Steel pipe oxide skin collecting device

Abstract

The utility model discloses a steel pipe oxide skin collecting device which is used for collecting oxide skin blown out of a steel pipe and comprises a mounting frame, an air pipe, a movable driving mechanism, an air suction cover and an air cylinder. The steel pipe extends in the front-back direction and is borne on racks which are sequentially arranged at intervals in the front-back direction, the air pipe is slidably connected to the mounting frame in the front-back direction and used for being connected with a negative pressure source, and the movement driving mechanism is connected with the air pipe and used for driving the air pipe to move in the front-back direction. The air suction cover is provided with an air inlet and a communication port, is rotationally connected to the lower end part of the air pipe, and is provided with a working position for forwards rotating in place, a lifting position for backwards rotating in place and a drooping position in the rotating process. The air suction cover can be rotated to be lifted upwards so as to avoid collision and interference between the air suction cover and the rack when the air suction cover moves front and back, the position of the air suction cover can be adjusted conveniently and rapidly, the efficiency of adjusting the position of the air suction cover is improved, and time is saved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of steel pipe oxide skin collecting devices. BACKGROUND

[0002] Currently, oxide skin inside steel pipe needs to be removed in steel pipe processing process, and the removal method commonly used in the industry is gas blowing removal, for example, the Chinese patent with announcement number CN213040913U uses the method of blowing gas into steel pipe to blow out and remove oxide skin in steel pipe. In some production workshops, steel pipes are usually carried on multiple parallel arranged racks. In order to prevent the blown oxide skin from scattering in the workshop and affecting the workshop environment, an air suction hood and a wind pipe are usually arranged at the gas outlet end of the steel pipe. The air suction hood is connected to the lower end of the wind pipe. The oxide skin blown out of the steel pipe is sucked into the air suction hood and the wind pipe under the action of negative pressure suction for collection.

[0003] When removing oxide skin from steel pipes of different lengths, the wind pipe and the air suction hood need to be moved forward and backward to adjust the position of the air suction hood to adapt to the length of the steel pipe. However, due to the low position of the air suction hood, the air suction hood may collide with the rack during forward and backward movement. Therefore, the air suction hood needs to be detached from the wind pipe, and then the wind pipe is moved forward and backward to the appropriate position before the air suction hood is reinstalled on the wind pipe. Detaching and installing the air suction hood is very troublesome, time-consuming and labor-intensive, making it very inconvenient to adjust the position of the air suction hood, affecting the efficiency of adjustment and wasting time. SUMMARY

[0004] The technical problem to be solved by the utility model is to overcome the defects of the prior art and provide a steel pipe oxide skin collecting device that can rotate the air suction hood upward to avoid collision and interference with the rack during forward and backward movement, thereby conveniently and quickly adjusting the position of the air suction hood, improving the efficiency of adjusting the position of the air suction hood and saving time.

[0005] To solve the above technical problems, the technical scheme of the utility model is as follows: a steel pipe oxide skin collecting device is used to collect oxide skin blown out of a steel pipe. It comprises a mounting frame, a wind pipe, a moving drive mechanism, an air suction hood and a gas cylinder.

[0006] The steel pipe extends in the front-rear direction and is carried on multiple racks arranged in the front-rear direction.

[0007] The wind pipe is slidably connected to the mounting frame in the front-rear direction and is used to connect a negative pressure source.

[0008] The moving drive mechanism is connected to the wind pipe and is used to drive the wind pipe to move in the front-rear direction.

[0009] The suction hood has an air inlet and a communication port, the suction hood is rotationally connected to the lower end of the air pipe and has a working position of forward rotation, a lifting position of backward rotation and a drooping position between the working position and the lifting position during rotation, when the suction hood is in the working position, the communication port of the suction hood is in communication with the lower end of the air pipe and the air inlet of the suction hood is aligned with the rear end of the steel pipe and the lower end of the suction hood is lower than the upper end surface of the rack, when the suction hood is in the drooping position, the lower end of the suction hood is lower than the upper end surface of the rack, when the suction hood is in the lifting position, the suction hood is higher than the upper end surface of the rack.

[0010] One end of the air cylinder is hinged to the air pipe and the other end of the air cylinder is hinged to the suction hood, the air cylinder is used to drive the suction hood to rotate forward to the working position and to drive the suction hood to rotate backward to the lifting position, and the air cylinder is also used to make the suction hood naturally droop to the drooping position when pressure is released.

[0011] Further, the steel pipe oxide skin collecting device further comprises an electromagnetic valve connected to the air cylinder and used to control the extension and retraction of the air cylinder and the pressure release by controlling the flow of gas.

[0012] Further, the electromagnetic valve is a three-position five-way electromagnetic valve.

[0013] Further, the suction hood has a first transition position between the drooping position and the working position and a second transition position between the drooping position and the lifting position when rotating relative to the air pipe.

[0014] The moving driving mechanism is used to drive the air pipe to move backward when the suction hood naturally droops, thereby driving the naturally drooping suction hood to move backward to abut against the rear rack and to be rotated forward by the rear rack to the first transition position.

[0015] The moving driving mechanism is used to drive the air pipe to move forward when the suction hood naturally droops, thereby driving the naturally drooping suction hood to move forward to abut against the front rack and to be rotated backward by the front rack to the second transition position.

[0016] Further, the steel pipe oxide skin collecting device further comprises a first sensor, a second sensor and a controller.

[0017] The first sensor is connected to the air pipe and used to send a first signal to the controller when detecting that the suction hood rotates from the drooping position to the first transition position.

[0018] The second sensor is connected to the air duct and used to send a second signal to the controller when detecting that the suction hood is rotated from the sag position to the second transition position;

[0019] The controller is connected to the electromagnetic valve, and the controller is used to control the electromagnetic valve to drive the air cylinder to contract and drive the suction hood to rotate from the first transition position to the working position when receiving the first signal, and the controller is also used to control the electromagnetic valve to drive the air cylinder to contract and drive the suction hood to rotate from the second transition position to the lifting position when receiving the second signal.

[0020] Further, the first sensor is connected to the front end of the air duct, and the second sensor is connected to the rear end of the air duct.

[0021] Further, the first sensor and the second sensor are both proximity switches.

[0022] Further, a first buffer block is connected to the suction hood, and the first buffer block is used to abut against the rack in front of the suction hood when the naturally sagging suction hood moves backward with the air duct.

[0023] Further, a second buffer block is connected to the suction hood, and the second buffer block is used to abut against the rack behind the suction hood when the naturally sagging suction hood moves forward with the air duct.

[0024] Further, the movement driving mechanism comprises:

[0025] A rack connected to the mounting frame;

[0026] A driving motor connected to the air duct;

[0027] A gear connected to the driving motor and engaged with the rack.

[0028] The above technical scheme is adopted, the front end of the steel pipe is provided with a blowing pipe, the blowing pipe is used for blowing gas into the steel pipe from the front end of the steel pipe to blow the oxide skin in the steel pipe from the rear end of the steel pipe. When the suction hood is in the working position, the lower end of the suction hood is lower than the upper end surface of the rack, so the suction hood will interfere with the collision when moving forward and backward, when the suction hood is in the lifting position, the suction hood is higher than the upper end surface of the rack, so the suction hood will not interfere with the collision when moving forward and backward. The suction hood and the air pipe are rotatably connected at shaft A, one end of the air cylinder is hingedly connected with the air pipe at shaft B, the other end of the air cylinder is hingedly connected with the suction hood at shaft C. When the length of the steel pipe that needs to be cleaned changes, the position of the suction hood needs to be adjusted in the forward and backward directions to adapt to the length of the steel pipe. At this time, the suction hood is in the working position, first extend the air cylinder to drive the suction hood to rotate backward, then release the pressure of the air cylinder to make the suction hood naturally sag, then the moving drive mechanism drives the air pipe to move forward, and then drives the naturally sagging suction hood to move forward. Since the lower end of the suction hood is lower than the upper end surface of the rack at this time, when the naturally sagging suction hood moves forward to the front rack, it will be pushed backward by the front rack. When the suction hood rotates to the position where the fulcrum A is in front of the BC line, the air cylinder is ventilated and retracted, and then the suction hood can be rotated backward to the lifting position. At this time, the position of the suction hood is lifted and will not interfere with the collision with the rack. Then the moving drive mechanism drives the air pipe to move forward or backward, and then drives the suction hood to move in the forward and backward directions to the position, then the air cylinder is extended and drives the suction hood to rotate forward, then the air cylinder is released to make the suction hood naturally sag, then the moving drive mechanism drives the air pipe to move backward, and then drives the naturally sagging suction hood to move backward. When the naturally sagging suction hood moves backward to the rear rack, it will be pushed forward by the rear rack. When the suction hood rotates to the position where the fulcrum A is behind the BC line, the air cylinder is ventilated and retracted, and then the suction hood can be rotated forward to the working position. When the suction hood is in the working position, the communication port of the suction hood is connected and communicated with the lower end of the air pipe, and the air inlet of the suction hood is aligned with the rear end of the steel pipe. Then the moving drive mechanism drives the air pipe to move forward, and then drives the suction hood to move forward to keep a proper distance from the rear end of the steel pipe. At this time, the oxide skin blown from the rear end of the steel pipe will be sucked into the suction hood under the action of negative pressure suction, and then into the air pipe. Therefore, when the length of the steel pipe changes and the position of the suction hood needs to be adjusted, the suction hood can be driven to rotate backward to the lifting position to lift the suction hood upward, thereby avoiding the collision and interference of the suction hood with the rack when moving forward and backward, thereby avoiding disassembling the suction hood, and conveniently and quickly adjusting the position of the suction hood, improving the efficiency of adjusting the position of the suction hood, and saving time. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 A structure schematic view of the steel pipe oxide skin collecting device of the utility model;

[0030] Figure 2 A structure schematic view of the suction hood when located at the working position;

[0031] Figure 3 A structure schematic view of the suction hood when located at the lifting position;

[0032] Figure 4 A structure schematic view of the suction hood when located at the drooping position;

[0033] Figure 5 A structure schematic view of the suction hood when located at the second transition position;

[0034] Figure 6 A structure schematic view of the suction hood when located at the first transition position. DETAILED DESCRIPTION

[0035] In order to make the content of the utility model more easily and clearly understood, the utility model is further explained in detail below according to specific embodiments and in conjunction with the drawings.

[0036] As shown in Figures 1-6 A steel pipe oxide skin collecting device for collecting oxide skin blown out from a steel pipe 1, which comprises a mounting frame 2, an air pipe 3, a moving drive mechanism, a suction hood 4 and a gas cylinder 5;

[0037] The steel pipe 1 extends along the front-rear direction and is carried on a plurality of bays 6 arranged along the front-rear direction in sequence at intervals;

[0038] The air pipe 3 is slidingly connected to the mounting frame 2 along the front-rear direction and is used for connecting a negative pressure source;

[0039] The moving drive mechanism is connected to the air pipe 3 and is used for driving the air pipe 3 to move along the front-rear direction;

[0040] The suction hood 4 has an air inlet 7 and a communication port 8, is rotatably connected to the lower end of the air duct 3 and has a working position rotated forward to place, a lifting position rotated backward to place and a drooping position between the working position and the lifting position during rotation, the communication port 8 of the suction hood 4 is in communication with the lower end of the air duct 3 and the air inlet 7 of the suction hood 4 is aligned with the rear end of the steel pipe 1 when the suction hood 4 is in the working position, the lower end of the suction hood 4 is lower than the upper end surface of the rack 6, the lower end of the suction hood 4 is lower than the upper end surface of the rack 6 when the suction hood 4 is in the drooping position, the suction hood 4 is higher than the upper end surface of the rack 6 when the suction hood 4 is in the lifting position;

[0041] One end of the air cylinder 5 is hinged to the air duct 3 and the other end of the air cylinder 5 is hinged to the suction hood 4, the air cylinder 5 is used to drive the suction hood 4 to rotate forward to the working position and to drive the suction hood 4 to rotate backward to the lifting position, and the air cylinder 5 is also used to make the suction hood 4 naturally droop to the drooping position when pressure is released.

[0042] Specifically, a blowing pipe 9 is arranged at the front end of the steel pipe 1, and the blowing pipe 9 is used to blow air into the steel pipe 1 from the front end of the steel pipe 1 to blow the oxide scale in the steel pipe 1 out from the rear end of the steel pipe 1. When the suction hood 4 is in the working position, the lower end of the suction hood 4 is lower than the upper end surface of the rack 6, and thus the suction hood 4 will interfere with and collide with the rack 6 when the suction hood 4 moves forward and backward. When the suction hood 4 is in the lifted position, the suction hood 4 is higher than the upper end surface of the rack 6, and thus the suction hood 4 will not interfere with and collide with the rack 6 when the suction hood 4 moves forward and backward. The suction hood 4 is rotatably connected with the air pipe 3 at the shaft A, one end of the air cylinder 5 is hingedly connected with the air pipe 3 at the shaft B, and the other end of the air cylinder 5 is hingedly connected with the suction hood 4 at the shaft C. When the length of the steel pipe 1 that needs to be cleaned changes, the position of the suction hood 4 needs to be adjusted in the forward and backward directions to adapt to the length of the steel pipe 1. At this time, the suction hood 4 is in the working position, first, the air cylinder 5 is extended to drive the suction hood 4 to rotate backward, then the air cylinder 5 is depressurized to make the suction hood 4 naturally sag, then the moving driving mechanism drives the air pipe 3 to move forward, and thus drives the naturally sagging suction hood 4 to move forward. Since at this time the lower end of the suction hood 4 is lower than the upper end surface of the rack 6, when the naturally sagging suction hood 4 moves forward to abut against the rack 6 in front, the naturally sagging suction hood 4 will be pushed backward by the rack 6 in front. When the suction hood 4 rotates to the position where the fulcrum A is located in front of the BC line, the air cylinder 5 is ventilated and retracted, and thus the suction hood 4 can be driven to rotate backward to the lifted position. At this time, the position of the suction hood 4 is lifted and will not interfere with and collide with the rack 6. Then the moving driving mechanism drives the air pipe 3 to move forward or backward, and thus drives the suction hood 4 to move in place in the forward and backward directions. Then the air cylinder 5 is extended to drive the suction hood 4 to rotate forward, and then the air cylinder 5 is depressurized to make the suction hood 4 naturally sag. Then the moving driving mechanism drives the air pipe 3 to move backward, and thus drives the naturally sagging suction hood 4 to move backward. When the naturally sagging suction hood 4 moves backward to abut against the rack 6 behind, the naturally sagging suction hood 4 will be pushed forward by the rack 6 behind. When the suction hood 4 rotates to the position where the fulcrum A is located behind the BC line, the air cylinder 5 is ventilated and retracted, and thus the suction hood 4 can be driven to rotate forward to the working position. When the suction hood 4 is in the working position, the communication port 8 of the suction hood 4 is in butt joint communication with the lower end of the air pipe 3, and the air inlet 7 of the suction hood 4 is aligned with the rear end of the steel pipe 1. Then the moving driving mechanism drives the air pipe 3 to move forward, and thus drives the suction hood 4 to move forward to keep a proper distance from the rear end of the steel pipe 1. At this time, the oxide scale blown out from the rear end of the steel pipe 1 will be sucked into the suction hood 4 under the action of the negative pressure suction, and thus be sucked into the air pipe 3.Therefore, when the length of the steel pipe 1 changes and the position of the suction hood 4 needs to be adjusted, the suction hood 4 can be driven to rotate backward to the lifting position to lift the suction hood 4 upward, thereby avoiding the collision and interference of the suction hood 4 with the rack 6 when the suction hood 4 moves forward and backward, and thereby not needing to disassemble the suction hood 4, the position of the suction hood 4 can be conveniently and quickly adjusted, the efficiency of adjusting the position of the suction hood 4 is improved, and time is saved. In the embodiment, the suction hood 4 can be rotatably connected to the lower end of the air pipe 3 through a hinge.

[0043] As shown in Figure 4 The steel pipe oxide skin collecting device can further include an electromagnetic valve 10 connected to the air cylinder 5 and used for controlling the extension and retraction of the air cylinder 5 and pressure relief by controlling the flow of gas; in the embodiment, the electromagnetic valve 10 can be a three-position five-way electromagnetic valve.

[0044] As shown in Figures 1-6 The suction hood 4 further has a first transition position between the drooping position and the working position and a second transition position between the drooping position and the lifting position when rotating relative to the air pipe 3;

[0045] The movement driving mechanism is used for driving the air pipe 3 to move backward when the suction hood 4 naturally droops, thereby driving the naturally drooping suction hood 4 to move backward to abut against the rear rack 6, and thereby driving the suction hood 4 to rotate to the first transition position through the rear rack 6;

[0046] The movement driving mechanism is used for driving the air pipe 3 to move forward when the suction hood 4 naturally droops, thereby driving the naturally drooping suction hood 4 to move forward to abut against the front rack 6, and thereby driving the suction hood 4 to rotate to the second transition position through the front rack 6; specifically, the fulcrum A is located behind the BC line in the first transition position, and the fulcrum A is located in front of the BC line in the second transition position.

[0047] As shown in Figures 1-6 The steel pipe oxide skin collecting device can further include a first sensor 11, a second sensor 12, and a controller;

[0048] The first sensor 11 is connected to the air pipe 3 and is used for sending a first signal to the controller when detecting that the suction hood 4 rotates from the drooping position to the first transition position;

[0049] The second sensor 12 is connected to the air pipe 3 and is used for sending a second signal to the controller when detecting that the suction hood 4 rotates from the drooping position to the second transition position;

[0050] The controller is connected to the solenoid valve 10. When the controller receives the first signal, it controls the solenoid valve 10 to operate, thereby controlling the cylinder 5 to vent and contract to drive the suction hood 4 to rotate from the first transition position to the working position. The controller is also used to control the solenoid valve 10 to operate when it receives the second signal, thereby controlling the cylinder 5 to vent and contract to drive the suction hood 4 to rotate from the second transition position to the raised position.

[0051] Specifically, the first sensor 11 is connected to the front end of the air duct 3, and the second sensor 12 is connected to the rear end of the air duct 3. Both the first sensor 11 and the second sensor 12 can be proximity switches.

[0052] like Figures 2-6 As shown, a first buffer block 13 is connected to the suction hood 4. The first buffer block 13 is used to abut against the platform 6 behind the suction hood 4 when the naturally drooping suction hood 4 moves backward with the air duct 3, thereby pushing and rotating the suction hood 4 forward to the first transition position through the platform 6 behind it.

[0053] like Figures 2-6 As shown, a second buffer block 14 is connected to the suction hood 4. The second buffer block 14 is used to abut against the platform 6 in front of the suction hood 4 when the naturally drooping suction hood 4 moves forward with the air duct 3, and then the platform 6 in front of the suction hood 4 pushes the suction hood 4 backward to the second transition position.

[0054] like Figure 1 As shown, the moving drive mechanism includes:

[0055] A rack 15 connected to the mounting bracket 2;

[0056] A drive motor 16 connected to the air duct 3;

[0057] A gear connected to the drive motor 16 and meshing with the rack 15.

[0058] Specifically, when the drive motor 16 drives the gear to rotate, it can drive the air duct 3 to slide back and forth on the mounting bracket 2 through the cooperation of the gear and rack 15.

[0059] In summary, the steel pipe 1 is provided with a blowing pipe 9 at the front end thereof, which is used to blow air into the steel pipe 1 from the front end of the steel pipe 1 to blow the oxide scale in the steel pipe 1 out from the rear end of the steel pipe 1. When the suction hood 4 is in the working position, the lower end of the suction hood 4 is lower than the upper end surface of the rack 6, so the suction hood 4 will interfere with and collide with the rack 6 when it moves forward and backward, and when the suction hood 4 is in the lifted position, the suction hood 4 is higher than the upper end surface of the rack 6, so the suction hood 4 will not interfere with and collide with the rack 6 when it moves forward and backward. The suction hood 4 is rotationally connected with the air pipe 3 at shaft A, one end of the air cylinder 5 is hingedly connected with the air pipe 3 at shaft B, and the other end of the air cylinder 5 is hingedly connected with the suction hood 4 at shaft C. When the length of the steel pipe 1 that needs to be cleaned of oxide scale changes, the position of the suction hood 4 needs to be adjusted in the forward and backward directions to adapt to the length of the steel pipe 1. At this time, the suction hood 4 is in the working position, first extend the air cylinder 5 to drive the suction hood 4 to rotate backward, then release the pressure of the air cylinder 5 to make the suction hood 4 naturally sag, then the moving driving mechanism drives the air pipe 3 to move forward, thereby driving the naturally sagging suction hood 4 to move forward. Since the lower end of the suction hood 4 is lower than the upper end surface of the rack 6 at this time, when the naturally sagging suction hood 4 moves forward to abut against the rack 6 in front, it will be pushed backward by the rack 6 in front. When the suction hood 4 rotates to the position where the fulcrum A is in front of the BC line, the air cylinder 5 is ventilated and retracted, thereby being able to drive the suction hood 4 to rotate backward to the lifted position. At this time, the position of the suction hood 4 is lifted and will not interfere with and collide with the rack 6. Then the moving driving mechanism drives the air pipe 3 to move forward or backward, thereby driving the suction hood 4 to move in place in the forward and backward directions. Then extend the air cylinder 5 to drive the suction hood 4 to rotate forward, then release the pressure of the air cylinder 5 to make the suction hood 4 naturally sag, then the moving driving mechanism drives the air pipe 3 to move backward, thereby driving the naturally sagging suction hood 4 to move backward. When the naturally sagging suction hood 4 moves backward to abut against the rack 6 behind, it will be pushed forward by the rack 6 behind. When the suction hood 4 rotates to the position where the fulcrum A is behind the BC line, the air cylinder 5 is ventilated and retracted, thereby being able to drive the suction hood 4 to rotate forward to the working position. When the suction hood 4 is in the working position, the communication port 8 of the suction hood 4 is in communication with the lower end of the air pipe 3, and the air inlet 7 of the suction hood 4 is aligned with the rear end of the steel pipe 1. Then the moving driving mechanism drives the air pipe 3 to move forward, thereby driving the suction hood 4 to move forward to keep a proper distance from the rear end of the steel pipe 1. At this time, the oxide scale blown out from the rear end of the steel pipe 1 will be sucked into the suction hood 4 under the action of negative pressure suction, and then into the air pipe 3.Therefore, when the length of the steel pipe 1 changes and the position of the suction hood 4 needs to be adjusted, the suction hood 4 can be driven to rotate rearward to a lifting position, so that the suction hood 4 is lifted upward, thereby avoiding collision and interference with the rack 6 when the suction hood 4 moves forward and backward, and thereby not needing to disassemble the suction hood 4, the position of the suction hood 4 can be conveniently and quickly adjusted, the efficiency of adjusting the position of the suction hood 4 is improved, and time is saved.

[0060] The above-described specific embodiments further specifically describe the technical problems, technical solutions and beneficial effects solved by the utility model, and it should be understood that the above-described specific embodiments are merely specific embodiments of the utility model and are not used to limit the utility model, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A steel pipe scale collecting device characterized by comprising: It is used for collecting the oxide skin blown from the steel pipe (1), and it comprises a mounting frame (2), an air pipe (3), a moving driving mechanism, a suction hood (4) and a gas cylinder (5); The steel pipe (1) extends along the front-rear direction and is carried on a plurality of racks (6) arranged in sequence along the front-rear direction; The air pipe (3) is slidingly connected to the mounting frame (2) along the front-rear direction and is used for connecting a negative pressure source; The moving driving mechanism is connected to the air pipe (3) and is used for driving the air pipe (3) to move along the front-rear direction; The suction hood (4) has an air inlet (7) and a communication port (8), the suction hood (4) is rotationally connected to the lower end of the air pipe (3) and has a working position of forward rotation to position, a lifting position of backward rotation to position and a drooping position between the working position and the lifting position during rotation, when the suction hood (4) is located at the working position, the communication port (8) of the suction hood (4) is in communication with the lower end of the air pipe (3) and the air inlet (7) of the suction hood (4) is aligned with the rear end of the steel pipe (1), and the lower end of the suction hood (4) is lower than the upper end surface of the rack (6), when the suction hood (4) is located at the drooping position, the lower end of the suction hood (4) is lower than the upper end surface of the rack (6), when the suction hood (4) is located at the lifting position, the suction hood (4) is higher than the upper end surface of the rack (6); One end of the gas cylinder (5) is hinged to the air pipe (3), the other end of the gas cylinder (5) is hinged to the suction hood (4), the gas cylinder (5) is used for driving the suction hood (4) to rotate forward to the working position and driving the suction hood (4) to rotate backward to the lifting position, and the gas cylinder (5) is also used for making the suction hood (4) naturally droop to the drooping position when pressure is released.

2. The steel pipe scale collecting device according to claim 1, characterized by An electromagnetic valve (10) is further included, the electromagnetic valve (10) is connected to the gas cylinder (5) and is used for controlling the flow of gas to control the extension and pressure release of the gas cylinder (5).

3. The steel pipe scale collecting device according to claim 2, characterized by The electromagnetic valve (10) is a three-position five-way electromagnetic valve (10).

4. The steel pipe oxide skin collecting device according to claim 2, wherein The suction hood (4) further has a first transition position between the drooping position and the working position and a second transition position between the drooping position and the lifting position when rotating relative to the air pipe (3); The moving driving mechanism is used for driving the air pipe (3) to move backward when the suction hood (4) naturally droops, thereby driving the naturally drooping suction hood (4) to move backward to abut against the rear rack (6) and then driving the suction hood (4) to rotate forward to the first transition position through the rear rack (6); The moving driving mechanism is used for driving the air pipe (3) to move forward when the suction hood (4) naturally droops, thereby driving the naturally drooping suction hood (4) to move forward to abut against the front rack (6) and then driving the suction hood (4) to rotate backward to the second transition position through the front rack (6).

5. The steel pipe scale collecting device according to claim 4, characterized by The first sensor (11), the second sensor (12) and the controller are further included. The first sensor (11) is connected to the air duct (3) and is configured to send a first signal to the controller when detecting that the suction hood (4) is rotated from the lowered position to the first transition position. The second sensor (12) is connected to the air duct (3) and is configured to send a second signal to the controller when detecting that the suction hood (4) is rotated from the lowered position to the second transition position. The controller is connected to the electromagnetic valve (10), and the controller is configured to control the electromagnetic valve (10) to act and in turn control the air cylinder (5) to deflate to drive the suction hood (4) to rotate from the first transition position to the working position when the first signal is received, and the controller is further configured to control the electromagnetic valve (10) to act and in turn control the air cylinder (5) to deflate to drive the suction hood (4) to rotate from the second transition position to the raised position when the second signal is received.

6. The steel pipe scale collecting device according to claim 5, characterized by The first sensor (11) is connected to the front end of the air duct (3), and the second sensor (12) is connected to the rear end of the air duct (3).

7. The steel pipe scale collecting device according to claim 5, characterized by The first sensor (11) and the second sensor (12) are both proximity switches.

8. The steel pipe scale collecting device according to claim 4, characterized by A first buffer block (13) is connected to the suction hood (4), and the first buffer block (13) is configured to abut against the gantry (6) behind the suction hood (4) when the naturally lowered suction hood (4) moves backward with the air duct (3).

9. The steel pipe scale collecting device according to claim 4, characterized by A second buffer block (14) is connected to the suction hood (4), and the second buffer block (14) is configured to abut against the gantry (6) in front of the suction hood (4) when the naturally lowered suction hood (4) moves forward with the air duct (3).

10. The steel pipe scale collecting device according to claim 1, characterized by The mobile driving mechanism comprises: A rack (15) connected to the mounting frame (2); A driving motor (16) connected to the air duct (3); A gear connected to the driving motor (16) and engaged with the rack (15).

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