A traveling vehicle air supplement system and a crane

Abstract

The utility model discloses a kind of running vehicle air supplement system and crane, belong to crane technical field, system includes air supplement circuit, gas supply circuit, two-way valve, four circuit protection valve, first running vehicle air cylinder, second running vehicle air cylinder, parking air cylinder, gearbox air cylinder;Air supplement circuit, gas supply circuit are respectively connected to the two air inlets of two-way valve, two-way valve gas outlet is connected to four circuit protection valve, first running vehicle air cylinder, second running vehicle air cylinder, parking air cylinder are respectively connected to the gas outlet of four circuit protection valve, gearbox air cylinder is connected to the gas outlet of two-way valve;Air supplement circuit includes sequentially connected operation engine, first air compressor, first drier and quick connector group, quick connector group is connected to the first air inlet of two-way valve;The utility model makes full use of the operation engine of vehicle itself to running system air path carries out air supplement, improve the security of vehicle running, the convenience of use, reduce vehicle maintenance use cost.

Description

Technical Field

[0001] This utility model relates to a vehicle air replenishment system and a crane, belonging to the field of crane technology. Background Technology

[0002] Background 1: Mobile cranes and other engineering vehicles operate over a wide area in poor road conditions, frequently descending long slopes, especially in the mountainous regions of southwest and northwest. When going downhill, drivers frequently apply and release the brakes, causing the air pressure to gradually decrease and reducing braking response. Once the pressure drops to a certain level, the braking force becomes insufficient to maintain a constant vehicle speed, increasing driving risks. Simultaneously, downhill driving at low vehicle speeds corresponds to lower engine speeds, resulting in slower air compressor charging and insufficient replenishment of brake gas. Once the brake gas is depleted, it cannot be quickly replenished.

[0003] When faced with this situation, drivers often pull over and wait for the air pressure to rise before continuing to drive. This affects vehicle speed and causes traffic congestion.

[0004] Background 2: In some commercial vehicles, the automatic transmissions rely on cylinders for gear shifting. When the air pressure drops below a certain value, shifting becomes impossible. When the engine is not in neutral (N), but in a drive or reverse gear, the system restricts engine ignition to protect the transmission from damage. This creates a problem: if the driver forgets to shift the transmission to neutral before turning off the engine, and the air pressure in the reservoir is low before the next ignition attempt (due to a long interval or poor gas pressure retention), ignition will fail. Without ignition, the engine cannot charge the air reservoir, and the reservoir pressure will not rise.

[0005] When this happens, drivers often need to find a portable air source (or a mobile tire repair shop, etc.) to inflate the air tank. Once the air pressure in the transmission tank reaches the required level for shifting, they shift to neutral and then start the engine. This causes inconvenience and incurs additional costs for the driver.

[0006] Background 3: When a chassis engine is damaged and towing is required, the parking brake is an air brake. Before towing, the parking brake needs to be released. The traditional method is to remove the push rod at the rear of the brake caliper (also called the brake chamber) to release the parking brake. However, this is time-consuming and laborious. Utility Model Content

[0007] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a vehicle air replenishment system and crane, which makes full use of the vehicle's own working engine to replenish the air circuit of the driving system, improves the safety of vehicle driving, the convenience of use, and reduces the vehicle maintenance and use costs.

[0008] To achieve the above objectives, this utility model employs the following technical solution: In a first aspect, this utility model provides a vehicle air replenishment system, including an air replenishment circuit, an air supply circuit, a two-way valve, a four-way protection valve, a first driving air reservoir, a second driving air reservoir, a parking air reservoir, and a gearbox air reservoir; the air replenishment circuit and the air supply circuit are respectively connected to the two ends of the two-way valve, the outlet of the two-way valve is connected to the inlet of the four-way protection valve, the first driving air reservoir, the second driving air reservoir, and the parking air reservoir are respectively connected to the outlet of the four-way protection valve, and the gearbox air reservoir is connected to the outlet of the two-way valve; The air replenishment circuit includes a working engine, a first air compressor, a first dryer, and a quick-connect assembly connected in sequence. The quick-connect assembly is connected to the first air inlet of a two-way valve. The air supply circuit includes a driving engine, a second air compressor, and a second dryer connected in sequence, with the second dryer connected to the second air inlet of a two-way valve.

[0009] Furthermore, the second air inlet and outlet of the bidirectional valve can be selectively and directly connected to the following branch, with the outlet end connected to the air inlet end of the air storage tank: The pipeline between the first crane air reservoir and the four-circuit protection valve; The pipeline between the second overhead crane air reservoir and the four-circuit protection valve; The pipeline between the parking air reservoir and the four-circuit protection valve; The air intake pipe of the gearbox air reservoir.

[0010] Furthermore, the system also includes a second regeneration gas storage tank, which is connected to the regeneration port of the second dryer via a pipeline.

[0011] Furthermore, the quick-connect assembly is a manually operated pneumatic quick-connect, which blocks the air path from the first dryer to the two-way valve when disconnected.

[0012] Furthermore, the quick-connect assembly can be replaced by other types of shut-off valves or the quick-connect assembly can be omitted.

[0013] Furthermore, a heat dissipation pipe is provided on the pipeline between the output end of the second air compressor and the input end of the second dryer; and a heat dissipation pipe is provided on the pipeline between the output end of the first air compressor and the input end of the first dryer.

[0014] Furthermore, a condenser and / or a pressure regulating valve may be provided in the air replenishment circuit. The condenser is installed between the first air compressor and the dryer, and the air inlet of the pressure regulating valve is connected to the air outlet of the air compressor.

[0015] Furthermore, the bidirectional valve can be replaced by two unidirectional valves.

[0016] Secondly, the present invention provides a vehicle air replenishment system, including an air replenishment circuit, an air supply circuit, a two-way valve, a dryer, a four-circuit protection valve, a first driving air reservoir, a second driving air reservoir, a parking air reservoir, and a gearbox air reservoir; the air replenishment circuit and the air supply circuit are respectively connected to the two ends of the two-way valve, the outlet of the two-way valve is connected to the inlet of the dryer, the outlet of the dryer is connected to the inlet of the four-circuit protection valve, the first driving air reservoir, the second driving air reservoir, and the parking air reservoir are respectively connected to the outlet of the four-circuit protection valve, and the gearbox air reservoir is connected to the outlet of the dryer; The air replenishment circuit includes a working engine, a first air compressor, and a quick-connect assembly connected in sequence, wherein the quick-connect assembly is connected to the first air inlet of a two-way valve. The air supply circuit includes a driving engine and a second air compressor connected in sequence, with the second air compressor connected to the second air inlet of a two-way valve.

[0017] Thirdly, the present invention provides a crane including a vehicle air replenishment system as described in any of the preceding claims.

[0018] Compared with the prior art, the beneficial effects achieved by this utility model are as follows: This utility model provides a vehicle air replenishment system and a crane, which makes full use of the vehicle's own working engine to replenish the air circuit of the driving system, thereby improving the safety of vehicle driving, the convenience of use, and reducing vehicle maintenance and use costs.

[0019] When driving down long slopes or in other situations where the engine air supply is insufficient, starting the auxiliary engine inflates the braking system, greatly increasing the inflation speed and ensuring driving safety. This reduces reliance on driver skill and waiting time.

[0020] When a vehicle malfunctions, has low air pressure, or the parking brake cannot be released, the working engine can be started to inflate the parking air tank, releasing the parking brake and easily enabling towing and other functions. This saves the time spent on the conventional operation of retracting the jack, improving work efficiency.

[0021] In case of vehicle malfunction or operational error, this system can resolve the conflict between insufficient air pressure in the transmission shifting chamber and the inability to start the engine. By working the engine to inflate the transmission's air reservoir, the engine can be started once the pressure in the reservoir has increased. This reduces the use of auxiliary air supply sources and lowers vehicle maintenance costs. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a vehicle air replenishment system provided in an embodiment of this utility model; Figure 2 This is a schematic diagram of a conventional gas path system provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the air supply system for the shared dryer provided in this embodiment of the utility model; Figure 4 This is a schematic diagram of the structure of the bidirectional valve provided in this embodiment of the utility model.

[0023] In the diagram: 11. Operating engine; 12. Traveling engine; 21. First air compressor; 22. Second air compressor; 3. Dryer; 31. First dryer; 32. Second dryer; 41. Four-circuit protection valve; 42. Inflation switch; 43. Overflow valve; 44. Check valve; 45. Quick-connect fitting assembly; 46. Two-way valve; 51. First traveling air reservoir; 52. Second traveling air reservoir; 53. Parking air reservoir; 54. Gearbox air reservoir; 55. First regenerative air reservoir; 56. Second regenerative air reservoir; 61. First traveling brake air circuit; 62. Parking brake air circuit; 63. Second traveling brake air circuit; 64. Gearbox air circuit. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0025] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] Example 1, such as Figure 1 As shown, this embodiment introduces a vehicle air replenishment system, including an air replenishment circuit, an air supply circuit, a two-way valve 46, a four-circuit protection valve 41, a first driving air reservoir 51, a second driving air reservoir 52, a parking air reservoir 53, and a gearbox air reservoir 54. The air replenishment circuit and the air supply circuit are respectively connected to the two ends of the two-way valve 46. The air outlet (2 ports) of the two-way valve is connected to the air inlet of the four-circuit protection valve 41. The first driving air reservoir 51, the second driving air reservoir 52, and the parking air reservoir 53 are respectively connected to the air outlet of the four-circuit protection valve 41. The gearbox air reservoir 54 is connected to the air outlet (2 ports) of the two-way valve 46. The air replenishment circuit includes a working engine 11, a first air compressor 21, a first dryer 31, and a quick-connect fitting assembly 45 connected in sequence. The quick-connect fitting assembly 45 is connected to the first air inlet (port 11) of the two-way valve 46. The air supply circuit includes a driving engine 12, a second air compressor 22, and a second dryer 32 connected in sequence. The second dryer 32 is connected to the second air inlet (port 12) of the two-way valve 46. The air outlet of the two-way valve 46 can be selectively connected directly to the air inlet branch of any of the following air storage cylinders: The pipeline between the first overhead air reservoir 51 and the four-circuit protection valve 41; The pipeline between the second overhead crane air reservoir 52 and the four-circuit protection valve 41; The pipeline between the parking air reservoir 53 and the four-circuit protection valve 41; The air intake pipe of the gearbox air reservoir 54.

[0028] like Figure 4As shown, the bidirectional valve has two air inlets (port 11 and port 12) and one air outlet (port 2). If one air inlet has air, then port 2 will also have air; and the two air inlets are independent of each other, preventing cross-contamination. Regardless of whether air pressure enters from port 11 or port 12, the air pressure pushes the piston (a) to the other end, thus closing the end without air intake, and compressed air flows into the connected device from port 2. If the air pressure in the activated circuit drops or is interrupted and the air pressure at the other end is greater, the piston (a) moves in the opposite direction, and compressed air flows into the braking device from the other circuit.

[0029] like Figure 1 As shown, the working engine 11 provides power to the vehicle working system and the first air compressor 21; the driving engine 12 provides power to the vehicle driving system and the second air compressor 22; the first air compressor 21 is driven by the working engine 11, and compressed air provides a high-pressure air source for the vehicle's air supply system; the second air compressor 22 is driven by the driving engine 12, and compressed air provides a high-pressure air source for the vehicle's air supply system; the first dryer 31 dries the high-pressure gas from the first air compressor 21, and provides dried high-pressure gas to the vehicle's air supply system; the second dryer 32 dries the high-pressure gas from the first air compressor 21. The high-pressure gas from the second air compressor 22 is dried to provide dry, high-pressure gas to the vehicle's air supply system. The four-circuit protection valve 41 diverts the gas from the dryer to the first service brake air circuit 61, the parking brake air circuit 62, and the second service brake air circuit 63, ensuring that air continues to be supplied to the other circuits at a certain pressure even if one air circuit fails. The inflation switch 42 controls the connection between the parking air reservoir 53 and the external air source / air supply system. The overflow valve 43 ensures that the gas from the dryer flows preferentially to the other circuits compared to the gearbox air circuit 64. The system includes a one-way valve 44 to ensure gas can flow from the dryer to the gearbox air reservoir 54, but not from the gearbox air reservoir 54 back to the dryer; a quick-connect assembly 45 for quick connection of the air supply circuit and the vehicle air system; a two-way valve 46 to ensure gas from the first dryer 31 and the second dryer 32 can flow unidirectionally to the vehicle air system, but not vice versa, while the first dryer 31 and the second dryer 32 cannot flow between each other; and a first service air reservoir 51 stores high-pressure gas from the four-circuit protection valve 41 to provide gas to the first service brake air circuit 61. The second travel air reservoir 52 stores high-pressure gas from the four-circuit protection valve 41, providing an air source for the second travel brake air circuit 63; the parking air reservoir 53 stores high-pressure gas from the four-circuit protection valve 41, providing an air source for the parking brake air circuit 62; the gearbox air reservoir 54 stores high-pressure gas from the dryer, providing an air source for the gearbox air circuit 64; the first regeneration air reservoir 55 is used to backflush the dryer 31 and regenerate the desiccant in the dryer 31; the second regeneration air reservoir 56 is used to backflush the dryer 32 and regenerate the desiccant in the dryer 32.

[0030] Conventional gas path system ( Figure 1 When the outer circuit of the center frame is working, the driving engine 12 provides power to the second air compressor 21. The second air compressor 21 compresses the air, and the high-pressure gas generated is dried by the second dryer 32. One path flows through the overflow valve 43 and the one-way valve 44 to the gearbox air reservoir 54 to provide air source for the gearbox air circuit 64. Another path flows through the four-circuit protection valve 41 to the first driving air reservoir 51 to provide air source for the first driving brake air circuit 61, to the second driving air reservoir 52 to provide air source for the second driving brake air circuit 63, and to the parking air reservoir 53 to provide air source for the parking brake air circuit 62.

[0031] After adding the make-up air circuit, the working engine 11 drives the first air compressor 21 to generate high-temperature, humid air. The air temperature is lowered by cooling through the cooling pipes, and then the air enters the first dryer 31 for drying. The first dryer 31 outputs gas usable by the chassis air circuit system. The gas is connected in parallel with the conventional air supply circuit through a two-way valve 46. The original air supply circuit (air source supply circuit) and the make-up air circuit are respectively connected to the two inlets of the two-way valve 46, and the outlet of the two-way valve 46 is connected to the air circuit system circuit. To facilitate the disconnection and connection of the make-up air circuit and the conventional air supply circuit, a quick-connect fitting assembly 45 is added to the pipeline between the first dryer 31 and the two-way valve 46. When air is needed from the working engine 11, the male and female ends of the quick-connect fitting assembly 45 are connected together; when not needed, the male and female ends of the quick-connect fitting assembly are disconnected. Since the working engine 11 can operate continuously, it can continuously provide high-pressure gas.

[0032] When the operating engine 11 and the driving engine 12 simultaneously supply air to the air circuit system, regardless of which inlet (e.g., port 11) the air pressure enters from, the air pressure pushes the piston (a) to the other end (port 12), thus closing the end (port 12) without air intake (or with low air pressure), and the inlet (port 11) and outlet (port 2) are connected to form a passage. If the air pressure in the activated circuit (port 11) drops or is interrupted and the air pressure at the other end (port 12) is greater, the piston (a) moves in the opposite direction, and the inlet (port 12) and outlet (port 2) are connected to form a passage.

[0033] like Figure 2 The diagram shows a conventional air circuit system. An air replenishment circuit is added between the dryer 3 and the four-circuit protection valve 41, thus replenishing air to the entire air circuit system, including the first service brake air circuit 61, the parking brake air circuit 62, the second service brake air circuit 63, and the transmission air circuit 64. Simultaneously, air replenishment circuits can be added to other locations, such as... Figure 2 Positions B, C, D, and E in the text.

[0034] If the air replenishment circuit is added to position B, the near-air end (end 1) of position B is connected to the second air inlet of the two-way valve 46, and the far-air end (end 2) of position B is connected to the air outlet of the two-way valve 46. At this time, the air replenishment circuit can only replenish air to the first travel air reservoir 51, increasing the braking pressure of the first travel brake air supply circuit 61. When the working engine 11 fills the first travel air reservoir 51, the travel engine 12 can reduce the amount of air it fills the first travel air reservoir 51, or even not fill it at all. In this way, the gas generated by the travel engine 12 can be used more for other air reservoirs, such as the second travel air reservoir 52. Generally, the first travel air reservoir 51 and the second travel air reservoir 52 have a larger volume than the gearbox air reservoir 54 and the parking air reservoir 53. This solution can also better solve the problem in background 1. The air replenishment circuit added to position D has a similar mechanism and effect to position B, and will not be described separately.

[0035] If the air replenishment circuit is extended to position C, the near air end (end 1) of position C is connected to the second air inlet of the two-way valve 46, and the far air end (end 2) of position C is connected to the air outlet of the two-way valve 46. At this time, the air replenishment circuit can only replenish air to the parking air reservoir 53, increasing the pressure for releasing the parking brake. This solution is mainly used to solve the problem in Background 3. When the driving engine 12 malfunctions and cannot fill the parking air reservoir 53, the working engine 11 fills the parking air reservoir 53 through the air replenishment circuit to release the parking brake.

[0036] If the air replenishment circuit is extended to position E, the near-air end (end 1) of position E is connected to the second air inlet of the two-way valve 46, and the far-air end (end 2) of position E is connected to the air outlet of the two-way valve 46. At this time, the air replenishment circuit can only replenish air to the transmission air reservoir 54, increasing the pressure of the transmission air reservoir 54 for transmission gear shifting. This solution is mainly used to address the problem in Background 2: when the transmission gear is not in neutral and the air pressure in the transmission air reservoir 54 is low, preventing the driving engine 12 from starting, the operating engine 11 replenishes air to the transmission air reservoir 54 through the air replenishment circuit, providing shifting pressure. Once the driving engine 12 starts normally, the air replenishment circuit can be disconnected.

[0037] The vehicle air replenishment system provided in this embodiment makes full use of the vehicle's own engine 11 to replenish the air circuit of the driving system, thereby improving the safety of vehicle driving, the convenience of use, and reducing the vehicle maintenance and usage costs.

[0038] When driving down a long slope or in other situations where the engine 12 is under-supplied with air, the operating engine 11 is turned on to inflate the braking system, greatly increasing the inflation speed and ensuring driving safety. This reduces reliance on driver skills and waiting time.

[0039] When a vehicle malfunctions, has low air pressure, or the parking brake cannot be released, the working engine 11 is turned on to inflate the parking air reservoir 53, releasing the parking brake and easily enabling towing and other functions. This saves the time spent on the conventional operation of retracting the jacking rod, improving work efficiency.

[0040] In the event of a vehicle malfunction or operational error, this system can resolve the conflict between insufficient air pressure in the transmission shifting system and the inability to start the engine. The working engine 11 inflates the transmission air reservoir 54, and once the pressure in the reservoir 54 has increased, the driving engine 12 can be started. This reduces the use of auxiliary air supply sources and lowers vehicle maintenance costs.

[0041] Example 2, as Figure 3 As shown, this embodiment provides a vehicle air replenishment system, including an air replenishment circuit, an air supply circuit, a two-way valve 46, a dryer 3, a four-circuit protection valve 41, a first vehicle air reservoir 51, a second vehicle air reservoir 52, a parking air reservoir 53, and a gearbox air reservoir 54. The air replenishment circuit and the air supply circuit are respectively connected to the two ends of the two-way valve 46. The outlet of the two-way valve is connected to the inlet of the dryer 3. The outlet of the dryer 3 is connected to the inlet of the four-circuit protection valve 41. The first vehicle air reservoir 51, the second vehicle air reservoir 52, and the parking air reservoir 53 are respectively connected to the outlet of the four-circuit protection valve 41. The gearbox air reservoir 54 is connected to the outlet of the dryer 3. The air replenishment circuit includes a working engine 11, a first air compressor 21 and a quick-connect assembly 45 connected in sequence, and the quick-connect assembly 45 is connected to the first air inlet of a two-way valve 46. The air supply circuit includes a driving engine 12 and a second air compressor 22 connected in sequence, and the second air compressor 22 is connected to the second air inlet of the two-way valve 46.

[0042] In this embodiment, the output gas from the working engine and the output gas from the driving engine share a single dryer. This solution adds a supplementary air circuit to the existing conventional air circuit system. Compared with Embodiment 1, the supplementary air circuit in this embodiment no longer contains a dryer. The supplementary air circuit is connected between the second air compressor 22 and the dryer 3 via a two-way valve 46. In this way, the working engine 11 and the driving engine 12 provide power to the first air compressor 21 and the second air compressor 12, respectively. The high-pressure gas compressed by the first air compressor 21 is connected to the first air inlet of the two-way valve 46 via a quick-connect fitting assembly 45, and the high-pressure gas compressed by the second air compressor 22 is connected to the second air inlet of the two-way valve 46. Both gases are dried by the dryer 3 to provide an air source for the vehicle's air circuit. The connection principles and functions of the remaining components and pipelines are the same as in Embodiment 1, and will not be described again.

[0043] This embodiment does not require an additional dryer, resulting in low overall cost.

[0044] Example 3: This example provides a crane, including a vehicle air replenishment system as described in any one of Examples 1 or 2.

[0045] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A vehicle refueling system, characterized in that, It includes an air replenishment circuit, an air supply circuit, a two-way valve (46), a four-circuit protection valve (41), a first driving air tank (51), a second driving air tank (52), a parking air tank (53), and a gearbox air tank (54); the air replenishment circuit and the air supply circuit are respectively connected to the first air inlet and the second air inlet of the two-way valve (46), the air outlet of the two-way valve is connected to the air inlet of the four-circuit protection valve (41), the first driving air tank (51), the second driving air tank (52), and the parking air tank (53) are respectively connected to the air outlet of the four-circuit protection valve (41), and the gearbox air tank (54) is connected to the air outlet of the two-way valve (46); The air replenishment circuit includes a working engine (11), a first air compressor (21), a first dryer (31), and a quick-connect assembly (45) connected in sequence. The quick-connect assembly (45) is connected to the first air inlet of a two-way valve (46). The air supply circuit includes a driving engine (12), a second air compressor (22) and a second dryer (32) connected in sequence, with the second dryer (32) connected to the second air inlet of a two-way valve (46).

2. The vehicle refueling system according to claim 1, characterized in that: The second inlet and outlet of the two-way valve (46) can be selectively connected directly to the following branch: The pipeline between the first air tank (51) and the four-circuit protection valve (41); The pipeline between the second overhead crane air reservoir (52) and the four-circuit protection valve (41); The pipeline between the parking air reservoir (53) and the four-circuit protection valve (41); The air intake pipe of the gearbox air reservoir (54).

3. The vehicle refueling system according to claim 1, characterized in that: The system also includes a second regeneration gas storage tank (56), which is connected to the regeneration port of the second dryer (32) via a pipeline.

4. The vehicle refueling system according to claim 1, characterized in that: The quick-connect assembly (45) is a manually operated pneumatic quick-connect that blocks the air path from the first dryer (31) to the two-way valve (46) when disconnected.

5. The vehicle refueling system according to claim 1, characterized in that: A heat dissipation pipe is provided on the pipeline between the output end of the second air compressor (22) and the input end of the second dryer (32); and a heat dissipation pipe is provided on the pipeline between the output end of the first air compressor (21) and the input end of the first dryer (31).

6. The vehicle refueling system according to claim 1, characterized in that: The air replenishment circuit is equipped with a condenser and / or a pressure regulating valve. The condenser is installed between the first air compressor and the dryer, and the air inlet of the pressure regulating valve is connected to the air outlet of the air compressor.

7. A vehicle refueling system, characterized in that, It includes an air replenishment circuit, an air supply circuit, a two-way valve (46), a dryer (3), a four-circuit protection valve (41), a first driving air tank (51), a second driving air tank (52), a parking air tank (53), and a gearbox air tank (54); the air replenishment circuit and the air supply circuit are respectively connected to the two ends of the two-way valve (46), the outlet of the two-way valve is connected to the inlet of the dryer (3), the outlet of the dryer (3) is connected to the inlet of the four-circuit protection valve (41), the first driving air tank (51), the second driving air tank (52), and the parking air tank (53) are respectively connected to the outlet of the four-circuit protection valve (41), and the gearbox air tank (54) is connected to the outlet of the dryer (3); The air replenishment circuit includes a working engine (11), a first air compressor (21), and a quick-connect fitting assembly (45) connected in sequence. The quick-connect fitting assembly (45) is connected to the first air inlet of a two-way valve (46). The air supply circuit includes a driving engine (12) and a second air compressor (22) connected in sequence, and the second air compressor (22) is connected to the second air inlet of a two-way valve (46).

8. A crane, characterized in that: Includes a vehicle refueling system as described in any one of claims 1 to 7.

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