CN113815051A

CN113815051A - Mechanical equipment with error-safety function

Info

Publication number: CN113815051A
Application number: CN202111232248.7A
Authority: CN
Inventors: 张侠挺; 陈晓珍; 王秉相
Original assignee: Zhejiang College of Security Technology
Current assignee: Zhejiang College of Security Technology
Priority date: 2021-10-22
Filing date: 2021-10-22
Publication date: 2021-12-21

Abstract

The invention relates to the technical field of mechanical equipment, and particularly discloses mechanical equipment with an error-safety function, which comprises a workbench and a support box, wherein a motor is arranged on the surface of the support box, a first rotating rod is fixedly connected to the output end of the motor, a saw blade is arranged at the output end of the first rotating rod, a first groove for placing the saw blade is formed in the surface of the workbench, vertical plates are symmetrically and fixedly connected to the bottom of the workbench, a first lead screw is rotatably connected between the vertical plates, a movable plate is in threaded connection with the outer wall of the first lead screw, first support plates are symmetrically arranged on the surface of the movable plate, a vacuum chuck is arranged at the bottom of each first support plate, a guide rod is fixedly connected between the vertical plates and penetrates through the movable plate, and the movable plate and the guide rods are in sliding connection with each other, the device utilizes machinery to replace manual work to move plates, improves the safety performance, and enables fingers of an operator to work in a safety area all the time, meanwhile, the accident injury of an operator caused by fatigue work can be effectively solved.

Description

Mechanical equipment with error-safety function

Technical Field

The invention relates to the technical field of mechanical equipment safety, in particular to mechanical equipment with a fault-safety function.

Background

The sliding table saw has high sawing precision, flexible production and high efficiency, and is widely applied to the plate processing process. The working area of the sliding table saw is generally divided into three areas, namely a safety area, a critical area and an injury area, wherein the safety area represents the safe operation working range of an operator, the critical area represents the range where potential hand injury can occur, and the injury area is equivalent to the range of a protective cover and has great danger.

In the actual production, the following safety accidents are easy to happen in the sawing process, the damage of the sliding table saw to the hand of an operator is mainly caused by too fast feeding in the direction of the saw blade, the speed exceeding 0.67m/sec belongs to dangerous speed, when the sliding table saw is normally used, the table saw performs sawing operation at normal speed, and the feeding speed is also normal speed at the moment; if the panel of the hard structure cuts, still with normal speed feeding this moment, because the panel structure is hard, be difficult to saw open, if the saw bit saw cuts with normal speed feeding this moment still, saw bit and by the production between the saw panel clamp saw phenomenon appear easily, the thickness of saw bit is generally about 3mm, in case the phenomenon of saw is pressed from both sides to the appearance that the saw bit "flies the board" or "bursts out the tooth" problem easily.

Disclosure of Invention

The present invention provides a mechanical device with a fault-safety function, aimed at facilitating the solution of the above-mentioned problems of the prior art.

In order to solve the problems, the invention adopts the following technical scheme:

the utility model provides a by mistake-safety function's mechanical equipment, includes the workstation, the bottom fixedly connected with support box of workstation, the surface mounting of support box has the motor, the first bull stick of output fixedly connected with of motor, the saw bit is installed to the output of first bull stick, open on the surface of workstation has the first recess that is used for placing the saw bit, the bottom symmetry fixedly connected with riser of workstation, two rotate between the riser and be connected with first lead screw, threaded connection has the movable plate on the outer wall of first lead screw, the both ends symmetry of movable plate is provided with first backup pad, the bottom of first backup pad is provided with vacuum chuck, fixedly connected with guide arm between the riser, the guide arm runs through the movable plate, and sliding connection between movable plate and the guide arm.

As a preferable scheme of the present invention, a second lead screw is rotatably connected between the vertical plates, the second lead screw penetrates through the moving plate, the second lead screw is in threaded connection with the moving plate, and the guide rod is located between the first lead screw and the second lead screw.

As a preferable scheme of the present invention, a first sprocket is coaxially and fixedly connected to an outer wall of the first lead screw, a second sprocket is coaxially and fixedly connected to an outer wall of the second lead screw, and the first sprocket and the second sprocket are in transmission connection through a chain.

As a preferable scheme of the present invention, a first gear is coaxially and fixedly connected to an outer wall of the first rotating rod, a second gear is engaged and connected to a bottom of the first gear, a first outer tube is coaxially and fixedly connected to a bottom of the second gear, a sliding rod is disposed in the first outer tube, a third gear is coaxially and fixedly connected to a bottom of the sliding rod, a fourth gear is coaxially and fixedly connected to an outer wall of the first lead screw, and the fourth gear is adapted to the third gear.

As a preferable scheme of the present invention, the inner wall of the first outer tube is symmetrically provided with first sliding grooves, the first sliding grooves are connected with sliding blocks in a sliding manner, the sliding blocks are fixedly connected with the sliding rods, a first spring is arranged between the first outer tube and the sliding rods, the first outer tube penetrates through the support box, the first outer tube is rotatably connected with the support box, and the first gear, the second gear, the third gear and the fourth gear are all bevel gears.

As a preferable scheme of the invention, the bottom of the workbench is symmetrically and fixedly connected with second support plates, a support rod is connected between the two second support plates, a push switch is arranged on the support rod and used for controlling the operation of a motor, a movable plate is slidably arranged on the support rod, a second groove for placing the movable plate is formed in the surface of the workbench, a second sliding groove is formed in the surface of the movable plate, the support rod is slidably arranged in the second sliding groove, the bottom of the movable plate is fixedly connected with a connecting plate through a second fixed disk, the sliding rod penetrates through the connecting plate, and the connecting plate is fixedly connected with the sliding rod.

As a preferable scheme of the present invention, the upper end of the movable plate is hemispherical, the bottom of the second support plate is fixedly connected with a first fixed disk, a second spring is disposed between the first fixed disk and the second fixed disk, a third sliding groove is formed in the surface of the first fixed disk, and the movable plate is slidably connected in the third sliding groove.

As a preferred scheme of the invention, the upper end of the workbench is connected with a protective cover through a concave plate, the protective cover is positioned above the saw blade, the inner wall of the protective cover is provided with a magnet, the upper end of the protective cover is provided with a suction fan, the air inlet end of the suction fan is communicated with the inner cavity of the protective cover, the air outlet end of the suction fan is provided with a dust collection box, one side of the movable plate is also connected with a connecting rod, the other end of the connecting rod is fixedly connected with the protective cover, and when the movable plate moves downwards, the connecting rod can be driven to move downwards, so that the protective cover can be driven to move downwards to cover the saw blade to play a protective role.

Compared with the prior art, the invention has the advantages that:

(1) the plate is placed on the surface of a workbench, a vacuum chuck sucks the plate, a slide rod slides in a first outer tube, a third gear is meshed with a fourth gear, a starting motor drives a first rotary rod to rotate, the rotation of the first rotary rod drives a saw blade to rotate, meanwhile, under the action of the first gear, the second gear, the third gear and the fourth gear, a first lead screw rotates, the rotation of the first lead screw drives a first chain wheel to rotate, under the transmission action of a chain, the rotation of the first chain wheel drives a second chain wheel to rotate, the rotation of the second chain wheel drives a second lead screw to rotate, a moving plate moves towards the direction of the saw blade, under the action of the first supporting plate and the vacuum chuck, the plate moves towards the direction of the saw blade, the cutting of the plate is realized, the device replaces manual work with machinery to move the plate, and the safety performance is improved, make the finger of operative employee carry out work in the safe area all the time, simultaneously, because operative employee's work content is more single, operating time is long, produce fatigue easily to two saw bit rotational speeds are high, and it is strong to mark a line saw bit disguise, and a very random action all has injured possibility, consequently, the unexpected injury that this equipment can effectively solve operative employee because tired work causes.

(2) The first groove is a dangerous area, the second groove is a critical area, an operator pushes the plate to move towards the direction of the saw blade in the safe area, when the plate contacts the movable plate, the upper end of the movable plate extends into the second groove under the continuous pushing action, the movable plate moves to drive the connecting plate to vertically move downwards, the connecting plate moves to drive the sliding rod to vertically move downwards, so that the third gear is meshed with the fourth gear, the plate is sucked by the vacuum chuck at the moment, the motor is started to realize the consistency of the moving speed of the plate and the rotating speed of the saw blade, the phenomenon of 'flying plate' is reduced, the safety performance of the equipment is further improved, when metal objects in the plate are damaged and flying out in the sawing process, the magnet sucks the saw teeth on the inner wall of the protective cover, the damage to the operator is reduced, and when the plate is cut, the suction fan is started to collect the debris in the dust collection box, the cleanness of the working environment of the operator is ensured.

Drawings

FIG. 1 is a schematic perspective view of the present invention;

FIG. 2 is a schematic perspective view of a portion of the present invention;

FIG. 3 is a schematic view of the internal structure of a first outer tube according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a movable plate structure according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a protective cover in an embodiment of the invention.

The reference numbers in the figures illustrate:

1. a work table; 2. a support box; 3. a motor; 4. a first rotating lever; 5. a saw blade; 6. a first groove; 7. a first lead screw; 8. a guide bar; 9. moving the plate; 10. a first support plate; 11. a vacuum chuck; 12. a vertical plate; 13. a first sprocket; 14. a second sprocket; 15. a chain; 16. a second lead screw; 17. a first gear; 18. a second gear; 19. a first outer tube; 20. a slide bar; 21. a first chute; 22. a slider; 23. a third gear; 24. a fourth gear; 25. a connector tile; 26. a movable plate; 27. a support bar; 28. a second support plate; 29. a second chute; 30. a first fixed disk; 31. a third chute; 32. a first spring; 33. a second fixed disk; 34. a second spring; 35. a second groove; 36. a concave plate; 37. a T-shaped screw; 38. a protective cover; 39. a magnet; 40. a suction fan; 41. a dust collection box; 42. a limiting strip; 43. a support block; 44. an adjustment hole; 45. a nut; 46. a second outer tube; 47. a connecting rod.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1:

referring to fig. 1-3, a mechanical device with error-safety function comprises a workbench 1, a support box 2 is fixedly connected to the bottom of the workbench 1, a motor 3 is installed on the surface of the support box 2, a first rotating rod 4 is fixedly connected to the output end of the motor 3, the first rotating rod 4 penetrates through the support box 2, the first rotating rod 4 is rotatably connected to the support box 2, a saw blade 5 is installed at the output end of the first rotating rod 4, a first groove 6 for placing the saw blade 5 is formed in the surface of the workbench 1, vertical plates 12 are symmetrically and fixedly connected to the bottom of the workbench 1, a first lead screw 7 is rotatably connected between the two vertical plates 12, a support plate 9 is connected to the outer wall of the first lead screw 7 through a thread, first support plates 10 are symmetrically arranged at two ends of the support plate 9, the first support plate 10 is L-shaped, a second outer tube 46 is fixedly connected to the bottom of the first support plate 10, and a vacuum chuck 11 is connected to the second outer tube 46, through the design to second outer tube 46, conveniently adjust the height of vacuum chuck 11 according to the thickness of panel, fixedly connected with guide arm 8 between riser 12, guide arm 8 runs through movable plate 9, and sliding connection between movable plate 9 and the guide arm 8.

A second screw rod 16 is rotatably connected between the vertical plates 12, the second screw rod 16 penetrates through the moving plate 9, the second screw rod 16 is in threaded connection with the moving plate 9, and the guide rod 8 is positioned between the first screw rod 7 and the second screw rod 16.

The outer wall of the first screw rod 7 is coaxially and fixedly connected with a first chain wheel 13, the outer wall of the second screw rod 16 is coaxially and fixedly connected with a second chain wheel 14, and the first chain wheel 13 is in transmission connection with the second chain wheel 14 through a chain 15.

In the process of cutting a plate by the conventional table saw equipment, the plate is often pushed to move forwards manually, and for enterprises with high requirements on processing precision, operators often pursue the processing precision on the surface of the plate to cause long working time of fingers in a critical area and a dangerous area, and the fingers can be injured.

The working principle of the embodiment is as follows: the plate is placed on the surface of the workbench 1, the height of the vacuum chuck 11 can be adjusted according to the thickness of the plate by the mutual matching between the second outer tube 46 and the vacuum chuck 11, the plate is sucked by the vacuum chuck 11, the starting motor 3 drives the first rotating rod 4 to rotate, the saw blade 5 is driven to rotate by the rotation of the first rotating rod 4, the first lead screw 7 is driven to rotate by applying external force, the first lead screw 7 drives the first chain wheel 13 to rotate, the second chain wheel 14 is driven to rotate by the rotation of the first chain wheel 13 under the transmission action of the chain 15, the second lead screw 16 is driven to rotate by the rotation of the second chain wheel 14, the moving plate 9 is moved towards the saw blade 5 under the actions of the first lead screw 7, the second lead screw 16 and the guide rod 8, the plate is moved towards the saw blade 5 under the actions of the first support plate 10 and the vacuum chuck 11, so as to realize the cutting of the plate, this device utilizes machinery to replace the manual work to remove panel, has improved the security performance, makes operative employee's finger work in safe area all the time, simultaneously, because operative employee's work content is more single, operating time is long, produce fatigue easily to two saw bit 5 rotational speeds are high, and marking off saw bit 5 disguised is strong, and a very random action all has the injured possibility, consequently, the unexpected injury that the operative employee caused because fatigue work can effectively be solved to this equipment.

Example 2:

the present embodiment is an improvement made on the basis of embodiment 1, please refer to fig. 1 to fig. 3.

The outer wall of the first rotating rod 4 is coaxially and fixedly connected with a first gear 17, the bottom of the first gear 17 is meshed with a second gear 18, the bottom of the second gear 18 is coaxially and fixedly connected with a first outer tube 19, a sliding rod 20 is arranged in the first outer tube 19, the bottom of the sliding rod 20 is coaxially and fixedly connected with a third gear 23, the outer wall of the first screw rod 7 is coaxially and fixedly connected with a fourth gear 24, and the fourth gear 24 is matched with the third gear 23.

First spout 21 has been opened to the inner wall symmetry of first outer tube 19, sliding connection has slider 22 in first spout 21, slider 22 and slide bar 20 fixed connection, through mutually supporting between first spout 21 and the slider 22, make things convenient for the removal of slide bar 20, and simultaneously, can prevent that slide bar 20 from breaking away from first outer tube 19 at the in-process that removes completely, be provided with first spring 32 between first outer tube 19 and the slide bar 20, first outer tube 19 runs through supporting box 2, and first outer tube 19 and supporting box 2 swivelling joint, first gear 17, second gear 18, third gear 23, fourth gear 24 are conical gear.

The working principle of the embodiment is as follows: slide bar 20 slides in first outer tube 19, make third gear 23 and fourth gear 24 mesh, starting motor 3 drives first bull stick 4 and rotates, the rotation of first bull stick 4 drives first gear 17 and rotates, the rotation of first gear 17 drives second gear 18 and rotates, the rotation of second gear 18 drives first outer tube 19 and rotates, the rotation of first outer tube 19 drives slide bar 20 and rotates, the rotation of slide bar 20 drives third gear 23 and rotates, the rotation of third gear 23 drives fourth gear 24 and rotates, thereby make first lead screw 7 rotate, and then promote panel and move towards 5 directions of saw bit.

Example 3:

this embodiment is an improvement made on the basis of embodiment 2, and fig. 4 is again combined with embodiment 2.

The bottom of the workbench 1 is symmetrically and fixedly connected with second support plates 28, support rods 27 are fixedly connected between the second support plates 28, press switches are arranged on the support rods 27 and used for controlling the operation of the motor 3, movable plates 26 are arranged on the support rods 27 in a sliding mode, second grooves 35 used for placing the movable plates 26 are formed in the surface of the workbench 1, second sliding grooves 29 are formed in the surface of the movable plates 26, the support rods 27 are arranged in the second sliding grooves 29 in a sliding mode, in the process that the movable plates 26 move downwards under the action of external force, the movable plates 26 can be pressed on the support rods 27 to touch the press switches, connecting plates 25 are fixedly connected to the bottoms of the movable plates 26 through second fixed disks 33, sliding rods 20 penetrate through the connecting plates 25, and the connecting plates 25 are fixedly connected with the sliding rods 20.

The upper end of the movable plate 26 is hemispherical, the bottom of the second supporting plate 28 is fixedly connected with a first fixed plate 30, a second spring 34 is arranged between the first fixed plate 30 and a second fixed plate 33, the movable plate 26 is convenient to automatically reset through the design of the second spring 34, a third sliding groove 31 is formed in the surface of the first fixed plate 30, and the movable plate 26 is slidably connected in the third sliding groove 31.

The saw blade 5 of the precision sliding table saw is a hard alloy saw blade with the thickness of 3mm, clamping saw cannot be generated due to stable plate material property when the artificial plate is normally sawed, the feeding speed is too high, the speed exceeding 0.67m/s belongs to dangerous speed (the upper limit of the feeding speed is 0.67m/s in the common sawing operation), and clamping saw is easily generated under the condition of large feeding force, and the phenomenon of plate flying is finally caused.

The working principle of the embodiment is as follows: the safe area represents the working range of safe operation of an operator, the critical area represents the range of potential human hand injury, partial working process is carried out in the safe area, the injury area is a dangerous area which is certainly injured, the first groove 6 is a dangerous area, the second groove 35 is a critical area, the operator pushes the plate to move towards the saw blade 5 in the safe area, when the plate contacts the movable plate 26, the plate is pushed continuously, the upper end of the movable plate 26 extends into the second groove 35, the movable plate 26 moves to drive the connecting plate 25 to move vertically downwards, the connecting plate 25 moves to drive the sliding rod 20 to move vertically downwards, so that the third gear 23 is meshed with the fourth gear 24, the plate is sucked by the vacuum suction cup 11 at the moment, the motor 3 is started, the moving speed of the plate is synchronous with the cutting rotating speed of the saw blade 5, when the plate with larger structural strength is cut, the plate is contacted with the saw blade 5 to carry out cutting operation, the plate is hard in structure and not easy to cut, and the plate is fed at a normal speed, so that the saw blade 5 is easily overheated, and the problem of tooth breakage is caused, therefore, the feeding speed of the plate needs to be controlled, the feeding speed of the plate is reduced, the phenomenon of clamping plates caused by too high feeding speed can be avoided as much as possible, the cutting rotating speed of the saw blade 5 is reduced when a hard plate meets the saw blade 5, the rotating speed of the saw blade 5 is reduced, the rotating speed of the first gear 17 is also reduced after the rotating speed of the saw blade 5 is reduced, the rotating speed of the third gear 23 is synchronously reduced, the feeding speed is reduced after the rotating speed of the third gear 23 is reduced, and the rotating speed of the saw blade 5 can be adjusted according to the hardness of the sawn plate, so that synchronous control is realized.

Example 4:

this embodiment is an improvement made on the basis of embodiment 3, and fig. 5 is again combined with embodiment 3.

Because the artificial board has metal detection process in the production process, generally does not contain metal objects, but metal objects are occasionally present in a few boards and inferior shaving boards, saw teeth are damaged and fly out in the sawing process, and operators are likely to be injured, therefore, the upper end of the workbench 1 is connected with a protective cover 38 through a concave plate 36, the protective cover 38 is positioned above the saw blade 5, the inner wall of the protective cover 38 is provided with a magnet 39, when the saw teeth are damaged and fly out in the sawing process of the metal objects in the boards, the magnet 39 sucks the saw teeth on the inner wall of the protective cover 38, the injury to the operators is reduced, the upper end of the protective cover 38 is provided with a suction fan 40, the air inlet end of the suction fan 40 is communicated with the inner cavity of the protective cover 38, the air outlet end of the suction fan 40 is provided with a dust box 41, because chips are generated in the board cutting process, and the space with the chips sucked by the operators for a long time can cause the injury to respiratory tracts, therefore, in the process of cutting the board, the suction fan 40 is started to collect the debris in the dust collecting box 41, it should be noted that a connecting rod 47 is further connected to one side of the movable plate 26, and the other end of the connecting rod 47 is connected and fixed with the protecting cover 38, so that when the movable plate 26 moves downwards, the connecting rod 47 can be driven to move downwards, and the protecting cover 38 can be driven to move downwards, so that the protecting cover 38 can cover the saw blade 5 to play a role in protection.

It should be added that, in order to adjust the height of the concave plate 36 according to the thickness of the plate, a plurality of adjusting holes 44 are formed on the surface of the concave plate 36, a T-shaped screw 37 penetrates through the protective cover 38, when in use, the T-shaped screw 37 penetrates through the corresponding adjusting hole 44, one end of the T-shaped screw 37 far away from the protective cover 38 is fixedly connected with the concave plate 36 by a nut 45, so as to fix the position of the concave plate 36, the two sides of the concave plate 36 are both provided with a limiting strip 42, the surface of the limiting strip 42 is fixedly connected with a supporting block 43 for supporting the protective cover 38, and the supporting block 43 corresponds to the adjusting hole 44.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. A mechanical device with fault-safe function, comprising a worktable (1), characterized in that: the automatic saw blade cutting machine is characterized in that a supporting box (2) is fixedly connected to the bottom of the workbench (1), a motor (3) is mounted on the surface of the supporting box (2), a first rotating rod (4) is fixedly connected to the output end of the motor (3), a saw blade (5) is mounted at the output end of the first rotating rod (4), a first groove (6) for placing the saw blade (5) is formed in the surface of the workbench (1), vertical plates (12) are symmetrically and fixedly connected to the bottom of the workbench (1), a first lead screw (7) is rotatably connected between the two vertical plates (12), a movable plate (9) is in threaded connection with the outer wall of the first lead screw (7), first supporting plates (10) are symmetrically arranged at two ends of the movable plate (9), a vacuum sucker (11) is arranged at the bottom of the first supporting plate (10), and guide rods (8) are fixedly connected between the vertical plates (12), the guide rod (8) penetrates through the moving plate (9), and the moving plate (9) is connected with the guide rod (8) in a sliding mode.

2. The fault-safe mechanical device of claim 1, wherein: a second screw rod (16) is rotatably connected between the vertical plates (12), the second screw rod (16) penetrates through the moving plate (9), the second screw rod (16) is in threaded connection with the moving plate (9), and the guide rod (8) is located between the first screw rod (7) and the second screw rod (16).

3. The fault-safe mechanical device of claim 2, wherein: the outer wall of the first screw rod (7) is coaxially and fixedly connected with a first chain wheel (13), the outer wall of the second screw rod (16) is coaxially and fixedly connected with a second chain wheel (14), and the first chain wheel (13) is in transmission connection with the second chain wheel (14) through a chain (15).

4. The fault-safe mechanical device of claim 3, wherein: the outer wall of the first rotating rod (4) is coaxially and fixedly connected with a first gear (17), the bottom of the first gear (17) is meshed with a second gear (18), the bottom of the second gear (18) is coaxially and fixedly connected with a first outer tube (19), a sliding rod (20) is arranged in the first outer tube (19), the bottom of the sliding rod (20) is coaxially and fixedly connected with a third gear (23), the outer wall of the first screw rod (7) is coaxially and fixedly connected with a fourth gear (24), and the fourth gear (24) is matched with the third gear (23).

5. The fault-safe mechanical device of claim 4, wherein: first spout (21) have been opened to the inner wall symmetry of first outer tube (19), sliding connection has slider (22) in first spout (21), slider (22) and slide bar (20) fixed connection, be provided with first spring (32) between first outer tube (19) and slide bar (20), first outer tube (19) run through supporting box (2), and first outer tube (19) rotate with supporting box (2) and be connected, first gear (17), second gear (18), third gear (23), fourth gear (24) are conical gear.

6. The fault-safe mechanical device of claim 5, wherein: the bottom symmetry fixedly connected with second backup pad (28) of workstation (1), two be connected with bracing piece (27) between second backup pad (28), be provided with press switch on bracing piece (27), press switch is used for the operation of control motor (3), it is provided with fly leaf (26) to slide on bracing piece (27), open on the surface of workstation (1) has second recess (35) that are used for placing fly leaf (26), open on the surface of fly leaf (26) has second spout (29), bracing piece (27) slide to set up in second spout (29), second fixed disk (33) fixedly connected with linking plate (25) are passed through to the bottom of fly leaf (26), slide bar (20) run through linking plate (25), and linking plate (25) and slide bar (20) fixed connection.

7. The machine of claim 6, further comprising a fail-safe feature, wherein: the upper end of fly leaf (26) is the hemisphere, the first fixed disk of bottom fixedly connected with (30) of second backup pad (28), be provided with second spring (34) between first fixed disk (30) and second fixed disk (33), open the surface of first fixed disk (30) has third spout (31), fly leaf (26) sliding connection is in third spout (31).

8. The fault-safe mechanical device of claim 1, wherein: the utility model discloses a saw blade dust collection box, including workstation (1), protection casing (38), connecting rod (47), suction fan (40), the air inlet end of suction fan (40) and protection casing (38) inner chamber link up each other, the air-out end of suction fan (40) is provided with dust collection box (41), still is connected with connecting rod (47) in one side of fly leaf (26), and the other end and protection casing (38) of connecting rod (47) are connected fixedly, protection casing (38) are located saw bit (5) top, the inner wall of protection casing (38) is provided with magnet (39), suction fan (40) are installed to the upper end of protection casing (38), the air inlet end and protection casing (38) inner chamber of suction fan (40) link up each other.