A vertical mill based on 4-pss parallel mechanism and use method

Abstract

A vertical mill based on 4-PSS parallel mechanism and a use method, comprising a vertical mill, a 4-PSS parallel mechanism is adopted inside the vertical mill, the 4-PSS parallel mechanism comprises a sliding block, the sliding block is installed in a sliding rail parallel to a Z axis inside a vertical mill wall and is connected with an upper end of a branch chain through a spherical pair, a lower end of the branch chain is connected with an upper platform through a spherical pair, the upper platform is parallel to an XOY plane and is installed in cooperation with a roller mill system; when the vertical mill works, collision force generated by contact between a mill roller and a raw material layer in a mill disc trough can be effectively absorbed by the 4-PSS parallel mechanism; the vertical mill has simple and compact structure, large rigidity, large bearing capacity, stronger sealing and good dynamic response performance.

Description

Technical Field

[0001] This invention belongs to the field of roller mill technology, specifically relating to a vertical mill based on a 4-PSS parallel mechanism and its usage method. Background Technology

[0002] A roller mill is a device used for grinding fine powders, commonly used in the grinding of powders and other products. The roller mill works by rotating a grinding disc, which drives the grinding rollers to rotate. The raw materials are pulverized by the compressive force generated by the contact between the grinding rollers and the grinding disc, and the shearing force generated by the sliding motion. During the grinding process, mechanical vibrations are unavoidable in roller mills. These unstable vibrations, especially when encountering large-particle materials or other impurities, can generate enormous impact forces, causing significant damage to the roller mill itself and greatly reducing grinding efficiency.

[0003] Compared to the previously widely used ball mills, vertical mills significantly reduce mechanical vibration and energy consumption, making them more energy-efficient and environmentally friendly. However, current vertical mills (publication number CN117085795A, titled "A Vertical Mill for the Production of Ultrafine Grinding Powder with Automatic Gap Compensation") use loading devices located outside the mill, resulting in a bulky structure, poor dynamic response, and poor sealing of the mill's internal cavity. The resulting mechanical vibration remains a major challenge that needs to be addressed. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the present invention aims to provide a vertical mill based on a 4-PSS parallel mechanism and its usage method, which has a simple and compact structure, high rigidity, high load-bearing capacity, stronger sealing performance, and good dynamic response performance.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A vertical mill based on a 4-PSS parallel mechanism is disclosed. The vertical mill internally adopts a 4-PSS parallel mechanism, which includes a slider. The slider is installed in a slide rail parallel to the Z-axis on the inner side of the vertical mill wall and is connected to the upper end of the support chain through a spherical pair. The lower end of the support chain is connected to the upper platform through a spherical pair. The upper platform is parallel to the XOY plane and is installed in conjunction with a roller mill system.

[0007] A feed inlet is set directly above the vertical mill. The feed inlet is fixed to the inside of the upper cover. The lower end of the upper cover is connected to the upper end of the vertical mill wall. The feed inlet is connected to the discharge pipe below.

[0008] The roller mill system includes a grinding roller arranged in a ring and installed on the upper platform through a central hole. The surface of the grinding roller is in close contact with the material groove surface at the edge of the grinding disc. The grinding disc is connected to the lower cone. A main reduction gearbox is provided at the lower part of the grinding disc. The lower end of the main reduction gearbox is fixed to the foundation, and the upper end of the main reduction gearbox is fixed to the lower cone. The lower cone and the bottom of the grinding disc are connected by a second rib. A support structure is provided on the outside of the main reduction gearbox.

[0009] The support structure includes a working platform connected to the lower end of the vertical mill wall, the lower end of the working platform being connected to the main support body, and the lower end of the main support body being fixed to the foundation.

[0010] The working surface of the grinding roller and the material groove surface at the edge of the grinding disc constitute the grinding area. The material groove surface at the edge of the grinding disc is slightly wider than the working surface of the grinding roller, and the grinding roller is installed perpendicular to the flat surface of the working platform.

[0011] The vertical mill wall is a fully enclosed structure, with its lower end fixed to the surface of the working platform via a first rib.

[0012] A method for using a vertical mill based on a 4-PSS parallel mechanism includes the following steps:

[0013] Step 1: Pour the raw material to be crushed into the center of the grinding disc through the feed inlet;

[0014] Step 2: The motor drives the grinding disc to rotate through the main gearbox, and the centrifugal force generated by the rotation of the grinding disc is used to feed the raw material into the material trough on the edge of the grinding disc;

[0015] Step 3: The 4-PSS parallel mechanism causes the upper platform to rotate around the Z-axis, and the grinding rollers also follow the upper platform to roll in the trough; the raw material is crushed into powder under the combined action of extrusion and shearing forces.

[0016] Step 4: The powder that has been pulverized into a qualified product is carried out of the vertical mill by the hot airflow, while the powder that has not been pulverized into a qualified product continues to fall back onto the grinding disc for further pulverization until it becomes a qualified product.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] 1. This invention employs a 4-PSS parallel mechanism connected to the grinding roller. During vertical mill operation, the impact force generated by the contact between the grinding roller and the raw material layer in the grinding disc feed trough can be effectively absorbed by the 4-PSS parallel mechanism. Especially when encountering large-particle-size raw materials or other foreign impurities, due to the excellent dynamic performance of the 4-PSS parallel mechanism, the huge impact force generated is absorbed by the four branches through the Z-axis movement of the sliders; whereas in traditional mills, only one roller mill system can absorb the impact, causing significant damage to mechanical components and even breakage. Because the two ends of the branches in this invention are connected by spherical pairs, and the four sliders move independently, the upper platform can rotate around the Z-axis, and the grinding roller also rolls within the feed trough following the upper platform. This increases the compression area, making the compression force on the raw material layer in the feed trough more uniform, and reducing the likelihood of localized areas of excessively thin or thick material layers, thereby reducing vibration.

[0019] 2. Compared to traditional roller mills, all vertical mill components of this invention are located within the vertical mill cavity, and the mill wall has a fully enclosed structure, providing better sealing and facilitating the drying and grinding of raw materials. Furthermore, the 4-PSS parallel mechanism is simple and compact, with high rigidity and load-bearing capacity, making it less prone to mechanical fatigue damage. This results in higher working efficiency, lower energy consumption, and better environmental performance. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall invention.

[0021] Figure 2 This is a schematic cross-sectional view of the entire invention.

[0022] Figure 3 This is a schematic diagram of the 4-PSS parallel structure of the present invention.

[0023] In the diagram, 1-working platform, 2-vertical mill wall, 3-main support body, 4-foundation, 5-upper platform, 6-upper end cover, 7-feed inlet, 8-slider, 9-branch chain, 10-slide rail, 11-grinding roller, 12-spherical pair, 13-grinding disc, 14-main gearbox, 15-feeding pipe, 16-first rib, 17-second rib, 18-lower cone, 19-upper panel. Detailed Implementation

[0024] The present invention will now be described in more detail with reference to the embodiments and accompanying drawings.

[0025] like Figure 1 , Figure 2As shown, a vertical mill based on a 4-PSS parallel mechanism includes a vertical mill wall 2, an upper end cover 6 connected to the upper end of the vertical mill wall 2, a feed inlet 7 connected to the inner side of the upper end cover 6, and a discharge pipe 15 connected below the feed inlet 7; a working platform 1 is provided at the lower end of the vertical mill wall 2 and is fixedly connected to the outer wall of the vertical mill wall 2 through a first rib 16; the lower end of the working platform 1 is connected to the upper end of the main support body 3, the lower end of the main support body 3 is fixedly connected to the foundation 4, and a main reduction gearbox 14 is provided inside the main support body 3.

[0026] like Figure 2 , Figure 3 As shown, the vertical mill adopts a 4-PSS parallel mechanism. The 4-PSS parallel mechanism includes a slider 8, which is set in a slide rail 10 parallel to the Z-axis on the inner side of the vertical mill wall 2 and connected to the upper end of the support chain 9 through a spherical joint 12. The lower end of the support chain 9 is connected to the upper platform 5 through the spherical joint 12. The upper platform 5 is parallel to the XOY plane and is installed in conjunction with the grinding roller system.

[0027] The upper platform 5 has through holes arranged in a ring on its surface for mounting the grinding roller 11.

[0028] like Figure 2 As shown, the roller mill system includes a grinding roller 11, which is arranged in a ring and installed on the upper platform 5 through a central hole. The surface of the grinding roller 11 is in close contact with the edge of the grinding disc 13. The grinding disc 13 is connected to the lower cone 18. The center of the grinding disc 13 is provided with an upper panel 19. The lower part of the grinding disc 13 is provided with a main reduction gearbox 14. The lower end of the main reduction gearbox 14 is fixed to the foundation 4, and the upper end of the main reduction gearbox 14 is fixed to the lower cone 18. The lower cone 18 and the bottom of the grinding disc 13 are connected by a second rib 17.

[0029] A method for using a vertical mill based on a 4-PSS parallel mechanism includes the following steps:

[0030] Step 1: Pour the raw material to be crushed into the feed port 7 and enter the upper panel 19 at the center of the grinding disc 13 through the feed pipe 15;

[0031] Step 2: The motor drives the grinding disc 13 to rotate through the main reduction gearbox 14, and the centrifugal force generated by the rotation of the grinding disc 13 is used to feed the raw material into the material trough on the edge of the grinding disc 13.

[0032] Step 3: Due to the friction between the grinding roller 11 and the raw material layer, the grinding roller 11 rolls. Sometimes, it may slide between the grinding roller 11 and the raw material layer. Since both ends of the 4-PSS parallel mechanism branch chain 9 are connected by spherical pairs 12, and the four sliders 8 move independently, the upper platform 5 can rotate around the Z-axis. The grinding roller 11 also rolls in the material trough along with the upper platform 5. The extrusion area becomes larger, and the extrusion pressure on the raw material layer in the material trough is more uniform, making it less likely for the material layer to be too thin or too thick in some areas. Under the combined action of extrusion pressure and shearing force, the raw material is gradually crushed into powder.

[0033] Step 4: The powder that has been pulverized into a qualified product is carried out of the vertical mill by the hot airflow and enters the next step of the process, while the powder that has not been pulverized into a qualified product continues to fall back to the grinding disc 13 for further pulverization. After several cycles, it becomes a qualified product.

[0034] This invention discloses a vertical mill based on a 4-PSS parallel mechanism. The 4-PSS parallel mechanism is connected to the grinding roller system. During operation, the impact force generated by the contact between the grinding roller 11 and the raw material layer in the grinding disc 13 feed trough can be effectively absorbed by the 4-PSS parallel mechanism. Especially when encountering large-particle-size raw materials or other foreign impurities, the excellent dynamic performance of the 4-PSS parallel mechanism allows the enormous impact force to be distributed and absorbed by the four branches 9 through the Z-axis movement of the sliders 8. In contrast, traditional mills can only absorb the impact force through a single roller system, causing significant damage to mechanical components and even breakage. Because the branches 9 in this invention are connected at both ends by spherical pairs 12, and the four sliders 8 move independently, the upper platform 5 can rotate around the Z-axis. The grinding roller 11 also rolls within the feed trough following the upper platform 5, increasing the compression area and making the compression force on the raw material layer more uniform. This reduces the likelihood of excessively thin or thick local areas of the material layer, thereby reducing vibration. Compared to traditional roller mills, all components of the vertical mill are located inside the mill cavity, providing better sealing and facilitating the drying and grinding of raw materials. Furthermore, the 4-PSS parallel mechanism is simple and compact, with high rigidity and load-bearing capacity, making it less prone to mechanical fatigue damage, resulting in higher working efficiency, lower energy consumption, and better environmental performance.

Claims

1. A vertical mill based on a 4-PSS parallel mechanism, characterized in that: The vertical mill uses a 4-PSS parallel mechanism. The 4-PSS parallel mechanism includes a slider, which is installed in a slide rail parallel to the Z-axis on the inner side of the vertical mill wall and connected to the upper end of the support chain through a spherical pair. The lower end of the support chain is connected to the upper platform through a spherical pair. The upper platform is parallel to the XOY plane and is installed in conjunction with the roller mill system. The roller mill system includes a grinding roller arranged in a ring and installed on the upper platform through a central hole. The surface of the grinding roller is in close contact with the material groove surface at the edge of the grinding disc. The grinding disc is connected to the lower cone. A main reduction gearbox is provided at the lower part of the grinding disc. The lower end of the main reduction gearbox is fixed to the foundation, and the upper end of the main reduction gearbox is fixed to the lower cone. The lower cone and the bottom of the grinding disc are connected by a second rib. A support structure is provided on the outside of the main reduction gearbox.

2. The vertical mill according to claim 1, characterized in that: A feed inlet is set directly above the vertical mill. The feed inlet is fixed to the inside of the upper cover. The lower end of the upper cover is connected to the upper end of the vertical mill wall. The feed inlet is connected to the discharge pipe below.

3. The vertical mill according to claim 1, characterized in that: The support structure includes a working platform connected to the lower end of the vertical mill wall, the lower end of the working platform being connected to the main support body, and the lower end of the main support body being fixed to the foundation.

4. The vertical mill according to claim 1, characterized in that: The working surface of the grinding roller and the material groove surface at the edge of the grinding disc constitute the grinding area. The material groove surface at the edge of the grinding disc is slightly wider than the working surface of the grinding roller, and the grinding roller is installed perpendicular to the flat surface of the working platform.

5. The vertical mill according to claim 1, characterized in that: The vertical mill wall is a fully enclosed structure, with its lower end fixed to the surface of the working platform via a first rib.

6. A method of using a vertical mill based on a 4-PSS parallel mechanism as described in any one of claims 1-5, characterized in that, Includes the following steps: Step 1: Pour the raw material to be crushed into the center of the grinding disc through the feed inlet; Step 2: The motor drives the grinding disc to rotate through the main gearbox, and the centrifugal force generated by the rotation of the grinding disc is used to feed the raw material into the material trough on the edge of the grinding disc; Step 3: The 4-PSS parallel mechanism causes the upper platform to rotate around the Z-axis, and the grinding rollers also follow the upper platform to roll in the trough; the raw material is crushed into powder under the combined action of extrusion and shearing forces. Step 4: The powder that has been pulverized into a qualified product is carried out of the vertical mill by the hot airflow, while the powder that has not been pulverized into a qualified product continues to fall back onto the grinding disc for further pulverization until it becomes a qualified product.

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