Trephine with saw blade convenient to disassemble and replace

Abstract

A trephine with a saw blade convenient to disassemble and replace comprises a machine body, a saw blade mounting seat and the annular saw blade, two positioning wheel assemblies arranged at intervals in the vertical direction are arranged in the saw blade mounting seat, and the two positioning wheel assemblies are in contact fit with the inner ring face of the rear end of the annular saw blade. The device further comprises a position adjusting mechanism and two first springs. The position adjusting mechanism is used for adjusting the positions of the two positioning wheel assemblies in the vertical direction, when the two positioning wheel assemblies oppositely get close in the vertical direction, the two positioning wheel assemblies can be separated from the inner ring face of the rear end of the annular saw blade, and otherwise, when the two positioning wheel assemblies reversely get away in the vertical direction, the two positioning wheel assemblies can be separated from the inner ring face of the rear end of the annular saw blade. The two positioning wheel assemblies can be in contact fit with the inner ring face of the rear end of the annular saw blade. The two first springs abut against the opposite sides of the two positioning wheel assemblies respectively, so that the two positioning wheel assemblies tend to be away from each other. The device has the advantages of novel structure, high reliability, convenience and easiness in adjustment and operation and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of electric tools, in particular to a ring saw with a saw blade that is easy to disassemble and replace. Background Art

[0002] Currently, there is a type of ring saw on the market that includes a body, a saw blade mounting base disposed at the front end of the body, and an annular saw blade mounted on the saw blade mounting base. The body is equipped with a drive motor, and the saw blade mounting base is equipped with a driving wheel, a driven wheel, and two positioning wheels. The driving wheel and the driven wheel are arranged relative to each other and respectively contact and cooperate with the two side surfaces of the annular saw blade. The two positioning wheels respectively contact and cooperate with the inner annular surface of the annular saw blade. During operation, the drive motor drives the driving wheel to rotate, causing the annular saw blade to perform a rotary cutting motion under the combined action of the driving wheel, the driven wheel, and the two positioning wheels. When replacing the annular saw blade of this ring saw, the two positioning wheels need to be adjusted to a position that is clear of the inner annular surface of the annular saw blade before the annular saw blade can be removed and replaced. Therefore, it is very necessary for relevant practitioners to design a position adjustment structure for the two positioning wheels. On the one hand, it ensures that the positioning wheels can be loosened or disengaged from the inner annular surface of the annular saw blade when the annular saw blade needs to be removed, and on the other hand, it can also allow the positioning wheels to regain contact with the inner annular surface of the annular saw blade after the annular saw blade is replaced and installed, and ensure the reliability of the contact. Utility Model Content

[0003] The purpose of the utility model is to provide a ring saw with two positioning wheel assemblies that can adjust the positions along the up and down directions, so that on the one hand, when the ring saw blade is disassembled and replaced, the two positioning wheel assemblies can be loosened or separated from the inner ring surface of the ring saw blade; on the other hand, after the ring saw blade is replaced, the two positioning wheel assemblies can return to the position of contact with the inner ring surface of the ring saw blade and ensure the reliability of the contact.

[0004] The purpose of the utility model is achieved through the following technical solutions:

[0005] The cam is adapted to move the saw blade forward and backward, and the cam is adapted to move the saw blade forward and backward, so that the cam can move the saw blade in a direction opposite to the forward direction, thereby preventing the cam from moving backward.

[0006] Furthermore, a guide slide rod extending in the up and down directions is provided in the saw blade mounting seat, and the two positioning wheel assemblies each include a positioning wheel mounting seat and a positioning wheel mounted on the positioning wheel mounting seat and used to contact and cooperate with the rear end inner ring surface of the annular saw blade, and the positioning wheel mounting seats of the two positioning wheel assemblies are respectively slid onto the upper and lower ends of the guide slide rod.

[0007] Furthermore, the position adjustment mechanism includes a knob arranged on the outside of the saw blade mounting seat, a turbine arranged in the saw blade mounting seat and fixedly connected to the knob, a worm meshing with the turbine and parallel to the guide slide, and two nuts respectively threaded on the inner sides of the upper and lower ends of the worm. The positioning wheel mounting seats of the two positioning wheel assemblies are also respectively slid on the outer sides of the upper and lower ends of the worm. The two first springs are respectively arranged on the upper and lower ends of the worm and located between the corresponding nuts and the corresponding positioning wheel mounting seats, and one end of the two first springs is against the corresponding nut and the other end is against the corresponding positioning wheel mounting seat.

[0008] Furthermore, the position adjustment mechanism also includes two second springs which are outermostly wrapped around the upper and lower ends of the worm and located on the outside of the positioning wheel mounting seats of the two positioning wheel assemblies. One end of the two second springs abuts against the corresponding positioning wheel mounting seat, and the other end abuts against the upper inner wall or the lower inner wall of the saw blade mounting seat.

[0009] Furthermore, a turbine shaft is provided at the center of the turbine, a turbine shaft mounting hole is provided at the corresponding position of the saw blade mounting seat, the turbine shaft is mounted in the turbine shaft mounting hole through a first bearing, and the knob is fixedly connected to the turbine shaft.

[0010] Furthermore, the positioning wheel mounting seats of the two positioning wheel assemblies each include a main seat and a sub-seater which are arranged opposite to each other on the left and right and fixedly connected by screws. A first bearing hole is provided on the opposite surface of the main seat, and a second bearing hole is provided on the opposite surface of the sub-seater. A positioning wheel rotating shaft is provided in the center of the positioning wheel of the two positioning wheel assemblies, and both ends of the positioning wheel rotating shaft are respectively installed in the corresponding first bearing hole and the corresponding second bearing hole through second bearings.

[0011] Furthermore, the main body seat is provided with a first set of holes for the guide slide rod to be sleeved therethrough and a second set of holes for the worm to be sleeved therethrough.

[0012] Furthermore, the upper end wall of the saw blade mounting seat is provided with a first positioning hole for the upper end of the guide slide rod to penetrate and position, and a second positioning hole for the upper end of the worm to penetrate and position, and the lower end wall of the saw blade mounting seat is provided with a third positioning hole for the lower end of the guide slide rod to penetrate and position, and a fourth positioning hole for the lower end of the worm to penetrate and position.

[0013] The utility model has the following beneficial effects:

[0014] When removing or replacing an annular saw blade, the two positioning wheel assemblies can be adjusted in a vertical direction toward each other, thereby loosening or disengaging from the inner surface of the annular saw blade, thereby creating favorable conditions for removing the annular saw blade. After the annular saw blade is replaced, the two positioning wheel assemblies can be adjusted in a vertical direction away from each other, thereby returning to a position of contact with the inner surface of the replaced annular saw blade. In addition, during this process, the two first springs respectively press against the facing sides of the two positioning wheel assemblies, causing the two positioning wheel assemblies to move away from each other, thereby ensuring reliable contact between the two positioning wheel assemblies and the inner surface of the annular saw blade. In short, the utility model has the advantages of novel structure, high reliability, and convenient and easy adjustment operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The utility model is a three-dimensional schematic diagram of a ring saw with a saw blade that is easy to disassemble and replace.

[0016] Figure 2 The utility model is an enlarged schematic diagram of the front end portion of a ring saw which is convenient for disassembling and replacing saw blades.

[0017] Figure 3 It is a schematic diagram of the saw blade mounting seat and its internal related structures in the present invention.

[0018] Figure 4 It is a structural diagram of the second positioning wheel assembly and the position adjustment mechanism in the utility model.

[0019] Figure 5It is a structural schematic diagram of the saw blade mounting seat in the utility model.

[0020] Figure 6 It is an exploded schematic diagram of the positioning wheel assembly in the utility model.

[0021] Figure 7 yes Figure 6 Another angle diagram of the co-seat shown in . DETAILED DESCRIPTION

[0022] The present invention will be further described in detail below with reference to the embodiments given in the accompanying drawings. In addition, it should be noted that the "up and down directions" described in the present invention are defined when the annular saw blade is in a vertical state.

[0023] like Figures 1 to 7 As shown, the utility model provides a ring saw that is easy to disassemble and replace the saw blade, including a body 1, a saw blade mounting seat 2 and an annular saw blade 3. The saw blade mounting seat 2 is connected to the front end of the body 1, the rear end 31 of the annular saw blade 3 is placed in the saw blade mounting seat 2, and the front end 32 of the annular saw blade 3 is exposed in front of the saw blade mounting seat 2. Two positioning wheel assemblies 4 are arranged at intervals in the upper and lower directions in the saw blade mounting seat 3, and the two positioning wheel assemblies 4 are respectively in contact with the inner ring surface 310 of the rear end of the annular saw blade 3.

[0024] The ring saw also includes a position adjustment mechanism 5 and two first springs 6. The position adjustment mechanism 5 is used to adjust the position of the two positioning wheel assemblies 4 in the vertical direction. When the two positioning wheel assemblies 4 move toward each other in the vertical direction, the two positioning wheel assemblies 4 can separate from the rear end inner annular surface 310 of the annular saw blade 3. Conversely, when the two positioning wheel assemblies 4 move away from each other in the reverse direction in the vertical direction, the two positioning wheel assemblies 4 can contact and cooperate with the rear end inner annular surface 310 of the annular saw blade 3. The two first springs 6 respectively press against the facing sides of the two positioning wheel assemblies 4, causing the two positioning wheel assemblies 4 to move away from each other, thereby ensuring that the two positioning wheel assemblies 4 can respectively contact the rear end inner annular surface 310 of the annular saw blade 3.

[0025] A guide slide rod 7 extending in the up and down directions is also provided in the saw blade mounting seat 2. The two positioning wheel assemblies 4 each include a positioning wheel mounting seat 41 and a positioning wheel 42 mounted on the positioning wheel mounting seat 41 and used to contact and cooperate with the rear end inner ring surface 310 of the annular saw blade 3. The positioning wheel mounting seats 41 of the two positioning wheel assemblies 4 are respectively slidably mounted on the upper and lower ends of the guide slide rod 7, so that the two positioning wheel assemblies 4 can move smoothly when adjusting their positions in the up and down directions.

[0026] The position adjustment mechanism 5 includes a knob 51 arranged on the outside of the saw blade mounting seat 2, a turbine 52 arranged in the saw blade mounting seat 2 and fixedly connected to the knob 51, a worm 53 meshing with the turbine 52 and parallel to the guide slide 7, and two nuts 54 respectively threaded on the inner sides of the upper and lower ends of the worm 53. The positioning wheel mounting seats 41 of the two positioning wheel assemblies 4 are also slid on the outer sides of the upper and lower ends of the worm 53, and the two first springs 6 are respectively arranged on the upper and lower ends of the worm 53 between the corresponding nuts 54 and the corresponding positioning wheel mounting seats 41, and one end of the two first springs 6 is against the corresponding nut 54, and the other end is against the corresponding positioning wheel mounting seat 41.

[0027] The position adjustment mechanism 5 also includes two second springs 55 that are outermostly wrapped around the upper and lower ends of the worm 53 and located outside the positioning wheel mounting seats 41 of the two positioning wheel assemblies 4. One end of the two second springs 55 abuts against the corresponding positioning wheel mounting seats 41, and the other end abuts against the upper inner wall 201 or the lower inner wall 202 of the saw blade mounting seat 2.

[0028] The adjustment principle of the position adjustment mechanism 5 is described as follows:

[0029] The knob 51 is turned clockwise, and the turbine 52 rotates accordingly and drives the worm 53 to rotate, so that the two nuts 54 move outwards along the worm 53, and push the two first springs 6 and the positioning wheel mounting seat 41 of the two positioning wheel assemblies 4 outwards in turn, and the two second springs 55 are compressed and stored until the positioning wheels 42 of the two positioning wheel assemblies 4 come into contact with the rear end inner ring surface 310 of the annular saw blade 3, thereby providing positioning and guiding functions for the rotational movement of the annular saw blade 3 during operation. In addition, in this process, since the two first springs 6 are pushed outwards by the two nuts 54, When the wheel assembly 4 is in motion, it is also in a compressed state, and at this time the elastic force of the two first springs 6 is greater than the elastic force of the two second springs 55, that is, at this time the elastic force of the two first springs 6 acting on the positioning wheel mounting seat 41 of the two positioning wheel assemblies 4 is greater than the elastic force of the two second springs 55 acting on the positioning wheel mounting seat 41 of the two positioning wheel assemblies 4, so that the positioning wheel 42 of the two positioning wheel assemblies 4 is pressed against the rear end inner ring surface 310 of the annular saw blade 3 by the elastic force of the two first springs 6, thereby effectively ensuring the reliability of the contact and fit between the positioning wheel 42 and the rear end inner ring surface 310 of the annular saw blade 3.

[0030] Turn the knob 51 counterclockwise, the turbine 52 rotates accordingly and drives the worm 53 to rotate, causing the two nuts 54 to move inward along the worm 53 respectively. At this time, the two first springs 6 are no longer pushed by the two nuts 54, and the two first springs 6 gradually stretch as the two nuts 54 move inward, making the elastic force less than the two second springs 55. Subsequently, the two first springs 6 and the positioning wheel mounting seat 41 of the second positioning wheel assembly 4 move inward along the worm 53 under the elastic force of the two second springs 55 until the positioning wheel 42 of the second positioning wheel assembly 4 is separated from the inner annular surface of the rear end 31 of the annular saw blade 3, thereby making it convenient for the user to disassemble and replace the annular saw blade 3.

[0031] To ensure smooth rotation of the turbine 52, a turbine shaft 521 is provided at the center of the turbine 52, and a turbine shaft mounting hole 203 is provided at the corresponding position of the saw blade mounting seat 2. The turbine shaft 521 is installed in the turbine shaft mounting hole 203 through the first bearing 522, and the knob 51 is fixedly connected to the turbine shaft 521.

[0032] The positioning wheel mounting seats 41 of the two positioning wheel assemblies 4 each include a main seat 411 and a sub-seater 412 that are arranged opposite to each other on the left and right and fixedly connected by screws. A first bearing hole 4111 is provided on the opposite surface of the main seat 411, and a second bearing hole 4121 is provided on the opposite surface of the sub-seater 412. A positioning wheel rotating shaft 421 is provided at the center of the positioning wheel 42 of the two positioning wheel assemblies 4, and both ends of the positioning wheel rotating shaft 421 are respectively installed in the corresponding first bearing hole 4111 and the corresponding second bearing hole 4121 through a second bearing 4211, thereby ensuring the smooth rotation of the positioning wheel 41.

[0033] The main body seat 411 is provided with a first set of holes 4112 for the guide slide 7 to pass through, and a second set of holes 4113 for the worm 53 to pass through. That is to say, the positioning wheel mounting seat 41 of the second positioning wheel assembly 4 is slidably mounted on the guide slide 7 and the worm 53 through the first set of holes 4112 and the second set of holes 4113 respectively, so that the positioning wheel mounting seat 41 can slide on the guide slide 7 and the worm 53.

[0034] The upper end wall 201 of the saw blade mounting seat 2 is provided with a first positioning hole 2011 for the upper end of the guide slide rod 7 to penetrate and position, and a second positioning hole 2012 for the upper end of the worm 53 to penetrate and position. The lower end wall 202 of the saw blade mounting seat 2 is provided with a third positioning hole 2021 for the lower end of the guide slide rod 7 to penetrate and position, and a fourth positioning hole 2022 for the lower end of the worm 53 to penetrate and position.

[0035] The above description is only a preferred embodiment of the present invention and should not be used to limit the scope of implementation of the present invention. In other words, simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the content of the utility model description are still within the scope of the present utility model patent.

Claims

1. A ring saw for facilitating the removal and replacement of saw blades, comprising a body, a saw blade mounting seat, and an annular saw blade, wherein the saw blade mounting seat is connected to the front end of the body, the rear end of the annular saw blade is inserted into the saw blade mounting seat, the front end of the annular saw blade is exposed in front of the saw blade mounting seat, and two positioning wheel assemblies are provided in the saw blade mounting seat and spaced apart in the vertical direction, and the two positioning wheel assemblies are respectively in contact with the inner annular surface of the rear end of the annular saw blade; and characterized in that: It also includes a position adjustment mechanism and two first springs; The position adjustment mechanism is used to adjust the positions of the two positioning wheel assemblies in the up-down direction. When the two positioning wheel assemblies approach each other in the up-down direction, the two positioning wheel assemblies can separate from the rear end inner ring surface of the annular saw blade. Conversely, when the two positioning wheel assemblies move away from each other in the reverse direction in the up-down direction, the two positioning wheel assemblies can contact and cooperate with the rear end inner ring surface of the annular saw blade. The two first springs are respectively pressed against the opposite sides of the two positioning wheel assemblies, so that the two positioning wheel assemblies tend to move away from each other.

2. A ring saw with easy disassembly and replacement of saw blades according to claim 1, characterized in that: The saw blade mounting seat is also provided with a guide slide rod extending in the up and down directions. The two positioning wheel assemblies each include a positioning wheel mounting seat and a positioning wheel mounted on the positioning wheel mounting seat and used to contact and cooperate with the rear end inner ring surface of the annular saw blade. The positioning wheel mounting seats of the two positioning wheel assemblies are respectively slidably mounted on the upper and lower ends of the guide slide rod.

3. A ring saw with easy disassembly and replacement of saw blades according to claim 2, characterized in that: The position adjustment mechanism includes a knob arranged on the outside of the saw blade mounting seat, a turbine arranged in the saw blade mounting seat and fixedly connected to the knob, a worm meshing with the turbine and parallel to the guide slide, and two nuts respectively threaded on the inner sides of the upper and lower ends of the worm. The positioning wheel mounting seats of the two positioning wheel assemblies are also respectively slid on the outer sides of the upper and lower ends of the worm. The two first springs are respectively outer-circuited on the upper and lower ends of the worm and located between the corresponding nuts and the corresponding positioning wheel mounting seats, and one end of the two first springs abuts against the corresponding nuts and the other end abuts against the corresponding positioning wheel mounting seat.

4. A ring saw with easy disassembly and replacement of saw blades according to claim 3, characterized in that: The position adjustment mechanism also includes two second springs which are outer-circuited at the upper and lower ends of the worm and located outside the positioning wheel mounting seats of the two positioning wheel assemblies. One end of the two second springs abuts against the corresponding positioning wheel mounting seat, and the other end abuts against the upper inner wall or the lower inner wall of the saw blade mounting seat.

5. A ring saw with easy disassembly and replacement of saw blades according to claim 3 or 4, characterized in that: A turbine shaft is provided at the center of the turbine, a turbine shaft mounting hole is provided at a corresponding position of the saw blade mounting seat, the turbine shaft is mounted in the turbine shaft mounting hole through a first bearing, and the knob is fixedly connected to the turbine shaft.

6. A ring saw with easy disassembly and replacement of saw blades according to claim 3 or 4, characterized in that: The positioning wheel mounting seats of the two positioning wheel assemblies each include a main seat and a sub-seater that are arranged opposite to each other on the left and right and fixedly connected by screws. A first bearing hole is provided on the opposite surface of the main seat, and a second bearing hole is provided on the opposite surface of the sub-seater. A positioning wheel rotating shaft is provided in the center of the positioning wheel of the two positioning wheel assemblies, and both ends of the positioning wheel rotating shaft are respectively installed in the corresponding first bearing hole and the corresponding second bearing hole through second bearings.

7. A ring saw with easy disassembly and replacement of saw blades according to claim 6, characterized in that: The main body seat is provided with a first set of holes for the guide slide rod to be sleeved through gaps and a second set of holes for the worm to be sleeved through gaps.

8. A ring saw with easy disassembly and replacement of saw blades according to claim 3 or 4, characterized in that: The upper end wall of the saw blade mounting seat is provided with a first positioning hole for the upper end of the guide slide rod to penetrate and position, and a second positioning hole for the upper end of the worm to penetrate and position. The lower end wall of the saw blade mounting seat is provided with a third positioning hole for the lower end of the guide slide rod to penetrate and position, and a fourth positioning hole for the lower end of the worm to penetrate and position.

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