PCB cutting device with adjustable cutting angle

By designing a PCB board cutting device with an adjustable cutting angle, and utilizing a combination of adjustment components and grinding rollers, the problems of blade dulling and limited cutting shapes were solved, achieving efficient and flexible PCB board cutting and automatic grinding, thus improving production efficiency.

CN223685531UActive Publication Date: 2025-12-19阿博 (CHANGZHOU) MECHANICAL ENGINEERING TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202520264231.7
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-02-19
Publication Date
2025-12-19
Estimated Expiration
2035-02-19

AI Technical Summary

Technical Problem

The blades of existing PCB board cutting equipment become dull after prolonged use, affecting production efficiency and making it impossible to cut irregular shapes. Changing the blades requires stopping the machine during the production process, resulting in low overall production efficiency.

Method used

An adjustable PCB board cutting device was designed. The cutting angle can be flexibly adjusted by adjusting the components. Combined with the movement of the linear module and the threaded rod, it can cut any angle or even an arc. At the same time, a grinding roller is set to automatically grind the blades, avoiding downtime for maintenance.

Benefits of technology

It enables automatic blade sharpening without affecting normal cutting, improving production efficiency, enabling the cutting of complex-shaped PCBs, reducing downtime, and improving the overall efficiency of the production line.

✦ Generated by Eureka AI based on patent content.

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    Figure CN223685531U_ABST
Patent Text Reader

Abstract

The utility model relates to the related technical field of cutting equipment, and discloses a cutting angle adjustable PCB cutting device which comprises a main body assembly, the main body assembly comprises a first belt conveyor and a second belt conveyor, the conveying end of the first belt conveyor is arranged above the second belt conveyor, and a limiting piece and a fixing piece are further arranged above the first belt conveyor; one conveying end of the belt conveyor is further provided with an adjusting assembly. Through the arrangement of the adjusting assembly, when the cutting device is used for cutting, the movable disc is controlled by the first motor to rotate, movement in one direction is achieved through the first threaded rod, movement in the other direction is achieved through the linear module, meanwhile, the linear module can be driven by the first motor to rotate, and cutting of any angle appearance can be achieved under the cooperation of the movable disc, the linear module and the first motor. The problem that in an existing blade cutting scheme, a cutting blade can only fixedly cut a PCB with a single angle, and irregular shapes cannot be cut is solved.
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Description

TECHNICAL FIELD

[0001] The utility model relates to cutting equipment related technical field, concretely is a kind of PCB cutting device of cutting angle adjustable. BACKGROUND

[0002] PCB board, i.e. Printed Circuit Board, is one of important components of electronic industry, it is usually made of glass fiber or epoxy resin, provides mechanical support and insulation function. Like in common electronic products such as mobile phone, computer, the PCB board base material in its interior adopts glass fiber reinforced epoxy resin.

[0003] PCB board is mainly used for the production and use of various electronic components, since now electronic product shape is not one, its required size and shape are not one, especially for notebook computer mainboard production, it needs to reserve the placement radiator and battery part, this makes mainboard shape strange, needs to carry out multi-angle cutting to end part, in PCB board production line, since production quantity is large, production flow each aspect is connected more closely, since cutting assembly cutting blade can make cutting edge blunt after long time use, if on-site replacement blade needs to stop running entire workshop all equipment, greatly influence the overall production efficiency of PCB board, and if not timely replacement or polishing, then more PCB board burrs are cut out, even possibly cutting process causes damage.

[0004] For the problems in the related art, no effective solution has been proposed so far. CONTENT OF THE UTILITY MODEL

[0005] In view of the deficiency of prior art, the utility model provides a kind of PCB cutting device of cutting angle adjustable, the utility model is cut when being provided with adjusting assembly, movable disc is rotatable by motor one control, realizes one direction movement by threaded rod one, realizes its another direction movement by straight line module, can also realize its rotation under the driving of motor one, three cooperation, can realize the cutting of any angle shape, even including arc, solve the problem that cutting blade can only be fixedly cut to single angle PCB in the prior art cutting blade cutting scheme, cannot cut out irregular shape.

[0006] To solve the above technical problems, the utility model provides the following technical scheme:

[0007] The utility model provides a cutting angle adjustable PCB cutting device, including main body assembly, main body assembly includes belt conveyor no. 1 and belt conveyor no. 2, and the delivery end of belt conveyor no. 1 is set up above belt conveyor no. 2, and the upper side of belt conveyor no. 1 is also provided with limiting piece and fixed part, the delivery end of belt conveyor no. 1 is also provided with adjusting assembly, adjusting assembly includes the U-shaped frame fixed in the side of belt conveyor no. 1, the lower center of U-shaped frame horizontal arm is rotatably connected with movable disc, and the upper side of U-shaped frame is also fixed with motor no. 1, and the power axle of motor no. 1 penetrates U-shaped frame and is fixedly connected with movable disc, and the movable disc is rotatably connected with threaded rod no. 1, and the one end of movable disc is also fixed with motor no. 2, and the power axle of motor no. 2 is fixedly connected with threaded rod no. 1, and the side of threaded rod no. 1 is also screw connected with linear module, and linear module is in contact with movable disc, and the one end of connecting piece away from linear module is provided with cutting assembly.

[0008] Preferably, the limiting piece includes a limiting rod arranged above the belt conveyor no. 1, the side of the belt conveyor no. 1 is also fixed with a telescopic rod no. 2, the telescopic end of the telescopic rod no. 2 is fixedly connected with the limiting rod, the upper side of the belt conveyor no. 1 is also rotatably connected with a threaded rod no. 2, and the side of the belt conveyor no. 1 is also fixed with a motor no. 3, the power axle of the motor no. 3 is fixedly connected with the threaded rod no. 2.

[0009] Preferably, the limiting rod is provided with two, and the threaded rod no. 2 is a double-headed stud, and the two limiting rods are mirror image arranged on the opposite threads of the two sections of the threaded rod no. 2.

[0010] Preferably, the fixed part includes a fixed frame fixed to the side of the belt conveyor no. 1, the center of the fixed frame is fixedly connected with an electric hydraulic rod no. 2, and the telescopic end of the electric hydraulic rod no. 2 is fixed with a pressing plate no. 2.

[0011] Preferably, the lower surface of the pressing plate is bonded with a rubber pad.

[0012] Preferably, the belt conveyor no. 2 is provided with a dividing piece near the end of the belt conveyor no. 1, the side of the belt conveyor no. 2 is fixed with an electric hydraulic rod no. 1, and the telescopic end of the electric hydraulic rod no. 1 is fixed to the dividing piece.

[0013] Preferably, the cutting assembly includes a connecting frame fixed to the connecting piece, the connecting frame is provided with a transmission wheel set, the connecting frame is fixed with a power motor, the power axle of the power motor penetrates the connecting frame and is fixedly connected with one of the transmission wheels of the transmission wheel set, and the other transmission wheel of the transmission wheel set is also fixed with a cutting blade; the connecting frame is also fixed with an electric push rod, the telescopic end of the electric push rod is fixed with an L-shaped frame, the L-shaped frame is movably arranged on the connecting frame, and the two ends of the L-shaped frame are obliquely rotatably connected with polishing rollers, one end of the polishing rollers is movably connected with a plug-in sub-piece through a universal joint, the connecting frame is also fixed with a shell, the upper end wall of the shell is vertically rotatably connected with a plug-in female piece matched with the plug-in sub-piece, one end of the plug-in female piece inserted into the shell is fixed with a bevel gear, and the two bevel gears are meshed.

[0014] Compared with the prior art, the PCB cutting device with adjustable cutting angle has the following beneficial effects:

[0015] 1. The adjusting assembly is provided, the device cutting assembly is connected with the linear module through the connecting piece, the linear module can realize horizontal movement, the whole cutting part is arranged on the movable disc, the movable disc can rotate under the control of the motor, finally, one direction movement is realized through the threaded rod, the linear module realizes movement in another direction, and under the driving of the motor, rotation can also be realized, and through cooperation of the three, cutting of any angle shape can be realized, even including arc shape, the problem that the cutting blade in the existing blade cutting scheme can only fixedly cut the PCB board at a single angle and cannot cut irregular shapes is solved.

[0016] 2. The main body assembly is provided, when in use, the large-sized PCB board that has been preliminarily processed is placed on the belt conveyor one, then is driven by the belt conveyor one, in this process, the limiting piece can make it close to the center, the fixing piece fixes the PCB board, then the adjusting assembly cuts the end portion, in the cutting process, the dividing piece will be close to the belt conveyor two, this makes the cut-down PCB board waste fall to one end of the belt conveyor two, the position can be placed to collect the waste barrel, and after cutting is completed, the dividing piece moves to the direction of the belt conveyor one, the cut-down finished product PCB board will slide along the dividing piece and fall to the belt conveyor two, so that it can be normally conveyed, this makes the belt conveyor two can always convey the finished product PCB board after cutting, without reversing the belt to send waste, improves the conveying efficiency, and solves the problem that most of the existing PCB cutting devices need to cut each PCB board separately, and the production efficiency is low.

[0017] 3. The cutting assembly is provided, when the cutting blade needs to be polished for a long time, the L-shaped frame is driven downward by the electric push rod, the whole polishing roller is driven downward, the one end of the polishing roller is provided with the plug-in sub-piece, the plug-in sub-piece and the plug-in female piece are plugged, under the action of the bevel gear, the transmission wheel group drives the polishing roller to rotate, and after the plug-in sub-piece and the plug-in female piece are plugged during the downward movement of the polishing roller, the polishing roller is just attached to the edge of the cutting blade, at this time, the polishing roller is started, convenient for polishing and not affecting normal cutting, solving the problem that the cutting blade is blunt due to long time use, and the efficiency of the whole production process is affected when the cutting blade is replaced. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a whole structure schematic view of the utility model;

[0019] Figure 2 It is the structural schematic view of the belt conveyor one of the utility model;

[0020] Figure 3 It is the structural schematic view of the adjusting assembly of the utility model;

[0021] Figure 4 It is the structural schematic view of the adjusting assembly of the utility model from another perspective;

[0022] Figure 5 It is the structural schematic view of the cutting assembly of the utility model.

[0023] In the drawing,

[0024] 1, main body assembly;11, belt conveyor one;12, belt conveyor two;13, electric hydraulic rod one;14, dividing piece;15, limiting piece;151, limiting rod;152, telescopic rod;153, threaded rod two;154, motor three;16, fixed part;161, fixed frame;162, electric hydraulic rod two;163, extrusion plate;

[0025] 2, adjusting assembly;21, U-shaped frame;22, movable disc;23, motor one;24, threaded rod one;25, motor two;26, linear module;27, connecting piece;

[0026] 3, cutting assembly;31, connecting frame;32, transmission wheel set;33, power motor;34, cutting blade;35, electric push rod;36, L-shaped frame;37, polishing roller;38, shell;381, plug-in sub-piece;382, plug-in female piece;383, bevel gear. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0028] As introduced in the background, the deficiencies in the prior art exist, in order to solve the above technical problems, the application provides a PCB cutting device with adjustable cutting angle.

[0029] Please refer to Figure 1 - Figure 4The utility model provides a cutting angle adjustable PCB cutting device, including main part assembly 1, main part assembly 1 includes belt conveyor one 11 and belt conveyor two 12, and the delivery end of belt conveyor one 11 is set in the upper of belt conveyor two 12, and the upper of belt conveyor one 11 still is provided with limiting piece 15 and fixed part 16, the delivery end of belt conveyor one 11 still is provided with adjusting assembly 2, adjusting assembly 2 includes the U-shaped frame 21 fixed in the side body of belt conveyor one 11, and the lower center of U-shaped frame 21 horizontal arm is rotatably connected with movable disc 22, and the upper of U-shaped frame 21 still is fixed with motor one 23, and the power axle of motor one 23 penetrates U-shaped frame 21 and is fixedly connected with movable disc 22, and movable disc 22 is rotatably connected with threaded rod one 24, and the one end of movable disc 22 still is fixed with motor two 25, and the power axle of motor two 25 is fixedly connected with the one end of threaded rod one 24, and the threaded rod one 24 side is still screw connected with linear module 26, and linear module 26 is in contact with movable disc 22, and linear module 26 still movably connects with connecting piece 27, and the one end of connecting piece 27 away from linear module 26 is provided with cutting assembly 3.

[0030] When using the device, the large PCB board that has been preliminarily processed is placed on the belt conveyor one 11, then is driven by the belt conveyor one 11, when reaching the end, the belt conveyor one 11 stops moving, in the process, the limiting piece 15 can make it close to the center, then the electric hydraulic rod two 162 drives the extrusion plate 163 to move downward, so as to fix the PCB board, then the cutting assembly 3 is adjusted through the adjusting assembly 2, which is connected with the linear module 26 through the connecting piece 27, and can realize horizontal movement through the linear module 26, the motor two 25 drives the screw rod one to rotate, realizes the cutting assembly 3 another direction movement, facilitates cutting at different angles, at the same time, the whole cutting part is arranged on the movable disc 22, the movable disc 22 is rotatable controlled by the motor one 23, finally, realizes one direction movement through the threaded rod one 24, the linear module 26 realizes another direction movement, at the same time, can also realize rotation under the driving of the motor one 23, through the cooperation of the three, can realize cutting of any angle shape.

[0031] Further, the limiting piece 15 includes a limiting rod 151 arranged above the belt conveyor one 11, two telescopic rods 152 are fixed on the side of the belt conveyor one 11, the telescopic ends of the two telescopic rods 152 are fixedly connected with the limiting rod 151, a threaded rod two 153 is rotatably connected above the belt conveyor one 11, a motor three 154 is fixed on the side of the belt conveyor one 11, and the power axle of the motor three 154 is fixedly connected with the threaded rod two 153.

[0032] The limiting piece 15 is mainly used for limiting the end of the PCB board when the belt conveyor one 11 transports the PCB board, so that it can be close to the adjusting assembly 2 in the middle position and cut the end.

[0033] Further, the limiting rods 151 are provided with two, the threaded rod two 153 is a double-headed stud, and the two limiting rods 151 are mirror-imaged provided on the opposite threads of the two sections of the threaded rod two 153.

[0034] The two limiting rods 151 are provided in an outer eight shape, so that the PCB board moves along the limiting rods 151 under the action of the belt conveyor one 11, and the threaded rod two 153 can adjust the distance therebetween according to different models of circuit boards.

[0035] Further, the fixing member 16 includes a fixing frame 161 fixed to the side body of the belt conveyor one 11, and a second electric hydraulic rod 162 is fixed at the center of the fixing frame 161, and an extrusion plate 163 is fixed at the telescopic end of the second electric hydraulic rod 162; the extrusion plate 163 is used to press the fixed PCB board, so as to realize fixation and facilitate the cutting of the adjusting assembly 2.

[0036] Further, the lower surface of the extrusion plate 163 is bonded with a rubber pad, which is used to increase the friction and further improve the stability of the fixation, and at the same time prevent scratches on the PCB board during the extrusion fixation.

[0037] Further, the belt conveyor two 12 is provided with a dividing member 14 near the end of the belt conveyor one 11, and the side body of the belt conveyor two 12 is fixed with a first electric hydraulic rod 13, and the telescopic end of the first electric hydraulic rod 13 is fixed on the dividing member 14, and the dividing member 14 is used to divide the waste and the formed PCB board, and during the cutting process, the dividing member 14 will move towards the belt conveyor two 12, which makes the PCB board waste dropped by cutting slide to the end of the belt conveyor two 12, and its position can be placed in a waste bucket for collection, and after the cutting is completed, the dividing member 14 moves towards the belt conveyor one 11, and the cut finished PCB board will slide along the dividing member 14 and fall onto the belt conveyor two 12, so that it can be normally conveyed, which makes the belt conveyor two 12 can always convey the finished PCB board after cutting, without reversing the waste, and improves the conveying efficiency.

[0038] Further, the cutting assembly 3 comprises a connecting frame 31 fixed on the connecting piece 27, a transmission wheel set 32 is arranged on the connecting frame 31, a power motor 33 is fixed on the connecting frame 31, a power shaft of the power motor 33 penetrates through the connecting frame 31 and is fixedly connected with one of the transmission wheels of the transmission wheel set 32, a cutting blade 34 is also fixed on another transmission wheel of the transmission wheel set 32; an electric push rod 35 is also fixed on the connecting frame 31, an L-shaped frame 36 is fixed on the retractable end of the electric push rod 35, the L-shaped frame 36 is also movably arranged on the connecting frame 31, polishing rollers 37 are tiltably connected at both ends of the L-shaped frame 36, a plug-in sub 381 is movably connected with one end of the polishing roller 37 through a universal joint, a shell 38 is also fixed on the connecting frame 31, a plug-in female 382 matched with the plug-in sub 381 is vertically rotatably connected with an end wall of the shell 38, a bevel gear 383 is fixed on the end of the transmission wheel connected with the cutting blade 34 away from the cutting blade 34, the plug-in female 382 penetrates into the shell 38, and one end of the plug-in female 382 is fixed with the bevel gear 383, and the two bevel gears 383 are meshed.

[0039] The cutting assembly 3 of the device is mainly used for cutting the PCB board in all directions under the driving of the adjusting assembly 2. The device mainly cuts through the cooperation of the cutting blade 34, the transmission wheel set 32 and the power motor 33. Like the traditional cutting device, the difference is that the device is also provided with the polishing roller 37 which can polish the cutting blade 34. When the cutting blade 34 needs to be polished after long-time use, first, stop the rotation of the blade for a moment, then drive the L-shaped frame 36 to move downward through the electric push rod 35, drive the whole polishing roller 37 to move downward, the plug-in sub 381 is arranged at one end of the polishing roller 37, one of the transmission wheels of the transmission wheel set 32 is provided with a bevel gear 383, the plug-in female 382 matched with the plug-in sub 381 is rotatably connected with an end wall of the protective shell 38, and the plug-in female 382 is also fixed with a bevel gear 383, the two bevel gears 383 are meshed, when the polishing roller 37 moves downward, the plug-in sub 381 and the plug-in female 382 are plugged, under the action of the bevel gear 383, the transmission wheel of the transmission wheel set 32 rotates and finally drives the polishing roller 37 to rotate, and after the plug-in sub 381 and the plug-in female 382 are plugged, the polishing roller 37 is just attached to the edge of the cutting blade 34 during the downward movement of the polishing roller 37, at this time, the polishing roller 37 is started to facilitate polishing and does not affect normal cutting.

[0040] Working principle: when using the device, the large PCB board that has been preliminarily processed is placed on the belt conveyor 11, then it is driven by the belt conveyor 11, when it reaches the end of the belt conveyor 11, the belt conveyor 11 stops moving, in the process, the limiting part 15 can make it close to the center, then the electric hydraulic rod 162 drives the extrusion plate 163 to move downward, so as to fix the PCB board, then the adjusting assembly 2 is adjusted to cut the cutting assembly 3, which is connected with the linear module 26 through the connecting part 27, and can realize horizontal movement through the linear module 26, the motor 25 drives the screw rod 1 to rotate, realizes the movement of the cutting assembly 3 in another direction, which is convenient for cutting at different angles, at the same time, the whole cutting part is arranged on the movable disc 22, which is controlled by the motor 1 23 to rotate, finally, the threaded rod 1 24 realizes the movement in one direction, the linear module 26 realizes the movement in another direction, and can also realize rotation under the driving of the motor 1 23, the three cooperate to realize the cutting of any angle shape, even including arc, the cutting assembly 3 of the device is mainly used for cutting the PCB board, and the cutting assembly 3 will cut in all directions under the driving of the adjusting assembly 2, the device cuts mainly through the cooperation of the cutting blade 34, the transmission wheel set 32 and the power motor 33, like the traditional cutting device, the difference is that the device is also provided with the polishing roller 37 that can polish the cutting blade 34, when the cutting blade 34 needs to be polished after long time use, first stop the rotation of the blade for a moment, then push the L-shaped frame 36 downward through the electric push rod 35, drive the whole polishing roller 37 to move downward, the polishing roller 37 is provided with the plug-in sub 381 at one end, one of the transmission wheels of the transmission wheel set 32 is provided with the bevel gear 383, the protective shell 38 is rotatably connected with the plug-in female 382 that is matched with the plug-in sub 381, and the plug-in female 382 is also fixed with a bevel gear 383, the two bevel gears 383 are engaged, when the polishing roller 37 moves downward, the plug-in sub 381 and the plug-in female 382 are plugged, under the action of the bevel gear 383, the transmission wheel of the transmission wheel set 32 rotates to finally drive the polishing roller 37 to rotate, and after the plug-in sub 381 and the plug-in female 382 are plugged during the downward movement of the polishing roller 37, the polishing roller 37 is just attached to the edge of the cutting blade 34, at this time, the polishing roller 37 is started to facilitate polishing, and normal cutting use is not affected.

[0041] In the cutting process, the cutting member 14 approaches the second belt conveyor 12, so that the cut-off PCB waste falls on the second belt conveyor 12 and is collected by the waste barrel, and then the cutting member 14 moves towards the first belt conveyor 11, and the cut-off finished product PCB falls on the second belt conveyor 12 and is normally conveyed, so that the second belt conveyor 12 can always convey the finished product PCB without reversing and conveying waste, thereby improving the conveying efficiency.

[0042] Although the embodiments of the present application have been shown and described, it should be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A PCB cutting device with adjustable cutting angle, characterized in that: Including the main body assembly (1), the main body assembly (1) includes belt conveyor one (11) and belt conveyor two (12), the belt conveyor one (11) delivery end is arranged above the belt conveyor two (12), the belt conveyor one (11) above is further provided with a limiting piece (15) and a fixed part (16); The belt conveyor one (11) delivery end is further provided with an adjusting assembly (2), the adjusting assembly (2) includes a U-shaped frame (21) fixed to the side body of the belt conveyor one (11), the U-shaped frame (21) is rotatably connected with a movable disc (22) below the cross arm center, the U-shaped frame (21) is further fixed with a motor one (23) above, the motor one (23) power shaft penetrates the U-shaped frame (21) and is fixedly connected with the movable disc (22), the movable disc (22) is rotatably connected with a threaded rod one (24), the movable disc (22) one end is further fixed with a motor two (25), the motor two (25) power shaft is fixedly connected with one end of the threaded rod one (24), the threaded rod one (24) side surface is further threadedly connected with a linear module (26), the linear module (26) is in contact with the movable disc (22), the linear module (26) is further movably connected with a connecting piece (27), the connecting piece (27) is provided with a cutting assembly (3) away from one end of the linear module (26).

2. The PCB cutting device with adjustable cutting angle according to claim 1, characterized in that: The limiting piece (15) includes a limiting rod (151) arranged above the belt conveyor one (11), the side body of the belt conveyor one (11) is further fixed with two telescopic rods (152), the telescopic end of the telescopic rod (152) is fixedly connected with the limiting rod (151), the belt conveyor one (11) is further rotatably connected with a threaded rod two (153), the side body of the belt conveyor one (11) is further fixed with a motor three (154), the motor three (154) power shaft is fixedly connected with the threaded rod two (153).

3. The PCB cutting device with adjustable cutting angle according to claim 2, characterized in that: The limiting rod (151) is provided with two, the threaded rod two (153) is a double-headed stud, two limiting rods (151) are mirror image arranged on the opposite threads of the threaded rod two (153).

4. The PCB cutting device with adjustable cutting angle according to claim 3, characterized in that: The fixed part (16) includes a fixed frame (161) fixed to the side body of the belt conveyor one (11), the fixed frame (161) is fixedly connected with a second electric hydraulic rod (162) at the center, and the telescopic end of the second electric hydraulic rod (162) is fixedly connected with a pressing plate (163).

5. The PCB cutting device with adjustable cutting angle according to claim 4, characterized in that: The lower surface of the pressing plate (163) is bonded with a rubber pad.

6. The PCB cutting device with adjustable cutting angle according to claim 1, characterized in that: The belt conveyor two (12) is provided with a dividing piece (14) near the belt conveyor one (11) end, the side body of the belt conveyor two (12) is fixed with a first electric hydraulic rod (13), and the telescopic end of the first electric hydraulic rod (13) is fixed on the dividing piece (14).

7. The PCB cutting device with adjustable cutting angle according to claim 1, characterized in that: The cutting assembly (3) comprises a connecting frame (31) fixed on the connecting piece (27), a transmission wheel set (32) is arranged on the connecting frame (31), a power motor (33) is fixed on the connecting frame (31), a power shaft of the power motor (33) is fixedly connected with one of the transmission wheels of the transmission wheel set (32) and penetrates through the connecting frame (31), and a cutting blade (34) is further fixed on the other transmission wheel of the transmission wheel set (32); An electric push rod (35) is further fixed on the connecting frame (31), an L-shaped frame (36) is fixed on the telescopic end of the electric push rod (35), the L-shaped frame (36) is movably arranged on the connecting frame (31), polishing rollers (37) are tiltably connected to two ends of the L-shaped frame (36), a plug-in sub-piece (381) is movably connected to one end of the polishing roller (37) through a universal joint, a shell (38) is further fixed on the connecting frame (31), a plug-in female piece (382) matched with the plug-in sub-piece (381) is vertically rotatably connected to the upper end wall of the shell (38), a bevel gear (383) is fixed on the end of the transmission wheel connected with the cutting blade (34) and away from the cutting blade (34), the plug-in female piece (382) is provided with the bevel gear (383) at the end penetrating into the shell (38), and the two bevel gears (383) are meshed.