Accurate leveling device for installation of overweight embedded part

By designing the central plate and support structure, the lowest side of the heavy-duty embedded parts can be directly detected and adjusted, solving the problems of complex leveling and low precision in existing technologies, and achieving efficient and stable installation of heavy-duty embedded parts.

CN224187210UActive Publication Date: 2026-05-01CONSTR & INSTALLATION ENG THE THIRD ENG GROUP OF CHINA RAILWAY +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
CONSTR & INSTALLATION ENG THE THIRD ENG GROUP OF CHINA RAILWAY
Filing Date
2025-05-23
Publication Date
2026-05-01

AI Technical Summary

Technical Problem

The existing leveling operation for heavy embedded parts is complex and has low precision, making it difficult to maintain installation accuracy. This is especially true when the weight is large, making the operation inconvenient and prone to displacement.

Method used

It adopts a center plate and multiple support legs structure. The lowest side is directly determined by the detection ball and raised by the outer support legs. Combined with the inner support legs and the top rod for centering, it can achieve rapid leveling and stable support.

Benefits of technology

This improved the efficiency and accuracy of leveling heavy embedded parts, reduced repeated measurements and adjustments, and ensured installation accuracy during subsequent welding and fixing.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model belongs to the technical field of overweight embedded part leveling, and particularly relates to an overweight embedded part installation accurate leveling device which comprises a circular center disc, a plurality of inner supporting feet distributed in a central symmetry mode are arranged on the periphery of the center disc, and the inner supporting feet are used for being supported on the upper surface of an overweight embedded part. A plurality of ejector rods distributed in a central symmetry mode are arranged at the bottom of the center disc, the ejector rods can move in the radial direction of the center disc, the ejector rods are used for abutting against the inner side wall of a center hole of the overweight embedded part to enable the center disc and the overweight embedded part to be centered, and a detection ball capable of rolling is arranged on the upper surface of the center disc. A swing rod parallel to the upper surface of the center disc is arranged at the center of the center disc, the detection ball is rotationally arranged on the swing rod in a sleeving mode, and a plurality of outer supporting feet capable of moving in the circumferential direction of the center disc are arranged on the side face of the center disc and can ascend and descend in the height direction. The overweight embedded part leveling device has the advantage that the overweight embedded part leveling operation can be quickly, efficiently and accurately realized.
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Description

Technical Field

[0001] This utility model relates to the field of leveling technology for heavy-duty embedded parts; specifically, this utility model relates to a precise leveling device for installing heavy-duty embedded parts. Background Technology

[0002] In the construction of micro-seismic foundations for large equipment, heavy-duty embedded parts serve as the foundation components for placing the equipment. They are installed on the building foundation through casting. During construction, the heavy-duty embedded parts are fixed to the reinforced concrete foundation by welding before casting. Maintaining the verticality of the heavy-duty embedded parts during fixing requires alignment and leveling. Currently, the leveling method for heavy-duty embedded parts mainly involves repeatedly measuring them with a testing instrument and then adjusting their various positions based on the measured structure. For example, when raising the lower side, shims are placed at the bottom of the heavy-duty embedded part for alignment and support.

[0003] The existing leveling method for heavy embedded parts described above has at least the following drawbacks:

[0004] (1) Adjusting the overweight embedded parts requires repeated measurement and adjustment, which is complicated and inconvenient. In particular, the overweight embedded parts are heavy and it is difficult to move them directly by hand. Other auxiliary tools are also needed.

[0005] (2) When leveling the heavy embedded parts, it is mainly done by placing shims of different numbers or thicknesses on the lower side. Not only is the accuracy of the height affected by the actual thickness of the shims, but the heavy embedded parts are also prone to displacement when the heavy embedded parts are welded to the steel reinforcement foundation, which affects the installation accuracy.

[0006] In view of this, this application provides a precise leveling device for the installation of heavy embedded parts. Utility Model Content

[0007] In view of this, the present invention provides a precise leveling device for the installation of heavy embedded parts, thereby solving or at least alleviating the above-mentioned problems existing in the prior art.

[0008] To achieve the aforementioned objectives, this utility model provides a precise leveling device for installing heavy-duty embedded parts, comprising a circular central disc, with multiple centrally symmetrically distributed inner support legs around the central disc for supporting the upper surface of the heavy-duty embedded part, and multiple centrally symmetrically distributed top rods at the bottom of the central disc for radial displacement. The top rods abut against the inner wall of the central hole of the heavy-duty embedded part to align the central disc with the embedded part. A rolling detection ball is provided on the upper surface of the central disc, and a swing rod parallel to its upper surface is provided at the center of the central disc, with the detection ball rotatably mounted on the swing rod. Multiple external support legs are provided on the side of the central disc for circumferential displacement, and these external support legs can rise and fall in the height direction. When any one of the external support legs moves downwards to support the reinforcing steel foundation, that side of the heavy-duty embedded part can be raised for leveling.

[0009] In the aforementioned precision leveling device for installing heavy-duty embedded parts, optionally, the bottom end of the inner support foot is a hemispherical structure, and the inner support foot is threadedly engaged with the central disc.

[0010] In the aforementioned precision leveling device for installing heavy-duty embedded parts, optionally, a sleeve is installed at the center of the lower surface of the central plate, and a telescopic arm is provided on the outer surface of the sleeve corresponding to each top rod, and the top rod is fixedly installed on the extended end of the telescopic arm.

[0011] In the aforementioned precision leveling device for installing heavy-duty embedded parts, optionally, a cone capable of vertical movement is provided inside the sleeve, the top of the cone is rotatably connected to a central knob that is threaded into the central disc, and the top of the central knob extends above the central disc, with the inner side of the extended end of the telescopic arm contacting the surface of the cone.

[0012] In the aforementioned precision leveling device for installing heavy-duty embedded parts, optionally, a central support is threadedly connected to the center of the central disc, the sleeve is threadedly fitted onto the bottom end of the central support, a central threaded hole is provided at the center of the central support, and the central knob is threadedly engaged with the central threaded hole.

[0013] In the aforementioned precision leveling device for installing heavy-duty embedded parts, optionally, a ball bearing is rotatably mounted on the outer side of the central support, and the inner end of the swing arm is fixed to the top of the inner ring of the ball bearing.

[0014] In the aforementioned precision leveling device for installing heavy-duty embedded parts, optionally, a collar is rotatably sleeved on the outside of the central disc, and horizontal arms corresponding to the outer support feet are equidistantly installed on the collar along the circumferential direction. The outer support feet are installed on the horizontal arms, and a level is provided on the horizontal arms.

[0015] In the aforementioned precision leveling device for installing heavy-duty embedded parts, optionally, the outer end of the swing arm extends to the outer side of the detection ball after penetrating the center of the detection ball, and a positioning plate is fixedly provided at the outer end of the swing arm. A positioning ring capable of lifting and lowering is provided on the upper surface of the central plate. The positioning plate is located directly above the positioning ring, and the positioning ring contacts the positioning plate to fix the position of the detection ball by upward displacement. A positioning rod capable of swinging in the longitudinal plane is provided at the top of the positioning plate, and a positioning groove is provided at the inner end of the middle part of the cross arm for the positioning rod to be inserted after swinging outward.

[0016] In the aforementioned precise leveling device for installing heavy-duty embedded parts, optionally, the outer support foot includes a "U"-shaped bracket, an outer knob, and two pads. The bracket is slidably installed on the outer end of the cross arm in the height direction. The outer knob is threadedly engaged with the outer end of the support arm, and the bottom end of the outer knob passes through the support arm and is rotatably connected to the middle of the bracket. The two pads are threadedly installed on both sides of the lower surface of the bracket, and the two pads are symmetrically distributed with the support arm as the center.

[0017] This utility model's precision leveling device for installing heavy-duty embedded parts can directly detect the lowest position of the heavy-duty embedded parts and lift its lowest side using the highest end of the heavy-duty embedded parts as a fulcrum. While leveling the heavy-duty embedded parts, it also provides stable support for them, which can greatly improve the leveling efficiency and accuracy of the heavy-duty embedded parts. It eliminates the need for repeated measurements and multiple adjustments, making the installation of heavy-duty embedded parts more convenient. Attached Figure Description

[0018] The disclosure of this utility model will become more apparent with reference to the accompanying drawings. It should be understood that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings:

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This utility model Figure 1 Enlarged view of point A in the middle;

[0021] Figure 3 This utility model Figure 1 A partial schematic diagram;

[0022] Figure 4 This utility model Figure 3 A sectional view.

[0023] Attached reference numerals: 1-Center plate; 2-Inner support foot; 3-Top rod; 4-Detection ball; 5-Swing rod; 6-Outer support foot; 6.1-Bracket; 6.2-Outer knob; 6.3-Padded block; 7-Sleeve; 8-Telescopic arm; 9-Cone; 10-Center knob; 11-Center support; 12-Center threaded hole; 13-Ball bearing; 14-Collar; 15-Horizontal arm; 16-Level; 17-Positioning plate; 18-Positioning ring; 19-Positioning rod; 20-Positioning groove. Detailed Implementation

[0024] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0025] like Figures 1 to 4 As shown, this utility model provides a precise leveling device for installing heavy-duty embedded parts, including a circular central disk 1. Multiple centrally symmetrically distributed inner support legs 2 are arranged around the central disk 1, supporting the upper surface of the heavy-duty embedded part. Multiple centrally symmetrically distributed top rods 3 are arranged at the bottom of the central disk 1, capable of radial displacement along the central disk 1. The top rods 3 abut against the inner wall of the central hole of the heavy-duty embedded part, aligning the central disk 1 with the heavy-duty embedded part. A rolling detection ball 4 is arranged on the upper surface of the central disk 1. A swing rod 5 parallel to the upper surface of the central disk 1 is arranged at the center of the central disk 1, with the detection ball 4 rotatably mounted on the swing rod 5. Multiple external support legs 6, capable of displacement along their circumference, are arranged on the side of the central disk 1. The external support legs 6 can rise and fall in the height direction. When any one of the external support legs 6 moves downwards to support the reinforcing steel foundation, that side of the heavy-duty embedded part can be raised for leveling.

[0026] When in use, first use the inner support foot 2 to place the center plate 1 on the heavy embedded part to be leveled. At this time, since the height of the inner support foot 2 is uniform, the center plate 1 can remain parallel to the heavy embedded part. That is, if the heavy embedded part is tilted, the center plate 1 will maintain the same tilt state as the heavy embedded part.

[0027] When placing the center plate 1 onto the heavy-duty embedded part, all the top rods 3 are located in the center hole of the heavy-duty embedded part. Then, the top rods 3 are moved outward synchronously and pressed against the hole wall of the center hole, so that the center plate 1 and the heavy-duty embedded part are aligned and the center plate 1 is fixed on the heavy-duty embedded part.

[0028] Once the center plate 1 is installed, the position of the detection ball 4 indicates the lowest side of the overweight embedded part. Then, move one of the outer support legs 6 to one side of the detection ball 4, and adjust the height of the outer support leg 6 to lift the lowest side of the overweight embedded part upwards. During this process, observe the condition of the detection ball 4. If the detection ball 4 no longer shifts, it indicates that the overweight embedded part has been leveled, thus completing the leveling operation of the overweight embedded part.

[0029] After the heavy embedded parts are leveled, they can be directly welded and fixed to the steel foundation using steel bars.

[0030] In summary, after applying the precision leveling device for installing heavy-duty embedded parts in this embodiment, it is possible to more intuitively determine whether the heavy-duty embedded parts are level by using the detection ball 4, without having to repeatedly measure with a level. At the same time, after leveling, the outer support leg 6 can support the heavy-duty embedded parts in the leveled state, which is convenient for subsequent welding and fixing, thereby improving the efficiency of the leveling operation of the heavy-duty embedded parts.

[0031] In this embodiment, the bottom end of the inner support leg 2 is a hemispherical structure, and the inner support leg 2 is threadedly engaged with the central disc 1. This arrangement ensures that the inner support leg 2 and the heavy-duty embedded part are in point contact, guaranteeing that the central disc 1 remains parallel to the heavy-duty embedded part. Simultaneously, by adjusting the height of the inner support leg 2, the depth to which the top rod 3 is inserted into the central hole of the heavy-duty embedded part can be adjusted, preventing the top rod 3 from being too low and impacting the reinforcing steel foundation.

[0032] In a relatively specific embodiment, a sleeve 7 is installed at the center of the lower surface of the central disk 1. A telescopic arm 8 is provided on the outer surface of the sleeve 7 corresponding to each push rod 3. The push rod 3 is fixedly installed on the extended end of the telescopic arm 8. By extending and retracting the telescopic arm 8, the radial displacement of the push rod 3 along the central disk 1 can be controlled. At the same time, the telescopic arm 8, in conjunction with the sleeve 7, installs the push rod 3 at the bottom of the central disk 1.

[0033] Based on the above, a cone 9 capable of vertical movement is installed inside the sleeve 7. A central knob 10, threadedly engaged with the central disc 1, is rotatably connected to the top of the cone 9, with the top of the central knob 10 extending above the central disc 1. The inner side of the extended end of the telescopic arm 8 contacts the surface of the cone 9. Rotating the central knob 10 causes it to move downwards. As the central knob 10 moves the cone 9 downwards within the sleeve 7, the surface of the cone 9 presses outwards against the extended end of the telescopic arm 8, causing all the push rods 3 to move outwards synchronously. This achieves alignment between the central disc 1 and the heavy-duty embedded part, and simultaneously fixes the central disc 1 to the heavy-duty embedded part on a horizontal plane. Furthermore, the push rods 3 are radially fixed to the central disc 1, ensuring line contact between the push rods 3 and the wall of the central hole in the heavy-duty embedded part.

[0034] Furthermore, a central support 11 is threadedly connected to the center of the central disc 1, and a sleeve 7 is threadedly fitted onto the bottom end of the center support 11. A central threaded hole 12 is provided in the center of the center support 11, and the central knob 10 is threadedly engaged with the central threaded hole 12.

[0035] Specifically, a through hole is provided in the center of the center plate 1, and the center support 11 is threaded into the through hole. By setting the threaded engagement between the center support 11 and the center plate 1, and the threaded engagement between the sleeve 7 and the center support 11, the center support 11, the sleeve 7 and the center plate 1 can be disassembled, so as to facilitate subsequent device maintenance and parts replacement.

[0036] More specifically, a ball bearing 13 is rotatably mounted on the outer side of the central support 11, and the inner end of the rocker arm 5 is fixed to the top of the inner ring of the ball bearing 13.

[0037] In this embodiment, the swing arm 5 forms the lever arm between the detection ball 4 and the rotating ring. When the detection ball 4 is displaced under its own weight, it can drive the rotating ring to make a circular motion through the swing arm 5. At this time, by setting the ball bearing 13, the resistance encountered by the detection ball 4 when moving is reduced, ensuring that the detection ball 4 can detect the tilt of the overweight embedded part with extreme sensitivity and move quickly to the lowest side of the overweight embedded part, so as to realize the effective indication of the tilt state of the overweight embedded part.

[0038] The outer side of the central disk 1 is fitted with a collar 14. A horizontal arm 15, which is equidistant from the outer support leg 6, is installed on the collar 14 along the circumferential direction. The outer support leg 6 is installed on the horizontal arm 15, and a level 16 is installed on the horizontal arm 15.

[0039] In this embodiment, the horizontal arm 15 is fixedly connected to the collar 14, so that when the horizontal arm 15 is rotated so that one of the horizontal arms 15 is parallel to the swing rod 5, the outer support foot 6 on that horizontal arm 15 corresponds to the lowest position of the overweight embedded part. At the same time, a level 16 is provided. During the process of adjusting the outer support foot 6 to the lowest position to raise the lowest position of the overweight embedded part, the level 16 can be directly observed to determine whether the overweight embedded part has been leveled.

[0040] Meanwhile, during the adjustment of the outer support foot 6 corresponding to the lowest position of the overweight embedded part, the remaining outer support feet 6 are kept in a suspended state and have a certain distance from the steel reinforcement foundation. Therefore, during the process of raising the lowest side of the overweight embedded part, the highest side of the overweight embedded part is used as the fulcrum, so that the overweight embedded part will not shift during the leveling process, thereby improving the leveling efficiency of the overweight embedded part.

[0041] Based on the above embodiment, the outer end of the swing arm 5 passes through the center of the detection ball 4 and extends to the outer side of the detection ball 4. A positioning plate 17 is fixedly provided at the outer end of the swing arm 5. A positioning ring 18 that can be raised and lowered is provided on the upper surface of the center plate 1. The positioning plate 17 is located directly above the positioning ring 18. The positioning ring 18 fixes the position of the detection ball 4 by contacting the positioning plate 17 through upward displacement. A positioning rod 19 that can swing in the longitudinal plane is provided at the top of the positioning plate 17. A positioning groove 20 that can be inserted after the positioning rod 19 swings outward is provided at the inner end of the middle part of the cross arm 15.

[0042] After fixing the center plate 1 to the center of the heavy-duty embedded part, the detection ball 4 can be fixed by raising the positioning ring 18 and contacting the positioning plate 17. At this time, when rotating the horizontal arm 15 and moving one of the outer support legs 6 to the lowest side position of the heavy-duty embedded part, the positioning rod 19 is rotated outward so that it is inserted into the positioning groove 20 of the horizontal arm 15. This not only positions the horizontal arm 15 and the outer support leg 6 in the circumferential direction, but also ensures that the horizontal arm 15 located at the lowest side position of the heavy-duty embedded part is parallel to the swing rod 5, so as to ensure that the outer support leg 6 can accurately raise the lowest position of the heavy-duty embedded part and improve the leveling accuracy of the heavy-duty embedded part.

[0043] Specifically, a lifting bolt is rotatably connected to the positioning ring 18. The lifting bolt is threadedly engaged with the central plate 1. Multiple guide rods are also provided on the positioning ring 18. The multiple guide rods and the lifting bolt are centrally symmetrically distributed, and the bottom ends of the guide rods and the lifting bolts extend below the central plate 1. When controlling the lifting of the positioning ring 18, the worker only needs to operate the bottom end of the lifting bolt directly.

[0044] The outer support leg 6 includes a U-shaped bracket 6.1, an outer knob 6.2, and two pads 6.3. The bracket 6.1 is slidably mounted on the outer end of the cross arm 15 in the height direction. The outer knob 6.2 is threadedly engaged with the outer end of the support arm, and the bottom end of the outer knob 6.2 passes through the support arm and is rotatably connected to the middle of the bracket 6.1. The two pads 6.3 are threadedly mounted on both sides of the lower surface of the bracket 6.1, and the two pads 6.3 are symmetrically distributed with the support arm as the center.

[0045] By operating the outer knob 6.2 to control the descent of the bracket 6.1, the pad 6.3 is supported on the steel reinforcement foundation, thus enabling the outer support leg to lift the lowest side of the overweight embedded part. By setting two pads 6.3, the balance of the overweight embedded part can be maintained when lifting the lowest side of the overweight embedded part, preventing the overweight embedded part from tilting.

[0046] Meanwhile, by setting the pad 6.3 to be threadedly engaged with the bracket 6.1, the height of the two pads 6.3 on the bracket 6.1 can be adjusted to accommodate the height deviation of the steel foundation. This allows the leveling operation of the heavy embedded parts to effectively avoid the height error of the steel foundation. At the same time, the two-point support provided by the two pads 6.3 can improve the stability of supporting the heavy embedded parts.

[0047] In addition, after the heavy-duty embedded parts are leveled, the remaining external support feet 6 are adjusted to support the steel reinforcement foundation, which can maintain the stability of the heavy-duty embedded parts before welding them to the steel reinforcement foundation.

[0048] In summary, after applying the precision leveling device for installing heavy-duty embedded parts according to this embodiment, the lowest side of the heavy-duty embedded part can be raised by using the highest side of the heavy-duty embedded part as a fulcrum, and the balance of the heavy-duty embedded part can be maintained during the raising process. This allows the heavy-duty embedded part to be leveled directly without repeated measurement and adjustment, which can greatly improve the efficiency and accuracy of the leveling operation of the heavy-duty embedded part. In addition, it can stably support the heavy-duty embedded part, keeping it in a leveled state, ensuring that the heavy-duty embedded part will not shift during subsequent welding and fixing operations, and ensuring the installation accuracy of the heavy-duty embedded part.

[0049] The technical scope of this utility model is not limited to the contents of the above description. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this utility model, and all such modifications and variations should fall within the scope of this utility model.

Claims

1. A precise leveling device for installing heavy-duty embedded parts, characterized in that, The device includes a circular central disc (1), around which multiple centrally symmetrically distributed inner support legs (2) are provided. These inner support legs (2) support the upper surface of the heavy-duty embedded part. At the bottom of the central disc (1) are multiple centrally symmetrically distributed top rods (3). These top rods (3) are capable of radial displacement along the central disc (1). The top rods (3) abut against the inner wall of the central hole of the heavy-duty embedded part, aligning the central disc (1) with the heavy-duty embedded part. The upper surface is provided with a rolling detection ball (4), and the center of the central disk (1) is provided with a swing rod (5) parallel to its upper surface. The detection ball (4) is rotatably sleeved on the swing rod (5). The side of the central disk (1) is provided with multiple outer support feet (6) that can move along its circumference. The outer support feet (6) can rise and fall in the height direction. When any one of the outer support feet (6) moves downward and supports the steel reinforcement foundation, it can raise that side of the overweight embedded part for leveling the overweight embedded part.

2. The precise leveling device for installing heavy-duty embedded parts according to claim 1, characterized in that, The bottom end of the inner support foot (2) is a hemispherical structure, and the inner support foot (2) is threadedly engaged with the central disk (1).

3. The precise leveling device for installing heavy-duty embedded parts according to claim 1, characterized in that, A sleeve (7) is installed at the center of the lower surface of the central disk (1). A telescopic arm (8) is provided on the outer surface of the sleeve (7) corresponding to each top rod (3). The top rod (3) is fixedly installed on the extended end of the telescopic arm (8).

4. The precise leveling device for installing heavy-duty embedded parts according to claim 3, characterized in that, The sleeve (7) is provided with a cone (9) that can move up and down in the height direction. The top of the cone (9) is rotatably connected to a central knob (10) that is threaded into the central disk (1). The top of the central knob (10) extends above the central disk (1). The inner side of the extended end of the telescopic arm (8) contacts the surface of the cone (9).

5. The precise leveling device for installing heavy-duty embedded parts according to claim 4, characterized in that, The center plate (1) is threadedly connected to a center support (11) in the middle. The sleeve (7) is threadedly fitted onto the bottom end of the center support (11). The center support (11) has a center threaded hole (12) in the center. The center knob (10) is threadedly engaged with the center threaded hole (12).

6. The precise leveling device for installing heavy-duty embedded parts according to claim 5, characterized in that, A ball bearing (13) is rotatably mounted on the outer side of the central support (11), and the inner end of the rocker arm (5) is fixed to the top of the inner ring of the ball bearing (13).

7. The precise leveling device for installing heavy-duty embedded parts according to claim 1, characterized in that, The outer side of the central disk (1) is fitted with a collar (14), and the collar (14) is equidistantly mounted with horizontal arms (15) corresponding to the outer support feet (6) along the circumferential direction. The outer support feet (6) are mounted on the horizontal arms (15), and a level (16) is provided on the horizontal arms (15).

8. The precise leveling device for installing heavy-duty embedded parts according to claim 7, characterized in that, The outer end of the swing arm (5) passes through the center of the detection ball (4) and extends to the outer side of the detection ball (4). A positioning plate (17) is fixedly provided on the outer end of the swing arm (5). A positioning ring (18) that can be raised and lowered is provided on the upper surface of the central disk (1). The positioning plate (17) is located directly above the positioning ring (18). The positioning ring (18) fixes the position of the detection ball (4) by contacting the positioning plate (17) by moving upward. A positioning rod (19) that can swing in the longitudinal plane is provided on the top of the positioning plate (17). A positioning groove (20) is provided on the inner end of the middle part of the cross arm (15) for the positioning rod (19) to be inserted after swinging outward.

9. A precise leveling device for installing heavy-duty embedded parts according to claim 7, characterized in that, The outer support leg (6) includes a U-shaped bracket (6.1), an outer knob (6.2), and two pads (6.3). The bracket (6.1) is slidably mounted on the outer end of the cross arm (15) in the height direction. The outer knob (6.2) is threadedly engaged with the outer end of the support arm, and the bottom end of the outer knob (6.2) passes through the support arm and is rotatably connected to the middle of the bracket (6.1). The two pads (6.3) are threadedly mounted on both sides of the lower surface of the bracket (6.1), and the two pads (6.3) are symmetrically distributed with the support arm as the center.