A sealed rotary discharging device for ice particle jet

Abstract

The application discloses a sealed rotary discharging device for ice particle jet, and belongs to the technical field of mechanical instrument machining. The sealed rotary discharging device for ice particle jet comprises, from top to bottom, an upper feeding assembly, a sealed cavity, a rotary discharging assembly, a dynamic sealing assembly and a lower discharging assembly. The sealed cavity comprises end plates and a plurality of side plates. The rotary discharging assembly comprises a rotating shaft, the rotating shaft extends to the outside of a discharging working cavity through the end plates at both ends, and at least one group of discharging and containing grooves are arranged on the cylindrical surface of the rotating shaft. The sealed cavity is enclosed by the side plates and the end plates into a fully-closed rectangular working cavity. The dynamic sealing assembly is matched with the rotating shaft and the sealed cavity in an interference fit, and a static seal and a dynamic seal double barrier are formed. When the rotating shaft rotates, the cylindrical surface of the rotating shaft always blocks the feeding flow channel and the discharging flow channel, a through channel cannot be formed, high-pressure airflow of the jet system cannot flow back from the discharging end to the feeding end, and the stability of jet pressure is ensured.

Description

Technical Field

[0001] This invention relates to the field of mechanical instrument processing technology, specifically to a sealed rotary feeding device for ice pellet jets. Background Technology

[0002] Ice jetting is a green and clean processing technology that uses low-temperature ice particles as abrasives. It is widely used in precision deburring, surface cleaning, and non-destructive rust removal. In an ice jetting system, the feeding device is the core component, and its performance directly determines the continuity of ice particle delivery, the stability of jet pressure, and the solid-state retention effect of the ice particles.

[0003] Existing ice pellet feeding devices mostly adopt open-type, gravity-flow, or spiral conveyor structures. On the one hand, because the device is set to an open type, the high-pressure airflow of the jet system is prone to backflow from the discharge port to the feed end, resulting in pressure relief and air leakage problems. This leads to large fluctuations in the jet outlet pressure, insufficient acceleration effect of ice pellets, and a significant decrease in processing accuracy and efficiency. On the other hand, hot air from the outside can easily enter the device during the feeding process. After contacting the low-temperature ice pellets, it causes the ice pellets to melt and stick together. This not only fails to form an effective abrasive impact but also easily causes pipeline blockage and jamming failures. Summary of the Invention

[0004] The purpose of this invention is to overcome the problems in the prior art and provide a sealed rotary feeding device for ice pellet jets.

[0005] This invention provides a sealed rotary feeding device for ice pellet jets, comprising, from top to bottom, an upper feeding assembly, a sealed cavity, a rotary feeding assembly, a dynamic sealing assembly, and a lower discharging assembly: the upper feeding assembly is fixedly installed at the top of the sealed cavity, and the lower discharging assembly is installed at the bottom of the sealed cavity; the dynamic sealing assembly includes a sealing block and a discharge square tube, the sealing block completely filling the sealed cavity, and the discharge square tube is connected vertically to the sealing block, with a pair of discharge square tubes respectively connected to the upper feeding assembly and the lower discharging assembly; the sealing block is made of polytetrafluoroethylene; the rotary feeding assembly... The component includes a rotating shaft, which is horizontally positioned and has at least one set of material receiving grooves on its cylindrical circumference. A circular through hole is horizontally formed on the sealing block, and the rotating shaft is rotatably inserted into the circular through hole, with both ends penetrating the sealing cavity. A rotary driver is connected to either end of the rotating shaft, and there is a gap between the rotating shaft and the circular through hole. The end of the material feeding square tube near the rotating shaft is configured as an arc-shaped surface extending into the sealing block, and the arc-shaped surface is fitted to the outer surface of the rotating shaft. The upper feeding component, the lower discharging component, and the material feeding square tube form a material feeding channel.

[0006] Preferably, the gap is 0.1mm to 0.3mm.

[0007] Preferably, four sets of material feeding troughs are provided, and the four sets of material feeding troughs are evenly distributed at 90° along the circumference of the rotation axis, and the material feeding troughs are rectangular.

[0008] Preferably, the upper feeding assembly includes a feeding trough, a first flange, and a feeding channel. The feeding trough is configured as a tapered structure that is wider at the top and narrower at the bottom. The feeding channel is vertically opened inside the feeding trough and is connected to the discharge trough. The top of the feeding trough is connected to the ice pellet storage bin through the first flange.

[0009] Preferably, the lower discharge assembly and the upper feed assembly are coaxially distributed vertically. The lower discharge assembly includes a discharge trough, a discharge channel, and a second flange. The second flange is integrally formed at the top of the discharge channel. The discharge trough is configured as a tapered structure that is wider at the top and narrower at the bottom. The discharge channel is formed inside the discharge trough.

[0010] Preferably, the rotating shaft is a solid cylindrical stainless steel shaft.

[0011] Preferably, the sealing block is interference-fitted with the mounting groove of the end plate.

[0012] Compared with the prior art, the beneficial effects of the present invention are: The sealing cavity is enclosed by the side plate and the end plate to form a fully enclosed rectangular working cavity. With the interference fit between the sealing block and the rotating shaft in the dynamic sealing assembly and the interference fit between the sealing block and the sealing cavity, a dual barrier of static sealing and dynamic sealing is formed. When rotating, the cylindrical surface of the rotating shaft always blocks the feed channel and the discharge channel, and a through channel cannot be formed. The high-pressure airflow of the jet system cannot backflow from the discharge end to the feed end, ensuring the stability of the jet pressure. The fully enclosed cavity, combined with dynamic sealing components, blocks the contact between external hot air and low-temperature ice particles, preventing ice particles from sticking together and reducing hardness, maintaining the abrasive's impact performance, and eliminating pipeline blockage caused by melted water. The material receiving groove on the cylindrical surface of the rotating shaft rotates with the shaft. Each rotation completes the material receiving, conveying and unloading cycle. The material feeding amount can be precisely controlled by adjusting the rotation speed. The continuous feeding has high uniformity and is suitable for various working conditions such as precision deburring and heavy rust removal. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the side cross-sectional structure of the present invention; Figure 3 This is a schematic diagram of the dynamic sealing assembly structure of the present invention; Figure 4 This is a schematic diagram of the sealing block structure of the present invention; Figure 5 This is a schematic diagram of the connection structure between the feeding square tube and the sealing block of the present invention; Figure 6 This is a schematic diagram of the rotating shaft structure of the present invention; Figure 7 This is a schematic diagram of the upper feeding assembly structure of the present invention; Figure 8 This is a schematic diagram of the lower discharge assembly structure of the present invention.

[0014] Explanation of reference numerals in the attached drawings: 1. Upper feeding assembly; 101. Feed chute; 102. First flange; 103. Feed channel; 2. Lower discharging assembly; 201. Discharging chute; 202. Discharging channel; 203. Second flange; 3. Sealing cavity; 301. End plate; 302. Side plate; 4. Rotary unloading assembly; 41. Rotating shaft; 42. Unloading trough; 5. Dynamic sealing assembly; 51. Circular through hole; 52. Sealing block; 6. Unloading square tube. Detailed Implementation

[0015] The following is in conjunction with the appendix Figures 1-8 To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by those skilled in the art.

[0016] The terms "first," "second," and similar words used in the patent application specification and claims of this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Terms such as "inner," "outer," "upper," "lower," "far," "near," "front," and "rear" are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. The drawings in this invention are not strictly drawn to scale; the specific dimensions and quantity of each structure can be determined according to actual needs. The drawings described in this invention are merely structural schematic diagrams.

[0017] This invention provides a sealed rotary feeding device for ice pellet jets, such as... Figures 1-8As shown, the assembly includes, from top to bottom, an upper feeding component 1, a sealed cavity 3, a rotary feeding component 4, a dynamic sealing component 5, and a lower discharging component 2: the upper feeding component 1 is fixedly installed at the top of the sealed cavity 3, and the lower discharging component 2 is installed at the bottom of the sealed cavity 3; the dynamic sealing component 5 includes a sealing block 52 and a discharge square tube 6, the sealing block 52 completely fills the sealed cavity 3, and the sealing block 52 is connected to the upper and lower parts by the discharge square tube 6, a pair of discharge square tubes 6 are respectively connected to the upper feeding component 1 and the lower discharging component 2, and the sealing block 52 is made of polytetrafluoroethylene; the rotary feeding component 4 includes a rotating shaft 41 The rotating shaft 41 is horizontally set, and at least one set of material receiving grooves 42 are opened on the circumference of the cylindrical surface of the rotating shaft 41; a circular through hole 51 is horizontally opened on the sealing block 52, the rotating shaft 41 is rotatably inserted into the circular through hole 51, and both ends pass through the sealing cavity 3. A rotary driver is connected to any end of the rotating shaft 41, and there is a gap between the rotating shaft 41 and the circular through hole 51; the end of the material feeding square tube 6 near the rotating shaft 41 is set as an arc surface extending into the sealing block 52, and the arc surface is fitted with the outer surface of the rotating shaft 41. The upper feeding component, the lower discharging component 2 and the material feeding square tube 6 form a material feeding channel.

[0018] In this embodiment, the sealing cavity is enclosed by the side plate 302 and the end plate 301 to form a fully enclosed rectangular working cavity. With the interference fit between the sealing block 52 in the dynamic sealing assembly 5 and the rotating shaft 41, and the interference fit between the sealing block 52 and the mounting groove of the end plate 301, a dual barrier of static sealing and dynamic sealing is formed. When rotating, the cylindrical surface of the rotating shaft 41 always blocks the feed channel and the discharge channel, and a through channel cannot be formed. The high-pressure airflow of the jet system cannot backflow from the discharge end to the feed end, ensuring the stability of the jet pressure. The fully enclosed cavity, combined with the dynamic sealing component 5, blocks the contact between external hot air and low-temperature ice particles, preventing ice particles from sticking together and reducing hardness, maintaining the abrasive impact performance, and eliminating pipeline blockage caused by melted water. The material receiving trough 42 on the cylindrical surface of the rotating shaft 41 rotates with the shaft. Each rotation completes the cycle of receiving, conveying and unloading. The material feeding amount can be precisely controlled by adjusting the rotation speed. The continuous feeding has high uniformity and is suitable for various working conditions such as precision deburring and heavy rust removal.

[0019] When applied to low-pressure jetting, there is no need to configure a high-pressure storage silo and pressurization system. The storage silo only needs to meet the requirements of normal / low pressure, reducing the difficulty and cost of equipment manufacturing, while avoiding the safety hazards of high-pressure storage. Material can be directly added to the storage silo under low / normal pressure conditions. The feeding process does not require depressurization or shutdown of the system, which greatly improves continuous operation time and work efficiency.

[0020] Preferred, such as Figures 1-2 As shown, the gap is 0.1mm~0.3mm.

[0021] In this embodiment, the gap between the rotating shaft 41 and the circular through hole 51 is limited to 0.1mm~0.3mm, which is a precise design for the low-temperature working conditions of ice particle jet: if the gap is >0.3mm, it will cause high-pressure gas leakage, increase jet pressure fluctuation, and ice particles are easy to get stuck in the gap, causing wear on the rotating shaft 41; if the gap is <0.1mm, the low-temperature contraction of the rotating shaft 41 will easily cause jamming, and the frictional heat will cause the temperature of the sealing block 52 to rise above 0°C, accelerating the melting of ice particles.

[0022] Preferred, such as Figure 6 As shown, four sets of material receiving troughs 42 are provided. The four sets of material receiving troughs 42 are evenly distributed at 90° along the circumference of the rotation axis 41, and the material receiving troughs 42 are rectangular.

[0023] In this embodiment, four sets of material troughs ensure that the rotating shaft 41 completes one feeding cycle every 90° of rotation, meeting the continuous feeding requirements of high-speed processing. The uniform 90° distribution ensures that the rotating shaft 41 is subjected to balanced forces, avoiding eccentric vibration and extending the life of the bearings and sealing blocks 52. The rectangular troughs are precisely matched with the diameters of the inlet and outlet channels, achieving a high ice particle filling rate without compression or breakage. The right-angled structure of the rectangular troughs also prevents ice particles from remaining in the troughs, preventing material jamming caused by the melting and freezing of residual ice particles.

[0024] Preferred, such as Figures 1-5 As shown, the sealing block 52 is made of low-temperature resistant and wear-resistant polytetrafluoroethylene. The sealing block 52 is equipped with a discharge square tube 6 at both the top and bottom. The pair of discharge square tubes 6 are connected to the upper feeding component 1 and the lower discharging component 2 respectively, forming a discharge channel. The end of the discharge square tube 6 near the rotating shaft 41 is set to be arc-shaped and fits against the outer surface of the rotating shaft 41.

[0025] In this embodiment, the upper and lower inserted square tubes 6 of the sealing block 52 are coaxially connected with the inlet and outlet channels to prevent ice particles from splashing and colliding in the cavity; the square cross section of the square tube 6 matches the rectangular opening of the material trough to ensure that the ice particles fall into the trough without scattering and wasting; the dynamic sealing component 5 adopts a low-temperature resistant, wear-resistant and self-lubricating polytetrafluoroethylene sealing block, which is perfectly adapted to the low temperature and dry-wet alternating working conditions of ice particle feeding, and avoids low-temperature embrittlement and rapid wear of the sealing components.

[0026] Preferred, such as Figure 7 As shown, the upper feeding assembly 1 includes a feeding trough 101, a first flange 102, and a feeding channel 103. The feeding trough 101 is configured as a tapered structure that is wider at the top and narrower at the bottom. The feeding channel 103 is vertically opened inside the feeding trough 101. The feeding channel 103 is connected to the unloading trough 42. The top of the feeding trough 101 is connected to the ice pellet storage bin through the first flange 102.

[0027] In this embodiment, the tapered feed trough 101 has a taper of 15°~20°, which uses the component of gravity to break the van der Waals forces and electrostatic adsorption between ice particles; the feed channel 103 is precisely aligned with the storage tank to ensure that the ice particles fall vertically into the tank without breakage caused by lateral impact; the first flange 102 is sealed to the storage bin by 6 M10 bolts, and a low-temperature resistant nitrile rubber gasket is installed on the flange face, which still maintains elasticity at -40℃ to prevent external hot air from entering from the connection.

[0028] Preferred, such as Figure 8 As shown, the lower discharge assembly 2 and the upper feed assembly 1 are coaxially distributed vertically. The lower discharge assembly 2 includes a discharge trough 201, a discharge channel 202, and a second flange 203. The second flange 203 is integrally formed at the top of the discharge channel 202. The discharge trough 201 is configured as a tapered structure that is wider at the top and narrower at the bottom. The discharge channel 202 is opened in the discharge trough 201.

[0029] In this embodiment, the lower discharge assembly 2 is defined as a tapered discharge trough 201 (wider at the top and narrower at the bottom) and a second flange 203, which enables smooth discharge of ice particles and connection with the jet pipeline: the tapered discharge trough 201 has a contraction angle of 10°~15° to prevent ice particles from accumulating at the discharge port; the discharge channel 202 is coaxially connected to the material container to ensure that the ice particles fall vertically into the jet pipeline without lateral collision and breakage; the second flange 203 is sealed to the jet pipeline by 6 M10 bolts, and a low-temperature resistant rubber gasket is installed on the flange face to prevent leakage under a jet pressure of 10MPa, and the tapered interface smoothly transitions to the inner diameter of the pipeline to avoid kinetic energy loss caused by ice particles hitting the pipe wall.

[0030] Preferred, such as Figure 6 As shown, the rotating shaft 41 is a solid cylindrical stainless steel shaft.

[0031] In this embodiment, the rotating shaft 41 is a solid cylindrical stainless steel shaft, which solves the problems of insufficient strength and wear at low temperatures: the solid structure has a yield strength ≥205MPa at -40℃, which can withstand the impact load of ice particles and avoid shaft deformation; the corrosion resistance of stainless steel is better than that of carbon steel, and it can be used for a long time in ice melt water without rusting. The interference fit of the sealing block 52 is controlled at 0.02mm~0.05mm, which ensures the sealing performance and avoids rotation jamming caused by excessive interference.

[0032] Preferred, such as Figures 2-5 As shown, the sealing block 52 is interference-fitted with the mounting groove of the end plate 301.

[0033] In this embodiment, the sealing block 52 is interference-fitted with the mounting groove of the end plate 301 to enhance the reliability of the static seal: the interference fit ensures that the outer ring of the sealing block 52 and the mounting groove of the end plate 301 form a tight fit between metal and plastic, with no gap leakage path; combined with the interference fit between the inner ring of the sealing block 52 and the rotating shaft 41, a double interference seal is formed. Under the reverse pressure of 10MPa of the jet system, the sealing block 52 does not shift or deform; the interference fit can also absorb the radial runout of the rotating shaft 41, preventing the sealing block 52 from having gaps due to shaft runout, and further improving the service life of the dynamic seal.

[0034] The sealed rotary feeding device for ice jet propulsion of the present invention is used as follows: Before use, first tighten the two side shaft plates and side panels of the sealing cavity 3 with high-strength internal hex bolts, and install low-temperature resistant nitrile rubber sealing gaskets on the connection surfaces; align the first flange 102 of the upper feeding assembly 1 with the outlet of the ice pellet storage bin, and seal and fix it with 6 M10 bolts, with rubber gaskets on the flange surfaces; connect the second flange 203 of the lower discharge assembly 2 to the high-pressure pipeline of the ice pellet jet system, and similarly install and tighten the sealing gaskets; connect the drive connection end of the rotating shaft 41 to the output shaft of the geared motor through a coupling, and check whether the rotating shaft 41 rotates smoothly; finally, confirm that the sealing block 52 of the dynamic sealing assembly 5 has been embedded in the mounting groove of the two side shaft plates, with the inner ring fitting against the outer wall of the rotating shaft 41 and the outer ring having an interference fit with the mounting groove.

[0035] Set the speed of the geared motor according to the processing requirements: 50rpm~100rpm for precision deburring scenario, and 200rpm~300rpm for heavy rust removal scenario; start the ice particle storage bin, and the ice particles fall into the unloading working chamber through the conical feed channel under the action of gravity, filling the unloading trough 42 above the rotating shaft 41; start the geared motor, drive the rotating shaft 41 to rotate at a fixed speed according to the set speed, and when the trough rotates with the shaft to the bottom, the ice particles fall into the jet pipeline through the conical discharge channel under the action of gravity, completing the receiving, conveying and unloading cycle.

[0036] During operation, observe whether the jet pressure is stable. If the pressure rises abnormally, check whether the discharge channel is blocked. Regularly check the wear of the sealing block 52. If the wear of the sealing lip is found to be >0.5mm, replace it in time. When stopping the machine, first close the storage hopper, and after the ice particles in the material tank are emptied, stop the motor and clean the residual ice particles in the cavity. Before long-term shutdown, disassemble the sealing block 52 and apply silicone oil for maintenance to prevent low-temperature aging.

[0037] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sealed rotary feeding device for ice pellet jets, characterized in that, It includes an upper feeding assembly, a sealed cavity, a rotary feeding assembly, a dynamic sealing assembly, and a lower discharging assembly arranged from top to bottom: the upper feeding assembly is fixedly installed on the top of the sealed cavity, and the lower discharging assembly is installed on the bottom of the sealed cavity; The dynamic sealing assembly includes a sealing block and a discharge square tube. The sealing block completely fills the sealing cavity. The discharge square tube is connected to the upper and lower parts of the sealing block. A pair of discharge square tubes are respectively connected to the upper feeding assembly and the lower discharging assembly. The sealing block is made of polytetrafluoroethylene. The rotary feeding assembly includes a rotating shaft, which is horizontally positioned. At least one set of feeding grooves is formed on the circumference of the cylindrical surface of the rotating shaft. A circular through hole is horizontally formed on the sealing block. The rotating shaft is rotatably inserted into the circular through hole, and both ends of the rotating shaft pass through the sealing cavity. A rotary driver is connected to any one end of the rotating shaft. There is a gap between the rotating shaft and the circular through hole. The feeding square tube is provided with an arc-shaped surface extending into the sealing block near one end of the rotating shaft. The arc-shaped surface is fitted to the outer surface of the rotating shaft. The upper feeding assembly, the lower discharging assembly, and the feeding square tube form a feeding channel.

2. The sealed rotary feeding device for ice pellet jet as described in claim 1, characterized in that, The gap is 0.1mm to 0.3mm.

3. The sealed rotary feeding device for ice pellet jet as described in claim 1, characterized in that, The material feeding trough is provided in four sets, and the four sets of material feeding troughs are evenly distributed at 90° along the circumference of the rotation axis. The material feeding trough is rectangular.

4. The sealed rotary feeding device for ice pellet jet as described in claim 1, characterized in that, The upper feeding assembly includes a feeding trough, a first flange, and a feeding channel. The feeding trough is configured as a tapered structure that is wider at the top and narrower at the bottom. The feeding channel is vertically opened inside the feeding trough and is connected to the discharge trough. The top of the feeding trough is connected to the ice granule storage bin through the first flange.

5. The sealed rotary feeding device for ice pellet jet as described in claim 1, characterized in that, The lower discharge assembly and the upper feed assembly are coaxially distributed vertically. The lower discharge assembly includes a discharge trough, a discharge channel, and a second flange. The second flange is integrally formed at the top of the discharge channel. The discharge trough is a tapered structure that is wider at the top and narrower at the bottom. The discharge channel is formed inside the discharge trough.

6. The sealed rotary feeding device for ice pellet jet as described in claim 1, characterized in that, The rotating shaft is a solid cylindrical stainless steel shaft.

7. The sealed rotary feeding device for ice pellet jet as described in claim 1, characterized in that, The sealing block is interference-fitted with the mounting groove of the end plate.

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