A bypass hydraulic cylinder

Abstract

A bypass hydraulic cylinder includes a cylinder body, a piston, a left piston rod, a right piston rod, a left end cap, a right end cap, and an emergency drive assembly. The right piston rod has a second axial hole communicating with a first axial hole. The diameter of the second axial hole is larger than that of the first axial hole, and the inner wall of the second axial hole has internal threads. The emergency drive assembly includes a first rod and a second rod. The outer wall of the first rod has external threads that mate with the internal threads. One end of the first rod is inserted into the second axial hole and fixedly connected to one end of the second rod. The other end of the second rod is inserted into the first axial hole. The length of the second rod is greater than the maximum axial distance from the inner wall of the second radial hole to the end face of the first rod connected to the second rod. This design allows the second rod to move outward from the first axial hole by manually rotating the first rod until the left and right chambers of the cylinder body are connected, enabling the hydraulic cylinder to continue operating normally even when the hydraulic and electrical control systems fail.

Description

Technical Field

[0001] This invention belongs to the field of hydraulic cylinder technology, specifically relating to a bypass hydraulic cylinder that can still operate normally when the external hydraulic system and electrical control system fail. Background Technology

[0002] Hydraulic cylinders are hydraulic actuators that convert hydraulic energy into mechanical energy, causing a piston rod to perform linear reciprocating motion or oscillating motion. They play a crucial role in the testing processes of large or heavy-duty testing platforms. However, in certain specific operating environments and under severe conditions, hydraulic and electrical control systems often fail. If the hydraulic cylinder malfunctions, the entire mechanism cannot operate. Therefore, there is an urgent need for a hydraulic cylinder that can function in both normal and emergency situations. Summary of the Invention

[0003] The purpose of this invention is to overcome the above-mentioned problems in the prior art and to provide a bypass hydraulic cylinder that can still work normally in the event of failure of the external hydraulic system and the electronic control system.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A bypass hydraulic cylinder includes a cylinder body, a piston, a left piston rod, a right piston rod, a left end cap, and a right end cap. The cylinder body is a hollow structure, with its two ends fixedly connected to the left end cap and the right end cap, respectively. The piston is disposed inside the cylinder body and divides the cylinder body into a left chamber and a right chamber. The left chamber and the right chamber are respectively connected to both ends of an external hydraulic system. One end of the left piston rod is fixedly connected to one end of the piston, and its other end extends from the left end cap to the outside of one end of the cylinder body. One end of the right piston rod is fixedly connected to the other end of the piston, and its other end extends from the right end cap to the outside of the other end of the cylinder body. A first axial hole is formed inside the piston. A first radial hole and a second radial hole are formed inside the left piston rod and the right piston rod, respectively. The two ends of the first radial hole are respectively connected to one end of the first axial hole and the left chamber. The two ends of the second radial hole are respectively connected to the other end of the first axial hole and the right chamber.

[0006] The right piston rod is also provided with a second axial hole. One end of the second axial hole is connected to the other end of the first axial hole. The inner wall of the other end of the second axial hole is provided with an internal thread. The diameter of the second axial hole is larger than the diameter of the first axial hole.

[0007] The bypass hydraulic cylinder also includes an emergency drive assembly, which includes a rotating rod. The rotating rod includes a first rod and a second rod. One end of the first rod is located outside the right piston rod. The other end of the first rod is inserted into the second axial hole and then fixedly connected to one end of the second rod. The outer wall of the first rod is provided with an external thread that mates with the internal thread. The other end of the second rod is inserted into the first axial hole. The length of the second rod is greater than the maximum axial distance from the inner wall of the second radial hole to the end face of the first rod connected to the second rod.

[0008] The length of the second rod is less than the minimum axial distance from the inner wall of the first radial hole to the end face of the first rod that connects to the second rod.

[0009] The emergency drive assembly also includes a rotating handle. A mounting groove is provided on one end face of the first rod located outside the right piston rod. The inner wall of the mounting groove cooperates with the outer wall of one end of the rotating handle.

[0010] The interior of the left chamber is connected to one end of the external hydraulic system through port A, and the interior of the right chamber is connected to the other end of the external hydraulic system through port B.

[0011] The outer wall of the first rod that connects to the second rod is sealed to the inner wall of the second axial hole that communicates with the first axial hole through the first sealing ring;

[0012] The outer wall of the second rod at the end away from the first rod is sealed to the inner wall of the first axial hole by a second sealing ring.

[0013] The circumference of the left end cover is fixedly connected to one end face of the cylinder body, and the circumference of the right end cover is fixedly connected to the other end face of the cylinder body by bolts.

[0014] The left and right end caps are respectively provided with a first through hole and a second through hole in the middle part. The inner wall of the first through hole is sealed to the outer wall of the left piston rod by two third sealing rings, and the inner wall of the second through hole is sealed to the outer wall of the right piston rod by two fourth sealing rings.

[0015] The outer wall of the piston is sealed to the inner wall of the cylinder between the A port and the B port by two fifth sealing rings.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. In a bypass hydraulic cylinder of the present invention, a second axial hole is further provided inside the right piston rod. One end of the second axial hole is connected to the other end of the first axial hole. The inner wall of the other end of the second axial hole is provided with an internal thread. The diameter of the second axial hole is larger than the diameter of the first axial hole. The bypass hydraulic cylinder also includes an emergency drive assembly, which includes a rotating rod. The rotating rod includes a first rod and a second rod. One end of the first rod is located outside the right piston rod. The other end of the first rod is inserted into the second axial hole and fixedly connected to one end of the second rod. The outer wall of the first rod is provided with an external thread that mates with the internal thread. The other end of the second rod is inserted into the first axial hole. The length of the second rod is greater than the inner wall of the second radial hole extending to the first rod. The maximum axial distance of the end face connected to the second rod is such that, under normal operating conditions, the portion of the first axial hole that could connect the first radial hole and the second radial hole is blocked by the second rod. The left and right chambers are respectively connected to the two ends of the external hydraulic system. In emergency situations, when both the external hydraulic system and the electronic control system fail, the second rod is moved outward from the first axial hole by manually rotating the first rod until it retracts from the portion of the first axial hole that could connect the first radial hole and the second radial hole. The left chamber then connects to the right chamber sequentially through the first radial hole, the first axial hole, and the second radial hole, thereby driving the piston to work normally. This ensures that the hydraulic cylinder can still function in emergency situations, exhibiting high reliability. Therefore, the hydraulic cylinder of this invention can still work normally even when the hydraulic system and the electronic control system fail, demonstrating high reliability.

[0018] 2. In a bypass hydraulic cylinder of the present invention, the outer wall of the end of the first rod connected to the second rod is sealed to the inner wall of the end of the second axial hole connected to the first axial hole through a first sealing ring. The outer wall of the end of the second rod away from the first rod is sealed to the inner wall of the first axial hole through a second sealing ring. This design ensures that oil leakage does not occur between the left and right chambers under normal operating conditions through the first sealing ring, and that hydraulic oil leakage does not occur between the left and right chambers and the outside of the hydraulic cylinder through the second sealing ring. It has good sealing performance in both emergency and emergency conditions, preventing hydraulic oil leakage. Therefore, the present invention has good sealing performance. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention.

[0020] Figure 2 for Figure 1 Exploded view.

[0021] Figure 3 This is a schematic diagram of the invention under normal operating conditions.

[0022] Figure 4 This is a schematic diagram of the operation of the present invention under emergency conditions.

[0023] In the diagram, cylinder 1, left chamber 11, right chamber 12, oil port A 13, oil port B 14, piston 2, first axial hole 21, fifth sealing ring 22, left piston rod 3, first radial hole 31, right piston rod 4, second radial hole 41, second axial hole 42, internal thread 421, left end cap 5, first through hole 51, third sealing ring 52, right end cap 6, second through hole 61, fourth sealing ring 62, rotating rod 7, first rod 71, external thread 711, mounting groove 712, second rod 72, first sealing ring 73, second sealing ring 74, and rotating handle 8. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0025] See Figures 1 to 4 A bypass hydraulic cylinder includes a cylinder body 1, a piston 2, a left piston rod 3, a right piston rod 4, a left end cap 5, and a right end cap 6. The cylinder body 1 is a hollow structure, with its two ends fixedly connected to the left end cap 5 and the right end cap 6, respectively. The piston 2 is disposed inside the cylinder body 1 and divides the interior of the cylinder body 1 into a left chamber 11 and a right chamber 12. The left chamber 11 and the right chamber 12 are respectively connected to both ends of an external hydraulic system. One end of the left piston rod 3 is fixedly connected to one end of the piston 2, and its other end extends from the left end cap 5 into the cylinder body 1. One end of the right piston rod 4 is fixedly connected to the other end of the piston 2, and the other end of the piston rod 4 extends from the right end cover 6 to the outside of the other end of the cylinder body 1. The piston 2 has a first axial hole 21 inside. The left piston rod 3 and the right piston rod 4 have a first radial hole 31 and a second radial hole 41 inside, respectively. The two ends of the first radial hole 31 are connected to one end of the first axial hole 21 and the left chamber 11, respectively. The two ends of the second radial hole 41 are connected to the other end of the first axial hole 21 and the right chamber 12, respectively.

[0026] The right piston rod 4 is also provided with a second axial hole 42. One end of the second axial hole 42 is connected to the other end of the first axial hole 21. The inner wall of the other end of the second axial hole 42 is provided with an internal thread 421. The diameter of the second axial hole 42 is larger than the diameter of the first axial hole 21.

[0027] The bypass hydraulic cylinder also includes an emergency drive assembly, which includes a rotating rod 7. The rotating rod 7 includes a first rod 71 and a second rod 72. One end of the first rod 71 is located outside the right piston rod 4. The other end of the first rod 71 is inserted into the second axial hole 42 and then fixedly connected to one end of the second rod 72. The outer wall of the first rod 71 is provided with an external thread 711 that mates with the internal thread 421. The other end of the second rod 72 is inserted into the first axial hole 21. The length of the second rod 72 is greater than the maximum axial distance from the inner wall of the second radial hole 41 to the end face of the first rod 71 that is connected to the second rod 72.

[0028] The length of the second rod 72 is less than the minimum axial distance from the inner wall of the first radial hole 31 to the end face of the first rod 71 that is connected to the second rod 72.

[0029] The emergency drive assembly also includes a rotating handle 8. A mounting groove 712 is provided on one end face of the first rod 71 located outside the right piston rod 4. The inner wall of the mounting groove 712 cooperates with the outer wall of one end of the rotating handle 8.

[0030] The interior of the left chamber 11 is connected to one end of the external hydraulic system through an A port 13, and the interior of the right chamber 12 is connected to the other end of the external hydraulic system through a B port 14.

[0031] The outer wall of the first rod 71 connected to the second rod 72 is sealed to the inner wall of the second axial hole 42 connected to the first axial hole 21 by the first sealing ring 73.

[0032] The outer wall of the second rod 72, away from the first rod 71, is sealed to the inner wall of the first axial hole 21 by the second sealing ring 74.

[0033] The circumference of the left end cover 5 is fixedly connected to one end face of the cylinder body 1, and the circumference of the right end cover 6 is fixedly connected to the other end face of the cylinder body 1 by bolts.

[0034] The left end cap 5 and the right end cap 6 are respectively provided with a first through hole 51 and a second through hole 61 in the middle part. The inner wall of the first through hole 51 is sealed to the outer wall of the left piston rod 3 by two third sealing rings 52, and the inner wall of the second through hole 61 is sealed to the outer wall of the right piston rod 4 by two fourth sealing rings 62.

[0035] The outer wall of the piston 2 is sealed to the inner wall of the cylinder 1 between the A port 13 and the B port 14 by two fifth sealing rings 22.

[0036] The principle of this invention is explained as follows:

[0037] The present invention discloses a bypass hydraulic cylinder. The cylinder body 1 is provided with an A port 13 and a B port 14 for connection to an external hydraulic system, which provides hydraulic energy. A mounting base is provided on the side wall of the cylinder body 1. A left end cover 5 and a right end cover 6 are respectively provided at both ends of the cylinder body 1. Both the left end cover 5 and the right end cover 6 are provided with two O-rings to prevent hydraulic oil leakage to the outside. The piston 2 is located inside the cylinder body 1. The outer wall of the piston 2 is sealed to the inner wall of the cylinder body 1 by two fifth sealing rings 22 to ensure that oil does not leak between the left chamber 11 and the right chamber 12 of the cylinder body 1. The piston 2 has a first axial hole 21 and a second axial hole 42 coaxially arranged inside. The outer wall of the first rod 71 of the rotating rod 7 is threaded into the inner wall of the second axial hole 42 and sealed by a first sealing ring 73 to prevent external leakage. One end of the second rod 72 is fixed to one end of the first rod 71. The first rod 71 is connected to the second rod 72, and its other end is inserted into the first axial hole 21. The outer wall of the second rod 72 is sealed to the inner wall of the first axial hole 21 by the second sealing ring 74 to prevent internal leakage in the left chamber 11 and the right chamber 12. The rotating handle 8 is inserted into the mounting groove 712 opened on the other end face of the first rod 71. By driving the rotating handle 8, the rotating rod 7 can be driven to move left and right along the first axial hole 21 and the second axial hole 42. When the second sealing ring 74 on the rotating rod 7 moves to the end face of the second radial hole 41 and the first axial hole 21 near the second radial hole 41, the left chamber 11 and the right chamber 12 are connected. At this time, the piston 2 can be driven to move normally by human force, so that the hydraulic cylinder can still function in the emergency process. Compared with other hydraulic or electric emergency devices, the movement process of this invention is a mechanical movement completely controlled by human force, which has high reliability.

[0038] Example 1:

[0039] See Figures 1 to 4A bypass hydraulic cylinder includes a cylinder body 1, a piston 2, a left piston rod 3, a right piston rod 4, a left end cover 5, a right end cover 6, and an emergency drive assembly. The cylinder body 1 is a hollow structure, with its two ends fixedly connected to the circumference of the left end cover 5 and the right end cover 6 respectively by bolts. The piston 2 is disposed inside the cylinder body 1 and divides the interior of the cylinder body 1 into a left chamber 11 and a right chamber 12. The interior of the left chamber 11 is connected to one end of an external hydraulic system through an A port 13, and the interior of the right chamber 12 is connected to the other end of an external hydraulic system through a B port 14. One end of the left piston rod 3 is fixedly connected to one end of the piston 2, and the other end extends from the middle of the left end cover 5 to the outside of one end of the cylinder 1. One end of the right piston rod 4 is fixedly connected to the other end of the piston 2, and the other end extends from the middle of the right end cover 6 to the outside of the other end of the cylinder 1. A first axial hole 21 is provided inside the piston 2. A first radial hole 31 and a second radial hole 41 are provided inside the left piston rod 3 and the right piston rod 4, respectively. The two ends of the first radial hole 31 are respectively connected to one end of the first axial hole 21 and the left chamber 11. The two ends of the second radial hole 41 are respectively connected to one end of the first axial hole 21 and the left chamber 11. The other end of the piston rod 4 is connected to the right chamber 12. A second axial hole 42 is also provided inside the right piston rod 4. One end of the second axial hole 42 is connected to the other end of the first axial hole 21. An internal thread 421 is provided on the inner wall of the other end of the second axial hole 42. The diameter of the second axial hole 42 is larger than the diameter of the first axial hole 21. The emergency drive assembly includes a rotating rod 7 and a rotating handle 8. The rotating rod 7 includes a first rod 71 and a second rod 72. One end of the first rod 71 is located outside the right piston rod 4, and a mounting groove 712 is provided on its end face. The inner wall of the mounting groove 712 is connected to the rotating handle. One end of the hand 8 is fitted with the outer wall. The other end of the first rod 71 is inserted into the second axial hole 42 and fixedly connected to one end of the second rod 72. The outer wall of the first rod 71 is provided with an external thread 711 that fits with the internal thread 421. The other end of the second rod 72 is inserted into the first axial hole 21. The length of the second rod 72 is greater than the maximum axial distance from the inner wall of the second radial hole 41 to the end face of the first rod 71 connected to the second rod 72. The length of the second rod 72 is less than the minimum axial distance from the inner wall of the first radial hole 31 to the end face of the first rod 71 connected to the second rod 72.

[0040] Example 2:

[0041] The difference from Example 1 is as follows:

[0042] The outer wall of the first rod 71 connected to the second rod 72 is sealed to the inner wall of the second axial hole 42 connected to the first axial hole 21 by the first sealing ring 73. The outer wall of the second rod 72 away from the first rod 71 is sealed to the inner wall of the first axial hole 21 by the second sealing ring 74. The outer wall of the piston 2 is sealed to the part of the inner wall of the cylinder 1 between the A oil port 13 and the B oil port 14 by two fifth sealing rings 22. The middle parts of the left end cover 5 and the right end cover 6 are respectively provided with a first through hole 51 and a second through hole 61. The inner wall of the first through hole 51 is sealed to the outer wall of the left piston rod 3 by two third sealing rings 52. The inner wall of the second through hole 61 is sealed to the outer wall of the right piston rod 4 by two fourth sealing rings 62.

Claims

1. A bypass hydraulic cylinder, comprising a cylinder body (1), a piston (2), a left piston rod (3), a right piston rod (4), a left end cap (5), and a right end cap (6), wherein the cylinder body (1) is a hollow structure, and its two ends are fixedly connected to the left end cap (5) and the right end cap (6) respectively; the piston (2) is disposed inside the cylinder body (1) and divides the inside of the cylinder body (1) into a left chamber (11) and a right chamber (12); the left chamber (11) and the right chamber (12) are respectively connected to the two ends of an external hydraulic system; one end of the left piston rod (3) is fixedly connected to one end of the piston (2), and its other end extends from the left end cap (5) to the cylinder body (6). 1) At one end of the right piston rod (4), one end is fixedly connected to the other end of the piston (2), and the other end extends from the right end cover (6) to the outside of the other end of the cylinder body (1). The piston (2) has a first axial hole (21) inside. The left piston rod (3) and the right piston rod (4) have a first radial hole (31) and a second radial hole (41) inside, respectively. The two ends of the first radial hole (31) are connected to one end of the first axial hole (21) and the left chamber (11), respectively. The two ends of the second radial hole (41) are connected to the other end of the first axial hole (21) and the right chamber (12), respectively. The characteristic is that: The right piston rod (4) is also provided with a second axial hole (42). One end of the second axial hole (42) is connected to the other end of the first axial hole (21). The inner wall of the other end of the second axial hole (42) is provided with an internal thread (421). The diameter of the second axial hole (42) is larger than the diameter of the first axial hole (21). The bypass hydraulic cylinder also includes an emergency drive assembly, which includes a rotating rod (7). The rotating rod (7) includes a first rod (71) and a second rod (72). One end of the first rod (71) is located outside the right piston rod (4), and the other end of the first rod (71) is inserted into the second axial hole (42) and then fixedly connected to one end of the second rod (72). The outer wall of the first rod (71) is provided with an external thread (711) that mates with the internal thread (421). The second rod (72) has an external thread (711) that mates with the internal thread (421). The other end is inserted into the first axial hole (21). The length of the second rod (72) is greater than the minimum axial distance from the inner wall of the second radial hole (41) to the end face of the first rod (71) connected to the second rod (72). In emergency situations, the second rod (72) is driven to move outward from the first axial hole (21) by manually rotating the first rod (71) until the second rod (72) is withdrawn from the part of the first axial hole (21) that connects the first radial hole (31) and the second radial hole (41).

2. A bypass hydraulic cylinder according to claim 1, characterized in that: The length of the second rod (72) is less than the minimum axial distance from the inner wall of the first radial hole (31) to the end face of the first rod (71) that is connected to the second rod (72).

3. A bypass hydraulic cylinder according to claim 1 or 2, characterized in that: The emergency drive assembly also includes a rotating handle (8). A mounting groove (712) is provided on one end face of the first rod (71) located outside the right piston rod (4). The inner wall of the mounting groove (712) cooperates with the outer wall of one end of the rotating handle (8).

4. A bypass hydraulic cylinder according to claim 1 or 2, characterized in that: The interior of the left chamber (11) is connected to one end of the external hydraulic system through an A oil port (13) opened thereon, and the interior of the right chamber (12) is connected to the other end of the external hydraulic system through a B oil port (14) opened thereon.

5. A bypass hydraulic cylinder according to claim 1 or 2, characterized in that: The outer wall of the first rod (71) connected to the second rod (72) is sealed and fitted by the first sealing ring (73) and the inner wall of the second axial hole (42) connected to the first axial hole (21); The outer wall of the second rod (72) away from the first rod (71) is sealed to the inner wall of the first axial hole (21) by the second sealing ring (74).

6. A bypass hydraulic cylinder according to claim 1 or 2, characterized in that: The circumference of the left end cover (5) and one end face of the cylinder body (1), and the circumference of the right end cover (6) and the other end face of the cylinder body (1) are all fixedly connected by bolts.

7. A bypass hydraulic cylinder according to claim 1 or 2, characterized in that: The left end cap (5) and the right end cap (6) are respectively provided with a first through hole (51) and a second through hole (61) in the middle part. The inner wall of the first through hole (51) is sealed with the outer wall of the left piston rod (3) by two third sealing rings (52), and the inner wall of the second through hole (61) is sealed with the outer wall of the right piston rod (4) by two fourth sealing rings (62).

8. A bypass hydraulic cylinder according to claim 4, characterized in that: The outer wall of the piston (2) is sealed to the part on the inner wall of the cylinder (1) between the A oil port (13) and the B oil port (14) by two fifth sealing rings (22).

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