Automatic coaxial alignment testing device for lawn mower heads and aging equipment for the entire lawn mower

Abstract

This utility model discloses an automatic coaxial centering test device for lawnmower heads and an aging test device for lawnmowers, relating to the field of aging test technology for garden machinery. The automatic coaxial centering test device for lawnmower heads includes a guide assembly and a connecting assembly. The guide assembly includes a lower housing with a guide groove. The connecting assembly includes an upper housing and an inner rotor. The upper housing is inserted into the guide groove and has a rotating hole in which the inner rotor is rotatably connected. The inner rotor is configured to be drive-connected to the input shaft of the lawnmower aging test device and is detachably connected to the lawnmower head. The guide groove gradually narrows along the insertion direction of the upper housing. The shape of the outer wall of the upper housing matches the shape of the guide groove wall, so that the inner rotor is coaxial with the input shaft when the upper and lower housings are inserted. This utility model aims to improve the efficiency of aging tests for lawnmowers.

Description

Technical Field

[0001] This utility model relates to the field of aging test technology for garden machinery, and in particular to an automatic centering and coaxial testing device for lawn mower heads and an aging equipment for the entire lawn mower. Background Technology

[0002] A lawnmower is a mechanical tool used for trimming lawns, vegetation, etc., and includes a blade disc, engine, wheels, walking mechanism, blades, handle, and control unit. With the continuous expansion of urban green areas, the market share of lawnmowers is growing rapidly. To ensure factory reliability, whole-machine aging testing has become an essential step in the lawnmower production line.

[0003] The existing aging test benches generally adopt the "manual placement + rigid coupling" mode: the operator moves the mowing head to the test bench, then uses visual inspection or simple positioning pins to align the rotating shaft of the mowing head with the input shaft of the torque sensor or hysteresis brake of the test bench, and finally locks the rigid coupling and starts the rotation aging program.

[0004] However, during the alignment process, the operator needs to repeatedly adjust the mowing head to keep the alignment deviation between the mowing head's shaft and the axis of the bench torque sensor or hysteresis brake within the allowable range, resulting in low testing efficiency of the lawnmower. Utility Model Content

[0005] The main purpose of this invention is to propose an automatic centering and coaxial testing device for the mower head and an aging equipment for the entire mower, aiming to improve the efficiency of aging tests for mowers.

[0006] To achieve the above objectives, the present invention proposes an automatic centering and coaxial testing device for lawn mower heads, which is applied to the aging equipment of lawn mowers. The automatic centering and coaxial testing device for lawn mower heads includes: The guide assembly includes a lower housing having a guide groove formed thereon; and A connecting assembly includes an upper housing and an inner rotor; the upper housing is inserted into the guide groove; the upper housing has a rotating hole, and the inner rotor is rotatably connected to the rotating hole; the inner rotor is configured to be drively connected to the input shaft of the lawnmower aging device and is detachably connected to the mowing head; The guide groove gradually narrows along the insertion direction of the upper housing; the shape of the outer wall of the upper housing is adapted to the shape of the groove wall of the guide groove so that the inner rotor is coaxial with the input shaft when the upper housing and the lower housing are inserted.

[0007] In one embodiment, the connecting assembly further includes an iron ring and a magnetic component, the magnetic component being disposed on the bottom wall of the guide groove; the iron ring being disposed on one end of the upper housing near the magnetic component and magnetically connected to the magnetic component.

[0008] In one embodiment, the guide assembly includes a lower magnetic coupling, and the connecting assembly includes an upper magnetic coupling, the upper magnetic coupling and the lower magnetic coupling being magnetically connected; the lower magnetic coupling is disposed in the guide groove and configured to be drive-connected to the input shaft; the upper magnetic coupling is drive-connected to the inner rotor.

[0009] In one embodiment, the connecting assembly further includes a bearing, the outer ring of which is disposed on the inner wall of the rotating hole, and the inner ring of which is sleeved on the inner rotor.

[0010] This utility model also proposes an aging device for a lawnmower, including a frame, and a lifting aging module, a rotating aging module, and the aforementioned automatic centering and coaxial testing device for the lawnmower head, all mounted on the frame. The lifting aging module is used to raise and lower the rotating aging module. The rotary aging module includes the input shaft, which is connected to the inner rotor via a transmission. The rotary aging module is used to simulate the mowing load or accelerated aging load of the mowing head, and the lifting aging module is used to simulate the damping when the mowing head is lifted or lowered.

[0011] In one embodiment, the lifting aging module includes a slide rail disposed on the frame and a slider locking mechanism slidably connected to the slide rail, and the rotating aging module is disposed on the slider locking mechanism.

[0012] In one embodiment, the slider locking mechanism includes a slider and a screw, and the lifting aging module further includes a connecting plate; The rotating aging module is located on the connecting plate. The slide rail is slidably connected to the slider. The screw passes through the slider and is screwed to the connecting plate. The slider locking mechanism is configured to adjust the tightness of the sliding connection between the slider and the slide rail when the screw is turned, so as to simulate the adjustment of the damping magnitude when the mowing head is raised and lowered.

[0013] In one embodiment, the lifting aging module further includes a counterweight mechanism, which includes a connecting bar, at least one counterweight block, and at least one fixed pulley. Each of the fixed pulleys is rotatably connected to the frame. One end of the connecting bar is located on the connecting plate, and the other end passes around each of the fixed pulleys and is connected to the topmost counterweight block. The counterweight mechanism is used to simulate the constant load when the mowing head is raised and lowered.

[0014] In one embodiment, the counterweight mechanism includes at least one screw and a plurality of the counterweight blocks, each screw passing through all the counterweight blocks and engaging with a nut to limit the position of each counterweight block.

[0015] In one embodiment, the rotary aging module further includes a hysteresis brake and a torque meter, both disposed on the frame; The input shaft, the torque meter, and the hysteresis brake are sequentially connected in a transmission manner; the hysteresis brake and the lifting aging module are fastened together by screws. The hysteresis brake is used to simulate the mowing load or accelerated aging load of the mowing head, and the torque meter is used to monitor the rotational torque, power and speed of the mowing head.

[0016] In the technical solution of this utility model, the automatic centering and coaxial testing device for the mowing head includes a guide assembly and a connecting assembly. The guide assembly includes a lower housing with a guide groove. The connecting assembly includes an upper housing and an inner rotor. The upper housing is inserted into the guide groove. The upper housing has a rotating hole, and the inner rotor is rotatably connected to the rotating hole. The inner rotor is configured to be drivenly connected to the input shaft of the mowing machine aging device and is detachably connected to the mowing head. The guide groove gradually narrows along the insertion direction of the upper housing. The shape of the outer wall of the upper housing matches the shape of the groove wall of the guide groove so that the inner rotor is coaxial with the input shaft when the upper housing and the lower housing are inserted. In the technical solution of this utility model, by setting a guide groove that gradually shrinks along the insertion direction in the lower housing, and adapting the outer contour of the upper housing to the wall of the guide groove, the tapering wall of the guide groove continuously applies a self-centering radial and angular corrective force to the upper housing during the insertion of the upper housing into the lower housing. This force always points to the geometric center line of the guide groove, thereby forcing the inner rotor axis to automatically coincide with the input shaft axis at the moment of insertion. Since this centering action occurs synchronously with the insertion action, no additional visual adjustment or locking steps are required, thus directly eliminating the repeated correction and rigid connection operations necessary to achieve coaxiality in the prior art. High-precision centering can be completed simultaneously with a single insertion, thereby reducing the number of operation steps in the entire aging test process, eliminating auxiliary time, reducing human dependence, and improving the efficiency of lawnmower aging test. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 A schematic diagram of an embodiment of the automatic centering and coaxial testing device for lawn mower heads provided by this utility model; Figure 2 A cross-sectional view of the automatic centering and coaxial testing device for the lawn mower head; Figure 3 A schematic diagram of the structure of an embodiment of the lawnmower aging equipment provided by this utility model; Figure 4 A schematic diagram of another embodiment of the aging equipment for a lawnmower; Figure 5 This is a schematic diagram of the counterweight mechanism in the aging equipment of a lawnmower. Figure 6 This is a schematic diagram of the slider locking mechanism in the aging equipment of a lawnmower.

[0019] Explanation of icon numbers: 1000-Automatic coaxial testing device for mowing head centering; 11-Lower housing; 11a-Guide groove; 12-Lower magnetic coupling; 21-Upper housing; 21a-Rotating hole; 22-Inner rotor; 23-Iron ring; 24-Upper magnetic coupling; 25-Bearing; 26-Magnetic component; 2000-Aging equipment for the entire mowing machine; 3-Frame; 4-Lifting aging module; 41-Slide rail; 421-Slider; 422-Screw; 43-Connecting plate; 441-Counterweight; 442-Connecting strip; 443-Fixed pulley; 444-Screw; 5-Rotational aging module; 51-Input shaft; 52-Hysteresis brake; 53-Torque meter.

[0020] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0022] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0023] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0024] In existing technologies, the aging test of lawnmowers generally uses a combination of manual placement and rigid couplings. Operators need to adjust the alignment accuracy of the mowing head shaft and the input shaft of the test bench by visual inspection or simple positioning pins. The repeated calibration process limits the testing efficiency.

[0025] To address the aforementioned problems, this utility model proposes an automatic centering and coaxial testing device 1000 for lawn mower heads. Figure 1 and Figure 2 This is a schematic diagram of an embodiment of the automatic centering and coaxial testing device 1000 for lawn mower heads provided by this utility model.

[0026] Please refer to Figure 1 and Figure 2 This utility model proposes an automatic centering and coaxial testing device 1000 for a mower head, including a guide assembly and a connecting assembly. The guide assembly includes a lower housing 11, which has a guide groove 11a. The connecting assembly includes an upper housing 21 and an inner rotor 22. The upper housing 21 is inserted into the guide groove 11a. The upper housing 21 has a rotating hole 21a, and the inner rotor 22 is rotatably connected to the rotating hole 21a. The inner rotor 22 is configured to be drivenly connected to the input shaft 51 of the mower aging equipment 2000 and is detachably connected to the mower head. The guide groove 11a gradually narrows along the insertion direction of the upper housing 21. The shape of the outer wall of the upper housing 21 is adapted to the shape of the groove wall of the guide groove 11a so that the inner rotor 22 is coaxial with the input shaft 51 when the upper housing 21 is inserted into the lower housing 11.

[0027] The guide groove 11a gradually narrows along the insertion direction, which can be achieved using a wedge-shaped groove structure, with the groove wall inclination angle ranging from 5° to 15°. This design allows the upper housing 21 to undergo radial displacement guided by the groove wall during insertion, ultimately achieving axial alignment. The upper housing 21 and the guide groove 11a are shaped to fit together, and geometric constraints ensure a forced centering effect when they come into contact. The inner rotor 22 is rotatably connected within the rotating hole 21a, which can be achieved using a rolling bearing 25 or a sliding bearing 25 structure. For example, the inner ring of a deep groove ball bearing 25 is interference-fitted with the inner rotor 22. This configuration allows the inner rotor 22 to rotate freely while maintaining coaxiality.

[0028] By providing a guide groove 11a that gradually contracts along the insertion direction in the lower housing 11, and adapting the outer contour of the upper housing 21 to the wall of the guide groove 11a, the tapering wall of the guide groove 11a continuously applies a self-centering radial and angular corrective force to the upper housing 21 during the insertion of the upper housing 21 into the lower housing 11. This force always points towards the geometric center line of the guide groove 11a, thereby forcing the axis of the inner rotor 22 to automatically coincide with the axis of the input shaft 51 at the moment of insertion. Since this alignment action occurs synchronously with the insertion action, no additional visual adjustment or locking steps are required, thus directly eliminating the repeated correction and rigid connection operations necessary to achieve coaxiality in the prior art. High-precision alignment can be completed simultaneously with a single insertion, thereby reducing the number of operation steps in the entire aging test process, eliminating auxiliary time, reducing human dependence, and improving the efficiency of lawnmower aging test.

[0029] Please refer to Figure 2 In one embodiment of the present invention, the connecting assembly further includes an iron ring 23 and a magnetic component 26. The magnetic component 26 is disposed on the bottom wall of the guide groove 11a; the iron ring 23 is disposed on one end of the upper housing 21 near the magnetic component 26 and is magnetically connected to the magnetic component 26.

[0030] By installing a magnetic component 26 on the bottom wall of the guide groove 11a of the lower housing 11 and an iron ring 23 at the corresponding end of the upper housing 21, the two can be quickly axially locked by magnetic attraction at the moment of insertion. This magnetic connection structure not only eliminates the need for additional fastening operations such as traditional threads or pins, but also further shortens the clamping time; the magnetic attraction force continuously provides axial pre-tightening, effectively suppressing axial movement caused by rotational vibration during the test; the magnetic attraction combined with the tapered geometric constraint of the guide groove 11a forms a three-step process of "guidance-centering-attraction" that is completed simultaneously, which not only strengthens the coaxial retention capability of the inner rotor 22 and the input shaft 51, but also avoids stress concentration and wear caused by rigid locking, significantly improving test efficiency, repeatability accuracy and device lifespan. Meanwhile, this structure eliminates the error of manual visual alignment and avoids the thread wear problem caused by bolt tightening. It can realize the rapid automatic alignment of the mowing head and the input shaft 51. No manual intervention is required during the test, and the test efficiency is significantly improved. The cooperation structure of the iron ring 23 and the magnetic component 26 can withstand the axial load generated by the rotation test while ensuring coaxial accuracy, avoiding the displacement deviation of the components caused by vibration, thereby extending the service life of the automatic alignment coaxial test device 1000 for the mowing head.

[0031] It should be noted that the magnetic component 26 can be a neodymium iron boron magnet, an AlNiCo magnet, or other magnetic objects. This invention preferentially uses a neodymium iron boron magnet as the magnetic component 26.

[0032] Please refer to Figure 2 In one embodiment of the present invention, the guide assembly includes a lower magnetic coupling 12, and the connecting assembly includes an upper magnetic coupling 24. The upper magnetic coupling 24 and the lower magnetic coupling 12 are magnetically connected. The lower magnetic coupling 12 is disposed in the guide groove 11a and is configured to be drivenly connected to the input shaft 51. The upper magnetic coupling 24 is drivenly connected to the inner rotor 22.

[0033] The lower magnetic coupling 12 is a transmission component that transmits torque via magnetic force. It is installed at the bottom of the guide groove 11a and remains coaxial with the input shaft 51. The upper magnetic coupling 24 is a component that matches the magnetic poles of the lower magnetic coupling 12. Specifically, it can adopt the same magnetic pole arrangement and is fixed to the end of the inner rotor 22 to achieve power transmission. Magnetic connection refers to axial positioning and torque transmission achieved through the attractive or repulsive forces between magnetic poles. Specifically, it can be achieved through a magnetic pole arrangement with opposite poles facing each other or like poles repelling each other.

[0034] Specifically, when the upper housing 21 is inserted into the guide groove 11a, the upper magnetic coupling 24 and the lower magnetic coupling 12 automatically attract and align under the action of magnetic force, so that the inner rotor 22 and the input shaft 51 are coaxial. In this process, the magnetic force not only drives the inner rotor 22 to rotate synchronously with the input shaft 51, but also compensates for assembly deviations through the self-aligning characteristics between the magnetic poles.

[0035] By utilizing the non-contact transmission characteristics of the magnetic coupling, frictional losses caused by physical contact are eliminated, and the magnetic self-alignment function replaces manual adjustment steps. For example, in existing technologies, operators need to repeatedly correct the coupling position, while this solution only requires pushing the upper housing 21 into the guide groove 11a to automatically complete the alignment, thus avoiding the problem of low testing efficiency caused by repeated manual adjustments. At the same time, non-contact transmission reduces equipment wear and extends the service life of the automatic alignment coaxial testing device 1000 for the mower head.

[0036] Please refer to Figure 2 In one embodiment of the present invention, the connecting assembly further includes a bearing 25, the outer ring of the bearing 25 is disposed on the inner wall of the rotating hole 21a, and the inner ring of the bearing 25 is sleeved on the inner rotor 22.

[0037] In this context, bearing 25 refers to a mechanical component used to support rotating parts and reduce friction. Specifically, it can be a rolling bearing 25 or a sliding bearing 25. Its outer ring is fixed to the inner wall of the rotating hole 21a, and its inner ring mates with the inner rotor 22, enabling the inner rotor 22 to rotate with low resistance within the rotating hole 21a. "Outer ring located on the inner wall of the rotating hole 21a" means that the outer ring of bearing 25 is fixed to the inner side of the rotating hole 21a by an interference fit or snap-fit ​​structure. This can be achieved using heat fitting or press fitting processes, ensuring no relative movement between the outer ring of bearing 25 and the rotating hole 21a. "Inner ring fitted onto the inner rotor 22" means that the inner ring of bearing 25 is installed on the outer circumference of the inner rotor 22 by a keyway or tight fit. This can be achieved using a tapered sleeve or a lock nut, allowing the inner rotor 22 and the inner ring of bearing 25 to rotate synchronously.

[0038] Specifically, the inner wall of the rotating hole 21a is machined with mounting positions that match the size of the outer ring of the bearing 25. The outer ring of the bearing 25 is inserted into the inner wall of the rotating hole 21a through an interference fit, and the inner ring of the bearing 25 is fitted onto the outer surface of the inner rotor 22 through a tight fit. When the inner rotor 22 is connected to the input shaft 51, the inner and outer rings of the bearing 25 move synchronously with the inner rotor 22 and the rotating hole 21a, respectively. This reduces the frictional resistance when the inner rotor 22 rotates, avoids axial misalignment or vibration caused by friction, and ensures that the inner rotor 22 and the input shaft 51 remain coaxial during dynamic rotation.

[0039] By adding the bearing 25 structure, the rotational motion of the inner rotor 22 is restricted between the inner and outer rings of the bearing 25, the radial clearance is precisely controlled, and the dynamic rotational stability is significantly improved. This solves the problem of reduced coaxiality caused by friction between the inner rotor 22 and the rotating hole 21a during the grass cutting head test. The bearing 25 structure effectively absorbs rotational vibration and restricts radial displacement, so that the inner rotor 22 can still maintain precise alignment with the input shaft 51 when rotating at high speed or under changing load, thereby improving the reliability of test data and extending the service life of the device.

[0040] The industry's aging tests on lawnmowers, especially those involving the two core components—the rotating motor of the mowing head (which drives the blade cutting) and the lifting motor of the mowing head (which adjusts the cutting height)—still have the following limitations and shortcomings: Test separation and inefficiency: Existing aging benches usually cannot apply real and independent loads to rotary motors and lifting motors for aging at the same time. They can only be tested separately. Therefore, this sequential operation method leads to a multiplied increase in the test cycle and extremely low efficiency, which cannot meet the test efficiency requirements of large-scale production. The simulation of rotating loads is distorted and fails to reflect real-world operating conditions: Existing solutions often oversimplify the load simulation of rotating motors. They either simulate no-load operation or use unrealistic, simplified loads, failing to accurately reproduce the current, temperature rise, and vibration characteristics of the motor under actual operating conditions. Distortion of lifting load: The load simulation of the lifting motor ignores the linkage effect and isolates the interaction between the rotating load and the lifting load; Lack of integrated aging capability: Existing aging methods fail to test rotation and lifting as an organic whole system. Some systemic faults that only occur when dual motors work together and loads interact (such as bus communication errors, insufficient power supply, and failure of coordinated control) are difficult to detect in advance.

[0041] To address the above problems, this utility model also proposes a lawnmower aging device 2000, please refer to it. Figure 3 , Figure 4 , Figure 5 as well as Figure 6 The lawnmower aging equipment 2000 includes a frame 3, and a lifting aging module 4, a rotating aging module 5, and an automatic mowing head centering coaxial testing device 1000 mounted on the frame 3. The lifting aging module 4 is used to raise and lower the rotating aging module 5. The rotating aging module 5 includes an input shaft 51, which is connected to the inner rotor 22. The rotating aging module 5 is used to simulate the mowing load or accelerated aging load of the mowing head, and the lifting aging module 4 is used to simulate the damping during the raising and lowering of the mowing head. The specific structure of the automatic mowing head centering coaxial testing device 1000 is as described in the above embodiments. Since this lawnmower aging equipment 2000 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated here.

[0042] The frame 3 refers to the basic structure supporting the equipment, which can be implemented using a metal frame or welded steel structure, and is used to support the installation of the lifting aging module 4 and the rotating aging module 5. The lifting aging module 4 is an adjustable-height motion mechanism, which can be implemented using a combination of slide rail 41 and slider 421. It adjusts its height by the force exerted by the mowing head to simulate the damping changes during the lifting and lowering process of the mowing head. The rotating aging module 5 is a component that applies a rotational load, which can be implemented using a combination of hysteresis brake 52 and torque meter 53, used to simulate the frictional resistance experienced by the blades during mowing operations or the additional load in accelerated aging tests.

[0043] Specifically, when the mowing head is installed on the inner rotor 22, the lifting aging module 4 simulates the damping changes encountered during the lifting and lowering of the mowing head by moving the slider 421 up and down along the slide rail 41. The input shaft 51 of the rotating aging module 5 drives the inner rotor 22 to rotate through a transmission connection, while the hysteresis brake 52 applies an adjustable load to simulate the actual mowing resistance. The sliding friction between the slide rail 41 and the slider locking mechanism is adjusted by the screw 422 to change the damping intensity of the lifting and lowering action.

[0044] The integrated design of the lifting aging module 4 and the rotating aging module 5 can simultaneously simulate the vertical movement resistance and rotational load of the mower head, making the testing process closer to real-world conditions. The combination of the counterweight mechanism and the locking structure of the slider 421 can precisely control the damping parameters, improving the repeatability of test conditions; the coordinated control of the lifting and rotating modules can simultaneously simulate the multi-dimensional load state of the mower head, making the aging test results more accurately reflect product performance. The modular design simplifies the equipment operation process; testers only need to install the mower head to start the fully automatic testing program.

[0045] Please refer to Figure 4 , Figure 5 as well as Figure 6 In one embodiment of the present invention, the lifting aging module 4 includes a slide rail 41 disposed on the frame 3 and a slider locking mechanism slidably connected to the slide rail 41, and the rotating aging module 5 is disposed on the slider locking mechanism.

[0046] The slide rail 41 is a linear guide structure fixed to the frame 3, which can be implemented using a high-precision linear guide rail. It provides a low-friction linear movement path for the lifting motion, ensuring the stability of the lifting process. The slider locking mechanism is an adjustable device composed of a slider 421 and fasteners. It can be implemented using an aluminum alloy slider 421 and a stainless steel screw 422. By adjusting the screw depth of the screw 422, the contact pressure between the slider 421 and the slide rail 41 is changed, thereby controlling the sliding resistance. Specifically, the slider 421 of the slider locking mechanism is nested on the slide rail 41 to achieve a sliding fit. The rotating aging module 5 is fixed to the surface of the connecting plate 43 by bolts. The bottom of the connecting plate 43 is rigidly connected to the slider 421 in the slider locking mechanism. When it is necessary to simulate the lifting and lowering action of the mowing head, the slider 421 moves up and down along the slide rail 41.

[0047] The linear guide structure of slide rail 41 and slider 421 avoids axial offset caused by equipment sway during lifting and lowering, ensuring that the mowing head and the automatic centering coaxial test device 1000 of the mowing head always remain coaxial.

[0048] Please refer to Figure 6 In one embodiment of this utility model, the slider locking mechanism includes a slider 421 and a screw 422, and the lifting aging module 4 also includes a connecting plate 43; the rotating aging module 5 is disposed on the connecting plate 43, the slide rail 41 is slidably connected to the slider 421, and the screw 422 passes through the slider 421 and is screwed to the connecting plate 43; the slider locking mechanism is configured such that when the screw 422 is turned, the tightness of the sliding connection between the slider 421 and the slide rail 41 can be adjusted to simulate the damping magnitude when the mowing head is raised and lowered.

[0049] Among them, screw 422 refers to a threaded fastener, which can be a hexagonal head bolt or an internal hexagonal screw 422. The clamping force between slider 421 and slide rail 41 is controlled by the depth of thread insertion. Connecting plate 43 refers to the mounting base plate that supports the rotating aging module 5. It can be formed by welding or casting a rectangular steel plate, and the surface is provided with screw holes for fixing the rotating aging module 5.

[0050] Specifically, when simulating different damping conditions during the raising and lowering of the mower head, the operator can rotate screw 422 using a tool. As the screw 422 is screwed in to a different depth, the pressure exerted by its end on the connecting plate 43 changes, thereby altering the frictional force at the contact surface between the slider 421 and the slide rail 41. When the frictional force increases, the sliding resistance of the slider 421 on the slide rail 41 increases, simulating the high-damping state during the raising and lowering of the mower head; when the frictional force decreases, the slider 421 moves more smoothly, simulating the low-damping state. This adjustment process requires no disassembly of components; continuous control of the damping force can be achieved simply by rotating a single screw 422.

[0051] By combining screw 422 and slider 421, the damping adjustment is transformed into a simple screw tightening operation, which not only preserves the reliability of the mechanical structure but also realizes the stepless adjustment function. This effectively solves the problems of low simulation accuracy and poor adjustment efficiency of the lawn mower head lifting damping in aging tests. Operators can quickly adjust the damping parameters according to the test requirements to accurately simulate the lifting conditions under different lawn hardness or mechanical wear conditions, which significantly improves the working condition coverage and test data validity of the whole lawn mower aging test.

[0052] Please refer to Figure 3 , Figure 4 , Figure 5 as well as Figure 6 In one embodiment of this utility model, the lifting and aging module 4 further includes a counterweight mechanism, which includes a connecting bar 442, at least one counterweight block 441, and at least one fixed pulley 443. Each fixed pulley 443 is rotatably connected to the frame 3. One end of the connecting bar 442 is provided on the connecting plate 43, and the other end passes around each fixed pulley 443 and is connected to the topmost counterweight block 441. The counterweight mechanism is used to simulate the constant load when the mowing head is raised and lowered.

[0053] Among them, the counterweight 441 refers to the metal block used to provide gravitational balance, which can be made of cast iron or steel.

[0054] Specifically, the counterweight mechanism is connected to the connecting plate 43 via the connecting strip 442. When the lifting and aging module 4 drives the connecting plate 43 to move up and down, the gravity of the counterweight block 441 is transmitted to the connecting plate 43 through the fixed pulley 443, forming a constant load opposite to the lifting and lowering direction of the mowing head.

[0055] The technical solution of this embodiment can simulate the lifting and lowering load of the mowing head under different working conditions. The linear adjustment of the load is achieved through the modular combination of the counterweight 441, which effectively improves the coverage and efficiency of the aging test, while reducing the complexity of equipment maintenance.

[0056] Please refer to Figure 4 , Figure 5 as well as Figure 6 In one embodiment of the present invention, the counterweight mechanism includes at least one screw 444 and a plurality of counterweight blocks 441, each screw 444 passing through all the counterweight blocks 441 and cooperating with a nut to limit the position of each counterweight block 441.

[0057] Among them, screw 444 refers to a rod-shaped component with external threads, which can be formed by machining metal. Its outer diameter matches the threaded hole of counterweight 441. By rotating screw 444, counterweight 441 can be combined or separated. This feature allows multiple counterweights 441 to be stacked along the axis of screw 444, making it easy to adjust the total weight by increasing or decreasing the number of counterweights 441.

[0058] Specifically, the screw 444 is vertically mounted at the end of the connecting strip 442, and multiple counterweights 441 are sequentially inserted into the screw 444 and formed a stacked structure through threaded engagement. When the simulated load needs to be adjusted, the operator can rotate the screw 444 to move the counterweights 441 along its axial direction, thereby increasing or decreasing the number of counterweights 441. This structure allows for counterweight adjustment to be completed simply by operating the screw 444 when simulating raising and lowering the load of the lawnmower head, without disassembling the entire counterweight system.

[0059] In some specific embodiments, a rotating handle may be provided at the top of the screw 444 to provide an operating fulcrum, and a guide chamfer may be machined on the edge of the threaded hole of the counterweight 441 to assist in alignment. The connection between the screw 444 and the connecting strip 442 can be achieved by welding or flange fixing. For example, a sleeve with internal threads may be welded to the end of the connecting strip 442, and then the screw 444 may be screwed into the sleeve to achieve axial fixation.

[0060] The modular combination of counterweight 441 through the threaded meshing structure enables rapid and precise adjustment of the counterweight load. During the grass-cutting head lifting test, the operator can change the simulated load in real time without interrupting the test, effectively improving the efficiency of aging test. At the same time, the modular design of counterweight 441 reduces equipment maintenance costs. When a single counterweight 441 is damaged, it can be directly replaced without scrapping the entire counterweight system.

[0061] Please refer to Figure 1 , Figure 2 , Figure 4 , Figure 5 as well as Figure 6 In one embodiment of this utility model, the rotating aging module 5 further includes a hysteresis brake 52 and a torque meter 53 both mounted on the frame 3; the input shaft 51, the torque meter 53 and the hysteresis brake 52 are sequentially connected in a transmission manner; the hysteresis brake 52 is fastened to the lifting aging module 4 by screws; the hysteresis brake 52 is used to simulate the mowing load or accelerated aging load of the mowing head, and the torque meter 53 is used to monitor the rotational torque, power and speed of the mowing head.

[0062] Among them, the hysteresis brake 52 refers to a device that generates controllable resistance through electromagnetic force. Specifically, it can be implemented using a disc hysteresis brake 52 with adjustable current input. By changing the input current, the braking torque can be adjusted, thereby simulating mowing loads or accelerated aging loads under different working conditions. The torque meter 53 refers to a sensor used to measure the dynamic torque of rotating parts. Specifically, it can be implemented using a non-contact strain gauge torque sensor or a phase difference torque sensor. It collects the torque, speed, and power data of the input shaft 51 in real time and transmits the signals to an external control system.

[0063] Specifically, when the lifting aging module 4 drives the rotating aging module 5 to move up and down, the hysteresis brake 52 can synchronously adjust the load torque to simulate the resistance changes of the mower head when operating at different heights. The torque meter 53 is directly connected to the input shaft 51 to monitor the dynamic parameters of the mower head in real time during the rotating aging process. For example, when the hysteresis brake 52 applies a periodic load, the torque meter 53 can continuously record torque fluctuation data, providing a quantitative basis for evaluating the durability of the mower head. The hysteresis brake 52 and the torque meter 53 form a closed-loop control. For example, when the detected torque exceeds a preset threshold, the load can be reduced by adjusting the input current of the hysteresis brake 52 to avoid overload damage to the equipment.

[0064] By linking the hysteresis brake 52 with the lifting module, the load can be dynamically adjusted according to the height of the mowing head. At the same time, the torque meter 53 provides real-time feedback of rotation parameters, enabling multi-condition simulation tests to be completed without manual intervention, significantly improving the automation level of testing and the accuracy of data acquisition. It also realizes the dynamic adaptation of load and real-time monitoring of rotation parameters during the aging test of the mowing head, reducing the risk of human error in the testing process and providing more reliable data support for evaluating the overall performance of the lawnmower.

[0065] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A grass cutting head automatic centering coaxial testing device applied to a grass cutting whole machine aging equipment, characterized in that, The automatic centering and coaxial testing device for the mower head includes: A guide assembly, the guide assembly including a lower housing (11) having a guide groove (11a); and A connecting assembly includes an upper housing (21) and an inner rotor (22); the upper housing (21) is inserted into the guide groove (11a); the upper housing (21) has a rotating hole (21a), and the inner rotor (22) is rotatably connected to the rotating hole (21a); ​​the inner rotor (22) is configured to be drively connected to the input shaft (51) of the lawnmower aging device and is detachably connected to the mowing head; The guide groove (11a) gradually shrinks along the insertion direction of the upper housing (21); the shape of the outer wall of the upper housing (21) is adapted to the shape of the groove wall of the guide groove (11a) so that the inner rotor (22) is coaxial with the input shaft (51) when the upper housing (21) and the lower housing (11) are inserted.

2. The automatic grass head centering coaxial test fixture of claim 1, wherein, The connecting assembly also includes an iron ring (23) and a magnetic component (26). The magnetic component (26) is disposed on the bottom wall of the guide groove (11a). The iron ring (23) is disposed on one end of the upper housing (21) near the magnetic component (26) and is magnetically connected to the magnetic component (26).

3. The automatic grass trimmer head self-centering coaxial testing device of claim 1, wherein, The guiding assembly includes a lower magnetic coupling (12), and the connecting assembly includes an upper magnetic coupling (24). The upper magnetic coupling (24) and the lower magnetic coupling (12) are magnetically connected. The lower magnetic coupling (12) is disposed in the guide groove (11a) and is configured to be drivenly connected to the input shaft (51). The upper magnetic coupling (24) is drivenly connected to the inner rotor (22).

4. The automatic grass head centering coaxial test device of any one of claims 1 to 3, wherein, The connecting assembly also includes a bearing (25), the outer ring of which is disposed on the inner wall of the rotating hole (21a), and the inner ring of which is sleeved on the inner rotor (22).

5. A mower machine aging apparatus, characterized by, The lawnmower aging equipment includes a frame (3), a lifting aging module (4), a rotating aging module (5), and an automatic centering coaxial testing device for the mower head as described in any one of claims 1 to 4, all mounted on the frame (3). The lifting aging module (4) is used to lift the rotating aging module (5) up and down; The rotary aging module (5) includes the input shaft (51), which is connected to the inner rotor (22) in a transmission manner; the rotary aging module (5) is used to simulate the mowing load or accelerated aging load of the mowing head, and the lifting aging module (4) is used to simulate the damping when the mowing head is lifted.

6. The mower machine aging apparatus according to claim 5, wherein The lifting aging module (4) includes a slide rail (41) disposed on the frame (3) and a slider locking mechanism slidably connected to the slide rail (41), and the rotating aging module (5) is disposed on the slider locking mechanism.

7. The lawnmower aging equipment as described in claim 6, characterized in that, The slider locking mechanism includes a slider (421) and a screw (422), and the lifting aging module (4) also includes a connecting plate (43); The rotating aging module (5) is located on the connecting plate (43). The slide rail (41) is slidably connected to the slider (421). The screw (422) passes through the slider (421) and is screwed to the connecting plate (43). The slider locking mechanism is configured to adjust the tightness of the sliding connection between the slider (421) and the slide rail (41) when the screw (422) is turned, so as to simulate the damping magnitude when the mowing head is raised and lowered.

8. The mower machine aging apparatus according to claim 7, wherein The lifting and aging module (4) also includes a counterweight mechanism, which includes a connecting bar (442), at least one counterweight block (441), and at least one fixed pulley (443); Each of the fixed pulleys (443) is rotatably connected to the frame (3). One end of the connecting strip (442) is located on the connecting plate (43), and the other end passes around each of the fixed pulleys (443) and is connected to the top counterweight block (441). The counterweight mechanism is used to simulate the constant load when the mowing head is raised and lowered.

9. The mower machine aging apparatus according to claim 8, wherein The counterweight mechanism includes at least one screw (444) and a plurality of the counterweight blocks (441), each screw (444) passing through all the counterweight blocks (441) and engaging with a nut to limit the position of each of the counterweight blocks (441).

10. The mower machine aging apparatus according to any one of claims 5 to 9, wherein The rotary aging module (5) also includes a hysteresis brake (52) and a torque meter (53) both disposed on the frame (3); The input shaft (51), the torque meter (53), and the hysteresis brake (52) are sequentially connected in a transmission manner; the hysteresis brake (52) and the lifting aging module (4) are fastened together by screws. The hysteresis brake (52) is used to simulate the mowing load or accelerated aging load of the mowing head, and the torque meter (53) is used to monitor the rotational torque, power and speed of the mowing head.

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