High temperature roller compactor

Abstract

The application relates to the field of roll balling machines, and discloses a high-temperature roll balling machine, which comprises a rack, a pair of roll shafts, a cooling system and a feeding device, the pair of roll shafts comprises a pair of forming rolls, the forming rolls are internally provided with internal cooling water channels, the roll skins of the forming rolls are made of high-temperature alloy, the surfaces of the roll skins are processed with mold cavities in the shapes of hemispheres, half-spheres or flat shapes, the roll shafts are internally drilled with cooling water channels and a plurality of axial internal cooling channels of the roll skins, the bearing units adopt high-temperature bearings, and the cooling system is externally connected with circulating oil. The high-temperature roll balling machine is adopted to realize high-temperature precision control in the whole process: through independent and active cooling of the feeding bin and the roll body, it is ensured that the whole process from material conveying, feeding to pressing and forming is carried out in the preset high-temperature environment, the formability of high-temperature materials and the pellet quality are obviously improved, and the high-temperature materials have high density, low porosity and few cracks.

Description

Technical Field

[0001] This invention relates to the field of roller forming machines, specifically a high-temperature roller forming machine. Background Technology

[0002] A roller pelletizing machine is a device that uses one or more pairs of rollers to press powder or granular materials under high pressure, shaping them into regular spheres or ellipsoids. It is widely used in metallurgy, chemical industry, mining, environmental protection and other industries to prepare metal powder pellets, catalyst carriers, ferroalloy raw materials, desulfurizing agents, etc.

[0003] Existing roller briquetting machines are generally suitable for materials at room temperature or medium to low temperatures. When processing certain special materials (such as certain metal or alloy powders, special ceramic precursors, high-temperature reactive materials, etc.), it is necessary for the material to maintain good plasticity at a specific high temperature (usually 500℃ ~ 1000℃) and be pressed into shape to prevent the material from cooling hardening, oxidation, or undergoing unfavorable phase transformation, thereby obtaining high-density, high-strength, and highly reactive spherical or granular products. Traditional roller briquetting machines have the following shortcomings: Lack of an effective high-temperature protection system: The main body of the equipment is prone to thermal deformation when working in a high-temperature environment for a long time, which affects the accuracy of the roll gap and the quality of the ball forming; key components such as roll skin, bearings, and seals cannot withstand high temperatures, have short lifespans, and are prone to failure.

[0004] Unstable feeding method: The high-temperature material from the rotary kiln or electric furnace is not always uniform during the process of being conveyed to the rolling mill pressing area. This results in inconsistent amounts of material flowing into the briquetting chamber, poor briquetting efficiency, and excessive powder, leading to high dust levels and a poor environment on site.

[0005] Therefore, there is an urgent need for a high-temperature roller pelletizing machine that can accurately measure material throughout the entire process, adapt to high-temperature conditions, and operate stably and reliably. Summary of the Invention

[0006] The purpose of this invention is to provide a high-temperature roller pelletizing machine to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A high-temperature roller pressing pelletizing machine includes a frame, a roller shaft system, a cooling system, and a feeding device, characterized in that: The roller shaft system includes a pair of forming rollers. The forming rollers are provided with internal cooling water channels. The roller skin of the forming rollers is made of high-temperature alloy and the surface is machined with mold cavities of hemispherical, semi-spherical, or flat shapes. The roller shaft is drilled with cooling water channels and several axial internal cooling channels on the roller skin. The bearing unit adopts high-temperature bearings and is connected to an external circulating oil cooling system. The feeding device includes a feeding bin with a pre-compression device. The feeding device has a jacket structure and uses a hydraulic motor to drive a spiral shaft to pre-compress the incoming material. The equipment is equipped with an insulation cover and a maintenance platform. The control system controls the drive motor to drive a single-inlet, same-side, double-outlet reducer, which drives the forming rollers to rotate through a drum-shaped gear coupling. High-temperature alloy powder from the hot rotary furnace is continuously fed into the feeding bin of the feeding device and falls between the opposing rotating forming rollers. Under high pressure, it is formed into high-density pellets in the mold cavity, thus achieving the pressing into balls.

[0008] The frame is a welded frame, and thermal expansion guide grooves are provided at the connection between the key crossbeam and the bearing seat. The cooling system and temperature control system include a roll heating unit for heating the roll shaft system, a feed bin for metering, a temperature sensor, and a central control system; the roll cooling unit is connected to the internal cooling channel through a rotary joint; the central control system independently controls the roll cooling unit and the feed bin cooling unit according to the feedback signal from the temperature sensor.

[0009] Preferably, the forming roll also has an internal cooling channel that is independent of the internal cooling channel.

[0010] Preferably, the bearing unit of the roll system is connected to an independent bearing cooling circulation pipeline.

[0011] Preferably, the frame is provided with a thermal compensation structure, which is a thermal expansion guide groove or a flexible support component.

[0012] Preferably, the feeding bin is a jacketed structure with a heat insulation layer and built-in cooling elements.

[0013] Preferably, the high-temperature roller pelletizing machine is also equipped with a heat insulation system, which includes a removable heat insulation cover covering the non-working area of ​​the forming roller and the outside of the feeding bin, as well as a heat insulation protection plate set on the periphery of the equipment.

[0014] Preferably, the roller skin of the roller is in various granulation shapes such as hemispherical, semi-spherical, or flat.

[0015] Compared with the prior art, the present invention has the following beneficial effects: This invention achieves high-temperature precision control throughout the entire process: by independently and actively cooling the feeding bin and the roller body, it ensures that the entire process from material conveying and feeding to pressing and molding is carried out in a preset high-temperature environment, which significantly improves the formability of high-temperature materials and the quality of pellets (high density, low porosity, and fewer cracks). The equipment boasts excellent thermal stability and a long service life. The frame's thermal compensation structure counteracts the effects of thermal deformation. Uniform and efficient internal heating of the rolls reduces localized thermal stress. Independent cooling systems for key bearings ensure reliable operation and long service life in high-temperature environments. The thermal insulation system minimizes heat loss and environmental impact. It is highly adaptable to various processes, energy-efficient, and suitable for molding different materials within a wide temperature range from 500℃ to 1000℃. Compared to reciprocating extrusion pelletizing, it offers higher production efficiency, lower energy consumption, higher density of the formed billets, and a better environmental impact. Integrated cooling channels facilitate maintenance. Its high degree of automation, coupled with a central DCS system, makes it easy to operate and suitable for continuous industrial production. Attached Figure Description

[0016] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a front view of the high-temperature roller pelletizing machine of the present invention; Figure 2 This is a top view of the high-temperature roller pressing pelletizing machine of the present invention; Figure 3 This is a side view of the high-temperature roller pelletizing machine of the present invention; Figure 4 This is a structural diagram of the roller shaft system of the high-temperature roller pressing ball forming machine of the present invention; In the diagram: 1-frame, 2-roller shaft system, 3-bearing unit, 4-cooling system, 5-feeding device, 6-hydraulic motor, 7-protective cover, 8-maintenance platform, 9-drive motor, 10-single-inlet same-side double-outlet reducer, 11-drum-shaped gear coupling, 21-formed mold cavity, 22-internal cooling water channel. Detailed Implementation

[0017] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention. It should also be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings. In the embodiments of the present invention, the different types of cross-sectional lines are not labeled according to national standards, nor do they specify material requirements for the components; they are used to distinguish the cross-sectional views of the components.

[0018] Please see Figure 1-4 A high-temperature roller pelletizing machine includes a frame 1, a roller shaft system 2, a cooling system 4, and a feeding device 5. The roller shaft system 2 includes a pair of forming rollers. The forming rollers are provided with internal cooling water channels 22. The roller skin of the forming rollers is made of high temperature alloy and the surface is machined with mold cavities 21 in the shape of hemispherical, semi-spherical, or flat. The roller shaft is drilled with cooling water channels 22 and several axial internal cooling channels on the roller skin. The bearing unit 3 adopts high temperature bearings and is connected to an external circulating oil cooling system 4. The feeding device 5 includes a feeding bin with a pre-compression device. The feeding device 5 has a jacket structure and is driven by a hydraulic motor 6 to pre-compress the incoming material. The equipment is equipped with an insulation cover 7 and a maintenance platform 8. The control system controls the drive motor 9 to drive a single-inlet, same-side, double-outlet reducer 10, which drives the forming rollers to rotate through a drum-shaped gear coupling 11. High-temperature alloy powder from the hot rotary furnace is continuously fed into the feeding bin of the feeding device 5 and falls between the opposing rotating forming rollers. Under high pressure, it is formed into high-density pellets in the mold cavity 21, thus achieving the pressing into pellets.

[0019] The frame 1 is a welded frame, and a thermal expansion guide groove is provided at the connection between the key crossbeam and the bearing seat. The cooling system 4 and temperature control system include a roll heating unit for heating the roll shaft system 2, a feed bin for metering, a temperature sensor, and a central control system; the roll cooling unit is connected to the internal cooling channel through a rotary joint; the central control system independently controls the roll cooling unit and the feed bin cooling unit according to the feedback signal from the temperature sensor.

[0020] The forming roll also has an internal cooling channel that is independent of the internal cooling channel.

[0021] The bearing unit of the rolling mill system is connected to an independent bearing cooling circulation pipeline.

[0022] The frame 1 is equipped with a thermal compensation structure, which is a thermal expansion guide groove or a flexible support component.

[0023] The feeding hopper is a jacketed structure with a heat insulation layer and built-in cooling elements.

[0024] The high-temperature roller pelletizing machine is also equipped with a heat insulation system, which includes a detachable heat insulation cover that wraps around the non-working area of ​​the forming roller and the outside of the feeding bin, as well as a heat insulation protection plate set around the equipment.

[0025] The roll skin of the rolling mill has various granulation shapes, such as hemispherical, semi-spherical, and flat.

[0026] The working principle and usage process of this invention include: frame 1, drive system, roller shaft system 2, feeding device 5, cooling system 4, and heat insulation system.

[0027] The frame 1 is made of high-strength heat-resistant steel and is equipped with a thermal compensation structure to resist thermal expansion.

[0028] The roller system 2 includes a pair of parallel, rotatable forming rollers. Each forming roller has hemispherical or specifically shaped forming cavities evenly distributed along its circumferential and axial directions on its roller surface. Internal cooling water channels are arranged axially and / or circumferentially inside the roller skin, and cooling water pipes are also provided inside the roller shaft. The bearing unit 3 of the roller system 2 uses high-temperature resistant bearings, and the bearing housing is connected to an independent bearing cooling circulation pipeline. The roller skin is made of a high-temperature alloy material with a temperature resistance of 500-1000℃ to meet the requirements of the working conditions.

[0029] The feeding device 5 includes a feeding bin located above the forming rollers and aligned with the gap between them. The feeding bin has a jacketed structure with an insulation layer and built-in cooling elements to ensure that the material subjected to high temperatures does not deform. The feeding system includes material level detection and weighing for centralized control.

[0030] The cooling system 4 is the core component, and includes: The roller cooling system: Cooling water is introduced into the cooling channels inside the forming roller shaft via a rotary joint. Simultaneously, the water flows back into the roller shaft through the cooling channels of the roller skin that wraps around the main shaft. After heat exchange, the hot water flows out through the rotary joint, thereby reducing the temperature of the roller shaft and roller skin. Additionally, cooling channels are also provided inside the bearing housing to cool the heat transferred to the bearing through heat transfer and radiation, thus protecting the bearing. Drive system: A drive motor 9 is used, which drives a single-input, same-side, double-output reducer 10 through a drum-shaped gear coupling 11. The two output shafts are connected to the two main shafts of the ball forming machine through the drum-shaped gear coupling 11, thereby driving the main shafts to rotate in opposite directions.

[0031] The pressurization system consists of three main parts: a hydraulic power unit, a buffer device, and a hydraulic cylinder. The buffer device and the hydraulic cylinder are directly mounted on the main frame, resulting in a compact structure. The hydraulic power unit comprises an oil pump, an oil pump motor, a filter, and a valve platform. The valve platform consists of a relief valve, a solenoid directional valve, a check valve, a pressure gauge, a solenoid hydraulic relief valve, and a pressure sensor. The buffer device consists of an accumulator, a check valve, a shut-off valve, and a base. The main hydraulic cylinder consists of a cylinder body, a piston sleeve, a support sleeve, bearings, seals, and dust seals.

[0032] The thermal insulation system includes: a removable high-temperature insulation cover that wraps around the non-working area of ​​the forming rolls and the outside of the feeding hopper; and thermal insulation panels installed around the entire equipment to reduce heat radiation in the workshop.

[0033] The working principle of this invention is as follows: The frame 1 adopts a welded frame, and a thermal expansion guide groove is provided at the connection between the key crossbeam and the bearing seat. A pair of forming roller shafts 2, the roller skin is made of high-temperature alloy, and the surface is machined with mold cavities 21 of hemispherical, semi-spherical, or flat shapes, etc. The roller shaft is drilled with cooling water channels 22 and several axial internal cooling channels 23 on the roller skin. The bearing unit 3 adopts high-temperature bearings and is connected to an external circulating oil cooling pipe 4. The feeding bin 5 is a jacket structure, and the incoming material is pre-pressed by a hydraulic motor 6 driving the screw shaft. The equipment is equipped with an insulation cover 7 and a maintenance platform 8. During operation, the control system controls the drive motor 9 to drive the single-in-double-out reducer 10, which drives the rollers to rotate through the drum-shaped gear coupling 11. The high-temperature alloy powder from the hot rotary furnace is continuously fed into the feeding bin 5 and falls between the opposing rotating forming rollers 2. Under high pressure, it is formed into high-density pellets in the mold cavity 21, successfully realizing the continuous, stable, and high-quality pressing of high-temperature materials into pellets; High-temperature materials (such as preheated metal powder) are continuously fed into a feed hopper equipped with a pre-compression device. A pair of forming rollers rotate in opposite directions under the drive system. When the material is squeezed from the bottom of the feed hopper into the gap between the rotating rollers, it is forced into the corresponding forming cavity under precisely controlled pressure, where it is subjected to high-pressure roller compression to form dense spheres. The formed high-temperature spheres automatically detach as the rollers rotate. Throughout the entire process, the material temperature, roller temperature, cylinder pressure, and even the bearing operating temperature are under real-time monitoring and closed-loop control to ensure that forming is completed in the optimal thermoplastic state.

[0034] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0035] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A high-temperature roller pressing pelletizing machine, characterized in that: The machine includes a frame (1), a roller system (2), a cooling system (4), and a feeding device (5), characterized in that: The roller shaft system (2) includes a pair of forming rollers. The forming rollers are provided with internal cooling water channels (22). The roller skin of the forming rollers is made of high temperature alloy and the surface is machined with mold cavities (21) of hemispherical, semi-spherical, or flat shapes. The roller shaft is drilled with cooling water channels (22) and several axial internal cooling channels on the roller skin. The bearing unit (3) adopts high temperature bearings and is connected to an external circulating oil cooling system (4). The feeding device (5) includes a feeding bin, which is equipped with a pre-compression device. The feeding device (5) is a jacket structure. The spiral shaft is driven by a hydraulic motor (6) to pre-compress the incoming material. The equipment is equipped with an insulation cover (7) and a maintenance platform (8). The control system controls the drive motor (9) to drive the single-inlet, same-side, double-outlet reducer (10). The forming rollers are rotated through the drum-shaped gear coupling (11). The high-temperature alloy powder from the hot rotary furnace is continuously fed into the feeding bin of the feeding device (5) and falls between the forming rollers rotating in opposite directions. Under high pressure, it is formed into a high-density pellet in the mold cavity (21) to achieve the pressing into a ball. The frame (1) is a welded frame, and a thermal expansion guide groove is provided at the connection between the key crossbeam and the bearing seat; The cooling system (4) and temperature control system include a roll heating unit for heating the roll shaft system (2), a feed bin for metering, a temperature sensor, and a central control system; the roll cooling unit is connected to the internal cooling channel through a rotary joint; the central control system independently controls the roll cooling unit and the feed bin cooling unit according to the feedback signal from the temperature sensor.

2. The high-temperature roller pressing pelletizing machine according to claim 1, characterized in that: The forming roll also has an internal cooling channel that is independent of the internal cooling channel.

3. The high-temperature roller pressing pelletizing machine according to claim 1, characterized in that: The bearing unit of the rolling mill system is connected to an independent bearing cooling circulation pipeline.

4. A high-temperature roller pressing pelletizing machine according to claim 1, characterized in that: The frame (1) is provided with a thermal compensation structure, which is a thermal expansion guide groove or a flexible support component.

5. A high-temperature roller pressing pelletizing machine according to claim 1, characterized in that: The feed hopper is a jacketed structure with a heat insulation layer and built-in cooling elements.

6. A high-temperature roller pressing pelletizing machine according to claim 1, characterized in that: The high-temperature roller pelletizing machine is also equipped with a heat insulation system, which includes a removable heat insulation cover that wraps around the non-working area of ​​the forming roller and the outside of the feeding bin, as well as a heat insulation protection plate set around the equipment.

7. A high-temperature roller pressing pelletizing machine according to claim 1, characterized in that: The roll skin of the roller can be in various granulation shapes such as hemispherical, semi-spherical, and flat.

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