Steel pipe cutting device

Abstract

The invention provides a steel pipe cutting device, and belongs to the technical field of steel pipe machining. The grabbing mechanism grabs a steel pipe on the feeding mechanism and places the steel pipe on the clamping platform, the clamping platform is provided with a reciprocating cutting device in a matched mode, the reciprocating cutting device comprises a cutting guide rod, a cutting saw and a pressing block, the cutting saw moves back and forth along the cutting guide rod, and the pressing block is arranged on the cutting guide rod. The pressing block applies pressure towards the steel pipe to the cutting saw, and the cutting saw cuts the steel pipe; steel pipes are conveyed through the feeding mechanism, the situation that in the conveying process, the steel pipes collide, and consequently coating layers or spraying layers on the surfaces of the steel pipes are damaged is avoided, the reciprocating cutting device cuts the steel pipes in the process that a cutting saw moves back and forth along a cutting guide rod, and in the process that the cutting saw cuts the steel pipes, a pressing block continuously applies pressure to the steel pipes; and cutting is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of steel pipe processing, in particular to a steel pipe cutting device. Background Art

[0002] Steel pipes have been widely used in the fields of liquid transportation and frame construction. In order to increase the life and corrosion resistance of steel pipes and increase the strength of steel pipes, they are coated or sprayed before leaving the factory. The coating or spray layer of the steel pipe will fail under high temperature. Once the coating or spray layer of the steel pipe fails, the corrosion resistance or strength of the steel pipe will be weakened. The coating or spray layer on the surface of the steel pipe is usually damaged during the transportation and cutting of the steel pipe. For example, there is a bump or heavy blow during transportation, the cutting knife damages the surface of the steel pipe during cutting, or the cutting temperature is high, causing the original structure of the coating or spray layer to be destroyed. In order to pursue cutting efficiency, electric saws are often used for cutting steel pipes. Electric saws have high speed and high cutting efficiency. At the same time, high temperature is generated during the cutting process. High temperature has a certain impact on the coating and spray layer of the steel pipe. Secondly, the saw blade of the electric saw is easy to bend under the action of cutting resistance after entering the steel pipe, resulting in uneven end surface of the cut steel pipe.

[0003] Therefore, there is an urgent need for an automatic cutting device that causes less damage to the surface of the steel pipe during the steel pipe cutting process. Summary of the invention

[0004] In view of this, the present invention proposes an automatic cutting device which can automatically feed, accurately grasp and cut, and reduce damage to the coating layer and spray layer on the surface of the steel pipe.

[0005] The technical solution of the present invention is implemented as follows: a steel pipe cutting device includes a grabbing mechanism, a feeding mechanism, and a clamping platform. The grabbing mechanism grabs the steel pipe on the feeding mechanism and places it on the clamping platform. The clamping platform is equipped with a reciprocating cutting device. The reciprocating cutting device includes a cutting guide rod, a cutting saw and a pressure block. The cutting saw moves back and forth along the cutting guide rod. The pressure block is arranged on the cutting guide rod. The pressure block applies pressure to the cutting saw toward the steel pipe, and the cutting saw cuts the steel pipe.

[0006] On the basis of the above technical solution, preferably, the reciprocating cutting device further comprises a sliding member, the sliding member is slidably arranged on the cutting guide rod, and the cutting saw is fixedly connected to the sliding member.

[0007] On the basis of the above technical solution, preferably, the reciprocating cutting device further comprises a gravity adjustment rod, the gravity adjustment rod is arranged along the cutting guide rod, and the gravity adjustment rod is arranged in cooperation with the pressing block thread.

[0008] On the basis of the above technical solution, preferably, adjustment seats are provided between both ends of the gravity adjustment rod and the cutting guide rod, and the sliding member is provided between the two adjustment seats.

[0009] On the basis of the above technical solution, preferably, the reciprocating cutting device also includes a support rod and a first cylinder, one end of the support rod is hinged to the cutting guide rod, and the first cylinder is hinged to the other end of the cutting guide rod.

[0010] On the basis of the above technical solution, preferably, the reciprocating cutting device also includes a power device and a power transmission device, the power transmission device includes a first articulated rod, a second articulated rod and a rotating wheel, one end of the first articulated rod is hinged to the cutting saw, the other end of the first articulated rod is hinged to the second articulated rod, the output end of the power device is connected to the rotating wheel, one end of the second articulated rod away from the first articulated rod is hinged to the rotating wheel, and the first articulated rod is away from the center of the rotating wheel.

[0011] On the basis of the above technical scheme, preferably, the feeding mechanism includes a feeding frame, a feed rod, a horizontal feeding rod, a discharging rod and a propulsion mechanism, the feed rod, the horizontal feeding rod, the discharging rod and the propulsion mechanism are all arranged on the feeding frame, and the propulsion mechanism is arranged in cooperation with the horizontal feeding rod; the horizontal feeding rods are two parallelly arranged, and each horizontal feeding rod is evenly provided with a number of stop blocks; one end of the feed rod is connected to one end of the horizontal feeding rod, and the other end of the feed rod is higher than the horizontal feeding rod, one end of the discharging rod is connected to the other end of the horizontal feeding rod, and the other end of the discharging rod is provided with a discharging stop block.

[0012] On the basis of the above technical solution, preferably, the propulsion mechanism includes two propulsion plates arranged parallel to each other and two flip rods located in the same plane, and the flip rod passes through the two propulsion plates, one end of which is rotatably set on one of the propulsion plates, and the other end is rotatably set on the other propulsion plate.

[0013] On the basis of the above technical solution, preferably, the flip rod includes a connecting portion, a first bending portion, a second bending portion and a mounting portion, the first bending portion is arranged at both ends of the connecting portion, the second bending portion is arranged at the end of the first bending portion, the second bending portion is connected to the mounting portion, the connecting portion is arranged perpendicularly to the first bending portion, the first bending portion is arranged perpendicularly to the second bending portion, and the connecting portion, the first bending portion, the second bending portion and the mounting portion are arranged in the same plane.

[0014] On the basis of the above technical solution, preferably, the propulsion mechanism further includes a driving device, a conveying transmission wheel and a conveyor belt, the conveying transmission wheel is arranged on the mounting portion, and the conveyor belt is wound between the driving device and the conveying transmission wheel.

[0015] The steel pipe cutting device of the present invention has the following beneficial effects compared with the prior art: The steel pipe is transported by a feeding mechanism, which avoids collision of the steel pipe during transportation, resulting in damage to the coating layer or spray layer on the surface of the steel pipe. The reciprocating cutting device cuts the steel pipe by a cutting saw moving back and forth along a cutting guide rod. During the process of the cutting saw cutting the steel pipe, the pressure block continuously applies pressure to the steel pipe to facilitate cutting, while avoiding the movement of the cutting saw during the cutting process, resulting in a reduction in cutting accuracy. The cutting process is slow, which avoids high temperature during the cutting process from damaging the coating layer or spray layer on the surface of the steel pipe, and further protects the coating layer and spray layer on the surface of the steel pipe. During the cutting process of the cutting saw, the cutting guide rod is used for cutting guidance, and the end face of the cut steel pipe is smoother. The sliding member is slidably arranged on the cutting guide rod, the cutting saw is fixedly connected to the sliding member, and the sliding member drives the cutting saw to move back and forth along the cutting guide rod to guide the cutting saw, so that the cross section of the cut steel pipe is more neat; One end of the support rod is hinged to the cutting guide rod, and the pressure block and the gravity adjustment rod are arranged by threaded cooperation. The position of the pressure block on the gravity adjustment rod can be adjusted as needed. When the pressure block is away from the support rod, the force applied by the pressure block to the cutting saw increases, which facilitates cutting. When the pressure block is close to the support rod, the force applied by the pressure block to the cutting saw decreases, which facilitates taking the cutting saw out of the incision. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A three-dimensional diagram of a steel pipe cutting device according to the present invention; Figure 2 It is a front view of the clamping platform and the reciprocating cutting device of the present invention; Figure 3 For the present invention Figure 2 A partial enlarged view of Figure 4 It is a three-dimensional diagram of the feeding mechanism of the present invention; Figure 5 A three-dimensional diagram of the flip rod of the present invention; Figure 6 It is a three-dimensional diagram of the grabbing mechanism of the present invention.

[0018] 1-grabbing mechanism, 2-feeding mechanism, 21-feeding frame, 22-feeding rod, 23-horizontal feeding rod, 231-blocking block, 24-discharging rod, 241-discharging blocking block, 25-propelling mechanism, 251-propelling plate, 252-flipping rod, 2521-connecting part, 2522-first bending part, 2523-second bending part, 2524-installing part, 253-driving device, 254-conveying transmission wheel, 255-conveyor belt, 3-clamping platform, 4-reciprocating cutting device, 41-cutting guide rod, 42-cutting saw, 43-pressing block, 44-sliding member, 45-gravity adjusting rod, 451-adjusting seat, 46-support rod, 47-first cylinder, 48-power device, 49-power transmission device, 491-first hinged rod, 492-second hinged rod, 493-rotating wheel. DETAILED DESCRIPTION

[0019] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] like Figure 1-6 As shown, a steel pipe cutting device includes a grasping mechanism 1, a feeding mechanism 2, and a clamping platform 3. The grasping mechanism 1 grasps the steel pipe on the feeding mechanism 2 and places it on the clamping platform 3. The clamping platform 3 is provided with a reciprocating cutting device 4. The reciprocating cutting device 4 includes a cutting guide rod 41, a cutting saw 42 and a pressing block 43. The cutting saw 42 makes a reciprocating motion along the cutting guide rod 41. The pressing block 43 is arranged on the cutting guide rod 41. The pressing block 43 applies pressure to the cutting saw 42 toward the steel pipe, so that the cutting saw 42 cuts the steel pipe. The steel pipe is transported by the feeding mechanism 2, which avoids the steel pipe from colliding during the transportation process, resulting in the destruction of the coating layer or spray layer on the surface of the steel pipe. The reciprocating cutting device 4 cuts the steel pipe by the cutting saw 42 moving back and forth along the cutting guide rod 41. During the cutting process of the steel pipe by the cutting saw 42, the pressure block 43 continuously applies pressure to the steel pipe to facilitate cutting, while avoiding the movement of the cutting saw 42 during the cutting process, resulting in a decrease in cutting accuracy. The cutting process is slow, which avoids the high temperature during the cutting process from damaging the coating layer or spray layer on the surface of the steel pipe, and further protects the coating layer and spray layer on the surface of the steel pipe. During the cutting process of the cutting saw 42, the cutting guide rod 41 is used for cutting guidance, and the end face of the cut steel pipe is smoother.

[0021] Reciprocating cutting device 4, such as Figure 1-3As shown, it also includes a sliding member 44, which is slidably arranged on the cutting guide rod 41, and the cutting saw 42 is fixedly connected to the sliding member 44. The sliding member 44 is slidably arranged on the cutting guide rod 41, and the cutting saw 42 is fixedly connected to the sliding member 44. The sliding member 44 drives the cutting saw 42 to move back and forth along the cutting guide rod 41, guides the cutting saw 42, and the cross section of the cut steel pipe is more neat.

[0022] The sliding member 44 includes a first plate 441, a second plate 442 and a plurality of connecting rods 443. The first plate 441 is arranged on one side of the cutting guide rod 41, the second plate 442 is arranged on the other side of the cutting guide rod 41, and the connecting rod 443 is arranged between the first plate 441 and the second plate 442. The sliding member 44 has various forms. A sliding member 44 is provided in which a plurality of connecting rods 443 are connected by the second plate 442 between the first plate 441. The advantage of the sliding member 44 is that it is easy to replace and repair. Once the connecting rod 443 is worn, it can be replaced, saving the repair cost. In order to reduce the friction between the connecting rod 443 and the cutting guide rod 41, a sleeve 4431 is sleeved on the connecting rod 443 to convert the sliding friction into rolling friction, thereby reducing the friction between the connecting rod 443 and the cutting guide rod 41 and extending the service life.

[0023] The reciprocating cutting device 4 further comprises a gravity adjustment rod 45 and a support rod 46, one end of the support rod 46 is hinged to the cutting guide rod 41, the gravity adjustment rod 45 is arranged along the cutting guide rod 41, and the gravity adjustment rod 45 is arranged in threaded cooperation with the pressing block 43. One end of the support rod 46 is hinged to the cutting guide rod 41, the pressing block 43 is arranged in threaded cooperation with the gravity adjustment rod 45, and the position of the pressing block 43 on the gravity adjustment rod 45 can be adjusted as needed. When the pressing block 43 is away from the support rod 46, the force applied by the pressing block 43 to the cutting saw 42 increases, which is convenient for cutting. When the pressing block 43 is close to the support rod 46, the force applied by the pressing block 43 to the cutting saw 42 decreases, which is convenient for taking the cutting saw 42 out of the incision.

[0024] Adjustment seats 451 are provided between both ends of the gravity adjustment rod 45 and the cutting guide rod 41, and the sliding member 44 is provided between the two adjustment seats 451. The two adjustment seats 451 support and fix the two ends of the gravity adjustment rod 45, and the entire gravity adjustment rod 45 is more stable.

[0025] The reciprocating cutting device 4 further comprises a first cylinder 47 , which is hinged to one end of the cutting guide rod 41 away from the support rod 46 . The first cylinder 47 can apply greater pressure to the cutting guide rod 41 , making it easier for the cutting saw 42 to perform cutting.

[0026] The reciprocating cutting device 4 also includes a power device 48 and a power transmission device 49, wherein the power transmission device 49 includes a first hinge rod 491, a second hinge rod 492 and a rotating wheel 493, wherein one end of the first hinge rod 491 is hinged to the cutting saw 42, and the other end of the first hinge rod 491 is hinged to the second hinge rod 492, the output end of the power device 48 is connected to the rotating wheel 493, and one end of the second hinge rod 492 away from the first hinge rod 491 is hinged to the rotating wheel 493, and the first hinge rod 491 is away from the center of the rotating wheel 493. Since the first hinge rod 491 is hinged at an eccentric position of the rotating wheel 493, when the power device 48 drives the rotating wheel 493 to rotate, the first hinge rod 491 and the second hinge rod 492 drive the cutting saw 42 to perform swing cutting.

[0027] Feeding mechanism 2, such as Figure 1 , 4 As shown in 5, it includes a feeding frame 21, a feeding rod 22, a horizontal feeding rod 23, a discharging rod 24 and a propulsion mechanism 25. The feeding rod 22, the horizontal feeding rod 23, the discharging rod 24 and the propulsion mechanism 25 are all arranged on the feeding frame 21, and the propulsion mechanism 25 is arranged in cooperation with the horizontal feeding rod 23.

[0028] The horizontal feeding rods 23 are two parallel rods, and each horizontal feeding rod 23 is evenly provided with a plurality of blocking blocks 231. The two feeding rods 23 can stably support the steel pipes, and the blocking blocks 231 separate the adjacent steel pipes to prevent the adjacent steel pipes from colliding.

[0029] The propulsion mechanism 25 includes two propulsion plates 251 arranged in parallel with each other and two flipping rods 252 located in the same plane, wherein the flipping rod 252 passes through the two propulsion plates 251, one end of which is rotatably arranged on one of the propulsion plates 251, and the other end of which is rotatably arranged on the other propulsion plate 251. Each time the flipping rod 252 flips, it drives the propulsion plate 251 to transport the steel pipe forward, thereby realizing the feeding function of the steel pipe.

[0030] The flip rod 252 includes a connecting portion 2521, a first bending portion 2522, a second bending portion 2523 and a mounting portion 2524. The first bending portion 2522 is arranged at both ends of the connecting portion 2521, the second bending portion 2523 is arranged at the end of the first bending portion 2522, and the second bending portion 2523 is connected to the mounting portion 2524. The connecting portion 2521 is perpendicular to the first bending portion 2522, the first bending portion 2522 is perpendicular to the second bending portion 2523, and the connecting portion 2521, the first bending portion 2522, the second bending portion 2523 and the mounting portion 2524 are arranged in the same plane.

[0031] The propulsion mechanism 25 further includes a driving device 253, a conveying transmission wheel 254 and a conveyor belt 255. The conveying transmission wheel 254 is arranged on the mounting portion 2524, and the conveyor belt 255 is wound between the driving device 253 and the conveying transmission wheel 254. The driving device 253 transmits power to the conveying transmission wheel 254 through the conveyor belt 255, and the conveying transmission wheel 254 transmits the flipping power to the flipping rod 252 through the mounting portion 2524, thereby realizing automatic transportation of the steel pipe.

[0032] One end of the feed rod 22 is connected to one end of the horizontal feed rod 23, and the other end of the feed rod 22 is higher than the horizontal feed rod 23. One end of the discharging rod 24 is connected to the other end of the horizontal feed rod 23, and the other end of the discharging rod 24 is provided with a discharging stopper 241. The end of the feed rod 22 away from the horizontal feed rod 23 is higher than the horizontal feed rod 23. After the steel pipe is placed on the feed rod 22, it slides to the horizontal feed rod 23 due to gravity; the other end of the discharging rod 24 is provided with a discharging stopper 241, which is used to block the steel pipe and prevent it from falling off the discharging rod 24. In a preferred embodiment, the end of the discharging rod 24 away from the horizontal feed rod 23 is lower than the horizontal feed rod 23, and the steel pipe pushed to the discharging rod 24 by the propulsion mechanism 25 reaches the position of the discharging stopper 241 under the action of gravity, which is convenient for the grasping mechanism 1 to grasp accurately.

[0033] Grasping mechanism 1, such as Figure 1 and 6 As shown, it includes a grabbing frame 11, a vertical rod 13, a transverse rod 14, a sliding plate 15 and a clamping claw 16. The vertical rod 13 is rotatably arranged on the grabbing frame 11, the transverse rod 14 is slidably arranged along the length direction of the vertical rod 13, the sliding plate 15 is slidably arranged along the length direction of the transverse rod 14, and the clamping claw 15 is arranged on the sliding plate 15. The grabbing mechanism also includes a first grabbing motor 12, a first lifting motor 17 and a first moving cylinder 18. The first grabbing motor 12 is arranged on the grabbing frame 11. The output end of the first grabbing motor 12 is connected to the first transmission gear 121 in a transmission manner. The vertical rod 13 is connected to the second transmission gear 131. The first transmission gear 121 is meshed with the second transmission gear 131. The first lifting motor 17 drives the transverse rod 14 to make a reciprocating motion along the vertical rod 13. The first moving cylinder 18 is arranged between the transverse rod 14 and the sliding plate 15. The first moving cylinder 18 drives the sliding plate 15 to make a reciprocating motion along the transverse rod 14. The first grabbing motor 12 drives the vertical rod 13 to rotate through the first transmission gear 121 and the second transmission gear 131, so as to clamp the steel pipe on the material rod 24 and then place the steel pipe to the target position. The first moving cylinder 18 adjusts the position of the sliding plate 15 on the transverse rod 14. Through the adjustment, the grabbing position and the placing position can be adjusted, so that the accuracy of clamping and placing the steel pipe is improved.

[0034] In order to improve the stability of clamping, the clamping jaws 16 can be multiple. In this embodiment, two clamping jaws 16 are taken as an example. The clamping jaws 16 include a main clamping plate 167, a first clamping rod 161, a second clamping rod 162, a clamping cylinder 163, a first clamping transmission rod 164, a second clamping transmission rod 165 and a clamping power rod 166. One end of the first clamping rod 161 and the second clamping rod 162 are hinged on the main clamping plate 167, one end of the first clamping transmission rod 164 is hinged to the second clamping rod 162, and the other end of the first clamping transmission rod 164 is hinged to the clamping power rod 166, one end of the second clamping transmission rod 165 is hinged to the first clamping rod 161, and the other end of the first clamping transmission rod 164 is hinged to the clamping power rod 166, and the power output end of the clamping cylinder 163 is connected to the clamping power rod 166.

[0035] The clamping platform 3 includes a clamping bracket 31, a clamping guide plate 32, a fixed clamping block 33, a movable clamping block 34, a clamping transmission rod 35, a clamping motor 36 and a clamping limit plate 37. The clamping guide plate 32 and the clamping limit plate 37 are arranged on the clamping bracket 31, the clamping limit plate 37 is arranged at one end of the clamping guide plate 32, the fixed clamping block 33 is fixedly arranged at one end of the clamping guide plate 32 away from the clamping limit plate 37, the movable clamping block 34 is slidably arranged on the clamping guide plate 32, the clamping motor 36 is fixedly arranged on the clamping limit plate 37, and the clamping transmission rod 35 is arranged between the clamping motor 36 and the movable clamping block 34.

[0036] The above description is only a preferred embodiment of the present invention and is 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 steel pipe cutting device, comprising a gripping mechanism (1), characterized in that: The invention also comprises a feeding mechanism (2) and a clamping platform (3). The grabbing mechanism (1) grabs the steel pipe on the feeding mechanism (2) and places it on the clamping platform (3). The clamping platform (3) is provided with a reciprocating cutting device (4). The reciprocating cutting device (4) comprises a cutting guide rod (41), a cutting saw (42) and a pressing block (43). The cutting saw (42) performs a reciprocating motion along the cutting guide rod (41). The pressing block (43) is provided on the cutting guide rod (41). The pressing block (43) applies pressure to the cutting saw (42) toward the steel pipe.

2. A steel pipe cutting device as claimed in claim 1, characterized in that: The reciprocating cutting device (4) further comprises a sliding member (44), wherein the sliding member (44) is slidably arranged on the cutting guide rod (41), and the cutting saw (42) is fixedly connected to the sliding member (44).

3. A steel pipe cutting device as claimed in claim 2, characterized in that: The reciprocating cutting device (4) further comprises a gravity adjustment rod (45), wherein the gravity adjustment rod (45) is arranged along the length direction of the cutting guide rod (41), and the gravity adjustment rod (45) is threadedly matched with the pressing block (43).

4. A steel pipe cutting device as claimed in claim 3, characterized in that: Adjustment seats (451) are provided between both ends of the gravity adjustment rod (45) and the cutting guide rod (41), and the sliding member (44) is provided between the two adjustment seats (451).

5. A steel pipe cutting device as claimed in claim 1, characterized in that: The reciprocating cutting device (4) further comprises a support rod (46) and a first cylinder (47), one end of the support rod (46) being hinged to the cutting guide rod (41), and the other end of the first cylinder (47) being hinged to the cutting guide rod (41).

6. A steel pipe cutting device as claimed in claim 1, characterized in that: The reciprocating cutting device (4) further comprises a power device (48) and a power transmission device (49), wherein the power transmission device (49) comprises a first hinged rod (491), a second hinged rod (492) and a rotating wheel (493), wherein one end of the first hinged rod (491) is hinged to the cutting saw (42), and the other end of the first hinged rod (491) is hinged to the second hinged rod (492), an output end of the power device (48) is connected to the rotating wheel (493) in a transmission manner, an end of the second hinged rod (492) away from the first hinged rod (491) is hinged to the rotating wheel (493), and the first hinged rod (491) is away from the center of the rotating wheel (493).

7. A steel pipe cutting device as claimed in claim 1, characterized in that: The feeding mechanism (2) comprises a feeding frame (21), a feeding rod (22), a horizontal feeding rod (23), a discharging rod (24) and a propulsion mechanism (25); the feeding rod (22), the horizontal feeding rod (23), the discharging rod (24) and the propulsion mechanism (25) are all arranged on the feeding frame (21); the propulsion mechanism (25) is arranged in cooperation with the horizontal feeding rod (23); the horizontal feeding rods (23) are two parallel-arranged rods, and each horizontal feeding rod (23) is evenly provided with a plurality of stop blocks (231); one end of the feeding rod (22) is connected to one end of the horizontal feeding rod (23), the other end of the feeding rod (22) is higher than the horizontal feeding rod (23), one end of the discharging rod (24) is connected to the other end of the horizontal feeding rod (23), and the other end of the discharging rod (24) is provided with a discharging stop block (241).

8. A steel pipe cutting device as claimed in claim 7, characterized in that: The propulsion mechanism (25) comprises two propulsion plates (251) arranged parallel to each other and two flip rods (252) located in the same plane. The flip rod (252) passes through the two propulsion plates (251), one end of which is rotatably arranged on one of the propulsion plates (251), and the other end of which is rotatably arranged on the other propulsion plate (251).

9. A steel pipe cutting device as claimed in claim 8, characterized in that: The flip rod (252) comprises a connecting portion (2521), a first bending portion (2522), a second bending portion (2523) and a mounting portion (2524); the first bending portion (2522) is arranged at both ends of the connecting portion (2521); the second bending portion (2523) is arranged at the end of the first bending portion (2522); the second bending portion (2523) is connected to the mounting portion (2524); the connecting portion (2521) is arranged perpendicularly to the first bending portion (2522); the first bending portion (2522) is arranged perpendicularly to the second bending portion (2523); and the connecting portion (2521), the first bending portion (2522), the second bending portion (2523) and the mounting portion (2524) are arranged in the same plane.

10. A steel pipe cutting device as claimed in claim 9, characterized in that: The propulsion mechanism (25) further comprises a driving device (253), a conveying transmission wheel (254) and a conveyor belt (255); the conveying transmission wheel (254) is arranged on the mounting portion (2524); and the conveyor belt (255) is wound between the driving device (253) and the conveying transmission wheel (254).

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