CN111805371A

CN111805371A - Multifunctional sander

Info

Publication number: CN111805371A
Application number: CN202010597504.1A
Authority: CN
Inventors: 匡生才
Original assignee: Nanjing Jiuchi Electromechanical Industry Co ltd
Current assignee: Nanjing Jiuchi Electromechanical Industry Co ltd
Priority date: 2020-06-28
Filing date: 2020-06-28
Publication date: 2020-10-23
Also published as: CN112171466A

Abstract

The invention relates to a multifunctional sander, and belongs to the technical field of electric tools. The multifunctional sander comprises a shell for accommodating a motor, wherein an eccentric wheel shaft is mounted on a vertical output shaft of the motor, the eccentric wheel shaft and a bearing ring on a polishing base plate form a hinge pair, and an insertion hole is formed in the outer circle of the bearing ring; the housing mounts a restraint having a first position and a second position; when the restraining member is in the first position, the inner end thereof enters the insertion hole; when the restraint member is in the second position, the inner end thereof is pulled out of the insertion hole. After the polishing machine is adopted, the bottom plate does not need to be replaced, and only through the regulation and control operation of the restraint part, the polishing conversion of ROS and OS can be conveniently realized, so that different use requirements are met.

Description

Multifunctional sander

Technical Field

The invention relates to a sanding machine, in particular to a multifunctional sanding machine, and belongs to the technical field of electric tools.

Background

A hand-held electric polishing tool for polishing the surface of workpiece is composed of a casing, a motor with vertical output shaft, and a polishing bottom plate connected to said output shaft via an eccentric mechanism. According to the constrained motion state of the polishing bottom plate, two major types of ROS and OS are mainly provided, the polishing bottom plate of the polishing bottom plate (Random Orbital Sander) is only articulated and constrained by an eccentric mechanism, and one motion degree of freedom is added, so that the motion track during polishing is affected by polishing damping, the polishing bottom plate has randomness, and is suitable for rough grinding, and the typical structure of the polishing bottom plate can be seen in Chinese patent document with application number of 200590000061.2; the grinding bottom plate of the latter (Orbital Sander) is constrained by the flexible part and the rigid part besides the eccentric transmission, so that the redundant degree of freedom is eliminated, the grinding track is determined, the grinding efficiency is relatively low, the grinding precision is high, and the grinding machine is suitable for fine grinding, and the typical structure can be seen in Chinese patent application No. 201920108832.3.

The grinding stock calculation and surface quality conditions for ROS and OS grinding can be seen in the table below.

Mode(s)	Amount of grinding	Surface quality
			ROS	Has spiral corrugation and is suitable for coarse grinding
OS		Has no spiral ripple and is suitable for fine grinding

In the above calculation formula

D-Sand table diameter, unit: mm;

p-number of sandpaper meshes, unit: one per square inch;

e-eccentric radius of sander, unit: mm;

b-width of effective grinding of sand, unit: mm;

h-effective grinding height of sand, unit: mm;

W_motor-motor speed, unit: r/min

W_padBottom plate rotation speed, unit: r/min.

To meet the need for a coarse and fine grinding change, chinese patent application No. 200920179834.8 discloses a tool for a moving abrasive, comprising a tool body; a drive system housed in the tool body and including an output member; a holding member provided on the tool body; a first platen having a first attachment hub and a first rotatable member; a second platen having a second attachment hub and a second rotatable member; and a mode selector provided on the tool body. By replacing the sanding sole, the conversion between the OS orbital motion and the ROS random orbital motion can be achieved with the same motion drive (see paragraph [0050 ]), without having to equip two sanding machines. However, this solution requires the provision of a plurality of sanding shoes, and therefore, it is still not convenient whether to replace or carry the shoes.

Disclosure of Invention

The invention aims to: aiming at the defects existing in the prior art, the multifunctional sander capable of realizing the switching between the ROS and the OS only needs to be simply adjusted through structural improvement, so that the sander is multifunctional.

In order to achieve the purposes, the basic technical scheme of the multifunctional sander is as follows: the grinding device comprises a shell for accommodating a motor, wherein an eccentric wheel shaft is arranged on a vertical output shaft of the motor, the eccentric wheel shaft and a bearing ring on a grinding base plate form a hinge joint pair, and an insertion hole is formed in the excircle of the bearing ring;

the housing mounts a restraint having a first position and a second position; when the restraining member is in the first position, the inner end thereof enters the insertion hole; when the restraint member is in the second position, the inner end thereof is pulled out of the insertion hole.

When the sander is used, after the inner end of the restraint piece is separated from the insertion hole, the motor drives the sanding bottom plate through the eccentric mechanism, and the sanding bottom plate is only hinged and restrained by the eccentric mechanism and has one more freedom of movement, so that ROS sanding can be realized; and after the inner end of the constraint piece enters the insertion hole, the polishing bottom plate is constrained by the constraint piece besides being constrained by the eccentric transmission, so that the redundant degree of freedom is eliminated, and the OS polishing can be realized. Therefore, after the polishing machine is adopted, the bottom plate does not need to be replaced, and only through the regulation and control operation of the restraint part, the ROS and the OS can be conveniently changed, so that different use requirements are met.

The invention further perfects that:

the shell is used as a restraint piece through a radial hole mounting pin with a threaded section, and an expanded hole with a limiting effect is arranged in the radial hole; the outer section of the pin is provided with an external thread matched with the thread section of the radial hole, and the middle part of the pin is provided with an expanding section corresponding to the expanding hole.

The shell is used as a restraint piece through a radial hole mounting pin, a diameter expanding hole for limiting is formed in the radial hole, and a circumferential clamping groove is formed in the outer section of the radial hole; the outer section of the pin is provided with a limiting pin matched with the circumferential clamping groove, and the middle part of the pin is provided with an expanding section corresponding to the expanding hole.

The diameter expanding section is abutted against a return spring positioned in the radial hole.

The diameter of the insertion hole is equal to the sum of the diameter of the inner end of the pin and the eccentricity of two times of the eccentric wheel.

The insertion hole is kidney-shaped, and the length of the insertion hole is larger than the sum of the diameter of the inner end of the pin and the eccentricity of two times of the eccentric wheel.

One end of the insertion hole is embedded into an adjusting block with an adjusting groove.

The inner diameter of the insertion hole is matched with the diameter of the inner end of the pin, and the pin is provided with a flexible inner end.

A vertical output shaft of the motor is provided with a balance fan blade with an eccentric wheel shaft at the lower end through a hoisting screw, the eccentric wheel shaft is provided with a bearing ring through a bearing, and a polishing bottom plate is arranged below the bearing ring through a fastener, so that the eccentric wheel shaft and the bearing ring on the polishing bottom plate form a hinge pair capable of rotating relatively.

Drawings

The invention will be further described with reference to the accompanying drawings.

FIG. 1 is a schematic structural diagram illustrating an inserted state of a restraining element according to an embodiment of the invention.

Fig. 2 is a schematic structural view illustrating a state in which a constraining member is released according to an embodiment of the present invention.

FIG. 3 is a schematic structural view of a second restraint member according to an embodiment of the invention in an inserted state.

Fig. 4 is a schematic structural view of a second constraining member of the embodiment of the present invention in a released state.

Fig. 5 is a schematic partial exploded perspective view according to a first embodiment of the present invention.

Fig. 6 is a schematic partial three-dimensional exploded structure diagram according to a second embodiment of the present invention.

Fig. 7 is a schematic diagram of a partially enlarged structure of a third embodiment of the present invention.

Detailed Description

Example one

As shown in fig. 1 and 2, in the multifunctional sander of this embodiment, a motor 2 is disposed in the front end of an involutory structure housing 1 whose rear end extends out of a handle 1-1, a vertical output shaft 2-1 of the motor 2 is provided with a balance fan blade 3 whose lower end is provided with an eccentric wheel shaft 3-1 through a fastening screw 2-2, the eccentric wheel shaft 3-1 is provided with a bearing ring 4 through a bearing 3-2, and a sanding bottom plate 5 is provided below the bearing ring 4 through a connecting screw 5-1, so that the eccentric wheel shaft 3-1 and the bearing ring 4 on the sanding bottom plate 5 form a hinge pair capable of rotating relatively. A sanding layer 5-2 is attached to the lower surface of the sanding bottom plate 5 as required. The outer circle of the bearing ring 4 has a radial insertion hole 4-1. The housing 1 is fitted through a threaded radial bore 1-2 with a pin 6 having a first position and a second position as a restraint.

An expanding hole 1-4 for limiting is arranged in the radial hole 1-2, the outer section of the pin 6 is provided with an external thread 6-3 matched with the thread section of the radial hole and an outer end knob 6-1, and the middle part is provided with an expanding section 6-2 corresponding to the expanding hole 1-4. The expanding section 6-2 is abutted against a return spring 7 positioned in the radial hole 1-2. When the pin 6 is screwed to be in the first position, the inner end of the pin enters the insertion hole 4-1, and the diameter of the insertion hole 4-1 is equal to the sum of the diameter of the inner end of the pin and the eccentricity of two times of the eccentric wheel, so that the polishing bottom plate 5 is constrained by the pin besides the eccentric transmission, has no redundant degree of freedom, and can be used for OS polishing after the sander is started. When the pin is screwed 6 to the second position, its inner end is out of the insertion hole 4-1, and now as shown in fig. 2, the polishing base plate 5 is only constrained by the hinge of the eccentric mechanism, and one more degree of freedom of movement is provided, thus serving to perform ROS polishing. As a result, the bottom plate does not need to be replaced, and only by regulating and controlling the pins, the ROS and the OS can be conveniently ground, so that different use requirements are met.

In fact, since the insertion hole 4-1 is only horizontally constrained, it is entirely possible to make a kidney-shaped hole as shown in fig. 5, provided that its horizontal length is equal to the sum of the diameter of the inner end of the pin and twice the eccentricity of the eccentric. Therefore, the height direction of the sander is more compact, and the size of the height direction of the waist-shaped hole is in movable fit with the diameter of the pin, so that the movement stability of the base plate is kept. Of course, the inner diameter of the insertion hole can also be matched with the diameter of the inner end of the pin, and at the moment, the inner end of the pin is flexible and can adapt to the displacement of twice the eccentricity of the eccentric wheel.

Example two

The basic structure of the multifunctional sander is the same as that of the first embodiment as shown in fig. 3 and 4, except that, as shown in fig. 6, the outer section of the radial hole 1-2 is provided with a circumferential clamping groove 1-5, while the outer section of the pin 6 is provided with a stop pin 6-4 matched with the outer section of the radial hole, and is not threaded. When the grinding mode is switched, the pressing pin 6 overcomes the acting force of the return spring 7, the inner end of the pressing pin abuts against the outer circle of the bearing ring 4, the inserting hole 4-1 can be inserted when the ring rotates to a certain position, then the pin is screwed to enable the limiting pin 6-4 to be clamped into the circumferential clamping groove 1-5 for positioning, and in the first embodiment, the inner end of the pressing pin is not required to be aligned with the inserting hole before the pin is screwed.

EXAMPLE III

The basic structure of the multifunctional sander of the embodiment is the same as that of the embodiment, except that the length of the insertion hole 4-1 is longer than the sum of the diameter of the inner end of the pin and the eccentricity of twice the eccentric wheel as shown in fig. 7, and one end of the insertion hole is embedded into the adjusting block 4-2 with the adjusting groove 4-3, so that the length L of the insertion hole 4-1 is adjusted by the fastener 4-4 to be equal to or longer than the sum of the diameter of the inner end of the pin and the eccentricity of twice the eccentric wheel. When the pin is inserted and the acting length L is adjusted to be equal to the sum of the diameter of the inner end of the pin and the eccentricity of two times of the eccentric wheel, OS polishing is realized; when the pin is inserted and the action length L is adjusted to be larger than the sum of the diameter of the inner end of the pin and the eccentricity of two times of the eccentric wheel, the unique ROS and OS mixed grinding can be realized. When the acting length L of the pin is in the range of the sum of the diameter of the inner end of the pin and the eccentricity of two times of the eccentric wheel, the sander polishes OS, and if the acting length L of the pin is beyond the range, the sander polishes ROS; and the ratio of ROS to OS action in one grinding cycle can be adjusted within a certain range by means of the adjusting block 4-2. Experiments show that the unprecedented unique mixed polishing can generate polishing effect which can not be realized by ROS and OS polishing, and is particularly suitable for high-efficiency polishing of special materials with compact texture, so that the sander can have wider adaptability.

In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.

Claims

1. The utility model provides a multi-functional grinder, is including the casing of settling the motor, the vertical output shaft of motor is equipped with the eccentric shaft, the eccentric shaft constitutes articulated pair, its characterized in that with the bearing ring on the bottom plate of polishing: the outer circle of the bearing ring is provided with an insertion hole;

2. The multifunctional sander as set forth in claim 1, wherein: the shell is used as a restraint piece through a radial hole mounting pin with a threaded section, and an expanded hole with a limiting effect is arranged in the radial hole; the outer section of the pin is provided with an external thread matched with the thread section of the radial hole, and the middle part of the pin is provided with an expanding section corresponding to the expanding hole.

3. The multifunctional sander as set forth in claim 1, wherein: the shell is used as a restraint piece through a radial hole mounting pin, a diameter expanding hole for limiting is formed in the radial hole, and a circumferential clamping groove is formed in the outer section of the radial hole; the outer section of the pin is provided with a limiting pin matched with the circumferential clamping groove, and the middle part of the pin is provided with an expanding section corresponding to the expanding hole.

4. A multifunction sander as set forth in claim 2 or 3, wherein: the diameter expanding section is abutted against a return spring positioned in the radial hole.

5. A multifunction sander as set forth in claim 2 or 3, wherein: the diameter of the insertion hole is equal to the sum of the diameter of the inner end of the pin and the eccentricity of two times of the eccentric wheel.

6. A multifunction sander as set forth in claim 2 or 3, wherein: the insertion hole is kidney-shaped, and the length of the insertion hole is larger than the sum of the diameter of the inner end of the pin and the eccentricity of two times of the eccentric wheel.

7. The multifunctional sanding machine according to claim 6, characterized in that: one end of the insertion hole is embedded into an adjusting block with an adjusting groove.

8. A multifunction sander as set forth in claim 2 or 3, wherein: the inner diameter of the insertion hole is matched with the diameter of the inner end of the pin, and the pin is provided with a flexible inner end.

9. A multifunction sander as set forth in claim 1, 2 or 3, wherein: a vertical output shaft of the motor is provided with a balance fan blade with an eccentric wheel shaft at the lower end through a hoisting screw, the eccentric wheel shaft is provided with a bearing ring through a bearing, and a polishing bottom plate is arranged below the bearing ring through a fastener, so that the eccentric wheel shaft and the bearing ring on the polishing bottom plate form a hinge pair capable of rotating relatively.