Hydraulic control circuit of blast furnace front uncovering machine

Abstract

The utility model provides a kind of hydraulic control loop of blast furnace front uncovering machine, it is related to hydraulic control technical field, including translation oil cylinder, lifting oil cylinder, translation control unit, lifting control unit and balance valve, translation oil cylinder is connected with uncovering machine, lifting oil cylinder is connected with cover plate, translation control unit includes pressure reducing valve and proportional reversing valve, pressure reducing valve is connected with proportional reversing valve, proportional reversing valve is connected with translation oil cylinder;Lifting control unit includes throttle valve, electro-hydraulic reversing valve and one-way pressure reducing valve, balance valve includes hydraulic control check valve, throttle valve is connected with electro-hydraulic reversing valve, electro-hydraulic reversing valve is connected with lifting oil cylinder.The utility model changes the movement direction of translation oil cylinder by proportional reversing valve, and controls the oil flow into translation oil cylinder, to control the movement speed of translation oil cylinder, improve uncovering machine work efficiency;The speed of lifting oil cylinder is adjusted by throttle valve, the movement direction of lifting oil cylinder is changed by electro-hydraulic reversing valve, realize the lifting and falling of cover plate.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic control technology, and in particular to a hydraulic control circuit for a blast furnace front cover opening machine. Background Technology

[0002] The smoke and dust emitted by blast furnaces during tapping are one of the main sources of air pollution from ironmaking plants. As my country's blast furnace ironmaking industry develops towards large-scale production, in order to reduce air pollution, improve the working environment for workers, and prevent molten iron from splashing after the taphole is opened, large and medium-sized blast furnaces generally adopt iron storage troughs and add arc-shaped covers to the blast furnaces.

[0003] The cover-lifting machine is a device used to lift the main groove arc-shaped cover plate above the taphole in front of the blast furnace. In the past, the cover-lifting machine was driven by a hydraulic motor. Under high temperature environment, the sealing performance deteriorated, making it prone to leakage and even oil spraying accidents. The cover-lifting machine has great inertia when working, making it difficult for the hydraulic motor to position and brake, which can easily cause on-site malfunctions. The original hydraulic system used two-stage speed regulation, which could not meet the usage requirements of the cover-lifting machine. Utility Model Content

[0004] To address the aforementioned technical problems, a hydraulic control circuit for a blast furnace front cover-opening machine is provided. This invention primarily uses a proportional directional valve to change the direction of movement of the translation cylinder and controls the flow rate of oil entering the translation cylinder, thereby controlling the speed of the translation cylinder and improving the working efficiency of the cover-opening machine. A throttle valve adjusts the speed of the lifting cylinder, and an electro-hydraulic directional valve changes the direction of movement of the lifting cylinder, thus achieving the lifting and lowering of the cover plate. The technical means employed in this invention are as follows: A hydraulic control circuit for a blast furnace front cover opening machine includes: a translation cylinder, a lifting cylinder, a translation control unit, a lifting control unit, and a balance valve. The translation cylinder is connected to the cover opening machine and is used to drive the cover opening machine to move horizontally. The lifting cylinder is connected to the cover plate and is used to push the cover plate to complete the lifting and lowering actions. The translation control unit includes a pressure reducing valve and a proportional directional valve. One side of the pressure reducing valve is connected to the oil inlet P via a pipeline, and the other side is connected to one side of the proportional directional valve via a pipeline. One side of the proportional directional valve is connected to the control oil port X, the return oil port T, and the control oil return port L via pipelines, and the other side is connected to the rod-side chamber and the rodless chamber of the translation cylinder via a first pipeline and a second pipeline, respectively. The lifting control unit includes a throttle valve, an electro-hydraulic directional valve, and a one-way pressure reducing valve. The balance valve includes a hydraulically controlled one-way valve. One side of the throttle valve is connected to the oil inlet P via a pipeline, and the other side is connected to one side of the electro-hydraulic directional valve via a pipeline. One side of the electro-hydraulic directional valve is connected to the control oil port X, the return oil port T, and the control oil return port L via pipelines, and the other side is connected to the rod-side and rodless-side chambers of the lifting cylinder via pipelines one and two, respectively. The one-way pressure reducing valve is installed on pipeline one and is connected to the control oil return port L via a pipeline. The hydraulically controlled one-way valve is installed on pipeline two.

[0005] Furthermore, the neutral position function of the proportional directional valve is type O.

[0006] Furthermore, the neutral position function of the electro-hydraulic directional valve is Y-type.

[0007] Furthermore, the translation control unit also includes a first replenishing oil valve and a second replenishing oil valve. The first pipeline and the second pipeline are respectively connected to the control oil return port L through a third pipeline and a fourth pipeline. The first replenishing oil valve and the second replenishing oil valve are respectively installed on the third pipeline and the fourth pipeline.

[0008] Furthermore, the translation control unit also includes a first overflow valve, and the first pipeline is connected to the control oil return port L through a fifth pipeline, with the first overflow valve installed on the fifth pipeline.

[0009] Furthermore, the lifting control unit also includes a second overflow valve, and the hydraulic check valve is connected to the control oil return port L through pipeline three, with the second overflow valve installed on pipeline three.

[0010] Furthermore, the balance valve also includes a third relief valve, which is arranged in parallel with the hydraulic check valve. The two sides of the third relief valve are connected to pipeline two through pipelines, and the third relief valve is also connected to the control oil return port L through a pipeline.

[0011] Compared with the prior art, the present invention has the following advantages: 1. The hydraulic control circuit of the blast furnace front cover opening machine provided by this utility model adopts a proportional directional valve to control the translation cylinder. The neutral position function is "O" type and has a locking function. The computer inputs analog signals (current and voltage) to the proportional directional valve amplifier, which can change the movement direction of the translation cylinder and control the flow rate of the oil entering the translation cylinder, thereby controlling the movement speed of the translation cylinder and improving the working efficiency of the cover opening machine.

[0012] 2. The hydraulic control circuit of the blast furnace front cover opening machine provided by this utility model is designed to prevent overload and negative pressure situations in the translation cylinder during its movement due to the unpredictable changes in external load. By setting two oil replenishment valves, the translation cylinder can be replenished in both directions in a timely manner to avoid damage to the translation cylinder. When there is overpressure, the overflow valve opens to relieve the load and protect the safety of the translation cylinder.

[0013] 3. The hydraulic control circuit of the blast furnace front cover opening machine provided by this utility model has a "Y" type electro-hydraulic directional valve with a load-bearing function in the neutral position to change the movement direction of the lifting cylinder. When electromagnet a is energized, oil enters the rodless chamber of the lifting cylinder to lift the cover plate, and then electromagnet a is de-energized and returns to the neutral position. When electromagnet b is energized, the pressure oil in the rod chamber of the lifting cylinder opens the hydraulic control check valve of the balance valve to form a passage, and the piston rod of the rod chamber of the lifting cylinder retracts inward and the cover plate falls.

[0014] 4. The hydraulic control circuit of the blast furnace front cover opening machine provided by this utility model can prevent speed loss in the forward and reverse directions by adjusting the speed of the lifting cylinder through the throttle valve.

[0015] 5. The hydraulic control circuit of the blast furnace front cover opening machine provided by this utility model has a balance valve installed on the oil port of the rodless chamber of the lifting cylinder. The lifting cylinder is locked by a hydraulic control check valve. When the external load is too heavy, the overflow valve opens to unload and protect the lifting cylinder.

[0016] Based on the above reasons, this utility model can be widely promoted in fields such as hydraulic control. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the hydraulic control circuit of this utility model.

[0019] In the diagram: 1. Translation cylinder; 2. Lifting cylinder; 3. Translation control unit; 31. Pressure reducing valve; 32. Proportional directional valve; 33. First replenishing valve; 34. Second replenishing valve; 35. First relief valve; 4. Lifting control unit; 41. Throttle valve; 42. Electro-hydraulic directional valve; 43. One-way pressure reducing valve; 44. Second relief valve; 5. Balance valve; 51. Hydraulic check valve; 52. Third relief valve. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] like Figure 1 As shown, this utility model provides a hydraulic control circuit for a blast furnace front cover lifting machine, used to drive the cover lifting machine to lift the arc-shaped cover plate above the iron trough. It includes a translation cylinder 1, a lifting cylinder 2, a translation control unit 3, a lifting control unit 4, and a balance valve 5. The translation cylinder 1 has a stroke of 3600mm and is connected to the cover lifting machine to push the machine to move horizontally. The lifting cylinder 2 has a stroke of 585mm and is connected to a linkage mechanism to push the linkage mechanism to complete the lifting and lowering actions. The cover plate is mounted on the linkage mechanism.

[0022] The translation control unit 3 includes a pressure reducing valve 31, a proportional directional valve 32, a first replenishing valve 33, a second replenishing valve 34, and a first overflow valve 35. One side of the pressure reducing valve 31 is connected to the oil inlet P via a pipeline, and the other side is connected to one side of the proportional directional valve 32 via a pipeline. One side of the proportional directional valve 32 is connected to the control oil port X, the return oil port T, and the control oil return port L via pipelines, and the other side is connected to the rod-side and rodless-side chambers of the translation cylinder 1 via the first pipeline and the second pipeline, respectively. The first pipeline and the second pipeline are connected to the control oil return port L via the third pipeline and the fourth pipeline, respectively. The first replenishing valve 33 and the second replenishing valve 34 are installed on the third pipeline and the fourth pipeline, respectively. The first pipeline is connected to the control oil return port L via the fifth pipeline, and the first overflow valve 35 is installed on the fifth pipeline. The pressure reducing valve 31 is set to a pressure of 200 bar; the proportional directional valve 32 has an "O" type neutral position function and a locking function in the neutral position. The computer inputs analog signals (current, voltage) to the proportional directional valve amplifier (existing technology). The proportional directional valve 32 can change the movement direction of the translation cylinder 1 and control the flow rate of the oil entering the translation cylinder 1, thereby controlling the movement speed of the translation cylinder 1 and improving the working efficiency of the capping machine. During the movement of the translation cylinder 1, due to the unpredictable changes in the external load, the translation cylinder 1 will often experience overload and negative pressure. Therefore, the two oil replenishing valves (the first oil replenishing valve 33 and the second oil replenishing valve 34) promptly replenish the translation cylinder 1 in both directions to avoid damage to the translation cylinder 1. When the pressure in the rod chamber of the translation cylinder 1 exceeds 210 bar, the first relief valve 35 opens to unload and protect the safety of the translation cylinder 1.

[0023] The lifting control unit 4 includes a throttle valve 41, an electro-hydraulic directional valve 42, a one-way pressure reducing valve 43, and a second relief valve 44. One side of the throttle valve 41 is connected to the oil inlet P via a pipeline, and the other side is connected to one side of the electro-hydraulic directional valve 42 via a pipeline. One side of the electro-hydraulic directional valve 42 is connected to the control oil port X, the return oil port T, and the control oil return port L via pipelines, respectively. The other side is connected to the rod-side and rodless-side chambers of the lifting cylinder 2 via pipelines one and two, respectively. The one-way pressure reducing valve 43 is installed on pipeline one and is connected to the control oil return port L via a pipeline. The speed of the lifting cylinder 2 is adjusted by the throttle valve 41 to prevent loss of speed control in the forward and reverse directions. The electro-hydraulic directional valve 42 has a "Y"-shaped neutral position function, which has an unloading function and is only used to change the movement direction of the lifting cylinder 2. When electromagnet a is energized, oil enters the rodless chamber of lifting cylinder 2, lifting the cover plate. Then, electromagnet a is de-energized and returns to the neutral position. When electromagnet b is energized, the pressure oil in the rod chamber of lifting cylinder 2 simultaneously opens the hydraulic control check valve 51 of the balance valve 5, forming a passage. The piston rod in the rod chamber of lifting cylinder 2 retracts inward, and the cover plate falls. At this time, the rod chamber of lifting cylinder 2 bears a negative load. To avoid impact, the pressure relief valve 43 is set to 150 bar. When the pressure in the rod chamber of lifting cylinder 2 exceeds 210 bar, the second relief valve 44 opens to unload and protect the safety of lifting cylinder 2.

[0024] The balancing valve 5 includes a hydraulically controlled check valve 51 and a third relief valve 52. The hydraulically controlled check valve 51 is installed on pipeline two and connected to the control oil return port L via pipeline three. The second relief valve 44 is installed on pipeline three. The third relief valve 52 is connected in parallel with the hydraulically controlled check valve 51. The two sides of the third relief valve 52 are connected to pipeline two via pipelines, and the third relief valve 52 is also connected to the control oil return port L via pipelines. The balancing valve 5 is installed on the rodless chamber oil port pipeline of the lifting cylinder 2 and locks the lifting cylinder 2 through the hydraulically controlled check valve 51. When the external load is too heavy and causes the pressure in the rodless chamber of the lifting cylinder 2 to exceed 300 bar, the third relief valve 52 opens to relieve the load and protect the lifting cylinder 2.

[0025] The advantages of this utility model are its compact structure, high control precision, safety and reliability, and sensitive operation, which improves the efficiency of the capping machine.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the 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 or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A hydraulic control circuit for a blast furnace front cover opening machine, characterized in that, include: The system includes a translation cylinder (1), a lifting cylinder (2), a translation control unit (3), a lifting control unit (4), and a balance valve (5). The translation cylinder (1) is connected to the cover lifting machine and is used to drive the cover lifting machine to move horizontally. The lifting cylinder (2) is connected to the cover plate and is used to push the cover plate to complete the lifting and lowering actions. The translation control unit (3) includes a pressure reducing valve (31) and a proportional directional valve (32). One side of the pressure reducing valve (31) is connected to the oil inlet P through a pipeline, and the other side is connected to one side of the proportional directional valve (32) through a pipeline. One side of the proportional directional valve (32) is connected to the control oil port X, the return oil port T, and the control oil return port L through pipelines, respectively, and the other side is connected to the rod chamber and the rodless chamber of the translation cylinder (1) through the first pipeline and the second pipeline, respectively. The lifting control unit (4) includes a throttle valve (41), an electro-hydraulic directional valve (42), and a one-way pressure reducing valve (43). The balance valve (5) includes a hydraulically controlled one-way valve (51). One side of the throttle valve (41) is connected to the oil inlet P through a pipeline, and the other side is connected to one side of the electro-hydraulic directional valve (42) through a pipeline. One side of the electro-hydraulic directional valve (42) is connected to the control oil port X, the return oil port T, and the control oil return port L through pipelines, and the other side is connected to the rod chamber and the rodless chamber of the lifting cylinder (2) through pipeline one and pipeline two, respectively. The one-way pressure reducing valve (43) is installed on pipeline one, and the one-way pressure reducing valve (43) is connected to the control oil return port L through a pipeline. The hydraulically controlled one-way valve (51) is installed on pipeline two.

2. The hydraulic control circuit for the blast furnace front cover opening machine according to claim 1, characterized in that, The neutral position function of the proportional directional valve (32) is type O.

3. The hydraulic control circuit for the blast furnace front cover opening machine according to claim 1, characterized in that, The neutral position function of the electro-hydraulic directional valve (42) is Y-type.

4. The hydraulic control circuit for the blast furnace front cover opening machine according to claim 1, characterized in that, The translation control unit (3) also includes a first oil replenishing valve (33) and a second oil replenishing valve (34). The first pipeline and the second pipeline are respectively connected to the control oil return port L through the third pipeline and the fourth pipeline. The first oil replenishing valve (33) and the second oil replenishing valve (34) are respectively installed on the third pipeline and the fourth pipeline.

5. The hydraulic control circuit for the blast furnace front cover opening machine according to claim 1, characterized in that, The translation control unit (3) also includes a first overflow valve (35), the first pipeline is connected to the control oil return port L through a fifth pipeline, and the first overflow valve (35) is installed on the fifth pipeline.

6. The hydraulic control circuit for the blast furnace front cover opening machine according to claim 1, characterized in that, The lifting control unit (4) also includes a second overflow valve (44). The hydraulic check valve (51) is connected to the control oil return port L through pipeline three, and the second overflow valve (44) is installed on pipeline three.

7. The hydraulic control circuit for the blast furnace front cover opening machine according to claim 1, characterized in that, The balance valve (5) also includes a third overflow valve (52), which is connected in parallel with the hydraulic check valve (51). The two sides of the third overflow valve (52) are connected to the second pipeline through a pipeline, and the third overflow valve (52) is also connected to the control oil return port L through a pipeline.

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