CN114515989A - Mode switching mechanism of electric polishing tool and dual-mode eccentric polishing machine - Google Patents
Mode switching mechanism of electric polishing tool and dual-mode eccentric polishing machine Download PDFInfo
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- CN114515989A CN114515989A CN202210241560.0A CN202210241560A CN114515989A CN 114515989 A CN114515989 A CN 114515989A CN 202210241560 A CN202210241560 A CN 202210241560A CN 114515989 A CN114515989 A CN 114515989A
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- 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
- B24B29/00—Machines or devices for polishing surfaces on work by means of tools made of soft or flexible material with or without the application of solid or liquid polishing agents
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- 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
- B24B41/005—Feeding or manipulating devices specially adapted to grinding machines
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- 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
- B24B41/02—Frames; Beds; Carriages
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- 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
- B24B47/02—Drives or gearings; Equipment therefor for performing a reciprocating movement of carriages or work- tables
- B24B47/04—Drives or gearings; Equipment therefor for performing a reciprocating movement of carriages or work- tables by mechanical gearing only
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Structure Of Transmissions (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
The invention discloses a mode switching mechanism of an electric polishing tool and a dual-mode eccentric polishing machine, and belongs to the field of electric tools. The mode switching mechanism comprises a gear speed change mechanism, a latch rod, an eccentric shaft and an eccentric output piece, wherein the eccentric output piece is provided with a plurality of latch grooves, the latch rod is provided with two working modes of being separated from or jointed with the latch grooves, and when the gear speed change mechanism is in a high-speed output mode, the latch rod is separated from the latch grooves, so that the eccentric output piece revolves around a second rotation axis and freely rotates around a third rotation axis; when the gear change mechanism is in the low speed output mode, the latch lever engages the latch slot to cause the eccentric output member to revolve about the second rotational axis. The invention improves the flexibility of selecting the working mode of the electric polishing tool, can conveniently realize the output of the optimal transmission ratio, is beneficial to improving the working performance of the eccentric polishing machine, and has the advantages of simple structure, convenient processing and manufacturing, stable transmission, flexible and convenient mode switching operation and the like.
Description
Technical Field
The invention relates to an electric grinding and polishing tool, in particular to a mode switching mechanism of an electric polishing tool and a dual-mode eccentric polishing machine.
Background
The electric grinding and polishing tool is a common electric tool, is a mechanical device for finishing the grinding and sanding of the surface of a material, and can be used for the surface grinding operation of wooden products, metal products, plastic products, walls and the like.
The existing electric eccentric grinding and polishing tool adopts a motor to drive an eccentric shaft to move, and the eccentric shaft is utilized to drive a grinding and polishing bottom plate to move. In operation, the eccentric shaft rotates about the drive shaft of the motor (first axis of rotation), and a second axis of rotation on the eccentric shaft, parallel to the first axis of rotation, also moves rotationally about the first axis of rotation. Thus, the grinding and polishing base plate rotates around the second rotation axis and revolves around the first rotation axis, and random orbital motion is formed. Such eccentric electric grinding and polishing tools are therefore also referred to as random orbital grinders or polishers.
According to different use conditions and operation expectations of users, the eccentric polishing machine also has two working modes of high speed and low speed, in the high speed mode, the grinding and polishing bottom plate is required to revolve around a first rotation axis and rotate freely around a second rotation axis, so that the grinding and polishing bottom plate rotates at high speed and the use safety is ensured; in the low-speed mode, the grinding and polishing base plate is required to revolve around the first rotation axis and forcibly rotate around the second rotation axis, which ensures that the grinding and polishing base plate has a large output torque in a low-speed rotation state. For example, a "polisher" disclosed in chinese patent No. ZL201621126145.7, the mode selection transmission mechanism of which comprises an internal gear member, a cylindrical gear member and a mode switching knob with a joint pin, wherein the periphery of the internal gear member is provided with a joint groove adapted to the joint pin, and in a low speed mode, the joint pin is engaged into the joint groove of the internal gear member to fix the internal gear member, and at this time, the cylindrical gear member is forced to rotate in the internal gear member, so that the grinding and polishing bottom plate and the cylindrical gear member rotate together and revolve around a first rotation axis; in the high-speed mode, the engaging pins are disengaged from the engaging grooves of the internal gear member, and the internal gear member can be freely rotated, and the grinding/polishing base plate can be freely rotated about the second rotation axis while revolving about the first rotation axis. The mode selection transmission mechanism in the above patent application has the advantages of simple and compact structure, etc., but the low-speed mode is realized by utilizing the cylindrical gear part to rotate in the inner gear part, namely the cylindrical gear part and the inner gear part need to be always kept in a meshed state, and the reasonable eccentric distance range of grinding and polishing bottom plates needs to be considered when the low-speed transmission ratio is changed, so that the design of the low-speed transmission ratio has certain limitation.
Disclosure of Invention
1. Technical problems to be solved by the invention
The invention aims to provide a mode switching mechanism of an electric polishing tool and a dual-mode eccentric polishing machine, which aim to solve the problems that the existing electric polishing tool is lack of working mode adjustment and the existing mode selection transmission mechanism has design limitation and the like; in addition, the transmission ratio design of the gear speed change mechanism is not limited by the eccentricity, so that the optimal transmission ratio output is convenient to realize, the working performance of the eccentric polishing machine is improved, and the gear speed change mechanism has the advantages of simple structure, convenience in processing and manufacturing, stable transmission, flexibility and convenience in mode switching operation and the like.
2. Technical scheme
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
the invention discloses a mode switching mechanism of an electric polishing tool, which comprises a gear speed change mechanism, a latch rod, an eccentric shaft and an eccentric output part, wherein the eccentric shaft is provided with a second rotating axis and a third rotating axis which are parallel, the output end of the gear speed change mechanism is in transmission connection with the eccentric shaft and is used for driving the eccentric shaft to rotate around the second rotating axis, the eccentric output part is in rotating connection with the eccentric shaft by taking the third rotating axis as a rotating axis, the eccentric output part is provided with a plurality of latch grooves, and the latch rod has two working modes of being separated from or combined with the latch grooves along with the speed change switching action of the gear speed change mechanism;
when the gear speed change mechanism is in a high-speed output mode, the bolt rod is separated from the bolt groove, so that the eccentric output piece revolves around the second rotation axis and freely rotates around the third rotation axis;
when the gear shifting mechanism is in a low-speed output mode, the latch rod is engaged with the latch groove to enable the eccentric output piece to revolve around the second rotation axis.
Furthermore, the gear speed change mechanism comprises a transmission shell, an intermediate transmission shaft, a first-stage transmission gear, a second-stage transmission gear, an output shaft, a first-stage driven gear and a second-stage driven gear, wherein the intermediate transmission shaft is arranged in the transmission shell by taking a first rotation axis as a rotation axis, the output shaft is arranged in the transmission shell by taking a second rotation axis as a rotation axis, the first rotation axis is parallel to the second rotation axis, the first-stage transmission gear and the second-stage transmission gear are axially arranged on the intermediate transmission shaft up and down, and the first-stage driven gear and the second-stage driven gear are fixedly connected and axially and vertically slidably arranged on the output shaft; the first-stage driven gear and the second-stage driven gear are driven by the mode selection mechanism to axially move up and down on the output shaft, wherein:
When the mode selection mechanism is in a high-speed output mode, the primary transmission gear is meshed with the primary driven gear, and the secondary transmission gear is separated from the secondary driven gear;
when the mode selection mechanism is in a low-speed output mode, the primary transmission gear is separated from the primary driven gear, and the secondary transmission gear is meshed with the secondary driven gear.
Furthermore, the first-stage transmission gear is axially and vertically slidably mounted on the middle transmission shaft, a first elastic piece is arranged above the first-stage transmission gear, and a second elastic piece is arranged above the first-stage driven gear.
Furthermore, the first elastic member and the second elastic member are compression springs.
Furthermore, the upper end of the bolt rod is mounted on the secondary driven gear, and the lower end of the bolt rod penetrates through a bolt hole in the eccentric shaft to be matched with the bolt groove.
Furthermore, the primary driven gear and the secondary driven gear form a duplicate gear.
Furthermore, the upper end of the middle transmission shaft is supported on the upper part of the transmission shell through a transmission shaft upper bearing, the lower end of the middle transmission shaft is supported on the lower part of the transmission shell through a transmission shaft lower bearing, the upper end of the output shaft is supported on the upper part of the transmission shell through an output shaft upper bearing, the lower end of the output shaft is matched with an eccentric shaft hole, the eccentric shaft is axially and rotatably supported on the lower part of the transmission shell around a second rotation axis through an eccentric shaft bearing, and the eccentric output element is axially and rotatably supported in the eccentric shaft around a third rotation axis through a rotation shaft bearing.
Furthermore, the mode selection mechanism comprises a speed change knob and a shifting fork, wherein the shifting fork is arranged in the transmission shell in a vertical sliding manner through a guide rod and is matched with the primary driven gear or the secondary driven gear to drive the primary driven gear and the secondary driven gear to axially move up and down on the output shaft; the speed change knob on be equipped with eccentric driving lever, one side of shift fork be equipped with horizontal waist type hole, speed change knob axial rotation install on transmission housing, and eccentric driving lever is located horizontal waist type downthehole, speed change knob pass through the shift fork and drive one-level driven gear and second grade driven gear axial and reciprocate.
The invention discloses a dual-mode eccentric polishing machine which comprises a handle, a machine head and a polishing bottom plate, wherein a motor is arranged in the handle, the mode switching mechanism of an electric polishing tool is arranged in the machine head, a motor shaft of the motor is in transmission connection with an input end of a gear speed change mechanism, and the polishing bottom plate is fixedly arranged on an eccentric output piece;
when the gear speed change mechanism is in a high-speed output mode, the motor drives the polishing bottom plate to revolve around the second rotation axis through the gear speed change mechanism and to freely rotate around the third rotation axis;
When the gear speed change mechanism is in a low-speed output mode, the motor drives the polishing bottom plate to revolve around the second rotation axis through the gear speed change mechanism.
Furthermore, the output end of the motor shaft is in transmission connection with the input end of the gear speed change mechanism by adopting a bevel gear set; the dust cover is arranged at the bottom of the machine head, and a dust suction port is formed in the dust cover.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following remarkable effects:
(1) the invention relates to a mode switching mechanism of an electric polishing tool, which comprises a gear speed change mechanism, a latch rod, an eccentric shaft and an eccentric output part, wherein the eccentric output part is provided with a plurality of latch grooves; when the gear speed change mechanism is in a low-speed output mode, the latch rod is engaged with the latch groove to enable the eccentric output member to revolve around the second rotation axis; the gear speed change mechanism is utilized to realize the switching of high and low speed modes of the output rotating speed, and meanwhile, the latch rod moving along with the speed change switching action of the gear speed change mechanism controls the locking state of the eccentric output piece, so that the eccentric output piece can revolve and freely rotate under the high speed output mode and can forcibly revolve and move under the low speed output mode, the eccentric output piece can synchronously change the output mode along with the high and low speed switching of the gear speed change mechanism, and the selection flexibility of the working mode of the electric polishing tool is met; in addition, the transmission ratio design of the gear speed change mechanism is not limited by the eccentricity, so that the optimal transmission ratio output is convenient to realize, the working performance of the eccentric polishing machine is favorably improved, and the gear speed change mechanism has the advantages of simple structure, convenience in processing and manufacturing, stable transmission, flexibility and convenience in mode switching operation and the like;
(2) The invention relates to a mode switching mechanism of an electric polishing tool, wherein a gear speed change mechanism of the mode switching mechanism comprises a transmission shell, an intermediate transmission shaft, a primary transmission gear, a secondary transmission gear, an output shaft, a primary driven gear and a secondary driven gear, wherein the primary driven gear and the secondary driven gear are driven by a mode selection mechanism to axially move up and down on the output shaft; when the mode selection mechanism is in a low-speed output mode, the primary transmission gear is disengaged from the primary driven gear, and the secondary transmission gear is meshed with the secondary driven gear; the two-stage gear speed change mechanism is simple in structure and stable in transmission;
(3) according to the mode switching mechanism of the electric polishing tool, the primary transmission gear is axially and vertically slidably mounted on the intermediate transmission shaft, the first elastic part is arranged above the primary transmission gear, the second elastic part is arranged above the primary driven gear, when the mode selection mechanism is switched to a high-speed output mode, the tooth surfaces of the primary driven gear and the primary transmission gear are not aligned, the primary transmission gear can axially move upwards along with the primary driven gear, the tooth surface position is automatically found when the primary transmission gear rotates, and stable meshing of the primary driven gear and the primary transmission gear is realized; when the mode selection mechanism is switched to a low-speed output mode and the tooth surfaces of the secondary driven gear and the secondary transmission gear are not aligned, the secondary driven gear can elastically abut against the end surface of the secondary transmission gear and automatically aligns the position of the tooth surface when the secondary transmission gear rotates, so that the secondary driven gear and the secondary transmission gear are stably meshed; by adopting the design, the operation of the mode selection mechanism is more convenient, the problems of mode switching operation clamping stagnation, gear beating and the like are effectively avoided, and the mode switching operation convenience, the use stability and the reliability of the electric polishing tool are improved;
(4) According to the mode switching mechanism of the electric polishing tool, the upper end of the bolt rod is mounted on the secondary driven gear, the lower end of the bolt rod penetrates through the bolt hole in the eccentric shaft to be matched with the bolt groove, the bolt rod can be used for transmitting the rotating speed and the torque to the eccentric shaft, and the structural design is simple and compact;
(5) according to the mode switching mechanism of the electric polishing tool, the primary driven gear and the secondary driven gear form the duplicate gear, the gear structure is simple, and the processing and the manufacturing are convenient;
(6) the invention relates to a mode switching mechanism of an electric polishing tool, wherein the upper end of an intermediate transmission shaft is supported on the upper part of a transmission shell through an upper bearing of the transmission shaft, the lower end of the intermediate transmission shaft is supported on the lower part of the transmission shell through a lower bearing of the transmission shaft, the upper end of an output shaft is supported on the upper part of the transmission shell through an upper bearing of the output shaft, the lower end of the output shaft is matched with an axle hole of an eccentric shaft, the eccentric shaft is axially and rotatably supported on the lower part of the transmission shell around a second rotation axis through the eccentric shaft bearing, and an eccentric output part is axially and rotatably supported in the eccentric shaft around a third rotation axis through a self-rotating bearing; by adopting the bearing supporting structure, each rotating part can rotate smoothly and stably, and the transmission of the electric polishing tool is more efficient;
(7) The mode selection mechanism of the electric polishing tool comprises a speed change knob and a shifting fork, wherein the shifting fork is arranged in a transmission shell in a vertical sliding mode through a guide rod and is matched with a primary driven gear or a secondary driven gear;
(8) the invention discloses a dual-mode eccentric polishing machine which comprises a handle, a machine head and a polishing bottom plate, wherein a motor is arranged in the handle, the mode switching mechanism of an electric polishing tool is arranged in the machine head, a motor shaft of the motor is in transmission connection with an input end of a gear speed change mechanism, and the polishing bottom plate is fixedly arranged on an eccentric output part.
Drawings
FIG. 1 is a schematic perspective view of a dual-mode eccentric polishing machine according to the present invention;
FIG. 2 is a schematic perspective view of the dual-mode eccentric polishing machine of the present invention without an auxiliary handle;
FIG. 3 is a schematic longitudinal sectional view of a dual-mode eccentric polisher according to the present disclosure;
fig. 4 is a schematic sectional view showing a mode switching mechanism of an electric polishing tool according to the present invention (low-speed output mode);
fig. 5 is a schematic sectional view showing a mode switching mechanism of an electric polishing tool according to the present invention (a state switched to a high-speed output mode);
fig. 6 is a schematic sectional view (high speed output mode) of a mode switching mechanism of an electric polishing tool according to the present invention;
fig. 7 is a schematic sectional view showing a mode switching mechanism of an electric polishing tool according to the present invention (a state of switching to a low-speed output mode);
FIG. 8 is a perspective view of the internal transmission components of an electric polishing tool mode switching mechanism of the present invention;
FIG. 9 is a schematic disassembled view of the internal transmission components of an electric polishing tool mode switching mechanism of the present invention;
FIG. 10 is a schematic view of the eccentric output member of the electric polishing tool mode switching mechanism according to the present invention;
FIG. 11 is a schematic view showing the mounting of a transmission gear on an intermediate transmission shaft in an electric polishing tool mode switching mechanism according to the present invention;
fig. 12 is a schematic view showing the mounting of a double gear and a latch lever on an output shaft in an electric polishing tool mode switching mechanism of the present invention.
The reference numbers in the schematic drawings illustrate:
1. a handle; 1-1, a handle shell; 1-2, a motor; 1-3, motor shaft; 1-4, motor shaft bearing; 1-5, a first bevel gear; 1-6, a heat radiation fan; 2. a machine head; 2-1, a transmission shell; 2-1-1, a dust cover; 2-1-2, a dust suction port; 2-1-3, handle hole; 2-2, an intermediate transmission shaft; 2-2a, a spline groove of the transmission shaft; 2-2-1, a bearing on the transmission shaft; 2-2-2, a lower bearing of the transmission shaft; 2-3, a second bevel gear; 2-4, a primary transmission gear; 2-4a, internal splines of the transmission gear; 2-5, a first elastic member; 2-6, a secondary transmission gear; 2-7, an output shaft; 2-7a, an output shaft spline groove; 2-7-1, an upper bearing of the output shaft; 2-8, a duplicate gear; 2-8a, a duplicate gear internal spline; 2-8-1, a primary driven gear; 2-8-2, a secondary driven gear; 2-9, a second elastic member; 2-10 parts of a bolt rod; 2-11, an eccentric shaft; 2-11-1, bolt holes; 2-11-2, a balancing weight; 2-12, eccentric shaft bearing; 2-13, an eccentric output member; 2-13-1, end; 2-13-2, a bolt groove; 2-14, a rotation bearing; 3. a mode selection mechanism; 3-1, a speed change knob; 3-1-1, eccentric deflector rod; 3-2, a shifting fork; 3-2-1, horizontal waist-shaped holes; 3-3, a guide rod; 4. polishing the bottom plate; 5. an auxiliary handle; z1, a first axis of rotation; z2, second axis of rotation; z3, third axis of rotation.
Detailed Description
For a further understanding of the present invention, reference is made to the following detailed description taken in conjunction with the accompanying drawings and examples.
[ example 1]
Referring to fig. 4 to 7, the electric polishing tool mode switching mechanism of the present embodiment includes a gear shifting mechanism, a latch lever 2-10, an eccentric shaft 2-11 and an eccentric output member 2-13, wherein the eccentric shaft 2-11 has a second rotation axis z2 and a third rotation axis z3 which are parallel to each other, a certain eccentricity is provided between the second rotation axis z2 and the third rotation axis z3, an output end of the gear shifting mechanism is drivingly connected to the eccentric shaft 2-11 for rotating the eccentric shaft 2-11 around the second rotation axis z2, and the eccentric output member 2-13 is rotatably connected to the eccentric shaft 2-11 around the third rotation axis z3, such that the eccentric output member 2-13 can revolve around the second rotation axis z2 and can also rotate around the third rotation axis z 3. The eccentric output part 2-13 is provided with a plurality of bolt grooves 2-13-2, the bolt rod 2-10 can move up and down along with the variable speed switching action of the gear speed change mechanism, so that the bolt rod 2-10 has two working modes of being separated from or combined with the bolt grooves 2-13-2 along with the variable speed switching action of the gear speed change mechanism, namely a high-speed output mode and a low-speed output mode:
When the gear shifting mechanism is in the high-speed output mode, the latch rod 2-10 is disengaged from the latch slot 2-13-2 (as shown in fig. 6), and at this time, the gear shifting mechanism drives the eccentric shaft 2-11 to rotate at a high speed, the eccentric shaft 2-11 rotates at a high speed to drive the eccentric output member 2-13 to rotate together around the second rotation axis z2 at a high speed, so as to form a high-speed output, and the eccentric output member 2-13 can rotate freely around the third rotation axis z3 relative to the eccentric shaft 2-11, so that the eccentric output member 2-13 can revolve around the second rotation axis z2 and rotate freely around the third rotation axis z3, so as to form a random orbital motion.
When the gear shifting mechanism is in a low-speed output mode, the latch rod 2-10 is engaged with the latch slot 2-13-2 (as shown in fig. 4), and at this time, the gear shifting mechanism drives the eccentric shaft 2-11 to rotate at a low rotation speed, and the axial rotation locking of the eccentric shaft 2-11 and the eccentric output member 2-13 is realized through the latch rod 2-10, so that the eccentric output member 2-13 revolves around the second rotation axis z2 to form an eccentric rotation motion.
By adopting the mode switching mechanism of the electric polishing tool, the gear speed change mechanism is utilized to realize the high-low speed mode switching of the output rotating speed, and meanwhile, the latch rod 2-10 moving along with the speed change switching action of the gear speed change mechanism is used for controlling the locking state of the eccentric output piece 2-13, so that the eccentric output piece 2-13 can revolve and freely rotate under the high-speed output mode and can forcibly revolve and move under the low-speed output mode, the eccentric output piece 2-13 can synchronously change the output mode along with the high-low speed switching of the gear speed change mechanism, and the selection flexibility of the working mode of the electric polishing tool is met; and compared with the mode selection transmission mechanism of the existing polishing machine, the transmission ratio design of the gear speed change mechanism is not limited by the eccentricity, so that the optimal transmission ratio output is convenient to realize, and the working performance of the eccentric polishing machine is favorably improved.
As shown in fig. 4 to 7, in the present embodiment, the gear shifting mechanism preferably adopts a two-stage gear shifting mechanism, so that two-stage speed shifting with high and low speeds can be realized, the structure is simple, and the transmission is stable. Specifically, the gear speed change mechanism comprises a transmission shell 2-1, an intermediate transmission shaft 2-2, a primary transmission gear 2-4, a secondary transmission gear 2-6, an output shaft 2-7, a primary driven gear 2-8-1 and a secondary driven gear 2-8-2, wherein the intermediate transmission shaft 2-2 is arranged in the transmission shell 2-1 by taking a first rotation axis z1 as a rotation axis, the output shaft 2-7 is arranged in the transmission shell 2-1 by taking a second rotation axis z2 as a rotation axis, a first rotation axis z1 is parallel to a second rotation axis z2, the primary transmission gear 2-4 and the secondary transmission gear 2-6 are axially arranged on the intermediate transmission shaft 2-2 up and down, and the primary transmission gear 2-4 is positioned above the secondary transmission gear 2-6, the primary driven gear 2-8-1 and the secondary driven gear 2-8-2 are fixedly connected and are axially and vertically slidably mounted on the output shaft 2-7, and the primary driven gear 2-8-1 and the secondary driven gear 2-8-2 can axially slide to realize transmission meshing with different transmission ratios. The first-stage driven gear 2-8-1 and the second-stage driven gear 2-8-2 are driven by the mode selection mechanism 3 to axially move up and down on the output shaft 2-7, wherein:
When the mode selection mechanism 3 is in a high-speed output mode, the primary drive gear 2-4 is meshed with the primary driven gear 2-8-1, the secondary drive gear 2-6 is separated from the secondary driven gear 2-8-2 (as shown in a state of figure 6), at the moment, the primary drive gear 2-4 drives the primary driven gear 2-8-1 to rotate at a high-speed transmission ratio, thereby driving the output shaft 2-7 to rotate at a high speed and transmitting the rotating speed and the torque to the eccentric shaft 2-11, so that the eccentric shaft 2-11 rotates at a high speed around the second rotating axis z2, the eccentric shaft 2-11 rotates to drive the eccentric output member 2-13 to do eccentric rotation movement together, and the eccentric output member 2-13 is now in an axially free state, the eccentric output member 2-13 is free to rotate about the third axis of rotation z 3.
When the mode selection mechanism 3 is in a low-speed output mode, the first-stage transmission gear 2-4 is disengaged from the first-stage driven gear 2-8-1, the second-stage transmission gear 2-6 is engaged with the second-stage driven gear 2-8-2 (as shown in fig. 4), at this time, the second-stage transmission gear 2-6 drives the second-stage driven gear 2-8-2 to rotate at a low-speed transmission ratio, further driving the output shaft 2-7 to rotate and transmitting the rotation speed and the torque to the eccentric shaft 2-11, so that the eccentric shaft 2-11 rotates around the second rotation axis z2 at a low speed, the eccentric shaft 2-11 rotates to drive the eccentric output member 2-13 to do eccentric rotation together, and at this time, the eccentric output member 2-13 is in an axial locking state, so that the eccentric output member 2-13 cannot freely rotate around the third rotation axis z3, this allows greater output torque to be transmitted.
With reference to fig. 4 to 7, in order to facilitate fast and stable engagement of gears of each stage of the two-stage gear shifting mechanism, in the present embodiment, a first-stage transmission gear 2-4 is axially and vertically slidably mounted on the intermediate transmission shaft 2-2, a first elastic member 2-5 is disposed above the first-stage transmission gear 2-4, and a second elastic member 2-9 is disposed above the first-stage driven gear 2-8-1. The first elastic part 2-5 and the second elastic part 2-9 are preferably compression springs, the first elastic part 2-5 (compression spring) is sleeved on the middle transmission shaft 2-2, and the second elastic part 2-9 (compression spring) is sleeved on the output shaft 2-7. A certain distance is reserved between the primary transmission gear 2-4 and the secondary transmission gear 2-6, and switching transition of the primary driven gear 2-8-1 and the secondary driven gear 2-8-2 is achieved. When the mode selection mechanism 3 is switched from a low-speed output mode to a high-speed output mode, namely, when the mode selection mechanism is switched from the low-speed output mode shown in fig. 4 to the high-speed output mode shown in fig. 6, the mode selection mechanism 3 drives the primary driven gear 2-8-1 and the secondary driven gear 2-8-2 to move upwards together, at the moment, the second elastic part 2-9 is compressed, when the tooth surfaces of the primary driven gear 2-8-1 and the primary transmission gear 2-4 are not aligned, the primary transmission gear 2-4 can move upwards along with the axial direction of the primary driven gear 2-8-1 to form a state shown in fig. 5, at the moment, the first elastic part 2-5 is compressed, the tooth surface position can be automatically found when the primary transmission gear 2-4 rotates, the primary transmission gear 2-4 moves downwards under the action of the first elastic part 2-5, the stable meshing of the primary driven gear 2-8-1 and the primary transmission gear 2-4 is realized. When the mode selection means is switched from the high-speed output mode to the low-speed output mode, that is, from the "high-speed output mode" shown in FIG. 6 to the "low-speed output mode" shown in FIG. 4, when the tooth surfaces of the secondary driven gear 2-8-2 and the secondary transmission gear 2-6 are not aligned, the secondary driven gear 2-8-2 can elastically abut against the end face of the secondary transmission gear 2-6 under the action of the second elastic piece 2-9 to form a state shown in figure 7, at this time, the mode selection mechanism 3 is switched to be in place, the tooth surface position can be automatically found when the secondary transmission gear 2-6 rotates, and the secondary driven gear 2-8-2 moves downwards under the action of the second elastic part 2-9, so that the secondary driven gear 2-8-2 is stably meshed with the secondary transmission gear 2-6. By adopting the design, the mode selection mechanism 3 is more convenient to operate, the problems of mode switching operation clamping stagnation, gear beating and the like are effectively avoided, and the mode switching operation convenience, the use stability and the reliability of the electric polishing tool are improved.
As shown in fig. 11 and 12, in this embodiment, the intermediate transmission shaft 2-2 is in spline connection with the first-stage transmission gear 2-4, that is, a transmission shaft spline groove 2-2a is formed in the intermediate transmission shaft 2-2, a transmission gear internal spline 2-4a is formed in an inner hole of the first-stage transmission gear 2-4, and the transmission gear internal spline 2-4a is adapted to the transmission shaft spline groove 2-2a, so that the first-stage transmission gear 2-4 can axially slide on the intermediate transmission shaft 2-2, and can axially rotate along with the intermediate transmission shaft 2-2 and transmit torque. The middle part of the middle transmission shaft 2-2 can limit the first-stage transmission gear 2-4 through a shaft clamp spring. The secondary transmission gear 2-6 can adopt a shaft tooth structure, namely, the secondary transmission gear 2-6 is integrally formed on the intermediate transmission shaft 2-2. The primary driven gear 2-8-1 and the secondary driven gear 2-8-2 can adopt a dual gear design to form the dual gear 2-8, and the dual gear has simple structure and convenient processing and manufacturing. The duplicate gears 2-8 are connected with the output shafts 2-7 through splines, namely output shaft spline grooves 2-7a are formed in the output shafts 2-7, duplicate gear internal splines 2-8a are arranged in inner holes of the duplicate gears 2-8, and the duplicate gear internal splines 2-8a are matched with the output shaft spline grooves 2-7a, so that the duplicate gears 2-8 can axially slide on the output shafts 2-7 and can transmit axial rotation torque.
Further, as shown in fig. 6, 9 and 12, the upper end of the plug rod 2-10 is mounted on the secondary driven gear 2-8-2, the lower end of the plug rod passes through the plug hole 2-11-1 on the eccentric shaft 2-11 to be matched with the plug slot 2-13-2, the plug rod 2-10 can be located in the plug hole 2-11-1 in both the high-speed output mode and the low-speed output mode, so that the eccentric shaft 2-11 is driven by the duplicate gear 2-8 to rotate together, the rotating speed and the torque can be transmitted to the eccentric shaft 2-11 by using the plug rod 2-10, and the structure design is simple and compact. In order to make the eccentric shaft 2-11 rotate more stably, a balancing weight 2-11-2 is also arranged on the eccentric shaft 2-11 to counteract the eccentric vibration of the eccentric shaft 2-11. As shown in fig. 9 and 10, in the above-mentioned eccentric output member 2-13, the upper end thereof has a tip 2-13-1, the outer diameter of the tip 2-13-1 is slightly larger than the outer diameter of the lower portion of the eccentric output member 2-13, and the latch groove 2-13-2 is provided on the tip 2-13-1. Preferably, 2-3 bolt rods 2-10 are uniformly arranged on the circumference by taking the second rotation axis z2 as a circle center, and 6 bolt grooves 2-13-2 can be arranged on the end head 2-13-1, so as to more stably transmit output torque.
Referring to fig. 4 to 9, in the present embodiment, the upper end of the intermediate transmission shaft 2-2 is supported on the upper portion of the transmission housing 2-1 through the transmission shaft upper bearing 2-2-1, the lower end is supported on the lower portion of the transmission housing 2-1 through the transmission shaft lower bearing 2-2-2, the upper end of the output shaft 2-7 is supported on the upper portion of the transmission housing 2-1 through the output shaft upper bearing 2-7-1, the lower end is engaged with the shaft hole of the eccentric shaft 2-11, the eccentric shaft 2-11 is supported on the lower portion of the transmission housing 2-1 through the eccentric shaft bearing 2-12 around the second rotation axis z2, the output shaft 2-7 is supported on the upper portion of the output shaft 2-7-1 and the eccentric shaft bearing 2-12, the eccentric output member 2-13 is supported on the eccentric shaft 2-13 through the rotation bearing 2-14 around the third rotation axis z3 -11. In order to facilitate assembly, a clamp spring groove is formed in the upper end of the eccentric shaft 2-11, and the upper end of the eccentric shaft 2-11 is axially limited with the eccentric shaft bearing 2-12 through a clamp spring. By adopting the bearing supporting structure, each rotating part can rotate smoothly and stably, and the transmission of the electric polishing tool is more efficient. The centers of the eccentric output members 2 to 13 are provided with screw holes for connecting to a base member of the electric polishing tool centering on the third rotation axis z 3.
The mode selection mechanism 3 in this embodiment is a switching mechanism that drives the dual gears 2 to 8 to move up and down axially, and can be implemented by using the existing design of a knob or a push button. As shown in fig. 8 and 9, in the present embodiment, the mode selection mechanism 3 comprises a shift knob 3-1 and a fork 3-2, the fork 3-2 is slidably mounted in the transmission housing 2-1 up and down through a guide rod 3-3, and is matched with a primary driven gear 2-8-1 or a secondary driven gear 2-8-2, is used for driving the first-stage driven gear 2-8-1 and the second-stage driven gear 2-8-2 to axially move up and down on the output shaft 2-7, preferably to ensure that the shifting fork 3-2 is supported at the bottom of the second-stage driven gear 2-8-2, therefore, when the low-speed output mode is switched, the position of the shifting fork 3-2 can be switched in place firstly, and the second elastic piece 2-9 is utilized to realize downward movement of the duplicate gear 2-8 so as to realize gear meshing transmission. The speed change knob 3-1 is provided with an eccentric driving lever 3-1-1, one side of a shifting fork 3-2 is provided with a horizontal waist-shaped hole 3-2-1, the speed change knob 3-1 is axially and rotatably installed on the transmission shell 2-1, the eccentric driving lever 3-1-1 is located in the horizontal waist-shaped hole 3-2-1, and the speed change knob 3-1 drives a primary driven gear 2-8-1 and a secondary driven gear 2-8-2 to axially move up and down through the shifting fork 3-2. The limiting of two mode gears is realized on the speed change knob 3-1 through the limiting clamping groove, the shifting fork 3-2 can be driven to move up and down by rotating the speed change knob 3-1, the dual gear 2-8 is switched between a high-speed mode and a low-speed mode, the structure is simple, and the operation is convenient.
[ example 2]
As shown in fig. 1, 2 and 3 in conjunction, the present embodiment relates to a dual-mode eccentric polishing machine having the electric polishing tool mode switching mechanism of embodiment 1 described above. The double-mode eccentric polishing machine comprises a handle 1, a machine head 2 and a polishing bottom plate 4, wherein a motor 1-2 is arranged in the handle 1, the mode switching mechanism of the electric polishing tool in the embodiment 1 is arranged in the machine head 2, a motor shaft 1-3 of the motor 1-2 is in transmission connection with an input end of a gear speed change mechanism, and the polishing bottom plate 4 is fixedly arranged on an eccentric output part 2-13. When the gear speed change mechanism is in a high-speed output mode, the motor 1-2 drives the polishing bottom plate 4 to revolve around the second rotation axis z2 through the gear speed change mechanism and to rotate freely around the third rotation axis z 3; when the gear shifting mechanism is in a low-speed output mode, the motor 1-2 drives the polishing bottom plate 4 to revolve around the second rotation axis z2 through the gear shifting mechanism.
Specifically, the handle 1 comprises a handle housing 1-1, a motor 1-2 and a control element are installed in the handle housing 1-1, the axis of a motor shaft 1-3 of the motor 1-2 is perpendicular to a first rotation axis z1, and the output end of the motor shaft 1-3 is supported by a motor shaft bearing 1-4. In order to facilitate the heat dissipation inside the handle 1, a heat dissipation fan 1-6 is further arranged on the motor shaft 1-3, and the quick heat dissipation of the motor is achieved along with the operation of the motor 1-2. The output end of the motor shaft 1-3 is preferably in transmission connection with the input end of the gear speed change mechanism by adopting a bevel gear set, specifically, the end part of the motor shaft 1-3 is provided with a first bevel gear 1-5, the upper part of the middle transmission shaft 2-2 is provided with a second bevel gear 2-3, the first bevel gear 1-5 is meshed with the second bevel gear 2-3, the motor 1-2 drives the middle transmission shaft 2-2 to rotate through the bevel gear set, the output shaft 2-7 is driven to rotate after gear speed change, and the polishing bottom plate 4 is driven to move through the eccentric shaft 2-11 and the eccentric output part 2-13. The polishing bottom plate 4 and the eccentric output pieces 2-13 can be fixedly connected by screws.
The outer side of the machine head 2 can adopt a machine head shell supported by plastics, the machine head shell is connected with the handle shell 1-1, and the mode switching mechanism of the electric polishing tool is positioned in the machine head shell. The dust cover 2-1-1 is arranged at the bottom of the machine head 2, the dust suction port 2-1-2 is arranged on the dust cover 2-1-1, and dust after grinding and polishing can be quickly sucked away by connecting dust suction equipment. In addition, in order to facilitate the operation of the eccentric polishing machine, handle holes 2-1-3 are also formed in the left side and the right side of the machine head 2, and auxiliary handles 5 can be installed on the left side or the right side of the machine head 2.
Other specific structures and working principles which are not described in the eccentric polishing machine are similar to the prior art, and are not described herein.
According to the mode switching mechanism of the electric polishing tool and the dual-mode eccentric polishing machine, the gear speed change mechanism is used for realizing high-low speed mode switching of output rotating speed, meanwhile, the locking state of the eccentric output piece is controlled through the bolt rod moving along with the speed change switching action of the gear speed change mechanism, so that the eccentric output piece can revolve and freely rotate under a high-speed output mode, and can forcibly revolve and move under a low-speed output mode, the output mode can be synchronously changed along with the high-low speed switching of the gear speed change mechanism, and the selection flexibility of the working mode of the electric polishing tool is met; and compared with the mode selection transmission mechanism of the existing polishing machine, the transmission ratio design of the gear speed change mechanism is not limited by the eccentricity, so that the optimal transmission ratio output is convenient to realize, the working performance of the eccentric polishing machine is favorably improved, and the mode selection transmission mechanism has the advantages of simple structure, convenience in processing and manufacturing, stable transmission, flexibility and convenience in mode switching operation and the like.
The present invention and its embodiments have been described above schematically, and the description is not intended to be limiting, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, without departing from the spirit of the present invention, a person of ordinary skill in the art should also understand that the present invention shall not be limited to the embodiments and the similar structural modes of the present invention.
Claims (10)
1. An electric polishing tool mode switching mechanism, characterized in that: comprises a gear speed change mechanism, a bolt rod (2-10), an eccentric shaft (2-11) and an eccentric output piece (2-13), the eccentric shaft (2-11) is provided with a second rotating axis (z2) and a third rotating axis (z3) which are parallel, the output end of the gear speed change mechanism is in transmission connection with the eccentric shaft (2-11), used for driving the eccentric shaft (2-11) to rotate around the second rotation axis (z2), the eccentric output piece (2-13) is rotationally connected with the eccentric shaft (2-11) by taking the third rotation axis (z3) as a rotation axis, the eccentric output piece (2-13) is provided with a plurality of plug pin grooves (2-13-2), and the plug pin rod (2-10) has two working modes of being disengaged or engaged with the plug pin grooves (2-13-2) along with the variable speed switching action of the gear speed change mechanism;
When the gear shifting mechanism is in a high-speed output mode, the latch rod (2-10) is disengaged from the latch groove (2-13-2), so that the eccentric output piece (2-13) revolves around the second rotation axis (z2) and freely rotates around the third rotation axis (z 3);
when the gear shifting mechanism is in a low-speed output mode, the latch rod (2-10) is engaged with the latch groove (2-13-2) to enable the eccentric output piece (2-13) to revolve around the second rotation axis (z 2).
2. The electric polishing tool mode switching mechanism according to claim 1, wherein: the gear speed change mechanism comprises a transmission shell (2-1), a middle transmission shaft (2-2), a primary transmission gear (2-4), a secondary transmission gear (2-6), an output shaft (2-7), a primary driven gear (2-8-1) and a secondary driven gear (2-8-2), wherein the middle transmission shaft (2-2) is arranged in the transmission shell (2-1) by taking a first rotation axis (z1) as a rotation axis, the output shaft (2-7) is arranged in the transmission shell (2-1) by taking a second rotation axis (z2) as a rotation axis, the first rotation axis (z1) is parallel to the second rotation axis (z2), and the primary transmission gear (2-4) and the secondary transmission gear (2-6) are axially arranged on the middle transmission shaft (2-2) up and down, the primary driven gear (2-8-1) and the secondary driven gear (2-8-2) are fixedly connected and axially and vertically slidably mounted on the output shaft (2-7); the primary driven gear (2-8-1) and the secondary driven gear (2-8-2) are driven by the mode selection mechanism (3) to axially move up and down on the output shaft (2-7), wherein:
When the mode selection mechanism (3) is in a high-speed output mode, the primary transmission gear (2-4) is meshed with the primary driven gear (2-8-1), and the secondary transmission gear (2-6) is separated from the secondary driven gear (2-8-2);
when the mode selection mechanism (3) is in a low-speed output mode, the primary transmission gear (2-4) is disengaged from the primary driven gear (2-8-1), and the secondary transmission gear (2-6) is meshed with the secondary driven gear (2-8-2).
3. The electric polishing tool mode switching mechanism according to claim 2, wherein: the first-stage transmission gear (2-4) is axially and vertically slidably mounted on the middle transmission shaft (2-2), a first elastic piece (2-5) is arranged above the first-stage transmission gear (2-4), and a second elastic piece (2-9) is arranged above the first-stage driven gear (2-8-1).
4. The electric polishing tool mode switching mechanism according to claim 3, wherein: the first elastic part (2-5) and the second elastic part (2-9) are compression springs.
5. The electric polishing tool mode switching mechanism according to claim 2, wherein: the upper end of the bolt rod (2-10) is arranged on the secondary driven gear (2-8-2), and the lower end of the bolt rod passes through a bolt hole (2-11-1) on the eccentric shaft (2-11) to be matched with the bolt groove (2-13-2).
6. The electric polishing tool mode switching mechanism according to claim 5, wherein: the primary driven gear (2-8-1) and the secondary driven gear (2-8-2) form a duplicate gear (2-8).
7. The electric polishing tool mode switching mechanism according to claim 2, wherein: the upper end of the middle transmission shaft (2-2) is supported on the upper part of the transmission shell (2-1) through a transmission shaft upper bearing (2-2-1), the lower end is supported on the lower part of the transmission shell (2-1) through a transmission shaft lower bearing (2-2-2), the upper end of the output shaft (2-7) is supported on the upper part of the transmission shell (2-1) through an output shaft upper bearing (2-7-1), the lower end is matched with the shaft hole of the eccentric shaft (2-11), the eccentric shaft (2-11) is axially rotatably supported around a second rotating axis (z2) by an eccentric shaft bearing (2-12) at the lower part of the transmission housing (2-1), the eccentric output element (2-13) is axially rotatably mounted in the eccentric shaft (2-11) about a third axis of rotation (z3) by means of a rotation bearing (2-14).
8. The electric polishing tool mode switching mechanism according to any one of claims 2 to 7, wherein: the mode selection mechanism (3) comprises a speed change knob (3-1) and a shifting fork (3-2), wherein the shifting fork (3-2) is vertically and slidably arranged in the transmission shell (2-1) through a guide rod (3-3) and is matched with the first-stage driven gear (2-8-1) or the second-stage driven gear (2-8-2) to drive the first-stage driven gear (2-8-1) and the second-stage driven gear (2-8-2) to axially move up and down on the output shaft (2-7); the speed change mechanism is characterized in that an eccentric driving lever (3-1-1) is arranged on the speed change knob (3-1), a horizontal waist-shaped hole (3-2-1) is formed in one side of the shifting fork (3-2), the speed change knob (3-1) is axially and rotatably installed on the transmission shell (2-1), the eccentric driving lever (3-1-1) is located in the horizontal waist-shaped hole (3-2-1), and the speed change knob (3-1) drives the first-stage driven gear (2-8-1) and the second-stage driven gear (2-8-2) to axially move up and down through the shifting fork (3-2).
9. A dual-mode eccentric polishing machine is characterized in that: the polishing machine comprises a handle (1), a machine head (2) and a polishing bottom plate (4), wherein a motor (1-2) is arranged in the handle (1), the machine head (2) is internally provided with the electric polishing tool mode switching mechanism as claimed in any one of claims 1 to 8, a motor shaft (1-3) of the motor (1-2) is in transmission connection with an input end of a gear speed change mechanism, and the polishing bottom plate (4) is fixedly arranged on an eccentric output member (2-13);
when the gear speed change mechanism is in a high-speed output mode, the motor (1-2) drives the polishing bottom plate (4) to revolve around the second rotation axis (z2) through the gear speed change mechanism and to rotate freely around the third rotation axis (z 3);
when the gear shifting mechanism is in a low-speed output mode, the motor (1-2) drives the polishing bottom plate (4) to revolve around the second rotation axis (z2) through the gear shifting mechanism.
10. A dual-mode eccentric polisher in accordance with claim 9 with the following features: the output end of the motor shaft (1-3) is in transmission connection with the input end of the gear speed change mechanism by adopting a bevel gear set; the bottom of the machine head (2) is provided with a dust cover (2-1-1), and the dust cover (2-1-1) is provided with a dust suction port (2-1-2).
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