Hydraulic station

Abstract

The utility model discloses a hydraulic station which comprises an air cylinder, a reversing trigger device and a reversing valve, wherein the reversing trigger device can send out a signal that an air cylinder piston of the air cylinder moves in place, and the reversing valve is used 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. The hydraulic station further comprises a mandrel, the mandrel penetrates through an end cover of the air cylinder in a sliding and sealing mode, the first end and the second end of the mandrel in the sliding direction extend into and out of the air cylinder respectively, the first end is jacked by an air cylinder piston of the air cylinder, and the second end triggers the reversing trigger device. The mandrel is arranged on the air cylinder end cover, the air cylinder piston triggers the reversing trigger device through the mandrel, and therefore the reversing trigger device and the air cylinder end cover are arranged in a split mode, and maintenance and replacement of the reversing trigger device are facilitated.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic power units, and in particular to a hydraulic power unit. Background Technology

[0002] A hydraulic power unit 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 hydraulically driven actuators.

[0003] See Figure 1 This is a schematic diagram of a hydraulic station provided in the prior art. As shown in the figure, the hydraulic station includes: a linked cylinder 1' and an oil cylinder 2'; wherein, the cylinder end caps on both sides of cylinder 1' are respectively provided with a first reversing trigger device 3' and a second reversing trigger device 4', and cylinder 1' is connected to a pneumatically controlled reversing valve 5', with the air source connected to the air inlet of the first reversing trigger device 3', the second reversing trigger device 4', and the pneumatically controlled reversing valve 5'; the working port A' of the pneumatically controlled reversing valve 5' is connected to one side of cylinder 1', and the working port B' of the pneumatically controlled reversing valve 5' is connected to cylinder 1'. The other side is connected; the first reversing trigger device 3' is connected to the pneumatic reversing valve 5' to control the pneumatic reversing valve 5' to start the working port A' of the pneumatic reversing valve 5' so that the working port A' of the pneumatic reversing valve 5' is connected to the air inlet P' of the pneumatic reversing valve 5'; the second reversing trigger device 4' is connected to the pneumatic reversing valve 5' to control the pneumatic reversing valve 5' to start the working port B' of the pneumatic reversing valve 5' so that the working port B' of the pneumatic reversing valve 5' is connected to the air inlet P' of the pneumatic reversing valve 5'.

[0004] The working process of the above hydraulic station is as follows: When the pneumatic piston is located on the left side of cylinder 1', the first reversing trigger device 3' is triggered to open, pushing the pneumatic reversing valve 5' to reverse. Compressed air enters cylinder 1' from working port A', specifically into the space to the left of the pneumatic piston, thus pushing the pneumatic piston to the right (the first reversing trigger device 3' is reset and cut off), driving the cylinder piston in oil cylinder 2' to the right; when the pneumatic piston moves to the right side of cylinder 1', the second reversing trigger device 4' is triggered to open, pushing the pneumatic reversing valve 5' to reverse, compressing... Air enters cylinder 1' through port B', specifically into the space to the right of the pneumatic piston, thus pushing the pneumatic piston to the left (the second reversing trigger device 4' is reset and cut off), which in turn drives the piston in cylinder 2' to the left, causing hydraulic oil to flow in and out. Cylinder 1' reciprocates to generate hydraulic output. When the set pressure is reached, cylinder 1' stops moving to maintain a constant pressure. Cylinder 1' remains in a pressurized state and stops moving, thus no longer consuming compressed air. Compared to traditional hydraulic stations, this reduces energy consumption and heat generation, achieving energy saving.

[0005] In the aforementioned energy-saving hydraulic station, the reversing trigger device is integrated with the cylinder end cover, making maintenance and replacement extremely inconvenient if the reversing trigger device malfunctions. Utility Model Content

[0006] This utility model provides a hydraulic station that makes the maintenance and replacement of the reversing trigger device more convenient.

[0007] An embodiment of this utility model provides a hydraulic power unit, including a cylinder, a reversing trigger device that can send a signal indicating that the cylinder piston has moved to the correct position, and a reversing valve that switches the intake and exhaust of the two cylinder chambers of the cylinder according to the signal from the reversing trigger device. The hydraulic power unit also includes a spindle, which is slidably and sealingly mounted on the end cover of the cylinder. A first end and a second end of the spindle extend into and out of the cylinder, respectively, so that the first end is pushed by the cylinder piston, and the second end triggers the reversing trigger device.

[0008] In some embodiments, the end cap has a shaft hole for the mandrel to pass through, and the inner peripheral wall of the shaft hole has a first contact sealing structure. The outer peripheral wall of the mandrel has a second contact sealing structure, which is located on the side of the first contact sealing structure near the outside of the cylinder. The second contact sealing structure can contact the first contact sealing structure to form a mechanical line seal or a mechanical surface seal.

[0009] In some embodiments, the inner peripheral wall of the shaft hole has a first hole section and a second hole section. The first hole section is located on the side of the second hole section closer to the cylinder. The inner diameter of the first hole section is smaller than the inner diameter of the second hole section. The transition surface between the first hole section and the second hole section has a first contact sealing structure. The mandrel has a first shaft section and a second shaft section. The outer diameters of the first shaft section and the second shaft section are respectively clearance-fitted with the inner diameters of the first hole section and the second hole section. The transition surface between the first shaft section and the second shaft section has a second contact sealing structure.

[0010] In some embodiments, the transition surface between the first and second bore segments includes a first annular plane perpendicular to the centerline of the shaft bore, the first annular plane constituting a first contact seal structure. The transition surface between the first and second shaft segments includes a second annular plane perpendicular to the centerline of the mandrel, the second annular plane constituting a second contact seal structure.

[0011] In some embodiments, the transition surface between the first bore segment and the second bore segment includes a first conical surface that gradually tapers towards the cylinder, the first conical surface constituting a first contact sealing structure. The transition surface between the first shaft segment and the second shaft segment includes a second conical surface that gradually tapers towards the cylinder, the second conical surface constituting a second contact sealing structure.

[0012] In some embodiments, the mandrel has a third shaft segment disposed on the side of the second shaft segment near the outside of the cylinder. The outer diameter of the third shaft segment is smaller than that of the second shaft segment. A spring is fitted around the outside of the third shaft segment, with one end of the spring abutting against the transition surface between the third and second shaft segments. A cap is installed on the side of the shaft hole near the outside of the cylinder, with the cap abutting against the other end of the spring.

[0013] In some embodiments, the cover has a through hole for the mandrel to pass through. The inner peripheral wall of the through hole has a third hole section and a fourth hole section. The third hole section is located on the side of the fourth hole section near the cylinder. 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.

[0014] In some embodiments, a sealing ring is provided between the outer peripheral wall of the second shaft segment and the inner peripheral wall of the second hole segment.

[0015] In some embodiments, the reversing trigger is an electrically controlled valve or a pneumatically controlled valve. The electrically controlled valve includes a contact switch or a proximity switch.

[0016] In some embodiments, the hydraulic station further includes an auxiliary exhaust valve, which has an auxiliary exhaust port and two exhaust control ports. One exhaust control port of the auxiliary exhaust valve is simultaneously connected to one cylinder chamber of the main cylinder and one working port of the main directional valve. The other exhaust control port of the auxiliary exhaust valve is simultaneously connected to another cylinder chamber of the main cylinder and another working port of the main directional valve. When air is introduced into one cylinder chamber of the main cylinder, the auxiliary exhaust port connects the other cylinder chamber of the main cylinder to the outside.

[0017] A hydraulic power unit according to an embodiment of this utility model includes a cylinder, a reversing trigger device that can send a signal indicating that the cylinder piston has moved to the correct position, and a reversing valve that switches the intake and exhaust of the two cylinder chambers of the cylinder according to the signal from the reversing trigger device. The hydraulic power unit also includes a spindle, which is slidably and sealingly mounted on the end cover of the cylinder. A first end and a second end of the spindle extend into and out of the cylinder, respectively, so that the first end is actuated by the cylinder piston, and the second end triggers the reversing trigger device. This utility model, by setting the spindle on the cylinder end cover, allows the cylinder piston to trigger the reversing trigger device via the spindle, thus separating the reversing trigger device from the cylinder end cover, facilitating the maintenance and replacement of the reversing trigger device. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

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

[0020] Figure 2 A schematic diagram of the connection structure of the hydraulic cylinder, air cylinder, reversing trigger device, reversing valve and auxiliary exhaust valve in the hydraulic station provided in the embodiment of this utility model;

[0021] Figure 3 A schematic diagram of the structure of the auxiliary exhaust valve in the hydraulic station provided in this embodiment of the utility model;

[0022] Figure 4 A schematic diagram of the structure of the pneumatic control valve and mandrel in the hydraulic station provided in this embodiment of the utility model;

[0023] Figure 5 A schematic diagram of the structure of the contact switch, spindle, and directional valve in the hydraulic station provided in this embodiment of the utility model;

[0024] Figure 6 This is a schematic diagram of the structure of the contact switch and spindle in the hydraulic station provided in an embodiment of the present utility model;

[0025] Figure 7 A schematic diagram of the proximity switch, spindle, and directional valve in a hydraulic station provided in this embodiment of the utility model;

[0026] Figure 8 This is a schematic diagram of the proximity switch and spindle in a hydraulic station provided in an embodiment of the present invention;

[0027] Figure 9 A schematic diagram of the connection between the proximity switch and the directional valve in the hydraulic station provided for an embodiment of this utility model;

[0028] Figure 10 This is a schematic diagram of the structure of the mandrel in the hydraulic station provided in an embodiment of the present utility model. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model 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 merely illustrative of the present utility model and are not intended to limit the present utility model.

[0030] See Figure 2-10 The present invention provides a hydraulic station, including a cylinder 1, a reversing trigger device 2 that can send a signal that the cylinder piston has moved to the position, and a reversing valve 3 that switches the intake and exhaust of the two cylinder chambers of the cylinder according to the signal of the reversing trigger device.

[0031] Cylinder 1 has a cylinder body, a cylinder piston 101, and a cylinder end cap 102. The cylinder piston 101 can slide along the inner wall of the cylinder body and form an air seal with the inner wall of the cylinder body. The cylinder end cap 102 is located at both ends of the cylinder body to seal the cylinder body. The cylinder piston 101 has two cylinder chambers on both sides. When air enters one cylinder chamber of the cylinder piston 101, air exits from the other cylinder chamber, causing the cylinder piston 101 to move back and forth between the two ends under air pressure. The cylinder piston 101 of cylinder 1 is connected to the hydraulic piston 401 of hydraulic cylinder 4 by a linkage rod 5. The linkage rod 5 slidably passes through the cylinder end cap 102 located near hydraulic cylinder 4 in cylinder 1, so that the cylinder piston 101 and hydraulic piston 401 slide synchronously.

[0032] There are two reversing trigger devices 2, namely a first reversing trigger device and a second reversing trigger device. The first reversing trigger device and the second reversing trigger device are respectively located at both ends of the cylinder 1, so as to obtain whether the cylinder piston 101 of the cylinder 1 has moved to the two ends in place, and can issue a corresponding move-in signal when the cylinder piston 101 moves to the two ends in place.

[0033] The first reversing trigger device and the second reversing trigger device can both be pneumatically controlled valves, referred to as the first pneumatically controlled valve block 201 and the second pneumatically controlled valve block 202, respectively. The valve body of the first pneumatically controlled valve block 201 is provided with a first air inlet E and a first exhaust port C. The first air inlet E is connected to the air source 11, and the first exhaust port C is connected to the first control port Y1 of the pneumatic reversing valve 301. The valve body of the first pneumatically controlled valve block 201 is provided with a valve core that can move to the left under pressure and to the right under elasticity. When the valve core of the first pneumatically controlled valve block 201 moves to the left position, the first air inlet E and the first exhaust port C are connected. The starting block part of the valve core of the first pneumatically controlled valve block 201 protrudes from the right end of the valve body of the first pneumatically controlled valve block 201 and is pushed by the cylinder piston 101. Under the above conditions, when the cylinder piston 101 moves to the left under air pressure, it triggers the actuation block of the first pneumatic control valve block 201. The valve core of the first pneumatic control valve block 201 then moves to the left until the first air inlet E and the first exhaust port C are connected, thus connecting the air source 11 and the first control port Y1, thereby pressurizing the gas into the first control port Y1. During this process, the activation block of the first pneumatic control valve block 201 is determined to indicate whether the cylinder piston 101 has moved to the left, and a signal indicating that the piston has moved to the left is sent by pressurizing the gas into the first control port Y1. The valve body of the second pneumatic control valve block 202 is provided with a second air inlet F and a second exhaust port D. The second air inlet F is connected to the air source 11, and the second exhaust port D is connected to the second control port Z1 of the pneumatic reversing valve 301. The valve body of the second pneumatic control valve block 202 is provided with a valve core that can move to the right under pressure and to the left under elasticity. When the valve core of the second pneumatic control valve block 202 moves to the right, the second air inlet F and the second exhaust port D are connected. The starting block part of the valve core of the second pneumatic control valve block 202 protrudes from the left end of the valve body of the second pneumatic control valve block 202 and is pushed by the cylinder piston 101. Under the above conditions, when the cylinder piston 101 moves to the right under the action of air pressure, it triggers the actuation block of the valve core of the second pneumatic control valve block 202. The valve core of the second pneumatic control valve block 202 moves to the right until the second air inlet F and the second exhaust port D are connected, thus connecting the air source 11 and the second control port Z1, thereby pressurizing the gas into the second control port Z1. In the above process, by determining whether the actuation block of the valve core of the second pneumatic control valve block 202 is triggered, it is determined whether the cylinder piston 101 has moved to the right. By pressurizing the gas into the second control port Z1, a signal indicating that the piston has moved to the right is sent.

[0034] The first reversing trigger device and the second reversing trigger device can both be electrically controlled valves, referred to as the first electrically controlled valve and the second electrically controlled valve, respectively. Both the first electrically controlled valve and the second electrically controlled valve can include a contact switch 204. The housing of the contact switch 204 contains a first spring 2041, a second spring 2042, a first terminal 2043, and a second terminal 2044. The first spring 2041 is spaced at a preset distance from the second spring 2042 and is activated to contact the second spring 2042. The first terminal 2043 is electrically connected to the first spring 2041, and the second terminal 2044 is electrically connected to the second spring 2042. The housing of the contact switch 204 has a wire outlet 2045 and a guide post 2046. The wire outlet 2045 allows the wires connected to the first terminal 2043 and the second terminal 2044 to be led out. The guide post 2046 can activate the first spring 2041 and be actuated by the cylinder piston 101. Both the first and second electrically controlled valves may include a proximity switch 205. The proximity switch 205 activates when it senses a metal detector. The proximity switch 205 is connected to a circuit controller 9, which is connected to the electrically controlled directional valve 302 and the power supply 10.

[0035] The reversing valve 3 is connected to the first reversing trigger device and the second reversing trigger device respectively, so as to sequentially switch the intake and exhaust of the two cylinder chambers of the cylinder according to the signals sent by the first reversing trigger device and the second reversing trigger device.

[0036] The reversing valve 3 can be a pneumatically controlled reversing valve 301. The pneumatically controlled reversing valve 301 has a first control port Y1, a second control port Z1, a first working port A1, a second working port B1, a third inlet port P1, a third exhaust port R11, and a fourth exhaust port R12. The first control port Y1 is connected to the first exhaust port C of the first pneumatically controlled valve block 201, the second control port Z1 is connected to the second exhaust port D of the second pneumatically controlled valve block 202, the first working port A1 is connected to the cylinder cavity on the left side of the cylinder piston 101 of cylinder 1, the second working port B1 is connected to the cylinder cavity on the right side of the cylinder piston 101, the third inlet port P1, the second working port B1, the third inlet port P1, the third exhaust port R11, and the fourth exhaust port R12. Air port P1 is connected to air source 11. The valve body of the pneumatic reversing valve 301 is provided with a valve core that can move to the right under the action of air pressure in the first control port Y1 and to the left under the action of air pressure in the second control port Z1. When the valve core of the pneumatic reversing valve 301 moves to the right, the first working port A1 is connected to the third air inlet P1 and the second working port B1 is connected to the fourth exhaust port R12. When the valve core of the pneumatic reversing valve 301 moves to the left, the second working port B1 is connected to the third air inlet P1 and the first working port A1 is connected to the third exhaust port R11. Under the above conditions, after gas is pressurized into the first control port Y1, the valve core of the pneumatic reversing valve 301 moves to the right until the first working port A1 connects with the third air inlet port P1 to achieve air intake, and the second working port B1 connects with the fourth exhaust port R12 to achieve exhaust. This allows air to enter the cylinder chamber on the left side of the cylinder piston 101 and exhaust from the cylinder chamber on the right side, causing the cylinder piston 101 to move to the right under the action of air pressure. After gas is pressurized into the second control port Z1, the valve core of the pneumatic reversing valve 301 moves to the left until the second working port B1 connects with the third air inlet port P1 to achieve air intake, and the first working port A1 connects with the third exhaust port R11 to achieve exhaust. This allows air to enter the cylinder chamber on the right side of the cylinder piston 101 and exhaust from the cylinder chamber on the left side, causing the cylinder piston 101 to move to the left under the action of air pressure. In the above process, the reversing valve 301 sequentially switches the air intake and exhaust of the two cylinder chambers of the cylinder according to the gas pressurization into the first control port Y1 and the second control port Z1.

[0037] The reversing valve 3 can be an electrically controlled reversing valve, such as a two-position five-way solenoid valve. The electrically controlled reversing valve 302 has 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 connected to the first and second electrically controlled valves, respectively. The third working port A2 is connected to the cylinder cavity on the left side of the cylinder piston 202 of cylinder 2, and the fourth working port B2 is connected to the cylinder cavity on the right side of the cylinder piston 202. The fourth air inlet P2 is connected to the air source 2. 2. The electrically controlled directional valve 302 body is equipped with an electrically controlled directional valve core that can move to the right under the control of the first relay terminal Y2 and to the left under the control of the second relay terminal Z2. When the electrically controlled directional valve core moves to the right, the third working port A2 is connected to the fourth air inlet P2, and the fourth working port B2 is connected to the sixth exhaust port R22. When the electrically controlled directional valve core moves to the left, the fourth working port B2 is connected to the fourth air inlet P2, and the third working port A2 is connected to the fifth exhaust port R21.

[0038] The hydraulic cylinder may also include an auxiliary exhaust valve 6, which has an auxiliary exhaust port and two exhaust control ports. One exhaust control port of the auxiliary exhaust valve 6 is simultaneously connected to one cylinder chamber of the cylinder 1 and one working port of the directional valve 3. The other exhaust control port of the auxiliary exhaust valve 6 is simultaneously connected to another cylinder chamber of the cylinder 1 and another working port of the directional valve 3. When air is introduced into one cylinder chamber of the cylinder 1, the auxiliary exhaust port connects the other cylinder chamber of the cylinder 1 to the outside.

[0039] The auxiliary exhaust valve 6 includes an auxiliary exhaust valve body 601 and an auxiliary exhaust valve core 602. The auxiliary exhaust valve body 601 is a hollow structure, and has 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 connected to the cylinder cavity on one side of the cylinder piston 101 of cylinder 1 and the first working port A1 of the reversing valve 3. The second exhaust control port H is simultaneously connected to 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 connected to the outside. The auxiliary exhaust valve core 602 is slidably disposed within the auxiliary exhaust valve body 601. Under the action of air pressure in the first exhaust control port G, it slides to a first position, so that the first exhaust control port G is not connected to the auxiliary exhaust port S, and the second exhaust control port H is connected to the auxiliary exhaust port S. Under the action of air pressure in the second exhaust control port H, it slides to a second position, so that the first exhaust control port G is connected to the auxiliary exhaust port S, and the second exhaust control port H is not connected to the auxiliary exhaust port S. The first exhaust control port G and the second exhaust control port H are respectively located at the left and right ends of the auxiliary exhaust valve body 601. The auxiliary exhaust port S is located on the upper part of the auxiliary exhaust valve body 601 and is positioned in the middle of the auxiliary exhaust valve body 601. A muffler 609 is installed at the auxiliary exhaust port. Under the above conditions, after air enters through the first working port A1, air enters the cylinder cavity on the left side of the cylinder piston 101. The gas is pressurized into the first exhaust control port G, the auxiliary exhaust valve 6 moves to the right, and the second exhaust control port H connects with the auxiliary exhaust port S to achieve 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 air enters through the second working port B1, air enters the cylinder cavity on the right side of the cylinder piston 101. The gas is pressurized into the second exhaust control port H, the auxiliary exhaust valve 6 moves to the left, and the first exhaust control port G connects with the auxiliary exhaust port S to achieve 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.

[0040] The auxiliary exhaust valve body 601 is provided with a first limiting plate 603 and a second limiting plate 604. The first limiting plate 603 and the second limiting plate 604 are respectively disposed at a first position and a second position, and are connected to the inner wall of the auxiliary exhaust valve body 601, so that the first limiting plate 603 and the second limiting plate 604 slide and limit the auxiliary exhaust valve core 602. The first limiting plate 603 and the second limiting plate 604 are symmetrically arranged.

[0041] An auxiliary exhaust valve body 601 has a protrusion 605 with an auxiliary exhaust port S. An auxiliary exhaust valve core 602 is located at the protrusion 605, and there is a gap between the inner wall of the protrusion 605 and the outer wall of the auxiliary exhaust valve core 602. The outer wall of the auxiliary exhaust valve core 602 has a first sealing part 606 and a second sealing part 607. The first sealing part 606 is located outside the protrusion 605 and spaced a certain distance from the inner wall of the auxiliary exhaust valve body 601 when the auxiliary exhaust valve core 602 slides to the first position. The second sealing part 607 is located inside the protrusion 605 and seals the gap between the outer wall of the auxiliary exhaust valve core 602 and the inner wall of the protrusion 605 when the auxiliary exhaust valve core 602 slides to the first position. The first sealing part 606 is located inside the protrusion 605 and seals the gap between the outer wall of the auxiliary exhaust valve core 602 and the inner wall of the protrusion 605 when the auxiliary exhaust valve core 602 slides to the second position. The protrusion 605 seals the gap between the outer wall of the auxiliary exhaust valve core 602 and the inner wall of the protrusion 605. The second sealing part 607 is located outside the protrusion 605 when the auxiliary exhaust valve core 602 slides to the second position, and is spaced a certain distance from the inner wall of the auxiliary exhaust valve body 601. This ensures that when the auxiliary exhaust valve core 602 slides to the first position, the first exhaust control port G is not connected to the auxiliary exhaust port S, and the second exhaust control port H connects to the auxiliary exhaust port S through the gap between the outer wall of the auxiliary exhaust valve core 602 and the inner wall of the auxiliary exhaust valve body 601. When the auxiliary exhaust valve core 602 slides to the second position, the first exhaust control port G connects to the auxiliary exhaust port S through the gap between the outer wall of the auxiliary exhaust valve core 602 and the inner wall of the auxiliary exhaust valve body 601, and the second exhaust control port H does not connect to the auxiliary exhaust port S. The protrusion 605 is arranged around the center line of the auxiliary exhaust valve body 601. The protrusion 605 is located at the middle position of the auxiliary exhaust valve body 601. The first sealing part 606 and the second sealing part 607 are both arranged around the center line of the auxiliary exhaust valve core 606. The first sealing part 606 and the second sealing part 607 are symmetrically arranged. Both the first sealing part 606 and the second sealing part 607 are sealing rings. The first sealing part 606 and the second sealing part 607 are both embedded in the outer wall of the auxiliary exhaust valve core 602.

[0042] A recessed portion 608 is provided on the outer wall of the auxiliary exhaust valve core 602. The recessed portion 608 is located between the first sealing portion 606 and the second sealing portion 607. When the auxiliary exhaust valve core 602 slides to the first position, one end of the recessed portion 608 near the first sealing ring 606 is located outside the protrusion 605, and the other end near the second sealing ring 607 is located inside the protrusion 605. When the auxiliary exhaust valve core 602 slides to the second position, one end near the second sealing ring 607 is located outside the protrusion 605, and the other end near the first sealing ring 606 is located outside the protrusion 605. This allows the recessed portion 608 to assist in connecting the first exhaust control port G and the auxiliary exhaust port S when the auxiliary exhaust valve core 602 slides to the first position; and to assist in connecting the second exhaust control port H and the auxiliary exhaust port S when the auxiliary exhaust valve core 602 slides to the second position. The recessed portion 608 is arranged around the centerline of the auxiliary exhaust valve core 602. The recess 608 is located in the middle of the auxiliary exhaust valve core 602.

[0043] The hydraulic station also includes a spindle 7, which is slidably and sealingly mounted on the cylinder end caps 102. A first end and a second end of the spindle 7 extend into and out of the cylinder 1 in its sliding direction, respectively. The first end is actuated by the cylinder piston 101 of the cylinder 1, and the second end triggers the reversing trigger device 2. Specifically, the spindle 7 is slidably and sealingly mounted on the two end caps 102 of the cylinder 1. A first end and a second end of the spindle 7 extend into and out of the cylinder 1 in its sliding direction, respectively. The first end is actuated by the cylinder piston 101 of the cylinder 1, and the second end triggers the first and second reversing trigger devices.

[0044] To prevent gas from leaking out of the adjacent mandrel 7 during cylinder intake, the cylinder end cover 102 has a shaft hole 1021 for the mandrel 7 to pass through. 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, which is located on the side of the first contact sealing structure 1022 near 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 actuated 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.

[0045] 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 located on the side of the second hole section closer to the cylinder 1. The inner diameter of the first hole section is smaller than the inner diameter 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 spindle 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 clearance-fitted with the inner diameters of the first hole section and 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 and forms a mechanical surface seal.

[0046] To form the first contact sealing structure 1022 and the second contact sealing structure 701, the transition surface between the first bore segment and the second bore segment includes a first annular plane perpendicular to the centerline of the shaft bore 1021, and the first annular plane constitutes the first contact sealing structure 1022. The transition surface between the first shaft segment 704 and the second shaft segment 705 includes a second annular plane perpendicular to the centerline of the spindle 7, and the second annular plane constitutes the second contact sealing structure 701. The transition surface between the first bore segment and the second bore segment includes a first conical surface that gradually tapers towards the cylinder 1, and the first conical surface constitutes the first contact sealing structure 1022. The transition surface between the first shaft segment 704 and the second shaft segment 705 includes a second conical surface that gradually tapers towards the cylinder 1, and the second conical surface constitutes the second contact sealing structure 701.

[0047] Of course, to further prevent gas from leaking out of the adjacent spindle 7 during cylinder intake, 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 bore section. The outer peripheral wall of the second shaft section 705 has a groove, and the sealing ring 703 is embedded in the groove. There can be multiple sealing rings 703, such as two, arranged at a certain distance along the centerline of the spindle 7.

[0048] To allow 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 spindle 7 has a third shaft section 706. The third shaft section 706 is located on the side of the second shaft section 705 near 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 on the outside of the third shaft section 706, and 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 on the side of the shaft hole 1021 near the outside of the cylinder 1, and 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.

[0049] Specifically, the cover 8 has a through hole 801 for the mandrel 7 to pass through. The inner peripheral wall of the through hole 801 has a third section and a fourth section. The third section is located on the side of the fourth section closer to the cylinder 1. The inner diameter of the third section is larger than the inner diameter of the fourth section. The transition surface between the third and fourth sections abuts against the other end of the spring 702. The inner peripheral wall of the through hole 801 and the outer peripheral wall of the mandrel 7 are clearance-fitted.

[0050] In summary, this utility model has the following beneficial effects:

[0051] (1) This utility model provides a spindle 7 on the cylinder end cover 102 so that the cylinder piston 101 triggers the reversing trigger device 2 through the spindle 7, thereby separating the reversing trigger device 2 from the cylinder end cover 102, which facilitates the maintenance and replacement of the reversing trigger device 2.

[0052] (2) This utility model avoids the problem of magnetic ring attracting the metal body outside the cylinder 1, affecting the use, and the problem of magnetic ring damage being difficult to repair and replace by setting the spindle 7 to trigger the proximity switch 205 on the cylinder end cover 102 instead of setting the magnetic ring to trigger the proximity switch 205 on the cylinder piston 101.

[0053] (3) By setting a first contact sealing structure 701 and a second contact sealing structure 1022, the present invention enables the second contact sealing structure 701 to contact the first contact sealing structure 1022 and form a mechanical line seal or mechanical surface seal before the spindle 7 is pushed by the cylinder piston 101. This eliminates the need to set a sealing ring between the outer peripheral wall of the spindle 7 and the inner peripheral wall of the shaft hole 1021. This avoids the sealing ring blocking the gap between the outer peripheral wall of the spindle 7 and the inner peripheral wall of the shaft hole 1021 during the process of triggering the reversing triggering device 2 after the spindle 7 is pushed by the cylinder piston 101, thereby avoiding affecting the triggering of the reversing triggering device 2 and thus avoiding the reversing valve 3 from getting stuck.

[0054] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0055] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A hydraulic station comprising a cylinder, a commutation trigger device that can emit a cylinder piston movement to position signal of the cylinder, and a commutation valve that switches the intake and exhaust of two cylinder cavities of the cylinder according to the signal of the commutation trigger device; characterized in that, Further comprising a mandrel slidingly penetrating the end cover of the cylinder, the first end and the second end of the mandrel in the sliding direction thereof respectively extend to the inside and outside of the cylinder, the first end is driven by the cylinder piston of the cylinder, and the second end triggers the reversing trigger device.

2. The hydraulic station of claim 1, wherein, The end cover is provided with a shaft hole for the mandrel to penetrate, and the inner peripheral wall of the shaft hole has a first contact sealing structure; the outer peripheral wall of the mandrel has a second contact sealing structure, which is arranged on the side of the first contact sealing structure close to the outside of the cylinder, and can contact the first contact sealing structure to form a mechanical linear seal or a mechanical surface seal.

3. The hydraulic station of claim 2, wherein, The inner peripheral wall of the shaft hole 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, the inner diameter of the first hole section is smaller than the inner diameter 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; the mandrel has a first shaft section and a second shaft section, the outer diameter of the first shaft section and the outer diameter of the second shaft section 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 and the second shaft section has the second contact sealing structure.

4. The hydraulic station of claim 3, wherein, 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, and the first annular plane constitutes the first contact sealing structure; the transition surface between the first shaft section and the second shaft section includes a second annular plane perpendicular to the center line of the mandrel, and the second annular plane constitutes the second contact sealing structure.

5. The hydraulic station of claim 3, wherein, 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, and the first tapered surface constitutes the first contact sealing structure; the transition surface between the first shaft section and the second shaft section includes a second tapered surface gradually converging towards the inside of the cylinder, and the second tapered surface constitutes the second contact sealing structure.

6. The hydraulic station of claim 3, wherein, The mandrel has a third shaft section arranged on the side of the second shaft section close to the outside of the cylinder, the outer diameter of the third shaft section is smaller than the outer diameter of the second shaft section, a spring is sleeved on the outside of the third shaft section, one end of the spring abuts against the transition surface between the third shaft section and the second shaft section, and a cover is installed on the side of the shaft hole close to the outside of the cylinder, and the other end of the spring abuts against the cover.

7. The hydraulic station of claim 6, wherein, The cover is provided with a through hole for the mandrel to penetrate, and the inner peripheral wall of the through hole 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, the inner diameter of the third hole section is larger than the inner diameter of the fourth hole section, and the transition surface between the third hole section and the fourth hole section abuts against the other end of the spring.

8. The hydraulic station of claim 3, wherein, A sealing ring is arranged between the outer peripheral wall of the second shaft section and the inner peripheral wall of the second hole section.

9. The hydraulic station of claim 1, wherein, The reversing trigger device is an electrically controlled valve or a gas controlled valve; the electrically controlled valve includes a contact switch or a proximity switch.

10. The hydraulic station of claim 1, wherein, The exhaust valve further comprises an auxiliary exhaust valve having an auxiliary exhaust port and two exhaust control ports, one of the exhaust control ports of the auxiliary exhaust valve is in communication with one cylinder cavity of the cylinder and one working port of the reversing valve, the other exhaust control port of the auxiliary exhaust valve is in communication with the other cylinder cavity of the cylinder and the other working port of the reversing valve, and the auxiliary exhaust port is in communication with the other cylinder cavity of the cylinder and the outside when one cylinder cavity of the cylinder is in intake.

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