Hydraulic control device for furnace bottom stepping mechanism of heating furnace

Abstract

The utility model relates to a kind of heating furnace bottom stepping mechanism hydraulic control device, belong to metallurgical equipment technical field.The utility model's technical scheme is: balance valve is used in step beam lifting system, and hydraulic dynamic valve control cartridge valve is used in step beam lifting cylinder;Rod cavity and rodless cavity of step beam translation cylinder are all used in hydraulic control check valve, check valve and overflow valve.The utility model has the beneficial effects of: solve the problem of impact when step beam lifting cylinder drops, improve the self-locking precision of step beam lifting cylinder, improve the accuracy, stability of translation cylinder in work.

Description

Technical Field

[0001] This utility model relates to a hydraulic control device for a furnace bottom stepping mechanism, belonging to the field of metallurgical equipment technology. Background Technology

[0002] The furnace bottom walking mechanism is a crucial piece of equipment in large bar rolling production. It features a double-layer frame structure. The mechanism utilizes hydraulic transmission and a double-wheel inclined rail system. The upper layer is a translation frame, moved horizontally by a single walking beam translation cylinder located at the furnace head. The lower layer is a lifting frame, raised and lowered by two walking beam lifting cylinders. The walking mechanism consists of an upper translation frame supporting the movable beam, a lower lifting frame with upper and lower rollers, a translation centering device, a lifting centering device, a walking beam translation hydraulic cylinder, a walking beam lifting hydraulic cylinder, and a lifting inclined rail base. The lifting frame is equipped with two rows of rollers, one upper and one lower. The lower rollers move on the inclined rails, raising or lowering the walking beam; while the translation frame moves horizontally on the upper rollers, moving the walking beam forward and backward.

[0003] The hydraulic control device for the bottom stepping mechanism of the large bar heating furnace currently has the following problems during operation.

[0004] 1. The high speed and large impact during the descent of the stepping beam lifting cylinder often cause piston damage, resulting in cylinder failure and affecting the normal production of the large bars.

[0005] 2. During operation, the walking beam translation cylinder slipped, causing the billets in the heating furnace to stack into a double layer, which seriously affected the normal feeding of the large bar heating furnace.

[0006] These two issues indicate that there are significant defects in the hydraulic control device of the bottom walking mechanism of the bar heating furnace, which restricts the continuous production of the bar rolling line.

[0007] Existing technology CN2022105996916, "A Hydraulic Control System and Method for Lifting Hydraulic Cylinder of a Stepping Mechanism," uses a volumetric speed-regulating pump unit to directly drive the lifting hydraulic cylinder. Due to the long-term wear and tear of the volumetric speed-regulating pump unit, the pressure driving the lifting hydraulic cylinder becomes unstable, thus affecting the operation of the stepping mechanism. The patent "A Hydraulic Control System and Method for Lifting Hydraulic Cylinder of a Stepping Mechanism" uses a back pressure replenishing oil unit to control the descent speed during the descent process. Since the back pressure replenishing oil unit can be a cooling circulating oil with back pressure, the pressure is usually relatively low, which can easily cause overspeed descent, making the lifting hydraulic cylinder and the stepping mechanism unstable during descent, and causing damage to the piston of the lifting hydraulic cylinder. Summary of the Invention

[0008] The purpose of this invention is to provide a hydraulic control device for the stepping mechanism at the bottom of a heating furnace. The stepping beam lifting system utilizes a balance valve to solve the impact problem during the descent of the stepping beam lifting cylinder. The stepping beam lifting cylinder employs a hydraulically controlled cartridge valve to improve its self-locking accuracy. Both the rod-side and rodless sides of the stepping beam translation cylinder utilize hydraulically controlled check valves, one-way valves, and overflow valves. The design of these valves improves the accuracy and stability of the translation cylinder during operation, thus solving the aforementioned problems in the prior art.

[0009] The technical solution of this utility model is: a hydraulic control device for a stepping mechanism at the bottom of a heating furnace, comprising a stepping beam lifting system and a stepping beam translation system. The stepping beam lifting system includes a first stepping beam lifting cylinder and a second stepping beam lifting cylinder. A cylinder-side valve block for the first stepping beam lifting cylinder and a cylinder-side valve block for the second stepping beam lifting cylinder are respectively installed on the first stepping beam lifting cylinder and the second stepping beam lifting cylinder. A first hydraulic valve, a first cartridge valve, and a first overflow valve are installed on the cylinder-side valve block of the first stepping beam lifting cylinder. A second hydraulic valve, a second cartridge valve, and a second overflow valve are installed on the cylinder-side valve block of the second stepping beam lifting cylinder. One of the oil ports on both sides of the first cartridge valve is connected to the rodless chamber of the first lifting cylinder of the stepping beam, and the other oil port is connected to the first relief valve. The spring chamber of the first cartridge valve is connected to the output oil port of the first hydraulic valve. The hydraulic valves of the second hydraulic valve, the second cartridge valve and the second relief valve are composed of the same structure. The walking beam translation system includes a walking beam translation cylinder and a translation proportional valve. A translation high-pressure ball valve is installed between the translation proportional valve and the pressure pipeline from the hydraulic pump station. A translation return oil check valve is installed between the T port of the translation proportional valve and the return oil pipeline. A left hydraulically controlled check valve and a right hydraulically controlled check valve are respectively connected to the A port and B port of the translation proportional valve. A hydraulically controlled one-way leakage oil check valve is installed between the leakage oil port of the left and right hydraulically controlled check valves and the leakage oil return oil tank pipeline. A left check valve and a left relief valve are installed in parallel between the left hydraulically controlled check valve and the rodless chamber of the walking beam translation cylinder, and a right check valve and a right relief valve are installed in parallel between the right hydraulically controlled check valve and the rod chamber of the walking beam translation cylinder. The left relief valve and the right relief valve are located at the inlet and outlet of the walking beam translation cylinder for overload protection. The left check valve and the right check valve are also located at the inlet and outlet of the walking beam translation cylinder for oil replenishment.

[0010] The walking beam lifting system is also equipped with a lifting proportional valve, which connects the first lifting cylinder and the second lifting cylinder of the walking beam. A lifting high-pressure ball valve is installed between the P port of the lifting proportional valve and the pressure oil pipeline. A lifting return oil check valve and a lifting proportional valve leakage oil check valve are also installed between the T port and L port of the lifting proportional valve and the return oil pipeline and the leakage oil return tank pipeline, respectively.

[0011] A balance valve is also installed between the lifting proportional valve and the first lifting cylinder and the second lifting cylinder of the walking beam; a lifting reversing valve is also installed in the walking beam lifting system, and the lifting reversing valve is connected to the first hydraulic valve and the second hydraulic valve.

[0012] The walking beam translation system is also equipped with a translation reversing valve. A main high-pressure filter and a backup high-pressure filter are installed in parallel between the translation reversing valve and the high-pressure pipeline from the pump station. The output port of the translation reversing valve is connected to the control ports of the left hydraulic control check valve and the right hydraulic control check valve.

[0013] The beneficial effects of this utility model are as follows: the step beam lifting system uses a balance valve to solve the impact problem when the step beam lifting cylinder descends; the step beam lifting cylinder uses a hydraulically controlled cartridge valve to improve the self-locking accuracy of the step beam lifting cylinder; both the rod-side and rodless sides of the step beam translation cylinder use hydraulically controlled check valves, check valves, and relief valves. The design of these valves improves the accuracy and stability of the translation cylinder during operation. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model; In the diagram: 1. First lifting cylinder of the walking beam; 2. Second lifting cylinder of the walking beam; 3. Translation cylinder of the walking beam; 4. First hydraulic valve; 5. First cartridge valve; 6. First overflow valve; 7. Second hydraulic valve; 8. Second cartridge valve; 9. Second overflow valve; 10. Balance valve; 11. Lifting directional valve; 12. Lifting proportional valve leakage check valve; 13. Lifting return check valve; 14. Lifting high-pressure ball valve; 15. Translation directional valve; 16. Left check valve; 17. Left overflow valve; 18. Right check valve; 19. Right overflow valve; 20. Left hydraulic control check valve; 21. Right hydraulic control check valve; 22. Translation proportional valve; 23. Translation high-pressure ball valve; 24. Translation return check valve; 25. Hydraulic control one-way leakage check valve; 26. Main high-pressure filter; 27. Backup high-pressure filter; 28. Lifting proportional valve; 29. ​​First lifting cylinder side valve block; 30. Second lifting cylinder side valve block. Detailed Implementation

[0015] To make the purpose, technical solution, and advantages of this utility model clearer, the technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described implementation cases are only a small part of this utility model, not all of them. All other implementation cases obtained by those skilled in the art based on the implementation cases of this utility model without creative effort are within the protection scope of this utility model.

[0016] A hydraulic control device for a stepping beam mechanism at the bottom of a heating furnace includes a stepping beam lifting system and a stepping beam translation system. The stepping beam lifting system includes a first stepping beam lifting cylinder 1 and a second stepping beam lifting cylinder 2. A cylinder-side valve block 29 for the first stepping beam lifting cylinder 1 and a cylinder-side valve block 30 for the second stepping beam lifting cylinder 20 are respectively installed on the cylinder-side valve block 29. A first hydraulic valve 4, a first cartridge valve 5, and a first overflow valve 6 are installed on the cylinder-side valve block 29. A second hydraulic valve 7, a second cartridge valve 8, and a second overflow valve 9 are installed on the cylinder-side valve block 30 for the second stepping beam lifting cylinder. One of the oil ports on both sides of the first cartridge valve 5 is connected to the rodless chamber of the first lifting cylinder 1 of the stepping beam, and the other oil port is connected to the first relief valve 6. The spring chamber of the first cartridge valve 5 is connected to the output oil port of the first hydraulic valve 4. The hydraulic valves of the second hydraulic valve 7, the second cartridge valve 8 and the second relief valve 9 have the same composition. The walking beam translation system includes a walking beam translation cylinder 3 and a translation proportional valve 22. A translation high-pressure ball valve 23 is installed between the translation proportional valve 22 and the pressure pipeline from the hydraulic pump station. A translation return oil check valve 24 is installed between the T port of the translation proportional valve 22 and the return oil pipeline. A left hydraulically controlled check valve 20 and a right hydraulically controlled check valve 21 are respectively connected to the A port and B port of the translation proportional valve 22. A leakage oil port of the left hydraulically controlled check valve 20 and the right hydraulically controlled check valve 21 is connected to the leakage oil return oil tank pipeline. There is a hydraulically controlled one-way leakage check valve 25; a left check valve 16 and a left relief valve 17 are installed in parallel between the left hydraulically controlled check valve 20 and the rodless chamber of the stepping beam translation cylinder 3, and a right check valve 18 and a right relief valve 19 are installed in parallel between the right hydraulically controlled check valve 21 and the rod chamber of the stepping beam translation cylinder 3; the left relief valve 17 and the right relief valve 19 are located at the inlet and outlet of the stepping beam translation cylinder 3 and serve as overload protection; the left check valve 16 and the right check valve 18 are also located at the inlet and outlet of the stepping beam translation cylinder 3 and serve as oil replenishment.

[0017] The stepping beam lifting system is also equipped with a lifting proportional valve 28, which is connected to the first lifting cylinder 1 and the second lifting cylinder 2 of the stepping beam. A lifting high-pressure ball valve 14 is installed between the P port of the lifting proportional valve 28 and the pressure oil pipeline. A lifting return oil check valve 13 and a lifting proportional valve leakage oil check valve 12 are also installed between the T port and L port of the lifting proportional valve 28 and the return oil pipeline and the leakage oil return tank pipeline, respectively.

[0018] A balance valve 10 is also installed between the lifting proportional valve 28 and the first lifting cylinder 1 and the second lifting cylinder 2 of the stepping beam; a lifting reversing valve 11 is also installed in the stepping beam lifting system, and the lifting reversing valve 11 is connected to the first hydraulic valve 4 and the second hydraulic valve 7.

[0019] The stepping beam translation system is also equipped with a translation reversing valve 15. A main high-pressure filter 26 and a backup high-pressure filter 27 are installed in parallel between the translation reversing valve 15 and the high-pressure pipeline from the pump station. The output port of the translation reversing valve 15 is connected to the control ports of the left hydraulic control check valve 20 and the right hydraulic control check valve 21.

[0020] In practical applications, the first lifting cylinder 1 and the second lifting cylinder 2 of the walking beam lifting system are respectively equipped with a cylinder-side valve block 29 for the first lifting cylinder and a cylinder-side valve block 30 for the second lifting cylinder. A first hydraulic valve 4, a first cartridge valve 5 and a first relief valve 6 are installed on the cylinder-side valve block 29 of the first lifting cylinder 1, and a second hydraulic valve 7, a second cartridge valve 8 and a second relief valve 9 are installed on the cylinder-side valve block 30 of the second lifting cylinder 2. The first cartridge valve 5 is installed on the valve block 29 next to the first lifting cylinder of the stepping beam. One side of the oil port is connected to the rodless chamber of the first lifting cylinder 1 of the stepping beam, and the other side of the oil port is connected to the first relief valve 6. The spring chamber of the first cartridge valve 5 is connected to the output oil port of the first hydraulic valve 4. When the first hydraulic valve 4 is in the original position under the action of the return spring, the pressure oil in the rodless chamber of the first lifting cylinder 1 of the stepping beam acts on the spring chamber through the first hydraulic valve 4, and the first cartridge valve 5 is in a closed and self-locking state. When the solenoid valve 1DT of the lifting reversing valve 11 is energized, the control pressure oil pushes the valve core of the first hydraulic valve 4 to reverse. The pressure oil in the rodless chamber of the first lifting cylinder 1 of the stepping beam is locked in the first hydraulic valve 4, and the hydraulic oil in the spring chamber of the first cartridge valve 5 flows into the return oil line through the first hydraulic valve 4. At this time, the oil port of the first cartridge valve 5 facing the valve core can be opened by the pressure oil. The hydraulic valve composition and working principle of the second hydraulic valve 7, the second cartridge valve 8, and the second relief valve 9 installed on the second lifting cylinder 2 of the stepping beam and the cylinder-side valve block 30 of the second lifting cylinder of the stepping beam are the same as those of the hydraulic valve composition and working principle of the first hydraulic valve 4, the first cartridge valve 5, and the first relief valve 6 installed on the first lifting cylinder 1 of the stepping beam and the cylinder-side valve block 29 of the first lifting cylinder of the stepping beam.

[0021] A lifting proportional valve 28 is also installed in the walking beam lifting system to control the lifting of the first lifting cylinder 1 and the second lifting cylinder 2 of the walking beam. A lifting high-pressure ball valve 14 is also installed between the P port of the lifting proportional valve 28 and the pressure oil pipeline. A lifting return oil check valve 13 and a lifting proportional valve leakage oil check valve 12 are also installed between the T port and L port of the lifting proportional valve 28 and the return oil pipeline and the leakage oil return tank pipeline.

[0022] A balance valve 10 is also installed between the lifting proportional valve 28 and the first lifting cylinder 1 and the second lifting cylinder 2 of the stepping beam. This valve controls the descent speed of the first lifting cylinder 1 and the second lifting cylinder 2. A lifting directional valve 11 is also installed in the stepping beam lifting system. When the solenoid 1DT of the lifting directional valve 11 is de-energized, the control oil of the first hydraulic valve 4 and the second hydraulic valve 7 flows back to the oil tank through the return oil line via the lifting directional valve 11, and the valve cores of the first hydraulic valve 4 and the second hydraulic valve 7 do not switch directions. When the solenoid 1DT of the lifting directional valve 11 is energized, the pressure oil output from the lifting directional valve 11 enters the first hydraulic valve 4 and the second hydraulic valve 7 respectively, causing the valve cores of the first hydraulic valve 4 and the second hydraulic valve 7 to switch directions.

[0023] A translation proportional valve 22 is installed in the stepping beam translation system. A translation high-pressure ball valve 23 is installed between the translation proportional valve 22 and the pressure pipeline from the hydraulic pump station. A translation return oil check valve 24 is installed between the T port of the translation proportional valve 22 and the return oil pipeline. A left hydraulic control check valve 20 and a right hydraulic control check valve 21 are respectively connected to the A port and B port of the translation proportional valve 22. A hydraulic control check valve 25 is also installed between the leakage oil port of the left hydraulic control check valve 20 and the right hydraulic control check valve 21 and the leakage oil return oil tank pipeline. A left check valve 16 and a left relief valve 17 are also installed in parallel between the left hydraulic control check valve 20 and the rodless chamber of the stepping beam translation cylinder 3. A right check valve 18 and a right relief valve 19 are also installed in parallel between the right hydraulic control check valve 21 and the rod chamber of the stepping beam translation cylinder 3. Left overflow valve 17 and right overflow valve 19 are located at the inlet and outlet of stepping beam translation cylinder 3, serving as overload protection. Left check valve 16 and right check valve 18 are also located at the inlet and outlet of stepping beam translation cylinder 3, used for oil replenishment.

[0024] The walking beam translation system is also equipped with a translation directional valve 15. A main high-pressure filter 26 and a backup high-pressure filter 27 are installed in parallel between the translation directional valve 15 and the high-pressure pipeline from the pump station to filter the oil flowing through the translation directional valve 15. The output port of the translation directional valve 15 is connected to the control ports of the left hydraulic control check valve 20 and the right hydraulic control check valve 21. When the solenoid 2DT of the translation directional valve 15 is de-energized, the control oil from the left hydraulic control check valve 20 and the right hydraulic control check valve 21 flows into the return oil pipeline through the translation directional valve 15 and the hydraulic control one-way leakage check valve 25, and the left hydraulic control check valve 20 and the right hydraulic control check valve 21 are locked in one direction. When the solenoid 2DT of the translation directional valve 15 is energized, the high-pressure oil opens the left hydraulic control check valve 20 and the right hydraulic control check valve 21 through the translation directional valve 15.

[0025] The working process of the hydraulic control device for the bottom stepping mechanism of the large bar heating furnace is as follows.

[0026] The initial position of the stepping mechanism at the bottom of the large bar heating furnace is as follows: the pistons of the two hydraulic cylinders, the first lifting cylinder 1 and the second lifting cylinder 2, are both at the bottom of the cylinder, and the piston of the stepping cylinder 3 is also at the bottom of the cylinder.

[0027] Walking beam lifting cylinder rises

[0028] The pressure oil output from the right-position reversing valve 28 of the PLC-controlled walking beam of the heating furnace passes through the balance valve 10 and opens the valve cores of the first cartridge valve 5 and the second cartridge valve 8 respectively, entering the rodless chambers of the first lifting cylinder 1 and the second lifting cylinder 2 of the walking beam. This pushes the pistons, piston rods, and walking beams of the first lifting cylinder 1 and the second lifting cylinder 2 of the walking beam to rise. The hydraulic oil in the rod chambers of the first lifting cylinder 1 and the second lifting cylinder 2 of the walking beam flows back to the oil tank through the lifting proportional valve 28, the lifting return oil check valve 13, and the return oil pipeline. When the walking beam rises to the upper limit, the lifting proportional valve 28 controlled by the PLC of the heating furnace walking beam is in the middle position, the lifting proportional valve 28 stops outputting pressure oil, the solenoid 1DT of the lifting reversing valve 11 is de-energized, the first hydraulic valve 4 and the second hydraulic valve 7 are in the original position, the pressure oil in the rodless chamber of the first lifting cylinder 1 and the second lifting cylinder 2 of the walking beam acts on the spring chamber of the first cartridge valve 5 and the second cartridge valve 8 respectively through the first hydraulic valve 4 and the second hydraulic valve 7, and the first cartridge valve 5, the second cartridge valve 8 and the balance valve 10 are in the locked state.

[0029] The stepping beam translation cylinder moves forward and backward.

[0030] When the walking beam reaches its upper limit, the PLC-controlled translation proportional valve 22 of the heating furnace walking beam operates in the right position and outputs high-pressure oil. At the same time, the electromagnet 2DT of the translation reversing valve 15 is energized. The pressure oil passing through the main high-pressure filter 26 enters the left hydraulic control check valve 20 and the right hydraulic control check valve 21 through the translation reversing valve 15, opening the left hydraulic control check valve 20 and the right hydraulic control check valve 21. The PLC-controlled translation proportional valve 22 of the heating furnace walking beam operates in the right position and outputs high-pressure oil, which enters the rodless chamber of the walking beam translation cylinder 3 through the left hydraulic control check valve 20, pushing the piston, piston rod and the connected walking beam forward. The hydraulic oil in the rod chamber of the walking beam translation cylinder 3 flows back to the oil tank through the right hydraulic control check valve 21, the translation proportional valve 22, the translation return oil check valve 24 and the return oil pipeline. When the walking beam moves to the front limit, the PLC control of the walking beam of the heating furnace operates the translation proportional valve 22 in the neutral position and does not output high-pressure oil. At the same time, the electromagnet 2DT of the translation reversing valve 15 is de-energized. The control oil of the left hydraulic control check valve 20 and the right hydraulic control check valve 21 flows back to the oil tank through the translation reversing valve 15, the hydraulic control one-way leakage oil check valve 25 and the return oil pipeline. The left hydraulic control check valve 20 and the right hydraulic control check valve 21 are in a self-locking state.

[0031] Walking beam lifting cylinder descends

[0032] When the walking beam reaches its front limit, the left-position reversing output pressure oil of the lifting proportional valve 28 controlled by the PLC of the heating furnace walking beam enters the rod chamber of the first lifting cylinder 1 and the second lifting cylinder 2 of the walking beam, pushing the piston, piston rod, and walking beam to descend. At the same time, the solenoid 1DT of the lifting reversing valve 11 is energized, and the pressure oil enters the control port of the first hydraulic valve 4 and the second hydraulic valve 7 through the lifting reversing valve 11, pushing the valve cores of the first hydraulic valve 4 and the second hydraulic valve 7 to reverse. The pressure oil in the spring chamber of the first cartridge valve 5 and the second cartridge valve 8 flows back to the oil tank through the return oil line from the first hydraulic valve 4 and the second hydraulic valve 7, respectively. The first cartridge valve 5 and the second cartridge valve 8 open, and part of the pressure oil output from the left-position reversing output pressure oil of the lifting proportional valve 28 controlled by the PLC of the heating furnace walking beam acts on the control oil port of the balance valve 10 and causes the balance valve 10 to switch to the descending throttling mode. The hydraulic oil in the rodless chambers of the first lifting cylinder 1 and the second lifting cylinder 2 of the walking beam flows back to the oil tank via the first cartridge valve 5, the second cartridge valve 8, the balance valve 10, the lifting proportional valve 28, the lifting return oil check valve 13, and the return oil pipeline. When the walking beam descends to the lower limit, the lifting proportional valve 28, controlled by the PLC of the heating furnace walking beam, is in the intermediate position, and the solenoid 1DT of the lifting directional valve 11 is de-energized. The control oil of the first hydraulic valve 4 and the second hydraulic valve 7 flows back to the oil tank via the lifting directional valve 11 and the lifting proportional valve leakage oil check valve 12. The first hydraulic valve 4 and the second hydraulic valve 7 are reset by the spring valve core. The pressure oil in the rodless chambers of the first lifting cylinder 1 and the second lifting cylinder 2 of the walking beam acts on the spring chambers of the first cartridge valve 5 and the second cartridge valve 8 via the first hydraulic valve 4 and the second hydraulic valve 7, respectively. The first cartridge valve 5 and the second cartridge valve 8 are self-locking. Stepping beam translation cylinder backward translation

[0033] When the walking beam descends to the lower limit, the PLC control of the heating furnace walking beam causes the translation proportional valve 22 to operate in the left position and output high-pressure oil. At the same time, the electromagnet 2DT of the translation reversing valve 15 is energized. The pressure oil passing through the main high-pressure filter 26 enters the left hydraulic control check valve 20 and the right hydraulic control check valve 21 through the translation reversing valve 15, opening the left hydraulic control check valve 20 and the right hydraulic control check valve 21. The PLC control of the heating furnace walking beam causes the translation proportional valve 22 to operate in the left position and output high-pressure oil, which enters the rod chamber of the walking beam translation cylinder 3 through the right hydraulic control check valve 21, pushing the piston, piston rod and the connected walking beam to move backward. The hydraulic oil in the rodless chamber of the walking beam translation cylinder 3 flows back to the oil tank through the left hydraulic control check valve 20, the translation proportional valve 22, the translation return oil check valve 24 and the return oil pipeline. When the walking beam moves to the rear limit, the PLC control of the walking beam of the heating furnace operates the translation proportional valve 22 in the neutral position and does not output high-pressure oil. At the same time, the electromagnet 2DT of the translation reversing valve 15 is de-energized. The control oil of the left hydraulic control check valve 20 and the right hydraulic control check valve 21 flows back to the oil tank through the translation reversing valve 15, the hydraulic control one-way leakage oil check valve 25 and the return oil pipeline. The left hydraulic control check valve 20 and the right hydraulic control check valve 21 are in a self-locking state.

[0034] Then, the walking beam lifting cylinder rises, the walking beam translation cylinder moves forward, the walking beam lifting cylinder falls, and the walking beam translation cylinder moves backward in a repetitive cycle. The furnace bottom walking mechanism realizes the transportation of billets in the furnace through the stepping action of the walking beam.

[0035] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A hydraulic control device for a furnace bottom stepping mechanism, characterized in that: The system includes a walking beam lifting system and a walking beam translation system. The walking beam lifting system includes a first walking beam lifting cylinder (1) and a second walking beam lifting cylinder (2). The first walking beam lifting cylinder (1) and the second walking beam lifting cylinder (2) are respectively equipped with a cylinder-side valve block (29) and a cylinder-side valve block (30). The cylinder-side valve block (29) of the first walking beam lifting cylinder is equipped with a first hydraulic valve (4), a first cartridge valve (5) and a first overflow valve (6). The cylinder-side valve block (30) of the second walking beam lifting cylinder is equipped with a second hydraulic valve (7), a second cartridge valve (8) and a second overflow valve (9). One of the oil ports on both sides of the first cartridge valve (5) is connected to the rodless chamber of the first lifting cylinder (1) of the stepping beam, and the other oil port is connected to the first relief valve (6). The spring chamber of the first cartridge valve (5) is connected to the output oil port of the first hydraulic valve (4). The hydraulic valves of the second hydraulic valve (7), the second cartridge valve (8) and the second relief valve (9) are composed of the same hydraulic valves. The stepping beam translation system includes a stepping beam translation cylinder (3) and a translation proportional valve (22). A translation high-pressure ball valve (23) is installed between the translation proportional valve (22) and the pressure pipeline from the hydraulic pump station. A translation return oil check valve (24) is installed between the T port of the translation proportional valve (22) and the return oil pipeline. A left hydraulic control check valve (20) and a right hydraulic control check valve (21) are respectively connected to the A port and B port of the translation proportional valve (22). A hydraulic control check valve is installed between the leakage port of the left hydraulic control check valve (20) and the right hydraulic control check valve (21) and the leakage oil return oil tank pipeline. A one-way valve (25) is installed to leak oil; a left one-way valve (16) and a left relief valve (17) are installed in parallel between the left hydraulic control one-way valve (20) and the rodless chamber of the stepping beam translation cylinder (3), and a right one-way valve (18) and a right relief valve (19) are installed in parallel between the right hydraulic control one-way valve (21) and the rod chamber of the stepping beam translation cylinder (3); the left relief valve (17) and the right relief valve (19) are set at the inlet and outlet of the stepping beam translation cylinder (3) to play the role of overload protection; the left one-way valve (16) and the right one-way valve (18) are also set at the inlet and outlet of the stepping beam translation cylinder (3) to play the role of oil replenishment.

2. The hydraulic control device for the furnace bottom stepping mechanism of a heating furnace according to claim 1, characterized in that: The stepping beam lifting system is also equipped with a lifting proportional valve (28), which connects the first lifting cylinder (1) and the second lifting cylinder (2) of the stepping beam. A lifting high-pressure ball valve (14) is installed between the P port of the lifting proportional valve (28) and the pressure oil pipeline. A lifting return oil check valve (13) and a lifting proportional valve leakage oil check valve (12) are also installed between the T port and L port of the lifting proportional valve (28) and the return oil pipeline and the leakage oil return tank pipeline, respectively.

3. The hydraulic control device for the furnace bottom stepping mechanism of a heating furnace according to claim 2, characterized in that: A balance valve (10) is also installed between the lifting proportional valve (28) and the first lifting cylinder (1) and the second lifting cylinder (2) of the stepping beam; a lifting reversing valve (11) is also installed in the stepping beam lifting system, and the lifting reversing valve (11) is connected to the first hydraulic valve (4) and the second hydraulic valve (7).

4. The hydraulic control device for the furnace bottom stepping mechanism of a heating furnace according to claim 1, characterized in that: The stepping beam translation system is also equipped with a translation reversing valve (15). A main high-pressure filter (26) and a backup high-pressure filter (27) are installed in parallel between the translation reversing valve (15) and the high-pressure pipeline from the pump station. The output port of the translation reversing valve (15) is connected to the control ports of the left hydraulic control check valve (20) and the right hydraulic control check valve (21).

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