Emergency hydraulic control device of hydraulic winch

Abstract

The utility model provides an emergency hydraulic control device for a hydraulic winch, which relates to the technical field of hydraulic winches and comprises an oil pump, an oil pump variable cylinder, an electric proportional valve, a manual pressure reducing valve and an electromagnetic directional valve. A control oil port of the oil pump variable cylinder is connected to an oil outlet of the electric proportional valve through an internal oil duct; an oil outlet of the manual pressure reducing valve is connected to control ports in the two ends of a valve element of the electric proportional valve, an electromagnetic directional valve is arranged on an oil inlet loop of the manual pressure reducing valve, and when the hydraulic control emergency control mode is used for operation, the electromagnetic directional valve switches pressure oil to a pressure oil port of the manual pressure reducing valve; pressure oil output by the manual pressure reducing valve drives a valve element of the electric proportional valve to move, the rotating speed and the direction of the hydraulic winch can be changed along with changes of the output pressure of the manual pressure reducing valve, the performance of the hydraulic winch is consistent with that of an electric proportional control mode, and when the electric control mode fails, the hydraulic winch can still run stably, rapidly, accurately and reliably through the device.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic winch technology, and more specifically, to an emergency hydraulic control device for hydraulic winches. Background Technology

[0002] Electro-proportional control hydraulic winches are widely used in logging hydraulic winches, well testing hydraulic winches, towing skids, and coiled tubing trucks (skids) due to their inherent advantages. However, because the petroleum industry has stringent reliability requirements, purely electro-proportional control hydraulic winches rely on PWM signals to control an electro-proportional valve. This valve, in turn, controls the variable cylinder of the oil pump, causing the pump to output hydraulic oil to control the winch's operation. While this electro-proportional control method has many advantages, its complex electrical control structure makes it prone to failure, making it difficult to meet the reliability requirements of some critical applications.

[0003] The solution to this problem is to add an emergency hydraulic control device to the existing electro-proportional control system, such as... Figure 1 The diagram shows the principle of the emergency hydraulic control device for the winch. When the electro-proportional control system fails, it uses a manual pressure reducing valve and a switching valve group to jointly determine the supply of control oil to the oil pump variable cylinder, which drives the oil pump variable cylinder to operate, thereby causing the oil pump to output hydraulic oil to drive the hydraulic winch to operate, thus effectively avoiding the serious consequences that may be caused by the failure of the electro-proportional control system.

[0004] However, this emergency hydraulic control device has the problem of complex oil circuits. Furthermore, due to the limitations of the oil pump's structural principle, the oil pump cannot operate at its maximum displacement in emergency hydraulic control mode, unlike the electronic control mode. As a result, the hydraulic winch operates at a slower speed, making it difficult to quickly, accurately, and effectively control the operating conditions of the hydraulic winch. Utility Model Content

[0005] The purpose of this utility model is to address the problems in the prior art by providing an emergency hydraulic control device for hydraulic winches, which can realize the function of electro-proportional control of hydraulic winches in emergency situations.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] This utility model provides an emergency hydraulic control device for a hydraulic winch, including an oil pump, an oil pump variable cylinder, an electro-proportional valve, a manual pressure reducing valve, and a solenoid directional valve:

[0008] The oil pump is located on the oil supply line of the hydraulic winch. The oil pump variable cylinder is used to adjust the oil output flow and direction of the oil pump to control the hydraulic winch. The control oil port of the oil pump variable cylinder is connected to the oil outlet of the electro-proportional valve through an internal oil passage.

[0009] The oil outlet of the manual pressure reducing valve is connected to the control ports at both ends of the valve core of the electro-proportional valve, and an electromagnetic directional valve is installed on the oil inlet circuit of the manual pressure reducing valve.

[0010] Optionally, the forward-side outlet of the manual pressure reducing valve is connected to the forward-side valve core control port of the electro-proportional valve, and the reverse-side outlet is connected to the reverse-side valve core control port of the electro-proportional valve, so as to drive the hydraulic winch to operate in the forward and reverse directions respectively through the handle of the manual pressure reducing valve.

[0011] Optionally, the pushing angle of the handle is positively correlated with the rotational speed of the hydraulic winch.

[0012] Optionally, when the handle is in the middle position, the valve core of the electro-proportional valve returns to the middle position, and the hydraulic winch stops operating.

[0013] Optionally, the solenoid directional valve is a two-position three-way directional valve, which includes an initial position and a hydraulic control position. When the two-position three-way directional valve is energized, it is in the initial position and the pressure oil is not connected. When the two-position three-way directional valve is de-energized, it is in the hydraulic control position and the pressure oil is connected to the manual pressure reducing valve.

[0014] The hydraulic winch emergency hydraulic control device provided by this utility model has the following beneficial effects:

[0015] 1) When the hydraulic winch of this utility model is running in the hydraulic emergency control mode, the operator can directly adjust the valve core of the electro-proportional valve through the manual pressure reducing valve to conveniently and quickly control the action of the oil pump variable cylinder, thereby realizing the operation control of the hydraulic winch. This device can make the speed of the hydraulic winch change with the output pressure of the manual pressure reducing valve, and the speed of the hydraulic winch changes smoothly. It can timely and effectively control the operating conditions of the hydraulic winch, realize all the functions of the electro-proportional control mode, and make the hydraulic winch run at full speed.

[0016] 2) The manual pressure reducing valve directly drives the electro-proportional valve spool, eliminating the complex hydraulic control circuits and intermediate conversion links found in traditional emergency hydraulic control devices, making control signal transmission more direct and efficient. By manually adjusting the angle of the pressure reducing valve handle, the displacement of the electro-proportional valve spool can be linearly controlled, thereby precisely adjusting the action of the oil pump variable cylinder and achieving continuous and stable control of the hydraulic winch's speed and direction of operation. A relatively small control oil pressure (from the manual pressure reducing valve) can push the electro-proportional valve spool to produce a large displacement, thereby controlling the flow rate and direction of the main oil circuit to the oil pump variable cylinder. This not only improves the system's response speed and control accuracy but also reduces the risk of control failure due to intermediate link failures, ensuring that the hydraulic winch can still operate stably and reliably in the event of an electro-proportional control system failure, effectively improving the emergency reliability and ease of operation of the entire system. Attached Figure Description

[0017] 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.

[0018] Figure 1 This is an emergency hydraulic control device based on existing technology;

[0019] Figure 2 This is a schematic diagram of the principle of an emergency hydraulic control device for a hydraulic winch provided in an embodiment of this application.

[0020] Icons: 1. Oil pump; 2. Oil pump variable cylinder; 3. Electro-proportional valve; 4. Manual pressure reducing valve; 5. Solenoid directional valve; 6. Hydraulic winch. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of this application. It should be noted that, without conflict, the various features in the embodiments of this application can be combined with each other, and the combined embodiments are still within the protection scope of this application.

[0022] The emergency hydraulic control device for hydraulic winches is an emergency system used on oilfield hydraulic winches. It can also be applied to electro-proportional control trolley hydraulic winches, coiled tubing trolleys (skids), and other applications using electro-hydraulic proportional control. Due to the stringent reliability requirements of the petroleum industry, purely electro-proportional control hydraulic winches use PWM signals to control an electro-proportional valve. This valve then controls the variable cylinder of the oil pump, causing the pump to output hydraulic oil to control the winch's operation. While this electro-proportional control method has many advantages, its complex electrical control structure makes it prone to failure, making it difficult to meet the reliability requirements of some critical applications.

[0023] Currently, the domestic and international solutions to this problem involve adding an emergency hydraulic control device to the existing electro-proportional control system. This emergency hydraulic control device allows the hydraulic winch to operate when the electro-proportional control system malfunctions, thus avoiding serious consequences caused by the failure of the electro-proportional control system. For example... Figure 1As shown, when the electro-proportional control system malfunctions, it uses a manual pressure reducing valve and a switching valve group to jointly determine the supply of control oil to the variable cylinder of the oil pump, thereby actuating the variable cylinder and causing the oil pump to output hydraulic oil to drive the hydraulic winch. This effectively avoids the serious consequences that may be caused by the malfunction of the electro-proportional control system. However, this emergency hydraulic control device has also revealed many problems in use, such as a complex oil circuit, the hydraulic winch being limited by the structure and principle of the oil pump to operate at full speed, and a very slow hydraulic winch speed. The fastest speed of the hydraulic winch is only about 1 / 3 of that in the electro-proportional control mode. When switching to emergency hydraulic control mode, the working time is more than three times that of the electro-proportional control mode. The operating speed of the hydraulic winch is also affected by changes in the hydraulic winch load and oil temperature, causing fluctuations in the hydraulic winch speed.

[0024] To address the aforementioned problems, this application provides an emergency hydraulic control device for a hydraulic winch. When the electro-proportional control circuit malfunctions and cannot operate, it switches to emergency hydraulic control mode. The hydraulic oil output from the manual pressure reducing valve 4 directly drives the valve core of the electro-proportional valve 3. The output control oil from this valve drives the variable cylinder 2 of the oil pump, causing the hydraulic pump 1 to output hydraulic oil to drive the hydraulic winch 6, thus preventing accidents. The emergency hydraulic control device provided in this application provides performance consistent with the electro-proportional control method, enabling the hydraulic winch 6 to operate at full speed.

[0025] like Figure 2 As shown in the embodiment of this application, an emergency hydraulic control device for a hydraulic winch includes an oil pump 1, an oil pump variable cylinder 2, an electro-proportional valve 3, a manual pressure reducing valve 4, and a solenoid directional valve 5. The oil pump 1 is located on the oil supply line of the hydraulic winch 6. The oil pump variable cylinder 2 is built into the oil pump 1 and is used to adjust the oil output flow rate and direction of the oil pump 1 to control the speed and direction of the hydraulic winch 6. The control port of the oil pump variable cylinder 2 is connected to the outlet of the electro-proportional valve 3 through an internal oil passage. The outlet of the manual pressure reducing valve 4 is connected to the control ports at both ends of the valve core of the electro-proportional valve 3. A solenoid directional valve 5 is provided on the oil inlet circuit of the manual pressure reducing valve 4. In the emergency hydraulic control mode, pressurized oil enters the manual pressure reducing valve 4 through the solenoid directional valve 5. The electromagnetic directional valve 5 adopts the logic of "power-off connection" (when power is off, it is in the hydraulic control position, connecting the pressure oil to the manual pressure reducing valve 4). When the electro-proportional control system is running normally, the valve is in the initial position (no pressure oil is connected), the emergency hydraulic control circuit is isolated, and it does not affect the operation of the main electro-control system. When the electro-proportional control system fails and is powered off, the electromagnetic directional valve 5 automatically switches to the hydraulic control position and immediately activates the emergency manual control mode. The electromagnetic directional valve 5 switches the pressure oil to the pressure oil port of the manual pressure reducing valve 4. By operating the control handle of the manual pressure reducing valve 4, the pressure oil output by the manual pressure reducing valve 4 drives the valve core of the electro-proportional valve 3 to move. The pressure oil output by the electro-proportional valve 3 drives the oil pump variable cylinder 2 to move. Under the action of the oil pump variable cylinder 2, the oil pump 1 outputs the corresponding oil flow to drive the hydraulic winch 6 to work.

[0026] The forward outlet of the manual pressure reducing valve 4 is connected to the forward valve core control port of the electro-proportional valve 3, and the reverse outlet is connected to the reverse valve core control port of the electro-proportional valve 3, so that the hydraulic winch 6 can be driven to operate in the forward and reverse directions respectively by the handle of the manual pressure reducing valve 4. The pushing angle of the handle is positively correlated with the rotational speed of the hydraulic winch 6. When the handle is in the middle position, the valve core of the electro-proportional valve 3 is reset to the middle position, and the hydraulic winch 6 stops operating. The solenoid directional valve 5 is a two-position three-way directional valve, which includes an initial position and a hydraulic control position. When the two-position three-way directional valve is energized, it is in the initial position, and the pressure oil is not flowing. When the two-position three-way directional valve is de-energized, it is in the hydraulic control position, and the pressure oil is connected to the manual pressure reducing valve 4.

[0027] The operating principle and method of this utility model are as follows: During normal operation, the hydraulic winch operates in an electro-proportional control mode. Under normal circumstances, the electro-proportional control circuit functions normally. The controller outputs a PWM signal, which is sent to the control signal input terminal of the electro-proportional valve 3. Based on the PWM signal, the electro-proportional valve 3 outputs control oil with corresponding pressure and flow rate through its outlet to the control oil port of the variable cylinder 2 of the oil pump. Upon receiving the control oil, the variable cylinder 2 adjusts the displacement of the oil pump 1. The oil pump 1 then outputs hydraulic oil with appropriate pressure and flow rate, driving the hydraulic winch 6 to operate normally, enabling operations such as rope winding and unwinding, and meeting the requirements of various working conditions in oilfield operations.

[0028] When the electro-proportional circuit malfunctions and the electro-proportional valve 3 fails to operate, the hydraulic winch 6 stops working. Due to the harsh operating environment, the equipment carried by the hydraulic winch 6 cannot remain in such conditions for an extended period and needs to be towed to a safe location as soon as possible. At this point, the hydraulic winch 6 needs to be switched from electronic control mode to hydraulic emergency control mode. In this state, the solenoid directional valve 5 is de-energized, and pressurized oil flows through it to the manual pressure reducing valve 4. The outlet of the manual pressure reducing valve 4 is connected to the control port of the electro-proportional valve 3. The operator can manually operate the handle of the manual pressure reducing valve 4; the angle of the handle's push is positively correlated with the rotational speed of the hydraulic winch 6. When the handle is pushed forward, the forward outlet of the manual pressure reducing valve 4 outputs hydraulic oil. This hydraulic oil acts on the forward valve core control port of the electro-proportional valve 3, driving the valve core of the electro-proportional valve 3 to actuate. This causes the electro-proportional valve 3 to output control oil, which in turn drives the variable cylinder 2 of the oil pump, thereby causing the hydraulic pump 1 to output hydraulic oil to drive the hydraulic winch 6 in the forward direction. Similarly, when the handle is pulled back, the hydraulic oil is output from the retracting outlet of the manual pressure reducing valve 4, which acts on the retracting valve core control port of the electro-proportional valve 3, driving the valve core of the electro-proportional valve 3 to move in the reverse direction, causing the hydraulic winch 6 to run in the reverse direction. When the handle is in the middle position, the valve core of the electro-proportional valve 3 returns to the middle position. At this time, the oil pump variable cylinder 2 is no longer under the action of control oil, and the hydraulic winch 6 stops running, achieving more efficient emergency control.

[0029] This utility model has the following advantages:

[0030] 1) In the hydraulic emergency mode, the device can make the speed of the hydraulic winch 6 change with the output pressure of the manual pressure reducing valve 4. The speed of the hydraulic winch 6 changes smoothly, which is consistent with the performance of the electro-proportional control mode. It can realize all the functions of the electro-proportional control mode, ensuring that the hydraulic winch 6 can still make precise speed adjustments according to the operation requirements in emergency situations, and fully exert all the functions of the electro-proportional control, providing a strong guarantee for the continuity and safety of the operation.

[0031] 2) In emergency hydraulic control mode, the manual pressure reducing valve directly drives the electro-proportional valve spool, eliminating the complex hydraulic control circuits and intermediate conversion links found in traditional emergency hydraulic control devices, making control signal transmission more direct and efficient. By manually adjusting the angle of the pressure reducing valve handle, the displacement of the electro-proportional valve spool can be linearly controlled, thereby precisely adjusting the action of the oil pump variable cylinder to achieve continuous and stable control of the hydraulic winch's speed and direction of operation. This control method allows the oil pump to operate at maximum displacement, and the hydraulic winch 6 can run at full speed. In emergency situations, the hydraulic winch 6 can complete equipment towing or other critical tasks in a shorter time, greatly improving the efficiency of emergency response.

[0032] 3) When operating in emergency hydraulic control mode, the hydraulic oil output by the manual pressure reducing valve 4 drives the valve core of the electro-proportional valve 3, which controls the oil pump variable cylinder 2. The electro-proportional valve 3 and the oil pump variable cylinder 2 form a closed-loop control circuit, which can effectively correct the influence of oil temperature changes and load changes on the speed of the hydraulic winch 6. The speed of the hydraulic winch 6 is not affected by oil temperature changes and load changes, which effectively improves the stability and reliability of the operation.

[0033] 4) This device only requires one manual pressure reducing valve 4 to complete emergency hydraulic control. The forward rotation, reverse rotation, stop and speed adjustment of the hydraulic winch 6 can be realized by the handle of one manual pressure reducing valve 4. This not only simplifies the oil circuit system, reduces system complexity and failure risk, but also facilitates daily maintenance and management, saving valuable operating time and maintenance costs.

[0034] In summary, the emergency hydraulic control device for the hydraulic winch provided in this application uses hydraulic oil output from the manual pressure reducing valve 4 to directly control the valve core of the electro-proportional valve 3 of the oil pump 1. When the circuit of the electro-proportional valve 3 malfunctions and the electro-proportional valve 3 cannot operate, the hydraulic oil output from the manual pressure reducing valve 4 drives the electro-proportional valve 3 to operate, controlling the oil pump variable cylinder 2, allowing the hydraulic pump 1 to output hydraulic oil to drive the hydraulic winch 6. This emergency hydraulic control device can effectively drive the hydraulic winch 6 to operate using the manual pressure reducing valve 4 hydraulic control method when the electro-proportional control system fails, avoiding production stoppages or safety accidents caused by electrical control failures. Moreover, its performance in controlling the hydraulic winch 6 is consistent with that of the electro-proportional control method, enabling the hydraulic winch 6 to operate at full speed, which is a significant performance improvement compared to traditional emergency hydraulic control devices.

[0035] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An emergency hydraulic control device for a hydraulic winch, characterized in that, Includes an oil pump (1), an oil pump variable cylinder (2), an electro-proportional valve (3), a manual pressure reducing valve (4), and a solenoid directional valve (5): The oil pump (1) is located on the oil supply line of the hydraulic winch (6). The oil pump variable cylinder (2) is used to adjust the oil output flow and direction of the oil pump (1) to control the hydraulic winch (6). The control oil port of the oil pump variable cylinder (2) is connected to the oil outlet of the electro-proportional valve (3) through an internal oil passage. The oil outlet of the manual pressure reducing valve (4) is connected to the control ports at both ends of the valve core of the electro-proportional valve (3), and the electromagnetic reversing valve (5) is provided on the oil inlet circuit of the manual pressure reducing valve (4).

2. The hydraulic winch emergency hydraulic control device according to claim 1, characterized in that, The forward-side oil outlet of the manual pressure reducing valve (4) is connected to the forward-side valve core control port of the electro-proportional valve (3), and the reverse-side oil outlet is connected to the reverse-side valve core control port of the electro-proportional valve (3), so as to drive the hydraulic winch (6) to run in the forward and reverse directions respectively through the handle of the manual pressure reducing valve (4).

3. The hydraulic winch emergency hydraulic control device according to claim 2, characterized in that, The pushing angle of the handle is positively correlated with the rotational speed of the hydraulic winch (6).

4. The hydraulic winch emergency hydraulic control device according to claim 2, characterized in that, When the handle is in the middle position, the valve core of the electro-proportional valve (3) is reset to the middle position, and the hydraulic winch (6) stops operating.

5. The hydraulic winch emergency hydraulic control device according to claim 1, characterized in that, The electromagnetic directional valve (5) is a two-position three-way directional valve. The two-position three-way directional valve includes an initial position and a hydraulic control position. When the two-position three-way directional valve is energized, it is in the initial position and the pressure oil is not connected. When the two-position three-way directional valve is de-energized, it is in the hydraulic control position and the pressure oil is connected to the manual pressure reducing valve (4).

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