CN211220076U

CN211220076U - Cutting and grinding device of PCB cutting and grinding machine

Info

Publication number: CN211220076U
Application number: CN201922190430.5U
Authority: CN
Inventors: 朱剑戈; 向英鹏
Original assignee: Hangzhou Linan Longfei Electronic Co ltd
Current assignee: Hangzhou Linan Longfei Electronic Co ltd
Priority date: 2019-12-10
Filing date: 2019-12-10
Publication date: 2020-08-11
Anticipated expiration: 2029-12-10

Abstract

The utility model relates to the technical field of PCB board processing devices, in particular to a cutting and grinding device of a PCB board cutting and grinding machine, which can finish the cutting work of a PCB board at one time, and operators do not need to carry out secondary processing on the board, thereby saving time and labor, improving the working efficiency and improving the practicability; the power distribution box comprises a box body, a controller, the access door, the fixed slot, adjusting bolt and cloth of polishing, the box left end is provided with the PCB board input port, the box middle part is provided with the inner chamber, the controller is arranged in the box inner chamber, the box left end is provided with the access hole, first derailleur rear portion output passes the box and is connected with the initiative rod front end that changes, first motor top output power, the conveying roller both ends respectively with the inboard rotatable coupling of crossbeam, every group crossbeam bottom all is provided with two sets of supporting legs, the supporting leg top is connected with the crossbeam bottom, the crossbeam top is provided with the riser, the cloth of polishing can be to the operation of polishing of PCB flange, can adjust the height of cloth of polishing according to PCB plate.

Description

Cutting and grinding device of PCB cutting and grinding machine

Technical Field

The utility model relates to a PCB board processingequipment's technical field especially relates to a PCB cuts out cutting and grinding device of board edging machine.

Background

PCBs, i.e., printed wiring boards, are one of the important components of the electronics industry. Almost every kind of electronic equipment, as small as electronic watches, calculators, as large as computers, communication electronics, military weaponry systems, has electronic components such as integrated circuits, and printed boards are used to electrically interconnect the various components. The printed circuit board consists of an insulating bottom plate, a connecting lead and a welding disc for assembling and welding electronic elements, and has double functions of a conductive circuit and the insulating bottom plate. The circuit can replace complex wiring to realize electrical connection among elements in the circuit, thereby simplifying the assembly and welding work of electronic products, reducing the wiring workload in the traditional mode and greatly lightening the labor intensity of workers; and the volume of the whole machine is reduced, the product cost is reduced, and the quality and the reliability of the electronic equipment are improved. In the PCB processing process, processing procedures such as cutting and polishing are involved, the traditional operation method is to cut the PCB into small plates by using a cutting machine, and then polish and process the small plates, so the operation flow is complex, the production efficiency is reduced, and the practicability is not high.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a can once accomplish the work of cutting of PCB board, operating personnel needn't carry out secondary operation to the board, and labour saving and time saving improves work efficiency, has improved the cut-out mill device of PCB cut-out board edging machine of practicality.

The utility model relates to a cutting and grinding device of a PCB cutting edge grinding machine, which comprises a box body, a controller, an access door, a hinge, a driven rotating roller, a driving rotating roller, a first motor, a first speed changer, a top beam, a first cylinder, a first piston, a second motor, a transmission rod, a cutting disc, a cross beam, a vertical plate, a second cylinder, a second piston, a fixed groove, an adjusting bolt and a grinding cloth, wherein the left end of the box body is provided with a PCB input port, the middle part of the box body is provided with an inner cavity, the controller is positioned in the inner cavity of the box body, the left end of the box body is provided with an access hole, the access door covers the access hole, the access door is rotatably connected with the left end of the box body through the hinge, two leaves of the hinge are respectively connected with the left end of the box body and the left end of the access door, the driven rotating roller and the driving rotating roller are positioned in the inner cavity of the box body, the two ends, the front end of the box body is internally provided with a supporting plate, the rear end of the supporting plate is connected with the front end of the box body, the bottom end of a first motor is connected with the top end of the supporting plate, the first motor is electrically connected with a controller, the top output end of the first motor is connected with the bottom input end of a first speed changer, the rear output end of the first speed changer penetrates through the box body to be connected with the front end of a driving rotary rod, the top end of the first motor outputs power, the driving rotary rod is driven to rotate by the first speed changer, a PCB is positioned between the driven rotary rod and the driving rotary rod, the PCB is conveyed rightwards under the extrusion of the driven rotary rod and the driving rotary rod, the bottom end of a top beam is connected with the top end of a first air cylinder, the bottom end of the first air cylinder is connected with an air pump, the bottom end of the first air cylinder is slidably connected with the top end of a first piston, the left end of the first piston is connected, the right end of a second motor outputs power, the cutting disc is driven to rotate at high speed through a transmission rod, a plurality of groups of conveying rollers are arranged between two groups of parallel cross beams, two ends of each conveying roller are respectively rotatably connected with the inner sides of the cross beams, two groups of supporting legs are arranged at the bottom end of each group of cross beams, the top ends of the supporting legs are connected with the bottom ends of the cross beams, vertical plates are arranged at the top ends of the cross beams, the bottom ends of the vertical plates are connected with the top ends of the cross beams, the rear ends of a second cylinder are connected with the front ends of vertical plates, the rear ends of a second piston penetrate through the vertical plates to be connected with the front ends of fixed grooves, a plurality of groups of threaded holes are arranged at the top ends of the fixed, the polishing cloth can polish the edges of the PCB, and the height of the polishing cloth can be adjusted according to the thickness of the PCB by rotating the adjusting bolt.

The utility model discloses a PCB cuts out sanction of board edging machine grinds device is provided with the adjustment tank on the wall of two back both sides of box respectively, and from the adjustment tank of passing respectively at the rod both ends of changeing and being connected with the nut cooperation, swivel nut can fix from the rod of changeing on from the rod of changeing.

The utility model discloses a PCB cuts out sanction of board edging machine grinds device still includes third cylinder, third piston and clamp plate, and the third cylinder top is connected with the back timber bottom, third piston top and third cylinder bottom sliding connection, and third piston bottom is connected with the clamp plate top.

The utility model discloses a PCB cuts out sanction of board edging machine grinds device, first piston right-hand member are provided with the protection casing, and the protection casing left end is connected with first piston right-hand member, and partial cutting dish is located the protection casing.

The utility model discloses a PCB cuts out sanction of board edging machine grinds device still includes first screw rod and first backing plate, and the box bottom is provided with the multiunit regulating block, and the regulating block top is connected with the box bottom, and the regulating block bottom is provided with the screw hole, and first screw rod top is connected with regulating block bottom screw hole cooperation, but first screw rod bottom and first backing plate top swivelling joint.

The utility model discloses a PCB cuts out sanction mill device of board edging machine, the rotary rod top is provided with the screw hole, and second screw rod bottom is connected with rotary rod top screw hole cooperation, and the second screw rod top is connected with the supporting leg bottom, and the cloth bottom of polishing and second backing plate top rotatable coupling rotate the height of the adjustable second screw rod of rotary rod.

The utility model discloses a PCB cuts out sanction of board edging machine grinds device, the backup pad bottom is provided with the strengthening rib, and the strengthening rib top is connected with the backup pad bottom, and the strengthening rib rear end is connected with the box front end.

The utility model discloses a PCB cuts out sanction of board edging machine grinds device sets the shock pad to first backing plate.

Compared with the prior art, the beneficial effects of the utility model are that: enter into the box inner chamber with the PCB board through box left end PCB board input port, pass through between the driven rod that changes and the initiative rod that changes, start first motor, first motor top output, it is rotatory to change the rod through first derailleur drive initiative, the PCB board is located the driven rod that changes and the initiative is changeed between the rod, under the extrusion of the driven rod that changes and the initiative rod that changes, the PCB board conveys right, the PCB board enters into the polishing cloth after box right-hand member output, adjust the thickness of polishing cloth according to the rotatory adjusting bolt of PCB plate thickness, after PCB removes certain length, start first cylinder, the second motor moves down along with first piston, utilize the cutting disc to cut the PCB board, through setting up above device, can once accomplish the work of cutting the PCB board, operating personnel needn't carry out secondary operation to the board, time saving and labor saving, and work efficiency is improved, and practicability is improved.

Drawings

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

fig. 2 is a schematic front view of the present invention;

fig. 3 is a schematic top view of the present invention;

fig. 4 is a left side view structure diagram of the present invention;

fig. 5 is a schematic structural diagram of the cutting mechanism of the present invention;

FIG. 6 is a schematic structural view of the polishing mechanism of the present invention;

in the drawings, the reference numbers: 1. a box body; 2. a controller; 3. an access door; 4. a hinge; 5. a driven rotary rod; 6. actively rotating the strands; 7. a support plate; 8. a first motor; 9. a first transmission; 10. a top beam; 11. a first cylinder; 12. a first piston; 13. a second motor; 14. a transmission rod; 15. cutting the disc; 16. a cross beam; 17. a conveying roller; 18. supporting legs; 19. a vertical plate; 20. a second cylinder; 21. a second piston; 22. fixing grooves; 23. adjusting the bolt; 24. polishing cloth; 25. an adjustment groove; 26. a nut; 27. a third cylinder; 28. a third piston; 29. pressing a plate; 30. a protective cover; 31. an adjusting block; 32. a first screw; 33. a first backing plate; 34. rotating the rod; 35. a second screw; 36. a second backing plate; 37. and (5) reinforcing ribs.

Detailed Description

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

As shown in figures 1 to 6, the cutting and grinding device of the PCB cutting and grinding machine of the utility model comprises a box body 1, a controller 2, an access door 3, a hinge 4, a driven rotating roller 5, a driving rotating roller 6, a first motor 8, a first speed changer 9, a top beam 10, a first cylinder 11, a first piston 12, a second motor 13, a transmission rod 14, a cutting disc 15, a cross beam 16, a vertical plate 19, a second cylinder 20, a second piston 21, a fixed groove 22, an adjusting bolt 23 and a grinding cloth 24, wherein the left end of the box body 1 is provided with a PCB input port, the middle part of the box body 1 is provided with an inner cavity, the controller 2 is positioned in the inner cavity of the box body 1, the left end of the box body 1 is provided with an access hole, the access door 3 covers the access hole, the access door 3 is rotatably connected with the left end of the box body 1 through the hinge 4, two leaves of the hinge 4 are respectively connected with the left ends of the box body 1 and the access door 3, two ends of a driven rotating rod 5 and a driving rotating rod 6 are respectively rotatably connected with two side walls of an inner cavity of a box body 1, a PCB is positioned between the driven rotating rod 5 and the driving rotating rod 6, a supporting plate 7 is arranged in the front end of the box body 1, the rear end of the supporting plate 7 is connected with the front end of the box body 1, the bottom end of a first motor 8 is connected with the top end of the supporting plate 7, the first motor 8 is electrically connected with a controller 2, the top output end of the first motor 8 is connected with the bottom input end of a first speed changer 9, the rear output end of the first speed changer 9 penetrates through the box body 1 to be connected with the front end of the driving rotating rod 6, the top end of the first motor 8 outputs power, the driving rotating rod 6 is driven to rotate by the first speed changer 9, the PCB is positioned between the driven rotating rod 5 and the driving rotating rod 6, the PCB is conveyed rightwards under the extrusion of the driven rotating rod 5 and the driving, the bottom end of a first cylinder 11 is connected with the top end of a first piston 12 in a sliding way, the left end of the first piston 12 is connected with the right end of a second motor 13, the second motor 13 is connected with a power supply, the right output end of the second motor 13 is connected with the left end of a transmission rod 14, the right end of the transmission rod 14 passes through the first piston 12 and is connected with the left end of a cutting disc 15, the right end of the second motor 13 outputs power, the cutting disc 15 is driven to rotate at high speed through the transmission rod 14, a plurality of groups of conveying rollers 17 are arranged between two groups of parallel cross beams 16, both ends of the conveying rollers 17 are respectively connected with the inner sides of the cross beams 16 in a rotating way, the bottom end of each group of cross beams 16 is provided with two groups of supporting legs 18, the top ends of the supporting legs 18 are connected with the bottom end of the cross beams 16, the top end of the cross beam 16 is provided with a vertical plate 19, the bottom end of the vertical plate 19, a plurality of groups of threaded holes are formed in the top end of the fixing groove 22, a groove is formed in the right end of the fixing groove 22, the bottom end of the adjusting bolt 23 is connected with the threaded holes in a matched mode, the polishing cloth 24 is located in the groove in the right end of the fixing groove 22, after the PCB passes through the polishing cloth 24, the polishing cloth 24 can polish the edge of the PCB, and the height of the polishing cloth 24 can be adjusted according to the thickness of the PCB through rotation of the adjusting bolt 23; the PCB enters the inner cavity of the box body 1 through the PCB input port at the left end of the box body 1, passes through between the driven rotating roller 5 and the driving rotating roller 6, the first motor 8 is started, the top end of the first motor 8 outputs power, the driving rotating roller 6 is driven to rotate through the first speed changer 9, the PCB is positioned between the driven rotating roller 5 and the driving rotating roller 6, the PCB is extruded by the driven rotating roller 5 and the driving rotating roller 6 and is conveyed to the right, the PCB is output from the right end of the box body 1 and then enters the polishing cloth 24, the thickness of the polishing cloth 24 is adjusted by rotating the adjusting bolt 23 according to the thickness of the PCB, then after the PCB moves for a certain length, the first air cylinder 11 is started, the second motor 13 moves downwards along with the first piston 12, the PCB is cut by the cutting disc 15, through the device, the cutting work of the PCB can be finished at one time, operators do not need to carry out secondary processing on the board, time and, the working efficiency is improved, and the practicability is improved.

The utility model discloses a cutting and grinding device of PCB cutting edge grinding machine, the front and back side walls of the box body 1 are respectively provided with an adjusting groove 25, the two ends of the driven rotating rod 5 respectively pass through the adjusting grooves 25 to be matched and connected with a nut 26, and the driven rotating rod 5 can be fixed on the driven rotating rod 5 by rotating the nut 26; by providing the adjustment groove 25 and the nut 26, the operator can adjust the position of the driven rotary rod 5 according to the thickness of the plate, and the versatility is improved.

The utility model discloses a cutting and grinding device of PCB cutting and grinding machine, still include third cylinder 27, third piston 28 and clamp plate 29, the top of third cylinder 27 is connected with top beam 10 bottom, the top of third piston 28 is connected with third cylinder 27 bottom, the bottom of third piston 28 is connected with clamp plate 29 top; through setting up above closing device, can start third cylinder 27 when the PCB board cutting, clamp plate 29 pushes down along with third piston 28, makes clamp plate 29 compress tightly the PCB board, prevents that the PCB board aversion among the cutting process has improved the fixity.

The utility model discloses a cutting and grinding device of a PCB cutting and grinding machine, a protection cover 30 is arranged at the right end of a first piston 12, the left end of the protection cover 30 is connected with the right end of the first piston 12, and a part of a cutting disc 15 is positioned in the protection cover 30; through setting up protection casing 30, can prevent in the operation process that debris from by the cutting of fast turn's cutting disc 15, cause the unnecessary loss, improved the protectiveness.

The utility model discloses a cutting and grinding device of PCB cutting edge grinding machine, still include first screw rod 32 and first backing plate 33, the box 1 bottom is provided with multiunit regulating block 31, the regulating block 31 top is connected with the box 1 bottom, the regulating block 31 bottom is provided with the screw hole, the first screw rod 32 top is connected with the regulating block 31 bottom screw hole cooperation, the first screw rod 32 bottom is connected with the first backing plate 33 top is rotatable; through setting up above adjusting device, can rotate first screw rod 32 and adjust the height of regulating block 31 after the device takes one's place to make the device be in the horizontality, improved the practicality.

The utility model discloses a cutting and grinding device of PCB cutting edge grinding machine, the top of the rotary rod 34 is provided with a threaded hole, the bottom of the second screw 35 is connected with the threaded hole at the top of the rotary rod 34 in a matching way, the top of the second screw 35 is connected with the bottom of the supporting leg 18, the bottom of the grinding cloth 24 is connected with the top of the second backing plate 36 in a rotating way, and the rotary rod 34 can adjust the height of the second screw 35; through setting up above adjusting device, can adjust the height of crossbeam 16 according to the height and the thickness of PCB board, the mill of being convenient for is cut the work and is gone on, has improved the practicality.

The utility model discloses a cutting and grinding device of a PCB cutting and grinding machine, the bottom end of a supporting plate 7 is provided with a reinforcing rib 37, the top end of the reinforcing rib 37 is connected with the bottom end of the supporting plate 7, and the rear end of the reinforcing rib 37 is connected with the front end of a box body 1; through setting up strengthening rib 37, can provide the holding power for backup pad 7, prevent that backup pad 7 and box 1 junction from taking place the rupture, improved the steadiness.

The cutting and grinding device of the PCB cutting and grinding machine of the utility model sets the first backing plate 33 as a shock pad; the conveying device can vibrate during operation, the damage to the device is large, the first base plate 33 is arranged to be the shock absorption pad, vibration generated by partial devices can be absorbed, the service life of the device is prolonged, and the practicability is improved.

The utility model discloses a cutting and grinding device of PCB cutting edge grinding machine, when it works, firstly the operator rotates the first screw 32 to adjust the box 1 to the horizontal state, then the height of the crossbeam 16 is adjusted to the appropriate state according to the height of the PCB and the thickness rotation rotary rod 34, then the PCB enters the inner cavity of the box 1 through the PCB input port at the left end of the box 1, the PCB passes between the driven rotary rod 5 and the driving rotary rod 6, the first motor 8 is started, the top end output power of the first motor 8 drives the driving rotary rod 6 to rotate through the first speed changer 9, the PCB is positioned between the driven rotary rod 5 and the driving rotary rod 6, under the extrusion of the driven rotary rod 5 and the driving rotary rod 6, the PCB is conveyed rightwards, the PCB enters the grinding cloth 24 after being output from the right end of the box 1, the thickness of the grinding cloth 24 is adjusted according to the PCB thickness rotation adjusting bolt 23, then after the PCB moves a certain length, and starting the third air cylinder 27, pressing the pressing plate 29 to press down along with the third piston 28, so that the pressing plate 29 presses the PCB, then starting the first air cylinder 11, moving the second motor 13 downwards along with the first piston 12, and cutting the PCB by using the cutting disc 15.

The cutting and grinding device of the PCB cutting and grinding machine of the utility model adopts a common mechanical mode, such as an installation mode, a connection mode or a setting mode, and can be implemented as long as the beneficial effects are achieved; the utility model discloses a PCB cuts out motor, derailleur and the cylinder of cutting out the mill device of board edging machine is purchase on the market, and this technical staff in the industry only need according to its subsidiary instructions install and operate can.

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

Claims

1. A cutting and grinding device of a PCB cutting and grinding machine is characterized by comprising a box body (1), a controller (2), an access door (3), a hinge (4), a driven rotary rod (5), a driving rotary rod (6), a first motor (8), a first speed changer (9), a top beam (10), a first cylinder (11), a first piston (12), a second motor (13), a transmission rod (14), a cutting disc (15), a cross beam (16), a vertical plate (19), a second cylinder (20), a second piston (21), a fixing groove (22), an adjusting bolt (23) and grinding cloth (24), wherein a PCB input port is arranged at the left end of the box body (1), an inner cavity is arranged in the middle of the box body (1), the controller (2) is positioned in the inner cavity of the box body (1), the access port is arranged at the left end of the box body (1), the access door (3) covers the access port, the access door (3) is rotatably connected with the left end of the box body (1) through the hinge (4), the right end of the hinge (4) is respectively connected with the left ends of the box body (1) and the access door (3), the driven rotating roller (5) and the driving rotating roller (6) are positioned in the inner cavity of the box body (1), the two ends of the driven rotating roller (5) and the driving rotating roller (6) are respectively rotatably connected with the two side walls of the inner cavity of the box body (1), the PCB is positioned between the driven rotating roller (5) and the driving rotating roller (6), a support plate (7) is arranged in the front end of the box body (1), the rear end of the support plate (7) is connected with the front end of the box body (1), the bottom end of the first motor (8) is connected with the top end of the support plate (7), the first motor (8) is electrically connected with the controller (2), the top output end of the first motor (8) is connected with the bottom input end of the first speed changer (9), the rear output end of the first speed changer (9) penetrates through the box body (1) to be, the driving rotary rod (6) is driven to rotate through a first speed changer (9), the PCB is positioned between the driven rotary rod (5) and the driving rotary rod (6), under the extrusion of the driven rotary rod (5) and the driving rotary rod (6), the PCB is conveyed to the right, the bottom end of a top beam (10) is connected with the top end of a first air cylinder (11), the first air cylinder (11) is connected with an air pump, the bottom end of the first air cylinder (11) is connected with the top end of a first piston (12) in a sliding way, the left end of the first piston (12) is connected with the right end of a second motor (13), the second motor (13) is connected with a power supply, the right output end of the second motor (13) is connected with the left end of a transmission rod (14), the right end of the transmission rod (14) penetrates through the first piston (12) to be connected with the left end of a cutting disc (15), the right end of the second motor (13) outputs power, the transmission rod (14) drives the cutting disc (15) to rotate at high speed, and, both ends of a conveying roller (17) are respectively rotatably connected with the inner side of a cross beam (16), two groups of supporting legs (18) are arranged at the bottom end of each group of cross beams (16), the top ends of the supporting legs (18) are connected with the bottom end of the cross beam (16), a vertical plate (19) is arranged at the top end of the cross beam (16), the bottom end of the vertical plate (19) is connected with the top end of the cross beam (16), the rear end of a second cylinder (20) is connected with the front end of the vertical plate (19), the rear end of the second piston (21) passes through the vertical plate (19) to be connected with the front end of a fixed groove (22), a plurality of groups of threaded holes are arranged at the top end of the fixed groove (22), a groove is arranged at the right end of the fixed groove (22), the bottom end of an adjusting bolt (23) is connected with the threaded holes in a matched manner, the polishing cloth (24) is positioned in the groove at the right end of the, the height of the polishing cloth (24) can be adjusted according to the thickness of the PCB by rotating the adjusting bolt (23).

2. The cutting device of the PCB cutting edge grinding machine according to claim 1, wherein the two sides of the box body (1) are provided with adjusting grooves (25), the two ends of the driven rotating stick (5) respectively penetrate through the adjusting grooves (25) to be matched and connected with nuts (26), and the driven rotating stick (5) can be fixed on the driven rotating stick (5) by rotating the nuts (26).

3. The cutting and grinding device of the PCB cutting and grinding machine according to claim 2, further comprising a third cylinder (27), a third piston (28) and a pressing plate (29), wherein the top end of the third cylinder (27) is connected with the bottom end of the top beam (10), the top end of the third piston (28) is slidably connected with the bottom end of the third cylinder (27), and the bottom end of the third piston (28) is connected with the top end of the pressing plate (29).

4. The cutting and grinding device of the PCB cutting and grinding machine according to claim 3, characterized in that the right end of the first piston (12) is provided with a protective cover (30), the left end of the protective cover (30) is connected with the right end of the first piston (12), and part of the cutting disc (15) is positioned in the protective cover (30).

5. The cutting and grinding device of the PCB cutting and edging machine according to claim 4, further comprising a first screw (32) and a first backing plate (33), wherein a plurality of groups of adjusting blocks (31) are arranged at the bottom end of the box body (1), the top ends of the adjusting blocks (31) are connected with the bottom end of the box body (1), threaded holes are arranged at the bottom end of the adjusting blocks (31), the top end of the first screw (32) is connected with the threaded holes at the bottom end of the adjusting blocks (31) in a matching manner, and the bottom end of the first screw (32) is rotatably connected with the top end of the first backing plate (33).

6. The cutting and grinding device of the PCB cutting and grinding machine according to claim 5, characterized in that the top end of the rotating rod (34) is provided with a threaded hole, the bottom end of the second screw rod (35) is connected with the threaded hole at the top end of the rotating rod (34) in a matching way, the top end of the second screw rod (35) is connected with the bottom end of the supporting leg (18), the bottom end of the grinding cloth (24) is rotatably connected with the top end of the second backing plate (36), and the rotating rod (34) can adjust the height of the second screw rod (35).

7. The cutting device of the PCB cutting edge grinding machine according to claim 6, characterized in that the bottom end of the supporting plate (7) is provided with a reinforcing rib (37), the top end of the reinforcing rib (37) is connected with the bottom end of the supporting plate (7), and the rear end of the reinforcing rib (37) is connected with the front end of the box body (1).

8. A cutting and grinding device of a PCB cutting and grinding machine as claimed in claim 7, characterized in that the first backing plate (33) is provided as a shock-absorbing pad.