CN110039442B - Polishing tool - Google Patents

Polishing tool Download PDF

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Publication number
CN110039442B
CN110039442B CN201910036552.0A CN201910036552A CN110039442B CN 110039442 B CN110039442 B CN 110039442B CN 201910036552 A CN201910036552 A CN 201910036552A CN 110039442 B CN110039442 B CN 110039442B
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CN
China
Prior art keywords
motor
bottom plate
intermediate shaft
assembly
base plate
Prior art date
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Active
Application number
CN201910036552.0A
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Chinese (zh)
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CN110039442A (en
Inventor
张士松
钟红风
孙益民
吉绍山
朱爱民
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Positec Power Tools Suzhou Co Ltd
Original Assignee
Positec Power Tools Suzhou Co Ltd
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Publication date
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Publication of CN110039442A publication Critical patent/CN110039442A/en
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00Portable grinding machines, e.g. hand-guided; Accessories therefor
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/005Auxiliary devices used in connection with portable grinding machines, e.g. holders
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/02Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B41/00Component parts such as frames, beds, carriages, headstocks
    • B24B41/007Weight compensation; Temperature compensation; Vibration damping
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B41/00Component parts such as frames, beds, carriages, headstocks
    • B24B41/02Frames; Beds; Carriages
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B55/00Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B55/00Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
    • B24B55/02Equipment for cooling the grinding surfaces, e.g. devices for feeding coolant

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Abstract

The invention relates to a polishing tool, which belongs to the field of electric tools and comprises a main body part and a bottom plate assembly arranged on the main body part, wherein the main body part comprises a shell, a motor and an intermediate shaft biased at one side of the motor, the shell comprises a main shell for accommodating the motor and the intermediate shaft, the bottom plate assembly is arranged at the lower end of the intermediate shaft, the motor drives the bottom plate assembly to enable the bottom plate assembly to conduct polishing work, the bottom plate assembly comprises a polishing bottom plate for polishing work, the polishing tool further comprises an energy supply assembly for supplying energy to the motor, the axis of the intermediate shaft is arranged at intervals with the axis of the motor, and the motor and the energy supply assembly are distributed at two sides of the intermediate shaft. The polishing tool can avoid the gravity center of the whole machine from deviating to one side, so that the bottom plate assembly vibrates little during working, and the polishing tool is easy to put in a standing state, avoids toppling over and is more comfortable during operation.

Description

Polishing tool
Technical Field
The invention relates to a polishing tool, and belongs to the field of electric tools.
Background
Existing sanding machines include round sanders, flat sanders, and the like, wherein the jackshaft sanding floor of the round sander generally operates about the axis of the jackshaft for grinding a relatively large amount of material, such as for rough grinding. The self-transmission movement of the sanding sole plate of the flat sanding is limited, so that the sanding sole plate is essentially in plate sanding movement about the axis of the intermediate shaft, i.e. can only perform orbital movement in a revolution-regular manner, suitable for grinding smaller amounts of material, for example for fine machining or finishing.
The sander generally comprises a main body and a base plate assembly arranged on the main body, wherein the main body comprises a motor, an intermediate shaft connected with the motor, a main shell for accommodating the motor and the intermediate shaft, a holding shell arranged on one side of the main shell, and a power supply device for supplying electric energy to the sander. Because the motor normally takes up about 1/3 of the weight of the whole sanding machine, the existing sanding machine generally has the phenomenon of unbalanced weight, when the sanding machine is placed still, the sanding machine can topple over, and when the sanding machine is started, because of the problem of unbalanced weight, people are often required to increase the control force to prevent the sanding machine from tilting to one side.
Disclosure of Invention
The invention aims to provide a polishing tool which is easy to put and more comfortable to operate.
In order to achieve the above purpose, the present invention provides the following technical solutions: the utility model provides a polishing tool, includes the main part and sets up bottom plate subassembly in the main part, the main part include casing, motor, offset in jackshaft on one side of the motor, the casing including being used for accomodating the motor with the main casing of jackshaft, bottom plate subassembly set up in the lower extreme of jackshaft, motor drive bottom plate subassembly so that bottom plate subassembly carries out polishing work, bottom plate subassembly includes the polishing bottom plate of polishing work, polishing tool is still including being used for the energy supply subassembly of motor energy supply, the axis of jackshaft with the axis interval setting of motor, just the motor with energy supply subassembly distributes the both sides of jackshaft.
Further, the shell further comprises a holding shell which is arranged at one end of the main shell close to the intermediate shaft and is arranged at an angle with the main shell, and the energy supply assembly and the main shell are distributed at two ends of the holding shell.
Further, the motor and the holding housing are distributed on both sides of the intermediate shaft.
Further, the center of gravity of the main body portion is located between the axis of the motor and the axis of the intermediate shaft.
Further, the energy supply assembly is a battery pack, the mass of the battery pack is between 333g and 630g, and the gravity center of the polishing tool is positioned on one side far away from the motor, and the projection in the direction of the polishing bottom plate falls into the polishing bottom plate.
Further, the energy supply assembly is a battery pack, the mass of the battery pack is 333g to 630g, the center of gravity of the polishing tool is located on one side, away from the motor, of the intermediate shaft, and the projection in the direction of the polishing bottom plate falls into the polishing bottom plate.
Further, the energy supply assembly is a battery pack, the mass of the battery pack is larger than 333g, and as the mass of the battery pack increases, the gravity center of the polishing tool gradually moves from a position between the axis of the motor and the axis of the intermediate shaft to a direction approaching the battery pack.
Further, the axis of the intermediate shaft is parallel to the axis of the motor.
Further, the bottom plate assembly comprises a bottom plate rotating shaft which can be driven to rotate by a motor, the polishing bottom plate is driven to polish by the bottom plate rotating shaft, the rotating axis of the bottom plate rotating shaft is coaxial with the axis of the intermediate shaft, the axis of the intermediate shaft is arranged at intervals with the axis of the motor, and the motor and the holding shell are distributed on two sides of the intermediate shaft.
Further, a distance from an end of the main housing remote from the grip housing to an end of the main housing connected to the grip housing is between 70mm and 80 mm.
Further, a distance from an end of the main body portion where the main housing is located to an end of the main body portion remote from the main housing is between 185mm and 220 mm.
Further, the bottom plate assembly is detachably mounted on the main body portion, and the bottom plate assembly is any one of a round sand bottom plate assembly and a plate sand bottom plate assembly.
Further, the sanding tool also includes a spacing foot located between the body portion and the floor assembly, the spacing foot being selectively connectable with the floor assembly to limit rotational movement of the sanding floor of the floor assembly about the axis of the intermediate shaft.
Further, the main body part further comprises a torque output part for transmitting the power of the motor to the bottom plate assembly and a transmission part for transmitting the power of the motor to the torque output part, the transmission part comprises a first transmission wheel driven by the motor and a second transmission wheel driven by the first transmission wheel, and the rotation axis of the first transmission wheel and the rotation axis of the second transmission wheel are arranged at intervals.
Further, the main body part also comprises a second fan which is fixedly arranged opposite to the second driving wheel and can cool the second driving wheel, and a first fan which is coaxially arranged with the motor and is positioned at one end of the motor close to the polishing part and can cool the motor.
Further, at least one air inlet and at least one air outlet are formed in the shell, the at least one air inlet is close to the motor, the at least one air outlet is close to the second fan, external air flows through the motor from the air inlet close to the motor under the action of the first fan, and flows out from the air outlet close to the second fan under the action of the second fan.
The invention has the beneficial effects that: according to the polishing tool, the axis of the intermediate shaft and the axis of the motor are arranged at intervals, and the motor and the energy supply assembly are arranged on two sides of the intermediate shaft, so that the gravity center of the whole sander is prevented from being deviated to one side, the gravity center of the sander can be closer to the vicinity of the intermediate shaft during working, the vibration of the bottom plate assembly is small during working, and the operation is more comfortable; and the polishing tool is easy to put in a static state, so that the polishing tool is prevented from toppling over.
The foregoing description is only an overview of the present invention, and is intended to provide a better understanding of the present invention, as it is embodied in the following description, with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
Fig. 1 is a schematic view of the whole structure of a sander according to a preferred embodiment of the present invention, in which a battery is not installed and a dust collecting device is installed.
Fig. 2 is a schematic diagram of the gravity center position of the whole machine when the sander is provided with the first type of battery pack.
Fig. 3 is a schematic diagram of the gravity center position of the sander when the battery pack is not installed.
Fig. 4 is a schematic diagram of the center of gravity position of the whole machine when the sander is provided with a second type of battery pack.
Fig. 5 is a schematic diagram of the center of gravity position of the whole machine when the sander is provided with a third type of battery pack.
Fig. 6 is a schematic view of the structure of the sander when the sander is placed with the placement plate of the battery pack as the placement surface.
Fig. 7 is a schematic view of the sander of fig. 1 with the main housing of the uninstalled portion.
Fig. 8 is a partially exploded view of the sander shown in fig. 1.
Fig. 9 is an exploded view of the sander shown in fig. 1.
Fig. 10 is a schematic view of a portion of the spacing mechanism of fig. 1.
Fig. 11 is an enlarged view of circle a in fig. 8.
Fig. 12 is a cross-sectional view of the mated state of the body and floor assembly of fig. 1.
FIG. 13 is a schematic view of the locking mechanism of FIG. 1;
fig. 14 is a schematic view of the operating member of fig. 1.
Detailed Description
The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
Referring to fig. 1, 7 and 8, the polishing tool in the present embodiment is exemplified by a multifunctional sander 100 (hereinafter referred to as sander 100), the sander 100 can replace different base plate assemblies 20, and the sander 100 includes a main body 10, a base plate assembly 20 detachably disposed below the main body 10, and an operating member 30 rotatably disposed on the main body 10. Referring to fig. 1, the direction a-a is the up-down direction of the sander 100, wherein the position of the base plate assembly 20 is defined as the lower part of the entire sander 100. The main body 10 includes a motor 11, an intermediate shaft 12 offset to one side of the motor 11, a main housing 13 for housing the motor 11 and the intermediate shaft 12, and a grip housing 14 provided at an end of the main housing 13 remote from the motor 11. The floor assembly 20 is mounted to the underside of the intermediate shaft 12, and specifically, the main body 10 is coupled to the floor assembly 20 via the intermediate shaft 12 and a threaded rod 41 (see fig. 8) disposed within the intermediate shaft 12, and the principle of the specific coupling of the main body 10 to the floor assembly 20 will be described later. The motor 11 drives the floor assembly 20 to move so that the floor assembly 20 performs a polishing work, and the floor assembly 20 has a polishing floor 221 for performing the polishing work. In the present embodiment, the main housing 13 and the holding housing 14 are injection molded, and the main housing 13 and the holding housing 14 are formed as an integral structure and are divided into two halves along the longitudinal direction of the sander 100, that is, the main housing 13 is composed of two half housings that are substantially symmetrical. The holding shell 14 is disposed at one end of the main shell 13 near the intermediate shaft 12, the holding shell 14 and the main shell 13 are disposed at an angle, in this embodiment, the holding shell 14 includes a holding handle 141 for holding and a holding cavity 142 for holding and bending fingers, the holding handle 141 is located at an upper side of the holding cavity 142, i.e. the holding handle 141 is located at a side far from the base plate assembly 20 in the a-a direction. The grip housing 14 is disposed at an angle of substantially 90 degrees with respect to the main housing 13 (the term "angle" as used herein refers to an angle between an extending direction of the grip handle 14 and an axial extending direction of the main housing 13 along the axis X1 of the motor 11). The axis X0 of the intermediate shaft 12 is spaced from the axis X1 of the motor 11, and the motor 11 and the grip housing 14 are distributed on both sides of the intermediate shaft 12.
Referring to fig. 2, in order to conveniently supply power to the main body 10, a power supply assembly is disposed on a side of the grip housing 14 away from the main housing 13, and the power supply assembly and the motor 11 are disposed on both sides of the intermediate shaft 12. The axis X0 of the intermediate shaft 12 and the axis X1 of the motor 11 are arranged at intervals, and the motor 11 and the energy supply assembly are arranged on two sides of the intermediate shaft 12, so that the gravity center of the whole sander 100 is prevented from being deviated to one side, the gravity center of the sander 100 can be closer to the vicinity of the intermediate shaft 12 when the sander works, and the base plate assembly 20 has small vibration and more comfortable operation when the sander works; and the polishing tool is easy to put in a static state, so that the polishing tool is prevented from toppling over. It is understood that the power supply assembly may be powered by ac or dc power, such as a battery assembly or a battery pack. In this embodiment, a power supply mode in which the power supply assembly adopts a battery pack is specifically described as an example. The end of the grip housing 14 remote from the main housing 13 in this embodiment is provided with a battery pack mounting portion 17 of the battery pack 16. Referring specifically to fig. 1, the battery pack mounting portion 17 is provided with a guide rail 171 for mounting the battery pack 16, and an electrode tab 172 electrically connected to the battery pack 16. It will be appreciated that the battery pack 16 is provided with guide grooves (not shown) for mating with guide rails of the battery pack mounting portion 17 and electrode tab slots (not shown) for mating with electrode tabs, although it will be appreciated that the electrode tabs 172 may be provided on the battery pack while the electrode tab slots are provided on the battery pack mounting portion 17.
Referring to fig. 3, when the battery pack 16 is not mounted to the main body 10, the center of gravity G3 of the main body 10 is located between the axis X1 of the motor 11 and the axis X0 of the intermediate shaft 12. Referring to fig. 2, when the battery pack 16 is mounted on the main body 10 and the mass of the battery pack 16 is greater than 333g, the center of gravity of the sander 100 gradually moves from a position between the axis X1 of the motor 11 and the axis X0 of the intermediate shaft 12 toward the battery pack 16 as the mass of the battery pack 16 increases. Referring to fig. 4, when the battery 16 is included with a mass between 333g and 630g, the center of gravity of the sander 100 is located on the side of the intermediate shaft 12 away from the motor 11 and the projection in the direction of the sanding floor 221 of the floor assembly 20 falls within the sanding floor 221. Referring to fig. 5, when the mass of the battery pack 16 is 630g or more, the center of gravity of the sander 100 is located on the side of the intermediate shaft 12 away from the motor 11, and the projection of the center of gravity of the sander 100 in the direction of the sanding floor 221 of the floor assembly 20 falls outside the area of the sanding floor 221 of the floor assembly 20, the sander 100 is tilted toward the battery pack 16 side when the sander 100 is placed with the surface of the sanding floor 221 as the placement surface.
Since the motor 11 and the grip housing 14 are located on both sides of the intermediate shaft 12, and the power feeding unit (battery pack 16) and the main housing 13 are located on both ends of the grip housing 14, the corresponding motor 11 and battery pack 16 are provided on both ends of the sander 100, respectively, and the motor 11 is regarded as a front end and the battery pack 16 is regarded as a rear end when the view angle is based on fig. 2. Since the main weight of the sander 100 comes from the motor 11 and the energy supply assembly (the battery pack 16), the center of gravity of the motor 11 and the center of gravity of the energy supply assembly (the battery pack 16) have a large influence on the center of gravity of the sander 100, for example, the center of gravity of the motor 11 is defined as G1, the center of gravity of the energy supply assembly (the battery pack 16) is defined as G2, the center of gravity of the sander 100 is defined as G3, the distance from the center of gravity G1 of the motor 11 to the center of gravity of the sander 100 is defined as a1, the distance from the center of gravity G2 of the energy supply assembly (the battery pack 16) to the center of gravity of the sander 100 is defined as a2, in order to ensure the balance of the sander, prevent toppling during standing, and bring about good operation experience, the center of gravity of the sander 100 satisfies the following formula (the formula is named as "center formula"): the weight of motor 11a 1 is equal to or about equal to the weight of energizing assembly 16 (battery pack 16) a2.
In this embodiment, the battery pack 16 is detachably connected to the grip housing 14. It will be appreciated that the battery pack 16 may also be a non-removable energy storage battery pack 16. Since the battery pack 16 is removable, and typically, the sander 100 can be assembled with different battery packs 16 as required by the operating time. Typically the mass selection of the battery pack 16 is between 333g and 630 g; the battery pack 16 is configured to have any one of a voltage of 20V, a capacity of 2Ah, a voltage of 20V, a capacity of 4Ah, and a voltage of 20V, a capacity of 6 Ah. Because the battery pack 16 is changeable in weight, and the sander 100 is basically fixed in weight of the motor 11 after shipment, the center of gravity of the sander 100 is not fixed depending on the size of the capacity of the battery pack 16 mounted, as shown in fig. 3, when the battery pack 16 is not mounted in the whole machine, the center of gravity G3 of the sander 100 falls near the center of gravity G1 of the motor 11, as shown in fig. 2, when the battery pack 16 of 2Ah is mounted in the whole machine (for example, the battery pack 16 of 20V, 2Ah is about 370G in weight), the center of gravity G3 of the sander 100 falls at a position on the rear side of the intermediate shaft 12, as shown in fig. 4, and when the battery pack 16 of 4Ah is mounted in the whole machine (for example, the battery pack 16 of 20V, 4Ah is about 630G in weight), the center of gravity G3 of the sander 100 falls again at a position further rearward than the intermediate shaft 12, as a whole, and the center of gravity G3 of the sander 100 is in direct proportion to the capacity of the battery pack 16. However, when the battery pack 16 reaches 6Ah or more, the center of gravity G3 of the sander 100 will be gradually located away from the intermediate shaft 12, thereby creating an unbalanced condition for the machine, which is prone to a rollover condition as shown in fig. 5. In this way, damage to the tool or the work surface will occur. Therefore, instructional advice on selecting the battery pack 16 can be given by the "gravity center formula".
In order to more precisely set the position of the center of gravity G3 of the sander 100, a range of positions of the center of gravity of the sander 100 needs to be defined, when the sanding bottom plate 221 is used as a supporting plane, and when the center of gravity G3 of the sander 100 falls in the sanding bottom plate 221 as a supporting plane B-B, the whole sander can be kept in a balanced state, and a normal placing condition without toppling is shown, as shown in fig. 2 to 4; when the center of gravity G3 of the sander 100 falls outside the supporting plane B-B with the sanding bottom plate 221, the entire machine cannot be balanced, and the machine will be tilted to a side-turned state, as shown in fig. 5, which is not beneficial for the user to replace the bottom plate assembly 20 of the sander. In this embodiment, the battery pack 16 includes the placement plate 161 disposed away from the motor, and in actual use, the placement plate 161 may also be used as a supporting surface, and when the placement plate 161 of the battery pack 16 is used as a supporting plane, as shown in fig. 6, the center of gravity G3 of the sander 100 still falls within the range of the supporting plane (placement plate 161) of the battery pack 16, and the entire machine may still be placed in a balanced state.
Referring to fig. 2 and 3, in order to facilitate the operation and to be suitable for the hand-held operation, the main portion of the main body 10 in this embodiment is preferably sized in such a way that the distance K1 from the end of the main housing 13 remote from the grip housing 14 to the end connected to the grip housing 14 is between 70mm and 80 mm. The distance K2 from the end of the holding chamber 142 near the main housing 13 to the end of the holding chamber 142 near the battery pack mounting portion 17 (i.e., the axial length of the holding chamber 142) is between 90mm and 105mm for easy holding. The distance K3 between the end of the holding chamber 142 near the battery pack mounting portion 17 and the side of the battery pack mounting portion 17 away from the main casing 13 is between 25mm and 35mm to facilitate fixing the battery pack 16 and to make the strength of the battery pack mounting portion 17 appropriate. Thus, the end of the main housing 13 of the main body 10 means that the distance of the end of the main body 10 remote from the main housing 13 is between 185mm and 220mm, i.e. the overall length of the main body 10 is between 185mm and 220 mm.
Preferably, K1 is between 71.3mm and 78.8mm, K2 is between 90.3mm and 99.8mm, and K3 is between 28.5mm and 31.5mm, i.e. the length of the body portion 10 is between 190.1mm and 210 mm. More preferably, K1 is 75mm, K2 is 95mm, and K3 is 30mm.
Referring to fig. 7 to 9, in the present embodiment, an axis X0 of the intermediate shaft 12 is parallel to an axis X1 of the motor 11, and the main body 10 includes a torque output portion for transmitting power of the motor 11 to the base plate assembly 20 and a transmission portion 15 for transmitting power of the motor 11 to the torque output portion, so that the base plate assembly 20 is moved by the motor 11 to perform polishing work. The constitution of the transmission portion 15 in the present embodiment will be described first. The transmission part 15 includes a first transmission wheel 151 coaxially provided with the motor 11 and driven to rotate by the motor 11, and a second transmission wheel 152 coaxially provided on the intermediate shaft 12 and driven by the first transmission wheel 151. The rotation axis of the first transmission wheel 151 and the rotation axis of the second transmission wheel 152 are spaced apart. In order to reduce noise and vibration of the first and second driving wheels 151 and 152 at the time of torque transmission, it is preferable that power transmission is performed between the first and second driving wheels 151 and 152 by means of a driving belt 153. In order to make the transmission between the transmission belt 153 and the first transmission wheel 151 and the second transmission wheel 152 stable, and avoid slipping, etc., the transmission end surfaces of the first transmission wheel 151 and the second transmission wheel 152 in this embodiment are respectively provided with ratchet teeth (not numbered), and corresponding ratchet teeth (not numbered) are provided on the transmission surface (not numbered) of the transmission belt 153 and the transmission surface (not numbered) of the transmission belt. In this embodiment, the intermediate shaft 12 is used to support the second transmission wheel 152, and in other embodiments, the second transmission wheel 152 of the transmission part 15 may not be disposed on the intermediate shaft 12, and may be disposed directly in the main housing 13 or on another shaft supported in the housing. In the present embodiment, the intermediate shaft 12 is vertically provided in the main casing 13 by upper and lower pairs of bearings (not numbered) so that the intermediate shaft 12 can rotate relative to the main casing 13. In this embodiment, the intermediate shaft 12 and the second driving wheel 152 may be connected by interference fit or key, so that the intermediate shaft 12 may be driven to rotate relative to the main housing 13 when the second driving wheel 152 rotates, in other embodiments, the intermediate shaft 12 may be disposed so as not to rotate relative to the main housing 13, may be fixed on the main housing 13, and the connection between the intermediate shaft 12 and the second driving wheel 152 may be fixed by a bearing or the like so that the second driving wheel 152 may rotate relative to the intermediate shaft 12.
Since the base plate assembly is a replaceable component, it may be any one of a plate sand base plate assembly, a round sand base plate assembly (see the base plate assembly schematically shown in fig. 2-3), and a special-shaped sand base plate assembly, wherein the plate sand base plate assembly includes a 1/4 sand base plate assembly, a 1/3 sand base plate assembly (see the base plate assembly of fig. 9), and a triangular sand base plate assembly or a special-shaped sand base plate assembly, etc., that is, the base plate assembly requiring limiting the rotation movement of the polishing base plate when the base plate assembly 20 works is called a plate sand base plate assembly. The operator can selectively connect the base plate assembly 20 with the main body 10 according to different polishing requirements. However, regardless of the base plate assembly 20, referring to fig. 8, the base plate assembly 20 includes a bearing 21, a base plate housing 22 located outside the bearing 21, and a base plate rotating shaft 23 connected to the inside of the bearing 21. The base plate housing 22 includes a base plate bracket (not numbered) fixed to the outer ring of the bearing 21 and a sanding base plate 221 positioned below the base plate bracket, and sandpaper may be installed below the sanding base plate 221 to complete a sanding operation by the sandpaper. If the base plate assembly 20 is a round sand base plate assembly, the polishing base plate is round; if the base plate component is a plate sand base plate component, the polishing base plate is rectangular, triangular or other non-return side shapes. The sanding sole plate of the circular sanding sole plate assembly is revolved while being sanded, and at the same time, the sanding sole plate is rotated by the combined action of the bearing 21 and the sole plate rotating shaft 23, that is, the sanding sole plate is rotated and revolved in orbital motion, so that the sanding sole plate 221 can be mounted to the main body part 10 when an operator needs to remove a large amount of grinding material. Referring to fig. 8, after the main body 10 and the base assembly 20 are assembled, the base shaft 23 is coaxial with the axis of the intermediate shaft 12, the base shaft 23 is driven to rotate by the second driving wheel 152, the bearing 21 is located between the base shaft 23 and the base support, the outer ring of the bearing 21 is fixed to the base support, and the inner ring of the bearing 21 is fixed to the base shaft 23, so that the base shaft 23 can rotate relative to the base support. Preferably, the floor shaft 23 includes an eccentric shaft section (not numbered) to drive the movement of the floor bracket and the sanding floor 221 fixedly coupled thereto by rotation of the eccentric shaft section. It will be appreciated that, since the base plate support is fixedly connected to the polishing base plate 221, the eccentric shaft section can drive the polishing base plate 221 to swing regularly when rotating relative to the base plate support, so as to achieve polishing operation. Further, since the eccentric amount e1 exists in the axis of the eccentric shaft section with respect to the axis X0 of the intermediate shaft 12, the counterweight 24 is provided on the base plate rotating shaft 23 in order to reduce the shake caused by the eccentric amount e 1.
Referring to fig. 8 and 9, it should be noted that the polishing base 221 is a board sand base assembly, and if the polishing base 221 is rotated and revolved under the action of the base rotating shaft 23, four corners of the rectangular polishing base 221 rotating at high speed are liable to be dangerous, so the sander 100 further includes a limiting mechanism 25 for limiting the rotation of the polishing base 221.
Referring to fig. 9 and 10, the stopper mechanism 25 is preferably fixed to the main body 10, and the stopper mechanism 25 includes a stopper base plate 251 and stopper legs 252 provided on the stopper base plate 251, the stopper legs 252 extending toward the main housing 13. The number of the limiting pins 252 is plural, each limiting pin 252 includes a plurality of flexible columns (not numbered), the limiting pins 252 are detachably fixed on the main housing 13 of the main body 10 through screws and the like, the plurality of flexible columns of each limiting pin 252 enclose into a hollow through hole and the through hole penetrates through the limiting substrate 251, and the hollow through hole enclosed by the plurality of flexible columns of the limiting pins 252 is a limiting hole 253. Each of the positioning pins 252 is provided with a mounting plate 254 at one end thereof away from the positioning base plate 251, and the mounting plate 254 is provided with a mounting hole (not numbered) for being engaged with a fastener such as a screw, so that an operator can screw the fastener such as a screw into the mounting hole 253 from below the positioning base plate 251. In this embodiment, the base plate assembly 20 is provided with a limiting post 27, and the limiting post 27 extends from the base plate housing 22 toward the main body 11, that is, toward the limiting leg 252 located on the main body 10, so that when the board sand base plate or the profiled sand base plate is mounted on the main body 10, the limiting post 27 can be smoothly inserted into the limiting hole 253 to prevent the grinding base plate 221 from rotating. The stopper posts 27 are formed protruding from the floor housing 22 toward the main body 10. In this embodiment, an elastic element 255 is disposed between the limiting post 27 and the limiting leg 252, and the elastic element 255 is disposed at one end of the limiting hole 253 near the limiting substrate 251. The elastic member 255 in this embodiment includes an elastic member 2551 located between the floor housing 22 and the opening of the stopper hole 253 to isolate the floor housing 22 and the stopper mechanism 25 from vibration in the up-down direction; the elastic member 255 further includes a second elastic member 2552 positioned between the stopper post 27 and the side wall of the stopper hole 253 to isolate vibration of the stopper post 27 and the stopper hole 253 in the radial direction, that is, vibration of the bottom plate housing 22 and the stopper mechanism 25 in the radial direction. Since the base plate assembly 20 of the sander 100 can be varied, the sanding base plate 221 provided with the spacing mechanism 25 includes another base plate assembly (also referred to as mouse sand or profiled sand) having a sanding base plate that is approximately iron-shaped, in addition to the 1/3 sand shape and 1/4 sand shape of the sanding base plate 221 described above. By attaching the above-described stopper mechanism 25 to the main body 10, cost can be saved.
When the limiting mechanism 25 is disposed on each base plate assembly 20, since the number of the base plate assemblies 20 to which the limiting mechanism 25 is mounted is large, a large number of limiting mechanisms are required, and the cost is high. In addition, since the fit between the elastic member 225 and the limiting hole 253 is mostly interference fit, the elastic member 225 is difficult to install, and thus, the greater the number of elastic members 225 installed, the more difficult to assemble. When the base plate assembly 20 is a sand base plate assembly, the spacing post 27 may be omitted, so that in practice, the spacing leg 252 may be selectively coupled to the base plate assembly 20 to limit the rotational movement of the sanding base plate 221 of the base plate assembly 20 about the axis X0 of the intermediate shaft 12. Referring to fig. 8 and 9, in the present embodiment, since the distance between the limiting leg 252 and the axis X0 of the intermediate shaft 12 is constant, when the motor 11 and the grip housing 14 are disposed on both sides of the axis X0 of the intermediate shaft 12 in the present embodiment, the overall mechanism of the sander 100 is more compact than that of the prior art.
Indeed, in other embodiments, the limiting pins may be disposed on the base plate assembly, and if the limiting pins are disposed on the base plate assembly, only a space for accommodating the limiting pins may be reserved on the main body portion, and when the limiting pins are specifically used, the limiting pins may be directly disposed on the base plate assembly, or the limiting mechanism in this embodiment may be mounted on the base plate assembly to form an integral structure; or the spacing leg may be separately provided as an independent component, for example, the spacing mechanism in this embodiment is provided as a separate component, so that the spacing mechanism does not belong to the main body portion nor the base plate assembly, and similarly, a space for accommodating the spacing leg is reserved on the main body portion, and the spacing post is optionally reserved on the base plate assembly (when the round sand base plate assembly is adopted, the spacing post may be optionally not provided, and when the base plate assembly is adopted, the spacing post is reserved as seen in the present embodiment), and when the base plate housing of the base plate assembly needs to be limited to perform autorotation movement around the central axis, the spacing mechanism is provided between the main body portion and the base plate assembly, that is, the spacing leg is installed between the main body portion and the base plate assembly.
As described above, the torque output portion 71 is configured to transmit the driving force of the motor 11 to the base plate assembly 20 so that the base plate assembly 20 performs the polishing operation, and in this embodiment, as shown in fig. 8 and 9, the torque output portion 71 is disposed between the base plate assembly 20 and the transmission portion 15, that is, the torque output portion 71 is disposed between the second transmission wheel 152 and the base plate assembly 20. The base plate assembly 20 is provided with a torque input portion 72 coupled with the torque output portion 71, so that the torque of the second transmission wheel 152 is transmitted to the base plate assembly 20, and the driving force of the motor 11 is transmitted to the base plate assembly 20. In the present embodiment, the torque output portion 71 is directly fixed to the second transmission wheel 152 to achieve synchronous rotation. When the base plate assembly 20 is mounted to the main body 10, the torque output portion 71 cooperates with the torque input portion 72 to effect rotation of the base plate shaft 23. Referring to fig. 9, in the present embodiment, the torque output portion 71 is preferably a first engagement tooth fixedly connected to the second driving wheel 152 and uniformly disposed in the circumferential direction, and the torque input portion 72 is preferably a second engagement tooth uniformly disposed outside the rotating shaft 23 of the base plate and capable of being engaged with the first engagement tooth. Specifically, referring to fig. 7 and 8, a fan 63 is fixed at the lower end of the intermediate shaft of the second driving wheel 152, and the fan 63 includes a ring-shaped fan base 630, a first fan blade (hereinafter referred to as a second fan 631) extending from the side surface of the fan base 630 toward the second driving wheel 151, and a second fan blade (hereinafter referred to as a third fan 632) extending from the other side surface of the fan base 630 toward the bottom plate assembly 20. The first engaging teeth are a plurality of protruding teeth arranged on the second driving wheel 152 and fixedly connected with the second driving wheel 152 or arranged on the lower end surface of the insert 64 which is fixedly connected with the fan 63 and arranged on the inner periphery of the fan 63, and the second engaging teeth are a plurality of protruding teeth which extend outwards in radial direction at the upper end of the bottom plate rotating shaft 23. It will be appreciated that the torque output 71 and the torque input 72 may be provided in other arrangements as long as a transmission of rotational movement (torque transmission) between the motor 11 and the base plate shaft 23 is enabled. In this embodiment, since the intermediate shaft 12 is preferably rotatable, the insert 64 is fixedly sleeved on the outer side of the intermediate shaft 12 to drive the intermediate shaft 12 to rotate. That is, in the present embodiment, the second transmission wheel 152 transmits the driving force of the motor 11 to the insert 64, the insert 64 transmits torque to the floor assembly 20 through the rotation transmission member, and the insert 64 simultaneously transmits the driving force of the motor 11 to the intermediate shaft 12 to rotate the intermediate shaft 12.
The above-mentioned rotation transmission member only realizes torque transmission, but the base plate assembly 20 not only needs to be capable of rotating under the drive of the rotation transmission member of the main body 10, but also needs to be connected with the main body 10 in an axial direction to realize the installation and the disassembly between the base plate assembly 20 and the main body 10. The axial fixation of the floor assembly 20 relative to the body portion 10 is achieved by providing a connection assembly.
The connecting component comprises a first connecting piece arranged on one of the main body part 10 and the bottom plate rotating shaft 23, and a second connecting piece arranged on the other of the main body part 10 and the bottom plate rotating shaft 23, wherein the second connecting piece is separated from the first connecting piece or axially connected with the first connecting piece after rotating relative to the first connecting piece, so that the bottom plate component 20 is mounted or separated from the main body part 10. Preferably, for ease of operation, the second connector is driven to rotate relative to the first connector by the operating member 30. The first connecting member may be a fixing hole provided at one of the intermediate shaft 12 and the bottom plate rotating shaft 23; the second coupling member may be a fastener coupled to the other of the intermediate shaft 12 and the floor shaft 23. Referring to fig. 8 and 9, in this embodiment, specifically, the fastener is a threaded rod 41, an external thread 411 is provided below the threaded rod 41, a fixing hole 412 is provided on the bottom plate rotating shaft 23, an internal thread (not numbered) is formed on at least a portion of an inner wall of the fixing hole 412, and an axial connection between the bottom plate assembly 20 and the main body 10 is achieved by matching the external thread 411 of the threaded rod 41 with the internal thread of the bottom plate rotating shaft 23, and the operating member 30 operatively drives the threaded rod 41 to rotate relative to the fixing hole 412 provided with the internal thread to achieve the axial connection between the threaded rod 41 and the bottom plate rotating shaft 23, that is, the axial connection between the main body 10 and the bottom plate assembly 20 is achieved. It will be appreciated that in other embodiments it is possible to provide the threaded rod 41 with a hollow threaded rod in the section that connects to the base plate shaft 23, and to provide the internal thread on the inner wall of the hollow threaded rod and the external thread on the base plate shaft 23.
Referring to fig. 8 and 11, in this embodiment, in order to facilitate the installation of the threaded rod 41, the intermediate shaft 12 is provided as a hollow shaft, the threaded rod 41 is at least partially located in the hollow shaft, and in order to prevent the threaded rod 41 from falling out of the hollow shaft, a flange 413 is provided at the upper end of the threaded rod 41. In this embodiment, in order to ensure the coaxiality of the main body 10 and the polishing portion 12, that is, the coaxiality between the rotation axes of the threaded rod 41 or the intermediate shaft 12 and the base plate rotating shaft 23 to reduce the vibration of the sander 100 during operation, the base plate rotating shaft 23 is further provided with a second supporting portion 414, preferably, the second supporting portion 414 is provided with a groove extending along the rotation axis direction, and a first supporting portion 415 having substantially the same outer diameter as the groove is formed below the intermediate shaft 12 for extending into the groove. Referring to fig. 12, the intermediate shaft 12 extends to a length L1 of the fixing hole 412, that is, the axial dimension of the first supporting portion 415 is L1, and L1 is between 4mm and 30mm, preferably L1 is between 11.25mm and 13.75mm, and more preferably L1 is 12.5mm. The first support portion 415 and the second support portion 414 (groove) are coupled with a small gap, that is, the outer diameter of the first support portion 415 is substantially the same as the outer diameter of the second support portion 414 (groove), and hereinafter referred to as a coupling diameter D1, the coupling diameter D1 is between 7mm and 12mm, preferably the coupling diameter D1 is between 8.55mm and 10.45mm, and more preferably the coupling diameter D1 is 9.5mm. It will be appreciated that when the mating diameter D1 is a specific value, the larger the mating length L1, the better the mating effect, i.e. the better the coaxiality will be. But the longer L1, the higher the overall height. In this embodiment, in order to make the mating length smaller, the coaxiality of the whole machine can still be well ensured, the main body 10 is provided with an abutting end face 416 abutting against the upper end face of the bottom plate rotating shaft 23, and the diameter D2 of the abutting end face 416 is larger than D1. In the present embodiment, the abutment end surface 416 is an end surface where the torque input portion 71 abuts against the bottom plate rotation shaft 23, and it is understood that in other embodiments, the abutment end surface 416 may be an end surface fixedly connected to the torque output portion 71 and abutting against the bottom plate rotation shaft 23. In this embodiment, the ratio of the mating length L1 to the mating diameter D1 is reduced to 0.33 by adopting the large end face for the mating, which can ensure that the mating length L1 is reduced when D1 is a specific value, and of course, it can be understood that the larger the value of L1/D1 is, the more favorable the stability of coaxiality is under the premise of ensuring the large end face of D2.
To enhance the mating between the second connector and the first connector, the connector assembly further includes a first resilient member 42 disposed at one end of the second connector to provide a force to the second connector in the direction of the first connector. The first elastic member 42 is sleeved at the end of the second connecting member. Referring to fig. 8 and 11, in this embodiment, the first elastic member 42 is a spring, and in this embodiment, since the first connecting member is a threaded rod 41, for better assembly, the first elastic member 42 can be sleeved on the end of the threaded rod 41 and close to the operating member 30, so that the first elastic member 42 always provides a biasing force to the threaded rod 41 downward along the axis X0, so as to facilitate better threaded engagement between the lower end of the threaded rod 41 and the bottom plate rotating shaft 23. The operating member 30 has two states, an open state and a closed state. When the sander 100 is not in the working state and the base plate assembly 20 needs to be replaced, the operating member 30 can rotate relative to the main casing 13 when the operating member 30 is set to the open state, and the operating member 30 drives the threaded rod 41 to rotate. When the operating member 30 is closed, the threaded rod 41 can rotate relative to the operating member 30. When the sander 100 is in the working state, the operating member 30 is in the closed state, and the threaded rod 41 can rotate freely relative to the operating member 30.
When the threaded rod 41 is screwed to the bottom plate rotating shaft 23 through the operating member 30, the rotation of the threaded rod 41 drives the bottom plate rotating shaft 23 to rotate, and the rotation of the bottom plate rotating shaft 23 drives the intermediate shaft 12 to rotate through the torque output portion 71 and the torque input portion 72, so that the external thread 411 of the threaded rod 41 cannot be engaged with the internal thread of the bottom plate rotating shaft 23. Therefore, when the threaded rod 41 is screwed to the floor shaft 23 by the operating element 30, the rotation of the intermediate shaft 12 must be restricted. In this embodiment, the sander 100 further includes a locking assembly that can limit rotation of the intermediate shaft 12 to achieve mating or unmating of the first connector and the second connector. Referring to fig. 8, 11 and 13, the locking assembly includes a first locking member 1181 movable relative to the main housing 13 but not rotatable, and a second locking member 1182 fixedly connected to or integrally provided with the intermediate shaft 12, wherein the first locking member 1181 is movable between a first position and a second position, and when the first locking member 1181 is located at the first position, the first locking member 1181 is engaged with the second locking member 1182, that is, the locking mechanism is in a locked state, and the intermediate shaft 12 is circumferentially locked. As can be seen from the above description, in this embodiment, since the second transmission wheel 152 is fixedly sleeved on the outer side of the intermediate shaft 12 to drive the intermediate shaft 12 to rotate, that is, the intermediate shaft 12 and the bottom plate rotating shaft 23 are connected in a non-rotatable manner, when the intermediate shaft 12 is locked, the bottom plate rotating shaft 23 is also locked, and cannot rotate circumferentially. Further, since the torque output portion 71 and the torque input portion 72 are engaged by the engagement teeth to transmit the torque, that is, the intermediate shaft 12 and the floor shaft 23 are not rotatable relative to each other in the circumferential direction, the floor shaft 23 is also locked in the circumferential direction after the intermediate shaft 12 is locked, and thus the threaded rod 41 is operatively rotated relative to the floor shaft 23. When the first locking member 1181 is located at the second position, the first locking member 1181 is separated from the second locking member 1182, that is, the locking mechanism is in an unlocked state, and the locking mechanism releases the circumferential lock of the intermediate shaft 12, so that the intermediate shaft 12 can rotate relative to the main housing 13. In this embodiment, the locking mechanism is specifically as follows: the locking member 1182 is a flange body fixed on the outer side of the intermediate shaft 12, wherein the flange body is provided with a stop groove 1810, the first locking member 1181 is an axially movable stop block, when the stop block moves axially upwards to a first position, the stop block is at least partially located in the stop groove 1810 to limit the intermediate shaft 12 to perform circumferential rotation, and when the stop block moves axially downwards to a second position, the stop block is separated from the stop groove 1810, and the intermediate shaft 12 can freely rotate. It will be understood that in other embodiments, the movement direction of the stop block may be along other directions, such as a radial direction or a direction at other angles to the axial direction, which will not be described herein. It will be appreciated that in other embodiments, the locking mechanism may lock the base plate shaft 23 in other ways, such as by limiting the rotation of the motor, or by directly limiting a component on the base plate shaft 23, so long as the rotation of the base plate shaft 23 is enabled.
In addition, the switching of the lock mechanism between the locked state and the unlocked state of the present embodiment is achieved by the operating member 30. When the operating element 30 is in the closed state, the operating element 30 axially abuts against the first locking element 1181 (stop block), the first locking element 1181 compresses the first elastic element 31 downwards, and therefore the first locking element 1181 is located at the second position below, the first locking element 1181 is separated from the second locking element 1182, and the locking mechanism is in the unlocked state; when the operating member 30 is switched from the closed state to the open state, the second locking member 1182 moves upward to the first position under the action of the first elastic element 31, the stopper is engaged with the stopper groove 1810, and the locking mechanism is in the locked state.
Referring to fig. 7, 11 and 14, the operating member 30 includes a handle portion 32 for being held by an operator and a base 33, and the handle portion 32 is pivotally provided to the base 33 by a pivot shaft to switch between a first operating position and a second operating position. Preferably, the pivot shaft includes a first pivot shaft 341 fixed to the handle portion 32 and a second pivot shaft 342 fixed to the base 33, the base 33 is provided with a first chute 331 for the first pivot shaft 341 to rotate, and the handle portion 32 is provided with a second chute (not shown) for the second pivot shaft 342 to move. The handle portion 32 is switchable between a second operation position (second operation position such as the state of fig. 7) of the closed state and a first operation position (first operation position such as the state of fig. 14) of the open state. When the handle portion 32 is located at the second operation position, the handle portion 32 at least partially protrudes out of the main housing 13; when the handle portion 32 is in the first operation position, the operation piece 30 does not exceed the outer contour of the main casing 13; that is, when the grip portion 32 is in the second operating position, the grip portion 32 is positioned substantially on the same horizontal line as the grip handle 141; when the grip portion 32 is in the first operating position, the grip portion 32 is disposed at an angle to the grip handle 141. The handle portion 32 is provided with an abutment surface 35 for abutting against the first lock 1181. Referring to fig. 11, when the handle portion 32 is in the second operation position (in the closed state), the abutment surface 35 of the handle portion 32 abuts against the first locking member 1181, and further abuts against the first elastic element 31 by the first locking member 1181, so that the first elastic element 31 is compressed, the first locking member 1181 is located in the second position below, and at this time, the intermediate shaft 12 can rotate together with the second transmission wheel 152 under the driving of the motor 11 after the power switch (not shown) is started; when the handle portion 32 moves from the second operation position (closed state) shown in fig. 7 (fig. 11) to the first operation position (open state) (fig. 14), the abutment surface 35 moves upward and the first locking member 1181 moves upward by the first elastic member 31 to move the first locking member 1181 upward to the first position, the intermediate shaft 12 is locked, and the intermediate shaft 12 is non-rotatable with respect to the main casing 12.
As described above, the handle portion 32 can be used to rotate the threaded rod 41, so that the sander 100 is simple to operate and the sander 100 is also simple in structure. The cooperation of the operating element 30 with the threaded rod 41 is as follows: when the operating member 30 is in the closed state, i.e. the first handle portion 32 is in the second operating position and the first locking member 1181 is in the second position, the handle portion 32 cannot rotate the threaded rod 41; when the handle portion 32 is rotated from the second operating position to the first operating position about the pivot axis, at this time, the first locking member 1181 becomes positioned at the first position, the intermediate shaft 12 is locked, and the handle portion 32 can rotate the threaded rod 41 about its axis (i.e., the axis of the intermediate shaft 12). In this embodiment, the threaded rod 41 is provided with a transmission element, referring to fig. 11, and the transmission element is a second lug 417 disposed on the threaded rod 41, and the operating member 30 includes a first lug 36 corresponding to the second lug 417, where the first lug 36 is engaged with the second lug 417 when the handle portion 32 is in the first operating position, so that the handle portion 32 can rotate the threaded rod 41 relative to the main housing 13, and thus the base plate assembly 20 can be connected to or disconnected from the main body 10.
Referring to fig. 1 and 7, in the present embodiment, a first air inlet 131, a second air inlet 132 and a first air outlet 133 are formed on the main housing 13. In this embodiment, the sander 100 is provided with a first fan 61 for cooling the motor 11, the first fan 61 is disposed coaxially with the motor 11 and is located at one end of the motor 11 near the floor assembly 20, and the first fan 61 is located below the stator and rotor of the motor 11. In this embodiment, in order to reduce the length of the sander 100 in the horizontal direction, the second fan 631 and the first fan 61 are disposed in a vertically offset manner, that is, the first fan 61 and the second fan 631 are not at the same horizontal height, and preferably, the second fan 631 is located below the first fan 61 in the height direction. The second fan 631 serves to cool the second driving wheel 152. In this embodiment, a first cooling air path and a second cooling air path are formed in the sander 100, and the first cooling air path and the second cooling air path share the same first air outlet 133, at least part of the first air inlet 131 is close to the motor, at least part of the first air outlet 133 is close to the second fan 631, in this embodiment, at least part of the first air inlet 131 is located above the stator and the rotor of the motor 11, and at least part of the first air outlet 133 is located on the main casing 13 in the area corresponding to the second fan 631. The first cooling air path sequentially passes through the first air inlet 131, the motor 11, the transmission part 15 and the first air outlet 133, and the second cooling air path sequentially passes through the second air inlet 132, the transmission part 15 and the first air outlet 133. Specific: the external air flows through the motor 11 and the transmission part 15 from the first air inlet 131 near the motor 11 under the action of the first fan 61, and flows out from the first air outlet 133 near the second fan 631 under the action of the second fan 631, that is, the air flows stably from the first air inlet 131 and the second air inlet 132 into the main casing 13, moves to the first fan 61 through the motor 11, and is guided out of the main casing 13 from the first air outlet 133 through the transmission part 15 and then the second fan 631. In this embodiment, since the first cooling air path passes through the motor 11 and then passes through the transmission portion 15, when the cooled air reaches the transmission portion 15, particularly, when the cooled air reaches the second transmission wheel 152, the temperature of the air is relatively high compared with the temperature of the air at the position of the motor 11, so that the cooling efficiency is relatively low, and therefore, in this embodiment, a second cooling air path for cooling the second transmission wheel 152 is also required to further reduce the temperature of the transmission portion 15. The present embodiment communicates the first cooling air path for cooling the motor 11 with the second cooling air path mainly for cooling the second driving wheel 152.
The sander 100 further includes a dust collecting device 40 provided on the main body, and a dust collecting air passage is provided in the sander 100, and sucks in and discharges the air and dust from the underside of the sanding bottom plate 221 into the dust collecting device 40. The third fan 632 shares the same hub with the second fan 631, in other words, the second fan 631 is above the hub and the third fan 632 is below the hub. The air inlet (not numbered) of the dust collection air path is located on a side of the polishing base 221 facing the sand paper and the sand paper, and the air outlet (not numbered) of the dust collection air path is a dust collection outlet of the dust collection device 40 which is communicated with the third fan 63, so as to blow the chips and dust generated in the polishing part 12 during polishing into the dust collection device 40 through the third fan 63, and the dust collection device 40 can be a dust collection bag or a dust collection box. It will be appreciated that the air duct may be arranged in other manners, such as only one fan is used to cool the motor 11 and the transmission portion 15 at the same time, but the fan combination and the air duct are arranged in the following two advantages compared to the fan combination and the transmission portion 15 which are used to cool the motor 11 and the transmission portion at the same time: 1. the cooling effect is better, and 2, the size is reduced. Because, if only one fan is used to cool the motor and the driving member, the cooling effect of the driving member will be reduced because the air after cooling the motor cools the driving member, in addition, if a fan with a larger size is needed to achieve a better cooling effect, and if a fan with a larger size is used, the size of the position where the fan is located will become larger, and meanwhile, the limit foot needs to avoid the position of the fan, and the limit foot needs to move outwards.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims (9)

1. The utility model provides a polishing tool, includes the body part and sets up the bottom plate subassembly on the body part, the body part includes casing, motor, offset in the jackshaft of motor one side and is used for supplying energy to the motor energy supply subassembly, the casing includes the main casing that is used for accomodating motor and jackshaft, the bottom plate subassembly sets up in the lower extreme of jackshaft, the bottom plate subassembly includes the polishing bottom plate, the bottom plate subassembly carries out polishing work through the polishing bottom plate under the drive of motor, polishing tool still includes the energy supply subassembly that is used for supplying energy to the motor, its characterized in that, the axis of jackshaft and the axis parallel and the interval setting of motor, and motor and energy supply subassembly distributes in the both sides of jackshaft;
The energy supply assembly is a battery pack, the shell further comprises a holding shell which is arranged at one end of the main shell, which is close to the intermediate shaft, and is arranged at an angle with the main shell, and the battery pack and the main shell are distributed at two ends of the holding shell;
the orthographic projection of the holding shell on the polishing bottom plate exceeds the polishing bottom plate.
2. The sanding tool of claim 1, wherein the battery pack has a mass between 333g and 630g, and wherein the center of gravity of the sanding tool is located on a side of the intermediate shaft remote from the motor and the projection in the direction of the sanding sole falls into the sanding sole.
3. The abrasive tool of claim 1, wherein the distance from the end of the main housing remote from the grip housing to the end of the main housing connected to the grip housing is between 70mm and 80 mm.
4. The abrasive tool of claim 1, wherein a distance from an end of the body portion proximate the motor to an end of the body portion distal from the motor is between 185mm and 220 mm.
5. The abrasive tool of claim 1, wherein the shoe assembly is removably mounted to the body portion and the shoe assembly is either a round sand shoe assembly or a board sand shoe assembly.
6. The abrasive tool of claim 1, further comprising a stop foot between the body portion and the floor assembly, the stop foot being selectable
Is operatively connected to the base plate assembly to limit rotational movement of the sanding base plate of the base plate assembly about the axis of the intermediate shaft.
7. The abrasive tool of claim 1 or 4, wherein the body portion further comprises a torque output for transmitting power of the motor to the shoe assembly and a transmission for transmitting power of the motor to the torque output, the transmission comprising a first drive wheel driven by the motor and a second drive wheel driven by the first drive wheel, and the rotational axes of the first and second drive wheels being spaced apart.
8. The abrasive tool of claim 7, wherein the body further comprises a second fan fixedly disposed opposite the second drive wheel and configured to cool the second drive wheel, and a first fan coaxially disposed with the motor and disposed at an end of the motor adjacent the floor assembly and configured to cool the motor.
9. The abrasive tool of claim 8, wherein the housing is provided with at least one air inlet and at least one air outlet, the at least one air inlet being positioned adjacent to the motor, the at least one air outlet being positioned adjacent to the second fan, the external air flow flowing through the motor from the air inlet adjacent to the motor under the action of the first fan and out from the air outlet adjacent to the second fan under the action of the second fan.
CN201910036552.0A 2018-01-15 2019-01-15 Polishing tool Active CN110039442B (en)

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Application Number Priority Date Filing Date Title
CN2018100349345 2018-01-15
CN201810034934 2018-01-15

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CN110039442A CN110039442A (en) 2019-07-23
CN110039442B true CN110039442B (en) 2024-05-07

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CN201920064413.4U Active CN209408223U (en) 2018-01-15 2019-01-15 Milling tools
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