Hydraulic control system, counterweight weight detection and pressure adjustment methods

Abstract

This invention relates to the field of hydraulic system technology, and provides a hydraulic control system, a method for counterweight weight detection, and a method for pressure adjustment. The hydraulic control system includes a counterweight cylinder assembly, a counterweight control valve assembly, a pressure oil control valve, a pressure regulating valve, a control device, a pressure oil source, and an oil tank. The pressure oil control valve controls the connection state between the pressure oil source and the counterweight control valve assembly, and the counterweight control valve assembly controls the connection state between the pressure oil control valve, the oil tank, and the rod-side and rodless-side chambers of the counterweight cylinder assembly. Embodiments of this invention can reduce high-pressure overflow waste during the operation of the hydraulic control system and improve the stability of the counterweight cylinder assembly during load lifting.

Description

Technical Field

[0001] This invention relates to the field of hydraulic system technology, and in particular to a hydraulic control system, a method for counterweight detection and pressure adjustment. Background Technology

[0002] To ensure the safety of crane operations, counterweights are typically installed on cranes. Currently, most cranes use hydraulic control systems as the power drive for installing and releasing counterweights. To improve the smoothness and reliability of the hydraulic control system, pressure regulating valves are usually installed. However, the pressure setting of the pressure regulating valves in existing hydraulic control systems is usually based on empirical values, which cannot meet the precise pressure supply requirements under different operating conditions. This inevitably leads to significant high-pressure overflow waste and poor stability of the counterweight cylinder during use. Summary of the Invention

[0003] This invention provides a hydraulic control system, a counterweight detection method, and a pressure adjustment method to solve the problems of large high-pressure overflow waste and relatively poor cylinder operation stability in existing hydraulic control systems.

[0004] According to a first aspect of the present invention, a hydraulic control system is provided, comprising a counterweight cylinder assembly, a counterweight control valve assembly, a pressure oil control valve, a pressure regulating valve, a control device, a pressure oil source, and an oil tank.

[0005] The pressure oil source is connected to the pressure oil control valve. The pressure oil control valve and the oil tank are connected to the counterweight control valve assembly. The counterweight control valve assembly is connected to the rod-side and rodless-side chambers of the counterweight cylinder assembly. The pressure oil control valve is used to control the communication state between the pressure oil source and the counterweight control valve assembly. The counterweight control valve assembly is used to control the communication state between the pressure oil control valve, the oil tank, and the rod-side and rodless-side chambers of the counterweight cylinder assembly.

[0006] The pressure output port of the pressure oil control valve is connected to the pressure regulating valve of the counterweight control valve assembly. The control device is connected to the counterweight control valve assembly, the pressure oil control valve, and the pressure regulating valve. The control device is used to determine the weight of the counterweight block based on the working state of the counterweight cylinder assembly, the pressure of the rodless and rod chambers of the counterweight cylinder assembly, and the effective area of ​​the rodless and rod chambers of the counterweight cylinder assembly. It also adapts and adjusts the set pressure of the pressure regulating valve of the counterweight cylinder assembly in different working states under the corresponding counterweight weight based on the pressure of the rod and rodless chambers of the counterweight cylinder assembly.

[0007] According to a hydraulic control system provided by the present invention, the counterweight cylinder assembly includes a first counterweight cylinder and a second counterweight cylinder. The counterweight control valve assembly includes a first counterweight control valve and a second counterweight control valve.

[0008] The pressure output port of the pressure oil control valve and the oil tank are connected to the first counterweight control valve and the second counterweight control valve. The first counterweight control valve is connected to the rod-side and rodless-side chambers of the first counterweight cylinder. The first counterweight control valve controls the communication between the pressure output port of the pressure oil control valve, the oil tank, and the rod-side and rodless-side chambers of the first counterweight cylinder. The second counterweight control valve is connected to the rod-side and rodless-side chambers of the second counterweight cylinder. The second counterweight control valve controls the communication between the pressure output port of the pressure oil control valve, the oil tank, and the rod-side and rodless-side chambers of the second counterweight cylinder.

[0009] According to a hydraulic control system provided by the present invention, the pressure oil control valve is provided with at least an oil supply position and an unloading position. The oil inlet of the pressure oil control valve is connected to the pressure oil source. The oil return port of the pressure oil control valve is connected to the oil tank. In the oil supply position, the oil inlet of the pressure oil control valve is connected to the pressure output port of the pressure oil control valve; in the unloading position, the oil inlet of the pressure oil control valve is connected to the oil return port of the pressure oil control valve.

[0010] According to a hydraulic control system provided by the present invention, the first counterweight control valve is provided with at least a first counterweight lifting position and a first counterweight lowering position. When the pressure oil control valve is switched to the oil supply position and the first counterweight control valve is switched to the first counterweight lifting position, the pressure oil source is connected to the rod-side chamber of the first counterweight cylinder, and the rodless chamber of the first counterweight cylinder is connected to the oil tank. When the pressure oil control valve is switched to the oil supply position and the first counterweight control valve is switched to the first counterweight lowering position, the pressure oil source is connected to the rodless chamber of the first counterweight cylinder, and the rod-side chamber of the first counterweight cylinder is connected to the oil tank.

[0011] The second counterweight control valve has at least a second counterweight lifting position and a second counterweight lowering position. When the pressure oil control valve is switched to the oil supply position and the second counterweight control valve is switched to the second counterweight lifting position, the pressure oil source is connected to the rod-side chamber of the second counterweight cylinder, and the rodless chamber of the second counterweight cylinder is connected to the oil tank. When the pressure oil control valve is switched to the oil supply position and the second counterweight control valve is switched to the second counterweight lowering position, the pressure oil source is connected to the rodless chamber of the second counterweight cylinder, and the rod-side chamber of the second counterweight cylinder is connected to the oil tank.

[0012] According to a hydraulic control system provided by the present invention, a first pressure sensor is installed in the rod chamber of the first counterweight cylinder. A second pressure sensor is installed in the rodless chamber of the first counterweight cylinder. A third pressure sensor is installed in the rod chamber of the second counterweight cylinder. A fourth pressure sensor is installed in the rodless chamber of the second counterweight cylinder. The control device is connected to the first counterweight control valve, the second counterweight control valve, the first pressure sensor, the second pressure sensor, the third pressure sensor, and the fourth pressure sensor.

[0013] The control device is used to determine the weight of the first counterweight based on the working position of the first counterweight control valve, the detection results of the first pressure sensor and the second pressure sensor, and the effective area of ​​the rod chamber and rodless chamber of the first counterweight cylinder; or, to determine the weight of the second counterweight based on the working position of the second counterweight control valve, the detection results of the third pressure sensor and the fourth pressure sensor, and the effective area of ​​the rod chamber and rodless chamber of the second counterweight cylinder.

[0014] Furthermore, based on the working positions of the first counterweight control valve and the pressure oil control valve, and the pressure of the rod chamber and rodless chamber of the first counterweight cylinder, the pressure regulating valve is set to adjust the pressure of the first counterweight cylinder in different operating states under the corresponding weight of the first counterweight block; or, based on the working positions of the second counterweight control valve and the pressure oil control valve, and the pressure of the rod chamber and rodless chamber of the second counterweight cylinder, the pressure regulating valve is set to adjust the pressure of the second counterweight cylinder in different operating states under the corresponding weight of the second counterweight block.

[0015] According to a hydraulic control system provided by the present invention, the hydraulic control system further includes a swing cylinder and a swing control valve. The swing cylinder is connected to the counterweight cylinder assembly and is used to adjust the position of the counterweight cylinder assembly. The swing control valve is connected to the pressure output port of the pressure oil control valve, the oil tank, and the rod-side and rodless-side chambers of the swing cylinder.

[0016] The swing control valve has at least a swing extension position and a swing retraction position. When the pressure oil control valve is switched to the oil supply position and the swing control valve is switched to the swing extension position, the pressure oil source is connected to the rodless chamber of the swing cylinder, and the rod chamber of the swing cylinder is connected to the oil tank. When the pressure oil control valve is switched to the oil supply position and the swing control valve is switched to the swing retraction position, the pressure oil source is connected to the rod chamber of the swing cylinder, and the rodless chamber of the swing cylinder is connected to the oil tank.

[0017] According to a hydraulic control system provided by the present invention, a fifth pressure sensor is installed in the rod chamber and / or rodless chamber of the swing cylinder. The control device is connected to the swing control valve and the fifth pressure sensor, and is used to adjust the set pressure of the pressure regulating valve of the swing cylinder in the contracted and / or extended states under the corresponding counterweight weight based on the working state of the counterweight cylinder group, the working position of the swing control valve, and the detection result of the fifth pressure sensor.

[0018] According to a second aspect of the present invention, a method for counterweight detection and pressure adjustment based on the above-described hydraulic control system is provided, comprising the following steps:

[0019] Switch the working state of the counterweight control valve group and the pressure oil control valve so that the counterweight cylinder group falls without load.

[0020] Connect the counterweight cylinder assembly to the counterweight block, and switch the working state of the counterweight control valve assembly and the pressure oil control valve so that the counterweight cylinder assembly can lift under load.

[0021] The control device determines the weight of the counterweight and the set pressure of the pressure regulating valve in the load-bearing lifting state of the counterweight cylinder assembly under the corresponding counterweight weight.

[0022] Switch the working state of the counterweight control valve group and the pressure oil control valve to make the counterweight cylinder group fall with load;

[0023] The control device determines the set pressure of the pressure regulating valve during the load-bearing descent of the counterweight cylinder assembly under the corresponding counterweight weight.

[0024] According to the method for counterweight detection and pressure adjustment provided by the present invention, the steps of the control device determining the weight of the counterweight and determining the set pressure of the pressure regulating valve in the load-bearing lifting state of the counterweight cylinder assembly under the corresponding counterweight weight specifically include:

[0025] The control device determines that the counterweight cylinder group is in a loaded lifting state based on the pressure difference between the rod chamber and the rodless chamber of the counterweight cylinder group, the working status of the counterweight control valve group and the pressure oil control valve, and determines the weight of the counterweight block based on the pressure difference between the rodless chamber and the rod chamber of the counterweight cylinder group and the difference in the effective area between the rodless chamber and the rod chamber of the counterweight cylinder group.

[0026] The set pressure of the pressure regulating valve in the load-bearing lifting state of the counterweight cylinder assembly is determined based on the pressure difference between the rodless chamber and the rod chamber of the counterweight cylinder assembly under the corresponding counterweight weight.

[0027] The steps by which the control device determines the set pressure of the pressure regulating valve during the load-bearing descent of the counterweight cylinder assembly under the corresponding counterweight weight specifically include:

[0028] The control device determines whether the counterweight cylinder group is in a loaded falling state based on the pressure difference between the rod chamber and the rodless chamber of the counterweight cylinder group, the working status of the counterweight control valve group and the pressure oil control valve, and determines the set pressure of the pressure regulating valve in the loaded falling state of the counterweight cylinder group under the corresponding counterweight weight based on the pressure difference between the rodless chamber and the rod chamber of the counterweight cylinder group.

[0029] According to the present invention, a method for detecting the weight of a counterweight and adjusting its pressure is provided, the method further includes:

[0030] The control device determines whether the counterweight cylinder assembly is under load based on the pressure difference between the rod chamber and the rodless chamber of the counterweight cylinder assembly.

[0031] The control device determines the set pressure of the pressure regulating valve of the swing cylinder in the contracted and / or extended state under the weight of the corresponding counterweight based on the working position of the swing control valve and the pressure difference between the rod chamber and the rodless chamber of the swing cylinder.

[0032] In the hydraulic control system provided by this invention, a pressure oil source is connected to the inlet of a pressure oil control valve, the pressure output port of the pressure oil control valve and the oil tank are connected to a counterweight control valve assembly, and the counterweight control valve assembly is connected to the rod chamber and rodless chamber of the counterweight cylinder. When the inlet of the pressure oil control valve is connected to the pressure output port, the pressure oil source can supply oil to the rod chamber or rodless chamber of the counterweight cylinder assembly through the counterweight control valve assembly, and the oil in the rod chamber or rodless chamber of the counterweight cylinder assembly can flow back to the oil tank through the counterweight control valve assembly.

[0033] A pressure regulating valve is installed between the pressure output port of the pressure oil control valve and the counterweight control valve assembly. The control device is connected to the counterweight control valve assembly and the pressure oil control valve. The control device can determine the working state of the counterweight cylinder assembly based on the working states of the counterweight control valve assembly and the pressure oil control valve, and the pressure difference between the rod-side and rodless-side chambers of the counterweight cylinder assembly. The working states of the counterweight cylinder assembly include at least unloaded extension and descent, loaded retraction and lifting, and loaded extension and descent. For example, when the pressure oil source supplies oil to the rodless chamber of the counterweight cylinder assembly through the pressure oil control valve and the counterweight control valve, and there is no pressure difference between the rod and rodless chambers of the counterweight cylinder assembly, it indicates that the counterweight cylinder assembly is in an unloaded extended and lowered state; when the pressure oil source supplies oil to the rod chamber of the counterweight cylinder assembly through the pressure oil control valve and the counterweight control valve, and there is a pressure difference between the rod and rodless chambers of the counterweight cylinder assembly, it indicates that the counterweight cylinder assembly is in a loaded retracted and lifted state; when the pressure oil source supplies oil to the rodless chamber of the counterweight cylinder assembly through the pressure oil control valve and the counterweight control valve, and there is a pressure difference between the rod and rodless chambers of the counterweight cylinder assembly, it indicates that the counterweight cylinder assembly is in a loaded extended and lowered state.

[0034] During operation, the counterweight cylinder assembly first extends and lowers under no-load to the counterweight block, connects with the counterweight block, and then retracts and lifts under load to its limit position to complete the counterweight installation. After the machine finishes its work, the counterweight cylinder assembly extends and lowers under load to release the counterweight block. During the retraction and lifting process under load, the control device can determine the weight of the counterweight block based on the pressure and effective area of ​​the rodless and rod-side chambers of the counterweight cylinder assembly. Specifically, the weight of the counterweight block = pressure in the rod-side chamber of the counterweight cylinder assembly × effective area of ​​the rod-side chamber of the counterweight cylinder assembly - pressure in the rodless chamber of the counterweight cylinder assembly × effective area of ​​the rodless chamber of the counterweight cylinder assembly.

[0035] During the retraction and lifting process of the counterweight cylinder assembly under load, the control device can determine the set pressure value of the pressure regulating valve based on the pressure in the rod chamber of the counterweight cylinder assembly under the weight of the counterweight. That is, the control device can accurately adjust the set pressure of the pressure regulating valve during the retraction and lifting state of the counterweight cylinder assembly under the weight of the counterweight based on the pressure in the rod chamber of the counterweight cylinder assembly. In subsequent operations, when the counterweight cylinder assembly is lifted with a counterweight of the corresponding weight, the control device can automatically adjust the working pressure of the pressure regulating valve to the corresponding set pressure value. Similarly, during the extension and descent process of the counterweight cylinder assembly under load, the control device can also accurately adjust the set pressure of the pressure regulating valve during the extension and descent state of the counterweight cylinder assembly under the weight of the counterweight based on the pressure in the rodless chamber of the counterweight cylinder assembly. In subsequent operations, when the counterweight cylinder assembly is lowered with a counterweight of the corresponding weight, the control device can automatically adjust the working pressure of the pressure regulating valve to the corresponding set pressure value.

[0036] With this structural design, the control device can detect the weight of the counterweight block mounted on the counterweight cylinder assembly and accurately adjust the set pressure of the pressure regulating valve during the lifting and lowering of the counterweight cylinder assembly under the corresponding counterweight weight. This allows for precise matching and adjustment of the pressure regulating valve set pressure for different working conditions in subsequent operations. Consequently, it reduces high-pressure overflow waste in the hydraulic control system during operation, lowers overflow heat generation, extends the service life of hydraulic components, and improves the stability of the counterweight cylinder assembly during lifting and lowering under load. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1This is a system schematic diagram of the hydraulic control system provided by the present invention;

[0039] Figure 2 This is a flowchart of the counterweight weight detection and pressure adjustment method provided by the present invention;

[0040] Figure label:

[0041] 100. First counterweight cylinder; 110. First counterweight control valve; 111. First counterweight lifting position; 112. First counterweight lowering position; 200. Second counterweight cylinder; 210. Second counterweight control valve; 211. Second counterweight lifting position; 212. Second counterweight lowering position; 310. Pressure oil source; 320. Oil tank; 330. Pressure oil control valve; 331. Oil supply position; 332. Unloading position; 400. Pressure regulating valve; 510. First pressure sensor; 520. Second pressure sensor; 530. Third pressure sensor; 540. Fourth pressure sensor; 600. Swing cylinder; 610. Swing control valve; 611. Swing extension position; 612. Swing retraction position. Detailed Implementation

[0042] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0043] In the description of the embodiments of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "first," "second," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0044] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention according to the specific circumstances.

[0045] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0046] In the description of this specification, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate different embodiments or examples and features of different embodiments or examples described in this specification to make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer. The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. 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.

[0047] The following is combined Figure 1 and Figure 2 This invention describes a hydraulic control system, a counterweight detection method, and a pressure adjustment method provided by an embodiment of the present invention. It should be understood that the following description is merely an illustrative embodiment of the present invention and does not constitute any particular limitation on the present invention.

[0048] An embodiment of the first aspect of the present invention provides a hydraulic control system, such as Figure 1 As shown, the hydraulic control system includes a counterweight cylinder assembly, a counterweight control valve assembly, a pressure oil control valve 330, a pressure regulating valve 400, a control device, a pressure oil source 310, and an oil tank 320.

[0049] The pressure oil source 310 is connected to the pressure oil control valve 330. The pressure oil control valve 330 and the oil tank 320 are connected to the counterweight control valve assembly. The counterweight control valve assembly is connected to the rod-side and rodless-side chambers of the counterweight cylinder assembly. The pressure oil control valve 330 is used to control the communication between the pressure oil source 310 and the counterweight control valve assembly. The counterweight control valve assembly is used to control the communication between the pressure oil control valve 330, the oil tank 320, and the rod-side and rodless-side chambers of the counterweight cylinder assembly.

[0050] The pressure output port of the pressure oil control valve 330 is connected to the pressure regulating valve 400 between the pressure oil control valve assembly and the counterweight control valve assembly. The control device is connected to the counterweight control valve assembly, the pressure oil control valve 330, and the pressure regulating valve 400. The control device is used to determine the weight of the counterweight based on the working state of the counterweight cylinder assembly, the pressure in the rodless and rod chambers of the counterweight cylinder assembly, and the effective area of ​​the rodless and rod chambers of the counterweight cylinder assembly. It also adapts and adjusts the set pressure of the pressure regulating valve 400 of the counterweight cylinder assembly under different working states for the corresponding counterweight weight based on the pressure in the rod and rodless chambers of the counterweight cylinder assembly.

[0051] In the hydraulic control system provided by this invention, the pressure oil source 310 is connected to the inlet of the pressure oil control valve 330, the pressure output port of the pressure oil control valve 330 and the oil tank 320 are connected to the counterweight control valve assembly, and the counterweight control valve assembly is connected to the rod chamber and rodless chamber of the counterweight cylinder. When the inlet of the pressure oil control valve 330 is connected to the pressure output port, the pressure oil source 310 can supply oil to the rod chamber or rodless chamber of the counterweight cylinder assembly through the counterweight control valve assembly, and the oil in the rodless chamber or rod chamber of the counterweight cylinder assembly can flow back to the oil tank 320 through the counterweight control valve assembly.

[0052] A pressure regulating valve 400 is installed between the pressure output port of the pressure oil control valve 330 and the counterweight control valve assembly. A control device is connected to the counterweight control valve assembly and the pressure oil control valve 330. The control device can determine the working state of the counterweight cylinder assembly based on the working states of the counterweight control valve assembly and the pressure oil control valve 330, and the pressure difference between the rod-side and rodless-side chambers of the counterweight cylinder assembly. The working states of the counterweight cylinder assembly include at least unloaded extension and descent, loaded retraction and lifting, and loaded extension and descent. For example, when the pressure oil source 310 supplies oil to the rodless chamber of the counterweight cylinder assembly through the pressure oil control valve 330 and the counterweight control valve, and there is no pressure difference between the rod chamber and the rodless chamber of the counterweight cylinder assembly, it indicates that the counterweight cylinder assembly is in an unloaded extended and lowered state; when the pressure oil source 310 supplies oil to the rod chamber of the counterweight cylinder assembly through the pressure oil control valve 330 and the counterweight control valve, and there is a pressure difference between the rod chamber and the rodless chamber of the counterweight cylinder assembly, it indicates that the counterweight cylinder assembly is in a loaded retracted and lifted state; when the pressure oil source 310 supplies oil to the rodless chamber of the counterweight cylinder assembly through the pressure oil control valve 330 and the counterweight control valve, and there is a pressure difference between the rod chamber and the rodless chamber of the counterweight cylinder assembly, it indicates that the counterweight cylinder assembly is in a loaded extended and lowered state.

[0053] During operation, the counterweight cylinder assembly first extends and lowers under no-load to the counterweight block, connects with the counterweight block, and then retracts and lifts under load to its limit position to complete the counterweight installation. After the machine finishes its work, the counterweight cylinder assembly extends and lowers under load to release the counterweight block. During the retraction and lifting process under load, the control device can determine the weight of the counterweight block based on the pressure and effective area of ​​the rodless and rod-side chambers of the counterweight cylinder assembly. Specifically, the weight of the counterweight block = pressure in the rod-side chamber of the counterweight cylinder assembly × effective area of ​​the rod-side chamber of the counterweight cylinder assembly - pressure in the rodless chamber of the counterweight cylinder assembly × effective area of ​​the rodless chamber of the counterweight cylinder assembly.

[0054] During the retraction and lifting process of the counterweight cylinder assembly under load, the control device can determine the set pressure value of the pressure regulating valve 400 based on the pressure in the rod chamber of the counterweight cylinder assembly, under the weight of the counterweight. That is, the control device can accurately adjust the set pressure of the pressure regulating valve 400 during the retraction and lifting state of the counterweight cylinder assembly under the weight of the counterweight based on the pressure in the rod chamber of the counterweight cylinder assembly. In subsequent operations, when the counterweight cylinder assembly is loaded with a counterweight of the corresponding weight for lifting, the control device can automatically adjust the working pressure of the pressure regulating valve 400 to the corresponding set pressure value. Similarly, during the extension and descent process of the counterweight cylinder assembly under load, the control device can also accurately adjust the set pressure of the pressure regulating valve 400 during the extension and descent state of the counterweight cylinder assembly under the weight of the counterweight based on the pressure in the rodless chamber of the counterweight cylinder assembly. In subsequent operations, when the counterweight cylinder assembly is lowered with a counterweight of the corresponding weight, the control device can automatically adjust the working pressure of the pressure regulating valve 400 to the corresponding set pressure value.

[0055] With this structural design, the control device can detect the weight of the counterweight block mounted on the counterweight cylinder assembly and accurately adjust the set pressure of the pressure regulating valve 400 during the lifting and lowering of the counterweight cylinder assembly under the corresponding counterweight weight. This allows for precise matching and adjustment of the pressure regulating valve 400's set pressure for different working conditions in subsequent operations. This reduces high-pressure overflow waste in the hydraulic control system during operation, lowers overflow heat generation, extends the service life of hydraulic components, and improves the stability of the counterweight cylinder assembly during lifting and lowering under load.

[0056] In one embodiment of the present invention, the counterweight cylinder assembly includes a first counterweight cylinder 100 and a second counterweight cylinder 200. The counterweight control valve assembly includes a first counterweight control valve 110 and a second counterweight control valve 210.

[0057] The pressure output port of the pressure oil control valve 330 and the oil tank 320 are connected to the first counterweight control valve 110 and the second counterweight control valve 210. The first counterweight control valve 110 is connected to the rod chamber and the rodless chamber of the first counterweight cylinder 100. The first counterweight control valve 110 is used to control the communication state between the pressure output port of the pressure oil control valve 330, the oil tank 320, and the rod chamber and the rodless chamber of the first counterweight cylinder 100. The second counterweight control valve 210 is connected to the rod chamber and the rodless chamber of the second counterweight cylinder 200. The second counterweight control valve 210 is used to control the communication state between the pressure output port of the pressure oil control valve 330, the oil tank 320, and the rod chamber and the rodless chamber of the second counterweight cylinder 200.

[0058] In one embodiment of the present invention, the pressure oil control valve 330 is provided with at least an oil supply position 331 and an unloading position 332. The oil inlet of the pressure oil control valve 330 is connected to the pressure oil source 310. The oil return port of the pressure oil control valve 330 is connected to the oil tank 320. In the oil supply position 331, the oil inlet of the pressure oil control valve 330 is connected to the pressure output port of the pressure oil control valve 330; in the unloading position 332, the oil inlet of the pressure oil control valve 330 is connected to the oil return port of the pressure oil control valve 330.

[0059] Furthermore, in one embodiment of the present invention, the first counterweight control valve 110 is provided with at least a first counterweight lifting position 111 and a first counterweight lowering position 112. When the pressure oil control valve 330 is switched to the oil supply position 331 and the first counterweight control valve 110 is switched to the first counterweight lifting position 111, the pressure oil source 310 is connected to the rod chamber of the first counterweight cylinder 100, and the rodless chamber of the first counterweight cylinder 100 is connected to the oil tank 320; when the pressure oil control valve 330 is switched to the oil supply position 331 and the first counterweight control valve 110 is switched to the first counterweight lowering position 112, the pressure oil source 310 is connected to the rodless chamber of the first counterweight cylinder 100, and the rod chamber of the first counterweight cylinder 100 is connected to the oil tank 320.

[0060] The second counterweight control valve 210 is provided with at least a second counterweight lifting position 211 and a second counterweight lowering position 212. When the pressure oil control valve 330 is switched to the oil supply position 331 and the second counterweight control valve 210 is switched to the second counterweight lifting position 211, the pressure oil source 310 is connected to the rod chamber of the second counterweight cylinder 200, and the rodless chamber of the second counterweight cylinder 200 is connected to the oil tank 320; when the pressure oil control valve 330 is switched to the oil supply position 331 and the second counterweight control valve 210 is switched to the second counterweight lowering position 212, the pressure oil source 310 is connected to the rodless chamber of the second counterweight cylinder 200, and the rod chamber of the second counterweight cylinder 200 is connected to the oil tank 320.

[0061] Specifically, such as Figure 1 As shown, the pressure oil control valve 330 is a two-position three-way solenoid directional valve, including an inlet port, a return port, and a pressure output port. The first counterweight control valve 110 is a first three-position four-way solenoid directional valve, including a first working port, a second working port, a third working port, and a fourth working port. The second counterweight control valve 210 includes a second three-position four-way solenoid directional valve, including a fifth working port, a sixth working port, a seventh working port, and an eighth working port. The inlet port of the two-position three-way solenoid directional valve is connected to the pressure oil source 310. The pressure oil source 310 includes, but is not limited to, a hydraulic pump. The return port of the two-position three-way solenoid directional valve is connected to the oil tank 320. The pressure output port of the two-position three-way solenoid directional valve is connected to the first working port of the first three-position four-way solenoid directional valve and the fifth working port of the second three-position four-way solenoid directional valve, respectively. The second working port of the first three-position four-way solenoid directional valve is connected to the oil tank 320, the third working port is connected to the rodless chamber of the first counterweight cylinder 100, and the fourth working port is connected to the rod chamber of the first counterweight cylinder 100. The sixth working port of the second three-position four-way solenoid directional valve is connected to the oil tank 320, the seventh working port is connected to the rodless chamber of the second counterweight cylinder 200, and the eighth working port is connected to the rod chamber of the second counterweight cylinder 200.

[0062] The two-position three-way solenoid directional valve has an oil supply position 331 and an unloading position 332. Its solenoid control terminal is DT01. When DT01 is energized, the two-position three-way solenoid directional valve switches to the oil supply position 331, and its oil inlet is connected to the pressure output oil port, so that the pressure oil source 310 can supply oil to the first counterweight control valve 110 and the second counterweight control valve 210. When DT01 is de-energized, the two-position three-way solenoid directional valve switches to the unloading position 332, and the pressure oil source 310 is unloaded into the oil tank 320.

[0063] In addition to the first counterweight lifting position 111 and the first counterweight lowering position 112, the first three-position four-way solenoid directional valve may also have a first counterweight cut-off position. The two solenoid control terminals of the first three-position four-way solenoid directional valve are DT1 and DT2, respectively. When DT1 is energized, the first working port of the first three-position four-way solenoid directional valve is connected to the fourth working port, and the second working port is connected to the third working port. If DT01 is energized at the same time, the pressure oil source 310 can be supplied to the rod chamber of the first counterweight cylinder 100 through the two-position three-way solenoid directional valve and the first three-position four-way solenoid directional valve. The oil in the rodless chamber of the first counterweight cylinder 100 can flow back to the oil tank 320, and the piston rod of the first counterweight cylinder 100 retracts and rises. When DT2 is energized, the first working port of the first three-position four-way solenoid directional valve is connected to the third working port, and the second working port is connected to the fourth working port. If DT01 is energized at the same time, the pressure oil source 310 can be supplied to the rodless chamber of the first counterweight cylinder 100 through the two-position three-way solenoid directional valve and the first three-position four-way solenoid directional valve. The oil in the rod chamber of the first counterweight cylinder 100 can flow back to the oil tank 320, and the piston rod of the first counterweight cylinder 100 extends and falls.

[0064] The operation of the second counterweight control valve 210 is similar and will not be described in detail here. For example, the two solenoid control terminals of the second three-position four-way solenoid directional valve are DT3 and DT4, respectively. When DT3 and DT01 are energized simultaneously, the pressure oil source 310 can supply oil to the rod chamber of the second counterweight cylinder 200 through the two-position three-way solenoid directional valve and the second three-position four-way solenoid directional valve. The oil in the rodless chamber of the second counterweight cylinder 200 can flow back to the oil tank 320, and the piston rod of the second counterweight cylinder 200 retracts and rises. When DT2 and DT01 are energized simultaneously, the pressure oil source 310 can supply oil to the rodless chamber of the second counterweight cylinder 200 through the two-position three-way solenoid directional valve and the second three-position four-way solenoid directional valve. The oil in the rod chamber of the second counterweight cylinder 200 can flow back to the oil tank 320, and the piston rod of the second counterweight cylinder 200 extends and falls.

[0065] As described in the above embodiments, in this hydraulic control system, the first counterweight cylinder 100 is connected to the first counterweight block, and the second counterweight cylinder 200 is connected to the second counterweight block. The first counterweight cylinder 100 and the second counterweight cylinder 200 are independent of each other, allowing for synchronous or independent adjustment of the height of the first and second counterweight blocks. When the positions of the first and second counterweight blocks are tilted vertically, unilateral position adjustment and correction are easily performed.

[0066] In one embodiment of the present invention, such as Figure 1 As shown, a first pressure sensor 510 is installed in the rod-side chamber of the first counterweight cylinder 100, a second pressure sensor 520 is installed in the rodless chamber of the first counterweight cylinder 100, a third pressure sensor 530 is installed in the rod-side chamber of the second counterweight cylinder 200, and a fourth pressure sensor 540 is installed in the rodless chamber of the second counterweight cylinder 200. The control device is connected to the first counterweight control valve 110, the second counterweight control valve 210, the first pressure sensor 510, the second pressure sensor 520, the third pressure sensor 530, and the fourth pressure sensor 540.

[0067] The control device is used to determine the weight of the first counterweight based on the working position of the first counterweight control valve 110, the detection results of the first pressure sensor 510 and the second pressure sensor 520, and the effective area of ​​the rod chamber and rodless chamber of the first counterweight cylinder 100; or, based on the working position of the second counterweight control valve 210, the detection results of the third pressure sensor 530 and the fourth pressure sensor 540, and the effective area of ​​the rod chamber and rodless chamber of the second counterweight cylinder 200.

[0068] Furthermore, based on the working positions of the first counterweight control valve 110 and the pressure oil control valve 330, and the pressure of the rod chamber and rodless chamber of the first counterweight cylinder 100, the pressure regulating valve 400 is adjusted and set according to the weight of the first counterweight block under different operating states; or, based on the working positions of the second counterweight control valve 210 and the pressure oil control valve 330, and the pressure of the rod chamber and rodless chamber of the second counterweight cylinder 200, the pressure regulating valve 400 is adjusted and set according to the weight of the second counterweight block under different operating states.

[0069] For example, the control device determines that the first counterweight cylinder 100 is in a loaded lifting state based on the following: the pressure oil control valve 330 is in the oil supply position 331, the first counterweight control valve 110 is in the first counterweight lifting position 111, and the product of the detection result of the first pressure sensor 510 and the effective area of ​​the rod chamber of the first counterweight cylinder 100 is greater than the product of the detection result of the second pressure sensor 520 and the effective area of ​​the rodless chamber of the first counterweight cylinder 100. At this time, the control device determines the weight of the first counterweight based on the detection results of the first pressure sensor 510 and the second pressure sensor 520 and the effective areas of the rod and rodless chambers of the first counterweight cylinder 100. The weight of the first counterweight =

[0070] The pressure in the rod chamber of the first counterweight cylinder 100 × the effective area of ​​the rod chamber of the first counterweight cylinder 100 - the pressure in the rodless chamber of the first counterweight cylinder 100 × the effective area of ​​the rodless chamber of the first counterweight cylinder 100. In this embodiment, the weight of the first counterweight block = the detection result of the first pressure sensor 510 × the effective area of ​​the rod chamber of the first counterweight cylinder 100 - the detection structure of the second pressure sensor 520 × the effective area of ​​the rodless chamber of the first counterweight cylinder 100.

[0071] During the lifting process of the first counterweight cylinder 100 under load, the control device adapts the set pressure value of the pressure regulating valve 400 to the corresponding weight of the first counterweight block under the pressure detection result of the first pressure sensor 510. It should be noted that the pressure regulating valve 400 has a certain pressure loss. When determining the set pressure of the pressure regulating valve 400, the pressure loss of the pressure regulating valve 400 needs to be estimated. The pressure loss value can be determined empirically. For example, under the above operating conditions, the set pressure value of the pressure regulating valve 400 = pressure in the rod chamber of the first counterweight cylinder 100 + pressure loss. In this embodiment, the set pressure value of the pressure regulating valve 400 = detection result of the first pressure sensor 510 + pressure loss.

[0072] The control device determines that the first counterweight cylinder 100 is in a loaded falling state based on the following: the pressure oil control valve 330 is in the oil supply position 331, the first counterweight control valve 110 is in the first counterweight falling position 112, and the product of the detection result of the first pressure sensor 510 and the effective area of ​​the rod chamber of the first counterweight cylinder 100 is greater than the product of the detection result of the second pressure sensor 520 and the effective area of ​​the rodless chamber of the first counterweight cylinder 100.

[0073] During the descent of the first counterweight cylinder 100 under load, the control device adjusts the set pressure value of the pressure regulating valve 400 based on the pressure detection result of the second pressure sensor 520, corresponding to the weight of the first counterweight block, during the descent of the first counterweight cylinder 100 under load. Similarly, the pressure regulating valve 400 experiences a certain pressure loss. Under the aforementioned operating conditions, the set pressure value of the pressure regulating valve 400 = pressure in the rodless chamber of the first counterweight cylinder 100 + pressure loss. In this embodiment, the set pressure value of the pressure regulating valve 400 = detection result of the second pressure sensor 520 + pressure loss.

[0074] The weight detection process of the second counterweight and the pressure adaptation and adjustment process of the pressure regulating valve 400 during the lifting and lowering of the second counterweight cylinder 200 under load are the same as the weight detection process of the first counterweight and the pressure adaptation and adjustment process of the pressure regulating valve 400 during the lifting and lowering of the first counterweight cylinder 100 under load. In actual debugging, the first side can be measured and adjusted first, or the second side can be measured and adjusted first. Furthermore, multiple measurements and adjustments can be performed on the first and second counterweights of different weights. In subsequent operations, the control device can automatically adjust and match the working pressure of the pressure regulating valve 400 under different working conditions.

[0075] When the first counterweight cylinder 100 and the second counterweight cylinder 200 operate simultaneously, the control device selects the larger set pressure value during their independent debugging process as the set pressure value of the pressure regulating valve 400 under the current operating conditions.

[0076] For example, pressure regulating valve 400 is an electro-proportional relief valve. The control device adjusts the required pressure by controlling the magnitude of the current signal input to the electro-proportional relief valve.

[0077] In one embodiment of the present invention, the hydraulic control system further includes a swing cylinder 600 and a swing control valve 610. The swing cylinder 600 is connected to a counterweight cylinder assembly and is used to adjust the position of the counterweight cylinder assembly. The swing control valve 610 is connected to the pressure output port of the pressure oil control valve 330, the oil tank 320, and the rod-side and rodless sides of the swing cylinder 600.

[0078] The swing control valve 610 is provided with at least a swing extension position 611 and a swing retraction position 612. When the pressure oil control valve 330 is switched to the oil supply position 331 and the swing control valve 610 is switched to the swing extension position 611, the pressure oil source 310 is connected to the rodless chamber of the swing cylinder 600, and the rod chamber of the swing cylinder 600 is connected to the oil tank 320; when the pressure oil control valve 330 is switched to the oil supply position 331 and the swing control valve 610 is switched to the swing retraction position 612, the pressure oil source 310 is connected to the rod chamber of the swing cylinder 600, and the rodless chamber of the swing cylinder 600 is connected to the oil tank 320.

[0079] Furthermore, in one embodiment of the present invention, a fifth pressure sensor is installed in the rod chamber and / or rodless chamber of the swing cylinder 600. The control device is connected to the swing control valve 610 and the fifth pressure sensor, and is used to adjust the set pressure of the pressure regulating valve 400 of the swing cylinder 600 in the contracted and / or extended states under the corresponding counterweight weight based on the working state of the counterweight cylinder group, the working position of the swing control valve 610, and the detection result of the fifth pressure sensor.

[0080] For example, such as Figure 1 As shown, in this embodiment, the swing cylinder 600 includes a first swing cylinder and a second swing cylinder. The rod chamber of the first swing cylinder is connected to the rod chamber of the second swing cylinder, and the rodless chamber of the first swing cylinder is connected to the rodless chamber of the second swing cylinder. The first counterweight cylinder 100 and the second counterweight cylinder 200 are symmetrically arranged on the first and second sides of the working machine. The first swing cylinder and the second swing cylinder are also symmetrically arranged on the first and second sides of the working machine, and the piston rod of the first swing cylinder is connected to the first counterweight cylinder 100, and the piston rod of the second swing cylinder is connected to the second counterweight cylinder 200. The first swing cylinder 600 and the second swing cylinder 600 can synchronously and symmetrically adjust the positions of the first counterweight cylinder 100 and the second counterweight cylinder 200, thereby adjusting the positions of the first counterweight block and the second counterweight block. The control valve of the swing cylinder 600 is a third three-position four-way solenoid directional valve, which has a swing extension position 611, a swing retraction position 612, and a swing stop position. The two solenoid control terminals of the third-position four-way solenoid directional valve are DT5 and DT6. Controlling the energization of DT5 and DT6 switches the operating position of the valve. For example, when DT5 is energized, the valve switches to the swing extension position 611; when DT6 is energized, it switches to the swing retraction position 612. When both DT5 and DT6 are de-energized, the valve switches to the swing stop position.

[0081] The control device can adjust the set pressure of the pressure regulating valve 400 of the swing cylinder 600 in the contracted and / or extended state under the weight of the corresponding counterweight cylinder based on the working state of the counterweight cylinder group, the working position of the swing control valve 610 and the detection result of the fifth pressure sensor.

[0082] Specifically, the prerequisite for the pressure adaptation process of the pressure control valve during the operation of the telescopic cylinder is that the counterweight cylinder assembly is under load. The load status of the counterweight cylinder assembly can be determined according to the aforementioned method. For example, a fifth pressure sensor is installed in the rod chamber of the swing cylinder 600. The pressure oil source 310 supplies oil to the rod chamber of the swing cylinder 600 through the pressure oil control valve 330 and the swing control valve 610 to retract the piston rod of the swing cylinder 600. At this time, under the current load weight, during the retraction action of the swing cylinder 600, the set pressure of the pressure regulating valve 400 = the rod chamber pressure of the swing cylinder 600 + pressure loss. In this embodiment, the set pressure of the pressure regulating valve 400 = the detection result of the fifth pressure sensor + pressure loss. Under the same load weight, the set pressure of the pressure regulating valve 400 during the extension action of the swing cylinder 600 is the same as the above-mentioned set value.

[0083] In addition, the hydraulic control system is equipped with an alarm system. The alarm system is connected to the control device. For example, during the lifting process of the first counterweight cylinder 100 under load, if the difference between the pressure in the rod chamber of the first counterweight cylinder 100 and the set pressure of the corresponding pressure regulating valve 400 in the current state is not equal to the preset pressure loss value, the control device will activate the alarm system to prompt the operator to readjust or adapt the set pressure of the pressure regulating valve 400.

[0084] A second aspect of the present invention provides a method for counterweight detection and pressure adjustment based on the above-described hydraulic control system, comprising the following steps:

[0085] Switch the working state of the counterweight control valve group and the pressure oil control valve 330 so that the counterweight cylinder group falls without load.

[0086] Connect the counterweight cylinder assembly to the counterweight block, and switch the working state of the counterweight control valve assembly and the pressure oil control valve 330 so that the counterweight cylinder assembly can be lifted under load.

[0087] The control device determines the weight of the counterweight and the set pressure of the pressure regulating valve 400 in the load-bearing lifting state of the counterweight cylinder group under the corresponding counterweight weight.

[0088] Switch the working state of the counterweight control valve group and the pressure oil control valve 330 so that the counterweight cylinder group falls with the load.

[0089] The control device determines the set pressure of the pressure regulating valve 400 during the load-bearing descent of the counterweight cylinder assembly under the corresponding counterweight weight.

[0090] Furthermore, in one embodiment of the present invention, the step of the control device determining the weight of the counterweight and determining the set pressure of the pressure regulating valve 400 in the load-bearing lifting state of the counterweight cylinder assembly under the corresponding counterweight weight specifically includes:

[0091] The control device determines that the counterweight cylinder group is in a loaded lifting state based on the pressure difference between the rod chamber and the rodless chamber of the counterweight cylinder group, the working state of the counterweight control valve group and the pressure oil control valve 330, and determines the weight of the counterweight block based on the pressure difference between the rodless chamber and the rod chamber of the counterweight cylinder group and the difference in the effective area between the rodless chamber and the rod chamber of the counterweight cylinder group.

[0092] The set pressure of the pressure regulating valve 400 in the load-bearing lifting state of the counterweight cylinder assembly is determined based on the pressure difference between the rodless chamber and the rod chamber of the counterweight cylinder assembly under the corresponding counterweight weight.

[0093] The steps for the control device to determine the set pressure of the pressure regulating valve 400 during the load-bearing descent of the counterweight cylinder assembly under the corresponding counterweight weight specifically include:

[0094] The control device determines that the counterweight cylinder group is in a loaded falling state based on the pressure difference between the rod chamber and the rodless chamber of the counterweight cylinder group, the working state of the counterweight control valve group and the pressure oil control valve 330, and determines the set pressure of the pressure regulating valve 400 in the loaded falling state of the counterweight cylinder group under the corresponding counterweight weight based on the pressure difference between the rodless chamber and the rod chamber of the counterweight cylinder group.

[0095] Furthermore, the methods for counterweight weight detection and pressure adjustment also include:

[0096] The control device determines whether the counterweight cylinder assembly is under load based on the pressure difference between the rod chamber and the rodless chamber of the counterweight cylinder assembly.

[0097] The control device determines the set pressure of the pressure regulating valve 400 when the swing cylinder 600 is in the contracted and / or extended state under the corresponding counterweight weight based on the working position of the swing control valve 610 and the pressure difference between the rod chamber and the rodless chamber of the swing cylinder 600.

[0098] Specifically, for example, the first counterweight side is first debugged. During the debugging process, the pressure oil control valve 330 is switched to the oil supply position 331 and the first counterweight control valve 110 is switched to the first counterweight falling position 112. At this time, the pressure oil source 310 supplies oil to the rodless chamber of the first counterweight cylinder 100 through the pressure oil control valve 330 and the first counterweight control valve 110. The first counterweight cylinder 100 falls to the position of the first counterweight block under no load and connects with the first counterweight block.

[0099] Subsequently, the first counterweight control valve 110 is switched to the first counterweight lifting position 111. The pressure oil source 310 supplies oil to the rod chamber of the first counterweight cylinder 100 through the pressure oil control valve 330 and the first counterweight control valve 110. The first counterweight cylinder 100 drives the first counterweight block to lift upward, that is, the first counterweight cylinder 100 lifts under load.

[0100] The control device determines that the first counterweight cylinder 100 is in a loaded lifting state based on the fact that the pressure oil control valve 330 is in the oil supply position 331, the first counterweight cylinder 100 is in the first counterweight lifting position 111, and there is a pressure difference between the rod chamber and the rodless chamber of the first counterweight cylinder 100. Based on this determination, the first counterweight weight detection process is initiated. Specifically, during the loaded lifting process of the first counterweight cylinder 100, the control device determines the weight of the first counterweight block through the pressure difference between the rodless and rod chambers of the first counterweight cylinder 100 and the difference in the effective area between the rodless and rod chambers of the first counterweight cylinder 100. That is, the weight of the first counterweight block = the pressure in the rod chamber of the first counterweight cylinder 100 × the effective area of ​​the rod chamber of the first counterweight cylinder 100 - the pressure in the rodless chamber of the first counterweight cylinder 100 × the effective area of ​​the rodless chamber of the first counterweight cylinder 100.

[0101] Based on the determination that the first counterweight cylinder 100 is in a loaded lifting state and the weight of the first counterweight block, the set pressure value of the pressure regulating valve 400 is specifically adapted to the current state. Specifically, in the current state, the set value of the pressure regulating valve 400 = the pressure in the rod chamber of the first counterweight cylinder 100 + pressure loss.

[0102] When the first counterweight control valve 110 is switched to the first counterweight falling position 112, the pressure oil source 310 supplies oil to the rodless chamber of the first counterweight cylinder 100 through the pressure oil control valve 330 and the first counterweight control valve 110. The first counterweight cylinder 100 drives the first counterweight block to fall downward, that is, the first counterweight cylinder 100 falls under load.

[0103] The control device determines that the first counterweight cylinder 100 is in a loaded falling state based on the fact that the pressure oil control valve 330 is in the oil supply position 331, the first counterweight cylinder 100 is in the first counterweight falling position 112, and there is a pressure difference between the rod chamber and the rodless chamber of the first counterweight cylinder 100. Based on the determination that the first counterweight cylinder 100 is in a loaded falling state, the device initiates the set pressure adaptation process of the pressure regulating valve 400 in the current state. Specifically, in the current state, the set value of the pressure regulating valve 400 = the pressure in the rodless chamber of the first counterweight cylinder 100 + pressure loss.

[0104] Thus, the weight detection of the first counterweight block and the setting pressure adaptation of the pressure regulating valve 400 during the lifting and lowering of the first counterweight cylinder 100 under load are completed.

[0105] Then, the weight of the second counterweight block is detected in a similar manner, and the pressure setting of the pressure regulating valve 400 is adapted during the lifting and lowering of the second counterweight cylinder 200 under load.

[0106] It should be noted that in subsequent operations, if the first counterweight cylinder 100 and the second counterweight cylinder 200 operate simultaneously, the control device selects the larger set value between the first and second pressure adaptations as the pressure setting value of the pressure regulating valve 400 in that state.

[0107] Subsequently, the control device determines that the counterweight cylinder assembly is under load based on the pressure difference between the rod chamber and rodless chamber of the first counterweight cylinder 100 and / or the pressure difference between the rod chamber and rodless chamber of the second counterweight cylinder 200, and determines that the swing cylinder 600 is in a swing state based on the swing extension position 611 or the swing retraction position 612 of the swing control valve 610. When both of the above states are satisfied simultaneously, the set pressure value of the pressure regulating valve 400 is specifically adapted to the current state. Specifically, in the current state, the set value of the pressure regulating valve 400 = pressure in the rod chamber of the swing cylinder 600 / pressure in the rodless chamber of the swing cylinder 600 + pressure loss.

[0108] Thus, the commissioning of the hydraulic control system is completed. In subsequent operations, the control device can automatically detect the weight of the counterweight and automatically adjust the set pressure value of the pressure regulating valve 400 based on different operating conditions.

[0109] A third aspect of the present invention provides a working machine, including a hydraulic control system as described above or using the above-described counterweight weight detection and pressure adjustment method for weight detection and pressure adjustment.

[0110] For example, the aforementioned operating machinery includes cranes.

[0111] Furthermore, since the machine includes the hydraulic control system described above, it also possesses the advantages described above.

[0112] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hydraulic control system characterized by, The system comprises a counterweight oil cylinder group, a counterweight control valve group, a pressure oil control valve (330), a pressure regulating valve (400), a control device, a pressure oil source (310) and an oil tank (320); The pressure oil source (310) is connected with the pressure oil control valve (330), the pressure oil control valve (330) and the oil tank (320) are connected with the counterweight control valve group, the counterweight control valve group is connected with the rod cavity and the rodless cavity of the counterweight oil cylinder group, the pressure oil control valve (330) is used for controlling the communication state between the pressure oil source (310) and the counterweight control valve group, and the counterweight control valve group is used for controlling the communication state between the pressure oil control valve (330), the oil tank (320) and the rod cavity and the rodless cavity of the counterweight oil cylinder group; The pressure output oil port of the pressure oil control valve (330) is connected with the pressure regulating valve (400) between the counterweight control valve group, the control device is connected with the counterweight control valve group, the pressure oil control valve (330) and the pressure regulating valve (400), the control device is used for determining the counterweight weight based on the working state of the counterweight oil cylinder group, the pressures of the rod cavity and the rodless cavity of the counterweight oil cylinder group and the acting areas of the rod cavity and the rodless cavity of the counterweight oil cylinder group, and the control device is used for adapting and adjusting the set pressure of the pressure regulating valve (400) under the corresponding counterweight weight in different working states of the counterweight oil cylinder group.

2. The hydraulic control system of claim 1, wherein, The counterweight oil cylinder group comprises a left counterweight oil cylinder (100) and a right counterweight oil cylinder (200), and the counterweight control valve group comprises a left counterweight control valve (110) and a right counterweight control valve (210), The pressure output oil port of the pressure oil control valve (330) and the oil tank (320) are connected with the left counterweight control valve (110) and the right counterweight control valve (210), the left counterweight control valve (110) is connected with the rod cavity and the rodless cavity of the left counterweight oil cylinder (100), the left counterweight control valve (110) is used for controlling the communication state among the pressure output oil port of the pressure oil control valve (330), the oil tank (320), the rod cavity and the rodless cavity of the left counterweight oil cylinder (100), the right counterweight control valve (210) is connected with the rod cavity and the rodless cavity of the right counterweight oil cylinder (200), and the right counterweight control valve (210) is used for controlling the communication state among the pressure output oil port of the pressure oil control valve (330), the oil tank (320), the rod cavity and the rodless cavity of the right counterweight oil cylinder (200).

3. The hydraulic control system of claim 2, wherein, The pressure oil control valve (330) is provided with at least a supply oil position (331) and a relief position (332), the oil inlet of the pressure oil control valve (330) is connected with the pressure oil source (310), the oil return of the pressure oil control valve (330) is connected with the oil tank (320), in the state of the supply oil position (331), the oil inlet of the pressure oil control valve (330) is communicated with the pressure oil outlet of the pressure oil control valve (330); in the state of the relief position (332), the oil inlet of the pressure oil control valve (330) is communicated with the oil return of the pressure oil control valve (330).

4. The hydraulic control system of claim 3, wherein, The left counterweight control valve (110) is provided with at least a left counterweight lifting position (111) and a left counterweight falling position (112), in the state that the pressure oil control valve (330) is switched to the supply oil position (331) and the left counterweight control valve (110) is switched to the left counterweight lifting position (111), the pressure oil source (310) is communicated with the rod cavity of the left counterweight oil cylinder (100), the rodless cavity of the left counterweight oil cylinder (100) is communicated with the oil tank (320); in the state that the pressure oil control valve (330) is switched to the supply oil position (331) and the left counterweight control valve (110) is switched to the left counterweight falling position (112), the pressure oil source (310) is communicated with the rodless cavity of the left counterweight oil cylinder (100), the rod cavity of the left counterweight oil cylinder (100) is communicated with the oil tank (320); The right counterweight control valve (210) is provided with at least a right counterweight lifting position (211) and a right counterweight falling position (212), in the state that the pressure oil control valve (330) is switched to the supply oil position (331) and the right counterweight control valve (210) is switched to the right counterweight lifting position (211), the pressure oil source (310) is communicated with the rod cavity of the right counterweight oil cylinder (200), the rodless cavity of the right counterweight oil cylinder (200) is communicated with the oil tank (320); in the state that the pressure oil control valve (330) is switched to the supply oil position (331) and the right counterweight control valve (210) is switched to the right counterweight falling position (212), the pressure oil source (310) is communicated with the rodless cavity of the right counterweight oil cylinder (200), the rod cavity of the right counterweight oil cylinder (200) is communicated with the oil tank (320).

5. The hydraulic control system of claim 4, wherein, The rod cavity of the left counterweight oil cylinder (100) is provided with a first pressure sensor (510), the rodless cavity of the left counterweight oil cylinder (100) is provided with a second pressure sensor (520), the rod cavity of the right counterweight oil cylinder (200) is provided with a third pressure sensor (530), the rodless cavity of the right counterweight oil cylinder (200) is provided with a fourth pressure sensor (540), the control device is connected with the left counterweight control valve (110), the right counterweight control valve (210), the first pressure sensor (510), the second pressure sensor (520), the third pressure sensor (530) and the fourth pressure sensor (540), The control device is used to determine the left counterweight weight based on the working position of the left counterweight control valve (110), the detection results of the first pressure sensor (510) and the second pressure sensor (520), and the rod cavity and rodless cavity action area of the left counterweight oil cylinder (100), or determine the right counterweight weight based on the working position of the right counterweight control valve (210), the detection results of the third pressure sensor (530) and the fourth pressure sensor (540), and the rod cavity and rodless cavity action area of the right counterweight oil cylinder (200), And based on the working positions of the left counterweight control valve (110) and the pressure oil control valve (330), and the pressure adaptation and adjustment of the rod cavity and the rodless cavity of the left counterweight oil cylinder (100), the set pressure of the pressure regulating valve (400) of the left counterweight oil cylinder (100) in different action states under the corresponding left counterweight weight, or based on the working positions of the right counterweight control valve (210) and the pressure oil control valve (330), and the pressure adaptation and adjustment of the rod cavity and the rodless cavity of the right counterweight oil cylinder (200), the set pressure of the pressure regulating valve (400) of the right counterweight oil cylinder (200) in different action states under the corresponding right counterweight weight.

6. The hydraulic control system according to any one of claims 3 to 5, characterized in that, The hydraulic control system further comprises a swing oil cylinder (600) and a swing control valve (610), the swing oil cylinder (600) is connected with the counterweight oil cylinder group and is used to adjust the position of the counterweight oil cylinder group, and the swing control valve (610) is connected with the pressure output oil port of the pressure oil control valve (330), the oil tank (320), and the rod cavity and the rodless cavity of the swing oil cylinder (600), The swing control valve (610) is provided with at least a swing extension position (611) and a swing contraction position (612), in a state where the pressure oil control valve (330) is switched to the oil supply position (331) and the swing control valve (610) is switched to the swing extension position (611), the pressure oil source (310) is communicated with the rodless cavity of the swing oil cylinder (600), and the rod cavity of the swing oil cylinder (600) is communicated with the oil tank (320); in a state where the pressure oil control valve (330) is switched to the oil supply position (331) and the swing control valve (610) is switched to the swing contraction position (612), the pressure oil source (310) is communicated with the rod cavity of the swing oil cylinder (600), and the rodless cavity of the swing oil cylinder (600) is communicated with the oil tank (320).

7. The hydraulic control system of claim 6, wherein, The rod cavity and / or the rodless cavity of the swing oil cylinder (600) is provided with a fifth pressure sensor, the control device is connected with the swing control valve (610) and the fifth pressure sensor, and is used to adjust the set pressure of the pressure regulating valve (400) of the swing oil cylinder (600) in the contraction and / or extension state under the corresponding counterweight weight based on the working state of the counterweight oil cylinder group, the working position of the swing control valve (610), and the detection result of the fifth pressure sensor.

8. A method of detecting the weight of the counterweight and pressure adjustment based on the hydraulic control system according to any one of claims 1 to 7, characterized by, The method comprises the following steps: Switch the working state of the counterweight control valve group and the pressure oil control valve (330) to make the counterweight cylinder group fall under no load; Connect the counterweight cylinder group with the counterweight block, and switch the working state of the counterweight control valve group and the pressure oil control valve (330) to make the counterweight cylinder group lift under load; The control device determines the weight of the counterweight block and determines the set pressure of the pressure regulating valve (400) in the state of the counterweight cylinder group lifting under load corresponding to the weight of the counterweight block; Switch the working state of the counterweight control valve group and the pressure oil control valve (330) to make the counterweight cylinder group fall under load; The control device determines the set pressure of the pressure regulating valve (400) in the state of the counterweight cylinder group falling under load corresponding to the weight of the counterweight block.

9. The counterweight weight detection and pressure tuning method of claim 8, wherein, The step of determining the weight of the counterweight block and determining the set pressure of the pressure regulating valve (400) in the state of the counterweight cylinder group lifting under load corresponding to the weight of the counterweight block by the control device specifically includes: The control device determines that the counterweight cylinder group is in the state of lifting under load according to the pressure difference between the rod cavity and the rodless cavity of the counterweight cylinder group, the working state of the counterweight control valve group and the pressure oil control valve (330), and determines the weight of the counterweight block based on the pressure difference between the rodless cavity and the rod cavity of the counterweight cylinder group and the area difference between the rodless cavity and the rod cavity of the counterweight cylinder group; Determine the set pressure of the pressure regulating valve (400) in the state of the counterweight cylinder group lifting under load corresponding to the weight of the counterweight block based on the pressure difference between the rodless cavity and the rod cavity of the counterweight cylinder group; The step of determining the set pressure of the pressure regulating valve (400) in the state of the counterweight cylinder group falling under load corresponding to the weight of the counterweight block by the control device specifically includes: The control device determines that the counterweight cylinder group is in the state of falling under load according to the pressure difference between the rod cavity and the rodless cavity of the counterweight cylinder group, the working state of the counterweight control valve group and the pressure oil control valve (330), and determines the set pressure of the pressure regulating valve (400) in the state of the counterweight cylinder group falling under load corresponding to the weight of the counterweight block based on the pressure difference between the rodless cavity and the rod cavity of the counterweight cylinder group.

10. The counterweight weight detection and pressure tuning method of claim 9, wherein, The counterweight weight detection and pressure adjustment method further includes: The control device determines that the counterweight cylinder group is in the state of falling under load according to the pressure difference between the rod cavity and the rodless cavity of the counterweight cylinder group, the working state of the counterweight control valve group and the pressure oil control valve (330), and determines the set pressure of the pressure regulating valve (400) in the state of the counterweight cylinder group falling under load corresponding to the weight of the counterweight block based on the pressure difference between the rodless cavity and the rod cavity of the counterweight cylinder group. The control device determines that the counterweight cylinder group is in the state of falling under load according to the pressure difference between the rod cavity and the rodless cavity of the counterweight cylinder group, the working state of the counterweight control valve group and the pressure oil control valve (330), and determines the set pressure of the pressure regulating valve (400) in the state of the counterweight cylinder group falling under load corresponding to the weight of the counterweight block based on the pressure difference between the rodless cavity and the rod cavity of the counterweight cylinder group.

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