Polishing machine with polishing disc capable of being rapidly replaced

Abstract

The utility model discloses a polishing machine with a polishing disk capable of being replaced quickly, which comprises a machine body, an output shaft arranged on the machine body and used for outputting rotating power, and the polishing disk detachably connected to the output shaft, an annular locking piece is arranged on the machine body, and the locking piece is sleeved on the outer side of the output shaft. The locking piece can move and switch between a locking position and an unlocking position relative to the machine body in the axial direction of the output shaft, when the locking piece moves to the locking position relative to the machine body, the locking piece and the output shaft form clamping connection so as to limit relative rotation of the output shaft and the machine body, and when the locking piece moves to the unlocking position relative to the machine body, the locking piece and the output shaft are separated from clamping connection so as to limit relative rotation of the output shaft and the machine body. The output shaft can rotate relative to the machine body, rotation locking of the output shaft is achieved by relatively moving the locking piece in the axial direction of the output shaft, the output shaft does not need to be fixed through tools such as a wrench when the polishing disc is disassembled, the purpose of conveniently replacing the polishing disc is achieved, and the structure is simple.

Description

TECHNICAL FIELD

[0001] The utility model relates to a polishing machine, especially a polishing machine with polishing disc capable of being quickly replaced. BACKGROUND

[0002] The polishing machine is also called a grinding machine, which is often used for mechanical grinding, polishing and waxing. The working principle is that the motor drives the polishing disc installed on the polishing machine to rotate at high speed. Due to the combined action of the polishing disc and the polishing agent and the friction with the surface to be polished, the purpose of removing paint surface pollution, oxidation layer and shallow marks can be achieved.

[0003] For example, the secondary reduction gear box structure of a handheld straight core electric polisher disclosed in patent CN209831242U includes a polishing disc, a front cover, a first bearing, a gear box, a second bearing, a nut, a third bearing, a planet carrier, a gear ring, a fourth bearing, an intermediate cover, a machine shell, a bearing and a stator. A rotor is inserted in the machine shell. The right end of the machine shell is fixedly connected with the gear box through the intermediate cover. The lower end of the gear box is provided with the front cover. The lower side of the front cover is provided with the polishing disc. The inside of the front cover is provided with an output shaft. The bottom end of the output shaft is connected with the polishing disc through threads. The output shaft is transmissionally connected with the rotor shaft.

[0004] At present, the polishing disc and the output shaft are connected through threads. When the polishing disc needs to be replaced, the output shaft will rotate relative to the machine body. In order to disassemble the polishing disc, the output shaft is usually fixed by using a wrench and the like, and the polishing disc is rotated in the reverse direction with force to overcome the self-locking force, so as to realize the disassembly of the polishing disc. The operation is relatively complicated and time-consuming. UTILITY MODEL CONTENTS

[0005] Based on the above-mentioned problem that the output shaft will rotate relative to the machine body when the polishing disc is disassembled, a wrench or the like is needed to fix the output shaft, and the polishing disc is rotated in the reverse direction with force to realize the disassembly of the polishing disc, the utility model provides a polishing machine with polishing disc capable of being quickly replaced.

[0006] The technical scheme adopted by the utility model to solve the above-mentioned technical problem is that the polishing machine with polishing disc capable of being quickly replaced comprises a machine body, an output shaft arranged on the machine body and used for outputting rotary power, and a polishing disc which is detachably connected to the output shaft. An annular lock piece is arranged on the machine body. The lock piece is sleeved on the outside of the output shaft and can move along the axial direction of the output shaft relative to the machine body between a locking position and an unlocking position.

[0007] When the lock piece moves to the locking position relative to the machine body, the lock piece is clamped with the output shaft to limit the relative rotation of the output shaft and the machine body.

[0008] When the lock piece moves to the unlocking position relative to the machine body, the lock piece is separated from the output shaft, so that the polishing disc can be rotated relative to the output shaft.When the lock moves to the unlocking position relative to the body, the lock is disengaged from the output shaft, and the output shaft can rotate relative to the body.

[0009] The further preferred technical scheme of the utility model is that: the polishing machine further includes elastic member for providing reset force to the lock, when the lock moves to the locking position relative to the body under external force, the lock is engaged with the output shaft, when the external force is removed, the elastic member drives the lock to move and reset to the unlocking position.

[0010] The further preferred technical scheme of the utility model is that: the lock is provided with hole for the output shaft to pass through, the hole is provided with first engaging surface, the output shaft is provided with second engaging surface for engaging with the first engaging surface, when the lock moves to the locking position relative to the body, the first engaging surface moves to the position opposite to the second engaging surface to form the engagement.

[0011] The further preferred technical scheme of the utility model is that: the lock is provided with hole for the output shaft to pass through, one of the hole and the output shaft is provided with engaging convex part, and the other is provided with engaging groove for engaging with the engaging convex part, when the lock moves to the locking position relative to the body, the engaging convex part enters the engaging groove to form the engagement.

[0012] The further preferred technical scheme of the utility model is that: the body is fixed with a plurality of guide members, the lock is sleeved on the guide members and moves along the axial direction of the output shaft under the guidance of the guide members.

[0013] The further preferred technical scheme of the utility model is that: the lock is provided with positioning groove, the body is provided with protruding positioning convex part, the output shaft extends out of the body from the positioning convex part, when the lock is driven to move to the unlocking position by the elastic member, the positioning convex part is inserted into the positioning groove.

[0014] The further preferred technical scheme of the utility model is that: the lock is provided with hole for the output shaft to pass through, the hole includes first hole and second hole from bottom to top, the inner diameter of the first hole is larger than that of the second hole, first step is arranged between the first hole and the second hole, the upper end of the second hole is communicated with the positioning groove at the upper end of the lock, the lower end of the first hole is communicated with the lower end of the lock, second step is arranged between the second hole and the positioning groove for the positioning convex part to insert and abut, the second hole is provided with engaging part for engaging with the output shaft, the guide member is guide bolt screwed on the body, the elastic member is reset spring, spring groove is arranged on the first step for accommodating the reset spring, guide hole is arranged on the upper bottom of the spring groove for the guide bolt to pass through, the reset spring is sleeved on the guide bolt, one end of the reset spring abuts on the upper bottom of the spring groove, and the other end abuts on the head of the guide bolt.

[0015] The further preferred technical scheme of the utility model provides: a plurality of cutout grooves are evenly arranged on the circumference of the lock piece, so as to form a hand holding area on the lock piece for the hand to hold, and a third step is arranged between the cutout groove and the lower lock piece part.

[0016] The further preferred technical scheme of the utility model provides: anti-skid lines are arranged on the surface of the hand holding area.

[0017] The further preferred technical scheme of the utility model provides: the polishing disc is threadedly connected with the end of the output shaft.

[0018] Compared with the prior art, the utility model has the advantages that the annular lock piece is arranged on the machine body, the lock piece is sleeved on the outside of the output shaft, the lock piece can be moved along the axial direction of the output shaft relative to the machine body to switch between the locking position and the unlocking position, when the lock piece moves to the locking position relative to the machine body, the lock piece is clamped with the output shaft to limit the relative rotation of the output shaft and the machine body, when the lock piece moves to the unlocking position relative to the machine body, the lock piece is disengaged from the clamping of the output shaft, and the output shaft can rotate relative to the machine body, the rotation of the output shaft is locked by moving the lock piece along the axial direction of the output shaft, so that the output shaft does not need to be fixed by a wrench or other tools when the polishing disc is disassembled, the polishing disc is convenient to replace, and the structure is simple. BRIEF DESCRIPTION OF DRAWINGS

[0019] The utility model will be further described in detail below by combining with the drawings and preferred embodiments, but the person skilled in the art will appreciate that these drawings are only drawn for the purpose of explaining the preferred embodiments, and therefore should not be regarded as the limitation to the scope of the utility model. In addition, unless specifically pointed out, the drawings only schematically show the composition or structure of the described object conceptually and can contain exaggerated display, and the drawings are not necessarily drawn to scale.

[0020] Figure 1 It is the structure schematic of the utility model Figure 1 ; It is the structure schematic of the utility model

[0021] Figure 2 It is the structure schematic of the utility model Figure 2 ; It is the structure schematic of the utility model

[0022] Figure 3 It is the cutaway schematic view when the lock piece of the utility model is in the unlocking position;

[0023] Figure 4 It is the A place enlarged view of Figure 3 ;

[0024] Figure 5 It is the cutaway schematic view when the lock piece of the utility model is in the locking position;

[0025] Figure 6 It is the cutaway schematic view when the lock piece of the utility model is in the locking position; Figure 5a local enlarged view of B in FIG.

[0026] Figure 7 is a schematic view of a transverse section of the utility model;

[0027] Figure 8 is Figure 7 a local enlarged view of C in FIG.

[0028] Figure 9 is a schematic view of the top structure of the locking piece;

[0029] Figure 10 is a schematic view of the bottom structure of the locking piece;

[0030] Figure 11 is a schematic view of the structure of the output shaft.

[0031] In the figure: 1, machine body; 2, polishing disc; 3, locking piece; 4, machine shell; 5, motor; 6, middle cover; 7, gear box; 8, front cover; 9, output shaft; 10, first bevel gear; 11, second bevel gear; 12, extension hole; 13, positioning convex part; 14, positioning groove; 15, protruding block; 16, first clamping surface; 17, second hole channel; 18, first hole channel; 19, second clamping surface; 20, threaded hole; 21, guide hole; 22, spring groove; 23, return spring; 24, guide bolt; 25, head; 26, first step; 27, second step; 28, cutout groove; 29, third step. DETAILED DESCRIPTION

[0032] The preferred embodiments of the utility model will be described in detail below with reference to the drawings. Those skilled in the art will appreciate that these descriptions are merely descriptive, exemplary, and should not be interpreted as limiting the scope of protection of the utility model.

[0033] It should be noted that: similar reference numerals represent similar items in the following drawings, therefore, once an item is defined in one drawing, it can not be further defined and explained in the subsequent drawings.

[0034] Figures 1-11 As shown, the polishing disc quick-change polishing machine comprises a machine body 1, an output shaft 9 arranged on the machine body 1 and used for outputting rotary power, and a polishing disc 2 detachably connected to the output shaft 9.

[0035] Figures 1-3As shown, the machine body 1 comprises a casing 4, an intermediate cover 6, a gear box 7 and a front cover 8, the front end of the casing 4 is fixedly connected with the gear box 7 through the intermediate cover 6, the lower end of the gear box 7 is provided with the front cover 8, the casing 4 is provided with a motor 5, the motor shaft of the motor 5 extends into the gear box 7, the gear box 7 is provided with an output shaft 9, the front cover 8 is provided with an extension hole 12 for the output shaft 9 to extend downward, the motor shaft and the output shaft 9 are perpendicularly changed in direction and transmitted. The rear part of the casing 4 is formed with a handle for holding.

[0036] Specifically, the end of the motor shaft extending into the gear box 7 is fixed with a first bevel gear 10, the output shaft 9 is fixed with a second bevel gear 11 engaged with the first bevel gear 10, the motor shaft and the output shaft 9 are transmitted through the first bevel gear 10 and the second bevel gear 11.

[0037] Preferably, the polishing disc 2 is threadedly connected with the end of the output shaft 9. For example, the polishing disc 2 is provided with a nut, and the polishing disc 2 is threadedly connected with the end of the output shaft 9 through the internally provided nut; or the polishing disc 2 is provided with a threaded mounting hole, the end of the output shaft 9 is provided with external threads matched with the mounting hole, and the end of the output shaft 9 is inserted into the mounting hole and threadedly connected therewith. The present patent is not limited to the above-mentioned structure of threadedly connecting the polishing disc 2 with the end of the output shaft 9, and other mounting structures are also applicable to the present patent, for example, a bearing step is provided on the output shaft 9, the polishing disc 2 is provided with an assembly hole through which the output shaft 9 passes, and a fastening nut is threadedly connected with the output shaft 9, which presses the output shaft 9 against the bearing step to be fixed.

[0038] The machine body 1 is provided with a ring-shaped locking piece 3, which is sleeved on the outside of the output shaft 9, and the locking piece 3 can move relative to the machine body 1 along the axial direction of the output shaft 9, so that the locking piece 3 can be moved and switched between a locking position and an unlocking position.

[0039] Figure 5 、 Figure 6 As shown, when the locking piece 3 moves relative to the machine body 1 to the locking position, the locking piece 3 is clamped with the output shaft 9 to limit the relative rotation of the output shaft 9 and the machine body 1. Figure 3 、 Figure 4 As shown, when the locking piece 3 moves relative to the machine body 1 to the unlocking position, the locking piece 3 is disengaged from the clamping with the output shaft 9, and the output shaft 9 can rotate relative to the machine body 1.

[0040] The present patent can realize the rotation locking of the output shaft 9 by moving the locking piece 3 relative to the machine body 1 along the axial direction of the output shaft 9, so that when the polishing disc 2 is disassembled, it is not necessary to fix the output shaft 9 by means of a wrench or other tools, and the purpose of facilitating the replacement of the polishing disc 2 is achieved, and the structure is simple.

[0041] The locking piece 3 is a closed loop or a non-closed loop ring structure.

[0042] The polishing machine further comprises an elastic member for providing a reset force to the locking member 3, when the locking member 3 is moved downward relative to the body 1 to the locking position under an external force, the locking member 3 is clamped with the output shaft 9, when the external force is removed, the elastic member drives the locking member 3 to move upward to the unlocking position. In the normal use state, the locking member 3 is kept in the unlocking position by the action of the elastic member, so that the locking member 3 cannot move downward to interfere with the output rotating power of the output shaft 9.

[0043] The body 1 is fixed with a plurality of guide members, the locking member 3 is sleeved on the guide members and moves along the axial direction of the output shaft 9 under the guidance of the guide members, the guide members limit the movement of the locking member 3 relative to the body 1 in the axial direction of the output shaft 9, keep the stability of the movement of the locking member 3, prevent the locking member 3 from rotating around the output shaft 9, or prevent the locking member 3 from moving along the radial direction of the output shaft 9, or prevent the locking member 3 from deflecting upward and downward.

[0044] Figure 9 、 Figure 10 As shown in the drawings, the locking member 3 is a cylindrical structure, the center of the locking member 3 is provided with a hole for the output shaft 9 to pass through, the hole includes a first hole 18 and a second hole 17 from bottom to top, the inner diameter of the first hole 18 is larger than that of the second hole 17, a first step 26 is arranged between the first hole 18 and the second hole 17, the lower end of the first hole 18 is communicated with the lower end face of the locking member 3, the guide member is a guide bolt 24 screwed on the body 1, the elastic member is a reset spring 23, the first step 26 is provided with a spring groove 22 for accommodating the reset spring 23, the upper bottom of the spring groove 22 is provided with a guide hole 21 for the guide bolt 24 to pass through, the guide bolt 24 is screwed on the body 1 through the spring groove 22 and the guide hole 21, the reset spring 23 is sleeved on the guide bolt 24, one end of the reset spring 23 is abutted on the upper bottom of the spring groove 22, and the other end is abutted on the head 25 of the guide bolt 24 at the lower end, so that the reset spring 23 has an upward pushing elastic force on the locking member 3, the locking member 3 can be abutted upward on the body 1, and the head 25 of the guide bolt 24 can also limit the locking member 3 from moving downward to disengage.

[0045] Preferably, the number of guide bolts 24 is three, the number of reset springs 23 is the same as that of the guide bolts 24, the first step 26 is provided with three spring grooves 22 arranged in a uniform circular array with the center of the axial line of the locking member 3, the upper end of each spring groove 22 is connected with a guide hole 21, the front cover 8 is provided with three threaded holes 20 corresponding to the three guide holes 21 respectively, the three guide bolts 24 passing through the guide holes 21 are screwed on the three threaded holes 20 respectively, the locking member 3 is arranged on the bottom of the front cover 8, at this time, the output shaft 9 extending from the through hole 12 of the front cover 8 passes through the hole of the locking member 3.

[0046] The second hole 17 is provided with a first clamping part, and the output shaft 9 is provided with a second clamping part clamped with the first clamping part.

[0047] When in natural state, the lock piece 3 is in unlocking position by the action of the reset spring 23, at this time the second clamping part on the output shaft 9 is misaligned with the first clamping part in the second channel 17, the output shaft 9 can rotate relative to the body 1; when the lock piece 3 is moved to the locking position by external force, the first clamping part in the second channel 17 moves to the position opposite to the second clamping part, at this time the first clamping part and the second clamping part form clamping, the lock piece 3 locks the rotation of the output shaft 9 relative to the body 1.

[0048] The structure of the first clamping part and the second clamping part has various schemes, as follows:

[0049] Figures 9-11 As shown in one scheme, the first clamping part is the first clamping surface 16 arranged in the second channel 17, the second clamping part is the second clamping surface 19 arranged on the output shaft 9 and clamped with the first clamping surface 16, when the lock piece 3 moves to the locking position relative to the body 1, the first clamping surface 16 moves to the position opposite to the second clamping surface 19 to form clamping. Preferably, the second clamping surface 19 is arranged on the symmetrical positions of both sides of the output shaft 9, the second clamping surface 19 is a cutting surface formed by cutting, the two side inner walls in the second channel 17 are both provided with the protruding lugs 15, the two lugs 15 are both provided with the opposite and parallel first clamping surfaces 16, the two first clamping surfaces 16 correspond to the two second clamping surfaces 19 on the output shaft 9 respectively.

[0050] Another scheme, one of the first clamping part and the second clamping part is the clamping protrusion, the other is the clamping groove clamped with the clamping protrusion, when the lock piece 3 moves to the locking position relative to the body 1, the clamping protrusion enters the clamping groove to form clamping. Preferably, the clamping protrusion is arranged on the inner wall of the second channel 17, the clamping groove is arranged on the circumferential side wall of the output shaft 9.

[0051] In addition, the lock piece 3 is provided with the positioning groove 14, the positioning groove 14 is arranged on the upper end of the lock piece 3 and opposite to the front cover 8, the body 1 is provided with the protruding positioning protrusion 13, the positioning protrusion 13 is arranged on the bottom of the front cover 8, the above-mentioned protruding hole 12 is arranged on the lower end face of the positioning protrusion 13, the output shaft 9 extends out of the body 1 from the protruding hole 12 on the positioning protrusion 13, the upper end of the second channel 17 communicates with the positioning groove 14 on the upper end of the lock piece 3, the lower end of the first channel 18 communicates with the lower end of the lock piece 3, the second channel 17 and the positioning groove 14 are provided with the second step 27, when the lock piece 3 is driven to move to the unlocking position by the elastic member, the positioning protrusion 13 is inserted into the positioning groove 14 to position the lock piece 3, the positioning protrusion 13 abuts against the second step 27, the lock piece 3 can be more stably in the unlocking position through the insertion of the positioning protrusion 13 and the positioning groove 14, avoiding the transverse shaking of the lock piece 3 relative to the body 1 when the polishing machine works.

[0052] The lock piece 3 is uniformly provided with a plurality of cutout grooves 28 in the circumferential direction to form a hand holding area on the lock piece 3 for the hand to grip. The cutout groove 28 is provided with a third step 29 below the lock piece 3 part. When disassembling, the user can grip the inner wall of the cutout groove 28 with fingers to pull the lock piece 3 up and down to make the lock piece 3 move down to the locking position. The third step 29 can be used as a resting position when the fingers pull down. Preferably, the upper half of the cylindrical lock piece 3 is provided with a plurality of cutout grooves 28 on the side wall. The cutout groove 28 penetrates the upper end of the lock piece 3 upwards to form a hand holding area on the upper half of the lock piece 3 for the user to grip. The cutout groove 28 is provided with three cutout grooves 28 which are arranged in a ring around the center line of the lock piece 3.

[0053] The surface of the hand holding area is provided with anti-skid lines for anti-skid when gripping. Preferably, the anti-skid lines can be stripes, concave-convex or rubber strips and the like. The anti-skid lines are not necessarily the structure of the patent.

[0054] The above describes the polishing machine with quickly replaceable polishing disc provided by the utility model. The principle and implementation mode of the utility model are described by applying specific examples in this paper. The above description of the embodiments is only used to help understand the utility model and the core idea. It should be pointed out that the ordinary skilled in the art can make some improvements and modifications to the utility model without departing from the principle of the utility model. These improvements and modifications also fall within the protection scope of the utility model claims.

Claims

1. A polishing machine with quick change of polishing disc, comprising a machine body, an output shaft arranged on the machine body for output of rotary power, and a polishing disc detachably connected to the output shaft, characterized in that, The lock member is sleeved on the outside of the output shaft and is movable along the axial direction of the output shaft relative to the machine body between a locking position and an unlocking position, When the lock member moves to the locking position relative to the machine body, the lock member is in engagement with the output shaft to limit the relative rotation between the output shaft and the machine body, When the lock member moves to the unlocking position relative to the machine body, the lock member is disengaged from the output shaft, and the output shaft is rotatable relative to the machine body.

2. The disc-polishing machine according to claim 1, wherein The polishing machine further comprises an elastic member for providing a restoring force to the lock member, when the lock member is moved to the locking position relative to the machine body under an external force, the lock member is in engagement with the output shaft, and when the external force is removed, the elastic member drives the lock member to move to the unlocking position.

3. The disc-polishing machine according to claim 1, wherein The lock member is provided with a hole through which the output shaft passes, and a first engagement surface is arranged in the hole, and a second engagement surface is arranged on the output shaft and is in engagement with the first engagement surface, when the lock member moves to the locking position relative to the machine body, the first engagement surface moves to a position opposite to the second engagement surface to form the engagement.

4. The disc-polishing machine according to claim 1, wherein The lock member is provided with a hole through which the output shaft passes, and one of the hole and the output shaft is provided with an engagement protrusion, and the other is provided with an engagement groove in engagement with the engagement protrusion, when the lock member moves to the locking position relative to the machine body, the engagement protrusion enters the engagement groove to form the engagement.

5. The disc-polishing machine according to claim 2, wherein The machine body is fixed with a plurality of guide members, and the lock member is sleeved on the guide members and is guided to move along the axial direction of the output shaft by the guide members.

6. The disc-polishing machine according to claim 5, wherein The lock member is provided with a positioning groove, and the machine body is provided with a raised positioning protrusion, and the output shaft extends out of the machine body from the positioning protrusion, when the lock member is driven by the elastic member to move to the unlocking position, the positioning protrusion is inserted into the positioning groove.

7. The disc-polishing machine according to claim 6, wherein The lock member is provided with a hole through which the output shaft passes, and the hole comprises a first hole and a second hole from bottom to top, the inner diameter of the first hole is greater than that of the second hole, a first step is arranged between the first hole and the second hole, the upper end of the second hole is communicated with a positioning groove arranged at the upper end of the lock member, the lower end of the first hole is communicated with the lower end of the lock member, a second step is arranged between the second hole and the positioning groove for the positioning protrusion to be inserted and abutted, the second hole is provided with an engagement portion in engagement with the output shaft, the guide member is a guide bolt screwed on the machine body, the elastic member is a return spring, a spring groove accommodating the return spring is arranged on the first step, a guide hole through which the guide bolt passes is arranged on the upper bottom of the spring groove, the return spring is sleeved on the guide bolt, one end of the return spring abuts on the upper bottom of the spring groove, and the other end abuts on the head of the guide bolt.

8. The disc-polishing machine according to claim 1 or 2, wherein A plurality of cut grooves are uniformly arranged in the circumferential direction of the lock member to form a hand holding area on the lock member for the hand to grip, and a third step is arranged between the cut groove and the lower part of the lock member.

9. The disc-polishing machine according to claim 8, wherein Anti-skid lines are arranged on the surface of the hand holding area.

10. The disc-polishing machine according to claim 1, wherein The polishing disc is threadedly connected with the end of the output shaft.

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