A piston rod inner check valve and a pneumatic hydraulic pump body with the same

Abstract

The utility model discloses a piston rod inner check valve and pneumatic hydraulic pump body who has the piston rod inner check valve, and piston rod is connected with piston head, and the outer sleeve of piston head is equipped with the cylinder, and the inner peripheral wall of piston head and cylinder is slidably sealed and is separated into two cavities in the cylinder. The end of piston rod is equipped with the recessed cavity, and the lateral wall on recessed cavity is equipped with the communicating port, and the communicating port communicates recessed cavity and one cavity. Check valve includes sealing head, spring and valve block, and sealing head sets up in recessed cavity, and spring supports between sealing head and the bottom wall of recessed cavity, and valve block encapsulates the open end of recessed cavity, and the through -hole is equipped on valve block, and the through -hole communicates recessed cavity and another cavity, and the outer peripheral surface of through -hole and sealing head sealed contact. The utility model discloses the piston rod inner check valve has realized that liquid enters from one end of cylinder, and discharges from the other end of cylinder, and has expanded the use range.

Description

Technical Field

[0001] This utility model relates to the field of piston rods, and more particularly to a piston rod internal check valve and a pneumatic hydraulic pump body having the piston rod internal check valve. Background Technology

[0002] In the prior art, after the piston head on the piston rod is fitted into the cylinder, the piston head, under the pushing and pulling of the piston rod, can only allow the liquid to enter and exit from the same end of the cylinder, and cannot achieve entry from one end of the cylinder and exit from the other end, thus affecting its use. Utility Model Content

[0003] This invention provides a one-way valve inside a piston rod, which allows liquid inside the cylinder to enter from one end of the cylinder and exit from the other end of the cylinder.

[0004] This utility model provides a one-way valve inside a piston rod. A piston head is connected to the piston rod, and a cylindrical body is fitted over the piston head. The piston head and the inner circumferential wall of the cylindrical body are slidably sealed, creating two cavities within the cylindrical body. A recessed cavity is provided at the end of the piston rod, and a connecting port is provided on the side wall of the recessed cavity, connecting the recessed cavity to one of the cavities. The one-way valve includes a sealing head, a spring, and a valve block. The sealing head is disposed within the recessed cavity, and the spring is supported between the sealing head and the bottom wall of the recessed cavity. The valve block is encapsulated at the open end of the recessed cavity, and a through hole is provided on the valve block, connecting the recessed cavity to the other cavity. The outer circumferential surface of the through hole is in sealing contact with the sealing head.

[0005] In some embodiments, the valve block has a first mounting section and a second mounting section arranged along the centerline of the through hole. The first mounting section is disposed inside the cavity, and the second mounting section is disposed outside the cavity. The outer peripheral wall of the second mounting section is provided with a protrusion, which is sealed to the outer peripheral surface of the opening end.

[0006] In some embodiments, the protrusion has a mounting hole with a screw inside, and the screw connects the protrusion to the outer peripheral surface of the opening end.

[0007] In some embodiments, the protrusion is provided with an end face sealing ring, which makes sealing contact with the outer peripheral surface of the opening end.

[0008] In some embodiments, the protrusion is provided with an annular groove on the end face for the end face sealing ring to be inserted.

[0009] In some embodiments, the piston head has a perforation through which the end of the piston rod passes. The protrusion fits against the outer peripheral surface of one end of the perforation.

[0010] In some embodiments, the piston rod has a connecting section at its end, the outer diameter of which is smaller than the outer diameter of the piston rod. The connecting section passes through a through hole, and the transition surface between the connecting section and the piston rod is in contact with the outer peripheral surface of the other end of the through hole.

[0011] In some embodiments, at least two circumferential sealing rings are provided on the outer peripheral wall of the connecting section, each circumferential sealing ring is arranged along the center line of the connecting section, and each circumferential sealing ring is in sealing contact with the inner peripheral wall of the perforation.

[0012] In some embodiments, the outer peripheral wall of the connecting section is provided with at least two circumferential annular grooves, each circumferential annular groove being used for embedding a circumferential sealing ring.

[0013] An embodiment of this utility model also provides a pneumatic hydraulic pump body, including a cylinder, a piston head that is slidably sealed to the inner circumferential wall of the hydraulic cylinder and divides the hydraulic cylinder into two chambers, a hydraulic pump head that seals one end of the hydraulic cylinder, a hydraulic end plate that seals the other end of the hydraulic cylinder, and a piston rod that passes through the hydraulic end plate and connects to the hydraulic piston. The hydraulic pump head has an inlet port that connects one chamber to the outside, and an inlet check valve is provided at the inlet port. The hydraulic end plate is located at the upper end of the hydraulic cylinder and has an outlet port that connects the other chamber to the outside. The lower end of the piston rod has the aforementioned piston rod internal check valve, which connects the two chambers when the piston rod moves downward and disconnects the connection when the piston rod moves upward.

[0014] According to an embodiment of this utility model, a piston rod internal one-way valve is provided. A piston head is connected to the piston rod, and a cylindrical body is sleeved on the piston head. The piston head and the inner peripheral wall of the cylindrical body are slidably sealed, and two cavities are separated within the cylindrical body. A recessed cavity is provided at the end of the piston rod, and a connecting port is provided on the side wall of the recessed cavity, connecting the recessed cavity to one of the cavities. The one-way valve includes a sealing head, a spring, and a valve block. The sealing head is disposed within the recessed cavity, the spring is supported between the sealing head and the bottom wall of the recessed cavity, and the valve block is encapsulated at the open end of the recessed cavity. The valve block has a through hole, which connects the recessed cavity to the other cavity, and the outer peripheral surface of the through hole is in sealing contact with the sealing head. The one-way valve inside the piston rod of this invention opens when the piston rod moves toward the rodless chamber, connecting the rodless chamber and the rod chamber. Liquid in the rodless chamber enters the rod chamber. The valve closes when the piston head moves toward the rod chamber, allowing liquid to be drawn into the rodless chamber from one end of the cylinder and discharged from the rod chamber from the other end. This allows liquid to enter from one end of the cylinder and exit from the other end, expanding its application range. Attached Figure Description

[0015] 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.

[0016] Figure 1 This is a schematic diagram of the upper part of the pneumatic hydraulic pump body driven by a cylinder in an embodiment of this utility model;

[0017] Figure 2 This is a schematic diagram of the lower part of the pneumatic hydraulic pump body driven by a cylinder in an embodiment of this utility model;

[0018] Figure 3 This is a schematic diagram of the baffle in an embodiment of the present utility model;

[0019] Figure 4 This is a cross-sectional schematic diagram of the baffle in an embodiment of the present utility model;

[0020] Figure 5 This is a schematic diagram of the valve block in an embodiment of the present utility model;

[0021] Figure 6 This is a cross-sectional schematic diagram of the valve block in an embodiment of the present utility model;

[0022] Figure 7 This is a schematic diagram of the upper part of the hydraulic station in an embodiment of this utility model;

[0023] Figure 8 This is a schematic diagram of the lower part of the hydraulic station in an embodiment of this utility model;

[0024] Figure 9 This is a cross-sectional schematic diagram of the first mounting plate in an embodiment of the present utility model;

[0025] Figure 10 This is a cross-sectional schematic diagram of the cylinder body in an embodiment of the present utility model;

[0026] Figure 11 This is a schematic diagram of the one-way valve inside the piston rod in an embodiment of the present invention. Detailed Implementation

[0027] 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.

[0028] See Figure 11An embodiment of this utility model provides a one-way valve 508 inside a piston rod 504. A piston head 502 is connected to the piston rod 504, and a cylindrical body is fitted over the piston head 502. The piston head 502 is slidably sealed to the inner circumferential wall of the cylindrical body, creating two chambers within the cylindrical body.

[0029] The piston rod 504 has a recess 5041 at its end, and a connecting port 5042 on the side wall of the recess 5041, which connects the recess 5041 to a cavity. Under the above conditions, the one-way valve 508 includes a second sealing head 5083, a second spring 5082, and a valve block 5081.

[0030] The second sealing head 5083 is disposed within the cavity 5041. The second sealing head 5083 has a spherical structure.

[0031] The second spring 5082 is supported between the second sealing head 5083 and the bottom wall of the cavity 5041.

[0032] The valve block 5081 is encapsulated at the open end of the cavity 5041. The valve block 5081 is provided with a through hole 5087, which connects the cavity 5041 to another cavity. The outer peripheral surface of the through hole 5087 is in sealing contact with the second sealing head 5083. The outer peripheral surface of the through hole 5087 has an arc surface, which is in sealing contact with the second sealing head 5083.

[0033] The valve block 5081 has a first mounting section 5088 and a second mounting section 5089 arranged along the center line of the through hole. The first mounting section 5088 is disposed in the cavity 5041, and the second mounting section 5089 is disposed outside the cavity 5041. A second protrusion 5084 is provided on the outer peripheral wall of the second mounting section 5089, and the second protrusion 5084 is sealed to the outer peripheral surface of the opening end.

[0034] The second protrusion 5084 is provided with a mounting hole 5086, and a screw is provided in the mounting hole. The screw connects the second protrusion 5084 to the outer peripheral surface of the opening end.

[0035] The second protrusion 5084 is provided with an end face sealing ring 5085, which is in sealing contact with the outer peripheral surface of the opening end.

[0036] The second protrusion 5084 is provided with an end face annular groove 5090, which is used for the end face sealing ring 5085 to be embedded.

[0037] The piston head 502 has a through hole, through which the end of the piston rod 504 passes. The second protrusion 5084 is in contact with the outer peripheral surface of one end of the through hole.

[0038] The piston rod 504 has a connecting section 5044 at its end. The outer diameter of the connecting section 5044 is smaller than the outer diameter of the piston rod 504. The connecting section 5044 passes through the through hole, and the transition surface between the connecting section 5044 and the piston rod 504 is in contact with the outer peripheral surface of the other end of the through hole.

[0039] At least two circumferential sealing rings 5043 are provided on the outer peripheral wall of the connecting section 5044. Each circumferential sealing ring 5043 is arranged along the center line of the connecting section, and each circumferential sealing ring 5043 is in sealing contact with the inner peripheral wall of the perforation.

[0040] The outer peripheral wall of the connecting section 5044 is provided with at least two circumferential annular grooves 5045, and each circumferential annular groove 5045 is used for embedding of a circumferential sealing ring 5043.

[0041] See Figure 1-6 This utility model provides a pneumatic hydraulic pump body 5. The pneumatic hydraulic pump body 5 includes a hydraulic cylinder 501, a hydraulic piston head 502, a hydraulic pump head 503, a hydraulic end plate 104, and a piston rod 504. The axis of the hydraulic cylinder 501 extends vertically. The hydraulic piston head 502 is slidably sealed to the inner peripheral wall of the hydraulic cylinder 501, creating two hydraulic chambers within the hydraulic cylinder 501. The hydraulic pump head 503 closes the lower end of the hydraulic cylinder 501. The hydraulic end plate 104 closes the upper end of the hydraulic cylinder 501. The piston rod 504 passes through the hydraulic end plate 104 and connects to the hydraulic piston head 502.

[0042] The hydraulic pump head 502 is provided with an inlet 505, which connects the hydraulic cavity on the lower side of the hydraulic piston head 502 to the outside. An inlet check valve 506 is provided at the inlet 505.

[0043] Specifically, a first protrusion 5051 is provided on the inner peripheral wall of the liquid inlet 505. Under the above conditions, the liquid inlet check valve 506 includes a first sealing head 5063, a first spring 5062, and a baffle 5061.

[0044] The first sealing head 5063 is disposed inside the liquid 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.

[0045] A baffle 5061 is installed on one end of the inlet 505 near the inside of the hydraulic cylinder 501, and the baffle 5061 is provided with a fluid passage hole 5064. There are multiple fluid passage holes 5064, with one hole 5064 located on the center line of the inlet 505, and the remaining holes 5064 evenly arranged around it. Furthermore, a fluid passage groove 5052 is provided on the inner peripheral wall of the inlet 505 near the inside of the hydraulic cylinder 501 to ensure flow rate.

[0046] The first spring 5062 is supported between the first sealing head 5063 and the baffle 5061. Further, the baffle 5061 between one fluid passage 5064 and the other fluid passages 5064 supports the first spring 5062. A boss 5065 is provided on the side of the baffle 5061 near the hydraulic pump head 502, and the first spring 5062 is sleeved around the outer periphery of the boss 5065. The boss 5065 surrounds one fluid passage 5064.

[0047] Furthermore, a suction filter 509 is provided at the end of the inlet 505 that is away from the hydraulic cylinder 501.

[0048] The hydraulic end plate 104 is provided with an outlet 507, which connects the hydraulic cavity on the upper side of the hydraulic piston head 502 to the outside. A steel outlet pipe seat is provided at the outlet 507 to prevent damage to the connecting threads when disassembling the outlet pipe during use. The lower part of the hydraulic end plate 104 has a mounting surface, which is located on the outer periphery of the hydraulic cylinder 501 for easy installation, such as mounting on an oil tank. The end of the outlet 507 that communicates with the outside is located above the mounting surface. The lower end of the piston rod 504 is provided with a piston rod internal check valve 508. The piston rod internal check valve 508 connects the two hydraulic cavities when the piston rod 504 moves downward and disconnects the connection when the piston rod 504 moves upward. Specifically, the connecting port 5042 connects the recess 5041 to the hydraulic cavity on the upper side of the hydraulic piston head 502. The through hole 5087 connects the recess 5041 to the hydraulic cavity on the lower side of the hydraulic piston head 502.

[0049] In this invention, when the hydraulic piston head 502 moves upward, the inlet check valve 506 in the hydraulic pump head 503 opens, and hydraulic oil is drawn into the hydraulic cavity below the hydraulic piston head 502 through the suction filter 509. The piston rod check valve 508 in the piston rod 504 closes. When the hydraulic piston head 502 moves downward, the inlet check valve 506 in the hydraulic pump head 503 closes, and the piston rod check valve 508 in the piston rod 504 opens. The hydraulic oil drawn into the hydraulic cavity below the hydraulic piston head 502 is squeezed out into the hydraulic cavity above the hydraulic piston head 502. When the hydraulic piston head 502 moves upward again, the inlet check valve 506 in the hydraulic pump head 503 opens, and the hydraulic chamber on the lower side of the hydraulic piston head 502 draws in hydraulic oil through the suction filter 509. The piston rod check valve 508 in the piston rod 504 closes, and the piston rod 504 squeezes out the hydraulic oil in the hydraulic chamber on the upper side of the hydraulic piston head 502. Then, it is connected to the hydraulic accumulator and hydraulic unit through the hydraulic connector.

[0050] See Figure 7-10The present invention provides a hydraulic power station. It includes the pneumatic hydraulic pump body 5, a cylinder 1 linked to the pneumatic hydraulic pump body 5, a reversing trigger structure that can send a signal that the cylinder piston 102 of the cylinder 1 has moved to the position, and 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.

[0051] Cylinder 1 has a cylinder body 101, a cylinder piston 102, and a cylinder end plate 103. The axis of the cylinder body 101 extends vertically. The cylinder piston 102 is slidably sealed to the inner circumferential wall of the cylinder body 101, separating two cylinder chambers within the cylinder body 101. The cylinder end plate 103 closes the upper end of the cylinder body 101. The lower end of the cylinder body 101 is closed by a hydraulic end plate 104. The cylinder piston 102 is connected to a piston rod 504. Under the above conditions, when air enters the upper cylinder chamber of the cylinder piston 102, air exits the lower cylinder chamber, and vice versa, so that the cylinder piston 102 slides up and down under air pressure, and the piston head 502 slides up and down under the action of the cylinder piston 102.

[0052] 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 installed on the cylinder end plate 103 and the hydraulic end plate 104, so as to obtain whether the cylinder piston 102 has moved up and down into position, and to issue the corresponding position signal when the cylinder piston 102 moves up and down into position.

[0053] 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.

[0054] The hydraulic station also includes a first mounting plate 6, which is fitted to the side of the cylinder end plate 5 away from the cylinder 1. The first mounting plate 6 is provided with a reversing valve structure 4.

[0055] 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 to the cylinder end plate 5.

[0056] 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.

[0057] 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.

[0058] 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 cylinder end plate 103, with its two ends respectively located on both sides of the 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 on 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 hydraulic end plate 104, with both ends of the third channel 1041 located on the side of the hydraulic 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 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 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.

[0059] 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 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 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.

[0060] The second reversing trigger structure 3 includes a second pneumatic control chamber 301, a third pneumatic control channel 302, and an air outlet channel 303 disposed within the hydraulic end plate 104. The second pneumatic control chamber 301 is connected to the cylinder cavity below the cylinder piston 102. One end of the third pneumatic control channel 302 is connected to the second pneumatic control chamber 301, and the other end is disposed on the side of the hydraulic end plate 104 facing the inside of the cylinder 1. One end of the air outlet channel 1043 is connected to the second pneumatic control chamber 301, and the other end is disposed on the side of the hydraulic 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 air outlet channel 303. When the cylinder piston 102 is not actuated, it disconnects the third pneumatic control channel 302 from the air outlet channel 303. The 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 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 hydraulic end plate 104. The side wall of the cylinder body 101 has four fixing channels 1013 through which the screw passes, fixing the cylinder end plate 103 and the hydraulic end plate 104 to the cylinder body 101.

[0061] 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.

[0062] The hydraulic station also includes a second mounting plate 8, which is fitted onto the side of the cylinder end plate 103 away from the cylinder 1, and a delay valve structure 7 is provided inside the second mounting plate 8.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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 one-way valve inside a piston rod, wherein a piston head is connected to the piston rod, a cylindrical body is sleeved around the piston head, the piston head is slidably sealed to the inner circumferential wall of the cylindrical body, and two cavities are separated within the cylindrical body; characterized in that, The piston rod has a recessed cavity at its end, and a connecting port is provided on the side wall of the recessed cavity, which connects the recessed cavity to another cavity. The one-way valve includes a sealing head, a spring, and a valve block. The sealing head is disposed in the recessed cavity, and the spring is supported between the sealing head and the bottom wall of the recessed cavity. The valve block is encapsulated at the opening end of the recessed cavity, and a through hole is provided on the valve block, which connects the recessed cavity to another cavity. The outer peripheral surface of the through hole is in sealing contact with the sealing head.

2. The one-way valve inside the piston rod as described in claim 1, characterized in that, The valve block has a first mounting section and a second mounting section arranged along the centerline of the through hole. The first mounting section is disposed inside the cavity, and the second mounting section is disposed outside the cavity. The outer peripheral wall of the second mounting section is provided with a protrusion, and the protrusion is sealed to the outer peripheral surface of the opening end.

3. The one-way valve inside the piston rod as described in claim 2, characterized in that, The protrusion is provided with a mounting hole, and a screw is provided in the mounting hole. The screw connects the protrusion to the outer peripheral surface of the opening end.

4. The one-way valve inside the piston rod as described in claim 2, characterized in that, The protrusion is provided with an end face sealing ring, which is in sealing contact with the outer peripheral surface of the opening end.

5. The one-way valve inside the piston rod as described in claim 4, characterized in that, The protrusion is provided with an annular groove on the end face, which is for the end face sealing ring to be embedded in.

6. The one-way valve inside the piston rod as described in claim 2, characterized in that, The piston head is provided with a through hole, and the end of the piston rod passes through the through hole; The protrusion is fitted to the outer peripheral surface of one end of the perforation.

7. The one-way valve inside the piston rod as described in claim 6, characterized in that, The piston rod has a connecting section at its end. The outer diameter of the connecting section is smaller than the outer diameter of the piston rod. The connecting section passes through the through hole, and the transition surface between the connecting section and the piston rod is in contact with the outer peripheral surface of the other end of the through hole.

8. The one-way valve inside the piston rod as described in claim 7, characterized in that, At least two circumferential sealing rings are provided on the outer peripheral wall of the connecting section. Each circumferential sealing ring is arranged along the center line of the connecting section, and each circumferential sealing ring is in sealing contact with the inner peripheral wall of the perforation.

9. The piston rod internal check valve as described in claim 8, characterized in that, The outer peripheral wall of the connecting section is provided with at least two circumferential annular grooves, each of which is used for embedding of a circumferential sealing ring.

10. A pneumatic hydraulic pump body, comprising a cylinder, a piston head slidably sealed to the inner circumferential wall of the cylinder and dividing the cylinder into two chambers, a hydraulic pump head sealing one end of the cylinder, a hydraulic end plate sealing the other end of the cylinder, and a piston rod passing through the hydraulic end plate and connected to the piston head, wherein the hydraulic pump head is provided with an inlet, the inlet communicating with one chamber to the outside, and an inlet check valve is provided at the inlet; characterized in that, The hydraulic end plate is disposed at the upper end of the cylinder, and the hydraulic end plate is provided with a liquid outlet, which connects another cavity to the outside; the lower end of the piston rod has a piston rod internal check valve as described in any one of claims 1-9, which connects the two cavities when the piston rod moves downward and disconnects the connection when the piston rod moves upward.

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