Electric polishing tool mode switching mechanism with clutch function and dual-mode eccentric polishing machine

Abstract

The utility model discloses an electric polishing tool mode switching mechanism with a clutch function and a dual-mode eccentric polishing machine. The electric polishing tool mode switching mechanism comprises a gear speed change mechanism, a bolt rod, an eccentric shaft and an eccentric output piece, 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, in a high-speed output mode, the first-stage transmission gear is meshed with the first-stage driven gear, and the second-stage transmission gear is separated from the second-stage driven gear; and the ratchet block and the groove between the first-stage driven gear and the second-stage driven gear are correspondingly inserted, embedded and matched. According to the mode switching mechanism of the electric polishing tool, the problems of clamping stagnation, gear tooth breaking and the like in the mode switching operation process are effectively avoided, the convenience and the use stability and reliability of the mode switching operation of the electric polishing tool are improved, and the service life of the mode switching mechanism of the electric polishing tool is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of electric grinding and polishing tools, in particular to an electric polishing tool mode switching mechanism with a clutch function and a double-mode eccentric polishing machine. Background Art

[0002] Electric grinding and polishing tools are a commonly used electric tool. They are mechanical equipment that completes the grinding and sanding of material surfaces. They can be used for grinding surfaces such as wood products, metal products, plastic products, and walls. Existing electric eccentric grinding and polishing tools use a motor to drive the eccentric shaft to move, and use the eccentric shaft to drive the grinding and polishing base plate to move. During operation, the eccentric shaft rotates around the drive shaft of the motor (the first rotation axis), and the second rotation axis on the eccentric shaft that is parallel to the first rotation axis also rotates around the first rotation axis. In this way, the grinding and polishing base plate rotates around the second rotation axis and revolves around the first rotation axis at the same time, forming a random orbital motion.

[0003] At present, the above-mentioned eccentric polishing machine usually has two working modes, high speed and low speed. In the high speed mode, the grinding and polishing base plate is required to revolve around the first rotation axis and rotate freely around the second rotation axis, so that the grinding and polishing base plate rotates at high speed and ensures its safety in use; in the low speed mode, the grinding and polishing base plate is required to revolve around the first rotation axis and rotate forcibly around the second rotation axis, so as to ensure that the grinding and polishing base plate has a larger output torque under the low speed rotation state. For example, a "polishing machine" disclosed in Chinese utility model patent No. ZL201621126145.7 has a mode selection transmission mechanism composed of an internal gear component, a cylindrical gear component and a mode switching knob with a coupling pin. An engaging groove matched with the engaging pin is provided on the outer periphery of the internal gear component. In the low-speed mode, the engaging pin is inserted into the engaging groove of the internal gear component to fix the internal gear component. At this time, the cylindrical gear component is forced to rotate in the internal gear component, so that the grinding and polishing base plate rotates together with the cylindrical gear component and revolves around the first rotation axis; in the high-speed mode, the engaging pin is disengaged from the engaging groove of the internal gear component. At this time, the internal gear component can rotate freely, and the grinding and polishing base plate can rotate freely around the second rotation axis and revolve around the first rotation axis at the same time. The mode selection transmission mechanism in the above patent application has the advantages of simple and compact structure, but its low-speed mode is achieved by rotating the cylindrical gear component inside the internal gear component, that is, the cylindrical gear component and the internal gear component need to always maintain a meshing state. When changing the low-speed transmission ratio, it is necessary to consider the reasonable range of the eccentricity of the grinding and polishing base plate, which makes the design of the low-speed transmission ratio have certain limitations.

[0004] In order to solve the limitation problem that traditional eccentric polishing machines need to consider the reasonable range of eccentric distance of grinding and polishing base plates when changing the low-speed transmission ratio, Chinese invention patent No. ZL202210241560.0 discloses an electric polishing tool mode switching mechanism and a dual-mode eccentric polishing machine, wherein the mode switching mechanism includes a gear transmission mechanism, a latch rod, an eccentric shaft and an eccentric output member, and the eccentric output member is provided with a plurality of latch grooves, and the latch rod has two working modes of being disengaged from or engaged with the latch grooves. When the gear transmission mechanism is in the high-speed output mode, the latch rod is disengaged from the latch groove, so that the eccentric output member revolves around the second rotation axis and rotates freely around the third rotation axis; when the gear transmission mechanism is in the low-speed output mode, the latch rod is engaged with the latch groove, so that the eccentric output member revolves around the second rotation axis. The mode switching mechanism in the above patent application improves the flexibility of the working mode selection of the electric polishing tool, and can facilitate the realization of the optimal transmission ratio output, which is beneficial to improving the working performance of the eccentric polishing machine; however, during the switching process between the high-speed mode and the low-speed mode, since the double gears with an integrated structural design are in a synchronous motion state following the output shaft, the first-stage driven gear on the double gears and the first-stage transmission gears are meshed, or the second-stage driven gears on the double gears and the second-stage transmission gears are meshed, and the gears are prone to jamming, gear knocking, and other phenomena that cannot be meshed in place in time, which causes the teeth on the gears in the mode switching mechanism to be easily impacted and damaged, seriously affecting the reliability and service life of the mode switching mechanism of the electric polishing tool. To this end, the utility model proposes an electric polishing tool mode switching mechanism with a clutch function and a dual-mode eccentric polishing machine, in order to solve the above technical problems. Summary of the invention

[0005] The purpose of the utility model is to overcome the defects in the prior art and provide an electric polishing tool mode switching mechanism and a dual-mode eccentric polishing machine with a clutch function. The primary driven gear and the secondary driven gear are designed as a split structure, and the mode selection mechanism drives the secondary driven gear to move axially up and down on the spline groove of the output shaft to achieve switching between a high-speed output mode and a low-speed output mode. Compared with the double gears of the traditional one-piece structural design, the utility model effectively avoids problems such as jamming and gear tooth punching during the mode switching operation, improves the convenience of the mode switching operation of the electric polishing tool, and improves the stability and reliability of use, which helps to extend the service life of the mode switching mechanism of the electric polishing tool; in the high-speed and low-speed output mode switching process of the electric polishing tool mode switching mechanism, the primary driven gear and the secondary driven gear are plug-in and fitted or disengaged through the ratchet block and the groove, which is convenient and efficient to operate, even if the mode switching mechanism of the electric polishing tool has a clutch function; the overall structural design is simple, the preparation and implementation feasibility is high, and the practicability is strong.

[0006] To achieve the above-mentioned purpose, one of the purposes of the utility model is to design an electric polishing tool mode switching mechanism with a clutch function, including a gear speed change mechanism, a latch rod, an eccentric shaft and an eccentric output member, the eccentric shaft having a second rotation axis and a third rotation axis parallel to each other, the output end of the gear speed change mechanism is transmission-connected to the eccentric shaft for driving the eccentric shaft to rotate around the second rotation axis, the eccentric output member is rotationally connected to the eccentric shaft with the third rotation axis as the rotation axis, the eccentric output member is provided with a plurality of latch grooves, the latch rod has two working modes of disengaging from or engaging with the latch grooves as the gear speed change mechanism changes speed and switches, the gear speed change mechanism comprises a transmission housing, an intermediate transmission shaft, a primary transmission gear, a secondary transmission gear, an output shaft, a primary driven gear and a secondary driven gear, the intermediate transmission shaft has a first rotation axis The first gear is installed in the transmission housing with a rotation axis as the rotation axis, the output shaft is installed in the transmission housing with the second rotation axis as the 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 installed up and down on the intermediate transmission shaft, the first-stage driven gear is axially slidably installed up and down on the smooth section located on the upper side of the output shaft, and the second-stage driven gear is axially slidably installed up and down on the output shaft spline groove located on the lower side of the output shaft through the central spline hole; a ratchet block is provided on one of the lower end face of the first-stage driven gear and the upper end face of the second-stage driven gear, and a groove corresponding to the ratchet block is provided on the other of the lower end face of the first-stage driven gear and the upper end face of the second-stage driven gear; the second-stage driven gear is driven by the mode selection mechanism to move axially up and down on the spline groove of the output shaft, wherein:

[0007] When the gear speed change mechanism is in high-speed output mode, the latch rod is disengaged from the latch slot, so that the eccentric output member revolves around the second rotation axis and rotates freely around the third rotation axis, the primary transmission gear is meshed with the primary driven gear, the secondary transmission gear is disengaged from the secondary driven gear, and the ratchet block and the groove between the lower end face of the primary driven gear and the upper end face of the secondary driven gear are correspondingly plugged and fitted;

[0008] When the gear speed change mechanism is in the low-speed output mode, the latch rod is engaged with the latch groove, causing the eccentric output member to revolve around the second rotation axis, the primary transmission gear is meshed with the primary driven gear, the secondary transmission gear is meshed with the secondary driven gear, and the ratchet block and the groove between the lower end face of the primary driven gear and the upper end face of the secondary driven gear are disengaged.

[0009] The utility model discloses an electric polishing tool mode switching mechanism with a clutch function. The primary driven gear and the secondary driven gear are designed as a split structure, and the mode selection mechanism drives the secondary driven gear to move axially up and down on the spline groove of the output shaft to achieve switching between a high-speed output mode and a low-speed output mode. Compared with the double gears of the traditional one-piece structural design, the utility model effectively avoids problems such as jamming and gear knocking during the mode switching operation, improves the convenience of the mode switching operation of the electric polishing tool, and improves the stability and reliability of use, which helps to extend the service life of the mode switching mechanism of the electric polishing tool. During the high-speed and low-speed output mode switching process of the electric polishing tool mode switching mechanism, the primary driven gear and the secondary driven gear are plug-in and fitted or disengaged through the ratchet block and the groove, which is convenient and efficient to operate, even if the mode switching mechanism of the electric polishing tool has a clutch function. The overall structural design is simple, the preparation and implementation feasibility is high, and the practicability is strong.

[0010] The preferred technical solution is that the primary transmission gear and the secondary transmission gear are both fixedly mounted on the intermediate transmission shaft, the outer diameter of the output shaft spline groove is greater than the outer diameter of the smooth section, an elastic member is provided above the primary driven gear, and an elastic member is provided above the primary driven gear for limiting the primary driven gear to abut against the lower end of the smooth section. Through the elastic driving force of the elastic member and the supporting effect of the top surface of the output shaft spline groove, it is ensured that the primary driven gear is always located at the lower end of the smooth section of the output shaft and precisely meshes with the primary transmission gear.

[0011] A further preferred technical solution is that the elastic member is a compression spring sleeved on the upper end of the smooth section.

[0012] A further preferred technical solution is that the lower end face of the primary driven gear is provided with a coaxial truncated cone, there are two ratchet blocks, the two ratchet blocks are correspondingly arranged at the two ends of the same diameter of the lower end face of the truncated cone, and the lower end face of the ratchet block is set as a slope structure gradually extending from one end to the other end; there are two grooves, the two grooves are correspondingly arranged on the upper end face of the secondary driven gear, and the bottom of the groove is set as a slope structure adapted to the ratchet block. The lower end face of the ratchet block and the bottom face of the groove are both set as adapted slope structures, so that when the mode selection mechanism drives the secondary driven gear to move upward on the spline groove of the output shaft and switch to the high-speed output mode, there is a guiding assembly function between the ratchet block and the groove, which helps to improve the efficiency of the ratchet block and the groove being fitted in place.

[0013] A further preferred technical solution is that the upper end of the latch rod is mounted on the secondary driven gear, and the lower end passes through the latch hole on the eccentric shaft and matches with the latch slot on the upper end of the eccentric output member. The latch rod can be used to transmit speed and torque to the eccentric shaft, and the structural design is simple and compact.

[0014] A further preferred technical solution is that the lower end face of the primary driven gear and the upper end face of the secondary driven gear form a separable double gear through the ratchet block and the groove. The primary driven gear and the secondary driven gear form a separable double gear through the ratchet block and the groove, so that the mode switching mechanism of the electric polishing tool of the utility model has a clutch function when switching between high and low output modes, effectively avoiding problems such as jamming and gear toothing during the mode switching operation.

[0015] A further preferred technical solution is that the upper end of the intermediate transmission shaft is supported on the upper part of the transmission housing through the transmission shaft upper bearing, and the lower end is supported on the lower part of the transmission housing through the transmission shaft lower bearing, the upper end of the output shaft is supported on the upper part of the transmission housing through the output shaft upper bearing, and the lower end cooperates with the eccentric shaft shaft hole, the eccentric shaft is supported in the lower part of the transmission housing by the eccentric shaft bearing for axial rotation around the second rotation axis, and the eccentric output member is supported in the eccentric shaft for axial rotation around the third rotation axis through the self-rotating bearing. The bearing support structure is adopted to make each rotating component rotate smoothly and stably, making the transmission of the electric polishing tool more efficient.

[0016] A further preferred technical solution is that the mode selection mechanism includes a speed knob and a shift fork, the shift fork is installed in the transmission housing through a guide rod to slide up and down, and cooperates with the secondary driven gear to drive the secondary driven gear to move up and down axially on the output shaft spline groove of the output shaft; the speed knob is provided with an eccentric lever, and one side of the shift fork is provided with a horizontal opening groove, the speed knob is axially rotatably installed on the transmission housing, and the eccentric lever is located in the horizontal opening groove, and the speed knob drives the secondary driven gear to move up and down axially through the shift fork. With this mode selection mechanism, the working mode of the electric polishing tool can be switched by rotating the speed knob, which has a simple structure and is easy to operate.

[0017] The second object of the utility model is to design a dual-mode eccentric polishing machine, including a handle, a head and a polishing base plate, wherein the handle has a motor, the head has the above-mentioned electric polishing tool mode switching mechanism with a clutch function, the motor shaft of the motor is transmission-connected to the input end of the gear speed change mechanism, and the polishing base plate is fixedly mounted on the eccentric output member;

[0018] When the gear speed change mechanism is in high-speed output mode, the motor drives the polishing base plate to revolve around the second rotation axis through the gear speed change mechanism, and freely rotate around the third rotation axis;

[0019] When the gear speed change mechanism is in the low-speed output mode, the motor drives the polishing base plate to revolve around the second rotation axis through the gear speed change mechanism.

[0020] The utility model discloses a dual-mode eccentric polishing machine, which adopts the electric polishing tool mode switching mechanism of the above structure, effectively avoiding problems such as sticking and gear knocking that occur during the mode switching operation, and realizes reliable and stable switching between high and low speed working modes, which helps to improve the working performance and service life of the eccentric polishing machine.

[0021] Preferably, the output end of the motor shaft and the input end of the gear speed change mechanism are connected by a bevel gear set; a head cover is provided on the upper part of the head, and a dust cover is provided on the bottom of the head, which is arranged above the outer peripheral side of the polishing base plate; the upper end of the dust cover is docked with the lower end of the head cover, and a dust suction port is provided on the dust cover, and the dust suction port is externally connected to a dust suction pipe.

[0022] The advantages and beneficial effects of the utility model are:

[0023] 1. The utility model discloses an electric polishing tool mode switching mechanism with a clutch function. The primary driven gear and the secondary driven gear are designed as a split structure, and the mode selection mechanism drives the secondary driven gear to move axially up and down on the spline groove of the output shaft to achieve switching between a high-speed output mode and a low-speed output mode. Compared with the double gears of the traditional integrated structure design, the utility model effectively avoids problems such as jamming and gear knocking during the mode switching operation, improves the convenience of the mode switching operation of the electric polishing tool, and improves the stability and reliability of use, which helps to extend the service life of the mode switching mechanism of the electric polishing tool. During the high-speed and low-speed output mode switching process of the electric polishing tool mode switching mechanism, the primary driven gear and the secondary driven gear are plug-in and fitted or disengaged through the ratchet block and the groove, which is convenient and efficient to operate, even if the mode switching mechanism of the electric polishing tool has a clutch function. The overall structural design is simple, the preparation and implementation feasibility is high, and the practicability is strong.

[0024] 2. The lower end surface of the ratchet block and the bottom surface of the groove are both set to a matching slope structure, so that when the mode selection mechanism drives the secondary driven gear to move upward on the spline groove of the output shaft to switch to the high-speed output mode, there is a guiding assembly function between the ratchet block and the groove, which helps to improve the efficiency of the ratchet block and the groove being embedded and matched in place.

[0025] 3. The lower end face of the primary driven gear and the upper end face of the secondary driven gear form a separable double gear through the ratchet block and the groove. The primary driven gear and the secondary driven gear form a separable double gear through the ratchet block and the groove, so that the mode switching mechanism of the electric polishing tool of the utility model has a clutch function when switching between high and low output modes, effectively avoiding problems such as jamming and gear toothing during the mode switching operation.

[0026] 4. The utility model is a dual-mode eccentric polishing machine, which adopts the electric polishing tool mode switching mechanism of the above structure, effectively avoiding problems such as jamming and gear knocking during the mode switching operation, and realizes reliable and stable switching between high and low speed working modes, which helps to improve the working performance and service life of the eccentric polishing machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a three-dimensional structural schematic diagram of a dual-mode eccentric polishing machine of the utility model (without the machine head cover, dust cover and dust suction pipe);

[0028] Figure 2 This is a longitudinal cross-sectional structural schematic diagram of a dual-mode eccentric polishing machine of the utility model (without the machine head cover, dust cover and dust suction pipe);

[0029] Figure 3 It is a longitudinal cross-sectional structural schematic diagram of a mode switching mechanism of an electric polishing tool with a clutch function (low-speed output mode) of the utility model;

[0030] Figure 4 It is a longitudinal cross-sectional structural diagram of a mode switching mechanism of an electric polishing tool with a clutch function (high-speed output mode) of the utility model;

[0031] Figure 5 It is a three-dimensional structural diagram of the internal transmission components of a mode switching mechanism of an electric polishing tool with a clutch function of the utility model;

[0032] Figure 6 It is a schematic diagram of the disassembled structure of the internal transmission components of a mode switching mechanism of an electric polishing tool with a clutch function of the utility model;

[0033] Figure 7 It is a schematic diagram of the installation structure of the transmission gear on the intermediate transmission shaft in the mode switching mechanism of an electric polishing tool with a clutch function of the utility model;

[0034] Figure 8 It is a schematic diagram of the installation structure of the driven gear on the output shaft in the mode switching mechanism of an electric polishing tool with a clutch function of the utility model;

[0035] Fig. 9 It is a schematic diagram of the installation structure of the secondary driven gear on the output shaft in the mode switching mechanism of an electric polishing tool with a clutch function of the utility model;

[0036] Fig.10 It is a bottom-up perspective view of the primary driven gear;

[0037] Fig.11 It is a three-dimensional structural schematic diagram of an eccentric output member;

[0038] Fig.12 It is a three-dimensional structural schematic diagram of a dual-mode eccentric polishing machine of the utility model.

[0039] In the figure: 1, handle; 1-1, handle housing; 1-2, motor; 1-3, motor shaft; 1-4, motor shaft bearing; 1-5, first bevel gear; 1-6, cooling fan; 2, machine head; 2-1, transmission housing; 2-1a, handle hole; 2-2, intermediate transmission shaft; 2-2-1, transmission shaft upper bearing; 2-2-2, transmission shaft lower bearing; 2-3, second bevel gear; 2-4, primary transmission gear; 2-5, secondary transmission gear; 2-6, output shaft; 2-6a, smooth section; 2-6b, output shaft spline groove; 2-6-1, output shaft upper bearing; 2-7, primary driven gear; 2-7a, ratchet block; 2-7b, round table; 2-8, secondary driven gear Wheel; 2-8a, groove; 2-9, elastic member; 2-10, latch rod; 2-11, eccentric shaft; 2-11-1, latch hole; 2-11-2, counterweight; 2-12, eccentric shaft bearing; 2-13, eccentric output member; 2-13-1, end; 2-13-2, latch slot; 2-14, rotation bearing; 3, mode selection mechanism; 3-1, speed knob; 3-1-1, eccentric lever; 3-2, fork; 3-2-1, horizontal opening slot; 3-3, guide rod; 4, polishing base plate; 5, machine head cover; 6, dust cover; 6-1, dust suction port; 7, dust suction tube; z1, first rotation axis; z2, second rotation axis; z3, third rotation axis. DETAILED DESCRIPTION

[0040] The following is a further description of the specific implementation of the present invention in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0041] Example 1

[0042] like Figures 3 to 11As shown, the utility model is an electric polishing tool mode switching mechanism with a clutch function, including a gear speed change mechanism, a latch rod 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, and the output end of the gear speed change mechanism is transmission-connected with the eccentric shaft 2-11 to drive the eccentric shaft 2-11 to rotate around the second rotation axis z2, and the eccentric output member 2-13 is rotationally connected to the eccentric shaft 2 with the third rotation axis z3 as the rotation axis. -11 rotation connection, the eccentric output member 2-13 has a plurality of latch grooves 2-13-2, the latch rod 2-10 has two working modes of disengaging or engaging with the latch groove 2-13-2 as the gear speed change mechanism changes speed, the gear speed change mechanism includes a transmission housing 2-1, an intermediate transmission shaft 2-2, a primary transmission gear 2-4, a secondary transmission gear 2-5, an output shaft 2-6, a primary driven gear 2-7 and a secondary driven gear 2-8, the intermediate transmission shaft 2-2 has a first rotation axis z1 as The rotation axis is installed in the transmission housing 2-1, the output shaft 2-6 is installed in the transmission housing 2-1 with the second rotation axis z2 as the rotation axis, the first rotation axis z1 is parallel to the second rotation axis z2, the first-stage transmission gear 2-4 and the second-stage transmission gear 2-5 are axially installed up and down on the intermediate transmission shaft 2-2, the first-stage driven gear 2-7 is axially slidably installed up and down on the smooth section 2-6a located on the upper side of the output shaft 2-6, and the second-stage driven gear 2-8 slides up and down axially through the spline hole in the center The first driven gear 2-7 is driven by the mode selection mechanism 3 and is driven on the output shaft spline groove 2-6b located at the lower side of the output shaft 2-6; a ratchet block 2-7a is provided on one of the lower end surface of the first driven gear 2-7 and the upper end surface of the second driven gear 2-8, and a groove 2-8a corresponding to the ratchet block 2-7a is provided on the other of the lower end surface of the first driven gear 2-7 and the upper end surface of the second driven gear 2-8; the second driven gear 2-8 is driven by the mode selection mechanism 3 to move axially up and down on the output shaft spline groove 2-6b, wherein:

[0043] When the gear speed change mechanism is in high-speed output mode, the latch rod 2-10 is disengaged from the latch groove 2-13-2, so that the eccentric output member 2-13 revolves around the second rotation axis z2 and rotates freely around the third rotation axis z3, the primary transmission gear 2-4 is meshed with the primary driven gear 2-7, the secondary transmission gear 2-5 is disengaged from the secondary driven gear 2-8, and the ratchet block 2-7a and the groove 2-8a between the lower end face of the primary driven gear 2-7 and the upper end face of the secondary driven gear 2-8 are correspondingly plugged and fitted;

[0044] When the gear speed change mechanism is in the low-speed output mode, the latch rod 2-10 is engaged with the latch groove 2-13-2, so that the eccentric output member 2-13 revolves around the second rotation axis z2, the primary transmission gear 2-4 is meshed with the primary driven gear 2-7, the secondary transmission gear 2-5 is meshed with the secondary driven gear 2-8, and the ratchet block 2-7a and the groove 2-8a between the lower end surface of the primary driven gear 2-7 and the upper end surface of the secondary driven gear 2-8 are disengaged. In order to make the eccentric shaft 2-11 rotate more smoothly, a counterweight block 2-11-2 is also provided on the eccentric shaft 2-11 to offset the eccentric vibration of the eccentric shaft 2-11.

[0045] Preferably, the first-stage transmission gear 2-4 and the second-stage transmission gear 2-5 are both fixedly mounted on the intermediate transmission shaft 2-2, the outer diameter of the output shaft spline groove 2-6b is greater than the outer diameter of the smooth section 2-6a, and an elastic member 2-9 is provided above the first-stage driven gear 2-7, and an elastic member 2-9 is provided above the first-stage driven gear 2-7 for limiting the first-stage driven gear 2-7 to abut against the lower end of the smooth section 2-6a.

[0046] Further preferably, the elastic member 2-9 is a compression spring sleeved on the upper end of the smooth section 2-6a.

[0047] Further preferably, the lower end face of the primary driven gear 2-7 is provided with a coaxial cone 2-7b, and there are two ratchet blocks 2-7a, which are correspondingly arranged at the two ends of the same diameter of the lower end face of the cone 2-7b, and the lower end face of the ratchet block 2-7a is set as a slope structure gradually extending from one end to the other end; there are two grooves 2-8a, which are correspondingly arranged on the upper end face of the secondary driven gear 2-8, and the bottom of the groove 2-8a is set as a slope structure compatible with the ratchet block 2-7a.

[0048] Further preferably, the upper end of the latch rod 2-10 is mounted on the secondary driven gear 2-8, and the lower end passes through the latch hole 2-11-1 on the eccentric shaft 2-11 and cooperates with the latch groove 2-13-2 located on the end head 2-13-1 at the upper end of the eccentric output member 2-13.

[0049] Further preferably, the lower end surface of the primary driven gear 2-7 and the upper end surface of the secondary driven gear 2-8 form a separable double gear through the ratchet block 2-7a and the groove 2-8a.

[0050] Preferably, the upper end of the intermediate transmission shaft 2-2 is supported on the upper part of the transmission housing 2-1 through the transmission shaft upper bearing 2-2-1, and the lower end is supported on the lower part of the transmission housing 2-1 through the transmission shaft lower bearing 2-2-2. The upper end of the output shaft 2-6 is supported on the upper part of the transmission housing 2-1 through the output shaft upper bearing 2-6-1, and the lower end cooperates with the axial hole of the eccentric shaft 2-11. The eccentric shaft 2-11 is axially rotatably supported around the second rotation axis z2 in the lower part of the transmission housing 2-1 through the eccentric shaft bearing 2-12, and the eccentric output member 2-13 is axially rotatably supported around the third rotation axis z3 in the eccentric shaft 2-11 through the rotation bearing 2-14.

[0051] Further preferably, the mode selection mechanism 3 includes a speed shift knob 3-1 and a shift fork 3-2, the shift fork 3-2 is installed in the transmission housing 2-1 through a guide rod 3-3 for sliding up and down, and cooperates with the secondary driven gear 2-8 to drive the secondary driven gear 2-8 to move axially up and down on the output shaft spline groove 2-6b of the output shaft 2-6; the speed shift knob 3-1 is provided with an eccentric shift rod 3-1-1, and a horizontal opening groove 3-2-1 is provided on one side of the shift fork 3-2, the speed shift knob 3-1 is axially rotatably installed on the transmission housing 2-1, and the eccentric shift rod 3-1-1 is located in the horizontal opening groove 3-2-1, and the speed shift knob 3-1 drives the secondary driven gear 2-8 to move axially up and down through the shift fork 3-2.

[0052] The high and low output mode switching principle of the mode switching mechanism of the electric polishing tool with clutch function in Example 1 is as follows:

[0053] The principle of the gear transmission mechanism changing from low-speed output mode to high-speed output mode: See the attached Figure 3 , rotate the speed knob 3-1 by 180°, during which the eccentric lever 3-1-1 pushes the shift fork 3-2 to drive the secondary driven gear 2-8 to move upward along the spline groove 2-6b of the output shaft, and the ratchet block 2-7a on the lower end surface of the primary driven gear 2-7 is gradually inserted into the groove 2-8a on the upper end surface of the secondary driven gear 2-8 (see the attached Figure 4 ), so that the primary driven gear 2-7 and the secondary driven gear 2-8 are assembled into a double gear. At this time, the motor shaft 1-3 of the motor 1-2 drives the second bevel gear 2-3 to rotate through the first bevel gear 1-5, so that the primary transmission gear 2-4 drives the secondary driven gear 2-8 and the output shaft 2-6 to rotate through the primary driven gear 2-7, and the output shaft 2-6 drives the eccentric shaft 2-11 and the eccentric output member 2-13 to rotate around the second rotation axis z2, the latch rod 2-10 is disengaged from the latch slot 2-13-2, and the eccentric output member 2-13 rotates freely around the third rotation axis z3.

[0054] The principle of the gear transmission mechanism changing from high-speed output mode to low-speed output mode: See the attached Figure 4 , rotate the speed knob 3-1 by 180°, during which the eccentric lever 3-1-1 pushes the shift fork 3-2 to drive the secondary driven gear 2-8 to move downward along the spline groove 2-6b of the output shaft, and the ratchet block 2-7a on the lower end surface of the primary driven gear 2-7 is gradually pulled out from the groove 2-8a on the upper end surface of the secondary driven gear 2-8, so that the primary driven gear 2-7 and the secondary driven gear 2-8 are separated, and the secondary driven gear 2-8 is meshed with the secondary transmission gear 2-5 (see attached Figure 3 ), realizing the clutch function, at this time, the motor shaft 1-3 of the motor 1-2 drives the second bevel gear 2-3 to rotate through the first bevel gear 1-5, so that the first-stage transmission gear 2-4 drives the first-stage driven gear 2-7 to rotate freely on the smooth section 2-6a of the output shaft 2-6, and at the same time, the second-stage transmission gear 2-5 drives the output shaft 2-6 to rotate around the second rotation axis z2 through the second-stage driven gear 2-8, and the latch rod 2-10 engages with the latch slot 2-13-2, forcing the eccentric output member 2-13 to revolve around the second rotation axis z2.

[0055] Example 2

[0056] like Figure 1 , 2 As shown in Figures 1 and 12, the utility model is a dual-mode eccentric polishing machine, comprising a handle 1, a machine head 2 and a polishing base plate 4, wherein the handle 1 has a motor 1-2, the machine head 2 has the electric polishing tool mode switching mechanism with a clutch function described in Example 1, the motor shaft 1-3 of the motor 1-2 is transmission-connected to the input end of the gear speed change mechanism, and the polishing base plate 4 is fixedly mounted on the eccentric output member 2-13;

[0057] When the gear speed change mechanism is in high-speed output mode, the motor 1-2 drives the polishing base plate 4 to revolve around the second rotation axis z2 through the gear speed change mechanism, and freely rotate around the third rotation axis z3;

[0058] When the gear speed change mechanism is in the low-speed output mode, the motor 1 - 2 drives the polishing base plate 4 to revolve around the second rotation axis z2 through the gear speed change mechanism.

[0059] Specifically, the handle 1 includes a handle housing 1-1, in which a motor 1-2 and a control element are installed, the axis of the motor shaft 1-3 of the motor 1-2 is perpendicular to the 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 heat dissipation inside the handle 1, a cooling fan 1-6 is also provided on the motor shaft 1-3, and the motor 1-2 is quickly cooled as it runs.

[0060] Preferably, the output end of the motor shaft 1-3 and the input end of the gear change mechanism are connected by a bevel gear set. Specifically, a first bevel gear 1-5 is provided at the end of the motor shaft 1-3, and a second bevel gear 2-3 is installed on the upper part of the intermediate transmission shaft 2-2. The first bevel gear 1-5 is meshed with the second bevel gear 2-3. The motor 1-2 drives the intermediate transmission shaft 2-2 to rotate through the bevel gear set, and drives the output shaft 2-6 to rotate after gear speed change, and then drives the polishing base plate 4 to move through the eccentric shaft 2-11 and the eccentric output member 2-13. The polishing base plate 4 and the eccentric output member 2-13 can be fixedly connected by screws; a head cover 5 is provided on the upper part of the head 2, and a dust cover 6 is provided on the bottom of the head 2, which is arranged above the outer peripheral side of the polishing base plate 4. The upper end of the dust cover 6 is butt-connected with the lower end of the head cover 5, and a dust suction port 6-1 is provided on the dust cover 6, and the dust suction port 6-1 is externally connected to a dust suction pipe 7.

[0061] In order to facilitate the operation of the eccentric polisher, handle holes 2 - 1 a are provided on the left and right sides of the transmission housing 2 - 1 of the machine head 2 , and an auxiliary handle can be installed on the left or right side of the machine head 2 .

[0062] As for other specific structures and working principles not described in the eccentric polishing machine, they are similar to the prior art and will not be described in detail here.

[0063] The utility model discloses an electric polishing tool mode switching mechanism with a clutch function and a dual-mode eccentric polishing machine. The primary driven gear and the secondary driven gear are designed as a split structure, and the mode selection mechanism drives the secondary driven gear to move axially up and down on the spline groove of the output shaft to achieve switching between a high-speed output mode and a low-speed output mode. Compared with the double gears of the traditional one-piece structure design, the utility model effectively avoids problems such as jamming and gear knocking during the mode switching operation, improves the convenience of the mode switching operation of the electric polishing tool, and improves the stability and reliability of use, which helps to extend the service life of the mode switching mechanism of the electric polishing tool. During the high-speed and low-speed output mode switching process of the electric polishing tool mode switching mechanism, the primary driven gear and the secondary driven gear are plug-in and fitted or disengaged through the ratchet block and the groove, which is convenient and efficient to operate, even if the mode switching mechanism of the electric polishing tool has a clutch function. The overall structural design is simple, the preparation and implementation feasibility is high, and the practicability is strong.

[0064] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An electric polishing tool mode switching mechanism with a clutch function, comprising a gear speed change mechanism, a latch rod (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, an output end of the gear speed change mechanism is transmission-connected with the eccentric shaft (2-11) for driving the eccentric shaft (2-11) to rotate around the second rotation axis (z2), the eccentric output member (2-13) is rotationally connected with the eccentric shaft (2-11) with the third rotation axis (z3) as the rotation axis, the eccentric output member (2-13) has a plurality of latch grooves (2-13-2), and the latch rod (2-10) has a function of being connected to the latch grooves (2-13-2) in accordance with the gear speed change mechanism speed change action. 13-2) are disengaged or engaged, the gear speed change mechanism comprises a transmission housing (2-1), an intermediate transmission shaft (2-2), a primary transmission gear (2-4), a secondary transmission gear (2-5), an output shaft (2-6), a primary driven gear (2-7) and a secondary driven gear (2-8), the intermediate transmission shaft (2-2) is installed in the transmission housing (2-1) with a first rotation axis (z1) as a rotation axis, the output shaft (2-6) is installed in the transmission housing (2-1) with a second rotation axis (z2) as a rotation axis, the first rotation axis (z1) is parallel to the second rotation axis (z2), the primary transmission gear (2-4) and the secondary transmission gear (2-5) are axially installed on the intermediate transmission shaft (2-2) up and down, and is characterized in that The primary driven gear (2-7) is axially slidably mounted on the smooth section (2-6a) located on the upper side of the output shaft (2-6), and the secondary driven gear (2-8) is axially slidably mounted on the output shaft spline groove (2-6b) located on the lower side of the output shaft (2-6) through the central spline hole; one of the lower end surface of the primary driven gear (2-7) and the upper end surface of the secondary driven gear (2-8) is provided with a ratchet block (2-7a), and the other of the lower end surface of the primary driven gear (2-7) and the upper end surface of the secondary driven gear (2-8) is provided with a groove (2-8a) corresponding to the ratchet block (2-7a); the secondary driven gear (2-8) is driven by the mode selection mechanism (3) to move axially up and down on the output shaft spline groove (2-6b), wherein: When the gear speed change mechanism is in high-speed output mode, the latch rod (2-10) is disengaged from the latch groove (2-13-2), so that the eccentric output member (2-13) revolves around the second rotation axis (z2) and freely rotates around the third rotation axis (z3), the primary transmission gear (2-4) is meshed with the primary driven gear (2-7), the secondary transmission gear (2-5) is disengaged from the secondary driven gear (2-8), and the ratchet block (2-7a) and the groove (2-8a) between the lower end surface of the primary driven gear (2-7) and the upper end surface of the secondary driven gear (2-8) are correspondingly plugged and fitted; When the gear speed change mechanism is in the low-speed output mode, the latch rod (2-10) is engaged with the latch groove (2-13-2), so that the eccentric output member (2-13) revolves around the second rotation axis (z2), the primary transmission gear (2-4) is meshed with the primary driven gear (2-7), the secondary transmission gear (2-5) is meshed with the secondary driven gear (2-8), and the ratchet block (2-7a) and the groove (2-8a) between the lower end surface of the primary driven gear (2-7) and the upper end surface of the secondary driven gear (2-8) are disengaged.

2. The electric polishing tool mode switching mechanism with clutch function as claimed in claim 1, characterized in that: The primary transmission gear (2-4) and the secondary transmission gear (2-5) are both fixedly mounted on the intermediate transmission shaft (2-2); the outer diameter of the output shaft spline groove (2-6b) is greater than the outer diameter of the smooth section (2-6a); an elastic member (2-9) is provided above the primary driven gear (2-7); and an elastic member (2-9) is provided above the primary driven gear (2-7) for limiting the primary driven gear (2-7) to abut against the lower end of the smooth section (2-6a).

3. The electric polishing tool mode switching mechanism with clutch function as claimed in claim 2, characterized in that: The elastic member (2-9) is a compression spring sleeved on the upper end of the smooth section (2-6a).

4. The electric polishing tool mode switching mechanism with clutch function as claimed in claim 3, characterized in that: The lower end surface of the primary driven gear (2-7) is provided with a coaxial truncated cone (2-7b), there are two ratchet blocks (2-7a), the two ratchet blocks (2-7a) are correspondingly arranged at the two ends of the same diameter of the lower end surface of the truncated cone (2-7b), and the lower end surface of the ratchet block (2-7a) is set as a slope structure gradually extending from one end to the other end; there are two grooves (2-8a), the two grooves (2-8a) are correspondingly arranged on the upper end surface of the secondary driven gear (2-8), and the bottom of the groove (2-8a) is set as a slope structure adapted to the ratchet block (2-7a).

5. The electric polishing tool mode switching mechanism with clutch function as claimed in claim 4, characterized in that: The upper end of the latch rod (2-10) is mounted on the secondary driven gear (2-8), and the lower end passes through the latch hole (2-11-1) on the eccentric shaft (2-11) and matches with the latch groove (2-13-2) on the upper end head (2-13-1) of the eccentric output member (2-13).

6. The electric polishing tool mode switching mechanism with clutch function as claimed in claim 5, characterized in that: The lower end surface of the primary driven gear (2-7) and the upper end surface of the secondary driven gear (2-8) form a separable double gear through the ratchet block (2-7a) and the groove (2-8a).

7. The electric polishing tool mode switching mechanism with clutch function as claimed in claim 2, characterized in that: The upper end of the intermediate transmission shaft (2-2) is supported on the upper part of the transmission housing (2-1) through the transmission shaft upper bearing (2-2-1), and the lower end is supported on the lower part of the transmission housing (2-1) through the transmission shaft lower bearing (2-2-2). The upper end of the output shaft (2-6) is supported on the upper part of the transmission housing (2-1) through the output shaft upper bearing (2-6-1), and 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 the second rotation axis (z2) in the lower part of the transmission housing (2-1) through the eccentric shaft bearing (2-12). The eccentric output member (2-13) is axially rotatably supported in the eccentric shaft (2-11) around the third rotation axis (z3) through the rotation bearing (2-14).

8. The electric polishing tool mode switching mechanism with clutch function according to any one of claims 2 to 7, characterized in that: The mode selection mechanism (3) comprises a shift knob (3-1) and a shift fork (3-2); the shift fork (3-2) is slidably mounted in the transmission housing (2-1) via a guide rod (3-3) and cooperates with a secondary driven gear (2-8) to drive the secondary driven gear (2-8) to move axially up and down on an output shaft spline groove (2-6b) of an output shaft (2-6); an eccentric shift rod (3-1-1) is provided on the shift knob (3-1); a horizontal opening groove (3-2-1) is provided on one side of the shift fork (3-2); the shift knob (3-1) is axially rotatably mounted on the transmission housing (2-1), and the eccentric shift rod (3-1-1) is located in the horizontal opening groove (3-2-1); the shift knob (3-1) drives the secondary driven gear (2-8) to move axially up and down through the shift fork (3-2).

9. A dual-mode eccentric polishing machine, characterized in that: The invention comprises a handle (1), a machine head (2) and a polishing base plate (4), wherein the handle (1) has a motor (1-2), the machine head (2) has an electric polishing tool mode switching mechanism with a clutch function as claimed in any one of claims 1 to 8, the motor shaft (1-3) of the motor (1-2) is transmission-connected to the input end of the gear speed change mechanism, and the polishing base plate (4) is fixedly mounted on the 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 base plate (4) to revolve around the second rotation axis (z2) through the gear speed change mechanism, and to freely rotate around the third rotation axis (z3); When the gear speed change mechanism is in a low-speed output mode, the motor (1-2) drives the polishing base plate (4) to revolve around the second rotation axis (z2) through the gear speed change mechanism.

10. The dual-mode eccentric polishing machine according to claim 9, characterized in that: The output end of the motor shaft (1-3) is connected to the input end of the gear speed change mechanism by a bevel gear set; a head cover (5) is provided on the upper part of the head (2); a dust cover (6) is provided on the bottom of the head (2) and is arranged above the outer peripheral side of the polishing base plate (4); the upper end of the dust cover (6) is butt-connected to the lower end of the head cover (5); a dust suction port (6-1) is provided on the dust cover (6); and the dust suction port (6-1) is externally connected to a dust suction pipe (7).

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