Walking mechanism for variable-diameter steel pipe end face

Abstract

The utility model discloses a walking mechanism for the end face of a variable-diameter steel pipe, and belongs to the technical field of water conservancy and hydropower. Comprising a main beam, a guide wheel arranged on the inner side of the lower end of the main beam and a driving wheel arranged on the outer side. And the guide wheel is matched with the main beam for adjustment and installation through the alignment plate. According to the utility model, the installation position is adjusted to adapt to the end face circumference walking operation of pressure steel pipe ring ribs with various diameters; the alignment plate and the first mounting plate are matched with the positioning holes, the hole position lines and the alignment lines, so that adaptive positioning of different radiuses is quickly realized; and different positioning included angles of the wheel turning radius adjusting cover are set, so that the device can walk along the tangential directions of different curvature radiuses.

Description

Technical Field

[0001] The utility model relates to the technical field of water conservancy and hydropower, in particular to a walking mechanism for the end face of a variable diameter steel pipe. Background Art

[0002] Pumped storage power stations use the height difference between the upper reservoir and the lower reservoir to store energy and generate electricity; the water diversion system and the tailwater system are equipped with long-distance high-strength pressure steel pipes. The diameter of the pressure steel pipe is larger at the top and smaller at the bottom, the wall thickness is thin at the top and thick at the bottom, and the material strength is small at the top and large at the bottom. It has the characteristics of variable diameter, multiple wall thicknesses, and different material strengths. In order to enhance the rigidity of the pressure steel pipe and the stability of the flow state, the outer wall of the large pressure steel pipe is equipped with a reinforcement ring, a water blocking ring, a thrust ring, etc., which are all a kind of annular reinforcement plate (commonly known as annular reinforcement).

[0003] Taking a domestic pumped-storage power station as an example, the parameters of a typical pipe section (straight pipe section) are shown in the following table.

[0004]

[0005] It can be seen from the above table that the number of pressure steel pipes in the pumped storage power station is huge; for such a huge number of ring reinforcement installations, the use of existing construction technology will take up a lot of manpower and even cause delays in the construction period.

[0006] The construction speed can be accelerated by setting up a hanging frame to provide an operating platform for personnel. However, the movement of the hanging frame is a problem. Since the inner diameter and wall thickness of the pressure steel pipe have various specifications, there is no suitable walking device that can meet the circumferential end surface walking of the variable diameter steel pipe. Utility Model Content

[0007] The utility model aims to solve the problem that there is no suitable device in the prior art that can meet the walking of the circumferential end surface of a variable diameter steel pipe, and proposes a walking mechanism for the end surface of a variable diameter steel pipe.

[0008] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0009] A walking mechanism for the end face of a variable diameter steel pipe comprises a main beam, a guide wheel arranged on the inner side of the lower end of the main beam, and a driving wheel arranged on the outer side;

[0010] The guide wheel is adjusted and installed in coordination with the main beam through the alignment plate.

[0011] In some embodiments, two of the guide wheels and the driving wheels are respectively provided near the end.

[0012] In some embodiments, the alignment plate is fixedly connected to the top end of the guide wheel;

[0013] A first mounting plate corresponding to the alignment plate is fixedly provided on the lower sides of both ends of the main beam;

[0014] The alignment plate and the first mounting plate are provided with a plurality of groups of long strip-shaped positioning holes correspondingly;

[0015] A plurality of positioning lines are arranged on the outer sides of the alignment plate and the first mounting plate.

[0016] In some embodiments, the guide wheel includes a vertically arranged extension column and a planar wheel rotatably arranged at the lower end of the extension column.

[0017] In some embodiments, a stiffening plate is provided on the outer side of the extension column.

[0018] In some embodiments, a second mounting plate is provided extending outwardly from the lower sides of both ends of the main beam;

[0019] The driving wheel is provided with an upwardly extending round handle connected to the second mounting plate.

[0020] In some embodiments, a first positioning screw hole group is opened on the upper end surface of the extended round handle, and a second positioning screw hole group is opened on the upper end surface of the second mounting plate; the second positioning screw hole group is concentrically arranged with the first positioning screw hole group; and the second positioning screw hole group is located outside the first positioning screw hole group.

[0021] In some embodiments, it further includes: a wheel turning radius adjustment cover;

[0022] The wheel turning radius adjustment cover is provided with through holes corresponding to the first positioning screw hole group and the second positioning screw hole group, and is penetrated by bolts to connect with the second mounting plate and the extended round handle.

[0023] In some embodiments, an extended connection seat is provided extending backward from the middle position of the main beam.

[0024] Compared with the prior art, the utility model provides a walking mechanism for the end face of a variable diameter steel pipe, which has the following beneficial effects.

[0025] 1. The utility model can adapt to the circular walking operation of the end faces of the ring reinforcements of pressure steel pipes with various diameters by adjusting the installation position.

[0026] 2. In the utility model, the alignment plate and the first mounting plate are matched with positioning holes, hole position lines and alignment lines to quickly realize the adaptive positioning of different radii; the wheel turning radius adjustment cover 7 is set with different positioning angles to realize the tangential movement of the device along different curvature radii; the driving wheel tread groove and the guide limit assembly ensure the safety of the operation process.

[0027] Other advantages, objectives and features of the present invention will be described in the following description to some extent; and will be apparent to those skilled in the art based on the following examination and study to some extent; or, may be taught from the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the front structure of the utility model.

[0029] Figure 2 It is a schematic diagram of the rear structure of the utility model.

[0030] Figure 3 It is a schematic diagram of the lower structure of the utility model.

[0031] Figure 4 It is a schematic diagram of the top structure of the utility model.

[0032] Figure 5 It is a schematic diagram of the structure of the utility model when viewed from above.

[0033] Figure 6 This is a structural diagram of the main beam.

[0034] Figure 7 This is a schematic diagram of the lower structure of the main beam.

[0035] Figure 8 This is a top view structural diagram of the main beam.

[0036] Fig. 9 It is a schematic diagram of the side structure of the alignment plate and the first mounting plate.

[0037] Fig.10 Schematic diagram of the structure of the guide wheel.

[0038] Fig.11 Schematic diagram of the explosion state of the guide wheel.

[0039] Fig.12 This is a schematic diagram of the cross-sectional view of a plane wheel.

[0040] Fig.13 It is a schematic diagram of the explosion state of the second mounting plate and the driving wheel.

[0041] Fig.14 This is a schematic diagram of the structure of the wheel turning radius adjustment cover.

[0042] Fig.15 This is a schematic diagram of the status of the expansion connector.

[0043] Fig.16 This is a schematic diagram of the side structure of the expansion connector.

[0044] Fig.17 This is a status diagram of the matching work rack.

[0045] Fig.18 for Fig.17 Schematic diagram of the enlarged structure at point A in the middle.

[0046] Fig.19 It is a schematic diagram of the use state of the utility model.

[0047] Fig. 20 This is a structural diagram of the usage status of the work rack.

[0048] In the figure:

[0049] 1. Main beam; 2. Guide wheel; 21. Extension column; 22. Plane wheel; 23. Reinforced plate; 3. Driving wheel; 31. Extension round handle; 32. First positioning screw hole group; 4. Alignment plate; 5. First mounting plate; 6. Second mounting plate; 61. Second positioning screw hole group; 7. Wheel turning radius adjustment cover; 8. Extended connecting seat; 81. Vertical ear plate; 82. Strengthening wing plate; 9. Matching connection hole; 10. Vertical connecting plate. DETAILED DESCRIPTION

[0050] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0051] Reference Figure 1-20 A walking mechanism for the end face of a variable diameter steel pipe comprises a main beam 1, a guide wheel 2 arranged on the inner side of the lower end of the main beam 1, and a driving wheel 3 arranged on the outer side.

[0052] Among them, the main beam 1 is a long strip structure, which is made by cutting a rectangular steel pipe; two guide wheels 2 and two driving wheels 3 are respectively arranged near the two ends of the main beam 1 to form a mobile support.

[0053] like Fig.19 , 20 As shown; the guide wheel 2 and the driving wheel 3 cooperate to complete the guidance when walking in a circle on the upper end of the penstock; wherein the driving wheel 3 provides power, and the inner guide wheel 2 passively rolls or remains stationary on the inner circular surface of the penstock, and can also play a role in limiting insurance when tilting occurs.

[0054] Preferably, Fig.10 , 11 As shown; the guide wheel 2 includes a vertically arranged extension column 21, and a flat wheel 22 rotatably arranged at the lower end of the extension column 21; wherein, grooves for matching bearings and elastic retaining rings are opened at the upper and lower ends of the inner ring of the flat wheel 22; and a groove for matching the elastic retaining ring is opened at the end position of the extension column 21.

[0055] Specifically: the extension column 21 is a vertical round steel, and the lower end of the round steel is machined with a boss, a small cylinder, a groove, etc.; two deep groove ball bearings with dust covers are installed on the small cylinder, and the lowermost bearing is fixed to the shaft installed in the shaft end groove with an elastic retaining ring; at the same time, the outer surface of the plane wheel 22 is a short cylinder, and the inside is a stepped hole with large ends and a small middle. An annular groove is machined on the inner hole near the end surface, which is used to fix the bearing with an elastic retaining ring in the installation hole.

[0056] Furthermore, a stiffening plate 23 is provided on the outer side of the extension column 21 .

[0057] Preferably, except for one side close to the inner wall of the steel pipe, three right-angled trapezoidal stiffening plates are axially arranged at 90° intervals on the outer diameter of the vertical round steel to enhance the vertical stiffness of the guide seat; the vertical round steel and the right-angled trapezoidal stiffening plates are connected into one by welding.

[0058] In some embodiments, the guide wheel 2 is adjusted and installed in coordination with the main beam 1 through the alignment plate 4 to achieve the adaptation of the top end of steel pipes with different diameters.

[0059] Among them, the alignment plate 4 is a rectangular flange, which is fixedly connected to the top of the guide wheel 2 by welding; the first mounting plate 5 corresponding to the alignment plate 4 is fixedly arranged on the lower side of both ends of the main beam 1; and a plurality of groups of long strip-shaped positioning holes are correspondingly opened on the alignment plate 4 and the first mounting plate 5.

[0060] like Fig. 9 As shown, four strip holes are provided on the alignment plate 4 and the first mounting plate 5 ; meanwhile, a plurality of positioning lines are provided on the outer sides of the alignment plate 4 and the first mounting plate 5 .

[0061] Preferably, two positioning lines are arranged on the outer side of the first mounting plate 5 , and three positioning lines are arranged on the outer side of the alignment plate 4 .

[0062] Among them, the positioning lines on the outside of the first mounting plate 5 are the alignment line and the 6.4-meter hole position line; the positioning lines on the outside of the alignment plate 4 are the 5.6-meter hole position line, the 4.8-meter hole position line, and the 3.4-meter hole position line; accordingly, when the 5.6-meter hole position line, the 4.8-meter hole position line, and the 3.4-meter hole position line correspond to the alignment line, respectively, it represents adjustment to adapt to the pressure steel pipe of the corresponding specification; when the 5.6-meter hole position line is further moved outward to correspond to the 6.4-meter hole position line, it represents adjustment to adapt to the pressure steel pipe of 6.4m hole position specification.

[0063] See the table below for specific correspondence.

[0064]

[0065] The first mounting plate 5 is also a rectangular flange; a reinforcing triangle plate connecting the main beam 1 and the first mounting plate 5 is arranged above the first mounting plate 5 .

[0066] During processing and manufacturing, the main beam 1 adopts a rectangular steel pipe of suitable length, and two rectangular flanges are welded under the two ends of the rectangular steel pipe as the first mounting plate 5; the flange is arranged asymmetrically with the rear end longer and the front end shorter relative to the axis of the rectangular pipe, and long holes with the same diameter, equal spacing and different lengths as the upper end flange (alignment plate 4) of the guide wheel 2 are opened on the flange surface to achieve bolt fixation of the two.

[0067] In some embodiments, the driving wheel 3 is arranged on the lower outer side of the main beam 1 to provide power for circular movement along the upper end of the pressure steel pipe and position locking during operation; its angle is adjusted to adapt to the circumferential movement of different steel pipes.

[0068] Among them, the driving wheel 3 is a DC driving wheel assembly, which is professionally produced by a large number of domestic manufacturers. You can directly purchase the purchased parts of the corresponding specifications. Requirements: The load-bearing load is not less than 1 ton / single wheel, and the driving power is not less than 1kw / single wheel; preferably, the speed is 3,000 rpm, the reduction ratio is 25k, and the braking torque is 8N.m. It integrates the motor, reducer, and brake lock into one, and can achieve stepless speed regulation and synchronous movement through the electrical control system; the tread of the driving wheel 3 is a flange shape on both sides, which is used for guiding and limiting the walking on the pipe wall; the walking speed is controlled to be steplessly regulated within the range of 1.3-6m / min.

[0069] At the same time, a second mounting plate 6 is extended outwardly from the lower sides of both ends of the main beam 1 ; the driving wheel 3 is provided with an upwardly extending round handle 31 connected to the second mounting plate 6 .

[0070] like Fig.13 As shown, an upwardly protruding extended round handle 31 is provided above the driving wheel 3, and a hole is opened on the second mounting plate 6 to match it.

[0071] Preferably, recesses are provided on the upper and lower surfaces of the second mounting plate 6 to facilitate positioning and installation.

[0072] Correspondingly, a first positioning screw hole group 32 is opened on the upper end surface of the extended round handle 31, and a second positioning screw hole group 61 is opened on the upper end surface of the second mounting plate 6; the first positioning screw hole group 32 and the second positioning screw hole group 61 are respectively composed of a plurality of surrounding screw holes; the second positioning screw hole group 61 is concentrically arranged with the first positioning screw hole group 32, and the second positioning screw hole group 61 is located on the outside of the first positioning screw hole group 32; the extended round handle 31 penetrates until it is flush with the upper end surface of the second mounting plate 6.

[0073] It also includes: a wheel turning radius adjustment cover 7.

[0074] The wheel turning radius adjustment cover 7 is provided with through holes corresponding to the first positioning screw hole group 32 and the second positioning screw hole group 61, and is connected to the second mounting plate 6 and the extended round handle 31 through bolts; by controlling the angle between the inner and outer ring holes on the wheel turning radius adjustment cover 7, a wheel angle adapted to different pressure steel pipes is formed.

[0075] During processing and manufacturing, two bottom plates are set as the second mounting plates 6 on the inner side of the rectangular flange first mounting plates 5 at both ends of the rectangular steel tube (main beam 1); the bottom plate is arranged toward the outside, and stepped vertical holes with recesses are opened on the upper and lower sides of the bottom plate. The smaller hole in the middle is used to install the upper end extended round handle 31 of the DC drive wheel assembly, and the slightly larger lower recess plays a load-bearing and limiting role; the upper recess is used for the installation of the wheel turning radius adjustment cover 7; four threaded holes are evenly distributed on the step surface of the upper recess; according to the adaptation specifications, it is ensured that the axes of two of the threaded holes are parallel to the axis of the 6.4-meter pressure steel pipe and are in the same plane, and the two groups of threaded holes on the bottom plates on both sides are symmetrical; at the same time, trapezoidal stiffening plates are set on both sides of the vertical holes of the bottom plate steps in front of the rectangular tube to ensure the stability of the asymmetric structure of the upper end beam.

[0076] like Fig.14 As shown; the positions of the two driving wheels 3 are controlled to match different end covers to correspond to pressure steel pipes of different diameters to achieve high precision and standardization.

[0077] Specifically, the wheel turning radius adjustment cover 7 is in the shape of a circular plate, and 6 evenly distributed small holes are provided on the inner circle for connection with the threaded holes (first positioning screw hole group 32) on the end face of the circular handle 31 extending from the upper end of the DC motor driving wheel; 4 evenly distributed large holes are provided on the outer circle for connection with the threaded holes (second positioning screw hole group 61) on the bottom plate recess; for example, the angles between two of the small holes and the cross lines of the two large holes are controlled to be 0°, 1.5346°, 3.5891°, and 9.5871°, respectively, so as to adjust the turning radius of the DC motor driving wheel when operating 6.4 m, 5.6 m, 4.8 m, and 3.4 m pressure steel pipes, respectively.

[0078] It can be understood that the device is used for the annular rib assembly of straight pipe sections of pressure steel pipes; the parameters provided above are adapted to the inner diameters of steel pipes of 3.4 meters, 4.8 meters, 5.6 meters, and 6.4 meters, and the wall thickness is 20-60 mm; when the wall thickness of the pressure steel pipe is greater than 60 mm, the tread width of the direct motor-driven wheel needs to be increased accordingly; at the same time, when the inner diameter of the steel pipe is different values ​​within the range of 3.4-6.4 meters, the hole angle of the wheel turning radius adjustment cover 7 needs to be recalculated and processed.

[0079] In some embodiments, an extended connection seat 8 is provided extending backward from the middle position of the main beam 1 to facilitate the installation and expansion of other components.

[0080] like Fig.17As shown, a hanger is arranged on the outside to provide a working space; personnel can work on the outer wall of the pressure steel pipe on the hanger; at the same time, the device drives the hanger to move along the upper circumference of the steel pipe to cover all working surfaces outside the steel pipe.

[0081] Furthermore, a plurality of groups of long strip-shaped matching connection holes 9 are provided on the extended connection seat 8, and are provided with pipe diameter markings; a vertical connection plate 10 is provided at the top of the hanger, and a plurality of groups of round holes are provided on the vertical connection plate 10; bolts are passed through the round holes to correspond to the left or right end of the matching connection holes 9 to form different adaptation diameters.

[0082] Specifically, Fig.15 , 16 , 17, and 18; there are four rows of matching connection holes 9, each row has four holes; the second and fourth rows are arranged closer to the inside and are offset from the first and third rows. Thus, the left end of the matching connection holes 9 in the first and third rows corresponds to a 4.8m diameter, and the right end corresponds to a 3.4m diameter; the left end of the matching connection holes 9 in the second and fourth rows corresponds to a 6.4m diameter, and the right end corresponds to a 5.6m diameter; correspondingly, there are two rows of circular holes, each row has four holes; and the assembly connection is performed by 8 bolts.

[0083] In some embodiments, the extended connection seat 8 includes: two symmetrically arranged vertical ear plates 81, and a reinforcing wing plate 82 for clamping and fixing the two vertical ear plates 81; accordingly, two vertical connection plates 10 are provided, corresponding to the two sides of the interior of the extended connection seat 8; the matching connection holes 9 are opened on the vertical ear plates 81.

[0084] During processing and manufacturing, two vertical ear plates 81 are symmetrically arranged in the middle of the outer side of the rectangular steel pipe (main beam 1), and two groups of long holes with equal row spacing, equal column spacing and unequal lengths are opened on the ear plates. Each group is arranged with two rows and four columns, a total of eight long holes. The upper group of long holes is located at the rear, and is used for adjusting the position of the hanger when operating with a pipe diameter of 4.8 meters and 3.4 meters; the lower group of long holes is located at the front, and is used for adjusting the position of the hanger when operating with a pipe diameter of 6.4 meters and 5.6 meters. The outer side surface of the vertical ear plate 81 is marked with the numbers of the pipe diameters at the installation position; at the same time, two wing plates are arranged on the upper and lower sides of the front end of the vertical ear plate 81 and the upper and lower sides of the rectangular steel pipe to enhance the rigidity of the upper end beam parts.

[0085] It should be noted that: it also includes an electrical control system to control the DC motor drive wheel; and an optional remote control function can be used to increase the convenience and safety of the operation process.

[0086] Take the straight pipe section with inner diameter φ6.4m×3m as an example.

[0087] 1. Adjustment of the turning radius of the DC motor drive wheel: The inner diameter of the steel pipe is 6.4 meters, and the wheel turning radius adjustment cover marked with "6.4 meter pressure cover" is used; the 4 positioning holes of the outer ring and the 6 mounting holes of the inner ring are collinear on the axis of the cross line, and the hole angle is 0°.

[0088] 2. Adjust the hole position of the alignment plate of the guide wheel: align the 5.6-meter hole position line marked on the innermost end of the long hole of the alignment plate with the 6.4-meter hole position line marked on the outermost end of the long hole of the first mounting plate 5, and install the bolt, washer, and nut connectors.

[0089] 3. Adjustment of the hole positions of the bracket and the extended connection seat: Install the vertical connection plate 10 of the bracket on the inner side of the extended connection seat 8, align it with the hole positions of the lower row of long holes of the vertical ear plate 81 close to the outer wall of the pressure steel pipe, install the bolts, washers and nuts, and the inner diameter of the assembled pressure steel pipe is 6.4 meters.

[0090] When in use, the tread of the DC motor driving wheel is stuck on the pipe wall, check and adjust the gap between the inner rim of the driving wheel and the inner wall of the steel pipe to 2-4mm, and the gap between the guide wheel and the inner wall of the steel pipe to 1-3mm. Turn on the power and move slowly along the circumference. The running speed can be adjusted steplessly through the electrical control system. After a trial run without interference, the corresponding operation can be carried out.

[0091] This device realizes the top movement of the variable diameter pressure steel pipe through the combined application of DC motor drive wheels, guide wheels, processing parts, etc., and has at least the following uses and effects:

[0092] The same device can be adapted to the assembly of penstock ring ribs of various diameters by adjusting the installation position; after the installation spacing of the driving wheel 3 is set, it is equal to a fixed chord length; when installed on the end surface of penstocks of different diameters, the corresponding turning radius, chord height, position of the guide limit assembly, etc. will have different values;

[0093] By setting different positioning angles of the wheel turning radius adjustment cover 7, the device can move tangentially along different curvature radii; the combination of the staggered long holes used in the connecting piece can reduce the length of the connecting piece and meet the multi-position adjustment function; the device of the present invention can meet the end surface movement of pressure steel pipes with different diameters;

[0094] The driving wheel tread grooves and guide limit components ensure the safety of the operation process; the driving wheel 3 is a grooved track wheel design, and the raised wheel rims on both sides can play a limiting role; the guide wheel 2 extends into the inner wall of the pressure steel pipe for guidance and limitation, ensuring the safety of the device working in a state of center of gravity deviation.

[0095] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

[0096] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0097] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A walking mechanism for the end face of a variable diameter steel pipe, characterized in that: It comprises a main beam (1), a guide wheel (2) arranged on the inner side of the lower end of the main beam, and a driving wheel (3) arranged on the outer side; The guide wheel (2) is adjusted and installed in coordination with the main beam (1) via the alignment plate (4).

2. The walking mechanism for the end face of a variable diameter steel pipe according to claim 1, characterized in that: Two of the guide wheels (2) and the drive wheels (3) are respectively arranged near the end.

3. The walking mechanism for the end face of a variable diameter steel pipe according to claim 1, characterized in that: The alignment plate (4) is fixedly connected to the top end of the guide wheel (2); First mounting plates (5) corresponding to the alignment plates (4) are fixedly arranged at the lower sides of both ends of the main beam (1); The alignment plate (4) and the first mounting plate (5) are provided with a plurality of groups of long strip-shaped positioning holes correspondingly; A plurality of positioning lines are arranged on the outer sides of the alignment plate (4) and the first mounting plate (5).

4. The walking mechanism for the end face of a variable diameter steel pipe according to claim 1, characterized in that: The guide wheel (2) comprises an extension column (21) arranged vertically, and a plane wheel (22) rotatably arranged at the lower end of the extension column (21).

5. The walking mechanism for the end face of a variable diameter steel pipe according to claim 4, characterized in that: A stiffening plate (23) is provided on the outer side of the extension column (21).

6. The walking mechanism for the end face of a variable diameter steel pipe according to claim 1, characterized in that: Second mounting plates (6) are provided extending outward from the lower sides of both ends of the main beam (1); The driving wheel (3) is provided with an upwardly extending round handle (31) connected to the second mounting plate (6).

7. The walking mechanism for the end face of a variable diameter steel pipe according to claim 6, characterized in that: The upper end surface of the extended circular handle (31) is provided with a first positioning screw hole group (32), and the upper end surface of the second mounting plate (6) is provided with a second positioning screw hole group (61); The second positioning screw hole group (61) is arranged concentrically with the first positioning screw hole group (32); and the second positioning screw hole group (61) is located outside the first positioning screw hole group (32).

8. The walking mechanism for the end surface of a variable diameter steel pipe according to claim 7, characterized in that: Also includes: Wheel turning radius adjustment cover (7); The wheel turning radius adjustment cover (7) is provided with through holes corresponding to the first positioning screw hole group (32) and the second positioning screw hole group (61), and is provided with bolts therethrough to connect with the second mounting plate (6) and the extended round handle (31).

9. The walking mechanism for the end face of a variable diameter steel pipe according to claim 1, characterized in that: An extended connection seat (8) is provided extending backwards from the middle position of the main beam (1).

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