543 results about "Hydraulic circuit" patented technology

The invention discloses a hydraulic system sealing test bench and a sealing performance test method, and belongs to the technical field of sealing performance detection, the test bench comprises a vibration device, a pressure control system, a sealing element installation device, a flow adjusting system and a micro leakage detection unit; a to-be-tested sealing element is installed in the sealing element installation device to form a sealing cavity, and the sealing cavity is communicated with the pressure control system, the flow adjusting system and the hydraulic oil tank through pipelines to form a closed hydraulic loop. The vibration device is arranged on the outer side of the sealing element mounting device and used for applying vibration loads, the pressure control system is used for providing and adjusting hydraulic pressure in the sealing cavity, the flow adjusting system is used for controlling the flowing speed and flow of a hydraulic medium, and the micro-leakage detection unit is arranged below the sealing element mounting device and used for detecting leakage of the sealing cavity. The method has the advantages of being high in test condition controllability, high in leakage detection sensitivity, wide in adaptability and high in test result engineering guidance.

A hydraulic drive apparatus includes a hydraulic pump that discharges a working fluid; a flow dividing valve that divides a pump passage connected to the hydraulic pump into first and second passages, and changes an opening degree of each passage according to a signal that is input to the flow dividing valve; a travel system hydraulic circuit that is connected to the first passage and controls a flow of the working fluid to a travel motor; a loading system hydraulic circuit that is connected to the second passage and controls a flow of the working fluid to a loading actuator; a pressure sensor that detects a pressure supplied to the travel motor; and a control device that controls, by outputting the signal to the flow dividing valve, the opening degree of the first and second passages according to the pressure detected by the pressure sensor.

The invention discloses an automatic design and optimization system for a hydraulic speed control loop, which takes a large language model intelligent body as a core, realizes automatic design and optimization of the hydraulic speed control loop through semantic comprehension, knowledge retrieval and parameter optimization, and specifically comprises an LLM intelligent body, a data processing module and a data processing module, the analysis module is used for analyzing natural language input containing design requirements and performance targets of a user, generating a loop structure in combination with a local knowledge base and calling an optimization algorithm; the local knowledge base comprises a basic hydraulic loop, a key empirical relationship and a typical structure template which are artificially extracted; and the simulation and optimization module is used for executing a swarm intelligence optimization algorithm to optimize and adjust parameters of the loop structure. The invention constructs a hydraulic speed control loop automatic design and optimization system with semantic understanding, automatic generation and adaptive optimization capabilities, and aims to realize full-process intelligent design from user demand input to loop structure generation and performance optimization.

The underlying invention relates particularly to a hydraulic forming machine, more particularly a forging hammer, for workpiece forming, comprising a hydraulic cylinder for driving a ram configured for workpiece forming, and a hydraulic circuit configured for operation of the hydraulic cylinder, wherein the hydraulic circuit has an actuator with an adjustably variable volume flow via which a first hydraulic working chamber of the hydraulic cylinder, used to accelerate the ram during the execution of a working stroke (A) for workpiece forming, can be provided with hydraulic fluid. The hydraulic circuit is configured to adjust and vary the volume flow of the valve or actuator, depending on a setpoint speed (Vsoll) of the ram to be achieved in an acceleration phase of a working stroke (A), and to optimize the subsequent movement phase.

An electric drive for a vehicle comprises a housing, an electric machine with a stator connected to the housing and including stator end-windings, a rotor rotatable relative to the stator, and a driveshaft connected to the rotor and rotatably supported in the housing about an axis of rotation, a transmission to transmit a rotary movement from the driveshaft to drive a driveline of the vehicle, and a hydraulic circuit for circulating a fluid.

The invention provides a multi-station servo drive hot press molding composite production device, which belongs to the technical field of hot press molding, and comprises a hot press molding base, the side edge driving sliding rails are arranged at the two side ends of the hot press molding base; the lower forming plate is arranged at the upper end of the hot press forming base; the hydraulic fixing assemblies are arranged, each hydraulic fixing assembly comprises a side edge forming clamping sleeve, a reset sliding groove, a reset push plate, a clamping reset spring, a pressurizing sliding rod, a side edge forming clamping plate, a hydraulic groove and a sealing ring, and the side edge forming clamping sleeves are slidably connected to the side inner walls of the side edge driving sliding rails. The hydraulic grooves are formed in the side edge forming clamping sleeves, hydraulic oil is arranged in the hydraulic grooves, and a hydraulic loop is automatically closed in the descending process of the hot-pressing main pressing plate, so that the side edge clamping plates are seamlessly switched into a high-strength locking state from an initial buffering clamping state.

The invention discloses a reciprocating type passenger ropeway constant deceleration control system, and relates to the technical field of brake control. According to the method, the first-stage constant deceleration braking mode and the second-stage constant torque braking mode are set, analysis is carried out through the second-stage braking conversion algorithm, the deceleration abnormal index, the speed tracking abnormal index and the response abnormal index are output, then the mode abnormal total value is obtained, the braking state is judged, self-adaptive mode switching is achieved, and the braking efficiency is improved. Constant braking deceleration is maintained, swinging of a hanging box is reduced, comfort of passengers is improved, brake rubber abrasion is reduced, meanwhile, regional debugging is not needed, and the operation difficulty of a construction site is reduced; hydraulic loop parameters are analyzed through a failure judgment logic algorithm set by the hydraulic redundancy protection module, a loop abnormal total value is output, and hydraulic loop switching is carried out based on the loop abnormal total value; and through visual display of the fault memory interaction module, the safety redundancy of the braking system is improved, fault tracing and maintenance are facilitated, and the running reliability of the cableway is guaranteed.

The invention discloses a bidirectional and horizontal action hydraulic capstan test device and method, and belongs to the technical field of test bench testing and test equipment. The device comprises a supporting seat, a hydraulic capstan and a load oil cylinder, the load oil cylinder adopts a unique structure that a piston rod is fixed and a cylinder body can move bidirectionally, and two ends of the cylinder body are connected with the hydraulic capstan winding drum through two steel wire ropes with opposite winding directions. The core is a set of hydraulic loop integrating an electric proportional overflow valve and four one-way valves: when a cylinder body is pulled, oil in a pressed cavity needs to return through the electric proportional overflow valve, and the simulation load force can be accurately controlled by setting the pressure of the valve through an electric signal; meanwhile, the loop can automatically supplement oil to the negative pressure cavity, vacuum is prevented, and stable load is ensured. The problem that in the prior art, a variable load cannot be provided for a bidirectional and horizontal acting hydraulic capstan is solved, precise and stable simulation of a single oil cylinder on a bidirectional load is achieved, and the hydraulic capstan load simulation device has the advantages of being compact in structure, precise in control, safe and reliable.

The invention relates to a hydrostatic driving speed regulation system, method, equipment and medium for a harvester, and relates to the technical field of mechanical driving speed regulation, the system comprises a closed hydraulic loop composed of a walking pump and a variable displacement motor, the walking pump is driven by an engine, and a two-position four-way proportional reversing valve group is arranged on the hydraulic loop; a rotating speed sensor is mounted on the variable displacement motor; the controller is used for acquiring real-time state information of the harvester and determining a speed regulation control strategy based on the real-time state information, and the speed regulation control strategy is a first control strategy or a second control strategy; and the speed regulation control strategy is sent to a two-position four-way proportional reversing valve set, so that the two-position four-way proportional reversing valve set adjusts the displacement of the walking pump and the displacement of the variable displacement motor according to the speed regulation control strategy. The technical effects that the speed regulation control strategy is accurately determined according to the real-time state information of the harvester, the displacement of the walking pump and the displacement of the variable displacement motor are reasonably adjusted, and the driving speed regulation requirements of the harvester under different working conditions are met are achieved.

An agricultural system includes a header comprising a gauge wheel and a frame, in which the gauge wheel and the frame are coupled to a hydraulic cylinder that is configured to adjust the gauge wheel relative to the frame. The agricultural system also includes a hydraulic circuit fluidly coupled to the hydraulic cylinder, in which the hydraulic circuit is configured to control a fluid flow into and out of the hydraulic cylinder to adjust the gauge wheel relative to the frame, and the hydraulic circuit includes an accumulator configured to enable an amount of fluid in the hydraulic cylinder to change during a harvesting operation of the agricultural system such that the gauge wheel may oscillate from a set position during the harvesting operation.

The present invention relates to an agricultural implement, in particular for soil tillage, comprising: an implement frame comprising a base frame and at least one tool frame, wherein the tool frame is arranged on the base frame so as to be foldable about a folding axis, in particular laterally with respect to the base frame, and so as to be pivotable about a pivot axis, in particular in an implement longitudinal direction; an actuator system arranged on the implement frame for moving the tool frame between a working position and a transport position, wherein the actuator system comprises at least one first cylinder unit for, in particular laterally, folding the tool frame about the folding axis and a second cylinder unit for pivoting the tool frame about the pivot axis; and a hydraulics system having at least one hydraulics circuit for actuating the actuator system. According to the invention, the at least one first cylinder unit and the second cylinder unit are connected to the same hydraulic circuit, wherein the hydraulic system is designed such that the tool frame is pivoted, in particular from the working position in the direction of the transport position, about the folding axis depending on a pivot angle of the tool frame about the pivot axis.

A single shaft suspension system includes right and left dampers, first and second hydraulic circuits, a first pressurization mechanism in fluid communication with the first and second hydraulic circuits, and a second pressurization mechanism connected in series with the first pressurization mechanism. The first pressurization mechanism is a cycloid pump and provides roll control by generating a pressure difference between the first hydraulic circuit and the second hydraulic circuit, which raises the fluid pressure in the first working chamber of the right damper and the second working chamber of the left damper. Or hydraulic pressure within the first working chamber of the left damper and the second working chamber of the right damper to provide stiffness against roll of the vehicle while turning. The second pressurization mechanism regulates static pressure within the first hydraulic circuit and the second hydraulic circuit by adding hydraulic fluid to and removing hydraulic fluid from the first hydraulic circuit and the second hydraulic circuit.

To provide a hydraulic circuit that includes a hydraulic distribution module and at least one hydraulic regulator device that can manage the primary flow.SOLUTION: A distribution module 102 comprises a spool 11, 21 including an inlet recess 111, 121 and a drain recess 112, 122. The inlet recess and the drain recess are configured such that the flow rate of fluid that enters the utility E1, E2 is equal to or less than the flow rate of fluid that exits the utility. Further, a first driving channel 31 and a second driving channel 32 are provided respectively, so that a pressure obtained upstream of the drain recess acts on a first side 21a, 22a of a three-way regulator device 21, 22, and so that a pressure obtained downstream of the drain recess in the first driving channel acts on a second driving-channel side 21b, 22b of the three-way regulator device, and an additional force.SELECTED DRAWING: Figure 1

The present invention relates to a method for operating a hydrostatic drive system of a mobile working machine, wherein the hydrostatic drive system comprises a hydraulic pump (12) with adjustable delivery volume and at least one hydraulic motor (3) connected to each other in a hydraulic circuit, wherein the hydraulic pump (12) is driven by a drive motor and the at least one hydraulic motor (3) is configured to drive a wheel of the mobile working machine, characterized in that the method comprises the following steps: a) Determining a speed that corresponds to the actual speed of the mobile working machine or to a quantity dependent on it; b) Determining a target speed value that represents a target value for the speed recorded in step a); c) Control of the speed recorded in step a) taking into account the speed setpoint determined in step b) by changing a control variable for the hydraulic pump (12) while a defined speed of the drive motor is requested; d) Increasing the load exerted on the drive motor by the drive system, while in step c) the speed is regulated; e) Storing the current value of the control variable for the hydraulic pump (12) when, during the increase of the load in step d), it is determined that an operating variable of the drive motor or an operating variable of the hydrostatic drive has reached a first target value.

An actuation system (1) for adjusting the pitch of the fan blades (20) of an aircraft engine, comprising a hydraulic power supply (3), a hydraulic cylinder (5), and a hydraulic circuit including a hydraulic channel equipped with a check valve (43) and a distribution valve (41) adapted to selectively adopt two configurations, such that when the distribution valve (41) is in the first configuration, the hydraulic cylinder (5) is configured to be position-controlled by the hydraulic power supply (3), and when the distribution valve (41) is in the second configuration, the control fluid can only flow from a retraction chamber (5f) to an extension chamber (5c) so that the piston of the hydraulic cylinder (5) moves in the first direction of travel, the fan blades orienting themselves towards a safety position known as the "feathered position." Figure for the abstract: Fig. 5

The present invention relates to a multi-connection plate device (1) of the cam (150) and lever (160) type for simultaneously connecting a plurality of hydraulic lines for pressurized fluids and electrical connectors. The device comprises a fixed multi-connection element (100, 300) in turn comprising a first plate element (101, 301) supporting a plurality of female couplings (10) for connection to the hydraulic circuit of an operating machine, and a second movable multi-connection element (200) in turn comprising a second plate element (201) supporting a corresponding plurality of male couplings (20) suitable for connection to the hydraulic circuit of a utility, said multi-connection device (100, 300), the device further comprising a closure cover (109, 309) movable between an open position in which said plurality of female couplings (10) located on said first plate element (101) are accessible from the outside, and a closed position in which said plurality of female couplings (10) located on said first plate element (101) are not accessible from the outside, and further comprising, associated with said first plate element (101, 301), at least a first connection plate (103), suitable for inserting into a connector holder element (130), or into a secure body (339), comprising a lid closure device.

The invention relates to an anti-lock device (1) for a wheel, which is arranged in a hydraulic pressure circuit between a master cylinder (2) and at least one brake caliper (3) of the wheel, in particular for an aircraft. According to the invention, the device comprises: a centrifugal element (4) attached to a rim (5) of the wheel and movable from a retracted position when the wheel is rotated at a speed below a threshold rotational speed to a deployed position due to centrifugal force when the wheel is rotated at a speed beyond the threshold rotational speed; a pressure regulating system (6) comprising a hydraulic inlet (6a) connected to the master cylinder (2) and a hydraulic outlet (6b) connected to the hydraulic inlet of the brake caliper (3), the pressure regulating system (6) is movable between a hydraulic circuit closed position when the centrifugal element (4) is in the retracted position and a hydraulic circuit open position driven by the centrifugal element (4) in the deployed position.

This invention relates to a stackable hydraulic circuit assembly, comprising: a hydraulic circuit plate including one base plate and n stacking plates; the top surface of the base plate and the bottom and top surfaces of the stacking plates are provided with oil inlet ports and oil return ports, and the base plate and the n stacking plates are sequentially fixedly connected via the bottom and top surfaces; a valve mounting interface including multiple valve holes, disposed on the same side of the hydraulic circuit plate; top fixing seats protruding laterally on both sides of the top surfaces of the base plate and the stacking plates, and bottom fixing seats protruding laterally on both sides of the bottom surfaces of the stacking plates; when the top fixing seats and adjacent bottom fixing seats are directly opposite each other, the top fixing seats and bottom fixing seats can be fixedly connected to each other by fasteners; the ratio of the cross-sectional area of ​​the oil inlet port to the valve hole and the ratio of the cross-sectional area of ​​the oil return port to the valve hole are both approximately positive integers k. This facilitates ensuring the optimal flow rate of hydraulic oil, allows for arbitrary expansion of the number of groups, and results in a smaller hydraulic circuit assembly with lower material costs.

This invention relates to a hydraulically driven humanoid robot pelvis, within the field of humanoid robots. It addresses the problems of complex structure and large size in existing hip joint pelvic structures. The pelvic support frame integrates printed hydraulic circuits. A lumbar joint base is mounted on one side of the pelvic support frame along its length. Two hip joint mounts are symmetrically mounted on either side of the pelvic support frame along its width, with the axis of the hip joint mounts aligned with the width of the pelvic support frame. The thickness of the pelvic support frame is less than the outer diameter of the hip joint mounts. A lumbar joint is mounted on the lumbar joint base and drives the pelvic skeleton to achieve posture adjustment. Each hip joint mount contains one hip joint, enabling roll and yaw movements. Each hip joint is connected to a thigh, and the pitch movement of the pelvic skeleton is achieved through the drive of a hydraulic cylinder on the thigh. This invention is applicable to robots that need to carry heavy objects or perform tasks requiring great strength.

A lift device and a method of controlling the lift device are provided. The lift device has an electric motor drivingly coupled to a traction device, and a traction battery. A hydraulic circuit has a pump with a pump motor, and a valve. In response to a voltage being above a threshold voltage while the electric motor is outputting a braking torque and providing electrical power to the battery, flow of the pump is increased and the valve is controlled to reduce a size of the valve opening and increase pressure in the pressure galley thereby reducing electrical power to the traction battery. The flow of the pump and the valve position are therefore controlled in response to a braking power output being greater than a threshold to dissipate braking power output into the hydraulic circuit and charge the traction battery with the remaining braking power output.

This invention relates to the field of wind power generation technology, specifically to a hydraulic control structure, a wind turbine yaw system, a control method, and a wind turbine generator set. The hydraulic control structure is suitable for connection to a yaw brake hydraulic circuit. The hydraulic control structure is configured such that: when the average wind speed within a preset time is greater than a preset wind speed, the output pressure of the hydraulic control structure is maintained at a preset pressure; and / or, when the average wind speed within a preset time is less than a preset wind speed and the power of the wind turbine generator set is less than a preset power, the output pressure of the hydraulic control structure changes proportionally between zero and the preset pressure. This invention can adjust the output pressure of the hydraulic control structure according to the wind speed, ensuring yaw stability, reducing wear on the yaw brake, and extending its service life.

The invention provides a parallel hydraulic interconnection damping catamaran which comprises an upper cabin, a hydraulic interconnection suspension and a floating body which are sequentially arranged from top to bottom, and the whole structure is symmetrically distributed in the front view and is trapezoidal in the left view. The hydraulic interconnection suspension forms two side waists of a trapezoid, the upper cabin body is connected with the transverse rocker arm through the hydraulic cylinder set, the front transverse rocker arm is hinged to the longitudinal rocker arm through the radial spherical plain bearing, the longitudinal rocker arm is hinged to the floating body through the radial spherical plain bearing, and the rear transverse rocker arm is directly connected with the floating body. The front hydraulic cylinder set and the rear hydraulic cylinder set stretch out and draw back to achieve pitching motion, the left hydraulic cylinder set and the right hydraulic cylinder set stretch out and draw back alternately to drive the floating bodies on the two sides to move in a staggered mode, heeling of the ship body is achieved, and therefore three-freedom-degree vibration reduction compensation of heaving, pitching and heeling is jointly completed. Through the eight-cylinder interconnected hydraulic loop design and the special connection pair layout, wave multi-degree-of-freedom impact is effectively decoupled, the seakeeping and stability of the ship are remarkably improved, and the device is suitable for special rescue scenes such as shallow water areas and complex channels.

The present invention relates to an assembly or kit for adjusting agricultural machinery for deep soil conditioning or soil decompaction processes with a variable depth setting, suitable for being incorporated into new or existing agricultural machinery, such as decompactors, subsoilers, chisel ploughs, paratill ploughs, weeders and the like, which is characterised in that it comprises a hydraulic control device interposed in the hydraulic circuit of said agricultural machinery, usually between the hydraulic fluid pressure pump and the actuators, which are usually hydraulic; and a programmable control device, which contains stored information about the ground to be worked, such as moisture, compaction level and other parameters of interest for the task, and which is programmed to determine the depth of penetration of the agricultural implement of the machinery into the soil based on said parameters.

A filter press (100) comprising: a plurality of filter chambers (155), each of which is delimited by two mutually facing filter septa (140, 145) interposed between a pair of containment panels (105); a mobile device suitable to move each pair of containment panels (105) between a closed configuration and an open configuration; an inlet hydraulic circuit of the liquid to be filtered; an outlet hydraulic circuit of the filtered liquid; and a washing robot (400) suitable to wash the filter septa (140, 145) delimiting each filter chamber (155). Wherein the washing robot (400) comprises: a trolley (405) suitable to move along a longitudinal direction (A) with respect to the containment panels (105); a bar (445) mounted on the trolley (405) and movable with respect to the trolley (405) in a transverse direction with respect to the longitudinal direction (A); and a plurality of nozzles (450) mounted on the bar (445) to dispense jets of washing liquid towards the filter septa (140, 145). The filter press further comprises: a plurality of identification codes, each of which is fixed to at least one respective filter septum (140, 145); means for detecting the identification codes mounted on the trolley (405) of the washing robot (400); at least one image acquisition device (600) mounted on the bar (445) of the washing robot (400) to acquire images of the filter septa (140, 145); and an electronic processing unit connected to the identification code detection means and to the image acquisition device (600).

The invention relates to a domestic dishwasher (1) having a washing container (2) for receiving items (G) to be washed, a hydraulic circuit (33) for circulating washing liquid and / or fresh water (F) in the washing container (2), and a pump device (19) for applying washing liquid and / or fresh water (F) to the hydraulic circuit (33), the pump device (19) having a central axis (20) which is oriented in the direction of gravity (g), the pump device (19) has a water distributor (23) integrated in a housing (35) of the pump device (19) for selectively distributing washing liquid and / or fresh water (F) to a plurality of fluid outlets (51, 52, 53, 54) of the pump device (19), and wherein all of the fluid outlets (51, 52, 53, 54) are oriented along the central axis (20).

To suppress noise during pressure holding without modifying an interface of a host control device and a hydraulic control device.SOLUTION: This hydraulic control device 14 is provided with a hydraulic pump 9 for supplying hydraulic pressure to a hydraulic circuit, a motor 7 for driving the hydraulic pump 9, a pressure sensor 11 for detecting the pressure of the hydraulic circuit for connecting the hydraulic pump 9 and a load 10, and a detector 8 for detecting the rotation speed of the motor 7, and controls the hydraulic unit for driving the load 10 by using the hydraulic pressure supplied from the hydraulic pump 9, and is provided with a speed command arithmetic unit 15 for calculating a rotation speed command value Vc of the motor 7 based on a difference between a pressure command value Pc and a pressure detection value Pd, and a pressure holding determination part 17 for determining whether or not the load 10 is in a pressure holding state where it is not operated based on at least one of the difference between the pressure command value Pc and the pressure detection value Pd and the rotation speed detection value Vd of the motor 7 detected by the detector 8.SELECTED DRAWING: Figure 1

This invention discloses a constant flow pressure reducing valve, relating to the field of hydraulic valve technology. It includes a valve seat with an oil outlet, an oil inlet, and a drain port arranged sequentially from right to left. An elastic pressure regulating component is located at the left end of the valve seat, and a spool valve core is abutted at the right end of the elastic pressure regulating component. An axially movable elastic flow control valve core is located at the right end of the spool valve core. A drain channel communicating with the inner cavity of the valve seat is opened at the left end of the spool valve core, and the drain channel is connected to the drain port. The valve core slides within the valve seat, allowing oil to flow out from the drain port to relieve pressure. An oil inlet channel communicating with the oil inlet is located at the right end of the spool valve core, and a throttling channel communicating with both the oil inlet and outlet is provided on the elastic flow control valve core. The movement of the elastic flow control valve core within the valve seat maintains a constant pressure difference between the throttling channel and the oil inlet channel, thereby achieving a constant output flow rate. This constant flow pressure reducing valve achieves pressure reduction in the oil circuit and a constant output flow rate, facilitating processing and disassembly, and simplifying the hydraulic circuit.

Provided is a hydraulic circuit structure configured to be capable of preventing heat shock.　A hydraulic circuit structure (1) comprises: a hydraulic circuit for supplying hydraulic oil from a control valve (V1) to a hydraulic actuator (M); and warm-up oil passages (34a, 34b, 35, L4a, L4b). When the control valve is in a neutral position (PO) for bringing the hydraulic actuator into a neutral state, back-pressure oil, which is the hydraulic oil to which back pressure from the control valve is added and flowing into the hydraulic circuit, is discharged to a low-pressure region having a lower pressure than the back pressure via the warm-up oil passages.

The embodiment of the application provides a kind of digital hydraulic closed pump control system and its control method, it can be applied to hydraulic transmission and control technical field, the system includes: closed hydraulic circuit, with high-pressure side oil circuit and low-pressure side oil circuit;Digital hydraulic valve group includes cartridge valve between high-pressure side oil circuit and low-pressure side oil circuit, cartridge valve has control cavity, the pressure in control cavity is used to control the conduction state of cartridge valve, multiple high-speed switch valve is connected with the control cavity of cartridge valve, for controlling the pressure of control cavity;Controller is configured to: when the pressure gradient of high-pressure side oil circuit exceeds limit value, multiple high-speed switch valve is output first control signal to drive multiple high-speed switch valve to adjust the pressure in control cavity, to make high-pressure side oil circuit and low-pressure side oil circuit at least partially conductive;When the pressure gradient does not exceed limit value, multiple high-speed switch valve is output second control signal to drive multiple high-speed switch valve to make cartridge valve keep closed state.

Apparatus (10) for automatically filling a liquid (L) for a machine (100) comprising a removable tank (11) able to assume an inserted position (Pl) in a housing seating (111) of the machine (100) to receive the liquid (L), and an extracted position (P2) from the housing seating (111), and a filling device (12) connectable, upstream, to an inlet hydraulic circuit (13) of the liquid (L).