56results about How to "Displacement adjustable" patented technology

A portable automated pipette includes a linear actuator, a flywheel, an optical coupler and a control circuit. The linear actuator has a step motor and is connected to a control circuit. The step motor has a rotor and is connected to a flywheel. The flywheel includes a plurality of apertures formed on an internal surface of the flywheel. An optical coupler is arranged on two opposite sides of the flywheel and is connected to the control circuit. By means of the step motor, the portable automated pipette can monitor the displacement of the threaded rod to accurately control the picking / dispensing volume of liquid. Furthermore, the portable automated pipette can detect whether an aspirator is removed and can alert the user to check whether there is a wrong operation.

A portable automated pipette includes a linear actuator, a flywheel, an optical coupler and a control circuit. The linear actuator has a step motor and is connected to a control circuit. The step motor has a rotor and is connected to a flywheel. The flywheel includes a plurality of apertures formed on an internal surface of the flywheel. An optical coupler is arranged on two opposite sides of the flywheel and is connected to the control circuit. By means of the step motor, the portable automated pipette can monitor the displacement of the threaded rod to accurately control the picking / dispensing volume of liquid. Furthermore, the portable automated pipette can detect whether an aspirator is removed and can alert the user to check whether there is a wrong operation.

The invention discloses a multistage middle shaft rapid flushing gate which comprises a plurality of weir plates arranged on a vertical face. The middle part of each weir plate is correspondingly connected with one rotating shaft; the end parts of the rotating shafts are connected with the output end of a driving device; first sealing structures are arranged between the adjacent weir plates; the bottom of the bottommost weir plate is provided with a second sealing structure. The multistage middle shaft rapid flushing gate disclosed by the invention is arranged at an open water gap; the rotating shafts are driven to rotate by the driving device so as to drive the weir plates corresponding to the rotating shafts to rotate; when each weir plate is in a horizontal state, a pipe culvert has the maximum water discharge; when each weir plate rotates to a vertical state, the adjacent weir plates are abutted and are limited by a transverse baffle to form an integrated combined weir plate so as to form the flushing gate for stopping water flow, i.e. the multistage middle shaft rapid flushing gate has an intercepting effect.

A warm-up pilot pressure control unit adjusts pilot pressure inputted to a first flow channel open / close unit so that the flow channel open / close unit is switched to an open state when a warm-up start state is entered under the necessary condition that a first winch operation member is in a neutral position. When the first flow channel open / close unit is in the open state, a first pump displacement adjustment unit adjusts the displacement of a first hydraulic pump so that the differential pressure between a first pump hydraulic circuit and a first warm-up hydraulic circuit becomes constant at a predetermined set pressure.

The invention belongs to the technical field of epoxy resin films, and particularly relates to an epoxy resin, film which is prepared from the following raw materials in parts by weight: 40-60 parts of E44 epoxy resin, 30-50 parts of hydrogenated butadiene-acrylonitrile rubber, 3-5 parts of inorganic mixed filler, 6-10 parts of phospholipid molecule solution, 2.5-5 parts of curing agent and 6.5-7-10 parts of polyvinyl chloride paste resin. The preparation method includes following steps: adding a mixture of E44 epoxy resin, hydrogenated butadiene-acrylonitrile rubber, a curing agent and polyvinyl chloride paste resin into an acetone solution to obtain a blended solution; and adding a phospholipid molecule solution and an inorganic mixed filler into the blended solution to obtain a uniformly dispersed solution. A roller rotates back and forth to drive the two ends of the flattening tank body to move upwards and sink intermittently through the pull ropes, and then an epoxy resin solutioncan be uniformly and efficiently spread in the flattening tank body to reach a self-leveling state; a vibration exciter is arranged at the bottom of the flattening tank body, wherein the vibration exciter enables the bottom of the flattening tank body to be in a vibration state, so that the epoxy resin solution is more uniformly spread.

The invention discloses an intelligent manhole cover with adjustable drainage volume, comprising a manhole cover body and a supporting bottom plate. The supporting bottom plate is connected with the manhole cover body through screws; a plurality of water inlets which are annularly distributed are formed on the manhole cover body, and an annular filtering plate which is used for filtering impurities is embedded in the manhole cover body; a circular plate is placed at the middle position of the annular filtering plate; the lower surface of the circular plate is connected with a plurality of folding rods; the bottom of the folding rods are fixedly connected with the baffle plates; the baffle plates are tightly attached to the inner wall of the manhole cover body, and a drainage outlet is formed at each baffle plate tightly attached to the inner wall of the manhole cover body; the upper surface of the circular plate is connected with a motor through a transmission shaft; the motor is embedded in the controlling box at the top of the manhole cover body; a PCB board is arranged in the controlling box and a controller electrically connected with the motor is integrated on the PCB board; the controller is electrically connected with a power supply module, a rainfall sensor, a GPS positioning module and a wireless communication module respectively; the wireless communication module is connected with a monitoring terminal through signals, and the rainfall sensor is embedded on the top of the manhole cover body.

The invention relates to a hydraulic drive system (10) having a first and a second hydraulic pump (20, 30), wherein the first and the second hydraulic pump (20, 30) can promote hydraulic fluid to each of at least one associated first (24) and at least one associated second supply consumers (39) with hydraulic fluid, wherein said second hydraulic pump (30) having a fluid input (31) and a fluid output (32), wherein the fluid inlet (31) with a tank (11) is connected, so that the second hydraulic pump (30) of hydraulic fluid from the tank (11) suck in can,. According to the invention, the fluid inlet (31) of the second hydraulic pump (30) via a return line (12) is connected to at least one first consumer (24), that of the at least one first load (24) back-flowing hydraulic fluid at a pressure above ambient pressure in the second hydraulic pump flow (30).

The invention discloses an aircraft test anti-freezing and anti-thawing terrace and an anti-freezing and anti-thawing parameter optimization method. The aircraft test anti-freezing and anti-thawing terrace comprises a composite terrace body and an anti-freezing and anti-thawing device located below the composite terrace body, a main ground groove is formed in the middle of the anti-freezing and anti-thawing device, and a plurality of branch ground grooves are symmetrically formed in the two sides of the main ground groove; a plurality of anti-freezing and anti-thawing pipes are arranged between every two groups of branch ground grooves located on the same side, the front ends of one group of anti-freezing and anti-thawing pipes in all the corresponding anti-freezing and anti-thawing pipes in the branch ground grooves are water inlet pipe sections vertically and upwards penetrating through the composite terrace body, and the tail ends of each group of anti-freezing and anti-thawing pipes are water drainage pipe sections vertically and downwards. The water inlet pipe section is correspondingly connected with a drainage assembly embedded in the surface of the composite terrace body, and two mooring assemblies are symmetrically arranged in the middle of the composite terrace body. The anti-freezing and anti-thawing terrace can effectively prevent bottom layer soil from being frozen and thawed, avoids terrace structure damage, is excellent in bearing capacity, can meet the wheel pressure load of a large passenger plane, is high in structural strength and provides large fixing force for mooring.

The invention relates to a corrugated pipe metering pump which comprises a bracket, an electromagnetic valve, a direct-current speed reducing motor, a cam and a corrugated pipe, wherein the upper part of the corrugated pipe is communicated with a liquid inlet and outlet pipeline of the electromagnetic valve through a corrugated pipe joint; a return spring is sleeved outside the corrugated pipe; the lower part of the closed corrugated pipe is connected with a transmission rod; the transmission rod passes through a nut; a bearing is installed at the bottom end of the transmission rod; the bearing is always in contact with the rim of the cam; the rotary cam drives the corrugated pipe through the transmission rod to extend and shrink to enable the corrugated pipe to suck and discharge liquid; the nut is matched with a corrugated pipe nut seat for supporting the corrugated pipe; and the deformation stroke of the corrugated pipe is adjusted by adjusting the screw-in depth of the nut in the corrugated pipe nut seat, thereby changing the liquid sucking amount and the liquid discharging amount of the corrugated pipe. The invention has the advantages of reasonable structure, simple and reliable power transmission, adjustable corrugated pipe displacement, no radial deformation, high repeated liquid feeding accuracy and adjustable pump displacement, and is suitable for occasions with the requirement of variable pump displacements.

The invention discloses a wave making machine of a building facility in an amusement park. The wave making machine of the building facility in the amusement park comprises a machine frame, a wave plate arranged on the machine frame, a pushing plate arranged below the wave plate, and an ejecting mechanism used for driving the pushing plate. The ejecting mechanism comprises an ejecting wheel and a restoring wheel. The ejecting wheel and the restoring wheel are vertically and coaxially arranged and have the same outer diameter. An ejecting block is arranged on the outer circle of the ejecting wheel. A lug is arranged on the outer circle of the restoring wheel. A cam shaft is transversely arranged on the lug. Four arc-shaped grooves are evenly distributed in the ejecting wheel in the circumferential direction. Screws are arranged in the arc-shaped grooves and used for locking the ejecting wheel and the restoring wheel together. A roller is arranged above the ejecting wheel. A connecting shaft is arranged in the center of the roller in a penetrating mode. The roller is as wide as the ejecting wheel. A shifting lever is further arranged on the connecting shaft. The shifting lever is located on the outer side of the restoring wheel and periodically shifted by the cam shaft. According to the wave making machine of the building facility in the amusement park, the water discharge amount of the wave plate can be adjusted through the change of the jacking time of an ejecting shaft, and accordingly the form and interval period of waves are adjusted.

The invention discloses a reciprocating compressor and a refrigerator with the same. The reciprocating compressor comprises a crankshaft, an air cylinder, a piston and an eccentric sleeve. The crankshaft comprises a main shaft and an eccentric shaft which are connected with each other and are eccentrically arranged, the piston is connected with the eccentric shaft through a connecting rod, the piston is arranged in the air cylinder and can move in the axial direction of the air cylinder, and an eccentric shaft sleeve is arranged on the eccentric shaft and located in a rod hole of the connecting rod; the eccentric shaft sleeve is located at the first position when the crankshaft rotates in the first direction, and is located at the second position when the crankshaft rotates in the second direction opposite to the first direction; when the eccentric shaft sleeve is located at the first position, the outer diameter center of the eccentric shaft sleeve is located on the side, far away from the main shaft, of the inner diameter center of the eccentric shaft sleeve; and when the eccentric shaft sleeve is located at the second position, the outer diameter center of the eccentric shaft sleeve is located on the side, close to the main shaft, of the inner diameter center of the eccentric shaft sleeve. The reciprocating compressor has different displacements when rotating in different directions, the displacement of the reciprocating compressor is adjustable, and the power dissipation is smaller.

The invention relates to a multi-cascaded double-cylinder linear compressor, and belongs to the field of energy power. The multi-cascaded double-cylinder linear compressor comprises double-cavity compression cylinders, a linear motor and cascading pipes. Each cylinder is composed of a cylinder cover and a cylinder body and is divided by a double-sided piston into two air cavities (a first-stage compression cavity and a second-stage compression cavity), wherein the two air cavities communicate with each other through the corresponding cascading pipe; and the double-sided piston is driven by thelinear motor to reciprocate to continuously change the volumes of the two air cavities, so that first-stage compression and second-stage compression are completed. Series connection and parallel connection of the multi-cascaded double-cylinder linear compressor are completed through different connection manners of the cascading pipes, and thus, variable-pressure ratio and variable-displacement output is achieved. According to the multi-cascaded double-cylinder linear compressor, the structure of the high-pressure compressor is simplified; and a multi-cascaded reciprocating-type linear compressor system is a resonant system, so that the energy utilization rate is increased.

The invention discloses a top shaft multistage rapid flushing gate which comprises pipe culvert foundations. Rotating shafts are connected between the opposite pipe culvert foundations at both sides; the rotating shafts are connected with weir plates; at least two weir plates are provided in the vertical direction; the top of each weir plate is provided with one rotating shaft; weir plate sealing cushions capable of being compressed and sealed with the corresponding rotating shafts are arranged between the corresponding rotating shafts and the weir plates above the rotating shafts; the weir plate sealing cushions are fixed at the bottoms of the weir plates; a first limiting check block is fixedly arranged on the pipe culvert foundation at the bottom; a first limiting sealing cushion capable of being compressed and sealed with the bottommost weir plate is fixedly arranged on the first limiting check block. By a plurality of rotating weir plates, a pressure borne by one single weir plate is reduced, and the size and the intensity requirement of each single weir plate are reduced; each single weir plate bears a small pressure and has a high opening speed; when the plurality of rotating weir plates simultaneously rotate to be opened, a good flushing effect can be formed; by selecting a suitable number of the weir plates to be opened, the aim of regulating the water discharge is fulfilled; the top shaft multistage rapid flushing gate has a simple structure, can be designed to have different sizes according to different environments and is convenient to install and manufacture.

The invention provides a commercial vehicle full-variable displacement oil pump which comprises a pump body, a pump cover, a variable sliding block, a driving shaft, a rotor and blades, a proportional electromagnetic valve and a safety valve are installed on the pump body, and a large through hole and a rotor cavity are formed in the pump body; a crankshaft gear is installed in the large through hole, the crankshaft gear is composed of a middle cylinder part and an annular gear tooth part, an inner hole of the cylinder part is used for being connected with an engine crankshaft, an annular groove is formed in the periphery of the cylinder part, and a steel cable baffle ring with a notch is installed in the annular groove; the large through hole is divided into a small hole section and a large hole section, and an annular step surface is formed between the small hole section and the large hole section; the variable sliding block, the driving shaft, the rotor and the blades are all installed in the rotor cavity, the pump cover is used for covering the rotor cavity, one end of the driving shaft penetrates out of a shaft hole of the pump cover and then is provided with a driving gear, and the driving gear is meshed with the crankshaft gear. Therefore, the transmission ratio can be increased to more than 2, the rotating speed range of the oil pump is expanded, and matching control of the electromagnetic valve is facilitated.

The invention relates to a composite pile foundation of open caisson pile adding. The composite pile foundation comprises a single open caisson foundation, steel rod parts with threads, a side wall steel plate with a ring pull and counterweight pressing blocks, the centre of the lower part of the single open caisson foundation is provided with a plurality of steel rod parts with the threads, the upper ends of the steel rod parts with the threads areprovided with the counterweight pressing blocks, the counterweight pressing blocks are fixedly arranged at the bottom of the singleopen caisson foundation, and the outer side wall of thesingleopen caisson foundation is provided with the side wall steel plate with the ring pull. According to the composite pile foundation of the open caisson pileadding, the composite pile foundation is a novel open caisson pile adding composite foundation form with the adjustable length of a pile body, an adjustable stress position of a caisson body and the adjustable self-weight of the caisson body, and further a open caisson pile adding composite foundation form with an adjustableposition of a stress action point of the open caisson foundation, and thevariable length of the pile body and self-weight of the open caisson foundation in an experiment,indoor experiment operation of open caisson stress mechanism research is more convenient and fast, working efficiency is improved, and experimenting is more accurate.

The invention relates to an automatic polishing machine based on annular assembled plates. The automatic polishing machine comprises a frame, a rotary driving device, an annular board placing tank, alinear moving mechanism, a lifting mechanism and a polishing machine; a machining tabletop is horizontally arranged at the upper end of the frame; the rotary driving device is mounted on the machiningtabletop; the board placing tank is horizontally mounted at a driving end of the rotary driving device; the rotary driving device can drive the board placing tank to horizontally rotate; the linear moving mechanism is horizontally erected above the board placing tank; the lifting mechanism is mounted on the linear moving mechanism, and a driving end is downwards and provided with the polishing machine; the linear moving mechanism can drive the lifting mechanism to drive the polishing machine to horizontally move; and the lifting mechanism can drive the polishing machine to move up and down toapproach or leave from the board placing tank. The automatic polishing machine has the advantages of simple structure, convenience to operate, no need of manual adjustment of the whole equipment, time and labor saving, high machining efficiency and high quality.

A reception unit (301) receives a plurality of pieces of I-frame data and a plurality of pieces of P-frame data in which time stamps are set. A time acquisition unit (302) acquires a reception time of each I-frame data. A video storage unit (303) stores the plurality of pieces of I-frame data and the plurality of pieces of P-frame data. A time calculation unit (304) calculates a readout time of the I-frame data from the video storage unit (303) based on a reception time of the I-frame data to be read out, a reception time of preceding I-frame data being I-frame data that precedes the I-frame data to be read out, and a readout time of the preceding I-frame data, and calculates a readout time of the P-frame data from the video storage unit (303) based on a time stamp of the P-frame data to be read out. A data readout unit (305) reads out the I-frame data to be read out and the P-frame data to be read out at the times calculated by the time calculation unit (304).

The invention provides a rotor engine and a regulation and control method for operating parameters thereof. The rotor engine comprises a housing and a rotor. The rotor is located in the housing, and the housing is formed by assembling multiple parts and comprises an upper end cover, an outer partial cover, a stator, an inner partial cover and a lower end cover that are connected in sequence. The stator is internally provided with a trivalvular cavity encircled by three arc-shaped side walls, the rotor which is "8"-shaped is located in the trivalvular cavity in the stator, and an arc of a headof "8" is matched with a circular arc of the trivalvular cavity; The trivalvular cavity is provided with an arc-shaped inner wall, and three symmetrically distributed combustion chambers are arrangedon the arc-shaped inner wall of the trivalvular cavity. Based on intensive study on the rotor engine, the separation distance between the arc-shaped side wall of the rotor and the arc-shaped inner wall of the trivalvular cavity is further adjusted, so that an engine pressure ratio is further improved.

The invention provides a plunger pump. The plunger pump comprises a valve body, a drive transfer portion and a displacement regulating portion. The valve body consists of a main valve body, a left valve body and a right valve body, the valve body is provided with a fluid flow passage communicated with an oil inlet and an oil outlet, flow-limiting valves for controlling the oil inlet and the oil outlet to open and close are arranged in the fluid flow passage, the main valve body is provided with a hermetic hydraulic cavity communicated with the fluid flow passage, and a plunger is arranged in the hydraulic cavity. The drive transfer portion comprises a connecting rod and a regulating seat, the upper end of the connecting rod is hinged to the bottom end of the plunger, and the lower end of the connecting rod is hinged to the regulating seat. The displacement regulating portion is arranged in the regulating seat and comprises a regulating block, a hinge joint shaft and a regulating drive part, wherein the regulating block is embedded into the regulating seat, the hinge joint shaft is fixedly connected to the regulating block, and the regulating drive part is used for regulating the position of the hinge joint shaft. The plunger pump is capable of providing precise displacement according to different displacement needs.

The invention provides a crude oil storage tank automatic drainage oil retention system which comprises a crude oil storage tank, a drainage pipeline and an oil-water online control device. An upper oil-water layering detector is arranged at the upper portion inside the crude oil storage tank. A lower oil-water layering detector is arranged at the lower portion inside the crude oil storage tank. An inlet of the drainage pipeline is led into the bottom of the crude oil storage tank. An outlet of the drainage pipeline is led into a sewage pond, and an electromagnetic valve is arranged on the drainage pipeline. The oil-water online monitoring device is in signal connection with a remote control terminal through a communication circuit. The signal input end of the oil-water online monitoring device is electrically connected with the upper oil-water layering detector and the lower oil-water layering detector separately. The signal output end of the oil-water online monitoring device is electrically connected with the electromagnetic valve. The invention further provides a crude oil storage tank automatic drainage oil retention method implemented by adopting the crude oil storage tank automatic drainage oil retention system.

The invention discloses a watering machine for flowers and plants. The machine comprises a base, a machine body is arranged on the base, and a water tank is arranged in the machine body; a water addition channel communicated with the water tank is arranged at the right end of the machine body, a water groove is formed in the portion, in the machine body, of the left side of the water tank, extendsupwards and is communicated with the exterior of the machine body, and a water inlet pipe is connected between the bottom of the water groove and the water tank; a water pump is arranged in the watergroove, a fourth water pipe connector is fixedly connected to the top of the water groove, and a first sliding block groove is formed in the portion, in the machine body, of the left side of the water groove. The watering machine is simple in structure and low in manufacturing cost and maintenance cost, a water sprayer can be automatically controlled to conduct water spraying operation, front-rear and left-right displacement of the water sprayer can be adjusted, the flowers and plants can be comprehensively subjected to spray irrigation, the spray irrigation efficiency of the flowers and plants is improved, the labor intensity of workers is reduced, and the watering machine is easy and convenient to operate.

The invention discloses a reciprocating compressor and a refrigerator with the same. The reciprocating compressor comprises a crankshaft, an air cylinder, a piston and an eccentric sleeve. The crankshaft comprises a main shaft and an eccentric shaft which are connected with each other and are eccentrically arranged, the piston is connected with the eccentric shaft through a connecting rod, the piston is arranged in the air cylinder and can move in the axial direction of the air cylinder, and an eccentric shaft sleeve is arranged on the eccentric shaft and located in a rod hole of the connecting rod; the eccentric shaft sleeve is located at the first position when the crankshaft rotates in the first direction, and is located at the second position when the crankshaft rotates in the second direction opposite to the first direction; when the eccentric shaft sleeve is located at the first position, the outer diameter center of the eccentric shaft sleeve is located on the side, far away from the main shaft, of the inner diameter center of the eccentric shaft sleeve; and when the eccentric shaft sleeve is located at the second position, the outer diameter center of the eccentric shaft sleeve is located on the side, close to the main shaft, of the inner diameter center of the eccentric shaft sleeve. The reciprocating compressor has different displacements when rotating in different directions, the displacement of the reciprocating compressor is adjustable, and the power dissipation is smaller.

The invention discloses a water injection pump hydraulic system comprising a pump cylinder, a coupler connected with the pump cylinder, and a hydraulic cylinder connected with the coupler. The hydraulic cylinder is connected with a constant power variable pump, the constant power variable pump is connected with a metering pump and an oil filter. The water injection pump hydraulic system has the advantages that the water injection pump hydraulic system is high in pressure, big in flow, simple in structure, is efficient and energy saving, long in service life, adjustable in discharge capacity, easy to maintain and operate, simple in structure, accurate and reliable in reversion and capable of increasing pressure.

The invention provides a hoisting device for adjustable electric vehicle charging and battery box replacing. The hoisting device comprises a battery grabbing mechanism, a lifting appliance, a controlpart and a communication part, wherein the lifting appliance is used for lifting the battery grabbing mechanism and a battery box; the control part is connected with the battery grabbing mechanism andthe lifting appliance and is used for controlling the grabbing / releasing motion of the battery grabbing mechanism and the lifting / downward putting motion of the lifting appliance; and the communication part is used for the communication connection between the control part and the battery grabbing mechanism. The battery grabbing mechanism is provided with an adjustable assembly. The adjustable assembly is used for adjusting the displacement of the battery box when the battery box is lifted by the lifting appliance, so that the battery box can accurately reach required positions in the hoisting process. The hoisting device can be used for realizing hoisting when the top of the battery box is replaced. The battery box is held from two sides, and top hoisting is adopted, so that the batterybox can be conveniently and rapidly replaced, and the hoisting device has an automatic realization prospect.

The invention discloses a hydraulic process based on a water-injection pump hydraulic system. The process includes: a, a hydraulic reversing valve is on the left, a piston of a left hydraulic cylinder is at a certain position of the middle upper end, and a rod-end plunger of a right hydraulic cylinder is at a certain position of the middle; b, the piston continues moving down, and oil in a cavity is discharged through an internal hydraulically-controlled one-way valve; c, the one-way valve enters right-end space of a spool of the reversing valve and pushes the spool to move leftwards; d, main pump oil continuously pushes the piston to move down, meanwhile, the main pump oil enters upper cavities of the hydraulic cylinders and starts to push the piston to move down; e, the hydraulic cylinders start to discharge liquid at uniform speed and arrives the bottommost end; f, the oil pushes the piston of the left hydraulic cylinder to move down, then pushes the piston to move up, and pushes the oil in the upper cavities to flow back into an oil tank. The hydraulic process has the advantages of high pressure, high flow, simple structure, high efficiency, energy saving, long service life, displacement adjustability, ease of maintenance and operation, reversing accuracy and reliability, and capability of boosting.

The invention relates to a lead extrusion and friction composite damping device and a using method thereof. The lead extrusion and friction composite damping device comprises a rectangular box, wherein a moving plate with two ends respectively penetrating through a box body is horizontally arranged in the box body, a connecting hole connected with an external supporting member is arranged at the end, penetrating through the box body, of the moving plate, a longitudinal conical protrusion is arranged on the front side face, located in the box body, of the moving plate, at least two longitudinal arc-shaped protrusions are arranged on the rear side face, located in the rectangular box body, of the moving plate, a friction plate and a friction plate adjusting mechanism are arranged on the front side, located at the longitudinal conical protrusion, in the box body, a lead body is filled in the cavity where the longitudinal arc-shaped protrusions are located in the box body, and longitudinal bolts connected with a structural body are further arranged on the base plate of the box body. The lead extrusion and friction composite damping device is simple in structure, achieves better vibration reduction effect under the condition of different vibration, and the using method is simple.

A warm-up pilot pressure control unit adjusts pilot pressure inputted to a first flow channel open / close unit so that the flow channel open / close unit is switched to an open state when a warm-up start state is entered under the necessary condition that a first winch operation member is in a neutral position. When the first flow channel open / close unit is in the open state, a first pump displacement adjustment unit adjusts the displacement of a first hydraulic pump so that the differential pressure between a first pump hydraulic circuit and a first warm-up hydraulic circuit becomes constant at a predetermined set pressure.