Opening and closing semi-electric control system of log grapple for forestry machine

Abstract

The utility model relates to the technical field of log grapple control, in particular to a semi-electric control operation system for opening and closing actions of log grapplers, which comprises a handle, a low-pressure sensor valve group, a controller, an electromagnetic valve group and a main valve. Different electric signals and hydraulic pilot signals are input through the handle, so that different signals are combined and output to all accessory pipelines, the log grapple is controlled to complete opening and closing actions, and the smoothness and simplicity of handle operation are effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to wood grabber control technical field, especially relates to a forestry machine wood grabber opening and closing half electric control system. BACKGROUND

[0002] The difference between the wood grabber for forestry and the ordinary excavator lies in the difference of the front end working device, the boom arm of the wood grabber is longer than that of the ordinary excavator, the boom arm front end is assembled with a pair of arms for installing the wood grabber, which replaces the traditional shovel.

[0003] The prior art mainly controls the wood grabber handle by hydraulic control, but in cold seasons or regions, the problem of slow valve core opening speed and efficiency decline caused by large loss of pilot oil pressure due to low viscosity of hydraulic oil after the wood grabber starts is existed. However, if the pilot pressure is increased for the sake of the valve core opening speed, the pilot pressure range will be larger, and the smoothness of the handle operation stroke will be reduced. Therefore, a control system for solving the smoothness problem of the wood grabber handle operation is needed. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at providing a wood grabber operation system, the wood grabber opening and closing is proportional control, the hydraulic control of opening and closing is designed as half electric control, the main valve reversing valve core is indirectly reversed by the electromagnetic valve pilot oil pressure, instead of the direct action of the handle pilot secondary pressure oil on the main valve core, and the smoothness of operation is ensured.

[0005] To achieve the above-mentioned purpose, one or more embodiments of the present disclosure provide a forestry machine wood grabber opening and closing half electric control system, which comprises a handle, a low pressure sensor valve group, a controller, an electromagnetic valve group and a main valve. The first oil port and the third oil port of the handle are respectively connected to two different interfaces of the low pressure sensor valve group. The low pressure sensor on the low pressure sensor valve group is connected to the controller, and the controller is also connected to the electromagnetic valve group. The controller outputs proportional current to the electromagnetic valve. The electromagnetic valve is energized to open. The electromagnetic valve group is connected to the main valve, and the pilot oil flows from the electromagnetic valve port to the main valve port.

[0006] Further, the controller is a REXROTH RC10-10 type controller.

[0007] Further, the S7 port of the low pressure sensor valve group is connected to a first low pressure sensor, and the first low pressure sensor wire harness is respectively connected to the controller 22 pin, the controller 56 pin and the controller 45 pin.

[0008] Further, the S6 port of the low pressure sensor valve group is connected to a second low pressure sensor, and the second low pressure sensor wire harness is respectively connected to the controller 22 pin, the controller 56 pin and the controller 46 pin.

[0009] Further, the controller 22 pin provides 5V constant voltage, the controller 56 pin is sensor analog ground, the controller 45 pin receives the wood grabber closing pilot pressure signal, and the controller 46 pin receives the wood grabber opening pilot pressure signal.

[0010] Further, the first electromagnetic valve group A6 is connected to the controller 35 pin, and the second electromagnetic valve group A5 is connected to the controller 36 pin.

[0011] Further, the controller 35 pin receives the wood grabber closing electromagnetic valve signal, and the controller 36 pin receives the wood grabber opening electromagnetic valve signal.

[0012] Further, the first electromagnetic valve group A6 is connected to the XBk port of the main valve P1 valve through a pilot line, and the second electromagnetic valve group A5 is connected to the XAk port of the main valve P1 valve through a pilot line.

[0013] Further, the main valve is a multi-way reversing valve group, wherein the BUCKET valve is used as a wood grabber opening and closing reversing valve.

[0014] Further, the Bk port and the Ak port of the main valve are respectively connected to the inlet and return ports of the wood grabber opening and closing oil cylinder.

[0015] The beneficial effects of one or more technical solutions above are as follows:

[0016] The wood grabber is indirectly pushed by the electromagnetic valve pilot oil pressure to drive the main valve reversing valve spool to reverse through the cooperation of the handle and the controller, the low-pressure sensor valve group, the electromagnetic valve group and the main valve, instead of the direct action of the handle pilot secondary pressure oil on the main valve spool, so that the smoothness of the action is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0017] In the drawings, the size and proportion do not represent the actual size and proportion of the product. The drawings are merely illustrative, and some unnecessary elements or features are omitted for the sake of clarity.

[0018] Figure 1 It is a handle structure schematic view of the utility model.

[0019] Figure 2 It is a handle hydraulic principle view of the utility model.

[0020] Figure 3 It is a low-pressure sensor valve group structure schematic view of the utility model.

[0021] Figure 4 It is a low-pressure sensor valve group hydraulic principle view of the utility model.

[0022] Figure 5 It is a controller electrical principle view of the utility model.

[0023] Figure 6 The controller electrical schematic diagram of the utility model.

[0024] Figure 7 The electromagnetic valve group structure schematic diagram of the utility model.

[0025] Figure 8 The electromagnetic valve group hydraulic principle diagram of the utility model.

[0026] Figure 9 The main valve hydraulic principle diagram of the utility model.

[0027] Figure 10 The control curve of the first and third oil ports of the handle of the utility model.

[0028] Figure 11 The current and pilot pressure control curve of the electromagnetic valve of the utility model. DETAILED DESCRIPTION

[0029] The utility model will be further described below in combination with the drawings and embodiments.

[0030] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the utility model. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the utility model belongs.

[0031] It should be noted that the terms used herein are only for describing the specific embodiments and are not intended to limit the exemplary embodiments according to the utility model. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form, and furthermore, it should be understood that when the terms "comprise" and / or "include" are used in the specification, they indicate the presence of a feature, step, operation, device, component and / or their combination.

[0032] In the utility model, the orientation or position relationship indicated by the terms such as "upper", "lower", "lateral", "bottom" and the like is the orientation or position relationship shown in the drawings, which is only a relationship word determined for the convenience of describing the structural relationship of components or elements of the utility model, and is not a specific component or element in the utility model, and cannot be understood as a limitation on the utility model.

[0033] In the utility model, the terms such as "connection" should be understood broadly, which means that it can be fixedly connected, integrally connected or detachably connected; it can be directly connected or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the utility model can be determined according to the specific circumstances, and it cannot be understood as a limitation on the utility model.

[0034] In the case of no conflict, the embodiments in the utility model and the features in the embodiments can be combined with each other.

[0035] A closing operation system of a multifunctional handle for a wood grabber, characterized by comprising a handle, a low-pressure sensor valve group, a controller, an electromagnetic valve group and a main valve.

[0036] The handle and oil port position schematic view is shown in Figure 1 The handle is provided with four oil ports, wherein the first oil port (left swing of the handle) and the third oil port (right swing of the handle) control the closing and opening of the wood grabber respectively, and the first oil port and the third oil port of the handle are connected with the low-pressure sensor valve group interface.

[0037] The low-pressure sensor valve group structure schematic view and the hydraulic principle are shown in Figure 3 、 Figure 4 The low-pressure sensor valve group is a shuttle valve group provided with one shuttle valve, wherein the low-pressure sensor valve group BI port pipeline is connected with the first oil port of the handle, the low-pressure sensor valve group BO port pipeline is connected with the third oil port of the handle, and the low-pressure sensor valve group S7 port is connected with the first low-pressure sensor. Figure 5 、 Figure 6 The controller circuit is shown in Figure 5 、 Figure 6 The controller is a RC10-10 model controller of Rikoh, the first low-pressure sensor wire harness is connected with the controller 22 pin, the controller 56 pin and the controller 45 pin respectively, the low-pressure sensor valve group S6 port is connected with the second low-pressure sensor, and the second low-pressure sensor is connected with the controller 22 pin, the controller 56 pin and the controller 46 pin through a wire harness respectively. The controller 22 pin provides 5V constant voltage for the sensor, the controller 56 pin is the sensor analog ground, the controller 45 pin receives the closing pilot pressure of the wood grabber, and the controller 46 pin receives the opening pilot pressure of the wood grabber.

[0038] The controller is connected with the electromagnetic valve in addition to the above low-pressure sensor. The controller 35 pin receives the closing electromagnetic valve signal of the wood grabber and is connected with the first electromagnetic valve group A6 joint, and the controller 36 pin receives the opening electromagnetic valve signal of the wood grabber and is connected with the second electromagnetic valve group A5 joint. Figure 7 、 Figure 8 The electromagnetic valve structure and the hydraulic principle are shown in Figure 7 、 Figure 8 .

[0039] The electromagnetic valve is connected with the main valve in addition to the controller, and the first electromagnetic valve group A6 joint pilot pipeline is connected with the main valve P1 valve XBk port, and the second electromagnetic valve group A5 joint pilot pipeline is connected with the main valve P1 valve XAk port. Figure 9As shown, the main valve is a multi-way directional valve group, wherein the bucket valve is used as the opening and closing directional valve of the grabber, the XBk port of the bucket valve P1 of the main valve is connected to the first electromagnetic valve group A6, the XAk port of the bucket valve P1 of the main valve is connected to the second electromagnetic valve group A5, and Bk and Ak are respectively connected to the inlet and return ports of the grabber opening and closing oil cylinder.

[0040] Further, when the handle is swung to the left, the grabber is closed, and the specific logic is as follows: the pilot oil of the handle flows to the BI port on the low-pressure sensor valve group through the first oil port, at this time, the first low-pressure sensor on the S7 port of the low-pressure sensor valve group is stressed, the first low-pressure sensor inputs the grabber closing pilot pressure signal to the terminal of the controller 45, at this time, the grabber closing electromagnetic valve signal of the terminal 35 of the controller responds, the controller outputs proportional current to the first electromagnetic valve group A6, the electromagnetic valve of the A6 group is energized to open, the A6 group pilot oil flows to the XBk port of the main valve P1 through the A6 port to push the main valve P1 bucket valve to change direction, the high-pressure oil of the main valve flows from the Bk port to the Ak port and then flows out, at this time, the grabber is closed.

[0041] Further, when the handle is swung to the right, the grabber is opened, and the specific logic is as follows: the pilot oil of the handle flows to the BO port on the low-pressure sensor valve group through the third oil port, at this time, the second low-pressure sensor on the S6 port of the low-pressure sensor valve group is stressed, the second low-pressure sensor inputs the grabber opening pilot pressure signal to the terminal of the controller 46, at this time, the grabber opening electromagnetic valve signal of the terminal 36 of the controller responds, the controller outputs proportional current to the second electromagnetic valve group A5, the electromagnetic valve of the A5 group is energized to open, the A5 group pilot oil flows to the XAk port of the main valve P1 through the A5 port to push the main valve P1 bucket valve to change direction, the high-pressure oil of the main valve flows from the Ak port to the Bk port and then flows out, at this time, the grabber is opened; wherein the proportional current provided by the controller can be any current value, the electromagnet on the electromagnetic valve converts the current into mechanical force acting on the electromagnetic valve spool to overcome the return spring, as the current increases, the return spring is compressed, and the spool moves.

[0042] Further, as shown in Figure 10 The pilot secondary pressure of the handle is in the range of 0.64-2.26 MPa, and the pilot primary pressure and the pilot secondary pressure are conducted after the handle is pushed to the maximum stroke, the pressure jumps to 3.5 MPa in an instant, that is, the pilot secondary pressure range of the handle is 0.64-2.26 MPa and 3.5 MPa, and the upper limit pressure of 2.26 MPa in the range under the hydraulic control condition directly pushes the main valve spool (the pushing pressure of the main valve spool in the fully open state is about 2.3 MPa), considering the pressure loss environment, this pressure causes the action speed to decrease, and there is no transition between 2.26 MPa and 3.5 MPa, that is, there is no stepless pressure change, and the instantaneous step change of the pressure causes the action smoothness to decrease.

[0043] Further, as shown in Figure 11 The handle pilot secondary pressure interval 0.64~3.5MPa is converted into voltage signal by low pressure sensor and fed back to the input end of the controller, the output end of the controller outputs the current range value of 550~850mA to the electromagnetic valve, the current of 550~850mA of the electromagnetic valve energizes the coil to generate 2~4MPa of electromagnetic valve pilot oil pressure, so that the main valve reversing valve spool is indirectly pushed by the electromagnetic valve pilot oil pressure, instead of the handle pilot secondary pressure oil directly acting on the main valve spool, the upper limit value of the pilot pressure interval is increased by the controller to amplify the current, the speed efficiency under the pressure loss environment is maintained, and the pilot pressure interval is reduced by the controller to reduce the current range, and the smoothness of the action is ensured.

[0044] The protection scope of the utility model is only limited by the claims. Thanks to the teaching of the utility model, the person skilled in the art can easily recognize that the alternative structure of the disclosed structure of the utility model can be used as a feasible alternative embodiment, and the disclosed embodiments of the utility model can be combined to produce new embodiments, which also fall within the scope of the appended claims.

Claims

1. A forestry machine wood grabber opening and closing semi-electronic control system, characterized by, It comprises: handle, low pressure sensor valve group, controller, solenoid valve group, main valve; wherein the handle first oil port, third oil port is connected with low pressure sensor valve group two different interfaces respectively; low pressure sensor on low pressure sensor valve group is connected with controller, controller is also connected with solenoid valve group, controller output end sends proportional current to solenoid valve, solenoid valve is powered on, solenoid valve group is connected with main valve, pilot oil flows from solenoid valve port to main valve port.

2. The forestry machine wood grabber opening and closing semi-electronic control system according to claim 1, characterized in that, The controller is RC10-10 model controller of Rikuo.

3. The forestry machine wood grabber opening and closing semi-electronic control system of claim 1 wherein, The low pressure sensor valve group (S7) port is connected with first low pressure sensor, and the first low pressure sensor wire harness is connected with controller 22 pin, controller 56 pin and controller 45 pin respectively.

4. The forestry machine wood grabber opening and closing semi-electronic control system of claim 2 wherein, The low pressure sensor valve group (S6) port is connected with second low pressure sensor, and the second low pressure sensor wire harness is connected with controller 22 pin, controller 56 pin and controller 46 pin respectively.

5. The forestry machine half-electronic wood grabber opening and closing system according to claim 3 or claim 4, characterized in that, The controller 22 pin provides 5V constant voltage, the controller 56 pin is sensor analog ground, the controller 45 pin receives grabber closing pilot pressure signal, and the controller 46 pin receives grabber opening pilot pressure signal.

6. The forestry machine wood grabber opening and closing semi-electronic control system of claim 1 wherein, The first solenoid valve group (A6) is connected with controller 35 pin, and the second solenoid valve group (A5) is connected with controller 36 pin.

7. The forestry machine wood grabber opening and closing semi-electronic control system of claim 6 wherein, The controller 35 pin receives grabber closing solenoid valve signal, and the controller 36 pin receives grabber opening solenoid valve signal.

8. The forestry machine wood grabber opening and closing semi-electronic control system of claim 1 wherein, The first solenoid valve group (A6) is connected with main valve P1 valve XBk port through pilot line, and the second solenoid valve group (A5) is connected with main valve P1 valve XAk port through pilot line.

9. The forestry machine wood grabber opening and closing semi-electronic control system of claim 1 wherein, The main valve is a multi-way reversing valve group, wherein BUCKET valve is used as grabber opening and closing reversing valve.

10. The half-electronic opening and closing system of the wood grabber for the forestry machine according to claim 1, characterized in that, The main valve Bk port and Ak port are connected with the inlet and return ports of grabber opening and closing oil cylinder respectively.

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