An air suspension air circuit control system with lifting airbag

Abstract

The present invention discloses an air suspension air circuit control system with a lifting airbag, belonging to the technical field of commercial vehicle equipment. It solves the defects of the existing technology that the lifting bridge stretches and deflates the load-bearing airbag during the lowering process and the air suspension air circuit control pipeline is complicated. It mainly includes an air reservoir, a first solenoid valve, a second solenoid valve, a lifting airbag, a height valve, a relay valve, a lifting load-bearing airbag, a switch and a conventional load-bearing airbag. The air reservoir is connected to the first air pipe branch, the second air pipe branch and the third air pipe branch respectively through the first air pipe. The first air outlet B on the first solenoid valve is connected to the lifting airbags on both sides, and the first air outlet A is connected to the relay valve air inlet 4 on the relay valve; the second air outlet B on the second solenoid valve is connected to the lifting load-bearing airbags on both sides; the height valve air outlet 22 on the height valve is connected to the relay valve air inlet 1, and the relay valve air outlet 2 is connected to the lifting load-bearing airbag.

Description

Technical Field

[0001] The invention belongs to the technical field of commercial vehicle equipment, and in particular relates to an air suspension air circuit control system with a lifting air bag. Background Art

[0002] Lifting axle refers to a vehicle axle that can be raised and lowered freely. After lifting, the axle tires can leave the ground. We also call it a suspended bridge. With the rapid development of infrastructure and economy in recent years, lifting axles have shown their role in transporting vehicles and are widely used. Currently, lifting axles are generally raised and lowered by inflating and deflating lifting airbags. When the vehicle is fully loaded, the lifting airbags are deflated, and the lifting axle is lowered to play a load-bearing role; when the vehicle is unloaded or the load is light, the lifting airbags are inflated to lift the lifting axle, reducing the friction resistance between the tires and the ground, reducing fuel consumption, and also reducing tire wear.

[0003] Lifting airbags and load-bearing airbags are installed on both sides of the lifting axle. When the lifting axle is lifted, the lifting airbags are inflated and the load-bearing airbags on both sides of the lifting axle are deflated at the same time. The lifting axle will compress the load-bearing airbags on both sides during the rising process to accelerate the exhaust of the load-bearing airbags on both sides of the lifting axle; when the lifting axle remains in a raised state, the load-bearing airbags on both sides of the lifting axle are deflated and concave. At this time, the shrinkage of the load-bearing airbags on both sides of the lifting axle is often not serious. However, during the lowering process of the lifting axle, the load-bearing airbags on both sides of the lifting axle will be severely shrunken and stretched, which seriously affects their service life, especially in winter. The load-bearing airbags on the lifting axle are very prone to fracture and damage, resulting in increased warranty and use costs of the entire vehicle and reduced vehicle stability. The reason for this situation is that when the lifting axle is lowered and stretched, the compressed load-bearing airbags on both sides are compressed. When the lifting axle is lowered, the load-bearing airbags on both sides of the lifting axle fail to be inflated quickly and in time, and the lifting airbags are exhausted when the lifting axle is lowered. The load-bearing airbags on both sides of the lifting axle are connected with the load-bearing airbags on the ordinary axle. The gas in the load-bearing airbags on the ordinary axle flows into the load-bearing airbags on both sides of the lifting axle driven by the air pressure difference. However, the lifting axle must be lowered before the truck is loaded, that is, the truck is empty or lightly loaded when the lifting axle is lowered. At this time, due to the adjustment of the height valve, the air pressure value in the load-bearing airbags of the ordinary axle is very small, which causes the gas flow speed to the load-bearing airbags on both sides of the lifting axle to be very slow, and the deflated airbags cannot be quickly inflated in a short time; secondly, the current truck lifting axle still has the problem that the air suspension air circuit control pipeline needs to be connected to the pneumatic pipeline of the braking system, the pipeline is complicated, prone to failure, and troublesome later maintenance. Summary of the invention

[0004] The object of the present invention is to provide an air suspension air circuit control system with a lifting air bag, so as to overcome the defects of the prior art in that the lifting bridge is stretched and deflated during the lowering process and the air suspension air circuit control pipeline is complicated.

[0005] The present invention is implemented by adopting the following technical scheme: an air suspension air circuit control system with a lifting airbag, comprising an air reservoir, a first solenoid valve, a second solenoid valve, a lifting airbag, a height valve, a relay valve, a lifting load-bearing airbag, a switch and a conventional load-bearing airbag, wherein the air reservoir is respectively connected to a first air pipe branch, a second air pipe branch and a third air pipe branch through a first air pipe, the first air pipe branch is connected to a first air inlet P on a first solenoid valve, a first air outlet B on the first solenoid valve is connected to lifting airbags on both sides, and the first air outlet A is connected to Connected to the relay valve air inlet 4 on the relay valve; the second air pipe branch is connected to the second air inlet P on the second solenoid valve, and the second air outlet B on the second solenoid valve is connected to the lifting and loading airbags on both sides; the third air pipe branch is connected to the height valve air inlet 1 on the height valve, the height valve air outlet 1 21 on the height valve is connected to the conventional loading airbag, the height valve air outlet 2 22 on the height valve is connected to the relay valve air inlet 1, and the relay valve is also provided with a relay valve air outlet 2 and a relay valve exhaust port, and the relay valve air outlet 2 is connected to the lifting and loading airbag.

[0006] Furthermore, in the lifting process of the lifting bridge: the switch controls the first solenoid valve to be opened and the second solenoid valve to be normally closed. When the first solenoid valve is opened, the first air inlet P on the first solenoid valve is connected to the first air outlet B, and the first air inlet P is not connected to the first air outlet A. The high-pressure gas in the air storage cylinder enters the lifting airbags on both sides through the first air outlet B, and the lifting airbags on both sides are inflated. At the same time, since the high-pressure gas passing through the first solenoid valve cannot enter the relay valve air inlet 4 through the first air outlet A, the relay valve air inlet 1 is not connected to the relay valve air outlet 2, and the relay valve air outlet 2 is connected to the relay valve exhaust port. The high-pressure gas in the lifting and bearing airbags on both sides is discharged through the relay valve exhaust port. When the second solenoid valve is normally closed, the second air inlet P on the second solenoid valve is not connected to the second air outlet B. When the lifting bridge is in the lifting state, the first solenoid valve remains normally open and the second solenoid valve remains normally closed.

[0007] The lowering process of the lifting bridge: the switch controls the first solenoid valve to be closed, and controls the second solenoid valve to be energized at the same time. When the first solenoid valve is closed, the first air inlet P on the first solenoid valve is not connected to the first air outlet B, and the first air inlet P is connected to the first air outlet A. The lifting airbag is exhausted through the exhaust port on the first solenoid valve, and at the same time, the high-pressure gas in the first solenoid valve enters the relay valve air inlet 4, so that the relay valve air inlet 1 is connected to the relay valve air outlet 2, and the relay valve air outlet 2 is not connected to the relay valve exhaust port. The airflow in the conventional load-bearing airbag slowly enters the lifting load-bearing airbag. When the second solenoid valve is energized, the second air inlet P on the second solenoid valve is connected to the second air outlet B, and the high-pressure gas through the second solenoid valve enters the lifting load-bearing airbag and inflates the load-bearing airbag. The switch controls the second solenoid valve to open for a certain period of time and then close. When the lifting bridge is in the lowering state, the first solenoid valve remains normally closed and the second solenoid valve remains normally closed.

[0008] Furthermore, a filter is installed on the first air pipe.

[0009] Furthermore, the switch includes a first relay and a second relay, the first relay is connected to the first solenoid valve, the second relay is a time delay relay and is connected to the second solenoid valve, and the second relay works when the first relay is closed.

[0010] Furthermore, the delay time of the second relay is 1-10 seconds.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1. The present invention can prevent the load-bearing airbag on the lifting bridge from being deflated during the process of the lifting bridge being lowered. By setting the second air pipe branch and the second solenoid valve, when the lifting bridge is lowered from the raised state, the lifting airbag is deflated, and at the same time, the second air pipe branch quickly supplies air to the lifting load-bearing airbags on both sides through the second solenoid valve for 1-10 seconds, so that the lifting load-bearing airbags are quickly inflated. When the lifting bridge moves downward under the action of gravity and pulls the concave lifting load-bearing airbag to extend downward, the lifting load-bearing airbag is quickly inflated for a certain period of time at the same time, which prevents the lifting load-bearing airbag from being stretched when deflated, greatly prolonging its service life by 2-3 times, fundamentally solving the problem that the lifting load-bearing airbag on the lifting bridge is easily damaged, reducing maintenance costs and improving use stability, which is of great significance to the popularization and configuration of the lifting bridge in trailers.

[0013] 2. The air suspension air circuit control pipeline described in the present invention is simpler and more efficient. The air reservoir is connected to the main air supply pipeline of the trailer. A gas overflow valve is installed on the main air supply pipeline. The air outlet of the gas overflow valve is connected to the brake pipeline. The exhaust port of the gas overflow valve is connected to the air reservoir. In this way, air is supplied to the air reservoir only when the air pressure in the brake pipeline is sufficient, thereby ensuring the braking safety of the vehicle. At the same time, the brake pipeline and the air suspension air circuit control pipeline are independent of each other, thereby making the air suspension air circuit control pipeline simpler, more efficient and more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the present invention.

[0015] Marking instructions: 1. Air cylinder; 2. First solenoid valve; 3. Second solenoid valve; 4. Lifting airbag; 5. Height valve; 6. Relay valve; 7. Lifting load-bearing airbag; 8. Switch; 9. Conventional load-bearing airbag; 10. Filter; 11. First air pipe; 12. First air pipe branch; 13. Second air pipe branch; 14. Third air pipe branch; 15. Main air supply pipeline; 16. Gas overflow valve. DETAILED DESCRIPTION

[0016] The present invention will be further described below in conjunction with the accompanying drawings.

[0017] An air suspension air circuit control system with a lifting airbag, comprising an air reservoir 1, a first solenoid valve 2, a second solenoid valve 3, a lifting airbag 4, a height valve 5, a relay valve 6, a lifting load-bearing airbag 7, a switch 8 and a conventional load-bearing airbag 9, wherein the air reservoir 1 is respectively connected to a first air pipe branch 12, a second air pipe branch 13 and a third air pipe branch 14 through a first air pipe 11, the first air pipe branch 12 is connected to a first air inlet P on a first solenoid valve 2, a first air outlet B on the first solenoid valve 2 is connected to the lifting airbags 4 on both sides, and the first air outlet A is connected to the relay valve 6. The relay valve air inlet 4 on the valve 6; the second air pipe branch 13 is connected to the second air inlet P on the second solenoid valve 3, and the second air outlet B on the second solenoid valve 3 is connected to the lifting and loading airbags 7 on both sides; the third air pipe branch 14 is connected to the height valve air inlet 1 on the height valve 5, the height valve air outlet 1 21 on the height valve 5 is connected to the conventional loading airbag 9, and the height valve air outlet 2 22 on the height valve 5 is connected to the relay valve air inlet 1, and the relay valve 6 is also provided with a relay valve air outlet 2 and a relay valve exhaust port, and the relay valve air outlet 2 is connected to the lifting and loading airbag 7.

[0018] The lifting process of the lifting bridge: the switch 8 controls the first solenoid valve 2 to be opened and the second solenoid valve 3 to be normally closed. When the first solenoid valve 2 is opened, the first air inlet P on the first solenoid valve 2 is connected to the first air outlet B, and the first air inlet P is not connected to the first air outlet A. The high-pressure gas in the air storage cylinder 1 enters the lifting airbags 4 on both sides through the first air outlet B, and the lifting airbags 4 on both sides are inflated. At the same time, since the high-pressure gas passing through the first solenoid valve 2 cannot enter the relay valve air inlet 4 through the first air outlet A, the relay valve air inlet 1 is not connected to the relay valve air outlet 2, and the relay valve air outlet 2 is connected to the relay valve exhaust port. The high-pressure gas in the lifting and bearing airbags 7 on both sides is discharged through the relay valve exhaust port. When the second solenoid valve 3 is normally closed, the second air inlet P on the second solenoid valve 3 is not connected to the second air outlet B. When the lifting bridge is in the lifting state, the first solenoid valve 2 remains normally open, and the second solenoid valve 3 remains normally closed.

[0019] The lowering process of the lifting bridge: the switch 8 controls the first solenoid valve 2 to close, and controls the second solenoid valve 3 to be energized. When the first solenoid valve 2 is closed, the first air inlet P on the first solenoid valve 2 is not connected to the first air outlet B, and the first air inlet P is connected to the first air outlet A. The lifting airbag 4 is exhausted through the exhaust port on the first solenoid valve 2, and at the same time, the high-pressure gas in the first solenoid valve 2 enters the relay valve air inlet 4, so that the relay valve air inlet 1 is connected to the relay valve air outlet 2, and the relay valve air outlet 2 is not connected to the relay valve exhaust port. The air flow in the conventional load-bearing airbag 9 slowly enters the lifting load-bearing airbag 7. When the second solenoid valve 3 is energized, the second air inlet P on the second solenoid valve 3 is connected to the second air outlet B, and the high-pressure gas through the second solenoid valve 3 enters the lifting load-bearing airbag 7 and inflates the load-bearing airbag. The switch 8 controls the second solenoid valve 3 to open for a certain period of time and then close. When the lifting bridge is in the lowering state, the first solenoid valve 2 remains normally closed and the second solenoid valve 3 remains normally closed.

[0020] The air reservoir 1 described in the present invention is connected to the main air supply pipeline 15 of the truck, and a gas overflow valve 16 is installed on the main air supply pipeline 15. The air outlet of the gas overflow valve 16 is connected to the brake pipeline, and the exhaust port of the gas overflow valve 16 is connected to the air reservoir 1. In this way, air is supplied to the air reservoir 1 only when the air pressure in the brake pipeline is sufficient. When the air pressure in the brake pipeline is insufficient, the overflow valve stops supplying air to the air reservoir 1 and only supplies air to the brake pipeline, thereby ensuring the braking safety of the vehicle and making the brake pipeline and the air suspension air circuit control pipeline independent of each other, thereby making the air suspension air circuit control pipeline simpler, more efficient and more stable.

[0021] The first solenoid valve 2 of the present invention is a two-position three-way solenoid valve. When the first solenoid valve 2 is opened, the first air inlet P on the first solenoid valve 2 is connected to the first air outlet B, and the first air inlet P on the first solenoid valve 2 is not connected to the first air outlet A. When the first solenoid valve 2 is closed, the first air inlet P on the first solenoid valve 2 is not connected to the first air outlet B, and the first air inlet P is connected to the first air outlet A; the second solenoid valve 3 is a normally closed solenoid valve. When the second solenoid valve 3 is normally closed, the second air inlet P on the second solenoid valve 3 is not connected to the second air outlet B. When the second solenoid valve 3 is opened, that is, when energized, the second air inlet P on the second solenoid valve 3 is connected to the second air outlet B. The height valve outlet 1 21 and the height valve outlet 2 22 of the present invention are connected in series with each other, that is, the air flows in the conventional load-bearing airbag 9 and the lifting load-bearing airbag 7 can flow to each other, so that after the lifting bridge falls and the air pressure in the conventional load-bearing airbag 9 and the lifting load-bearing airbag 7 is stable, the air pressure in the conventional load-bearing airbag 9 and the lifting load-bearing airbag 7 is the same.

[0022] The main problem to be solved by the present invention is that the load-bearing airbag on the lifting bridge becomes deflated and stretched during the process of the lifting bridge being lowered. At present, when the lifting bridge on the trailer is about to be lowered, it is necessary to first ensure that the trailer is in an empty or lightly loaded state, thereby preventing only two or three axles of the trailer from exerting force. At this time, due to the adjustment of the height valve 5, the air pressure value in the load-bearing airbag on the ordinary vehicle axle is very small. As a result, when the lifting bridge is lowered, the relay valve air inlet 1 is connected with the relay valve air outlet 2, and the airflow in the conventional load-bearing airbag 9 cannot quickly enter the lifting load-bearing airbag 7, and thus the deflated airbag cannot be quickly flushed up in a short time, causing the lifting load-bearing airbag 7 to become deflated and stretched. The present invention provides a second air pipe support Road 13 and the second solenoid valve 3, when the lifting bridge descends from the raised state, the second air pipe branch 13 supplies air to the lifting and bearing airbags 7 on both sides through the second solenoid valve 3 for 1-10 seconds, so that the lifting and bearing airbags 7 are quickly inflated. When the lifting bridge moves downward under the action of gravity and pulls the concave lifting and bearing airbags 7 to stretch downward, the lifting and bearing airbags 7 are quickly inflated for a certain period of time to become full, avoiding the lifting and bearing airbags 7 from being stretched when they are deflated, greatly increasing their service life by 2-3 times, fundamentally solving the problem of easy damage of the lifting and bearing airbags 7 on the lifting bridge, reducing maintenance costs and improving usage stability, which is of great significance to the popularization of lifting bridges in trailers.

[0023] The filter 10 is installed on the first air pipe 11 .

[0024] The filter 10 of the present invention can remove impurities in the gas.

[0025] The switch 8 includes a first relay and a second relay, the first relay is connected to the first solenoid valve 2 , and the second relay is a time delay relay and is connected to the second solenoid valve 3 .

[0026] The first relay and the second relay of the present invention are controlled by remote control, and when the first relay is de-energized, the second relay is energized.

[0027] The delay time of the second relay is 1-10 seconds.

[0028] The delay time of the second relay of the present invention can be reasonably set according to the air pressure and the airbag capacity.

Claims

1. A control method for an air suspension air circuit control system with a lifting airbag, the control system comprising an air reservoir (1), a first solenoid valve (2), a second solenoid valve (3), a lifting airbag (4), a height valve (5), a relay valve (6), a lifting load-bearing airbag (7), a switch (8) and a conventional load-bearing airbag (9), the air reservoir (1) being connected to a first air pipe branch (12), a second air pipe branch (13) and a third air pipe branch (14) respectively through a first air pipe (11), the first air pipe branch (12) being connected to a first air inlet P on a first solenoid valve (2), a first air outlet B on the first solenoid valve (2) being connected to lifting airbags (4) on both sides, and the first air pipe branch (12) being connected to a first air inlet P on a first solenoid valve (2), a first air outlet B on the first solenoid valve (2) being connected to lifting airbags (4) on both sides, and the second air pipe branch (13) being connected to a third air pipe branch (14) respectively through a first air pipe (11). An air outlet A is connected to the relay valve air inlet on the relay valve (6); the second air pipe branch (13) is connected to the second air inlet P on the second solenoid valve (3), and the second air outlet B on the second solenoid valve (3) is connected to the lifting load-bearing airbags (7) on both sides; the third air pipe branch (14) is connected to the height valve air inlet on the height valve (5), the height valve air outlet 1 (21) on the height valve (5) is connected to the conventional load-bearing airbag (9), and the height valve air outlet 2 (22) on the height valve (5) is connected to the relay valve air inlet, and the relay valve (6) is also provided with a relay valve air outlet and a relay valve exhaust port, and the relay valve air outlet is connected to the lifting load-bearing airbag (7); characterized in that The control method is as follows: during the lifting process of the lifting bridge: the switch (8) controls the first electromagnetic valve (2) to be opened and the second electromagnetic valve (3) to be normally closed; when the first electromagnetic valve (2) is opened, the first air inlet P on the first electromagnetic valve (2) is connected to the first air outlet B, the first air inlet P is not connected to the first air outlet A, and the high-pressure gas in the air storage cylinder (1) enters the lifting air bags (4) on both sides through the first air outlet B, and the lifting air bags (4) on both sides are inflated; at the same time, since the high-pressure gas passing through the first electromagnetic valve (2) cannot pass through the second electromagnetic valve (3), the high-pressure gas passing through the first electromagnetic valve (2) is inflated. An air outlet A enters the air inlet of the relay valve, so that the air inlet of the relay valve is not connected to the air outlet of the relay valve, and the air outlet of the relay valve is connected to the exhaust port of the relay valve. The high-pressure gas in the lifting and carrying airbags (7) on both sides is discharged through the exhaust port of the relay valve. When the second solenoid valve (3) is normally closed, the second air inlet P on the second solenoid valve (3) is not connected to the second air outlet B. When the lifting bridge is in the lifting state, the first solenoid valve (2) remains normally open and the second solenoid valve (3) remains normally closed. During the lowering process of the lifting bridge: the switch (8) The first solenoid valve (2) is controlled to be closed, and the second solenoid valve (3) is controlled to be energized. When the first solenoid valve (2) is closed, the first air inlet P on the first solenoid valve (2) is not connected to the first air outlet B, and the first air inlet P is connected to the first air outlet A. The lifting airbag (4) is exhausted through the exhaust port on the first solenoid valve (2). At the same time, the high-pressure gas in the first solenoid valve (2) enters the air inlet of the relay valve, so that the air inlet of the relay valve is connected to the air outlet of the relay valve, and the air outlet of the relay valve is not connected to the exhaust port of the relay valve. The airflow in the conventional load-bearing airbag (9) slowly enters the lifting load-bearing airbag (7). When the second solenoid valve (3) is energized, the second air inlet P on the second solenoid valve (3) is connected to the second air outlet B. The high-pressure gas passes through the second solenoid valve (3) and enters the lifting load-bearing airbag (7) to inflate the load-bearing airbag. The switch (8) controls the second solenoid valve (3) to close after opening for a certain period of time. When the lifting bridge is in the lowering state, the first solenoid valve (2) remains normally closed, and the second solenoid valve (3) remains normally closed.

2. The control method of the air suspension air circuit control system with a lifting airbag according to claim 1 is characterized in that: A filter (10) is installed on the first air pipe (11).

3. The control method of the air suspension air circuit control system with a lifting airbag according to claim 1 is characterized in that: The switch (8) comprises a first relay and a second relay, the first relay being connected to the first solenoid valve (2), and the second relay being a time delay relay and connected to the second solenoid valve (3).

4. The control method of the air suspension air circuit control system with a lifting airbag according to claim 3 is characterized in that: The delay time of the second relay is 1-10 seconds.

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