A new type of energy-saving hydraulic control system for walking beam furnace

Abstract

The utility model discloses a novel step -by -step heating furnace energy -saving hydraulic control system relates to hydraulic control technical field, this hydraulic control system includes pressure oil source, lift oil cylinder, check valve, electromagnetic ball valve, pressure compensator, proportional reversing valve and energy storage tank, wherein check valve is used to supplement oil liquid from the return oil line to the chamber of lift oil cylinder, pressure compensator is used for stabilizing the pressure difference before and after proportional reversing valve, proportional reversing valve is used for adjusting oil liquid oil -in order and adjusting output oil liquid flow, the hydraulic control system provided by the utility model can reduce the use of low -pressure accumulator, reduce the input cost, improve the recovery period and reach better energy -conserving effect through differential principle before lift oil cylinder contacts load, while realizing that lift oil cylinder realizes quick movement.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic control technology, specifically a novel energy-saving hydraulic control system for a stepping furnace. Background Technology

[0002] A walking beam furnace is a continuous heating furnace that moves the billet forward step by step by the rising, advancing, lowering, and retracting motion of the furnace bottom or water-cooled metal beams. It is a type of continuous heating furnace, named for the specialized walking mechanism that moves the steel billet along a specific trajectory (usually rectangular). A slant-rail walking beam furnace mainly consists of a walking beam, lifting slant rails, a fixed beam, and a hydraulic drive mechanism for the walking beam. The movement of the billet within the furnace is achieved through the rising, advancing, lowering, and retracting of the walking beam. The rising and lowering of the walking beam is driven by lifting hydraulic cylinders, while the advancing and retracting are driven by translation hydraulic cylinders.

[0003] Traditional energy-saving technologies in the field of inclined rail walking beam furnaces all achieve energy saving by adding a hydraulic balancing device to recover the gravitational potential energy during the descent of the walking beam and reuse it during the lifting process. Currently commonly used energy-saving technologies include: (1) The hydraulic balancing device mainly consists of a single-acting balancing hydraulic cylinder, a replenishing oil device, and a single-pressure accumulator device. It can only balance about 30% of the weight of the walking beam, resulting in low energy-saving efficiency. In addition, the increased variety and number of hydraulic cylinders lead to an increase in the variety and cost of spare parts. (2) The hydraulic balancing device mainly consists of an energy recovery hydraulic cylinder, a replenishing oil device, and an accumulator device. It can balance about 64% of the weight of the walking beam and the total load, respectively, resulting in slightly higher energy-saving efficiency. However, it still has high power consumption, reduces the service life of the device, and increases the investment cost. Utility Model Content

[0004] This invention overcomes the shortcomings of the prior art and provides an energy-saving hydraulic control system for a walking beam furnace. Before the lifting cylinder contacts the load, the system uses the differential principle to achieve rapid movement of the lifting cylinder while reducing the use of low-pressure accumulators and reducing investment costs. The system also efficiently recovers and utilizes the gravitational potential energy of the walking beam in the furnace through a circuit, thereby improving the recovery cycle and achieving high energy efficiency.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A novel energy-saving hydraulic control system for a walking beam furnace includes: The power source, including the oil tank and pump unit, provides pressurized oil to the system; The lifting cylinder has three chambers: chamber A, chamber B, and chamber C, with the area of ​​chamber C being much larger than that of chambers A and B. One-way valve 1 is used to replenish oil to chamber C of the lifting cylinder from the return oil line; The electromagnetic ball valve includes electromagnetic ball valve one and electromagnetic ball valve two. When electromagnetic ball valve one is energized, it connects chamber A and chamber C. When electromagnetic ball valve two is energized, it connects the energy storage tank and chamber C. Pressure compensators are used to stabilize the pressure difference across a proportional directional valve. A proportional directional valve is used to regulate the oil inlet sequence and adjust the output oil flow rate. One-way valve two is used to replenish oil to chamber B from the return oil line; An energy storage tank stores the gravitational potential energy generated when the lifting cylinder retracts.

[0006] Preferably, the hydraulic control system further includes: A balancing valve regulates the pressure and flow rate of fluid by changing the position of the valve core.

[0007] Preferably, it also includes a second electromagnetic directional valve, which controls the opening and closing of the logic valve by gaining or losing power.

[0008] Preferably, it also includes an overflow valve for setting the maximum working pressure of chamber B.

[0009] The beneficial effects of this utility model are as follows: (1) The hydraulic control system provided by this utility model can reduce the use of low-pressure accumulators, reduce investment costs, and improve the recovery cycle by using the differential principle before the lifting cylinder contacts the load. This achieves better energy saving effect.

[0010] (2) The system is equipped with a one-way valve. When the energy storage tank is in the energy-saving mode and the electromagnetic ball valve J-DT1 cannot be opened, oil can be replenished to the C chamber through the return oil line to avoid damage to the oil cylinder or safety accidents caused by the oil cylinder sucking in air.

[0011] (3) In the case of all electrical control failures and the need to loosen the overflow valve on the cylinder valve group to lower the lifting cylinder, the one-way valve 2 in the system can replenish oil to chamber B through the return oil line, so as to avoid damage to the cylinder or cause safety accidents due to the cylinder sucking in air. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the hydraulic control system of this utility model; Figure 2 for Figure 1 A partially enlarged schematic diagram.

[0013] In the diagram: 1. Ball valve; 2. Check valve one; 3.1. Solenoid ball valve one; 4. Solenoid directional valve one; 5. Pressure compensator; 6. Proportional directional valve; 7. Balance valve; 8. Solenoid directional valve two; 9. Hydraulic check valve; 10. Logic valve; 11. Relief valve; 12. Check valve two; 13. Cylinder port valve assembly; 14. Energy storage tank. Detailed Implementation

[0014] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0015] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The embodiments cannot be described in detail here, but the embodiments of the present invention are not limited to the following embodiments.

[0016] Example: A novel energy-saving hydraulic control system for a walking beam furnace, with a structure as described above. Figure 1 and Figure 2 As shown, it includes: The power source, including the oil tank and pump unit, provides pressurized oil to the system. This power source is a common component of the hydraulic control system. Its specific structure and working principle are existing technologies and will not be described in detail here.

[0017] The lifting cylinder has three chambers: chamber A, chamber B, and chamber C. Chambers A and B have smaller areas, while chamber C has a much larger area than chambers A and B. Chambers A and B are connected to control valves A and B, respectively, to achieve the function of controlling the lifting and lowering of the conventional two chambers of the cylinder. Chamber C is connected to the energy storage tank 14, and the load is balanced by the pressure oil in the energy storage tank 14.

[0018] Ball valve 1, used during maintenance to prevent oil leakage during maintenance. When the one-way valve 2 is in mode 1 and J-DT1 cannot be opened, it can replenish oil to chamber C through the return oil line to avoid damage to the cylinder or safety accidents caused by the cylinder sucking in air.

[0019] When the solenoid ball valve 3.1 is energized, it connects chamber A and chamber C, serving both a differential function and a function of switching between energy-saving and non-energy-saving modes. When the solenoid ball valve 3.2 is energized, the oil in the energy storage tank connects to chamber C of the oil tank.

[0020] When the solenoid directional valve 4 is energized, it opens the hydraulic control check valve on the cylinder valve assembly 13.

[0021] Pressure compensator 5 stabilizes the pressure difference across the proportional valve, thus ensuring a more stable output flow rate of the proportional valve under different loads.

[0022] The proportional directional valve 6 regulates the oil inlet sequence and adjusts the output oil flow rate by adjusting the proportional valve opening signal, thus achieving a gentle handling condition.

[0023] The balancing valve 7 regulates fluid pressure and flow rate by changing the position of the valve core. When the system pressure or flow rate changes, the valve core moves according to preset conditions, thereby adjusting the opening of the flow channel. This prevents the walking beam from stalling due to load changes during descent.

[0024] The electromagnetic directional valve 28 achieves differential function by controlling its gain and loss of power.

[0025] The hydraulic control check valve 9 achieves differential function by controlling the opening and closing of the hydraulic control check valve 9 through the energization and de-energization of the solenoid directional valve 8.

[0026] The logic valve 10 achieves differential function by controlling the opening and closing of the logic valve 10 through the energization and de-energization of the solenoid directional valve 28.

[0027] The overflow valve 11 is used to set the maximum working pressure of chamber B and serves as a safety protection function.

[0028] One-way valve 12 can replenish oil to chamber B through the return oil line when all electronic controls fail and the overflow valve on cylinder valve group 13 needs to be released to lower the lifting cylinder, thus preventing damage to the cylinder or safety accidents caused by cylinder sucking in air.

[0029] The cylinder valve assembly 13 includes a hydraulically controlled check valve and a relief valve. The hydraulically controlled check valve is used to maintain pressure and prevent the cylinder from sliding down. The relief valve is used for safety protection.

[0030] The energy storage tank 14 outputs oil when the oil cylinder rises and recovers and stores the gravitational potential energy when the oil cylinder retracts, so that it can be used for the next rise.

[0031] The hydraulic circuit is driven by a hydraulic control system to lift the stepping beam by lifting the cylinder. There are two working modes: Mode 1: energy-saving mode in which the energy storage tank participates in the work; and Mode 2: non-energy-saving mode in which the energy storage tank does not participate in the work.

[0032] Mode 1: Energy-saving mode involving energy storage tanks, the specific working principle of which is as follows: When the lifting action is achieved, before the lifting cylinder contacts the load (below the equal height position), the P port of the proportional directional valve 6 is connected to the A port, and the B port is connected to the T port. Simultaneously, J-DT2 of solenoid ball valve 3.1 is energized, connecting chambers A and C of the lifting cylinder. Hydraulic oil sequentially flows through pressure compensator 5, proportional directional valve 6, balance valve 7, and solenoid ball valve 3.1 into chambers A and C of the lifting cylinder. The P port of solenoid directional valve 8 is connected to the B port, and the A port is connected to the T port, opening logic valve 10 and closing hydraulic check valve 9. This utilizes the differential principle to achieve rapid extension and lifting of the lifting cylinder. After the lifting cylinder contacts the load (above the equal height position), the P port of the proportional directional valve 6 is connected to the A port, and the B port is connected to the T port. Simultaneously, J-DT2 of solenoid ball valve 3.1 is de-energized. Hydraulic oil sequentially passes through pressure compensator 5, proportional directional valve 6, and balance valve 7 before entering chamber A of the lifting cylinder. The P port of solenoid directional valve 8 is connected to port A, and its B port is connected to port T. This closes logic valve 10 and opens hydraulic check valve 9, allowing oil in chamber B to return to the return line. Simultaneously, solenoid ball 3.2's J-DT1 is energized, connecting chamber C to energy storage tank 14. Pressure oil from energy storage tank 14 then enters chamber C of the lifting cylinder. Under the pressure of the oil in chambers A and C, the lifting cylinder pushes the load upwards.

[0033] When the descent is achieved, and the lifting cylinder contacts the load (above the same height), the P port of the proportional directional valve 6 connects to the B port, and the A port connects to the T port. Hydraulic oil flows sequentially through the pressure compensator 5 and the proportional directional valve 6 into the B chamber of the cylinder. Oil from the A chamber of the cylinder flows sequentially through the balance valve 7 and the proportional directional valve 6 back to the return line. Simultaneously, the J-DT1 of the solenoid ball valve 3.2 is energized, connecting the C chamber to the energy storage tank 14. Under the combined action of the B chamber and the load, the lifting cylinder pushes the piston downwards, and the oil released during the upward phase of the C chamber is forced back into the energy storage tank 14. In other words, during the descent, gravitational potential energy is converted into hydraulic energy and stored again, ready to be released and utilized during the next ascent. As the descent continues, when the lifting cylinder is unloaded (below the same height), the P port of the proportional directional valve 6 connects to the B port, and the A port connects to the T port. At the same time, the J-DT1 of the solenoid ball valve 3.2 is de-energized, and the hydraulic oil enters the B chamber of the cylinder through the pressure compensator 5 and the proportional directional valve 6. Meanwhile, the J-DT2 of the solenoid ball valve 3.1 is energized, connecting the A and C chambers of the lifting cylinder. The oil in the A and C chambers returns to the return oil line through the balance valve 7 and the proportional directional valve 6.

[0034] Mode 2: Non-energy-saving mode where the energy storage tank does not participate in operation. Its specific working principle is as follows: When the lifting action is achieved, the P port of the proportional directional valve 6 is connected to the A port, and the B port is connected to the T port. Simultaneously, the J-DT2 of the solenoid ball valve 3.1 is energized, connecting chambers A and C of the lifting cylinder. Hydraulic oil flows sequentially through the pressure compensator 5, the proportional directional valve 6, the balance valve 7, and the solenoid ball valve 3.1 into chambers A and C of the cylinder. The P port of the solenoid directional valve 8 is connected to the A port, and the B port is connected to the T port, closing the logic valve 10 and opening the hydraulic check valve 9, allowing the oil in chamber B to return to the return line. At this time, chambers A and C of the lifting cylinder are simultaneously supplied with oil by the proportional directional valve 6, and the energy storage tank 14 does not participate in the operation. The lifting cylinder pushes the load upward under the pressure of the oil in chambers A and C. When the lowering action is achieved, the P port of the proportional directional valve 6 is connected to the B port, and the A port is connected to the T port. Hydraulic oil flows sequentially through the pressure compensator 5 and the electro-hydraulic proportional directional valve 6 into chamber B of the cylinder. At the same time, the J-DT2 of the solenoid ball valve 3.1 is energized, connecting chambers A and C of the lifting cylinder; the oil in chambers A and C of the cylinder passes through the balance valve 7 and the proportional directional valve 6 in sequence and returns to the return oil line; under the combined action of chamber B and the load, the lifting cylinder pushes the piston downward.

[0035] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A novel energy-saving hydraulic control system for a walking beam furnace, characterized in that, include: The power source, including the oil tank and pump unit, provides pressurized oil to the system; The lifting cylinder has three chambers: chamber A, chamber B, and chamber C, with the area of ​​chamber C being much larger than that of chambers A and B. One-way valve (2) is used to replenish oil to chamber C of lifting cylinder from the return oil line; The electromagnetic ball valve includes electromagnetic ball valve one (3.1) and electromagnetic ball valve two (3.2). When electromagnetic ball valve one (3.1) is energized, it connects cavity A and cavity C. When electromagnetic ball valve two (3.2) is energized, it connects the energy storage tank and cavity C. Pressure compensator (5) is used to stabilize the pressure difference across the proportional directional valve (6); A proportional directional valve (6) is used to adjust the oil inlet sequence and the output oil flow rate. One-way valve 2 (12) is used to replenish oil to chamber B from the return oil line; Energy storage tank (14) stores the gravitational potential energy generated when the lifting cylinder retracts.

2. The novel energy-saving hydraulic control system for a walking beam furnace according to claim 1, characterized in that, The hydraulic control system also includes: The balancing valve (7) adjusts the pressure and flow rate of the fluid by changing the position of the valve core.

3. The novel energy-saving hydraulic control system for a walking beam furnace according to claim 1, characterized in that, The hydraulic control system also includes: The electromagnetic reversing valve 2 (8) controls the opening and closing of the logic valve (10) by gaining and losing power.

4. The novel energy-saving hydraulic control system for a walking beam furnace according to claim 1, characterized in that, The hydraulic control system also includes: The overflow valve (11) is used to set the maximum working pressure of chamber B.

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