A hydraulic cylinder acceleration structure

Abstract

This utility model provides a hydraulic cylinder acceleration structure that can improve the cylinder's operating speed, increase work efficiency, and reduce energy consumption. It includes a quick-release control valve, a two-position two-way directional valve with a control port, an inlet, and an outlet. The control port is connected to the rod chamber oil circuit (first oil circuit) communicating with the rod chamber of the hydraulic cylinder. The inlet is connected to the rodless chamber oil circuit (second oil circuit) communicating with the rodless chamber of the hydraulic cylinder. The outlet is connected to a low-pressure oil circuit directly or via a fourth oil circuit and a pressure regulating valve. A third oil circuit supplying oil to the rodless chamber is connected to the second oil circuit. The cross-sectional area of ​​the second and fourth oil circuits is larger than that of the third oil circuit, and the flow rate of the second and fourth oil circuits is also larger than that of the third oil circuit. When the pressure in the first oil circuit is high, the quick-release control valve is in the position where the inlet and outlet are connected, the first oil circuit supplies oil to the rod chamber, and the rodless chamber returns oil to the low-pressure oil circuit through the second channel and the fourth oil circuit.

Description

Technical Field

[0001] This utility model relates to rapid movement technology of hydraulic cylinders, especially acceleration technology of high-flow hydraulic cylinders. Background Technology

[0002] With the development of mechanization, more and more fields are using machine tools, and hydraulic tools are becoming increasingly common. As tools become larger, hydraulic cylinders are also becoming larger. However, due to limitations in the cross-sectional area of ​​pipelines and valve channels, the piston rod or cylinder body of large cylinders often moves relatively slowly, leading to low work efficiency and high energy consumption. Taking hydraulic shears as an example, in order to meet the shearing force, the cylinder diameter is very large, and the amount of hydraulic oil discharged in one opening and closing is very large. However, the pump that generates high-pressure oil and the channels of the control valves generally cannot be made too large. This forces the hydraulic shears to open and close slowly, affecting work efficiency.

[0003] Therefore, a hydraulic structure that can enable the cylinder to move quickly is needed. Utility Model Content

[0004] The purpose of this invention is to provide a hydraulic cylinder acceleration structure that can improve the operating speed of the hydraulic cylinder, especially during low-pressure rapid advance in the rod chamber. This not only improves work efficiency but also reduces energy consumption. Moreover, it can automatically achieve various functions without control and has good practical value.

[0005] To achieve the above-mentioned technical objectives, the technical solution adopted by this utility model is as follows:

[0006] A hydraulic cylinder acceleration structure includes a rapid oil discharge control valve, which is a two-position two-way directional valve with a control port, an inlet port, and an outlet port. The control port is connected to a rod chamber oil circuit (i.e., a first oil circuit) communicating with the rod chamber of the hydraulic cylinder. The inlet port is connected to a rodless chamber oil circuit (i.e., a second oil circuit) communicating with the rodless chamber of the hydraulic cylinder. The outlet port is connected to a low-pressure oil circuit directly or via a fourth oil circuit and a pressure regulating valve. A third oil circuit supplying oil to the rodless chamber is connected to the second oil circuit. The cross-sectional area of ​​the second and fourth oil circuits is larger than that of the third oil circuit, and the flow rate of the second and fourth oil circuits is larger than that of the third oil circuit.

[0007] When the pressure in the first oil circuit is high, the quick-release control valve is in the position where the oil inlet and outlet are connected. The first oil circuit supplies oil to the rod chamber, and the rodless chamber returns oil to the low-pressure oil circuit through the second channel and the fourth oil circuit.

[0008] When the pressure in the third oil circuit is high, the quick-release control valve is in a position where the inlet and outlet are not connected. The third oil circuit supplies oil to the rodless chamber, and the rod chamber returns oil through the first channel.

[0009] As a further improvement to the aforementioned cylinder acceleration structure, the rapid oil discharge control valve has two control ports, which are connected to the first oil circuit and the second oil circuit respectively.

[0010] As a further improvement to the aforementioned hydraulic cylinder acceleration structure, the flow rates of the second and fourth hydraulic passages are more than three times that of the third hydraulic passage.

[0011] As a further improvement to the above-mentioned hydraulic cylinder acceleration structure, the oil outlet is connected to the low-pressure oil circuit through the fourth oil circuit and the pressure regulating valve. A one-way valve is set between the second oil circuit and the fourth oil circuit to allow oil to flow from the fourth oil circuit to the second oil circuit. The fourth oil circuit between the one-way valve and the pressure regulating valve is connected to the accumulator.

[0012] As a further improvement to the aforementioned hydraulic cylinder acceleration structure, the pressure regulating valve is a relief valve.

[0013] As a further improvement to the aforementioned hydraulic cylinder acceleration structure, a second check valve is also included, which is located between the second and third hydraulic passages and allows oil to flow from the third hydraulic passage to the second hydraulic passage.

[0014] The beneficial effects of this utility model are:

[0015] When the first oil circuit is connected to high-pressure oil and the third oil circuit is connected to low-pressure oil, the rapid discharge control valve, under the action of the high-pressure oil in the first oil circuit, is in the valve position where the oil inlet and outlet are connected. At this time, the second and fourth oil circuits are connected, and the oil in the rodless chamber of the cylinder is rapidly discharged through the high-flow-rate second oil circuit, the rapid discharge control valve, and the high-flow-rate fourth oil circuit. Because the cross-sectional area of ​​the rod chamber of the cylinder is smaller, the cylinder's action speed is fast. At this time, if the cylinder is unloaded or lightly loaded, it achieves low-pressure (relative to the rodless chamber) rapid advance in the rod chamber.

[0016] When the first oil circuit is filled with low-pressure oil and the third oil circuit is filled with high-pressure oil, the quick-release control valve is in the valve position where the oil inlet and outlet are not connected. At this time, the high-pressure oil in the third oil circuit enters the rodless chamber through the second oil circuit, and the liquid in the rod chamber is discharged through the first oil circuit. The quick-release channel is closed to prevent high-pressure oil from being discharged through the quick-release control valve and the fourth oil circuit without having done any work.

[0017] When equipped with a pressure regulating valve and an accumulator, if the first oil circuit is supplied with high-pressure oil and the third oil circuit with low-pressure oil, the quick-release control valve, under the action of the high-pressure oil in the first oil circuit, connects the second and fourth oil circuits. Oil in the rodless chamber of the cylinder enters the fourth oil circuit through the high-flow channel of the second oil circuit and the quick-release control valve. The pressure regulating valve maintains a certain oil pressure in the fourth oil circuit. The accumulator stores the oil from the rodless chamber and stores its energy. Because the cross-sectional area of ​​the rod chamber of the cylinder is small, the cylinder's action speed is fast. When the first oil circuit is supplied with low-pressure oil and the third oil circuit with high-pressure oil, the quick-release control valve closes the quick-release channel (the inlet and outlet are not connected), preventing high-pressure oil from being discharged from the quick-release control valve and the fourth oil circuit without having performed work. At this time, if the cylinder is unloaded or lightly loaded, the pressure in the rodless chamber is low. If it is lower than the current pressure of the accumulator, the hydraulic oil in the accumulator enters the rodless chamber quickly through the first and second oil circuits of the check valve to achieve the fast advance function. When the cylinder encounters resistance and the pressure in the rodless chamber rises to a level greater than the oil pressure in the accumulator, the first check valve is shut off, and the piston of the cylinder is driven by the pressure oil of the third oil circuit to achieve low-speed, high-power propulsion.

[0018] This structure can significantly improve the operating speed of the hydraulic cylinder, especially when the hydraulic cylinder is moving at low pressure and fast speed. It not only improves the working efficiency but also reduces energy consumption. Moreover, it can automatically realize various functions without the need for control, and has good application value. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the hydraulic cylinder acceleration structure in Example 1;

[0020] Figure 2 This is a schematic diagram of the hydraulic cylinder acceleration structure in Example 2.

[0021] First oil circuit 1, second oil circuit 2, third oil circuit 3, fourth oil circuit 4, quick oil discharge control valve 5, oil cylinder 6, overflow valve 7, accumulator 8, one-way valve 11, one-way valve 212. Detailed Implementation

[0022] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0023] Example 1:

[0024] See Figure 1The hydraulic cylinder acceleration structure features a rapid oil discharge control valve 5, which is a two-position two-way directional valve with two control ports, one inlet, and one outlet. One control port connects to the rod chamber oil circuit (first oil circuit 1) connected to the rod chamber of the hydraulic cylinder 6. The inlet and the other control port are both connected to the rodless chamber oil circuit (second oil circuit 2) connected to the rodless chamber of the hydraulic cylinder 6. The outlet is directly connected to the oil tank via a fourth oil circuit 4. A third oil circuit 3, which supplies oil to the rodless chamber, connects to the second oil circuit 2 via a check valve 12. The cross-sectional area of ​​the second oil circuit 2 and the fourth oil circuit 4 is larger than that of the first oil circuit 1 and the third oil circuit 3, and the flow rate of the second oil circuit 2 and the fourth oil circuit 4 is 4-6 times that of the first or third oil circuit.

[0025] When the pressure in the first oil circuit 1 is high, the quick-release control valve 5 is in the position where the oil inlet and outlet are connected, and the first oil circuit 1 supplies oil to the rod chamber, while the rodless chamber returns oil to the oil tank through the second channel 2 and the fourth oil circuit 4; when the pressure in the third oil circuit 3 is high, the quick-release control valve 5 is in the position where the oil inlet and outlet are not connected, and the third oil circuit 3 supplies oil to the rodless chamber, while the rod chamber returns oil through the first channel 1.

[0026] Example 2:

[0027] See Figure 2 The main difference between Example 2 and Example 1 is that the oil outlet is connected to the oil tank via the fourth oil passage 4 and the overflow valve (pressure stabilizing valve) 7. A one-way valve 11 is positioned between the second oil passage 2 and the fourth oil passage 4. The fourth oil passage between the one-way valve 11 and the pressure stabilizing valve is connected to the accumulator 8. When the pressure in the first oil passage 1 is high, the quick-release control valve 5 is in the position where the inlet and outlet are connected. The first oil passage 1 supplies oil to the rod chamber, and the rodless chamber returns oil through the second channel 2 and the fourth oil passage 3. The overflow valve 7 maintains a certain oil pressure in the fourth oil passage 4, and the accumulator 8 stores the oil from the rodless chamber for energy storage. Because the cross-sectional area of ​​the rod chamber of the cylinder is small, and the flow rates in the second and fourth oil passages are large, the cylinder's operating speed is fast. When the external control supplies low-pressure oil to the first oil circuit 1 and high-pressure oil to the third oil circuit 3, the quick-release control valve 5 closes the quick-release channel (the inlet and outlet are not connected) to prevent high-pressure oil from being discharged from the quick-release control valve 5 and the fourth oil circuit 4 without having performed work. At this time, if the cylinder is unloaded or lightly loaded, the pressure in the rodless chamber is low. If it is lower than the current pressure of the accumulator 8, the hydraulic oil in the accumulator 8 enters the rodless chamber quickly through the check valve 11 and the second oil circuit 2 to achieve the fast-forward function. When the cylinder 6 encounters resistance, causing the pressure in the rodless chamber to rise above the oil pressure in the accumulator 8, the check valve 11 closes, and the piston of the cylinder 6 is driven by the pressure oil in the third oil circuit 3 to achieve low-speed, high-power propulsion.

[0028] In summary, a hydraulic cylinder acceleration structure for use in a large hydraulic cylinder includes a rapid oil discharge control valve. The valve's control end is connected to the rod-side hydraulic circuit of the cylinder (hereinafter referred to as the first hydraulic circuit), the valve's inlet is connected to the rodless-side hydraulic circuit of the cylinder (hereinafter referred to as the second hydraulic circuit), and the valve's outlet hydraulic circuit (hereinafter referred to as the fourth hydraulic circuit) is directly or via a pressure regulating valve connected to the system's low-pressure hydraulic circuit. A check valve is installed between the fourth and second hydraulic circuits, allowing oil to flow from the fourth hydraulic circuit to the second hydraulic circuit. The second and third hydraulic circuits are directly or via a check valve. The second hydraulic circuit is a high-flow-rate circuit, while the third hydraulic circuit is a normal-flow-rate circuit. The flow rates of the second and fourth hydraulic circuits are several times that of the third hydraulic circuit.

[0029] Preferredly, a pressure regulating valve is installed between the fourth oil circuit and the low-pressure oil circuit, an accumulator is installed on the fourth channel, and a check valve is installed between the second and third oil circuits, allowing oil to flow from the third oil circuit to the second oil circuit and then be cut off in the reverse direction.

[0030] a. The principle of the basic structure:

[0031] When the external control supplies high-pressure oil to the first oil circuit and low-pressure oil to the third oil circuit, the rapid oil discharge control valve, under the action of the high-pressure oil in the first oil circuit, connects the second and fourth oil circuits. The oil in the rodless chamber of the cylinder is rapidly discharged through the high-flow channels, namely the second oil circuit, the rapid oil discharge control valve, and the fourth oil circuit. Because the cross-sectional area of ​​the rod chamber of the cylinder is small, the cylinder's action speed is fast.

[0032] When the external control connects the first oil circuit to low-pressure oil and the third oil circuit to high-pressure oil, the quick-release control valve closes the quick-release channel to prevent high-pressure oil from being discharged from the quick-release control valve and the fourth oil circuit without having performed any work.

[0033] b. Structural principle of accumulators:

[0034] When external control supplies high-pressure oil to the first oil circuit and low-pressure oil to the third oil circuit, the quick-release control valve, under the action of the high-pressure oil in the first oil circuit, connects the second and fourth oil circuits. Oil in the rodless chamber of the cylinder flows through the high-flow channel of the second oil circuit, through the quick-release control valve, and into the fourth oil circuit. The pressure regulating valve (relief valve) maintains a certain oil pressure in the fourth oil circuit. The accumulator stores the oil from the rodless chamber for energy storage. Because the cross-sectional area of ​​the rod chamber of the cylinder is small, the cylinder's action speed is fast. When external control supplies low-pressure oil to the first oil circuit and high-pressure oil to the third oil circuit, the quick-release control valve closes the quick-release channel (the inlet and outlet are not connected), preventing high-pressure oil from being discharged from the quick-release control valve and the fourth oil circuit without having performed work. At this time, if the cylinder is unloaded or lightly loaded, the pressure in the rodless chamber is low. If it is lower than the current pressure of the accumulator, the hydraulic oil in the accumulator enters the rodless chamber quickly through the first and second oil circuits of the check valve to achieve the fast advance function. When the cylinder encounters resistance and the pressure in the rodless chamber rises to a level greater than the oil pressure in the accumulator, the first check valve is shut off, and the piston of the cylinder is driven by the pressure oil of the third oil circuit to achieve low-speed, high-power propulsion.

[0035] The advantage of this structure is that it can significantly improve the operating speed of the hydraulic cylinder, especially the low-pressure rapid advance function of the rod chamber, which not only improves the working efficiency but also reduces energy consumption. Moreover, it can automatically realize various functions without control, making it highly valuable.

[0036] The scope of protection of this utility model includes, but is not limited to, the above embodiments. The scope of protection of this utility model is defined by the claims. Any substitutions, modifications, or improvements to this technology that are easily conceived by those skilled in the art shall fall within the scope of protection of this utility model.

Claims

1. An acceleration structure for a hydraulic cylinder, characterized by: It includes a quick-release oil control valve, which is a two-position two-way directional valve with a control port, an oil inlet, and an oil outlet. The control port is connected to the rod chamber oil circuit, i.e., the first oil circuit, which communicates with the rod chamber of the oil cylinder. The oil inlet is connected to the rodless chamber oil circuit, i.e., the second oil circuit, which communicates with the rodless chamber of the oil cylinder. The oil outlet is connected to the low-pressure oil circuit directly or through the fourth oil circuit and a pressure regulating valve. The third oil circuit, which supplies oil to the rodless chamber, is connected to the second oil circuit. The cross-sectional area of ​​the second and fourth oil circuits is larger than that of the third oil circuit, and the flow rate of the second and fourth oil circuits is larger than that of the third oil circuit. When the pressure in the first oil circuit is high, the quick-release control valve is in the position where the oil inlet and outlet are connected. The first oil circuit supplies oil to the rod chamber, and the rodless chamber returns oil to the low-pressure oil circuit through the second channel and the fourth oil circuit. When the pressure in the third oil circuit is high, the quick-release control valve is in a position where the inlet and outlet are not connected. The third oil circuit supplies oil to the rodless chamber, and the rod chamber returns oil through the first channel.

2. The cylinder acceleration structure of claim 1, wherein: The quick-release oil control valve has two control ports, which are connected to the first oil circuit and the second oil circuit respectively.

3. The cylinder acceleration structure of claim 1, wherein: The flow rates of the second and fourth oil lines are more than three times that of the third oil line.

4. The cylinder acceleration structure of claim 1, wherein: The oil outlet is connected to the low-pressure oil circuit via the fourth oil circuit and the pressure regulating valve. A one-way valve is installed between the second and fourth oil circuits to allow oil to flow from the fourth oil circuit to the second oil circuit. The fourth oil circuit between the one-way valve and the pressure regulating valve is connected to the accumulator.

5. The cylinder acceleration structure of claim 4, wherein: The pressure regulating valve is an overflow valve.

6. The cylinder acceleration structure of claim 1, wherein: It also includes a check valve II, which is installed between the second and third oil passages to allow oil to flow from the third oil passage to the second oil passage.

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