Snow sweeper hydro-pneumatic suspension and height adjusting method

Abstract

The invention provides a hydro-pneumatic suspension of a snow sweeper and a height adjusting method, and relates to the field of snow sweepers, the hydro-pneumatic suspension comprises a frame, a front axle and a rear axle are arranged on the frame, two ends of the front axle are respectively provided with a front hydro-pneumatic spring, each front hydro-pneumatic spring is communicated with an oil tank through a corresponding front control valve group, and the front control valve group is communicated with a rear control valve group. Rear hydro-pneumatic springs are arranged at the two ends of the rear axle respectively, each rear hydro-pneumatic spring communicates with the oil tank through a corresponding rear control valve set, and displacement sensors are arranged in the front hydro-pneumatic springs and the rear hydro-pneumatic springs; each front hydro-pneumatic spring is communicated with a corresponding front energy accumulator through a corresponding front valve I, and each rear hydro-pneumatic spring is communicated with a corresponding rear energy accumulator through a corresponding rear valve I; and the controller is electrically connected with the displacement sensor, the front control valve group, the front valve I, the rear valve I and the rear control valve group. The left and right heights of the frame can be consistent, and the snow removal effect of the airport runway is good.

Description

Technical Field

[0001] The invention relates to the field of snowplows, and in particular to an oil-gas suspension of a snowplow and a height adjustment method. Background Art

[0002] A snow removal mechanism (such as a snow pusher and snow removal roller) is installed on the snowplow, and the snowplow mechanism contacts the snow on the road to remove the snow. The chassis of the snowplow is mostly modified from ordinary commercial vehicles, and the chassis suspension system of commercial vehicles mostly uses leaf spring suspension. Although the leaf spring suspension has a simple structure, low cost, and the vibration reduction performance basically meets the vehicle requirements, the leaf spring suspension is a passive suspension and cannot freely adjust the vehicle body. During the snow removal process, when the snow on the road affects the passability, the chassis height needs to be adjusted, but the leaf spring suspension obviously does not meet the specific requirements of snowplow transportation, driving and equipment operation.

[0003] In the prior art, a Chinese utility model patent with authorization announcement number CN209441136U discloses an adjustable height suspension system, including a front suspension bracket, a rear suspension bracket and an ECU. The front suspension bracket is provided with a left front airbag, a right front airbag, a left front height sensor, a right front height sensor, a left front solenoid valve, a right front solenoid valve and a front axle central solenoid valve. The left front height sensor, the right front height sensor, the left front solenoid valve, the right front solenoid valve, the front axle central solenoid valve, the right rear height sensor, the left rear solenoid valve, the right rear solenoid valve, and the rear axle central solenoid valve are electrically connected to the ECU. The rear suspension bracket is provided with a left rear airbag, a right rear airbag, a right rear height sensor, a left rear solenoid valve, a right rear solenoid valve, a rear axle central solenoid valve, and an air source are all electrically connected to the ECU. The left front airbag is electrically connected to the air source through the left front solenoid valve, the right front airbag is electrically connected to the air source through the left front solenoid valve, the left rear airbag is electrically connected to the air source through the left rear solenoid valve, and the right rear airbag is electrically connected to the air source through the right rear solenoid valve. The ECU calculates and controls the inflation and deflation solenoid valves to centrally inflate and deflate all airbags to achieve the raising and lowering of the airbags, thereby achieving adjustable height of the vehicle.

[0004] In order to achieve better snow removal effect, the height of the frame from the ground is required to remain unchanged during operation. With the above technical solution, the air has a certain compressibility, which makes the suspension have a certain rigidity. When working on uneven snowy roads, high and low vibrations will occur, causing the left and right heights of the frame to be different, causing one end of the snow pusher and the snow removal roller brush to leave the ground, affecting the snow removal effect. Summary of the invention

[0005] In order to solve the technical problem in the above-mentioned prior art that the snowplow frame has a certain rigidity, which causes the left and right sides of the frame to be uneven and affects the snow removal effect, the present invention provides a snowplow oil-gas suspension and height adjustment method, which can ensure that the left and right heights of the frame are consistent during snow removal operations, thereby ensuring a better snow removal effect.

[0006] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a snowplow oil-gas suspension, including a frame, a front axle and a rear axle are arranged on the frame, front oil-gas springs are respectively arranged at both ends of the front axle, each of the front oil-gas springs is connected to the oil tank through a corresponding front control valve group, and rear oil-gas springs are respectively arranged at both ends of the rear axle, each of the rear oil-gas springs is connected to the oil tank through a corresponding rear control valve group, the front oil-gas springs and the rear oil-gas springs are both equipped with displacement sensors; each of the front oil-gas springs is connected to the corresponding front accumulator through a corresponding front valve one, and each of the rear oil-gas springs is connected to the corresponding rear accumulator through a corresponding rear valve one; and a controller is also included, and the controller is electrically connected to the displacement sensor, the front control valve group, the front valve one, the rear valve one and the rear control valve group.

[0007] Through the cooperation of the rear oil-gas spring, the front oil-gas spring, the front control valve group, the rear control valve group, the front valve one and the rear valve one, the present invention can control the front oil-gas spring and the rear oil-gas spring to be disconnected from the oil tank after being adjusted into place, and at the same time, the front valve one and the rear valve one disconnect the oil-gas spring and the accumulator, so as to realize the rigid locking of the oil-gas spring and keep the height of the vehicle frame from changing after being adjusted into place, thereby ensuring that the left and right heights of the vehicle frame are consistent when removing snow, and the snow pusher and the snow removal roller brush can maintain the force on the accumulated snow, thereby improving the snow removal effect.

[0008] Furthermore, the front control valve group and the rear control valve group both include an oil outlet speed regulating valve and an oil return speed regulating valve, the oil outlet of the return oil speed regulating valve is connected to the oil tank, the oil inlet of the return oil speed regulating valve is connected to the oil return port of the reversing valve group, the oil inlet of the oil outlet speed regulating valve is connected to the oil tank, the oil outlet of the oil outlet speed regulating valve is connected to the oil inlet of the reversing valve group, and the oil outlet of the reversing valve group is connected to the front oil-gas spring or the rear oil-gas spring.

[0009] The present invention can adjust the oil outlet and oil return flow rates by arranging an oil outlet speed regulating valve and an oil return speed regulating valve, so that the oil outlet speed and the oil return speed on the four oil circuits are the same, and the two front oil-gas springs and the two rear oil-gas springs are raised and lowered synchronously as much as possible, thereby avoiding the risk of the frame rolling over and reducing the torsional effect on the frame when adjusting the frame height, thereby reducing the impact on the service life of the frame.

[0010] Furthermore, the reversing valve group includes a reversing valve 1 and a reversing valve 2 connected in series, and both the reversing valve 1 and the reversing valve 2 adopt a two-position three-way electromagnetic reversing valve. The reversing valve 1 is in a normally closed state, and the oil outlet of the reversing valve 1 is connected to the front oil-gas spring or the rear oil-gas spring, and the oil return port of the reversing valve 2 is connected to the oil inlet of the return oil speed regulating valve.

[0011] The present invention can greatly reduce the risk of internal leakage of the reversing valve group and avoid affecting the vehicle posture by connecting the reversing valve 1 and the reversing valve 2 in series.

[0012] Furthermore, the rear valve 1 and the front valve 1 both adopt two-position two-way solenoid valves, and both are in a normally open state.

[0013] The present invention enables the front and rear oil-gas springs to be connected to the corresponding accumulators by setting the rear valve 1 and the front valve 1 to be in a normally open state, thereby achieving buffering and vibration reduction and improving driving comfort.

[0014] Furthermore, it also includes an oil supply component, which includes an oil supply pipe and an oil return pipe. The oil supply pipe is connected to the oil inlets of the front control valve group and the rear control valve group respectively, and the oil return pipe is connected to the oil return ports of the front control valve group and the rear control valve group respectively. The oil supply pipe and the oil return pipe are connected through an oil return bypass. A safety valve is provided on the oil return bypass, and the safety valve is connected toward the oil return pipe. The safety valve is in a normally closed state. A pressure alarm is provided on the oil supply line, and the pressure alarm, the safety valve and the controller are electrically connected.

[0015] The invention can prevent the input of oil with abnormal pressure into the front control valve group and the rear control valve group by arranging a safety valve and a bypass on the oil supply assembly, thereby preventing the hydraulic components from being damaged.

[0016] Furthermore, the oil supply assembly also includes a one-way valve, and the one-way valve is arranged on the oil supply pipe.

[0017] The invention prevents oil from flowing back from the oil supply pipe by arranging a one-way valve.

[0018] Furthermore, an overflow pipe is connected between the oil supply pipe and the oil return pipe, and an overflow valve is arranged on the overflow pipe.

[0019] The present invention also provides a method for adjusting the height of a snowplow oil-gas suspension, which uses the above-mentioned snowplow oil-gas suspension and includes the following steps:

[0020] S01: according to the road conditions, the frame height is set, and the controller converts the set frame height into the elongation of two front oil-gas springs and two rear oil-gas springs;

[0021] S02: Open the front control valve group and the rear control valve group, the front oil-gas spring and the rear oil-gas spring are extended according to the calculated elongation, and after being adjusted into place, the front valve 1 and the rear valve 1 are closed.

[0022] Furthermore, in S02, the front oil-gas spring and the rear oil-gas spring are controlled to extend synchronously.

[0023] The present invention controls the front and rear oil-gas springs to extend synchronously, and forms a double insurance with the oil outlet speed regulating valve and the oil return speed regulating valve. From the perspective of control, the influence of valve leakage or blockage on the extension of the oil-gas spring is avoided, and the risk of the frame tipping over when the frame is raised is avoided. The torque effect on the frame when the frame height is adjusted is reduced, which affects the service life of the frame.

[0024] Furthermore, the S02 includes the following steps: during the extension of the front and rear oil-gas springs, the four displacement sensors detect the extension distances of the corresponding oil-gas springs at set intervals, and compare the four extension distances. If it is found that the difference between the four extension distances exceeds the set threshold, the oil-gas spring at the maximum extension distance L1 is controlled to stop extending, and the other three oil-gas springs are controlled to continue extending until the differences between the four extension distances are all less than the set threshold, and the front and rear oil-gas springs are extended together again; when controlling the extension of the other three oil-gas springs, the three corresponding displacement sensors detect the extension distances of the corresponding oil-gas springs at set intervals, and compare the three extension distances. If it is found that the difference between the three extension distances exceeds the set threshold, the maximum extension distance is controlled The oil and gas spring at L2 stops extending, and the other two oil and gas springs are controlled to continue to extend until the difference between the three extension distances is less than the set threshold value. The three oil and gas springs are then extended together, and the three extension distances are constantly compared with L1 until the difference between them is less than the set threshold value. When controlling the extension of the other two oil and gas springs, the two corresponding displacement sensors detect the extension distances of the corresponding oil and gas springs at a set interval, and compare the two extension distances. If it is found that the difference between the two extension distances exceeds the set threshold value, the oil and gas spring at the maximum extension distance L3 is controlled to stop working, and the other oil and gas springs are controlled to continue to extend until the difference between the two extension distances is less than the set threshold value. The two oil and gas springs are then extended together, and the two extension distances are constantly compared with L2 until the difference between them is less than the set threshold value.

[0025] The present invention controls the elongation of corresponding oil-gas springs in groups according to the elongation distance, so that the elongation difference of the four oil-gas springs can be kept within a set threshold, ensuring that the four oil-gas springs are synchronously extended within a certain synchronization error, which is convenient for control and adjustment.

[0026] It can be seen from the above technical solutions that the present invention has the following advantages:

[0027] The invention provides an oil-gas suspension and height adjustment method for a snowplow vehicle. Through the cooperation of a rear oil-gas spring, a front oil-gas spring, a front control valve group, a rear control valve group, a front valve one and a rear valve one, the front oil-gas spring and the rear oil-gas spring can be controlled to be disconnected from the oil tank after being adjusted to the right position. At the same time, the front valve one and the rear valve one disconnect the connection between the oil-gas spring and the accumulator, so as to realize the rigid locking of the oil-gas spring and keep the height of the vehicle frame from changing after being adjusted to the right position, so as to ensure that the left and right heights of the vehicle frame are consistent during snow removal, and the snow pusher and the snow removal roller brush can maintain the force on the accumulated snow, thereby improving the snow removal effect. By arranging an oil outlet speed regulating valve and an oil return speed regulating valve, the oil outlet and oil return flow rates can be adjusted so that the oil outlet speed and the oil return speed on the four oil circuits are the same, so that the two front oil-gas springs and the two rear oil-gas springs can be raised and lowered synchronously as much as possible, so as to avoid the risk of the vehicle frame rolling over and reduce the torsional effect on the frame when adjusting the height of the frame, thereby affecting the service life of the frame. By connecting the reversing valve one and the reversing valve two in series, The risk of internal leakage of the reversing valve group is greatly reduced to avoid affecting the vehicle posture; by setting the rear valve 1 and the front valve 1 to the normally open state, the front and rear oil-gas springs can be connected to the corresponding accumulators to achieve buffering and vibration reduction, and improve driving comfort; by setting a safety valve and a bypass on the oil supply assembly, it is possible to avoid the input of oil with abnormal pressure to the front control valve group and the rear control valve group, thereby avoiding damage to the hydraulic components; by controlling the synchronous extension of the front oil-gas spring and the rear oil-gas spring, from the perspective of control, a double insurance is formed with the oil outlet speed regulating valve and the oil return speed regulating valve to avoid the influence of valve leakage or blockage on the extension of the oil-gas spring, avoid the risk of the frame rolling over when the frame is raised, and reduce the torque on the frame when the frame height is adjusted, which affects the service life of the frame; by controlling the extension of the corresponding oil-gas springs in groups according to the extension distance, the extension difference of the four oil-gas springs can be kept within the set threshold, ensuring that the four oil-gas springs extend synchronously within a certain synchronization error, which is easy to control and adjust. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solution of the present invention, the accompanying drawings required for use in the description will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0029] Figure 1 This is a hydraulic principle diagram of a specific implementation mode 1 of the present invention.

[0030] Figure 2 It is a schematic structural diagram of the front valve 1 or the rear valve 1 in the specific implementation mode 1 of the present invention.

[0031] Figure 3 It is a hydraulic principle diagram of the front reversing valve group or the rear reversing valve group in the first specific implementation mode of the present invention.

[0032] Figure 4 This is a hydraulic principle diagram of the oil supply assembly in the first specific implementation mode of the present invention.

[0033] Figure 5 This is a flow chart of S02 in the second specific implementation mode of the present invention.

[0034] In the figure, 1. oil tank; 4. oil supply assembly; 41. overflow valve; 42. safety valve; 43. check valve; 44. pressure alarm; 6. front control valve group; 61. reversing valve 2; 62. reversing valve 1; 63. return oil speed regulating valve; 64. oil outlet speed regulating valve; 7. rear control valve group; 8. front valve 1; 10. rear valve 1; 12. accumulator; 16. front oil-gas spring; 18. rear oil-gas spring. DETAILED DESCRIPTION

[0035] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in this specific embodiment. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of them. Based on the embodiments in this patent, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this patent. Specific implementation method 1

[0037] like Figure 1 As shown, this specific embodiment provides a snowplow oil-gas suspension, including a frame, on which a front axle and a rear axle are arranged, front oil-gas springs 16 are respectively arranged at both ends of the front axle, each front oil-gas spring 16 is connected to the oil tank 1 through a corresponding front control valve group 6, and rear oil-gas springs 18 are respectively arranged at both ends of the rear axle, each rear oil-gas spring 18 is connected to the oil tank 1 through a corresponding rear control valve group 7, and the front oil-gas springs 16 and the rear oil-gas springs 18 are both equipped with displacement sensors; each front oil-gas spring 16 is connected to the corresponding front accumulator 12 through a corresponding front valve 8, and each rear oil-gas spring 18 is connected to the corresponding rear accumulator 12 through a corresponding rear valve 10; and a controller is also included, and the controller is electrically connected to the displacement sensor, the front control valve group 6, the front valve 8, the rear valve 10 and the rear control valve group 7.

[0038] Through the coordination of the rear oil-gas spring 18, the front oil-gas spring 16, the front control valve group 6, the rear control valve group 7, the front valve 18 and the rear valve 10, this specific embodiment can control the front oil-gas spring 16 and the rear oil-gas spring 18 to be disconnected from the oil tank 1 after being adjusted into place, and at the same time, the front valve 18 and the rear valve 10 disconnect the oil-gas spring from the accumulator 12, thereby realizing the rigid locking of the oil-gas spring and keeping the frame height from changing after being adjusted into place, ensuring that the left and right heights of the frame are consistent when removing snow, and the snow pusher and the snow removal roller brush can maintain the force on the accumulated snow, thereby improving the snow removal effect.

[0039] like Figure 2 As shown, in this specific embodiment, the rear valve 10 and the front valve 8 both use two-position two-way solenoid valves, and are both in a normally open state, which can connect the front and rear oil-gas springs 18 with the corresponding accumulators 12 to achieve buffering and vibration reduction, and improve driving comfort (when not working in snow removal).

[0040] like Figure 3 As shown, in order to ensure that the two front oil-gas springs 16 and the two rear oil-gas springs 18 rise and fall synchronously, the front control valve group 6 and the rear control valve group 7 both include an oil outlet speed regulating valve 64 and an oil return speed regulating valve 63. The oil outlet of the oil return speed regulating valve 63 is connected to the oil tank 1, the oil inlet of the oil return speed regulating valve 63 is connected to the oil return port of the reversing valve group, the oil inlet of the oil outlet speed regulating valve 64 is connected to the oil tank 1, the oil outlet of the oil outlet speed regulating valve 64 is connected to the oil inlet of the reversing valve group, and the oil outlet of the reversing valve group is connected to the The front oil-gas spring 16 or the rear oil-gas spring 18 is connected; by setting the oil outlet speed regulating valve 64 and the oil return speed regulating valve 63, the oil outlet and oil return flow rates can be adjusted to make the oil outlet speed and oil return speed on the four oil circuits the same. From the perspective of hydraulic control, the two front oil-gas springs 16 and the two rear oil-gas springs 18 can be raised and lowered synchronously to avoid unbalanced force on the left and right sides of the frame, the risk of rollover, and reduce the torque on the frame when adjusting the frame height, affecting the service life of the frame.

[0041] like Figure 3As shown, in the prior art, two parallel reversing valves are often used to communicate with the oil tank 1, one for oil supply and the other for oil return. The return oil pressure of the reversing valve for oil return is zero, which is easy to cause oil leakage. To avoid this technical problem, in this specific embodiment, the reversing valve group includes a reversing valve 1 62 and a reversing valve 2 61 connected in series. The reversing valve 1 62 and the reversing valve 2 61 both use a two-position three-way electromagnetic reversing valve. The reversing valve 1 62 is in a normally closed state. The oil outlet of the reversing valve 1 62 is The oil return port of the reversing valve 61 is connected with the front oil-gas spring 16 or the rear oil-gas spring 18, and the oil return port of the reversing valve 61 is connected with the oil inlet of the return oil speed regulating valve 63. After this arrangement, the oil that refluxes and leaks internally needs to pass through the reversing valve 1 62 to reach the reversing valve 61 to the oil tank 1. However, during normal oil supply, the oil port pressure of the reversing valve 61 is relatively high, and the oil pressure is relatively low, making it difficult to flow back from here. Therefore, the occurrence of internal leakage is greatly reduced, ensuring the pressure of the entire system and avoiding affecting the vehicle posture.

[0042] like Figure 4 As shown, this specific embodiment also includes an oil supply component 4. Due to the lack of experience of the operator, there may be misoperation. In the snow removal mode of the snowplow, the operator may mistakenly step on the accelerator and increase the oil output pressure, which will cause great damage to the hydraulic components. To avoid this phenomenon, in this specific embodiment, the oil supply component 4 includes an oil supply pipe and an oil return pipe. The oil supply pipe is connected to the oil inlets of the front control valve group 6 and the rear control valve group 7 respectively, and the oil return pipe is connected to the oil return ports of the front control valve group 6 and the rear control valve group 7 respectively. The oil supply pipe and the oil return pipe are connected through an oil return bypass. A safety valve 42 is provided on the oil return bypass. The safety valve 42 is connected to the oil return pipe. The safety valve 42 is in a normally closed state. A pressure alarm 44 is provided on the oil supply line. The pressure alarm 44 and the safety valve 42 are electrically connected to the controller. The oil supply component 4 also includes a one-way valve 43. The one-way valve 43 is provided on the oil supply pipe. An overflow pipe is also connected between the oil supply pipe and the oil return pipe, and an overflow valve 41 is provided on the overflow pipe. By arranging a safety valve 42 and a bypass on the oil supply assembly 4, when the oil pressure is too high, the safety valve 42 opens, connects through the return oil bypass, and returns to the oil tank 1, thereby avoiding the input of abnormal pressure oil to the front control valve group 6 and the rear control valve group 7, avoiding damage to the hydraulic components. Specific implementation method 2

[0044] This specific embodiment provides a method for adjusting the height of a snowplow oil-gas suspension, using the snowplow oil-gas suspension of the specific embodiment 1, including the following steps:

[0045] S01: according to the road conditions, the frame height is set, and the controller converts the set frame height into the elongation of two front oil-gas springs and two rear oil-gas springs;

[0046] S02: Open the front control valve group and the rear control valve group, the front oil-gas spring and the rear oil-gas spring are extended according to the calculated elongation, and after being adjusted into place, the front valve 1 and the rear valve 1 are closed.

[0047] In S02, the front and rear oil-gas springs are controlled to extend synchronously.

[0048] Due to the long-term use of hydraulic components such as valves and pipelines, there are leakages, blockages and other phenomena, which makes it impossible to ensure the synchronization of the lifting and lowering of the front and rear oil-gas springs, resulting in the risk of rollover of the vehicle body. For this reason, the present specific implementation method controls the synchronous extension of the front and rear oil-gas springs, and forms a double insurance with the oil outlet speed regulating valve and the oil return speed regulating valve. From the perspective of control, the influence of valve leakage or blockage on the extension of the oil-gas spring is avoided, the risk of rollover of the frame when the frame is raised is avoided, and the torque on the frame when the frame height is adjusted is reduced, which affects the service life of the frame.

[0049] like Figure 5 As shown, S02 includes the following steps: during the extension of the front oil-gas spring and the rear oil-gas spring, the four displacement sensors detect the extension distances of the corresponding oil-gas springs at set intervals, and compare the four extension distances. If it is found that the difference between the four extension distances exceeds the set threshold, the oil-gas spring at the maximum extension distance L1 is controlled to stop extending, and the other three oil-gas springs are controlled to continue extending until the differences between the four extension distances are all less than the set threshold, and the front oil-gas spring and the rear oil-gas spring are extended together again; when controlling the extension of the other three oil-gas springs, the three corresponding displacement sensors detect the extension distances of the corresponding oil-gas springs at set intervals, and compare the three extension distances. If it is found that the difference between the three extension distances exceeds the set threshold, the oil-gas spring at the maximum extension distance L1 is controlled to stop extending. 2 stops extending, and controls the other two oil-gas springs to continue extending, until the difference between the three extension distances is less than the set threshold value, and the three oil-gas springs extend together again, and the three extension distances are constantly compared with L1, until the difference between them is less than the set threshold value; when controlling the extension of the other two oil-gas springs, the two corresponding displacement sensors detect the extension distances of the corresponding oil-gas springs at a set interval, and compare the two extension distances. If it is found that the difference between the two extension distances exceeds the set threshold value, the oil-gas spring at the maximum extension distance L3 is controlled to stop working, and the other oil-gas springs are controlled to continue extending, until the difference between the two extension distances is less than the set threshold value, and the two oil-gas springs extend together again, and the two extension distances are constantly compared with L2, until the difference between them is less than the set threshold value.

[0050] It can be understood that when descent is required, the four gas springs (including two front gas springs and two rear gas springs) are retracted in the opposite steps to those when extended, and no further details are given.

[0051] This specific implementation method controls the extension of the corresponding oil and gas springs in groups according to the extension distance, so that the extension difference of the four oil and gas springs can be maintained within the set threshold value, ensuring that the four oil and gas springs extend synchronously within a certain synchronization error, which is easy to control and adjust, and avoids adverse forces on the frame during the extension process, and even causing the vehicle to roll over. From the perspective of the control method, this specific implementation method cooperates with the oil outlet speed regulating valve 64 and the oil return speed regulating valve 63 to achieve the technical effect of smooth lifting and lowering.

[0052] From the above specific implementations, it can be seen that the present invention has the following beneficial effects:

[0053] 1. Through the cooperation of the rear oil-gas spring, the front oil-gas spring, the front control valve group, the rear control valve group, the front valve 1 and the rear valve 1, after being adjusted in place, the front oil-gas spring and the rear oil-gas spring can be controlled to be disconnected from the oil tank, and at the same time, the front valve 1 and the rear valve 1 disconnect the oil-gas spring and the accumulator, so as to realize the rigid locking of the oil-gas spring, keep the height of the frame from changing after being adjusted in place, ensure that the left and right heights of the frame are consistent when snow is removed, and the snow pusher and snow removal roller brush can maintain the force on the accumulated snow, thereby improving the snow removal effect;

[0054] 2. By setting the oil outlet speed regulating valve and the oil return speed regulating valve, the oil outlet and oil return flow rates can be adjusted to make the oil outlet speed and oil return speed on the four oil lines the same, so that the two front oil-gas springs and the two rear oil-gas springs can be raised and lowered synchronously as much as possible to avoid the risk of the frame rolling over and reduce the torque effect on the frame when adjusting the frame height, which affects the service life of the frame;

[0055] 3. By connecting reversing valve 1 and reversing valve 2 in series, the risk of internal leakage of the reversing valve group can be greatly reduced to avoid affecting the vehicle posture;

[0056] 4. By setting the rear valve 1 and the front valve 1 to a normally open state, the front and rear oil and gas springs can be connected to the corresponding accumulators to achieve buffering and vibration reduction, thereby improving driving comfort (not snow removal);

[0057] 5. By setting a safety valve and bypass on the oil supply assembly, it is possible to avoid the input of abnormal pressure oil to the front control valve group and the rear control valve group, thereby avoiding damage to the hydraulic components;

[0058] 6. The front and rear oil-gas springs are controlled to extend synchronously. From the perspective of control, they form a double insurance with the oil outlet speed regulating valve and the oil return speed regulating valve to avoid the influence of valve leakage or blockage on the extension of the oil-gas spring, avoid the risk of the frame rolling over when the frame is raised, and reduce the torque effect on the frame when adjusting the frame height, which affects the service life of the frame;

[0059] 7. By controlling the elongation of the corresponding oil-gas springs in groups according to the elongation distance, the elongation difference of the four oil-gas springs can be kept within the set threshold, ensuring that the four oil-gas springs are elongated synchronously within a certain synchronization error, which is convenient for control and adjustment.

[0060] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A snowplow oil-gas suspension, comprising a frame, on which a front axle and a rear axle are arranged, characterized in that: Front oil-gas springs (16) are respectively arranged at both ends of the front axle, and each of the front oil-gas springs (16) is connected to the oil tank (1) through a corresponding front control valve group (6); rear oil-gas springs (18) are respectively arranged at both ends of the rear axle, and each of the rear oil-gas springs (18) is connected to the oil tank (1) through a corresponding rear control valve group (7); and the front oil-gas springs (16) and the rear oil-gas springs (18) are both equipped with displacement sensors; Each of the front oil-gas springs (16) is connected to a corresponding front accumulator (12) via a corresponding front valve (8), and each of the rear oil-gas springs (18) is connected to a corresponding rear accumulator (12) via a corresponding rear valve (10); It also includes a controller, which is electrically connected to the displacement sensor, the front control valve group (6), the front valve one (8), the rear valve one (10) and the rear control valve group (7).

2. The snowplow oil-gas suspension according to claim 1, characterized in that: The front control valve group (6) and the rear control valve group (7) both comprise an oil outlet speed regulating valve (64) and an oil return speed regulating valve (63); the oil outlet of the oil return speed regulating valve (63) is connected to the oil tank (1); the oil inlet of the oil return speed regulating valve (63) is connected to the oil return port of the reversing valve group; the oil inlet of the oil outlet speed regulating valve (64) is connected to the oil tank (1); the oil outlet of the oil outlet speed regulating valve (64) is connected to the oil inlet of the reversing valve group; and the oil outlet of the reversing valve group is connected to the front oil-gas spring (16) or the rear oil-gas spring (18).

3. The oil-gas suspension for snowplows according to claim 2, characterized in that: The reversing valve group comprises a reversing valve 1 (62) and a reversing valve 2 (61) connected in series. Both the reversing valve 1 (62) and the reversing valve 2 (61) are two-position three-way electromagnetic reversing valves. The reversing valve 1 (62) is in a normally closed state. The oil outlet of the reversing valve 1 (62) is connected to the front oil-gas spring (16) or the rear oil-gas spring (18), and the oil return port of the reversing valve 2 (61) is connected to the oil inlet of the oil return speed regulating valve (63).

4. The snowplow oil-gas suspension according to claim 3, characterized in that: The rear valve 1 (10) and the front valve 1 (8) are both two-position two-way solenoid valves, and are both in a normally open state.

5. The snowplow oil-gas suspension according to any one of claims 1 to 4, characterized in that: The invention also comprises an oil supply assembly (4), wherein the oil supply assembly (4) comprises an oil supply pipe and an oil return pipe, wherein the oil supply pipe is respectively connected to the oil inlets of the front control valve group (6) and the rear control valve group (7), and the oil return pipe is respectively connected to the oil return ports of the front control valve group (6) and the rear control valve group (7). The oil supply pipe is connected to the oil return pipe via an oil return bypass, and a safety valve (42) is provided on the oil return bypass. The safety valve (42) is connected to the oil return pipe, and the safety valve (42) is in a normally closed state. A pressure alarm (44) is provided on the oil supply line, and the pressure alarm (44) and the safety valve (42) are electrically connected to the controller.

6. The oil-pneumatic suspension for snowplows according to claim 5, characterized in that: The oil supply assembly (4) further comprises a one-way valve (43), and the one-way valve (43) is arranged on the oil supply pipe.

7. The snowplow oil-pneumatic suspension according to claim 6, characterized in that: An overflow pipe is also connected between the oil supply pipe and the oil return pipe, and an overflow valve (41) is arranged on the overflow pipe.

8. A method for adjusting the height of a snowplow oil-gas suspension, characterized in that: The use of the oil-gas suspension for snow removal vehicles as claimed in claim 7 comprises the following steps: S01: according to the road conditions, the frame height is set, and the controller converts the set frame height into the elongation of two front oil-gas springs and two rear oil-gas springs; S02: Open the front control valve group and the rear control valve group, the front oil-gas spring and the rear oil-gas spring are extended according to the calculated elongation, and after being adjusted into place, the front valve 1 and the rear valve 1 are closed.

9. The method for adjusting the height of the oil-gas suspension of a snowplow according to claim 8, characterized in that: In S02, the front and rear oil-gas springs are controlled to extend synchronously.

10. The method for adjusting the height of the oil-gas suspension of a snowplow according to claim 9, characterized in that: The S02 comprises the following steps: During the extension of the front and rear oil-gas springs, the four displacement sensors detect the extension distances of the corresponding oil-gas springs at set time intervals, and compare the four extension distances. If it is found that the difference between the four extension distances exceeds the set threshold, the oil-gas spring at the maximum extension distance L1 is controlled to stop extending, and the other three oil-gas springs are controlled to continue extending. After the differences between the four extension distances are all less than the set threshold, the front and rear oil-gas springs are extended together again; when controlling the extension of the other three oil-gas springs, the three corresponding displacement sensors detect the extension distances of the corresponding oil-gas springs at set time intervals, and compare the three extension distances. If it is found that the difference between the three extension distances exceeds the set threshold, the oil-gas spring at the maximum extension distance L2 is controlled. Stop extending, and control the other two oil and gas springs to continue to extend until the difference between the three extension distances is less than the set threshold value. The three oil and gas springs are then extended together, and the three extension distances are constantly compared with L1 until the difference between them is less than the set threshold value. When controlling the extension of the other two oil and gas springs, the two corresponding displacement sensors detect the extension distances of the corresponding oil and gas springs at a set interval, and compare the two extension distances. If it is found that the difference between the two extension distances exceeds the set threshold value, the oil and gas spring at the maximum extension distance L3 is controlled to stop working, and the other oil and gas springs are controlled to continue to extend until the difference between the two extension distances is less than the set threshold value. The two oil and gas springs are then extended together, and the two extension distances are constantly compared with L2 until the difference between them is less than the set threshold value.

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