CN110539248A - polishing head and grinding tool - Google Patents
polishing head and grinding tool Download PDFInfo
- Publication number
- CN110539248A CN110539248A CN201910935217.4A CN201910935217A CN110539248A CN 110539248 A CN110539248 A CN 110539248A CN 201910935217 A CN201910935217 A CN 201910935217A CN 110539248 A CN110539248 A CN 110539248A
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- Prior art keywords
- support ring
- elastic support
- locking
- elastic
- locking mechanism
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- 238000005498 polishing Methods 0.000 title claims abstract description 31
- 230000007246 mechanism Effects 0.000 claims abstract description 54
- 239000011324 bead Substances 0.000 claims description 19
- 230000003068 static effect Effects 0.000 claims description 5
- 230000009471 action Effects 0.000 abstract description 3
- 244000137852 Petrea volubilis Species 0.000 description 3
- 229910001651 emery Inorganic materials 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000000149 penetrating effect Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 239000011521 glass Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000005381 potential energy Methods 0.000 description 2
- 239000010963 304 stainless steel Substances 0.000 description 1
- 229910000619 316 stainless steel Inorganic materials 0.000 description 1
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
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
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/04—Headstocks; Working-spindles; Features relating thereto
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
The invention relates to a polishing head and a grinding tool, wherein the polishing head comprises a clamping body, an elastic support ring, a core rod and a locking mechanism, the elastic support ring is arranged on the clamping body, the core rod is arranged in the clamping body and used for pushing the elastic support ring to enable the elastic support ring to expand along the radial direction, and the locking mechanism is arranged on the clamping body and locks the core rod through the elastic action to keep the elastic support ring in an expansion state. The position of the core rod is fixed by utilizing the elastic force generated by the locking mechanism, and the core rod is moved by overcoming the elastic force, so that the relative position between the core rod and the elastic support ring is adjusted, and the replacement of the abrasive paper ring can be realized.
Description
Technical Field
The invention relates to the technical field of machining, in particular to a polishing head and a grinding tool.
background
At present, the head of polishing of rifle configuration of polishing includes pivot, elasticity abrasive core, abrasive paper circle and self-tightening screw, elasticity abrasive core passes through self-tightening screw sets up the one end in the pivot, just self-tightening screw with the coaxial setting of pivot, the abrasive paper snare is established on the elasticity abrasive core. When screwing the self-tightening screw, the self-tightening screw applies axial acting force to the elastic grinding core so that the elastic grinding core expands in the radial direction while being shortened in the axial direction, and therefore friction force between the elastic grinding core and the abrasive paper ring is increased, and the abrasive paper ring can rotate along with the elastic grinding core when the rotating shaft drives the elastic grinding core to rotate.
When the sanding operation is carried out, the sanding head is arranged on the base of the abrasive tool, the self-tightening screws need to be loosened manually when the abrasive paper rings are replaced, then new abrasive paper rings are replaced, the self-tightening screws are screwed manually, the whole replacement process lasts for about 5min, the service life of each abrasive paper ring is about 10min, namely, the sanding paper rings need to be replaced by frequently stopping the machine in the working process, the labor intensity of operators is high, and the work efficiency of the sanding operation is low. Moreover, a large amount of dust exists in the environment of polishing operation in practice, for protecting operating personnel, when the abrasive paper ring is replaced, the polishing head is generally detached from the base and then transferred to a cleaner environment to replace the abrasive paper ring, and finally the polishing head is mounted on the base, so that the working strength of the operating personnel is further improved. In addition, when the abrasive paper ring is replaced, the self-tightening screw needs to be repeatedly screwed and loosened, so that the thread in the threaded hole for installing the self-tightening screw is easily abraded, and the polishing head is scrapped.
Disclosure of Invention
The invention aims to provide a polishing head and a grinding tool, wherein the polishing head can quickly replace an abrasive paper ring, so that the labor intensity of workers is reduced, and the working efficiency of the grinding tool is improved.
In order to achieve the above object, the present invention provides a polishing head, comprising:
A clamp body having an axially extending lumen;
The elastic support ring is partially sleeved on the clamping body and keeps axially and relatively static with the clamping body;
The core rod penetrates through the inner cavity, a locking groove is formed in the core rod, a pushing part is arranged at one end, close to the elastic supporting ring, of the core rod, and the pushing part is located outside the clamping body; and the number of the first and second groups,
The locking mechanism is arranged on the clamping body, has elasticity and is provided with an end part capable of protruding out of the inner cavity wall;
the polishing head has a first state and a second state, in the first state, the pushing part is used for extruding the elastic support ring at one end of the elastic support ring so as to enable the elastic support ring to expand in the radial direction, and meanwhile, the locking mechanism is abutted in a locking groove of the core rod to lock the core rod;
In the second state, the locking mechanism is separated from the locking groove, so that the core rod can move in the inner cavity and the pressing of the pushing part on the elastic support ring is released.
Optionally, the polishing head further comprises a sand paper ring, and the sand paper ring is sleeved on the elastic support ring;
In the first state, the abrasive paper ring is in close contact with the elastic support ring which expands radially and can rotate along with the elastic support ring.
Optionally, the locking mechanism includes an elastic member and a locking portion, a mounting hole communicated with the inner cavity is formed in the clamping body, the elastic member is fixed in the mounting hole, and the locking portion is connected with or abutted against the elastic member.
Optionally, the mounting hole is a threaded hole, an axis of the mounting hole is perpendicular to an axis of the clamping body, the locking mechanism is a bead screw, the bead screw is disposed in the threaded hole and includes a spring and a bead, the spring forms the elastic member, and at least a portion of the bead can extend into the inner cavity to form the locking portion.
Optionally, the locking mechanism is an elastic protrusion fixed on the inner cavity wall or an elastic rod inserted into the clamping body.
optionally, in the second state, an axial distance from the locking mechanism to a distal end of the elastic support ring is greater than a distance from the locking groove to a proximal end face of the abutting portion.
Optionally, the locking groove is a groove matching the shape of the end of the locking mechanism, or an annular groove extending in the circumferential direction.
optionally, the pushing part comprises a first boss, a connecting section and a second boss which are sequentially arranged, and the first boss, the connecting section and the second boss form an i-shaped structure to form a clamping groove between the two bosses; the first boss is used for pushing the elastic support ring.
Optionally, the clamping body has opposite first proximal and first distal ends, and the resilient support ring has opposite second proximal and second distal ends;
The second near end of the elastic support ring is sleeved on the first far end of the clamping body and keeps axially and relatively static with the clamping body, and the second far end of the elastic support ring extends beyond the first far end of the clamping body;
The pushing part of the core rod is arranged at the second far end of the elastic support ring and used for pushing the second far end of the elastic support ring.
Optionally, the inner cavity comprises a first chamber and a second chamber arranged in sequence along the axial direction; the mandrel comprises a first sub-rod body and a second sub-rod body;
The cross-sectional area of the first cavity is larger than the cross-sectional area of the second cavity, the first sub-rod body is matched with the first cavity and can move in the first cavity along the axial direction, and the second sub-rod body is matched with the second cavity and can move in the second cavity along the axial direction.
Optionally, the intersecting surface of the first sub-rod body and the second sub-rod body is a first intersecting surface, and the intersecting surface of the first chamber and the second chamber is a second intersecting surface;
When the mandrel is locked, a gap exists between the first intersecting surface and the second intersecting surface.
optionally, the locking mechanism is disposed on a portion of the clamping body corresponding to the first chamber.
To achieve the above object, the present invention also provides an abrasive tool including the polishing head as described above.
optionally, the device further comprises a manipulator, wherein the manipulator is used for clamping the core rod so as to drive the core rod to move in the inner cavity along the axial direction.
Compared with the prior art, the polishing head and the grinding tool have the following advantages:
the grinding tool comprises a grinding head, the grinding head comprises a clamping body, an elastic supporting ring, a core rod and a locking mechanism, the clamping body is provided with an inner cavity, the elastic supporting ring is partially sleeved on the clamping body and keeps axially relative static with the clamping body, the core rod is arranged in the inner cavity in a penetrating mode, a pushing part is arranged on the core rod, and the locking mechanism is used for unlocking and locking the core rod through elastic potential energy. When the locking mechanism is actually used, the pushing part extrudes the elastic support ring to enable the elastic support ring to radially expand, and meanwhile, the core rod is elastically locked through the locking mechanism; and then an acting force is provided, so that the acting force can overcome the elastic potential energy, when the locking mechanism releases the locking of the core rod, the core rod can move in the direction away from the elastic support ring, and the pushing part releases the extrusion of the elastic support ring. Therefore, through the expansion of the elastic support ring, the abrasive paper ring and the elastic support ring are convenient to fix, and the abrasive paper ring synchronously rotates along with the elastic support ring to realize the polishing function. When the abrasive paper ring needs to be replaced, the abrasive paper ring can be replaced only by ensuring that the elastic force of the locking mechanism is not enough to fix the core rod so that the core rod can move and the pressing of the pushing part on the elastic support ring is released. Meanwhile, the locking part is elastically controlled by the locking mechanism to lock the core rod, the abrasive paper ring does not need to be disassembled by screwing and loosening the screw, and the problem that the polishing head is scrapped due to thread abrasion is avoided.
And secondly, the grinding tool further comprises a manipulator, and the manipulator is used for clamping the core rod and driving the core rod to move in the inner cavity along the axial direction so as to realize automatic operation by replacing the abrasive paper ring.
drawings
Fig. 1 is a schematic structural view of a sanding head according to an embodiment of the present invention;
Fig. 2 is a schematic structural view of a sanding head according to an embodiment of the present invention, in which a core rod is not shown.
Detailed Description
To make the objects, advantages and features of the present invention more apparent, embodiments of the present invention are described in further detail below with reference to the accompanying drawings. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
as used in this specification and the appended claims, the singular forms "a", "an", and "the" include plural referents unless the content clearly dictates otherwise. As used in this specification and the appended claims, the term "or" is generally employed in its sense including "and/or" unless the content clearly dictates otherwise, and the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either fixedly connected, detachably connected, or integrally connected. Either mechanically or electrically. Either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations. The same or similar reference numbers in the drawings identify the same or similar elements.
It will be appreciated that in this embodiment, the terms "proximal" and "distal" refer to the relative orientation, position, and orientation of elements or actions with respect to one another from the perspective of the base of the abrasive article, although "proximal" and "distal" are not intended to be limiting, but generally refer to the end of the sanding head that is closer to the base during use, and "distal" refers to the end that is further from the base during use. In the orientation shown in fig. 1, the upper end of the clamping body is used for connecting with the base, so the "proximal end" refers to the upper end, and the "distal end" refers to the lower end.
referring to fig. 1 and 2, the polishing head according to the embodiment of the present invention includes a holder 100 including a housing 110, the housing 110 having an inner cavity 120 extending axially; the elastic supporting ring 200 is partially sleeved on the clamping body 100 and keeps axially relative to the clamping body 100; the mandrel 300 is arranged in the inner cavity 120 in a penetrating manner, the mandrel 300 comprises a rod body 310, and a locking groove 330 is arranged on the rod body 310; a pushing part 320 is arranged at one end of the rod body 310 close to the elastic support ring 200, and the pushing part 320 is located outside the clamping body 100 and can push against the elastic support ring 200, that is, one end of the inner cavity 120 close to the elastic support ring 200 is communicated with the outside, and the other end can be communicated or sealed; and a locking mechanism 400 disposed on the housing 110, wherein the locking mechanism 400 has elasticity and an end portion capable of protruding out of the wall of the inner cavity 120.
In actual use, the elastic support ring 200 is pressed by the pressing part 320 to expand the elastic support ring 200 in the radial direction, and at this time, the end of the locking mechanism 400 abuts against the locking groove 330 on the mandrel 300 to restrict the axial movement of the mandrel 300, so that the elastic support ring 200 and the pressing part 320 are kept in a pressed state. That is, when not in use, the axial distance between the locking mechanism 400 and the distal end of the elastic support ring 200 is slightly larger than the axial distance between the locking groove 330 and the proximal end surface of the pushing part 320. This ensures that the resilient support ring 200 is compressed when the locking mechanism 400 and the locking groove 330 are locked to each other.
since the locking mechanism 400 has elasticity, when a large axial force is applied to the mandrel 300, the locking mechanism 400 is slightly deformed by being pressed, and the end portion can be disengaged from the locking groove 330, so that the axial restraint of the mandrel 300 can be released, the mandrel 300 can move in the clamping body 100, and when the mandrel moves in a direction away from the elastic support ring 200, the pressing of the elastic support ring 200 by the pushing portion 320 can be released.
in this embodiment, the elastic support ring 200 of the sanding head is provided with the sandpaper ring 500, when the mandrel is locked, the elastic support ring 200 expands in the radial direction due to being pressed by the pressing portion 320, so that the sandpaper ring 500 is in close contact with the outer surface of the elastic support ring 200, a friction force is generated between the two, and the friction force is sufficient to enable the sandpaper ring 500 to synchronously rotate with the elastic support ring 200 when the sanding head is driven to rotate, thereby achieving a sanding function. In this embodiment, the elastic support ring 200 may be a rubber ring.
In addition, when the emery paper ring 500 is replaced, the emery paper ring 500 can be replaced by applying a force (such as an axial pulling force or a pushing force) to the mandrel 300, or applying a force (such as a magnetic force or a pulling force) to the locking mechanism 400 to retract the end portion thereof, or applying a force to the mandrel 300 by the end portion thereof not enough to prevent the mandrel 300 from moving, and then moving the mandrel 300 to move the pushing portion 320 away from the elastic support ring 200 to release the pressing of the elastic support ring 200, so that the elastic support ring 200 is not expanded radially any more, and a gap is formed between the elastic support ring 200 and the emery paper ring 500.
That is, in this embodiment, the expansion and the return (i.e., the non-expansion state) of the elastic support ring 200 do not need to be regulated and controlled by tightening and loosening the screws, so that the manual operation strength can be reduced, and the time required for replacing the abrasive paper ring can be shortened. More specifically, in the present embodiment, the locking mechanism 400 may be operated automatically to unlock the mandrel 300, so that the mandrel 300 can move, and the pushing portion 320 is away from the elastic support ring 200.
In addition, the polishing head needs to contact polishing liquid or polishing wax during practical application, and in order to prevent the clamping body 100 and the mandrel 300 from being corroded by the polishing liquid or polishing wax, the clamping body 100 and the mandrel 300 may be made of corrosion-resistant materials, including but not limited to stainless steel, and specifically, the stainless steel may be 316 stainless steel, 630 stainless steel, 304 stainless steel, and the like.
The respective structures of the sanding head will be described in detail with reference to fig. 1 and 2.
in the axial direction, the clamping body 100 has opposite first proximal and first distal ends, the elastic support ring 200 has opposite second proximal and second distal ends, and the rod body 310 of the mandrel 300 has opposite third proximal and third distal ends.
Referring to fig. 2, the second proximal end of the elastic support ring 200 is sleeved on the first distal end of the clamping body 100 and is kept stationary axially relative to the clamping body 100, while the second distal end of the elastic support ring 200 extends beyond the first distal end of the clamping body 100. Referring to fig. 1, the third proximal end of the mandrel 300 may be located in the inner cavity 120, and the third distal end of the rod body 310 extends in the inner cavity 120 of the clamping body 100 and the elastic support ring 200 and protrudes from the second distal end of the elastic support ring 200. The pushing portion 320 is disposed on the third distal end of the rod 310, the shape of which is not particularly limited as long as it can abut against and press the second distal end of the elastic support ring 200, and may be a circular or other flat plate, a circular truncated cone, a truncated square cone, a rectangular parallelepiped, a hemisphere, etc., the diameter of the circumscribed circle of the proximal end surface of which is greater than the diameter of the distal end of the inner cavity 120, so that it is not inserted into the inner cavity 120, and the end surface of the proximal end of the pushing portion 320 can abut against the distal end surface of the elastic support ring 200, so as to apply a pushing force to the elastic support ring 200.
Specifically, if the pushing portion 320 contacts with the second distal end of the elastic support ring 200 but there is no force therebetween, or the pushing portion 320 is far away from the second distal end of the elastic support ring 200, the elastic support ring 200 is in the initial natural state, as shown in fig. 2. When the pushing portion 320 is in close contact with the second distal end of the elastic support ring 200, and the pushing portion 320 pushes the second distal end of the elastic support ring 200 to apply an axial force to the elastic support ring 200, the elastic support ring 200 is compressed in the axial direction and expanded in the radial direction, as shown in fig. 1. In general, the elastic support ring 200 is changed from a slender shape in a natural state to a squat shape.
Further, the locking groove 330 is a recess on the surface of the rod 310 for receiving the end of the locking mechanism 400. The locking groove 330 may be a continuous annular groove extending in the circumferential direction of the rod body 310, or may be a groove matching the shape of the end of the locking mechanism 400, such as a circular groove, a square groove, or the like, in which case the position of the locking groove 330 matches the position of the locking mechanism 400. The number of the locking grooves may be 1 or more, may be equal to the number of the locking mechanisms 400, or may be more than the number of the locking mechanisms 400. In the case of having a plurality of locking grooves 330, it is preferable that the plurality of locking grooves 330 are uniformly distributed along the circumferential direction of the rod body 310. In this embodiment, a groove wall of the locking groove 330 is a curved surface, and the locking portion has a surface matching with the locking groove 330, that is, a surface of the locking portion facing the locking groove 330 is also a curved surface. This arrangement is advantageous in that, when the mandrel is locked, the locking portion has a large contact area with the mandrel 300 to increase the force applied between the locking portion and the mandrel 300, thereby improving the locking effect; when the mandrel 300 needs to be moved in the axial direction, the locking portion can be disengaged from the lock groove 330 by applying a large axial force to the mandrel 300. In other embodiments, the groove wall of the locking groove 330 may also be square or have other shapes.
The locking mechanism 400 may take various forms as long as it has elasticity and an end portion thereof can protrude from the wall of the inner cavity 120. For example, the locking mechanism 400 may be an elastic protrusion fixed on the wall of the inner cavity 120, and the protrusion may be a point-shaped protrusion or an annular protrusion extending along the circumferential direction; the locking mechanism 400 may be a rod made of an elastic material, which is inserted into the housing 110 of the holder 100 in a direction perpendicular to the wall of the cavity 120 and fixed, and has an end protruding out of the wall of the cavity 120; the locking mechanism 400 may also be a member formed by combining two parts, i.e. an elastic member and a locking portion, such as a member formed by connecting or abutting a rubber rod and a glass bead or a metal bead, or a member formed by connecting or abutting a spring and a glass bead or a metal bead, in this case, the housing 110 may be provided with a mounting hole penetrating the inner cavity 120, preferably, an axis of the mounting hole is perpendicular to an axis of the inner cavity 120, the elastic member of the locking mechanism 400 is at least partially fixedly disposed in the mounting hole, and the locking portion of the locking mechanism 400 may at least partially extend into the inner cavity 120, so that the locking portion may abut on the mandrel 300.
Preferably, the locking mechanism 400 can be implemented directly with commercially available bead screws. In this case, the mounting hole is a threaded hole, the bead screw is mounted in the threaded hole, and at least a portion of the bead screw can extend into the inner cavity 120 of the clamping body 100. In this way, the mandrel 300 is locked by the bead abutting in the locking groove 330 and applying a force to the mandrel 300. That is, at least a portion of the bead screw may serve as the locking portion, and the spring of the bead screw serves as the elastic member. The use of a bead screw as the locking mechanism 400 is preferable because the mounting of the locking mechanism 400 can be simplified, the frictional force between the bead and the mandrel 300 is low, and the axial movement of the mandrel 300 in the unlocked state is facilitated. The inner cavity 120 may be a cylindrical cavity with a uniform diameter, or may be composed of more than two sections with different diameters; accordingly, the rod body 310 may be a cylindrical rod having a uniform diameter, or may be composed of two or more segments having different diameters.
for example, optionally, from the first proximal end to the first distal end, the inner cavity 120 comprises a first chamber 121 and a second chamber 122 arranged in axial sequence; from the third proximal end to the third distal end, the wand 310 comprises a first sub-wand 311 and a second sub-wand 312 connected to each other. In the direction perpendicular to the axial direction, the area of the cross section of the first chamber 121 is larger than that of the cross section of the second chamber 122, the area of the cross section of the first sub-rod 311 is larger than that of the cross section of the second sub-rod 312, the cross section of the first sub-rod 311 matches the cross section of the first chamber 121, the cross section of the second sub-rod 312 matches the cross section of the second chamber 122, and the area of the cross section of the first sub-rod 311 is larger than that of the cross section of the second chamber 122. Thus, when the locking mechanism 400 unlocks the mandrel 300 and the mandrel 300 moves distally in the axial direction, the mandrel 300 is prevented from moving too far out of the inner cavity 120.
The intersection of the first sub-rod 311 and the second sub-rod 312 is referred to as a first intersection, and the intersection of the first cavity 121 and the second cavity 122 is referred to as a second intersection, and when the mandrel is locked, there is preferably a distance in the axial direction, which may range from 1 mm to 5mm, sufficient for the elastic support ring 200 to recover its natural shape and separate the sandpaper from the elastic support ring 200, while limiting the stroke of the mandrel 300. In other embodiments, the inner cavity 120 and the rod 310 are each in the shape of a cylinder of uniform diameter, in which case the stroke of the mandrel 300 needs to be manually controlled to avoid excessive pull-out.
Further, in the embodiment shown in fig. 1, the locking groove 330 is disposed on the first sub-rod 311, and correspondingly, the mounting hole is opened at a corresponding portion of the housing 110 to communicate with the first chamber 121. The position of the installation hole meets the following conditions: the axial distance between the mounting hole and the second distal end of the elastic support ring 200 is slightly larger than the axial distance between the locking groove 330 and the proximal end surface of the pushing part 320. This ensures that the resilient support ring 200 is compressed when the locking mechanism 400 and the locking groove 330 are locked to each other.
In this embodiment, the locking and unlocking of the mandrel can be switched by applying an axial force to the mandrel 300 to overcome the friction force generated by the force applied to the mandrel 300 by the locking mechanism 400, and further moving the mandrel 300 in the axial direction.
in this embodiment, the sanding head has a first state in which the mandrel 300 is locked and the elastic support ring 200 is radially expanded, and a second state in which the mandrel 300 is unlocked and movable in the inner cavity 120.
The specific working process of the polishing head of the embodiment is as follows:
Initially, the sanding head is in the second state and the resilient member is in a compressed state.
and then switching from the second state to the first state: the core rod 300 is pushed to the near end until the pushing part 320 presses the elastic support ring 200, and simultaneously the elastic piece stretches to push the locking part to extend into the locking groove 330 to lock the core rod 300, so that the sanding head is in the first state. Before the locking part is protruded into the locking groove 330, both the elastic member and the locking part may be received in the mounting hole, and the locking part is always in contact with the surface of the rod body 310.
Switching from the first state to the second state: a force toward the distal end is applied to the core rod 300 to overcome the force of the elastic member applied to the core rod through the locking portion, so that pulling the core rod 300 moves the core rod 300 toward the distal end to place the sanding head in the second state.
Since the groove wall of the locking groove 330 is a curved surface and the surface of the locking portion contacting the locking groove 330 is also a curved surface, the locking portion can move along the groove wall of the locking groove 330 and disengage from the locking groove 330 until the pushing portion 320 no longer presses the elastic support ring 200. When the locking part is separated from the locking groove 330, the locking part is always in contact with the surface of the rod body 310.
In addition, in order to facilitate applying a force to the mandrel 300 to enable the mandrel 300 to move axially, the abutting portion 320 may include a first boss 321 and a second boss 322, wherein the first boss 321 is disposed near the elastic support ring 200 and is used for abutting against the elastic support ring 200 to radially expand the elastic support ring, the second boss 322 is disposed at an end of the first boss 321 away from the elastic support ring 200, and the second boss 322 is connected to the first boss 321 through a connecting section 323 to form an "i" shape structure, so as to form a clamping groove between the second boss 322 and the first boss 321. An operator may apply force to the mandrel 300 by gripping the gripping groove with a tool.
The above description is only given by way of example of a preferred structure of the polishing head, but in practice, the present invention may also be used to unlock the core rod by the locking mechanism in other ways. For example, in one embodiment, the elastic member may be provided as a spring, electromagnets are disposed at both ends of the spring, and the electromagnets are attracted to each other, and when the sanding head is in the first state, the locking portion locks the core rod under the action of the spring, and when it is necessary to replace a loop of sandpaper, the current may be adjusted to increase the magnetic force between the electromagnets, so that the spring is compressed, so that the force applied to the core rod by the locking portion is reduced, and the core rod can be easily moved in the axial direction (i.e., the sanding head is in the second state). And when the sand paper ring is replaced, the core rod moves to the position where the abutting part abuts against the elastic support ring, the current is adjusted to reduce the magnetic force between the electromagnets, so that the spring extends to the position where the locking part abuts against the core rod to fix the core rod, and the polishing head is kept in the first state. In this embodiment, the locking groove and the locking portion may have any shape, such as a rectangular shape, and the locking portion may be completely separated from the mandrel by adjusting the magnetic force, so that the movement of the mandrel is not disturbed.
Furthermore, it will be appreciated that the compression and extension of the resilient member (e.g. spring) is in a relative state and not with respect to the original length of the resilient member, and indeed, whether the sanding head is in the first state or the second state, the resilient member may be in a compressed state with respect to the original length, provided that the length of the resilient member in the second state is less than the length of the resilient member in the first state.
Further, the invention also provides an abrasive tool comprising the polishing head. Preferably, the grinder may further include a manipulator for gripping the mandrel 300 to provide an axial force to the mandrel 300. The mechanical arm drives the core rod 300 to move, so that the intensity of manual operation is further reduced, and the possibility of full-automatic replacement of the abrasive paper ring 500 is provided.
Although the present invention is disclosed above, it is not limited thereto. Various modifications and alterations of this invention may be made by those skilled in the art without departing from the spirit and scope of this invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (14)
1. a sanding head, comprising:
A clamp body having an axially extending lumen;
The elastic support ring is partially sleeved on the clamping body and keeps axially and relatively static with the clamping body;
The core rod penetrates through the inner cavity, a locking groove is formed in the core rod, a pushing part is arranged at one end, close to the elastic supporting ring, of the core rod, and the pushing part is located outside the clamping body; and the number of the first and second groups,
the locking mechanism is arranged on the clamping body, has elasticity and is provided with an end part capable of protruding out of the inner cavity wall;
The polishing head has a first state and a second state, in the first state, the pushing part is used for extruding the elastic support ring at one end of the elastic support ring so as to enable the elastic support ring to expand in the radial direction, and meanwhile, the locking mechanism is abutted in a locking groove of the core rod to lock the core rod;
In the second state, the locking mechanism is separated from the locking groove, so that the core rod can move in the inner cavity and the pressing of the pushing part on the elastic support ring is released.
2. The sanding head of claim 1 further comprising a ring of sandpaper looped over said resilient support ring;
In the first state, the abrasive paper ring is in close contact with the elastic support ring which expands radially and can rotate along with the elastic support ring.
3. The sanding head according to claim 1 or 2, wherein the locking mechanism comprises an elastic member and a locking portion, the clamping body is provided with a mounting hole communicated with the inner cavity, the elastic member is fixed in the mounting hole, and the locking portion is connected with or abutted against the elastic member.
4. The sanding head of claim 3 wherein the mounting hole is a threaded hole and the axis of the mounting hole is perpendicular to the axis of the clamping body, and the locking mechanism is a bead screw disposed in the threaded hole and including a spring and a bead, the spring forming the resilient member, at least a portion of the bead being capable of extending into the interior cavity to form the locking portion.
5. The sanding head according to claim 1 or 2, wherein said locking means are elastic protrusions fixed on the inner cavity wall or elastic rods inserted into said clamping bodies.
6. The sanding head according to claim 1 or 2, wherein in the second state the axial distance of the locking mechanism to the distal end of the resilient support ring is greater than the distance of the locking groove to the proximal end face of the abutment portion.
7. A sanding head according to claim 1 or 2, wherein the locking groove is a groove matching the shape of the end of the locking mechanism, or a circumferentially extending annular groove.
8. The sanding head according to claim 1 or 2, wherein the pushing portion comprises a first boss, a connecting section and a second boss which are arranged in sequence, and the first boss, the connecting section and the second boss form an I-shaped structure so as to form a clamping groove between the two bosses; the first boss is used for pushing the elastic support ring.
9. The sanding head of claim 1 or 2 wherein the clamping body has opposing first proximal and distal ends, the resilient support band having opposing second proximal and distal ends;
the second near end of the elastic support ring is sleeved on the first far end of the clamping body and keeps axially and relatively static with the clamping body, and the second far end of the elastic support ring extends beyond the first far end of the clamping body;
the pushing part of the core rod is arranged at the second far end of the elastic support ring and used for pushing the second far end of the elastic support ring.
10. The sanding head of claim 9 wherein the internal cavity comprises first and second chambers arranged axially in series; the mandrel comprises a first sub-rod body and a second sub-rod body;
The cross-sectional area of the first cavity is larger than the cross-sectional area of the second cavity, the first sub-rod body is matched with the first cavity and can move in the first cavity along the axial direction, and the second sub-rod body is matched with the second cavity and can move in the second cavity along the axial direction.
11. The sanding head of claim 10 wherein the intersection of the first sub-rod with the second sub-rod is a first intersection and the intersection of the first and second chambers is a second intersection;
When the mandrel is locked, a gap exists between the first intersecting surface and the second intersecting surface.
12. The sanding head of claim 10 wherein the locking mechanism is disposed on the clamp body at a location corresponding to the first chamber.
13. an abrasive article comprising the sanding head of any of claims 1-12.
14. the grinding tool of claim 13 further comprising a manipulator for holding the mandrel for axial movement within the internal cavity.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910935217.4A CN110539248B (en) | 2019-09-29 | 2019-09-29 | Polishing head and grinding tool |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910935217.4A CN110539248B (en) | 2019-09-29 | 2019-09-29 | Polishing head and grinding tool |
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| CN110539248A true CN110539248A (en) | 2019-12-06 |
| CN110539248B CN110539248B (en) | 2024-07-19 |
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| CN201910935217.4A Active CN110539248B (en) | 2019-09-29 | 2019-09-29 | Polishing head and grinding tool |
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