Pruning shears

Abstract

A pair of pruning shears comprises a motor, a gear box (1) and a blade (2), lubricating grease is arranged in the gear box (1), the pruning shears further comprise a heat conduction plate (3), a temperature sensor (4) and an alarm unit (5), the gear box (1) is provided with the heat conduction plate (3), the temperature sensor (4) is arranged on the heat conduction plate (3), the alarm unit (5) is electrically connected with the temperature sensor (4), and the alarm unit (5) sends out a lubrication lacking alarm according to the temperature detected by the temperature sensor (4); the pruning shears are favorable for reliably and accurately judging whether the pruning shears need to be lubricated, and are simple in structure and convenient to debug.

Description

Technical Field

[0001] This invention relates to the field of pruning machine technology, specifically to a pruning shear. Background Technology

[0002] In horticulture, electric pruning shears are a common tool for pruning. These pruning shears generally include a motor, a gearbox, and blades. The gearbox contains lubricating grease. In the prior art, some methods indirectly determine whether there is lubrication or blade wear by monitoring the motor current or motor temperature (which is essentially still the operating current) or the control board temperature (which is essentially still the operating current). For example, a backpack power supply device and backpack tool system disclosed in publication number WO2022262681A1. Such judgment methods are not necessarily reliable or accurate.

[0003] Therefore, this application proposes a pruning shear that facilitates reliable and accurate determination of whether lubrication is needed, while also being simple in structure and easy to adjust. Summary of the Invention

[0004] The technical problem to be solved by this invention is to provide a pruning shear that is conducive to reducing the height, reliable and accurate in determining whether lubrication is needed, and has a simple structure and is easy to adjust.

[0005] The technical solution of the present invention is: a pruning shear, including a motor, a gearbox and blades, the gearbox is provided with lubricating grease, and also includes a heat-conducting plate, a temperature sensor and an alarm unit. The gearbox is equipped with the heat-conducting plate, the heat-conducting plate is equipped with the temperature sensor, and the alarm unit is electrically connected to the temperature sensor. The alarm unit issues a lubrication shortage alarm based on the temperature detected by the temperature sensor.

[0006] In some embodiments, the heat-conducting plate is connected to the gear shaft of the gearbox for heat conduction.

[0007] In some embodiments, the heat-conducting plate also serves as a support plate for the gear shaft.

[0008] In some embodiments, a heat-conducting plate is disposed on one side of the gearbox, and the heat-conducting plate has a shaft hole. One end of the gear shaft is sleeved in the shaft hole, which is used to support the gear shaft.

[0009] In some embodiments, the shaft hole also allows the gear shaft to extend to a temperature sensor and be thermally connected.

[0010] In some embodiments, the heat-conducting plate is configured as one end of the gear shaft, which extends to and thermally connects to the temperature sensor.

[0011] In some embodiments, the temperature sensor is a temperature control switch, which activates the alarm unit to trigger an alarm when the temperature reaches a certain temperature.

[0012] In some embodiments, the alarm unit adopts an audible and visual alarm structure.

[0013] In some embodiments, the gearbox includes a cover plate with a shaft hole along the length of the gearbox. The cover plate also has a circuit board that overlaps with the shaft hole. A temperature sensor and an alarm unit are sequentially arranged on the circuit board along the length of the gearbox. When the cover plate is installed on the gearbox, the gear shaft of the gearbox is inserted into the shaft hole. The back of the temperature sensor is thermally connected to the inserted end of the gear shaft and / or thermally connected through the support plate of the gear shaft.

[0014] In some embodiments, when a support plate is provided, the support plate is provided on the cover plate. The support plate has a shaft hole along the length direction of the gearbox. The circuit board is stacked and fitted with the support plate. When the cover plate is installed on the gearbox, the gear shaft of the gearbox is inserted and fitted in the shaft hole. The back of the temperature sensor is thermally connected to the inserted end of the gear shaft and / or thermally connected through the support plate of the gear shaft.

[0015] With the above structure, the present invention has the following advantages: In this disclosure, the lubricant shortage is determined by detecting the temperature of the gearbox. When the lubricant is insufficient, the temperature rises rapidly due to dry friction in the gearbox, which triggers the alarm unit through the temperature sensor. The structure is simple and reliable, which is conducive to reliable and accurate determination of whether lubrication is needed. At the same time, by selecting different trigger temperatures, the debugging is convenient, thus providing a structural basis for obtaining the optimal alarm temperature, that is, providing a technical means.

[0016] In addition, this disclosure specifically proposes a thermally conductive connection between the back of the temperature sensor and the insertion end of the gear shaft and / or a thermally conductive connection through the support plate of the gear shaft. This not only makes the structure very compact, but also avoids the complex structure of the heat-conducting plate. Furthermore, by specifically selecting the temperature change of the gear shaft as the basis for judgment, it is possible to better determine whether there is a lack of oil, making it more stable and reliable, and effectively avoiding wear-related failures. Attached image description: Figure 1 This is a three-dimensional schematic diagram of the main unit of a pruning shears disclosed herein.

[0017] Figure 2 This is a 3D schematic diagram after the circuit board has been removed.

[0018] Figure 3 This is a three-dimensional diagram after the cover plate has been removed.

[0019] Figure 4 This is a three-dimensional schematic diagram of a cover plate from a frontal view.

[0020] Figure 5 This is a three-dimensional schematic diagram of a cover plate from the rear view.

[0021] Figure 6 This is a three-dimensional schematic diagram of a circuit board from the rear view.

[0022] The diagram shows: 1-Gearbox, 2-Blade, 3-Heat-conducting plate, 3.1-Heat-conducting connection area, 4-Temperature sensor, 4.1-Back side, 5-Alarm unit, 6-Gear shaft, 7-Shaft hole, 8-Cover plate, 9-Guard plate, 10-Handle, 11-Drive gear, 12-Main gear, 13-Transmission gear, 14-Horn, 15-LED bead, 16-Wire groove, 17-Circuit board. Detailed Implementation

[0023] To better understand this application, various aspects of this application will be described in more detail below with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of exemplary embodiments of this application and are not intended to limit the scope of this application in any way. Throughout the specification, the same reference numerals refer to the same elements.

[0024] like Figures 1 to 6 As shown, this disclosure proposes a pruning shear, including a motor, a gearbox 1 and a blade 2. The gearbox 1 is provided with lubricating grease and also includes a heat-conducting plate 3, a temperature sensor 4 and an alarm unit 5. The gearbox 1 is equipped with the heat-conducting plate 3, and the temperature sensor 4 is installed on the heat-conducting plate 3. The alarm unit 5 is electrically connected to the temperature sensor 4, and the alarm unit 5 issues a lubrication shortage alarm based on the temperature detected by the temperature sensor 4.

[0025] like Figure 1 , 2 As shown in Figure 3, the gearbox 1 includes a drive gear 11, a main gear 12, and a transmission gear 13. The drive gear 11 is connected to the motor shaft, and the motor drives the drive gear 11 to rotate. The drive gear 11 drives the main gear 12 to rotate through the transmission gear 13 after reduction. The main gear 12 drives the blade 2 to perform linear reciprocating motion, thereby forming a shearing action. The main gear 12 is mounted on the gear shaft 6, which remains stationary while the main gear 12 rotates continuously.

[0026] In some embodiments, the heat-conducting plate 3 is configured as one end of the gear shaft 6, which extends to the temperature sensor 4 and is thermally connected.

[0027] In some embodiments, the temperature sensor 4 is a temperature control switch. When the temperature reaches a certain temperature, the temperature control switch activates the alarm unit 5 to sound an alarm. An example of a temperature control switch is the KSD-01F. When the temperature is reached, the temperature control switch powers the alarm unit 5, which then issues an alarm, reminding the user to pay attention to the low grease level and add grease in time, thus significantly extending the service life of the pruning shears. This circuit design is not only very simple and cost-effective, but also highly reliable. Furthermore, due to the high precision of the temperature control switch, the alarm is also very accurate.

[0028] By using temperature control switches with different temperature values, it is possible to easily adjust the settings for different power models.

[0029] like Figure 1 As shown, the alarm unit 5 adopts an audible and visual alarm structure, specifically including a speaker 14 and an LED bead 15. The specific circuit for powering the speaker 14 and the LED bead 15 can be achieved using existing technology, and will not be elaborated here.

[0030] In some embodiments, the temperature sensor 4 is a thermistor, which converts the analog temperature signal into a corresponding electrical signal to control the alarm unit 5 to sound an alarm. For example, the thermistor works in conjunction with a comparator circuit, and the electrical signal from the thermistor controls the comparator circuit to turn on and off, thereby energizing the speaker 14 and the LED bead 15. Alternatively, the thermistor works in conjunction with a transistor circuit, and the electrical signal from the thermistor controls the transistor circuit to turn on and off, thereby energizing the speaker 14 and the LED bead 15.

[0031] In some embodiments, particularly, such as Figure 2 As shown, the heat-conducting plate 3 is connected to the gear shaft 6 of the gearbox 1 for heat conduction, and the heat-conducting plate 3 also serves as a support plate for the gear shaft 6. In this way, the structure is simpler and more compact.

[0032] Furthermore, such as Figure 2 As shown, the heat-conducting plate 3 is disposed on one side of the gearbox 1. The heat-conducting plate 3 is provided with a shaft hole 7. One end of the gear shaft 6 is sleeved with the shaft hole 7. The shaft hole 7 is used to support the gear shaft 6.

[0033] Specifically, see reference. Figure 2 , 6 As shown, the shaft hole 7 also allows the gear shaft 6 to extend to the temperature sensor 4 and be thermally connected. The temperature sensor 4 has a thermally connected portion of the gear shaft 6 on the back of the circuit board 17, and thermal grease can be added for thermal connection.

[0034] In some embodiments, particularly, such as Figure 1 , 4 As shown in Figure 5, the gearbox 1 includes a cover plate 8. A shaft hole 7 is provided in the cover plate 8 along the length of the gearbox 1. A circuit board 17, overlapping the shaft hole 7, is also provided on the cover plate 8. A temperature sensor 4 and an alarm unit 5 are sequentially arranged on the circuit board 17 along the length of the gearbox 1. When the cover plate 8 is installed on the gearbox 1, the gear shaft 6 of the gearbox 1 is inserted into the shaft hole 7. The back surface 4.1 of the temperature sensor 4 is thermally connected to the inserted end of the gear shaft 6 and / or thermally connected through the support plate of the gear shaft 6. In this example, the support plate serves as a heat-conducting plate 3, and both the back surface 4.1 of the temperature sensor 4 and the inserted end of the gear shaft 6, as well as the heat-conducting plate 3, are thermally connected. Figure 4The thermally conductive connection area 3.1, roughly enclosed by the dotted line shown, is thermally connected to the back surface 4.1.

[0035] like Figure 1 , 2 As shown, in the case of setting a support plate, the support plate is set on the cover plate 8. The support plate has a shaft hole 7 along the length direction of the gearbox 1. The circuit board 17 is stacked and fitted with the support plate.

[0036] like Figure 2 As shown, a wire groove 16 is also provided on the cover plate 8 to facilitate wire routing. When using this disclosure, the user holds the handle 10 of the main body of the pruning shears to operate it, and the guard plate 9 provided at the front end of the main body can provide shielding and protection.

[0037] In some embodiments, the gearbox 1 is specifically designed with a metal housing, which serves as the heat-conducting plate 3. The metal housing may be, for example, an aluminum alloy housing.

[0038] When understanding this invention, the above structure may be referred to other embodiments / appendices if necessary. Figure 1 And that is understood, so I will not elaborate further here.

[0039] The above description is merely an illustrative embodiment of the present invention. Therefore, all equivalent changes or modifications made to the structure, features, and principles described in the scope of protection of the present invention are included within the scope of protection of the present invention.

Claims

1. A pruning shear, comprising a motor, a gearbox (1), and blades (2), wherein the gearbox (1) is provided with lubricating grease, characterized in that, It also includes a heat-conducting plate (3), a temperature sensor (4) and an alarm unit (5). The gearbox (1) is equipped with the heat-conducting plate (3), and the temperature sensor (4) is installed on the heat-conducting plate (3). The alarm unit (5) is electrically connected to the temperature sensor (4). The alarm unit (5) issues a lubrication shortage alarm based on the temperature detected by the temperature sensor (4).

2. The pruning shears according to claim 1, characterized in that, The heat-conducting plate (3) is connected to the gear shaft (6) of the gearbox (1) for heat conduction.

3. A pruning shears according to claim 2, characterized in that, The heat-conducting plate (3) also serves as a support plate for the gear shaft (6).

4. A pruning shears according to claim 1, 2, or 3, characterized in that, The heat-conducting plate (3) is set on one side of the gearbox (1). The heat-conducting plate (3) has a shaft hole (7). One end of the gear shaft (6) is sleeved with the shaft hole (7). The shaft hole (7) is used to support the gear shaft (6).

5. A pruning shears according to claim 4, characterized in that, The shaft hole (7) also provides a space for the gear shaft (6) to extend to the temperature sensor (4) and for thermal connection.

6. A pruning shears according to claim 1, characterized in that, The heat-conducting plate (3) is set at one end of the gear shaft (6), which extends to the temperature sensor (4) and is thermally connected.

7. A pruning shears according to claim 1, characterized in that, The temperature sensor (4) uses a temperature control switch. When the temperature control switch reaches the set temperature, the alarm unit (5) is activated to trigger an alarm.

8. A pruning shears according to claim 7, characterized in that, The alarm unit (5) adopts an audible and visual alarm structure.

9. A pruning shears according to claim 1 or 7, characterized in that, The gearbox (1) includes a cover plate (8), in which a shaft hole (7) is provided along the length direction of the gearbox (1). The cover plate (8) is also provided with a circuit board (17) overlapping the shaft hole (7). A temperature sensor (4) and an alarm unit (5) are sequentially arranged on the circuit board (17) along the length direction of the gearbox (1). When the cover plate (8) is installed on the gearbox (1), the gear shaft (6) of the gearbox (1) is inserted and fitted in the shaft hole (7). The back side (4.1) of the temperature sensor (4) is thermally connected to the inserted end of the gear shaft (6) and / or thermally connected through the support plate of the gear shaft (6).

10. A pruning shears according to claim 9, characterized in that, In the case of setting a support plate, the support plate is set on the cover plate (8). The support plate has a shaft hole (7) along the length direction of the gearbox (1). The circuit board (17) is stacked and fitted with the support plate. When the cover plate (8) is installed on the gearbox (1), the gear shaft (6) of the gearbox (1) is inserted and fitted in the shaft hole (7). The back side (4.1) of the temperature sensor (4) is thermally connected to the inserted end of the gear shaft (6) and / or thermally connected through the support plate of the gear shaft (6).

11. A pruning shears according to claim 1, 2, or 3, characterized in that, The temperature sensor (4) uses a thermistor, which converts the analog temperature signal into a corresponding electrical signal to control the alarm unit (5) to trigger an alarm.

12. A pruning shears according to claim 1, 2, or 3, characterized in that, The gearbox (1) uses a metal housing, which serves as the heat-conducting plate (3).

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