Continuous pressurization loop of hydraulic oil and hydraulic machine

Abstract

The utility model discloses a continuous pressurization loop of hydraulic oil and a hydraulic machine. The continuous pressurization loop comprises a control oil port, an output oil port, a return stroke oil port, a main pressurization cylinder, an auxiliary pressurization cylinder, an electromagnetic reversing valve, a low-pressure cartridge valve and a high-pressure cartridge valve. The main pressure cylinder comprises a main low-pressure oil cavity and a main high-pressure oil cavity; the main high-pressure oil cavity is communicated with the output oil port; the auxiliary pressure cylinder comprises an auxiliary low-pressure oil cavity and an auxiliary high-pressure oil cavity; the auxiliary high-pressure oil cavity is communicated with the output oil port; the main pressure cylinder pressurizes the hydraulic oil input into the main high-pressure oil cavity according to the hydraulic oil input into the main low-pressure oil cavity and outputs the hydraulic oil to the output oil port; the auxiliary pressure cylinder pressurizes the hydraulic oil input into the auxiliary high-pressure oil cavity according to the hydraulic oil input into the auxiliary low-pressure oil cavity and outputs the hydraulic oil to the output oil port. The hydraulic machine comprises the continuous pressurization loop. According to the utility model, a hydraulic machine in a continuous pressurizing form can be realized.

Description

Technical Field

[0001] This utility model belongs to the field of hydraulic press technology, specifically relating to a continuous pressurization circuit for hydraulic oil and a hydraulic press. Background Technology

[0002] With rapid economic development, enterprises have increasingly higher requirements for hydraulic presses. In order to reduce production costs and improve production efficiency, it is necessary to continuously increase the working pressure of the main cylinder of the hydraulic press from the normal system pressure to a high pressure of about 100 MPa. Conventional hydraulic presses mainly use oil cylinders to supply high-pressure oil to the main cylinder. However, for large-tonnage hydraulic presses with very large or uncertain boosting strokes, it is necessary to use a continuous boosting method to supply high-pressure oil to the main cylinder.

[0003] Currently, hydraulic presses with continuous boosting mainly use either reciprocating cylinders or parallel motors. However, both methods have some problems: if reciprocating cylinders are used for boosting, there will be large pressure fluctuations and occasional pauses during the boosting process, making it unusable for equipment with high requirements; if parallel motors are used for boosting, although the problem of continuous boosting is solved, the implementation cost is very high and it cannot meet the demand for large flow rates. Utility Model Content

[0004] The purpose of this invention is to provide a continuous hydraulic oil boosting circuit and a hydraulic press, which can continuously and uninterruptedly output high-pressure oil to the hydraulic press.

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

[0006] A continuous booster circuit for hydraulic oil includes an output port, a return port, a main booster cylinder, and a secondary booster cylinder. The return port is used to input hydraulic oil to the main booster cylinder and the secondary booster cylinder.

[0007] The main booster cylinder includes a main low-pressure oil chamber and a main high-pressure oil chamber; the main high-pressure oil chamber is connected to the output oil port.

[0008] The auxiliary booster cylinder includes an auxiliary low-pressure oil chamber and an auxiliary high-pressure oil chamber; the auxiliary high-pressure oil chamber is connected to the output oil port.

[0009] The continuous boost circuit also includes:

[0010] The system includes an electromagnetic directional valve, a low-pressure cartridge valve, and a high-pressure cartridge valve. The low-pressure cartridge valve is used to input hydraulic oil to the main low-pressure oil chamber or the auxiliary low-pressure oil chamber according to the control of the electromagnetic directional valve. The high-pressure cartridge valve is used to input hydraulic oil to the main high-pressure oil chamber and the auxiliary high-pressure oil chamber.

[0011] The main booster cylinder pressurizes the hydraulic oil input to the main high-pressure oil chamber based on the hydraulic oil input to the main low-pressure oil chamber and outputs it to the output port; the auxiliary booster cylinder pressurizes the hydraulic oil input to the auxiliary high-pressure oil chamber based on the hydraulic oil input to the auxiliary low-pressure oil chamber and outputs it to the output port.

[0012] This invention relates to a continuous hydraulic oil boosting circuit. The main booster cylinder boosts the hydraulic oil input to the main high-pressure oil chamber based on the hydraulic oil input to the main low-pressure oil chamber, and the auxiliary booster cylinder boosts the hydraulic oil input to the auxiliary high-pressure oil chamber based on the hydraulic oil input to the auxiliary low-pressure oil chamber. The low-pressure cartridge valve input is switched through a solenoid directional valve, and the oil pressure of the two cylinders is reset through the return port, so that the main booster cylinder and the auxiliary booster cylinder can continuously and uninterruptedly boost and output hydraulic oil alternately.

[0013] Preferably, the continuous pressurization circuit further includes a control port and a dual-pass port; an even number of low-pressure cartridge valves are disposed between the control port and the dual-pass port, and each low-pressure cartridge valve is interconnected with its adjacent low-pressure cartridge valve; the even number of low-pressure cartridge valves are paired, and each pair of low-pressure cartridge valves is provided with a node connecting to the main low-pressure oil chamber or the secondary low-pressure oil chamber.

[0014] This utility model discloses a continuous pressure boosting circuit for hydraulic oil. By setting an even number of interconnected low-pressure cartridge valves, the input hydraulic oil can be output to the main low-pressure oil chamber and the auxiliary low-pressure oil chamber, thereby enabling the main boosting cylinder and the auxiliary boosting cylinder to obtain boosting power and ensuring the high-pressure oil output of the main high-pressure oil chamber and the auxiliary high-pressure oil chamber.

[0015] Preferably, the electromagnetic directional valve includes a first electromagnetic directional valve; the even number of low-pressure cartridge valves includes a first pair of low-pressure cartridge valves; one end of the first pair of low-pressure cartridge valves is connected to the control port and forms a first oil passage therebetween; the other end of the first pair of low-pressure cartridge valves is connected to the double-pass port and forms a second oil passage therebetween; the first electromagnetic directional valve is disposed between the first oil passage and the second oil passage.

[0016] This utility model discloses a continuous pressure boosting circuit for hydraulic oil. By setting a first electromagnetic directional valve between two oil circuits, it is equivalent to setting a switch between the two oil circuits. The two oil circuits can only operate when the first electromagnetic directional valve is opened.

[0017] Preferably, the continuous boosting circuit further includes an input oil port; the electromagnetic directional valve further includes a second electromagnetic directional valve; the even number of low-pressure cartridge valves includes a second pair of low-pressure cartridge valves; one end of the second pair of low-pressure cartridge valves is connected to the control oil port and forms a third oil circuit therebetween; the other end of the second pair of low-pressure cartridge valves is connected to the double-pass oil port and forms a fourth oil circuit therebetween; the second electromagnetic directional valve is disposed between the third oil circuit and the fourth oil circuit; the second pair of low-pressure cartridge valves and the first pair of low-pressure cartridge valves are interconnected and the input oil port is disposed between them.

[0018] This utility model discloses a continuous hydraulic oil boosting circuit. By setting a second solenoid directional valve between two oil circuits, it is equivalent to setting a switch between the two oil circuits. When the second solenoid directional valve is opened, the two oil circuits can operate. Combined with the first solenoid directional valve, the oil output can be switched, ensuring that the main boosting cylinder and the auxiliary boosting cylinder alternately boost the output and preventing cylinder chaos.

[0019] Preferably, the high-pressure cartridge valve includes a first high-pressure cartridge valve, a second high-pressure cartridge valve, a third high-pressure cartridge valve, and a fourth high-pressure cartridge valve; the first high-pressure cartridge valve is disposed between the secondary high-pressure oil chamber and the double-pass oil port; the second high-pressure cartridge valve is disposed between the main high-pressure oil chamber and the double-pass oil port; the third high-pressure cartridge valve is disposed between the secondary high-pressure oil chamber and the output oil port; and the fourth high-pressure cartridge valve is disposed between the main high-pressure oil chamber and the output oil port.

[0020] This utility model discloses a continuous pressurization circuit for hydraulic oil. By setting a first high-pressure cartridge valve and a second high-pressure cartridge valve, the oil supply to the two high-pressure oil chambers is ensured. By setting a third high-pressure cartridge valve and a fourth high-pressure cartridge valve, the pressurized high-pressure hydraulic oil is stored and finally output from the output port.

[0021] Preferably, the continuous boosting circuit further includes a first proportional valve and a second proportional valve; the first proportional valve is disposed between the first working port of the third high-pressure cartridge valve and the main high-pressure oil chamber; the second proportional valve is disposed between the first working port of the fourth high-pressure cartridge valve and the auxiliary high-pressure oil chamber.

[0022] This utility model discloses a continuous boosting circuit for hydraulic oil. By setting proportional valves between the two output oil lines, it is equivalent to setting switches between the two output oil lines. These valves, in conjunction with two solenoid directional valves, ensure that only one boosting cylinder outputs high-pressure oil at a time, thus preventing cylinder malfunctions.

[0023] Preferably, the main booster cylinder includes a first piston; the first piston divides the interior of the main booster cylinder into a main low-pressure oil chamber and a main high-pressure oil chamber; the first piston includes a main control oil chamber;

[0024] The auxiliary booster cylinder includes a second piston; the second piston divides the interior of the auxiliary booster cylinder into an auxiliary low-pressure oil chamber and an auxiliary high-pressure oil chamber; the second piston also includes an auxiliary control oil chamber.

[0025] The return oil port is connected to the main control oil chamber and the secondary control oil chamber.

[0026] This utility model discloses a continuous pressure boosting circuit for hydraulic oil. By setting a first piston and a second piston, when hydraulic oil is input into the two low-pressure oil chambers, the two pistons can be pushed to move, thereby pushing the hydraulic oil in the two high-pressure oil chambers to increase its pressure and output it.

[0027] Preferably, the continuous boosting circuit further includes a first displacement sensor; the second piston reciprocates within the auxiliary boosting cylinder, causing the capacity of the auxiliary high-pressure oil chamber to decrease and the capacity of the auxiliary low-pressure oil chamber to increase, or causing the capacity of the auxiliary high-pressure oil chamber to increase and the capacity of the auxiliary low-pressure oil chamber to decrease; the first displacement sensor detects the change in the capacity of the auxiliary high-pressure oil chamber.

[0028] This invention relates to a continuous pressure boosting circuit for hydraulic oil. A first displacement sensor detects changes in the capacity of the secondary high-pressure oil chamber. When the capacity of the secondary high-pressure oil chamber increases to a set value, a first proportional valve opens to allow the secondary boosting cylinder to output high-pressure oil.

[0029] Preferably, the continuous boosting circuit further includes a second displacement sensor; the first piston reciprocates within the main boosting cylinder, causing the capacity of the main high-pressure oil chamber to decrease and the capacity of the main low-pressure oil chamber to increase, or causing the capacity of the main high-pressure oil chamber to increase and the capacity of the main low-pressure oil chamber to decrease; the second displacement sensor detects the change in the capacity of the main high-pressure oil chamber.

[0030] This invention relates to a continuous hydraulic oil boosting circuit. A second displacement sensor detects changes in the capacity of the main high-pressure oil chamber. When the capacity of the main high-pressure oil chamber decreases to a set value, the second solenoid directional valve closes while the first solenoid directional valve opens, changing the output of the low-pressure cartridge valve from the main booster cylinder to the auxiliary booster cylinder. This ensures that the position of the auxiliary booster cylinder changes. Simultaneously, hydraulic oil is input into the main control oil chamber through the return port, causing the main booster cylinder to return quickly.

[0031] This utility model also provides a hydraulic press, including the above-mentioned continuous pressurization circuit for hydraulic oil; the hydraulic press also includes a main cylinder; the main cylinder and the output oil port are connected.

[0032] This utility model discloses a hydraulic press that can achieve a continuous pressure boosting type by connecting the output oil port of the main cylinder and the continuous pressure boosting circuit.

[0033] Beneficial effects:

[0034] This invention relates to a continuous pressure boosting circuit for hydraulic oil and a hydraulic press. In the continuous pressure boosting circuit, the main boosting cylinder boosts the hydraulic oil input to the main high-pressure oil chamber based on the hydraulic oil input to the main low-pressure oil chamber, and the auxiliary boosting cylinder boosts the hydraulic oil input to the auxiliary high-pressure oil chamber based on the hydraulic oil input to the auxiliary low-pressure oil chamber. The low-pressure cartridge valve input is switched through a solenoid directional valve, and the oil pressure of the two cylinders is reset through the return port, so that the main boosting cylinder and the auxiliary boosting cylinder can continuously and uninterruptedly alternately boost the hydraulic oil and output it to the hydraulic press. Attached Figure Description

[0035] Figure 1 The diagram shown is a schematic diagram of a continuous pressure boosting circuit for hydraulic oil according to an embodiment.

[0036] Figure 2 The diagram shown is a structural schematic of the main booster cylinder in an embodiment.

[0037] Figure 3 The diagram shown is a structural schematic of the auxiliary booster cylinder in an embodiment.

[0038] Figure 4 The diagram shows the oil port of the low-pressure cartridge valve and the high-pressure cartridge valve in the embodiment.

[0039] Figure Labels

[0040] 1-1. First low-pressure cartridge valve; 1-2. Second low-pressure cartridge valve; 1-3. Third low-pressure cartridge valve; 1-4. Fourth low-pressure cartridge valve; 2-1. First solenoid directional valve; 2-2. Second solenoid directional valve; 3-1. Control port; 3-2. Output port; 3-3. Return port; 3-4. Two-way port; 3-5. Input port; 4. First high-pressure cartridge valve; 5. Second high-pressure cartridge valve; 6. First proportional valve; 7. Second proportional valve; 8. Third high-pressure cartridge valve; 9. 10. High-pressure cartridge valve; 10. Main booster cylinder; 101. Main control oil chamber; 102. Main high-pressure oil chamber; 103. Main low-pressure oil chamber; 11. Second displacement sensor; 12. Auxiliary booster cylinder; 121. Auxiliary control oil chamber; 122. Auxiliary high-pressure oil chamber; 123. Auxiliary low-pressure oil chamber; 13. First displacement sensor; 14. Safety valve; 15. Check valve; 16. Control port; 17. Second working port; 18. First working port; L1. Length of main high-pressure chamber; L2. Length of auxiliary high-pressure chamber. Detailed Implementation

[0041] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the specific implementation methods of this utility model will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0042] The technical solution of this utility model will be described in detail below with specific embodiments.

[0043] Example 1

[0044] like Figures 1-4 As shown, a continuous pressurization circuit for hydraulic oil in this embodiment includes:

[0045] Inlet ports 3-5 are used to input hydraulic oil to the low-pressure cartridge valve;

[0046] Control port 3-1 is used to input hydraulic oil to the low-pressure cartridge valve and the high-pressure cartridge valve;

[0047] Oil output port 3-2;

[0048] Return port 3-3 is used to input hydraulic oil to the main booster cylinder 10 and the auxiliary booster cylinder 12;

[0049] The main booster cylinder 10 includes a main low-pressure oil chamber 103 and a main high-pressure oil chamber 102; the main high-pressure oil chamber 102 is connected to the output oil port 3-2.

[0050] The auxiliary booster cylinder 12 includes an auxiliary low-pressure oil chamber 123 and an auxiliary high-pressure oil chamber 122; the auxiliary high-pressure oil chamber 122 is connected to the output oil port 3-2.

[0051] Solenoid directional valves are used to control low-pressure cartridge valves;

[0052] A low-pressure cartridge valve is used to input hydraulic oil to the main low-pressure oil chamber 103 or the auxiliary low-pressure oil chamber 123 according to the control of the solenoid directional valve.

[0053] A high-pressure cartridge valve is used to input hydraulic oil to the main high-pressure oil chamber 102 and the auxiliary high-pressure oil chamber 122;

[0054] The main booster cylinder 10 boosts the hydraulic oil input to the main high-pressure oil chamber 102 based on the hydraulic oil input to the main low-pressure oil chamber 103 and outputs it to the output port 3-2; the auxiliary booster cylinder 12 boosts the hydraulic oil input to the auxiliary high-pressure oil chamber 122 based on the hydraulic oil input to the auxiliary low-pressure oil chamber 123 and outputs it to the output port 3-2.

[0055] Preferably, the continuous pressurization circuit further includes a dual-pass oil port 3-4; the low-pressure cartridge valves include a first low-pressure cartridge valve 1-1, a second low-pressure cartridge valve 1-2, a third low-pressure cartridge valve 1-3, and a fourth low-pressure cartridge valve 1-4; each of the first low-pressure cartridge valve 1-1, the second low-pressure cartridge valve 1-2, the third low-pressure cartridge valve 1-3, and the fourth low-pressure cartridge valve 1-4 includes a control oil port, a first working oil port, and a second working oil port; the control oil port 16 and the first working oil port 18 of the first low-pressure cartridge valve 1-1 are respectively connected to the dual-pass oil port 3-4; the second working oil port 17 of the first low-pressure cartridge valve 1-1 is connected to the second working oil port of the second low-pressure cartridge valve 1-2, and a connection is provided between them. A node connected to the main low-pressure oil chamber 103; the first working port of the second low-pressure cartridge valve 1-2 and the first working port of the third low-pressure cartridge valve 1-3 are connected, and hydraulic oil is input to the intermediate node between them through the input port 3-5; the control port of the second low-pressure cartridge valve 1-2 and the control port 3-1 are connected; the second working port of the third low-pressure cartridge valve 1-3 and the second working port of the fourth low-pressure cartridge valve 1-4 are connected, and a node connected to the auxiliary low-pressure oil chamber 123 is provided between them; the control port of the third low-pressure cartridge valve 1-3 and the control port 3-1 are connected; the control port and the first working port of the fourth low-pressure cartridge valve 1-4 are respectively connected to the double-pass port 3-4.

[0056] Preferably, the electromagnetic directional valve includes a first electromagnetic directional valve 2-1; the first electromagnetic directional valve 2-1 controls the connection between the control port 3-1 and the control port of the second low-pressure cartridge valve 1-2; the first electromagnetic directional valve 2-1 also controls the connection between the control port of the first low-pressure cartridge valve 1-1 and the double-pass port 3-4.

[0057] Preferably, the electromagnetic directional valve further includes a second electromagnetic directional valve 2-2; the second electromagnetic directional valve 2-2 controls the connection between the control port 3-1 and the control port of the third low-pressure cartridge valve 1-3; the second electromagnetic directional valve 2-2 also controls the connection between the control port of the fourth low-pressure cartridge valve 1-4 and the double-pass port 3-4.

[0058] Preferably, the high-pressure cartridge valve includes a first high-pressure cartridge valve 4, a second high-pressure cartridge valve 5, a third high-pressure cartridge valve 8, and a fourth high-pressure cartridge valve 9; each of the first high-pressure cartridge valve 4, the second high-pressure cartridge valve 5, the third high-pressure cartridge valve 8, and the fourth high-pressure cartridge valve 9 also includes a first working port and a second working port; the first working port of the first high-pressure cartridge valve 4 is connected to the double-pass port 3-4; the second working port of the first high-pressure cartridge valve 4 is connected to the main high-pressure oil chamber 102; the first working port of the second high-pressure cartridge valve 5 is connected to the double-pass port 3-4; the second working port of the second high-pressure cartridge valve 5 is connected to the auxiliary high-pressure oil chamber 122; the first working port of the third high-pressure cartridge valve 8 is connected to the main high-pressure oil chamber 102; the second working port of the third high-pressure cartridge valve 8 is connected to the output port 3-2; the first working port of the fourth high-pressure cartridge valve 9 is connected to the auxiliary high-pressure oil chamber 122; and the second working port of the fourth high-pressure cartridge valve 9 is connected to the output port 3-2.

[0059] Preferably, the continuous boosting circuit further includes a first proportional valve 6 and a second proportional valve 7; the first proportional valve 6 is disposed between the first working port of the third high-pressure cartridge valve 8 and the main high-pressure oil chamber 102; the second proportional valve 7 is disposed between the first working port of the fourth high-pressure cartridge valve 9 and the auxiliary high-pressure oil chamber 122.

[0060] Preferably, the main booster cylinder 10 includes a first piston; the first piston divides the interior of the main booster cylinder 10 into a main low-pressure oil chamber 103 and a main high-pressure oil chamber 102; the first piston includes a main control oil chamber 101;

[0061] The auxiliary booster cylinder 12 includes a second piston; the second piston divides the interior of the auxiliary booster cylinder 12 into a secondary low-pressure oil chamber 123 and a secondary high-pressure oil chamber 122; the second piston includes a secondary control oil chamber 121.

[0062] The return oil port 3-3 is connected to the main control oil chamber 101 and the auxiliary control oil chamber 121.

[0063] Preferably, the continuous boosting circuit further includes a second displacement sensor 11; the first piston reciprocates within the main boosting cylinder 10, causing the capacity of the main high-pressure oil chamber 102 to decrease and the capacity of the main low-pressure oil chamber 103 to increase, or causing the capacity of the main high-pressure oil chamber 102 to increase and the capacity of the main low-pressure oil chamber 103 to decrease; the second displacement sensor 11 detects the change in the capacity of the main high-pressure oil chamber 102.

[0064] Preferably, the continuous boosting circuit further includes a first displacement sensor 13; the second piston reciprocates within the auxiliary boosting cylinder 12, causing the capacity of the auxiliary high-pressure oil chamber 122 to decrease and the capacity of the auxiliary low-pressure oil chamber 123 to increase, or causing the capacity of the auxiliary high-pressure oil chamber 122 to increase and the capacity of the auxiliary low-pressure oil chamber 123 to decrease; the first displacement sensor 13 detects the change in the capacity of the auxiliary high-pressure oil chamber 122.

[0065] In this embodiment, a continuous hydraulic oil boosting circuit is provided. The main boosting cylinder 10 boosts the hydraulic oil input to the main high-pressure oil chamber 102 based on the hydraulic oil input to the main low-pressure oil chamber 103. The auxiliary boosting cylinder 12 boosts the hydraulic oil input to the auxiliary high-pressure oil chamber 122 based on the hydraulic oil input to the auxiliary low-pressure oil chamber 123. The input of the low-pressure cartridge valve is switched through the solenoid reversing valve, and the oil pressure of the two cylinders is reset through the return port 3-3, so that the main boosting cylinder 10 and the auxiliary boosting cylinder 12 can continuously and uninterruptedly boost and output hydraulic oil alternately.

[0066] This embodiment provides a continuous hydraulic oil boosting circuit. By setting four interconnected low-pressure cartridge valves, the input hydraulic oil can be output to the main low-pressure oil chamber 103 and the auxiliary low-pressure oil chamber 123. As a result, the main boosting cylinder 10 and the auxiliary boosting cylinder 12 can obtain boosting power, ensuring the high-pressure oil output of the main high-pressure oil chamber 102 and the auxiliary high-pressure oil chamber 122.

[0067] In this embodiment, a continuous pressure boosting circuit for hydraulic oil is provided. By setting a first solenoid directional valve 2-1 between the two input oil lines, it is equivalent to setting a switch between the two input oil lines. The two oil lines can only operate when the first solenoid directional valve 2-1 is opened.

[0068] In this embodiment, a continuous hydraulic oil boosting circuit is provided. By setting a second solenoid directional valve 2-2 between the two input oil lines, it is equivalent to setting a switch between the two input oil lines. When the second solenoid directional valve 2-2 is opened, the two oil lines can operate. Combined with the first solenoid directional valve 2-1, the oil output can be switched, ensuring that the main boosting cylinder 10 and the auxiliary boosting cylinder 12 alternately boost the output and preventing cylinder chaos.

[0069] This embodiment provides a continuous hydraulic oil boosting circuit. By setting a first high-pressure cartridge valve 4 and a second high-pressure cartridge valve 5, the oil supply to the two high-pressure oil chambers is ensured. By setting a third high-pressure cartridge valve 8 and a fourth high-pressure cartridge valve 9, the boosted high-pressure hydraulic oil is stored and finally output from the output port 3-2.

[0070] This embodiment provides a continuous hydraulic oil boosting circuit. By installing proportional valves between the two output oil lines, it is equivalent to installing switches between the two output oil lines. These valves, in conjunction with two solenoid directional valves, ensure that only one boosting cylinder outputs high-pressure oil at a time, preventing cylinder malfunctions.

[0071] This embodiment provides a continuous hydraulic oil boosting circuit. By setting a first piston and a second piston, when hydraulic oil is input into the two low-pressure oil chambers, the two pistons can be pushed to move, thereby pushing the hydraulic oil in the two high-pressure oil chambers to boost its pressure and output it.

[0072] In this embodiment, a continuous pressurization circuit for hydraulic oil uses a second displacement sensor 11 to detect changes in the capacity of the main high-pressure oil chamber 102.

[0073] Furthermore, when the second reversing solenoid valve is open and the first reversing solenoid valve is closed, and the second proportional valve 7 is open and the first proportional valve 6 is closed, the low-pressure cartridge valve inputs hydraulic oil into the main low-pressure oil chamber 103, causing the first piston to move upward. The hydraulic oil in the main high-pressure oil chamber 102 is pressurized and output to the fourth high-pressure cartridge valve 9, and finally outputs high-pressure hydraulic oil from the output port 3-2. During the process of outputting hydraulic oil from the main high-pressure oil chamber 102, when the second displacement sensor 11 detects that the capacity of the main high-pressure oil chamber 102 has decreased to the set value, the second solenoid reversing valve 2-2 is closed and the first solenoid reversing valve 2-1 is opened, and the second proportional valve 7 is closed and the first proportional valve 6 is opened, changing the output of the low-pressure cartridge valve from the main booster cylinder 10 to the auxiliary booster cylinder 12. At the same time, the return port 3-3 inputs hydraulic oil into the main control oil chamber 101, causing the first piston to move downward, thereby causing the main booster cylinder 10 to return quickly.

[0074] Furthermore, after the second proportional valve 7 is closed, the second high-pressure socket valve inputs hydraulic oil to the main high-pressure oil chamber 102, filling the main high-pressure oil chamber 102 with hydraulic oil. During the return stroke of the main booster cylinder 10, the first piston pushes the hydraulic oil in the main low-pressure oil chamber 103 back, causing it to flow back to the fourth low-pressure cartridge valve 1-4, and then flow out from the first working port of the fourth low-pressure cartridge valve 1-4, finally entering the double-pass port 3-4.

[0075] Specifically, when the second reversing solenoid valve is open and the first reversing solenoid valve is closed, the hydraulic oil input through control port 3-1 passes through the second reversing solenoid valve and enters through the control port of the third low-pressure cartridge valve 1-3, then exits through the second working port of the third low-pressure cartridge valve 1-3 and enters the main low-pressure oil chamber 103. Simultaneously, hydraulic oil is also input through return port 3-3, entering through the first working port of the fourth low-pressure cartridge valve 1-4, then exiting through the second working port of the fourth low-pressure cartridge valve 1-4 and entering the main low-pressure oil chamber 103. A portion of the hydraulic oil flows out from the control port of the fourth low-pressure cartridge valve 1-4 to return port 3-3, thereby controlling the hydraulic oil output rate.

[0076] In this embodiment, a continuous pressurization circuit for hydraulic oil detects the capacity change of the secondary high-pressure oil chamber 122 through a first displacement sensor 13.

[0077] Furthermore, when the second solenoid directional valve 2-2 is closed, the first solenoid directional valve 2-1 is open, and the second proportional valve 7 is closed and the first proportional valve 6 is open, the low-pressure cartridge valve inputs hydraulic oil into the secondary low-pressure oil chamber 123, causing the second piston to move upward. The hydraulic oil in the secondary high-pressure oil chamber 122 is pressurized and output to the third high-pressure cartridge valve 8, and finally outputs high-pressure hydraulic oil from the output port 3-2. During the process of outputting hydraulic oil from the secondary high-pressure oil chamber 122, when the first displacement sensor 13 detects that the capacity of the secondary high-pressure oil chamber 122 has decreased to the set value, the second solenoid directional valve 2-2 is opened, the first solenoid directional valve 2-1 is closed, and the second proportional valve 7 is opened and the first proportional valve 6 is closed, changing the output of the low-pressure cartridge valve from the secondary booster cylinder 12 to the main booster cylinder 10. At the same time, the return port 3-3 inputs hydraulic oil into the secondary control oil chamber 121, causing the second piston to move downward, thereby causing the secondary booster cylinder 12 to return quickly.

[0078] Furthermore, after the first proportional valve 6 is closed, the first high-pressure socket valve inputs hydraulic oil to the secondary high-pressure oil chamber 122, filling the secondary high-pressure oil chamber 122 with hydraulic oil. During the return stroke of the secondary booster cylinder 12, the second piston pushes the hydraulic oil in the secondary low-pressure oil chamber 123 back, causing it to flow back to the first low-pressure cartridge valve 1-1, and then flow out from the first working oil port of the first low-pressure cartridge valve 1-1 and finally enter the double-stroke oil port 3-4.

[0079] Specifically, when the first reversing solenoid valve is open and the second reversing solenoid valve is closed, the hydraulic oil input through control port 3-1 passes through the first reversing solenoid valve and enters through the control port of the second low-pressure cartridge valve 1-2, then exits through the second working port of the second low-pressure cartridge valve 1-2 and enters the secondary low-pressure oil chamber 123. Simultaneously, hydraulic oil is also input through return port 3-3, entering through the first working port 18 of the first low-pressure cartridge valve 1-1, then exiting through the second working port 17 of the first low-pressure cartridge valve 1-1 and entering the secondary low-pressure oil chamber 123. Meanwhile, a portion of the hydraulic oil flows out from control port 16 of the first low-pressure cartridge valve 1-1 to return port 3-3, thereby controlling the hydraulic oil output rate.

[0080] Specifically, in this embodiment, the volume of the main booster cylinder 10 is larger than the volume of the auxiliary booster cylinder 12, and the volume of the first piston is also larger than the volume of the second piston, ensuring that there is a pressure difference between the two booster cylinders.

[0081] Furthermore, in this embodiment, the auxiliary booster cylinder 12 is closer to the return port 3-3 than the main booster cylinder 10. The hydraulic oil flowing out of the return port 3-3 will first pass through the check valve 15 and the safety valve 14. When the first piston or the second piston moves upward, the hydraulic oil in the two control oil chambers will first pass through the safety valve 14 and then through the check valve 15, and finally return to the return port 3-3. The position design of the check valve 15 and the safety valve 14, as well as the position design of the two booster cylinders, can ensure the normal operation of this process.

[0082] Specifically, after the first working port of the second low-pressure cartridge valve 1-2 and the first working port of the third low-pressure cartridge valve 1-3 are connected, the node in the middle of their connection forms a system pressure oil node. The hydraulic oil pressure at this node needs to be adjusted to match the set system pressure. The set values ​​referenced by the first displacement sensor 13 and the second displacement sensor 11 need to be strictly calculated and set to ensure that the hydraulic oil output from the output port 3-2 reaches the 1000 MPa required by the hydraulic press.

[0083] Furthermore, based on the internal structural design of the main booster cylinder 10, the capacity change of the main low-pressure oil chamber 103 is reflected in its width, while the capacity change of the main high-pressure oil chamber 102 is reflected in its length. Therefore, the second displacement sensor 11 is vertically placed on the side of the main high-pressure oil chamber 102 and detects the change in the length L1 of the main high-pressure oil chamber 102. Similarly, the first displacement sensor 13 detects the change in the length L2 of the auxiliary high-pressure oil chamber 122.

[0084] In another embodiment, the output hydraulic oil time of the auxiliary booster cylinder 12 only needs to cover the time required for the main booster cylinder 10 to switch and return. The auxiliary booster cylinder 12 and the main booster cylinder 10 are the same except for their stroke, in order to ensure that the pressure and flow fluctuations after boosting are as small as possible. Both the auxiliary booster cylinder 12 and the main booster cylinder 10 are equipped with proportional valves and displacement sensors. The purpose is to ensure the switching sequence of the actions of the auxiliary booster cylinder 12 and the main booster cylinder 10 by adjusting the valve opening and position feedback, so as to prevent cylinder chaos. The design of the return oil port 3-3 can enable the auxiliary booster cylinder 12 or the main booster cylinder to return quickly with only a small amount of pressure oil, which greatly reduces energy consumption.

[0085] Example 2

[0086] This utility model also provides a hydraulic press, including the above-mentioned continuous pressurization circuit for hydraulic oil; the hydraulic press also includes a main cylinder; the main cylinder and the output oil port 3-2 are connected.

[0087] This utility model discloses a hydraulic press that can achieve a continuous pressure boosting type by connecting the main cylinder and the output oil port 3-2 of the continuous pressure boosting circuit.

[0088] The continuous pressurization circuit for hydraulic oil and the embodiment of the hydraulic press provided by this utility model have been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. The description of the embodiments above is only for the purpose of helping to understand the core idea of ​​this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A continuous boosting circuit for hydraulic oil, comprising an output port (3-2), a return port (3-3), a main boosting cylinder (10), and a secondary boosting cylinder (12), wherein the return port (3-3) is used to input hydraulic oil to the main boosting cylinder (10) and the secondary boosting cylinder (12), characterized in that, The main booster cylinder (10) includes a main low-pressure oil chamber (103) and a main high-pressure oil chamber (102); the main high-pressure oil chamber (102) and the output oil port (3-2) are connected; The auxiliary booster cylinder (12) includes an auxiliary low-pressure oil chamber (123) and an auxiliary high-pressure oil chamber (122); the auxiliary high-pressure oil chamber (122) is connected to the output oil port (3-2); The continuous boost circuit also includes: The system includes a solenoid directional valve, a low-pressure cartridge valve, and a high-pressure cartridge valve. The low-pressure cartridge valve is used to input hydraulic oil to the main low-pressure oil chamber (103) or the auxiliary low-pressure oil chamber (123) according to the control of the solenoid directional valve. The high-pressure cartridge valve is used to input hydraulic oil to the main high-pressure oil chamber (102) and the auxiliary high-pressure oil chamber (122).

2. The continuous boosting circuit according to claim 1, characterized in that, The continuous pressurization circuit also includes a control port (3-1) and a dual-pass port (3-4); an even number of low-pressure cartridge valves are disposed between the control port (3-1) and the dual-pass port (3-4), and each low-pressure cartridge valve is interconnected with its adjacent low-pressure cartridge valve; the even number of low-pressure cartridge valves are paired, and each pair of low-pressure cartridge valves is provided with a node that is connected to the main low-pressure oil chamber (103) or the secondary low-pressure oil chamber (123).

3. The continuous boosting circuit according to claim 2, characterized in that, The electromagnetic directional valve includes a first electromagnetic directional valve (2-1); the even number of low-pressure cartridge valves includes a first pair of low-pressure cartridge valves; one end of the first pair of low-pressure cartridge valves is connected to the control port (3-1) and forms a first oil circuit therebetween; the other end of the first pair of low-pressure cartridge valves is connected to the double-pass port (3-4) and forms a second oil circuit therebetween; the first electromagnetic directional valve (2-1) is disposed between the first oil circuit and the second oil circuit.

4. The continuous boosting circuit according to claim 3, characterized in that, The continuous boosting circuit further includes an input port (3-5); the electromagnetic directional valve further includes a second electromagnetic directional valve (2-2); the even number of low-pressure cartridge valves includes a second pair of low-pressure cartridge valves; one end of the second pair of low-pressure cartridge valves is connected to the control port (3-1) and forms a third oil circuit therebetween; the other end of the second pair of low-pressure cartridge valves is connected to the double-pass port (3-4) and forms a fourth oil circuit therebetween; the second electromagnetic directional valve is disposed between the third oil circuit and the fourth oil circuit; the second pair of low-pressure cartridge valves and the first pair of low-pressure cartridge valves are interconnected and the input port (3-5) is disposed between them.

5. The continuous boosting circuit according to claim 2, characterized in that, The high-pressure cartridge valve includes a first high-pressure cartridge valve (4), a second high-pressure cartridge valve (5), a third high-pressure cartridge valve (8), and a fourth high-pressure cartridge valve (9); the first high-pressure cartridge valve (4) is disposed between the secondary high-pressure oil chamber (122) and the double-pass oil port (3-4); the second high-pressure cartridge valve (5) is disposed between the main high-pressure oil chamber (102) and the double-pass oil port (3-4); the third high-pressure cartridge valve (8) is disposed between the secondary high-pressure oil chamber (122) and the output oil port (3-2); and the fourth high-pressure cartridge valve (9) is disposed between the main high-pressure oil chamber (102) and the output oil port (3-2).

6. The continuous boosting circuit according to claim 5, characterized in that, The continuous boosting circuit also includes a first proportional valve (6) and a second proportional valve (7); the first proportional valve (6) is disposed between the third high-pressure cartridge valve (8) and the main high-pressure oil chamber (102); the second proportional valve (7) is disposed between the fourth high-pressure cartridge valve (9) and the auxiliary high-pressure oil chamber (122).

7. The continuous boosting circuit according to any one of claims 1 to 6, characterized in that, The main booster cylinder (10) includes a first piston; the first piston divides the interior of the main booster cylinder (10) into the main low-pressure oil chamber (103) and the main high-pressure oil chamber (102); the first piston includes a main control oil chamber (101); The auxiliary booster cylinder (12) includes a second piston; the second piston divides the interior of the auxiliary booster cylinder (12) into the auxiliary high-pressure oil chamber (123) and the auxiliary high-pressure oil chamber (122); the second piston includes an auxiliary control oil chamber (121); The return oil port (3-3) is connected to the main control oil chamber (101) and the secondary control oil chamber (121).

8. The continuous boosting circuit according to claim 7, characterized in that, The continuous boosting circuit also includes a first displacement sensor (13); the second piston moves back and forth in the auxiliary boosting cylinder (12) to adjust the capacity of the auxiliary high-pressure oil chamber (122) and the auxiliary low-pressure oil chamber (123); the first displacement sensor (13) detects the capacity change of the auxiliary high-pressure oil chamber (122).

9. The continuous boosting circuit according to claim 7, characterized in that, The continuous boosting circuit also includes a second displacement sensor (11); the first piston moves back and forth in the main boosting cylinder (10) to adjust the capacity of the secondary high-pressure oil chamber (122) and the secondary low-pressure oil chamber (123); the second displacement sensor (11) detects the capacity change of the main high-pressure oil chamber (102).

10. A hydraulic press, characterized in that, The hydraulic press includes a continuous pressurization circuit for hydraulic oil as described in any one of claims 1 to 9; the hydraulic press also includes a main cylinder; the main cylinder and the output port (3-2) are connected.

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