Clamping mechanism used in cooperation with hydraulic wrist

Abstract

The utility model discloses a clamping mechanism matched with a hydraulic wrist for use, which relates to the technical field of excavator accessories and comprises a connecting frame, a front connecting shaft and a rear connecting shaft are respectively arranged at the front end and the rear end of the connecting frame, a first clamping arm and a second clamping arm are hinged to one end of the connecting frame, and a driving cylinder is hinged to the other end of the connecting frame; a connecting rod is hinged between one end, close to the connecting frame, of the first clamping arm and one end, close to the connecting frame, of the second clamping arm, and the driving cylinder controls the first clamping arm and the second clamping arm to do synchronous and opposite arc motion under the cooperation of the connecting rod. The synchronous linkage of the first clamping arm and the second clamping arm is realized under the driving of the driving cylinder, so that the stress of the first clamping arm and the second clamping arm is more uniform, and the interlocking braking of the first clamping arm and the second clamping arm is realized by utilizing the connecting rod.

Description

Technical Field

[0001] The utility model relates to the technical field of excavator attachments, in particular to a clamping mechanism for cooperating with a hydraulic wrist. Background Technique

[0002] The earliest excavators were mechanical equipment that could only perform one-way operations. When restricted by the working range or when more complex working conditions needed to be carried out, the whole machine's working position needed to be continuously adjusted for operation, and the use effect might not be achieved, thus restricting the exertion of more functions of the excavator, reducing labor productivity and increasing operation costs. Therefore, the universal connector, commonly known as the hydraulic wrist, came in very handy. It is installed between the boom and the bucket of the excavator, uses the telescopic cylinder to achieve the angle swing function, and at the same time uses the worm and worm gear transmission to achieve 360° rotation.

[0003] The utility model patent with the publication number of CN 217267749 U and the publication date of August 23, 2022, discloses an excavator bucket angle adjustment device, including a swing angle cylinder, a first platform, a second platform, a power mechanism, an electric control distribution valve, a hydraulic distribution valve, a central pipeline, a bearing type slewing support and a third platform. The first platform is symmetrically provided with first swing angle cylinder seat blocks on both sides. The swing angle cylinder is rotationally connected to the first swing angle cylinder seat blocks through a rotating shaft. The lower ends of both sides of the first platform are symmetrically provided with lifting lugs. The upper ends of the second platform are symmetrically provided with lifting plates. The upper ends of the lifting plates are rotationally connected to the lifting lugs through a connecting shaft. The power mechanism is arranged at the upper end of the second platform. The electric control distribution valve and the hydraulic distribution valve are both arranged on the second platform. The second platform is symmetrically provided with second swing angle cylinder seat blocks on both sides. The lower end of the swing angle cylinder is rotationally connected to the second swing angle cylinder seat blocks through a rotating shaft. The central pipeline is arranged in the middle of the upper end of the second platform. The bearing type slewing support is arranged in the middle of the lower end of the second platform. The bearing type slewing support cooperates with the power mechanism.

[0004] This patent integrates a clamp hydraulic quick connector and a swing angle system, enabling the excavator driver to complete the forward and reverse shoveling of the bucket device and freely adjust it by 360 degrees without getting off the vehicle. When encountering dead corners that the excavator cannot reach, the swing angle and rotation system can be coordinated to operate on the dead corners. The rotation mechanism, swing angle adjustment mechanism, and clamp are integrally designed, and a quick connector hydraulic cylinder is provided to achieve the purpose of quickly replacing other working devices of the excavator. It is equipped with a safety lock spring that can be automatically locked, allowing the excavator to quickly replace buckets, breaker hammers, and other working devices with different widths without the driver getting off the vehicle. Even when the hydraulic device of the quick connector fails, the working device will not fall off. Through the automatic locking of the safety lock spring, the purpose of safely and quickly replacing attachments can be achieved, ensuring that the working device does not fall off even when the hydraulic device of the quick connector fails. The hydraulic clamp and hydraulic quick change are designed with inclination adjustment, integrating the specialties of various auxiliary tools. Through a compact design, the purpose of equipping both a bucket and a clamp as two operating tools can be achieved simultaneously;

[0005] However, there is also a very obvious problem in this patent: that is, two swing angle cylinders are used to control the actions of the clamp hooks respectively, and when the clamp hooks act, they act independently, and there is no linkage between the two clamp hooks. This will cause problems such as inconsistent actions and uneven forces of the two clamp hooks during operation. For example, one hook moves while the other does not, or the opening and closing angles are inconsistent, resulting in the overall deviation of the two clamp hooks. At the same time, when one of the cylinders gets out of control, the two clamp hooks cannot complete the purpose of clamping the workpiece, and there is even a safety hazard of falling during operation.

[0006] Therefore, there is an urgent need for a clamping mechanism for cooperating with a hydraulic wrist to achieve uniform force on the two clamping arms and the purpose of synchronous linkage. Utility Model Content

[0007] In view of the above technical problems, the present utility model provides a clamping mechanism for cooperating with a hydraulic wrist to solve the problem that the existing clamping arms act independently, resulting in uneven force and inability to achieve synchronous linkage.

[0008] The above technical objectives of the present utility model are achieved through the following technical solutions:

[0009] A clamping mechanism for cooperating with a hydraulic wrist includes a connecting frame. The front and rear ends of the connecting frame are respectively provided with a front connecting shaft and a rear connecting shaft. One end of the connecting frame is hinged with a first clamping arm and a second clamping arm, and the other end of the connecting frame is hinged with a driving cylinder;

[0010] A connecting rod is hinged between the first clamping arm and the second clamping arm near the connecting frame. The driving cylinder controls the first clamping arm and the second clamping arm to perform synchronous circular arc movements in cooperation with the connecting rod.

[0011] Further, the number of the driving cylinders is two, and they are respectively arranged on both sides of the connecting frame. The output ends of the two driving cylinders are respectively hinged to the corresponding first clamping arm and the second clamping arm.

[0012] Further, the first clamping arm includes a connecting body. First clamping pieces and second clamping pieces are respectively arranged on both sides of the connecting body. An accommodating opening is formed between the first clamping piece and the second clamping piece, and the width of the accommodating opening is greater than the thickness of the second clamping arm.

[0013] Further, at one end of the first clamping arm close to the connecting frame and at the vertex position of a virtual triangle, a first hinge hole, a second hinge hole and a third hinge hole are respectively penetrated. The first hinge hole is matched with the output end of the corresponding driving cylinder, the second hinge hole is rotatably connected with the connecting frame, and the third hinge hole is hinged to one end of the connecting rod.

[0014] Further, reinforcing ribs are arranged on the sides of the first clamping piece and the second clamping piece away from the accommodating opening.

[0015] Further, the connecting frame is integrally U-shaped and includes two symmetric connecting arms. A connecting beam is arranged between one ends of the two connecting arms. The first clamping arm and the second clamping arm are both rotatably connected with the connecting beam. At one end of the second clamping arm close to the connecting frame and at the vertex position of a virtual triangle, a fourth hinge hole, a fifth hinge hole and a sixth hinge hole are respectively penetrated. The fourth hinge hole is matched with the output end of the corresponding driving cylinder, the fifth hinge hole is rotatably connected with the connecting frame, and the sixth hinge hole is hinged to the other end of the connecting rod. The connecting arms can be accommodated in the first clamping arm when closed.

[0016] In summary, the beneficial technical effects of the present utility model are as follows:

[0017] (1) The driving cylinder is used to provide the power for the opening and closing of the first clamping arm and the second clamping arm. When the first clamping arm and the second clamping arm open and close, the synchronous linkage of the first clamping arm and the second clamping arm is realized through the connecting rod, avoiding the independent movement of the first clamping arm and the second clamping arm, preventing the problem of uneven force during operation, and at the same time, when one of the driving cylinders loses power, the connecting rod can be used to mutually brake the first clamping arm and the second clamping arm, avoiding the dropping of the workpiece and improving the safety of the entire mechanism.

[0018] (2) The use of double driving cylinders increases the power of the first clamping arm and the second clamping arm, making the clamping force on the workpiece more sufficient.

[0019] (3) By using the accommodating opening, the second clamping arm can be accommodated in the first clamping arm, reducing the width of the entire mechanism after the first clamping arm and the second clamping arm are closed, and avoiding interference during operation in a limited space. Description of the Drawings

[0020] Figure 1 is the overall structural schematic diagram of the present utility model;

[0021] Figure 2 is Figure 1 the schematic diagram with the connecting frame hidden;

[0022] Figure 3 is Figure 2 the schematic diagram from another angle;

[0023] Figure 4 is the structural schematic diagram of the first clamping arm;

[0024] Figure 5 is Figure 4 the schematic diagram from another angle;

[0025] Figure 6 is the structural schematic diagram of the second clamping arm;

[0026] Figure 7 is the structural schematic diagram of the connecting frame;

[0027] Figure 8 is the schematic diagram after the first clamping arm and the second clamping arm are opened;

[0028] Figure 9 is the schematic diagram of the cooperation between the present utility model and the hydraulic wrist.

[0029] Reference numerals: 1, connecting frame; 2, connecting arm; 3, connecting beam; 4, front connecting shaft; 5, rear connecting shaft; 6, driving cylinder; 7, first clamping arm; 8, second clamping arm; 9, connecting rod; 10, connecting body; 11, first clamping piece; 12, second clamping piece; 13, receiving opening; 14, first hinge hole; 15, second hinge hole; 16, third hinge hole; 17, fourth hinge hole; 18, fifth hinge hole; 19, sixth hinge hole; 20, reinforcing rib; 21, protective plate; 22, hydraulic wrist; 23, bayonet; 24, connecting hole. Detailed implementation manners

[0030] The present utility model will be clearly and completely described below in conjunction with the embodiments.

[0031] It should be noted that all the directional indications (such as up, down, left, right, front, rear...) in the embodiments of the present utility model are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0032] In the description of the embodiments, unless otherwise clearly defined and limited, terms such as "arrangement" and "connection" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or connected through an intermediate medium, and may also be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0033] See the appendix Figures 1-7 , which shows a clamping mechanism for cooperating with a hydraulic wrist, including a connecting frame 1. The connecting frame 1 is of a U-shaped structure as a whole. The connecting frame 1 is provided with a connecting beam 3. Both ends of the connecting beam 3 are symmetrically provided with connecting arms 2. One end of each of the two connecting arms 2 away from the connecting beam 3 is hinged with a driving cylinder 6. The driving cylinder 6 is specifically an oil cylinder. Both ends of the connecting beam 3 are respectively hinged with a first clamping arm 7 and a second clamping arm 8;

[0034] Among them, the first clamping arm 7 includes a connecting body 10 of a similar triangle structure. Both sides of the connecting body 10 are respectively provided with a first clamping piece 11 and a second clamping piece 12. The first clamping piece 11 and the second clamping piece 12 are parallel to each other. A receiving opening 13 is formed between the opposing side walls of the first clamping piece 11 and the second clamping piece 12. The width of the receiving opening 13 is greater than the thickness of the second clamping arm 8. When the first clamping arm 7 and the second clamping arm 8 are closed, the second clamping arm 8 is exactly received in the first clamping arm 7 through the receiving opening 13;

[0035] The first clamping arm 7 is provided with a first hinge hole 14 through the first clamping piece 11 and the second clamping piece 12. The first hinge hole 14 is hinged with the output end of the driving cylinder 6. The first clamping arm 7 is provided with a second hinge hole 15 through the first clamping piece 11, the second clamping piece 12 and the connecting body 10. The first clamping arm 7 is rotationally connected with the connecting beam 3 through the second hinge hole 15. When in use, the first clamping arm 7 is controlled by the driving cylinder 6 to rotate around the second hinge hole. In addition, a third hinge hole 16 is also provided on the second clamping piece 12. A connecting rod 9 is hinged to the first clamping arm 7 through the third hinge hole 16;

[0036] One end of the second clamping arm 8 is also provided with a fourth hinge hole 17, a fifth hinge hole 18 and a sixth hinge hole 19 through. Among them, the fourth hinge hole 17 is hinged with the output end of the corresponding driving cylinder 6, the fifth hinge hole 18 is rotationally connected with the connecting beam 3, and the sixth hinge hole 19 is hinged with the other end of the connecting rod 9;

[0037] It can be seen therefrom that the first clamping arm 7 and the second clamping arm 8 perform positive and negative circular arc motions under the action of the corresponding driving cylinder 6. When the first clamping arm 7 and the second clamping arm 8 move, they are synchronously linked through the action of the connecting rod 9. In this way, the first clamping arm 7 and the second clamping arm 8 realize synchronous opposite circular arc motions under the cooperation of the driving cylinder 6 and the connecting rod 9, making the force on themselves and the workpiece more uniform when the first clamping arm 7 and the second clamping arm 8 are operating, avoiding the problem of independent actions of the first clamping arm 7 and the second clamping arm 8. At the same time, through the connecting rod 9, when one of the driving cylinders 6 gets out of control, braking is achieved on the first clamping arm 7 and the second clamping arm 8, thereby preventing the workpiece from falling;

[0038] Furthermore, in order to increase the structural strength of the first clamping arm 7, reinforcing ribs 20 are provided on both sides of the first clamping piece 11 and the second clamping piece 12 away from the connecting body 10. The reinforcing ribs 20 are arranged along the outer edge of the first clamping piece 11. This not only improves the strength of the entire first clamping arm 7, but also avoids an increase in weight and reduces the working load of the excavator;

[0039] Furthermore, in order to prevent the output end of the driving cylinder 6 from being impacted during operation, a protective plate 21 is provided on the output end of the driving cylinder 6. The protective plate 21 is fixed to the end of the output end by bolts.

[0040] During use, refer to the attached Figures 8-9 , as shown, when the entire mechanism is connected to the hydraulic wrist 22, the front connecting shaft 4 is snapped into the bayonet 23 of the hydraulic wrist 22, and then the two rear connecting shafts 5 are inserted into the connecting holes 24 of the hydraulic wrist 22. Then, the hydraulic wrist 22 drives the entire mechanism to realize the angle adjustment during clamping. At the same time, the driving cylinder 6 drives the first clamping arm 7 and the second clamping arm 8 to perform synchronous opposite circular arc motions under the cooperation of the connecting rod 9. When the output end of the driving cylinder 6 extends, the first clamping arm 7 and the second clamping arm 8 close, and when the output end retracts, the first clamping arm 7 and the second clamping arm 8 open. In this way, the first clamping arm 7 and the second clamping arm 8 always open and close symmetrically about the axis of the connecting beam 3.

[0041] The above is only the preferred specific implementation manner of the present invention, and does not limit the protection scope of the present invention accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A clamping mechanism for cooperating with a hydraulic wrist, comprising a connecting frame (1), wherein a front connecting shaft (4) and a rear connecting shaft (5) are respectively arranged at the front and rear ends of the connecting frame (1), and the characteristics are as follows: One end of the connecting frame (1) is hinged with a first clamping arm (7) and a second clamping arm (8), and the other end of the connecting frame (1) is hinged with a driving cylinder (6); A connecting rod (9) is hinged between one ends of the first clamping arm (7) and the second clamping arm (8) close to the connecting frame (1), and the driving cylinder (6) controls the first clamping arm (7) and the second clamping arm (8) to perform synchronous circular arc movements towards each other in cooperation with the connecting rod (9).

2. The clamping mechanism for cooperating with a hydraulic wrist according to claim 1, characterized in that: The number of the driving cylinders (6) is two, and they are respectively arranged on both sides of the connecting frame (1), and the output ends of the two driving cylinders (6) are respectively hinged with the corresponding first clamping arm (7) and second clamping arm (8).

3. The clamping mechanism for cooperating with a hydraulic wrist according to claim 1, characterized in that: The first clamping arm (7) includes a connecting body (10), and a first clamping piece (11) and a second clamping piece (12) are respectively arranged on both sides of the connecting body (10). An accommodating opening (13) is formed between the first clamping piece (11) and the second clamping piece (12), and the width of the accommodating opening (13) is greater than the thickness of the second clamping arm (8).

4. A clamping mechanism for cooperating with a hydraulic wrist, characterized in that: At one end of the first clamping arm (7) close to the connecting frame (1) and at the vertex position of a virtual triangle, a first hinge hole (14), a second hinge hole (15) and a third hinge hole (16) are respectively penetrated. Among them, the first hinge hole (14) is matched with the output end of the corresponding driving cylinder (6), the second hinge hole (15) is rotatably connected with the connecting frame (1), and the third hinge hole (16) is hinged with one end of the connecting rod (9).

5. The clamping mechanism for cooperating with a hydraulic wrist according to claim 3, characterized in that: Reinforcing ribs (20) are arranged on the sides of the first clamping piece (11) and the second clamping piece (12) away from the accommodating opening (13).

6. The clamping mechanism for cooperating with a hydraulic wrist according to claim 1, wherein: The connecting frame (1) is integrally U-shaped and includes two symmetric connecting arms (2). A connecting beam (3) is arranged between one ends of the two connecting arms (2). The first clamping arm (7) and the second clamping arm (8) are both rotatably connected with the connecting beam (3). At one end of the second clamping arm (8) close to the connecting frame (1) and at the vertex position of a virtual triangle, a fourth hinge hole (17), a fifth hinge hole (18) and a sixth hinge hole (19) are respectively penetrated. Among them, the fourth hinge hole (17) is matched with the output end of the corresponding driving cylinder (6), the fifth hinge hole (18) is rotatably connected with the connecting frame (1), and the sixth hinge hole (19) is hinged with the other end of the connecting rod (9). The connecting arm (2) can be accommodated in the first clamping arm (7) when closed.

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