Stepping beam potential energy recovery energy-saving hydraulic system

Abstract

The utility model discloses a walking beam potential energy recovery energy-saving hydraulic system, and belongs to the technical field of hydraulic pressure. The system comprises a control system, a hydraulic pump, an oil cylinder, an energy accumulator set and a reversing valve set composed of seven reversing valves and proportional valves. The four working modes are switched through the control valve set. Small-flow driving is achieved through a differential loop during no-load rising. When the load rises, the energy accumulator releases pressure oil and supplies the pressure oil to the rodless cavity; when the load descends, oil in the rodless cavity is recycled to the energy accumulator to store potential energy; and oil flows back to the oil tank for circulating cooling during no-load descending. The gravitational potential energy recycling device can recycle gravitational potential energy in the descending process of a mechanical load, when load equipment needs to ascend again, hydraulic pressure of the energy accumulator is released and used for supporting ascending of the load, and the hydraulic energy is converted into the gravitational potential energy again. In the process of switching the system from no-load rising to load rising, pressure impact caused by switching of the reversing valve is limited on the valve group and is not transmitted to an oil cylinder and equipment.

Description

TECHNICAL FIELD

[0001] The utility model belongs to hydraulic technology field relates to a kind of step beam potential energy recovery energy-saving hydraulic system. BACKGROUND

[0002] In metallurgical industry, especially in the mechanical equipment of furnace bottom of heating furnace and the equipment of steel coil conveying, the step beam mechanical equipment is often driven by hydraulic mode. The action frequency is high during the operation of these equipment, and the load is heavy, especially in the process of descending, the gravitational potential energy is converted into the heat of hydraulic oil, not only the gravitational potential energy is wasted, but also the cooling load of hydraulic system is increased.

[0003] The existing potential energy recovery energy-saving hydraulic system mainly has the following two problems:

[0004] 1, the oil communication between potential energy recovery accumulator and rodless cavity of oil cylinder is frequently switched, and speed control oil inlet throttling and oil return throttling are alternately performed, which can easily cause large system pressure impact;

[0005] 2, hydraulic oil repeatedly flows in rodless cavity of oil cylinder and potential energy recovery accumulator, and the heat of hydraulic oil is not exchanged, so that the contaminated and aged hydraulic oil cannot be timely returned to oil tank for circulation filtering and cooling. TECHNICAL SOLUTION

[0006] Therefore, the utility model aims to provide a kind of step beam potential energy recovery hydraulic system, which has simple structure, small pressure impact, and can consider potential energy recovery mode and conventional mode.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0008] A kind of step beam potential energy recovery energy-saving hydraulic system, including control system, hydraulic pump, oil cylinder, accumulator group, reversing valve group;The reversing valve group is connected with control system and is controlled by control system, and the potential energy of accumulator group is recycled by switching hydraulic circuit to realize step beam;

[0009] The reversing valve group includes first reversing valve, second reversing valve, third reversing valve, fourth reversing valve, fifth reversing valve, sixth reversing valve, seventh reversing valve and proportional valve;

[0010] The inlet of the hydraulic pump is connected with the oil tank, and the outlet of the hydraulic pump is connected with one end of the fifth reversing valve, and the other end of the fifth reversing valve is divided into three ways: one end of the fourth reversing valve is connected with the first way, one end of the sixth reversing valve is connected with the second way, and one end of the proportional valve is connected with the third way;The other end of the sixth reversing valve is connected with the seventh reversing valve after converging, and the other end of the seventh reversing valve is connected with the rodless cavity of the oil cylinder;One end of the proportional valve is connected with one end of the second reversing valve, and the other end of the second reversing valve is connected with the rod cavity of the oil cylinder;

[0011] The other end of the fourth reversing valve is divided into two paths, one of which is connected with one end of the third reversing valve, and the other of which is connected with the pipeline between the seventh reversing valve and the rodless chamber of the oil cylinder; the other end of the third reversing valve is connected with the pipeline between the second reversing valve and the proportional valve; the pipeline between the second reversing valve and the rod chamber of the oil cylinder is connected with one end of the first reversing valve, and the other end of the first reversing valve is connected with the oil tank.

[0012] Further, a pressure sensor is also connected with the inlet of the rodless chamber of the oil cylinder, and the pressure sensor is connected with the control system.

[0013] The working mode of the control system is as follows:

[0014] When the step beam is lifted in an empty state, the second reversing valve, the third reversing valve and the fifth reversing valve are opened, the first reversing valve, the fourth reversing valve, the sixth reversing valve and the seventh reversing valve are closed, the hydraulic oil pushes the oil cylinder to extend in a differential mode, and the extension speed of the oil cylinder is controlled by the proportional valve;

[0015] When the step beam is lifted with a load, the first reversing valve, the third reversing valve and the sixth reversing valve are opened, the second reversing valve, the fourth reversing valve, the fifth reversing valve and the seventh reversing valve are closed, the pressure oil stored in the accumulator is supplied to the rodless chamber of the oil cylinder at this time, the oil in the rod chamber of the oil cylinder is discharged back to the oil tank, and the lifting speed is adjusted by the proportional valve;

[0016] When the step beam is lowered with a load, the second reversing valve, the fifth reversing valve and the seventh reversing valve are opened, the first reversing valve, the third reversing valve, the fourth reversing valve and the sixth reversing valve are closed, the pressure oil of the oil pump is connected to the rod chamber of the oil cylinder at this time, and the pressure oil of the rodless chamber is recovered to the accumulator;

[0017] When the step beam is lowered in an empty state, the first reversing valve, the second reversing valve and the fourth reversing valve are opened, the third reversing valve, the fifth reversing valve, the sixth reversing valve and the seventh reversing valve are closed, the oil in the rodless chamber of the oil cylinder flows back to the oil tank by gravity at this time, and the rod chamber of the oil cylinder is supplemented.

[0018] The potential energy recovery of the step beam is realized by switching the opening and closing of the reversing valves of the valve group, in the empty state lifting stage, the load is small, the differential circuit is adopted to realize the small flow empty state lifting, in the load lifting stage, the accumulator releases the flow for the equipment load lifting, in the load descending stage, the gravitational potential energy is recovered to the accumulator, and in the empty state descending process, the total mass is small, the recoverable energy is small, the gravity descending is adopted in this stage, and the oil in the rodless chamber of the oil cylinder is returned to the oil tank.

[0019] When the potential energy recovery accumulator group needs to be overhauled and fails, the sixth reversing valve and the seventh reversing valve are closed, and the system can work normally in the non-potential energy recovery mode.

[0020] The utility model discloses the beneficial effect lies in:

[0021] 1、The utility model discloses a step -by -step beam load can recover most of the gravitational potential energy when descending, and releases in the load ascending process;In the no -load descending and no -load ascending process, the exchange of the oil liquid of the rodless cavity and the rod cavity of the oil cylinder and the oil liquid of the oil tank is realized, and the heat of the oil liquid in the oil cylinder can be brought back to the oil tank in this exchange process.

[0022] 2、The utility model discloses when the rodless cavity of oil cylinder and the energy recovery accumulator group are connected, the flow control of proportional valve is always throttling for oil inlet, and the pressure impact produced by the back and forth switching of oil return throttling and oil inlet throttling is avoided.

[0023] 3、The utility model discloses be convenient for the reform of the step -by -step beam hydraulic system on the market.

[0024] The other advantages, objects and features of the utility model will be set forth in the subsequent specification to some extent, and to some extent, will be obvious to those skilled in the art based on the study of the following, or can be taught from the practice of the utility model. The objects and other advantages of the utility model can be realized and obtained by the following specification. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to make the purpose, technical scheme and advantage of the utility model more clear, the preferred detailed description of the utility model will be combined with the drawings below, wherein:

[0026] Figure 1 It is the principle diagram of step -by -step beam energy -recovery energy -saving hydraulic system in the utility model.

[0027] Figure 2 It is the state diagram of step -by -step beam no -load ascending process in the utility model.

[0028] Figure 3 It is the state diagram of step -by -step beam load ascending process in the utility model.

[0029] Figure 4 It is the state diagram of step -by -step beam load descending process in the utility model.

[0030] Figure 5 It is the state diagram of step -by -step beam no -load descending process in the utility model.

[0031] Figure 6 It is the state diagram of step -by -step beam load ascending process in the utility model under accumulator overhaul mode.

[0032] Reference signs: 1 - first directional control valve; 2 - second directional control valve; 3 - third directional control valve; 4 - fourth directional control valve; 5 - fifth directional control valve; 6 - sixth directional control valve; 7 - seventh directional control valve; 8 - proportional valve; 9 - hydraulic pump; 10 - accumulator group; 11 - oil cylinder. DETAILED DESCRIPTION

[0033] The other advantages and effects of the present application can be easily understood by those skilled in the art from the disclosure of the present application. The present application can also be implemented or applied in other different specific embodiments, and various modifications or changes can be made to the details in the specification without departing from the spirit of the present application. It should be noted that the drawings provided in the following embodiments only illustrate the basic concept of the present application in a schematic manner, and the features in the following embodiments and examples can be combined with each other without conflict.

[0034] It should be noted that the drawings are only used for illustrative explanation, and the representation is only a schematic diagram, not a physical diagram, and should not be understood as a limitation of the present application; in order to better illustrate the embodiments of the present application, some components in the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some known structures and their descriptions in the drawings may be omitted.

[0035] The same or similar reference signs in the drawings of the embodiments of the present application correspond to the same or similar components; in the description of the present application, it should be understood that if the terms "upper", "lower", "left", "right", "front", "back" and the like indicate the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, therefore the terms describing the positional relationship in the drawings are only used for illustrative explanation, and should not be understood as a limitation of the present application, for those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0036] Please refer to Figures 1-6 It is a kind of step beam potential energy recovery energy-saving hydraulic system, including control system, hydraulic pump 9, oil cylinder 11, accumulator group 10, directional control valve group;Directional control valve group is connected with control system, and is controlled by control system, and the potential energy of accumulator group 10 is recovered by switching hydraulic circuit to realize step beam;

[0037] Directional control valve group includes first directional control valve 1, second directional control valve 2, third directional control valve 3, fourth directional control valve 4, fifth directional control valve 5, sixth directional control valve 6, seventh directional control valve 7, proportional valve 8;

[0038] The inlet of hydraulic pump 9 is connected to the oil tank, and the outlet of hydraulic pump 9 is connected to one end of the fifth directional valve 5. The other end of the fifth directional valve 5 is divided into three paths: the first path is connected to one end of the fourth directional valve 4, the second path is connected to one end of the sixth directional valve 6, and the third path is connected to one end of the proportional valve 8. The other end of the sixth directional valve 6 is connected to the accumulator group 10 after merging with one end of the seventh directional valve 7. The other end of the seventh directional valve 7 is connected to the rodless chamber of the cylinder. The other end of the proportional valve 8 is connected to one end of the second directional valve 2, and the other end of the second directional valve 2 is connected to the rod chamber of the cylinder.

[0039] The other end of the fourth directional valve 4 is divided into two paths: one path connects to one end of the third directional valve 3, and the other path connects to the pipeline between the seventh directional valve 7 and the rodless chamber of the cylinder; the other end of the third directional valve 3 connects to the pipeline between the second directional valve 2 and the proportional valve 8; the pipeline between the second directional valve 2 and the rod chamber of the cylinder connects to one end of the first directional valve 1, and the other end of the first directional valve 1 connects to the oil tank.

[0040] Furthermore, a pressure sensor is connected to the inlet of the rodless chamber of the hydraulic cylinder, and the pressure sensor is connected to the control system.

[0041] In the walking beam potential energy recovery mode, the control system operates as follows:

[0042] As attached Figure 2 As shown, when the walking beam rises under no-load conditions and the walking beam frame has not yet contacted the load, the second reversing valve 2, the third reversing valve 3, and the fifth reversing valve 5 open, and the first reversing valve 1, the fourth reversing valve 4, the sixth reversing valve 6, and the seventh reversing valve 7 close. The hydraulic oil pushes the cylinder 11 to extend through differential means, and the extension speed of the cylinder 11 is controlled by the proportional valve 8.

[0043] As attached Figure 3 As shown, when the load on the walking beam rises, the first reversing valve 1, the third reversing valve 3, and the sixth reversing valve 6 open, while the second reversing valve 2, the fourth reversing valve 4, the fifth reversing valve 5, and the seventh reversing valve 7 close. At this time, the pressure oil stored in the accumulator is supplied to the rodless chamber of the cylinder, and the oil in the rod chamber of the cylinder is discharged back to the oil tank. The rising speed is adjusted by the proportional valve 8.

[0044] As attached Figure 4 As shown, when the load on the walking beam decreases, the second reversing valve 2, the fifth reversing valve 5, and the seventh reversing valve 7 open, while the first reversing valve 1, the third reversing valve 3, the fourth reversing valve 4, and the sixth reversing valve 6 close. At this time, the oil pump pressure oil is connected to the rod chamber of the oil cylinder, and the rodless chamber pressure oil is recovered into the accumulator.

[0045] As attached Figure 5As shown, when the walking beam is lowered under no load, the first reversing valve 1, the second reversing valve 2 and the fourth reversing valve 4 are opened, and the third reversing valve 3, the fifth reversing valve 5, the sixth reversing valve 6 and the seventh reversing valve 7 are closed, at this time, the oil in the rodless cavity of the oil cylinder flows back to the oil tank by gravity, and the oil in the rod cavity of the oil cylinder is supplemented.

[0046] The potential energy recovery of the walking beam is realized by switching the opening and closing of the reversing valves in the valve group, in the no-load rising stage, the load is small, the differential circuit is used to realize the small flow no-load rising, in the load rising stage, the accumulator releases the flow for the equipment load rising, and in the load descending, the gravitational potential energy is recovered into the accumulator, in the no-load descending process, the total mass is small, the recoverable energy is small, and in this stage, the oil cylinder rodless cavity part of the oil is returned to the oil tank by gravity.

[0047] The working process of the walking beam in the non-potential energy recovery mode (accumulator group 10 maintenance mode) is as follows:

[0048] The control mode of the accumulator maintenance mode no-load rising and no-load descending is the same as that of the potential energy recovery mode.

[0049] The control mode of the accumulator maintenance mode load descending is the same as that of the no-load descending in the potential energy recovery mode.

[0050] As shown in the accompanying drawings, Figure 6 As shown, in the accumulator maintenance mode, when the walking beam is raised under load, the first reversing valve 1, the third reversing valve 3 and the fifth reversing valve 5 are opened, and the second reversing valve 2, the fourth reversing valve 4, the sixth reversing valve 6 and the seventh reversing valve 7 are closed, at this time, the pressure oil provided by the hydraulic pump 9 is supplied to the rodless cavity of the oil cylinder, and the oil in the rod cavity of the oil cylinder is returned to the tank.

[0051] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present application and are not limited, although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced equivalently without departing from the purpose and scope of the present application, and all should be covered in the scope of the claims of the present application.

Claims

1. A step-beam potential energy recovery energy-saving hydraulic system, characterized in that: Including control system, hydraulic pump, oil cylinder, accumulator group, reversing valve group, the oil cylinder is connected step beam, the reversing valve group is connected with control system, and is controlled by control system, and the potential energy of accumulator group is recovered through switching hydraulic circuit to realize step beam; The reversing valve group includes first reversing valve, second reversing valve, third reversing valve, fourth reversing valve, fifth reversing valve, sixth reversing valve, seventh reversing valve and proportional valve. The inlet of the hydraulic pump is connected with the oil tank, and the outlet of the hydraulic pump is connected with one end of the fifth reversing valve, and the other end of the fifth reversing valve is divided into three ways: the first way is connected with one end of the fourth reversing valve, the second way is connected with one end of the sixth reversing valve, and the third way is connected with one end of the proportional valve; the other end of the sixth reversing valve is connected with the seventh reversing valve after being merged, and the other end of the seventh reversing valve is connected with the rodless cavity of the oil cylinder; the other end of the proportional valve is connected with one end of the second reversing valve, and the other end of the second reversing valve is connected with the rod cavity of the oil cylinder; The other end of the fourth reversing valve is divided into two ways: one way is connected with one end of the third reversing valve, and the other way is connected with the pipeline between the seventh reversing valve and the rodless cavity of the oil cylinder; the other end of the third reversing valve is connected with the pipeline between the second reversing valve and the proportional valve; the pipeline between the second reversing valve and the rod cavity of the oil cylinder is connected with one end of the first reversing valve, and the other end of the first reversing valve is connected with the oil tank.

2. The step-lever potential energy recovery energy-saving hydraulic system according to claim 1, characterized in that: The inlet of the rodless cavity of the oil cylinder is also connected with a pressure sensor, and the pressure sensor is connected with the control system.

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