Overload passive abdicating structure and rotary cultivator

Abstract

The utility model discloses an overload passive abdicating structure and a rotary cultivator, the overload passive abdicating structure comprises a rotating part, a fixed part and a power cylinder, the rotating part can rotate relative to the fixed part, and the rotating part is provided with an abdicating groove; the receding groove is assembled with a pin shaft, the pin shaft is installed on a power cylinder shaft, the power cylinder shaft is installed in a power cylinder, and the power cylinder drives the power cylinder shaft to stretch out and draw back in the axial direction so as to drive the rotating part to rotate relative to the fixed part. The receding groove is larger than the pin shaft. According to the overload protection module, the overload passive lifting resistance can be increased through the damping cylinder, and therefore the overload lifting strength is improved. The Hall sensor is used for detecting the distance between the Hall sensor and the corresponding magnet to judge whether the corresponding overload oil cylinder needs to be lifted or not so as to achieve further overload protection. The design is mainly used for realizing passive abdication when the overload pressure is small and active abdication when the overload pressure is large, so that more flexible overload protection is realized.

Description

Technical Field

[0001] The utility model relates to a rotary tiller, in particular to an overload passive yielding structure and a rotary tiller. Background Art

[0002] During the research and development testing of the Chinese utility model patent with publication number CN221151928U, it was found that it did not have a field leveling function, so it was not possible to level the field after plowing. Therefore, it was urgently needed to add a field leveling function. Currently, field leveling is mainly achieved by a field leveling device, and there are two main technical solutions:

[0003] One method involves attaching a leveler to the ground with chains, using the weight of the leveler to press down on the ground. The leveler is then dragged along by a rotary tiller or tractor to level the field. The biggest advantage of this method is its simplicity and the ability to automatically tilt to accommodate rocks and hard soil. However, its disadvantage is that the ends of the scraper are prone to tilting, resulting in poor leveling results and making integrated transport difficult.

[0004] The other method is to connect the field leveler through a cylinder, which is responsible for the lifting and lowering of the field leveler. This method makes it easy to put away and release the field leveler, making it easier to transport it together with the rotary tiller. At the same time, the oil cylinder can be used to control the height of the field leveler to control the height of the field. The disadvantage is that once the soil hardness and height at both ends of the scraper are uneven (tilted), the field leveling effect will be unsatisfactory. For example, in a tilted field, it is easy to cause the scraping thickness on one end of the scraper to be insufficient while the thickness on the other side is too large, resulting in poor field leveling effect on one side and a pit directly scraped out on the other side. The main reason for this is that the scraper has only one degree of freedom to adjust, and the two ends cannot be tilted and adjusted.

[0005] Therefore, it is necessary to improve the field leveling device to adapt it to the needs of leveling fields on mountainous slopes. This has become a technical problem that urgently needs to be solved.

[0006] In addition, a Chinese utility model patent with publication number CN218244300U discloses a solution for controlling the oil cylinder to lift the rotary tilling part by detecting the oil pressure of the oil cylinder to determine whether it is overloaded. Although this solution can effectively prevent overload and thus protect the rotary tiller, the calibration of its overload pressure should not be too low, otherwise it will be difficult to meet the needs of adapting to most soil types. However, there are some stones, large hard soil blocks, tree stumps, etc. in the land. At this time, if the overload pressure is too high, it will easily lead to poor protection effect. Therefore, it is necessary to improve on this basis, strive to make it have automatic adjustment and adaptability under low overload, and can quickly lift up to prevent damage to the equipment under high overload, and even do not need a special lifting control, but can flexibly adapt to low impact. In this way, not only the entire structure is simplified and the cost is reduced, but it is also more convenient to use. However, there is currently no similar technical solution, which has become a technical problem that needs to be solved urgently. Utility Model Content

[0007] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide an overload passive yielding structure and a rotary tiller, which can produce a small angle upward rotation when overloaded to achieve overload protection.

[0008] To achieve the above objectives, the present invention provides an overload passive yield structure, comprising a rotating portion, a fixed portion, and a power cylinder. The rotating portion is rotatable relative to the fixed portion, and a yield groove is provided on the rotating portion. The yield groove is assembled with a pin, which is mounted on the power cylinder shaft. The power cylinder shaft is installed in the power cylinder, and the power cylinder drives the power cylinder shaft to axially extend and contract to drive the rotating portion to rotate relative to the fixed portion. The yield groove is larger than the pin, so that the yield groove can rotate relative to the pin when the rotating portion is passively rotated and the power cylinder shaft does not move. The power cylinder only needs to be able to drive the power cylinder shaft to move axially, such as an oil cylinder, a pneumatic cylinder, an electric cylinder, etc.

[0009] As a further improvement of the present invention, the rotating part and the fixed part are respectively assembled with two ends of an overload spring, and the overload spring is used to increase the resistance to the rotation of the rotating part.

[0010] As a further improvement of the present invention, the present invention further comprises a boosting cylinder, wherein a hinge block is mounted on the boosting cylinder shaft of the boosting cylinder, the hinge block is hinged to the rotating part via a first hinge shaft, and the housing of the boosting cylinder is hinged to the fixed part via the first hinge shaft;

[0011] A slip ring is engaged and slidably installed inside the boosting cylinder, and the slip ring divides the inside of the boosting cylinder into a first sliding hole and a second sliding hole. A slip ring spring is installed in the second sliding hole. The slip ring is assembled with one end of the boosting cylinder shaft, and the other end of the boosting cylinder shaft passes through the boosting cylinder.

[0012] As a further improvement of the present invention, a magnet is installed on one end of the booster cylinder shaft and the slip ring assembly, a sensor seat is installed in the booster cylinder, and a Hall sensor is installed on the sensor seat. The Hall sensor connects the signal to the industrial computer of the fuselage through a wire, and the Hall sensor is used to detect the distance between the magnet and the sensor.

[0013] As a further improvement of the present invention, the fixed part is the body of the rotary tiller, the rotating part is the rotary tillage seat, the power cylinder is the rotary tillage cylinder, the power cylinder shaft is the rotary tillage cylinder shaft, and the pin shaft is the rotary tillage pin shaft. The rotary tillage pin shaft is installed on the rotary tillage groove and can be slidably assembled with it relative to the rotary tillage groove. The rotary tillage groove is arranged on the rotary tillage seat, and the rotary tillage seat is installed and fixed on the rotary tillage frame. One end of the rotary tillage frame is hinged to the fuselage through the rotary tillage frame shaft, and the other end is fixed to the rotary tillage shield.

[0014] As a further improvement of the present invention, the rotary tillage clearance groove is larger than the rotary tillage pin shaft. When the rotary tillage frame rotates upward under the action of external force and the rotary tillage cylinder shaft does not move, the rotary tillage clearance groove rotates along the rotary tillage pin shaft.

[0015] As a further improvement of the present invention, the fixed part is the rotary tillage shield, the rotating part is the flat field frame, the power cylinder is the flat field oil cylinder, the power cylinder shaft is the flat field oil cylinder shaft, and the pin shaft is the flat field pin shaft. The flat field oil cylinder has a flat field pin shaft installed on the flat field oil cylinder shaft. The flat field pin shaft is inserted into the flat field give way groove and can be slidably assembled relative to it. The flat field give way groove is arranged on the flat field give way seat, and the flat field give way seat is installed and fixed on the flat field frame; the flat field frame is rotatably assembled with the rotary tillage shield.

[0016] As a further improvement of the present invention, the Hirata give way groove is larger than the Hirata pin shaft. When the Hirata give way seat, Hirata frame and scraper rotate upward under the action of external force and the Hirata cylinder shaft does not move, the Hirata give way groove rotates along the Hirata pin shaft.

[0017] As a further improvement of the present invention, the booster cylinder is replaced by a movable oil cylinder, and the movable oil cylinder adopts a liquid supply valve to supply liquid; the movable oil cylinder is sealed inside and a piston is slidably installed, and the piston is fixed to one end of the movable oil cylinder shaft; the movable oil cylinder shaft is hinged to the rotating part, and the outer shell of the movable oil cylinder is hinged to the fixed part through a first hinge shaft;

[0018] The movable oil cylinder is divided into two sealed first and second cavities by a piston. A piston spring is installed in the first cavity, and the piston spring applies elastic force to the piston to push the piston toward the second cavity. The first and second cavities are filled with hydraulic oil.

[0019] The first cavity and the second cavity are respectively connected to the first outlet and the second outlet of the liquid supply valve. The liquid supply valve includes a valve body, a valve plate, a valve core, a valve core spring, an adjusting piston, and an adjusting rod. The valve body is respectively provided with a first outlet and a second outlet, a first inlet and a second inlet, a first side flow channel and a second side flow channel, a first valve hole and a second valve hole. The first valve hole and the second valve hole together constitute a complete valve hole. A valve core is sealed in the valve hole, and the valve core divides the valve hole into the first valve hole and the second valve hole.

[0020] The first and second outlets, the first and second inlets, the first and second side flow channels are all connected to the valve hole, the first side flow channel is connected to the first inlet, and the second side flow channel is connected to the second inlet; the first side flow channel and the second side flow channel are respectively opposite to the first outlet and the second outlet; the valve plate is mounted and fixed on the valve body and seals the side walls of the first and second side flow channels;

[0021] The valve core is provided with a first annular groove at each end, and the valve core is also provided with a second annular groove, a third annular groove, a fourth annular groove, a fifth annular groove, a first radial through hole, a second radial through hole, and an axial hole. The first radial through hole penetrates the valve core at the second annular groove; the second radial through hole penetrates the valve core at the fifth annular groove; the axial hole connects the first radial through hole and the second radial through hole.

[0022] The second outlet and the second side flow channel are connected to one of the first ring groove, the fifth ring groove, and the fourth ring groove close to the third ring groove, and the first outlet and the first side flow channel are connected to one of the first ring groove, the second ring groove, and the third ring groove close to the second ring groove.

[0023] The utility model also discloses a rotary tiller, which comprises the overload passive yielding structure.

[0024] The beneficial effects of the utility model are:

[0025] The overload protection module of this utility model utilizes an overload spring and a booster cylinder to increase the resistance to passive overload lifting, thereby enhancing the overload lifting force. When using a booster cylinder, a Hall effect sensor detects the distance to the corresponding magnet to determine whether the corresponding overload cylinder needs to be raised for further overload protection. This design primarily enables passive yielding when overload pressure is low, and active yielding when overload pressure is high, thereby achieving more flexible overload protection. This provides emergency overload protection while ensuring long-term stable operation, significantly improving equipment safety.

[0026] The structure of the field leveler of the present invention is very simple. When the hardness of the land is inconsistent or the land is uneven, resulting in different sinking depths of the crawlers on both sides, which causes the rotary tiller to tilt, the scraper of the field leveler can flexibly adapt to the ground under the action of the middle rotating shaft and the adjustment modules on both sides to scrape the land flat. Compared with the existing field levelers, it not only has a certain overall lifting and giving way function, but also adds a degree of freedom that can rotate at both ends, thereby greatly improving the adaptability to different fields for easy use. After the damping component of the present invention is replaced with a movable oil cylinder, it can have a hydraulic spring function and a hydraulic cylinder adjustment function in combination with the liquid supply valve, thereby greatly increasing the flexibility of the scraper adjustment to improve the adaptability to different usage scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1-Figure 5 It is a structural diagram of embodiment 1;

[0028] Figure 6-Figure 7 It is a schematic diagram of the structure of the rotary tillage part 130 and the field leveling device 300;

[0029] Figure 8-Figure 9 It is a schematic diagram of 300 structures of Hirataware;

[0030] Figure 10 is a structural schematic diagram of the damping assembly 400;

[0031] Figure 11 It is a structural diagram of embodiment 2;

[0032] Figure 12 is a structural diagram of embodiment 3;

[0033] Figure 13 is a structural diagram of embodiment 4;

[0034] Figure 14 It is a structural diagram of the liquid supply valve in the fourth embodiment;

[0035] Figure 15 is a structural diagram of embodiment 5;

[0036] Figure 16 is a structural diagram of embodiment 6;

[0037] Figure 17 It is a cross-sectional view of the center plane where the axis of the booster cylinder 740 is located. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention. Example 1

[0039] See also Figures 1-10 The rotary tiller of this embodiment includes a body 100, a rotary tillage shield 130, and a field leveling device 300. The body 100 is hinged to the cylinder body of the rotary tillage cylinder 210 through a body pin 101. A rotary tillage pin 212 is installed on the rotary tillage cylinder shaft 211 of the rotary tillage cylinder 210. The rotary tillage pin 212 is installed in the rotary tillage clearance groove 121 and can be slidably assembled with it relative to the rotary tillage clearance groove 121. The rotary tillage clearance groove 121 is set on the rotary tillage clearance seat 120, and the rotary tillage clearance seat 120 is installed and fixed on the rotary tillage frame 110. One end of the rotary tillage frame 110 is hinged to the body 100 through the rotary tillage frame shaft 111, and the other end is fixed to the rotary tillage shield 130.

[0040] The rotary tillage shield 130 is provided with a shaft seat 132, and the rotary tillage shield 130 is hinged to the housing of the flat field oil cylinder 220 via the shield rotating shaft 131. The flat field oil cylinder 220 is provided with a flat field pin 222 on the flat field oil cylinder shaft 221. The flat field pin 222 is inserted into the flat field clearance groove 141 and can be slidably assembled with the flat field clearance groove 141. The flat field clearance groove 141 is provided on the flat field clearance seat 140, and the flat field clearance seat 140 is fixed to the flat field frame 150. The flat field device 300 is installed on the flat field frame 150. The flat field frame 150 is provided with a rotary tillage shield 130 via the shaft seat 132 so as to be rotatable relative to the circumference.

[0041] The leveling device 300 includes a scraper 310, an intermediate rotating shaft 320, a leveling pin seat 330, a leveling shaft seat 340, and a damping assembly 400. The intermediate rotating shaft 320 is installed on the leveling shaft seat 340, and the leveling shaft seat 340 is fixed on the leveling frame 150. The intermediate rotating shaft 320 and the middle part of the scraper 310 can be assembled in a circular rotation. There are two leveling pin seats 330 and they are respectively installed on both sides of the scraper 310 located on the leveling shaft seat 340. Each leveling pin seat 330 is respectively assembled with a corresponding damping assembly 400.

[0042] The damping assembly 400 includes a damping rod 410, a damping spring 420, a rod seat 430, and a rod pin 440. One end of the damping rod 410 is hinged to the Hirata pin seat 330 through the Hirata pin seat pin 331. The other end of the damping rod 410 is assembled with the rod pin 440, and the damping spring 420 is installed on the rod seat 430 and then passes through the rod seat. A rod seat shaft 431 is provided on the rod seat 430, and the rod seat shaft 431 is hinged to the mounting seat 160. The mounting seat 160 is installed and fixed on the Hirata frame 150. The two ends of the damping spring 420 are respectively tightened on the mounting seat 160 and the rod pin 440, thereby providing elastic damping for the movement of the damping rod 410 toward the mounting seat 160.

[0043] See also Figure 8 , which is the initial state. At this time, the left and right ends of the scraper 310 are at the same height. During the process of leveling the field, if the scraper 310 as a whole encounters a hard object, it will push the two damping rods 410 to squeeze the damping spring 420 to make way. When the hardness of the land is inconsistent or the land is uneven, resulting in different sinking depths of the crawlers on both sides, which causes the rotary tiller to tilt, the end subjected to greater force will lift upward, thereby driving the corresponding damping rod 410 to squeeze the damping spring 420, while the other end rotates downward through the intermediate rotating shaft 320 to automatically adapt to the ground and level the field. Of course, when the scraper 310 is subjected to a common upward force, it will still squeeze the damping spring 420 upward and lift it. At the same time, the damping spring is used to maintain the pressure of the scraper 310 pressing down on the field, thereby ensuring the leveling effect. When the soil conditions at both ends of the scraper are consistent, the scraper automatically resets under the action of the damping spring.

[0044] See also Figure 5, the rotary tillage clearance groove 121 is larger than the rotary tillage pin 212, the flat field clearance groove 141 is larger than the flat field pin 222, and when the rotary tillage frame 110 rotates upward under the action of external force and the rotary tillage cylinder shaft 211 does not move, the rotary tillage clearance groove 121 can rotate a certain angle along the rotary tillage pin 212, thereby achieving rapid overload clearance. During tillage, the weight of the entire rotary tillage part can be used to ensure the rotary tillage depth. When the flat field clearance seat 140, the flat field frame 150, and the scraper 310 rotate upward under the action of external force and the flat field cylinder shaft 221 does not move, the flat field clearance groove 141 can rotate a certain angle along the flat field pin 222, thereby achieving rapid overload clearance. When leveling the field, the weight of the leveling device can meet the needs of leveling the field. This design can achieve passive overload giving way of the rotary tillage part and the field leveling device, thereby reducing the impact on the rotary tillage cylinder 210 and the field leveling cylinder 220, and the number of times the rotary tillage cylinder 210 and the field leveling cylinder 220 control the rotary tillage part and the field leveling device to be lifted. It is more convenient to use and has a simple structure, and basically does not increase the overall cost.

[0045] In addition, this design can effectively ensure that the rotary tillage shield 130 and the flat field frame 150 rotate toward the ground until the maximum rotation angle is reached, and the rotary tillage shield 130 and the flat field frame 150 can still be lifted upward to achieve overload and give way, that is to say, the overload protection of giving way can be maintained under the premise of achieving any rotation angle. At the same time, when the rotary tillage shield 130 and the flat field frame 150 rotate toward the ground, the rotary tillage pin 212 and the flat field pin 222 remain taut with one end of the corresponding rotary tillage and give way groove 121 and the flat field give way groove 141 to prevent the rotary tillage part and the flat field device from suddenly falling and causing a safety hazard. At the same time, when the rotary tillage cylinder 210 and the flat field cylinder 220 need to pull up the rotary tillage part and the flat field device, the rotary tillage pin 212 and the rotary tillage and give way groove 121 and the flat field pin 222 and the flat field give way groove 141 can be quickly lifted without moving, thereby effectively and quickly coping with the situation of a large impact. There is no empty space when the rotary tillage cylinder 210 and the field leveling cylinder 220 drive the rotary tillage part and the field leveling device to rotate downward, so that the angle of rotation of the rotary tillage part and the field leveling device toward the ground can be controlled more accurately. Example 2

[0046] See also Figure 11, which is a schematic diagram of the improved structure of the flat device. In this embodiment, one of the two damping assemblies 400 in the first embodiment is replaced by a damping cylinder 350. The damping cylinder shaft 351 of the damping cylinder 350 is hinged to the corresponding flat pin seat 330 through the flat pin seat shaft 331. The outer shell of the damping cylinder 350 is hinged to the damping cylinder seat 360 through the damping cylinder pin 362. The damping cylinder seat 360 is provided with a damping cylinder seat shaft 361, which is installed in the protective sleeve 370 and assembled with the input end of the tension and pressure sensor 510. The tension and pressure sensor 510 is installed and fixed in the protective sleeve 370. A protective sleeve pin 371 is provided on the outer wall of the protective sleeve 370. The protective sleeve pin 371 is installed in the corresponding mounting seat 160 and rotatably assembled with it.

[0047] The damping cylinder 350 can drive the damping cylinder shaft 351 to axially extend and retract. In this embodiment, the damping cylinder 350 can be an oil cylinder, an electric cylinder, a pneumatic cylinder, or the like, as long as it can theoretically drive the damping cylinder shaft 351 to axially extend and retract. This design allows the rotation angle of the scraper 310 about the intermediate rotary axis 320 to be controlled by controlling the extension and retraction of the damping cylinder shaft 351, rather than relying on the damping spring 420 as in the first embodiment. This allows for manual adjustment to achieve a better field-leveling effect.

[0048] It can be stated that Figure 11 and Figure 1-10 The Hirata ware in the painting is not of the same structure and can be understood as a new structural choice. Example 3

[0049] See also Figure 12 The difference between this embodiment and the second embodiment is that the damping assembly 400 is also replaced with a damping cylinder 350, thereby utilizing the cooperation of the two damping cylinders 350 to adjust the rotation angle of the scraper 310. This method can further enhance the control of the rotation angle of the scraper 310, thus adapting to some usage scenarios where it is necessary to prioritize maintaining the rotation angle of the scraper 310.

[0050] In this embodiment, the pulling pressure sensor in the second embodiment can be replaced by a pressure sensor 520, thereby using two pressure sensors to respectively detect the pressure of the two damping cylinders 350 to determine whether the pressure at both ends of the scraper is balanced. Once the pressure difference reaches the preset threshold, the corresponding damping cylinder 350 is controlled to operate, thereby maintaining the dynamic angle adjustment and overload protection at both ends of the scraper.

[0051] It can be stated that Figure 12 and Figure 1-10 The Hirata ware in the painting is not of the same structure and can be understood as a new structural choice. Example 4

[0052] See also Figure 13-14The difference between this embodiment and the first embodiment is that at least one of the damping assemblies 400 is replaced by a movable oil cylinder 530. The movable oil cylinder 530 is sealed inside and has a piston 541 slidably installed thereon. The piston 541 is fixedly mounted on one end of the movable oil cylinder shaft 540. The other end of the movable oil cylinder shaft 540 is hinged to the Hirata pin seat 330 through the Hirata pin seat pin 331. A cylinder body mounting shaft 532 is mounted on the outer wall of the movable oil cylinder 530. A cylinder body pin shaft 5321 is provided on the cylinder body mounting shaft 532. The cylinder body pin shaft 5321 is installed in the corresponding mounting seat 160 and can be assembled with it in a circular rotation.

[0053] The movable oil cylinder 530 is divided into two sealed first cavities 531 and second cavities 532 by a piston 541. A piston spring 550 is installed in the first cavity 531. The piston spring 550 applies an elastic force to the piston 541 to push the second cavity 532, and the first cavity 531 and the second cavity 532 are filled with hydraulic oil.

[0054] The first cavity 531 and the second cavity 532 are respectively connected to the first outlet 617 and the second outlet 618 of the liquid supply valve. The liquid supply valve includes a valve body 610, a valve plate 620, a valve core 630, a valve core spring 640, an adjusting piston 650, and an adjusting rod 660. The valve body 610 is respectively provided with a first outlet 617 and a second outlet 618, a first inlet 614 and a second inlet 616, a first side flow channel 615 and a second side flow channel 617, a first valve hole 611 and a second valve hole 612. The first valve hole 611 and the second valve hole 612 together constitute a complete valve hole. A valve core 630 is sealed and slidably installed in the valve hole. The valve core 630 divides the valve hole into the first valve hole 611 and the second valve hole 612.

[0055] The first outlet 617 and the second outlet 618, the first inlet 614 and the second inlet 616, the first side channel 615 and the second side channel 617 are all connected to the valve hole, the first side channel 615 is connected to the first inlet 614, and the second side channel 617 is connected to the second inlet 616; the first side channel 615 and the second side channel 617 are opposite to the first outlet 617 and the second outlet 618 respectively.

[0056] Limiting rings 613 are installed in the first valve hole 611 and the second valve hole 612 respectively. The valve plate 620 is fixed on the valve body 610 and seals the side walls of the first side flow channel 615 and the second side flow channel 617.

[0057] A first annular groove 631 and a spring rod 639 are respectively provided on both ends of the valve core 630, and a second annular groove 632, a third annular groove 633, a fourth annular groove 634, a fifth annular groove 635, a first radial through hole 636, a second radial through hole 637 and an axial hole 638 are also respectively provided on the valve core 630. The first radial through hole 636 penetrates the valve core at the second annular groove 632, so that the two sides of the second annular groove 632 are connected; the second radial through hole 637 penetrates the valve core at the fifth annular groove 635, so that the two sides of the fifth annular groove 635 are connected; the axial hole 638 connects the first radial through hole 636 and the second radial through hole 637.

[0058] The second outlet 618 and the second side channel 617 are connected to one of the first annular groove 631, the fifth annular groove 635, and the fourth annular groove 634 close to the third annular groove 635, and the first outlet 617 and the first side channel 615 are connected to one of the first annular groove 631, the second annular groove 632, and the third annular groove 633 close to the second annular groove 632.

[0059] The spring rods 639 at each end are assembled with one end of the corresponding valve core spring 640. The other end of the valve core spring 640 is pressed or assembled with the end face of the corresponding regulating piston 650. The regulating piston 650 is sealed and slidably installed in the valve hole. The regulating piston 650 is assembled with one end of the corresponding regulating rod 660. The other end of the regulating rod 660 extends through the valve body 610 and can be screwed into the valve body via a threaded assembly. During use, adjusting the depth of the regulating rod 660 into the valve hole can control the initial compression length of the corresponding valve core spring 640, that is, the pushing resistance of the valve core 630.

[0060] Figure 14 The illustration shows the initial state, in which the second outlet 618 and the second side channel 617 are connected to the fifth annular groove 635, and the first outlet 617 and the first side channel 615 are connected to the second annular groove 632. This means that the first side channel 615 is connected to the first outlet 617 via the first radial hole 636 and the second annular groove 632, while the second side channel 616 is connected to the second outlet 618 via the second radial hole 637 and the fifth annular groove 635. At this point, the movement of the piston 541 causes the hydraulic oil in the first and second cavities 531, 532 to circulate through these channels, thereby providing hydraulic damping. The movable cylinder 530 now functions similarly to the damping assembly 400.

[0061] When hydraulic pressure is required to move the piston 541, that is, when the movable cylinder shaft 540 moves axially, oil is introduced into one of the first inlet 614 and the second inlet 615. The hydraulic oil enters the corresponding valve hole, the first side flow channel, or the second side flow channel. The cross-section of the first radial hole 636 and the second radial hole 637 is no larger than 1 / 2 of the valve hole. Therefore, the hydraulic pressure mainly acts on the valve core 630, thereby pushing the valve core 630 to squeeze the valve core spring on one side. At this time, there are two states:

[0062] When oil flows into the first inlet 614 and oil returns to the second inlet 616, the valve core moves downward until it is pressed against the limit ring below. At this time, the first annular groove 631 above is directly connected to the first outlet 617, and the fourth annular groove 634 is directly connected to the second outlet 618, thereby cutting off the connection between the first outlet 617 and the second outlet 618 through the axial hole 638, so as to quickly drive the piston downward.

[0063] When oil flows into the second inlet and oil returns to the first inlet, the valve core moves upward until it is pressed against the upper limit ring. At this time, the third ring groove 633 is connected to the first outlet and the lower first ring groove 631 is connected to the second outlet, thereby cutting off the connection between the first outlet 617 and the second outlet 618 through the axial hole 638, so as to quickly drive the piston upward.

[0064] This design allows the movable cylinder 530 to provide active damping when not being driven by hydraulic oil (in its initial state). However, when hydraulic oil is required, it can directly drive the movable cylinder shaft 540 to adjust the scraper blade angle. This greatly increases operational flexibility and adaptability to terrain. After adjusting the scraper blade angle through piston movement, the hydraulic oil stops and the valve core resets, allowing the movable cylinder 530 to resume providing active damping. This function is similar to that of the first embodiment, thus maintaining a certain degree of flexibility.

[0065] Preferably, a knob 661 is mounted on the regulating rod 660, and the knob is used to rotate the regulating shaft 660 to adjust the depth of the regulating shaft 660 inserted into the valve hole.

[0066] It can be stated that Figure 13 and Figure 1-10 The Hirata ware in the painting is not of the same structure and can be understood as a new structural choice. Example 5

[0067] See also Figure 15In order to increase the overload protection force, in this embodiment, a first spring seat 710 is installed on the rotary tillage yield seat 120 and a second spring seat 720 is installed on the body 100. The two ends of the first spring seat 710 and the second spring seat 720 are respectively assembled with the two ends of the overload spring 730, so that the overload spring 730 increases the resistance of the rotary tillage yield seat 120 to rotate toward the body to improve the overload protection force.

[0068] The leveling field clearance seat 140 and the rotary tillage shield 130 can be respectively assembled with another first spring seat 710 and another second spring seat 720. The first spring seat 710 and the second spring seat 720 are respectively assembled with another overload spring 730 to increase the resistance of the leveling field frame 150 to rotate toward the rotary tillage shield 130, that is, the overload protection force for lifting the scraper 310. Example 6

[0069] See also Figure 16-17 In this embodiment, the first spring seat 710, the second spring seat 720, and the overload spring 730 in the fifth embodiment are replaced with a boosting cylinder 740. A hinge block 703 is installed on the boosting cylinder shaft 741 of the boosting cylinder 740. The hinge block 703 is hinged to the rotary tillage seat 120 through the first hinge shaft 701, and the outer shell of the boosting cylinder 740 is hinged to the fuselage through the first hinge shaft 702.

[0070] A slip ring 760 is engaged and slidably installed inside the boosting cylinder 740. The slip ring 760 divides the boosting cylinder 740 into a first sliding hole 742 and a second sliding hole 743. A slip ring spring 750 is installed in the second sliding hole 743. The slip ring 760 is assembled with one end of the boosting cylinder shaft 741, and the other end of the boosting cylinder shaft 741 passes through the boosting cylinder 740.

[0071] A magnet 770 is installed on one end of the booster cylinder shaft 741 assembled with the slip ring 760. A sensor base 780 is installed in the booster cylinder 740, and a Hall sensor 790 is installed on the sensor base 780. The Hall sensor 790 connects the signal to the industrial computer of the fuselage through a wire. The Hall sensor 790 is used to detect the distance between the magnet 770 and it.

[0072] When the overload force is relatively small, the rotary tillage groove 121 can be rotated relative to the rotary tillage pin 212, and the force cylinder shaft 741 is stretched during the process.

[0073] When the overload pressure is too high, the length of the booster cylinder shaft 741 is stretched to a preset threshold value, and the rotary tillage cylinder 210 is started to drive the rotary tillage cylinder shaft to contract and actively lift the rotary tillage part (rotary tillage shield part).

[0074] The leveling position 140 and the rotary tillage shield 130 can be respectively assembled with another first hinge shaft 701 and another second hinge pin 702. The first hinge shaft 701 and the second hinge pin 702 are hingedly connected to the hinge block 703 of another boosting cylinder 740 and the outer shell of the boosting cylinder 740. A Hall sensor can then be used to detect the distance between the other magnets to determine whether the leveling cylinder needs to be activated to lift the scraper to achieve a position reduction when the overload pressure is too high.

[0075] This design is mainly to achieve passive giving way when the overload pressure is small, and active giving way when the overload pressure is large, so as to achieve more flexible overload protection, and to have the function of emergency overload protection under the premise of ensuring long-term stable operation, thereby greatly improving the safety of the equipment.

[0076] Of course, the booster cylinder 740 in Example 6 can be replaced with a movable oil cylinder 530, and a liquid supply valve can be used to supply liquid. This can effectively control the force of overload lifting on the one hand, and on the other hand, it will not affect the normal lifting and lowering of the rotary tillage guard 130 and the field leveling frame 150, because liquid can be supplied to the movable oil cylinder 530 to control the extension and retraction of the movable oil cylinder shaft 540.

[0077] It should be noted that, unless otherwise specified, the technical or scientific terms used in this application should have the common meanings understood by those skilled in the art to which this application belongs. The drawings in the specification of this application are schematic diagrams of the structure, not specific engineering drawings or dimension drawings, and are only used to express the corresponding structure and principles.

[0078] The above description is merely a preferred embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. An overload passive yielding structure, characterized by: It includes a rotating part, a fixed part, and a power cylinder. The rotating part can rotate relative to the fixed part, and a clearance groove is provided on the rotating part; the clearance groove is assembled with a pin shaft, the pin shaft is installed on the power cylinder shaft, the power cylinder shaft is installed in the power cylinder, and the power cylinder drives the power cylinder shaft to axially extend and retract to drive the rotating part to rotate relative to the fixed part; the clearance groove is larger than the pin shaft, so that the clearance groove can rotate relative to the pin shaft when the rotating part rotates passively and the power cylinder shaft does not move.

2. The overload passive yield structure according to claim 1, characterized in that: The rotating part and the fixed part are respectively assembled with two ends of an overload spring, and the overload spring is used to increase the resistance to rotation of the rotating part.

3. The overload passive yield structure according to claim 1, characterized in that: It also includes a boosting cylinder, a boosting cylinder shaft of which is provided with a hinge block, the hinge block being hinged to the rotating part via a first hinge shaft, and a housing of the boosting cylinder being hinged to the fixed part via the first hinge shaft; A slip ring is engaged and slidably installed inside the boosting cylinder, and the slip ring divides the inside of the boosting cylinder into a first sliding hole and a second sliding hole. A slip ring spring is installed in the second sliding hole. The slip ring is assembled with one end of the boosting cylinder shaft, and the other end of the boosting cylinder shaft passes through the boosting cylinder.

4. The overload passive yield structure according to claim 3, characterized in that: A magnet is installed on one end of the booster cylinder shaft and the slip ring assembly, a sensor seat is installed in the booster cylinder, and a Hall sensor is installed on the sensor seat. The Hall sensor connects the signal to the industrial computer of the fuselage through a wire, and the Hall sensor is used to detect the distance between the magnet and it.

5. The overload passive yield structure according to any one of claims 1 to 4, characterized in that: The fixed part is the body of the rotary tiller, the rotating part is the rotary tillage seat, the power cylinder is the rotary tillage cylinder, the power cylinder shaft is the rotary tillage cylinder shaft, and the pin shaft is the rotary tillage pin shaft. The rotary tillage pin shaft is installed on the rotary tillage groove and can be slidably assembled with it relative to the rotary tillage groove. The rotary tillage groove is arranged on the rotary tillage seat, and the rotary tillage seat is installed and fixed on the rotary tillage frame. One end of the rotary tillage frame is hinged to the fuselage through the rotary tillage frame shaft, and the other end is fixed to the rotary tillage shield.

6. The overload passive yield structure according to claim 5, characterized in that: The rotary tillage clearance groove is larger than the rotary tillage pin shaft. When the rotary tillage frame rotates upward under the action of external force and the rotary tillage cylinder shaft does not move, the rotary tillage clearance groove rotates along the rotary tillage pin shaft.

7. The overload passive yield structure according to any one of claims 1 to 4, characterized in that: The fixed part is the rotary tillage guard, the rotating part is the flat field frame, the power cylinder is the flat field oil cylinder, the power cylinder shaft is the flat field oil cylinder shaft, and the pin shaft is the flat field pin shaft. The flat field pin shaft is installed on the flat field oil cylinder shaft. The flat field pin shaft is installed in the flat field give way groove and can be slidably assembled relative to it. The flat field give way groove is arranged on the flat field give way seat, and the flat field give way seat is installed and fixed on the flat field frame; the flat field frame and the rotary tillage guard are rotatably assembled.

8. The overload passive yield structure according to claim 7, characterized in that: The Hirata give way groove is larger than the Hirata pin shaft. When the Hirata give way seat, the Hirata frame and the scraper rotate upward under the action of external force and the Hirata cylinder shaft does not move, the Hirata give way groove rotates along the Hirata pin shaft.

9. The overload passive yield structure according to claim 3 or 4, characterized in that: The booster cylinder is replaced by a movable oil cylinder, which is supplied with liquid by a liquid supply valve; the movable oil cylinder is sealed inside and has a piston slidably mounted thereon, which is fixed to one end of the movable oil cylinder shaft; the movable oil cylinder shaft is hinged to the rotating part, and the outer shell of the movable oil cylinder is hinged to the fixed part via a first hinge shaft; The movable oil cylinder is divided into two sealed first and second cavities by a piston. A piston spring is installed in the first cavity, and the piston spring applies elastic force to the piston to push the piston toward the second cavity. The first and second cavities are filled with hydraulic oil. The first cavity and the second cavity are respectively connected to the first outlet and the second outlet of the liquid supply valve. The liquid supply valve includes a valve body, a valve plate, a valve core, a valve core spring, an adjusting piston, and an adjusting rod. The valve body is respectively provided with a first outlet and a second outlet, a first inlet and a second inlet, a first side flow channel and a second side flow channel, a first valve hole and a second valve hole. The first valve hole and the second valve hole together constitute a complete valve hole. A valve core is sealed in the valve hole, and the valve core divides the valve hole into the first valve hole and the second valve hole. The first and second outlets, the first and second inlets, the first and second side flow channels are all connected to the valve hole, the first side flow channel is connected to the first inlet, and the second side flow channel is connected to the second inlet; the first side flow channel and the second side flow channel are respectively opposite to the first outlet and the second outlet; the valve plate is mounted and fixed on the valve body and seals the side walls of the first and second side flow channels; The valve core is provided with a first annular groove at each end, and the valve core is also provided with a second annular groove, a third annular groove, a fourth annular groove, a fifth annular groove, a first radial through hole, a second radial through hole, and an axial hole. The first radial through hole penetrates the valve core at the second annular groove; the second radial through hole penetrates the valve core at the fifth annular groove; the axial hole connects the first radial through hole and the second radial through hole. The second outlet and the second side flow channel are connected to one of the first ring groove, the fifth ring groove, and the fourth ring groove close to the third ring groove, and the first outlet and the first side flow channel are connected to one of the first ring groove, the second ring groove, and the third ring groove close to the second ring groove.

10. A rotary tiller, characterized by: The invention is applied with the overload passive yielding structure described in any one of claims 1 to 9.

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