Eccentric polishing machine with good gear shifting safety

Abstract

The utility model discloses an eccentric polishing machine with good gear shifting safety, which comprises a handle, a machine head, a mode selection mechanism and a polishing bottom plate, a motor is arranged in the handle, a gear speed change mechanism is arranged in the machine head, and a motor shaft of the motor is in transmission connection with an input end of the gear speed change mechanism. The polishing bottom plate is fixedly installed on an eccentric output piece located at the lower end of the gear speed change mechanism, the handle shell, the machine head housing and the dust cover form a shell assembly, the mode selection mechanism comprises a speed change knob and a shifting fork, and the speed change knob is rotatably installed on a speed change knob installation hole in a transmission shell located on the outer side of the machine head. The outer side end of the speed change knob penetrates through a first through hole in the shell assembly and extends to the outside of the shell assembly, the speed change knob drives the gear speed change mechanism through the shifting fork to switch between a high-speed output mode and a low-speed output mode, and the microswitch is fixedly arranged on the outer side face of the handle shell and is in signal connection with a control element on the motor. A plurality of arc-shaped grooves are formed in the peripheral side of the speed change knob, a trigger block is arranged on the microswitch, and when the gear speed change mechanism is in a high-speed output mode or in a low-speed output mode, the trigger block is embedded in one corresponding arc-shaped groove. In the high-low speed output mode switching process of the gear speed change mechanism, the rotating speed of the motor is reduced and the motor is in a low-speed running state, so that the driven gear is more easily meshed with the transmission gear in place, and the phenomena of clamping stagnation, gear tooth breaking, loud noise and the like in the mode switching operation process are effectively avoided; the use stability and reliability of the eccentric polishing machine are improved, and the service life of the eccentric polishing machine is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of electric grinding and polishing tools, in particular to an eccentric polishing machine with good gear shifting safety. 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 advantages such as simple and compact structure, but in the process of switching between high-speed mode and low-speed mode, since the motor always maintains a high speed state, the first-stage driven gear on the double gear and the first-stage transmission gear meshing process or the second-stage driven gear on the double gear and the second-stage transmission gear meshing process is prone to jamming, gear tooth knocking, and high gear shifting noise, etc., which cannot be meshed in place in time, resulting in the teeth on the gears in the mode switching mechanism being easily impacted and damaged, which seriously restricts the reliability and service life of the electric polishing tool. To this end, the utility model proposes an eccentric polishing machine with good gear shifting safety, in order to solve the above technical problems. Summary of the invention

[0004] The purpose of the utility model is to overcome the defects existing in the prior art and provide an eccentric polishing machine with good gear shifting safety. A micro switch is provided on the outer peripheral side of a speed change knob, and when the gear speed change mechanism is in a high-speed output mode or the gear speed change mechanism is in a low-speed output mode, a trigger block of the micro switch is embedded in an arc-shaped groove on the outer peripheral side of the speed change knob, so that the micro switch is in a normally closed state at this time. When the high-speed and low-speed output modes of the gear speed change mechanism are switched by rotating the speed change knob, the trigger block of the micro switch is triggered during the rotation of the speed change knob, and the micro switch sends a signal to the control element of the motor. Signal, at this time the motor speed drops, when the speed knob is rotated to the specified output mode, the trigger block of the microswitch is again embedded in the corresponding arc-shaped groove on the outer peripheral side of the speed knob, so that the microswitch returns to the normally closed state, that is, in the process of switching between high and low speed output modes of the gear speed change mechanism, the motor speed drops and is in a low-speed operation state, so that the driven gear is easier to engage with the transmission gear, effectively avoiding the phenomena of sticking, gear tooth hitting, loud noise, etc. during the mode switching operation, improving the stability and reliability of the eccentric polisher, and helping to extend the service life of the eccentric polisher.

[0005] To achieve the above-mentioned purpose, the technical solution of the utility model is to design an eccentric polishing machine with good gear shifting safety, including a handle, a machine head, a mode selection mechanism and a polishing base plate, the handle is provided with a motor, the machine head is provided with a gear speed change mechanism, the motor shaft of the motor is transmission-connected to the input end of the gear speed change mechanism, the polishing base plate is fixedly mounted on the eccentric output member located at the lower end of the gear speed change mechanism, the upper outer part of the machine head is provided with a machine head cover shell, the lower outer part of the machine head is provided with a dust cover arranged above the outer peripheral side of the polishing base plate, the upper end of the dust cover is butt-connected with the lower end of the machine head cover shell, the dust cover is provided with a dust suction pipe head, one side end of the machine head cover shell is butt-connected with the handle shell outside the handle, the handle shell, the machine head cover shell and the dust cover constitute a shell assembly, the mode selection mechanism includes a speed change knob and a shift fork, and the speed change knob is rotatably mounted on the outer side of the machine head The gear shift knob is mounted on the transmission housing, and the outer end of the gear shift knob passes through a through hole on the housing assembly and extends to the outside of the housing assembly. The shift fork is slidably installed in the transmission housing through a longitudinal guide rod. The shift knob is provided with an eccentric shift rod extending into the interior of the transmission housing. One side of the shift fork is provided with a strip opening groove or a waist-shaped hole, and the eccentric shift rod is connected to the strip opening groove or the waist-shaped hole of the shift fork. The shift knob drives the gear shift mechanism to switch between a high-speed output mode and a low-speed output mode through the shift fork. It also includes a micro switch fixed on the outer surface of the transmission housing, and the micro switch is connected to the control element signal on the motor. The outer peripheral side of the gear shift knob is provided with a plurality of arc grooves, and the micro switch is provided with a trigger block. When the gear shift mechanism is in the high-speed output mode or the gear shift mechanism is in the low-speed output mode, the trigger block is embedded in a corresponding arc groove.

[0006] The utility model discloses an eccentric polishing machine with good gear shifting safety, by providing a micro switch on the outer peripheral side of a speed change knob, and when the gear speed change mechanism is in a high-speed output mode or the gear speed change mechanism is in a low-speed output mode, a trigger block of the micro switch is embedded in an arc-shaped groove on the outer peripheral side of the speed change knob, so that the micro switch is in a normally closed state at this time. When the high-speed and low-speed output modes of the gear speed change mechanism are switched by rotating the speed change knob, the trigger block of the micro switch is triggered during the rotation of the speed change knob, and the micro switch sends a signal to the control element of the motor. At this time, the motor speed drops, and when the speed change knob is rotated to the indicated position, the motor speed drops. When a certain output mode is set, the trigger block of the microswitch is again embedded in the arc-shaped groove corresponding to the outer peripheral side of the speed change knob, so that the microswitch returns to the normally closed state, that is, during the high-speed and low-speed output mode switching process of the gear speed change mechanism, the motor speed drops and is in a low-speed operation state, so that the driven gear is easier to engage with the transmission gear, effectively avoiding the phenomena of sticking, gear rattling, and loud noise during the mode switching operation, thereby improving the stability and reliability of the eccentric polishing machine and helping to extend the service life of the eccentric polishing machine; the overall structural design is simple, the preparation and implementation feasibility is high, and the practicability is strong.

[0007] The preferred technical solution is that a blind hole with an opening toward the through hole 1 is provided on the inner peripheral wall of the head housing, a spring and a marble are embedded in the blind hole, the marble is located at the opening position of the blind hole, the arc groove includes two, the two arc grooves are located at the two ends of the same diameter of the speed change knob, the blind hole and the micro switch are located at the outer peripheral side of the two ends of the same diameter of the speed change knob, when the gear speed change mechanism is in the high-speed output mode or the gear speed change mechanism is in the low-speed output mode, the trigger block is embedded in one of the arc grooves, and the marble is embedded in the other arc groove. The spring and the marble form an elastic abutment component corresponding to the micro switch, so that when the speed change knob is adjusted to the appropriate gear output mode, the elastic abutment component and the trigger block of the micro switch press the speed change knob from the two ends of the same diameter, effectively preventing the speed change knob from being accidentally touched and rotated, and further improving the safety of the eccentric polishing machine of the utility model.

[0008] A further preferred technical solution is that the inner periphery of the speed knob mounting hole is provided with an annular step eaves body that is higher outside and lower inside, the speed knob includes a circular base plate and a gripping block, the gripping block is integrally formed on the outer end face of the circular base plate, the inner end face of the circular base plate is provided with an insertion section that is plugged into the inside of the speed knob mounting hole, the outer periphery of the insertion section is provided with an annular groove, the annular step eaves body is embedded and plugged into the inside of the annular groove, the inner end face of the circular base plate is also provided with an eccentric hole located on the outer periphery, one end of the eccentric shift rod is plugged and fixed in the inside of the eccentric hole, and the other end is plugged into the strip-shaped opening groove or waist-shaped hole of the shift fork, and the arc-shaped groove is located on the outer periphery of the circular base plate. The speed knob is simple to install on the speed knob mounting hole of the transmission housing, and the two have good rotational adaptability and high stability, which effectively prevents the speed knob from falling out.

[0009] A further preferred technical solution is that a groove is provided on the outer peripheral wall surface of the transmission housing and is located on the outer peripheral side of the speed change knob mounting hole, and the micro switch is embedded and fixed in the groove.

[0010] A further preferred technical solution is that a screw hole is provided at the bottom of the groove, a mounting hole is provided on the micro switch, and the micro switch is fixedly connected to the screw hole by a screw passing through the mounting hole. The fixing and mounting method of the micro switch on the transmission housing is simple, ensuring that the eccentric polishing machine of the utility model can be smoothly prepared and implemented.

[0011] A further preferred technical solution is that a gear indicating arrow located on the outer peripheral side of the through hole is provided on the outer wall of the head cover, and a gear mark is provided on the outer surface of the grip block, and when the gear speed change mechanism is in the high-speed output mode or the gear speed change mechanism is in the low-speed output mode, the gear indicating arrow corresponds to the corresponding gear mark. The gear indicating arrow corresponds to the corresponding gear mark, which helps the operator to identify the current working output mode of the polishing machine to better match the current working condition.

[0012] A further preferred technical solution is that a latch rod, an eccentric shaft and an eccentric output member are further provided inside the machine head, the eccentric shaft has a second rotation axis and a third rotation axis which are parallel to each other, the output end of the gear speed change mechanism is drivingly 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 has a plurality of latch grooves, and the latch rod has two working modes of being disengaged from or engaged with the latch grooves in accordance with the speed change switching action of the gear speed change mechanism;

[0013] 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 is installed in the transmission housing with a first rotation axis as a rotation axis, and the output shaft is installed in the transmission housing with a second rotation axis as a rotation axis. The first rotation axis is parallel to the second rotation axis. The primary transmission gear and the secondary transmission gear are axially installed up and down on the intermediate transmission shaft. The primary driven gear is axially slidably installed up and down on the smooth section located on the upper side of the output shaft. The secondary 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 spline hole in the center. A plug-in buckle assembly that matches each other is provided between the lower end face of the primary driven gear and the upper end face of the secondary driven gear. The speed change knob drives the secondary driven gear to move axially up and down on the output shaft spline groove on the lower side of the output shaft through the shift fork.

[0014] When the gear speed change mechanism is in high-speed output mode, the latch rod is disengaged from the latch groove on the eccentric output member, so that the eccentric output member revolves around the second rotation axis and freely rotates 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 lower end face of the primary driven gear and the upper end face of the secondary driven gear are plug-in-and-snap-connected together through the plug-in and snap-fit ​​assembly;

[0015] When the gear speed change mechanism is in the low-speed output mode, the latch rod is engaged with the latch groove on the eccentric output member, so that the eccentric output member revolves 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 primary driven gear and the secondary driven gear are disengaged. The internal structure design of the polishing machine of the utility model is ingenious and reasonable, compact, and small in overall size, ensuring the convenience of use of the eccentric polishing machine.

[0016] A further preferred technical solution is that the plug-in and snap-fit ​​assembly includes a ratchet block and a slot that are adapted to each other, the ratchet block is located on one of the lower end surface of the primary driven gear and the upper end surface of the secondary driven gear, and the slot is located on the other of the lower end surface of the primary driven gear and the upper end surface of the secondary driven gear. The plug-in adaptability between the ratchet block and the slot is good, ensuring high efficiency when the primary driven gear and the secondary driven gear are snap-fitted or disconnected.

[0017] A further preferred technical solution is that a handle mounting hole column is provided on the outer side of the transmission housing, a second through hole is provided on the machine head cover, and the handle mounting hole column extends through the second through hole to the outside of the machine head cover.

[0018] A further preferred technical solution is that a dust suction pipe is plugged and fixedly installed on the dust suction pipe head.

[0019] The advantages and beneficial effects of the utility model are:

[0020] 1. The utility model is an eccentric polishing machine with good gear shifting safety. A micro switch is arranged on the outer peripheral side of a speed change knob. When the gear speed change mechanism is in a high-speed output mode or a low-speed output mode, a trigger block of the micro switch is embedded in an arc-shaped groove on the outer peripheral side of the speed change knob, so that the micro switch is in a normally closed state at this time. When the high-speed and low-speed output modes of the gear speed change mechanism are switched by rotating the speed change knob, the trigger block of the micro switch is triggered during the rotation of the speed change knob. The micro switch sends a signal to the control element of the motor. At this time, the motor speed decreases. When the speed change knob is rotated to When the output mode is specified, the trigger block of the microswitch is again embedded in the arc-shaped groove corresponding to the outer side of the speed change knob, so that the microswitch returns to the normally closed state, that is, during the switching process of the high-speed and low-speed output modes of the gear speed change mechanism, the motor speed drops and is in a low-speed operation state, so that the driven gear is easier to engage with the transmission gear, effectively avoiding the phenomena of jamming, gear rattling, loud noise, etc. during the mode switching operation, improving the stability and reliability of the eccentric polishing machine, and helping to extend the service life of the eccentric polishing machine; the overall structural design is simple, the preparation and implementation feasibility is high, and the practicability is strong.

[0021] 2. The spring and the marble form an elastic abutment component corresponding to the micro switch, so that when the speed knob is adjusted to a suitable gear output mode, the elastic abutment component and the trigger block of the micro switch press the speed knob from both ends of the same diameter, effectively preventing the speed knob from being accidentally rotated, and further improving the safety of the eccentric polishing machine of the utility model.

[0022] 3. The gear indicator arrow corresponds to the corresponding gear mark, which helps the operator to identify the current working output mode of the polishing machine to better match the current working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a three-dimensional structural schematic diagram of an eccentric polishing machine with good shifting safety in the utility model;

[0024] Figure 2 It is a longitudinal sectional view of an eccentric polishing machine with good shifting safety along the center line of the motor shaft of the utility model;

[0025] Figure 3 yes Figure 2 A partial enlarged view of the mode selection mechanism at H in the middle;

[0026] Figure 4This is a three-dimensional structural diagram of an eccentric polishing machine with good shifting safety (without the machine head cover and dust cover);

[0027] Figure 5 yes Figure 4 A partial enlarged view of the S in the middle;

[0028] Figure 6 It is a schematic diagram of the installation structure of the speed change knob on the transmission housing;

[0029] Figure 7 It is a schematic diagram of the assembly structure of the nose cover and the dust cover.

[0030] In the figure: 1. handle; 2. machine head; 3. mode selection mechanism; 4. polishing bottom plate; 5. machine head cover; 6. dust cover; 7. micro switch; 8. dust suction tube; 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; 2-1. transmission housing; 2-1a. groove; 2-1b. screw hole; 2-1c. handle mounting hole column; 2-2. intermediate transmission shaft; 2-3. second bevel gear; 2-4. primary transmission gear; 2-5. secondary transmission gear; 2-6. output shaft; 2-7. primary driven gear; 2-8. secondary driven gear; 2-9. latch rod; 2-10. eccentric shaft; 2-11. eccentric Output member; 3-1, speed knob; 3-1a, circular base plate; 3-1a-1, arc groove; 3-1a-2, eccentric hole; 3-1b, grip block; 3-1b-1, gear mark; 3-1c, eccentric lever; 3-1d, plug-in section; 3-1d-1, annular groove; 3-2, shift fork; 3-2a, strip opening groove or waist-shaped hole; 5-1, blind hole; 5-2, spring; 5-3, marble; 5-4, gear indication arrow; 6-1, dust suction pipe head; 7-1, trigger block; 7-2, mounting hole; A, speed knob mounting hole; A-1, annular step eaves; B, through hole one; C, through hole two; z1, first rotation axis; z2, second rotation axis; z3, third rotation axis. DETAILED DESCRIPTION

[0031] 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.

[0032] Example

[0033] like Figures 1 to 7As shown, the utility model is an eccentric polishing machine with good gear shifting safety, comprising a handle 1, a machine head 2, a mode selection mechanism 3 and a polishing base plate 4, wherein the handle 1 has a motor 1-2, the machine head 2 has a gear speed change mechanism inside, the motor shaft 1-3 of the motor 1-2 is transmission-connected to the input end of the gear speed change mechanism, the polishing base plate 4 is fixedly mounted on an eccentric output member 2-11 at the lower end of the gear speed change mechanism, the upper outer portion of the machine head 2 is provided with a machine head cover 5, the lower outer portion of the machine head 2 is provided with a cover arranged on the polishing A dust cover 6 is provided on the upper peripheral side of the light bottom plate 4, the upper end of the dust cover 6 is docked with the lower end of the machine head cover 5, a dust suction pipe head 6-1 is provided on the dust cover 6, one side end of the machine head cover 5 is docked with the handle shell 1-1 outside the handle 1, the handle shell 1-1, the machine head cover 5 and the dust cover 6 constitute a shell assembly, the mode selection mechanism 3 includes a speed knob 3-1 and a shift fork 3-2, the speed knob 3-1 is rotatably mounted on the speed knob mounting hole A on the transmission shell 2-1 outside the machine head 2 The outer end of the speed change knob 3-1 passes through the through hole 1B on the housing assembly and extends to the outside of the housing assembly. The shift fork 3-2 is installed in the transmission housing 2-1 by sliding up and down through the longitudinal guide rod. The speed change knob 3-1 is provided with an eccentric shift rod 3-1c extending to the inside of the transmission housing 2-1. One side of the shift fork 3-2 is provided with a strip opening groove or a waist-shaped hole 3-2a, and the eccentric shift rod 3-1c is connected to the strip opening groove or the waist-shaped hole 3-2a of the shift fork 3-2. The speed change knob 3-1 drives the gear speed change mechanism through the shift fork 3-2. The micro switch 7 is fixed on the outer surface of the transmission housing 2-1, and the micro switch 7 is connected with the control element signal on the motor 1-2. The outer peripheral side of the speed change knob 3-1 is provided with a plurality of arc grooves 3-1a-1. The micro switch 7 is provided with a trigger block 7-1. When the gear speed change mechanism is in the high-speed output mode or the gear speed change mechanism is in the low-speed output mode, the trigger block 7-1 is embedded in a corresponding arc groove 3-1a-1.

[0034] Preferably, a blind hole 5-1 with an opening toward the through hole 1B is provided on the inner wall surface of the head cover 5, a spring 5-2 and a marble 5-3 are embedded in the blind hole 5-1, the marble 5-3 is located at the opening position of the blind hole 5-1, the arc groove 3-1a-1 includes two, the two arc grooves 3-1a-1 are correspondingly located at the two ends of the same diameter of the speed change knob 3-1, the blind hole 5-1 and the micro switch 7 are correspondingly located on the outer peripheral side of the two ends of the same diameter of the speed change knob 3-1, when the gear speed change mechanism is in the high-speed output mode or the gear speed change mechanism is in the low-speed output mode, the trigger block 7-1 is embedded in one of the arc grooves 3-1a-1, and the marble 5-3 is embedded in the other arc groove 3-1a-1.

[0035] Further preferably, the inner periphery of the speed knob mounting hole A is provided with an annular step eaves A-1 which is higher outside and lower inside, the speed knob 3-1 comprises a circular base plate 3-1a and a gripping block 3-1b, the gripping block 3-1b is integrally formed on the outer end surface of the circular base plate 3-1a, the inner end surface of the circular base plate 3-1a is provided with an inserting section 3-1d which is inserted into the inside of the speed knob mounting hole A, and the outer periphery of the inserting section 3-1d is provided with an annular groove 3-1d-1, The annular step eaves A-1 is embedded and inserted into the annular groove 3-1d-1, and the inner end face of the circular substrate 3-1a is also provided with an eccentric hole 3-1a-2 located on the outer peripheral side. One end of the eccentric shift rod 3-1c is inserted and fixed in the eccentric hole 3-1a-2, and the other end is inserted in the strip-shaped opening groove or the waist-shaped hole 3-2a of the shift fork 3-2. The arc-shaped groove 3-1a-1 is located on the outer peripheral side edge of the circular substrate 3-1a.

[0036] Further preferably, a groove 2-1a is provided on the outer peripheral wall surface of the transmission housing 2-1 and is located on the outer peripheral side of the speed change knob mounting hole A, and the micro switch 7 is embedded and fixed inside the groove 2-1a.

[0037] Further preferably, a screw hole 2-1b is provided at the bottom of the groove 2-1a, a mounting hole 7-2 is provided on the micro switch 7, and the micro switch 7 is screwed and fixedly connected to the screw hole 2-1b by a screw passing through the inside of the mounting hole 7-2.

[0038] Further preferably, the outer wall surface of the head cover 5 is provided with a gear indication arrow 5-4 located on the outer peripheral side of the through hole 1B, and the outer surface of the grip block 3-1b is provided with a gear mark 3-1b-1, and when the gear speed change mechanism is in the high-speed output mode or the gear speed change mechanism is in the low-speed output mode, the gear indication arrow 5-4 corresponds to the corresponding gear mark 3-1b-1.

[0039] Further preferably, the machine head 2 is further provided with a latch rod 2-9, an eccentric shaft 2-10 and an eccentric output member 2-11, the eccentric shaft 2-10 has a second rotation axis z2 and a third rotation axis z3 which are parallel to each other, the output end of the gear speed change mechanism is transmission-connected with the eccentric shaft 2-10, and is used to drive the eccentric shaft 2-10 to rotate around the second rotation axis z2, the eccentric output member 2-11 is rotationally connected with the eccentric shaft 2-10 with the third rotation axis z3 as the rotation axis, the eccentric output member 2-11 has a plurality of latch grooves, and the latch rod 2-9 has two working modes of being disengaged from or engaged with the latch grooves in accordance with the speed change switching action of the gear speed change mechanism;

[0040] 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 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 The first driven gear 2-7 is axially slidably installed on the smooth section on the upper side of the output shaft 2-6, and the second driven gear 2-8 is axially slidably installed on the output shaft spline groove on the lower side of the output shaft 2-6 through the spline hole in the center. A mutually adapted plug-in and buckling assembly is provided between the lower end face of the first driven gear 2-7 and the upper end face of the second driven gear 2-8. The speed change knob 3-1 drives the second driven gear 2-8 to move axially up and down on the output shaft spline groove on the lower side of the output shaft 2-6 through the shift fork 3-2;

[0041] When the gear speed change mechanism is in high-speed output mode, the latch rod 2-9 is disengaged from the latch groove on the eccentric output member 2-11, so that the eccentric output member 2-11 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 lower end face of the primary driven gear 2-7 and the upper end face of the secondary driven gear 2-8 are plug-in-and-snap-in connected together through the plug-in and snap-fit ​​assembly;

[0042] When the gear speed change mechanism is in the low-speed output mode, the latch rod 2-9 engages with the latch groove on the eccentric output member 2-11, causing the eccentric output member 2-11 to revolve around the second rotation axis z2, and the first-stage transmission gear 2-4 engages with the first-stage driven gear 2-7, the second-stage transmission gear 2-5 engages with the second-stage driven gear 2-8, and the first-stage driven gear 2-7 and the second-stage driven gear 2-8 are disengaged.

[0043] Further preferably, the plug-in snap-fit ​​assembly includes a ratchet block and a slot that fit together, the ratchet block being located on 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, and the slot being located on 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.

[0044] Further preferably, a handle mounting hole column 2-1c is provided on the outer side of the transmission housing 2-1, and a through hole 2-C is provided on the head cover 5, and the handle mounting hole column 2-1c extends through the through hole 2-C to the outside of the head cover 5.

[0045] Further preferably, a dust suction pipe 8 is plugged and fixedly installed on the dust suction pipe head 6 - 1 .

[0046] Further 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 upper bearing of the transmission shaft, and the lower end is supported on the lower part of the transmission housing 2-1 through the lower bearing of the transmission shaft. The upper end of the output shaft 2-6 is supported on the upper part of the transmission housing 2-1 through the upper bearing of the output shaft, and the lower end cooperates with the shaft hole of the eccentric shaft 2-10. The eccentric shaft 2-10 is axially rotated and supported in the lower part of the transmission housing 2-1 through the eccentric shaft bearing around the second rotation axis z2, and the eccentric output member 2-11 is axially rotated and supported in the eccentric shaft 2-10 through the rotation bearing around the third rotation axis z3.

[0047] 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.

[0048] Specifically, 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. 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 2-10 and the eccentric output member 2-11. The polishing base plate 4 and the eccentric output member 2-11 can be fixedly connected by screws.

[0049] In order to facilitate the operation of the eccentric polisher, auxiliary handles are installed on the handle mounting hole columns 2-1c on the left and right sides of the transmission housing 2-1 of the machine head 2.

[0050] 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.

[0051] The utility model discloses a high-speed and low-speed output mode switching principle of an eccentric polishing machine with good shifting safety:

[0052] The principle of the gear transmission mechanism changing from low-speed output mode to high-speed output mode: The initial state is low-speed output mode (see Appendix Figure 2 ), hold the holding block 3-1b with your hand to rotate the circular base plate 3-1a of the speed knob 3-1 by 180°, during which the eccentric lever 3-1c pushes the shift fork 3-2 to drive the secondary driven gear 2-8 to move upward along the output shaft spline groove on the lower side of the output shaft 2-6, and the ratchet block on the lower end surface of the primary driven gear 2-7 is gradually inserted into the slot 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 assembled into a double gear. At this time, the electric The motor shaft 1-3 of the machine 1-2 drives the second bevel gear 2-3 at the upper end of the output shaft 2-6 to rotate via the first bevel gear 1-5, so that the first-stage transmission gear 2-4 drives the second-stage driven gear 2-8 and the output shaft 2-6 to rotate via the first-stage driven gear 2-7, and the output shaft 2-6 drives the eccentric shaft 2-10 and the eccentric output member 2-11 to rotate around the second rotation axis z2, the latch rod 2-9 is disengaged from the latch slot, and the eccentric output member 2-11 rotates freely around the third rotation axis z3.

[0053] The principle of the gear speed change mechanism changing from the high-speed output mode to the low-speed output mode: the initial state is the high-speed output mode. Hold the holding block 3-1b with your hand to rotate the circular base plate 3-1a of the speed change knob 3-1 by 180°. During this period, the eccentric lever 3-1c pushes the shift fork 3-2 to drive the secondary driven gear 2-8 to move downward along the output shaft spline groove on the lower side of the output shaft 2-6. The ratchet block on the lower end face of the primary driven gear 2-7 is gradually pulled out from the slot on the upper end face of the secondary driven gear 2-8 to separate the primary driven gear 2-7 and the secondary driven gear 2-8. The secondary driven gear 2-8 is meshed with the secondary transmission gear 2-5 to realize 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 transmission gear 2-4 drives the first driven gear 2-7 to rotate freely on the smooth section on the upper side of the output shaft 2-6. At the same time, the secondary transmission gear 2-5 drives the output shaft 2-6 to rotate around the second rotation axis z2 through the secondary driven gear 2-8, and the latch rod 2-9 engages with the latch groove, forcing the eccentric output member 2-11 to revolve around the second rotation axis z2.

[0054] The utility model discloses an eccentric polishing machine with good gear shifting safety, by providing a micro switch on the outer peripheral side of a speed change knob, and when the gear speed change mechanism is in a high-speed output mode or the gear speed change mechanism is in a low-speed output mode, a trigger block of the micro switch is embedded in an arc-shaped groove on the outer peripheral side of the speed change knob, so that the micro switch is in a normally closed state at this time. When the high-speed and low-speed output modes of the gear speed change mechanism are switched by rotating the speed change knob, the trigger block of the micro switch is triggered during the rotation of the speed change knob, and the micro switch sends a signal to the control element of the motor. At this time, the motor speed drops, and when the speed change knob is rotated to the indicated position, the motor speed drops. When a certain output mode is set, the trigger block of the microswitch is again embedded in the arc-shaped groove corresponding to the outer peripheral side of the speed change knob, so that the microswitch returns to the normally closed state, that is, during the high-speed and low-speed output mode switching process of the gear speed change mechanism, the motor speed drops and is in a low-speed operation state, so that the driven gear is easier to engage with the transmission gear, effectively avoiding the phenomena of sticking, gear rattling, and loud noise during the mode switching operation, thereby improving the stability and reliability of the eccentric polishing machine and helping to extend the service life of the eccentric polishing machine; the overall structural design is simple, the preparation and implementation feasibility is high, and the practicability is strong.

[0055] 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 eccentric polishing machine with good gear shifting safety, comprising a handle (1), a machine head (2), a mode selection mechanism (3) and a polishing base plate (4), wherein the handle (1) has a motor (1-2), the machine head (2) has a gear speed change mechanism inside, 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 an eccentric output member (2-11) located at the lower end of the gear speed change mechanism, The upper outer part of the machine head (2) is provided with a machine head cover shell (5), the lower outer part of the machine head (2) is provided with a dust cover (6) 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 machine head cover shell (5), the dust cover (6) is provided with a dust suction pipe head (6-1), one side end of the machine head cover shell (5) is butt-connected with the handle shell (1-1) outside the handle (1), the handle shell (1-1), the machine head cover shell (5) and the dust cover (6) constitutes a housing assembly, the mode selection mechanism (3) comprises a speed knob (3-1) and a shift fork (3-2), the speed knob (3-1) is rotatably mounted on a speed knob mounting hole (A) on a transmission housing (2-1) located outside the machine head (2), and the outer end of the speed knob (3-1) passes through a through hole (B) on the housing assembly and extends to the outside of the housing assembly, and the shift fork (3-2) is mounted on the transmission housing (2-1) by sliding up and down through a longitudinal guide rod. The shift knob (3-1) is provided with an eccentric lever (3-1c) extending into the interior of the transmission housing (2-1); one side of the shift fork (3-2) is provided with a strip-shaped opening groove or a waist-shaped hole (3-2a), and the eccentric lever (3-1c) is inserted into the strip-shaped opening groove or the waist-shaped hole (3-2a) of the shift fork (3-2); the shift knob (3-1) drives the gear shift mechanism to switch between a high-speed output mode and a low-speed output mode through the shift fork (3-2), and is characterized in that: It also includes a micro switch (7) fixedly mounted on the outer surface of the transmission housing (2-1), the micro switch (7) being connected to the control element signal on the motor (1-2), a plurality of arc-shaped grooves (3-1a-1) being arranged on the outer peripheral side of the speed change knob (3-1), a trigger block (7-1) being arranged on the micro switch (7), and when the gear speed change mechanism is in a high-speed output mode or a low-speed output mode, the trigger block (7-1) is embedded in a corresponding arc-shaped groove (3-1a-1).

2. The eccentric polishing machine with good shifting safety as claimed in claim 1, characterized in that: A blind hole (5-1) is provided on the inner wall surface of the head cover (5) with its opening facing the through hole 1 (B). A spring (5-2) and a marble (5-3) are embedded in the blind hole (5-1). The marble (5-3) is located at the opening position of the blind hole (5-1). The arc groove (3-1a-1) includes two arc grooves (3-1a-1). The two arc grooves (3-1a-1) are correspondingly located at two ends of the same diameter of the speed change knob (3-1). The blind hole (5-1) and the micro switch (7) are correspondingly located on the outer peripheral side of two ends of the same diameter of the speed change knob (3-1). When the gear speed change mechanism is in the high-speed output mode or the gear speed change mechanism is in the low-speed output mode, the trigger block (7-1) is embedded in one of the arc grooves (3-1a-1), and the marble (5-3) is embedded in the other arc groove (3-1a-1).

3. The eccentric polishing machine with good shifting safety as claimed in claim 2, characterized in that: The inner periphery of the speed knob mounting hole (A) is provided with an annular step eaves (A-1) which is higher on the outside and lower on the inside. The speed knob (3-1) comprises a circular base plate (3-1a) and a gripping block (3-1b). The gripping block (3-1b) is integrally formed on the outer end surface of the circular base plate (3-1a). The inner end surface of the circular base plate (3-1a) is provided with an inserting section (3-1d) which is inserted into the inside of the speed knob mounting hole (A). The outer periphery of the inserting section (3-1d) is provided with an annular groove (3-1d-1). The annular step eaves (A-1) is inserted and plugged into the annular groove (3-1d-1), the inner end surface of the circular base plate (3-1a) is also provided with an eccentric hole (3-1a-2) located on the outer peripheral side, one end of the eccentric shift rod (3-1c) is inserted and fixed in the eccentric hole (3-1a-2), and the other end is inserted into the strip opening groove or waist-shaped hole (3-2a) of the shift fork (3-2), and the arc-shaped groove (3-1a-1) is located on the outer peripheral side edge of the circular base plate (3-1a).

4. The eccentric polishing machine with good shifting safety as claimed in claim 3, characterized in that: The outer wall surface of the transmission housing (2-1) is provided with a groove (2-1a) located on the outer peripheral side of the speed change knob mounting hole (A), and the micro switch (7) is embedded and fixed inside the groove (2-1a).

5. The eccentric polishing machine with good shifting safety as claimed in claim 4, characterized in that: A screw hole (2-1b) is provided at the bottom of the groove (2-1a), a mounting hole (7-2) is provided on the micro switch (7), and the micro switch (7) is screwed and fixedly connected to the screw hole (2-1b) by a screw passing through the mounting hole (7-2).

6. The eccentric polishing machine with good shifting safety as claimed in claim 5, characterized in that: The outer wall surface of the head cover (5) is provided with a gear indication arrow (5-4) located on the outer peripheral side of the through hole 1 (B), and the outer surface of the grip block (3-1b) is provided with a gear mark (3-1b-1). When the gear speed change mechanism is in the high-speed output mode or the gear speed change mechanism is in the low-speed output mode, the gear indication arrow (5-4) corresponds to the corresponding gear mark (3-1b-1).

7. The eccentric polishing machine with good shifting safety as claimed in claim 6, characterized in that: The machine head (2) is also provided with a latch rod (2-9), an eccentric shaft (2-10) and an eccentric output member (2-11). The eccentric shaft (2-10) has a second rotation axis (z2) and a third rotation axis (z3) which are parallel to each other. The output end of the gear speed change mechanism is connected to the eccentric shaft (2-10) in a transmission manner so as to drive the eccentric shaft (2-10) to rotate around the second rotation axis (z2). The eccentric output member (2-11) is connected to the eccentric shaft (2-10) in a rotational manner with the third rotation axis (z3) as the rotation axis. The eccentric output member (2-11) has a plurality of latch grooves. The latch rod (2-9) has two working modes: disengaging from or engaging with the latch grooves in accordance with the gear speed change mechanism speed change switching action. 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), wherein the intermediate transmission shaft (2-2) is installed in the transmission housing (2-1) with a first rotation axis (z1) as a rotation axis, and the output shaft (2-6) is installed in the transmission housing (2-1) with a second rotation axis (z2) as a rotation axis, wherein 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 (2-5) are arranged on a plurality of axes. -5) is axially mounted on the intermediate transmission shaft (2-2) vertically, the primary driven gear (2-7) is axially mounted on the smooth section located on the upper side of the output shaft (2-6) by sliding upward and downward, the secondary driven gear (2-8) is axially mounted on the output shaft spline groove located on the lower side of the output shaft (2-6) by sliding upward and downward through the central spline hole, a mutually matching plug-in and buckling assembly is provided between the lower end surface of the primary driven gear (2-7) and the upper end surface of the secondary driven gear (2-8), and the speed change knob (3-1) drives the secondary driven gear (2-8) to move axially up and down on the output shaft spline groove on the lower side of the output shaft (2-6) through the shift fork (3-2); When the gear speed change mechanism is in high-speed output mode, the latch rod (2-9) is disengaged from the latch groove on the eccentric output member (2-11), so that the eccentric output member (2-11) 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 lower end surface of the primary driven gear (2-7) and the upper end surface of the secondary driven gear (2-8) are plug-engaged and connected together through the plug-in and snap-fit ​​assembly; When the gear speed change mechanism is in the low-speed output mode, the latch rod (2-9) engages with the latch groove on the eccentric output member (2-11), causing the eccentric output member (2-11) to revolve around the second rotation axis (z2), the primary transmission gear (2-4) meshes with the primary driven gear (2-7), the secondary transmission gear (2-5) meshes with the secondary driven gear (2-8), and the primary driven gear (2-7) and the secondary driven gear (2-8) are disengaged.

8. The eccentric polishing machine with good shifting safety as claimed in claim 7, characterized in that: The plug-in snap-fit ​​assembly comprises a ratchet block and a slot that are adapted to each other, wherein the ratchet block is located on 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), and the slot is located on 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).

9. The eccentric polishing machine with good shifting safety as claimed in claim 8, characterized in that: A handle mounting hole column (2-1c) is provided on the outer side of the transmission housing (2-1), and a through hole 2 (C) is provided on the head cover (5). The handle mounting hole column (2-1c) passes through the through hole 2 (C) and extends to the outside of the head cover (5).

10. The eccentric polishing machine with good shifting safety as claimed in claim 9, characterized in that: A dust suction pipe (8) is plugged and fixedly installed on the dust suction pipe head (6-1).

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