Electric grinding tool for narrow space

Abstract

The utility model discloses an electric polishing tool for a narrow space, which comprises a driving assembly, a motor elbow connected with the driving end of the driving assembly through a transmission assembly, and an elbow connecting hexagonal shaft, the transmission assembly comprises a main gear shaft, a gear seat and a gear sleeve arranged on the gear seat in a sleeving mode and connected with the gear seat through a second bearing body, one end of the main gear shaft is connected into the gear seat in a rotation stopping mode, and the other end of the main gear shaft is fixedly connected with the driving end of the driving assembly. At least one driven gear meshed with the main gear shaft and the gear sleeve is pivoted to the gear seat, and the elbow connecting hexagonal shaft is connected with the transmission assembly and the motor elbow and fixedly connected with the end, away from the driving assembly, of the gear seat in an inserted mode. The size and the overall quality of the electric polishing tool are effectively reduced, operation and use of workers are facilitated, and the electric polishing tool can be suitable for narrow space and is higher in applicability.

Description

TECHNICAL FIELD

[0001] The utility model relates to a grinding equipment technical field especially a kind of electric grinding tool for narrow space. BACKGROUND

[0002] The polishing machine is also called grinding machine, is often used as mechanical type grinding, polishing and waxing, its working principle is: driving motor drives the sponge or wool polishing disc installed on the output component of polishing machine high-speed rotation, by polishing disc and polishing agent mutual action and with the surface to be polished to carry out friction, i.e. realize the function of removing paint surface pollution, oxide layer, shallow mark. Market similar products usually adopt independent aluminum gear box and larger quality gear and motor, larger specification eccentric balance block, the whole has larger quality, inconvenient to use;And need to use higher input voltage, speed control fuzzy and inaccurate, load under the number of rotations drops significantly, high cost.

[0003] Therefore, it is necessary to provide an electric grinding tool for narrow space to solve the above problems. INVENTION CONTENTS

[0004] In order to overcome the above-mentioned shortcomings, the utility model aims at providing an electric grinding tool for narrow space, which effectively reduces the volume and overall quality of the electric grinding tool, facilitates the operation and use of the staff, and is suitable for narrow space and has stronger applicability.

[0005] In order to achieve the above purpose, the utility model adopts the technical scheme of an electric grinding tool for narrow space, comprising a driving assembly, a driving end of the driving assembly is connected with a motor elbow through a transmission assembly, and further comprising an elbow connecting hexagonal shaft;The transmission assembly comprises a main gear shaft, a gear seat and a gear sleeve which is sleeved on the gear seat and connected with the gear seat through bearing body two, one end of the main gear shaft is rotationally connected in the gear seat, the other end is fixedly connected with the driving end of the driving assembly, at least one driven gear which is engaged with the main gear shaft and the gear sleeve is pivotally connected on the gear seat, the elbow connecting hexagonal shaft connects the transmission assembly and the motor elbow, and it is fixedly inserted with the gear seat away from the driving assembly.

[0006] Further, the driving assembly comprises a motor shell and a driving motor located in the shell, one side of the motor shell close to the driving end of the driving motor is locked on the motor seat by fastening screw, and the transmission assembly is located in the motor seat.

[0007] That is, the motor seat has a limited space for the transmission assembly.

[0008] Further, the driving end, the main gear shaft, the gear seat and the elbow connecting hexagonal shaft of the driving assembly are coaxial. When the driving assembly is driven, the driving end and the main gear shaft have no vibration, and the main gear shaft needs small bearing capacity. The main gear shaft is connected with the inner wall of the motor seat through the bearing body one.

[0009] Further, the main gear shaft is connected with the inner wall of the motor seat through the bearing body one, and the bearing body one is a single-row bearing.

[0010] Further, the gear seat is provided with an axis insertion slot one and an axis insertion slot two coaxial with the gear seat at both ends in the length direction of the gear seat. The upper gear segment of the main gear shaft is at least partially located in the axis insertion slot one and engaged with the driven gear. The elbow connecting hexagonal shaft is at least partially inserted into the axis insertion slot two in an interference fit. The motor elbow and the transmission assembly are connected, and the stability of the transmission of the transmission assembly is ensured.

[0011] Further, the gear seat is provided with a gear accommodating cavity at both sides in the length direction of the axis insertion slot one. Each gear accommodating cavity is rotatably connected with the driven gear through the gear mounting shaft fixed horizontally thereon. The driven gear is provided with two driven gears located at both sides in the length direction of the main gear shaft to improve the stability of the rotation of the gear seat. The gear mounting shaft can support the driven gear, and the driven gear is located in the limited space formed between the inner wall of the gear sleeve and the gear seat.

[0012] Further, the end of the gear seat inserted with the elbow connecting hexagonal shaft is connected with the inner ring of the connecting sleeve through the bearing body three, and a sealing ring is installed between the outer ring of the connecting sleeve and the sealing screw locked on the gear seat. The connecting sleeve can protect the end of the gear seat connected with the motor elbow. The bearing body three is arranged to prevent the connecting sleeve from interfering with the rotation of the gear seat. The stability of the transmission between the gear seat and the motor elbow is ensured.

[0013] Further, the inner wall of the gear sleeve is circumferentially provided with a plurality of inner teeth parallel to the direction of the central shaft, and the outer surface of the gear sleeve is provided with external threads in the axial direction. The driven gear is engaged with the above-mentioned inner teeth, and when the main gear shaft rotates, the driven gear can move along the engagement of the inner teeth.

[0014] Further, the motor elbow further comprises an elbow connecting seat and a conversion assembly, the elbow connecting seat is connected with the motor seat through the connecting screw, and the conversion assembly is located in the elbow connecting seat.

[0015] Further, the conversion assembly comprises a driving bevel gear and a driven bevel gear perpendicular to the driving bevel gear, one end of the driving bevel gear away from the driven bevel gear is fixedly inserted with the elbow connecting hexagonal shaft, one end of the driven bevel gear away from the driving bevel gear is fixedly connected with an output main shaft extending to the outside of the elbow connecting seat, and the output main shaft is installed with the grinding base. When the gear seat rotates, the elbow connecting hexagonal shaft in excess insertion with the gear seat rotates to drive the driving bevel gear to rotate, the driven bevel gear meshes with the driving bevel gear, and the grinding base can be driven to rotate under the rotation of the driven bevel gear to polish the workpiece.

[0016] The utility model discloses the beneficial effects of:

[0017] In the utility model, the driving assembly, the transmission assembly, the motor elbow, the main gear shaft, the gear seat and the driven gear cooperate with each other, effectively reduce the volume and the overall quality of the electric polishing tool, facilitate the operation and use of the staff, and can be applicable to narrow space, and the applicability is stronger. BRIEF DESCRIPTION OF DRAWINGS

[0018] Fig. 1 It is the overall structure axial side view of an embodiment of the utility model;

[0019] Fig. 2 It is the overall structure cross section schematic view of an embodiment of the utility model;

[0020] Fig. 3 It is the transmission assembly cross section schematic view of an embodiment of the utility model;

[0021] Fig. 4 It is the partial structure axial side view of an embodiment of the utility model;

[0022] Fig. 5 It is the gear seat overall structure axial side view of an embodiment of the utility model;

[0023] In the drawing: 1, motor shell;2, driving motor;3, motor seat;4, bearing main body one;5, main gear shaft;6, gear seat;61, shaft insertion slot one;62, gear containing cavity;63, shaft insertion slot two;64, gear installation shaft;7, bearing main body two;8, driven gear;9, gear sleeve;10, bearing main body three;11, elbow connecting hexagonal shaft;12, motor elbow;121, elbow connecting seat;122, connecting sleeve;123, driving bevel gear;124, driven bevel gear;125, output main shaft;13, sealing screw. DETAILED DESCRIPTION

[0024] The preferred embodiments of the utility model are described in detail below in combination with the drawings, so that the advantages and characteristics of the utility model can be more easily understood by the person skilled in the art, and the protection scope of the utility model is more clearly and explicitly defined.

[0025] Referring to the drawings Figs. 1 to 5 The electric polishing tool for narrow space in the embodiment comprises a driving assembly, a driving end of the driving assembly is connected with the motor elbow 12 through a transmission assembly, when the driving end of the driving assembly rotates, the transmission assembly can drive the grinding base on the motor elbow 12 to rotate to polish the workpiece, and a hexagonal shaft 11 connected with the elbow; the transmission assembly comprises a main gear shaft 5, a gear seat 6, and a gear sleeve 9 sleeved on the gear seat 6 and connected with the gear seat 6 through a bearing body 2, the gear seat 6 can rotate relative to the gear sleeve 9 through the bearing body 2, specifically, the bearing body 2 is arranged on one end of the gear seat 6 close to the driving assembly, and the outer periphery of the bearing body 2 is in contact with the inner wall of one side of the gear sleeve 9 close to the driving assembly, in addition, the bearing body 2 can also support the arrangement of the gear seat 6 to avoid the outer periphery of the gear seat 6 directly contacting the gear sleeve 9 to affect the rotation of the gear sleeve 9;

[0026] One end of the main gear shaft 5 is rotationally connected in the gear seat 6, and the other end is fixedly connected with the driving end of the driving assembly, when the driving assembly is turned on, the driving end can drive the main gear shaft 5 to rotate, after the main gear shaft 5 is rotationally connected with the gear seat 6, the axial surface of the main gear shaft 5 is not connected with the gear seat 6, that is, each part of the main gear shaft 5 is not in contact with the gear seat 6, so as not to affect the rotation of the gear seat 6 with the main gear shaft 5 as the axis;

[0027] The gear seat 6 is pivotally connected with at least one driven gear 8 engaged with the main gear shaft 5 and the gear sleeve 9, when the driving end of the driving assembly drives the main gear shaft 5 to rotate, the driven gear 8 engaged with the main gear shaft 5 also rotates correspondingly, wherein the driven gear 8 is rotatably connected on the gear seat 6 and is also engaged with the gear sleeve 9, therefore, the driven gear 8 can rotate around the main gear shaft 5 along the inner teeth of the inner wall of the gear sleeve 9 while rotating itself, thereby driving the gear seat 6 to rotate as a whole, and the rotation is transmitted to the motor elbow 12 through the hexagonal shaft 11 connected with the elbow;

[0028] The rotation speed of the driving end of the driving assembly is reduced through the transmission of the main gear shaft 5, the gear sleeve 9 and the driven gear 8, and when connected with the motor elbow 12, the torque of the motor elbow 12 can be effectively increased, so that the motor elbow 12 has better polishing performance;

[0029] Compared with the electric polishing tool used in the prior art, the upper driving part always keeps a high rotating speed, which makes the electric polishing tool generate high heat. Therefore, a heat dissipation mechanism is additionally provided at the polishing base of the polishing tool, and a heat dissipation channel is additionally provided in the polishing tool to avoid affecting the polishing work, which leads to an excessively large overall size, and the polishing base cannot enter a narrow space to polish a workpiece. In the present application, the speed reduction mechanism of the main gear shaft 5, the gear seat 6 and the driven gear 8 is provided, which solves the heat dissipation problem without affecting the motor elbow 12 and the polishing base thereon, and reduces the overall size and weight of the electric polishing tool, so that the electric polishing tool can enter a narrow space for use, the operation is more convenient, and the applicability is stronger.

[0030] The elbow connecting hexagonal shaft 11 connects the transmission assembly and the motor elbow 12, and is fixedly inserted into one end of the gear seat 6 away from the driving assembly. Specifically, when the driving end of the driving assembly drives the main gear shaft 5 to rotate, the driven gear 8 engaged with the main gear shaft 5 rotates, and the driven gear 8 is also engaged with the gear sleeve 9. That is, the driven gear 8 as a whole rotates along the inner teeth of the inner wall of the gear sleeve 9 with the main gear shaft 5 as the axis, and further drives the gear seat 6 pivotally connected thereto to rotate as a whole. In the transmission process, the gear speed is reduced to increase the torque of the motor elbow 12 connected with the gear seat 6 through the elbow connecting hexagonal shaft 11.

[0031] The driving assembly includes a motor shell 1 and a driving motor 2 located in the shell. One side of the motor shell 1 close to the driving end of the driving motor 2 is locked on the motor seat 3 by a fastening screw, and the transmission assembly is located in the motor seat 3.

[0032] That is, the inside of the motor seat 3 has a limited space for the transmission assembly.

[0033] The driving end of the driving assembly, the main gear shaft 5, the gear seat 6 and the elbow connecting hexagonal shaft 11 are coaxially arranged. When the driving assembly is driven, the driving end and the main gear shaft 5 have no vibration, and the main gear shaft 5 requires small bearing. The main gear shaft 5 is connected with the inner wall of the motor seat 3 through the bearing body one 4.

[0034] In some embodiments, the driving end of the driving assembly is provided with a spline, and the spline is fixedly inserted into one end of the main gear shaft 5 away from the motor elbow 12.

[0035] The main gear shaft 5 is connected with the inner wall of the motor seat 3 through the bearing body one 4, and the bearing body one 4 is a single row bearing. Since the driving end of the driving motor 2 and the main gear shaft 5 are coaxially arranged, there is no vibration between them. Therefore, the single row bearing can bear the rotation of the main gear shaft 5. Compared with the double row bearing in the existing electric polishing tool, the single row bearing has smaller size, thinner thickness and lower cost, and further reduces the overall size and production cost of the electric polishing tool.

[0036] In some embodiments, the bearing body 4 is provided with a concentric bearing spring on each side.

[0037] The gear seat 6 is provided with an axis slot 61 and an axis slot 63 coaxial with the gear seat 6 at both ends of the length direction. The upper gear segment of the main gear shaft 5 is at least partially located in the axis slot 61 and engaged with the driven gear 8. The elbow connecting hexagonal shaft 11 is at least partially inserted into the axis slot 63. This ensures the stability of the connection between the motor elbow 12 and the transmission assembly and the transmission of the transmission assembly.

[0038] In some embodiments, the axis slot 61 and the axis slot 63 are not connected to each other, so as to avoid interference between the main gear shaft 5 and the elbow connecting hexagonal shaft 11 when they are inserted.

[0039] The gear seat 6 is provided with a gear accommodating cavity 62 at both ends of the length direction of the axis slot 61. Each gear accommodating cavity 62 is rotatably connected with the driven gear 8 through the gear mounting shaft 64 horizontally fixed thereon. In some embodiments, two driven gears 8 are provided and located at both sides of the length direction of the main gear shaft 5, so as to improve the stability of the rotation of the gear seat 6. The gear mounting shaft 64 can support the driven gear 8, and the driven gear 8 is specifically located in the limited space formed between the inner wall of the gear sleeve 9 and the gear seat 6.

[0040] In other embodiments, the gear mounting shaft 64 penetrates the axis of the driven gear 8 and is fixedly connected with the driven gear 8. The two ends of the gear mounting shaft 64 are rotatably connected with the gear seat 6. This structure can also improve the stability of the rotation of the gear seat 6.

[0041] The end of the gear seat 6 connected with the elbow connecting hexagonal shaft 11 is connected with the inner ring of the connecting sleeve 122 through the bearing body 3, and a sealing ring is installed between the outer ring of the connecting sleeve 122 and the sealing screw 13 locked on the gear seat 6. The connecting sleeve 122 can protect the end of the gear seat 6 connected with the motor elbow 12. The bearing body 3 is arranged to prevent the connecting sleeve 122 from interfering with the rotation of the gear seat 6. This ensures the stability of the transmission between the gear seat 6 and the motor elbow 12.

[0042] The inner wall of the gear sleeve 9 is circumferentially provided with a plurality of internal teeth parallel to the direction of the central axis thereof, and the outer surface of the gear sleeve 9 is provided with external threads in the axial direction. The driven gear 8 is engaged with the internal teeth, and when the main gear shaft 5 rotates, the driven gear 8 can move along the internal teeth.

[0043] The motor elbow 12 further comprises an elbow connecting seat 121 connected with the motor seat 3 by connecting screws and a conversion assembly located in the elbow connecting seat 121.

[0044] The conversion assembly comprises a driving bevel gear 123 and a driven bevel gear 124 perpendicular to the driving bevel gear 123, the driving bevel gear 123 is fixedly inserted with the elbow connecting hex shaft 11 at an end away from the driven bevel gear 124, the driven bevel gear 124 is fixedly connected with an output main shaft 125 extending to the outside of the elbow connecting seat 121 at an end away from the driving bevel gear 123, and the output main shaft 125 is installed with a grinding base. When the gear seat 6 rotates, the elbow connecting hex shaft 11 inserted with the gear seat 6 rotates to drive the driving bevel gear 123 to rotate, the driven bevel gear 124 meshes with the driving bevel gear 123, so that the grinding base rotates to polish the workpiece.

[0045] In some embodiments, the output main shaft 125 is perpendicular to the gear seat 6, that is, the output main shaft 125 is arranged in a 90-degree bending mode, so that the grinding base on the output main shaft 125 can be conveniently extended into a narrow space for polishing.

[0046] The above embodiments are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and cannot limit the protection scope of the present application, and any equivalent changes or modifications made according to the spirit and essence of the present application should be covered within the protection scope of the present application.

Claims

1. A power sander for use in tight spaces, comprising a drive assembly, the drive assembly drive end connected to a motor elbow via a transmission assembly, characterised in that: It also includes a hexagonal shaft with an elbow; the transmission assembly includes a main gear shaft, a gear seat, and a gear sleeve fitted on the gear seat and connected to it through a bearing body two. One end of the main gear shaft is anti-rotatingly connected inside the gear seat, and the other end is fixedly connected to the driving end of the drive assembly. At least one driven gear that meshes with both the main gear shaft and the gear sleeve is pivotally connected to the gear seat. The hexagonal shaft with an elbow connects the transmission assembly and the motor elbow, and it is fixedly inserted into the end of the gear seat away from the drive assembly.

2. The electric sander for a narrow space according to claim 1, wherein: The drive assembly includes a motor housing and a drive motor located inside the housing. The side of the motor housing near the drive end of the drive motor is fastened to the motor base by fastening screws. The transmission assembly is located inside the motor base.

3. The electric sander for a narrow space according to claim 1, wherein: The drive end, main gear shaft, gear seat, and elbow-connected hexagonal shaft of the drive assembly are all coaxially arranged.

4. The power sander for use in a tight space according to claim 2, wherein: The main gear shaft is connected to the inner wall of the motor base through a bearing body, which is a single-row bearing.

5. The power sander for use in a tight space according to claim 1, wherein: The gear seat has a shaft slot 1 and a shaft slot 2 coaxially located at both ends along its length. At least part of the gear segment on the main gear shaft is located in the shaft slot 1 and meshes with the driven gear. At least part of the bent hexagonal shaft is interference-fitted with the shaft slot 2.

6. The power sander for use in a tight space according to claim 5, wherein: The gear seat has a gear receiving cavity on each side of the shaft slot along a length direction. Each gear receiving cavity is rotatably connected to the driven gear through a gear mounting shaft that is horizontally fixed thereon.

7. The power sander for use in tight spaces of claim 1, wherein: One end of the gear seat that is connected to the elbow is connected to the inner ring of the connecting sleeve through the bearing body three. A sealing ring is installed between the outer ring of the connecting sleeve and the sealing screw locked on the gear seat.

8. The power sander for tight spaces of claim 1, wherein: The inner wall of the gear sleeve has a circumferential array of several internal teeth parallel to the direction of its central axis, and the outer circumferential surface of the gear sleeve is provided with external threads along its axial direction.

9. The power sander for use in tight spaces of claim 1, wherein: The motor elbow also includes an elbow connector and a conversion assembly. The elbow connector is connected to the motor base by connecting screws, and the conversion assembly is located inside the elbow connector.

10. The power sander for use in a tight space according to claim 9, wherein: The conversion assembly includes a driving helical gear and a driven helical gear perpendicular to it. The end of the driving helical gear away from the driven helical gear is fixedly inserted into the elbow connecting hexagonal shaft. The end of the driven helical gear away from the driving helical gear is fixedly connected to an output spindle extending to the outside of the elbow connecting seat. A grinding chassis is mounted on the output spindle.

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