Spherical hinge hydraulic oil cylinder mechanism

Abstract

The spherical hinge hydraulic oil cylinder mechanism comprises a cylinder body, a piston, a ball head dowel bar and a sealing assembly, a notch is formed in the bottom end of the cylinder body, the piston is arranged in the cylinder body and connected with the inner wall face of the cylinder body in a sliding mode, the ball head end of the ball head dowel bar penetrates through the notch from bottom to top and abuts against the inner wall of the piston in a rotating mode, and the rod end of the ball head dowel bar extends out of the cylinder body. A gap allowing the ball head dowel bar to rotate is formed between the outer wall of the ball head dowel bar and the groove side wall of the notch; the sealing assembly is arranged between the rod wall of the ball dowel bar and the inner wall face of the bottom end of the cylinder body so as to seal the gap. The universal rotation function of the spherical hinge and the axial telescopic function of the column type oil cylinder are integrated in one oil cylinder, the ball head dowel bar can axially slide on one hand and can freely rotate within a certain angle on the other hand, the integration of axial movement and universal rotation of the dowel bar is achieved in one oil cylinder, and therefore the universal rotation function of the ball hinge and the axial telescopic function of the column type oil cylinder are achieved. The internal oil pressure of the oil cylinder can directly act on the piston, so that the rotation constraint of the system on the dowel bar is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic mechanical structures, and more specifically to a ball-jointed hydraulic cylinder mechanism. Background Art

[0002] Column cylinders and ball joints are two commonly used mechanisms in machinery. In actual use, sometimes it is necessary to combine these two mechanisms to meet specific functional requirements. For example, in hydraulic shock absorbers, the force-bearing rod often needs to rotate in multiple directions. At this time, it is necessary to connect the ball joint and the cylinder in series. In such mechanisms that require both axial movement of the cylinder and multi-directional rotation of the ball joint, when the angular range is not too large, the rotation function of the ball joint can be integrated into the internal mechanism of the cylinder. In addition, in axial hydraulic seismic isolation mechanisms, the force transmission rod often faces fatigue problems. The rotation constraint of the ball joint is not conducive to the fatigue life of the force transmission rod. When the rotation constraint of the ball joint seriously affects the fatigue strength of the structure, reducing the rotation constraint of the ball joint has important practical significance.

[0003] Therefore, how to provide a ball-joint hydraulic cylinder mechanism that can not only realize the integration of the ball-joint mechanism and the cylinder mechanism but also greatly reduce the rotation constraint of the force transmission rod through appropriate structural design, replace the simple series connection of ball-joint + cylinder, and save manufacturing costs, is a problem that technical personnel in this field urgently need to solve. Utility Model Content

[0004] In view of this, the utility model provides a ball joint hydraulic cylinder mechanism, which integrates the universal rotation function of the ball joint and the axial telescopic function of the ordinary column cylinder into one cylinder, and directly applies the oil pressure to the rotating body that realizes the ball joint function, thereby reducing the rotation constraint of the mechanism on the force transmission rod.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A ball joint hydraulic cylinder mechanism comprises a cylinder body, a piston, a ball head force transmission rod and a sealing assembly;

[0007] A slot is provided at the bottom end of the cylinder body, the piston is arranged in the cylinder body and is slidably connected to the inner wall surface of the cylinder body, the ball end of the ball head force transmission rod passes through the slot from bottom to top and is rotatably abutted against the inner wall of the piston, and the rod end extends out of the cylinder body, and a gap is provided between the outer wall of the ball head force transmission rod and the groove side wall of the slot to allow the ball head force transmission rod to rotate; the sealing assembly is arranged between the rod wall of the ball head force transmission rod and the inner wall surface of the bottom end of the cylinder body to close the gap.

[0008] The beneficial effect of the above technical solution is that the piston slides axially along the inner wall of the cylinder, and the ball head of the ball head force transfer rod can make universal rotation along the center of the ball in the piston, so that the ball head force transfer rod and the piston form a ball joint structure. On the one hand, the ball head force transfer rod can slide axially along the cylinder body, and on the other hand, it can also rotate freely around the center of the ball head within a certain angle, thereby realizing the fusion of axial movement and universal rotation of the force transfer rod inside the cylinder. When necessary, it can also directly apply the oil pressure inside the cylinder to the ball joint rotating body to reduce the system's rotation constraint on the force transfer rod.

[0009] Preferably, the piston is an annular piston, one side of which is a cylindrical surface and slides against the inner wall of the cylinder body, and the other side is a spherical surface and rotates against the spherical surface of the ball head force transmission rod. The annular surface adapts to the inner wall of the cylinder body and the spherical surface of the ball head force transmission rod. The protruding part of the ball head can penetrate into the annular cavity of the piston, and the sliding of the piston drives the axis of the ball head force transmission rod to slide, and the ball head can rotate in the annular cavity of the piston. The force transmission rod of the oil cylinder can slide axially and rotate universally.

[0010] Preferably, the sealing assembly comprises a slide plate, a first sealing ring, a spherical sealing ring, a second sealing ring and a third sealing ring;

[0011] A convex ring is fixed to the inner wall of the bottom end of the cylinder body, and the rod end of the ball head force transmission rod can slide out of the inner cavity of the convex ring, and there is a gap between the rod wall and the inner wall of the convex ring to allow the ball head force transmission rod to rotate;

[0012] The bottom surface of the slide plate is slidably connected to the top ring surface of the convex ring, and the side end surface of the slide plate facing the ball head force transmission rod is provided with a spherical concave surface;

[0013] The first sealing ring is embedded between the bottom surface of the slide plate and the top annular surface of the convex ring;

[0014] The outer ring surface of the spherical sealing ring is a spherical convex surface, and the inner ring surface is a cylindrical surface. The spherical sealing ring is sleeved on the rod wall of the ball head force transmission rod and is slidably connected thereto, and the outer ring surface of the spherical sealing ring abuts against the spherical concave surface;

[0015] The second sealing ring is embedded between the rod wall of the ball head force transmission rod and the inner wall of the spherical sealing ring;

[0016] The third sealing ring is embedded between the outer wall of the spherical sealing ring and the spherical concave surface.

[0017] The beneficial effect of the above technical solution is that the sealing between the ball head force transfer rod and the cylinder body is achieved through the sealing assembly to prevent leakage of hydraulic oil in the cylinder. At the same time, when the ball head force transfer rod rotates, the slide plate slides along the bottom end face of the cylinder, and the spherical seal rotates around its ball center with the ball head force transfer rod, and can also slide axially along the rod wall of the ball head force transfer rod. Under the action of oil pressure, the contact surfaces among the slide plate, the spherical sealing ring and the top annular surface of the convex ring will be compressed to achieve a sealing effect.

[0018] Preferably, the sealing assembly comprises a ball bowl, a plunger and a support ring;

[0019] A convex ring is fixed to the inner wall of the bottom end of the cylinder body, and the rod end of the ball head force transmission rod can slide out of the inner cavity of the convex ring, and there is a gap between the rod wall and the inner wall of the convex ring to allow the ball head force transmission rod to rotate;

[0020] The ball bowl is sleeved on the ball head end of the ball head force transmission rod and its inner wall surface is in contact with the bottom spherical surface of the ball head end; the plunger is sleeved on the rod end of the ball head force transmission rod, one end of which is fixed to the outer wall of the ball bowl, and the other end extends out of the cylinder body, and the outer wall of the plunger is in sliding contact with the inner wall of the convex ring; the support ring is vertically fixed to the outer wall of the plunger, and its outer wall is slidably connected to the inner wall surface of the cylinder body.

[0021] The beneficial effect of the above technical solution is that the contact surface between the ball head force transmission rod and the ball bowl is a spherical surface, the support ring is supported between the side wall of the plunger and the inner wall of the cylinder, the support ring contacts the inner wall of the cylinder to obtain lateral support, the outer wall of the plunger slides against the inner wall of the convex ring at the bottom end of the cylinder body, the plunger can slide axially with the force transmission rod, and can also seal the bottom end of the cylinder body to prevent oil leakage; at the same time, the hydraulic oil inside the cylinder body can flow through the annular cavity of the support ring.

[0022] Preferably, a first sealing ring is embedded between the side end surface of the support ring and the inner wall of the cylinder body, and between the outer wall of the plunger and the inner wall of the convex ring. Providing the first sealing ring on the contact surface between the sealing assembly and the inner wall of the cylinder body can achieve sealing between the support ring and the plunger and the inner wall of the cylinder body, and can also reduce friction on the contact surface.

[0023] Preferably, a second sealing ring is embedded between the spherical surface of the ball head force transmission rod and the inner wall surface of the ball bowl. The second sealing ring can ensure rotational lubrication and sealing between the ball head and the ball bowl.

[0024] Preferably, the piston is a column piston and its outer wall is in sliding contact with the groove side wall of the notch. A spherical cavity is provided at the top of the piston. The ball end of the ball head force transmission rod is hinged in the spherical cavity, and the rod end passes through the column cavity of the piston. The column piston can directly seal the bottom end of the oil cylinder. On the one hand, the column piston can slide axially along the cylinder body. On the other hand, the outer wall of the column cavity is in sliding contact with the inner wall of the bottom end of the cylinder body to directly seal the notch at the bottom end of the cylinder body, thereby playing the role of a sealing component.

[0025] Preferably, a first sealing ring is embedded between the outer cavity wall of the spherical cavity of the piston and the outer cavity wall of the column cavity and the inner wall of the cylinder body, which can ensure the sealing between the column piston and the inner wall of the cylinder body and reduce the friction between the outer wall of the piston and the inner wall of the cylinder body.

[0026] Preferably, the top end of the cylinder body is detachably connected with an end cover.

[0027] Preferably, the working oil chamber of the cylinder body is connected to the equipment through an oil supply and discharge pipe.

[0028] It can be seen from the above technical solution that compared with the prior art, the utility model discloses a ball joint hydraulic cylinder mechanism, in which the force transmission rod can slide axially and rotate universally along the cylinder, integrating the universal rotation function of the ball joint and the axial telescopic function of the ordinary column cylinder into one cylinder. When necessary, the oil pressure can directly act on the rotating body that realizes the ball joint function, thereby reducing the rotation constraint of the mechanism on the force transmission rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0030] Figure 1 A cross-sectional view of the one-way pressure-bearing structure of the hydraulic cylinder provided by the utility model;

[0031] Figure 2 A cross-sectional view of the bidirectional force-bearing structure of the hydraulic cylinder provided by the utility model;

[0032] Figure 3 for Figure 2 The enlarged schematic diagram of the C part in FIG.

[0033] Figure 4 A cross-sectional view of the hydraulic cylinder in Embodiment 2 provided by the utility model;

[0034] Figure 5 for Figure 4 A magnified schematic diagram of the middle part;

[0035] Figure 6 for Figure 4 The enlarged schematic diagram of the middle B part;

[0036] Figure 7 A one-way tension cross-sectional view of the hydraulic cylinder in Embodiment 2 provided by the utility model;

[0037] Figure 8 A sectional view of a combined hydraulic cylinder provided by the utility model;

[0038] Fig. 9 for Figure 8 One-way tension section view of the hydraulic cylinder;

[0039] Fig.10 for Fig. 9 An enlarged schematic diagram of part D in FIG.

[0040] in,

[0041] 1-cylinder body; 2-end cover; 3-piston; 4-ball head force transmission rod; 5-first sealing ring; 6-sealing assembly; 61-slide plate; 62-first sealing ring; 63-spherical sealing ring; 64-second sealing ring; 65-third sealing ring; 66-plunger; 67-support ring; 68-ball bowl; 7-oil supply and discharge pipes; 8-second sealing ring. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0043] Embodiment 1:

[0044] See attached Figure 2 and 3 The utility model embodiment discloses a ball joint hydraulic cylinder mechanism, including a cylinder body 1, a piston 3, a ball head force transmission rod 4 and a sealing assembly 6;

[0045] A slot is provided at the bottom end of the cylinder body 1, and the piston 3 is arranged in the cylinder body 1 and is slidably connected to the inner wall surface of the cylinder body 1. The ball end of the ball head force transmission rod 4 passes through the slot from bottom to top and is rotatably abutted against the inner wall of the piston 3, and the rod end extends out of the cylinder body 1. There is a gap between the outer wall of the ball head force transmission rod 4 and the groove side wall of the slot to allow the ball head force transmission rod 4 to rotate; the sealing assembly 6 is arranged between the rod wall of the ball head force transmission rod 4 and the inner wall surface of the bottom end of the cylinder body 1 to close the gap.

[0046] In this embodiment, the piston 3 is an annular piston, one side of which is a cylindrical surface and slides against the inner wall of the cylinder body 1 , and the other side is a spherical surface and rotates against the spherical surface of the ball head force transmission rod 4 .

[0047] The piston slides axially along the inner wall of the cylinder, and the ball head of the ball head force transmission rod can make universal rotation along the center of the ball in the piston, so that the force transmission rod can do both axial sliding and universal rotation, integrating the universal rotation function of the ball joint and the axial extension and contraction function of the ordinary column cylinder into one cylinder.

[0048] In some other specific embodiments, the piston may also be used as a seal to achieve sealing between the spherical surface of the ball head force transmission rod and the inner wall surface of the cylinder body.

[0049] In order to further optimize the above technical solution, if required for installation, the annular piston can also be designed into a C shape. After installation, the two ends of the C-shaped ring are pressed against each other to achieve sealing; if required for sealing, it can also be designed as an inlaid composite ring (that is, multiple smaller sealing rings are inlaid on the outside and inside of the main ring body).

[0050] In this embodiment, the sealing assembly 6 includes a slide plate 61, a first sealing ring 62, a spherical sealing ring 63, a second sealing ring 64 and a third sealing ring 65;

[0051] A convex ring is fixed to the inner wall of the bottom end of the cylinder body 1, and the rod end of the ball head force transmission rod 4 can slide out of the inner cavity of the convex ring, and there is a gap between the rod wall and the inner wall of the convex ring to allow the ball head force transmission rod 4 to rotate;

[0052] The bottom surface of the slide plate 61 is slidably connected to the top ring surface of the convex ring, and the side end surface of the slide plate 61 facing the ball head force transmission rod 4 is provided with a spherical concave surface;

[0053] The first sealing ring 62 is embedded between the bottom surface of the slide plate 61 and the top surface of the convex ring;

[0054] The outer ring surface of the spherical sealing ring 63 is a spherical convex surface, and the inner ring surface is a cylindrical surface. The spherical sealing ring 63 is sleeved on the rod wall of the ball head force transmission rod 4 and is slidably connected thereto, and the outer ring surface of the spherical sealing ring 63 abuts against the spherical concave surface;

[0055] The second sealing ring 64 is embedded between the rod wall of the ball head force transmission rod 4 and the inner wall of the spherical sealing ring 63;

[0056] The third sealing ring 65 is embedded between the outer wall of the spherical sealing ring 63 and the spherical concave surface.

[0057] like Figure 3As shown, when the ball head force transfer rod is subjected to bidirectional force or only tensile force, the lower oil chamber of the cylinder needs to be filled with hydraulic oil. At this time, it is necessary to consider the sealing performance between the force transfer rod and the cylinder. At the same time, the universal rotation feature of the force transfer rod must be ensured under the condition of sealing.

[0058] The sealing assembly disclosed in this embodiment has the advantages that when the ball head force transmission rod rotates, the slide plate slides along the bottom end surface of the oil cylinder, and the spherical seal rotates around its sphere center while being able to slide axially along the rod wall of the ball head force transmission rod. Under the action of oil pressure, the contact surfaces among the slide plate, the spherical sealing ring and the top ring surface of the convex ring will be compressed to achieve a sealing effect.

[0059] In some other specific embodiments, the ball head force transmission rod may be subjected to a separate pressure condition, see the attached Figure 1 ;

[0060] When the force transfer rod is under pressure alone, the oil chamber at the bottom of the piston is redundant (the oil chamber is used to provide tension for the force transfer rod). Therefore, the sealing assembly at the bottom end of the cylinder can be eliminated. On the one hand, the annular piston can slide axially along the inner wall of the cylinder body, and on the other hand, it can achieve the sealing between the spherical surface of the ball head force transfer rod and the inner wall of the cylinder body. In this case, the annular piston can be used as a sealing ring, and the ball head of the ball head force transfer rod can be used as the piston of the hydraulic cylinder.

[0061] The ball head can slide along the inner wall of the cylinder and can also rotate, and is sealed by a piston to form a Figure 1 Hydraulic cylinder shown.

[0062] Figure 1 The hydraulic cylinder shown is not only simple in structure and saves materials, but also can greatly reduce the rotation constraint of the ball joint mechanism. The reason why it can reduce the rotation constraint is that the ball head of the ball head force transmission rod is both a rotating body and a piston. Most of the force-bearing surface of the ball head is in direct contact with the hydraulic oil, and there is almost no friction between the hydraulic oil and the ball head. The only rotation constraint comes from the friction between the annular piston 3 and the ball head force transmission rod 4.

[0063] In order to further optimize the above technical solution and facilitate the installation, removal and maintenance of the ball joint hydraulic mechanism, the top end of the cylinder body 1 is detachably connected with an end cover 2.

[0064] In order to further optimize the above technical solution and facilitate the use of the ball joint hydraulic mechanism, the working oil chamber of the cylinder body 1 is connected to the equipment through the oil supply and discharge pipe 7.

[0065] Embodiment 2:

[0066] See attached Figure 8 The utility model embodiment discloses a ball joint hydraulic cylinder mechanism, which is different from the embodiment 1. Figure 2The hydraulic cylinder mechanism has the same functional principle, the difference is the composition of the sealing component;

[0067] In this embodiment, the sealing assembly 6 includes a ball bowl 68, a plunger 66 and a support ring 67;

[0068] A convex ring is fixed to the inner wall of the bottom end of the cylinder body 1, and the rod end of the ball head force transmission rod 4 can slide out of the inner cavity of the convex ring, and there is a gap between the rod wall and the inner wall of the convex ring to allow the ball head force transmission rod 4 to rotate;

[0069] The ball bowl 68 is sleeved on the ball head end of the ball head force transmission rod 4 and its inner wall surface is in contact with the bottom spherical surface of the ball head end; the plunger 66 is sleeved on the rod end of the ball head force transmission rod 4, one end of which is fixed to the outer wall of the ball bowl 68, and the other end extends out of the cylinder body 1, and the outer wall of the plunger 66 is in sliding contact with the inner wall of the convex ring; the support ring 67 is vertically fixed on the outer wall of the plunger 66, and its outer wall is slidably connected to the inner wall surface of the cylinder body 1.

[0070] In order to further optimize the above technical solution and reduce the friction between the sealing assembly and the inner wall of the cylinder body, a first sealing ring 5 is embedded between the side end surface of the support ring 67 and the inner wall of the cylinder body 1, and between the outer wall of the plunger 66 and the inner wall of the convex ring.

[0071] In order to further optimize the above technical solution and reduce the friction between the ball head of the ball head force transmission rod and the ball bowl, a second sealing ring 8 is embedded between the spherical surface of the ball head force transmission rod 4 and the inner wall surface of the ball bowl 68.

[0072] Figure 8 The contact surface between the ball bowl and the ball head of the ball head force transmission rod is a spherical surface. In order to ensure the rotation performance and sealing of the ball joint, a second sealing ring is embedded between the spherical surface and the inner wall of the ball bowl;

[0073] The support ring is supported between the piston side wall and the inner wall of the oil cylinder, so that the support ring contacts the inner wall of the oil cylinder to obtain lateral support, and a first sealing ring is provided to reduce the friction of the support surface.

[0074] In order to allow the oil pressure to act directly on the ball head to reduce the embedding torque, the annular cavity of the support ring serves as a circulation channel for the hydraulic oil; in addition, the ball bowl and the ball head force transfer rod must always maintain close contact (this is necessary to ensure reliable sealing), and the overall structure composed of the plunger and the ball bowl must move up synchronously when the ball head force transfer rod moves upward. In order to achieve this, the spherical surface where the ball bowl contacts the ball head force transfer rod can be designed to be trumpet-shaped, so that the oil pressure acting on the bell mouth can generate an upward force. When the ball head force transfer rod moves upward, the combined force of the oil pressure in the bell mouth range will drive the plunger and the ball head force transfer rod to move upward synchronously; the support ring only serves as a rotation constraint; when the contact surface between the plunger and the cylinder end hole and the upper bell mouth and the ball head force transfer rod can obtain sufficient anti-rotation constraint, the support ring can be cancelled (at this time, the sealing assembly becomes a simpler cylindrical structure with a bell mouth at the upper end).

[0075] Fig. 9 and Fig.10 The structure and Figure 8 The structure is similar to that of the conventional piston, except that the sealing assembly is combined with the annular piston to form an integral piston. This structure is suitable for situations where the force transmission rod only bears tensile force.

[0076] Embodiment 3:

[0077] See attached Figures 4 to 6 The utility model embodiment discloses a ball joint hydraulic cylinder mechanism, which is different from the embodiment 1 in that the sealing component is cancelled and the annular piston is changed into a column piston.

[0078] The outer wall of the column piston is in sliding contact with the inner wall of the oil cylinder and the groove side wall of the notch. A spherical cavity is provided at the top of the piston 3. The ball head end of the ball head force transmission rod 4 is hinged in the spherical cavity, and the rod end passes through the column cavity of the piston 3.

[0079] In this embodiment, the ball head of the ball head force transmission rod is embedded in the spherical cavity of the piston, and the rod end can perform universal rotation around the center of the ball head within a certain range. At the same time, the force transmission rod can slide axially along the cylinder body with the piston, integrating the universal rotation function of the ball joint and the axial extension function of the ordinary column cylinder into one cylinder.

[0080] In order to further optimize the above technical solution and ensure that the cylinder body does not leak oil, there is sufficient sealing performance between the outer wall of the piston and the inner wall of the cylinder, and a first sealing ring 5 is embedded between the outer wall of the piston 3 and the inner wall of the cylinder body 1.

[0081] In this embodiment, the ball head of the ball head force transmission rod can perform universal rotation in the piston, the ball head force transmission rod and the piston form a ball joint structure, and the ball head force transmission rod can perform axial displacement with the sliding of the column piston.

[0082] like Figure 4 As shown, a spherical cavity is formed at the top of the piston, and the outer spherical surface of the spherical cavity abuts against the inner wall of the cylinder body. The bottom end of the piston is a hollow cylinder, and a convex ring is fixed to the inner wall of the opening at the bottom end of the cylinder body. The cylindrical part of the bottom of the piston passes through the annular cavity of the convex ring, and its cylindrical outer wall abuts against the inner wall of the convex ring. The ball head force transmission rod is divided into a ball head and a force transmission rod. The ball head is hinged in the spherical cavity, and the force transmission rod passes through the cavity of the cylindrical part of the piston. The ball head force transmission rod and the piston form a ball joint structure.

[0083] In order to further optimize the above technical solution and improve the convenience of installation of the ball head force transmission rod, the piston can be cut into an upper spherical part and a lower ball-cylindrical part along the center of its spherical cavity. During installation, the rod end of the ball head force transmission rod is first passed through the cavity in the lower half of the piston from top to bottom, and then the upper hemispherical part of the piston is covered. The upper and lower parts of the piston can be fastened by bolts.

[0084] like Figure 7As shown, when the ball head transmission rod of the ball joint hydraulic cylinder mechanism provided by this embodiment is under the condition of single tension, the oil chamber of the oil cylinder above the piston does not work, and the ball joint does not transmit pressure. Therefore, it is only necessary to fill the lower half of the oil cylinder with hydraulic oil, and the upper part of the ball head of the piston and the ball head transmission rod is cut off to form Figure 7 structure, so that the structure can be optimized when the force transmission rod of the ball joint hydraulic cylinder mechanism is subjected to tension alone.

[0085] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0086] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A ball joint hydraulic cylinder mechanism, characterized in that: It comprises a cylinder body (1), a piston (3), a ball head force transmission rod (4) and a sealing assembly (6); A notch is provided at the bottom end of the cylinder body (1); the piston (3) is arranged in the cylinder body (1) and is slidably connected to the inner wall surface thereof; the ball end of the ball head force transmission rod (4) passes through the notch from bottom to top and is rotatably abutted against the inner wall of the piston (3); the rod end extends out of the cylinder body (1); and a gap is provided between the outer wall of the ball head force transmission rod (4) and the groove side wall of the notch to allow the ball head force transmission rod (4) to rotate; the sealing assembly (6) is provided between the rod wall of the ball head force transmission rod (4) and the inner wall surface of the bottom end of the cylinder body (1) to close the gap.

2. A ball joint hydraulic cylinder mechanism according to claim 1, characterized in that: The piston (3) is an annular piston, one side of which is a cylindrical surface and is in sliding contact with the inner wall of the cylinder body (1), and the other side of which is a spherical surface and is in rotational contact with the spherical surface of the ball head force transmission rod (4).

3. A ball joint hydraulic cylinder mechanism according to claim 2, characterized in that: The sealing assembly (6) comprises a slide plate (61), a first sealing ring (62), a spherical sealing ring (63), a second sealing ring (64) and a third sealing ring (65); A convex ring is fixed to the inner wall of the bottom end of the cylinder body (1), and the rod end of the ball head force transmission rod (4) can slide out of the inner cavity of the convex ring, and there is a gap between the rod wall and the inner wall of the convex ring to allow the ball head force transmission rod (4) to rotate; The bottom surface of the slide plate (61) is slidably connected to the top ring surface of the convex ring, and the side end surface of the slide plate (61) facing the ball head force transmission rod (4) is provided with a spherical concave surface; The first sealing ring (62) is embedded between the bottom surface of the slide plate (61) and the top annular surface of the convex ring; The outer ring surface of the spherical sealing ring (63) is a spherical convex surface, and the inner ring surface is a cylindrical surface. The spherical sealing ring (63) is sleeved on the rod wall of the ball head force transmission rod (4) and is slidably connected thereto, and the outer ring surface of the spherical sealing ring (63) abuts against the spherical concave surface. The second sealing ring (64) is embedded between the rod wall of the ball head force transmission rod (4) and the inner wall of the spherical sealing ring (63); The third sealing ring (65) is embedded between the outer wall of the spherical sealing ring (63) and the spherical concave surface.

4. A ball joint hydraulic cylinder mechanism according to claim 2, characterized in that: The sealing assembly (6) comprises a ball bowl (68), a plunger (66) and a support ring (67); A convex ring is fixed to the inner wall of the bottom end of the cylinder body (1), and the rod end of the ball head force transmission rod (4) can slide out of the inner cavity of the convex ring, and there is a gap between the rod wall and the inner wall of the convex ring to allow the ball head force transmission rod (4) to rotate; The ball bowl (68) is sleeved on the ball head end of the ball head force transmission rod (4) and its inner wall surface is in contact with the bottom spherical surface of the ball head end; the plunger (66) is sleeved on the rod end of the ball head force transmission rod (4), one end of which is fixed to the outer wall of the ball bowl (68) and the other end extends out of the cylinder body (1), and the outer wall of the plunger (66) is in sliding contact with the inner wall of the convex ring; the support ring (67) is vertically fixed to the outer wall of the plunger (66), and its outer wall is in sliding connection with the inner wall surface of the cylinder body (1).

5. A ball joint hydraulic cylinder mechanism according to claim 4, characterized in that: A first sealing ring (5) is embedded between the side end surface of the support ring (67) and the inner wall of the cylinder body (1), and between the outer wall of the plunger (66) and the inner wall of the convex ring.

6. A ball joint hydraulic cylinder mechanism according to claim 5, characterized in that: A second sealing ring (8) is embedded between the spherical surface of the ball head force transmission rod (4) and the inner wall surface of the ball bowl (68).

7. The ball joint hydraulic cylinder mechanism according to claim 1, characterized in that: The piston (3) is a columnar piston and its outer wall is in sliding contact with the groove side wall of the notch. A spherical cavity is provided at the top of the piston (3). The ball head end of the ball head force transmission rod (4) is hinged in the spherical cavity, and the rod end passes through the column cavity of the piston (3).

8. A ball joint hydraulic cylinder mechanism according to claim 7, characterized in that: A first sealing ring (5) is embedded between the outer cavity wall of the spherical cavity of the piston (3) and the outer cavity wall of the column cavity thereof and the inner wall of the cylinder body (1).

9. The ball joint hydraulic cylinder mechanism according to claim 1, characterized in that: The top end of the cylinder body (1) is detachably connected to an end cover (2).

10. The ball joint hydraulic cylinder mechanism according to claim 1, characterized in that: The working oil chamber of the cylinder body (1) is connected to the equipment via an oil supply and discharge pipe (7).

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