CN110603978A - pruning machine - Google Patents

Abstract

The invention provides a pruner which comprises a handle assembly, a power mechanism arranged at one end of the handle assembly and a cutter assembly connected with the power mechanism, wherein the power mechanism comprises a shell assembly, a motor accommodated in the shell assembly and a cover covering the outer side of the motor, the top of the shell assembly is provided with an air inlet, the top of the cover is closed, and the bottom of the cover is provided with a through hole, so that external air can enter the shell assembly through the air inlet and enter a motor chamber formed by the cover in a surrounding manner through the through hole. Compared with the prior art, the pruner has better heat dissipation effect, has waterproof and dustproof effects, and can work in rainy days and humid areas without affecting the performance of the whole pruner.

Description

pruning machine

technical field

The invention relates to garden tools, in particular to a pruning machine.

Background technique

An electric pruner is a device used to trim outdoor plants such as various bushes, hedges, and green plants. The electric pruning machine tends to generate a lot of heat during use, and is not suitable for long-term continuous work. Therefore, it is necessary to design a special ventilation structure to dissipate heat and cool down the motor, gearbox and PCB board of the pruning machine. However, sometimes workers may use the electric pruning machine in rainy days and humid areas in order to catch up with work. When the pruning machine encounters rainy weather or the electric pruning machine is used in a humid area when it is working, rainwater is easy to enter through the ventilation structure. PCB boards, motors and other components inside the machine may have problems such as short circuit or burn-in. At this time, the working hours may be affected, and the cost may be increased, so that the electric pruning machine cannot be used in cloudy or light rainy weather. In addition, wood chips and dust will be generated when the pruning machine is used. If the ventilation structure is not well designed, the wood chips and dust will enter the inside of the pruning machine through the ventilation structure, which will affect the operation of the motor.

In view of this, it is necessary to improve the existing ventilation structure to solve the above problems.

Contents of the invention

The purpose of the present invention is to provide a pruning machine, which not only has good heat dissipation effect, but also has waterproof and dustproof effects, and can work in rainy days and humid areas without affecting the performance of the whole machine.

To achieve the above object, the present invention provides a pruning machine, comprising a handle assembly, a power mechanism installed at one end of the handle assembly and a blade assembly connected to the power mechanism, the power mechanism includes a housing assembly, The motor housed in the housing assembly and the casing covering the outside of the motor, the top of the casing assembly is provided with an air inlet, the top of the casing is closed, and the bottom is provided with a through hole for the passage of external air The air inlet enters the interior of the casing assembly, and enters the motor room surrounded by the casing through the through hole.

As a further improvement of the present invention, the through hole is opened on a side of the casing away from the air inlet; the motor is an outer rotor motor.

As a further improvement of the present invention, the power mechanism further includes a power transmission assembly installed under the casing assembly, the power transmission assembly includes a bottom cover installed at the bottom of the casing assembly and a The fan inside, the fan is coaxially sleeved on the output shaft of the motor, so that when the motor drives the fan to rotate, the hot air in the motor room is discharged, and the external air is driven into the motor from the air inlet. the inside of the casing assembly, and enter the motor chamber through the through hole.

As a further improvement of the present invention, the bottom cover is formed with a blast chamber fully covering the fan and a heat dissipation channel located at the bottom of the blast chamber and communicating with the outside world, and the bottom of the housing assembly is provided with ventilation holes, The ventilation hole is used to communicate with the motor room and the blower room.

As a further improvement of the present invention, at least two heat dissipation fins are formed extending from the side of the bottom cover close to the blade assembly, and a heat dissipation channel is formed between two adjacent heat dissipation fins, and the blast chamber is composed of Two heat dissipation fins are formed around, one end of the heat dissipation channel communicates with the blast chamber, and the other end communicates with the outside.

As a further improvement of the present invention, the power transmission assembly further includes a first gear and a second gear that are installed on the bottom cover and mesh with each other, the first gear is coaxially sleeved on the output shaft of the motor, And the diameter of the first gear is smaller than the diameter of the second gear.

As a further improvement of the present invention, the housing assembly includes a top cover covering the motor, the air inlet is opened on the top of the top cover, and the air inlet faces to the side of the handle assembly.

As a further improvement of the present invention, the casing is accommodated in the top cover, and an extension wall between the air inlet and the casing is formed inside the top cover, and the extension wall extends from the top cover. The inner side wall of the top cover extends downward; preferably, the extension wall extends from top to bottom to a middle position of the casing without contacting the casing.

As a further improvement of the present invention, an airflow channel is formed between the extension wall and the casing, and a filter element is arranged in the airflow channel to filter the external air when it enters the airflow channel through the air inlet. Get rid of dust and moisture.

As a further improvement of the present invention, the housing assembly further includes a bracket located under the top cover, and a drain opening is opened at the bottom of the bracket, and the drain opening is connected to the output shaft of the motor in the extending direction. The air inlets are connected to each other.

The beneficial effects of the present invention are: the pruning machine of the present invention provides an air inlet on the top of the housing assembly, simultaneously closes the top of the casing and opens a through hole at the bottom, so that external air can enter the housing assembly through the air inlet Inside, and enter the motor chamber through the through hole, so that the pruning machine of the present invention not only has better heat dissipation effect, but also has waterproof and dustproof effects, and can work in rainy days and humid areas without affecting the performance of the whole machine.

Description of drawings

Fig. 1 is the three-dimensional structural diagram of pruning machine of the present invention.

Fig. 2 is an exploded view of the pruning machine shown in Fig. 1 .

FIG. 3 is an exploded view of the handle assembly of FIG. 2 .

Fig. 4 is an exploded view of the blade assembly in Fig. 2 .

Fig. 5 is a perspective view of the power mechanism in Fig. 2 .

Fig. 6 is a partially exploded view of the power mechanism shown in Fig. 5 .

FIG. 7 is an exploded view of the housing assembly of FIG. 6 .

FIG. 8 is another perspective exploded view of the housing assembly shown in FIG. 7 .

Fig. 9 is a sectional view of the power mechanism shown in Fig. 5 .

FIG. 10 is an exploded view of the power transmission assembly of FIG. 6 .

Fig. 11 is an exploded view of the bottom cover in Fig. 10 .

Fig. 12 is an exploded view of the power transmission assembly shown in Fig. 10 when it cooperates with the blade assembly.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

1 and 2, the present invention discloses a pruning machine 100, including a handle assembly 10, a power mechanism 20 installed at one end of the handle assembly 10, and a blade assembly connected to the power mechanism 20. 30.

2 and 3, the handle assembly 10 includes a main handle 11, a secondary handle 12 and a protective plate 13, the main handle 11 is a grippable handle structure with a cavity, the main knife switch, speed control Switches and the like are arranged on the main handle 11 for user operation. 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, which is convenient for the user to hold and start the protection safely. The protective plate 13 is integrated with the auxiliary handle 12 to play a protective role.

2 and 4, the blade assembly 30 includes a pair of shear blades 31 and a protective decorative plate 32, and a pair of shear blades 31 are detachably slidable with the power mechanism 20 to be powered The mechanism 20 is driven to carry out the shearing operation; the protective decorative plate 32 is fixedly arranged at the middle position of the shearing blades 31 and above the pair of shearing blades 31 .

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

5 to 12 and shown in conjunction with FIG. 2, the power mechanism 20 includes a housing assembly 21, a motor 22 accommodated in the housing assembly 21, a casing 24 covering the outside of the motor 22, and an installation The power transmission assembly 23 under the housing assembly 21 . A motor chamber 240 for accommodating the motor 22 is formed around the casing 24 . In this embodiment, the motor 22 is preferably an outer rotor motor.

The housing assembly 21 includes a top cover 211 covering the motor 22 and a bracket 212 below the top cover 211 . The top of the top cover 211 is provided with an air inlet 2110, the air inlet 2110 is opened on the top of the rear wall of the top cover 211, and the air inlet 2110 is opened toward the side of the handle assembly 10, so that the outside air The inside of the top cover 211 can be entered through the air inlet 2110 . Of course, the air inlet 2110 can also be provided at the top of other side walls of the top cover 211, or both the top of the side wall and the top of the rear wall of the top cover 211 are provided with an air inlet 2110. be restricted.

The casing 24 is accommodated in the top cover 211 and is located beside the air inlet 2110 , and an extension between the air inlet 2110 and the casing 24 is formed inside the top cover 211 . wall 25, and the extension wall 25 extends vertically downward from the inner side wall of the top cover 211; preferably, in this embodiment, the extension wall 25 extends from top to bottom to the middle position of the casing 24 And not in contact with the casing 24 ; that is, the extension wall 25 vertically extends downward from the inner sidewall of the top cover 211 to half the height of the casing 24 . Such arrangement makes an airflow passage 251 formed between the extension wall 25 and the casing 24, so that after external air enters through the air inlet 2110, it will flow into the formation formed by the casing 24 and the top cover 211 along the airflow passage 251. within the space. Of course, the extension height of the extension wall 25 is not limited thereto, as long as the extension wall 25 is not in contact with the casing 24 so as to form the air flow channel 251 between the extension wall 25 and the casing 24 .

The bottom of the bracket 212 is provided with a discharge port 2121 , and in the extending direction of the output shaft 221 of the motor 22 , the discharge port 2121 corresponds up and down with the air inlet 2110 and communicates with each other. In this way, when the outside air enters through the air inlet 2110, due to the blocking of the extension wall 25, the wood chips and dust with larger particle diameters will be discharged from the discharge port 2121, which has a better dustproof effect; When it is used in a region, after the liquid such as rainwater enters through the air inlet 2110 with the external air, it will also be discharged from the discharge port 2121 due to the blocking of the extension wall 25 and its own gravity, which has a better waterproof effect.

The airflow channel 251 is provided with a filter (not shown), used to filter out dust and water vapor with smaller particle size when the external air enters the airflow channel 251 through the air inlet 2110, so as to make clean and Dry external air continues to flow into the interior of the top cover 211 along the airflow channel 251 .

The top of the casing 24 is closed, the bottom is provided with a through hole 241, and the through hole 241 is provided with a plurality, so that after the outside air enters the inside of the top cover 211, it will flow between the casing 24 and the top cover 211 first. It flows between the top covers 211 and then enters the motor chamber 240 through the through hole 241 to cool down the motor 22 accommodated in the motor chamber 240 . In this embodiment, the casing 24 is an aluminum alloy casing, and the through hole 241 is opened on the side of the casing 24 away from the air inlet 2110; the bracket 212 is a magnesium alloy bracket, and the The motor 22 is preferably an external rotor motor.

The bracket 212 includes a first part 2121 for installing the motor 22 and a second part 2122 for installing the circuit board 27, the first part 2121 is arranged roughly in a disk shape, and the middle position of the first part 2121 is opened There is a socket 2123 through which the output shaft 221 of the power supply 22 passes. The motor 22 and the bottom of the casing 24 are limited and accommodated in the first part 2121 , and the bottom of the top cover 211 and the first part 2121 are assembled and fixed by screws 50 , but it should not be limited thereto.

The bottom of the first part 2121 is also provided with a ventilation hole 2124 for communicating the motor chamber 240 with the power transmission assembly 23 . The second part 2122 is disposed near the side of the handle assembly 10 and connected with the handle assembly 10 so as to accommodate the circuit board 27 . The circuit board 27 is housed in the second part 2122 and covered under the top cover 211 , so that its core components can be protected by the top cover 211 and the bracket 212 , and has the effect of waterproof and dustproof.

The power transmission assembly 23 is installed under the bracket 212, and includes a bottom cover 231 installed on the bottom of the bracket 212, a fan 230 accommodated in the bottom cover 231, and a first A gear 232 and a second gear 233 , at least two cooling fins 234 are formed on the side of the bottom cover 231 close to the blade assembly 30 , and a cooling channel 235 is formed between two adjacent cooling fins 234 .

The fan 230 is accommodated in the bottom cover 231 and coaxially sleeved on the output shaft 221 of the motor 22, so that when the output shaft 221 drives the fan 230 to rotate, the suction force of the fan 230 can be used The function is to discharge the hot air in the motor room 240 and drive the outside air into the top cover 211 from the air inlet 2110 , and enter the motor room 240 from the through hole 241 on the casing 24 .

A blowing chamber 236 completely covering the fan 230 and a cooling channel 237 located at the bottom of the blowing chamber 236 and communicating with the outside are formed on the side of the bottom cover 231 away from the blade assembly 30 . The blast chamber 236 can be formed by surrounding two cooling fins 234 on the outermost side and is arranged in a closed manner. One end of the heat dissipation channel 235 communicates with the blast chamber 236 and the other end communicates with the outside.

The fan 230 is a centrifugal fan, and the ventilation hole 2124 at the bottom of the bracket 212 is used to communicate with the motor chamber 240 and the blast chamber 236, so that when the fan 230 rotates, the motor chamber can be ventilated through the ventilation hole 2124. The heat in 240 is sucked into the blast chamber 236 , and then dissipated through the heat dissipation channels 237 and the heat dissipation channels 235 .

The heat dissipation channel 237 is opened on the end of the bottom cover 231 away from the blade assembly 30 , and in the width direction of the bottom cover 231 , the heat dissipation channel 237 extends in an arc shape; the blast chamber 236 The bottom of the bottom cover is also provided with an air vent 238 communicating with the outside world, and in the length direction of the bottom cover 231, the air vent 238 also extends in an arc shape. When the output shaft 221 of the motor 22 rotates, it can drive the fan 230 to rotate, and when the fan 230 rotates, a low-pressure area will be generated near it. At this time, the vent 238 can supplement the external cold air to it, and the internal hot air can be dissipated through heat dissipation. The slot 237 is discharged, which improves the heat dissipation effect.

In the present invention, the heat dissipation channel 237 and the air vent 238 are designed to connect the blast chamber 236 and the outside in the thickness direction of the bottom cover 231 , so as to make the heat dissipation effect better.

The bottom cover 231 includes a first bottom cover 2311 and a second bottom cover 2312 assembled up and down, and an accommodating cavity 2313 formed between the first bottom cover 2311 and the second bottom cover 2312. 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 the diameter of the second gear 233, so that when the motor 22 rotates, it can The output shaft 221 drives the first gear 232 to rotate, and then drives the second gear 233 to rotate.

Two opposite ends of the second gear 233 are respectively provided with eccentric wheel portions 2331 , and in the direction of the central axis of the second gear 233 , the central axes of the two eccentric wheel portions 2331 do not overlap. The power transmission assembly 23 also includes two crank rods 239 respectively sleeved on the two eccentric wheel parts 2331, one end of the two crank rods 239 is sleeved on the corresponding eccentric wheel part 2331, and the other end is connected to the knife. The bar assembly 30 is connected, so that when the second gear 233 rotates, it can drive the crank rod 239 to move, and then drive the knife bar assembly 30 to move back and forth to perform cutting operation. Preferably, one end of the two crank rods 239 connected to the eccentric wheel portion 2331 does not overlap at the center, and the other end connected to the blade assembly 30 overlaps at the center, so as to achieve the effect of stable power transmission.

In the present invention, the assembly between the first bottom cover 2311 and the second bottom cover 2312 is realized through cooperation of screws and screw holes; of course, in other embodiments, the first bottom cover 2311 can also be assembled and fixed in other ways. A bottom cover 2311 and a second bottom cover 2312 are not limited here. In addition, it can be understood that the rotational connection between the first gear 232 and the fan 230, and between the eccentric wheel portion 2331 of the second gear 233 and the crank rod 239 is realized through the bearing 40, which is a prior art, so it will not be described in detail. describe.

The blowing chamber 236 , the heat dissipation fins 234 and the heat dissipation channel 235 are all formed on a side of the first bottom cover 2311 facing the housing assembly 21 . Specifically, the heat dissipation fins 234 are formed on the first bottom cover 2311 and located on one side of the fan 230, one end of the heat dissipation channel 235 communicates with the blast chamber 236, and the other end communicates with the outside. In the same way, when the motor 22 rotates, the fan 230 rotates synchronously, and drives the air in the accommodating cavity 2313 to discharge outward along the heat dissipation channel 235. This process will take away the heat on the motor 22, the power transmission assembly 23 and the heat dissipation fins 234 , improving the heat dissipation efficiency of the pruning machine 100 of the present invention.

The heat dissipation and dust-proof process of the pruning machine 100 of the present invention can be summarized as follows: when the fan 230 rotates, suction will be generated, and under the suction of the fan 230, the heat in the motor room 240 will pass through the ventilation holes 2124 at the bottom of the bracket 212 Flow into the blast chamber 236, and then dissipate through the heat dissipation channel 237 and the heat dissipation channel 235; at the same time, the external air enters from the air inlet 2110, and due to the blocking of the extension wall 25, the wood chips and dust with larger particle sizes and rainwater will be discharged from the discharge port 2121, while the dust and water vapor with smaller particle size will be filtered out by the filter, so that the clean and dry external air continues to flow into the top cover 211 along the airflow channel 251; the external air enters the top cover 211 The inside will flow around the casing 24 until it enters the motor chamber 240 from the through hole 241 to take away the heat in the motor chamber 240 . Compared with the prior art, the pruning machine 100 of the present invention not only has better heat dissipation effect, but also has waterproof and dustproof effects.

To sum up, the pruning machine 100 of the present invention opens an air inlet 2110 on the top of the housing assembly 21, and simultaneously closes the top of the casing 24 and opens a through hole 241 at the bottom, so that external air can pass through the air inlet 2110 It enters the interior of the housing assembly 21 and enters the motor chamber 240 through the through hole 241, which not only has a good heat dissipation effect, but also has waterproof and dustproof effects, and can work in rainy days and humid areas without affecting the performance of the whole machine .

The above embodiments are only used to illustrate the technical solutions of the present invention without limitation. Although the present invention has been described in detail with reference to preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced. Without departing from the spirit and scope of the technical solution of the present invention.

Claims (10)

1. A pruning machine, comprising a handle assembly, a power mechanism installed at one end of the handle assembly, and a blade assembly connected to the power mechanism, characterized in that: the power mechanism includes a housing assembly, housed in the shell The motor in the body assembly and the casing covering the outside of the motor, the top of the casing assembly is provided with an air inlet, the top of the casing is closed, and the bottom is provided with a through hole so that external air can pass through the inlet. The tuyere enters the inside of the casing assembly, and enters the motor room surrounded by the casing through the through hole. 2. The pruning machine according to claim 1, characterized in that: the through hole is opened on a side of the casing away from the air inlet; and the motor is an outer rotor motor. 3. The pruning machine according to claim 1, wherein the power mechanism further comprises a power transmission assembly installed under the housing assembly, and the power transmission assembly includes a power transmission assembly installed at the bottom of the housing assembly. The bottom cover of the bottom cover and the fan accommodated in the bottom cover, the fan is coaxially sleeved on the output shaft of the motor, so as to discharge the hot air in the motor room when the motor drives the fan to rotate, The external air is driven into the interior of the shell assembly through the air inlet, and enters the motor chamber through the through hole. 4. The pruning machine according to claim 3, characterized in that: the bottom cover is formed with a blast chamber that fully covers the fan and a heat dissipation channel that is located at the bottom of the blast chamber and communicates with the outside world. A ventilation hole is opened on the bottom of the housing assembly, and the ventilation hole is used to communicate with the motor chamber and the blower chamber. 5. The pruning machine according to claim 4, characterized in that: at least two heat dissipation fins are formed on the side of the bottom cover close to the blade assembly, and a heat dissipation fin is formed between two adjacent heat dissipation fins. There is a heat dissipation passage, and the blast chamber is formed by surrounding two heat dissipation fins. One end of the heat dissipation passage communicates with the blast chamber, and the other end communicates with the outside world. 6. The pruning machine according to claim 3, wherein the power transmission assembly further comprises a first gear and a second gear which are mounted on the bottom cover and engage with each other, and the first gear is coaxially sleeved It is arranged on the output shaft of the motor, and the diameter of the first gear is smaller than that of the second gear. 7. The pruning machine according to claim 1, wherein the housing assembly includes a top cover covering the motor, the air inlet is opened on the top of the top cover, and the air inlet The air outlet faces to one side of the handle assembly. 8. The pruning machine according to claim 7, characterized in that: the cover is accommodated in the top cover, and the inside of the top cover is also formed between the air inlet and the cover. The extension wall extends downward from the inner side wall of the top cover. 9. The pruning machine according to claim 8, characterized in that: an airflow passage is formed between the extension wall and the casing, and a filter element is arranged in the airflow passage, so that when the external air passes through the When the air inlet enters the airflow channel, dust and water vapor are filtered out. 10. The pruning machine according to claim 7, characterized in that: the housing assembly further comprises a bracket positioned under the top cover, the bottom of the bracket is provided with a discharge port, and the output shaft of the motor In the extending direction, the discharge port communicates with the air intake port.