RU2830542C2 - Device for controlling size of dry ice granules and their dosing for device for mixing solid particles of dry ice with flow of gaseous medium - Google Patents

Abstract

FIELD: various technological processes.

SUBSTANCE: invention relates to a device for controlling the size of dry ice granules and their dosing for a device for mixing solid particles of dry ice with a flow of a gaseous medium. Device for controlling the size of dry ice granules and dosing them for a device for mixing solid particles of dry ice with a flow of a gaseous medium comprises a housing having a section for feeding granules and a section for removing granules, between which there is a rotary element for transporting granules from the granules inlet section to the granules outlet section. At that, in the housing parallel to each other there are at least two rotary feeding elements, and between the said rotary feeding elements there is a cutting element. At the same time the feeding elements are brought into rotation with provision of their rotation in opposite directions relative to the direction of granules passage from the granules inlet section to the granules output section.

EFFECT: simplified design of the device, reduced power consumption.

2 cl, 11 dwg

Description

AREA OF TECHNOLOGY

[0001] The invention relates to a device for regulating the size of dry ice granules and dosing them for a device for mixing solid dry ice particles with a flow of a gaseous medium.

PREREQUISITES

[0002] When operating dry ice cleaning machines that use granulated solid carbon dioxide ( _CO2 ), commonly known as dry ice, there is often a reduction or complete cessation of the flow of particles from the container to the mixing system due to the tendency of the dry ice particles to stick together. Such stuck lumps of dry ice can reach large sizes, forming in the container of the equipment that is designed to store dry ice. The mixing system in this case is understood to be the part of the machine where the dry ice particles are mixed with a flow of a gaseous medium, usually a flow of air, after which the flow of dry ice particles is fed to a jet gun.

[0003] Dry ice particles may stick together for a number of reasons, such as production technology, deterioration of quality characteristics over time, improper storage, operating conditions, etc. Also, during conventional production of dry ice pellets, cylindrical particles are usually formed, the axial length of which is several times greater than the diameter of the particle, so that, for example, for pellets with a diameter of 3 mm, their length is usually from 12 mm to 15 mm. Subsequently, such a particle shape has a negative effect on the quality or stability of the supply of pellets to mixing systems. In the prior art, various systems are known that prevent clogging of the loading openings of devices, or transfer rollers intended for removing pellets from a container.

[0004] Irregular feed, also known as pulsating feed, is also a common problem for mixing systems working with dry ice pellets, which is most pronounced at low pellet flow rates. This pulsation is caused by the rotation of the mixing element and its shaped parts. These rotating mixing elements contain individual chambers or pockets filled with pellets, from which the pellets are then moved by an air flow. These rotating mixing elements, known in the art, have a disk or cylindrical shape.

[0005] The above problems are partially solved by the device described in published application US 2019/0321942 A1, wherein the blasting device comprises a metering part, a grinder and a feed part. Both the metering part and the grinder can be configured to ensure uniform discharge of particles. The metering part regulates the feed rate of the particles and can comprise a rotor that can have V-shaped or angular pockets. The grinder comprises at least one roller that can move between a position in which the grinder is located at a maximum width of the discharge gap and a position in which said width is minimum, and including these positions. In the absence of a grinder, the metering part can direct the discharged product to the feed part. In the absence of a metering part, particles can be fed to the grinder directly from a source of the blasting medium.

[0006] The device according to the said document contains only one rotating roller, located in the dosing part and rotating in one direction relative to the sweeping edge made on the body of the said part. This rotating roller has grooves, pockets with an angular, V-shaped, U-shaped cross-section, which extend from both ends of the roller along its length, converging in the center of the cylinder at the top facing in the direction opposite to the direction of rotation of the roller.

[0007] This configuration ensures that the granules located in the grooves move toward the axial center of the grooves, ensuring a more uniform distribution of the granules along the length of the roller. In this case, the said sweeping edge prevents the granules from being pushed into the grooves. Forcibly pushing the granules would lead to their sticking together in the grooves and, at the subsequent stages of the device's operation, could lead to a possible retention of the granules in the said grooves and an undesirable accidental and unplanned loss of granules, or to the formation of lumps of granules. In this way, the amount of granules fed into the mixing system is regulated by a metering device, and not by the feeding or mixing device itself. In this case, the feeding or mixing devices can continuously operate in a speed range that does not cause pulsation of the flow of dry ice particles, while the amount of dry ice particles can be small, which would otherwise cause said pulsation due to the low speed of the feeding element of this mixing device.

[0008] As mentioned above, dry ice often forms in the dry ice container in the form of lumps, which, due to their size, cannot pass, for example, through the roller of the dosing device described above. Therefore, due to the formation of these lumps, other additional devices are also used that break up the lumps mechanically. However, such additional devices ultimately complicate the device, and also increase its energy consumption.

[0009] The aim of the present invention is to eliminate the disadvantages of the prior art.

DESCRIPTION OF THE INVENTION

[0010] The said object is achieved by creating a device according to the present invention for regulating the size of dry ice granules and dosing them for a device for mixing solid dry ice particles with a flow of a gaseous medium, wherein the proposed device comprises a housing having a granule input section and a granule output section, between which a rotary element is located for transporting granules from the granule input section to the granule output section. The device according to the invention is characterized in that at least two rotary feed elements are located in the housing, mounted parallel to each other, wherein a cutting element is located between said elements. The feed elements are set in rotational motion with the provision of their rotation towards each other relative to the direction of passage of granules from the granule input section to the granule output section. The rotary feed elements are made in the form of rotary rollers having recesses for transporting granules, located along the circumference of the rollers. These recesses are oriented in the axial direction of the feed element and are located sequentially in at least two rows along the length of the roll of the feed element, wherein each of the two adjacent rows of recesses for transporting granules is offset relative to the other row. Between the rotary feed elements there is a cutting element having at least one cutting edge at each roller. The position of the cutting edges relative to the rollers is in the range below the level of the line connecting the rotation axes of the feed elements, including the position of the cutting edges at the level of this line. The angle between the line connecting the rotation axes of the feed elements and the surface of the cutting element is in the range from 0° to 45°. Between the roller and the cutting edge there is a gap, the size of which is less than the minimum size of the granules to be transported.

[0011] Preferably, a device for crushing dry ice granules is connected to the device for regulating the size of dry ice granules and dosing them, namely, to its granule output section, wherein the proposed device is characterized in that a driven crushing roller is located in the body of the device for crushing dry ice granules, connected to a source of torque, and a rotary support body is located in parallel to this crushing roller in the body of said device, connected to a rotation regulator of said support body. A second crushing roller is installed in the rotary body with the possibility of rotation and with an offset relative to the axis of this body, sequentially connected to the same source of torque through a transmission and a driven crushing roller.

BRIEF DESCRIPTION OF DRAWINGS

[0012] The invention is further described with reference to the accompanying drawings, in which:

[0013] Fig. 1 is an exploded perspective view of a device for regulating the size of dry ice granules and dosing them according to the present invention;

[0014] Fig. 2 is a top view of the device shown in Fig. 1, as viewed from the side of the dry ice container, which is not shown in the drawings;

[0015] Fig. 3 is a sectional view of a device for regulating the size of dry ice granules and dosing them according to the present invention;

[0016] Fig. 4 is an enlarged fragment D of the device shown in section in Fig. 3;

[0017] Fig. 3 shows individual rotary feed elements of the device according to the present invention;

[0018] Fig. 6 is a perspective view in an exploded state of a device for crushing dry ice granules according to the invention;

[0019] Fig. 7 is a disassembled perspective view of a single rotating support body of the device shown in Fig. 6;

[0020] Fig. 8 is a front view of the transmission mechanism as viewed from one side of the device;

[0021] Fig. 9 is a front view of the transmission mechanism as viewed from the other side of the device;

[0022] Fig. 10 is a top view of the transmission mechanism shown in Fig. 9;

[0023] Fig. 11 illustrates the stages of operation of the device shown in Fig. 6.

VARIANT(S) FOR IMPLEMENTING THE INVENTION

[0024] A device for regulating the size of dry ice granules and dosing them for a device for mixing solid dry ice particles with a flow of a gaseous medium, made in accordance with the present invention, is described in the following example of an embodiment and with reference to Fig. 1 - Fig. 6.

[0025] In the presented example of the embodiment, the device 1 for regulating the size of dry ice granules and dosing them comprises a housing 2 in which at least two rotary feed elements 3 are arranged parallel to each other, and a cutting element 4 is arranged between these rotary feed elements 3.

[0026] The housing 2 has an inlet section 5 of the device 1, through which the granules are fed to the rotary feeding elements 3. The section 5 is located on the side of the dry ice container, not shown in the drawings, and preferably has inclined surfaces for feeding the granules to the elements 3 under the action of gravity. On the opposite side of the housing 2, in this case under the elements 3, an outlet section 6 of the device is located, which ensures the directed movement of the granules into the device for mixing dry ice particles with a gaseous medium, such as the device described in the published international application WO 2014/182253 from the same applicant.

[0027] As described below, the outlet section 6 can also discharge the granules into the device 7 for regulating the particle size of the dry ice granules. Thus, this device 7 will be located between the device 1 and the device for mixing the dry ice particles with the gaseous medium.

[0028] The body 2 can be designed with the possibility of being attached to a dry ice container, in the form of its base, or can be designed as part of a dry ice container.

[0029] The rotary feed elements 3 are located in the housing 2 by means of their shafts 31 and bearings 8 and are driven into rotational motion in such a way that they rotate towards each other. In the example shown, the drive device comprises an electric motor 9 connected to the shaft 31 of one of the elements 3, and a transmission 10 formed by toothed wheels located on the shafts 31 of the elements 3, so that the elements 3 rotate towards each other in the direction of passage of granules from the inlet section 5 to the outlet section 6 of the device 1.

[0030] In particular, as shown in Fig. 1, the housing 2 is formed from two parts connected to each other. This specific example of the design of the housing 2 is only one of the possible configurations of the housing 2, and other designs suitable for the device 1 according to the present invention are not excluded. In one part of the housing 2, on its outer side, a cavity is formed which serves as a space 11 for the transmission mechanism and in which the gear transmission 10 is located, while the cavity is closed by a cover 12. In the other part of the housing 2, on the opposite outer side, there is a flange 13 providing for the connection of the electric motor 9 to the shaft of one of the rotary feeding elements 3. It is also possible to use independent drives for the individual elements 3 to create the corresponding specific conditions for regulating the size of the dry ice particles, provided that the described direction of rotation remains unchanged. In addition, instead of the electric motor 9, another suitable motor, such as a pneumatic motor, can be used as a drive. In addition to gear wheels, the transmission 10 can also be formed by other known means.

[0031] The rotary feed elements 3 are made in the form of rotary rollers 32 having recesses 33 located along the circumference of the rollers and intended for transferring dry ice granules during rotation of the element 3. The recesses 33 are oriented in the axial direction of the element 3 and are arranged sequentially in at least two rows along the length of the roller 32 of the element 3, wherein each of the two adjacent rows of recesses 33 for transferring granules are offset or rotated relative to each other. This device resembles a set of several adjacent gear wheels located close to each other on a shaft, wherein these gear wheels are rotated relative to each other, that is, their teeth and the pitch between the teeth are not located along the same line with each other. In fact, stepped rollers 32 are obtained.

[0032] As shown in Fig. 3, in this particular example of the embodiment of the feed elements 3, each roller 32 has three rows of U-shaped recesses 33 located along the circumference of the roller and offset relative to each other, wherein each row has ten recesses 33 and is rotated relative to the previous row of recesses 33. With regard to manufacture, each row of recesses 33 is preferably designed as a separate feed element 34, wherein the elements 34 are then located tightly in a row one after the other on the shaft 31 of the element 3 and are rotated relative to each other, so that the teeth 331 formed by the recesses and the recesses 33 are not located in line with each other.

[0033] The size of the recess 33, that is, its width and depth, are selected depending on the size of the dry ice granules to be transferred, so that granules of a given size can easily fall into the recess 33 and, by means of said recess, can be transferred and freely fall out of it in the outlet section 6 of the device 1.

[0034] In general, the size, shape, number and location of the recesses 33 can be selected depending on the characteristics of the granules being transported and should be such as to ensure the transfer of the required volume of granules.

[0035] Between the elements 3, a cutting element 4 is located. In this example of the embodiment, the cutting element 4 has the shape of a prism, wherein one of the side surfaces of the prism comprises a pair of cutting edges 41. As a rule, the cutting edges 41 are arranged so that at least one cutting edge 41 is interconnected with each rotary feed element 3. Thus, for each roll 32 of the element 3, there is at least one cutting edge 41.

[0036] In the illustrated example of the embodiment, the edges 41 are located relative to the rollers 32 of the feed elements 3 at the level of the line OS of the connection of the axes of rotation of the elements 3 or may even be slightly below this level. Thus, the range of positions of the edges 41 is within the values below the level of the line OS of the connection of the axes of rotation of the elements 3, including the position of said edges at the level of this line. To clarify, the position below the line OS of the connection represents the position in the direction of the discharge section 6 of the device 1.

[0037] The geometric configuration of the edges 41 themselves ensures a clean cutting of the granules and allows the remaining granules to be transferred by means of subsequent transport recesses 33. For this purpose, the angle y between the line OS of the connection of the axes of rotation of the elements 3 and the surface 42 of the cutting element 4 is in the range from 0° to 45°, and this applies to both cutting edges 41.

[0038] Between the roller 32 and the cutting edge 41 there is a certain gap X, which affects the regulation of the size of the granules. As a rule, the value of the gap X must be less than the minimum size of the transported granules in order to prevent the free passage of granules with an unregulated size, while with respect to the working function, the gap must not be zero.

[0039] The described geometric configuration of the rolls 32 and cutting edges 41 is shown in fragment D of Fig. 4. The arrows R shown above the rolls 32 of the feed elements 3 show the direction of rotation of the said rolls.

[0040] In general, the position and geometric configuration of the cutting element 4 should be such that, when the rollers 32 of the elements 3 rotate, only the size of the granules is adjusted and they are loaded into the transport recesses 33. In this way, the cutting element 4 will cut those fractions of the granules that, after loading into the recesses 3, protrude beyond the contour of the rollers 32, while the capture of the granules and their pressing against the contact walls of the rollers 32 and the transport recesses 33 will not occur. Otherwise, undesirable adhesion of the particles to the walls of the rollers 32 and the recesses 33 could occur, and thus a loss of the feeding function and, at the same time, a decrease in the throughput of the feeding elements 3.

[0041] As regards assembly, the precise connection of the parts of the device 1 is preferably carried out by means of standard fasteners using pin connections.

[0042] The device 1 for regulating the size of dry ice granules and their supply operates as follows.

[0043] From a dry ice container, which is not shown in the drawings, dry ice granules are fed, as a rule, under the action of gravity, into the inlet section 5 of the device 1. These granules are usually in the form of cylindrical particles, the length of which in the axial direction is several times greater than their diameter. The feeding elements 3 rotate, driven by an electric motor 9, in a direction towards each other relative to the direction of passage of the granules from the inlet section 5 into the outlet section 6 of the device 1. As a result, the recesses 33 formed in the rollers 32 of the elements 3 are filled with granules, which, by means of these recesses, move around the cutting edge 41 of the cutting element 4 to the outlet section 6 of the device 1.

[0044] At the edge 41, the granules are ordered, that is, the fractions of the granules protruding from the recesses 33 are adjusted to a size that allows said granules to pass by the cutting edge 41, while preventing unwanted pressing of the granules into the recesses 33 and their adhesion to the surface of the rollers 32. The granules that did not fall into the recess 33 after passing around the cutting edge 41 are directed to the next approaching recesses 33. After the recess 33 has passed around the edge 41, a measured portion of the granules, determined by the size of the recess 33, is freely poured out into the discharge section 6 of the device 1.

[0045] If accumulations or lumps of dry ice granules have formed in the dry ice container, then, thanks to the toothed surface of the rollers 32 of the feeding elements 3, said lumps are broken up during their rotation without the need to use any additional or other device for breaking up lumps of granules, such as devices used in known devices. In addition, the cutting element 4, thanks to its location, increases the axial distance between the rollers 32, thereby increasing the working space of these rollers. The said breaking up of the lumps of granules occurs gradually, without disrupting the continuity of loading the transport recesses 33 and, therefore, without affecting the accuracy of the measured amount of transported granules. The device 1, having the said design, along with performing the main specified functions of regulating the size of the granules and their dosing, also eliminates the need to use other systems to prevent the formation of lumps, and also ensures the continuous performance of the function of freeing the passage for feeding granules into the dry ice container.

[0046] For the sake of completeness of the presentation of the material, it should be said that the cutting element 4 can be made in different ways, both fixed and adjustable, as well as fixed in a new position after the required adjustment of the granule size, or in the form of a constantly rotating element. This embodiment provides the possibility of further processing of the granules. Another function of the cutting element 4 is also a protective function, the presence of which prevents foreign objects, the size of which exceeds the gap X, ensuring cutting, from entering the space between the rollers 32.

[0047] In another example of an embodiment, described below with reference to Fig. 6 - Fig. 10, the device 1 for regulating the size of the dry ice granules and dosing them is supplemented by a device 7 for crushing the granules, which can further regulate, or reduce, the size of the measured granules. For clarity, the device 7 for crushing the granules is shown separately in Fig. 6 - Fig. 10.

[0048] According to this embodiment example, the device 7 for crushing dry ice granules is connected to the device 1 for regulating the size of dry ice granules and dosing them, which is described in the previous embodiment example, namely, to the outlet section

6 devices 1.

[0049] In the illustrated embodiment, the device 7 comprises a housing 71 in which a driven crushing roll 15 is mounted for rotation. In this example, the crushing roll 15 is driven into rotation by an electric motor 16 connected to the shaft 151 of the roll 15 via a transmission 23. The crushing roll 15 can also be connected directly to a torque source, without using the transmission 23, but such a solution would be less preferable from the point of view of the space occupied.

[0050] A rotary support housing 17 is installed parallel to the driven crushing roller 15, which is located in the housing 71 of the device 7 and on which a second crushing roller 18 is mounted with the possibility of rotation, offset relative to the axis of this housing 17, that is, installed in an eccentric manner.

[0051] The rotating support housing 17, shown separately in Fig. 7, in this example of an embodiment comprises circular disks 19, between which a separating block 20 is located, and a second crushing roller 18 is rotatably mounted next to the separating block 20 and offset relative to the axis of the support housing 17. In the presented example of an embodiment, the support for rotating the second crushing roller 18 is provided with bearings 21 in the circular disks 19, and the support for rotating the support housing 17 is provided with bearings 22 in the housing 71 of the device 7, in particular, in accordance with the example shown, in the housing 71 of the device 7 and in the side wall 72 of this housing, closing the chamber of the housing 71, in which the crushing roller 15 and the rotary support housing 17 are located. However, other embodiments of the housing 71, having a chamber for accommodating the roller 15 and the housing 17, which can be made by known methods, are not excluded. The side wall 72 of the housing 71 in the example shown serves to accommodate the rotating parts of the device 7, i.e. the roller 15 and the support housing 17, as well as to mount the drives of the device 7, i.e. the electric motor 16 and the regulating electric motor 24.

[0052] On the side opposite the second crushing roller 18, the separating block 20 comprises a profiled outer surface 201 providing an input surface for granules between the crushing rollers 15, 18. This surface 201, during the crushing of the granules, is located on the side of the granules fed from the device 1, thereby facilitating the entry of granules exiting the granule size control device between the crushing rollers 15, 18.

[0053] The control of the rotary support housing 17 is provided by the regulating electric motor 24, which is usually a stepper motor connected to the shaft 171 of the support housing 17 via the transmission 25. The support housing 17 can also be connected directly for regulation without using the transmission 23, but this solution would be less preferable from the point of view of the space occupied.

[0054] The gears 23 and 25 are located on the outer side of the side wall 72 of the housing 71 and are closed by a cover 26. In particular, Fig. 8 shows a front view of the gears 23, 25. In this example, the gears 23, 25 are formed by pairs of gear wheels, but said gears can also be made in other known corresponding ways.

[0055] A head 27 for setting the zero position of this housing is attached to the end of the shaft 171 of the support housing 17. A sensor 28 of the position of the shaft 171 is connected to the head 27. In the illustrated embodiment, the sensor 28 is mounted on the cover 26, which closes the gears 23, 25.

[0056] The second crushing roller 18 is driven into rotation by the electric motor 16 via the shaft 151 of the driven crushing roller 15 and via the transmission 29. The transmission 29 is located on the outer side of the housing 71 opposite the side wall 72. In particular, Fig. 9 shows a front view of the transmission 29, and Fig. 10 shows a top view of the transmission 29. In this example, transmission 29 is formed by a set of gear wheels 291, 292, 293, 294, 295. One gear wheel 291 is mounted on shaft 151 of drive crushing roller 15. Another gear wheel 292 is mounted on a separate shaft 296, located in housing 71 and in cover 300, closing transmission 29. Another gear wheel 293 is mounted on a second separate shaft 297, which is located on the axis of rotation of rotary support housing 17, but is not connected to it, while this shaft is also mounted in housing 71 and in cover 300, closing transmission 29. The next gear wheel 294 is also located on the second separate shaft 297. Another gear wheel 295, the last in the sequence, is mounted on shaft 181 of the second crushing roller 18.

[0057] The transmission 29 can also be made in another known corresponding way, but in this case the condition of rotation of the drive crushing roll 15 and the second crushing roll 18 towards each other must be met, which in the presented example is ensured by an odd number of gear wheels in the transmission 29. However, the use of gear wheels is preferable from the point of view of the space occupied.

[0058] Thus, the second crushing roller 18 is also driven by the electric motor 16, the torque of which, through the transmission 29, is transmitted by the shaft 151 of the driven crushing roller 15 to the shaft 181 of the second crushing roller 18. Thus, the second crushing roller 18 is driven into rotational motion continuously at any position of the rotary support housing 17.

[0059] The gear ratios of the gear wheels 291, 292, 293, 294, 295 of the transmission 29 can be selected to ensure the corresponding peripheral speed of the second crushing roll 18. The peripheral speeds of the driven crushing roll 15 and the second crushing roll 18 can be the same or different. However, for the grinding process, it is preferable that the second crushing roll 18 has a higher peripheral speed than the driven crushing roll 15.

[0060] The transmission 29 is closed by a cover 300, which together with the housing 71 of the device 7 also serves to accommodate the individual shafts 296, 297, which are described above. On the outside of the cover 300, holders 301 for the drives of the device 7, i.e. in this example for the electric motor 16 and the regulating electric motor 24, are preferably attached to it. In this case, the electric motors 16, 24 are mounted along the housing 71 of the device 7, which is advantageous from the point of view of the space occupied.

[0061] As regards the design, the precise connection of the parts of the device 7 is preferably ensured by standard fasteners using pin connections.

[0062] The device 7 for crushing dry ice granules operates according to the sequence described below, wherein the operating stages of the device 7 are illustrated in Fig. 11, where the direction of passage of the dry ice granules is shown by bold arrows for all the operating stages illustrated.

[0063] In the step without crushing the granules, the rotating support body 17 is located, i.e. rotates, in a position in which the gap between the crushing rollers 15, 18 exceeds the maximum size of the granules used. At this step, the size of the granules does not change, and the granules fall under the action of gravity through the gap formed between the rollers 15, 18. This fall under the action of gravity is accelerated by the rotation of the rollers 15, 18, the surface of which partially forms a passage opening for the granules.

[0064] At the stage of crushing the granules, the rotary support housing 17 is located, i.e. rotates, in a position in which the gap between the crushing rollers 15, 18 is smaller than the maximum size of the granules used. At the moment of contact of the granules with the surface of the crushing rollers 15, 18, the size of the granules changes, wherein said gap continuously changes as a result of rotation of the support housing 17, which is controlled by the regulating electric motor 24, i.e. the stepper motor. The second crushing roller 18 is set in rotational motion continuously. The extreme position for the second stage is the position of the crushing rollers 15, 18, in which the distance between the axes of the rollers is minimal, and the position of the rollers corresponds to the horizontal or shortest line of connection of their axes of rotation. This position is called zero, and the distance between the crushing rollers 15, 18, determined by the design, is the smallest of all possible. In the depicted embodiment, it is impossible to change the fraction size below the specified value. However, as an alternative, this zero position can be set for a larger distance between the rollers 15, 18, at which crushing of the granules can still occur, while the size of the crushed granules will be considered to be the minimum possible for this device.

Claims (2)

1. A device (1) for regulating the size of dry ice granules and dosing them for a device for mixing solid dry ice particles with a flow of a gaseous medium, comprising a housing (2) having a granule input section (5) and a granule output section (6), between which a rotary element is located for transporting granules from the granule input section (5) to the granule output section (6), characterized in that at least two rotary feed elements (3) are located parallel to each other in the housing (2), wherein a cutting element (4) is located between said rotary feed elements (3), wherein the feed elements (3) are set in rotational motion with provision of rotation towards each other relative to the direction of passage of granules from the granule input section (5) to the granule output section (6), wherein the rotary feed elements (3) are made in the form of rotary rollers (32) having recesses (33) for transporting granules, located along the circumference of the rollers, wherein said recesses (33) are oriented in the axial direction of the feed element (3) and are arranged successively in at least two rows along the length of the roller (32) of the feeding element (3), and every two adjacent rows of recesses (33) for transporting granules are offset relative to each other, wherein between the rotary feeding elements (3) a cutting element (4) is arranged, which comprises at least one cutting edge (41) at each roller (32), wherein the position of the cutting edges (41) relative to the rollers (32) lies in the range below the level of the line (OS) connecting the axes of rotation of the feeding elements (3), including the position of the cutting edges (41) at the level of the said line (OS) of connection, wherein the angle (γ) between the line (OS) connecting the axes of rotation of the feeding elements (3) and the surface (42) of the cutting element (4) is in the range from 0 to 45° and between the roller (32) and the cutting edge (41) there is a gap (X), the size of which is less than the minimum size of the granules to be transported. 2. The device according to claim 1, characterized in that a device (7) for crushing dry ice granules is connected to its granule output section (6), in the housing (71) of which a driven crushing roller (15) is installed, connected to a source of torque, and parallel to the crushing roller (15) in the housing (71) of said device (7) there is a rotating support housing (17), connected to a rotation regulator of said support housing (17), and in the rotating support housing (17) with the possibility of rotation and with an offset relative to the axis of said housing (17) a second crushing roller (18) is installed, sequentially connected to the same source of torque by means of a transmission (29) and a driven crushing roller (15).