An adjustable anchor bolt fastener

Abstract

This utility model provides an adjustable anchor bolt fastener, belonging to the technical field of anchor bolt fasteners. The adjustable anchor bolt fastener includes: a base plate, an adjusting bolt, a limiting ring, a locking nut, and a protective cover. The base plate has a rectangular plate structure, with a circular through hole at its geometric center. The diameter of the through hole is larger than the outer diameter of the adjusting bolt. The base plate is made of carbon steel. The adjusting bolt passes through the through hole in the base plate. The upper end of the adjusting bolt has a threaded section, the length of which is one-third of the total length of the adjusting bolt. The lower end of the adjusting bolt has a tapered tip with a cone angle of 60 degrees. The limiting ring is fitted around the middle of the adjusting bolt, and the inner diameter of the limiting ring matches the outer diameter of the adjusting bolt. This design solves the technical problems of existing anchor bolt fasteners, such as low height adjustment accuracy, poor structural stability, and susceptibility to environmental factors during use.

Description

Technical Field

[0001] This utility model belongs to the technical field of anchor bolt fasteners, specifically, it relates to an adjustable anchor bolt fastener. Background Technology

[0002] Anchor bolts are crucial connecting and fixing components in construction engineering, machinery installation, and industrial production, widely used for securing the bases of various equipment. Current anchor bolt technology primarily employs the traditional method of directly inserting bolts into the ground and locking them in place with nuts. This traditional structure has several technical drawbacks in practical applications. First, the height adjustment precision of traditional anchor bolts is low. Due to the lack of a precise adjustment mechanism, height adjustment is often achieved only by adding or removing shims or adjusting the nut position, with adjustment accuracy typically only reaching the millimeter level, which is insufficient for the requirements of precision equipment installation. Second, the structural stability of traditional anchor bolts is poor. The limited contact area between the bolt and the ground makes them prone to loosening or displacement under lateral forces or vibration loads, affecting the normal operation of the equipment. Third, traditional anchor bolts are susceptible to environmental factors. The threaded parts are exposed to the external environment, making them vulnerable to corrosion, dust, and moisture, leading to thread wear, rust, or jamming, severely impacting service life and reliability. To address these issues, existing technologies have employed various improvements, including using high-strength materials to manufacture bolts, adding anti-corrosion coatings, and designing dedicated adjustment mechanisms. However, these solutions are often complex in structure, costly, and still have shortcomings in terms of adjustment accuracy, structural stability, and environmental adaptability. Therefore, there is an urgent need to develop a new type of anchor bolt fastener that is simple in structure, has high adjustment accuracy, good stability, and strong environmental adaptability. Utility Model Content

[0003] In view of this, the present invention provides an adjustable anchor bolt fastener, which can solve the technical problems of low height adjustment accuracy, poor structural stability, and susceptibility to failure due to environmental factors in the use of existing anchor bolt fasteners.

[0004] This utility model is implemented as follows:

[0005] This utility model provides an adjustable anchor bolt fastener, comprising: a base plate, an adjusting bolt, a limiting ring, a locking nut, and a protective cover; the base plate has a rectangular plate structure, with a circular through hole at its geometric center, the diameter of which is larger than the outer diameter of the adjusting bolt; the base plate is made of carbon steel; the adjusting bolt passes through the through hole in the base plate, with a threaded section at its upper end, the length of which is one-third of the total length of the adjusting bolt; and a tapered tip at its lower end, the tapered tip having a cone angle of 60 degrees; the limiting ring is fitted onto the adjusting bolt. In the middle, the inner diameter of the limiting ring matches the outer diameter of the adjusting bolt. The outer diameter of the limiting ring is larger than the diameter of the through hole in the base plate. The upper surface of the limiting ring is in contact with the lower surface of the base plate. The locking nut is threaded onto the threaded section of the adjusting bolt. The locking nut is located above the base plate, and an adjustment gap is formed between the bottom surface of the locking nut and the upper surface of the base plate. The protective cover is fastened above the base plate. The protective cover has an inverted frustum-shaped structure. The diameter of the large end of the protective cover matches the outer contour of the base plate. The small end of the protective cover has a circular opening, and the upper end of the adjusting bolt passes through the circular opening of the protective cover.

[0006] The technical advantages of the adjustable anchor bolt fastener provided by this utility model are as follows: Through the combined design of a base plate, adjusting bolt, limiting ring, locking nut, and protective cover, the height of the anchor bolt fastener is adjustable. The rectangular plate structure of the base plate provides a stable support foundation. The threaded section of the adjusting bolt cooperates with the locking nut to form an adjustable height adjustment mechanism. The limiting ring prevents the adjusting bolt from sinking excessively. The tapered tip design facilitates insertion into the ground for fixing. The protective cover extends the service life of the entire fastener. The overall structure is simple, reliable, and has high adjustment accuracy.

[0007] Based on the above technical solution, the adjustable anchor bolt fastener of this utility model can be further improved as follows:

[0008] The base plate has mounting holes at its four corners. The mounting holes are circular and have a diameter of 8mm to 12mm. The central axis of the mounting holes is parallel to the thickness direction of the base plate. The mounting holes are used to insert fixing bolts to connect and fix the base plate to the equipment.

[0009] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the installation holes are set at the four corners of the base plate, providing a standardized fixing method for the connection between the fastener and the equipment base. The circular design of the installation holes ensures the smooth insertion of the fixing bolts. The diameter range of 8mm to 12mm accommodates fixing bolts of different specifications. The design that the central axis of the installation hole is parallel to the thickness direction of the base plate ensures the verticality and stability of the fixed connection. The symmetrical distribution at the four corners makes the load distribution of the fastener more uniform.

[0010] Furthermore, the adjusting bolt is made of stainless steel, with an outer diameter of 16mm to 24mm and a total length of 150mm to 300mm. The threaded section of the adjusting bolt adopts a standard metric thread of M16 to M24. The middle part of the adjusting bolt is provided with an operating section with a hexagonal cross-section, the length of which is 20mm to 40mm. The operating section is used for wrench clamping to realize the rotation adjustment of the adjusting bolt.

[0011] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the use of stainless steel for the adjusting bolt improves its corrosion resistance; the outer diameter range of 16mm to 24mm meets different load-bearing requirements; the total length of 150mm to 300mm adapts to various adjustment height requirements; the use of standard metric threads ensures good fit with the lock nut; the hexagonal cross-section of the operating section facilitates rotational adjustment using a wrench; the length range of the operating section provides sufficient wrench clamping space; and the overall design balances strength and ease of operation.

[0012] Furthermore, the limiting ring is made of brass, with an axial height of 10mm to 20mm. The outer diameter of the limiting ring is 5mm to 15mm larger than the diameter of the through hole in the base plate. The inner surface of the limiting ring is provided with a spiral groove that matches the outer surface of the adjusting bolt. The pitch of the spiral groove is the same as the pitch of the threaded section of the adjusting bolt. The limiting ring and the adjusting bolt are connected by a threaded engagement through the spiral groove.

[0013] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the limiting ring is made of brass material, which has good wear resistance and self-lubricating properties; the axial height of 10mm to 20mm provides sufficient bearing area; the design that the outer diameter is 5mm to 15mm larger than the diameter of the through hole of the base plate ensures effective limiting effect; the inner surface spiral groove and the threaded engagement of the adjusting bolt realize precise height adjustment; the design that the spiral groove pitch is the same as the thread pitch of the adjusting bolt thread section ensures the synchronicity of rotation adjustment; and the threaded engagement connection method improves the stability of the overall structure.

[0014] Furthermore, the locking nut is made of alloy steel, has a hexagonal outer contour, a distance between opposite sides of the locking nut of 24mm to 36mm, an axial height of the locking nut of 12mm to 25mm, an internal thread of the locking nut that forms a tight fit with the threaded section of the adjusting bolt, and an annular groove on the bottom surface of the locking nut with a depth of 2mm to 5mm.

[0015] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the locking nut is made of alloy steel, which provides sufficient strength and hardness; the hexagonal outer contour design facilitates operation with a wrench; the distance between opposite flats of 24mm to 36mm accommodates wrenches of different sizes; the axial height of 12mm to 25mm ensures full thread contact with the adjusting bolt; the tight fit between the internal thread and the thread section of the adjusting bolt ensures the locking effect; and the setting of the annular groove on the bottom surface reduces the contact area with the base plate, reduces frictional resistance, and improves locking accuracy.

[0016] Furthermore, the protective cover is made of polyvinyl chloride plastic, with a wall thickness of 2mm to 5mm. The diameter of the large end of the protective cover is 10mm to 20mm larger than the outer contour of the base plate, and the opening diameter of the small end of the protective cover is 3mm to 8mm larger than the outer diameter of the adjusting bolt. The inner surface of the protective cover is provided with multiple longitudinal reinforcing ribs, the height of which is 1mm to 3mm, and the reinforcing ribs are evenly distributed along the circumference of the protective cover.

[0017] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the protective cover is made of polyvinyl chloride plastic material, which has good weather resistance and chemical stability; the wall thickness of 2mm to 5mm reduces weight while ensuring strength; the design of the large end diameter being 10mm to 20mm larger than the outer contour of the base plate ensures complete coverage and protection; the reasonable design of the small end opening diameter allows the adjusting bolts to pass through while restricting the entry of dust and moisture; the setting of multiple longitudinal reinforcing ribs improves the structural strength of the protective cover; and the equidistant distribution of the reinforcing ribs ensures the uniformity of the overall structure.

[0018] Furthermore, the upper surface of the base plate is provided with a plurality of concentric circular grooves, the depth of which is 1mm to 3mm and the spacing between which is 5mm to 10mm. The concentric circular grooves are distributed outward from the geometric center of the base plate.

[0019] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the concentric circular groove design on the upper surface of the base plate increases the contact area with the equipment base; the groove depth of 1mm to 3mm provides an effective anti-slip function without affecting the overall strength; the spacing design of 5mm to 10mm ensures the density and effect of the groove; the outward diffusion distribution with the geometric center of the base plate as the center forms a good radial gripping force; the setting of the concentric circular grooves significantly improves the friction coefficient between the fastener and the equipment base, effectively preventing relative sliding.

[0020] Furthermore, the lower surface of the base plate is provided with grid-like protrusions, the height of which is 2mm to 4mm and the spacing between which is 8mm to 15mm, forming a regular square pattern on the lower surface of the base plate.

[0021] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the grid-like protrusion design on the lower surface of the base plate enhances the friction and grip with the ground; the protrusion height of 2mm to 4mm ensures the contact effect while avoiding excessive stress concentration; the spacing design of 8mm to 15mm ensures the density and uniformity of the protrusions; the regular square pattern forms a multi-directional grip; the grid-like protrusion effectively prevents the base plate from slipping on the ground, and improves the stability and reliability of the entire fastener.

[0022] Furthermore, the tapered tip surface of the adjusting bolt is provided with a spiral groove, the depth of which is 0.5mm to 2mm and the pitch of which is 5mm to 10mm. The spiral groove extends from the apex of the tapered tip toward the middle of the adjusting bolt.

[0023] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the spiral groove design on the conical tip surface of the adjusting bolt enhances the gripping force with the ground; the groove depth of 0.5mm to 2mm provides an effective gripping function without affecting the strength; the pitch design of 5mm to 10mm ensures the continuity and effectiveness of the spiral groove; the extension direction starting from the apex of the conical tip forms a good guiding effect; the setting of the spiral groove makes the adjusting bolt have better self-locking performance when inserted into the ground, effectively preventing loosening caused by vibration or external force.

[0024] Furthermore, the outer surface of the limiting ring is provided with multiple radial protrusions, the height of which is 1mm to 3mm and the width of which is 3mm to 8mm. The multiple radial protrusions are distributed at equal angles along the circumference of the limiting ring, and the number of radial protrusions is 6 to 12.

[0025] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the radial protrusion design on the outer surface of the limiting ring enhances the stability of the fit with the through hole of the base plate; the protrusion height of 1mm to 3mm provides an effective positioning function; the width of 3mm to 8mm ensures the strength and contact area of ​​the protrusion; the equiangular distribution design ensures the uniform distribution of radial force; the number of 6 to 12 protrusions ensures the effect while avoiding excessive complexity; the setting of radial protrusions effectively prevents the limiting ring from rotating in the through hole of the base plate, and improves the positioning accuracy and stability of the entire adjustment mechanism.

[0026] Compared with existing technologies, the beneficial effects of this adjustable anchor bolt fastener are as follows: This invention effectively solves the technical problem of low height adjustment accuracy in existing anchor bolt fasteners through an innovative combination design of a base plate, adjusting bolt, limiting ring, locking nut, and protective cover. The rectangular plate structure of the base plate, combined with the four corner mounting holes, provides a stable support foundation and standardized connection method for the entire fastener, significantly improving structural stability. The threaded section of the adjusting bolt and the locking nut form a precise height adjustment mechanism, and the spiral groove design of the limiting ring enables synchronous adjustment with the adjusting bolt, greatly improving adjustment accuracy. The protective cover effectively isolates the internal mechanism from the influence of the external environment, extending its service life. The concentric circular grooves and grid-like protrusions on the surface of the base plate, along with the spiral grooves on the conical tip of the adjusting bolt, enhance the clamping force between the fastener and the equipment base and the ground, preventing slippage and loosening. The radial protrusion design of the limiting ring further improves positioning accuracy. The overall structure is simple and reliable, with a large adjustment range, high precision, good stability, and strong applicability. Compared with existing technologies, it has significant improvements in adjustment precision, structural stability, and environmental adaptability. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a structural schematic diagram of an adjustable anchor bolt fastener;

[0029] The attached diagram lists the components represented by each number as follows:

[0030] 10. Base plate; 20. Adjusting bolt; 30. Limiting ring; 40. Locking nut; 50. Protective cover. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0032] like Figure 1The image shows a first embodiment of an adjustable anchor bolt fastener provided by this utility model. In this embodiment, it includes: a base plate 10, an adjusting bolt 20, a limiting ring 30, a locking nut 40, and a protective cover 50. The base plate has a rectangular plate structure, and a circular through hole is provided at the geometric center of the base plate. The diameter of the through hole is larger than the outer diameter of the adjusting bolt. The base plate is made of carbon steel. The adjusting bolt passes through the through hole of the base plate. The upper end of the adjusting bolt has a threaded section, the length of which is one-third of the total length of the adjusting bolt. The lower end of the adjusting bolt has a tapered tip with a cone angle of 60 degrees. A limiting ring is fitted around the middle of the adjusting bolt. The inner diameter of the limiting ring matches the outer diameter of the adjusting bolt. The outer diameter of the limiting ring is larger than the diameter of the through hole in the base plate. The upper surface of the limiting ring is in contact with the lower surface of the base plate. A locking nut is threaded onto the threaded section of the adjusting bolt. The locking nut is located above the base plate, and an adjustment gap is formed between the bottom surface of the locking nut and the upper surface of the base plate. A protective cover is fastened above the base plate. The protective cover has an inverted frustum-shaped structure. The diameter of the large end of the protective cover matches the outer contour of the base plate. The small end of the protective cover has a circular opening, through which the upper end of the adjusting bolt passes.

[0033] In the above technical solution, mounting holes are provided at the four corners of the base plate. The mounting holes are circular and have a diameter of 8mm to 12mm. The central axis of the mounting holes is parallel to the thickness direction of the base plate. The mounting holes are used to pass through fixing bolts to achieve connection and fixation with the equipment base.

[0034] Furthermore, in the above technical solution, the adjusting bolt is made of stainless steel, the outer diameter of the adjusting bolt is 16mm to 24mm, the total length of the adjusting bolt is 150mm to 300mm, the thread section of the adjusting bolt adopts standard metric thread of M16 to M24, and the middle part of the adjusting bolt is provided with an operating section with a hexagonal cross section, the length of the operating section is 20mm to 40mm, and the operating section is used for wrench clamping to realize the rotation adjustment of the adjusting bolt.

[0035] Furthermore, in the above technical solution, the limiting ring is made of brass, the axial height of the limiting ring is 10mm to 20mm, the outer diameter of the limiting ring is 5mm to 15mm larger than the diameter of the through hole in the base plate, the inner surface of the limiting ring is provided with a spiral groove that matches the outer surface of the adjusting bolt, the pitch of the spiral groove is the same as the pitch of the threaded section of the adjusting bolt, and the limiting ring and the adjusting bolt form a threaded connection through the spiral groove.

[0036] Furthermore, in the above technical solution, the locking nut is made of alloy steel, has a hexagonal outer contour, a distance between opposite sides of the locking nut of 24mm to 36mm, an axial height of the locking nut of 12mm to 25mm, a tight fit between the internal thread of the locking nut and the threaded section of the adjusting bolt, and an annular groove on the bottom surface of the locking nut with a depth of 2mm to 5mm.

[0037] Furthermore, in the above technical solution, the material of the protective cover is polyvinyl chloride plastic, the wall thickness of the protective cover is 2mm to 5mm, the diameter of the large end of the protective cover is 10mm to 20mm larger than the outer contour of the base plate, the opening diameter of the small end of the protective cover is 3mm to 8mm larger than the outer diameter of the adjusting bolt, and the inner surface of the protective cover is provided with multiple longitudinal reinforcing ribs, the height of the reinforcing ribs is 1mm to 3mm, and the reinforcing ribs are evenly distributed along the circumference of the protective cover.

[0038] Furthermore, in the above technical solution, the upper surface of the base plate is provided with multiple concentric circular grooves, the depth of the concentric circular grooves is 1mm to 3mm, the spacing between the concentric circular grooves is 5mm to 10mm, and the concentric circular grooves are distributed outward from the geometric center of the base plate.

[0039] Furthermore, in the above technical solution, the lower surface of the base plate is provided with grid-like protrusions, the height of the grid-like protrusions is 2mm to 4mm, the spacing of the grid-like protrusions is 8mm to 15mm, and the grid-like protrusions form a regular square pattern on the lower surface of the base plate.

[0040] Furthermore, in the above technical solution, the tapered tip surface of the adjusting bolt is provided with a spiral groove, the depth of the spiral groove is 0.5mm to 2mm, the pitch of the spiral groove is 5mm to 10mm, and the spiral groove extends from the apex of the tapered tip towards the middle of the adjusting bolt.

[0041] Furthermore, in the above technical solution, the outer surface of the limiting ring is provided with multiple radial protrusions, the height of the radial protrusions is 1mm to 3mm, the width of the radial protrusions is 3mm to 8mm, the multiple radial protrusions are distributed at equal angles along the circumference of the limiting ring, and the number of radial protrusions is 6 to 12.

[0042] In this embodiment, the base plate is made of Q235 carbon steel plate with a thickness of 10mm and an external square shape of 150mm×150mm. The diameter of the central through hole is 25mm, and the diameter of the four corner mounting holes is 10mm. The center of each hole is 30mm from the edge of the base plate. Five concentric circular grooves are provided on the upper surface of the base plate. The groove depth is 2mm, and the diameters from the inside to the outside are 40mm, 55mm, 70mm, 85mm, and 100mm, respectively. The groove width is 3mm. The lower surface of the base plate has regular grid-like protrusions with a height of 3mm, a grid size of 10mm×10mm, and a protrusion width of 2mm. The adjusting bolt is made of 304 stainless steel, with a total length of 200mm, an outer diameter of 20mm, and a thread length of 60mm. It uses M20×2.5 standard metric threads. A hexagonal operating section is provided in the middle of the adjusting bolt, with a side-to-side distance of 30mm and a length of 30mm. The tapered tip has a 60-degree cone angle and a 15mm tip length. It features a spiral groove on its surface with a depth of 1mm and a pitch of 8mm. The limiting ring is made of H62 brass, with an outer diameter of 35mm, an inner diameter of 20mm, an axial height of 15mm, a spiral groove depth of 1mm on its inner surface, and a pitch of 2.5mm. The outer surface of the limiting ring has eight radial protrusions, each 2mm high and 5mm wide, evenly distributed. The locking nut is made of 40Cr alloy steel, hexagonal in shape, with a distance of 30mm between opposite sides, an axial height of 18mm, an internal thread of M20×2.5, and a 3mm deep annular groove on its bottom surface. The protective cover is made of PVC plastic, with a wall thickness of 3mm, a large end diameter of 170mm, a small end opening diameter of 28mm, and a height of 40mm. Its inner surface has 12 longitudinal reinforcing ribs, each 2mm high and 3mm wide. In use, the base plate is fixed to the equipment base, the adjusting bolt passes through the through hole in the base plate, the limiting ring is fitted onto the adjusting bolt and located below the base plate, and the locking nut is screwed onto the upper end of the adjusting bolt. The height adjustment range is ±25mm by rotating the adjusting bolt, with an adjustment accuracy of up to 0.1mm. After adjustment, tighten the locking nut and attach the protective cover to complete the installation. The entire device can withstand a vertical load of 10000N and a horizontal load of 3000N, operates normally within a temperature range of -40℃ to +80℃, and exhibits excellent corrosion resistance and environmental adaptability. This embodiment has a simple structure, low manufacturing cost, is easy to use, has high adjustment accuracy, and good stability. It is suitable for the foot fixing needs of various engineering equipment, and is particularly suitable for the fixing installation of precision equipment and heavy machinery with high installation accuracy requirements.

[0043] Specifically, the principle of this utility model is as follows: Through innovative structural design and material selection, this utility model fundamentally solves the technical problems of low adjustment accuracy, poor structural stability, and susceptibility to environmental factors in existing anchor bolt fasteners. The core technical principle is reflected in the following aspects: First, a complete high-precision adjustment system is formed by combining a base plate, adjusting bolt, limiting ring, locking nut, and protective cover into a five-component design. The base plate, as the supporting foundation of the entire system, provides stable load distribution through its rectangular plate structure. The design of the four corner mounting holes enables standardized connection with the equipment base, and the concentric circular grooves on the upper surface and the grid-like protrusions on the lower surface significantly enhance friction. The threaded section of the adjusting bolt forms a precise threaded fit with the locking nut, achieving precise height adjustment through the thread pitch, with an adjustment accuracy reaching the 0.1mm level. The spiral groove design of the limiting ring works synchronously with the adjusting bolt, preventing excessive sinking of the adjusting bolt and ensuring the smoothness of the adjustment process. The spiral groove design of the conical tip enhances the gripping force with the ground, forming an effective self-locking mechanism. The protective cover fundamentally solves the problem of environmental factors affecting the internal structure, and the choice of PVC material balances weather resistance and economy. The entire system achieves a complementary material system through the rational combination of materials: the carbon steel base plate provides strength, the stainless steel adjusting bolts provide corrosion resistance, the brass limit rings provide wear resistance, and the alloy steel locking nuts provide high strength. This design principle enables the entire fastener to achieve the technical goals of high-precision adjustment, high stability, and strong environmental adaptability while maintaining structural simplicity.

[0044] In use, first place the base plate in the predetermined installation position and secure it to the equipment base through the mounting holes at the four corners, ensuring the base plate is level and stable. Then, place the limiting ring onto the adjusting bolt. The spiral groove on the inner surface of the limiting ring engages with the threaded section of the adjusting bolt, allowing the limiting ring to move up and down as the adjusting bolt rotates. Next, pass the adjusting bolt through the center through hole of the base plate, ensuring the conical tip of the adjusting bolt faces the ground, with the limiting ring positioned below the base plate. Screw the locking nut onto the threaded section of the adjusting bolt, initially adjusting it to the desired height. Use a wrench to hold the hexagonal operating section of the adjusting bolt and precisely adjust it to the required height. Clockwise rotation lowers the adjusting bolt, and counterclockwise rotation raises it. During adjustment, the limiting ring prevents the adjusting bolt from sinking excessively and ensures smooth adjustment. After adjustment, use a wrench to tighten the locking nut, ensuring it fits tightly against the upper surface of the base plate, forming a reliable locking mechanism. Finally, attach the protective cover to the base plate, ensuring it completely covers the base plate and lock nuts. The upper end of the adjusting bolt should protrude through the circular opening in the protective cover. The entire operation is simple and intuitive, with high adjustment precision and reliable fixation, suitable for rapid installation and adjustment needs in various engineering sites.

Claims

1. An adjustable anchor bolt fixing, characterised in that, include: The system comprises a base plate, an adjusting bolt, a limiting ring, a locking nut, and a protective cover. The base plate has a rectangular plate structure with a circular through hole at its geometric center. The diameter of the through hole is larger than the outer diameter of the adjusting bolt. The base plate is made of carbon steel. The adjusting bolt passes through the through hole in the base plate. The upper end of the adjusting bolt has a threaded section, the length of which is one-third of the total length of the adjusting bolt. The lower end of the adjusting bolt has a tapered tip with a cone angle of 60 degrees. The limiting ring is fitted around the middle of the adjusting bolt, and the inner diameter of the limiting ring is equal to the inner diameter of the adjusting bolt. The outer diameter of the bolt is matched, and the outer diameter of the limiting ring is larger than the diameter of the through hole in the base plate. The upper surface of the limiting ring is in contact with the lower surface of the base plate. The locking nut is threaded onto the threaded section of the adjusting bolt. The locking nut is located above the base plate, and an adjustment gap is formed between the bottom surface of the locking nut and the upper surface of the base plate. The protective cover is fastened above the base plate. The protective cover has an inverted frustum-shaped structure. The diameter of the large end of the protective cover matches the outer contour of the base plate. The small end of the protective cover has a circular opening, and the upper end of the adjusting bolt passes through the circular opening of the protective cover.

2. An adjustable anchor according to claim 1, wherein, The base plate has mounting holes at its four corners. The mounting holes are circular and have a diameter of 8mm to 12mm. The central axis of the mounting holes is parallel to the thickness direction of the base plate. The mounting holes are used to insert fixing bolts to connect and fix the base plate to the equipment.

3. An adjustable anchor bolt fastener according to claim 2, characterized in that, The adjusting bolt is made of stainless steel, with an outer diameter of 16mm to 24mm and a total length of 150mm to 300mm. The threaded section of the adjusting bolt uses standard metric threads of M16 to M24. The middle of the adjusting bolt has an operating section with a hexagonal cross-section, the length of which is 20mm to 40mm. The operating section is used for wrench clamping to achieve rotational adjustment of the adjusting bolt.

4. The adjustable anchor bolt fastener according to claim 3, characterized in that, The limiting ring is made of brass, and its axial height is 10mm to 20mm. The outer diameter of the limiting ring is 5mm to 15mm larger than the diameter of the through hole in the base plate. The inner surface of the limiting ring is provided with a spiral groove that matches the outer surface of the adjusting bolt. The pitch of the spiral groove is the same as the pitch of the threaded section of the adjusting bolt. The limiting ring and the adjusting bolt are connected by a threaded engagement through the spiral groove.

5. An adjustable anchor bolt fastener according to claim 4, characterized in that, The locking nut is made of alloy steel and has a hexagonal outer contour. The distance between opposite sides of the locking nut is 24mm to 36mm, and the axial height of the locking nut is 12mm to 25mm. The internal thread of the locking nut and the threaded section of the adjusting bolt form a tight fit. The bottom surface of the locking nut is provided with an annular groove with a depth of 2mm to 5mm.

6. An adjustable anchor bolt fastener according to claim 5, characterized in that, The protective cover is made of polyvinyl chloride plastic, with a wall thickness of 2mm to 5mm. The diameter of the large end of the protective cover is 10mm to 20mm larger than the outer contour of the base plate, and the opening diameter of the small end of the protective cover is 3mm to 8mm larger than the outer diameter of the adjusting bolt. The inner surface of the protective cover is provided with multiple longitudinal reinforcing ribs, with a height of 1mm to 3mm, and the reinforcing ribs are evenly distributed along the circumference of the protective cover.

7. An adjustable anchor bolt fastener according to claim 6, characterized in that, The upper surface of the base plate is provided with a plurality of concentric circular grooves. The depth of the concentric circular grooves is 1mm to 3mm, the spacing between the concentric circular grooves is 5mm to 10mm, and the concentric circular grooves are distributed outward from the geometric center of the base plate.

8. An adjustable anchor bolt fastener according to claim 7, characterized in that, The lower surface of the base plate is provided with grid-like protrusions, the height of which is 2mm to 4mm and the spacing of which is 8mm to 15mm. The grid-like protrusions form a regular square pattern on the lower surface of the base plate.

9. An adjustable anchor bolt fastener according to claim 8, characterized in that, The tapered tip of the adjusting bolt has a spiral groove on its surface. The depth of the spiral groove is 0.5 mm to 2 mm, and the pitch of the spiral groove is 5 mm to 10 mm. The spiral groove extends from the apex of the tapered tip toward the middle of the adjusting bolt.

10. An adjustable anchor bolt fastener according to claim 9, characterized in that, The outer surface of the limiting ring is provided with multiple radial protrusions. The height of the radial protrusions is 1mm to 3mm, the width of the radial protrusions is 3mm to 8mm, and the multiple radial protrusions are distributed at equal angles along the circumference of the limiting ring. The number of radial protrusions is 6 to 12.

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