Single oil port high frequency high speed piston cylinder

Abstract

The utility model relates to a piston cylinder technical field, especially a single oil port high frequency high speed piston cylinder, including cylinder body, piston assembly, have rod cavity and rodless cavity, piston assembly has oil return hole, check valve hole and oil inlet hole, oil inlet hole is communicated with oil return hole and check valve hole simultaneously, the orifice of oil return hole and check valve hole is located in the rod cavity, the orifice of oil inlet hole is located in the rodless cavity, the orifice of oil return hole is located in the orifice front of check valve hole, when piston assembly stretches out and approaches the end of stroke, the orifice of oil return hole enters the front end hole of cylinder body and is closed by the hole wall of front end hole, the check valve of one way conduction to the rod cavity is installed in check valve hole, and the cylinder body has the main oil hole that communicates with the rodless cavity. Advantageous effects are: the scheme can realize the high frequency reciprocating motion of piston cylinder without external force or no load only with one main oil hole, simplifies the pipeline connection and improves the system response speed. Moreover, the buffer function of the end of stretching out motion can be realized without additional buffer mechanism.

Description

Technical Field

[0001] This utility model relates to the field of piston cylinder technology, and in particular to a single-port high-frequency high-speed piston cylinder. Background Technology

[0002] Many devices using hydraulic cylinders require reciprocating motion to achieve related actions. To achieve reciprocating motion, the piston cylinder is generally equipped with inlet and outlet ports that communicate with the rodless chamber and the rod chamber respectively, or the plunger cylinder is equipped with a single oil port that retracts by external force or load. At the same time, to prevent mechanical impact due to excessive speed when the moving parts move to the end of the stationary parts, a buffer mechanism is usually installed at the end of the hydraulic cylinder to slow down the speed of the moving parts. Utility Model Content

[0003] The technical problem to be solved by this utility model is that existing hydraulic cylinders require two oil holes or external force to achieve reciprocating motion, resulting in complex structure and numerous pipelines, making it difficult to meet the compact requirements of high-frequency and high-speed reciprocating motion.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a single-port high-frequency high-speed piston cylinder, including a cylinder body, a piston assembly, a rod chamber and a rodless chamber. The piston assembly is installed in the cylinder body and consists of a piston rod and a piston. The end with the piston is the rear end of the piston assembly. The piston assembly has a return oil hole, a one-way valve hole and an oil inlet hole. The oil inlet hole communicates with both the return oil hole and the one-way valve hole. The openings of the return oil hole and the one-way valve hole are located in the rod chamber, the opening of the oil inlet hole is located in the rodless chamber, and the opening of the return oil hole is located in front of the opening of the one-way valve hole. When the piston assembly extends and approaches the end of its stroke, the opening of the return oil hole enters the front end hole of the cylinder body and is sealed by the hole wall of the front end hole. A one-way valve that unidirectionally guides the rod chamber is installed in the one-way valve hole. The cylinder body has a main oil hole that communicates with the rodless chamber.

[0005] In some embodiments, the piston assembly may optionally consist of a piston rod and a piston, with one end having the piston being the rear end of the piston assembly, and the opening of the oil inlet located on the end face of the rear end of the piston assembly, with the oil inlet extending axially along the piston rod.

[0006] In some embodiments, optionally, the return port and the check valve port both extend radially along the piston assembly and are located on the piston rod.

[0007] In some embodiments, the cylinder body may optionally include a cylinder barrel, a guide sleeve mounted at the front end of the cylinder barrel, and a rear end cover mounted at the rear end of the cylinder barrel, wherein the inner hole of the guide sleeve is the front end hole of the cylinder body, and the main oil hole is located on the rear end cover.

[0008] The beneficial effects of this utility model are: this solution only requires one main oil hole to realize high-frequency reciprocating motion of the piston cylinder without external force or load, which simplifies pipeline connection and improves system response speed.

[0009] Moreover, it can achieve the cushioning function of the extended end of the movement without the need for an additional cushioning mechanism. Attached Figure Description

[0010] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0011] Figure 1 This is a schematic diagram of the piston cylinder of the present invention at the beginning of its stroke.

[0012] Figure 2 This is a schematic diagram of the piston cylinder of this utility model in a buffer state;

[0013] Figure 3 This is a schematic diagram of the piston cylinder of this utility model at the end of its stroke.

[0014] In the diagram, 1. Piston rod, 2. Piston, 3. Rod chamber, 4. Rodless chamber, 5. Oil return hole, 6. Check valve hole, 7. Oil inlet hole, 8. Cylinder, 9. Guide sleeve, 10. Rear end cap, 11. Check valve, 12. Main oil hole. Detailed Implementation

[0015] like Figures 1-3 As shown, a single-port high-frequency high-speed piston cylinder includes a cylinder body, a piston assembly, a rod chamber 3, and a rodless chamber 4. The piston assembly is installed in the cylinder body and consists of a piston rod 1 and a piston 2. One end of the piston 2 is the rear end of the piston assembly. The piston assembly has a return oil hole 5, a one-way valve hole 6, and an oil inlet hole 7. The oil inlet hole 7 communicates with both the return oil hole 5 and the one-way valve hole 6. The openings of the return oil hole 5 and the one-way valve hole 6 are located in the rod chamber 3, the opening of the oil inlet hole 7 is located in the rodless chamber 4, and the opening of the return oil hole 5 is located in front of the opening of the one-way valve hole 6. When the piston assembly extends and approaches the end of its stroke, the opening of the return oil hole 5 enters the front end hole of the cylinder body and is sealed by the hole wall of the front end hole. A one-way valve 11 that unidirectionally guides the rod chamber 3 is installed in the one-way valve hole 6. The cylinder body has a main oil hole 12 that communicates with the rodless chamber 4.

[0016] The one-way valve 11 allows oil to flow into the rod chamber 3 through the one-way valve orifice 6, but it cannot flow out.

[0017] The effective area of ​​the rodless cavity 4 is A1, and the effective area of ​​the rod cavity 3 is A2.

[0018] The opening of the oil inlet 7 is located on the end face of the rear end of the piston assembly, and the oil inlet 7 extends axially along the piston rod 1.

[0019] The oil return hole 5 and the one-way valve hole 6 both extend radially along the piston assembly and are located on the piston rod 1.

[0020] The cylinder block includes a cylinder barrel 8, a guide sleeve 9 installed at the front end of the cylinder barrel 8, and a rear end cover 10 installed at the rear end of the cylinder barrel 8. The inner hole of the guide sleeve 9 is the front end hole of the cylinder block, and the main oil hole 12 is located on the rear end cover 10.

[0021] There are multiple oil return holes 5 and one-way valve holes 6, which are evenly distributed around the piston rod 1 to ensure sufficient oil flow.

[0022] like Figure 1 As shown, at this time, the piston assembly in the piston cylinder is at the front end of the stroke. Oil enters through the main oil hole 12, and the oil enters the rodless chamber 4 and the oil inlet 7 in sequence. Then, it enters the rod chamber 3 through the one-way valve hole 6 and the return oil hole 5. Since the effective area A1 of the rodless chamber 4 is greater than the effective area A2 of the rod chamber 3, F1=A1×P1>F2=A2×P2, P1=P2. Here, P1 and P2 are the oil pressures in the rodless chamber 4 and the rod chamber 3, respectively. F1 is the force exerted by the oil pressure in the rodless chamber 4 on the piston 2, and F2 is the force exerted by the oil pressure in the rod chamber 4 on the piston 2. Therefore, the force on the piston assembly is the force formed by the piston rod section A3, which makes the piston rod 1 move quickly to the left. The volume of the rod chamber 3 gradually decreases, and the oil returns through the return oil hole 5.

[0023] like Figure 2 As shown, when the piston rod 1 continues to move to the left, the return oil hole 5 gradually enters the guide sleeve 9, and the flow area of ​​the return oil hole 5 gradually decreases. Since the one-way valve hole 6 can only be unidirectionally guided, the oil cannot return through the one-way valve hole 6. At this time, the oil in the rod chamber 3 can only return through the return oil hole 5, which has a gradually decreasing flow area. The return oil is blocked, and the speed of the piston rod 1 moving to the left gradually decreases as the flow area of ​​the return oil decreases.

[0024] like Figure 3 As shown, the piston rod 1 continues to move to the left, and the oil return hole 5 is completely blocked, forming a sealed space in the rod chamber 3. Due to the high-speed movement of the piston rod 1 and the sealed rod chamber 3, the oil pressure in the rod chamber 3 increases instantaneously. At this time, the pressure P2 in the rod chamber 3 increases several times. The instantaneous thrust formed by the instantaneous high pressure P2 in the rod chamber 3 will be much greater than the instantaneous thrust in the rodless chamber 4, as shown in the formula, F2=A2×P2>F1=A1×P1, causing the piston rod 1 to move back to the right quickly, thereby completing the reciprocating motion of the piston cylinder.

[0025] This piston cylinder is typically used in high-frequency, high-speed ejection conditions with an ejection frequency exceeding 60 times / minute and rapid retraction without load.

[0026] In this embodiment, the piston 2 has a diameter of 140 mm, the piston rod has a diameter of 110 mm, the return oil hole 5 and the one-way valve hole 6 have diameters of 16 mm, and the inlet oil hole 7 has a diameter of 40 mm. There are 6 to 8 return oil holes 5 and one-way valve holes 6, which are evenly arranged around the circumference of the piston rod 1.

Claims

1. A single-port high-frequency high-speed piston cylinder, characterized in that: The cylinder includes a cylinder body, a piston assembly, a rod chamber (3), and a rodless chamber (4). The piston assembly is installed in the cylinder body and has an oil return hole (5), a check valve hole (6), and an oil inlet hole (7). The oil inlet hole (7) communicates with both the oil return hole (5) and the check valve hole (6). The openings of the oil return hole (5) and the check valve hole (6) are located in the rod chamber (3), and the opening of the oil inlet hole (7) is located in the rodless chamber (4). The opening of the oil return hole (5) is located in front of the opening of the check valve hole (6). When the piston assembly extends and approaches the end of its stroke, the opening of the oil return hole (5) enters the front end hole of the cylinder body and is sealed by the hole wall of the front end hole. A check valve (11) that unidirectionally flows to the rod chamber (3) is installed in the check valve hole (6). The cylinder body has a main oil hole (12) that communicates with the rodless chamber (4).

2. The single-port high-frequency high-speed piston cylinder according to claim 1, characterized in that: The piston assembly consists of a piston rod (1) and a piston (2). The end with the piston (2) is the rear end of the piston assembly. The opening of the oil inlet (7) is located on the end face of the rear end of the piston assembly. The oil inlet (7) extends axially along the piston rod (1).

3. The single-port high-frequency high-speed piston cylinder according to claim 2, characterized in that: The oil return hole (5) and the one-way valve hole (6) both extend radially along the piston assembly and are located on the piston rod (1).

4. The single-port high-frequency high-speed piston cylinder according to claim 1, characterized in that: The cylinder body includes a cylinder barrel (8), a guide sleeve (9) installed at the front end of the cylinder barrel (8), and a rear end cover (10) installed at the rear end of the cylinder barrel (8). The inner hole of the guide sleeve (9) is the front end hole of the cylinder body, and the main oil hole (12) is located on the rear end cover (10).

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