CN210808161U

CN210808161U - Full-automatic transplanting combined operation machine planting unit lifting control equipment

Info

Publication number: CN210808161U
Application number: CN201920885098.1U
Authority: CN
Inventors: 汤庆; 吴俊�; 吴崇友; 张敏; 王刚; 蒋兰
Original assignee: Nanjing Research Institute for Agricultural Mechanization Ministry of Agriculture
Current assignee: Nanjing Research Institute for Agricultural Mechanization Ministry of Agriculture
Priority date: 2019-06-13
Filing date: 2019-06-13
Publication date: 2020-06-23
Anticipated expiration: 2029-06-13

Abstract

The utility model discloses a full-automatic combined operation machine of transplanting unit lift control equipment that plants, including promotion hydro-cylinder and ground profile modeling system, the promotion hydro-cylinder is connected with hydraulic system, is equipped with the valves on the connecting pipe way of promotion hydro-cylinder and hydraulic system, and the valves is fixed on the installing support, its characterized in that: the ground profiling system comprises a profiling mechanism and a transmission mechanism; the profiling mechanism comprises an induction wheel, a movable support and a fixed support, and the transmission mechanism comprises a pull wire, a movable lug, a pull lug and the like. The utility model discloses a full-automatic combined operation machine of transplanting unit lift control equipment that plants, implement active control based on passive response, compare in current active control profile modeling system, make and use cost are low, easy to maintain to operating condition operates steadily, and compare in current passive profile modeling system, through the structure preferred, can reduce the vibrations that the topography sudden change transmitted on the unit of planting, avoid mechanical damage, have better profile modeling effect simultaneously.

Description

Full-automatic transplanting combined operation machine planting unit lifting control equipment

Technical Field

The invention relates to the technical field of agricultural machinery, in particular to a lifting control device for a planting unit of a full-automatic transplanting combined machine.

Background

During the working process of the combined operation machine, the ground contacted with the planting unit is generally smoother through the soil turning and shaping of the front mechanism, but in order to prevent accidents, the raised ground surface is prevented from causing collision damage to the planting mechanism; or in order to adapt to the ground with gradient change and make the planting depth of the nursery stock consistent, the existing combined operation machine is provided with a ground profiling system, so that the height of the planting unit changes along with the terrain, thereby ensuring the safe operation of the operation machine and improving the operation quality.

The profiling system of the existing agricultural machine comprises passive adjustment (passive induction and profiling control) and active adjustment (active induction and active control), most of combined working machines for implementing the passive adjustment are provided with a terrain sensing device connected with a working mechanism, the terrain sensing device supports the working mechanism, so that the working mechanism can generate height change along with terrain, but the sensing device is generally rigidly connected with the working mechanism, can directly transmit vibration generated by the terrain change, is easy to damage the machine, and has low profiling precision; in general, a combined operation machine for implementing active adjustment actively acquires terrain information through a plurality of sensors, a control system analyzes the terrain by combining feedback data of the sensors and then controls a driving device to adjust the height of an operation mechanism, but in field operation, precise devices in an open space are not easy to maintain, and the implementation mode has high manufacturing and maintenance cost.

Disclosure of Invention

Aiming at the problems in the prior art, the technical purpose of the invention is to provide a novel lifting control device of a planting unit of a full-automatic transplanting combined machine, which implements active control based on passive induction, has safe and stable operation, is not easy to damage machinery and has low manufacturing and using cost.

The technical scheme of the invention is as follows:

the utility model provides a full-automatic combined operation machine of transplanting unit lift control equipment, includes lifting cylinder and ground profile modeling system, lifting cylinder and hydraulic system are connected, are equipped with the valves on lifting cylinder and hydraulic system's the connecting pipeline, and the valves is fixed on the installing support, its characterized in that:

the ground profiling system comprises a profiling mechanism and a transmission mechanism;

profiling mechanism includes inductive wheel, movable support and fixed bolster:

the induction wheel is in a roller shape, is transversely arranged and is in contact with the ground when in work, and two ends of the induction wheel are arranged at the bottom of the movable bracket through a first rotating shaft;

the movable support is obliquely arranged in a mode that the upper part faces forwards and the lower part faces backwards, and the middle part of the movable support is hinged with the bottom of the fixed support through a second rotating shaft;

the fixed bracket is positioned behind the movable bracket and forms an included angle with the upper part of the movable bracket, the top end of the fixed bracket is fixed on a bracket main beam of the planting unit, and the fixed bracket is provided with a fixed lug;

in the profiling mechanism, the first rotating shaft is parallel to the second rotating shaft, and the front direction indicates the advancing direction of the combined operation machine;

the transmission mechanism comprises a pull wire, a movable lug and a pull lug:

the valve group is provided with a shell, a valve core and a push rod, the valve group controls the operation of the lifting oil cylinder through the action of the valve core, one end of the push rod is connected with the valve core in the shell, the other end of the push rod extends out of the shell, and the part of the push rod extending out of the shell is provided with a first reset spring;

the pull lug is arranged on one side, extending out, of the push rod of the valve group and is hinged with the mounting bracket through a third rotating shaft, and the third rotating shaft is vertical to the push rod; one end of the pull lug is connected with the mounting bracket through a second reset spring, the other end of the pull lug is connected with the movable bracket through a pull wire to form a lever structure taking a third rotating shaft as a fulcrum, the second reset spring is parallel to the push rod, and a circular arc-shaped protruding contact is arranged between the connecting point of the pull lug and the pull wire and the third rotating shaft and is arranged at a position aligned with the end part of the push rod;

the pull wire comprises a sleeve and a pull wire positioned in the sleeve, and the length of the pull wire is greater than that of the sleeve and can move in the sleeve; one end of the sleeve is fixedly connected with the movable lug, and the other end of the sleeve is fixedly connected with the fixed lug; one end of the wire drawing penetrates through the back of the movable lug to be connected with the pull lug, the other end of the wire drawing penetrates through the back of the fixed lug to be connected with the upper part of the movable support, and through holes for the wire drawing to penetrate through are formed in the fixed lug and the movable lug;

when the ground is provided with a bulge, the induction wheel is lifted upwards, the movable support rotates, the pull lug is linked through wire drawing, the first return spring is compressed, the second return spring is stretched, the pull lug extrudes the push rod of the valve group through the bulge contact, the valve core is driven to move, and an oil way for driving the lifting oil cylinder to perform lifting action is conducted; after the induction wheel crosses the bulge, the valve core is reset under the action of the first reset spring, and an oil way for driving the lifting oil cylinder to perform lifting action is closed; and under the action of a second return spring, the pull lug is reset.

On the basis of the above scheme, a further improved or preferred scheme further comprises:

the drawing wire is connected with the movable support through a buffer spring.

The movable lug is arranged on the mounting bracket through the waist-shaped long hole, and the relaxation state of the drawn wire is changed by adjusting the fixed position of the movable lug in the waist-shaped long hole so as to adjust the induction sensitivity of the control mechanism.

The fixed lug and the movable lug are provided with openings communicated with the through hole, and the drawn wires are placed into the through hole through the openings.

The movable lug comprises a positioning part and a limiting part, wherein the positioning part is T-shaped and consists of a flange disc and a screw fixed on one side of the flange disc; the limiting part is fixed on the other side of the flange disc and is provided with the through hole and the opening, and the axis of the through hole is vertical to the axis of the screw rod; when the movable lug is installed, the screw rod is inserted into the waist-shaped long hole until the flange plate is abutted on the surface of the installation support, and the screw rod is locked from the other side of the waist-shaped long hole by adopting a nut.

The upper part of the movable support is provided with a plurality of positioning holes at different height positions, the positioning holes are matched with the adjustable rod for use, one end of the buffer spring is hung on the adjustable rod, and the adjustable rod is arranged in the positioning holes at different height positions to adjust the profile modeling height of the planting unit.

The induction wheel is a rubber covered wheel and consists of a middle shaft sleeve and an external rubber wheel, and the external rubber wheel is a hollow rubber wheel.

The lifting oil cylinder is a single-action hydraulic cylinder, an oil delivery port is arranged on one side of a rod cavity of the lifting oil cylinder, oil is fed into the rod cavity, and then a piston rod moves to drive the transplanting unit to ascend.

On the basis that the lifting oil cylinder is a single-action hydraulic cylinder, the valve group adopts a five-position four-way reversing valve, and is provided with A, B, P, T four oil ports and five valve positions, wherein the five valve positions are respectively 1 position, 2 position, middle position, 3 position and 4 position, when the valve core moves to the 1 position, the A is communicated with the P oil port, and the B is communicated with the T oil port through a throttling channel; when the valve core moves to the 2 position, the oil port A is communicated with the oil port P through the throttling channel, and the oil port B is communicated with the oil port T; when the valve core moves to the middle position, the oil port A and the oil port B are both blocked, and the oil port P is communicated with the oil port T; when the valve core moves to the 3 position, the oil ports A and B are communicated through the throttling channel, and the oil ports P and T are communicated; when the valve core moves to the 4 position, the oil port A is communicated with the oil port B, and the oil port P is communicated with the oil port T through a throttling channel;

the hydraulic system comprises an oil tank, an overflow valve and an unloading valve, wherein a P oil port of the valve group is connected with the oil tank through a first oil pipeline, and an oil pump is arranged in the first oil pipeline; the oil port A is connected with an oil delivery port of a rod cavity of the lifting oil cylinder through a second oil delivery pipeline; the oil port B is connected with an oil tank through a first oil return pipeline; the T oil port is connected to the first oil return pipeline through a second oil return pipeline, and the connecting point of the T oil port is S; the overflow valve and the unloading valve are merged into a loop of the hydraulic system through a first branch pipeline, the first branch pipeline is arranged between a connection point S and a port of a second oil return pipeline, the connection points of two ends of the first branch pipeline and the first oil return pipeline are respectively M and N, in the first oil return pipeline, the connection point M is positioned at the upstream of the connection point N, the first branch pipeline and the first oil conveying pipeline have a crossing point O, the overflow valve is arranged in a pipeline between the connection point M and the crossing point O, and the unloading valve is arranged in a pipeline between the crossing point O and the connection N at the other side of the crossing point O; the input end of the unloading valve is connected with the second oil pipeline through a second branch pipeline.

Furthermore, the full-automatic transplanting combined machine planting unit lifting control equipment is provided with an electric cylinder and a lifting control handle. The electric cylinder is arranged in front of the valve group, an output shaft of the electric cylinder is parallel to a push rod of the valve group, the end part of the output shaft of the electric cylinder is positioned beside the pull lug and is also aligned to the front end face of the push rod, and the electric cylinder can push the push rod of the valve group to drive the valve core to switch valve positions; the signal input end of the electric cylinder is connected with the control system, the signal input end of the control system is connected with the lifting control handle, the stroke of the output shaft of the electric cylinder is controlled by operating the lifting control handle, and the position of a valve core of the valve group is switched.

Has the advantages that:

the full-automatic transplanting combined machine planting unit lifting control equipment implements active control based on passive induction, has low manufacturing and using cost, is easy to maintain and operates stably in a working state compared with the conventional active control profiling system, can reduce the vibration transmitted to the planting unit by sudden change of the terrain through structure optimization compared with the conventional passive profiling system, avoids mechanical damage and has a better profiling effect.

Drawings

FIG. 1 is a schematic diagram of the configuration of a profiling system of the present invention;

FIG. 2 is a cross-sectional view of a sensor wheel;

FIG. 3 is a schematic view of the structure of the movable ear;

FIG. 4 is a schematic structural view of a movable support;

FIG. 5 is a schematic structural view of a fixing bracket;

FIG. 6 is a schematic structural view of a control mechanism;

FIG. 7 is a schematic structural view of a planting unit and a profiling mechanism;

FIG. 8 is a schematic illustration of a configuration of a combined operation machine;

FIG. 9 is a schematic view of a valve spool position;

fig. 10 is a schematic diagram of a piping structure of the hydraulic system.

Detailed Description

In order to clarify the technical solution and the working principle of the present invention, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.

The combined transplanter as shown in fig. 8 comprises a tractor, a frame, and a hydraulic system, a seedling frame, a rotary tillage and ditching system, a transplanting system, a soil covering and compacting system and the like which are arranged on the frame. The frame is connected with a tractor through a three-point suspension mechanism and is driven by the tractor to pull. The transplanting system is provided with more than one transplanting unit, each transplanting unit is movably connected with the rack through a pair of independent parallel four-bar copying mechanisms, and meanwhile, the transplanting system is provided with a lifting oil cylinder 12 for independently controlling the transplanting units to lift.

The lifting of the transplanting unit is divided into manual control and automatic control, wherein the manual control means that a person sends an instruction to a control system through an operation platform to drive the lifting oil cylinder 12 to act so as to control the transplanting unit to ascend or descend; the automatic control means that the ground profiling system drives the lifting oil cylinder to act, so that the transplanting unit can lift along with the terrain.

The lifting cylinder 12 is a single-acting hydraulic cylinder, and is provided with an oil inlet of a cavity (hereinafter referred to as a rod cavity) on one side of a piston rod, and the piston rod is connected with the transplanting unit. The oil delivery port of the lifting cylinder 12 is connected with a hydraulic system, the hydraulic system provides oil pressure for driving the lifting cylinder 12 to move, a valve set 910 is arranged on a connecting pipeline between the lifting cylinder 12 and the hydraulic system, the valve set 910 is mounted on a mounting bracket 909, and the mounting bracket 909 is fixedly connected with a mounting platform provided by a frame.

The valve set 910 includes a housing, a valve core, and a push rod disposed longitudinally, the rear end of the push rod is connected to the valve core in the housing, and the front end of the push rod extends out of the valve body. The part of the push rod extending out of the valve body is provided with a first return spring, the first return spring is sleeved on the push rod, the rear end of the first return spring is abutted against the shell of the valve group 910, and the front end of the first return spring is abutted against a flange at the end part of the push rod or is fixedly connected with the push rod in other modes, so that the compressed first return spring can push the push rod forwards when the first return spring is reset. As shown in fig. 9 and 10, in the embodiment, the valve set 910 is a five-position four-way reversing valve, which has A, B, P, T four oil ports, and five passages can be formed by shifting the valve core in five valve positions. The five valve positions are respectively 1 position, 2 position, middle position, 3 position and 4 position, when the valve core moves to the 1 position, the oil port A is normally communicated with the oil port P, and the oil port B is communicated with the oil port T through a throttling channel (a channel provided with a throttling valve); when the valve core moves to the 2 position, the oil port A is communicated with the oil port P through the throttling channel, and the oil port B is normally communicated with the oil port T; when the valve core moves to the middle position, the oil port A and the oil port B are both blocked, and the oil port P is communicated with the oil port T; when the valve core moves to the 3 position, the oil ports A and B are communicated through the throttling channel, and the oil ports P and T are normally communicated; when the valve core moves to the 4 position, the oil ports A and B are normally communicated, and the oil ports P and T are communicated through the throttling channel.

The ground profiling system comprises a profiling mechanism and a transmission mechanism.

The profiling mechanism comprises a sensing wheel 901, a movable bracket 902, a fixed bracket 904 and the like.

The sensing wheel 901 is a rubber covered wheel, is in a roller shape, and is composed of a middle shaft sleeve 901.2 and an external rubber wheel 901.1, and the external rubber wheel 901.1 is a hollow rubber wheel. The sensing wheel 901 is transversely arranged, and is in contact with the ground during working, and rolls on the ground to sense the change of the terrain. The first shaft passes through the intermediate sleeve 901.2, and both ends are positioned in the intermediate sleeve 901.2 by bearings.

As shown in fig. 1 and 8, the movable stand 902 is disposed obliquely with the upper portion facing forward and the lower portion facing backward (the forward direction refers to the traveling direction of the combined machine, and the rearward direction refers to the direction opposite to the traveling direction). The lower part of the movable bracket 902 is provided with a roller fork, and the bottom ends of two arms of the roller fork are provided with groove-shaped shaft holes 902.1. During installation, two arms of the roller fork are clamped at two ends of the first rotating shaft extending out of the middle shaft sleeve 901.2 through the groove-shaped shaft holes 902.1 and then are locked and fixed through nuts. Two positioning rods consistent with the extending direction of the roller fork are arranged at the upper part of the movable support 902, a plurality of positioning holes at different height positions are arranged on the positioning rods, shaft holes are arranged at the lower parts of the positioning rods, and the two positioning rods are identical in structure. The middle part of the movable support 902 is hinged with the bottom of the fixed support 904 through a second rotating shaft, the second rotating shaft is parallel to the first rotating shaft, and two ends of the second rotating shaft are arranged in shaft holes corresponding to the two positioning rods.

The fixed bracket 904 is located behind the movable bracket, and the structure thereof is as shown in fig. 5, and includes two support rods, which are connected by a cross beam to reinforce the connection structure. As shown in fig. 1, the fixed bracket 914 is also disposed obliquely, with its upper portion facing backward and its lower portion facing forward, forming an included angle with the upper portion of the movable bracket 902. The top end of the fixed support 904 is fixed on a support main beam of the planting unit, a fixed lug 903 is arranged on a cross beam of the fixed support 904, the fixed lug 903 is provided with a through hole and a notch communicated with the through hole, and a drawn wire is placed into the through hole through the notch.

The transmission mechanism comprises a pull wire 907, a movable lug 908 and a pull lug 911, the movable lug 908 and the pull lug 911 are respectively installed on the installation support 909, and the installation support 909 is located obliquely above the front side of the profiling mechanism.

The pull tab 911 is disposed in front of the valve set 910 and hinged to the mounting bracket 909 through a third rotating shaft, and the third rotating shaft is disposed horizontally and perpendicular to the valve set push rod. The top end of the pull lug 911 is connected to the mounting bracket 909 through a second return spring 912, and the bottom end is connected to the movable bracket 902 through a pull wire 907, so as to form a lever structure with the third rotating shaft as a fulcrum. The second return spring 912 is parallel to the push rod, and a circular arc-shaped convex contact is arranged between the connecting point of the pull lug 911 and the pull wire 907 and the third rotating shaft and is arranged at a position aligned with the front end of the push rod.

The pull wire 907 includes a sleeve and a pull wire inside the sleeve, and the length of the pull wire is greater than that of the sleeve and can move inside the sleeve. One end of the sleeve is fixedly connected with the movable lug 908, and the other end is fixedly connected with the fixed lug 903. One end of the wire drawing penetrates through the movable lug 908 and then is connected with the pull lug 911, the other end of the wire drawing penetrates through the fixed lug 903 and is connected with one end of the buffer spring 905, the other end of the buffer spring 905 is hung on the adjustable rod 906, and the adjustable rod 906 is matched with the positioning hole in the fixing support 904 for use. By mounting the adjustable rods 906 in the positioning holes at different height positions and adjusting the inclination angle of the movable bracket 902, the profile height of the planting unit, i.e. the distance between the planting unit and the ground, can be changed.

The movable lug 908 is mounted on the mounting bracket 909 through a long waist-shaped hole, which is located obliquely below the rear side of the valve block 910 and is longitudinally arranged at the same level as the bottom end of the pull lug 911, as shown in fig. 1. By adjusting the fixed position of the movable lug 908 in the waist-shaped long hole, the path of the drawn wire can be changed, so that the relaxation state of the drawn wire is changed, and the induction sensitivity of the drawing lug is adjusted.

The movable ear 908 includes a positioning portion and a restraining portion. The positioning part is T-shaped and consists of a flange disc and a screw fixed on one side of the flange disc, the limiting part is fixed on the other side of the flange disc and is provided with a through hole and an opening communicated with the through hole, and the drawn wire is placed into the through hole through the opening. When the movable lug is installed 908, the screw is inserted into the oblong hole, which is a through hole, and the screw is locked from the other side of the oblong hole using a nut, until the flange rests on the surface of the mounting bracket 909. The longitudinal axis of the through hole of the limiting part is vertical to the transverse axis of the screw rod.

The hydraulic system includes a tank 1001, a filter 1002, an oil pump 1003, a relief valve 1004, an unloading valve 1005, and a throttle 1006. The P oil port of the valve group 910 is connected with the oil tank 1001 through a first oil pipeline, the oil pump 1003 is installed in the first oil pipeline, and the filter 1002 is installed between the inlet of the oil pump 1003 and the oil tank 1001. The oil port A is connected with an oil delivery port of a rod cavity of the lifting oil cylinder 12 through a second oil delivery pipeline, and a stop valve 1007 is installed in the second oil inlet pipeline. The oil port B is connected with an oil tank 1001 through a first oil return pipeline, and an adjustable throttle valve 1006 is installed in the first oil return pipeline. The oil port T is connected to the first oil return pipeline through a second oil return pipeline, the connection point of the oil port T is S, and the adjustable throttle valve 1006 is located between the connection point S and the oil port B. The relief valve 1004 and the relief valve 1005 are incorporated into the circuit of the hydraulic system through a first branch line provided between the connection point S and the port of the second return line. The connection points of the two ends of the first branch pipeline and the first oil return pipeline are respectively M and N, and the connection point M is arranged on the upstream of the connection point N on the first oil return pipeline. The first branch pipeline and the first oil pipeline have a crossing point O (the crossing point forms a four-way structure), the overflow valve 1004 is installed in the pipeline between the connecting point M and the crossing point O, and the unloading valve 1005 is installed in the pipeline between the crossing point O and the connecting point N. The output ends of the overflow valve 1004 and the unloading valve 1005 are connected with the oil tank 1001, the input end of the unloading valve 1005 is connected with the second oil delivery pipeline through a second branch pipeline, the connection point of the unloading valve 1005 and the second oil delivery pipeline is located between the stop valve 1007 and the oil port A, and a throttle valve can be selectively arranged on the second branch pipeline. The overflow valve 1004 is used for pressure control of the pipeline in which the overflow valve is located. The unloading valve 1005 is used for pressure control of the pipeline where the unloading valve is located, protecting the lifting cylinder 12 and the oil pump 1003, and preventing the lifting cylinder 12 and the oil pump 1003 from bearing excessive pressure when the transplanting unit encounters sudden rising and sudden falling conditions.

The working principle is as follows:

when the working machine is on level ground or the lifting control handle 13 is in the neutral position, the first return spring of the ground profiling system transmission is in a semi-compressed state (compressed but not compressed to the limit).

Artificial control:

an electric cylinder 11 is arranged in front of the valve group 910, an output shaft of the electric cylinder 11 is parallel to a push rod of the valve group 910, an end of the output shaft of the electric cylinder is located beside the pull lug 911 and is also aligned with a front end face of the push rod, and the electric cylinder 11 can push the push rod of the valve group 910 to drive the valve core to move.

The signal input end of the electric cylinder 11 is connected with a control system, the corresponding signal input end of the control system is connected with a lifting control handle 13 on the operating platform, and the lifting control handle 13 is provided with a plurality of gears.

When one line of nursery stock is transplanted or the machine tool needs to be lifted midway, a person shifts the lifting control handle 13 to enable the gear of the lifting control handle to be at a left lifting position, after an instruction signal sent by the lifting control handle 13 is processed by the control system, a corresponding control signal is output to the electric cylinder 11 to control the output shaft of the electric cylinder 11 to extend out, the valve core of the valve group 910 is pushed by the push rod to move backwards by a distance L, the first return spring is further compressed at the moment, the valve core moves inwards to 1 position, oil extracted from the oil tank 1001 by the oil pump 1003 is directly supplied to a rod cavity of the lifting oil cylinder 12 to push the piston rod to move forwards, and the piston rod drives the planting unit to lift through the lifting mechanism.

When the transplanting unit is lifted to a required position, the lifting control handle 13 is shifted to be at a middle pressure maintaining position, the electric cylinder 11 is controlled to retract to an L/2 distance through the control system, at the moment, the valve core moves outwards to a distance of L/2 under the action of the elastic force of the first return spring, the valve core reaches the middle position, hydraulic oil output by the oil pump 1003 directly returns to the oil tank 1001 through a PT channel of the valve core and a corresponding oil return pipeline, the oil which enters a rod cavity of the lifting oil cylinder 12 is sealed in the rod cavity, the piston rod cannot extend out or retract to be in a locking state at the moment, and the transplanting unit is in a lifting fixed state at the moment.

When the planting unit needs to be put down for planting, the lifting control handle 13 is shifted to be in a right-side descending position, an operation instruction of the lifting control handle 13 is processed by the control system, a control signal is output to the electric cylinder 12, the electric cylinder 12 is controlled to continuously retract to an L/2 distance, at the moment, the valve core continuously moves outwards by the L/2 distance under the action of the first return spring to reach a 4-position, hydraulic oil sucked by the oil pump 1003 directly returns to the oil tank 1001, oil which enters the rod cavity of the lifting oil cylinder 12 can directly return to the oil tank 1001 through a loop, the planting unit pulls the piston rod to extend outwards through gravity, and the planting unit descends.

(II) automatic control:

when the planting unit descends, the induction wheel 901 contacts the ground, the movable support 905 rotates, the pull lug 911 is driven to rotate through the drawn wire in the pull wire 907, the protruding contact of the pull lug 911 extrudes the push rod, and the valve core is forced to move towards the rear of the valve group. The height of the planting unit is at a normal position, that is, when the height of the sensing wheel 901 is a preset flat height, the valve core should move to a middle position, and the lifting cylinder 12 is in a pressure maintaining stable state.

When the ground has a protrusion, the sensing wheel 901 is lifted upwards, the movable support 902 rotates, the pull lug 911 is linked through wire drawing, the pull lug 911 rotates around the third rotating shaft, the first return spring on the push rod is compressed, the second return spring 912 is stretched, the protruding contact of the pull lug 911 moves backwards, the push rod of the valve group 910 is squeezed, the valve core is driven to move by the push rod, the valve core moves to 2 positions, oil pumped by the oil pump 1003 from the oil tank 1001 is directly supplied to a rod cavity of the lifting oil cylinder 12 to push the piston rod to move leftwards, the piston rod is connected with a lifting mechanism to drive the planting unit to lift, the induction wheel 901 moves downwards in the lifting process, the movable support 902 rotates reversely, the drawn wire is loosened, at the moment, the raised contact of the pull lug 911 moves forwards under the action of the second reset spring 912, under the pushing action of the first return spring, the valve core is restored to the middle position, and at the moment, the profiling lifting process is completed. If the ground surface is raised too high, the valve core can reach 1 position, and the 1 position is opposite to the 2 position and is not provided with a throttle valve on an oil inlet oil way, so that the lifting oil cylinder 12 can be quickly driven to lift the planting unit.

The inductive wheel 901 moves downwards after crossing the bulge, the valve core moves towards 3 positions under the action of the first return spring, the 3 positions are descending positions, and the valve core recovers to the middle position after the planting unit moves downwards to reach the normal working position. When a pit exists, the principle is similar, and the valve core moves to 3 positions at the moment and is in a descending position.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the foregoing description only for the purpose of illustrating the principles of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims, specification, and equivalents thereof.

Claims

1. The utility model provides a full-automatic combined operation machine of transplanting unit lift control equipment, includes lift cylinder (12) and ground profile modeling system, lift cylinder (12) are connected with hydraulic system, are equipped with valves (910) on lift cylinder (12) and hydraulic system's the connecting line, and valves (910) are fixed on installing support (909), its characterized in that:

the profiling mechanism comprises a sensing wheel (901), a movable bracket (902) and a fixed bracket (904):

the induction wheel (901) is in a roller shape, is transversely arranged and is in contact with the ground when in work, and two ends of the induction wheel are arranged at the bottom of the movable bracket (902) through a first rotating shaft;

the movable support (902) is obliquely arranged in a mode that the upper part faces forwards and the lower part faces backwards, and the middle part of the movable support (902) is hinged with the bottom of the fixed support (904) through a second rotating shaft;

the fixed bracket (904) is positioned behind the movable bracket, an included angle is formed between the fixed bracket (904) and the upper part of the movable bracket (902), the top end of the fixed bracket (904) is fixed on a main beam of the bracket of the planting unit, and a fixed lug (903) is arranged on the fixed bracket (904);

the transmission mechanism comprises a pull wire (907), a movable lug (908) and a pull lug (911):

the valve group (910) is provided with a shell, a valve core and a push rod, the valve group (910) controls the operation of the lifting oil cylinder (12) through the action of the valve core, one end of the push rod is connected with the valve core in the shell, the other end of the push rod extends out of the shell, and the part of the push rod extending out of the shell is provided with a first return spring;

the pull lug (911) is arranged on one side, extending out, of the push rod of the valve group (910) and is hinged with the mounting bracket (909) through a third rotating shaft, and the third rotating shaft is vertical to the push rod; one end of the pull lug (911) is connected with the mounting bracket (909) through a second return spring (912), the other end of the pull lug is connected with the movable bracket (902) through a pull wire (907) to form a lever structure taking a third rotating shaft as a fulcrum, the second return spring (912) is parallel to the push rod, an arc-shaped protruding contact is arranged between the connecting point of the pull lug (911) and the pull wire (907) and the third rotating shaft, and the protruding contact is arranged at a position aligned with the end part of the push rod;

the pull wire (907) comprises a sleeve and a pull wire positioned inside the sleeve, the length of the pull wire is greater than that of the sleeve, and the pull wire can move inside the sleeve; one end of the sleeve is fixedly connected with the movable lug (908), and the other end of the sleeve is fixedly connected with the fixed lug (903); one end of the drawing wire penetrates through the movable lug (908) and then is connected with the drawing lug (911), the other end of the drawing wire penetrates through the fixed lug (903) and then is connected with the upper part of the movable support (902), and through holes for the drawing wire to penetrate through are formed in the fixed lug (903) and the movable lug (908);

when the ground is raised, the induction wheel (901) is lifted upwards, the movable support (902) rotates, the pull lug (911) is linked through wire drawing, the first return spring is compressed, the second return spring (912) is stretched, the pull lug (911) extrudes a push rod of the valve group (910) through a raised contact to drive the valve core to move, and an oil way for driving the lifting oil cylinder (12) to execute lifting action is conducted; after the induction wheel (901) crosses the bulge, the valve core is reset under the action of the first reset spring, and an oil way for driving the lifting oil cylinder (12) to execute lifting action is closed; the pull lug (911) is reset under the action of a second reset spring (912).

2. The full-automatic combined transplanting machine planting unit lifting control device as claimed in claim 1, wherein the drawing wire is connected with the movable support (902) through a buffer spring (905).

3. The full-automatic combined transplanting machine planting unit lifting control apparatus as claimed in claim 1, wherein said movable lug (908) is mounted on the mounting bracket (909) through a waist-shaped slot, and the relaxation state of the wire drawing is changed by adjusting the fixing position of the movable lug (908) in the waist-shaped slot to adjust the sensing sensitivity of the control mechanism.

4. The full-automatic combined transplanting machine planting unit lifting control device as claimed in claim 3, wherein the fixed lug (903) and the movable lug (908) are provided with notches communicated with the through hole, and the drawn wire is put into the through hole through the notches.

5. The fully automatic combined transplanting machine planting unit lifting control device as claimed in claim 4, wherein:

the movable lug (908) comprises a positioning part and a limiting part, wherein the positioning part is T-shaped and consists of a flange disc and a screw fixed on one side of the flange disc; the limiting part is fixed on the other side of the flange disc and is provided with the through hole and the opening, and the axis of the through hole is vertical to the axis of the screw rod; when the movable lug (908) is installed, the screw rod is inserted into the waist-shaped long hole until the flange plate is abutted on the surface of the installation support (909), and the screw rod is locked from the other side of the waist-shaped long hole by using a nut.

6. The lifting control device of a planting unit of a full-automatic combined transplanting machine as claimed in claim 2, wherein the upper part of the movable support (902) is provided with a plurality of positioning holes at different height positions, the positioning holes are used in cooperation with the adjustable rod (906), one end of the buffer spring (905) is hung on the adjustable rod (906), and the profile height of the planting unit is adjusted by installing the adjustable rod (906) in the positioning holes at different height positions.

7. The full-automatic combined transplanting machine planting unit lifting control apparatus as claimed in claim 1, wherein said sensing wheel (901) is a rubber wheel, which is composed of a middle bushing (901.2) and an outer rubber wheel (901.1), and said outer rubber wheel (901.1) is a hollow rubber wheel.

8. The fully automatic combined transplanting machine planting unit lifting control apparatus as claimed in any one of claims 1 to 7, wherein:

the lifting oil cylinder (12) is a single-action hydraulic cylinder, an oil delivery port is arranged on one side of a rod cavity of the lifting oil cylinder, oil is fed into the rod cavity, and then a piston rod moves to drive the transplanting unit to ascend.

9. The fully automatic combined transplanting machine planting unit lifting control device as claimed in claim 8, wherein:

the valve group (910) is a five-position four-way reversing valve and is provided with A, B, P, T four oil ports and five valve positions, wherein the five valve positions are respectively 1 position, 2 position, middle position, 3 position and 4 position, when the valve core moves to the 1 position, the A is communicated with the P oil port, and the B is communicated with the T oil port through a throttling channel; when the valve core moves to the 2 position, the oil port A is communicated with the oil port P through the throttling channel, and the oil port B is communicated with the oil port T; when the valve core moves to the middle position, the oil port A and the oil port B are both blocked, and the oil port P is communicated with the oil port T; when the valve core moves to the 3 position, the oil ports A and B are communicated through the throttling channel, and the oil ports P and T are communicated; when the valve core moves to the 4 position, the oil port A is communicated with the oil port B, and the oil port P is communicated with the oil port T through a throttling channel;

the hydraulic system comprises an oil tank (1001), an overflow valve (1004) and an unloading valve (1005), wherein a P oil port of a valve group (910) is connected with the oil tank (1001) through a first oil pipeline, and an oil pump (1003) is arranged in the first oil pipeline; the oil port A is connected with an oil delivery port of a rod cavity of the lifting oil cylinder (12) through a second oil delivery pipeline; the oil port B is connected with an oil tank (1001) through a first oil return pipeline; the T oil port is connected to the first oil return pipeline through a second oil return pipeline, and the connecting point of the T oil port is S; the overflow valve (1004) and the unloading valve (1005) are merged into a loop of a hydraulic system through a first branch pipeline, the first branch pipeline is arranged between a connection point S and a port of a second oil return pipeline, the connection points of two ends of the first branch pipeline and the first oil return pipeline are respectively M and N, in the first oil return pipeline, the connection point M is upstream of the connection point N, the first branch pipeline and the first oil return pipeline have a crossing point O, the overflow valve (1004) is arranged in a pipeline between the connection point M and the crossing point O, and the unloading valve (1005) is arranged in a pipeline between the crossing point O and the connection N on the other side of the crossing point O; the input end of the unloading valve (1005) is simultaneously connected with the second oil pipeline through a second branch pipeline.

10. A fully automatic combined transplanting machine planting unit lifting control apparatus as claimed in claim 9, wherein there are provided an electric cylinder (11) and a lifting control handle (13);

the electric cylinder (11) is arranged in front of the valve group (910), an output shaft of the electric cylinder (11) is parallel to a push rod of the valve group (910), the end part of the output shaft of the electric cylinder is positioned beside the pull lug (911) and is also aligned to the front end surface of the push rod, and the electric cylinder can push the push rod of the valve group to drive the valve core to switch valve positions;

the signal input end of the electric cylinder (11) is connected with a control system, the signal input end of the control system is connected with a lifting control handle (13), the stroke of an output shaft of the electric cylinder is controlled by operating the lifting control handle (13), and the position of a valve core of the valve group (910) is switched.