Direct drive swivel

Abstract

Title: Direct drive pivot Motorized pivot assembly (100) for a blade of a system for trivializing infectious risk healthcare waste, comprising a pivot module (110) comprising a pivot shaft (111), intended to rotate a blade (40) of a waste trivialization system (1), a first bearing (112) and a second bearing (113), each arranged around the pivot shaft, a motor (120) configured to rotate the pivot shaft characterized in that the motor is a direct drive motor of the pivot shaft, the motor comprising a recess (125) configured to accommodate at least part of the pivot module, and in that the first and second bearings are each arranged on a portion (111a) of the pivot shaft (111) extending from the barycenter (124) of the motor (120) towards the blade (40). Figure for abstract: Fig.2.

Description

Title of the invention: Direct drive pivot Technical field

[0001] The present invention relates to the field of waste trivialization and particularly the treatment of Infectious Risk Healthcare Waste (DASRI). The present invention relates in particular to a motorized pivoting assembly allowing the trivialization of DASRI waste. STATE OF THE ART

[0002] There are waste trivialization systems that allow waste placed in a tank to be crushed. These systems include a motorized pivot assembly, allowing the mechanical crushing of waste in a tank by a blade. For the trivialization of DASRI waste, existing systems are associated with a waste heating system in order to sterilize it.

[0003] For the grinding of DASRI waste, the waste load in the tank is disparate and its inertia during grinding is variable depending on the nature of the waste (for example, fabrics, metal, fluids, etc.). There is no prior knowledge of the mechanical behavior of the load upstream of grinding. The motorized pivot assembly must therefore be robust and have sufficient torque to ensure good grinding of this waste.

[0004] The motorized pivoting assemblies generally used in the field of DASRI waste trivialization have a standard asynchronous or brushless type motorization (also referred to in English as brushless).

[0005] In these solutions, the motor comprises an elastic coupler ensuring the compensation of alignment defects and ensuring a transfer of power to a pivoting module, in alignment with the drive motor. The pivoting module provides the mechanical interface to the grinding device, generally a blade.

[0006] The elements are then typically arranged successively along a direction coincident with the axis of rotation of the blade. This arrangement has the effect of a significant size on the height of the motorized assembly.

[0007] This assembly, conventionally used in training applications, does not allow for a compact and expandable system in terms of waste volume, the size of the motor being directly linked to the output torque. Due to the height required for the motor and the coupler, the tank of a trivialization system must in fact be placed high up on a chassis. In order to avoid imbalance problems, the size of the tank is limited. The volume of waste that can be processed is therefore limited.

[0008] An object of the present invention is therefore to propose an improved solution of a motorized pivot assembly for blade of DASRI biological waste grinding system, in particular to increase waste treatment capacity.

[0009] Other objects, features and advantages of the present invention will become apparent from a consideration of the following description and accompanying drawings. It is understood that other advantages may be incorporated. SUMMARY

[0010] To achieve this objective, according to a first aspect, a motorized pivot assembly is provided for a blade of a waste trivialization system, in particular waste from healthcare activities with infectious risks, comprising: • a pivot module comprising: - a pivot shaft, intended to rotate a blade of a waste trivialization system, around an axis of rotation substantially parallel, and preferably coincident, with the main direction of extension of the shaft, - a first bearing and a second bearing, each arranged around the pivot shaft, • a motor configured to rotate the pivot shaft, the motor having a barycenter.

[0011] The motorized pivot assembly is configured such that the motor is a direct drive motor of the pivot shaft, the motor comprising a recess configured to accommodate at least part of the pivot module, and in that the first and second bearings are each arranged on a portion of the pivot shaft extending from the barycenter of the motor towards the blade.

[0012] Thus, the pivot shaft is directly driven by the direct drive motor. This type of motor, which can also be referred to as a torque motor, can provide a very high torque at constant speed. Since the interfaces between the motor and the drive shaft are limited, the transmission of the torque is improved by a rigid system. This direct drive allows the pivot module to be placed partly in the motor, which reduces the height of the motorized assembly.

[0013] This solution makes it possible to have a motorized pivot assembly whose size is limited while increasing the rotation speed of the pivot shaft and / or the torque generated. During the development of the invention, it was surprisingly demonstrated that this arrangement, associated with the direct drive, improved the longevity of the bearings compared to a conventional arrangement on either side of the motor. The placement of the bearings on the same side of the motor in fact makes it possible to reduce the radial forces exerted on the bearings. This placement of the bearings therefore makes it possible to obtain good mechanical robustness in order to take advantage of high speeds. of rotation and / or the high torque that can be generated, as well as the compactness of the motor. As a result, the invention offers a particularly compact, efficient and robust solution. Thus, this motorized pivot assembly allows the crushing of a large volume of waste.

[0014] In order to increase the compactness of the pivot assembly, the person skilled in the art would have rather turned to solutions implementing a coupler with a drive via an angle transmission and a pulley-belt system. This motorization allows a lateral offset of the motor thus limiting the height of the equipment. However, this solution requires having a motorization with a high torque at a rotation speed at least equal to 1000 rpm, thus degrading the rigidity of the power transmission by introducing numerous mechanical elements requiring adjustments which must persist.

[0015] A second aspect relates to a waste trivialization system, in particular waste from healthcare activities with infectious risks, comprising a tank intended to be supplied with waste, the motorized pivoting assembly, a waste crushing blade arranged inside the tank, the blade being configured to be driven in rotation around an axis of rotation substantially parallel, and preferably coincident, with the main direction of extension of the shaft by the motorized pivoting assembly.

[0016] Advantageously, the tank has a volume greater than or equal to 450 L.

[0017] While current techniques direct those skilled in the art towards support optimization by installing larger frames to support larger tank volumes, the invention claimed herein provides an effective, compact and robust alternative solution.

[0018] The compactness of the motorized pivot assembly makes it possible to lower the center of gravity of the waste trivialization system, making it possible to increase the waste processing capacity while limiting the effects of imbalance during crushing.

[0019] According to one embodiment, the invention comprises a grinding method implementing the waste trivialization system according to the second aspect, the method comprising an introduction into the tank of infectious risk healthcare waste, a grinding of introduced waste, comprising a rotational drive of the pivot shaft by the direct drive motor, inducing a rotation of the grinding blade around an axis of rotation substantially parallel, and preferably coincident, with the main direction of extension of the shaft. BRIEF DESCRIPTION OF THE FIGURES

[0020] The aims, objects, as well as the characteristics and advantages of the invention will emerge more clearly from the detailed description of an embodiment of the latter which is illustrated by the following accompanying drawings in which:

[0021] [Fig.l] [Fig.l] represents a profile view of a waste trivialization system, according to an exemplary embodiment.

[0022] [Fig.2] [Fig.2] represents a diagram of the principle of the pivot assembly with the grinding blade, according to an exemplary embodiment.

[0023] [Fig.3] [Fig.3] represents a profile view of the pivot assembly according to an embodiment of the invention with the grinding blade.

[0024] [Fig.4] [Fig.4] represents a profile view of the pivot assembly according to the same embodiment as illustrated in [Fig.3] without the blade.

[0025] [Fig.5] [Fig.5] represents a profile view of the pivot assembly according to another embodiment according to the invention.

[0026] [Fig.6] [Fig.6] represents a profile view of the disassembly for maintenance of the pivot assembly according to the embodiment illustrated in [Fig.5].

[0027] [Fig.7] [Fig.7] represents a schematic view of the first and second bearings.

[0028] [Fig.8] [Fig.8] represents a view of the bell including the motorized pivot assembly.

[0029] The drawings are given as examples and are not limiting of the invention. They constitute schematic representations of principle intended to facilitate the understanding of the invention and are not necessarily on the scale of practical applications. DETAILED DESCRIPTION

[0030] Before commencing a detailed review of embodiments of the invention, optional features are set out below which may optionally be used in combination or alternatively.

[0031] According to one example, the second bearing is positioned at least partially, and preferably entirely, in the recess of the motor. The second bearing is thus brought closer to the motor. The radial forces on the second bearing are thus limited.

[0032] This positioning at least in part in the motor makes it possible to make the motorized pivot assembly as compact as possible. In addition, the forces on the bearings and the pivot shaft are controlled.

[0033] According to one example, the second bearing is positioned at a distance from a barycenter of the engine, the distance being less than or equal to 45 mm (millimeters).

[0034] The second bearing is arranged as close as possible to the barycenter of the motor, thus limiting fatigue of the second bearing and that of the shaft. The forces between the rotor and the stator are transmitted to the bearings which then hold the pivot shaft in order to limit its movements due to eccentricity.

[0035] According to one example, the pivot module further comprises a coupling member disposed at least in part, and preferably entirely, in the recess of the motor and in which the motor comprises a stator and a rotor, the rotor being configured to directly drive the pivot shaft in rotation via the coupling member.

[0036] The use of a coupling member between the rotor and the pivot shaft makes it possible to minimize the interfaces between the motor and the drive shaft of the grinding blade while ensuring the necessary rigidity of the process. The motorized pivot assembly is also made more compact.

[0037] According to one example, the coupling member extends between the pivot shaft and the rotor, in a main extension plane substantially perpendicular to the axis of rotation of the pivot shaft, over a distance substantially less than or equal to 60 mm.

[0038] In order to ensure mechanical robustness of the motorized assembly, it is preferable that the coupling distance between the rotor and the pivot shaft be reduced. If the sizing is not adequate, additional radial forces will be applied to the bearings, thus impacting their operating longevity.

[0039] According to one example, the coupling member is configured to be mounted on a lower surface of the rotor.

[0040] According to one example, the coupling member is configured to be mounted on an upper surface of the rotor.

[0041] This positioning of the coupling member allows for improved maintenance of the motorized assembly while maintaining compactness.

[0042] According to one example, the coupling member is removably fixed to the rotor, for example by screwing, and the coupling member is removably fixed to the pivot shaft, for example by a pin and a nut.

[0043] This removable attachment of the coupling member makes it easier to maintain the first and second bearings and thus improves the reliability of the system. The bearings being positioned on the upper part and on the same side of the motor, and in synergy with the characteristic according to which the coupling member is configured so as to be mounted on an upper surface of the rotor, maintenance is facilitated by allowing access to the bearings through the upper part of the motor. The risk of damage to the motor during a maintenance operation is limited.

[0044] According to one example, the motor is configured to drive the pivot shaft at a rotation speed greater than or equal to 1000 rpm, preferably greater than or equal to 1200 rpm.

[0045] The required torque depends on the grinding capacity of the machine. In order to To be able to increase the size of the tank while keeping a compact system, the motor must have a sufficient rotation speed to drive the blade and grind the waste.

[0046] According to one example, the distance between the first bearing and the second bearing is less than or equal to 90 mm, preferably less than or equal to 80 mm.

[0047] The forces created by the rotation of the motor are transferred to the shaft bearings. In order not to create premature aging, it has been demonstrated that the distance from the force support point is preferably reduced. This involves reducing as much as possible the distance between the second bearing and the barycenter of the motor but also between the two bearings. The mechanical robustness is therefore increased.

[0048] According to one example, the first bearing and the second bearing are spherical roller bearings mounted around the pivot shaft according to a principle allowing axial thermal expansions.

[0049] According to one example, the first bearing and the second bearing are spherical roller bearings mounted around the pivot shaft, the first bearing being configured to allow a ball joint connection around the pivot shaft, and the second bearing being configured to allow a sliding pivot connection around the pivot shaft.

[0050] According to one example, the waste trivialization system comprises a frame, the frame being configured to allow cooperation between the pivoting module and the tank.

[0051] According to one example, the frame is configured so as to laterally surround the first and second bearings.

[0052] According to one example, the first bearing and the second bearing are spherical roller bearings mounted around the pivot shaft, the first bearing being configured to allow a ball joint connection between the frame and the pivot shaft, and the second bearing being configured to allow a sliding pivot connection between the frame and the pivot shaft.

[0053] This geometry of the bearings makes it possible to obtain a long service life for the motorized assembly with great reliability.

[0054] According to one example, the motorized assembly further comprises an encoder configured to measure a rotational speed of the pivot shaft, the encoder being disposed in the recess of the motor.

[0055] The position of the encoder in the motor recess makes it possible to make the system as compact as possible, while still allowing the shaft rotation speed to be monitored.

[0056] According to one example, the motorized pivot assembly further comprises the grinding blade. The grinding blade is preferably positioned at one end of the pivot shaft, and more preferably its upper end.

[0057] According to one example, the waste trivialization system further comprises a heating system, preferably by microwave, for the waste with a view to disinfecting it, positioned on the tank, thus making it possible to disinfect the waste in parallel with its grinding.

[0058] According to one embodiment of the grinding method, the grinding blade is configured to be driven by the pivot shaft at a rotation speed greater than or equal to 1000 rpm, preferably greater than or equal to 1200 rpm.

[0059] A high speed allows efficient grinding of a large quantity of waste, and in particular for a tank volume greater than or equal to 450 L.

[0060] According to one example, the height under the tank of the motorized pivot assembly is less than or equal to 230 mm.

[0061] According to one example, cooling sleeves can advantageously be integrated into the bell of the motorized pivot assembly in order to cool the motor.

[0062] In the remainder of the description, the term "on" does not necessarily mean "directly on". Thus, when it is indicated that a part or member A is supported "on" a part or member B, this does not mean that the parts or members A and B are necessarily in direct contact with each other. These parts or members A and B may be either in direct contact or be supported on each other by means of one or more other parts. The same applies to other expressions such as, for example, the expression "A acts on B", which may mean "A acts directly on B" or "A acts on B by means of one or more other parts".

[0063] In the present patent application, the term mobile corresponds to a rotational movement or a translational movement or even to a combination of movements, for example the combination of a rotation and a translation.

[0064] In the present patent application, when it is indicated that two parts are distinct, this means that these parts are separate. They are: - positioned at a distance from each other, and / or - movable relative to each other and / or - integral with each other by being fixed by added elements, this fixing being removable or not.

[0065] A single-piece unit cannot therefore be made up of two separate parts.

[0066] In the present patent application, the term "integral" used to qualify the connection between two parts means that the two parts are linked / fixed relative to each other, according to all degrees of freedom, unless explicitly specified differently. For example, if it is indicated that two parts are integral in translation according to a direction X, this means that the parts can be movable one by relative to each other except in the X direction. In other words, if one piece is moved in the X direction, the other piece will move the same way.

[0067] In the detailed description which follows, use may be made of terms such as "horizontal", "vertical", "longitudinal", "transverse", "upper", "lower", "top", "bottom", "front", "rear", "inside", "outside". These terms must be interpreted relatively in relation to the normal position of the motorized pivot assembly, and of the waste disposal system and the normal position direction of the user of the assembly. For example, the notion of "longitudinal" corresponds to the main extension direction of the pivot shaft or even of the tank.

[0068] A reference will also be used whose rear / front direction corresponds to the X axis, the transverse or right / left direction corresponds to the Y axis and the longitudinal or bottom / top direction corresponds to the Z axis.

[0069] The present invention relates to a motorized pivot assembly 100 allowing the trivialization of waste, in particular the trivialization of infectious risk healthcare waste, also called DASRI. This motorized pivot assembly 100 is typically integrated into a waste trivialization system 1. The motorized pivot assembly and the trivialization system 1 are now described according to several particular exemplary embodiments.

[0070] According to one embodiment, illustrated in [Fig.l], the waste trivialization system 1 may comprise a tank 30, and the motorized pivot assembly 100 allowing the rotation of a blade 40 around an axis of rotation AL. The trivialization system 1 may further comprise a heating system 50. The trivialization system 1 may comprise an electrical connection box 20. The latter are preferably electrically connected to computerized control means 60.

[0071] The waste trivialization system 1 is configured so as to allow the grinding of waste, via the motorized assembly 100 and the blade 40, the grinding being preferably associated with the sterilization of the latter via a heating system 50 in the tank 30. For this, the tank 30 is intended to receive waste to be treated. The waste to be treated may be of various natures such as metal waste, fabrics, fluids or even plastic waste. The variable nature of the waste to be treated in the tank 30 means that the inertial behavior of the waste load during grinding is unknown. It is therefore necessary to adapt the trivialization system in order to ensure efficient grinding and to avoid unbalance effects during grinding. For this, the tank 30 is advantageously arranged close to the ground, compared to existing solutions.

[0072] According to one embodiment, the waste trivialization system 1 therefore comprises a grinding system advantageously comprising the motorized pivot assembly 100 and the blade 40. The motorized pivot assembly 100 is advantageously positioned at least partly in a bell 10 in order to create a maneuverable single-piece assembly. The bell 10 may comprise a plate 11 preferably configured to support at least partly the tank 30. The bell 10 may have a frame 11' configured to allow cooperation between the bell 10 and the tank 30. The frame 11' may be integral with the plate 11. Thus, preferably the bell 10, the motorized pivot assembly 100 and the blade 40 are positioned on the bottom of the tank 30.

[0073] The motorized pivot assembly 100 is advantageously configured to drive the blade 40 in rotation around an axis of rotation A1 substantially parallel to the longitudinal axis z in which the tank 30 extends. The rotation of the blade 40 thus allows the grinding of the waste present in the tank 30.

[0074] According to one embodiment, the motorized pivot assembly 100 is configured to be operated by the electrical connection box 20. The electrical connection box 20 and the heating system 50 can each be connected to the computerized control means 60 making it possible to control the standardization of the waste present in the tank 30.

[0075] According to one embodiment, and as explained previously, the heating system 50 is advantageously configured to disinfect the waste to be treated present in the tank 30, preferably during their grinding, by microwave treatment. For this, the heating system 50 advantageously comprises a microwave generator configured to generate the microwaves. The heating system 50 is further configured to convey the microwaves from the generator into the tank 30, for the treatment of the waste.

[0076] Preferably, the heating system 50 is positioned on a wall of the tank 30 and is supported at least in part, and preferably in its entirety, by the tank 30.

[0077] The tank 30 has for example a body having a cylindrical shape extending along a longitudinal axis parallel and preferably coincident with the axis of rotation AL. The tank is in particular delimited by a bottom, advantageously flat, and by a side wall, preferably of circular section. The tank 30 delimits an interior volume, preferably cylindrical of revolution, receiving the waste. The tank 30 advantageously has a volume greater than or equal to 450 L. As will be seen in more detail below, the motorized pivot assembly 100 is particularly advantageous for grinding a large volume of waste.

[0078] It will be noted that in the prior art this type of waste trivialization system 1 is generally limited to a tank size 30 of less than 440L. Indeed, when the waste is placed in the tank 30 and the grinding system composed of the motorized pivot assembly 100 and the blade 40 is activated, the rotating blade 40 crushes the waste by spinning, causing vibrations. Due to the nature of the crushing systems used in the prior art, the center of gravity of the trivialization system 1 is positioned at a height from the ground of more than 50cm (centimeters). The combination of this height and the increasingly significant vibrations depending on the torque required to crush the waste for large tank volumes 30 leads to the formation of imbalance. In order to avoid imbalances, it is then necessary to have robust and bulky frames, however this solution is difficult to implement beyond a certain tank volume 30.

[0079] The present invention solves at least part of these problems by proposing a motorized pivot assembly 100 whose longitudinal dimension would be reduced while maintaining sufficient power to allow the crushing of waste, in particular for a larger tank volume 30 and therefore a larger volume of waste treated.

[0080] Indeed, in a clever manner, and according to an embodiment of the present invention, the motorized pivot assembly 100 is configured so as to integrate a hollowed-out direct-drive motor 120 allowing the integration of elements of a pivot module 110 and the direct drive of the pivot shaft 111.

[0081] The general principle of the invention is illustrated in [Fig.2] according to one embodiment of the invention and will be described below.

[0082] In particular to increase the size of the tank 30 and to avoid the chassis problems mentioned above, it is advantageous to reduce the dimensions of the motorized pivot assembly 100 and at least its dimension along the longitudinal axis z.

[0083] The invention then advantageously uses a direct drive motor 120, such as a torque motor. The use of a torque motor 120 allows the generation of high torque at constant speed. A torque motor 120 can generate a torque greater than or equal to 500Nm at speeds greater than or equal to 1000rpm; and / or a torque greater than or equal to 250Nm at speeds greater than or equal to 3000rpm. These values ​​can also be achieved with good energy efficiency, unlike other motorization solutions. The energy cost of waste disposal is therefore reduced.

[0084] The torque motor 120 advantageously has a recess 125. Equivalently, the motor 120 defines a hollow internal volume which corresponds to the recess 125 and which allows the pivot module 110 to be integrated therein at least in part. The integration of these elements allows the motorized pivot assembly 100 to be compact by reducing its dimension in the z direction, while allowing efficient grinding by rotating the blade 40.

[0085] The operation of the motor 120 drives the pivoting module into rotation. 110. The pivot module rotates the grinding blade 40 with good rigidity. This therefore allows for better compactness while maintaining a speed and torque high enough to grind the waste present in the tank 30.

[0086] According to one embodiment of the invention, the pivot module 110 comprises a pivot shaft 111 configured so as to be connected to the motor 120 to be driven in rotation around the axis A1 by the motor 120. Thus the axis of rotation A1 of the pivot shaft 111 can be substantially parallel, and preferably coincident, with the axis along which the pivot shaft 111 extends. In other words, the pivot shaft 111 extends along the axis z. More particularly, the pivot shaft 111 extends substantially in the center of the motorized pivot assembly 100. The pivot shaft 111 extends in particular partly in the recess 125 of the motor 120. Furthermore, the pivot shaft 111 extends partly outside the recess 125 allowing a connection with the blade 40. For this, for example, the pivot shaft 111 advantageously comprises an annular groove 117. The annular groove 117 can be configured so as to allow the blade 40 to be fixed.

[0087] According to one example, the pivot shaft 111 may have a cylindrical shape. The pivot shaft 111 is advantageously based on or made of metal. The pivot shaft 111 may also have one or more surface treatments configured to ensure the desired mechanical properties. Thus, the pivot shaft 111 can resist twisting under stress and deformations due to eccentricity defects.

[0088] According to one embodiment, the pivot module 110 also comprises a first bearing 112 and a second bearing 113 positioned on the pivot shaft 111.

[0089] In order to optimize the mechanical robustness of the system, during the development of the invention, the optimal location of the first bearing 112 and second bearing 113 was studied. Preferably, the motor 120 does not have its own bearings, the first bearing 112 and second bearing 113 act as bearings of the motor 120. The first bearing 112 and second bearing 113 act as connecting bearings between the pivot shaft 111 and the motor 120 and thus allow the transmission of forces from the motor 120 to the pivot shaft 111. As illustrated in [Fig.2], the mounting of the first bearing 112 can allow a ball joint connection between the frame 11' (illustrated in [Fig.l]) and the pivot shaft 111, and the mounting of the second bearing 113 can allow a sliding pivot connection between the frame 11' and the pivot shaft 111.

[0090] According to one embodiment, the first bearing 112 and the second bearing 113 are advantageously positioned on a portion 11a of the pivot shaft 111 extending from a barycenter 124 of the motor 120 towards the blade 40. Thus the first and second bearings 112, 113 are advantageously positioned on the same side of the motor 120, as opposed to an arrangement in which the bearings are arranged on the pivot shaft 111 on either side of the motor 120. During the development of the invention, it was in fact demonstrated that a conventional arrangement of the bearings on either side of the motor did not have sufficient robustness to withstand several waste trivialization cycles. Surprisingly, an arrangement on the same side of the motor 120 of the first and second bearings 112, 113, offers sufficient mechanical robustness to withstand the forces transmitted between the motor 120 and the shaft 111. This arrangement is completely counter-intuitive for those skilled in the art.

[0091] According to one example, the barycenter 124 of the motor 120, or center of mass, corresponds to the central point of the motor 120. Thanks to the motorized assembly, the barycenter 124 can be lowered in the z direction compared to the motors of the prior art, thus the center of gravity of the motorized pivot assembly 100 is lowered. The barycenter 124 is included in the median plane of the motor 120 in the longitudinal direction z. Equivalently, the first and second bearings 112, 113 are arranged on a portion 111a of the pivot shaft 111 extending from the median plane of the motor 120 in the longitudinal direction z, parallel to the axis of rotation A1 of the shaft 111, towards the blade 40. This median plane is substantially perpendicular to the axis of rotation A1 of the shaft 111.

[0092] Preferably, the second bearing 113 is positioned in the recess 125 of the motor 120. This positioning makes it possible to limit the radial forces on the second bearing 113. This positioning at least partly in the motor 120 makes it possible to make the motorized pivot assembly 100 even more compact. Preferably, the second bearing 113 is positioned at a distance d from the barycenter 124 of the motor 120. The distance d is preferably less than or equal to 45 mm. The second bearing 113 is preferably arranged as close as possible to the barycenter 124 of the motor 120, thus limiting the fatigue of the second bearing 113. The second bearing 113 is preferably positioned at a distance less than or equal to 135 mm from the blade 40.

[0093] In order not to create premature aging, it has been demonstrated that the distance from the force support point is preferably reduced. This involves reducing the distance d between the second bearing 113 and the barycenter 124 of the motor 120, as seen above, but also the distance dl between the first and second bearings 112 and 113.

[0094] Thus, preferably, the distance dl between the first bearing 112 and the second bearing 113 is less than or equal to 90 mm, preferably less than or equal to 80 mm. This distance dl is taken along the main direction of extension of the pivot shaft 111, and therefore in the z direction.

[0095] In order not to impose too much rigidity on the transmission of forces between motor 120 and pivot shaft 111, the invention preferably positions only two bearings, the first and second bearings 112, 113 and not three bearings.

[0096] The motorized pivot assembly is now detailed with reference to figures 3 to 6, according to several exemplary embodiments.

[0097] According to one embodiment, the motor 120 comprises a stator 121, a rotor 122. The motor 120 is configured so as to allow the rotor 122 to rotate using magnets 123 present in the rotor 122 and the stator 121.

[0098] According to one embodiment, the stator 121 comprises an upper face 1211, a lower face 1212 and side faces 1213. The stator has a hollow shape, and in particular a cylindrical shape. More particularly, the stator 121 defines a hollow internal volume between its upper face 1211 and its lower face 1212. It is therefore understood that the stator 121 forms a recess 125 of the motor 120. Equivalently, the recess 125 of the motor 120 extends longitudinally along the axis of rotation A1 of the pivot shaft 111 from the lower face 1212 to the upper face 1211 of the stator 121.

[0099] According to one embodiment, the stator 121 has a median plane. This median plane is positioned along the height of the stator 121, the height of the stator 121 being understood as the longitudinal direction z, parallel to the axis of rotation AL. The median plane is then substantially positioned at half the distance between the upper face 1211 and the lower face 1212 of the stator 121. The median plane comprises a central point advantageously positioned at the center of this plane and at the center of the stator 121, this point being defined as the barycenter 124 of the motor 120. The barycenter 124 is therefore positioned in the recess 125.

[0100] The rotor 122 is notably positioned in the stator 121. Advantageously, the rotor 122 is positioned with an air gap 126 between the stator 121 and the rotor 122, preferably less than 2 mm, and more preferably substantially equal to 0.7 mm. The air gap 126 is substantially the same over the entire diameter between the stator 121 and the rotor 122.

[0101] The rotor 122 starts rotating when the motor 120 is actuated. The rotation of the rotor 122 is typically enabled by the reverse polarity of the magnets 123 present in the stator 121 and the rotor 122. The rotation of the rotor 122 causes the creation of a magnetic field in the recess 125. The rotation of the rotor 122 can then cause the rotation of the pivot module 110.

[0102] The rotor 122 advantageously has a hollow shape, preferably cylindrical, allowing the integration of elements of the pivot module 110. The rotor 122 comprises an upper face 1221, this upper face 1221 of the rotor 122 is sen ably parallel to the upper face 1211 of the stator 121. The rotor 122 also comprises a lower face 1222 substantially parallel to the lower face 1212 of the stator 121 and two lateral faces 1223 substantially parallel to the lateral faces 1213 of the stator 121. It is therefore understood that the rotor 122 forms with the stator 121 the recess housing at least in part the pivot module 110.

[0103] According to one embodiment, the pivot module 110 also comprises an encoder 116. The encoder 116 is advantageously positioned on the pivot shaft 111 in order to follow the rotation speed of the latter. According to one example, the encoder 116 can be placed in the recess 125. The encoder 116, according to this example, is preferably positioned outside the rotor 122 to avoid the effects of the magnetic and electric field of the motor 120.

[0104] According to one embodiment, the pivot module also comprises lubrication casings 115. The lubrication casings 115 are positioned on the pivot shaft 111. Thus, the lubrication casings 115 can be positioned in the recess 125. The lubrication casings 115 are connected to the first 112 and second 113 bearings in order to ensure increased longevity of the pivot module 110.

[0105] According to one embodiment, the motorized pivot assembly 100 is included in the bell 10 for example illustrated in [Fig.8]. To do this, the bell 10 comprises a part 12 delimiting an internal volume configured to accommodate the motor 120 and partly the pivoting module 110. According to one example, the part 12 is cylindrical and has a central axis of the cylinder extending in the z direction, preferably in a manner coincident with the axis of rotation A1 of the pivoting shaft 111. The bell 10 may further comprise a plate 11. The plate 11 of the bell 10 advantageously allows the support at least in part of the tank 30. The bell 10 may also comprise the frame 11' configured to allow cooperation between the pivoting module 110 and the tank 30. The frame 11' may extend in the z direction, preferably in a manner coincident with the axis of rotation A1 of the pivoting shaft 111.The frame 11' can extend by laterally surrounding the first 112 and second 113 bearings. The frame 11' is fixed integrally to the plate 11. Thus the bell 10 can be a single piece formed by the part 12, the plate 11 and the frame 11'. The bell 10 can thus be included in the banalization system.

[0106] According to one embodiment, the bell 10 advantageously comprises cooling sleeves 114, as illustrated in Figures 3 to 6. The cooling sleeves 114 then allow the motor to be cooled to avoid overheating and thus preserve the longevity of the motorized pivot assembly 100.

[0107] Advantageously, the bell 10 is fixed to the pivot assembly 100 in order to allow the motorized pivot assembly 100 to be moved easily. For this, the bell 10 can be fixed by screws 70 (illustrated in [Fig.5]) to the upper face 1211 of the stator 121. The bell 10 can thus be assembled to the pivot assembly 100 but also disassembled to facilitate maintenance of the pivot assembly 100.

[0108] The first and second bearings 112, 113 are now described according to a particular exemplary embodiment with reference to [Fig.7]. According to one example, the first and second bearings 112 and 113 are advantageously bearings having a circular section and having a bore diameter d2 corresponding to the diameter of the pivot shaft 111. The bore diameter d2 is preferably less than 70 mm, preferably equal to 65 mm. According to one example, each of the first and second bearings 112 and 113 are roller bearings. For guiding the pivot shaft 111, the first and second spherical bearings 112 and 113 preferably have rollers associated in pairs in opposition 112a, 112b, 113a, 113b, and are advantageously mounted so as to simplify assembly. The rollers 112a, 112b, 113a, 113b can advantageously be mounted around the pivot shaft 111 according to a principle allowing axial thermal expansions.This geometry of the first and second bearings 112, 113 makes it possible to obtain a limit rotation speed of 2500 rpm and a significant service life for the motorized assembly 100 with a reliability calculated at 99.9% for a rotation speed of the motor 120 preferably at 1200 rpm.

[0109] According to one embodiment, the pivot module 110 further comprises a coupling member 118 making it possible to connect the motor 120, and more particularly the rotor 122, to the pivot shaft 111. The coupling member 118 is preferably positioned in the recess 125 of the motor 120.

[0110] The coupling member 118 allows, following the rotation of the rotor 122, the rotation of the pivot shaft 111 and therefore of the blade 40. The coupling member 118 therefore allows the motor 120 to be connected to the blade 40 and thus allows optimal transmission of the motor torque 120. For this, the coupling member 118 can extend perpendicular to the extension axis of the pivot shaft 111 between the pivot shaft 111 and the rotor 122. Equivalently, the coupling member 118 extends in the plane (x,y).

[0111] The dimensioning of the coupling distance 118 between the rotor 122 and the pivot shaft 111 is preferably reduced to a minimum. For this, the coupling member 118 extends for example over a distance substantially less than or equal to 60 mm. If the dimensioning is not adequate, additional radial forces will be applied to the first and second bearings 112 and 113, thus impacting the operating life of the latter. The coupling member 118 is advantageously made of steel, for example XC48 or 40CMD8. The coupling member 118 may have a surface treatment making it possible to improve the mechanical properties of these alloys. The coupling member 118 may have a hardness range preferably between 60 HRC (Rockwell hardness scale) and 75 HRC, and preferably a hardness of 60 HRC. The choice of the material of the coupling member 118 makes it possible to guarantee the rigidity of the motorized pivot assembly 100. The material of the coupling member 118 is advantageously chosen to minimize the cost.

[0112] The coupling member 118 has two embodiments which will be described in the following paragraphs.

[0113] First embodiment of the coupling of the motor 120 with the pivot shaft 111:

[0114] According to a first embodiment, illustrated in Figures 3 and 4, the coupling member 118 is connected to a portion 111b (illustrated in [Fig.3]) of the pivot shaft 111 located between the barycenter 124 and the bottom of the recess 125, corresponding more particularly to the plane of the lower face 1212 of the stator 121.

[0115] According to this embodiment, the coupling member 118 delimits with the rotor 122 an internal volume partly accommodating the pivot shaft 111 and the second bearing 113.

[0116] According to this embodiment, the coupling member 118 is preferably assembled integrally with the pivot shaft 111. The assembly between the coupling member 118 and the pivot shaft 111 is preferably carried out by keying and screwing. Thus, this assembly allows a translational stop between the coupling member 118 and the pivot shaft 111.

[0117] The coupling member 118 comprises an upper face 1181 and a lower face 1182. The coupling member 118 is thus advantageously connected by a portion of its upper face 1181, for example its upper periphery, with the lower face 1222 of the rotor 122. The assembly between the upper face 1181 of the coupling member 118 and the lower face 1222 of the rotor 122 is preferably carried out in a removable manner. Thus, the assembly is preferably carried out by screwing using the screws 71.

[0118] According to this embodiment, the lubrication casings 115 can extend longitudinally, that is to say along the extension axis of the pivot shaft 111, between the second bearing 113 and the coupling member 118.

[0119] According to this embodiment, the encoder 116 can be positioned outside the recess 125. The positioning of the encoder 116 outside the recess 125 implies that this embodiment does not have an optimal configuration in terms of compactness along the z direction. However, this embodiment has the advantage that the encoder 116 is not subjected to the magnetic field present in the recess 125.

[0120] Second embodiment of the coupling of the motor 120 with the pivot shaft 111:

[0121] According to a second embodiment illustrated in Figures 5 and 6, the coupling member 118 is connected to the portion 11a of the pivot shaft 111, located between the barycenter 124 and the top of the recess 125 corresponding to the plane of the upper face 1211 of the stator 121. Preferably, the coupling member 118 is removably mounted on the pivot shaft 111. The assembly between the coupling member 118 and the pivot shaft 111 can for this purpose be achieved using a pin 119a and a nut 119b.

[0122] This embodiment facilitates maintenance of the system. Indeed, disassembly of the pivot assembly 100 to access the first and second bearings 112, 113 can be easily carried out, as described in more detail below. This disassembly of the pivot assembly 100 allows maintenance of the bearings without damaging the motor 120.

[0123] According to this embodiment, the coupling member 118 may have three portions 118a, 118b and 118c. The central portion 118b is mounted around the portion 11a of the pivot shaft 111 and has a recess allowing the integration of the second bearing 113 and the casings 115 present on the pivot shaft 111. According to this embodiment, the coupling member 118 may also have an upper face 1181 and a lower face 1182. The lower face 1182 of the coupling member 118 is preferably removably connected to the upper face 1221 of the rotor 122 at at least one and preferably each of the ends of the portions 118a and 118c. Preferably, the lower face 1182 of the coupling member 118 is connected by screwing using screws 71 to the upper face 1221 of the rotor 122 at one of the ends of the portions 118a and 118c.The other end of portions 118a and 118c is preferably connected to portion 118b.

[0124] Furthermore, the modification of the location of the coupling member 118 allows the integration of the encoder 116 into the recess 125 of the motor 120 and makes the motorized pivot assembly 100 even more compact than the previous embodiment. Insulation adjustments on the encoder 116 can be implemented due to the presence of strong magnetic and electric fields in the recess 125.

[0125] Thus, the height under the tank 30 of the motorized pivot assembly 100 is further reduced with a height less than or equal to 200 mm.

[0126] According to this embodiment, the lubrication casings 115 are flat and therefore have a reduced longitudinal section compared to the previous embodiment. This reduction in the size of the casings 115 allows an increase in the space present in the recess 125, in synergy with this placement of the coupling member 118.

[0127] The maintenance of the motorized pivot assembly 100 will now be described in more detail.

[0128] Maintenance of the motorized pivot assembly 100:

[0129] An example of maintenance of the invention is described according to the embodiment of the invention illustrated in [Fig.6], implementing the motorized pivot assembly according to the example illustrated in [Fig.5].

[0130] According to one embodiment, a coupling lug 80 will preferably be fixed before maintenance between the rotor 122 and the stator 121, to prevent these two elements from coming into contact when handling the motor 120. The rotor 122 is thus held in position allowing the air gap 126 to remain fixed.

[0131] This tab 80 can be placed between the rotor 122 and the cooling sleeves 114 included in the bell 10. The tab 80 can also be placed between the rotor 122 and the stator 121. This fixing will preferably be carried out by screwing using the screws 72.

[0132] The bearings can then be accessed from the upper side of the motor 120. To do this, the screws 70 connecting the stator 121 and the plate 11 of the bell 10 can be removed, preferably once the coupling lug 80 is fixed. The pin 119a and the nut 119b can also be removed in order to be able to separate the pivot shaft 111 and the coupling member 118.

[0133] Maintenance can then be carried out optimally by limiting the risk of damaging the motor 120, the air gap 126 of which must remain fixed. In addition, this removable attachment of the coupling member 118 makes it possible to facilitate the maintenance of the first and second bearings 112, 113 and thus to improve the reliability of the system. The first and second bearings 112, 113 being positioned on the upper part and on the same side of the motor 120, and in synergistic manner with the characteristic according to which the coupling member 118 is configured so as to be mounted on an upper surface of the rotor 122, maintenance is facilitated by allowing access to the first and second bearings 112, 113 through the upper part of the motor 120.

[0134] Method for starting up the waste trivialization system 1:

[0135] Thus the method of using a pivot assembly 100 in a ba system finalization of waste 1 allows the crushing of waste and includes: - an introduction into the tank 30 of waste from healthcare activities with infectious risks, - grinding of introduced waste, comprising a rotational drive of the pivot shaft 111 by the direct-drive motor 120, inducing a rotation of the grinding blade 40 around an axis of rotation substantially parallel, and preferably coincident, with the main extension direction of tree 111.

[0136] According to one embodiment, the motor 120 is configured to drive the pivot shaft 111 at a rotation speed greater than or equal to 1000 rpm, preferably greater than or equal to 1200 rpm.

[0137] Indeed, the necessary torque is a function of the grinding capacity of the machine. In order to be able to increase the size of the tank 30 while keeping a compact system, the motor 120 must have a sufficient rotation speed to drive the blade 40 and grind the waste.

[0138] The invention is not limited to the embodiments previously described and extends to all embodiments covered by the invention. Many other variant embodiments are possible, for example by combining features previously described, without departing from the scope of the invention. Furthermore, the features described in relation to one aspect of the invention may be combined with another aspect of the invention.

[0139] DIGITAL REFERENCES 1: waste trivialization system 10: bell 11: tray 11': frame 12: cylindrical part 20: electrical connection box 30: tank 40: blade 50: heating system 60: computerized means of control 70: bell / stator fixing element 71: coupling member / rotor fixing element 72: rotor fixing element / immobilizing paste 80: rotor immobilizing tab 90: chassis 100: motorized pivot assembly 110: pivot module 111: pivot shaft 11 la: portion of pivot shaft 111b: portion of pivot shaft between the barycenter and the bottom of the recess 112: first roll 112a, 112b: two rollers mounted in X 113: second bearing 113a, 113b: two rollers mounted in X 114: cooling sleeve 115: lubrication housing 116: encoder 117: annular groove 118: coupling organ 118a: first portion of the coupling member 118b: second portion of the coupling member 118c: third portion of the coupling member 119a: pin 119b: nut 120: engine 121: stator 122: rotor 123: magnets 124: engine barycenter 125: engine recess 126: air gap 1181: upper face of the coupling member 1182: lower face of the coupling member 1211: upper face of the stator 1212: lower face of the stator 1213: side face of the stator 1221: upper face of the rotor 1222: upper face of the rotor 1223: side face of the rotor d: bearing-barycenter distance dl: distance between the two bearings d2: bore diameter Al: axis of rotation

Claims

Claims

1. Motorized pivot assembly (100) for a blade of a waste trivialization system, in particular waste from infectious health care activities, comprising: • a pivot module (110) comprising: - a pivot shaft (111), intended to rotate a blade (40) of a waste trivialization system (1), around an axis of rotation substantially parallel to the main extension direction of the shaft (111), - a first bearing (112) and a second bearing (113), each arranged around the pivot shaft (111), • a motor (120) configured to rotate the pivot shaft (111), the motor (120) having a barycenter (124), characterized in that the motor (120) is a motor with direct drive of the pivot shaft (111), the motor (120) comprising a recess (125) configured to accommodate at least in part the pivot module (110),and in that the first and second bearings (112, 113) are each arranged on a portion (11a) of the pivot shaft (111) extending from the barycenter (124) of the motor (120) towards the blade (40).,

2. Motorized pivot assembly (100) according to the preceding claim in which the second bearing (113) is positioned at least in part, in the recess (125) of the motor (120).

3. A motorized pivot assembly (100) according to any preceding claim, wherein the second bearing (113) is positioned at a distance (d) from the barycenter (124) of the motor (120), the distance (d) being less than or equal to 45 mm.

4. A motorized swivel assembly (100) according to any preceding claim, wherein the swivel module (110) further comprises a coupling member (118) disposed at least partly, and preferably entirely, in the recess (125) of the motor (120) and wherein the motor (120) comprises a stator (121) and a rotor (122), the rotor (122) being configured to directly drive the pivot shaft (111) in rotation via the coupling member (118).

5. Motorized pivot assembly (100) according to the preceding claim, in which the coupling member (118) extends between the pivot shaft (111) and the rotor (122), in a main extension plane substantially perpendicular to the axis of rotation of the pivot shaft (111), over a distance substantially less than or equal to 60 mm.

6. A motorized pivot assembly (100) according to any one of the two preceding claims, wherein the coupling member (118) is configured to be connected to an upper surface (1221) of the rotor (122).

7. A motorized swivel assembly (100) according to any one of the three preceding claims, wherein the coupling member (118) is removably attached to the rotor (122), for example by screwing, and the coupling member (118) is removably attached to the swivel shaft (111), for example by a pin (119a) and a nut (119b).

8. Motorized pivot assembly (100) according to any one of the preceding claims, wherein the motor (120) is configured to drive the pivot shaft (111) at a rotational speed greater than or equal to 1000 rpm, preferably greater than or equal to 1200 rpm.

9. Motorized pivot assembly (100) according to any one of the preceding claims, wherein the distance (dl) between the first bearing (112) and the second bearing (113) is less than or equal to 90 mm, preferably less than or equal to 80 mm.

10. A motorized swivel assembly (100) according to any preceding claim, wherein the first bearing (112) and the second bearing (113) are spherical roller bearings mounted around the swivel shaft (111), the first bearing (112) being configured to provide a swivel connection around the swivel shaft (111), and the second bearing (113) being configured to provide a sliding pivot connection around the swivel shaft (111).

11. A motorized swivel assembly (100) according to any preceding claim, wherein the assembly (100) further comprises an encoder (116) configured to measure a rotational speed of the swivel shaft (111), the encoder (116) being disposed at least partially within the recess (125) of the motor (120).

12. Waste trivialization system (1), in particular waste of infectious risk care activities, comprising a tank (30) intended to be supplied with waste, the motorized pivot assembly (100) according to any one of the preceding claims, a waste crushing blade (40) arranged inside the tank (30), the blade (40) being configured to be driven in rotation around an axis of rotation substantially parallel, and preferably coincident, with the main direction of extension of the shaft (111) by the motorized pivot assembly (100), the tank (30) having a volume greater than or equal to 450 L.

13. Waste trivialization system (1) according to the preceding claim, further comprising a heating system (50), preferably by microwave, of the waste for the purpose of disinfecting it, positioned on the tank (30).

14. Grinding method implementing the waste trivialization system (1) according to any one of claims 12 to 13 comprising: • an introduction into the tank (30) of infectious risk healthcare waste, • a grinding of introduced waste, comprising a rotational drive of the pivot shaft (111) by the direct drive motor (120), inducing a rotation of the grinding blade (40) around an axis of rotation substantially parallel, and preferably coincident, with the main direction of extension of the shaft (111).

15. Grinding method according to the preceding claim, wherein the blade (40) is configured to be driven by the pivot shaft (111) at a rotation speed greater than or equal to 1000 rpm, preferably greater than or equal to 1200 rpm.

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