Dry ice particle grinding machine
By using a flat-blade grinding disc and a gap adjustment module, the problems of uneven dry ice grinding and heat generation are solved, achieving efficient and uniform dry ice particle grinding to meet the needs of industrial production.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- XIAMEN HOREC02 DRY ICE BLASTING EQUIP & SERVICE CO LTD
- Filing Date
- 2025-05-28
- Publication Date
- 2026-05-12
AI Technical Summary
Existing dry ice grinding equipment suffers from problems such as uneven grinding, excessive heat generation, complex structure, and high maintenance costs, making it difficult to meet the needs of industrial production.
The grinding method uses a flat blade grinding disc. By leveraging the shearing force between the rotating and fixed blade discs, combined with a gap adjustment module, it achieves efficient and uniform grinding of dry ice particles, reduces frictional heat generation, and employs low-temperature lubrication and insulation design to adapt to the low-temperature characteristics of dry ice.
It improves the grinding efficiency and uniformity of dry ice particles, reduces dry ice sublimation loss, and has a simple structure and is easy to maintain, meeting the needs of industrial production.
Smart Images
Figure CN224221447U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of dry ice crushing technology, and in particular to a dry ice particle grinder. Background Technology
[0002] With the continuous development of industrial production, dry ice has been widely used in many fields, such as refrigeration, cleaning, and preservation. In these applications, grinding dry ice into granules is a common requirement to better enable it to perform its functions. Currently, there are some limitations to the methods used for grinding dry ice granules.
[0003] Traditional dry ice grinding equipment mostly employs simple mechanical cutting or extrusion methods, but these methods have several problems. First, the grinding uniformity is poor, making it impossible to guarantee the consistency of dry ice particle size, resulting in unstable performance in practical applications. Second, the grinding process easily generates a large amount of heat, and dry ice sublimates rapidly when heated, which not only reduces the utilization rate of dry ice but may also damage the equipment. Furthermore, existing dry ice grinding equipment has a complex structure, high maintenance costs, and low grinding efficiency, making it difficult to meet the needs of large-scale industrial production.
[0004] Flat-blade grinding technology has been widely used in fields such as coffee bean grinding. It uses a pair of parallel grinding discs to compress and grind materials, achieving good grinding uniformity and a relatively stable grinding process. However, the application of flat-blade grinding technology to dry ice pellet grinding has not yet been fully explored and developed. The physical properties of dry ice differ significantly from those of coffee beans and other materials; it has lower hardness and is prone to sublimation. Therefore, targeted improvements and optimizations to the flat-blade grinding technology are needed to meet the specific requirements of dry ice pellet grinding.
[0005] In summary, the market currently lacks a grinding device that can efficiently and uniformly grind dry ice particles while effectively controlling heat generation, and is also simple in structure and easy to maintain. Therefore, developing a dry ice particle grinding device based on flat-blade grinding technology is of significant practical importance, as it can fill a market gap and meet the high-quality requirements for dry ice particle grinding in industrial production. Utility Model Content
[0006] The main technical problem to be solved by this utility model is to provide a dry ice particle grinder that can effectively improve the grinding efficiency and uniformity of dry ice particles by using a flat blade grinding disc, while reducing the sublimation loss of dry ice during the grinding process.
[0007] To solve the above-mentioned technical problems, this utility model provides a dry ice particle grinder, including a grinding mechanism, a transmission mechanism and a gap adjustment module; the grinding mechanism includes a base with a grinding chamber and a pair of parallel grinding discs, the upper end face of the base is provided with an opening communicating with the grinding chamber, and the grinding discs are installed in the grinding chamber through the opening;
[0008] Dry ice is ground between a pair of grinding discs; the pair of grinding discs are divided into a rotating cutter disc and a fixed cutter disc, and there is a gap between the rotating cutter disc and the fixed cutter disc, the gap forming a grinding gap;
[0009] The transmission mechanism is used to drive the rotating cutter head to rotate, and the fixed cutter head is circumferentially fixed relative to the rotating cutter head; the gap adjustment module is located above the base, and the gap adjustment module includes a dry ice inlet channel, which is connected to the grinding chamber. Dry ice particles fall from the dry ice inlet channel into the grinding chamber and enter the grinding gap to be ground into dry ice powder.
[0010] The gap adjustment module is used to drive the fixed cutter head to move in a direction toward or away from the rotating cutter head. The rotating cutter head is axially fixed relative to the fixed cutter head, and the size of the grinding gap is adjusted by the gap adjustment module.
[0011] In a preferred embodiment, a rotary tool holder is provided inside the grinding chamber, and the rotary tool disc is mounted on the rotary tool holder;
[0012] The transmission mechanism includes a motor and a rotating shaft. The rotating shaft is located below the rotating tool holder and connected to the rotating tool holder. The motor is located below the base. The output shaft of the motor is connected to the rotating shaft. The motor drives the rotating tool holder to rotate through the rotating shaft, thereby driving the rotating tool disc to rotate.
[0013] In a preferred embodiment, the grinding chamber is provided with a first stepped surface and a second stepped surface that protrude radially, and an annular pad is provided between the rotating shaft and the rotating tool holder. The rotating tool holder is in a limiting fit with the first stepped surface, and the annular pad is in a limiting fit with the second stepped surface.
[0014] The annular pad is fitted onto the rotating shaft, and a bearing is fitted onto the rotating shaft below the annular pad; an annular sealing groove is formed on the end face of the annular pad facing the bearing, and an annular sealing ring is placed inside the annular sealing groove;
[0015] The bearing is a low-temperature lubricated deep groove ball bearing or angular contact bearing; the sealing ring is a low-temperature resistant sealing ring.
[0016] In a preferred embodiment, the base is a double-layer heat-insulating base, wherein the inner layer of the double-layer heat-insulating base is made of stainless steel or aluminum alloy, and the outer layer is made of heat-insulating material.
[0017] The rotating cutter head is made of titanium alloy and has undergone low-temperature surface hardening treatment, with a hardness ≥ HRC60; the fixed cutter head is made of 316L stainless steel and has a diamond-like carbon (DLC) coating on its surface.
[0018] In a preferred embodiment, at least one or two discharge ports are provided on the side wall of the base. The discharge ports are connected to the grinding chamber and are located below the grinding gap. The ground dry ice powder is discharged from the discharge ports.
[0019] The lower side of the discharge port is set as a bevel, and the discharge port is connected to a material guide channel or a detachable stop is provided at the discharge port.
[0020] In a preferred embodiment, the gap adjustment module includes a movable seat, an adjusting seat, and a fixed seat. The base has four guide posts on the periphery of the opening. The fixed seat is fixed above the base by the four guide posts, and there is a gap between the fixed seat and the base.
[0021] The movable seat is provided with four guide holes corresponding to the four guide posts. The guide holes are slidably engaged with the guide posts. The movable seat is movably installed in the interval through the engagement of the guide holes and the guide posts.
[0022] The fixed cutter head is installed below the movable seat, and the adjusting seat is used to drive or restrict the movement of the movable seat along the length direction of the guide column;
[0023] The adjusting seat cooperates with the moving seat to adjust the axial position of the fixed cutter head, thereby adjusting the size of the grinding gap. The opening is used to allow the moving seat to move.
[0024] In a preferred embodiment, the fixed seat has an internal threaded hole, the adjusting seat is a cylindrical structure, the adjusting seat has an external thread, and the adjusting seat is screwed onto the fixed seat through the external thread and the internal threaded hole;
[0025] The lower end of the adjusting seat passes through the internal threaded hole and is connected to the movable seat. Rotating the adjusting seat can drive the movable seat to move through the cooperation of the external thread and the internal threaded hole.
[0026] A spring is fitted onto the guide post, and the two ends of the spring are respectively connected to the movable seat and the base.
[0027] In a preferred embodiment, the fixing seat is provided with a scale ring on the end face of the internal threaded hole, and the adjusting seat is provided with an indicator structure corresponding to the scale ring; the accuracy of the scale ring is set at 5μm increments, and the adjustment range of the grinding gap is set to 50-5000μm.
[0028] In a preferred embodiment, the rotary tool holder is provided with a plurality of limiting posts at intervals along the edge of the rotary tool disc, the plurality of limiting posts being used to radially restrict the movement of the rotary tool disc;
[0029] The axial portion of the limiting post protrudes from the rotating cutter head, and the protruding portion of the limiting post is radially limited and engaged with the fixed cutter head.
[0030] In a preferred embodiment, the grinding surface of the fixed cutter disc is provided with a first upper grinding surface and a second upper grinding surface in the radial direction from the inside to the outside, and the grinding surface of the rotating cutter disc is provided with a first lower grinding surface and a second lower grinding surface in the radial direction from the inside to the outside.
[0031] The first upper grinding surface and the second upper grinding surface are respectively disposed opposite to the first lower grinding surface and the second lower grinding surface. The first upper grinding surface and the first lower grinding surface are two inclined surfaces with opposite slopes, and the second upper grinding surface and the second lower grinding surface are two parallel planes.
[0032] Dry ice particles are introduced between the second upper grinding surface and the second lower grinding surface through the inclined surfaces of the first upper grinding surface and the first lower grinding surface.
[0033] Compared with the prior art, the technical solution of this utility model has the following beneficial effects:
[0034] 1. By incorporating a grinding mechanism, transmission mechanism, and gap adjustment module, and employing a flat-blade grinding disc, the shearing force between the rotating and fixed blade discs achieves highly efficient grinding of dry ice particles, increasing crushing efficiency by over 30%. The gap adjustment module allows for precise control of the grinding gap size, with an accuracy error ≤ ±5μm, ensuring the uniformity of the dry ice particles.
[0035] 2. Utilizing the low-temperature brittleness of dry ice below -50℃, controllable crushing is achieved through the shear stress concentration effect of the parallel cutter disc: the rotating cutter disc and the fixed cutter disc form a grinding gap, and the rotating cutter disc rotates at a low speed of 50-1000 rpm to reduce frictional heat generation. Attached Figure Description
[0036] Figure 1 This is a schematic diagram of the dry ice particle grinder in a preferred embodiment of the present invention;
[0037] Figure 2 This is a schematic diagram showing the cooperation between the grinding mechanism and the gap adjustment module in a preferred embodiment of the present invention;
[0038] Figure 3 This is a side sectional view of the ice particle grinder in a preferred embodiment of the present invention;
[0039] Figure 4 This is a schematic diagram of the structure of the gap adjustment module with a scale ring in a preferred embodiment of the present invention;
[0040] Figure 5 This is a schematic diagram illustrating the cooperation between a pair of parallel grinding discs and a rotating tool holder in a preferred embodiment of this utility model.
[0041] Figure 6 This is a side sectional view of a pair of parallel grinding discs in a preferred embodiment of the present invention.
[0042] Figure 7 This is a schematic diagram of the assembly and rotation of the rotary tool holder and the rotary tool disc in a preferred embodiment of this utility model;
[0043] Figure 8 This is a schematic diagram of the fixed cutter head in a preferred embodiment of the present invention.
[0044] Explanation of reference numerals in the attached drawings: 1. Grinding mechanism; 11. Base; 111. Grinding chamber; 1111. First stepped surface; 1112. Second stepped surface; 112. Opening; 113. Rotating cutter head; 1131. Limiting post; 114. Discharge port; 1141. Bevel; 115. Guide channel; 12. Fixed cutter head; 121. First upper grinding surface; 122. Second upper grinding surface; 13. Rotating cutter head; 131. First lower grinding surface; 132. Second lower grinding surface; 1 4. Grinding gap; 15. Guide post; 16. Spring component; 2. Transmission mechanism; 21. Motor; 22. Rotating shaft; 23. Annular pad; 24. Bearing; 25. Annular seal; 3. Gap adjustment module; 31. Dry ice inlet channel; 311. First channel; 312. Second channel; 32. Moving seat; 321. Guide hole; 33. Adjusting seat; 331. External thread; 34. Fixed seat; 341. Internal threaded hole; 35. Scale ring; 36. Indicating structure. Detailed Implementation
[0045] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.
[0046] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0047] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed", "equipped with", "sleeved / connected", "connected", etc., should be interpreted broadly. For example, "connection" can be a wall-mounted connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.
[0048] refer to Figures 1-8 This embodiment provides a dry ice pellet grinder, including a grinding mechanism 1, a transmission mechanism 2, and a gap adjustment module 3. The grinding mechanism 1 includes a base 11 with a grinding chamber 111 and a pair of parallel grinding discs. The upper surface of the base 11 has an opening 112 communicating with the grinding chamber 111, and the grinding discs are installed in the grinding chamber 111 through the opening 112. Dry ice is ground between the pair of grinding discs. The pair of grinding discs are divided into a rotating cutter disc 13 and a fixed cutter disc 12. There is a gap between the rotating cutter disc 13 and the fixed cutter disc 12, and the gap forms a grinding gap 14. The transmission mechanism 2 is used to drive the rotating cutter disc 13 to rotate, and the fixed cutter disc 12 is used to grind the dry ice between the rotating cutter disc 13 and the fixed cutter disc 14. The fixed disc 12 is circumferentially fixed relative to the rotating cutter disc 13; the gap adjustment module 3 is disposed above the base 11, and the gap adjustment module 3 includes a dry ice inlet channel 31, which is connected to the grinding chamber 111. Dry ice particles fall from the dry ice inlet channel 31 into the grinding chamber 111 and enter the grinding gap 14 to be ground into dry ice powder; the gap adjustment module 3 is used to drive the fixed cutter disc 12 to move in a direction toward or away from the rotating cutter disc 13, and the rotating cutter disc 13 is axially fixed relative to the fixed cutter disc 12. The size of the grinding gap 14 is adjusted by the gap adjustment module 3.
[0049] The shearing force between the rotating cutter head 13 and the fixed cutter head 12 enables efficient grinding of dry ice particles. Utilizing the low-temperature brittleness of dry ice below -50℃, controllable crushing is achieved through the shear stress concentration effect of the parallel cutter heads. Dry ice particles enter the grinding gap 14 under centrifugal force and undergo brittle fracture (non-plastic deformation) under the shearing force of the cutting edge. Compared with traditional mechanical cutting or extrusion methods, the crushing efficiency can be improved by 30%. The size of the grinding gap 14 can be precisely controlled by the gap adjustment module 3, with an accuracy error of ≤±5μm, ensuring the uniformity of the dry ice particles.
[0050] like Figure 3 The connection structure between the transmission mechanism 2 and the rotating cutter head 13 is as follows: a rotating cutter head 113 is provided inside the grinding chamber 111, and the rotating cutter head 13 is mounted on the rotating cutter head 113; the transmission mechanism 2 includes a motor 21 and a rotating shaft 22, the rotating shaft 22 is located below the rotating cutter head 113 and connected to the rotating cutter head 113, the motor 21 is located below the base 11, and the output shaft of the motor 21 is connected to the rotating shaft 22. The motor 21 drives the rotating cutter head 113 to rotate through the rotating shaft 22, thereby driving the rotating cutter head 13 to rotate. The rotating cutter head 13 is controlled by the motor 21 to rotate at a low speed of 50-1000 rpm to reduce frictional heat generation.
[0051] like Figure 3 The grinding chamber 111 has a first stepped surface 1111 and a second stepped surface 1112 that protrude radially. An annular pad 23 is provided between the rotating shaft 22 and the rotating tool holder 113. The rotating tool holder 113 is in a limiting fit with the first stepped surface 1111, and the annular pad 23 is in a limiting fit with the second stepped surface 1112. The annular pad 23 is fitted onto the rotating shaft 22, and a bearing 24 is fitted onto the rotating shaft 22 below the annular pad 23. An annular sealing groove is formed on the end face of the annular pad 23 facing the bearing 24, and an annular sealing ring 25 is built into the annular sealing groove. The bearing 24 is a low-temperature lubricated deep groove ball bearing 24 or an angular contact bearing 24. The sealing ring is a low-temperature resistant sealing ring.
[0052] The rotating cutter head 113 is driven to rotate by a motor 21 and a rotating shaft 22, ensuring the stable rotation of the rotating cutter head 13. An annular pad 23 and a low-temperature lubricated bearing 24 are provided between the rotating shaft 22 and the rotating cutter head 113 to further improve transmission stability and low-temperature adaptability. The use of a low-temperature lubricated deep groove ball bearing 24 or angular contact bearing 24 ensures a stable connection between the rotating shaft 22 and the rotating cutter head 113, preventing jamming and guaranteeing the rigidity of the rotating cutter head 13, thereby controlling the grinding accuracy of dry ice particles. A low-temperature resistant sealing ring is built into the annular sealing groove to effectively prevent condensate and powder from entering the bearing 24 in low-temperature environments, extending the service life of the equipment.
[0053] To ensure low-temperature grinding, the base 11 is a double-layered heat-insulating base 11. The inner layer of the double-layered heat-insulating base 11 is made of stainless steel or aluminum alloy, and the outer layer is made of heat-insulating material, effectively blocking heat exchange. The rotating cutter head 13 is made of titanium alloy and has undergone low-temperature hardening treatment, with a hardness ≥ HRC60. The fixed cutter head 12 is made of 316L stainless steel and has a diamond-like carbon (DLC) film coated on the surface, which is resistant to low-temperature brittleness and wear, ensuring wear resistance and stability in low-temperature environments.
[0054] like Figure 2-4 The dry ice pellet grinder is designed with at least one or two discharge ports 114 on the side wall of the base 11. These discharge ports 114 are connected to the grinding chamber 111 and located below the grinding gap 14. The ground dry ice powder is discharged through the discharge ports 114. The lower edge of the discharge port 114 is set as a bevel 1141. Several discharge ports 114 can be opened on the base 11 to achieve uniform material drop. The beveled edge 1141 of the discharge port 114 guides the material out, and in conjunction with the rotation of the rotating cutter disc 13, centrifugal force is used to collect and extrude the material, achieving continuous and uniform discharge. The discharge port 114 is externally connected to a material guide channel 115, or a detachable stop is provided at the discharge port 114. During use, the material is discharged through the material guide channel 115. When discharge is not required, the stop is used to block the discharge port 114 for easy operation and maintenance.
[0055] like Figure 2The specific structure of the gap adjustment module is as follows: the gap adjustment module 3 includes a movable seat 32, an adjustment seat 33, and a fixed seat 34. The base 11 has four guide posts 15 on the periphery of the opening 112. The fixed seat 34 is fixed above the base 11 by the four guide posts 15, and there is a gap between the fixed seat 34 and the base 11. The movable seat 32 has four guide holes 321 corresponding to the four guide posts 15. The guide holes 321 slide with the guide posts 15. The movable seat 32 is movably installed in the gap by the cooperation between the guide holes 321 and the guide posts 15. The fixed cutter disc 12 is installed below the movable seat 32. The adjustment seat 33 is used to drive or restrict the movement of the movable seat 32 along the length direction of the guide posts 15. The adjustment seat 33 cooperates with the movable seat 32 to adjust the axial position of the fixed cutter disc 12 to adjust the size of the grinding gap 14. The opening 112 is used to allow the movement of the movable seat 32.
[0056] like Figure 3 The dry ice inlet channel 31 includes a first channel 311 disposed within the adjusting seat 33 and a second channel 312 disposed within the movable seat 32. The first channel 311 has a funnel-shaped cross-section to facilitate the introduction of dry ice particles. The gap adjustment module 3, composed of the movable seat 32, adjusting seat 33, and fixed seat 34, enables precise movement of the fixed cutter disc 12, thereby adjusting the size of the grinding gap 14. The sliding fit between the guide post 15 and the guide hole 321 ensures stable movement of the movable seat 32, improving the operating accuracy of the equipment and ensuring precise adjustment and structural stability.
[0057] like Figure 3 The adjusting structure of the adjusting seat 33 is as follows: the fixed seat 34 has an internal threaded hole 341, the adjusting seat 33 is a cylindrical structure, and the adjusting seat 33 has an external thread 331. The adjusting seat 33 is screwed onto the fixed seat 34 through the external thread 331 and the internal threaded hole 341. The lower end of the adjusting seat 33 passes through the internal threaded hole 341 and is connected to the moving seat 32. Rotating the adjusting seat 33, through the engagement of the external thread 331 and the internal threaded hole 341, can drive the moving seat 32 to move. By rotating the adjusting seat 33, the moving seat 32 can be driven to move along the guide post 15, thereby adjusting the size of the grinding gap 14. By rotating the adjusting seat 33 through the precision thread, the distance between the fixed cutter head 12 and the rotating cutter head 13 can be adjusted, and the accuracy can be controlled within 5μm increments. The operation is simple.
[0058] like Figure 2 A spring element 16 is fitted onto the guide column 15, and the two ends of the spring element 16 are respectively connected to the movable seat 32 and the base 11. The spring element 16 fitted onto the guide column 15 provides elastic support, further improving the stability and adjustment accuracy of the equipment.
[0059] like Figure 4 To allow for more precise adjustment of the gap, a scale ring 35 is provided on the end face of the hole in the internal threaded hole 341 on the fixed seat 34, and an indicator structure 36 is provided on the adjusting seat 33 corresponding to the scale ring 35. The accuracy of the scale ring 35 is set at 5μm increments, and the adjustment range of the grinding gap 14 is set to 50-5000μm, so as to realize the visual adjustment of the grinding gap 14 and ensure the grinding accuracy.
[0060] like Figure 5 The fixed cutter head 12 and the rotating cutter head 13 are engaged in grinding. The rotating cutter head 113 is provided with a plurality of limiting posts 1131 spaced along the edge of the rotating cutter head 13. These limiting posts 1131 are used to radially restrict the movement of the rotating cutter head 13. The axial portion of each limiting post 1131 protrudes from the rotating cutter head 13, and the protruding portion of the limiting post 1131 engages radially with the fixed cutter head 12. This radial limiting design ensures structural stability and guarantees the stability of the grinding process.
[0061] like Figure 6-8 The grinding path of the dry ice particles is as follows: the grinding surface of the fixed blade 12 is provided with a first upper grinding surface 121 and a second upper grinding surface 122 radially from the inside to the outside; the grinding surface of the rotating blade 13 is provided with a first lower grinding surface 131 and a second lower grinding surface 132 radially from the inside to the outside; the first upper grinding surface 121 and the second upper grinding surface 122 are respectively arranged opposite to the first lower grinding surface 131 and the second lower grinding surface 132; the first upper grinding surface 121 and the first lower grinding surface 131 are two inclined surfaces with opposite slopes; the second upper grinding surface 122 and the second lower grinding surface 132 are two parallel planes; the dry ice particles are guided between the second upper grinding surface 122 and the second lower grinding surface 132 through the inclined surfaces of the first upper grinding surface 121 and the first lower grinding surface 131; the inclined grinding surfaces can guide the dry ice particles more evenly into the planar grinding area. The inclined surface design guides particles to move along a specific direction, preventing particles from accumulating or being unevenly distributed in the grinding gap 14, optimizing the grinding path, and improving grinding efficiency and particle uniformity.
[0062] In the dry ice particle grinding process, the process employs a combination of inclined grinding on the first upper grinding surface 121 and the first lower grinding surface 131, followed by planar grinding on the second upper grinding surface 122 and the second lower grinding surface 132. This approach better utilizes the grinding force, improving grinding efficiency and particle uniformity while reducing equipment wear and energy consumption. The inclined grinding surface design utilizes the initial impact force of the dry ice particles entering the grinding gap 14 to quickly break larger particles into smaller fragments. The initial crushing on the first upper grinding surface 121 and the first lower grinding surface 131 significantly reduces the difficulty of subsequent grinding, thereby improving grinding efficiency. Further fine grinding on the second upper grinding surface 122 and the second lower grinding surface 132 follows. After the inclined grinding, the dry ice particles enter the planar grinding area, where the planar grinding surface provides more uniform shear force, further grinding the particles into finer powder, improving particle uniformity and reducing particle size dispersion. This two-stage grinding method ensures that the dry ice particles are initially crushed before entering the planar grinding area, thus improving overall grinding efficiency.
[0063] The above description is only a preferred embodiment of the present utility model, but the design concept of the present utility model is not limited thereto. Any non-substantial modifications made to the present utility model by those skilled in the art within the scope of the technology disclosed in the present utility model using this concept shall be deemed as an infringement of the protection scope of the present utility model.
Claims
1. A dry ice pellet grinder, characterized in that: It includes a grinding mechanism, a transmission mechanism, and a gap adjustment module; the grinding mechanism includes a base with a grinding chamber and a pair of parallel grinding discs, the upper end face of the base has an opening communicating with the grinding chamber, and the grinding discs are installed in the grinding chamber through the opening; Dry ice is ground between a pair of grinding discs; the pair of grinding discs are divided into a rotating cutter disc and a fixed cutter disc, and there is a gap between the rotating cutter disc and the fixed cutter disc, the gap forming a grinding gap; The transmission mechanism is used to drive the rotating cutter head to rotate, and the fixed cutter head is circumferentially fixed relative to the rotating cutter head; The gap adjustment module is located above the base. The gap adjustment module includes a dry ice inlet channel, which is connected to the grinding chamber. Dry ice particles fall from the dry ice inlet channel into the grinding chamber and enter the grinding gap to be ground into dry ice powder. The gap adjustment module is used to drive the fixed cutter head to move in a direction toward or away from the rotating cutter head. The rotating cutter head is axially fixed relative to the fixed cutter head, and the size of the grinding gap is adjusted by the gap adjustment module.
2. The dry ice pellet grinder according to claim 1, characterized in that: A rotary tool holder is provided inside the grinding chamber, and the rotary tool disc is mounted on the rotary tool holder; The transmission mechanism includes a motor and a rotating shaft. The rotating shaft is located below the rotating tool holder and connected to the rotating tool holder. The motor is located below the base. The output shaft of the motor is connected to the rotating shaft. The motor drives the rotating tool holder to rotate through the rotating shaft, thereby driving the rotating tool disc to rotate.
3. A dry ice pellet grinder according to claim 2, characterized in that: The grinding chamber has a first stepped surface and a second stepped surface that protrude radially. An annular pad is provided between the rotating shaft and the rotating tool holder. The rotating tool holder is in a limiting fit with the first stepped surface, and the annular pad is in a limiting fit with the second stepped surface. The annular pad is fitted onto the rotating shaft, and a bearing is fitted onto the rotating shaft below the annular pad; an annular sealing groove is formed on the end face of the annular pad facing the bearing, and an annular sealing ring is placed inside the annular sealing groove; The bearing is a low-temperature lubricated deep groove ball bearing or angular contact bearing; the sealing ring is a low-temperature resistant sealing ring.
4. A dry ice pellet grinder according to claim 1, characterized in that: The base is a double-layer heat-insulating base, with the inner layer made of stainless steel or aluminum alloy and the outer layer made of heat-insulating material. The rotating cutter head is made of titanium alloy and has undergone low-temperature surface hardening treatment, with a hardness ≥ HRC60; the fixed cutter head is made of 316L stainless steel and has a diamond-like carbon (DLC) coating on its surface.
5. A dry ice pellet grinder according to claim 1, characterized in that: The base has at least one or two discharge ports on its side wall. The discharge ports are connected to the grinding chamber and are located below the grinding gap. The ground dry ice powder is discharged from the discharge ports. The lower side of the discharge port is set as a bevel, and the discharge port is connected to a material guiding channel or a detachable stop is provided at the discharge port.
6. A dry ice pellet grinder according to claim 1, characterized in that: The gap adjustment module includes a movable seat, an adjusting seat, and a fixed seat. The base has four guide posts on the periphery of the opening. The fixed seat is fixed above the base by the four guide posts, and there is a gap between the fixed seat and the base. The movable seat is provided with four guide holes corresponding to the four guide posts. The guide holes are slidably engaged with the guide posts. The movable seat is movably installed in the interval through the engagement of the guide holes and the guide posts. The fixed cutter head is installed below the movable seat, and the adjusting seat is used to drive or restrict the movement of the movable seat along the length direction of the guide column; The adjusting seat cooperates with the moving seat to adjust the axial position of the fixed cutter head, thereby adjusting the size of the grinding gap. The opening is used to allow the moving seat to move.
7. A dry ice pellet grinder according to claim 6, characterized in that: The fixed seat has an internal threaded hole, the adjusting seat is a cylindrical structure, the adjusting seat has an external thread, and the adjusting seat is screwed onto the fixed seat through the external thread and the internal threaded hole; The lower end of the adjusting seat passes through the internal threaded hole and is connected to the movable seat. Rotating the adjusting seat can drive the movable seat to move through the cooperation of the external thread and the internal threaded hole. A spring is fitted onto the guide post, and the two ends of the spring are respectively connected to the movable seat and the base.
8. A dry ice pellet grinder according to claim 7, characterized in that: The fixing seat has a graduated ring on the end face of the internal threaded hole, and the adjusting seat has an indicating structure corresponding to the graduated ring; the accuracy of the graduated ring is set at 5μm increments, and the adjustment range of the grinding gap is set to 50-5000μm.
9. A dry ice pellet grinder according to claim 2, characterized in that: The rotary tool holder is provided with a plurality of limiting posts at intervals along the edge of the rotary tool disc, and the plurality of limiting posts are used to radially restrict the movement of the rotary tool disc; The axial portion of the limiting post protrudes from the rotating cutter head, and the protruding portion of the limiting post is radially limited and engaged with the fixed cutter head.
10. A dry ice pellet grinder according to claim 1, characterized in that: The grinding surface of the fixed cutter disc is provided with a first upper grinding surface and a second upper grinding surface in the radial direction from the inside to the outside, and the grinding surface of the rotating cutter disc is provided with a first lower grinding surface and a second lower grinding surface in the radial direction from the inside to the outside. The first upper grinding surface and the second upper grinding surface are respectively disposed opposite to the first lower grinding surface and the second lower grinding surface. The first upper grinding surface and the first lower grinding surface are two inclined surfaces with opposite slopes, and the second upper grinding surface and the second lower grinding surface are two parallel planes. Dry ice particles are introduced between the second upper grinding surface and the second lower grinding surface through the inclined surfaces of the first upper grinding surface and the first lower grinding surface.