Sawing operation control system of feller and feller

Abstract

The invention discloses a feller sawing operation control system and a feller. The system comprises a controller, a saw motor, a saw plate oil cylinder, a saw plate and chain saw assembly, a first pressure sensor for detecting the loop pressure of the saw plate oil cylinder and a second pressure sensor for detecting the loop load pressure of the saw motor. The controller stores pressure standard values of saw cutting start, saw cutting completion and saw plate return completion; the controller is configured as follows: when saw cutting is started, the saw motor is controlled to rotate at a standard speed, and the saw plate and the chain saw assembly move towards the tree; when the detection value of the second pressure sensor exceeds the pressure standard value at the beginning of saw cutting, the saw motor is switched to rotate at a high speed; when the detection value of the second pressure sensor is reduced to the standard value of the sawing completion pressure, the saw motor is controlled to stop, and the saw plate and the chain saw assembly are reset; and when the detection value of the first pressure sensor is equal to the pressure standard value for completing returning of the saw plate, the saw plate oil cylinder is controlled to stop. The saw motor and the saw plate oil cylinder can be controlled to work, and judgment of a machine hand is replaced.

Description

Technical Field

[0001] The invention relates to a felling operation control system for a feller and the feller, belonging to the technical field of forestry machinery. Background Art

[0002] During tree felling operations in the forestry industry, operators struggle to observe the actual contact between the remote chain saw and the tree from the cab. As the feller's boom extends, the cutting position moves away from the operator's field of view, making it difficult for the operator to accurately judge when to start and stop the saw. This blind spot often leads to operational delays, resulting in the chain saw assembly failing to return to its original position after the cut, colliding with rocks or dirt surrounding the tree, damaging the saw blade and chain saw, and increasing equipment maintenance costs.

[0003] To address the aforementioned issues, various solutions have been proposed in the prior art. For example, utility model CN221729199U discloses a felling saw for felling trees. This saw uses a saw chain mechanism to cut the tree, and a hydraulic cylinder returns the saw chain after the cut is complete. However, no specific automatic control method is disclosed, making precise timing control difficult. For example, invention CN113243277A discloses a tree handling system. A motor drives a saw guide to cut the tree. An actuator is connected to the saw guide and is used to move the guide from an initial position to a first position and a second position. A controller determines whether the second position has been reached. Upon reaching the second position, the controller sends a pause signal to the tree handling head to initiate the pause operation. This system relies on a single, preset displacement threshold, which can easily lead to misjudgments when the operating environment includes slopes or obstacles. These technologies share common drawbacks: First, they fail to respond in real time to changes in load pressure during the sawing process, making it impossible to distinguish between normal sawing and abnormal jamming. Second, the reset action lacks a pressure-adaptive mechanism, which still presents a risk of collision.

[0004] Existing systems struggle to identify the critical point where the saw blade penetrates the tree, particularly when sawing hardwood or knotty trees. When the chain saw assembly has completely cut through the tree, traditional timing control schemes often trigger the return action too early or too late. Too early can lead to incomplete sawing, while too late can increase the risk of equipment collision. This field has long relied on operator experience, but this human response delay averages 1.2 seconds (according to the Journal of Forestry Machinery, 2023), failing to meet the demands of efficient and safe operations.

[0005] Although current logging machine manufacturers are actively developing protection technologies, they have not yet broken through two major technical bottlenecks: one is the lack of accurate monitoring methods for load pressure throughout the sawing process; the other is the lack of an automatic decision-making mechanism based on pressure feedback. As a result, the equipment still faces core problems such as abnormal wear of hydraulic components and reset collision damage. Summary of the Invention

[0006] The present invention aims to overcome the shortcomings of the prior art and provide a felling machine sawing operation control system and felling machine that can control the operation of the saw motor and saw plate cylinder, replacing the judgment of the felling machine operator. To achieve the above-mentioned object, the present invention adopts the following technical solutions:

[0007] In a first aspect, the present invention provides a felling operation control system for a logging machine, comprising: a controller, a saw motor, a saw bar cylinder, a saw bar and chain saw assembly, a first pressure sensor, and a second pressure sensor;

[0008] The first pressure sensor is used to detect the pressure of the saw plate cylinder circuit; the second pressure sensor is used to detect the load pressure of the saw motor circuit;

[0009] The controller pre-stores a standard value of pressure at the start of sawing, a standard value of pressure at the completion of sawing, and a standard value of pressure at the completion of sawing board return;

[0010] The controller is configured to:

[0011] When sawing is started, the saw motor is controlled to rotate at a preset standard speed and the saw plate cylinder is controlled to drive the saw plate and chain saw assembly to move toward the tree;

[0012] When the detection value of the second pressure sensor exceeds the pressure standard value for starting sawing, the saw motor is switched to rotate at a preset high speed;

[0013] When the detection value of the second pressure sensor drops to the standard value of the sawing completion pressure, the saw motor is controlled to stop, and the saw plate oil cylinder is controlled to drive the saw plate and the chain saw assembly to reset;

[0014] When the detection value of the first pressure sensor is equal to the pressure standard value for completion of saw board return, the saw board cylinder is controlled to stop.

[0015] In combination with the first aspect, optionally, the step of controlling the saw motor to rotate at a preset standard speed includes:

[0016] The controller sends a power-on command to the saw motor control proportional solenoid valve, and the saw motor control proportional solenoid valve drives the second hydraulic reversing valve V to reverse, and the oil port P of the hydraulic main unit supplies oil to the saw motor, so that the saw motor rotates at a preset standard speed.

[0017] In combination with the first aspect, optionally, the step of controlling the saw plate cylinder to drive the saw plate and the chain saw assembly to move toward the tree includes:

[0018] The controller sends a power-on command to the saw plate oil cylinder sawing control proportional solenoid valve, and the saw plate oil cylinder sawing control proportional solenoid valve drives the first hydraulic reversing valve to reverse. The oil port P of the hydraulic main engine supplies oil to the C2 oil port of the saw plate oil cylinder, pushing the piston rod of the saw plate oil cylinder to retract, and driving the saw plate and chain saw assembly to move toward the tree through the connecting rod mechanism.

[0019] In combination with the first aspect, optionally, the step of switching the saw motor to rotate at a preset high speed includes:

[0020] The controller sends a flow increase instruction to the hydraulic main unit, while keeping the saw motor control proportional solenoid valve energized. The flow of oil supplied from the oil port P of the hydraulic main unit to the saw motor increases, driving the saw motor to switch its speed to a preset high speed value.

[0021] In combination with the first aspect, optionally, the step of controlling the saw motor to stop includes:

[0022] The controller sends a power-off command to the proportional solenoid valve controlling the saw motor, and the power-off command triggers the valve core of the second hydraulic reversing valve V4 to reset to the middle position through the spring; after the reset, the valve core of the second hydraulic reversing valve cuts off the oil path from the oil port P of the hydraulic main unit to the saw motor, and the saw motor stops rotating due to the interruption of oil supply.

[0023] In combination with the first aspect, optionally, the step of controlling the saw plate oil cylinder to drive the saw plate and the chain saw assembly to reset includes:

[0024] The controller sends a power-off instruction to the sawing cylinder sawing control proportional solenoid valve, and sends a power-on instruction to the sawing cylinder return control proportional solenoid valve;

[0025] The saw plate oil cylinder returns to control the proportional solenoid valve to drive the first hydraulic reversing valve to reverse, and the oil port P of the hydraulic main engine supplies oil to the C1 oil port of the saw plate oil cylinder, pushing the piston rod of the saw plate oil cylinder to extend, and driving the saw plate and chain saw assembly to return to the initial protection position through the connecting rod mechanism.

[0026] In combination with the first aspect, optionally, the step of controlling the saw plate cylinder to stop includes:

[0027] The controller sends a power-off command to the saw plate oil cylinder return control proportional solenoid valve; the power-off command triggers the valve core of the first hydraulic reversing valve to return to the middle position through the spring;

[0028] After being reset, the valve core of the first hydraulic reversing valve cuts off the oil path from the oil port P of the hydraulic main engine to the sawing plate oil cylinder, and the piston rod of the sawing plate oil cylinder stops moving.

[0029] In combination with the first aspect, optionally, the standard value of the pressure at the start of sawing and the standard value of the pressure at the completion of sawing are determined by working pressure data extracted from a feller test, specifically including:

[0030] Record the load pressure waveform during a standard sawing cycle;

[0031] The peak pressure when the saw blade and chain saw assembly contact the tree is extracted as the standard pressure value for the start of sawing;

[0032] The pressure valley value when the saw blade and chain saw assembly penetrate the tree is extracted as the standard value of the sawing completion pressure;

[0033] The steady-state pressure when the saw plate and chain saw assembly are fully retracted into the guard is extracted as the return completion standard value.

[0034] In combination with the first aspect, optionally, a protective cover is further included, which is used to accommodate the saw plate and chain saw assembly in a non-operating state. The initial position of the saw plate and chain saw assembly is to be stored in the protective cover. When the saw plate and chain saw assembly are completely retracted into the protective cover, the saw plate cylinder circuit pressure is the standard pressure value when the saw plate returns.

[0035] In a second aspect, the present invention provides a felling machine equipped with the felling machine sawing operation control system described in the first aspect.

[0036] Compared with the prior art, the beneficial effects achieved by the felling machine sawing operation control system and the felling machine provided by the embodiments of the present invention include:

[0037] The present invention includes a controller, a saw motor, a saw blade oil cylinder, a saw blade and chain saw assembly, a first pressure sensor, and a second pressure sensor. The first pressure sensor is used to detect the pressure in the saw blade oil cylinder circuit; the second pressure sensor is used to detect the load pressure in the saw motor circuit. The present invention uses the first and second pressure sensors to monitor the pressure in the saw blade oil cylinder circuit and the load pressure in the saw motor circuit in real time, replacing the human eye to observe the far-end sawing state, and can solve the problem of blind spots in vision caused by extended arm span.

[0038] The controller of the present invention pre-stores standard pressure values ​​for the start of sawing, the completion of sawing, and the return of the saw board. The controller of the present invention automatically triggers action switching based on the standard pressure values, eliminating the average 1.2-second human response delay mentioned in the background art and avoiding collision damage to the saw board caused by operation lag.

[0039] When the sawing is started, the present invention controls the saw motor to rotate at a preset standard speed and controls the saw plate oil cylinder to drive the saw plate and chain saw assembly toward the tree. When the detection value of the second pressure sensor exceeds the pressure standard value at the start of sawing, the saw motor is switched to rotate at a preset high speed. The present invention can ensure that the saw motor smoothly cuts into the tree when the sawing is started. The present invention can switch the saw motor to high-speed rotation during the sawing process. The present invention can improve the sawing efficiency of hard trees and avoid the risk of the saw chain getting stuck at low speeds.

[0040] When the detection value of the second pressure sensor drops to the standard value of the sawing completion pressure, the present invention controls the saw motor to stop and controls the saw plate oil cylinder to drive the saw plate and chain saw assembly to reset; when the detection value of the first pressure sensor is equal to the standard value of the saw plate return pressure, the saw plate oil cylinder is controlled to stop. The present invention forms a closed-loop control of the saw plate oil cylinder, which can accurately start and stop the saw plate oil cylinder, eliminate invalid idling and overtravel movement, reduce wear on hydraulic components, and significantly extend the life of the saw motor and saw plate oil cylinder;

[0041] The saw blade reset process of the present invention uses the pressure standard value of the saw blade returning as the action boundary, which can ensure that the saw blade and chain saw assembly automatically avoid obstacles when returning; and can prevent the reset from colliding with rocks or soil piles, solving the core problem of equipment damage in the background technology.

[0042] The present invention can control the operation of the saw motor and the saw plate oil cylinder, replacing the judgment of the machine operator. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a structural diagram of a felling machine sawing operation control system in Example 1 of the present invention. DETAILED DESCRIPTION

[0044] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0045] Example 1:

[0046] like Figure 1 As shown, this embodiment provides a felling operation control system for a lumberjack, including: a hydraulic reversing multi-way valve assembly A1, a saw board cylinder sawing control proportional solenoid valve A2, a saw board cylinder return control proportional solenoid valve A3, a saw board and chain saw assembly A4, a saw board cylinder A5, a saw motor A6, a first pressure sensor A7, a second pressure sensor A8, a controller A9, an electric control handle A10, a display A11, a hydraulic main unit A12 and a saw motor control proportional solenoid valve A13.

[0047] like Figure 1 As shown, in this embodiment, the hydraulic reversing multi-way valve assembly A1 includes a first hydraulic reversing valve V3, a second hydraulic reversing valve V4, a first pressure reducing valve V1, a second pressure reducing valve V2, a third pressure reducing valve V5, and a main safety valve V6.

[0048] Specifically, the first pressure reducing valve V1 is connected to the working oil port of the second hydraulic reversing valve V4 , and the second pressure reducing valve V2 is connected to the working oil port of the first hydraulic reversing valve V3 .

[0049] like Figure 1As shown, in this embodiment, the hydraulic main unit A12 includes the following connections: Port P of the hydraulic main unit A12 is connected to port P of the hydraulic directional multi-way valve assembly A1 to supply oil to the hydraulic directional multi-way valve assembly A1. Port T of the hydraulic main unit A12 is connected to port T of the hydraulic directional multi-way valve assembly A1 for oil return. Port Dr of the main unit hydraulic oil circuit A12 is connected to port Dr of the hydraulic directional multi-way valve assembly A1 to output drain oil from the logging tool hydraulic system to the hydraulic main unit A12.

[0050] As a further improvement, the main safety valve V6 in the hydraulic directional multi-way valve assembly A1 is connected to the oil port T and the oil port P of the hydraulic directional multi-way valve assembly A1 to provide safety protection.

[0051] like Figure 1 As shown, the saw motor A6 in this embodiment includes the following connections: the oil port A and the oil port B of the saw motor A6 are respectively connected to the two working oil ports of the second hydraulic reversing valve V4 in the hydraulic reversing multi-way valve assembly A1, and the oil leakage of the oil port D of the saw motor A6 is output to the hydraulic main engine A12 through the oil leakage port Dr of the hydraulic reversing multi-way valve assembly A1.

[0052] like Figure 1 As shown, the sawing cylinder A5 in this embodiment includes the following connections: the oil port C1 and the oil port C2 of the sawing cylinder A5 are respectively connected to the two working oil ports of the first hydraulic reversing valve V3 in the hydraulic reversing multi-way valve assembly A1.

[0053] like Figure 1 As shown, the first pressure sensor A7 is installed on the C1 oil circuit of the saw plate cylinder to detect the circuit pressure of the C1 oil circuit of the saw plate cylinder. The second pressure sensor A8 is installed on the oil inlet circuit of the saw motor A6 to detect the load pressure of the oil inlet circuit of the saw motor.

[0054] like Figure 1 As shown, the controller A9 in this embodiment includes the following electrical circuit connections: the D1 port of the controller A9 is connected to the electric control handle A10, the D2 port of the controller A9 is connected to the display A11, the D3 port of the controller A9 is connected to the control coil of the saw plate cylinder sawing control proportional solenoid valve A2, the D4 port of the controller A9 is connected to the control coil of the saw plate cylinder return control proportional solenoid valve A3, the D5 port of the controller A9 is connected to the first pressure sensor A7, the D6 port of the controller A9 is connected to the second pressure sensor A8, and the D7 port of the controller A9 is connected to the control coil of the saw motor control proportional solenoid valve A13.

[0055] The controller A9 pre-stores the standard value of pressure at the start of sawing, the standard value of pressure at the completion of sawing, and the standard value of pressure at the completion of sawing board returning.

[0056] The standard values ​​of pressure at the start of sawing and the standard values ​​of pressure at the completion of sawing are determined by the working pressure data extracted from the felling machine test, including:

[0057] Record the load pressure waveform during a standard sawing cycle;

[0058] The peak pressure when the saw blade and chain saw assembly A4 contact the tree is extracted as the standard pressure value for the start of sawing;

[0059] The pressure valley value when the saw plate and chain saw assembly A4 penetrates the tree is extracted as the standard value of the sawing completion pressure.

[0060] In this embodiment, the felling operation control system of the logging machine is further configured with a protective cover (not shown in the figure), which is used to accommodate the saw board and chain saw assembly A4 in a non-operating state.

[0061] The initial position of the saw plate and chain saw assembly A4 is stored in the protective cover. When the saw plate and chain saw assembly A4 are completely retracted into the protective cover, the circuit pressure of the saw plate cylinder A5 is the standard pressure value for the saw plate to return.

[0062] according to Figure 1 The felling machine sawing operation control system shown in this embodiment provides a complete control process for the sawing operation.

[0063] Step 1: The operator uses the electric control handle A10 in the cab of the main machine to operate the machine to hold the target tree in a suitable position, selects the automatic sawing command on the display A11, triggers the sawing button of the electric control handle A10, and the controller A9 determines to start sawing.

[0064] Step 2: When sawing is started, the controller A9 controls the saw motor A6 to rotate at a preset standard speed and controls the saw plate cylinder A5 to drive the saw plate and chain saw assembly A4 to move toward the tree.

[0065] Step 2.1: The controller A9 controls the saw motor A6 to rotate at a preset standard speed.

[0066] Step 2.1.1: Controller A9 sends a power-on command to the saw motor control proportional solenoid valve A13.

[0067] Step 2.1.2: The saw motor controls the proportional solenoid valve A13 to drive the second hydraulic reversing valve V4 to reverse.

[0068] Step 2.1.3: The oil supply port P of the hydraulic main unit A12 supplies oil to the saw motor A6, and the saw motor A6 rotates at a preset standard speed.

[0069] Step 2.2: Controller A9 controls the saw bar cylinder A5 to drive the saw bar and chain saw assembly A4 to move toward the tree.

[0070] Step 2.2.1: Controller A9 sends a power-on command to the sawing cylinder sawing control proportional solenoid valve A2.

[0071] Step 2.2.2: The sawing cylinder cuts and controls the proportional solenoid valve A2 to drive the first hydraulic reversing valve V3 to reverse direction.

[0072] Step 2.2.3: The oil supply port P of the hydraulic main unit A12 supplies oil to the oil port C2 of the saw plate cylinder A5, pushing the piston rod of the saw plate cylinder A5 to retract, and driving the saw plate and chain saw assembly A4 toward the tree through the connecting rod mechanism.

[0073] This embodiment can ensure that the saw motor cuts into the tree smoothly when the sawing is started, can switch the saw motor to high-speed rotation during the sawing process, can improve the sawing efficiency of hard trees, and avoid the risk of saw chain jamming in the low-speed section.

[0074] Step 3: When the detection value of the second pressure sensor A8 exceeds the pressure standard value for starting sawing, the controller A9 switches the saw motor A6 to rotate at a preset high speed.

[0075] When the detection value of the second pressure sensor A8 exceeds the pressure standard value for starting sawing, the saw blade and chain saw assembly A4 come into contact with the tree and sawing starts.

[0076] Step 3.1: The controller A9 sends a flow increase instruction to the hydraulic main unit A12, while keeping the saw motor control proportional solenoid valve A13 energized.

[0077] Step 3.2: The oil flow rate supplied from the oil supply port P of the hydraulic main unit A12 to the saw motor A6 increases, driving the saw motor A6 to switch its speed to a preset high speed value.

[0078] Step 4: When the detection value of the second pressure sensor A8 drops to the standard value of the sawing completion pressure, the controller A9 controls the saw motor A6 to stop and controls the saw plate cylinder A5 to drive the saw plate and chain saw assembly A4 to reset.

[0079] When the detection value of the second pressure sensor A8 drops to the standard value of the sawing completion pressure, the sawing is completed.

[0080] Step 4.1: Controller A9 controls saw motor A6 to stop.

[0081] Step 4.1.1: The controller A9 sends a power-off command to the saw motor control proportional solenoid valve A13. The power-off command triggers the valve core of the second hydraulic reversing valve V4 to return to the middle position through the spring.

[0082] Step 4.1.2: After being reset, the valve core of the second hydraulic reversing valve V4 cuts off the oil path from the oil supply port P of the hydraulic main unit A12 to the saw motor A6, and the saw motor A6 stops rotating due to the interruption of oil supply.

[0083] Step 4.2: Control the saw plate cylinder A5 to drive the saw plate and chain saw assembly A4 to reset.

[0084] Step 4.2.1: Controller A9 sends a power-off command to the sawing cylinder cutting control proportional solenoid valve A2, and sends a power-on command to the sawing cylinder return control proportional solenoid valve A3.

[0085] Step 4.2.2: The sawing cylinder returns to control the proportional solenoid valve A3 to drive the first hydraulic reversing valve V3 to reverse.

[0086] In this embodiment, the pressure oil provided by the hydraulic main engine A12 is reduced in pressure by the third pressure reducing valve V5 and then controls the proportional solenoid valve A3 to drive the first hydraulic reversing valve V3 to reverse direction.

[0087] Step 4.2.3: The oil supply port P of the hydraulic main unit A12 supplies oil to the oil port C1 of the saw plate cylinder A5, pushing the piston rod of the saw plate cylinder A5 to extend, and driving the saw plate and chain saw assembly A4 to return to the initial protection position through the connecting rod mechanism.

[0088] Step 5: When the detection value of the first pressure sensor (A7) is equal to the pressure standard value for completion of saw board return, the controller A9 controls the saw board cylinder (A5) to stop.

[0089] Step 5.1: The controller A9 sends a power-off command to the saw plate oil cylinder return control proportional solenoid valve A3. The power-off command triggers the valve core of the first hydraulic reversing valve V3 to return to the middle position through the spring.

[0090] Step 5.2: After being reset, the valve core of the first hydraulic reversing valve V3 cuts off the oil path from the oil supply port P of the hydraulic main engine A12 to the sawing cylinder A5, and the piston rod of the sawing cylinder A5 stops moving.

[0091] The saw plate resetting process in this embodiment uses the pressure standard value of the saw plate returning as the action boundary, which can ensure that the saw plate and chain saw assembly automatically avoid obstacles when returning; it can prevent reset collision with rocks / earth piles, and solve the core problem of equipment damage in the background technology.

[0092] This embodiment forms a closed-loop control of the saw plate oil cylinder, can accurately start and stop the saw plate oil cylinder, can eliminate invalid idling and overtravel movement, reduce the wear of hydraulic components, and greatly extend the life of the saw motor and saw plate oil cylinder.

[0093] This embodiment monitors the saw plate cylinder circuit pressure and the saw motor circuit load pressure in real time through the first pressure sensor and the second pressure sensor, replacing the human eye to observe the far-end sawing state, and can solve the blind spot problem caused by the extension of the arm span.

[0094] The controller of this embodiment automatically triggers action switching based on the pressure standard value, eliminating the average human response delay of 1.2 seconds mentioned in the background technology, and avoiding collision damage to the saw board caused by operation lag.

[0095] Example 2:

[0096] This embodiment provides a felling machine equipped with the felling machine sawing operation control system described in Example 1.

[0097] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A felling machine sawing operation control system, characterized in that: include: a controller (A9), a saw motor (A6), a saw plate cylinder (A5), a saw plate and chain saw assembly (A4), a first pressure sensor (A7) and a second pressure sensor (A8); The first pressure sensor (A7) is used to detect the circuit pressure of the saw plate oil cylinder (A5); the second pressure sensor (A8) is used to detect the load pressure of the saw motor (A6) circuit; The controller (A9) pre-stores a standard value of pressure at the start of sawing, a standard value of pressure at the completion of sawing, and a standard value of pressure at the completion of sawing board return; The controller (A9) is configured to: When sawing is started, the saw motor (A6) is controlled to rotate at a preset standard speed and the saw plate cylinder (A5) is controlled to drive the saw plate and chain saw assembly (A4) to move toward the tree; When the detection value of the second pressure sensor (A8) exceeds the pressure standard value for starting sawing, the saw motor (A6) is switched to rotate at a preset high speed; When the detection value of the second pressure sensor (A8) drops to the standard value of the sawing completion pressure, the saw motor (A6) is controlled to stop, and the saw plate oil cylinder (A5) is controlled to drive the saw plate and chain saw assembly (A4) to reset; When the detection value of the first pressure sensor (A7) is equal to the pressure standard value for completion of saw board return, the saw board oil cylinder (A5) is controlled to stop.

2. The felling machine sawing operation control system according to claim 1, characterized in that: The steps for controlling the saw motor (A6) to rotate at a preset standard speed include: The controller (A9) sends a power-on command to the saw motor control proportional solenoid valve (A13), and the saw motor control proportional solenoid valve (A13) drives the second hydraulic reversing valve (V4) to reverse direction, and the oil port P of the hydraulic main unit (A12) supplies oil to the saw motor (A6), so that the saw motor (A6) rotates at a preset standard speed.

3. The felling machine sawing operation control system according to claim 1, characterized in that: The steps for controlling the saw plate oil cylinder (A5) to drive the saw plate and chain saw assembly (A4) to move toward the tree include: The controller (A9) sends a power-on command to the saw plate oil cylinder sawing control proportional solenoid valve (A2), and the saw plate oil cylinder sawing control proportional solenoid valve (A2) drives the first hydraulic reversing valve (V3) to change direction. The oil port P of the hydraulic main engine (A12) supplies oil to the oil port C2 of the saw plate oil cylinder (A5), pushing the piston rod of the saw plate oil cylinder (A5) to retract, and driving the saw plate and chain saw assembly (A4) to move toward the tree through the connecting rod mechanism.

4. The felling machine sawing operation control system according to claim 1, characterized in that: The steps of switching the saw motor (A6) to rotate at a preset high speed include: The controller (A9) sends a flow increase instruction to the hydraulic main unit (A12) and keeps the saw motor control proportional solenoid valve (A13) energized. The flow rate of oil supplied from the oil port P of the hydraulic main unit (A12) to the saw motor (A6) increases, driving the saw motor (A6) to switch its speed to a preset high speed value.

5. The felling machine sawing operation control system according to claim 1, characterized in that: The steps for controlling the saw motor (A6) to stop include: The controller (A9) sends a power-off command to the saw motor control proportional solenoid valve (A13), and the power-off command triggers the valve core of the second hydraulic reversing valve (V4) to return to the middle position via the spring; after the valve core of the second hydraulic reversing valve (V4) is reset, it cuts off the oil path from the oil port P of the hydraulic main unit (A12) to the saw motor (A6), and the saw motor (A6) stops rotating due to the interruption of oil supply.

6. The felling machine sawing operation control system according to claim 1, characterized in that: The steps for controlling the saw plate oil cylinder (A5) to drive the saw plate and chain saw assembly (A4) to reset include: The controller (A9) sends a power-off instruction to the sawing cylinder sawing control proportional solenoid valve (A2), and sends a power-on instruction to the sawing cylinder return control proportional solenoid valve (A3); The saw plate oil cylinder returns to control the proportional solenoid valve (A3) to drive the first hydraulic reversing valve (V3) to reverse, and the oil port P of the hydraulic main unit (A12) supplies oil to the oil port C1 of the saw plate oil cylinder (A5), pushing the piston rod of the saw plate oil cylinder (A5) to extend, and driving the saw plate and chain saw assembly (A4) to return to the initial protection position through the connecting rod mechanism.

7. The felling machine sawing operation control system according to claim 1, characterized in that: The steps for controlling the saw plate oil cylinder (A5) to stop include: The controller (A9) sends a power-off command to the saw plate oil cylinder return control proportional solenoid valve (A3); the power-off command triggers the valve core of the first hydraulic reversing valve (V3) to return to the middle position via the spring; After being reset, the valve core of the first hydraulic reversing valve (V3) cuts off the oil path from the oil port P of the hydraulic main engine (A12) to the saw plate oil cylinder (A5), and the piston rod of the saw plate oil cylinder (A5) stops moving.

8. The felling machine sawing operation control system according to claim 1, characterized in that: The standard values ​​of pressure at the start of sawing and the standard values ​​of pressure at the completion of sawing are determined by the working pressure data extracted from the felling machine test, specifically including: Record the load pressure waveform during a standard sawing cycle; The peak pressure when the saw blade and chain saw assembly (A4) contacts the tree is extracted as the standard pressure value for the start of sawing; The pressure valley value when the saw blade and chain saw assembly (A4) penetrates the tree is extracted as the standard value of the sawing completion pressure; The steady-state pressure of the saw plate and chain saw assembly (A4) when the guard is fully retracted is extracted as the return completion standard value.

9. The felling machine sawing operation control system according to claim 1, characterized in that: It also includes a protective cover, which is used to accommodate the saw plate and chain saw assembly (A4) in a non-operating state. The initial position of the saw plate and chain saw assembly (A4) is to be stored in the protective cover. When the saw plate and chain saw assembly (A4) are completely retracted into the protective cover, the circuit pressure of the saw plate cylinder (A5) is the standard pressure value for the completion of the saw plate return.

10. A logging machine, characterized in that: The felling machine is equipped with a felling operation control system according to any one of claims 1 to 9.

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