A hydraulic control system

Abstract

An embodiment of the present invention provides a hydraulic control system, which relates to the field of petroleum machinery technology. The hydraulic control system includes a controller, a variable pump and at least one switch valve, wherein the controller is electrically connected to the variable pump and the switch valve, the variable pump is connected to the switch valve, and the switch valve is used to connect to the machine tool; the controller is used to aggregate at least one flow demand into a total flow after receiving the flow demand of at least one machine tool; the controller is also used to control the output flow of the variable pump to reach the total flow, and control the opening of the switch valve corresponding to the machine tool according to the flow demand of the machine tool, so that the working flow of the machine tool is equal to the flow demand. In the embodiment of the present invention, according to the flow demand required when the machine tool is working, the working flow of the machine tool reaches the flow demand through the cooperation of the variable pressure pump and the switch valve to realize on-demand oil supply, thereby improving the accuracy of the working flow distribution.

Description

Technical Field

[0001] The present invention relates to the technical field of petroleum machinery, and in particular to a hydraulic control system. Background Art

[0002] At present, the automation level of domestic petroleum machinery is constantly improving. Automated machinery and equipment such as iron roughnecks / drill pipe power tongs, drill table manipulators / buffer manipulators, hydraulic slips, hydraulic catheads, etc. are becoming increasingly popular. The original hydraulic station of the drilling rig can no longer meet the normal use of all automated machinery and equipment. In addition, the integrated control of the drilling rig driller also puts forward new control requirements for the hydraulic station. Remote electronic control, variable flow and multi-channel composite control have become essential functions of the hydraulic station.

[0003] During the operation of petroleum machinery in the prior art, the flow demand of the machinery is not accurately controlled, resulting in poor working effect of the machinery. Summary of the invention

[0004] The purpose of the present invention is to provide a hydraulic control system, which can realize the working flow of the machine to reach the flow demand through the cooperation of a transformer pump and a switch valve according to the flow demand required when the machine is working, realize on-demand oil supply, and improve the accuracy of working flow distribution.

[0005] The embodiments of the present invention can be implemented as follows:

[0006] An embodiment of the present invention provides a hydraulic control system, the hydraulic control system comprising: a controller, a variable displacement pump and at least one switch valve, the controller is electrically connected to the variable displacement pump and the switch valve, the variable displacement pump is connected to the switch valve, and the switch valve is used to connect to a machine tool;

[0007] The controller is used to aggregate at least one flow demand into a total flow after receiving the flow demand of at least one of the tools;

[0008] The controller is also used to control the output flow of the variable pump to reach the total flow, and control the opening of the switch valve corresponding to the machine according to the flow demand of the machine, so that the working flow of the machine is equal to the flow demand.

[0009] In an optional embodiment of the present invention, the hydraulic control system also includes an oil inlet pipeline and an oil return pipeline, the switch valve includes a multi-way valve and a control valve, the multi-way valve is connected to the oil inlet pipeline and the oil return pipeline, the control valve is connected to the multi-way valve, the controller is electrically connected to the control valve, and the controller is used to control the pilot pressure of the control valve according to the flow demand, thereby controlling the opening of the multi-way valve.

[0010] In an optional embodiment of the present invention, the multi-way valve has a first body, a second body, a first valve port, a second valve port, a third valve port and a fourth valve port, the first valve port is connected to the oil inlet pipeline, the second valve port is connected to one of the machines, the third valve port is connected to another of the machines, and the fourth valve port is connected to the oil return pipeline. When the controller controls the first body to be energized, the first valve port is connected to the second valve port, and the third valve port is connected to the fourth valve port; when the controller controls the second body to be energized, the first valve port is connected to the third valve port, and the second valve port is connected to the fourth valve port.

[0011] In an optional embodiment of the present invention, the switch valve further includes a pressure stabilizing valve, and the pressure stabilizing valve is disposed on the oil inlet pipeline.

[0012] In an optional embodiment of the present invention, the switch valve further includes a relief valve, and the relief valve is arranged on the oil return pipeline.

[0013] In an optional embodiment of the present invention, the variable pump includes a pump body, a swash plate and an adjusting member, the pump body is connected to the switch valve, the swash plate is installed on the pump body, the adjusting member is connected to the swash plate, the adjusting member is electrically connected to the controller, and the adjusting member is used to drive the swash plate to rotate relative to the pump body according to the total flow rate, so that the swash plate adjusts the opening of the pump body, thereby adjusting the output flow of the pump body to reach the total flow rate.

[0014] In an optional embodiment of the present invention, the adjusting member includes a piston cylinder and a connecting valve, the connecting valve is electrically connected to the controller, the connecting valve is connected to the rodless chamber of the piston cylinder, the piston rod of the piston cylinder is connected to the swash plate, and the controller is used to control the conduction of the connecting valve according to the total flow rate, and control the flow entering the rodless chamber, thereby controlling the angle of rotation of the swash plate relative to the pump body, so as to adjust the output flow of the pump body to reach the total flow rate.

[0015] In an optional embodiment of the present invention, the connecting valve includes a third body, a first interface, a second interface and a third interface, the first interface is connected to an oil inlet device, the second interface is connected to the rodless chamber of the piston cylinder, the third interface is connected to an oil tank, the third body is electrically connected to the controller, when the controller controls the third body to be powered on, the first interface is connected to the second interface, and when the controller controls the third body to lose power, the second interface is connected to the third interface.

[0016] In an optional embodiment of the present invention, the variable displacement pump further comprises a return member connected to an end of the swash plate away from the adjusting member.

[0017] In an optional embodiment of the present invention, the hydraulic control system further includes a safety valve, and the safety valve is connected in parallel with the switch valve.

[0018] Beneficial effects of the embodiments of the present invention: the hydraulic control system includes a controller, a variable pump and at least one switch valve, the controller is electrically connected to the variable pump and the switch valve, the variable pump is connected to the switch valve, and the switch valve is used to connect to the machine; the controller is used to aggregate at least one flow demand into a total flow after receiving the flow demand of at least one machine; the controller is also used to control the output flow of the variable pump to reach the total flow, and control the opening of the switch valve connected to the corresponding machine according to the flow demand of the machine, so that the working flow of the machine is equal to the flow demand.

[0019] In the embodiment of the present invention, when a machine is started to work, the flow demand required for normal operation is sent to the controller. After receiving the flow demand, the controller aggregates the flow demand of at least one machine into a total flow, and controls the output flow of the variable pump to reach the total flow. According to the flow demand of each machine, the opening of the switch valve corresponding to the machine is controlled, so that the working flow delivered to the machine meets the flow demand, which is convenient for the machine to work. In the embodiment of the present invention, according to the flow demand required when the machine is working, the working flow of the machine reaches the flow demand through the cooperation of the variable pressure pump and the switch valve to realize on-demand oil supply, thereby improving the accuracy of the working flow distribution. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 A structural schematic diagram of the connection between a hydraulic control system and a machine tool provided in an embodiment of the present invention.

[0022] Figure 2 A block diagram of the hydraulic control system provided in an embodiment of the present invention.

[0023] Figure 3 A schematic diagram of the structure of a switch valve of a hydraulic control system provided in an embodiment of the present invention.

[0024] Figure 4 A schematic diagram of the structure of a variable displacement pump of a hydraulic control system provided in an embodiment of the present invention.

[0025] Icons: 100-hydraulic control system; 110-controller; 120-switching valve; 123-multi-way valve; 1231-first body; 1232-second body; 1233-first valve port; 1234-second valve port; 1235-third valve port; 1236-fourth valve port; 124-pressure-stabilizing valve; 126-overflow valve; 130-variable pump; 132-pump body; 134-swash plate; 136-adjusting member; 137-piston cylinder; 138-connecting valve; 1381-third body; 1382-first interface; 1383-second interface; 1384-third interface; 139-return member; 140-oil inlet pipeline; 150-oil return pipeline; 160-safety valve; 200-tools. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0029] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when used. They are only for the convenience of describing 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, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0030] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0031] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0032] Example

[0033] See also Figure 1 This embodiment provides a hydraulic control system 100. The hydraulic control system 100 provided by this embodiment can improve the accuracy of oil supply.

[0034] The hydraulic control system 100 provided in this embodiment is mainly used in petroleum machinery, and is used to connect with multiple tools 200 on the petroleum machinery to provide hydraulic power for the tools 200. Generally, there are multiple tools 200 working at the same time, and the hydraulic control system 100 needs to provide different hydraulic flows according to the actual working conditions of each tool 200.

[0035] See also Figure 1 and Figure 2 In this embodiment, the hydraulic control system 100 includes: a controller 110, a variable pump 130 and at least one switch valve 120, the controller 110 is electrically connected to the variable pump 130 and the switch valve 120, the variable pump 130 is connected to the switch valve 120, and the switch valve 120 is used to connect to the machine 200;

[0036] The controller 110 is used to aggregate the at least one flow demand into a total flow after receiving the flow demand of at least one machine 200;

[0037] The controller 110 is also used to control the output flow of the variable pump 130 to reach the total flow, and control the opening of the switch valve 120 corresponding to the machine 200 according to the flow demand of the machine 200, so that the working flow of the machine 200 is equal to the flow demand.

[0038] In this embodiment, when a machine 200 is started to work, the flow demand required for normal operation is sent to the controller 110. After receiving the flow demand, the controller 110 aggregates the flow demand of at least one machine 200 into a total flow, and controls the output flow of the variable pump 130 to reach the total flow. According to the flow demand of each machine 200, the opening of the switch valve 120 corresponding to the machine 200 is controlled, so that the working flow delivered to the machine 200 meets the flow demand, thereby facilitating the operation of the machine 200.

[0039] In this embodiment, according to the flow demand required by the machine 200 when working, the working flow of the machine 200 reaches the flow demand through the cooperation of the transformer pump and the switch valve 120 to realize on-demand oil supply, thereby improving the accuracy of working flow distribution.

[0040] When the controller 110 receives flow demands from multiple machines 200 at the same time, the sum of the multiple flow demands is the output flow of the variable pump 130, that is, the total flow. For example, when the flow demands from three machines 200 are 50L / min, 100L / min, and 150L / min respectively, the total flow is 300L / min, the output flow of the variable pump 130 is controlled to reach 300L / min, and the switch valves 120 corresponding to the three machines 200 are controlled to open to the corresponding openings, so that the openings reach 50L / min, 100L / min, and 150L / min respectively.

[0041] In this embodiment, the hydraulic control system 100 also includes an oil inlet pipeline 140 and an oil return pipeline 150, the switch valve 120 includes a multi-way valve 123 and a control valve, the multi-way valve 123 is connected to the oil inlet pipeline 140 and the oil return pipeline 150, the control valve is connected to the multi-way valve 123, and the controller 110 is electrically connected to the control valve. The controller 110 is used to control the pilot pressure of the control valve according to the flow demand, thereby controlling the opening of the multi-way valve 123.

[0042] In this embodiment, by controlling the pilot pressure of the control valve and the opening of the multi-way valve 123, the working flow from the multi-way valve 123 to the tool 200 can meet the flow demand of the tool 200. For example, when the flow demand of the tool 200 is 50 L / min, the controller 110 controls the pilot pressure of the control valve to be 50 L / min, so that the flow through the multi-way valve 123 is 50 L / min, so as to provide the tool 200 with work.

[0043] In this embodiment, the control valve may be a pressure reducing valve, and the working flow of the machine 200 is controlled by controlling the outlet pressure of the pressure reducing valve.

[0044] See also Figure 3 In the present embodiment, the multi-way valve 123 has a first body 1231, a second body 1232, a first valve port 1233, a second valve port 1234, a third valve port 1235 and a fourth valve port 1236. The first valve port 1233 is connected to the oil inlet pipeline 140, the second valve port 1234 is connected to one machine 200, the third valve port 1235 is connected to another machine 200, and the fourth valve port 1236 is connected to the oil return pipeline 150. When the controller 110 controls the first body 1231 to be energized, the first valve port 1233 is connected to the second valve port 1234, and the third valve port 1235 is connected to the fourth valve port 1236; when the controller 110 controls the second body 1232 to be energized, the first valve port 1233 is connected to the third valve port 1235, and the second valve port 1234 is connected to the fourth valve port 1236.

[0045] In this embodiment, one multi-way valve 123 can be connected to multiple tools 200. When receiving the flow demand of the tool 200 connected to the second valve port 1234, the controller 110 controls the first body 1231 to be powered. When receiving the flow demand of the tool 200 connected to the second valve port 1234, the controller 110 controls the second body 1232 to be powered.

[0046] In this embodiment, the switch valve 120 further includes a pressure stabilizing valve 124, which is disposed on the oil inlet pipeline 140. The pressure stabilizing valve 124 disposed on the oil inlet pipeline 140 can stabilize the oil pressure entering the switch valve 120 to prevent the switch valve 120 from being damaged by excessive oil pressure. The pressure stabilizing valve 124 can be a pressure reducing valve.

[0047] In this embodiment, the switch valve 120 further includes a relief valve 126, which is disposed on the oil return line 150. The relief valve 126 is disposed on the oil return line 150 to prevent the hydraulic oil from flowing back when the machine 200 is not working, thereby affecting the working effect.

[0048] See also Figure 4 In this embodiment, the variable pump 130 includes a pump body 132, a swash plate 134 and an adjusting member 136. The pump body 132 is connected to the switch valve 120, the swash plate 134 is installed on the pump body 132, the adjusting member 136 is connected to the swash plate 134, and the adjusting member 136 is electrically connected to the controller 110. The adjusting member 136 is used to drive the swash plate 134 to rotate relative to the pump body 132 according to the total flow rate, so that the swash plate 134 adjusts the opening of the pump body 132, thereby adjusting the output flow of the pump body 132 to reach the total flow rate.

[0049] In this embodiment, after the controller 110 aggregates at least one flow demand into a total flow, it controls the driving force of the adjustment member 136, thereby controlling the inclination angle of the swash plate 134 and adjusting the opening of the pump body 132 so that the output flow is equal to the total flow.

[0050] In this embodiment, the adjusting member 136 includes a piston cylinder 137 and a connecting valve 138. The connecting valve 138 is electrically connected to the controller 110. The connecting valve 138 is connected to the rodless chamber of the piston cylinder 137. The piston rod of the piston cylinder 137 is connected to the swash plate 134. The controller 110 is used to control the conduction of the connecting valve 138 according to the total flow rate, and control the flow entering the rodless chamber, thereby controlling the angle of rotation of the swash plate 134 relative to the pump body 132, so as to adjust the output flow of the pump body 132 to reach the total flow rate.

[0051] In this embodiment, the piston rod of the piston cylinder 137 is connected to the swash plate 134, and the inclination angle of the swash plate 134 is controlled by the extension and retraction of the piston rod, thereby adjusting the opening 1123a of the pump body 132 to adjust the output flow of the pump body 132 so that the output flow reaches the total flow.

[0052] In this embodiment, after the controller 110 summarizes at least one received flow demand into a total flow, it controls the connecting valve 138 to open, allowing the hydraulic oil to enter the rodless chamber, causing the rodless chamber to gradually increase in size and the rod chamber to gradually decrease in size. The piston rod pushes the swash plate 134 to move, thereby adjusting the size of the opening 1123a of the pump body 132.

[0053] In this embodiment, the connecting valve 138 includes a third body 1381, a first interface 1382, a second interface 1383 and a third interface 1384. The first interface 1382 is connected to an oil inlet device, the second interface 1383 is connected to the rodless chamber of the piston cylinder 137, and the third interface 1384 is connected to an oil tank. The third body 1381 is electrically connected to the controller 110. When the controller 110 controls the third body 1381 to be powered on, the first interface 1382 is connected to the second interface 1383. When the controller 110 controls the third body 1381 to lose power, the second interface 1383 is connected to the third interface 1384.

[0054] When the controller 110 starts the pump body 132, the third body 1381 is controlled to be energized, the first interface 1382 is connected with the second interface 1383, and the hydraulic oil enters the rodless cavity to push the piston rod to move.

[0055] In this embodiment, the variable pump 130 further includes a return member 139, which is connected to an end of the swash plate 134 away from the adjusting member 136. When the third body 1381 loses power, the swash plate 134 rotates in the opposite direction under the action of the return force of the return member 139, so that the rod chamber gradually becomes larger and the rodless chamber gradually becomes smaller, and the hydraulic oil in the rodless chamber returns to the oil inlet device.

[0056] In this embodiment, the hydraulic control system 100 further includes a safety valve 160, which is connected in parallel with the switch valve 120. One end of the safety valve 160 is connected to the oil inlet pipeline 140, and the other end is connected to the oil return pipeline 150. When each machine 200 has no flow demand but the variable pump 130 is started, the output flow of the variable pump 130 can be unloaded through the safety valve 160, thereby ensuring the safety performance of the entire hydraulic control system 100.

[0057] To summarize, the hydraulic control system 100 provided in this embodiment, in this embodiment, according to the flow demand required by the machine 200 when working, the working flow of the machine 200 reaches the flow demand through the cooperation of the transformer pump and the switch valve 120 to realize on-demand oil supply, thereby improving the accuracy of working flow distribution.

[0058] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A hydraulic control system, characterized in that: The hydraulic control system (100) comprises: a controller (110), a variable displacement pump (130) and at least one switch valve (120); the controller (110) is electrically connected to the variable displacement pump (130) and the switch valve (120); the variable displacement pump (130) is connected to the switch valve (120); and the switch valve (120) is used to be connected to a machine tool (200); The controller (110) is used to aggregate at least one flow demand into a total flow after receiving the flow demand of at least one tool (200); The controller (110) is further used to control the output flow of the variable pump (130) to reach the total flow, and to control the opening of the switch valve (120) corresponding to the machine (200) according to the flow demand of the machine (200), so that the working flow of the machine (200) is equal to the flow demand; The hydraulic control system (100) further comprises an oil inlet pipeline (140) and an oil return pipeline (150); the switch valve (120) comprises a multi-way valve (123) and a control valve; the multi-way valve (123) is in communication with the oil inlet pipeline (140) and the oil return pipeline (150); the control valve is connected to the multi-way valve (123); the controller (110) is electrically connected to the control valve; the controller (110) is used to control the pilot pressure of the control valve according to the flow demand, thereby controlling the opening of the multi-way valve (123); The multi-way valve (123) comprises a first body (1231), a second body (1232), a first valve port (1233), a second valve port (1234), a third valve port (1235) and a fourth valve port (1236); the first valve port (1233) is connected to the oil inlet pipeline (140), the second valve port (1234) is connected to one of the tools (200), the third valve port (1235) is connected to another of the tools (200), and the fourth valve port (1236) is connected to the oil return pipeline (140). 50), when the controller (110) controls the first body (1231) to be powered, the first valve port (1233) is connected to the second valve port (1234), and the third valve port (1235) is connected to the fourth valve port (1236); when the controller (110) controls the second body (1232) to be powered, the first valve port (1233) is connected to the third valve port (1235), and the second valve port (1234) is connected to the fourth valve port (1236); The variable displacement pump (130) comprises a pump body (132), a swash plate (134) and an adjusting member (136); the pump body (132) is connected to the switch valve (120); the swash plate (134) is mounted on the pump body (132); the adjusting member (136) is connected to the swash plate (134); the adjusting member (136) is electrically connected to the controller (110); the adjusting member (136) is used to drive the swash plate (134) to rotate relative to the pump body (132) according to the total flow rate, so that the swash plate (134) adjusts the opening of the pump body (132), thereby adjusting the output flow rate of the pump body (132) to reach the total flow rate.

2. The hydraulic control system according to claim 1, characterized in that: The switch valve (120) further comprises a pressure stabilizing valve (124), and the pressure stabilizing valve (124) is arranged on the oil inlet pipeline (140).

3. The hydraulic control system according to claim 1, characterized in that: The switch valve (120) further comprises a relief valve (126), wherein the relief valve (126) is arranged on the oil return pipeline (150).

4. The hydraulic control system according to claim 1, characterized in that: The regulating member (136) comprises a piston cylinder (137) and a connecting valve (138), wherein the connecting valve (138) is electrically connected to the controller (110), and the connecting valve (138) is connected to the rodless chamber of the piston cylinder (137), and the piston rod of the piston cylinder (137) is connected to the swash plate (134). The controller (110) is used to control the conduction of the connecting valve (138) according to the total flow rate, and to control the flow rate entering the rodless chamber, thereby controlling the angle of rotation of the swash plate (134) relative to the pump body (132), so as to adjust the output flow rate of the pump body (132) to reach the total flow rate.

5. The hydraulic control system according to claim 4, characterized in that: The connecting valve (138) comprises a third body (1381), a first interface (1382), a second interface (1383) and a third interface (1384); the first interface (1382) is connected to an oil inlet device; the second interface (1383) is connected to the rodless chamber of the piston cylinder (137); the third interface (1384) is connected to an oil tank; the third body (1381) is electrically connected to the controller (110); when the controller (110) controls the third body (1381) to be powered on, the first interface (1382) is connected to the second interface (1383); when the controller (110) controls the third body (1381) to be powered off, the second interface (1383) is connected to the third interface (1384).

6. The hydraulic control system according to claim 1, characterized in that: The variable displacement pump (130) further comprises a return member (139), wherein the return member (139) is connected to an end of the swash plate (134) away from the adjustment member (136).

7. The hydraulic control system according to claim 1, characterized in that: The hydraulic control system (100) further comprises a safety valve (160), wherein the safety valve (160) is connected in parallel with the switch valve (120).

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