Stable module

Abstract

The utility model relates to the technical field of hydraulic pressure, in particular to a stabilizing module. A stabilization module comprising: an energy accumulator; the prefill valve controls connection and disconnection between the energy accumulator and the rodless cavity, the prefill valve switches working positions under the oil pressure action of the energy accumulator and the rodless cavity, when the oil pressure in the rodless cavity is higher than the oil pressure in the energy accumulator, the prefill valve is located at a first working position, and when the oil pressure in the rodless cavity is lower than the oil pressure in the energy accumulator, the prefill valve is located at a second working position; oil in the rodless cavity can flow to the energy accumulator through the prefill valve; when the oil pressure in the energy accumulator is higher than the oil pressure in the rodless cavity, the prefill valve is located at a second working position, and the oil liquid in the energy accumulator can flow to the oil tank T through the prefill valve; and when the oil pressure in the rodless cavity is basically the same as the oil pressure of the energy accumulator, the prefill valve is located at the middle position, and the energy accumulator is not communicated with the rodless cavity. The technical problem that in the prior art, a stabilizing module cannot automatically balance the pressure of a rodless cavity oil way and the pressure of an energy accumulator in the low-speed state is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulics, and particularly relates to a stability module. Background Art

[0002] A loader is a construction machinery with functions of shoveling, loading, and transporting. During the long-distance transportation of the loader bucket full of materials, the rod chamber and the rodless chamber of the boom cylinder are in a closed state, and the internal hydraulic oil pressure will generate impact changes with the bumps of the road surface, resulting in severe vibration of the whole machine and material scattering, greatly reducing the driving comfort and safety. For this reason, the driver needs to reduce the vehicle speed when transporting materials, resulting in reduced work efficiency and unable to ensure reduced material scattering.

[0003] For example, the document with the application number CN202311250085.4 discloses a loader stability module and its hydraulic system, including: a main spool valve, an accumulator, a filling valve, an electromagnetic reversing valve, and a pressure balance spool valve; among them, the main spool valve is a two-position four-way spool valve. The main spool valve is connected to the rodless chamber oil circuit through the first main valve port, the main spool valve is connected to the rod chamber through the second main valve port, the main spool valve is connected to the accumulator through the third main valve port, and the fourth main valve port is connected to the return oil T; a first spring is provided at the right end of the main spool valve, and the main spool valve also has a left working position and a right working position; the switching between the left and right working positions of the main spool valve is controlled by the electromagnetic reversing valve and the first spring; when the electromagnetic reversing valve is not powered on, the first oil port of the reversing valve is communicated with the third oil port of the reversing valve, and the hydraulic oil passing through the first oil port and the third oil port of the reversing valve acts on the left end of the main spool valve, so that the pressure at the left end of the main spool valve is greater than the elastic force of the first spring, and the main spool valve is reversed to the left working position; the rodless chamber oil circuit and the accumulator are in a cut-off state, and the rod chamber oil circuit and the return oil T are in a cut-off state, that is, the first main valve port and the third main valve port, and the second main valve port and the fourth main valve port of the main valve are all in a cut-off state, so that the stability module is in a rigid state; when the electromagnetic reversing valve is powered on and the third oil port of the reversing valve is communicated with the fuel tank through the second oil port of the reversing valve, the pressure at the left end decreases, and the elastic force of the first spring acts on the main spool valve to reverse it to the right working position; the rodless chamber oil circuit and the accumulator are in a communicating state, and the rod chamber oil circuit and the return oil T are in a communicating state, that is, the first main valve port and the third main valve port, and the second main valve port and the fourth main valve port of the main valve are all in a communicating state, so that the stability module is in a flexible state. The left end of the pressure balance spool valve is respectively connected to the first main valve port and the rodless chamber oil circuit, the right end and the oil inlet of the pressure balance spool valve are respectively connected to the accumulator, and the oil outlet of the pressure balance spool valve is connected to the return oil T, so as to adjust the working position of the pressure balance spool valve in real time according to the change of the rodless chamber pressure and control the pressure release direction of the accumulator, so as to balance the pressure of the rodless chamber oil circuit and the accumulator.

[0004] The stability module in the above-mentioned document can control the connection between the rodless chamber oil circuit and the accumulator through an electromagnetic reversing valve to balance the pressures of the rodless chamber oil circuit and the accumulator. However, when the loading locomotive speed is low, it cannot play the role of automatically controlling the on-off between the rodless chamber and the accumulator, and thus cannot automatically balance the pressures of the rodless chamber oil circuit and the accumulator. Summary of the Invention

[0005] In order to solve the technical problem that the stability module in the prior art cannot achieve automatic pressure balance between the rodless chamber oil circuit and the accumulator in the low-speed state, the present invention provides a stability module to solve the above technical problem.

[0006] In order to solve the above technical problem, the present invention provides a stability module, including:

[0007] An accumulator;

[0008] A filling valve, the filling valve controls the on-off between the accumulator and the rodless chamber, and the filling valve switches the working position under the action of the oil pressures of the accumulator and the rodless chamber. When the oil pressure in the rodless chamber is higher than the oil pressure in the accumulator, the filling valve is in the first working position, and the oil in the rodless chamber can flow through the filling valve to the accumulator; when the oil pressure in the accumulator is higher than the oil pressure in the rodless chamber, the filling valve is in the second working position, and the oil in the accumulator can flow through the filling valve to the oil tank T; when the oil pressures in the rodless chamber and the accumulator are basically the same, the filling valve is in the middle position, and the accumulator and the rodless chamber are not connected.

[0009] According to an embodiment of the present invention, it further includes a first holding valve and a first pilot valve. The first holding valve controls the on-off between the accumulator and the rodless chamber, and the first pilot valve controls the pilot oil to enter and exit the first spring chamber of the first holding valve to enable the first holding valve to switch the working state.

[0010] According to an embodiment of the present invention, the pilot oil of the first spring chamber is taken from the higher oil pressure of the accumulator and the rodless chamber.

[0011] According to an embodiment of the present invention, it further includes a second holding valve and a second pilot valve. The second holding valve controls the on-off between the rod chamber and the oil tank T, and the second pilot valve controls the pilot oil to enter and exit the second spring chamber of the second holding valve to enable the second holding valve to switch the working state.

[0012] According to an embodiment of the present invention, the pilot oil of the second spring chamber is taken from the rod chamber.

[0013] According to an embodiment of the present invention, the first pilot valve and / or the second pilot valve switch the working state under the action of a control valve.

[0014] According to an embodiment of the present utility model, the control valve controls the pilot oil to enter and exit the first pilot chamber of the first pilot valve; and / or, the control valve controls the pilot oil to enter and exit the second pilot chamber of the second pilot valve.

[0015] According to an embodiment of the present utility model, the pilot oil in the first pilot chamber and / or the second pilot chamber is taken from the higher oil pressure in the rodless chamber and the accumulator.

[0016] According to an embodiment of the present utility model, it further includes a safety valve group. The accumulator is communicated with the oil tank T through the safety valve group. The safety valve group includes a safety valve and a check valve. When the oil pressure of the accumulator is higher than the set pressure, the accumulator discharges oil through the safety valve; when the oil pressure of the accumulator is lower than the oil pressure of the oil tank T, the oil tank T can replenish oil to the accumulator through the check valve.

[0017] According to an embodiment of the present utility model, it further includes a manual oil discharge assembly. The accumulator is also communicated with the oil tank T through an oil discharge oil path. The manual oil discharge assembly controls the on-off of the oil discharge oil path.

[0018] Based on the above technical solutions, the technical effects that the present utility model can achieve are as follows:

[0019] 1. For the stability module of the present utility model, by setting a filling valve to control the on-off between the accumulator and the rodless chamber, the pilot chambers at both ends of the filling valve are respectively communicated with the accumulator and the rodless chamber, and the spool of the filling valve can slide under the pressure difference between the accumulator and the rodless chamber, thereby adjusting the communication between the accumulator and the rodless chamber or the communication between the accumulator and the oil tank T. When the stability module is applied to a loader, it can achieve a small-area flow between the rodless chamber of the boom and the accumulator at a low vehicle speed, ensure that the pressure difference between the rodless chamber and the accumulator is always within a suitable range, and thereby achieve automatic balance of the pressure of the rodless chamber oil path and the accumulator in the low-speed state;

[0020] 2. The stability module of the present utility model is further provided with a first holding valve and a first pilot valve. The accumulator is also connected to the rodless chamber through the first holding valve. The first holding valve has a first spring chamber. The first pilot valve controls the inlet and outlet of pilot oil in the first spring chamber. Since the pilot oil in the first spring chamber is taken from the higher oil pressure of the accumulator and the rodless chamber, when the first pilot valve controls the pilot oil to enter the first spring chamber, the spool of the first holding valve can be in a closed state under the action of the pilot oil, and the connection between the rodless chamber and the accumulator is disconnected. When the first pilot valve controls the first spring chamber to drain oil, the spool of the first holding valve opens under the action of the oil pressure of the accumulator and the rodless chamber, and the rodless chamber is connected to the accumulator; a second holding valve and a second pilot valve are also provided. The rod chamber is connected to the oil tank T through the second holding valve. The second holding valve has a second spring chamber. The second pilot valve controls the inlet and outlet of pilot oil in the second spring chamber. The pilot oil in the second spring chamber is taken from the rod chamber. When the second pilot valve controls the pilot oil to enter the second spring chamber, when the pressure in the rod chamber is higher than the pressure in the oil tank T, the acting force generated by the pressure in the second spring chamber is larger, and the spool of the second holding valve cannot be opened, and the connection from the rod chamber to the oil tank T cannot be established. When the pressure in the oil tank T is higher than the pressure in the rod chamber, the acting force generated by the pressure in the second spring chamber is smaller, and the spool of the second holding valve opens, and the rod chamber is connected to the oil tank T, and the oil tank T can supply oil to the rod chamber; when the second pilot valve controls the second spring chamber to communicate with the drain port, the acting force generated by the pressure in the second spring chamber is smaller, and the spool of the second holding valve opens, and the rod chamber and the accumulator can be connected bidirectionally. That is, when the loading vehicle speed is relatively high, large-area flow can be realized between the rodless chamber of the boom and the accumulator, and between the rod chamber of the boom and the oil tank T through the first holding valve and the second holding valve, thereby realizing pressure balance under high-speed conditions;

[0021] 3. The stability module of the present utility model controls the first pilot valve and the second pilot valve simultaneously by setting a control valve. The control valve can be set as an electromagnetic valve. The electromagnetic valve is energized or de-energized to control the commutation of the first pilot valve and the second pilot valve, so that when the loader is running at a low speed, the electromagnetic valve is de-energized, and small-area flow is realized between the rodless chamber and the accumulator through the filling valve; when the loader is running at a high speed, the electromagnetic valve is energized, the rodless chamber is connected to the accumulator through the first holding valve, and the rod chamber is connected to the oil tank T through the second holding valve, realizing two large-area flows. That is, by energizing and de-energizing the electromagnetic valve, the switching between two working modes of low vehicle speed and small-area flow, and high vehicle speed and large-area flow can be realized;

[0022] 4. The stability module of the present utility model further includes a safety valve group. When the pressure of the accumulator exceeds the set pressure, the overflow function of the safety valve is activated, and the oil fluid of the accumulator is drained to the oil tank T; when the pressure of the accumulator is too low, the oil replenishment function of the safety valve is activated, and the oil tank T replenishes oil to the accumulator, thereby ensuring the pressure of the accumulator;

[0023] 5. The stability module of the present utility model further includes a manual oil drain assembly. When a failure occurs, the manual oil drain assembly can be manually operated, and the oil in the accumulator can flow through the oil drain passage to the fuel tank T to achieve manual oil drainage. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is the hydraulic schematic diagram of the stability module of the present utility model;

[0025] Figure 2 is the structural schematic diagram of the filling valve;

[0026] Figure 3 is the structural schematic diagram of the first holding valve;

[0027] Figure 4 is the structural schematic diagram of the first pilot valve;

[0028] Figure 5 is the structural schematic diagram of the second holding valve;

[0029] Figure 6 is the structural schematic diagram of the second pilot valve;

[0030] Figure 7 is the structural schematic diagram of the control valve;

[0031] Figure 8 is the structural schematic diagram of the first shuttle valve;

[0032] Figure 9 is the structural schematic diagram of the second shuttle valve;

[0033] Figure 10 is the structural schematic diagram of the manual oil drain assembly;

[0034] In the figure: 1 - accumulator; 2 - filling valve; 21 - filling valve sleeve; 211 - first oil hole; 212 - second oil hole; 213 - third oil hole; 214 - oil outlet hole; 22 - filling valve spool; 23 - first elastic member; 3 - first holding valve; 31 - first conical spool; 32 - first oil port; 33 - second oil port; 34 - first spring; 35 - first plug; 36 - first spring chamber; 4 - first pilot valve; 41 - first valve sleeve; 411 - fourth oil hole; 412 - fifth oil hole; 42 - first spool; 43 - second plug; 44 - second elastic member; 45 - first elastic chamber; 46 - first pilot chamber; 5 - second holding valve; 51 - second conical spool; 52 - third oil port; 53 - fourth oil port; 54 - second spring; 55 - third plug; 56 - second spring chamber; 6 - second pilot valve; 61 - second valve sleeve; 611 - sixth oil hole; 612 - seventh oil hole; 62 - second spool; 63 - fourth plug; 64 - third elastic member; 65 - second elastic chamber; 66 - second pilot chamber; 7 - control valve; 71 - control valve sleeve; 72 - control valve spool; 73 - electromagnetic assembly; 74 - fifth oil port; 75 - sixth oil port; 76 - oil return port; 81 - first shuttle valve; 811 - first shuttle valve spool; 812 - first steel ball; 813 - first oil inlet; 814 - second oil inlet; 815 - first oil outlet; 82 - second shuttle valve; 821 - second shuttle valve spool; 822 - second steel ball; 823 - third oil inlet; 824 - fourth oil inlet; 825 - second oil outlet; 9 - safety valve group; 91 - safety valve; 92 - check valve; 10 - manual oil drain assembly; 101 - oil drain screw; 102 - nut; 20 - oil drain passage; 100 - module body; 200 - actuator. Detailed implementation manners

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way restrictive of the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0036] It should be noted that the terms used herein are only for describing specific implementation manners 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.

[0037] Unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and values set forth in these embodiments do not limit the scope of the present utility model. At the same time, it should be understood that, for the convenience of description, the sizes of the various parts shown in the drawings are not drawn in actual proportional relationship. Technologies, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods and devices should be regarded as part of the description. In all the examples shown and discussed here, any specific values should be construed as merely exemplary, and not as limiting. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, further discussion thereof is not required in subsequent drawings.

[0038] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom", etc. are generally based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Without contrary statements, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus cannot be construed as limiting the protection scope of the present utility model; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0039] For the convenience of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "above" and the like can be used here to describe the spatial positional relationship of one device or feature to other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to cover different orientations in use or operation in addition to the orientation depicted in the drawings. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations should be made for the spatial relative descriptions used here.

[0040] In addition, it should be noted that the use of words such as "first", "second" to limit components is only for the convenience of distinguishing the corresponding components. Without additional statements, the above words have no special meanings, and thus cannot be construed as limiting the protection scope of the present utility model.

[0041] As Figures 1-10 shown, this embodiment provides a stabilizing module, which is used to buffer and shock-absorb the actuator 200, and can be specifically used for a loader. During the transportation of the loader, it can buffer and shock-absorb the boom cylinder that plays an actuating role. The stabilizing module includes an accumulator 1, a filling valve 2, a first holding valve 3 and a second holding valve 5. The accumulator 1 is connected to the rodless chamber of the actuator 200 through the filling valve 2. The filling valve 2 can switch its working position under the pressure difference between the accumulator 1 and the rodless chamber, and thus can achieve a small-area flow between the accumulator 1 and the rodless chamber automatically at low speed. In addition, the accumulator 1 is also connected to the rodless chamber of the actuator 200 through the first holding valve 3. The rod chamber of the actuator 200 is connected to the oil tank T through the second holding valve 5. The first holding valve 3 and the second holding valve 5 can be controlled to switch their working positions. When the loader is running at high speed, the first holding valve 3 and the second holding valve 5 can be controlled to be in the on state, so as to achieve a large-area flow between the accumulator 1 and the rodless chamber and between the rod chamber and the oil tank T at high speed. In this way, the switching between large-area flow at high speed and small-area flow at low speed can be realized.

[0042] The accumulator 1 is connected to the rodless chamber of the actuator 200 through the filling valve 2, and the filling valve 2 switches its working position under the oil pressure of the accumulator 1 and the rodless chamber. When the oil pressure in the rodless chamber is higher than the oil pressure in the accumulator 1, the filling valve 2 is in the first working position, and the oil in the rodless chamber can flow through the filling valve 2 to the accumulator 1; when the oil pressure in the accumulator 1 is higher than the oil pressure in the rodless chamber, the filling valve 2 is in the second working position, and the oil in the accumulator 1 can flow through the filling valve 2 to the oil tank T; when the oil pressure in the rodless chamber is basically the same as the oil pressure in the accumulator 1, the filling valve 2 is in the middle position, and the accumulator 1 and the rodless chamber are not connected.

[0043] Specifically, the filling valve 2 is set as a three-position three-way valve. The filling valve 2 includes a filling valve sleeve 21 and a filling valve spool 22. The filling valve sleeve 21 is assembled in the module body 100, and the filling valve spool 22 is slidably assembled in the filling valve sleeve 21. A number of oil holes are provided on the filling valve sleeve 21, and the filling valve spool 22 slidably controls the on-off between the oil holes. The filling valve sleeve 21 is provided with a first oil hole 211, a second oil hole 212 and a third oil hole 213. Among them, the first oil hole 211 is connected to the accumulator 1 through the oil passage in the module body 100; the second oil hole 212 is connected to the rodless chamber of the actuator 200 through the oil passage in the module body 100; the third oil hole 213 is connected to the oil tank T through the oil passage in the module body 100. The first oil hole 211 is located axially between the second oil hole 212 and the third oil hole 213, and the filling valve spool 22 can slide to control the connection between the first oil hole 211 and the second oil hole 212, or the connection between the first oil hole 211 and the third oil hole 213.

[0044] As a preferred technical solution of this embodiment, two first elastic members 23 are assembled with limited positions at one end of the liquid filling valve spool 22. The liquid filling valve sleeve 21 is fixedly assembled, and a limiting protrusion is formed on the inner surface of the liquid filling valve sleeve 21. The two first elastic members 23 are respectively located on both sides of the limiting protrusion. In the initial state, the liquid filling valve spool 22 maintains a balanced state under the action of the two first elastic members 23 and is in the middle position. When the liquid filling valve spool 22 is in the middle position, the first oil hole 211, the second oil hole 212, and the third oil hole 213 are all not communicated.

[0045] As a preferred technical solution of this embodiment, an internal flow channel is further provided on the liquid filling valve spool 22. One end of the internal flow channel axially extends to the end face, and the other end of the internal flow channel radially extends to the outer peripheral surface. The oil in the accumulator 1 can flow through the first oil port 211 on the liquid filling valve sleeve 21 and the internal flow channel to the end of the liquid filling valve spool 22 and act on the first end of the liquid filling valve spool 22; the oil in the rodless cavity can flow through the oil outlet hole 214 on the liquid filling valve sleeve 21 to the cavity where the two first elastic members 23 are located and act on the second end of the liquid filling valve spool 22. In this way, the liquid filling valve spool 22 can automatically slide under the action of the oil pressures of the accumulator 1 and the rodless cavity. By providing the liquid filling valve 2, the oil pressure in the rodless cavity can be kept substantially the same as the oil pressure in the accumulator 1.

[0046] The accumulator 1 is further communicated with the rodless cavity of the actuator 200 through the first holding valve 3. Specifically, the first holding valve 3 includes a first conical valve core 31. The first conical valve core 31 is slidably assembled in the module body 100. One end where the conical surface of the first conical valve core 31 is located extends into the module body 100. A first plug 35 is provided at the other end of the first conical valve core 31 to block the mounting port. A first spring cavity 36 is formed between the first conical valve core 31 and the first plug 35. A first spring 34 is provided in the first spring cavity 36. Both ends of the first spring 34 act on the first conical valve core 31 and the first plug 35 respectively. A first oil port 32 and a second oil port 33 are provided on the module body 100 around the first conical valve core 31. The first oil port 32 is communicated with the accumulator 1 through an oil passage in the module body 100. The oil pressure in the accumulator 1 can act on the conical surface of the first conical valve core 31 after flowing in through the first oil port 32. The second oil port 33 is communicated with the rodless cavity of the actuator 200 through an oil passage in the module body 100. The oil pressure in the rodless cavity can act on the circumferential surface of the first conical valve core 31 through the second oil port 33. When the conical surface of the first conical valve core 31 is sealed and abutted against the cavity wall, the accumulator 1 and the rodless cavity are not communicated; when the first conical valve core 31 is pushed and slid open, the accumulator 1 and the rodless cavity are communicated.

[0047] As a preferred technical solution of this embodiment, pilot oil can be introduced into the first spring chamber 36, and the pilot oil is taken from the higher oil pressure between the accumulator 1 and the rodless chamber. When the pilot oil enters the first spring chamber 36, the acting force in the first spring chamber 36 is large, and the first conical valve core 31 cannot slide open, so the accumulator 1 and the rodless chamber cannot communicate. When the first spring chamber 36 communicates with the oil tank T, the acting force in the first spring chamber 36 is small, and the first conical valve core 31 can slide open under the oil pressure of the accumulator 1 and the rodless chamber, and the accumulator 1 and the rodless chamber communicate.

[0048] As a preferred technical solution of this embodiment, the higher oil pressure between the accumulator 1 and the rodless chamber can be obtained through the first shuttle valve 81. The first shuttle valve 81 includes a first shuttle valve core 811 and a first steel ball 812. The first shuttle valve core 811 is fixedly assembled, and the first steel ball 812 is located at one axial end of the first shuttle valve core 811. An internal oil passage is provided in the first shuttle valve core 811. One end of the internal oil passage of the first shuttle valve core 811 axially extends to be close to the end face of the first steel ball 812, and the other end of the internal oil passage of the first shuttle valve core 811 radially extends to the outer peripheral surface. A first oil inlet 813, a second oil inlet 814 and a first oil outlet 815 are arranged around the first shuttle valve 81 in the module body 100. The first oil inlet 813 communicates with the rodless chamber of the module body 100, the second oil inlet 814 communicates with the accumulator 1, and the first oil outlet 815 provides pilot oil for the first spring chamber 36.

[0049] The first pilot valve 4 controls the inflow and outflow of the pilot oil in the first spring chamber 36 of the first holding valve 3. The first pilot valve 4 can be set as a two-position three-way valve. When the first pilot valve 4 is in the first working position, the pilot oil enters the first spring chamber 36, and the first spring chamber 36 is in a high-pressure state; when the first pilot valve 4 is in the second working position, the first spring chamber 36 communicates with the oil tank T, and the first spring chamber 36 is in a low-pressure state.

[0050] Specifically, the first pilot valve 4 includes a first valve sleeve 41 and a first valve core 42. The first valve sleeve 41 is assembled in the valve body of the first pilot valve 4. The second plug 43 seals the installation port of the valve body of the first pilot valve 4 to form a sealed installation space. The valve body of the first pilot valve 4 is installed on the module body 100 by screws. The second plug 43 abuts against the first valve sleeve 41. One end of the first valve core 42 is slidably assembled in the first valve sleeve 41, and the other end of the first valve core 42 extends out of the first valve sleeve 41 and is sleeved with a second elastic member 44. Both ends of the second elastic member 44 act on the second plug 43 and the first valve core 42 respectively. A fourth oil hole 411 and a fifth oil hole 412 are formed on the first valve sleeve 41. The fourth oil hole 411 communicates with the pilot oil source through an oil passage, that is, the fourth oil hole 411 communicates with the first oil outlet 815 of the first shuttle valve 81, and the fifth oil hole 412 communicates with the first spring chamber 36 through an oil passage.

[0051] As a preferred technical solution of this embodiment, the cavity where the second elastic member 44 is located is the first elastic cavity 45, and the first elastic cavity 45 communicates with the fuel tank T; a first pilot cavity 46 is formed at one end of the first spool 42 away from the second elastic member 44, and pilot oil can be introduced into the first pilot cavity 46. The first spool 42 slides under the action of the second elastic member 44 and the pilot oil in the first pilot cavity 46 to control the communication between the fourth oil hole 411 and the fifth oil hole 412 or the communication between the fifth oil hole 412 and the first elastic cavity 45. In the initial state, under the action of the second elastic member 44, the first spool 42 slides to the first working position, and the fourth oil hole 411 communicates with the fifth oil hole 412, and the pilot oil can enter the first spring cavity 36; when pilot oil is introduced into the first pilot cavity 46, the first spool 42 can slide against the action of the second elastic member 44, so that the fifth oil hole 412 communicates with the first elastic cavity 45, and the first spring cavity 36 can return oil.

[0052] The fuel tank T is connected to the rodless cavity of the actuator 200 through the second holding valve 5. Specifically, the second holding valve 5 includes a second conical spool 51, the second conical spool 51 is slidably assembled in the module body 100, one end where the conical surface of the second conical spool 51 is located extends into the module body 100, and a third plug 55 is provided at the other end of the second conical spool 51 to close the mounting port. A second spring cavity 56 is formed between the second conical spool 51 and the third plug 55, and a second spring 54 is provided in the second spring cavity 56. The two ends of the second spring 54 act on the second conical spool 51 and the third plug 55 respectively. A third oil port 52 and a fourth oil port 53 are arranged around the second conical spool 51 on the module body 100. The third oil port 52 communicates with the fuel tank T through an oil passage, and the fourth oil port 53 communicates with the rodless cavity of the actuator 200 through an oil passage. When the conical surface of the second conical spool 51 seals and abuts against the cavity wall, the fuel tank T and the rodless cavity are not connected; when the second conical spool 51 is pushed and slides open, the fuel tank T and the rodless cavity are connected.

[0053] As a preferred technical solution of this embodiment, pilot oil can be introduced into the second spring cavity 56, and the pilot oil is taken from the rodless cavity of the actuator 200. When the pilot oil enters the second spring cavity 56, if the oil pressure in the rodless cavity is higher than the oil pressure in the fuel tank T, the conical surface of the second conical spool 51 seals and abuts against the cavity wall, and the third oil port 52 and the fourth oil port 53 are not connected, and the rodless cavity is disconnected from the fuel tank T; if the oil pressure in the rodless cavity is lower than the oil pressure in the fuel tank T, the second conical spool 51 can slide open under the action of the pressure difference, and the third oil port 52 and the fourth oil port 53 are connected, and the fuel tank T can replenish oil for the rodless cavity. When the second spring cavity 56 communicates with the oil drain port DR, the acting force of the second spring cavity 56 is small, and the second conical spool 51 can slide open, and the rodless cavity and the fuel tank T are connected.

[0054] The second pilot valve 6 controls the inflow and outflow of pilot oil in the second spring chamber 56 of the second holding valve 5. The second pilot valve 6 can be set as a two-position three-way valve. When the second pilot valve 6 is in the first working position, the pilot oil enters into the second spring chamber 56; when the second pilot valve 6 is in the second working position, the second spring chamber 56 communicates with the drain port DR.

[0055] Specifically, the second pilot valve 6 includes a second valve sleeve 61 and a second valve core 62. The second valve sleeve 61 is assembled in the valve body of the second pilot valve 6. The fourth plug 63 seals the installation port of the valve body of the second pilot valve 6 to form a sealed installation space. The valve body of the second pilot valve is installed on the module body 100 by screws. The fourth plug 63 abuts against the second valve sleeve 61. One end of the second valve core 62 is slidably assembled in the second valve sleeve 61, and the other end of the second valve core 62 extends out of the second valve sleeve 61 and is sleeved with a third elastic member 64. Both ends of the third elastic member 64 act on the fourth plug 63 and the second valve core 62 respectively. The second valve sleeve 61 is provided with a sixth oil hole 611 and a seventh oil hole 612. The sixth oil hole 611 communicates with the second spring chamber 56 through an oil passage, and the seventh oil hole 612 communicates with the rod chamber through an oil passage.

[0056] As a preferred technical solution of this embodiment, the cavity where the third elastic member 64 is located is the second elastic chamber 65, and the second elastic chamber 65 communicates with the drain port DR; a second pilot chamber 66 is formed at one end of the second valve core 62 away from the third elastic member 64, and the second pilot chamber 66 can be accessed with pilot oil. The second valve core 62 slides under the action of the third elastic member 64 and the pilot oil to control the communication between the sixth oil hole 611 and the seventh oil hole 612 or the communication between the sixth oil hole 611 and the second elastic chamber 65. In the initial state, under the action of the third elastic member 64, the second valve core 62 is in the first working position, the sixth oil hole 611 communicates with the seventh oil hole 612, and the pilot oil can enter the second spring chamber 56; when pilot oil is introduced into the second pilot chamber 66, the second valve core 62 can slide against the action of the third elastic member 64 to make the sixth oil hole 611 communicate with the second elastic chamber 65, and the second spring chamber 56 communicates with the drain port DR.

[0057] The control valve 7 controls the inflow and outflow of pilot oil in the first pilot chamber 46 of the first pilot valve 4; and / or, the control valve 7 controls the inflow and outflow of pilot oil in the second pilot chamber 66 of the second pilot valve 6. In this embodiment, one control valve 7 is provided, and one control valve 7 can simultaneously control the pilot oil to enter the first pilot chamber 46 and the second pilot chamber 66.

[0058] The control valve 7 can be set as a solenoid valve. The control valve 7 includes a control valve sleeve 71, a control valve spool 72, and an electromagnetic assembly 73. A fifth oil port 74, a sixth oil port 75, and an oil return port 76 are arranged around the control valve 7 within the module body 100. The fifth oil port 74 is connected to the pilot oil, the sixth oil port 75 is communicated with both the first pilot chamber 46 and the second pilot chamber 66, and the oil return port 76 is communicated with the oil tank T. In the initial state, the control valve 7 is de-energized. Under the action of the spring, the control valve spool 72 controls the communication between the sixth oil port 75 and the oil return port 76, so that both the first pilot chamber 46 and the second pilot chamber 66 are communicated with the oil tank T. After the control valve 7 is energized, the control valve spool 72 slides against the spring force, enabling the sixth oil port 75 to communicate with the fifth oil port 74, and the pilot oil can enter the first pilot chamber 46 and the second pilot chamber 66.

[0059] As a preferred technical solution of this embodiment, the pilot oil introduced into the fifth oil port 74 is selected from the higher pressure in the rod chamber and the accumulator 1. A second shuttle valve 82 can be used to select the higher pressure in the rod chamber and the accumulator 1 as the pilot oil. Specifically, the structure of the second shuttle valve 82 is the same as that of the first shuttle valve 81. The second shuttle valve 82 includes a second shuttle valve spool 821 and a second steel ball 822. The second steel ball 822 is located at one axial end of the second shuttle valve spool 821. A third oil inlet 823, a fourth oil inlet 824, and a second oil outlet 825 are arranged around the second shuttle valve 82 within the module body 100. The third oil inlet 823 is communicated with the rod chamber, the fourth oil inlet 824 is communicated with the accumulator 1, and the second oil outlet 825 is communicated with the fifth oil port 74. Through the second shuttle valve 82, the higher oil pressure in the rod chamber and the accumulator 1 can be selected and discharged through the second oil outlet 825. Since at least one of the rod chamber and the rodless chamber of the actuator 200 is a high-pressure chamber, and the pressure difference between the rodless chamber and the accumulator 1 is small, the oil pressure discharged from the second oil outlet 825 is relatively high. The pilot oil discharged from the second oil outlet 825 enters the first pilot chamber 46 and the second pilot chamber 66 under the control of the control valve 7 to control the commutation of the first pilot valve 4 and the second pilot valve 6, and further control the states of the first holding valve 3 and the second holding valve 5.

[0060] To prevent the pressure of the accumulator 1 from being too high, a safety oil circuit can be provided for the accumulator 1. One end of the safety oil circuit is communicated with the accumulator 1, and the other end is communicated with the oil tank T. A safety valve group 9 is arranged on the safety oil circuit. The safety valve group 9 includes a safety valve 91 and a check valve 92, which are arranged in parallel. When the oil pressure of the accumulator 1 exceeds the pressure set by the safety valve 91, the accumulator 1 can drain oil through the safety valve 1. When the oil pressure in the accumulator 1 is too low, the oil tank T can supply oil to the accumulator 1 through the check valve 92.

[0061] To ensure safety, a manual oil drain assembly 10 is also provided. Specifically, the accumulator 1 is also connected to the fuel tank T through an oil drain passage 20. The manual oil drain assembly 10 is provided on the oil drain passage 20. The manual oil drain assembly 10 includes an oil drain screw 101 and a nut 102. During normal operation, the oil drain screw 101 can extend into the oil drain passage 20 and is locked by the nut 102 to block the oil drain passage 20. In case of a failure, the nut 102 can be unscrewed to loosen the oil drain screw 101, so that the accumulator 1 returns oil through the oil drain passage 20 to achieve manual pressure relief.

[0062] When the stability module of this embodiment is applied to a loader, when the vehicle speed is relatively low, the control valve 7 is not powered on, and a small-area fluid flow is realized between the rodless chamber of the boom and the accumulator 1 through the filling valve 2, ensuring that the pressure difference between the rodless chamber and the accumulator 1 is always within a suitable range, thereby realizing the automatic balance of the pressure of the rodless chamber oil circuit and the accumulator in the low-speed state; when the vehicle speed of the loader is relatively high, the control valve 7 is powered on, and a large-area fluid flow is realized between the rodless chamber of the boom and the accumulator 1, and between the rod chamber of the boom and the fuel tank T through the first holding valve 3 and the second holding valve 5, thereby realizing the balance of pressure in the high-speed case. The stability module of this embodiment can realize the switching between high speed and low speed by controlling the power on and off of the control valve 7.

[0063] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the knowledge scope of those of ordinary skill in the art, various changes can be made without departing from the purpose of the present invention.

Claims

1. A stabilization module, characterized in that: include: Accumulator (1); A charging valve (2), the charging valve (2) controls the connection between the accumulator (1) and the rodless chamber, and the charging valve (2) switches the working position under the action of the oil pressure of the accumulator (1) and the rodless chamber. When the oil pressure in the rodless chamber is higher than the oil pressure in the accumulator (1), the charging valve (2) is in the first working position, and the oil in the rodless chamber can flow to the accumulator (1) through the charging valve (2); when the oil pressure in the accumulator (1) is higher than the oil pressure in the rodless chamber, the charging valve (2) is in the second working position, and the oil in the accumulator (1) can flow to the oil tank T through the charging valve (2); when the oil pressure in the rodless chamber and the oil pressure in the accumulator (1) are basically the same, the charging valve (2) is in the middle position, and the accumulator (1) and the rodless chamber are not connected.

2. A stabilization module according to claim 1, characterized in that: It also includes a first holding valve (3) and a first pilot valve (4), wherein the first holding valve (3) controls the on-off connection between the accumulator (1) and the rodless chamber, and the first pilot valve (4) controls the pilot oil to enter and exit the first spring chamber (36) of the first holding valve (3) so that the first holding valve (3) switches the working state.

3. A stabilization module according to claim 2, characterized in that: The pilot oil of the first spring chamber (36) is taken from the higher oil pressure in the accumulator (1) and the rodless chamber.

4. A stabilization module according to any one of claims 2-3, characterized in that: The invention also comprises a second holding valve (5) and a second pilot valve (6), wherein the second holding valve (5) controls the on-off between the rod chamber and the oil tank T, and the second pilot valve (6) controls the pilot oil to flow in and out of the second spring chamber (56) of the second holding valve (5) so that the second holding valve (5) switches the working state.

5. A stabilization module according to claim 4, characterized in that: The pilot oil of the second spring chamber (56) is taken from the rod chamber.

6. A stabilization module according to claim 4, characterized in that: The first pilot valve (4) and / or the second pilot valve (6) switches working state under the action of the control valve (7).

7. A stabilization module according to claim 6, characterized in that: The control valve (7) controls the pilot oil to flow in and out of the first pilot chamber (46) of the first pilot valve (4); and / or the control valve (7) controls the pilot oil to flow in and out of the second pilot chamber (66) of the second pilot valve (6).

8. A stabilization module according to claim 7, characterized in that: The pilot oil of the first pilot chamber (46) and / or the second pilot chamber (66) is taken from the higher oil pressure in the rod chamber and the accumulator (1).

9. A stabilization module according to claim 1, characterized in that: The invention also comprises a safety valve group (9), wherein the accumulator (1) is connected to the oil tank T via the safety valve group (9), and the safety valve group (9) comprises a safety valve (91) and a one-way valve (92). When the oil pressure of the accumulator (1) is higher than the set pressure, the accumulator (1) discharges oil via the safety valve (91); when the oil pressure of the accumulator (1) is lower than the oil pressure of the oil tank T, the oil tank T can replenish oil for the accumulator (1) via the one-way valve (92).

10. A stabilization module according to claim 1, characterized in that: It also comprises a manual oil drain component (10); the accumulator (1) is also connected to the oil tank T via an oil drain oil circuit (20); the manual oil drain component (10) controls the on / off of the oil drain oil circuit (20).

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