CN116690327A - Overload protection transmission mechanism and polisher - Google Patents

Overload protection transmission mechanism and polisher Download PDF

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Publication number
CN116690327A
CN116690327A CN202210179041.6A CN202210179041A CN116690327A CN 116690327 A CN116690327 A CN 116690327A CN 202210179041 A CN202210179041 A CN 202210179041A CN 116690327 A CN116690327 A CN 116690327A
Authority
CN
China
Prior art keywords
rotating shaft
transmission assembly
overload protection
annular groove
clamping groove
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210179041.6A
Other languages
Chinese (zh)
Inventor
柳德平
姜盛坤
吕军军
刘士伟
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guangdong Bozhilin Robot Co Ltd
Original Assignee
Guangdong Bozhilin Robot Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Guangdong Bozhilin Robot Co Ltd filed Critical Guangdong Bozhilin Robot Co Ltd
Priority to CN202210179041.6A priority Critical patent/CN116690327A/en
Publication of CN116690327A publication Critical patent/CN116690327A/en
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B7/00—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
    • B24B7/10—Single-purpose machines or devices
    • B24B7/18—Single-purpose machines or devices for grinding floorings, walls, ceilings or the like
    • B24B7/186—Single-purpose machines or devices for grinding floorings, walls, ceilings or the like with disc-type tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/04—Headstocks; Working-spindles; Features relating thereto
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B47/00—Drives or gearings; Equipment therefor
    • B24B47/10—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces
    • B24B47/12—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces by mechanical gearing or electric power
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B47/00—Drives or gearings; Equipment therefor
    • B24B47/26—Accessories, e.g. stops
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B7/00—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
    • B24B7/10—Single-purpose machines or devices
    • B24B7/18—Single-purpose machines or devices for grinding floorings, walls, ceilings or the like
    • B24B7/182—Single-purpose machines or devices for grinding floorings, walls, ceilings or the like for walls and ceilings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
    • H02K7/108—Structural association with clutches, brakes, gears, pulleys or mechanical starters with friction clutches
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Transmission Devices (AREA)

Abstract

The application relates to an overload protection transmission mechanism and a polisher. The overload protection transmission mechanism comprises: a first rotating shaft; the second rotating shaft is coaxial with the first rotating shaft and can be arranged in a relative rotating manner, an annular groove and a clamping groove which are recessed along the radial direction of the second rotating shaft are formed in the peripheral surface of the second rotating shaft, and the annular groove extends along the circumferential direction of the second rotating shaft and passes through the clamping groove; the transmission assembly is arranged on the first rotating shaft, one end of the transmission assembly can radially stretch and retract relative to the first rotating shaft and is provided with a first position and a second position matched with the second rotating shaft, one end of the transmission assembly is matched with the clamping groove to transmit torque when in the first position, one end of the transmission assembly is matched with the annular groove when in the second position, and the transmission assembly is configured to be pushed to the second position by the first position when the torque reaches a set value. The overload protection transmission mechanism provided by the application not only can avoid overload damage, but also does not need overload shutdown, and has higher working efficiency and higher safety.

Description

Overload protection transmission mechanism and polisher
Technical Field
The application relates to the technical field of polishing equipment, in particular to an overload protection transmission mechanism and a polishing machine.
Background
Polishing equipment is often needed in the building field, for example, polishing equipment is used for polishing the surfaces of concrete walls, floors and ceilings, the polishing equipment drives a polishing disc to achieve polishing through a motor, overload working conditions exist in the polishing process, the motor is easy to alarm and stop when the torque born by the motor is overlarge, the motor can be restarted after the fault problem is relieved, and the polishing efficiency is affected; moreover, overload also easily causes damage to the motor and the polishing disc.
Disclosure of Invention
The application aims to provide an overload protection transmission mechanism and a polisher so as to solve the problem of overload.
Embodiments of the present application are implemented as follows:
in a first aspect, an embodiment of the present application provides an overload protection transmission mechanism, including:
a first rotating shaft;
the second rotating shaft is coaxial with the first rotating shaft and can be arranged in a relative rotating manner, an annular groove and a clamping groove which are recessed along the radial direction of the second rotating shaft are formed in the peripheral surface of the second rotating shaft, and the annular groove extends along the circumferential direction of the second rotating shaft and passes through the clamping groove;
the transmission assembly is arranged on the first rotating shaft, one end of the transmission assembly can stretch and retract relative to the first rotating shaft along the radial direction and is provided with a first position and a second position matched with the second rotating shaft, one end of the transmission assembly is matched with the clamping groove to transmit torque when in the first position, one end of the transmission assembly is matched with the annular groove when in the second position, and the transmission assembly is configured to be pushed to the second position by the first rotating shaft when the torque reaches a set value.
In the technical scheme, when the transmission assembly is matched with the clamping groove, the first rotating shaft and the second rotating shaft transmit torque through the transmission assembly, so that the first rotating shaft and the second rotating shaft synchronously rotate; through setting up the ring channel of connecting the draw-in groove, when the overload, the moment of torsion reaches the setting value, the effort between draw-in groove and the second pivot is great, the inner wall extrusion drive assembly's of draw-in groove one end, and release drive assembly's one end from the draw-in groove, make drive assembly's one end get into the ring channel from the draw-in groove, at this moment, first pivot and second pivot skid relatively, drive assembly's one end is removed along the ring channel and is not transmitted the moment of torsion, avoid overload damage, simultaneously after the load disappears or reduces, drive assembly's one end can get back to the draw-in groove from the ring channel, the moment of torsion is transmitted once more, realize first pivot and second pivot synchronous rotation, need not to shut down because of the overload. On the other hand, when first pivot and second pivot are relative to skidding, under the cooperation of drive assembly and ring channel, restriction first pivot and second pivot are along axial separation, avoid overload to lead to first pivot and second pivot separation to lead to bigger security problem. Therefore, the overload protection transmission mechanism provided by the application not only can avoid overload damage, but also does not need overload shutdown, has higher working efficiency, and has higher safety, and the first rotating shaft and the second rotating shaft are not easy to separate along the axial direction.
In one embodiment of the present application, the depth of the annular groove is smaller than the depth of the clamping groove in the radial direction.
In the technical scheme, when overload occurs, the transmission assembly is retracted to the shallower annular groove by the deeper clamping groove under the action of the second rotating shaft, so that the first rotating shaft and the second rotating shaft slide relatively, and overload damage is effectively avoided.
In one embodiment of the application, the inner wall of the annular groove and the inner wall of the clamping groove are in smooth transition.
In the technical scheme, through the smooth transition of the inner wall of the annular groove and the inner wall of the clamping groove, one end of the transmission assembly can smoothly enter the annular groove from the clamping groove when in overload, and can return to the clamping groove from the annular groove when load is reduced, so that the matching state of the transmission assembly and the second rotating shaft can be conveniently and smoothly switched, and the reliability is improved.
In one embodiment of the present application, an inner wall of the clamping groove is a sphere.
In the technical scheme, the inner wall of the clamping groove is set to be the spherical surface, so that smooth transition between the inner wall of the clamping groove and the inner wall of the annular groove is realized, and the spherical surface has a good guiding effect, so that one end of the guiding transmission assembly is switched between the clamping groove and the annular groove.
In one embodiment of the present application, the annular groove and the clamping groove are disposed on an outer circumferential surface of the second rotating shaft; the first rotating shaft comprises a body part and a sleeve part, the sleeve part is arranged at one end of the body part, the sleeve part is sleeved on the second rotating shaft and surrounds the outer peripheral surface of the second rotating shaft, and the transmission assembly is arranged on the sleeve part.
In the above technical scheme, the sleeve part of the first rotating shaft is sleeved on the second rotating shaft, the annular groove and the clamping groove are formed in the outer peripheral surface of the second rotating shaft, the transmission assembly is arranged on the sleeve part and extends out radially towards the first rotating shaft, one end of the second rotating shaft is selectively matched with one of the annular groove and the clamping groove, synchronous rotation or slipping of the first rotating shaft and the second rotating shaft is achieved, and separation of the first rotating shaft and the second rotating shaft is avoided.
In one embodiment of the present application, the sleeve portion is formed with a through hole penetrating through a sidewall of the sleeve portion in the radial direction, the transmission assembly is disposed in the through hole, and one end of the transmission assembly passes through the through hole to be matched with the second rotating shaft.
In the technical scheme, through the arrangement of the through holes in the side wall of the sleeve part, the transmission assembly is arranged in the through holes, and the transmission assembly is convenient to replace from the outside.
In one embodiment of the application, the transmission assembly is movably disposed in the through-hole in the radial direction.
In the technical scheme, the transmission assembly can move in the through hole, so that the pressing force between the transmission assembly and the second rotating shaft is adjusted, and the transmission assembly and the second rotating shaft are stably matched.
In one embodiment of the present application, the transmission assembly includes a connection portion threadedly engaged with the through hole, an elastic portion telescopically connected to the connection portion and engaged with the second rotation shaft, and a support portion disposed between the connection portion and the support portion to urge the support portion to protrude with respect to the connection portion.
When the connecting part is screwed in more along the through hole towards the second rotating shaft, the elastic part is compressed more, the pressing force is larger, the elastic part is not easy to compress further, and the set value of the torque (namely, the critical value for switching the transmission assembly between the annular groove and the clamping groove) is larger; when the connecting portion is screwed in less along the through hole towards the second rotating shaft, the elastic portion is compressed less, the pressing force is smaller, the elastic portion is easy to be further compressed, and the set value of torque is smaller. In the technical scheme, the connecting part is in threaded fit with the through hole, the transmission assembly is installed stably, and the pressing force between the transmission assembly and the second rotating shaft can be adjusted by screwing the connecting part in or out towards the second rotating shaft, so that the set value of torque can be adjusted conveniently.
In one embodiment of the application, the transmission assembly further comprises a ball located between the support portion and the second rotating shaft, and the support portion is matched with the second rotating shaft through the ball.
In the technical scheme, the supporting part of the transmission assembly is indirectly matched with the second rotating shaft through the balls, so that the damage to structures such as the connecting part, the supporting part and the like is avoided.
In one embodiment of the application, the overload protection mechanism further comprises: and the rotating bearing is arranged between the body part and the second rotating shaft so as to connect the body part and the second rotating shaft.
In the technical scheme, the body part of the first rotating shaft is connected with the second rotating shaft through the rotating bearing, so that the first rotating shaft and the second rotating shaft are further prevented from being separated, and the connection reliability and the safety are ensured.
In a second aspect, embodiments of the present application provide a sander comprising:
a motor having an output shaft;
polishing the grinding disc;
the overload protection transmission mechanism, wherein one of the first rotating shaft and the second rotating shaft is connected with the output shaft, and the polishing disc is connected with the other one of the first rotating shaft and the second rotating shaft.
In the above-mentioned technical scheme, the motor passes through the aforesaid overload protection drive mechanism and connects the polishing dish, first pivot and second pivot pass through drive assembly transmission moment of torsion, make first pivot and second pivot synchronous rotation, make the motor drive the polishing dish and rotate, when the polishing dish receives the resistance great and leads to the moment of torsion great, drive assembly's one end gets into the ring channel from the draw-in groove, first pivot and second pivot skid relatively, avoid overload damage, and when first pivot and second pivot skid relatively, first pivot and second pivot are difficult to follow axial separation, can not lead to bigger security problem. In addition, after the load disappears or reduces, the one end of drive assembly can get back to the draw-in groove from the ring channel, and the transmission moment of torsion again for the polisher need not to shut down because of overload, and work efficiency is higher.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a perspective view of a sander according to an embodiment of the present application;
fig. 2 is an exploded view of a sander according to an embodiment of the present application;
fig. 3 is a front view of a sander according to an embodiment of the present application;
FIG. 4 is a cross-sectional view A-A of FIG. 3;
FIG. 5 is a front view of a second shaft according to an embodiment of the present application;
FIG. 6 is a section B-B of FIG. 5;
FIG. 7 is an enlarged view of a portion of FIG. 6;
FIG. 8 is a cross-sectional view of FIG. 5C-C;
FIG. 9 is a perspective view of a transmission assembly provided in an embodiment of the present application;
FIG. 10 is a schematic diagram of a transmission assembly according to an embodiment of the present application engaged with a clamping groove;
fig. 11 is a schematic view of a transmission assembly according to an embodiment of the present application engaged with an annular groove.
Icon: 1-a motor; 11-an output shaft; 2-grinding disc; 21-a compression nut; 3-a first rotating shaft; 31-a body portion; 311-shaft hole; 32-a sleeve portion; 321-through holes; 322-mounting part; 4-a second rotating shaft; 41-a first section; 411-axial projection; 42-a second section; 421-step surface; 422-limit protrusions; 43-an annular groove; 44-clamping grooves; 5-a transmission assembly; 51-connecting part; 52-a support; 53-balls; 6-a rotating bearing; r-radial; p-axial direction.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present application, it should be noted that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate an azimuth or a positional relationship based on that shown in the drawings, or an azimuth or a positional relationship in which a product of the application is conventionally put in use, it is merely for convenience of describing the present application and simplifying the description, and it is not indicated or implied that the referred device or element must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like in the description of the present application, if any, are used for distinguishing between the descriptions and not necessarily for indicating or implying a relative importance.
Furthermore, the terms "horizontal," "vertical," and the like in the description of the present application, if any, do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present application, it should also be noted that, unless explicitly stated and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
The application provides an overload protection transmission mechanism which is used for transmitting a driving part and an executing part of connecting equipment so as to solve the problem of part damage caused by overload and improve the working efficiency.
The overload protection transmission mechanism provided by the application is suitable for a scene that any motor drives a load, and the embodiment takes a grinding machine as an example for explanation.
As shown in fig. 1 and 2, the polisher comprises a motor 1 and a polishing disc 2, and an overload protection transmission mechanism is connected with the motor 1 and the polishing disc 2 so as to drive the polishing disc 2 through the motor 1 and enable the motor 1 and the polishing disc 2 to rotate relatively and independently when in overload, so that damage to the motor 1 or the polishing disc 2 caused by overlarge load is avoided.
The overload protection transmission mechanism comprises a first rotating shaft 3, a second rotating shaft 4 and a transmission assembly 5, wherein the first rotating shaft 3 and the second rotating shaft 4 are coaxially connected, one end, far away from the second rotating shaft 4, of the first rotating shaft 3 is connected with the output end of the motor 1, and one end, far away from the first rotating shaft 3, of the second rotating shaft 4 is connected with the polishing disc 2. The first rotating shaft 3 and the second rotating shaft 4 can rotate relatively. The circumferential surface of the second rotating shaft 4 is provided with an annular groove 43 recessed in its own radial direction R and a catching groove 44, the annular groove 43 extending in the circumferential direction of the second rotating shaft 4 and passing through the catching groove 44. The transmission assembly 5 is disposed on the first rotating shaft 3, one end of the transmission assembly 5 can stretch and retract along the radial direction R relative to the first rotating shaft 3, and has a first position and a second position matched with the second rotating shaft 4, one end of the transmission assembly 5 is matched with the clamping groove 44 to transmit torque when in the first position, and one end of the transmission assembly 5 is matched with the annular groove 43 when in the second position. The transmission assembly 5 is configured to be pushed by the second spindle 4 from the first position to the second position, i.e. to exit from the catch groove 44 and enter the annular groove 43, when the torque reaches the set value.
The "set value" in the embodiment of the present application refers to a critical value that allows the transmission assembly 5 to switch between the annular groove 43 and the card slot 44. The set value may be set according to the maximum bearing capacity of the motor 1, the bearing capacity of the grinding disc 2, and the set value may be configured to be smaller than the maximum bearing capacity of the motor 1 and smaller than the maximum bearing capacity that the grinding disc 2 can bear.
When the transmission assembly 5 is matched with the clamping groove 44, the first rotating shaft 3 and the second rotating shaft 4 transmit torque through the transmission assembly 5, so that the first rotating shaft 3 and the second rotating shaft 4 synchronously rotate.
Through setting up the ring channel 43 of connecting draw-in groove 44, when overload, the moment of torsion reaches the setting value, and the effort between draw-in groove 44 and the second pivot 4 is great, and the inner wall of draw-in groove 44 extrudees the one end of drive assembly 5 to push out drive assembly 5's one end from draw-in groove 44, make drive assembly 5's one end get into ring channel 43 from draw-in groove 44, and at this moment, first pivot 3 and second pivot 4 skid relatively, and drive assembly 5's one end is removed along ring channel 43 and is not transmitted the moment of torsion, avoids overload damage.
And, when first pivot 3 and second pivot 4 relatively skid, under the cooperation of drive assembly 5 and ring channel 43, restriction first pivot 3 and second pivot 4 separate along axial P, avoid overload to lead to first pivot 3 and second pivot 4 to separate to lead to bigger security problem.
Meanwhile, the transmission assembly 5 is further configured to return to the first position from the second position when the torque is smaller than the set value, namely, after the load disappears or decreases, one end of the transmission assembly 5 can return to the clamping groove 44 from the annular groove 43, torque is transmitted again, synchronous rotation of the first rotating shaft 3 and the second rotating shaft 4 is achieved, the motor 1 does not need to be stopped due to overload, and the working efficiency of the polisher is improved.
The "peripheral surface of the second rotating shaft 4" in the embodiment of the present application refers to the outer peripheral surface or the inner peripheral surface of the second rotating shaft 4. For example, the first rotating shaft 3 and the second rotating shaft 4 may be matched in such a way that the first rotating shaft 3 is sleeved on the second rotating shaft 4, and the annular groove 43 and the clamping groove 44 are formed on the outer peripheral surface of the second rotating shaft 4; the first rotating shaft 3 and the second rotating shaft 4 may be matched in such a way that the second rotating shaft 4 is sleeved on the first rotating shaft 3, and the annular groove 43 and the clamping groove 44 are formed on the inner circumferential surface of the second rotating shaft 4.
As shown in fig. 3 and 4, the first rotation shaft 3 includes a body portion 31 and a sleeve portion 32, and the sleeve portion 32 is connected to one end of the body portion 31. The body portion 31 includes two surfaces opposed to each other in the axial direction P, and is provided with a shaft hole 311 penetrating the two surfaces, and the output shaft 11 of the motor 1 extends into and is connected to the shaft hole 311 from one side in the axial direction P of the body portion 31, and the sleeve portion 32 extends from the other side in the axial direction P of the body portion 31 in a direction away from the motor 1.
An annular groove 43 and a clamping groove 44 are formed on the outer peripheral surface of the second rotating shaft 4, the transmission assembly 5 is disposed on the sleeve portion 32, and one end of the transmission assembly 5 extends to abut against the outer peripheral surface of the second rotating shaft 4 along the radial direction R so as to extend into the annular groove 43 or the clamping groove 44. Realizing that the grinding disc 2 is driven or slipped under overload. Meanwhile, one end of the transmission assembly 5 is matched with the annular groove 43 or the clamping groove 44, and the transmission assembly also plays a role in preventing the first rotating shaft 3 and the second rotating shaft 4 from being separated along the axial direction P.
As shown in fig. 4 and 5, the second rotating shaft 4 includes a first section 41 and a second section 42 connected in the axial direction P, the first section 41 is inserted into the sleeve portion 32, and the first section 41 can rotate independently with respect to the sleeve portion 32.
In order to further prevent the first rotating shaft 3 and the second rotating shaft 4 from being separated along the axial direction P, and to ensure the stability of the fit of the first rotating shaft 3 and the second rotating shaft 4, the overload protection transmission mechanism further comprises a rotating bearing 6, wherein the rotating bearing 6 is arranged between the body portion 31 and the second rotating shaft 4 to connect the first section 41 of the body portion 31 and the second rotating shaft 4, and to ensure that the first section 41 can rotate stably in the sleeve portion 32. Illustratively, the inner diameter of the sleeve portion 32 is greater than the diameter of the shaft bore 311 of the body portion 31, the rolling bearing 6 is located within the sleeve portion 32 and attached to the surface of the body portion 31, the end of the first section 41 facing the body portion 31 forms an axial protrusion 411, and the axial protrusion 411 is attached to the rolling bearing 6.
The sanding disc 2 is fixedly connected to the second section 42. The diameter of the first section 41 is larger than the diameter of the second section 42 to form a step surface 421 between the first section 41 and the second section 42, that is, the outer peripheral surface of the first section 41 and the outer peripheral surface of the second section 42 are connected by the step surface 421. The step surface 421 is for receiving the grinding disc 2, in other words, the grinding disc 2 is sleeved on the second section 42 and abuts against the step surface 421.
The second section 42 is provided with an external thread, and the grinding machine further comprises a compression nut 21, wherein the compression nut 21 is in threaded fit with the second section 42, and the grinding disc 2 is limited to move along the axial direction P through the compression nut 21 and the step surface 421.
The outer peripheral surface of the second section 42 is also provided with a limiting protrusion 422, and the limiting protrusion 422 is used for positioning the compression nut 21 so as to prevent the compression nut 21 from excessively compressing the grinding disc 2, and prevent the grinding disc 2 from being damaged due to overlarge stress on the compressed area of the grinding disc 2 when the grinding disc vibrates.
Optionally, the limiting protrusion 422 extends to the step surface 421 along the axial direction P, so that the polishing disc 2 is sleeved on the outer peripheral surface of the limiting protrusion 422, so that the gap between the polishing disc 2 and the second section 42 is prevented from being too large, and stable operation of the polishing disc 2 is ensured. Optionally, along the direction that axial P deviates from step face 421, spacing protruding 422 and polishing dish 2 parallel and level to the clearance between gland nut 21 and the polishing dish 2 is big, guarantees polishing dish 2 steady operation.
As shown in fig. 5 and 6, the aforementioned annular groove 43 and the catching groove 44 are provided on the outer peripheral surface of the first section 41.
As shown in fig. 7, in the radial direction R, the depth h1 of the annular groove 43 is smaller than the depth h2 of the stuck groove 44. When the grinding disc 2 is overloaded, the transmission assembly 5 is retracted to the shallower annular groove 43 from the deeper clamping groove 44 under the action of the second rotating shaft 4, so that the first rotating shaft 3 and the second rotating shaft 4 relatively slip, and overload damage is effectively avoided.
Alternatively, the inner wall of the annular groove 43 smoothly transitions with the inner wall of the catching groove 44. The smooth transition means that the inner wall of the annular groove 43 and the inner wall of the clamping groove 44 are connected through a curved surface or an inclined surface, so that one end of the transmission assembly 5 can smoothly enter the annular groove 43 from the clamping groove 44 when overload occurs, and can return to the clamping groove 44 from the annular groove 43 when load is reduced, thereby being convenient for smoothly switching the matching state of the transmission assembly 5 and the second rotating shaft 4 and improving reliability.
As shown in fig. 8, the inner wall of the clamping groove 44 is a spherical surface, so that smooth transition between the inner wall of the clamping groove 44 and the inner wall of the annular groove 43 is facilitated, and the spherical surface has a better guiding effect, so that one end of the transmission assembly 5 is guided to be switched between the clamping groove 44 and the annular groove 43.
Optionally, the inner wall of the annular groove 43 is a cambered surface, so as to further facilitate the smooth passing between the inner wall of the clamping groove 44 and the inner wall of the annular groove 43. The inner wall of the annular groove 43 is an arc surface, which means that the inner wall of the annular groove 43 is a surface formed by a arc line rotating around the axis of the second rotating shaft 4.
Optionally, the number of the clamping grooves 44 is multiple, the clamping grooves 44 are arranged at intervals along the circumferential direction of the second rotating shaft 4, each clamping groove 44 is used for being matched with the transmission assembly 5, so that the time for the transmission assembly 5 to enter the clamping groove 44 from the annular groove 43 is shortened, after the load is reduced, the transmission assembly 5 can quickly enter the clamping groove 44 closest to the annular groove, the second rotating shaft 4 is driven, and the working efficiency is improved.
Optionally, the number of the transmission assemblies 5 is multiple, the multiple transmission assemblies 5 are arranged at intervals along the circumferential direction of the first rotating shaft 3, and the multiple transmission assemblies 5 correspond to the multiple clamping grooves 44, so that the multiple transmission assemblies 5 can drive the second rotating shaft 4 at the same time. The plurality of transmission assemblies 5 also play a role in supporting the second rotating shaft 4 in the radial direction R so as to prevent the second rotating shaft 4 from deviating along the radial direction R, ensure the coaxial centering of the first rotating shaft 3 and the second rotating shaft 4 and improve the assembly stability and the working reliability.
Illustratively, the outer peripheral surface of the first section 41 is provided with four clamping grooves 44 uniformly distributed along the circumferential direction of the first section 41, and the ring shape extends along the outer peripheral surface of the first section 41 and passes through the four clamping grooves 44 in sequence. The number of the transmission assemblies 5 is four, and the four transmission assemblies 5 are uniformly distributed along the axial direction P of the sleeve portion 32 so as to be capable of corresponding to the four clamping grooves 44.
In some embodiments, the location of the drive assembly 5 may be disposed within the sleeve portion 32 and between the sleeve portion 32 and the first segment 41.
In the present embodiment, the sleeve portion 32 is provided with the through hole 321, the through hole 321 penetrates from the outer peripheral surface of the sleeve portion 32 to the inner peripheral surface of the sleeve portion 32 in the radial direction R, and the through hole 321 corresponds to the position of the annular groove 43, so that one end of the transmission assembly 5 can pass through the through hole 321 to be engaged with the second rotating shaft 4, that is, so that one end of the transmission assembly 5 can pass through the through hole 321 to enter the annular groove 43 or enter the catching groove 44 provided on the extending path of the annular groove 43. The number of through holes 321 is the same as the number of transmission assemblies 5, i.e. when there are four transmission assemblies 5, the sleeve portion 32 is provided with four through holes 321.
By disposing the transmission assembly 5 within the through-hole 321, the transmission assembly 5 is easily installed and replaced. During installation, the first rotating shaft 3 and the second rotating shaft 4 can be connected first, then the transmission assembly 5 is placed into the through hole 321 from one end of the through hole 321, which is away from the first rotating shaft 3 along the radial direction R, so that the transmission assembly 5 is connected to the sleeve part 32, one end of the transmission assembly is abutted to the annular groove 43 of the second rotating shaft 4, after assembly, the first rotating shaft 3 and the second rotating shaft 4 are rotated relatively, and one end of the transmission assembly 5 can enter the clamping groove 44 from the annular groove 43, so that synchronous rotation of the first rotating shaft 3 and the second rotating shaft 4 is realized. When the transmission assembly 5 is replaced, the first rotating shaft 3 and the second rotating shaft 4 do not need to be detached, and the transmission assembly 5 only needs to be taken out from the through hole 321 and replaced by a new one.
Alternatively, as shown in fig. 4, the outer circumferential surface of the sleeve portion 32 is formed with a convex mounting portion 322, and the through hole 321 extends from the outer surface of the mounting portion 322 to the inner circumferential surface of the sleeve portion 32 in the radial direction R, and by providing the convex mounting portion 322, the length of the through hole 321 is prolonged, and the connection stability of the transmission assembly 5 and the sleeve portion 32 is improved.
Optionally, the transmission assembly 5 is configured to be movably disposed within the through bore 321 along the radial direction R. By adjusting the position of the transmission assembly 5 in the through hole 321, the pressing force between the transmission assembly 5 and the second rotating shaft 4 can be adjusted, so that the transmission assembly 5 and the second rotating shaft 4 are stably matched.
As shown in fig. 9, the transmission assembly 5 includes a connection portion 51, an elastic portion (not shown) and a support portion 52. The connection portion 51 is in threaded engagement with the through hole 321, the support portion 52 is telescopically connected to the connection portion 51 and engaged with the second rotation shaft 4, and the elastic portion is disposed between the connection portion 51 and the support portion 52 to urge the support portion 52 to protrude with respect to the connection portion 51.
Alternatively, the connecting portion 51 has a tubular structure with one end open and the other end closed, the outer circumferential surface of the connecting portion 51 is provided with external threads, the through hole 321 is provided with internal threads, and the connecting portion 51 can be screwed along the through hole 321 to be close to the second rotating shaft 4 or screwed out along the through hole 321 to be far away from the second rotating shaft 4; the supporting part 52 is a rod-shaped structure inserted in the cylindrical structure; the elastic part is a spring arranged in the connecting part 51, one end of the spring is abutted against the end face of the closed end of the connecting part 51, and the other end of the spring is abutted against the end face of the supporting part 52 positioned in the connecting part 51; an end surface of the support portion 52 extending from one end of the connection portion 51 abuts against the second rotation shaft 4.
When the connecting portion 51 is screwed more along the through hole 321 toward the second rotating shaft 4, the pressing force between the transmission assembly 5 and the second rotating shaft 4 is larger, the elastic portion is more compressed, the elastic portion is not easy to compress further, and the set value of the torque is larger.
When the connecting portion 51 is screwed less toward the second rotation shaft 4 along the through hole 321, the pressing force between the transmission assembly 5 and the second rotation shaft 4 is smaller, the elastic portion is less compressed, the elastic portion is easily further compressed, and the set value of the torque is smaller.
Through setting up connecting portion 51 and through-hole 321 as screw-thread fit for drive assembly 5 installation is stable, guarantees that support piece can support tight second pivot 4. By screwing the connecting portion 51 into or out of the second rotating shaft 4, the pressing force between the transmission assembly 5 and the second rotating shaft 4 can be adjusted, and the set value of torque can be adjusted conveniently.
On the other hand, the connection portion 51 of the tubular structure is matched with the support portion 52 of the rod-shaped structure, so that the moving path of the support portion 52 is stable, the elastic portion is limited, bending of the elastic portion is avoided, the elastic portion is prevented from falling out from between the connection portion 51 and the support portion 52, and the reliability of the transmission assembly 5 is high.
The end of the supporting portion 52 extending from the connecting portion 51 may be directly abutted against the second rotating shaft 4, for example, the end of the supporting portion 52 extending from the connecting portion 51 extends into the annular groove 43 or the clamping groove 44. Alternatively, the end surface of the support portion 52 at the end extending out of the connecting portion 51 is configured as a spherical surface so as to be smoothly moved into and out of the annular groove 43 and the card slot 44.
The end of the supporting portion 52 extending out of the connecting portion 51 may be indirectly abutted against the second rotating shaft 4, as shown in fig. 9, the transmission assembly 5 further includes a ball 53, the ball 53 is located between the supporting portion 52 and the second rotating shaft 4, and the supporting portion 52 is matched with the second rotating shaft 4 through the ball 53.
As shown in fig. 10, when the balls 53 are fitted in the catching grooves 44 by the supporting portions 52, the first rotating shaft 3 and the second rotating shaft 4 transmit torque through the balls 53, so that the first rotating shaft 3 and the second rotating shaft 4 rotate synchronously.
When overload occurs, as shown in fig. 11, the torque reaches the set value, the inner wall of the clamping groove 44 presses the ball 53, and one end of the transmission assembly 5 is pushed out of the clamping groove 44, so that the ball 53 enters the annular groove 43 from the clamping groove 44, at this time, the first rotating shaft 3 and the second rotating shaft 4 relatively slip, and the ball 53 moves along the annular groove 43 without transmitting torque, thereby avoiding overload damage.
Because the supporting portion 52 of the transmission assembly 5 is indirectly matched with the second rotating shaft 4 through the balls 53, the balls 53 can transmit the pressing force along the radial direction R, meanwhile, the balls 53 are positioned in the axial direction P by the inner wall of the through hole 321, the balls 53 are matched with the clamping grooves 44 or the annular grooves 43 to position the second rotating shaft 4 in the axial direction P, so that the second rotating shaft 4 is prevented from being separated from the first rotating shaft 3 along the axial direction P, and the balls 53 cannot transmit the force along the axial direction P to the supporting portion 52, so that the connecting portion 51 and the supporting portion 52 are prevented from being damaged due to shearing force.
Optionally, the connecting portion 51 is a double-layer cylinder, an interlayer space is formed between the inner-layer cylinder and the outer-layer cylinder, connecting holes for communicating the interlayer space are formed in two ends of the inner-layer cylinder, hydraulic oil is filled in the connecting portion 51, a piston is arranged at one end of the supporting portion 52 located in the connecting portion 51, the inner space of the inner-layer cylinder is divided into a rod cavity and a rodless cavity by the piston, and the elastic portion is arranged in the rodless cavity. When the supporting portion 52 is expanded and contracted, the piston moves between the connecting holes at both ends to press the hydraulic oil out of the inner cylinder tube from the connecting hole at one end and enter from the connecting hole at the other end through the interlayer space, so that the expansion and contraction of the supporting portion 52 are more stable. Alternatively, the set value of the torque may also be adjusted by setting the oil pressure in the connecting portion 51.
In addition, the embodiment of the application also provides a polishing machine, which comprises a motor 1, a polishing disc 2 and an overload protection transmission mechanism, wherein one of the first rotating shaft 3 and the second rotating shaft 4 is connected with an output shaft 11, and the polishing disc 2 is connected with the other of the first rotating shaft 3 and the second rotating shaft 4. The first shaft 3 of the overload protection gear is connected to the output shaft 11 of the motor 1, and the second shaft 4 of the overload protection gear is connected to the sanding disc 2.
The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (11)

1. An overload protection transmission mechanism, comprising:
a first rotating shaft;
the second rotating shaft is coaxial with the first rotating shaft and can be arranged in a relative rotating manner, an annular groove and a clamping groove which are recessed along the radial direction of the second rotating shaft are formed in the peripheral surface of the second rotating shaft, and the annular groove extends along the circumferential direction of the second rotating shaft and passes through the clamping groove;
the transmission assembly is arranged on the first rotating shaft, one end of the transmission assembly can stretch and retract relative to the first rotating shaft along the radial direction and is provided with a first position and a second position matched with the second rotating shaft, one end of the transmission assembly is matched with the clamping groove to transmit torque when in the first position, one end of the transmission assembly is matched with the annular groove when in the second position, and the transmission assembly is configured to be pushed to the second position by the first rotating shaft when the torque reaches a set value.
2. The overload protection transmission of claim 1, wherein the depth of the annular groove is less than the depth of the catch groove in the radial direction.
3. The overload protection transmission mechanism of claim 1, wherein an inner wall of the annular groove smoothly transitions with an inner wall of the clamping groove.
4. The overload protection transmission mechanism of claim 3, wherein the inner wall of the clamping groove is spherical.
5. The overload protection transmission mechanism according to any one of claims 1 to 4, wherein the annular groove and the clamping groove are provided on an outer peripheral surface of the second rotating shaft;
the first rotating shaft comprises a body part and a sleeve part, the sleeve part is arranged at one end of the body part, the sleeve part is sleeved on the second rotating shaft and surrounds the outer peripheral surface of the second rotating shaft, and the transmission assembly is arranged on the sleeve part.
6. The overload protection transmission mechanism according to claim 5, wherein the sleeve portion is formed with a through hole penetrating a side wall of the sleeve portion in the radial direction, the transmission assembly is disposed in the through hole, and one end of the transmission assembly is fitted with the second rotating shaft through the through hole.
7. The overload protection transmission mechanism of claim 6, wherein the transmission assembly is movably disposed in the through bore in the radial direction.
8. The overload protection transmission mechanism of claim 6, wherein the transmission assembly includes a connection portion threadedly engaged with the through bore, an elastic portion telescopically coupled to the connection portion and engaged with the second shaft, and a support portion disposed between the connection portion and the support portion to urge the support portion to extend relative to the connection portion.
9. The overload protection transmission mechanism of claim 8, wherein the transmission assembly further includes balls located between the support and the second shaft, the support being engaged with the second shaft by the balls.
10. The overload protection transmission of claim 5, further comprising: and the rotating bearing is arranged between the body part and the second rotating shaft so as to connect the body part and the second rotating shaft.
11. A sander, comprising:
a motor having an output shaft;
polishing the grinding disc;
the overload protection transmission mechanism as claimed in any one of claims 1-10 wherein one of said first and second shafts is coupled to said output shaft and said sharpening disk is coupled to the other of said first and second shafts.
CN202210179041.6A 2022-02-25 2022-02-25 Overload protection transmission mechanism and polisher Pending CN116690327A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210179041.6A CN116690327A (en) 2022-02-25 2022-02-25 Overload protection transmission mechanism and polisher

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210179041.6A CN116690327A (en) 2022-02-25 2022-02-25 Overload protection transmission mechanism and polisher

Publications (1)

Publication Number Publication Date
CN116690327A true CN116690327A (en) 2023-09-05

Family

ID=87834362

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210179041.6A Pending CN116690327A (en) 2022-02-25 2022-02-25 Overload protection transmission mechanism and polisher

Country Status (1)

Country Link
CN (1) CN116690327A (en)

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