A hydraulic cylinder pressure control device, control system, and control method

Abstract

The application provides a hydraulic cylinder pressure control device, a control system and a control method. The control device comprises a pressure regulating device and a first pressure sensor. The pressure regulating device is arranged on a pipeline between an oil inlet and / or an oil outlet of an oil conveying link of a device to be regulated and an oil tank of the device to be regulated. The first pressure sensor is arranged on a pipeline between an oil inlet of the pressure regulating device and the oil conveying link. In this way, the oil supply pressure of the hydraulic cylinder in the oil conveying link can be collected by the first pressure sensor, and the oil supply pressure of the hydraulic cylinder in the oil conveying link can be regulated by the pressure regulating device arranged between the oil inlet and / or the oil outlet of the oil conveying link of the device to be regulated and the oil tank of the device to be regulated. Furthermore, the real-time regulation of the oil supply pressure of the hydraulic cylinder in the oil conveying link can be realized, the instantaneous increase of the oil supply pressure in the hydraulic cylinder can be avoided, and the situation that the drum of the engineering machinery stalls can be prevented.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydraulic control, in particular to a hydraulic cylinder pressure control device, a control system and a control method. BACKGROUND

[0002] In engineering machinery, a corresponding hydraulic cylinder is usually arranged for each working part. Taking a grab bucket of an excavator as an example, when the grab bucket performs corresponding opening or closing actions by controlling the grab bucket through an operating handle, the oil supply pressure of the grab bucket hydraulic cylinder will instantaneously increase, which causes instantaneous contraction of the pipeline in the oil supply link and accelerates damage of the pipeline in the oil supply link. In severe cases, the reel of the engineering machinery will stall, causing unnecessary property loss.

[0003] Therefore, how to adjust the oil supply pressure of the hydraulic cylinder in the oil supply link to ensure the personal safety of the operator during operation has become a problem to be solved. SUMMARY

[0004] Therefore, the purpose of the present application is to provide a hydraulic cylinder pressure control device, a control system and a control method, which can adjust the oil supply pressure of the hydraulic cylinder in the oil supply link, avoid instantaneous increase of the oil supply pressure in the hydraulic cylinder, and help prevent the reel of the engineering machinery from stalling.

[0005] The hydraulic cylinder pressure control device provided by the present application comprises a pressure adjusting device and a first pressure sensor.

[0006] The pressure adjusting device is arranged on the pipeline between the oil inlet and / or oil outlet of the oil supply link of the to-be-adjusted equipment and the oil tank of the to-be-adjusted equipment. The first pressure sensor is arranged on the pipeline between the oil inlet of the pressure adjusting device and the oil supply link.

[0007] The pressure adjusting device collects the oil supply pressure of the hydraulic cylinder through the first pressure sensor.

[0008] Further, the pressure adjusting device comprises a compensation valve and at least one pressure relief combination valve.

[0009] The compensation valve is arranged on the pipeline between the oil inlet of the pressure adjusting device and the oil drain of the pressure adjusting device. Each pressure relief combination valve is arranged on any one of the pipelines between the compensation valve and the oil drain of the pressure adjusting device.

[0010] Further, the control device further comprises a hydraulic bridge.

[0011] The hydraulic bridge is arranged on the pipeline between the oil inlet of the pressure adjusting device and the oil inlet and / or oil outlet of the oil supply link.

[0012] Further, when the oil inlet of the pressure regulating device is connected with the oil inlet path and the oil outlet path of the oil transmission link respectively, the hydraulic bridge comprises a first one-way valve and a second one-way valve;

[0013] The first one-way valve is arranged on the pipeline between the oil inlet of the pressure regulating device and the oil inlet path of the oil transmission link, and the second one-way valve is arranged on the pipeline between the oil inlet of the pressure regulating device and the oil outlet path of the oil transmission link.

[0014] Further, when the oil inlet of the pressure regulating device is connected with the oil inlet path or the oil outlet path of the oil transmission link, the hydraulic bridge comprises a third one-way valve;

[0015] The third one-way valve is arranged on the pipeline between the oil inlet of the pressure regulating device and the oil inlet path or the oil outlet path of the oil transmission link.

[0016] Further, the oil transmission link comprises a hydraulic cylinder, a hydraulic control reversing valve and a hydraulic pump;

[0017] The first output end of the hydraulic cylinder is connected with the A oil port of the hydraulic control reversing valve through a first oil path, and the second output end of the hydraulic cylinder is connected with the B oil port of the hydraulic control reversing valve through a second oil path, when the first oil path is the oil inlet path and the second oil path is the oil outlet path, or when the first oil path is the oil outlet path and the second oil path is the oil inlet path;

[0018] The P oil port of the hydraulic control reversing valve is connected with the pressure oil end of the hydraulic pump, and the T oil port of the hydraulic control reversing valve is connected with the oil tank through a connecting pipeline.

[0019] Further, the control device further comprises a shuttle valve and a second pressure sensor;

[0020] The shuttle valve is arranged between the operating handle of the device to be adjusted and the hydraulic control reversing valve;

[0021] The second pressure sensor is arranged on the shuttle valve and is used to collect the pressure value of the operating handle.

[0022] Further, the pressure relief combination valve comprises an on-off valve and a relief valve;

[0023] The on-off valve is arranged on the pipeline between the input port of the pressure relief combination valve and the output port of the pressure relief combination valve, and the relief valve is arranged on the pipeline between the on-off valve and the output port of the pressure relief combination valve.

[0024] When the on-off valve is turned on, the relief valve is turned on to reduce the oil supply pressure in the oil transmission link.

[0025] Further, the pressure relief combination valve comprises an electric proportional overflow valve.

[0026] The electric proportional overflow valve is arranged on a pipeline between an input port of the pressure relief combination valve and an output port of the pressure relief combination valve.

[0027] The electric proportional overflow valve is used to conduct in accordance with a preset opening ratio, so as to reduce the oil supply pressure in the oil supply link.

[0028] The embodiment of the present application further provides a hydraulic cylinder pressure control system, which comprises the hydraulic cylinder pressure control device, the operating handle, the oil supply link and the master control module.

[0029] When the first pressure sensor in the control device collects the pressure value of the oil supply pressure of the hydraulic cylinder and / or the second pressure sensor collects the pressure value of the pilot pressure of the operating handle, the master control module controls the corresponding pressure relief combination valve in the pressure regulating device of the control device to work.

[0030] The embodiment of the present application further provides a hydraulic cylinder pressure control method, which is applied to the control device, and the control method comprises the following steps.

[0031] When the first pressure sensor and / or the second pressure sensor in the control device detects the pressure value, a corresponding working instruction is generated.

[0032] According to the working instruction, the master control module is used to control the corresponding pressure relief combination valve in the pressure regulating device of the control device to work, so as to reduce the oil supply pressure of the hydraulic cylinder in the oil supply link.

[0033] The hydraulic cylinder pressure control device, the control system and the control method provided by the embodiment of the present application, the control device comprises a pressure regulating device and a first pressure sensor; the pressure regulating device is arranged on a pipeline between an oil inlet and / or an oil outlet of an oil supply link of a device to be regulated and an oil tank of the device to be regulated; the first pressure sensor is arranged on a pipeline between an oil inlet of the pressure regulating device and the oil supply link; and the pressure regulating device collects the oil supply pressure of the hydraulic cylinder through the first pressure sensor.

[0034] In this way, this application can collect the oil supply pressure of the hydraulic cylinder in the oil supply link through the first pressure sensor, and when the first pressure sensor collects the oil supply pressure of the hydraulic cylinder in the oil supply link, the oil supply pressure of the hydraulic cylinder in the oil supply link is adjusted by the pressure regulating device set between the oil inlet and / or oil outlet of the oil supply link of the equipment to be adjusted and the oil tank of the equipment to be adjusted. Thus, the real-time adjustment of the oil supply pressure of the hydraulic cylinder in the oil supply link can be realized, which can avoid the instantaneous increase of the oil supply pressure in the hydraulic cylinder and help prevent the reel of the construction machinery from stalling.

[0035] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0036] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 A schematic diagram of a hydraulic cylinder pressure control system provided in an embodiment of this application;

[0038] Figure 2 for Figure 1 One of the schematic diagrams of the control device shown;

[0039] Figure 3 for Figure 1 The second schematic diagram of the control device shown;

[0040] Figure 4 for Figure 1 The third schematic diagram of the control device shown;

[0041] Figure 5 for Figure 1 The fourth schematic diagram of the control device shown;

[0042] Figure 6 for Figure 1 The fifth schematic diagram of the control device shown;

[0043] Figure 7 for Figure 2 One of the structural schematic diagrams of the pressure relief combination valve shown;

[0044] Figure 8 for Figure 2 The second schematic diagram of the pressure relief combination valve shown;

[0045] Figure 9 A flow chart of a hydraulic cylinder pressure control method provided by an embodiment of the present application.

[0046] Icon: 100-control system; 110-control device; 111-pressure regulating device; 1111-compensation valve; 1112-pressure relief combination valve; 1112a-switching valve; 1112b-excess flow valve; 1112c-electric proportional excess flow valve; 112-first pressure sensor; 113-hydraulic bridge; 1131-first check valve; 1132-second check valve; 1133-third check valve; 114-shuttle valve; 115-second pressure sensor; 120-operation handle; 130-oil delivery link; 131-hydraulic cylinder; 132-hydraulic control reversing valve; 133-hydraulic pump; 140-main control module. DETAILED DESCRIPTION

[0047] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the following will be combined with the accompanying drawings for the embodiments of the present application to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments of the present application, every other embodiment obtained by a person skilled in the art without creative work falls within the scope of protection of the present application.

[0048] It should be noted that all directional indications, such as upper, lower, left, right, front, back, etc., in the present application are only used to explain the relative position relationship, movement condition, etc. between components in a certain posture (as shown in the accompanying drawings), and if the certain posture changes, the directional indications also change accordingly.

[0049] In addition, the description of "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the scope of protection claimed by the present application.

[0050] First, the applicable application scenarios of this application are introduced. This application can be applied to the field of hydraulic control technology. The control device includes a pressure regulating device and a first pressure sensor. The pressure regulating device is disposed on the pipeline between the oil inlet and / or oil outlet of the oil supply link of the device to be regulated and the oil tank of the device to be regulated. The first pressure sensor is disposed on the pipeline between the oil inlet of the pressure regulating device and the oil supply link. The first pressure sensor is used to collect the oil supply pressure of the hydraulic cylinder. When the collected oil supply pressure value is greater than a preset pressure threshold, the control device adjusts the oil supply pressure of the hydraulic cylinder.

[0051] Research has found that in construction machinery, each working part is usually equipped with a corresponding hydraulic cylinder. Taking the grab bucket of an excavator as an example, when the grab bucket is quickly controlled by the operating handle to perform the corresponding opening or closing action, the oil supply pressure of the grab bucket hydraulic cylinder will increase instantly, causing the pipeline in the oil supply link to contract instantly, accelerating the damage to the pipeline in the oil supply link. In severe cases, it will cause the reel of the construction machinery to stall, resulting in unnecessary property damage.

[0052] Please see Figure 1 , Figure 1 This is a schematic diagram of a hydraulic cylinder pressure control system provided in an embodiment of this application. Figure 1 As shown in the figure, the control system 100 provided in this application embodiment includes: a control device 110, an operating handle 120, an oil delivery link 130, and a main control module 140.

[0053] The control device 110 can collect the pressure value of the operating handle 120 and the oil supply pressure value in the oil supply link 130. At the same time, when the control device 110 collects the pressure value of the operating handle 120 and / or the oil supply pressure value in the oil supply link 130, the main control module 140 controls the control device 110 to adjust the oil supply pressure in the oil supply link 130.

[0054] The main control module 140 is set on the device to be adjusted. Specifically, it can be set in the control center of the device to be adjusted, or it can be set separately from the control center of the device to be adjusted. The specific setting method depends on the situation.

[0055] Furthermore, such as Figure 2 As shown, Figure 2 for Figure 1 One of the schematic diagrams of the control device 110 shown is illustrated. The control device 110 includes a pressure regulating device 111 and a first pressure sensor 112.

[0056] like Figure 2As shown, the pressure regulating device 111 is arranged on the pipeline between the oil inlet path or the oil outlet path of the oil supply link 130 of the device to be regulated and the oil tank of the device to be regulated, that is, there is a pipeline between the oil inlet path or the oil outlet path of the oil supply link 130 and the oil tank, and the pressure regulating device 111 is arranged in the pipeline to regulate the oil supply pressure in the oil supply link 130.

[0057] In addition, as shown in Figure 3 , Figure 3 For Figure 1 As shown in the second structural schematic diagram of the control device 110, two pressure regulating devices 111 are included in the control device 110, and each pressure regulating device 111 is arranged on the pipeline between the oil inlet path and the oil outlet path of the oil supply link 130 of the device to be regulated and the oil tank of the device to be regulated, that is, there are two pipelines between the oil inlet path or the oil outlet path of the oil supply link 130 and the oil tank, and the pressure regulating device 111 is arranged in the pipeline to regulate the oil supply pressure in the oil supply link 130.

[0058] The first pressure sensor 112 is arranged on the pipeline between the oil inlet of the pressure regulating device 111 and the oil supply link 130. The first pressure sensor 112 is used to collect the oil supply pressure of the hydraulic cylinder 131 in the oil supply link 130.

[0059] In the case where there are multiple pipelines between the oil inlet of the pressure regulating device 111 and the oil supply link 130, the first pressure sensor 112 can be arranged on any one of the pipelines.

[0060] When the first pressure sensor 112 collects the oil supply pressure of the hydraulic cylinder 131 in the oil supply link 130, it is determined that the hydraulic cylinder 131 has an extension / contraction action, and at this time, the control device 110 needs to regulate the oil supply pressure of the hydraulic cylinder 131.

[0061] Further, as shown in Figure 2 , the pressure regulating device 111 includes a compensation valve 1111 and at least one pressure relief combination valve 1112, the compensation valve 1111 is arranged on the pipeline between the oil inlet of the pressure regulating device 111 and the oil outlet of the pressure regulating device 111, and each pressure relief combination valve 1112 is arranged on any one of the pipelines between the compensation valve 1111 and the oil outlet of the pressure regulating device 111.

[0062] The oil liquid is input into the oil tank through the pipeline between the oil outlet of the pressure regulating device 111 and the oil tank (not shown in the figure).

[0063] Further, as shown in Figure 4 , Figure 4 For Figure 1Fig. 3 is a schematic view of the control device 110 according to the present application. The control device 110 further comprises a hydraulic bridge 113, which is arranged on the pipeline between the oil inlet of the pressure regulating device 111 and the oil inlet and / or outlet of the oil delivery link 130.

[0064] For the device to be regulated, the hydraulic cylinder 131 of the oil delivery link 130 of the device to be regulated is divided into a cylinder chamber and a rodless chamber, each of which corresponds to an oil path. When the oil path corresponding to the cylinder chamber is the oil inlet, the oil path corresponding to the rodless chamber is the oil outlet; conversely, when the oil path corresponding to the cylinder chamber is the oil outlet, the oil path corresponding to the rodless chamber is the oil inlet.

[0065] Specifically, the oil inlet and the oil outlet can be determined from the two oil paths according to the movement direction of the piston in the hydraulic cylinder 131.

[0066] When the oil inlet of the pressure regulating device 111 is connected to the oil inlet and the oil outlet of the oil delivery link 130, that is, there are two pipelines between the oil inlet of the pressure regulating device 111 and the oil delivery link 130, the hydraulic bridge 113 comprises a first one-way valve 1131 and a second one-way valve 1132.

[0067] When the first one-way valve 1131 is arranged on the pipeline between the oil inlet of the pressure regulating device 111 and the oil inlet of the oil delivery link 130, the second one-way valve 1132 is arranged on the pipeline between the oil inlet of the pressure regulating device 111 and the oil outlet of the oil delivery link 130.

[0068] Similarly, when the first one-way valve 1131 is arranged on the pipeline between the oil inlet of the pressure regulating device 111 and the oil outlet of the oil delivery link 130, the second one-way valve 1132 is arranged on the pipeline between the oil inlet of the pressure regulating device 111 and the oil inlet of the oil delivery link 130.

[0069] Further, as shown in Fig. 4, when the oil inlet of the pressure regulating device 111 is connected to the oil inlet or the oil outlet of the oil delivery link 130, that is, there is one pipeline between the oil inlet of the pressure regulating device 111 and the oil delivery link 130, the hydraulic bridge 113 comprises a third one-way valve 1133. Figure 5 Figure 5 The third one-way valve 1133 is arranged on the pipeline between the oil inlet of the pressure regulating device 111 and the oil inlet or the oil outlet of the oil delivery link 130. Figure 1

[0070] Further, as shown in Fig. 4, when the oil inlet of the pressure regulating device 111 is connected to the oil inlet or the oil outlet of the oil delivery link 130, that is, there is one pipeline between the oil inlet of the pressure regulating device 111 and the oil delivery link 130, the hydraulic bridge 113 comprises a third one-way valve 1133.

[0071] Further, as shown in Fig. 4, when the oil inlet of the pressure regulating device 111 is connected to the oil inlet or the oil outlet of the oil delivery link 130, that is, there is one pipeline between the oil inlet of the pressure regulating device 111 and the oil delivery link 130, the hydraulic bridge 113 comprises a third one-way valve 1133. Figure 2 ​​As shown, the oil delivery link 130 comprises a hydraulic cylinder 131, a hydraulic directional control valve 132 and a hydraulic pump 133.

[0072] The first output end of the hydraulic cylinder 131 is connected with the A oil port of the hydraulic directional control valve 132 through a first oil path, and the second output end of the hydraulic cylinder 131 is connected with the B oil port of the hydraulic directional control valve 132 through a second oil path. When the first oil path is an oil inlet path, the second oil path is an oil outlet path, and vice versa.

[0073] The P oil port of the hydraulic directional control valve 132 is connected with the pressure oil end of the hydraulic pump 133, and the T oil port of the hydraulic directional control valve 132 is connected with the oil tank through a connecting pipe.

[0074] Further, as shown in Figure 6 , Figure 6 As shown in Figure 1 , the control device 110 further comprises a shuttle valve 114 and a second pressure sensor 115.

[0075] The shuttle valve 114 is arranged between the operation handle 120 of the device to be adjusted and the hydraulic directional control valve 132.

[0076] The second pressure sensor 115 is arranged on the shuttle valve 114 and is used to collect the pressure value of the operation handle 120.

[0077] When the operation handle is a hydraulic control handle, the second pressure sensor 115 collects the pressure value of the hydraulic control handle, that is, collects the pilot pressure value of the hydraulic control handle. When the pilot pressure value of the hydraulic control handle exceeds the preset pressure threshold value, it is determined that the bucket of the device to be adjusted is performing the opening or closing action. At this time, it is determined that the hydraulic cylinder 131 has the action of stretching / contracting. At this time, it is necessary for the control device 110 to adjust the oil supply pressure of the hydraulic cylinder 131.

[0078] When the operation handle is an electric control handle, the second pressure sensor 115 collects the pressure value of the electric control handle, that is, collects the electric control signal value output by the electric control handle. When the electric control signal value output by the electric control handle exceeds the preset pressure threshold value, it is determined that the bucket of the device to be adjusted is performing the opening or closing action. At this time, it is determined that the hydraulic cylinder 131 has the action of stretching / contracting. At this time, it is necessary for the control device 110 to adjust the oil supply pressure of the hydraulic cylinder 131.

[0079] Further, as shown in Figure 7 , Figure 7 As shown in Figure 2 , the pressure relief combination valve 1112 comprises an on-off valve 1112a and an overflow valve 1112b.

[0080] The on-off valve 1112a is arranged on the pipeline between the input port of the pressure relief combination valve 1112 and the output port of the pressure relief combination valve 1112, and the overflow valve 1112b is arranged on the pipeline between the on-off valve 1112a and the output port of the pressure relief combination valve 1112.

[0081] When the on-off valve 1112a is turned on, the overflow valve 1112b is turned on, and the oil is returned to the oil tank through the on-off valve 1112a and the overflow valve 1112b in the pressure relief combination valve 1112, so as to reduce the oil supply pressure of the hydraulic cylinder 131 in the oil supply link 130.

[0082] Here, when the pressure relief combination valve 1112 includes the overflow valve 1112b, the oil supply pressure of the hydraulic cylinder in the oil supply link can be adjusted in stages, and the situation that the reel of the engineering machinery is stalled can be prevented.

[0083] Further, as shown in Figure 8 , Figure 8 for Figure 2 the second structural diagram of the pressure relief combination valve 1112. The pressure relief combination valve 1112 includes an electric proportional overflow valve 1112c.

[0084] The electric proportional overflow valve 1112c is arranged on the pipeline between the input port of the pressure relief combination valve 1112 and the output port of the pressure relief combination valve 1112.

[0085] When the electric proportional overflow valve 1112c is turned on according to the pre-set opening ratio, the oil is returned to the oil tank through the electric proportional overflow valve 1112c in the pressure relief combination valve 1112, so as to reduce the oil supply pressure of the hydraulic cylinder 131 in the oil supply link 130.

[0086] Here, when the pressure relief combination valve 1112 includes the electric proportional overflow valve 1112c, the oil supply pressure of the hydraulic cylinder in the oil supply link can be adjusted steplessly, that is, the adjustment level of the oil supply pressure in the oil supply link is not distinguished, and the situation that the reel of the engineering machinery is stalled can also be prevented.

[0087] In this way, the present application can collect the oil supply pressure of the hydraulic cylinder in the oil supply link through the first pressure sensor, and when the first pressure sensor collects the oil supply pressure of the hydraulic cylinder in the oil supply link, the oil supply pressure of the hydraulic cylinder in the oil supply link is adjusted through the pressure adjusting device arranged between the oil inlet and / or oil outlet of the oil supply link of the device to be adjusted and the oil tank of the device to be adjusted, so as to realize real-time adjustment of the oil supply pressure of the hydraulic cylinder in the oil supply link, avoid the oil supply pressure in the hydraulic cylinder from rising instantaneously, and help to prevent the situation that the reel of the engineering machinery is stalled.

[0088] Please refer to Figure 9 , Figure 9A flow chart of a hydraulic cylinder pressure control method provided by an embodiment of the present application.

[0089] S901, when the first pressure sensor and / or the second pressure sensor in the control device detects a pressure value, a corresponding working instruction is generated.

[0090] In this step, when any one of the first pressure sensor and / or the second pressure sensor provided in the control device detects a pressure value, a corresponding working instruction is generated.

[0091] Specifically, the first pressure sensor is used to collect the oil supply pressure of the hydraulic cylinder in the oil supply link. When the first pressure sensor collects the oil supply pressure of the hydraulic cylinder in the oil supply link, it is determined that the hydraulic cylinder has an extension / contraction action. At this time, the control device needs to adjust the oil supply pressure of the hydraulic cylinder.

[0092] The second pressure sensor is used to collect the pressure value of the operating handle in the device to be adjusted. When the operating handle is a hydraulic control handle, the second pressure sensor collects the pressure value of the hydraulic control handle, i.e. the pilot pressure value of the hydraulic control handle. When the pilot pressure value of the hydraulic control handle exceeds the preset pressure threshold, it is determined that the bucket of the device to be adjusted is performing an opening or closing action. At this time, it is determined that the hydraulic cylinder has an extension / contraction action. At this time, the control device needs to adjust the oil supply pressure of the hydraulic cylinder.

[0093] When the operating handle is an electric control handle, the second pressure sensor collects the pressure value of the electric control handle, i.e. the output electric control signal value of the electric control handle. When the output electric control signal value of the electric control handle exceeds the preset pressure threshold, it is determined that the bucket of the device to be adjusted is performing an opening or closing action. At this time, it is determined that the hydraulic cylinder has an extension / contraction action. At this time, the control device needs to adjust the oil supply pressure of the hydraulic cylinder.

[0094] S902, according to the working instruction, the corresponding pressure relief combination valve in the pressure regulating device of the control device is controlled to work through the main control module, so as to reduce the oil supply pressure of the hydraulic cylinder in the oil supply link.

[0095] In this step, according to the working instruction generated in step S901, the corresponding pressure relief combination valve in the pressure regulating device of the control device is controlled to work through the main control module, so as to reduce the oil supply pressure of the hydraulic pump in the oil supply link of the device to be adjusted.

[0096] Specifically, according to the working environment of the device to be adjusted, it can be determined that the pressure relief combination valve needs to be turned on when adjusting the oil supply pressure of the hydraulic pump in this environment. When it is determined that the oil supply pressure of the hydraulic pump needs to be adjusted, the corresponding pressure relief combination valve is turned on according to the adjustment strategy indicated by the working instruction, so as to adjust the oil supply pressure of the hydraulic pump.

[0097] The pressure relief combination valve can be combined by an on-off valve and an overflow valve, and can also be an electric proportional overflow valve, and the setting mode is determined according to the specific condition, and is not limited here.

[0098] The control method of the hydraulic cylinder pressure provided in the embodiments of the present application generates corresponding working instructions when the first pressure sensor and / or the second pressure sensor in the control device detects the pressure value; and according to the working instructions, the corresponding pressure relief combination valve in the pressure regulating device of the control device is controlled to work by the master control module, so as to reduce the oil supply pressure of the hydraulic cylinder in the oil supply link.

[0099] In this way, the present application can collect the oil supply pressure of the hydraulic cylinder in the oil supply link through the first pressure sensor, and when the first pressure sensor collects the oil supply pressure of the hydraulic cylinder in the oil supply link, the oil supply pressure of the hydraulic cylinder in the oil supply link is adjusted through the pressure regulating device arranged between the oil inlet and / or oil outlet of the oil supply link of the device to be adjusted and the oil tank of the device to be adjusted, and then the real-time adjustment of the oil supply pressure of the hydraulic cylinder in the oil supply link is realized, so that the instantaneous increase of the oil supply pressure in the hydraulic cylinder can be avoided, and the situation that the drum of the engineering machinery stalls can be prevented.

[0100] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the above-described device, device and unit can refer to the corresponding process in the foregoing method embodiments, which will not be repeated here.

[0101] In the several embodiments provided in the present application, it should be understood that the disclosed device, device and method can be implemented by other ways. The device embodiments described above are only schematic, for example, the division of the units is only a logical function division, and there can be another division manner in actual implementation, and some features can be combined or integrated into another device, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the shown or discussed units can be indirect coupling or communication connection through some communication interfaces, and can be electrical, mechanical or other forms.

[0102] The units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, that is, they can be located in one place, or can be distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the embodiment scheme.

[0103] In addition, each functional unit in each embodiment of the present application can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit.

[0104] If the functions are realized in the form of software function units and sold or used as independent products, they can be stored in a nonvolatile computer readable storage medium executable by a processor. Based on this understanding, the technical solutions of the present application essentially or the parts of the prior art that make contributions or parts of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a number of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the embodiments of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (Read-Only Memory, ROM), a random access memory (Random Access Memory, RAM), a magnetic disk or an optical disk, and various media that can store program codes.

[0105] Finally, it should be noted that: the above-described embodiments are merely specific embodiments of the present application, used to illustrate the technical solutions of the present application, and not to limit them. The protection scope of the present application is not limited thereto, although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand: any person skilled in the art within the technical scope disclosed by the present application can modify or easily think of changes to the technical solutions recorded in the foregoing embodiments, or make equivalent replacements to some technical features; and these modifications, changes or replacements do not make the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A hydraulic cylinder pressure control device characterized by comprising: The control device comprises a pressure regulating device and a first pressure sensor; The pressure regulating device is arranged on a pipeline between an oil inlet path and / or an oil outlet path of an oil conveying link of a device to be regulated and an oil tank of the device to be regulated; the first pressure sensor is arranged on a pipeline between an oil inlet of the pressure regulating device and the oil conveying link; The pressure regulating device collects the oil supply pressure of the hydraulic cylinder through the first pressure sensor, realizes real-time regulation of the oil supply pressure of the hydraulic cylinder in the oil conveying link, can avoid instant increase of the oil supply pressure in the hydraulic cylinder, and helps to prevent the situation that the drum of the engineering machinery stalls; The pressure regulating device comprises a compensation valve and at least one pressure relief combination valve; the compensation valve is arranged on a pipeline between the oil inlet of the pressure regulating device and a drain port of the pressure regulating device; each pressure relief combination valve is arranged on any one pipeline between the compensation valve and the drain port of the pressure regulating device; a pipeline is arranged between the drain port of the pressure regulating device and the oil tank, and oil is input into the oil tank through the pipeline between the drain port of the pressure regulating device and the oil tank; The pressure relief combination valve comprises an on-off valve and a relief valve; the on-off valve is arranged on a pipeline between an input port of the pressure relief combination valve and an output port of the pressure relief combination valve; the relief valve is arranged on a pipeline between the on-off valve and the output port of the pressure relief combination valve; when the on-off valve is turned on, the relief valve is turned on to reduce the oil supply pressure in the oil conveying link; the relief valve can realize stepwise regulation of the oil supply pressure of the hydraulic cylinder in the oil conveying link, thereby preventing the situation that the drum of the engineering machinery stalls; or, the pressure relief combination valve comprises an electric proportional relief valve arranged on a pipeline between the input port of the pressure relief combination valve and the output port of the pressure relief combination valve; the electric proportional relief valve is used to be turned on according to a preset opening ratio to reduce the oil supply pressure in the oil conveying link; The control device further comprises a hydraulic bridge arranged on a pipeline between the oil inlet of the pressure regulating device and an oil inlet path and / or an oil outlet path of the oil conveying link.

2. The control device according to claim 1, characterized by When the oil inlet of the pressure regulating device is connected to the oil inlet path and the oil outlet path of the oil conveying link respectively, the hydraulic bridge comprises a first one-way valve and a second one-way valve; The first one-way valve is arranged on a pipeline between the oil inlet of the pressure regulating device and the oil inlet path of the oil conveying link, and the second one-way valve is arranged on a pipeline between the oil inlet of the pressure regulating device and the oil outlet path of the oil conveying link.

3. The control device of claim 1, wherein When the oil inlet of the pressure regulating device is connected to the oil inlet path or the oil outlet path of the oil conveying link, the hydraulic bridge comprises a third one-way valve; The third one-way valve is arranged on a pipeline between the oil inlet of the pressure regulating device and the oil inlet path or the oil outlet path of the oil conveying link.

4. The control device of claim 1, wherein The oil conveying link comprises a hydraulic cylinder, a hydraulic control reversing valve, and a hydraulic pump; The first output end of the hydraulic cylinder is connected with the A oil port of the hydraulic control reversing valve through a first oil path, and the second output end of the hydraulic cylinder is connected with the B oil port of the hydraulic control reversing valve through a second oil path, when the first oil path is the oil inlet path and the second oil path is the oil outlet path, or when the first oil path is the oil outlet path and the second oil path is the oil inlet path; The P oil port of the hydraulic control reversing valve is connected with the pressure oil end of the hydraulic pump, and the T oil port of the hydraulic control reversing valve is connected with the oil tank through a connecting pipe.

5. The control device of claim 4, wherein The control device further comprises a shuttle valve and a second pressure sensor; The shuttle valve is arranged between the operating handle of the equipment to be adjusted and the hydraulic control reversing valve; The second pressure sensor is arranged on the shuttle valve and is used to collect the pressure value of the operating handle.

6. A system for controlling the pressure of a hydraulic cylinder, characterized by The control system comprises the hydraulic cylinder pressure control device of claim 5, an operating handle, an oil delivery link and a main control module; When the first pressure sensor in the control device collects the pressure value of the oil supply pressure of the hydraulic cylinder and / or the second pressure sensor collects the pressure value of the pilot pressure of the operating handle, the main control module controls the corresponding pressure relief combination valve in the pressure regulating device of the control device to work.

7. A method of controlling the pressure of a hydraulic cylinder, characterized by The control method is applied to the control device of claim 5, and the control method comprises: When the first pressure sensor and / or the second pressure sensor in the control device detects the pressure value, a corresponding working instruction is generated; According to the working instruction, the main control module is used to control the corresponding pressure relief combination valve in the pressure regulating device of the control device to work, so as to reduce the oil supply pressure of the hydraulic cylinder in the oil delivery link.

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