A non-contact length measuring gypsum board cutting system

Abstract

The present invention discloses a contactless length-measuring gypsum board cutter system, comprising a cutter body and a driving part driving the cutter body to rotate in a circle, and the cutting of the gypsum board is completed when the circular motion trajectory of the horizontally transported gypsum board and the blade of the cutter body are tangent; the end of the cutter body in the width direction is provided with a conveying follower component and a light source projector and a receiver installed on the conveying follower component; the conveying follower component is used to convert the horizontal movement state of the gypsum board conveyance into a synchronous circular rotation state, and the light source projector, driven by the conveying follower component, makes the light source generated by the light source projector propagate to the surface of the gypsum board at the cut-off point; wherein, the receiver is used to provide a trigger signal for the driving part to drive the blade of the cutter body to contact the surface of the gypsum board when the angle between the light source path projected by the light source projector and the vertical direction reaches a set value.

Description

Technical Field

[0001] The invention relates to the technical field of gypsum board production, and in particular to a gypsum board cutting knife system with contactless length measurement. Background Art

[0002] Nowadays, we mostly use the encoder to connect the measuring wheel to determine the length that the cutter should cut in the two-control cutting of gypsum board, and adopt the straight up and down cutter driven cutting method in the process of cutting the gypsum board. In the straight up and down knife cutting method, when the knife body contacts the gypsum board, the gypsum board needs to stop conveying or convey as little as possible. The stop action affects the cutting efficiency of the gypsum board. The cutting action includes the process of cutting the gypsum board and the return stroke of the knife. In the process of retracting the knife, the side of the gypsum board will rub against the surface of the knife body. When the knife body retreats to the upper part of the side of the gypsum board, if the gypsum board is conveyed at this time, it is easy to cause the knife body to damage the top edge of the side of the gypsum board.

[0003] Of course, in the actual process, the timing of restarting the gypsum board may be later than the reverse stroke of the knife body, that is, the gypsum board transportation may be started only when the knife body is completely separated from the gypsum board. This makes the control of the cutting process more precise and more complicated. Summary of the invention

[0004] The object of the present invention is to provide a contactless length measuring gypsum board cutter system to solve the technical problem in the prior art that the existing straight up and down cutters are triggered by the cutter stroke during the gypsum board cutting process.

[0005] In order to solve the above technical problems, the present invention specifically provides the following technical solutions:

[0006] A non-contact length measuring gypsum board cutting system, comprising:

[0007] A cutter body and a driving part driving the cutter body to rotate in a circular motion, and the cutting of the gypsum board is completed when the horizontally transported gypsum board and the circular motion trajectory of the blade of the cutter body are tangent;

[0008] The cutter body is provided with a conveying follower assembly and a light source projector and a receiver installed on the conveying follower assembly at the end in the width direction; the conveying follower assembly is used to convert the horizontal movement state of the gypsum board conveying into its own circular rotation state, and the light source projector is driven by the conveying follower assembly so that the light source generated by the light source projector is transmitted to the surface of the gypsum board cut;

[0009] The receiver is used to provide a trigger signal for the driving unit to drive the blade of the cutter body to contact the surface of the gypsum board when the angle between the light source path projected by the light source projector and the vertical direction reaches a set value.

[0010] As a preferred solution of the present invention, the trajectory of the cutting blade of the cutter body driven by the driving unit to rotate in a circular motion includes:

[0011] The blade of the cutter body starts to contact the surface of the gypsum board until the first rotation trajectory of the cutting action is completed;

[0012] a second rotation trajectory from the blade of the cutter body completing the cutting action to the drive unit driving the blade of the cutter body to contact the surface of the gypsum board next time;

[0013] Among them, the light source projector starts to project onto the surface of the cut gypsum board at the end of the first rotation trajectory, and the time when the driving unit drives the blade of the cutter body to perform the second rotation trajectory is the same as the time when the angle between the light source path projected by the light source projector and the vertical direction reaches a set value.

[0014] As a preferred solution of the present invention, the time that the driving unit drives the blade of the cutter body to perform the second rotation trajectory is less than the time that the angle between the light source path projected by the light source projector and the vertical direction reaches a set value, and when the driving unit drives the blade of the cutter body to reach the starting end of the first rotation trajectory, the driving unit stops.

[0015] As a preferred solution of the present invention, the conveying following component includes a servo motor and an angle wheel; wherein, the light source projector is arranged on the radius of the angle wheel along the radial direction of the angle wheel, and the servo motor drives the angle wheel to rotate following the rate of gypsum board conveying.

[0016] As a preferred solution of the present invention, a plurality of light source projectors are evenly distributed on the radius of the angle wheel, and the receiver is arranged on the side of each of the light source projectors. After the servo motor drives the angle wheel to reach a set rotation angle, a trigger working signal of the light source projector of the next group of vertical gypsum boards is generated; wherein, the servo motor drives the angle wheel to rotate unidirectionally.

[0017] As a preferred embodiment of the present invention, the light source projector generates at least two groups of infrared lights along the radial direction of the angle wheel, one group of infrared lights is located outside the boundary of the cutoff point of the gypsum board, and the other group of infrared lights is located inside the boundary of the cutoff point of the gypsum board.

[0018] As a preferred solution of the present invention, the light source projector includes a first infrared light unit, a second infrared light unit and a third infrared light unit, the infrared light projected by the first infrared light unit is located outside the boundary of the cut portion of the gypsum board, the infrared light projected by the second infrared light unit is located within the boundary of the cut portion of the gypsum board, and the infrared light projected by the third infrared light unit is located outside the side edge of the gypsum board; wherein a signal receiver for receiving the infrared light projected by the third infrared light unit is provided on the conveying channel of the gypsum board.

[0019] As a preferred solution of the present invention, the cutter body comprises an upper rotary cutter located above the gypsum board conveying plane and a lower rotary cutter located below the gypsum board conveying plane, and the upper rotary cutter and the lower rotary cutter each comprise a roller shaft and a cutter body mounted on the roller shaft rod along the length direction of the roller shaft;

[0020] Both ends of the roller shaft are provided with a retreat damping device, and the retreat damping device is used to make the roller shaft as a whole move upward first and then downward when the driving part drives the blade of the knife body to move along a first rotation trajectory.

[0021] As a preferred embodiment of the present invention, the retreat and shock absorbing device includes a ring bracket installed at both ends of the cutter body, a first guide shaft vertically passing through the upper part of the ring bracket, and a second guide shaft vertically passing through the lower part of the ring bracket, the first guide shaft and the second guide shaft are movably mounted together, and the part where the first guide shaft is connected to the second guide shaft is mounted with a spring, and the shaft bodies of the first guide shaft and the second guide shaft are both provided with roller bearings, the end of the roller shaft of the upper rotating cutter is installed on the first guide shaft through a roller bearing, and the end of the roller shaft of the lower rotating cutter is installed on the second guide shaft through a roller bearing; a servo 1 connected to the first guide bearing is provided at the top of the ring bracket, and a servo 2 connected to the second guide bearing is provided at the bottom of the ring bracket.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The cutter system of the present invention improves the existing straight up and down cutting of the knife body into a circular rotation cutting method, so that the gypsum board is cut when the trajectory of the circular motion of the horizontally transported gypsum board and the blade of the cutter body are tangent. During the cutting process, the cutter reduces the transportation obstruction of the gypsum board. At the same time, the contactless length measurement method makes the drive trigger of the cutter more accurate and rapid, reduces the decoding conversion process, and is more accurate in controlling the cutting timing. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0025] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention;

[0026] Figure 2 A schematic diagram of a first rotation trajectory and a second rotation trajectory of a cutter body according to an embodiment of the present invention;

[0027] Figure 3 It is a schematic diagram of the structure of a conveying follower component according to an embodiment of the present invention;

[0028] Figure 4 The diagram is a structural diagram of a light path generated by a light source projector according to an embodiment of the present invention when in operation.

[0029] The numbers in the figure represent the following:

[0030] 1-cutter body; 2-gypsum board; 3-conveying follower assembly; 4-light source projector; 5-receiver; 6-first rotation track; 7-second rotation track; 8-retreating damping device; 9-signal receiver; 10-third infrared light unit; 11-second infrared light unit; 12-first infrared light unit;

[0031] 101- roller shaft; 102- knife body;

[0032] 31-servo motor; 32-angle wheel;

[0033] 81-ring bracket; 82-first guide shaft; 83-second guide shaft; 84-spring; 85-roller bearing; 86-servo one; 87-servo two. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the present invention provides a non-contact length measuring gypsum board cutting knife system, comprising:

[0036] A cutter body 1 and a driving part for driving the cutter body 1 to rotate in a circular motion, and the cutting of the gypsum board is completed when the trajectory of the circular motion of the horizontally transported gypsum board and the blade of the cutter body 1 are tangent;

[0037] The end of the cutter body 1 in the width direction is provided with a conveying follower component 3 and a light source projector 4 and a receiver 5 installed on the conveying follower component 3; the conveying follower component 3 is used to convert the horizontal movement state of the gypsum board conveying into its own circular rotation state, and the light source projector 4 is driven by the conveying follower component 3 so that the light source generated by the light source projector 4 is transmitted to the surface of the gypsum board cut;

[0038] The receiver 5 is used to provide a trigger signal for the driving unit to drive the blade of the cutter body 1 to contact the surface of the gypsum board when the angle between the light source path projected by the light source projector 4 and the vertical direction reaches a set value.

[0039] The cutter system of the present invention improves the existing straight up and down cutting of the knife body into a circular rotation cutting method. The purpose is to make the cutting action of the cutter cooperate with the horizontal conveying action of the gypsum board, so that the cutting point is located on the trajectory of the circular rotation of the cutter body 1, that is, the tangent point of the motion models of the two, so that the gypsum board is cut when the trajectory of the circular motion of the horizontally conveyed gypsum board and the blade of the cutter body are tangent. In this process, after the cutter body 1 completes the cutting, the cutter body 1 actively moves away from the cutting side of the gypsum board, thereby reducing the conveying obstacle of the gypsum board by the cutter during the cutting process.

[0040] The contactless length measurement method provided in the present invention makes the drive triggering of the cutter more accurate and rapid, reduces the decoding conversion process, and controls the cutting timing more accurately.

[0041] In the present invention, in order to cooperate with the horizontal conveying of the gypsum board and the cutting of the uninterrupted conveying, the track of the driving unit driving the blade of the cutter body 1 to rotate in a circle includes:

[0042] The blade of the cutter body 1 starts to contact the surface of the gypsum board until the first rotation trajectory 6 of the cutting action is completed;

[0043] The blade of the cutter body 1 completes the cutting action to the second rotation track 7 where the driving unit drives the blade of the cutter body 1 to contact the surface of the gypsum board next time.

[0044] Among them, the light source projector 4 starts to project onto the surface of the cut gypsum board at the end of the first rotation trajectory 6, and the time when the driving unit drives the blade of the cutter body 1 to perform the second rotation trajectory 7 is the same as the time when the angle between the light source path projected by the light source projector 4 and the vertical direction reaches the set value.

[0045] The time that the driving unit drives the blade of the cutter body 1 to perform the second rotation trajectory 7 is less than the time that the angle between the light source path projected by the light source projector 4 and the vertical direction reaches the set value, and when the driving unit drives the blade of the cutter body 1 to reach the starting end of the first rotation trajectory 6, the driving unit stops.

[0046] Nowadays, we mostly use encoders to connect measuring wheels to determine the length that the cutter should cut in the two-control cutting of gypsum boards. This method mainly has the following problems:

[0047] 1. The specifications of gypsum boards are different, and the paper used is different, resulting in different smoothness. The friction between the measuring wheel and the paper surface is different, causing the encoder to slip in some cases, resulting in inaccurate length measurement.

[0048] 2. Long-term use of the measuring wheel will cause serious wear and tear. This will cause slipping, so you need to manually apply pressure to the measuring wheel to increase the pressure between it and the paper surface. However, this will cause an indentation on the board surface, affecting the quality of the board.

[0049] Therefore, it is necessary to design a non-contact length measurement method for the gypsum board to perform the length measurement of the tangent point control of the gypsum board.

[0050] To this end, the conveying following component 3 in the present invention includes a servo motor 31 and an angle wheel 32; wherein the light source projector 4 is arranged on the radius of the angle wheel 32 along the radial direction of the angle wheel 32, and the servo motor 31 drives the angle wheel 32 to rotate following the rate of gypsum board conveying.

[0051] Then, in order to solve the above-mentioned problem that the angle wheel 2 needs to rotate to a set angle (that is, converted into the gypsum board moving to a set length) and then return to the initial position, although this can be done in the gap between the cutter stroke and the cutting action, the rotation error of the angle wheel 2 will increase during the reciprocating reset process. For this reason, the present invention adopts a method in which the angle wheel 2 rotates in one direction all the time.

[0052] That is, a plurality of light source projectors 4 are evenly distributed on the radius of the angle wheel 32, and a receiver 5 is arranged on the side of each light source projector 4. After the servo motor 31 drives the angle wheel 32 to reach the set rotation angle, a trigger working signal of the light source projector 4 of the next group of vertical gypsum boards is generated; wherein, the servo motor 31 drives the angle wheel 32 to rotate unidirectionally.

[0053] The light source projector 4 generates at least two groups of infrared lights along the radial direction of the angle wheel 32, wherein one group of infrared lights is located outside the boundary of the cut-off point of the gypsum board, and the other group of infrared lights is located inside the boundary of the cut-off point of the gypsum board.

[0054] The light source projector 4 includes a first infrared light unit 12, a second infrared light unit 11 and a third infrared light unit 10. The infrared light projected by the first infrared light unit 12 is located outside the boundary of the cut portion of the gypsum board, the infrared light projected by the second infrared light unit is located within the boundary of the cut portion of the gypsum board, and the infrared light projected by the third infrared light unit is located outside the side edge of the gypsum board; wherein a signal receiver for receiving the infrared light projected by the third infrared light unit is provided on the conveying channel of the gypsum board.

[0055] The conveying passage of the gypsum board is provided with a signal receiver for receiving the infrared light projected by the third infrared light unit 10. The purpose is to determine the cutting stroke of the cutter from the start to the contact with the gypsum board through the signal receiver projected on the side of the gypsum board, that is, when the infrared light projected by the third infrared light unit 10 is received by the infrared light signal receiver 9 arranged on the conveying passage of the gypsum board, a control signal is generated to trigger the driving unit to drive the cutter body to start working.

[0056] The distance of the infrared light signal receiver arranged on the gypsum board conveying channel can be set according to the distance between the bottom of the cutter and the surface of the gypsum board. This method can effectively eliminate the inertial distance difference of the existing gypsum board length measurement triggering the cutter start process.

[0057] It is additionally explained that the power supply connection mode of the multiple light source projectors 4 is to electrically connect them by means of an electric slip ring.

[0058] In the present invention, of course, measurement can also be completed by a beam of infrared light. Of course, this is a representation of the infrared image reflected back by projecting the infrared light itself onto the object, that is, the infrared light is always irradiated on the cut edge of the gypsum board, and the camera module (replacing the infrared light receiving device), specifically the fisheye binocular module, is used to visually recognize the characteristics and distribution of the special light spot projected by the infrared emitting device on the edge of the gypsum board to judge the boundary characteristics of the gypsum board. The infrared emitting device forms a special light spot on the obstacle by emitting waves with a wavelength of 780-980nm.

[0059] To further illustrate, the light source projector 4 in the present invention may also be a laser.

[0060] The cutter body 1 includes an upper rotary cutter located above the gypsum board conveying plane and a lower rotary cutter located below the gypsum board conveying plane. The upper rotary cutter 11 and the lower rotary cutter both include a roller 101 and a cutter body 102 installed on the roller rod along the length direction of the roller 101.

[0061] Furthermore, in the technical means for cutting the gypsum board by rotating the knife body mentioned above, whether it is the existing two-control cutting method of the knife body straight up and down, or the rotary cutting method provided in the present invention, it should be clarified that when the blade of the knife body 102 begins to contact the surface of the gypsum board, the knife body 102 applies a force on the surface of the gypsum board that is at an obtuse angle to the conveying direction of the gypsum board. That is to say, when the knife body 102 starts to perform the first rotation trajectory 6, the force direction of the knife body 102 on the surface of the gypsum board is at a small angle to the gypsum board, which easily produces a cutting effect on the surface of the gypsum board, causing the surface of the gypsum board to be damaged.

[0062] The blade of the blade body 102 performs a first rotation trajectory 6 ( Figure 3 In the initial stage of the knife body 102 (rotating in a clockwise direction), the ideal state is that a cut mark is produced on the surface of the gypsum board. When the angle between the knife body 102 and the gypsum board approaches 90° (ideally, it is within the range of about 60° to 90°, of course, it is affected by the thickness and hardness of the gypsum board, the length of the knife body and the angular velocity), the force applied by the knife body 102 to the gypsum board is superimposed on the horizontal conveying state of the gypsum board. The main force component of the knife body 102 is vertical to the gypsum board, thereby completing the cutting of the gypsum board, thereby ensuring a smooth cutting process and a vertically smooth cut surface.

[0063] To this end, both ends of the roller 101 are provided with a yielding shock absorbing device 8, which is used to make the roller 101 as a whole move upward first and then downward when the driving unit drives the blade of the knife body 102 to perform the first rotation trajectory 6. That is, at the beginning of the knife body 102 performing the first rotation trajectory 6, the yielding shock absorbing device 8 makes the knife body 102 move upward as a whole but the knife body 102 does not leave the surface of the gypsum board 2, so that the force of the knife body 102 acting on the surface of the gypsum board 2 is reduced. When the knife body 102 rotates to a suitable position, the yielding shock absorbing device 8 allows the knife body 102 to rotate while superimposing a downward displacement (which needs to be adjusted according to the specific gypsum board thickness), thereby realizing the force and speed of the knife body 102 in the cutting process of the gypsum board 2. That is to say, this part includes the advantage of the straight up and down cutter.

[0064] To further illustrate the above technical purpose, the present invention provides a specific embodiment of a retreat and shock absorbing device 8, comprising a ring bracket 81 installed at both ends of a cutter body 1, a first guide shaft 82 vertically passing through the upper part of the ring bracket 81, and a second guide shaft 83 vertically passing through the lower part of the ring bracket 81, the first guide shaft 82 and the second guide shaft 83 are movably mounted together, and the portion where the first guide shaft is connected to the second guide shaft 83 is mounted with a spring 84, and roller bearings 85 are arranged on the shaft bodies of the first guide shaft 82 and the second guide shaft 83, and the end of the roller shaft of the upper rotating cutter is mounted on the first guide shaft 82 through the roller bearing 85, and the end of the roller shaft of the lower rotating cutter is mounted on the second guide shaft 83 through the roller bearing 85; a servo 1 86 connected to the first guide bearing 82 is arranged at the top of the ring bracket 81, and a servo 2 87 connected to the second guide bearing 83 is arranged at the bottom of the ring bracket 81.

[0065] Then, in order to solve the above-mentioned problem, the present invention hopes that at the moment when the blade of the knife body 102 contacts the gypsum board, the force exerted by the gypsum board on the knife body 102 is greater than the force exerted by the knife body 102 on the gypsum board (the effect of horizontal transportation of the gypsum board), which requires that the knife body 102 does not continue to apply pressure after a cut is made on the surface of the gypsum board (the blade of the knife body 102 is in the initial stage of the first rotation trajectory 6), and when the blade of the knife body 102 rotates to a suitable position (ideally within the range of 60° to 90°), the knife body 102 exerts a force on the gypsum board that can cut it.

[0066] When the driving unit receives a control signal to drive the blade 102 to rotate and contact the surface of the gypsum board 2, the servo 1 86 and the servo 2 87 cooperate with the circular rotation of the driving roller 101 of the driving unit and the horizontal conveying action of the gypsum board 2 to drive the first guide shaft 82 and the second guide shaft 83 to move away from each other, and vice versa, drive the first guide shaft 82 and the second guide shaft 83 to move towards each other, thereby adjusting the overall position of the upper rotating blade body and the lower rotating blade body.

[0067] It is further explained that the driving part in the present invention is specifically a servo motor, and the part of the servo motor that receives the control signal and drives the roller shaft 101 to rotate can be easily implemented in the prior art, and will not be described in detail in the present invention.

[0068] The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present application within the essence and protection scope of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present application.

Claims

1. A non-contact length measuring gypsum board cutting system, characterized in that: include: A cutter body (1) and a driving part driving the cutter body (1) to rotate in a circular motion, and the cutting of the gypsum board is completed when the trajectory of the circular motion of the horizontally transported gypsum board and the blade of the cutter body (1) are tangent; The cutter body (1) is provided with a conveying follower component (3) and a light source projector (4) and a receiver (5) mounted on the conveying follower component (3) at the end portion in the width direction; the conveying follower component (3) is used to convert the horizontal movement state of the gypsum board conveyance into its own circular rotation state, and the light source projector (4) is driven by the conveying follower component (3) so that the light source generated by the light source projector (4) is transmitted to the surface of the gypsum board cut; The receiver (5) is used to provide a trigger signal for the drive unit to drive the blade of the cutter body (1) to contact the surface of the gypsum board when the angle between the light source path projected by the light source projector (4) and the vertical direction reaches a set value; The trajectory of the driving unit driving the blade of the cutter body (1) to rotate in a circular motion comprises: A first rotation trajectory (6) in which the blade of the cutter body (1) starts to contact the surface of the gypsum board until the cutting action is completed; A second rotation track (7) from the blade of the cutter body (1) completing the cutting action to the drive unit driving the blade of the cutter body (1) to contact the surface of the gypsum board next time; The light source projector (4) starts to project light onto the surface of the cut portion of the gypsum board at the end of the first rotation trajectory (6), and the time for the driving unit to drive the blade of the cutter body (1) to perform the second rotation trajectory (7) is the same as the time for the angle between the light source path projected by the light source projector (4) and the vertical direction to reach a set value; The time for the driving unit to drive the blade of the cutter body (1) to perform the second rotation trajectory (7) is less than the time for the angle between the light source path projected by the light source projector (4) and the vertical direction to reach a set value, and when the driving unit drives the blade of the cutter body (1) to reach the starting end of the first rotation trajectory (6), the driving unit stops; The conveying follower component (3) comprises a servo motor (31) and an angle wheel (32); wherein the light source projector (4) is arranged on the radius of the angle wheel (32) along the radial direction of the angle wheel (32), and the servo motor (31) drives the angle wheel (32) to rotate following the speed of the gypsum board conveying; A plurality of light source projectors (4) are evenly distributed on the radius of the angle wheel (32), and the receiver (5) is arranged on the side of each of the light source projectors (4). After the servo motor (31) drives the angle wheel (32) to reach a set rotation angle, a triggering working signal for the light source projectors (4) of the next group of vertical gypsum boards is generated; wherein the servo motor (31) drives the angle wheel (32) to rotate in one direction; The light source projector (4) generates at least two groups of infrared lights along the radial direction of the angle wheel (32), wherein one group of infrared lights is located outside the boundary of the cut-off point of the gypsum board, and the other group of infrared lights is located inside the boundary of the cut-off point of the gypsum board; The light source projector (4) comprises a first infrared light unit, a second infrared light unit and a third infrared light unit, wherein the infrared light projected by the first infrared light unit is located outside the boundary of the cut portion of the gypsum board, the infrared light projected by the second infrared light unit is located inside the boundary of the cut portion of the gypsum board, and the infrared light projected by the third infrared light unit is located outside the side edge of the gypsum board; wherein a signal receiver for receiving the infrared light projected by the third infrared light unit is provided on the conveying channel of the gypsum board.

2. A non-contact length measuring gypsum board cutting system according to claim 1, characterized in that: The cutter body (1) comprises an upper rotary cutter located above the gypsum board conveying plane and a lower rotary cutter located below the gypsum board conveying plane, and the upper rotary cutter (11) and the lower rotary cutter both comprise a roller (101) and a cutter body (102) mounted on the roller (101) along the length direction of the roller (101); Both ends of the roller shaft (101) are provided with a retreat damping device (8), and the retreat damping device (8) is used to cause the roller shaft (101) as a whole to first move upward and then move downward when the driving unit drives the blade of the knife body (102) to move in a first rotation trajectory (6).

3. The non-contact length measuring gypsum board cutting system according to claim 2, characterized in that: The yielding shock absorbing device (8) comprises a ring bracket (81) mounted at both ends of the cutter body (1), a first guide shaft (82) vertically passing through the upper part of the ring bracket (81), and a second guide shaft (83) vertically passing through the lower part of the ring bracket (81); the first guide shaft (82) and the second guide shaft (83) are movably sleeved together, and a spring (84) is sleeved on a portion where the first guide shaft is connected to the second guide shaft (83); roller bearings (85) are arranged on the shaft bodies of the first guide shaft (82) and the second guide shaft (83); an end of the roller shaft of the upper rotating cutter is mounted on the first guide shaft (82) through the roller bearing (85), and an end of the roller shaft of the lower rotating cutter is mounted on the second guide shaft (83) through the roller bearing (85); a first servo (86) connected to the first guide shaft (82) is arranged at the top of the ring bracket (81), and a second servo (87) connected to the second guide shaft (83) is arranged at the bottom of the ring bracket (81).

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