Sanding machine

Abstract

The utility model relates to a sander which comprises a machine shell, a driving assembly and a bottom plate assembly, the machine shell comprises a main shell contained in the driving assembly and a middle cover connected to the main shell, and the middle cover is located between the main shell and the bottom plate assembly; the sanding machine further comprises a brake ring installed on the middle cover, the middle cover is provided with a volute adjacent to the bottom plate assembly, one end of the brake ring is combined with the volute, the other end of the brake ring abuts against the bottom plate assembly, and the volute is provided with an installation part sunken from the edge. The brake ring comprises a supporting part installed on the installation part, a friction part abutting against the bottom plate assembly and an embedded part installed on the friction part, the supporting part is combined with the friction part, and the embedded part is installed on the friction part in an injection molding mode. The brake ring is arranged in the sanding machine, the brake ring is composed of the supporting part, the friction part and the embedding part, the supporting part is combined with the friction part, the embedding part is installed on the friction part in an injection molding mode, only the friction part needs to be replaced when the brake ring is replaced, replacement time is shortened, the supporting part does not need to be replaced, and cost is reduced.

Description

[Technical field]

[0001] The utility model relates to a sanding machine, in particular to a sanding machine including a brake ring. [Background Technology]

[0002] As a commonly used grinding and polishing tool, sanding machines are mainly used for cleaning, deburring, and leveling and polishing large surfaces in building decoration, furniture painting, and bathroom. Sanding machines mainly include a housing, a drive assembly, a fan assembly, an eccentric element, a brake ring, and a bottom plate assembly. The housing is used to accommodate the drive assembly, the motor assembly, and the eccentric element. The bottom plate assembly is at least partially outside the housing, and the bottom plate assembly is used to connect sandpaper. When the whole machine is running, when the brake ring contacts the bottom plate assembly, when the bottom plate assembly rotates for the initial operation, the two perform dry friction to achieve a decelerated rotation of the bottom plate, thereby increasing the service life of the bottom plate bearing and the bottom plate.

[0003] For sanding machines in the prior art, please refer to the Chinese utility model patent No. CN215659543U announced on January 28, 2022, which discloses: a sanding machine, when braking and decelerating, the bottom plate mounting seat continues to swing under the action of inertia, and contacts the friction surface of the friction part of the corresponding elastic brake block, pushing the friction part outward, shrinking the adjustment hole, and the friction part deforms to generate an inward force, so that friction resistance is generated when the outer periphery of the bottom plate mounting seat contacts the friction surface, and each elastic brake block brakes the bottom plate mounting seat to stop rotating quickly. However, in the above-mentioned braking scheme, the contact area between the friction surface of the elastic brake block of the brake disc and the bottom plate mounting seat is small, and the braking effect is not good; in addition, the friction part of the elastic brake block is easily damaged, and replacement is cumbersome and costly.

[0004] In view of this, it is indeed necessary to provide an improved sanding machine to overcome the defects of the prior art. [Summary of the invention]

[0005] In view of the deficiencies in the prior art, the utility model aims to provide a sanding machine which is low in cost and convenient for replacing brake rings.

[0006] The utility model solves the problems of the prior art by adopting the following technical solutions: a sanding machine comprises a casing, a driving assembly installed in the casing and a base plate assembly driven by the driving assembly, the casing comprising a main shell housed in the driving assembly and an intermediate cover connected to the main shell, the intermediate cover is located between the main shell and the base plate assembly, and the driving assembly has a motor axis; the sanding machine also comprises a brake ring installed on the intermediate cover, the intermediate cover has a volute adjacent to the base plate assembly, one end of the brake ring is combined with the volute, and the other end abuts against the base plate assembly, the volute has a mounting portion recessed from an edge, the brake ring comprises a supporting portion installed on the mounting portion, a friction portion abutting against the base plate assembly and an embedded portion installed on the friction portion, the supporting portion is combined with the friction portion, and the embedded portion is injection-molded and mounted on the friction portion.

[0007] A further improvement is that the support portion and the friction portion are made of rubber, and the embedded portion is made of metal.

[0008] A further improvement is that the support portion is made of a first rubber material, and the friction portion is made of a second rubber material, and the wear resistance of the second rubber material is greater than the wear resistance of the first rubber material.

[0009] A further improved solution is: the friction portion has a radially recessed receiving groove, the embedded portion is received in the receiving groove, and the ratio of the height of the embedded portion to the height of the friction portion is not greater than 0.5.

[0010] A further improvement is that the sum of the volumes of the friction portion and the embedded portion accounts for 10%-40% of the volume of the entire brake rim.

[0011] A further improvement is as follows: the volute also includes a groove recessed from the end face of the mounting portion, the support portion includes a connecting portion mounted on the mounting portion, a skeleton connected to the connecting portion, a coupling portion connected to the skeleton, and a recessed portion recessed from the end face of the coupling portion, the friction portion includes a snap-fit ​​portion protruding from the end face, and the recessed portion is coupled to the snap-fit ​​portion.

[0012] A further improved solution is: the bottom plate assembly includes a foaming portion connected to the driving assembly, an epoxy plate installed on the foaming portion, and a metal piece installed on the epoxy plate, and the friction portion abuts against the metal piece.

[0013] A further improvement is that the cross-sectional width formed by the friction portion in the plane where the motor axis is located is smaller than the cross-sectional width formed by the metal part in the plane where the motor axis is located.

[0014] A further improvement is that the friction part and the metal part are in interference fit, and the interference amount of the interference fit is 0.5mm-1.2mm.

[0015] Compared with the prior art, the utility model has the following beneficial effects: by arranging a brake ring between the volute of the middle cover and the bottom plate assembly, the brake ring is composed of a support part, a friction part and an embedded part, the support part is combined with the friction part, and the embedded part is injection-molded and installed on the friction part. When replacing the brake ring, only the friction part needs to be replaced, which shortens the replacement time and does not require the replacement of the support part, thereby reducing costs. Specifically, the material of the support part and the friction part is rubber material, and the material of the embedded part is metal material. Without affecting the service life of the friction part, the rigidity of the friction part is increased by the metal embedded part, thereby reducing the volume of the friction part and reducing costs; in addition, the clamping part of the friction part is combined with the concave part of the support part, which is quick to replace and overcomes the friction caused by the rotation of the bottom plate assembly and the contact with the friction part, thereby achieving relative fixation of the friction part and the support part; finally, the friction part is abutted against the metal part, reducing the wear of the brake ring on the bottom plate assembly and increasing its service life. [Drawings]

[0016] The specific implementation of the utility model is further described in detail below in conjunction with the accompanying drawings:

[0017] Figure 1 It is a cross-sectional schematic diagram of the utility model sanding machine;

[0018] Figure 2 yes Figure 1 A partial cross-sectional schematic diagram of the sanding machine shown;

[0019] Figure 3 yes Figure 1 A schematic structural diagram of a bottom plate assembly of the sanding machine shown;

[0020] Figure 4 yes Figure 3 A schematic cross-sectional view of a bottom plate assembly of the sanding machine shown;

[0021] Figure 5 yes Figure 1 The structural schematic diagram of the brake ring of the sanding machine shown;

[0022] Figure 6 yes Figure 5 Schematic diagram of the exploded structure of the brake ring of the sanding machine shown. [Specific implementation method]

[0023] The utility model is further described in detail below in conjunction with the accompanying drawings and implementation modes.

[0024] The terms used in the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. For example, the words "upper", "lower", "front", "back", etc., which indicate the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device / element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0025] See also Figure 1 and Figure 2 As shown, an embodiment of the present invention relates to a sanding machine 100, including a housing 1, a driving assembly 2 installed in the housing 1, and a bottom plate assembly 3 driven by the driving assembly 2. The housing 1 includes a main housing 11 accommodated in the driving assembly 2 and an intermediate cover 12 connected to the main housing 11. The intermediate cover 12 is located between the main housing 11 and the bottom plate assembly 3, and sandpaper is installed on the bottom plate assembly 3. Under the action of the driving source, the sanding machine 110 drives the sandpaper on the bottom plate assembly to grind and polish the surface of the workpiece to be processed. Among them, the dust generated by grinding is sucked into the dust box 5 of the sanding machine 100 through the intermediate cover 12 to avoid polluting the environment and endangering human health.

[0026] In this embodiment, the sanding machine 100 also includes a brake ring 4 installed on the middle cover 12. The middle cover 12 has a volute 121 adjacent to the bottom plate assembly 3. One end of the brake ring 4 is combined with the volute 121, and the other end is abutted against the bottom plate assembly 3. The layout is ingenious, the structure is compact, and the height of the whole machine is not affected. The volute 121 has a mounting portion 1211 recessed from the edge. The brake ring 4 includes a support portion 41 installed on the mounting portion 1211, a friction portion 42 abutting against the bottom plate assembly 3, and an embedded portion 43 installed on the friction portion 42. The support portion 41 is combined with the friction portion 42. It should be noted that the support portion 41 and the friction portion 42 are preferably set separately, so that when the brake ring 4 fails to be replaced, the user only needs to replace the friction portion 42. The replacement is convenient and quick, and the waste of materials is avoided, thereby reducing the cost. In addition, the embedded portion 43 is injection-molded and installed on the friction portion 42, which reduces the volume of the friction portion 42 without affecting the braking effect of the brake ring, thereby reducing the cost.

[0027] Specifically, the support part 41 and the friction part 42 are made of rubber material. Furthermore, the support part 41 is made of a first rubber material, and the friction part 42 is made of a second rubber material. The wear resistance of the second rubber material is greater than that of the first rubber material, which reduces costs while improving the braking effect. It should be noted that the first material of the support part 41 as the main body can be selected from a cheap nitrile material, and the second material of the friction part 42 as the friction loss part can be fluororubber material. The above materials are not limited to this, and the purpose of reducing costs and improving cost performance is achieved without affecting the braking effect.

[0028] Furthermore, the embedded part 43 is made of metal. Without affecting the service life of the friction part, the rigidity of the friction part is increased by the metal embedded part, thereby reducing the volume of the friction part and reducing the cost.

[0029] See also Figure 5 and Figure 6 As shown, the friction portion 42 has a radially recessed receiving groove 421, and the embedded portion 43 is received in the receiving groove 421. The ratio of the height of the embedded portion 43 to the height of the friction portion 42 is not greater than 0.5. This size takes into account the cost while ensuring that the friction portion 42 has good rigidity and does not affect the braking effect of the brake ring 4.

[0030] The sum of the volumes of the friction portion 41 and the embedded portion 43 accounts for 10%-40% of the volume of the entire brake rim 4 . The volume of the more expensive fluororubber material in the entire brake rim 4 accounts for a relatively low proportion, but the part that is in effective contact and friction is the wear-resistant part that contacts the base plate assembly 3 .

[0031] See also Figures 2 to 6 As shown, the volute 121 also includes a groove 1212 recessed from the end face of the mounting portion 1211, the support portion 41 includes a connecting portion 411 mounted on the mounting portion 1211, a skeleton 412 connected to the connecting portion 411, a coupling portion 413 connected to the skeleton 412, and a concave portion 414 recessed from the end face of the coupling portion 413, and the friction portion 42 includes a snap-fit ​​portion 422 protruding from the end face, and the concave portion 414 is coupled to the snap-fit ​​portion 422. It should be noted that the number of snap-fit ​​portions 422 that can be set is 4-8, which, on the one hand, facilitates users to quickly replace the failed part of the brake rim; on the other hand, overcomes the friction caused by the rotation of the bottom plate assembly 3 and the contact with the friction portion 42, so as to achieve relative fixation of the friction portion 42 and the support portion 41.

[0032] In this embodiment, the bottom plate assembly 3 includes a foaming portion 31 connected to the driving assembly 2, an epoxy plate 32 installed on the foaming portion 31, and a metal part 33 installed on the epoxy plate 32, and the friction part 42 abuts against the metal part 33. It should be noted that the epoxy plate 31 and the brake ring 4 are both consumable parts, and the wear of either side will reduce the braking effect, so the metal part 33 is installed in the epoxy plate 32, and the friction part 42 directly contacts the metal part 33, thereby reducing the wear of the epoxy plate 32 and improving the service life of the bottom plate assembly 3.

[0033] Please refer to Figure 1As shown, the driving assembly 2 includes a motor axis 20 and a motor 21 that rotates along the motor axis 20. The motor 21 is used as a prime mover of the sanding machine 100 and is arranged in the main housing 11. The motor 21 includes a motor shaft 211 for transmitting power to the base plate assembly 3. The motor shaft 211 rotates along the motor axis 20, and the motor axis 20 extends substantially in the up-down direction.

[0034] Specifically, the cross-sectional width formed by the friction part 33 in the plane where the motor axis 20 is located is smaller than the cross-sectional width formed by the metal part 33 in the plane where the motor axis 20 is located, so that the friction part 42 is always within the cross-sectional width of the metal part 33. Further, the friction part 42 and the metal part 33 are interference fit, and the interference amount of the interference fit is 0.5mm-1.2mm, so as to avoid the metal part 33 and the friction part 42 from slipping due to the small friction force when the over-pressure contact occurs, so the interference amount is set to meet the braking effect brought by the over-pressure contact.

[0035] The utility model is not limited to the above specific implementation. Those skilled in the art can easily understand that there are many alternatives to the sanding machine of the utility model without departing from the principle and scope of the utility model. The protection scope of the utility model shall be based on the content of the claims.

Claims

1. A sanding machine, comprising a housing, a driving assembly installed in the housing, and a base assembly driven by the driving assembly, wherein the housing comprises a main housing accommodated in the driving assembly and an intermediate cover connected to the main housing, wherein the intermediate cover is located between the main housing and the base assembly, and the driving assembly has a motor axis; characterized in that: The sanding machine also includes a brake ring installed on the middle cover, the middle cover has a volute adjacent to the base plate assembly, one end of the brake ring is combined with the volute, and the other end abuts against the base plate assembly, the volute has a mounting portion recessed from an edge, the brake ring includes a supporting portion installed on the mounting portion, a friction portion abutting against the base plate assembly, and an embedded portion installed on the friction portion, the supporting portion is combined with the friction portion, and the embedded portion is injection molded and installed on the friction portion.

2. The sanding machine according to claim 1, characterized in that: The support part and the friction part are made of rubber, and the embedding part is made of metal.

3. The sanding machine according to claim 2, characterized in that: The support portion is made of a first rubber material, and the friction portion is made of a second rubber material, and the wear resistance of the second rubber material is greater than that of the first rubber material.

4. The sanding machine according to claim 2, characterized in that: The friction part has a radially recessed receiving groove, the embedded part is received in the receiving groove, and the ratio of the height of the embedded part to the height of the friction part is not greater than 0.

5.

5. The sanding machine according to claim 4, characterized in that: The sum of the volumes of the friction portion and the embedded portion accounts for 10%-40% of the volume of the entire brake rim.

6. The sanding machine according to claim 1, characterized in that: The volute also includes a groove recessed from the end face of the mounting portion, the support portion includes a connecting portion mounted on the mounting portion, a skeleton connected to the connecting portion, a coupling portion connected to the skeleton, and a recessed portion recessed from the end face of the coupling portion, the friction portion includes a snap-fit ​​portion protruding from the end face, and the recessed portion is coupled to the snap-fit ​​portion.

7. The sanding machine according to claim 1, characterized in that: The bottom plate assembly includes a foaming portion connected to the driving assembly, an epoxy plate installed on the foaming portion, and a metal piece installed on the epoxy plate, and the friction portion abuts against the metal piece.

8. The sanding machine according to claim 7, characterized in that: The cross-sectional width formed by the friction portion on the plane where the motor axis is located is smaller than the cross-sectional width formed by the metal part on the plane where the motor axis is located.

9. The sanding machine according to claim 8, characterized in that: The friction part and the metal part are in interference fit, and the interference amount of the interference fit is 0.5mm-1.2mm.

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