A bolt anchoring device
By setting slots on the outer wall of the expansion sleeve and using insert rods to deform and shrink it, the problem of difficult replacement caused by corrosion of the expansion sleeve and embedded parts is solved, and convenient device replacement is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHINA PETROLEUM & CHEMICAL CORP
- Filing Date
- 2025-06-23
- Publication Date
- 2026-06-05
AI Technical Summary
The existing bolt anchoring device is difficult to replace because the expansion sleeve and the embedded parts corrode together during use, and the corrosion problem of the device cannot be effectively solved.
A slot is provided on the outer wall of the expansion sleeve. A rod is inserted into the slot and pressed inward to deform and shrink the expansion sleeve, thereby separating it from the embedded part, which facilitates the disassembly and replacement of the expansion sleeve.
The expansion sleeve is separated from the embedded part by the slot structure, which simplifies the replacement process, reduces the difficulty of replacement, and improves the maintenance efficiency of the device.
Smart Images
Figure CN224326542U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of equipment for extracting oil from wells, and in particular relates to a bolt anchoring device. Background Technology
[0002] When using a pumping unit to extract oil, the pumping unit base needs to be fixed to a concrete foundation. In existing technology, embedded parts are pre-embedded in the concrete foundation. The embedded parts include a cylinder and a bolt hanging plate connected to the inner wall of the cylinder. The bolt hanging plate has a straight through hole, and the pressure bar used to press down on the pumping unit base has a bolt through hole. The bolt (also known as the pressure bar bolt) has a rectangular bolt head.
[0003] When fixing the pumping unit base to the concrete foundation, first pass the bolt head through the "I" shaped through hole and the bolt hole, then rotate the bolt 90°, and finally tighten the nut. After the nut is tightened, the bolt head is stopped by the bolt holder, the nut pushes down on the pressure bar, and the pressure bar pushes down on the pumping unit base, thus firmly fixing the pumping unit base to the concrete foundation.
[0004] During normal oil production, the polished rod of the pumping unit moves up and down reciprocally. When the polished rod moves downward, the load on the polished rod is relatively small, and the force on the bolts and bolt holders is also relatively small. When the polished rod moves upward to allow oil to flow out of the wellhead, the load on the polished rod is larger, and the force on the bolts and bolt holders is also larger. In summary, the force on the bolts and bolt holders is alternating. During use, the bolts are prone to breakage, and they need to be replaced after breakage.
[0005] During prolonged use, the embedded parts in the cement foundation will corrode, the structural strength of the bolt mounting plate will decrease, and the connection strength between the bolt mounting plate and the cylinder will decrease. When the bolts transmit alternating forces to the bolt mounting plate, the bolt mounting plate will deform and will no longer be able to stop the bolt head, thus causing the pumping unit base to shake.
[0006] However, unlike screws, embedded parts cannot be replaced because they are buried in the cement foundation. Repairing embedded parts by welding or other methods is difficult and the repair results are poor.
[0007] To overcome the above-mentioned technical problems, the quick-installation base fixing device in the Chinese utility model patent with authorization announcement number CN218405590U can be replaced with a pressure bar bolt.
[0008] Specifically, Chinese utility model patent with authorization announcement number CN218405590U and authorization announcement date of January 31, 2023 discloses a quick-installation foundation fixing device. The device includes an expansion bolt component, which includes a core rod, an expansion body (equivalent to an expansion sleeve), and a compression nut (i.e., a nut). The core rod is a screw rod, and the lower end of the core rod is connected to a frustum (equivalent to an expansion head). The screw rod is connected to the compression nut. The expansion body has an opening slit, and the inner hole of the expansion body is a cylindrical hole. The inner diameter of the cylindrical hole is smaller than the outer diameter of the frustum, so that the frustum can press against the expansion body and cause the expansion body to open when it moves upward.
[0009] In the aforementioned utility model patent, the device is used to fix a cement foundation to a concrete floor. Specifically, an embedded part, including a cylinder, is pre-embedded in the concrete floor. When fixing the cement foundation, the device is first placed inside the cylinder, and then the compression nut is tightened. The compression nut drives the core rod to move upward, so that the expansion body opens and presses against the inner wall of the cylinder.
[0010] When the specifications of the above device are changed to convert the device into a pressure bar bolt, the screw passes through the bolt hole on the pressure bar, the expansion body and the truncated cone are located in the cylinder of the embedded part, and the device is fixedly connected to the embedded part by tightening the compression nut, and the compression nut is pressed down on the pressure bar, thereby fixing the pumping unit base to the cement foundation.
[0011] In practical use, similar to embedded parts, the above-mentioned device will corrode, causing the expansion body to rust together with the embedded parts, and the truncated cone to rust together with the expansion body. After the screw breaks, the entire device needs to be replaced, but because the expansion sleeve is corroded together with the embedded parts, it is difficult to remove the expansion sleeve, and therefore difficult to remove the truncated cone, making replacement quite troublesome. Utility Model Content
[0012] The purpose of this utility model is to provide a bolt anchoring device to solve the technical problem in the prior art where the expansion sleeve and the embedded part are corroded together, making it difficult to replace the device.
[0013] To achieve the above objectives, the technical solution of the bolt anchoring device provided by this utility model is as follows:
[0014] A bolt anchoring device includes an expansion bolt structure, which includes an expansion sleeve, an expansion head, a core rod with a threaded section, and a nut. The expansion sleeve has an opening for facilitating its expansion, and the outer wall of the expansion sleeve has a slot for inserting a rod between the expansion sleeve and an embedded part.
[0015] Furthermore, the expansion sleeve includes an expansion section and a guide section located below the expansion section. The opening slit is provided on the expansion section. The inner diameter of the expansion section is smaller than the maximum outer diameter of the expansion head, so as to fix the expansion section to the inner wall of the embedded part under the action of the expansion head. The inner diameter of the guide section is larger than the maximum outer diameter of the expansion head, so as to guide the expansion head into the expansion sleeve. The slot is provided on the outer wall surface of the expansion section and extends to the upper end of the expansion section.
[0016] Furthermore, the expansion sleeve includes an upper expansion section and a lower expansion section, the inner diameter of each expansion section being smaller than the maximum outer diameter of the expansion head, so as to fix each expansion section to the inner wall of the embedded part under the action of the expansion head; the outer wall surface of the upper expansion section is provided with an upper slot and a clearance hole, both of which extend to the upper end of the upper expansion section; the outer wall surface of the lower expansion section is provided with a lower slot, and the clearance hole corresponds vertically to the lower slot.
[0017] Furthermore, the opening seam includes an upper opening seam and a lower opening seam. The upper opening seam penetrates the upper expansion section, and the lower end of the upper opening seam is located within the lower expansion section. The lower opening seam penetrates the lower expansion section, and the upper end of the lower opening seam is located within the upper expansion section.
[0018] Furthermore, the opening slot includes an upper opening slot provided on the upper expansion section and a lower opening slot provided on the lower expansion section. The upper opening slot corresponds vertically to the lower slot and forms the aforementioned clearance hole.
[0019] Furthermore, the expansion head includes a bolt mounting plate with a straight through hole, and the core rod is a bolt with a straight bolt head that matches the shape of the straight through hole.
[0020] Furthermore, multiple slots are arranged at circumferential intervals.
[0021] Furthermore, the expansion head is shaped like a frustum, with its side surface being an outer conical surface and the inner wall surface of the expansion sleeve being an inner conical surface, and the inner and outer conical surfaces having the same taper.
[0022] Furthermore, the outer wall surface of the expansion sleeve is provided with barbs.
[0023] Furthermore, the lower end of the expansion sleeve is provided with a flared opening, and the inner diameter of the lower end of the flared opening is larger than the inner diameter of the upper end of the flared opening.
[0024] The beneficial effects of the bolt anchoring device provided by this utility model are as follows: This utility model is an improved invention. The core difference between this utility model and the prior art is that: in this utility model, a slot is provided on the outer wall surface of the expansion sleeve.
[0025] When using the bolt anchoring device of this utility model to fix the pumping unit base or cement foundation, the expansion sleeve expands inside the embedded part and is fixedly connected to the cylinder, similar to the prior art. However, unlike the prior art, when replacing the bolt anchoring device, a pry bar or other insert can be inserted between the expansion sleeve and the embedded part through the slot. Then, the insert can be used to push the expansion sleeve inward to deform and shrink it, thereby separating the expansion sleeve from the rusted part of the embedded part. After that, the expansion sleeve, expansion head, and other components can be removed, and a new bolt anchoring device can be replaced.
[0026] By first deforming and shrinking the expansion sleeve using a pry bar or other insert, the fastening force between the expansion sleeve and the embedded part can be reduced, thus making it easier to remove the expansion sleeve. Attached Figure Description
[0027] Figure 1 This is a schematic diagram of the structure of the bolt anchoring device of this utility model in use according to a specific embodiment 1;
[0028] Figure 2 This is a half-sectional view of the expansion sleeve of a specific embodiment 1 of the bolt anchoring device of this utility model;
[0029] Figure 3 This is a top view schematic diagram of the expansion sleeve in a specific embodiment 1 of the bolt anchoring device of this utility model;
[0030] Figure 4 This is a half-sectional view of the expansion head of a specific embodiment 1 of the bolt anchoring device of this utility model;
[0031] Figure 5 This is a top view schematic diagram of the expansion head of a specific embodiment 1 of the bolt anchoring device of this utility model;
[0032] Figure 6 This is a half-sectional view of the expansion sleeve in a specific embodiment 2 of the bolt anchoring device of this utility model;
[0033] Figure 7 This is a half-sectional view of the expansion sleeve of a specific embodiment 3 of the bolt anchoring device of this utility model.
[0034] Explanation of reference numerals in the attached figures:
[0035] 1. Expansion sleeve; 11. Barb; 12. Upper opening slot; 13. Upper slot; 14. Clearance hole; 15. Lower slot; 16. Lower opening slot; 17. Inner conical surface; 18. Flared mouth; 2. Expansion head; 21. "I" shaped through hole; 22. Outer conical surface; 3. Cement foundation; 4. Embedded part; 5. Bolt; 51. "I" shaped bolt head; 6. Pumping unit base; 7. Pressure bar; 8. Nut. Detailed Implementation
[0036] To address the problems in the background technology, the core inventive concept of this utility model is as follows: a slot is provided on the outer wall of the expansion sleeve. When disassembling the expansion sleeve, a pry bar or other insert is inserted into the slot, and the pry bar is used to make the expansion sleeve contract inward, thereby reducing the fastening force between the expansion sleeve and the embedded part, making it easier to remove the expansion sleeve.
[0037] The present invention will be further described in detail below with reference to the embodiments.
[0038] Specific embodiment 1 of the bolt anchoring device provided by this utility model:
[0039] like Figures 1-5 As shown, in a basic specific implementation, the bolt anchoring device includes an expansion bolt structure, which includes an expansion sleeve 1, an expansion head 2, a core rod with a threaded section, and a nut 8. The expansion sleeve 1 is provided with an opening slit to facilitate the expansion of the expansion sleeve 1, and the outer wall surface of the expansion sleeve 1 is provided with a slot for inserting a rod between the expansion sleeve 1 and the embedded part 4.
[0040] The expansion sleeve 1 includes an expansion section and a guide section located below the expansion section. The opening slit is provided on the expansion section. The inner diameter of the expansion section is smaller than the maximum outer diameter of the expansion head 2, so as to fix the expansion section to the inner wall of the embedded part 4 under the action of the expansion head 2. The inner diameter of the guide section is larger than the maximum outer diameter of the expansion head 2, so as to guide the expansion head 2 into the expansion sleeve 1. The slot is provided on the outer wall surface of the expansion section and extends to the upper end of the expansion section.
[0041] The number of slots can be one, or two, three, four, or more spaced apart. A greater number of slots makes the expansion sleeve 1 easier to disassemble, while a smaller number of slots results in higher structural strength of the expansion sleeve 1 and a more reliable connection between the expansion sleeve 1 and the embedded part 4. Those skilled in the art can determine the number of slots based on actual conditions (mainly the dimensions of the embedded part 4 and the expansion sleeve 1), which will not be elaborated upon here.
[0042] Preferably, the length of the opening is greater than 2 / 3 of the height of the expansion sleeve 1, so as to increase the expansion area of the expansion sleeve 1, that is, to increase the contact area between the expansion sleeve 1 and the embedded part 4, thereby improving the fixing effect. However, in other specific embodiments, the length of the opening can also be 1 / 2 of the height of the expansion sleeve 1, etc. Those skilled in the art can set the length of the opening according to actual needs, as long as there is sufficient contact area between the expansion sleeve 1 and the embedded part 4 to ensure stable fixing of the pumping unit base 6 or the cement foundation 3.
[0043] In one specific embodiment, the core rod and the expansion head 2 are integrally formed. In this case, if the core rod breaks, the entire bolt anchoring device needs to be replaced.
[0044] Preferably, in Figures 1-5 In the specific embodiment shown, the expansion head 2 and the core rod are separately arranged. The expansion head 2 includes an integrally connected bolt mounting plate and a hollow expansion frustum. The bolt mounting plate has an "I"-shaped through hole 21. The core rod is a bolt 5, and the bolt 5 has an "I"-shaped bolt head 51 that matches the shape of the "I"-shaped through hole 21. In case of core rod breakage, only the core rod needs to be replaced, making replacement more convenient.
[0045] During prolonged use, the expansion head 2 becomes corroded, the structural strength of the bolt mounting plate decreases, and the connection strength between the bolt mounting plate and the hollow expansion frustum decreases. When the bolt 5 transmits alternating force to the bolt mounting plate, the bolt mounting plate deforms and can no longer stop the bolt head. Consequently, the pressure bar 7 cannot press the pumping unit base 6 tightly, causing the pumping unit base 6 to shake. Therefore, it is necessary to replace the expansion sleeve 1 and the expansion head 2.
[0046] When replacing components such as expansion sleeve 1, the beneficial effects of the bolt anchoring device in this utility model are as follows.
[0047] When using the bolt anchoring device of this utility model to fix the pumping unit base 6 or the cement foundation 3, the expansion sleeve 1 expands inside the cylinder of the embedded part 4 and is fixedly connected to the cylinder, similar to the prior art. However, unlike the prior art, when replacing the bolt anchoring device, a pry bar or other insert can be inserted between the expansion sleeve 1 and the embedded part 4 through the slot. Then, the insert can be used to push the expansion sleeve 1 inward to deform and shrink it, thereby separating the expansion sleeve 1 from the rusted part of the embedded part 4. After that, the expansion sleeve 1, expansion head 2, and other components can be removed, and a new bolt anchoring device can be replaced.
[0048] By first deforming and shrinking the expansion sleeve 1 using a pry bar or other insert, the fastening force between the expansion sleeve 1 and the embedded part 4 can be reduced, thus making it easier to remove the expansion sleeve 1.
[0049] It should be noted that when the core rod and the expansion head 2 are integrally formed, if the upper end of the core rod is above the embedded part 4 after the core rod breaks, the expansion head 2 can be separated from the expansion sleeve 1 by striking the core rod; however, if the upper end of the core rod is in the embedded part 4, it is necessary to find the force transmission rod and place the lower end of the force transmission rod on the expansion head 2, and strike the upper end of the force transmission rod with a hammer, or directly use the insertion rod to shrink the expansion sleeve 1 and use the expansion sleeve 1 to press the expansion head 2 downward to separate the expansion head 2 from the expansion sleeve 1.
[0050] Similarly, when the core rod and expansion head 2 are set separately, the expansion head 2 can be separated from the expansion sleeve 1 by using a force transmission rod and a hammer, or the expansion head 2 can be separated from the expansion sleeve 1 directly by using an insert rod.
[0051] When installing the bolt anchoring device, to facilitate the entry of the expansion head 2 into the expansion sleeve 1, preferably, as follows: Figures 1-5 As shown, the lower end of the expansion sleeve 1 is provided with a flared opening 18, and the inner diameter of the lower end of the flared opening 18 is larger than the inner diameter of the upper end of the flared opening 18. Specifically, the flared opening 18 is provided on the guide section.
[0052] Furthermore, the inner wall surface of the guide section is a guide cone surface, and the taper of the guide cone surface is smaller than the taper of the flared mouth 18, so that the expansion head 2 can better enter the expansion section.
[0053] Preferably, to increase the contact area between the expansion head 2 and the expansion sleeve 1 and improve the reliability of the bolt anchoring device, in Figures 1-5 In the specific embodiment shown, the expansion head 2 is shaped like a frustum, the side surface of the expansion head 2 is an outer conical surface 22, and the inner wall surface of the expansion sleeve 1 is an inner conical surface 17, with the inner conical surface 17 having the same taper as the outer conical surface 22. Specifically, the inner wall surface of the expansion section is a pressing conical surface for pressing and engaging with the outer conical surface 22, and the extrusion conical surface and the guide conical surface together constitute the inner conical surface 17.
[0054] At this time, the expansion section and the expansion head 2 are in surface contact, and the friction between the expansion section and the expansion head 2 is relatively large, which can better fix the pumping unit base 6 or the cement foundation 3.
[0055] In other specific embodiments, referring to the Chinese utility model patent with authorization announcement number CN218405590U, the inner wall surface of the expansion sleeve 1 is a cylindrical surface, and the expansion sleeve 1 does not have a flared opening 18. In this case, the expansion head 2 and the expansion sleeve 1 are in line contact.
[0056] In the above specific embodiment, the outer wall surface of the expansion sleeve 1 is smooth. When the polished rod of the pumping unit moves upward, due to the large load on the polished rod, the pumping unit base 6 tends to move upward. The movement tendency of the pumping unit base 6 is transmitted to the expansion sleeve 1 through the pressure bar 7, nut 8, core rod and expansion head 2, so the expansion sleeve 1 also tends to move upward. The friction between the expansion sleeve 1 and the embedded part 4 is used to counteract the upward movement tendency of the expansion sleeve 1. Therefore, the friction between the expansion sleeve 1 and the embedded part 4 is large, and the normal pressure between the expansion sleeve 1 and the embedded part 4 is also large. Therefore, a large force is needed to tighten the nut 8 so that the expansion head 2 locks the expansion sleeve 1, resulting in a large deformation of the expansion sleeve 1, which makes it difficult to disassemble.
[0057] To facilitate better disassembly of the expansion sleeve 1, preferably, in Figures 1-5 In the specific embodiment shown, the outer wall surface of the expansion sleeve 1 is provided with barbs 11. The barbs 11 cooperate with the inner wall of the embedded part 4, which is corroded and becomes uneven. This allows the embedded part 4 to apply downward pressure to the barbs 11, thereby reducing the maximum friction between the expansion sleeve 1 and the embedded part 4, reducing the normal pressure between the expansion sleeve 1 and the embedded part 4, reducing the deformation of the expansion sleeve 1, and finally facilitating the disassembly of the expansion sleeve 1.
[0058] Meanwhile, by setting barbs 11, when the expansion head 2 tends to move upward, there is a sufficiently large force between the expansion sleeve 1 and the embedded part 4, so as to better fix the expansion sleeve 1, prevent the expansion sleeve 1 from moving upward, and ensure that the pumping unit base 6 does not shake.
[0059] Specific embodiment 2 of the bolt anchoring device provided by this utility model:
[0060] The purpose of this utility model is to provide a bolt anchoring device for expansion sleeves.
[0061] In reference Figures 1-5 On the basis of, such as Figure 6 As shown, the core difference between this embodiment and specific embodiment 1 is that in specific embodiment 1, the expansion sleeve 1 includes an expansion section and a guide section, while in this embodiment, the expansion sleeve 1 includes an upper expansion section and a lower expansion section.
[0062] like Figure 6 As shown, the expansion sleeve 1 includes an upper expansion section and a lower expansion section. The inner diameter of each expansion section is smaller than the maximum outer diameter of the expansion head 2, so as to fix each expansion section to the inner wall of the embedded part 4 under the action of the expansion head 2. The outer wall surface of the upper expansion section is provided with an upper slot 13 and a clearance hole 14, both of which extend to the upper end of the upper expansion section. The outer wall surface of the lower expansion section is provided with a lower slot 15, and the clearance hole 14 corresponds to the lower slot 15 vertically. The opening slot includes an upper opening slot 12 and a lower opening slot 16. The upper opening slot 12 penetrates the upper expansion section, and the lower end of the upper opening slot 12 is located inside the lower expansion section. The lower opening slot 16 penetrates the lower expansion section, and the upper end of the lower opening slot 16 is located inside the upper expansion section.
[0063] At this point, the expansion sleeve 1 has a large expansion area, resulting in a high connection strength between the expansion sleeve 1 and the embedded part 4. Compared to the technical solution where a single slot directly penetrates the expansion sleeve 1 in the vertical direction, in this embodiment, the expansion sleeve 1 is divided into an upper expansion section and a lower expansion section. When disassembling the expansion sleeve 1, the upper expansion section can be deformed and contracted through the upper slot 13, and the lower expansion section can be deformed and contracted through the clearance hole 14 and the lower slot 15, thus allowing for segmented disassembly of the expansion sleeve 1 and facilitating its removal. Simultaneously, the longer opening length facilitates the deformation of each expansion section.
[0064] Specific embodiment 3 of the bolt anchoring device provided by this utility model:
[0065] The purpose of this invention is to provide another bolt anchoring device for expansion sleeves.
[0066] In reference Figures 1-6 On the basis of, such as Figure 7As shown, the core difference between this embodiment and specific embodiment 2 is that in specific embodiment 2, the expansion sleeve 1 includes both a clearance hole 14 and an upper opening slit 12, while in this embodiment, the upper opening slit 12 constitutes a clearance hole.
[0067] like Figure 7 As shown, the opening slot includes an upper opening slot 12 provided on the upper expansion section and a lower opening slot 16 provided on the lower expansion section. The upper opening slot 12 corresponds vertically to the lower slot 15 and forms the clearance hole. The structure is simple and the expansion sleeve 1 has high structural strength.
[0068] Specific embodiment 4 of the bolt anchoring device provided by this utility model:
[0069] The purpose of this utility model is to provide another bolt anchoring device for expansion sleeves.
[0070] Reference Figures 1-7 As shown in the Chinese utility model patent with authorization announcement number CN218405590U, the core difference between this embodiment and specific embodiment 1 is that: in specific embodiment 1, the expansion sleeve 1 includes an expansion section and a guide section, and the expansion section is located above the guide section, that is, the expansion section is located at the upper part of the expansion sleeve 1; while in this embodiment, the expansion sleeve 1 includes an expansion section and a small diameter section located above the expansion section, that is, the expansion section is located at the lower part of the expansion sleeve 1.
[0071] Referring to the Chinese utility model patent with authorization announcement number CN218405590U, the lower half of the expansion sleeve 1 constitutes the expansion section, and the upper half of the expansion sleeve 1 constitutes the small diameter section, the outer diameter of the small diameter section being smaller than the outer diameter of the expansion section.
[0072] When disassembling the expansion sleeve 1, since the outer diameter of the small diameter section is small and does not expand, a gap is formed between the small diameter section and the embedded part 4 for the insertion rod to pass through. The insertion rod can be easily inserted into the slot of the expansion section through this gap, and then the expansion sleeve 1 can be disassembled using the insertion rod.
[0073] Finally, it should be noted that the above description is only a preferred embodiment of this utility model and is not intended to limit this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features, or organically combine different specific implementation methods to create the specific implementation methods shown in the accompanying drawings. Of course, those skilled in the art can also create other specific implementation methods not shown in the accompanying drawings. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A bolt anchoring device, comprising an expansion bolt structure, the expansion bolt structure including an expansion sleeve, an expansion head, a core rod having a threaded section, and a nut, wherein the expansion sleeve has an opening for facilitating the expansion of the expansion sleeve, characterized in that, The outer wall of the expansion sleeve is provided with a slot for inserting the insertion rod between the expansion sleeve and the embedded part.
2. The bolt anchoring device as described in claim 1, characterized in that, The expansion sleeve includes an expansion section and a guide section located below the expansion section. The opening slit is provided on the expansion section. The inner diameter of the expansion section is smaller than the maximum outer diameter of the expansion head, so as to fix the expansion section to the inner wall of the embedded part under the action of the expansion head. The inner diameter of the guide section is larger than the maximum outer diameter of the expansion head, so as to guide the expansion head into the expansion sleeve. The slot is provided on the outer wall surface of the expansion section and extends to the upper end of the expansion section.
3. The bolt anchoring device as described in claim 1, characterized in that, The expansion sleeve includes an upper expansion section and a lower expansion section. The inner diameter of each expansion section is smaller than the maximum outer diameter of the expansion head, so as to fix each expansion section to the inner wall of the embedded part under the action of the expansion head. The outer wall surface of the upper expansion section is provided with an upper slot and a clearance hole, both of which extend to the upper end of the upper expansion section. The outer wall surface of the lower expansion section is provided with a lower slot, and the clearance hole corresponds to the lower slot vertically.
4. The bolt anchoring device as described in claim 3, characterized in that, The opening seam includes an upper opening seam and a lower opening seam. The upper opening seam penetrates the upper expansion section, and the lower end of the upper opening seam is located inside the lower expansion section. The lower opening seam penetrates the lower expansion section, and the upper end of the lower opening seam is located inside the upper expansion section.
5. The bolt anchoring device as described in claim 3, characterized in that, The opening slot includes an upper opening slot provided on the upper expansion section and a lower opening slot provided on the lower expansion section. The upper opening slot corresponds vertically to the lower slot and forms the aforementioned clearance hole.
6. The bolt anchoring device as described in any one of claims 1 to 5, characterized in that, The expansion head includes a bolt mounting plate with an "I"-shaped through hole. The core rod is a bolt with an "I"-shaped bolt head that matches the shape of the "I"-shaped through hole.
7. The bolt anchoring device as described in any one of claims 1 to 5, characterized in that, The corresponding slots are arranged at intervals along the circumference.
8. The bolt anchoring device as described in any one of claims 1 to 5, characterized in that, The expansion head is shaped like a frustum of a cone, with the side surface of the expansion head being an outer conical surface and the inner wall surface of the expansion sleeve being an inner conical surface, and the inner and outer conical surfaces having the same taper.
9. The bolt anchoring device as described in any one of claims 1 to 5, characterized in that, The outer wall of the expansion sleeve is provided with barbs.
10. The bolt anchoring device according to any one of claims 1 to 5, characterized in that, The lower end of the expansion sleeve is provided with a flared opening, and the inner diameter of the lower end of the flared opening is larger than the inner diameter of the upper end of the flared opening.