Pruning machine

Abstract

The invention discloses a pruning machine, which is characterized by comprising a main machine, an auxiliary machine and a driving device, the power device comprises a motor, and the motor is arranged in the shell and is used for driving the pruning machine to work; the battery pack provides energy for the motor; the motor comprises a stator and a rotor; the outer diameter of the motor is larger than or equal to 45 mm and smaller than or equal to 70 mm. The stator comprises a core formed by laminating a plurality of punching sheets, the core has a lamination length in the lamination direction of the punching sheets, and the ratio of the outer diameter of the motor to the lamination length is greater than or equal to 1.7 and less than or equal to 3. The pruning machine is convenient to use and long in endurance time.

Description

Technical Field

[0001] The present application relates to the field of power tools, and particularly to a pruning machine. Background Art

[0002] A pruning machine in the related art is usually used to prune shrubs or trees. The pruning machine includes a reciprocating blade assembly. The user sweeps the pruning machine across the plant, thereby operating the pruning machine to trim the messy branches and leaves of the plant. Generally, for a pruning machine powered by a battery, after the battery runs out, the battery needs to be replaced or charged. The poor efficiency of the motor of the pruning machine will result in a short battery life of the pruning machine, and it needs to be frequently charged or the battery needs to be replaced, which is inconvenient to use.

[0003] This part provides background information related to the present application, and these background information are not necessarily prior art. Summary of the Invention

[0004] An object of the present application is to solve or at least alleviate part or all of the above problems. To this end, the object of the present application is to provide a pruning machine that is convenient to use and has a long battery life.

[0005] A pruning machine, characterized in that it includes: a main body, including a housing; a power device, including a motor, the motor is arranged in the housing and is arranged to drive the pruning machine to work; a battery pack, providing energy for the motor; the motor includes a stator and a rotor; the outer diameter of the motor is greater than or equal to 45 mm and less than or equal to 70 mm; the stator includes a core formed by stacking a plurality of punching sheets, the core has a stacking length in the stacking direction of the punching sheets, and the ratio of the outer diameter of the motor to the stacking length is greater than or equal to 1.7 and less than or equal to 3.

[0006] In some embodiments, the no-load speed of the motor is greater than or equal to 8000 rpm and less than or equal to 9000 rpm.

[0007] In some embodiments, it further includes a transmission mechanism, the transmission mechanism includes an externally meshing first gear and a second gear, and the transmission ratio of the second gear to the first gear is greater than or equal to 3 and less than or equal to 6.

[0008] In some embodiments, it further includes a blade assembly arranged to perform reciprocating motion, the blade assembly includes a plurality of teeth, and the plurality of teeth extend in the same direction.

[0009] In some embodiments, the power device includes a fan and a bearing that rotate at least partially synchronously with the motor. When the motor rotates without load, the motor, the fan, and the bearing generate electromagnetic loss, fan loss, and bearing loss respectively. The sum of the electromagnetic loss, fan loss, and bearing loss is defined as the total loss. The ratios of the electromagnetic loss, fan loss, and bearing loss to the total loss are greater than or equal to 50 and less than or equal to 80, greater than or equal to 1 and less than or equal to 5, and greater than or equal to 10 and less than or equal to 40 respectively.

[0010] In some embodiments, the total loss is greater than or equal to 60 W and less than or equal to 100 W.

[0011] In some embodiments, the motor includes a motor shaft, and the length of the motor extending along the motor shaft is greater than or equal to 18 mm and less than or equal to 40 mm.

[0012] In some embodiments, the outer diameter of the stator is greater than or equal to 40 mm and less than or equal to 70 mm, and the stack length is greater than or equal to 20 mm and less than or equal to 35 mm.

[0013] In some embodiments, the pruning machine includes an eccentric assembly, and the ratio of the no-load speed of the eccentric assembly to the eccentricity of the eccentric assembly is greater than or equal to 180 rpm / mm and less than or equal to 315 rpm / mm.

[0014] In some embodiments, it further includes a blade assembly configured to perform reciprocating motion and a support member configured to support the blade assembly. The torsional stiffness of the support member is greater than or equal to 45 Nm / ° and less than or equal to 55 Nm / °.

[0015] The advantages of this application are that the pruning machine is convenient to use and has a long battery life. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a perspective view of a pruning machine according to an embodiment of the present application; Figure 2 is Figure 1 the rear view of the pruning machine in Figure 3 is Figure 2 the cross-sectional view of the pruning machine in Figure 4 is Figure 1 the perspective view of the support member of the pruning machine in Figure 5 is Figure 4 the rear view of the support member of the pruning machine in Figure 6 is Figure 3 the enlarged view of the transmission mechanism of the pruning machine in Figure 7 is Figure 1Stereogram of the power unit of the pruning machine in Figure 8 is Figure 1 Side view of the motor and motor shaft of the pruning machine in Figure 9 is Figure 8 Side view of the motor and motor shaft x2 of the pruning machine in Figure 10 is Figure 1 Top view of the motor and motor shaft of the pruning machine in Figure 11 is Figure 1 Side view of the stator of the pruning machine in Figure 12 is Figure 1 Top view of the stator of the pruning machine in Figure 13 Obtained through the simulation model Figure 1 Pie chart of the ratios of electromagnetic loss, fan loss, and bearing loss of Schemes 1 to 6 of the pruning machine in Figure 14 is Figure 1 Relationship diagram of pruning machine torque and pruning machine speed of the pruning machine in and common pruning machines Figure 15 is Figure 1 Relationship diagram of pruning machine torque and battery pack output current of the pruning machine in and common pruning machines Figure 16 is Figure 1 Relationship diagram of pruning machine torque and pruning machine efficiency of the pruning machine in and common pruning machines Figure 17 is Figure 1 Relationship diagram of transmission ratio, no-load power consumption, and heavy-load current of the pruning machine in and common pruning machines. Detailed implementation mode

[0017] Before explaining any implementation mode of the present application in detail, it should be understood that the present application is not limited to the structural details and component arrangements described in the following description or shown in the above drawings.

[0018] In the present application, the terms "include", "comprise", "have" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the presence of another identical element in the process, method, article or device including that element.

[0019] In this application, the term "and / or" describes the relationship between associated objects and represents three possible relationships. For example, a and / or b can represent: a exists alone, a and b exist simultaneously, or b exists alone. Additionally, in this application, the character " / " generally indicates that the associated objects before and after are in an "and / or" relationship.

[0020] In this application, the terms "connect", "combine", "couple", and "mount" can be direct connections, combinations, couplings, or mounts, or they can be indirect connections, combinations, couplings, or mounts. Here, for example, a direct connection means that two parts or components are connected together without an intermediate member, and an indirect connection means that two parts or components are each connected to at least one intermediate member, and these two parts or components are connected through the intermediate member. In addition, "connect" and "couple" are not limited to physical or mechanical connections or couplings and can include electrical connections or couplings.

[0021] In this application, those of ordinary skill in the art will understand that relative terms used in combination with a quantity or condition (such as "about", "approximately", "substantially", etc.) include the stated value and have the meaning indicated by the context. For example, such relative terms at least include the degree of error associated with the measurement of a specific value, tolerances caused by manufacturing, assembly, use, etc. associated with a specific value. Such terms should also be considered to disclose a range defined by the absolute values of two endpoints. The relative term can refer to a plus or minus of a certain percentage (such as 1%, 5%, 10% or more) of the indicated value. A numerical value without a relative term should also be disclosed as a specific value with a tolerance. Additionally, when expressing a relative angular positional relationship (such as substantially parallel, substantially perpendicular), "substantially" can refer to a plus or minus of a certain number of degrees (such as 1 degree, 5 degrees, 10 degrees or more) from the indicated angle.

[0022] In this application, those of ordinary skill in the art will understand that the functions performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the functions performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0023] In this application, the orientation terms such as "upper", "lower", "left", "right", "front", and "rear" are described based on the orientation and positional relationship shown in the drawings, and should not be construed as a limitation on the embodiments of this application. In addition, in the context, it should also be understood that when it is mentioned that an element is connected "above" or "below" another element, it can not only be directly connected "above" or "below" another element, but also be indirectly connected "above" or "below" another element through an intermediate element. It should also be understood that the orientation terms such as the upper side, the lower side, the left side, the right side, the front side, and the rear side not only represent the positive orientation, but can also be understood as the side orientation. For example, the lower side can include directly below, lower left, lower right, lower front, and lower rear, etc.

[0024] In this application, the terms "controller", "processor", "central processing unit", "CPU", and "MCU" can be used interchangeably. When using the units "controller", "processor", "central processing unit", "CPU", or "MCU" to perform specific functions, unless otherwise specified, these functions can be performed by a single one of the above units or multiple of the above units.

[0025] In this application, the terms "device", "module", or "unit" can be implemented in the form of hardware or software in order to achieve specific functions.

[0026] In this application, the terms "calculate", "judge", "control", "determine", "identify", etc. refer to the operations and processes of a computer system or a similar electronic computing device (such as a controller, a processor, etc.).

[0027] The technical solution of this application will be further described below with reference to the drawings and through specific implementation manners.

[0028] This embodiment provides a pruning machine 100. As Figures 1 to 3As shown, the pruning machine 100 provided in this embodiment is a unidirectional pruning machine 100. The length of the pruning machine 100 is greater than or equal to 900 mm and less than or equal to 1500 mm. Users usually walk in one direction to use the pruning machine 100. In some embodiments, the pruning machine 100 can also be a bidirectional pruning machine 100. The pruning machine 100 includes a first handle 111, a second handle 112, and a main body 110. The first handle 111 and the second handle 112 are respectively arranged at the middle part and the tail part of the main body 110. The first handle 111 includes a first gripping portion 113, and the second handle 112 includes a second gripping portion 114. The user's left and right hands respectively hold the first gripping portion 113 and the second gripping portion 114 to walk while carrying the pruning machine 100 with both hands. The main body 110 includes a housing 120, and an accommodation cavity 121 is formed inside the housing 120. The pruning machine 100 includes a power device 130. The power device 130 includes a motor 131, and the motor 131 is installed in the accommodation cavity 121. The motor 131 drives the pruning machine 100 to perform pruning work. In this embodiment, the motor 131 is an electric motor. The no-load speed of the motor 131 is greater than or equal to 8000 rpm and less than or equal to 9000 rpm. In some instances, the no-load speed of the motor 131 is greater than or equal to 8200 rpm and less than or equal to 8800 rpm. In some instances, the no-load speed of the motor 131 is greater than or equal to 8300 rpm and less than or equal to 8600 rpm. The housing 120 includes a connection portion 122. The connection portion 122 is used to connect to a DC power supply. In this embodiment, the connection portion 122 is detachably installed with a battery pack 115. The battery pack 115 provides energy for the motor 131, and the energy is electrical energy. The battery pack 115 can include cylindrical battery cells or pouch battery cells.

[0029] As Figures 1 to 5As shown, the pruning machine 100 further includes a blade assembly 140 and a transmission mechanism 150. The transmission mechanism 150 is drivingly connected to the motor 131 and the blade assembly 140. In this way, electrical energy is transmitted to the motor 131, and the driving force of the motor 131 is then transmitted to the blade assembly 140 through the transmission mechanism 150. The blade assembly 140 reciprocates under the drive of the motor 131 and the transmission mechanism 150. The blade assembly 140 includes a first blade 141, a second blade 142, and a support member 143. The blade assembly 140 includes a plurality of teeth 144 that extend in the same direction. The first blade 141 and the second blade 142 extend substantially along a first straight line 101, and the extending direction of the plurality of teeth 144 is substantially perpendicular to the first straight line 101. The support member 143 supports at least a part of the blade during movement. When the blade assembly 140 moves, it will vibrate, and the vibration will cause the first blade 141 and the second blade 142 to rub against each other, increasing power loss and reducing battery life. Under the action of gravity, the first blade 141 and the second blade 142 will sag, resulting in increased friction between the first blade 141 and the second blade 142. The torsional stiffness of the support member 143 is greater than or equal to 45 Nm / ° and less than or equal to 55 Nm / °. In this way, the support member 143 can provide sufficient support for the blade assembly 140. When the blade assembly 140 reciprocates, the vibration amplitude is small, the friction degree is light, and the power loss is small. The support member 143 has a length L1, a thickness L2, and a width L3 as shown in Figure 4 and Figure 5 . The length L1 of the support member 143 is greater than or equal to 400 mm and less than or equal to 1000 mm. The sum of the weights of the first blade 141 and the second blade 142 is greater than or equal to 360 g and less than or equal to 440 g. The ratio of the thickness L2 to the width L3 of the support member 143 is greater than or equal to 0.4 and less than or equal to 0.6. In this way, the ratio of the thickness L2 of the support member 143 to the width L3 is relatively high, and the support member 143 has high strength and can stably support the blade assembly 140 with a long length.

[0030] When one end of the blade assembly 140 is fixed and the blade is held flat, the height by which the free end of the blade assembly 140 drops due to its own gravity is less than 10 mm. In some embodiments, the height by which the free end of the blade assembly 140 drops is less than or equal to 5 mm. In some embodiments, the height by which the free end of the blade assembly 140 drops is less than or equal to 2 mm. In some embodiments, the height by which the free end of the blade assembly 140 drops is less than or equal to 1 mm. The support member 143 with greater stiffness and strength causes the free end of the blade assembly 140 to drop less under gravity, the vibration degree of the blade assembly 140 is light, the friction is small, and the overall loss of the machine is small.

[0031] As shown in Figure 6As shown, the transmission mechanism 150 is used to decelerate the rotation of the motor 131. The transmission mechanism 150 includes a first gear 151, a second gear 152, and an eccentric assembly 153. The motor 131 includes a motor shaft 132, and the motor shaft 132 extends substantially along the second straight line 102. The first gear 151 is sleeved on the motor shaft 132. The transmission mechanism 150 includes a transmission shaft 154, and the transmission shaft 154 extends substantially along the third straight line 103. The second straight line 102 and the third straight line 103 are parallel and non-overlapping. The second gear 152 and the eccentric assembly 153 are sleeved on the transmission shaft 154. The first gear 151 and the second gear 152 are externally meshed. The diameter of the second gear 152 is larger than that of the first gear 151 to achieve a deceleration effect. The second gear 152 and the first gear 151 are externally meshed through a layer of gear teeth 144 to decelerate the motor 131 once. The transmission ratio of the second gear 152 to the first gear 151 is greater than or equal to 3 and less than or equal to 6. In some embodiments, the transmission ratio of the second gear 152 to the first gear 151 is greater than or equal to 3 and less than or equal to 5. In some embodiments, the transmission ratio of the second gear 152 to the first gear 151 is greater than or equal to 3 and less than or equal to 4. In some embodiments, the transmission ratio of the second gear 152 to the first gear 151 is greater than or equal to 3.5 and less than or equal to 4. Through research, it is found that the first gear 151 and the second gear 152 are externally meshed, and the transmission ratio of the second gear 152 to the first gear 151 is greater than or equal to 3 and less than or equal to 6, making the structure simple, the power loss of the transmission mechanism 150 small, and increasing the battery life of the pruning machine 100.

[0032] The eccentric assembly 153 includes a first eccentric member 155 and a second eccentric member 156. The eccentric assembly 153 has an eccentricity L4. It can be understood that the first eccentric member 155 and the second eccentric member 156 have the same eccentricity L4. The definition of the eccentricity L4 is prior art and will not be elaborated here. The eccentric assembly 153 directly drives the blade assembly 140 to perform reciprocating motion. The ratio of the no-load speed of the eccentric assembly 153 to the eccentricity L4 of the eccentric assembly 153 is greater than or equal to 180 rpm / mm and less than or equal to 315 rpm / mm. In some embodiments, the ratio of the no-load speed of the eccentric assembly 153 to the eccentricity L4 of the eccentric assembly 153 is greater than or equal to 200 rpm / mm and less than or equal to 300 rpm / mm. In some embodiments, the ratio of the no-load speed of the eccentric assembly 153 to the eccentricity L4 of the eccentric assembly 153 is greater than or equal to 220 rpm / mm and less than or equal to 280 rpm / mm. In some embodiments, the ratio of the no-load speed of the eccentric assembly 153 to the eccentricity L4 of the eccentric assembly 153 is greater than or equal to 230 rpm / mm and less than or equal to 270 rpm / mm. In this way, the power loss of the transmission mechanism 150 is small, and the battery life of the pruning machine 100 is increased.

[0033] As shown Figures 7 to 12 In this embodiment, the motor 131 is an outer rotor motor. The motor 131 includes a stator 133 and a rotor 134. The rotor 134 is sleeved on the stator 133. The outer diameter L5 of the motor is greater than or equal to 45 mm and less than or equal to 70 mm. In some embodiments, the outer diameter L5 of the motor is greater than or equal to 45 mm and less than or equal to 65 mm. In some embodiments, the outer diameter L5 of the motor is greater than or equal to 50 mm and less than or equal to 70 mm. In some embodiments, the outer diameter L5 of the motor is greater than or equal to 50 mm and less than or equal to 65 mm. The stator 133 includes a core 137, which is formed by laminating a plurality of punching sheets. The core 137 has a stack length L8 in the direction of punching sheet lamination. The ratio of the outer diameter L5 of the motor to the stack length L8 is greater than or equal to 1.7 and less than or equal to 3. In some embodiments, the ratio of the outer diameter L5 of the motor to the stack length L8 is greater than or equal to 2 and less than or equal to 3. In some embodiments, the ratio of the outer diameter L5 of the motor to the stack length L8 is greater than or equal to 2.2 and less than or equal to 2.8. In some embodiments, the ratio of the outer diameter L5 of the motor to the stack length L8 is greater than or equal to 2 and less than or equal to 4. In some embodiments, the ratio of the outer diameter L5 of the motor to the stack length L8 is approximately 1.7, 1.8, 1.9, 2, or 2.1. In some embodiments, the motor 131 can also be an inner rotor motor. Through research, it is obtained that the outer diameter L5 of the motor is greater than or equal to 50 mm and less than or equal to 65 mm, and the ratio of the outer diameter L5 of the motor to the stack length L8 is greater than or equal to 1.7 and less than or equal to 3, so that the power loss of the transmission mechanism 150 is small and the battery life of the pruning machine 100 is increased.

[0034] The length L6 of the motor extending along the motor axis is greater than or equal to 18 mm and less than or equal to 40 mm. In some embodiments, the length L6 of the motor extending along the motor axis is greater than or equal to 20 mm and less than or equal to 35 mm. In some embodiments, the length L6 of the motor extending along the motor axis is greater than or equal to 25 mm and less than or equal to 30 mm. In this embodiment, the outer diameter L5 of the motor is approximately 50 mm, and the length L6 of the motor extending along the motor axis is approximately 35 mm. In this embodiment, since the motor 131 is an outer rotor motor, it can be considered that the outer diameter of the rotor 134 is approximately 50 mm, and the length of the rotor 134 extending along the motor shaft 132 is approximately 35 mm.

[0035] The outer diameter L7 of the stator is greater than or equal to 40 mm and less than or equal to 70 mm. In some embodiments, the outer diameter L7 of the stator is greater than or equal to 42 mm and less than or equal to 60 mm. In some embodiments, the outer diameter L7 of the stator is greater than or equal to 43 mm and less than or equal to 50 mm. In some embodiments, the outer diameter L7 of the stator is greater than or equal to 44 mm and less than or equal to 48 mm.

[0036] The stack length L8 of the stator is greater than or equal to 20 mm and less than or equal to 35 mm. In some embodiments, the stack length L8 of the stator is greater than or equal to 20 mm and less than or equal to 35 mm. In some embodiments, the stack length L8 of the stator is greater than or equal to 22 mm and less than or equal to 33 mm. In some embodiments, the stack length L8 of the stator is greater than or equal to 24 mm and less than or equal to 31 mm. In some embodiments, the stack length L8 of the stator is greater than or equal to 25 mm and less than or equal to 28 mm. In this embodiment, the stack length L8 of the stator is approximately 25 mm.

[0037] The outer diameter L5 of the motor is greater than or equal to 50 mm and less than or equal to 65 mm, the length L6 of the motor extending along the motor axis is greater than or equal to 18 mm and less than or equal to 40 mm, the outer diameter L7 of the stator is greater than or equal to 40 mm and less than or equal to 70 mm, and the stack length L8 of the stator is greater than or equal to 20 mm and less than or equal to 35 mm. In this way, the size of the motor 131 is reasonable. When the motor 131 is used on the pruning machine 100, the motor has high efficiency, reasonable size, and strong load capacity.

[0038] Such as Figures 7 to 9As shown, the power device 130 includes a fan 135 and a bearing 136 that rotate at least partially synchronously with the motor 131. The fan 135 dissipates heat from the motor 131, and the bearing 136 rotatably connects the motor 131 and the housing 120. When the motor 131 rotates without load, the motor 131, the fan 135, and the bearing 136 generate electromagnetic loss, fan loss, and bearing loss respectively. The sum of the electromagnetic loss, fan loss, and bearing loss is defined as the total loss. The unit of measurement for loss is W. The ratios of the electromagnetic loss, fan loss, bearing loss, and total loss are greater than or equal to 50 and less than or equal to 80, greater than or equal to 1 and less than or equal to 5, and greater than or equal to 10 and less than or equal to 40 respectively. In some embodiments, the ratios of the electromagnetic loss, fan loss, bearing loss, and total loss are greater than or equal to 55 and less than or equal to 78, greater than or equal to 1.5 and less than or equal to 4, and greater than or equal to 13 and less than or equal to 35 respectively. In some embodiments, the ratios of the electromagnetic loss, fan loss, bearing loss, and total loss are greater than or equal to 60 and less than or equal to 70, greater than or equal to 1.7 and less than or equal to 3, and greater than or equal to 15 and less than or equal to 30 respectively. Through research, it is found that when the ratios of the electromagnetic loss, fan loss, bearing loss, and total loss are greater than or equal to 50 and less than or equal to 80, greater than or equal to 1 and less than or equal to 5, and greater than or equal to 10 and less than or equal to 40 respectively, the power device 130 has high efficiency, the pruning machine 100 has a long battery life, and the pruning machine 100 has strong working capabilities under both light-load and heavy-load conditions. Through the research and design of the motor size, the proportion of the electromagnetic loss in the total loss is maximized, the bearing 136 has appropriate strength and moderate loss, and through the design of the transmission structure, the rotation speed of the fan 135 is reduced, so that the proportion of the fan loss is minimized and the temperature rise is balanced. In this way, the proportion of the electromagnetic loss is approximately three times the sum of the proportions of the fan 135 and bearing losses. The energy consumption for pruning work accounts for the largest proportion, and the energy consumption weakly related to pruning work accounts for a small proportion. The power device 130 has high efficiency and the pruning machine 100 has a long battery life.

[0039] The total loss is greater than or equal to 60 W and less than or equal to 100 W. In some embodiments, the total loss is greater than or equal to 70 W and less than or equal to 90 W. In some embodiments, the total loss is approximately 80 W. The electromagnetic loss, fan loss, and bearing loss are greater than or equal to 40 W and less than or equal to 60 W, greater than or equal to 2 W and less than or equal to 5 W, and greater than or equal to 15 W and less than or equal to 30 W respectively.

[0040] The output voltage of the battery pack 115 is greater than or equal to 40V and less than or equal to 62V, and the output current of the battery pack 115 is greater than or equal to 1A and less than or equal to 1.5A. In some embodiments, the output voltage of the battery pack 115 is greater than or equal to 45V and less than or equal to 58V, and the output current of the battery pack 115 is greater than or equal to 1.1A and less than or equal to 1.4A. In some embodiments, the output voltage of the battery pack 115 is about 56V, and the output current of the battery pack 115 is greater than or equal to 1.2A and less than or equal to 1.4A. The pruning machine 100 is usually matched with the same battery pack 115 platform as other power tools. Without changing the battery pack 115 platform, that is, when the output voltage of the battery pack 115 remains unchanged, the output current of the battery pack 115 is small, the overall power loss of the machine is small, the overall efficiency of the machine is high, and the pruning machine 100 has a long battery life. In this embodiment, the capacity of the battery pack 115 is greater than or equal to 5Ah. When the battery pack 115 discharges at a current of 1.3A, the battery life of the pruning machine 100 is greater than or equal to 3.5h, and the battery life is long. When the battery pack 115 discharges at a current of 1.2A, the battery life of the pruning machine 100 is greater than or equal to 4h. When the battery pack 115 discharges at a current of 1.4A, the battery life of the pruning machine 100 is greater than or equal to 3h. The pruning machine 100 has a long battery life, the frequency of the user charging or replacing the battery pack 115 is reduced, and it is convenient to use.

[0041] The following elaborates on the specific process in which when the outer diameter L5 of the motor is greater than or equal to 45mm and less than or equal to 70mm, the ratio of the outer diameter L5 to the stack length L8 of the motor is greater than or equal to 1.7 and less than or equal to 3, which has a beneficial effect on improving the overall efficiency of the machine and the battery life of a single battery pack 115.

[0042] During the research process, first, simulation models are established for the three-electricity model (battery, electric control, electric drive model), transmission model, and blade assembly model. After modeling, the simulation model is checked against the actual measurements of the real machine. After the differences between the simulation model and the actual measurements of the real machine meet the standards, that is, the check passes. Finally, the simulation objectives are input into the simulation model, and through the simulation model, simulation and analysis are carried out to obtain a better solution.

[0043] The simulation objectives in this embodiment include the no-load speed at the output end of the pruning machine and the limit on the output current of the battery pack. The speed at the output end of the pruning machine can be understood as the speed of the decelerated transmission mechanism and is the speed output by the pruning machine. In this embodiment, the decelerated transmission mechanism includes a second gear and an eccentric assembly. Hereinafter, the speed at the output end of the pruning machine will be simply referred to as the pruning machine speed. The torque at the output end of the pruning machine can be understood as the torque of the blade assembly, hereinafter simply referred to as the pruning machine torque.

[0044] This application conducts simulations through a simulation model. After analysis, a solution with lower total losses and longer battery life is obtained. According to the simulation results, the total losses of Solution 3, Solution 5, and Solution 6 are less than 90 W and less than or equal to 85 W. The outer diameter of the motor in Solution 3, Solution 5, and Solution 6 is greater than or equal to 45 mm and less than or equal to 70 mm, and the ratio of the outer diameter to the stack length of the motor is greater than or equal to 1.7 and less than or equal to 3. In other words, when the outer diameter of the motor is greater than or equal to 45 mm and less than or equal to 70 mm, and the ratio of the outer diameter to the stack length of the motor is greater than or equal to 1.7 and less than or equal to 3, the total losses of the pruning machine are smaller. Among them, the total losses of Solution 3 and Solution 6 are the lowest, being 77 W and 80 W respectively. Considering that the transmission ratio of Solution 6 is greater than or equal to 3 and less than or equal to 6, and the transmission ratio is relatively large, the heavy-load capacity of the pruning machine is better than that of Solution 3. Therefore, Solution 6 is taken as an embodiment of this application and is a solution with relatively excellent comprehensive capabilities for the pruning machine.

[0045] When the outer diameter L5 of the motor is greater than or equal to 45 mm and less than or equal to 70 mm, there is room to design the stack length of the stator longer, and the ratio of the outer diameter L5 to the stack length L8 of the motor can be made greater than or equal to 1.7 and less than or equal to 3. The motor with an outer diameter L5 greater than or equal to 45 mm and less than or equal to 70 mm has a larger volume, slower speed, and less iron loss. Therefore, the load of the gear can be transferred to the motor, and the transmission ratio can be reduced. With external gear meshing and a small transmission ratio, the temperature rise of the gear is small, and the speed of the fan can be appropriately reduced, resulting in reduced fan losses.

[0046] Figure 13 It is a pie chart showing the ratios of the electromagnetic loss, fan loss, and bearing loss to the total loss of the pruning machines of Solution 1 to Solution 6. In Solution 3, Solution 5, and Solution 6, the ratios of the electromagnetic loss, fan loss, and bearing loss to the total loss are greater than or equal to 50 and less than or equal to 80, greater than or equal to 1 and less than or equal to 5, and greater than or equal to 10 and less than or equal to 40 respectively. In Solution 3, Solution 5, and Solution 6, the ratios of the electromagnetic loss, fan loss, and bearing loss to the total loss are greater than or equal to 60 and less than or equal to 80, greater than or equal to 1 and less than or equal to 4, and greater than or equal to 20 and less than or equal to 30 respectively.

[0047] Figures 14 to 16They are the relationship diagrams of the pruning machine torque and the pruning machine rotation speed, the relationship diagram of the pruning machine torque and the battery pack output current, and the relationship diagram of the pruning machine torque and the pruning machine efficiency. The data for drawing the relationship diagrams comes from the simulation model of this application. The three relationship diagrams respectively reflect the cutting speed, battery life, and usage efficiency of the pruning machine. The solid lines in the diagrams represent the parameter changes of the pruning machine of this application at different pruning machine torques, and the dashed lines in the diagrams represent the parameter changes of conventional pruning machines at different pruning machine torques. It should be understood that the pruning machine torque during the operation of pruning machines on the market is usually less than 1.7 Nm. The usage conditions of the pruning machine are generally divided into no-load, light load, medium load, and heavy load. At no-load, the motor rotates, but the pruning machine does not prune plants such as shrubs, and the pruning machine torque is less than 0.1 Nm. At light load, the pruning machine torque is greater than or equal to 0.1 Nm and less than or equal to 0.3 Nm. Light load is generally the most commonly used usage condition of the pruning machine. At medium load, the pruning machine torque is greater than or equal to 0.3 Nm and less than or equal to 1 Nm. At heavy load, the pruning machine torque is greater than or equal to 1 Nm and less than or equal to 1.7 Nm.

[0048] Figure 14 It is the relationship diagram of the pruning machine torque and the pruning machine rotation speed. At the same pruning machine torque, the higher the pruning machine rotation speed, the higher the operation efficiency of the pruning machine. It can be seen from the diagram that at the same pruning machine torque, the pruning machine rotation speed of the pruning machine of this application is greater than that of the conventional pruning machine. Compared with the conventional pruning machine, the operation efficiency of the pruning machine of this application is higher.

[0049] Figure 15 It is the relationship diagram of the pruning machine torque and the battery pack output current. At the same pruning machine torque, the lower the battery pack output current, the longer the usage time of the battery pack and the longer the battery life of the pruning machine. It can be seen from the diagram that at the same pruning machine torque, the battery pack output current of the pruning machine of this application is less than that of the conventional pruning machine. Compared with the conventional pruning machine, the battery life of the pruning machine of this application is stronger.

[0050] Figure 16 It is the relationship diagram of the pruning machine torque and the pruning machine efficiency. At the same pruning machine torque, the higher the pruning machine efficiency, the smaller the power consumption of the pruning machine, and the higher the pruning machine efficiency, the longer the battery life of the pruning machine. It can be seen from the diagram that at the same pruning machine torque, the pruning machine efficiency of the pruning machine of this application is higher than that of the conventional pruning machine. Compared with the conventional pruning machine, the pruning machine of this application has higher pruning machine efficiency, smaller power consumption, and longer battery life. Especially under light load and medium load conditions, the pruning machine efficiency of this application is much higher than that of the conventional pruning machine, and the battery life of the pruning machine of this application is much higher than that of the conventional pruning machine.

[0051] Figure 17It is a graph showing the relationship among transmission ratio, no-load power consumption and heavy-load current. The function of increasing the transmission ratio is to reduce the rotational speed of the motor and increase the torque of the motor. The mechanical load output by the pruning machine is equal to the product of the transmission ratio and the motor load. When the magnitude of the mechanical load of the pruning machine remains unchanged, the larger the transmission ratio, the smaller the motor load and the smaller the current demand. It is obtained through simulation that when the transmission ratio is greater than or equal to 3 and less than or equal to 6, the curve of the no-load power consumption is relatively smooth. When the transmission ratio is greater than or equal to 3 and less than or equal to 5, as the transmission ratio increases, the heavy-load current decreases, the heavy-load capacity increases, the current demand decreases, and the increase in the transmission ratio has little effect on the no-load power consumption. When the transmission ratio is greater than or equal to 3 and less than or equal to 4, the increase in the transmission ratio has almost no effect on the no-load power consumption. Therefore, when the transmission ratio is greater than or equal to 3 and less than or equal to 6, the pruning machine has low no-load power consumption and strong heavy-load capacity, and the working ability of the pruning machine is balanced on the premise of reducing power consumption.

[0052] The above embodiments only illustrate the basic principles and characteristics of the present application. The present application is not limited by the above embodiments. Without departing from the spirit and scope of the present application, there are various changes and modifications to the present application, and these changes and modifications all fall within the scope of the present application claimed. The scope of protection claimed by the present application is defined by the appended claims and their equivalents.

Claims

1. A pruning machine, characterized in that, Comprising: A main body, including a housing; A power device, including a motor, the motor being disposed within the housing and configured to drive the pruning machine to operate; A battery pack, providing energy for the motor; The motor includes a stator and a rotor; The outer diameter of the motor is greater than or equal to 45 mm and less than or equal to 70 mm; The stator includes a core formed by laminating a plurality of punching sheets, the core having a stacking length in the direction of punching sheet lamination, and the ratio of the outer diameter of the motor to the stacking length is greater than or equal to 1.7 and less than or equal to 3.

2. The pruning machine according to claim 1, wherein, The no-load speed of the motor is greater than or equal to 8000 rpm and less than or equal to 9000 rpm.

3. The pruning machine according to claim 1, characterized in that, It further includes a transmission mechanism, the transmission mechanism including an externally meshing first gear and a second gear, and the transmission ratio of the second gear to the first gear is greater than or equal to 3 and less than or equal to 6.

4. The pruning machine according to claim 1, characterized in that, It further includes a blade assembly configured to perform reciprocating motion, the blade assembly including a plurality of teeth, and the plurality of teeth extending in the same direction.

5. The pruning machine according to claim 1, characterized in that, The power device includes a fan and a bearing that rotate at least partially synchronously with the motor. When the motor rotates without load, the motor, the fan, and the bearing respectively generate electromagnetic loss, fan loss, and bearing loss. Define the sum of the electromagnetic loss, the fan loss, and the bearing loss as the total loss. The ratios of the electromagnetic loss, the fan loss, the bearing loss, and the total loss are respectively greater than or equal to 50 and less than or equal to 80, greater than or equal to 1 and less than or equal to 5, and greater than or equal to 10 and less than or equal to 40.

6. The pruning machine according to claim 5, characterized in that The total loss is greater than or equal to 60 W and less than or equal to 100 W.

7. The pruning machine according to claim 1, wherein The motor includes a motor shaft, and the length of the motor extending along the motor shaft is greater than or equal to 18 mm and less than or equal to 40 mm.

8. The pruning machine according to claim 1, characterized in that, The outer diameter of the stator is greater than or equal to 40 mm and less than or equal to 70 mm, and the stacking length is greater than or equal to 20 mm and less than or equal to 35 mm.

9. The pruning machine according to claim 1, characterized in that, The pruning machine includes an eccentric assembly, and the ratio of the no-load speed of the eccentric assembly to the eccentricity of the eccentric assembly is greater than or equal to 180 rpm / mm and less than or equal to 315 rpm / mm.

10. The pruning machine according to claim 1, characterized in that It further includes a blade assembly configured to perform reciprocating motion, and a support member configured to support the blade assembly, and the torsional stiffness of the support member is greater than or equal to 45 Nm / ° and less than or equal to 55 Nm / °.

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