CN215238238U - Safety turnover saw - Google Patents

Abstract

The utility model relates to a safe turnover saw, which comprises a support piece, a working table plate and a switch structure; the method is characterized in that: the switch structure comprises a switch box, a table cutting control switch and a beveling control switch which are electrically connected with the motor; the first table top is provided with a first avoidance groove, the second table top is provided with a second avoidance groove, the second avoidance groove and the table cutting control rod are correspondingly arranged in the upward state of the first table top, in addition, in the beveling mode, the upper end of the table cutting control rod is positioned in the second avoidance groove, and the beveling control rod moves downwards to trigger a beveling control switch; when the working table plate is turned to the state that the second table surface is upward, the first avoiding groove and the beveling control rod are arranged correspondingly, in the table cutting mode, the upper end of the beveling control rod is located in the first avoiding groove, and the table cutting control rod moves downward to trigger the table cutting control switch. It is ensured that in one operating mode the switch in the other operating mode is disabled, thereby ensuring safe operation of the flip saw.

Description

Safety turnover saw

Technical Field

The utility model relates to a saw, concretely relates to safe type upset saw.

Background

The structure of the turnover saw comprises a frame, a bedplate arranged on the frame, two parallel and opposite working tables arranged on the bedplate, wherein the middle part of the bedplate is supported on the frame, the bedplate can turn over 180 degrees back and forth between two positions around a certain axis on the frame, a saw body provided with a saw blade driven by a motor to rotate is pivoted on a rocker arm arranged on the bedplate, a saw blade groove for the saw blade to pass through is arranged on the working bedplate, and the rocker arm can deflect left and right relative to the bedplate, so that the saw body not only can move up and down relative to the rocker arm, but also can deflect left and right relative to the bedplate along with the rocker arm. The turnover saw has two working modes of table cutting and beveling, namely, in the table cutting mode, the machine body is pressed to the bottom, the upper working table surface is parallel to the lower working table surface, the saw teeth penetrate through the saw blade grooves and are exposed on the upper working table surface, a workpiece is placed on the upper working table surface and moves relative to the rotating saw blade, and the saw blade is about to cut open the workpiece; secondly, in a beveling mode, the machine body is lifted and turned for 180 degrees, the workpiece is placed on the lower working table surface, and then the machine body is pressed down, so that the rotating saw blade is vertically or obliquely cut into the workpiece.

For example, the patent number CN200710095839.8 (publication number CN100496836C) of the invention patent "turnover saw" in china discloses a turnover saw, in which a support table (working table plate) of the turnover saw pivots relative to a frame (support) and can rotate 180 degrees, thereby realizing the table cutting and beveling modes. The above patents suffer from the following drawbacks:

when the work table is rotated to switch between the two modes (states), forgetting to cut off the power supply of the motor may occur, and thus, when the work table is improperly used, an operator may be injured, thereby causing a safety hazard.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that to the current situation of above-mentioned prior art, a safe and reliable's safe type upset saw is provided.

The utility model provides a technical scheme that above-mentioned technical problem adopted does: a safe turnover saw comprises a support piece;

a worktable plate which is arranged on the supporting piece and is provided with a first table top and a second table top which are oppositely arranged, and the first table top of the worktable plate is provided with a cutting saw and is arranged to turn 180 degrees relative to the supporting piece, so that the turning saw has a table cutting mode and a beveling mode; the cutting saw comprises a motor and a saw blade driven by the motor;

a switch structure disposed on the support;

the method is characterized in that: the switch structure comprises a switch box arranged on the supporting piece, and a table cutting control switch and a beveling control switch which are positioned in the switch box and are electrically connected with the motor, wherein the switch box is provided with a table cutting control rod arranged corresponding to the table cutting control switch and a beveling control rod arranged corresponding to the beveling control switch, and the table cutting control rod and the beveling control rod are both partially positioned on the switch box;

the first table top is provided with a first avoidance groove, the second table top is provided with a second avoidance groove, the second avoidance groove and the table cutting control rod are correspondingly arranged in the upward state of the first table top, in addition, in the beveling mode, the upper end of the table cutting control rod is positioned in the second avoidance groove, and the beveling control rod is pressed by the second table top to move downwards so that the beveling control switch and the motor are in a communication state; when the working table board is turned to a state that the second table surface of the working table board is upward, the first avoiding groove and the beveling control rod are correspondingly arranged, in a table cutting mode, the upper end of the beveling control rod is positioned in the first avoiding groove, and the table cutting control rod moves downward under the pressing of the first table surface to enable the table cutting control switch and the motor to be in a connection state.

In order to put both the table cut control switch and the bevel control switch in an off state when the table plate is in the upward movement, the table plate is arranged to move up and down relative to the support, and in the up movement state of the table plate, both the table cut control switch and the bevel control switch are out of contact with the table plate and are in an off state. So, the work platen upset in-process prevents that the saw bit from rotating and hindering operating personnel, reduces the potential safety hazard.

In order to reduce the possibility of interference during the rotation of the work table, the work table is turned 180 ° in relation to the support element under the action of an external force when the work table is in the upward movement.

In order to lock the workbench plate and reduce the potential safety hazard, at least one of the left side and the right side of the supporting piece is provided with a locking mechanism which is used for locking the workbench plate on the supporting piece or releasing the locking state of the workbench plate under the lowest position state of the workbench plate and a first elastic piece which acts on the workbench plate and always enables the workbench plate to have the upward movement tendency, the locking mechanism comprises a locking piece used for locking the workbench plate on the supporting piece, and the workbench plate is arranged on the supporting piece in a sliding manner along the up-down direction under the locking state of the locking piece releasing the locking state of the workbench plate.

In order to improve the stability of supporting the working table plate, the left side and the right side of the supporting piece are respectively provided with a movable frame extending along the vertical direction, the movable frames are limited on the corresponding outer side surfaces of the supporting piece in a sliding mode along the vertical direction, and the left side and the right side of the working table plate are respectively arranged at the upper ends of the movable frames on the corresponding sides in a rotating mode through mounting shafts.

In order to provide upward assistance for the working table plate, each movable frame is correspondingly provided with at least one first elastic piece, each first elastic piece is a vertically arranged spring, the upper end of each spring is in contact with the corresponding movable frame, and the lower end of each spring is in contact with the corresponding supporting piece.

The locking member may be in the form of a locking hook, a positioning screw rod, or a latch assembly, but from the viewpoint of facilitating unlocking and locking, preferably, the locking member includes a locking hook rotatably disposed on the support member, the locking hook has a hook portion at a position above a rotation position of the locking hook, the operating platform plate is provided with a notch for engaging with the hook portion of the locking hook, and the locking mechanism further includes a second elastic member acting on the locking hook and always making the hook portion have a tendency to move toward the operating platform plate.

In order to automatically clamp the hook part of the lock hook in the corresponding notch when the working table plate moves downwards, the side wall surface of the working table plate is provided with an inclined surface which is gradually inclined inwards from top to bottom above the notch. So, when the work platen moves to latch hook department from the top down, the hook portion of latch hook earlier with the inclined plane contact, when the work platen continues the downstream, the hook portion of latch hook outwards moves under the effect on inclined plane, until the work platen move to shelve under support piece's state, the hook portion of latch hook blocks rapidly to the breach under the effect of torsional spring in to with the work platen locking on support piece, whole in-process need not artifical upset latch hook, can realize the locking to the work platen automatically, it is more convenient to lock.

In order to conveniently contain the scraps to achieve the purpose of easy cleaning, the supporting piece is a box body with a cavity inside and an open top, the working table plate is located at the open top of the box body, and the switch box is arranged on the upper portion of the outer wall surface of the box body.

In order to facilitate discharging of cutting scraps in the box body, the bottom surface of the box body is a guide surface which gradually inclines downwards from the periphery to the center, and a discharge port is formed in the position, close to the center, of the guide surface.

Compared with the prior art, the utility model has the advantages of: the first table top of the working table plate of the turnover saw is provided with a first avoidance groove, the second table top is provided with a second avoidance groove, the upper end of the table cutting control rod is positioned in the second avoidance groove and does not have external force acting on the table cutting control rod when the first table top is upward in a beveling mode, the beveling control rod moves downwards under the action of the second table top to trigger a beveling control switch, and then the beveling control switch is communicated with the motor, namely only the beveling control switch works, so that potential safety hazards caused by the working of the table cutting control switch are prevented; when the second table top is upward and in the table cutting mode, only the table cutting control switch works to prevent potential safety hazards caused by the operation of the beveling switch, so that the switch in one working mode is enabled to be invalid in the other working mode, and the operation safety of the turnover saw is ensured; in addition, when the working table plate moves upwards to a certain position, the cutting control switch and the beveling control switch are both in an off state, so that the safety of the working table plate in the overturning process is ensured.

Drawings

FIG. 1 is a schematic structural diagram of the bevel mode of the present embodiment;

FIG. 2 is a schematic view of the structure of FIG. 1 from another angle;

FIG. 3 is a schematic diagram of a portion of the structure of FIG. 1;

FIG. 4 is a schematic structural diagram of the present embodiment in the stage cutting mode;

FIG. 5 is a schematic structural view of the FIG. 1 in a state of being turned 180 degrees;

FIG. 6 is a schematic view of a portion of the structure of FIG. 5;

FIG. 7 is a schematic view of a portion of the structure of FIG. 6;

FIG. 8 is a cross-sectional view of FIG. 1;

FIG. 9 is a cross-sectional view of FIG. 4;

FIG. 10 is a schematic view of a portion of the structure of FIG. 5;

FIG. 11 is a schematic diagram of a switch structure;

FIG. 12 is a schematic view of a portion of the structure of FIG. 1;

FIG. 13 is a schematic structural view of the locking mechanism;

fig. 14 is a schematic view of the structure of fig. 13 at another angle.

Detailed Description

The present invention will be described in further detail with reference to the following embodiments.

As shown in fig. 1 to 14, the turnover saw of the present embodiment includes a supporting member, a work table 2, a cutting saw 3, a movable frame 4, a locking mechanism 5, a first elastic member, a handle 6, and a switch structure 7.

As shown in fig. 1, 2, 4 to 8, the support of this embodiment is a box 1 having a cavity 10 therein and an open top, and the work board 2 is located at the open top of the box 1. The bottom surface of the box 1 is a guide surface 101 inclined downward from the periphery to the center, and a discharge port 1011 is opened at a position near the center of the guide surface 101.

As shown in fig. 1 to 3, the work table 2 has a first table surface 2a and a second table surface 2b which are arranged opposite to each other, and the work table 2 is provided with a through groove 200 which penetrates the first table surface 2a and the second table surface 2 b. The cutting saw 3 is disposed on the first table surface 2a of the table plate 2 and includes a motor 31 and a saw blade 32 driven by the motor 31. The rear end of the cutting saw 3 is rotatably disposed on the first table top of the table top 2, the front end of the cutting saw 3 moves up and down relative to the table top 2 under the pressing action of external force, and the saw blade 32 passes through the through slot 200 when the cutting saw 3 is in a downward movement state, as shown in fig. 4 and 5. In addition, be provided with the retaining member of locking slitting saw position on slitting saw 3, the retaining member adopts the optional structure among the prior art, refer to the retaining member in the patent that the background art cites specifically, will not be repeated in detail in this embodiment.

As shown in fig. 6, the lock mechanisms 5 are provided on both the left and right sides of the case 1, and the two lock mechanisms 5 have the same configuration, and the lock mechanism 5 on the left side will be described below as an example. As shown in fig. 3 and 5, the locking mechanism 5 includes a locking member and a second elastic member. The locking piece is used for locking the working table plate 2 on the support member when the working table plate 2 is at the lowest position, the locking piece comprises two locking hooks 51 rotatably arranged on the support member, the two locking hooks 51 are arranged at intervals along the front-back direction, each locking hook 51 is substantially in a V shape in whole and comprises a first rod part 511 and a second rod part 512 which are connected, the connection part of the first rod part 511 and the second rod part 512 is rotatably connected with the box body 1 through a rotating shaft 514, specifically, the outer wall surface of the box body 1 is provided with a mounting seat 13, each rotating shaft corresponds to one mounting seat, and the rotating shaft 514 is rotatably arranged on the corresponding mounting seat 13. The second rods 512 of the two latch hooks 51 are connected by a connecting plate 513. The upper end of the first rod part 511 is provided with a hook part 5110, the top surface of the hook part 5110 is provided with an arc-shaped surface which gradually inclines towards the inside of the box body 1 from top to bottom, the working bedplate 2 is provided with a notch 22 which is clamped with the hook part 5110 of the locking hook 51, and the left side wall surface and the right side wall surface of the working bedplate 2 are provided with inclined surfaces 23 which gradually incline inwards from top to bottom above the notch 22. In order to select the first table top and the second table top of the working table board to be in an upward state, the notches 22 are provided with inclined surfaces 23, thus, each notch 22 is provided with two inclined surfaces 23 correspondingly, the notch 22 is positioned between the two inclined surfaces 23 on the corresponding side, and the inclined surfaces 23 positioned on the notches are gradually inclined towards the interior of the box body 1 from top to bottom.

As shown in fig. 13 and 14, each locking hook 51 has a second elastic element which acts on the locking hook 51 and always tends to move the hook 5110 in the direction of the work top 2 and then to be engaged in the corresponding notch 22. Specifically, the second elastic element is a torsion spring 52 mounted on the rotating shaft, a first end of the torsion spring 52 abuts against a surface of the first rod 511 departing from the hook 5110, and a second end of the torsion spring 52 abuts against the mounting seat 13 on the outer wall surface of the box 1. In this way, when the hook 5110 is in a state of being disengaged from the notch 22 (i.e., when the locking member is unlocked from the work table 2), the work table 2 is slidably provided on the box 1 along the vertical direction along with the movable frame, and the work table 2 can be turned 180 ° with respect to the box 1 by an external force when the work table 2 is in an upward movement state.

When sliding from top to bottom in order to realize work platen 2, all be provided with adjustable shelf 4 on the two lateral walls of the left and right sides of box 1, so, adjustable shelf 4 has two, and arranges along left and right direction interval. The left and right sides of the work table plate 2 are provided with mounting shafts 21 at positions adjacent to the middle, and the left and right sides of the work table plate 2 are rotatably provided on the movable frames 4 of the corresponding sides respectively by the corresponding side mounting shafts 21, the mounting shafts 21 extend in the left-right direction and are arranged substantially horizontally, so that the rotation axis of the work table plate 2 is arranged in the horizontal direction. The two movable frames 4 have the same configuration, and the movable frame 4 located on the left side will be described below as an example.

As shown in fig. 5, the movable frame 4 extends vertically, and moves upward relative to the box 1 by the first elastic member, and moves downward by the self-gravity of the work table 2 and the pressing-down of an external force. The left side of the work bench plate 2 is connected to the upper end of the movable frame 4 in a rotating manner, specifically, as shown in fig. 10, the top surface of the movable frame 4 has an extending plate 40 extending upward at a position near the middle, the extending plate 40 is provided with a mounting hole 401 for inserting the mounting shaft 21 of the corresponding side, and the top surface of the movable frame 4 except the extending plate 40 is on the same plane.

In order to provide an upward force assistance to the work top 2 when the work top 2 is in the unlocked state, the first elastic member acts on the work top 2 and always gives the work top 2a tendency to move upward. In this embodiment, as shown in fig. 5 and 7, the movable frame 4 is provided with a connecting rod 41 extending in a vertical direction, as shown in fig. 10, both ends of the connecting rod 41 are provided with guide rods 411 extending in a vertical direction, the outer side surface of the box body 1 is provided with guide grooves 111 extending in the vertical direction at positions corresponding to the guide rods 411, and the guide rods 411 are slidably limited in the guide grooves 111. Each movable frame 4 is provided with two first elastic members, each first elastic member is a vertically arranged spring 42, the periphery of each guide rod 411 is provided with one spring 42, and the lower ends of the two springs 42 are respectively abutted against the bottom surfaces of the guide grooves 111 of the box body 1.

In order to limit the workbench plate 2 to turn 180 degrees in a reciprocating manner and facilitate pulling the workbench plate 2 to move upwards, the left and right side walls of the workbench plate 2 are respectively provided with a handle 6, the two handles 6 are oppositely arranged and have the same structure, and the handle 6 on the left side is taken as an example for explanation. As shown in fig. 2 and 5, the handle 6 has a fixing rod 61 connected to the work table 2 and extending along the axis of rotation of the work table 2, the fixing rod 61 being located above the connecting plate 513 of the locking member. The handle 6 includes a fixing rod 61 between the two locking hooks 51 on the corresponding side and a longitudinal rod 62 connected to the fixing rod 61. The fixed bar 61 extends in the left-right direction, and the movable frame 4 is partially located below the fixed bar 61. The vertical bar 62 extends in the front-rear direction, the front end of the vertical bar 62 has a cross bar 63 connected to the work board 2 and arranged in parallel with the fixed bar 61, and an escape opening 64 through which the movable frame 4 passes in the state where the work board 2 is turned is left between the rear end of the vertical bar 62 and the work board 2. During the turning process of the work bench 2, the fixing rod 61 moves back and forth along the top surface of the movable frame 4 relative to the box body 1, as shown in fig. 2, the fixing rod 61 of the handle 6 is located in front of the mounting shaft 21 on the corresponding side in the upward state of the first table top 2a, as shown in fig. 4, and the fixing rod 61 of the handle 6 is located behind the mounting shaft 21 on the corresponding side in the upward state of the second table top 2 b. In this way, the workbench plate 2 is turned 180 ° back and forth, and the first table top 2a and the second table top 2b of the workbench plate 2 are alternatively in an upward state. As shown in fig. 1 and 2, when the first table top 2a is in an upward state and locked at the open top of the box body 1, the turnover saw is in a beveling mode, i.e. the first table top 2a is a beveling table top; as shown in fig. 4 and 5, the reversible saw is in a table-cutting mode when the second table top 2b is in an upward position and locked at the top opening of the case 1, i.e. the second table top 2b is a table-cutting table top.

As shown in fig. 1, 8 and 9, the switch structure 7 is disposed on the outer wall surface of the box body 1, and includes a switch box 71 disposed on the box body 1, and a cutting control switch 72 and a beveling control switch 73 which are located in the switch box 71 and are electrically connected to the motor 31, the switch box 71 is provided with a cutting control rod 721 disposed corresponding to the cutting control switch 72 and a beveling control rod 731 disposed corresponding to the beveling control switch 73, and the cutting control rod 721 and the beveling control rod 731 are both partially located on the switch box 71.

As shown in fig. 1 and fig. 3 to 5, the first table top 2a is provided with a first avoidance groove 20a, and the second table top 2b is provided with a second avoidance groove 20 b. As shown in fig. 8, when the first table top 2a is in an upward state, the second avoiding groove 20b is arranged corresponding to the cutting control rod 721, and in the beveling mode, the upper end of the cutting control rod 721 is located in the second avoiding groove 20b, at this time, the cutting control switch 72 is in an off state, and the beveling control rod 731 is pressed by the second table top 2b to move downward, so that the beveling control switch 73 and the motor 31 are in a connected state. As shown in fig. 9, when the working platform board 2 is turned to the state that the second table surface 2b is facing upward, the first avoiding groove 20a and the bevel control rod 731 are arranged correspondingly, and in the cutting mode, the upper end of the bevel control rod 731 is located in the first avoiding groove 20a, and the cutting control rod 721 moves downward under the pressing of the first table surface 2a to make the cutting control switch 72 and the motor 31 in the on state. In addition, in the state where the table plate 2 is moved upward, both the table cut control switch 72 and the beveling control switch 73 are out of contact with the table plate 2 and are in the off state.

The orientation of the above embodiment is described with particular reference to the direction of the arrows in figures 2 and 5.

The working process of the turnover saw is as follows:

the beveling mode works: as shown in fig. 1, 2 and 8, the first table top 2a is in an upward state, and the second table top 2b is attached to the top edge of the top opening of the box body 1, the second table top 2b presses down the top surface of the beveling control rod 731, the beveling control switch 73 is switched on, at this time, the beveling main switch (not shown) is pressed down, the motor can be started, and then the dicing saw 3 is pressed down, so that the miter operation can be performed. In this state, the top surface of the table-cutting control rod 721 falls into the second avoiding groove 20b, and the table-cutting control switch 72 remains in the off state without being subjected to an external force.

The bench cutting mode work: as shown in fig. 4, 5 and 9, the dicing saw is locked at a position close to the work deck, the saw blade 32 penetrates through the through slot 200, in the table cutting mode, the second deck 2b is in an upward state, the first deck 2a is in a downward state, the first deck 2a is attached to the top edge of the top opening of the box body 1, and the saw blade 32 penetrates through the through slot 200 and is located on the second deck 2 b. The first table top 2a presses down the top surface of the table-cutting control rod 721 to turn on the table-cutting control switch 72, and at this time, presses down the table-cutting main switch (not shown), so that the motor can be started, and then presses down the dicing saw 3, so that the table-cutting work can be performed. In this state, the top surface of the bevel control lever 731 falls into the first avoiding groove 20a, and the bevel control switch 73 remains in the off state without receiving an external force.

The two modes (bevel mode and table cutting mode) are switched, namely, the rotation of the worktable plate 2 is realized:

two hands hold two handles 6 of the working bedplate 2, and the thumb of the two hands simultaneously pokes the connecting plate 513 downwards, at the moment, a hook part 5110 of the lock hook 51 is separated from a gap 22 of the working bedplate 2 to release the locking state of the working bedplate 2 and the box body 1, the movable frame 4 moves upwards under the action of the spring 42, so that the working bedplate 2 is pushed to move upwards to the highest position, and the working bedplate 2 is rotated at the position, so that the working bedplate 2 is turned over by 180 degrees, under the state, the beveling control rod and the table cutting control rod are not stressed, and the beveling control switch and the table cutting control switch are both in an off state; the work bench 2 is pressed downwards, the hook 5110 moves outwards under the action of the inclined surface 23 of the work bench 2 and moves towards the corresponding notch 22 under the action of the torsion spring 52 so as to be limited in the corresponding notch 22, and then the work bench 2 is locked at the top opening of the box body 1.

Directional terms such as "front," "rear," "upper," "lower," "left," "right," "side," "top," "bottom," and the like are used in the description and claims of the present invention to describe various example structural portions and elements of the invention, but are used herein for convenience of description only and are to be determined based on the example orientations shown in the drawings. Because the disclosed embodiments of the present invention may be oriented in different directions, the directional terms are used for descriptive purposes and are not to be construed as limiting, e.g., "upper" and "lower" are not necessarily limited to directions opposite to or coincident with the direction of gravity.

Claims (10)

1. A safe turnover saw comprises a support piece;

a worktable plate (2) arranged on the support and having a first table top (2a) and a second table top (2b) arranged oppositely, and a cutting saw (3) arranged on the first table top (2a) and arranged to be turned 180 DEG relative to the support, so that the turning saw has a table cutting mode and a beveling mode; the cutting saw (3) comprises a motor (31) and a saw blade (32) driven by the motor (31);

a switch structure (7) arranged on the support;

the method is characterized in that: the switch structure (7) comprises a switch box (71) arranged on the support member, and a cutting control switch (72) and a beveling control switch (73) which are positioned in the switch box (71) and are electrically connected with the motor (31), the switch box (71) is provided with a cutting control rod (721) arranged corresponding to the cutting control switch (72) and a beveling control rod (731) arranged corresponding to the beveling control switch (73), and the cutting control rod (721) and the beveling control rod (731) are both partially positioned on the switch box (71);

a first avoidance groove (20a) is formed in the first table top (2a), a second avoidance groove (20b) is formed in the second table top (2b), the second avoidance groove (20b) and the cutting control rod (721) are correspondingly arranged in the upward state of the first table top (2a), in addition, in the beveling mode, the upper end of the cutting control rod (721) is positioned in the second avoidance groove (20b), and the beveling control rod (731) moves downwards under the pressing of the second table top (2b) so that the beveling control switch (73) and the motor (31) are in a communicated state; when the workbench plate (2) is turned to the state that the second table surface (2b) of the workbench plate is upward, the first avoidance groove (20a) and the beveling control rod (731) are correspondingly arranged, in a table cutting mode, the upper end of the beveling control rod (731) is located in the first avoidance groove (20a), and the table cutting control rod (721) moves downward under the pressing of the first table surface (2a) to enable the table cutting control switch (72) and the motor (31) to be in a connection state.

2. The safety flipping saw according to claim 1, wherein: the work table plate (2) is arranged to move up and down relative to the support, and when the work table plate (2) is in an upward movement state, the table cutting control switch (72) and the chamfering control switch (73) are both out of contact with the work table plate (2) and are in an off state.

3. The inverted saw of claim 1 or 2, wherein: the working table plate (2) is turned 180 degrees relative to the supporting piece under the action of external force when in an upward movement state.

4. The safety flipping saw of claim 3, wherein: at least one of the left side and the right side of the supporting piece is provided with a locking mechanism (5) which is used for locking the work table board (2) on the supporting piece or releasing the locking state of the work table board (2) when the work table board (2) is in the lowest position state, and a first elastic piece which acts on the work table board (2) and always enables the work table board (2) to have the upward movement trend, the locking mechanism (5) comprises a locking piece which is used for locking the work table board (2) on the supporting piece, and the work table board (2) is arranged on the supporting piece in a sliding mode along the up-down direction when the locking piece is in the releasing state of the locking on the work table.

5. The safety flipping saw of claim 4, wherein: the left side and the right side of the supporting piece are respectively provided with a movable frame (4) extending along the vertical direction, the movable frames (4) are limited on the corresponding outer side surfaces of the supporting piece in a sliding mode along the vertical direction, and the left side and the right side of the working table plate (2) are respectively arranged at the upper ends of the movable frames (4) on the corresponding sides in a rotating mode through mounting shafts (21).

6. The safety flipping saw of claim 5, wherein: every adjustable shelf (4) correspond there is at least one first elastic component, first elastic component is the spring of vertical setting, the upper end of spring with adjustable shelf (4) contact, the lower extreme of spring with support piece contacts.

7. The safety flipping saw of claim 4, wherein: the locking piece comprises a locking hook (51) rotatably arranged on the supporting piece, the locking hook (51) is provided with a hook part (5110) at a position above the rotating position of the locking hook, a notch (22) clamped with the hook part (5110) of the locking hook (51) is formed in the working bedplate (2), and the locking mechanism (5) further comprises a second elastic piece which acts on the locking hook (51) and enables the hook part (5110) to have a trend of moving towards the direction of the working bedplate (2).

8. The safety inverted saw of claim 7, wherein: the side wall surface of the working table plate (2) is provided with an inclined surface (23) which is gradually inclined inwards from top to bottom above the notch (22).

9. The safety flipping saw according to claim 1, wherein: the support piece is a box body (1) with a cavity (10) inside and an open top, the workbench plate (2) is located at the open top of the box body (1), and the switch box (71) is arranged on the upper portion of the outer wall surface of the box body (1).

10. The safety inverted saw of claim 9, wherein: the bottom surface of the box body (1) is a guide surface (101) which gradually inclines downwards from the periphery to the center, and a discharge port (1011) is formed in the position, close to the center, of the guide surface (101).

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