A winch parking brake valve group
Through the combined design of the winch parking brake valve group, the pressure fluctuation problem of the winch system during start and stop is solved, low energy consumption and high stability and equipment protection are achieved, ensuring reliable stop of the winch.
Patent Information
- Application Number
- CN201910537070.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2019-06-20
- Publication Date
- 2025-07-29
- Estimated Expiration
- 2039-06-20
AI Technical Summary
The existing winch parking brake cannot effectively prevent instantaneous pressure fluctuations and impacts when the system starts and when the motor stops, resulting in equipment damage and safety accidents. The control pressure of the balance valve is equivalent to the system pressure, resulting in large impacts.
Using a winch parking brake valve group including a release brake assembly, a brake parking assembly and a safety protection assembly, the motor is controlled through a combination design of the first and second check valves, balance valves and relief valves, and the forward and reverse rotation of the motor is quickly unloaded when the pressure fluctuates to prevent the motor from being damaged.
It achieves improving the stability of the valve group under low energy consumption, reducing reversing and start-stop impacts, protecting the equipment from damage, and ensuring that the winch is reliably stopped in the required position.
Smart Images
Figure CN112110366B_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a valve group, and more particularly to a winch parking brake valve group. Background Art
[0002] Due to the inherent leakage in the motor itself, mechanical devices driven by motors all require additional parking brakes. During operation, only when the driving pressure of the motor reaches a sufficient level to open the lowering circuit can the parking brake be released to prevent "runaway" of the vehicle. When working, the load can stay at any position relying on the parking brake. Since both chambers will be alternately subjected to positive and negative loads, balance valves are installed at the outlets of both chambers to ensure smooth operation and reliable pause at the required positions, even in case of pipeline rupture and "out-of-control" of the motor resulting in lowering.
[0003] Conventional parking brakes cannot prevent the instantaneous pressure fluctuations and shocks caused during system startup and motor stop, which may lead to motor damage and safety accidents. Moreover, since the control pressure of the balance valve is almost equal to the system pressure, the system will experience significant shocks during motor forward and reverse rotations and stops, which is not conducive to the use of the equipment. Summary of the Invention
[0004] The purpose of the present invention is to provide a winch parking brake valve group to overcome the deficiencies of the above-mentioned existing technologies.
[0005] The purpose of the present invention can be achieved through the following technical solutions:
[0006] A winch parking brake valve group includes:
[0007] A brake release assembly: including a forward rotation control unit, a reverse rotation control unit, and a shuttle valve respectively connected to the forward rotation control unit and the reverse rotation control unit;
[0008] A brake stop assembly: including a first check valve connected to the forward rotation control unit and a second check valve connected to the reverse rotation control unit;
[0009] A safety protection assembly: including a first relief valve connected to the forward rotation control unit and a second relief valve connected to the reverse rotation control unit.
[0010] Further, the forward rotation control unit includes an oil port A1, a first balance valve, and an oil port A arranged in sequence along the direction of hydraulic oil flow;
[0011] The reverse rotation control unit includes an oil port B1, a second balance valve, and an oil port B arranged in sequence along the direction of hydraulic oil flow;
[0012] The oil ports A and B are respectively connected to the motor end.
[0013] Further, a first throttle valve and a second throttle valve are respectively arranged on the first one-way valve and the second one-way valve.
[0014] Further, the shuttle valve is connected to the oil port C.
[0015] Further, safety pressures are set for both the first balance valve and the second balance valve.
[0016] Further, the allowable working ambient temperature of the valve group is -20°C - 90°C.
[0017] Further, the working oil temperature of the valve group is -30°C - 90°C.
[0018] Further, the oil ports A and B are blocked with iron plugs, and the other oil ports are blocked with plastic plugs.
[0019] This valve group is supplied with oil from the hydraulic source through oil ports A1 and B1. At the same time, the forward and reverse rotations of the motor are controlled through oil ports A and B connected to the motor end. Each branch contains a first balance valve or a second balance valve. The one-way parts of these two balance valves allow the oil to flow freely from oil port A1 to oil port A and from oil port B1 to oil port B. When the oil flows from oil port A1 to oil port A, a part of it will flow through the circuit as pilot oil to the control port of the first balance valve, thus opening the first balance valve and causing the motor to rotate forward. When the oil flows from oil port B1 to oil port B, a part of it will flow through the circuit as pilot oil to the control port of the second balance valve, thus opening the second balance valve and causing the motor to rotate in reverse. In the reverse direction, it can prevent the oil from flowing from oil port A to oil port A1 and from oil port B to oil port B1, so as to ensure that the winch can reliably stop at the required position. At the same time, during the above operation process, due to the existence of the first check valve and the second check valve, when a part of the oil ports A and B is used as pilot control oil and flows through the circuit into the first balance valve and the second balance valve, a part of it will flow away through the first throttle valve, the second throttle valve, the first check valve and the second check valve. The first throttle valve and the second throttle valve limit the discharged flow rate to prevent insufficient flow rate to open the first balance valve and the second balance valve. At the same time, no matter whether the oil enters the motor from oil port A1 or oil port B1, a part of the oil will enter the shuttle valve, and then the shuttle valve will release the brake device through oil port C, so that the motor can operate as required. The paired first relief valve and second relief valve can control the input pressure during equipment startup and the output pressure when the motor stops. When pressure spikes and pressure fluctuations occur, the first relief valve and the second relief valve can quickly open and discharge a part of the oil through the pressureless circuit. That is, if the oil flows from oil port A to oil port A1 or from oil port A1 to oil port A, the oil will be discharged into the circuit of oil port B, and vice versa. At the same time, in order to prevent the motor from being damaged due to pressure buildup under any circumstances, the first balance valve and the second balance valve will set a safety pressure. This setting will cause unloading when the motor pressure exceeds the set pressure to protect the system components from being damaged.
[0020] Compared with the prior art, the present invention has the following beneficial effects:
[0021] 1. The present invention selects the first balance valve and the second balance valve with a lower control ratio. While ensuring lower energy consumption, through combination with the first check valve and the second check valve, excellent stability will be obtained. At the same time, there will be no significant increase in energy consumption. At the same time, due to the improvement of stability, the descending deceleration function of the balance valve, that is, the liquid-controlled throttling function, will also be better reflected in the actual use process.
[0022] 2. Considering different requirements of customers for leakage in the actual application process, the first overflow valve and the second overflow valve can be selected and replaced between the direct-acting type and the pilot-operated type. When internal leakage is more emphasized and the motor needs to stay at a certain position for a long time, a direct-acting overflow valve can be selected to obtain better internal leakage performance. When a faster opening effect of pressure spikes and fluctuations and flow rate are required, a pilot-operated overflow valve can be considered.
[0023] 3. New cartridge-type paired one-way valves are added, so that under relatively large control pressures, the balance valve can open more smoothly and quickly, thus avoiding situations such as commutation shock and start-stop shock.
[0024] 4. New cartridge-type paired overflow valves are added to protect other components in the winch system, change the previous stacked installation, save costs and reduce the product size. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 is the front view of the valve group structure of the present invention;
[0026] Figure 2 is Figure 1 the schematic diagram of the F-F cross-section in
[0027] Figure 3 is Figure 1 the schematic diagram of the G-G cross-section in
[0028] Figure 4 is the top view of the valve group structure of the present invention;
[0029] Figure 5 is Figure 4 the schematic diagram of the C-C cross-section in
[0030] Figure 6 is Figure 4 the schematic diagram of the J-J cross-section in
[0031] As indicated by the reference numerals in the figure:
[0032] 1 - first balance valve, 2 - second balance valve, 3 - shuttle valve, 4 - first one-way valve, 5 - second one-way valve, 6 - first overflow valve, 7 - second overflow valve, 8 - first restrictor, 9 - second restrictor. DETAILED DESCRIPTION OF THE INVENTION
[0033] The present invention will be described in detail below with reference to the drawings and specific embodiments.
[0034] Embodiment
[0035] A winch parking brake valve group, as Figure 1 and Figure 4 shown, includes:
[0036] Release the brake assembly, such as Figure 2 , Figure 3 and Figure 6 shown: It includes a forward rotation control unit, a reverse rotation control unit, and a shuttle valve 3 respectively connected to the forward rotation control unit and the reverse rotation control unit. The forward rotation control unit includes an oil port A1, a first balance valve 1, and an oil port A arranged in sequence along the hydraulic oil flow direction. The reverse rotation control unit includes an oil port B1, a second balance valve 2, and an oil port B arranged in sequence along the hydraulic oil flow direction. The oil port A and the oil port B are respectively connected to the motor end. The shuttle valve 3 is connected to the oil port C. Both the first balance valve 1 and the second balance valve 2 are set with a safety pressure;
[0037] The brake parking assembly is as Figure 5 shown: It includes a first one-way valve 4 connected to the forward rotation control unit and a second one-way valve 5 connected to the reverse rotation control unit. A first throttle valve 8 and a second throttle valve 9 are respectively arranged on the first one-way valve 4 and the second one-way valve 5;
[0038] The safety protection assembly is as Figure 4 shown: It includes a first overflow valve 6 connected to the forward rotation control unit and a second overflow valve 7 connected to the reverse rotation control unit.
[0039] The allowable working ambient temperature of the valve group is -20°C - 90°C, and the working oil temperature of the valve group is -30°C - 90°C.
[0040] The oil port A and the oil port B are blocked with iron plugs, and the other oil ports are blocked with plastic plugs.
[0041] This valve group is supplied with oil from the hydraulic source through oil ports A1 and B1. At the same time, the forward and reverse rotations of the motor are controlled through oil ports A and B connected to the motor end. Each branch contains a first balance valve 1 or a second balance valve 2. The one-way parts of these two balance valves allow the oil to flow freely from oil port A1 to oil port A and from oil port B1 to oil port B. When the oil flows from oil port A1 to oil port A, a part of it will flow as pilot oil through the circuit to the control port of the first balance valve 1, thereby opening the first balance valve 1 and causing the motor to rotate forward. When the oil flows from oil port B1 to oil port B, a part of it will flow as pilot oil through the circuit to the control port of the second balance valve 2, thereby opening the second balance valve 2 and causing the motor to rotate in reverse. In the reverse direction, it can prevent the oil from flowing from oil port A to oil port A1 and from oil port B to oil port B1, so as to ensure that the winch can reliably stop at the required position. At the same time, during the above operation process, due to the existence of the first check valve 4 and the second check valve 5, when a part of the oil ports A and B is used as pilot control oil and enters the first balance valve 1 and the second balance valve through the circuit, a part of it will be drained through the first throttle valve 8, the second throttle valve 9, the first check valve 4 and the second check valve 5. The first throttle valve 8 and the second throttle valve 9 limit the drained flow rate to prevent insufficient flow rate to open the first balance valve 1 and the second balance valve 2. At the same time, no matter whether the oil enters the motor from oil port A1 or oil port B1, a part of the oil will enter the shuttle valve 3, and then the shuttle valve 3 will release the brake device through oil port C, so that the motor can operate as required. The paired first relief valve 6 and second relief valve 7 can control the input pressure during equipment startup and the output pressure when the motor stops. When pressure spikes and pressure fluctuations occur, the first relief valve 6 and the second relief valve 7 can quickly open and discharge a part of the oil through the pressureless circuit. That is, if the oil flows from oil port A to oil port A1 or from oil port A1 to oil port A, the oil will be discharged into the circuit of oil port B, and vice versa. At the same time, in order to prevent the motor from being damaged due to pressure buildup under any circumstances, the first balance valve 1 and the second balance valve 2 will set a safety pressure. This setting will cause unloading when the motor pressure exceeds the set pressure to protect the system components from being damaged.
[0042] The above description of the embodiments is to enable those of ordinary skill in the art to understand and use the invention. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative labor. Therefore, the present invention is not limited to the above embodiments, and the improvements and modifications made by those skilled in the art without departing from the scope of the present invention according to the disclosure of the present invention should be within the protection scope of the present invention.
Claims
1. A winch parking brake valve group, characterized in that Comprising: Release brake assembly: including a forward rotation control unit, a reverse rotation control unit, and a shuttle valve (3) respectively connecting the forward rotation control unit and the reverse rotation control unit; Brake stop assembly: including a first check valve (4) connecting the forward rotation control unit and a second check valve (5) connecting the reverse rotation control unit; Safety protection assembly: including a first relief valve (6) connecting the forward rotation control unit and a second relief valve (7) connecting the reverse rotation control unit; The forward rotation control unit includes an oil port A1, a first balance valve (1), and an oil port A arranged in sequence along the direction of hydraulic oil flow; The reverse rotation control unit includes an oil port B1, a second balance valve (2), and an oil port B arranged in sequence along the direction of hydraulic oil flow; The oil port A and the oil port B are respectively connected to the motor end; A first throttle valve (8) and a second throttle valve (9) are respectively arranged on the first check valve (4) and the second check valve (5); The first throttle valve (8) and the second throttle valve (9) are used to limit the discharged flow rate to prevent insufficient flow rate to open the first balance valve (1) and the second balance valve (2).
2. The winch parking brake valve group according to claim 1, characterized in that, The shuttle valve (3) is connected to the oil port C.
3. The winch parking brake valve group according to claim 1, characterized in that, Safety pressures are set for both the first balance valve (1) and the second balance valve (2).
4. The winch parking brake valve group according to claim 1, wherein, The allowable working ambient temperature of the valve group is -20°C - 90°C.
5. A winch parking brake valve group according to claim 1, characterized in that, The working oil temperature of the valve group is -30°C - 90°C.
6. The winch parking brake valve group according to claim 1, characterized in that, The oil port A and the oil port B are blocked with iron plugs, and the other oil ports are blocked with plastic plugs.
Citation Information
Patent Citations
Hydraulic system and engineering machinery
CN108869432A
Winch parking brake valve set
CN210764105U