CN111169945A

CN111169945A - Steel pipe blanking frame

Info

Publication number: CN111169945A
Application number: CN202010142282.4A
Authority: CN
Inventors: 严敏剑
Original assignee: Zhangjiagang Free Trade Zone Yaxin Auto Parts Co ltd
Current assignee: Zhangjiagang Free Trade Zone Yaxin Auto Parts Co ltd
Priority date: 2020-03-04
Filing date: 2020-03-04
Publication date: 2020-05-19

Abstract

The invention discloses a steel pipe blanking frame, wherein a conveying device is arranged on a frame, a material storage frame is arranged at the output end of the right side of the conveying device, a roll shaft is placed and supported on the right side of the lower section of the material storage frame through a bearing seat, a plurality of buffer structures are sequentially arranged on the material storage frame from front to back at intervals, and the buffer structures are as follows: a first pulley is arranged at the top of the left side of the storage rack, a second pulley is arranged at the top of the right side of the storage rack, a winding roller is fixedly arranged on a roller shaft, one end of a buffer belt is fixed on the storage rack below the first pulley, and the other end of the buffer belt is wound to the right side of the first pulley after passing through the top of the first pulley from the left side of the first pulley, then to the right side of the second pulley after passing through the top of the second pulley from the left side of the second pulley, and then to the winding roller; the roller shaft is driven by a third drive means. The buffer structure has a buffer effect on the falling steel pipe, so that damage or deformation caused by severe collision when the steel pipe falls is avoided, and the quality of the steel pipe is ensured.

Description

Steel pipe blanking frame

Technical Field

The invention relates to automatic blanking equipment for steel pipes subjected to heat treatment, in particular to a steel pipe blanking frame.

Background

The steel pipe is a hollow long-strip round steel material and is widely used in the fields of industrial conveying pipelines, mechanical structural parts and the like of petroleum, chemical engineering, medical treatment, food, machinery and the like. In the steel pipe production line, heat treatment is an essential process in the steel pipe production line, and the stress generated in the steel pipe cold drawing or finish rolling process is eliminated through a normalizing or annealing process so as to achieve the mechanical property required by customers. The existing conveying structure can not realize automatic blanking of the steel pipe after heat treatment, so that manual cooperation of operators is still needed, the degree of mechanization is low, the labor cost is high, and the labor intensity of the workers is high.

Disclosure of Invention

The technical problems to be solved by the invention are as follows: the steel pipe blanking frame can automatically convey steel pipes, is high in conveying efficiency and can protect the steel pipes, and can avoid the phenomena of deformation, damage and the like of the steel pipes due to severe collision when the steel pipes fall to the material storage frame.

In order to solve the problems, the invention adopts the technical scheme that: the steel pipe unloading frame include: the steel pipe conveying device comprises a rack, wherein a conveying device for conveying steel pipes is arranged on the rack, the right side of the conveying device is an output end, a storage rack is arranged at the output end of the right side of the conveying device, and the storage rack can receive the steel pipes output from the output end of the right side of the conveying device; the roller is placed around through the bearing frame and is supported in storage frame hypomere right side, by preceding to back interval in proper order on the storage frame and be provided with a plurality of buffer structure, buffer structure be: a first pulley is arranged at the top of the left side of the storage rack, a second pulley is arranged at the top of the right side of the storage rack, a winding roller is fixedly arranged on a roller shaft, one end of a buffer belt is fixed on the storage rack below the first pulley, and the other end of the buffer belt is wound to the right side of the first pulley after passing through the top of the first pulley from the left side of the first pulley, then to the right side of the second pulley after passing through the top of the second pulley from the left side of the second pulley, and then to the winding roller; the roll shaft is driven by the first driving device, and the buffer belt is wound on the winding roll under the driving of the first driving device, so that the length of the buffer belt between the first pulley and the second pulley is shortened or the buffer belt is released from the winding roll, so that the length of the buffer belt between the first pulley and the second pulley is increased.

Further, in the steel pipe blanking frame, the first driving device includes: the fixed speed reducer that sets up on the storage frame, the motor shaft and the screw rod fixed connection of speed reducer are provided with first sprocket in the fixed portion of screw rod tip, and the fixed second sprocket that is provided with on the roller axle, the chain twines on first sprocket and second sprocket, twines the roller rotation under the drive of speed reducer to make the buffer tape length between first pulley and the second pulley shorten or increase.

Further, in the steel pipe blanking frame, the screw rod is provided with the nut in a rotating manner, the storage frames at the front end and the rear end of the screw rod are respectively and fixedly provided with the proximity switches, the two proximity switches and the speed reducer are both connected with the controller, and the proximity switches are triggered when the nut moves to any one of the proximity switches.

Further, aforesaid steel pipe blanking frame, wherein, conveyor's structure is: a plurality of conveying rollers are sequentially arranged on the rack from front to back at intervals, each conveying roller is supported on the rack through a corresponding bearing seat, and the conveying rollers are parallel to each other; the second driving device drives each conveying roller to rotate around the axis of the second driving device through the first chain transmission, and the rotating speeds of the conveying rollers are synchronous, so that the steel pipes positioned on the conveying rollers are conveyed from front to back; at least one lifting frame is sequentially arranged on the rack from front to back at intervals, a plurality of second chain transmissions conveyed from left to right are sequentially arranged on each lifting frame from front to back at intervals, each second chain transmission is positioned between every two conveying rollers, driving chain wheels of each second chain transmission are all fixed on the same chain wheel shaft, and the chain wheel shaft is driven by a third driving device; the machine frame below each lifting frame is fixedly provided with two hydraulic cylinders, extension rods of the two hydraulic cylinders are fixedly connected with the corresponding lifting frame, and the extension rods of the two hydraulic cylinders extend upwards to enable the corresponding lifting frame to rise to the position, on the lifting frame, where the top of each second chain transmission is higher than the top of each conveying roller; the extension rods of the two hydraulic cylinders retract downwards, so that the corresponding lifting frame descends to the position that the tops of the second chain transmissions on the lifting frame are lower than the tops of the conveying rollers.

Further, in the steel pipe blanking frame, a first photoelectric switch is arranged at the front end of the frame, a second photoelectric switch is arranged at the rear end of the frame, the first photoelectric switch, the second photoelectric switch and the second driving device are all connected with the controller, and the controller can control the second driving device according to signals of the first photoelectric switch and the second photoelectric switch, so as to control the rotating speed of each conveying roller.

Further, the work or material rest under aforementioned steel pipe, wherein, all fixedly on the frame of every lifting frame below be provided with four synchronous elevating system, synchronous elevating system include: the lifting frame is fixed on the housing, the vertical rod penetrates through a through hole at the top of the housing and a through hole at the bottom of the housing in sequence and then is vertically inserted into the housing, the top end of the vertical rod extends out of the housing, and the bottom end of the vertical rod extends out of the housing and then is fixedly connected with the rack; a first vertical rack section and a second vertical rack section which are parallel to the axis of the vertical rod are respectively arranged on the circumference of the vertical rod, and the modulus of the first vertical rack section is the same as that of the second vertical rack section; the first connecting rod is horizontally arranged, the front end of the first connecting rod penetrates through a first through hole in the side wall of the housing and then extends into a cavity between the first vertical rack section and the side wall of the housing, and a first gear meshed with the first vertical rack section is fixedly arranged at the front end of the first connecting rod; the second connecting rod is horizontally arranged, the front end of the second connecting rod penetrates through a second through hole in the side wall of the housing and then extends into a cavity between the second vertical rack section and the side wall of the housing, and a second gear meshed with the second vertical rack section is fixedly arranged at the front end of the second connecting rod; the first gear can roll along the second vertical rack section when rolling along the first vertical rack section, and the second gear can roll along the first vertical rack section when rolling along the second vertical rack section.

further, the rack under aforementioned steel pipe, wherein, first vertical rack section and second vertical rack section both are and differ 90 angular position and distribute on the montant circumference, and at this moment, first connecting rod and second connecting rod both contained angles α are 90.

Further, the steel pipe blanking frame is provided with at least one lubricating oil filling opening at the top of the housing.

Further, in the steel pipe blanking frame, two lubricating oil filling ports are arranged at the top of the housing, and the two lubricating oil filling ports face the first gear and the second gear respectively.

the steel pipe conveying device has the advantages that the buffer structure has a buffer effect on a falling steel pipe, damage or deformation caused by severe collision of the falling steel pipe is avoided, the quality of the steel pipe is guaranteed, the ② controller can control the driving device according to signals of the first photoelectric switch and the second photoelectric switch, the rotating speed of each conveying roller is further controlled, low-speed forward conveying is achieved when the steel pipe does not completely enter the conveying device, quick forward conveying is achieved when the steel pipe completely enters the conveying device, conveying efficiency is improved, ③ when the steel pipe is completely conveyed to the rear portion of the conveying device, the top of each second chain transmission is higher than the top of each conveying roller through the lifting frame, the steel pipe is located on each second chain transmission, the steel pipe is output into the storage rack from left to right through the second driving device, the lifting frame is stably lifted horizontally without deflection due to the arrangement of the ④ synchronous lifting mechanism, the lifting process is not affected by factors such as uneven distribution of the steel pipe, and the use of the lifting frame is stable and reliable.

Drawings

Fig. 1 is a schematic structural diagram of a steel pipe blanking frame according to the present invention.

Fig. 2 is a schematic structural view of the lifting frame of fig. 1.

Fig. 3 is a partially enlarged schematic view of fig. 2.

Fig. 4 is a schematic structural diagram of the synchronous lifting mechanism.

Fig. 5 is a schematic view of the internal structure of fig. 4 with the cover removed.

Fig. 6 is a schematic view of the structure in the direction a in fig. 5.

Fig. 7 is a schematic diagram of the left-side view of fig. 6.

Fig. 8 is a schematic view of the structure in which the sprocket shaft is provided on the left side of the lifting frame.

Fig. 9 is an enlarged partial schematic view of the second chain drive tops of fig. 8 below the top of the feed rollers.

FIG. 10 is an enlarged fragmentary structural view of the second chain drive tops of FIG. 8 above the tops of the feed rollers.

Fig. 11 is a schematic view of the magazine in the bottom direction of fig. 1.

Fig. 12 is a schematic view of the buffer belt between the first pulley and the second pulley in the storage rack growing as the number of steel pipes increases.

Fig. 13 is a partial structural view in the right-hand direction of fig. 11.

Detailed Description

The technical solution of the present invention will be further described in detail with reference to the accompanying drawings and preferred embodiments.

As shown in fig. 1, the steel pipe blanking frame of this embodiment includes: the steel pipe conveying device comprises a frame 1, wherein a conveying device used for conveying a steel pipe 10 is arranged on the frame 1, the right side of the conveying device is an output end, a storage rack 6 is arranged at the output end of the right side of the conveying device, and the storage rack 6 can receive the steel pipe 10 output from the output end of the right side of the conveying device. As shown in fig. 1, 11 and 12, the roll shaft 70 is supported on the right side of the lower section of the storage rack 6 by being placed front and back through the bearing seat, a plurality of buffer structures 8 are sequentially arranged on the storage rack 6 from front to back at intervals, and the buffer structures 8 are: first pulley 81 sets up in storage frame 6 left side top through corresponding the supporting seat, and first pulley 81 can rotate around self axis, and second pulley 82 sets up in storage frame 6 right side top through corresponding the supporting seat, and second pulley 82 can rotate around self axis. The winding roller 7 is fixedly arranged on the roller shaft 70, one end of the buffer belt 83 is fixed on the storage rack 6 below the first pulley 81, and the other end of the buffer belt 83 winds around the top of the first pulley 81 from the left side of the first pulley 81, winds around the right side of the first pulley 81, winds around the top of the second pulley 82 from the left side of the second pulley 82, winds around the right side of the second pulley 82, and winds on the winding roller 7. The roller shaft 70 is driven by a first driving means, and the buffer tape 83 is wound around the wind-up roller 7 by the driving of the first driving means, so that the length of the buffer tape between the first pulley 81 and the second pulley 82 is shortened or the buffer tape 83 is released from the wind-up roller 7, so that the length of the buffer tape between the first pulley 81 and the second pulley 82 is increased.

The first driving device comprises: the speed reducer 9 is fixedly arranged on the storage frame 6, a motor shaft of the speed reducer 9 is fixedly connected with the screw rod 90, the screw rod 90 is supported on the storage frame 6 through a corresponding bearing seat, a first chain wheel 91 is fixedly arranged at the end part of the screw rod 90, a second chain wheel 92 is fixedly arranged on the roller shaft 70, a chain is wound on the first chain wheel 91 and the second chain wheel 92, and the winding roller 7 rotates under the driving of the speed reducer 9, so that the length of a buffer belt between the first pulley 81 and the second pulley 82 is shortened or increased.

As shown in fig. 13, in this embodiment, a nut 93 is further screwed on the screw 90, proximity switches are respectively and fixedly disposed on the storage rack 6 below the front and rear ends of the screw 90, the two proximity switches and the speed reducer 9 are both connected to the controller, and the nut 93 triggers the proximity switches when moving to any proximity switch. The controller can control the opening and closing of the speed reducer according to the signal of the proximity switch.

For convenience of description, the two proximity switches are respectively defined as a first proximity switch 94 and a second proximity switch 95, and assuming that the storage rack 6 is in the non-material-receiving state, the nut 93 is located on the screw 90 at the first proximity switch 94, and at this time, each buffer belt 83 is wound on the winding roller 7 and the length of the buffer belt between the first pulley 81 and the second pulley 82 is the shortest, as shown in fig. 11. When the steel pipes 10 are fed from the feeding device and slide onto the buffer belts 83, the speed reducer 9 drives the winding roller 7 to release the buffer belts 83 wound around the winding roller 7 as the number of the steel pipes 10 falling onto the buffer belts 83 increases, so that the length of the buffer belts between the first pulley 81 and the second pulley 82 gradually increases, as shown in fig. 12. When the speed reducer 9 drives the winding roller 7 to continuously release the buffer belt 83 wound on the winding roller 7, the nut 93 moves from the screw end of the first proximity switch 94 to the other end of the screw 90 along with the rotation of the screw 90, when the nut 93 moves to the second proximity switch 94, the second proximity switch 94 is triggered, the speed reducer stops working, and at the moment, the buffer belt between the first pulley 81 and the second pulley 82 is longest in length. Here, the controller may be connected to an alarm, and when the nut 93 moves to the second proximity switch 94, the second proximity switch 94 is triggered, so that the alarm operates to remind the worker to timely remove the steel tube 10 in the storage rack 6.

As shown in fig. 1, the structure of the conveying device described in this embodiment is: a plurality of conveying rollers 2 are sequentially arranged on the frame 1 from front to back at intervals, each conveying roller 2 is supported and arranged on the frame 1 through a corresponding bearing seat, and each conveying roller 2 is parallel to each other. In an actual setting, the intervals between the respective conveying rollers 2 are usually made equal. A driven sprocket forming a first chain transmission is fixedly arranged at one end of each conveying roller 2, each conveying roller 2 is driven by the second driving device to rotate around the axis of the second driving device through the first chain transmission, and the rotating speeds of the conveying rollers are synchronous, so that the steel pipes 10 positioned on the conveying rollers 2 are conveyed from front to back. Be provided with first photoelectric switch at 1 front end in frame, be provided with the second photoelectric switch at 1 rear end in frame, first photoelectric switch, second drive arrangement all are connected with the controller, and the controller can be according to the signal control second drive arrangement of first photoelectric switch, second photoelectric switch, and then control each conveying roller 2's rotational speed: when the steel pipes 10 do not completely enter the conveying device, low-speed forward conveying is achieved, and when the steel pipes 10 completely enter the conveying device, quick forward conveying is achieved, and conveying efficiency is improved. When the steel pipe 10 is conveyed to the rear part of the conveying device and reaches the second photoelectric switch, the second photoelectric switch sends a signal to the controller, and the controller controls the second driving device to stop, so that each conveying roller 2 is controlled to stop rotating, and the steel pipe 10 stops at the rear part of the conveying device. The second driving device can adopt a driving motor and can also adopt other driving structures.

As shown in fig. 1 and 2, at least one lifting frame 3 is arranged on the frame 1 at intervals from front to back, a plurality of second chain transmissions 4 for left-to-right conveying are arranged on each lifting frame 3 at intervals from front to back, each second chain transmission 4 is parallel to each conveying roller 2, each second chain transmission 4 is positioned between every two conveying rollers 2, a driving chain wheel 41 of each second chain transmission 4 is fixed on the same chain wheel shaft 40, the chain wheel shaft 40 is driven by a third driving device, and each second chain transmission is conveyed from left to right at the same conveying speed under the driving of the third driving device. The third driving device may adopt a driving motor 42, a first driving sprocket 43 is fixedly disposed on a motor shaft of the driving motor 42, a first driven sprocket 44 is fixedly disposed on a sprocket shaft 40, and a first chain is wound around the first driving sprocket 43 and the first driven sprocket 44. The drive sprocket 41 and sprocket shaft of each second chain drive 4 may be located on the right side of the lifting frame 3, as shown in fig. 2, which is a schematic view of the structure in which the drive sprocket 41 and sprocket shaft of each second chain drive 4 is located on the right side of the lifting frame 3. The drive sprocket 41 and sprocket shaft of each second chain drive 4 may also be located on the left side of the lifting frame, as shown in fig. 8, 9 and 10, which are schematic structural views of the drive sprocket 41 and sprocket shaft of each second chain drive 4 located on the left side of the lifting frame. Two hydraulic cylinders 30 are fixedly arranged on the machine frame below each lifting frame 3, extension rods of the two hydraulic cylinders 30 are fixedly connected with the corresponding lifting frame 3, and the extension rods of the two hydraulic cylinders 30 retract downwards to enable the tops of the second chain transmissions 4 to be lower than the tops of the conveying rollers 2; after the extending rods of the two hydraulic cylinders 30 extend upwards, the top of each second chain transmission 4 is higher than the top of each conveying roller 2, at the moment, the steel pipe 10 is positioned on each second chain transmission 4, and the steel pipe 10 is output out of the conveying device from left to right through a third driving device.

As shown in fig. 2, 3 and 4, four synchronous lifting mechanisms 5 are fixedly arranged on the frame 1 below each lifting frame 3, and each synchronous lifting mechanism 5 includes: the lifting frame 3 is fixed on the housing 51, the vertical rods 52 penetrate through the through holes in the top of the housing and the bottom of the housing in sequence and are vertically inserted into the housing 51, the top ends of the vertical rods 52 extend out of the housing 51, and the bottom ends of the vertical rods 52 extend out of the housing 51 and are fixedly connected with the rack 1. As shown in fig. 5, 6 and 7, a first vertical rack segment 521 parallel to the axis of the vertical rod and a second vertical rack segment 522 parallel to the axis of the vertical rod are respectively arranged on the circumference of the vertical rod 52, and the modules of the first vertical rack segment 521 and the second vertical rack segment 522 are the same. The first connecting rod 53 is horizontally arranged, the front end of the first connecting rod 53 penetrates through a first through hole in the side wall of the housing and then extends into a cavity between the first vertical rack segment 521 and the side wall of the housing, and a first gear 54 meshed with the first vertical rack segment 521 is fixedly arranged at the front end of the first connecting rod 53. The second connecting rod 55 is horizontally arranged, the front end of the second connecting rod 55 penetrates through a second through hole in the side wall of the housing and then extends into a cavity between the second vertical rack segment 522 and the side wall of the housing, and a second gear 56 meshed with the second vertical rack segment 522 is fixedly arranged at the front end of the second connecting rod 55. The first gear 54 can be driven to synchronously roll along the second vertical rack segment 522 when rolling along the first vertical rack segment 521, and similarly, the second gear 56 can be driven to synchronously roll along the first vertical rack segment 521 when rolling along the second vertical rack segment 522.

as shown in fig. 5 and 7, in the present embodiment, the first vertical rack segment 521 and the second vertical rack segment 522 are distributed on the circumference of the vertical rod at an angle different from 90 °, and at this time, the included angle α between the first connecting rod 53 and the second connecting rod 55 is 90 °.

At least one lubricating oil filling port 57 is provided at the top of the housing 51. As shown in fig. 4 and 5, the present embodiment is provided with two lubricating oil filling ports 57 at the top of the housing 51, and the two lubricating oil filling ports 57 face the first gear 54 and the second gear 56, respectively, to provide lubrication for the engagement of the first gear 54 and the first vertical rack segment 521 and the engagement of the second gear 56 and the second vertical rack segment 522.

When the lifting frame 3 is driven by the two hydraulic cylinders 30 to ascend and descend, the first gear 54 in each synchronous lifting mechanism can roll upwards along the first vertical rack segment 521, the second gear 56 can roll upwards along the second vertical rack segment 522, and because the first gear 54 can roll synchronously along the second vertical rack segment 522 when rolling along the first vertical rack segment 521, and similarly, the second gear 56 can roll synchronously along the first vertical rack segment 521 when rolling along the second vertical rack segment 522, the lifting frame 3 can be ensured to stably and horizontally ascend and descend without deflection, the lifting frame is not influenced by factors such as uneven distribution of the steel pipes 10 in the lifting process, and the lifting frame 3 is stable and reliable in use.

The working principle of the device is as follows:

when the steel pipes 10 are not all fed into the conveying device in the process of feeding the steel pipes 10 into the conveying device from the front end of the conveying device, the controller controls the driving device, and further controls the rotating speed of each conveying roller 2 to realize low-speed forward conveying. When the steel pipes 10 are all input into the conveying device and the end parts of the steel pipes leave the first photoelectric switch, the first photoelectric switch sends signals to the controller, and the controller controls the driving device, so that the rotating speed of each conveying roller 2 is controlled, and the steel pipes are conveyed forwards quickly. When the steel pipe 10 is conveyed to the rear part of the conveying device and reaches the second photoelectric switch, the second photoelectric switch sends a signal to the controller, and the controller controls the driving device to further control each conveying roller 2 to stop rotating, so that the steel pipe 10 stays at the rear part of the conveying device.

Then each hydraulic cylinder 30 is activated and the extension bar of each hydraulic cylinder 30 is extended upwards pushing the corresponding lifting frame 3 to rise to the top of each second chain drive 4 above the top of each conveyor roller 2. And then, starting the second driving device, conveying the steel pipes from left to right by the second chain drives 4 at the same conveying speed, and outputting the steel pipes 10 to the buffer belts 83 of the material storage rack 6 from left to right.

the steel pipe conveying device has the advantages that the ① buffer structure 8 has a ① buffer effect on a falling steel pipe 10, the steel pipe 10 is prevented from being damaged or deformed due to severe collision when falling, the quality of the steel pipe is guaranteed, the ② controller can control the second driving device according to signals of the first photoelectric switch and the second photoelectric switch, the rotating speed of each conveying roller is further controlled, low-speed forward conveying is achieved when the steel pipe 10 does not completely enter the conveying device, quick forward conveying is achieved when the steel pipe 10 completely enters the conveying device, conveying efficiency is improved, the top of each second chain transmission 4 is higher than the top of each conveying roller 2 when the lifting frame 3 ascends after the steel pipe 10 is completely conveyed to the rear portion of the conveying device, the steel pipe 10 is located on each second chain transmission 4 and is output into the material storage frame 6 from left to right through the third driving device, the synchronous lifting mechanism 5 enables the lifting frame 3 to stably and horizontally lift without deflection, the lifting frame 3 is not affected by uneven distribution of the steel pipe 10 and the like in the lifting process, and the lifting frame 3 is stable and reliable in use.

Claims

1. The steel pipe unloading frame includes: the frame, its characterized in that: a conveying device for conveying the steel pipes is arranged on the rack, the right side of the conveying device is an output end, a storage rack is arranged at the output end of the right side of the conveying device, and the storage rack can receive the steel pipes output from the output end of the right side of the conveying device; the roller is placed around through the bearing frame and is supported in storage frame hypomere right side, by preceding to back interval in proper order on the storage frame and be provided with a plurality of buffer structure, buffer structure be: a first pulley is arranged at the top of the left side of the storage rack, a second pulley is arranged at the top of the right side of the storage rack, a winding roller is fixedly arranged on a roller shaft, one end of a buffer belt is fixed on the storage rack below the first pulley, and the other end of the buffer belt is wound to the right side of the first pulley after passing through the top of the first pulley from the left side of the first pulley, then to the right side of the second pulley after passing through the top of the second pulley from the left side of the second pulley, and then to the winding roller; the roll shaft is driven by the first driving device, and the buffer belt is wound on the winding roll under the driving of the first driving device, so that the length of the buffer belt between the first pulley and the second pulley is shortened or the buffer belt is released from the winding roll, so that the length of the buffer belt between the first pulley and the second pulley is increased.

2. The steel pipe blanking frame of claim 1, wherein: the first driving device comprises: the fixed speed reducer that sets up on the storage frame, the motor shaft and the screw rod fixed connection of speed reducer are provided with first sprocket in the fixed portion of screw rod tip, and the fixed second sprocket that is provided with on the roller axle, the chain twines on first sprocket and second sprocket, twines the roller rotation under the drive of speed reducer to make the buffer tape length between first pulley and the second pulley shorten or increase.

3. The steel pipe blanking frame of claim 2, wherein: the screw rod is provided with a nut in a rotating mode, the storage racks at the front end and the rear end of the screw rod are respectively and fixedly provided with a proximity switch, the two proximity switches and the speed reducer are connected with the controller, and the proximity switches can be triggered when the nut moves to any proximity switch.

4. The steel pipe blanking frame of claim 1, 2 or 3, wherein: the structure of the conveying device is as follows: a plurality of conveying rollers are sequentially arranged on the rack from front to back at intervals, each conveying roller is supported on the rack through a corresponding bearing seat, and the conveying rollers are parallel to each other; the second driving device drives each conveying roller to rotate around the axis of the second driving device through the first chain transmission, and the rotating speeds of the conveying rollers are synchronous, so that the steel pipes positioned on the conveying rollers are conveyed from front to back; at least one lifting frame is sequentially arranged on the rack from front to back at intervals, a plurality of second chain transmissions conveyed from left to right are sequentially arranged on each lifting frame from front to back at intervals, each second chain transmission is positioned between every two conveying rollers, driving chain wheels of each second chain transmission are all fixed on the same chain wheel shaft, and the chain wheel shaft is driven by a third driving device; the machine frame below each lifting frame is fixedly provided with two hydraulic cylinders, extension rods of the two hydraulic cylinders are fixedly connected with the corresponding lifting frame, and the extension rods of the two hydraulic cylinders extend upwards to enable the corresponding lifting frame to rise to the position, on the lifting frame, where the top of each second chain transmission is higher than the top of each conveying roller; the extension rods of the two hydraulic cylinders retract downwards, so that the corresponding lifting frame descends to the position that the tops of the second chain transmissions on the lifting frame are lower than the tops of the conveying rollers.

5. The steel pipe blanking frame of claim 4, wherein: the first photoelectric switch is arranged at the front end of the rack, the second photoelectric switch is arranged at the rear end of the rack, the first photoelectric switch, the second photoelectric switch and the second driving device are all connected with the controller, and the controller can control the second driving device according to signals of the first photoelectric switch and the second photoelectric switch so as to control the rotating speed of each conveying roller.

6. The steel pipe blanking frame of claim 4, wherein: all fixedly in the frame of every lifting frame below be provided with four synchronous elevating system, synchronous elevating system include: the lifting frame is fixed on the housing, the vertical rod penetrates through a through hole at the top of the housing and a through hole at the bottom of the housing in sequence and then is vertically inserted into the housing, the top end of the vertical rod extends out of the housing, and the bottom end of the vertical rod extends out of the housing and then is fixedly connected with the rack; a first vertical rack section and a second vertical rack section which are parallel to the axis of the vertical rod are respectively arranged on the circumference of the vertical rod, and the modulus of the first vertical rack section is the same as that of the second vertical rack section; the first connecting rod is horizontally arranged, the front end of the first connecting rod penetrates through a first through hole in the side wall of the housing and then extends into a cavity between the first vertical rack section and the side wall of the housing, and a first gear meshed with the first vertical rack section is fixedly arranged at the front end of the first connecting rod; the second connecting rod is horizontally arranged, the front end of the second connecting rod penetrates through a second through hole in the side wall of the housing and then extends into a cavity between the second vertical rack section and the side wall of the housing, and a second gear meshed with the second vertical rack section is fixedly arranged at the front end of the second connecting rod; the first gear can roll along the second vertical rack section when rolling along the first vertical rack section, and the second gear can roll along the first vertical rack section when rolling along the second vertical rack section.

7. The steel pipe blanking frame of claim 6, wherein: the first vertical rack section and the second vertical rack section are distributed on the circumference of the vertical rod at the angle position with the difference of 90 degrees.

8. The steel pipe blanking frame of claim 6, wherein: at least one lubricating oil filling port is arranged at the top of the housing.

9. The steel pipe blanking frame of claim 8, wherein: two lubricating oil filling ports are arranged at the top of the housing, and the two lubricating oil filling ports respectively face the first gear and the second gear.