A drill pipe cutting device

Abstract

The present invention discloses a drill pipe cutting device, which comprises a frame. A slope and a laser cutting assembly are arranged on the frame. A rotating assembly is also arranged on the frame. The rotating assembly includes three rollers, one of which is a bottom roller protruding from the surface of the slope, and the other two are a clamping roller and a blocking roller respectively. A driving assembly is connected to drive the two rollers to move cyclically in sequence between a material blocking position, a material clamping position and a material discharging position. Among the three rollers, at least one is connected with a power assembly. In the material blocking position, the distances between the roller surfaces of the clamping roller and the blocking roller and the slope are respectively greater than and less than the outer diameter of the blank. In the material clamping position, the three rollers clamp the blank at a position intersecting with the laser emitted by the laser cutting assembly. In the material discharging position, the distances between the roller surfaces of the clamping roller and the blocking roller and the slope are both greater than the outer diameter of the blank. This cutting device eliminates the need for workers to perform operations such as blanking, fixing and contacting for fixing, greatly reducing the workload of workers, and is convenient to use, improving the cutting efficiency of drill pipe blanks.

Description

Technical Field

[0001] The present invention relates to drill pipe processing equipment, and in particular to a drill pipe cutting device. Background Art

[0002] A drill pipe is a steel pipe with threads at the tail, which is used to connect the surface equipment of a drilling rig and the drill grinding equipment or bottom hole equipment located at the bottom of the well, and is used to transport drilling mud to the drill bit and raise, lower or rotate the bottom hole device together with the drill bit.

[0003] During the production process of drill pipes, it is usually necessary to perform cutting treatment on tubular blanks with a fixed length to form drill pipe blanks, so as to process threads at the ends of the drill pipe blanks. In the prior art, due to the advantages of high precision, narrow cut seam, smooth cutting surface, good cutting quality, and no damage to the workpiece in laser cutting, a laser pipe cutting machine is usually used to cut tubular blanks.

[0004] When using a laser pipe cutting machine, first, workers need to adjust the axial position of the tubular blank (usually the laser cutting position is at the center of the blank), then fix the blank with a fixture, and then drive the blank to rotate by a motor. The laser head irradiates the blank vertically with laser to complete the cutting operation of the blank. After cutting, the operator loosens the fixture and removes the two cut blanks from the laser pipe cutting machine. From the above operation process of the laser pipe cutting machine, it can be seen that the existing drill pipe laser cutting machine has cumbersome operation steps. Workers need to perform cyclic operations of loading, adjusting the position of the blank, fixing the blank, cutting the blank, releasing the fixation, and unloading in sequence, which not only greatly increases the operation burden of workers, but also reduces the production efficiency.

[0005] Therefore, it is necessary to improve the drill pipe cutting device in the prior art. Summary of the Invention

[0006] The purpose of the present invention is to overcome the defects existing in the prior art and provide a drill pipe cutting device that is convenient to use, reduces the burden on workers, and improves production efficiency.

[0007] To achieve the above technical effects, the technical solution of the present invention is as follows: A drill pipe cutting device includes a frame, on which a slope and a laser cutting assembly located above the slope are provided; a rotating assembly is provided on the frame, and the rotating assembly includes three rollers that rotate around their own axis. One of them is a bottom roller protruding from the surface of the slope, and the other two are a clamping roller and a blocking roller respectively, and a driving assembly is connected to drive the two to circulate in sequence between a material blocking position, a material clamping position, and a material discharging position. The clamping roller is located between the blocking roller and the higher end of the slope. Among the three rollers, at least one is connected to a power assembly that drives its rotation; in the material blocking position, the distances between the roller surfaces of the clamping roller and the blocking roller and the slope are respectively greater than and less than the outer diameter of the blank; in the material clamping position, the three rollers clamp the blank at a position intersecting with the laser emitted by the laser cutting assembly; in the material discharging position, the distances between the roller surfaces of the clamping roller and the blocking roller and the slope are both greater than the outer diameter of the blank.

[0008] When the drill pipe cutting device of the above technical solution operates, in the initial state, the driving assembly adjusts the clamping roller and the blocking roller to the material blocking position. The worker places the blank at the higher end of the slope, makes the length direction of the blank consistent with the width direction of the slope, and then releases the blank. The tubular blank rolls down along the slope. After passing through the gap between the clamping roller and the slope, since the distance between the roller surface of the blocking roller and the slope is less than the outer diameter of the blank, the blank is blocked by the blocking roller.

[0009] Then, the driving assembly adjusts the clamping roller and the blocking roller to the material clamping position. In the material clamping position, the blocking roller, the clamping roller, and the bottom roller clamp the blank, and at this time, the position of the blank is at a position intersecting with the laser emitted by the laser cutting assembly, that is, when the laser cutting assembly operates, the laser it emits can act on the blank.

[0010] After the three rollers clamp the blank, the blank is in a radially locked position. At this time, the power assembly operates to drive one of the rollers to rotate. This roller drives the blank to rotate through friction, and then drives the other two rollers that are in contact with the blank to rotate. While the blank is rotating, the laser cutting assembly is activated to irradiate the blank with laser, and the blank is cut by the laser.

[0011] After the laser cuts the blank, the driving assembly controls the clamping roller and the blocking roller to be adjusted to the material discharging position. At this time, the distances between the roller surfaces of both the clamping roller and the blocking roller and the slope are greater than the outer diameter of the blank. In this way, it is convenient for the cut blank to roll down from the lower end along the slope. Below the lower end of the slope, the operator can pre-place a collection box to facilitate the collection of the cut drill pipe blanks that roll down from the lower end of the slope.

[0012] When the drill pipe cutting device is in use, the operator only needs to place the collection box at the lower end of the slope and place the blanks one by one at the higher end, so that the blanks roll down along the slope. Through the cooperation of the bottom roller, the stop roller and the clamping roller, the automatic radial positioning of the blanks is realized. Then, one of the rollers is driven to rotate by the rotating assembly, driving the blank to rotate, and cooperating with the operation of the laser cutting assembly to complete the cutting of the blank. After cutting, the stop roller discharges the blank, facilitating the cut blank to roll down from the lower end along the slope and into the collection box. Therefore, when the device is running, the operator only needs to be responsible for feeding, without performing operations related to discharging, fixing, and releasing fixation. Therefore, the work burden of the operator is greatly reduced, and the operation is convenient, which is beneficial to improving the cutting efficiency of the drill pipe blanks.

[0013] Preferably, the frame includes two end stoppers that are strip-shaped and arranged side by side in the width direction of the slope, and the two end stoppers are used for clearance fit with the two ends of the blank.

[0014] By adopting the above technical solution, the two end stoppers are respectively in clearance fit with the two ends of the blank, that is, the distance between the two end stoppers can allow the blank to roll down along the slope while ensuring that the axial direction of the blank is basically consistent with the width direction of the slope. In this way, after the blank contacts the stop roller at the material blocking position, the axial displacement of the blank is reduced, so as to ensure that the laser emitted by the laser cutting assembly can accurately act on the position of the blank to be cut, improving the cutting accuracy.

[0015] Preferably, a material distributing assembly for the blanks to roll towards the stop roller one by one is further arranged on the frame. The material distributing assembly includes two material distributing frames arranged above the slope, extending in the width direction of the slope and arranged side by side. Pressure sensors are arranged on both of the two material distributing frames, and both are connected with a first lifting unit for driving their lifting movement.

[0016] By adopting the above technical solution, the material distribution rack is driven by the first lifting unit to move up and down. When the material distribution rack moves downward until the gap between it and the slope is smaller than the outer diameter of the blank, the material distribution rack can block the blank from continuing to roll down along the slope. The pressure sensor is used to detect whether the material distribution rack bears the pressure from the blank. When a pressure signal is detected, it indicates that the blank is in contact with the material distribution rack at this time. During the actual operation of the equipment, the gaps between the two material distribution racks and the slope are pre-reduced. After the pressure sensor on the material distribution rack adjacent to the lower end detects the pressure from the blank, the first lifting unit drives this material distribution rack to move upward, causing the blank to roll downward and then descend to block the blanks on other slopes. The blank that passes through rolls onto another material distribution rack. After the pressure sensor on this material distribution rack detects the pressure from the blank, the first lifting unit drives this material distribution rack to move upward, causing the blank to continue to roll downward and contact the blocking roller. In this way, through the two material distribution racks, the pressure sensors on the material distribution racks, and the first lifting unit connected to the material distribution racks, the blanks can roll down the slope one by one in an orderly manner and contact the blocking roller.

[0017] Preferably, a plurality of deceleration members are arranged on the slope at intervals along its length direction.

[0018] By adopting the above technical solution, the deceleration members are used to conveniently decelerate the blanks rolling down the slope, preventing the rolling speed from being too high when the slope contacts the blocking roller, which may cause impact damage to the blocking roller.

[0019] Preferably, the deceleration members are detachably connected to the slope.

[0020] By adopting the above technical solution, the detachable connection between the deceleration members and the slope facilitates adjusting the number of deceleration members on the slope, thereby controlling the speed when the blank rolls down the slope and contacts the blocking roller, and avoiding impact damage to the blocking roller caused by excessive speed.

[0021] Preferably, the clamping roller and the blocking roller are connected by a roller frame, and the driving assembly is a second lifting unit arranged on the frame and whose output end is connected to the roller frame.

[0022] By adopting the above technical solution, the second lifting unit is used to drive the roller frame to move up and down, and then drive the clamping roller and the blocking roller on the roller frame to be adjusted to the material blocking position, the material clamping position or the material discharging position.

[0023] Preferably, there are two roller frames, and both are connected with axial positioning components, which respectively correspond to the two ends of the blank one by one. The axial positioning component includes an axial positioning frame and a plurality of balls arranged in a circumferential array. The balls rotate around their own ball centers on the axial positioning frame. In the material clamping position, the balls abut against the ends of the blank.

[0024] By adopting the above technical solution, after the second lifting unit adjusts the driving roller and the clamping roller from the material blocking position to the material clamping position, the balls on the two axial positioning frames axially position the blank from both ends. On the one hand, it prevents the blank from axially displacing during the cutting process and affecting the cutting accuracy. On the other hand, the balls abut against the ends of the blank, and the balls can rotate around their own centers, reducing the frictional force received when the blank rotates. In this way, it is convenient for the blank to keep rotating so that the laser cutting assembly can perform cutting processing on the blank.

[0025] Preferably, the bottom roller is connected to a power assembly that drives it to rotate around its own axis. There are two bottom rollers, which are spaced along the width direction of the slope.

[0026] By adopting the above technical solution, the connection between the bottom roller and the power assembly enables the driving assembly to adjust the positions of the clamping roller and the blocking roller without adjusting the position of the power assembly, reducing the load of the driving assembly; there are two bottom rollers to ensure the frictional force between the bottom roller and the blank. While facilitating the power assembly to drive the bottom roller to rotate, the bottom roller can drive the blank to rotate through the frictional force.

[0027] Preferably, the power assembly includes a power unit and two transmission units corresponding to the two bottom rollers respectively. The two transmission units both include a driven wheel fixedly connected to the corresponding bottom roller coaxially and a driving wheel connected to the output end of the power unit. The driving wheel is drivingly connected to the driven wheel through a synchronous belt; the power unit includes a driving motor fixed below the slope, a driving gear fixed to the output end of the driving motor, a driven gear meshing with the driving gear, and a power shaft fixedly connected to the driven gear coaxially. The two ends of the power shaft are fixedly connected to the driving wheels of the two transmission units coaxially.

[0028] By adopting the above technical solution, when driving the bottom roller to rotate, the power unit is started. The driving motor drives the driving gear to rotate, driving the meshing driven gear to rotate. The driven gear drives the driving wheels in the transmission units at both ends of the power shaft through the power shaft. The driving wheels then drive the driven wheels to rotate through the synchronous belt, causing the two bottom rollers to rotate synchronously, in the same direction, and at the same speed. The bottom roller makes the drill rod rotate around its own axis under the clamping action of the three rotating rollers through the frictional force.

[0029] Preferably, each of the three rotating rollers includes a rigid roller body and an elastic roller sleeve sleeved outside the roller body. There are matching protrusions and grooves arranged between the roller body and the roller sleeve and extending along the axial direction of the roller body.

[0030] By adopting the above technical solution, the rotating roller is composed of a rigid roller body and an elastic roller sleeve sleeved outside the roller body. When clamping the blank with three rotating rollers, the elastic roller sleeves of the three rotating rollers are in contact with the blank, ensuring the clamping force while facilitating the rotation of the blank. A convex strip and a groove are arranged between the roller body and the roller sleeve to ensure synchronous rotation between the roller body and the roller sleeve.

[0031] In summary, compared with the prior art, the drill pipe cutting device of the present invention drives the clamping roller and the retaining roller to adjust their positions through the driving assembly, and successively performs the operations of retaining the blank, clamping the blank, and discharging the blank for the blank rolling on the slope. When clamping the blank, the power assembly is started to drive the drill pipe to rotate, and the cutting is completed by the mechanism cutting assembly. This device does not require workers to perform the operations of blank feeding, fixing, and contact fixing, greatly reducing the work burden of workers, and is convenient to use, improving the cutting efficiency of the drill pipe blank. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a schematic structural diagram of the present invention;

[0033] Figure 2 is a schematic structural diagram of another perspective of the present invention;

[0034] Figure 3 is Figure 1 an exploded schematic diagram of

[0035] Figure 4 is Figure 1 a partial schematic diagram of

[0036] Figure 5 is a schematic structural diagram of the laser cutting assembly;

[0037] Figure 6 is a schematic connection structure diagram of the roller frame and the axial positioning frame;

[0038] Figure 7 is a schematic structural diagram of the rotating roller;

[0039] Figure 8 is Figure 7 an exploded schematic diagram of

[0040] Figure 9 is Figure 4 a partial schematic diagram of

[0041] Figure 10 is Figure 9 an exploded schematic diagram of

[0042] Figure 11 is a schematic structural diagram of the power assembly;

[0043] Figure 12 is a schematic connection structure diagram of the power assembly and the slope;

[0044] Figure 13 Yes Figure 4 Side view after omitting one of the drive units;

[0045] Figure 14 Schematic diagram of the working process of the pinch roller and the stop roller of the present invention;

[0046] In the figure: 100. Frame, 101. Foot, 102. Top frame, 103. End stop frame, 200. Ramp, 201. Inlet end, 202. Outlet end, 203. Jack, 204. Strip-shaped opening, 300. Laser cutting assembly, 301. Laser head, 302. Third lifting unit, 303. Adjusting block, 304. Adjusting motor, 305. Lead screw, 306. Bearing, 307. Slide bar, 400. Rotating roller, 401. Roller body, 402. Roller sleeve, 500. Bottom roller, 600. Pinch roller, 700. Stop roller, 800. Flat plate, 900. Material distributing assembly, 901. Material distributing frame, 902. Pressure sensor, 903. First lifting unit, 110. Reducing member, 111. Insert rod, 120. Roller frame, 130. Second lifting unit, 140. Axial positioning frame, 150. Ball, 160. Driven wheel, 170. Driving wheel, 180. Timing belt, 190. Power unit, 191. Driving gear, 192. Driven gear, 193. Power shaft, 194. Driving motor, 210. Rib, 220. Groove, 230. Blank, 240. Support ring, 250. Concentric shaft. Detailed implementation manners

[0047] The following combines the drawings and embodiments to further describe the detailed implementation manners of the present invention. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and cannot be used to limit the protection scope of the present invention.

[0048] As Figures 1 - 14 shown, the drill pipe cutting device of the present invention includes a frame 100, on which a ramp 200 and a laser cutting assembly 300 are provided, and the laser cutting assembly 300 is located directly above the ramp 200; the higher end of the ramp 200 is the inlet end 201, the lower end is the outlet end 202, and the higher inlet end 201 is integrally connected with a horizontal flat plate 800 for an operator to place a tubular blank 230.

[0049] As Figure 1 - As Figure 3As shown in the figure, the specific structure of the frame 100 is as follows: The frame 100 includes a number of feet 101 fixed below the ramp 200. The feet 101 are used to support the ramp 200 so that the ramp 200 maintains a certain inclination; it also includes two end brackets 103 fixed above the ramp 200. Both of the two end brackets 103 are plate-like structures arranged in the vertical direction. Their bottom surfaces are fixedly connected to the ramp 200, and the top ends are fixedly connected to a top frame 102.

[0050] As Figure 2 , Figure 4 and Figure 5 shown, the laser cutting assembly 300 includes a laser head 301 disposed directly below the top frame 102. The orientation of the laser head 301 is vertically downward, and the laser it emits is adjacent to the discharge end 202 of the ramp 200; a third lifting unit 302 for driving its lifting movement is fixed above the laser head 301. The third lifting unit 302 is specifically a lifting cylinder, which is disposed below the top frame 102, and its piston rod is fixedly connected to the laser head 301. Before cutting, there is a sufficient distance between the laser head 301 and the ramp 200 to prevent the blank 230 from colliding with the laser head 301 when rolling down along the ramp 200 and causing damage to the laser head 301; when the blank 230 needs to be cut, the third lifting unit 302 drives the laser head 301 to descend to reduce the distance between the laser head 301 and the blank 230, so that the laser emitted by the laser head 301 can cut the blank 230. After cutting is completed, the third lifting unit 302 drives the laser head 301 to rise to ensure that there is a sufficient distance between the laser head 301 and the ramp 200.

[0051] An adjustment unit is also provided between the third lifting unit 302 and the top frame 102. The adjustment unit is used to drive the third lifting unit 302 and the laser head 301 to move along the width direction of the ramp 200 to adjust the cutting position of the blank 230; the adjustment unit includes an adjustment motor 304 and a bearing 306 both fixed below the top frame 102. The output end of the adjustment motor 304 is coaxially fixedly connected to a lead screw 305. The end of the lead screw 305 away from the adjustment motor 304 is rotatably connected to the bearing 306 around its own axis. The lead screw 305 is threadedly connected to an adjustment block 303. The adjustment block 303 is fixedly connected to the cylinder body of the third lifting unit 302 (lifting cylinder). The adjustment unit also includes a slide bar 307 horizontally fixed below the top frame 102 through two connecting rods. The axial direction of the slide bar 307 is the same as the width direction of the ramp 200. The adjustment block 303 is sleeved outside the slide bar 307 to achieve its sliding fit with the slide bar 307.

[0052] When the adjusting unit is operating, the adjusting motor 304 starts, drives the lead screw 305 to rotate, acts on the adjusting block 303, and causes the adjusting block 303 to slide along the slide bar 307. Furthermore, it drives the third lifting unit 302 and the laser head 301 to move along the width direction parallel to the slope 200. In this way, the horizontal position of the laser head 301 is adjusted, facilitating the adjustment of the cutting position of the blank 230 according to actual needs during use.

[0053] The two end stoppers 103 are arranged side by side along the width direction of the slope 200 on both sides of the slope 200, and the two end stoppers 103 are used for clearance fit with the two ends of the blank 230. The end stoppers 103 extend along the slope 200 to directly above the flat plate 800. After the end stoppers 103 adopt the above structure and distribution, axial limitation of the blank 230 can be achieved through the two end stoppers 103. After the operator places the blank 230 on the flat plate 800, keep the axis of the blank 230 consistent with the width direction of the slope 200, so that the two ends of the blank 230 are in clearance fit with the end stoppers 103, avoiding the blank 230 from shifting along its axis and preventing the blank 230 from deflecting at the same time. When the blank 230 is pushed towards the slope 200 and rolls along the slope 200, its axis is always consistent with the width direction of the slope 200 to ensure that the cutting direction of the laser cutting assembly 300 is perpendicular to the axis of the blank 230.

[0054] As Figures 1 - 4 shown, two rotating components are further provided on the frame 100. The two rotating components are arranged along the width direction of the slope 200 and are adjacent to the discharge end 202 of the slope 200. The rotating component includes three rollers 400. All three rollers 400 rotate around their own axis. Among the three rollers 400, one is the bottom roller 500 protruding from the surface of the slope 200, and the other two are the clamping roller 600 and the retaining roller 700 respectively. Among them, the retaining roller 700 is located between the clamping roller 600 and the discharge end 202. The clamping roller 600 and the retaining roller 700 are connected with a driving component that drives them to move in sequence and circulate between the material retaining position, the material clamping position, and the material discharging position. And among the three rollers 400, at least one is connected with a power component that drives it to rotate;

[0055] In the material retaining position, the distances between the roller surfaces of the clamping roller 600 and the retaining roller 700 and the slope 200 are respectively greater than and less than the outer diameter of the blank 230;

[0056] In the material clamping position, the three rollers 400 clamp the blank 230 at a position intersecting with the laser emitted by the laser cutting assembly 300;

[0057] In the material discharging position, the distances between the roller surfaces of the clamping roller 600 and the retaining roller 700 and the slope 200 are both greater than the outer diameter of the blank 230.

[0058] Specifically, a strip-shaped opening 204 is provided on the slope 200. The strip-shaped opening 204 is disposed adjacent to the discharge end 202 of the slope 200 and extends along the width direction of the slope 200. The bottom rollers 500 in the two rotating assemblies are respectively located at both ends of the strip-shaped opening 204. The axial direction of the bottom roller 500 is consistent with the length direction of the strip-shaped opening 204. The bottom roller 500 rotates around its own axis inside the strip-shaped opening 204, and the roller surface of the bottom roller 500 intersects the plane where the bearing surface of the slope 200 is located, that is, a part of the bottom roller 500 protrudes from the surface of the slope 200.

[0059] As Figure 1 and Figure 6 shown, the pinch roller 600 and the stop roller 700 are connected by a roller frame 120. The roller frame 120 is disposed directly below the top frame 102. The driving assembly is a second lifting unit 130 disposed between the top frame 102 and the roller frame 120. The second lifting unit 130 is specifically a lifting cylinder, whose cylinder barrel is fixedly connected to the top frame 102, and the piston rod is fixedly connected to the roller frame 120 to drive the roller frame 120 to move up and down, driving the pinch roller 600 and the stop roller 700 on the roller frame 120 to move up and down synchronously, and circulating between the material blocking position, the material clamping position and the material discharging position in turn. The roller frame 120 has two ends in total, corresponding to the two rotating assemblies one by one. An axial positioning assembly is connected to one side of the roller frame 120, corresponding to both ends of the blank 230. The axial positioning assembly includes an axial positioning frame 140, which is composed of an L-shaped rod and an annular axial positioning ring. The axial positioning ring is fixedly connected to the roller frame 120 through the L-shaped rod. The axial center line direction of the axial positioning ring extends along the width direction of the slope 200, and a circumferentially circumferentially arrayed ball 150 is provided on one side of the axial positioning ring. The ball 150 can rotate around its own ball center in any direction on the axial positioning ring. When the equipment is running, after the blank 230 rolls along the slope 200 and contacts the stop roller 700 at the material blocking position, the second lifting unit 130 drives the pinch roller 600 and the stop roller 700 to move to the material clamping position through the roller frame 120. While the roller frame 120 moves, the axial positioning frame 140 moves synchronously, so that the ball 150 abuts against the end of the blank 230. At this time, in the axial positioning assemblies corresponding to the two rotating assemblies, the balls 150 respectively abut against the ends of the blank 230 to achieve axial positioning of the blank 230 (as Figure 1 and Figure 4 shown), while preventing the blank 230 from axially shifting, it is convenient for the blank 230 to rotate around its own axis.

[0060] After adopting the above structure, when the device is running, as Figure 14As shown in (a), first, the second lifting unit 130 drives the roller frame 120 to descend, so that the pinch roller 600 and the stop roller 700 are adjusted to the material blocking position. At this time, the distance between the roller surface of the pinch roller 600 and the slope 200 is greater than the outer diameter of the blank 230, while the distance between the roller surface of the stop roller 700 and the slope 200 is less than the outer diameter of the blank 230. Therefore, when the blank 230 rolls down from the feeding end 201 on the slope 200, the blank 230 passes through the gap between the slope 200 and the pinch roller 600 and is blocked by the stop roller 700 and no longer rolls down, as Figure 14 shown in (b);

[0061] After a blank 230 abuts against the side of the stop roller 700 adjacent to the feeding end 201, the second lifting unit 130 drives the roller frame 120 to descend, so that the pinch roller 600 and the stop roller 700 are adjusted to the material clamping position, as Figure 14 shown in (c). At this time, the blank 230 rolls up along the slope 200 and is clamped between the bottom roller 500, the pinch roller 600 and the stop roller 700, that is, the circumferential roller surfaces of the three rotating rollers 400 are in contact with the blank 230. Moreover, at this time, both ends of the blank 230 are respectively abutted against the balls 150 on the two axial positioning frames 140, that is, the axial positioning of the blank 230 is realized through the balls 150 on the axial positioning frames 140 to prevent the axial deviation of the blank 230. And because the three rotating rollers 400 clamping the blank 230 can all rotate around their own axis lines, and the end of the blank 230 abuts against the ball 150, it is convenient for the blank 230 to rotate around its own axis line. In addition, at this time, the blank 230 is directly below the laser head 301. When the laser head 301 emits laser, the straight line where the laser is located is perpendicular to and intersects the axis line of the blank 230. Therefore, by driving one of the three rotating rollers 400 to rotate through the power assembly and relying on the frictional force between the rotating roller 400 and the blank 230, the blank 230 can be driven to rotate, and then the laser head 301 emits laser to perform laser cutting on the rotating blank 230;

[0062] After the cutting is completed, the second lifting unit 130 drives the roller frame 120 to rise, and the pinch roller 600 and the stop roller 700 are adjusted to the material discharging position, as Figure 14 shown in (d). At this time, both the distance between the roller surface of the pinch roller 600 and the slope 200 and the distance between the roller surface of the stop roller 700 and the slope 200 are greater than the outer diameter of the blank 230. After losing the block of the stop roller 700, the drill pipe blank 230 cut into two ends rolls down along the slope 200 and falls from the discharging end 202. Therefore, the operator only needs to place a collecting device such as a collecting box below the discharging end 202 to collect the cut blank 230;

[0063] After the cut blank 230 passes through the gap between the stop roller 700 and the slope 200, the second lifting unit 130 drives the roller frame 120 to descend, so that the clamping roller 600 and the stop roller 700 move to the material blocking position to block other blanks 230 rolling down from the feeding end 201. Then, according to the above working process, the second lifting unit 130 drives the roller frame 120 to move, changing the positions of the clamping roller 600 and the stop roller 700. That is, whenever a blank 230 rolls down on the slope 200, the second lifting unit 130 drives the roller frame 120 to lift and move, so that the clamping roller 600 and the stop roller 700 sequentially descend from the material blocking position to the material clamping position, then rise to the material discharging position, and finally return to the material blocking position.

[0064] As Figure 7 and Figure 8 shown, the three rotating rollers 400 have a rigid roller body 401 and a roller sleeve 402 sleeved outside the roller body 401. The two ends of the roller body 401 are flush with the two ends of the roller sleeve 402. The roller body 401 is a steel roller body 401 to ensure its rigidity, and the roller sleeve 402 is an elastic roller sleeve, specifically a rubber roller sleeve (of course, it can also be a roller sleeve made of other elastic materials such as silica gel). The outer circumference of the roller body 401 has three evenly distributed grooves 220, and the grooves 220 extend along the axial direction of the roller body 401 to both ends of the roller body 401. The inner circumference of the roller sleeve 402 has three evenly distributed ridges 210, and the ridges 210 extend along the axial direction of the roller sleeve 402 to both ends of the roller sleeve 402. The ridges 210 correspond to and are adapted to the grooves 220 one by one.

[0065] After adopting the above structure, the bottom roller 500, the clamping roller 600 and the stop roller 700 are all composed of the roller body 401 and the roller sleeve 402. When the stop roller 700 is in the material blocking position, if the blank 230 rolls down along the slope 200 and contacts the stop roller 700, the elastic roller sleeve 402 outside the stop roller 700 can deform to absorb part of the energy of the rigid blank 230 and elastically buffer the blank 230 in motion, avoiding direct contact and expansion between the rigid blank 230 and the rigid roller body 401, resulting in deformation and damage of the blank 230 and the stop roller 700. When the stop roller 700 and the clamping roller 600 are in the material clamping position, the roller sleeves 402 on the three rotating rollers 400 elastically deform, so that the roller sleeves 402 are in full contact with the blank 230, ensuring sufficient friction between the blank 230 and the roller sleeves 402. When the power assembly drives one of the rotating rollers 400 to rotate, the blank 230 rotates. And because the roller sleeve 402 is an elastic roller sleeve 402, the surface of the blank 230 is prevented from being worn. Moreover, the grooves 220 and the ridges 210 between the roller sleeve 402 and the roller body 401 ensure that the two can rotate synchronously around the axis of the rotating roller 400, avoiding relative rotation between the two.

[0066] The bottom roller 500 is connected with a power assembly that drives it to rotate around its own axis. In this way, the power assembly is prevented from being directly connected to the pinch roller 600 and the stop roller 700, thereby reducing the complexity when the second lifting unit 130 drives the pinch roller 600 and the stop roller 700 to move up and down.

[0067] As Figures 11 - 13 shown, the specific structure of the power assembly includes a power unit 190 and two transmission units. The two transmission units correspond to the bottom rollers 500 in the two rotating assemblies one by one. That is, when the power unit 190 operates, the two bottom rollers 500 are driven to rotate synchronously, in the same direction and at the same speed through the two transmission units respectively. Specifically, the power unit 190 is arranged below the slope 200 and includes a driving motor 194. A driving gear 191 is fixedly connected to the output end of the driving motor 194 coaxially. The power unit 190 further includes a driven gear 192 arranged below the slope 200. The driving gear 191 meshes with the driven gear 192. A power shaft 193 passing through the driven gear 192 is fixedly connected to the driven gear 192 coaxially. The axial direction of the power shaft 193 is consistent with the width direction of the slope 200, and both ends of the power shaft 193 are connected to the two transmission units respectively. Two support rings 240 are also fixed on both sides below the slope 200 and are respectively sleeved outside both ends of the power shaft 193 to support the stable rotation of the power shaft 193 around its own axis.

[0068] The transmission unit includes a driving wheel 170 fixedly connected to the end of the power shaft 193 coaxially. The driving wheel 170 is drivingly connected to a driven wheel 160 through a synchronous belt 180. The driven wheel 160 is fixedly connected to the roller body 401 of the bottom roller 500 coaxially through a concentric shaft 250.

[0069] When the power assembly adopts the above structure and it is necessary to drive the bottom roller 500 to rotate, the driving motor 194 is started to drive the driving gear 191 to rotate, which acts on the driven gear 192 meshing with it, causing the driven gear 192 to rotate. The driven gear 192 drives the driving wheels 170 at both ends of the power shaft 193 to rotate synchronously through the power shaft 193. The driving wheel 170 drives the driven wheel 160 to rotate through the synchronous belt 180, and through the concentric shaft 250, the bottom rollers 500 in the two rotating assemblies rotate synchronously, in the same direction and at the same speed.

[0070] As Figure 4 、 Figure 9 and Figure 10As shown, a number of deceleration members 110 are also provided on the slope 200. The deceleration members 110 are strip-shaped and are arranged side by side along the length direction of the slope 200. The deceleration members 110 are detachably connected to the slope 200. Specifically, insertion holes 203 are provided on the slope 200, and a number of insertion rods 111 are arranged at intervals along the length direction of the bottom surface of the deceleration member 110. Through the insertion fit between the insertion rods 111 and the insertion holes 203, a convenient detachable connection between the deceleration member 110 and the slope 200 is realized.

[0071] After the deceleration members 110 are provided on the slope 200, the blanks 230 rolling on the slope 200 can be decelerated, thereby reducing the collision speed and kinetic energy when the blanks 230 contact the retaining rollers 700, preventing the rolling speed of the blanks 230 from being too fast, and avoiding damage to the retaining rollers 700 after the blanks 230 collide with the retaining rollers 700. Moreover, through the insertion fit between the insertion holes 203 and the insertion rods 111, a quick detachable connection between the deceleration member 110 and the slope 200 is realized, which is convenient for adjusting the number of the deceleration members 110 on the slope 200 to adjust the deceleration degree of the blanks 230 rolling on the slope 200.

[0072] As Figure 1 and Figure 3 As shown, a blank separating assembly 900 for guiding the blanks 230 to roll towards the retaining rollers 700 one by one is further provided on the frame 100. The blank separating assembly 900 includes two separating frames 901 provided directly above the slope 200. The two separating frames 901 are both strip-shaped and extend along the width direction of the slope 200 and are arranged side by side; two strip-shaped through holes extending in the vertical direction are provided on the end retaining frame 103. The two ends of the separating frame 901 are both long rod-shaped and are inserted into the inner sides of the through holes of the end retaining frame 103, and are connected with a first lifting unit 903 for driving the separating frame 901 to move up and down. The first lifting unit 903 is specifically a lifting cylinder, the cylinder barrel of which is fixed to one side of the slope 200, and the piston rod is fixedly connected to the separating frame 901.

[0073] When the device is running, the first lifting unit 903 drives the blank dividing rack 901 to move downward, so that the gap between the blank dividing rack 901 and the slope 200 is not enough for the blank 230 to pass through. Both blank dividing racks 901 move to the above position. Then, the operator conveys the blank 230 to the slope 200 through the flat plate 800. After the blank 230 rolls along the slope 200, it first abuts against the blank dividing rack 901 adjacent to the feeding end 201. Then, the first lifting unit 903 drives this blank dividing rack 901 to move upward, so that the blank 230 can pass through this blank dividing rack 901 and roll to abut against the other blank dividing rack 901. While the blank 230 is passing through, the first lifting unit 903 drives the blank dividing rack 901 adjacent to the feeding end 201 to move downward until the blank 230 cannot pass between this blank dividing rack 901 and the slope 200. After the blank 230 passing through this blank dividing rack 901 rolls along the slope 200 and contacts the other blank dividing rack 901, the first lifting unit 903 drives the other blank dividing rack 901 to move upward, so that the blank 230 can continue to roll downward along the slope 200 until it contacts the retaining roller 700. While the blank 230 is passing through the other blank dividing rack 901, the first lifting unit 903 drives the other blank dividing rack 901 to move downward. In this way, the blanks 230 on the slope 200 roll towards the retaining roller 700 one by one. In order to facilitate the detection of whether there is a blank 230 contacting the blank dividing rack 901, pressure sensors 902 are arranged on one side of both blank dividing racks 901 adjacent to the feeding end 201. After the pressure sensors 902 detect the pressure signal, the first lifting unit 903 drives the blank dividing rack 901 corresponding to this pressure sensor 902 to rise, facilitating the passage of the blank 230.

[0074] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art of this technology, without departing from the technical principle of the present invention, several improvements and refinements can still be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A drill pipe cutting device, characterized in that: it includes a frame (100), on which a slope (200) and a laser cutting assembly (300) located above the slope (200) are provided; a roller assembly is provided on the frame (100), the roller assembly includes three rollers (400) rotating around their own axis, one of which is a bottom roller (500) protruding from the surface of the slope (200), and the other two are a pinch roller (600) and a stop roller (700) respectively, and a driving assembly is connected to drive them to move cyclically in sequence between a material blocking position, a material clamping position and a material discharging position. The pinch roller (600) is located between the stop roller (700) and the higher end of the slope (200). Among the three rollers (400), at least one is connected to a power assembly for driving its rotation; In the material blocking position, the distances between the roller surfaces of the pinch roller (600) and the stop roller (700) and the slope (200) are respectively greater than and less than the outer diameter of the blank; In the material clamping position, the three rollers (400) clamp the blank at a position intersecting with the laser emitted by the laser cutting assembly (300); In the material discharging position, the distances between the roller surfaces of the pinch roller (600) and the stop roller (700) and the slope (200) are both greater than the outer diameter of the blank; the pinch roller (600) and the stop roller (700) are connected by a roller frame (120), and the driving assembly is a second lifting unit (130) provided on the frame (100) and whose output end is connected to the roller frame (120); two roller frames (120) are provided, and both are connected with axial positioning components, corresponding to the two ends of the blank one by one. The axial positioning components include an axial positioning frame (140) and a circumferentially arrayed distribution of balls (150). The balls (150) rotate around their own ball centers on the axial positioning frame (140). In the material clamping position, the balls (150) abut against the ends of the blank.

2. The drill pipe cutting device according to claim 1, characterized in that: the frame (100) includes two end stop frames (103) in a long strip shape and arranged side by side in the width direction of the slope (200), and the two end stop frames (103) are used for clearance fit with the two ends of the blank.

3. The drill pipe cutting device according to claim 1, characterized in that: a material distributing assembly (900) for allowing the blanks to roll towards the stop roller (700) one by one is further provided on the frame (100). The material distributing assembly (900) includes two material distributing frames (901) arranged side by side and extending in the width direction of the slope (200) and provided directly above the slope (200). Pressure sensors (902) are provided on both of the two material distributing frames (901), and both are connected with a first lifting unit (903) for driving their lifting and moving.

4. The drill pipe cutting device according to claim 1, characterized in that: a plurality of deceleration members (110) are further provided on the slope (200) at intervals along its length direction.

5. The drill pipe cutting device according to claim 4, characterized in that: The decelerating member (110) is detachably connected to the ramp (200).

6. The drill pipe cutting device according to claim 1, wherein: The bottom rollers (500) are connected with a power assembly for driving them to rotate around their own axis lines, and there are two bottom rollers (500), which are spaced apart along the width direction of the ramp (200).

7. The drill pipe cutting device according to claim 6, wherein: The power assembly includes a power unit (190) and two transmission units corresponding to the two bottom rollers (500) respectively. Both of the two transmission units include a driven wheel (160) fixedly connected coaxially with the corresponding bottom roller (500) and a driving wheel (170) connected to the output end of the power unit (190). The driving wheel (170) is drivingly connected to the driven wheel (160) through a synchronous belt (180); the power unit (190) includes a driving motor (194) fixed below the ramp (200), a driving gear (191) fixed to the output end of the driving motor (194), a driven gear (192) meshing with the driving gear (191), and a power shaft (193) fixedly connected coaxially with the driven gear (192). The two ends of the power shaft (193) are fixedly connected coaxially with the driving wheels (170) of the two transmission units respectively.

8. The drill pipe cutting device according to claim 1, wherein: Each of the three rotating rollers (400) includes a rigid roller body (401) and an elastic roller sleeve (402) sleeved outside the roller body (401). A rib (210) and a groove (220) which are adapted to each other and extend axially along the roller body (401) are arranged between the roller body (401) and the roller sleeve (402).

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