Logging machine tool main valve integrating multiple functions

Abstract

The invention discloses a lumbering machine tool main valve integrated with multiple functions. A load-sensitive valve group for upstream compensation is arranged to accurately and synchronously control a feeding roller, and the rotating speeds of two roller motors are kept the same and are not influenced by loads; a pressure reducing valve and an integrated control oil port are arranged, so that pilot control oil can be provided to drive a chain saw lubricating valve to realize chain lubrication; a main electromagnetic valve and a chain saw two-way flow valve are arranged for control, so that the rotating speed of a chain saw motor is basically constant; a plurality of sandwich valve groups consisting of buffer oil suction valve groups, sandwich one-way valves, sandwich pressure reducing valves and electromagnetic directional valves are arranged, so that pressure and direction control can be carried out on a plurality of actuating mechanisms; meanwhile, the valve group integrates various functional control oil ports and oil ways, the oil way of a hydraulic system can be simplified, the integration degree is high, the size is small, and the valve group can be conveniently installed in a narrow space in a cutting head of a feller.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic pressure of excavating machinery, and in particular to a main valve of a logging machine with integrated multiple functions. Background Art

[0002] Currently, with the growing demand in the forestry market, more and more host companies are choosing to improve the actuators and hydraulic systems based on the flexible and efficient platform of excavators. They have designed and launched derivative models suitable for forestry operations and full-time logging. They use logging equipment instead of traditional buckets. This type of logging equipment can hold trees tightly and cut them into several trunks of the required length.

[0003] A typical felling machine typically features front and rear claws, a saw blade, a feed roller, and a tilting mechanism. The front and rear claws grip the tree trunk, severing forked branches and performing the limbing function. The saw blade cuts the trunk, and the feed roller advances the tree a certain distance after each cut, allowing the tree to be cut into multiple sections. The tilting mechanism adjusts the felling machine's posture, allowing it to lay down a vertical tree horizontally after cutting. Opening and closing the front and rear claws, feeding the chainsaw and blade, rotating and clamping the feed roller, and tilting the machine are typical functions of a felling machine. Some felling machines also offer additional optional features. For example, a measuring roller ensures that each section is the desired length. A slewing mechanism allows the entire machine to rotate and adjust its posture to accommodate complex forest terrain. Other features include chain saw blade lubrication and tensioning. These functions of logging equipment are relatively complex and require multiple actuators such as cylinders and hydraulic motors to achieve. Therefore, in addition to the excavator main valve, a special logging equipment main valve is required for control.

[0004] In order to meet the working conditions, most of the main valves of logging tools on the market are specially designed special valves, but they are nothing more than throttling integrated valves composed of several plate valves and superimposed valves or load-sensitive plate-type multi-way valves. Summary of the Invention

[0005] In view of the problems existing in the above-mentioned prior art, the present invention provides a main valve for logging machinery integrating multiple functions, including a main integrated valve group, a load-sensitive valve group, a buffer integrated valve group, a two-way flow valve, a valve block, a buffer oil suction valve group, a superimposed one-way valve, a superimposed electric proportional pressure reducing valve, a superimposed pressure reducing valve, a three-position four-way electromagnetic reversing valve, a two-position four-way electromagnetic reversing valve, and a three-position four-way proportional reversing valve. The invention sets a load-sensitive valve group for pre-valve compensation to precisely and synchronously control the feed rollers, and the speeds of the two roller motors remain the same and are not affected by the load; a reduction valve is set The pressure valve is integrated with the control oil port, which can provide pilot control oil to drive the chain saw lubrication valve to achieve chain lubrication; the main solenoid valve and the chain saw two-way flow valve are set for control, so that the speed of the chain saw motor is basically constant; multiple groups of superimposed valve groups consisting of buffer oil suction valve groups, superimposed one-way valves, superimposed pressure reducing valves, and electromagnetic reversing valves are set to control the pressure and direction of multiple actuators; at the same time, the valve group integrates multiple functional control oil ports and oil circuits, which can simplify the hydraulic system oil circuit, has high integration and small size, and is easy to install in the narrow space inside the harvesting head of logging machinery.

[0006] Among them, load sensing is a hydraulic technology that is not affected by load pressure and can sense and provide only the pressure and flow required by the system.

[0007] A more compact design, developed from the plate-type valve, the stacking valve features mounting surfaces on both the top and bottom surfaces, each with inlet and outlet ports. Valves of the same specification but different functions have identical ports and mounting holes in the same locations and sizes. To use the valves, stack them according to the needs of the hydraulic circuit and secure them to the valve block with long bolts. System piping is connected to the ports on the block.

[0008] To achieve the above objectives, the present invention adopts a technical solution: a main valve for a logging tool that integrates multiple functions, comprising: a main integrated valve group, a load-sensing valve group, a buffer integrated valve group, a two-way flow valve, a valve block, a roller clamping valve group, a front blade opening and closing valve group, a rear blade opening and closing valve group, a tilting valve group, a saw blade feed valve group, a rotary valve group, and a length measuring sensor roller retraction and extension valve group; The two-way flow valve is installed on the main integrated valve group. The outlet of the two-way flow valve is connected to the chain saw motor. The main integrated valve group controls the on-off of the oil supply line to the two-way flow valve, thereby controlling the start and stop of the chain saw motor connected to the outlet of the two-way flow valve. The two load-sensing valves are installed on the main integrated valve group, and each load-sensing valve is connected to a feed roller motor. The two feed rollers are precisely and synchronously controlled by the two load-sensing valves so that the speeds of the two feed roller motors remain the same and are not affected by the load. The buffer integrated valve group is installed on one of the load-sensing valve groups. The buffer integrated valve group is used to limit the main oil circuit pressure of the P port of the main integrated valve group of the felling machine and provide external pilot oil for other valves. The main integrated valve group, roller clamping valve group, front knife opening and closing valve group, rear knife opening and closing valve group, tilting valve group, saw blade feed valve group, rotary valve group, and length measuring sensor roller retraction and extension valve group are installed on the valve block, and the valve block serves to communicate the main integrated valve group and the roller clamping valve group, front knife opening and closing valve group, rear knife opening and closing valve group, tilting valve group, saw blade feed valve group, rotary valve group, and length measuring sensor roller retraction and extension valve group.

[0009] Furthermore, two load-sensing valve groups are respectively superimposed on the upper and lower sides of the main integrated valve group.

[0010] Furthermore, the main integrated valve group is provided with a pressure reducing valve A of the main valve of the logging tool, a main solenoid valve, a P-port main oil circuit, a T-port return oil circuit, a Dr oil drain port oil circuit and corresponding pressure measuring joints for troubleshooting. The inlet of the pressure reducing valve A is connected to the P-port main oil circuit, the outlet of the pressure reducing valve A is connected to two load-sensitive valves respectively, the oil drain port of the pressure reducing valve A is connected to the Dr oil drain port oil circuit, the inlet of the main solenoid valve is connected to the P-port main oil circuit, and the outlet of the main solenoid valve is connected to the inlet of the two-way flow valve. The on-off of the oil supply circuit to the two-way flow valve is controlled by controlling the power on and off of the main solenoid valve, thereby controlling the start and stop of the chain saw motor connected to the outlet V of the two-way flow valve.

[0011] Furthermore, the load-sensitive valve group is provided with a main valve core, a pressure compensation valve, a pilot solenoid valve, a buffer oil suction valve A, a working oil circuit A, a working oil circuit B and corresponding pressure measuring oil circuits a and b for troubleshooting. The load-sensitive valve group is connected to the feed roller motor through the oil ports on the working oil circuit A and the working oil circuit B. The inlet of the pressure compensation valve is connected to the P-port main oil circuit of the main integrated valve group, and the outlet of the pressure compensation valve is connected to the inlet on the main valve core. The pressure compensation valve is used to keep the inlet and outlet pressure difference of the main valve core constant. When the main valve core is in the working position, the outlet of the main valve core is connected to the working oil circuit A or the working oil circuit B, and the return oil circuit of the main valve core is connected to the T-port return oil circuit of the main integrated valve group. The working oil circuit A and the working oil circuit B are controlled to be on and off through the main valve core. The outlet feedback oil circuit is connected to the pressure measuring oil circuit a and the pressure measuring oil circuit b. The two buffer oil suction valves A are arranged on the working oil circuit A and the working oil circuit B. The outlet of the buffer oil suction valve A is connected to the T-port return oil circuit of the main integrated valve group. The buffer oil suction valve A is used to limit the working port pressure to protect the motor and replenish oil to the motor to prevent air suction; the inlets of the two pilot solenoid valves are connected to the outlet of the pressure reducing valve A in the main integrated valve group. The pressure reducing valve A in the main integrated valve group can provide a pilot oil source for the pilot solenoid valve. The outlets of the two pilot solenoid valves are respectively connected to the two sides of the main valve core. The movement stroke of the main valve core is controlled by the pilot solenoid valve, thereby controlling the output flow rate of the working port. The oil drain ports of the pilot solenoid valves on the two load-sensitive valve groups are both connected to the Dr oil drain port oil circuit.

[0012] Furthermore, the buffer integrated valve group is provided with a buffer oil suction valve B, a pressure reducing valve B and an oil port C for providing external pilot oil to other valves. The inlet and outlet of the buffer oil suction valve B are respectively connected to the P-port main oil circuit and the T-port return oil circuit in the main integrated valve group through the oil channel in the load-sensitive valve group. The inlet of the pressure reducing valve B is connected to the inlet of the buffer oil suction valve B, and the outlet of the pressure reducing valve B is connected to the C oil port, which can provide external pilot oil to other valves. The oil drain port of the pressure reducing valve B is connected to the outlet of the buffer oil suction valve B, and the main oil circuit pressure of the P port of the main valve of the logging machine is limited by the buffer oil suction valve B.

[0013] Furthermore, the C oil port is connected to the pilot oil source port of the sawtooth lubrication valve of the felling machine to supply oil thereto, thereby driving the piston movement of the sawtooth lubrication valve to realize the chain lubrication function.

[0014] Furthermore, the valve block is provided with a P-port oil branch circuit, a T-port oil return circuit, and seven groups of working oil circuits, and the seven groups of working oil circuits are A1 and B1, A2 and B2, A3 and B3, A4 and B4, A5 and B5, A6 and B6, A7 and B7; the P-port oil branch circuit and the T-port oil return circuit in the valve block are respectively connected with the P-port main oil circuit and the T-port oil return circuit in the main integrated valve group, and are respectively connected with the oil inlet and return circuits in the roller clamping valve group, the front knife opening and closing valve group, the rear knife opening and closing valve group, the tilting valve group, the saw blade feed valve group, the rotary valve group, and the length measuring sensor roller retraction and extension valve group through the P-port oil branch circuit and the T-port oil return circuit; the roller clamping valve group, the front knife opening and closing valve group, and the rear knife opening and closing valve group are respectively connected with the three groups of working oil circuits A1 and B1, A2 and B2, and A3 and B3. Then, the oil ports on the three groups of working oil circuits A1 and B1, A2 and B2, A3 and B3 are connected to the roller clamping cylinder, the front claw knife cylinder and the rear claw knife cylinder respectively, the tilting valve group is connected to the working oil circuits A4 and B4, the oil ports on the working oil circuits A4 and B4 are connected to the tilting cylinder to control the tilting function, the saw blade feed valve group is connected to the working oil circuits A5 and B5, the oil ports on the working oil circuits A5 and B5 are connected to the saw blade feed cylinder to control the saw blade feeding function; the rotary valve group is connected to the working oil circuits A6 and B6, the oil ports on the working oil circuits A6 and B6 are connected to the rotary motor to control the rotation function of the felling machine, the length measuring sensor roller retraction and extension valve group is connected to the working oil circuits A7 and B7, the oil ports on the working oil circuits A7 and B7 are connected to the retraction and extension cylinder to control the feed function of the length measuring sensor.

[0015] Furthermore, the roller clamping valve group, the front knife opening and closing valve group, and the rear knife opening and closing valve group all include: a buffer oil suction valve group, a superimposed one-way valve, a superimposed electric proportional pressure reducing valve and an O-type neutral position function three-position four-way electromagnetic reversing valve. The buffer oil suction valve group serves to limit the working pressure to protect the roller clamping oil cylinder / front claw knife oil cylinder / rear claw knife oil cylinder. The superimposed one-way valve can prevent oil leakage. The three-position four-way electromagnetic reversing valve with an O-type neutral position function controls the direction and on-off of the working oil circuit. Since the O-type function ensures that the working oil circuit is cut off when the three-position four-way electromagnetic reversing valve is not energized, the superimposed electric proportional pressure reducing valve controls the pressure. By presetting the current values of the input electric proportional pressure reducing valves corresponding to multiple different tree types in the controller program, the clamping pressure of the front claw knife, rear claw knife and feed roller is adjusted.

[0016] Furthermore, the tilting valve group includes: a superimposed pressure reducing valve, a superimposed check valve, a buffer oil suction valve group and a three-position four-way solenoid reversing valve with a Y-type mid-position function. The superimposed pressure reducing valve controls the pressure of the working oil circuits A4 and B4, the buffer oil suction valve group serves to limit the working pressure and protect the tilting cylinder, the superimposed check valve can prevent oil cross-contamination, and the three-position four-way solenoid reversing valve with a Y-type mid-position function serves to control the direction of the working port oil circuit. Due to the Y-type function, the working oil circuits A4 and B4 are connected to the T-port return oil circuit when power is off, which can meet the floating working condition requirements of the tilting valve group.

[0017] Furthermore, the saw blade feed valve group includes: a superimposed pressure reducing valve, a superimposed one-way valve, and a two-position four-way electromagnetic reversing valve. The superimposed pressure reducing valve controls the pressure of the working oil circuits A5 and B5, the superimposed one-way valve can prevent oil leakage, and the two-position four-way electromagnetic reversing valve controls the direction of the working oil circuit, thereby controlling the saw blade to swing outward for cutting operations or controlling the saw blade to remain in the retracted state.

[0018] Furthermore, the rotary valve group includes: a buffer oil suction valve group and a three-position four-way proportional reversing valve. The buffer oil suction valve group serves to limit the working pressure and protect the rotary motor. The three-position four-way proportional reversing valve can not only control the direction of the working oil circuits A6 and B6, but also control the output flow of the working oil circuit by controlling the current input to the three-position four-way proportional reversing valve, thereby realizing precise control of the rotary speed of the machine.

[0019] Furthermore, the length measuring sensor roller retraction and extension valve group includes: a superimposed pressure reducing valve and a two-position four-way electromagnetic reversing valve. The superimposed pressure reducing valve controls the pressure of the working oil circuits A7 and B7, and the two-position four-way electromagnetic reversing valve controls the extension or retraction of the length measuring sensor roller.

[0020] The beneficial effects of the present invention are: (1) The main valve of the logging tool provided by the present invention integrates multiple functions and control oil ports, can perform pressure and direction control on multiple actuators, meet the working conditions of the logging tool, have high integration, and simplify the hydraulic system of the whole vehicle and its pipeline layout; (2) The load-sensitive valve group with pre-valve compensation in the present invention can precisely and synchronously control the feed rollers, and can realize the function that the flow rate is independent of the load, which cannot be realized by the traditional throttling integrated valve group. The speeds of the two roller motors can be kept the same and are not affected by the load, thus avoiding the problem that the motor speed decreases due to the increase in load, resulting in inaccurate wood feeding length or feeding difficulties, and the problem that the two motor speeds are inconsistent due to different loads, resulting in scratches on the bark; (3) The present invention is provided with a pressure reducing valve and an integrated control oil port, which can provide external pilot oil for other valves, such as driving a chain saw lubrication valve to achieve chain lubrication; (4) The present invention sets a main solenoid valve and a chain saw two-way flow valve to control the chain saw motor, so that the speed of the chain saw motor is basically constant. The speed of the chain saw motor is not affected by the depth of the cut, and the chain can be driven to perform felling operations smoothly; (5) The present invention provides an electric proportional pressure reducing valve to control the clamping pressure of the front claw knife, the rear claw knife and the feed roller. By presetting the input current corresponding to a variety of different tree types in the controller program, the clamping pressure of the front claw knife, the rear claw knife and the feed roller can be conveniently adjusted; (6) The present invention sets a three-position four-way electromagnetic reversing valve with a Y-shaped neutral position function to control the tilting cylinder, which can meet the floating working condition requirements of the tilting mechanism with a low cost and simple structure; (7) The present invention sets a three-position four-way proportional reversing valve to control the rotary motor, which can achieve precise control of the machine's rotary speed and flexibly adjust the machine's posture in forest terrain; (8) The present invention is provided with a two-position four-way electromagnetic reversing valve to control the saw blade feeding and the length measuring sensor feeding function, which can prevent the safety hazards caused by the saw blade not being fully retracted and the error value accumulation caused by the length measuring sensor not being fully retracted; (9) The present invention sets up multiple groups of superimposed valves consisting of a buffer oil suction valve group, a superimposed one-way valve, a superimposed pressure reducing valve, and an electromagnetic reversing valve for control. The whole valve has a high degree of integration and a small size. It can simplify the hydraulic system pipeline and is easy to install in the narrow space of the harvesting head of the felling machine. At the same time, it is lower in cost than the load-sensitive multi-way valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of the main structure of a logging machine main valve with integrated multiple functions according to the present invention; Figure 2 A schematic diagram of the right side structure of the main valve of the logging machine with integrated multiple functions according to the present invention; Figure 3A schematic diagram of the structure of the main valve of a logging machine with multiple functions integrated in the present invention from the left side; Figure 4 A schematic diagram of the structure of the main valve of the logging machine with integrated multiple functions according to the present invention, viewed from above; Figure 5 Hydraulic principle diagram of the main valve of the logging machine with integrated multiple functions according to the present invention; Figure 6 for Figure 5 Partially enlarged structure diagram Figure 1 ; Figure 7 for Figure 5 Partially enlarged structure diagram Figure 2 ; In the figure: 1. Main integrated valve group; 1.1. Pressure reducing valve A; 1.2. Main solenoid valve; 2. Load-sensitive valve group; 2.1. Main valve core; 2.2. Pressure compensating valve; 2.3. Pilot solenoid valve; 2.4. Buffer oil suction valve A; 3. Buffer integrated valve group; 3.1. Buffer oil suction valve B; 3.2. Pressure reducing valve B; 4. Two-way flow valve; 5. Valve block; 6. Buffer oil suction valve group; 7. Superimposed one-way valve; 8. Superimposed electric proportional pressure reducing valve; 9. Three-position four-way solenoid reversing valve with O-type neutral position function; 10. Superimposed pressure reducing valve; 11. Three-position four-way solenoid reversing valve with Y-type neutral position function; 12. Two-position four-way solenoid reversing valve; 13. Three-position four-way proportional reversing valve. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention pertains. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0024] like Figure 1-7 As shown, a main valve for a logging tool with multiple functions is provided, comprising: a main integrated valve group 1, a load-sensing valve group 2, a buffer integrated valve group 3, a two-way flow valve 4, a valve block 5, a roller clamping valve group, a front blade opening and closing valve group, a rear blade opening and closing valve group, a tilting valve group, a saw blade feed valve group, a rotary valve group, and a length measuring sensor roller retraction and extension valve group; The two-way flow valve 4 is installed on the main integrated valve group 1. The outlet of the two-way flow valve 4 is connected to the chain saw motor. The main integrated valve group 1 controls the on-off of the oil supply line to the two-way flow valve 4, thereby controlling the start and stop of the chain saw motor connected to the outlet of the two-way flow valve 4. The two load-sensing valves are installed on the main integrated valve group 1. Each load-sensing valve is connected to a feed roller motor. The two feed rollers are precisely and synchronously controlled by the two load-sensing valves so that the speeds of the two feed roller motors remain the same and are not affected by the load. The buffer integrated valve group 3 is installed on one of the load-sensing valve groups 2. The buffer integrated valve group 3 is used to limit the main oil circuit pressure of the P port of the main integrated valve group 1 of the logging machine and provide external pilot oil for other valves. The main integrated valve group 1, roller clamping valve group, front knife opening and closing valve group, rear knife opening and closing valve group, tilting valve group, saw blade feed valve group, rotary valve group, and length measuring sensor roller retraction valve group are installed on the valve block 5. The valve block 5 serves to communicate the main integrated valve group 1 and the roller clamping valve group, front knife opening and closing valve group, rear knife opening and closing valve group, tilting valve group, saw blade feed valve group, rotary valve group, and length measuring sensor roller retraction valve group.

[0025] The two load-sensing valve groups 2 are respectively superimposed on the upper and lower sides of the main integrated valve group 1 .

[0026] The main integrated valve group 1 is equipped with a pressure reducing valve A1.1 of the main valve of the logging tool, a main solenoid valve 1.2, a P-port main oil circuit, a T-port return oil circuit, a Dr oil drain port oil circuit and corresponding pressure measuring joints for troubleshooting. The inlet of the pressure reducing valve A1.1 is connected to the P-port main oil circuit, and the outlet of the pressure reducing valve A1.1 is connected to two load-sensitive valves respectively. The oil drain port of the pressure reducing valve A1.1 is connected to the Dr oil drain port oil circuit, the inlet of the main solenoid valve 1.2 is connected to the P-port main oil circuit, and the outlet of the main solenoid valve 1.2 is connected to the inlet of the two-way flow valve 4. The oil supply circuit to the two-way flow valve 4 is controlled by controlling the power on and off of the main solenoid valve 1.2, thereby controlling the start and stop of the chain saw motor connected to the outlet V of the two-way flow valve 4.

[0027] Since the speeds of the two roller motors need to be kept basically consistent when feeding wood, the design of the load-sensing valve group 2 adopts the typical pre-valve compensation principle; the load-sensing valve group 2 is provided with a main valve core 2.1, a pressure compensation valve 2.2, a pilot solenoid valve 2.3, a buffer oil suction valve A2.4, a working oil circuit A, a working oil circuit B and corresponding pressure measuring oil circuits a and b for troubleshooting. The load-sensing valve group 2 is connected to the feed roller motor through the oil ports on the working oil circuit A and the working oil circuit B. The inlet of the pressure compensation valve 2.2 is connected to the P-port main oil circuit of the main integrated valve group 1, and the outlet of the pressure compensation valve 2.2 is connected to the inlet of the main valve core 2.1. The pressure compensation valve 2.2 is used to keep the inlet and outlet pressure difference of the main valve core 2.1 constant. When the main valve core 2.1 is in the working position, the outlet of the main valve core 2.1 is connected to the working oil circuit A or the working oil circuit B, and the return oil circuit of the main valve core 2.1 is connected to the T-port return oil circuit of the main integrated valve group 1. The working oil circuit A and the working oil circuit B are controlled to be on and off, and the outlet feedback oil circuit of the main valve core 2.1 is connected to the pressure measuring oil circuit a and the pressure measuring oil circuit b. The two buffer oil suction valves A2.4 are arranged on the working oil circuit A and the working oil circuit B. The outlet of the buffer oil suction valve A2.4 is connected to the T-port return oil circuit of the main integrated valve group 1. The buffer oil suction valve A2.4 is used to limit the working port pressure to protect the roller motor and replenish oil to the roller motor to prevent air suction; the inlets of the two pilot solenoid valves 2.3 are connected to the outlet of the pressure reducing valve A1.1 in the main integrated valve group 1. The pressure reducing valve A1.1 in the main integrated valve group 1 can provide a pilot oil source for the pilot solenoid valve 2.3. The outlets of the two pilot solenoid valves 2.3 are respectively connected to the two sides of the main valve core 2.1. The movement stroke of the main valve core 2.1 is controlled by the pilot solenoid valve 2.3, thereby controlling the output flow rate of the working port. The drain ports of the pilot solenoid valves 2.3 on the two load-sensitive valve groups 2 are both connected to the Dr drain port oil circuit.

[0028] By setting the pressure compensation valve 2.2, the pressure difference between the inlet and outlet of the main valve core 2.1 can be kept constant, so that the output flow of the working port is related to the stroke of the main valve core 2.1 and is independent of the load. The two feed rollers can be precisely and synchronously controlled, and the speeds of the two roller motors can be kept the same and unaffected by the load. This avoids the problem of inaccurate wood feed length or feeding difficulty caused by a decrease in motor speed due to an increase in load, and the problem of scratching the bark due to inconsistent speeds of the two motors due to different loads.

[0029] The buffer integrated valve group 3 is provided with a buffer oil suction valve B3.1, a pressure reducing valve B3.2 and an oil port C for providing external pilot oil to other valves. The inlet and outlet of the buffer oil suction valve B3.1 are respectively connected to the P-port main oil circuit and the T-port return oil circuit in the main integrated valve group 1 through the oil channel in the load-sensing valve group 2. The inlet of the pressure reducing valve B3.2 is connected to the inlet of the buffer oil suction valve B3.1, and the outlet of the pressure reducing valve B3.2 is connected to the C oil port, which can provide external pilot oil to other valves. The oil drain port of the pressure reducing valve B3.2 is connected to the outlet of the buffer oil suction valve B3.1, and the pressure of the main oil circuit of the P port of the main valve of the logging machine is limited through the buffer oil suction valve B3.1.

[0030] For example: the C oil port is connected to the pilot oil source port of the sawtooth lubrication valve of the felling machine to supply oil to it, so as to drive the piston movement of the sawtooth lubrication valve to realize the chain lubrication function.

[0031] The valve block 5 is internally provided with a P-port oil branch circuit, a T-port oil return circuit, and seven groups of working oil circuits. The seven groups of working oil circuits are A1 and B1, A2 and B2, A3 and B3, A4 and B4, A5 and B5, A6 and B6, A7 and B7; the P-port oil branch circuit and the T-port oil return circuit in the valve block 5 are respectively connected to the P-port main oil circuit and the T-port oil return circuit in the main integrated valve group 1, and are respectively connected to the inlet and outlet oil circuits of the roller clamping valve group, the front knife opening and closing valve group, the rear knife opening and closing valve group, the tilting valve group, the saw blade feed valve group, the rotary valve group, and the length measuring sensor roller retraction and extension valve group through the P-port oil branch circuit and the T-port oil return circuit. The roller clamping valve group, the front knife opening and closing valve group, and the rear knife opening and closing valve group are respectively connected to the three groups of working oil circuits A1 and B1, A2 and B2, and A3 and B3. The oil ports on the three groups of working oil circuits A1 and B1, A2 and B2, A3 and B3 are connected to the roller clamping cylinder, the front claw knife cylinder and the rear claw knife cylinder respectively; the tilting valve group is connected to the working oil circuits A4 and B4; the oil ports on the working oil circuits A4 and B4 are connected to the tilting cylinder to control the tilting function; the saw blade feed valve group is connected to the working oil circuits A5 and B5; the oil ports on the working oil circuits A5 and B5 are connected to the saw blade feed cylinder to control the saw blade feed function; the rotary valve group is connected to the working oil circuits A6 and B6; the oil ports on the working oil circuits A6 and B6 are connected to the rotary motor to control the rotation function of the felling machine; the length measuring sensor roller retraction and extension valve group is connected to the working oil circuits A7 and B7; the oil ports on the working oil circuits A7 and B7 are connected to the retraction and extension cylinder to control the feed function of the length measuring sensor.

[0032] In order to realize the roller clamping and front and rear claw knife opening and closing functions to meet the wood feeding conditions, the roller clamping valve group, the front knife opening and closing valve group, and the rear knife opening and closing valve group all include: a buffer oil suction valve group 6, a superimposed one-way valve 7, a superimposed electric proportional pressure reducing valve 8 and a three-position four-way electromagnetic reversing valve 9 with an O-type neutral position function.

[0033] Among them, the roller clamping valve group: the inlet of the superimposed one-way valve 7 is connected to the oil branch line of the valve block 5P port through the oil inlet circuit of the roller clamping valve group, the outlet of the superimposed one-way valve 7 is connected to the inlet of the superimposed electric proportional pressure reducing valve 8, the outlet of the superimposed electric proportional pressure reducing valve 8 is connected to the inlet of the three-position four-way solenoid reversing valve 9 with the O-type neutral function, the return oil port of the three-position four-way solenoid reversing valve 9 with the O-type neutral function is connected to the T-port return oil circuit on the valve block 5 through the return oil circuit of the roller clamping valve group, the two working oil ports of the three-position four-way solenoid reversing valve 9 with the O-type neutral function are respectively connected to the working oil circuits A1 and B1 through the working oil channels, and two buffer oil suction valves are provided in the buffer oil suction valve group 6, and the outlets of the two buffer oil suction valves are connected to the roller clamping valve group The return oil circuit is connected, and the inlets of the two buffer oil suction valves are respectively connected to the two working oil circuits of the roller clamping valve group; the buffer oil suction valve group 6 serves to limit the working pressure and protect the roller clamping cylinder. The superimposed one-way valve 7 can prevent oil leakage. The three-position four-way electromagnetic reversing valve 9 with the O-type mid-position function controls the direction and on-off of the working oil circuits A1 and B1, thereby controlling the operation of the clamping cylinder. The O-type function ensures that the three-position four-way electromagnetic reversing valve 9 with the O-type mid-position function is not energized when the working oil circuits A1 and B1 are cut off. The superimposed electric proportional pressure reducing valve 8 controls the pressure. The current value of the input electric proportional pressure reducing valve corresponding to a variety of different tree types is preset in the controller program to adjust the feed roller clamping pressure.

[0034] Front knife opening and closing valve group / rear knife opening and closing valve group: the inlet of the superimposed electric proportional pressure reducing valve 8 is connected to the oil branch line of the valve block 5P port through the oil inlet circuit of the front knife opening and closing valve group / rear knife opening and closing valve group, the outlet of the superimposed electric proportional pressure reducing valve 8 is connected to the inlet of the superimposed check valve 7, the outlet of the superimposed check valve 7 is connected to the inlet of the three-position four-way solenoid reversing valve 9 with O-type mid-position function, the return oil port of the three-position four-way solenoid reversing valve 9 with O-type mid-position function is connected to the T-port return oil circuit on the valve block 5 through the return oil circuit of the front knife opening and closing valve group / rear knife opening and closing valve group, the two working oil ports of the three-position four-way solenoid reversing valve 9 with O-type mid-position function are connected to the A2 and B2 / A3 and B3 working oil circuits respectively through the working oil channels, and two buffer oil suction valves are provided in the buffer oil suction valve group 6, and the outlets of the two buffer oil suction valves are connected to the outlets of the front knife opening and closing valve group / rear knife opening and closing valve group The return oil circuit is connected, and the inlets of the two buffer oil suction valves are respectively connected to the two working oil circuits of the front knife opening and closing valve group / rear knife opening and closing valve group; the buffer oil suction valve group 6 serves to limit the working pressure and protect the front claw knife oil cylinder / rear claw knife oil cylinder, and the superimposed one-way valve 7 can prevent oil leakage. The three-position four-way electromagnetic reversing valve 9 with the O-type neutral function controls the direction and on-off of the working oil circuits A2 and B2 / A3 and B3, thereby controlling the operation of the front claw knife oil cylinder / rear claw knife oil cylinder. Because the O-type function ensures that the three-position four-way electromagnetic reversing valve 9 with the O-type neutral function is not energized, the working oil circuits A2 and B2 / A3 and B3 are cut off, and the superimposed electric proportional pressure reducing valve controls the pressure. By presetting the current values of the input electric proportional pressure reducing valves corresponding to multiple different tree types in the controller program, the clamping pressure of the front claw knife / rear claw knife is adjusted.

[0035] The tilting valve group includes: a superimposed pressure reducing valve 10, a superimposed check valve 7, a buffer oil suction valve group 6 and a three-position four-way solenoid reversing valve 11 with a Y-type neutral position function. Since the tilting pressure does not need to be adjusted as frequently as the clamping pressure of the front claw knife, the rear claw knife and the feed roller, the superimposed pressure reducing valve 10 with an adjusting screw mechanical pressure adjustment structure is used to control the pressure. The inlet of the superimposed pressure reducing valve 10 is connected to the oil branch line of the valve block 5P port through the oil inlet oil circuit of the tilting valve group, and the outlet of the superimposed pressure reducing valve 10 is connected to the inlet of the three-position four-way solenoid reversing valve 11 with a Y-type neutral position function through the superimposed check valve 7. The return oil port of the three-position four-way solenoid reversing valve 11 with the Y-type neutral position function is connected to the T-port return oil circuit on the valve block 5 through the return oil circuit of the tilting valve group. The two working ports of the three-position four-way solenoid reversing valve 11 are respectively connected to the working oil circuits A4 and B4 on the valve block 5 through the working oil circuit of the tilting valve group. Two buffer oil suction valves are provided in the buffer oil suction valve group 6. The outlets of the two buffer oil suction valves are connected to the return oil circuit of the tilting valve group. The inlets of the two buffer oil suction valves 6 are respectively connected to the two working oil circuits A4 and B4 of the tilting valve group; the superimposed pressure reducing valve 10 controls the pressure, and the buffer oil suction valve group 6 plays a role in limiting the working pressure to protect the tilting cylinder. The superimposed one-way valve 7 can prevent oil cross-contamination. The three-position four-way solenoid reversing valve 11 with a Y-type mid-position function plays a role in controlling the direction of the working oil circuits A4 and B4. Due to the Y-type function, the working oil circuits A4 and B4 are divided into return oil circuits through the T port when power is off, which can meet the floating working condition requirements of the tilting mechanism.

[0036] The saw blade feed valve group includes: a superimposed pressure reducing valve 10, a superimposed check valve 7, and a two-position four-way electromagnetic reversing valve 12. The inlet of the superimposed pressure reducing valve 10 is connected to the oil branch of the valve block 5P port through the oil inlet oil circuit of the saw blade feed valve group. The outlet of the superimposed pressure reducing valve 10 is connected to the inlet of the two-position four-way electromagnetic reversing valve 12 through the superimposed check valve 7. The return oil port of the two-position four-way electromagnetic reversing valve 12 is connected to the T-port return oil circuit on the valve block 5 through the return oil circuit of the saw blade feed valve group. The two working ports of the two-position four-way electromagnetic reversing valve 12 are respectively connected to the working oil on the valve block 5 through the working oil circuit of the saw blade feed valve group. Roads A5 and B5 are connected, and the superimposed pressure reducing valve 10 controls the pressure. The superimposed check valve 7 can prevent oil leakage. In order to keep the saw blade retracted in the felling machine when not working to ensure operation safety, a three-position four-way solenoid valve is not used. Instead, a two-position four-way solenoid directional valve 12 is used to control the direction of the working port oil roads A5 and B5. When energized, the two-position four-way solenoid directional valve 12 works in the left position, controlling the saw blade to swing outward for cutting operations. When de-energized, the two-position four-way solenoid directional valve 12 works in the right position, controlling the saw blade to remain retracted, preventing safety hazards caused by the saw blade not being fully retracted.

[0037] The rotary valve group includes: a buffer oil suction valve group 6, a three-position four-way proportional reversing valve 13, and the inlet of the three-position four-way proportional reversing valve 13 is connected to the oil branch of the valve block 5P port through the oil inlet oil circuit of the rotary valve group. The return oil port of the three-position four-way proportional reversing valve 13 is connected to the T-port return oil circuit on the valve block 5 through the return oil circuit of the rotary valve group. The two working ports of the three-position four-way proportional reversing valve 13 are respectively connected to the working oil circuits A6 and B6 on the valve block 5 through the working oil circuit of the rotary valve group. Two buffer oil suction valves are provided in the buffer oil suction valve group 6. The outlet of each buffer oil suction valve is connected to the return oil circuit of the rotary valve group, and the inlets of the two buffer oil suction valves are respectively connected to the two working oil circuits A6 and B6 of the rotary valve group; the buffer oil suction valve group 6 plays the role of limiting the working pressure to protect the rotary motor, and the three-position four-way proportional reversing valve 13 can not only control the direction of the working oil circuits A6 and B6, but also control the current input into the three-position four-way proportional reversing valve 13 to control the output flow of the working oil circuit, thereby realizing precise control of the rotary speed of the machine and flexibly adjusting the posture of the machine in the woodland terrain.

[0038] The length measuring sensor roller retractable valve group includes: a superimposed pressure reducing valve 10 and a two-position four-way solenoid reversing valve 12. The inlet of the superimposed pressure reducing valve 10 is connected to the oil branch of the valve block 5P port through the oil inlet oil circuit of the length measuring sensor roller retractable valve group. The outlet of the superimposed pressure reducing valve 10 is connected to the inlet of the two-position four-way solenoid reversing valve 12. The return oil port of the two-position four-way solenoid reversing valve 12 is connected to the T-port return oil circuit on the valve block 5 through the return oil circuit of the length measuring sensor roller retractable valve group. The two working ports of the two-position four-way solenoid reversing valve 12 are connected to the oil branch of the valve block 5 through the oil inlet oil circuit of the length measuring sensor roller retractable valve group. The working oil circuit of the length sensor roller retraction and extension valve group is connected to the working oil circuits A7 and B7 on the valve block 5. The superimposed pressure reducing valve 10 controls the pressure. During the wood feeding working condition, the two-position four-way electromagnetic reversing valve 12 is energized and works in the left position, and the length measuring sensor roller is lowered to fit the bark surface. As the wood moves, the length measuring sensor roller rotates to calculate the wood feeding length and realize fixed-length cutting; during other working conditions, the two-position four-way electromagnetic reversing valve 12 is not energized and works in the right position, and the length measuring sensor roller is retracted to prevent the length measuring sensor from accumulating error values.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A main valve for logging equipment integrating multiple functions, characterized in that: include: Main integrated valve group, load sensing valve group, buffer integrated valve group, two-way flow valve, valve block, roller clamping valve group, front knife opening and closing valve group, rear knife opening and closing valve group, tilting valve group, saw blade feed valve group, rotary valve group, length measuring sensor roller retraction and extension valve group, The two-way flow valve is installed on the main integrated valve group, and the outlet of the two-way flow valve is connected to the chain saw motor. The main integrated valve group controls the on-off of the oil supply line to the two-way flow valve, thereby controlling the start and stop of the chain saw motor connected to the outlet of the two-way flow valve. The two load-sensing valves are installed on the main integrated valve group, and each load-sensing valve is connected to a feed roller motor. The two feed rollers are precisely and synchronously controlled by the two load-sensing valves, so that the speeds of the two feed roller motors remain the same and are not affected by the load. The buffer integrated valve group is installed on one of the load-sensing valve groups. The buffer integrated valve group is used to limit the main oil circuit pressure of the P port of the main integrated valve group of the felling machine and provide external pilot oil for other valves. The main integrated valve group, roller clamping valve group, front knife opening and closing valve group, rear knife opening and closing valve group, tilting valve group, saw blade feed valve group, rotary valve group, and length measuring sensor roller retraction and extension valve group are installed on the valve block, and the valve block serves to communicate the main integrated valve group and the roller clamping valve group, front knife opening and closing valve group, rear knife opening and closing valve group, tilting valve group, saw blade feed valve group, rotary valve group, and length measuring sensor roller retraction and extension valve group.

2. A main valve for logging equipment integrating multiple functions according to claim 1, characterized in that: The main integrated valve group is provided with a pressure reducing valve A of the main valve of the logging tool, a main solenoid valve, a P-port main oil circuit, a T-port return oil circuit, a Dr oil drain port oil circuit and corresponding pressure measuring joints for troubleshooting. The inlet of the pressure reducing valve A is connected to the P-port main oil circuit, the outlet of the pressure reducing valve A is connected to two load-sensitive valves respectively, the oil drain port of the pressure reducing valve A is connected to the Dr oil drain port oil circuit, the inlet of the main solenoid valve is connected to the P-port main oil circuit, and the outlet of the main solenoid valve is connected to the inlet of the two-way flow valve. The on-off of the oil supply circuit to the two-way flow valve is controlled by controlling the power on and off of the main solenoid valve, thereby controlling the start and stop of the chain saw motor connected to the outlet V of the two-way flow valve.

3. A main valve for logging equipment integrating multiple functions according to claim 2, characterized in that: The load-sensitive valve group is provided with a main valve core, a pressure compensation valve, a pilot solenoid valve, a buffer oil suction valve A, a working oil circuit A, a working oil circuit B and corresponding pressure measuring oil circuit a and pressure measuring oil circuit b for troubleshooting. The load-sensitive valve group is connected to the feed roller motor through the oil ports on the working oil circuit A and the working oil circuit B. The inlet of the pressure compensation valve is connected to the P-port main oil circuit of the main integrated valve group, and the outlet of the pressure compensation valve is connected to the inlet on the main valve core. The pressure compensation valve is used to keep the inlet and outlet pressure difference of the main valve core constant. When the main valve core is in the working position, the outlet of the main valve core is connected to the working oil circuit A or the working oil circuit B, and the return oil circuit of the main valve core is connected to the T-port return oil circuit of the main integrated valve group. The main valve core is used to control the on and off of the working oil circuit A and the working oil circuit B. The outlet of the main valve core The feedback oil circuit is connected to the pressure measuring oil circuit a and the pressure measuring oil circuit b. The two buffer oil suction valves A are arranged on the working oil circuit A and the working oil circuit B. The outlet of the buffer oil suction valve A is connected to the T-port return oil circuit of the main integrated valve group. The buffer oil suction valve A is used to limit the working port pressure to protect the motor and replenish oil to the motor to prevent air suction; the inlets of the two pilot solenoid valves are connected to the outlet of the pressure reducing valve A in the main integrated valve group. The pressure reducing valve A in the main integrated valve group can provide a pilot oil source for the pilot solenoid valve. The outlets of the two pilot solenoid valves are respectively connected to the two sides of the main valve core. The movement stroke of the main valve core is controlled by the pilot solenoid valve, thereby controlling the output flow rate of the working port. The oil drain ports of the pilot solenoid valves on the two load-sensitive valve groups are connected to the Dr oil drain port oil circuit.

4. A main valve for logging equipment integrating multiple functions according to claim 3, characterized in that: The buffer integrated valve group is provided with a buffer oil suction valve B, a pressure reducing valve B and an oil port C for providing external pilot oil to other valves. The inlet and outlet of the buffer oil suction valve B are respectively connected to the P-port main oil circuit and the T-port return oil circuit in the main integrated valve group through the oil channel in the load-sensitive valve group. The inlet of the pressure reducing valve B is connected to the inlet of the buffer oil suction valve B, and the outlet of the pressure reducing valve B is connected to the C oil port, which can provide external pilot oil to other valves. The oil drain port of the pressure reducing valve B is connected to the outlet of the buffer oil suction valve B, and the pressure of the main oil circuit of the P port of the main valve of the logging machine is limited by the buffer oil suction valve B.

5. A main valve for a logging machine with multiple functions according to claim 4, characterized in that: The C oil port is connected to the pilot oil source port of the sawtooth lubrication valve of the felling machine to supply oil to it, so as to drive the piston movement of the sawtooth lubrication valve to realize the chain lubrication function.

6. The main valve for logging equipment integrating multiple functions according to claim 2, characterized in that: The valve block is provided with a P-port oil branch circuit, a T-port oil return circuit, and seven groups of working oil circuits. The seven groups of working oil circuits are A1 and B1, A2 and B2, A3 and B3, A4 and B4, A5 and B5, A6 and B6, A7 and B7; the P-port oil branch circuit and the T-port oil return circuit in the valve block are respectively connected to the P-port main oil circuit and the T-port oil return circuit in the main integrated valve group, and are respectively connected to the oil inlet and return circuits in the roller clamping valve group, the front knife opening and closing valve group, the rear knife opening and closing valve group, the tilting valve group, the saw blade feed valve group, the rotary valve group, and the length measuring sensor roller retraction and extension valve group through the P-port oil branch circuit and the T-port oil return circuit. The roller clamping valve group, the front knife opening and closing valve group, and the rear knife opening and closing valve group are respectively connected to the three groups of working oil circuits A1 and B1, A2 and B2, and A3 and B3. The oil ports on the three groups of working oil circuits 1 and B1, A2 and B2, A3 and B3 are connected to the roller clamping cylinder, the front claw knife cylinder and the rear claw knife cylinder respectively; the tilting valve group is connected to the working oil circuits A4 and B4, the oil ports on the working oil circuits A4 and B4 are connected to the tilting cylinder to control the tilting function; the saw blade feed valve group is connected to the working oil circuits A5 and B5, the oil ports on the working oil circuits A5 and B5 are connected to the saw blade feed cylinder to control the saw blade feeding function; the rotary valve group is connected to the working oil circuits A6 and B6, the oil ports on the working oil circuits A6 and B6 are connected to the rotary motor to control the rotation function of the felling machine; the length measuring sensor roller retraction and extension valve group is connected to the working oil circuits A7 and B7, the oil ports on the working oil circuits A7 and B7 are connected to the retraction and extension cylinder to control the feed function of the length measuring sensor.

7. A main valve for logging machinery integrating multiple functions according to claim 6, characterized in that: The roller clamping valve group, front knife opening and closing valve group, and rear knife opening and closing valve group all include: a buffer oil suction valve group, a superimposed one-way valve, a superimposed electric proportional pressure reducing valve, and an O-type neutral position function three-position four-way electromagnetic reversing valve. The buffer oil suction valve group serves to limit the working pressure and protect the roller clamping oil cylinder / front claw knife oil cylinder / rear claw knife oil cylinder. The superimposed one-way valve can prevent oil leakage. The three-position four-way electromagnetic reversing valve with an O-type neutral position function controls the direction and on-off of the working oil circuit. Since the O-type function ensures that the working oil circuit is cut off when the three-position four-way electromagnetic reversing valve is not energized, the superimposed electric proportional pressure reducing valve controls the pressure. By controlling the current value input to the superimposed electric proportional pressure reducing valve, the clamping pressure of the front claw knife, rear claw knife and feed roller is adjusted.

8. The main valve for logging equipment integrating multiple functions according to claim 6, characterized in that: The tilting valve group includes: a superimposed pressure reducing valve, a superimposed check valve, a buffer oil suction valve group and a three-position four-way electromagnetic reversing valve with a Y-type mid-position function. The superimposed pressure reducing valve controls the pressure of the working oil circuits A4 and B4. The buffer oil suction valve group limits the working pressure to protect the tilting cylinder. The superimposed check valve can prevent oil leakage. The three-position four-way electromagnetic reversing valve with a Y-type mid-position function controls the direction of the working port oil circuit. Due to the Y-type function, the working oil circuits A4 and B4 are connected to the T-port return oil circuit when power is off, which can meet the floating working condition requirements of the tilting valve group.

9. The main valve for logging equipment integrating multiple functions according to claim 6, characterized in that: The saw blade feed valve group includes: a superimposed pressure reducing valve, a superimposed check valve, and a two-position four-way electromagnetic reversing valve. The superimposed pressure reducing valve controls the pressure of the working oil circuits A5 and B5, the superimposed check valve can prevent oil cross-contamination, and the two-position four-way electromagnetic reversing valve controls the direction of the working oil circuit, thereby controlling the saw blade to swing outward for cutting operations or to control the saw blade to remain in the retracted state.

10. The main valve for logging equipment integrating multiple functions according to claim 6, characterized in that: The rotary valve group includes: a buffer oil suction valve group and a three-position four-way proportional reversing valve. The buffer oil suction valve group serves to limit the working pressure and protect the rotary motor. The three-position four-way proportional reversing valve can not only control the direction of the working oil circuits A6 and B6, but also control the output flow of the working oil circuit by controlling the current input to the three-position four-way proportional reversing valve, thereby achieving precise control of the rotary speed of the machine. The length measuring sensor roller retraction and extension valve group includes: a superimposed pressure reducing valve and a two-position four-way electromagnetic reversing valve. The superimposed pressure reducing valve controls the pressure of the working oil circuits A7 and B7, and the two-position four-way electromagnetic reversing valve controls the extension or retraction of the length measuring sensor roller.

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