Hook oil cylinder and backhoe loader hook oil cylinder structure thereof

Abstract

The utility model discloses a hook oil cylinder and a loader-digger hook oil cylinder structure thereof, and belongs to the technical field of engineering machinery. The hook oil cylinder structure overcomes the defect that a hook oil cylinder is damaged due to the fact that a working device is lifted and impacts a hook in a hook oil cylinder structure of a traditional backhoe loader in the prior art. The main body structure of the hook oil cylinder comprises a hook oil cylinder, the hook oil cylinder comprises a cylinder barrel, a piston, a cylinder rod and a sealing assembly arranged on the outer ring of the cylinder rod in a sleeving mode are arranged in the cylinder barrel, one end of the cylinder rod is connected with the piston, and the other end of the cylinder rod is sealed through the sealing assembly and extends out of the cylinder barrel; a cylinder bottom is arranged at an assembly hole in one end of the cylinder barrel. The utility model is mainly applied to engineering machinery such as backhoe loaders and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of engineering machinery, and in particular relates to a hook oil cylinder and a hook oil cylinder structure of an excavator loader. Background Art

[0002] The front end of the backhoe loader is a loading device, and the rear end is an excavating device. During loading operations or transfers, the working device at the excavating end needs to be fixed to prevent the valve core at the excavating end from leaking and causing the working device to fall, thereby creating a safety hazard.

[0003] In the existing hook structure of the excavator loader, when it is necessary to hook the working device at the excavation end, the working device needs to be lifted to a certain height so that the hook hooks the fixing pin of the working device. At this time, the solenoid valve is energized, and the oil supply device supplies oil to the large chamber of the oil cylinder to extend the cylinder rod. During the whole process, the hook is lifted around the connecting pin between the hook and the vehicle body swing frame. When it is lifted to the top, the solenoid valve is de-energized, the hydraulic oil in the large chamber of the hook cylinder returns, and the hook cylinder lever falls back. At this time, the hook will fall around the connecting pin between the hook and the vehicle body swing frame under the action of its own weight, hook the fixing pin of the working device, and thus hook the working device.

[0004] When it is necessary to release the working device at the excavation end, the solenoid valve is powered on, and the oil supply device supplies oil to the oil cylinder, so that the hook is lifted to a certain height, leaving space for the hook to fall and reset, and then the working device is operated to fall, and the solenoid valve is powered off. The hook falls under its own weight, and the hydraulic oil in the hook oil cylinder returns to the oil tank from the T port of the solenoid valve; the above-mentioned prior art has the following shortcomings:

[0005] 1. When releasing the working device, if the oil return of the hook cylinder is not timely, when operating the working device, the working device will hit the hook when it is lifted, thereby damaging the hook cylinder;

[0006] 2. The hydraulic oil that drives the hook cylinder is often not released in time due to temperature and assembly reasons, which often causes the cylinder to be damaged. Utility Model Content

[0007] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a hook oil cylinder and a hook oil cylinder structure of an excavator loader.

[0008] In order to achieve the above purpose, the utility model is implemented by adopting the following technical solutions:

[0009] A hook oil cylinder comprises a cylinder barrel, in which a piston, a cylinder rod and a sealing assembly sleeved on the outer ring of the cylinder rod are arranged, one end of the cylinder rod is connected to the piston, and the other end is sealed by the sealing assembly and extends out of the cylinder barrel, a connecting hole for connecting a large cavity and a small cavity of the oil cylinder is arranged on the piston, and a cylinder bottom is arranged at the assembly hole at one end of the cylinder barrel.

[0010] Preferably, a boss for preventing the sealing assembly from moving is provided on the inner side of the cylinder, and the boss is provided on one side of the sealing assembly.

[0011] Preferably, the outer ring of the piston is provided with a pressure groove for reducing the friction between the piston and the cylinder.

[0012] Preferably, the sealing assembly comprises a V-shaped sealing ring 1, a retaining ring, a V-shaped sealing ring 2 and a guide sleeve which are arranged in sequence.

[0013] Preferably, a cylinder rod head is installed at the end of the cylinder rod extending outside the cylinder barrel, and the cylinder rod head is connected to the cylinder rod by welding or by threads.

[0014] Preferably, the cylinder rod and the piston are clamped by a retaining spring or connected by threads.

[0015] Preferably, the cylinder barrel is connected to the cylinder bottom by welding.

[0016] A hook cylinder structure for an excavator loader includes a hook and a working device fixing pin arranged on the working device. The hook cylinder structure for the excavator loader also includes a hook cylinder as described in any one of the above items, the fixed end of the hook cylinder is hingedly connected to the vehicle body, the extended end of the hook cylinder is hingedly connected to the hook, and the hook is hingedly connected to the vehicle body swing frame through the hook connecting pin.

[0017] Preferably, a hook cylinder bracket is provided at the fixed end of the hook cylinder, the hook cylinder bracket is hingedly connected to the vehicle body through a hook cylinder cylinder body connecting pin, and the cylinder rod on the hook cylinder is hingedly connected to the hook through a cylinder rod connecting pin.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] 1. A connecting hole is opened on the piston of the hook cylinder to connect the large and small chambers. When the hook falls, part of the oil can directly enter the small chamber from the connecting hole opened on the piston, which can speed up the discharge speed of the hydraulic oil in the large chamber. Because the piston has a connecting hole and the large and small chambers are connected, the force of the piston to lift the hook is the product of the hydraulic pressure and the area of ​​the piston rod. Therefore, the area of ​​the piston is as small as possible. When the large chamber is filled with oil, the hook can be lifted up. In this way, the volume of the small chamber can be increased to meet the needs of rapid falling.

[0020] 2. The outer ring of the piston is provided with a pressure groove to reduce the friction between the piston and the cylinder, so as to reduce the influence of friction when the piston falls;

[0021] To sum up, a connecting hole is opened on the piston of the hook cylinder to connect the large and small chambers, so that the hydraulic oil in the large chamber of the hook cylinder can be discharged as soon as possible, so that the hook can fall quickly, and the hook cylinder can be prevented from being damaged when the working device is operated due to untimely falling. At the same time, the piston and the cylinder joint surface adopts the method of opening a pressure groove to reduce the friction between the piston and the cylinder body, so that the hydraulic oil can be discharged from the large chamber as soon as possible. In addition, the materials used for the hook cylinder in the utility model are simple, the manufacturing process is convenient, and the production cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a structural schematic diagram of the hook oil cylinder in the utility model;

[0023] Figure 2 for Figure 1 Sectional view at AA in the middle;

[0024] Figure 3 This is a schematic diagram of the structure of Example 3 of the present utility model;

[0025] Figure 4 for Figure 3 A partial enlarged view of point B in the middle;

[0026] Figure 5 The utility model is a schematic diagram of the hydraulic system when the hook cylinder is working.

[0027] In the figure: 1. cylinder rod connecting pin; 2. hook; 3. hook connecting pin; 4. hook cylinder body connecting pin; 5. working device fixing pin; 6. hook cylinder; 7. hook cylinder bracket; 9. hydraulic oil tank; 61. cylinder bottom; 62. piston; 63. cylinder barrel; 64. cylinder rod; 65. V-type sealing ring 1; 66. retaining ring; 67. V-type sealing ring 2; 68. guide sleeve; 69. cylinder rod head; 610. connecting hole; 611. boss; 612. pressure groove. DETAILED DESCRIPTION

[0028] The present invention will be further described below through specific embodiments in conjunction with the accompanying drawings.

[0029] Embodiment 1:

[0030] like Figure 1-2 As shown, a hook cylinder includes a cylinder barrel 63, in which a piston 62, a cylinder rod 64 and a sealing assembly sleeved on the outer ring of the cylinder rod 64 are arranged. One end of the cylinder rod 64 is connected to the piston 62, and the cylinder rod 64 and the piston 62 are clamped by a retaining spring or connected by threads, or extruded after assembly, and the other end is sealed by the sealing assembly and extends out of the cylinder barrel 63. A connecting hole 610 for connecting the large cavity and the small cavity of the cylinder is provided on the piston 62, and a cylinder bottom 61 is provided at the assembly hole at one end of the cylinder barrel 63. Specifically, the cylinder barrel 63 and the cylinder bottom 61 are welded and connected.

[0031] In this embodiment, the number and size of the connecting holes 610 are determined according to needs. After drilling, when the hook 2 falls, a portion of the oil can directly enter the small cavity from the connecting hole 610 opened on the piston 62, which can speed up the discharge of the hydraulic oil in the large cavity. Because the piston 62 opens the connecting hole 610, the large and small cavities are connected, and the force of the piston 62 to lift the hook is the product of the hydraulic pressure and the area of ​​the piston rod. Therefore, the area of ​​the cylinder rod 64 is as small as possible. When the oil inflow of the large cavity is satisfied, the hook 2 can be lifted, which can increase the volume of the small cavity and meet the demand for rapid falling.

[0032] Embodiment 2:

[0033] A hook oil cylinder is different from the embodiment 1 in that a boss 611 for preventing the sealing assembly from moving is provided on the inner side of the cylinder barrel 63, and the boss 611 is provided on one side of the sealing assembly.

[0034] Furthermore, the outer ring of the piston 62 is provided with a pressure groove 612 for reducing the friction between the piston 62 and the cylinder 63, and the pressure groove 612 reduces the influence of the friction on the piston 62 when it falls.

[0035] Furthermore, the sealing assembly includes a V-shaped sealing ring 1 65, a retaining ring 66, a V-shaped sealing ring 2 67 and a guide sleeve 68 arranged in sequence. A sealing assembly that can ensure the sealing of the small cavity from the outside is used between the cylinder rod 64 and the mounting hole on the cylinder barrel 63 to prevent leakage of the small cavity. The sealing assembly in this embodiment can also be any three or any two combinations of the V-shaped sealing ring 1 65, the retaining ring 66, the V-shaped sealing ring 2 67 and the guide sleeve 68.

[0036] Furthermore, a cylinder rod head 69 is installed at the end of the cylinder rod 64 extending out of the cylinder barrel 63 , and the cylinder rod head 69 is connected to the cylinder rod 64 by welding or by threads.

[0037] Embodiment 3:

[0038] like Figure 3-4 As shown, a hook cylinder structure of an excavator loader includes a hook 2 and a working device fixing pin 5 arranged on the working device. The hook cylinder structure of the excavator loader also includes a hook cylinder 6 as described in Example 1 or Example 2, the fixed end of the hook cylinder 6 is hingedly connected to the vehicle body, the protruding end of the hook cylinder 6 is hingedly connected to the hook 2, and the hook 2 is hingedly connected to the vehicle body swing frame through the hook connecting pin 3.

[0039] Furthermore, a hook cylinder bracket 7 is provided at the fixed end of the hook cylinder 6, and the hook cylinder bracket 7 is hingedly connected to the vehicle body through the hook cylinder cylinder body connecting pin 4, and the cylinder rod 64 on the hook cylinder 6 is hingedly connected to the hook 2 through the cylinder rod connecting pin 1.

[0040] The utility model has a cylinder head-free structure, which is similar to a gas spring. The cylinder barrel 63 is a steel pipe through which a base with a hole is extruded. The base can block the sealing component to ensure the sealing between the cylinder barrel 63 and the piston 62. After the sealing component is installed in the cylinder barrel 63, a boss 611 is extruded on the left side of the sealing component to block the sealing component. In this way, the sealing component can be confined between the boss 611 and the base to play a sealing role in the cylinder barrel 63 and the cylinder head. After the piston 62, cylinder barrel 63, cylinder rod 64, V-shaped sealing ring 1 65, retaining ring 66, V-shaped sealing ring 2 67, guide sleeve 68, and cylinder rod head 69 are assembled, the cylinder bottom 61 and the cylinder barrel 63 are sealed by welding. The materials used in the above-mentioned hook oil cylinder 6 are simple, the manufacturing process is convenient, and the product is of good quality and low price.

[0041] like Figure 5 As shown, when the hook cylinder 6 is working, the operation process of the hydraulic oil in the hook cylinder 6 is:

[0042] When the hook cylinder 6 is lifted, the piston 62 is at the lowest part, the large chamber of the hook cylinder 6 has no hydraulic oil, but the small chamber has hydraulic oil. The hydraulic oil in the system enters the large chamber through the oil port at the bottom of the cylinder 61, lifting the piston 62. At the same time, the hydraulic oil in the small chamber enters the large chamber through the connecting hole 610 on the piston 62 until the cylinder rod 64 is fully extended, greatly improving the lifting speed.

[0043] When the hook cylinder 6 descends, the large chamber of the hook cylinder 6 is filled with hydraulic oil, and the small chamber is free of hydraulic oil. The large chamber of the hook cylinder 6 is connected to the hydraulic oil tank 9. Due to the deadweight of the hook 2 pressing down the cylinder rod 64, the piston 62 moves downward, and part of the hydraulic oil in the large chamber returns to the hydraulic oil tank 9 through the oil port 61 on the cylinder bottom, and the other part enters the small chamber through the connecting hole 610 on the piston 62, shortening the time for the cylinder rod 64 to retract, allowing the hook 2 to fall quickly, and avoiding the hook 2 from falling untimely due to the operation of the working device, causing the working device fixing pin 5 to hit the hook cylinder 6 during operation.

Claims

1. A hook cylinder, comprising a cylinder barrel (63), characterized in that: The cylinder barrel (63) is provided with a piston (62), a cylinder rod (64) and a sealing assembly sleeved on the outer ring of the cylinder rod (64); one end of the cylinder rod (64) is connected to the piston (62), and the other end is sealed by the sealing assembly and extends out of the cylinder barrel (63); a connecting hole (610) for connecting the large chamber and the small chamber of the oil cylinder is provided on the piston (62); and a cylinder bottom (61) is provided at the assembly hole at one end of the cylinder barrel (63).

2. The hook cylinder according to claim 1, characterized in that: A boss (611) for preventing the sealing component from moving is arranged on the inner side of the cylinder (63), and the boss (611) is arranged on one side of the sealing component.

3. The hook cylinder according to claim 1, characterized in that: The outer ring of the piston (62) is provided with a pressure groove (612) for reducing the friction between the piston (62) and the cylinder (63).

4. The hook cylinder according to claim 2, characterized in that: The sealing assembly comprises a V-shaped sealing ring 1 (65), a retaining ring (66), a V-shaped sealing ring 2 (67) and a guide sleeve (68) which are arranged in sequence.

5. The hook cylinder according to claim 4, characterized in that: The end of the cylinder rod (64) extending outside the cylinder barrel (63) is provided with a cylinder rod head (69), and the cylinder rod head (69) is connected to the cylinder rod (64) by welding or by threading.

6. The hook cylinder according to any one of claims 1 to 5, characterized in that: The cylinder rod (64) and the piston (62) are clamped by a clamping spring or connected by threads.

7. The hook cylinder according to any one of claims 1 to 5, characterized in that: The cylinder barrel (63) is connected to the cylinder bottom (61) by welding.

8. A hook cylinder structure for an excavator loader, comprising a hook (2) and a working device fixing pin (5) arranged on a working device, characterized in that: The hook cylinder structure of the excavator loader also includes a hook cylinder (6) as described in any one of claims 1 to 5, the fixed end of the hook cylinder (6) is hingedly connected to the vehicle body, the extended end of the hook cylinder (6) is hingedly connected to the hook (2), and the hook (2) is hingedly connected to the vehicle body swing frame via a hook connecting pin (3).

9. The hook cylinder structure of the backhoe loader according to claim 8, characterized in that: A hook cylinder bracket (7) is provided at the fixed end of the hook cylinder (6); the hook cylinder bracket (7) is hingedly connected to the vehicle body via a hook cylinder cylinder body connecting pin (4); and a cylinder rod (64) on the hook cylinder (6) is hingedly connected to the hook (2) via a cylinder rod connecting pin (1).

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