Air supply system and crane

Abstract

This utility model relates to the field of crane technology and discloses an air supply system and a crane. The air supply system includes a circuit protection valve, an air pump, and a check valve. The air outlet of the air pump is connected to the air inlet of the circuit protection valve. The air pump includes a first air pump and a second air pump arranged in parallel. The first air pump is used to connect to an engine, and the second air pump is used to connect to an electric motor. The check valve includes a first check valve and a second check valve. The first check valve is located between the first air pump and the circuit protection valve to prevent gas from flowing back to the first air pump. The second check valve is located between the second air pump and the circuit protection valve to prevent gas from flowing back to the second air pump. This utility model can meet the air demand of the system in different modes.

Description

Technical Field

[0001] This utility model relates to the field of crane technology, specifically to a gas supply system and a crane. Background Technology

[0002] Traditional wheeled cranes are fuel-powered, using an engine-driven air pump to supply air to the braking system and other systems of the crane.

[0003] Hybrid cranes have emerged in related technologies. When operating in pure oil mode and hybrid mode, the engine is working and the air pump driven by the engine can meet the air demand of various systems. However, in pure electric mode, the engine is not working normally and the air pump cannot meet the air demand of the system. Utility Model Content

[0004] In view of this, the present invention provides an air supply system and a crane to solve the problem that engine-driven air pumps cannot meet the air demand.

[0005] In a first aspect, this utility model provides an air supply system, including a circuit protection valve, an air pump, and a one-way valve. The air outlet of the air pump is connected to the air inlet of the circuit protection valve. The air pump includes a first air pump and a second air pump arranged in parallel. The first air pump is used to connect to an engine, and the second air pump is used to connect to an electric motor. The one-way valve includes a first one-way valve and a second one-way valve. The first one-way valve is disposed between the first air pump and the circuit protection valve to prevent gas from flowing back to the first air pump. The second one-way valve is disposed between the second air pump and the circuit protection valve to prevent gas from flowing back to the second air pump.

[0006] Beneficial effects: The air supply system supplies air to different systems through a loop protection valve. By setting up a first air pump and a second air pump, in pure oil mode, the first air pump is responsible for air supply, and the second air pump is normally not working. In pure electric mode, the second air pump is responsible for air supply, and the first air pump is normally not working. In hybrid mode, the first and second air pumps supply air together. Thus, the air demand of the system can be met in different modes. The one-way valve can avoid mutual interference between the first and second air pumps, making the operation of the first and second air pumps more stable and improving the stability of the air supply.

[0007] In one alternative implementation, the number of the second air pumps is at least two, and multiple second air pumps are connected in parallel.

[0008] Beneficial effects: Multiple secondary air pumps can serve as redundancy backups, improving the reliability of the air supply system. Furthermore, multiple secondary air pumps can reduce the operating load of a single secondary air pump, reducing the risk of overheating and shutdown.

[0009] In one alternative implementation, a plurality of second air pumps are connected in parallel with each other, and then connected in parallel with the first air pump.

[0010] Beneficial effects: Multiple air pumps working in parallel can meet greater air volume requirements. By adopting a staged parallel connection, it helps to reduce the flow resistance at the junction of the air supply system, making the air flow smoother when multiple air pumps work at the same time, and improving the air supply efficiency of the air supply system.

[0011] In one optional embodiment, the number of the second air pumps is two, and the air supply system further includes a first tee connector and a second tee connector. The two second air pumps are connected to the first tee connector via pipelines, the first tee connector and the first air pump are connected to the second tee connector via pipelines, and the second tee connector is connected to the circuit protection valve via pipelines.

[0012] Beneficial effect: The parallel design helps to further reduce the flow resistance of the gas supply system at the junction.

[0013] In one alternative embodiment, a condenser and a dryer are further included, the condenser and the dryer being connected between the air pump and the circuit protection valve, with the dryer located downstream of the condenser.

[0014] Beneficial effects: The condenser can separate oil mist and moisture from the gas, and the dryer can further remove residual oil mist and moisture from the gas, ensuring that the gas supply system can supply clean gas to downstream systems.

[0015] In one alternative embodiment, a gas storage tank is also included, which is connected to the dryer.

[0016] Beneficial effects: Part of the dried gas is stored in the gas storage tank. On the one hand, the gas storage tank can smooth out pressure fluctuations in the gas supply system, making the output gas pressure of the gas supply system more stable. On the other hand, the gas storage tank can also play a backwashing role. When the expanded compressed air flows through the dryer, it will carry away the moisture remaining on the surface of the desiccant and discharge it from the outlet of the dryer through the channel and exhaust valve, thereby keeping the dryer clean.

[0017] In one alternative implementation, a controller is further included, which is communicatively connected to the air pump and is used to control the start and stop of the air pump.

[0018] Beneficial effects: The controller can flexibly switch the start and stop of the first air pump and the second air pump according to the preset control logic to meet the air demand in different modes such as hybrid, pure oil and pure electric.

[0019] In an optional implementation, a pressure sensor is also included, which is disposed at the air inlet of the brake master cylinder and is communicatively connected to the controller.

[0020] Beneficial effects: The pressure sensor can detect the air pressure output by the air supply system, which helps to form feedback control with the controller, thereby better regulating the air pressure supply.

[0021] In one optional implementation, the circuit protection valve is a four-circuit protection valve.

[0022] Beneficial effects: The four-circuit protection valve supplies gas to different downstream systems through four independent gas outlets, which can avoid mutual interference between the systems and improve the reliability of the gas supply system.

[0023] Secondly, this utility model also provides a crane, including the air supply system provided by this utility model.

[0024] Beneficial effects: The crane includes the air supply system provided by this utility model, and therefore has the corresponding beneficial effects brought about by the air supply system, which will not be elaborated here. Attached Figure Description

[0025] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of a gas supply system according to an embodiment of the present utility model.

[0027] Explanation of reference numerals in the attached figures: 1. Circuit protection valve; 201. First air pump; 202. Second air pump; 301. First check valve; 302. Second check valve; 303. First tee connector; 304. Second tee connector; 4. Condenser; 5. Dryer; 6. Air tank; 7. Controller; 8. Pressure sensor; 9. Master brake cylinder. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0029] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "a," "an," and "comprising" as used herein may also mean including the plural forms. The terms "comprising," "including," and "having" are inclusive and therefore indicate the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof.

[0030] Although terms such as "first," "second," etc., may be used in this document to describe multiple elements, components, regions, layers, and / or sections, these elements, components, regions, layers, and / or sections should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or section from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Furthermore, in the description of this utility model, unless otherwise expressly specified and limited, the terms "set up" and "connected" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art will understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "end," "length," "inner," "outer," etc. Such spatial relative terms are intended to include different orientations of the mechanism in use or operation, in addition to those depicted in the figure. For example, if the mechanism in the figure is flipped, then an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The mechanism may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0032] In related technologies, hybrid cranes can operate in pure electric, pure oil, and hybrid modes. In pure oil and hybrid modes, the engine is working and the engine-driven air pump can supply air to the braking system. However, in pure electric mode, the engine is not working normally, and the engine-driven air pump is also not working. The compressed gas stored in the air supply system cannot meet the high-frequency and high-capacity air demand of the crane (such as frequent braking), resulting in problems such as poor braking effect.

[0033] If the engine is started to drive the air pump, it will cause the engine to start and stop frequently in pure electric mode, reducing the engine's lifespan.

[0034] The following is combined with Figure 1 The following describes embodiments of the present invention.

[0035] Reference Figure 1 According to an embodiment of the present invention, an air supply system is provided, including a circuit protection valve 1, an air pump, and a check valve. The outlet of the air pump is connected to the inlet of the circuit protection valve 1. The air pump includes a first air pump 201 and a second air pump 202 arranged in parallel. The first air pump 201 is used to connect to an engine, and the second air pump 202 is used to connect to an electric motor. The check valve includes a first check valve 301 and a second check valve 302. The first check valve 301 is disposed between the first air pump 201 and the circuit protection valve 1 to prevent gas from flowing back to the first air pump 201. The second check valve 302 is disposed between the second air pump 202 and the circuit protection valve 1 to prevent gas from flowing back to the second air pump 202.

[0036] The air supply system supplies air to different systems through the circuit protection valve 1. In pure oil mode, the engine starts and the first air pump 201 is responsible for supplying air, while the second air pump 202 is normally not working. In pure electric mode, the electric motor starts and the second air pump 202 is responsible for supplying air, while the first air pump 201 is normally not working. In hybrid mode, the engine and the electric motor start together and the first air pump 201 and the second air pump 202 jointly supply air.

[0037] Therefore, the gas supply system can ensure that the air pump is working in different modes, so as to meet the gas demand of different modes of the system.

[0038] Furthermore, the check valve can prevent mutual interference between the first air pump 201 and the second air pump 202. For example, in pure oil mode, the second check valve 302 can prevent the gas generated by the first air pump 201 from flowing along the pipeline to the second air pump 202. In pure electric mode, the first check valve 301 can prevent the gas generated by the second air pump 202 from flowing along the pipeline to the first air pump 201. In hybrid mode, if there is a pressure difference between the first air pump 201 and the second air pump 202, the check valve can prevent the gas from flowing from the high-pressure side air pump to the low-pressure side air pump along the pipeline, making the operation of the first air pump 201 and the second air pump 202 more stable and improving the stability of the air supply.

[0039] It should be noted that in pure oil mode, the electric motor can also be started in an emergency to make the second air pump 202 work. In pure electric mode, the engine can also be started in an emergency to make the first air pump 201 work. In other words, the first air pump 201 and the second air pump 202 can serve as emergency backups for each other to ensure that the air supply system can operate stably under various conditions.

[0040] Optionally, in some embodiments, the number of second air pumps 202 is at least two, and multiple second air pumps 202 are connected in parallel. Multiple second air pumps 202 can serve as redundancy backup, improving the reliability of the air supply system. Furthermore, multiple second air pumps 202 can also reduce the operating load of a single second air pump 202, reducing the risk of overheating shutdown.

[0041] When multiple second air pumps 202 are present, they can be connected in different parallel configurations. For example, in some embodiments, multiple second air pumps 202 are connected in parallel with each other, and then connected in parallel with the first air pump 201.

[0042] Specific reference Figure 1 There are two second air pumps 202. The air supply system also includes a first tee connector 303 and a second tee connector 304. The two second air pumps 202 are connected to the first tee connector 303 through pipelines to achieve the first stage of parallel connection. The first tee connector 303 and the first air pump 201 are then connected to the second tee connector 304 through pipelines to achieve the second stage of parallel connection. The second tee connector 304 is finally connected to the circuit protection valve 1 through pipelines.

[0043] When one first air pump 201 and one second air pump 202 are working, the airflow collides and mixes at the second tee joint 304. When two second air pumps 202 are working, the airflow collides and mixes at the first tee joint 303. When one first air pump 201 and two second air pumps 202 are working simultaneously, the airflow first collides and mixes at the first tee joint 303, and then collides and mixes at the second tee joint 304.

[0044] By adopting a staged parallel connection, the flow resistance of the air supply system at the junction point can be reduced, making the air flow smoother when multiple air pumps work at the same time and improving the air supply efficiency of the air supply system. On this basis, the design of two parallel connections can be further adopted to further reduce the flow resistance of the air supply system at the junction point.

[0045] Of course, besides Figure 1 Besides the graded parallel connection method shown, multiple air pumps can also be connected in parallel in other ways. For example, in some embodiments not shown, multiple air pumps can be connected to a multi-way manifold, and then connected to the circuit protection valve 1 through the manifold. Other feasible parallel connection methods can be found in related technologies, and will not be elaborated here.

[0046] In some embodiments, the gas supply system further includes a condenser 4 and a dryer 5, which are connected between the air pump and the circuit protection valve 1, with the dryer 5 located downstream of the condenser 4. The condenser 4 can separate oil mist and moisture from the gas, and the dryer 5 can further remove residual oil mist and moisture from the gas, ensuring that the gas supply system can supply clean gas to downstream systems.

[0047] In some embodiments, the gas supply system further includes a gas storage tank 6 for storing compressed gas, which is connected between the air pump and the circuit protection valve 1. On the one hand, the gas storage tank 6 can smooth out pressure fluctuations in the gas supply system, making the output gas pressure of the gas supply system more stable; on the other hand, the gas storage tank 6 can also provide compressed gas in emergencies, improving the reliability of the gas supply system.

[0048] For example, refer to Figure 1 In some embodiments, the gas storage tank 6 is connected to the dryer 5. The gas storage tank 6 stores compressed gas that has been processed by the condenser 4 and the dryer 5, thereby reducing the accumulation of impurities such as oil mist and moisture in the gas storage tank 6 and improving the stability of the gas supply system for long-term use.

[0049] At this time, the air tank 6 can also play a role in backwashing. Specifically, when backwashing, the pipeline between the dryer 5 and the circuit protection valve 1, as well as the pipeline between the dryer 5 and the condenser 4, is closed. The exhaust valve of the dryer 5, which is specifically used for backwashing, is opened. When the expanded compressed air flows through the dryer 5, it will carry away the moisture remaining on the surface of the desiccant and discharge it from the outlet of the dryer 5 through the channel and the exhaust valve, thereby keeping the dryer 5 clean.

[0050] In some embodiments, the gas supply system further includes a controller 7, which is communicatively connected to the air pump and is used to control the start and stop of the air pump. The controller 7 can flexibly switch the start and stop of the first air pump 201 and the second air pump 202 according to preset control logic to meet the gas demand in different modes such as hybrid, pure oil, and pure electric.

[0051] Optionally, in some embodiments, the air supply system further includes a pressure sensor 8, which is disposed at the air inlet of the brake master cylinder 9 and is communicatively connected to the controller 7. The pressure sensor 8 can detect the air pressure that the air supply system ultimately outputs to the brake master cylinder 9, which helps to form feedback control with the controller 7, thereby better regulating the air pressure supply.

[0052] For example, in some embodiments, the controller 7 controls the gas supply system in the following manner: In pure fuel mode, only the engine operates normally. Controller 7 activates the first air pump 201, which is driven by the engine. When pressure sensor 8 detects that the air pressure in the air supply system is lower than the first safe air pressure (e.g., 0.7 MPa), controller 7 responds to the signal from pressure sensor 8 by activating the electric motor and the second air pump 202, driving one or more second air pumps 202 to operate until the air pressure reaches the second safe air pressure (e.g., 1.0 MPa). After continuing to operate for a certain redundancy time (e.g., 3 seconds) to ensure the air pressure is stably higher than the second safe air pressure, the second air pump 202 stops operating.

[0053] In pure electric mode, only the electric motor works normally. The controller 7 controls the two second air pumps 202 to work in parallel independently without affecting each other. When the pressure sensor 8 detects that the air pressure of the air supply system is lower than the first safe air pressure, the controller 7 responds to the signal from the pressure sensor, starts the engine and the first air pump 201, and drives the first air pump 201 to work.

[0054] In hybrid mode, the engine and electric motor work together. The controller 7 starts the first air pump 201, and the engine drives the first air pump 201 to work. The second air pump 202 serves as a backup air pump. When the air demand is too high and the pressure sensor 8 detects that the air pressure of the air supply system is lower than the first safe air pressure, the controller 7 responds to the signal of the pressure sensor 8, starts the electric motor and the second air pump 202, and drives one or more second air pumps 202 to work until the air pressure reaches the second safe air pressure.

[0055] Furthermore, in some embodiments, when the second air pump 202 needs to work and the air demand is not high, the controller 7 can control multiple second air pumps 202 to work alternately, thereby avoiding a single second air pump 202 from being in a working state for a long time and reducing the risk of overheating failure of the second air pump 202.

[0056] In some embodiments, the four-circuit protection valve 1 is a four-circuit protection valve. The four-circuit protection valve supplies air to different downstream systems (e.g., the front braking system, rear braking system, parking brake system, and auxiliary air supply system) through four independent air outlets, thus preventing mutual interference between the systems and improving the reliability of the air supply system. Other connection methods between the four-circuit protection valve and downstream systems can be found in relevant technologies and will not be elaborated here.

[0057] Secondly, this utility model also provides a crane, including the air supply system provided by this utility model.

[0058] The crane includes the air supply system provided by this utility model, and therefore has the beneficial effects brought by the air supply system, which will not be elaborated here.

[0059] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A gas supply system, characterized in that, include: Circuit protection valve (1); An air pump, the outlet of which is connected to the inlet of the circuit protection valve (1), the air pump includes a first air pump (201) and a second air pump (202) arranged in parallel, the first air pump (201) is used to connect to the engine, and the second air pump (202) is used to connect to the electric motor. The one-way valve includes a first one-way valve (301) and a second one-way valve (302). The first one-way valve (301) is disposed between the first air pump (201) and the circuit protection valve (1) to prevent gas from flowing back to the first air pump (201). The second one-way valve (302) is disposed between the second air pump (202) and the circuit protection valve (1) to prevent gas from flowing back to the second air pump (202).

2. The gas supply system according to claim 1, characterized in that, The number of the second air pump (202) is at least two, and multiple second air pumps (202) are connected in parallel.

3. The gas supply system of claim 2, wherein, Multiple second air pumps (202) are connected in parallel to each other, and then connected in parallel with the first air pump (201).

4. The gas supply system of claim 3, wherein The number of the second air pumps (202) is two. The air supply system also includes a first three-way connector (303) and a second three-way connector (304). The two second air pumps (202) are connected to the first three-way connector (303) through pipelines. The first three-way connector (303) and the first air pump (201) are connected to the second three-way connector (304) through pipelines. The second three-way connector (304) is connected to the circuit protection valve (1) through pipelines.

5. The gas supply system according to claim 1, characterized in that, It also includes a condenser (4) and a dryer (5), which are connected between the air pump and the circuit protection valve (1), and the dryer (5) is located downstream of the condenser (4).

6. The gas supply system of claim 5, wherein, It also includes a gas storage tank (6), which is connected to the dryer (5).

7. The gas supply system of claim 1, wherein It also includes a controller (7), which is communicatively connected to the air pump and is used to control the start and stop of the air pump.

8. The gas supply system according to claim 7, characterized in that, It also includes a pressure sensor, which is installed at the air inlet of the brake master cylinder (9) and is in communication with the controller.

9. The gas supply system of claim 1, wherein, The circuit protection valve (1) is a four-circuit protection valve.

10. A crane, characterized in that The crane includes the air supply system according to any one of claims 1 to 9.

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