Pipe cutting device and pipe cutting method

Abstract

The present invention discloses a pipe cutting device and a method for cutting to length, wherein the pipe cutting device comprises a cutting mechanism, a clamping moving mechanism and a plurality of detection sensors; wherein the clamping moving mechanism is used to clamp the pipe and to move in the front-back direction to drive the pipe to move forward and backward, so that the pipe extends forward into the cutting mechanism, the cutting mechanism has a cutting position, the cutting mechanism is used to cut the pipe at the cutting position, the detection sensors are arranged in sequence from front to back behind the cutting mechanism along the length direction of the pipe, the detection sensors are located on one side of the pipe and are used to generate a signal when the pipe is detected. The present invention can cut the pipe to a fixed length without manual measurement and cutting, and is more convenient to use and operate.

Description

Technical Field

[0001] The invention relates to a pipe cutting-to-length device and a pipe cutting-to-length method. Background Art

[0002] At present, the lengths of pipes after forming vary, so it is necessary to cut the pipes into specified lengths according to demand. A Chinese patent with announcement number CN206047228U discloses a toothless saw pipe cutting device, which requires manual measurement of the size with a tape measure and marking on the pipe when cutting a pipe of a specified length, and then manual operation to cut the pipe at the marked position, which is complicated and inconvenient to use, especially when cutting pipes longer than 5 meters. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a pipe cutting device which can cut the pipe to a fixed length without manual measurement and cutting, and is more convenient to use.

[0004] In order to solve the above technical problems, the technical solution of the present invention is: a pipe cutting device, comprising a cutting mechanism, a clamping and moving mechanism and a plurality of detection sensors;

[0005] The clamping and moving mechanism is used to clamp the pipe and move in the front-rear direction to drive the pipe to move forward and backward, so that the pipe extends forward into the cutting mechanism;

[0006] The cutting mechanism has a cutting position, and the cutting mechanism is used to cut the pipe at the cutting position;

[0007] The detection sensors are arranged in sequence from front to back behind the cutting mechanism along the length direction of the pipe. The detection sensors are located on one side of the pipe and are used to generate signals when the pipe is detected.

[0008] Furthermore, the pipe cutting-to-length device also includes a driving mechanism, which is connected to the clamping and moving mechanism and is used to drive the clamping and moving mechanism to move in the front-rear direction.

[0009] Furthermore, the driving mechanism is a linear module.

[0010] Furthermore, the pipe cutting-to-length device further comprises a displacement sensor for monitoring the displacement of the clamping movable mechanism moving forward and backward so as to obtain the position of the clamping movable mechanism.

[0011] Furthermore, the pipe cutting-to-length device also includes a fixed clamping mechanism, which releases the pipe when the clamping movable mechanism clamps the pipe and moves forward and backward, and clamps the pipe to keep the pipe fixed when the clamping movable mechanism releases the pipe and moves backward.

[0012] The present invention also provides a cut-to-length method, which is implemented based on the pipe cut-to-length device, wherein the clamping moving mechanism has a front limit position during the forward movement, and the method comprises the following steps:

[0013] S1: Determine the target length L1 required after the pipe is cut, select the Nth detection sensor from the front to the back as the reference sensor according to the target length L1, and turn on the 1st to Nth detection sensors from the front to the back, and the distance between the reference sensor and the cutting position is L2; ​​wherein L2≥L1, and N is a positive integer;

[0014] S2: the clamping moving mechanism clamps the pipe and moves forward, thereby driving the pipe to move forward until the rear end of the pipe is aligned with the reference sensor;

[0015] S3: When L2=L1, execute step S5;

[0016] When L2>L1, execute step S4;

[0017] S4: Obtaining the distance L3 between the clamping moving mechanism and the front limit position at this time;

[0018] When L3≥L2-L1, the clamping movement mechanism keeps clamping the pipe and moves forward to drive the pipe to move forward a distance of L2-L1;

[0019] When L3 is less than L2-L1, the clamping mechanism reciprocates in the front-to-back direction. During the reciprocating movement, the clamping mechanism releases the pipe when moving backward and clamps the pipe when moving forward, thereby driving the pipe to intermittently move forward for a total distance of L2-L1.

[0020] S5: The cutting mechanism cuts the pipe at the cutting position.

[0021] Further, the clamping movement mechanism has a rear limit position during the process of moving backward, and the distance between the front limit position and the rear limit position is the stroke L0 of the clamping movement mechanism;

[0022] In step S4, when L3<L2-L1≤L3+L0, the clamping moving mechanism keeps clamping the pipe and moves forward to the front limit position, then the clamping moving mechanism releases the pipe and moves backward by a distance of L2-L1-L3, then the clamping moving mechanism re-clamps the pipe and moves forward to the front limit position;

[0023] When L2-L1>L3+L0, the clamping moving mechanism keeps clamping the pipe and moves forward to the front limit position, and then executes step M1 P times, and then the clamping moving mechanism releases the pipe and moves backward a distance Q, and then the clamping moving mechanism re-clamps the pipe and moves forward to the front limit position; wherein, step M1: the clamping moving mechanism releases the pipe and moves backward to the rear limit position and then clamps the pipe and moves forward to the front limit position; wherein, P and Q satisfy P×L0+Q+L3=L2-L1, and 0<Q≤L0, and P is a positive integer.

[0024] Further, in step S1, the distance from the N-1th detection sensor to the cutting position is L4; wherein L2≥L1>L4.

[0025] Furthermore, the detection sensors are arranged in sequence and at equal intervals along the front-to-back direction, and the interval between adjacent detection sensors is L2-L4;

[0026] The clamping moving mechanism has a rear limit position during the backward movement, and the distance between the front limit position and the rear limit position is the stroke L0 of the clamping moving mechanism; wherein L2-L4≤L0;

[0027] In step S4, when L3 ≥ L2 - L1, the clamping movement mechanism keeps clamping the pipe and moves forward to drive the pipe to move forward a distance of L2 - L1;

[0028] When L3<L2-L1, the clamping moving mechanism keeps clamping the pipe and moves forward to the front limit position, then releases the pipe and moves backward a distance of L2-L1-L3, then clamps the pipe again and moves forward to the front limit position.

[0029] Further, when the pipe is located at the initial position, the reference sensor detects the pipe and generates a signal;

[0030] The specific steps of step S2 are:

[0031] The clamping movable mechanism clamps the tube and moves forward, thereby driving the tube to be transported forward. When the reference sensor cannot detect the tube and the signal generated by the reference sensor disappears, the clamping movable mechanism stops moving forward and moves backward, thereby driving the tube to move backward. Then, when the reference sensor detects the tail end of the tube again and generates a signal, the clamping movable mechanism stops moving. At this time, the tail end of the tube is aligned with the reference sensor.

[0032] After adopting the above technical solution, first determine the target length L1 required after the pipe is cut, select the Nth detection sensor from the front to the back as the reference sensor according to the target length L1, and turn on the 1st to Nth detection sensors from the front to the back, and the distance between the reference sensor and the cutting position is L2; ​​wherein, L2≥L1, N is a positive integer, the length of L1 is given according to the needs, and the length of L2 is known. Then, the clamping moving mechanism clamps the pipe and moves forward, thereby driving the pipe forward until the tail end of the pipe is aligned with the reference sensor, at which time the distance between the tail end of the pipe and the cutting position is equal to the distance L2 between the reference sensor and the cutting position. Then, if L2=L1, the pipe is cut at the cutting position by the cutting mechanism, and a finished pipe with a length of L1 can be cut. If L2>L1, the clamping moving mechanism is moved forward and backward, and the clamping moving mechanism releases the tube when moving backward and clamps the tube when moving forward, thereby driving the tube to move forward once or multiple times for a total distance of L2-L1, so that the distance between the tail end of the tube and the cutting position is L1, and then the cutting mechanism cuts the tube at the cutting position, and the length of the remaining tube is L1, thereby completing the fixed-length cutting of the tube, without the need for manual measurement and then cutting, and is more convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A top view of the pipe cutting device of the present invention;

[0034] Figure 2 It is a top view of the pipe in the pipe length cutting device of the present invention when the pipe is in the initial position;

[0035] Figure 3 It is a top view of the pipe when the tail end of the pipe is aligned with the reference sensor in the pipe cutting device of the present invention;

[0036] Figure 4 It is a top view of the pipe when the pipe is moved forward into position in the pipe cutting device of the present invention. DETAILED DESCRIPTION

[0037] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments in conjunction with the accompanying drawings.

[0038] Embodiment 1: Figures 1 to 4 As shown, a pipe cutting device comprises a cutting mechanism 1, a clamping and moving mechanism 2 and a plurality of detection sensors 3;

[0039] The clamping and moving mechanism 2 is used to clamp the pipe 4 and to move in the front-rear direction, thereby driving the pipe 4 to move forward and backward, so that the pipe 4 extends forward into the cutting mechanism 1;

[0040] The cutting mechanism 1 has a cutting position 5, and the cutting mechanism 1 is used to cut the pipe 4 at the cutting position 5;

[0041] The detection sensors 3 are arranged in sequence from front to back behind the cutting mechanism 1 along the length direction of the tube 4 . The detection sensors 3 are located on one side of the tube 4 and are used to generate signals when the tube 4 is detected.

[0042] Specifically, first determine the target length L1 required after the pipe 4 is cut, select the Nth detection sensor 3 from the front to the back as the reference sensor according to the target length L1, and turn on the 1st to Nth detection sensors 3 from the front to the back, and the distance between the reference sensor and the cutting position 5 is L2; ​​wherein L2 ≥ L1, N is a positive integer, the length of L1 is given according to the needs, and the length of L2 is known. Then the clamping moving mechanism 2 clamps the pipe 4 and moves forward, thereby driving the pipe 4 to move forward until the tail end of the pipe 4 is aligned with the reference sensor. At this time, Figure 3 As shown, the distance between the tail end of the pipe 4 and the cutting position 5 is equal to the distance L2 between the reference sensor and the cutting position 5. Then, if L2=L1, the pipe 4 is cut at the cutting position 5 by the cutting mechanism 1, and the finished pipe 4 with a length of L1 can be cut. If L2>L1, the clamping moving mechanism 2 is moved forward and backward, and the clamping moving mechanism 2 releases the pipe 4 when moving backward and clamps the pipe 4 when moving forward, thereby driving the pipe 4 to move forward once or multiple times for a total of L2-L1, so that the distance between the tail end of the pipe 4 and the cutting position 5 is L1, and then the cutting mechanism 1 cuts the pipe 4 at the cutting position 5, and the length of the remaining pipe 4 is L1, thereby completing the fixed-length cutting of the pipe 4, without the need for manual measurement and cutting, and the use and operation are more convenient.

[0043] In this embodiment, the cutting mechanism 1 has a cutting saw for cutting the pipe 4, the cutting saw has a saw blade, and the cutting position 5 is the position of the saw blade. The detection sensor 3 can be a photoelectric switch, and the clamping movement mechanism 2 is arranged behind the cutting mechanism 1.

[0044] Specifically, the pipe cutting device may further include a driving mechanism, which is connected to the clamping movable mechanism 2 and is used to drive the clamping movable mechanism 2 to move in the front-rear direction, thereby driving the pipe 4 clamped by the clamping movable mechanism 2 to move forward and backward.

[0045] In this embodiment, the driving mechanism is a linear module; specifically, the linear module is used to accurately drive the clamping movable mechanism 2 to move in the forward and backward directions. The linear module has an encoder, and the encoder can monitor the displacement change of the clamping movable mechanism 2 driven by the linear module to move forward and backward, so as to obtain the position of the clamping movable mechanism 2 in real time.

[0046] Specifically, the pipe cutting-to-length device may further include a displacement sensor for monitoring the displacement of the clamping movable mechanism 2 moving forward and backward so as to obtain the position of the clamping movable mechanism 2; wherein the displacement sensor may be a grating ruler.

[0047] Specifically, the pipe cutting device may further include a fixed clamp mechanism, which releases the pipe 4 when the clamping moving mechanism 2 clamps the pipe 4 and moves forward and backward, and clamps the pipe 4 to keep the pipe 4 fixed when the clamping moving mechanism 2 releases the pipe 4 and moves backward; wherein, in this embodiment, a frame is also included, and the clamping moving mechanism 2 and the fixed clamp mechanism respectively include a base, a fixed clamp block, a movable clamp block and a cylinder; the fixed clamp block is connected to the base, the movable clamp block is connected to the cylinder, and the cylinder is connected to the base, and the cylinder is used to drive the movable clamp block to move toward the fixed clamp block so that the fixed clamp block and the movable clamp block clamp the pipe 4. wherein, the base in the fixed clamp mechanism is fixedly connected to the frame, the base in the clamping moving mechanism 2 is slidably connected to the frame in the forward and backward direction, and the driving mechanism is connected to the frame and is connected to the base in the clamping moving mechanism 2, so that the driving mechanism drives the entire clamping moving mechanism 2 to move in the forward and backward direction.

[0048] Embodiment 2: A method for cutting to length, which is implemented based on the pipe cutting to length device as described in Embodiment 1, wherein the clamping moving mechanism 2 has a front limit position during the forward movement, and the method comprises the following steps:

[0049] S1: Determine the target length L1 required after the pipe 4 is cut, select the Nth detection sensor 3 from the front to the back as the reference sensor according to the target length L1, and turn on the 1st to Nth detection sensors 3 from the front to the back, and the distance between the reference sensor and the cutting position 5 is L2; ​​wherein L2≥L1, N is a positive integer, at this time Figure 2 As shown, the length of L1 is given as needed, and the length of L2 is known;

[0050] S2: The clamping moving mechanism 2 clamps the pipe 4 and moves forward, thereby driving the pipe 4 to move forward until the tail end of the pipe 4 is aligned with the reference sensor. Figure 3 As shown, the distance between the tail end of the tube 4 and the cutting position 5 is equal to the distance L2 between the reference sensor and the cutting position 5;

[0051] S3: When L2=L1, execute step S5, and then cut to obtain a finished pipe 4 with a length of L1;

[0052] When L2>L1, execute step S4;

[0053] S4: Obtaining the distance L3 between the clamping moving mechanism 2 and the front limit position at this time;

[0054] When L3≥L2-L1, the clamping moving mechanism 2 keeps clamping the tube 4 and moves forward to drive the tube 4 to move forward a distance of L2-L1. At this time, the distance between the tail end of the tube 4 and the cutting position 5 is L1;

[0055] When L3 is less than L2-L1, the clamping moving mechanism 2 reciprocates in the front-to-back direction. During the reciprocating movement, the clamping moving mechanism 2 releases the tube 4 when moving backward and clamps the tube 4 when moving forward, thereby driving the tube 4 to intermittently move forward a total distance of L2-L1, so that the distance between the tail end of the tube 4 and the cutting position 5 is L1;

[0056] S5: The cutting mechanism 1 cuts the tube 4 at the cutting position 5, and the length of the remaining tube 4 is L1.

[0057] In this embodiment, the forward and backward movement of the clamping moving mechanism 2 is driven by the driving mechanism, and the driving mechanism can be a linear module. Specifically, in step S4, the displacement change of the clamping moving mechanism 2 driven by the linear module to move forward and backward can be monitored by the encoder in the linear module, and then the position of the clamping moving mechanism 2 can be obtained in real time. The displacement of the clamping moving mechanism 2 can also be monitored by a displacement sensor to obtain the position of the clamping moving mechanism 2. After obtaining the current position of the clamping moving mechanism 2, the distance L3 of the clamping moving mechanism 2 from the front limit position can be obtained.

[0058] like Figures 2~4 As shown, the clamping movement mechanism 2 has a rear limit position during the backward movement, and the distance between the front limit position and the rear limit position is the stroke L0 of the clamping movement mechanism 2;

[0059] In step S4, when L3<L2-L1≤L3+L0, the clamping moving mechanism 2 keeps clamping the pipe 4 and moves forward to the front limit position, then the clamping moving mechanism 2 releases the pipe 4 and moves backward by a distance of L2-L1-L3, then the clamping moving mechanism 2 re-clamps the pipe 4 and moves forward to the front limit position; in the above process, the clamping moving mechanism 2 drives the pipe 4 forward by L3 during the first forward movement to the front limit position, and drives the pipe 4 forward by L2-L1-L3 during the second forward movement to the front limit position, thus driving the pipe 4 forward by a distance of L2-L1 in total;

[0060] In step S4, when L2-L1>L3+L0, the clamping moving mechanism 2 keeps clamping the pipe 4 and moves forward to the front limit position, and then executes step M1 P times, and then the clamping moving mechanism 2 releases the pipe 4 and moves backward a distance Q, and then the clamping moving mechanism 2 re-clamps the pipe 4 and moves forward to the front limit position; wherein, step M1: the clamping moving mechanism 2 releases the pipe 4 and moves backward to the rear limit position and then clamps the pipe 4 and moves forward to the front limit position; wherein In the above process, P and Q satisfy P×L0+Q+L3=L2-L1, and 0<Q≤L0, P is a positive integer; in the process described above, the clamping moving mechanism 2 drives the pipe 4 forward by L3 during the first forward movement to the front limit position, drives the pipe 4 forward by P×L0 during the execution of P steps M1, and drives the pipe 4 forward by Q during the last forward movement to the front limit position, so the total forward movement distance of the pipe 4 is L3+P×L0+Q=L2-L1.

[0061] like Figures 2~4As shown, when the pipe 4 is located at the initial position, the reference sensor detects the pipe 4 and generates a signal; wherein the specific steps of step S2 are:

[0062] The clamping movable mechanism 2 clamps the tube 4 and moves forward, thereby driving the tube 4 to be transported forward. When the reference sensor cannot detect the tube 4 and the signal generated by the reference sensor disappears, the clamping movable mechanism 2 stops moving forward and moves backward, thereby driving the tube 4 to move backward. Then, when the reference sensor detects the tail end of the tube 4 again and generates a signal, the clamping movable mechanism 2 stops moving. At this time, the tail end of the tube 4 is aligned with the reference sensor.

[0063] Embodiment 3: A method for cutting to length, which is implemented based on the pipe cutting to length device as described in Embodiment 1, wherein the clamping moving mechanism 2 has a front limit position during the forward movement, and the method comprises the following steps:

[0064] S1: Determine the target length L1 required after the pipe 4 is cut, select the Nth detection sensor 3 from the front to the back as the reference sensor according to the target length L1, and turn on the 1st to Nth detection sensors 3 from the front to the back, and the distance between the reference sensor and the cutting position 5 is L2; ​​wherein L2≥L1, N is a positive integer, at this time Figure 2 As shown, the length of L1 is given as needed, and the length of L2 is known;

[0065] S2: The clamping moving mechanism 2 clamps the pipe 4 and moves forward, thereby driving the pipe 4 to move forward until the tail end of the pipe 4 is aligned with the reference sensor. Figure 3 As shown, the distance between the tail end of the tube 4 and the cutting position 5 is equal to the distance L2 between the reference sensor and the cutting position 5;

[0066] S3: When L2=L1, execute step S5, and then cut to obtain a finished pipe 4 with a length of L1;

[0067] When L2>L1, execute step S4;

[0068] S4: Obtaining the distance L3 between the clamping moving mechanism 2 and the front limit position at this time;

[0069] When L3≥L2-L1, the clamping moving mechanism 2 keeps clamping the tube 4 and moves forward to drive the tube 4 to move forward a distance of L2-L1. At this time, the distance between the tail end of the tube 4 and the cutting position 5 is L1;

[0070] When L3 is less than L2-L1, the clamping moving mechanism 2 reciprocates in the front-to-back direction. During the reciprocating movement, the clamping moving mechanism 2 releases the tube 4 when moving backward and clamps the tube 4 when moving forward, thereby driving the tube 4 to intermittently move forward a total distance of L2-L1, so that the distance between the tail end of the tube 4 and the cutting position 5 is L1;

[0071] S5: The cutting mechanism 1 cuts the pipe 4 at the cutting position 5. The length of the remaining pipe 4 is L1.

[0072] In this embodiment, the forward and backward movement of the clamping moving mechanism 2 is driven by the driving mechanism, and the driving mechanism can be a linear module. Specifically, in step S4, the displacement change of the clamping moving mechanism 2 driven by the linear module to move forward and backward can be monitored by the encoder in the linear module, and then the position of the clamping moving mechanism 2 can be obtained in real time. The displacement of the clamping moving mechanism 2 can also be monitored by a displacement sensor to obtain the position of the clamping moving mechanism 2. After obtaining the current position of the clamping moving mechanism 2, the distance L3 of the clamping moving mechanism 2 from the front limit position can be obtained.

[0073] like Figures 2~4 As shown, in step S1, the distance between the N-1th detection sensor 3 and the cutting position 5 is L4; wherein, L2≥L1>L4; specifically, the length of L4 is known, and the distance between each detection sensor 3 and the cutting position 5 is known. Further specifically, during normal operation, the signals of the detection sensors 3 from the 1st to the N-1th detection sensors 3 should be continuous. If the signal of any at least one of the detection sensors 3 from the 1st to the N-1th detection sensors 3 disappears, it means that the detection sensor 3 is faulty, and an alarm shutdown is required.

[0074] like Figures 2~4 As shown, the detection sensors 3 are arranged in sequence and equidistantly along the front-to-back direction, and the spacing between adjacent detection sensors 3 is L2-L4;

[0075] The clamping moving mechanism 2 has a rear limit position during the backward movement, and the distance between the front limit position and the rear limit position is the stroke L0 of the clamping moving mechanism 2; wherein L2-L4≤L0;

[0076] In step S4, when L3≥L2-L1, the clamping moving mechanism 2 keeps clamping the tube 4 and moves forward to drive the tube 4 to move forward a distance of L2-L1. At this time, the distance between the tail end of the tube 4 and the cutting position 5 is L1;

[0077] In step S4, when L3<L2-L1, the clamping movable mechanism 2 keeps clamping the tube 4 and moves forward to the front limit position, then the clamping movable mechanism 2 releases the tube 4 and moves backward a distance of L2-L1-L3, then the clamping movable mechanism 2 re-clamps the tube 4 and moves forward to the front limit position; in the above process, the clamping movable mechanism 2 drives the tube 4 forward by L3 during the first forward movement to the front limit position, and drives the tube 4 forward by L2-L1-L3 during the second forward movement to the front limit position, thus driving the tube 4 forward by a total distance of L2-L1, so that the distance between the tail end of the tube 4 and the cutting position 5 is L1, and the remaining length of the tube 4 after being cut is L1. In this embodiment, since L2-L4≤L0 and L1>L4, it can be obtained that L2-L1<L0, and then L2-L1-L3<L0, so in step S4, when L3<L2-L1, the distance L2-L1-L3 that the clamping moving mechanism 2 releases the pipe 4 and moves backward is less than the stroke L0 of the clamping moving mechanism 2 moving forward and backward. Therefore, in this embodiment, no matter how much the target length L1 required after the pipe 4 is cut, the clamping moving mechanism 2 only needs to move backward once and then move forward to the front limit position to be able to transport the pipe 4 forward to the position. In this embodiment, the forward and backward movements of the clamping moving mechanism 2 are driven by the driving mechanism, and the driving mechanism can be a linear module.

[0078] like Figures 2~4 As shown, when the pipe 4 is located at the initial position, the reference sensor detects the pipe 4 and generates a signal; wherein the specific steps of step S2 are:

[0079] The clamping movable mechanism 2 clamps the tube 4 and moves forward, thereby driving the tube 4 to be transported forward. When the reference sensor cannot detect the tube 4 and the signal generated by the reference sensor disappears, the clamping movable mechanism 2 stops moving forward and moves backward, thereby driving the tube 4 to move backward. Then, when the reference sensor detects the tail end of the tube 4 again and generates a signal, the clamping movable mechanism 2 stops moving. At this time, the tail end of the tube 4 is aligned with the reference sensor.

[0080] In this embodiment, the target length L1 required after the pipe 4 is cut is 6000mm. The fourth detection sensor 3 from the front to the back is selected as the reference sensor and the first to fourth detection sensors 3 from the front to the back are turned on. The distance L2 between the reference sensor and the cutting position 5 is 7500mm, and the stroke L0 of the clamping moving mechanism 2 is 1600mm. First, the clamping moving mechanism 2 clamps the pipe 4 and moves forward, thereby driving the pipe 4 to move forward until the tail end of the pipe 4 is aligned with the reference sensor. At this time, the distance between the tail end of the pipe 4 and the cutting position 5 is 7500mm. In order to cut a pipe 4 with a length L1 of 6000mm, the pipe 4 needs to be transported forward by 7500-6000=1500mm. At this time, the distance L3 between the clamping mechanism 2 and the front limit position is 1233mm. Since L3 < L2-L1, the clamping mechanism 2 keeps clamping the pipe 4 and moves forward to the front limit position. Then the clamping mechanism 2 releases the pipe 4 and moves backward 267mm. Then the clamping mechanism 2 clamps the pipe 4 again and moves forward to the front limit position. In the above process, the clamping mechanism 2 moves forward to the front limit position for the first time, and the pipe 4 moves forward 267mm during the second time the clamping mechanism 2 moves forward to the front limit position. Therefore, the pipe 4 is moved forward a total of 1500mm, and the distance between the tail end of the pipe 4 and the cutting position 5 becomes 6000mm. Then the cutting mechanism 1 cuts the pipe 4 at the cutting position 5, and the remaining length of the pipe 4 after cutting is 6000mm.

[0081] In summary, first determine the target length L1 required after the pipe 4 is cut, select the Nth detection sensor 3 from the front to the back as the reference sensor according to the target length L1, and turn on the 1st to Nth detection sensors 3 from the front to the back, and the distance between the reference sensor and the cutting position 5 is L2; ​​wherein, L2≥L1, N is a positive integer, the length of L1 is given according to the needs, and the length of L2 is known. Then, the clamping moving mechanism 2 clamps the pipe 4 and moves forward, thereby driving the pipe 4 to move forward until the tail end of the pipe 4 is aligned with the reference sensor, at which time the distance between the tail end of the pipe 4 and the cutting position 5 is equal to the distance L2 between the reference sensor and the cutting position 5. Then, if L2=L1, the pipe 4 is cut at the cutting position 5 by the cutting mechanism 1, and a finished pipe 4 with a length of L1 can be cut. If L2>L1, the clamping movable mechanism 2 is moved forward and backward, and the clamping movable mechanism 2 releases the tube 4 when moving backward and clamps the tube 4 when moving forward, thereby driving the tube 4 to move forward once or multiple times for a total distance of L2-L1, so that the distance between the tail end of the tube 4 and the cutting position 5 is L1, and then the cutting mechanism 1 cuts the tube 4 at the cutting position 5, and the length of the remaining tube 4 is L1, thereby completing the fixed-length cutting of the tube 4, without the need for manual measurement and then cutting, and is more convenient to use.

[0082] The specific embodiments described above further illustrate the technical problems, technical solutions and beneficial effects solved by the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A cut-to-length method based on a pipe cut-to-length device, characterized in that: The pipe cutting device comprises a cutting mechanism (1), a clamping and moving mechanism (2) and a plurality of detection sensors (3); The clamping movement mechanism (2) is used to clamp the pipe (4) and to move in the front-rear direction, thereby driving the pipe (4) to move back and forth, so that the pipe (4) extends forward into the cutting mechanism (1); The cutting mechanism (1) has a cutting position (5), and the cutting mechanism (1) is used to cut the pipe (4) at the cutting position (5); The detection sensors (3) are arranged in sequence from front to back along the length direction of the pipe (4) behind the cutting mechanism (1); the detection sensors (3) are located on one side of the pipe (4) and are used to generate a signal when the pipe (4) is detected; The clamping movement mechanism (2) has a front limit position during the forward movement; The steps of the method include: S1: Determine the target length L1 required after the pipe (4) is cut, select the Nth detection sensor (3) from the front to the back as the reference sensor according to the target length L1, and turn on the 1st to Nth detection sensors (3) from the front to the back, and the distance between the reference sensor and the cutting position (5) is L2; ​​wherein L2≥L1, and N is a positive integer; S2: the clamping moving mechanism (2) clamps the tube (4) and then moves forward, thereby driving the tube (4) to move forward until the rear end of the tube (4) is aligned with the reference sensor; S3: When L2=L1, execute step S5; When L2>L1, execute step S4; S4: obtaining the distance L3 between the clamping moving mechanism (2) and the front limit position at this time; When L3≥L2-L1, the clamping movement mechanism (2) keeps clamping the pipe (4) and moves forward to drive the pipe (4) to move forward a distance of L2-L1; When L3 is less than L2-L1, the clamping moving mechanism (2) moves back and forth in the front-back direction. During the back-and-forth reciprocating movement, the clamping moving mechanism (2) releases the pipe (4) when moving backward and clamps the pipe (4) when moving forward, thereby driving the pipe (4) to intermittently move forward a total distance of L2-L1; S5: The cutting mechanism (1) cuts the pipe (4) at the cutting position (5).

2. The cut-to-length method according to claim 1, characterized in that: The clamping movement mechanism (2) has a rear limit position during the process of moving backwards, and the distance between the front limit position and the rear limit position is the stroke L0 of the clamping movement mechanism (2); In step S4, when L3<L2-L1≤L3+L0, the clamping moving mechanism (2) keeps clamping the pipe (4) and moves forward to the front limit position, then the clamping moving mechanism (2) releases the pipe (4) and moves backward by a distance of L2-L1-L3, then the clamping moving mechanism (2) clamps the pipe (4) again and moves forward to the front limit position; When L2-L1>L3+L0, the clamping moving mechanism (2) keeps clamping the pipe (4) and moves forward to the front limit position, and then executes step M1 P times, and then the clamping moving mechanism (2) releases the pipe (4) and moves backward a distance Q, and then the clamping moving mechanism (2) re-clamps the pipe (4) and moves forward to the front limit position; wherein, step M1: the clamping moving mechanism (2) releases the pipe (4) and moves backward to the rear limit position and then clamps the pipe (4) and moves forward to the front limit position; wherein, P and Q satisfy P×L0+Q+L3=L2-L1, and 0<Q≤L0, and P is a positive integer.

3. The cut-to-length method according to claim 1, characterized in that: In step S1, the distance from the N-1th detection sensor (3) to the cutting position (5) is L4; wherein L2≥L1>L4.

4. The cut-to-length method according to claim 3, characterized in that: The detection sensors (3) are arranged in sequence and at equal intervals along the front-to-back direction, and the spacing between adjacent detection sensors (3) is L2-L4; The clamping moving mechanism (2) has a rear limit position during the process of moving backwards, and the distance between the front limit position and the rear limit position is the stroke L0 of the clamping moving mechanism (2); wherein L2-L4≤L0; In step S4, when L3≥L2-L1, the clamping movement mechanism (2) keeps clamping the pipe (4) and moves forward to drive the pipe (4) to move forward a distance of L2-L1; When L3<L2-L1, the clamping moving mechanism (2) keeps clamping the pipe (4) and moves forward to the front limit position, then the clamping moving mechanism (2) releases the pipe (4) and moves backward a distance of L2-L1-L3, then the clamping moving mechanism (2) clamps the pipe (4) again and moves forward to the front limit position.

5. The cut-to-length method according to claim 1, characterized in that: When the pipe (4) is located at the initial position, the reference sensor detects the pipe (4) and generates a signal; The specific steps of step S2 are: The clamping movable mechanism (2) clamps the tube (4) and moves forward, thereby driving the tube (4) to be transported forward. When the reference sensor cannot detect the tube (4) and the signal generated by the reference sensor disappears, the clamping movable mechanism (2) stops moving forward and moves backward, thereby driving the tube (4) to move backward. Then, when the reference sensor detects the tail end of the tube (4) again and generates a signal, the clamping movable mechanism (2) stops moving. At this time, the tail end of the tube (4) is aligned with the reference sensor.

6. The cut-to-length method according to claim 1, characterized in that: The pipe cutting-to-length device further comprises a driving mechanism, which is connected to the clamping and moving mechanism (2) and is used to drive the clamping and moving mechanism (2) to move in a front-rear direction.

7. The cut-to-length method according to claim 6, characterized in that: The driving mechanism is a linear module.

8. The cut-to-length method according to claim 1, characterized in that: The pipe cutting-to-length device further comprises a displacement sensor for monitoring the displacement of the clamping movable mechanism (2) moving forward and backward so as to obtain the position of the clamping movable mechanism (2).

9. The cut-to-length method according to claim 1, characterized in that: The pipe cutting device also comprises a fixedly arranged fixing clamp mechanism, which releases the pipe (4) when the clamping movable mechanism (2) clamps the pipe (4) and moves forward and backward, and clamps the pipe (4) to keep the pipe (4) fixed when the clamping movable mechanism (2) releases the pipe (4) and moves backward.

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