A liquid composite node with adjustable multi-directional stiffness

Abstract

The present invention discloses a multi-directional, adjustable-stiffness liquid composite node. The node comprises a core shaft with a core ball in the middle, a rubber layer vulcanized and bonded around the core ball, and an inner sleeve vulcanized and bonded to the rubber layer. A front cavity and a rear cavity, each with a rubber layer at the bottom and surrounding walls, are disposed within the inner sleeve on the front and rear sides of the liquid composite node, respectively. A flow channel connecting the front and rear cavities is disposed on the core ball. The front and rear cavities are flat in the middle, with radially recessed ends at the bottoms of the cavities forming left and right grooves, respectively, and forming the right groove wall of the left groove and the left groove wall of the right groove. The front and rear cavities and the flow channel are filled with liquid. Advantages of the present invention include improving the stiffness ratio (also known as the dynamic-static stiffness ratio) of the liquid composite node under both high-frequency and low-frequency vibration conditions, and appropriately increasing the axial stiffness of the liquid composite node while maintaining radial stiffness.

Description

Technical Field

[0001] The invention relates to a liquid composite node with adjustable multi-directional stiffness, belonging to the technical field of bogie swing arm joints. Background Art

[0002] The fluid composite joint connecting the bogie and the slewing arm is the joint connecting the bogie and the slewing arm. Because the slewing arm's terminal end is connected to the wheelset axlebox, the train's traction and braking forces are borne by this joint. Therefore, the fluid composite joint primarily bears longitudinal loads along the train's direction of travel.

[0003] With the rapid development of rail transit, trains are running at ever-increasing speeds. Due to the impact of uneven road surfaces, even the slightest undulations in the tracks can cause high-frequency loads on high-speed trains, leading to high-frequency vibrations. Furthermore, external factors such as bridges and tunnels can also cause high-frequency vibrations when trains travel at high speeds.

[0004] According to dynamic requirements, when the arm joint is running in a straight line at high speed (generating high-frequency vibration), it must provide a large radial stiffness along the running direction to ensure operational stability and increase the critical speed. When passing through a curve (generating low-frequency, large-amplitude vibration), it must provide a small stiffness to ensure good curve performance and reduce wear. Because the liquid composite node is more prone to deflection and torsion when the stiffness is low, the arm is easier to swing, and the wheel can adaptively reduce the angle of attack with the track, thereby reducing wear. The stiffness required for high-frequency vibration is known in the industry as dynamic stiffness, while the stiffness required for low-frequency vibration is known in the industry as static stiffness. Because ordinary joints cannot achieve a large dynamic-static stiffness ratio, a new joint with both of these characteristics is needed: a liquid composite node with a large dynamic-static stiffness ratio.

[0005] In addition, when designing the liquid rubber node, while considering the large dynamic-static stiffness ratio, the small-diameter shaft stiffness ratio must also be fully considered. That is, relative to the radial stiffness, the radial stiffness must be appropriately increased to avoid excessive lateral swing of the car body and bogie relative to the wheelset.

[0006] Traditional liquid composite joints primarily utilize two symmetrical front and rear cavities within the rubber components on either side of the joint. These are connected via flow channels and pre-filled with a sealed, incompressible (viscous) liquid. Under load, the volumes of the two cavities change, and the liquid flowing between them creates damping, dissipating vibration energy and achieving vibration attenuation. However, this approach fails to increase the dynamic-to-static stiffness ratio or reduce the radial-to-axial stiffness ratio. Summary of the Invention

[0007] The technical problems to be solved by the present invention are: how to improve the stiffness ratio (or dynamic-static stiffness ratio) of the liquid composite node under two different working conditions of high-frequency vibration and low-frequency vibration, and how to moderately increase the axial stiffness of the liquid composite node while meeting the radial stiffness.

[0008] In view of the above problems, the technical solution proposed by the present invention is:

[0009] A multi-directional stiffness-adjustable liquid composite node comprises a core shaft with a core shaft ball in the middle, a rubber layer vulcanized and bonded around the core shaft ball, and an inner sleeve vulcanized and bonded to the rubber layer at its periphery. A front cavity and a rear cavity, whose cavity bottoms and circumferential walls are made of rubber layers, are respectively arranged in the inner sleeves on the front and rear sides of the liquid composite node; a flow channel connecting the front cavity and the rear cavity is provided on the core shaft ball; the middle portions of the front cavity and the rear cavity are flat, and the two side ends of the cavity bottoms of the two are radially sunken to form a left-side pressure groove and a right-side pressure groove wall, and to form the left-side pressure groove wall and the left-side pressure groove wall; the front cavity, the rear cavity and the flow channel are filled with liquid.

[0010] The front and rear outer peripheries of the middle part of the core shaft ball of the core shaft are cylindrical surfaces, so that the central area of ​​the rubber layer at the middle bottom of the front cavity and the rear cavity is a middle uniform area with uniform thickness.

[0011] The left-side pressing groove and the right-side pressing groove are V-shaped grooves, and the wall surfaces of the right-side pressing groove wall and the left-side pressing groove wall are inclined surfaces.

[0012] The left and right ends of the inner sleeve are respectively retracted inward to form a left retaining ring and a right retaining ring, the inner wall of the left retaining ring is a left stop inner conical surface inclined to the left, and the inner wall of the right retaining ring is a right stop inner conical surface inclined to the right; the end faces of the two ends of the core shaft ball are the left outer conical surface of the core shaft ball and the right outer conical surface of the core shaft ball corresponding to the left stop inner conical surface and the right stop inner conical surface respectively, the rubber layer between the left stop inner conical surface and the left outer conical surface of the core shaft ball is the left compression expansion end of the rubber layer, and the rubber layer between the right stop inner conical surface and the right outer conical surface of the core shaft ball is the right compression expansion end of the rubber layer; there is a distance between the left and right ends of the inner sleeve and the core shaft, forming a left compression expansion space that can enable the left compression expansion end of the rubber layer to expand to the left and a right compression expansion space that can enable the right compression expansion end of the rubber layer to expand to the right.

[0013] The left compression-expanding end of the rubber layer and the right compression-expanding end of the rubber layer are arranged in an inclined manner.

[0014] The left compression-expanding end of the rubber layer and the right compression-expanding end of the rubber layer form an angle of 40-60 degrees relative to the axis of the core shaft.

[0015] The front mold cavity and the rear mold cavity are arranged by opening a front frame opening and a rear frame opening on the inner sleeve body on the front and rear sides of the liquid composite node, and respectively setting a front sealing cover plate and a rear sealing cover plate on the front frame opening and the rear frame opening. The front mold cavity is formed by the front sealing cover plate, the front frame opening and the rubber layer, and the rear mold cavity is formed by the rear sealing cover plate, the rear frame opening and the rubber layer.

[0016] The wall surfaces of the right and left pressure groove walls are vertical surfaces perpendicular to the axis of the core shaft; radially stretched left and right baffle plates are respectively provided on the inner walls at both ends of the front sealing cover plate and the rear sealing cover plate, and the left and right baffle plates are respectively attached to the right and left pressure groove walls and can make relative vertical sliding movements, dividing the front cavity and the rear cavity from left to right into a left buffer zone, a middle radial pressure adjustment zone and a right buffer zone.

[0017] A left buffer flow channel connecting the left buffer zone and the middle radial pressure regulating zone is provided on the left baffle plate, and a right buffer flow channel connecting the right buffer zone and the middle radial pressure regulating zone is provided on the right baffle plate.

[0018] The radial cross-sections of the front cavity and the rear cavity are semi-fan-shaped, and the curvature r of the semi-fan-shaped is 90-120°. Beneficial effects

[0019] When a train encounters high-frequency vibrations while running in a straight line, the stiffness of the liquid composite node along the running direction increases instantly, ensuring operational stability and increasing the critical speed. When the train passes through a curve or the vibration frequency decreases during acceleration or deceleration, the stiffness of the liquid composite node along the running direction decreases to meet the requirements of reducing wheel-rail wear or buffering longitudinal load impact. While achieving the above-mentioned stiffness change requirements, the axial stiffness can be increased to an ideal level to avoid large lateral swings of the train body and bogie relative to the wheelset. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a three-dimensional schematic diagram of the liquid composite node in Example 1 with the outer shell hidden;

[0021] Figure 2 for Figure 1 A three-dimensional schematic diagram in which the front sealing cover plate and the rear sealing cover plate are omitted;

[0022] Figure 3 This is a schematic axial cross-sectional view of the liquid composite node described in Example 1;

[0023] Figure 4 for Figure 3 A partial enlarged view of

[0024] Figure 5 Schematic diagram of radial cross-section of the liquid composite node described in Example 1;

[0025] Figure 6This is a schematic axial cross-sectional view of the liquid composite node described in Example 2;

[0026] Figure 7 for Figure 6 A partial enlarged schematic diagram;

[0027] Figure 8 This is a partial schematic cross-sectional view of the liquid composite node described in Example 3;

[0028] Figure 9 This is a three-dimensional schematic diagram of the left baffle plate described in Example 3.

[0029] In the figure: 1. Mandrel; 101. Mandrel ball; 1010. Flow channel; 1011. Left outer conical surface of mandrel ball; 1012. Right outer conical surface of mandrel ball; 2. Rubber layer; 201. Left compression end of rubber layer; 202. Right compression end of rubber layer; 203. Middle uniform area; 3. Inner sleeve; 301. Left retaining ring; 3011. Inner conical surface of left stopper; 302. Right retaining ring; 3021. Inner conical surface of right stopper; 303. Front sealing cover Plate; 304, rear sealing cover plate; 4, outer shell; 5, front cavity; 6, rear cavity; 7, left pressure groove; 701, right pressure groove wall; 8, right pressure groove; 801, left pressure groove wall; 9, left compression expansion space; 10, right compression expansion space; 11, left baffle plate; 110, left buffer flow channel; 12, right baffle plate; 120, right buffer flow channel; 13, left buffer zone; 14, middle radial pressure adjustment zone; 15, right buffer zone. DETAILED DESCRIPTION

[0030] The present invention will be further described below with reference to the embodiments and accompanying drawings: Example 1

[0031] like Figure 1 As shown in FIG3 , a liquid composite node with adjustable multi-directional stiffness comprises a core shaft 1 with a core shaft ball 101 in the middle, a rubber layer 2 vulcanized and bonded around the core shaft ball 101, and an inner sleeve 3 vulcanized and bonded to the rubber layer 2 at its periphery, and is characterized in that: a front cavity 5 and a rear cavity 6 with the bottom and the surrounding wall of the cavity being the rubber layer 2 are respectively provided in the inner sleeve 3 on the front and rear sides of the liquid composite node; a flow channel 1010 connecting the front cavity 5 and the rear cavity 6 is provided on the core shaft ball 101; the middle parts of the front cavity 5 and the rear cavity 6 are flat, and the two side ends of the cavity bottom of the two are radially sunken to form a left pressure groove 7 and a right pressure groove 8, and a right pressure groove wall 701 of the left pressure groove 7 and a left pressure groove wall 801 of the right pressure groove 8 are formed; the front cavity 5, the rear cavity 6 and the flow channel 1010 are filled with liquid.

[0032] This arrangement, on the one hand, allows for low vibration frequencies and large amplitudes, especially when the train accelerates or decelerates, to cause the load impact along the train's direction of travel to allow time for the liquid to flow through flow channel 1010 between the front and rear cavities 5 and 6, compressing one of the two cavities while expanding the other. This results in a lower stiffness for the liquid composite node. At higher vibration frequencies, the liquid within flow channel 1010 continuously reverses direction in a very short period of time, preventing it from maintaining a directional flow for a long period of time. As the frequency increases, the liquid within flow channel 1010 approaches a state of non-directional flow, making it difficult to compress the front and rear cavities 5 and 6, thereby increasing stiffness. Furthermore, by flattening the central portions of the front and rear cavities 5 and 6, it becomes even more difficult for the liquid within the front and rear cavities 5 and 6, away from the flow channel openings, to quickly flow toward flow channel 1010, directly increasing the stiffness of the liquid composite node along the train's direction of travel. This achieves an increased dynamic-static stiffness ratio (more accurately, the ratio of high-frequency vibration stiffness to low-frequency vibration stiffness). On the other hand, when the liquid composite node is impacted by a rightward load, the liquid in the left pressure groove 7 exerts pressure on the right pressure groove wall 701, causing the right pressure groove wall 701 to generate a corresponding reaction force, thereby increasing the rightward stiffness of the liquid composite node. When the liquid composite node is impacted by a leftward load, the liquid in the right pressure groove 8 exerts pressure on the left pressure groove wall 801, causing the left pressure groove wall 801 to generate a corresponding reaction force, thereby increasing the leftward stiffness of the liquid composite node.

[0033] In summary, the present application sets a front cavity 5 and a rear cavity 6 in the liquid composite node, and adopts a flat setting for the front cavity 5 and the rear cavity 6, which can not only meet the radial low stiffness requirements during low-frequency vibration, ensuring that the train has good comfort during starting, acceleration and braking, as well as good ability to pass through curves, but also meet the high stiffness requirements during high-frequency vibration, ensuring the stability of the train during high-speed operation and further improving the critical speed of the train operation. At the same time, the left and right pressure grooves 7 and 8 are respectively set at the two side ends of the bottom of the front cavity 5 and the rear cavity 6, which improves the axial stiffness of the liquid composite node and can prevent the car body and the bogie from swinging too much in the lateral direction relative to the wheelset.

[0034] The front and rear outer peripheries of the middle part of the core shaft ball 101 are cylindrical surfaces, so that the central area of ​​the rubber layer 2 at the bottom of the middle cavity of the front cavity 5 and the rear cavity 6 is a middle uniform area 203 with uniform thickness, which is conducive to quantitative control of the front and rear radial stiffness.

[0035] like Figure 3 、 4As shown, the left and right grooves 7 and 8 are V-shaped, with the right and left groove walls 701 and 801 having inclined surfaces. Thus, the normal forces F1 and F2 acting on the right and left groove walls 701 and 801, respectively, have rightward and leftward components F01 and F02, respectively. These forces F01 and F02 increase the axial stiffness of the liquid composite node. Furthermore, because the normal forces F1 and F2 are at oblique angles relative to the axial and radial directions of the liquid composite node, this structure not only enhances axial stiffness but also makes the liquid composite node more compliant with the multi-directional force and torsion characteristics.

[0036] The left and right ends of the inner sleeve 3 are respectively gathered inward to form a left retaining ring 301 and a right retaining ring 302. The inner wall of the left retaining ring 301 is a left stop inner conical surface 3011 inclined to the left, and the inner wall of the right retaining ring 302 is a right stop inner conical surface 3021 inclined to the right; the end faces of the core shaft ball 101 at both ends are the core shaft ball left outer conical surface 1011 and the core shaft ball right outer conical surface 1012 corresponding to the left stop inner conical surface 3011 and the right stop inner conical surface 3021 respectively. The rubber layer between the conical surface 3011 and the left outer conical surface 1011 of the core ball is the left compression end 201 of the rubber layer, and the rubber layer between the right stop inner conical surface 3021 and the right outer conical surface 1012 of the core ball is the right compression end 202 of the rubber layer. A gap exists between the left and right ends of the inner sleeve 3 and the core shaft 1, forming a left compression space 9 that allows the left compression end 201 of the rubber layer to expand to the left, and a right compression space 10 that allows the right compression end 202 of the rubber layer to expand to the right. In this way, when the front cavity 5 and the rear cavity 6 are compressed, the left compression end 201 and the right compression end 202 of the rubber layer can expand to the left and right, respectively, thereby meeting the radially weak stiffness requirements during low-frequency, large-amplitude vibrations.

[0037] The left and right compression-expanding ends 201 and 202 of the rubber layer are tilted. Furthermore, the left and right compression-expanding ends 201 and 202 of the rubber layer have an angle of 40-60 degrees relative to the axis of the core shaft 1. This allows the normal forces f1 and f2 of the left and right compression-expanding ends 201 and 202 of the rubber layer, respectively, acting on the left and right outer conical surfaces 1011 and 1012 of the core shaft ball, to form rightward and leftward axial components f01 and f02, respectively, thereby achieving greater axial stiffness. This angle ensures that the radial force acting on the liquid composite node is a relatively weak shear force with a large stroke, thus meeting the requirements for weak radial stiffness during low-frequency and large-amplitude vibrations.

[0038] like Figure 1As shown in FIG. 5 , the front cavity 5 and the rear cavity 6 are configured by providing a front frame opening and a rear frame opening on the inner casing 3 at the front and rear sides of the liquid composite node, and respectively providing a front sealing cover plate 303 and a rear sealing cover plate 304 on the front and rear frame openings. The front sealing cover plate 303, the front frame opening, and the rubber layer 2 form the front cavity 5, while the rear sealing cover plate 304, the rear frame opening, and the rubber layer 2 form the rear cavity 6. This configuration is intended to facilitate placement and demolding of the vulcanization mold.

[0039] Here, an outer shell 4 is provided outside the inner shell 3 .

[0040] like Figure 5 As shown, the radial cross-sections of the front cavity 5 and the rear cavity 6 are semi-sector-shaped, and the arc r of the semi-sector is 90-120°. Example 3

[0041] like Figure 6 、 7 See Figure 9 The difference from the first embodiment is that the wall surfaces of the right pressure groove wall 701 and the left pressure groove wall 801 are vertical surfaces perpendicular to the axis of the core shaft 1; radially stretched left baffle plates 11 and right baffle plates 12 are respectively provided on the inner walls of both ends of the front sealing cover plate 303 and the rear sealing cover plate 304. The left baffle plates 11 and the right baffle plates 12 are respectively attached to the right pressure groove wall 701 and the left pressure groove wall 801 and can slide vertically relative to each other, dividing the front cavity 5 and the rear cavity 6 from left to right into a left buffer zone 13, a middle radial pressure adjustment zone 14 and a right buffer zone 15. In this way, the right pressure groove wall 701 and the left pressure groove wall 801 directly provide axial pressure to the left baffle plate 11 and the right baffle plate 12 respectively, ensuring that the axial stiffness of the liquid composite node fully meets the design requirements, but does not affect the radial small stiffness requirements during low-frequency vibration. During high-frequency vibration, since the two sides of the middle radial pressure adjustment area 14 are blocked by the left baffle plate 11 and the right baffle plate 12, the incompressible liquid is difficult to diffuse to both sides, and the liquid in the flow channel 1010 tends to a state where it cannot flow in a directional manner as the frequency increases. This is very beneficial to the sudden increase in the radial stiffness of the liquid composite node during high-frequency vibration.

[0042] There are small gaps between the left rib plate 11 and the right side groove wall 701 and between the right rib plate 12 and the left side groove wall 801 for filling liquid into the left buffer zone 13 and the right buffer zone 15 . Example 3

[0043] like Figure 8 、 9As shown, this embodiment differs from the second embodiment in that a left buffer channel 110 is provided on the left rib plate 11, connecting the left buffer zone 13 and the middle radial pressure adjustment zone 14. A right buffer channel 120 is provided on the right rib plate 12, connecting the right buffer zone 15 and the middle radial pressure adjustment zone 14. Because the outer sides of the left buffer zone 13 and the right buffer zone 15 are respectively the left and right compression expansion ends 201 and 202 of the rubber layer, which can expand outward to the left and right, the left and right buffer zones 13 and 15 are relatively weak areas. In this embodiment, the middle radial pressure adjustment zone 14 is connected to the left buffer zone 13 and the right buffer zone 15 through the left buffer channel 110 and the right buffer channel 120 respectively, which can not only ensure the high stiffness requirement during high-frequency vibration, but also ensure that the liquid in the left buffer channel 110 and the right buffer channel 120 cannot flow in a directional manner during high-frequency vibration. At the same time, during low-frequency vibration, the liquid in the middle radial pressure adjustment zone 14 can be exchanged with the liquid in the left buffer zone 13 and the right buffer zone 15 through the left buffer channel 110 and the right buffer channel 120 respectively, thereby meeting the requirement of reducing the radial stiffness of the liquid composite node during low-frequency vibration.

[0044] The above embodiments are only used to more clearly describe the present invention and cannot be regarded as limiting the scope of protection covered by the present invention. Any modifications in equivalent forms should be regarded as falling within the scope of protection covered by the present invention.

Claims

1. A multi-directional stiffness adjustable liquid composite node, comprising a core shaft (1) having a core shaft ball (101) in the middle, a rubber layer (2) surrounding the core shaft ball (101) and vulcanized and bonded, and an inner sleeve (3) vulcanized and bonded to the rubber layer at the periphery of the rubber layer (2), characterized in that: A front cavity (5) and a rear cavity (6) with a cavity bottom and cavity peripheral wall formed of a rubber layer (2) are respectively provided in the inner sleeve (3) on the front and rear sides of the liquid composite node; a flow channel (1010) connecting the front cavity (5) and the rear cavity (6) is provided on the core shaft ball (101); the middle parts of the front cavity (5) and the rear cavity (6) are flat, and the two side ends of the cavity bottom are radially sunken to form a left pressure groove (7) and a right pressure groove (8), and to form a right pressure groove wall (701) of the left pressure groove (7) and a left pressure groove wall (801) of the right pressure groove (8); the front cavity (5), the rear cavity (6) and the flow channel (1010) are filled with liquid; the left and right ends of the inner sleeve (3) are provided with a flow channel (1010) connecting the front cavity (5) and the rear cavity (6); ... The left retaining ring (301) and the right retaining ring (302) are respectively gathered inward to form a left retaining ring (301) and a right retaining ring (302), the inner wall of the left retaining ring (301) is a left stop inner conical surface (3011) inclined to the left, and the inner wall of the right retaining ring (302) is a right stop inner conical surface (3021) inclined to the right; the end faces of the two ends of the core shaft ball (101) are a core shaft ball left outer conical surface (1011) and a core shaft ball right outer conical surface (1012) corresponding to the left stop inner conical surface (3011) and the right stop inner conical surface (3021), respectively; the rubber layer between the left stop inner conical surface (3011) and the core shaft ball left outer conical surface (1011) is the left compression end (201) of the rubber layer, and the right stop inner conical surface (3021) and the core shaft ball right outer conical surface (1021) are respectively formed. 12) is the right expansion end (202) of the rubber layer; there is a gap between the left and right ends of the inner sleeve (3) and the core shaft (1), forming a left expansion space (9) that enables the left expansion end (201) of the rubber layer to expand to the left, and a right expansion space (10) that enables the right expansion end (202) of the rubber layer to expand to the right; the front cavity (5) and the rear cavity (6) are arranged by opening a front frame opening and a rear frame opening on the inner sleeve (3) at the front and rear sides of the liquid composite node, and respectively setting a front sealing cover plate (303) and a rear sealing cover plate (304) on the front frame opening and the rear frame opening, and forming a front cavity (5) by the front sealing cover plate (303), the front frame opening and the rubber layer (2), and a rear sealing cover plate (304) on the front and rear sides of the liquid composite node. The cover plate (304), the rear frame opening and the rubber layer (2) form a rear cavity (6); the wall surfaces of the right pressure groove wall (701) and the left pressure groove wall (801) are vertical surfaces perpendicular to the axis of the core shaft (1); radially stretched left baffle plates (11) and right baffle plates (12) are respectively provided on the inner walls of both ends of the front sealing cover plate (303) and the rear sealing cover plate (304); the left baffle plates (11) and the right baffle plates (12) are respectively attached to the right pressure groove wall (701) and the left pressure groove wall (801) and can slide vertically relative to each other, thereby dividing the front cavity (5) and the rear cavity (6) from left to right into a left buffer zone (13), a middle radial pressure adjustment zone (14) and a right buffer zone (15).

2. The multi-directional stiffness adjustable liquid composite node according to claim 1, characterized in that: The front and rear outer peripheries of the center of the core ball (101) of the core are cylindrical surfaces, so that the central area of ​​the rubber layer (2) at the bottom of the front cavity (5) and the rear cavity (6) is a central uniform area (203) with uniform thickness.

3. The multi-directional stiffness adjustable liquid composite node according to claim 1, characterized in that: The left-side pressing groove (7) and the right-side pressing groove (8) are V-shaped grooves, and the wall surfaces of the right-side pressing groove wall (701) and the left-side pressing groove wall (801) are inclined surfaces.

4. The multi-directional stiffness adjustable liquid composite node according to claim 1, characterized in that: The left compression-expanding end (201) of the rubber layer and the right compression-expanding end (202) of the rubber layer are arranged in an inclined manner.

5. The multi-directional stiffness adjustable liquid composite node according to claim 4, characterized in that: The left compression-expanding end (201) of the rubber layer and the right compression-expanding end (202) of the rubber layer have an angle of 40-60° relative to the axis of the core shaft (1).

6. The multi-directional stiffness adjustable liquid composite node according to claim 1, characterized in that: A left buffer flow channel (110) is provided on the left baffle plate (11) and connects the left buffer zone (13) and the middle radial pressure regulating zone (14). A right buffer flow channel (120) is provided on the right baffle plate (12) and connects the right buffer zone (15) and the middle radial pressure regulating zone (14).

7. The multi-directional stiffness adjustable liquid composite node according to any one of claims 1 to 3, characterized in that: The radial cross-sections of the front cavity (5) and the rear cavity (6) are semi-sector-shaped, and the arc angle r of the semi-sector is 90-120°.

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