CN219234887U - Abrasive belt machine - Google Patents

Abstract

The utility model relates to a belt sander, which comprises an execution unit; the execution unit includes: an execution body; the support assembly comprises a support arm movably arranged on the execution main body; the support arm is movable to switch between an operative position and a retracted position; the driving roller is rotatably arranged on the execution main body and is positioned at one side of the proximal end of the supporting arm; the driven roller is rotatably arranged at the far end of the supporting arm; the operating mechanism comprises a first operating button rotatably arranged on the executing main body and a second operating button rotatably arranged on the first operating button; the first operation button can rotate to drive the supporting arm to move to the contraction position towards the proximal end; the second operation button can rotate to drive the support arm to rotate; the rotation axis of the supporting arm is perpendicular to the rotation axis of the driving roller; the rotation axis of the support arm is perpendicular to the movement direction of the support arm. Above-mentioned abrasive band machine, the second operation button is located on the first operation button, avoids carrying out the space occupation of main part, and the structure is simpler.

Description

Abrasive belt machine

Technical Field

The utility model relates to the field of machining, in particular to a belt sander.

Background

The abrasive belt machine is an automatic tool for grinding, polishing and other operations, can effectively reduce labor intensity and improve work efficiency. The belt sander comprises an execution unit. In order to make it easier to adjust or change the sanding belt, the position of the sanding belt is often adjusted from different angles in different ways, and correspondingly, the execution unit is also provided with a plurality of operation buttons. However, the number of operating buttons is large, which results in a complex structure of the actuating unit of the belt sander.

Disclosure of Invention

Problems to be solved by the utility model

Aiming at the problem that the execution unit of the belt sander is complex in structure due to the fact that the operation buttons are more, the belt sander with the simpler structure is provided on the premise that the belt sander is convenient to adjust or replace.

Solution for solving the problem

A belt sander comprises an execution unit;

the execution unit includes:

an execution body;

the support assembly comprises a support arm movably arranged on the execution body; the support arm being movable to switch between an operative position and a retracted position;

the driving roller is rotatably arranged on the execution main body and is positioned at one side of the proximal end of the supporting arm;

the driven roller is rotatably arranged at the far end of the supporting arm;

the operating mechanism comprises a first operating button rotatably arranged on the executing main body and a second operating button rotatably arranged on the first operating button; the first operation button can rotate to drive the supporting arm to move to a retracted position; the second operation button can rotate to drive the support arm to rotate; the rotation axis of the supporting arm is perpendicular to the rotation axis of the driving roller; the rotation axis of the support arm is perpendicular to the movement direction of the support arm.

Optionally, the support assembly further comprises a support rail provided on the execution body, along which the support arm is movable.

Optionally, the second operation knob rotates to drive the support rail to rotate; the support rail rotates to drive the support arm to rotate.

Optionally, the execution unit further includes a rotating shaft disposed on the execution body; the distal end of the support rail has a rotation hole matched with the rotation shaft.

Optionally, an elastic element is provided between the proximal end of the support rail and the actuating body.

Optionally, the second operating knob is in threaded connection with the support rail, and a position where the second operating knob is connected with the support rail is deviated from a rotation axis of the support rail.

Optionally, the first operation button is provided with an avoidance hole; the second operation button comprises a second operation part, a connecting part inserted in the avoidance hole and a threaded part; the second operation part is fixedly connected with the threaded part through the connecting part.

Optionally, the axis of rotation of the first operating knob is collinear with the axis of rotation of the second operating knob.

Optionally, the first operation button is configured to: a cylindrical recess is provided around the rotation axis of the first operation knob, the second operation portion of the second operation knob is provided in the cylindrical recess, and the cylindrical recess provides a rotation space of the second operation portion.

Optionally, a seventh limiting part is arranged on the execution main body; an eighth limiting part is arranged on the supporting rail; the seventh limiting part is matched with the eighth limiting part so as to limit the position of the support rail along the first direction; the first direction is perpendicular to the transmission direction of the driving roller and the driven roller, and the first direction is perpendicular to the rotation axis direction of the driven roller.

Optionally, the seventh limiting part is a limiting column, and the eighth limiting part is a limiting groove parallel to the transmission direction of the driving roller and the driven roller; the seventh limiting part is at least partially inserted into the eighth limiting part.

Optionally, the execution unit further comprises an adjustment assembly including a reset piece and a shrinkage adjustment piece; the reset member is configured to: providing a return force for the support arm to return to an operating position; the contraction adjusting piece is movably arranged on the execution main body;

a convex part matched with the contraction adjusting piece is arranged on the inner side of the first operation button; the first operation button is configured to: when the first operation button rotates, the protrusion drives the contraction adjusting piece to move so as to drive the supporting arm to overcome the restoring force of the restoring piece to move to the contraction position towards the proximal end.

Optionally, a fourth limiting part matched with the shrinkage adjusting piece is arranged on the convex part; the fourth limit portion is configured to: and when the first operation button rotates to drive the supporting arm to be positioned at the contracted position, the contraction adjusting piece is limited to continue to move.

Optionally, the fourth limiting portion is a limiting groove, and the shrinkage adjusting piece is inserted into the fourth limiting portion under the action of the resetting piece.

Optionally, along the circumference of the protruding portion, the side walls on two sides of the fourth limiting portion are inclined, and the free ends of the side walls are inclined outwards.

Optionally, the contraction adjusting member is movably provided on the execution body.

Optionally, a guide part for guiding the movement of the shrinkage adjusting member is arranged on the support rail.

Optionally, the guide portion is configured to guide the movement of the shrinkage adjustment member in a direction in which the support arm moves.

Optionally, the guiding part is a guiding groove, and the shrinkage adjusting part is partially inserted into the guiding part.

Optionally, a fifth limiting part is arranged on the support rail, and a sixth limiting part is arranged on the support arm; the fifth limit part and the sixth limit part are matched to limit the support arm to continuously move distally when the support arm moves to the working position.

Optionally, the fifth limiting part is a limiting column, a limiting groove is formed in the supporting arm, and the fifth limiting part is at least partially inserted into the limiting groove; the sixth limiting part is the inner side wall of the proximal end of the limiting groove.

Optionally, the first operation button is provided with at least two protruding parts which are adjacent end to end in sequence, and the protruding parts which are adjacent end to end in sequence are arranged around the outer wall of the avoidance hole of the first operation button.

Optionally, the protruding portion is located on a face of the first operation button facing the support arm.

Optionally, the first operation button is further provided with an operation indication part, and the operation indication part is located at the periphery of the first operation button.

Optionally, the belt sander further comprises a driving mechanism for driving the execution unit; the execution body is provided with a containing cavity, and the containing cavity is provided with a first opening; the first opening is positioned on one side of the execution body away from the driving mechanism;

the execution unit further comprises a safety protection plate fixedly arranged at the first opening; the safety protection plate is used for covering the proximal end of the abrasive belt, the area surrounded by the proximal end of the abrasive belt and the area outside the proximal end of the abrasive belt, and the distance between the projection of the proximal end of the abrasive belt on the safety protection plate and the edge of the safety protection plate is larger than zero.

ADVANTAGEOUS EFFECTS OF INVENTION

Above-mentioned abrasive band machine, the second operation button is located on the first operation button, avoids carrying out the space occupation of main part for the structure of carrying out the main part is simpler. I.e. the structure of the execution unit is made simpler.

Drawings

Fig. 1 is a schematic structural diagram of a belt sander according to an embodiment of the present disclosure.

Fig. 2 is a schematic diagram of the execution unit in fig. 1.

Fig. 3 is a schematic view of the structure of the lock button in fig. 1.

Fig. 4 is a schematic view of the position of the lock button in the locked state.

Fig. 5 is a schematic view of the position of the lock button in the unlocked state.

Fig. 6 is a schematic diagram showing a matching relationship between the locking portion and the locking notch when the locking button is in the locked state.

Fig. 7 is a schematic structural view of the main body in fig. 1.

Fig. 8 is an enlarged schematic view of the structure of M in fig. 7.

Fig. 9 is a schematic view of a structure for preventing the locking portion of the locking knob from coming out of the locking notch.

FIG. 10 is a schematic view of the actuator unit in a first extreme locked position.

Fig. 11 is a schematic structural view of the execution unit in the second limit locking position.

Fig. 12 is a schematic structural view of the execution unit in the third pole limit locking position.

Fig. 13 is a schematic structural view of the locking button abutting against the first limiting portion.

Fig. 14 is a schematic structural view of the locking button abutting against the second limiting portion.

FIG. 15 is a schematic cross-sectional view of an actuator unit.

Fig. 16 is a schematic view of the first operating button in fig. 15.

Fig. 17 is a schematic structural view of the first operation knob matched with the contraction adjustment key.

Fig. 18 is a schematic view of the structure of the support arm in the retracted position.

FIG. 19 is a schematic view of the relative positions of the support rail and the adjustment assembly.

FIG. 20 is a schematic view of the relative positions of the support arm and the adjustment assembly.

Fig. 21 is a schematic view of the structure after the second operation knob is rotated to rotate the support arm.

Fig. 22 is an enlarged view of P in fig. 15.

Fig. 23 is a Q-Q cross-sectional view of the execution unit of fig. 15.

Description of the reference numerals

110. A main body; 111. an accommodating space; 112. a mounting surface;

120. an execution unit; 121. a locking notch; 121a, a first locking notch; 121b, a second locking notch; 121c, a third locking notch; 121d, a fourth locking notch; 122. a spacer; 123a, a first limit part; 123b, a second limiting part; 124. a turntable; 124a, working area; 124b, non-working area; 125. an execution body; 125a, a seventh limit part; 125b, a receiving cavity; 125c, a first opening; 126. a support assembly; 126a, support arms; 126b, support rails; 126c, a guide; 126d, track grooves; 126e, a fifth limiting part; 126f, a sixth limiting part; 126g, limit groove; 126j, guide channels; 126k, eighth limit part; 126m, turning holes; 127. a drive roll; 128. driven roller; 129. an adjustment assembly; 129a, a second reset member; 129b, a shrinkage adjuster; 1210. an operating mechanism; 1210a, a first operation button; 1210b, a protrusion; 1210c, a fourth limiting portion; 1210d, an operation instruction unit; 1210e, a second operation button; 1210f, relief holes; 1210g, a second operation portion; 1210h, a connection; 1210j, a threaded portion; 1210k, cylindrical recess; 1211. abrasive belt; 1212. a rotating shaft; 1213. an elastic member; 1214. a safety protection plate;

130. A locking assembly; 131. a lock button; 131a, a locking part; 131b, an anti-falling part; 131c, a first operation part; 131d, avoiding space; 132. a first reset member;

150. a driving unit;

160. a handle;

170. and a secondary handle.

Detailed Description

In order to make the technical scheme and the beneficial effects of the utility model more obvious and understandable, the following detailed description is given by way of example. Wherein the drawings are not necessarily to scale, and wherein local features may be exaggerated or reduced to more clearly show details of the local features; unless defined otherwise, technical and scientific terms used herein have the same meaning as technical and scientific terms in the technical field to which this application belongs.

In the description of the present utility model, the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. refer to the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are merely for convenience of simplifying the description of the present utility model, and do not indicate that the apparatus or element referred to must have a specific orientation, be constructed and operated in a specific orientation, i.e., are not to be construed as limiting the present utility model.

In the present utility model, the terms "first", "second" are used for descriptive purposes only and are not to be construed as relative importance of the features indicated or the number of technical features indicated. Thus, a feature defining "first", "second" may explicitly include at least one such feature. In the description of the present utility model, "plurality" means at least two, for example, two, three, etc.; "plurality" means at least one, such as one, two, three, etc.; unless otherwise specifically defined.

In the present utility model, the terms "mounted," "connected," "secured," "disposed," and the like are to be construed broadly, unless otherwise specifically limited. For example, "connected" may be either fixedly connected or detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, or can be communicated between two elements or the interaction relationship between the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless explicitly defined otherwise, a first feature "on", "above", "over" and "above", "below" or "under" a second feature may be that the first feature and the second feature are in direct contact, or that the first feature and the second feature are in indirect contact via an intermediary. Moreover, a first feature "above," "over" and "on" a second feature may be that the first feature is directly above or obliquely above the second feature, or simply indicates that the level of the first feature is higher than the level of the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the level of the first feature is less than the level of the second feature.

As shown in fig. 1 to 23, the belt sander according to an embodiment of the present application includes a main body 110, an executing unit 120, and a locking assembly 130.

The execution unit 120 is rotatably connected with the main body 110. The proximal end of the actuator unit 120 has a number of locking notches 121, the number of locking notches 121 being arranged around the rotational axis m of the actuator unit 120, see fig. 1 and 2.

Referring to fig. 1 to 6, the locking assembly 130 includes a locking knob 131 movably provided on the main body 110. The locking knob 131 has a locking portion 131a that mates with the locking notch 121. The lock button 131 is movable to switch between a locked state and an unlocked state. When the locking button 131 is in the locked state, the locking portion 131a of the locking button 131 is inserted into one of the locking notches 121 to lock the execution unit 120, and limit the rotation of the execution unit 120 relative to the main body 110, so as to achieve the relative fixation of the execution unit 120 and the main body 110, as shown in fig. 4. When the locking button 131 is in the unlocked state, the locking portion 131a of the locking button 131 is deviated from all the locking notches 121 to unlock the execution unit 120, so that the execution unit 120 can rotate relative to the main body 110, and the angle of the execution unit 120 can be adjusted conveniently, see fig. 5. Therefore, the rotation operation of the execution unit 120 can be quickly realized by the operation of the locking button 131, and the operation is simple.

In addition, after the position of the execution unit 120 is adjusted, the locking portion 131a of the locking button 131 is inserted into the locking notch 121 of the execution unit 120, so as to lock the execution unit 120 and the main body 110, thereby better maintaining the stability of the belt sander.

It will be appreciated that the locking knob 131, when in the locked state, secures the execution unit 120 relative to the main body 110, and the locking knob 131 remains secured relative to the main body 110.

Referring to fig. 2, 3 and 6, the locking notch 121 has a U-shape, and the locking portion 131a has a substantially rectangular parallelepiped shape. In the locked state of the lock knob 131, three side surfaces of the lock portion 131a are respectively abutted against three side surfaces of the lock notch 121, so that the lock knob 131 and the side wall of the lock notch 121 remain fixed, and thus the main body 110 and the execution unit 120 remain fixed. Of course, it is understood that the locking notch 121 is not limited to a U-shape, and may take any other regular or irregular shape, so as to ensure that the locking portion 131a matches the locking notch 121, and further, the main body 110 and the execution unit 120 remain fixed when the locking button 131 is in the locked state.

Referring to fig. 4 and 5, the locking assembly 130 further includes a first reset element 132. The first reset member 132 is configured to apply a reset force to the lock button 131 that moves to the locked state. In other words, when the locking button 131 is in the unlocked state, the first reset member 132 applies a reset force to the locking button 131, so that the locking button 131 can be moved to the locked state by the reset force of the first reset member 132.

Optionally, when the locking button 131 is in the locked state, the first reset element 132 provides a holding force for holding the locking button 131 in the locked state, so that the locking button 131 is more stably held in the locked state.

Referring to fig. 2, 4 and 5, the lock knob 131 is movable to switch between a locked state and an unlocked state; the direction of movement a-a of the locking knob 131 is parallel to the axis of rotation m of the actuator unit 120. It will be appreciated that in other possible embodiments, the direction of movement of the locking knob 131 is not limited to being parallel to the axis of rotation of the actuator unit 120, but may be in any other direction, such that the locking portion 131a of the locking knob 131 is inserted within the locking notch 121, or offset from the locking notch 121. Further, in another possible embodiment, the movement mode of the lock button 131 is not limited to movement, but may be rotation, and may be switched between a locked state and an unlocked state.

Referring to fig. 4, 5 and 8, the body 110 is provided with a receiving space 111 matched with the locking part 131 a. When the locking button 131 is in the unlocked state, the locking portion 131a is located in the accommodating space 111. Of course, it is understood that in other possible embodiments, the locking portion may also be partially located in the receiving space when the locking knob is in the unlocked state.

Fig. 4 and 5 show an embodiment of the first restoring member 132, and in particular, the first restoring member 132 is an elastic restoring member. More specifically, the first return member 132 is a return spring. Both ends of the first reset element 132 are respectively abutted with the main body 110 and the locking button 131. It will be appreciated that in other possible embodiments, the configuration of the reset member is not limited thereto, and the reset force may be applied to the lock button 131 to move to the locked state.

Referring to fig. 3 and 9, the locking knob 131 is provided with a release preventing portion 131b to prevent the locking portion 131a from being released from the locking notch 121 when the locking knob 131 is in the locked state.

Specifically, referring to fig. 9, the escape prevention part 131b is located at a side of the execution unit 120 near the main body 110. When the lock knob 131 is in the locked state, the anti-release portion 131b abuts against the execution unit 120. Further, the direction in which the anti-drop portion 131b abuts against the execution unit 120 is parallel to the movement direction when the lock knob 131 is shifted from the unlock state to the lock state. That is, at least one direction of the force of the actuator 120 against the drop-off preventing portion 131b is opposite to the direction of the restoring force given to the lock button 131 by the first restoring member 132. Thereby, when the lock knob 131 is pushed by the reset force of the first reset piece 132 to change from the unlocked state to the locked state, the lock knob 131 moves in the direction of the reset force until the escape prevention portion 131b abuts against the execution unit 120, and from this, the lock portion 131a is held in the lock notch 121 so that the lock knob 131 is held in the locked state.

Referring to fig. 2 to 6, in the actuator 120, a structure between adjacent locking notches 121 is a spacer 122. The lock knob 131 further has a first operation portion 131c and a relief space 131d that matches the spacer 122. The first operating portion 131c and the locking portion 131a are located at both sides of the escape space 131d. Alternatively, the first operating portion 131c and the locking portion 131a are separated by a space 131d. The first operating portion 131c is located at a side of the locking notch 121 away from the main body 110. That is, the first operating portion 131c is always maintained at a side of the locking notch 121 remote from the main body 110 such that the first operating portion 131c is always exposed to the outside, so that an operator can touch the first operating portion 131c at any time to change the state of the locking knob 131.

For ease of understanding, the locking and unlocking process of the locking assembly 130 is briefly described as follows: by operating the first operating portion 131c, the lock knob 131 is moved in the direction of the main body 110 to the point where the escape space 131d is located at a position corresponding to the lock notch 121 and the spacer 122, see fig. 5; the execution unit 120 rotates relative to the main body 110, so that the locking part 131a corresponds to the other locking notch 121; the external force of the first operating portion 131c is canceled, and the first operating portion 131c moves away from the main body 110 under the action of the first resetting member 132 until the locking portion 131a is inserted into the locking notch 121 and the anti-releasing portion 131b abuts against the execution unit 120, and the locking button 131 is in a locked state, as shown in fig. 11 and 12, and the execution unit 120 also completes the rotation relative to the main body 110.

Referring to fig. 4 to 7, a driving unit 150 is provided on the main body 110, and the execution unit 120 is rotatably connected with the driving unit 150. The locking knob 131 is movably provided on the driving unit 150. The job of the execution unit 120 is driven by the driving unit 150. The execution unit 120 is directly rotatably connected with the driving unit 150, so that the relative position of the execution unit 120 and the driving unit 150 can be better ensured, and the driving relationship between the driving unit 150 and the execution unit 120 can be better ensured.

Of course, it will be appreciated that in other possible embodiments, the locking button may be provided on other structures of the main body, so as to ensure that the driving unit may drive the execution unit to operate when the execution unit rotates to different positions.

Referring to fig. 2, 4-6, and 10-11, the plurality of locking notches 121 of the execution unit 120 includes a first locking notch 121a, a second locking notch 121b, and a plurality of third locking notches 121c located between the first locking notch 121a and the second locking notch 121 b. When the locking portion 131a of the locking button 131 is inserted into the first locking notch 121a, the execution unit 120 is located at the first limit locking position, see fig. 1, 4 to 6 and 10. When the locking portion 131a of the locking button 131 is inserted into the second locking notch 121b, the execution unit 120 is located at the second limit locking position, see fig. 11. The included angle between the first limit locking position and the second limit locking position is 60-90 degrees. It will be appreciated that the angle between the first limit locking position and the second limit locking position is the angle at which the actuator 120 rotates from the first limit locking position to the second limit locking position, and is the angle at which the actuator 120 rotates from the second limit locking position to the first limit locking position. The included angle is 60-90 degrees, so that the belt sander meets the general use requirement.

When the actuator 120 is in the first limit lock position, the extension direction of the actuator 120 is parallel to the direction in which the proximal end of the belt sander is directed distally, see in detail direction b-b in fig. 10.

Referring to fig. 2, 6, and 10 to 12, the plurality of locking notches 121 of the execution unit 120 further includes a fourth locking notch 121d. The second locking notch 121b is located between the first locking notch 121a and the fourth locking notch 121d. When the locking portion 131a of the locking button 131 is inserted into the fourth locking notch 121d, the execution unit 120 is located at the third limit locking position, see fig. 12. The third pole limiting locking position is set so that the belt sander has a larger application range.

Further, an included angle between the first limit locking position and the third limit locking position is 155-170 degrees. In particular to the embodiments shown in fig. 2, 6, 10-12, there is no further locking notch 121 between the second locking notch 121b and the fourth locking notch 121d. It is generally less common to rotate the actuator to the second and third extreme locking positions, and therefore, even if no other locking notch is provided between the second and fourth locking notches 121b and 121d, the basic use requirements can be satisfied, and the mechanical properties between the second and fourth locking notches 121b and 121d can be better ensured. It will be appreciated that in other embodiments, a locking notch 121 may also be provided between the second locking notch 121b and the fourth locking notch 121d.

Referring to fig. 2, 6, and 10 to 14, the proximal end of the execution unit 120 is provided with a first limiting portion 123a and a second limiting portion 123b. The main body 110 is provided with a third limiting portion matching the first limiting portion 123a and the second limiting portion 123b.

Along the rotation circumferential direction of the execution unit 120, a working area 124a is defined between the first limiting portion 123a and the second limiting portion 123b, and the third limiting portion is located in the working area 124a to define the rotation angle of the execution unit 120 relative to the main body 110. The first limiting portion 123a and the second limiting portion 123b may rotate along with the execution unit 120, but the third limiting portion is always located in the working area 124 a. In other words, when the execution unit 120 rotates until the first limiting portion 123a abuts against the third limiting portion, the execution unit 120 is limited to continue rotating; when the execution unit 120 rotates until the second limiting portion 123b abuts against the third limiting portion, the execution unit 120 is restricted from continuing to rotate. Therefore, the execution unit 120 can only rotate in the working area 124a defined by the first limiting part 123a and the second limiting part 123b, so that structures such as other operating buttons of the belt sander are prevented from being touched by mistake due to excessive rotation of the execution unit 120, further, the belt sander is prevented from being started by mistake, and other structures on the belt sander are prevented from being damaged due to impact of the execution unit 120. In addition, injuries to the operator due to a false touch to the operator caused by a large rotation of the actuator 120 are avoided.

Specifically, the first limiting portion 123a and the second limiting portion 123b are configured to cooperate with the third limiting portion, so that the third limiting portion is located between the first limiting portion 123a and the second limiting portion 123b to define a rotation angle of the execution unit 120 relative to the main body 110. In other words, along the rotation circumferential direction of the execution unit 120, the third limiting portion is always located between the first limiting portion 123a and the second limiting portion 123b to define the rotation range of the execution unit 120.

In order to avoid misoperation of an operation button on the belt sander, a safety lock structure is often arranged for the operation button which is likely to be misoperation, so that the operation button is prevented from being misoperation. In this application, the limiting of the rotation angle of the execution unit 120 prevents the execution unit 120 from being rotated excessively to touch other operation buttons by mistake. Therefore, a safety lock structure is not required to be arranged for other operation buttons, so that the structure of the belt sander is simplified.

Obviously, the locking notch 121 is located between the first limiting portion 123a and the second limiting portion 123b, i.e. within the working area 124 a.

In particular, in the embodiment shown in fig. 2, 6 and 10 to 14, the locking knob 131 is a third limiting portion. Specifically, referring to fig. 13, the first limiting portion 123a abuts against the lock knob 131, and limits the execution unit 120 from continuing to rotate in the counterclockwise direction in fig. 13, and for convenience of description, this position of the execution unit 120 will be referred to as a first limit rotation position. Of course, the execution unit 120 may swivel in a clockwise direction. Referring to fig. 14, the second limiting portion 123b abuts against the lock knob 131, and limits the execution unit 120 from continuing to rotate in the clockwise direction in fig. 14, and for convenience of description, this position of the execution unit 120 will be referred to as a second limit rotation position. Of course, the actuator 120 may also swivel in a counter-clockwise direction.

Optionally, the angle between the first limit rotation position and the second limit rotation position is 155 ° to 170 °. It is understood that the angle between the first limit rotation position and the second limit rotation position is an angle at which the actuator 120 rotates from the first limit rotation position to the second limit rotation position, and is also an angle at which the actuator 120 rotates from the second limit rotation position to the first limit rotation position.

It will be appreciated that in other possible embodiments, the third limit is not limited to the locking knob 131. A separate limit structure may be provided on the main body 110.

Referring to the embodiment shown in fig. 2, 6, and 10 to 14, the distance between the first limiting portion 123a and the first locking notch 121a is greater than zero, and the distance between the second limiting portion 123b and the fourth locking notch 121d is greater than zero. Thus, the side wall of the adjacent locking notch 121 is prevented from being damaged when the first limiting portion 123a abuts against the locking knob 131, and the side wall of the adjacent locking notch 121 is prevented from being damaged when the second limiting portion 123b abuts against the locking knob 131.

Of course, in another possible embodiment, the distance between the first limiting portion and the first locking notch may be equal to zero, and the distance between the second limiting portion and the fourth locking notch may be equal to zero. For example, the first limiting portion may be an outer side wall of the first locking notch, that is, a side wall of the first locking notch on a side away from the adjacent locking notch. Correspondingly, the structure of the third limiting part is correspondingly matched. It will be appreciated that the first stop portion needs to extend to be able to abut the locking knob, as compared to the side wall of the locking notch in the neutral position. Similarly, the second limiting portion may be a side wall of the fourth locking notch. The specific arrangement is the same as the first limiting portion, and will not be described here again.

Further, optionally, the first limit rotation position is a first limit locking position, and the second limit rotation position is a third limit locking position.

Referring to fig. 2, the proximal end of the execution unit 120 has a dial 124 rotatably coupled to the main body 110. The turntable 124 is divided circumferentially into a working area 124a and a non-working area 124b, specifically the area of the turntable selected by the dashed box in fig. 2. The first stopper 123a is located at one of the adjacent positions of the working area 124a and the non-working area 124b in the circumferential direction, and the second stopper 123b is located at the other of the adjacent positions of the working area 124a and the non-working area 124 b. The provision of the turntable 124 makes the rotational connection of the execution unit 120 with the main body 110 more stable. The first limiting portion 123a and the second limiting portion 123b are both disposed on the turntable 124, so that on one hand, when the first limiting portion 123a or the second limiting portion 123b abuts against the third limiting portion, damage to other structures on the execution unit 120 can be avoided; on the other hand, the limiting operation of the execution unit 120 can be realized without changing other structures on the execution unit 120.

In the embodiment shown in fig. 2, the locking knob 131 is located at a distance from the axis of rotation of the dial 124 that is less than the radius of the non-working area 124 b. Thus, when the actuator 120 is rotated until the lock knob 131 is located at any one of the adjacent positions of the working area 124a and the non-working area 124b, the actuator 120 is restricted from continuing to rotate, thereby avoiding that the lock knob 131 is located outside the working area.

Specifically, the radius of the working area 124a is smaller than the radius of the non-working area 124 b. The steps of the working area 124a and the non-working area 124b at two adjacent positions constitute a first limiting portion 123a and a second limiting portion 123b, respectively. Thus, the first limiting portion 123a and the second limiting portion 123b have better strength and have longer service life.

It will be appreciated that in other possible embodiments, the first and second stop portions may also be stop structures provided at the edge positions of the protruding turntable. Specifically, the first limiting part and the second limiting part can be integrally formed with the turntable, or are fixedly connected after being respectively formed.

As is evident, referring to fig. 2, 6, and 10-14, the locking notch 121 is also located at the peripheral edge of the working area 124a of the turntable 124. Therefore, the execution unit 120 can be more stably arranged on the main body 110 when locked, so as to ensure the stability of the operation of the execution unit 120.

Referring to fig. 6, the body 110 has a mounting face 112. The turntable 124 is disposed on the mounting surface 112. The locking knob 131 is provided on the mounting surface 112 and is located at the periphery of the turntable 124. Thus, the arrangement of the lock button 131 does not affect the rotation of the dial 124, and the probability of injuring the operator's hand pressing the lock button 131 by mistake when the execution unit 120 rotates can be reduced.

Furthermore, it is apparent that the mounting surface 112 has an area not covered by the turntable 124 in which the locking knob 131 is located. Therefore, when the operator presses the locking button 131, the operator can press the hand against the side surface of the main body 110 at the same time, so that the operator presses the locking button 131 more stably, and the risk of accidental injury of the operator can be reduced.

Referring to fig. 15 to 18, the execution unit 120 includes an execution body 125, a support assembly 126, a driving roller 127, a driven roller 128, an adjustment assembly 129, and an operation mechanism 1210.

The support assembly 126 includes a support arm 126a movably provided on the execution body 125. The support arm 126a is movable to switch between an operative position and a retracted position. The drive roller 127 is rotatably provided on the execution body 125 on the proximal end side of the support arm 126a. The driven roller 128 is rotatably provided at the distal end of the support arm 126a. When the belt sander works, the abrasive belt 1211 is sleeved on the driving roller 127 and the driven roller 128, and the abrasive belt 1211 is driven to rotate by the rotation of the driving roller 127 and the driven roller 128. The adjustment assembly 129 includes a second reset element 129a and a retraction adjustment element 129b. The second reset element 129a is configured to: providing a return force to return the support arm 126a to the operating position. Specifically, one end of the second restoring member 129a abuts the support arm 126a. The contraction adjusting member 129b is movably provided on the execution body 125. Specifically, the contraction adjusting member 129b is fixedly connected to the support arm 126a, so that the movement track of the contraction adjusting member 129b is identical to that of the support arm 126a. Thus, the retraction adjustment member 129b may be actuated to move the support arm 126a such that the support arm may be moved from the operative position to the retracted position. More specifically, the contraction adjustment member 129b is a bolt fixedly attached to the support arm 126a. Preferably, the bolts protrude from the surface of the support arm 126a. Further preferably, the axial direction of the bolt is perpendicular to the length direction of the support arm 126a. The operating mechanism 1210 includes a first operating knob 1210a rotatably provided on the execution body 125. The first operation knob 1210a is provided inside with a convex portion 1210b which matches the contraction adjusting member 129b. Specifically, the projection 1210b abuts the portion of the contraction adjustment member 129b protruding from the support arm 126a. The first operation button 1210a is configured to: when the first operation button 1210a rotates, the protrusion 1210b rotates along with the first operation button 1210a, and the rotation of the protrusion 1210b drives the contraction adjusting member 129b to move, so as to drive the support arm 126a fixedly connected to the contraction adjusting member 129b to move proximally to the contraction position against the restoring force of the second restoring member 129a, and the moving direction is specifically referred to the direction M in fig. 17. A schematic view of the support arm 126a in the operative position is shown in fig. 15 and 17, and a schematic view of the support arm 126a in the retracted position is shown in fig. 18. Obviously, when support arm 126a is in the retracted position, the distance between drive roller 127 and driven roller 128 is reduced, thereby facilitating installation and removal of abrasive belt 1211.

Rotation of first operating knob 1210a, through engagement of projection 1210b with retraction adjustment member 129b, drives support arm 126a to move to the retracted position against the restoring force of second restoring member 129a, thereby facilitating installation and removal of abrasive belt 1211.

In addition, the adjusting assembly 129 is provided with a second resetting element 129a, so that the supporting arm 126a can be reset and kept in the working position under the action of the second resetting element 129a when not being acted by the shrinkage adjusting element 129 b.

Referring to fig. 16 to 18, the protrusion 1210b is provided with a fourth stopper 1210c which is matched with the shrinkage adjuster 129 b. The fourth limiting portion 1210c is configured to: when the first operating knob 1210a is rotated to drive the support arm 126a to the retracted position, the retraction adjuster 129b is restricted from continuing to move, as best seen in fig. 18. Specifically, when first operation knob 1210a in fig. 17 is rotated clockwise to the position shown in fig. 18, fourth limiting portion 1210c cooperates with retraction adjuster 129b to limit continued clockwise rotation of first operation knob 1210a and thus continued movement of retraction adjuster 129b, thereby maintaining retraction adjuster 129b in the position shown in fig. 18, i.e., support arm 126a in the retracted position, facilitating installation and removal of abrasive belt 1211.

In addition, the fourth limiting portion 1210c is provided so that the operator can more easily perceive that the support arm 126a has moved and can be maintained at the retracted position, thereby stopping the operation of the first operation knob 1210 a.

Specifically, the fourth limiting portion 1210c is a limiting groove, and the shrinkage adjustment member 129b is inserted into the fourth limiting portion 1210c under the action of the second reset member 129 a. Specifically, when the shrinkage adjuster 129b moves to the fourth limiting portion 1210c of the protrusion 1210b under the action of the protrusion 1210b, the shrinkage adjuster 129b is inserted into or abuts against the fourth limiting portion 1210c under the action of the second reset member 129a, so as to maintain the position shown in fig. 18, i.e. maintain the support arm 126a in the shrinkage position. It is appreciated that the shrinkage adjuster 129b is now retained in the fourth limit 1210 c. The support arm 126a needs to be switched between the retracted position and the working position, so that the retraction adjusting member 129b limited by the fourth limiting portion 1210c is further separated from the limitation of the fourth limiting portion 1210c under the action of the external force, and further separated from the protruding portion 1210b, so that the support arm 126a can be moved to the working position under the action of the second restoring member 129 a.

More specifically, along the circumferential direction of the protruding portion 1210b, both side walls of the fourth limiting portion 1210c are inclined, and the free ends thereof are inclined outwards. Therefore, when the shrinkage adjusting member 129b is inserted into the fourth limiting portion 1210c, the shrinkage adjusting member 129b can be gradually inserted into the fourth limiting portion 1210c, so that the impact of the shrinkage adjusting member 129b on the side wall of the fourth limiting portion 1210c is reduced, the damage to the protruding portion 1210b is reduced, and the service life of the first operation button 1210a is prolonged.

In addition, the first operation button 1210a continues to rotate, and the shrinkage adjustment member 129b can be driven to slide from the fourth limiting portion 1210c against the restoring force of the second restoring member 129a, so that the shrinkage adjustment member 129b is separated from the limitation of the protrusion 1210b by the rotation of the first operation button 1210 a. When the shrinkage adjustment member 129b is separated from the limitation of the protrusion 1210b, no object is abutted against the shrinkage adjustment member 129b, so that the support arm 126a fixedly connected with the shrinkage adjustment member 129b can move to the working position under the action of the second reset member 129 a.

As is apparent from fig. 15 to 17, the projection 1210b is located on a side of the first operation knob 1210a facing the support arm 126 a.

Of course, it is understood that in another possible embodiment, the fourth limiting portion is not limited to the limiting groove, but may be a regular or irregular structure such as a limiting protrusion, and when the shrinkage adjustment member moves to a position matching with the fourth limiting portion, the shrinkage adjustment member can be kept at the position of the fourth limiting portion, so that the support arm can be kept at the shrinkage position.

The contraction adjusting member 129b is movably provided on the execution body 125. Further, the contraction adjustment member 129b is fixedly connected to the support arm 126 a. Thus, the support arm 126a is driven to move by the movement of the contraction adjustment member 129 b. Of course, it is understood that in other possible embodiments, the movement of the retraction adjustment member is not limited to movement, but may be rotational or a combination of rotational and movement.

Specifically, the support assembly 126 further includes a support rail 126b provided on the execution body 125, and the support arm 126a is movable along the support rail 126b, so that the movement of the support arm 126a is more stable. In addition, the support rail 126b may also limit movement of the support arm 126a in other directions. In particular, referring to fig. 15, 19 and 23, the support rail 126b has a rectangular ring shape in cross section. I.e. the track grooves 126d in the support track 126b are rectangular in cross section. The support arm 126a is partially inserted into the rail groove 126 d. The movement of the support arm 126a along the support rail 126b means that the support arm 126a moves within the rail groove 126 d.

Referring to fig. 15 and 19, the support rail 126b is provided with a guide portion 126c for guiding the movement of the shrinkage adjuster 129 b.

Specifically, the guide portion 126c is configured to guide the retraction adjuster 129b to move along the direction in which the support arm 126a moves.

More specifically, the guide portion 126c is a guide hole, and the shrinkage adjuster 129b is partially inserted into the guide portion 126 c.

Referring to fig. 15, 19 and 20, a fifth limiting portion 126e is provided on the support rail 126b, and a sixth limiting portion 126f is provided on the support arm 126 a; the fifth and sixth stop portions 126e, 126f mate to limit the continued distal movement of the support arm 126a as the support arm 126a is moved to the operative position.

Specifically, the fifth limiting portion 126e is a limiting post; the support arm 126a is provided with a limiting groove 126g, and the fifth limiting portion 126e is at least partially inserted into the limiting groove 126 g. The sixth limiting portion 126f is a proximal inner sidewall of the limiting groove 126 g. Obviously, the limiting groove 126g extends along the moving direction of the supporting arm 126a, so that the supporting arm 126a can move under the condition that the position of the fifth limiting part 126e relative to the supporting rail 126b is unchanged. The support arm 126a moves distally under the action of the second reset element 129a until the sixth limiting portion 126f abuts against the fifth limiting portion 126e, so as to limit the support arm 126a to move distally, so that the support arm 126a is kept in the working position under the combined action of the second reset element 129a and the sixth limiting portion 126 f.

Referring to fig. 15, 19 and 20, the fifth limiting portion 126e is a fastening screw provided on the support rail 126 b. The limiting groove 126g penetrates the support arm 126a in a direction perpendicular to the movement direction of the support arm 126a. The guide rail portion on the support rail 126b is a guide channel 126j, the support arm 126a is partially inserted into the guide channel 126j of the support rail 126b, and the limit groove 126g is partially located in the guide channel 126 j. When the support rail 126b is assembled with the support arm 126a, the support arm 126a may be inserted into the guide channel 126j, so that the position of the limiting slot 126g corresponds to the position of the fifth limiting portion 126e to be installed; the fifth limiting portion 126e is fixedly mounted on the supporting rail 126b, and is partially inserted into the limiting groove 126 g.

It will be appreciated that in other possible embodiments, the configuration of the fifth and sixth limiting portions is not so limited, and the support arm may be limited from continuing to move distally as it moves to the operative position.

Referring to fig. 15 and 16, the first operation knob 1210a is provided with at least two protrusions 1210b which are adjacent one another end to end, and the protrusions 1210b are arranged around the rotation axis of the first operation knob 1210 a. The driving support arm 126a moves from the working position to the retracted position, and the rotation angle of the first operation knob 1210a is less than 180 °; the driving support arm 126a moves from the working position to the retracted position and then from the retracted position to the working position, and the rotation angle of the first operation button 1210a is equal to 180 degrees, so that the operation of the operator is facilitated.

Further, referring to fig. 2 and 16, the first operation knob 1210a is further provided with an operation indication portion 1210d. On the one hand, the operation indication portion 1210d is provided to facilitate the operation of the operator; on the other hand, when the support arm 126a is located at the working position, the direction of the operation indication portion 1210d coincides with the moving direction of the support arm 126a, so that the operator can easily determine the position of the support arm 126 a.

Further, the operation instruction portion 1210d is located at the outer periphery of the first operation knob 1210 a. Thus, even when the operator operates the first operation knob 1210a, the operator can easily observe the operation instruction portion 1210d, and thus determine the rotation of the first operation knob 1210a, and thus the position of the support arm 126 a.

Referring to fig. 2, 15 and 22, the operating mechanism 1210 further includes a second operating knob 1210e rotatably provided on the first operating knob 1210 a. The second operation knob 1210e is rotatable to drive the support arm 126a to rotate. The axis of rotation of the support arm 126a is perpendicular to the axis of rotation of the follower roller 128. The rotation axis of the support arm 126a is perpendicular to the transmission direction of the driving roller 127 and the driven roller 128. For ease of understanding, the rotation axis of the driven roller 128 is vertical with the visual direction of fig. 15 as a reference, the transmission directions of the driving roller 127 and the driven roller 128 are lateral, and the rotation axis of the support arm 126a is perpendicular to the paper surface of fig. 15. In contrast to fig. 15 and 21, fig. 21 is a schematic structural view of the support arm 126a in fig. 15 after rotation. Of course, the relative positions of support arm 126a and abrasive belt 1211 will vary depending on the particular requirements of support arm 126a before and after rotation. For example, when abrasive belt 1211 is positionally misaligned, abrasive belt 1211 may be aligned with support arm 126a by way of support arm 126a rotating; this may also be accomplished by rotating support arm 126a when the work environment requires fine adjustment of the position of abrasive belt 1211.

In the present embodiment, the rotation axis of the driving roller 127 is parallel to the rotation axis of the driven roller 128, and the transmission direction of the driving roller 127 and the driven roller 128 is parallel to the movement direction of the support arm 126 a. The axis of rotation of the support arm 126a is perpendicular to the axis of rotation of the drive roller 127. The axis of rotation of the support arm 126a is perpendicular to the direction of movement of the support arm 126 a.

In addition, the second operation knob 1210e is disposed on the first operation knob 1210a, so as to avoid the space occupation of the execution body 125, and make the structure of the execution body 125 simpler. I.e. the structure of the execution unit 120 is made simpler.

Specifically, referring to fig. 15, the second operation knob 1210e rotates to drive the support rail 126b to rotate. The support rail 126b rotates to rotate the support arm 126 a. Namely, the second operation knob 1210e drives the support arm 126a to rotate through the support rail 126 b.

More specifically, the second operating knob 1210e is screwed to the support rail 126b, and the position where the second operating knob 1210e is connected to the support rail 126b is deviated from the rotation axis of the support rail 126b, i.e., the support rail 126b is of a lever structure. Specifically, the second operation knob 1210e is rotatably disposed on the first operation knob 1210a, and the first operation knob 1210a is rotatably disposed on the execution body 125, that is, the second operation knob 1210e rotates relative to the execution body 125. And the support rail 126b is rotatably provided on the execution body 125. And according to the foregoing structural description, the rotation axis of the support rail 126b is parallel to the rotation axis of the support arm 126 a. The rotation axis of the second operation knob 1210e is perpendicular to the rotation axis of the support rail 126 b. The second operating knob 1210e is screwed with the support rail 126b, and the connection position is deviated from the rotation axis of the support rail 126b, and the rotation of the second operating knob 1210e drives the support rail 126b to rotate.

The execution unit 120 further includes a rotating shaft 1212 disposed on the execution body 125. The distal end of the support rail 126b has a pivot hole 126m that mates with the pivot shaft 1212. It will be appreciated that rotation of support rail 126b is to rotate support arm 126a, and rotation of support arm 126a is to effect fine adjustment of the relative position between support arm 126a and belt 1211, or fine adjustment of the position of belt 1211 by support arm 126 a. Therefore, the angle of rotation of the support arm 126a is generally smaller, so the angle of rotation of the support rail 126b is also smaller, and the effect of the support rail 126b on supporting the support arm 126a is not affected.

Further, an elastic member 1213 is provided between the proximal end of the support rail 126b and the execution body 125. Thereby better avoiding deformation of the support rail 126b during rotation.

Specifically, referring to fig. 15, 16 and 22, the first operation knob 1210a is provided with a relief hole 1210f. The second operation knob 1210e includes a second operation portion 1210g, a connection portion 1210h inserted into the escape hole 1210f, and a screw portion 1210j; the second operation portion 1210g is fixedly connected to the screw portion 1210j via a connection portion 1210 h. More specifically, in the embodiment shown in fig. 22, the connection portion 1210h is integrally formed with the screw portion 1210 j. The connection portion 1210h is fixedly connected to the second operation portion 1210 g. It will be appreciated that in other possible embodiments, the connection portion and the threaded portion may be separately provided and fixedly connected, the second operation portion and the connection portion may be integrally formed, and the second operation portion, the connection portion and the threaded portion may be integrally formed.

Alternatively, the rotation axis of the first manipulation knob 1210a is collinear with the rotation axis of the second manipulation knob 1210 e. Further, the second operation knob 1210e is located at the inner periphery of the first operation knob 1210 a. The outer diameter of the second operation knob 1210e is smaller than the inner diameter of the first operation knob 1210 a. Thus, the operation of the first operation knob 1210a and the operation of the second operation knob 1210e do not affect each other, so that the structure of the operation mechanism is simpler.

Further, specifically, referring to fig. 22, the first operation knob 1210a is configured to: a cylindrical recess 1210k is provided around the rotation axis of the first manipulation knob 1210a, a second manipulation portion 1210g of the second manipulation knob 1210e is provided in the cylindrical recess 1210k, and the cylindrical recess 1210k provides a rotation space of the second manipulation portion 1210 g. Thus, the dimension of the operating mechanism 1210 in the rotation axis direction of the first operating knob 1210a can be reduced.

More specifically, the cylindrical recess 1210k mates with the second operation portion 1210g of the second operation knob 1210 e. The cylindrical recess 1210k communicates with the relief hole 1210f and is coaxial.

Two protruding portions 1210b, which are adjacent end to end in this order, are arranged around the outer wall of the escape hole 1210f of the first operation knob 1210 a. Therefore, the arrangement of the convex portion 1210b does not affect the operation of the second operation knob 1210 e.

Referring to fig. 23, a seventh limit portion 125a is provided on the execution body 125. The support rail 126b is provided with an eighth stopper 126k. The seventh limiting portion 125a is matched with the eighth limiting portion 126k to limit the position of the support rail 126b in the first direction. The first direction is perpendicular to the transmission direction of the driving roller 127 and the driven roller 128, and the first direction is perpendicular to the rotation axis direction of the driven roller 128. Thereby avoiding the support rail 126b from swinging or moving in the first direction.

Specifically, the seventh limiting portion 125a is a limiting post, and the eighth limiting portion 126k is a limiting groove parallel to the transmission direction of the driving roller 127 and the driven roller 128; the seventh limit portion 125a is at least partially inserted into the eighth limit portion 126k.

Referring to fig. 1 and 15, the actuating body 125 has a receiving cavity 125b, and the receiving cavity 125b has a first opening 125c. The first opening 125c is located at a side of the execution body 125 remote from the driving unit 150. The execution unit 120 further includes a safety shield 1214 fixedly disposed at the first opening 125c. Safety shield 1214 is configured to cover the proximal end of abrasive band 1211, the area surrounded by the proximal end of abrasive band 1211, and the area outside the proximal end of abrasive band 1211, the projection of the proximal end of abrasive band 1211 onto safety shield 1214 being spaced from the edge of safety shield 1214 by a distance greater than zero to prevent injury by an operator's finger extending into the area around the proximal end of abrasive band 1211.

Referring to fig. 1, a handle 160 and a sub-handle 170 are further provided on the main body 110 of the belt sander to facilitate the operator's grip.

It should be understood that the above examples are illustrative and are not intended to encompass all possible implementations encompassed by the claims. Various modifications and changes may be made in the above embodiments without departing from the scope of the disclosure. Likewise, the individual features of the above embodiments can also be combined arbitrarily to form further embodiments of the utility model which may not be explicitly described. Therefore, the above examples merely represent several embodiments of the present utility model and do not limit the scope of protection of the patent of the present utility model.

Claims (25)

1. A belt sander, characterized by comprising an execution unit (120);

the execution unit (120) includes:

an execution body (125);

-a support assembly (126), the support assembly (126) comprising a support arm (126 a) movably provided on the execution body (125); -the support arm (126 a) is movable to switch between an operative position and a retracted position;

a drive roller (127) rotatably provided on the execution body (125) and located on the proximal end side of the support arm (126 a);

A driven roller (128) rotatably provided at the distal end of the support arm (126 a);

an operation mechanism (1210) including a first operation knob (1210 a) rotatably provided on the execution body (125), and a second operation knob (1210 e) rotatably provided on the first operation knob (1210 a); the first operating knob (1210 a) is rotatable to drive the support arm (126 a) proximally to a retracted position; the second operation button (1210 e) is rotatable to drive the support arm (126 a) to rotate; the axis of rotation of the support arm (126 a) is perpendicular to the axis of rotation of the drive roller (127); the axis of rotation of the support arm (126 a) is perpendicular to the direction of movement of the support arm (126 a).

2. Belt sander according to claim 1, wherein the support assembly (126) further comprises a support rail (126 b) provided on the implement body (125), the support arm (126 a) being movable along the support rail (126 b).

3. Belt sander according to claim 2, wherein the second operating knob (1210 e) is turned to drive the support rail (126 b) to rotate; the support rail (126 b) rotates to drive the support arm (126 a) to rotate.

4. A belt sander according to claim 3, wherein the execution unit (120) further comprises a spindle (1212) provided on the execution body (125); the distal end of the support rail (126 b) has a swivel hole (126 m) that mates with the swivel shaft (1212).

5. Belt sander according to claim 4, characterized in that an elastic element (1213) is provided between the proximal end of the support rail (126 b) and the executing body (125).

6. Abrasive belt machine according to any one of claims 3-5, characterized in that the second operating knob (1210 e) is screwed with the support rail (126 b) and that the position where the second operating knob (1210 e) is connected with the support rail (126 b) is offset from the axis of rotation of the support rail (126 b).

7. Belt sander according to claim 6, characterized in that the first operating knob (1210 a) is provided with a relief hole (1210 f); the second operation button (1210 e) includes a second operation portion (1210 g), a connection portion (1210 h) inserted into the escape hole (1210 f), and a screw portion (1210 j); the second operation part (1210 g) is fixedly connected with the threaded part (1210 j) through the connecting part (1210 h).

8. Belt sander according to claim 1, characterized in that the axis of rotation of the first operating knob (1210 a) is collinear with the axis of rotation of the second operating knob (1210 e).

9. Belt sander according to claim 7, wherein the first operating button (1210 a) is configured to: a cylindrical recess (1210 k) is provided around the rotation axis of the first operation knob (1210 a), a second operation portion (1210 g) of the second operation knob (1210 e) is provided to the cylindrical recess (1210 k), and the cylindrical recess (1210 k) provides a rotation space of the second operation portion (1210 g).

10. A belt sander according to claim 3, wherein a seventh limit part (125 a) is provided on the executing body (125); an eighth limit part (126 k) is arranged on the support rail (126 b); the seventh limit portion (125 a) is matched with the eighth limit portion (126 k) to limit the position of the support rail (126 b) along the first direction; the first direction is perpendicular to a transmission direction of the driving roller (127) and the driven roller (128), and the first direction is perpendicular to a rotation axis direction of the driven roller (128).

11. Belt sander according to claim 10, characterized in that the seventh limit part (125 a) is a limit post, the eighth limit part (126 k) is a limit groove parallel to the transmission direction of the drive roller (127) and the driven roller (128); the seventh limiting part (125 a) is at least partially inserted into the eighth limiting part (126 k).

12. Belt sander according to any one of claims 2-5, wherein the execution unit (120) further comprises an adjustment assembly (129) comprising a return element and a retraction adjustment element (129 b); the reset member is configured to: providing a return force for the support arm (126 a) to return to an operative position; the contraction adjusting piece (129 b) is movably arranged on the execution body (125);

A convex part (1210 b) matched with the contraction adjusting piece (129 b) is arranged on the inner side of the first operation button (1210 a); the first operation button (1210 a) is configured to: when the first operation button (1210 a) rotates, the protrusion (1210 b) drives the shrinkage adjusting piece (129 b) to move so as to drive the supporting arm (126 a) to move proximally to the shrinkage position against the restoring force of the restoring piece.

13. Belt sander according to claim 12, characterized in that the projection (1210 b) is provided with a fourth limit (1210 c) matching the shrinkage adjustment member (129 b); the fourth limit portion (1210 c) is configured to: when the first operation knob (1210 a) is rotated to drive the support arm (126 a) to be located at the contracted position, the contraction adjusting member (129 b) is restricted from continuing to move.

14. Belt sander according to claim 13, wherein the fourth limiting part (1210 c) is a limiting groove, and the shrinkage adjusting member (129 b) is inserted into the fourth limiting part (1210 c) under the action of the resetting member.

15. Belt sander according to claim 14, wherein the fourth limit part (1210 c) has inclined side walls on both sides and inclined outward at its free ends in the circumferential direction of the protrusion (1210 b).

16. Belt sander according to claim 12, characterized in that the retraction adjustment element (129 b) is movably arranged on the actuating body (125).

17. Belt sander according to claim 12, characterized in that the support rail (126 b) is provided with a guide (126 c) for guiding the movement of the retraction adjuster (129 b).

18. Belt sander according to claim 17, wherein the guide (126 c) is adapted to guide the movement of the retraction adjuster (129 b) in the direction of movement of the support arm (126 a).

19. Belt sander according to claim 17 or 18, wherein the guide (126 c) is a guide slot, and the retraction adjustment element (129 b) is partially inserted into the guide (126 c).

20. Belt sander according to claim 12, characterized in that a fifth limit part (126 e) is provided on the support rail (126 b), and a sixth limit part (126 f) is provided on the support arm (126 a); the fifth limit portion (126 e) and the sixth limit portion (126 f) mate to limit the continued distal movement of the support arm (126 a) when the support arm (126 a) is moved to the operative position.

21. Abrasive belt machine according to claim 20, characterized in that the fifth limit part (126 e) is a limit post, the support arm (126 a) is provided with a limit groove (126 g), and the fifth limit part (126 e) is at least partially inserted into the limit groove (126 g); the sixth limiting part (126 f) is an inner side wall at the proximal end of the limiting groove (126 g).

22. Belt sander according to claim 12, characterized in that the first operating knob (1210 a) is provided with a relief hole (1210 f); the second operation button (1210 e) includes a second operation portion (1210 g), a connection portion (1210 h) inserted into the escape hole (1210 f), and a screw portion (1210 j); the second operation part (1210 g) is fixedly connected with the threaded part (1210 j) through the connecting part (1210 h);

the first operation button (1210 a) is provided with at least two protruding parts (1210 b) which are adjacent end to end in sequence, and the protruding parts (1210 b) which are adjacent end to end in sequence are arranged around the outer wall of the avoidance hole (1210 f) of the first operation button (1210 a).

23. Belt sander according to claim 12, characterized in that the projection (1210 b) is located on the side of the first operating knob (1210 a) facing the support arm (126 a).

24. Belt sander according to claim 1, characterized in that the first operating button (1210 a) is further provided with an operating indication part (1210 d), said operating indication part (1210 d) being located at the periphery of the first operating button (1210 a).

25. Belt sander according to claim 1, further comprising a drive mechanism to drive the implement unit (120); the execution body (125) has a receiving cavity (125 b), the receiving cavity (125 b) having a first opening (125 c); the first opening (125 c) is located on a side of the execution body (125) remote from the drive mechanism;

The execution unit (120) further comprises a safety protection plate (1214) fixedly arranged at the first opening (125 c); the safety shield (1214) is configured to cover a proximal end of the abrasive belt (1211), an area surrounded by the proximal end of the abrasive belt (1211), and an area outside the proximal end of the abrasive belt (1211), wherein a distance between a projection of the proximal end of the abrasive belt (1211) onto the safety shield (1214) and an edge of the safety shield (1214) is greater than zero.

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