Pneumatic control system of hopper car

Abstract

The utility model discloses a pneumatic control system of a hopper car. The system comprises a control box, a top door operation part, a bottom door operation part, a top door travel switch and a bottom door travel switch, the top door operation part comprises a top door cylinder and is connected with the top door control part; the bottom door operation part comprises a bottom door cylinder and is connected with the bottom door control part; the control box comprises a top door switch and is connected with a top door logic door, and the top door logic door is connected with a top door control part; the bottom door switch is connected with the bottom door logic door, and the bottom door logic door is connected with the bottom door control part; the bottom door travel switch is connected with the top door logic door and the power source, so that the top door switch controls the top door control part to control the opening of the top door cylinder when the bottom door cylinder is completely closed; and the top door travel switch is connected with the bottom door logic door and the power source, so that the bottom door switch controls the bottom door control part to control the opening of the bottom door cylinder when the top door cylinder is completely closed. The interlocking function of the top door and the bottom door is achieved, and the requirement for safe loading and unloading of the hopper car is met.

Description

Technical Field

[0001] The invention relates to the technical field of pneumatic control, and in particular to a pneumatic control system for a hopper car. Background Art

[0002] In order to load and unload goods conveniently and easily, hopper cars are used to load and unload goods. Existing hopper cars have a body, a top door, and a bottom door. When loading goods, the top door is opened to load goods from the upper part of the body, and when unloading goods, the bottom door is opened to unload goods from the bottom of the car. Utility Model Content

[0003] When loading goods, the existing hopper car opens the top door, and the bottom door can be opened when the top door is opened or the bottom door is not completely closed; when unloading goods, the bottom door is opened, and the top door can be opened when the bottom door is opened or the top door is not completely closed; this cannot meet the requirements that the top door of the hopper car is opened when loading goods, the bottom door cannot be opened, and the bottom door is completely closed; it also cannot meet the requirements that the bottom door of the hopper car is opened when unloading goods, the top door cannot be opened, and the top door is completely closed. The existing hopper car also cannot meet the requirements of locking the top door and the bottom door when the power gas source disappears when loading goods.

[0004] In view of the above problems, the present invention is proposed to provide a hopper car pneumatic control system that overcomes the above problems or at least partially solves the above problems.

[0005] An embodiment of the present invention provides a hopper car pneumatic control system, comprising: at least one control box, at least one top door operating unit, at least one bottom door operating unit, at least one top door travel switch, and at least one bottom door travel switch;

[0006] The top door operating unit includes: a top door cylinder, and a top door control unit connected to the top door cylinder;

[0007] The bottom door operating unit includes: a bottom door cylinder, a bottom door control unit connected to the bottom door cylinder;

[0008] The control box includes: a top door switch, a top door logic gate connected to the top door switch, and the top door logic gate is connected to the top door control unit; a bottom door switch, a bottom door logic gate connected to the bottom door switch, and the bottom door logic gate is connected to the bottom door control unit;

[0009] The bottom door travel switch is connected to the top door logic gate and the power source, so that when the bottom door cylinder is fully closed, the top door switch controls the top door control unit to control the top door cylinder to open; the top door travel switch is connected to the bottom door logic gate and the power source, so that when the top door cylinder is fully closed, the bottom door switch controls the bottom door control unit to control the bottom door cylinder to open.

[0010] In an optional embodiment, the top door operating unit further includes a top door one-way valve; the top door one-way valve is connected to the top door cylinder and the top door control unit so that the top door cylinder is locked when there is no power source;

[0011] The bottom door operating part also includes a bottom door one-way valve, which is connected to the bottom door cylinder and the bottom door control part so that the bottom door cylinder is locked when there is no power source.

[0012] In an optional embodiment, the top door operating unit further includes a top door ball valve, and the top door ball valve is connected to the top door cylinder and the top door one-way valve;

[0013] The bottom door operating part also includes a bottom door ball valve, and the bottom door ball valve is connected with the bottom door cylinder and the bottom door one-way valve.

[0014] In an optional embodiment, the top door operating unit includes at least two top door one-way valves, one end of the first top door one-way valve is connected to the extension air inlet of the top door cylinder and one end of the top door ball valve, the other end of the first top door one-way valve is connected to the top door control unit, and one end of the second top door one-way valve is connected to the contraction air inlet of the top door cylinder and the other end of the top door ball valve, so that the extension air inlet and the contraction air inlet are connected when the top door cylinder is locked;

[0015] The bottom door operating part includes at least two bottom door one-way valves, one end of the first bottom door one-way valve is connected to the extension air inlet of the bottom door cylinder and one end of the bottom door ball valve, the other end of the first bottom door one-way valve is connected to the bottom door control part, and one end of the second bottom door one-way valve is connected to the contraction air inlet of the bottom door cylinder and the other end of the bottom door ball valve, so that the extension air inlet and the contraction air inlet are connected when the bottom door cylinder is locked.

[0016] In an optional embodiment, the control box further includes a safety switch, wherein the safety switch is connected to the top door switch and the bottom door switch so that only the top door switch or only the bottom door switch can be operated.

[0017] In an optional embodiment, the control box includes at least two top door logic gates; the top door switch includes a top door opening button and a top door closing button, the inlet of the first top door logic gate is connected to the top door opening button and the bottom door travel switch, and the outlet of the first top door logic gate is connected to the top door operating unit; the inlet of the second top door logic gate is connected to the top door closing button and the bottom door travel switch, and the outlet of the second top door logic gate is connected to the top door operating unit;

[0018] The control box includes at least two bottom door logic gates; the bottom door switch includes a top door opening button and a top door closing button, the inlet of the first bottom door logic gate is connected to the bottom door opening button and the top door travel switch, and the outlet of the first bottom door logic gate is connected to the bottom door operating part; the inlet of the second bottom door logic gate is connected to the bottom door closing button and the top door travel switch, and the outlet of the second bottom door logic gate is connected to the bottom door operating part.

[0019] In an optional embodiment, one end of the top door travel switch is connected to the power source, the other end of the top door travel switch is connected to the bottom door logic gate, and the top door travel switch is installed at the top door closed position so that the top door travel switch is switched according to the top door switch state;

[0020] One end of the bottom door travel switch is connected to the power source, and the other end of the bottom door travel switch is connected to the top door logic gate. The bottom door travel switch is installed at the bottom door closing position so that the bottom door travel switch is switched according to the bottom door switch state.

[0021] An optional embodiment includes at least two control boxes, at least one top-gate shuttle valve, and at least one bottom-gate shuttle valve;

[0022] The top door switches of the first control box and the second control box are connected to the inlet of the top door shuttle valve, and the top door logic gate of the first control box or the top door logic gate of the second control box is connected to the outlet of the top door shuttle valve and the top door control unit;

[0023] The bottom door switches of the first control box and the second control box are connected to the inlet of the bottom door shuttle valve, and the bottom door logic gate of the first control box or the bottom door logic gate of the first control box is connected to the outlet of the bottom door shuttle valve and the bottom door control unit.

[0024] In an optional implementation manner, the top door control unit is a top door five-way valve;

[0025] The power air inlet, extension air outlet, contraction air outlet, extension control port, and contraction control port of the top door five-way valve are respectively connected to the power source, the extension air inlet of the top door cylinder, the contraction air inlet of the top door cylinder, the outlet of the first top door logic gate, and the outlet of the second top door logic gate, so that the top door opening button and the top door closing button control the top door five-way valve to extend and contract the top door cylinder;

[0026] The bottom door control part is a bottom door five-way valve, and the power air inlet, extension air outlet, contraction air outlet, extension control port and contraction control port of the bottom door five-way valve are respectively connected to the power source, the extension air inlet of the bottom door cylinder, the contraction air inlet of the bottom door cylinder, the outlet of the first bottom door logic gate and the outlet of the second bottom door logic gate, so that the bottom door opening button and the bottom door closing button control the bottom door five-way valve to extend and contract the bottom door cylinder.

[0027] An optional implementation manner is characterized in that the power source is compressed air.

[0028] The beneficial effects of the above technical solution provided by the embodiment of the present invention include at least:

[0029] The bottom door operating part and the top door operating part include travel switches; when the top door is opened, if the bottom door is not completely closed, the travel switch of the bottom door operating part controls the top door not to be opened, and the top door is opened only when the bottom door is completely closed under the control of the travel switch of the bottom door operating part; when the bottom door is opened, if the top door is not completely closed, the travel switch of the top door operating part controls the bottom door not to be opened, and the bottom door is opened only when the top door is completely closed under the control of the travel switch of the top door operating part. The top door and the bottom door are interlocked to prevent both from being opened at the same time, which makes loading and unloading impossible.

[0030] Furthermore, the bottom door operating part and the top door operating part include a pilot-operated one-way valve speed control valve. When the system loses power, the pilot-operated one-way valve speed control valve is closed, the cylinder power source of the bottom door operating part and the top door operating part is locked, and the cylinder cannot be extended or retracted, and then the top door and the bottom door cannot be opened or closed, ensuring that the top door and the bottom door are locked.

[0031] Further, the safety switch is connected with the top door switch and the bottom door switch. One hand operates the safety switch and the other hand operates the top door switch. In this way, only the bottom door switch or one of the bottom door switches can be operated, thereby ensuring safe operation.

[0032] Furthermore, the top door operating part and the bottom door operating part both have ball valves, one end of the top door ball valve is arranged on the pipeline between the first top door one-way valve and the extension port of the top door cylinder, and the other end of the top door ball valve is arranged on the pipeline between the second top door one-way valve and the contraction port of the top door cylinder, and the top door can be opened or closed manually by opening the ball valve; the bottom door operating part and the bottom door operating part both have ball valves, one end of the bottom door ball valve is arranged on the pipeline between the first bottom door one-way valve and the extension port of the bottom door cylinder, and the other end of the bottom door ball valve is arranged on the pipeline between the second bottom door one-way valve and the contraction port of the bottom door cylinder, and the bottom door can be opened or closed manually by opening the ball valve.

[0033] The above functions combined meet the needs of hopper truck loading and unloading.

[0034] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description, claims, and drawings.

[0035] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0037] Figure 1 This is a schematic diagram of the structure of the pneumatic control system of the hopper car in the first embodiment of the present invention;

[0038] Figure 2 This is a schematic diagram of the specific structure of the pneumatic control system of the hopper car in the second embodiment of the present invention;

[0039] Figure 3 This is another specific structural schematic diagram of the pneumatic control system of the hopper car in the third embodiment of the present invention;

[0040] Figure 4 Schematic diagram of the specific structure of the five-way valve in the embodiment of the present invention.

[0041] Description of reference numerals:

[0042] 1-power source, 2-top door switch, 3-bottom door switch, 4-top door logic gate, 5-bottom door logic gate, 6-top door control unit, 7-bottom door control unit, 8-top door cylinder, 9-bottom door cylinder, 10-top door travel switch, 11-bottom door travel switch; 12-first safety switch, 13-second safety switch, 14-first top door open button, 15-first top door close button, 16-first bottom door open button, 17-first bottom door close button, 18-second top door open button, 19-second top door close button, 20-second bottom door open button, 21-second bottom door close button, 22-first top door shuttle valve, 23-second top door shuttle valve, 24-first bottom door shuttle valve, 25-second bottom door shuttle valve, 26-first top door Logic gate, 27-second top gate logic gate, 28-first bottom gate logic gate, 29-second bottom gate logic gate, 30-first top gate one-way valve, 31-second top gate one-way valve, 32-first bottom gate one-way valve, 33-second bottom gate one-way valve, 34-top gate ball valve, 35-bottom gate ball valve, 36-top gate one-way valve, 37-bottom gate one-way valve, 38-top gate five-way valve, 39-bottom gate five-way valve, 40-third top gate one-way valve, 41-fourth top gate one-way valve, 42-second top gate ball valve, 43-second top gate cylinder, 44-second top gate travel switch, 45-third bottom gate one-way valve, 46-fourth bottom gate one-way valve, 47-second bottom gate ball valve, 48-second bottom gate cylinder, 49-second bottom door travel switch. DETAILED DESCRIPTION

[0043] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0044] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the 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 invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0045] 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 according to specific circumstances.

[0046] In order to solve the problems existing in the prior art, an embodiment of the present invention provides a pneumatic control system for a hopper car, which can realize the linkage control of the top door and the bottom door, so that when the top door is opened for loading, the bottom door can be completely closed and remain in a closed state; when the bottom door is opened for unloading, the top door can be completely closed and remain in a closed state.

[0047] Embodiment 1

[0048] Embodiment 1 of the present invention provides a hopper car pneumatic control system, the structure of which is shown in FIG. Figure 1 As shown, it includes at least one control box, at least one top door operating part, at least one bottom door operating part, at least one top door travel switch, and at least one bottom door travel switch;

[0049] The top door operating unit includes: a top door cylinder 8, and a top door control unit 6 connected to the top door cylinder 8;

[0050] The bottom door operating unit includes: a bottom door cylinder 9, and a bottom door control unit 7 connected to the bottom door cylinder 9;

[0051] The control box includes: a top door switch 2, a top door logic gate 4 connected to the top door switch 2, and the top door logic gate 4 is connected to a top door control unit 6; a bottom door switch 3, a bottom door logic gate 5 connected to the bottom door switch 3, and the bottom door logic gate 5 is connected to a bottom door control unit 7;

[0052] The bottom door travel switch 11 is connected to the top door logic gate 4 and the power source 1, so that when the bottom door cylinder 9 is fully closed, the top door switch 2 controls the top door control unit 6 to control the top door cylinder 8 to open; the top door travel switch 10 is connected to the bottom door logic gate 5 and the power source 1, so that when the top door cylinder 8 is fully closed, the bottom door switch 3 controls the bottom door control unit 7 to control the bottom door cylinder 9 to open.

[0053] In the above system, one, two or more control boxes may be provided. Figure 1In the example, one is set as an example. In a control box, the number of top door switches and bottom door switches can also be set to one or more. The top door operating part and the top door travel switch can also be set to one, two or more. The number of top door operating parts and top door travel switches can be set according to the number of top doors. One top door can be set with one top door operating part, or more than one top door operating parts can be set. One top door can be set with one top door travel switch, or more than one top door travel switches can be set. The bottom door operating part and the bottom door travel switch can also be set to one, two or more. The number of bottom door operating parts and bottom door travel switches can be set according to the number of bottom doors. One bottom door can be set with one bottom door operating part, or more than one bottom door operating part can be set. One bottom door can be set with one bottom door travel switch, or more than one bottom door travel switches can be set.

[0054] Furthermore, one end of the top door travel switch 10 is connected to the power source 1, and the other end of the top door travel switch 10 is connected to the bottom door logic gate 5. The top door travel switch 10 is installed at the top door closing position, and the top door travel switch 10 is switched according to the top door switch state. In practical applications, optionally, the top door travel switch 10 is installed at the top door closing position, and when the top door is not fully closed, the top door does not press the top door travel switch 10, and the top door travel switch is in a closed state; when the top door is fully closed, the top door presses the top door travel switch 10, so that the top door travel switch 10 is triggered and is in an open state.

[0055] One end of the bottom door travel switch 11 is connected to the power source 1, and the other end of the bottom door travel switch 11 is connected to the top door logic gate 4. The bottom door travel switch 11 is installed at the bottom door closing position so that the bottom door travel switch 11 is switched according to the bottom door switch state. In practical applications, optionally, the bottom door travel switch 11 is installed at the bottom door closing position. When the bottom door is not fully closed, the bottom door does not press the bottom door travel switch 11, and the bottom door travel switch is in a closed state; when the bottom door is fully closed, the bottom door presses the bottom door travel switch 11, and the bottom door travel switch 11 is in an open state.

[0056] Loading process: When the bottom door is completely closed, the bottom door travel switch 11 is in the open state, and the top door switch is open; the top door opening command is sent to the top door control unit 6 through the top door logic gate 4, and the top door control unit 6 extends the top door cylinder 8 according to the top door opening command to drive the top door to open and load. The bottom door opening and closing state is monitored by the bottom door travel switch 11 to ensure that during the loading process, when the top door is in the open state, the bottom door is in the fully closed and locked state.

[0057] Unloading process: When the top door is completely closed, the top door travel switch 10 is in the open state, and the bottom door switch is open; the bottom door opening command is sent to the bottom door control unit 7 through the bottom door logic gate 5, and the bottom door control unit 7 extends the top door cylinder 8 according to the top door opening command to drive the bottom door to open and unload. The top door travel switch 10 monitors the opening and closing state of the top door to ensure that during the unloading process, when the bottom door is in the open state, the top door is in the fully closed and locked state.

[0058] Embodiment 2

[0059] Embodiment 2 of the present invention provides a hopper car pneumatic control system, the structure of which is shown in FIG. Figure 2 As shown, compared with the pneumatic control system provided in Example 1, this system is illustrated by setting two control boxes as an example. When two control boxes are set, the corresponding top door switches in the two control boxes can be connected to the top door logic gate through a shuttle door, and the corresponding bottom door switches can also be connected to the bottom door logic gate through a shuttle door. In addition, in this system, the top door operating part also includes a top door one-way valve 36; the top door one-way valve 36 is connected to the top door cylinder 8 and the top door control part 6 so that the top door cylinder 8 is locked when there is no power source; the bottom door operating part of the system also includes a bottom door one-way valve 37, and the bottom door one-way valve 37 is connected to the bottom door cylinder 9 and the bottom door control part 7 so that the bottom door cylinder 9 is locked when there is no power source.

[0060] When the power source 1 is accidentally cut off and cannot provide power, causing the top door cylinder 8 to lose the power source, the top door one-way valve 36 is closed under the action of the internal spring, and then the top door cylinder 8 connecting pipeline is closed, ensuring that the internal pressure of the top door cylinder 8 remains unchanged so that the state of the top door cylinder 8 will not change due to the gas source being cut off, thereby allowing the top door to be locked when the power source fails.

[0061] When the power source 1 is accidentally cut off and cannot provide power, causing the bottom door cylinder 9 to lose the power source, the bottom door one-way valve 37 is closed under the action of the internal spring, and then the pipeline connected to the bottom door cylinder 9 is closed, ensuring that the internal pressure of the bottom door cylinder 9 remains unchanged so that the state of the bottom door cylinder 9 will not change due to the gas source being cut off, thereby allowing the bottom door to be locked when the power source fails.

[0062] Further, if Figure 2 As shown, the top door operating part of the system also includes a top door ball valve 34, which is connected to the top door cylinder 8, the first top door check valve 30 and the second top door check valve 31; the bottom door operating part of the system also includes a bottom door ball valve 35, which is connected to the bottom door cylinder 9, the first bottom door check valve 32 and the second bottom door check valve 33.

[0063] Optionally, the top door operating unit includes at least two top door check valves, see Figure 2As shown, the top door check valve 36 includes a first top door check valve 30 and a second top door check valve 31, and the first top door check valve 30 and the second top door check valve 31 are respectively connected to the air inlets on both sides of the top door cylinder to keep the air pressure in the cavities on both sides of the cylinder stable so that the top door is locked. In the case of a top door ball valve, one end of the first top door check valve 30 is connected to the extension air inlet of the top door cylinder 8 and one end of the top door ball valve 34, the other end of the first top door check valve 30 is connected to the top door control unit 6, and one end of the second top door check valve 31 is connected to the contraction air inlet of the top door cylinder 8 and the other end of the top door ball valve 34, so that the extension air inlet and the contraction air inlet are connected when the top door cylinder 8 is locked.

[0064] The control port of the first top door check valve 30 is connected to the top door control unit 6, and the control port of the second top door check valve 31 is connected to the top door control unit 6, so that the rodless chamber of the top door cylinder 8 is exhausted when the rod chamber of the top door cylinder 8 is ventilated, and the rod chamber of the top door cylinder 8 is exhausted when the rodless chamber of the top door cylinder 8 is ventilated, and the extension and contraction speed of the top door cylinder 8 can be controlled at the same time. The control port of the first bottom door check valve 32 is connected to the bottom door control unit 7, and the control port of the second bottom door check valve 33 is connected to the bottom door control unit 7, so that the rodless chamber of the bottom door cylinder 9 is exhausted when the rod chamber of the bottom door cylinder 9 is ventilated, and the rod chamber of the bottom door cylinder 9 is exhausted when the rodless chamber of the bottom door cylinder 9 is ventilated, and the extension and contraction speed of the bottom door cylinder 9 can be controlled at the same time.

[0065] Optionally, the bottom door operating unit includes at least two bottom door one-way valves, see Figure 2 As shown, the bottom door one-way valve 37 includes a first bottom door one-way valve 32, one end of which is connected to the extension air inlet of the bottom door cylinder 9 and one end of the bottom door ball valve 35, the other end of the first bottom door one-way valve 32 is connected to the bottom door control unit 7, and one end of the second bottom door one-way valve 33 is connected to the contraction air inlet of the bottom door cylinder 9 and the other end of the bottom door ball valve 35, so that the extension air inlet and the contraction air inlet are connected when the bottom door cylinder 9 is locked.

[0066] After the top door is locked, the top door can also be operated manually. In terms of system structure, the extension air inlet of the top door cylinder 8 is connected to one end of the first top door check valve 30 through a pipeline, and one end of the top door ball valve 34 is connected to the pipeline; the contraction air inlet of the top door cylinder 8 is connected to one end of the second top door check valve 31 through a pipeline, and the other end of the top door ball valve 34 is connected to the pipeline. Operation process: After the top door is locked, the extension and contraction pipelines of the top door cylinder 8 are in a closed state, and the top door ball valve 34 is opened manually. When the top door ball valve 34 is in the punched state, the extension and contraction pipelines of the top door cylinder 8 are in a connected state, and the pressure inside the top door cylinder 8 is in a balanced state, so that the top door cylinder 8 is in a state of free expansion and contraction, ensuring that the top door is in a state that can be freely closed, and the top door can be opened and closed manually.

[0067] The bottom door can also be operated manually after it is locked. In terms of system structure, the expansion air inlet of the bottom door cylinder 9 is connected to one end of the first bottom door check valve 32 through a pipeline, and one end of the bottom door ball valve 35 is connected to the pipeline; the contraction air inlet of the bottom door cylinder 9 is connected to one end of the second bottom door check valve 33 through a pipeline, and the other end of the bottom door ball valve 35 is connected to the pipeline. Operation process: After the bottom door is locked, the expansion and contraction pipelines of the bottom door cylinder 9 are in a closed state, and the bottom door ball valve 35 is opened manually. When the bottom door ball valve 35 is in the punched state, the expansion and contraction pipelines of the bottom door cylinder 9 are in a connected state, and the pressure inside the bottom door cylinder 9 is in a balanced state, so that the bottom door cylinder 9 is in a state of free expansion and contraction, ensuring that the bottom door is in a state that can be freely closed, and the bottom door can be opened and closed manually.

[0068] Optional, such as Figure 2 As shown, the control box further comprises a first safety switch 12, which is connected to the top door switch 2 and the bottom door switch 3 so as to operate only the top door switch 2 or only the bottom door switch 3.

[0069] The pneumatic control system of the hopper car of the embodiment of the present invention can only operate the top door or the bottom door at the same time, but not both at the same time. During operation, one hand presses the first safety switch 12, the first safety switch is turned on, and the other hand operates the top door switch 2; or one hand presses the first safety switch 12, the first safety switch 12 is turned on, and the other hand operates the bottom door switch 3. The first safety switch 12 is connected in series with the top door switch 2 and the bottom door switch 3. When both hands operate the top door switch 2 and the bottom door switch 3 at the same time, the first safety switch 12 is not turned on, and the top door and the bottom door cannot be controlled.

[0070] Furthermore, the control box of the system includes at least two top door logic gates. In this embodiment, the control box adopts two top door logic gates as shown in Figure 2. The top door logic gate 4 includes a first top door logic gate 26 and a second top door logic gate 27. The top door switch includes a first top door opening button 14 and a first top door closing button 15; the inlet of the first top door logic gate 26 is connected to the first top door opening button 14 and the bottom door travel switch 11 through a pipeline, and the outlet of the first top door logic gate 26 is connected to the top door operating part through a pipeline; the inlet of the second top door logic gate 27 is connected to the first top door closing button 15 and the bottom door travel switch 11 through a pipeline, and the outlet of the second top door logic gate 27 is connected to the top door operating part through a pipeline.

[0071] The control box of the system includes at least two bottom gate logic gates. In this embodiment, the control box uses two bottom gate logic gates. Figure 2As shown, the bottom door logic gate 5 includes a first bottom door logic gate 28 and a second bottom door logic gate 29, and the bottom door switch includes a first bottom door opening button 16 and a first bottom door closing button 17; the inlet of the first bottom door logic gate 28 is connected to the first bottom door opening button 16 and the top door travel switch 10 through a pipeline, and the outlet of the first bottom door logic gate 28 is connected to the bottom door operating part through a pipeline; the inlet of the second bottom door logic gate 29 is connected to the first bottom door closing button 17 and the bottom door travel switch 11 through a pipeline, and the outlet of the second bottom door logic gate 29 is connected to the bottom door operating part through a pipeline.

[0072] The top door operation process includes: one hand presses the safety switch and the other hand presses the top door opening button to open the top door; one hand presses the safety switch and the other hand presses the top door closing button to close the top door, further improving the operational safety of the top door switch.

[0073] The bottom door operation process includes: one hand presses the safety switch and the other hand presses the bottom door opening button to open the bottom door; one hand presses the safety switch and the other hand presses the bottom door closing button to close the bottom door, further improving the operational safety of the bottom door switch.

[0074] Furthermore, the system includes at least two control boxes. In this embodiment, two control boxes are used. Figure 2 As shown, the system includes a first control box, a second control box, a first top door shuttle valve 22, a second top door shuttle valve 23, a first bottom door shuttle valve 24, and a second bottom door shuttle valve 25; the first top door opening button 14 of the first control box and the second top door opening button 18 of the second control box are connected to the inlet of the first top door shuttle valve 22, and the outlet of the first top door shuttle valve 22 is connected to the top door control unit 6; the first top door closing button 15 of the first control box and the second top door closing button 19 of the second control box are connected to the inlet of the second top door shuttle valve 23, and the outlet of the second top door shuttle valve 23 is connected to the top door control unit 6.

[0075] The first bottom door opening button 16 of the first control box and the second bottom door opening button 20 of the second control box are connected to the inlet of the first bottom door shuttle valve 24, and the outlet of the first bottom door shuttle valve 24 is connected to the bottom door control unit 7; the first bottom door closing button 17 of the first control box and the second bottom door closing button 21 of the second control box are connected to the inlet of the second bottom door shuttle valve 25, and the outlet of the second bottom door shuttle valve 25 is connected to the bottom door control unit 7.

[0076] The top door is controlled to be opened and closed at either end of the hopper car. The structure of the system is that the top door opening buttons of the first control box and the second control box are connected to the air inlet of the first top door shuttle valve 22, and the air outlet of the first top door shuttle valve 22 is connected to the top door control unit 6 through an air circuit. Operation process: operate one of the top door opening buttons of the first control box and the second control box, and the first top door shuttle valve 22 will pass the top door opening command to the top door control unit 6, thereby controlling the top door to open; the top door closing buttons of the first control box and the second control box are connected to the air inlet of the second top door shuttle valve 23, and the air outlet of the second top door shuttle valve 23 is connected to the top door control unit 6 through an air circuit. When one of the top door closing buttons of the first control box and the second control box is operated, the second top door shuttle valve 23 will pass the top door opening command to the top door control unit 6, thereby controlling the top door to open.

[0077] The bottom door is controlled at either end of the hopper car. The structure of the system: the bottom door opening button of the first control box and the second control box is connected to the air inlet of the first bottom door shuttle valve 24, and the air outlet of the first bottom door shuttle valve 24 is connected to the bottom door control unit 7 through an air circuit. When one of the bottom door opening buttons of the first control box and the second control box is operated, the first bottom door shuttle valve 24 will pass the bottom door opening instruction to the bottom door control unit 7, thereby controlling the bottom door to open; the bottom door closing button of the first control box and the second control box is connected to the air inlet of the second bottom door shuttle valve 25, and the air outlet of the second bottom door shuttle valve 25 is connected to the top door control unit 6 through an air circuit. Operation process: operate one of the bottom door closing buttons of the first control box and the second control box, and the second bottom door shuttle valve 25 will pass the bottom door opening instruction to the bottom door control unit 7, thereby controlling the bottom door to close. Each control box can control the opening and closing of the top door or the bottom door separately, and can realize the control of loading and unloading of the hopper car from both sides.

[0078] Further, the top door control unit 6 specifically adopts a top door five-way valve, and the top door five-way valve is as follows: Figure 4 As shown, the top door five-way valve includes a power air inlet, an extension air outlet, a contraction air outlet, an extension control port, and a contraction control port; the power air inlet, extension air outlet, contraction air outlet, extension control port, and contraction control port of the top door five-way valve are respectively connected to the power source 1, the extension air inlet of the top door cylinder 8, the contraction air inlet of the top door cylinder 8, the outlet of the first top door logic gate 26, and the outlet of the second top door logic gate 27, so that the first top door opening button 14 and the first top door closing button 15 control the top door five-way valve to extend and contract the top door cylinder 8;

[0079] The bottom door control unit 7 specifically adopts a bottom door five-way valve, and the bottom door five-way valve is as follows Figure 4As shown, the bottom door five-way valve includes a power air inlet, an extension air outlet, a contraction air outlet, an extension control port, and a contraction control port; the power air inlet, extension air outlet, contraction air outlet, extension control port, and contraction control port of the bottom door five-way valve are respectively connected to the power source 1, the extension air inlet of the bottom door cylinder 9, the contraction air inlet of the bottom door cylinder 9, the outlet of the first bottom door logic gate 28, and the outlet of the second bottom door logic gate 29, so that the first bottom door opening button 16 and the first bottom door closing button 17 control the bottom door five-way valve to extend and contract the bottom door cylinder 9.

[0080] The control port of the first top door check valve 30 is connected to the contraction outlet of the top door five-way valve, and the control port of the second top door check valve 31 is connected to the extension outlet of the top door five-way valve, so that the rodless chamber of the top door cylinder 8 is exhausted when the rod chamber of the top door cylinder 8 is ventilated, and the rod chamber of the top door cylinder 8 is exhausted when the rodless chamber of the top door cylinder 8 is ventilated, and the extension speed of the top door cylinder 8 can be controlled at the same time. The control port of the first bottom door check valve 32 is connected to the contraction outlet of the bottom door five-way valve, and the control port of the second bottom door check valve 33 is connected to the extension outlet of the bottom door five-way valve, so that the rodless chamber of the bottom door cylinder 9 is exhausted when the rod chamber of the bottom door cylinder 9 is ventilated, and the rod chamber of the bottom door cylinder 9 is exhausted when the rodless chamber of the bottom door cylinder 9 is ventilated, and the extension speed of the bottom door cylinder 9 can be controlled at the same time.

[0081] Specific control process of the top door: when the top door five-way valve 38 receives an opening command, power gas is introduced into the extension control port of the top door five-way valve 38, the extension valve opens, the power gas enters through the power inlet, and is then output through the extension outlet and enters the extension inlet of the top door cylinder 8. The extension of the top door cylinder 8 drives the top door to open; when the top door five-way valve 38 receives a closing command, power gas is introduced into the contraction control port of the top door five-way valve 38, the contraction valve opens, the power gas enters through the power inlet, and is then output through the contraction outlet and enters the contraction inlet of the top door cylinder 8. The extension and contraction of the top door cylinder 8 drives the top door to close.

[0082] The specific control process of the bottom door: when the bottom door five-way valve 39 receives the opening command, the power gas is introduced into the extension control port of the bottom door five-way valve 39, the extension valve opens, the power gas enters through the power inlet, and is output through the extension outlet and enters the extension inlet of the bottom door cylinder 9. The extension of the bottom door cylinder 9 drives the bottom door to open; when the bottom door five-way valve 39 receives the closing command, the power gas is introduced into the contraction control port of the bottom door five-way valve 39, the contraction valve opens, the power gas enters through the power inlet, and is output through the contraction outlet and enters the contraction inlet of the top door cylinder 8. The extension and contraction of the bottom door cylinder 9 drives the bottom door to close.

[0083] Furthermore, the power source is specifically compressed air.

[0084] In this embodiment, a detailed structure of a hopper car pneumatic control system is as follows: Figure 2As shown, one end of the first safety switch 12 of the first control box and the second safety switch 13 of the second control box are connected to compressed air, the other end of the first safety switch 12 of the first control box is connected to one end of the first top door opening button 14, the first top door closing button 15, the first bottom door opening button 16, and the first bottom door closing button 17 of the first control box, the other end of the second safety switch 13 of the second control box is connected to one end of the second top door opening button 18, the second top door closing button 19, the second bottom door opening button 20, and the second bottom door closing button 21 of the second control box, the other end of the first top door opening button 14 and the other end of the second top door opening button 18 are connected to the inlet of the first top door shuttle valve 22, and the other ends of the first top door closing button 15 and the second top door closing button 19 are connected to the second The inlet of the top door shuttle valve 23 is connected, the other end of the first bottom door opening button 16 and the other end of the second bottom door opening button 20 are connected to the inlet of the first bottom door shuttle valve 24, the other end of the first bottom door closing button 17 and the other end of the second bottom door closing button 21 are connected to the inlet of the second bottom door shuttle valve 25; the outlet of the first top door shuttle valve 22 and one end of the bottom door travel switch 11 are connected to the inlet of the first top door logic gate 26, the outlet of the second top door shuttle valve 23 and one end of the bottom door travel switch 11 are connected to the inlet of the second top door logic gate 27, the outlet of the first bottom door shuttle valve 24 and one end of the top door travel switch 10 are connected to the inlet of the first bottom door logic gate 28, and the outlet of the second bottom door shuttle valve 25 and one end of the top door travel switch 10 are connected to the inlet of the second bottom door logic gate 29.

[0085] The outlet of the first top door logic gate 26 is connected to the extension control port of the top door five-way valve 38, the outlet of the second top door logic gate 27 is connected to the contraction control port of the top door five-way valve 38, the outlet of the first bottom door logic gate 28 is connected to the extension control port of the bottom door five-way valve 39, the outlet of the second bottom door logic gate 29 is connected to the contraction control port of the bottom door five-way valve 39, the extension air outlet of the top door five-way valve 38 is connected to one end of the first top door check valve 30, the contraction air outlet of the top door five-way valve 38 is connected to one end of the second top door check valve 31, the extension air outlet of the bottom door five-way valve 39 is connected to one end of the first bottom door check valve 32, and the contraction air outlet of the bottom door five-way valve 39 is connected to one end of the first bottom door check valve 32. The port is connected to one end of the second bottom door one-way valve 33; the other end of the first top door one-way valve 30 is connected to the extension air inlet of the top door cylinder 8 through a pipeline, and the above-mentioned pipeline is connected to one end of the top door ball valve 34; the other end of the second top door one-way valve 31 is connected to the contraction air inlet of the top door cylinder 8 through a pipeline, and the above-mentioned pipeline is connected to the other end of the top door ball valve 34; the other end of the first bottom door one-way valve 32 is connected to the extension air inlet of the bottom door cylinder 9 through a pipeline, and the above-mentioned pipeline is connected to one end of the bottom door ball valve 35; the other end of the second bottom door one-way valve 33 is connected to the contraction air inlet of the bottom door cylinder 9 through a pipeline, and the above-mentioned pipeline is connected to the other end of the bottom door ball valve 35.

[0086] One end of the top door travel switch 10, one end of the bottom door travel switch 11, the power air inlet of the top door five-way valve 38, and the power air inlet of the bottom door five-way valve 39 are connected to compressed air.

[0087] Embodiment 3

[0088] The present invention is based on the above-mentioned pneumatic control system, and the system at least includes two top door operating parts, two bottom door operating parts, two top door travel switches, and two bottom door travel switches. Embodiment 3 of the present invention provides another specific structural example of the above-mentioned pneumatic control system. In this embodiment, two top door operating parts, two bottom door operating parts, two top door travel switches, and two bottom door travel switches are used. Figure 3 As shown, the two top door operating parts of the system respectively control the two top doors; and the two bottom door operating parts respectively control the two bottom doors.

[0089] One end of the first safety switch 12 of the first control box of the system and the second safety switch 13 of the second control box are connected to the power source 1, and the other end of the first safety switch 12 of the first control box is connected to one end of the first top door opening button 14, the first top door closing button 15, the first bottom door opening button 16, and the first bottom door closing button 17; the other end of the second safety switch 13 of the second control box is connected to one end of the second top door opening button 18, the second top door closing button 19, the second bottom door opening button 20, and the second bottom door closing button 21; the other ends of the first top door opening button 14 and the second top door opening button 18 are connected to the inlet of the first top door shuttle valve, the other ends of the first top door closing button 15 and the second top door closing button 19 are connected to the inlet of the second top door shuttle valve 23, the other ends of the first bottom door opening button 16 and the second bottom door opening button 20 are connected to the inlet of the first bottom door shuttle valve 24, and the other ends of the first bottom door closing button 17 and the second bottom door closing button 21 are connected to the inlet of the second bottom door shuttle valve 25.

[0090] One end of the top door travel switch 10 is connected to the power source 1, and the other end of the top door travel switch 10 is connected to one end of the second top door travel switch 44; one end of the bottom door travel switch 11 is connected to the power source 1, and the other end of the bottom door travel switch 11 is connected to one end of the second bottom door travel switch 49. The top door travel switch 10 and the second top door travel switch 44 are respectively arranged at the closed position of the two top doors, and respectively sense the switch states of the two top doors; the bottom door travel switch 11 and the second bottom door travel switch 49 are respectively arranged at the closed position of the two bottom doors, and respectively sense the switch states of the two bottom doors.

[0091] The other end of the second bottom door travel switch 49 and the outlet of the first top door shuttle valve 22 are connected to the inlet of the first top door logic gate 26, the other end of the second bottom door travel switch 49 and the outlet of the second top door shuttle valve 23 are connected to the inlet of the second top door logic gate 27; the other end of the second top door travel switch 44 and the outlet of the first bottom door shuttle valve 24 are connected to the inlet of the first bottom door logic gate 28, the other end of the second top door travel switch 44 and the outlet of the second bottom door shuttle valve 25 are connected to the inlet of the second bottom door logic gate 29. The logic gate is an "AND" logic gate.

[0092] The outlet of the first top gate logic gate 26 and the outlet of the second top gate logic gate 27 are respectively connected to the extension control port and the contraction control port of the top gate five-way valve 38; the outlet of the first bottom gate logic gate 28 and the outlet of the second bottom gate logic gate 29 are respectively connected to the extension control port and the contraction control port of the bottom gate five-way valve 39.

[0093] The other ends of the first top door check valve 30 and the third top door check valve 40 are connected by a pipeline, and the expansion outlet of the top door five-way valve 38 is connected to the above pipeline; the other ends of the second top door check valve 31 and the fourth top door check valve 41 are connected by a pipeline, and the contraction outlet of the top door five-way valve 38 is connected to the above pipeline. The other ends of the first bottom door check valve 32 and the third bottom door check valve 45 are connected by a pipeline, and the expansion outlet of the bottom door five-way valve 39 is connected to the above pipeline; the other ends of the second bottom door check valve 33 and the fourth bottom door check valve 46 are connected by a pipeline, and the contraction outlet of the bottom door five-way valve 39 is connected to the above pipeline.

[0094] The control ports of the first top door one-way valve 30 and the third top door one-way valve 40 are connected to the contraction outlet of the top door five-way valve, and the control ports of the second top door one-way valve 31 and the fourth top door one-way valve 41 are connected to the extension outlet of the top door five-way valve, so that the rodless chamber of the top door cylinder 8 can be exhausted when the rod chamber of the top door cylinder 8 is ventilated, and the rod chamber of the top door cylinder 8 can be exhausted when the rodless chamber of the top door cylinder 8 is ventilated, and at the same time, the extension and retraction speed of the top door cylinder 8 can be controlled. The control ports of the first bottom door one-way valve 32 and the third bottom door one-way valve 45 are connected to the contraction outlet of the bottom door five-way valve, while the control ports of the second bottom door one-way valve 33 and the fourth bottom door one-way valve 46 are connected to the extension outlet of the bottom door five-way valve, so that the rodless chamber of the bottom door cylinder 9 can be exhausted when the rod chamber of the bottom door cylinder 9 is ventilated, and the rod chamber of the bottom door cylinder 9 can be exhausted when the rodless chamber of the bottom door cylinder 9 is ventilated, and at the same time, the extension and retraction speed of the bottom door cylinder 9 can be controlled.

[0095] In the present invention, the understanding of the top door closing position is that the top door closing position is a position where the top door closing can be sensed; and the understanding of the bottom door closing position is that the bottom door closing position is a position where the bottom door closing can be sensed.

[0096] The pneumatic control system of the hopper car of the present invention has two control boxes respectively installed on both sides of the car body of the hopper car, so that workers can control the opening or closing of the bottom door and the top door on either side of the car body. Each control box is provided with a safety button, which needs to be operated with both hands. The safety button must be pressed first, and then other buttons are pressed before the cylinder can be activated to prevent workers from operating it incorrectly. The top door and the bottom door are installed with travel switches, and the bottom door and the top door can be interlocked. When the bottom door is closed, the top door can be opened to load goods; or after the top door is closed, the bottom door can be opened to unload goods. The top door operating part and the bottom door operating part are provided with a one-way valve, and the cylinder can be locked in the event of an accidental gas failure. The top door operating part and the bottom door operating part are provided with a ball valve, and the cylinder can also be manually actuated when there is no air source. The requirements for safe loading and unloading of hopper cars are met.

[0097] It should be understood that the specific order or hierarchy of steps in the disclosed process is an example of an exemplary method. Based on design preferences, it should be understood that the specific order or hierarchy of steps in the process can be rearranged without departing from the scope of protection of the present disclosure. The attached method claims present the elements of the various steps in an exemplary order and are not intended to be limited to the specific order or hierarchy described.

[0098] In the above detailed description, various features are grouped together in a single embodiment to simplify the disclosure. This method of disclosure should not be interpreted as reflecting an intention that the embodiments of the claimed subject matter require more features than are clearly stated in each claim. On the contrary, as reflected in the appended claims, the invention is in a state of having less than all the features of the disclosed individual embodiments. Therefore, the appended claims are hereby expressly incorporated into the detailed description, with each claim standing on its own as a separate preferred embodiment of the invention.

[0099] The above description includes examples of one or more embodiments. Of course, it is impossible to describe all possible combinations of components or methods for the purpose of describing the above embodiments, but it should be recognized by those skilled in the art that the various embodiments may be further combined and arranged. Therefore, the embodiments described herein are intended to cover all such changes, modifications and variations that fall within the scope of protection of the appended claims. In addition, with respect to the term "comprising" used in the specification or claims, the word is covered in a manner similar to the term "including", just as "including," is explained as a transitional word in the claims. In addition, any term "or" used in the specification of the claims is intended to mean "non-exclusive or".

Claims

1. A hopper car pneumatic control system, characterized in that: include: At least one control box, at least one top door operating unit, at least one bottom door operating unit, at least one top door travel switch, at least one bottom door travel switch; The top door operating unit includes: a top door cylinder, and a top door control unit connected to the top door cylinder; The bottom door operating unit includes: a bottom door cylinder, a bottom door control unit connected to the bottom door cylinder; The control box includes: a top door switch, a top door logic gate connected to the top door switch, and the top door logic gate is connected to the top door control unit; a bottom door switch, a bottom door logic gate connected to the bottom door switch, and the bottom door logic gate is connected to the bottom door control unit; The bottom door travel switch is connected to the top door logic gate and the power source, so that when the bottom door cylinder is fully closed, the top door switch controls the top door control unit to control the top door cylinder to open; the top door travel switch is connected to the bottom door logic gate and the power source, so that when the top door cylinder is fully closed, the bottom door switch controls the bottom door control unit to control the bottom door cylinder to open.

2. The system according to claim 1, characterized in that The top door operating unit also includes a top door one-way valve; the top door one-way valve is connected to the top door cylinder and the top door control unit so that the top door cylinder is locked when there is no power source; The bottom door operating part also includes a bottom door one-way valve, which is connected to the bottom door cylinder and the bottom door control part so that the bottom door cylinder is locked when there is no power source.

3. The system according to claim 2, characterized in that The top door operating part also includes a top door ball valve, which is connected to the top door cylinder and the top door one-way valve; The bottom door operating part also includes a bottom door ball valve, and the bottom door ball valve is connected with the bottom door cylinder and the bottom door one-way valve.

4. The system according to claim 3, characterized in that The top door operating part includes at least two top door one-way valves, one end of the first top door one-way valve is connected to the extension air inlet of the top door cylinder and one end of the top door ball valve, the other end of the first top door one-way valve is connected to the top door control part, and one end of the second top door one-way valve is connected to the contraction air inlet of the top door cylinder and the other end of the top door ball valve, so that the extension air inlet and the contraction air inlet are connected when the top door cylinder is locked; The bottom door operating part includes at least two bottom door one-way valves, one end of the first bottom door one-way valve is connected to the extension air inlet of the bottom door cylinder and one end of the bottom door ball valve, the other end of the first bottom door one-way valve is connected to the bottom door control part, and one end of the second bottom door one-way valve is connected to the contraction air inlet of the bottom door cylinder and the other end of the bottom door ball valve, so that the extension air inlet and the contraction air inlet are connected when the bottom door cylinder is locked.

5. The system according to claim 3, characterized in that The control box also includes a safety switch, which is connected to the top door switch and the bottom door switch so that only the top door switch or only the bottom door switch can be operated.

6. The system according to claim 5, characterized in that The control box includes at least two top door logic gates; the top door switch includes a top door opening button and a top door closing button, the inlet of the first top door logic gate is connected to the top door opening button and the bottom door travel switch, and the outlet of the first top door logic gate is connected to the top door operating part; the inlet of the second top door logic gate is connected to the top door closing button and the bottom door travel switch, and the outlet of the second top door logic gate is connected to the top door operating part; The control box includes at least two bottom door logic gates; the bottom door switch includes a top door opening button and a top door closing button, the inlet of the first bottom door logic gate is connected to the bottom door opening button and the top door travel switch, and the outlet of the first bottom door logic gate is connected to the bottom door operating part; the inlet of the second bottom door logic gate is connected to the bottom door closing button and the top door travel switch, and the outlet of the second bottom door logic gate is connected to the bottom door operating part.

7. The system according to claim 1, characterized in that One end of the top door travel switch is connected to the power source, and the other end of the top door travel switch is connected to the bottom door logic gate. The top door travel switch is installed at the top door closing position so that the top door travel switch is switched according to the top door switch state; One end of the bottom door travel switch is connected to the power source, and the other end of the bottom door travel switch is connected to the top door logic gate. The bottom door travel switch is installed at the bottom door closing position so that the bottom door travel switch is switched according to the bottom door switch state.

8. The system of claim 1, wherein: It includes at least two control boxes, at least one top-gate shuttle valve, and at least one bottom-gate shuttle valve; The top door switches of the first control box and the second control box are connected to the inlet of the top door shuttle valve, and the top door logic gate of the first control box or the top door logic gate of the second control box is connected to the outlet of the top door shuttle valve and the top door control unit; The bottom door switches of the first control box and the second control box are connected to the inlet of the bottom door shuttle valve, and the bottom door logic gate of the first control box or the bottom door logic gate of the first control box is connected to the outlet of the bottom door shuttle valve and the bottom door control unit.

9. The system according to claim 6, characterized in that The top door control part is a top door five-way valve; The power air inlet, extension air outlet, contraction air outlet, extension control port, and contraction control port of the top door five-way valve are respectively connected to the power source, the extension air inlet of the top door cylinder, the contraction air inlet of the top door cylinder, the outlet of the first top door logic gate, and the outlet of the second top door logic gate, so that the top door opening button and the top door closing button control the top door five-way valve to extend and contract the top door cylinder; The bottom door control part is a bottom door five-way valve, and the power air inlet, extension air outlet, contraction air outlet, extension control port and contraction control port of the bottom door five-way valve are respectively connected to the power source, the extension air inlet of the bottom door cylinder, the contraction air inlet of the bottom door cylinder, the outlet of the first bottom door logic gate and the outlet of the second bottom door logic gate, so that the bottom door opening button and the bottom door closing button control the bottom door five-way valve to extend and contract the bottom door cylinder.

10. The system according to claim 9, characterized in that The power source is compressed air.

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