Accurate feeding device for thickened oil pipe

Abstract

The invention relates to the technical field of oil pipe feeding devices, in particular to a thickened oil pipe accurate feeding device which comprises sliding rails, sliding blocks and a tackle, the sliding blocks are installed on the two sliding rails arranged in a front-back spaced mode in a matched mode, the tackle is fixedly installed on the upper sides of the sliding blocks, and the tackle comprises a sliding plate, a pipe clamping head mechanism and a driving mechanism. The sliding plate is provided with a pipe clamping head mechanism and a driving mechanism capable of driving the sliding block to move to a designated position on the sliding rail. The device is reasonable and compact in structure and convenient to use, by arranging the sliding rails and the sliding blocks, movement of the pipe clamping head on the sliding plate is facilitated, friction is reduced, by arranging the driving mechanism, the sliding plate is driven to move and stop at a designated position, and the problems that positioning errors exist in chain transmission and inertia movement of a trolley exists are solved.

Description

Technical Field

[0001] The invention relates to the technical field of oil pipe feeding devices, in particular to a precise feeding device for thickened oil pipes. Background Art

[0002] The thickened oil pipe feeding device is a device that feeds the end of the petroleum oil pipe with an outer diameter of φ73 or φ89, a length of 9.2-9.8m, and an end 400mm heated to about 1200℃ into the hydraulic press die for upsetting, and removes the finished product from the hydraulic press die. The whole process is fully automated.

[0003] At present, the operating principle of the feeding device is: the pipe clamping trolley clamps the middle part of the oil pipe, and the reduction motor drives the pipe clamping trolley to advance or withdraw the pipe through the chain mechanism after receiving the PLC instruction. The pipe clamping method adopts a scissors-like pipe clamping method. After detecting that a new oil pipe has entered the workstation, all support rollers rise, the trolley clamps the oil pipe, the PLC detects that the trolley is at the origin, and the trolley starts to move forward. When the photoelectric switch in the hydraulic press detects the end of the oil pipe, the trolley brakes and releases the oil pipe, the support rollers descend and put the oil pipe into the mold. After the hydraulic press detects that the oil pipe has fallen into the mold, it starts to perform hydraulic press upsetting. At the same time, the trolley retreats to the trolley origin and then moves forward for the second time. After the proximity switch of the trolley's second forward deceleration position detects the trolley, the trolley slows down and moves to the trolley's material retraction starting position and stops to wait. When the PLC receives the end of upsetting, the support rollers rise again to separate the oil pipe from the mold, the trolley clamps the oil pipe again, and then the trolley retreats. When the trolley retraction signal detects the other end of the pipe, the trolley brakes and releases the oil pipe, the support rollers descend, and the material tapper transfers the oil pipe out of this workstation and transfers a new oil pipe at the same time, starting the production cycle of a new oil pipe. The reason why the trolley moves forward twice: the trolley needs to align with the next workstation when withdrawing the material, so the withdrawal distance is about 0.1m longer than the feeding distance. However, the transmission mechanism of the "reduction motor + inverter + chain" is difficult to move and position over short distances with poor accuracy due to chain slack, inability to start and stop the mechanism in a short time, and mechanism inertia. That is, the trolley can only move and position over long distances and cannot move accurately by 0.1m. Therefore, the trolley moves forward for the second time and then withdraws the material over a long distance, so that the trolley can return the material to the right position and stop at the origin at the same time.

[0004] The main problems are: 1) The mechanical system has a high failure rate. Since the total length of the chain exceeds 6m, there is a large degree of slack. Although a tensioner is set, the chain frequently breaks when it is loosened, and the chain breaks and sprocket wear frequently occur when it is tightened. The reliability of the chain mechanism is not high. In addition, due to the error in the length of the oil pipe and the positioning error of the trolley, and the trolley has no return function after the pipe is withdrawn, the trolley is frequently not in the original position after the material is withdrawn, resulting in program signal failure; 2) The clamping force of the pipe clamping device is not enough, the clamping force is 368N, and the pipe frequently moves when the trolley is braked, resulting in inaccurate signals of the proximity switch and photoelectric switch, and frequent transmission system failures; 3) The feeding accuracy is not enough. Since the total mass of the trolley and the oil pipe is 252kg, the chain mechanism has poor braking effect. After the trolley stops, it will move by inertia, resulting in a large feeding and retracting error of 0-43mm. Signal errors frequently occur, causing system failure.

[0005] This results in a high failure rate in the production line, with the failure time of the feeding device accounting for 80% of the total failure time of the production line, seriously affecting normal production. Summary of the invention

[0006] The present invention provides a device for accurately feeding thickened oil pipes, which overcomes the deficiencies of the above-mentioned prior art and can effectively solve the problem of positioning error existing in the prior art of using a chain mechanism to drive a trolley to feed and withdraw materials, as well as the problem of oil pipe movement caused by insufficient clamping force of the prior clamping head.

[0007] The technical solution of the present invention is achieved through the following measures: a thickened oil pipe precision feeding device, including a slide rail, a slider and a pulley, two slide rails arranged at a front and rear interval are equipped with sliders, a pulley is fixedly installed on the upper side of the slider, the pulley includes a slide plate, a pipe clamping head mechanism and a driving mechanism, the slide plate is provided with a pipe clamping head mechanism and a driving mechanism that can drive the slider to move to a specified position on the slide rail.

[0008] The following are further optimizations and / or improvements to the above technical solutions: The above-mentioned pipe clamping head mechanism may include a supporting assembly and a first clamping assembly, the supporting assembly includes a first supporting frame, a second supporting frame, and a third supporting frame, two first supporting frames are fixedly installed at an interval on the front and rear sides of the upper side of the slide, the second supporting frames are installed on the upper left side and the upper right side of the two first supporting frames, the third supporting frames are fixedly installed on the upper sides of the two second supporting frames located on the left and the two second supporting frames located on the right, the first clamping assembly includes a cylinder, a supporting plate, a front clamp and a rear clamp, a cylinder installed on the first supporting frame at the lower side is provided between the second supporting frames on the left and right sides, a supporting plate is installed on the cylinder protruding end located at the upper end of the cylinder, a front clamp and a rear clamp in the shape of “>” are provided on the upper side of the supporting plate, the middle part of the front clamp and the rear clamp are hinged together by a rotating shaft, the left end and the right end of the rotating shaft are installed in the bearing seat, and the two bearing seats located on the left and right sides are fixedly installed on the upper sides of the two third supporting frames respectively.

[0009] The clamping head mechanism may further include a second clamping head assembly, which is located between two bearing seats. The second clamping head assembly has the same structure as the first clamping head assembly but a different clamping tube size. The rotating shaft of the first clamping head assembly is integrally arranged with the rotating shaft of the second clamping head assembly.

[0010] The lower ends of the front chuck and the rear chuck can be equipped with bearings.

[0011] The above-mentioned driving mechanism may include a servo motor, a reducer, a gear and a rack. A rack is fixedly installed between the two slide rails. The servo motor is transmission connected to the reducer. The output end of the reducer is transmission connected to a gear shaft. The gear shaft passes through the slide board, and the gear is transmission connected to the rack.

[0012] The above may also include a controller, a solenoid valve and a position sensor. A solenoid valve is provided on the air control pipeline of the cylinder, and a position sensor for monitoring the position of the support plate is provided on the second support frame corresponding to the position of the support plate. The servo motor, solenoid valve and position sensor are respectively connected to the controller.

[0013] The above may also include a limit position normally closed photoelectric switch, and a limit position normally closed photoelectric switch is provided between the two slide rails corresponding to the left and right ends of the slide rail, and the limit position normally closed photoelectric switch is connected to the controller.

[0014] The above may also include a bracket, a left telescopic protective cover and a right telescopic protective cover, two slide rails are installed in the bracket, the left end and the right end of the left telescopic protective cover are respectively fixed to the left part of the bracket and the left side of the slide board, and the left end and the right end of the right telescopic protective cover are respectively fixed to the right side of the slide board and the right part of the bracket.

[0015] The invention has a reasonable and compact structure and is easy to use. It provides a slide rail and a slider to facilitate the movement of the pipe clamping head on the slide and reduce friction. It provides a driving mechanism to drive the slide to move and stop at a specified position, thereby solving the problems of positioning error in chain transmission and inertial movement of the trolley. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Attached Figure 1 It is a schematic diagram of the main structure when the right telescopic protective cover of an embodiment of the present invention is opened.

[0017] Attached Figure 2 For attachment Figure 1 Schematic diagram of the three-dimensional structure of the pulley.

[0018] Attached Figure 3 For attachment Figure 1 Schematic diagram of the three-dimensional structure.

[0019] The codes in the accompanying drawings are: 1 is a slide rail, 2 is a slider, 3 is a slide plate, 4 is a first support frame, 5 is a second support frame, 6 is a third support frame, 7 is a cylinder, 8 is a support plate, 9 is a front chuck, 10 is a rear chuck, 11 is a rotating shaft, 12 is a bearing seat, 13 is a bearing, 14 is a servo motor, 15 is a reducer, 16 is a gear, 17 is a rack, 18 is a position sensor, 19 is a normally closed photoelectric switch in the limit position, 20 is a bracket, 21 is a left telescopic protective cover, 22 is a right telescopic protective cover, and 23 is a clamp tooth. DETAILED DESCRIPTION

[0020] The present invention is not limited by the following embodiments, and specific implementation methods can be determined based on the technical solution of the present invention and actual conditions.

[0021] In the present invention, for the convenience of description, the relative position relationship of each component is described according to the attached Figure 1 The positional relationships such as front, back, top, bottom, left, and right are described according to the layout directions of the drawings in the specification.

[0022] The present invention will be further described below in conjunction with embodiments and drawings: Embodiment 1: As attached Figure 1 , 2 As shown in Figures 3, the thickened oil pipe precision feeding device includes a slide rail 1, a slider 2 and a pulley. The two slide rails 1 spaced apart in the front and rear are equipped with sliders 2. The pulley is fixedly installed on the upper side of the slider 2. The pulley includes a slide plate 3, a tube clamping head mechanism and a driving mechanism. The slide plate 3 is provided with a tube clamping head mechanism and a driving mechanism that can drive the slider 2 to move to a specified position on the slide rail 1.

[0023] As required, the driving mechanism can be a gear 16 rack 17 mechanism, so that the positioning is more precise and controllable.

[0024] When in use, the driving mechanism pulls the slide plate 3 to drive the clamping head mechanism to move to the feeding position. After the upsetting of the oil pipe end is completed, the clamping head mechanism clamps the oil pipe and moves it to the unloading position. After the unloading is completed, the pulley moves to the initial position to wait for the next feeding. The pulley can be accurately positioned through the slide rail 1, the slider 2 and the pulley mechanism, which is convenient for the system to perform automatic feeding and unloading control, solving the problems of large chain structure slack, low reliability, large positioning error and further positioning deviation caused by the inertia of the trolley.

[0025] The above-mentioned upholstered tubing precise feeding device can be further optimized and / or improved according to actual needs: Embodiment 2: As attached Figure 1 , 2As shown in Figure 3, the clamp head mechanism includes a support assembly and a first clamp assembly, the support assembly includes a first support frame 4, a second support frame 5, and a third support frame 6. Two first support frames 4 are fixedly installed on the upper side of the slide 3 at intervals in front and back, and the second support frames 5 are installed on the upper left and right sides of the two first support frames 4. The third support frame 6 is fixedly installed on the upper sides of the two second support frames 5 on the left and the two second support frames 5 on the right. The first clamp assembly includes a cylinder 7, a support plate 8, and a front clamp. 9 and a rear chuck 10, a cylinder 7 mounted on the lower side on the first support frame 4 is provided between the second support frames 5 on the left and right sides, a support plate 8 is installed on the protruding end of the cylinder 7 located at the upper end of the cylinder 7, and a front chuck 9 and a rear chuck 10 in a “>” shape are provided on the upper side of the support plate 8, the front chuck 9 and the rear chuck 10 are hinged together in the middle part by a rotating shaft 11, the left and right ends of the rotating shaft 11 are installed in a bearing seat 12, and the two bearing seats 12 located on the left and right parts are fixedly installed on the upper sides of the two third support frames 6 respectively.

[0026] According to the requirements, three clamp teeth 23 can be installed on the clamping surface of the front clamp head and the rear clamp head. The surface of the clamp teeth 23 is treated by surface quenching process, and the hardness is not less than HB250, which can clamp more firmly. When in use, the cylinder 7 adopts a thin guide rail cylinder 7, and the initial position of the support plate 8 is that the cylinder 7 retracts the front clamp 9 and the rear clamp 10 are in an open state. When it is necessary to clamp the oil pipe, the extended end of the cylinder 7 extends upward to push the support plate 8 upward, and the support plate 8 pushes the lower end of the front clamp 9 and the rear clamp 10, so that the upper part of the front clamp 9 rotates backward around the rotation axis 11, and the upper part of the rear clamp 10 rotates forward around the rotation axis 11, so that the upper part of the front clamp 9 and the rear clamp 10 clamps the oil pipe, and the clamping force is not less than 1500N. When it is necessary to loosen the oil pipe, the extended end of the cylinder 7 is retracted, and the front clamp 9 and the rear clamp 10 automatically open under the action of gravity, thereby loosening the oil pipe. The pipe clamping head mechanism provided in the present invention is easier to control and has a greater clamping force, thereby avoiding the problem of inaccurate positioning caused by movement of the oil pipe.

[0027] Embodiment 3: As attached Figure 1 , 2 As shown in FIG. 3 , the tube clamping head mechanism also includes a second clamping head assembly, which is located between two bearing seats 12. The second clamping head assembly has the same structure as the first clamping head assembly but has a different tube clamping size. The rotating shaft 11 of the first clamping head assembly is integrally arranged with the rotating shaft 11 of the second clamping head assembly.

[0028] The two clamp head assemblies are φ73mm clamp head and φ89 clamp head, which clamp oil pipes of different diameters respectively. When one set of clamp head assemblies is working, the cylinder 7 under the other set of clamp head assemblies is in the initial state of retracting the extended end, that is, the clamp head assembly is in a loose state, which does not affect the operation of other clamp head assemblies.

[0029] Embodiment 4: As attached Figure 1 ,2 As shown in 3, bearings 13 are installed at the lower ends of the front chuck 9 and the rear chuck 10.

[0030] When in use, the cylinder 7 pushes the support plate 8 to rotate the front chuck 9 and the rear chuck 10 to clamp or loosen the oil pipe. Therefore, the bearing 13 can reduce the friction at the lower end of the front chuck 9 and the rear chuck 10.

[0031] Embodiment 5: As attached Figure 1 , 2 As shown in Figure 3, the driving mechanism includes a servo motor 14, a reducer 15, a gear 16 and a rack 17. The rack 17 is fixedly installed between the two slide rails 1. The servo motor 14 is transmission-connected to the reducer 15. The output end of the reducer 15 is transmission-connected to the gear 16 shaft. The gear 16 shaft passes through the slide 3, and the gear 16 is transmission-connected to the rack 17.

[0032] When in use, the servo motor 14 drives the reducer 15 to rotate, and the reducer 15 drives the gear 16 to move along the rack 17, thereby driving the pulley to move as a whole. The transmission method of the gear 16 and the rack 17 can make the pulley movement accuracy reach ±1mm, and the movement of the pulley can be controlled by controlling the number of rotations, rotation direction and rotation speed of the servo motor 14, which makes the control more convenient and more accurate.

[0033] Embodiment 6: As attached Figure 1 , 2 3, it also includes a controller, a solenoid valve and a position sensor 18. A solenoid valve is provided on the air control pipeline of the cylinder 7, and a position sensor 18 for monitoring the position of the support plate 8 is provided on the second support frame 5 corresponding to the position of the support plate 8. The servo motor 14, the solenoid valve and the position sensor 18 are respectively connected to the controller.

[0034] When in use, the electromagnetic valve is set to select which cylinder 7 to supply air to, and the size of the oil pipe and the corresponding clamp head assembly is selected. The initial position of the support plate 8 is monitored by setting the position sensor 18. The initial position of the support plate 8 is that the front clamp 9 and the rear clamp 10 are in the loose state when the cylinder 7 retracts. According to the position of the support plate 8, it is determined whether the oil pipe is clamped, whether to proceed to the next feeding or withdrawing operation, and the oil pipe is fully automatically fed and withdrawn through linkage. The controller is a PLC.

[0035] Embodiment 7: As attached Figure 1 , 2 As shown in 3, it also includes a limit position normally closed photoelectric switch 19, and a limit position normally closed photoelectric switch 19 is provided between the two slide rails 1 corresponding to the left and right ends of the slide rail 1, and the limit position normally closed photoelectric switch 19 is connected to the controller.

[0036] The normally closed photoelectric switch 19 at the limit position can prevent the slide from rushing over the limit position. When the normally closed photoelectric switch 19 at the limit position detects that the pulley has reached the vicinity of the end of the track, the PLC controls the servo motor 14 to stop. The control console is equipped with an emergency stop switch to stop the pulley movement at any time, and a pulley stop procedure is set in case of hydraulic press failure.

[0037] Embodiment 8: As attached Figure 1 , 2 As shown in , 3, it also includes a bracket 20, a left telescopic protective cover 21 and a right telescopic protective cover 22, two slide rails 1 are installed in the bracket 20, the left end and the right end of the left telescopic protective cover 21 are fixedly installed with the left part of the bracket 20 and the left side of the slide 3 respectively, and the left end and the right end of the right telescopic protective cover 22 are fixedly installed with the right side of the slide 3 and the right part of the bracket 20 respectively.

[0038] When in use, by providing a left telescopic protective cover 21 and a right telescopic protective cover 22 connected to the left and right parts of the pulley, the slide rail 1 and the rack 17 can be protected to prevent external impurities from entering, causing obstruction of operation and increased wear.

[0039] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

Claims

1. A device for accurately feeding thickened oil pipes, characterized in that It includes a slide rail, a slider and a pulley. The two slide rails spaced apart at a front and a rear are equipped with sliders. The pulley is fixedly installed on the upper side of the slider. The pulley includes a slide plate, a tube clamping head mechanism and a driving mechanism. The slide plate is provided with a tube clamping head mechanism and a driving mechanism that can drive the slider to move to a specified position on the slide rail.

2. The device for accurately feeding thickened oil pipe according to claim 1 is characterized in that The clamping head mechanism includes a supporting assembly and a first clamping assembly, the supporting assembly includes a first supporting frame, a second supporting frame, and a third supporting frame. Two first supporting frames are fixedly installed at intervals on the upper side of the slide board, and the second supporting frames are installed on the upper left and right sides of the two first supporting frames. The third supporting frames are fixedly installed on the upper sides of the two second supporting frames located on the left and the two second supporting frames located on the right. The first clamping assembly includes a cylinder, a supporting plate, a front clamping head and a rear clamping head. A cylinder installed on the lower side of the first supporting frame is provided between the second supporting frames on the left and right sides, a supporting plate is installed on the protruding end of the cylinder located at the upper end of the cylinder, and a front clamping head and a rear clamping head in the shape of ">" are provided on the upper side of the supporting plate. The middle parts of the front clamping head and the rear clamping head are hinged together by a rotating shaft, and the left and right ends of the rotating shaft are installed in the bearing seat, and the two bearing seats located on the left and right sides are fixedly installed on the upper sides of the two third supporting frames respectively.

3. The device for accurately feeding thickened oil pipe according to claim 2 is characterized in that The clamping head mechanism also includes a second clamping head assembly, which is located between two bearing seats. The second clamping head assembly has the same structure as the first clamping head assembly but different clamping tube sizes. The rotating shaft of the first clamping head assembly and the rotating shaft of the second clamping head assembly are integrally arranged.

4. The thickened oil pipe precise feeding device according to claim 2 or 3, characterized in that The lower ends of the front chuck and the rear chuck are both equipped with bearings.

5. The device for accurately feeding thickened oil pipe according to claim 1, 2 or 3, characterized in that The driving mechanism includes a servo motor, a reducer, a gear and a rack. A rack is fixedly installed between the two slide rails. The servo motor is transmission-connected to the reducer. The output end of the reducer is transmission-connected to a gear shaft. The gear shaft passes through the slide, and the gear is transmission-connected to the rack.

6. The device for accurately feeding thickened oil pipe according to claim 4, characterized in that The driving mechanism includes a servo motor, a reducer, a gear and a rack. A rack is fixedly installed between the two slide rails. The servo motor is transmission-connected to the reducer. The output end of the reducer is transmission-connected to a gear shaft. The gear shaft passes through the slide, and the gear is transmission-connected to the rack.

7. The device for accurately feeding thickened oil pipe according to claim 5, characterized in that It also includes a controller, a solenoid valve and a position sensor. The solenoid valve is provided on the air control pipeline of the cylinder. A position sensor for monitoring the position of the support plate is provided on the second support frame corresponding to the position of the support plate. The servo motor, the solenoid valve and the position sensor are respectively connected to the controller; or / and, it also includes a normally closed photoelectric switch in the limit position. A normally closed photoelectric switch in the limit position is provided between the two slide rails corresponding to the left and right end positions of the slide rail. The normally closed photoelectric switch in the limit position is connected to the controller.

8. The device for accurately feeding thickened oil pipe according to claim 6, characterized in that It also includes a controller, a solenoid valve and a position sensor. The solenoid valve is provided on the air control pipeline of the cylinder. A position sensor for monitoring the position of the support plate is provided on the second support frame corresponding to the position of the support plate. The servo motor, the solenoid valve and the position sensor are respectively connected to the controller; or / and, it also includes a normally closed photoelectric switch in the limit position. A normally closed photoelectric switch in the limit position is provided between the two slide rails corresponding to the left and right end positions of the slide rail. The normally closed photoelectric switch in the limit position is connected to the controller.

9. The device for accurately feeding thickened oil pipe according to claim 1, 2, 3, 6, 7 or 8, characterized in that It also includes a bracket, a left telescopic protective cover and a right telescopic protective cover. Two slide rails are installed in the bracket. The left end and the right end of the left telescopic protective cover are respectively fixed to the left part of the bracket and the left side of the slide board. The left end and the right end of the right telescopic protective cover are respectively fixed to the right side of the slide board and the right part of the bracket.

10. The device for accurately feeding thickened oil pipe according to claim 5, characterized in that It also includes a bracket, a left telescopic protective cover and a right telescopic protective cover. Two slide rails are installed in the bracket. The left end and the right end of the left telescopic protective cover are respectively fixed to the left part of the bracket and the left side of the slide board. The left end and the right end of the right telescopic protective cover are respectively fixed to the right side of the slide board and the right part of the bracket.

Images