A welding device based on a pile foundation cage inner support ring muscle expansion tightening mechanism

Abstract

The present application relates to the technical field of reinforcing cage preparation, and specifically provides a welding device based on a pile foundation cage inner support ring reinforcing bar expansion mechanism, which comprises a fixed shaft frame, a bearing frame fixedly arranged at the center region of the fixed shaft frame, and a driving shaft sleeved in the reinforcing cage ring and having its axis line coinciding with the axis line of the reinforcing cage ring, the two ends of the driving shaft being connected with the fixed shaft frame, the present application supports the inner wall of reinforcing rings with different diameters through the cooperation of the clamping jaws and the supporting arms, specifically, all the clamping jaws are directly rotated at the fixed shaft sleeve side wall through the rotating end to drive the movable end corresponding to each clamping jaw to be connected with the supporting arm side wall, at this time, all the clamping jaws will support the supporting arms, and the supported supporting arms will support the inner wall of the reinforcing cage ring, so that the reinforcing cage ring will not appear the phenomenon of torsional deformation, and in this process, the clamping jaws can be freely deflected to support the supporting arms with different diameters.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of reinforcing cage preparation, and particularly relates to a welding device based on a supporting ring reinforcing mechanism in a pile cage. BACKGROUND

[0002] When the concrete structure is a columnar or strip-shaped member, the central part does not need to be reinforced, and only the steel bars are arranged under the surface of the concrete member in contact with the air. If this member is independent, the steel bars arranged around the member are pre-made, which is a reinforcing cage. The reinforcing cage needs to be prepared with the help of various auxiliary equipment, such as a welding device.

[0003] In the prior art, for example, patent literature with the application number CN201721200855.4 discloses a road and bridge pile cage hoop reinforcing automatic welding device. A side pushing oil cylinder is arranged in the rack, a translation rack is arranged at the upper part, a fixed sleeve and a rotating shaft are arranged in the rack, an arc-shaped rack is installed at the lower part of the rotating shaft, a rotating disc is connected at the other end, a fixed plate and a lifting oil cylinder are connected at the upper part of the rotating disc, a hoop reinforcing slot is arranged at the upper part of the lifting oil cylinder, a hoop reinforcing limiting plate is fixed at the top of the rotating disc, a welding machine fixing frame and a two-way welding machine are installed on the rack, and two adjusting lead screws are installed at the lower part of the rotating disc. The utility model discloses a road and bridge pile cage hoop reinforcing automatic welding device which overcomes the technical defects existing in the current manual operation of welding pile cage hoop reinforcing, does not need professional technical welders, is simple and convenient to operate, has high welding speed and efficiency, and has full, uniform and beautiful welding seams, saves human resources, realizes the automation of the electric welding process, and is an ideal road and bridge pile cage hoop reinforcing automatic welding device.

[0004] Although the above-mentioned patent literature solves the efficiency problem caused by technical defects, it has limitations when facing the welding of reinforcing cages with different diameters. Because, when some reinforcing cages are welded and assembled, a long steel bar is first wound to form multiple continuous rings (i.e., reinforcing cage rings), and then straight steel bars for fixation are welded inside the rings. During this process, since the reinforcing cage ring is long, the entire reinforcing cage ring needs to be supported when the reinforcing cage ring is fixed. The method recorded in the above-mentioned patent literature is relatively single, and can only fix a certain position, resulting in the subsequent reinforcing cage ring being twisted. Even if multiple fixing points are set for fixation and support, since the lifting oil cylinder and the two adjusting lead screws are used for support, if the diameter of the reinforcing cage ring is large, it is difficult to control the extension of each position that needs to be supported to be the same. Once the extension of the lifting oil cylinder or the adjusting lead screw is too long, the phenomenon of pushing the ring to twist and deform is easy to occur.

[0005] Therefore, the reinforcing cage welding device in the prior art has the problem of how to support the inner wall of the reinforcing cage with different diameters to prevent the reinforcing cage from being twisted and deformed. SUMMARY

[0006] The technical problem solved by the present application is: in order to solve the problem of how to support the inner wall of the reinforcing ring with different diameters so that the reinforcing ring does not appear twisted and deformed, the present application provides a welding device based on the pile foundation cage inner support ring muscle expansion mechanism to solve the above problem.

[0007] The technical solution adopted by the present application to solve its technical problem is: a welding device based on the pile foundation cage inner support ring muscle expansion mechanism, comprising a fixed shaft frame; a bearing frame for bearing a reinforcing cage ring, and the bearing frame is fixedly arranged at the center area of the fixed shaft frame; a driving shaft, the driving shaft is sleeved in the reinforcing cage ring, and the axis of the driving shaft coincides with the axis of the reinforcing cage ring, both ends of the driving shaft are connected with the fixed shaft frame, and the driving shaft can rotate in the reinforcing cage ring; a plurality of support frames, all the support frames are arranged along the side wall of the driving shaft;

[0008] Among them, the support frame comprises a supporting arm for supporting the inner wall of the reinforcing cage ring, a plurality of clamping jaws and a fixed shaft sleeve, the fixed shaft sleeve is detachably fixedly sleeved on the side wall of the driving shaft, and the supporting arm is sleeved on the outside of the driving shaft;

[0009] Each clamping jaw is provided with a rotating end and a movable end, the rotating end of each clamping jaw is rotatably connected with the side wall of the fixed shaft sleeve, and each clamping jaw can be rotated through the rotating end on the side wall of the fixed shaft sleeve to drive the corresponding movable end to be connected with the side wall of the supporting arm;

[0010] When the movable end of each clamping jaw is connected with the side wall of the supporting arm, all the clamping jaws support the supporting arm to force the axis of the supporting arm to coincide with the axis of the driving shaft.

[0011] As a preferred, when the axis of the supporting arm coincides with the axis of the driving shaft, the outer wall of the supporting arm abuts against the inner wall of the reinforcing cage ring;

[0012] The outer side wall of the supporting arm is provided with an abutting groove, and the inner side wall of the supporting arm is provided with a plurality of reinforcing strips.

[0013] As a preferred, the clamping jaw comprises an oil cylinder rotatably connected with the side wall of the fixed shaft sleeve through a rotating shaft, the telescopic end of the oil cylinder is rotatably connected with a supporting strip, one end of the supporting strip away from the oil cylinder is rotatably provided with a chuck connected with the supporting arm, and the side wall of the chuck is provided with a clamping arm groove capable of clamping the supporting arm.

[0014] As a preferred, when the oil cylinder rotates around the rotating shaft and extends the telescopic end to drive the clamping arm groove to clamp the supporting arm, the side surface of the supporting strip away from the driving shaft is flush with the outer side wall of the supporting arm.

[0015] As preferred, the side surface of the chuck away from the driving shaft is an arc surface, and the arc surface is provided with a highest point and two lowest points respectively arranged on both sides of the highest point, and when the arm slot clamps the support arm, the highest point and the two lowest points are in abutment with the inner side wall of the support arm.

[0016] When the telescopic end is not extended, all the chucks are in abutment in sequence.

[0017] As preferred, the welding mechanism is arranged on the side wall of the reinforcement cage ring, and the welding mechanism can simultaneously weld from multiple positions.

[0018] As preferred, the chucks are at least three, and when the three chucks are in abutment in sequence, the central region of the structure formed by the three chucks has an inner cavity, and the width of the inner cavity is smaller than the diameter of the driving shaft.

[0019] As preferred, the value of the slot of the arm slot is greater than the value of the thickness of the support arm.

[0020] As preferred, a passing area is arranged between the reinforcing strip and the inner side wall of the support arm, and the passing area can accommodate the chuck.

[0021] The beneficial effects of the present application are that the present application supports the inner wall of the reinforcement cage ring of different diameters through the cooperation of the clamping jaws and the support arm, specifically, all the clamping jaws are rotated at the side wall of the fixed shaft sleeve through the rotating end to drive the movable end corresponding to each clamping jaw to be connected with the side wall of the support arm, at this time, all the clamping jaws will support the support arm to force the axis of the support arm to coincide with the axis of the driving shaft, and then the supported support arm will support the inner wall of the reinforcement cage ring so that the reinforcement cage ring will not appear the phenomenon of distortion, and in this process, the clamping jaws can be freely deflected to support the support arm of different diameters. BRIEF DESCRIPTION OF DRAWINGS

[0022] The present application will be further described below in combination with the drawings and examples.

[0023] Figure 1 is the overall structure schematic diagram in the present application;

[0024] Figure 2 is the clamping jaw structure schematic diagram in the present application;

[0025] Figure 3 is the position schematic diagram of the welding mechanism in the present application;

[0026] Figure 4 is the fixed shaft sleeve structure schematic diagram in the present application.

[0027] Mark No. 1, fixed shaft stand; 2, bearing frame; 3, driving shaft; 4, support arm; 5, clamping jaw; 6, fixed shaft sleeve; 7, oil cylinder; 8, support strip; 9, chuck; 10, clamping arm slot; 11, welding mechanism; 12, abutting groove; 13, reinforcing strip. Embodiment

[0028] The embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only, for the purpose of explanation, and are not to be understood as a limitation of the present application.

[0029] As shown in the drawings, the present application provides an embodiment of a welding device based on a pile cage inner support ring tensioning mechanism. Figures 1 to 4

[0030] Specifically, the welding device based on a pile cage inner support ring tensioning mechanism comprises

[0031] A fixed shaft stand 1;

[0032] A bearing frame 2 for bearing a steel reinforcement cage ring, and the bearing frame 2 is fixedly arranged at the center region of the fixed shaft stand 1;

[0033] A driving shaft 3, which is sleeved in the steel reinforcement cage ring and the axis of the driving shaft 3 coincides with the axis of the steel reinforcement cage ring, both ends of the driving shaft 3 are connected with the fixed shaft stand 1, and the driving shaft 3 can rotate in the steel reinforcement cage ring;

[0034] A plurality of support frames, all of which are arranged along the side wall of the driving shaft 3;

[0035] Among them, the support frame comprises a support arm 4 for supporting the inner wall of the steel reinforcement cage ring, a plurality of clamping jaws 5, and a fixed shaft sleeve 6, which is detachably fixedly sleeved on the side wall of the driving shaft 3, and the support arm 4 is sleeved on the outside of the driving shaft 3;

[0036] Each clamping jaw 5 is provided with a rotating end and a movable end, and the rotating end of each clamping jaw 5 is rotatably connected with the side wall of the fixed shaft sleeve 6, and each clamping jaw 5 can be rotated through the rotating end on the side wall of the fixed shaft sleeve 6 to drive the corresponding movable end to be connected with the side wall of the support arm 4;

[0037] When the movable end of each clamping jaw 5 is connected with the side wall of the support arm 4, all the clamping jaws 5 support the support arm 4 to force the axis of the support arm 4 to coincide with the axis of the driving shaft 3.

[0038] In the present application, the fixed shaft stand 1 and the bearing frame 2 are welded into an integrated structure. The mounting mode of both ends of the driving shaft 3 is as follows Figure 1 ​As shown, both ends of the driving shaft 3 are arranged on the fixed shaft frame 1, and a driving mechanism such as a motor can be arranged on the fixed shaft frame 1 to drive the driving shaft 3 to rotate, and the rotating end of the claw 5 can be selected in the prior art, for example, an external electric push rod cooperates with multiple stretching drags to achieve.

[0039] In the present application, the diameter of the arm 4 should be adjusted according to the inner diameter of the reinforcement cage ring, and in the specific implementation, the arm 4 can be arranged as a diameter-adjustable circular ring, for example, a telescopic stainless steel hoop in the prior art can also be selected (other forms of hoop need to meet the purpose of adjustable diameter), and the arrangement structure of the arm 4 is the prior art, which will not be described in detail here.

[0040] In the specific use process of the present application, the arm 4 can be supported on the inner wall of the reinforcement cage ring through the cooperation of the claw 5 and the arm 4, specifically, all the claws 5 are rotated at the fixed shaft sleeve 6 side wall through the rotating end to drive the movable end corresponding to each claw 5 to be connected with the side wall of the arm 4, at this time, all the claws 5 will support the arm 4 to force the axis of the arm 4 to coincide with the axis of the driving shaft 3, then the supported arm 4 will support the inner wall of the reinforcement cage ring so that the reinforcement cage ring will not appear the phenomenon of distortion, in this process, the claw 5 can be freely deflected to support the arm 4 of different diameters.

[0041] In order to make the reinforcement cage ring be supported more stably, preferably: when the axis of the arm 4 coincides with the axis of the driving shaft 3, the outer wall of the arm 4 abuts against the inner wall of the reinforcement cage ring; the outer side wall of the arm 4 is provided with an abutting groove 12, and the inner side wall of the arm 4 is provided with a plurality of reinforcing strips 13.

[0042] In the present application, when the arm 4 is not supported, the arm 4 is suspended on the driving shaft 3 under the action of its own gravity, and when the reinforcement cage ring is wound, the arm 4 will be pushed away from the driving shaft 3 by the inner wall of the reinforcement cage ring, specifically, the axis of the arm 4 has a tendency to move towards the direction of coinciding with the axis of the driving shaft 3, but such movement may cause the arm 4 to tilt, and when the claw 5 supports the arm 4, the abutting groove 12 will be clamped in a single ring in the reinforcement cage ring, so that the position of the entire arm 4 will not tilt, and the reinforcing strips 13 arranged can increase the strength of the arm 4, so that even if the force of the claw 5 supporting the arm 4 is large, the arm 4 will not be bent by the claw 5.

[0043] In the present embodiment, the winding of the reinforcement cage ring can be selected as Figure 1 The winding trolley shown in the figure, the winding way of the winding trolley for the reinforcement cage ring is the same as the winding way of the reinforcement cage ring in the prior art.

[0044] In order to complete the support of the steel reinforcement cage ring with different diameters, the claw 5 is further limited, the claw 5 includes an oil cylinder 7 connected with the side wall of the fixed shaft sleeve 6 through a rotating shaft, the telescopic end of the oil cylinder 7 is rotatably connected with a support bar 8, the end of the support bar 8 away from the oil cylinder 7 is rotatably provided with a chuck 9 connected with the support arm 4, and the side wall of the chuck 9 is provided with a clamping arm groove 10 capable of clamping the support arm 4.

[0045] Since the claw 5 is provided with a plurality of, hereinafter, one claw 5 is taken as an example for description:

[0046] When the support arm 4 needs to be supported, the telescopic end of the oil cylinder is directly driven to extend, and then the telescopic end of the oil cylinder 7 extending will pull the support bar 8 and the chuck 9 to move towards the support arm 4 until the clamping arm groove 10 clamps the support arm 4, so that the support of the support arm 4 is completed, and when the inner diameter of the steel reinforcement cage ring is large, the oil cylinder 7 can be driven to deflect to lift the support position of the chuck 9.

[0047] Specifically, since the extension amount of the telescopic end of the oil cylinder 7 is fixed, when the height of the chuck 9 connected with the telescopic end of each oil cylinder 7 is changed, the height of the chuck 9 is changed in the same plane, so that the fixing accuracy of the inner support ring reinforcement can be ensured.

[0048] Specifically referring to Figure 1 , Figure 2 and Figure 4 , in the embodiment, the contraction and expansion of the chuck 9 are realized by three pairs of oil cylinders 7, so that the pile cage with any diameter can meet the purpose of multipurpose, and the oil pipe of the oil cylinder 7 is routed from the inside of the driving shaft 3, and the oil circuit is rotated and communicated through a non-standard rotary joint.

[0049] In the embodiment, the oil cylinder 7 can also be selected as a gas cylinder. The specific setting should be based on the demand.

[0050] The claw 5 for supporting the support arm 4 is further limited, when the oil cylinder 7 rotates around the rotating shaft and the telescopic end extends to drive the clamping arm groove 10 to clamp the support arm 4, the side surface of the support bar 8 away from the driving shaft 3 is flush with the outer side wall of the support arm 4.

[0051] When the clamping arm groove 10 on the support arm 4 clamps the support arm 4, the telescopic end of the oil cylinder 7 pushes the support bar 8 away from the side surface of the driving shaft 3 to be flush with the outer side wall of the support arm 4, at this time, not only the support arm 4 will support the inner wall of the steel reinforcement cage ring, but also all the support bars 8 will support the inner wall of the steel reinforcement cage ring, so that the stability of the steel reinforcement cage ring supported is higher.

[0052] If the chuck 9 shakes when supporting the support arm 4, the chuck 9 is easy to be separated from the support arm 4, so the chuck 9 is further limited, the surface of the chuck 9 far away from the driving shaft 3 is arc-shaped, the arc-shaped surface is provided with a highest point and two lowest points respectively arranged on both sides of the highest point, when the clamping arm groove 10 clamps the support arm 4, the highest point and the two lowest points are in abutment with the inner wall of the support arm 4; when the telescopic end is not extended, all the chucks 9 are in abutment in sequence.

[0053] In the embodiment, the highest point is the arc-shaped convex point of the arc-shaped surface, and the two lowest points are the two ends of the arc-shaped surface.

[0054] When the support arm 4 is in a larger range, if the clamping arm groove 10 clamps the support arm 4, the highest point and the two lowest points on the chuck 9 are in abutment with the inner wall of the support arm 4, so that the support arm 4 is supported by the whole chuck 9, and when the support arm 4 is in a smaller range (the smaller range cannot be smaller than the structure contour formed by the abutment in sequence of all the chucks 9, if it is smaller, the chuck 9 cannot be normally installed), all the chucks 9 are in abutment in sequence, and the highest point on the chuck 9 is in abutment with the inner wall of the support arm 4.

[0055] As can be seen from the above, no matter how the inner diameter of the support arm 4 changes, at least one point on the chuck 9 limits the inner wall of the support arm 4.

[0056] In order to complete the welding work, a welding mechanism 11 arranged on the side wall of the steel cage ring is further included, and the welding mechanism 11 can simultaneously weld from multiple positions.

[0057] The welding mechanism 11 can be selected from an industrial welding robot assembly (a welding robot assembly with a welding head) in the prior art, and a sensor assembly can be arranged above the industrial welding robot assembly to identify the welding position, and an X, Y and Z linkage module is arranged below the industrial welding robot assembly to automatically adjust the position of the welding head, a welding current sensor is arranged to monitor the welding quality, and whether the welding is virtual welding or whether the welding requirement is met is judged.

[0058] Specifically, in order to prevent the chuck 9 from rotating and rubbing with the driving shaft 3 when splicing, the chuck 9 is further limited to at least three, and when the three chucks 9 are in abutment in sequence, the central region of the structure formed by the three chucks 9 has an inner cavity, and the width of the inner cavity is smaller than the diameter of the driving shaft 3, so that the driving shaft 3 rubs with the inner wall of the inner cavity, and the specific structure can be referred to Figure 2 .

[0059] The groove value of the clamping arm groove 10 is greater than the thickness value of the support arm 4, so that the clamping arm groove 10 can clamp the support arm 4 sufficiently.

[0060] The reinforcing strip 13 and the inner side wall of the supporting arm 4 are provided with a passing area, which can accommodate the chuck 9, so as to prevent the chuck 9 from being unable to clamp the supporting arm 4 after the reinforcing strip 13 is installed, and the passing area can also limit the fixing of the chuck 9, so that the supporting force of the supporting arm 4 is more balanced, and the phenomenon that one side is lifted more greatly does not occur.

[0061] Specifically, in actual work, the present application has the following advantages:

[0062] Directly make all the clamping jaws 5 rotate at the fixed shaft sleeve 6 side wall through the rotating end to drive the movable end corresponding to each clamping jaw 5 to be connected with the supporting arm 4 side wall, and Figures 1-4 Directly drive the extension end of the oil cylinder to extend, and then the extended extension end of the oil cylinder 7 will pull the supporting strip 8 and the chuck 9 towards the supporting arm 4, until all the clamping jaws 5 support the supporting arm 4, at this time the axis of the supporting arm 4 coincides with the axis of the driving shaft 3, and the abutting groove 12 clamps a single ring in the steel cage ring, so that the position of the whole supporting arm 4 does not tilt, so the support of the supporting arm 4 is completed, and when the inner diameter of the facing steel cage ring is larger, the oil cylinder 7 can be deflected to lift the support position of the chuck 9.

[0063] Then drive the driving shaft 3 to rotate, and the driving shaft 3 provides rotary power for the rolling and winding action and the action of indexing and rotating the main reinforcement during the rotation of the driving shaft 3.

[0064] Compared with the prior art, the improvements of the present application are as follows:

[0065] 1. The present application supports the inner wall of the steel ring of different diameters through the cooperation of the clamping jaws 5 and the supporting arm 4, specifically, directly make all the clamping jaws 5 rotate at the fixed shaft sleeve 6 side wall through the rotating end to drive the movable end corresponding to each clamping jaw 5 to be connected with the supporting arm 4 side wall, at this time all the clamping jaws 5 will support the supporting arm 4 to force the axis of the supporting arm 4 to coincide with the axis of the driving shaft 3, then the supported supporting arm 4 will support the inner wall of the steel cage ring so that the steel cage ring does not appear the phenomenon of distortion, in this process, the clamping jaws 5 can be freely deflected to support the supporting arm 4 of different diameters.

[0066] 2. Since the extension amount of the extension end of the oil cylinder 7 is fixed, therefore, when the height of each oil cylinder 7 extension end connected chuck 9 is changed, it is changed on the same plane, so that the inner support ring reinforcement fixing precision can be guaranteed.

[0067] 3. The driving shaft 3 can rotate to drive the whole steel cage ring to rotate to adjust the welding position at any time to achieve the purpose of high-precision welding. The driving shaft 3 provides rotary power for the rolling and winding action and the action of indexing and rotating the main reinforcement during the rotation of the driving shaft 3.

[0068] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the terms does not necessarily mean the same embodiment or example. Also, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0069] With the above ideal embodiments according to the present application as the inspiration, through the above description, relevant personnel can certainly make various changes and modifications within the scope of not deviating from the technical idea of the present application. The technical scope of the present application is not limited to the content in the specification, and must be determined according to the scope of claims.

Claims

1. A welding device based on a pile cage support ring tendon tensioning mechanism, characterized in that, Comprising A fixed shaft frame (1); A bearing frame (2) for bearing a reinforcement cage ring, and the bearing frame (2) is fixedly arranged in the central region of the fixed shaft frame (1); A driving shaft (3) is sleeved in the reinforcement cage ring, and the axis of the driving shaft (3) coincides with the axis of the reinforcement cage ring, both ends of the driving shaft (3) are connected with the fixed shaft frame (1), and the driving shaft (3) can rotate in the reinforcement cage ring; A plurality of support frames are arranged along the side wall of the driving shaft (3); The support frame comprises a supporting arm (4) for supporting the inner wall of the reinforcement cage ring, a plurality of clamping claws (5) and a fixed shaft sleeve (6), the fixed shaft sleeve (6) is detachably sleeved on the side wall of the driving shaft (3), and the supporting arm (4) is sleeved outside the driving shaft (3); Each clamping claw (5) is provided with a rotating end and a movable end, the rotating end of each clamping claw (5) is rotatably connected with the side wall of the fixed shaft sleeve (6), and each clamping claw (5) can be rotated through the rotating end to drive the corresponding movable end to be connected with the side wall of the supporting arm (4); When the movable end of each clamping claw (5) is connected with the side wall of the supporting arm (4), all the clamping claws (5) support the supporting arm (4) to force the axis of the supporting arm (4) to coincide with the axis of the driving shaft (3); When the axis of the supporting arm (4) coincides with the axis of the driving shaft (3), the outer wall of the supporting arm (4) abuts against the inner wall of the reinforcement cage ring; The outer wall of the supporting arm (4) is provided with an abutting groove (12), and the inner wall of the supporting arm (4) is provided with a plurality of reinforcing strips (13); The supporting arm (4) is a telescopic stainless steel hoop.

2. The welding apparatus based on the pile cage inner support ring tensioning mechanism according to claim 1, characterized in that: The clamping claw (5) comprises an oil cylinder (7) rotatably connected with the side wall of the fixed shaft sleeve (6) at the end, the telescopic end of the oil cylinder (7) is rotatably connected with a supporting strip (8), one end of the supporting strip (8) away from the oil cylinder (7) is rotatably provided with a chuck (9) connected with the supporting arm (4), and the side wall of the chuck (9) is provided with a clamping arm groove (10) capable of clamping the supporting arm (4).

3. The welding apparatus based on the pile cage inner support ring tensioning mechanism according to claim 2, characterized in that: When the oil cylinder (7) rotates around the rotating shaft and extends the telescopic end to drive the clamping arm groove (10) to clamp the supporting arm (4), the side surface of the supporting strip (8) away from the driving shaft (3) is flush with the outer wall of the supporting arm (4).

4. The welding device based on the support ring reinforcement expansion mechanism in the pile foundation cage according to claim 3, characterized in that: The side surface of the chuck (9) away from the driving shaft (3) is an arc surface, the arc surface is provided with a highest point and two lowest points respectively arranged on both sides of the highest point, and when the clamping arm groove (10) clamps the supporting arm (4), the highest point and the two lowest points abut against the inner wall of the supporting arm (4). When the telescopic end is not extended, all the chucks (9) abut against each other in sequence.

5. The welding apparatus based on the pile cage inner support ring tensioning mechanism according to claim 4, characterized in that: It also comprises a welding mechanism (11) arranged on the side wall of the reinforcement cage ring, and the welding mechanism (11) can simultaneously weld from multiple positions.

6. The welding apparatus based on the pile cage inner support ring tensioning mechanism of claim 4, wherein: The chuck (9) is at least three, and when at least three chucks (9) abut against each other in sequence, the central region of the structure formed by the at least three chucks (9) has an inner cavity, and the width of the inner cavity is not less than the diameter of the driving shaft (3).

7. A welding apparatus based on the expansion of the support ring of the pile cage, according to claim 3 or 4, characterized in that: The slot value of the clamping arm slot (10) is greater than the thickness value of the support arm (4).

8. The welding apparatus based on the pile cage inner support ring tensioning mechanism of claim 1, wherein: The reinforcing strip (13) and the inner wall of the support arm (4) are provided with a passing area, and the passing area can accommodate the chuck (9).

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