A leaf sweeper and its crushing mechanism

Abstract

This invention discloses a leaf sweeper and its pulverizing mechanism, belonging to the field of garden machinery. The pulverizing mechanism includes: a pulverizing chamber, a pulverizing component, and a braking component; the pulverizing component includes a drive source, a rotating shaft disposed within the pulverizing chamber and driven by the drive source, and a moving blade assembly mounted on the rotating shaft; the braking component is capable of locking the rotating shaft and / or disconnecting the drive source from the rotating shaft and / or controlling the drive source to stop working. This invention uses "spatial integrity" as a safety triggering benchmark. By detecting a spatial integrity violation event through the triggering component, it directly drives the mechanical brake actuator, improving the safety level of the pulverizing mechanism and achieving zero-delay active protection: "stops upon opening the cover, brakes upon leaving the position, and releases upon resetting."

Description

Technical Field

[0001] This invention belongs to the field of garden machinery, and in particular to a leaf sweeper and its crushing mechanism. Background Technology

[0002] While leaf sweeping machines offer good sweeping results, the swept leaves are relatively fluffy and take up a large area, causing the leaf collection bin to fill up quickly. This necessitates frequent machine shutdowns and leaf removal, resulting in low overall leaf processing efficiency. Therefore, a crushing mechanism is installed in the collection bin or collection channel to solve the problems of fluffy leaves and clogging in existing leaf sweeping machines. This increases the collection bin capacity and overall working efficiency, achieving highly efficient leaf processing.

[0003] However, the existing leaf sweeper crushing mechanism lacks a reliable safety protection mechanism. When the protective cover is accidentally opened, key components are disassembled, or personnel accidentally enter the work area during equipment operation, the rotating blades cannot be stopped in time, which can easily lead to serious mechanical injury accidents. At the same time, traditional crushing mechanisms are mostly open or semi-closed structures, which pose risks of foreign object entrapment, dust spillage, and component loosening, making it difficult to meet the operational requirements of high safety, high integration, and intelligent protection. Summary of the Invention

[0004] In order to overcome the above-mentioned technical defects, the present invention provides a leaf sweeper and its crushing mechanism to solve the problems involved in the background art.

[0005] On one hand, the present invention provides a pulverizing mechanism, comprising: Crushing chamber; A crushing assembly, comprising a drive source, a rotating shaft disposed within the crushing chamber and pulverized by the drive source, and a moving blade assembly mounted on the rotating shaft; A braking assembly capable of locking the shaft and / or disconnecting the drive source from the shaft and / or controlling the drive source to stop working.

[0006] Preferably or optionally, the braking assembly includes a holding brake mechanism disposed on the rotating shaft, the holding brake mechanism automatically locking the rotating shaft when power is cut off.

[0007] Preferably or optionally, the braking assembly includes a first gear that is driven to the drive source, a second gear that is driven to the shaft and meshes with the first gear, and an electromagnetic clutch disposed between the first gear and the second gear. The electromagnetic clutch automatically disconnects the connection between the first gear and the second gear and restricts the relative rotation of the second gear when the power is off.

[0008] Preferably or optionally, the inner wall of the crushing chamber is also equipped with a fixed blade assembly that cooperates with the moving blade.

[0009] Preferably or optionally, the crushing chamber is provided with a feed inlet and a discharge outlet.

[0010] Preferably or optionally, the rotating shaft is also equipped with blower blades, which drive the airflow and crushed material to move from the feed inlet to the discharge outlet under the drive of the rotating shaft.

[0011] On the other hand, the present invention also provides a leaf sweeper, comprising: A collection chamber, the collection chamber including a housing and an openable and closable cover plate disposed on the housing; The cleaning mechanism includes a roller brush feeding mechanism located in front of the cover. A crushing mechanism is provided, which is located in the collection chamber or in the communication channel between the cleaning mechanism and the collection chamber, and the crushing mechanism has the structure of a crushing mechanism provided by the present invention.

[0012] Preferably or optionally, it further includes: A triggering component is provided, which is capable of monitoring the integrity status of the crushing chamber and / or whether the cover is opened, and the triggering component is signal-connected to the braking component; when the triggering component detects that the integrity of the crushing chamber is compromised and / or the cover is opened, it controls the braking component to perform braking.

[0013] Preferably or optionally, the triggering component includes a first triggering unit, the first triggering unit including a micro switch disposed between the cover and the cover plate, adapted to detect the opening and closing angle of the cover plate relative to the cover.

[0014] Preferably or optionally, the triggering component further includes a second triggering unit, which includes a displacement sensor located at the connection between the crushing chamber and the leaf sweeper, for detecting the displacement state of the crushing mechanism relative to the cover.

[0015] This invention relates to a leaf sweeper and its crushing mechanism, which, compared with the prior art, has the following advantages: 1. This invention uses "spatial integrity" as a safety trigger benchmark. By detecting spatial integrity violation events through trigger components, it directly drives the mechanical brake actuator to improve the safety level of the crushing mechanism and achieve zero-delay active protection of "stopping when the cover is opened, braking when the object is removed, and resolving when the object is reset".

[0016] 2. The crushing chamber of the present invention can effectively prevent safety accidents such as cuts and entanglement caused by misoperation, maintenance negligence or loose structure. At the same time, the crushing chamber can suppress dust emission and noise transmission, and improve the environmental protection and comfort of operation.

[0017] 3. The crushing component of the present invention adopts an integrated design to reduce external pipeline exposure and assembly errors, thereby enhancing the overall reliability and ease of maintenance.

[0018] 4. The brake triggering logic of this invention is based on physical space constraints rather than simple software judgment, and has the characteristics of strong anti-interference, extremely low failure probability, and compliance with mechanical safety standards (such as ISO 13857 and GB / T 15706). Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the leaf sweeper in this invention.

[0020] Figure 2 This is a schematic diagram of the crushing mechanism in this invention.

[0021] Figure 3 This is a schematic diagram of the crushing chamber in this invention.

[0022] Figure 4 This is a side view of the crushing mechanism in this invention.

[0023] Figure 5 This is a schematic diagram of the structure of the rotating shaft, the moving blade assembly, and the blower blade in this invention.

[0024] The attached figures are labeled as follows: 100, casing; 200, cover plate; 300, crushing mechanism; 400, collection bin; 500, cleaning mechanism; 1, crushing chamber; 11, feed inlet; 12, discharge outlet; 2, crushing assembly; 21, drive source; 22, transmission assembly; 23, rotating shaft; 24, moving blade assembly; 25, fixed blade assembly; 26, blowing blade; 3, braking assembly; 41, first trigger unit; 411, micro switch body; 412, actuation structure; 42, second trigger unit. Detailed Implementation

[0025] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid obscuring the invention.

[0026] See appendix Figures 1 to 5 This embodiment provides a crushing mechanism 300, which can be applied to a leaf sweeper. For those skilled in the art, this crushing mechanism 300 is not limited to leaf sweepers, but can also be applied to straw returning machines, small industrial crushers, and branch crushers, etc. The crushing mechanism 300 includes: a crushing chamber 1, a crushing component 2, and a braking component 3.

[0027] For ease of description, a leaf sweeper is used as an example in this embodiment. Please refer to the appendix. Figure 1 , 2 The leaf sweeper includes a collection bin 400, a sweeping mechanism 500, and a crushing mechanism 300. The collection bin 400 includes a cover 100 and an openable cover plate 200 disposed on the cover 100 (the cover 100 can be rigid (such as metal), semi-rigid (such as plastic), or flexible material (such as canvas or rainproof cloth)). When the leaf sweeper is performing leaf sweeping and crushing operations, the presence of the cover plate 200 can effectively prevent safety accidents caused by human error, maintenance negligence, or accidental impact. At the same time, the structure also reduces noise and dust emission. The sweeping mechanism 500 includes a roller brush feeding mechanism disposed in front of the cover 100. The crushing mechanism 300 is disposed inside the collection bin 400 or in the connecting channel between the sweeping mechanism 500 and the collection bin 400.

[0028] See appendix Figure 4 The crushing chamber 1 forms a safe working space. The crushing chamber 1 is provided with a feed inlet 11 and a discharge outlet 12. The feed inlet 11 is connected to the cleaning mechanism 500 of the leaf sweeper, and the discharge outlet 12 is connected to the collection bin 400.

[0029] See appendix Figure 3 The crushing assembly 2 includes a drive source 21, a rotating shaft 23 disposed within the crushing chamber 1 and pulverized by the drive source 21, and a moving blade assembly 24 mounted on the rotating shaft 23. The drive source 21 is a drive motor, which drives the rotating shaft 23 to rotate via a transmission assembly 22 (a gear set in this embodiment), thereby driving the blade assembly to rotate within the crushing chamber 1 to crush the leaves. To improve the crushing effect, a fixed blade assembly 25 is also provided on the inner wall of the crushing chamber 1 to cooperate with the moving blade. The fixed blade assembly 25 and the moving blade assembly 24 are arranged alternately, and the fixed blade assembly 25 cooperates with the rotating moving blade assembly 24 to complete the shearing and crushing.

[0030] See appendix Figure 5 The rotating shaft 23 is also equipped with a blower blade assembly, which includes multiple blower blades 26 fixed on the rotating shaft 23. Driven by the rotating shaft 23, the blower blades 26 drive the airflow and the pulverized material from the feed inlet 11 to the discharge outlet 12. This achieves integrated and coordinated operation of pulverization and pneumatically assisted discharge, significantly improving discharge smoothness and continuous operation time, and reducing the frequency of downtime for clearing blockages. Simultaneously, it eliminates the need for an additional drive motor or independent air source system, resulting in a compact structure, low energy consumption, and controllable cost, while simultaneously improving overall machine reliability and operating efficiency. It fundamentally solves the technical problem of lightweight fiber materials easily becoming stuck, entangled, and blocked in the later stages of pulverization.

[0031] The braking component 3 brakes the crushing mechanism 300. The braking component 3 can be activated actively or passively. Active activation involves manually sending a braking signal to the controller of the leaf sweeper / crushing mechanism 300 to control the braking component 3 to perform braking. Passive activation involves setting up a trigger component to monitor the integrity of the crushing chamber 1 and / or whether the cover plate 200 is open, and the trigger component is signal-connected to the braking component 3. When the trigger component detects that the integrity of the crushing chamber 1 is compromised and / or the cover plate 200 is opened, it controls the braking component 3 to perform braking.

[0032] The braking component 3 is described in three exemplary embodiments in this embodiment. In the first embodiment, the braking component 3 can control the drive source 21 to stop working, and the controller of the leaf sweeper / crushing mechanism 300 sends an emergency stop signal to the drive motor to control it to stop working or directly disconnects the power supply to the drive motor.

[0033] In the second embodiment, the braking assembly 3 includes a holding brake mechanism mounted on the rotating shaft 23. This holding brake mechanism automatically locks the rotating shaft 23 when power is off, thus braking the crushing assembly 2. Specifically, this mechanism is typically a normally closed electromagnetic brake, comprising an electromagnetic coil, an armature, friction pads, and a pressure spring. Under normal conditions, the electromagnetic coil is energized, generating a magnetic force that attracts the armature, overcoming the spring force to separate the friction pads from the brake disc fixed on the rotating shaft 23, allowing the rotating shaft 23 to rotate freely. When a trigger signal is generated, the power supply to the electromagnetic coil is immediately cut off, the spring force is rapidly released, and the friction pads are pushed to tightly lock the brake disc, thereby forcing the rotating shaft 23 to stop rotating in a very short time. This embodiment provides direct braking, fast response, and a power-off self-locking function.

[0034] In the third embodiment, the braking assembly 3 disconnects the drive source 21 from the rotating shaft 23, and an electromagnetic clutch is installed between the gear sets to interrupt the power transmission between the drive source 21 and the crushing assembly 2. Specifically, a first gear and a second gear mesh with each other on the transmission path between the output shaft of the drive motor and the rotating shaft 23. An electromagnetic clutch is installed between the first gear and the second gear. Under normal conditions, the power of the first gear is transmitted to the second gear, thereby driving the rotating shaft 23 to rotate. When a trigger signal is generated, the internal engagement is released, automatically disconnecting the connection between the first gear and the second gear. At the same time, the electromagnetic clutch preferably has a self-locking or braking function, which can lock the free rotation of the second gear and the rotating shaft 23 connected to it. This embodiment achieves braking by disconnecting the power transmission and locking the driven end.

[0035] The triggering assembly includes a first triggering unit 41 for detecting the opening of the cover plate 200 and a second triggering unit 42 for monitoring the overall displacement of the crushing mechanism 300.

[0036] The first triggering unit 41 includes a microswitch disposed between the housing 100 and the cover plate 200, adapted to detect the opening angle of the cover plate 200 relative to the housing 100. Specifically, the microswitch includes a microswitch body 411 mounted on the housing 100 and an actuating structure 412 disposed at the free end of the cover plate 200 (the end away from the hinge end) and cooperating with the microswitch body 411. In this embodiment, the actuating structure 412 is a protrusion disposed on the cover plate 200. When the cover plate 200 is fully closed, the actuating structure 412 presses down on the contact of the microswitch body 411, at which time the switch is in a "safe closed" state. When the cover plate 200 is opened, when the opening of the cover plate 200 exceeds 1 degree, the actuating structure 412 releases the pressure on the contact, the internal mechanism of the microswitch actuates instantaneously, changes its electrical contact state, and outputs a trigger signal.

[0037] The second triggering unit 42 includes a displacement sensor located at the connection between the crushing chamber 1 and the leaf sweeper, used to detect the displacement state of the crushing mechanism 300 relative to the cover 100, i.e., to monitor whether the entire crushing mechanism 300 has abnormally disengaged from the leaf sweeper cover 100. Specifically, this unit includes a displacement sensor located at the connection between the cover 100 of the crushing chamber 1 and the leaf sweeper cover 100, such as a high-precision mechanical limit switch or an inductive proximity switch. In the normal operating position, the cover 100 is firmly connected to the cover 100 via a positioning pin and fasteners, which press against the probe or trigger plate of the displacement sensor, keeping it in the "in position" state. If the crushing mechanism 300 is displaced relative to the cover 100 due to impact, vibration, or loosening of the connection, for example, if the displacement exceeds 1 cm, a trigger signal will be output.

[0038] The signal output terminals of the first trigger unit 41 and the second trigger unit 42 are connected in parallel via an "OR" logic to the safety control circuit to detect the integrity of the crushing chamber 1, thereby controlling the braking assembly 3 to perform braking. This means that if either the first trigger unit 41 or the second trigger unit 42 detects an abnormality, it will immediately trigger the braking response of the braking assembly 3. When the integrity of the crushing chamber 1 is compromised, the trigger assembly controls the braking assembly 3 to perform braking.

[0039] Similarly, when the crushing mechanism 300 performs a reset operation, two conditions must be met simultaneously: the cover plate 200 must be fully closed and all covers 100 must return to their preset installation positions. At this point, the brake is automatically released, and the system can be restarted. The entire mechanism achieves hard-wired interlocking, zero-delay response, and self-recovering safety logic.

[0040] In summary, this embodiment uses "spatial integrity" as the safety trigger benchmark, constructs a state perception and execution closed loop based on a physically enclosed boundary, and rigidly confines all moving and key stationary components of the crushing mechanism 300 within the same enclosed cavity. It uniformly maps various abnormal states such as the opening and closing of the cover plate 200, component displacement, and cavity separation as spatial integrity violation events, and directly and without delay drives the mechanical braking actuator. This achieves hardware-level spatial interlocking, multi-point mechanical redundancy triggering, non-electrically dependent emergency braking, and dual-element strong coupling verification of reset conditions, forming a safe, highly robust, calibration-free, and easily engineering-implemented new intelligent mechanical safety method.

[0041] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

Claims

1. A crushing mechanism (300), characterized in that, include: Crushing chamber (1); The crushing assembly (2) includes a drive source (21), a rotating shaft (23) disposed in the crushing chamber (1) and connected to the drive source (21) for transmission, and a moving blade assembly (24) mounted on the rotating shaft (23). The braking assembly (3) is capable of locking the shaft (23) and / or disconnecting the drive source (21) from the shaft (23) and / or controlling the drive source (21) to stop working.

2. The crushing mechanism (300) according to claim 1, characterized in that, The braking assembly (3) includes a holding brake mechanism disposed on the rotating shaft (23), which automatically locks the rotating shaft (23) when power is cut off.

3. The crushing mechanism (300) according to claim 1, characterized in that, The braking assembly (3) includes a first gear that is driven to the drive source (21), a second gear that is driven to the shaft (23) and meshes with the first gear, and an electromagnetic clutch disposed between the first gear and the second gear. When the power is off, the electromagnetic clutch automatically disconnects the connection between the first gear and the second gear and restricts the relative rotation of the second gear.

4. The crushing mechanism (300) according to claim 1, characterized in that, The inner wall of the crushing chamber (1) is also equipped with a fixed blade assembly (25) that cooperates with the moving blade assembly (24).

5. The crushing mechanism (300) according to claim 1, characterized in that, The crushing chamber (1) is provided with a feed inlet (11) and a discharge outlet (12).

6. The crushing mechanism (300) according to claim 5, characterized in that, The rotating shaft (23) is also equipped with a blower blade (26), which drives the airflow and crushed material from the feed inlet (11) to the discharge outlet (12) under the drive of the rotating shaft (23).

7. A leaf sweeper, characterized in that, include Collection chamber (400), the collection chamber (400) includes a cover (100) and an openable cover plate (200) disposed on the cover (100). The cleaning mechanism (500) includes a roller brush feeding mechanism located in front of the cover (100); A crushing mechanism (300) is disposed in a collection chamber (400) or in a communication channel between the cleaning mechanism (500) and the collection chamber (400), and the crushing mechanism (300) has the structure of the crushing mechanism (300) according to any one of claims 1 to 6.

8. The leaf sweeper according to claim 7, characterized in that, The leaf sweeper also includes: The triggering component is capable of monitoring the integrity status of the crushing chamber (1) and / or whether the cover plate (200) is opened, and the triggering component is signal-connected to the braking component (3); when the triggering component detects that the integrity of the crushing chamber (1) is damaged and / or the cover plate (200) is opened, it controls the braking component (3) to perform braking.

9. The leaf sweeper according to claim 8, characterized in that, The triggering component includes a first triggering unit (41), which includes a micro switch disposed between the cover (100) and the cover plate (200) and is adapted to detect the opening and closing angle of the cover plate (200) relative to the cover (100).

10. The leaf sweeper according to claim 8, characterized in that, The triggering component further includes a second triggering unit (42), which includes a displacement sensor located at the connection between the crushing chamber (1) and the leaf sweeper, for detecting the displacement state of the crushing mechanism (300) relative to the cover (100).

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