Hydraulic station

Abstract

The invention discloses a hydraulic station which comprises an air cylinder, a reversing trigger device capable of sending out a signal that an air cylinder piston of the air cylinder moves in place, a reversing valve for switching air intake and air exhaust of two air cylinder cavities of the air cylinder according to the signal of the reversing trigger device, and an oil cylinder linked with the air cylinder, the oil cylinder can extract hydraulic oil from the oil tank under driving of the air cylinder and supply the hydraulic oil to the executing mechanism through the first oil supply pipeline. The hydraulic oil pump extracts hydraulic oil from the oil tank and supplies the hydraulic oil to the executing mechanism through a second oil supply pipeline, and the pressure detection device is used for detecting the air inlet pressure of the reversing valve or the oil pressure of the oil outlet of the oil cylinder. The first oil supply pipeline is provided with a first one-way valve to prevent hydraulic oil in the second oil supply pipeline from entering the first oil supply pipeline. The hydraulic oil pump is started when the pressure detection device detects that the air inlet pressure or the oil pressure is reduced to a first set value. According to the hydraulic station, the pressure detection device and the hydraulic oil pump are arranged, the hydraulic oil pump is adopted for oil supply when oil supply of the oil cylinder stops, and therefore continuous oil supply is achieved.

Description

Technical Field

[0001] The present invention relates to the field of hydraulic stations, and in particular to a hydraulic station. Background Art

[0002] A hydraulic station is a hydraulic device that supplies oil according to the required flow direction, pressure, and flow rate, and is usually used in conjunction with machine tools that require hydraulic drive actuators.

[0003] Refer to Figure 1 , which is a schematic structural diagram of a hydraulic station provided in the prior art. As shown in the figure, the hydraulic station includes: a linked air cylinder 1' and an oil cylinder 2'; wherein, on both sides of the cylinder end caps of the air cylinder 1', a first commutation trigger device 3' and a second commutation trigger device 4' are respectively provided. At the same time, the air cylinder 1' is connected to a pneumatic commutation valve 5', and the air source is respectively connected to the intake ports of the first commutation trigger device 3', the second commutation trigger device 4', and the pneumatic commutation valve 5'; the A' working port of the pneumatic commutation valve 5' is connected to one side of the air cylinder 1', and the B' working port of the pneumatic commutation valve 5' is connected to the other side of the air cylinder 1'; the first commutation trigger device 3' is connected to the pneumatic commutation valve 5' to control the pneumatic commutation valve 5' to start the A' working port of the pneumatic commutation valve 5', so that the A' working port of the pneumatic commutation valve 5' is communicated with the P' intake port of the pneumatic commutation valve 5'; the second commutation trigger device 4' is connected to the pneumatic commutation valve 5' to control the pneumatic commutation valve 5' to start the B' working port of the pneumatic commutation valve 5', so that the B' working port of the pneumatic commutation valve 5' is communicated with the P' intake port of the pneumatic commutation valve 5'.

[0004] The working process of the above hydraulic station is as follows: The pneumatic piston is located on the left side inside the air cylinder 1', triggering the opening of the first commutation trigger device 3', pushing the pneumatic commutation valve 5' to commutate, and compressed air enters the air cylinder 1' from the A' working port and enters the space on the left side of the pneumatic piston, thereby pushing the pneumatic piston to move to the right (the first commutation trigger device 3' is reset and cut off), driving the oil cylinder piston in the oil cylinder 2' to move to the right; when the pneumatic piston moves to the right side of the air cylinder 1', triggering the opening of the second commutation trigger device 4', pushing the pneumatic commutation valve 5' to commutate, and compressed air enters the air cylinder 1' from the B' working port and enters the space on the right side of the pneumatic piston, thereby pushing the pneumatic piston to move to the left (the second commutation trigger device 4' is reset and cut off), driving the oil cylinder piston in the oil cylinder 2' to move to the left, so that the hydraulic oil enters and exits; the reciprocating movement of the air cylinder 1' forms a hydraulic output. When the set pressure is reached, the air cylinder 1' stops moving to maintain a constant pressure, and the air cylinder 1' remains in a pressurized state and stops moving, thus no longer consuming compressed air. Compared with traditional hydraulic stations, it reduces energy consumption and heat generation and achieves the purpose of energy conservation.

[0005] In the above hydraulic station, during the process of the cylinder piston driving the oil cylinder piston to reverse, since the stroke is zero when the piston reverses, and it takes a certain amount of time for the oil cylinder piston in the initial stage after reversing to squeeze the oil in the oil cylinder to generate the required oil supply pressure, the oil supply of the oil cylinder will pause and continuous oil supply cannot be achieved. Summary of the Invention

[0006] The present invention provides a hydraulic station capable of achieving continuous oil supply.

[0007] An embodiment of the present invention provides a hydraulic station, including a cylinder, a commutation trigger device capable of sending a signal indicating that the cylinder piston has moved in place, a commutation valve for switching the intake and exhaust of the two cylinder cavities of the cylinder according to the signal of the commutation trigger device, and an oil cylinder linked with the cylinder. The oil cylinder can draw hydraulic oil from an oil tank through a first oil supply pipeline and supply it to an actuator. The hydraulic station further includes a hydraulic oil pump for drawing hydraulic oil from the oil tank and supplying it to the actuator through a second oil supply pipeline, and a pressure detection device for detecting the intake pressure of the commutation valve or the oil pressure at the oil outlet of the oil cylinder. The first oil supply pipeline is provided with a first one-way valve to prevent the hydraulic oil in the second oil supply pipeline from entering the first oil supply pipeline. The hydraulic oil pump starts when the pressure detection device detects that the intake pressure or the oil pressure drops to a first set value.

[0008] In some of these embodiments, the pressure detection device is arranged on the pipeline of the first oil supply pipeline between the first one-way valve and the oil cylinder.

[0009] In some of these embodiments, the pressure detection device is arranged on the intake pipe of the commutation valve.

[0010] In some of these embodiments, the pressure detection device includes a pressure switch or a pressure sensor.

[0011] In some of these embodiments, after the pressure detection device detects that the intake pressure or the oil pressure rises to the first set value and continues to remain closed for a set time, the hydraulic oil pump shuts down.

[0012] In some of these embodiments, when the pressure detection device detects that the intake pressure or the oil pressure rises to a second set value, the hydraulic oil pump shuts down, where the second set value is greater than the first set value.

[0013] In some of these embodiments, the second oil supply pipeline is provided with a second one-way valve to prevent the hydraulic oil in the first oil supply pipeline from entering the second oil supply pipeline.

[0014] In some of these embodiments, an accumulator is arranged on the first oil supply pipeline.

[0015] In some of these embodiments, the accumulator is arranged on the pipeline of the first oil supply pipeline between the first one-way valve and the oil cylinder.

[0016] In some of these embodiments, the hydraulic station further includes a controller that controls the start or stop of the hydraulic oil pump according to the pressure signal detected by the pressure detection device.

[0017] A hydraulic station provided according to an embodiment of the present invention includes a cylinder, a commutation trigger device that can emit a signal indicating that the cylinder piston has moved into place, a commutation valve that switches the intake and exhaust of the two cylinder cavities of the cylinder according to the signal of the commutation trigger device, and an oil cylinder linked to the cylinder. The oil cylinder can draw hydraulic oil from the fuel tank through a first oil supply pipeline and supply it to the actuator. The hydraulic station further includes a hydraulic oil pump that draws hydraulic oil from the fuel tank and supplies it to the actuator through a second oil supply pipeline, and a pressure detection device for detecting the intake pressure of the commutation valve or the oil outlet oil pressure of the oil cylinder. The first oil supply pipeline is provided with a first one-way valve to prevent the hydraulic oil in the second oil supply pipeline from entering the first oil supply pipeline. The hydraulic oil pump starts when the pressure detection device detects that the intake pressure or the oil pressure has dropped to a first set value. By setting the pressure detection device to detect whether the intake pressure of the commutation valve or the oil outlet oil pressure of the oil cylinder has dropped to the first set value, the hydraulic station of the present invention realizes the detection of whether the oil supply of the oil cylinder has stopped. By setting the hydraulic oil pump and starting it when the pressure detection device detects that the intake pressure of the commutation valve or the oil outlet oil pressure of the oil cylinder has dropped to the first set value, the hydraulic station realizes the use of the hydraulic oil pump for oil supply when the oil supply of the oil cylinder stops, thereby realizing continuous oil supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those skilled in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 is a schematic structural diagram of a hydraulic station provided in the prior art;

[0020] Figure 2 is a schematic connection structure diagram of the oil cylinder, cylinder, commutation trigger device, commutation valve and auxiliary exhaust valve in the hydraulic station provided by the embodiment of the present invention;

[0021] Figure 3 is a schematic structural diagram of the pneumatic control valve and the core shaft in the hydraulic station provided by the embodiment of the present invention;

[0022] Figure 4 is a schematic structural diagram of the contact switch, core shaft and commutation valve in the hydraulic station provided by the embodiment of the present invention;

[0023] Figure 5 is a schematic structural diagram of the contact switch and the core shaft in the hydraulic station provided by the embodiment of the present invention;

[0024] Figure 6 Schematic structural diagram of a proximity switch, a mandrel and a reversing valve in the hydraulic station provided by the embodiment of the present invention;

[0025] Figure 7 Schematic structural diagram of a proximity switch and a mandrel in the hydraulic station provided by the embodiment of the present invention;

[0026] Figure 8 Schematic connection diagram of a proximity switch and a reversing valve in the hydraulic station provided by the embodiment of the present invention;

[0027] Figure 9 Schematic structural diagram at the mandrel in the hydraulic station provided by the embodiment of the present invention;

[0028] Figure 10 Schematic structural diagram when the pressure detection device in the hydraulic station provided by the embodiment of the present invention detects the oil outlet oil pressure of the oil cylinder;

[0029] Figure 11 Schematic connection diagram of a pressure switch, a 24V power supply and the coil of an AC contactor in the hydraulic station provided by the embodiment of the present invention;

[0030] Figure 12 Schematic structural diagram when the pressure detection device in the hydraulic station provided by the embodiment of the present invention detects the intake air pressure of the reversing valve;

[0031] Figure 13 Schematic connection diagram of a pressure sensor, a processor and a control switch in the hydraulic station provided by the embodiment of the present invention. Detailed implementation manners

[0032] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0033] Refer to Figure 2-13 , the embodiment of the present invention provides a hydraulic station, including a cylinder 1, a reversing trigger device 2 that can send a signal indicating that the cylinder piston has moved in place, a reversing valve 3 that switches the intake and exhaust of the two cylinder cavities of the cylinder according to the signal of the reversing trigger device, and an oil cylinder 4 linked with the cylinder 1. Among them, the oil cylinder 4 can draw hydraulic oil from the fuel tank 18 through the first oil supply pipeline 10 under the drive of the cylinder 1 and supply it to the actuator 13.

[0034] The cylinder 1 has a cylinder block, a cylinder piston 101 and cylinder end covers 102. Among them, the cylinder piston 101 can slide along the inner wall of the cylinder block and form an airtight seal with the inner wall of the cylinder block. The cylinder end covers 102 are arranged at both ends of the cylinder block to seal the cylinder block. There are two cylinder cavities on both sides of the cylinder piston 101. When the cylinder cavity on one side of the cylinder piston 101 intakes air, the cylinder cavity on the other side discharges air, so that the cylinder piston 101 moves back and forth between the two ends under the action of air pressure. The cylinder piston 101 of the cylinder 1 is connected to the oil cylinder piston 401 of the oil cylinder 4 through a linkage rod 5. The linkage rod 5 is slidably arranged through the cylinder end cover 102 adjacent to the oil cylinder 4 in the cylinder 1, so that the cylinder piston 101 and the oil cylinder piston 401 slide synchronously.

[0035] The oil cylinder 4 extracts hydraulic oil from the oil tank 18 through the first oil extraction pipeline 32. A first filter element 33 is installed at the oil extraction end of the first oil extraction pipeline 32 to filter the hydraulic oil. The first oil supply pipeline 10 supplies the hydraulic oil to the oil inlet pipeline 14 of the actuator 13. A pressure gauge 16 is arranged on the oil inlet pipeline 14 of the actuator 13 to detect the pressure. The oil outlet pipeline 17 of the actuator 13 discharges the hydraulic oil into the oil tank 18.

[0036] There are two commutation trigger devices 2, namely a first commutation trigger device and a second commutation trigger device. The first commutation trigger device and the second commutation trigger device are respectively arranged at both ends of the cylinder 1 to respectively obtain whether the cylinder piston 101 of the cylinder 1 moves in place at both ends, and can send corresponding in-place signals when the cylinder piston 101 moves in place at both ends.

[0037] The first commutation trigger device and the second commutation trigger device can both be pneumatic valves, which are respectively denoted as the first pneumatic valve block 201 and the second pneumatic valve block 202. The first pneumatic valve block 201 is provided with a first air inlet E and a first air outlet C on its valve body. The first air inlet E is communicated with the air source 11, and the first air outlet C is communicated with the first control port Y1 of the pneumatic reversing valve 301. A first pneumatic valve block 201 spool that can move leftward under pressure and move rightward under elastic action is arranged in the valve body of the first pneumatic valve block 201. When the first pneumatic valve block 201 spool moves leftward in place, the first air inlet E and the first air outlet C are communicated. The starting block part of the first pneumatic valve block 201 spool protrudes from the right end of the valve body of the first pneumatic valve block 201 and is pushed by the cylinder piston 101. Under the above conditions, when the cylinder piston 101 moves leftward in place under the action of air pressure, the cylinder piston 101 touches the starting block part of the first pneumatic valve block 201 spool, and the first pneumatic valve block 201 spool moves leftward until the first air inlet E and the first air outlet C are communicated, realizing the communication between the air source 11 and the first control port Y1, so as to pressurize the gas into the first control port Y1. In the above process, by judging whether the starting block part of the first pneumatic valve block 201 spool is touched, it is obtained whether the cylinder piston 101 moves leftward in place, and by pressurizing the gas into the first control port Y1, a signal indicating that the movement is in place is sent. The second pneumatic valve block 202 is provided with a second air inlet F and a second air outlet D on its valve body. The second air inlet F is communicated with the air source 11, and the second air outlet D is communicated with the second control port Z1 of the pneumatic reversing valve 301. A second pneumatic valve block 202 spool that can move rightward under pressure and move leftward under elastic action is arranged in the valve body of the second pneumatic valve block 202. When the second pneumatic valve block 202 spool moves rightward in place, the second air inlet F and the second air outlet D are communicated. The starting block part of the second pneumatic valve block 202 spool protrudes from the left end of the valve body of the second pneumatic valve block 202 and is pushed by the cylinder piston 101. Under the above conditions, when the cylinder piston 101 moves rightward in place under the action of air pressure, the cylinder piston 101 touches the starting block part of the second pneumatic valve block 202 spool, and the second pneumatic valve block 202 spool moves rightward until the second air inlet F and the second air outlet D are communicated, realizing the communication between the air source 11 and the second control port Z1, so as to pressurize the gas into the second control port Z1. In the above process, by judging whether the starting block part of the second pneumatic valve block 202 spool is touched, it is obtained whether the cylinder piston 101 moves rightward in place, and by pressurizing the gas into the second control port Z1, a signal indicating that the movement is in place is sent.

[0038] The first commutation trigger device and the second commutation trigger device may both be electromagnetic control valves, which are respectively denoted as the first electromagnetic control valve and the second electromagnetic control valve. The first electromagnetic control valve and the second electromagnetic control valve may both include a contact switch 204. Inside the housing of the contact switch 204, there are a first reed 2041, a second reed 2042, a first terminal 2043, and a second terminal 2044. The first reed 2041 and the second reed 2042 are spaced apart by a preset distance and are brought into contact with the second reed 2042 upon being touched. The first terminal 2043 is electrically connected to the first reed 2041, and the second terminal 2044 is electrically connected to the second reed 2042. On the housing of the contact switch 204, there are an outlet 2045 and a guide post 2046. The outlet 2045 is for leading out the wires connected to the first terminal 2043 and the second terminal 2044, and the guide post 2046 can touch the first reed 2041 and is pushed by the cylinder piston 101. The first electromagnetic control valve and the second electromagnetic control valve may both include a proximity switch 205. The proximity switch 205 operates when it senses a metal detection body. The proximity switch 205 is connected to the circuit controller 9, and the circuit controller 9 is connected to the electromagnetic control reversing valve 302 and the power supply 10.

[0039] The reversing valve 3 is respectively connected to the first commutation trigger device and the second commutation trigger device to sequentially switch the intake and exhaust of the two cylinder cavities of the cylinder according to the signals sent by the first commutation trigger device and the second commutation trigger device.

[0040] The reversing valve 3 can be a pneumatically controlled reversing valve 301. The body of the pneumatically controlled reversing valve 301 is provided with a first control port Y1, a second control port Z1, a first working port A1, a second working port B1, a third air inlet P1, a third exhaust port R11, and a fourth exhaust port R12. The first control port Y1 is communicated with the first exhaust port C of the first pneumatic valve block 201, the second control port Z1 is communicated with the second exhaust port D of the second pneumatic valve block 202, the first working port A1 is communicated with the cylinder cavity on the left side of the cylinder piston 101 of the cylinder 1, the second working port B1 is communicated with the cylinder cavity on the right side of the cylinder piston 101, the third air inlet P1 is communicated with the air source 11. Inside the valve body of the pneumatically controlled reversing valve 301, there is a pneumatically controlled reversing valve 301 spool that can move to the right under the action of the air pressure in the first control port Y1 and move to the left under the action of the air pressure in the second control port Z1. When the pneumatically controlled reversing valve 301 spool moves to the right in place, the first working port A1 is communicated with the third air inlet P1, and the second working port B1 is communicated with the fourth exhaust port R12. When the pneumatically controlled reversing valve 301 spool moves to the left in place, the second working port B1 is communicated with the third air inlet P1, and the first working port A1 is communicated with the third exhaust port R11. Under the above conditions, after pressurizing the gas into the first control port Y1, the pneumatically controlled reversing valve 301 spool moves to the right until the first working port A1 is communicated with the third air inlet P1 to realize air intake, and the second working port B1 is communicated with the fourth exhaust port R12 to realize air exhaust, so that the cylinder cavity on the left side of the cylinder piston 101 intakes air, and the cylinder cavity on the right side exhausts air, and the cylinder piston 101 moves to the right under the action of the air pressure. After pressurizing the gas into the second control port Z1, the pneumatically controlled reversing valve 301 spool moves to the left until the second working port B1 is communicated with the third air inlet P1 to realize air intake, and the first working port A1 is communicated with the third exhaust port R11 to realize air exhaust, so that the cylinder cavity on the right side of the cylinder piston 101 intakes air, and the cylinder cavity on the left side exhausts air, and the cylinder piston 101 moves to the left under the action of the air pressure. In the above process, the reversing valve 3 sequentially switches the air intake and exhaust of the two cylinder cavities of the cylinder according to the pressurization of the gas into the first control port Y1 and the second control port Z1.

[0041] The reversing valve 3 can be an electrically controlled reversing valve, such as a two-position five-way solenoid valve. On the valve body of the electrically controlled reversing valve 302, there are a first relay terminal Y2, a second relay terminal Z2, a third working port A2, a fourth working port B2, a fourth air inlet P2, a fifth exhaust port R21, and a sixth exhaust port R22. The first relay terminal Y2 and the second relay terminal Z2 are respectively connected to the first electrically controlled valve and the second electrically controlled valve. The third working port A2 communicates with the cylinder cavity on the left side of the cylinder piston 202 of the cylinder 2. The fourth working port B2 communicates with the cylinder cavity on the right side of the cylinder piston 202. The fourth air inlet P2 communicates with the air source 22. Inside the valve body of the electrically controlled reversing valve 302, there is an electrically controlled reversing valve 302 spool that can move to the right under the control of the first relay terminal Y2 and move to the left under the control of the second relay terminal Z2. When the electrically controlled reversing valve 302 spool moves to the right in place, the third working port A2 communicates with the fourth air inlet P2, and the fourth working port B2 communicates with the sixth exhaust port R22. When the electrically controlled reversing valve 302 spool moves to the left in place, the fourth working port B2 communicates with the fourth air inlet P2, and the third working port A2 communicates with the fifth exhaust port R21.

[0042] The hydraulic cylinder can further include an auxiliary exhaust valve 6. The auxiliary exhaust valve 6 has an auxiliary exhaust port and two exhaust control ports. One exhaust control port of the auxiliary exhaust valve 6 is simultaneously communicated with one cylinder cavity of the cylinder 1 and one working port of the reversing valve 3. The other exhaust control port of the auxiliary exhaust valve 6 is simultaneously communicated with the other cylinder cavity of the cylinder 1 and the other working port of the reversing valve 3. The auxiliary exhaust port communicates the other cylinder cavity of the cylinder 1 with the outside when one cylinder cavity of the cylinder 1 intakes air.

[0043] The auxiliary exhaust valve 6 includes an auxiliary exhaust valve body and an auxiliary exhaust valve core. The auxiliary exhaust valve body has a hollow structure. The auxiliary exhaust valve body is provided with a first exhaust control port G, a second exhaust control port H, and an auxiliary exhaust port S. The first exhaust control port G is simultaneously communicated with the cylinder cavity on one side of the cylinder piston 101 of the cylinder 1 and the first working port A1 of the reversing valve 3. The second exhaust control port H is simultaneously communicated with the cylinder cavity on the other side of the cylinder piston 101 and the second working port B1 of the reversing valve 3. The auxiliary exhaust port S is communicated with the outside. The auxiliary exhaust valve core is slidably arranged in the auxiliary exhaust valve body and slides to the first position under the action of the air pressure in the first exhaust control port G, so that the first exhaust control port G is not communicated with the auxiliary exhaust port S, and the second exhaust control port H is communicated with the auxiliary exhaust port S. And it slides to the second position under the action of the air pressure in the second exhaust control port H, so that the first exhaust control port G is communicated with the auxiliary exhaust port S, and the second exhaust control port H is not communicated with the auxiliary exhaust port S. Among them, the first exhaust control port G and the second exhaust control port H are respectively arranged at the left and right ends of the auxiliary exhaust valve body. The auxiliary exhaust port S is arranged at the upper part of the auxiliary exhaust valve body and is arranged at the middle position of the auxiliary exhaust valve body. A muffler is arranged at the auxiliary exhaust port. Under the above conditions, after the first working port A1 intakes air, the cylinder cavity on the left side of the cylinder piston 101 intakes air, and the gas pressurizes into the first exhaust control port G. The valve body of the auxiliary exhaust valve 6 moves to the right, and the second exhaust control port H is communicated with the auxiliary exhaust port S to realize exhaust. The cylinder cavity on the right side of the cylinder piston 101 exhausts through the auxiliary exhaust port S and the second working port B1. After the second working port B1 intakes air, the cylinder cavity on the right side of the cylinder piston 101 intakes air, and the gas pressurizes into the second exhaust control port H. The valve body of the auxiliary exhaust valve 6 moves to the left, and the first exhaust control port G is communicated with the auxiliary exhaust port S to realize exhaust. The cylinder cavity on the left side of the cylinder piston 101 exhausts through the auxiliary exhaust port S and the first working port A1.

[0044] The hydraulic station further includes a mandrel 7. The mandrel 7 is slidably and sealingly penetrated through the cylinder end cover 102. The first end and the second end of the mandrel 7 in its sliding direction respectively extend inside and outside the cylinder 1, so that the first end is pushed by the cylinder piston 101 of the cylinder 1, and the second end triggers the reversing trigger device 2. Specifically, the mandrel 7 is slidably and sealingly penetrated through the two end covers 102 of the cylinder 1. The first end and the second end of the mandrel 7 in its sliding direction respectively extend inside and outside the cylinder 1, so that the first end is pushed by the cylinder piston 101 of the cylinder 1, and the second end triggers the first reversing trigger device and the second reversing trigger device.

[0045] To prevent the gas inside the cylinder cavity from flowing out from the adjacent mandrel 7 when the cylinder cavity intakes air, a shaft hole 1021 for the mandrel 7 to pass through is provided on the cylinder end cover 102, and the inner peripheral wall of the shaft hole 1021 has a first contact sealing structure 1022. The outer peripheral wall of the mandrel 7 has a second contact sealing structure 701, and the second contact sealing structure 701 is arranged on the side of the first contact sealing structure 1022 close to the outside of the cylinder 1. The second contact sealing structure 701 can contact the first contact sealing structure 1022 to form a mechanical line seal or a mechanical surface seal. Under the above conditions, before the mandrel 7 is pushed by the cylinder piston 101, the second contact sealing structure 701 contacts the first contact sealing structure 1022 to form a mechanical line seal or a mechanical surface seal.

[0046] Specifically, the inner peripheral wall of the shaft hole 1021 has a first hole section and a second hole section. The first hole section is arranged on the side of the second hole section close to the inside of the cylinder 1. The inner diameter of the first hole section is smaller than that of the second hole section. The transition surface between the first hole section and the second hole section has a first contact sealing structure 1022. The mandrel 7 has a first shaft section 704 and a second shaft section 705. The outer diameters of the first shaft section 704 and the second shaft section 705 are respectively in clearance fit with the inner diameter of the first hole section and the inner diameter of the second hole section. The transition surface between the first shaft section 704 and the second shaft section 705 has a second contact sealing structure 701. Under the above conditions, the first contact sealing structure 1022 contacts the second contact sealing structure 701 to form a mechanical surface seal.

[0047] To form the first contact sealing structure 1022 and the second contact sealing structure 701, the transition surface between the first hole section and the second hole section includes a first annular plane perpendicular to the center line of the shaft hole 1021, and the first annular plane constitutes the first contact sealing structure 1022. The transition surface between the first shaft section 704 and the second shaft section 705 includes a second annular plane perpendicular to the center line of the mandrel 7, and the second annular plane constitutes the second contact sealing structure 701. The transition surface between the first hole section and the second hole section includes a first conical surface that gradually contracts towards the inside of the cylinder 1, and the first conical surface constitutes the first contact sealing structure 1022. The transition surface between the first shaft section 704 and the second shaft section 705 includes a second conical surface that gradually contracts towards the inside of the cylinder 1, and the second conical surface constitutes the second contact sealing structure 701.

[0048] Of course, to further prevent the gas inside the cylinder cavity from flowing out from the adjacent mandrel 7 when the cylinder cavity intakes air, a sealing ring 703 can be provided between the outer peripheral wall of the second shaft section 705 and the inner peripheral wall of the second hole section. Among them, a groove is provided on the outer peripheral wall of the second shaft section 705, and the sealing ring 703 is embedded in the groove. The number of the sealing rings 703 is multiple, such as two, and each sealing ring 703 is arranged at a certain distance along the center line of the mandrel 7.

[0049] To enable the second contact sealing structure 701 to contact the first contact sealing structure 1022 and form a mechanical line seal or a mechanical surface seal, the mandrel 7 has a third shaft section 706. The third shaft section 706 is arranged on the side of the second shaft section 705 close to the outside of the cylinder 1. The outer diameter of the third shaft section 706 is smaller than the outer diameter of the second shaft section 705. A spring 702 is sleeved outside the third shaft section 706. One end of the spring 702 abuts against the transition surface between the third shaft section 706 and the second shaft section 705. A cover 8 is installed at the side of the shaft hole 1021 close to the outside of the cylinder 1. The cover 8 abuts against the other end of the spring 702. There is a clearance fit between the outer peripheral wall of the third shaft section 706 and the inner peripheral wall of the shaft hole 1021.

[0050] Specifically, a through hole 801 for the mandrel 7 to pass through is formed in the cover 8. The inner peripheral wall of the through hole 801 has a third hole section and a fourth hole section. The third hole section is arranged on the side of the fourth hole section close to the inside of the cylinder 1. The inner diameter of the third hole section is larger than the inner diameter of the fourth hole section. The transition surface between the third hole section and the fourth hole section abuts against the other end of the spring 702. There is a clearance fit between the inner peripheral wall of the through hole 801 and the outer peripheral wall of the mandrel 7.

[0051] By arranging the mandrel 7 on the cylinder end cover 102, the cylinder piston 101 triggers the commutation trigger device 2 through the mandrel 7, so that the commutation trigger device 2 is separately arranged from the cylinder end cover 102, which is convenient for the maintenance and replacement of the commutation trigger device 2. By arranging the mandrel 7 on the cylinder end cover 102 to trigger the proximity switch 205 instead of arranging a magnetic ring on the cylinder piston 101 to trigger the proximity switch 205, the problems that the magnetic ring attracts the metal body outside the cylinder 1 and affects the use and the magnetic ring is damaged and not easy to repair and replace are avoided. By arranging the first contact sealing structure 701 and the second contact sealing structure 1022, before the mandrel 7 is pushed by the cylinder piston 101, the second contact sealing structure 701 contacts the first contact sealing structure 1022 and forms a mechanical line seal or a mechanical surface seal. Thus, it is possible to omit the setting of a sealing ring between the outer peripheral wall of the mandrel 7 and the inner peripheral wall of the shaft hole 1021. When the mandrel 7 is pushed by the cylinder piston 101 to trigger the commutation trigger device 2, the sealing ring blocks the gap between the outer peripheral wall of the mandrel 7 and the inner peripheral wall of the shaft hole 1021, thus avoiding affecting the triggering of the commutation trigger device 2 and further avoiding the jamming phenomenon of the reversing valve 3.

[0052] The hydraulic station further includes a hydraulic oil pump 19 that extracts hydraulic oil from the oil tank 18 and supplies it to the actuator 13 via the second oil supply pipeline 22, and a pressure detection device for detecting the intake pressure of the directional control valve 3 or the oil outlet pressure of the oil cylinder 4. The hydraulic oil pump 19 starts when the pressure detection device detects that the intake pressure or the oil pressure drops to the first set value. Among them, a first one-way valve 15 is provided in the first oil supply pipeline 10 to prevent the hydraulic oil in the second oil supply pipeline 22 from entering the first oil supply pipeline 10. A second one-way valve 23 is provided in the second oil supply pipeline 22 to prevent the hydraulic oil in the first oil supply pipeline 10 from entering the second oil supply pipeline 22.

[0053] The hydraulic oil pump 19 extracts hydraulic oil from the oil tank 18 through the second oil extraction pipeline 20. The oil extraction end of the second oil extraction pipeline 20 is provided with a second filter element 21 to filter the hydraulic oil. The second oil supply pipeline 22 supplies the hydraulic oil to the oil inlet pipeline 14 of the actuator 13.

[0054] The pressure detection device is arranged on the pipeline of the first oil supply pipeline 10 between the first one-way valve 15 and the oil cylinder 4 to detect the oil outlet pressure of the oil cylinder 4. Alternatively, the pressure detection device is arranged on the intake pipe 12 of the directional control valve 3 to detect the intake pressure of the directional control valve 3. The pressure detection device includes a pressure switch 24 and a pressure sensor 27.

[0055] When the pressure detection device detects that the intake pressure of the directional control valve 3 or the oil outlet pressure of the oil cylinder 4 is lower than the first set value, it closes or sends a signal to start the hydraulic oil pump 19, that is, to make the motor 32 of the hydraulic oil pump 19 start to work. Among them, the first set value can be set to 2 MPa. The first set value can also be set to other pressures, such as 4 MPa, 6 MPa, and is specifically set according to requirements.

[0056] When the pressure detection device detects that the intake pressure of the directional control valve 3 or the oil outlet pressure of the oil cylinder 4 rises to the first set value and continues to remain closed for a set time, it disconnects to stop the hydraulic oil pump 19, that is, to stop the motor 32 of the hydraulic oil pump 19, so as to avoid frequent starting of the motor 32 of the hydraulic oil pump 19. Among them, the set time can be set to 30 s. The set time can also be set to other times, such as 40 s, 50 s, and is specifically set according to requirements.

[0057] The pressure detection device can be a pressure switch with two set values, namely the lower limit set value and the upper limit set value. The pressure switch disconnects when the detected pressure is lower than the lower limit set value and closes when the detected pressure is higher than the upper limit set value. Among them, the lower limit set value is equal to the first set value. For example, when the first set value is set to 2 MPa, the lower limit set value is also set to 2 MPa. The upper limit set value is greater than the first set value. For example, when the first set value is set to 2 MPa, the upper limit set value can be set to 5 MPa. The upper limit set value can also be set to other pressures, such as 6 MPa, 7 MPa, and is specifically set according to requirements.

[0058] When the pressure detection device detects that the intake pressure of the reversing valve 3 or the oil outlet oil pressure of the oil cylinder 4 rises to the second set value, it disconnects or sends a signal to stop the hydraulic oil pump 19, that is, to stop the motor 32 of the hydraulic oil pump 19. Among them, the second set value is greater than the first set value. For example, when the first set value is set to 2 MPa, the second set value can be set to 10 MPa. The second set value can also be set to other pressures, such as 15 MPa, 20 MPa, and is specifically set according to requirements. The second set value is also greater than the above upper limit set value. For example, when the above upper limit set value is set to 5 MPa, the second set value can be set to 10 MPa. The second set value can also be set to other pressures, such as 15 MPa, 20 MPa, and is specifically set according to requirements.

[0059] The hydraulic station further includes an accumulator 9 provided on the first oil supply pipeline 10. The accumulator 9 is provided on the pipeline of the first oil supply pipeline 10 between the first one-way valve 15 and the oil cylinder 4. A pressure detection device, such as a pressure switch, is provided at the connection of the accumulator 9 and the first oil supply pipeline 10.

[0060] The hydraulic station further includes a controller. The controller controls the start or stop of the hydraulic oil pump 19 according to the pressure signal detected by the pressure detection device.

[0061] When the pressure detection device is the pressure switch 24, the controller includes a first AC contactor 25. The first AC contactor 25 is provided on the motor power supply circuit of the hydraulic oil pump 19, and the pressure switch 24 is provided on the coil power supply circuit of the first AC contactor 25. Specifically, the motor 32 of the hydraulic oil pump 19 is connected in series with the first AC contactor 25, and the coil 33 of the first AC contactor 25 is connected in series with the pressure switch 24 between the positive and negative poles of the 24V power supply 34. A first air switch 26 is provided at the incoming line of the first AC contactor 25.

[0062] When the pressure detection device is the pressure sensor 27, the controller includes a second AC contactor 28, a control switch 29 and a processor 30. The second AC contactor 28 is arranged on the motor power supply circuit of the hydraulic oil pump 19. The control switch 29 is arranged on the coil power supply circuit of the second AC contactor 28. The processor 30 is connected to the pressure sensor 27 and the control switch 29, and controls the control switch 29 to close after receiving a signal. Specifically, the motor 32 of the hydraulic oil pump 19 is connected in series with the second AC contactor 28, and the coil of the second AC contactor 28 and the control switch 29 are connected in series between the positive and negative poles of the 24V power supply. A second air switch 31 is arranged at the incoming line of the second AC contactor 28.

[0063] In summary, the present invention realizes the detection of whether the oil supply of the oil cylinder 4 is interrupted by setting a pressure detection device to detect whether the intake pressure of the reversing valve 3 or the oil outlet oil pressure of the oil cylinder 4 drops to the first set value. By setting the hydraulic oil pump 19 and starting it when the pressure detection device detects that the intake pressure of the reversing valve 3 or the oil outlet oil pressure of the oil cylinder 4 drops to the first set value, the present invention realizes the oil supply by using the hydraulic oil pump 19 when the oil supply of the oil cylinder 4 is interrupted, so as to realize continuous oil supply.

[0064] In the drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and cannot be understood as a limitation of this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A hydraulic station, comprising a cylinder, a reversing trigger device capable of sending a signal that the cylinder piston of the cylinder has moved into position, a reversing valve for switching the air intake and exhaust of two cylinder cavities of the cylinder according to the signal of the reversing trigger device, and an oil cylinder linked to the cylinder, wherein the oil cylinder can draw hydraulic oil from the oil tank and supply it to the actuator through a first oil supply pipeline under the drive of the cylinder; characterized in that: It also includes a hydraulic oil pump that draws hydraulic oil from the oil tank and supplies it to the actuator through a second oil supply pipeline, and a pressure detection device for detecting the intake pressure of the reversing valve or the oil pressure at the oil outlet of the oil cylinder; the first oil supply pipeline is provided with a first check valve to prevent the hydraulic oil in the second oil supply pipeline from entering the first oil supply pipeline; the hydraulic oil pump starts when the pressure detection device detects that the intake pressure or the oil pressure drops to a first set value.

2. The hydraulic station according to claim 1, characterized in that: The pressure detection device is arranged on the pipeline between the first one-way valve and the oil cylinder on the first oil supply pipeline.

3. The hydraulic station according to claim 1, characterized in that: The pressure detection device is arranged on the air inlet pipe of the reversing valve.

4. The hydraulic station according to claim 1, characterized in that: The pressure detection device includes a pressure switch or a pressure sensor.

5. The hydraulic station according to claim 1, characterized in that: After the pressure detection device detects that the intake pressure or the oil pressure rises to the first set value and continues to remain closed for a set time, the hydraulic oil pump stops.

6. The hydraulic station according to claim 1, characterized in that: When the pressure detection device detects that the intake pressure or the oil pressure increases to a second set value, the hydraulic oil pump stops, wherein the second set value is greater than the first set value.

7. The hydraulic station according to claim 1, characterized in that: The second oil supply pipeline is provided with a second one-way valve to prevent the hydraulic oil in the first oil supply pipeline from entering the second oil supply pipeline.

8. The hydraulic station according to claim 1, characterized in that: An energy accumulator is arranged on the first oil supply pipeline.

9. The hydraulic station according to claim 8, characterized in that: The accumulator is disposed on the first oil supply pipeline between the first one-way valve and the oil cylinder.

10. The hydraulic station according to any one of claims 1 to 9, characterized in that: It also includes a controller, which controls the hydraulic oil pump to start or stop according to the pressure signal detected by the pressure detection device.

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