A hydraulic closing system for the gate of the slag outlet of a screw conveyor

Abstract

The present invention provides a hydraulic closing system for a gate at a slag outlet of a screw machine, comprising an accumulator and a valve group, and a hydraulic cylinder for controlling the gate; the accumulator is connected to the valve group through a pipeline, the valve group is used to control the pressure oil in the accumulator to enter the hydraulic cylinder, the valve group is connected to the rod chamber of the hydraulic cylinder through a pipeline, a three-position ball valve is also provided on the connecting pipeline between the valve group and the hydraulic cylinder, the rodless chamber of the hydraulic cylinder is connected to the oil outlet pipeline, a hydraulically controlled one-way valve is provided on the oil outlet pipeline, the control end of the hydraulically controlled one-way valve is connected to the control pipeline, and the other end of the control pipeline is connected to the connecting pipeline between the three-position ball valve and the rod chamber. The hydraulic closing system for the gate at the slag outlet of the screw machine described in the present invention does not require the staff to manually control the gate to close in emergency, and will automatically shut down and close the gate when methane and harmful gases are detected, thereby improving work efficiency and reducing safety hazards during construction.

Description

Technical Field

[0001] The invention belongs to the technical field of hydraulic equipment, and in particular relates to a hydraulic closing system for a slag outlet gate of a screw machine. Background Art

[0002] At present, the slag outlet of the spiral machine of the full-section tunnel boring machine is mostly closed manually. When the spiral machine is unearthed, methane and harmful gases will be produced. When the sensor detects methane and harmful gases and issues an alarm, the staff will turn the emergency ball valve to close the spiral machine gate to prevent the spread of methane and harmful gases. However, the operation may be untimely to a large extent, and a large amount of methane and harmful gases will flow into the tunnel, causing harm to the human body and affecting the construction progress. In addition, due to poor ventilation in the tunnel, methane and harmful gases are slowly dissipated, which can easily cause explosions and fires, posing great safety hazards to the staff. Summary of the invention

[0003] In view of this, the present invention aims to propose a hydraulic closing system for a screw machine slag outlet gate to solve the problem that the existing screw machine slag outlet is closed manually, which easily causes methane gas diffusion and endangers the life safety of workers.

[0004] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0005] A hydraulic closing system for a gate at a slag outlet of a screw conveyor, comprising an accumulator and a valve group, and a hydraulic cylinder for controlling the gate;

[0006] The accumulator is connected to a valve group through a pipeline, and the valve group is used to control the pressure oil in the accumulator to enter the hydraulic cylinder. The valve group is connected to the rod chamber of the hydraulic cylinder through a pipeline. A three-position ball valve is also provided on the connecting pipeline between the valve group and the hydraulic cylinder. The rodless chamber of the hydraulic cylinder is connected to an oil outlet pipeline, and a hydraulically controlled one-way valve is provided on the oil outlet pipeline. The control end of the hydraulically controlled one-way valve is connected to a control pipeline, and the other end of the control pipeline is connected to the connecting pipeline between the three-position ball valve and the rod chamber.

[0007] Further, the valve group includes a first reversing valve and a second reversing valve, the first reversing valve is a two-position three-way electromagnetic reversing valve, the first reversing valve includes two working positions, one of which is connected to the accumulator through a pipeline, and the other working position is connected to the oil tank through a pipeline;

[0008] The second reversing valve is a hydraulic reversing valve. The two working positions of the first reversing valve are connected to the hydraulic control end of the hydraulic reversing valve through the same pipeline. The second reversing valve includes two working positions, one of which is connected to the accumulator through a pipeline, and the other working position is connected to the oil tank through a pipeline. The two working positions of the second reversing valve are connected to the rod chamber of the hydraulic cylinder through the same pipeline.

[0009] Furthermore, there are two accumulators.

[0010] Furthermore, the accumulator is also connected to the oil tank via a relief valve.

[0011] Furthermore, the accumulator is also connected to the oil tank via a pressure relief ball valve.

[0012] Furthermore, the pressure relief ball valve and the overflow valve are arranged in parallel.

[0013] Furthermore, a one-way valve is provided on the connecting pipe between the three-position ball valve and the rod chamber.

[0014] Furthermore, a high-pressure ball valve is also provided on the connecting pipeline between the three-position ball valve and the rod chamber.

[0015] Furthermore, one end of the control pipeline is connected to the control end of the hydraulically controlled one-way valve, and the other end is connected to the connecting pipeline between the one-way valve and the three-position ball valve.

[0016] Furthermore, the oil outlet pipeline is connected to the oil tank.

[0017] Compared with the prior art, the hydraulic closing system for the slag outlet gate of the screw conveyor of the present invention has the following advantages:

[0018] The hydraulic closing system for the gate at the slag outlet of the screw machine described in the present invention does not require the staff to manually control the gate for emergency closing. When methane and harmful gases are detected, the system will automatically shut down and close the gate, thereby improving work efficiency and reducing safety hazards during construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0020] Figure 1 This is a schematic diagram of the hydraulic closing system of the screw conveyor slag outlet gate according to an embodiment of the present invention.

[0021] Description of reference numerals:

[0022] 1-first reversing valve; 2-second reversing valve; 3-three-position ball valve; 4-check valve; 5-high-pressure ball valve; 6-hydraulic check valve; 7-accumulator; 8-pressure relief ball valve; 9-overflow valve. DETAILED DESCRIPTION

[0023] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0024] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0026] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0027] like Figure 1 As shown, a hydraulic closing system for a gate of a slag outlet of a screw conveyor includes an accumulator 7 and a valve group, and a hydraulic cylinder for controlling the gate;

[0028] The accumulator 7 is connected to a valve group through a pipeline, and the valve group is used to control the pressure oil in the accumulator 7 to enter the hydraulic cylinder. The valve group is connected to the rod chamber of the hydraulic cylinder through a pipeline. A three-position ball valve 3 is also provided on the connecting pipeline between the valve group and the hydraulic cylinder. The rodless chamber of the hydraulic cylinder is connected to an oil outlet pipeline, and a hydraulically controlled one-way valve 4 is provided on the oil outlet pipeline. The control end of the hydraulically controlled one-way valve 4 is connected to a control pipeline, and the other end of the control pipeline is connected to the connecting pipeline between the three-position ball valve 3 and the rod chamber.

[0029] The valve group includes a first reversing valve 1 and a second reversing valve 2. The first reversing valve 1 is a two-position three-way electromagnetic reversing valve. The first reversing valve 1 includes two working positions, one of which is connected to the accumulator 7 through a pipeline, and the other is connected to the oil tank through a pipeline.

[0030] The second reversing valve 2 is a hydraulic reversing valve. The two working positions of the first reversing valve 1 are connected to the hydraulic control end of the hydraulic reversing valve through the same pipeline. The second reversing valve 2 includes two working positions, one of which is connected to the accumulator 7 through a pipeline, and the other working position is connected to the oil tank through a pipeline. The two working positions of the second reversing valve 2 are connected to the rod chamber of the hydraulic cylinder through the same pipeline.

[0031] There are two accumulators 7. The purpose of the two accumulators 7 is to ensure that the gate is fully closed. During normal operation, the accumulators 7 are filled with oil pressure to prevent emergencies.

[0032] The accumulator 7 is also connected to the oil tank through the relief valve 9. The accumulator 7 is also connected to the oil tank through the pressure relief ball valve 8. The pressure relief ball valve 8 and the relief valve 9 are arranged in parallel. When maintaining the system, for safety reasons, it is necessary to release the pressure before maintenance to prevent danger caused by excessive pressure. The pressure relief ball valve 8 is opened and the high-pressure ball valve 5 is closed to prevent the pressure oil from entering the oil cylinder under the action of the accumulator 7, so as to ensure maintenance in a safe environment. The relief valve 9 is mainly used to prevent safety hazards caused by excessive system pressure.

[0033] A one-way valve 4 is also provided on the connecting pipe between the three-position ball valve 3 and the rod chamber. A high-pressure ball valve 5 is also provided on the connecting pipe between the three-position ball valve 3 and the rod chamber.

[0034] One end of the control pipeline is connected to the control end of the hydraulically controlled one-way valve 4, and the other end is connected to the connecting pipeline between the one-way valve 4 and the three-position ball valve 3. The oil outlet pipeline is connected to the oil tank.

[0035] Working principle:

[0036] like Figure 1 As shown, during normal use, the first reversing valve 1 is in an energized state, and a port and a port form a passage. The hydraulic oil enters the hydraulic control end of the hydraulic reversing valve through the c port, causing the valve core of the hydraulic control reversing valve to move to the right, so that the d port and the f port of the hydraulic control reversing valve are connected.

[0037] When the detection device detects methane or harmful gas, the electrical program system controls the power to be cut off, the first reversing valve 1 is powered off, port a and port c form a passage, the hydraulically controlled reversing valve moves to the left due to the spring force, and the pilot oil at the hydraulic control end of the hydraulically controlled reversing valve returns to the oil tank through ports a and c of the first reversing valve 1, so that port e is connected to port f, and the pressure oil in the accumulator 7 passes through the hydraulically controlled reversing valve and the three-position ball valve 3 into the rod chamber of the oil cylinder. The pressure oil will separate a path of pilot oil to open the hydraulically controlled check valve 4, so that the rodless chamber of the oil cylinder can return oil smoothly, and the gate will close automatically.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A hydraulic closing system for the slag outlet gate of a screw conveyor, characterized in that: The invention comprises an accumulator (7), a valve group, and a hydraulic cylinder for controlling a gate; the accumulator (7) is connected to the valve group through a pipeline, the valve group is used to control the pressure oil in the accumulator (7) to enter the hydraulic cylinder, the valve group is connected to the rod chamber of the hydraulic cylinder through a pipeline, a three-position ball valve (3) is also provided on the connecting pipeline between the valve group and the hydraulic cylinder, the rodless chamber of the hydraulic cylinder is connected to an oil outlet pipeline, a hydraulically controlled one-way valve (6) is provided on the oil outlet pipeline, the control end of the hydraulically controlled one-way valve (6) is connected to a control pipeline, and the other end of the control pipeline is connected to the connecting pipeline between the three-position ball valve (3) and the rod chamber.

2. The hydraulic closing system for the slag outlet gate of the screw conveyor according to claim 1 is characterized in that: The valve group comprises a first reversing valve (1) and a second reversing valve (2); the first reversing valve (1) is a two-position three-way electromagnetic reversing valve; the first reversing valve (1) comprises two working positions, one of which is connected to an accumulator (7) via a pipeline, and the other working position is connected to an oil tank via a pipeline; the second reversing valve (2) is a hydraulic reversing valve; the two working positions of the first reversing valve (1) are connected to a hydraulic control end of the hydraulic reversing valve via a same pipeline; the second reversing valve (2) comprises two working positions, one of which is connected to an accumulator (7) via a pipeline, and the other working position is connected to an oil tank via a pipeline; the two working positions of the second reversing valve (2) are connected to a rod chamber of the hydraulic cylinder via a same pipeline.

3. The hydraulic closing system for the slag outlet gate of a screw conveyor according to claim 1 is characterized in that: There are two energy accumulators (7).

4. The hydraulic closing system for the slag outlet gate of a screw conveyor according to claim 1 is characterized in that: The accumulator (7) is also connected to the oil tank via a relief valve (9).

5. The hydraulic closing system for the slag outlet gate of the screw conveyor according to claim 4 is characterized in that: The accumulator (7) is also connected to the oil tank via a pressure relief ball valve (8).

6. The hydraulic closing system for the slag outlet gate of the screw conveyor according to claim 5 is characterized in that: The pressure relief ball valve (8) and the overflow valve (9) are arranged in parallel.

7. The hydraulic closing system for the slag outlet gate of a screw conveyor according to claim 1 is characterized in that: A one-way valve (4) is also provided on the connecting pipeline between the three-position ball valve (3) and the rod chamber.

8. The hydraulic closing system for the slag outlet gate of a screw conveyor according to claim 1 is characterized in that: A high-pressure ball valve (5) is also provided on the connecting pipeline between the three-position ball valve (3) and the rod chamber.

9. The hydraulic closing system for the slag outlet gate of a screw conveyor according to claim 7, characterized in that: One end of the control pipeline is connected to the control end of the hydraulically controlled one-way valve (6), and the other end is connected to the connecting pipeline between the one-way valve (4) and the three-position ball valve (3).

10. The hydraulic closing system for the slag outlet gate of a screw conveyor according to claim 1, characterized in that: The oil outlet pipeline is connected to the oil tank.

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