Scissor lift energy-efficient hydraulic system design scheme

Scissor lifts are in mine construction, mine maintenance and coal transportation more an application handling equipment. It mainly consists of the load almost Desk, sting fork support thumb member base and hydraulic system, etc., work by hydraulic pressure of the hydraulic cylinder output drive rod and the scissor work platform, and achieve a variety of control by the crossing through the system and protection. In the elevator rises when carrying heavy loads. To provide the driving force of the hydraulic cylinder, hydraulic flesh sunglasses lose volume, the rolling clamor foot (taxes mechanical energy) into the gravitational potential energy: while in the lift when the emphasis was to bring down the gravitational potential energy will be released to flooded. This gravitational potential energy efficiency built without lute clothes recycling will result in waste of energy. If you set the energy storage device in the hydraulic system of the machine. The decline can be released during the lift out of the gravitational potential energy stored. And when it rises into hydraulic energy, it can be reused, reducing energy consumption, improve the efficiency of the hydraulic system.

Hydraulic System Design and Analysis

Crossing atrophy system must be able to achieve the lift wells, drop, speed, stay, overload protection and can limp recovery and other functions. And love to seek simple, efficient sea, smooth running, working clap rely on, according to the design of the hydraulic system shown in Figure 1. The system uses accumulators recovery potential, in order to reduce internal leakage from the direction of the valve caused by Cheng lifts slowly sinking dip. With a good two-way valve seal control cylinder direction. Using accumulator recovery potential, its principle is: the elevator descent, the lift cylinder rod chamber towel generated by gravity pressure fluid is discharged into the accumulator, the mechanical potential energy is converted into hydraulic energy. Bear and stored in the accumulator vessel; rise in the potential drop over again Ji Taiwan, the accumulator to the hydraulic oil (equivalent to set up a pressure tank in the system), reduced splash pump, the oil pressure in the foot difference. The ascending process of the pump motor power consumption decreases again. To save energy. Because the lift only apparent movement in the vertical direction. Its decline can be realized by means of gravity, in order to simplify the structure of the fuel tank, lower manufacturing costs, the use of a single-acting cylinders, two cylinders in parallel; the direction of movement of the cylinder valve lO Bo direction control; to improve the two cylinders synchronization accuracy. Using a synchronous circuit by the sub-Luk consisting of a flow valve; to achieve rapid decline set up two two-way tie 7: For the output flow of the pump depression secret teach breaking traffic towards adaptation needs to improve the efficiency of the system, using a formula variable volume by the limited pressure pump drive throttle leaf hairpin tie consisting of a vortex throttle speed ring road: the output pressure of the pump depending on the load, the relief valve 4 is used for system safety valve, relief valve 9 to Bute limit the maximum pressure accumulator when the check valve 6 to lift rises to the highest position. After the pump shut down, closed the lift cylinder rodless Qu, the lift station bears a long time to stay in the work place cook; single melt valve 16 (valve clear sign for the back) for the holding certain minimum pressure in the accumulator, needs work properly. All these considerations designed hydraulic system, management of work processes and principles of the hydraulic system for analysis: force the oil, start the pump 3-way tie decorated l, help tank suction filter 2, then through the throttle valve 5, single the valve 6, two-way valve 10 is a right position and shunt flow valve lift oil into the King ll rodless chamber, the piston law Gu Ping, driving scissors stalk, pushing down the stage show, dance, lift grasshopper velocity The size can be controlled throttle 5.
After the stop ring in a predetermined position of the lifting platform to rise, so that the pump antimony grapes. No thumb Kui Medical rolling short dance drop mandarin duck stuffed produce enzymes vertical force weight oil is a reliable one-way valve 6 closed, lifts can reliably remain in a predetermined position.

The two-way drop Tian Bei of Shu lO l ¥ A magnet is energized to switch to the left position, the cylinder rod chamber of a fluid through the shunt flow valve 11 and the check valve 8 into the accumulator 14. pressure liquid is stored in the accumulator vessel bears. Li l to examine fluid accumulator Yao force, it is filled with the gradual rise. To lift fell over to the braking action. So smooth lowering speed lifts: 3 and because the pump outlet is closed, one-way Min 16 Although dance can express, the pump can not operate as a motor condition Li Li cluster inhalation solution; single trader valve l Because I din inch Dogs on the pressure chamber at chamber also turned off, so that when the elevator fell, hydraulic cylinder rod chamber of the discharged hydraulic oil will not enter the cloud nationals, two are foot-l poison into the reservoir, will be able to ferry Peng Chu Jalan mining deposit.

Rapid decline in emergency circumstances require rapid decline, it can be switched on the electromagnet lYA and 2YA. So that the cylinder rod chamber of fluid through the shunt a set Luk tie l, two-way left-bit mi lO tattoo two two-way valve 7 is turned to the left position lanthanum box, eliminating explain oil resistance, lifts and achieve rapid decline. 8 vend check valve prevents the fluid transducer at this point by the two two-way valve 7 filter nursery tank to store cents sputum still some pressure oil.

Rising again make two-way solenoid valve 10 lYA loss of power. Hydraulic pump 3 to draw lightning stupid some pressure fluid from the accumulator Han (this breed provider of valve l in Guinea is under pressure accumulator oil off), and then by the throttle valve 5 check valve 6, two three lO and diverter valve in case of a flow valve ll into the lift cylinder rodless dirty hoe up soil around plants Cuan desolate piston, rod drive scissor dance, ballad Beng male grasshopper rise moving boat down, lifts the moving speed of the 5 throttle control. Since the suction pump 3 is a certain pressure of the oil. Import and export pressure Mino reduced consumption of Fen Chan Yi cents engine power will be reduced. Ai-chan from real energy conservation, improve the efficiency of energy use. If the lift height is greater than the initial rise again ascent or leak due Cheng is willing to make the reservoir due to foot-l stone roller Polo stupid insufficient amount of oil stored in the hydraulic pump 3 through the check valve l oil from the reservoir.

Select 2 Main Technical Parameters

(1) cylinder row millet analysis obtained by the cylinder stroke S = structural principles and geometric motion lifts | 2 Tibetan flow ratio in the cylinder mounting position m-- mane to strut proximal long distance and support staff: the smell of the distance , mm; n-- strut layers.

(2) in accordance with the principle of energy accumulator pressure accumulator at the end of Li Yi Lin Chu-chu WMv where force p | i} - pressure loss coefficient, seven = 1.1.1.3: donkeys - accumulator operates passenger foot plot, kill m3: shape - lift and load the total weight. N; - lift and load the maximum stroke, mm. l shuttlecock: exposed to the reservoir pressure foot pressure (maximum pressure) at the end of the pet turbid; Cong force (the lowest core strength) of its discharge of oil by the end of the one-way valve 14 (as a back-pressure valve) it is set. To avoid excessive specifications accumulator and decreasing the pressure loss. To about 0.3Mpa appropriate. Inflatable Qu force accumulator can be put Tomio recommended OK.

(3) working volume accumulator capacity accumulator (can row, put the amount of oil) when the elevator dropped from a maximum height to the lowest position should be slightly larger. The hollow cylinder roller stand desolate Huai total volume (equal to the stroke depression and its Element hoop bar area and the number of product cylinder chamber), which according to the calculation formula for the total volume. Due to the use of scissor lift structure. Have a greater stroke amplification. United Pei show lower oil flesh of the working stroke is small, if the system uses liquid Fever relatively stable from the work force, you can reduce the inner diameter of the lift cylinder, and the volume of liquid discharge amount, thereby reducing the required accumulator Sui work volume.

(1) from the scissor lift table work and structural characteristics of the decision, it is necessary to shut Fu Wing income potential and feasibility.

(2) hydraulic accumulator systems can be effectively recovered potential energy recovery lifts decline during the release of potential energy, reducing lift on the boat again, the process of trial enzyme pump power consumption.

(3) The higher operating pressure, Lee's work to reduce the accumulator volume and capacity; proper system design, can shake when implementing recycling castration, but also make the system knot Mei Lu Zhu roll single, smooth operation , reliable, high efficiency,low loss.