A cutting device for oil and gas transmission pipes

Abstract

The present invention discloses a petroleum and natural gas transportation pipe cutting device, which belongs to the field of pipe processing technology and includes a base plate. A fixing component, a supporting component, a positioning component and an auxiliary component are arranged on the base plate. The supporting component can adjust the positions of two semicircular supporting plates, so that the conveying pipe can be given way in the process of placing the conveying pipe on the supporting long rod. Through the mutual cooperation of the fixing component and the supporting component, the positions of four supporting long rods can be adjusted, so that the conveying pipe can be supported and fixed from the inner side of the conveying pipe. The positioning component can independently adjust the positions of the positioning ring plate and the semicircular positioning ring plate, so as to adjust the position of the conveying pipe on the supporting long rod, that is, to adjust the cutting position of the conveying pipe. By arranging a giving way notch on the supporting long rod, the saw blade can be prevented from contacting the surface of the supporting long rod when the saw blade moves to the contact position between the supporting long rod and the conveying pipe.

Description

Technical Field

[0001] The invention relates to the technical field of pipe processing, in particular to a petroleum and natural gas transmission pipe cutting device. Background Art

[0002] Oil and gas transmission pipes usually have a large diameter and wall thickness. Manual cutting is time-consuming, labor-intensive and inefficient. There are certain safety risks in manual cutting of oil and gas transmission pipes, especially when operating large-diameter and thick-walled pipes. In addition, the cutting quality of oil and gas transmission pipes directly affects the quality and sealing of pipeline connections. Therefore, the cutting speed is greatly improved by an automated cutting device, and the accuracy and consistency of cutting can be ensured. However, the existing cutting device can only fix the transmission pipe from the outside. The transmission pipe is easily deformed inwardly under the action of the fixing device, and the transmission pipe is also easily deformed during the cutting process due to the force of the saw blade on the transmission pipe. Therefore, the present invention provides an oil and gas transmission pipe cutting device. Summary of the invention

[0003] In view of the defects in the prior art, the present invention provides a petroleum and natural gas transportation pipe cutting device, which overcomes the problem that the transportation pipe can only be fixed from the outside, causing the transportation pipe to deform inward, and the transportation pipe is also easily deformed during the cutting process due to the force exerted by the saw blade on the transportation pipe.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a petroleum and natural gas pipeline cutting device, comprising a base plate, a fixing component, a supporting component and a positioning component are arranged on the base plate, the fixing component comprises a supporting circular plate and four supporting long rods, the supporting long rods are used to realize the support and fixation of the pipeline, both ends of the supporting long rods are fixedly provided with strip sliders, the supporting circular plate and the corresponding four strip sliders are slidably matched, an expansion unit is arranged between the four supporting long rods, the supporting component comprises a semicircular supporting plate symmetrically slidably mounted on the base plate, and the two semicircular supporting plates are slidably matched with the corresponding four strip sliders when engaged, the positioning component comprises a positioning ring plate and two semicircular positioning ring plates, the positioning ring plate and the semicircular positioning ring plates are both provided with a positioning push plate, the positioning push plate is used to realize the adjustment of the position of the pipeline on the supporting long rod, an auxiliary component is arranged on the base plate, the auxiliary component comprises an auxiliary slide and two side slides, a saw blade is rotatably mounted on the auxiliary slide, and a pressing roller is rotatably mounted on the side slide, and the pressing roller is used to realize the auxiliary fixation of the pipeline.

[0005] Furthermore, the supporting circular plate is fixedly mounted on the base plate, a limiting slide is symmetrically slidably mounted on the base plate, an annular limiting plate is fixedly mounted on the limiting slide closest to the supporting circular plate, four limiting ratchets are fixedly arranged on the annular limiting plate, two ratchets are fixedly arranged on the strip sliding block, and the limiting ratchets on the annular limiting plate and the ratchets on the corresponding strip sliding block constitute a ratchet mechanism.

[0006] Furthermore, the unfolding unit includes a double-headed threaded screw and two unfolding slides. The double-headed threaded screw is rotatably mounted on a supporting circular plate. The two unfolding slides respectively form a spiral pair with the threads at both ends of the double-headed threaded screw. A strip unfolding plate is arranged between the unfolding slide and the supporting long rod. The two ends of the strip unfolding plate are respectively rotatably connected to the unfolding slide and the corresponding supporting long rod.

[0007] Furthermore, four supporting long rods are arranged in a circular array relative to the axis of the double-threaded screw rod 1, and a clearance gap is arranged in the middle position of the supporting long rod.

[0008] Furthermore, a semicircular limiting ring plate is slidably installed on the semicircular support plates, and when the two semicircular limiting ring plates are engaged, an annular limiting plate is formed. The semicircular limiting ring plates are slidably matched with the limiting slide plates closest to the semicircular support plates. Two limiting ratchet bars are provided on the semicircular limiting ring plates, and a ratchet mechanism is formed when the limiting ratchet bars on the semicircular limiting ring plates are engaged with the ratchets on the corresponding strip sliders.

[0009] Furthermore, a positioning slide plate is symmetrically slidably installed on the bottom plate, the positioning ring plate is fixedly connected to the positioning slide plate closest to the positioning ring plate, and two semicircular positioning ring plates are symmetrically slidably installed on the positioning slide plate closest to the semicircular support plate, and the semicircular positioning ring plates and the corresponding semicircular support plates are slidably matched.

[0010] Furthermore, four positioning push plates are fixedly arranged in a circular array on the semicircular positioning ring plate, and two positioning push plates are symmetrically fixedly arranged on the semicircular positioning ring plate. When the two semicircular positioning ring plates are joined, one positioning ring plate is formed.

[0011] Furthermore, the auxiliary component also includes an annular support seat, on which an auxiliary gear ring is rotatably mounted, an auxiliary slide seat is slidably mounted on the auxiliary gear ring, two side slide seats are respectively slidably mounted on both sides of the auxiliary slide seat, and springs are arranged between the side slide seat and the auxiliary slide seat.

[0012] Furthermore, when the spring between the side slide seat and the auxiliary slide seat is not compressed, the distance between the lower end of the pressing roller and the lower surface of the bottom plate is smaller than the distance between the lower end of the saw blade and the lower surface of the bottom plate.

[0013] Compared with the prior art, the present invention has the following beneficial effects: (1) By providing a support assembly, the present invention can adjust the positions of the two semicircular support plates, thereby making way for the conveying pipe to be placed on the supporting long rod. (2) By cooperating with the fixing assembly and the supporting assembly, the present invention can adjust the positions of the four supporting long rods, thereby supporting and fixing the conveying pipe from the inner side of the conveying pipe, and can also limit the position of the supporting long rod, thereby improving the stability of the conveying pipe when it is fixed. (3) By providing a positioning assembly, the present invention can independently adjust the positions of the positioning ring plate and the semicircular positioning ring plate, thereby adjusting the position of the conveying pipe on the supporting long rod, that is, adjusting the cutting position of the conveying pipe. (4) By providing a making way notch on the supporting long rod, the present invention can prevent the saw blade from contacting the surface of the supporting long rod when the saw blade moves to the contact position between the supporting long rod and the conveying pipe, thereby avoiding damage to the saw blade and the supporting long rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0015] Figure 2 It is a schematic structural diagram of the fixing assembly of the present invention.

[0016] Figure 3 It is a front view of the fixing assembly of the present invention.

[0017] Figure 4 It is a structural schematic diagram of the gap of the present invention.

[0018] Figure 5 for Figure 4 A local enlarged schematic diagram of point A in the middle.

[0019] Figure 6 for Figure 4 A local enlarged schematic diagram of point B in the middle.

[0020] Figure 7 It is a schematic structural diagram of the support assembly of the present invention.

[0021] Figure 8 It is a structural schematic diagram of the semicircular adjustment ring plate of the present invention.

[0022] Fig. 9 It is a front view of the support assembly of the present invention.

[0023] Fig.10 It is a structural schematic diagram of the auxiliary slide seat of the present invention.

[0024] Fig.11 It is a front view of the auxiliary slide structure of the present invention.

[0025] Figure numerals: 101-bottom plate; 102-annular support seat; 103-auxiliary gear ring; 104-auxiliary gear; 105-semicircular support plate; 106-support circular plate; 107-double-threaded screw rod 1; 108-support long rod; 109-positioning ring plate; 110-positioning screw rod; 111-positioning motor; 112-auxiliary motor; 113-gap; 114-side sliding seat; 115-pressing roller; 116-saw blade; 117-cutting motor; 118-auxiliary sliding seat; 11 9-feed screw; 120-strip slider; 121-unfolding slide; 122-strip unfolding plate; 123-ratchet; 124-feed motor; 125-limit motor; 126-double-headed threaded screw 2; 127-limit slide plate; 128-adjusting slide plate; 129-annular limit plate; 130-limit ratchet; 131-giving motor; 132-unfolding motor; 133-double-headed threaded screw 3; 134-semicircular limit ring plate; 135-semicircular adjusting ring plate; 136-adjusting push plate. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0027] Example: Reference Figure 1-Figure 11 A petroleum and natural gas pipeline cutting device includes a base plate 101, a fixing assembly is arranged on the base plate 101, the fixing assembly includes a supporting circular plate 106 and four supporting long rods 108, the supporting long rods 108 are used to realize the support and fixation of the pipeline, the supporting circular plate 106 is fixedly installed on the base plate 101, both ends of the supporting long rods 108 are fixedly provided with strip sliders 120, the supporting circular plate 106 and the corresponding four strip sliders 120 are slidably matched, the four strip sliders 120 on the supporting circular plate 106 are arranged in a circular array relative to the axis of the supporting circular plate 106, the base plate 101 is symmetrically slidably installed with a limited slide plate 127, the base plate 101 A double-headed threaded screw 126 is rotatably installed on the upper surface, and two limiting slide plates 127 respectively form a spiral pair with the threads at both ends of the double-headed threaded screw 126. A limiting motor 125 is fixedly installed on the bottom plate 101, and the output shaft of the limiting motor 125 is fixedly connected to the double-headed threaded screw 126. An annular limiting plate 129 is fixedly installed on the limiting slide plate 127 closest to the supporting circular plate 106, and four limiting ratchet strips 130 are fixedly provided on the annular limiting plate 129. Two ratchets 123 are fixedly provided on the strip slider 120. The limiting ratchet strips 130 on the annular limiting plate 129 and the ratchets 123 on the corresponding strip slider 120 form a ratchet mechanism.

[0028] An unfolding unit is arranged between the four supporting long rods 108, and the unfolding unit includes a double-headed threaded screw 107 and two unfolding slides 121. The double-headed threaded screw 107 is rotatably mounted on the supporting circular plate 106, and an unfolding motor 132 is fixedly mounted on the supporting circular plate 106. The output shaft of the unfolding motor 132 is fixedly connected to the double-headed threaded screw 107. The four supporting long rods 108 are arranged in a circular array relative to the axis of the double-headed threaded screw 107. The two unfolding slides 121 respectively form a spiral pair with the threads at both ends of the double-headed threaded screw 107. A strip unfolding plate 122 is arranged between the unfolding slide 121 and the supporting long rods 108. The two ends of the strip unfolding plate 122 are respectively rotatably connected to the unfolding slide 121 and the corresponding supporting long rods 108, and a clearance gap 113 is arranged in the middle position of the supporting long rod 108.

[0029] In the initial position, the annular limit plate 129 is located at the position closest to the supporting circular plate 106. At this time, the limit ratchet strips 130 on the annular limit plate 129 are in engagement with the ratchet teeth 123 on the corresponding strip slider 120, and the two unfolding slides 121 are located at the farthest positions. Under the action of the strip unfolding plate 122, the four supporting long rods 108 are located at the position closest to the axis of the double-headed threaded screw 107.

[0030] Start the unfolding motor 132 to drive the double-headed threaded screw 107 to rotate, so that the two unfolding slides 121 move towards each other, and then under the action of the strip unfolding plate 122, the four supporting long rods 108 move in the direction away from the axis of the double-headed threaded screw 107. At this time, the strip slider 120 that slides with the supporting circular plate 106 moves in the direction away from the axis of the double-headed threaded screw 107 relative to the limiting ratchet 130 on the annular limiting plate 129. Under the action of the limiting ratchet 130 and the ratchet 123 on the strip slider 120, the strip slider 120 that slides with the supporting circular plate 106 cannot move in the direction close to the axis of the double-headed threaded screw 107 relative to the limiting ratchet 130 on the annular limiting plate 129.

[0031] Start the limit motor 125 to drive the double-headed threaded screw 126 to rotate, so that the two limit slides 127 move away from each other, and the annular limit plate 129 moves away from the supporting circular plate 106. The four limit ratchet strips 130 on the annular limit plate 129 move synchronously, and finally the limit ratchet strips 130 on the annular limit plate 129 disengage from the ratchet teeth 123 on the strip slider 120 on the supporting circular plate 106, that is, the limit ratchet strips 130 release the restriction on the position of the strip slider 120. At this time, the strip slider 120 on the supporting circular plate 106 can move in the direction close to the axis of the double-headed threaded screw 107 under the action of the double-headed threaded screw 107.

[0032] A support assembly is provided on the base plate 101, and the support assembly includes a semicircular support plate 105 symmetrically slidably mounted on the base plate 101, and a circular plate is formed when two semicircular support plates 105 are joined, and the axes of the circular plate formed when the two semicircular support plates 105 are joined and the supporting circular plate 106 are on the same straight line, a double-headed threaded screw rod 3 133 is rotatably mounted on the base plate 101, and a yielding motor 131 is fixedly mounted on the base plate 101, and the output shaft of the yielding motor 131 is fixedly connected to the double-headed threaded screw rod 3 133, and the two semicircular support plates 105 respectively form a spiral pair with the threads at both ends of the double-headed threaded screw rod 3 133, and when the two semicircular support plates 105 are joined, they slide with the corresponding four strip sliders 120.

[0033] The semicircular support plates 105 are all slidably installed with semicircular limiting ring plates 134. When two semicircular limiting ring plates 134 are engaged, an annular limiting plate 129 is formed. The semicircular limiting ring plates 134 are slidably matched with the limiting slide plate 127 closest to the semicircular support plates 105. Two limiting ratchet bars 130 are arranged on the semicircular limiting ring plates 134. When the limiting ratchet bars 130 on the semicircular limiting ring plates 134 are engaged with the ratchet teeth 123 on the corresponding strip slider 120, a ratchet mechanism is formed.

[0034] In the initial position, the two semicircular support plates 105 are located at the farthest position, that is, the two semicircular limiting ring plates 134 are also located at the farthest position, and the semicircular limiting ring plate 134 is located at the closest position to the corresponding semicircular support plate 105.

[0035] The starting yielding motor 131 drives the double-headed threaded screw 3 133 to rotate, so that the two semicircular support plates 105 move in the direction of approaching each other, and the semicircular limiting ring plate 134 that slides with the semicircular support plate 105 moves synchronously, and finally the end faces of the two semicircular support plates 105 are engaged, and the end faces of the two semicircular limiting ring plates 134 are also engaged. Since the limiting ratchet 130 and the ratchet teeth 123 on the strip slider 120 constitute a ratchet mechanism, the limiting ratchet 130 on the semicircular limiting ring plate 134 moves relative to the corresponding strip slider 120 during the process of the two semicircular limiting ring plates 134 moving in the direction of approaching each other, and when the two semicircular support plates 105 are engaged, the four strip sliders 120 closest to the semicircular support plate 105 are slidably installed in a circular array on the circular plate formed by the two semicircular support plates 105.

[0036] A positioning assembly is provided on the base plate 101, and the positioning assembly includes a positioning ring plate 109 and two semicircular positioning ring plates 135. A positioning slide plate 128 is symmetrically slidably installed on the base plate 101. Two positioning screw rods 110 are rotatably installed on the base plate 101. Two positioning motors 111 are fixedly installed on the base plate 101. The output shafts of the two positioning motors 111 are respectively fixedly connected to the corresponding positioning screw rods 110. The positioning slide plates 128 respectively form a spiral pair with the corresponding positioning screw rods 110. The positioning ring plate 109 is fixedly connected to the positioning slide plate 128 closest to the positioning ring plate 109. The two semicircular positioning ring plates 135 are symmetrically slidably installed on the positioning slide plate 128 closest to the semicircular support plate 105. The semicircular positioning ring plate 135 and the corresponding semicircular support plate 105 are slidably matched.

[0037] Both the positioning ring plate 109 and the semicircular positioning ring plate 135 are provided with positioning push plates 136, which are used to adjust the position of the conveying pipe on the supporting long rod 108. Four positioning push plates 136 are fixedly provided in a circular array on the semicircular positioning ring plate 135, and two positioning push plates 136 are symmetrically fixedly provided on the semicircular positioning ring plate 135. When the two semicircular positioning ring plates 135 are joined, one positioning ring plate 109 is formed. When the two semicircular support plates 105 are located at the farthest position, the two semicircular positioning ring plates 135 are also located at the farthest position.

[0038] Start the two positioning motors 111 to drive the corresponding positioning screw rods 110 to rotate, so that the two positioning slide plates 128 slide relative to the base plate 101, the positioning ring plate 109 slides relative to the supporting circular plate 106, and the semicircular positioning ring plate 135 slides relative to the semicircular supporting plate 105.

[0039] An auxiliary component is also provided on the base plate 101, and the auxiliary component includes an auxiliary slide 118 and two side slides 114. A saw blade 116 is rotatably mounted on the auxiliary slide 118, a cutting motor 117 is fixedly mounted on the auxiliary slide 118, and the output shaft of the cutting motor 117 is fixedly connected to the saw blade 116. The two side slides 114 are respectively slidably mounted on both sides of the auxiliary slide 118, and springs are provided between the side slides 114 and the auxiliary slides 118. A pressing roller 115 is rotatably mounted on the side slides 114, and the pressing roller 115 is used to achieve auxiliary fixation of the conveying pipe.

[0040] An annular support seat 102 is fixedly mounted on the bottom plate 101, and an auxiliary gear ring 103 and an auxiliary gear 104 are rotatably mounted on the annular support seat 102. The axes of the auxiliary gear ring 103 and the supporting circular plate 106 are in the same straight line. The auxiliary gear ring 103 and the auxiliary gear 104 form a gear pair. An auxiliary motor 112 is fixedly mounted on the side of the annular support seat 102. The output shaft of the auxiliary motor 112 is fixedly connected to the auxiliary gear 104. The auxiliary slide seat 118 is slidably mounted on the auxiliary gear ring 10 3, a feed motor 124 is fixedly mounted on the auxiliary slide 118, a feed screw 119 is rotatably mounted on the auxiliary slide 118, an output shaft of the feed motor 124 is fixedly connected to the feed screw 119, the feed screw 119 and the auxiliary gear ring 103 form a spiral pair, when the spring between the side slide 114 and the auxiliary slide 118 is not compressed, the distance between the lower end of the pressing roller 115 and the lower surface of the bottom plate 101 is smaller than the distance between the lower end of the saw blade 116 and the lower surface of the bottom plate 101.

[0041] Working principle: In the initial position, the two semicircular support plates 105 are located at the farthest position from each other, and the four supporting long rods 108 are located at the position closest to the axis of the double-headed threaded screw 107, that is, at this time, the end of the supporting long rod 108 farthest from the supporting circular plate 106 is not blocked, and the oil and gas transmission pipe to be cut is placed on the supporting long rod 108 from the unblocked end of the supporting long rod 108. The supporting long rod 108 is located on the inner side of the transmission pipe, and the distance between the end face of the transmission pipe farthest from the supporting circular plate 106 and the supporting circular plate 106 is smaller than the distance between the end face of the semicircular adjusting ring plate 135 closest to the supporting circular plate 106 and the supporting circular plate 106, that is, the transmission pipe is located between the positioning ring plate 109 and the semicircular adjusting ring plate 135.

[0042] Then, the yielding motor 131 is started to drive the double-threaded screw rod 133 to rotate, so that the two semicircular support plates 105 are engaged, the two semicircular limiting ring plates 134 are engaged synchronously, and the two semicircular adjusting ring plates 135 are also engaged synchronously. At this time, the limiting ratchet strips 130 on the semicircular limiting ring plates 134 are engaged with the ratchet teeth 123 on the corresponding strip-shaped slider 120 to form a ratchet mechanism, and then the unfolding motor 132 is started to drive the double-threaded screw rod 107 to rotate, that is, the two unfolding slide seats 1 21 move in the direction of approaching each other, thereby making the four supporting long rods 108 move in the direction away from the axis of the double-headed threaded screw 107, and finally making the four supporting long rods 108 contact the inner surface of the conveying pipe. At this time, the four supporting long rods 108 are not completely fixed to the conveying pipe, and the conveying pipe can also slide relative to the supporting long rods 108. During the sliding process of the supporting long rods 108, the ratchet 123 on the strip slider 120 slides relative to the limiting ratchet strip 130.

[0043] Then, two positioning motors 111 are started respectively to drive the corresponding positioning screw rods 110 to rotate, so that the corresponding positioning slide plates 128 slide, and then the positioning ring plate 109 and the semicircular positioning ring plate 135 slide respectively, and the positioning push plate 136 on the positioning ring plate 109 contacts the end face of the conveying pipe, and the positioning ring plate 109 continues to move, so that the conveying pipe slides on the supporting long rod 108. Under the action of the positioning ring plate 109 and the semicircular positioning ring plate 135, the position of the conveying pipe to be cut is moved to directly above the clearance notch 113. At this time, the position of the conveying pipe to be cut is directly below the saw blade 116.

[0044] Restart the unfolding motor 132, so that the four supporting long rods 108 continue to move in the direction away from the axis of the double-headed threaded screw 107, and finally the four supporting long rods 108 can completely fix the conveying pipe. At this time, the axis of the conveying pipe and the axis of the double-headed threaded screw 107 are in the same straight line. Then start the feed motor 124 to drive the feed screw 119 to rotate, so that the auxiliary slide 118 moves in the direction close to the axis of the auxiliary gear ring 103, and the pressing roller 115 and the saw blade 116 move downward synchronously. Since the distance between the lower end of the pressing roller 115 and the lower surface of the base plate 101 is smaller than the distance between the lower end of the saw blade 116 and the lower surface of the base plate 101, the pressing roller 115 contacts the surface of the conveying pipe, and the auxiliary slide 118 continues to move downward. The spring between the auxiliary slide 118 and the side slide 114 is compressed, and finally the saw blade 116 contacts the surface of the conveying pipe.

[0045] The cutting motor 117 is then started to drive the saw blade 116 to rotate. Under the action of the saw blade 116, the conveying pipe is cut. The auxiliary motor 112 is started to drive the auxiliary gear 104 to rotate, so that the auxiliary gear ring 103 rotates relative to the conveying pipe. The pressing roller 115 and the saw blade 116 rotate synchronously, that is, the conveying pipe is cut. In the process of the saw blade 116 rotating around the axis of the auxiliary gear ring 103, the saw blade 116 passes through the clearance notch 113 on the supporting long rod 108, thereby avoiding the saw blade 1 16 contacts the supporting long rod 108, thereby avoiding damage to the supporting long rod 108 and the saw blade 116. During the rotation of the auxiliary tooth ring 103, since the pressing roller 115 is located on both sides of the saw blade 116, the pressing roller 115 assists in pressing and fixing the cutting position of the saw blade 116. Under the action of the limiting ratchet 130 and the ratchet 123 on the strip slider 120, the supporting long rod 108 cannot move in the direction close to the axis of the double-headed threaded screw 107, that is, the position of the supporting long rod 108 is locked.

[0046] After the cutting of the conveying pipe is completed, the limit motor 125 is started to drive the double-headed threaded screw 126 to rotate, so that the two limit slides 127 move away from each other, that is, the annular limit plate 129 moves away from the supporting circular plate 106 and the semicircular limit ring plate 134 moves away from the semicircular supporting plate 105, and finally the limit ratchet strip 130 disengages from the ratchet teeth 123 on the strip slider 120, that is, the lock on the position of the supporting long rod 108 is released, and at this time, the unfolding motor 132 is started to make the two unfolding slides 121 move towards each other, that is, the supporting long rod 108 releases the fixation on the conveying pipe, and then the yielding motor 131 is started to move the two semicircular supporting plates 105 to the farthest position, and the cut conveying pipe can be taken out from the supporting long rod 108.

[0047] The present invention is not limited to the above-mentioned specific implementation modes. Various changes made by technicians in the relevant technical field based on the above-mentioned conception without creative work all fall within the protection scope of the present invention.

Claims

1. A petroleum and natural gas transmission pipe cutting device, comprising a base plate (101), characterized in that: The bottom plate (101) is provided with a fixing component, a supporting component, and a positioning component. The fixing component comprises a supporting circular plate (106) and four supporting long rods (108). The supporting long rods (108) are used to support and fix the conveying pipe. Both ends of the supporting long rods (108) are fixedly provided with strip sliders (120). The supporting circular plate (106) and the corresponding four strip sliders (120) are slidably matched. An unfolding unit is provided between the four supporting long rods (108). The supporting component comprises a support plate (106) and four supporting long rods (108). A semicircular support plate (105) is symmetrically slidably mounted on the bottom plate (101); when the two semicircular support plates (105) are engaged, they are slidably matched with the corresponding four strip-shaped sliders (120); the position adjustment component includes a position adjustment ring plate (109) and two semicircular position adjustment ring plates (135); the position adjustment ring plate (109) and the semicircular position adjustment ring plate (135) are both provided with a position adjustment push plate (136); the position adjustment push plate (136) is used to adjust the position of the conveying pipe on the supporting long rod (108); An auxiliary component is arranged on the bottom plate (101), and the auxiliary component comprises an auxiliary slide seat (118) and two side slide seats (114); a saw blade (116) is rotatably mounted on the auxiliary slide seat (118), and a pressing roller (115) is rotatably mounted on each of the side slide seats (114); the pressing roller (115) is used to achieve auxiliary fixation of the conveying pipe; The supporting circular plate (106) is fixedly mounted on the bottom plate (101); a limiting slide plate (127) is symmetrically slidably mounted on the bottom plate (101); an annular limiting plate (129) is fixedly mounted on the limiting slide plate (127) closest to the supporting circular plate (106); four limiting ratchet strips (130) are fixedly arranged on the annular limiting plate (129); two ratchet teeth (123) are fixedly arranged on each of the strip sliding blocks (120); the limiting ratchet strips (130) on the annular limiting plate (129) and the ratchet teeth (123) on the corresponding strip sliding blocks (120) form a ratchet mechanism; The unfolding unit comprises a double-threaded screw rod (107) and two unfolding slides (121); the double-threaded screw rod (107) is rotatably mounted on a supporting circular plate (106); the two unfolding slides (121) respectively form a spiral pair with the threads at both ends of the double-threaded screw rod (107); a strip-shaped unfolding plate (122) is provided between the unfolding slide (121) and the supporting long rod (108); and the two ends of the strip-shaped unfolding plate (122) are respectively rotatably connected to the unfolding slide (121) and the corresponding supporting long rod (108); The semicircular support plates (105) are each slidably mounted with a semicircular limiting ring plate (134). When two semicircular limiting ring plates (134) are engaged, an annular limiting plate (129) is formed. The semicircular limiting ring plates (134) are slidably matched with a limiting slide plate (127) closest to the semicircular support plates (105). Two limiting ratchet bars (130) are each arranged on the semicircular limiting ring plates (134). When the limiting ratchet bars (130) on the semicircular limiting ring plates (134) are engaged with ratchets (123) on corresponding strip-shaped slide blocks (120), a ratchet mechanism is formed.

2. The oil and gas transmission pipe cutting device according to claim 1, characterized in that: The four supporting long rods (108) are arranged in a circular array relative to the axis of the double-threaded screw rod 1 (107), and a clearance notch (113) is provided at the middle position of the supporting long rod (108).

3. The oil and gas transmission pipe cutting device according to claim 2, characterized in that: The bottom plate (101) is symmetrically slidably mounted with a positioning slide plate (128); the positioning ring plate (109) is fixedly connected to the positioning slide plate (128) closest to the positioning ring plate (109); two semicircular positioning ring plates (135) are symmetrically slidably mounted on the positioning slide plate (128) closest to the semicircular support plate (105); the semicircular positioning ring plates (135) and the corresponding semicircular support plates (105) are slidably matched.

4. The oil and gas transmission pipe cutting device according to claim 3, characterized in that: Four positioning push plates (136) are fixedly arranged in a circular array on the semicircular positioning ring plate (135), two positioning push plates (136) are symmetrically fixedly arranged on the semicircular positioning ring plate (135), and one positioning ring plate (109) is formed when the two semicircular positioning ring plates (135) are joined.

5. The oil and gas transmission pipe cutting device according to claim 4, characterized in that: The auxiliary component further comprises an annular support seat (102), an auxiliary gear ring (103) being rotatably mounted on the annular support seat (102), the auxiliary slide seat (118) being slidably mounted on the auxiliary gear ring (103), the two side slide seats (114) being slidably mounted on both sides of the auxiliary slide seat (118), and a spring being arranged between the side slide seat (114) and the auxiliary slide seat (118).

6. The oil and gas transmission pipe cutting device according to claim 5, characterized in that: When the spring between the side slide seat (114) and the auxiliary slide seat (118) is not compressed, the distance between the lower end of the pressing roller (115) and the lower surface of the bottom plate (101) is smaller than the distance between the lower end of the saw blade (116) and the lower surface of the bottom plate (101).

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