CN110369403B - Dry ice cleaning nozzle, dry ice cleaning machine and secondary pollution prevention dry ice cleaning method - Google Patents
Dry ice cleaning nozzle, dry ice cleaning machine and secondary pollution prevention dry ice cleaning method Download PDFInfo
- Publication number
- CN110369403B CN110369403B CN201910634725.9A CN201910634725A CN110369403B CN 110369403 B CN110369403 B CN 110369403B CN 201910634725 A CN201910634725 A CN 201910634725A CN 110369403 B CN110369403 B CN 110369403B
- Authority
- CN
- China
- Prior art keywords
- dry ice
- nozzle
- air
- block
- gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 153
- 235000011089 carbon dioxide Nutrition 0.000 title claims abstract description 153
- 238000004140 cleaning Methods 0.000 title claims abstract description 85
- 238000000034 method Methods 0.000 title claims abstract description 13
- 230000002265 prevention Effects 0.000 title abstract description 3
- 230000001681 protective effect Effects 0.000 claims abstract description 33
- 238000005507 spraying Methods 0.000 claims abstract description 24
- 238000002156 mixing Methods 0.000 claims description 44
- 239000002245 particle Substances 0.000 claims description 34
- 238000007667 floating Methods 0.000 claims description 21
- 238000007599 discharging Methods 0.000 claims description 10
- 238000005192 partition Methods 0.000 claims description 5
- 238000005422 blasting Methods 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 15
- 230000000694 effects Effects 0.000 abstract description 5
- 239000012535 impurity Substances 0.000 abstract description 5
- 238000009833 condensation Methods 0.000 abstract description 3
- 230000005494 condensation Effects 0.000 abstract description 3
- 230000008569 process Effects 0.000 abstract description 3
- 239000003344 environmental pollutant Substances 0.000 abstract description 2
- 231100000719 pollutant Toxicity 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 71
- 239000000843 powder Substances 0.000 description 16
- 238000005299 abrasion Methods 0.000 description 7
- 230000009471 action Effects 0.000 description 6
- 238000009792 diffusion process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000004809 Teflon Substances 0.000 description 2
- 229920006362 Teflon® Polymers 0.000 description 2
- 230000003749 cleanliness Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 230000003116 impacting effect Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B13/00—Accessories or details of general applicability for machines or apparatus for cleaning
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B5/00—Cleaning by methods involving the use of air flow or gas flow
- B08B5/02—Cleaning by the force of jets, e.g. blowing-out cavities
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
- B08B7/0064—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by temperature changes
- B08B7/0092—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by temperature changes by cooling
Abstract
The invention discloses a dry ice cleaning nozzle, a dry ice cleaning machine and a secondary pollution prevention dry ice cleaning method, wherein the dry ice cleaning nozzle comprises a nozzle main body, a dry ice conveying pipe and a dry ice airflow spraying channel; the air curtain nozzle is arranged on the periphery of the nozzle body in a surrounding mode and comprises an inner cavity arranged on the periphery of the nozzle body in a surrounding mode and a connecting port which is communicated with the inner cavity and used for connecting a protective air source through a protective air pipe, and the air curtain nozzle forms a protective air curtain arranged on the periphery of the dry ice jet flow ejected by the nozzle body in a surrounding mode. According to the scheme, the protective air curtain formed by the protective air is arranged on the periphery of the dry ice jet flow, so that the cleaning surface can be effectively isolated from the outside air, pollutants such as impurities and water vapor are prevented from contacting the cleaning surface, meanwhile, the cleaned surface is purged through the protective air curtain, the cleaned surface can be dried and restored to the room temperature, the problem of water vapor condensation and fogging is solved, and the whole process can be protected, so that the cleaning effect is ensured.
Description
Technical Field
The invention relates to the field of dry ice cleaning equipment, in particular to a dry ice cleaning nozzle, a dry ice cleaning machine and a dry ice cleaning method for preventing secondary pollution.
Background
The dry ice cleaning machine is one of cleaning machines, and the dry ice cleaning mode has been rapidly developed in the global scope.
The dry ice cleaning system sprays dry ice particles of the dry ice cleaning machine to a working surface to be cleaned through high-pressure air, and different substances are separated under different shrinkage speeds by utilizing physical reflection of temperature difference. When the dry ice particles at the temperature of minus 78 ℃ contact the surface of the dirt, embrittlement explosion phenomenon can be generated, so that the dirt is contracted and loosened, and then the dry ice particles are instantaneously gasified and expanded for 800 times, so that strong stripping force is generated, the dirt is rapidly and thoroughly separated from the surface of the object, and the rapid, efficient, safe and energy-saving cleaning effect is achieved.
When the existing dry ice cleaning mode is used for cleaning, water vapor and impurities in the air can be mixed into the position where cleaning is finished, on one hand, the impurities can cause secondary pollution to the cleaned surface, on the other hand, because the temperature of the position after cleaning is lower, condensed water is easily formed with water vapor in the air, particularly, during and after cleaning of an optical lens, a precision die and a circuit element, water vapor can be generated on the surface of a product, dust, impurities and the like are easily adsorbed, secondary pollution is caused, and the cleaning effect of the product is affected.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a dry ice cleaning nozzle, a dry ice cleaning machine and a dry ice cleaning method for preventing secondary pollution, wherein a cleaning area is isolated from the outside through a protective air curtain, so that the cleaned surface is protected.
The aim of the invention is achieved by the following technical scheme:
dry ice cleaning nozzle comprising
The nozzle body is provided with a structure connected with the dry ice conveying pipe and a dry ice airflow spraying channel;
the air curtain nozzle is arranged on the periphery of the nozzle body in a surrounding mode, comprises an inner cavity arranged on the periphery of the nozzle body in a surrounding mode and a connecting port communicated with the inner cavity and used for connecting a protection air source through a protection air pipe, and the air curtain nozzle forms a protection air curtain arranged on the periphery of the dry ice jet flow ejected by the nozzle body in a surrounding mode.
Preferably, in the dry ice cleaning nozzle, the dry ice air flow spraying channel comprises a pipe connecting section and an accelerating spraying section which are communicated, the size of the inlet end of the pipe connecting section is larger than the size of the common end of the pipe connecting section and the accelerating spraying section, and the size of the common end of the accelerating spraying section and the pipe connecting section is smaller than the size of the outlet end of the accelerating spraying section.
Preferably, in the dry ice cleaning nozzle, a distance from an outlet end of the nozzle body to a surface to be cleaned is greater than a distance from an outlet end of the air curtain nozzle to the surface of the object to be cleaned.
Preferably, in the dry ice cleaning nozzle, the nozzle body is detachably disposed in a central hole of the air curtain nozzle.
Preferably, in the dry ice cleaning nozzle, the protection gas source is a heated and purified dry clean gas.
A dry ice cleaning machine comprising any one of the dry ice cleaning nozzles described above.
Preferably, in the dry ice cleaning machine, the nozzle body is connected with the dry ice gas mixer through a dry ice conveying pipe, the dry ice gas mixer comprises a rotating shaft capable of rotating, a groove is formed in the circumferential surface of the rotating shaft, an upper feeding block and a lower mixing cavity which are attached to the circumferential surface of the rotating shaft are arranged on the periphery of the circumferential surface of the rotating shaft, the upper feeding block is provided with a feeding hole which can be communicated with the groove, the lower mixing cavity is provided with a particle gas mixing cavity which can be communicated with the groove, the lower mixing cavity is arranged in a base, and the base is provided with an air inlet and an air outlet which are communicated with the particle gas mixing cavity.
Preferably, in the dry ice cleaning machine, the lower mixing cavity comprises a lower discharge block and a floating block, the lower discharge block is provided with a channel which is communicated with the groove and the inner groove of the floating block, the air inlet and the air outlet are communicated with the floating inner groove, the channel comprises at least two through holes positioned at the bottom of the discharge block, the through holes are different in width, and the through holes with larger width are close to the air inlet.
Preferably, in the dry ice cleaning machine, a guide plate is disposed in the inner groove of the slider, the top surface of the guide plate is opposite to the bottom surface of the partition portion of the two through holes of the discharging block, and the two side surfaces of the guide plate and the bottom surfaces of the inner grooves on the two sides of the guide plate respectively form a cambered surface or a curved surface which continuously rises from the air inlet to the air outlet and a cambered surface or a curved surface which continuously falls from the air inlet to the air outlet.
Preferably, in the dry ice cleaning machine, an air inlet hole extending to a first side wall of the slider is formed at an inner wall of the air inlet, and an air outlet hole extending to a second side wall of the slider is formed at an inner wall of the air outlet; an air inlet notch communicated with the air inlet hole is formed at the first lower top angle of the floating block, and an air outlet notch communicated with the air outlet hole is formed at the second lower top angle of the floating block.
The dry ice cleaning method for preventing secondary pollution comprises the following steps:
s1, providing any dry ice cleaning machine;
s2, supplying protective gas to form a protective gas curtain, and aligning the protective gas curtain with the surface to be cleaned;
s3, forming dry ice jet flow to clean the surface to be cleaned;
and S4, stopping dry ice jet flow after cleaning is completed, keeping the protective air curtain open until the cleaned surface is dried and returning to the room temperature.
The technical scheme of the invention has the advantages that:
this scheme design is exquisite, simple structure, through set up the protective gas curtain by shielding gas formation at dry ice efflux periphery, can effectually separate the cleaning surface with external air, avoid impurity, pollutant such as vapor and cleaning surface contact's problem, simultaneously, in operation, sweep through the protective gas curtain to the surface after wasing, on the one hand can dry the surface after wasing, accelerate it and resume the room temperature, solve the problem that vapor condensation foggy, on the other hand, can protect at the overall in-process that resumes the room temperature, thereby guarantee the cleaning performance.
According to the design of the dry ice airflow spraying channel, the flow of airflow can be accelerated by utilizing the characteristics of the structure, and the moving power of dry ice particles is improved, so that the cleaning efficiency is improved, meanwhile, due to the design that the tail end of the nozzle main body is positioned in the air curtain nozzle, the nozzle main body can obtain the optimal cleaning coverage area and power, and the perfect unification of the two can be realized.
The dry and clean gas is used as the protective gas, so that the secondary pollution source can be avoided being brought into on one hand, and on the other hand, the condensed water can be removed conveniently, and meanwhile, the cleaned product surface can be accelerated to restore to the room temperature, and the condensed water in the air is prevented from being condensed to the product surface again.
According to the dry ice gas mixer, the autorotation rotating shaft is arranged to be matched with the upper feeding block and the lower mixing cavity, so that continuous and effective supply of dry ice powder can be realized by utilizing the principle that dry ice powder falls under gravity; meanwhile, due to the design of the particle gas mixing cavity, dry ice particles and high-pressure air can be effectively mixed, so that the dry ice particles in the air flow are uniformly distributed, and the final cleaning efficiency and effect are improved; and the floatable structure of the lower mixing cavity effectively compensates gaps generated by abrasion among parts, and reduces the risk of leakage of dry ice particles and high-pressure gas.
The design of the last feeding piece of dry ice gas blender of this scheme has effectually guaranteed the efficiency of feed, and the effectual contact surface that has reduced between last feeding piece and the pivot simultaneously has effectually reduced wearing and tearing, has reduced the risk that wearing and tearing clearance was revealed, and the downshift design of last feeding piece also can compensate the clearance between it and the pivot when necessary in addition, further reduces the possibility of revealing.
The particle gas mixing cavity and the feeding through hole of the dry ice gas mixer are designed in size, space and precondition are effectively provided for the diffusion and suspension of dry ice particles in the cavity, so that the uniform diffusion of the dry ice particles in the air flow and the movement along with the air flow are effectively carried out, and the cleaning efficiency and effect are guaranteed; meanwhile, due to the design of the inner cavity, the smoothness of airflow is effectively guaranteed, and the loss of airflow power is reduced to a certain extent.
According to the design of the air hole of the floating block of the dry ice gas mixer and the notch at the bottom of the base, the existing high-pressure air can be fully utilized as a power source on the basis that parts are not additionally added, so that the lifting of the floating block is driven to be always attached to the circumferential surface of the rotating shaft, the structure is simplified, and leakage is avoided.
Drawings
FIG. 1 is a cross-sectional view of a dry ice cleaning nozzle of the present invention;
FIG. 2 is a schematic view of a nozzle body of the dry ice cleaning nozzle of the present invention;
FIG. 3 is a schematic illustration of the connection of a dry ice cleaning nozzle with a dry ice gas mixer in accordance with the present invention;
FIG. 4 is a cross-sectional view of the dry ice gas blender of the present invention;
FIG. 5 is a perspective view of the dry ice gas blender of the present invention;
FIG. 6 is a top view of the dry ice gas blender of the present invention;
FIG. 7 is a cross-sectional view of the shaft and upper feed block region of the dry ice gas blender of the present invention;
FIG. 8 is a cross-sectional view of the feed block and lower discharge block region of the dry ice gas blender of the present invention;
FIG. 9 is a perspective view of the lower discharge block of the dry ice gas blender of the present invention;
FIG. 10 is a cross-sectional view of the spindle, lower mixing chamber and base region of the dry ice gas blender of the present invention;
FIG. 11 is a top perspective view of a slider of the dry ice gas blender of the present invention;
FIG. 12 is a cross-sectional view of the lower mixing chamber and base region of the dry ice gas blender of the present invention;
FIG. 13 is a bottom perspective view of a slider of the dry ice gas blender of the present invention.
Detailed Description
The objects, advantages and features of the present invention are illustrated and explained by the following non-limiting description of preferred embodiments. These embodiments are only typical examples of the technical scheme of the invention, and all technical schemes formed by adopting equivalent substitution or equivalent transformation fall within the scope of the invention.
In the description of the embodiments, it should be noted that the positional or positional relationship indicated by the terms such as "center", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", etc. are based on the positional or positional relationship shown in the drawings, are merely for convenience of description and simplification of description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in the specific orientation, and thus are not to be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the scheme, the direction approaching the operator is the near end, and the direction separating from the operator is the far end, with reference to the operator.
The dry ice cleaning nozzle disclosed by the invention is particularly suitable for cleaning products with high cleanliness requirements such as optical lenses, precision molds, circuit elements and the like, and can be used for cleaning other products with relatively low cleanliness requirements.
As shown in FIG. 1, the dry ice cleaning nozzle comprises
A nozzle body 10 having a structure to be connected to the dry ice transfer pipe 20 and a dry ice air flow blasting passage 101;
the air curtain nozzle 30 is arranged around the outer periphery of the nozzle body 10, and comprises an inner cavity 301 arranged around the outer periphery of the nozzle body 10 and a connecting port 302 communicated with the inner cavity 301 and used for connecting a protection air source through the protection air pipe 40, and the air curtain nozzle 30 forms a protection air curtain 60 arranged around the outer periphery of the dry ice jet 50 ejected by the nozzle body 10.
Due to the existence of the protective air curtain 60, the surface after cleaning can be effectively isolated from the external air, so that the problem that the external air is in cold contact with the surface after cleaning for liquefying, dust and pollution particles are easy to adsorb is avoided, and secondary pollution after dry ice cleaning is effectively avoided.
As shown in fig. 2, the dry ice air flow spraying channel 101 includes a pipe connection section 1011 and an accelerating spraying section 1012 which are connected, wherein the pipe connection section 1011 and the accelerating spraying section 1012 may be flat hole sections or frustum-shaped, such as a frustum of a cone or a frustum of a square cone, preferably, the size of the inlet end of the pipe connection section 1011 is larger than the size of the common end of the pipe connection section 1011 and the accelerating spraying section 1012, and the size of the common end of the accelerating spraying section 1012 and the pipe connection section 1011 is smaller than the size of the outlet end of the accelerating spraying section 1012.
The structural design has the advantages that: when the air flow carrying the dry ice enters the pipe connection section 1011, the size of the pipe connection section 1011 is gradually reduced, so that the pressure of the air flow is gradually increased, and therefore, when the air flow enters the accelerating spraying section 1012, the air flow is accelerated under the action of larger air pressure, and the spraying rate of the dry ice particles is further improved.
In addition, since the accelerating spraying section 1012 is tapered, the dry ice jet 50 formed by the accelerating spraying section is also tapered, and the covering area is larger as the distance from the surface 70 to be cleaned is larger, for example, the outlet end 102 of the nozzle body 10 is flush with the outlet end 304 of the air curtain nozzle 30, and at this time, the covering area is relatively smaller, so that the distance from the outlet end 102 of the nozzle body 10 to the surface 70 to be cleaned is larger than the distance from the outlet end 304 of the air curtain nozzle 30 to the surface of the object to be cleaned, as shown in fig. 1.
Meanwhile, in order to facilitate the assembly of the nozzle body 10 and the protective air curtain nozzle 30, as shown in fig. 1, the nozzle body 10 is detachably disposed in a central hole 303 of the air curtain nozzle 30, for example, the central hole 303 is a screw hole, and the side surface of the nozzle body 10 is provided with threads, so that the nozzle body 10 and the central hole can be screwed together, and of course, the nozzle body 10 and the protective air curtain nozzle can be assembled together by interference fit, or glued together or welded together, or even, they can be integrally injection molded.
Further, in order to avoid secondary pollution caused by the protection gas source, the protection gas source is preferably purified gas, the gas can be nitrogen, inert gas without environmental pollution, and the like, preferably purified air, and the purification of the air is a known technology and is not described in detail; meanwhile, in order to avoid condensation after the water vapor and the like possibly carried in the protective gas are contacted with the surface which is colder after cleaning, the protective gas is heated and dried, so that the water vapor is prevented from being carried on one hand, and the surface after cleaning can be quickly restored to the room temperature state on the other hand.
In another embodiment of the present disclosure, a dry ice cleaning machine includes the dry ice cleaning nozzle, as shown in fig. 3, a nozzle body 10 of the dry ice cleaning nozzle is connected to a dry ice gas mixer 80 through a dry ice conveying pipe 20, a dry ice block supplying device (not shown in the drawing) and an ice crushing device (not shown in the drawing) are disposed above the dry ice gas mixer 80, dry ice powder crushed by the ice crushing device is connected to a feeding hole 21 of the dry ice gas mixer 80 through a conveying channel (not shown in the drawing), a rotating shaft of the dry ice gas mixer 80 is connected to a power device (not shown in the drawing) for driving the dry ice gas mixer 80 to rotate, an air inlet 51 of the dry ice gas mixer 80 is connected to a high pressure air source (not shown in the drawing), and an air outlet 52 is connected to the dry ice cleaning nozzle through the dry ice conveying pipe 20.
The dry ice block supplying device, the ice crushing device and the conveying channel are known technologies, and are not described in detail, but the dry ice conveying pipe 20 can be a hose, a hard plastic pipe or a metal pipe, preferably a flexible pipe, so that the nozzle can be conveniently arranged upwards to adapt to the inclination of the positions of a corner, the top surface of a cavity and the like.
The dry ice gas mixer 80, as shown in fig. 4 and fig. 5, comprises a rotatable rotating shaft 1, a groove 11 is formed on the circumferential surface of the rotating shaft 1, an upper feeding block 2 and a lower mixing cavity 34a, which are attached to the circumferential surface of the rotating shaft 1, are arranged on the circumferential surface periphery of the upper feeding block 2, a feeding hole 21 communicated with the groove is formed in the upper feeding block 2, a particle gas mixing cavity 34b capable of being communicated with the groove 11 is formed in the lower mixing cavity 34a, the lower mixing cavity 34a is arranged in a base 5, and is attached to the circumferential surface of the rotating shaft under the action of upward thrust, and the base 5 is provided with an air inlet 51 and an air outlet 52 which are communicated with the particle gas mixing cavity 34 b.
When the dry ice powder mixing device is used, dry ice particles fall into the groove 11 of the rotating shaft from the feeding hole 21, and the groove 11 is communicated with the lower mixing cavity after autorotation, so that the dry ice particles in the groove 11 fall into the particle gas mixing cavity 34b under the action of self gravity and are discharged from the air outlet 52 under the action of high-pressure air flow, thereby conveniently realizing the supply of dry ice powder, ensuring the mixing of high-pressure air and dry ice particles and ensuring the power of the air flow.
In addition, the lower mixing cavity is pushed upwards, so that the upward movement of the lower mixing cavity can compensate the abrasion between the lower mixing cavity and the contact surface of the rotating shaft, and the circumferential surface of the lower mixing cavity and the rotating shaft 1 can be always kept in fit, and the problem of leakage can be effectively prevented when high-pressure gas and tiny dry ice particles enter between the contact surfaces of the lower mixing cavity and the rotating shaft 1.
In detail, as shown in fig. 5, the rotating shaft 1 is rotatably mounted on two support plates 6, the two support plates 6 are fixed on a bottom plate 7, a bearing 8 is fixed on each support plate 6, the rotating shaft 1 is inserted into the inner rings of the two bearings 8 so as to be capable of rotating, and in actual use, one end of the rotating shaft 1 is connected with a power source, such as a motor or a motor+transmission mechanism, so as to drive the rotating shaft 1 to rotate.
The number of the grooves 11 on the rotating shaft 1 may be set according to the need, and the shape of the grooves 11 may be various feasible shapes, for example, it may be a set of cuboid, hemispherical, or ellipsoidal, preferably, as shown in fig. 6, the grooves 11 are three circles 111, 112, 113, each circle includes a set of grooves that uniformly divide the circumferential surface of the rotating shaft 1, the size of the grooves gradually decreases from the open end to the inside, so as to form a shape similar to an inverted frustum, and any groove of any circle and any groove of another circle are arranged in a staggered manner, so that dry ice powder uniformly enters into the particle air mixing cavity in a distributed manner.
The upper feeding block 2 is disposed between the two supporting plates 6, and as shown in fig. 5 and fig. 6, the upper feeding block 7 may be fixedly connected with the two supporting plates 6 by bolts, at this time, the position of the upper feeding block 2 is fixed, however, as the device is used for a long time, the contact surfaces of the upper feeding block 2 and the rotating shaft 1 may generate a certain gap due to abrasion between them, at this time, during the rotation process of the rotating shaft 1, dry ice powder may enter into the gap of the contact surfaces, so that the supply amount of dry ice powder is reduced, and on the other hand, the abrasion of the contact surfaces of dry ice powder may be further increased, resulting in aggravation of the abrasion problem.
Therefore, in an alternative embodiment, the position of the upper feeding block 2 is not fixed on the supporting plates 6, for example, the upper feeding block 2 can be clamped between the two supporting plates 6 in a manner of sliding up and down relative to the two supporting plates 6, that is, guide grooves or guide convex strips (not shown in the figure) are formed on two sides of the upper feeding block, and structures (sanitary porcelain in the figure) matched with the guide grooves or the guide convex strips are formed on the inner surface of the supporting plates 6, so that when the contact surface of the upper feeding block 2 and the rotating shaft is worn, the upper feeding block 2 can move downwards under the action of pressure to keep fit with the circumferential surface of the rotating shaft 1 all the time.
Of course, in other embodiments, it is also possible to use other means to make the upper feeding block 2 have a certain downward movement space, for example, the outer circumference of a bolt or a pin (not shown in the figure) connected to the support plate 6 of the upper feeding block 2 is sleeved with an elastic ring (not shown in the figure), so that the elastic ring is deformed by the downward pressure applied to the upper feeding block 2, and thus the upper feeding block 2 can be slightly moved to compensate for the gap generated by the abrasion.
Meanwhile, in order to improve the feeding efficiency of the dry ice powder, as shown in fig. 6 and fig. 7, the radian r1 of the circumferential surface of the rotating shaft corresponding to the discharge end of the feeding hole 21 of the upper feeding block 2 is not smaller than the radian r2 of the circumferential surface of the rotating shaft corresponding to the long sides of the distal ends of the adjacent two grooves 11, and the discharge end of the feeding hole 21 can simultaneously fill at least one of the grooves 11 in each circle, so that the feeding hole 21 on the upper feeding block 2 can simultaneously add dry ice powder to a plurality of grooves 11.
In addition, during the rotation of the rotating shaft 1, the recess 11 on the rotating shaft 1 passes through the channel 31 on the lower mixing cavity 34a to realize the blanking, so when the recess 11 rotates to a position, the upper feeding block and the circumferential surface of the rotating shaft 1 do not need to be kept in a closed state, and therefore, as shown in fig. 8, preferably, the distances from the tail ends 22 and 23 of the two sides where the upper feeding block 2 is attached to the rotating shaft 1 to the upper end surface 32 of the lower mixing cavity 3 are different, so that the contact area between the upper feeding block 2 and the rotating shaft 1 can be reduced to reduce the abrasion.
The lower mixing chamber 34a may be integrally injection molded or separately assembled, and preferably is assembled in a separate manner for facilitating the processing and manufacturing of the workpiece due to its relatively complex internal structure.
In detail, as shown in fig. 4, the lower mixing cavity 34a includes a lower discharge block 3 and a slider 4, and the lower discharge block 3 and the slider 4 may be assembled together by screwing, or may be assembled together by welding or riveting or mortise and tenon joint or gluing, which are not described in detail in the prior art.
As shown in fig. 9 and 10, the lower discharging block 3 is an approximately rectangular member, the lower end surface of the member is of an open structure, and the interior of the member is a cavity 33, the upper surface of the member is provided with an arc-shaped groove 34, preferably a hemispherical groove, with the same curvature of the rotating shaft surface of the rotating shaft 1, the groove bottom surface 341 of the arc-shaped groove 34 is attached to the circumferential surface 12 of the rotating shaft 1, a channel 31 for communicating the groove 11 on the rotating shaft 1 with the inner groove 41 of the slider 4 is formed at the groove bottom of the arc-shaped groove, the channel 31 comprises at least two, preferably two rows of through holes, each row of through holes has two through holes, the distance between the distal ends of the two through holes is close to the distal ends of the two outer circles of the groove, and the width of the through holes 311,312 of each row is different, preferably the width of the through hole 311 near the air inlet 51 is greater than the width of the through hole 312 near the air outlet 52, and the reason for this design will be described later.
As shown in fig. 4, the opening end surface of the lower discharging block 3 faces the floating block, they cooperate to form the particle gas mixing cavity 34b, as shown in fig. 10 and 11, the floating block 4 is a rectangular member with a round angle, the middle area of the upper surface of the member forms the inner groove 41, notches 46 and 47 respectively communicated with the inner groove 41 are formed at two opposite side plates of the member, the notches 46 are butted with the air inlet 51, the notches 47 are butted with the air outlet 52, a groove 48 is formed at the bottom of the floating block 4, and thus, when the floating block is mounted on the base 5, a boss 56 at the bottom of a positioning groove 55 of the base 5 is embedded in the groove 48.
Further, in order to facilitate that the dry ice powder is uniformly dispersed in a sufficient space and time after entering the particle gas mixing chamber 34b, as shown in fig. 10 and 11, a baffle plate 42 is disposed in the inner groove 41 of the slider 4, a top surface 421 of the baffle plate 42 is opposite to a bottom surface of the partition 35 of the two through holes of the discharging block 3, and preferably the top surface 421 of the baffle plate 42 is attached to the bottom surface of the partition 35, so that the baffle plate 42 cooperates with the partition to divide the particle gas mixing chamber 34b into two chambers 34b1 and 34b2, which are respectively communicated with the through holes 311 and 312.
Therefore, when the groove 11 rotates to be opposite to the through holes 311 and 312 of the quick discharging material 3, most of dry ice powder in the groove 11 falls into the cavity 34b1 under the action of self weight due to the large through hole 311, and at the same time, high-pressure gas can exert upward acting force on descending dry ice particles when entering the cavity 34b1 from the gas inlet 51, so that most of dry ice powder is dispersed and suspended in the cavity 34b1, a large amount of dry ice particles are uniformly dispersed in the gas flow, and meanwhile, the gas flow carries the dry ice particles suspended in the gas flow to enter the cavity 34b2 at the other side from the through holes 311, the groove 11 and the through hole 312, and is sprayed out from the gas outlet 52; a small portion of the dry ice powder enters the chamber 34b2 through the through hole 312, and is diffused in the chamber 34b2 by the blowing of the air flow and carried by the air flow to be ejected from the air outlet 52, and in this process, dry ice particles can be sufficiently uniformly diffused in the air flow.
Meanwhile, in order to reduce the power loss caused by the resistance of the air flow directly impacting the baffle plate 42 and improve the smoothness of the flow of the high-pressure air in the particle-air mixing chamber, as shown in fig. 8, the two side surfaces 422 and 423 of the baffle plate 42 and the bottom surfaces 411 and 412 of the dividing regions of the inner groove 41 at the two sides of the baffle plate respectively form an arc surface or curved surface continuously rising from the air inlet to the air outlet and an arc surface or curved surface continuously falling from the air inlet to the air outlet, preferably a smooth surface, so that the high-pressure air can rise along the smooth surface when entering from the air inlet 51, but does not diffuse to the periphery under the barrier of the baffle plate 42 after directly impacting the baffle plate 42, thereby reducing the air flow power; in order to facilitate rapid diffusion of high-pressure air after entering the chamber 34b1 from the smaller air inlet 51, the side 413 of the divided area formed by the inner groove 41 isolated by the baffle 42 is an arc surface connected with the bottom 411 and 412, and meanwhile, the connection area between the side 413 of the divided area and the side 422 and 423 of the baffle 42 is an arc surface, so that air flow is facilitated to diffuse along a smooth surface, and air flow resistance is ensured.
The slider 4 may be fixed in the positioning groove 55 of the base 5, and of course, may also slightly move up and down relative to the base 5, so as to compensate for a gap generated when the circumferential surfaces of the lower discharging block 3 and the rotating shaft 1 are worn.
In order to enable the slider 4 to move up and down relative to the base 5, in one embodiment, the pushing force applied thereto may be generated by a spring or elastic member or the like (not shown) provided in a compressed state at the bottom of the slider 4.
In another possible embodiment, a set of air holes (not shown) located at the bottom of the slider 4 may be formed in the base 5, and a high-pressure air source may be connected to the air holes through a pipe (not shown), so that the slider 4 may have power to move upward by the jacking force of air ejected from the air holes when the apparatus is operated.
In yet another alternative embodiment, in order to simplify the structure for driving the slider 4 to move, it is preferable that, as shown in fig. 12, at the inner wall of the air inlet 51, particularly at the position where the air inlet is close to the connection with the slider 4, an air inlet 53 extending to the first side wall 42 of the slider 4 is formed, that is, the air inlet 53 is inclined toward the lower left corner, while an air outlet end 531 of the air inlet 53 is close to the bottom surface 49 of the slider 4, an air outlet 54 extending to the second side wall 43 of the slider 4 is formed at the inner wall of the air outlet 52, that is, the air outlet 54 is inclined downward and toward the right, and at the same time, an air inlet end 541 of the air outlet 54 is close to the bottom surface 49 of the slider 4, so that when high pressure air enters the particle gas mixing chamber 34b from the air inlet 51, part of the high pressure air enters into a gap between the bottom surface of the slider 4 and the bottom of the positioning groove of the base 5 through the air inlet 53 and is discharged from the other side hole 54, and the air outlet end 531 of the bottom of the slider 4 is continuously kept close to the circumference of the rotating shaft 3.
Further, in order to facilitate the high pressure gas to enter between the bottom surface of the slider 4 and the inner bottom surface of the base 5 through the gas inlet holes 43, as shown in fig. 13, an air inlet notch 44 communicating with the gas inlet holes 53 is formed at a first lower vertex angle 410 of the slider 4, and an air outlet notch 45 communicating with the gas outlet holes 54 is formed at a second lower vertex angle 420.
In actual use, the air inlet 51 is connected to a high-pressure air source (not shown in the figure), and the slider 4 is lifted under the upward pushing force generated by the air flow flowing from the bottom of the slider 4 in the distribution of the high-pressure air source, so that the lower discharging block 3 keeps fit with the circumferential surface of the rotating shaft 1.
Finally, in order to reduce wear between the contact surfaces of the rotating shaft 1 and the upper and lower feed blocks 2 and 3, they may be made of a metal material, such as stainless steel, and diamond-like coating may be deposited on their contact surfaces, or teflon coating may be applied thereto, and in yet another embodiment, they may be directly made of teflon material, so that wear resistance and self-lubrication properties of the material may be utilized to improve service life while reducing the possibility of gaps generated by wear.
The scheme further discloses a dry ice cleaning method for preventing secondary pollution, which comprises the following steps:
s1, providing a dry ice cleaning machine with the dry ice cleaning nozzle.
S2, firstly opening a protective gas supply pipeline to supply protective gas, forming a protective gas curtain by the gas curtain nozzle, and enabling the protective gas curtain to be aligned to the surface to be cleaned.
And S3, at the moment, starting a dry ice block supply device, an ice crushing device and supplying air to the high-pressure air source, wherein dry ice powder obtained by crushing the ice crushing device enters a dry ice air mixer 80 to be mixed with air flow of the high-pressure air source and enters a nozzle body 10 along with the air flow from a dry ice conveying pipe 20 to form dry ice jet flow, so that the surface to be cleaned is cleaned.
And S4, after the cleaning is finished, the nozzle body 10 stops spraying dry ice jet flow, at the moment, the protective gas curtain is kept in an open state by keeping the supply of the protective gas, and after the surface after the cleaning is finished is dried and returns to the room temperature, the supply of the protective gas is stopped, and the final cleaning is finished.
The invention has various embodiments, and all technical schemes formed by equivalent transformation or equivalent transformation fall within the protection scope of the invention.
Claims (6)
1. Dry ice cleaning machine, its characterized in that: comprising a dry ice cleaning nozzle comprising:
a nozzle body (10) having a structure for connecting the dry ice delivery pipe (20) and a dry ice air flow blasting passage (101);
the air curtain nozzle (30) is arranged around the periphery of the nozzle main body (10) and comprises an inner cavity (301) arranged around the periphery of the nozzle main body (10) and a connecting port (302) communicated with the inner cavity (301) and used for connecting a protective air source through a protective air pipe (40), and the air curtain nozzle (30) forms a protective air curtain (60) arranged around the periphery of a dry ice jet flow (50) ejected by the nozzle main body (10);
the dry ice mixing device comprises a nozzle body (10), and is characterized in that the nozzle body (10) is connected with a dry ice gas mixer (80) through a dry ice conveying pipe (20), the dry ice gas mixer (80) comprises a rotating shaft (1) capable of rotating, a groove (11) is formed in the circumferential surface of the rotating shaft (1), an upper feeding block (2) and a lower mixing cavity (34 a) which are attached to the circumferential surface of the rotating shaft (1) are arranged on the periphery of the circumferential surface of the rotating shaft, the upper feeding block (2) is provided with a feeding hole (21) which can be communicated with the groove, the lower mixing cavity (34 a) is provided with a particle gas mixing cavity (34 b) which can be communicated with the groove (11), the lower mixing cavity (34 a) is arranged in a base (5), and the base (5) is provided with an air inlet (51) and an air outlet (52) which are communicated with the particle gas mixing cavity (34 b);
the lower mixing cavity comprises a lower discharge block (3) and a floating block (4), the opening end face of the lower discharge block (3) faces the floating block, and the lower discharge block (3) and the floating block (4) are matched to form the particle gas mixing cavity (34 b);
the lower discharging block (3) is provided with a channel (31) which is communicated with the groove (11) and the inner groove (41) of the floating block (4), the air inlet (51) and the air outlet (52) are communicated with the inner groove (41) of the floating block (4), the channel (31) comprises at least two through holes which are positioned at the bottom of the discharging block (3), the through holes are different in width, and the through holes with larger width are close to the air inlet;
an air inlet hole (53) extending to a first side wall of the floating block (4) is formed at the inner wall of the air inlet (51), and an air outlet hole (54) extending to a second side wall of the floating block (4) is formed at the inner wall of the air outlet (52); an air inlet gap (44) communicated with the air inlet hole (53) is formed at the first lower vertex angle (410) of the floating block, and an air outlet gap (45) communicated with the air outlet hole (54) is formed at the second lower vertex angle (420) of the floating block;
the inner groove (41) of the floating block (4) is provided with a guide plate (42), the top surface (421) of the guide plate (42) is opposite to the bottom surface of the partition part (35) of the two through holes of the discharging block (3), and the two side surfaces (422, 423) of the guide plate (42) and the bottom surfaces (411, 412) of the inner groove (41) at the two sides of the guide plate respectively form a curved surface which continuously rises from the air inlet to the air outlet and a curved surface which continuously descends from the air inlet to the air outlet.
2. A dry ice cleaning machine as claimed in claim 1, wherein: the dry ice airflow spraying channel (101) comprises a pipe connecting section (1011) and an accelerating spraying section (1012) which are communicated, the size of the inlet end of the pipe connecting section (1011) is larger than the size of the common end of the pipe connecting section and the accelerating spraying section (1012), and the size of the common end of the accelerating spraying section (1012) and the pipe connecting section (1011) is smaller than the size of the outlet end of the accelerating spraying section (1012).
3. A dry ice cleaning machine as claimed in claim 2, wherein: the distance from the outlet end of the nozzle main body (10) to the surface to be cleaned is larger than the distance from the outlet end of the air curtain nozzle (30) to the surface of the object to be cleaned.
4. A dry ice cleaning machine as claimed in claim 1, wherein: the nozzle body (10) is detachably disposed in a central hole (303) of the air curtain nozzle (30).
5. A dry ice cleaning machine as claimed in claim 1, wherein: the protection gas source is a heated and purified dry clean gas.
6. The dry ice cleaning method for preventing secondary pollution is characterized by comprising the following steps of: the method comprises the following steps:
s1, providing the dry ice cleaning machine according to any one of claims 1-5;
s2, supplying protective gas to form a protective gas curtain, and aligning the protective gas curtain with the surface to be cleaned;
s3, forming dry ice jet flow to clean the surface to be cleaned;
and S4, stopping dry ice jet flow after cleaning is completed, keeping the protective air curtain open until the cleaned surface is dried and returning to the room temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910634725.9A CN110369403B (en) | 2019-07-15 | 2019-07-15 | Dry ice cleaning nozzle, dry ice cleaning machine and secondary pollution prevention dry ice cleaning method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910634725.9A CN110369403B (en) | 2019-07-15 | 2019-07-15 | Dry ice cleaning nozzle, dry ice cleaning machine and secondary pollution prevention dry ice cleaning method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110369403A CN110369403A (en) | 2019-10-25 |
| CN110369403B true CN110369403B (en) | 2024-02-13 |
Family
ID=68253097
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910634725.9A Active CN110369403B (en) | 2019-07-15 | 2019-07-15 | Dry ice cleaning nozzle, dry ice cleaning machine and secondary pollution prevention dry ice cleaning method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110369403B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111493782A (en) * | 2020-04-27 | 2020-08-07 | 深圳市中安动力科技有限公司 | Multifunctional tableware rapid spraying and washing device |
| CN111570413A (en) * | 2020-05-21 | 2020-08-25 | 镭射谷科技（深圳）股份有限公司 | Dry ice crusher and dry ice processing system who constitutes thereof |
| CN111922779A (en) * | 2020-09-14 | 2020-11-13 | 哈尔滨理工大学 | Low-temperature micro-lubricating double-nozzle device suitable for cutting SiCp/Al composite material |
| CN113457869B (en) * | 2021-09-01 | 2021-11-16 | 苏州好博医疗器械股份有限公司 | Spray head protection device of steam injection equipment |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001259555A (en) * | 2000-03-17 | 2001-09-25 | Nippon Sanso Corp | Dry ice snow-cleaning method and apparatus using the same |
| CN102335879A (en) * | 2011-09-30 | 2012-02-01 | 电子科技大学 | Dry ice particle spray rinsing device and use method thereof |
| CN203526146U (en) * | 2013-10-15 | 2014-04-09 | 迪普干冰制造(大连)有限公司 | Powder dry ice cleaning gun |
| TW201822906A (en) * | 2016-12-20 | 2018-07-01 | 冷研科技有限公司 | Dry ice cleaning device with dust collection capable of achieving dual purposed of applying dry ice cleaning and sucking dust and hazardous matter in air in one machine |
| CN109277220A (en) * | 2018-10-31 | 2019-01-29 | 厦门理工学院 | It is a kind of with the Dry ice cleaning nozzle for stablizing dry ice and flowing to function |
| CN109318133A (en) * | 2018-10-31 | 2019-02-12 | 儒众智能科技（苏州）有限公司 | A kind of liquid nitrogen and dry ice mixing deburring nozzle |
| CN208679490U (en) * | 2018-05-30 | 2019-04-02 | 机械工业第四设计研究院有限公司 | A kind of Dry ice cleaning nozzle with deflector |
| CN208787099U (en) * | 2018-05-31 | 2019-04-26 | 郓城万通干冰设备自动化有限公司 | A kind of ingredient sector and its dry ice cleaner |
| CN210647553U (en) * | 2019-07-15 | 2020-06-02 | 儒众智能科技（苏州）有限公司 | Dry ice cleaning nozzle and dry ice cleaning machine |
-
2019
- 2019-07-15 CN CN201910634725.9A patent/CN110369403B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001259555A (en) * | 2000-03-17 | 2001-09-25 | Nippon Sanso Corp | Dry ice snow-cleaning method and apparatus using the same |
| CN102335879A (en) * | 2011-09-30 | 2012-02-01 | 电子科技大学 | Dry ice particle spray rinsing device and use method thereof |
| CN203526146U (en) * | 2013-10-15 | 2014-04-09 | 迪普干冰制造(大连)有限公司 | Powder dry ice cleaning gun |
| TW201822906A (en) * | 2016-12-20 | 2018-07-01 | 冷研科技有限公司 | Dry ice cleaning device with dust collection capable of achieving dual purposed of applying dry ice cleaning and sucking dust and hazardous matter in air in one machine |
| CN208679490U (en) * | 2018-05-30 | 2019-04-02 | 机械工业第四设计研究院有限公司 | A kind of Dry ice cleaning nozzle with deflector |
| CN208787099U (en) * | 2018-05-31 | 2019-04-26 | 郓城万通干冰设备自动化有限公司 | A kind of ingredient sector and its dry ice cleaner |
| CN109277220A (en) * | 2018-10-31 | 2019-01-29 | 厦门理工学院 | It is a kind of with the Dry ice cleaning nozzle for stablizing dry ice and flowing to function |
| CN109318133A (en) * | 2018-10-31 | 2019-02-12 | 儒众智能科技（苏州）有限公司 | A kind of liquid nitrogen and dry ice mixing deburring nozzle |
| CN210647553U (en) * | 2019-07-15 | 2020-06-02 | 儒众智能科技（苏州）有限公司 | Dry ice cleaning nozzle and dry ice cleaning machine |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110369403A (en) | 2019-10-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110369403B (en) | Dry ice cleaning nozzle, dry ice cleaning machine and secondary pollution prevention dry ice cleaning method | |
| RU2754055C2 (en) | Particle blower | |
| US5383975A (en) | Arrangement for cleaning of pipelines | |
| EP0633828B1 (en) | Nozzle of a sand blaster for dust-free blasting of plain surfaces | |
| KR20160111344A (en) | Flat jet nozzle, and use of a flat jet nozzle | |
| US5655853A (en) | Vertical-shaft airlock | |
| US5263504A (en) | Apparatus and method for cleaning with a focused fluid stream | |
| CN210647553U (en) | Dry ice cleaning nozzle and dry ice cleaning machine | |
| CN113798936B (en) | Bearing ring arrangement device with error-proof mechanism and arrangement method | |
| US7053335B2 (en) | Method and device for cleaning welding torches | |
| KR20210029672A (en) | Air nozzle | |
| US3111389A (en) | Apparatus for preparing polyurethane foam compositions and the like | |
| CN115870057A (en) | Centrifugal grinding mechanism and grinding device | |
| CZ232096A3 (en) | Device with counter-rotating rotors for coal/mineral pulverizer | |
| WO2022181666A1 (en) | Air nozzle | |
| CN210647552U (en) | Solid particle and gas mixer and dry ice cleaning machine | |
| JP3619598B2 (en) | Apparatus and method for sandblasting the inner wall of a workpiece | |
| CN214652084U (en) | Automatic cleaning mechanism of bearing ring | |
| CN112108992B (en) | Ceramic small part batch grinding device | |
| TWM498632U (en) | Dry ice clean device | |
| JP6979248B1 (en) | Air nozzle | |
| CA3125952A1 (en) | Abrasive blast treatment machine for surfaces of large-scale workpieces | |
| CN209918488U (en) | Novel seal structure and dry ice cleaning machine | |
| CN220296660U (en) | Flour milling production line for tube base | |
| RU2813440C1 (en) | Device and method for feeding loose solid cryogenic substance into compressed air flow |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |