Protection structure of chain saw and chain saw

Abstract

The invention relates to the technical field of sawing equipment, and particularly discloses a chain saw protection structure which comprises a machine body, a cutting protection module and a mechanical brake protection module, the cutting protection module and the mechanical brake protection module are arranged in the machine body, the cutting protection module comprises a driving wheel, a driven wheel and a first elastic body, and the driving wheel can drive the driven wheel to rotate when rotating in a certain direction; when the cutting force borne by the chain wheel unit is larger than the force of the first elastic body, the driven wheel breaks away from transmission fit with the driving wheel. The mechanical brake protection module comprises a brake disc, a second elastic body, a shifting unit and a control unit; the shifting unit can overcome the force of the second elastic body to enable the brake disc not to make contact with the driven wheel when making contact with the brake disc, and when the shifting unit is separated from the brake disc, the second elastic body drives the brake disc to make contact with the driven wheel and enables the driven wheel to be separated from the driving wheel. Active and passive braking is achieved, meanwhile, motor operation is maintained, and rapid reuse is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of sawing equipment, in particular to a protective structure of a chain saw and a corresponding chain saw. Background Art

[0002] Conventional sawing equipment, such as chain saws, uses electric chain saws to drive a sprocket through a motor, and the sprocket drives a chain mounted on a guide plate to rotate to achieve cutting. During the chain saw cutting process, when encountering an overload situation, the motor or saw blade is easily damaged. Traditional chain saws can only control the machine to shut down when the current is too large through electronic components, or to shut down for protection when the user cuts vigorously. The switch needs to be turned on again before use, which is inconvenient. Moreover, the electronic components are under the control of the protection current. If the protection time is too short, it will cause damage to the electronic components or motor, affecting normal use. Summary of the Invention

[0003] The object of the present invention is to provide a protective structure for a chain saw to solve the problems raised in the above background technology.

[0004] To solve the above technical problems, the present invention is implemented through the following technical solutions: A chain saw protective structure includes a body, a cutting protection module and a mechanical brake protection module arranged in the body, wherein the cutting protection module includes: a driving wheel driven by a motor; A driven wheel that cooperates with the driving wheel to drive the sprocket unit to move; a first elastic body disposed between the driven wheel and the fuselage, the first elastic body being used to provide a force to press the driven wheel against the driving wheel; The driving wheel can drive the driven wheel to rotate when it rotates in a certain direction, and the driven wheel cannot rotate with the driving wheel when it rotates in other directions. When the cutting force applied to the sprocket unit is greater than the force of the first elastic body, the driven wheel is disengaged from the transmission cooperation with the driving wheel; The mechanical brake protection module includes: a brake disc capable of engaging with a driven wheel; a second elastic body disposed between the brake disc and the fuselage; A toggle unit that contacts and cooperates with the brake disc; A control unit that cooperates with the toggle unit, the control unit being used to control the toggle unit to contact or disengage the brake disc; When the toggle unit contacts the brake disc, it can overcome the force of the second elastic body so that the brake disc does not contact the driven wheel. When the toggle unit is separated from the brake disc, the second elastic body drives the brake disc to contact the driven wheel and separates the driven wheel from the driving wheel.

[0005] Furthermore, a connecting shaft is provided on the driven wheel, and the sprocket unit is sleeved on the connecting shaft.

[0006] Furthermore, a third elastic body is provided between the connecting shaft and the sprocket unit.

[0007] Furthermore, the body includes an outer shell and a first bracket and a second bracket located inside the outer shell, the cutting protection module is arranged between the first bracket and the second bracket, the toggle unit is located between the driven wheel and the second bracket, the first elastomer is arranged between the driven wheel and the second bracket, and the second elastomer is arranged between the first bracket and the brake disc.

[0008] Furthermore, the driving wheel has a first tooth body, the driven wheel has a second tooth body, the first tooth body is engaged with the second tooth body, and the slope of one side surface of the second tooth body is greater than the slope of the other side surface.

[0009] Furthermore, the toggle unit includes an arc-shaped paddle, an extension plate is provided on the arc-shaped paddle, a positioning plate and a contact block are protruding from the extension plate, a fourth elastic body is provided between the positioning plate and the second bracket, and the side of the arc-shaped paddle that contacts the brake disc is a slope.

[0010] Furthermore, the control unit includes an operating panel, which is rotatably connected to the outer casing through a rotating block, and the rotating block is rotatably connected to the push rod through a connecting rod. A tension spring is provided between one end of the push rod and the body. During the rotation process, the other end of the push rod can abut against the contact block and cause the toggle unit to abut against the brake disc.

[0011] Furthermore, an electronic brake protection module is included, which includes a touch switch. The touch switch is located on the movement path of the control unit, and the touch switch controls the motor to stop after being triggered by the control unit.

[0012] Furthermore, the electronic brake protection module and the mechanical brake protection module can operate simultaneously or independently.

[0013] And, a chain saw comprising the protective structure.

[0014] The present invention has the following beneficial effects: The present invention realizes active and passive braking through the linkage cooperation of the cutting protection module and the mechanical brake protection module, while maintaining the operation of the motor, facilitating rapid reuse, and realizing overload protection for components such as the motor.

[0015] The present invention utilizes the structure of the mechanical brake protection module to enable the driven wheel to be separated from the driving wheel while the vehicle is stopped, thereby completing the disconnection of the transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 Schematic cross-sectional view of the position of the cutting protection module in the chain saw of Example 1; Figure 2 for Figure 1 A partially enlarged schematic diagram of Figure 3 Schematic cross-section of the mechanical brake protection module in the chain saw of Example 1; Figure 4 for Figure 3 Schematic diagram of the control unit in the unbraking state; Figure 5 for Figure 3 Schematic diagram of the control unit in the braking state; Figure 6 for Figure 3 A schematic diagram of the toggle unit in an unbraked state; Figure 7 for Figure 3 A schematic diagram of the toggle unit in a braking state; Figure 8 Schematic diagram of the explosion of the chain saw of Example 1; Figure 9 for Figure 8 Schematic diagram of the coordination between the driving wheel and the driven wheel; Figure 10 for Figure 8 A partially enlarged schematic diagram of the control unit; Figure 11 for Figure 8 Enlarged schematic diagram of the middle toggle unit.

[0018] Reference numerals 10 fuselage 101 First Elastomer 102 second elastic body 103 third elastic body 104 fourth elastic body 11 First Bracket 12 Second bracket 13 outer casing 20 driving wheel 21 first tooth 30 driven wheel 301 connecting shaft 31 Second tooth 40 sprocket unit 50 brake disc 60 toggle units 61 curved picks 62 extension plate 63 positioning plate 64 contact blocks 70 control unit 71 operation panel 72 rotating blocks 73 putters 74 connecting rod 75 tension spring 80 motor. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] Example 1 The chainsaw in this embodiment is an electric chainsaw structure, and its main body is composed of a motor, a body 10, a saw blade and other components. The body 10 is generally composed of an outer shell 13 and a first bracket 11 and a second bracket 12 located inside the outer shell 13, and a cutting protection module, a mechanical brake protection module and an electronic brake protection module are correspondingly provided therein.

[0021] Specifically, such as Figure 1 、 Figure 2 、 Figure 8 、 Figure 9 As shown, the cutting protection module includes a driving wheel 20 driven by a motor 80, a driven wheel 30 that cooperates with the driving wheel 20, and a first elastic body 101 arranged between the driven wheel 30 and the fuselage 10. The driven wheel 30 is used to drive the sprocket unit 40 to move, and the first elastic body 101 is used to provide a force to press the driven wheel 30 against the driving wheel 20.

[0022] The driven wheel 30 is provided with a connecting shaft 301 , and the sprocket unit 40 is sleeved on the connecting shaft 301 . The sprocket unit 40 is assembled and connected with components such as a saw blade to realize the operation of the cutting and sawing part.

[0023] The cutting protection module is disposed between the first bracket 11 and the second bracket 12 , and the first elastic body 101 is disposed between the driven wheel 30 and the second bracket 12 .

[0024] Among them, the driving wheel 20 has a first tooth body 21, and the driven wheel 30 has a second tooth body 31. The first tooth body 21 is engaged with the second tooth body 31. The slope of one side of the second tooth body 31 is greater than the slope of the other side. The side with a larger slope can normally cooperate with the first tooth body 21, and the side with a smaller slope cannot be effectively transmitted by the first tooth body 21. Therefore, the driving wheel 20 can only drive the driven wheel 30 to rotate when it rotates in a certain direction, such as clockwise. When the driving wheel 20 rotates in other directions, such as counterclockwise, the driven wheel 30 cannot rotate with the driving wheel 20, which protects the motor and the user and reminds the manufacturer that the motor setting is incorrect and the motor needs to be rotated and replaced.

[0025] Moreover, when the cutting force applied to the sprocket unit 40 is greater than the force of the first elastic body 101, the driven wheel 30 disengages from the transmission cooperation with the driving wheel 20. That is, due to the inclination and the setting of the first elastic body 101, the driven wheel 30 slips off the driving wheel 20 when the load is too large, and effective transmission cannot be achieved.

[0026] Furthermore, a third elastic body 103 is provided between the connecting shaft 301 and the sprocket unit 40 , so that when the driven wheel 30 is adjusted in the axial direction, the position of the sprocket unit 40 can remain unchanged.

[0027] Combine Figure 3-Figure 10 The mechanical brake protection module includes a brake disc 50 that can be in contact with the driven wheel 30, a second elastic body 102 arranged between the brake disc 50 and the fuselage 10, a toggle unit 60 that is in contact with the brake disc 50, and a control unit 70 that is linked with the toggle unit 60.

[0028] The shifting unit 60 is located between the driven wheel 30 and the second bracket 12 , and the second elastic body 102 is disposed between the first bracket 11 and the brake disc 50 .

[0029] The toggle unit 60 includes an arc-shaped paddle 61, on which an extension plate 62 is provided. A positioning plate 63 and a contact block 64 are protruding from the extension plate 62. A fourth elastic body 104 is provided between the positioning plate 63 and the second bracket 12. The contact surface of the arc-shaped paddle 61 with the brake disc 50 is an inclined surface, forming a wedge-shaped transmission structure.

[0030] In addition, the control unit 70 is used to control the toggle unit 60 to contact or disengage from the brake disc 50. The control unit 70 includes an operating panel 71, which is rotatably connected to the outer housing 13 via a rotating block 72. The rotating block 72 and the push rod 73 are rotatably connected via a connecting rod 74. A tension spring 75 is provided between one end of the push rod 73 and the body 10. During the rotation process, the other end of the push rod 73 can abut against the contact block 64 and make the toggle unit 60 abut against the brake disc 50. The contact position between the contact block 64 and the push rod 73 can also be an inclined surface to form a wedge-shaped transmission structure, that is, the rotational motion of the push rod 73 is converted into the linear motion of the toggle unit 60.

[0031] When the toggle unit 60 contacts the brake disc 50, it can overcome the force of the second elastic body 102 so that the brake disc 50 does not contact the driven wheel 30. When the toggle unit 60 is separated from the brake disc 50, the second elastic body 102 drives the brake disc 50 to contact the driven wheel 30 and causes the driven wheel 30 to separate from the driving wheel 20.

[0032] like Figure 3 The yellow figure shows the position of the push rod 73 and the arc-shaped paddle 61 in the braking state, and the red figure shows the position of the push rod 73 and the arc-shaped paddle 61 in the unbraking state. When the brakes are needed, the operating plate 71 is toggled to drive the rotating block 72 to rotate, and then the connecting rod 74 is rotated, and then the push rod 73 is rotated. The tension spring is in a tensioned state, the push rod 73 disengages from the contact block 64, and the arc-shaped paddle 61 is instantly disengaged from the brake disc 50 under the action of the fourth elastic body 104. The brake disc 50 is instantly pressed against the driven wheel 30 under the action of the second elastic body 102 for braking. At the same time, the brake disc 50 continues to push the driven wheel 30 under the action of the second elastic body 102 to overcome the elastic force of the first elastic body 101 and retreat from the driving wheel 20, thereby releasing the transmission cooperation.

[0033] In addition, the electronic brake protection module includes a touch switch, which is located on the movement path of the control unit 70. After the touch switch is triggered by the control unit 70, the motor 80 is controlled to stop. Here, the electronic brake protection module and the mechanical brake protection module can operate simultaneously or separately. When operating simultaneously, when the operating panel 71 is covered and the brake is applied, the mechanical brake protection module and the electronic brake protection module can operate simultaneously. The brake disc 50 limits the rotation of the driven wheel 30 and drives it away from the driving wheel 20, realizing the emergency stop of the chain saw. At the same time, after the touch switch is closed by the operating panel 71, the electronic brake logic is triggered, and the corresponding electronic component outputs a signal to control the motor 80 to stop, also realizing the emergency stop of the chain saw, and realizing double brake protection.

[0034] It should be noted that the first elastic body 101 , the second elastic body 102 , the third elastic body 103 , and the fourth elastic body 104 may all be springs.

[0035] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the content of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A chain saw protective structure, comprising a body, a cutting protection module disposed within the body, and a mechanical brake protection module, wherein the cutting protection module comprises: a driving wheel driven by a motor; A driven wheel that cooperates with the driving wheel to drive the sprocket unit to move; a first elastic body disposed between the driven wheel and the fuselage, the first elastic body being used to provide a force to press the driven wheel against the driving wheel; The driving wheel can drive the driven wheel to rotate when it rotates in a certain direction, and the driven wheel cannot rotate with the driving wheel when it rotates in other directions. When the cutting force applied to the sprocket unit is greater than the force of the first elastic body, the driven wheel is disengaged from the transmission cooperation with the driving wheel; The mechanical brake protection module includes: a brake disc capable of engaging with a driven wheel; a second elastic body disposed between the brake disc and the fuselage; A toggle unit that contacts and cooperates with the brake disc; A control unit that cooperates with the toggle unit, the control unit being used to control the toggle unit to contact or disengage the brake disc; When the toggle unit contacts the brake disc, it can overcome the force of the second elastic body so that the brake disc does not contact the driven wheel. When the toggle unit is separated from the brake disc, the second elastic body drives the brake disc to contact the driven wheel and separates the driven wheel from the driving wheel.

2. The protective structure for a chain saw according to claim 1, characterized in that: The driven wheel is provided with a connecting shaft, and the sprocket unit is sleeved on the connecting shaft.

3. The protective structure for a chain saw according to claim 2, characterized in that: A third elastic body is provided between the connecting shaft and the sprocket unit.

4. The protective structure for a chain saw according to claim 1, characterized in that: The body includes an outer shell and a first bracket and a second bracket located inside the outer shell. The cutting protection module is arranged between the first bracket and the second bracket. The toggle unit is located between the driven wheel and the second bracket. The first elastomer is arranged between the driven wheel and the second bracket. The second elastomer is arranged between the first bracket and the brake disc.

5. The protective structure for a chain saw according to claim 1, characterized in that: The driving wheel has a first tooth body, and the driven wheel has a second tooth body. The first tooth body is engaged with the second tooth body, and the slope of one side surface of the second tooth body is greater than the slope of the other side surface.

6. The protective structure for a chain saw according to claim 4, characterized in that: The toggle unit includes an arc-shaped paddle, an extension plate is provided on the arc-shaped paddle, a positioning plate and a contact block are protruding from the extension plate, a fourth elastic body is provided between the positioning plate and the second bracket, and the surface of the arc-shaped paddle that contacts the brake disc is an inclined surface.

7. The protective structure for a chain saw according to claim 6, characterized in that: The control unit includes an operating panel, which is rotatably connected to the outer casing via a rotating block. The rotating block is rotatably connected to the push rod via a connecting rod. A tension spring is provided between one end of the push rod and the body. During the rotation process, the other end of the push rod can abut against the contact block and cause the toggle unit to abut against the brake disc.

8. The protective structure for a chain saw according to claim 1, characterized in that: It also includes an electronic brake protection module, which includes a touch switch. The touch switch is located on the movement path of the control unit. After the touch switch is triggered by the control unit, it controls the motor to stop rotating.

9. The protective structure for a chain saw according to claim 8, characterized in that: The electronic brake protection module and the mechanical brake protection module can operate simultaneously or independently.

10. A chain saw, characterized in that: A protective structure for a chainsaw comprising the structure described in any one of claims 1 to 8.

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