Electric pruning shears

Abstract

The application discloses an electric pruning shears, comprising: a casing; a cutter mechanism, comprising a cutter fixed seat and a cutter assembly, the cutter fixed seat is installed on the casing, and the cutter fixed seat is provided with a connecting hole; a locking mechanism, comprising a locking screw and a locking nut, the locking screw is arranged on the cutter assembly and the connecting hole, and is in threaded connection with the locking nut. A motor is installed in the casing; a controller is installed in the casing and connected with the motor; a prompt unit is installed on the casing and connected with the controller; a transmission mechanism is installed in the casing, and the transmission mechanism is in transmission connection between the motor and the cutter assembly; a pressure sensor is clamped between the locking nut and the locking screw along the axial direction of the locking screw. The electric pruning shears can reduce the problems of skin clamping and machine heating caused by improper tightening of the locking nut.

Description

Technical Field

[0001] This application belongs to the field of garden electronic equipment technology, specifically relating to an electric pruning shears. Background Technology

[0002] Electric pruning shears, also known as electric pruning shears or electric pruning machines, typically have blades that are tightened onto a fixed base using a locking nut. The tightness of the nut (i.e., the required torque) affects the performance of the electric pruning shears. Too tight a nut increases blade friction, resulting in higher current and heat generation; too loose a nut can cause bark to get caught and the blade to loosen more easily. Manufacturers set the torque (tightness) of the locking nut during assembly to ensure these problems do not occur.

[0003] However, after long-term use, users will replace the blades of electric pruning shears themselves to maintain their sharpness. After replacing the blades, users need to tighten the locking nut themselves. At this time, it is impossible to ensure that the tightening degree of the locking nut meets the requirements, which may cause problems such as bark entrapment and machine overheating.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this application and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0005] The purpose of this application is to provide an electric pruning shear that can reduce problems such as bark pinching and machine overheating caused by improper tightening of the locking nut.

[0006] To achieve the above objectives, a specific embodiment of this application provides the following technical solution: an electric pruning shear, comprising:

[0007] chassis;

[0008] The tool mechanism includes a tool holder and a tool assembly. The tool holder is mounted on the housing and has a connection hole.

[0009] The locking mechanism includes a locking screw and a locking nut. The locking screw passes through the tool assembly and the connecting hole and is threadedly connected to the locking nut to lock the tool assembly onto the tool holder.

[0010] The motor is installed inside the housing;

[0011] The controller is installed inside the housing and connected to the motor;

[0012] The prompting unit is mounted on the housing and is connected to the controller via a signal.

[0013] A transmission mechanism is installed inside the housing and is drively connected between the motor and the tool assembly;

[0014] A pressure sensor is clamped between the locking nut and the locking screw along the axial direction of the locking screw. The pressure sensor is signal-connected to the controller to transmit a pressure signal to the controller. The controller responds to the pressure signal and outputs a prompt signal to the prompting unit.

[0015] In one or more embodiments of this application, the surface of the pressure sensor facing the locking nut is an annular surface, and the annular surface is coaxially arranged with the connecting hole.

[0016] In one or more embodiments of this application, the electric pruning shears include a plurality of pressure sensors arranged around a connection hole.

[0017] In one or more embodiments of this application, a limiting groove is provided on the surface of the tool holder facing the locking nut, and at least part of the pressure sensor is disposed in the limiting groove.

[0018] In one or more embodiments of this application, an electrical connection wire is connected between the pressure sensor and the controller, and the tool holder is also provided with a cable tray, which is connected to the limiting groove, and a portion of the electrical connection wire is disposed in the cable tray.

[0019] In one or more embodiments of this application, the electric pruning shears further includes an anti-loosening mechanism, which includes a limiting member that is detachably mounted on the cutter holder or the housing, and the limiting member is engaged with a locking nut.

[0020] In one or more embodiments of this application, the limiting member includes a first retaining portion, and the locking nut includes a nut body and a second retaining portion disposed on the outer periphery of the nut body, wherein the first retaining portion and the second retaining portion retain each other; and / or,

[0021] The anti-loosening mechanism also includes a limiting screw, and the limiting component can be detachably installed on the tool holder or the machine housing via the limiting screw.

[0022] In one or more embodiments of this application, the second holding portion is a toothed structure, and the first holding portion engages with the toothed structure.

[0023] In one or more embodiments of this application, a portion of the shaft of the locking screw is irregularly shaped, and the irregularly shaped portion locks into the connecting hole; and / or,

[0024] The prompting unit is a buzzer or a display; and / or,

[0025] The controller is configured to send a prompt signal to the prompting unit when the pressure signal exceeds a threshold range.

[0026] In one or more embodiments of this application, the alert signal is different when the pressure signal is below a threshold range than when the pressure signal is above a threshold range.

[0027] Compared with the prior art, the electric pruning shears of this application, by clamping a pressure sensor between the locking nut and the blade holder, generate a pressure signal (i.e., the value of the clamping force exerted by the locking nut on the pressure sensor) when the user tightens the locking nut. The pressure sensor transmits the received pressure signal to the controller, which responds to the pressure signal and outputs a prompt signal to the prompting unit. The prompting unit provides feedback based on the prompt signal, and the user determines whether the locking nut is tightened properly according to the feedback, thereby ensuring that the tightening degree of the locking nut is qualified. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application 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 recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of an electric pruning shears in one embodiment of this application;

[0030] Figure 2 This is a schematic diagram of the internal structure of the electric pruning shears in one embodiment of this application;

[0031] Figure 3 This is an exploded view of a portion of the structure of the electric pruning shears in one embodiment of this application;

[0032] Figure 4 This is an exploded view of a portion of the structure of an electric pruning shears in one embodiment of this application.

[0033] Explanation of key figure labels:

[0034] 1. Housing; 2. Tool mechanism; 21. Tool holder; 211. Connecting hole; 212. Limiting groove; 213. Cable tray; 22. Tool assembly; 221. Fixed blade; 2211. Positioning hole; 222. Moving blade; 2221. Limiting hole; 223. Swivel tooth; 2231. Main body; 2232. Toothed part; 2233. Protrusion; 22331. Slot; 224. Fixing component; 3. Locking mechanism; 31. Locking screw; 311. Shaft; 312. Nut; 32. Locking nut; 321. Nut body; 322. Second holding part; 4. Motor; 5. Controller; 6. Transmission mechanism; 7. Pressure sensor; 8. Anti-loosening mechanism; 81. Limiting component; 82. Limiting screw; 811. First holding part; 9. Electrical connection wire. Detailed Implementation

[0035] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of this application.

[0036] During the assembly process of electric pruning shears at the factory, specialized equipment is typically used to test the torque value of the locking nut, ensuring it is within a certain range. This guarantees the tightness of the locking nut and prevents issues such as bark trapping and machine overheating. For example, for a specific model of electric pruning shears, a locking nut torque value (tightening torque) of 2.5~3 N.m provides the correct tightness, avoiding problems such as bark trapping and machine overheating.

[0037] like Figures 1 to 4As shown, an electric pruning shear in one embodiment of this application includes a housing 1, a blade mechanism 2, a locking mechanism 3, a motor 4, a controller 5, a prompting unit, a transmission mechanism 6, and a pressure sensor 7. The tool mechanism 2 includes a tool holder 21 and a tool assembly 22. The tool holder 21 is mounted on the housing 1 and has a connecting hole 211. The locking mechanism 3 includes a locking screw 31 and a locking nut 32. The locking screw 31 passes through the tool assembly 22 and the connecting hole 211 and is threadedly connected to the locking nut 32 to lock the tool assembly 22 onto the tool holder 21. The motor 4 is mounted inside the housing 1. The controller 5 is mounted inside the housing 1 and connected to the motor 4. The prompting unit is mounted on the housing 1 and is signal-connected to the controller 5. The transmission mechanism 6 is mounted inside the housing 1 and is drively connected between the motor 4 and the tool assembly 22. The pressure sensor 7 is clamped between the locking nut 32 and the locking screw 31 along the axial direction of the locking screw 31. The pressure sensor 7 is signal-connected to the controller 5 to transmit a pressure signal to the controller 5. The controller 5 responds to the pressure signal and outputs a prompting signal to the prompting unit.

[0038] It is understood that the electric pruning shears of this application incorporate a pressure sensor 7 between the locking nut 32 and the blade holder 21. The pressure sensor 7 can sense the clamping force generated by the locking mechanism 3 (also referred to as the pressure signal sensed by the pressure sensor 7). The electric pruning shears are manufactured with the torque value of the locking nut 32 and the clamping force value sensed by the pressure sensor 7 corresponding to each other. Therefore, the range of clamping force values ​​that the locking mechanism 3 should generate (i.e., the preset range of clamping force values, also referred to as the threshold range of clamping force or pressing force) is known at the time of manufacture and can be recorded in the controller 5. When the user tightens the locking nut 32 after replacing the blade, the pressure sensor 7 senses the real-time clamping force value and transmits it to the controller 5 in the form of a pressure signal. The controller 5 responds to the pressure signal and outputs a prompt signal to the prompt unit. The prompt unit provides feedback based on the prompt signal. The user can determine whether the tightening degree of the locking nut 32 has reached the required level based on the feedback from the prompt unit, thereby avoiding problems such as bark clamping and machine overheating. Signal connection can include wireless and wired connections.

[0039] The electric pruning shears of this embodiment may also include a battery pack installed on the housing 1. The battery pack is connected to the controller 5 and the motor 4, and serves to supply power to the controller 5 and the motor 4.

[0040] like Figure 1 As shown, the housing 1 may include two housings connected together, which can be connected by snap-fit, bolts, or other means. The tool holder 21 is mounted on the top of the housing 1 and partially protrudes from the housing 1. The tool holder 21 can be attached to the housing 1 by screws or snap-fit.

[0041] Specifically, controller 5 is configured to send a warning signal to the warning unit when the pressure signal exceeds a threshold range. Furthermore, the warning signal differs when the pressure signal is below the threshold range from when it is above the threshold range. Even further, the warning signal differs when the pressure signal is below the threshold range, when the pressure signal is within the threshold range, and when it is above the threshold range.

[0042] Preferably, the prompting unit (not shown in the figure) is a buzzer or a display. When the prompting unit is a display, the display can show both the real-time clamping force value and the preset clamping force value range based on the received prompting signal (i.e., the feedback from the prompting unit), for the user to see. The user can determine whether the locking nut 32 is properly tightened by checking whether the real-time clamping force value falls within the preset clamping force value range. The display is mounted on the housing 1 and the screen is visible to the user.

[0043] When the prompting unit is a buzzer, the controller 5 can compare the real-time clamping force value with the preset clamping force value range, thereby controlling the buzzer to emit different sound information. For example, if the real-time clamping force value is less than the preset clamping force value range, the buzzer can output one or several syllables in a specific sequence; if the real-time clamping force value falls within the preset clamping force value range, the buzzer can output another one or several syllables in a different sequence; if the real-time clamping force value is greater than the preset clamping force value range, the buzzer can output one or more more syllables in a specific sequence. The different syllables output by the buzzer indicate whether the locking nut 32 is tightened properly. To avoid the buzzer constantly outputting sound, the controller 5 can be equipped with a component for turning the buzzer on and off (not shown in the figure), allowing the user to turn the buzzer on and off via the controller 5.

[0044] The display and buzzer in this application are existing structures on the market, and the controller 5 is a common controller on the market.

[0045] like Figure 3 and Figure 4 As shown, a limiting groove 212 is provided on the surface of the tool holder 21 facing the locking nut 32. At least part of the pressure sensor 7 is located in the limiting groove 212. The limiting groove 212 can accommodate the pressure sensor 7 and limit and position the pressure sensor 7, which facilitates the installation of the pressure sensor 7 and ensures that the pressure sensor 7 can be accurately clamped between the tool holder 21 and the locking nut 32.

[0046] Furthermore, an electrical connection wire 9 is connected between the pressure sensor 7 and the controller 5. The tool holder 21 is also provided with a cable tray 213, which is connected to the limiting groove 212. Part of the electrical connection wire 9 is located in the cable tray 213. This arrangement facilitates the reception of the electrical connection wire 9. The electrical connection wire 9 can transmit the pressure sensor 7 to the controller 5 and supply power to the pressure sensor 7.

[0047] like Figure 3 and Figure 4 As shown, in this embodiment, the surface of the pressure sensor 7 facing the locking nut 32 is an annular surface, and the annular surface is coaxially arranged with the connecting hole 211. That is, the pressure sensor 7 is annular and coaxially arranged with the nut. This arrangement allows the pressure sensor 7 to fully contact the locking nut 32, ensuring that the pressure sensor 7 fully senses the force applied by the locking nut 32 and ensuring the accuracy of the sensing.

[0048] In other embodiments, the electric pruning shears include a plurality of pressure sensors 7 arranged around the connection hole 211. This arrangement can achieve a similar effect as described above.

[0049] like Figures 1 to 4 As shown, the locking screw 31 includes a shaft 311 and a nut 312 connected together. The end of the shaft 311 away from the nut 312 passes through the tool assembly 22 and the tool holder 21 and is threadedly connected to the locking nut 32. The tool assembly 22 and the tool holder 21 are clamped between the locking nut 32 and the nut 312, thereby locking the tool assembly 22 onto the tool holder 21.

[0050] It is understandable that the pressure sensor 7 is clamped between the locking nut 32 and the locking screw 31 along the axial direction of the locking screw 31, that is, the pressure sensor 7 is clamped between the locking nut 32 and the locking nut 312.

[0051] Preferably, a portion of the shaft body 311 is irregularly shaped, and the cross-section of the connecting hole 211 is also similarly irregularly shaped. This arrangement allows the two irregularly shaped portions to abut or engage with each other when the shaft body 311 is inserted into the connecting hole 211, thereby restricting the rotation of the locking screw 31 and the connecting hole 211. For example, in this embodiment, a portion of the shaft body 311 is flat, and a portion of the inner wall of the connecting hole 211 is also flat.

[0052] like Figures 1 to 4As shown, the electric pruning shears also include an anti-loosening mechanism 8, which includes a limiting member 81 and a limiting screw 82. The limiting member 81 is detachably mounted on the tool holder 21 and is engaged with the locking nut 32. The limiting member 81 is detachably mounted on the tool holder 21 by the screw. It is understood that when the locking nut 32 is tightened, the limiting member 81 can engage with the locking nut 32, thereby preventing the locking nut 32 from loosening. The limiting screw 82 is threadedly connected to the tool holder 21. In other embodiments, the limiting screw 82 can also be connected to the housing 1, thereby achieving a detachable connection between the limiting member 81 and the housing 1.

[0053] Specifically, the limiting member 81 includes a first holding part 811, and the locking nut 32 includes a nut body 321 and a second holding part 322 disposed on the outer periphery of the nut body 321. The first holding part 811 and the second holding part 322 hold each other.

[0054] Preferably, the second holding part 322 is a toothed structure, and the first holding part 811 engages with the toothed structure. In this case, the first holding part 811 can also be a toothed structure or a protruding structure, so as to achieve mutual holding between the first holding part 811 and the second holding part 322.

[0055] In other embodiments, the first retaining part 811 and the second retaining part 322 can be other common structures, as long as they can retain each other. For example, the second retaining part 322 is hole-shaped, the first retaining part 811 is shaft-shaped, and the first retaining part 811 is inserted into the second retaining part 322, so that the first retaining part 811 and the second retaining part 322 retain each other.

[0056] like Figure 4 As shown, the tool assembly 22 includes a fixed blade 221, a movable blade 222, and a swivel tooth 223. The movable blade 222 is disposed between the fixed blade 221 and the swivel tooth 223. The swivel tooth 223 is connected to the movable blade 222. The swivel tooth 223 includes a connecting main body 2231 and a toothed part 2232. In this embodiment, the transmission mechanism 6 may include a gear set rotatably mounted in the housing 1. The output shaft of the motor 4 and the toothed part 2232 are respectively meshed with the gear set to realize the function of the motor 4 driving the swivel tooth 223 and the movable blade 222 to rotate.

[0057] In this embodiment, the fixed blade 221, the movable blade 222, and the oscillating tooth 223 all have holes through which the locking screw 31 passes. The oscillating tooth 223 also includes a protrusion 2233 protruding from the main body 2231. The movable blade 222 has a limiting hole 2221. The protrusion 2233 is inserted into the limiting hole 2221, thereby realizing the synchronous rotation of the movable blade 222 and the oscillating tooth 223.

[0058] Furthermore, the tool assembly 22 also includes a fixing member 224. The protrusion 2233 is provided with a slot 22331. After the protrusion 2233 passes through the limiting hole 2221 of the moving blade 222, the slot 22331 engages with the fixing member 224, that is, the moving blade 222 is clamped between the main body 2231 of the fixing member 224, thereby preventing the limiting hole 2221 from disengaging from the protrusion 2233.

[0059] Furthermore, the fixed blade 221 is provided with a positioning hole 2211, and a portion of the limiting screw 82 passes through the positioning hole 2211, thereby limiting the rotation of the fixed blade 221.

[0060] It will be apparent to those skilled in the art that this application is not limited to the details of the exemplary embodiments described above, and that this application can be implemented in other specific forms without departing from the spirit or essential characteristics of this application. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this application is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this application. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0061] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An electric pruning shear, characterized in that, include: Casing (1); The tool mechanism (2) includes a tool holder (21) and a tool assembly (22). The tool holder (21) is mounted on the housing (1) and has a connection hole (211). The locking mechanism (3) includes a locking screw (31) and a locking nut (32). The locking screw (31) passes through the tool assembly (22) and the connecting hole (211) and is threadedly connected to the locking nut (32). The motor (4) is installed inside the housing (1); The controller (5) is installed inside the housing (1) and connected to the motor (4); The prompting unit is installed on the housing (1) and is signal-connected to the controller (5); The transmission mechanism (6) is installed inside the housing (1) and is connected to the motor (4) and the tool assembly (22). A pressure sensor (7) is clamped between the locking nut (32) and the locking screw (31) along the axial direction of the locking screw (31). The pressure sensor (7) is signal-connected to the controller (5) to transmit a pressure signal to the controller (5). The controller responds to the pressure signal and outputs a prompt signal to the prompting unit.

2. The electric pruning shears according to claim 1, characterized in that, The pressure sensor (7) facing the locking nut (32) is an annular surface, and the annular surface is coaxially arranged with the connecting hole (211).

3. The electric pruning shears according to claim 1, characterized in that, The electric pruning shears include a plurality of pressure sensors (7), which are arranged around the connection hole (211).

4. The electric pruning shears according to claim 1, characterized in that, The tool holder (21) has a limiting groove (212) on the surface facing the locking nut (32), and at least part of the pressure sensor (7) is located in the limiting groove (212).

5. The electric pruning shears according to claim 4, characterized in that, An electrical connection line (9) is connected between the pressure sensor (7) and the controller (5). The tool holder (21) is also provided with a cable tray (213). The cable tray (213) is connected to the limiting groove (212). Part of the electrical connection line (9) is located in the cable tray (213).

6. The electric pruning shears according to claim 1, characterized in that, The electric pruning shears also include an anti-loosening mechanism (8), which includes a limiting member (81). The limiting member (81) can be detachably installed on the cutter fixing seat (21) or the machine housing (1). The limiting member (81) and the locking nut (32) are mutually locked.

7. The electric pruning shears according to claim 6, characterized in that, The limiting member (81) includes a first retaining part (811), and the locking nut (32) includes a nut body (321) and a second retaining part (322) disposed on the outer periphery of the nut body (321). The first retaining part (811) and the second retaining part (322) retain each other; and / or, The anti-loosening mechanism (8) also includes a limiting screw (82), and the limiting member (81) is detachably installed on the tool holder (21) or the machine housing (1) by means of the limiting screw (82).

8. The electric pruning shears according to claim 7, characterized in that, The second holding part (322) is a toothed structure, and the first holding part (811) engages with the toothed structure.

9. The electric pruning shears according to claim 1, characterized in that, The shaft (311) of the locking screw (31) has a portion that is irregularly shaped, and the irregularly shaped portion locks into the connecting hole (211); and / or, The prompting unit is a buzzer or a display; and / or, The controller (5) is configured to send a prompt signal to the prompting unit when the pressure signal exceeds the threshold range.

10. The electric pruning shears according to claim 1, characterized in that, The alert signal is different when the pressure signal is below the threshold range and when the pressure signal is above the threshold range.

Images