Safety quick-change oil cylinder for excavator

Abstract

The present application belongs to the technical field of quick-change oil cylinder for excavator, and relates to a safe quick-change oil cylinder for excavator, which comprises an oil cylinder body, the oil cylinder body comprises a cylinder body, a piston, a piston rod and a cylinder cover, the left and right sides of the piston form a first chamber and a second chamber, a hydraulic control check valve and a position control check valve are arranged on the cylinder body, a hydraulic control first interface of the hydraulic control check valve is communicated with the first chamber, a hydraulic control second interface of the hydraulic control check valve is connected with a first oil port, a hydraulic control third interface of the hydraulic control check valve is communicated with a position control second interface of the position control check valve, the position control second interface is communicated with the second chamber, a position control first interface of the position control check valve is communicated with a second oil port, the hydraulic control check valve is integrated on the cylinder body, and the safe quick-change oil cylinder has the advantages of compact structure design, short oil circuit, small process hole, few fault points, low cost and the like, the hydraulic control first interface is directly communicated with the inside of the cylinder barrel, so that the pressure maintaining is more reliable, and in addition, the position control check valve is specially arranged on the cylinder bottom, so that the piston rod cannot be retracted in the working position, and the misoperation is prevented, and the safe quick-change oil cylinder is safe and reliable.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of quick-change oil cylinders for excavators, and particularly relates to a safe quick-change oil cylinder for excavators. BACKGROUND

[0002] The quick-change oil cylinder is an important supporting part in the field of engineering machinery, which makes the piston rod move linearly relative to the oil cylinder body by using hydraulic pressure in the working process, and is commonly used in the quick-change device of an excavator to realize the quick replacement of a bucket or a tool to meet the operation requirements of the excavator.

[0003] The existing quick-change oil cylinder for excavators is provided with a hydraulic control check valve outside the cylinder body, the hydraulic control check valve of this structure protrudes outside the cylinder body, which not only increases the volume of the oil cylinder, but also is easy to be damaged due to bumping in the operation process, thereby affecting the normal excavation operation; in addition, in the existing quick-change oil cylinder for excavators, the hydraulic control check valve and the cavity for oil cylinder pressure maintaining are connected through an oil pipe, the oil way is long, the process hole is much, the cost is high, oil leakage is easy to occur, pressure maintaining is not realized, the reliability of the excavator operation is reduced, and in addition, the oil port setting integration of the existing quick-change oil cylinder for excavators is low, and the hydraulic control check valve cannot be directly connected, so the safety is low.

[0004] In addition, usually for safety, a spring preventing the piston rod from retracting is installed on the quick-change device to prevent the oil cylinder pressure maintaining from failing, which causes the quick-change device to be large in size. Most importantly, the existing quick-change device can control the piston rod to retract regardless of the working position, cannot prevent misoperation, and is low in safety. SUMMARY

[0005] The present application provides a safe quick-change oil cylinder for excavators, which can solve the problems pointed out in the background art.

[0006] A safe quick-change oil cylinder for excavators, comprising an oil cylinder body, the oil cylinder body comprising a cylinder body, a piston, a piston rod, and a cylinder cover, the left and right sides of the piston forming a first cavity and a second cavity, the cylinder body being provided with a hydraulic control check valve and a position control check valve, the hydraulic control first interface of the hydraulic control check valve being in communication with the first cavity, the hydraulic control second interface thereof being connected with a first oil port, the hydraulic control third interface thereof being in communication with the position control second interface of the position control check valve, the position control second interface being in communication with the second cavity, the position control first interface thereof being in communication with a second oil port, the position control check valve comprising a valve body and a limiting cavity, the valve body being connected with the limiting cavity perpendicularly, a limiting chamber being formed in the limiting cavity, a spring cavity being formed in the valve body, a compression spring being arranged in the spring cavity, a movable ball being arranged at the outer side end of the compression spring to block the opening of the spring cavity, the spring cavity being connected with the second interface, the movable ball being capable of moving to the end of the limiting cavity under the action of an external force, and the other end of the limiting cavity being connected with the first interface.

[0007] Preferably, the cylinder body comprises a cylinder bottom and a cylinder barrel, and the hydraulic control check valve and the position control check valve are both arranged in the cylinder bottom.

[0008] Preferably, a guide rod is arranged in the middle part of the piston rod, and a gas sealing cavity is formed between the guide rod and the piston rod, and the gas sealing cavity is inflated through an inflation port.

[0009] Beneficial effects: The safety quick-change oil cylinder for excavator integrates the hydraulic control check valve on the cylinder body, has the advantages of compact structure design, short oil way, small process hole, few fault points, low cost and the like, and the hydraulic control first interface directly passes through the inside of the cylinder barrel, so that the pressure maintaining is more reliable. In addition, the cylinder bottom is provided with a special position control check valve, so that the piston rod cannot be retracted in the working position, thereby preventing misoperation and being safe and reliable. The piston rod is internally provided with a gas sealing cavity, which can store compressed gas, so that when the pressure maintaining fails, the piston rod can be prevented from being retracted, and safety is reliable. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 FIG. 1 is a schematic view of the internal structure of the present application,

[0011] Figure 2 FIG. 2 is a schematic view of the structure of the position control check valve of the present application,

[0012] Figure 3 FIG. 3 is a schematic view of the external structure of the present application,

[0013] Figure 4 FIG. 4 is a schematic view of the hydraulic principle of the present application,

[0014] Figure 5 FIG. 5 is a schematic view of the use state of the present application,

[0015] BRIEF DESCRIPTION OF DRAWINGS

[0016] Mark in the figure: cylinder body 1; piston 2; piston rod 3; cylinder cover 4; first chamber 5; second chamber 6; hydraulic control check valve 7; hydraulic control first interface 71; hydraulic control second interface 72; hydraulic control third interface 73; position control check valve 8; position control first interface 81; position control second interface 82; valve body 83; limiting cavity 84; spring cavity 85; compression spring 86; movable ball 87; limiting cavity 88; first oil port 9; second oil port 10; cylinder bottom 11; cylinder barrel 12; guide rod 13; gas sealing cavity 14; inflation port 15. DETAILED DESCRIPTION

[0017] One specific embodiment of the present application will be described in detail below with reference to the accompanying drawings, but it should be understood that the protection scope of the present application is not limited by the specific embodiment.

[0018] Example 1:

[0019] As Figures 1-4As shown, the embodiment of the present application provides a safety quick-change oil cylinder for excavator, which comprises an oil cylinder body, the oil cylinder body comprises a cylinder body 1, a piston 2, a piston rod 3, a cylinder cover 4, the left and right sides of the piston 2 form a first chamber 5 and a second chamber 6, the cylinder body 1 is provided with a hydraulic control check valve 7 and a position control check valve 8, the hydraulic control first interface 71 of the hydraulic control check valve 7 is communicated with the first chamber 5, the hydraulic control second interface 72 thereof is connected with a first oil port 9, the hydraulic control third interface 73 thereof is communicated with the position control second interface 82 of the position control check valve 8, the position control second interface 82 is communicated with the second chamber 6, and the position control first interface 81 thereof is communicated with a second oil port 10;

[0020] The position control check valve 8 comprises a valve body 83 and a limiting cavity 84, the valve body 83 is vertically connected with the limiting cavity 84, the limiting cavity 84 is provided with a limiting cavity 88, the valve body 83 is provided with a spring cavity 85, the spring cavity 85 is provided with a compression spring 86, the outer side end of the compression spring 86 is provided with a movable ball 87 for plugging the opening of the spring cavity 85, the movable ball 87 can be a steel ball, the spring cavity 85 is connected with the second interface 82, and under the action of external force, the movable ball 87 can move to the end of the limiting cavity 88, and the other end of the limiting cavity 88 is connected with the first interface 81.

[0021] Specifically, the cylinder body 1 comprises a cylinder bottom 11 and a cylinder barrel 12, the hydraulic control check valve 7 and the position control check valve 8 are both built-in in the cylinder bottom 11, and the first oil port 9 and the second oil port 10 are formed on the cylinder bottom 11.

[0022] By adopting the structure, the hydraulic control first interface 71 is communicated with the first chamber 5, so that the pressure maintaining performance of the first chamber 5 can be improved, the position control check valve 8 is arranged and communicated with the hydraulic control check valve 7 and the second chamber 6 respectively, when the quick-change oil cylinder is rotated to a non-working position (such as one of the non-working positions shown in the figure), Figure 5 When the quick-change oil cylinder is rotated to a normal position (i.e. a working position), under the action of gravity, the movable ball 87 moves to the compression spring 86, hydraulic oil enters from the first interface 81, pushes the movable ball 87 to overcome the action force of the compression spring 86 and press at the opening of the spring cavity 85 to plug the opening, i.e. the position control check valve 8 is closed, at this time, the hydraulic control check valve 7 cannot be opened, the piston rod 3 cannot be retracted, i.e. the quick-change oil cylinder and the auxiliary tool of the excavator (such as a bucket) cannot be separated, so that the misoperation can be prevented and the safety can be improved.

[0023] Embodiment 2:

[0024] In particular Figure 1As shown, the middle part of the piston rod 3 is provided with a guide rod 13, and a gas sealed cavity 14 is formed between the guide rod 13 and the piston rod 3, the gas sealed cavity 14 is inflated through an inflation port 15, the gas sealed cavity 14 can store compressed gas, and the compressed gas such as argon is injected into the gas sealed cavity 14 to make it in a pressure state, when the first chamber 5 fails to keep pressure, the piston rod 3 can be prevented from being retracted, and the safety is further improved.

[0025] The above disclosed are only several specific embodiments of the present application, but the embodiments of the present application are not limited to this, any changes that can be thought by any person skilled in the art should fall into the protection scope of the present application.

Claims

1. A safety quick-change oil cylinder for excavators, comprising an oil cylinder body, the oil cylinder body comprising a cylinder body (1), a piston (2), a piston rod (3), a cylinder cover (4), the left and right sides of the piston (2) forming a first chamber (5) and a second chamber (6), characterized in that: The cylinder (1) is provided with a hydraulic control check valve (7) and a position control check valve (8), the hydraulic control first interface (71) of the hydraulic control check valve (7) is communicated with the first chamber (5), the hydraulic control second interface (72) of the hydraulic control check valve (7) is connected with the first oil port (9), the hydraulic control third interface (73) of the hydraulic control check valve (7) is communicated with the position control second interface (82) of the position control check valve (8), the position control second interface (82) is communicated with the second chamber (6), the position control first interface (81) of the position control check valve (8) is communicated with the second oil port (10); the position control check valve (8) comprises a valve body (83) and a limiting cavity (84), the valve body (83) is vertically connected with the limiting cavity (84), a limiting cavity (88) is formed in the limiting cavity (84), a spring cavity (85) is arranged in the valve body (83), a compression spring (86) is arranged in the spring cavity (85), a movable ball (87) is arranged at the outer side end of the compression spring (86) for sealing the opening of the spring cavity (85), the spring cavity (85) is connected with the position control second interface (82), under the action of external force, the movable ball (87) can move to the end of the limiting cavity (88), the other end of the limiting cavity (88) is connected with the position control first interface (81).

2. The safety quick-change oil cylinder for excavators according to claim 1, characterized in that: The cylinder (1) comprises a cylinder bottom (11) and a cylinder barrel (12), the hydraulic control check valve (7) and the position control check valve (8) are arranged in the cylinder bottom (11).

3. The safety quick hitch cylinder for excavators as claimed in claim 1, characterized in that: The middle part of the piston rod (3) is provided with a guide rod (13), a gas sealing cavity (14) is formed between the guide rod (13) and the piston rod (3), and the gas sealing cavity (14) is inflated through an inflation port (15).

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