A wood grabber hydraulic system and an engineering machine

Abstract

The utility model relates to excavator hydraulic system field, concretely relates to a kind of grab wood ware hydraulic system and engineering machinery.It includes rotary motor, for the brake mechanism of the rotary motor is braked, for the control grab wood ware pawl opening and closing of grabber opening and closing oil cylinder, high-pressure oil source and control valve group;The utility model when rotary motor needs to start, the first working oil port or second working oil port pressure of electric proportional reversing valve rises, high pressure can be passed through shuttle valve and be transmitted to brake mechanism, to drive the brake mechanism away from rotary motor to release brake, to ensure that when rotary motor has starting torque, brake mechanism can timely release brake for rotary motor, ensure that motor starts without delay, reduce the power loss of mechanical brake.

Description

Technical Field

[0001] This utility model relates to the field of excavator hydraulic systems, specifically to a log grabber hydraulic system and engineering machinery. Background Technology

[0002] Log grapples have a wide range of applications in forestry construction. In addition to the traditional work of grabbing logs, some users will use log grapples to pry objects, so a braking system needs to be installed on the log grapple motor.

[0003] Existing technology uses a motor with a mechanical brake to achieve rotational braking of the log grapple, and a separate hydraulic line is drawn from the excavator to release the motor brake of the log grapple. However, this solution suffers from excessively long pipelines between the machine and the log grapple, resulting in slow pilot oil pressure build-up. Consequently, the motor may begin to rotate, but the mechanical brake has not yet been released, leading to a delay in motor startup and impacting practical use. Utility Model Content

[0004] The purpose of this utility model is to provide a hydraulic system for a log grabber and engineering machinery, which integrates the brake release oil circuit of the rotary motor with the main oil circuit of the rotary motor and the grabber opening and closing cylinder, thus solving the problem of motor start-up delay caused by slow pressure build-up of the pilot oil.

[0005] In a first aspect, this utility model provides a hydraulic system for a log gripper, comprising a rotary motor, a braking mechanism for braking the rotary motor, a gripper opening and closing cylinder for controlling the opening and closing of the log gripper's claws, a high-pressure oil source, and a control valve assembly; the control valve assembly includes: The high-pressure oil output from the high-pressure oil source can be supplied to the gripper opening and closing cylinder through the electromagnetic reversing valve. The electro-proportional directional valve has an inlet port connected to a high-pressure oil source and an outlet port connected to an oil tank. The first working port and the second working port are respectively connected to the forward and reverse ports of the rotary motor. The shuttle valve has a first oil inlet and a second oil inlet connected to the first working oil port and the second working oil port of the electro-proportional directional valve, respectively. The shuttle valve is used to output hydraulic oil from its outlet when the rotary motor needs to be released from braking, so as to drive the braking mechanism away from the rotary motor to release the braking.

[0006] Optionally, the oil inlet of the electromagnetic reversing valve is connected to the high-pressure oil source, the oil return port is connected to the oil tank, and the first working oil port and the second working oil port are respectively connected to the rod-side chamber and the rodless chamber of the gripper opening and closing cylinder. When the solenoid directional valve is in the neutral position, the oil inlet of the solenoid directional valve is closed. When the solenoid directional valve is in the left position, the oil inlet and the second working oil port of the solenoid directional valve are connected, and the first working oil port and the return oil port are connected. When the electromagnetic directional valve is in the right position, the oil inlet of the electromagnetic directional valve is connected to the first working oil port, and the second working oil port is connected to the return oil port.

[0007] Optionally, it also includes: The first pressure reducing valve is located between the high-pressure oil source and the electro-proportional directional valve and downstream of the solenoid directional valve.

[0008] Optionally, it also includes: A hydraulically controlled directional valve is located between the shuttle valve and the braking mechanism; The inlet of the hydraulic directional valve is connected to the outlet of the shuttle valve, the return port is connected to the oil tank, and the outlet is connected to the braking mechanism; when the hydraulic directional valve is in the upper position, the inlet and outlet are connected; when the hydraulic directional valve is in the lower position, the outlet and return port are connected. When the oil outlet pressure of the shuttle valve is higher than the set value, the hydraulic control directional valve switches to the upper position, and the oil outlet of the shuttle valve can output hydraulic oil to drive the braking mechanism away from the rotary motor to release the brake.

[0009] Optionally, it also includes: The second pressure reducing valve is located between the oil outlet of the shuttle valve and the oil inlet of the hydraulic directional valve.

[0010] Optionally, the braking mechanism includes: spring, A locking element, under the action of the spring, tends to press against the rotary motor to perform braking; The outlet of the shuttle valve can output hydraulic oil to drive the locking element to overcome the spring action and move away from the rotary motor to release the brake.

[0011] Optionally, it also includes: The first oil replenishment check valve has its outlet end connected between the forward rotation port of the rotary motor and the first working port of the electro-proportional directional valve, and its inlet end connected to the oil tank. The second oil replenishment check valve has its outlet end connected between the reverse oil port of the rotary motor and the second working oil port of the electro-proportional directional valve, and its inlet end connected to the oil tank.

[0012] Optionally, it also includes: The first safety valve has its inlet end connected to the forward rotation port of the rotary motor, and its outlet end connected to the second working port of the electro-proportional directional valve.

[0013] Optionally, it also includes: The second safety valve has its inlet end connected to the reverse oil port of the rotary motor, and its outlet end connected to the first working oil port of the electro-proportional directional valve.

[0014] Secondly, this utility model provides an engineering machinery, which includes the aforementioned log grabber hydraulic system.

[0015] Compared with the prior art, the present invention has the following beneficial effects: When the rotary motor needs to be started, the pressure at the first or second working port of the electro-proportional directional valve increases. The high pressure can be transmitted to the braking mechanism through the shuttle valve to drive the braking mechanism away from the rotary motor to release the brake. This ensures that when the rotary motor has starting torque, the braking mechanism can release the brake on the rotary motor in time, ensuring that the motor starts without delay and reducing the power loss of mechanical braking. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a hydraulic system for a log grabber provided in an embodiment of the present invention.

[0017] Numbering on the map: 1. Rotary motor; 2. Braking mechanism; 3. Grip opening and closing cylinder; 4. Control valve group; 41. Solenoid directional valve; 42. Electro-proportional directional valve; 43. Shuttle valve; 44. First pressure reducing valve; 45. Hydraulic directional valve; 46. Second pressure reducing valve; 5. First replenishing check valve; 6. Second replenishing check valve; 7. First safety valve; 8. Second safety valve. Detailed Implementation

[0018] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more. In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0019] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0020] To make the purpose, technical solution and advantages of this utility model patent clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0021] Combination Figure 1 This embodiment provides a hydraulic system for a log gripper, which includes a rotary motor 1, a braking mechanism 2 for braking the rotary motor 1, a gripper opening and closing cylinder 3 for controlling the opening and closing of the gripper claw, a high-pressure oil source, and a control valve group 4. The control valve group includes an electromagnetic directional valve 41, an electro-proportional directional valve 42, and a shuttle valve 43. The high-pressure oil output from the high-pressure oil source can be supplied to the gripper opening and closing cylinder 3 through the electromagnetic directional valve 41. The inlet of the electro-proportional directional valve 42 is connected to the high-pressure oil source, the return port is connected to the oil tank, and the first working port and the second working port are respectively connected to the forward and reverse rotation ports of the rotary motor 1. The first inlet and the second inlet of the shuttle valve 43 are respectively connected to the first working port and the second working port of the electro-proportional directional valve 42. The shuttle valve 43 is used to output hydraulic oil from its outlet to drive the braking mechanism 2 away from the rotary motor 1 to release the brake when the rotary motor 1 needs to be released from braking.

[0022] The inlet of the electromagnetic directional valve 41 is connected to the high-pressure oil source, and the return port is connected to the oil tank. The first working port and the second working port are respectively connected to the rod-side chamber and the rodless chamber of the gripper opening and closing cylinder 3. When the electromagnetic directional valve 41 is in the neutral position, the inlet of the electromagnetic directional valve 41 is cut off. When the electromagnetic directional valve 41 is in the left position, the inlet and the second working port of the electromagnetic directional valve 41 are connected, and the first working port and the return port are connected. When the electromagnetic directional valve 41 is in the right position, the inlet and the first working port of the electromagnetic directional valve 41 are connected, and the second working port and the return port are connected.

[0023] A first pressure reducing valve 44 is provided between the high-pressure oil source and the electro-proportional directional valve 42 for pressure reduction to protect the system safety. The first pressure reducing valve 44 is located downstream of the electromagnetic directional valve 41.

[0024] A hydraulically controlled directional valve 45 is provided between the shuttle valve 43 and the braking mechanism 2. The inlet of the hydraulically controlled directional valve 45 is connected to the outlet of the shuttle valve 43, the return port is connected to the oil tank, and the outlet is connected to the braking mechanism 2. When the hydraulically controlled directional valve 45 is in the upper position, the inlet and outlet are connected. When the hydraulically controlled directional valve 45 is in the lower position, the outlet and return port are connected. When the outlet pressure of the shuttle valve 43 (which is the same as the higher of the forward and reverse oil ports of the rotary motor) is higher than a set value, it can drive the hydraulically controlled directional valve 45 to switch to the upper position. The outlet of the shuttle valve 43 can output hydraulic oil to drive the braking mechanism 2 away from the rotary motor 1 to release the brake. A second pressure reducing valve is provided between the outlet of the shuttle valve 43 and the inlet of the hydraulically controlled directional valve 45 for pressure reduction to protect the system safety.

[0025] In one specific embodiment, the braking mechanism 2 includes a spring and a locking element, which, under the action of the spring, tends to press against the rotary motor 1 to perform braking; the outlet of the shuttle valve 43 can output hydraulic oil to drive the locking element away from the rotary motor 1 to overcome the action of the spring and release the brake.

[0026] In addition, the hydraulic system of the log grappling hook also includes a first replenishing check valve 5 and a second replenishing check valve 6 for preventing the rotary motor 1 from sucking in air. The oil outlet of the first replenishing check valve 5 is connected between the forward rotation port of the rotary motor 1 and the first working port of the electro-proportional directional valve 42, and the oil inlet is connected to the oil tank. The oil outlet of the second replenishing check valve 6 is connected between the reverse rotation port of the rotary motor 1 and the second working port of the electro-proportional directional valve 42, and the oil inlet is connected to the oil tank.

[0027] The log grappling hydraulic system also includes a first safety valve 7 and a second safety valve 8 for overflow when the pressure at the forward and reverse ports of the rotary motor 1 is too high; the inlet of the first safety valve 7 is connected to the forward port of the rotary motor 1, and the outlet is connected to the second working port of the electro-proportional directional valve 42. The inlet of the second safety valve 8 is connected to the reverse port of the rotary motor 1, and the outlet is connected to the first working port of the electro-proportional directional valve 42.

[0028] The working principle is explained in the attached diagram. Figure 1As shown, the control valve group 4 introduces the high-pressure oil output from the whole machine (high-pressure oil source) into the P port of the control valve group 4, and then divides it into two paths. One path can be output from the A1 port (connected to the first working oil port of the solenoid directional valve 41) and the B1 port (connected to the second working oil port of the solenoid directional valve 41) of the control valve group 4 to the gripper opening and closing cylinder 3, which is used to control the opening and closing of the gripper claw. The other path is output from the A2 port (connected to the first working oil port of the electro-proportional directional valve 42) and the B2 port (connected to the second working oil port of the electro-proportional directional valve 42) of the control valve group 4 to the rotary motor 1. Then, a shuttle valve 43 is used to lead out the highest pressure in the A2 port and the B2 port, and output it to the BR port (connected to the braking mechanism 2) of the control valve group 4 after passing through the second pressure reducing valve 46 and the hydraulic control directional valve 45 to unlock the mechanical brake. When the rotary motor 1 needs to rotate, the electro-proportional directional valve 42 adjusts its opening according to the control current. Pressure builds up at port A2 (or B2), and the rotary motor 1 generates counter-clockwise (or clockwise) rotational torque. If a traditional independent oil supply and unlocking braking scheme is used, the long pilot line will cause the oil pressure to build up too slowly, preventing the mechanical brake of the braking mechanism 2 from being released in time. This results in a delay in the machine's rotation and reduced work efficiency. Furthermore, prolonged operation under these conditions will cause irreversible damage to the mechanical braking mechanism of the rotary motor 1, reducing its service life. In the hydraulic system of this embodiment, the control valve group 4 integrates the A2 port, B2 port, and brake unlocking circuit for supplying oil to the rotary motor 1 into one unit. Its main advantage is that when the rotary motor 1 needs to be started, the pressure of the A2 port or B2 port increases. The high pressure is transmitted to the BR port (connected to the braking mechanism) of the control valve group 4 after passing through the shuttle valve 43, the second pressure reducing valve 46, and the hydraulic control directional valve 45. This makes the pressure of the BR port rise synchronously with that of the A2 port or B2 port of the control valve group 4, thereby ensuring that when the rotary motor 1 has starting torque, the pilot circuit can unlock the braking mechanism 2 of the rotary motor 1 in time, ensuring that the rotary motor starts without delay and reducing the power loss of mechanical braking.

[0029] In another specific embodiment, an engineering machine is provided, which includes the aforementioned log grabber hydraulic system.

[0030] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A hydraulic system for a log grabber, characterized in that, It includes a rotary motor (1), a braking mechanism (2) for braking the rotary motor (1), a gripper opening and closing cylinder (3) for controlling the opening and closing of the gripper claw, a high-pressure oil source, and a control valve assembly (4); the control valve assembly (4) includes: Electromagnetic reversing valve (41): The high-pressure oil output from the high-pressure oil source can be supplied to the gripper opening and closing cylinder (3) through the electromagnetic reversing valve (41). The electric proportional directional valve (42) has an inlet port connected to a high-pressure oil source and an outlet port connected to an oil tank. The first working oil port and the second working oil port are respectively connected to the forward and reverse oil ports of the rotary motor (1). The shuttle valve (43) has a first oil inlet and a second oil inlet connected to the first working oil port and the second working oil port of the electro-proportional directional valve (42), respectively. When the rotary motor (1) is started, the shuttle valve (43) can output hydraulic oil from its outlet to drive the braking mechanism (2) away from the rotary motor (1) to release the brake.

2. The log gripper hydraulic system according to claim 1, characterized in that, The inlet of the electromagnetic reversing valve (41) is connected to the high-pressure oil source, the return port is connected to the oil tank, and the first working port and the second working port are respectively connected to the rod chamber and the rodless chamber of the gripper opening and closing cylinder (3). When the electromagnetic reversing valve (41) is in the neutral position, the oil inlet of the electromagnetic reversing valve (41) is closed. When the electromagnetic reversing valve (41) is in the left position, the oil inlet and the second working oil port of the electromagnetic reversing valve (41) are connected, and the first working oil port and the return oil port are connected. When the electromagnetic reversing valve (41) is in the right position, the oil inlet of the electromagnetic reversing valve (41) is connected to the first working oil port, and the second working oil port is connected to the return oil port.

3. The log gripper hydraulic system according to claim 1, characterized in that, Also includes: The first pressure reducing valve (44) is located between the high-pressure oil source and the electro-proportional directional valve (42) and downstream of the electromagnetic directional valve (41).

4. The log gripper hydraulic system according to claim 1, characterized in that, Also includes: A hydraulically controlled directional valve (45) is located between the shuttle valve (43) and the braking mechanism (2); The oil inlet of the hydraulic directional valve (45) is connected to the oil outlet of the shuttle valve (43), the oil return port is connected to the oil tank, and the oil outlet is connected to the braking mechanism (2); when the hydraulic directional valve (45) is in the upper position, the oil inlet and the oil outlet are connected; when the hydraulic directional valve (45) is in the lower position, the oil outlet and the oil return port are connected. When the oil outlet pressure of the shuttle valve (43) is higher than the set value, it can drive the hydraulic control directional valve (45) to switch to the upper position. The oil outlet of the shuttle valve (43) can output hydraulic oil to drive the braking mechanism (2) away from the rotary motor (1) to release the brake.

5. The log gripper hydraulic system according to claim 4, characterized in that, Also includes: The second pressure reducing valve (46) is located between the oil outlet of the shuttle valve (43) and the oil inlet of the hydraulic directional valve (45).

6. The log gripper hydraulic system according to claim 1, characterized in that, The braking mechanism (2) includes: spring, The locking element, under the action of the spring, tends to press against the rotary motor (1) to perform braking; The outlet of the shuttle valve (43) can output hydraulic oil to drive the locking element away from the rotary motor (1) to release the brake, thus overcoming the spring action.

7. The log gripper hydraulic system according to claim 1, characterized in that, Also includes: The first oil replenishment check valve (5) has its oil outlet end connected between the forward oil port of the rotary motor (1) and the first working oil port of the electro-proportional directional valve (42), and its oil inlet end connected to the oil tank. The second oil replenishment check valve (6) has its oil outlet end connected between the reverse oil port of the rotary motor (1) and the second working oil port of the electro-proportional directional valve (42), and its oil inlet end connected to the oil tank.

8. The log gripper hydraulic system according to claim 1, characterized in that, Also includes: The first safety valve (7) has its inlet end connected to the forward oil port of the rotary motor (1) and its outlet end connected to the second working oil port of the electro-proportional directional valve (42).

9. The log gripper hydraulic system according to claim 1, characterized in that, Also includes: The second safety valve (8) has its inlet end connected to the reverse oil port of the rotary motor (1) and its outlet end connected to the first working oil port of the electro-proportional directional valve (42).

10. An engineering machinery, characterized in that, Includes the log gripper hydraulic system as described in any one of claims 1-9.

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