197 results about "Gear oil" patented technology

The utility model discloses an automatic gear oiling machine, and belongs to the technical field of gear machining equipment. The gear oiling device structurally comprises a feeding frame, a discharging frame and a gear oiling set, an automatic gear oiling technology is adopted, a gear to be machined is placed in the gear oiling set, automatic limiting-oiling operation is carried out on the gear, labor loss of workers is effectively reduced, the gear oiling work efficiency is improved, and the gear oiling device is suitable for large-scale production. And meanwhile, the oil dripping quantity of the gear can be more uniform, and the situation that the oil dripping quantity of the gear is not uniform is avoided.

The utility model relates to the field of gear oil pump manufacturing, in particular to punching equipment for gear oil pump manufacturing, which comprises a workbench, two clamping assemblies are symmetrically arranged on the workbench, a sliding plate is arranged between the two clamping assemblies, first horizontal gears are arranged at two ends of the sliding plate, a transmission assembly is arranged between the two first horizontal gears, and a second horizontal gear is arranged between the two first horizontal gears. The sliding plate, the transmission rod, the first horizontal gear, the rack, the second horizontal gear and other components are arranged, and the transmission rod component, the first bevel gear component and the second bevel gear component are matched with one another in the working process; the two first horizontal gears on the sliding plate rotate in the same direction, the two racks move relatively through mutual cooperation between the rack component and the second horizontal gear component, the two clamping assemblies can synchronously clamp different positions of a part by controlling the sliding plate to move, and the stability in the working process is improved.

The application provides a floor grinding machine gear box guide plate structure parameter optimization design method, which is used for determining the optimal values of three radial clearances between the guide plate and the gear tooth top. Firstly, a parameterized gear box model containing clearance as a variable is constructed, and a gear oil stirring loss theoretical model is established based on the boundary layer theory and the fluid resistance theory; taking the maximum lubrication efficiency as the target and the oil stirring power loss not exceeding the set threshold as the constraint condition, a central composite design method is used to select representative sample points in the design space; through computational fluid dynamics simulation, a moving particle semi-implicit method is used for splash lubrication transient analysis to obtain performance data of each point; based on the simulation data, a high-precision proxy model is constructed; finally, under the condition of meeting the oil stirring power loss constraint condition, the maximum lubrication efficiency is taken as the target for optimization solving to obtain the optimal clearance combination. The method realizes the quantitative design from parameters to performance, and effectively replaces the traditional trial and error method.

The utility model discloses a sealing structure of a steering gear oil cylinder, which belongs to the technical field of sealing of steering gear oil cylinders and comprises a shaft steel wire baffle ring, an oil cylinder oil seal iron sleeve, a sealing rubber ring, a supporting sleeve, a high-pressure framework oil seal, a rack assembly and a steering gear assembly. The device is novel in design and ingenious, the annular groove is formed in the inner wall of the steering engine in advance, then a spring steel structure is adopted to be connected with the annular groove in a clamped mode, and therefore the aluminum blocking structure at the end of the steering engine oil cylinder shell is effectively locked, meanwhile, the high-pressure oil seal is additionally arranged on the other side of the blocking structure, and the sealing effect is good. The outer wall of the blocking structure is sleeved with the two sets of sealing rubber rings to enhance the sealing effect on oil, the two sets of sealing rubber rings and the high-pressure oil seal can achieve the purposes of shock absorption and noise reduction, the oil sealing performance of the steering engine oil cylinder shell is improved, the machining difficulty of the steering engine shell is reduced, the production and installation efficiency is improved, and the service life of the steering engine oil cylinder shell is prolonged. Therefore, the purpose of prolonging the service life of the steering engine can be achieved.

The application provides an extreme pressure anti-wear agent, a preparation method thereof and heavy load vehicle gear oil, and belongs to the technical field of extreme pressure anti-wear additives. The application provides an extreme pressure anti-wear agent with a chemical structure shown in formula I or formula II. Through molecular design, the prepared extreme pressure anti-wear agent has excellent high-temperature oxidation resistance, can reduce the friction coefficient of the surface of a friction pair, and in the friction process, nitrogen elements and boron elements in the borate ester diffuse from the friction surface to the matrix to form a permeation layer, improve the wear resistance of the surface of the material, play an extreme pressure anti-wear role, make the heavy load vehicle gear oil have better load-carrying capacity and extreme pressure resistance, and thus play an energy-saving and consumption-reducing role.

The utility model discloses a gear oil pump which comprises a driving gear. A driven shaft coaxially penetrates through the driving gear, the lower end of the driven shaft is fixedly connected with the driving gear, the upper end of the driven shaft is connected with the driving shaft through an overload protection structure, and the overload protection structure comprises a variable-diameter protruding part coaxially fixed to the driven shaft and a variable-diameter containing part coaxially arranged outside the variable-diameter protruding part in a sleeving mode; a driving shaft is coaxially fixed at the upper end of the variable-diameter accommodating part and is connected with a driving device; when the friction force between the variable-diameter containing part and the variable-diameter protruding part is large enough to drive the driven shaft to rotate, the variable-diameter containing part is fixedly connected with the variable-diameter protruding part, and when the friction force between the variable-diameter containing part and the variable-diameter protruding part is not large enough to drive the driven shaft to rotate, the variable-diameter containing part is rotationally connected with the variable-diameter protruding part; when the driving gear cannot rotate relatively or is difficult to rotate, the driving gear is rotationally connected with the driving device, so that the driving device rotates without load.

The utility model discloses a self-lubricating sealing support mechanism, which comprises a transmission sealing sleeve, a support sleeve, a sealing cover, a bearing, a first sealing ring and a second sealing ring, the support sleeve and the sealing cover are respectively sleeved outside a transmission shaft and are detachably connected together, the transmission sealing sleeve is sleeved between the transmission shaft and the support sleeve, and the bearing is arranged on the support sleeve. The transmission sealing sleeve, the supporting sleeve and the sealing cover jointly limit the bearing arranged outside the transmission shaft in a sleeving mode, the bearing is communicated to an oil cavity of the gear oil tank, the first sealing ring is sealed between the transmission shaft and the transmission sealing sleeve, the second sealing ring is sealed between the transmission sealing sleeve and the supporting sleeve, the bearing does not need to be lubricated manually at regular intervals, and the working efficiency is improved. And self-lubrication of the bearing can be realized.

The utility model discloses a wear -resisting alloy gear oil pump relates to gear pump technical field, including oil pump subassembly, and oil pump subassembly includes pump body, end cover, input rod, driving gear and driven gear, and driving gear and driven gear are rotationally installed in the pump body, the utility model discloses a spiral wear -resisting groove is arranged on the tooth top circle surface of gear, and the wear -resisting groove is filled with molybdenum disulfide grease, can form good lubricating effect on the contact surface of gear and other components, reduce friction and abrasion, reduce the metal scrap of abrasion simultaneously, avoid the damage of scrap to other components, in addition, wear -resisting bushing is arranged in the position corresponding to the gear outer circle of the inner wall of pump body, and wear -resisting bushing is made of high -hardness ceramic material, and the surface of side plate and gear end face contact is plated with a layer of hard alloy coating, further improved the wear resistance between each component of gear oil pump, prolonged the service life of whole gear oil pump.

The invention relates to the technical field of equipment control, in particular to a filtering device for filtering oil sludge in gear oil and a control method. A data acquisition module acquires and preprocesses pressure, flow and temperature data to generate a multi-dimensional data flow; the digital twin module drives a hybrid virtual model based on the data stream and outputs a system state estimation value; the parameter optimization module executes multi-objective optimization calculation to generate pressure and flow set values, and iteratively corrects the pressure and flow set values through virtual verification; the learning adaptation module constructs a knowledge base and adapts a new working condition by using a meta-learning algorithm; and the execution control module converts the optimized set value into a control instruction and feeds back an execution deviation. And each module forms a multi-level feedback closed loop and an updating path through a data quality evaluation result, optimization set value virtual verification, execution deviation and an adaptation rule, so that accurate cooperative control of filtering pressure and flow is realized, and the oil sludge removal thoroughness and the filtering efficiency are effectively improved.

This application relates to the field of gear oil pump technology and discloses a gear oil pump device, including a gear oil pump, a water-cooled base fixedly installed at the bottom of the gear oil pump, a liquid storage chamber opened in the water-cooled base, a base fixedly installed at the bottom of the water-cooled base, a liquid storage tank fixedly installed on the right side of the base and the right side of the water-cooled base, a heat dissipation box fixedly installed on the top of the liquid storage tank, and a first mounting plate fixedly installed on the inner wall of the top and bottom of the heat dissipation box. This application has the following advantages and effects: by providing a first heat dissipation mechanism, the gear oil pump can be cooled by air; by providing a second heat dissipation mechanism, air can be blown into the liquid storage tank through ventilation holes, accelerating the airflow on the surface of the coolant. The heat dissipation holes form a thermal convection channel, efficiently removing the heat absorbed by the coolant, thereby accelerating the cooling of the coolant and improving the water cooling effect.

The invention relates to lubricating oil for an electric drive axle of a commercial vehicle and a preparation method thereof, and belongs to the technical field of lubricating oil. The lubricating oil for the electric drive bridge comprises the following components in parts by weight: 85-95 parts of base oil, 2-10 parts of a composite additive, 2-8 parts of a viscosity index improver and 0.1-0.5 part of an electric drive oil reinforcing agent, the base oil is a combination of coal-to-liquid and poly-alpha-olefin; the total amount of the components is 100 parts. The invention also provides a preparation method of the lubricating oil for driving the axle. By optimizing a lubricating formula, the problems of high rotating speed, high load, large torque and multi-working-condition operation of an electric drive axle are solved in a targeted manner, and compared with traditional GL-5 gear oil, transmission efficiency can be remarkably improved, the service life of parts can be prolonged, electrical safety can be guaranteed, and the lubricating oil is a key guarantee for reliable operation of an electric drive axle system.

1. Name of the product in this design: Gear oil filling and recycling trolley. 2. Purpose of this design: for gear oil filling and recycling. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: a 3D model.

The invention provides a transverse shaft type cutting mechanism and a transverse shaft type heading machine, and belongs to the field of tunnel construction equipment. The transverse shaft type cutting mechanism comprises a speed reducer, a cutting head and a spraying flow distribution mechanism, a flow distribution channel is arranged in the spraying flow distribution mechanism, an overflow cavity is arranged in the transverse shaft type cutting mechanism, and a sealing sleeve is installed between the cutting head and an end cover of the speed reducer in a sealing mode. A dynamic sealing structure is arranged between the speed reducer end cover and the outer peripheral surface of a water inlet seat fixed on a rotating shaft of the speed reducer in the spray flow distribution mechanism; and an overflow water channel which is communicated with an overflow cavity and is used for leading leaked water to the outer surface of the transverse shaft type cutting mechanism is arranged in the transverse shaft type cutting mechanism. The horizontal shaft type heading machine comprises the horizontal shaft type cutting mechanism. On the basis of an existing cutting mechanism capable of spraying directionally, internal leaked water can be discharged to the outer surface in time by improving the structure, gear oil and bearing lubricating oil are prevented from being polluted by leaked water, and field personnel can obtain water leakage information as soon as possible.

This invention relates to the field of speed reducer technology and provides a novel lubrication system for a cutting speed reducer. The system includes a cutting speed reducer, internal lubrication channels, and external piping. The internal lubrication channels include a forced lubrication channel, comprising a central oil sump, a filter, an oil pump inlet pipe, a gear oil pump, an oil pump outlet pipe, oil supply holes for the machine body, oil supply holes for the frame, oil return holes for the frame, oil return holes for the machine body, and a lubricating oil output point. This invention solves the problems of insufficient lubrication and cooling of gears and bearings caused by gear oil pump damage and unreasonable internal piping design, effectively improving the reliability of key components such as gears and bearings in the speed reducer, thereby ensuring that the cutting speed reducer can operate efficiently for extended periods.

The invention discloses an extreme pressure anti-wear gear oil composite additive and a processing method thereof, and relates to the technical field of gear oil composite additives, and the extreme pressure anti-wear gear oil composite additive comprises the following components: 15-25% of sulfurized isobutylene, 10-20% of zinc dialkyl dithiophosphate, 8-15% of polyisobutylene succinimide, 5-12% of mahogany petroleum sulfonate, 5-12% of 2, 3, 5-trimethyl-1, 3-pentanediol monoisobutyrate, 5-12% of 2, 3, 5-trimethyl-1, 3- According to the invention, through scientific compounding of core functional components, synergistic interaction of extreme pressure and anti-wear performance is realized, the defect that performance of a single additive is poor is effectively overcome, the anti-wear performance of the lubricating oil is greatly improved, the service life of the lubricating oil is prolonged, and the service life of the lubricating oil is prolonged. The product can be precisely adapted to different application scenes such as heavy-load engineering machinery, high-speed precise gear transmission systems and mining machinery, can form a stable lubricating protective film under harsh working conditions, resists the failure problems such as abrasion, scratch and sintering of a gear contact surface, is high in adaptability, does not need to additionally adjust a formula according to the working conditions, and is low in cost. The lubricating protection requirements of various gear transmission devices can be met, and the application range is wide.

The invention relates to the field of lubricating oil, in particular to a nonferrous metal-friendly gear oil composition as well as a preparation method and application thereof. The gear oil composition comprises the following components in parts by weight: 100 parts of wind power gear oil and 0.5-2 parts of ammonium phosphate, wherein the wind power gear oil contains alkyl polysulfide with medium and low activity, and the content of trivalent sulfur of the alkyl polysulfide is 50-100%. The wind power gear oil composition provided by the invention is excellent in performance, the compatibility of an oil product and a sliding bearing, especially a copper part, can be improved to a greater extent, and the metal corrosion with a fan gear box is reduced; the wind power gear oil composition provided by the invention has the advantages of simple components, easily available raw materials, simple preparation method and wide large-scale application prospect, and can meet the requirements of customers on extreme pressure wear resistance of wind power gear oil.

This utility model relates to a single-side plate gear oil pump with a shared oil outlet, belonging to the field of gear oil pump technology. It includes a front pump body and a rear pump body, with an intermediate body fixedly disposed between them. A front pump drive gear and a front pump driven gear are rotatably disposed inside the front pump body, and a rear pump drive gear and a rear pump driven gear are rotatably disposed inside the rear pump body. A side plate is disposed inside both the front and rear pump bodies. The side plate inside the front pump body is located on the side of the front pump drive gear and the front pump driven gear away from the intermediate body, and the side plate inside the rear pump body is located on the side of the rear pump drive gear and the rear pump driven gear away from the intermediate body. An oil inlet is disposed on one side of the front pump body, and an oil inlet and an oil outlet are disposed on each side of the rear pump body. This design solves the problems of numerous parts and pipelines in traditional gear pumps.

The utility model relates to lubricating oil fine filter equipment technical field especially based on lubricating oil pollution degree's gear box on -line fine filter equipment, including filter jar, the top of filter jar is provided with the jar cover, the top edge department of jar cover is provided with the pressure gauge, the top middle department of jar cover is provided with the manual pressure discharge mouth, the inside installation of filter jar has the filter core, the left upper side of filter jar is provided with first connecting pipeline, the outer end of first connecting pipeline is provided with the gear box, the bottom of filter jar is provided with the oil pollution monitor, the downside of filter jar front is provided with the oil pump, is provided with second connecting pipeline between the oil pump and gear box, the right lower side of filter jar is provided with the oil drain pipe, installs solenoid valve on the oil drain pipe, sum up the design to be from, thereby can effectively improve the gear oil cleanliness under the condition of not influencing main oil way lubrication, realizes oil high -efficient recycling, finally reaches the purpose that prolongs equipment life.

The present invention relates to nitrogen-functionalized acrylate-olefin copolymers and methods of making these polymers. The invention also relates to a lubricant composition comprising the above copolymer, and to the use of the copolymer in a lubricating oil composition, the present invention relates to the use as a lubricant additive or a synthetic base fluid in gear oil compositions, transmission oil compositions, hydraulic oil compositions, engine oil compositions, marine oil compositions, industrial lubricating oil compositions or in greases.

The utility model relates to portal crane slewing bearing gear lubrication technical field, especially a kind of portal crane slewing bearing gear lubricating device and portal crane, including support, support top end is installed in turntable bottom, support inside setting solid shaft, solid shaft top end extends to turntable inside and sets up oil nozzle;Solid shaft is installed lubricating gear, and lubricating gear is equipped with gear oil channel, gear oil channel outer end extends to the tooth surface of lubricating gear, solid shaft inside is equipped with lubricating oil channel, lubricating oil channel one end is communicated with oil nozzle, other end is communicated with gear oil channel;The lubricating gear is used to engage with the outer gear ring of slewing bearing;Through support installation in the turntable bottom of the slewing bearing device of portal crane, greatly save manpower cost, the meshing state of gear is improved well, solve the slewing bearing device of portal crane, generally ground height is as high as dozens of meters, the problem of inconvenient lubrication work.

The invention belongs to the technical field of mechanical hydraulic engineering, and discloses a hydraulic electromagnetic valve with valve core position keeping and oil inlet and return switchable functions, which comprises a first oil port, a second oil port, a first one-way valve, a second one-way valve, a first pilot valve, a second pilot valve and a main valve, two inlets of the main valve are respectively communicated with the first oil port and the second oil port, and two outlets of the main valve are respectively connected with a first load and a second load; the first pilot valve and the second pilot valve are connected with control cavities in the two ends of the main valve correspondingly and control connection and disconnection between an inlet and an outlet of the main valve. The first oil port and the second oil port are connected with the first pilot valve and the second pilot valve through the first one-way valve and the second one-way valve respectively. The electromagnetic valve can be used for systems with high safety requirements such as undercarriage oil way on-off, the possibility that the oil way state of the systems such as the undercarriage is abnormal due to sudden oil, electricity and gas faults of an airplane is reduced, and the working safety and reliability of the electromagnetic valve are improved.

The invention belongs to the technical field of lubricating oil and lubricating oil additives, and particularly relates to a mining machinery gear lubricating oil composition as well as a preparation method and application thereof. The lubricating oil composition is prepared from the following raw materials in percentage by mass: 0.1%-1% of a sulfur-containing extreme pressure agent, 0.3%-2.5% of a phosphorus-containing anti-wear agent, 0.2%-1.5% of an antioxidant, 0.03%-0.1% of a metal deactivator, 0.02%-0.08% of an anti-rust agent, 0.02%-0.05% of a composite anti-foaming agent, 0.003%-0.01% of a demulsifier, 0.01%-0.1% of a pour point depressant and the balance of base oil. The special gear oil composition for mines has outstanding high foam inhibition characteristic, excellent extreme pressure wear resistance and corrosion resistance, and excellent low-temperature fluidity and viscosity-temperature characteristic.

The utility model discloses a kind of hydraulic differential lock executor arrangement structures for drive axle, its characteristics are, by differential lock cylinder, hydraulic oil pipe joint, small piston, small piston O-ring, big piston, big piston O-ring, return spring, yoke, differential lock signal switch, reducer shell composition;Differential lock cylinder is connected with reducer shell;Hydraulic oil pipe joint and differential lock signal switch are equipped on differential lock cylinder, and small piston is equipped in the piston hole of differential lock cylinder;Big piston is equipped in the piston hole of reducer shell;Big piston is sleeved with yoke and return spring, return spring one end and yoke end surface contact, the other end and reducer shell end surface contact;With simple structure, hydraulic oil and gear oil independent sealing, high reliability, oil leakage identifiable and the like characteristics;It is suitable for using hydraulic control differential lock work's drive axle assembly.

The utility model relates to the technical field of rolling mills, in particular to a vertical roll bearing waterproof device which comprises a vertical roll, a bearing box and a bearing arranged in the bearing box, a water throwing ring and a water retaining ring are arranged between the lower end of the vertical roll and the bearing box, and the water throwing ring and the water retaining ring are both arranged on the outer side of a vertical roll shaft in a sleeved mode. The water throwing ring is arranged at the end part of the lower end of the vertical roller; the water retaining ring is of a step-shaped structure, the lower end of the water retaining ring extends into the bearing box and is attached to the bearing box, the water retaining ring is connected with the bearing box, and a gap is reserved between the upper end of the water retaining ring and the vertical roller shaft. And a water retaining ring is fixedly arranged at the top of the upper end of the water retaining ring. Emulsion flowing to the lower end of the vertical roll along the roll surface of the vertical roll can be thrown away, the emulsion is effectively prevented from flowing into a bearing box below the vertical roll along the roll surface of the vertical roll, so that damage caused by poor lubrication of a bearing due to deterioration of gear oil is avoided, and the service life of the bearing is prolonged.

A rapid measurement method for oxidation stability of gear oil for a wind farm, comprising the following specific steps: S1, placing a fixed mass of gear oil in a closed environment, and introducing oxygen at a set pressure into the closed environment; and S2, raising the temperature of the closed environment to a set temperature, maintaining a constant temperature, starting timing when the temperature rises, stopping timing when the decreased value of the oxygen pressure in the closed environment occupies a fixed percentage of the maximum pressure, and using the time value to represent the oxidation stability of the gear oil. The method has the advantages of short measurement period, small sample consumption, simple operation, accurate and reliable results, and wide application range, and is of great significance for ensuring the safe operation of devices and improving economic and social benefits.

The method for predicting the oil level of the gear oil in the gear box comprises the steps that the oil level of the gear oil is detected for multiple times in the operation and static process of the gear box, and meanwhile multiple parameters influencing the state of the gear oil are collected, the temperature at least comprises the oil temperature of gear oil in the gear box, and the power and the rotating speed of an oil pump used for pumping the gear oil to enable the gear oil to be cooled in a pipeline outside the gear box and then circulated back to the gear box; performing standardization and normalization processing on the plurality of parameters, and performing training by using SVM and MLP algorithms to obtain a first oil level prediction model and a second oil level prediction model; the multiple parameters are collected multiple times in the operation and static process of the gearbox and input into the first oil level prediction model and the second oil level prediction model respectively to obtain a first oil level prediction value and a second oil level prediction value respectively; and taking the weighted sum of the first and second oil level predicted values as the oil level predicted value of the gear oil in the gearbox. A system for predicting the oil level of gear oil in a gearbox is also presented, which is configured to implement the above method.

The utility model aims to provide a dehydration treatment system for mineral oil, which is simple in structure, can be used for well dehydrating the mineral oil, ensures the separation treatment effect of the mineral oil and the quality of the mineral oil, is different from a centrifugal separation dehydration technology, and can be widely applied to dehydration of hydraulic oil and gear oil. The device is characterized by comprising a vacuum flash tower, an air inlet valve is arranged on the vacuum flash tower, a liquid level transmitter is arranged in the vacuum flash tower, a spray header is arranged at the upper end of the vacuum flash tower and is connected with a liquid inlet through a heater, the lower end of the vacuum flash tower is connected with a liquid outlet through an oil pump, and the liquid outlet is connected with a liquid outlet through an oil pump. And the upper end of the vacuum flash tower is sequentially connected with an air cooling radiator, a gas-water separator and a vacuum pump.

This invention discloses an 8AT automatic transmission hydraulic system, including a first pressure regulating valve, a second pressure regulating valve, a first switching valve, a main oil circuit, a first solenoid valve, a second solenoid valve, a third solenoid valve, a fourth solenoid valve, a fifth solenoid valve, and a sixth solenoid valve. The first and fifth solenoid valves are connected to the forward gear oil circuit, the sixth solenoid valve is connected to the main oil circuit, and the second and fourth solenoid valves are connected to the pressure reducing oil circuit. The first, fifth, third, and sixth solenoid valves are direct-drive solenoid valves, and the second and fourth solenoid valves are pilot-operated solenoid valves. This 8AT automatic transmission hydraulic system uses direct-drive solenoid valves and pilot-operated solenoid valves to control each clutch of the transmission. It utilizes two constant-high pilot-operated solenoid valves to achieve clutch failure modes, simplifying the design of the pressure regulating valve core. The system is simple in structure, compact in design, cost-effective, and reduces the space occupied.

The present application relates to the technical fields of compressor piston rod maintenance, and provides a reciprocating compressor piston rod protection device, which comprises a base, the left side of the base is connected with a bottom plate, the upper part of the bottom plate is provided with an oil tank, an oil pipe connected to the gear oil pump is output from the oil tank, an oil pipe connected to the electromagnetic reversing valve is output from the gear oil pump, an oil pipe connected to the throttle valve is output from the electromagnetic reversing valve, an oil pipe connected to the hydraulic control check valve is output from the throttle valve, an oil pipe connected to the balance valve is output from the hydraulic control check valve, and an oil pipe connected to the lifting oil cylinder is output from the balance valve. The piston rod is placed horizontally between the concave bracket and the upper and lower flaps, and the piston rod in the upper and lower flaps is converted from the horizontal state to the vertical state through the lifting action of the lifting oil cylinder, so that the deflection of the piston rod is prevented from changing, the probability of failure of the piston rod during operation is reduced, and the problem of difficult hoisting when the piston rod is vertically placed is solved.