Damping system

Abstract

The utility model relates to the field of hydraulic control and suspension damping, in particular to a damping system. A damping system includes: an oil cylinder; the energy accumulator group comprises at least two energy accumulators, the at least two energy accumulators are located at different pressure grades, and the energy accumulators are communicated with the oil cylinder; and the travel switch monitors the travel of the oil cylinder so as to control the oil cylinder to be communicated with the energy accumulator of the corresponding pressure grade. According to one embodiment of the utility model, the energy accumulator group comprises a high-pressure energy accumulator and a medium-pressure energy accumulator, and both the high-pressure energy accumulator and the medium-pressure energy accumulator are communicated with a rodless cavity of the oil cylinder. The technical problems that in the prior art, a suspension hydraulic system cannot adapt to different pressure grades, and the load range of a suspension system is small are solved.

Description

Technical Field

[0001] The utility model relates to the fields of hydraulic control and suspension shock absorption, and in particular to a shock absorption system. Background Art

[0002] With the development of industrial applications, suspension and shock absorption systems are becoming increasingly common in various vehicles and mechanical equipment. Suspension systems absorb bumps and unevenness in the road, reducing the vibration transmitted to the load, and protecting the safety of the vehicle and cargo. Currently, two common suspension and shock absorption methods are mechanical springs and gas springs. Mechanical springs inherently have low damping, which can lead to an increased transmission ratio at resonant frequencies, thereby amplifying the effects of vibration. Furthermore, mechanical spring structures can suffer performance degradation due to improper design or prolonged use, such as spring fatigue, deformation, or damage. In contrast, gas springs can vary their damping based on gas pressure, effectively filtering bumps and absorbing vibrations. However, when subjected to large load variations, the gas pressure varies widely, and the compression ratio of the cylinder bladder increases, significantly reducing the life of the cylinder bladder.

[0003] For example, the document with publication number CN110594349A discloses a suspension hydraulic system comprising: a first oil tank for containing oil; a suspension cylinder for vibration reduction, the suspension cylinder having a rod chamber and a rodless chamber; a one-way valve, the outlet and inlet of the one-way valve respectively communicating with the rod chamber and the first oil tank; a damping valve, the two ends of the damping valve respectively communicating with the rod chamber and the first oil tank; and an accumulator communicating with the rodless chamber via a first pipeline. When the rod chamber contracts, the oil in the rod chamber flows through the damping valve into the first oil tank for heat exchange, and when the rod chamber expands, the oil in the first oil tank flows through the one-way valve into the rod chamber. The accumulator is connected to the rodless chamber, so that when the rodless chamber is compressed by an impact, the oil in the rodless chamber flows into the accumulator through the first pipeline, allowing the piston rod to quickly retract. After the impact, the oil flows back from the accumulator into the rodless chamber, restoring the rodless chamber and maintaining vehicle stability.

[0004] The suspension hydraulic system in the above document is connected to the accumulator through the rodless chamber, which can achieve a certain buffering and shock-absorbing effect. However, there is only one accumulator, which cannot adapt to different pressure levels, and the load range of the suspension system is small. Utility Model Content

[0005] In order to solve the technical problems in the prior art that the suspension hydraulic system cannot adapt to different pressure levels and the load range of the suspension system is small, the utility model provides a shock absorption system to solve the above technical problems.

[0006] In order to solve the above technical problems, the utility model provides a shock absorption system, comprising:

[0007] Oil cylinder;

[0008] an accumulator group, the accumulator group comprising at least two accumulators, the at least two accumulators being at different pressure levels, the accumulators being in communication with the oil cylinder;

[0009] A travel switch monitors the travel of the oil cylinder and controls the oil cylinder to communicate with an accumulator of a corresponding pressure level.

[0010] According to one embodiment of the present invention, the accumulator group includes a high-pressure accumulator and a medium-pressure accumulator, and both the high-pressure accumulator and the medium-pressure accumulator are communicated with the rodless chamber of the oil cylinder.

[0011] According to one embodiment of the present utility model, it also includes a first solenoid valve and a second solenoid valve, the first solenoid valve controls the on-off connection between the high-pressure accumulator and the oil cylinder, the second solenoid valve controls the on-off connection between the medium-pressure accumulator and the oil cylinder, and the travel switch controls the states of the first solenoid valve and the second solenoid valve.

[0012] According to an embodiment of the present invention, the piston rod of the oil cylinder triggers the travel switch, and the travel switch sends signals when reaching different position points to control the power on and off of the first solenoid valve and the second solenoid valve.

[0013] According to one embodiment of the present utility model, the position point includes a medium pressure position point and a high pressure position point, the medium pressure position point is higher than the high pressure position point, and when the travel switch reaches the medium pressure position point, it sends a medium pressure position signal to control the second solenoid valve to be in the disconnected state; when the travel switch reaches the high pressure position point, it sends a medium pressure position signal and a high pressure position signal to control the first solenoid valve to be in the disconnected state.

[0014] According to an embodiment of the present invention, a support plate is provided on the piston rod of the oil cylinder, and the piston rod triggers the travel switch through the support plate.

[0015] According to one embodiment of the present invention, a low-pressure accumulator is further included, and the low-pressure accumulator is communicated with the oil cylinder.

[0016] According to one embodiment of the present utility model, the low-pressure accumulator is connected to the rodless chamber of the cylinder through a first oil passage, a one-way valve is provided on the first oil passage, and the low-pressure accumulator replenishes oil to the rodless chamber of the cylinder through the one-way valve.

[0017] According to one embodiment of the present utility model, the low-pressure accumulator is connected to the rodless chamber of the oil cylinder through a second oil passage, and a relief valve is provided on the second oil passage.

[0018] According to one embodiment of the present invention, a pump is further included, wherein the pump supplies oil to the oil cylinder and the accumulator group to adjust the initial position of the piston rod of the oil cylinder.

[0019] Based on the above technical solution, the technical effects that can be achieved by the present invention are:

[0020] The shock absorption system of the present invention is provided with an accumulator group including at least two accumulators, so that when the oil cylinder is loaded, different accumulators can be connected to the corresponding accumulators for shock absorption according to the load, which can adapt to different pressure levels and has a wide load range. In addition, by providing a travel switch to automatically control the oil cylinder to connect with the accumulator of the corresponding pressure level according to the stroke of the oil cylinder, automatic control can be achieved.

[0021] The shock absorption system of the present invention is provided with an accumulator group including a high-pressure accumulator and a medium-pressure accumulator, and a first solenoid valve and a second solenoid valve are provided to control the on-off between the oil cylinder and the high-pressure accumulator, and the oil cylinder and the low-pressure accumulator, respectively. In this way, the travel switch only needs to control the power on and off of the first solenoid valve and the second solenoid valve to achieve the effect of automatic control;

[0022] In the shock absorption system of the present invention, a support plate is provided at the telescopic end of the oil cylinder, which is used to support the load. The piston rod of the oil cylinder under the support plate will retract downward. When the load is small and the travel switch has not reached the medium pressure position point, no signal is generated, and the first solenoid valve and the second solenoid valve are both in the connected state. The rodless chamber of the oil cylinder is connected with the high-pressure accumulator and the medium-pressure accumulator. At this time, the medium-pressure accumulator plays a shock absorption role for the oil cylinder; when the load is large, the support plate triggers the travel switch to the medium pressure position point, and the travel switch sends a medium-pressure position signal to control the second solenoid valve to be in the disconnected state. At this time, the first solenoid valve is still in the connected state, and the high-pressure accumulator plays a shock absorption role for the oil cylinder; when the load is overloaded, the support plate triggers the travel switch to the high pressure position point, and the travel switch sends a medium-pressure position signal and a high-pressure position signal to control the second solenoid valve to be in the disconnected state. At this time, the first solenoid valve and the second solenoid valve are both in the disconnected state, and the oil cylinder is supported by the back pressure of the relief valve, which can protect the oil cylinder and the accumulator; when the load exceeds the set value of the relief valve, the excess pressure shock is absorbed. The process automatically adjusts as the load changes, without the need for manual control;

[0023] The shock absorption system of the present invention is also provided with a low-pressure accumulator, which can replenish oil to the rodless chamber of the oil cylinder in a one-way manner, thereby protecting the system; an overflow valve is also provided between the low-pressure accumulator and the rodless chamber. When the load exceeds the set value of the overflow valve, the rodless chamber of the oil cylinder can release pressure to the low-pressure accumulator through the overflow valve, thereby preventing the system pressure from being too high. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a hydraulic principle diagram of the shock absorption system of the utility model;

[0025] In the figure: 1-oil cylinder; 11-piston rod; 2-accumulator group; 21-high-pressure accumulator; 22-medium-pressure accumulator; 23-low-pressure accumulator; 3-travel switch; 31-medium-pressure position signal; 32-high-pressure position signal; 41-first solenoid valve; 42-second solenoid valve; 5-support plate; 61-first oil channel; 62-second oil channel; 7-check valve; 8-overflow valve; 9-pump. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0028] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0029] In the description of the present invention, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0030] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0031] In addition, it should be noted that the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of this utility model.

[0032] like Figure 1 As shown, this embodiment provides a shock absorption system, including a cylinder 1, an accumulator group 2 and a limit switch 3. The cylinder 1 is used for load, the accumulator group 2 includes at least two accumulators, and the at least two accumulators are at different pressure levels. The limit switch 3 monitors the stroke of the cylinder 1 to control the cylinder 1 to communicate with the accumulator of the corresponding pressure level.

[0033] The oil cylinder 1 can be placed vertically and includes a piston rod 11. The outer end of the piston rod 11 extends and retracts vertically. A support plate 5 is provided at the top of the piston rod 11 to support the load. Specifically, the lower surface of the support plate 5 is fixed to the piston rod 11 of the oil cylinder 1, and the upper surface of the support plate 5 is used to support the load. Taking the AGV flatbed as an example, a suspension system consisting of four sets of oil cylinders 1 and support plates 5 can be set up to jointly support the four corners of the AGV's load platform.

[0034] The accumulator group 2 includes at least two accumulators, each at different pressure levels. In this embodiment, the accumulator group 2 includes a high-pressure accumulator 21, a medium-pressure accumulator 22, and a low-pressure accumulator 23. The pressure level corresponding to the high-pressure accumulator 21 is higher than the pressure level corresponding to the medium-pressure accumulator 22, and the pressure level corresponding to the medium-pressure accumulator 22 is higher than the pressure level corresponding to the low-pressure accumulator 23. At least one of each of the high-pressure accumulator 21, the medium-pressure accumulator 22, and the low-pressure accumulator 23 is provided.

[0035] As a preferred technical solution of this embodiment, the high-pressure accumulator 21 is connected to the rodless chamber of the cylinder 1 via an oil passage. A first solenoid valve 41 is provided on the oil passage connecting the high-pressure accumulator 21 and the rodless chamber of the cylinder 1. The first solenoid valve 41 controls the connection and disconnection between the high-pressure accumulator 21 and the cylinder 1. In this embodiment, the first solenoid valve 41 can be a two-position, two-way valve. When the first solenoid valve 41 is de-energized, the first solenoid valve 41 is in a connected state, connecting the high-pressure accumulator 21 to the rodless chamber of the cylinder 1; when the first solenoid valve 41 is energized, the first solenoid valve 41 is in a disconnected state, disconnecting the high-pressure accumulator 21 from the rodless chamber of the cylinder 1. Alternatively, the first solenoid valve 41 can be configured to be in a connected state when energized and disconnected when de-energized. This requires that the first solenoid valve 41 be in a connected and disconnected state when energized and de-energized, respectively.

[0036] As a preferred technical solution of this embodiment, the medium-pressure accumulator 22 is connected to the rodless chamber of the cylinder 1 via an oil passage. A second solenoid valve 42 is provided on the oil passage connecting the medium-pressure accumulator 22 and the rodless chamber of the cylinder 1. The second solenoid valve 42 controls the connection and disconnection between the medium-pressure accumulator 22 and the cylinder 1. In this embodiment, the second solenoid valve 42 can be a two-position, two-way valve. When the second solenoid valve 42 is de-energized, the second solenoid valve 42 is in a connected state, connecting the medium-pressure accumulator 22 to the rodless chamber of the cylinder 1; when the second solenoid valve 42 is energized, the second solenoid valve 42 is in a disconnected state, disconnecting the medium-pressure accumulator 22 from the rodless chamber of the cylinder 1. Alternatively, the second solenoid valve 42 can be configured to be in a connected state when energized and disconnected when de-energized. This requires that the second solenoid valve 42 be in a connected and disconnected state when energized and de-energized, respectively.

[0037] As a preferred technical solution of this embodiment, the low-pressure accumulator 23 is connected to the rodless chamber of the oil cylinder 1. This connection is achieved through a first oil passage 61, which is equipped with a one-way valve 7. This allows one-way flow of oil from the low-pressure accumulator 23 to the rodless chamber via the first oil passage 61, facilitating oil replenishment of the rodless chamber. Furthermore, the low-pressure accumulator 23 is connected to the rodless chamber via a second oil passage 62, which is equipped with a relief valve 8. When the oil pressure in the rodless chamber is too high, exceeding the threshold of the relief valve 8, the oil in the rodless chamber can be discharged through the relief valve 8 on the second oil passage 62 to the low-pressure accumulator 23.

[0038] As a preferred technical solution of this embodiment, the high-pressure accumulator 21, the medium-pressure accumulator 22, and the low-pressure accumulator 23 can all be bladder-type accumulators. The interior of the accumulator is divided into an upper chamber and a lower chamber by a bladder. The upper chamber is filled with gas at a corresponding pressure, while the lower chamber is filled with hydraulic oil. The upper chamber of the high-pressure accumulator 21 is filled with high-pressure gas, the upper chamber of the medium-pressure accumulator 22 is filled with medium-pressure gas, and the upper chamber of the low-pressure accumulator 23 is filled with low-pressure gas.

[0039] Travel switch 3 monitors the stroke of cylinder 1, controlling its connection to the corresponding accumulator pressure level. Positioned near cylinder 1 and below support plate 5, travel switch 3 retracts downward to varying degrees as a load is placed on support plate 5. Support plate 5 triggers travel switch 3, which then generates signals at different positions to control the powering on and off of first and second solenoid valves 41 and 42.

[0040] As the preferred technical solution of this embodiment, the position points include a medium pressure position point and a high pressure position point. The medium pressure position point is higher than the high pressure position point. When the travel switch 3 has not reached the medium pressure position point, the travel switch 3 does not send a signal; when the travel switch 3 reaches the medium pressure position point, a medium pressure position signal is sent; when the travel switch 3 reaches the high pressure position point, a medium pressure position signal and a high pressure position signal are sent at the same time.

[0041] As the preferred technical solution of this embodiment, when the limit switch 3 does not send a signal, the first solenoid valve 41 and the second solenoid valve 42 lose power, and the high-pressure accumulator 21 and the medium-pressure accumulator 22 are both connected to the rodless chamber of the oil cylinder 1. When the road surface is uneven, the load fluctuation corresponds to the pressure level range of the medium-pressure accumulator 22. The medium-pressure accumulator 22 can absorb / release oil, and the corresponding piston rod 11 of the oil cylinder 1 retracts / extends to absorb the vibration caused by the uneven road surface. Because the load at this time does not reach the charging pressure of the high-pressure accumulator 21, the gas pressure in the high-pressure accumulator 21 is greater than the oil pressure in the oil cylinder 1, and no oil enters the high-pressure accumulator 21, so the high-pressure accumulator 21 does not participate in the shock absorption work.

[0042] When limit switch 3 signals a medium-pressure position, second solenoid valve 42 is immediately energized, while first solenoid valve 41 remains de-energized. High-pressure accumulator 21 communicates with the rodless chamber, while medium-pressure accumulator 22 disconnects from the rodless chamber. When the road surface is uneven, load fluctuations corresponding to the pressure level range of high-pressure accumulator 21 cause the high-pressure accumulator 21 to absorb or release oil, causing piston rod 11 of cylinder 1 to retract or extend, thereby absorbing the vibrations caused by the uneven road surface.

[0043] When travel switch 3 simultaneously signals both the medium-pressure position and the high-pressure position, first solenoid valve 41 is immediately energized, while second solenoid valve 42 remains energized. Both high-pressure accumulator 21 and medium-pressure accumulator 22 are disconnected from the rodless chamber. When the road surface is uneven and the load exceeds the pressure rating of high-pressure accumulator 21, this constitutes an overload condition. To protect the accumulator and cylinder 1, both medium-pressure accumulator 22 and high-pressure accumulator 21 are disconnected, and cylinder 1 is supported by the back pressure of relief valve 8. When the load does not exceed the set value of relief valve 8, cylinder 1 is locked and loses its shock absorption function. When the load exceeds the set value of relief valve 8, the excess pressure shock is absorbed.

[0044] A pump 9 is also provided to supply oil to the oil cylinder 1 and the accumulator group 2 and adjust the initial position of the piston rod 11 of the oil cylinder 1 .

[0045] As a preferred technical solution of this embodiment, the pump 9 can be a manual pump. Before the system is used, the pump 9 is used to add oil and pressurize the oil cylinder 1 and the energy storage group 2. The pump 9 is removed and the system can be put into use.

[0046] In actual use, a support frame can be set up, and wheels are set at the bottom end of the support frame. The oil cylinder 1, accumulator group 2, travel switch 3, two solenoid valves 41, 42, one-way valve 7 and overflow valve 8 are all placed on the support frame. The components are connected by pipes for easy mobile use.

[0047] Based on the above technical solution, the working principle of the shock absorption system of this embodiment is as follows:

[0048] For example, if a single AGV leg needs to meet shock absorption requirements for loads between 1 and 7 tons, the high-pressure accumulator 21 is inflated to 30 bar before use to withstand load fluctuations between 2.5 and 7 tons. The medium-pressure accumulator 22 is inflated to 10 bar to withstand load fluctuations between 1 and 2.5 tons. The low-pressure accumulator 23 is inflated to 3 bar for oil replenishment and system protection. The relief valve 8 is set to a protection pressure of 100 bar.

[0049] (1) When the system is under a small load and the limit switch 3 does not send a signal, only the medium-pressure accumulator 22 is put into operation:

[0050] The piston rod 11 of the oil cylinder 1 retracts, but the travel switch 3 has not reached the medium pressure position point, and no signal is emitted: at this time, the first solenoid valve 41 and the second solenoid valve 42 lose power, and the high-pressure accumulator 21 and the medium-pressure accumulator 22 are both connected to the rodless chamber of the oil cylinder 1. Using the above case as an explanation, when the road surface is uneven and the load fluctuates within the range of 1 to 2.5 tons, the medium-pressure accumulator 22 absorbs / releases oil, and the piston rod 11 of the oil cylinder 1 retracts / extends accordingly to absorb the vibration caused by the uneven road surface; because the load at this time does not reach the charging pressure of the high-pressure accumulator 21, the gas pressure in the high-pressure accumulator 21 is greater than the oil pressure in the oil cylinder 1, and no oil enters the high-pressure accumulator 21, so the high-pressure accumulator 21 does not participate in the shock absorption work.

[0051] When the load is removed, the piston rod 11 of the oil cylinder 1 returns to its original position.

[0052] (2) When the suspension system is under heavy load and the travel switch 3 sends a medium pressure position signal, only the high-pressure accumulator 21 is put into operation:

[0053] Cylinder 1's piston rod 11 retracts, and travel switch 3 reaches the medium-pressure position, generating a medium-pressure position signal. At this point, the second solenoid valve 42 is immediately energized, disconnecting the medium-pressure accumulator 22 from cylinder 1. The first solenoid valve 41 remains de-energized, connecting the high-pressure accumulator 21 to cylinder 1. Using the above example as an example, when the road surface is uneven and the load fluctuates between 2.5 and 7 tons, the high-pressure accumulator 21 absorbs / releases oil, corresponding to the retraction / extension of cylinder 1's piston rod 11, thereby absorbing the vibrations caused by the uneven road surface. Because the second solenoid valve 42 is closed at this time, no oil enters the medium-pressure accumulator 22, and the medium-pressure accumulator 22 does not participate in the shock absorption process.

[0054] When the load is removed, the piston rod 11 of the oil cylinder 1 returns to its original position. During this process, the travel switch 3 returns to the medium pressure position point and stops sending the medium pressure position signal. At this time, the second solenoid valve 42 loses power, and the medium pressure accumulator 22 is connected to the oil cylinder 1. The system returns to its initial state.

[0055] (3) When the suspension system is overloaded and the travel switch 3 sends out the medium pressure position signal and the high pressure position signal:

[0056] Cylinder 1's piston rod 11 retracts, and travel switch 3 reaches the high-pressure position, simultaneously emitting both a medium-pressure position signal and a high-pressure position signal. At this point, first solenoid valve 41 is immediately energized, while second solenoid valve 42 remains energized, disconnecting both accumulators from cylinder 1. Using the aforementioned example as an example, when the road surface is uneven and the load exceeds 7 tons, this constitutes an overload condition. To protect the accumulators and cylinder 1, both high-pressure accumulator 21 and medium-pressure accumulator 22 are disconnected, leaving cylinder 1 supported by the back pressure of relief valve 8. When the load does not exceed the set value of relief valve 8, cylinder 1 is locked and loses its shock absorption function. When the load exceeds the set value of relief valve 8, the excess pressure shock is absorbed.

[0057] When the load is removed, the piston rod 11 of the oil cylinder 1 returns to its original position. During this process, the travel switch 3 returns to above the high-pressure position point and stops issuing the high-pressure position signal. At this time, the first solenoid valve 41 loses power, and the high-pressure accumulator 21 is connected to the oil cylinder 1. After the travel switch 3 returns to above the medium-pressure position point, it stops issuing the medium-pressure position signal. At this time, the second solenoid valve 42 also loses power, and the medium-pressure accumulator 22 is also connected to the oil cylinder 1. The system eventually returns to its initial state.

[0058] In the event of an overload, the system only provides protection, not shock absorption. To increase the system's shock absorption load range, for example, increasing the load compensation range from 1-7 tons to 1-10 tons, you can increase the number of accumulators with higher pressures, such as increasing from the original three accumulators with different pressures to four or more.

[0059] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. A shock absorption system, characterized in that: include: Oil cylinder (1); An accumulator group (2), the accumulator group (2) comprising at least two accumulators, the at least two accumulators being at different pressure levels; A travel switch (3) monitors the travel of the oil cylinder (1) and controls the oil cylinder (1) to communicate with an accumulator of a corresponding pressure level.

2. A shock absorption system according to claim 1, characterized in that: The accumulator group (2) comprises a high-pressure accumulator (21) and a medium-pressure accumulator (22), and both the high-pressure accumulator (21) and the medium-pressure accumulator (22) are in communication with the rodless chamber of the oil cylinder (1).

3. A shock absorption system according to claim 2, characterized in that: The device further comprises a first solenoid valve (41) and a second solenoid valve (42), wherein the first solenoid valve (41) controls the on-off between the high-pressure accumulator (21) and the oil cylinder (1), and the second solenoid valve (42) controls the on-off between the medium-pressure accumulator (22) and the oil cylinder (1), and the travel switch (3) controls the states of the first solenoid valve (41) and the second solenoid valve (42).

4. A shock absorption system according to claim 3, characterized in that: The piston rod of the oil cylinder (1) triggers the travel switch (3), and the travel switch (3) sends signals when reaching different positions to control the power on and off of the first solenoid valve (41) and the second solenoid valve (42).

5. A shock absorption system according to claim 4, characterized in that: The position points include a medium-pressure position point and a high-pressure position point, wherein the medium-pressure position point is higher than the high-pressure position point. When the travel switch (3) reaches the medium-pressure position point, a medium-pressure position signal is sent to control the second solenoid valve (42) to be in an off state; when the travel switch (3) reaches the high-pressure position point, a medium-pressure position signal and a high-pressure position signal are sent to control the first solenoid valve (41) to be in an off state.

6. A shock absorption system according to any one of claims 4-5, characterized in that: A support plate (5) is provided on the piston rod (11) of the oil cylinder (1), and the piston rod (11) triggers the travel switch (3) through the support plate (5).

7. A shock absorption system according to claim 2, characterized in that: The accumulator group (2) further includes a low-pressure accumulator (23), and the low-pressure accumulator (23) is in communication with the oil cylinder (1).

8. A shock absorption system according to claim 7, characterized in that: The low-pressure accumulator (23) is connected to the rodless chamber of the oil cylinder (1) through a first oil passage (61). A one-way valve (7) is provided on the first oil passage (61). The low-pressure accumulator (23) replenishes oil to the rodless chamber of the oil cylinder (1) through the one-way valve (7).

9. A shock absorption system according to any one of claims 7-8, characterized in that: The low-pressure accumulator (23) is in communication with the rodless chamber of the oil cylinder (1) via a second oil passage (62), and a relief valve (8) is provided on the second oil passage (62).

10. The shock absorption system according to claim 7, characterized in that: It also includes a pump (9), which supplies oil to the oil cylinder (1) and the accumulator group (2) to adjust the initial position of the piston rod (11) of the oil cylinder (1).

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