A hydraulic station

Abstract

The utility model discloses a hydraulic station, including cylinder, can send the reversing trigger structure of cylinder piston of cylinder and move to position signal, the signal switching valve structure of the two cylinder cavities of cylinder of reversing trigger structure according to cylinder air inlet and exhaust. Cylinder has two cylinder end plate, and the piston rod of oil cylinder piston of oil cylinder piston and oil cylinder are equipped with on a cylinder end plate. The hydraulic station still includes first mounting plate, and first mounting plate is attached to set in the one side of another cylinder end plate away from cylinder, and first mounting plate is equipped with reversing valve structure in. The utility model discloses a hydraulic station, cylinder and reversing valve structure are integrated setting, and the external connecting pipeline is saved, and it is favorable to later maintenance.

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 structure 5', with the air source connected to the air intake channels of the first reversing trigger device 3', the second reversing trigger device 4', and the pneumatically controlled reversing valve structure 5'; the working port A' of the pneumatically controlled reversing valve structure 5' is connected to one side of cylinder 1', and the working port B' of the pneumatically controlled reversing valve structure 5' is connected to the other side of cylinder 1'. The first reversing trigger device 3' is connected to the pneumatic reversing valve structure 5' to control the pneumatic reversing valve structure 5' to activate its A' working port, so that the A' working port of the pneumatic reversing valve structure 5' is connected to the P' air inlet channel of the pneumatic reversing valve structure 5'; the second reversing trigger device 4' is connected to the pneumatic reversing valve structure 5' to control the pneumatic reversing valve structure 5' to activate its B' working port, so that the B' working port of the pneumatic reversing valve structure 5' is connected to the P' air inlet channel of the pneumatic reversing valve structure 5'.

[0004] The working process of the hydraulic station described above is as follows: When the pneumatic piston is located on the left side of cylinder 1', it triggers the opening of the first reversing trigger device 3', pushing the pneumatic reversing valve structure 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' resets and closes), causing the oil piston in cylinder 2' to move to the right. When the pneumatic piston moves to the right side of cylinder 1', it triggers the opening of the second reversing trigger device 4', pushing the pneumatic reversing valve structure 5' to reverse. Compressed air enters cylinder 1' from 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] As is well known in the art, to avoid simultaneous exhaust from both cylinder chambers, the pneumatic directional valve structure 5' has an in-first-out characteristic, meaning that the connection port corresponding to the intake port connects first, while the connection port corresponding to the exhaust port connects with a delay. When the pneumatic valve core is pushed to the right, i.e., during the process of A' working port switching from intake to exhaust and B' working port switching from exhaust to intake, when the intake of A' working port is closed but the exhaust has not yet opened, the exhaust of B' working port closes. When the intake just opens, i.e., when B' working port just starts to receive air, and at the same time both intake and exhaust of A' working port are closed, due to the higher pressure in the chamber connected to A' working port, the chamber connected to B' working port receives air from B' working port, causing pressure in both cylinders. The pilot valve corresponding to the chamber connected to B' working port resets and closes, or the air source pressure decreases, resulting in a decrease in the air pressure pushing the pneumatic valve core to the right, causing the pneumatic directional valve to jam. If the directional valve gets stuck, the cylinder piston will stop moving, causing it to stop outputting hydraulic pressure. This results in the tooling losing pressure, leading to problems such as the workpiece not being clamped tightly or the tool colliding.

[0006] In addition, the existing cylinder and reversing valve structures are not integrated, and the external connecting pipes are messy, which is not conducive to later maintenance. Utility Model Content

[0007] This utility model provides a hydraulic station that can integrate cylinder and directional valve structures.

[0008] An embodiment of this utility model provides a hydraulic power unit, including a cylinder, a reversing trigger structure capable of issuing a signal indicating that the cylinder piston has moved to the correct position, and a reversing valve structure that switches the intake and exhaust of the two cylinder chambers of the cylinder according to the signal from the reversing trigger structure. The cylinder has two cylinder end plates, one of which has a piston rod connecting the cylinder piston and the hydraulic cylinder piston. The hydraulic power unit also includes a first mounting plate, which is fitted against the side of the other cylinder end plate opposite to the cylinder interior. The reversing valve structure is located within the first mounting plate.

[0009] In some embodiments, both working ports of the reversing valve structure are located on the side of the first mounting plate facing the cylinder. A first channel is provided within the other cylinder end plate, with its two ends respectively located on both sides of the other cylinder end plate, and one end of the first channel communicating with a working port. A second channel is provided within the side wall of the cylinder body, with its two ends respectively located on both ends of the cylinder body, and one end of the second channel communicating with the other end of the first channel. A third channel is provided within one cylinder end plate, with both ends located on the side of the first cylinder end plate facing the cylinder, and both ends of the third channel communicating with the other end of the second channel and the cylinder cavity at the first cylinder end plate, respectively. A fourth channel is provided within the other cylinder end plate, with its two ends respectively located on both sides of the other cylinder end plate, and both ends of the fourth channel communicating with another working port and the cylinder cavity on the other cylinder end plate side, respectively.

[0010] In some embodiments, the first mounting plate has an air intake channel, one end of which is connected to the air intake port of the reversing valve structure, and the other end is located on the side of the first mounting plate facing the cylinder. The control port of the reversing valve structure is located on the side of the first mounting plate facing the cylinder. A reversing trigger structure includes a first pneumatic control chamber, a first pneumatic control channel, and a second pneumatic control channel disposed in the end plate of another cylinder. The first pneumatic control chamber is connected to the cylinder cavity at the end plate of the other cylinder. One end of both the first and second pneumatic control channels is connected to the first pneumatic control chamber, and the other end is located on the side of the other cylinder end plate away from the cylinder, and is respectively connected to the other end of the air intake channel and the control port. A reversing trigger structure also includes a first actuating shaft disposed in the first pneumatic control chamber and extending into the cylinder cavity. When the cylinder piston actuates, the first actuating shaft connects the first pneumatic control channel and the second pneumatic control channel; when the cylinder piston is not actuated, it disconnects the connection between the first and second pneumatic control channels.

[0011] In some embodiments, another reversing trigger structure includes a second pneumatic control chamber, a third pneumatic control channel, and an exhaust channel disposed within a cylinder end plate. The second pneumatic control chamber communicates with the cylinder cavity at the cylinder end plate. One end of the third pneumatic control channel communicates with the second pneumatic control chamber, and the other end is disposed on the side of the cylinder end plate facing inward. One end of the exhaust channel communicates with the second pneumatic control chamber, and the other end is disposed on the side of the cylinder end plate facing outward. A reversing trigger structure also includes a second actuating shaft disposed within the second pneumatic control chamber and extending into the cylinder cavity. When the cylinder piston actuates, the second actuating shaft connects the third pneumatic control channel with the exhaust channel; when the cylinder piston is not actuated, it disconnects the third pneumatic control channel from the exhaust channel. A fifth channel is provided within another cylinder end plate. One end of the fifth channel communicates with the second pneumatic control channel, and the other end is disposed on the side of the other cylinder end plate facing inward. The cylinder body has a sixth channel inside its side wall. The two ends of the sixth channel are respectively located at the two ends of the cylinder body and are connected to the other end of the third pneumatic control channel and the other end of the fifth channel.

[0012] In some embodiments, the hydraulic station also includes a delay valve structure, which connects one working port to the outside when air is introduced into one working port of the directional valve structure and air is not discharged from the other working port, and connects the other working port to the outside when air is introduced into one working port and air is discharged from the other working port.

[0013] In some embodiments, the hydraulic station further includes a second mounting plate, which is fitted onto the side of another cylinder end plate opposite to the cylinder, and the second mounting plate is provided with a delay valve structure.

[0014] In some embodiments, the delay valve structure includes a delay channel disposed within a second mounting plate. The delay channel has a vent, a first connecting port, and a second connecting port. The vent communicates with the outside, the first connecting port communicates with a working port of a reversing valve structure, and the second connecting port communicates with another working port of the reversing valve structure. The delay valve structure also includes a delay valve core disposed within the delay channel. When air enters through one working port and does not exit through the other working port, the delay valve core connects the first connecting port to the vent; when air enters through one working port and exits through the other working port, the second connecting port communicates with the vent.

[0015] In some embodiments, both the first and second connecting ports are located on the side of the second mounting plate facing the cylinder. The first mounting plate has a first air passage and a second air passage. One end of the first and second air passages are connected to a working port and another working port, respectively, and the other ends are located on the side of the first mounting plate away from the cylinder, and are connected to the first and second connecting ports, respectively.

[0016] In some embodiments, the vent is located on the side of the second mounting plate.

[0017] In some embodiments, the other end of the exhaust passage is located on the side of a cylinder end plate.

[0018] A hydraulic power unit according to an embodiment of this utility model includes a cylinder, a reversing trigger structure that can send a signal indicating that the cylinder piston has moved to the correct position, and a reversing valve structure that switches the intake and exhaust of the two cylinder chambers of the cylinder according to the signal from the reversing trigger structure. The cylinder has two cylinder end plates, one of which has a piston rod connecting the cylinder piston and the hydraulic cylinder piston. The hydraulic power unit also includes a first mounting plate, which is fitted against the side of the other cylinder end plate opposite to the cylinder. The reversing valve structure is located within the first mounting plate. In this hydraulic power unit, the cylinder and reversing valve structure are integrated, simplifying external connection pipelines and facilitating later maintenance. Attached Figure Description

[0019] 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.

[0020] Figure 1 This is a working principle diagram of a hydraulic station provided in the prior art;

[0021] Figure 2 This is a schematic diagram of the upper part of the hydraulic station in an embodiment of the present utility model;

[0022] Figure 3 This is a schematic diagram of the lower part of the hydraulic station in an embodiment of the present utility model;

[0023] Figure 4 This is a cross-sectional schematic diagram of the first mounting plate in an embodiment of the present utility model;

[0024] Figure 5 This is a cross-sectional schematic diagram of the cylinder body in an embodiment of the present utility model;

[0025] Figure 6 This is another structural schematic diagram of the upper part of the hydraulic station in this embodiment of the present utility model;

[0026] Figure 7 This is another structural schematic diagram of the lower part of the hydraulic station in this embodiment of the present utility model;

[0027] Figure 8 This is a schematic diagram of the baffle in an embodiment of the present utility model;

[0028] Figure 9 This is a cross-sectional schematic diagram of the baffle in an embodiment of the present utility model;

[0029] Figure 10 This is a schematic diagram of the valve block in an embodiment of the present utility model;

[0030] Figure 11 This is a cross-sectional schematic diagram of the valve block in an embodiment of the present utility model. Detailed Implementation

[0031] 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.

[0032] See Figure 2-11 The present invention provides a hydraulic station, including a cylinder 1, a reversing trigger structure that can send a signal that the cylinder piston 102 of the cylinder 1 has moved to the position, a reversing valve structure 4 that switches the intake and exhaust of the two cylinder chambers of the cylinder 1 according to the signal of the reversing trigger structure, and an oil cylinder 5 that is linked to the cylinder 1.

[0033] Cylinder 1 has a cylinder body 101, a cylinder piston 102, a first cylinder end plate 103, and a second cylinder end plate 104. The axis of the cylinder body 101 extends vertically. The cylinder piston 102 is slidably sealed to the inner peripheral wall of the cylinder body 101, separating two cylinder chambers within the cylinder body 101. The first cylinder end plate 103 and the second cylinder end plate 104 respectively close the upper and lower ends of the cylinder body 101. Under the above conditions, when air enters the upper cylinder chamber of the cylinder piston 102, air exits the lower cylinder chamber; when air enters the lower cylinder chamber, air exits the upper cylinder chamber, so that the cylinder piston 102 slides up and down under air pressure.

[0034] There are two reversing trigger structures, namely the first reversing trigger structure 2 and the second reversing trigger structure 3. The first reversing trigger structure 2 and the second reversing trigger structure 3 are respectively set on the first cylinder end plate 103 and the second cylinder end plate 104, so as to obtain whether the cylinder piston 102 has moved up and down into position, and issue the corresponding position signal when the cylinder piston 102 moves up and down into position.

[0035] The reversing valve structure 4 is connected to the first reversing trigger structure 2 and the second reversing trigger structure 3 respectively, so as to switch the cylinder chamber on the upper side of the cylinder piston 102 to intake air and the cylinder chamber on the lower side of the cylinder piston 102 to exhaust air according to the movement signal issued by the first reversing trigger structure 2, and switch the cylinder chamber on the lower side of the cylinder piston 102 to intake air and the cylinder chamber on the upper side of the cylinder piston 102 to exhaust air according to the movement signal issued by the second reversing trigger structure 3.

[0036] The hydraulic station also includes a first mounting plate 6, which is attached to the side of the first cylinder end plate 5 away from the cylinder 1. The first mounting plate 6 is provided with a reversing valve structure 4.

[0037] The first mounting plate 6 has a first mounting hole 601 at each of its four corners. The first mounting hole 601 allows screws to pass through so as to fix the first mounting plate 6 onto the first cylinder end plate 5.

[0038] Under the above conditions, the reversing valve structure 4 includes a reversing channel 401 disposed within the first mounting plate 6. The reversing channel 401 has an air inlet 402, two exhaust ports, and two working ports on its side. The two exhaust ports are a first exhaust port 403 and a second exhaust port 404, and the two working ports are a first working port 405 and a second working port 406. Exhaust mufflers are provided at both the first exhaust port 403 and the second exhaust port 404. Both ends of the reversing channel 401 are sealed, with a control port 407 on one side and a spring 408 inside the other end. The aforementioned end of the reversing channel 401 is sealed by a piston 412 and a piston cap 410 disposed on the side of the piston 412 facing away from the reversing channel 401. The aforementioned other end of the reversing channel 401 is sealed by a spring cap 411. A muffler is provided at the control port 407.

[0039] The reversing valve structure also includes a pneumatically controlled valve core 412 disposed in the reversing channel 401. After the spring 408 compresses the air intake through the control port 407, the air intake port 402 is connected to the second working port 406, and the first exhaust port 403 is connected to the first working port 405. After the spring returns to its original position, the air intake port is connected to the first working port 405, and the second exhaust port 404 is connected to the second working port 406.

[0040] Both working ports of the reversing valve structure 4 are located on the side of the first mounting plate 6 facing the cylinder 1. At this time, a first channel 1031 is provided inside the first cylinder end plate 103, with its two ends respectively located on both sides of the first cylinder end plate 103, and one end of the first channel 1031 communicating with the first working port 405. A second channel 1011 is provided inside the side wall of the cylinder body 101, with its two ends respectively located at both ends of the cylinder body 101, and one end of the second channel 1011 communicating with the other end of the first channel 1031. A third channel 1041 is provided inside the second cylinder end plate 104, with both ends of the third channel 1041 located on the side of the second cylinder end plate 104 facing the cylinder 1, and both ends of the third channel 1041 communicating with the other end of the second channel 1011 and the cylinder cavity below the cylinder piston 102. The first cylinder end plate 103 is provided with a fourth channel 1032. The two ends of the fourth channel 1032 are respectively located on both sides of the first cylinder end plate 103. The two ends of the fourth channel 1032 are respectively connected to the second working port 406 and the cylinder cavity on the upper side of the cylinder piston 102.

[0041] The first mounting plate 6 has an air intake channel 602. One end of the air intake channel 602 is connected to the air intake port 402, and the other end is located on the side of the first mounting plate 6 facing the cylinder 1. The control port 407 is located on the side of the first mounting plate 6 facing the cylinder 1. At this time, the first reversing trigger structure 2 includes a first air control chamber 201, a first air control channel 202, and a second air control channel 203 located in the first cylinder end plate 103. The first air control chamber 201 is connected to the cylinder cavity on the upper side of the cylinder piston 102. One end of the first air control channel 202 and the second air control channel 203 are both connected to the first air control chamber 201, and the other end is located on the side of the first cylinder end plate 103 away from the cylinder 1, and is connected to the other end of the air intake channel 602 and the control port 407, respectively. The first reversing trigger structure 2 also includes a first actuating shaft 204 disposed in the first pneumatic control chamber 201 and extending into the cylinder cavity above the cylinder piston 102. When the first actuating shaft 204 is actuated by the cylinder piston 102, it connects the first pneumatic control channel 202 with the second pneumatic control channel 203. When the cylinder piston 102 is not actuated, it disconnects the connection between the first pneumatic control channel 202 and the second pneumatic control channel 203.

[0042] The second reversing trigger structure 3 includes a second pneumatic control chamber 301, a third pneumatic control channel 302, and an exhaust channel 303 disposed within the second cylinder end plate 104. The second pneumatic control chamber 301 communicates with the cylinder cavity below the cylinder piston 102. One end of the third pneumatic control channel 302 communicates with the second pneumatic control chamber 301, and the other end is disposed on the side of the second cylinder end plate 104 facing the inside of the cylinder 1. One end of the exhaust channel 1043 communicates with the second pneumatic control chamber 301, and the other end is disposed on the side of the second cylinder end plate 104 facing the outside of the cylinder 1. The second reversing trigger structure 3 also includes a second actuating shaft 304 disposed within the second pneumatic control chamber 301 and extending into the cylinder cavity below the cylinder piston 102. When the second actuating shaft 304 is actuated by the cylinder piston 102, it connects the third pneumatic control channel 302 with the exhaust channel 303. When the cylinder piston 102 is not actuated, it disconnects the third pneumatic control channel 302 from the exhaust channel 303. The first cylinder end plate 103 has a fifth channel 1033, one end of which is connected to the second pneumatic control channel 203, and the other end is located on the side of the first cylinder end plate 103 facing the cylinder 1. The side wall of the cylinder body 101 has a sixth channel 1012, with both ends of the sixth channel 1012 located at both ends of the cylinder body 101, and both ends of the sixth channel 1012 connected to the other ends of the third pneumatic control channel 302 and the fifth channel 1033, respectively. The other end of the exhaust channel 303 is located on the side of the second cylinder end plate 104. The side wall of the cylinder body 101 has four fixing channels 1013 through which screws pass to fix the first cylinder end plate 103 and the second cylinder end plate 104 onto the cylinder body 101.

[0043] The hydraulic station also includes a delay valve structure 7. When the first working port 405 is inlet and the second working port 406 is not venting, the delay valve structure 7 connects the first working port 405 to the outside. When the first working port 405 is inlet and the second working port 406 is venting, the delay valve structure 7 connects the second working port 406 to the outside. When the second working port 406 is inlet and the first working port 405 is not venting, the delay valve structure 7 connects the second working port 406 to the outside. When the second working port 406 is inlet and the first working port 405 is venting, the delay valve structure 7 connects the first working port 405 to the outside.

[0044] The hydraulic station also includes a second mounting plate 8, which is fitted to the side of the first cylinder end plate 103 away from the cylinder 1, and the second mounting plate 8 is provided with a delay valve structure 7.

[0045] Under the above conditions, the delay valve structure 7 includes a delay channel 705 disposed in the second mounting plate 8. The delay channel 705 has a vent 706, a first connecting port 707 and a second connecting port 708. The vent 706 is connected to the outside, the first connecting port 707 is connected to the first working port 405, and the second connecting port 708 is connected to the second working port 406. The delay valve structure 7 also includes a delay valve core 701 disposed in the delay channel 705. When the first working port 405 is inlet and the second working port 406 is outlet, the delay valve core 701 connects the first connecting port 707 with the outlet port 706. When the first working port 405 is inlet and the second working port 406 is outlet, the delay valve core 701 connects the second connecting port 708 with the outlet port 706. When the second working port 406 is inlet and the first working port 405 is not outlet, the second connecting port 708 connects with the outlet port 706. When the second working port 406 is inlet and the first working port 405 is outlet, the first connecting port 707 connects with the outlet port 706.

[0046] The delay channel 705 has a vent 706 on its side, and both ends of the delay channel 705 are sealed. A first connecting port 707 and a second connecting port 708 are respectively provided on the side of each end. Both ends of the delay channel 705 are sealed by a delay valve cover 702. A protrusion is provided on the inner peripheral wall of the delay channel 705. An air vent 706 is provided on the protrusion. The first connecting port 707 and the second connecting port 708 are both provided on the outer sides of the protrusion. The delay valve core 701 is provided inside the protrusion and has a gap between it and the protrusion. When air enters through the first connecting port 707, the delay valve core 701 moves towards the second connecting port 708 and then stops moving. When air enters through the second connecting port 708, it moves towards the first connecting port 707 and then stops moving. The delay valve core 701 is provided with a first sealing ring 703 and a second sealing ring 704. When the delay valve core 701 stops moving towards the second connecting port 708, the first sealing ring 703 is provided inside the protrusion and seals the gap between the delay valve core 701 and the protrusion. When the delay valve core 701 stops moving towards the first connecting port 707, the second sealing ring 704 is provided outside the protrusion. When the delay valve core 701 stops moving towards the first connecting port 707, the first sealing ring 703 is provided outside the protrusion.

[0047] The first connecting port 707 and the second connecting port 708 are both located on the side of the second mounting plate 8 facing the cylinder 1. The first mounting plate 6 has a first air passage 603 and a second air passage 604. One end of the first air passage 603 and the second air passage 604 are connected to the first working port 405 and the second working port 406, respectively. The other ends are both located on the side of the first mounting plate 8 away from the cylinder 1 and are connected to the first connecting port 707 and the second connecting port 708, respectively. The vent port 803 is located on the side of the second mounting plate 8.

[0048] In the hydraulic station of this utility model, when compressed air is introduced into the air inlet 402, the pneumatic control valve core 412 is pushed to the piston 409 end by the spring 408. At this time, the second working port 406 is connected to the second exhaust port 404, and the cylinder chamber on the upper side of the cylinder piston 102 exhausts air. The first working port 405 is connected to the air inlet 402, and the cylinder chamber on the lower side of the cylinder piston 102 takes in air, pushing the cylinder piston 102 to move upward. When the cylinder piston 102 pushes the first actuating shaft 204, the air inlet 402 supplies air to the control port 407 through the air inlet channel 602, the first pneumatic control channel 202, the first pneumatic control chamber 201, and the second pneumatic control channel 203. At the same time, it is connected to the third pneumatic control channel 302 through the fifth channel 1033 and the sixth channel 1012. The air intake of the control port 407 pushes the pneumatic control valve core 412 to the limit position at the end of the spring 408 and stops. At this time, the first working port 405 and the second exhaust port 404 are connected. When the exhaust port 403 is connected, the cylinder chamber below the piston 102 exhausts gas. The second working port 406 is connected to the intake port 402, allowing air to enter the cylinder chamber above the piston 102. This pushes the piston 102 downward, and the first actuating shaft 204 returns to its spring position, closing the connection between the first pneumatic control chamber 201 and the second pneumatic control channel 203. The second pneumatic control channel 203, the fifth channel 1033, the sixth channel 1012, and the third pneumatic control channel 302 form a closed cavity to maintain pressure and ensure that the position of the pneumatic control valve core 412 remains unchanged. When the piston 102 moves downward and pushes the second actuating shaft 304, the third pneumatic control channel 302 connects to the exhaust channel 303 through the second pneumatic control chamber 301, opening the closed cavity and venting gas. The pneumatic control valve core 412 moves towards the piston 409 under the push of the spring 408. At this time, the second actuating shaft 304 returns to its spring position.

[0049] When air enters through the first working port 405, the air entering through the first connecting port 707 pushes the delay valve core 701 to the side of the second connecting port 708. The first connecting port 707 is disconnected from the vent port 706. The first working port 405 and the cylinder cavity on the lower side of the cylinder piston 102 are disconnected from the vent port 706. The second connecting port 708 is connected to the vent port 706. The second working port 406 and the cylinder cavity on the upper side of the cylinder piston 102 are connected to the vent port 706, and the cylinder is in the exhaust state. When air enters through the second working port 406, the air entering through the second connecting port 708 pushes the delay valve core 701 to the side of the first connecting port 707. The second connecting port 708 is disconnected from the vent port 706. The second working port 406 and the cylinder cavity on the upper side of the cylinder piston 102 are disconnected from the vent port 706. The first connecting port 707 is connected to the vent port 706. The first working port 405 and the cylinder cavity on the lower side of the cylinder piston 102 are connected to the vent port 706, and the cylinder is in the exhaust state.

[0050] The hydraulic cylinder 5 comprises a cylinder body 501, a cylinder piston 502, a pump head 503, and a piston rod 504. The axis of the cylinder body 501 extends vertically. The cylinder piston 502 is slidably sealed to the inner circumferential wall of the cylinder body 501, creating two cylinder chambers within the cylinder body 501. The pump head 503 seals the lower end of the cylinder body 501. The upper end of the cylinder body 501 is sealed by a second cylinder end plate 104. The piston rod 504 passes through the second cylinder end plate 104 and connects the cylinder piston 502 and the cylinder piston 102. Under these conditions, the cylinder piston 502 slides vertically under the influence of the cylinder piston 102.

[0051] The oil pump head 502 is provided with an oil inlet 505, which connects the oil cylinder cavity below the oil cylinder piston 502 to the outside. An oil inlet check valve 506 is provided at the oil inlet 505.

[0052] Specifically, a first protrusion 5051 is provided on the inner peripheral wall of the oil inlet 505. Under the above conditions, the oil inlet check valve 506 includes a first sealing head 5063, a first spring 5062, and a baffle 5061.

[0053] The first sealing head 5063 is disposed inside the oil inlet 505 and makes sealing contact with the first protrusion 5051. The first sealing head 5063 has a spherical structure. Further, the first protrusion 5051 has an arc surface, which makes sealing contact with the first sealing head 5063.

[0054] A baffle plate 5061 is installed on one end of the oil inlet 505 near the inside of the cylinder body 501, and the baffle plate 5061 is provided with an oil passage hole 5064. There are multiple oil passage holes 5064, with one oil passage hole 5064 located on the center line of the oil inlet 505, and the other oil passage holes 5064 evenly arranged around the one oil passage hole 5064. Furthermore, an oil passage groove 5052 is provided on the inner peripheral wall of the oil inlet 505 near the inside of the cylinder body 501 to ensure the flow rate.

[0055] The first spring 5062 is supported between the first sealing head 5063 and the baffle 5061. Further, the baffle 5061 between one oil passage hole 5064 and the other oil passage holes 5064 supports the first spring 5062. A boss 5065 is provided on the side of the baffle 5061 near the oil pump head 502, and the first spring 5062 is sleeved around the outer periphery of the boss 5065. The boss 5065 is arranged around one oil passage hole 5064.

[0056] Furthermore, an oil suction filter 509 is provided at the end of the oil inlet 505 that is away from the cylinder body 501.

[0057] The second cylinder end plate 104 is provided with an oil outlet 507, which connects the cylinder cavity above the piston 502 to the outside. A steel oil pipe seat is provided at the oil outlet 507 to prevent damage to the connecting threads when the oil pipe is disassembled during use. The lower part of the second cylinder end plate 104 has a mounting surface, which is located on the outer periphery of the cylinder body 501 for easy installation on an oil tank. The end of the oil outlet 507 that communicates with the outside is located above the mounting surface. An oil outlet check valve 508 is provided at the lower end of the piston rod 504. The oil outlet check valve 508 connects the two cylinder cavities when the piston rod 504 moves downwards and disconnects the connection when the piston rod 504 moves upwards.

[0058] Specifically, the lower end of the piston rod 504 is provided with a cavity 5041, and the side wall of the cavity 5041 is provided with a connecting port 5042, which connects the cavity 5041 with the cylinder cavity on the upper side of the cylinder piston 502. Under the above conditions, the oil outlet check valve 508 includes a second sealing head 5083, a second spring 5082, and a valve block 5081.

[0059] The second sealing head 5083 is disposed within the cavity 5041. The second sealing head 5083 has a spherical structure.

[0060] The second spring 5082 is supported between the second sealing head 5083 and the bottom wall of the cavity 5041.

[0061] A valve block 5081 is encapsulated in the open end of a recess 5041. The valve block 5081 has a through hole 5087, which connects the recess 5041 to the cylinder cavity below the piston 502. The outer circumferential surface of the through hole 5087 is in sealing contact with a second sealing head 5083. The outer circumferential surface of the through hole 5087 has an arc surface, which is in sealing contact with the second sealing head 5083. The valve block 5081 has a first mounting section 5088 and a second mounting section 5089 arranged along the centerline of the through hole. The first mounting section 5088 is located inside the recess 5041, and the second mounting section 5089 is located outside the recess 5041. A second protrusion 5084 is provided on the outer circumferential wall of the second mounting section, and the second protrusion 5084 is connected to the outer circumferential surface of the open end. A first sealing ring 5085 is provided on the side of the second protrusion 5084 near the open end, and the first sealing ring 5085 is in sealing contact with the outer circumferential surface of the open end. The second protrusion 5084 is provided with a mounting hole 5086, and a screw is inserted into the mounting hole 5086 so that the second protrusion 5084 is connected to the outer peripheral surface of the opening end by the screw.

[0062] In addition, the piston 502 of the hydraulic cylinder is provided with a through hole, and the piston rod 504 passes through the through hole. At least two second sealing rings 5043 are provided on the outer peripheral wall of the piston rod 504, and each second sealing ring 5043 is arranged along the length direction of the piston rod 504, and each second sealing ring 5043 is in sealing contact with the inner peripheral wall of the through hole.

[0063] In this invention, when the cylinder piston 102 moves upward, the hydraulic cylinder piston 502 also moves upward. The inlet check valve 506 in the oil pump head 503 opens, and hydraulic oil is drawn into the lower cylinder cavity of the piston 502 through the suction filter 509. The outlet check valve 508 in the piston rod 504 closes. When the cylinder piston 102 moves downward, the hydraulic cylinder piston 502 also moves downward. The inlet check valve 506 in the oil pump head 503 closes, and the outlet check valve 508 in the piston rod 504 opens. The hydraulic oil drawn into the lower cylinder cavity of the piston 502 is squeezed out into the upper cylinder cavity of the piston 502. When the cylinder piston 102 moves upward again, the oil inlet check valve 506 in the oil pump head 503 opens, and the cylinder cavity on the lower side of the cylinder piston 502 draws in hydraulic oil through the oil suction filter 509. The oil outlet check valve 508 in the piston rod 504 closes, and the piston rod 504 squeezes out the hydraulic oil in the cylinder cavity on the upper side of the cylinder piston 502. Then, it is connected to the hydraulic accumulator and hydraulic unit through the hydraulic connector.

[0064] 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.

[0065] 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 power unit, comprising a cylinder, a reversing trigger structure capable of issuing a signal indicating that the cylinder piston has moved to the correct position, and a reversing valve structure for switching the intake and exhaust of the two cylinder chambers of the cylinder according to the signal from the reversing trigger structure; the cylinder having two cylinder end plates, one cylinder end plate having a piston rod connecting the cylinder piston and the hydraulic cylinder piston; characterized in that, It also includes a first mounting plate, which is fitted to the side of another cylinder end plate away from the cylinder, and the first mounting plate is provided with the reversing valve structure.

2. The hydraulic station as described in claim 1, characterized in that, Both working ports of the reversing valve structure are located on the side of the first mounting plate facing the cylinder. The other cylinder end plate is provided with a first channel, with its two ends respectively located on both sides of the other cylinder end plate, and one end of the first channel communicating with a working port; the cylinder body of the cylinder is provided with a second channel, with its two ends respectively located on both ends of the cylinder body, and one end of the second channel communicating with the other end of the first channel; the first cylinder end plate is provided with a third channel, with both ends of the third channel located on the side of the first cylinder end plate facing the inside of the cylinder, and both ends of the third channel communicating with the other end of the second channel and the cylinder cavity at the first cylinder end plate; The other cylinder end plate is provided with a fourth channel, the two ends of the fourth channel are respectively located on both sides of the other cylinder end plate, and the two ends of the fourth channel are respectively connected to another working port and the cylinder cavity on the side of the other cylinder end plate.

3. The hydraulic station as described in claim 1, characterized in that, The first mounting plate is provided with an air intake channel. One end of the air intake channel is connected to the air intake port of the reversing valve structure, and the other end is located on the side of the first mounting plate facing the cylinder. The control port of the reversing valve structure is located on the side of the first mounting plate facing the cylinder. A reversing trigger structure includes a first pneumatic control chamber, a first pneumatic control channel, and a second pneumatic control channel disposed within the end plate of the other cylinder. The first pneumatic control chamber is connected to the cylinder cavity at the end plate of the other cylinder. One end of each of the first and second pneumatic control channels is connected to the first pneumatic control chamber, and the other end is disposed on the side of the other cylinder end plate away from the cylinder cavity, and is connected to the other end of the intake channel and the control port, respectively. The reversing trigger structure also includes a first actuating shaft disposed within the first pneumatic control chamber and extending into the cylinder cavity. When the cylinder piston is actuated, the first actuating shaft connects the first pneumatic control channel with the second pneumatic control channel, and disconnects the first pneumatic control channel from the second pneumatic control channel when the cylinder piston is not actuated.

4. The hydraulic station as described in claim 3, characterized in that, Another reversing trigger structure includes a second pneumatic control chamber, a third pneumatic control channel, and an exhaust channel disposed within the cylinder end plate. The second pneumatic control chamber is connected to the cylinder cavity at the cylinder end plate. One end of the third pneumatic control channel is connected to the second pneumatic control chamber, and the other end is disposed on the side of the cylinder end plate facing the inside of the cylinder. One end of the exhaust channel is connected to the second pneumatic control chamber, and the other end is disposed on the side of the cylinder end plate facing the outside of the cylinder. The reversing trigger structure also includes a second actuating shaft disposed within the second pneumatic control chamber and extending into the cylinder cavity. When the cylinder piston is actuated, the second actuating shaft connects the third pneumatic control channel with the exhaust channel, and disconnects the third pneumatic control channel from the exhaust channel when the cylinder piston is not actuated. The other cylinder end plate is provided with a fifth channel, one end of which is connected to the second pneumatic control channel, and the other end is located on the side of the other cylinder end plate facing the cylinder; the side wall of the cylinder body is provided with a sixth channel, the two ends of which are respectively located at the two ends of the cylinder body, and the two ends of the sixth channel are respectively connected to the other end of the third pneumatic control channel and the other end of the fifth channel.

5. The hydraulic station as described in claim 1, characterized in that, The hydraulic station also includes a delay valve structure. When air enters one working port of the directional valve structure and air does not exit through the other working port, the delay valve structure connects the one working port to the outside. When air enters one working port and air exits through the other working port, the other working port connects to the outside.

6. The hydraulic station as described in claim 5, characterized in that, The hydraulic station also includes a second mounting plate, which is fitted onto the side of another cylinder end plate away from the cylinder, and the second mounting plate is provided with the delay valve structure.

7. The hydraulic station as described in claim 6, characterized in that, The delay valve structure includes a delay channel disposed in the second mounting plate. The delay channel has a vent, a first connecting port and a second connecting port. The vent is connected to the outside. The first connecting port is connected to a working port of the reversing valve structure and the second connecting port is connected to another working port of the reversing valve structure. The delay valve structure further includes a delay valve core disposed in the delay channel. When air enters at one working port and air does not exit at the other working port, the delay valve core connects the first connecting port to the venting port. When air enters at one working port and air exits at the other working port, the second connecting port connects to the venting port.

8. The hydraulic station as described in claim 7, characterized in that, Both the first communication port and the second communication port are located on the side of the second mounting plate facing the inside of the cylinder; The first mounting plate is provided with a first air passage and a second air passage. One end of the first air passage and the second air passage are respectively connected to the first working port and the other working port, and the other end is provided on the side of the first mounting plate away from the cylinder, and is respectively connected to the first connecting port and the second connecting port.

9. The hydraulic station as described in claim 7, characterized in that, The vent is located on the side of the second mounting plate.

10. The hydraulic station as described in claim 4, characterized in that, The other end of the air outlet passage is located on the side of the cylinder end plate.

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