CN111810462A - Cylinder hydraulic control system - Google Patents

Abstract

The utility model provides an hydro-cylinder hydraulic control system belongs to hydraulic control technical field. The output pump makes the oil enter the hydraulic oil cylinder and the energy accumulator. When the energy accumulator supplies oil, the oil sequentially passes through the second three-position four-way reversing valve and the first cavity of the conversion oil cylinder, the volume of the first cavity is increased, the volume of the second cavity is increased, the volume of the third cavity is decreased, and the volume of the fourth cavity is decreased. The second chamber sucks oil from the oil tank, and the oil in the third chamber supplies oil to a rod cavity of the hydraulic oil cylinder. When the volume of the first chamber reaches the maximum value, the working position of the second three-position four-way reversing valve is switched, and the processes are carried out reversely. When the energy accumulator enters the conversion oil cylinder, the volume of oil flowing out of the second chamber and the third chamber of the conversion oil cylinder is actually larger than the volume of the oil from the energy accumulator, the energy supply of the hydraulic oil cylinder with large oil volume demand can be realized by the energy accumulator with small volume, and the energy supply cost of the hydraulic oil cylinder with large oil volume demand is reduced.

Description

Cylinder hydraulic control system

technical field

The present disclosure relates to the technical field of hydraulic control, in particular to an oil cylinder hydraulic control system.

Background technique

The hydraulic cylinder is a common hydraulic actuator in the hydraulic system. The expansion and contraction of the piston rod of the hydraulic cylinder can realize different energy supply for many equipment. Hydraulic cylinders are usually supplied with oil through pump sets or accumulators in hydraulic systems, and accumulators are used as backup oil sources to supply oil to hydraulic cylinders when the pump set fails.

In some hydraulic cylinders that have a large demand for oil, the volume of the accumulator that supplies oil to the hydraulic cylinder also needs to be set to a larger size to meet the working requirements of the hydraulic cylinder. However, larger volume accumulators also lead to higher energy supply costs for hydraulic cylinders.

SUMMARY OF THE INVENTION

The embodiments of the present disclosure provide an oil cylinder hydraulic control system, which can reduce the energy supply cost of a hydraulic oil cylinder with a large volume. The technical solution is as follows:

The present disclosure provides an oil cylinder hydraulic control system, the oil cylinder hydraulic control system includes an output pump, an oil tank, a first three-position four-way reversing valve, a hydraulic oil cylinder, an accumulator, a second three-position four-way reversing valve, The conversion oil cylinder, the shuttle valve, the first check valve and the second check valve, the piston rod of the conversion oil cylinder divides the cylinder body of the conversion oil cylinder into a first chamber, a second chamber, a third chamber and The fourth chamber, the first chamber, the second chamber, the third chamber and the fourth chamber are arranged along the length direction of the conversion cylinder, and the first chamber is The volume and the volume of the fourth chamber are smaller than the volume of the second chamber and the volume of the third chamber,

The input end of the output pump is communicated with the oil tank, the output end of the output pump is communicated with the P oil port of the first three-position four-way reversing valve, and the first three-position four-way reversing valve The oil port T is communicated with the oil tank, the oil port A of the first three-position four-way reversing valve is connected with the rodless cavity of the hydraulic cylinder, and the oil port B of the first three-position four-way reversing valve communicated with the rod cavity of the hydraulic cylinder,

The output end of the output pump is communicated with the oil inlet of the accumulator, the oil outlet of the accumulator is communicated with the P oil port of the second three-position four-way reversing valve, the second The T oil port of the three-position four-way reversing valve is communicated with the oil tank, the A oil port of the second three-position four-way reversing valve is communicated with the first chamber, and the second three-position four-way reversing valve is connected to the first chamber. The B oil port of the direction valve is communicated with the fourth chamber, the second chamber and the third chamber are respectively communicated with the two oil inlet ports of the shuttle valve, and the oil outlet port of the shuttle valve is connected to the The rod chambers of the hydraulic cylinder are communicated,

The oil inlet of the first check valve is communicated with the oil tank, the oil outlet of the first check valve is communicated with the second chamber, and the oil inlet of the second check valve is communicated with the oil tank. The oil tank is communicated, and the oil outlet of the second one-way valve is communicated with the third chamber.

Optionally, the oil cylinder hydraulic control system further includes a first hydraulically controlled check valve, and the oil inlet of the first hydraulically controlled check valve is communicated with the A oil port of the second three-position four-way reversing valve. , the oil outlet of the first hydraulic control check valve is communicated with the first chamber.

Optionally, the oil cylinder hydraulic control system further includes a second hydraulically controlled check valve, and the oil inlet of the second hydraulically controlled check valve is communicated with the B oil port of the second three-position four-way reversing valve. , the oil outlet of the second hydraulic control check valve is communicated with the fourth chamber.

Optionally, the oil cylinder hydraulic control system further comprises a first limit switch and a second limit switch, the first limit switch and the second limit switch are respectively arranged at both ends of the conversion oil cylinder, And the detection head of the first limit switch and the detection head of the second limit switch are respectively located in the first chamber and the fourth chamber.

Optionally, the hydraulic control system of the oil cylinder further includes a two-position two-way reversing valve, and the P oil port and the T oil port of the two-position two-way reversing valve are respectively connected with the rodless cavity and the rod of the hydraulic cylinder. cavity communication.

Optionally, the oil cylinder hydraulic control system further includes a third hydraulically controlled check valve, an oil inlet of the third hydraulically controlled check valve is communicated with the oil tank, and an outlet of the third hydraulically controlled check valve is connected to the oil tank. The oil port is communicated with the rodless cavity of the hydraulic oil cylinder, and the control oil port of the third hydraulic control check valve is communicated with the P oil port of the two-position two-way reversing valve.

Optionally, the oil cylinder hydraulic control system further includes a two-position three-way reversing valve, and the P oil port of the two-position three-way reversing valve is communicated with the B oil port of the first three-position four-way reversing valve. , the oil port A of the two-position three-way reversing valve is communicated with the rod cavity of the hydraulic cylinder, and the oil port T of the two-position three-way reversing valve is communicated with the oil tank.

Optionally, the oil cylinder hydraulic control system further includes a third limit switch and a fourth limit switch, and the detection head of the third limit switch and the detection head of the fourth limit switch are located in the hydraulic The rod cavity of the oil cylinder and the rodless cavity of the hydraulic oil cylinder.

Optionally, the oil cylinder hydraulic control system further includes a pressure reducing valve, the oil inlet of the pressure reducing valve is communicated with the A oil port of the first three-position four-way reversing valve, and the outlet of the pressure reducing valve is connected to the oil port A of the first three-position four-way reversing valve. The oil port is communicated with the rodless cavity of the hydraulic cylinder, and the control oil port of the pressure reducing valve is communicated with the oil outlet of the pressure reducing valve.

Optionally, the oil cylinder hydraulic control system further includes a third one-way valve, the oil inlet of the third one-way valve is communicated with the oil port A of the first three-position four-way reversing valve, the third one-way valve is The oil outlet of the three-way valve is communicated with the rodless cavity of the hydraulic cylinder.

The beneficial effects brought by the technical solutions provided by the embodiments of the present disclosure include:

After the output pump draws oil from the oil tank, the oil enters the rodless cavity or rod cavity of the hydraulic cylinder through the first three-position four-way reversing valve in working state to push the piston rod of the hydraulic cylinder to extend or retract. The stable operation of the hydraulic cylinder can be realized. The output end of the output pump is also communicated with the oil inlet of the accumulator. When the output pump supplies oil to the hydraulic cylinder, it can supplement the oil of the accumulator at the same time. The oil outlet of the accumulator is connected to the P oil port of the second three-position four-way reversing valve, the T oil port of the second three-position four-way reversing valve is connected to the oil tank, and the second three-position four-way reversing valve The oil port A is connected to the first chamber, the oil port B of the second three-position four-way reversing valve is connected to the fourth chamber, and the second chamber and the third chamber are respectively connected to the two oil inlets of the shuttle valve. The oil outlet of the shuttle valve is communicated with the rod chamber of the hydraulic cylinder, the oil inlet of the first check valve is communicated with the oil tank, the oil outlet of the first check valve is communicated with the second chamber, and the oil outlet of the second check valve is communicated with the second chamber. The oil inlet is communicated with the oil tank, and the oil outlet of the second check valve is communicated with the third chamber. When the accumulator replaces the output pump to supply oil to the hydraulic cylinder, assuming that the PA oil circuit of the second three-position four-way reversing valve is connected, the oil flows out from the accumulator, and passes through the second three-position four-way changeover in turn. To the PA oil circuit of the valve, the first chamber of the switching cylinder, the piston rod of the switching cylinder moves, the volume of the first chamber of the switching cylinder becomes larger, the volume of the second chamber becomes larger, the volume of the third chamber becomes smaller, and the volume of the first chamber of the switching cylinder becomes larger. The volume of the four chambers becomes smaller, so the second chamber will absorb oil from the tank through the first one-way valve, and the oil in the third chamber will flow into the hydraulic cylinder through the shuttle valve to supply the rod cavity of the hydraulic cylinder. Oil, the oil in the fourth chamber flows from the PB oil circuit of the second three-position four-way reversing valve to the oil tank under pressure. When the volume of the first chamber reaches the maximum value, switch the working position of the second three-position four-way reversing valve to make the PB oil passage of the second three-position four-way reversing valve conduct, and the above process is reversed until the fourth When the volume of the chamber reaches the maximum value, oil is supplied to the rod chamber of the hydraulic cylinder in sequence. Since the volumes of the first chamber and the fourth chamber in the conversion cylinder are both smaller than those of the second and third chambers, when the volume of the oil entering the first and fourth chambers from the accumulator is constant, the second and fourth chambers of the conversion cylinder will have a certain volume. The volume of oil flowing out of the three-chamber is actually larger than the volume of oil from the accumulator. The accumulator with a smaller volume can be used to supply energy to a hydraulic cylinder that requires a larger volume of oil, reducing the need for oil volume. The energy supply cost of hydraulic cylinders with large demand.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present disclosure more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative work,

1 is a schematic structural diagram of a conversion oil cylinder provided by an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of an oil cylinder hydraulic control system provided by an embodiment of the present disclosure.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present disclosure clearer, the embodiments of the present disclosure will be further described in detail below with reference to the accompanying drawings.

For ease of understanding, the structure of the hydraulic cylinder is described here. FIG. 1 is a schematic structural diagram of a conversion cylinder 1 provided by an embodiment of the present disclosure. Referring to FIG. 1 , the conversion cylinder 1 at least includes a cylinder block 101 and a length along the cylinder block 101 . The direction of the piston rod 102 is slidably arranged.

The cylinder block 101 includes a first cylinder section 1011 , a second cylinder section 1012 , a third cylinder section 1013 that are coaxially fixed and sealed in sequence, and two oil cylinders that are hermetically connected to the openings of the first cylinder section 1011 and the third cylinder section 1013 . Cover 1014. The first barrel section 1011 and the third barrel section 1013 have the same structure. The piston rod 102 includes a rod-shaped body 1021 and a first piston 1022 , a second piston 1023 and a third piston 1024 fixed in sequence along the axial direction of the rod-shaped body 1021 , and the first piston 1022 , the second piston 1023 and the third piston 1024 are respectively matched with the inner wall shapes of the first barrel section 1011 , the second barrel section 1012 and the third barrel section 1013 , and are respectively located in the first barrel section 1011 , the second barrel section 1012 and the third barrel section 1013 . The difference between the total length of the cylinder block 101 and the maximum distance between the first piston 1022 and the third piston 1024 is equal to the total length of the first cylinder section 1011 .

1, the first piston 1022, the second piston 1023 and the third piston 1024 divide the interior of the cylinder 101 into a first chamber S1, a second chamber S2, a third chamber S3 and a fourth chamber S4. The first chamber S1 and the fourth chamber S4 are respectively located in the first cylinder section 1011 and the third cylinder section 1013 , and the second chamber S2 and the third chamber S3 are both located in the second cylinder section 1012 .

It should be noted that, the first barrel section 1011, the second barrel section 1012 and the third barrel section 1013 can all be cylindrical structures. It is convenient to realize the normal oil supply and energy supply of the conversion oil cylinder 1 . In other implementations provided by the present disclosure, the first barrel section 1011 , the second barrel section 1012 , and the third barrel section 1013 may also be configured as rectangular barrel-shaped or polygonal barrel-shaped structures, which are not limited in the present disclosure.

The operation principle of the conversion cylinder 1 is described here. When the oil pushes the rod-shaped body 1021, and the rod-shaped body 1021 drives the first piston 1022, the second piston 1023 and the third piston 1024 to move, the first chamber S1, The volumes of the second chamber S2, the third chamber S3 and the fourth chamber S4 all change. The axial movement distance of the first piston 1022, the second piston 1023 and the third piston 1024 is constant, and the change in the volume of the first chamber S1 is the distance between the axial movement of the first piston 1022 and the inner wall of the first cylinder section 1011. The product of the cross-sectional area, the volume change of the second chamber S2 is the product of the distance the second piston 1023 moves in the axial direction and the cross-sectional area of the inner wall of the second cylinder segment 1012 (same as the third chamber S3). The area of the cross section of the inner wall of the first cylinder section 1011 is smaller than the area of the cross section of the inner wall of the second cylinder section 1012, so the change in the volume of the second chamber S2 and the change in the volume of the third chamber S3 are both larger than those of the first cylinder section 1012. The amount of change in the volume of chamber S1. For example, when the first chamber S1 enters the oil, the second chamber S2 needs to receive oil from the outside to ensure that the second chamber S2 is filled with oil, while the third chamber S3 needs to discharge the excess oil.

FIG. 2 is a schematic diagram of an oil cylinder hydraulic control system provided by an embodiment of the present disclosure. As shown in FIG. 2 , the present disclosure provides an oil cylinder hydraulic control system. The oil cylinder hydraulic control system includes an output pump 2 , an oil tank 3 , a first three Position four-way reversing valve 4, hydraulic cylinder 5, accumulator 6, second three-position four-way reversing valve 7, switching cylinder 1, shuttle valve 8, first check valve 9 and second check valve 10, The piston rod 102 of the conversion oil cylinder 1 divides the cylinder block 101 of the conversion oil cylinder 1 into a first chamber S1, a second chamber S2, a third chamber S3 and a fourth chamber S4, a first chamber S1, a second chamber The chamber S2, the third chamber S3 and the fourth chamber S4 are arranged along the length direction of the conversion cylinder 1, and the volume of the first chamber S1 and the volume of the fourth chamber S4 are smaller than the volume of the second chamber S2 and the third chamber. The volume of the three-chamber S3. The input end of the output pump 2 is communicated with the oil tank 3, the output end of the output pump 2 is communicated with the P oil port of the first three-position four-way reversing valve 4, and the T oil port of the first three-position four-way reversing valve 4 is connected with the oil tank. 3 is connected, the oil port A of the first three-position four-way reversing valve 4 is connected with the rodless cavity of the hydraulic cylinder 5, and the B oil port of the first three-position four-way reversing valve 4 is connected with the rod cavity of the hydraulic cylinder 5. .

The output end of the output pump 2 is communicated with the oil inlet of the accumulator 6, and the oil outlet of the accumulator 6 is communicated with the P oil port of the second three-position four-way reversing valve 7, and the second three-position four-way reversing The oil port T of the valve 7 is connected to the oil tank 3, the oil port A of the second three-position four-way reversing valve 7 is connected to the first chamber S1, and the oil port B of the second three-position four-way reversing valve 7 is connected to the fourth chamber S1. The chamber S4 is connected, the second chamber S2 and the third chamber S3 are respectively connected to the two oil inlets of the shuttle valve 8 , and the oil outlet of the shuttle valve 8 is connected to the rod chamber of the hydraulic cylinder 5 . The oil inlet of the first check valve 9 is communicated with the oil tank 3, the oil outlet of the first check valve 9 is communicated with the second chamber S2, the oil inlet of the second check valve 10 is communicated with the oil tank 3, and the second The oil outlet of the check valve 10 communicates with the third chamber S3.

After the output pump 2 draws the oil from the oil tank 3, the oil enters the rodless cavity or the rod cavity of the hydraulic cylinder 5 through the first three-position four-way reversing valve 4 in the working state to push the piston rod 102 of the hydraulic cylinder 5. Extending or retracting can realize the stable operation of the hydraulic cylinder 5 . The output end of the output pump 2 is also communicated with the oil inlet of the accumulator 6 . When the output pump 2 supplies oil to the hydraulic cylinder 5 , the accumulator 6 can be supplemented with oil at the same time.

The oil outlet of the accumulator 6 is connected with the P oil port of the second three-position four-way reversing valve 7, the T oil port of the second three-position four-way reversing valve 7 is connected with the oil tank 3, and the second three-position four-way The oil port A of the reversing valve 7 communicates with the first chamber S1, the oil port B of the second three-position four-way reversing valve 7 communicates with the fourth chamber S4, and the second chamber S2 and the third chamber S3 are respectively The two oil inlets of the shuttle valve 8 are connected, the oil outlet of the shuttle valve 8 is communicated with the rod cavity of the hydraulic cylinder 5, the oil inlet of the first check valve 9 is communicated with the oil tank 3, and the oil outlet of the first check valve 9 is communicated with the oil tank 3. The oil outlet is communicated with the second chamber S2, the oil inlet of the second check valve 10 is communicated with the oil tank 3, and the oil outlet of the second check valve 10 is communicated with the third chamber S3. When the accumulator 6 supplies oil to the hydraulic cylinder 5 instead of the output pump 2, assuming that the PA oil circuit of the second three-position four-way reversing valve 7 is turned on, the oil flows out from the accumulator 6 and passes through the second The PA oil circuit of the three-position four-way reversing valve 7, the first chamber S1 of the switching cylinder 1, the piston rod 102 of the switching cylinder 1 moves, the volume of the first chamber S1 of the switching cylinder 1 increases, and the second chamber S2 The volume becomes larger, the volume of the third chamber S3 becomes smaller, and the volume of the fourth chamber S4 becomes smaller, so the second chamber S2 will absorb oil from the oil tank 3 through the first one-way valve 9, and the third chamber S3 will The oil will flow into the hydraulic cylinder 5 through the shuttle valve 8 to supply oil to the rod cavity of the hydraulic cylinder 5, and the oil in the fourth chamber S4 is under pressure from the PB oil circuit of the second three-position four-way reversing valve 7. Flow to tank 3. When the volume of the first chamber S1 reaches the maximum value, the working position of the second three-position four-way reversing valve 7 is switched, so that the PB oil passage of the second three-position four-way reversing valve 7 is conducted, and the above process is reversed. Until the volume of the fourth chamber S4 reaches the maximum value, oil is supplied to the rod chamber of the hydraulic cylinder 5 in sequence. Since the volumes of the first chamber S1 and the fourth chamber S4 in the conversion cylinder 1 are both smaller than those of the second and third chambers, when the volume of oil entering the first and fourth chambers from the accumulator 6 is constant, the The volume of oil flowing out of the second and third chambers of 1 will actually be larger than the volume of oil from the accumulator 6, and the accumulator 6 with a smaller volume can be used to realize the hydraulic oil cylinder 5 that requires a large volume of oil. The energy supply reduces the energy supply cost of the hydraulic oil cylinder 5 which has a large demand for oil volume.

Referring to FIG. 2 , the oil cylinder hydraulic control system may further include a first hydraulically controlled check valve 11 , and the oil inlet of the first hydraulically controlled check valve 11 is connected to the A oil port of the second three-position four-way reversing valve 7 , The oil outlet of the first hydraulic control check valve 11 is communicated with the first chamber S1.

The first hydraulic control check valve 11 can ensure that the oil in the accumulator 6 can stably enter the conversion oil cylinder 1 for oil supply, so as to avoid the occurrence of oil when the accumulator 6 supplies oil to the second three-position four-way reversing valve 7 The situation occurs where the fluid flows from the switching cylinder 1 to the accumulator 6 . It is also possible to input oil into the control oil port of the first hydraulically controlled check valve 11 in a relatively emergency situation, so that the first hydraulically controlled check valve 11 can conduct reversely, and the safety is better.

Optionally, the hydraulic control system of the oil cylinder may further include a second hydraulically controlled check valve 12, the oil inlet of the second hydraulically controlled check valve 12 is connected to the B oil port of the second three-position four-way reversing valve 7, and the third The oil outlet of the two hydraulic control check valve 12 is communicated with the fourth chamber S4.

The second hydraulic control one-way valve 12 can ensure that the oil in the accumulator 6 can stably enter the conversion oil cylinder 1 for oil supply, so as to avoid the occurrence of oil when the accumulator 6 supplies oil to the second three-position four-way reversing valve 7 The situation occurs where the fluid flows from the switching cylinder 1 to the accumulator 6 . It is also possible to input oil into the control oil port of the second hydraulically controlled check valve 12 in a relatively emergency situation, so that the second hydraulically controlled check valve 12 can conduct reversely, and the safety is better.

Exemplarily, the oil drain port of the first hydraulically controlled check valve 11 may be communicated with the B oil port of the second three-position four-way reversing valve 7, and the oil drain port of the second hydraulically controlled check valve 12 may be communicated with the second hydraulically controlled check valve 12. The oil port A of the three-position four-way reversing valve 7 is connected to facilitate the release of the oil of the first hydraulic control check valve 11 and the second hydraulic control check valve 12 .

In other implementation manners provided by the present disclosure, the oil drain port of the first hydraulic control check valve 11 and the oil drain port of the second hydraulic control check valve 12 may also be directly connected to the oil tank 3 or other hydraulic components. There is no restriction on the disclosure.

Referring to FIG. 2 , the hydraulic control system of the oil cylinder may further include a first limit switch 13 and a second limit switch 14 . The first limit switch 13 and the second limit switch 14 are respectively disposed at both ends of the conversion oil cylinder 1 , and The detection head of the first limit switch 13 and the detection head of the second limit switch 14 are located in the first chamber S1 and the fourth chamber S4, respectively.

The detection heads are located in the first chamber S1 and the fourth chamber S4, respectively, the first limit switch 13 and the second limit switch 14, which can facilitate the detection and determination of the position of the piston to determine whether it is necessary to change the second three bits The working position of the four-way reversing valve 7 improves the working stability of the switching oil cylinder 1 . For example, when the piston rod 102 reaches one end of the cylinder 101, the first limit switch 13 detects the piston rod 102, and when the volume of the fourth chamber S4 becomes infinitely close to zero, the volume of the first chamber S1 is the largest , the oil enters the first chamber S1, and the working position of the second three-position four-way reversing valve 7 needs to be switched, so that the oil enters the fourth chamber S4, and the first chamber S1 discharges the oil; the piston rod When 102 reaches the other end of the cylinder 101, the second limit switch 14 detects the piston rod 102, and when the volume of the first chamber S1 becomes infinitely close to zero, the volume of the fourth chamber S4 reaches the maximum, and the oil The liquid enters the fourth chamber S4, and the working position of the second three-position four-way reversing valve 7 needs to be switched, so that the oil enters the first chamber S1, and the fourth chamber S4 discharges the oil.

Referring to FIG. 2, it can be seen that the hydraulic control system of the oil cylinder can also include a two-position two-way reversing valve 15. The P oil port and the T oil port of the two-position two-way reversing valve 15 are respectively connected with the rodless cavity and the rod cavity of the hydraulic cylinder 5. Connected.

The P oil port and the T oil port of the two-position two-way reversing valve 15 are respectively communicated with the rodless cavity and the rod cavity of the hydraulic cylinder 5. When the hydraulic cylinder 5 does not need oil supply, the two-position two-way reversing valve 15 The rodless cavity and the rod cavity of the hydraulic cylinder 5 are in a conducting state, and the oil in the rodless cavity and the oil in the rod cavity reach a pressure balance, which can prevent the piston rod 102 of the hydraulic cylinder 5 from being changed by external forces. Ensure the stable operation of the hydraulic cylinder 5. Moreover, the oil in the rodless cavity and the oil in the rod cavity reach a pressure balance, and there is no need to apply pressure to the oil in the hydraulic cylinder 5 to ensure that the position of the piston rod 102 remains unchanged, and the whole is relatively energy-saving.

Optionally, the hydraulic control system of the oil cylinder may further include a third hydraulically controlled check valve 16, the oil inlet of the third hydraulically controlled check valve 16 is communicated with the oil tank 3, and the oil outlet of the third hydraulically controlled check valve 16 is connected to the oil tank 3. The rodless cavity of the hydraulic cylinder 5 is communicated, and the control oil port of the third hydraulic control check valve 16 is communicated with the P oil port of the two-position two-way reversing valve 15 .

The oil inlet of the third hydraulic control check valve 16 is communicated with the oil tank 3, the oil outlet of the third hydraulic control check valve 16 is communicated with the rodless cavity of the hydraulic cylinder 5, and the control oil of the third hydraulic control check valve 16 The port communicates with the P port of the 2/2-way reversing valve 15 . The oil between the hydraulic cylinder 5 and the oil tank 3 can be prevented from moving. When the two-position two-way reversing valve 15 is in the conducting state, the third hydraulic control one-way valve 16 conducts reversely, and the hydraulic cylinder 5 can also absorb oil from the oil tank 3, which is convenient to keep the oil inside the hydraulic cylinder 5 stable. Compared with the rod cavity and the rodless cavity that directly conduct the hydraulic cylinder 5 , the hydraulic cylinder 5 will be less impacted, which ensures the stable use of the hydraulic cylinder 5 .

Exemplarily, the hydraulic control system of the oil cylinder may further include a two-position three-way reversing valve 17, and the P oil port of the two-position three-way reversing valve 17 is communicated with the B oil port of the first three-position four-way reversing valve 4, and the two The A oil port of the three-position three-way reversing valve 17 is communicated with the rod cavity of the hydraulic cylinder 5 , and the T oil port of the two-position three-way reversing valve 17 is communicated with the oil tank 3 .

The P oil port of the two-position three-way reversing valve 17 is connected with the B oil port of the first three-position four-way reversing valve 4 , and the A oil port of the two-position three-way reversing valve 17 is connected with the rod cavity of the hydraulic cylinder 5 . , the T oil port of the two-position three-way reversing valve 17 is communicated with the oil tank 3 . In emergency state, the two-position three-way reversing valve 17 can isolate the circuit between the output pump 2 and the hydraulic cylinder 5, ensuring the stable use of the two-position three-way reversing valve 17, and improving the safety of the hydraulic control system of the cylinder.

Referring to FIG. 2 , the hydraulic control system of the oil cylinder may further include a third limit switch 18 and a fourth limit switch 19 . The detection head of the third limit switch 18 and the detection head of the fourth limit switch 19 are located at the hydraulic cylinder 5 , respectively. The rod cavity and the rodless cavity of the hydraulic cylinder 5.

The detection head of the third limit switch 18 and the detection head of the fourth limit switch 19 are located in the rod cavity of the hydraulic cylinder 5 and the rodless cavity of the hydraulic cylinder 5 respectively. The third limit switch 18 and the fourth limit switch The switch 19 can also detect different working states of the hydraulic cylinder 5 to ensure the stable operation of the hydraulic cylinder 5 .

Referring to FIG. 2 , the hydraulic control system of the oil cylinder may further include a pressure reducing valve 20 , the oil inlet of the pressure reducing valve 20 is connected with the oil port A of the first three-position four-way reversing valve 4 , and the oil outlet of the pressure reducing valve 20 It communicates with the rodless cavity of the hydraulic cylinder 5 , and the control oil port of the pressure reducing valve 20 communicates with the oil outlet of the pressure reducing valve 20 .

The oil inlet of the pressure reducing valve 20 is communicated with the oil port A of the first three-position four-way reversing valve 4, the oil outlet of the pressure reducing valve 20 is communicated with the rodless cavity of the hydraulic cylinder 5, and the control oil of the pressure reducing valve 20 The port is connected with the oil outlet of the pressure reducing valve 20, which can ensure that the oil pressure entering the rodless cavity of the hydraulic cylinder 5 is relatively stable, reduce the impact on the hydraulic cylinder 5, and ensure the stable operation of the hydraulic cylinder 5.

Optionally, the oil cylinder hydraulic control system may further include a third one-way valve 21, the oil inlet of the third one-way valve 21 is communicated with the oil port A of the first three-position four-way reversing valve 4, and the third one-way valve The oil outlet of 21 communicates with the rodless cavity of the hydraulic cylinder 5 .

The third one-way valve 21 can avoid the backflow of oil in the hydraulic cylinder 5 and ensure the stable use of the hydraulic cylinder 5 .

Referring to FIG. 2 , the oil cylinder hydraulic control system may further include a first relief valve 22 , the oil inlet of the first relief valve 22 is connected with the output end of the output pump 2 , and the oil outlet of the first relief valve 22 is connected with the oil tank 3 is connected, and the control oil port of the first relief valve 22 is communicated with the oil inlet port of the first relief valve 22 .

The first relief valve 22 can relieve the pressure of the output pump 2 to prevent the hydraulic cylinder 5 from being impacted by excessive oil pressure output by the output pump 2 , and to ensure the stable use of the hydraulic cylinder 5 .

Optionally, the hydraulic control system of the oil cylinder may further include a second relief valve 23, the oil inlet of the second relief valve 23 is communicated with the output end of the accumulator 6, and the oil outlet of the second relief valve 23 is connected with the oil tank 3 is connected, and the control oil port of the second relief valve 23 is communicated with the oil inlet port of the second relief valve 23 .

The second relief valve 23 can release the pressure of the accumulator 6 to avoid the hydraulic cylinder 5 being impacted by the excessive oil pressure output by the accumulator 6 , and to ensure the stable use of the hydraulic cylinder 5 .

Optionally, a fourth one-way valve 24 may be provided between the output pump 2 and the accumulator 6, the oil inlet of the fourth one-way valve 24 is communicated with the output end of the output pump 2, and the outlet of the fourth one-way valve 24 is connected to the output end of the output pump 2. The oil port communicates with the accumulator 6 .

The fourth one-way valve 24 can prevent the oil of the accumulator 6 from flowing to the output pump 2 or the hydraulic cylinder 5 , so as to ensure the stable use of the accumulator 6 .

The above is not intended to limit the present disclosure in any form. Although the present disclosure has been disclosed as above through the examples, it is not intended to limit the present disclosure. Any person skilled in the art, without departing from the scope of the technical solutions of the present disclosure, can The technical contents disclosed above are used to make some changes or modifications to equivalent embodiments with equivalent changes, but any simple modifications or equivalent changes made to the above embodiments according to the technical essence of the present disclosure without departing from the content of the technical solutions of the present disclosure and modification, all still belong to the scope of the technical solution of the present disclosure.

Claims (10)

1. The oil cylinder hydraulic control system is characterized by comprising an output pump (2), an oil tank (3), a first three-position four-way reversing valve (4), a hydraulic oil cylinder (5), an energy accumulator (6), a second three-position four-way reversing valve (7), a conversion oil cylinder (1), a shuttle valve (8), a first check valve (9) and a second check valve (10), wherein a piston rod of the conversion oil cylinder (1) divides a cylinder body of the conversion oil cylinder (1) into a first chamber (S1), a second chamber (S2), a third chamber (S3) and a fourth chamber (S4), the first chamber (S1), the second chamber (S2), the third chamber (S3) and the fourth chamber (S4) are arranged along the length direction of the conversion oil cylinder (1), and the volumes of the first chamber (S1), the fourth chamber (S4) and the second chamber (S2) are all smaller than that of the second chamber (S2), A volume of the third chamber (S3),

the input end of the output pump (2) is communicated with the oil tank (3), the output end of the output pump (2) is communicated with the P oil port of the first three-position four-way reversing valve (4), the T oil port of the first three-position four-way reversing valve (4) is communicated with the oil tank (3), the A oil port of the first three-position four-way reversing valve (4) is communicated with the rodless cavity of the hydraulic oil cylinder (5), the B oil port of the first three-position four-way reversing valve (4) is communicated with the rod cavity of the hydraulic oil cylinder (5),

the output end of the output pump (2) is communicated with an oil inlet of the energy accumulator (6), an oil outlet of the energy accumulator (6) is communicated with a P oil port of the second three-position four-way reversing valve (7), a T oil port of the second three-position four-way reversing valve (7) is communicated with the oil tank (3), an A oil port of the second three-position four-way reversing valve (7) is communicated with the first chamber (S1), a B oil port of the second three-position four-way reversing valve (7) is communicated with the fourth chamber (S4), the second chamber (S2) and the third chamber (S3) are respectively communicated with two oil inlets of the shuttle valve (8), an oil outlet of the shuttle valve (8) is communicated with a rod cavity of the hydraulic oil cylinder (5),

an oil inlet of the first check valve (9) is communicated with the oil tank (3), an oil outlet of the first check valve (9) is communicated with the second cavity (S2), an oil inlet of the second check valve (10) is communicated with the oil tank (3), and an oil outlet of the second check valve (10) is communicated with the third cavity (S3).

2. The oil cylinder hydraulic control system of claim 1, further comprising a first hydraulic control one-way valve (11), wherein an oil inlet of the first hydraulic control one-way valve (11) is communicated with an oil port A of the second three-position four-way reversing valve (7), and an oil outlet of the first hydraulic control one-way valve (11) is communicated with the first chamber (S1).

3. The oil cylinder hydraulic control system of claim 1, further comprising a second hydraulic check valve (12), wherein an oil inlet of the second hydraulic check valve (12) is communicated with an oil port B of the second three-position four-way reversing valve (7), and an oil outlet of the second hydraulic check valve (12) is communicated with the fourth chamber (S4).

4. The hydraulic cylinder control system according to any one of claims 1 to 3, further comprising a first limit switch (13) and a second limit switch (14), wherein the first limit switch (13) and the second limit switch (14) are respectively disposed at two ends of the conversion cylinder (1), and a detection head of the first limit switch (13) and a detection head of the second limit switch (14) are respectively located in the first chamber (S1) and the fourth chamber (S4).

5. The hydraulic control system of the oil cylinder according to any one of claims 1 to 3, characterized by further comprising a two-position two-way reversing valve (15), wherein a P oil port and a T oil port of the two-position two-way reversing valve (15) are respectively communicated with a rodless cavity and a rod cavity of the hydraulic oil cylinder (5).

6. The hydraulic control system of the oil cylinder according to claim 5, further comprising a third hydraulic control one-way valve (16), wherein an oil inlet of the third hydraulic control one-way valve (16) is communicated with the oil tank (3), an oil outlet of the third hydraulic control one-way valve (16) is communicated with a rodless cavity of the hydraulic oil cylinder (5), and a control oil port of the third hydraulic control one-way valve (16) is communicated with a P oil port of the two-position two-way reversing valve (15).

7. The hydraulic control system of the oil cylinder according to any one of claims 1 to 3, characterized by further comprising a two-position three-way reversing valve (17), wherein a P oil port of the two-position three-way reversing valve (17) is communicated with a B oil port of the first three-position four-way reversing valve (4), an A oil port of the two-position three-way reversing valve (17) is communicated with a rod cavity of the hydraulic oil cylinder (5), and a T oil port of the two-position three-way reversing valve (17) is communicated with the oil tank (3).

8. The hydraulic control system of the oil cylinder according to any one of claims 1 to 3, characterized in that the hydraulic control system of the oil cylinder further comprises a third limit switch (18) and a fourth limit switch (19), and a detection head of the third limit switch (18) and a detection head of the fourth limit switch (19) are respectively located in a rod cavity of the hydraulic oil cylinder (5) and a rodless cavity of the hydraulic oil cylinder (5).

9. The oil cylinder hydraulic control system according to any one of claims 1 to 3, characterized by further comprising a pressure reducing valve (20), wherein an oil inlet of the pressure reducing valve (20) is communicated with an oil port A of the first three-position four-way reversing valve (4), an oil outlet of the pressure reducing valve (20) is communicated with a rodless cavity of the hydraulic oil cylinder (5), and a control oil port of the pressure reducing valve (20) is communicated with an oil outlet of the pressure reducing valve (20).

10. The hydraulic control system of the oil cylinder according to any one of claims 1 to 3, further comprising a third check valve, wherein an oil inlet of the third check valve is communicated with an oil port A of the first three-position four-way reversing valve (4), and an oil outlet of the third check valve is communicated with a rodless cavity of the hydraulic oil cylinder (5).

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