A steel square ventilation duct deformation correction device and correction method

Abstract

The present invention discloses a deformation correction device and a correction method for a steel square ventilation duct, which relates to the technical field of metal sheet correction. When the present invention rolls and walks, a negative pressure is generated inside the negative pressure suction cavity of the magnetic ring. Since the air inlet of the suction cup is sealed and fitted with the sunken surface of the duct, gas cannot enter to compensate for the negative pressure. Therefore, the negative pressure rapidly generated inside the negative pressure suction cavity can only be compensated by the displacement generated by the suction cup forcibly pulling up the sunken surface. Thus, when the negative pressure is generated, the positioning frame, the suction cup, and the sunken surface of the duct adsorbed by the suction cup will undergo a centripetal displacement together, and then an adsorption-type arching correction effect is produced on the sunken surface of the duct. Subsequently, the suction cup follows the rolling of the magnetic ring and moves away from the adsorption point to contact and seal. By this cycle, the effect of adaptively detecting surface depressions during walking and rapidly correcting depressions by using negative pressure is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of metal sheet calibration, and specifically to a deformation calibration device and calibration method for a steel square ventilation duct. Background Art

[0002] Square ventilation ducts are widely used in the construction field, especially in some large shopping malls, hotels, office buildings, hospitals, etc. As long as it is a high-rise building, ventilation ducts are indispensable. However, since ventilation ducts only need to be used for ventilation and do not need to bear rigid loads, ventilation ducts are generally composed of thin steel sheets.

[0003] The square ventilation duct made of thin steel sheets has the advantages of high resource utilization rate, low cost and convenient transportation. However, it also has the problem of being easily deformed by external factors (improper installation operation, transportation jolts, etc.), and most of them are concave deformations. For example, a deformation calibration device for a steel square ventilation duct for a high-rise building fresh air system with the publication number CN112474891A calibrates the outer side of the square ventilation duct by setting an outer calibration device, so that the deformed part of the outer side of the ventilation duct can be calibrated; and the side pressure roller can be driven to rotate through a pressure roller motor and a multi-axis right-angle converter to realize rolling pressing calibration of the deformed part of the outer side of the square ventilation duct, achieving calibration of the surface in the form of a rolling surface.

[0004] Although the above scheme achieves a good deformation calibration effect, there are still certain deficiencies from the perspective of practical application, specifically as follows:

[0005] This square ventilation duct deformation calibration device is suitable for fine calibration of the deformed sectional ventilation duct alone, and is also suitable for batch calibration of the ventilation duct before installation. However, for the ventilation duct that has deformed after installation, it is necessary to remove the ventilation duct one by one and perform calibration treatment in sections. There are many preparatory steps before calibration, which are time-consuming and laborious, and it also involves the docking and installation of the pipeline after calibration. In fact, the concave deformation of the ventilation duct mostly occurs during the installation of anchor fittings, suspension parts, etc., and there is also concave deformation caused by external collision after installation. The above scheme obviously cannot efficiently adapt to the calibration of the already installed square ventilation duct. Therefore, the present invention proposes a portable deformation calibration device for the steel square ventilation duct after installation;

[0006] In addition, since ventilation ducts are mostly installed indoors, due to space limitations, ventilation ducts generally need to be equipped with two 90-degree elbows that bend along the X-axis and bend along the Y-axis to achieve corner docking (bending along the X-axis and bending along the Y-axis respectively refer to horizontal bending and vertical bending in the actual installation of the ventilation duct). Therefore, this portable deformation calibration device also needs to be equally adapted to the calibration in the horizontal bending and vertical bending states in the actual installation of the square ventilation duct. Summary of the Invention

[0007] The technical solution of the present invention aims at the technical problem that the existing technical solutions are too single, and provides a solution significantly different from the existing technologies. Specifically, the purpose of the present invention is to provide a deformation correction device and a correction method for a steel square ventilation duct to solve the problem proposed in the above background technology that the concave deformation of the ventilation duct actually mostly occurs during the installation of anchor fittings, suspension parts, etc., and there is also concave deformation caused by external collisions after installation. And because the ventilation ducts are mostly installed indoors, due to space limitations, the ventilation ducts generally need to be equipped with two 90-degree elbows bent along the X-axis and the Y-axis to achieve corner docking, while the existing technical solutions obviously cannot efficiently adapt to the correction of the already installed square ventilation ducts.

[0008] To achieve the above object, the present invention provides the following technical solution: A deformation correction device for a steel square ventilation duct, including a support platform, and further including a manually controlled traction type walking control component arranged below the support platform, magnetic rings arranged at equal intervals along the X-axis and the Y-axis above the support platform, and suction cups distributed at equal angles inside the magnetic rings for correcting deformation by combining magnetic attraction and negative pressure suction;

[0009] Central shafts are installed at the central axes of the magnetic rings arranged at equal intervals along the X-axis and the Y-axis;

[0010] A lifting mechanism is installed between the magnetic rings arranged at equal intervals along the X-axis and the support platform;

[0011] The magnetic rings arranged at equal intervals along the Y-axis are vertically fixedly connected to the support platform through the central shafts.

[0012] Preferably, the lifting mechanism includes a rod seat vertically fixed on the upper surface of the support platform and having tooth blocks equally spaced on one side, a sliding sleeve sleeved outside the rod seat and fixedly connected to the central shaft of the magnetic ring distributed along the X-axis, a hand-cranked winch installed at the open end of the sliding sleeve and meshing with the tooth blocks on the side of the rod seat, and a support spring wound between the rod seat and the sliding sleeve to prevent the sliding sleeve from falling due to gravity.

[0013] Preferably, one end of the support spring is welded to the bottom of the rod seat, and the other end of the support spring is fixed to the lower end of the sliding sleeve.

[0014] Preferably, the traction type walking control component includes a pulling telescopic rod rotatably connected to the lower end of the support platform through a bearing, and an angle-adjusting telescopic rod rotatably connected to the lower surface of the support platform through a hinge assembly;

[0015] An L-shaped grip rod for facilitating the 90-degree turning of the correction device is arranged at the lower end of the pulling telescopic rod.

[0016] Preferably, fixing disks are arranged at equal intervals on the outer wall of the central shaft, and annular limiting grooves are formed on the surface of the fixing disk close to the magnetic ring;

[0017] Sliding balls are distributed at equal angles inside the annular limiting groove, and the ends of the sliding balls penetrate through the annular limiting groove and are fixed to the outer side wall of the magnetic ring.

[0018] Preferably, negative pressure suction cavities are provided at equal angles inside the magnetic ring, a piston plate is slidably arranged in a sealed manner inside the negative pressure suction cavity, and one end of the piston plate penetrates through the central channel of the magnetic ring.

[0019] Preferably, one end of an adjustment rod is hinged to the outer end of the piston plate located in the central channel of the magnetic ring, an adjustment groove is provided on the outer surface of the fixed disk close to one side of the magnetic ring, and the other end of the adjustment rod is slidably arranged inside the adjustment groove;

[0020] The adjustment groove is composed of two parts: symmetrically arranged centripetal arch grooves and symmetrically arranged concentric grooves.

[0021] Preferably, a positioning frame is slidably arranged through the end of the negative pressure suction cavity far from the piston plate;

[0022] The positioning frame is made of metal and maintains a magnetically attracted state with the magnetic ring that can be slid under force.

[0023] Preferably, the T-shaped through-type sleeve-shaped hard end of the suction cup is slidably arranged in a clamping manner in the through groove of the positioning frame;

[0024] The outer end of the suction cup located outside the positioning frame is made of a flexible material, and a return spring is wound between the hard inner end of the suction cup and the positioning frame;

[0025] One end of the return spring is welded to the hard inner end of the suction cup, and the other end of the return spring is fixed to the inner wall of the through groove of the positioning frame.

[0026] A method for deforming and correcting a steel square ventilation duct, the correction method comprising the following steps:

[0027] S1: Place a number of sets of magnetic rings in a horizontal and vertical combination with adjusted states on the square ventilation duct, so that a number of sets of magnetic rings arranged at equal intervals along the X-axis and a number of sets of magnetic rings arranged at equal intervals along the Y-axis are respectively in corresponding contact with the upper surface and one side of the square ventilation duct. Then, manually adjust the pulling telescopic rod and the angle-adjusting telescopic rod to a more appropriate length, and then pull the whole device through the pulling telescopic rod to walk in a contact manner on the upper surface and the side of the square ventilation duct, and use the magnetic attraction of the magnetic ring and the negative pressure adsorption effect of the suction cup on the side of the magnetic ring to realize the arching correction of the sunken surface;

[0028] S2: Place several groups of horizontally and vertically combined magnetic rings in the adjusted state on the square ventilation duct, so that several groups of magnetic rings arranged at equal intervals along the X-axis are in contact with the lower surface of the square ventilation duct, and several groups of magnetic rings arranged at equal intervals along the Y-axis are in contact with the other side of the square ventilation duct. Then manually adjust the traction telescopic rod and the angle-adjusting telescopic rod to a more appropriate length, and use the magnetic attraction of the magnetic rings and the negative pressure adsorption of the suction cups on the side of the magnetic rings to realize the arch correction of the lower surface and the other side of the square ventilation duct, so as to realize the convenient correction of the four sides of the steel square ventilation duct. At the same time, it can also support the synchronous correction of two 90-degree connecting elbows bent along the X-axis and the Y-axis.

[0029] Compared with the prior art, the beneficial effects of the present invention are:

[0030] First, during the rolling movement of several groups of magnetic rings along the outer surface of the pipeline, when the suction cup does not contact the pipeline surface, it will maintain a convex state exceeding the outer diameter of the magnetic ring. As the rolling progresses, the suction cup will gradually contact the sunken surface of the pipeline and slide along the inner wall of the positioning frame under the extrusion of the pipeline surface and stretch the return spring, so that the suction cup smoothly enters the notch outside the magnetic ring. The outer wall of the suction cup and the steel plate will maintain a state of fitting and adsorption. During this period, since the fixed plate will not rotate with the suction cup, the distance-adjusting rod corresponding to the suction cup will also fall into the near-center arch groove of the distance-adjusting groove. At this time, due to the rapid shortening of the centrifugal distance of the distance-adjusting rod, the piston plate connected to the distance-adjusting rod will also move adaptively towards the center synchronously, so that negative pressure is generated inside the negative pressure suction cavity. Since the air inlet of the suction cup is hermetically fitted with the sunken surface of the pipeline and gas cannot enter to compensate for the negative pressure, the negative pressure rapidly generated inside the negative pressure suction cavity can only be compensated by the displacement generated by the suction cup forcibly pulling up the sunken surface. Therefore, when the negative pressure is generated, the positioning frame, the suction cup, and the sunken surface of the pipeline adsorbed by the suction cup will move towards the center together, thereby generating an adsorption-type arch correction effect on the sunken surface of the pipeline. Subsequently, the suction cup follows the rolling of the magnetic ring away from the adsorption point to contact the adsorption seal, and this cycle realizes the effect of self-adaptively detecting surface depressions during walking and quickly correcting depressions by using negative pressure;

[0031] Second, since the magnetic rings are connected by the fixed disk, several equally spaced magnetic rings can be regarded as a roller fitting on a smooth surface. Although the square duct is composed of four thin steel plates, at the corners, two thin steel plates are stacked and mutually perpendicular and abutted. Therefore, the four corners of the square duct have good pressure-bearing capacity and generally do not undergo concave deformation. Thus, the "roller" resting on the corners of the square duct can be understood as always maintaining a horizontal posture with the standard surface. When the "roller" with magnetism rolls on the smooth surface with concave deformation, it will generate a certain adsorption force on the concave part, which helps to arch and correct the concave deformation and, combined with the negative pressure adsorption correction method in Effect One, can achieve an ideal correction effect. At the same time, through the adaptive adjustment of the lengths and orientations of the pulling telescopic rod and the angle-adjusting telescopic rod and the manual cooperation between the pulling telescopic rod and the angle-adjusting telescopic rod, the corner surfaces of the square duct bent along the X-axis and Y-axis can be synchronously and adaptively corrected. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a three-dimensional schematic diagram of the running track when the present invention corrects the square ventilation duct (upper surface and side) bent along the X-axis.

[0033] Figure 2 It is a three-dimensional schematic diagram of the running track when the present invention corrects the square ventilation duct (upper surface and side) bent along the Y-axis.

[0034] Figure 3 It is Figure 1 A three-dimensional schematic diagram from another perspective.

[0035] Figure 4 It is Figure 2 A three-dimensional schematic diagram from another perspective.

[0036] Figure 5 It is a three-dimensional schematic diagram of the running track when the present invention corrects the square ventilation duct (lower surface and another side) bent along the X-axis.

[0037] Figure 6 It is a three-dimensional schematic diagram of the running track when the present invention corrects the square ventilation duct (lower surface and another side) bent along the Y-axis.

[0038] Figure 7 It is Figure 5 A three-dimensional schematic diagram from another perspective.

[0039] Figure 8 It is Figure 6 A three-dimensional schematic diagram from another perspective.

[0040] Figure 9 It is a three-dimensional schematic diagram of the whole when the present invention corrects the upper surface and side of the square ventilation duct.

[0041] Figure 10 This is a three-dimensional schematic diagram of the overall shape when the lower surface and the other side of the square ventilation duct are corrected according to the present invention.

[0042] Figure 11 This is a three-dimensional structural schematic diagram of parts such as the central axis, fixed disk, and magnetic ring of the present invention after being sectioned along the X-axis.

[0043] Figure 12 This is a schematic diagram of the connection structure of the central axis, fixed disk, and magnetic ring of the present invention.

[0044] Figure 13 This is a three-dimensional schematic diagram of the separated central axis, fixed disk, and magnetic ring of the present invention.

[0045] Figure 14 This is a three-dimensional structural schematic diagram of the central axis, fixed disk, and magnetic ring of the present invention after being sectioned along the Y-axis.

[0046] Figure 15 This is a front view sectional structural schematic diagram of the magnetic ring of the present invention.

[0047] Figure 16 For the present invention Figure 14 The enlarged structural schematic diagram at position A in

[0048] Figure 17 For the present invention Figure 15 The enlarged structural schematic diagram at position B in

[0049] Figure 18 This is a schematic diagram for the stage analysis of the negative pressure compensation type correction operation of the present invention.

[0050] In the figure: 1. Support platform; 11. Pulling telescopic rod; 12. Angle-adjusting telescopic rod; 2. Lifting mechanism; 3. Central axis; 4. Fixed disk; 41. Annular limiting groove; 42. Sliding ball; 43. Distance-adjusting groove; 5. Magnetic ring; 51. Negative pressure suction cavity; 52. Piston plate; 53. Distance-adjusting rod; 6. Landing frame; 61. Return spring; 7. Suction cup. Detailed implementation manners

[0051] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0052] Please refer to Figures 1 to 18, the present invention provides a technical solution: a deformation correction device for a steel square ventilation duct, including a support platform 1, and further including a traction type walking control component manually controlled below the support platform 1, magnetic rings 5 arranged at equal intervals along the X-axis and Y-axis above the support platform 1, and suction cups 7 distributed at equal angles inside the magnetic rings 5 for correcting deformation by combining magnetic attraction and negative pressure suction;

[0053] Central shafts 3 are installed at the central axes of the magnetic rings 5 arranged at equal intervals along the X-axis and Y-axis;

[0054] A lifting mechanism 2 is installed between the magnetic rings 5 arranged at equal intervals along the X-axis and the support platform 1;

[0055] The magnetic rings 5 arranged at equal intervals along the Y-axis are vertically fixedly connected to the support platform 1 through the central shafts 3.

[0056] The lifting mechanism 2 includes a rod base vertically fixed on the upper surface of the support platform 1 and having tooth blocks equally distributed on one side, a sliding sleeve sleeved outside the rod base and fixedly connected to the central shaft 3 of the magnetic rings 5 distributed along the X-axis, a hand-cranked winch installed at the open end of the sliding sleeve and meshing with the tooth blocks on the side of the rod base, and a support spring wound between the rod base and the sliding sleeve to prevent the sliding sleeve from falling due to gravity.

[0057] One end of the support spring is welded to the bottom of the rod base, and the other end of the support spring is fixed to the lower end of the sliding sleeve.

[0058] The traction type walking control component includes a pulling telescopic rod 11 rotatably connected to the lower end of the support platform 1 through a bearing and an angle-adjusting telescopic rod 12 rotatably connected to the lower surface of the support platform 1 through a hinge assembly;

[0059] An L-shaped grip rod for facilitating the 90-degree turning of the correction device is arranged at the lower end of the pulling telescopic rod 11.

[0060] Fixed disks 4 are fixedly arranged at equal intervals on the outer wall of the central shaft 3, and an annular limiting groove 41 is formed on the side surface of the fixed disk 4 close to the magnetic ring 5;

[0061] Sliding balls 42 are slidably distributed at equal angles inside the annular limiting groove 41, and the ends of the sliding balls 42 penetrate through the annular limiting groove 41 and are fixed to the outer side wall of the magnetic ring 5.

[0062] Negative pressure suction cavities 51 are formed at equal angles inside the magnetic rings 5, a piston plate 52 is slidably arranged in a sealed manner inside the negative pressure suction cavities 51, and one end of the piston plate 52 penetrates through the central channel of the magnetic ring 5.

[0063] One end of an adjusting rod 53 is hinged to the outer end of the central channel of a magnetic ring 5 where a piston plate 52 is located, and an adjusting groove 43 is formed on the outer surface of a fixed disk 4 close to one side of the magnetic ring 5. The other end of the adjusting rod 53 is slidably arranged inside the adjusting groove 43.

[0064] The adjusting groove 43 is composed of two parts: symmetrically arranged centripetal arch grooves and symmetrically arranged concentric grooves.

[0065] A positioning frame 6 is slidably arranged through the end of a negative pressure suction cavity 51 far from the piston plate 52.

[0066] The positioning frame 6 is made of metal and is in a magnetically attracted state where it can slide under force with the magnetic ring 5.

[0067] The T-shaped through-type sleeve-shaped rigid end of a suction cup 7 is slidably arranged in a through groove of the positioning frame 6 in a snap-fit manner.

[0068] The outer end of the suction cup 7 located outside the positioning frame 6 is made of a flexible material, and a return spring 61 is wound between the rigid inner end of the suction cup 7 and the positioning frame 6.

[0069] One end of the return spring 61 is welded to the rigid inner end of the suction cup 7, and the other end of the return spring 61 is fixed to the inner wall of the through groove of the positioning frame 6.

[0070] A method for correcting the deformation of a steel square ventilation duct, the correction method comprising the following steps:

[0071] S1: Place a number of horizontally and vertically combined magnetic rings 5 in an adjusted state on the square ventilation duct, so that a number of groups of magnetic rings 5 arranged at equal intervals along the X-axis and a number of groups of magnetic rings 5 arranged at equal intervals along the Y-axis are respectively in corresponding contact with the upper surface and one side of the square ventilation duct. Then manually adjust the pulling telescopic rod 11 and the angle-adjusting telescopic rod 12 to a more appropriate length, and then pull the whole device to move in a contacting manner on the upper surface and the side of the square ventilation duct through the pulling telescopic rod 11, and use the magnetic attraction of the magnetic ring 5 and the negative pressure adsorption effect of the suction cup 7 on the side of the magnetic ring 5 to achieve the arching correction of the sunken surface.

[0072] S2: Place a number of horizontally and vertically combined magnetic rings 5 in an adjusted state on the square ventilation duct, so that a number of groups of magnetic rings 5 arranged at equal intervals along the X-axis are in contact with the lower surface of the square ventilation duct, and a number of groups of magnetic rings 5 arranged at equal intervals along the Y-axis are in contact with the other side of the square ventilation duct. Then manually adjust the pulling telescopic rod 11 and the angle-adjusting telescopic rod 12 to a more appropriate length, and again use the magnetic attraction of the magnetic ring 5 and the negative pressure adsorption effect of the suction cup 7 on the side of the magnetic ring 5 to achieve the arching correction of the lower surface and the other side of the square ventilation duct, so as to achieve the convenient correction of the four sides of the steel square ventilation duct, and at the same time, it can also support the synchronous correction of two 90-degree connecting elbows bent along the X-axis and along the Y-axis.

[0073] Working principle: The present invention mainly corrects the deformed ventilation duct after installation, aiming to eliminate the cumbersome steps of demolition and installation and prevent possible secondary deformation during the demolition and installation process. At the same time, it is necessary to synchronously correct two 90-degree connecting elbows bent along the X-axis and the Y-axis. The present invention processes the correction of the deformed ventilation duct in two steps;

[0074] The first step: First, simultaneously correct the upper surface and one side of the square ventilation duct. As shown in Figure 1 , Figure 2 and Figure 9 , by rotating the hand winch with a crank, the sliding sleeve carries a plurality of groups of magnetic rings 5 arranged at equal intervals along the X-axis on the side to move vertically upward. During the upward movement of the sliding sleeve, the support spring sleeved outside the rod seat gradually returns upward (the purpose of setting the support spring is to provide an upward supporting force for the sliding sleeve and a plurality of groups of magnetic rings 5 arranged at equal intervals along the X-axis on the side of the sliding sleeve to prevent the sliding sleeve from slipping naturally), so that a plurality of groups of magnetic rings 5 arranged at equal intervals along the X-axis and a plurality of groups of magnetic rings 5 arranged at equal intervals along the Y-axis reach the position and state as shown in Figure 9 ;

[0075] Then, place a plurality of groups of magnetic rings 5 combined horizontally and vertically in the adjusted state on the square ventilation duct in the manner of Figure 1 , so that a plurality of groups of magnetic rings 5 arranged at equal intervals along the X-axis and a plurality of groups of magnetic rings 5 arranged at equal intervals along the Y-axis are respectively in corresponding contact with the upper surface and one side of the square ventilation duct. Subsequently, manually adjust the pulling telescopic rod 11 and the angle-adjusting telescopic rod 12 to a more appropriate length, and then pull the whole device through the pulling telescopic rod 11 to perform a fitting walk on the upper surface and the side of the square ventilation duct. Among them, the magnetic rings 5 are magnetically attached to the steel square ventilation duct, and the rolling walk of the magnetic rings 5 on the smooth surface of the square ventilation duct can be realized through the traction method. When encountering the X-axis elbow shown in Figure 1 , the whole correction device can be turned horizontally by 90 degrees as shown in Figure 1 and Figure 3 by fixing the pulling telescopic rod 11 and pulling the angle-adjusting telescopic rod 12 to adapt to the square ventilation duct bent along the X-axis; when encountering the Y-axis elbow shown in Figure 2 , the whole correction device can be turned vertically by 90 degrees as shown in Figure 2 and Figure 4 by fixing the pulling angle-adjusting telescopic rod 12 and controlling the angle of the L-shaped grip rod at the lower end of the pulling telescopic rod 11 to adapt to the square ventilation duct bent along the Y-axis;

[0076] Correction principle: As shown in Figure 14 and Figure 15As shown in the figure, when the magnetic ring 5 is attached to the outer surface of the steel square ventilation duct, the magnetic ring 5 will be tightly attached to the outer surface of the duct under the action of magnetic adsorption. When the staff pulls the correction device, the magnetic ring 5 will remain attached to the outer surface of the duct and roll. During the rolling walking process, when the suction cup 7 does not contact the surface of the duct, it will remain as shown in the figure. Figure 15 The convex state beyond the outer diameter of the magnetic ring 5 is shown. During the rolling walking, the fixed plate 4 will not rotate with it, and when the suction cup 7 is attached to the concave surface, a pull-up correction of the concave surface will be formed through three stages. Figure 18 ;

[0077] Contact stage: As the rolling continues, the suction cup 7 will gradually contact the concave surface of the pipe and slide inward along the inner wall of the drop frame 6 under the extrusion of the pipe surface and stretch the reset spring 61, so that the suction cup 7 smoothly enters the gap outside the magnetic ring 5. The suction cup 7 and the outer wall of the steel plate will maintain a state of adhesion and adsorption. At this time, the suction cup 7 and the concave part form a close seal, and the air inlet at the lower end of the suction cup 7 is closed by the concave steel plate;

[0078] 2. Correction and compensation stage: when the suction cup 7 is attached to the concave surface, the distance adjustment rod 53 corresponding to the suction cup 7 just rotates along the track of the distance adjustment groove 43 to the proximal arch groove. Since the eccentric distance changes, the proximal arch groove will synchronously pull the corresponding piston plate 52 through the adjustment of the eccentric position of the distance adjustment rod 53. Since the eccentric distance of the distance adjustment rod 53 is rapidly shortened, the piston plate 52 connected to the distance adjustment rod 53 will also synchronously undergo an adaptive proximal movement, thereby generating negative pressure inside the negative pressure suction chamber 51. Since the air inlet of the suction cup 7 is sealed and attached to the concave surface of the pipeline, gas cannot enter to compensate for the negative pressure. Therefore, the negative pressure quickly generated inside the negative pressure suction chamber 51 can only be compensated by the displacement caused by the suction cup 7 forcibly pulling up the concave surface. Therefore, when the negative pressure is quickly generated, the concave surface of the pipeline will be forcibly pulled up for correction.

[0079] 3. Disengagement stage: when the concave surface of the pipe is pulled up to compensate for the negative pressure (the pulling up is a reset work, with the support of metal reset stress, but when the steel plate is completely reset, the negative pressure suction needs to overcome a large forced deformation stress to pull the steel plate up, so the present invention will not cause the steel plate surface to be pulled up), because the magnetic ring 5 is pressed against the outer wall of the steel plate on both sides of the depression to restrict the surface of the steel plate, the negative pressure suction that still exists will pull the suction cup 7 from the corrected steel plate surface and release the adsorption seal.

[0080] Then, the magnetic ring 5 continues to roll and drives the suction cup 7 to fall into position for correction next time, so that the effect of adaptively detecting surface depressions during walking and quickly correcting the depressions by means of negative pressure is achieved in this cycle;

[0081] At the same time, since the magnetic rings 5 are connected through the fixing plate 4, several magnetic rings 5 arranged at equal intervals can be regarded as a roller fitting on a smooth surface. Although the square duct is composed of four thin steel plates, at the corners, two thin steel plates are stacked and mutually perpendicular and abutted. Therefore, the four corners of the square duct have good pressure-bearing capacity and generally will not undergo concave deformation. Thus, the "roller" resting on the corners of the square duct can be understood to always maintain a horizontal posture with the standard surface. When the "roller" with magnetism rolls on a smooth surface with concave deformation, it will generate a certain adsorption force on the concave part, thereby contributing to the arch correction of the concave deformation and, in cooperation with the above-mentioned negative pressure adsorption correction method, can achieve a relatively ideal correction effect.

[0082] Step 2: Then, simultaneously correct the lower surface and another side of the square ventilation duct. As Figure 5 , Figure 6 and Figure 10 shown, similarly, rotate the hand crank of the hand-operated winch to make the sliding sleeve carry the side along which several groups of magnetic rings 5 are arranged at equal intervals along the X-axis move vertically downward. During the downward movement of the sliding sleeve, the support spring sleeved outside the rod seat is compressed downward, so that several groups of magnetic rings 5 arranged at equal intervals along the X-axis and several groups of magnetic rings 5 arranged at equal intervals along the Y-axis reach the position and state as Figure 10 shown;

[0083] Immediately, turn the orientation of the correction device so that several groups of magnetic rings 5 arranged at equal intervals along the X-axis are in contact with the lower surface of the square ventilation duct, and several groups of magnetic rings 5 arranged at equal intervals along the Y-axis are in contact with another side of the square ventilation duct. Subsequently, similarly, implement the correction on the lower surface and another side of the square ventilation duct according to the operation process and principle in the first step, so as to realize the convenient correction of the four sides of the steel square ventilation duct, and at the same time, it can also support the synchronous correction of two 90-degree connecting elbows bent along the X-axis and along the Y-axis.

[0084] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A steel square ventilation duct deformation correction device, comprising a support platform (1), characterized in that: It also includes a manually controlled traction-type walking control component arranged below the support platform (1), magnetic rings (5) arranged at equal intervals along the X-axis and the Y-axis above the support platform (1), and suction cups (7) distributed at equal angles inside the magnetic rings (5) for correcting deformation by combining magnetic attraction and negative pressure suction; The central axes of the magnetic rings (5) arranged at equal intervals along the X-axis and the Y-axis are all installed with central axes (3); A lifting mechanism (2) is installed between the magnetic rings (5) arranged at equal intervals along the X-axis and the supporting platform (1); The magnetic rings (5) arranged at equal intervals along the Y axis are vertically fixedly connected to the support platform (1) via the central axis (3); The outer wall of the central shaft (3) is fixed with fixed disks (4) arranged at equal intervals, and a surface of the fixed disk (4) close to the magnetic ring (5) is provided with an annular limiting groove (41); Sliding balls (42) are equiangularly distributed inside the annular limiting groove (41), and ends of the sliding balls (42) penetrate the annular limiting groove (41) and are fixed to the outer wall of the magnetic ring (5); The magnetic ring (5) is provided with negative pressure suction chambers (51) at equal angles inside, and a piston plate (52) is provided inside the negative pressure suction chamber (51) in a sealed and slidable manner, and one end of the piston plate (52) is provided through the central channel of the magnetic ring (5); The piston plate (52) is hingedly connected to one end of a distance adjusting rod (53) at the outer end of the central channel of the magnetic ring (5), and a distance adjusting groove (43) is formed on the outer surface of the fixed plate (4) close to the magnetic ring (5), and the other end of the distance adjusting rod (53) is slidably arranged inside the distance adjusting groove (43); The distance adjustment groove (43) is composed of two parts: a symmetrically arranged proximal arch groove and a symmetrically arranged concentric groove.

2. The steel square ventilation duct deformation correction device according to claim 1 is characterized in that: The lifting mechanism (2) comprises a rod seat vertically fixed to the upper surface of the support platform (1) and having tooth blocks evenly spaced on one side, a sliding sleeve arranged outside the rod seat and fixedly connected to the central axis (3) of the magnetic ring (5) distributed along the X-axis, a hand-cranked winch installed at the open end of the sliding sleeve and meshing with the tooth blocks on the side of the rod seat, and a support spring wound between the rod seat and the sliding sleeve to prevent the sliding sleeve from falling due to gravity.

3. The steel square ventilation duct deformation correction device according to claim 2 is characterized in that: One end of the support spring is welded to the bottom of the rod seat, and the other end of the support spring is fixed to the lower end of the sliding sleeve.

4. The steel square ventilation duct deformation correction device according to claim 1, characterized in that: The traction-type walking control assembly comprises a pulling telescopic rod (11) rotatably connected to the lower end of the support platform (1) via a bearing, and an angle-adjusting telescopic rod (12) rotatably connected to the lower surface of the support platform (1) via a hinge assembly; The lower end of the pulling telescopic rod (11) is provided with an L-shaped handle rod for facilitating the control of the correction device to turn ninety degrees.

5. The steel square ventilation duct deformation correction device according to claim 1 is characterized in that: A landing frame (6) is slidably provided at the end of the negative pressure suction chamber (51) away from the piston plate (52); The landing frame (6) is made of metal and maintains a magnetic attraction state with the magnetic ring (5) so as to be able to slide under force.

6. The steel square ventilation duct deformation correction device according to claim 5, characterized in that: The T-shaped through-type sleeve-shaped hard end of the suction cup (7) is slidably arranged in the through-type groove of the landing frame (6) in a snap-fitting manner; The outer end of the suction cup (7) located outside the landing frame (6) is made of a flexible material, and a return spring (61) is wound between the hard inner end of the suction cup (7) and the landing frame (6); One end of the return spring (61) is welded to the hard inner end of the suction cup (7), and the other end of the return spring (61) is fixed to the inner wall of the middle through groove of the landing frame (6).

7. A method for correcting deformation of a steel square ventilation duct, applicable to a device for correcting deformation of a steel square ventilation duct as claimed in claim 4, characterized in that: The correction method comprises the following steps: S1: placing a plurality of adjusted horizontal and vertical combinations of magnetic rings (5) on a square ventilation duct, so that the plurality of magnetic rings (5) arranged at equal intervals along the X axis and the plurality of magnetic rings (5) arranged at equal intervals along the Y axis are respectively fitted with the upper surface and one side of the square ventilation duct, and then manually adjusting the pulling telescopic rod (11) and the angle adjustment telescopic rod (12) to a more appropriate length, and then pulling the telescopic rod (11) to pull the device as a whole to move in a fitting manner on the upper surface and the side of the square ventilation duct, and utilizing the magnetic attraction of the magnetic rings (5) and the negative pressure adsorption effect of the side suction cups (7) of the magnetic rings (5) to achieve arch correction of the concave surface; S2: placing a plurality of adjusted horizontal and vertical magnetic rings (5) on the square ventilation duct, so that the plurality of magnetic rings (5) arranged at equal intervals along the X axis fit with the lower surface of the square ventilation duct, and the plurality of magnetic rings (5) arranged at equal intervals along the Y axis fit with the other side of the square ventilation duct, then manually adjusting the pulling telescopic rod (11) and the angle adjustment telescopic rod (12) to a more appropriate length, and again utilizing the magnetic attraction of the magnetic rings (5) and the negative pressure adsorption effect of the side suction cups (7) of the magnetic rings (5) to achieve arch correction of the lower surface and the other side of the square ventilation duct, thereby achieving convenient correction of the four sides of the steel square ventilation duct, and at the same time, it can also be used to match the synchronous correction of two types of 90-degree connecting elbows bent along the X axis and along the Y axis.

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