WO2022105741A1 - 砂光机 - Google Patents

砂光机 Download PDF

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Publication number
WO2022105741A1
WO2022105741A1 PCT/CN2021/130880 CN2021130880W WO2022105741A1 WO 2022105741 A1 WO2022105741 A1 WO 2022105741A1 CN 2021130880 W CN2021130880 W CN 2021130880W WO 2022105741 A1 WO2022105741 A1 WO 2022105741A1
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WO
WIPO (PCT)
Prior art keywords
fan
weight
motor
equal
bottom plate
Prior art date
Application number
PCT/CN2021/130880
Other languages
English (en)
French (fr)
Inventor
张锐
付祥青
Original Assignee
南京泉峰科技有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 南京泉峰科技有限公司 filed Critical 南京泉峰科技有限公司
Priority to EP21893888.4A priority Critical patent/EP4230346A4/en
Publication of WO2022105741A1 publication Critical patent/WO2022105741A1/zh
Priority to US18/314,233 priority patent/US20230271296A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/04—Portable grinding machines, e.g. hand-guided; Accessories therefor with oscillating grinding tools; Accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
    • B24B23/03—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor the tool being driven in a combined movement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/04—Headstocks; Working-spindles; Features relating thereto
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/04—Headstocks; Working-spindles; Features relating thereto
    • B24B41/042—Balancing mechanisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B47/00—Drives or gearings; Equipment therefor
    • B24B47/10—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces
    • B24B47/12—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces by mechanical gearing or electric power
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
    • B24B55/06—Dust extraction equipment on grinding or polishing machines
    • B24B55/10—Dust extraction equipment on grinding or polishing machines specially designed for portable grinding machines, e.g. hand-guided
    • B24B55/102—Dust extraction equipment on grinding or polishing machines specially designed for portable grinding machines, e.g. hand-guided with rotating tools

Definitions

  • the present application relates to a power tool, such as a sander.
  • Sanders are becoming more and more popular as a grinding and polishing tool.
  • it is mainly used for cleaning, dehairing, polishing, etc. of the surfaces of machinery, building decoration, furniture paint, etc.
  • structure it usually includes: casing, motor, fan assembly, eccentric element, base plate assembly, etc.
  • the casing is used for accommodating the motor, the fan assembly and the eccentric element
  • the base plate assembly is at least partially placed outside the casing
  • the base plate assembly is used for connecting sandpaper.
  • the eccentric element drives the base plate assembly to move with the motor axis of the motor, so as to realize the grinding and polishing of the workpiece to be polished with sandpaper
  • the fan assembly is used to generate dust-collecting airflow and fan hot airflow when the motor is running.
  • the sander In order to reduce the vibration generated when the machine is running, the sander often sets a balance structure to balance the bottom plate components.
  • the balance structure In order to facilitate installation and simplify the structure, the balance structure will be directly connected to the eccentric element and/or The fan assembly is fixedly connected or integrally formed, but this setting tends to make the center of mass of the balance structure too high, and then the distance between the center of mass of the balance structure and the center of mass of the base plate assembly increases, which increases the torque between the centers of mass.
  • the present application provides a lightweight sander.
  • a sanding machine comprising: a casing; a motor, at least partially disposed in the casing, for providing a power source, the motor comprising a motor shaft that rotates around the axis of the motor; a fan assembly, including A fan connected by a motor; an eccentric element, driven by the motor, the eccentric element has a central axis arranged separately from the motor axis; a base plate assembly, comprising a base plate and a support for supporting the eccentric element, the support includes a first end face arranged oppositely and a The second end face, the second end face is close to the lower surface relative to the first end face; the sanding machine also includes a balance block, which is connected with the eccentric element and is driven by the motor to rotate around the central axis; the distance from the center of mass of the balance block to the lower surface of the bottom plate is related to the support member The ratio of the distance from the first end surface of the bottom plate to the lower surface of the bottom plate is greater than or equal
  • the balance block includes: a body, the body is connected with the eccentric element; a center of mass adjustment part, the center of mass adjustment part is used to adjust the center of mass of the balance block; wherein, the center of mass adjustment part is fixedly connected with the body or integrally formed.
  • the base plate assembly also includes a support seat for installing the support piece, the support base is fixedly connected with the base plate, and the support base includes an escape groove for allowing the balance weight to rotate.
  • the base plate includes grooves that allow movement of the counterweight, which at least partially overlaps the base plate in its axial direction.
  • the groove is a circular groove, and the center of the groove is located on the central axis, and the ratio of the inner diameter of the groove to the outer diameter of the bottom plate is greater than or equal to 0.25 and less than or equal to 0.4.
  • the balance block includes a weight increase part and a weight reduction part, the weight reduction part is arranged on the side of the balance block facing the bottom plate, and the weight increase part is arranged on the side of the balance block facing the fan;
  • the balance block includes a weight-increasing part and a weight-reduction part, the weight-reduction part is arranged on the side of the balance block facing the fan, and the weight-increasing part is arranged on the side of the balance block facing the bottom plate.
  • the product of the weight of the fan and the square of the outer diameter of the fan is greater than or equal to 40 kg/cm 2 and less than or equal to 200 kg/cm 2 .
  • the ratio of the weight of the fan to the mass of the motor is greater than or equal to 3% and less than or equal to 25%.
  • a sanding machine comprising: a casing; a motor, at least partially arranged in the casing, for providing a power source, the motor including a motor shaft that rotates around the axis of the motor; a fan assembly, including a fan connected to the motor; an eccentric The element is driven by a motor, and the eccentric element has a central axis that is offset from the motor axis;
  • the base plate assembly includes a base plate, a grinding piece fixed on the lower surface of the base plate, and a support for supporting the eccentric element, and the support includes a relatively arranged The first end face and the second end face, the second end face is arranged on the side close to the lower surface relative to the first end face;
  • the sander also includes a balance block, which is connected with the eccentric element and is driven by the motor to rotate around the central axis; the center of mass of the balance block is The ratio of the distance from the bottom surface of the bottom plate to the distance from the first end surface of the support to the bottom surface of the bottom plate is
  • the fan is located on the upper side of the balance block in the direction along the axis of the motor, wherein the density of the fan is less than 6.5 g/cm 3 .
  • the base plate includes grooves that allow movement of the counterweight, which at least partially overlaps the base plate in its axial direction.
  • the groove is a circular groove coaxial with the central axis, and the ratio of the inner diameter of the groove to the outer diameter of the bottom plate is greater than or equal to 0.25 and less than or equal to 0.4.
  • the ratio of the weight of the fan to the mass of the motor is greater than or equal to 3% and less than or equal to 25%.
  • the balance block includes a weight increase part and a weight reduction part, the weight reduction part is arranged on the side of the balance block facing the bottom plate, and the weight increase part is arranged on the side of the balance block facing the fan;
  • the balance block includes a weight-increasing part and a weight-reduction part, the weight-reduction part is arranged on the side of the balance block facing the fan, and the weight-increasing part is arranged on the side of the balance block facing the bottom plate.
  • the torque between the center of mass of the balance block and the center of mass of the bottom plate assembly is reduced, thereby reducing the weight of the balance block and the weight of the sanding machine.
  • FIG. 1 is a perspective view of a sanding machine shown in the present application
  • Fig. 2 is the structural plan view of the power assembly, the fan assembly and the base plate assembly of the sanding machine shown in Fig. 1;
  • FIG. 3 is a cross-sectional view of the structure shown in FIG. 2 along the axis of the motor;
  • Fig. 4 is the exploded view of the structure shown in Fig. 2;
  • FIG. 5 is an exploded view of the structure shown in FIG. 2 from another perspective;
  • Fig. 6 is the perspective view of the fan in the structure shown in Fig. 4;
  • FIG. 7 is a perspective view of the fan in the structure shown in FIG. 4 from another perspective;
  • FIG. 8 is a perspective view of a balance block in the structure shown in FIG. 4;
  • FIG. 9 is a perspective view of the balance weight in the structure shown in FIG. 4 from another perspective.
  • FIG. 1 shows a sanding machine 100, which can drive a functional element to move, and the functional element can be sandpaper, so that the sanding machine 100 can sand and smooth the surfaces of workpieces of various materials through the functional elements.
  • the sanding machine 100 may specifically be round sand, triangular sand, square sand, and the like.
  • the present application specifically takes round sand as an example.
  • FIG. 1 For convenience of description, upper, lower, front, rear, left and right as shown in FIG. 1 are defined.
  • the sanding machine 100 includes: a casing 10 , a switch 111 , a base plate assembly 40 , a power assembly 20 , a fan assembly 30 , an eccentric element 50 and an energy source (not shown).
  • the casing 10 is used as the outer shape part of the sanding machine 100 , and the casing 10 is formed with at least a handle part 110 , a accommodating part 120 and a bracket part 130 .
  • the handle part 110 is used for the user to hold, one end of the handle part 110 is connected to the accommodating part 120 , and the other end can be used to connect an external power cable, or form a connection seat for installing a portable DC power supply such as a battery pack.
  • the accommodating part 120 is located between the handle part 110 and the bracket part 130 , an accommodating cavity is formed inside the accommodating part 120 , and the power assembly 20 is at least partially disposed in the accommodating cavity.
  • the bracket portion 130 is used to cover the fan assembly 30 and at least part of the bottom plate assembly 40 .
  • the switch 111 can be installed on the casing 10 . Specifically, the switch 111 is installed on the handle portion 110 , so that when the user holds the handle portion 110 , the switch 111 can be triggered relatively conveniently.
  • the power assembly 20 includes a motor 21 , and the motor 21 serves as the prime mover of the sanding machine 100 and is arranged in the casing 10 .
  • the motor 21 includes a motor shaft 211 for transmitting power to the fan assembly 30 , and the motor shaft 211 rotates about the motor axis 101 .
  • the motor axis 101 extends substantially in the up-down direction.
  • the fan assembly 30 includes a fan 31 , which can be driven by the motor shaft 211 to rotate around the motor axis 101 , and can generate airflow when the fan 31 is driven by the motor shaft 211 to rotate.
  • the eccentric element 50 surrounds the motor shaft 211 , and the eccentric element 50 is eccentrically arranged relative to the motor shaft 211 .
  • the eccentric element 50 is mounted on the motor shaft 211 and is fixedly connected with the motor shaft 211 .
  • the eccentric arrangement of the eccentric element 50 and the motor shaft 211 means that the eccentric element 50 has a central axis 102, the central axis 102 and the motor axis 101 of the motor shaft 211 are parallel to each other and there is a distance between them D. The existence of the distance D enables the eccentric element 50 to transmit the rotation of the motor shaft 211 to the rotation and revolution of other components connected with the eccentric element 50 when the motor shaft 211 rotates.
  • the motor shaft 211 can drive the bottom plate assembly 40 so that the bottom plate assembly 40 can swing relative to the casing 10 .
  • the base plate assembly 40 is fixedly connected with the eccentric element 50 , that is, the motor shaft 211 transmits power to the base plate assembly 40 through the eccentric element 50 .
  • the base plate assembly 40 includes a base plate 41, the base plate 41 includes an upper surface 411 and a lower surface 412 arranged oppositely, and the lower surface 412 is disposed on the side away from the eccentric element 50 relative to the upper surface 411, wherein the lower surface 412 is used for installing functional elements such as sandpaper .
  • the bottom plate 41 can perform eccentric movement.
  • the sandpaper can continuously rub on the surface of the workpiece to be ground, thereby realizing the functions of grinding and polishing the workpiece to be ground.
  • the energy source is used to provide the sander 100 with an energy source, and the energy source may be alternating current or direct current, such as a portable mobile power source such as a battery pack. In this embodiment, the energy source adopts alternating current.
  • the base plate assembly 40 further includes a support member 42 and a support base 43 .
  • the support 42 is used to reduce the friction coefficient when the motor shaft 211 rotates with the eccentric element 50 disposed on the motor shaft 211 , so as to ensure the rotation accuracy and parallelism of the motor shaft 211 .
  • the support 42 is sleeved on the eccentric element 50 and is fixedly connected with the eccentric element 50 .
  • the support member 42 is a rolling bearing, and the rolling bearing 42 includes an outer ring, an inner ring and balls.
  • the inner ring is sleeved on the motor shaft 211 and is fixedly connected with the motor shaft 211 .
  • the outer ring is fixedly connected with the support base 43 and is arranged around the inner ring.
  • the balls are arranged between the outer ring and the inner ring to enable the outer ring to move relative to the inner ring.
  • the support base 43 is used to mount the support member 42 .
  • the support base 43 is fixedly connected with the outer ring of the support member 42 , that is, the outer ring of the support member 42 and the support base 43 form a synchronous connection.
  • the support base 43 is fixedly connected with the base plate 41 , that is to say, the base plate 41 can form a synchronous movement with the support base 43 and the outer ring of the support member 42 .
  • the sander 100 further includes a balance assembly 60 for balancing the base plate assembly 40 .
  • the balance assembly 60 includes a balance weight 61, which is located between the fan 31 and the bottom plate 41 in the direction along the motor axis 101, and the balance weight 61 and the eccentric element 50 are detachable and fixedly connected, that is, the eccentric element 50 Synchronous movement is formed with the balance weight 61 , and the balance weight 61 can rotate around the central axis 102 with the eccentric element 50 .
  • the detachable fixed connection between the balance weight 61 and the eccentric element 50 means that the balance weight 61 and the eccentric element 50 are two separable parts, which can be screwed, screwed or It is a connection method such as a snap connection that is fixed together so that a synchronous rotation can be formed between the two.
  • the balance weight 61 and the eccentric element 50 are connected by screws.
  • the balance assembly 60 includes at least one fixing piece, and the fixing piece is specifically a positioning screw. 61 abuts against the inner ring of the support member 42, and finally locks the balance weight 61 to the eccentric element 50, so as to realize the synchronous rotation of the balance weight 61 and the eccentric element 50.
  • One side is inserted into the connecting hole of the balance weight 61, so as to be fixed with the eccentric element 50, that is, synchronous rotation is formed.
  • the balance block 61 to support the inner ring of the support member 42, that is to say, it is not necessary to provide an additional positioning retaining ring to prevent the inner ring of the support member 42 from being separated from the support member 42 during the operation of the sanding machine 100.
  • the situation of the outer ring simplifies the structure and makes the structure of the whole machine more compact.
  • the support member 42 further includes a first end surface 421 and a second end surface 422 disposed opposite to each other, and the second end surface 422 is disposed on a side close to the lower surface 412 of the bottom plate 41 relative to the first end surface 421 . That is, in the direction along the motor axis 101 , the first end surface 421 is provided on the upper side of the second end surface 422 .
  • the ratio of the distance H1 from the center of mass A of the balance weight 61 to the lower surface 412 of the bottom plate 41 to the distance H2 from the first end surface 421 of the support member 42 to the bottom surface 412 of the bottom plate 41 is greater than or equal to 0.2 and less than or equal to 0.4.
  • the center of mass A of the balance weight 61 is set adjacent to the base plate 41, and the position of the center of mass A of the balance weight 61 is set within the above range, so that the center of mass A of the balance weight 61 is set close to the center of mass B of the base plate assembly 40, which can reduce the center of mass of the balance weight 61
  • the distance between A and the center of mass B of the bottom plate assembly 40 can greatly reduce the weight of the balance block 61, thereby reducing the weight of the sanding machine 100 as a whole.
  • the center of mass A of the balance weight 61 is located between the bottom plate 41 and the support member 42 , wherein, in the direction along the motor axis 101 , the distance D1 from the center of mass A of the balance weight 61 to the center of mass B of the bottom plate assembly 40 is greater than equal to 0mm and less than or equal to 2mm.
  • the balance weight 61 is used to realize the double balance of mass balance and torque balance of the base plate assembly 40. Through the above setting, the center of mass A of the balance weight 61 is adjacent to the center of mass B of the base plate assembly 40, and the center of mass A of the balance weight 61 is reduced to the base plate assembly 40.
  • the balance weight 61 can reduce the weight used to balance the torque.
  • the weight of the balance block 61 can be greatly reduced, thereby reducing the weight of the sanding machine 100, which is convenient for the user to operate, reduces the weight of the whole machine, and reduces the user's sense of fatigue.
  • the distance D1 from the center of mass A of the balance weight 61 to the center of mass B of the bottom plate assembly 40 is greater than or equal to 0 mm and less than or equal to 1 mm, and within the above range, the effect is better.
  • the balance weight 61 further includes a main body 63 and a center of mass adjusting part 62 .
  • the body 63 is connected to the eccentric element.
  • the center of mass adjusting portion 62 is used to adjust the center of mass of the balance weight 61 , and the center of mass adjusting portion 62 is fixedly connected with the body 63 or integrally formed.
  • the center of mass adjusting portion 62 is integrally formed with the body 63 .
  • the center of mass adjustment part 62 includes a weight increase part and a weight reduction part, the weight increase part is used to increase the weight of the balance weight 61 , and the weight reduction part is used to reduce the weight of the balance weight 61 .
  • the weight reduction portion is disposed on the side of the balance block 61 facing the bottom plate 41
  • the weight increase portion is disposed on the side of the balance block 61 facing the fan 31 .
  • the weight reduction part is provided on the side of the balance block 61 facing the fan 31
  • the weight increase part is provided on the side of the balance block 61 facing the bottom plate 41 .
  • the above setting that is, setting a center of mass adjustment part 62 on the balance block 61, can adjust the center of mass by making corresponding adjustments to the weight gain part and the weight loss part according to the weight and eccentricity of the base plate assembly 40. position so as to balance the weight and torque of the base plate assembly 40 .
  • a center-of-mass adjusting portion 62 extending upward for increasing the weight of the balance weight 61 may be provided, or a center-of-mass adjusting portion 62 extending downward for reducing the weight of the balance weight 61 .
  • the balance weight 61 is located between the support base 43 and the bottom plate 41 , and the balance weight 61 is at least partially disposed in the bottom plate 41 .
  • the balance weight 61 includes a first surface 611 and a second surface 612 which are arranged opposite to each other, the first surface 611 is arranged away from the bottom plate 41 relative to the second surface 612 , and the second surface 612 is located below the fixing member in the direction along the motor axis 101 . side. That is, the first surface 611 at least partially abuts against the inner ring of the support member 42 , and the second surface 612 is disposed adjacent to the upper surface 411 of the bottom plate 41 .
  • the upper surface 411 of the bottom plate 41 is recessed downward to form a groove 413 for the balance block 61 to move, and the second surface 612 of the balance block 61 extends toward the recessed direction of the groove 413. It can also be said that the balance block 61 and the bottom plate 41 partially overlaps in its axial direction.
  • the groove 413 is a circular groove coaxial with the central axis 102 , and the ratio of the inner diameter of the groove 413 to the outer diameter of the bottom plate 41 is greater than or equal to 0.25 and less than or equal to 0.4.
  • the radius C of the groove 413 is greater than or equal to 16 mm and less than or equal to 50 mm.
  • the balance weight 61 is arranged as close to the bottom plate 41 as possible, so that the center of mass A of the balance weight 61 is closer to the bottom plate 41, which shortens the torque and also reduces the torque. It can shorten the size of the whole machine in the up and down direction, thereby not only making the structure of the whole machine more compact, but also reducing the weight of the whole machine.
  • the balance block 61 is at least partially disposed in the support base 43, and the support base 43 is formed with an escape groove 431 and an accommodation groove 432.
  • the escape groove 431 is located outside the accommodation groove 432.
  • the groove 432 is formed by the upward depression of the end surface of the support base 43 close to the upper surface 411 of the bottom plate 41 .
  • the accommodating groove 432 is used for accommodating the supporting member 42 , wherein the wall surface of the accommodating groove 432 is at least partially in contact with the outer ring of the supporting member 42 .
  • the escape groove 431 partially overlaps with the support member 42 in the axial direction.
  • the avoidance groove 431 is used for the movement of the balance block 61, wherein the radius E of the avoidance groove 431 is greater than or equal to 20mm.
  • the second surface 612 The first surface 611 The first surface 611
  • the eccentric element 50 is fixedly connected or integrally formed with the fan 31 .
  • the eccentric element 50 is integrally formed with the fan 31 , that is, the eccentric element 50 is formed on the fan 31 .
  • the fan 31 is mounted on the motor shaft 211 and can be driven by the motor shaft 211 to rotate. Of course, it can also be said that the fan 31 is the eccentric element 50 .
  • the ratio of the weight of the fan 31 to the weight of the motor 21 is 3% or more and 25% or less. Under the condition that the weight of the motor 21 is constant, the smaller the weight of the fan 31 accounts for the weight of the motor 21, the lighter the weight of the fan 31, that is, the smaller the moment of inertia generated by the fan 31 when it rotates, which can greatly improve the user's sense of operation. . On the other hand, the lighter the weight of the fan 31 is, that is, the weight of the entire sander 100 is reduced, which is convenient for the user to hold.
  • the fan 31 uses a material with a density of less than 6.5g/cm 3 , because the weight is proportional to the density, that is, the smaller the density, the smaller the weight of the fan 31, which effectively reduces the weight of the fan 31, thereby reducing the weight of the fan 31.
  • the weight of the sander 100 is reduced.
  • the fan 31 uses a material with a density of 1 g/cm 3 or more and less than or equal to 3 g/cm 3 , the weight of the fan 31 can be reduced while satisfying the structural strength.
  • the fan 31 made of aluminum material can be used, which can save the cost while reducing the weight of the fan 31 .
  • rotation constraint force which will constrain the sander 100 to continue to rotate around the up-down direction when the sander 100 has a tendency to move in a direction that is inclined and intersected with the up-down direction, that is to say, the user will
  • the binding force will cause the sander 100 to have a tendency to move in the opposite direction of the sander 100, which requires the user Applying more force to overcome the restraining force will cause inconvenience in operation, and such operation for a long time will easily make the user feel fatigued and affect work efficiency.
  • the moment of inertia is proportional to the weight. The greater the weight of the fan 31, the greater the moment of inertia and the greater the impact on the user. Therefore, the above setting can reduce the moment of inertia, thereby improving the user's experience.
  • the ratio range of the product of the weight of the fan 31 and the square of the outer diameter is greater than or equal to 40 kg/cm 2 and less than or equal to 200 kg/cm 2 .
  • the outer diameter refers to the radius of the outer edge of the fan 31 .
  • the total weight of the weight of the fan 31 and the weight of the motor 21 is less than or equal to 400 g.
  • the weights of the motor 21 and the fan 31 are relatively heavy relative to the weight of other components, that is to say, the weight of the sander 100 is mainly concentrated on the motor 21 and the fan 31 .
  • the weight of the fan 31 is greatly reduced, thereby obtaining a sander 100 with a smaller moment of inertia and lighter weight.
  • the weight of the fan 31 is less than or equal to 80g.
  • an air inlet, an air outlet and a dust outlet are formed on the casing 10 .
  • the fan 31 is fixedly connected to the motor shaft 211 , that is, when the motor 21 rotates, the fan 31 runs along with it.
  • the airflow enters from the air inlet, flows through the motor 21 and other components, and finally flows out from the air outlet, thereby achieving the effect of cooling the motor 21 and other components in the casing 10 .
  • the airflow can also effectively blow the dust on the bottom plate 41 to the dust outlet, and finally enter the dust collecting box (not shown in the figure), so as to achieve the effect of dust collection.
  • the fan 31 further includes a bracket 311 , an air guide part 312 and a dust suction part 313 .
  • the bracket 311 has a substantially annular structure, and the bracket 311 includes an upper surface 321 , a lower surface 331 and a through hole 341 which are disposed opposite to each other.
  • the upper surface 321 is disposed on the side away from the bottom plate 41 with respect to the lower surface 331 .
  • the bracket 311 is fixedly connected with the motor shaft 211 , that is, the through hole 341 of the bracket 311 is sleeved on the outer ring of the motor shaft 211 .
  • the fan 31 includes at least two air guides 312 , and the air guides 312 are distributed on the upper surface 321 of the bracket 311 .
  • the bracket 311 is annular, that is, the bracket 311 is basically symmetrically arranged along the motor axis 101 , the air guide portions 312 are evenly distributed on the upper surface 321 of the bracket 311 along the circumferential direction of the motor axis 101 , and the air guide portion 312 extends upward along the direction of the motor axis 101 .
  • the air guide portion 312 is specifically an arc-shaped fan heat blade, wherein the number of fan heat blades on the fan 31 is greater than or equal to 20, so that when the fan 31 rotates, the generated air volume is larger, so as to make the fan 31 rotate. The fan heat effect of the fan 31 is better.
  • the arc length of the fan heating blade is greater than 13 mm, so that when the fan 31 is rotating, the air volume is larger, thereby improving the fan heating effect of the fan 31 .
  • the fan 31 includes at least two dust suction parts 313, and the dust suction parts 313 are distributed on the lower surface 331 of the bracket 311, that is, the dust suction parts 313 and the air guide parts 312 are arranged on both sides of the bracket 311 opposite to each other. 313 is disposed adjacent to the bottom plate 41 .
  • the dust collecting part 313 and the bracket 311 are integrally formed, of course, they can also be formed separately.
  • the dust collecting parts 313 are evenly distributed on the lower surface 331 of the bracket 311 along the circumferential direction of the motor axis 101 , and the dust collecting parts 313 extend downward along the direction of the motor axis 101 .
  • the dust suction portion 313 is specifically an arc-shaped dust suction blade.

Abstract

一种砂光机（100），包括：机壳（10）；电机（21），至少部分设置于机壳（10）内，用于提供动力来源，电机（21）包括绕电机轴线转动的电机轴（211）；风扇组件（30），包括与电机连接的风扇（31）；偏心元件（50），由电机（21）驱动，偏心元件（50）具有一个与电机轴线（101）偏离设置的中心轴线（102）；底板组件（40），包括底板（41）、固定于底板（41）下表面（412）上的打磨件以及用于支撑偏心元件（50）的支承件（42），支承件（42）包括相对设置的第一端面（421）和第二端面（422），第二端面（422）相对于第一端面（421）设置在靠近下表面（412）的一侧；砂光机（100）还包括平衡块（61），与偏心元件（50）连接由电机驱动围绕中心轴线（102）旋转；平衡块（61）的质心至底板下表面（412）的距离与支承件第一端面（421）至底板下表面（412）距离的比值大于等于0.2且小于等于0.4。风扇的重量与所述风扇外径的平方的乘积大于等于40kg/cm 2小于等于200kg/cm 2。

Description

砂光机
本申请要求在2020年11月19日提交中国专利局、申请号为202011298291.9的中国专利申请的优先权，该申请的全部内容通过引用结合在本申请中。
技术领域
本申请涉及一种电动工具，例如涉及一种砂光机。
背景技术
砂光机作为一种打磨抛光类工具越来越受到人们的欢迎。从功能上，其主要用于机械、建筑装修、家具油漆等表面的清理、去毛、磨光等；从结构上，其通常包括：机壳、电机、风扇组件、偏心元件、底板组件等。机壳用于容纳电机、风扇组件和偏心元件，底板组件至少部分置于机壳外，底板组件上用来连接砂纸。偏心元件驱动底板组件以电机的电机轴线运动，从而实现砂纸对待磨件的打磨和抛光，风扇组件用于在电机运行时，产生集尘气流和扇热气流。
砂光机为了减小机器运行时，产生的震动，往往会设置平衡结构，用来平衡底板组件，在设置平衡结构时，为了便于安装、简化结构，会直接将平衡结构与偏心元件和/或风扇组件固定连接或者一体成型，但是这样设置往往会使平衡结构的质心偏高，进而平衡结构的质心至底板组件的质心之间的距离增大，增加了质心之间的扭矩，为了平衡扭矩，则需增加额外的配重来平衡扭矩，保证机器运行的平稳，如此会使增大砂光机的重量，影响砂光机的操作手感。
发明内容
本申请提供一种轻便的砂光机。
本申请采用如下的技术方案：一种砂光机，包括：机壳；电机，至少部分设置于机壳内，用于提供动力来源，电机包括绕电机轴线转动的电机轴；风扇组件，包括与电机连接的风扇；偏心元件，由电机驱动，偏心元件具有一个与电机轴线分离设置的中心轴线；底板组件，包括底板以及用于支撑偏心元件的支承件，支承件包括相对设置的第一端面和第二端面，第二端面相对于第一端面靠近下表面；砂光机还包括平衡块，与偏心元件连接并由电机驱动围绕中心轴线旋转；平衡块的质心至底板下表面的距离与支承件的第一端面至底板下表面距离的比值大于等于0.2且小于等于0.4。
平衡块包括：本体，本体与偏心元件连接；质心调节部，质心调节部用于调节平衡块的质心；其中，质心调节部与本体固定连接或者一体成型。
底板组件还包括安装支承件的支承座，支承座与底板固定连接，支承座包括允许平衡块转动的避让槽。
底板包括允许平衡块运动的凹槽，平衡块与底板在其轴向上至少部分重叠。
凹槽为圆形凹槽，且凹槽的圆心位于中心轴线上，凹槽的内径与底板外径的比值大于等于0.25且小于等于0.4。
平衡块包括增重部和减重部，减重部设置于平衡块朝向底板的一侧，增重部设置于平衡块朝向风扇的一侧；
平衡块包括增重部和减重部，减重部设置于平衡块朝向风扇的一侧，增重部设置于平衡块朝向底板的一侧。
风扇的重量与风扇外径的平方的乘积大于等于40kg/cm 2小于等于200kg/cm 2。
风扇重量与电机的质量的比值大于等于3％且小于等于25％。
还提供一种砂光机，包括：机壳；电机，至少部分设置于机壳内，用于提供动力来源，电机包括绕电机轴线转动的电机轴；风扇组件，包括与电机连接的风扇；偏心元件，由电机驱动，偏心元件具有一个与电机轴线偏离设置的中心轴线；底板组件，包括底板、固定于底板下表面上的打磨件以及用于支撑偏心元件的支承件，支承件包括相对设置的第一端面和第二端面，第二端面相对于第一端面设置在靠近下表面的一侧；砂光机还包括平衡块，与偏心元件连接由电机驱动围绕中心轴线旋转；平衡块的质心至底板下表面的距离与支承件第一端面至底板下表面距离的比值大于等于0.2且小于等于0.4；风扇的重量与风扇外径的平方的乘积大于等于40kg/cm 2小于等于200kg/cm 2。
风扇在沿电机轴线的方向上位于平衡块的上侧，其中风扇的密度小于6.5g/cm 3。
底板包括允许平衡块运动的凹槽，平衡块与底板在其轴向上至少部分重叠。
凹槽为与中心轴线同轴的圆形凹槽，凹槽内径与底板外径的比值大于等于0.25且小于等于0.4。
风扇重量与电机的质量的比值大于等于3％且小于等于25％。
平衡块包括增重部和减重部，减重部设置于平衡块朝向底板的一侧，增重部设置于平衡块朝向风扇的一侧；
平衡块包括增重部和减重部，减重部设置于平衡块朝向风扇的一侧，增重部设置于平衡块朝向底板的一侧。
本申请通过将平衡块的质心邻近底板的下底面设置，减少平衡块质心与底板组件质心的两者之间的扭矩，从而减小了平衡块的重量，减轻了砂光机的重量。
附图说明
图1是本申请所示砂光机的立体图；
图2为图1所示砂光机的动力组件、风扇组件和底板组件的结构平面图；
图3为图2所示的结构沿电机轴线的剖视图；
图4为图2所示结构的爆炸图；
图5为图2所示结构的另一视角的爆炸图；
图6为图4所示结构中风扇的立体图；
图7为图4所示结构中风扇的另一视角的立体图；
图8为图4所示结构中平衡块的立体图；
图9为图4所示结构中平衡块的另一视角的立体图。
具体实施方式
图1所示为砂光机100，其可以驱动功能元件运动，该功能元件可以为砂纸，这样砂光机100就可以通过功能元件对各种材料的工件表面进行砂磨、光整等。
可以理解的，该砂光机100具体可以为圆砂、三角砂、方砂的等。为了清楚的描述本申请的技术方案，本申请具体以圆砂为例。
为了方便说明，定义如图1所示的上、下、前、后、左和右。
如图1至图5所示，砂光机100包括：机壳10、开关111、底板组件40、动力组件20、风扇组件30、偏心元件50和能量源(图中未示出)。
其中，机壳10作为砂光机100的外形部分，机壳10至少形成有把手部110、容纳部120和支架部130。把手部110用于供用户握持，把手部110一端与容纳部120连接，另一端可以用于连接外部电源线缆，也可以是形成连接座用于安装电池包之类的便携式直流电源。容纳部120位于把手部110和支架部130之间，容纳部120内部形成容纳腔，动力组件20至少部分设置容纳腔内。支架部130用于覆盖风扇组件30和至少部分底板组件40。
开关111可以安装在机壳10上，具体的，开关111安装在把手部110上，这样设置，当用户握持在把手部110时，能够相对方便的触发开关111。
动力组件20包括电机21，电机21作为砂光机100的原动机，设置在机壳10内。电机21包括用于将动力传递至风扇组件30的电机轴211，电机轴211绕电机轴线101转动。其中 电机轴线101基本沿上下方向延伸。
风扇组件30包括风扇31，风扇31能被电机轴211驱动从而绕电机轴线101转动，风扇31被电机轴211驱动从而转动时，风扇31能够产生气流。
偏心元件50围绕电机轴211，且偏心元件50相对电机轴211偏心设置。偏心元件50安装至电机轴211上并与电机轴211固定连接。其中需要说明的是，偏心元件50与电机轴211偏心设置指的是，偏心元件50具有一个中心轴线102，中心轴线102与电机轴211的电机轴线101相互平行且两者之间还存在一个距离D。距离D的存在使得当电机轴211转动时，偏心元件50能够将电机轴211的自转传递成与偏心元件50连接的其他零部件的自转和公转。
电机轴211能够驱动底板组件40，从而使底板组件40能够相对于机壳10摆动。具体的，底板组件40与偏心元件50固定连接，也就是说电机轴211通过偏心元件50将动力传递至底板组件40。底板组件40包括底板41，底板41包括相对设置的上表面411和下表面412，下表面412相对于上表面411设置在远离偏心元件50的一侧，其中下表面412用于安装砂纸等功能元件。在电机轴211与偏心元件50的驱动下，底板41能够做偏心运动。当底板41做偏心运动时，砂纸能够在待磨工件的表面上不断的摩擦，从而实现对待磨工件的打磨、抛光等功能。
能量源用于给砂光机100提供能量来源，能量源可以是交流电，也可以是直流电，如电池包等便携式移动电源。在本实施例中，能量源采用的是交流电。
如图4至图5所示，底板组件40还包括支承件42和支承座43。支承件42用于减小电机轴211与和设置于电机轴211上的偏心元件50转动时的摩擦系数，保证电机轴211的回转精度和平行度。支承件42套设在偏心元件50上，并与偏心元件50固定连接。具体的，支承件42为滚动轴承，滚动轴承42包括外圈、内圈和滚珠。其中内圈套设在电机轴211上，并与电机轴211固定连接。外圈与支承座43固定连接，并围绕内圈设置。滚珠设置在外圈与内圈之间，用于使外圈能够相对内圈运动。
支承座43用于安装支承件42。支承座43与支承件42外圈固定连接，即支承件42外圈与支承座43构成同步连接。支承座43与底板41固定连接，也就是说底板41能够与支承座43和支承件42的外圈构成同步运动。
如图4、图5、图8和图9所示，砂光机100还包括平衡组件60，用于平衡底板组件40。平衡组件60包括平衡块61，在沿电机轴线101的方向上，平衡块61位于在风扇31与底板41之间，平衡块61与偏心元件50为可拆卸的固定连接，也就是说偏心元件50与平衡块61构成同步运动，且平衡块61能够随偏心元件50绕中心轴线102转动。需要说明的是，平衡 块61与偏心元件50为可拆卸的固定连接指的是，平衡块61与偏心元件50为两个可分离的零部件，两者之间可以采用螺钉连接、螺纹连接或者是卡扣连接等连接方式固定在一起，以使两者之间能够构成同步转动。在本申请中，平衡块61与偏心元件50采用螺钉连接，具体的，平衡组件60至少包括一个固定件，固定件具体为定位螺钉，定位螺钉穿过平衡块61上的连接孔，使平衡块61抵接至支承件42的内圈，最后将平衡块61锁定至偏心元件50上，从而实现平衡块61与偏心元件50的同步转动，也可以理解为固定件从平衡块61靠近底板41的一侧穿入平衡块61的连接孔，从而与偏心元件50固定，即构成同步转动。通过采用平衡块61来支撑支承件42的内圈，也就是说可以不用设置额外的定位挡圈，就能防止砂光机100在运行的过程中，支承件42的内圈出现脱离支承件42外圈的情况，简化了结构的同时又使整机结构更加紧凑。
在本实施中，支承件42还包括相对设置的第一端面421和第二端面422，第二端面422相对于第一端面421设置在靠近底板41下表面412的一侧。也就是说，在沿电机轴线101的方向上，第一端面421设置在第二端面422的上侧。其中，平衡块61的质心A至底板41下表面412的距离H1占支承件42的第一端面421至底板41下表面412的距离H2的比值大于等于0.2且小于等于0.4。平衡块61的质心A邻近底板41设置，将平衡块61的质心A位置设置在上述范围内，以使平衡块61的质心A靠近底板组件40的质心B设置，这样可以减少平衡块61的质心A与底板组件40的质心B之间的间距，从而可以大大的减少平衡块61的重量，进而减小砂光机100整机的重量。
如图3所示，平衡块61的质心A位于底板41和支承件42之间，其中，在沿电机轴线101的方向上，平衡块61的质心A至底板组件40的质心B的距离D1大于等于0mm且小于等于2mm。平衡块61用于实现底板组件40质量平衡和扭矩平衡的双重平衡，通过上述设置，使平衡块61的质心A临近底板组件40的质心B，减小了平衡块61的质心A至底板组件40质心B的距离，减小了两者之间的扭矩，即平衡块61就可以减少了用来平衡扭矩的重量。我们也可以理解为不需要设置其他的重量块来平衡扭矩，这样我们就可以避免为了配平其他的重量块，而在平衡块61上增加重量以用来配平其他重量块的情况。或者说只需要配置其他很轻的重量块就可以抵消扭矩，这样也只需要在平衡块61上格外配置与其他重量块重量一致的格外重量块即可，由此我们可知，通过上述设置，可以使平衡块61的重量能够大幅度的减小，进而减小了砂光机100的重量，方便用户操作，减轻了整机的重量，减少用户的疲劳感。平衡块61的质心A至底板组件40的质心B的距离D1大于等于0mm小于等于1mm，在上述范围内，效果更好。
平衡块61还包括本体63、质心调节部62。本体63与偏心元件连接。质心调节部62用于调节平衡块61的质心，质心调节部62与本体63固定连接或者一体成型。在本实施例中，质心调节部62与本体63一体成型。具体的，质心调节部62包括增重部和减重部，增重部用于增加平衡块61的重量，减重部用于减小平衡块61的重量。减重部设置于平衡块61朝向底板41的一侧，增重部设置于平衡块61朝向风扇31的一侧。当然作为另一种实施方式，减重部设置于平衡块61朝向风扇31的一侧，增重部设置于平衡块61朝向底板41的一侧。上述设置，即在平衡块61上设置一个质心调节部62，可以根据底板组件40的重量、偏心距等不同，通过对增重部、减重部做出相应的调整，以此来调节质心的位置，从而实现对底板组件40的重量与扭矩的平衡。例如设置向上延伸的用来增加平衡块61重量的质心调节部62，也可以是向下延伸的用来减轻平衡块61重量的质心调节部62。
如图3至图5所示，平衡块61位于支承座43和底板41之间，且平衡块61至少部分设置在底板41内。平衡块61包括有相对设置的第一表面611和第二表面612，第一表面611相对于第二表面612远离底板41设置，第二表面612在沿电机轴线101的方向上位于固定件的下侧。也就是说，第一表面611至少部分与支承件42内圈抵接，第二表面612邻近底板41的上表面411设置。其中，底板41的上表面411向下凹陷形成有可供平衡块61活动的凹槽413，平衡块61的第二表面612朝向凹槽413凹陷方向延伸，也可以说是，平衡块61与底板41在其轴向上部分重叠。在本实施例中，凹槽413为与中心轴线102同轴的圆形凹槽，凹槽413的内径占底板41的外径的比值大于等于0.25且小于等于0.4。凹槽413为的半径C大于等于16mm小于等于50mm，一方面，通过将凹槽413的半径C设置在上述合理范围内，既能保证平衡块61具有足够的活动空间，同时又避免凹槽413的半径过大，增加了传动组件在径向上的尺寸的情况。另一方面，通过在在底板41上设置向下凹陷的凹槽413，使平衡块61尽可能的临近底板41设置，从而使平衡块61的质心A更加靠近底板41，在缩短扭矩的同时还能缩短整机在上下方向上尺寸，进而不但使整机结构更加紧凑，还能减轻整机的重量。
平衡块61至少部分设置在支承座43内，支承座43形成有避让槽431和容纳槽432，在垂直于电机轴线101的径向上，避让槽431位于容纳槽432的外侧，避让槽431与容纳槽432由支承座43靠近底板41上表面411的端面向上凹陷形成。容纳槽432用于容纳支承件42，其中容纳槽432的壁面至少部分与支承件42的外圈接触。其中，避让槽431与支承件42在轴向上部分重叠。避让槽431用于供平衡块61活动，其中，避让槽431的半径E大于等于20mm，通过这样设置，在保证平衡块61具有足够的活动空间的情况下，又能使整机结构在上下方向上更加紧凑，从而给用户提供一个结构小巧、又轻便的砂光机100。
第二表面612第一表面611第一表面611偏心元件50与风扇31固定连接或者一体成型。在本实施例中，偏心元件50与风扇31一体成型，即风扇31上形成有偏心元件50。风扇31安装在电机轴211上，并能被电机轴211驱动从而转动。当然也可以说，风扇31就是偏心元件50。
风扇31的重量与电机21的重量的比值大于等于3％且小于等于25％。在电机21的重量一定的情况下，风扇31重量占电机21重量越小，意味着风扇31的重量越轻，即风扇31在转动时产生的转动惯量越小，进而能大大提高用户的操作感。另一方面，风扇31的重量越轻，即减轻了砂光机100整机的重量，进而便于用户握持。
在本实施例中，风扇31采用密度小于6.5g/cm 3的材料，因重量与密度成正比，即密度越小，风扇31的重量也越小，即有效的减轻了风扇31的重量，从而减小砂光机100的重量。示例性的，风扇31采用密度大于等于1g/cm 3且小于等于3g/cm 3的材料时，在满足结构强度的同时，又能减轻风扇31的重量。可以采用铝材料制成的风扇31，在减轻风扇31重量的同时，又能节省成本。当砂光机100如图1放置时，电机21驱动风扇31转动时，风扇31会产生转动惯量，也就是数说使风扇31转动时会形成使风扇31保持绕电机轴线101(也就是上下方向)转动的约束力，该约束力会在砂光机100有沿与上下方向倾斜相交的某一方向运动的趋势时约束砂光机100使其继续绕上下方向转动，也就是说用户对将砂光机100施加一个使砂光机100沿与上下方向倾斜相交的某一方向运动的力时，约束力会使砂光机100有沿砂光机100运动方向相反运动的趋势，这样就需要用户施加更多的力，以克服该约束力，从而造成操作不便，而且长时间这样操作，会使用户很容易产生疲劳感，影响工作效率。转动惯量与重量成正比，当风扇31的重量越大时，转动惯量越大，对用户产生的影响也越大，因此通过上述设置，能够减小转动惯量，从而提高用户的体验感。
风扇31的重量与外径的平方的乘积的比值范围大于等于40kg/cm 2小于等于200kg/cm 2。其中外径指的是风扇31的外边缘的半径。通过将风扇31的重量与外径的平方的乘积的比值设置在上述范围内，则能有效的减小风扇31在转动时产生的转动惯量，减小用户操作时约束力的影响，进而提高工作效率。
风扇31的重量与电机21重量的总重量小于等于400g。砂光机100内部结构中，电机21、风扇31的重量相对于其他零部件的重量而言是比较重的，也就是说砂光机100的重量主要集中于电机21和风扇31。通过对平衡组件60与风扇组件30的结构以及位置的设置，使得风扇31的重量大大的降低，从而获得一个转动惯量较小的、重量较轻的砂光机100。在本实施例中，风扇31的重量小于等于80g。
如图1所示，机壳10上形成有进风口、出风口和出尘口。风扇31固定连接至电机轴211，即电机21转动时，风扇31随之运行。当风扇31转动时，气流从进风口进入，流经电机21与其他零部件，最终从出风口流出，从而达到对电机21与机壳10内其他零部件进行散热的效果。另一方面，气流还能有效的将底板41上的尘屑吹至出尘口，最终进入集尘盒(图中未示出)，从而集尘的效果。
如图6至图7所示，风扇31还包括支架311、导风部312和吸尘部313。支架311大致呈环形结构，支架311包括有相对设置的上表面321、下表面331和贯穿孔341。上表面321相对于下表面331设置在远离底板41的一侧。支架311与电机轴211固定连接，即支架311的贯穿孔341套设在电机轴211的外圈上。当然，在支架311的贯穿孔341与电机轴211的外圈之间还可以设有中间件，在此并不限制支架311贯穿孔341与电机轴211外圈之间的具体连接方式，只要能够实现同步转动即可。风扇31上包括有至少两个的导风部312，导风部312分布在支架311的上表面321，导风部312与支架311一体成型，当然也可以分别成型。支架311呈环形，即支架311相对沿电机轴线101基本对称设置，导风部312沿电机轴线101的圆周方向均匀分布在支架311的上表面321，导风部312沿电机轴线101方向向上延伸。在本实施例中，导风部312具体为弧形的扇热叶片，其中，风扇31上的扇热叶片数大于等于20片，使风扇31在转动时，产生的风量越大，以此使风扇31的扇热效果更好。扇热叶片的弧长大于13mm，进而使风扇31在转动时，风量越大，从而提高风扇31的扇热效果。风扇31上包括有至少两个的吸尘部313，吸尘部313分布在支架311的下表面331，即吸尘部313与导风部312相对设置在支架311的两侧，其中吸尘部313邻近底板41设置。吸尘部313与支架311一体成型，当然也可以分别成型。吸尘部313沿电机轴线101的圆周方向均匀分布在支架311的下表面331，吸尘部313沿电机轴线101方向向下延伸。在本实施例中，吸尘部313具体为弧形的吸尘叶片。

Claims (16)

  1. 一种砂光机，包括：
    机壳；
    电机，至少部分设置于所述机壳内，用于提供动力来源，所述电机包括绕电机轴线转动的电机轴；
    风扇组件，包括与所述电机连接的风扇；
    偏心元件，由所述电机驱动，所述偏心元件具有一个与所述电机轴线分离设置的中心轴线；
    底板组件，包括底板以及用于支撑所述偏心元件的支承件，所述支承件包括相对设置的第一端面和第二端面，所述第二端面相对于所述第一端面靠近所述下表面；
    其中：
    所述砂光机还包括平衡块，与所述偏心元件连接并由所述电机驱动围绕所述中心轴线旋转；
    所述平衡块的质心至所述底板下表面的距离与所述支承件的第一端面至所述底板下表面距离的比值大于等于0.2且小于等于0.4。
  2. 根据权利要求1所述的砂光机，其中：
    所述平衡块包括：本体，所述本体与所述偏心元件连接；
    质心调节部，所述质心调节部用于调节所述平衡块的质心；
    其中，所述质心调节部与所述本体固定连接或者一体成型。
  3. 根据权利要求2所述的砂光机，其中：
    所述底板组件还包括安装所述支承件的支承座，所述支承座与所述底板固定连接，所述支承座包括允许所述平衡块转动的避让槽。
  4. 根据权利要求2所述的砂光机，其中：
    所述底板包括允许所述平衡块运动的凹槽，所述平衡块与所述底板在其轴向上至少部分重叠。
  5. 根据权利要求4所述的砂光机，其中：
    所述凹槽为圆形凹槽，且所述凹槽的圆心位于所述中心轴线上，所述凹槽的内径与所述底板外径的比值大于等于0.25且小于等于0.4。
  6. 根据权利要求1所述的砂光机，其中：
    所述平衡块包括增重部和减重部，所述减重部设置于所述平衡块朝向所述底板的一侧，所述增重部设置于所述平衡块朝向所述风扇的一侧；
  7. 根据权利要求1所述的砂光机，其中：
    所述平衡块包括增重部和减重部，所述减重部设置于所述平衡块朝向所述风扇的一侧，所述增重部设置于所述平衡块朝向所述底板的一侧。
  8. 根据权利要求4所述的砂光机，其中：
    所述风扇的重量与所述风扇外径的平方的乘积大于等于40kg/cm 2小于等于200kg/cm 2。
  9. 根据权利要求1所述的砂光机，其中：
    所述风扇重量与所述电机的质量的比值大于等于3％且小于等于25％。
  10. 一种砂光机，包括：
    机壳；
    电机，至少部分设置于所述机壳内，用于提供动力来源，所述电机包括绕电机轴线转动的电机轴；
    风扇组件，包括与所述电机连接的风扇；
    偏心元件，由所述电机驱动，所述偏心元件具有一个与所述电机轴线偏离设置的中心轴线；
    底板组件，包括底板、固定于所述底板下表面上的打磨件以及用于支撑所述偏心元件的支承件，所述支承件包括相对设置的第一端面和第二端面，所述第二端面相对于所述第一端面设置在靠近所述下表面的一侧；
    其中：
    所述砂光机还包括平衡块，与所述偏心元件连接由所述电机驱动围绕所述中心轴线旋转；
    所述平衡块的质心至所述底板下表面的距离与所述支承件第一端面至所述底板下表面距离的比值大于等于0.2且小于等于0.4；所述风扇的重量与所述风扇外径的平方的乘积大于等于40kg/cm 2小于等于200kg/cm 2。
  11. 根据权利要求10所述的砂光机，其中：
    所述风扇在沿所述电机轴线的方向上位于所述平衡块的上侧，其中所述风扇的密度小于6.5g/cm 3。
  12. 根据权利要求10所述的砂光机，其中：
    所述底板包括允许所述平衡块运动的凹槽，所述平衡块与所述底板在其轴向上至少部分重叠。
  13. 根据权利要求12所述的砂光机，其中：
    所述凹槽为圆形凹槽，且所述凹槽的圆心位于所述中心轴线上，所述凹槽内径与所述底 板外径的比值大于等于0.25且小于等于0.4。
  14. 根据权利要求10所述的砂光机，其中：
    所述风扇重量与所述电机的质量的比值大于等于3％且小于等于25％。
  15. 根据权利要求10所述的砂光机，其中：
    所述平衡块包括增重部和减重部，所述减重部设置于所述平衡块朝向所述底板的一侧，所述增重部设置于所述平衡块朝向风扇的一侧；
  16. 根据权利要求10所述的砂光机，其中：
    所述平衡块包括增重部和减重部，所述减重部设置于所述平衡块朝向风扇的一侧，所述增重部设置于所述平衡块朝向所述底板的一侧。
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