Integrated hydraulic cylinder to eliminate ball joint clearance

Abstract

The present invention belongs to the technical field of hydraulic cylinder equipment, and relates to an integrated hydraulic cylinder for eliminating ball joint clearance. The hydraulic cylinder reciprocates under high-frequency and high-load conditions, and has the characteristics of large output power and small amplitude. Therefore, the hydraulic cylinder assembly precision is required to be high, especially the ball joint connection part needs to be controlled according to "zero clearance", so as to avoid the hydraulic cylinder operation process from moving, creeping and other problems that seriously affect the cylinder performance. In order to solve the above problems, the integrated hydraulic cylinder for eliminating ball joint clearance of the present invention includes a hydraulic cylinder, a ball joint ball head, a ball joint centering mechanism, and a ball joint clamping mechanism. The hydraulic cylinder is in the middle position, and the ball joint ball heads are connected at both ends. The ball joint centering mechanism is located in a position close to the ball joint ball head, and is composed of an upper hemisphere shell and a lower hemisphere shell. By matching the inner surface of the ball shell with the outer surface of the ball joint ball head, it is ensured that the ball joint ball head is concentric with the ball joint, which plays a centering role; the ball joint clamping mechanism is outside the ball joint centering mechanism to eliminate the gap inside the ball joint.

Description

Technical Field

[0001] The invention belongs to the technical field of hydraulic cylinder equipment, and in particular relates to a ball-joint integrated hydraulic cylinder which is easy to disassemble, maintain and replace and can eliminate ball-joint clearance. Background Art

[0002] The hydraulic cylinder performs telescopic movement under high-frequency and high-load conditions, and has the characteristics of large output power and small amplitude. Therefore, the hydraulic cylinder assembly requires high precision, especially the ball joint connection part needs to be controlled according to "zero gap". If there is a gap in the ball joint connection part, it will directly lead to discontinuous working stroke of the hydraulic cylinder and serious creeping phenomenon. Therefore, the ball joint connection structure in the ball joint integrated hydraulic cylinder needs to reach the "zero gap" state. Summary of the invention

[0003] The purpose of the present invention is to solve the technical problem that there is a gap inside the ball joint structure of the existing ball joint integrated hydraulic cylinder, which causes the hydraulic cylinder connected to the ball joint to move and creep, and to provide a ball joint integrated hydraulic cylinder with ball joints at both ends that can eliminate the gap.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: an integrated hydraulic cylinder for eliminating ball joint gap, comprising a hydraulic cylinder, two ball joint ball heads connected at both ends of the hydraulic cylinder; and also comprising a ball joint centering mechanism and a ball joint clamping mechanism matched with each ball joint ball head; the ball joint centering mechanism is composed of an upper hemispherical shell and a lower hemispherical shell, the upper hemispherical shell is a cylindrical structure penetrating from front to back, and the lower hemispherical shell is a convex-shaped cylindrical structure penetrating from front to back; the inner surfaces of the upper hemispherical shell and the lower hemispherical shell are matched with the outer surface of the ball head, and after the ball head is assembled to the upper hemispherical shell and the lower hemispherical shell, an adjustable gap is left between the opposite end faces of the upper hemispherical shell and the lower hemispherical shell;

[0005] The ball joint clamping mechanism consists of a ball joint seat and a ball joint cover plate. The ball joint seat is convex in shape with a through hole in the center. A boss structure for installing the upper hemispherical shell is arranged in the through hole, and a limiting step for limiting the ball joint cover plate is arranged on the top of the convex shape; a through hole is arranged in the center of the ball joint cover plate, and the through hole matches with the convex cylindrical structure of the lower hemispherical shell; a plurality of screw holes are evenly distributed circumferentially around the central axis on the ball joint cover plate and the ball joint seat, and the screw holes on the ball joint cover plate and the ball joint seat correspond to each other one by one; after the ball head is installed in the ball joint centering mechanism, the upper hemispherical shell of the ball joint centering mechanism is installed in the ball joint seat, and the lower hemispherical shell is installed in the ball joint cover plate, one end of the ball joint cover plate is stuck in the limiting step of the ball joint seat, and the bolt connects the ball joint cover plate and the ball joint seat, and an adjustable gap is left between the end face of one end of the ball joint cover plate and the end face of the ball joint seat with the limiting step.

[0006] The hydraulic cylinder is in the middle, with the ball joint heads connected at both ends. The ball joint centering mechanism is close to the ball joint head, and its function is to ensure that the ball joint head is concentric with the ball joint; the ball joint clamping mechanism is outside the ball joint centering mechanism, and its function is to eliminate the gap inside the ball joint. The ball joint centering mechanism consists of an upper hemisphere shell and a lower hemisphere shell. By matching the inner surface of the spherical shell with the outer surface of the ball head, the ball joint head can complete the centering function inside the ball joint.

[0007] During processing, an adjustable gap is left between the upper hemispherical shell and the lower hemispherical shell, and an adjustable gap is left between the ball joint cover plate and the ball joint seat. The lower hemispherical shell and the ball joint cover plate are in contact with each other by means of a boss connection (the boss structure inside the ball joint cover plate and the boss shape of the lower hemispherical shell), and the upper hemispherical shell and the ball joint seat are also in contact with each other by means of a boss connection (i.e., the boss structure inside the ball joint seat). Through the screw connection between the ball joint cover plate and the ball joint seat, a small interference is generated between the ball head and the upper and lower hemispherical shells, ensuring that there is no gap between the internal structures of the ball joint. The gap between the ball joint cover plate and the ball joint seat is smaller than the gap between the upper ball half shell and the lower hemispherical shell, in order to facilitate assembly and clamping.

[0008] The external installation and fixation of the ball joint seat is fixed by screws in the mounting holes on the ball joint seat. After the centering mechanism and the clamping mechanism are assembled with the ball head, they can be disassembled and the clearance can be adjusted.

[0009] Compared with the prior art, the present invention has the following beneficial effects:

[0010] 1. The ball joint structure provided in the present invention can well ensure that there is no gap between the internal structures of the ball joint, and the ball head will not move inside the ball joint due to external force.

[0011] 2. The ball joint structure provided in the present invention can adjust the bolt preload according to the needs of the ball joint, thereby changing the size of the interference fit inside the ball joint. It has strong operational flexibility and can also make a trade-off between the flexibility and wear of the ball joint according to needs.

[0012] 3. The bolt connection adopted in the present invention is easy to disassemble and assemble, and easy to maintain and replace. For example, when the ball joint is worn, only the worn parts need to be replaced without replacing the entire ball joint, thereby reducing equipment costs and achieving the goals of economy and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0014] Figure 2 It is a schematic diagram of the overall structure of the ball joint of the present invention;

[0015] Figure 3 It is a cross-sectional schematic diagram of the ball joint centering mechanism of the present invention;

[0016] Figure 4 It is a cross-sectional schematic diagram of the ball joint clamping mechanism of the present invention.

[0017] 1- hydraulic cylinder, 2- ball joint ball head, 3- ball joint centering mechanism, 4- ball joint clamping mechanism;

[0018] 5-ball joint seat, 6-ball joint cover plate, 7-upper hemispherical shell, 8-lower hemispherical shell, 9-ball head, 10-bolt, 11-mounting hole. DETAILED DESCRIPTION

[0019] Example 1

[0020] An integrated hydraulic cylinder for eliminating ball joint clearance comprises a hydraulic cylinder 1, two ball joint heads 2 (including a ball head 9 and a part connected to the hydraulic cylinder) connected at both ends of the hydraulic cylinder 1; and a ball joint centering mechanism 3 and a ball joint clamping mechanism 4 matched with each ball joint head 2; the ball joint centering mechanism 3 is composed of an upper hemispherical shell 7 and a lower hemispherical shell 8, the upper hemispherical shell 7 is a cylindrical structure that passes through front and back, and the lower hemispherical shell 8 is a convex cylindrical structure that passes through front and back; the inner surfaces of the upper hemispherical shell 7 and the lower hemispherical shell 8 are structures that match the outer surface of the ball head 9, and after the ball head 9 is assembled into the upper hemispherical shell 7 and the lower hemispherical shell 8, an adjustable gap is left between the opposite end surfaces of the upper hemispherical shell 7 and the lower hemispherical shell 8;

[0021] The ball joint clamping mechanism 4 is composed of a ball joint cover plate 6 and a ball joint seat 5. The ball joint seat 5 is convex in shape and has a through hole in the center. A boss structure for mounting the upper hemispherical shell 7 is arranged in the through hole. The top of the convex shape is a limiting step for limiting the ball joint cover plate 6. A through hole is opened in the center of the ball joint cover plate 6 and the through hole is matched with the convex cylindrical structure of the lower hemispherical shell 8. The ball joint cover plate 6 and the ball joint seat 5 are evenly distributed with a plurality of screw holes around their central axis. The screw holes on the hinge seat 5 correspond to each other; after the ball head 9 is installed in the ball joint centering mechanism 3, the upper hemispherical shell 7 of the ball joint centering mechanism 3 is installed in the ball joint seat 5, and the lower hemispherical shell 8 is installed in the ball joint cover plate 6. One end of the ball joint cover plate 6 is stuck in the limit step of the ball joint seat 5. The bolt 10 passes through the screw holes on the ball joint cover plate 6 and the ball joint seat 5 to connect the ball joint cover plate 6 and the ball joint seat 5. An adjustable gap is left between the end face of one end of the ball joint cover plate 6 and the end face of the ball joint seat 5 with the limit step. The gap between the ball joint cover plate 6 and the ball joint seat 5 is smaller than the gap between the upper ball half shell 7 and the lower hemispherical shell 8, in order to facilitate assembly and clamping. By adjusting the preload of the bolt 10, the gap between the ball joint cover plate 6 and the ball joint seat 5 is adjusted, and then the gap between the upper hemispherical shell 7 and the lower hemispherical shell 8 is adjusted, so that a micro interference is generated between the upper hemispherical shell 7, the lower hemispherical shell 8 and the ball head 9 to achieve the requirement of "zero gap".

[0022] Example 2

[0023] The lower hemispherical shell 8 is integrally machined and then cut into two identical halves in the radial direction, and finally butt-jointed and assembled along the radial direction of the ball head 9.

[0024] Example 3

[0025] The ball joint seat 5 is also evenly distributed with multiple mounting holes 11 around its central axis. The mounting holes 11 are radially located outside the screw holes and are used to connect and position the ball joint clamping mechanism with a machining center or other device. The function of the mounting holes 11 is to fix the ball joint seat to an external mechanism through bolts.

[0026] The present invention will be further described below in conjunction with the accompanying drawings and examples.

[0027] like Figure 1 As shown, this ball joint integrated hydraulic cylinder includes a hydraulic cylinder 1, a ball joint ball head 2, a ball joint centering mechanism 3, and a ball joint clamping mechanism 4. The hydraulic cylinder 1 is in the middle position, and the two ends are connected to the ball joint. This ball joint is divided into three parts: the ball joint ball head 2, the ball joint centering mechanism 3, and the ball joint clamping mechanism 4. The ball joint centering mechanism 3 is located close to the ball joint ball head 2, and its function is to ensure that the center line of the ball joint ball head falls on the center line of the ball joint as a whole; the ball joint clamping mechanism 4 is outside the ball joint centering mechanism 3, and its function is to eliminate the gap inside the ball joint.

[0028] Figure 2 The gapless ball joints at both ends of the hydraulic cylinder ( Figure 1 The left side part), the main parts include a ball joint seat 5, a ball joint cover plate 6, an upper hemispherical shell 7, a lower hemispherical shell 8, a ball head 9, and a bolt 10.

[0029] Figure 3 It is the centering mechanism of the ball joint, which is mainly composed of an upper hemispherical shell 7, a lower hemispherical shell 8 and a ball head 9. The inner surface of the upper hemispherical shell 7 and the inner surface of the lower hemispherical shell 8 and the outer surface of the ball head 9 cooperate with each other to achieve the purpose of the center line of the ball head 9 falling on the center line of the whole ball joint. If the lower hemispherical shell 8 cannot be installed from the right axial direction, it is necessary to cut the lower hemispherical shell 8 into two halves and install it from the radial direction of the ball head 9.

[0030] Figure 4 It is a clamping mechanism of the ball joint, mainly composed of a ball joint cover plate 6 and a ball joint seat 5. During processing, since an adjustable gap is left between the upper hemispherical shell 7 and the lower hemispherical shell 8, an adjustable gap is left between the ball joint cover plate 6 and the ball joint seat 5. Through the screw 10 between the ball joint cover plate 6 and the ball joint seat 5, a small interference is generated between the ball head 9 and the upper hemispherical shell 7 and the lower hemispherical shell 8, ensuring that there is no gap between the internal structure of the ball joint. The ball joint seat 5 is also evenly distributed with multiple mounting holes 11 around its central axis.

[0031] Working process of the present invention

[0032] 1. Centering mechanism

[0033] The ball joint parts at both ends of the ball joint integrated hydraulic cylinder need to ensure that the inner surface of the upper hemispherical shell and the inner surface of the lower hemispherical shell of the ball joint match the outer surface of the ball head to achieve the purpose of the center line of the ball head falling on the center line of the ball joint as a whole.

[0034] 2. Clamping mechanism

[0035] The ball joint parts at both ends of the ball joint integrated hydraulic cylinder, where the upper hemisphere shell of the ball joint is placed on the ball joint seat, and the lower hemisphere shell is placed on the ball joint cover plate, and the bolts between the ball joint seat and the ball joint cover plate are used to create a slight interference fit between the upper hemisphere shell, the lower hemisphere shell and the ball head, ensuring that the ball head will not shake or be eccentric inside the ball joint, thereby preventing the ball joint integrated hydraulic cylinder from moving or creeping during reciprocating motion.

Claims

1. An integrated hydraulic cylinder for eliminating ball joint clearance, comprising a hydraulic cylinder (1) and two ball joint ball heads (2) connected at both ends of the hydraulic cylinder (1); characterized in that: It also includes a ball joint centering mechanism (3) and a ball joint clamping mechanism (4) matched with each ball joint ball head (2); the ball joint centering mechanism (3) is composed of an upper hemispherical shell (7) and a lower hemispherical shell (8); the upper hemispherical shell (7) is a cylindrical structure that passes through from front to back, and the lower hemispherical shell (8) is a convex-shaped cylindrical structure that passes through from front to back; the inner surfaces of the upper hemispherical shell (7) and the lower hemispherical shell (8) are matched with the outer surface of the ball head (9); after the ball head (9) is assembled to the upper hemispherical shell (7) and the lower hemispherical shell (8), an adjustable gap is left between the opposite end surfaces of the upper hemispherical shell (7) and the lower hemispherical shell (8); The ball joint clamping mechanism (4) is composed of a ball joint seat (5) and a ball joint cover plate (6). The ball joint seat (5) is convex in shape and has a through hole in the center. A boss structure for mounting the upper hemispherical shell (7) is arranged in the through hole. A limiting step for limiting the ball joint cover plate (6) is arranged at the top of the convex shape. The ball joint cover plate (6) has a through hole in the center and the through hole matches the convex cylindrical structure of the lower hemispherical shell (8). The ball joint cover plate (6) and the ball joint seat (5) are circumferentially evenly distributed with a plurality of screw holes around their central axis. The ball joint cover plate (6) is provided with a plurality of screw holes. ) and the screw holes on the ball joint seat (5) correspond one to one; after the ball head (9) is installed in the ball joint centering mechanism (3), the upper hemispherical shell (7) of the ball joint centering mechanism (3) is installed in the ball joint seat (5), and the lower hemispherical shell (8) is installed in the ball joint cover plate (6), one end of the ball joint cover plate (6) is stuck in the limit step of the ball joint seat (5), and the bolt (10) connects the ball joint cover plate (6) and the ball joint seat (5), and an adjustable gap is left between the end surface of one end of the ball joint cover plate (6) and the end surface of the ball joint seat (5) with the limit step.

2. The integrated hydraulic cylinder for eliminating ball joint clearance according to claim 1, characterized in that: By adjusting the pre-tightening force of the bolt (10), the gap between the ball joint cover plate (6) and the ball joint seat (5) is adjusted, and the gap between the upper hemispherical shell (7) and the lower hemispherical shell (8) is further adjusted, so that a micro interference is generated between the upper hemispherical shell (7), the lower hemispherical shell (8) and the ball head (9) to achieve the requirement of "zero gap".

3. The integrated hydraulic cylinder for eliminating ball joint clearance as claimed in claim 2, characterized in that: The gap between the ball joint cover plate (6) and the ball joint seat (5) is smaller than the gap between the upper hemispherical shell (7) and the lower hemispherical shell (8), which facilitates assembly and clamping.

4. The integrated hydraulic cylinder for eliminating ball joint clearance according to any one of claims 1 to 3, characterized in that: After the lower hemispherical shell (8) is processed as a whole, it is cut into two identical halves along the radial direction, and finally the halves are butt-jointed and assembled along the radial direction of the ball head (9).

5. The integrated hydraulic cylinder for eliminating ball joint clearance according to any one of claims 1 to 3, characterized in that: The ball joint seat (5) is also provided with a plurality of mounting holes (11) evenly distributed around its central axis, wherein the mounting holes (11) are radially located outside the screw holes.

6. The integrated hydraulic cylinder for eliminating ball joint clearance according to any one of claims 1 to 3, characterized in that: The ball joint seat (5) and the ball joint cover plate (6) are connected by bolts (10), which is convenient for subsequent disassembly, maintenance and replacement of parts.

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