Speed-adjustable direct-current sanding machine

Abstract

The utility model discloses a speed-adjustable direct-current sander which comprises a direct-current motor, a sleeve is fixedly installed on the lower surface of the direct-current motor, an output shaft penetrates into the sleeve in a rotating mode, and a speed change mechanism is fixedly installed on the lower surface of the output shaft of the direct-current motor and rotates in the sleeve. The power output end of the speed change mechanism rotationally penetrates into the protective cover, the end of the power output end is fixedly connected with the grinding disc, and the protective cover is fixedly installed on the lower surface of the sleeve and covers the upper half portion of the outer surface of the grinding disc. Through the design of the speed change mechanism, a worker can regulate and control the transmission ratio of the polishing disc according to a to-be-polished material, the polishing disc can be adjusted to be high in rotating speed and low in torque for low-hardness materials such as soft wood, and the polishing disc is set to be low in rotating speed and high in torque for high-hardness metal materials; the sanding machine can be in the best working state, the problem of low efficiency caused by a fixed transmission ratio is avoided, and the performance of equipment is fully exerted.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of sander, concretely is adjustable speed DC sander. BACKGROUND

[0002] In the field of industrial manufacturing and hand processing, sanding operation is always a very key process. From the early simple rough polishing way to the current sanding process constantly pursuing high precision, high efficiency and diversification function, its development course has witnessed numerous technological innovations.

[0003] A kind of sander is disclosed in Chinese patent with announcement number CN117651625A, including airflow element (11), motor (51), battery pack. The airflow element (11) can rotate around center axis (102) in preset rotation direction to generate chip removal airflow;The motor (51) provides power for airflow element (11);And the battery pack provides energy for the motor (51). When the sander is in the state of no load, the battery pack consumes 10WH energy, defines the working time of the sander as a function time T of the sander. The product of the no-load rotating speed N of the motor and the function time T of the sander is greater than or equal to 63,000rpm.min, and less than or equal to 120,000rpm.min. The sander has small dust suction resistance and long endurance time.

[0004] However, the above-mentioned sander cannot increase the speed or change the torque without changing the power supply, and thus cannot adaptively adjust according to the actual situation. For example, when polishing metal, insufficient torque can cause the sander to slide on the surface, and the speed that is not suitable can leave scratches on the surface, affecting the quality of the final product. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing adjustable speed DC sander to solve the problem that the speed cannot be increased or the torque cannot be changed without changing the power supply in the above-mentioned background technology, and thus the adaptive adjustment cannot be made according to the actual situation.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0007] The adjustable speed DC sander comprises a DC motor, a sleeve fixedly installed on the lower surface of the DC motor and through which an output shaft rotates, a speed change mechanism fixedly installed on the lower surface of the output shaft of the DC motor and rotating in the sleeve, a power output end of the speed change mechanism rotating into a protective cover and fixedly connected with a polishing disc at the end, and the protective cover fixedly installed on the lower surface of the sleeve and covering the upper half of the outer surface of the polishing disc.

[0008] Preferably, the variable speed mechanism comprises a first conical cylinder, the first conical cylinder is rotatably arranged on the upper surface of the sleeve and fixedly connected with the output shaft of the direct current motor, the outer surface of the first conical cylinder is in abutment with a transmission wheel, the transmission wheel is rotatably arranged on the outer surface of a pushing column, the pushing column is slidably arranged in a sliding pipe, and the sliding pipe is fixedly arranged in the sleeve.

[0009] Preferably, the pushing column is screwedly provided with a winged bolt at one end, the threaded portion of the winged bolt is rotatable into a limiting groove, and the limiting groove is arranged at one end of a semicircular plate.

[0010] Preferably, the outer surface of the transmission wheel is in abutment with a second conical cylinder at the other end, the second conical cylinder is rotatably arranged on the lower surface of the sleeve, so that the transmission wheel is located between the first conical cylinder and the second conical cylinder, and the angles of the inclined surfaces between the first conical cylinder and the second conical cylinder are equal.

[0011] Preferably, the transmission wheel can be pushed to move between the first conical cylinder and the second conical cylinder through the pushing column, the contact positions of the transmission wheel with the outer surfaces of the first conical cylinder and the second conical cylinder change, since the diameters of the first conical cylinder and the second conical cylinder change along the axial direction, the transmission wheel can contact the positions with different diameters of the first conical cylinder and the second conical cylinder, which is equivalent to changing the transmission radius and the transmission ratio, so that the rotation speed of the polishing disc is adjusted.

[0012] Preferably, the rotating column of the lower surface of the second conical cylinder is rotatable into the cover, and the lower surface is fixedly provided with a first gear, the first gear is engaged with a second gear, the second gear is rotatably arranged on the lower surface of the sleeve and surrounded by the cover, and the lower surface of the second gear is fixedly provided with the polishing disc.

[0013] Compared with the prior art, the variable speed mechanism has the advantages that:

[0014] 1. Through the design of the direct current motor, sleeve, cover, polishing disc and speed change mechanism, when in use, the speed change mechanism can be rotated in the sleeve by starting the direct current motor, and the polishing disc fixedly installed on the lower surface can be rotated in the cover by the speed change mechanism, thereby the staff can hold the direct current motor to drive the polishing disc to polish the object, and in the process of the speed change mechanism driving the polishing disc to rotate, the staff can control the transmission ratio of the speed change mechanism according to the material to be polished, so as to realize self-adaptive control of the rotating speed and torque of the polishing disc, so that for materials with low hardness, such as soft wood, the polishing disc can be adjusted to high speed and low torque, so that the polishing surface is smoother and more delicate, and the material surface is not damaged due to excessive torque; for high-hardness metal materials, the polishing disc is set to low speed and high torque, which can ensure enough power to remove the defects, oxidation layer and the like on the material surface, and at the same time avoid overheating and deformation of the material surface due to high speed, and meet the high-precision surface quality requirement.

[0015] 2、through the design of the first cone, the push column, the transmission wheel, the second cone, the first gear and the second gear, when the direct current motor starts, the first cone can be driven to rotate in the sleeve by the output shaft, and then the first cone can drive the transmission wheel to rotate, so that the transmission wheel drives the second cone to rotate, and the first gear on the lower surface of the second cone can mesh with the second gear to rotate, and the polishing disc fixedly installed on the lower surface can rotate in the protective cover, when the torque of the polishing disc needs to be increased, the staff can push the push column to drive the transmission wheel rotatingly installed on the outer surface to move downward between the first cone and the second cone, which can change the contact position of the transmission wheel with the outer surfaces of the first cone and the second cone, since the diameters of the first cone and the second cone change along the axial direction, the transmission wheel can contact the first cone and the second cone at different diameter positions, that is, the short diameter part of the first cone contacts the long diameter part of the second cone, which is equivalent to changing the transmission radius, so that the transmission ratio is changed, that is, the torque of the polishing disc is increased, when the rotating speed of the polishing disc needs to be increased, the staff can pull the push column upward to drive the transmission wheel to move upward between the first cone and the second cone, that is, the long diameter part of the first cone contacts the short diameter part of the second cone, that is, the rotating speed of the polishing disc is increased, so that the staff can adjust the transmission ratio in real time according to the specific work requirements in actual work, so that the sander is always in the best working state, the efficiency is improved, the performance of the equipment is fully utilized, the rotating speed and the torque are increased by adjusting the transmission ratio, rather than overloading the direct current motor, the working pressure of the direct current motor is reduced, the heating and wear are reduced, and the service life is prolonged, and after the rotating speed or the torque of the polishing disc is adjusted, the staff can twist the butterfly bolt, so that the threaded part of the butterfly bolt rotates and penetrates into the limiting groove in the semicircular plate, that is, the sliding of the push column is locked, the push column can be prevented from sliding due to accidental touch, machine vibration and other factors, so that the rotating speed and the torque of the polishing disc are kept at the set value, and the stability and consistency of the polishing work are ensured. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the adjustable speed direct current sander of the utility model.

[0017] Figure 2 It is a schematic diagram of the structure of the speed change mechanism of the utility model.

[0018] Figure 3 It is a schematic diagram of the structure of the first cone and the second cone of the utility model.

[0019] In the diagram: 1. DC motor; 101. Sleeve; 102. Protective cover; 103. Grinding disc; 104. Sliding tube; 105. Limiting groove; 106. Semi-arc plate; 2. Speed ​​change mechanism; 201. First cone; 202. Pushing column; 203. Transmission wheel; 204. Second cone; 205. First gear; 206. Second gear; 207. Wing bolt. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] like Figure 1 As shown, this embodiment provides an adjustable speed DC sander, including: a DC motor 1, a sleeve 101 fixedly installed on the lower surface of the DC motor 1 for the output shaft to rotate through, a speed change mechanism 2 fixedly installed on the lower surface of the output shaft of the DC motor 1 and rotating inside the sleeve 101, the power output end of the speed change mechanism 2 rotating through the cover 102 and the end fixedly connected to the grinding disc 103, and the cover 102 fixedly installed on the lower surface of the sleeve 101 and covering the upper half of the outer surface of the grinding disc 103.

[0022] Through the design of the DC motor 1, sleeve 101, cover 102, grinding disc 103, and speed change mechanism 2, in use, the DC motor 1 is started to drive the speed change mechanism 2 to rotate within the sleeve 101. The speed change mechanism 2 then drives the grinding disc 103, which is fixedly mounted on the lower surface, to rotate within the cover 102. This allows the operator to hold the DC motor 1 and drive the grinding disc 103 to grind objects. Furthermore, during the rotation of the grinding disc 103 by the speed change mechanism 2, the operator can adjust the speed of the speed change mechanism 2 according to the material being ground. The transmission ratio is adjusted to achieve adaptive control of the rotational speed and torque of the grinding disc 103. For materials with low hardness, such as soft wood, the grinding disc 103 can be adjusted to high speed and low torque, which makes the grinding surface smoother and more delicate, and avoids damage to the material surface due to excessive torque. For metal materials with high hardness, the grinding disc 103 is set to low speed and high torque, which ensures sufficient force to remove defects and oxide layers from the material surface, while avoiding overheating and deformation of the material surface due to excessive speed, thus meeting the requirements of high-precision surface quality.

[0023] like Figures 2-3As shown, the transmission mechanism 2 includes a first cone cylinder 201, which is rotatably arranged on the upper surface of the sleeve 101 and fixedly connected with the output shaft of the DC motor 1. The outer surface of the first cone cylinder 201 is in abutment with a transmission wheel 203, which is rotatably arranged on the outer surface of a pushing column 202. The pushing column 202 is slidably arranged in a sliding pipe 104, which is fixedly arranged in the sleeve 101. The pushing column 202 is threadedly connected with a butterfly bolt 207 at one end. The threaded portion of the butterfly bolt 207 is rotatably arranged in a limiting groove 105, which is formed at one end of a semi-arc plate 106. The semi-arc plate 106 is fixedly arranged on the upper surface of the sliding pipe 104. The outer surface of the transmission wheel 203 is in abutment with a second cone cylinder 204, which is rotatably arranged on the lower surface of the sleeve 101. In this way, the transmission wheel 203 is arranged between the first cone cylinder 201 and the second cone cylinder 204. The angle of the inclined surface between the first cone cylinder 201 and the second cone cylinder 204 is equal. In this way, the transmission wheel 203 can be pushed to move between the first cone cylinder 201 and the second cone cylinder 204 by the pushing column 202. The contact position between the transmission wheel 203 and the outer surfaces of the first cone cylinder 201 and the second cone cylinder 204 changes. Since the diameters of the first cone cylinder 201 and the second cone cylinder 204 change along the axial direction, the transmission wheel 203 can contact the different diameter positions of the first cone cylinder 201 and the second cone cylinder 204, which is equivalent to changing the transmission radius, thereby changing the transmission ratio, achieving the adjustment of the rotating speed of the polishing disc 103.

[0024] The rotating column of the lower surface of the second cone cylinder 204 is rotatably arranged in the cover 102, and the lower surface is fixedly arranged with a first gear 205. The first gear 205 is in engagement with a second gear 206, which is rotatably arranged on the lower surface of the sleeve 101 and surrounded by the cover 102. The lower surface of the second gear 206 is fixedly arranged with the polishing disc 103.

[0025] By the design of the first taper cylinder 201, the pushing column 202, the transmission wheel 203, the second taper cylinder 204, the first gear 205 and the second gear 206, when the direct current motor 1 starts, the first taper cylinder 201 can be rotated in the sleeve 101 by the output shaft, and then the first taper cylinder 201 can drive the transmission wheel 203 to rotate, so that the transmission wheel 203 drives the second taper cylinder 204 to rotate, and the first gear 205 on the lower surface of the second taper cylinder 204 can mesh with the second gear 206 to rotate, and the polishing disc 103 fixedly installed on the lower surface can rotate in the protective cover 102, and when the torque of the polishing disc 103 needs to be increased, the staff can push the pushing column 202 to drive the transmission wheel 203 rotatingly installed on the outer surface to move downward between the first taper cylinder 201 and the second taper cylinder 204, which will change the contact position of the transmission wheel 203 with the outer surfaces of the first taper cylinder 201 and the second taper cylinder 204. Since the diameters of the first taper cylinder 201 and the second taper cylinder 204 change along the axial direction, the transmission wheel 203 can contact the first taper cylinder 201 and the second taper cylinder 204 at different diameter positions, that is, the short diameter part of the first taper cylinder 201 contacts the long diameter part of the second taper cylinder 204, which is equivalent to changing the transmission radius and thus changing the transmission ratio, that is, increasing the torsion of the polishing disc 103. When the speed of the polishing disc 103 needs to be increased, the staff can pull the pushing column 202 upward to drive the transmission wheel 203 to move upward between the first taper cylinder 201 and the second taper cylinder 204, that is, the long diameter part of the first taper cylinder 201 contacts the short diameter part of the second taper cylinder 204, that is, the speed of the polishing disc 103 is increased. The staff can adjust the transmission ratio in real time according to the specific work requirements in actual work, so that the sander is always in the best working state, avoids the problem of low efficiency caused by fixed transmission ratio, fully utilizes the performance of the equipment, and increases the speed and torque by adjusting the transmission ratio, rather than overloading the direct current motor 1, which can reduce the working pressure of the direct current motor 1, reduce heating and wear, and prolong the service life. After adjusting the speed or torque of the polishing disc 103, the staff can twist the butterfly bolt 207, so that the threaded part of the butterfly bolt 207 rotates and penetrates into the limiting groove 105 of the semicircular plate 106, that is, the sliding of the pushing column 202 is locked, which can prevent the pushing column 202 from sliding due to accidental touching, machine vibration and other factors, so that the speed and torque of the polishing disc 103 remain at the set value, ensuring the stability and consistency of the polishing work.

[0026] According to the above technical scheme, the working steps of the present scheme are summarized and combed: when in use, the first cone cylinder 201 can be rotated in the sleeve 101 by starting the direct current motor 1, and then the first cone cylinder 201 can drive the transmission wheel 203 to rotate, so that the transmission wheel 203 drives the second cone cylinder 204 to rotate, and the second cone cylinder 204 can drive the first gear 205 on the lower surface to mesh with the second gear 206 to rotate, and the polishing disc 103 fixedly installed on the lower surface can rotate in the protective cover 102, when the torque of the polishing disc 103 needs to be increased, the staff can push the push column 202 to drive the transmission wheel 203 rotatingly installed on the outer surface to move downward between the first cone cylinder 201 and the second cone cylinder 204, which will change the contact position of the outer surface of the first cone cylinder 201 and the second cone cylinder 204, since the diameters of the first cone cylinder 201 and the second cone cylinder 204 change along the axial direction, the transmission wheel 203 can contact the different diameter positions of the first cone cylinder 201 and the second cone cylinder 204, that is, the short diameter part of the first cone cylinder 201 contacts the long diameter part of the second cone cylinder 204, which is equivalent to changing the transmission radius, thereby changing the transmission ratio, that is, the torsion of the polishing disc 103 is increased, when the rotating speed of the polishing disc 103 needs to be increased, the transmission wheel 203 can be driven by pulling up the push column 202 to move upward between the first cone cylinder 201 and the second cone cylinder 204, that is, the long diameter part of the first cone cylinder 201 contacts the short diameter part of the second cone cylinder 204, that is, the rotating speed of the polishing disc 103 is increased, and after the rotating speed or the torque of the polishing disc 103 is adjusted, the staff can twist the butterfly bolt 207, so that the threaded part of the butterfly bolt 207 rotates and penetrates into the limiting groove 105 of the semi-arc plate 106, that is, the sliding of the push column 202 is locked, which can prevent the push column 202 from sliding due to accidental touching, machine vibration and other factors, so that the rotating speed and the torque of the polishing disc 103 remain at the set value, and the stability and consistency of the polishing work are ensured.

[0027] In summary: the adjustable speed direct current sander can allow the staff to adjust the transmission ratio of the polishing disc 103 according to the material to be polished, so that the polishing disc 103 can be adjusted to high rotating speed and low torque for materials with low hardness, such as soft wood, and the polishing disc 103 can be set to low rotating speed and high torque for materials with high hardness, such as metal materials, so that the sander can be in the best working state, and the low efficiency problem caused by fixed transmission ratio is avoided, and the performance of the equipment is fully utilized.

[0028] The parts not involved in the utility model are the same as the prior art or can be realized by using the prior art. Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A variable speed DC sander characterized by, Include: DC motor (1), the lower surface of the DC motor (1) is fixedly installed with sleeve (101) and is inserted by output shaft rotation, the output shaft lower surface of the DC motor (1) is fixedly installed with speed change mechanism (2) and rotates in sleeve (101), the power output end of speed change mechanism (2) rotates to cover (102) and the end is fixedly connected with polishing disc (103), the cover (102) is fixedly installed at the lower surface of sleeve (101) and covers the outer surface of polishing disc (103) on the half part.

2. The adjustable speed DC sander of claim 1, wherein: The speed change mechanism (2) includes a first cone (201), the first cone (201) rotates in the upper surface of sleeve (101) and is fixedly connected with the output shaft of DC motor (1), the outer surface of first cone (201) is in contact with transmission wheel (203), transmission wheel (203) is rotatably installed on the outer surface of push column (202), push column (202) is slidably installed in slide pipe (104), slide pipe (104) is fixedly installed in sleeve (101).

3. The adjustable speed DC sander of claim 2, wherein: One end of the push column (202) is threadedly installed with a butterfly bolt (207), the threaded portion of the butterfly bolt (207) can be rotatably inserted into the limiting groove (105), the limiting groove (105) is formed in one end of the semicircular plate (106), and the semicircular plate (106) is fixedly installed on the upper surface of the slide pipe (104).

4. The variable speed DC sander of claim 2, wherein: The outer surface of the transmission wheel (203) is in contact with the second cone (204) at the other end, the second cone (204) is rotatably installed on the lower surface of the sleeve (101), so that the transmission wheel (203) is between the first cone (201) and the second cone (204), and the angle of the inclined surface between the first cone (201) and the second cone (204) is equal.

5. The adjustable speed DC sander of claim 4, wherein: The transmission wheel (203) can be pushed by the push column (202) to move between the first cone (201) and the second cone (204), and the contact position of the transmission wheel (203) with the outer surfaces of the first cone (201) and the second cone (204) will change.

6. The adjustable speed DC sander of claim 5, wherein: The rotating column of the lower surface of the second cone (204) rotates out to the cover (102), and the first gear (205) is fixedly installed on the lower surface, the first gear (205) is engaged with the second gear (206), the second gear (206) is rotatably installed on the lower surface of the sleeve (101) and is surrounded by the cover (102), and the polishing disc (103) is fixedly installed on the lower surface of the second gear (206).

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