CN211353196U - Pruning machine - Google Patents

Abstract

The utility model provides a pruner, include handle components, install the power unit of handle components one end and with the sword strip subassembly that power unit links to each other, power unit includes casing assembly, accepts the motor in casing assembly and installs power transmission assembly on the casing assembly, the motor is the external rotor electric machine that the diameter is more than or equal to 50mm, power transmission assembly includes intermeshing's first gear and second gear, the coaxial cover of first gear is established on external rotor electric machine's the output shaft, just the drive ratio of first gear and second gear is less than 6. Compared with the prior art, the utility model discloses a pruner can guarantee to obtain the best output effect under the unchangeable condition of motor output, and motor speed is low moreover, turning moment is big, the electric current is low, generate heat for a short time, the energy consumption ratio improves by a wide margin.

Description

Pruning machine

Technical Field

The utility model relates to a garden instrument especially relates to a pruner.

Background

An electric pruner is a device used for pruning various short bushes, hedges, green plants and other outdoor plants. In general, the power of the electric pruner is output at a high rotating speed and a high transmission ratio, and the structure has the defects of serious heat generation, good heat dissipation, large electric energy consumption and short service time.

In the prior art, although an electric pruner adopting an outer rotor motor is available, the research on the outer rotor motor is only mentioned for use, and does not specifically and deeply research which outer rotor motor can well drive the electric pruner to work, and meanwhile, the specific arrangement of the outer rotor motor and the adoption of a matched heat dissipation structure are also research difficulties in the field of the electric pruner at present.

In view of the above, there is a need for an improvement of the existing electric pruner to solve the above problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a pruner, this pruner not only can obtain best power drive and transmission effect, and motor speed is low moreover, turning moment is big, the electric current is low, generate heat for a short time, the energy consumption ratio improves by a wide margin.

In order to realize the above-mentioned purpose, the utility model provides a pruner, include handle components, install the power unit of handle components one end and with the sword strip subassembly that power unit links to each other, power unit includes casing assembly, accepts the motor in casing assembly and installs power transmission assembly on the casing assembly, the motor is diameter more than or equal to 50 mm's external rotor electric machine, power transmission assembly includes intermeshing's first gear and second gear, the coaxial cover of first gear is established on external rotor electric machine's the output shaft, just the drive ratio of first gear and second gear is less than 6.

As a further improvement of the utility model, the diameter of the outer rotor motor is 64mm, and the transmission ratio of the first gear and the second gear is 2.7.

As a further improvement of the present invention, the output rotation speed of the outer rotor motor is 2000 SPM.

As a further improvement of the present invention, the diameter of the first gear is smaller than the diameter of the second gear.

As a further improvement, the both ends of the relative setting of second gear are equipped with the eccentric wheel portion respectively, the power transmission subassembly is still established two including establishing respectively two crank levers on the eccentric wheel portion, and two a pot head of crank lever is established on the eccentric wheel portion, the other end with the sword strip subassembly links to each other.

As a further improvement of the present invention, in the direction of the center axis of the second gear, two the center axis of the eccentric wheel portion does not overlap, two the one end of the crank lever corresponding to the eccentric wheel portion is the center and does not overlap, the other end connected to the blade assembly is the center and overlaps.

As a further improvement of the utility model, the external rotor electric machine still establishes including the cover external rotor and cover on the output shaft are established the casing in the external rotor and the output shaft outside, the external rotor with form between the casing and dodge the clearance.

As a further improvement of the present invention, the power transmission assembly further includes a bottom cover installed at the bottom of the housing assembly, the bottom cover includes a first bottom cover and a second bottom cover assembled and matched from top to bottom and is formed in the accommodating cavity between the first bottom cover and the second bottom cover, the first gear and the second gear are accommodated in the accommodating cavity.

As a further improvement, one side of the bottom cover close to the blade assembly is extended to form at least two heat dissipation fins, and a heat dissipation channel is formed between two adjacent heat dissipation fins.

As a further improvement of the present invention, the bottom cover accommodates the fan therein, the bottom cover is formed with a blast chamber which covers the outside of the fan completely, the blast chamber is surrounded by two heat dissipating fins on the outermost side to form, the one end of the heat dissipating channel is communicated with the blast chamber, and the other end is communicated with the outside.

The utility model has the advantages that: the utility model discloses a pruner is through setting the motor to the external rotor electric machine that the diameter is more than or equal to 50mm, set the drive ratio of first gear and second gear to being less than 6 simultaneously, thereby can guarantee to obtain the best output effect under the unchangeable condition of motor output, and motor speed is low moreover, turning moment is big, the electric current is low, it is little to generate heat, the energy consumption ratio improves by a wide margin, and then the temperature rise that can effectual control motor and reduction no-load, the energy efficiency is improved, the life of motor has been prolonged.

Drawings

Fig. 1 is a three-dimensional structure view of the pruner of the utility model.

Fig. 2 is an exploded view of the pruner shown in fig. 1.

Fig. 3 is another exploded view of the pruner shown in fig. 1.

Fig. 4 is an exploded view of the handle assembly of fig. 2.

Fig. 5 is an exploded view of the blade assembly of fig. 2.

Figure 6 is an exploded view of the power mechanism of figure 2.

Fig. 7 is an exploded view of the housing assembly of fig. 6.

Fig. 8 is an exploded view of the power transmission assembly of fig. 6.

Fig. 9 is an exploded view of the bottom cap of fig. 8.

Fig. 10 is an exploded view of the power transmission assembly of fig. 8 in cooperation with a blade bar assembly.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1 and 2, the present invention discloses a pruner 100, which comprises a handle assembly 10, a power mechanism 20 mounted at one end of the handle assembly 10, and a blade assembly 30 connected to the power mechanism 20.

Referring to fig. 3 and 4, the handle assembly 10 includes a main handle 11, an auxiliary handle 12 and a protection plate 13, the main handle 11 is a grippable handle structure having a cavity, and a main knife switch, a speed adjusting switch and the like are all disposed on the main handle 11 for a user to operate. The main handle 11 and the auxiliary handle 12 are respectively arranged at two ends of the power mechanism 20, and the auxiliary handle 12 is arranged close to the blade assembly 30, so that a user can conveniently hold and safely start protection. The protection plate 13 is integrally arranged with the auxiliary handle 12 to play a role of protection.

Referring to fig. 3 and 5, the blade assembly 30 includes a pair of cutting blades 31 and a protective decorative plate 32, the pair of cutting blades 31 is detachably disposed in a sliding manner with the power mechanism 20, so that the cutting operation is performed by the power mechanism 20; the protective decorative plate 32 is fixedly disposed at a middle position of the cutting blades 31 and above the pair of cutting blades 31.

Since the handle assembly 10 and the blade assembly 30 are both conventional structures, they will not be described in detail, and the power mechanism 20 will be described in detail in the following description.

Referring to fig. 6 to 10 in combination with fig. 3, the power mechanism 20 includes a housing assembly 21, a motor 22 accommodated in the housing assembly 21, and a power transmission assembly 23 mounted on the housing assembly 21. The housing assembly 21 includes a first housing 211, a second housing 212, and a top cover 213 covering the first housing 211 and the second housing 212. The utility model discloses in, top cap 213 is the metal top cap, first casing 211 and second casing 212 are metal casing, just first casing 211 with the installation of handle component 10 is fixed, second casing 212 with first casing 211 installation is fixed. Of course, the top cover 213 may be a plastic top cover, as long as the same function can be achieved, and is not limited thereto.

The first housing 211 includes a bottom case 2111 and a side portion 2112 protruding from the bottom case 2111 toward the handle assembly 10, the bottom case 2111 has a mounting cavity 2113 formed therein, and the motor 22 is mounted in the mounting cavity 2113. The bottom case 2111 is further provided with a plurality of fixing holes 2114, the fixing holes 2114 penetrate through the bottom case 2111 and are communicated with the mounting cavity 2113, so that screws 40 can pass through the fixing holes 2114, and the bottom case 2111 and the power transmission assembly 23 can be fixed by means of the screws 40 passing through the fixing holes 2114.

The side portion 2112 protrudes from the bottom case 2111 and is fixed to the main handle 11. One side of the side portion 2112 close to the main handle 11 is semicircular, the second housing 212 is fixedly connected with the side portion 2112, and one side of the second housing 212 close to the main handle 11 is also semicircular, so that after the second housing 212 and the side portion 2112 are assembled and fixed, a circular limiting portion 2115 can be formed in a combined manner, the limiting portion 2115 is provided with a circular opening 2116 facing the main handle 11, the limiting portion 2115 is mainly used for being buckled and fixed with the housing of the main handle 11, and the circular opening 2116 is used for allowing the housing of the main handle 11 to pass through, so that the main handle 11 housing is buckled and fixed with the side portion 2112 and the second housing 212 conveniently.

The metal top cover 213 is mounted to the bottom case 2111 and covers over the motor 22 to close the mounting cavity 2113. The metal top cover 213 is integrally formed and provided with a heat dissipation surface 2131, and the first housing 211 and the second housing 212 are combined to be metal housings, so that heat generated by the motor 22 during operation in the metal top cover 213 can be dissipated through the heat dissipation surface 2131, the first housing 211 and the second housing 212, and the heat dissipation efficiency of the pruner 100 is improved.

The metal top cover 213 includes an arched protrusion 2132, a recessed portion 2133 surrounding the arched protrusion 2132, and a mounting portion 2134 tilted from a side of the recessed portion 2133 toward the main handle 11, wherein the mounting portion 2134 is also mounted on the side portion 2112 and the second housing 212. In the axial direction of the motor 22, the upper surface of the recessed portion 2133 is lower than the upper surface of the mounting portion 2134, so that, in a humid environment or in a rainy day, rainwater on the edge of the mounting portion 2134 may slide down to the recessed portion 2133 along the mounting portion 2134 and fall down. Therefore, the metal top cover 213 can also play a role in preventing water and dust.

The side 2112 and the second housing 212 are provided with a PCB board assembly 50 at a position adjacent to the main handle 11, and the PCB board assembly 50 is hidden at the bottom of the metal top cover 213, so that the design aims to: the PCB assembly 50 can be protected from its core components by the metal top cover 213, which is mainly embodied in: 1. the heat dissipation is performed by the metal top cover 213 to prevent the PCB assembly 50 from being damaged due to the over-high temperature; 2. waterproof and dustproof by the metal top cover 213.

In this embodiment, the assembling and fixing of the side portion 2112 and the second housing 212, and the assembling and fixing of the metal top cover 213 and the first housing 211 and the second housing 212 are achieved by the mutual matching of the screw 40 and the screw hole. Of course, in other embodiments, the side portion 2112 and the second housing 212, the metal top cover 213 and the first housing 211 and the second housing 212 may be assembled and fixed in other manners, which is not limited herein.

In this embodiment, the motor 22 is an external rotor motor with a diameter greater than or equal to 50mm, and includes an output shaft 221, an external rotor (not shown) sleeved on the output shaft 221, and a casing 222 sleeved outside the external rotor and the output shaft 221. Because of the motor 22 is the external rotor electric machine, utilizes the external rotor to rotate promptly and drives motor 22 moves, drive then pruner 100 work, consequently the external rotor can not with casing 222 is too close to, the external rotor with need form between the casing 222 and dodge clearance (not shown), and dodge the clearance and can lead to the heat to be difficult for effluvium, consequently, the setting of metal top cap 213 can let the heat give off fast, has improved the utility model discloses pruner 100's radiating efficiency.

The end of the output shaft 221 is provided with a fan 223, and the fan 223 is located at the bottom of the bottom shell 2111 to blow away heat at the bottom of the housing assembly 21, so as to perform a cooling function. Preferably, the fan 223 is installed in the power transmission assembly 23 to simultaneously blow away heat generated when the power transmission assembly 23 operates, thereby cooling the power transmission assembly 23.

The power transmission assembly 23 includes a bottom cover 231 mounted at the bottom of the housing assembly 21, and a first gear 232 and a second gear 233 mounted on the bottom cover 231 and engaged with each other, wherein at least two heat dissipation fins 234 are formed on one side of the bottom cover 231 adjacent to the blade bar assembly 30 in an extending manner, and a heat dissipation channel 235 is formed between two adjacent heat dissipation fins 234.

The fan 223 is received in the bottom cover 231, and a blowing chamber 24 that completely covers the outside of the fan 223 and a heat dissipation channel 25 that is located at the bottom of the blowing chamber 24 and communicates with the outside are formed on one side of the bottom cover 231 that is away from the blade assembly 30. The fan 223 is connected with the output shaft 221 of the motor 22, the blowing chamber 24 is enclosed by two outermost heat dissipation fins 234 and is provided in a closed manner, the heat dissipation channel 25 is provided at an edge of one side of the bottom cover 231, which is far away from the blade assembly 30, and in the width direction of the bottom cover 231, the heat dissipation channel 25 extends in a long strip shape.

The bottom of the blast chamber 24 is further provided with a vent 26 communicated with the outside, and in the length direction of the bottom cover 231, the vent 26 also extends in a long strip shape. Therefore, when the motor shaft 221 rotates, the fan 223 can be driven to rotate, and when the fan 223 rotates, a low pressure area is generated near the fan, and at this time, the vent 26 can supplement external cold air to the fan, and discharge internal hot air through the heat dissipation channel 25, thereby improving the heat dissipation effect.

The utility model discloses in, to dispel the heat channel 25 and vent 26 design for rectangular form, and connect blast chamber 24 and external world, aim at in the thickness direction of bottom 231: the strip-shaped structure can increase the contact area of the cold/hot air with the corresponding ventilation opening 26/heat dissipation channel 25, so that the heat dissipation effect is better, but the invention should not be limited thereto.

The bottom cover 231 includes a first bottom cover 2311 and a second bottom cover 2312 which are assembled and matched up and down, and an accommodating cavity 2313 formed between the first bottom cover 2311 and the second bottom cover 2312, and the first gear 232 and the second gear 233 are accommodated in the accommodating cavity 2313. The first gear 232 is coaxially sleeved on the output shaft 221 of the motor 22, and the diameter of the first gear 232 is smaller than that of the second gear 233, so that when the motor 22 rotates, the output shaft 221 can drive the first gear 232 to rotate, and then the second gear 233 is driven to rotate. In the present invention, the transmission ratio of the first gear 232 and the second gear 233 is less than 6.

The utility model discloses in, set up motor 22 into the external rotor electric machine that the diameter is more than or equal to 50mm, set the drive ratio of first gear 232 and second gear 233 to be less than 6 simultaneously, this is because: under the condition that the output rotating speed (2000SPM) and the output power of the motor 22 are both constant values, when the diameter of the outer rotor is greater than or equal to 50mm, a larger torque can be obtained, and when the transmission ratio of the first gear 232 to the second gear 233 is less than 6, a better output effect and no-load current can be obtained, and the temperature rise of the motor 22 can be well controlled (generally less than 100K, namely 100 degrees). Refer specifically to the experimental results set forth in the table below.

Through a plurality of groups of experimental comparison researches in the table, the following results are found: the optimal diameter of the motor 22 (outer rotor) is 64mm, the optimal gear transmission ratio is 17/46 (namely 2.7 in the table above), and at the moment, the optimal output effect can be obtained under the condition that the output power of the motor is not changed, and the energy consumption ratio is greatly improved.

Eccentric wheel parts 2331 are respectively arranged at two opposite ends of the second gear 233, and the central axes of the two eccentric wheel parts 2331 do not overlap in the direction of the central axis of the second gear 233. The power transmission assembly 23 further includes two crank rods 236 respectively sleeved on the two eccentric wheel portions 2331, one end of each of the two crank rods 236 is sleeved on the corresponding eccentric wheel portion 2331, and the other end is connected to the blade assembly 30, so that when the second gear 233 rotates, the crank rods 236 can be driven to move, and then the blade assembly 30 is driven to move back and forth to perform shearing operation. Preferably, the crank rod 236 is not overlapped with the eccentric wheel 2331 and is overlapped with the blade bar assembly 30, so as to stably transmit power.

In the present invention, the first bottom cover 2311 and the second bottom cover 2312 are assembled by the mutual cooperation of the screw 40 and the screw hole; of course, in other embodiments, the first bottom cover 2311 and the second bottom cover 2312 may be assembled and fixed by other methods, which is not limited herein. It should be understood that the rotational connection between the first gear 232 and the fan 223 and between the eccentric portion 2331 of the second gear 233 and the crank lever 236 are realized by the bearings 60, which is prior art and will not be described in detail.

The blower chamber 24, the heat dissipating fins 234 and the heat dissipating passage 235 are formed at a side of the first bottom cover 2311 facing the housing assembly 21. Specifically, the heat dissipating fin 234 is formed on the first bottom 2311 and is located one side of the fan 223, one end of the heat dissipating channel 235 is communicated with the blast chamber 24, the other end is communicated with the outside, when the motor 22 rotates, the fan 223 rotates synchronously, and the air in the accommodating cavity 2313 is driven to be discharged outwards along the heat dissipating channel 235, and the heat on the motor 22, the power transmission assembly 23 and the heat dissipating fin 234 can be taken away in the process, so that the heat dissipating efficiency of the pruner 100 is improved.

It can be seen that the utility model discloses a pruner 100 has better radiating effect and waterproof dustproof effect, and embodies in following aspect:

1. the metal top cap 213 is integrally formed and has a heat dissipating surface 2131;

2. the first housing 211 and the second housing 212 are both metal housings, which can function as heat dissipation fins;

3. the fan 223 is sleeved on the output shaft 221 of the motor 22 and is positioned at the bottom of the shell assembly 21, so that heat at the bottom of the shell assembly 21 can be blown away, and a cooling effect is achieved;

4. the bottom cover 231 is provided with a heat dissipation channel 25, heat dissipation fins 234 and a heat dissipation channel 235 between two adjacent heat dissipation fins 234, so that heat on the motor 22, the power transmission assembly 23 and the heat dissipation fins 234 can be taken away, and a cooling effect is achieved;

5. the metal top cover 213 is integrally formed and is provided with a concave part 2133 at a lower position, so that rainwater at the edge of the mounting part 2134 can be guided to the concave part 2133, and a waterproof effect is achieved; compared with a plurality of block-shaped shells which are spliced left and right, the top surface of the metal top cover 213 has no gap, so that water and dust are not easy to leak, and the waterproof and dustproof effects are realized.

To sum up, the utility model discloses a pruner 100 is through setting motor 22 to the external rotor electric machine that the diameter is greater than or equal to 50mm, set first gear 232 and second gear 233's drive ratio to simultaneously and be less than 6, thereby can guarantee to obtain the best output effect under the unchangeable condition of motor 22 output, and motor 22 rotational speed is low, turning torque is big, the electric current is low, it is little to generate heat, the energy consumption ratio improves by a wide margin, and then can effectual control motor 22's temperature rise and reduction no-load, the energy efficiency is utilized, the life of extension motor 22.

The above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the present invention.

Claims (10)

1. The utility model provides a pruner, includes the handle components, installs the power unit of handle components one end and with the sword strip subassembly that power unit links to each other, power unit includes the casing subassembly, accepts the motor in the casing subassembly and installs power transmission assembly on the casing subassembly, its characterized in that: the motor is an outer rotor motor with the diameter being larger than or equal to 50mm, the power transmission assembly comprises a first gear and a second gear which are meshed with each other, the first gear is coaxially sleeved on an output shaft of the outer rotor motor, and the transmission ratio of the first gear to the second gear is smaller than 6.

2. The pruner of claim 1, wherein: the diameter of the outer rotor motor is 64mm, and the transmission ratio of the first gear to the second gear is 2.7.

3. The pruner of claim 2, wherein: the output rotating speed of the outer rotor motor is 2000 SPM.

4. The pruner of claim 1, wherein: the diameter of the first gear is smaller than the diameter of the second gear.

5. The pruner of claim 1, wherein: the both ends of the relative setting of second gear are equipped with the eccentric wheel portion respectively, power transmission subassembly still establishes two including establishing respectively two crank levers on the eccentric wheel portion, and two a pot head of crank lever is established on the eccentric wheel portion, the other end with the sword strip subassembly links to each other.

6. The pruner of claim 5, wherein: in the direction of the central axis of the second gear, the central axes of the two eccentric wheel parts are not overlapped, one ends of the two crank rods corresponding to the eccentric wheel parts are not overlapped in the center, and the other ends of the two crank rods connected with the cutter bar assembly are overlapped in the center.

7. The pruner of claim 1, wherein: the outer rotor motor further comprises an outer rotor sleeved on the output shaft and a casing sleeved outside the outer rotor and the output shaft, and an avoidance gap is formed between the outer rotor and the casing.

8. The pruner of claim 1, wherein: the power transmission assembly further comprises a bottom cover arranged at the bottom of the shell assembly, the bottom cover comprises a first bottom cover and a second bottom cover which are assembled and matched up and down, and an accommodating cavity formed between the first bottom cover and the second bottom cover, and the first gear and the second gear are accommodated in the accommodating cavity.

9. The pruner of claim 8, wherein: at least two radiating fins are formed on one side of the bottom cover close to the cutter bar assembly in an extending mode, and a radiating channel is formed between every two adjacent radiating fins.

10. The pruner of claim 9, wherein: the fan is accommodated in the bottom cover, a blowing chamber which fully covers the outer side of the fan is formed in the bottom cover, the blowing chamber is formed by surrounding two heat dissipation fins on the outermost side, one end of the heat dissipation channel is communicated with the blowing chamber, and the other end of the heat dissipation channel is communicated with the outside.

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