Wire harness cutting device

Abstract

The invention relates to the technical field of wire harness processing, and discloses a wire harness cut-off device which comprises a base, two vertical mounting plates are symmetrically and fixedly connected to the outer wall of the top of the base, the two vertical mounting plates are rotatably connected with the same cut-off cylinder, and an annular protruding part is arranged in the middle of the cut-off cylinder; the base is provided with a rotating mechanism used for enabling the cutting-off cylinder to rotate, three first driving shafts are rotationally connected to the interior of the annular protruding part at equal intervals, a short cutting-off knife, a middle cutting-off knife and a long cutting-off knife are fixedly connected to the outer walls of the three first driving shafts correspondingly, and the cutting length of the short cutting-off knife is smaller than that of the middle cutting-off knife. Through cooperative operation of the three cutting knives with progressive lengths and swinging speeds, layered annular cutting of the wire harness from outside to inside is achieved, traditional huge shearing force is decomposed into multiple times of cutting, tool abrasion, impact vibration and noise are effectively reduced, the notch quality is improved, and the service life of equipment is prolonged.

Description

Technical Field

[0001] This invention relates to the field of wire harness processing technology, and in particular to a wire harness cutting device. Background Technology

[0002] A wire harness is a wiring component in a circuit that connects various electrical devices. It consists of an insulating sheath, terminals, wires, and insulating wrapping material. Chinese Patent Publication No. CN115041611A discloses a wire harness cutting device, relating to the technical field of cutting devices. The device includes a support frame, on which a conveying assembly is mounted. The conveying assembly drives the wire harness to move. A synchronous slide is mounted on the support frame and slidably on it. The synchronous slide can be connected to the conveying assembly. A cutting assembly is mounted on the synchronous slide for cutting the wire harness. A driving component is mounted on the support frame. After the synchronous slide is connected to the conveying assembly, the synchronous slide moves with the conveying assembly. The cutting assembly cuts the wire harness. After the wire harness is cut, the cutting assembly resets, the synchronous slide separates from the conveying assembly, and the driving component pushes the synchronous slide to the initial position, realizing online cutting of the wire harness and improving the cutting efficiency. At the same time, the cutting surface of the wire harness is perpendicular to the axis of the wire harness, ensuring the cutting quality of the wire harness. However, existing wire harness cutting methods all cut all the core wires of the wire harness at the same time by generating huge instantaneous force. This cutting method can easily cause deformation and flattening of the wire harness end face, thus affecting the quality of the wire harness.

[0003] In view of this, the present invention proposes a wire harness cutting device to solve the problems existing in the prior art. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a wire harness cutting device.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A wire harness cutting device includes a base. Two vertical mounting plates are symmetrically fixedly connected to the top outer wall of the base. A cutting cylinder is rotatably connected to the two vertical mounting plates, and an annular protrusion is provided in the middle of the cutting cylinder. A rotating mechanism for rotating the cutting cylinder is provided on the base. Three drive shafts are rotatably connected at equal intervals inside the annular protrusion. A short cutting blade, a medium cutting blade, and a long cutting blade are respectively fixedly connected to the outer wall of the three drive shafts. The cutting length of the short cutting blade is less than that of the medium cutting blade. The cutting length is such that the length cut by the medium cutting blade is less than the length cut by the long cutting blade, and the length cut by the long cutting blade is greater than the radius of the cut wire harness. The cutting cylinder is equipped with a driving mechanism, and each end of the driving shaft is equipped with a transmission mechanism. The driving mechanism and the transmission mechanism cooperate to control each driving shaft to drive the short cutting blade, the medium cutting blade and the long cutting blade to swing simultaneously, and make the swing speed of the short cutting blade greater than the swing speed of the medium cutting blade, and the swing speed of the medium cutting blade greater than the swing speed of the long cutting blade.

[0006] Furthermore, the rotating mechanism includes a first transmission wheel, a transmission belt, a second transmission wheel, and a servo motor. The servo motor is fixedly connected to the outer wall of the base by bolts. The second transmission wheel is fixedly connected to the output shaft end of the servo motor. The first transmission wheel is fixedly connected to the outer wall of the cutting cylinder. The transmission belt is sleeved on the outer walls of the first and second transmission wheels.

[0007] Furthermore, the driving mechanism includes an internal gear and three fixed plates. The internal gear is fixedly connected to the outer wall of one of the vertical mounting plates, and the three fixed plates are fixedly connected at equal distances to the outer wall of the cutting cylinder. Each fixed plate is rotatably connected to a drive shaft.

[0008] Furthermore, each of the three drive shafts has a drive gear fixedly connected to one end, which meshes with the internal gear, and the other ends of the three drive shafts are respectively fixedly connected to drive bevel gear one, drive bevel gear two, and drive bevel gear three. The number of teeth of drive bevel gear one is greater than the number of teeth of drive bevel gear two, and the number of teeth of drive bevel gear two is greater than the number of teeth of drive bevel gear three.

[0009] Furthermore, the transmission mechanism includes two support plates, which are fixedly connected to the outer wall of the cut-off cylinder, and a worm gear is rotatably connected between the two support plates. A worm wheel meshes below the worm gear, and the worm wheel is fixedly connected to a corresponding drive shaft. A driven bevel gear is fixedly connected to the outer wall of the worm gear.

[0010] Furthermore, the first driving bevel gear meshes with the driven bevel gear in the drive shaft-end transmission mechanism with the short cut-off blade fixed, the second driving bevel gear meshes with the driven bevel gear in the drive shaft-end transmission mechanism with the medium cut-off blade fixed, and the third driving bevel gear meshes with the driven bevel gear in the drive shaft-end transmission mechanism with the long cut-off blade fixed.

[0011] Furthermore, three fixing plates are fixedly connected at equal intervals inside the annular protrusion, and each fixing plate is slidably connected to a guide rod. An arc-shaped drive plate is fixedly connected to the end of each guide rod away from the axis of the cut-off cylinder, and a cam is provided on the outside of each arc-shaped drive plate. The cams are respectively fixedly connected to the corresponding drive shafts.

[0012] Furthermore, a return spring is provided between the arc-shaped drive plate and the fixed plate, and the return spring is sleeved on the outer wall of the guide rod. An arc-shaped pressing plate is fixedly connected to the other end of the guide rod, and multiple pressing balls are equally spaced on the outer wall of the arc-shaped pressing plate facing the axis of the cut-off cylinder.

[0013] The beneficial effects of this invention are as follows: By using three cutting blades with progressively increasing lengths and oscillation speeds, the wire harness is cut in layers from the outside in, breaking down the traditionally huge shearing force into multiple cuts. This effectively reduces tool wear, impact vibration, and noise, while improving cut quality and equipment lifespan. Attached Figure Description

[0014] Figure 1 A schematic diagram of a wire harness cutting device; Figure 2 An exploded schematic diagram of a wire harness cutting device; Figure 3 A schematic diagram of the cutting cylinder structure of a wire harness cutting device; Figure 4 A schematic cross-sectional view of the cutting cylinder of a wire harness cutting device; Figure 5 A schematic diagram of the outer wall structure of a fixing plate for a wire harness cutting device; Figure 6 A schematic diagram of the transmission mechanism of a wire harness cutting device; Figure 7 This is a schematic diagram of the drive mechanism of a wire harness cutting device.

[0015] In the diagram: 1. Base; 2. Vertical mounting plate; 3. Cutting cylinder; 4. Internal gear; 5. Transmission wheel one; 6. Transmission belt; 7. Transmission wheel two; 8. Servo motor; 9. Annular protrusion; 10. Support plate; 11. Short cutting blade; 12. Medium cutting blade; 13. Fixing plate one; 14. Drive shaft one; 15. Long cutting blade; 16. Pressing ball; 17. Return spring; 18. Cam; 19. Arc-shaped drive plate; 20. Guide rod; 21. Arc-shaped pressing plate; 22. Worm gear; 23. Worm; 24. Driven bevel gear; 25. Drive bevel gear one; 26. Drive bevel gear two; 27. Fixing plate two; 28. Drive shaft two; 29. ​​Drive bevel gear three; 30. Drive gear. Detailed Implementation

[0016] The technical solution of the present invention will be further described in detail below with reference to specific embodiments.

[0017] Reference Figure 1 , Figure 2 , Figure 4A wire harness cutting device includes a base 1. Two vertical mounting plates 2 are symmetrically fixedly connected to the top outer wall of the base 1. A cutting cylinder 3 is rotatably connected to the two vertical mounting plates 2, and an annular protrusion 9 is provided in the middle of the cutting cylinder 3. A rotating mechanism for rotating the cutting cylinder 3 is provided on the base 1. Three drive shafts 14 are rotatably connected at equal intervals inside the annular protrusion 9. A short cutting blade 11, a medium cutting blade 12, and a long cutting blade 15 are respectively fixedly connected to the outer wall of the three drive shafts 14. The cutting length of the short cutting blade 11 is less than the cutting length of the medium cutting blade 12, and the cutting length of the medium cutting blade 12 is less than the cutting length of the long cutting blade 15. The cutting length of the long cutting blade 15 is greater than the radius of the wire harness being cut. A drive mechanism is provided, and a transmission mechanism is provided at one end of each drive shaft 14. The drive mechanism and the transmission mechanism cooperate to control each drive shaft 14 to drive the short cutter 11, the medium cutter 12, and the long cutter 15 to swing simultaneously, and make the swing speed of the short cutter 11 greater than that of the medium cutter 12, and the swing speed of the medium cutter 12 greater than that of the long cutter 15. The wire harness to be cut is coaxially passed through the cutting cylinder 3. Then, the rotation mechanism is activated to make the cutting cylinder 3 rotate. When the cutting cylinder 3 rotates, the drive mechanism and the transmission mechanism on the outside of the cutting cylinder 3 cooperate to make the three drive shafts 14 in the annular protrusion 9 of the cutting cylinder 3 rotate, so that each drive shaft 14 can simultaneously drive the short cutter 11, the medium cutter 12, and the long cutter 15. The long cutting blade 15 swings towards the wire harness, while the short cutting blade 11, medium cutting blade 12, and long cutting blade 15 rotate together with the rotary cutting cylinder 3. This allows the short cutting blade 11, medium cutting blade 12, and long cutting blade 15 to perform a circumferential cut on the wire harness. Furthermore, with the cooperation of the drive mechanism and the transmission mechanism, the swing speed of the short cutting blade 11 is greater than that of the medium cutting blade 12, and the swing speed of the medium cutting blade 12 is greater than that of the long cutting blade 15. Since the cutting length of the short cutting blade 11 is less than that of the medium cutting blade 12, and the cutting length of the medium cutting blade 12 is less than that of the long cutting blade 15, the short cutting blade 11 contacts the wire harness first, beginning to cut the outermost insulation layer and part of the shielding layer. Subsequently, the middle cutting blade 12 cuts in, processing part of the shielding layer and filler; finally, the long cutting blade 15 processes the core conductor. The entire process decomposes the "one-time huge shearing force" into "multiple smaller cutting forces." The short cutting blade 11, the middle cutting blade 12, and the long cutting blade 15 undertake different cutting tasks. This division of labor avoids a single blade bearing all the wear, and the differential oscillation and layered cutting avoid huge impact forces, making the cutting process smoother, with less noise and vibration. After the cutting is completed, the rotating mechanism reverses the cutting cylinder 3. Through the cooperation of the drive mechanism and the transmission mechanism, the short cutting blade 11, the middle cutting blade 12, and the long cutting blade 15 in the annular protrusion 9 can be reset to complete the next cutting operation.

[0018] Reference Figure 2 As a further embodiment of the present invention, the rotating mechanism includes a first transmission wheel 5, a transmission belt 6, a second transmission wheel 7, and a servo motor 8. The servo motor 8 is fixedly connected to the outer wall of the base 1 by bolts. The second transmission wheel 7 is fixedly connected to the output shaft end of the servo motor 8. The first transmission wheel 5 is fixedly connected to the outer wall of the cutting cylinder 3. The transmission belt 6 is sleeved on the outer walls of the first transmission wheel 5 and the second transmission wheel 7. The servo motor 8, through the cooperation of the first transmission wheel 5, the transmission belt 6, and the second transmission wheel 7, can make the cutting cylinder 3 rotate forward or backward.

[0019] Reference Figure 7 As a further embodiment of the present invention, the driving mechanism includes an internal gear 4 and three fixing plates 27. The internal gear 4 is fixedly connected to the outer wall of one of the vertical mounting plates 2, and the three fixing plates 27 are fixedly connected at equal distances to the outer wall of the cutting cylinder 3. Each fixing plate 27 is rotatably connected to a driving shaft 28.

[0020] Reference Figure 7 As a further embodiment of the present invention, each of the three drive shafts 28 has a drive gear 30 fixedly connected to one end, which meshes with the internal gear 4. The other ends of the three drive shafts 28 are respectively fixedly connected to drive bevel gear 1 25, drive bevel gear 26, and drive bevel gear 3 29. The number of teeth of drive bevel gear 1 25 is greater than the number of teeth of drive bevel gear 26, and the number of teeth of drive bevel gear 26 is greater than the number of teeth of drive bevel gear 3 29. When the cutting cylinder 3 rotates, since the internal gear 4 is fixedly connected to one of the vertical mounting plates 2, and the drive gears 30 on each drive shaft 28 mesh with the internal gear 4, when the internal gear 4 rotates, the drive bevel gear 1 25, drive bevel gear 26, and drive bevel gear 3 29 can rotate synchronously through the drive shafts 28, and the rotation speed is the same.

[0021] Reference Figure 3 and Figure 6 As a further embodiment of the present invention, the transmission mechanism includes two support plates 10, which are fixedly connected to the outer wall of the cutting cylinder 3. A worm gear 23 is rotatably connected between the two support plates 10. A worm wheel 22 meshes below the worm gear 23 and is fixedly connected to the corresponding drive shaft 14. A driven bevel gear 24 is fixedly connected to the outer wall of the worm gear 23. Through the self-locking property of the worm wheel 22 and the worm gear 23, the resistance of the wire harness and the inertia of the cutting tool itself are prevented from causing the short cutting blade 11, the medium cutting blade 12 and the long cutting blade 15 to swing in opposite directions or bounce back. At the same time, the vibration and shaking of the short cutting blade 11, the medium cutting blade 12 and the long cutting blade 15 when cutting hard points or uneven materials are avoided, making the cutting process more stable and the cut smoother.

[0022] Reference Figure 2 , Figure 3 and Figure 7As a further embodiment of the present invention, drive bevel gear 25 meshes with driven bevel gear 24 in the transmission mechanism at one end of drive shaft 14, which is fixed with short cutting blade 11; drive bevel gear 26 meshes with driven bevel gear 24 in the transmission mechanism at one end of drive shaft 14, which is fixed with medium cutting blade 12; and drive bevel gear 29 meshes with driven bevel gear 24 in the transmission mechanism at one end of drive shaft 14, which is fixed with long cutting blade 15. Because the number of teeth of drive bevel gear 25 is greater than the number of teeth of drive bevel gear 26... The number of teeth of the second drive bevel gear 26 is greater than the number of teeth of the third drive bevel gear 29, which enables the rotational speed of the drive shaft 14 with the short cut-off blade 11 fixed to be greater than the rotational speed of the drive shaft 14 with the middle cut-off blade 12 fixed to be greater than the rotational speed of the drive shaft 14 with the middle cut-off blade 12 fixed to be greater than the rotational speed of the drive shaft 14 with the long cut-off blade 15 fixed to be greater than the rotational speed of the short cut-off blade 11, and the rotational speed of the middle cut-off blade 12 is greater than the rotational speed of the long cut-off blade 15.

[0023] Working principle: The wire harness to be cut is coaxially passed through the cutting cylinder 3. Then, the rotating mechanism is activated to rotate the cutting cylinder 3. When the cutting cylinder 3 rotates, the drive mechanism and transmission mechanism outside the cutting cylinder 3 cooperate to rotate the three drive shafts 14 in the annular protrusion 9 of the cutting cylinder 3. Thus, each drive shaft 14 can simultaneously drive the short cutting blade 11, the medium cutting blade 12, and the long cutting blade 15 to swing towards the wire harness. At the same time, the short cutting blade 11, the medium cutting blade 12, and the long cutting blade 15 can rotate together with the cutting cylinder 3, so that the short cutting blade 11, the medium cutting blade 12, and the long cutting blade 15 can complete the circumferential cutting of the wire harness. Furthermore, with the cooperation of the drive mechanism and the transmission mechanism, the swing speed of the short cutting blade 11 is greater than that of the medium cutting blade 12, and the swing speed of the medium cutting blade 12 is greater than that of the long cutting blade 15. Moreover, because the cutting length of the short cutting blade 11 is less than that of the medium cutting blade 12, the cutting length of the long cutting blade 15 is also greater. The length of the short cutting blade 11 is shorter than that of the long cutting blade 15, allowing the short cutting blade 11 to contact the wire harness first and begin cutting the outermost insulation layer and part of the shielding layer. Then, the medium cutting blade 12 cuts in, processing part of the shielding layer and filler. Finally, the long cutting blade 15 processes the core conductor. This process decomposes the "one-time huge shearing force" into "multiple smaller cutting forces." By having the short cutting blade 11, medium cutting blade 12, and long cutting blade 15 undertake different cutting tasks, this division of labor avoids a single blade bearing all the wear. Furthermore, differential oscillation and layered cutting avoid huge impact forces, making the cutting process smoother with less noise and vibration. After cutting is complete, the rotating mechanism reverses the cutting cylinder 3. Through the cooperation of the drive mechanism and transmission mechanism, the short cutting blade 11, medium cutting blade 12, and long cutting blade 15 in the annular protrusion 9 can be reset to complete the next cutting operation.

[0024] Reference Figure 4 and Figure 5 As a further embodiment of the present invention, three fixed plates 13 are fixedly connected at equal intervals inside the annular protrusion 9, and each fixed plate 13 is slidably connected to a guide rod 20. An arc-shaped drive plate 19 is fixedly connected to the end of the guide rod 20 away from the axis of the cutting cylinder 3, and a cam 18 is provided on the outside of each arc-shaped drive plate 19. The cam 18 is fixedly connected to the corresponding drive shaft 14. When each drive shaft 14 rotates, it will drive the cam 18 on its outer wall to rotate synchronously. During the rotation, the cam 18 will contact the arc-shaped drive plate 19 on the guide rod 20 and apply force to it.

[0025] Reference Figure 5 As a further embodiment of the present invention, a return spring 17 is provided between the arc-shaped drive plate 19 and the fixed plate 13, and the return spring 17 is sleeved on the outer wall of the guide rod 20. An arc-shaped pressing plate 21 is fixedly connected to the other end of the guide rod 20, and multiple pressing balls 16 are evenly arranged on the outer wall of the arc-shaped pressing plate 21 facing the axis of the cutting cylinder 3. This causes the arc-shaped drive plate 19 to press the return spring 17 closer to the fixed plate 13, thereby causing the arc-shaped pressing plate 21 on the other end of the guide rod 20 to bring the multiple pressing balls 16 closer to and contact the outer wall of the wire harness. When the short cutting blade... 11. When the medium cutting blade 12 and the long cutting blade 15 perform circumferential cutting on the wire harness, the arc-shaped pressing plate 21, in conjunction with multiple pressing balls 16, can apply force from the opposite side of the cutting position. This force cancels out the positive force of the short cutting blade 11, the medium cutting blade 12, and the long cutting blade 15, ensuring that the wire harness maintains its original circular cross-section at the cutting point. This prevents the core wire from being damaged during the cutting process, thus protecting the electrical characteristics of the wire harness. At the same time, it can form a clamping force, effectively counteracting the cutting thrust and firmly fixing the wire harness at the predetermined cutting position, ensuring the accuracy and consistency of the cutting.

[0026] Working principle: When each drive shaft 14 rotates, it will cause the cam 18 on its outer wall to rotate synchronously. During the rotation, the cam 18 will contact the arc-shaped drive plate 19 on the guide rod 20 and apply force to it, causing the arc-shaped drive plate 19 to press the return spring 17 closer to the fixed plate 13. This will cause the arc-shaped pressing plate 21 on the other end of the guide rod 20 to bring multiple pressing balls 16 closer to and contact the outer wall of the wire harness. When the short cutting blade 11, the medium cutting blade 12, and the long cutting blade 15 circumferentially cut the wire harness, By using the arc-shaped pressing plate 21 in conjunction with multiple pressing balls 16, force can be applied from the opposite side of the cutting position, which cancels out the positive force of the short cutting blade 11, the medium cutting blade 12 and the long cutting blade 15. This ensures that the wire harness maintains its original circular cross-section at the cutting point, preventing the core wire from being damaged during the cutting process and protecting the electrical characteristics of the wire harness. At the same time, it can form a clamping force, effectively counteracting the cutting thrust and firmly fixing the wire harness at the predetermined cutting position, ensuring the accuracy and consistency of the cutting.

[0027] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A wire harness cutting device, comprising a base (1), the top outer wall of which is symmetrically fixedly connected with two vertical mounting plates (2), characterized in that, One of two vertical installation plates (2) is provided with a same cutting-off cylinder (3), and the middle of the cutting-off cylinder (3) is provided with an annular protruding part (9); the base (1) is provided with a rotating mechanism for rotating the cutting-off cylinder (3); the inside of the annular protruding part (9) is rotatably connected with three driving shafts (14) at equal distances; the outer walls of the three driving shafts (14) are respectively fixedly connected with a short cutting-off knife (11), a middle cutting-off knife (12) and a long cutting-off knife (15); the cutting length of the short cutting-off knife (11) is less than that of the middle cutting-off knife (12), and the cutting length of the middle cutting-off knife (12) is less than that of the long cutting-off knife (15); the cutting length of the long cutting-off knife (15) is greater than the radius of the wire harness to be cut off; the cutting-off cylinder (3) is provided with a driving mechanism; one end of each of the driving shafts (14) is provided with a transmission mechanism; the driving mechanism and the transmission mechanism are matched to control each driving shaft (14) to drive the short cutting-off knife (11), the middle cutting-off knife (12) and the long cutting-off knife (15) to swing at the same time, and the swinging speed of the short cutting-off knife (11) is greater than that of the middle cutting-off knife (12), and the swinging speed of the middle cutting-off knife (12) is greater than that of the long cutting-off knife (15).

2. A wiring harness severing device according to claim 1, wherein The rotating mechanism comprises a transmission wheel one (5), a transmission belt (6), a transmission wheel two (7) and a servo motor (8); the servo motor (8) is fixedly connected to the outer wall of the base (1) through bolts; the transmission wheel two (7) is fixedly connected to the output shaft end of the servo motor (8); the transmission wheel one (5) is fixedly connected to the outer wall of the cutting-off cylinder (3); and the transmission belt (6) is sleeved on the outer walls of the transmission wheel one (5) and the transmission wheel two (7).

3. A wire harness cutting device according to claim 2, wherein The driving mechanism comprises an internal gear (4) and three fixed plates two (27); the internal gear (4) is fixedly connected to the outer wall of one of the vertical installation plates (2); the three fixed plates two (27) are fixedly connected to the outer wall of the cutting-off cylinder (3) at equal distances; and each of the fixed plates two (27) is rotatably connected with a driving shaft two (28).

4. A wiring harness severing device according to claim 3, wherein One end of each of the driving shafts two (28) is fixedly connected with a driving gear (30) engaged with the internal gear (4); the other end of each of the three driving shafts two (28) is respectively fixedly connected with a driving bevel gear one (25), a driving bevel gear two (26) and a driving bevel gear three (29); the number of teeth of the driving bevel gear one (25) is greater than that of the driving bevel gear two (26); and the number of teeth of the driving bevel gear two (26) is greater than that of the driving bevel gear three (29).

5. A wiring harness severing device according to claim 4, wherein The transmission mechanism comprises two support plates (10); the two support plates (10) are fixedly connected to the outer wall of the cutting-off cylinder (3); and a worm (23) is rotatably connected between the two support plates (10); the lower part of the worm (23) is engaged with a worm wheel (22); the worm wheel (22) is fixedly connected to the corresponding driving shaft one (14); and the outer wall of the worm (23) is fixedly connected with a driven bevel gear (24).

6. A wire harness cutting device according to claim 5, wherein The driving bevel gear one (25) is engaged with the driven bevel gear (24) in the one end transmission mechanism of the driving shaft one (14) fixed with the short cutting knife (11), the driving bevel gear two (26) is engaged with the driven bevel gear (24) in the one end transmission mechanism of the driving shaft one (14) fixed with the medium cutting knife (12), and the driving bevel gear three (29) is engaged with the driven bevel gear (24) in the one end transmission mechanism of the driving shaft one (14) fixed with the long cutting knife (15).

7. A wire harness cutting device according to claim 1, wherein Three fixed plates one (13) are fixedly connected at equal distances inside the annular convex part (9), slidingly connected with guide rods (20) on the fixed plates one (13), one ends of the guide rods (20) away from the axis of the cutting barrel (3) are fixedly connected with arc-shaped driving plates (19), the arc-shaped driving plates (19) are all provided with cams (18) outside, and the cams (18) are fixedly connected with corresponding driving shafts one (14).

8. A wire harness cutting device according to claim 7, wherein Reset springs (17) are all arranged between the arc-shaped driving plates (19) and the fixed plates one (13), the reset springs (17) are sleeved on the outer walls of the guide rods (20), the other ends of the guide rods (20) are fixedly connected with arc-shaped pressing plates (21), and a plurality of pressing balls (16) are arranged at equal distances on the outer walls of the arc-shaped pressing plates (21) towards the axis of the cutting barrel (3).

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