Cross bolt and D-shaped shackle including the same

Abstract

The invention discloses a cross bolt and a D-shaped shackle containing the same. The cross bolt comprises: a bolt rod, a flange stopper at the bolt rod head, and a limit stopper at the bolt rod tail. A through hole is arranged at the bolt rod tail, and the middle of the through hole expands outward to form a cavity. The limit stopper comprises: a spring placed in the cavity, a cap sleeved at the bolt rod tail, and two safety pins. The safety pin comprises a cross baffle and a vertical rod. The two cross baffles are respectively located at the two ends of the spring, and the two vertical rods extend into the through holes at the two ends of the cavity respectively. The cap is rotatably hinged at the bolt rod tail, and two pin holes for passing the vertical rods are symmetrically arranged on the cap. When the pin hole is aligned with the through hole, the vertical rod extends out of the through hole. When the vertical rod is pressed and the cap is rotated to stagger the pin hole with the through hole, the end of the vertical rod is sealed in the through hole. The invention has a simple structure. By screwing the cap, the safety pin can be easily and quickly retracted into the bolt rod or ejected from the bolt rod, so as to avoid the problem that the cross bolt is easy to loosen and slip during use, and the cross bolt and the safety pin are easy to lose, thereby ensuring safety and saving costs.

Description

Technical Field

[0001] The present invention relates to the technical field of construction tools, and particularly to a cross bolt and a D-shaped shackle including the same. Background Art

[0002] A shackle is a type of rigging used to connect with fittings. Due to its small size and large load-bearing capacity, shackles are widely used in various industries such as electric power, metallurgy, petroleum, machinery, railway, highway, chemical industry, port, mine and construction. Its material is generally made of high-strength steel, and the surface treatment generally adopts galvanizing or painting to prevent rust and corrosion. Shackles are classified into bow-shaped and D-shaped according to their types.

[0003] For safety considerations, shackles with large weight and large volume are generally not installed at positions that are frequently disassembled. When selecting a shackle, attention needs to be paid to the safety factor. Generally, the safety factors are 4 times, 6 times and 8 times. When using, the rated load must be strictly observed. Excessive frequent use or overloading will bring safety hazards. It can be seen that the safety in use is a factor that cannot be ignored for shackles. For the D-shaped shackles on the current market, the cross bolt generally adopts a bolt lock. Under long-term vibration or shaking, the thread connection of the cross bolt may become loose, the safety factor is reduced, and even safety accidents may occur. There are also some cross bolts in D-shaped shackles that use components such as split pins for limit fixation. However, in this way, the split pin is separated from the cross bolt, and the split pin is very easy to fall off, resulting in safety hazards.

[0004] In view of this, the existing cross bolts and shackles should be improved to solve the above-mentioned technical problems existing in the prior art. Summary of the Invention

[0005] Based on the above problems, the purpose of the present invention is to provide a cross bolt with a simple structure and convenient operation and a D-shaped shackle including the same. By screwing the sleeve cap, the safety pin can be conveniently and quickly retracted into the bolt rod or ejected from the bolt rod to play a blocking and limiting role, which can avoid problems such as the cross bolt in the D-shaped shackle of the prior art being easily loosened and slipped during use, and the cross bolt and the safety pin being easily lost. The present invention not only ensures the safety during use, but also saves costs and avoids property losses.

[0006] The above object of the present invention is achieved by the following technical solutions:

[0007] According to one aspect of the present invention, a cross bolt provided by the present invention includes: a bolt rod, a flange block fixedly connected to the head of the bolt rod, and a limit blocking member installed at the tail of the bolt rod, wherein,

[0008] a through hole penetrating up and down is provided at the tail of the bolt rod, and a cavity is formed inside the bolt rod after the middle part of the through hole expands outwards;

[0009] The position-limiting stopper comprises: a spring vertically placed in the cavity, a cap sleeved on the tail of the bolt rod, and two safety pins, wherein:

[0010] The safety pin comprises: a transverse baffle and a vertical rod fixed on the transverse baffle, the transverse baffles of the two safety pins are respectively located at the two ends of the spring, and the two vertical rods extend into the through holes located at the two ends of the cavity respectively;

[0011] The cap is rotatably hinged at the tail of the bolt rod, and the cap is provided with two symmetrical pin holes for passing the safety pin vertical rod. When the pin holes are aligned with the through hole, the vertical rod extends out of the through hole. When the vertical rod is pressed and the cap is rotated to stagger the pin hole and the through hole, the end of the vertical rod is sealed in the through hole.

[0012] Further, the two transverse baffles are fixedly connected to the two ends of the spring respectively; or, the two transverse baffles are against the two ends of the spring.

[0013] Furthermore, the tail of the bolt rod is in a bullet shape, and the shape of the sleeve cap is adapted to the tail of the bolt rod. Specifically, the end of the bolt rod is a tapered end. The sleeve cap includes: a smooth hemispherical shape at the top and a straight sleeve connected to the hemispherical shape, the hemispherical shape is sleeved on the tapered end, and the straight sleeve is sleeved on the outer peripheral side of the bolt rod.

[0014] Furthermore, the top of the cap is hinged to the tail of the bolt rod through a bolt. Furthermore, the bolt is located at the top of the cap.

[0015] Furthermore, a knob for rotating the cap is fixedly disposed on the outer surface of the cap. Furthermore, the knob can be fixedly disposed on the cap around the apex of the cap.

[0016] Furthermore, a tail plate is fixedly connected to the flange stopper, and the tail plate is fan-shaped.

[0017] Furthermore, a hole is provided at the center of the tail plate for inserting a screwing tool.

[0018] According to another aspect of the present invention, the present invention provides a D-type shackle, comprising: a U-shaped body, and the cross bolt as described above, wherein:

[0019] The two ends of the body are respectively provided with ear holes;

[0020] The cross bolt is passed through the two ear holes, and the flange stopper of the cross bolt is positioned on the outside of one ear hole, and the vertical rod of the safety pin extends out of the through hole and is stuck on the outside of the other ear hole.

[0021] Furthermore, a turnbuckle for threaded connection with the ear hole is circumferentially arranged on the bolt rod located at the head of the horizontal bolt.

[0022] Furthermore, spherical structures are provided at the front end of the body (i.e., the two ends of the U-shaped body), and the ear holes are provided in the spherical structures.

[0023] Compared with the prior art, in the present invention, the bolt rod of the cross bolt and the safety pin are integrally designed. The safety pin is placed in the bolt rod. By rotating the cap, the safety pin can be conveniently and quickly retracted into the bolt rod, or ejected from the bolt rod under the action of a spring. This cross bolt can be used to connect two components or applied to a shackle. The cross bolt can not only be easily inserted into the ear hole of the D-shaped shackle, but also play a role in limiting and blocking to prevent falling off outside the ear hole, thus avoiding the problems that the cross bolt in the D-shaped shackle in the prior art is prone to loosen and slip during use, and the cross bolt and the safety pin are easily lost. It can not only ensure safety during use, but also save costs and avoid property losses. The present invention has the advantages of simple and compact structure and convenient operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a cross-sectional view of the safety pin in the cross bolt of the present invention in a closed state;

[0025] Figure 2 is a cross-sectional view of the safety pin in the cross bolt of the present invention in an open state;

[0026] Figure 3 is a schematic structural view of the physical object of the D-shaped shackle of the present invention;

[0027] Figure 4 is a schematic structural view of the through hole and the cavity at the tail of the bolt rod in the cross bolt of the present invention.

[0028] Figures 1 - 4 In the figures, 10 is the body, 11 is the spherical structure, 12 is the ear hole, 20 is the cross bolt, 21 is the bolt rod, 22 is the flange stopper, 23 is the tail plate, 24 is the screw thread, 251 is the through hole, 252 is the cavity, 253 is the spring, 254 is the safety pin, 255 is the cap, 256 is the knob, 257 is the bolt. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way limits the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0030] Figure 1 and Figure 2Cross-sectional views of the safety pin in the closed state and the open state in the cross bolt according to the embodiments of the present invention are respectively schematically shown. Figure 4 The structures of the through hole and the cavity in the bolt rod of the cross bolt according to the embodiments of the present invention are schematically shown.

[0031] As Figure 1 、 2 、shown in 4, a cross bolt 20 includes: a bolt rod 21, a flange stopper 22 fixedly connected to the head of the bolt rod 21, and a limit blocking member installed at the tail of the bolt rod 21. Among them, the limit blocking member includes a spring 253, a cap 255, and two safety pins 254. The bolt rod 21 of the cross bolt 20 of the present invention is integrally designed with the safety pin 254. By rotating the cap 255, the safety pin 254 can be conveniently and quickly retracted into the bolt rod 21 or ejected from the bolt rod 21 under the action of the spring 253.

[0032] As Figure 4 shown, a through hole 251 penetrating up and down is provided at the tail of the bolt rod 21. The middle part of the through hole 251 expands outward to form a cavity 252, and the cavity 252 is located inside the bolt rod 21. The through holes 251 above and below the cavity 252 are symmetrical. The bolt rod 21 is generally cylindrical, and the through hole 251 is arranged to penetrate up and down from the side of the bolt rod 21. Specifically, the through hole 251 can be a cylindrical hole with a smaller diameter, and the cavity 252 can be a cylindrical shape with a larger diameter. The cavity 252 is located in the middle of the through hole 251 and is coaxial with the through hole 251, so that steps for forming a cross baffle that can catch the safety pin 254 are formed at the top and bottom of the cavity 252 and the through hole 251. The tail of the bolt rod 21 can be set in a bullet shape, that is, the end of the bolt rod 21 can be a conical end. Further, the sides of the tail and the middle of the bolt rod 21 can be set as smooth surfaces, so that it can be more conveniently and smoothly inserted into the ear hole 12 of the D-shaped shackle during application.

[0033] In the present invention, the limit blocking member includes: a spring 253 vertically placed in the cavity 252, a cap 255 sleeved on the tail of the bolt rod 21, and two safety pins 254 located at both ends of the spring 253.

[0034] Among them, the spring 253 is vertically placed in the cavity 252 in the middle of the bolt rod 21. The longest length of the spring 253 in the cavity 252 is less than the extended length of the spring 253 in the natural state. The diameter of the spring 253 can be larger than the diameter of the through hole 251 to give an appropriate thrust to the cross baffle and ensure that the safety pin 254 can be smoothly ejected from the through hole 251 to play a role in preventing the cross bolt 20 from loosening.

[0035] The safety pin 254 is a T-shaped structure, including: a transverse baffle and a vertical rod fixedly arranged on the transverse baffle, wherein the transverse baffles of the two safety pins 254 are respectively located at the two ends of the spring 253, and the two vertical rods extend into the through holes 251 located at the two ends of the cavity 252. Further, the two transverse baffles can be fixedly connected to the two ends of the spring 253 respectively; or, the two transverse baffles are directly pressed against the two ends of the spring 253. Preferably, the transverse baffle is circular, and the vertical rod is a round rod, for example, a cylindrical threadless bolt, including a nut and a screw, the nut is equivalent to the transverse baffle, and the screw is equivalent to the vertical rod. Furthermore, the size of the cross baffle is adapted to the size of the cavity 252, and the diameter of the cross baffle is equal to or slightly smaller than the diameter of the cavity 252; the size of the vertical rod is adapted to the size of the through hole 251, and the diameter of the vertical rod is equal to or slightly smaller than the diameter of the through hole 251; in addition, the cross baffle cannot enter the through hole 251, a part of the vertical rod can enter the cavity 252, but the end of the vertical rod always remains in the through hole 251; the above-mentioned slightly smaller is generally less than 0 to 0.2 mm. The present invention does not specifically limit the length of the vertical rod and the length of the vertical rod extending out of the through hole 251, which can be specifically determined according to the size of the bolt rod 21, the cavity 252, the through hole 251, the spring 253, etc. The height of the vertical rod after extending out of the through hole 251 is sufficient to play a limiting blocking role. The T-shaped safety pin 254 is built-in, that is, the safety pin 254 is limited in the bolt rod 21 and becomes a whole with the bolt rod 21. It can not only play a good limiting role to prevent the Bailey pin from falling off, but also facilitate management and avoid the problem of loss, damage or even breakage of the safety pin 254.

[0036] The cap 255 is sleeved on the tail of the bolt rod 21 and is rotatably hinged on the tail of the bolt rod 21. The cap 255 is provided with two symmetrical pin holes for passing the vertical rod of the safety pin 254. When the pin holes are aligned with the through hole 251, the vertical rod extends out of the through hole 251. When the vertical rod is pressed and the cap 255 is rotated to make the pin hole and the through hole 251 staggered, the end of the vertical rod is sealed in the through hole 251. The shape of the cap 255 is adapted to the tail of the bolt rod 21. Specifically, the cap 255 includes: a smooth hemispherical shape at the top and a straight sleeve connected to the hemispherical shape. The hemispherical shape is sleeved on the conical end, i.e., the top of the bullet head, and the straight sleeve is sleeved on the outer peripheral side of the bolt rod 21. Two pin holes are arranged through the straight sleeve, and the size of the pin holes is adapted to the size of the vertical rod of the safety pin 254, and can be slightly larger than the size of the vertical rod. Preferably, as Figure 1 and 2 As shown, the pin hole is located in the middle of the straight sleeve, and the pin hole is a certain distance away from the end of the straight sleeve and the hemispherical end.

[0037] In an alternative embodiment, the top of the cap 255 may be hinged to the tail of the bolt rod 21 by a dowel 257, but is not limited thereto. For example, the dowel 257 may be fixed to the tip of the bullet nose, a hole may be provided at the vertex of the cap 255, and the hole may be sleeved on the dowel 257, so that the cap 255 can rotate around the tail of the bolt rod 21 at the tail.

[0038] In an alternative embodiment, a knob 256 for rotating the cap 255 is fixedly provided on the outer surface of the cap 255. Further, the knob 256 may be provided at the vertex of the cap 255 to facilitate screwing the cap 255 and make the force more uniform. For example, the knob 256 is fixed around the connection between the cap 255 and the dowel 257. The knob 256 may be cylindrical to facilitate rotating the cap 255 around the cross bolt 20. Further, a groove may be provided at one end of the cylinder to accommodate the dowel 257, and the outer periphery of the groove is fixed to the cap 255.

[0039] In an alternative embodiment, as Figures 1 - 2 shown, a tail plate 23 for screwing the cross bolt 20 may be fixedly provided outside the flange block 22. For example, welding may be used for fixation. The shape of the tail plate 23 may be fan-shaped or circular, etc., to facilitate screwing. In addition, the maximum dimension of the tail plate 23 may be larger than the diameter of the flange block 22 to further play a role in blocking and positioning. Preferably, a hole for inserting a screwing tool may be provided at the center of the tail plate 23. For example, a screwdriver is inserted into the hole to tighten the cross bolt 20.

[0040] In an alternative embodiment, as Figures 1 - 2 shown, multiple turns of screw threads 24 may be circumferentially provided at the head of the bolt rod 21 and inside the flange block 22, so that when applied to a D-shaped shackle, it can be threadedly connected to one of the ear holes 12 to improve the installation firmness and further improve the use safety of the D-shaped shackle. The D-shaped shackle of the present invention not only blocks through the safety pin 254 in the limit blocking member, but also threadedly / thread-connects the cross bolt 20 and the ear hole 12, thus playing a double insurance role.

[0041] Figure 3 Schematically shows the physical structure of the D-shaped shackle in the embodiment of the present invention. As Figure 3 shown, a D-shaped shackle includes: a U-shaped body 10, and the cross bolt 20 as described above.

[0042] Wherein, ear holes 12 are respectively arranged at two end portions of the body 10; the cross bolt 20 is inserted through the two ear holes 12, and the flange stopper 22 of the cross bolt 20 is positioned outside one ear hole 12, and the vertical rod of the safety pin 254 extends out of the through hole 251 and is stuck outside the other ear hole 12. In the present invention, the safety pin 254, the cross bolt 20, and the entire shackle can be made of high-strength alloy steel.

[0043] Threaded holes matching the screw threads 24 at the head of the bolt rod 21 are arranged on the inner side of the ear hole 12 near the flange stopper 22 for threaded connection therewith, so as to improve the installation firmness of the shackle and the use safety of the shackle.

[0044] In order to further ensure the installation firmness of the shackle, spherical structures 11 can be respectively arranged at two end portions of the body 10, and the ear holes 12 are arranged in the spherical structures 11. Wherein, the diameter of the spherical structure 11 is larger than the diameter of the body 10. The ear holes 12 can be arranged as circular holes so that the cross bolt 20 can be inserted to seal the shackle.

[0045] Next, refer to Figure 3 A specific embodiment is used to describe the structure of the D-shaped shackle of the present invention.

[0046] Taking 32 the D-shaped shackle as an example, the D-shaped shackle is made of 16Mn steel; the D-shaped shackle is 150 mm long, the net opening distance of the D-shaped shackle is 49 mm, the net depth of the D-shaped shackle is 90 mm, and the diameter of the U-shaped body 10 is 24 mm.

[0047] The head of the cross bolt 20 has a flange stopper 22 with a diameter of 80 mm and a thickness of 3 mm, and a fan-shaped tail plate 23 is arranged on the outside thereof to facilitate screwing in the cross bolt 20. A small hole with a diameter of 3 mm is arranged at the center of the tail plate 23 to facilitate inserting a screwdriver to tighten the cross bolt 20. The tail of the cross bolt 20 is in a bullet head shape, and the middle and tail of the cross bolt 20 are smooth surfaces to facilitate the installation of the cross bolt 20.

[0048] The diameter of the spherical structure 11 at the end of the body 10 is 100 mm, the wall thickness is 36 mm, and the inner diameters of the two ears, i.e., the ear holes 12, are 28 mm. The diameter of the cross bolt 20 is 28 mm, the total length of the cross bolt 20 is 157 mm, the cross bolt 20 has a screw thread 24 with a nominal diameter of 32, the thread pitch can be 2 mm, and the thread length of the screw thread 24 can be 30 mm.

[0049] The diameter of the safety pin 254 is 6 mm, and it can also be made of high-strength alloy steel. The total length of each safety pin 254 can be 10 mm. Among them, the length of the vertical rod is 7 mm, the thickness of the transverse baffle is 3 mm, and the diameter of the transverse baffle is 10 mm. The diameter of the cavity 252 is 10 mm, and the diameter of the through hole 251 can be 6 mm. The diameter of the spring 253 is 10 mm, and the extended length in the natural state is 10 mm. The height of the cavity 252 is specifically determined according to the length of the safety pin 254, the length of the vertical rod protruding from the surface of the bolt rod 21, and the thickness of the transverse baffle, etc. The wall thickness of the cap 255 outside the bullet head of the bolt rod 21 is 2 mm, and the diameter of the two symmetric pin holes on the cap 255 is 6 mm. It should be noted that the dimensions between the components in the present invention are mutually coordinated. Although the dimensions of the above-mentioned outer components and inner components are the same, generally, the dimensions of the outer components can be slightly larger than those of the inner components, but the error is controlled within the range of 0 to 0.2 mm.

[0050] In the non-working state, press the safety pin 254 of the cross bolt 20 from both ends, press the bolt rod 21 completely into the through hole 251, and then rotate the cap 255 so that the pin hole is misaligned with the through hole 251, thereby sealing the safety pin 254 inside the bolt rod 21. In the working state, rotate the cap 255 to align the pin hole of the cap 255 with the through hole 251. The safety pin 254 can pop out to a certain height on the side of the bolt rod 21 under the action of the spring 253 to play a limiting and blocking role to prevent the cross bolt 20 from falling off.

[0051] The description of the present invention has been given for purposes of illustration and description, and is not intended to be exhaustive or to limit the invention to the disclosed form. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments were chosen and described in order to best explain the principles of the invention and its practical application, and to enable those of ordinary skill in the art to understand the invention and design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A horizontal bolt, characterized in that, include: A bolt rod, a flange stopper fixedly connected to the bolt rod head, and a limit stopper installed at the bolt rod tail, wherein: The rear end of the bolt rod is provided with a through hole penetrating vertically, and the middle part of the through hole is expanded outward to form a cavity inside the bolt rod; The position-limiting stopper comprises: a spring vertically placed in the cavity, a cap sleeved on the tail of the bolt rod, and two safety pins, wherein: The safety pin comprises: a transverse baffle and a vertical rod fixed on the transverse baffle, the transverse baffles of the two safety pins are respectively located at the two ends of the spring, and the two vertical rods extend into the through holes located at the two ends of the cavity respectively; The cap is rotatably hinged at the tail of the bolt rod. The cap is provided with two symmetrical pin holes for passing the safety pin vertical rod. When the pin holes are aligned with the through hole, the vertical rod extends out of the through hole. When the vertical rod is pressed and the cap is rotated to make the pin holes and the through hole staggered, the end of the vertical rod is sealed in the through hole. A screw buckle for threaded connection with the ear hole of the D-type shackle is circumferentially arranged on the bolt rod at the head.

2. The horizontal bolt according to claim 1, characterized in that, The tail of the bolt rod is in a bullet shape, and the shape of the sleeve cap is matched with the tail of the bolt rod.

3. The horizontal bolt according to claim 2, characterized in that, The top of the sleeve cap is hinged to the tail of the bolt rod through a bolt.

4. The horizontal bolt according to claim 3, characterized in that, The peg is located at the apex of the cap.

5. The horizontal bolt according to claim 1, characterized in that, A knob for rotating the cap is fixedly arranged on the outer surface of the cap.

6. The horizontal bolt according to claim 1, characterized in that, The flange stopper is fixedly connected with a tail plate, and the tail plate is fan-shaped.

7. The horizontal bolt according to claim 6, characterized in that, A hole is provided at the center of the tail plate for inserting a screwing tool.

8. A D-shaped shackle, characterized in that, include: A U-shaped body, and a cross bolt as claimed in any one of claims 1 to 7, wherein: The two ends of the body are respectively provided with ear holes; The cross bolt is passed through the two ear holes, and the flange stopper of the cross bolt is positioned at the outer side of one ear hole, and the vertical rod of the safety pin is clamped at the outer side of the other ear hole.

9. The D-shaped shackle according to claim 8, characterized in that, Two ends of the body are respectively provided with spherical structures, and the ear holes are arranged in the spherical structures.

Images