CN110402291B - Improved roller for the grinding treatment of leather - Google Patents
Improved roller for the grinding treatment of leather Download PDFInfo
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- CN110402291B CN110402291B CN201780087938.3A CN201780087938A CN110402291B CN 110402291 B CN110402291 B CN 110402291B CN 201780087938 A CN201780087938 A CN 201780087938A CN 110402291 B CN110402291 B CN 110402291B
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- hollow body
- movable hollow
- drum
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- C—CHEMISTRY; METALLURGY
- C14—SKINS; HIDES; PELTS; LEATHER
- C14B—MECHANICAL TREATMENT OR PROCESSING OF SKINS, HIDES OR LEATHER IN GENERAL; PELT-SHEARING MACHINES; INTESTINE-SPLITTING MACHINES
- C14B1/00—Manufacture of leather; Machines or devices therefor
- C14B1/40—Softening or making skins or leather supple, e.g. by staking, boarding, or crippling machines, by dry mills
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- C—CHEMISTRY; METALLURGY
- C14—SKINS; HIDES; PELTS; LEATHER
- C14B—MECHANICAL TREATMENT OR PROCESSING OF SKINS, HIDES OR LEATHER IN GENERAL; PELT-SHEARING MACHINES; INTESTINE-SPLITTING MACHINES
- C14B3/00—Milling leather
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Treatment And Processing Of Natural Fur Or Leather (AREA)
- Treatment Of Fiber Materials (AREA)
- Rolls And Other Rotary Bodies (AREA)
Abstract
An improved roller for the grinding process of leather, the improved roller comprising: a support frame (2) resting on a reference surface of the industrial plant; a movable hollow body (3) coupled with the supporting frame (2) and made of an at least partially heat-conductive material, receiving in its internal volume (4) the leathers to be treated by grinding; motorized means operatively connected to the movable hollow body (3) in such a way as to place the hollow body in rotation about the linear axis (X) when the leathers have to be treated in the internal volume (4) of the hollow body (3); a casing (5), said casing (5) being coupled with the supporting frame (2) and surrounding the movable hollow body (3), the casing (5) defining, with the movable hollow body (3), an annular space (6). In particular, the improved drum (1) comprises a conditioning circuit (7), said conditioning circuit (7) being fed by air (A)1) Cooperating with the movable hollow body (3), a conditioning circuit (7) conveys air (A) within the annular space (6) at a given temperature1) The conditioning circuit (7) is modified by means of conditioning means according to the possible requirements of the treatment of the leathers inside the rotating hollow body (3) so that the outer wall (3a) of the hollow body (3) is maintained at a predetermined temperature considered sufficient for each stage of the treatment of the leathers in the hollow body (3), and the structural assembly (8) formed by the casing (5) and the movable hollow body (3) defines a heat exchanger in which the air (A) conveyed into the annular space (6) and flowing around the outer wall (3a) of the hollow body (3)1) Represents a first one of the heat exchange fluids and is hot at least in an initial phase of the leather treatment, so as to contribute to heating the leather in the internal volume (4) of the hollow body (3); and is cold in the later stages of leather treatment, in order to dissipate the excess heat generated by the friction of the leather moving in the internal volume (4) of the hollow body (3).
Description
Technical Field
The present invention relates generally to leather processing machines, such as improved drums for the grinding treatment of leather in the leather industry.
Background
It is clear from the outset that, in the leather industry, the term "milling" means a mechanical process in which the leather is immersed into a drum, the generally dry leather is moved as the drum is rotated by motorized means, so as to make the leather softer and eliminate any existing wrinkles (fold), and the leather is therefore ready for a subsequent processing stage.
In fact, the material undergoes a mechanical action as it rolls within a cylindrical (generally punched) body which constitutes the main part of the machine (or cylinder) and works by rotating about a substantially horizontal transverse axis (transverse axis).
Simultaneously with the mechanical action, it is possible to condition the material present inside the cylindrical drum by means of air subjected to predetermined temperature and humidity conditions.
Finally, the product is cooled by means of a circulation of cold air. By varying the processing time it is possible to have a more or less strong effect.
In essence, therefore, the grinding cycle that the leathers undergo inside the cylindrical body of the tannery drum is carried out according to a determined "recipe" (which basically comprises pre-established temperature and humidity conditions, the rotation speed of the cylindrical body imparted by suitable motorized means operatively connected to the cylindrical body, the type and quantity of leathers treated inside the drum and the duration of the grinding cycle.
This "recipe" allows to obtain in a general and hypothetical way the desired and expected level of softness of the dry leather processed in the grinding cycle.
In the leather industry, a drum is a processing device that softens leather using centrifugal force by rotation: the leather is softened inside a rotating hollow body (drum) in which it is housed by means of rectangular or trapezoidal deflectors (or blades) evenly distributed on the inner wall of the hollow body itself.
In general, tannery grinding cylinders comprise two types of structure, the first of which provides that the rotating hollow body containing the leathers is circular, and the second provides that the aforesaid rotating hollow body is octagonal.
Both types of cylinders, used for several years in the leather tanning industry, simply utilize the centrifugal force generated by the hollow body in rotation to soften the leather: it follows that the efficiency of softening and generally the quality and surface yield (surface yield) of the leather is rather low or at least can be widely improved.
Furthermore, during the grinding process, i.e. when the hollow body rotates about a linear, substantially horizontal axis, the constant impact over time of the leathers contained in the rotating hollow body of the drum (in particular if it is cylindrical) reduces the structural integrity of the hollow body, thus bringing about a significant economic drawback.
Tannery drums having the specific constructive concept described in patent publication CN203247270(U) have attempted to remedy to some extent these drawbacks, in short, providing the interposition, between the movable hollow body of the drum and the casing, of heating means placed in rotation around a linear axis by motorized means when the leathers have to be treated in the internal volume of the hollow body, the casing surrounding the movable hollow body in such a way as to define an annular space in which the heating means are precisely housed, operating by irradiation on the structure of the rotating hollow body and, in turn, on the leathers to be ground, which facilitates the treatment of the leathers actuated by means of hot or cold air blown inside the hollow body itself.
However, the development (evolution) of the drum for the grinding of leathers described in this prior patent document CN203247270(U) also presents some undeniable and acknowledged drawbacks, the first of which is undoubtedly represented by the following fact: the heating means inserted in the annular space between the outer casing and the inner hollow body (drum) can by definition only work by heating the latter and therefore in turn the leathers contained therein.
It follows that this constructive solution does not in any way allow to dissipate the excess heat, which is notoriously formed during the grinding process inside the rotating hollow body, due to the mutual friction of the leathers and the impact of the leathers against the inner wall of the hollow body and against the deflecting blades (deflecting blades) during the latter rotation-and is inconvenient and undesirable with respect to the set processing temperature during the grinding process.
In contrast, the heating mechanism mounted in the drum mentioned in the prior document CN203247270(U) teaches negatively in the opposite direction to the need to dissipate the heat generated by the leather itself on the rotating cylindrical hollow body when it is subjected to grinding, which is generally strict and related to the final quality of the leather.
A second drawback of the drum described in the prior art document CN203247270(U) is related to the increased complexity of its construction and assembly due to the fact that the heating means must be designed to remember that it is integral with the hollow body which rotates during operation, given the particular type and the specific position of the heating means provided by the drum.
The last but not least drawback of the prior art closest to the present invention, constituted as described by the prior art document CN203247270(U), is related to the following requirements: suitable and onerous constructive safety measures are adopted for managing the electric energy deriving from the installation of the heating means in the internal compartment-annular space formed by the casing and the internal hollow body of the drum in which the heat is generated.
Disclosure of Invention
The present invention therefore seeks to improve upon the above-mentioned disadvantages of the state of the art, from the recognition thereof.
In particular, the main object of the present invention is to provide an improved drum for the grinding process of leather which allows to substantially maintain the inner hollow body containing the leather being processed at a given predetermined temperature throughout the grinding process.
In other words, the main object of the present invention is to achieve an improved drum for the grinding treatment of hides, contrary to what happens in equivalent drums of known type, which allows managing the heat generated by moving the hides inside a rotating hollow body during the grinding cycle, dissipating it.
Within this scope, the task of the present invention is to produce an improved drum for the grinding treatment of leathers which allows to obtain, at the end of the treatment, a finished product of better quality in terms of softness, uniformity and surface homogeneity with respect to similar known drums.
Another task of the present invention is to adjust an improved roller for the grinding treatment of hides, which increases the production efficiency with respect to the equivalent prior art
Another object of the present invention is to indicate an improved drum for the grinding treatment of leathers which presents a constructive concept and/or assembly procedure that is simpler than that of drums closest to the known and compared more advanced technologies.
Another object of the present invention is to devise an improved drum for the grinding treatment of hides, the operation of which is also easier to design in terms of safety than equivalent drums of known type.
A last but not least object of the present invention is to provide an improved drum for the grinding treatment of leathers which has competitive production costs even in terms of enhanced functionality, which enables the other objects listed above to be achieved.
The above objects are achieved by means of an improved drum for the grinding treatment of hides according to the present disclosure, as mentioned hereinafter, for the sake of simplicity of exposure.
Further constructive features of the details of the improved drum for the grinding treatment of leathers according to the invention are contained in the present disclosure.
The improved roller for the grinding treatment of hides, defined explicitly and specifically hereinafter, is an integral part of the present description.
Advantageously, the improved drum for the grinding process of hides of the invention allows to control and maintain substantially constant the internal and external temperature (and therefore also the humidity) of the rotating internal hollow body containing the hides being processed throughout the grinding process.
This depends on the fact that the drum of the invention comprises in particular a conditioning circuit cooperating with the movable hollow body by air, which conditioning circuit itself delivers air in the annular space at a given temperature, which conditioning circuit is modified by conditioning means according to the possible needs of the treatment of the leathers inside the rotating hollow body in such a way as to keep the outer wall of the hollow body at a predetermined temperature, which is considered sufficient for each stage of the treatment of the leathers in the hollow body.
Furthermore, the main advantage associated with the present invention is due to the fact that the structural assembly formed by the casing and the movable hollow body defines a heat exchanger in which the aforesaid air conveyed into the annular space and flowing around the outer wall of the hollow body represents the first of the heat exchange fluids, and at least:
the leathers in the hollow body are heated in an initial phase of the process of rotating the leathers in the hollow body so as to contribute to heating the leathers in the internal volume of the hollow body;
cold in the later stages of the treatment of the leather, in order to dissipate the excess heat generated by the friction moved by the leather in the internal volume of the hollow body.
Therefore, also advantageous is the improved drum for the grinding treatment of hides of the invention, by means of suitable regulation of its specific and unique regulation circuit, which allows dissipation of the heat generated by the movement of the hides within the rotating hollow body during the grinding cycle, which guarantees an optimal quality of the finished product at the end of the treatment, or at least certainly better than that provided by equivalent drums of known type.
Thus, in an advantageous manner, thanks to the temperature and humidity control provided by the drum of the invention, the improved drum of the invention achieves values of production efficiency and overall quality in leather that are greater than those of comparable similar drums.
It is also advantageous that the improved drum for the grinding treatment of leathers, which is the subject of the present invention, presents a simpler constructive concept than equivalent drums of known type, resulting in the manpower and raw materials for its construction being identical, with all the advantages of its rather competitive production costs, being easier to assemble, in particular with respect to the latter.
Drawings
Said objects and advantages, as well as others that will appear later, will be derived to a greater extent from the following description which relates to a preferred embodiment of the improved drum for the grinding treatment of leathers of the invention, given by way of indication and illustration, but not by way of limitation, by means of the attached figures, in which:
figure 1 is a schematic and simplified top plan view of the improved drum of the present invention in an operating condition;
FIG. 2 is an enlarged view of the construction assembly of FIG. 1;
FIG. 3 is another enlarged view of the construction assembly of FIG. 1;
FIG. 4 is an enlarged detail of FIG. 3.
Detailed Description
The improved roller of the invention, particularly and exclusively for the grinding treatment of leather, is schematically and illustratively shown in fig. 1, wherein the improved roller is generally numbered 1.
As can be observed, this improved drum 1 comprises:
a supporting frame, generally numbered 2 and only partially visible (not contributing to the innovative technical concept underlying the present invention), suitable for resting on a reference surface (not shown) of the industrial plant;
a movable hollow body 3, the movable hollow body 3 being coupled with the supporting frame 2 and being made of an at least partially heat-conductive material (for example stainless steel), the movable hollow body 3 being suitable for receiving in its internal volume 4 the leather to be treated by grinding;
motorized means, not represented for the sake of exposition convenience, operatively connected (or associated (key)) with the movable hollow body 3 in such a way as to place the hollow body in rotation about the linear axis X when the leathers have to be treated in the internal volume 4 of the hollow body 3;
a casing 5, which casing 5 is coupled with the supporting frame 2 and completely surrounds the movable hollow body 3, the casing 5 defining, with the movable hollow body 3, an annular space (or peripheral chamber) 6, the annular space (or peripheral chamber) 6 presenting a width dimension depending on the overall dimensions of the modified drum 1, generally not exceeding 20-25 cm.
According to the invention, the improved drum 1 comprises: a conditioning circuit, indicated as a whole by 7, which passes through the air A1In cooperation with the movable hollow body 3, the conditioning circuit 7 delivers air a at a given temperature in the annular space 61This regulating circuit 7 is modified by regulating means (not shown) according to the possible requirements of the treatment of the leathers inside the rotating hollow body 3 in such a way as to keep the outer wall 3a of the hollow body 3 at a predetermined temperature considered sufficient for each stage of the treatment of the leathers in the hollow body 3; and a structural assembly, indicated as a whole with 8, formed by the casing 5 and the movable hollow body 3, defining a heat exchanger in which the air a is introduced1Is conveyed in the annular space 6 and flows around the outer wall 3a of the movable inner hollow body 3, air a1Represents a first one of the heat exchange fluids, and at least:
hot in the initial phase of the treatment of the leathers in the rotating hollow body 3, so as to contribute to heating the leathers in the internal volume 4 of the hollow body 3;
cold (or at a cooler temperature) in the later stages of the treatment of the leather, in order to dissipate the excess heat generated by the friction of the leather moving in the internal volume 4 of the hollow body 3.
In particular, the second of the heat exchange fluids of the aforesaid heat exchangers defined by the structural assembly 8 consists of air a2Composition of air A2Independently and differently from the air a circulating in the annular space 61And is introduced into the internal volume 4 of the hollow body 3 through an auxiliary regulation circuit, which cooperates with the hollow body 3, generally reported at 9.
In this constructive solution, as is also evident from fig. 2, by way of a pure embodiment, the air a1And air A2Are flow consistent or co-current.
Furthermore, the casing 5 is made of any of the materials selected from the group consisting of wood, plastic materials (for example typically polypropylene), metallic materials and/or combinations thereof (traditional materials used for these applications in the tanning field) and has in general the function of supporting and forming an annular space (or peripheral chamber) 6.
Furthermore, preferably, the casing 5 comprises an internal insulating coating 10, which internal insulating coating 10 is fixed to the internal surface 5a of the casing 5 and faces the external wall 3a of the internal hollow body 3 in such a way as to be housed in the annular space 6. In detail, the internal insulating coating 10 is arranged on the whole internal surface 5a of the casing 5, both on the lateral sides 5b, 5c and on the side walls 5 d.
Preferably, but not necessarily, the internal insulating coating 10 has a thickness of 4cm and is made of any of the foam materials selected from the group consisting of Polyurethane (PU), Polyethylene (PE) and/or the like, and is coupled with the casing 5 by means of connection means of the type known per se to the skilled person, such as adhesive substances, screws, bolts and/or the like.
It will be appreciated that the outer shell of the improved drum of the present invention will advantageously, although not necessarily, be made of a metallic material if an internal insulating coating is provided in the annular space, particularly in such a case that the internal insulating coating will suitably perform the function of preventing heat from diffusing through the metallic structure of the outer shell.
In constructive terms, in this case, but purely as a preferred and non-restrictive title, the housing 5 is movable integrally and synchronously with the hollow body 3, rotating about the linear axis X during the treatment of the leather: this is to improve the efficiency of the treatment itself, ensuring the air A1Greater backflow in the annular space 6.
It will be appreciated that in other embodiments of the improved drum of the present invention (not shown), the outer shell may constitute a fixed or movable part asynchronously with respect to the inner hollow body at different speeds.
Furthermore, the movable inner hollow body 3 and the outer shell 5 are mutually coaxial and preferably have a cylindrical profile closed transversally by respective transversal flaps (transversal flaps) 3b, 3c and 5b, 5 c.
According to the preferred embodiment of the invention described herein, the conditioning circuit 7 is advantageously arranged outside the movable hollow body 3 and the casing 5 and is at least partially supported by the bearing frame 2, resulting independently of the rotation about the linear axis X.
This constructive arrangement allows the improved drum 1 of the invention to be distinguished from the closest known art, constituted for example by the document CN203247270(U), in which a (pure) heating means is housed in the interstitial space defined between the inner hollow body and the outer shell: in fact, the constructive solution associated with the present invention allows greater safety of the mechanical parts and of the plant operators with respect to the prior art, since the adjustment device 7 is released from the rotation of the inner hollow body 3 (and of the casing 5) during operation and is not affected by the high temperatures generated in the structural assembly 8, and, however, this high temperature is advantageously managed by a suitable regulation of the operation of the adjustment device 7.
Thus, in the present invention, the installation of the conditioning circuit 7 not only outside the internal hollow body 3 but also outside the casing 5 allows the improved drum 1 to avoid the technical constructive and equipment engineering complexities that are possible to find in the aforesaid closest prior art (it should be considered necessary to manage the installation and operation of the transmission elements installed in the annular space, as occurs in CN203247270(U), which presents constraints and risks of handling from an electrical point of view).
Moreover, in the herein described preferred embodiment of the improved drum 1 of the invention, the regulation circuit 7 also presents the advantage of not being negligible, being easier to undergo inspection, maintenance, repair and/or replacement with respect to the current state of the art equivalent to this embodiment, thus having further advantages both in terms of operator intervention and in terms of economy.
In more detail, fig. 1 shows that, in a particular case, the regulation loop 7 comprises:
a first fan 11, the first fan 11 being in contact with the external environment adjacent to the hollow body 3 and being suitable for blowing air a1Into the annular space 6;
a first diverter or first exchange valve 12, taking into account the air A1A flow direction into the annular space 6, the first diverter or first crossover valve 12 being placed downstream of the first fan 11;
a first heating device, indicated as a whole with 13, arranged between the first diverter or exchange valve 12 and the movable hollow body 3.
In particular, the regulation circuit 7 defines a closed-loop path in such a way that the air a introduced into the annular space 6 through an axial inlet 14 formed in the casing 51An axial outlet 15, also clearly visible in fig. 3, formed in the housing 5 emerges from the annular space 6 and is recovered by the first fan 11.
Precisely, the above-mentioned regulating means determine that the first heating means 13 operate when the first diverter valve or first exchange valve 12 is closed and air from the outside environment at room temperature is inhibited from passing through the first diverter valve or first exchange valve 12.
In the presence of excessive overheating of the inner hollow body 3, mainly caused by the leather moving in the internal volume 4 of the hollow body 3 during the rotation of the inner hollow body 3 about the linear axis, the regulating device suitably controls the regulating circuit 7, closing the first heating means 13 and opening the first diverter or first exchange valve 12 to allow the cooler air to enter the annular space 6-at room temperature-capable of cooling the external wall 3a of the hollow body 3.
It follows that, in a given limited phase of the whole grinding cycle, a "cold" grinding allows to disperse during the grinding the excess heat generated by the mutual friction of the leathers and of the same leathers against the inner wall 3d of the hollow body 3 and against the deflecting blades (partially visible in the enlarged view of fig. 4, in which the deflecting blades are numbered with 22), which in the prior art is not in any way disadvantageously verifiable.
More specifically, a first heating means 13, such as for example at least one electrical resistance, is arranged upstream of an axial inlet 14 formed in the casing 5.
As far as the auxiliary regulation circuit 9 is concerned, fig. 1 illustrates that the auxiliary regulation circuit 9 preferably, but not exclusively, comprises:
a second fan 16, the second fan 16 being in contact with the external environment adjacent to the hollow body 3 and being suitable for blowing air a2Into the internal volume 4 of the hollow body 3 itself;
a second diverter or crossover valve 17, taking into account the air A2In the direction of flow input into the movable hollow body 3, the second diverter or crossover valve 17 is placed downstream of the second fan 16;
second heating means, generally indicated with 18, arranged between the second diverter or exchange valve 17 and the movable hollow body 3.
Also in this case, in particular, the auxiliary regulating circuit 9 defines a closed loop path in such a way that the aforementioned air a introduced into the hollow body 3 through an axial inlet duct (axial entry duct)19 formed in the hollow body 32Exits the hollow body 3 through an axial outlet duct 20 formed in the hollow body 3 and is recovered by the second fan 16.
In an advantageous but non-restrictive manner, the axial inlet 14 is arranged at an axial inlet duct 19, while the axial outlet 15 is arranged at an axial outlet duct 20, as can be observed in fig. 2 and 3.
Furthermore, by observing fig. 1, it can also be stated for the second heating means 18 comprising, for example, at least one electrical resistance, that the second heating means 18 are arranged upstream of an axial inlet duct 19 formed in the hollow body 3.
Preferably, but not necessarily, the auxiliary conditioning circuit 9 also comprises a filtering device, generally numbered with 21 and visible in fig. 1, interposed between the outlet duct 20 and the second fan 16, suitable to confine the air a when the leathers undergo the grinding treatment2Powder present in, air A2Coming from the hollow body 3 and coming into contact with the leather.
From an operational point of view, the motorization means, the regulation circuit 7 and the regulation means, as well as the auxiliary regulation circuit 9, are electrically connected, in a position adjacent to the movable hollow body 3 and to the housing 5 associated therewith, with a central processing and control unit (not shown) which manages its operation, in the case of availability to the operator: in particular, the central processing and control unit manages the activation of the first heating means 13 and of the first diverter or first exchange valve 12 according to the operating requirements in the internal volume 4 of the internal hollow body 3 required to obtain optimal softening of the leathers.
Thus, based on the description that has just been given, it will be understood that the object of the present invention, an improved roller for the grinding treatment of leather, achieves this object and achieves the advantages mentioned previously.
When implemented, the modified drum for the grinding treatment of hides of the present invention can be modified, including for example motorized means of different type and composition compared to those previously described and visible in the drawings, and also suitable conveying means and/or transfer means.
Furthermore, other constructive embodiments of the present invention, not accompanied herein by reference figures, may provide that the regulation circuit comprises components different from, but equal in technical effect to, the components described and illustrated in the figures of the following annexed figures.
Furthermore, other embodiments of the improved drum for the grinding treatment of hides specifically claimed herein may be those in which the adjustment means may be different from those described above, in particular with reference to the preferred embodiment of the improved drum specifically claimed herein, without affecting the advantages provided by the present invention.
It should be noted that in the case where the outer casing is fixed (in any case the embodiment provided by the present invention), the introduction of air into the annular space may not necessarily be axial, as the air inlet may be made in any point of the outer box element if the inner hollow body (or drum) rotates within the fixed outer box element, in which case, unlike the provision of further rotatable wings on the outer casing, there is no particular constructive constraint of the air inlet other than the provision of further rotatable wings on the rotating inner hollow body.
Finally, it is clear that several other changes can be made to the improved drum for the grinding treatment of the leathers involved, without departing from the novelty principles inherent in the inventive concept expressed herein, since it is clear that in the practical embodiment of the invention the materials, shapes and dimensions of the illustrated details can be changed as required and replaced with others that are technically equivalent.
Where structural features and techniques mentioned in the appended claims are followed by reference numerals or signs, those reference signs have been included for the sole purpose of increasing the intelligibility of the claims themselves and accordingly, there is no limiting effect on the interpretation of each element identified by way of example only by such reference signs.
Claims (17)
1. Improved drum (1) for the grinding treatment of leather, comprising:
-a supporting frame (2), said supporting frame (2) being suitable for resting on a reference surface of an industrial plant;
-a movable hollow body (3), said movable hollow body (3) being coupled with said supporting frame (2) and being made of an at least partially heat-conductive material, said movable hollow body being suitable for receiving in its internal volume (4) said leather to be treated by grinding;
-motorized means operatively connected with said movable hollow body (3) in such a way as to place it in rotation about a linear axis (X) when the leathers have to be treated in said internal volume (4) of said movable hollow body (3);
-a casing (5), said casing (5) being coupled with said supporting frame (2) and surrounding said movable hollow body (3), said casing (5) defining, with said movable hollow body (3), an annular space (6),
characterized in that said improved drum (1) comprises a conditioning circuit (7), said conditioning circuit (7) being fed by air (A)1) Cooperating with said movable hollow body (3), said conditioning circuit (7) delivering air (A) within said annular space (6) at a given temperature1) -said conditioning circuit (7) being modified by conditioning means according to the possible requirements of the treatment of the leathers inside the movable hollow body (3) in rotation in such a way that the outer wall (3a) of the movable hollow body (3) is maintained at a predetermined temperature considered sufficient for each phase of the treatment of the leathers in the movable hollow body (3), and the structural assembly (8) formed by the casing (5) and the movable hollow body (3) defines a heat exchanger in which the air (a) conveyed into the annular space (6) and flowing around the outer wall (3a) of the movable hollow body (3) is conveyed to a heat exchanger1) Represents a first one of the heat exchange fluids, and at least:
-is hot in an initial phase of the treatment of the leathers in the rotating movable hollow body (3) so as to contribute to heating the leathers in the internal volume (4) of the movable hollow body (3);
-cold in a late stage of the treatment of the leathers, so as to dissipate the excess heat generated by the friction of the leathers moving in the internal volume (4) of the movable hollow body (3).
2. The drum (1) as claimed in claim 1, characterized in that a second one of the heat exchange fluids of the heat exchanger defined by the structural assembly (8) is constituted by air (a)2) Is composed of air (A)2) Independently of the air (A) circulating in the annular space (6)1) And is introduced into the internal volume (4) of the movable hollow body (3) through an auxiliary regulation circuit (9) cooperating with the movable hollow body (3).
3. The drum (1) as claimed in claim 1, characterized in that the outer shell (5) is made of any of the materials selected from the group consisting of wood, plastic material, metal material and/or combinations thereof.
4. The drum as claimed in claim 1, characterized in that the outer shell (5) comprises an internal insulating coating (10), the internal insulating coating (10) being fixed to an inner surface (5a) of the outer shell (5) and facing the outer wall (3a) of the movable hollow body (3) in such a way as to be housed into the annular space (6).
5. A drum (1), as defined in claim 4, characterized with the inner insulating coating (10) is made of any of the foam materials selected from the group consisting of Polyurethane (PU) and Polyethylene (PE).
6. The drum (1) according to claim 1, characterized in that said casing (5) is movable integrally with said movable hollow body (3), rotating around said linear axis (X) during said treatment of the leathers.
7. The drum (1) as claimed in claim 1, characterized in that said movable hollow body (3) and said outer shell (5) are mutually coaxial and have a cylindrical profile.
8. The drum (1) as claimed in claim 1, characterized in that said conditioning circuit (7) is arranged outside said movable hollow body (3) and said casing (5) and is at least partially supported by said bearing frame (2).
9. The drum (1) as claimed in claim 1, characterized in that said conditioning circuit (7) comprises:
-a first fan (11), said first fan (11) being in contact with the external environment adjacent to said movable hollow body (3) and being suitable for blowing said air (a)1) Into the annular space (6);
-a first diverter or exchange valve (12) taking into account said air (A)1) -said first diverter or crossover valve (12) being placed downstream of said first fan (11) in the direction of flow input into said annular space (6);
-a first heating device (13), said first heating device (13) being arranged between said first diverter or exchange valve (12) and said movable hollow body (3),
the conditioning circuit (7) defines a closed loop path in such a way that the air (A) introduced into the annular space (6) through an axial inlet (14) formed in the casing (5)1) Exits the annular space (6) through an axial outlet (15) formed in the casing (5) and is recovered by the first fan (11).
10. The drum (1) as claimed in claim 9, characterized in that the first heating means (13) operate when the first diverter or first exchange valve (12) is closed and air from the external environment is inhibited from passing through the first diverter or first exchange valve (12).
11. The drum (1) as claimed in claim 9, characterized in that said first heating means (13) are arranged upstream of said axial inlet (14) formed in said casing (5).
12. The drum (1) as claimed in any one of claims 2 to 8, characterized in that an auxiliary regulation circuit (9) cooperating with the movable hollow body (3) comprises:
-a second fan (16), said second fan (16) being in contact with the external environment adjacent to said movable hollow body (3) and being suitable for blowing air (a)2) Into the internal volume (4) of the movable hollow body (3);
-a second diverter or second exchange valve (17) taking into account said air (A)2) -said second diverter or crossover valve (17) is placed downstream of said second fan (16) in the direction of flow input into said movable hollow body (3);
-second heating means (18), said second heating means (18) being arranged between said second diverter or exchange valve (17) and said movable hollow body (3),
the auxiliary regulation circuit (9) defines a closed loop path in such a way that the air (A) introduced into the movable hollow body (3) through an axial inlet duct (19) formed in the movable hollow body (3)2) Exits the movable hollow body (3) through an axial outlet duct (20) formed in the movable hollow body (3) and is recovered by the second fan (16).
13. The drum (1) as claimed in any one of claims 9 to 11, characterized in that the auxiliary regulation circuit (9) cooperating with the movable hollow body (3) comprises:
-a second fan (16), said second fan (16) being in contact with the external environment adjacent to said movable hollow body (3) and being suitable for blowing air (a)2) Into the internal volume (4) of the movable hollow body (3);
-a second diverter or second exchange valve (17) taking into account said air (A)2) In the input into the movable hollow body (3)Said second diverter or second crossover valve (17) being placed downstream of said second fan (16);
-second heating means (18), said second heating means (18) being arranged between said second diverter or exchange valve (17) and said movable hollow body (3),
the auxiliary regulation circuit (9) defines a closed loop path in such a way that the air (A) introduced into the movable hollow body (3) through an axial inlet duct (19) formed in the movable hollow body (3)2) Exits the movable hollow body (3) through an axial outlet duct (20) formed in the movable hollow body (3) and is recovered by the second fan (16).
14. The drum (1) as claimed in claim 13, characterized in that the axial inlet (14) is arranged at the axial inlet duct (19) and the axial outlet (15) is arranged at the axial outlet duct (20).
15. The drum (1) according to claim 12, characterized in that said auxiliary conditioning circuit (9) comprises filtering means (21), said filtering means (21) being interposed between said axial outlet duct (20) and said second fan (16), suitable for constraining said air (a) coming from said movable hollow body (3)2) In said movable hollow body (3), said leather being subjected to said grinding treatment.
16. The drum (1) according to claim 13, characterized in that said auxiliary conditioning circuit (9) comprises filtering means (21), said filtering means (21) being interposed between said axial outlet duct (20) and said second fan (16), suitable for constraining said air (a) coming from said movable hollow body (3)2) In said movable hollow body (3), said leather being subjected to said grinding treatment.
17. The drum (1) according to claim 1, characterized in that said motorization means, said regulation circuit (7) and said regulation means are electrically connected with a central processing and control unit available to the operator, which manages their functions.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT102017000031928 | 2017-03-23 | ||
| IT102017000031928A IT201700031928A1 (en) | 2017-03-23 | 2017-03-23 | PERFECTED BOTTAL FOR THE TREATMENT OF BOTTALING OF THE SKINS |
| PCT/IB2017/057604 WO2018172837A1 (en) | 2017-03-23 | 2017-12-04 | Improved drum for the milling treatment of leathers |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110402291A CN110402291A (en) | 2019-11-01 |
| CN110402291B true CN110402291B (en) | 2021-08-10 |
Family
ID=59521551
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201780087938.3A Active CN110402291B (en) | 2017-03-23 | 2017-12-04 | Improved roller for the grinding treatment of leather |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP3601622B1 (en) |
| CN (1) | CN110402291B (en) |
| BR (1) | BR112019019398B1 (en) |
| IT (1) | IT201700031928A1 (en) |
| WO (1) | WO2018172837A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT201900016685A1 (en) * | 2019-09-19 | 2021-03-19 | Erretre Spa | METHOD OF EXECUTION OF A BOTTLING CYCLE OF LEATHER |
| IT202000019624A1 (en) * | 2020-08-07 | 2022-02-07 | Erretre Spa | INDUSTRIAL LEATHER DRUMING PLANT WITH IMPROVED ENVIRONMENTAL IMPACT |
| CN113862403A (en) * | 2021-11-10 | 2021-12-31 | 无锡市新达轻工机械有限公司 | Cold air type temperature and humidity control leather softening machine system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1623943A (en) * | 1923-05-31 | 1927-04-05 | George S Neeley | Leather-treating process and apparatus for same |
| EP0960948A1 (en) * | 1998-05-27 | 1999-12-01 | ERRETRE s.r.l. | Drum for milling, dyeing and tanning |
| EP1690950A2 (en) * | 2005-02-15 | 2006-08-16 | Erretre S.p.A. | Milling, dyeing and retanning drum |
| CN203247270U (en) * | 2013-01-30 | 2013-10-23 | 温州致富皮业有限公司 | Casing structure of leather milling drum |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015181691A1 (en) * | 2014-05-26 | 2015-12-03 | Cos.T.A. S.R.L. | Thermostatically controlled cylinder for heat treatments, method for making said cylinder and system comprising said cylinder |
-
2017
- 2017-03-23 IT IT102017000031928A patent/IT201700031928A1/en unknown
- 2017-12-04 CN CN201780087938.3A patent/CN110402291B/en active Active
- 2017-12-04 EP EP17823216.1A patent/EP3601622B1/en active Active
- 2017-12-04 BR BR112019019398-7A patent/BR112019019398B1/en active IP Right Grant
- 2017-12-04 WO PCT/IB2017/057604 patent/WO2018172837A1/en unknown
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1623943A (en) * | 1923-05-31 | 1927-04-05 | George S Neeley | Leather-treating process and apparatus for same |
| EP0960948A1 (en) * | 1998-05-27 | 1999-12-01 | ERRETRE s.r.l. | Drum for milling, dyeing and tanning |
| EP1690950A2 (en) * | 2005-02-15 | 2006-08-16 | Erretre S.p.A. | Milling, dyeing and retanning drum |
| CN203247270U (en) * | 2013-01-30 | 2013-10-23 | 温州致富皮业有限公司 | Casing structure of leather milling drum |
Also Published As
| Publication number | Publication date |
|---|---|
| BR112019019398B1 (en) | 2023-05-16 |
| WO2018172837A1 (en) | 2018-09-27 |
| BR112019019398A2 (en) | 2020-04-14 |
| CN110402291A (en) | 2019-11-01 |
| EP3601622A1 (en) | 2020-02-05 |
| IT201700031928A1 (en) | 2018-09-23 |
| EP3601622B1 (en) | 2022-06-29 |
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