Hydraulic station

Abstract

The utility model 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 hydraulic oil pump is used for supplying oil when oil supply of the oil cylinder is stopped, and therefore continuous oil supply is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of hydraulic station especially relates to a hydraulic station. BACKGROUND

[0002] The hydraulic station is a hydraulic device that supplies oil according to the required flow direction, pressure and flow rate, and is usually used in combination with a machine tool that needs hydraulic drive to execute an actuator.

[0003] Referring to Figure 1 , it is the structural diagram of the hydraulic station provided in the prior art. As shown in the figure, the hydraulic station comprises: a linkage cylinder 1', an oil cylinder 2'; wherein, the two sides of the cylinder end cover of the cylinder 1' are respectively provided with a first reversing trigger device 3', a second reversing trigger device 4', and at the same time, the cylinder 1' is communicated with a pneumatic reversing valve 5', and the air source is connected with the air inlet of the first reversing trigger device 3', the second reversing trigger device 4' and the pneumatic reversing valve 5' respectively; the A' working port of the pneumatic reversing valve 5' is communicated with one side of the cylinder 1', and the B' working port of the pneumatic reversing valve 5' is communicated with the other side of the cylinder 1'; the first reversing trigger device 3' and the pneumatic reversing valve 5' are connected to control the pneumatic reversing valve 5' to start the A' working port of the pneumatic reversing valve 5' so that the A' working port of the pneumatic reversing valve 5' is communicated with the P' air inlet of the pneumatic reversing valve 5'; the second reversing trigger device 4' and the pneumatic reversing valve 5' are connected to control the pneumatic reversing valve 5' to start the B' working port of the pneumatic reversing valve 5' so that the B' working port of the pneumatic reversing valve 5' is communicated with the P' air inlet of the pneumatic reversing valve 5'.

[0004] The working process of the above-mentioned hydraulic station is as follows: the pneumatic piston is located in the left side of the cylinder 1', the first reversing trigger device 3' is triggered to open, the pneumatic reversing valve 5' is pushed to reverse, the compressed air enters the 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 reversing trigger device 3' resets to stop), driving the oil cylinder piston in the oil cylinder 2' to move to the right; the pneumatic piston moves to the right side of the cylinder 1', the second reversing trigger device 4' is triggered to open, the pneumatic reversing valve 5' is pushed to reverse, the compressed air enters the 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 reversing trigger device 4' resets to stop), driving the oil cylinder piston in the oil cylinder 2' to move to the left, so that the hydraulic oil is in and out; the reciprocating movement of the cylinder 1' forms the hydraulic output, when the set pressure is reached, the cylinder 1' stops moving to keep the pressure constant, the cylinder 1' keeps the pressure increasing state and stops moving, so that the compressed air is not consumed any more, compared with the traditional hydraulic station, the energy consumption and heat generation are reduced, and the energy saving purpose is achieved.

[0005] The hydraulic station can continuously supply oil. Technical content

[0006] The hydraulic station can continuously supply oil.

[0007] The hydraulic station can continuously supply oil.

[0008] In some embodiments, the pressure detection device is arranged on the pipeline on the first supply pipeline between the first check valve and the oil cylinder.

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

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

[0011] In some embodiments, the pressure detection device detects that the intake pressure or the oil pressure rises to the first set value and continues to keep closed for a set time, and the hydraulic oil pump stops.

[0012] In some embodiments, the pressure detection device detects that the intake pressure or the oil pressure rises to the second set value, and the hydraulic oil pump stops, wherein the second set value is greater than the first set value.

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

[0014] In some embodiments, an energy storage device is arranged on the first supply pipeline.

[0015] In some embodiments, the energy storage device is arranged on the pipeline on the first supply pipeline between the first check valve and the oil cylinder.

[0016] In some embodiments, the hydraulic station further comprises a controller, which controls the starting or stopping of the hydraulic oil pump according to the pressure signal detected by the pressure detection device.

[0017] The hydraulic station provided by the embodiment of the present application comprises a cylinder, a reversing trigger device capable of sending a cylinder piston movement to position signal of the cylinder, a reversing valve capable of switching the air intake and exhaust of the two cylinder cavities of the cylinder according to the signal of the reversing trigger device, an oil cylinder linked with the cylinder, and the oil cylinder can extract hydraulic oil from the oil tank and supply the actuating mechanism through the first oil supply pipeline under the driving of the cylinder. The hydraulic station further comprises a hydraulic oil pump for extracting hydraulic oil from the oil tank and supplying the actuating mechanism through the second oil supply pipeline, and a pressure detection device for detecting the air intake 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 the 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 intake pressure or the oil pressure is reduced to the first set value. The hydraulic station of the present application detects whether the air intake pressure of the reversing valve or the oil pressure of the oil outlet of the oil cylinder is reduced to the first set value through the pressure detection device, realizes the detection of whether the oil supply of the oil cylinder is stopped, and further realizes the oil supply by the hydraulic oil pump when the oil supply of the oil cylinder is stopped through the setting of the hydraulic oil pump and the starting of the hydraulic oil pump when the pressure detection device detects that the air intake pressure of the reversing valve or the oil pressure of the oil outlet of the oil cylinder is reduced to the first set value, thereby realizing continuous oil supply. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0019] Figure 1 The structure diagram of the hydraulic station provided in the prior art;

[0020] Figure 2 The connection structure diagram of the oil cylinder, the cylinder, the reversing trigger device, the reversing valve and the auxiliary exhaust valve in the hydraulic station provided by the embodiment of the present application;

[0021] Figure 3 The structure diagram of the pneumatic control valve and the mandrel in the hydraulic station provided by the embodiment of the present application;

[0022] Figure 4 The structure diagram of the contact switch, the mandrel and the reversing valve in the hydraulic station provided by the embodiment of the present application;

[0023] Figure 5The utility model discloses a structure schematic view of contact switch and mandrel in hydraulic station for the embodiment of the utility model provides.

[0024] Figure 6 The utility model discloses a structure schematic view of proximity switch and mandrel, reversing valve in hydraulic station for the embodiment of the utility model provides.

[0025] Figure 7 The utility model discloses a structure schematic view of proximity switch and mandrel in hydraulic station for the embodiment of the utility model provides.

[0026] Figure 8 The utility model discloses a connection schematic view of proximity switch and reversing valve in hydraulic station for the embodiment of the utility model provides.

[0027] Figure 9 The utility model discloses a structure schematic view of mandrel in hydraulic station for the embodiment of the utility model provides.

[0028] Figure 10 The utility model discloses a structure schematic view of pressure detection device detecting the oil pressure of the oil outlet of oil cylinder in hydraulic station for the embodiment of the utility model provides.

[0029] Figure 11 The utility model discloses a connection schematic view of pressure switch, 24V power supply and the coil of ac contactor in hydraulic station for the embodiment of the utility model provides.

[0030] Figure 12 The utility model discloses a structure schematic view of pressure detection device detecting the air inlet pressure of reversing valve in hydraulic station for the embodiment of the utility model provides.

[0031] Figure 13 The utility model discloses a connection schematic view of pressure sensor, processor and control switch in hydraulic station for the embodiment of the utility model provides. Specific implementation

[0032] In order to make the purpose, technical scheme and advantage of the utility model more clearly, the following is in conjunction with the figure and embodiment, and the utility model is further detailedly explained.It should be understood that the specific embodiment described here is only used to explain the utility model, and is not used to limit the utility model.

[0033] Reference Figures 2-13 The embodiment of the utility model provides a kind of hydraulic station, including cylinder 1, the reversing trigger device 2 that can send cylinder piston of cylinder moves to position signal and the reversing valve 3 of the signal switching two cylinder cavities of cylinder of reversing trigger device according to intake and exhaust, the oil cylinder 4 that is linked with cylinder 1.Wherein, oil cylinder 4 can be extracted from oil tank 18 under the drive of cylinder 1 hydraulic oil is supplied to actuating mechanism 13 via first oil supply line 10.

[0034] The cylinder 1 has a cylinder body, a cylinder piston 101 and cylinder end covers 102, wherein the cylinder piston 101 is slidable along the inner wall of the cylinder body and forms a gas-tight seal with the inner wall of the cylinder body, and the cylinder end covers 102 are arranged at both ends of the cylinder body to seal the cylinder body. The cylinder piston 101 has two cylinder cavities on both sides, and when the cylinder cavity on one side of the cylinder piston 101 is filled with air, the cylinder cavity on the other side is exhausted to make the cylinder piston 101 move 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 the linkage rod 5, and the linkage rod 5 is slidably arranged in the cylinder end cover 102 of the cylinder 1 near the oil cylinder 4 to make the cylinder piston 101 and the oil cylinder piston 401 slide synchronously.

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

[0036] The reversing trigger device 2 is two, which are the first reversing trigger device and the second reversing trigger device. The first reversing trigger device and the second reversing trigger device are arranged at both ends of the cylinder 1 respectively to obtain whether the cylinder piston 101 of the cylinder 1 moves to the position of both ends, and can send corresponding moving-to-position signals when the cylinder piston 101 moves to the position of both ends.

[0037] The first reversing trigger device and the second reversing trigger device can be air control valves, respectively denoted as a first air control valve block 201 and a second air control valve block 202. The first air control valve block 201 is provided with a first air inlet E and a first air outlet C on the valve body, the first air inlet E is communicated with the gas source 11, the first air outlet C is communicated with the first control port Y1 of the pneumatic reversing valve 301, and the first air control valve block 201 is provided with a first air control valve block 201 valve core which can move to the left under the action of pressure and move to the right under the action of elasticity. When the first air control valve block 201 valve core moves to the left to the position, the first air inlet E and the first air outlet C are communicated, and the starting block part of the first air control valve block 201 valve core is protruded on the right end of the first air control valve block 201 valve body and is driven by the cylinder piston 101. Under the above conditions, when the cylinder piston 101 moves to the left to the position under the action of gas pressure, the cylinder piston 101 drives the starting block part of the first air control valve block 201 valve core, the first air control valve block 201 valve core moves to the left, until the first air inlet E and the first air outlet C are communicated, the communication between the gas source 11 and the first control port Y1 is realized, so that the gas is pressurized into the first control port Y1. In the above process, whether the cylinder piston 101 moves to the left to the position is obtained by judging whether the starting block part of the first air control valve block 201 valve core is touched, and the moving to the position signal is sent by pressurizing the gas into the first control port Y1. The second air control valve block 202 is provided with a second air inlet F and a second air outlet D on the valve body, the second air inlet F is communicated with the gas source 11, the second air outlet D is communicated with the second control port Z1 of the pneumatic reversing valve 301, and the second air control valve block 202 is provided with a second air control valve block 202 valve core which can move to the right under the action of pressure and move to the left under the action of elasticity. When the second air control valve block 202 valve core moves to the right to the position, the second air inlet F and the second air outlet D are communicated, and the starting block part of the second air control valve block 202 valve core is protruded on the left end of the second air control valve block 202 valve body and is driven by the cylinder piston 101. Under the above conditions, when the cylinder piston 101 moves to the right to the position under the action of gas pressure, the cylinder piston 101 drives the starting block part of the second air control valve block 202 valve core, the second air control valve block 202 valve core moves to the right, until the second air inlet F and the second air outlet D are communicated, the communication between the gas source 11 and the second control port Z1 is realized, so that the gas is pressurized into the second control port Z1. In the above process, whether the cylinder piston 101 moves to the right to the position is obtained by judging whether the starting block part of the second air control valve block 202 valve core is touched, and the moving to the position signal is sent by pressurizing the gas into the second control port Z1.

[0038] The first reversing trigger device and the second reversing trigger device can each be an electrically controlled valve, respectively denoted as a first electrically controlled valve and a second electrically controlled valve. The first electrically controlled valve and the second electrically controlled valve can each include a contact switch 204. The contact switch 204 is provided with a first reed 2041, a second reed 2042, a first terminal post 2043 and a second terminal post 2044 in a shell of the contact switch 204. The first reed 2041 is spaced apart from the second reed 2042 by a preset distance and is in contact with the second reed 2042 upon being triggered. The first terminal post 2043 is electrically connected to the first reed 2041, and the second terminal post 2044 is electrically connected to the second reed 2042. The shell of the contact switch 204 is provided with a wire outlet 2045 and a guide column 2046. The wire outlet 2045 is used for leading out wires connected to the first terminal post 2043 and the second terminal post 2044. The guide column 2046 can trigger the first reed 2041 and be pushed by the cylinder piston 101. The first electrically controlled valve and the second electrically controlled valve can each include a proximity switch 205. The proximity switch 205 is triggered when a metal detection body is sensed. The proximity switch 205 is connected to a circuit controller 9, and the circuit controller 9 is connected to the electrically controlled reversing valve 302 and a power supply 10.

[0039] The reversing valve 3 is connected to the first reversing trigger device and the second reversing trigger device, respectively, to switch the air inlet and air outlet of the two cylinder cavities of the cylinder in sequence according to signals sent by the first reversing trigger device and the second reversing trigger device.

[0040] The reversing valve 3 can be a pneumatic reversing valve 301. The pneumatic 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 gas inlet port P1, a third gas outlet port R11 and a fourth gas outlet port R12 on the valve body. The first control port Y1 is in communication with the first gas outlet port C of the first pneumatic valve block 201. The second control port Z1 is in communication with the second gas outlet port D of the second pneumatic valve block 202. The first working port A1 is in communication with the left cylinder cavity of the cylinder piston 101 of the cylinder 1. The second working port B1 is in communication with the right cylinder cavity of the cylinder piston 101. The third gas inlet port P1 is in communication with the gas source 11. The pneumatic reversing valve 301 is provided with a pneumatic reversing valve core which can move right under the pressure in the first control port Y1 and move left under the pressure in the second control port Z1. When the pneumatic reversing valve core moves right to the position, the first working port A1 is in communication with the third gas inlet port P1, and the second working port B1 is in communication with the fourth gas outlet port R12. When the pneumatic reversing valve core moves left to the position, the second working port B1 is in communication with the third gas inlet port P1, and the first working port A1 is in communication with the third gas outlet port R11. Under the above conditions, when the gas is pressurized in the first control port Y1, the pneumatic reversing valve core moves right until the first working port A1 is in communication with the third gas inlet port P1 to realize gas inlet, and the second working port B1 is in communication with the fourth gas outlet port R12 to realize gas outlet, so that the left cylinder cavity of the cylinder piston 101 is filled with gas, and the right cylinder cavity is exhausted. The cylinder piston 101 moves right under the pressure. When the gas is pressurized in the second control port Z1, the pneumatic reversing valve core moves left until the second working port B1 is in communication with the third gas inlet port P1 to realize gas inlet, and the first working port A1 is in communication with the third gas outlet port R11 to realize gas outlet, so that the right cylinder cavity of the cylinder piston 101 is filled with gas, and the left cylinder cavity is exhausted. The cylinder piston 101 moves left under the pressure. In the above process, the reversing valve 3 switches the gas inlet and gas outlet of the two cylinder cavities of the cylinder in turn according to the pressurization of the gas in 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 electromagnetic valve. The electrically controlled reversing valve 302 is provided with a first relay end Y2, a second relay end Z2, a third working port A2, a fourth working port B2, a fourth inlet port P2, a fifth exhaust port R21, and a sixth exhaust port R22 on the valve body. The first relay end Y2 and the second relay end Z2 are connected to the first electrically controlled valve and the second electrically controlled valve, respectively. The third working port A2 is in communication with the left cylinder cavity of the cylinder piston 202 of the cylinder 2. The fourth working port B2 is in communication with the right cylinder cavity of the cylinder piston 202. The fourth inlet port P2 is in communication with the gas source 22. The electrically controlled reversing valve 302 is provided with an electrically controlled reversing valve spool that can move to the right under the control of the first relay end Y2 and move to the left under the control of the second relay end Z2. When the electrically controlled reversing valve spool moves to the right, the third working port A2 is in communication with the fourth inlet port P2, and the fourth working port B2 is in communication with the sixth exhaust port R22. When the electrically controlled reversing valve spool moves to the left, the fourth working port B2 is in communication with the fourth inlet port P2, and the third working port A2 is in communication with the fifth exhaust port R21.

[0042] The hydraulic cylinder can further include an auxiliary exhaust valve 6 having an auxiliary exhaust port and two exhaust control ports. One exhaust control port of the auxiliary exhaust valve 6 is in communication 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 in communication with the other cylinder cavity of the cylinder 1 and the other working port of the reversing valve 3. The auxiliary exhaust port is in communication with the other cylinder cavity of the cylinder 1 and the outside when the one cylinder cavity of the cylinder 1 is in intake.

[0043] The auxiliary exhaust valve 6 comprises an auxiliary exhaust valve body and an auxiliary exhaust valve core. The auxiliary exhaust valve body is a hollow structure, and 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 in communication 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 at the same time. The second exhaust control port H is in communication with the cylinder cavity on the other side of the cylinder piston 101 and the second working port B1 of the reversing valve 3 at the same time. The auxiliary exhaust port S is in communication with the outside. The auxiliary exhaust valve core is slidably arranged in the auxiliary exhaust valve body, and under the action of the gas pressure in the first exhaust control port G, the auxiliary exhaust valve core slides to the first position, so that the first exhaust control port G is not in communication with the auxiliary exhaust port S, and the second exhaust control port H is in communication with the auxiliary exhaust port S. Under the action of the gas pressure in the second exhaust control port H, the auxiliary exhaust valve core slides to the second position, so that the first exhaust control port G is in communication with the auxiliary exhaust port S, and the second exhaust control port H is not in communication with the auxiliary exhaust port S. 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 at the middle position of the auxiliary exhaust valve body. A silencer is arranged at the auxiliary exhaust port. Under the above conditions, after the first working port A1 is filled with gas, the cylinder cavity on the left side of the cylinder piston 101 is filled with gas, the gas pressurizes the first exhaust control port G, the auxiliary exhaust valve body 6 moves to the right, the second exhaust control port H is in communication with the auxiliary exhaust port S to realize exhaust, and the cylinder cavity on the right side of the cylinder piston 101 is exhausted through the auxiliary exhaust port S and the second working port B1. After the second working port B1 is filled with gas, the cylinder cavity on the right side of the cylinder piston 101 is filled with gas, the gas pressurizes the second exhaust control port H, the auxiliary exhaust valve body 6 moves to the left, the first exhaust control port G is in communication with the auxiliary exhaust port S to realize exhaust, and the cylinder cavity on the left side of the cylinder piston 101 is exhausted through the auxiliary exhaust port S and the first working port A1.

[0044] The hydraulic station further comprises a mandrel 7 which is slidably and sealingly arranged in the cylinder end cover 102, and the first end and the second end of the mandrel 7 in the sliding direction thereof respectively extend into and out of the cylinder 1, so that the first end is driven 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 arranged in the two end covers 102 of the cylinder 1, and the first end and the second end of the mandrel 7 in the sliding direction thereof respectively extend into and out of the cylinder 1, so that the first end is driven 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 avoid the gas in the cylinder cavity from flowing out from the adjacent spindle 7 when the cylinder cavity is filled with gas, the spindle hole 1021 is provided on the cylinder end cover 102 for the spindle 7 to pass through, and the inner peripheral wall of the spindle hole 1021 has a first contact sealing structure 1022. The outer peripheral wall of the spindle 7 has a second contact sealing structure 701, which is arranged on the side of the first contact sealing structure 1022 close to the outside of the cylinder 1, and can be in contact with the first contact sealing structure 1022 to form a mechanical linear seal or a mechanical surface seal. Under the above conditions, before the spindle 7 is driven by the cylinder piston 101, the second contact sealing structure 701 is in contact with the first contact sealing structure 1022 to form a mechanical linear seal or a mechanical surface seal.

[0046] Specifically, the inner peripheral wall of the spindle 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, and the transition surface between the first hole section and the second hole section has the first contact sealing structure 1022. The spindle 7 has a first shaft section 704 and a second shaft section 705, the outer diameter of the first shaft section 704 and the outer diameter of 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, and the transition surface between the first shaft section 704 and the second shaft section 705 has the second contact sealing structure 701. Under the above conditions, the first contact sealing structure 1022 is in contact with 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 spindle 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 spindle 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 tapered surface gradually converging towards the inside of the cylinder 1, and the first tapered 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 tapered surface gradually converging towards the inside of the cylinder 1, and the second tapered surface constitutes the second contact sealing structure 701.

[0048] Of course, to further avoid the gas in the cylinder cavity from flowing out from the adjacent spindle 7 when the cylinder cavity is filled with gas, a sealing ring 703 can be arranged 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 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 spindle 7.

[0049] To enable the second contact sealing structure 701 to contact the first contact sealing structure 1022 and form a mechanical wire seal or a mechanical face seal, the mandrel 7 has a third shaft section 706 provided 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 that of the second shaft section 705, the third shaft section 706 is externally sleeved with a spring 702, one end of the spring 702 abuts against the transition surface between the third shaft section 706 and the second shaft section 705. The shaft hole 1021 is provided with a cover 8 on the side close to the outside of the cylinder 1, the cover 8 abuts against the other end of the spring 702. The outer peripheral wall of the third shaft section 706 is in clearance fit with the inner peripheral wall of the shaft hole 1021.

[0050] Specifically, the cover 8 is provided with a through hole 801 for the mandrel 7 to pass through, the inner peripheral wall of the through hole 801 has a third hole section and a fourth hole section, the third hole section is provided 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 that 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. The inner peripheral wall of the through hole 801 is in clearance fit with the outer peripheral wall of the mandrel 7.

[0051] By providing the mandrel 7 on the cylinder end cover 102, the cylinder piston 101 triggers the reversing trigger device 2 through the mandrel 7, so that the reversing trigger device 2 is provided separately from the cylinder end cover 102, facilitating the maintenance and replacement of the reversing trigger device 2. By providing the mandrel 7 on the cylinder end cover 102 to trigger the proximity switch 205, instead of providing a magnetic ring on the cylinder piston 101 to trigger the proximity switch 205, the problem of the magnetic ring affecting the use of the metal body outside the cylinder 1 and the problem of the magnetic ring being damaged and not easy to maintain and replace are avoided. By providing the first contact sealing structure 701 and the second contact sealing structure 1022, the second contact sealing structure 701 contacts the first contact sealing structure 1022 and forms a mechanical wire seal or a mechanical face seal before the mandrel 7 is jolted by the cylinder piston 101, so that a sealing ring can be omitted between the outer peripheral wall of the mandrel 7 and the inner peripheral wall of the shaft hole 1021, avoiding the sealing ring blocking the gap between the outer peripheral wall of the mandrel 7 and the inner peripheral wall of the shaft hole 1021 during the process of the mandrel 7 being jolted by the cylinder piston 101 to trigger the reversing trigger device 2, thereby avoiding affecting the triggering of the reversing trigger device 2, and further avoiding the phenomenon of the reversing valve 3 being stuck.

[0052] The hydraulic station further comprises a hydraulic oil pump 19 for drawing hydraulic oil from the oil tank 18 through a second oil supply line 22 to supply the actuator 13, and a pressure detecting device for detecting the inlet pressure of the directional valve 3 or the outlet oil pressure of the oil cylinder 4. The hydraulic oil pump 19 is started when the pressure detecting device detects that the inlet pressure or the oil pressure is reduced to a first set value. The first oil supply line 10 is provided with a first check valve 15 to prevent hydraulic oil in the second oil supply line 22 from entering the first oil supply line 10. The second oil supply line 22 is provided with a second check valve 23 to prevent hydraulic oil in the first oil supply line 10 from entering the second oil supply line 22.

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

[0054] The pressure detecting device is arranged on the line between the first check valve 15 and the oil cylinder 4 on the first oil supply line 10 to detect the outlet oil pressure of the oil cylinder 4. Alternatively, the pressure detecting device is arranged on the inlet pipe 12 of the directional valve 3 to detect the inlet pressure of the directional valve 3. The pressure detecting device comprises a pressure switch 24 and a pressure sensor 27.

[0055] The pressure detecting device is closed or sends a signal to start the hydraulic oil pump 19, i.e. to start the motor 32 of the hydraulic oil pump 19, when it detects that the inlet pressure of the directional valve 3 or the outlet oil pressure of the oil cylinder 4 is lower than the first set value. 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 or 6 MPa, according to the requirements.

[0056] The pressure detecting device is opened when it detects that the inlet pressure of the directional valve 3 or the outlet oil pressure of the oil cylinder 4 rises to the first set value and continues to be closed for a set time, so as to stop the hydraulic oil pump 19, i.e. to stop the motor 32 of the hydraulic oil pump 19, to avoid frequent starting of the motor 32 of the hydraulic oil pump 19. The set time can be set to 30 s. The set time can also be set to other times, such as 40 s or 50 s, according to the requirements.

[0057] The pressure detection device can be a pressure switch with two set values, a lower limit set value and an upper limit set value. The pressure switch is opened when the pressure is lower than the lower limit set value, and the pressure switch is closed when the pressure is higher than the upper limit set value. 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 the specific setting is based on the demand.

[0058] When the pressure detection device detects that the inlet pressure of the reversing valve 3 or the outlet oil pressure of the oil cylinder 4 rises to the second set value, it is opened or a signal is sent, so that the hydraulic oil pump 19 is stopped, that is, the motor 32 of the hydraulic oil pump 19 stops working. 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 the specific setting is based on the demand. The second set value is also greater than the above-mentioned upper limit set value. For example, when the above-mentioned 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 the specific setting is based on the demand.

[0059] The hydraulic station further comprises an energy storage device 9 arranged on the first oil supply pipeline 10. The energy storage device 9 is arranged on the pipeline between the first one-way valve 15 and the oil cylinder 4 on the first oil supply pipeline 10. The communication between the energy storage device 9 and the first oil supply pipeline 10 is provided with a pressure detection device, such as a pressure switch.

[0060] The hydraulic station further comprises a controller, which 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 a pressure switch 24, the controller comprises a first AC contactor 25 arranged on the motor power supply circuit of the hydraulic oil pump 19, and the coil power supply circuit of the first AC contactor 25 is provided with a pressure switch 24. 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 between the positive and negative electrodes of the 24V power supply 34. The first air switch 26 is arranged at the inlet of the first AC contactor 25.

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

[0063] In conclusion, the utility model discloses a pressure detection device is arranged to detect whether the inlet pressure of reversing valve 3 or the outlet oil pressure of oil cylinder 4 reduces to the first set value, realizes the detection of whether the oil supply of oil cylinder 4 stops, also sets up hydraulic oil pump 19, and when the pressure detection device detects that the inlet pressure of reversing valve 3 or the outlet oil pressure of oil cylinder 4 reduces to the first set value, starts, realizes the oil supply of oil cylinder 4 stops and uses hydraulic oil pump 19 to supply oil, to realize the continuous oil supply.

[0064] The same or similar reference numerals in the drawings of the embodiment correspond to the same or similar components; in the description of the utility model, it is understood that if the orientation or position relationship indicated by the terms "upper", "lower", "left", "right" and the like is based on the orientation or position relationship shown in the drawings, only for the convenience of describing the utility model and simplifying the description, and not indicating or implying that the indicated device or element must have a particular orientation, structure and operation, therefore the position relationship description term in the drawings is only used for example, and can not be understood as the limitation of the patent, for the ordinary skilled in the art, can understand the specific meaning of the above terms according to the specific situation.

[0065] The above only is the preferred embodiment of the utility model, and does not limit the utility model, and any modification, equivalent replacement and improvement, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A hydraulic station comprising a pneumatic cylinder, a reversing trigger device capable of sending a cylinder piston movement to position signal of the pneumatic cylinder, a reversing valve capable of switching the intake and exhaust of two cylinder cavities of the pneumatic cylinder according to the signal of the reversing trigger device, an oil cylinder linked with the pneumatic cylinder, the oil cylinder being capable of extracting hydraulic oil from an oil tank to supply an actuator through a first oil supply pipeline under the drive of the pneumatic cylinder; characterized in that, The hydraulic oil pump draws hydraulic oil from the tank through a second oil supply line to supply the actuator, and a pressure detection device is provided for detecting the intake pressure of the reversing valve or the oil pressure at the outlet of the oil cylinder; the first oil supply line is provided with a first check valve to prevent hydraulic oil in the second oil supply line from entering the first oil supply line; the hydraulic oil pump is started when the pressure detection device detects that the intake pressure or the oil pressure has dropped to a first set value.

2. The hydraulic station of claim 1, wherein, The pressure detection device is arranged on the first oil supply line between the first check valve and the oil cylinder.

3. The hydraulic station of claim 1, wherein, The pressure detection device is arranged on the intake pipe of the reversing valve.

4. The hydraulic station of claim 1, wherein, The pressure detection device comprises a pressure switch or a pressure sensor.

5. The hydraulic station of claim 1, wherein, The hydraulic oil pump is stopped when the pressure detection device detects that the intake pressure or the oil pressure has risen to the first set value and continues to remain closed for a set time.

6. The hydraulic station of claim 1, wherein, The hydraulic oil pump is stopped when the pressure detection device detects that the intake pressure or the oil pressure has risen to a second set value, wherein the second set value is greater than the first set value.

7. The hydraulic station of claim 1, wherein, The second oil supply line is provided with a second check valve to prevent hydraulic oil in the first oil supply line from entering the second oil supply line.

8. The hydraulic station of claim 1, wherein, An accumulator is arranged on the first oil supply line.

9. The hydraulic station of claim 8, wherein, The accumulator is arranged on the first oil supply line between the first check valve and the oil cylinder.

10. The hydraulic station according to any one of claims 1 to 9, characterized in that, A controller is further provided, which controls the starting or stopping of the hydraulic oil pump according to the pressure signal detected by the pressure detection device.

Images