CN111283514B

CN111283514B - Grinding machine bottom plate assembly and grinding machine

Info

Publication number: CN111283514B
Application number: CN201811502726.XA
Authority: CN
Inventors: 孙开军; 余鸿东; 缪海俊
Original assignee: Positec Power Tools Suzhou Co Ltd
Current assignee: Positec Power Tools Suzhou Co Ltd
Priority date: 2018-12-10
Filing date: 2018-12-10
Publication date: 2023-02-17
Anticipated expiration: 2038-12-10
Also published as: CN111283514A

Abstract

The invention relates to a polisher baseplate assembly and a polisher.A rigid fixing piece is arranged on a baseplate shell, and is connected with a plastic bearing chamber and a bearing outer ring through the rigid fixing piece, so that the elastic deformation of the plastic bearing chamber and the separation of an output shaft and the plastic bearing chamber caused by the deformation of the plastic bearing chamber are reduced through the rigid fixing piece, the friction force of a bearing is increased, and the phenomenon of 'ring running' is prevented; and because of using the plastic bearing chamber, compared with the prior art, avoid the rigid impact, prevent from producing the damage to the body of the bottom plate, keep the life cycle to control stably; and by adopting the rigid fixing piece, compared with the prior art, the strength of the plastic bearing chamber is improved, so that the service life of the bottom plate component of the grinding machine is prolonged.

Description

Grinding machine bottom plate assembly and grinding machine

Technical Field

The invention relates to a grinding machine bottom plate assembly and a grinding machine, and belongs to the field of grinding machines.

Background

The bottom plate shell of the sander such as a sander needs to be in contact with the sanding bottom plate shell, and the sander is driven by the eccentric shaft to translate at high frequency to drive the abrasive paper at the lower part of the bottom plate shell to sand and polish wooden products, metal products, wall surfaces and the like. The force transmitted to the chassis housing is achieved by the bearings on the chassis housing, so the plastic bearing chamber on the chassis housing is subjected to high frequency shock and bearing heating. The plastic bearing chamber on the bottom plate shell is generally formed or processed by the same material as the bottom plate shell, and generally comprises two types, namely plastic and metal, but the currently adopted bottom plate shell has the following problems: although the bottom plate shell has the advantages of light weight and workpiece collision prevention, the problems are as follows: the packing force to the bearing is limited, the bearing is easy to deform under stress and heating, so that a plastic bearing chamber or the bearing is easy to lose efficacy, the performance stability of a long period cannot be ensured (the bearing is not fixed tightly after being used for a period of time, so that vibration, service life and noise are caused), and the phenomenon of ring running exists. Although the metal bottom plate shell has the advantages of good strength and reliable bearing fixing, the metal bottom plate shell has the following problems: the whole machine is heavy and is easy to damage the polishing bottom plate shell.

Disclosure of Invention

The invention aims to provide a plastic bearing chamber assembly which can prevent bearing race, prolong the service life and keep stable operation in the life cycle.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a polisher bottom plate subassembly, includes output rotary motion's output shaft, bottom plate casing and bearing, be formed with the plastic bearing room that is used for accomodating the bearing on the bottom plate casing, the bearing is located between output shaft and the plastic bearing room, the bearing include with output shaft fixed connection's bearing inner race, with plastic bearing room fixed connection's bearing outer race and be located the driving medium between bearing outer race and the bearing inner race, the output shaft drives the polishing bottom plate casing through the bearing and carries out the work of polishing, polisher bottom plate subassembly is still including connecting the rigid mounting of plastic bearing room and bearing outer race is in order to pass through the rigid mounting reduces the elastic deformation of plastic bearing room and by the output shaft that the deformation of plastic bearing room leads to breaks away from with the plastic bearing room.

Further, the rigid fixing part comprises at least one pressure plate extending in the radial direction, and the pressure plate is fixedly connected with the plastic bearing chamber and is pressed on the end part of the bearing outer ring in the radial extending process.

Further, the plastic bearing housing includes an end surface substantially flush with the bearing cup end, the pressure plate being fixedly crimped to the end surface.

Further, at least one of the pressure plates is connected with the plastic bearing chamber through a fastener.

Further, it is characterized in that the rigid fixture includes an insert portion extending axially and being inserted between the bearing outer race and the plastic bearing housing.

Further, the plastic bearing housing has a side wall and a bottom wall, the insert portion is sandwiched between the side wall and the bearing outer race, and the rigid retainer further includes an extension portion that extends radially and sandwiches between the bearing outer race and the bottom wall.

Further, the insertion portion and the extension portion are integrally formed.

Further, the plastic bearing housing has a side wall and a top wall, the insert portion being sandwiched between the side wall and the bearing outer race, the rigid retainer further including an extension extending radially and sandwiched between the top wall and the bearing.

Further, the embedding part and the extending part are integrally formed.

The invention also provides a grinding machine which comprises the grinding machine bottom plate assembly.

The invention has the beneficial effects that: according to the polisher baseplate assembly and the polisher, the rigid fixing piece is arranged on the baseplate shell, and the rigid fixing piece is connected with the plastic bearing chamber and the bearing outer ring, so that the elastic deformation of the plastic bearing chamber is reduced through the rigid fixing piece, and an output shaft is separated from the plastic bearing chamber due to the deformation of the plastic bearing chamber, so that the friction force of a bearing is increased, and the phenomenon of 'race' is prevented; and because of using the plastic bearing chamber, compared with the prior art, avoid the rigid impact, prevent from producing the damage to the body of the bottom plate, keep the life cycle to control stably; and by adopting the rigid fixing piece, compared with the prior art, the strength of the plastic bearing chamber is improved, so that the service life of the bottom plate component of the grinding machine is prolonged.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to make the technical solutions of the present invention practical in accordance with the contents of the specification, the following detailed description is given of preferred embodiments of the present invention with reference to the accompanying drawings.

Drawings

Fig. 1 is a schematic view of a part of a sander according to a first embodiment of the present invention;

fig. 2 to 5 are schematic structural views of other plastic bearing housing assemblies according to the present invention.

Detailed Description

The following detailed description of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

Referring to fig. 1, a sander according to an embodiment of the present invention is a sander, the sander includes a main body 100 and a sander bottom plate assembly 200 mounted on the main body 100, taking fig. 1 as an example, the upper and lower positions of fig. 1 are reference viewing angles in the following description, in fig. 1, a default machined surface is located below the sander, and the sander bottom plate assembly 200 is located below the main body 100, of course, in the specific implementation process, when the spatial position of the machined surface is changed, the positions of the sander bottom plate assembly 200 and the main body 100 in the space are changed correspondingly, and if the machined surface is located at the top of the sander bottom plate assembly 200 is located above the main body 100. The main body 100 includes a motor (not shown) and a driving shaft 101 connected to the motor to output power of the motor, and the driving shaft 101 performs a rotational motion. The sander base plate assembly 200 includes an output shaft 10 connected to a drive shaft 101 to output rotary motion, a base plate housing 21, a bearing 11, and a rigid mount 22. The bottom plate shell 21 is provided with a plastic bearing chamber (not numbered) for accommodating a bearing, the bearing 11 is positioned between the output shaft 10 and the plastic bearing chamber, the bearing 11 comprises a bearing inner ring fixedly connected with the output shaft 10, a bearing outer ring fixedly connected with the plastic bearing chamber and a transmission part positioned between the bearing outer ring and the bearing inner ring, and the output shaft 10 drives the bottom plate shell 21 to perform polishing work through the bearing 11. The rigid mount 22 connects the plastic bearing housing and the bearing outer race to reduce elastic deformation of the plastic bearing housing by the rigid mount 22 and disengagement of the output shaft from the plastic bearing housing caused by deformation of the plastic bearing housing. The bearing cup has an end portion including oppositely disposed upper and

lower end portions

111 and 112, and a side surface 113.

The bottom plate shell 21 includes the support that grinds board 210 and be used for installing and grind board 210, and the support includes the installation department 212 that is used for forming the plastic bearing room and certainly installation department 212 outwards extends the fixed part 211 that forms, grinds board 210 through being connected with fixed part 211 in order to fix on bottom plate shell 21, grinds the below that board 210 is located installation department 212. The plastic bearing chamber has side walls 231 and a top wall 232 formed by the mounting portion 212. Rigid mount 22 is a radially extending pressure plate, and rigid mount 22 is disposed on mounting portion 212. The rigid fixing member 22 is fixedly connected to the plastic bearing chamber and is pressed against the lower end portion 112 of the bearing outer ring in the radial extending process, the rigid fixing member 22 is located at the lower side of the plastic bearing chamber, the outer side surface 113 of the bearing outer ring is in contact with the side wall 231 of the plastic bearing chamber, the upper end portion 111 of the bearing outer ring is in contact with the top wall 232 of the plastic bearing chamber, and the lower end portion 112 of the bearing outer ring is in contact with the rigid fixing member 22, so that the rigid fixing member 22 fixes the bearing 11 in the plastic bearing chamber in the axial direction. The mounting portion 212 of the plastic bearing housing includes an end surface (not numbered) formed on the mounting portion 212 that is substantially flush with the lower end 112 of the bearing outer race, and the rigid retainer 22 is fixedly crimped thereto. In this embodiment, the rigid mount 22 is fixed to the mounting portion 212 by the fastener 13. In this embodiment, in order to prevent the rigid fixture 22 from contacting the sanding plate 210, an inner groove 213 is formed on the bottom surface of the mounting portion 212 to receive the rigid fixture 22, and the inner groove 213 has a depth greater than the thickness of the rigid fixture 22. In order to prevent the fastener 13 from contacting the sanding plate 210 to damage the sanding plate 210, the fastener 13 does not protrude out of the inner recess 213, and in order to improve the axial securing reliability and avoid thermal deformation, the fastener 13 is made of a rigid material. In this embodiment, the fastening member 13 is located on the same side as the rigid fixing member 22, and the fastening member 13 penetrates through both the rigid fixing member 22 and the mounting portion 212.

In the first embodiment, the plastic bearing chamber has the top wall 232, and the upper end 111 of the outer ring of the bearing outer ring abuts against the top wall 232 of the plastic bearing chamber, so that it can be considered that the opening of the plastic bearing chamber is downward, and the rigid fixing member needs to fix the bearing in the bearing chamber, and the rigid fixing member is located below the plastic bearing chamber. In the first embodiment, three fasteners are arranged, each fastener is arranged at 60 degrees, and the rigid fixing piece is of an integral structure. The fastener penetrates through the mounting part and the rigid fixing part at the same time, the rigid fixing part is actually a pressing plate, and the rigid fixing part is used for improving the pressure of the end face so as to improve the axial holding force; however, in other embodiments, as shown in fig. 2a and 2b, the

fasteners

34a, 34b may not extend through the

mounting portions

312a, 312b, and the

fasteners

34a, 34b may be located on the same side of the

rigid mounts

32a, 32 b.

In the foregoing embodiment, the rigid fixing member is a pressing plate disposed only at one end of the plastic bearing chamber, and the axial holding force of the bearing is formed by the pressing plate and the top wall or the bottom wall of the mounting portion, please refer to fig. 3a to 3 c. The plastic bearing chamber shown in fig. 3a to 3c is enclosed by the mounting portion 412 and has a side wall 431 formed by the mounting portion 412 and an upper opening (not numbered) and a lower opening (not numbered) disposed opposite. The upper pressing plate 421 is disposed on the upper opening side, the lower pressing plate 422 is disposed on the lower opening side, the upper pressing plate 421 and the lower pressing plate 422 are clamped on the upper and lower sides of the bearing outer ring (the bearing in the present embodiment is the same as the bearing used in the first embodiment) of the bearing 11, the upper pressing plate 421 contacts with the upper end 111 of the bearing outer ring, the lower pressing plate 422 contacts with the lower end 112 of the bearing outer ring, and the upper pressing plate 421 and the lower pressing plate 422 are both fixed on the mounting portion 412 by the fastening member 44 a. The mounting portion 412 of the plastic bearing housing includes two end surfaces (not numbered) formed on the mounting portion 412, the two end surfaces are substantially flush with the upper end portion 111 and the lower end portion 112 of the bearing outer ring, respectively, and the upper pressing plate 421 and the lower pressing plate 422 are fixedly pressed on the two end surfaces by fasteners 44a, respectively. In fig. 3a and 3b, the upper plate 421 and the lower plate 422 are fixed to the mounting portion 412 by the one-

side fasteners

44a and 44b at the same time, and in fig. 3c, the upper plate 421 and the lower plate 422 are fixed to the mounting portion 412 by the fastener 44c, respectively. In the chassis housing 41 shown in fig. 3a to 3c, in order to prevent the fastening member 44 and the lower pressing plate 422 from directly contacting the sanding plate 210, the bottom surface of the mounting part 412 is provided with a lower groove 413 to receive the lower pressing plate 422, as in the first embodiment.

In the foregoing embodiment, the bearing is fixed in the plastic bearing housing in the axial direction by a rigid fixing member. In other embodiments, the bearing may be fixed radially in the plastic bearing chamber by a rigid fixing member, or the bearing may be fixed radially and axially in the plastic bearing chamber by a rigid fixing member.

Referring to fig. 4a to 4c, the plastic bearing housing assembly fixes the bearing 11 (the bearing used in the embodiment is the same as the bearing used in the first embodiment) in the plastic bearing housing through the rigid fixing member in the radial direction, so as to improve the radial holding force thereof, and at the same time, prevent the outer ring of the bearing housing from directly contacting the mounting portion 412, which causes the mounting portion 412 to deform during the use process. The rigid mount is an insert 52a extending axially and being inserted between the bearing outer race and the plastic bearing housing. The concrete structure is as follows: referring to fig. 4a, the plastic bearing chamber has a side wall 531a and a bottom wall 533a, and the insert 52a is inserted between the side wall 531a and the bearing outer race. Referring to fig. 4b, the plastic bearing housing has a side wall 531b and a bottom wall 533b, and unlike the rigid fixing member shown in fig. 4a, the rigid fixing member 52b is L-shaped, and the rigid fixing member 52b has an embedded portion 521b extending axially and embedded between the side wall 531b and the bearing outer race, and an extending portion 522b extending radially and clamped between the bottom wall 533b and the bearing outer race. The embedded portion 521b is integrally formed with the extension portion 522b. In this embodiment, the insert 52a, in addition to having the bearing outer race positioned in the radial direction, may also position the lower end 112 of the bearing outer race. Referring to fig. 4c, the plastic bearing housing has a side wall 531c and a top wall 532c, and the rigid retainer 52c has an embedded portion 521c extending radially and embedded between the side wall 531c and the outer race of the bearing, and an extending portion 522b extending axially and sandwiched between the top wall 532c and the outer race of the bearing. In this embodiment, the rigid fixture 52c may position the upper end 111 of the bearing outer race in addition to positioning the bearing outer race in the radial direction.

Referring to fig. 5a to 5e, the plastic bearing housing assembly fixes the bearing 11 (the same bearing used in the present embodiment as the bearing used in the first embodiment) in the plastic bearing housing by the rigid fixing member in the radial and axial directions, so as to improve the radial holding force and the axial holding force at the same time. The rigid mount used includes a platen and an insert. In fig. 5a and 5b, the axial clasping force of the bearing 11 is realized by the pressing plate together with the mounting portion 61, in fig. 5a, the insert 621a is L-shaped, the insert 621a includes an insert portion 6211a extending radially and being inserted between the side wall 631a and the bearing outer race, and an extension portion 6212b extending axially and being clamped between the bottom wall 633a and the bearing outer race, in fig. 5b, the insert 621b is L-shaped, the insert 621a includes an insert portion 211b extending radially and being inserted between the side wall 631b and the bearing outer race, and an extension portion 6212b extending axially and being clamped between the top wall 632b and the bearing outer race. In fig. 5a and 5b, the

pressure plates

622a, 622b are fixed to the mounting portion 61 by

fasteners

64a, 64b located on the same side. In fig. 5c to 5e, the pressing plate 622 includes an upper pressing plate 6221 and a lower pressing plate 6222, the upper pressing plate 6222 and the lower pressing plate 6221 are clamped at the upper end portion 111 and the lower end portion 112 of the bearing outer ring to realize the axial holding force, the upper pressing plate 421 and the lower pressing plate 6222 are fixed on the mounting portion 61 by fasteners, in fig. 5c, a fastener 64c is fixed on one side of the lower pressing plate 6222, in fig. 5d, a fastener 64d is fixed on one side of the upper pressing plate 6221, and in fig. 5e, the upper pressing plate 421 and the lower pressing plate 422 are respectively fixed on the mounting portion 61 by fasteners 64e on one side thereof. In fig. 5b to 5e, a lower groove 613 is concavely formed on the bottom surface of the mounting portion 61 to receive the pressing plate.

In the above embodiments, the rigid fixing member is a metal member formed by an injection molding or press fitting process. When the bearing housing is used specifically, the shape of the rigid fixing piece, the fixing mode of the fastener and the use of the rigid fixing piece can be changed correspondingly according to the shape and the specific use condition of the plastic bearing housing according to the embodiments, and different combination changes can be made according to the embodiments.

In the foregoing embodiments, the rigid fixing member is connected to the bottom plate casing only by the fastening member, while in other embodiments, in order to facilitate fixing and increase axial connection, a clamping structure may be added between the rigid fixing member and the bracket to achieve further connection.

In summary, the base plate assembly of the grinding machine and the grinding machine have the advantages that the rigid fixing piece is arranged on the base plate shell, and the rigid fixing piece is connected with the plastic bearing chamber and the bearing outer ring so as to reduce the elastic deformation of the plastic bearing chamber and the separation of the output shaft and the plastic bearing chamber caused by the deformation of the plastic bearing chamber, thereby increasing the friction force of the bearing and preventing the phenomenon of 'race'; and because of using the plastic bearing chamber, compared with the prior art, avoid the rigid impact, prevent from producing the damage to the shell of the bottom plate of polishing, keep the life cycle to control stably; and compared with the prior art, the strength of the plastic bearing chamber is improved by adopting the rigid fixing piece, so that the service life of the bottom plate component of the grinding machine is prolonged.

All possible combinations of the technical features in the above embodiments may not be described for the sake of brevity, but should be considered as being within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.

The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A polisher base plate assembly comprising an output shaft for outputting rotary motion, a base plate housing and a bearing, wherein a plastic bearing chamber for accommodating the bearing is formed on the base plate housing, the bearing is positioned between the output shaft and the plastic bearing chamber, the bearing comprises a bearing inner ring fixedly connected with the output shaft, a bearing outer ring fixedly connected with the plastic bearing chamber and a transmission member positioned between the bearing outer ring and the bearing inner ring, and the output shaft drives the base plate housing to perform polishing work through the bearing; the bottom plate casing is including polishing board, support, the support is including being used for forming the installation department of plastic bearing room reaches certainly the outside fixed part that extends the formation in both sides of installation department, the fixed part is used for the installation the polishing board, be formed with the inner groovy on the bottom surface of installation department, the rigidity mounting is accomodate in the inner groovy, the groove depth of inner groovy is greater than the thickness of rigidity mounting, just the plastic bearing room include with the terminal surface that bearing inner race tip flushed basically, the fixed crimping of mounting is in the terminal surface.

2. The sander base plate assembly of claim 1 wherein said rigid mount comprises at least one radially extending pressure plate fixedly attached to said plastic bearing housing and in the process of extending radially, press-fit against the end of said bearing cup.

3. The sander-base assembly of claim 2 wherein at least one of said pressure plates is attached to the plastic bearing housing by fasteners.

4. The sander base plate assembly of any of claims 1 to 3, wherein the rigid fixture comprises an insert extending axially and being inserted between the bearing outer race and the plastic bearing housing.

5. The sander base plate assembly of claim 4, wherein said plastic bearing chamber has side walls and a bottom wall, said insert portion being sandwiched between said side walls and said bearing cup, said rigid retainer further comprising an extension extending radially and sandwiching said bearing cup and said bottom wall.

6. The sander base plate assembly of claim 5, wherein said insert and extension are integrally formed.

7. The sander-base plate assembly of claim 4, wherein said plastic bearing housing has side walls and a top wall, said insert being sandwiched between said side walls and a bearing cup, said rigid retainer further comprising an extension extending radially and sandwiched between said top wall and a bearing.

8. The sander base plate assembly of claim 7, wherein said insert and extension are integrally formed.

9. A sanding machine characterized in that it comprises a sanding machine base plate assembly according to any one of claims 1 to 8.