CN111350710A - A hydraulic potential energy recovery system for a stepping lift mechanism - Google Patents

Abstract

The invention belongs to an energy recovery system, and particularly relates to a hydraulic potential energy recovery system of a stepping lifting mechanism. The energy-saving hydraulic system comprises a piston plunger type hydraulic cylinder for generating actions, wherein a cylinder body and a piston of the piston plunger type hydraulic cylinder are connected with a load sensitive hydraulic system through hydraulic pipelines, the cylinder body of the piston plunger type hydraulic cylinder is connected with an energy storage group valve table, the load sensitive hydraulic system is matched with the energy storage valve table to control a lifting hydraulic cylinder to enable a walking beam to realize stable work circulation according to the speed required by the process, the energy storage group valve table releases stored high-pressure hydraulic energy to participate in the work of the hydraulic system when the walking beam rises, the output of a system oil pump is reduced to play a role of saving energy, and the hydraulic energy generated by load potential energy is stored when the walking beam falls so as to be released and utilized in the next rising process. The invention has the following remarkable effects: the energy can be saved by more than 60%.

Description

A hydraulic potential energy recovery system for a stepping lift mechanism

technical field

The invention belongs to an energy recovery system, in particular to a hydraulic potential energy recovery system of a stepping lift mechanism.

Background technique

Walking beam type stepping mechanism is often used in lifting and conveying machinery. It is widely used in metallurgical plants and large workpiece production due to its advantages of large bearing capacity, stable and reliable operation, such as billet transportation in metallurgical plants, steel coil transportation, and manufacturing plants. Among them, the stepping mechanism of the stepping billet heating furnace is the most typical and the most widely used.

In order to reduce costs and wear parts, the prior art uses existing equipment to transform to form a stepping mechanism, the specific content of which is disclosed in the patent application document with application number CN201220200229.6.

This prior art is only a simple improvement on the original machine, and has the following defects: 1. The counterweight hydraulic cylinder is used to replace part of the original system lifting hydraulic cylinder, and the working conditions are complicated; 2. The energy consumption and equipment loss are still relatively large.

Therefore, there is a need for a new hydraulic potential energy recovery system for the stepping lift mechanism.

SUMMARY OF THE INVENTION

Aiming at the defects of the prior art, the present invention provides a hydraulic potential energy recovery system of a stepping lifting mechanism.

The present invention is realized as follows: a hydraulic potential energy recovery system for a stepping lift mechanism, which includes a piston-piston-type hydraulic cylinder for generating action, and the cylinder body and the piston of the piston-piston-type hydraulic cylinder pass through hydraulic pipelines It is connected with the load-sensitive hydraulic system, and the cylinder body of the piston-piston hydraulic cylinder is connected with the valve table of the energy storage group, wherein the load-sensitive hydraulic system cooperates with the valve table of the energy storage group to control the lifting hydraulic cylinder to make the walking beam According to the speed required by the process to achieve a stable working cycle, the valve table of the energy storage group releases the stored high-pressure hydraulic energy when the walking beam rises to participate in the work of the hydraulic system, reduces the output of the system oil pump, and stores the load potential energy when the walking beam descends generated hydraulic energy.

A hydraulic potential energy recovery system for a stepping lift mechanism as described above, wherein the load-sensitive hydraulic system includes a proportional reversing valve, the proportional reversing valve receives a signal from the outside, and converts the external signal into a pressure signal, respectively Act on the piston plunger hydraulic cylinder through a hydraulic control check valve.

In the above-mentioned hydraulic potential energy recovery system of a stepping lift mechanism, a pressure feedback system is set on the proportional reversing valve to reduce the pressure difference between the input and the output.

A hydraulic potential energy recovery system for a stepping lift mechanism as described above, wherein the pressure feedback system includes a separate shuttle valve, and both ends of the shuttle valve are communicated with the two outputs of the proportional reversing valve , the intermediate feedback point of the shuttle valve is connected with the pressure compensator, and the output of the pressure compensator is connected with the P point of the proportional reversing valve.

In the above-mentioned system for recovering hydraulic potential energy of a stepping lift mechanism, a balance valve is further provided between the proportional reversing valve and the hydraulically controlled one-way valve.

A hydraulic potential energy recovery system for a stepping lift mechanism as described above, wherein the valve table of the energy storage group includes a two-position four-way solenoid valve, and the two-position four-way solenoid valve is used to receive an external signal, and according to the external signal The situation gives mutually exclusive two-way outputs, the two-position four-way solenoid valve is connected with the two-way hydraulic control solenoid valve, and the two-way hydraulic control solenoid valve selects to activate the two-way output according to the output of the two-position four-way solenoid valve In a certain way of the oil circuit, the two outputs of the two-way hydraulic control solenoid valve are respectively connected with the low-pressure accumulator group and the high-pressure accumulator group. Since the signals output by the two-position four-way solenoid valve are mutually exclusive, the low-pressure The accumulator group and the high-pressure accumulator group can be connected only one way.

In the above-mentioned hydraulic potential energy recovery system of a stepping lift mechanism, the low-pressure accumulator group and the high-pressure accumulator group further comprise relays for detecting the pressure of the accumulator group, respectively.

A hydraulic potential energy recovery system for a stepping lift mechanism as described above, wherein the oil replenishment system also includes a high-pressure accumulator group and a low-pressure accumulator group, including an oil-filling pump, a drive motor, and an electromagnetic reversing valve. The electromagnetic reversing valve is used to start the process of replenishing oil to the high-pressure accumulator group and the low-pressure accumulator group.

A hydraulic potential energy recovery system for a stepping lift mechanism as described above, wherein there are two groups of the piston-piston hydraulic cylinders, which replace the two lifting hydraulic cylinders of the original hydraulic system, and their installation dimensions are exactly the same.

The significant effects of the present invention are: (1) The technology uses a piston plunger hydraulic cylinder to replace the lifting hydraulic cylinder of the original system, and a single hydraulic cylinder can be used to complete the lifting and lowering process of the walking beam, and the system structure is simple. A similar patent uses a counterweight hydraulic cylinder to replace part of the lifting hydraulic cylinder, that is, a combination of two hydraulic cylinders is used to complete the lifting and lowering process of the walking beam.

(2) This technology adopts two sets of accumulator groups, which are divided into high-pressure accumulator groups and low-pressure accumulator groups. In the process of lifting and lowering, it corresponds to two operating conditions of low load (only the weight of the walking beam mechanism) and full load (the total weight of the walking beam plus the billet), so that the hydraulic system can better adapt to the system work. The pressure change caused by the load change makes the system work more smoothly.

(3) According to the design example, after the technology is transformed, the hydraulic system only needs to use one oil pump to meet the power demand of the equipment operation, which can realize energy saving of more than 60%, which is higher than the energy saving effect of similar patents. The use of this patented system can reduce one oil pump (motor), from 4 uses and 1 backup to 3 uses and 1 backup, saving about 25% of energy. After such a counterweight hydraulic cylinder technical transformation, the walking beam lifting system is still The technology can be used for further transformation to further realize energy saving.

Description of drawings

Fig. 1 is the logical structure schematic diagram of the hydraulic potential energy recovery system of the stepping lift mechanism of the present application;

Figure 2 is a schematic structural diagram of a load-sensing hydraulic system;

Fig. 3 is the structural schematic diagram of the valve table of the energy storage group;

Figure 4 is a schematic diagram of the electrical control principle;

FIG. 5 is a schematic diagram of control.

In the picture: 1. Load-sensitive hydraulic system, 2. Energy storage group valve table, 3. Pressure compensator, 4. Proportional reversing valve, 5. Balance valve, 6. Piston plunger hydraulic cylinder, 7. Hydraulic pipeline, 8. Hydraulic control check valve, 16. Two-position four-way solenoid valve, 17. Two-way hydraulic control solenoid valve, 18. Pressure reducing valve, 19.2/19.1-electromagnetic reversing valve, 20. Hydraulic control check valve, 21. One-way speed regulating valve, 28. Pressure measuring joint, 29. Pressure measuring hose, 31.1/31.2-pressure relay, 32. Accumulator safety ball valve, 33. Bladder accumulator, 40. Low pressure accumulator group, 50. High pressure accumulator group,

Detailed ways

As shown in Figures 1-4, a hydraulic potential energy recovery system for a stepping lift mechanism includes a piston-piston-type hydraulic cylinder 6 for generating action, and the cylinder body and piston of the piston-piston-type hydraulic cylinder 6 are hydraulic The pipeline 7 is connected with the load-sensitive hydraulic system 1, and the cylinder of the piston-plunger hydraulic cylinder 6 is connected with the valve table 2 of the energy storage group. The feeding beam realizes a stable working cycle according to the speed required by the process. The valve table 2 of the energy storage group releases the stored high-pressure hydraulic energy when the walking beam rises to participate in the work of the hydraulic system, reducing the output of the system oil pump and saving energy. , when the walking beam descends, the hydraulic energy generated by the load potential energy is stored for release and utilization in the next ascending process.

The load-sensitive hydraulic system 1 includes a proportional reversing valve 4, which receives a signal from the outside, converts the external signal into a pressure signal, and acts on the piston plunger hydraulic pressure through the hydraulic control check valve 8 respectively. on cylinder 6.

A pressure feedback system is set on the proportional reversing valve 4 for reducing the pressure difference between the input and the output.

The pressure feedback system is set up in this way, a separate shuttle valve is set, the two ends of the shuttle valve are connected with the two outputs of the proportional reversing valve 4, the intermediate feedback point of the shuttle valve is connected with the pressure compensator 3, and the pressure compensation The output of the device 3 is connected to the point P of the proportional reversing valve 4 .

A balance valve 5 is also arranged between the proportional reversing valve 4 and the hydraulically controlled one-way valve 8 .

The valve table 2 of the energy storage group includes a two-position four-way solenoid valve 16, which is used to receive external signals and provide mutually exclusive two-way outputs according to the external signal conditions. The solenoid valve 16 is connected with the two-way hydraulic control solenoid valve 17. The two-way hydraulic control solenoid valve 17 selects and activates one of the two output oil circuits according to the output of the two-position four-way solenoid valve 16, and the two-way hydraulic control solenoid valve 17 outputs. The low-pressure accumulator group 40 and the high-pressure accumulator group 50 are respectively connected. Since the signals output by the two-position four-way solenoid valve 16 are mutually exclusive, the low-pressure accumulator group 40 and the high-pressure accumulator group 50 can only be connected in one way. .

The valve table 2 of the accumulator group further includes a relay for detecting the pressure of the accumulator group (40, 50).

The valve table 2 of the accumulator group further includes an electromagnetic reversing valve, and the electromagnetic reversing valve is used to start the process of supplying oil to the high-pressure accumulator group 50 and the low-pressure accumulator group 40 .

The said piston-plunger hydraulic cylinders 6 consist of two groups, which replace the two lifting hydraulic cylinders of the original hydraulic system.

In layman's terms, the load-sensing hydraulic system 1 includes the following functions:

1) 3-pressure compensator, 4-proportional reversing valve: including pressure compensating valve and shuttle valve. When rising, the pressure at 1 point is large, when falling, the pressure at 3 points is large) through the 2 points and the circuit, the pressure signal on the larger side is transmitted to the pressure compensation valve to the P point of the 4-proportional reversing valve, so that it passes through the 4- The outputs A and B of the proportional reversing valve correspond to the aforementioned points 1 and 3 respectively, thus reducing the pressure difference between the input and output of the 4-proportional reversing valve, stabilizing the working characteristics of the proportional valve, and thus The impact of load changes on system pressure is reduced, which is a load-sensitive hydraulic system.

2) 5-Balance valve: ① If the hose or pipeline fails, prevent the load from falling; ② Prevent the load drift due to the leakage of the directional control valve spool valve; ③ No leakage load retention. When descending under load gravity, prevent the load from falling rapidly.

3) 8-Hydraulic control check valve: It is used to maintain the hydraulic lock in position, and to position the oil cylinder when the reversing valve is in the neutral position, and at the same time play a safety role.

The specific functions of the valve table 2 of the energy storage group are as follows:

16-two-position four-way solenoid valve controls 17-two-way hydraulic control solenoid valve to realize 40-low pressure accumulator group and 50-high pressure accumulator group respectively under light load (before lifting the billet and after putting down the billet, only stepping The flow process of the pressure oil between the 6-piston plunger hydraulic cylinder and the 6-piston plunger hydraulic cylinder in a total of 4 lifting and lowering processes of the beam weight lifting and lowering process) and heavy load (the lifting and lowering process of all the weight of the walking beam plus the billet), namely Realization: Walking beam ascent and descent process. ① DT7 is powered on, the pressure oil opens the 17.2-two-way hydraulic control solenoid valve, so that the 40-low pressure accumulator group fills the hydraulic cylinder with oil, and cooperates with the load-sensitive hydraulic system to complete the lifting process of the hydraulic cylinder under light load; ② When the walking beam is raised When the billet is lifted, DT7 loses power, turns off the 17.2-two-way hydraulic control solenoid valve, DT8 is powered on, and the pressure oil opens the 17.1-two-way hydraulic control solenoid valve, so that the 50-high pressure accumulator group fills the hydraulic cylinder with oil, Cooperate with the load-sensitive hydraulic system to complete the heavy-load lifting process of the hydraulic cylinder, and the DT8 loses power; after the walking beam rises to the highest point and keeps the walking beam translation time (the translation process of the walking beam is completed by the original system), the load-sensitive hydraulic system The action walking beam begins to descend. ③ When DT8 is powered on, the pressure oil opens the 17.1-two-way hydraulic control solenoid valve, so that the hydraulic cylinder fills the 50-high pressure accumulator group with pressure oil, that is, the high pressure energy in the hydraulic cylinder is stored in the high pressure accumulator; ④ Walking beam Descend to the midpoint (put down the billet), DT8 loses power and shuts off 17.1-two-way hydraulic solenoid valve, DT7 is energized, the pressure oil opens 17.2-two-way hydraulic control solenoid valve, and the hydraulic cylinder charges the 40-low pressure accumulator group with pressure Oil, until the walking beam drops to the lowest point, DT7 loses power, shuts off the 17.2-two-way hydraulic control solenoid valve, and completes the oil filling process of the low-pressure accumulator group; the walking beam starts to translate back to the starting point (the translation process is performed by the original system Completed), stop for an intermittent time of the production rhythm, and then repeat the above steps in turn to complete the process of the next lifting and lowering cycle, so that the reciprocating cycle completes the step-by-step movement of the billet in the furnace.

During the working process, the 31.1/31.2-pressure relay detects the pressure of the 33.1/33.3-high pressure/low pressure accumulator group respectively. When the accumulator pressure drops to the minimum set value, it will send a signal to control the 24-gear pump group (supplementary). Oil pump, 1 use and 1 backup) start, (25-electromagnetic relief valve plays the role of protecting the oil pump), by controlling 19.2/19.1-electromagnetic reversing valve, DT5/DT3 is powered, which can be respectively supplied to 50-high pressure accumulator group And 40-low pressure accumulator group oil replenishment to realize the accumulator oil replenishment function.

18- Pressure relief valve, reduces the oil pressure provided by the charge pump to meet the needs of the low pressure accumulator bank.

20-Hydraulic control check valve is used to maintain the pressure of the accumulator group. When DT6/DT4 is energized, the accumulator group can be drained.

21- One-way speed regulating valve, the accumulator group will not be affected when the oil is replenished, preventing the accumulator from draining oil too fast.

28 - Pressure tap for connecting a pressure gauge or pressure sensor.

29 - Pressure measuring hose for connecting a pressure gauge or pressure sensor.

32 - Accumulator safety ball valve, which can adjust the working pressure of the accumulator and play a safety role.

33 - Bladder accumulator, the main energy storage device of this energy-saving system, releases the stored high-pressure hydraulic energy when the walking beam rises to participate in the work of the hydraulic system, reduces the output of the system oil pump and saves energy. The hydraulic energy generated by the potential energy of the load is stored for use in the next ascending process.

In addition to the above-mentioned main components, the application can also include electrical control systems, which include circuit breakers, contactors, switching power supplies, thermal relays, fuses, three-phase sockets, relays, industrial touch screens, PLC (central Control cabinet composed of processing unit, digital input and output unit, analog input unit), transfer switch, emergency stop switch, button switch, buzzer and other components. The connections between the various components are shown in Figure 4.

The function and function of the components: the circuit breaker QS1 is used to control the power supply of the main circuit, QF1 is used to control the power supply of the 1# charge pump motor, QF2 is used to control the power supply of the 2# charge pump motor, QF3 is used to control the PLC power supply, and QF4 is used to control other External DC24V component power supply; contactor KM1 is used to control the start and stop of the 1# charge pump motor, and contactor KM2 is used to control the 2# charge pump motor to start and stop; the switching power supply is used for PLC and other DC24V components to supply power; thermal relay is used for oil replenishment Motor overcurrent protection; fuse is used for DC24V component overcurrent protection; relays KA1 and KA2 control the start and stop of the 1# and 2# charge pump motors respectively, KA3 and KA4 respectively control the action of the electromagnetic relief valve of the 1# and 2# pumps, KA5 and KA5 KA6 controls the action of the low-storage oil drain solenoid valve and the low-storage oil-filling solenoid valve respectively, KA7 and KA8 control the action of the high-storage oil-drain solenoid valve and the high-storage oil-filling solenoid valve respectively, and KA9 and KA10 control the low-storage solenoid valve and the high-storage oil solenoid valve respectively. Storage solenoid valve action, KA11 is used to control the oil solenoid valve action, other relays are for backup; industrial touch screen is used for on-site operation and troubleshooting by operators; PLC is used for signal acquisition and logic control of on-site control components; transfer switches, The functions of emergency stop switch, push button switch, buzzer and other components are shown in the panel control diagram.

In order to facilitate the staff to observe and operate the system, the data of the system of the present application can be compiled into electronic data and displayed by a computer, as shown in FIG. 5 .

9.1 and 9.2 in the figure are pressure gauge ports; 5.1 and 5.2 are balance valves, described in function 2) above; DN32 is the diameter of the pipeline; (20bar is the pipeline pressure).

Claims (9)

1. The utility model provides a step-by-step elevating system hydraulic pressure potential energy recovery system which characterized in that: the hydraulic system comprises a piston plunger type hydraulic cylinder (6) used for generating actions, wherein a cylinder body and a piston of the piston plunger type hydraulic cylinder (6) are connected with a load sensitive hydraulic system (1) through a hydraulic pipeline (7), the cylinder body of the piston plunger type hydraulic cylinder (6) is connected with an energy storage group valve table (2), the load sensitive hydraulic system (1) and the energy storage group valve table (2) are matched to control a lifting hydraulic cylinder to enable a walking beam to realize stable working circulation according to the speed required by the process, the energy storage group valve table (2) releases stored high-pressure hydraulic energy to participate in the work of the hydraulic system when the walking beam rises, the output of a system oil pump is reduced, and the hydraulic energy generated by load potential energy is stored when the walking beam descends.

2. The stepping lifting mechanism hydraulic potential energy recovery system as claimed in claim 1, wherein: the load-sensitive hydraulic system (1) comprises a proportional reversing valve (4), wherein the proportional reversing valve (4) receives signals from the outside, converts the external signals into pressure signals and acts on the piston plunger type hydraulic cylinder (6) through a hydraulic control one-way valve (8) respectively.

3. A step lift mechanism hydraulic potential energy recovery system as recited in claim 2, wherein: a pressure feedback system is arranged on the proportional directional valve (4) and used for reducing the pressure difference between the input and the output.

4. A step lift mechanism hydraulic potential energy recovery system as recited in claim 3 wherein: the pressure feedback system comprises an independent shuttle valve, two ends of the shuttle valve are communicated with two paths of outputs of the proportional reversing valve (4), a middle feedback point of the shuttle valve is connected with a pressure compensator (3), and the output of the pressure compensator (3) is connected with a point P of the proportional reversing valve (4).

5. The stepping lifting mechanism hydraulic potential energy recovery system as claimed in claim 4, wherein: and a balance valve (5) is also arranged between the proportional reversing valve (4) and the hydraulic control one-way valve (8).

6. A stepping elevating mechanism hydraulic potential energy recovery system according to claim 1 or 2, characterized in that: the energy storage group valve platform (2) comprises a two-position four-way electromagnetic valve (16), the two-position four-way electromagnetic valve (16) is used for receiving external signals and giving out two ways of output of mutual exclusion according to the external signal condition, the two-position four-way electromagnetic valve (16) is connected with a two-way hydraulic control electromagnetic valve (17), the two-way hydraulic control electromagnetic valve (17) selects and starts a certain way of two ways of output oil paths according to the output of the two-position four-way electromagnetic valve (16), the two ways of output of the two-way hydraulic control electromagnetic valve (17) are respectively communicated with a low-pressure energy accumulator group (40) and a high-pressure energy accumulator group (50), and the signals output by the two-position four-way electromagnetic valve (16) are mutually exclusive, and the low.

7. The stepping lifting mechanism hydraulic potential energy recovery system as claimed in claim 6, wherein: the accumulator group valve station (2) further comprises a relay for detecting the pressure of the accumulator groups (40, 50).

8. A step lift mechanism hydraulic potential energy recovery system as recited in claim 7, wherein: the energy storage group valve table (2) further comprises an electromagnetic directional valve, and the electromagnetic directional valve is used for starting the process of supplementing oil to the high-pressure energy storage group (50) and the low-pressure energy storage group (40).

9. A step lift mechanism hydraulic potential energy recovery system as recited in claim 8, wherein: the piston plunger type hydraulic cylinders (6) are 2 groups in total, two lifting hydraulic cylinders of an original hydraulic system are replaced, and the installation sizes of the two lifting hydraulic cylinders are completely the same.

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