Hydraulic control structure of movable smoke hood

Abstract

The utility model discloses a hydraulic control structure of a movable smoke hood, which comprises a hydraulic cylinder (9), the inside of the hydraulic cylinder (9) is divided into a rod cavity and a rodless cavity, the hydraulic cylinder (9) is connected with a balance valve (6) through a pipeline, the balance valve (6) is connected with a throttle valve (5) through a pipeline, the throttle valve (5) is connected with an electromagnetic stop valve (4) through a pipeline, and the electromagnetic stop valve (4) is connected with the electromagnetic stop valve (4) through a pipeline. The electromagnetic stop valve (4) is connected with an electro-hydraulic directional control valve (3) through a pipeline, the electro-hydraulic directional control valve (3) is connected with an external oil tank through a pipeline, and the electromagnetic stop valve (4) is of a manual stacking type; an electromagnetic stop valve (4) is newly added to replace an original balance valve (6) for pressure maintaining, the rodless cavity design single balance valve (6) is matched with the electromagnetic stop valve (4), the problem that a hydraulic cylinder (9) suddenly descends when the electromagnetic stop valve (4) is opened is solved, and the hydraulic cylinder (9) is stacked together with other valves in a stacked mode, so that the modification workload is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of hydraulic cylinder technology. Specifically, this utility model relates to a hydraulic control structure for a movable fume hood. Background Technology

[0002] The movable hood of the converter in the steelmaking department is raised and lowered by a hydraulic cylinder. The movable hood is interlocked with the converter. When it is at the upper limit, the furnace can rotate. When it is at the lower limit, the furnace cannot rotate, thus preventing safety accidents.

[0003] A specification published on January 20, 2016, with application number 201520714730.8, discloses a hydraulic control system for lifting and lowering a converter hood. The system includes a reversing valve, a throttle valve, a pressure reducing valve, and a synchronous motor. The inlet and outlet of the reversing valve are connected to the outlet and inlet pipes of the oil tank, respectively. Working port B is connected to one end of the throttle valve, and working port A is connected to one end of the pressure reducing valve. The other end of the throttle valve is connected to the synchronous motor. The synchronous motor comprises four motors connected by synchronous shafts, with the outlets of the four motors connected to the rod chambers of the hydraulic cylinders of the four converter hood hydraulic cylinders. The pressure reducing valve is a three-way pressure reducing valve, through which pressurized oil enters the rodless chamber of the cylinder. By using a synchronous motor to control the synchronous function of the lifting and lowering device of the converter hood, the system ensures normal steelmaking production due to the high machining accuracy, simple principle, strong operability, high synchronization accuracy, and ability to meet functional requirements of the synchronous motor.

[0004] During production, the hydraulic cylinders often descend automatically. If the limit switch cannot detect the signal, the converter cannot smelt, causing chaos in converter production and severely restricting the smooth operation of production. If the movable fume hood is not used, the converter will emit smoke, which may cause an environmental accident in severe cases. Utility Model Content

[0005] The present invention aims to provide a hydraulic control structure for a movable fume hood that can improve the safety of hydraulic cylinder operation.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a hydraulic control structure for a movable fume hood, comprising a hydraulic cylinder, wherein the hydraulic cylinder is divided into a rod chamber and a rodless chamber, the hydraulic cylinder is connected to a balance valve via a pipeline, the balance valve is connected to a throttle valve via a pipeline, the throttle valve is connected to an electromagnetic shut-off valve via a pipeline, the electromagnetic shut-off valve is connected to an electro-hydraulic directional valve via a pipeline, and the electro-hydraulic directional valve is connected to an external oil tank via a pipeline.

[0007] A first high-pressure ball valve is provided between the electro-hydraulic directional valve and the oil tank.

[0008] A pressure gauge is installed on the oil inlet of the electro-hydraulic directional valve.

[0009] The electromagnetic shut-off valve is a manually stacked type.

[0010] The balance valve is a cartridge type connected to the rodless chamber of the hydraulic cylinder.

[0011] The hydraulic cylinder is equipped with a second high-pressure ball valve, which is connected to the rodless chamber and the rod chamber of the hydraulic cylinder respectively.

[0012] A pressure measuring point is provided between the second high-pressure ball valve and the hydraulic cylinder.

[0013] The technical advantages of this utility model are as follows: a new electromagnetic shut-off valve is added to replace the original balance valve for pressure holding. The rodless chamber design of the single balance valve and the electromagnetic shut-off valve work together to alleviate the problem of sudden drop of the hydraulic cylinder when the electromagnetic shut-off valve is opened. In addition, the use of a manual electromagnetic shut-off valve can ensure that personnel can manually raise the hydraulic cylinder to the upper limit in special situations such as power outages, thus ensuring smooth smelting. Attached Figure Description

[0014] This manual includes the following figures, which illustrate the following:

[0015] Figure 1 This is a schematic diagram of the hydraulic control structure for a movable fume hood according to the present invention.

[0016] The following are marked in the diagram: 1. Second high-pressure ball valve; 2. Pressure gauge; 3. Electro-hydraulic directional valve; 4. Solenoid shut-off valve; 5. Throttle valve; 6. Balance valve; 7. First high-pressure ball valve; 8. Pressure measuring point; 9. Hydraulic cylinder. Detailed Implementation

[0017] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the utility model concept and technical solution, and to facilitate its implementation.

[0018] Please see Figure 1 A hydraulic control structure for a movable fume hood includes a hydraulic cylinder 9, which is divided into a rod chamber and a rodless chamber. The hydraulic cylinder 9 is connected to a balance valve 6 via a pipeline. The balance valve 6 is connected to a throttle valve 5 via a pipeline. The throttle valve 5 is connected to an electromagnetic shut-off valve 4 via a pipeline. The electromagnetic shut-off valve 4 is connected to an electro-hydraulic directional valve 3 via a pipeline. The electro-hydraulic directional valve 3 is connected to an external oil tank via a pipeline. The newly added electromagnetic shut-off valve 4 replaces the original balance valve 6 for pressure maintenance. The rodless chamber design allows the balance valve 6 and the electromagnetic shut-off valve 4 to work together to alleviate the problem of sudden descent of the hydraulic cylinder 9 when the electromagnetic shut-off valve 4 opens.

[0019] A first high-pressure ball valve 7 is installed between the electro-hydraulic directional valve 3 and the oil tank; two protection pipelines are provided.

[0020] A pressure gauge 2 is installed on the oil inlet end of the electro-hydraulic directional valve 3; it can monitor the pipeline pressure in real time and take protective measures as early as possible.

[0021] The electromagnetic shut-off valve 4 is a manual stacking type; using the stacking type to stack with other valves reduces the amount of modification work.

[0022] The balance valve 6 is a cartridge type connected to the rodless chamber of the hydraulic cylinder 9; the balance valve 6 is disconnected from the rod chamber of the hydraulic cylinder 9, and the rodless chamber is designed to work together with the solenoid shut-off valve 4 to alleviate the problem of the hydraulic cylinder 9 suddenly dropping when the solenoid shut-off valve 4 opens.

[0023] The hydraulic cylinder 9 is equipped with a second high-pressure ball valve 1, which is connected to the rodless chamber and the rod chamber of the hydraulic cylinder 9 respectively; multiple high-pressure ball valves are used to protect the pipeline and control the opening and closing of the pipeline.

[0024] A pressure measuring point 8 is provided between the second high-pressure ball valve 1 and the hydraulic cylinder 9; the pressure of the hydraulic cylinder 9 can be measured in time.

[0025] Hydraulic working principle: When the piston rod of hydraulic cylinder 9 extends, the electro-hydraulic directional valve 3b is energized (P→A), and the solenoid shut-off valves 4a and 4b are simultaneously energized. Oil inlet path: Second high-pressure ball valve 1 → Electro-hydraulic directional valve 3 (P→A) → Solenoid shut-off valve 4(a) → Throttle valve 5 → Balance valve 6 → First high-pressure ball valve 7 → Hydraulic cylinder 9 (rodless chamber). Oil return path: Hydraulic cylinder 9 (rod chamber) → High-pressure ball valve 7 → Throttle valve 5 → Solenoid shut-off valve 4(b) → Electro-hydraulic directional valve 3 (B→T) → Second high-pressure ball valve 1 → Return oil tank; When the piston rod of hydraulic cylinder retracts, the electro-hydraulic directional valve 3a is energized (P→B), and the solenoid shut-off valves 4a and 4b are simultaneously energized.

[0026] After reversal, the oil inlet circuit is as follows: Second high-pressure ball valve 1 → Electro-hydraulic directional valve 3 (P→B) → Solenoid shut-off valve 4 (b) → Throttle valve 5 → First high-pressure ball valve 7 → Hydraulic cylinder 9 (rod chamber). The oil return circuit is as follows: Hydraulic cylinder 9 (rodless chamber) → First high-pressure ball valve 7 → Balance valve 6 → Throttle valve 5 → Solenoid shut-off valve 4 (a) → Electro-hydraulic directional valve 3 (A→T) → Second high-pressure ball valve 1 → Oil return tank.

[0027] The technical advantages of this utility model are as follows: a new electromagnetic shut-off valve 4 is added to replace the original balance valve 6 for pressure holding. The rodless chamber design of the single balance valve 6 and the electromagnetic shut-off valve 4 work together to alleviate the problem of the hydraulic cylinder 9 suddenly dropping when the electromagnetic shut-off valve 4 is opened. In addition, the use of a manual electromagnetic shut-off valve 4 can prevent the hydraulic cylinder 9 from being raised to the upper limit by personnel using the manual function in special circumstances such as power outages, thus ensuring smooth smelting.

[0028] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A hydraulic control structure for a movable fume hood, characterized in that: Includes a hydraulic cylinder (9), which is divided into a rod chamber and a rodless chamber. The hydraulic cylinder (9) is connected to a balance valve (6) through a pipeline. The balance valve (6) is connected to a throttle valve (5) through a pipeline. The throttle valve (5) is connected to an electromagnetic shut-off valve (4) through a pipeline. The electromagnetic shut-off valve (4) is connected to an electro-hydraulic directional valve (3) through a pipeline. The electro-hydraulic directional valve (3) is connected to an external oil tank through a pipeline.

2. The hydraulic control structure for a movable fume hood according to claim 1, characterized in that: A first high-pressure ball valve (7) is provided between the electro-hydraulic directional valve (3) and the oil tank.

3. The hydraulic control structure for a movable fume hood according to claim 1, characterized in that: A pressure gauge (2) is provided on the oil inlet end of the electro-hydraulic directional valve (3).

4. A hydraulic control structure for a movable fume hood according to claim 1 or 3, characterized in that: The electromagnetic shut-off valve (4) is a manually stacked type.

5. The hydraulic control structure for a movable fume hood according to claim 1, characterized in that: The balance valve (6) is connected to the rodless chamber of the hydraulic cylinder (9) via a cartridge type.

6. The hydraulic control structure for a movable fume hood according to claim 1, characterized in that: The hydraulic cylinder (9) is equipped with a second high-pressure ball valve (1), which is connected to the rodless chamber and the rod chamber of the hydraulic cylinder (9) respectively.

7. The hydraulic control structure for a movable fume hood according to claim 6, characterized in that: A pressure measuring point (8) is provided between the second high-pressure ball valve (1) and the hydraulic cylinder (9).

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