100T四柱液壓機液壓系統(tǒng)設計【帶CAD圖紙、開題報告、說明書文檔】,帶CAD圖紙、開題報告、說明書文檔,液壓機,液壓,系統(tǒng),設計,cad,圖紙,開題,報告,講演,呈文,說明書,仿單,文檔 Four-column hydraulic press 1.Four-column hydraulic press used ????Four-column hydraulic press for plastic materials in the pressing process. Products such as powder molding, plastic molding, cold (hot) extrusion of metal forming, sheet tension and transverse compression, bending pressure, turn through, correction. process 2.Four-column Hydraulic Press Features Four-column hydraulic press with an independent power sector and the electrical system, using the button focus control enables adjustment, manual and semi-automatic three kinds of work: Four-column hydraulic pressure of work, pressing speed, load fast and slow down the schedule and the scope of may need to be adjusted according to process and can complete the top of the process, can take the top out of process, drawing process three kinds of process methods, each process has to be pressure, will be two-way action for the selection process, constant pressure molding process After the suppression of a delay with the top and automatic return. Four-column hydraulic characteristics. Four-column hydraulic press is the use of pressure compression forming objects. Is used to provide medium pressure hydraulic oil. Four-column hydraulic machine structure is simple and economical, practical. Appearance by octagonal shape. Four-column hydraulic press control electrical box with glass doors, PLC or computer control two general appliances, with reliable, reliable, direct action, and maintenance. Centralized control of the independent button. With the adjustment, his hands a single cycle of two kinds of operation mode. Four-column Hydraulic Press Hydraulic Control Valve can be used integrated system, and reliability, long life, small hydraulic impact, reducing the connecting pipe and the leak point, or common hydraulic control two. ? 3. Four-column hydraulic machine failure and maintenance of the common methods ?? Four-column hydraulic machine failure and maintenance of the common methods: in the winter and the worse condition, should be ground on the four-column hydraulic system inspection, ground maintenance, oil change jobs often. Four-column hydraulic press work on the oil storage and transfer should be very much attention. Sheng drums plus special signs should be up and cover. In the winter, do not pay attention to the barrel while the result of the air condensed into water mixed with oil, not to be rusty rust bucket leather pieces into bins. Winter on the column hydraulic machine engine and other mechanical systems to the various preventive measures such as cover frost, heat insulation, for work with low viscosity oil, are suitable for hydraulic systems. ????In the Four-column hydraulic press hydraulic transmission system, are some of the more sophisticated parts. People on the four-column hydraulic machine hydraulic felt like labor-saving convenience, but at the same time feel that it is easy to damage. The reason is not clear column hydraulic main working principle and structure characteristics, which do not quite understand the preventive maintenance approach. Hydraulic system has three basic "causative" factors: pollution, over-heated and into the air. These three negative factors has close relationship, there any one issue, it will create another one or more related problems. From the practice shows that 75% of hydraulic system "disease" because, were caused by these three. 1, four column hydraulic press working oil into the dirt and deterioration due to 2, overheating 3 solution into the air: The Four-column hydraulic system some of the major precision parts cleaning and assembly, shall be carried out in a very clean room, indoor should be have clean floors and windows and doors closed, the temperature is best maintained at around 200C. 4. Four-column hydraulic machine common method of general maintenance ?? Four-column hydraulic press common method of general maintenance ??(1) Four-column hydraulic press action, or failure of electrical wiring is not strong then check the electrical fault ??????(2) Four-column hydraulic press slider creeping accumulation of air or a system, two precision air pump to adjust properly or check the pump suction column short of petroleum and an air intake pipe is then repeatedly pressurized two columns up and down movement and add oil, re- adjustment accuracy ??????(3) Four-column hydraulic press with pressure when the slide slow down its support for excessive back-pressure valve to the cylinder to adjust the cavity without pressure, the maximum not more than 1MPa, four column hydraulic press, after stopping a serious one slipped under the brim slide 2 pressure valve seal ring leakage pressure adjustment is too small or the pressure I strictly an observation brim, hair oil deflated to adjust pressure Check Valve 2 5. Four-column hydraulic pressure gauge pointer swings a powerful memory with air pressure gauge oil line pipe mechanical vibration 3 2 1 on the pressure gauge when the damage slightly loosen the fittings, gas discharge tube card 2 will replace the pressure gauge in prison 3 6. Four-column hydraulic machine travel speed is not enough pressure, the pressure behind a high-pressure pump flow adjustment too small 2 pump wear or leakage of serious burns 3 system 1 according to the instructions to adjust pump, the pump in the eccentricity 25MPa adjustable adjusted to 5 Georgia 2 If the pump back to the oil port leakage is large, should remove the check 7. Four-column hydraulic packing pressure drop is too fast when 1 is involved in the packing of loose or pipe leaking valve 2-cylinder liquid-filled seal ring damage a check valve, keeping the pressure relief valve of the sealed joint case study 2 replacement seal ring 8. On the spiral column hydraulic machine ??On the spiral column hydraulic machine: ????This practical spiral column hydraulic machine, hydraulic machine in the field are involved, with special hydraulic screw drive, its mission is to provide a transmission device so that the main nut thread Zhi suppress the slide workpiece leverage, repression at the slider Fei workpiece trip, the main thrust nut from the role of hydraulic cylinders, so that oil pressure is sufficient to the spiral plane. The spiral column hydraulic machine, screw position in the central axis of the fuselage and through the bearings installed in the camera body, screw top and one inertia wheel connected to the main nut on the screw with the lower section of the main slide through the main flange and connected to one; nut with the screw midway through the Deputy Vice-flange and connected to one slide, spiral column hydraulic machine to the central axis of symmetry installation guide, the main slide, slide along the guide rail sliding connection vice, hydraulic cylinder to the central axis of body symmetry installed in the camera body, the hydraulic cylinder piston rod end of the slider hinge connection with the Deputy, can improve the nut, screw lubricating conditions, to extend the life of spiral column hydraulic machine. Hydraulic Four-column hydraulic machine on the station: Four-column hydraulic press hydraulic station works as follows: motor driven rotary pump, the pump suction from the tank after the Da You, the mechanical energy into hydraulic oil pressure to hydraulic oil through the manifold block (or valve combination ) is to achieve the direction of hydraulic valves, pressure, flow regulation by external piping after the transfer to the hydraulic cylinder or mechanical motor oil, thus controlling the direction of the transformation of liquid motivation, strength and speed of the size and promote a variety of hydraulic mechanical work. Four-column hydraulic press hydraulic station, also known as hydraulic pump station, is an independent hydraulic unit. It is required by the host oil supply, and control the direction of oil flow, pressure and flow, it applies to the host and the various hydraulic loading detachable column hydraulic machines. After the user purchases as long as the pressure points and the host will be the implementing agency (tank or oil motor) is connected with pipes, hydraulic machinery can achieve the various provisions of the movement, the work cycle. Four-column hydraulic press hydraulic station by the pump, manifold block or valve combination, fuel tank, electrical box combination. Function of each part as follows: Pump device - equipped with motors and pumps, it is the Four-column Hydraulic Press Hydraulic station power source, the mechanical energy into hydraulic fluid pressure energy. Manifold - hydraulic valves and passages from the assembled body. The implementation of its direction of hydraulic oil, pressure, flow regulation. Valve combination - is the plate valve installed in the stand-board, board after the tube connections, and integrated block the same function. ?Fuel tank - is half-closed container plate welding, also equipped with air filter oil filtering network and so on, it used oil, oil cooling and filtering. ?? Electrical box - divided in two forms. A kind of set the external lead terminal board; one is equipped with a full set of control appliances. Four-column hydraulic pressure small what reasons: ??Four-column hydraulic pressure small reasons: ??1. Four-column oil hydraulic cylinder dirty it? ??2. Pressureout it? Pressure started? ?3. Four-column hydraulic machine a long time, with the loose parts, within the vent it? ??1, four column hydraulic pump wear serious leak within the major. ??2, relief valve failure, is always open. ??3, the direction of valve internal leakage big. ?4, four column hydraulic press in the implementation of the original leak, suggesting a small pump pressure. Four-column Hydraulic Press Hydraulic Forming Process Applications ?? Column hydraulic machine hydraulic forming process in the automotive, aviation, space and plumbing industries has been widely used, column hydraulic machine hydraulic forming process is mainly applied to: changes along the component axis round, rectangular, or shaped cross section hollow structural parts, such as car Special-shaped pieces of the exhaust system; non-circular cross section hollow frameworks, such as engine brackets, instrument panel frame, body frame (about 11% of car quality to 15%); hollow shaft and complex pipe fittings. About four column hydraulic press is not holding pressure problems. Q: Four-column hydraulic press is not up, start-up switch has 10MM action, increased and then not holding pressure, sliding body of work down, how is it? Answer: First check the column hydraulic pump outlet pressure, pressure control system, support valve is stuck. ??? Piston down and the inferior vena not support force, not holding pressure may be four column hydraulic relief valve leakage. ???Four-column hydraulic press system is relatively simple, the first not considered too much trouble to repair Four-column hydraulic presses and pneumatic presses the difference between ?? Four-column hydraulic presses and pneumatic presses, pneumatic machines have different noise power is small, and easy maintenance will not leak; column hydraulic machine quiet, strong and maintenance of little more complicated. Mainly depends on application. Steel plant noise already relatively large, and may from time to consider the noise factor. If the power requirements of larger, then select column hydraulic machine. If the strength requirement is not so big (50kg less bar) air pressure very good, also cheap. ?? Four-cylinder in the hydraulic tension cylinder with fast speed up to 280mm / s, tensile strength up to 1000KN, BHF up 800KN, speed and pressure can be adjusted within the specified scope, the user can be required to pull extension speed and blank holder force selection to the best working condition, can be drawing a higher quality stainless steel and other products, is the ideal equipment for sheet drawing. The four-column hydraulic press hydraulic chamber fuel injection system required to meet the requirements of hydraulic forming process, while the system is not too complicated. Its action as follows: motor starter, oil pump to flow back into the tank by the valve in place, pump unloading. When 1DT power, the oil through the valve, check valve into the grease board will be pressed into the sheet metal forming die and. In forming the end, 1DT power, 2DT power, oil and grease through the pressure cylinder into the board's role in the high pressure under the sheet to further close the die and forming the small fillet. The Four-column hydraulic press hydraulic system is the key converter 5 and the pressure cylinder 10. Hydroforming, according to the needs of technology, hydraulic system provides hydraulic pressure chamber to flow and pressure of work should be constantly changing, so the hydraulic system The power consumption should also be working with the work flow and pressure changes constantly changing Before embarking on the analysis of pressure transient phenomena and the derivation of the appropriate wave equations,it will be usefull to describe the general mechanism of pressure propagation by reference to the events fllowing the instantaneous closure of a value postioned at the med-length point of a frictionless pipeline carrying fluid between two reservoirs.The two pipeline sections upstream and downstream of the value are identical in all respects.Transient pressure waves will be propagated in both pipes by valve operation and it will be assumed that rate of value closure precludes the use of rigid column theory. As the valve is closed,so the fluide approaching its upstream face is retarded with a consequent compression of the flude and an expansion od the pipe cross-section.The increase in pressure at the valve results in a pressure wave being propagated upstream which conveys the retardation of flow to the column of fluid approaching the valve along the upstream pipeline.This pressure wave travels through the fluid at the appropriate sonic velocity,which will be shown to depend on the properties of the fluid and the pipe material. Similarly,on the downstream side of the valve the retardation of flow results in a reduction in pressure at the valve,with the result that a negative pressure waves is propagated along the downstream pipe which,in turn,retards the fluid flow.It will be assumed that this pressure drop in the downstream pipe is insufficient to reduce the fluid pressure to either its vapour pressure or its dissolved gas release pressure,which maybe considerable different. Thus,closure of the valve results in propagation of pressure waves along both pipes and,although these waves are of different sign relative to the steady pressure in the pipe prior to valve operation,the effect is to retard the flow in both pipe sections.The pipe itself is affected by the wave propagation as the upstream pipe swells as the pressure rise wave passes along it,while the downstream pipe contracts due to the passage of the pressure reducting wave.The magnitude of the deformation of the pipe cross-section depends on the pipe material and can be well demonstrated if,for example,thin-walled rubber tubing is employed.The passage of the pressure wave through the fluid is preceded,in practice,by a strain wave propagating along the pipe wall at a velocity close to the sonic velocity in the pipe material.However,this is a secondary effect and,while knowledge of its existence can explain some parts of a pressure-time trace following valve closure,it has little effect on the pressure levels generated in practical transient situations. Following valve closure,the subsequent pressure-time history will depend on the conditions prevailing at the boundaries of the system.In order to describe the events following valve closure in the simple pipe system outlined above,it will be easier to refer to a series of diagrams illustrating conditions in the pipe at a number of time steps. Assuming that valve closure was instantaneous,the fluid adjacent to the valve in each pipe would have been brought to rest and pressure waves conveying this information would have been propagated at each pipe at the appropriate sonic velocity c.At a later time t,the situation is as shown in fig.The wavefronts having moved a distance 1=ct,in each pipe,the deformation of the pipe cross-section will also have traveled a distancel as shown. The pressure waves reach the reservoirs terminating the pipes at a time t=1/c.at this instant,an unbalanced situation arises at the pipe-reservior junction,as it is clearly impossible for the layer of fluid adjacent to the reservoir inlet to maintain a pressure different to that prevailing at that depth in the reservoir.Hence,a restoring pressure wave having a magnitude suffcient to bring the pipeline pressure back to its value prior to valve closure is transmitted from each reservoit at a time 1/c.For the upstream pipe,this means that a pressure wave is propagated towards the closed valve,reducing the pipe pressure to its original value and restoring the pipe cross-section.The propagation of this wave also preduces a fluid flow from the pipe into the reservoir as the pipe ahead of the moving wave is at a higher pressure than the reservoir.Now,as the system is assumed to be frictionless,the magnitude of this reversed flow will be the exact opposite of the original flow velocity,as shown in fig. At the downstream reservoir,the converse occurs,resulting in the propagation of a pressure rise wave towards the valve and the establishment of a flow from the downstream reservoir towards the valve. For the simple pipe considered here,the restoring pressure waves in both pipes reach the valve at a time 21/c.The whole of the upstream pipe has,thus,been returned to its original pressure and a flow has been established out of the pipe.At time 21/c,as the wave has reached the valve,there remains no fluid ahead of the wave to support the reversed flow.A low pressure region,therefore,forms at the valve,destroying the flow and giving rise to a pressure reducing wave which is transmitted upstream from the valve,once again bringing the flow to rest along the pipe and reducing the pressure within the pipe .It is assumed that the pressure drop at the valve is insufficient to reduce the pressure to the fluid vapour pressure.As the system has been assumed to be frictionless,all the waves will have the same absolute magnitude and will be equal to the pressure increment,above steady running pressure,generated by the closure of the valve.If this pressure increment is h,then all the waves propagating will be±h,Thus,the wave propagation upstream from the valve at time 21/c has a value-h,and reduces all points along the pipe to –h below the initial pressure by the time it reachs the upstream reservoir at time 31/c. Similarly,the restoring wave from the downstream reservoir that reached the valve at time 21/c had established a reversed flow along the downstream pipe towards the closed valve .This is brought to rest at the valve,with a consequent rise in pressure which is transmitted.downstream as a +h wave arriving at the downstream reservoir at 31/c,at which time the whole of the downstream pipe is at pressure +h above the initial pressure whth the fuid at rest. Thus,at time 31/c an unbalanced situation similar to the situation at t=1/c again arises at the reservoir –pipe junctions with the difference that it is the upstream pipe which is at a pressure below the reservoir pressure and the downstream pipe that is above reservoir pressure .However,the mechanism of restoring wave propagation is identical with that at t=1/c,resulting in a-h wave being transmitted from the upstream reservior,which effectively restores conditions along the pipe to their initial state,and a+h wave being propagated upstream from the downstream reservoir,which establishes a flow out of the downstre