CN218244300U - Overload protection device and rotary cultivator thereof - Google Patents

Abstract

An overload protection device and a rotary cultivator thereof are disclosed, wherein the overload protection device comprises a pressure sensor, an electromagnetic valve and a controller, and the pressure sensor is connected with an oil way of a rotary tillage module in parallel so as to detect the oil pressure in the oil way of a rotary tillage oil cylinder; the control end of the electromagnetic valve is in communication connection with the controller, and the electromagnetic valve is used for controlling an oil path of the rotary tillage oil cylinder; the pressure sensor converts detected oil pressure into a voltage signal, the voltage signal is filtered by an inductor L1 and then is connected to an analog voltage input end of a comparator, reference voltage is input to a reference voltage input end of the comparator, and the output end of the comparator is connected to the controller; the comparator compares the voltage signal sent by the pressure sensor with the reference voltage, if the voltage signal is not greater than the reference voltage, the current output signal is kept, and the controller does not operate; once the voltage signal sent by the pressure sensor is greater than or equal to the reference voltage, the comparator inputs a control signal to the controller, and the controller controls the electromagnetic valve to start after receiving the signal, so that the rotary tillage module is lifted upwards.

Description

Overload protection device and rotary cultivator thereof

Technical Field

The utility model relates to a rotary cultivator especially relates to an overload protection device and rotary cultivator thereof.

Background

The rotary cultivator is a very common agricultural machine, and a prior application with the publication number of CN114766106A discloses a multifunctional crawler-type rotary cultivator, and the applicant actually tests the patent products to find that if a rotary cultivator blade encounters hard objects (large stones, a plurality of thick stones and the like) which cannot be cut off in the rotary cultivation process, the rotary cultivator blade stops suddenly, and because the torque at the rotary cultivator blade and the rotary cultivator cutter shaft is very large, the speed is greatly reduced to generate a large impact, the impact firstly damages the rotary cultivator blade, then is transmitted to a rotary cultivation oil cylinder (a switching oil cylinder in the CN 114766106A) along the rotary cultivator blade, the rotary cultivator cutter shaft and the rotary cultivation module and finally is transmitted to the whole, and if the impact force is small, the rotary cultivator blade, the rotary cultivator cutter shaft and the rotary cultivator module are mostly damaged, and if the impact force is a bit larger, the rotary cultivation oil cylinder is deformed, oil leaks, and a corresponding pipeline is exploded, and the whole is likely to deform and cause high maintenance cost and even scrap. Therefore, the rotary tillage module is required to be actively lifted when encountering impact, the impact force can be greatly buffered, and the rotary tillage module can directly cross an obstacle before the maximum impact force arrives, so that the overload protection is realized. Therefore, the impact on the whole rotary cultivator can be reduced, and the probability of deformation and damage of the rotary cultivation module, the rotary cultivation oil cylinder and the rotary cultivator caused by the impact is reduced.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned defects in the prior art, the present invention provides an overload protection device and a rotary cultivator thereof, which can actively drive the rotary tillage module to lift up to reduce and buffer the impact of the rotary tillage module when the rotary tillage module is impacted.

In order to achieve the purpose, the utility model provides an overload protection device, which is used for controlling an oil circuit of a rotary tillage oil cylinder to enable the rotary tillage oil cylinder to drive a rotary tillage module to lift up, a rotary tillage shaft sleeve is arranged on the rotary tillage module, the rotary tillage shaft sleeve and a rotary cultivator can be assembled in a circumferential rotating way, the rotary tillage shaft sleeve is assembled with a crank, the crank is hinged with a rotary tillage oil cylinder shaft of the rotary tillage oil cylinder, the rotary tillage oil cylinder shaft is arranged in a rotary tillage oil cylinder, and a shell of the rotary tillage oil cylinder is arranged on the rotary cultivator;

the rotary tillage oil cylinder oil path detection device comprises a pressure sensor, an electromagnetic valve and a controller, wherein the pressure sensor is connected with an oil path of a rotary tillage module in parallel so as to detect the oil pressure in the oil path of the rotary tillage oil cylinder; the control end of the electromagnetic valve is in communication connection with the controller, and the electromagnetic valve is used for controlling an oil way of the rotary tillage oil cylinder; the controller is used for receiving and sending analysis control instructions, performing parameter operation and program operation;

the pressure sensor converts detected oil pressure into a voltage signal, the voltage signal is filtered by an inductor L1 and then is connected to an analog voltage input end of a comparator, reference voltage is input to a reference voltage input end of the comparator, and the output end of the comparator is connected to the controller;

the comparator compares the voltage signal sent by the pressure sensor with the reference voltage, if the voltage signal is not greater than the reference voltage, the current output signal is kept, and the controller does not operate; once the voltage signal sent by the pressure sensor is greater than or equal to the reference voltage, the comparator can input a control signal to the controller, and the controller controls the electromagnetic valve to start after receiving the signal, so that the rotary tillage oil cylinder shaft of the rotary tillage oil cylinder contracts to drive the rotary tillage module to lift upwards.

As the utility model discloses a further improvement, the controller produces a delay signal through built-in procedure after receiving the signal, and the delay signal is carried to the solenoid valve, and delay signal control solenoid valve starts, and the solenoid valve resets after the delay signal timing ends, and the action of rotary tillage hydro-cylinder stops, lifting of rotary tillage module stops.

As a further improvement of the utility model, the electric capacity C1 is connected in parallel on the circuit that pressure sensor and comparator are connected, electric capacity C1 one end ground connection.

As the utility model discloses a further improvement, it has first resistance R1 to establish ties between the circuit that inductance L1 and electric capacity C1 are connected, and it has second resistance R2 to establish ties on the circuit that electric capacity C1 and comparator are connected, and it has resistance R3 to establish ties on the circuit of reference voltage input comparator, and it has fourth resistance R4 to establish ties between the analog signal input of comparator and the output.

As a further improvement of the utility model, an overload cylinder is connected in parallel on the oil circuit connected in parallel with the pressure sensor, the overload cylinder is mounted on the rotary seat through a mounting frame, an overload telescopic shaft of the overload cylinder passes through a vertical plate and then is assembled with a push plate, the vertical plate is mounted on the mounting frame, a collision switch is mounted at the position of the mounting frame corresponding to the push plate, and the collision switch can be triggered when the push plate moves to the collision switch; after the collision switch is triggered, a signal is input to the delay switch, so that the delay switch is closed for a preset time, the delay switch is connected between a coil of the electromagnetic valve and a direct-current power supply in series, the current of the direct-current power supply is introduced into the electromagnetic valve during delay switching, and hydraulic oil is introduced into the rotary tillage oil cylinder after the electromagnetic valve is electrified so as to drive a rotary tillage oil cylinder shaft of the rotary tillage oil cylinder to retract; and the closing time of the delay switch is automatically disconnected after reaching the preset time.

As a further improvement, the cover is equipped with the spring ring on the part that the flexible axle that transships is located riser overload hydro-cylinder between, the cover is equipped with overload spring on the part that the flexible axle that transships is located riser, spring ring, overload spring exerts to the flexible axle that transships and hinders its elasticity that stretches out to the riser.

As a further improvement of the utility model, the control circuit of the collision switch to the electromagnetic valve, the control circuit of the controller to the electromagnetic valve are connected to be a double control circuit.

As the utility model discloses a further improvement, it has the relief valve to establish ties between overload hydro-cylinder and the oil circuit, in case the oil pressure of oil circuit reaches the opening pressure of relief valve then to the hydro-cylinder fuel feeding that transships for overload hydro-cylinder drive flexible axle extension.

As a further improvement, the oil circuit of the overload oil cylinder is connected in parallel with the oil circuit of the rotary tillage oil cylinder, the overload oil cylinder drives the overload telescopic shaft to retract when the rotary tillage oil cylinder drives the rotary tillage module to rotate downwards, and the overload oil cylinder does not feed oil because of the blockage of the relief valve when the rotary tillage oil cylinder drives the rotary tillage module to rotate upwards.

The utility model also discloses a rotary cultivator, its application has above-mentioned overload protection device.

The utility model has the advantages that:

the utility model discloses an overload protection device utilizes the rotary tillage module to receive the characteristics that impact force can transmit to the rotary tillage hydro-cylinder when assaulting, and the basis of assaulting is received as judging the rotary tillage module to the sudden increase through monitoring rotary tillage hydro-cylinder oil pressure, in case the oil pressure reaches or surpasss the predetermined threshold value then judges for transshipping, and this moment through lifting the rotary tillage module and can the cushion impact fast and avoid follow-up bigger impact to carry out effectual overload protection to the rotary cultivator. In addition, a redundant control system of an overload oil cylinder and a collision switch is designed to realize double control and double insurance, so that impact generated at the rotary tillage module in the rotary tillage process can be effectively buffered and avoided, and the rotary cultivator is damaged too much.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

fig. 2-4 are schematic structural views of the present invention (excluding the digging part 110);

fig. 5 to 8 are schematic structural views (a part of the schematic structural view after the digging part 110 is removed) of the present invention;

FIGS. 9 to 11 are schematic views of the rotary tillage section;

fig. 12 to 14 are schematic structural views of the automatic clutch 200;

FIG. 15 is a schematic structural view of the automatic clutch 200 (with the pulley 410 and friction plate 470 in view);

fig. 16 is a schematic structural view of the automatic clutch 200 (a sectional view at a central plane where the axis of the carrier input shaft 131 is located);

fig. 17 is a schematic structural view of the automatic clutch 200 (a sectional view at another center plane where the axis of the gear box input shaft 131 is located);

fig. 18 to 22 are partial structural schematic views of the automatic clutch 200;

fig. 23-25 are schematic structural views of the first clutch housing 210 and the second clutch housing 220;

fig. 26 to 27 are schematic structural views of the locking mechanism, the gear box input shaft 131;

FIGS. 28-29 are schematic structural views of the locking mechanism;

FIGS. 30-31 are exploded views of the locking mechanism;

fig. 32 is a sectional view at the center plane where the axis of the lock cylinder shaft 731 is located;

fig. 33 is a schematic view of an overload protection apparatus;

fig. 34 is a schematic view of a modified structure of the overload protection apparatus.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Referring to fig. 1-4, the rotary cultivator of the embodiment comprises a body 100, wherein the body 100 comprises a chassis 101, a turning part 102 and a turning seat 103, the chassis 101 is provided with a crawler belt, and the crawler belt is used for carrying the whole rotary cultivator to run; the chassis 101 is assembled with the rotary seat 103 through the rotary part 102, and the rotary seat 103 can rotate relative to the chassis 101 through the rotary part 102, so that the flexibility and adaptability of the rotary cultivator are improved. The revolving unit 102 of the present embodiment may employ a revolving device of an existing excavator, such as a return gear. The use of gyration portion 102 can greatly increased the flexibility of rotary cultivator, because the operation face is narrow and small in the mountain area, if do not have the gyration portion and need change the mode that the rotary tillage direction just needs to adopt the tank to turn around this moment, the speed difference that also utilizes two tracks realizes turning to, and this can make chassis 101 exert very big shearing force to the top soil to promote the top soil along with rotating. Not only greatly increase the energy consumption, but also destroy the soil, especially some soft soil such as paddy field, black soil, once adopt the mode of tank turn around can directly destroy the soil of steering department, and then destroy the arable land, can be said to be irrevocable.

Referring to fig. 1 to 8, a rotary tillage part, a digging part 110, an engine 105 and an operation part 104 are mounted on the rotary base 103, the rotary tillage part and the digging part 110 are respectively mounted at two ends of the rotary base 103, the digging part comprises a digging arm and a bucket which are detachably assembled with the rotary base 103, and the bucket is mounted on the digging arm, so that a digging operation can be carried out by operating the bucket through the digging arm; the rotary tillage part comprises a rotary tillage module 120, an automatic clutch 200, a locking mechanism and an overload protection device, wherein the rotary tillage module 120 is used for tillage through a rotary tillage blade, the automatic clutch 200 is used for controlling the power combination or the power disconnection of an engine to the rotary tillage module, the locking mechanism is used for preventing the rotary tillage module 120 from rotating downwards under the condition of no need, and the overload protection device is used for controlling the rotary tillage module 120 to lift up when the rotary tillage module is greatly impacted so as to reduce the damage degree of the rotary tillage module 120 and the whole rotary cultivator.

The operating part 104 includes an operating platform 10411, an operating lever, an accelerator, a brake, a seat, and the like, and is mainly used for an operator to sit on and operate the rotary cultivator, the operating platform 1041 and the engine 105 are installed on two sides of the rotary base 103, which are located on the central plane 01 of the rotary part 102, and the engine 105 is installed close to the rotary part, that is, the distance between the engine 105 and the central plane 01 is greater than the distance between the operating part 104 (the operating platform 10411) and the central plane 01. The engine 105 and the rotary tillage part on the rotary base 103 occupy the main weight, and the engine 105 is installed near the rotary tillage part and on one side of the central plane 01, so that the center of gravity of the rotary base 103 deviates from the geometric center thereof, i.e. the center moves towards the rotary tillage part, and when the rotary tillage part is lifted up (in the state of fig. 4), the center can ensure that the whole rotary cultivator keeps balance when in a horizontal state as long as the center does not excessively move towards the rotary tillage part, thereby not influencing the running; and rotary tillage module 120 in case the rotation downwards and when being in operating condition, can further move the focus of whole rotary cultivator to rotary tillage module one side for rotary cultivator or gyration seat incline to rotary tillage module so that its dead weight part is acted on the rotary tillage module, this downforce that has just greatly increased rotary blade department, thereby can make the rotary blade carry out deeper farming operation and can not lift up the rotary cultivator and make the rotary cultivator be located the perk that makes progress of rotary tillage portion one end. In the rotary tillage process, even if the rotary cultivator pushes down (the operating part 104 tilts upwards) to the rotary tillage module, normal farming can not be influenced, because the utility model discloses a track is gone, and the normal walking of track is not influenced in its one end tilting, but sufficient holding down force can be exerted to the rotary tillage module through the rotary cultivator dead weight to operating part 104 tilting upwards. When the rotary cultivator is used for walking, an operator sits on the seat, and the seat is positioned on one side of the central plane 01, which is far away from the rotary tillage module, so that the weight of the operator is utilized to balance the weight of the whole rotary seat, and the running stability is further improved. In some road sections with slippery roads and/or steep slopes, the rotary seat 103 can be rotated to ensure that the rotary tillage part is in front and the operation part 104 is in back uphill, and the characteristic that the gravity center is deviated to the rotary tillage part is utilized to ensure that the crawler belt at one end of the rotary tillage part and the road surface obtain larger friction force, so that the grip of the rotary cultivator is improved, and the rotary cultivator can pass through bad road surfaces and sloping surfaces.

The utility model discloses an engine mounting is at the seat rear for the operator is back to the engine during operation, and this is different with current similar equipment, and current rotary cultivator is installed the engine in seat the place ahead, needs openly to the engine during operator's operation, and the tail gas of engine operation in-process can directly blow to the operator, and obviously this not only can cause very poor experience, and it is healthy still to seriously influence operator's operation and health. And the utility model discloses a back to the engine, the engine is located the rear of the direction of travel during the use, just also makes the tail gas of engine basically can not blow to the operator to improve operator's comfort level, and reduce the breathing capacity of operator to tail gas, this is a very humanized design, also is a big improvement to prior art.

The output shaft of the engine 105 is connected with the hydraulic pump 106 and the belt wheel 410 through the first belt 330 and the second belt 320, respectively, to form a belt transmission mechanism, so that the engine 105 can drive the hydraulic pump 106 to operate and the belt wheel 410 to rotate, respectively, after being started, the hydraulic pump 106 pressurizes hydraulic oil during operation, and the pressurized hydraulic oil is conveyed to a corresponding power device to be used as power, such as driving a crawler belt to run, driving a rotary tillage part to run, and driving an excavation part to run.

A hydraulic oil tank 107 is further mounted on the rotary base 103, and the hydraulic oil tank 107 is mounted below the operating portion 104 and used for storing hydraulic oil. This design allows the hydraulic oil tank 107 and the weight of the hydraulic oil inside it to act as a counterweight to balance the swivel in the state of fig. 4. According to the general knowledge, the volume change of hydraulic oil is very little, and therefore its stability as the counter weight is very strong, moreover the utility model discloses a power component mainly is through hydraulic oil drive, and consequently the memory space of hydraulic oil is bigger than normal, and this just plays important effect to the balance of whole revolving bed for during the state of fig. 4, though the focus of revolving bed 103 is partial to rotary tillage module 120, thereby be unlikely to the slope and influence normal driving. Of course, the utility model discloses a battery 108, control box etc. all install in operation portion 104 department, and this kind of design is for the convenience of installation, maintenance on the one hand, and on the other hand is also for the counter weight for the revolving bed is in balanced state when figure 4 state.

Referring to fig. 1 to 11, a rotary blade shaft is mounted on the rotary tillage module 120, a rotary blade is mounted on the rotary blade shaft, the rotary blade shaft is driven by a gear box 130, the gear box 130 inputs power through a gear box input shaft 131, the gear box input shaft 131 is driven by a belt pulley 410, and the power connection or disconnection between the gear box input shaft 131 and the belt pulley 410 is controlled by an automatic clutch 200.

The rotary tillage module 120 and the gear box 130 are assembled into a whole, the gear box input shaft 131 is circumferentially rotatably installed in the rotary tillage shaft sleeve 140, the rotary tillage shaft sleeve 140 is circumferentially rotatably installed on the machine body 100, the rotary tillage shaft sleeve 140 is further respectively assembled with the automatic clutch 200 and the crank 150, the crank 150 is further hinged with a rotary tillage telescopic shaft of the rotary tillage oil cylinder 310, the rotary tillage oil cylinder 310 is installed on the machine body 100, the rotary tillage telescopic shaft can be driven to axially extend and retract after the rotary tillage oil cylinder 310 is started, the rotary tillage shaft sleeve 140 is driven to rotate through the crank 150, the rotary tillage shaft sleeve 140 drives the rotary tillage module 120 and the gear box 130 to synchronously rotate, and therefore the rotary tillage module 120 rotates and descends relative to the machine body. When the land needs to be ploughed, the rotary tillage module 120 rotates towards the ground, so that the rotary tillage blades enter the soil to carry out rotary tillage; when the rotary tillage is not needed, the rotary tillage module 120 rotates away from the ground to be lifted, so that the rotary tillage module is kept at a certain distance from the ground to be convenient to drive (the state of fig. 4).

Referring to fig. 9-25, the automatic clutch 200 includes a pulley assembly 400, a first clutch housing 210, a second clutch housing 220, and a third clutch housing 240, wherein the third clutch housing 240 is mounted on the machine body 100, the first clutch housing 210 is circumferentially rotatably mounted on the third clutch housing 240, and the first clutch housing 210 is coaxially assembled with the rotary tillage shaft sleeve 140, and the rotary tillage shaft sleeve 140 can drive the first clutch housing 210 to rotate synchronously when rotating.

The gear box input shaft 131 penetrates through the first clutch shell 210 and the second clutch shell 220 and then is loaded into a belt wheel 410 of the belt wheel assembly 400, and the second clutch shell 220 is sleeved on the gear box input shaft 131 in a circumferentially rotatable and axially movable manner; the second clutch housing 220 is provided with a handle mounting part 221, a second clutch part 222 and a bearing mounting part 223 respectively, the handle mounting part 221 is hinged with one end of the handle 230 through a handle hinge pin 510, the second clutch part 222 is provided with a second clutch inclined plane 2221, and the bearing mounting part 223 is provided with an end face bearing 250;

the third clutch shell 240 is provided with a clamping groove part 241, and the clamping groove part 241 is clamped and assembled with the middle part of the handle 230; a handle slot 231 is formed through a portion of the handle 230 corresponding to the slot portion 241, and the locking bolt 520 passes through the slot portion 241 and the handle slot 231, so that the handle 230 cannot move relative to the third clutch housing 240 in the radial direction of the first clutch housing 210. The handle slot 231 is disposed along the length direction of the handle 230, and the locking bolt 520 can slide in the handle slot 231, so that the locking of the handle in the radial direction of the first clutch housing 210 is realized through the locking bolt 520, but the displacement space of the handle in the axial direction of the first clutch housing 210 is ensured. The locking bolt 520 is screwed with the slot part 241 through threads, and when the handle needs to be opened, the handle can be opened by rotating the locking bolt 520 out of the handle slot 231 by taking the handle hinge pin 510 as a center.

The first clutch housing 210 is further provided with a first clutch portion 211 and a clutch housing ring 212, the first clutch portion 211 is provided with a first clutch inclined surface 2111, the first clutch inclined surface 2111 and the second clutch inclined surface 2221 are attached to each other, and the first clutch inclined surface 2111 has a distance in the axial direction of the first clutch housing 210, so that when the first clutch housing 210 or the second clutch housing 220 rotates, the first clutch inclined surface 2111 and the second clutch inclined surface 2221 are matched to adjust the total length of the first clutch housing 210 and the second clutch housing 220 in the axial direction, that is, the second clutch housing 220 can be driven to move relative to the first clutch housing 210 along the axial direction.

The pulley assembly 400 comprises a pulley shell 410, the pulley shell 410 is hollow, a pulley clamping groove 412 is formed in the inner wall of the pulley shell 410, the pulley clamping groove 412 is clamped with a friction disc protrusion 471 and can be assembled in an axial sliding mode, and the friction disc protrusion 471 is arranged on a friction disc 470; the friction disc 470 is circumferentially and axially movably fitted on the gear box output shaft 131, and the pulley 410 can drive the friction disc 470 to rotate synchronously when rotating.

The friction disc 470 can be in compression transmission with the clutch disc 460, the clutch disc 460 can be axially slidably and non-circumferentially sleeved on the gear box output shaft 131, and when the friction disc 470 and the clutch disc 460 are in compression transmission, the belt pulley 410 can drive the gear box input shaft 131 to rotate, so that the rotary tillage blade is driven to rotate.

Referring to fig. 16, friction disc 470 and clutch disc 460 engaging therewith are a pair of clutch assemblies, in this embodiment at least two pairs of clutch assemblies; the friction disc 470 closest to the second clutch housing 220 is provided with a mounting hole 472, the mounting hole 472 is assembled with one end of the spring post 442, the other end of the spring post 442 is assembled with one end of the clutch lever 440, and the spring post 442 cannot pass through the friction disc 470 matched with the spring post 442; the other end of the clutch rod 440 is sleeved with a spring 610 and penetrates out of the pulley 410 to be assembled with the large limiting end 441, the clutch rod 440 can slide axially relative to the pulley 410, and two ends of the spring 610 are respectively pressed on the friction disc 470 which is close to the inner wall of the pulley 410, so that elastic force for pressing the clutch disc 460 is applied to the friction disc 470, each pair of clutch components are pressed to transmit, and at the moment, in a clutch combination state, the pulley 410 drives the gear box input shaft to rotate. The large limiting end 441 can be a gasket and a nut, specifically, the gasket is mounted on one side close to the belt wheel, and the nut is mounted on one side far away from the belt wheel, so that the gasket is prevented from sliding out of the nut.

The part of the clutch lever 440 between the large limit end 441 and the pulley 410 is clamped into the fork groove 421 and can slide with the fork groove 421, the fork groove 421 is arranged on one end of the pawl 420, the middle part of the fork groove 421 is hinged with the hinge seat 411 through the pawl hinge pin 430, the hinge seat 411 is arranged on the pulley 410, and the other end of the pawl 420 is pressed with the end face of the end face bearing 250.

In use, the second clutch housing 220 can move axially, and as for fig. 17, when the second clutch housing 220 moves leftwards, the end bearing 250 presses the open end of the pawl 420, the pawl 420 rotates around the pawl hinge pin 430, so that the clutch rod 440 is driven to move towards the first clutch housing 210 against the elastic force of the spring 610, which drives the friction disc 470 corresponding to the clutch rod towards the first clutch housing 210, so that the pressing force between each pair of clutch components is reduced or eliminated, and at this time, the friction disc 470 cannot drive the clutch disc 460 to rotate due to insufficient friction force between the friction disc 470 and the clutch disc 460, so that the gear box input shaft 131 cannot be driven to rotate, and at this time, the clutch is in the clutch off state. And the handle slot 231 is designed to avoid interference with the movement of the second clutch housing 220 by sliding between the handle slot and the locking bolt 520 when the second clutch housing 220 moves axially.

When the clutch needs to be combined, the second clutch shell 220 moves towards the first clutch shell 210, and the friction disc 470 is pressed towards the clutch disc 460 under the action of the spring 610, so that the friction transmission state is recovered; at the same time, the clutch lever 440 moves away from the first clutch housing 210, so that the end of the pawl 420 away from the fork 421 is pressed against the end-face bearing 250.

When the rotary cultivator is used, once the rotary cultivator blade is wound with foreign matters to cause the engine to be blocked and flamed out, the transmission between the belt wheel and the input shaft of the gear box must be cut off, otherwise, the engine cannot be started due to overlarge load. At this time, the locking bolt 520 is screwed out of the handle groove 231, the handle 230 is screwed out of the clamping groove part 241, then the handle 230 is used for driving the second clutch shell 220 to rotate relative to the first clutch shell 210, so that the second clutch shell 220 can move away from the first clutch shell 210, the transmission between the belt wheel and the gear box input shaft is cut off, then the engine is started, the rotary tillage oil cylinder 310 is used for driving the rotary tillage module 120 to be lifted, and sundries on the rotary tillage blades are cleaned; finally, the handle 230 and the locking bolt 520 are reset, so that the first clutch housing 210 and the second clutch housing 220 are restored to the clutch separation state. If the rotary tillage part needs to be reused, the rotary tillage part is directly rotated towards the ground, the rotary tillage shaft sleeve 140 drives the first clutch housing 210 to rotate, so that the clutch assembly is restored to a friction combination state, and rotary tillage operation is started.

Preferably, the clutch housing ring 212 is fitted into the second clutch housing 220 and is fitted to it in a circumferentially rotatable and axially displaceable manner, and the first clutch part 211 is arranged on the outer wall of the clutch housing ring 212. This design is mainly to ensure the accurate positioning of the first clutch housing 210 and the second clutch housing 220, so as to ensure that the first clutch housing 210 can drive the second clutch housing 220 to move axially accurately when rotating, and simultaneously ensure the stable installation of the second clutch housing 220.

Preferably, an end of the pulley 410 away from the hinge seat 411 is open, and the opening is closed by an end cover 450, specifically, a bolt is assembled and fixed with the pulley after passing through the end cover 450. This design is primarily convenient for installation and later maintenance of the friction discs 470, 460.

Referring to fig. 5-16 and 26-32, the locking mechanism includes a ratchet wheel 710 mounted on the rotary tillage shaft sleeve 140, the ratchet wheel 710 is provided with a plurality of ratchet teeth in the circumferential direction, and each ratchet tooth is provided with a first ratchet surface 711 and a second ratchet surface 712; a ratchet groove 713 is formed between the two ratchet teeth, one ratchet groove 713 is in clamping fit with one end of the locking pawl 740, a first locking surface 741 and a second locking surface 742 are respectively arranged at one end, where the locking pawl 740 is assembled with the ratchet groove 713, the first locking surface 741 is in fit with the first ratchet surface 711, and the second locking surface 742 is in fit with the second ratchet surface 712; the first locking surface 741 has a curvature and the first ratchet surface 711 is an inclined surface, so that when the ratchet 710 rotates counterclockwise (as reference in fig. 32), the first locking surface 741 can be pressed by the first ratchet surface 711, thereby pushing the locking pawl 740 to rotate; when the second locking surface 742 and the second ratchet surface 712 are in a flat state, the second ratchet surface 712 is locked by the second locking surface 742, so that the ratchet wheel cannot rotate clockwise (fig. 32). Therefore, after the rotary tillage shaft sleeve 140 is lifted upwards, the rotary tillage shaft sleeve can be matched with the locking claw 740 through the ratchet wheel so as not to rotate downwards, and the rotary tillage shaft sleeve is safer. Because the rotary tillage module mainly walks when lifted, sundries wound on the rotary tillage blades need to be cleaned in the tillage process, the position of the rotary tillage module is limited by the rotary tillage oil cylinder 310, potential safety hazards obviously exist at the moment, the rotary tillage oil cylinder is likely to leak and break due to the fact that an oil path of the rotary tillage oil cylinder 310 is likely to leak, the rotary tillage oil cylinder is likely to be damaged and leak oil, once the situation is generated, the rotary tillage module can rotate downwards on the premise of no need, at the moment, if the rotary tillage module is provided with people to clean the sundries, great potential safety hazards can be caused, and if the rotary tillage is out of control in the driving process, the rotary tillage is caused.

Referring to fig. 32, a locking rod 750 is mounted on one end of the locking claw 740 away from the ratchet wheel 710, a sliding rod portion 751 is disposed on the locking rod 750, the locking claw 740 is engaged with and slidably assembled with a locking sliding slot 721, the locking sliding slot 721 is disposed on the locking base 720, and the locking base 720 is mounted on the rotary base 103; the locking rod 750 is assembled with one end of the locking spring 620, the other end of the locking spring 620 is assembled with the locking cylinder shaft 731, the locking cylinder shaft 731 is arranged in the locking cylinder 730, and the locking cylinder 730 is arranged on the locking seat 720; the lock cylinder shaft 731 is provided with a shaft hole 732, and the shaft hole 732 is axially slidably fitted with the slide bar portion 751.

The locking cylinder 730 is a two-way cylinder, that is, the locking cylinder shaft 731 can be driven to axially extend and retract. The locking cylinder 730 is connected in parallel with the oil path of the rotary tillage cylinder 310, and before the rotary tillage cylinder 310 drives the rotary tillage telescopic shaft to extend so as to drive the rotary tillage module 120 to rotate downwards, the locking cylinder 730 drives the locking cylinder shaft 731 to retract so as to pull the locking claw 740 to move towards the locking cylinder direction through the locking spring 620, so that the locking claw 740 is withdrawn from the ratchet groove. At this time, the ratchet 710 can rotate clockwise (as reference in fig. 32), so that the rotary tillage shaft sleeve 140 can rotate, i.e. the rotary tillage module 120 can rotate downward.

Before the rotary tillage module 120 rotates upwards, the locking cylinder 730 drives the locking cylinder shaft 731 to extend, so that the locking claw 740 is pushed to reset by the locking spring 620, and at the moment, a distance is reserved between the locking rod 750 and the locking cylinder shaft 731, so that the locking rod 750 can move towards the locking cylinder shaft 731; and when rotary tillage module 120 upwards, the rotary tillage shaft sleeve drives the ratchet to rotate synchronously so that the ratchet continuously pushes the unlocking stopping claw 740 to rotate in a single direction, but the ratchet cannot rotate in the reverse direction until the rotary tillage module rotates to a preset position, and even if the hydraulic oil of the rotary tillage oil cylinder is disconnected, the rotary tillage module cannot rotate downwards and is in a locking state, so that the rotary tillage module is safer.

Preferably, in order to prevent simultaneous oil feeding between the locking cylinder 730 and the rotary tillage cylinder 310, the rotary tillage cylinder 310 acts faster than the locking cylinder 730, thereby causing interference and even damage to the ratchet pawl. This implementation still establishes ties on rotary tillage hydro-cylinder 310's oil circuit and has the choke valve, when rotary tillage hydro-cylinder 310 oil feed, because the oil circuit of locking hydro-cylinder 730 connects in parallel with rotary tillage hydro-cylinder 310, consequently hydraulic oil can get into locking hydro-cylinder 730, rotary tillage hydro-cylinder 310 simultaneously, but because the existence of choke valve can make hydraulic oil get into in locking hydro-cylinder 730 in a large number earlier, thereby make locking hydro-cylinder 730 move earlier, thereby hydraulic oil all gets into rotary tillage hydro-cylinder 310 through the choke valve and moves after the pressure of locking hydro-cylinder 730 satisfies. In addition, the area of the piston end surface of the rotary tillage cylinder 310 is larger than that of the piston end surface of the locking cylinder 730, so that even if the locking cylinder 730 and the rotary tillage cylinder 310 enter hydraulic oil with the same volume, the action of the locking cylinder 730 is faster than that of the rotary tillage cylinder 310. Therefore, before the rotary tillage oil cylinder acts, the locking oil cylinder 730 already completes the action, so that the rotary tillage oil cylinder is linked to be used conveniently without interference; on the other hand, the arrangement and control cost of the oil way is effectively reduced.

Referring to fig. 33, because the torque output by the rotary blade is relatively large in the rotary tillage process, the rotary blade shaft of the present invention is also hard connected to the entire rotary base 103, and in addition, the hydraulic thrust of the rotary blade cylinder during rotary tillage, if the rotary blade encounters a hard foreign object such as a stone (a large stone), a thick number of the rotary blade shaft, and a branch that cannot be cut off in time during the rotary tillage process, the rotary blade shaft will generate a very large impact, and the rotary blade shaft will stop suddenly, and the impact will damage the rotary blade shaft first, and then is transmitted to the rotary blade shaft, the entire rotary tillage module, the rotary blade cylinder, and the rotary base in sequence, when the impact is not large, the deformation of the rotary blade shaft and the rotary tillage module may be caused, or the rotary blade cylinder is overloaded, and the pipeline thereof is burst; when the impact is too large, the whole rotary seat and the rotary cultivator are even deformed, so that the rotary cultivator is scrapped or overhauled, and therefore the rotary cultivation oil cylinder is required to lift the rotary cultivation module upwards to unload most of impact force when the rotary cultivation module is greatly impacted, and meanwhile, the rotary cultivator is protected by bypassing the foreign matters which cannot be cut off. An overload protection device is further designed for the rotary tillage device, the overload protection device comprises a pressure sensor 810, a solenoid valve 820 and a controller 830, and the pressure sensor 810 is communicated with an oil way of the rotary tillage module so as to detect oil pressure in the oil way of the rotary tillage oil cylinder, namely, the oil pressure in the rotary tillage oil cylinder is indirectly detected. In this embodiment, pressure sensor 810 can connect in parallel at the oil inlet department when rotary tillage hydro-cylinder drive rotary tillage hydro-cylinder axle is elongated to can backward extrusion hydraulic oil when making rotary tillage hydro-cylinder axle will strike and transmit in the rotary tillage hydro-cylinder, thereby make oil inlet department oil pressure at this moment rise. The control end of the electromagnetic valve 820 is in communication connection with the controller 830, and the electromagnetic valve 820 is used for controlling the oil path of the rotary tillage oil cylinder, such as the oil inlet direction and the oil inlet speed (opening control) of the rotary tillage oil cylinder, so as to control the extension and retraction speed of the rotary tillage oil cylinder shaft. The controller is used for receiving and dispatching analytic control command and carries out parameter operation, program operation in this embodiment, can choose for use MCU, PLC, CPU etc, the utility model discloses a model machine chooses for use MCU.

The pressure sensor 810 converts the detected oil pressure into a voltage signal, the voltage signal is filtered by an inductor L1 and then is connected to an analog voltage input end of the comparator 840, a reference voltage is input to a reference voltage input end of the comparator 840, and an output end of the comparator 840 is connected to the controller. When the device is used, the voltage value output by the pressure sensor 810 when the rotary tillage oil cylinder 310 is overloaded is calibrated to be used as an analog voltage value, then the pressure sensor 810 detects the oil pressure in real time and inputs a signal into the comparator 840, the comparator 840 compares the voltage signal sent by the pressure sensor 810 with a reference voltage, if the voltage signal is not greater than the reference voltage value, the current output signal is kept, and the controller does not operate; once the voltage signal sent by the pressure sensor 810 is greater than or equal to the reference voltage, the comparator 840 inputs a control signal to the controller, the controller 830 generates a delay signal through a built-in program after receiving the signal, and then the delay signal is transmitted to the electromagnetic valve 820, the delay signal controls the electromagnetic valve to start, so as to control the shaft of the rotary tillage cylinder to contract to drive the rotary tillage module 120 to lift upwards, and after the timing of the delay signal is finished, the lifting of the rotary tillage module 120 stops. Because the rotary blade is blocked to obtain impact, the rotary blade module is lifted to prevent overload, so the rotary blade is generally damaged, but the rotary blade is a consumed part and is cheap to replace, and high maintenance cost is not caused.

Preferably, in order to ensure that the signal of the pressure sensor is stably and sensitively transmitted to the comparator 840, the present embodiment further connects a capacitor C1 in parallel on a line connecting the pressure sensor and the comparator, and one end of the capacitor C1 is grounded, and the design mainly utilizes the energy storage and filtering of the capacitor.

Preferably, a first resistor R1 is connected in series between lines connecting the inductor L1 and the capacitor C1, a second resistor R2 is connected in series between the capacitor C1 and the comparator 840, a resistor R3 is connected in series between lines connecting the reference voltage input comparator 840, and a fourth resistor R4 is connected in parallel between an analog signal input end and an output end of the comparator 840. The series-connected resistors are used as loads on the one hand and can also increase the accuracy of the signal processing on the other hand.

Referring to fig. 34, although the automatic control mode is simple in structure and fast in control speed, the reliability of electronic products is generally inferior to that of mechanical products, and considering that the rotary tillage module is damaged very strongly by excessive impact, a certain redundancy design is necessary for overload protection, which can realize the lifting of the rotary tillage module through another design when a pressure sensor and a controller are in failure, thereby realizing the purpose of double insurance.

In this embodiment, an oil path 860 through which the pressure sensor 810 is connected in parallel is further connected in parallel with an overload cylinder 850, the overload cylinder 850 is mounted on the rotary base 103 through the mounting bracket 160, an overload telescopic shaft 851 of the overload cylinder 850 penetrates through the vertical plate 161 and then is assembled with the push plate 852, a spring ring 853 is sleeved on a portion of the overload telescopic shaft 851 located between the overload cylinders 850 of the vertical plate 161, an overload spring 630 is sleeved on a portion of the overload telescopic shaft 851 located between the vertical plate 161 and the spring ring 853, and the overload spring 630 exerts an elastic force on the overload telescopic shaft 851 to prevent the overload telescopic shaft 851 from extending toward the vertical plate 161. The vertical plate 161 is installed on the installation frame 160, a collision switch 861 is installed at the position, corresponding to the push plate 852, of the installation frame 160, and the collision switch 861 can be triggered when the push plate 852 moves towards the collision switch 861; the collision switch 861 is triggered to input a signal to the delay switch 862 so that the delay switch 862 is closed for a preset time, the delay switch is connected in series between a coil (a power connection end) of the solenoid valve and a direct current power supply, so that the current of the direct current power supply is introduced into the solenoid valve when the delay switch 862 is powered on, the solenoid valve acts, hydraulic oil is introduced into the rotary tillage oil cylinder 310 to lift the rotary tillage module 120, the closing time of the delay switch 862 is automatically switched off after reaching a preset time, and thus the rotary tillage module is prevented from being excessively lifted. Of course, the collision switch 861 with a time delay function can be selected for use in this embodiment, so that the direct current power supply and the coil are connected and conducted to a preset time after the collision switch 861 is triggered.

In the initial state, the oil pressure in the oil passage 860 cannot drive the overload telescoping shaft 851 to extend, so that the push plate is away from the collision switch. Once the rotary tillage module generates overload impact, the oil pressure in the oil path 860 is instantly increased, and the increased oil pressure enters the overload oil cylinder 850 to drive the overload telescopic shaft 851 to extend, so that a collision switch is triggered. Of course, if the pressure sensor and the controller are controlled timely, the push plate is likely not to trigger the collision switch. If the pressure sensor and the controller are not controlled timely, the collision switch can be triggered, and the collision switch is used for directly controlling the electromagnetic valve to act. The rotary cultivator can be controlled to lift up and release pressure before impact force is transmitted to the rotary seat, so that the rotary cultivator is prevented from being further damaged.

In this embodiment, the control circuit of the collision switch 861 for the solenoid valve 820 and the control circuit of the controller for the solenoid valve 820 can be connected to a dual control circuit, which is similar to a dual control lamp, and the solenoid valve can be controlled no matter which one is triggered, thereby achieving dual control and dual insurance.

Preferably, a relief valve may be connected in series between the overload cylinder 850 and the oil path 860, and once the oil pressure of the oil path reaches the opening pressure of the relief valve, oil is supplied to the overload cylinder 850, so that the overload cylinder 850 drives the overload telescopic shaft 851 to extend, and the overload cylinder 850 employs a bidirectional cylinder, which can realize retraction and resetting of the overload telescopic shaft 851 by switching the oil feeding direction after driving the overload telescopic shaft 851 to extend. The oil circuit of overload hydro-cylinder 850 can be parallelly connected with the oil circuit of rotary tillage hydro-cylinder for overload hydro-cylinder 850 drives overload telescopic shaft 851 and contracts when rotary tillage hydro-cylinder drive rotary tillage module is rotated downwards, and when rotary tillage hydro-cylinder drive rotary tillage module was rotated upwards, because the blockking of relief valve, overload hydro-cylinder 850 did not take oil, thereby realizes the linkage of overload hydro-cylinder 850 and rotary tillage hydro-cylinder.

The vertical direction of the utility model is based on figure 4.

The details of the present invention are well known to those skilled in the art.

The foregoing has described in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be devised by those skilled in the art in light of the teachings of the present invention without undue experimentation. Therefore, the technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection defined by the claims.

Claims (9)

1. An overload protection device is used for controlling an oil path of a rotary tillage oil cylinder so as to enable the rotary tillage oil cylinder to drive a rotary tillage module to lift up, a rotary tillage shaft sleeve is arranged on the rotary tillage module, the rotary tillage shaft sleeve and a rotary cultivator can be assembled in a circumferential rotating mode, the rotary tillage shaft sleeve is assembled with a crank, the crank is hinged with a rotary tillage oil cylinder shaft of the rotary tillage oil cylinder, the rotary tillage oil cylinder shaft is arranged in the rotary tillage oil cylinder, and a shell of the rotary tillage oil cylinder is arranged on the rotary cultivator;

the method is characterized in that: the rotary tillage oil cylinder oil path detection device comprises a pressure sensor, an electromagnetic valve and a controller, wherein the pressure sensor is connected with an oil path of a rotary tillage module in parallel so as to detect the oil pressure in the oil path of the rotary tillage oil cylinder; the control end of the electromagnetic valve is in communication connection with the controller, and the electromagnetic valve is used for controlling an oil way of the rotary tillage oil cylinder; the controller is used for receiving and sending analysis control instructions, performing parameter operation and program operation;

the pressure sensor converts detected oil pressure into a voltage signal, the voltage signal is filtered by an inductor L1 and then is connected to an analog voltage input end of a comparator, reference voltage is input to a reference voltage input end of the comparator, and the output end of the comparator is connected to the controller;

the comparator compares the voltage signal sent by the pressure sensor with the reference voltage, if the voltage signal is not greater than the reference voltage, the current output signal is kept, and the controller does not operate; once the voltage signal sent by the pressure sensor is greater than or equal to the reference voltage, the comparator can input a control signal to the controller, and the controller controls the electromagnetic valve to start after receiving the signal, so that the rotary tillage oil cylinder shaft of the rotary tillage oil cylinder contracts to drive the rotary tillage module to lift upwards.

2. The overload protection device according to claim 1, wherein: and a capacitor C1 is connected in parallel with a line connecting the pressure sensor and the comparator, and one end of the capacitor C1 is grounded.

3. An overload protection apparatus according to claim 1 or claim 2 wherein: a first resistor R1 is connected in series between lines connected with the inductor L1 and the capacitor C1, a second resistor R2 is connected in series on the lines connected with the capacitor C1 and the comparator, a resistor R3 is connected in series on the lines for inputting reference voltage into the comparator, and a fourth resistor R4 is connected in parallel between the analog signal input end and the output end of the comparator.

4. An overload protection apparatus according to claim 3 wherein: an overload oil cylinder is connected in parallel on an oil way in parallel with a pressure sensor, the overload oil cylinder is arranged on a rotary seat through an installation frame, an overload telescopic shaft of the overload oil cylinder penetrates through a vertical plate and then is assembled with a push plate, the vertical plate is arranged on the installation frame, a collision switch is arranged at the position, corresponding to the push plate, of the installation frame, and the collision switch can be triggered when the push plate moves to the collision switch; after the collision switch is triggered, a signal is input to the delay switch, so that the delay switch is closed for a preset time, the delay switch is connected between a coil of the electromagnetic valve and a direct-current power supply in series, the current of the direct-current power supply is introduced into the electromagnetic valve during the delay switch, and hydraulic oil is introduced into the rotary tillage oil cylinder after the electromagnetic valve is electrified so as to drive a rotary tillage oil cylinder shaft of the rotary tillage oil cylinder to retract; the closing time of the delay switch is automatically disconnected after reaching the preset time.

5. The overload protection apparatus of claim 4, wherein: the part of the overload telescopic shaft between the overload oil cylinders of the vertical plate is sleeved with a spring ring, the part of the overload telescopic shaft between the vertical plate and the spring ring is sleeved with an overload spring, and the overload spring exerts elastic force on the overload telescopic shaft to prevent the overload telescopic shaft from extending towards the vertical plate.

6. The overload protection device according to claim 4, wherein: the control circuit of the collision switch to the electromagnetic valve and the control circuit of the controller to the electromagnetic valve are connected into a double-control circuit.

7. The overload protection apparatus of claim 4, wherein: a pressure release valve is connected between the overload oil cylinder and the oil way in series, once the oil pressure of the oil way reaches the opening pressure of the pressure release valve, oil is supplied to the overload oil cylinder, and the overload oil cylinder drives the overload telescopic shaft to extend.

8. The overload protection apparatus of claim 7, wherein: the oil circuit of the overload oil cylinder is connected with the oil circuit of the rotary tillage oil cylinder in parallel, when the rotary tillage oil cylinder drives the rotary tillage module to rotate downwards, the overload oil cylinder drives the overload telescopic shaft to retract, and when the rotary tillage oil cylinder drives the rotary tillage module to rotate upwards, the overload oil cylinder does not feed oil due to the blocking of the pressure release valve.

9. A rotary cultivator is characterized in that: use is made of an overload protection device according to any one of claims 1 to 8.

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