Control valve block for hydraulic control type automatic turning gear

Abstract

The invention discloses a control valve block for a hydraulic control type automatic turning gear, and belongs to the technical field of hydraulic control type automatic turning gears. In order to solve the problems that an existing hydraulic control type automatic barring gear control valve block is not high in hydraulic motor rotating speed control precision, low in barring control oil pressure and incapable of supplying lubricating oil under the barring shutdown working condition, the hydraulic control type automatic barring gear control valve block comprises two oil inlets and three oil outlets, and four main oil ways are formed between the oil inlets and the oil outlets; the four main oil ways are a valve block control oil way, a valve block working oil way, a valve block lubricating oil way and a sliding block oil return oil way. An oil way inlet of the valve block control oil way is a jacking oil inlet, and an oil way outlet of the valve block control oil way is a control oil outlet. An oil way inlet of the valve block working oil way is a jacking oil inlet, and an oil way outlet of the valve block working oil way is a working oil outlet. An oil way inlet of the valve block lubricating oil way is a lubricating oil inlet, and an oil way outlet is a working oil outlet; an oil way inlet of the sliding block oil return oil way is an oil drainage port of each valve block, and an oil way outlet is an oil return port. The hydraulic control type automatic turning gear is used for hydraulic control type automatic turning gears.

Description

Technical Field

[0001] The invention relates to a control valve block for a hydraulically controlled automatic cranking device, belonging to the technical field of hydraulically controlled automatic cranking devices. Background Art

[0002] The hydraulically controlled automatic cranking device is usually equipped in a gas turbine or steam turbine unit. Before the unit is started or after it is shut down, the rotor is cranked to keep it running at a relatively low speed (several revolutions to several hundred revolutions per minute). The purpose is to reduce the starting torque of the unit and to cool the rotor evenly. In order to save installation space, a hydraulic motor is generally selected as the main power device of the cranking device, and a corresponding control valve block is equipped to control the speed of the hydraulic motor and provide the required control oil for the clutch inside the cranking device. The hydraulically controlled automatic cranking device usually has the following four working conditions. The functions of the existing control valve blocks under each working condition are shown in Table 1:

[0003] Table 1

[0004]

[0005] Analysis of the structure and function of the control valve block of the existing hydraulically controlled automatic turning device shows that the existing control valve block has a simple structure and a simple control principle, but it still has certain deficiencies in function:

[0006] First, the existing control valve block uses the same relief valve to control the hydraulic motor working oil flow and motor speed in both static and dynamic conditions. Equipped with only one relief valve, due to the existence of control dead zone within a larger flow control range, it is impossible to simultaneously meet the control requirements of small working oil flow and high control accuracy when the turning is statically put into operation, and large working oil flow and relatively high control accuracy when the turning is dynamically put into operation, thereby reducing the control accuracy of the hydraulic motor speed. The lack of control accuracy of the hydraulic motor speed will cause the turning device to frequently fail to be put into operation smoothly during use, which will greatly reduce the working efficiency of the turning device and even seriously affect the service life of the internal transmission shaft system of the turning device, reducing the reliability of the turning device.

[0007] Secondly, the existing control valve block directly uses the unit lubricating oil as the control oil of the clutch inside the turning device, and the unit lubricating oil is usually at a low pressure (mostly 0.1-0.3MPa), which makes the turning clutch control oil pressure relatively low and uncontrollable. When the control oil leakage is large and the clutch sliding parts are heavy, the clutch may not engage smoothly or the engagement speed is slow, which will directly reduce the smoothness and speed of the turning device.

[0008] Finally, the existing control valve block is not provided with a hydraulic motor lubrication oil circuit when the turning device is stopped. This may cause the hydraulic motor to get stuck due to sludge or foreign matter in the working oil circuit when the turning device is started again after a long period of shutdown, which also reduces the working efficiency and service life of the turning device to a certain extent. Summary of the invention

[0009] The purpose of the present invention is to solve the problems of low control accuracy of hydraulic motor speed, low cranking control oil pressure and failure to supply lubricating oil under cranking shutdown conditions in the existing hydraulically controlled automatic cranking device control valve block, and provide a control valve block for a hydraulically controlled automatic cranking device.

[0010] The control valve block for a hydraulically controlled automatic turning device of the present invention comprises: two oil inlets and three oil outlets, and four main oil paths are formed between the oil inlets and the oil outlets;

[0011] The two oil inlets are a top shaft oil inlet and a lubricating oil inlet; the top shaft oil inlet is connected to the top shaft oil circuit of the unit, and the lubricating oil inlet is connected to the lubricating oil circuit of the unit;

[0012] The three oil outlets are a control oil outlet, a working oil outlet and an oil return outlet; the control oil outlet is connected to the clutch inside the turning gear, the working oil outlet is connected to the oil inlet of the hydraulic motor, and the oil return outlet is connected to the oil return line of the unit;

[0013] The four main oil circuits are the valve block control oil circuit, the valve block working oil circuit, the valve block lubrication oil circuit and the slide block return oil circuit;

[0014] The oil circuit inlet of the valve block control oil circuit is the top shaft oil inlet, and the oil circuit outlet is the control oil outlet;

[0015] The oil circuit inlet of the valve block working oil circuit is the top shaft oil inlet, and the oil circuit outlet is the working oil outlet;

[0016] The oil circuit inlet of the lubricating oil circuit of the valve block is a lubricating oil inlet, and the oil circuit outlet is a working oil outlet;

[0017] The oil circuit inlet of the oil return circuit of the slide block is the oil drain port of each valve block, and the oil circuit outlet is the oil return port.

[0018] Preferably, each valve group is used to realize the on-off of the main oil circuit; the valve groups specifically include: a first solenoid valve, a pressure reducing valve, a second solenoid valve, a small flow speed regulating valve group, a first check valve, a third solenoid valve, a large flow speed regulating valve group, a second check valve, a third check valve and a throttle valve;

[0019] The first solenoid valve is used to control the on-off of the control oil circuit of the valve block; the third solenoid valve is used to control the on-off of the working oil circuit of the valve block; the third one-way valve is used to control the on-off of the lubrication oil circuit of the valve block;

[0020] The second solenoid valve is used to switch the cranking gear static / dynamic input working condition; the small flow speed regulating valve group is used to adjust the working oil flow under the cranking gear static input working condition; the large flow speed regulating valve group is used to adjust the working oil flow under the cranking gear dynamic input working condition;

[0021] The pressure reducing valve is used to adjust the turning control oil pressure; the first check valve and the second check valve are used to prevent oil backflow; the throttle valve is used to adjust the lubrication flow.

[0022] Preferably, the small flow rate speed regulating valve group is composed of a speed regulating valve, and the adjustable flow rate range is 0.5 to 50 L / min.

[0023] Preferably, the large flow rate speed regulating valve group is composed of a proportional throttle valve and a pressure compensator, and the adjustable flow rate range is 30 to 500 L / min.

[0024] Preferably, under the static operation condition of the turning gear, the working conditions of each valve group include:

[0025] Adjust the pressure reducing valve to keep the oil pressure of the cranking gear at the control oil pressure required by the clutch inside the cranking gear, and adjust the small flow speed regulating valve group to keep the flow rate corresponding to the clutch slip gear speed of 1-3r / min;

[0026] After receiving the static start command of the turning gear, the first solenoid valve is energized, the valve block controls the oil circuit to maintain the passage, and the top shaft oil enters the clutch inside the turning gear through the valve block control oil circuit;

[0027] The second solenoid valve is powered off and switched to the static cranking operation; the third solenoid valve is powered on, the valve block working oil circuit remains open, and the top shaft oil is adjusted through the small flow speed regulating valve group to drive the clutch sliding part to operate within the speed range of 1 to 3 r / min. The control oil pushes the cranking clutch to engage, completing the static cranking operation.

[0028] Preferably, under the condition of dynamic turning, the working conditions of each valve group include:

[0029] After receiving the dynamic input command of the turning gear, the first solenoid valve is energized, the valve block controls the oil circuit to maintain the passage, and the top shaft oil enters the clutch inside the turning gear through the valve block control oil circuit;

[0030] The second solenoid valve is energized and switched to the dynamic cranking operation condition; the third solenoid valve is energized, the working oil circuit of the valve block remains open, and there is no oil reflux. The top shaft oil is regulated by the large-flow speed regulating valve group, and the large-flow speed regulating valve group regulates the working oil flow according to the motor speed feedback signal, until the working oil drives the hydraulic motor to increase speed and maintain it at the rated speed of the motor; when the rotor slows down to the rated speed of the cranking, the control oil pushes the cranking clutch to engage, completing the dynamic cranking operation process.

[0031] Preferably, under the cranking and stopping condition, the working conditions of each valve group include:

[0032] Adjust the throttle valve to keep the flow rate corresponding to the hydraulic motor speed of 1-3r / min;

[0033] When the turning gear is in the disengaged state, after receiving the turning gear shutdown command, the first solenoid valve, the second solenoid valve and the third solenoid valve are de-energized, the valve block control oil circuit and the valve block working oil circuit are both disconnected, the valve block working oil circuit pressure is lower than the valve block lubricating oil circuit pressure, the third one-way valve opens, and the lubricating oil enters the hydraulic motor through the valve block lubricating oil circuit, driving the hydraulic motor to operate within the speed range of 1 to 3 r / min.

[0034] Preferably, the valve block controls the top shaft oil in the oil circuit, which is used to control the engagement and disengagement of the clutch inside the turning gear, and provide lubricating oil for the transmission shaft system inside the turning gear device.

[0035] Preferably, the valve block working oil circuit includes a static cranking working oil circuit and a dynamic cranking working oil circuit;

[0036] The jacking oil in the static cranking working oil circuit is used to provide the hydraulic motor with controllable flow of working oil under the static cranking operation condition, thereby controlling the speed of the hydraulic motor;

[0037] The jacking oil in the dynamic cranking working oil circuit is used to provide the hydraulic motor with controllable flow of working oil under the cranking dynamic input condition, thereby controlling the speed of the hydraulic motor.

[0038] Preferably, the lubricating oil in the lubricating oil circuit of the valve block is used to continuously supply lubricating oil to the hydraulic motor when the turning device is shut down.

[0039] Advantages of the present invention: The control valve block for the hydraulically controlled automatic turning device proposed by the present invention can provide the hydraulically controlled automatic turning device with flow-controllable working oil, pressure-controllable control oil and shutdown lubricating oil according to different working conditions. At the same time, it can more accurately control the speed of the hydraulic motor and prevent the motor from getting stuck, which not only ensures the smoothness and rapidity of turning input, but also improves the working efficiency and reliability of turning. The control valve block has a high control accuracy for the turning device speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic diagram of the working principle of the control valve block for the hydraulically controlled automatic turning device of the present invention under the turning static input condition;

[0041] Figure 2 It is a schematic diagram of the working principle of the control valve block for the hydraulically controlled automatic turning device of the present invention under the turning dynamic input condition;

[0042] Figure 3The present invention is a schematic diagram of the working principle of the control valve block for the hydraulically controlled automatic cranking device under the cranking stop condition. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0044] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0045] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0046] Embodiment 1:

[0047] Combine the following Figure 1-Figure 3 The present embodiment is described as follows. The present embodiment describes a control valve block for a hydraulically controlled automatic turning device, which comprises: two oil inlets and three oil outlets, wherein four main oil paths are formed between the oil inlets and the oil outlets;

[0048] The two oil inlets are a top shaft oil inlet and a lubricating oil inlet; the top shaft oil inlet is connected to the top shaft oil circuit of the unit, and the lubricating oil inlet is connected to the lubricating oil circuit of the unit;

[0049] The three oil outlets are a control oil outlet, a working oil outlet and an oil return outlet; the control oil outlet is connected to the clutch inside the turning gear, the working oil outlet is connected to the oil inlet of the hydraulic motor, and the oil return outlet is connected to the oil return line of the unit;

[0050] The four main oil circuits are the valve block control oil circuit, the valve block working oil circuit, the valve block lubrication oil circuit and the slide block return oil circuit;

[0051] The oil circuit inlet of the valve block control oil circuit is the top shaft oil inlet, and the oil circuit outlet is the control oil outlet;

[0052] The oil circuit inlet of the valve block working oil circuit is the top shaft oil inlet, and the oil circuit outlet is the working oil outlet;

[0053] The oil circuit inlet of the lubricating oil circuit of the valve block is a lubricating oil inlet, and the oil circuit outlet is a working oil outlet;

[0054] The oil circuit inlet of the oil return circuit of the slide block is the oil drain port of each valve block, and the oil circuit outlet is the oil return port.

[0055] Further, each valve group is used to realize the on-off of the main oil circuit; the valve groups specifically include: a first solenoid valve 10, a pressure reducing valve 20, a second solenoid valve 30, a small flow speed regulating valve group 40, a first check valve 50, a third solenoid valve 60, a large flow speed regulating valve group 70, a second check valve 80, a third check valve 90 and a throttle valve 100;

[0056] The first solenoid valve 10 is used to control the on-off of the control oil circuit of the valve block; the third solenoid valve 60 is used to control the on-off of the working oil circuit of the valve block; the third check valve 90 is used to control the on-off of the lubricating oil circuit of the valve block;

[0057] The second solenoid valve 30 is used to switch the turning gear static / dynamic input working condition; the small flow speed regulating valve group 40 is used to adjust the working oil flow under the turning gear static input working condition; the large flow speed regulating valve group 70 is used to adjust the working oil flow under the turning gear dynamic input working condition;

[0058] The pressure reducing valve 20 is used to adjust the turning control oil pressure; the first one-way valve 50 and the second one-way valve 80 are used to prevent the oil from flowing back; and the throttle valve 100 is used to adjust the lubrication flow.

[0059] Furthermore, the small flow rate regulating valve group 40 is composed of a speed regulating valve, and the adjustable flow rate range is 0.5 to 50 L / min;

[0060] The large flow rate speed regulating valve group 70 is composed of a proportional throttle valve and a pressure compensator, and the adjustable flow rate range is 30 to 500 L / min.

[0061] Furthermore, under the static cranking condition, the working conditions of each valve group include:

[0062] Adjust the pressure reducing valve 20 until the oil pressure of the cranking gear is maintained at the control oil pressure required by the clutch inside the cranking gear, and adjust the small flow speed regulating valve group 40 until the flow rate is maintained at the corresponding flow rate when the clutch slip gear speed is 1 to 3 r / min;

[0063] After receiving the static start command of the turning gear, the first solenoid valve 10 is energized, the valve block controls the oil circuit to maintain the passage, and the top shaft oil enters the clutch inside the turning gear through the valve block control oil circuit;

[0064] The second solenoid valve 30 is powered off and switched to the static cranking operation; the third solenoid valve 60 is powered on, the valve block working oil circuit remains open, and the top shaft oil is adjusted through the small flow speed regulating valve group 40 to drive the clutch sliding part to operate within the speed range of 1 to 3 r / min, and the control oil drives the cranking clutch to engage, completing the static cranking operation.

[0065] Furthermore, under the condition of dynamic cranking, the working conditions of each valve group include:

[0066] After receiving the dynamic input command of the turning gear, the first solenoid valve 10 is energized, the valve block controls the oil circuit to maintain the passage, and the top shaft oil enters the clutch inside the turning gear through the valve block control oil circuit;

[0067] The second solenoid valve 30 is energized and switched to the dynamic cranking operation; the third solenoid valve 60 is energized, the valve block working oil circuit remains open, and there is no oil reflux, the top shaft oil is adjusted through the large-flow speed regulating valve group 70, and the large-flow speed regulating valve group 70 adjusts the working oil flow according to the motor speed feedback signal, until the working oil drives the hydraulic motor to increase speed and maintain it at the rated speed of the motor; when the rotor slows down to the rated speed of the cranking, the control oil drives the cranking clutch to engage, completing the dynamic cranking operation process.

[0068] Furthermore, under the cranking shutdown condition, the working conditions of each valve group include:

[0069] Adjust the throttle valve 100 until the flow rate is maintained at the corresponding flow rate when the hydraulic motor speed is 1 to 3 r / min;

[0070] When the turning gear is in the disengaged state, after receiving the turning gear stop command, the first solenoid valve 10, the second solenoid valve 30 and the third solenoid valve 60 are powered off, the valve block control oil circuit and the valve block working oil circuit are disconnected, the valve block working oil circuit pressure is lower than the valve block lubricating oil circuit pressure, the third one-way valve 90 is opened, and the lubricating oil enters the hydraulic motor through the valve block lubricating oil circuit, driving the hydraulic motor to operate within the speed range of 1 to 3 r / min.

[0071] Furthermore, the valve block controls the top shaft oil in the oil circuit, which is used to control the engagement and disengagement of the clutch inside the turning gear, and provides lubricating oil for the transmission shaft system inside the turning gear device.

[0072] Furthermore, the valve block working oil circuit includes a static cranking working oil circuit and a dynamic cranking working oil circuit;

[0073] The jacking oil in the static cranking working oil circuit is used to provide the hydraulic motor with controllable flow of working oil under the static cranking operation condition, thereby controlling the speed of the hydraulic motor;

[0074] The jacking oil in the dynamic cranking working oil circuit is used to provide the hydraulic motor with controllable flow of working oil under the cranking dynamic input condition, thereby controlling the speed of the hydraulic motor.

[0075] Furthermore, the lubricating oil in the lubricating oil circuit of the valve block is used to continuously supply lubricating oil to the hydraulic motor when the turning device is shut down.

[0076] In the present invention, the control valve block of the hydraulically controlled automatic turning device is provided with two inlets, namely: the top shaft oil inlet and the lubricating oil inlet; and three outlets, namely: the control oil outlet, the working oil outlet and the oil return port. Among them, the top shaft oil inlet of the valve block is connected to the top shaft oil circuit (high-pressure oil circuit) of the unit, the lubricating oil inlet of the valve block is connected to the lubricating oil circuit (low-pressure oil circuit) of the unit, the control oil outlet of the valve block is connected to the clutch inside the turning gear, the working oil outlet of the valve block is connected to the oil inlet of the hydraulic motor, and the oil return port of the valve block is connected to the oil return circuit of the unit. A total of four main oil circuits are formed inside the control valve block, namely: the valve block control oil circuit, the working oil circuit, the lubricating oil circuit and the oil return circuit. The inlets, outlets and functions of each main oil circuit of the control valve are shown in Table 2:

[0077] Table 2

[0078]

[0079] The control valve block of the hydraulically controlled automatic cranking device is also equipped with multiple solenoid valves, one-way valves, pressure reducing valves, small flow speed regulating valve groups and large flow speed regulating valve groups. The on and off of the working oil circuit, the on and off of the control oil circuit, and the switching of the static cranking oil circuit and the dynamic cranking oil circuit are realized by controlling the on and off of each solenoid valve. The working oil circuit of the control valve block is divided into the static cranking working oil circuit and the dynamic cranking working oil circuit. The static cranking working oil circuit is equipped with a small flow speed regulating valve group, which is composed of speed regulating valves, which can greatly throttle and can achieve flow regulation more accurately within a small flow range (0.5~50L / min); the dynamic cranking working oil circuit is equipped with a large flow speed regulating valve group, which is composed of high-precision speed regulating valves, which can achieve flow regulation more accurately within a large flow range (30~500L / min). This design method can ensure that the hydraulic motor speed can be more accurately controlled when the rotor is cranked under static or dynamic conditions. The control oil circuit of the control valve block is connected to the top shaft oil of the unit with higher pressure, and the pressure reducing valve is used to reduce its pressure to the control oil pressure that meets the use requirements of the clutch, ensuring that the control oil pressure is stable and controllable. The lubricating oil circuit of the control valve block is equipped with a one-way valve and a throttle valve. After adjusting the lubricating oil flow according to the use requirements, the lubricating oil can be continuously supplied to the hydraulic motor when the turning device is stopped to prevent the motor from getting stuck in the turning device.

[0080] The control valve block of the hydraulic automatic turning device is mainly composed of a solenoid valve 10, a pressure reducing valve 20, a solenoid valve 30, a small flow speed regulating valve group 40, a check valve 50, a solenoid valve 60, a large flow speed regulating valve group 70, a check valve 80, a check valve 90, a throttle valve 100 and corresponding pipelines. The solenoid valve 10 is used to control the on-off of the control oil circuit; the pressure reducing valve 20 is used to adjust the turning control oil pressure; the solenoid valve 30 is used to switch the static / dynamic turning condition; the solenoid valve 60 is used to control the on-off of the working oil circuit; the small flow speed regulating valve group 40 is composed of a speed regulating valve, which is used to accurately adjust the working oil flow under the static turning condition; the large flow speed regulating valve group 70 is composed of a proportional throttle valve and a pressure compensator, which is used to accurately adjust the working oil flow under the dynamic turning condition; the check valve 90 is used to control the on-off of the lubricating oil circuit; the throttle valve 100 is used to adjust the lubricating flow; the check valves 50 and 80 are used to prevent oil backflow.

[0081] Figure 1 It is to control the working condition of each valve group in the valve block under the static cranking condition. During the debugging process, the pressure reducing valve 20 is pre-adjusted until the oil pressure is maintained at the control oil pressure required by the clutch inside the cranking; the small flow speed regulating valve group 40 is adjusted to keep its flow rate at the corresponding flow rate when the clutch sliding gear speed is 1-3r / min. When the system issues a static input command, the solenoid valve 10 in the control valve block is energized, the cranking control oil circuit is unblocked, and the unit top shaft oil enters the clutch inside the cranking through the control oil circuit; the solenoid valve 30 is de-energized and switched to the static cranking condition; the solenoid valve 60 is energized, the static cranking working oil circuit is unblocked, and the unit top shaft oil flows through the pre-set small flow speed regulating valve group 40, and drives the clutch sliding part to operate within the speed range of 1-3r / min according to the required flow rate. After the control oil drives the cranking clutch to engage, the static cranking process is completed.

[0082] Figure 2 It controls the working conditions of each valve group in the valve block under the conditions of dynamic cranking and continuous cranking. When the system issues a dynamic cranking instruction, the solenoid valve 10 in the control valve block is energized, the cranking control oil circuit is unblocked, and the unit top shaft oil enters the clutch inside the cranking through the control oil circuit; the solenoid valve 30 is energized and switched to the dynamic cranking condition; the solenoid valve 60 is energized, the dynamic cranking working oil circuit is unblocked and there is no oil reflux phenomenon, and the unit top shaft oil flows through the large flow speed regulating valve group 80, and the valve group automatically adjusts the working oil flow according to the motor speed feedback signal until the working oil drives the hydraulic motor to increase speed and maintain the rated speed of the motor. When the rotor slows down to the rated speed of the cranking, the control oil pushes the clutch to engage, completing the dynamic cranking process. After dynamic input, the large flow speed regulating valve group 80 is controlled to automatically adjust the working oil flow according to the rotor speed feedback signal, so that the cranking device drives the rotor to continue to operate at the rated speed.

[0083] Figure 3It is to control the working condition of each valve group in the valve block under the condition of turning the gear to stop. During the debugging process, the throttle valve 100 is pre-adjusted to keep its flow rate at the corresponding flow rate when the speed of the hydraulic motor is 1-3r / min. When the turning gear is in the disengaged state, when the system issues a turning gear shutdown command, the control solenoid valves 10, 30, and 60 are powered off. At this time, the control oil circuit and the working oil circuit of the valve block are disconnected, the pressure of the working oil circuit is lower than the pressure of the lubricating oil circuit, the one-way valve 90 is opened, and the unit lubricating oil flows through the control valve block to lubricate and enter the hydraulic motor, driving the motor to keep running at 1-3r / min continuously to prevent jamming when starting again.

[0084] The top shaft oil of the unit flows into the valve block control oil circuit, which is used to control the engagement and disengagement of the clutch inside the turning gear and provide lubricating oil for the transmission shaft system inside the turning gear device; the top shaft oil of the unit flows into the valve block working oil circuit, which is divided into static turning gear working oil circuit and dynamic turning gear working oil circuit, which are respectively used to provide the hydraulic motor with controllable flow of working oil under the conditions of static turning gear input and dynamic turning gear input, thereby accurately controlling the speed of the hydraulic motor; the lubricating oil of the unit flows into the lubricating oil circuit of the valve block, which is used to continuously supply lubricating oil to the hydraulic motor when the turning gear device is shut down.

[0085] A solenoid valve 10 is provided on the control oil circuit of the valve block for controlling the on-off of the control oil circuit, and a pressure reducing valve 20 is provided for adjusting the control oil pressure; a solenoid valve 30 is provided on the main working oil circuit of the valve block for switching the static / dynamic cranking working conditions, and a solenoid valve 60 is provided for controlling the on-off of the main working oil circuit; a small flow rate speed regulating valve group 40 is provided on the static cranking working oil circuit of the valve block, and the valve group is composed of speed regulating valves, which can throttle greatly and can achieve flow regulation more accurately within a smaller flow range (0.5-50L / min); a large flow rate speed regulating valve group 70 is provided on the dynamic cranking working oil circuit of the valve block, and the valve group is composed of high-precision speed regulating valves, which can achieve flow regulation more accurately within a larger flow range (30-500L / min); check valves 50 and 80 are provided on the static and dynamic working oil circuits of the valve block respectively to prevent oil backflow; a check valve 90 is provided on the lubricating oil circuit of the valve block for controlling the on-off of the lubricating oil circuit, and a throttle valve 100 is provided for adjusting the lubrication flow.

[0086] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. It should therefore be understood that many modifications may be made to the exemplary embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the various dependent claims and features described herein may be combined in a manner different from that described in the original claims. It should also be understood that features described in conjunction with individual embodiments may be used in other described embodiments.

Claims

1. A control valve block for a hydraulically controlled automatic turning device, characterized in that: It includes: Two oil inlets and three oil outlets, four main oil passages are formed between the oil inlets and the oil outlets; The two oil inlets are a top shaft oil inlet and a lubricating oil inlet; the top shaft oil inlet is connected to the top shaft oil circuit of the unit, and the lubricating oil inlet is connected to the lubricating oil circuit of the unit; The three oil outlets are a control oil outlet, a working oil outlet and an oil return outlet; the control oil outlet is connected to the clutch inside the turning gear, the working oil outlet is connected to the oil inlet of the hydraulic motor, and the oil return outlet is connected to the oil return line of the unit; The four main oil circuits are the valve block control oil circuit, the valve block working oil circuit, the valve block lubrication oil circuit and the slide block return oil circuit; The oil circuit inlet of the valve block control oil circuit is the top shaft oil inlet, and the oil circuit outlet is the control oil outlet; The oil circuit inlet of the valve block working oil circuit is the top shaft oil inlet, and the oil circuit outlet is the working oil outlet; The oil circuit inlet of the lubricating oil circuit of the valve block is a lubricating oil inlet, and the oil circuit outlet is a working oil outlet; The oil circuit inlet of the oil return circuit of the slide block is the oil drain port of each valve block, and the oil circuit outlet is the oil return port.

2. A control valve block for a hydraulically controlled automatic turning device according to claim 1, characterized in that: The main oil circuit is switched on and off by using valve groups; the valve groups specifically include: a first solenoid valve (10), a pressure reducing valve (20), a second solenoid valve (30), a small flow rate speed regulating valve group (40), a first check valve (50), a third solenoid valve (60), a large flow rate speed regulating valve group (70), a second check valve (80), a third check valve (90) and a throttle valve (100); The first solenoid valve (10) is used to control the on-off of the control oil circuit of the valve block; the third solenoid valve (60) is used to control the on-off of the working oil circuit of the valve block; the third check valve (90) is used to control the on-off of the lubricating oil circuit of the valve block; The second solenoid valve (30) is used to switch between the static and dynamic operation conditions of the cranking gear; the small flow rate speed regulating valve group (40) is used to adjust the flow rate of the working oil under the static operation condition of the cranking gear; and the large flow rate speed regulating valve group (70) is used to adjust the flow rate of the working oil under the dynamic operation condition of the cranking gear; The pressure reducing valve (20) is used to adjust the turning control oil pressure; the first check valve (50) and the second check valve (80) are used to prevent oil backflow; and the throttle valve (100) is used to adjust the lubrication flow.

3. The control valve block for a hydraulically controlled automatic turning device according to claim 2, characterized in that: The small flow rate regulating valve group (40) is composed of a regulating valve, and the adjustable flow rate range is 0.5-50 L / min.

4. The control valve block for a hydraulically controlled automatic turning device according to claim 2, characterized in that: The large flow rate speed regulating valve group (70) is composed of a proportional throttle valve and a pressure compensator, and the adjustable flow rate range is 30 to 500 L / min.

5. The control valve block for a hydraulically controlled automatic turning device according to claim 2, characterized in that: Under the static cranking condition, the working conditions of each valve group include: The pressure reducing valve (20) is adjusted to keep the oil pressure of the cranking gear at the control oil pressure required by the clutch inside the cranking gear, and the small flow rate regulating valve group (40) is adjusted to keep the flow rate at the corresponding flow rate when the clutch sliding gear speed is 1-3 r / min; After receiving the static start command of the turning gear, the first solenoid valve (10) is energized, the valve block controls the oil circuit to maintain the passage, and the top shaft oil enters the clutch inside the turning gear through the valve block control oil circuit; The second solenoid valve (30) is powered off and switched to the cranking static input working condition; the third solenoid valve (60) is powered on, the valve block working oil circuit remains open, the top shaft oil is adjusted in flow rate by the small flow speed regulating valve group (40), the clutch sliding member is driven to operate within the speed range of 1 to 3 r / min, the control oil drives the cranking clutch to engage, and the cranking static input process is completed.

6. The control valve block for a hydraulically controlled automatic turning device according to claim 2, characterized in that: Under the condition of dynamic cranking, the working conditions of each valve group include: After receiving the turning gear dynamic input command, the first solenoid valve (10) is energized, the valve block controls the oil circuit to maintain the passage, and the top shaft oil enters the clutch inside the turning gear through the valve block control oil circuit; The second solenoid valve (30) is energized to switch to the cranking dynamic input working condition; the third solenoid valve (60) is energized, the valve block working oil circuit remains open, and there is no oil backflow phenomenon, the top shaft oil is adjusted through the large flow speed regulating valve group (70), and the large flow speed regulating valve group (70) adjusts the working oil flow according to the motor speed feedback signal until the working oil drives the hydraulic motor to increase speed and maintain the rated speed of the motor; when the rotor speed decreases to the cranking rated speed, the control oil drives the cranking clutch to engage, completing the cranking dynamic input process.

7. The control valve block for a hydraulically controlled automatic turning device according to claim 2, characterized in that: Under the cranking shutdown condition, the working conditions of each valve group include: Adjust the throttle valve (100) until the flow rate is maintained at a flow rate corresponding to a hydraulic motor speed of 1 to 3 r / min; When the turning gear is in the disengaged state and a turning gear stop command is received, the first solenoid valve (10), the second solenoid valve (30) and the third solenoid valve (60) are powered off, the valve block control oil circuit and the valve block working oil circuit are disconnected, the pressure of the valve block working oil circuit is lower than the pressure of the valve block lubricating oil circuit, the third one-way valve (90) is opened, and the lubricating oil enters the hydraulic motor through the valve block lubricating oil circuit, driving the hydraulic motor to operate within a speed range of 1 to 3 r / min.

8. A control valve block for a hydraulically controlled automatic turning device according to any one of claims 1 to 7, characterized in that: The valve block controls the top shaft oil in the oil circuit, is used to control the engagement and disengagement of the clutch inside the turning gear, and provides lubricating oil for the transmission shaft system inside the turning gear device.

9. A control valve block for a hydraulically controlled automatic turning device according to any one of claims 1 to 7, characterized in that: The valve block working oil circuit includes a static cranking working oil circuit and a dynamic cranking working oil circuit; The jacking oil in the static cranking working oil circuit is used to provide the hydraulic motor with controllable flow of working oil under the static cranking operation condition, thereby controlling the speed of the hydraulic motor; The jacking oil in the dynamic cranking working oil circuit is used to provide the hydraulic motor with controllable flow of working oil under the cranking dynamic input condition, thereby controlling the speed of the hydraulic motor.

10. A control valve block for a hydraulically controlled automatic turning device according to any one of claims 1 to 7, characterized in that: The lubricating oil in the lubricating oil circuit of the valve block is used to continuously supply lubricating oil to the hydraulic motor when the turning device is shut down.

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