 3, but only part of the main body is located outside the material barrel 3).

[0045] The above content is to show how the grinding equipment extrudes and crushes solids such as petroleum coke and pitch coke. As follows, the grinding mechanism of this equipment is described:

[0046] Please refer to Figures 5 - 6 In this embodiment, a plurality of grinding parts 5 are annularly arranged at the bottom of the material barrel 3. Among them, one grinding part 5 corresponds to one extrusion block 2, and the grinding part 5 is combined with the discharging part to communicate with the annular discharging area.

[0047] Specifically, the grinding part 5 includes a grinding cylinder 51 rotatably connected to the material barrel 3 and a plurality of balls 52 arrayed in the grinding cylinder 51. Among them, the balls 52 are hung on the inner wall of the grinding cylinder 51 by ropes. In addition, a filter cup 16 is installed at the discharging port of the grinding cylinder 51 (the cup mouth of the filter cup 16 has a fine filter screen for screening and separating powders). Thus, it can be foreseen that after the crushed coarse materials enter the grinding cylinder 51 through the discharging part, by rotating the grinding cylinder 51 reciprocally, the balls 52 arrayed in the grinding cylinder 51 can strike the coarse materials during the movement to promote the refinement of the coarse materials. When the refinement standard is reached, combined with the centrifugal force during the rotation of the grinding cylinder 51, the powders are thrown out from the fine filter screen.

[0048] Please refer to Figures 1 - 6, during crushing and grinding, both the extrusion block 2 and the grinding part 5 need to be driven by torque. Therefore, at the key point, a telescopic part 1 is installed in the middle of the material barrel 3. Specifically, the telescopic part 1 is a telescopic component such as a cylinder or a hydraulic cylinder. It should be noted that the moving part of the telescopic part 1 extends outward from the bottom of the material barrel 3. In addition, the most important first soft rod 10 is also provided. Specifically, the first soft rod 10 penetrates through the grinding cylinder 51, and its two ends are respectively connected to the slider 4 and the moving part of the telescopic part 1. And a spring 9 for pulling the slider 4 to slide upward is arranged along the sliding direction of the slider 4. Thus, when the moving part of the telescopic part 1 reciprocates telescopically, the extrusion block 2 strikes the material synchronously with the grinding component grinding the material.

[0049] Combined Figures 1 - 6 Looking at it, after placing the material in the material barrel 3, only a small waiting time is required, and the abrasive part 5 will release fine powder. Thus, it is embedded in the production line to improve production efficiency.

[0050] Embodiment 2

[0051] In this embodiment, a superfine grinding equipment for graphite electrode powder materials is proposed. The main body of the grinding equipment includes a material barrel 3 and a barrel support 8 placed in the material barrel 3. Please refer to Figure 7 , the barrel support 8 is a frustum with a cavity. Thus, materials including petroleum coke and pitch coke can slide down the slope to the bottom, until the annular discharge area.

[0052] The material barrel 3 is a component for placing multiple devices. Please refer to Figure 7 , a plurality of extrusion block moving slots 14 are annularly arrayed on the side wall of the material barrel 3. Correspondingly, an extrusion block 2 is rotatably connected in each extrusion block moving slot 14, and the center of gravity of the extrusion block 2 is downward. Thus, it can be foreseen that when pushing the extrusion block 2 to rotate into the material barrel 3 along the rotation direction, the extrusion block 2 will surely approach the barrel support 8. On the contrary, when eliminating the pushing force, then under the action of its own center of gravity, the extrusion block 2 will surely rotate in the reverse direction and move away from the barrel support 8.

[0053] In the above content, the rotation process of the extrusion block 2 is described. Among them, the key point of the rotation process lies in how to push. Please continue to refer to Figure 3 and Figure 4 , we have opened a sliding slot 11 on the outer side wall of the material barrel 3. Correspondingly, a slider 4 is installed at the sliding slot 11. For the slider 4, it blocks the rotation path of the extrusion block 2. Thus, when adjusting the relative position of the slider 4 at the sliding slot 11, then the extrusion block 2 will have a corresponding rotation action. Here, an example is given:

[0054] Example ①, when the slider 4 slides from above the transfer point of the extrusion block 2 to below, the slider 4 presses down on the extrusion block 2, forcing the extrusion block 2 to rotate into the material barrel 3;

[0055] Example ②: When the slider 4 slides from below to above the transition of the extrusion block 2, the slider 4 slowly releases the pushing force, causing the extrusion block 2 screwed into the material barrel 3 to be screwed outwards from the material barrel 3 (since the center of gravity of the extrusion block 2 is low, the extrusion block 2 does not actually completely screw out of the material barrel 3, but only part of the main body is outside the material barrel 3).

[0056] Please refer to Figure 7 , a telescopic part 1 is installed in the middle of the material barrel 3. Specifically, the telescopic part 1 is a telescopic component such as a cylinder or a hydraulic cylinder. It should be noted that the movable part of the telescopic part 1 extends outwards from the bottom of the material barrel 3. In addition, a first soft rod 10 is provided. Specifically, the first soft rod 10 penetrates through the grinding cylinder 51', and the two ends are respectively connected to the slider 4 and the movable part of the telescopic part 1, and a spring 9 for pulling the slider 4 to slide upwards is arranged along the sliding direction of the slider 4.

[0057] Please refer to Figures 7 - 10 , different from Embodiment 1, in this embodiment, a plurality of grinding parts 5' are annularly arranged at the bottom of the material barrel 3. Among them, one grinding part 5' corresponds to one extrusion block 2, and the grinding part 5' combines a discharging part and an annular discharging area to communicate.

[0058] Specifically, please refer to Figures 8 - 10 , the grinding part 5' includes a grinding cylinder 51' rotatably connected to the material barrel 3. Among them, the grinding cylinder 51' has a pair of conical grinding cavities 53' (the pair of conical grinding cavities 53' includes two opposite conical cavities and a rod cavity connecting the two conical cavities, and the rod cavity is slidably matched with the grinding rod 52'). A grinding rod 52' with a length greater than half of the height of the pair of conical grinding cavities 53' is inserted into the middle of the pair of conical grinding cavities 53'. It should be noted that the upper end of the grinding rod 52' is connected to a second soft rod 54' connected to the first soft rod 10. When the first soft rod 10 slides in the grinding cylinder 51', the second soft rod 54' is pulled to make the grinding rod 52' slide in the pair of conical grinding cavities 53'.

[0059] Furthermore, in this embodiment, a filter cup 16 (the cup mouth of the filter cup 16 has a fine filter screen for sieving off powders) is also installed at the discharging port of the grinding cylinder 51'.

[0060] Similar to Embodiment 1, in this embodiment, the grinding cylinder 51' and the extrusion block 2 are connected based on the first flexible rod 10, and thus move synchronously under the drive of the telescopic part 1. Regarding the working mode of the grinding part 5', it is different from the grinding part 5 proposed in Embodiment 1. Specifically, the grinding rod 52' slides and frictions in the rod cavity under the traction of the first flexible rod 10, and the process of sliding friction is the process of grinding the coarse material entering the intermittent part between the grinding rod 52' and the rod cavity. In addition, during the rotation of the grinding cylinder 51', the end of the grinding rod 52' contacts the end of the grinding cylinder 51 and the filter cup 16, which are all continuations of the grinding process of the coarse material. Moreover, including the reciprocating rotation swing of the grinding cylinder 51', it can effectively prevent the powder from caking in the chamber.

[0061] In Embodiment 1 and Embodiment 2, a plurality of grooves 13 are annularly arranged around the barrel 8. Among them, each groove 13 corresponds to an extrusion block 2, and the groove 13 is located within the rotation path of the extrusion block 2. It should be noted that the bottom of the groove 13 is a sloped surface with an angle, which is composed of Figure 3 and 4 As shown, the extrusion block 2 is a sector. Considering that the contact area between the sector and the barrel 8 is limited (the extrusion area is small and the crushing effect is greatly reduced), by arranging grooves 13 corresponding to the extrusion blocks 2 one by one at the barrel 8, the contact area between the extrusion block 2 and the barrel 8 is increased to optimize the crushing efficiency. In addition, the bottom of the groove 13 is a slope, and the slope is set to enable the crushed material to quickly fall to the unloading part along the slope during the reverse rotation of the extrusion block 2, so as to promote the rapid grinding process of the crushed coarse material.

[0062] Regarding the unloading part, please refer to Figure 5 and Figure 8 , which includes a filter head 12 penetrating through the bottom of the material barrel 3 and extending into the annular unloading area and a discharge pipe 15 located between the filter head 12 and the grinding part for connecting the filter head 12 and the grinding part. It should be noted that the pores of the filter head 12 are larger than the fine filter screen of the filter cup 16, and the discharge pipe 15 is a flexible pipe.

[0063] In Embodiment 1 and Embodiment 2, in order to better fix the first flexible rod 10, a pulling plate 6 is installed at the end of the movable part of the telescopic part 1, and a plurality of first flexible rod fixing pins 17 connected to the first flexible rod 10 one by one are embedded in the pulling plate 6.

[0064] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only preferred examples of the present invention and do not limit the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. Superfine grinding equipment for graphite electrode powder materials, Characterized in that, Comprising: A barrel, which is divided into a material barrel and a support barrel. Among them, the support barrel is embedded in the material barrel, and a ring-shaped discharge area is formed by combining the support barrel and the material barrel at the bottom of the support barrel; Extrusion blocks, with multiple extrusion blocks arranged in a circular array around the material barrel. The center of gravity of the extrusion blocks is downward, and the multiple extrusion blocks rotate towards or away from the support barrel with the side wall of the material barrel as the transfer point; Sliders, with multiple sliders corresponding to the extrusion blocks one by one arranged in a circular array around the material barrel. Among them, the sliders block the rotation path of the extrusion blocks and slide along the height direction of the material barrel, so that the rotation of the extrusion blocks at the material barrel corresponds to the sliding of the sliders at the material barrel; Grinding components, with the grinding components arranged in a circular array at the bottom of the material barrel. Among them, one grinding component corresponds to one extrusion block, and the grinding components are communicated with the ring-shaped discharge area; A telescopic part, which is placed at the center of the material barrel. Among them, the movable part of the telescopic part extends outward from the bottom of the material barrel; A first soft rod, which penetrates through the grinding components, so that the two ends of the first soft rod are respectively connected to the slider and the movable part of the telescopic part, and a spring for pulling the slider to slide upward is arranged along the sliding direction of the slider. When the movable part of the telescopic part reciprocates and expands and contracts, the extrusion blocks strike the material synchronously with the grinding components grinding the material.

2. The superfine grinding equipment for graphite electrode powder materials according to claim 1, Characterized in that: The grinding component includes a grinding part rotatably connected to the material barrel and a discharge part located between the material barrel and the grinding part for communicating the grinding part with the ring-shaped discharge area.

3. The superfine grinding equipment for graphite electrode powder materials according to claim 2, Characterized in that: The grinding part is a grinding section, and the grinding section includes a grinding cylinder rotatably connected to the material barrel and a plurality of balls arranged in the grinding cylinder. Among them, the balls are hung on the inner wall of the grinding cylinder by ropes and move in the grinding cylinder when the grinding cylinder rotates.

4. The superfine grinding equipment for graphite electrode powder materials according to claim 2, Characterized in that: The grinding part is a grinding section, and the grinding section includes a grinding cylinder rotatably connected to the material barrel. Among them, the grinding cylinder has a conical grinding cavity, and a grinding rod with a length greater than half of the height of the conical grinding cavity is inserted into the middle of the conical grinding cavity, and the upper end of the grinding rod is connected to a second soft rod connected to the first soft rod, so that when the first soft rod slides in the grinding cylinder, the second soft rod is pulled to make the grinding rod slide in the conical grinding cavity.

5. The superfine grinding equipment for graphite electrode powder materials according to claim 4, Characterized in that: The conical grinding cavity includes two opposite conical cavities and a rod cavity connecting the two conical cavities, and the rod cavity is in sliding fit with the grinding rod.

6. The superfine grinding equipment for graphite electrode powder materials according to claim 2, Characterized in that: A filter cup is installed at the discharge port of the grinding part, and the cup mouth of the filter cup has a fine filter screen for screening off the powder.

7. The superfine grinding equipment for graphite electrode powder materials according to claim 2, Characterized in that: The discharge part includes a filter head penetrating through the bottom of the material barrel and extending into the ring-shaped discharge area and a discharge pipe located between the filter head and the grinding part for communicating the filter head and the grinding part.

8. The superfine grinding equipment for graphite electrode powder materials according to claim 1, Characterized in that: A plurality of grooves are annularly arrayed around the barrel, wherein each groove corresponds to an extrusion block, and the groove is located within the rotation path of the extrusion block.

9. The ultra-precision grinding equipment for graphite electrode powder materials according to claim 8, characterized in that: The bottom of the groove is a slope with an angle.

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