Automatic adjustment method for a concrete pumping hydraulic system

Abstract

The present application relates to the technical field of concrete pump truck, and particularly discloses an automatic adjusting method of a concrete pumping hydraulic system, which comprises an executing assembly, an oil supply assembly and an adjusting assembly. The reverse synchronous movement of a first hydraulic cylinder and a second hydraulic cylinder in the executing assembly is realized through the oil supply assembly. In this process, if the moving distances of the first piston and the second piston are synchronous, the total oil volume of the first communicating cavity composed of the small cavity of the first hydraulic cylinder and the small cavity of the second hydraulic cylinder is a constant value a. If it is found that the moving distances of the first piston and the second piston are asynchronous, the total oil volume of the first communicating cavity changes to b, then the amount of oil in the small cavity of the first hydraulic cylinder can be increased through the first adjusting assembly, or the amount of oil in the small cavity of the second hydraulic cylinder can be reduced through the second adjusting assembly, so as to make b approach a and the moving distances of the first piston and the second piston tend to be synchronous.

Description

Technical Field

[0001] This invention relates to the field of concrete pump truck technology, and more particularly to an automatic adjustment method for a concrete pumping hydraulic system. Background Technology

[0002] The piston rod of the main pumping cylinder of the concrete pump is connected to the piston of the concrete cylinder. The continuous pumping of concrete is achieved through the reciprocating motion of the two main cylinders. The two main cylinders are connected in series, with identical cylinder diameter, rod diameter, and stroke. Ideally, these two main cylinders should maintain opposite synchronous motion, meaning they have the same speed and travel distance but in opposite directions. This ensures that the piston rod of one cylinder is fully extended while the piston rod of the other cylinder is just retracted.

[0003] In actual operation, due to factors such as load changes, machining accuracy, wear, and internal leakage, the volume of oil in the connecting chamber of the two cylinders may fluctuate. This can cause synchronization errors, where the piston rod of one cylinder extends / retracts to its correct position, while the piston rod of the other cylinder either doesn't extend / retract to its correct position or overextends. Sometimes, synchronization errors can gradually increase over time, eventually potentially causing the concrete pumping equipment to malfunction. "Not extending / retracting to the correct position" results in low stroke utilization; "overextending" can cause cylinder collision.

[0004] Therefore, there is an urgent need for an automatic adjustment method for the hydraulic system of concrete pumping to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide an automatic adjustment method for a concrete pumping hydraulic system, so as to solve the problem in the related art where the two cylinders are out of sync due to the increase or decrease of oil in the connecting chamber of the main cylinder during operation.

[0006] On one hand, the present invention provides a concrete pumping hydraulic system, the concrete pumping hydraulic system comprising:

[0007] The actuation components include a first hydraulic cylinder and a second hydraulic cylinder;

[0008] The oil supply assembly includes an oil tank, a hydraulic pump, and a solenoid valve assembly. The solenoid valve assembly enables selective communication between the small chamber of the first hydraulic cylinder and the small chamber of the second hydraulic cylinder. When the solenoid valve assembly connects the small chambers of the first and second hydraulic cylinders, the solenoid valve assembly supplies oil from the oil tank to the large chamber of the first hydraulic cylinder via the hydraulic pump, and the large chamber of the second hydraulic cylinder is connected to the oil tank. Alternatively, the solenoid valve assembly supplies oil from the oil tank to the large chamber of the second hydraulic cylinder via the hydraulic pump, and the large chamber of the first hydraulic cylinder is connected to the oil tank.

[0009] The adjustment assembly includes a first adjustment group and a second adjustment group. The first adjustment group is capable of connecting or disconnecting the large chamber and the small chamber of the first hydraulic cylinder, and the second adjustment group is capable of connecting or disconnecting the large chamber and the small chamber of the second hydraulic cylinder.

[0010] As a preferred technical solution for a concrete pumping hydraulic system, the peripheral wall of the first cylinder body of the first hydraulic cylinder is provided with A1 connection hole, A2 connection hole, A3 connection hole and A4 connection hole that communicate with the piston chamber of the first cylinder body along the extension end to the closed end of the first cylinder body.

[0011] The first regulating group includes a first solenoid valve and a second solenoid valve. The first solenoid valve is used to control the connection or disconnection of the A1 connection hole and the A2 connection hole, and the second solenoid valve is used to control the connection or disconnection of the A3 connection hole and the A4 connection hole.

[0012] As a preferred technical solution for a concrete pumping hydraulic system, the peripheral wall of the second cylinder body of the second hydraulic cylinder is provided with B1 connecting hole, B2 connecting hole, B3 connecting hole and B4 connecting hole, which are connected to the piston chamber of the second cylinder body, along the extension end to the closed end of the second cylinder body.

[0013] The second regulating group includes a third solenoid valve and a fourth solenoid valve. The third solenoid valve is used to control the connection or disconnection of the B1 connection hole and the B2 connection hole, and the fourth solenoid valve is used to control the connection or disconnection of the B3 connection hole and the B4 connection hole.

[0014] As a preferred technical solution for a concrete pumping hydraulic system, the solenoid valve group includes a gear adjusting valve, which includes a first gear and a second gear. In the first gear, the small chamber of the first hydraulic cylinder and the small chamber of the second hydraulic cylinder are connected. In the second gear, the large chamber of the first hydraulic cylinder and the large chamber of the second hydraulic cylinder are connected.

[0015] In the second gear position, the solenoid valve assembly supplies oil from the oil tank to the small chamber of the first hydraulic cylinder via the hydraulic pump, and the small chamber of the second hydraulic cylinder is connected to the oil tank; or the solenoid valve assembly supplies oil from the oil tank to the small chamber of the second hydraulic cylinder via the hydraulic pump, and the small chamber of the first hydraulic cylinder is connected to the oil tank.

[0016] As a preferred technical solution for the concrete pumping hydraulic system, the solenoid valve group further includes a first reversing regulating valve. The first interface of the first reversing regulating valve is connected to the outlet of the hydraulic pump, the second interface is connected to the oil tank, the third interface is connected to the large cavity of the first hydraulic cylinder, and the fourth interface is connected to the large cavity of the second hydraulic cylinder. The first reversing regulating valve includes a first position, a second position, and a third position. In the first position, the first interface is connected to the fourth interface, and the second interface is connected to the third interface. In the second position, the first interface, the second interface, the third interface, and the fourth interface are disconnected from each other. In the third position, the first interface is connected to the third interface, and the second interface is connected to the fourth interface.

[0017] As a preferred technical solution for the concrete pumping hydraulic system, the solenoid valve group further includes a second reversing regulating valve. The fifth port of the second reversing regulating valve is connected to the outlet of the hydraulic pump, the sixth port is connected to the oil tank, the seventh port is connected to the small cavity of the first hydraulic cylinder, and the eighth port is connected to the small cavity of the second hydraulic cylinder. The second reversing regulating valve includes a fourth position, a fifth position, and a sixth position. In the fourth position, the fifth port is connected to the eighth port, and the sixth port is connected to the seventh port. In the second position, the fifth port, the sixth port, the seventh port, and the eighth port are disconnected from each other. In the sixth position, the fifth port is connected to the seventh port, and the second port is connected to the eighth port.

[0018] As a preferred technical solution for the hydraulic system of concrete pumping, the solenoid valve group also includes an unloading valve, one end of which is connected to the outlet of the hydraulic pump, and the other end of which is connected to the oil tank.

[0019] On the other hand, the present invention provides an automatic adjustment method, implemented through a concrete pumping hydraulic system in any of the above-described schemes. When the small chambers of the first hydraulic cylinder and the second hydraulic cylinder are connected, the concrete pumping hydraulic system is in a high-pressure position, including a high-pressure adjustment method:

[0020] S10: Supply oil to the large chamber of the first hydraulic cylinder;

[0021] S20: The first piston of the first hydraulic cylinder reaches position A2;

[0022] S30: Monitor whether the second piston of the second hydraulic cylinder is located at position B3. If yes, execute S31; otherwise, execute S321.

[0023] S31: After the adjustment component remains inactive for a period of time T1, S40 is executed;

[0024] S321: If it is determined that the second piston has not reached the B3 position, then execute S322; if it is determined that the second piston has exceeded the B3 position, then execute S323.

[0025] S322: The first adjustment group connects the large chamber and the small chamber of the first hydraulic cylinder for a time T1 and then closes them, and executes S40;

[0026] S323: The second adjustment group connects the large chamber and the small chamber of the second hydraulic cylinder for a time of T1 and then closes it, and executes S40;

[0027] S40 includes S403: the first piston reaches the telescopic end of the first cylinder and supplies oil to the large chamber of the second hydraulic cylinder;

[0028] S50: The second piston of the second hydraulic cylinder reaches position B2;

[0029] S60: Monitor whether the first piston of the first hydraulic cylinder is in position A3. If yes, execute S61; otherwise, execute S621.

[0030] S61: After the adjustment component remains inactive for a period of time T1, S70 is executed;

[0031] S621: If it is determined that the first piston has not reached the A3 position, then execute S622; if it is determined that the first piston has exceeded the A3 position, then execute S623.

[0032] S622: The second adjustment group connects the large chamber and the small chamber of the second hydraulic cylinder for a time of T1 and then closes it, and executes S70;

[0033] S623: The first adjustment group connects the large chamber and the small chamber of the first hydraulic cylinder for a time of T1 and then closes them, and executes S70;

[0034] S70 includes S703: the second piston reaches the telescopic end of the second cylinder and returns to S10.

[0035] As a preferred technical solution for the automatic adjustment method, S40 further includes:

[0036] S401: After time T2, determine whether the first piston of the first hydraulic cylinder has exceeded position A1; or whether the second piston of the second hydraulic cylinder has exceeded position B4. If yes, execute S402; otherwise, execute S403.

[0037] S402: If the first piston of the first hydraulic cylinder exceeds the A1 position, the first adjustment group connects the large and small chambers of the first hydraulic cylinder for a duration of T3 and then closes them; the second adjustment group connects the large and small chambers of the second hydraulic cylinder for a duration of T3 and then closes them; if the second piston of the second hydraulic cylinder exceeds the B4 position, the second adjustment group connects the large and small chambers of the second hydraulic cylinder for a duration of T4 and then closes them, and executes S403.

[0038] The S70 also includes:

[0039] S701: After T2 time, determine whether the second piston of the second hydraulic cylinder exceeds position B1, or whether the first piston of the first hydraulic cylinder exceeds position A4. If yes, execute S702; otherwise, execute S703.

[0040] S702: If the second piston of the second hydraulic cylinder exceeds the B1 position, the second adjustment group will connect the large and small chambers of the second hydraulic cylinder for a duration of T3 and then close it. The first adjustment group will connect the large and small chambers of the first hydraulic cylinder for a duration of T3 and then close it. If the first piston of the first hydraulic cylinder exceeds the A4 position, the first adjustment group will connect the large and small chambers of the first hydraulic cylinder for a duration of T4 and then close it, and execute S703.

[0041] As a preferred technical solution of the automatic adjustment method, the large chamber of the first hydraulic cylinder and the large chamber of the second hydraulic cylinder are connected, the solenoid valve group supplies oil from the oil tank to the small chamber of the first hydraulic cylinder through the hydraulic pump, and the small chamber of the second hydraulic cylinder is connected to the oil tank; or the solenoid valve group supplies oil from the oil tank to the small chamber of the second hydraulic cylinder through the hydraulic pump, and the small chamber of the first hydraulic cylinder is connected to the oil tank.

[0042] When the large chambers of the first hydraulic cylinder and the second hydraulic cylinder are connected, the concrete pumping hydraulic system is in a low-pressure position, and the system also includes a low-pressure adjustment method:

[0043] D10: Supply oil to the small chamber of the first hydraulic cylinder;

[0044] D20: The first piston of the first hydraulic cylinder reaches position A3;

[0045] D30: Monitor whether the second piston of the second hydraulic cylinder is located at position B2. If yes, execute D31; otherwise, execute D321.

[0046] D31: After the adjustment component remains inactive for a period of time T1, execute D40;

[0047] D321: If the second piston does not exceed the B2 position, execute S322; if the second piston exceeds the B2 position, execute S323.

[0048] D322: The first regulating group connects the large and small chambers of the first hydraulic cylinder for a time T1 and then closes them, executing D40;

[0049] D323: The second adjustment group connects the large and small chambers of the second hydraulic cylinder for a time of T1 and then closes them, executing D40;

[0050] D40 includes D403: the first piston reaches the closed end of the first cylinder and supplies oil to the small chamber of the second hydraulic cylinder;

[0051] D50: The second piston of the second hydraulic cylinder reaches position B3;

[0052] D60: Monitor whether the first piston of the first hydraulic cylinder is located at position A2. If yes, execute D61; otherwise, execute D621.

[0053] D61: After the adjustment component remains inactive for a period of time T1, execute D70;

[0054] D621: If the first piston does not exceed the A2 position, execute D622; if the first piston exceeds the A2 position, execute D623.

[0055] D622: The second adjustment group connects the large and small chambers of the second hydraulic cylinder for a time T1 and then closes it, executing D70;

[0056] D623: The first adjustment group connects the large and small chambers of the first hydraulic cylinder for a time T1 and then closes them, executing D70;

[0057] D70 includes D703: the second piston reaches the sealed end of the second cylinder and returns to D10.

[0058] As a preferred embodiment of the automatic adjustment method, the D40 further includes:

[0059] D401: After time T2, determine whether the first piston of the first hydraulic cylinder has exceeded position A4, or whether the second piston of the second hydraulic cylinder has exceeded position B1. If yes, execute D402; otherwise, execute D403.

[0060] D402: If the first piston of the first hydraulic cylinder exceeds the A4 position, the first adjustment group will connect the large and small chambers of the first hydraulic cylinder for a duration of T3 and then close it; the second adjustment group will connect the large and small chambers of the second hydraulic cylinder for a duration of T3 and then close it. If the second piston of the second hydraulic cylinder exceeds the B1 position, the second adjustment group will connect the large and small chambers of the second hydraulic cylinder for a duration of T4 and then close it.

[0061] The D70 also includes:

[0062] D701: After T2 time, determine whether the second piston of the second hydraulic cylinder has exceeded the B4 position, or whether the first piston of the first hydraulic cylinder has exceeded the A1 position. If yes, execute D702; otherwise, execute D703.

[0063] D702; If the second piston of the second hydraulic cylinder exceeds the B4 position, the second adjustment group will connect the large and small chambers of the second hydraulic cylinder for a duration of T3 and then close it, and the first adjustment group will connect the large and small chambers of the first hydraulic cylinder for a duration of T3 and then close it; If the first piston of the first hydraulic cylinder exceeds the A1 position, the first adjustment group will connect the large and small chambers of the first hydraulic cylinder for a duration of T4 and then close it.

[0064] The beneficial effects of this invention are as follows:

[0065] This invention provides an automatic adjustment method for a concrete pumping hydraulic system. The concrete pumping hydraulic system includes an execution component, an oil supply component, and an adjustment component. The execution component includes a first hydraulic cylinder and a second hydraulic cylinder. The oil supply component includes an oil tank, a hydraulic pump, and a solenoid valve assembly. The solenoid valve assembly allows selective connection between the small chamber of the first hydraulic cylinder and the small chamber of the second hydraulic cylinder. When the small chambers of the first and second hydraulic cylinders are connected, the solenoid valve assembly supplies oil from the oil tank to the large chamber of the first hydraulic cylinder via the hydraulic pump, and the large chamber of the second hydraulic cylinder is connected to the oil tank. Alternatively, the solenoid valve assembly supplies oil from the oil tank to the large chamber of the second hydraulic cylinder via the hydraulic pump, and the large chamber of the first hydraulic cylinder is connected to the oil tank. The adjustment component includes a first adjustment group and a second adjustment group. The first adjustment group allows connection or disconnection between the large and small chambers of the first hydraulic cylinder, and the second adjustment group allows connection or disconnection between the large and small chambers of the second hydraulic cylinder. When this concrete pumping hydraulic system is working, the small chambers of the first and second hydraulic cylinders are first connected, and the hydraulic pump starts working. The solenoid valve assembly supplies oil from the tank to the large chamber of the first hydraulic cylinder through the hydraulic pump. At this time, the first piston moves towards the extension end of the first cylinder body, thereby reducing the size of the small chamber of the first hydraulic cylinder. Meanwhile, the small chamber of the second hydraulic cylinder increases, and the oil in the large chamber of the second hydraulic cylinder flows back to the tank. This process continues until the first piston moves to the extension end of the first cylinder body. Then, the solenoid valve assembly supplies oil from the tank to the large chamber of the second hydraulic cylinder through the hydraulic pump. At this time, the second piston moves towards the extension end of the second cylinder body, thereby reducing the size of the small chamber of the second hydraulic cylinder. Meanwhile, the small chamber of the first hydraulic cylinder increases, and the oil in the large chamber of the first hydraulic cylinder flows back to the tank. This process continues until the first piston moves to the extension end of the first cylinder body. The above steps are repeated to achieve the pumping of concrete. During this process, if the movement distances of the first piston and the second piston are synchronized, the total oil volume of the first connected cavity formed by the small chambers of the first hydraulic cylinder and the second hydraulic cylinder is a constant value a. If it is found that the movement distances of the first piston and the second piston are not synchronized, and the total oil volume of the first connected cavity formed by the small chambers of the first hydraulic cylinder and the second hydraulic cylinder changes to b, then the amount of oil in the small chamber of the first hydraulic cylinder can be increased by the first adjustment group, or the amount of oil in the small chamber of the second hydraulic cylinder can be decreased by the second adjustment group, so that b approaches a, and the movement distances of the first piston and the second piston tend to be synchronized. Attached Figure Description

[0066] Figure 1 This is a hydraulic circuit diagram of the concrete pumping hydraulic system in an embodiment of the present invention;

[0067] Figure 2 This is a flowchart of the high-voltage gear adjustment method in the automatic adjustment method of this invention.

[0068] Figure 3 This is a flowchart of the low-pressure gear adjustment method in the automatic adjustment method of this invention.

[0069] In the picture:

[0070] 11. First hydraulic cylinder; 111. First cylinder body; 1111. A1 connecting hole; 1112. A2 connecting hole; 1113. A3 connecting hole; 1114. A4 connecting hole; 1115. A1 position; 1116. A2 position; 1117. A3 position; 1118. A4 position; 112. First piston; 12. Second hydraulic cylinder; 121. Second cylinder body; 1211. B1 connecting hole; 1212. B2 connecting hole; 1213. B3 connecting hole; 1214. B4 connecting hole; 1215. B1 position; 1216. B2 position; 1217. B3 position; 1218. B4 position; 122. Second piston;

[0071] 21. Oil tank; 22. Hydraulic pump; 23. Solenoid valve assembly; 231. Gear adjustment valve; 232. First reversing adjustment valve; 233. Second reversing adjustment valve; 234. Unloading valve;

[0072] 31. First regulating group; 311. First solenoid valve; 312. Second solenoid valve; 32. Second regulating group; 321. Third solenoid valve; 322. Fourth solenoid valve;

[0073] 4. Controller. Detailed Implementation

[0074] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0075] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions. Furthermore, "above," "on top of," and "over" the first feature in relation to the second feature includes the first feature directly above and diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature includes the first feature directly below and diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0076] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0077] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0078] like Figure 1 As shown, this embodiment provides a concrete pumping hydraulic system, which includes an actuation component, an oil supply component, and an adjustment component. The actuation component includes a first hydraulic cylinder 11 and a second hydraulic cylinder 12. The oil supply component includes an oil tank 21, a hydraulic pump 22, and a solenoid valve assembly 23. The solenoid valve assembly 23 enables selective communication between the small chamber of the first hydraulic cylinder 11 and the small chamber of the second hydraulic cylinder 12. When the small chambers of the first hydraulic cylinder 11 and the second hydraulic cylinder 12 are connected, the solenoid valve assembly 23 delivers oil through the hydraulic pump 22. The oil in tank 21 is supplied to the large chamber of the first hydraulic cylinder 11, and the large chamber of the second hydraulic cylinder 12 is connected to the oil tank 21. Alternatively, the solenoid valve group 23 supplies the oil in tank 21 to the large chamber of the second hydraulic cylinder 12 through the hydraulic pump 22, and the large chamber of the first hydraulic cylinder 11 is connected to the oil tank 21. The adjustment assembly includes a first adjustment group 31 and a second adjustment group 32. The first adjustment group 31 can connect or disconnect the large chamber and the small chamber of the first hydraulic cylinder 11, and the second adjustment group 32 can connect or disconnect the large chamber and the small chamber of the second hydraulic cylinder 12.

[0079] Optionally, the first hydraulic cylinder 11 includes a first cylinder body 111 and a first piston 112. The first cylinder body 111 is provided with a piston chamber. The first piston 112 is slidably disposed in the piston chamber of the first cylinder body 111, thereby reciprocating between the telescopic end and the closed end of the first cylinder body 111. One end of the first piston 112 is provided with a telescopic rod, which extends out of the first cylinder body 111 from the telescopic end. The first piston 112 divides the piston chamber of the first cylinder body 111 into two cavities with variable volumes, namely a large cavity and a small cavity, and the telescopic rod is located in the small cavity.

[0080] Optionally, the second hydraulic cylinder 12 includes a second cylinder body 121 and a second piston 122. The second cylinder body 121 is provided with a piston chamber. The second piston 122 is slidably disposed in the piston chamber of the second hydraulic cylinder 12, thereby reciprocating between the telescopic end and the closed end of the second cylinder body 121. One end of the second piston 122 is provided with a telescopic rod, which extends out of the telescopic end of the second cylinder body 121. The second piston 122 divides the piston chamber of the second hydraulic cylinder 12 into two cavities with variable volumes, namely a large cavity and a small cavity, and the telescopic rod is located in the small cavity.

[0081] When the concrete pumping hydraulic system is working, the small chambers of the first hydraulic cylinder 11 and the second hydraulic cylinder 12 are first connected. The hydraulic pump 22 starts working, and the solenoid valve group 23 supplies oil from the oil tank 21 to the large chamber of the first hydraulic cylinder 11 through the hydraulic pump 22. At this time, the first piston 112 moves towards the extension end of the first cylinder body 111, thereby reducing the size of the small chamber of the first hydraulic cylinder 11. Meanwhile, the small chamber of the second hydraulic cylinder 12 increases, and the oil in the large chamber of the second hydraulic cylinder 12 flows back into the oil tank 21 until the first piston 112... After moving to the telescopic end of the first cylinder 111, the solenoid valve assembly 23 supplies oil from the oil tank 21 to the large chamber of the second hydraulic cylinder 12 via the hydraulic pump 22. At this time, the second piston 122 moves to the telescopic end of the second cylinder 121, thereby reducing the size of the small chamber of the second hydraulic cylinder 12. Meanwhile, the small chamber of the first hydraulic cylinder 11 increases, and the oil in the large chamber of the first hydraulic cylinder 11 flows back into the oil tank 21. This process continues until the first piston 112 moves to the telescopic end of the first cylinder 111. The above steps are then repeated to achieve the pumping of concrete. During this process, if the moving distances of the first piston 112 and the second piston 122 are synchronized, the total oil volume of the first connected cavity formed by the small cavity of the first hydraulic cylinder 11 and the small cavity of the second hydraulic cylinder 12 is a constant value a. If it is found that the moving distances of the first piston 112 and the second piston 122 are not synchronized, and the real-time total oil volume b of the first connected cavity formed by the small cavity of the first hydraulic cylinder 11 and the small cavity of the second hydraulic cylinder 12 is not equal to a, then the amount of oil in the small cavity of the first hydraulic cylinder 11 can be increased by the first adjustment group 31, or the amount of oil in the small cavity of the second hydraulic cylinder 12 can be decreased by the second adjustment group 32, so that b approaches a, and the moving distances of the first piston 112 and the second piston 122 tend to be synchronized.

[0082] The peripheral wall of the first cylinder 111 is provided with sequentially spaced connecting holes A1 1111, A2 1112, A3 1113, and A4 1114, which communicate with the piston chamber of the first cylinder 111, from the telescopic end to the closed end. The first adjustment group 31 includes a first solenoid valve 311 and a second solenoid valve 312. The first solenoid valve 311 is used to control the connection or disconnection of the A1 connecting hole 1111 and the A2 connecting hole 1112, and the second solenoid valve 312 is used to control the connection or disconnection of the A3 connecting hole 1113 and the A4 connecting hole 1114. In this embodiment, when the first piston 112 moves between the A1 connecting hole 1111 and the A2 connecting hole 1112, the connection or disconnection of the small chamber and the large chamber of the first cylinder 111 can be adjusted by adjusting the first solenoid valve 311. When the first piston 112 moves between the A3 connecting hole 1113 and the A4 connecting hole 1114, the connection and disconnection of the small chamber and the large chamber of the first cylinder 111 can be adjusted by adjusting the second solenoid valve 312.

[0083] Specifically, the A1 connection hole 1111 is close to the telescopic end of the first cylinder 111, and the A4 connection hole 1114 is close to the closed end of the first cylinder 111.

[0084] The peripheral wall of the second cylinder body 121 of the second hydraulic cylinder 12 is provided with sequentially spaced connecting holes B1 1211, B2 1212, B3 1213, and B4 1214, which communicate with the piston chamber of the second cylinder body 121, from the telescopic end to the closed end. The second adjusting group 32 includes a third solenoid valve 321 and a fourth solenoid valve 322. The third solenoid valve 321 is used to control the connection or disconnection of the B1 connecting hole 1211 and the B2 connecting hole 1212, and the fourth solenoid valve 322 is used to control the connection or disconnection of the B3 connecting hole 1213 and the B4 connecting hole 1214. In this embodiment, when the second piston 122 moves between the B1 connecting hole 1211 and the B2 connecting hole 1212, the connection and disconnection of the small chamber and the large chamber of the second cylinder body 121 can be adjusted by adjusting the third solenoid valve 321. When the second piston 122 moves between the B3 connecting hole 1213 and the B4 connecting hole 1214, the connection and disconnection of the small chamber and the large chamber of the second cylinder 121 can be adjusted by adjusting the fourth solenoid valve 322.

[0085] Optionally, the solenoid valve assembly 23 includes a gear adjusting valve 231, which has a first gear and a second gear. In the first gear, the small chamber of the first hydraulic cylinder 11 and the small chamber of the second hydraulic cylinder 12 are connected. In the second gear, the large chamber of the first hydraulic cylinder 11 and the large chamber of the second hydraulic cylinder 12 are connected. In the second gear, the solenoid valve assembly 23 supplies oil from the oil tank 21 to the small chamber of the first hydraulic cylinder 11 via the hydraulic pump 22, and the small chamber of the second hydraulic cylinder 12 is connected to the oil tank 21. Alternatively, the solenoid valve assembly 23 supplies oil from the oil tank 21 to the small chamber of the second hydraulic cylinder 12 via the hydraulic pump 22, and the small chamber of the first hydraulic cylinder 11 is connected to the oil tank 21. In this embodiment, when the concrete pumping hydraulic system is in the first gear, oil enters the large chamber of either the first hydraulic cylinder 11 or the second hydraulic cylinder 12, resulting in a higher concrete output pressure but a smaller unit output. When the concrete pumping hydraulic system is in the second gear, oil enters the small chamber of either the first hydraulic cylinder 11 or the second hydraulic cylinder 12, resulting in a lower concrete output pressure but a larger unit output. Specifically, the gear adjustment valve 231 is a two-position four-way valve.

[0086] Optionally, the solenoid valve assembly 23 further includes a first reversing regulating valve 232. The first interface of the first reversing regulating valve 232 is connected to the outlet of the hydraulic pump 22, the second interface is connected to the oil tank 21, the third interface is connected to the large chamber of the first hydraulic cylinder 11, and the fourth interface is connected to the large chamber of the second hydraulic cylinder 12. The first reversing regulating valve 232 includes a first position, a second position, and a third position. In the first position, the first interface is connected to the fourth interface, and the second interface is connected to the third interface. In the second position, the first interface, the second interface, the third interface, and the fourth interface are disconnected from each other. In the third position, the first interface is connected to the third interface, and the second interface is connected to the fourth interface. In this embodiment, when the gear adjustment valve 231 is in the first gear position, the first reversing adjustment valve 232 operates. When the first reversing adjustment valve 232 is in the first position, oil enters the large chamber of the second hydraulic cylinder 12, and oil returns to the oil tank 21 from the large chamber of the first hydraulic cylinder 11. At this time, the second piston 122 of the second hydraulic cylinder 12 moves towards the extension end of the second cylinder body 121, and the first piston 112 of the first hydraulic cylinder 11 moves towards the closed end of the first cylinder body 111. When the first reversing adjustment valve 232 is in the third position, oil enters the large chamber of the first hydraulic cylinder 11, and oil returns to the oil tank 21 from the large chamber of the second hydraulic cylinder 12. At this time, the first piston 112 of the first hydraulic cylinder 11 moves towards the extension end of the first cylinder body 111, and the second piston 122 of the second hydraulic cylinder 12 moves towards the closed end of the second cylinder body 121.

[0087] Optionally, the solenoid valve assembly 23 further includes a second reversing regulating valve 233. The fifth port of the second reversing regulating valve 233 is connected to the outlet of the hydraulic pump 22, the sixth port is connected to the oil tank 21, the seventh port is connected to the small chamber of the first hydraulic cylinder 11, and the eighth port is connected to the small chamber of the second hydraulic cylinder 12. The second reversing regulating valve 233 includes a fourth position, a fifth position, and a sixth position. In the fourth position, the fifth port is connected to the eighth port, and the sixth port is connected to the seventh port. In the second position, the fifth, sixth, seventh, and eighth ports are disconnected from each other. In the sixth position, the fifth port is connected to the seventh port, and the second port is connected to the eighth port. In this embodiment, when the gear adjustment valve 231 is in the second gear position, the second reversing adjustment valve 233 operates. When the second reversing adjustment valve 233 is in the fourth position, oil enters the small chamber of the second hydraulic cylinder 12 and returns oil to the oil tank 21. At this time, the second piston 122 of the second hydraulic cylinder 12 moves towards the lower end of the second cylinder body 121, and the first piston 112 of the first hydraulic cylinder 11 moves towards the extension end of the first cylinder body 111. When the second reversing adjustment valve 233 is in the sixth position, oil enters the small chamber of the first hydraulic cylinder 11 and returns oil to the oil tank 21. At this time, the first piston 112 of the first hydraulic cylinder 11 moves towards the bottom end of the first cylinder body 111, and the second piston 122 of the second hydraulic cylinder 12 moves towards the extension end of the second cylinder body 121.

[0088] Specifically, when the gear adjustment valve 231 is in the first gear position, the second reversing adjustment valve 233 is in the fifth position, and when the gear adjustment valve 231 is in the second gear position, the first reversing adjustment valve 232 is in the second position.

[0089] Optionally, the solenoid valve assembly 23 further includes an unloading valve 234, one end of which is connected to the outlet of the hydraulic pump 22, and the other end of which is connected to the oil tank 21. In this embodiment, when the first reversing regulating valve 232 is in the second position and the second reversing regulating valve 233 is in the fifth position, the unloading valve 234 connects the oil outlet of the hydraulic pump 22 to the oil tank 21 to achieve unloading.

[0090] Specifically, both the first reversing control valve 232 and the second reversing control valve 233 are three-position four-way valves.

[0091] Optionally, it also includes a controller 4, which controls the hydraulic pump 22, the solenoid valve group 23, the first regulating group 31, and the second regulating group 32.

[0092] This embodiment also provides an automatic adjustment method, implemented through the concrete pumping hydraulic system in the above scheme. The peripheral wall of the first cylinder body 111 of the first hydraulic cylinder 11 is sequentially provided with positions A1 1115, A2 1116, A3 1117, and A4 1118 at intervals from the telescopic end to the closed end of the first cylinder body 111. Positions A1 1115 and A2 1116 are close to the telescopic end of the first cylinder body 111, and positions A3 1117 and A4 1118 are... 118 is close to the closed end of the first cylinder body 111. The peripheral wall of the second cylinder body 121 of the second hydraulic cylinder 12 is provided with B1 position 1215, B2 position 1216, B3 position 1217 and B4 position 1218 at intervals along the telescopic end to the closed end of the second cylinder body 121. B1 position 1215 and B2 position 1216 are close to the telescopic end of the second cylinder body 121, and B3 position 1217 and B4 position 1218 are close to the closed end of the second cylinder body 121.

[0093] Specifically, A1 position 1115 and A2 position 1116 are located between A1 connecting hole 1111 and A2 connecting hole 1112, A3 position 1117 and A4 position 1118 are located between A3 connecting hole 1113 and A4 connecting hole 1114, B1 position 1215 and B2 position 1216 are located between B1 connecting hole 1211 and B2 connecting hole 1212, and B3 position 1217 and B4 position 1218 are located between B3 connecting hole 1213 and B4 connecting hole 1214.

[0094] Preferably, the first hydraulic cylinder 11 and the second hydraulic cylinder 12 are both digital hydraulic cylinders, which can detect the real-time movement position of the first piston 112 and the second piston 122.

[0095] like Figure 2 As shown, when the shift regulating valve is in the first gear, the concrete pump hydraulic system is in the high-pressure gear. The automatic adjustment method includes the high-pressure gear adjustment method:

[0096] S10: Supply oil to the large chamber of the first hydraulic cylinder 11.

[0097] In this step, the shift adjustment valve is adjusted to the first gear, the first reversing adjustment valve 232 is adjusted to the third position, and the second reversing adjustment valve 233 is adjusted to the fifth position. At this time, the hydraulic pump 22 is started, which can pump the oil in the oil tank 21 into the large chamber of the first hydraulic cylinder 11.

[0098] S20: The first piston 112 of the first hydraulic cylinder 11 reaches position A2 1116.

[0099] S30: Monitor whether the second piston 122 of the second hydraulic cylinder 12 is in position B3 1217. If yes, execute S31; otherwise, execute S321.

[0100] S31: After the adjustment component remains inactive for a duration of T1, execute S40.

[0101] In this embodiment, after the concrete pumping hydraulic system maintains its current working state for a preset time T1, it executes S40.

[0102] S321: If the second piston 122 has not reached B3 position 1217, execute S322; if the second piston 122 has exceeded B3 position 1217, execute S323. In this step, "the second piston 122 has not reached B3 position 1217" specifically means that the second piston 122 is located between B2 position 1216 and B3 position 1217; "the second piston 122 has exceeded B3 position 1217" means that the second piston 122 is located between B3 position 1217 and B4 position 1218.

[0103] S322: The first adjustment group 31 connects the large and small chambers of the first hydraulic cylinder 11 for a time T1 and then closes it, executing S40. In this step, when the second piston 122 is between position B2 1216 and position B3 1217, the oil in the first connecting chamber formed by the small chambers of the first hydraulic cylinder 11 and the second hydraulic cylinder 12 decreases, requiring oil replenishment. Therefore, the first adjustment group 31 connects the large and small chambers of the first hydraulic cylinder 11 to transport the oil in the large chamber to the small chamber. Time T1 is a fixed value. After the large and small chambers of the first hydraulic cylinder 11 are connected for time T1, the large and small chambers of the first hydraulic cylinder 11 are disconnected. If the oil volume b in the first connecting chamber is not equal to a, adjustment continues through subsequent steps or through the next cycle.

[0104] S323: The second adjustment group 32 connects the large and small chambers of the second hydraulic cylinder 12 for a time T1 and then closes it, executing S40. In this step, when the second piston 122 is between position B3 1217 and position B4 1218, there is too much oil in the first connecting chamber formed by the small chambers of the first hydraulic cylinder 11 and the second hydraulic cylinder 12. Therefore, it is necessary to reduce the amount of oil in the first connecting chamber. Thus, the second adjustment group 32 connects the large and small chambers of the second hydraulic cylinder 12 to allow the excess oil in the first connecting chamber to flow to the large chamber of the second hydraulic cylinder 12 first, and then to the oil tank 21. Time T1 is a fixed value. After the large and small chambers of the second hydraulic cylinder 12 are connected for time T1, the large and small chambers of the second hydraulic cylinder 12 are disconnected. If the oil volume b in the first connecting chamber is not equal to a, then the adjustment continues through the subsequent steps in this cycle, or the adjustment is carried out through the next cycle.

[0105] Optionally, S40 specifically includes:

[0106] S401: After time T2, determine whether the first piston 112 of the first hydraulic cylinder 11 exceeds position A1 1115 or whether the second piston 122 of the second hydraulic cylinder 12 exceeds position B4 1218. If yes, execute S41; otherwise, execute S42.

[0107] The purpose of this step is to prevent the first piston 112 from colliding with the top wall of the first cylinder 111 and to prevent the second piston 122 from colliding with the bottom wall of the second cylinder 121.

[0108] S402: If the first piston 112 of the first hydraulic cylinder 11 exceeds position A1 1115, the first adjusting group 31 connects the large and small chambers of the first hydraulic cylinder 11 for a duration of T3 and then closes them; the second adjusting group 32 connects the large and small chambers of the second hydraulic cylinder 12 for a duration of T3 and then closes them. This setting can guide the oil in the large chamber of the first hydraulic cylinder 11 into the small chamber of the first hydraulic cylinder 11, thereby slowing down the movement speed of the first piston 112. At the same time, it guides the oil in the small chamber of the second hydraulic cylinder 12 into the large chamber of the second hydraulic cylinder 12, and then discharges it into the oil tank 21, thus avoiding increasing the movement speed of the second piston 122 while reducing the movement speed of the first piston 112.

[0109] If the second piston 122 of the second hydraulic cylinder 12 exceeds position B4 1218, the second adjusting group 32 connects the large and small chambers of the second hydraulic cylinder 12 for a time T4 and then closes them, and executes S42. This setting allows the oil in the first connecting chamber to be discharged into the oil tank 21 through the large chamber of the second hydraulic cylinder 12, thereby reducing the moving speed of the second piston 122. Since the path of the oil in the large chamber of the first hydraulic cylinder 11 to the oil tank 21 is greater than the path of the oil in the small chamber of the second hydraulic cylinder 12 to the oil tank 21, T4 is less than T3.

[0110] S403; The first piston 112 reaches the extension end of the first cylinder 111 and supplies oil to the large chamber of the second hydraulic cylinder 12.

[0111] In this step, the first reversing regulating valve 232 is adjusted to the first position, thereby enabling the oil in the oil tank 21 to be pumped into the large chamber of the second hydraulic cylinder 12.

[0112] S50: The second piston 122 of the second hydraulic cylinder 12 reaches position B2 1216;

[0113] S60: Monitor whether the first piston 112 of the first hydraulic cylinder 11 is located at position A3 1117. If yes, execute S61; otherwise, execute S621. In this step, if the oil volume b in the first communicating cavity is equal to a, then the first piston 112 is exactly located at position A3 1117. If yes, execute S61; otherwise, execute S621.

[0114] S61: After the adjustment component remains inactive for a duration of T1, execute S70.

[0115] In this embodiment, after the concrete pumping hydraulic system maintains its current working state for a preset time T1, it executes S70.

[0116] S621: If the first piston 112 has not reached A3 bit 1117, then execute S622; if the first piston 112 has exceeded A3 bit 1117, then execute S623.

[0117] In this step, "the first piston 112 not reaching position A3 1117" specifically means that the first piston 112 is located between position A2 1116 and position A3 1117, and "the first piston 112 exceeding position A3 1117" specifically means that the first piston 112 is located between position A3 1117 and position A4 1118.

[0118] S622: The second adjustment group 32 connects the large and small chambers of the second hydraulic cylinder 12 for a time T1 and then closes it, executing S70. In this step, when the first piston 112 is between position A2 1116 and position A3 1117, the oil in the first connecting chamber formed by the small chambers of the first hydraulic cylinder 11 and the second hydraulic cylinder 12 decreases, requiring oil replenishment. Therefore, the second adjustment group 32 connects the large and small chambers of the second hydraulic cylinder 12 to transport the oil in the large chamber to the small chamber. Time T1 is a fixed value. After the large and small chambers of the second hydraulic cylinder 12 are connected for time T1, the large and small chambers of the second hydraulic cylinder 12 are disconnected. If the oil volume b in the first connecting chamber is not equal to a, the adjustment continues in the next cycle.

[0119] S623: The first adjusting group 31 connects the large and small chambers of the first hydraulic cylinder 11 for a time T1 and then closes it, executing S70. In this step, when the first piston 112 is between position A3 1117 and position A4 1118, there is too much oil in the first connecting chamber formed by the small chambers of the first hydraulic cylinder 11 and the second hydraulic cylinder 12. Therefore, it is necessary to reduce the amount of oil in the first connecting chamber. Thus, the first adjusting group 31 connects the large and small chambers of the first hydraulic cylinder 11 to allow the excess oil in the first connecting chamber to flow first to the large chamber of the first hydraulic cylinder 11, and then to the oil tank 21. Time T1 is a fixed value. After the large and small chambers of the first hydraulic cylinder 11 are connected for time T1, the large and small chambers of the first hydraulic cylinder 11 are disconnected. If the oil volume b in the first connecting chamber is not equal to a, then adjustment is performed through subsequent steps in this cycle, or through the next cycle.

[0120] The S70 specifically includes:

[0121] S701: After time T2, determine whether the second piston 122 of the second hydraulic cylinder 12 exceeds position B1 1215 or whether the first piston 112 of the first hydraulic cylinder 11 exceeds position A4 1118. If yes, execute S702; otherwise, execute S703.

[0122] The purpose of this step is to prevent the first piston 112 from colliding with the bottom wall of the first cylinder 111 and to prevent the second piston 122 from colliding with the top wall of the second cylinder 121.

[0123] S702: If the second piston 122 of the second hydraulic cylinder 12 exceeds position B1 1215, the second adjusting group 32 connects the large and small chambers of the second hydraulic cylinder 12 for a duration of T3 and then closes them; the first adjusting group 31 connects the large and small chambers of the first hydraulic cylinder 11 for a duration of T3 and then closes them. This setting can guide the oil in the large chamber of the second hydraulic cylinder 12 into the small chamber of the second hydraulic cylinder 12, thereby slowing down the movement speed of the second piston 122. At the same time, it guides the oil in the small chamber of the first hydraulic cylinder 11 into the large chamber of the first hydraulic cylinder 11, and then discharges it into the oil tank 21, thus avoiding increasing the movement speed of the first piston 112 while decreasing the movement speed of the second piston 122.

[0124] If the first piston 112 of the first hydraulic cylinder 11 exceeds position A4 1118, the first adjusting group 31 connects the large and small chambers of the first hydraulic cylinder 11 for a time T4 and then closes them, and executes S72. This setting allows the oil in the first connecting chamber to be discharged into the oil tank 21 through the large chamber of the first hydraulic cylinder 11, thereby reducing the moving speed of the first piston 112. Since the path of the oil in the large chamber of the second hydraulic cylinder 12 to the oil tank 21 is greater than the path of the oil in the small chamber of the first hydraulic cylinder 11 to the oil tank 21, T4 is less than T3.

[0125] S703; The second piston 122 reaches the extension end of the second cylinder 121 and returns to S10.

[0126] The above steps can make the oil b in the actual first communicating cavity gradually approach a, thereby realizing the synchronous reverse movement of the first hydraulic cylinder 11 and the second hydraulic cylinder 12.

[0127] Optionally, when the large chamber of the first hydraulic cylinder 11 and the large chamber of the second hydraulic cylinder 12 are connected, the concrete pumping hydraulic system is in a low-pressure position. At this time, the large chamber of the first hydraulic cylinder 11 and the large chamber of the second hydraulic cylinder 12 form a second connecting chamber. When the oil volume in the second connecting chamber is A, the first hydraulic cylinder 11 and the second hydraulic cylinder 12 move synchronously in opposite directions. The actual oil volume in the second connecting chamber is B.

[0128] like Figure 3 As shown, the low-pressure gear adjustment method specifically includes:

[0129] D10: Supply oil to the small chamber of the first hydraulic cylinder 11.

[0130] In this step, the shift adjustment valve is adjusted to the second gear, the first reversing adjustment valve 232 is adjusted to the second position, and the second reversing adjustment valve 233 is adjusted to the sixth position. At this time, the oil pump is started, which can pump the oil in the oil tank 21 into the small chamber of the first hydraulic cylinder 11.

[0131] D20: The first piston 112 of the first hydraulic cylinder 11 reaches position A3 1117.

[0132] D30: Monitor whether the second piston 122 of the second hydraulic cylinder 12 is in position B2 1216. If yes, execute D31; otherwise, execute D321.

[0133] D31: After the adjustment component remains inactive for T1 hours, execute D40.

[0134] In this embodiment, after the concrete pumping hydraulic system maintains its current working state for a preset time T1, it executes D40.

[0135] D321: If the second piston 122 does not exceed B2 bit 1216, execute S322; if the second piston exceeds B2 bit 1216, execute S323.

[0136] In this step, "the second piston 122 does not exceed position B2 1216" specifically means that the second piston 122 is located between position B2 1216 and position B3 1217, and "the second piston 122 exceeds position B2 1216" specifically means that the second piston 122 is located between position B1 1215 and position B2 1216.

[0137] D322: After the first adjustment group 31 connects the large and small chambers of the first hydraulic cylinder 11 for a time T1, it closes and executes D40. In this step, when the second piston 122 is between position B2 1216 and position B3 1217, the oil in the second connecting chamber formed by the large chamber of the first hydraulic cylinder 11 and the large chamber of the second hydraulic cylinder 12 decreases, thus requiring oil replenishment. Therefore, the first adjustment group 31 connects the large and small chambers of the first hydraulic cylinder 11 to transport the oil in the small chamber of the first hydraulic cylinder 11 to the large chamber of the first hydraulic cylinder 11. Time T1 is a fixed value. After the large and small chambers of the first hydraulic cylinder 11 are connected for time T1, the large and small chambers of the first hydraulic cylinder 11 are disconnected. If the oil volume B in the second connecting chamber is not equal to A, adjustment is performed through subsequent steps or through the next cycle.

[0138] D323: The second adjustment group 32 connects the large and small chambers of the second hydraulic cylinder 12 for a time T1 and then closes it, executing D40. In this step, when the second piston 122 is between position B1 1215 and position B2 1216, there is too much oil in the second connecting chamber formed by the large chambers of the first hydraulic cylinder 11 and the second hydraulic cylinder 12. Therefore, it is necessary to reduce the amount of oil in the second connecting chamber. Thus, the second adjustment group 32 connects the large and small chambers of the second hydraulic cylinder 12 to allow the excess oil in the second connecting chamber to flow first to the small chamber of the second hydraulic cylinder 12, and then to the oil tank 21. Time T1 is a fixed value. After the large and small chambers of the second hydraulic cylinder 12 are connected for time T1, the large and small chambers of the second hydraulic cylinder 12 are disconnected. If the oil volume b in the second connecting chamber is not equal to a, then adjustment is performed through subsequent steps in this cycle, or through the next cycle.

[0139] Optionally, the D40 specifically includes:

[0140] D401: After time T2, determine whether the first piston 112 of the first hydraulic cylinder 11 exceeds position A4 1118 or whether the second piston 122 of the second hydraulic cylinder 12 exceeds position B1 1215. If yes, execute D402; otherwise, execute D403.

[0141] The purpose of this step is to prevent the first piston 112 from colliding with the top wall of the first cylinder 111 and to prevent the second piston 122 from colliding with the bottom wall of the second cylinder 121.

[0142] D402: If the first piston 112 of the first hydraulic cylinder 11 exceeds position A4 1118, the first adjusting group 31 connects the large and small chambers of the first hydraulic cylinder 11 for a duration of T3 and then closes them; the second adjusting group 32 connects the large and small chambers of the second hydraulic cylinder 12 for a duration of T3 and then closes them. This setting can guide the oil in the small chamber of the first hydraulic cylinder 11 into the large chamber of the first hydraulic cylinder 11, thereby slowing down the movement speed of the first piston 112. At the same time, it guides the oil in the large chamber of the second hydraulic cylinder 12 into the small chamber of the second hydraulic cylinder 12, and then discharges it into the oil tank 21, thus avoiding increasing the movement speed of the second piston 122 while reducing the movement speed of the first piston 112.

[0143] If the second piston 122 of the second hydraulic cylinder 12 exceeds position B1 1215, the second adjusting group 32 connects the large and small chambers of the second hydraulic cylinder 12 for a time T4 and then closes them, and executes S42. This setting allows the oil in the second connecting chamber to be discharged into the oil tank 21 through the small chamber of the second hydraulic cylinder 12, thereby reducing the moving speed of the second piston 122. Since the path of the oil in the small chamber of the first hydraulic cylinder 11 to the oil tank 21 is greater than the path of the oil in the large chamber of the second hydraulic cylinder 12 to the oil tank 21, T4 is less than T3.

[0144] D403; The first piston 112 reaches the closed end of the first cylinder 111 and supplies oil to the small chamber of the second hydraulic cylinder 12.

[0145] In this step, the second reversing regulating valve 233 is adjusted to the fourth position, thereby enabling the oil in the oil tank 21 to be pumped into the large chamber of the first hydraulic cylinder 11.

[0146] D50: The second piston 122 of the second hydraulic cylinder 12 reaches position B3 1217.

[0147] D60: Monitor whether the first piston 112 of the first hydraulic cylinder 11 is located at position A2 1116. If yes, execute D61; otherwise, execute D621. In this step, if the oil volume B in the second communicating cavity is equal to A, then the first piston 112 is exactly located at position A2 1116. If yes, execute D61; otherwise, execute D621.

[0148] D61: After the adjustment component remains inactive for T1 hours, execute D70;

[0149] In this embodiment, after the concrete pumping hydraulic system maintains its current working state for a preset time T1, it executes D70.

[0150] D621: If the first piston 112 does not exceed bit A2 1116, then execute D622; if the first piston 112 exceeds bit A2 1116, then execute D623.

[0151] In this step, "the first piston 112 does not exceed A2 position 1116" specifically means that the first piston 112 is located between A2 position 1116 and A3 position 1117. "The first piston 112 exceeds A2 position 1116" specifically means that the first piston 112 is located between A1 position 1115 and A2 position 1116. Then, S623 is executed.

[0152] D622: The second adjustment group 32 connects the large and small chambers of the second hydraulic cylinder 12 for a time T1 and then closes it, executing D70. In this step, when the first piston 112 is between positions A2 1116 and A3 1117, the oil in the second connecting chamber formed by the large chambers of the first hydraulic cylinder 11 and the second hydraulic cylinder 12 decreases, requiring oil replenishment. Therefore, the second adjustment group 32 connects the large and small chambers of the second hydraulic cylinder 12 to transport the oil in the small chamber to the large chamber. Time T1 is a fixed value. After the large and small chambers of the second hydraulic cylinder 12 are connected for time T1, the large and small chambers are disconnected. If the oil volume B in the second connecting chamber is not equal to A, adjustment is performed in the next cycle.

[0153] D623: The first adjustment group 31 connects the large and small chambers of the first hydraulic cylinder 11 for a time T1 and then closes it, executing D70. In this step, when the first piston 112 is between position A1 1115 and position A2 1116, there is too much oil in the second connecting chamber formed by the large chamber of the first hydraulic cylinder 11 and the large chamber of the second hydraulic cylinder 12. Therefore, it is necessary to reduce the amount of oil in the second connecting chamber. Thus, the first adjustment group 31 connects the large and small chambers of the first hydraulic cylinder 11 to allow the excess oil in the second connecting chamber to flow first to the small chamber of the first hydraulic cylinder 11, and then to the oil tank 21. Time T1 is a fixed value. After the large and small chambers of the first hydraulic cylinder 11 are connected for time T1, the large and small chambers of the first hydraulic cylinder 11 are disconnected. If the oil volume b in the second connecting chamber is not equal to a, then adjustment is performed through subsequent steps in this cycle, or through the next cycle.

[0154] The D70 specifically includes:

[0155] D701: After time T2, determine whether the second piston 122 of the second hydraulic cylinder 12 exceeds position B4 1218 or whether the first piston 112 of the first hydraulic cylinder 11 exceeds position A1 1115. If yes, execute D702; otherwise, execute D703.

[0156] The purpose of this step is to prevent the first piston 112 from colliding with the bottom wall of the first cylinder 111 and to prevent the second piston 122 from colliding with the top wall of the second cylinder 121.

[0157] Specifically, D702 includes: if the second piston 122 of the second hydraulic cylinder 12 exceeds position B4 1218, the second adjusting group 32 connects the large and small chambers of the second hydraulic cylinder 12 for a duration of T3 and then closes them; the first adjusting group 31 connects the large and small chambers of the first hydraulic cylinder 11 for a duration of T3 and then closes them. This setting can guide the oil in the small chamber of the second hydraulic cylinder 12 into the large chamber of the second hydraulic cylinder 12, thereby slowing down the movement speed of the second piston 122. At the same time, it guides the oil in the large chamber of the first hydraulic cylinder 11 into the small chamber of the first hydraulic cylinder 11, and then discharges it into the oil tank 21, thus avoiding increasing the movement speed of the first piston 112 while decreasing the movement speed of the second piston 122.

[0158] If the first piston 112 of the first hydraulic cylinder 11 exceeds position A1 1115, the first adjusting group 31 connects the large and small chambers of the first hydraulic cylinder 11 for a time T4 and then closes them, and executes D72. This setting allows the oil in the second connecting chamber to be discharged into the oil tank 21 through the small chamber of the first hydraulic cylinder 11, thereby reducing the moving speed of the first piston 112. Since the path of the oil in the large chamber of the second hydraulic cylinder 12 to the oil tank 21 is greater than the path of the oil in the small chamber of the first hydraulic cylinder 11 to the oil tank 21, T4 is less than T3.

[0159] D703; The second piston 122 reaches the lower end of the second cylinder 121 and returns to D10.

[0160] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. An automatic adjustment method for a concrete pumping hydraulic system, characterized in that, include: The actuation components include a first hydraulic cylinder (11) and a second hydraulic cylinder (12); The oil supply assembly includes an oil tank (21), a hydraulic pump (22), and a solenoid valve assembly (23). The solenoid valve assembly (23) enables selective communication between the small chamber of the first hydraulic cylinder (11) and the small chamber of the second hydraulic cylinder (12). When the solenoid valve assembly (23) connects the small chamber of the first hydraulic cylinder (11) and the small chamber of the second hydraulic cylinder (12), the solenoid valve assembly (23) supplies oil from the oil tank (21) to the large chamber of the first hydraulic cylinder (11) through the hydraulic pump (22), and the large chamber of the second hydraulic cylinder (12) is connected to the oil tank (21); or the solenoid valve assembly (23) supplies oil from the oil tank (21) to the large chamber of the second hydraulic cylinder (12) through the hydraulic pump (22), and the large chamber of the first hydraulic cylinder (11) is connected to the oil tank (21). The adjustment assembly includes a first adjustment group (31) and a second adjustment group (32). The first adjustment group (31) can connect or disconnect the large and small chambers of the first hydraulic cylinder (11), and the second adjustment group (32) can connect or disconnect the large and small chambers of the second hydraulic cylinder (12). When the small cavity of the first hydraulic cylinder (11) and the small cavity of the second hydraulic cylinder (12) are connected, the concrete pumping hydraulic system is in a high-pressure position, including a high-pressure adjustment method: S10: Supply oil to the large chamber of the first hydraulic cylinder (11); S20: The first piston (112) of the first hydraulic cylinder (11) reaches position A2 (1116). S30: Monitor whether the second piston (122) of the second hydraulic cylinder (12) is in position B3 (1217). If yes, execute S31; otherwise, execute S321. S31: After the adjustment component remains inactive for a period of time T1, S40 is executed; S321: If it is determined that the second piston (122) has not reached the B3 position (1217), then execute S322; if it is determined that the second piston (122) has exceeded the B3 position (1217), then execute S323. S322: The first adjustment group (31) connects the large and small chambers of the first hydraulic cylinder (11) for a time T1 and then closes it, and executes S40; S323: The second adjustment group (32) connects the large chamber and the small chamber of the second hydraulic cylinder (12) for a time of T1 and then closes it, and executes S40; S40 includes S403: the first piston (112) reaches the extension end of the first cylinder (111) and supplies oil to the large chamber of the second hydraulic cylinder (12); S50: The second piston (122) of the second hydraulic cylinder (12) reaches position B2 (1216). S60: Monitor whether the first piston (112) of the first hydraulic cylinder (11) is in position A3 (1117). If yes, execute S61; otherwise, execute S621. S61: After the adjustment component remains inactive for a period of time T1, S70 is executed; S621: If it is determined that the first piston (112) has not reached the A3 position (1117), then execute S622; if it is determined that the first piston (112) has exceeded the A3 position (1117), then execute S623. S622: The second adjustment group (32) connects the large chamber and the small chamber of the second hydraulic cylinder (12) for a time of T1 and then closes it, and executes S70; S623: The first adjustment group (31) connects the large chamber and the small chamber of the first hydraulic cylinder (11) for a time T1 and then closes it, and executes S70; S70 includes S703: the second piston (122) reaches the telescopic end of the second cylinder (121) and returns to S10.

2. The automatic adjustment method for the hydraulic system of a concrete pump according to claim 1, characterized in that, The peripheral wall of the first cylinder body (111) of the first hydraulic cylinder (11) is provided with A1 connection hole (1111), A2 connection hole (1112), A3 connection hole (1113) and A4 connection hole (1114) that communicate with the piston chamber of the first cylinder body (111) along the extension end to the closed end of the first cylinder body (111). The first regulating group (31) includes a first solenoid valve (311) and a second solenoid valve (312). The first solenoid valve (311) is used to control the connection or disconnection of the A1 connection hole (1111) and the A2 connection hole (1112). The second solenoid valve (312) is used to control the connection or disconnection of the A3 connection hole (1113) and the A4 connection hole (1114).

3. The automatic adjustment method for the hydraulic system of a concrete pump according to claim 1, characterized in that, The peripheral wall of the second cylinder body (121) of the second hydraulic cylinder (12) is provided with B1 connecting hole (1211), B2 connecting hole (1212), B3 connecting hole (1213) and B4 connecting hole (1214) that communicate with the piston chamber of the second cylinder body (121) along the extension end to the closed end of the second cylinder body (121). The second regulating group (32) includes a third solenoid valve (321) and a fourth solenoid valve (322). The third solenoid valve (321) is used to control the connection or disconnection of the B1 connection hole (1211) and the B2 connection hole (1212). The fourth solenoid valve (322) is used to control the connection or disconnection of the B3 connection hole (1213) and the B4 connection hole (1214).

4. The automatic adjustment method for the hydraulic system of a concrete pump according to claim 1, characterized in that, The solenoid valve assembly (23) includes a gear adjustment valve (231), which includes a first gear and a second gear. In the first gear, the small chamber of the first hydraulic cylinder (11) and the small chamber of the second hydraulic cylinder (12) are connected. In the second gear, the large chamber of the first hydraulic cylinder (11) and the large chamber of the second hydraulic cylinder (12) are connected. In the second gear position, the solenoid valve assembly (23) supplies oil from the oil tank (21) to the small cavity of the first hydraulic cylinder (11) through the hydraulic pump (22), and the small cavity of the second hydraulic cylinder (12) is connected to the oil tank (21), or the solenoid valve assembly (23) supplies oil from the oil tank (21) to the small cavity of the second hydraulic cylinder (12) through the hydraulic pump (22), and the small cavity of the first hydraulic cylinder (11) is connected to the oil tank (21).

5. The automatic adjustment method for the hydraulic system of a concrete pump according to claim 4, characterized in that, The solenoid valve assembly (23) further includes a first reversing regulating valve (232). The first interface of the first reversing regulating valve (232) is connected to the outlet of the hydraulic pump (22), the second interface is connected to the oil tank (21), the third interface is connected to the large cavity of the first hydraulic cylinder (11), and the fourth interface is connected to the large cavity of the second hydraulic cylinder (12). The first reversing regulating valve (232) includes a first position, a second position, and a third position. In the first position, the first interface is connected to the fourth interface, and the second interface is connected to the third interface. In the second position, the first interface, the second interface, the third interface, and the fourth interface are disconnected from each other. In the third position, the first interface is connected to the third interface, and the second interface is connected to the fourth interface.

6. The automatic adjustment method for the hydraulic system of a concrete pump according to claim 5, characterized in that, The solenoid valve assembly (23) further includes a second reversing regulating valve (233). The fifth port of the second reversing regulating valve (233) is connected to the outlet of the hydraulic pump (22), the sixth port is connected to the oil tank (21), the seventh port is connected to the small cavity of the first hydraulic cylinder (11), and the eighth port is connected to the small cavity of the second hydraulic cylinder (12). The second reversing regulating valve (233) includes a fourth position, a fifth position, and a sixth position. In the fourth position, the fifth port is connected to the eighth port, and the sixth port is connected to the seventh port. In the second position, the fifth port, the sixth port, the seventh port, and the eighth port are disconnected from each other. In the sixth position, the fifth port is connected to the seventh port, and the sixth port is connected to the eighth port.

7. The automatic adjustment method for the hydraulic system of a concrete pump according to claim 1, characterized in that, The solenoid valve assembly (23) also includes an unloading valve (234), one end of which is connected to the outlet of the hydraulic pump (22), and the other end of which is connected to the oil tank (21).

8. The automatic adjustment method for the hydraulic system of a concrete pump according to claim 1, characterized in that, The S40 also includes: S401: After T2 time, determine whether the first piston (112) of the first hydraulic cylinder (11) exceeds position A1 (1115); or whether the second piston (122) of the second hydraulic cylinder (12) exceeds position B4 (1218). If yes, execute S402; otherwise, execute S403. S402: If the first piston (112) of the first hydraulic cylinder (11) exceeds the A1 position (1115), the first adjustment group (31) connects the large and small chambers of the first hydraulic cylinder (11) for a duration of T3 and then closes them. The second adjustment group (32) connects the large and small chambers of the second hydraulic cylinder (12) for a duration of T3 and then closes them. If the second piston (122) of the second hydraulic cylinder (12) exceeds the B4 position (1218), the second adjustment group (32) connects the large and small chambers of the second hydraulic cylinder (12) for a duration of T4 and then closes them. S403 is executed. The S70 also includes: S701: After T2 time, determine whether the second piston (122) of the second hydraulic cylinder (12) exceeds the B1 position (1215), or whether the first piston (112) of the first hydraulic cylinder (11) exceeds the A4 position (1118). If yes, execute S702; otherwise, execute S703. S702: If the second piston (122) of the second hydraulic cylinder (12) exceeds the B1 position (1215), the second adjustment group (32) connects the large and small chambers of the second hydraulic cylinder (12) for a duration of T3 and then closes them. The first adjustment group (31) connects the large and small chambers of the first hydraulic cylinder (11) for a duration of T3 and then closes them. If the first piston (112) of the first hydraulic cylinder (11) exceeds the A4 position (1118), the first adjustment group (31) connects the large and small chambers of the first hydraulic cylinder (11) for a duration of T4 and then closes them. S703 is executed.

9. The automatic adjustment method for the hydraulic system of a concrete pump according to claim 1, characterized in that, The large chamber of the first hydraulic cylinder (11) and the large chamber of the second hydraulic cylinder (12) are connected. The solenoid valve group (23) supplies oil from the oil tank (21) to the small chamber of the first hydraulic cylinder (11) through the hydraulic pump (22). The small chamber of the second hydraulic cylinder (12) is connected to the oil tank (21); or the solenoid valve group (23) supplies oil from the oil tank (21) to the small chamber of the second hydraulic cylinder (12) through the hydraulic pump (22). The small chamber of the first hydraulic cylinder (11) is connected to the oil tank (21). When the large chamber of the first hydraulic cylinder (11) and the large chamber of the second hydraulic cylinder (12) are connected, the concrete pumping hydraulic system is in a low-pressure position, and also includes a low-pressure adjustment method: D10: Supply oil to the small cavity of the first hydraulic cylinder (11); D20: The first piston (112) of the first hydraulic cylinder (11) reaches the A3 position (1117). D30: Monitor whether the second piston (122) of the second hydraulic cylinder (12) is located at position B2 (1216). If yes, execute D31; otherwise, execute D321. D31: After the adjustment component remains inactive for a period of time T1, execute D40; D321: If the second piston (122) does not exceed the B2 bit (1216), then execute S322; if the second piston (122) exceeds the B2 bit (1216), then execute S323. D322: The first adjustment group (31) connects the large and small chambers of the first hydraulic cylinder (11) for a time T1 and then closes it, executing D40; D323: The second adjustment group (32) connects the large and small chambers of the second hydraulic cylinder (12) for a time of T1 and then closes it, and executes D40; D40 includes D403: the first piston (112) reaches the closed end of the first cylinder (111) and supplies oil to the small chamber of the second hydraulic cylinder (12); D50: The second piston (122) of the second hydraulic cylinder (12) reaches the B3 position (1217). D60: Monitor whether the first piston (112) of the first hydraulic cylinder (11) is located at position A2 (1116). If yes, execute D61; otherwise, execute D621. D61: After the adjustment component remains inactive for a period of time T1, execute D70; D621: If it is determined that the first piston (112) has not exceeded the A2 position (1116), then execute D622; if it is determined that the first piston (112) has exceeded the A2 position (1116), then execute D623. D622: The second adjustment group (32) connects the large and small chambers of the second hydraulic cylinder (12) for a time T1 and then closes it, executing D70; D623: The first adjustment group (31) connects the large and small chambers of the first hydraulic cylinder (11) for a time T1 and then closes it, executing D70; D70 includes D703: the second piston (122) reaches the sealed end of the second cylinder (121) and returns to D10.

10. The automatic adjustment method for the hydraulic system of a concrete pump according to claim 9, characterized in that, The D40 also includes: D401: After T2 time, determine whether the first piston (112) of the first hydraulic cylinder (11) exceeds position A4 (1118), or whether the second piston (122) of the second hydraulic cylinder (12) exceeds position B1 (1215). If yes, execute D402; otherwise, execute D403. D402: If the first piston (112) of the first hydraulic cylinder (11) exceeds the A4 position (1118), the first adjustment group (31) connects the large and small chambers of the first hydraulic cylinder (11) for a duration of T3 and then closes them; the second adjustment group (32) connects the large and small chambers of the second hydraulic cylinder (12) for a duration of T3 and then closes them; if the second piston (122) of the second hydraulic cylinder (12) exceeds the B1 position (1215), the second adjustment group (32) connects the large and small chambers of the second hydraulic cylinder (12) for a duration of T4 and then closes them. The D70 also includes: D701: After T2 time, determine whether the second piston (122) of the second hydraulic cylinder (12) exceeds the B4 position (1218), or whether the first piston (112) of the first hydraulic cylinder (11) exceeds the A1 position (1115). If yes, execute D702; otherwise, execute D703. D702; If the second piston (122) of the second hydraulic cylinder (12) exceeds the B4 position (1218), the second adjustment group (32) will connect the large and small chambers of the second hydraulic cylinder (12) for a duration of T3 and then close it, and the first adjustment group (31) will connect the large and small chambers of the first hydraulic cylinder (11) for a duration of T3 and then close it; If the first piston (112) of the first hydraulic cylinder (11) exceeds the A1 position (1115), the first adjustment group (31) will connect the large and small chambers of the first hydraulic cylinder (11) for a duration of T4 and then close it.

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