A bolt structure with adjustable length

Abstract

The present invention discloses a bolt structure with adjustable length, comprising an upper screw head, a lower screw rod, an adjusting screw block and a locking block, wherein the upper screw head comprises an external hexagonal head at the upper end and a bolt smooth section at the lower end, a threaded hole is provided in the middle of the upper screw head, and the side wall of the threaded hole is provided with a plurality of evenly distributed connecting grooves; the lower screw rod comprises a connecting section at the upper end, an adjusting section in the middle and an externally threaded connecting section at the lower end, the outer side of the connecting end is provided with a connecting ridge that cooperates with the connecting groove, the adjusting screw block is sleeved on the outside of the adjusting section, the outside of the adjusting screw block cooperates with the threaded hole through a threaded structure, and the outside of the locking block is provided with an external thread that cooperates with the threaded hole; the bolt structure designed by the present invention realizes the adjustment of the bolt length through the locking block and the adjusting screw block, and the adjustment is convenient. When the bolt length is adjusted, the influence on the bolt strength is small. At the same time, the bolt structure is compact in design, easy to process, and suitable for mass production.

Description

Technical Field

[0001] The present invention relates to the technical field of bolt structures, and in particular to a bolt structure with adjustable length. Background Art

[0002] A bolt is a cylindrical, threaded fastener that fits a nut. It generally consists of a head and a shank. It is used in conjunction with a nut to securely connect two parts with through-holes. This type of connection is called a bolt connection. Removing the nut from the bolt allows the two parts to be separated, making bolt connections removable. Bolts are widely used in various mechanical devices and products and are a frequently used fastener. However, in reality, the length of the threaded shank of a bolt is generally fixed. Carrying bolts of varying lengths for different applications is crucial. Forgetting to carry the correct bolt length can prevent operators from continuing their work, causing significant inconvenience and failing to fully meet operational requirements.

[0003] Prior art, such as patent number "2017207171626", discloses a length-adjustable bolt, including an outer bolt, an inner bolt, and an adjusting bolt. The threaded rod of the outer bolt is provided with a rotation-stop groove along the axial direction, the head of the outer bolt is provided with a bolt groove, and the outer bolt is provided with a through hole connecting the rotation-stop groove and the bolt groove; the inner bolt is provided with a threaded hole extending therethrough along the axial direction; the inner bolt is installed in the rotation-stop groove, the head of the adjusting bolt is installed in the bolt groove, and the threaded rod of the adjusting bolt passes through the through hole and is installed in the threaded hole. In this prior art, the inner bolt is provided inside the outer bolt. Although the length of the bolt is adjustable, the sizes of the inner and outer bolts are different, and it is impossible to fit and tighten a threaded hole of a single size. At the same time, the inner bolt is adjusted by adjusting the length of the outer bolt by the adjusting bolt, so that a threaded hole is provided in the middle of the inner bolt, resulting in insufficient strength of the inner bolt. In response to the above problems, the present application provides a solution. Summary of the Invention

[0004] The purpose of the present invention is to provide a bolt structure with adjustable length.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions:

[0006] The lock block is provided with an external thread matching the threaded hole, and the upper end of the locking block is provided with a hexagonal head countersunk hole, and the locking block is installed in the threaded hole and pressed tightly against the upper end of the connecting section.

[0007] Furthermore, the adjusting screw block includes an adjusting male screw block and an adjusting female screw block, and the adjusting male screw block and the adjusting female screw block are composed of two halves separated along the diagonal line of a hollow hexagonal bolt structure, and the adjusting male screw block and the adjusting female screw block are connected by an assembly structure.

[0008] Furthermore, the assembling structure includes a positioning pin provided on the assembling surface of the adjusting male screw block and a positioning hole provided on the assembling surface of the adjusting female screw block, and the positioning pin and the positioning hole are interference fit.

[0009] Furthermore, the middle hole of the adjusting screw block and the adjusting section are clearance-matched, and the clearance size range is 0.4-0.8 mm.

[0010] Furthermore, the number of the connecting ridges and connecting grooves is 4.

[0011] In summary, the present invention has the following beneficial effects: the bolt structure designed in the present invention realizes the adjustment of the bolt length through the locking block and the adjusting screw block, which is convenient to adjust. When the bolt length is adjusted, the impact on the bolt strength is small. At the same time, the bolt structure is compact in design, easy to process, and suitable for mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a front view of the present invention;

[0013] Figure 2 is an exploded view of the present invention;

[0014] Figure 3 is a cross-sectional view of the present invention;

[0015] Figure 4 It is a structural schematic diagram of the upper screw head of the present invention;

[0016] Figure 5 It is a structural schematic diagram of the adjusting screw block of the present invention;

[0017] Figure 6 It is a structural schematic diagram of the lower screw of the present invention.

[0018] In the figure, 1. Upper screw head; 2. Lower screw; 3. Adjusting male screw block; 4. Adjusting female screw block; 5. Locking block; 6. Threaded hole; 7. Connecting groove; 8. Hexagonal countersunk hole; 9. Positioning hole; 10. External threaded connecting section; 11. Adjusting section; 12. Connecting section; 13. Bolt smooth section; 14. External hexagonal head; 15. Positioning pin; 16. Connecting ridge. DETAILED DESCRIPTION

[0019] The present invention will be further described in detail below with reference to the accompanying drawings.

[0020] like Figures 1-6 As shown, a length-adjustable bolt structure includes an upper screw head 1, a lower screw rod 2, an adjusting screw block and a locking block 5. The upper screw head 1 includes an outer hexagonal head 14 at the upper end and a bolt light section 13 at the lower end. A threaded hole 6 is provided in the middle of the upper screw head 1. The side wall of the threaded hole 6 is provided with a plurality of evenly distributed vertical connecting grooves 7. The connecting groove 7 is a rectangular groove, and the bottom of the groove is arranged in an arc shape. When the inner hole of the upper screw head 1 is processed, the connecting groove 7 is processed first, and then the threaded hole 6 is processed, and then the burrs inside the connecting groove 7 are removed. Even if the thread in the threaded hole 6 is blocked by the connecting groove 7, it does not affect the stability of the connection of the threaded hole 6; the lower screw rod 2 includes a connecting section 12 at the upper end, an adjusting section in the middle 11 and the externally threaded connecting section 10 at the lower end, the outer side of the connecting end 12 is provided with a connecting ridge 16 that cooperates with the connecting groove 7, the adjusting screw block is sleeved on the outside of the adjusting section 11, the adjusting screw block can increase the strength of the adjusting section 11, the outside of the adjusting screw block cooperates with the threaded hole 6 through a threaded structure, the outside of the externally threaded connecting section 10 is provided with an external thread, the diameter of the bolt light section 13 of the upper screw head 1 is smaller than the diameter of the externally threaded connecting section 10, the outside of the locking block 5 is provided with an external thread that cooperates with the threaded hole 6, the upper end of the locking block 5 is provided with a hexagonal countersunk hole 8, which can be tightened or loosened by a hexagonal wrench, and the locking block 5 is installed in the threaded hole 6 and pressed against the upper end of the connecting section 12.

[0021] Further, as Figure 5As shown, the adjusting screw block includes an adjusting male screw block 3 and an adjusting female screw block 4, and the adjusting male screw block 3 and the adjusting female screw block 4 are composed of two halves separated along one of the diagonal lines of a hollow hexagonal bolt structure, and the adjusting male screw block 3 and the adjusting female screw block 4 are connected by an assembling structure. Preferably, the assembling structure includes a locating pin 15 provided on the assembling surface of the adjusting male screw block 3 and a locating hole 9 on the assembling surface of the adjusting female screw block 4, and the locating pin 15 is interference fit with the locating hole 9, wherein the positions of the locating hole 9 and the locating pin 15 are provided at both ends of the assembling surface, specifically as shown in 5; adjusting When processing the segment screw block, the blanks of the adjusting male screw block 3 and the adjusting female screw block 4 are first produced by mold forming, and then the positioning holes 9 and the positioning pins 15 are processed on the blanks. Then the adjusting male screw block 3 and the adjusting female screw block 4 are assembled together through the positioning holes 9 and the positioning pins 15 to form a blank in the shape of an external hexagonal bolt. The threaded surface is then surface treated and then tapped. The two screw blocks are then separated to remember the processed adjusting male screw block 3 and the adjusting female screw block 4. The processed adjusting male screw block 3 and the adjusting female screw block 4 are sleeved on the outside of the adjusting section 11 through the interference fit between the positioning pins 15 and the positioning holes 9.

[0022] Furthermore, the gap between the middle hole of the adjusting screw block and the adjusting section 11 is matched, and the gap size range is 0.4-0.8mm. This gap size setting protects the outside of the adjusting section 11 while ensuring that the adjusting screw block does not interfere with the adjusting section 11 when rotating and adjusting, thereby improving the strength of the adjusting section 11 and thus improving the overall strength of the bolt.

[0023] Furthermore, the number of the connecting ribs 16 and the connecting grooves 7 is 4. Similarly, the number of the connecting grooves 7 can be other numbers, and the connecting grooves 7 and the connecting ribs 16 can be replaced by transmission structures such as splines.

[0024] Working principle: When adjusting the bolt length, first loosen the locking block 5, then use a wrench to select the hexagonal head at the lower end of the adjusting screw block, thereby adjusting the thread matching length between the adjusting screw block and the upper screw head 1, and then tighten the locking block 5 so that the upper and lower ends of the connecting end 12 are respectively locked with the locking block 5 and the upper end of the adjusting screw block, and the adjusting screw block is protected on the outside of the adjusting section 11, thereby improving the strength of the bolt structure as a whole.

[0025] This specific embodiment is merely an explanation of the present invention and is not intended to limit the present invention. After reading this specification, those skilled in the art may make non-creative modifications to this embodiment as needed. However, as long as such modifications are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A length-adjustable bolt structure, characterized in that: The invention comprises an upper screw head (1), a lower screw rod (2), an adjusting screw block and a locking block (5), wherein the upper screw head (1) comprises an external hexagonal head (14) at the upper end and a bolt light section (13) at the lower end, a threaded hole (6) is provided in the middle of the upper screw head (1), and a plurality of evenly distributed connecting grooves (7) are provided on the side wall of the threaded hole (6); the lower screw rod (2) comprises a connecting section (12) at the upper end, an adjusting section (11) in the middle and an externally threaded connecting section (10) at the lower end, a connecting ridge (16) is provided on the outer side of the connecting end (12) and matched with the connecting groove (7), the adjusting screw block is sleeved on the outer side of the adjusting section (11), and the outer side of the adjusting screw block is matched with the threaded hole (6) through a threaded structure, and the outer side of the adjusting screw block is matched with the threaded hole (6) through a threaded structure. The threaded connection section (10) is provided with an external thread on the outside, the bolt light section (13) of the upper screw head (1) has a diameter smaller than the diameter of the external threaded connection section (10), the locking block (5) is provided with an external thread on the outside that matches the threaded hole (6), the upper end of the locking block (5) is provided with a hexagonal countersunk hole (8), the locking block (5) is installed in the threaded hole (6) and pressed against the upper end of the connection section (12); the adjusting screw block includes an adjusting male screw block (3) and an adjusting female screw block (4), the adjusting male screw block (3) and the adjusting female screw block (4) are composed of two halves of a hollow hexagonal bolt structure separated along a diagonal line, and the adjusting male screw block (3) and the adjusting female screw block (4) are connected by an assembled structure.

2. The length-adjustable bolt structure according to claim 1, characterized in that: The assembly structure comprises a positioning pin (15) provided on the assembly surface of the adjusting male screw block (3) and a positioning hole (9) on the assembly surface of the adjusting female screw block (4), wherein the positioning pin (15) and the positioning hole (9) are interference-fitted.

3. The length-adjustable bolt structure according to claim 2, characterized in that: The middle hole of the adjusting screw block and the adjusting section (11) are clearance-matched, and the clearance size range is 0.4-0.8 mm.

4. The length-adjustable bolt structure according to claim 3, characterized in that: The number of the connecting ridges (16) and connecting grooves (7) is four.

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