A kind of automatic cutting equipment for protective tube

Abstract

The present application provides an automatic cutting device for a protective tube, which belongs to the technical field of protective tube processing, and comprises a machine base, a fixing mechanism for fixing the protective tube and a cutting and chamfering mechanism for cutting the protective tube, and is characterized in that it also comprises: a pressing frame, which is provided with two, and the two pressing frames are longitudinally slidably connected to the machine base, and correspond to the inner wall and outer wall of the two protective tubes respectively, and air bags are arranged inside the pressing frames, and an air guide tube which can be connected with the two air bags is penetrated on the machine base, and a plurality of pressing rollers which can be pushed out by the air bags are longitudinally slidably connected inside the pressing frames, and are used for supporting the inner wall and outer wall of the protective tube during the chamfering process; the present application can reduce the probability of radial deformation of the tube wall at the chamfer of the protective tube, and improve the accuracy of subsequent docking work.

Description

Technical Field

[0001] The present application relates to the technical field of protective tube processing, and in particular to an automatic cutting device for protective tubes. Background Art

[0002] Cable protection tubes, also known as MPP tubes, should be laid on the outer layer of cables when in use to prevent short circuit accidents caused by cable breakage, thereby avoiding power outages or fire accidents. In the processing of MPP tubes, in order to produce MPP tubes longer than the standard length, it is often necessary to first cut a standard length MPP tube to a suitable length according to the production requirements, and then butt the cut MPP tube with another standard length MPP tube. Before butt jointing, it is necessary to perform inner and outer chamfering on the butt end faces of the two MPP tubes, respectively, so that the two MPP tubes can be butt jointed normally during the subsequent processing.

[0003] The current protective tube cutting equipment generally uses a clamping tool to fix the protective tube during operation, and then the cutting machine cuts and chamfers the fixed protective tube. Referring to the Chinese patent application document with publication number CN115592727A and publication date January 13, 2023, entitled "An automated high-precision cutting process for MPP protective tubes", an auxiliary support mechanism is provided to make the MPP protective tube more stable during the cutting process, preventing the MPP protective tube from shaking up and down during cutting and affecting the cutting effect.

[0004] Referring to the above technical solution, when the protective tube is cut and chamfered, as the chamfering knife continues to cut the protective tube, the tube wall at the chamfer of the protective tube will gradually become thinner. At this time, the tube wall at the chamfer of the protective tube is prone to radial deformation under the pressure exerted by the chamfering knife, which will cause inaccurate docking of the two protective tubes during subsequent docking. Summary of the invention

[0005] In view of this, the present application provides an automatic cutting device for a protective tube, which is mainly used to solve the problem that radial deformation of the tube wall at the chamfer of the protective tube affects the docking accuracy.

[0006] In order to solve the above-mentioned technical problems, the present application provides an automatic cutting device for a protective tube, comprising a machine base, a fixing mechanism for fixing the protective tube and a cutting and chamfering mechanism for cutting the protective tube, and is characterized in that it also includes: a pressure frame, which is provided with two, and the two pressure frames are longitudinally slidably connected to the machine base, and respectively correspond to the inner walls and outer walls of the two protective tubes, and air bags are provided inside the pressure frames, and an air guide tube that can be connected to the two air bags is penetrated on the machine base, and a plurality of pressure rollers that can be pushed out by the air bags are longitudinally slidably connected inside the pressure frames, which are used to support the inner and outer walls of the protective tube during the chamfering process.

[0007] By adopting the above technical solution, when the protective tube cutting work is carried out, the pressure roller can adaptively press against the chamfer of the protective tube through the cooperation of the airbag, and provide support for the chamfer of the protective tube to a certain extent to reduce its radial deformation, so that the two protective tubes can be accurately docked during the subsequent docking work.

[0008] Optionally, two rollers capable of providing bearing for the protective tube are rotatably connected to the machine base.

[0009] By adopting the above technical solution, during the processing of the protective tube, the rollers can provide load-bearing support for the protective tube, so that the cutting and chamfering work can be carried out stably.

[0010] Optionally, the fixing mechanism includes: two rotating rods, which are rotatably connected to the machine base, each rotating rod is radially slidably connected to a plurality of clamping blocks, each rotating rod is rotatably connected to a plurality of screws that can correspond one-to-one with the clamping blocks and drive the clamping blocks to radially displace, and each screw is provided with a driven bevel gear; a rotating shaft, which is rotatably connected between the two rotating rods and passes through the two rotating rods, and both ends of the rotating shaft are provided with active bevel gears that can mesh with the driven bevel gears, and a first motor that can drive the rotating shaft to rotate is provided on the machine base.

[0011] By adopting the above technical solution, multiple tightening blocks can move synchronously to tighten and fix the protective tube from the inside, so that the protective tube can receive a more uniform supporting force, which can reduce the deformation of the protective tube to a certain extent.

[0012] Optionally, a driving mechanism is provided on the machine base for driving the protective tube in a fixed state to rotate.

[0013] By adopting the above technical solution, the protective tube in a fixed state is rotated by utilizing the cooperation of the driving mechanism. Compared with the circular trajectory chamfering work in which the protective tube is in a stationary state and the chamfering equipment is in a moving state, the probability of deviation of the chamfering edge can be reduced within a certain range.

[0014] Optionally, the driving mechanism includes a second motor disposed on the machine base, and a pulley capable of transmitting power through a belt and two rotating rods is disposed on the output shaft of the second motor.

[0015] By adopting the above technical solution, when the second motor is running, the rotating rod can be rotated through the transmission of the pulley, and then the protection tube fixed on the rotating rod can be rotated to cooperate with the subsequent cutting and chamfering work.

[0016] Optionally, the cutting and chamfering mechanism includes a linear driver arranged on a machine base, an execution end of the linear driver is provided with a cylinder, an execution end of the cylinder is provided with a push block, and a cutting knife is provided on the push block.

[0017] By adopting the above technical solution, the cutting work of the protective tube can be completed by making the cutting knife contact with the protective tube in a rotating state through the cooperation of the linear drive and the cylinder.

[0018] Optionally, the cutting and chamfering mechanism also includes a synchronous gear rotatably connected to the machine base, and two chamfering knives are longitudinally slidably connected to the machine base and are rotationally symmetrical one hundred and eighty degrees with the synchronous gear as a reference. Both chamfering knives are provided with a rack plate that can mesh with the synchronous gear, so as to make the two chamfering knives approach each other or move away from each other. A receiving groove for inserting the cutting knife is provided on the chamfering knife close to the push block side, so that the push block can drive the chamfering knife to advance and move, and a reset spring that can cause the chamfering knife to retract is provided on the machine base.

[0019] By adopting the above technical solution, under the action of the synchronous gear and the rack plate, the two chamfering cutters can be fed synchronously to complete the chamfering work on the protective tube.

[0020] Optionally, the pressure frame is longitudinally slidably connected with a linkage plate that can be fixedly connected to the chamfering knife, and a limit spring is arranged between the pressure frame and the linkage plate to provide elastic displacement compensation for the pressure frame when the chamfering knife is displaced.

[0021] In summary, compared with the prior art, the present application includes at least one of the following beneficial technical effects:

[0022] 1. The chamfer of the protective tube is supported during the chamfering process by an adaptive tightening method, which reduces the probability of radial deformation of the tube wall at the chamfer of the protective tube due to the pressure exerted by the chamfering knife, and improves the docking accuracy of the two protective tubes during subsequent docking work.

[0023] 2. The protective tube is fixed by internal tightening. Compared with the external clamping method, the protective tube can be supported more evenly, reducing the probability of deformation of the protective tube due to uneven clamping force. It is also easy to center the protective tube, which is convenient for subsequent processing.

[0024] 3. The butt joint end faces of the two protective tubes are chamfered internally and externally respectively by synchronous feed, without the need to perform chamfering on the two protective tubes in batches, thereby improving the efficiency of the overall processing work and reducing the butt joint error caused by repeated measurement of the feed reference during batch chamfering. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the structure of an automatic cutting device for a protective tube in this application;

[0026] Figure 2 This is a cross-sectional view of the machine base of this application;

[0027] Figure 3For this application Figure 2 A partial enlarged view of the middle area A;

[0028] Figure 4 For this application Figure 2 A partial enlarged view of the middle area B;

[0029] Figure 5 This is a schematic diagram of the structure of the press frame of this application;

[0030] Figure 6 For this application Figure 5 A partial enlarged view of area C in the middle.

[0031] Explanation of the reference numerals: 1. base; 11. roller; 2. fixing mechanism; 21. rotating rod; 22. tightening block; 23. screw; 24. driven bevel gear; 25. rotating shaft; 26. driving bevel gear; 27. first motor; 3. driving mechanism; 31. second motor; 32. pulley; 4. cutting and chamfering mechanism; 41. linear drive; 42. cylinder; 43. push block; 44. cutting knife; 45. synchronous gear; 46. chamfering knife; 47. rack plate; 48. storage slot; 49. reset spring; 5. pressure frame; 51. air bag; 52. air guide tube; 53. pressure roller; 6. linkage plate; 7. limit spring. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the following will be combined with the appended drawings of the embodiments of the present application. Figure 1-6 , the technical scheme of the embodiment of the present application is clearly and completely described. Obviously, the described embodiment is a part of the embodiment of the present application, not all of the embodiments. Based on the described embodiment of the present application, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of this application.

[0033] Reference Figure 1 This embodiment provides an automatic cutting device for a protective tube, comprising a machine base 1, a limit assembly support, a fixing mechanism 2, a driving mechanism 3 and a cutting and chamfering mechanism 4. The fixing mechanism 2, the driving mechanism 3 and the cutting and chamfering mechanism 4 are all arranged on the machine base 1, and the fixing mechanism 2 is used to fix the protective tube placed horizontally, the driving mechanism 3 is used to drive the protective tube in a fixed state to rotate, and the cutting and chamfering mechanism 4 is used to cut and chamfer the protective tube.

[0034] Among them, refer to Figure 2 , Figure 4 and Figure 5The position limiting support assembly includes two pressing frames 5, two airbags 51, an air guide tube 52 and a plurality of pressing rollers 53. The two pressing frames 5 are longitudinally slidably connected to the machine base 1. The two airbags 51 are respectively arranged inside the two pressing frames 5. The air guide tube 52 is arranged through the machine base 1 and can communicate with the two airbags 51. Two pressing rollers 53 that can be pushed out by the airbags 51 are longitudinally slidably connected inside each pressing frame 5. Among them, the two pressing rollers 53 in the left pressing frame 5 can abut against the outer wall of the left protection tube, and the two pressing rollers 53 in the right pressing frame 5 can abut against the inner wall of the right protection tube.

[0035] When cutting the protective tube, the fixing mechanism 2 first fixes two standard length protective tubes, and then the driving mechanism 3 drives the fixed protective tube to rotate, and then the cutting and chamfering mechanism 4 cooperates to cut off the excess tube body of appropriate length from the outer end of a standard length protective tube according to the production requirements. After the personnel transfer the cut excess tube body, the cutting and chamfering mechanism 4 then chamfers the two protective tubes still on the fixing mechanism 2. During the chamfering process, the two pressing frames 5 will move accordingly to approach the inner and outer walls of the chamfered parts of the two protective tubes, and at the same time, the external gas is filled into the interior of the airbag 51 through the air guide tube 52. The pressure roller 53 will be pushed outwards until it is pressed against the protective tube under the expansion of the airbag 51. Because the inner and outer walls of the two protective tubes are both curved walls, under the action of the top thrust of the airbag 51, the longitudinal displacement distance of the pressure roller 53 inside the two pressing frames 5 will also be different to automatically adapt to and match the contact point of the curved wall of the protective tube.

[0036] The chamfer of the protection tube is supported during the chamfering process by an adaptive tightening method, which reduces the probability of radial deformation of the tube wall at the chamfer of the protection tube due to the pressure applied by the chamfering knife 46, and improves the docking accuracy of the two protection tubes during subsequent docking work.

[0037] Among them, refer to Figure 2 and Figure 3 The fixing mechanism 2 includes a rotating rod 21, a tightening block 22, a screw 23, a driven bevel gear 24, a rotating shaft 25, a driving bevel gear 26 and a first motor 27. Two rotating rods 21 are provided, and both rotating rods 21 are rotatably connected to the machine base 1. Each rotating rod 21 is radially slidably connected with a plurality of tightening blocks 22. Each rotating rod 21 is rotatably connected with a plurality of screws 23 that can correspond to the tightening blocks 22 one by one and drive the tightening blocks 22 to undergo radial displacement. Each screw 23 is provided with a driven bevel gear 24. A rotating shaft 25 is rotatably connected between the two rotating rods 21, and the rotating shaft 25 passes through the two rotating rods 21. Both ends of the rotating shaft 25 are provided with driving bevel gears 26 that can mesh with the driven bevel gear 24. The machine base 1 is provided with a first motor 27 that can drive the rotating shaft 25 to rotate.

[0038] After the protective tube is sleeved on the outside of the rotating rod 21, the first motor 27 is turned to drive the rotating shaft 25 to rotate. At this time, under the influence of the meshing connection relationship between the driven bevel gear 24 and the active bevel gear 26, the screw 23 will rotate accordingly to cause the tightening block 22 to move radially outward until the tightening block 22 tightens and fixes the protective tube from the inside.

[0039] Compared with the external clamping method, the protective tube is fixed by internal tightening. This can make the protective tube receive more uniform support force, reduce the probability of deformation of the protective tube due to uneven clamping force, and make it easy to center the protective tube, which is convenient for subsequent processing.

[0040] Among them, refer to Figure 2 and Figure 3 The driving mechanism 3 includes a second motor 31 and a pulley 32. The second motor 31 is arranged on the machine base 1, and the pulley 32 is arranged on the output shaft of the second motor 31, and the pulley 32 can be transmitted to the two rotating rods 21 through a belt.

[0041] When the second motor 31 is running, the rotating rod 21 can be rotated through the transmission of the pulley 32, and then the protective tube fixed on the rotating rod 21 can be rotated to cooperate with the subsequent cutting and chamfering work. The first motor 27 and the second motor 31 should use worm motors of the same specifications and with a self-locking function of the output shaft. When the first motor 27 drives the rotating shaft 25 to rotate, the second motor 31 is in a stopped state, which will make the rotating rod 21 unable to rotate. When the second motor 31 drives the rotating rod 21 to rotate through the pulley 32, the first motor 27 should run at the same speed and in the same direction as the second motor 31 to prevent the meshing state of the driven bevel gear 24 and the active bevel gear 26 from changing.

[0042] Among them, refer to Figure 2 and Figure 4The cutting and chamfering mechanism 4 includes a linear drive 41, a cylinder 42, a push block 43, a cutting knife 44, a synchronous gear 45, a chamfering knife 46, a rack plate 47, a receiving groove 48 and a return spring 49. The linear drive 41 is arranged on the machine base 1, the cylinder 42 is arranged at the execution end of the linear drive 41, the push block 43 is arranged at the execution end of the cylinder 42, and the cutting knife 44 is arranged on the push block 43; the synchronous gear 45 is rotatably connected to the machine base 1, and two chamfering knives 46 are provided and longitudinally slidably connected to the machine base 1. The two chamfering knives 46 are arranged symmetrically with respect to the synchronous gear 45 at one hundred and eighty degrees. The two chamfering knives 46 are provided with a rack plate 47 that can mesh with the synchronous gear 45. When the synchronous gear 45 rotates, the two chamfering knives 46 can be moved closer to each other or away from each other under the transmission of the two rack plates 47; a receiving groove 48 is provided on the chamfering knife 46 on the side close to the push block 43, and the receiving groove 48 can be used for the cutting knife 44 to be inserted, so that the push block 43 can drive the chamfering knife 46 to advance the displacement, and a reset spring 49 is arranged on the machine base 1, and the reset spring 49 can cause the chamfering knife 46 to retract.

[0043] After the linear actuator 41 drives the cylinder 42 to move to a suitable position, the cylinder 42 drives the push block 43 and the cutting knife 44 to move together in the direction close to the protective tube until the cutting knife 44 contacts the rotating protective tube to complete the cutting of the protective tube. Then, the cutting knife 44 is moved to a suitable position and inserted into the storage groove 48 through the cooperation of the linear actuator 41 and the cylinder 42 until the push block 43 contacts the chamfering knife 46 at this position. At this time, the cylinder 42 continues to extend to push the chamfering knife 46 to move longitudinally. At the same time, under the influence of the meshing relationship between the synchronous gear 45 and the rack plate 47, the two chamfering knives 46 will move towards each other to realize the synchronous feeding action until the chamfering knife 46 contacts the rotating protective tube to complete the chamfering of the protective tube.

[0044] In addition, refer to Figure 4 , Figure 5 and Figure 6 The pressing frame 5 is longitudinally slidably connected with a linkage plate 6 that can be fixedly connected to the chamfering knife 46, and a limit spring 7 is arranged between the pressing frame 5 and the linkage plate 6 to provide elastic displacement compensation for the pressing frame 5 when the chamfering knife 46 is displaced.

[0045] When the pressure roller 53 inside the pressure frame 5 does not contact the protective tube, the linkage plate 6 will move with the chamfering knife 46 and drive the pressure frame 5 to move together through the limit spring 7. During this process, the limit spring 7 is in an uncompressed state; on the contrary, when the pressure roller 53 inside the pressure frame 5 contacts the protective tube, as the chamfering knife 46 continues to advance, the linkage plate 6 will gradually compress the limit spring 7 when moving with the chamfering knife 46, and the pressure frame 5 will not move with the linkage plate 6, thereby providing elastic displacement compensation for the pressure frame 5 when the chamfering knife 46 moves.

[0046] By synchronously feeding, the butt joint end faces of the two protective tubes are chamfered internally and externally respectively, without the need to perform chamfering on the two protective tubes in batches, thereby improving the efficiency of the overall processing work and reducing the butt joint error caused by repeated measurement of the feed reference during multiple chamfering.

[0047] Reference Figure 1 Two rollers 11 are rotatably connected to the machine base 1 and can provide bearing for the protection tube.

[0048] During the processing of the protective tube, the roller 11 can provide bearing support for the protective tube, so that the cutting and chamfering work can be carried out stably.

[0049] The implementation principle of the automatic cutting device for protective tubes in the embodiment of the present application is as follows:

[0050] When cutting the protective tube, the protective tube is first sleeved on the outside of the rotating rod 21, and then the first motor 27 is turned to drive the rotating shaft 25 to rotate. At this time, under the influence of the meshing connection relationship between the driven bevel gear 24 and the active bevel gear 26, the screw rod 23 will rotate accordingly to cause the tightening block 22 to move radially outward until the tightening block 22 tightens and fixes the protective tube from the inside.

[0051] Then the second motor 31 drives the rotating rod 21 through the transmission of the pulley 32, thereby rotating the protective tube fixed on the rotating rod 21. Then the linear drive 41 drives the cylinder 42 to move to a suitable position. The cylinder 42 drives the push block 43 and the cutting knife 44 to move toward the direction close to the protective tube until the cutting knife 44 contacts the rotating protective tube to complete the cutting of the protective tube.

[0052] After the personnel transfer the excess tube body that has been cut off, the cutting knife 44 is moved to the appropriate position and inserted into the storage groove 48 through the cooperation of the linear drive 41 and the cylinder 42 until the push block 43 abuts against the chamfering knife 46 at this position. At this time, the cylinder 42 continues to extend to push the chamfering knife 46 to make a longitudinal feed displacement. At the same time, under the influence of the meshing relationship between the synchronous gear 45 and the rack plate 47, the two chamfering knives 46 will approach each other to achieve synchronous feed action until the chamfering knife 46 contacts the protective tube in a rotating state to complete the chamfering work of the protective tube.

[0053] During the chamfering process, the pressure frame 5 on the left side will move to a position close to the outer wall of the left protective tube, and the pressure frame 5 on the right side will move to a position close to the inner wall of the right protective tube. At the same time, external gas is filled into the interior of the airbag 51 through the air guide tube 52. Under the expansion of the airbag 51, the pressure rollers 53 inside the two pressure frames 5 will be pushed outward. Finally, the pressure rollers 53 inside the pressure frame 5 on the left side will press against the outer wall of the left protective tube, and the pressure rollers 53 inside the pressure frame 5 on the right side will press against the inner wall of the right protective tube. Because the inner and outer walls of the two protective tubes are both curved walls, under the action of the top thrust of the airbag 51, there will be a certain difference in the longitudinal displacement distances of the pressure rollers 53 inside the two pressure frames 5, so as to automatically adapt to and match the contact points of the curved walls of the protective tubes.

[0054] When the pressure roller 53 inside the pressure frame 5 does not contact the protective tube, the linkage plate 6 will move with the chamfering knife 46 and drive the pressure frame 5 to move together through the limit spring 7. During this process, the limit spring 7 is in an uncompressed state; on the contrary, when the pressure roller 53 inside the pressure frame 5 contacts the protective tube, as the chamfering knife 46 continues to advance, the linkage plate 6 will gradually compress the limit spring 7 when moving with the chamfering knife 46, and the pressure frame 5 will not move with the linkage plate 6, thereby providing elastic displacement compensation for the pressure frame 5 when the chamfering knife 46 moves.

[0055] In addition, it should be noted that in the description of this application, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0056] The above is a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles described in the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. An automatic cutting device for a protective tube, comprising a machine base, a fixing mechanism for fixing the protective tube and a cutting chamfering mechanism for cutting the protective tube, characterized in that: Also includes: There are two pressing frames, both of which are longitudinally slidably connected to the machine base and correspond to the inner and outer walls of the two protection tubes respectively. Air bags are arranged inside the pressing frames, and air guide tubes that can be connected to the two air bags are arranged through the machine base. Multiple pressing rollers that can be pushed out by the air bags are longitudinally slidably connected inside the pressing frames, so as to support the inner and outer walls of the protection tubes during the chamfering process. The fixing mechanism comprises: There are two rotating rods, which are rotatably connected to the machine base. Each rotating rod is radially slidably connected to a plurality of tightening blocks. Each rotating rod is rotatably connected to a plurality of screws that can correspond to the tightening blocks one by one and drive the tightening blocks to move radially. Each screw is provided with a driven bevel gear. A rotating shaft is rotatably connected between the two rotating rods and is arranged through the two rotating rods. Both ends of the rotating shaft are provided with driving bevel gears that can mesh with the driven bevel gears. A first motor that can drive the rotating shaft to rotate is arranged on the machine base. The cutting and chamfering mechanism comprises a linear drive arranged on a machine base, an execution end of the linear drive is provided with a cylinder, an execution end of the cylinder is provided with a push block, and a cutting knife is provided on the push block; The cutting and chamfering mechanism also includes a synchronous gear rotatably connected to the machine base, and two chamfering knives are longitudinally slidably connected to the machine base and are rotationally symmetrical by 180 degrees with the synchronous gear as a reference. The two chamfering knives are both provided with a rack plate that can mesh with the synchronous gear, so as to make the two chamfering knives approach each other or move away from each other. The chamfering knife on the side close to the push block is provided with a receiving groove for inserting the cutting knife, so that the push block can drive the chamfering knife to advance and move. A reset spring that can cause the chamfering knife to retreat is provided on the machine base.

2. The automatic cutting device for protective tube according to claim 1 is characterized in that: The machine base is rotatably connected to two rollers capable of providing bearing function for the protection tube.

3. The automatic cutting device for protective tube according to claim 1 is characterized in that: The machine base is provided with a driving mechanism for driving the protective tube in a fixed state to rotate.

4. The automatic cutting device for protective tube according to claim 3 is characterized in that: The driving mechanism comprises a second motor arranged on a machine base, and a pulley capable of transmitting power through a belt and two rotating rods is arranged on an output shaft of the second motor.

5. The automatic cutting device for protective tube according to claim 1, characterized in that: The pressing frame is longitudinally slidably connected with a linkage plate that can be fixedly connected to the chamfering knife, and a limit spring is arranged between the pressing frame and the linkage plate to provide elastic displacement compensation for the pressing frame when the chamfering knife is displaced.

Images