Hydraulic energy-saving device for the lifting circuit of a heating furnace

Abstract

The present invention discloses a hydraulic energy-saving device for the lifting circuit of a heating furnace. The beneficial effects of the present invention are as follows: the gravitational potential energy of the load is recovered by a plunger accumulator and reused, and the energy-saving effect is very obvious. Since the general design of the oil cylinder in a heating furnace system is that the rodless cavity is filled with oil for rising and the rod cavity is filled with oil for falling, the power system only needs to provide flow and pressure for the oil cylinder when it is falling. Since the area of the rod cavity of the oil cylinder is small, the required flow is relatively small, which greatly reduces the power configuration of the system, can reduce the capacity design of the system, and achieves a good energy-saving effect. In addition, by setting up an electric control device, it is possible to monitor the air pressure, oil pressure of the plunger accumulator and the working conditions of the oil cylinder in real time, and realize functions such as automatic refueling, oil replenishment, air pressure monitoring and alarm.

Description

Technical Field

[0001] The present invention relates to the technical field of xx, in particular to a hydraulic energy-saving device for a lifting circuit of a heating furnace. Background Art

[0002] In the traditional walking beam reheating furnace during operation, the system flow rate of the lifting action varies from 520 to 1600 L / min, and it is required to select 3 - 8 oil pumps with a flow rate of 200 L / min in the design and use of the hydraulic system. Since the general load of the heating furnace steel beam, water tank, billet, etc. is about 600 t, and the inclination angle of the lifting cylinder of the heating furnace is 13°, the working pressure of the system is 14 - 16 MPa. According to this power requirement, generally four motors with a power of 75 KW are selected. In addition to the lifting action circuit, the heating furnace system also has circuits such as furnace door lifting and translation. The loads and speed requirements of these circuits are not large, the cylinders are not large, the required flow rate is not large, and the pressure is not high, so the required power is not large. The high power configuration of the entire system is mainly caused by the requirements of the lifting circuit. In view of this, in-depth research on the above problems has led to the generation of this case. Summary of the Invention

[0003] The technical solution of the present invention to achieve the above object is: a hydraulic energy-saving device for a lifting circuit of a heating furnace, including: an oil cylinder, a plunger accumulator, a plurality of nitrogen gas cylinders, a first electromagnetic directional valve, a second electromagnetic directional valve, a third electromagnetic directional valve, a hydraulic motor, a servo motor, and a fixed bracket. The oil cylinder is installed on the fixed bracket through an angle adjustment structure, and the plurality of nitrogen gas cylinders and the plunger accumulator are installed on the fixed bracket through an auxiliary rotation adjustment structure. A drainage feeding pipe A and a drainage hydraulic pipe B are provided on the oil cylinder. The hydraulic motor A5 is connected to the drainage feeding pipe A. The oil outlet A2 of the second electromagnetic directional valve and the oil inlet end of the plunger accumulator are respectively connected and communicated through a pipeline or a valve block, and the oil inlet end of the plunger accumulator is also connected and communicated with the oil outlet A3 of the third electromagnetic directional valve. The rodless cavity port B of the oil cylinder is connected and communicated with the second oil outlet B1 of the first electromagnetic directional valve through a pipeline or a valve block. The gas inlet end of the plunger accumulator is connected and communicated with the nitrogen gas cylinder through a pipeline or a valve block. The pressure port P1 of the first electromagnetic directional valve is connected to the system pressure oil, and its oil return port T1 is connected to the low-pressure oil return port and returns to the oil tank. The pressure port P2 of the second electromagnetic directional valve is connected to the system pressure oil, and its oil outlet A2 is connected to the oil port A4 of the hydraulic motor. The pressure port P3 of the third electromagnetic directional valve is connected to the system low-pressure oil return port. The electronic control device controls the second electromagnetic directional valve and the third electromagnetic directional valve by obtaining the pressure parameters of the oil pressure and gas pressure of the plunger accumulator, ensuring that the plunger accumulator has a sufficient and reasonable power source, and at the same time sending out signals of normal air pressure and deviation.

[0004] It should be noted that, in the above, the electronic control device receives the nitrogen pressure and the pressure and piston stroke information of the plunger accumulator to analyze whether the oil storage of the plunger accumulator is insufficient. If insufficient, the electromagnet YA2 of the second electromagnetic reversing valve is controlled to be energized, and the pressure port P2 of the second electromagnetic reversing valve is connected to its oil outlet A3. The system replenishes the power oil to the plunger accumulator. When the setting value of the oil pressure end pressure sensor 7 is reached, the electromagnet YA2 of the third electromagnetic reversing valve is controlled to be de-energized, the second electromagnetic reversing valve is closed, and the oil replenishment is stopped. If there is too much oil in the plunger accumulator, the third electromagnetic reversing valve is controlled to be energized, and the oil outlet A3 of the third electromagnetic reversing valve is connected to the low-pressure oil return system of the system. The oil in the plunger accumulator is discharged through the third electromagnetic reversing valve. When it drops to the setting value of the oil pressure end pressure sensor, the electromagnet YA1 of the third electromagnetic reversing valve is controlled to be de-energized, the third electromagnetic reversing valve is closed, and the oil discharge is stopped. The nitrogen pressure is monitored by the pressure sensor at the air pressure end. If the nitrogen pressure is reduced by comparison, a nitrogen leakage signal is issued, and the nitrogen tank is replenished with nitrogen manually or by connecting an automatic charging device until the system requires it. One or more nitrogen tanks can be set. In this embodiment, two nitrogen tanks are set. In the initial stage, opening the second solenoid reversing valve can fill the connecting pipe between the plunger accumulator and the oil cylinder with pressurized oil. At the same time, the third solenoid reversing valve can be opened during maintenance to empty the oil inside; in the initial stage, nitrogen is injected into the nitrogen tank, and the nitrogen pressure needs to reach the set value. The oil cylinder is installed vertically or tilted, and the oil cylinder is at the lowest position. The second electromagnetic reversing valve is opened, and the system pressure oil injects pressurized oil into the plunger accumulator. At this time, the electronic control device detects the piston position of the plunger accumulator through the displacement sensor on the plunger accumulator to calculate the capacity of the plunger accumulator. In addition, the required capacity can be calculated according to the size and stroke of the oil cylinder actually used, and the position of the plunger accumulator is set according to the capacity. When the position value set by the plunger accumulator is reached, the second electromagnetic reversing valve is closed to complete the initial filling process. The electromagnet YA4 of the first electromagnetic reversing valve is energized, the first electromagnetic reversing valve is activated, the pressure port P1 of the first electromagnetic reversing valve is connected with its second oil outlet B1, the system pressure oil enters the rod chamber of the hydraulic cylinder through the port B of the rod chamber of the hydraulic cylinder, and at the same time, the servo motor drives the hydraulic motor to rotate and absorb the oil in the rodless chamber of the cylinder through the port A4 of the hydraulic motor and press it into the plunger accumulator. The cylinder descends under the joint action of the servo motor and the load, the electromagnet YA4 of the first electromagnetic reversing valve is powered off, the second oil outlet B1 of the first electromagnetic reversing valve is closed, and the electronic control system controls the servo motor to stop rotating, and the cylinder stops moving. When descending, the gravity potential energy of the load itself is balanced with the pressure energy in the plunger accumulator, and the servo motor drives the hydraulic motor to rotate so that the cylinder and the load generate the kinetic energy required for the descent, and the piston of the plunger rod is pushed to move, compress the nitrogen tank, and store the potential energy of the cylinder load. The oil inlet of the rod chamber of the cylinder only serves to supplement the oil and pressure loss, so the required pressure is not high and the required power is very low.The electromagnet YA3 of the first electromagnetic directional valve is energized, and the electromagnet YA3 of the first electromagnetic directional valve operates. The pressure port T1 of the first electromagnetic directional valve is communicated with its first oil outlet B1 and is connected to the oil tank through the low-pressure return oil pipe of the system. The electric control system controls the servo motor to drive the hydraulic motor to rotate. The pressure oil in the plunger accumulator enters the rodless cavity of the oil cylinder through the A5 port of the hydraulic motor to push the load to rise. When rising, the pressure energy in the plunger accumulator is balanced with the gravitational potential energy of the load itself. The servo motor only needs to drive the hydraulic motor to rotate to generate the kinetic energy required for the oil cylinder to rise. When the oil cylinder rises in place, the first electromagnetic directional valve is de-energized and stops operating. In this way, reciprocating lifting actions can be performed. Simply put, the nitrogen tank and the plunger accumulator form a spring to balance the load borne by the oil cylinder. When performing a downward movement, the servo motor drives the hydraulic motor to generate downward kinetic energy for the load. The plunger accumulator absorbs the oil and compresses the volume of nitrogen gas in the nitrogen cylinder, converting the gravitational potential energy of the oil cylinder load into pressure energy. When performing an upward movement, the servo motor drives the hydraulic motor to generate upward kinetic energy for the load, and the nitrogen cylinder releases the stored pressure energy to make the load rise. Theoretically, the pressure energy in the nitrogen cylinder is in a balanced valve state with the gravitational potential energy of the load, and the servo motor only needs to provide the kinetic energy required for the load to rise or fall.

[0005] Preferably, the angle adjustment structure includes: a pair of angle rotation shafts, a pair of concave arc slideways, a pair of convex arc sliders, a pair of arc limiting shafts, an L-shaped drainage limiting tube, an L-shaped drainage rotating tube, a rotating limiting disc, a pair of ring electromagnets, several inclined electromagnets, a pair of ring magnet blocks, several inclined magnets, and several sleeve buffer springs;

[0006] A pair of the angle rotation shafts are respectively inserted into the oil cylinder, and a pair of the angle rotation shafts are respectively inserted into the fixed bracket through bearings. A pair of the concave arc slide ways are installed relatively parallel to the fixed bracket. A pair of the convex arc sliders are respectively installed on both sides of the oil cylinder, and a pair of the convex arc sliders are respectively movably inserted into the inner sides of a pair of the concave arc slide ways. A pair of the arc limiting shafts are respectively inserted into the inner sides of a pair of the concave arc slide ways, and a pair of the arc limiting shafts are respectively movably inserted onto a pair of the convex arc sliders. The L-shaped rotation shaft tube is inserted into the oil cylinder. The L-shaped drainage limiting tube is connected to the servo motor A5, and the L-shaped drainage limiting tube is sleeved on the outer side of the L-shaped rotation shaft tube. The rotation limiting disc is sleeved on the L-shaped rotation shaft tube, and the rotation limiting disc is movably inserted into the inner side of the L-shaped drainage limiting tube. A pair of the ring electromagnets are respectively installed on the inner sides of a pair of the concave arc slide ways. A pair of the ring magnet blocks are respectively installed on a pair of the convex arc sliders. A plurality of the inclined electromagnets are uniformly inserted into the inner sides of a pair of the concave arc slide ways. A plurality of the inclined magnets are respectively installed on both sides of a pair of the convex arc sliders. A plurality of the sleeved buffer springs are respectively sleeved on a pair of the arc limiting shafts;

[0007] It should be noted that in the above, through the push of a pair of ring electromagnets, a pair of ring electromagnets respectively magnetically repel a pair of ring magnet blocks. A pair of ring magnet blocks respectively drive the convex arc sliders thereon, so that a pair of convex arc sliders respectively expand and contract along the inner sides of a pair of the concave arc slide ways. The convex arc sliders are limited by the ring limiting shafts on the inner sides of the concave arc slide ways, so that the oil cylinder rotates along a pair of angle rotation shafts, thereby achieving the angle adjustment of the oil cylinder according to different requirements. At the same time, the oil cylinder drives the L-shaped drainage rotation tube thereon to rotate, so that the L-shaped drainage rotation tube rotates along the inner side of the L-shaped drainage limiting tube. The L-shaped drainage rotation tube drives the rotation limiting disc thereon, so that the rotation limiting disc rotates along the inner side of the L-shaped drainage limiting tube, thereby achieving the angle adjustment of the oil cylinder according to different requirements, thereby achieving the rotation for drainage, avoiding the phenomenon of bending during the rotation process, and at the same time adjusting the drainage according to different rotation angles of the oil cylinder. At the same time, through the sequential energization of a plurality of inclined electromagnets, a plurality of inclined electromagnets respectively push the inclined magnets on the convex arc sliders one by one, thereby adjusting the position of the convex arc sliders on the inner sides of the concave arc slide ways. At the same time, a plurality of sleeved buffer springs elastically limit the convex arc sliders.

[0008] Preferably, the auxiliary rotation adjustment structure includes: a cylinder limit support block, two pairs of lifting hydraulic push rods, a lifting return block, a pair of toothed telescopic locking blocks, a plurality of telescopic locking shafts, a plurality of telescopic locking sleeve springs, a pair of adsorption electromagnets, a pair of adsorption magnets, a shunt cylinder valve, a pair of lifting limit discs, a pair of lifting limit tubes, and a pair of lifting drainage tubes;

[0009] A plurality of the nitrogen gas cylinders are evenly installed on the cylinder limit support block. The lifting return block is installed on both sides of the cylinder limit support block. A pair of lifting limit grooves are formed on the fixed bracket. Two pairs of the lifting hydraulic push rods are respectively installed inside a pair of the lifting limit grooves. The lifting return block is installed on the pushing ends of the two pairs of the lifting hydraulic push rods. A pair of toothed telescopic grooves are formed inside a pair of the lifting limit grooves. A pair of the toothed telescopic locking blocks are respectively movably inserted inside a pair of the toothed telescopic grooves. A plurality of the telescopic locking shafts are respectively evenly inserted inside a pair of the toothed telescopic grooves, and the plurality of the telescopic locking shafts are respectively movably inserted on a pair of the toothed telescopic locking blocks. A plurality of the telescopic locking sleeve springs are respectively sleeved on the plurality of the telescopic locking shafts. A pair of the adsorption electromagnets are respectively installed inside a pair of the toothed telescopic grooves. A pair of the adsorption magnets are respectively installed on a pair of the toothed telescopic locking blocks. The lifting drainage tube is connected to the plunger accumulator. The shunt cylinder valve is connected to a plurality of the nitrogen gas cylinders. A pair of the lifting limit tubes are respectively installed on the shunt cylinder valve and the oil cylinder, and a pair of the lifting limit tubes are movably sleeved on a pair of the lifting drainage tubes. The lifting drainage tube is connected to the first electromagnetic directional valve. The lifting limit disc is installed on the lifting drainage tube, and the lifting limit disc is movably inserted inside the lifting limit tube;

[0010] It should be noted that in the above, through the telescopic movement of two pairs of lifting hydraulic push rods inside a pair of lifting limit slots, the lifting hydraulic push rods drive the lifting loop-shaped blocks at their pushing ends to move up and down. The lifting loop-shaped blocks drive the cylinder limit support blocks thereon to move up and down. The cylinder limit support blocks drive a number of nitrogen tanks thereon to move up and down. By moving the lifting loop-shaped blocks to a certain height, a pair of adsorption electromagnets first magnetically adsorb a pair of adsorption magnets, so that a pair of tooth-shaped telescopic locking blocks respectively telescope along a number of telescopic locking shafts, squeezing and contracting the telescopic locking sleeve springs on the telescopic locking shafts, so as to extend the pair of tooth-shaped telescopic locking blocks into the inner side of the tooth-shaped telescopic slots. Then the lifting loop-shaped blocks are lifted to a certain height, and the current of the pair of adsorption electromagnets is cut off, so that the magnetism of the adsorbed adsorption magnets disappears. By squeezing the elastically deformed telescopic locking sleeve springs, the tooth-shaped telescopic locking blocks are inserted into the inner side of the lifting loop-shaped blocks, so as to limit the tooth-shaped insertion of the lifting loop-shaped blocks. The lifting drainage pipe telescopically moves along the inner side of the lifting limit pipe through the lifting limit disc, so as to achieve the telescopic limit of the drainage.

[0011] Preferably, a sealing structure is provided on the lifting limit pipe, the lifting drainage pipe, the L-shaped drainage limit pipe and the L-shaped drainage rotating pipe;

[0012] The sealing structure includes: a locking circular ring strip, a locking inner rack of the lifting circular ring, a number of locking limit shafts, a number of locking vertical sleeve springs, a circular ring locking lifting electromagnet, a circular ring locking magnet, a number of concave arc limit blocks, a number of locking horizontal telescopic shafts, a number of locking horizontal sleeve springs, a number of arc horizontal telescopic magnets and a pair of circular ring horizontal telescopic electromagnets;

[0013] The L-shaped drainage limiting tube is provided with a rotating circular ring groove, the rotating limiting disc is movably inserted inside the rotating circular ring groove, the locking circular ring clamping strip is installed on the rotating limiting disc, several locking limiting shafts are evenly inserted inside the rotating circular ring groove, the locking lifting circular ring internal rack is movably sleeved on several locking limiting shafts, the lifting limiting tube is provided with several arc telescopic grooves, several concave arc limiting blocks are respectively movably inserted inside several arc telescopic grooves, several locking horizontal telescopic shafts are respectively movably inserted inside several arc telescopic grooves, and several locking horizontal telescopic shafts are respectively movably inserted on several concave arc limiting blocks, several locking vertical sleeve springs are respectively sleeved on several locking limiting shafts, several locking horizontal telescopic shafts are respectively sleeved on several locking horizontal telescopic shafts, the circular ring locking magnet is installed on the locking lifting circular ring internal rack, the fixed locking lifting electromagnet is installed on the rotating circular ring groove, several arc horizontal telescopic magnets are respectively installed on several concave arc limiting blocks, and a pair of circular ring horizontal telescopic electromagnets are installed inside the lifting limiting tube;

[0014] It should be noted that in the above, by energizing the circular ring locking lifting electromagnet, the circular ring locking lifting electromagnet generates magnetism, repels the circular ring locking magnet through the magnetism, drives the locking lifting circular ring internal rack thereon through the circular ring locking magnet, and inserts the locking lifting circular ring internal rack into the inside of the locking circular ring clamping strip, so as to fix the locking circular ring clamping strip. At the same time, through the cooperation of the locking limiting shaft and the locking tooth mounting sleeve spring, the vertical limiting effect is achieved. Similarly, by energizing the circular ring horizontal telescopic electromagnet, several arc horizontal telescopic magnets respectively drive the concave arc limiting blocks thereon, and then the concave arc limiting blocks are sleeved on the lifting limiting disc, so as to achieve the effect of fixing the lifting limiting disc.

[0015] Preferably, an angle adjuster is provided on a pair of the convex arc sliders.

[0016] Preferably, the pressure sensor is installed between the pipeline of the plunger accumulator and the oil cylinder, and is used for detecting the oil pressure of the plunger accumulator and the oil pressure of the rodless cavity of the oil cylinder.

[0017] Preferably, the air pressure end pressure sensor is installed between the nitrogen tank and the plunger accumulator, and is used for detecting the air pressure of the nitrogen tank.

[0018] Preferably, pressure sensors are arranged inside several nitrogen tanks.

[0019] Preferably, ball grooves are respectively formed on a pair of the convex arc sliders, and moving balls are respectively arranged inside several ball grooves.

[0020] Preferably, a linear bearing is provided between the lifting limit tube and the lifting drainage tube.

[0021] Using the technical solution of the present invention to make a device, the gravitational potential energy of the load is recovered through a plunger accumulator and reused, and the energy-saving effect is very obvious. Since the general design of the oil cylinder in the heating furnace system is that the oil enters the rodless cavity to make the piston rise and the oil enters the rod cavity to make the piston fall, the power system only needs to provide flow and pressure when the oil cylinder descends. Since the area of the rod cavity of the oil cylinder is small, the required flow is relatively small, which greatly reduces the power configuration of the system, can reduce the capacity design of the system, and achieves a good energy-saving effect. In addition, by setting an electric control device, it is possible to monitor the air pressure, oil pressure of the plunger accumulator and the working conditions of the oil cylinder in real time, and realize functions such as automatic refueling, oil replenishment, air pressure monitoring and alarm. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 FIG. is a front view structural schematic diagram of the hydraulic energy-saving device for the lifting circuit of the heating furnace according to the present invention.

[0023] Figure 2 FIG. is a front view sectional schematic diagram of the hydraulic energy-saving device for the lifting circuit of the heating furnace according to the present invention.

[0024] Figure 3 FIG. is a top view structural schematic diagram of the hydraulic energy-saving device for the lifting circuit of the heating furnace according to the present invention.

[0025] Figure 4 is Figure 1 a partial enlarged view of "A" in FIG.

[0026] Figure 5 is Figure 2 a partial enlarged view of "B" in FIG.

[0027] Figure 6 is Figure 3 a partial enlarged view of "C" in FIG.

[0028] Figure 7 FIG. is an operation schematic diagram of the hydraulic energy-saving device for the lifting circuit of the heating furnace according to the present invention.

[0029] In the figure: 1. Oil cylinder; 2. Plunger accumulator; 3. Nitrogen tank; 4. First electromagnetic directional control valve; 5. Second electromagnetic directional control valve; 6. Third electromagnetic directional control valve; 7. Hydraulic motor; 8. Servo motor; 9. Fixed bracket; 10. Angle rotating shaft; 11. Concave arc slideway; 12. Convex arc slider; 13. Arc limit shaft; 14. L-shaped drainage limit pipe; 15. L-shaped drainage rotating pipe; 16. Rotating limit disc; 17. Ring electromagnet; 18. Tilt electromagnet; 19. Ring magnet block; 20. Tilt magnet; 21. Sleeve buffer spring; 22. Cylinder limit support block; 23. Lifting hydraulic push rod; 24. Lifting return block; 25. Tooth-shaped telescopic locking block; 26. Telescopic locking shaft; 27. Telescopic locking sleeve spring; 28. Adsorption electromagnet; 29. Adsorption magnet; 30. Lifting limit disc; 31. Lifting limit pipe; 32. Lifting drainage pipe; 33. Locking ring card strip; 34. Locking lifting ring internal rack; 35. Locking limit shaft; 36. Locking vertical sleeve spring; 37. Ring locking lifting electromagnet; 38. Ring locking magnet; 39. Concave arc limit block; 40. Locking horizontal telescopic shaft; 41. Locking horizontal sleeve spring; 42. Arc horizontal telescopic magnet; 43. Ring horizontal telescopic electromagnet. Detailed implementation mode

[0030] Persons in this field shall connect all the electrical components in this case to their adapted power supplies through wires, and should select a suitable controller according to the actual situation to meet the control requirements. For the specific connection and control sequence, reference should be made to the sequence of the electrical components working successively in the following working principle to complete the electrical connection. The detailed connection means are well-known technologies in this field. The following mainly introduces the working principle and process, and no description of electrical control will be made.

[0031] Embodiment

[0032] The following will specifically describe the present novelty with reference to the attached drawings, as Figures 1-7As shown in the figure, a hydraulic energy-saving device for a heating furnace lifting circuit includes: an oil cylinder 1, a plunger accumulator 2, several nitrogen gas cylinders 3, a first electromagnetic directional control valve 4, a second electromagnetic directional control valve 5, a third electromagnetic directional control valve 6, a hydraulic motor 7, a servo motor 8, and a fixed bracket 9. It is characterized in that the oil cylinder 1 is installed on the fixed bracket 9 through an angle adjustment structure, and several nitrogen gas cylinders 3 and the plunger accumulator 2 are installed on the fixed bracket 9 through an auxiliary rotation adjustment structure. A drainage feeding pipe A and a drainage hydraulic pipe B are provided on the oil cylinder 1. The hydraulic motor 7 is connected to the drainage feeding pipe A. The oil outlet A2 of the second electromagnetic directional control valve 5 and the oil inlet end of the plunger accumulator 2 are respectively connected and communicated through a pipeline or a valve block. And the oil inlet end of the plunger accumulator 2 is also connected and communicated with the oil outlet A3 of the third electromagnetic directional control valve 6. The rodless cavity port B of the oil cylinder 1 is connected and communicated with the second oil outlet B1 of the first electromagnetic directional control valve 4 through a pipeline or a valve block. The gas inlet end of the plunger accumulator 2 is connected and communicated with the nitrogen gas cylinder 3 through a pipeline or a valve block. The pressure port P1 of the first electromagnetic directional control valve 4 is communicated with the system pressure oil, and its oil return port T1 is communicated with the low-pressure oil return port and returns to the oil tank. The pressure port P2 of the second electromagnetic directional control valve 5 is communicated with the system pressure oil, and its oil outlet A2 is communicated with the oil port A4 of the hydraulic motor 7. The pressure port P3 of the third electromagnetic directional control valve 6 is communicated with the system low-pressure oil return port. The electronic control device controls the second electromagnetic directional control valve 5 and the third electromagnetic directional control valve 6 by obtaining the pressure parameters of the oil pressure and the gas pressure of the plunger accumulator 2 to ensure that the plunger accumulator 2 has a sufficient and reasonable power source, and at the same time issues a normal and deviation signal of the gas pressure. The angle adjustment structure includes: a pair of angle rotation shafts 10, a pair of concave arc slideways 11, a pair of convex arc sliders 12, a pair of arc limit shafts 13, an L-shaped drainage limit tube 14, an L-shaped drainage rotation tube 15, a rotation limit disc 16, a pair of ring electromagnets 17, several inclined electromagnets 18, a pair of ring magnet blocks 19, several inclined magnets 20, and several sets of buffer springs 21;A pair of the angle rotation shafts 10 are respectively inserted into the oil cylinder 1, and a pair of the angle rotation shafts 10 are respectively inserted into the fixed bracket 9 through bearings. A pair of the concave arc slideways 11 are installed relatively parallel to the fixed bracket 9. A pair of the convex arc sliders 12 are respectively installed on both sides of the oil cylinder 1, and a pair of the convex arc sliders 12 are respectively movably inserted into the inner sides of a pair of the concave arc slideways 11. A pair of the arc limiting shafts 13 are respectively inserted into the inner sides of a pair of the concave arc slideways 11, and a pair of the arc limiting shafts 13 are respectively movably inserted into a pair of the convex arc sliders 12. The L-shaped rotation shaft tube is inserted into the oil cylinder 1. The L-shaped drainage limiting tube 14 is connected to the servo motor 8A5, and the L-shaped drainage limiting tube 14 is sleeved on the outer side of the L-shaped rotation shaft tube. The rotation limiting disc 16 is sleeved on the L-shaped rotation shaft tube, and the rotation limiting disc 16 is movably inserted into the inner side of the L-shaped drainage limiting tube 14. A pair of the ring electromagnets 17 are respectively installed on the inner sides of a pair of the concave arc slideways 11. A pair of the ring magnet blocks 19 are respectively installed on a pair of the convex arc sliders 12. A plurality of the inclined electromagnets 18 are uniformly inserted into the inner sides of a pair of the concave arc slideways 11. A plurality of the inclined magnets 20 are respectively installed on both sides of a pair of the convex arc sliders 12. A plurality of the sleeve buffer springs 21 are respectively sleeved on a pair of the arc limiting shafts 13; The auxiliary rotation adjustment structure includes: a cylinder limiting support block 22, two pairs of lifting hydraulic push rods 23, a lifting return block 24, a pair of toothed telescopic locking blocks 25, a plurality of telescopic locking shafts 26, a plurality of telescopic locking sleeve springs 27, a pair of adsorption electromagnets 28, a pair of adsorption magnets 29, a shunt cylinder valve, a pair of lifting limiting discs 30, a pair of lifting limiting tubes 31 and a pair of lifting drainage tubes 32;A plurality of the nitrogen gas cylinders 3 are uniformly installed on the cylinder limit support block 22. The lifting loop-shaped block 24 is installed on both sides of the cylinder limit support block 22. A pair of lifting limit grooves are provided on the fixed bracket 9. Two pairs of the lifting hydraulic push rods 23 are respectively installed inside a pair of the lifting limit grooves. The lifting loop-shaped block 24 is installed on the pushing ends of the two pairs of the lifting hydraulic push rods 23. A pair of tooth-shaped telescopic grooves are provided inside a pair of the lifting limit grooves. A pair of tooth-shaped telescopic locking blocks 25 are respectively movably inserted inside a pair of the tooth-shaped telescopic grooves. A plurality of the telescopic locking shafts 26 are respectively uniformly inserted inside a pair of the tooth-shaped telescopic grooves, and a plurality of the telescopic locking shafts 26 are respectively movably inserted on a pair of the tooth-shaped telescopic locking blocks 25. A plurality of the telescopic locking sleeve springs 27 are respectively sleeved on a plurality of the telescopic locking shafts 26. A pair of the adsorption electromagnets 28 are respectively installed inside a pair of the tooth-shaped telescopic grooves. A pair of the adsorption magnets 29 are respectively installed on a pair of the tooth-shaped telescopic locking blocks 25. The lifting drain pipe 32 is connected to the plunger accumulator 2. The shunt cylinder valve is connected to a plurality of the nitrogen gas cylinders 3. A pair of the lifting limit pipes 31 are respectively installed on the shunt cylinder valve and the oil cylinder 1, and a pair of the lifting limit pipes 31 are movably sleeved on a pair of the lifting drain pipes 32. The lifting drain pipe 32 is connected to the first electromagnetic reversing valve 4. The lifting limit disc 30 is installed on the lifting drain pipe 32, and the lifting limit disc 30 is movably inserted inside the lifting limit pipe 31. A sealing structure is provided on the lifting limit pipe 31, the lifting drain pipe 32, the L-shaped drain limit pipe 14 and the L-shaped drain rotating pipe 15. The sealing structure includes: a locking ring strip 33, a locking lifting ring internal rack 34, a plurality of locking limit shafts 35, a plurality of locking vertical sleeve springs 36, a ring locking lifting electromagnet 37, a ring locking magnet 38, a plurality of concave arc limit blocks 39, a plurality of locking horizontal telescopic shafts 40, a plurality of locking horizontal sleeve springs 41, a plurality of arc horizontal telescopic magnets 42 and a pair of ring horizontal telescopic electromagnets 43;The L-shaped drainage limiting tube 14 is provided with a rotating circular ring groove, the rotating limiting disc 16 is movably inserted inside the rotating circular ring groove, the locking circular ring bar 33 is installed on the rotating limiting disc 16, several locking limiting shafts 35 are evenly inserted inside the rotating circular ring groove, the locking lifting circular ring internal rack 34 is movably sleeved on several locking limiting shafts 35, several arc telescopic grooves are provided on the lifting limiting tube 31, several concave arc limiting blocks 39 are respectively movably inserted inside several arc telescopic grooves, several locking horizontal telescopic shafts 40 are respectively movably inserted inside several arc telescopic grooves, and several locking horizontal telescopic shafts 40 are respectively movably inserted on several concave arc limiting blocks 39, several locking vertical sleeve springs 36 are respectively sleeved on several locking limiting shafts 35, several locking horizontal telescopic shafts 40 are respectively sleeved on several locking horizontal telescopic shafts 40, the circular ring locking magnet 38 is installed on the locking lifting circular ring internal rack 34, the fixed locking lifting electromagnet is installed on the rotating circular ring groove, several arc horizontal telescopic magnets 42 are respectively installed on several concave arc limiting blocks 39, a pair of circular ring horizontal telescopic electromagnets 43 are installed inside the lifting limiting tube 31; an angle adjuster is provided on a pair of convex arc sliders 12; the pressure sensor is installed between the pipelines of the plunger type accumulator 2 and the oil cylinder 1 for detecting the oil pressure of the plunger type accumulator 2 and the oil pressure of the rodless cavity of the oil cylinder 1; the air pressure end pressure sensor is installed between the nitrogen gas tank 3 and the plunger type accumulator 2 for detecting the air pressure of the nitrogen gas tank 3; pressure sensors are provided inside several nitrogen gas tanks 3; ball grooves are respectively provided on a pair of convex arc sliders 12, and moving balls are respectively provided inside several ball grooves; a linear bearing is provided between the lifting limiting tube 31 and the lifting drainage tube 32;

[0033] According to the attached Figures 1-7It is concluded that the electronic control device analyzes whether the oil storage in the plunger accumulator 2 is insufficient by receiving the nitrogen pressure, the pressure of the plunger accumulator 2, and the piston stroke information. If it is insufficient, it controls the electromagnet YA2 of the second electromagnetic reversing valve 5 to be energized. The pressure port P2 of the second electromagnetic reversing valve 5 communicates with its oil outlet A3, and the system replenishes the power oil to the plunger accumulator 2. When the set value of the oil pressure end pressure sensor 7 is reached, it controls the electromagnet YA2 of the third electromagnetic reversing valve 6 to be de-energized, closes the second electromagnetic reversing valve 5, and stops oil replenishment. If there is too much oil in the plunger accumulator 2, it controls the third electromagnetic reversing valve 6 to be energized. The oil outlet A3 of the third electromagnetic reversing valve 6 communicates with the low-pressure oil return system of the system, and the oil in the plunger accumulator 2 is drained through the third electromagnetic reversing valve 6. When it drops to the set value of the oil pressure end pressure sensor, it controls the electromagnet YA1 of the third electromagnetic reversing valve 6 to be de-energized, closes the third electromagnetic reversing valve 6, and stops oil drainage. The nitrogen pressure is monitored by the air pressure end pressure sensor. If it is found that the nitrogen pressure has decreased by comparison, a nitrogen leakage signal is sent, and nitrogen is replenished to the nitrogen tank 3 manually or by connecting an automatic inflation device until the system requirements are met. One or more nitrogen tanks 3 can be set. In this embodiment, two nitrogen tanks 3 are set. In the initial stage, opening the second electromagnetic reversing valve 5 can fill the connecting pipeline between the plunger accumulator 2 and the oil cylinder 1 with pressure oil. At the same time, when maintaining, the third electromagnetic reversing valve 6 can be opened to empty the oil inside; in the initial stage, nitrogen is injected into the nitrogen tank 3, and the nitrogen pressure needs to reach the set value. The oil cylinder 1 is installed vertically or inclined. When the oil cylinder 1 is at the lowest position, the second electromagnetic reversing valve 5 is opened, and the system pressure oil injects pressure oil into the plunger accumulator 2. At this time, the electronic control device detects the piston position of the plunger accumulator 2 through the displacement sensor on the plunger accumulator 2 to calculate the capacity of the plunger accumulator 2. In addition, the required capacity can be calculated according to the size and stroke of the actual used oil cylinder 1. The position of the plunger accumulator 2 is set according to the capacity. When the set position value of the plunger accumulator 2 is reached, the second electromagnetic reversing valve 5 is closed at this time to complete the initial liquid filling process. The electromagnet YA4 of the first electromagnetic reversing valve 4 is energized, the first electromagnetic reversing valve 4 acts, and the pressure port P1 of the first electromagnetic reversing valve 4 communicates with its second oil outlet B1. The system pressure oil enters the rod chamber of the oil cylinder 1 through the B port of the rod chamber of the hydraulic oil cylinder 1. At the same time, the servo motor 8 drives the hydraulic motor 7 to rotate to absorb the oil in the rodless chamber of the oil cylinder 1 and press it into the plunger accumulator through the A4 port of the hydraulic motor 7. The oil cylinder 1 descends under the combined action of the servo motor 8 and the load at the same time. The electromagnet YA4 of the first electromagnetic reversing valve 4 is de-energized, the second oil outlet B1 of the first electromagnetic reversing valve 4 is closed, and at the same time, the electronic control system controls the servo motor 8 to stop rotating, and the oil cylinder 1 stops acting. When descending, the gravitational potential energy of the load itself is balanced with the pressure energy in the plunger accumulator. The servo motor 8 drives the hydraulic motor 7 to rotate to generate the kinetic energy required for the oil cylinder 1 and the load to descend, and push the piston of the plunger rod to move, compressing the nitrogen tank 3,Store the potential energy of the load of the oil cylinder 1. The oil inlet of the rod chamber of the oil cylinder 1 only serves to supplement the oil and compensate for the pressure loss, so the required pressure is not high and the required power is very low. When the electromagnet YA3 of the first electromagnetic directional valve 4 is energized, the electromagnet YA3 of the first electromagnetic directional valve 4 acts, and the pressure port T1 of the first electromagnetic directional valve 4 is communicated with its first oil outlet B1, and is communicated with the low-pressure return oil pipe of the system to the fuel tank. The electric control system controls the servo motor 8 to drive the hydraulic motor 7 to rotate. The pressurized oil in the plunger accumulator enters the rodless chamber of the oil cylinder 1 through the A5 port of the hydraulic motor 7 to push the load to rise. When rising, the pressure energy in the plunger accumulator balances the gravitational potential energy of the load itself. The servo motor 8 drives the hydraulic motor 7 to rotate to generate the kinetic energy required for the oil cylinder 1 to rise. When the oil cylinder 1 rises in place, the first electromagnetic directional valve 4 is powered off and stops operating. In this way, reciprocating lifting actions can be performed. Simply put, the nitrogen gas cylinder 3 and the plunger accumulator 2 form a spring to balance the load borne by the oil cylinder 1. When performing a downward movement, the servo motor 8 drives the hydraulic motor 7 to generate downward kinetic energy for the load. The plunger accumulator absorbs the oil, compresses the volume of nitrogen gas in the nitrogen gas cylinder, and converts the gravitational potential energy of the load of the oil cylinder 1 into pressure energy. When performing an upward movement, the servo motor 8 drives the hydraulic motor 7 to generate upward kinetic energy for the load, and the nitrogen gas cylinder releases the stored pressure energy to make the load rise. Theoretically, the pressure energy in the nitrogen gas cylinder is in a balanced valve state with the gravitational potential energy of the load. The servo motor 8 only needs to provide the kinetic energy required for the load to rise or fall. Pushed by a pair of circular electromagnets 17, a pair of circular electromagnets 17 magnetically repel a pair of circular magnet blocks 19 respectively. A pair of convex arc sliders 12 are driven by a pair of circular magnet blocks 19 respectively, so that a pair of convex arc sliders 12 expand and contract along the inner sides of a pair of concave arc slideways 11 respectively. The convex arc sliders 12 are limited by the circular limiting shafts on the inner sides of the concave arc slideways 11, so that the oil cylinder 1 rotates along a pair of angular rotating shafts 10, thereby achieving angle adjustment of the oil cylinder 1 according to different requirements. At the same time, the L-shaped drainage rotating pipe 15 on the oil cylinder 1 is driven to rotate, so that the L-shaped drainage rotating pipe 15 rotates along the inner side of the L-shaped drainage limiting pipe 14. The rotating limiting disc 16 on the L-shaped drainage rotating pipe 15 is driven, so that the rotating limiting disc 16 rotates along the inner side of the L-shaped drainage limiting pipe 14, thereby achieving angle adjustment of the oil cylinder 1 according to different requirements, thereby achieving rotation for drainage and avoiding the phenomenon of bending during the rotation process. At the same time, the drainage is adjusted according to different rotation angles of the oil cylinder 1. At the same time, by sequentially energizing a plurality of inclined electromagnets 18, a plurality of inclined electromagnets 18 push the inclined magnets 20 on the convex arc sliders 12 one by one, thereby adjusting the position of the convex arc sliders 12 on the inner sides of the concave arc slideways 11. At the same time, a plurality of sets of buffer springs 21 elastically limit the convex arc sliders 12; by the telescopic movement of two pairs of lifting hydraulic push rods 23 inside a pair of lifting limit grooves,Drive two pairs of lifting hydraulic push rods 23 to push the lifting loop blocks 24 at the pushing ends to lift. Drive the cylinder limit support blocks 22 thereon to lift through the lifting loop blocks 24, drive several nitrogen tanks 3 thereon to lift through the cylinder limit support blocks 22. Move the lifting loop blocks 24 to a certain height, magnetically adsorb a pair of adsorption magnets 29 by a pair of adsorption electromagnets 28 first, so that a pair of tooth-shaped telescopic locking blocks 25 respectively telescope along several telescopic locking shafts 26, and squeeze and contract the telescopic locking sleeve springs 27 on the telescopic locking shafts 26, so as to reach the effect of telescoping a pair of tooth-shaped telescopic locking blocks 25 to the inside of the tooth-shaped telescopic groove. Then the lifting loop blocks 24 are lifted to a certain height, cut off the current of the pair of adsorption electromagnets 28, so that the magnetism of the adsorption magnets 29 disappears. By squeezing the elastically deformed telescopic locking sleeve springs 27, insert the tooth-shaped telescopic locking blocks 25 into the inside of the lifting loop blocks 24, so as to achieve tooth-shaped insertion and limit the lifting loop blocks 24. The lifting drainage pipe 32 telescopes along the inside of the lifting limit pipe 31 through the lifting limit disc 30, so as to achieve drainage and limit telescoping; By energizing the ring locking lifting electromagnet 37, the ring locking lifting electromagnet 37 generates magnetism. Repel the ring locking magnet 38 through the magnetism, drive the internal rack 34 of the locking lifting ring thereon by the ring locking magnet 38, and insert the internal rack 34 of the locking lifting ring into the inside of the locking ring clamping strip 33, so as to achieve the fixation of the locking ring clamping strip 33. At the same time, through the cooperation of the locking limit shaft 35 and the locking tooth-shaped sleeve spring, the effect of vertical limit is achieved. Similarly, by energizing the ring horizontal telescopic electromagnet 43, several arc horizontal telescopic magnets 42 respectively drive the concave arc limit blocks 39 thereon, and then the concave arc limit blocks 39 are sleeved on the lifting limit disc 30, so as to achieve the effect of fixing the lifting limit disc 30.,

[0034] The above technical solutions only reflect the preferred technical solutions of the technical solutions of the present invention. Some changes that those skilled in the art of this technology may make to some parts thereof all reflect the principles of the present invention and are within the protection scope of the present invention.

Claims

1. A hydraulic energy-saving device for a heating furnace lifting circuit, comprising: An oil cylinder, a plunger accumulator, several nitrogen gas cylinders, a first electromagnetic directional control valve, a second electromagnetic directional control valve, a third electromagnetic directional control valve, a hydraulic motor, a servo motor, and a fixing bracket, characterized in that the oil cylinder is mounted on the fixing bracket through an angle adjustment structure, several of the nitrogen gas cylinders and the plunger accumulator are mounted on the fixing bracket through an auxiliary rotation adjustment structure, a drainage feeding pipe A and a drainage hydraulic pipe B are provided on the oil cylinder, the hydraulic motor is connected to the drainage feeding pipe A, the oil outlet A2 of the second electromagnetic directional control valve and the oil inlet end of the plunger accumulator are respectively connected and communicated through a pipeline or a valve block, and the oil inlet end of the plunger accumulator is further connected and communicated with the oil outlet A3 of the third electromagnetic directional control valve. The rodless cavity port B of the oil cylinder is connected and communicated with the second oil outlet B1 of the first electromagnetic directional control valve through a pipeline or a valve block. The gas inlet end of the plunger accumulator is connected and communicated with the nitrogen gas cylinder through a pipeline or a valve block. The pressure port P1 of the first electromagnetic directional control valve is communicated with the system pressure oil, and its oil return port T1 is communicated with the low-pressure oil return port to return to the oil tank. The pressure port P2 of the second electromagnetic directional control valve is communicated with the system pressure oil, and its oil outlet A2 is communicated with the oil port A4 of the hydraulic motor. The pressure port P3 of the third electromagnetic directional control valve is communicated with the system low-pressure oil return port. The electronic control device controls the second electromagnetic directional control valve and the third electromagnetic directional control valve by obtaining the pressure parameters of the oil pressure and the gas pressure of the plunger accumulator; The angle adjustment structure includes: a pair of angle rotation shafts, a pair of concave arc slideways, a pair of convex arc sliders, a pair of arc limiting shafts, an L-shaped drainage limiting pipe, an L-shaped drainage rotating pipe, a rotation limiting disc, a pair of ring electromagnets, several inclined electromagnets, a pair of ring magnet blocks, several inclined magnets, and several sleeve buffer springs; A pair of the angle rotation shafts are respectively inserted into the oil cylinder, and a pair of the angle rotation shafts are respectively inserted into the fixing bracket through bearings. A pair of the concave arc slideways are relatively parallelly mounted on the fixing bracket. A pair of the convex arc sliders are respectively mounted on both sides of the oil cylinder, and a pair of the convex arc sliders are respectively movably inserted into the inner sides of a pair of the concave arc slideways. A pair of the arc limiting shafts are respectively inserted into the inner sides of a pair of the concave arc slideways, and a pair of the arc limiting shafts are respectively movably inserted into a pair of the convex arc sliders. The L-shaped drainage rotating pipe is inserted into the oil cylinder. The L-shaped drainage limiting pipe is connected to the servo motor, and the L-shaped drainage limiting pipe is sleeved on the outer side of the L-shaped drainage rotating pipe. The rotation limiting disc is sleeved on the L-shaped drainage rotating pipe, and the rotation limiting disc is movably inserted into the inner side of the L-shaped drainage limiting pipe. A pair of the ring electromagnets are respectively mounted on the inner sides of a pair of the concave arc slideways. A pair of the ring magnet blocks are respectively mounted on a pair of the convex arc sliders. Several of the inclined electromagnets are evenly inserted into the inner sides of a pair of the concave arc slideways. Several of the inclined magnets are respectively mounted on both sides of a pair of the convex arc sliders. Several of the sleeve buffer springs are respectively sleeved on a pair of the arc limiting shafts.

2. The hydraulic energy-saving device for the lifting circuit of the heating furnace according to claim 1, wherein, The auxiliary rotation adjustment structure includes: a cylinder limit support block, two pairs of lifting hydraulic push rods, a lifting return block, a pair of toothed telescopic locking blocks, a plurality of telescopic locking shafts, a plurality of telescopic locking sleeve springs, a pair of adsorption electromagnets, a pair of adsorption magnets, a shunt cylinder valve, a pair of lifting limit discs, a pair of lifting limit tubes, and a pair of lifting drainage tubes; A plurality of the nitrogen gas cylinders are evenly installed on the cylinder limit support block, the lifting return block is installed on both sides of the cylinder limit support block, a pair of lifting limit grooves are formed on the fixed bracket, two pairs of the lifting hydraulic push rods are respectively installed inside a pair of the lifting limit grooves, the lifting return block is installed on the pushing ends of the two pairs of the lifting hydraulic push rods, a pair of toothed telescopic grooves are formed inside a pair of the lifting limit grooves, a pair of the toothed telescopic locking blocks are respectively movably inserted inside a pair of the toothed telescopic grooves, a plurality of the telescopic locking shafts are respectively evenly inserted inside a pair of the toothed telescopic grooves, and a plurality of the telescopic locking shafts are respectively movably inserted on a pair of the toothed telescopic locking blocks, a plurality of the telescopic locking sleeve springs are respectively sleeved on a plurality of the telescopic locking shafts, a pair of the adsorption electromagnets are respectively installed inside a pair of the toothed telescopic grooves, a pair of the adsorption magnets are respectively installed on a pair of the toothed telescopic locking blocks, the lifting drainage tube is connected to the plunger type accumulator, the shunt cylinder valve is connected to a plurality of the nitrogen gas cylinders, a pair of the lifting limit tubes are respectively installed on the shunt cylinder valve and the oil cylinder, and a pair of the lifting limit tubes are movably sleeved on a pair of the lifting drainage tubes, the lifting drainage tube is connected to the first electromagnetic directional valve, the lifting limit disc is installed on the lifting drainage tube, and the lifting limit disc is movably inserted inside the lifting limit tube.

3. The hydraulic energy-saving device for the lifting circuit of the heating furnace according to claim 2, characterized in that Sealing structures are provided on the lifting limit tube, the lifting drainage tube, the L-shaped drainage limit tube, and the L-shaped drainage rotating tube; The sealing structure includes: a locking ring strip, a locking lifting ring internal rack, a plurality of locking limit shafts, a plurality of locking vertical sleeve springs, a ring locking lifting electromagnet, a ring locking magnet, a plurality of concave arc limit blocks, a plurality of locking horizontal telescopic shafts, a plurality of locking horizontal sleeve springs, a plurality of arc horizontal telescopic magnets, and a pair of ring horizontal telescopic electromagnets; The L-shaped drainage limiting tube is provided with a rotating circular ring groove, the rotating limiting disc is movably inserted inside the rotating circular ring groove, the locking circular ring strip is installed on the rotating limiting disc, several locking limiting shafts are evenly inserted inside the rotating circular ring groove, the locking lifting circular ring internal rack is movably sleeved on several locking limiting shafts, the lifting limiting tube is provided with several arc telescopic grooves, several concave arc limiting blocks are respectively movably inserted inside several arc telescopic grooves, several locking horizontal telescopic shafts are respectively movably inserted inside several arc telescopic grooves, and several locking horizontal telescopic shafts are respectively movably inserted on several concave arc limiting blocks, several locking vertical sleeve springs are respectively sleeved on several locking limiting shafts, several locking horizontal telescopic shafts are respectively sleeved on several locking horizontal telescopic shafts, the ring locking magnet is installed on the locking lifting circular ring internal rack, the ring locking lifting electromagnet is installed on the rotating circular ring groove, several arc horizontal telescopic magnets are respectively installed on several concave arc limiting blocks, and a pair of ring horizontal telescopic electromagnets are installed inside the lifting limiting tube.

4. The hydraulic energy-saving device for the lifting circuit of the heating furnace according to claim 3, characterized in that, An angle adjuster is provided on a pair of the convex arc sliders.

5. The hydraulic energy-saving device for the lifting circuit of the heating furnace according to claim 4, wherein A pressure auxiliary sensor is provided between the pipelines of the plunger accumulator and the oil cylinder for detecting the oil pressure of the plunger accumulator and the oil pressure of the rodless cavity of the oil cylinder.

6. The hydraulic energy-saving device for the lifting circuit of a heating furnace according to claim 5, characterized in that, A pneumatic end pressure sensor is provided between the nitrogen gas tank and the plunger accumulator for detecting the air pressure of the nitrogen gas tank.

7. The hydraulic energy-saving device for the lifting circuit of the heating furnace according to claim 6, characterized in that, Gas pressure sensors are provided inside several nitrogen gas tanks.

8. The hydraulic energy-saving device for the lifting circuit of a heating furnace according to claim 7, wherein A pair of the convex arc sliders are respectively provided with ball grooves, and moving balls are respectively provided inside several ball grooves.

9. The hydraulic energy-saving device for the lifting circuit of the heating furnace according to claim 8, wherein, A linear bearing is provided between the lifting limiting tube and the lifting drainage tube.

Images