A pre-embedded sleeve positioning device

Abstract

The application relates to the technical field of building construction, in particular to a pre-buried sleeve positioning device which comprises a positioning sleeve, a driving ring, a positioning assembly and a fixing assembly. The positioning assembly comprises a first ring-shaped piece and a second ring-shaped piece, and the first ring-shaped piece and the second ring-shaped piece can slide along the axial direction of the positioning sleeve. At least two connecting pieces are fixedly installed on the first ring-shaped piece and the second ring-shaped piece at equal intervals in the circumferential direction, the connecting pieces are hinged with connecting rods, the free ends of the corresponding two connecting rods are commonly hinged with a supporting column, and the hinge points of the corresponding two connecting rods and the supporting column are located at the two ends of the supporting column. The fixing assembly is arranged at the end of the positioning sleeve and is used for connecting a bottom die. When used, the supporting column in the positioning assembly is driven through the driving ring to tightly abut against the inner wall of the pre-buried sleeve, so that the positioning sleeve and the pre-buried sleeve are fixed together, the lower end of the supporting column abuts against the bottom die to form a support, the pre-buried sleeve is prevented from tilting, and the positioning accuracy and stability are improved.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, and specifically to a pre-embedded sleeve positioning device. Background Technology

[0002] In the electromechanical installation of buildings, pipelines need to pass vertically through each floor slab. Therefore, it is necessary to pre-embed sleeves in the floor slabs to ensure that the pipelines can pass through smoothly.

[0003] The current method for constructing embedded sleeves mainly involves placing the embedded sleeves at predetermined positions on the erected bottom formwork before pouring the floor slab of the upper floor. After pouring the concrete, the embedded sleeves are then removed to create the embedded holes for the pipes. To ensure the accuracy of the embedded hole positions, a method for positioning embedded sleeves is currently available. First, the outer circle position of the embedded sleeve is drawn on a wooden formwork. Then, multiple screws with thin steel wires are evenly driven into the wooden formwork at the outer circle position of the embedded sleeve. The embedded sleeve is placed between these screws, and then the screws are twisted together at the top of the embedded sleeve to fix it to the bottom formwork.

[0004] However, current installation methods for embedded sleeves have some drawbacks. Using steel wire binding for fixation can lead to displacement during concrete pouring due to concrete impact and the influence of vibrators. This can cause cumulative errors in the position of the embedded sleeves between floors, further amplifying the deviation. Furthermore, steel wire fixing requires construction workers to install screws and wrap the steel wire, making the process complex. Summary of the Invention

[0005] The purpose of this invention is to provide a pre-embedded sleeve positioning device, which aims to improve the accuracy and stability of pre-embedded sleeve positioning.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a pre-embedded sleeve positioning device, comprising:

[0007] Positioning sleeve with external threads;

[0008] A drive ring is sleeved on the positioning sleeve, and the drive ring is threadedly connected to the positioning sleeve.

[0009] The positioning assembly includes a first annular component and a second annular component, both of which are sleeved on the positioning sleeve. Both the first and second annular components can slide along the axial direction of the positioning sleeve. The first annular component is located between the driving ring and the second annular component. At least two connecting components are fixedly installed at equal intervals along the circumferential direction on both the first and second annular components. The connecting components on the first annular component correspond one-to-one with the connecting components on the second annular component. The connecting components are hinged to connecting rods. The free ends of the corresponding two connecting rods are hinged to a support column. The hinge points of the corresponding two connecting rods and the support column are located at the two ends of the support column, respectively.

[0010] A fixing component is disposed on one end of the positioning sleeve near the second annular component, and the fixing component is used to connect the bottom mold.

[0011] The present invention is further configured such that the positioning component includes an adjusting bolt and a positioning post, the support post has a positioning through hole that passes through the upper and lower ends of the support post, the positioning post is movably installed in the positioning through hole, and the lower section of the adjusting bolt is threadedly connected in the positioning through hole. When the adjusting bolt moves downward, it can push the lower end of the positioning post out of the positioning through hole.

[0012] The present invention is further configured such that the positioning through hole has an expanding section and a reducing section arranged sequentially from top to bottom, the diameter of the expanding section is larger than the diameter of the reducing section, the diameter of the positioning post matches the diameter of the reducing section, and the upper end of the positioning post has a limiting head, the outer diameter of the limiting head being larger than the diameter of the reducing section.

[0013] The present invention is further configured such that a first reset spring is sleeved on the positioning post, the first reset spring is located inside the expanded diameter section, one end of the first reset spring abuts against the limiting head, and the other end abuts against the upper end of the reduced diameter section.

[0014] The present invention is further configured such that a protective sleeve is connected to the lower end of the positioning post, and the protective sleeve is located outside the positioning through hole.

[0015] The present invention is further configured such that the fixing component includes a transmission rod and a connector. The transmission rod passes through the positioning sleeve, and a movable pin is connected to the lower end of the transmission rod. The lower end of the movable pin is tapered. The connector is tubular, and the upper section of the connector is threaded to the inner side of the lower end of the positioning sleeve. The lower section of the connector is located outside the positioning sleeve. A mounting through hole is formed on the side of the lower section of the connector along its diameter direction. A positioning pin passes through the mounting through hole. One end of the positioning pin located inside the connector has a first limiting part. A second return spring is sleeved on the positioning pin. The two ends of the second return spring abut against the first limiting part and the connector, respectively. The positioning pin has a first working position and a second working position. When the positioning pin is in the first working position, the first limiting part abuts against the tapered part of the movable pin, and the end of the positioning pin away from the first limiting part is located inside the mounting through hole. When the positioning pin is in the second working position, the first limiting part abuts against the movable pin, and the end of the positioning pin away from the first limiting part is located outside the mounting through hole.

[0016] The present invention is further configured such that the upper end of the movable pin has a second limiting part, the second limiting part abuts against the lower end of the transmission rod, and a third return spring is sleeved on the movable pin, the two ends of the third return spring abutting against the second limiting part and the connecting head respectively.

[0017] The invention is further configured such that the upper section of the transmission rod is provided with a limiting pin, and the inner side of the positioning sleeve is provided with a limiting groove for the limiting pin to pass through. The limiting groove has a vertical section and a horizontal section. The vertical section forms an opening at the upper end of the positioning sleeve, and the horizontal section is opened along the circumferential direction of the positioning sleeve. When the positioning pin is located in the first working position, the limiting pin is located in the vertical section. When the positioning pin is located in the second working position, the limiting pin is located in the horizontal section.

[0018] The present invention is further configured such that a limit cover is threadedly connected to the outer side of the upper end of the positioning sleeve, and the limit cover is provided with a limit through hole for the transmission rod to pass through.

[0019] The present invention is further configured such that a pull ring is fixedly connected to the upper end of the transmission rod, and the pull ring is located outside the positioning sleeve.

[0020] In summary, the pre-embedded sleeve positioning device provided by the present invention has at least the following beneficial effects:

[0021] 1. By driving the support column in the positioning assembly through the drive ring, the pre-embedded sleeve can be pressed against the inner wall of the pre-embedded sleeve to fix the positioning sleeve and the pre-embedded sleeve together. The positioning speed is fast and the operation is simple.

[0022] 2. It can be adapted to pre-embedded sleeves of different pipe diameters, making it convenient and practical.

[0023] 3. Improved the overturning resistance of the embedded sleeve, preventing it from tilting during concrete pouring. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any novel effort.

[0025] Figure 1 This is a three-dimensional structural diagram of an embodiment;

[0026] Figure 2 This is a front view of an embodiment;

[0027] Figure 3 yes Figure 2 Sectional view at point AA;

[0028] Figure 4 yes Figure 3 An enlarged view of point a in the middle;

[0029] Figure 5 yes Figure 3 A magnified view at point b in the middle;

[0030] Figure 6 This is a three-dimensional structural diagram of the positioning component in the embodiment;

[0031] Figure 7 This is an exploded view of the positioning component in the embodiment;

[0032] Figure 8 This is a schematic diagram of the assembly of the fixing component and the positioning sleeve in the embodiment;

[0033] Figure 9 This is an exploded view of the fixing component and positioning sleeve in the embodiment;

[0034] Figure 10 This is an assembly diagram of the movable pin, connector, positioning pin, and third return spring in the fixed component of the embodiment;

[0035] Figure 11 This is a front view of the assembly of the movable pin, connector, locating pin, and third return spring in the fixed component;

[0036] Figure 12 yes Figure 11 Sectional view at point BB;

[0037] Figure 13 This is a cross-sectional view of the locating pin at point BB in section 11 when the locating pin is in the second working position;

[0038] Figure 14 yes Figure 9 A magnified view of point c in the middle.

[0039] In the diagram: 1. Positioning sleeve; 2. Drive ring; 3. Positioning assembly; 3. First annular component; 301. Second annular component; 302. Connector; 303. Connecting rod; 304. Support column; 305. Bolt mounting hole; 306. Connecting bolt; 307. Fourth return spring; 308. Adjusting bolt; 309. Positioning column; 310. Positioning through hole; 311. Limiting head; 312. First return spring; 313. Protective sleeve; 314. Fixing assembly; 4. Transmission rod; 401. Connecting head; 402. Movable pin; 403. Mounting through hole; 404. Positioning pin; 405. First limiting part; 406. Second return spring; 407. Flange; 408. Second limiting part; 409. Third return spring; 410. Limiting pin; 411. Limiting groove; 5. Limiting cover; 6. Limiting through hole; 7. Pull ring; 8. Detailed Implementation

[0040] To enable those skilled in the art to better understand the technical solution of the present invention, the following description is provided in conjunction with the appendix. Figure 1-14 The present invention will be further described in detail below with reference to specific embodiments.

[0041] Please see Figure 1-4 This invention provides a pre-embedded sleeve positioning device, comprising: a positioning sleeve 1, a driving ring 2, a positioning assembly 3, and a fixing assembly 4. The positioning sleeve 1 has external threads, and its lower end has internal threads. The driving ring 2 is sleeved on the positioning sleeve 1 and threadedly connected to it. The positioning assembly 3 includes a first annular member 301 and a second annular member 302, both sleeved on the positioning sleeve 1. Both the first annular member 301 and the second annular member 302 can slide along the axial direction of the positioning sleeve 1. The driving ring 2, the first annular member 301, and the second annular member 302 are arranged sequentially from top to bottom. At least two connecting members 303 are fixedly installed at equal intervals along the circumferential direction on both the first annular member 301 and the second annular member 302, with each connecting member 303 on the first annular member 301 corresponding one-to-one with the connecting member 303 on the second annular member 302. Connector 303 is hinged to connecting rod 304, with the upper and lower corresponding connecting rods 304 having the same length. The free ends of the corresponding upper and lower connecting rods 304 are hinged to support column 305, and the hinge points of the corresponding upper and lower connecting rods 304 and support column 305 are located at the upper and lower ends of support column 305, respectively. Fixing component 4 is located at the lower end of positioning sleeve 1, and fixing component 4 is used to connect the bottom mold.

[0042] Initially, the first annular component 301 and the second annular component 302 are far apart, and the support column 305 is close to the positioning sleeve 1 for easy storage. In use, the installation center is marked on the bottom mold, and the center of the pre-embedded sleeve is roughly aligned with the installation center. It is then connected to the bottom mold via the fixing component 4. The driving ring 2 moves the first annular component 301 closer to the second annular component 302, causing the support column 305 to press against the inner wall of the pre-embedded sleeve, thus fixing the pre-embedded sleeve and the positioning sleeve 1 together. Because at least two support columns 305, evenly spaced along the circumference, press against the inner wall of the pre-embedded sleeve, during positioning, the support columns 305 drive the center of the pre-embedded sleeve to align with the center of the positioning sleeve 1, resulting in accurate and rapid positioning. During use, to prevent the embedded sleeve from shifting due to the lateral pressure of the concrete and the influence of the vibrator during concrete pouring, as the drive ring 2 drives the first annular component 301 closer to the second annular component 302, it is preferable to adjust the two corresponding connecting rods 304 to a parallel state, and tilt the end of the connecting rod 304 away from the positioning sleeve 1 downwards. The support column 305 abuts against the bottom mold, providing support and enhancing the resistance to bending moments generated by lateral impact on the positioning sleeve 1, thereby improving its anti-overturning capability. When the corresponding upper and lower connecting rods 304 are in a parallel state, and the end of the connecting rod 304 away from the positioning sleeve 1 is pointing downwards, moving the drive ring 2 upwards reduces the support spacing, and moving the drive ring 2 downwards expands the support spacing, thus adapting to embedded sleeves of different diameters for convenience and practicality.

[0043] Please continue to refer to Figure 1 To improve the stability of the support, preferably, three connectors 303 are evenly spaced along the circumference on both the first annular member 301 and the second annular member 302, with an included angle of 120° between adjacent connectors 303. Corresponding connecting rods 304 and support columns 305 are added accordingly. Six bolt mounting holes 306, penetrating both ends, are evenly spaced along the circumference on both the first and second annular members 301 and 302. In practical use, the number of connectors 303 can be increased as needed. Connectors 303 are connected to their respective first and second annular members 301 and 302 via connecting bolts 307, which pass through the corresponding bolt mounting holes 306 for easy installation and removal. A fourth return spring 308 is fitted onto the positioning sleeve 1 between the first and second annular members 301 and 302, facilitating the movement of the first annular member 301 away from the second annular member 302.

[0044] Please see Figure 1 , Figure 3 , Figure 4 , Figure 6 and Figure 7Because it is difficult to achieve a perfectly level bottom formwork during installation, and because wooden formwork deforms after repeated use, the embedded sleeve is prone to remaining tilted when using the bottom formwork for positioning. To ensure the embedded sleeve is vertical, the positioning assembly 3 further includes an adjusting bolt 309 and a positioning post 310. A positioning through hole 311 is provided on the support post 305, extending through both the upper and lower ends of the support post 305. The positioning post 310 is movably installed within the positioning through hole 311. The lower section of the adjusting bolt 309 is threaded into the positioning through hole 311. When the adjusting bolt 309 moves downwards, it pushes the lower end of the positioning post 310 out of the positioning through hole 311. In use, the lower end of the positioning post 310 extends by adjusting the bolt 309, and the angle of the embedded sleeve is adjusted using the reaction force of the bottom formwork on the positioning post 310, thus ensuring the embedded sleeve is vertical. When using it, it is preferable to use three equally spaced positioning posts 310 to adjust the angle of the embedded sleeve, so as to achieve the accuracy of adjusting the embedded sleeve to the vertical angle.

[0045] Please continue reading. Figure 4 and Figure 7 To prevent the positioning pin 310 from disengaging downwards from the positioning through hole 311 and to facilitate the repositioning of the positioning pin 310, the positioning through hole 311 has an expanding section and a reducing section arranged sequentially from top to bottom. The diameter of the expanding section is larger than the diameter of the reducing section. The expanding section has internal threads, and the inner surface of the reducing section is smooth. The diameter of the positioning pin 310 matches the diameter of the reducing section. The upper end of the positioning pin 310 has a limiting head 312, the outer diameter of which is larger than the diameter of the reducing section. A first return spring 313 is sleeved on the positioning pin 310. The first return spring 313 is located inside the expanding section, with its upper end abutting against the limiting head 312 and its lower end abutting against the upper end of the reducing section. To prevent the positioning pin 310 from damaging the bottom mold, a protective sleeve 314 is connected to the lower end of the positioning pin 310. The protective sleeve 314 is located outside the positioning through hole 311, and its diameter is larger than that of the positioning pin 310, increasing the contact surface with the bottom mold. The protective sleeve 314 can be made of rubber and is cap-shaped, fitted onto the lower end of the positioning pin 310.

[0046] Please see Figure 3 , Figure 5 as well as Figure 8-13In some embodiments, the fixing component 4 includes a transmission rod 401 and a connector 402. The transmission rod 401 passes through the positioning sleeve 1. A movable pin 403 is connected to the lower end of the transmission rod 401, and the lower end of the movable pin 403 is tapered. The connector 402 is tubular, with its upper section threaded to the inner side of the lower end of the positioning sleeve 1, and its lower section located outside the positioning sleeve 1. A mounting through hole 404 is provided on the side of the lower section of the connector 402 along its diameter direction. Preferably, there are three mounting through holes 404, which are evenly spaced along the circumference. A positioning pin 405 passes through the mounting through hole 404. One end of the positioning pin 405 located inside the connector 402 has a first limiting part 406. A second return spring 407 is sleeved on the positioning pin 405, and both ends of the second return spring 407 abut against the first limiting part 406 and the connector 402, respectively. The positioning pin 405 has a first working position and a second working position. When the positioning pin 405 is in the first working position, the first limiting part 406 abuts against the tapered portion of the movable pin 403, and the end of the positioning pin 405 away from the first limiting part 406 is located inside the mounting through hole 404. When the positioning pin 405 is in the first working position, the receiving space formed by the first limiting parts 406 corresponding to the three positioning pins 405 allows the tip of the movable pin 403 to be inserted, facilitating the inclined surface formed on the outer side of the tip of the movable pin 403 to drive the three positioning pins 405 to the second working position. When the positioning pin 405 is in the second working position, the first limiting part 406 abuts against the movable pin 403, and the end of the positioning pin 405 away from the first limiting part 406 is located outside the mounting through hole 404. In use, a positioning hole is first made on the bottom mold. After the connector 402 passes through the positioning hole, the transmission rod 401 drives the movable pin 403 to move downward, thereby causing the movable pin 403 to push one end of the positioning pin 405 outward. The positioning pin 405 hooks onto the lower surface of the bottom mold, thus preventing the positioning sleeve 1 from detaching from the bottom mold upward. To facilitate the installation of the second return spring 407 and to ensure the length of the positioning pin 405 extending beyond the mounting through hole 404, the lower end of the connector 402 has an annular flange 408. The outer diameter of the flange 408 is larger than the outer diameter of the upper section of the connector 402. The mounting through hole 404 horizontally penetrates the flange 408. The mounting through hole 404 has a first diameter section and a second diameter section sequentially from the inside to the outside of the connector 402. The diameter of the first diameter section is larger than the diameter of the second diameter section. One end of the second return spring 407 abuts against the first limiting part 406, and the other end abuts against the step formed at the junction of the first and second diameter sections. For ease of use, the outer diameter of the flange 408 is larger than the outer diameter of the positioning sleeve 1, thereby preventing the second annular part 302 from disengaging downward from the positioning sleeve 1.

[0047] Please continue reading. Figure 5To facilitate the installation and reset of the movable pin 403, the upper end of the movable pin 403 is further provided with a second limiting part 409, which abuts against the lower end of the transmission rod 401. A third reset spring 410 is sleeved on the movable pin 403, and the two ends of the third reset spring 410 abut against the second limiting part 409 and the connector 402, respectively.

[0048] Please see Figure 8 , Figure 9 and Figure 14 To facilitate the fixing of the transmission rod 401 and the positioning sleeve 1 when the positioning pin 405 is in the second working position, a limiting pin 411 is provided on the upper section of the transmission rod 401. A limiting groove 5 for the limiting pin 411 to pass through is provided on the inner side of the positioning sleeve 1. The limiting groove 5 has a vertical section and a horizontal section. The vertical section forms an opening at the upper end of the positioning sleeve 1, and the horizontal section is opened along the circumference of the positioning sleeve 1. When the positioning pin 405 is in the first working position, the limiting pin 411 is in the vertical section. When the positioning pin 405 is in the second working position, the limiting pin 411 is in the horizontal section. To prevent the transmission rod 401 from detaching upward from the positioning sleeve 1, a limiting cover 6 is threadedly connected to the outer side of the upper end of the positioning sleeve 1. The limiting cover 6 has a limiting through hole 7 for the transmission rod 401 to pass through.

[0049] Please continue reading. Figure 1 To facilitate gripping of the transmission rod 401, a pull ring 8 is fixedly connected to the upper end of the transmission rod 401, and the pull ring 8 is located outside the positioning sleeve 1.

[0050] It should be noted that words indicating direction in this article, such as "up" and "down," are all in the format of "upper" and "lower." Figure 1 The direction setting is for ease of description only and has no other specific meaning.

[0051] It should also be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or apparatus comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or apparatus that includes the aforementioned element.

[0052] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A pre-embedded sleeve positioning device, characterized in that, include: Positioning sleeve (1) has external threads; A drive ring (2) is sleeved on the positioning sleeve (1), and the drive ring (2) is threadedly connected to the positioning sleeve (1); The positioning component (3) includes a first annular member (301) and a second annular member (302). Both the first annular member (301) and the second annular member (302) are sleeved on the positioning sleeve (1). Both the first annular member (301) and the second annular member (302) can slide along the axial direction of the positioning sleeve (1). The first annular member (301) is located between the driving ring (2) and the second annular member (302). Both the first annular member (301) and the second annular member (302) are circumferentially oriented. At least two connectors (303) are fixedly installed at equal intervals. The connectors (303) on the first annular member (301) correspond one-to-one with the connectors (303) on the second annular member (302). The connectors (303) are hinged to connecting rods (304). The free ends of the two corresponding connecting rods (304) are hinged to a support column (305). The hinge points of the two corresponding connecting rods (304) and the support column (305) are located at the upper and lower ends of the support column (305), respectively. The positioning assembly (3) further includes an adjusting bolt (309) and a positioning post (310). The support post (305) has a positioning through hole (311) that passes through the upper and lower ends of the support post (305). The positioning post (310) is movably installed in the positioning through hole (311). The lower section of the adjusting bolt (309) is threaded into the positioning through hole (311). When the adjusting bolt (309) moves downward, it can push the lower end of the positioning post (310) out of the positioning through hole (311). A fixing component (4) is provided on one end of the positioning sleeve (1) near the second annular part (302), and the fixing component (4) is used to connect the bottom mold; The fixing component (4) includes a transmission rod (401) and a connector (402). The transmission rod (401) passes through the positioning sleeve (1). A movable pin (403) is connected to the lower end of the transmission rod (401). The lower end of the movable pin (403) is tapered. The connector (402) is tubular. The upper section of the connector (402) is threaded to the inner side of the lower end of the positioning sleeve (1). The lower section of the connector (402) is located outside the positioning sleeve (1). A mounting through hole (404) is opened on the side of the lower section of the connector (402) along its diameter direction. A positioning pin (405) passes through the mounting through hole (404). One end of the positioning pin (405) located inside the connector (402) has a first limiting part (406). The positioning pin (405) has a first limiting part (406) on its upper end. A second return spring (407) is sleeved on the device. The two ends of the second return spring (407) abut against the first limiting part (406) and the connector (402) respectively. The positioning pin (405) has a first working position and a second working position. When the positioning pin (405) is in the first working position, the first limiting part (406) abuts against the conical part of the movable pin (403). The end of the positioning pin (405) away from the first limiting part (406) is located inside the mounting through hole (404). When the positioning pin (405) is in the second working position, the first limiting part (406) abuts against the movable pin (403). The end of the positioning pin (405) away from the first limiting part (406) is located outside the mounting through hole (404).

2. The pre-embedded sleeve positioning device as described in claim 1, characterized in that, The positioning through hole (311) has an expanding section and a reducing section arranged sequentially from top to bottom. The diameter of the expanding section is larger than the diameter of the reducing section. The diameter of the positioning post (310) matches the diameter of the reducing section. The upper end of the positioning post (310) has a limiting head (312). The outer diameter of the limiting head (312) is larger than the diameter of the reducing section.

3. The pre-embedded sleeve positioning device as described in claim 2, characterized in that, A first reset spring (313) is sleeved on the positioning post (310). The first reset spring (313) is located inside the expanded diameter section. One end of the first reset spring (313) abuts against the limiting head (312), and the other end abuts against the upper end of the reduced diameter section.

4. The pre-embedded sleeve positioning device as described in claim 2 or 3, characterized in that, The lower end of the positioning post (310) is connected to a protective sleeve (314), which is located outside the positioning through hole (311).

5. The pre-embedded sleeve positioning device as described in claim 1, characterized in that, The upper end of the movable pin (403) has a second limiting part (409), which abuts against the lower end of the transmission rod (401). A third return spring (410) is sleeved on the movable pin (403), and the two ends of the third return spring (410) abut against the second limiting part (409) and the connector (402) respectively.

6. The pre-embedded sleeve positioning device as described in claim 5, characterized in that, The upper section of the transmission rod (401) is provided with a limiting pin (411), and the inner side of the positioning sleeve (1) is provided with a limiting groove (5) for the limiting pin (411) to pass through. The limiting groove (5) has a vertical section and a horizontal section. The vertical section forms an opening at the upper end of the positioning sleeve (1), and the horizontal section is opened along the circumferential direction of the positioning sleeve (1). When the positioning pin (405) is located in the first working position, the limiting pin (411) is located in the vertical section. When the positioning pin (405) is located in the second working position, the limiting pin (411) is located in the horizontal section.

7. The pre-embedded sleeve positioning device as described in claim 6, characterized in that, The upper outer side of the positioning sleeve (1) is threaded with a limiting cover (6), and the limiting cover (6) is provided with a limiting through hole (7) for the transmission rod (401) to pass through.

8. The pre-embedded sleeve positioning device as described in any one of claims 5-7, characterized in that, A pull ring (8) is fixedly connected to the upper end of the transmission rod (401), and the pull ring (8) is located outside the positioning sleeve (1).

9. The pre-embedded sleeve positioning device as described in claim 1, characterized in that, The first annular member (301) and the second annular member (302) each have three connectors (303) spaced at equal intervals along the circumferential direction.

10. The pre-embedded sleeve positioning device as described in claim 1, characterized in that, A fourth return spring (308) is fitted on the positioning sleeve (1) between the first annular member (301) and the second annular member (302).

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