Quick release expansion device

Abstract

A quick-release expansion device, characterized in that it includes a core rod, a cam handle, a spring, an end cover and an expansion assembly, wherein the cam handle is rotatably connected to one end of the core rod, and the end cover can be connected to the other end of the core rod; the expansion assembly is movably sleeved on the core rod, and can expand outwards and contract inwards to hold the core rod under the action of the cam handle; one end of the spring is connected to the cam handle, and a connecting hole is provided on the other end of the spring; the quick-release expansion device of the present invention can only be inserted into the end cover for closing when the end cover is installed in place, and when the end cover is not installed in place, the spring cannot be inserted into the end cover for closing, thus effectively avoiding the potential safety hazard when the mounting is not in place. The quick-release expansion device of the present invention can be locked, connected and disassembled by simple cam handle operation, has strong safety, simple operation, strong practicality and novelty, and should be vigorously promoted.

Description

[Technical field]

[0001] The invention relates to a connecting piece, in particular to a quick-release expansion device. [Background technology]

[0002] With the rapid development of the aerospace industry, the working environment of aerospace products is becoming increasingly harsh. Ordinary threaded connection pairs cannot meet the use requirements of existing aerospace products. High-performance, adjustable and high-matching precision threaded connection pairs are the general trend. In the design of aerospace parts, it is necessary to reduce the radial clearance of the threaded connection pair to achieve adjustable transition fit or interference fit between the bolt product and the substrate. It is difficult for existing bolt connectors to meet the design requirements, and the processing cost of the bolts is relatively expensive, and it is not possible to achieve multiple assembly and disassembly cycles. However, since the radial dimensions of the tension bolts can be adjusted, it will not affect the lubrication and anti-corrosion coating on the surface of the bolts and the substrate, and can be assembled and disassembled multiple times. At the same time, it can avoid the wear between the bolts and the substrate causing gaps in the assembly, so it is widely used in the aerospace field for fastening connections. However, the existing tension bolts are generally complicated to operate, especially for objects to be connected that require hanging beams, and it is impossible to quickly achieve connection and locking through simple operations. [Summary of the invention]

[0003] The present invention aims to solve the above problems and provide a quick-release expansion device which is easy to operate, reliable in connection, can quickly perform axial locking and avoids misoperation.

[0004] To solve the above problems, the present invention provides a quick-release expansion device, characterized in that it includes a core rod, a cam handle, an expansion assembly, a spring sheet and an end cover, the core rod being in the shape of a long axis; the cam handle is rotatably connected to one end of the core rod; the expansion assembly is movably sleeved on the core rod, which can be squeezed to expand outward and shrink inward to hold the core rod; one end of the spring sheet is connected to the cam handle, and the other end is provided with a connecting hole; the end cover can be connected to the end portion of the core rod opposite to the cam handle; when the end cover is in a first position, the end cover can move along the axial direction of the core rod and detach from the core rod, and the spring sheet cannot be inserted into the end cover through its connecting hole; when the end cover is in a second position, the end cover forms an axial limit connection with the end portion of the core rod and cannot detach from the core rod along the axial direction of the core rod, and the spring sheet can be inserted into the end cover through its connecting hole.

[0005] Furthermore, a guide groove arranged axially and a limit groove arranged circumferentially are provided on the outer wall of the end of the core rod, the guide groove extends axially from the end of the core rod, and the limit groove is connected with the guide groove; an axial hole is provided on the end cover, and a protruding positioning portion is provided on the inner wall of the axial hole, the positioning portion can be inserted into the guide groove and can be rotated from the guide groove to the limit groove; when the positioning portion of the end cover is located in the guide groove, the end cover is in a first position state; when the positioning portion of the end cover is located in the limit groove, the end cover is in a second position state.

[0006] Furthermore, the end cover includes an integrally formed cover plate portion and a connecting portion, the outer dimension of the cover plate portion is larger than the outer dimension of the connecting portion, and a first limiting step is formed at the junction thereof; the axial hole extends axially from the end of the cover plate portion and passes through the connecting portion.

[0007] Furthermore, the core rod includes an integrally formed core rod body and a limiting connecting column, a second limiting step is formed at the junction of the limiting connecting column and the core rod body; the guide groove and the limiting groove are provided on the limiting connecting column; and the expansion assembly is sleeved on the core rod body.

[0008] Furthermore, the core rod body includes an integrally formed cam connecting part, a cylindrical part and a truncated cone part; the cylindrical part is located between the cam connecting part and the truncated cone part; the cam connecting part is rotatably connected to the cam handle; the expansion assembly is movably sleeved on the cylindrical part; the end diameter of the truncated cone part away from the cylindrical part is larger than the diameter of the cylindrical part; the limiting connecting column is vertically formed on the end face of the truncated cone part and is coaxial with the truncated cone part.

[0009] Furthermore, the end cover is connected to the spring piece through a safety rope.

[0010] Furthermore, the expansion assembly includes an end cone sleeve, an outer cone sleeve and an inner cone sleeve, the end cone sleeve is movably mounted on the core rod and can be deformed radially; the end cone sleeve is adjacent to the cam handle; the outer cone sleeve is movably mounted on the core rod and can be deformed radially; the outer cone sleeve is located between the end cone sleeve and the end of the core rod for connecting the end cover; the outer cone sleeve cooperates with the end cone sleeve through the conical surface of the end; the inner cone sleeve is movably mounted on the core rod and can be deformed radially; the inner cone sleeve is located between two adjacent outer cone sleeves, and cooperates with the outer cone sleeve through the conical surface of the end; when the cam handle rotates around the core rod and squeezes the end cone sleeve, the end cone sleeve, the outer cone sleeve and the inner cone sleeve are squeezed against each other, so that the end cone sleeve and the inner cone sleeve shrink inward and hold the core rod, and the outer cone sleeve expands outward.

[0011] Furthermore, the end cone sleeve includes a conical portion and a convex portion integrally formed on the end of the conical portion, the convex portion protrudes from the end of the conical portion and faces the cam handle; a first conical surface is provided on the outer wall of the conical portion, and the first conical surface is formed by the outer wall of the end of the conical portion tilting outward to the convex portion.

[0012] Furthermore, the outer cone sleeve is provided with a second opening extending axially and passing through both ends thereof, and the inner walls at both ends of the outer cone sleeve are respectively provided with second conical surfaces, which are formed by the inner walls of the end portions of the outer cone sleeve being inclined inwardly.

[0013] Furthermore, the inner tapered sleeve is provided with a third opening extending axially and penetrating through both ends thereof, and the outer walls at both ends of the inner tapered sleeve are respectively provided with third tapered surfaces, and the third tapered surfaces are formed by the outer walls of the end portions of the inner tapered sleeve being inclined outwards.

[0014] The beneficial contribution of the present invention is that it effectively solves the above-mentioned problems. The quick-release expansion device of the present invention includes a core rod, a cam handle, a spring, an end cover and an expansion assembly. The cam handle is rotatably connected to one end of the core rod, and the end cover can be connected to the other end of the core rod; the expansion assembly is movably sleeved on the core rod, and it can expand outward and contract inward under the action of the cam handle to hold the core rod tightly; one end of the spring is connected to the cam handle, and a connecting hole is provided on the other end of the spring; the quick-release expansion device of the present invention can only be inserted into the end cover for closing when the end cover is installed in place, and when the end cover is not installed in place, the spring cannot be inserted into the end cover for closing, thus effectively avoiding the potential safety hazard when the mounting is not in place. The quick-release expansion device of the present invention can be locked, connected and disassembled by simple cam handle operation. It has strong safety, simple operation, strong practicality and novelty, and should be vigorously promoted.

Brief Description of the Drawings

[0015] Figure 1 It is a schematic diagram of the overall structure when closed.

[0016] Figure 2 It is a cross-sectional view when closed.

[0017] Figure 3 It is a schematic diagram of the overall structure decomposition.

[0018] Figure 4 It is a schematic structural diagram of the core rod 10 and the end cover 50.

[0019] Figure 5 Schematic diagram of the structure of the end cover 50.

[0020] Figure 6 This is a schematic diagram of the principle when it is opened.

[0021] Figure 7This is a schematic diagram of the principle when closed.

[0022] Figure symbols: core rod 10, limiting connecting column 11, guide groove 111, limiting groove 112, core rod body 12, cam connecting part 121, rotating shaft hole 1211, cylindrical part 122, truncated cone part 123, second limiting step 13, cam handle 20, cam part 21, extension part 22, expansion assembly 30, end cone sleeve 31, convex edge part 311, conical part 312, first conical surface 3121, outer cone sleeve 32, second opening 321, second conical surface 322, inner cone sleeve 33, third opening 331, third conical surface 332, spring piece 40, connecting hole 41, end cover 50, shaft hole 51, positioning part 52, cover plate part 53, connecting part 54, first limiting step 55, safety rope 60, rotating shaft 70, object to be connected 100. [Specific implementation method]

[0023] The following examples are provided to further explain and supplement the present invention and do not constitute any limitation to the present invention.

[0024] like Figure 1 to Figure 7 As shown, the main points of the quick-release expansion device of the present invention are that an end cover 50 for axial limiting and preventing misoperation is provided on the end of the core rod 10. Only when the end cover 50 is installed in place can the spring sheet 40 be inserted into the end cover 50 to achieve closure; when the end cover 50 is not installed in place, the spring sheet 40 cannot be inserted into the end cover 50; and the end cover 50 is easy and simple to install. Therefore, it is convenient to operate, can be quickly locked, and is also conducive to preventing misoperation. It has strong safety and practicality.

[0025] Specifically, Figure 1 to Figure 3 As shown, the quick-release expansion device of the present invention includes a core rod 10 , a cam handle 20 , an expansion assembly 30 , a spring sheet 40 and an end cover 50 . The cam handle 20 is rotatably connected to one end of the core rod 10, and the end cover 50 can be connected to the other end of the core rod 10; the expansion component 30 is movably sleeved on the core rod 10, and can expand outward and contract inward under the action of the cam handle 20 to hold the core rod 10; one end of the spring sheet 40 is connected to the cam handle 20, and the other end of the spring sheet 40 is provided with a connecting hole 41; when the end cover 50 is not stuck in place and is in a first position state, the end cover 50 can move along the axial direction of the core rod 10 and detach from the core rod 10, and the spring sheet 40 cannot be inserted into the end cover 50 through its connecting hole 41; when the end cover 50 is stuck in place and is in a second position state, the end cover 50 forms an axial limit connection with the end of the core rod 10 and cannot detach from the core rod 10 along the axial direction of the core rod 10, and the spring sheet 40 can be inserted into the end cover 50 through its connecting hole 41.

[0026] To limit the connection with the end cover 50 and prevent misoperation, Figure 3, Figure 4 As shown, a guide groove 111 and a limit groove 112 are provided on the outer wall of the end of the core rod 10. The guide groove 111 is arranged along the axial direction of the core rod 10, and is formed by the end of the core rod 10 extending along the axial direction. The limit groove 112 is arranged along the circumferential direction of the core rod 10, and is connected with the guide groove 111. The specific shapes of the limit groove 112 and the guide groove 111 are not limited, and they are connected with each other to form a corner groove. In this embodiment, the limit groove 112 is perpendicular to the guide groove 111 to form an L-shaped corner groove. In other embodiments, the limit groove 112 is not necessarily perpendicular to the wire groove.

[0027] The number of the limiting grooves 112 and the guiding grooves 111 can be set as required. In this embodiment, two limiting grooves 112 and two guiding grooves 111 are symmetrically arranged on the outer wall of the core rod 10 .

[0028] Correspondingly, such as Figure 3 , Figure 4 , Figure 5 As shown, the end cap 50 is provided with an axial hole 51 which can be inserted into the end of the core rod 10. In order to cooperate with the limiting groove 112 and the guide groove 111, a corresponding positioning portion 52 is provided on the inner wall of the axial hole 51. The positioning portion 52 protrudes from the inner wall of the axial hole 51, can be inserted into the guide groove 111, and can be rotated from the guide groove 111 to the limiting groove 112.

[0029] During installation, if Figure 3 , Figure 4 As shown, the shaft hole 51 corresponds to the end of the core rod 10, the positioning portion 52 corresponds to the limiting groove 112, and then the end cover 50 is inserted into the end of the core rod 10 along the axial direction of the core rod 10, and then the end cover 50 is rotated to make the positioning portion 52 of the end cover 50 slide from the guide groove 111 to the other end of the limiting groove 112, so that the end cover 50 and the core rod 10 form an axial limiting connection, and the end cover 50 cannot move axially relative to the core rod 10 (such as Figure 1 shown).

[0030] When the end cover 50 is inserted into the end of the core rod 10 and the positioning portion 52 thereof is in the guide groove 111 , the end cover 50 is in a snap-in position. At this time, the end cover 50 is in a first position: the end cover 50 can move axially relative to the core rod 10 .

[0031] When the end cover 50 is inserted into the end of the core rod 10 and its positioning portion 52 is in the limiting groove 112 , the end cover 50 is in a locked state, and is now in the second position: the end cover 50 cannot move axially relative to the core rod 10 .

[0032] When the end cover 50 is in the first position, when the cam handle 20 is rotated, the connection hole 41 on the spring sheet 40 cannot always correspond to the end cover 50, so the spring sheet 40 cannot be inserted into the end cover 50 to achieve closure;

[0033] When the end cover 50 is in the second position, when the cam handle 20 is rotated, the connection hole 41 on the spring sheet 40 can correspond to the end cover 50, so that the spring sheet 40 can be inserted into the end cover 50 to achieve closure.

[0034] The shapes of the connecting hole 41 and the end cap 50 can be set as needed, and are not limited to the structures shown in the drawings of this embodiment. For example, the end cap 50 is set to an eccentric structure. When the end cap 50 rotates, the position of its end changes and aligns with or staggers with the connecting hole 41. In this embodiment, Figure 1 , Figure 3 , Figure 4 As shown, the connecting hole 41 is a hexagonal hole, but not a regular hexagon; the end of the end cover 50 is in the shape of a hexagonal nut, but not a regular hexagonal nut; in the first position state, the hexagon of the end cover 50 cannot completely correspond to the hexagon of the connecting hole 41, so the spring piece 40 cannot be inserted into the end cover 50; in the second position state, the hexagon of the end cover 50 completely corresponds to the hexagon of the connecting hole 41, at this time, the spring piece 40 can be inserted into the end cover 50.

[0035] To introduce its structural principle in more detail, in this embodiment, Figure 4 As shown, the end cover 50 includes an integrally formed cover plate portion 53 and a connecting portion 54. The outer dimensions of the cover plate portion 53 are larger than the outer dimensions of the connecting portion 54, and a first limiting step 55 is formed at the joint thereof. The cover plate portion 53 is in the shape of a plate, and is used to axially limit the object 100 to be connected, so as to prevent the object 100 to be connected from escaping from the quick-release expansion device. The connecting portion 54 is used to connect with the spring sheet 40. In this embodiment, the connecting portion 54 is in the shape of a hexagonal nut with a non-regular hexagon.

[0036] like Figure 4 As shown, the shaft hole 51 extends from the end of the cover plate portion 53 along the axial direction and passes through the connecting portion 54. The positioning portion 52 is provided on the inner wall of the shaft hole 51. In this embodiment, it is located on the cover plate portion 53, is flush with the end of the cover plate portion 53, and protrudes from the inner wall of the shaft hole 51.

[0037] like Figure 2 , Figure 3 As shown, in order to prevent the end cap 50 from being lost, a safety rope 60 is connected to the end cap 50. The safety rope 60 is connected to the end cap 50 in a known manner. The other end of the safety rope 60 is connected to the spring 40, so that the end cap 50 will not fall off when it is loosened, thereby preventing it from being lost.

[0038] like Figure 3 , Figure 4 As shown, the core rod 10 includes an integrally formed core rod body 12 and a limiting connection column 11. The core rod body 12 is used to connect with the cam handle 20 and the expansion assembly 30. The limiting connection column 11 is used to connect with the end cover 50. The outer dimension of the limiting connection column 11 is smaller than the outer dimension of the core rod body 12, so a second limiting step 13 is formed at the joint thereof. The second limiting step 13 can be used to abut the cover plate portion 53 of the end cover 50.

[0039] like Figure 3 , Figure 4 As shown, the limiting connection column 11 is cylindrical and coaxial with the core rod body 12. Two guide grooves 111 and two limiting grooves 112 are provided on the outer wall of the limiting connection column 11. In this embodiment, the bottom end of the limiting groove 112 is flush with the second limiting step 13, so that when the end cover 50 is snapped into place and is in the second position state, the cover plate portion 53 of the end cover 50 can abut against the surface of the second limiting step 13.

[0040] like Figure 3 , Figure 4 As shown, in order to facilitate the installation of the cam handle 20 and the expansion assembly 30, the core rod body 12 includes an integrally formed cam connecting portion 121, a cylindrical portion 122 and a frustum portion 123.

[0041] like Figure 3 , Figure 4 As shown, the cam connection part 121 is used to rotatably connect the cam handle 20, and is provided with a shaft hole 1211. The axial direction of the shaft hole 1211 is perpendicular to the axial direction of the core rod body 12. The specific shape of the cam connection part 121 is not limited, and it can be set as needed. In this embodiment, the cam connection part 121 is in the shape of a plate.

[0042] like Figure 3 , Figure 4 As shown, the cylindrical portion 122 is located between the cam connecting portion 121 and the truncated cone portion 123, and is used to movably sleeve the expansion assembly 30. The diameter of the cylindrical portion 122 can be set as required, and should not be larger than the outer size of the end cover 50, that is, the outer size of the cover plate portion 53, so that the end cover 50 can play the role of axial limiting.

[0043] like Figure 3 , Figure 4As shown, the surface of the truncated cone portion 123 is a conical surface, which is conducive to mutual extrusion with the outer cone sleeve 32. The diameter of the end of the truncated cone portion 123 away from the cylindrical portion 122 is larger than the diameter of the cylindrical portion 122, so that the end of the core rod body 12 is bulged. In addition, the diameter of the end of the truncated cone portion 123 away from the cylindrical portion 122 should be smaller than the outer size of the cover plate portion 53, so that the end cover 50 can play the role of axial limiting.

[0044] like Figure 1 , Figure 2 , Figure 3 As shown, the cam handle 20 is rotatably connected to the end of the core rod 10. In this embodiment, it is rotatably connected to the cam connecting portion 121 of the core rod 10 through the rotating shaft 70. The cam handle 20 includes an integrally formed cam portion 21 and an extension portion 22. The cam portion 21 is rotatably connected to the cam connecting portion 121 and can rotate around the rotating shaft 70. The circumferential outer wall of the cam portion 21 is at different distances from the rotating shaft 70. The extension portion 22 is used to connect with the spring sheet 40 to connect with the hanging beam.

[0045] like Figure 1 , Figure 2 , Figure 3 As shown, one end of the spring sheet 40 is connected to the extension portion 22 of the cam handle 20, and a connecting hole 41 is provided on the other end thereof. The end of the spring sheet 40 provided with the connecting hole 41 can be sleeved on the end cover 50 to be closed to achieve the connection of the hanging beam. The material of the spring sheet 40 can be selected as required, such as metal material. The shape of the spring sheet 40 can be set as required. In this embodiment, the spring sheet 40 and the extension portion 22 form a U-shaped structure, which is conducive to the hanging beam. The shape of the connecting hole 41 can be set as required. In this embodiment, it is a hexagonal shape that is not a regular hexagon.

[0046] like Figure 1 , Figure 2 , Figure 3 As shown, the expansion assembly 30 is used for expansion connection by extrusion, and includes an end cone sleeve 31, an outer cone sleeve 32 and an inner cone sleeve 33, which are movably sleeved on the core rod 10 and located between the cam handle 20 and the truncated cone portion 123. The adjacent components of the expansion assembly 30 are matched through conical surfaces. When subjected to extrusion force, the adjacent components are squeezed against each other, so that the inner end cone sleeve 31 and the inner cone sleeve 33 are locked inwardly to hold the core rod 10, while the outer cone sleeve 32 is expanded outwardly to expand the object 100 to be connected, thereby achieving the function of expansion connection.

[0047] like Figure 1 , Figure 2 , Figure 3As shown, the end cone sleeve 31 is movably sleeved on the core rod 10 and is adjacent to the cam handle 20. In this embodiment, the end cone sleeve 31 is movably sleeved on the cylindrical portion 122. The end cone sleeve 31 includes an integrally formed conical portion 312 and a flange portion 311. The flange portion 311 is formed on the end of the conical portion 312, and the flange portion 311 protrudes from the end of the conical portion 312. The flange portion 311 is used for axial limiting, and it faces the cam handle 20. A first conical surface 3121 is provided on the outer wall of the conical portion 312. The first conical surface 3121 is formed by the outer wall of the end of the conical portion 312 tilting outward to the flange portion 311. In other words, since the end cone sleeve 31 is provided with the first conical surface 3121, the wall of the end of the conical portion 312 close to the flange portion 311 is thick, while the wall of the end away from the flange portion 311 is thin.

[0048] like Figure 1 , Figure 2 , Figure 3 As shown, the outer cone sleeve 32 is movably sleeved on the core rod 10. In this embodiment, it is sleeved on the cylindrical portion 122. There are at least two outer cone sleeves 32, and the specific number can be set according to needs. In this embodiment, there are three outer cone sleeves 32.

[0049] like Figure 1 , Figure 2 , Figure 3 As shown in the figure, the outer cone sleeve 32 is provided with a second opening 321 extending in the axial direction and penetrating through both ends thereof; the second opening 321 makes the outer cone sleeve 32 elastic and deformable in the radial direction, and then expand outward. The inner walls at both ends of the outer cone sleeve 32 are respectively provided with a second conical surface 322, and the second conical surface 322 is formed by the inner wall of the end of the outer cone sleeve 32 being inclined inward. In other words, since the second conical surface 322 is provided on the inner wall of the outer cone sleeve 32, the walls of the two ends of the outer cone sleeve 32 are thin, while the wall of the middle part is thick.

[0050] In this embodiment, the inclination angle of the second tapered surface 322 is consistent with the inclination angle of the first tapered surface 3121, so the end tapered sleeve 31 and the outer tapered sleeve 32 can be matched through the first tapered surface 3121 and the second tapered surface 322. When the end tapered sleeve 31 and the outer tapered sleeve 32 are matched, the first tapered surface 3121 of the end tapered sleeve 31 fits with the second tapered surface 322 of the outer tapered sleeve 32, and the end tapered sleeve 31 and the outer tapered sleeve 32 can be squeezed against each other to make the outer tapered sleeve 32 expand outward, and the end tapered sleeve 31 shrinks inward to hold the core rod 10 tightly.

[0051] In addition, the inclination angle of the second conical surface 322 is also consistent with the inclination angle of the conical surface of the truncated cone portion 123, so the outer conical sleeve 32 can be matched with the truncated cone portion 123 through the second conical surface 322. When the outer conical sleeve 32 is matched with the truncated cone portion 123, the second conical surface 322 of the outer conical sleeve 32 fits with the conical surface of the truncated cone portion 123, and the outer conical sleeve 32 squeezes the truncated cone portion 123 to make the outer conical sleeve 32 expand outward.

[0052] like Figure 1 , Figure 2 , Figure 3 As shown, the inner cone sleeve 33 is movably sleeved on the core rod 10. In this embodiment, it is sleeved on the cylindrical portion 122. There is at least one inner cone sleeve 33, which is arranged between two adjacent outer cone sleeves 32. The specific number of the inner cone sleeves 33 can be set as needed. In this embodiment, there are two inner cone sleeves 33.

[0053] like Figure 1 , Figure 2 , Figure 3 As shown, the inner cone sleeve 33 is provided with a third opening 331 extending in the axial direction and penetrating through both ends thereof. The third opening 331 makes the inner cone sleeve 33 elastic and deformable in the radial direction, so as to be tightened inward. The outer walls at both ends of the inner cone sleeve 33 are respectively provided with a third conical surface 332, and the third conical surface 332 is formed by the outer wall of the end of the inner cone sleeve 33 being inclined outward. In other words, since the outer wall of the inner cone sleeve 33 is provided with the third conical surface 332, the inner cone sleeve 33 has thin walls at both ends and thick walls in the middle.

[0054] In this embodiment, the inclination angle of the third tapered surface 332 is consistent with the inclination angle of the second tapered surface 322, so the inner tapered sleeve 33 and the outer tapered sleeve 32 can be matched through the third tapered surface 332 and the second tapered surface 322. When the inner tapered sleeve 33 and the outer tapered sleeve 32 are matched, the third tapered surface 332 of the inner tapered sleeve 33 fits with the second tapered surface 322 of the outer tapered sleeve 32, and the inner tapered sleeve 33 and the outer tapered sleeve 32 can be squeezed against each other to make the outer tapered sleeve 32 expand outward, and the inner tapered sleeve 33 shrinks inward to hold the core pin.

[0055] By this, Figure 1 , Figure 2 , Figure 3As shown, the quick-release expansion shape of the present invention is formed: one end of the core rod 10 is rotatably connected to the cam handle 20, and the other end can be connected to the end cover 50; one end of the spring 40 is connected to the cam handle 20, and the other end is provided with a connecting hole 41 and can be inserted into the end cover 50; the expansion assembly 30 composed of the end cone sleeve 31, the outer cone sleeve 32 and the inner cone sleeve 33 is sleeved on the core rod 10, which is located between the cam handle 20 and the end cover 50, and can shrink inward to hold the core rod 10 tightly, and can expand outward to expand the object to be connected 100; the end cover 50 can be connected to the limiting connection column 11 of the core rod 10; the end cover 50 is provided with a positioning portion 52, and the limiting connection column 11 is provided with a guide groove 111 and a limiting groove 111. 12, so that the end cover 50 can be inserted into the limiting groove 112 along the guide groove 111 to realize the axial limiting connection; when the end cover 50 is not inserted into place, it is in the first position: the positioning portion 52 of the end cover 50 is located in the guide groove 111, and the end cover 50 can move axially relative to the core rod 10. At this time, the spring piece 40 cannot be inserted into the end cover 50 through its connecting hole 41; when the end cover 50 is inserted into place, it is in the second position: the positioning portion 52 of the end cover 50 is located in the limiting groove 112, the end cover 50 and the core rod 10 form an axial limiting connection, the end cover 50 cannot move axially relative to the core rod 10, and the spring piece 40 can be inserted into the end cover 50 through its connecting hole 41.

[0056] The quick-release expansion device of the present invention is used to be inserted into the mounting hole of the object 100 to be connected. When in use, first open the quick-release expansion device so that the spring sheet 40 is not inserted into the end cover 50, and remove the end cover 50 from the core rod 10; then align the core rod 10 with the mounting hole and insert it into the object 100 to be connected (such as Figure 6 As shown), and the end cover 50 is installed on the limiting connecting column 11 of the core rod 10, so that the end cover 50 is installed in place and is in the second position state; then the cam handle 20 is rotated to hang the spring 40 on the end cover 50 to close (as shown in FIG. Figure 7 In this process, the cam handle 20 squeezes the end cone sleeve 31, so that the expansion assembly 30 is squeezed and deformed. At this time, the end cone sleeve 31 and the inner cone sleeve 33 are squeezed and locked inward to hold the core rod 10, and the outer cone sleeve 32 expands outward to form an interference fit with the mounting hole of the object to be connected 100 to expand the object to be connected 100; and the flange portion 311 of the end cone sleeve 31 and the cover plate portion 53 of the end cover 50 further limit the object to be connected 100 in the axial direction to prevent the object to be connected 100 from slipping, thereby achieving an axial locking effect and ensuring the connection safety.

[0057] When disassembly is required, the spring sheet 40 is removed from the end cover 50, and then the end cover 50 is removed and the cam handle 20 is rotated (eg Figure 6 As shown), by loosening the expansion assembly 30, the quick-release expansion device can be pulled out from the mounting hole of the object 100 to be connected.

[0058] The quick-release expansion device of the present invention can only be closed when the end cover 50 is installed in place (such as Figure 1 , Figure 2 , Figure 7 As shown in the figure, when the end cover 50 is not installed in place, the spring sheet 40 cannot be inserted into the end cover 50 for closing, so that the potential safety hazard when the mounting is not in place can be effectively avoided. The quick-release expansion device of the present invention can be locked and connected and disassembled by a simple cam handle 20 operation. It has strong safety, simple operation, strong practicality and novelty, and should be vigorously promoted.

[0059] Although the present invention is disclosed through the above embodiments, the scope of the present invention is not limited thereto, and the above components may be replaced with similar or equivalent elements known to those skilled in the art without departing from the concept of the present invention.

Claims

1. A quick-release expansion device, characterized in that: It includes: A core rod (10) in the shape of a long axis; A cam handle (20) rotatably connected to one end of the core rod (10); An expansion assembly (30) is movably sleeved on the core rod (10) and can be squeezed to expand outwards and shrink inwards to hold the core rod (10); A spring sheet (40), one end of which is connected to the cam handle (20) and the other end of which is provided with a connection hole (41); an end cap (50) which can be connected to an end of the core rod (10) opposite to the cam handle (20); The end cover (50) can be rotated on the core rod (10) and can move from a first position to a second position; When the end cover (50) is in a first position on the core rod (10), the end cover (50) can be moved along the axial direction of the core rod (10) to be separated from the core rod (10), and when the cam handle (20) is rotated, the spring sheet (40) cannot pass through its connecting hole (41) and be inserted into the end cover (50); When the end cover (50) is in a second position on the core rod (10), the end cover (50) forms an axial limit connection with the end of the core rod (10) and cannot be separated from the core rod (10) in the axial direction of the core rod (10), and when the cam handle (20) is rotated, the spring sheet (40) can be inserted into the end cover (50) through its connection hole (41); A guide groove (111) arranged in an axial direction and a limit groove (112) arranged in a circumferential direction are provided on the outer wall of the end of the core rod (10); the guide groove (111) extends in an axial direction from the end of the core rod (10), and the limit groove (112) is connected to the guide groove (111); The end cover (50) is provided with an axial hole (51), and a protruding positioning portion (52) is provided on the inner wall of the axial hole (51); the positioning portion (52) can be inserted into the guide groove (111) and can be rotated from the guide groove (111) to the limiting groove (112); When the positioning portion (52) of the end cover (50) is located in the guide groove (111), the end cover (50) is in a first position state; when the positioning portion (52) of the end cover (50) is located in the limiting groove (112), the end cover (50) is in a second position state; The expansion assembly (30) comprises: An end cone sleeve (31) is movably mounted on the core rod (10) and is deformable in the radial direction; The end cone sleeve (31) is adjacent to the cam handle (20); an outer cone sleeve (32) which is movably mounted on the core rod (10) and can be deformed in the radial direction; the outer cone sleeve (32) is located between the end cone sleeve (31) and an end portion of the core rod (10) for connecting to the end cover (50); the outer cone sleeve (32) and the end cone sleeve (31) are matched via conical surfaces at the end portions; An inner conical sleeve (33) is movably mounted on the core rod (10) and is deformable in the radial direction; the inner conical sleeve (33) is located between two adjacent outer conical sleeves (32) and is matched with the outer conical sleeves (32) through the conical surface at the end thereof; When the cam handle (20) rotates around the core rod (10) and squeezes the end cone sleeve (31), the end cone sleeve (31), the outer cone sleeve (32), and the inner cone sleeve (33) squeeze each other, causing the end cone sleeve (31) and the inner cone sleeve (33) to shrink inwards and hold the core rod (10), and causing the outer cone sleeve (32) to expand outwards.

2. The quick-release expansion device according to claim 1, characterized in that: The end cover (50) comprises an integrally formed cover plate portion (53) and a connecting portion (54); the outer dimensions of the cover plate portion (53) are larger than the outer dimensions of the connecting portion (54); and a first limiting step (55) is formed at the junction thereof; The shaft hole (51) extends axially from the end of the cover plate portion (53) and penetrates into the connecting portion (54).

3. The quick-release expansion device according to claim 1, characterized in that: The core rod (10) comprises an integrally formed core rod body (12) and a position limiting connection column (11), wherein a second position limiting step (13) is formed at the junction of the position limiting connection column (11) and the core rod body (12); The guide groove (111) and the limiting groove (112) are provided on the limiting connection column (11); The expansion assembly (30) is sleeved on the core rod body (12).

4. The quick-release expansion device according to claim 3, characterized in that: The core rod body (12) comprises an integrally formed cam connection portion (121), a cylindrical portion (122) and a truncated cone portion (123); the cylindrical portion (122) is located between the cam connection portion (121) and the truncated cone portion (123); The cam connecting portion (121) is rotatably connected to the cam handle (20); The expansion assembly (30) is movably sleeved on the cylindrical portion (122); The diameter of an end portion of the truncated cone portion (123) away from the cylindrical portion (122) is greater than the diameter of the cylindrical portion (122); The limiting connection column (11) is formed vertically on the end surface of the truncated cone portion (123) and is coaxial with the truncated cone portion (123).

5. The quick-release expansion device according to claim 1, characterized in that: The end cover (50) is connected to the spring sheet (40) via a safety rope (60).

6. The quick-release expansion device according to claim 1, characterized in that: The end cone sleeve (31) comprises a cone portion (312) and a flange portion (313) integrally formed on the end of the cone portion (312), wherein the flange portion (313) protrudes from the end of the cone portion (312) and faces the cam handle (20); A first conical surface (3121) is provided on the outer wall of the conical portion (312), and the first conical surface (3121) is formed by the outer wall of the end of the conical portion (312) being inclined outwards to the convex edge portion (313).

7. The quick-release expansion device according to claim 1, characterized in that: The outer cone sleeve (32) is provided with a second opening (321) extending in the axial direction and penetrating through both ends thereof, and second conical surfaces (322) are respectively provided on the inner walls at both ends of the outer cone sleeve (32), and the second conical surfaces (322) are formed by the inner walls of the end portions of the outer cone sleeve (32) being inclined inwardly.

8. The quick-release expansion device according to claim 1, characterized in that: The inner tapered sleeve (33) is provided with a third opening (331) extending in the axial direction and penetrating through both ends thereof, and third tapered surfaces (332) are respectively provided on the outer walls at both ends of the inner tapered sleeve (33), and the third tapered surfaces (332) are formed by the outer walls of the end portions of the inner tapered sleeve (33) being inclined outwards.

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