A fastening screw that is not easy to loosen

Abstract

The invention discloses a fastening screw which is not easy to loosen, comprising: a large screw rod, a small screw rod and a workpiece; the large screw rod is provided with a through hole for the small screw rod to pass through, the workpiece is provided with a large internal threaded hole and a small internal threaded hole in a stage shape, the external threads of the large screw rod and the small screw rod have opposite rotation directions or the same rotation directions and different pitches; the tail end of the large screw rod is assembled in the large internal threaded hole, and the tail end of the small screw rod is assembled in the small internal threaded hole after passing through the through hole; a sleeve cap matched with the head end is sleeved on the head end of the large screw rod, and a plurality of ejector pins are arranged on the sleeve cap; a driving plate with a center hole is provided on the sleeve cap, and a plurality of toggle columns at the bottom of the driving plate are correspondingly arranged in the toggle hole of each ejector pin; a rotating part is installed below the head end of the small screw rod, and a plurality of ejector grooves are arranged on the rotating part; the rotating part is arranged in the middle part of the ejector pin and the ejector pin is correspondingly stuck in the ejector groove, so that the small screw rod can rotate in the tightening direction but cannot rotate in the loosening direction, so as to realize the locking of the large screw rod, the small screw rod and the workpiece.

Description

Technical Field

[0001] The invention relates to the technical field of screws, and in particular to a fastening screw that is not easy to loosen. Background Art

[0002] Screws consist of a screw rod and a nut (nut), which are parts that are screwed together to perform a tightening function. They are a commonly used component in all manufacturing machinery.

[0003] The existing commonly used screws are one-way threaded screws used in conjunction with nuts, which can easily cause the connection to loosen under external environments such as vibration.

[0004] At the same time, the existing screws also include some commonly used self-locking screws. The anti-loosening nut is composed of two parts, each of which has a staggered cam. Since the internal wedge-shaped design slope angle is greater than the nut angle of the bolt, this combination is tightly bitten into a whole. When vibration occurs, the protruding parts of the loose nut shift against each other, generating lifting tension, thereby achieving an anti-loosening effect. However, the existing self-locking screws cannot prevent the nut from loosening when the vibration is large or long-term, and frequent inspections are labor-intensive and time-consuming, consuming human, material and financial resources. Summary of the invention

[0005] In view of the above problems existing in the prior art, the present invention provides a fastening screw which is not easy to loosen and can be achieved within its working life.

[0006] The first object of the present invention is to provide a fastening screw that is not easy to loosen, comprising: a large screw rod, a small screw rod and a workpiece;

[0007] The large screw is provided with a through hole for the small screw to pass through, the workpiece is provided with a large internal threaded hole and a small internal threaded hole in a stage shape, the external threads of the large screw and the small screw have opposite rotation directions or the same rotation directions and different pitches; the tail end of the large screw is assembled in the large internal threaded hole, and the tail end of the small screw is assembled in the small internal threaded hole after passing through the through hole;

[0008] The head end of the large screw is covered with a cap matched with the head end, and a plurality of ejector pins are arranged on the cap; a driving plate with a central hole is provided on the cap, and a plurality of toggle posts at the bottom of the driving plate are correspondingly placed in the toggle holes of each ejector pin; a rotating member is installed below the head end of the small screw, and a plurality of top grooves are arranged on the rotating member;

[0009] The rotating member is placed in the middle of the ejector pin and the ejector pin is correspondingly stuck in the ejector groove, so that the small screw can rotate in the tightening direction but cannot rotate in the loosening direction, thereby locking the large screw, the small screw and the workpiece.

[0010] As a further improvement of the present invention, the large screw, the small screw, the workpiece, the sleeve cap, the drive plate and the rotating member are coaxially arranged;

[0011] The lower surface of the rotating member is pressed against the head end of the large screw, and the upper surface is higher than the upper surface of the driving plate;

[0012] The rotating member and the small screw are an integrated structure, or a coaxial prism mounting platform is provided below the head end of the small screw, and the center hole of the rotating member is fitted on the prism mounting platform; the rotation of the small screw can drive the rotating member to rotate.

[0013] As a further improvement of the present invention, the opening angle of the top groove is an acute angle, a right angle, or an obtuse angle that can prevent the ejector pin from slipping;

[0014] When the opening angle of the top groove is an acute angle, the method for removing the fastening screw is as follows: rotating the small screw by a preset angle in the tightening direction until the ejector pin is in a condition to be separated from the top groove; then, rotating the driving plate, and the toggle column drives the ejector pin to be separated from the top groove of the rotating member; finally, rotating and removing the small screw and the large screw in the loosening direction in turn;

[0015] When the opening angle of the top groove is a right angle or an obtuse angle that can prevent the ejector pin from slipping, the method for removing the fastening screw is: rotating the drive plate, and the toggle column drives the ejector pin to disengage from the top groove of the rotating part; then, rotating and removing the small screw and the large screw in the loosening direction in turn.

[0016] The second object of the present invention is to provide a fastening screw that is not easy to loosen, comprising: a large screw rod, a small screw rod and a nut;

[0017] The large screw is provided with a small internal threaded hole matched with the small screw, the nut has a large internal threaded hole matched with the large screw, the nut is provided with a gasket with a small center hole, the external threads of the large screw and the small screw have opposite rotation directions or the same rotation directions and different pitches; the tail end of the large screw is assembled in the large internal threaded hole, and the tail end of the small screw passes through the gasket and is relatively assembled in the small internal threaded hole;

[0018] The nut is covered with a cap that matches the nut, and a plurality of ejector pins are arranged on the cap; a driving plate with a central hole is provided on the cap, and a plurality of toggle posts at the bottom of the driving plate are correspondingly placed in the toggle holes of each ejector pin; a rotating member is installed below the head end of the small screw, and a plurality of top grooves are arranged on the rotating member;

[0019] The rotating member is placed in the middle of the ejector pin and the ejector pin is correspondingly stuck in the ejector groove, so that the small screw can rotate in the tightening direction but cannot rotate in the loosening direction, thereby locking the large screw, small screw and nut.

[0020] As a further improvement of the present invention, the large screw, small screw, nut, sleeve cap, drive plate and rotating member are coaxially arranged;

[0021] The lower surface of the rotating member is pressed on the gasket, and the upper surface is higher than the upper surface of the driving plate;

[0022] The rotating member and the small screw are an integrated structure, or a coaxial prism mounting platform is provided below the head end of the small screw, and the center hole of the rotating member is fitted on the prism mounting platform; the rotation of the small screw can drive the rotating member to rotate.

[0023] As a further improvement of the present invention, the opening angle of the top groove is an acute angle, a right angle, or an obtuse angle that can prevent the ejector pin from slipping;

[0024] When the opening angle of the top groove is an acute angle, the method for removing the fastening screw is as follows: rotating the small screw by a preset angle in the tightening direction until the ejector pin is in a condition to be separated from the top groove; then, rotating the driving plate, and the toggle column drives the ejector pin to be separated from the top groove of the rotating member; finally, rotating and removing the small screw and the large screw in the loosening direction in turn;

[0025] When the opening angle of the top groove is a right angle or an obtuse angle that can prevent the ejector pin from slipping, the method for removing the fastening screw is: rotating the drive plate, and the toggle column drives the ejector pin to disengage from the top groove of the rotating part; then, rotating and removing the small screw and the large screw in the loosening direction in turn.

[0026] The third object of the present invention is to provide a fastening screw that is not easy to loosen, comprising: a large screw rod, a small screw rod and a workpiece;

[0027] The large screw is provided with a through hole for the small screw to pass through, the workpiece is provided with a large internal threaded hole and a small internal threaded hole in a stage shape, the external threads of the large screw and the small screw have opposite rotation directions or the same rotation directions and different pitches; the tail end of the large screw is assembled in the large internal threaded hole, and the tail end of the small screw is assembled in the small internal threaded hole after passing through the through hole;

[0028] The head end of the large screw is provided with a groove for accommodating the head end of the small screw, and the axial direction of the groove is provided with a slot for accommodating a spring sheet; when the spring sheet is inserted into the slot, the large screw, the small screw and the workpiece are locked; or, the head end of the large screw is provided with a groove for accommodating the head end of the small screw, and the axial direction of the groove is provided with a slot for accommodating the spring sheet, and the spring sheet is provided with a clamping head for clamping into the head end of the small screw; when the spring sheet is inserted into the slot, the clamping head of the spring sheet is clamped into the hole of the head end of the small screw, thereby locking the large screw, the small screw and the workpiece.

[0029] As a further improvement of the present invention, the head end of the small screw is a hexagonal hole or a cross hole, and the clamping head of the spring piece is a matching polygonal clamping head or a straight clamping head.

[0030] The fourth object of the present invention is to provide a fastening screw that is not easy to loosen, comprising: a large screw rod, a small screw rod and a nut;

[0031] The large screw is provided with a small internal threaded hole matched with the small screw, a gasket with a small center hole is provided in the middle of the nut, and a large internal threaded hole matched with the large screw is provided in the nut on one side of the gasket, and the external threads of the large screw and the small screw have opposite rotation directions or the same rotation directions and different pitches; the tail end of the large screw is assembled in the large internal threaded hole, and the tail end of the small screw passes through the gasket and is relatively assembled in the small internal threaded hole;

[0032] The nut on the other side of the gasket is provided with a groove for accommodating the head end of the small screw, and the groove is axially provided with a slot for accommodating a spring sheet; when the spring sheet is inserted into the slot, the large screw, the small screw and the workpiece are locked; or, the nut on the other side of the gasket is provided with a groove for accommodating the head end of the small screw, and the groove is axially provided with a slot for accommodating the spring sheet, and the spring sheet is provided with a clamping head for clamping into the head end of the small screw; when the spring sheet is inserted into the slot, the clamping head of the spring sheet is clamped into the hole of the head end of the small screw, thereby locking the large screw, the small screw and the workpiece.

[0033] As a further improvement of the present invention, the head end of the small screw is a hexagonal hole or a cross hole, and the clamping head of the spring piece is a matching polygonal clamping head or a straight clamping head.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] The invention realizes self-locking during assembly by having the large screw and the small screw with external threads in opposite directions;

[0036] The present invention uses a locking mechanism composed of a sleeve cap, a driving plate and a rotating member, the locking mechanism presses the small screw, and the small screw presses the large screw; and the top pin of the sleeve cap is correspondingly stuck in the top groove of the rotating member, so that the small screw can only rotate in the tightening direction and cannot rotate in the loosening direction, thereby completing the locking of the large screw, the small screw and the workpiece, and achieving the goal of not being easy to loosen;

[0037] The present invention realizes locking of the driving plate by selecting a top groove with an acute opening angle; that is, only by rotating the small screw rod by a preset angle in the tightening direction until the ejector pin has the condition to be separated from the top groove; then, by rotating the driving plate, the toggle column can drive the ejector pin to be separated from the top groove of the rotating member, thereby realizing disassembly, which is more suitable for occasions with higher locking requirements;

[0038] The present invention locks the large screw, the small screw and the workpiece by pressing the small screw with the spring piece and the large screw with the small screw, so as to prevent them from loosening easily. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a schematic diagram of the structure of the fastening screw disclosed in Embodiment 1 of the present invention;

[0040] Figure 2 This is a schematic diagram of the structure in which the workpiece, the cap and the driving plate are omitted in Embodiment 1 of the present invention;

[0041] Figure 3 This is a schematic diagram of the structure of the large screw in Example 1 of the present invention;

[0042] Figure 4 This is a schematic diagram of the assembly of the small screw and the rotating member in Example 1 of the present invention;

[0043] Figure 5 It is a schematic diagram of the structure of a workpiece in Example 1 of the present invention;

[0044] Figure 6 Schematic diagram of the structure of the cap in Example 1 of the present invention; wherein a is a front view and b is a back view;

[0045] Figure 7 Schematic diagram of the structure of the driving plate in Example 1 of the present invention; wherein a is a front view and b is a back view;

[0046] Figure 8 Schematic diagram of the structure of the rotating member in Embodiment 1 of the present invention;

[0047] Fig. 9 This is a schematic diagram of the assembly of the large screw, the workpiece and the sleeve cap in Example 1 of the present invention;

[0048] Fig.10 This is a schematic diagram of the assembly of the large screw, the workpiece, the sleeve cap, the drive plate and the rotating member in Example 1 of the present invention;

[0049] Fig.11 This is a rear view of the assembly of the sleeve cap, the driving plate and the rotating member in Example 1 of the present invention;

[0050] Fig.12 Schematic diagram of the structure of the rotating member in Embodiment 2 of the present invention;

[0051] Fig.13 This is a schematic diagram of the assembly of the large screw, workpiece, sleeve cap and rotating member in Example 2 of the present invention;

[0052] Fig.14 This is a schematic diagram of the structure of a fastening screw according to Embodiment 3 of the present invention;

[0053] Fig.15 This is a schematic diagram of the assembly of the large screw, nut and gasket in Example 3 of the present invention;

[0054] Fig.16 This is a schematic diagram of the structure in which the cap and the driving plate are omitted in Embodiment 3 of the present invention;

[0055] Fig.17 This is a schematic diagram of the structure of the fastening screw disclosed in Example 5 of the present invention;

[0056] Fig.18 It is a schematic structural diagram of a fastening screw cut along the slot in Embodiment 5 of the present invention;

[0057] Fig.19 Schematic diagram of the structure of the spring piece in Embodiment 5 of the present invention; wherein a is a front view and b is a back view;

[0058] Fig. 20 This is a schematic diagram of the structure of the fastening screw disclosed in Example 6 of the present invention;

[0059] Fig.21 Schematic diagram of the structure of the spring piece in Embodiment 6 of the present invention; wherein a is a front view and b is a back view;

[0060] Fig. 22 This is a schematic diagram of the structure of the fastening screw disclosed in Example 7 of the present invention;

[0061] Fig.23 This is a schematic diagram of the structure of the fastening screw disclosed in Example 8 of the present invention.

[0062] In the figure:

[0063] 10. Large screw; 11. Through hole;

[0064] 20. Small screw;

[0065] 30. Workpiece; 31. Large internal threaded hole; 32. Small internal threaded hole; 33. Slot;

[0066] 40. Nut; 41. Washer;

[0067] 50. Cap; 51. Ejector pin; 52. Switch hole;

[0068] 60. driving plate; 61. toggle column;

[0069] 70. Rotating member; 71. Top groove;

[0070] 80. Shrapnel; 81. Clip. DETAILED DESCRIPTION

[0071] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0072] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0073] Example 1

[0074] like Figures 1 to 11 As shown, the present invention provides a fastening screw that is not easy to loosen, comprising: a coaxially arranged large screw 10, a small screw 20, a workpiece 30, a sleeve cap 50, a drive plate 60 and a rotating member 70; wherein the large screw 10 and the small screw 20 of embodiment 1 are installed in the same direction, and the rotating member 70 adopts a top groove 71 with an acute opening angle;

[0075] Specifically:

[0076] like Figure 3 As shown, the large screw 10 of the present invention is provided with a through hole 11 for the small screw 20 to pass through, and the through hole 11 can be a threaded hole or an ordinary smooth through hole. The external threads of the large screw 10 and the small screw 20 have opposite rotation directions or the same rotation directions and different pitches; the workpiece 30 of the present invention is provided with a large internal threaded hole 31 and a small internal threaded hole 32 in a staged shape, and the threads of the large internal threaded hole 31 and the small internal threaded hole 32 have opposite rotation directions or the same rotation directions and different pitches, such as Figure 5 As shown; based on this, during installation, the tail end of the large screw 10 is assembled in the large internal threaded hole 31, and the tail end of the small screw 20 passes through the through hole 11 of the large screw 10 and is assembled in the small internal threaded hole 32, thereby realizing the connection between the large screw 10, the small screw 20, and the workpiece or the double-hole nut 30, which is used to fix the parts to be assembled. Further, the workpiece 30 of the present invention can be a nut structure, or it can be obtained by drilling holes on an existing workpiece (flange, etc.) to obtain the corresponding large internal threaded hole 31 and small internal threaded hole 32.

[0077] The head end of the large screw 10 of the present invention is covered with a cap 50 that matches the head end, and a plurality of movable ejector pins 51 are arranged around the cap 50, and each ejector pin 51 has an activation hole 52; specifically, as Figure 6 As shown in a and b, the bottom of the sleeve cap 50 is provided with an inner hexagonal hole, which is fitted on the hexagonal head end of the large screw 10 to realize the assembly of the sleeve cap 50 and the large screw 10; 6 movable ejector pins 51 are arranged on the top of the inner circle side wall of the sleeve cap 50, and the 6 movable ejector pins 51 are attached to the head end of the large screw 10, and the middle of the 6 movable ejector pins 51 forms a middle space for assembling the rotating member 70, as shown in FIG. Fig. 9 As shown; the present invention is provided with a driving plate 60 with a center hole at the top of the sleeve cap 50, the center hole for the rotating member 70 to pass through, and the diameter of the center hole is smaller than the head end of the small screw 20; as Figure 7 As shown in a and b, the six toggle posts 61 at the bottom of the driving plate 60 of the present invention are correspondingly placed in the toggle holes 52 of each ejector pin 51, so as to realize the assembly of the driving plate 60 and the sleeve cap 50, as shown in FIG. Fig.10 As shown. Figure 2 , 4 As shown in Figures 8 and 9, a rotating member 70 is installed below the head end of the small screw 20 of the present invention, and a plurality of top grooves 71 are arranged on the rotating member 70, and the opening angle of the top groove 71 is an acute angle; wherein, the lower surface of the rotating member 70 of the present invention is pressed on the head end of the large screw 10, and the upper surface is higher than the upper surface of the driving plate 60, so that a gap is left between the lower surface of the head end of the small screw 20 and the upper surface of the driving plate 60, so that the pressing of the small screw 20 does not affect the rotation of the driving plate 60; at the same time, the present invention may provide an elastic pad or a flexible pad in the gap to prevent external dust from entering the structure of the rotating member 70, and may further prevent vibration; further, the rotating member 70 and the small screw 20 are an integrated structure, or the small screw 20 is provided with a coaxial prism mounting platform below the head end, and the hexagonal hole of the rotating member 70 is fitted on the prism mounting platform, so that the rotation of the small screw 20 can drive the rotating member 70 to rotate.

[0078] like Fig.11 As shown, the rotating member 70 of the present invention is placed in the middle of the ejector pin 51 and the ejector pin 51 is correspondingly stuck in the top groove 71, so that the small screw 20 can rotate in the tightening direction but cannot rotate in the loosening direction, thereby locking the large screw, the small screw and the workpiece; that is, in Fig.11 In the attached drawings, the small screw 20 can only drive the rotating member 70 to be tightened clockwise, but cannot be loosened counterclockwise. Based on the above structure, the fastening screw of the present invention can only be tightened after installation, thereby achieving the goal of being difficult to loosen.

[0079] The installation method of the fastening screw of the present invention is:

[0080] Step 1: For the part to be fixed, after the large screw 10 passes through the through hole of the part from one side to the other side, the tail end of the large screw 10 is installed in the large internal threaded hole 31 of the workpiece 30; wherein the head end of the large screw 10 and the workpiece 30 are respectively arranged on both sides of the part to be fixed;

[0081] Step 2: Cover the cap 50 on the head end of the large screw 10 or connect the cap 50 and the head end of the large screw 10 as one or stop the cap 50 and the head end of the large screw 10 by matching the groove and the protrusion, cover the drive plate 60 on the cap 50, and insert the toggle post 61 of the drive plate 60 into the toggle hole 52 of the ejector pin 51 to realize the assembly of the cap 50, the drive plate 60 and the large screw 10;

[0082] Step 3, connect the rotating member 70 to the small screw 20, and then insert it into the central hole of the driving plate 60 from one side to the other side, so that the rotating member 70 is placed on the head end of the large screw 10 and located in the middle area surrounded by the ejector pins 51, and the small screw 20 is inserted into the central through hole 11 of the large screw 10;

[0083] Step 4, rotating the small screw 20 in the tightening direction, so that the small screw 20 is screwed into the small internal thread 32 of the workpiece 30; at this time, during the tightening rotation, the ejector pin 51 does not affect the rotation of the rotating member 70;

[0084] Step 5: After the small screw 20 is rotated and tightened to be installed in place, the ejector pin 51 is stuck in the slot 71 of the rotating member 70, so that the rotating member 70 cannot be loosened; thereby achieving the goal of never loosening the fastening screw after installation.

[0085] The disassembly method of the fastening screw of the present invention is as follows:

[0086] Since the opening angle of the top groove 71 is an acute angle, the ejector pin 51 has no space to move and open, so the driving plate 60 cannot be directly rotated to make the ejector pin 51 escape from the top groove 71. Therefore, when disassembling the present invention, the small screw 20 needs to be rotated in the tightening direction by a preset angle until the ejector pin 51 has the conditions to escape from the top groove 71, for example, Figure 2 In the structure shown, the hexagonal head end of the small screw 20 is rotated to a position parallel to the sides of the hexagonal head end of the drive plate 60; then, the drive plate 60 is rotated, and the lever 61 is driven to drive the ejector pin 51 to disengage from the top groove 71 of the rotating member 70; finally, the small screw 20 and the large screw 10 are rotated and disassembled in the loosening direction in turn; and the disassembly is completed.

[0087] Example 2

[0088] like Fig.12 , 13As shown, the present invention provides a fastening screw that is not easy to loosen. The difference between the present invention and the embodiment 1 is that the opening angle of the top groove 71 is a right angle or an obtuse angle that can prevent the ejector pin from slipping.

[0089] The present invention provides a method for installing a fastening screw, which is consistent with embodiment 1;

[0090] The present invention provides a method for disassembling a fastening screw. Since the opening angle of the top groove 71 is a right angle or an obtuse angle that can prevent the ejector pin from slipping, the ejector pin 51 has a toggle opening space, so the drive plate 60 can be directly rotated to disengage the ejector pin 51 from the top groove 71; the subsequent disassembly method is consistent with Example 1.

[0091] Example 3

[0092] like Figures 14 to 16 As shown, the present invention provides a fastening screw that is not easy to loosen, comprising: a coaxially arranged large screw 10, a small screw 20, a nut 40, a sleeve cap 50, a drive plate 60 and a rotating member 70; wherein the large screw 10 and the small screw 20 of embodiment 3 are relatively installed, and the rotating member 70 adopts a top groove 71 with an acute opening angle;

[0093] The difference from the first embodiment is that the present embodiment has a small internal threaded hole 32 on the large screw 10 that matches the small screw 20, and the small internal threaded hole 32 can be a through hole or a blind hole; the nut 40 has a large internal threaded hole 31 that matches the large screw 10, and the nut 40 is provided with a gasket 41 with a small center hole, and the gasket 41 and the nut 40 can be a separate structure or an integrated structure, and the gasket 41 provides a mounting platform for the rotating member 70, and the small screw 20 can pass through the small center hole of the gasket 41. The structures of the cap 50, the driving plate 60 and the rotating member 70 are sequentially sleeved on the nut 40 in this embodiment, which are consistent with the first embodiment, so they are not elaborated here.

[0094] The installation method of the fastening screw of the present invention is:

[0095] Step 1: For the part to be fixed, after the large screw 10 passes through the through hole of the part from the lower side to the upper side of the part, the tail end of the large screw 10 is installed in the large internal threaded hole 31 of the nut 40; wherein the head end of the large screw 10 and the nut 40 are respectively arranged on both sides of the part to be fixed;

[0096] Step 2: A gasket 41 is provided on the upper side of the nut 40, and then the cap 50 is put on the nut 40, the driving plate 60 is covered on the cap 50, and the toggle post 61 of the driving plate 60 is inserted into the toggle hole 52 of the ejector pin 51, so as to realize the assembly of the cap 50, the driving plate 60 and the nut 40;

[0097] Step 3, connect the rotating member 70 to the small screw 20, and then insert it into the center hole of the driving plate 60 from the upper side to the lower side, so that the rotating member 70 is placed on the gasket 41 of the nut 40 and located in the middle area surrounded by the ejector pin 51, and the small screw 20 is inserted into the small internal threaded hole 32 of the large screw 10;

[0098] Step 4, rotating the small screw 20 in the tightening direction, so that the small screw 20 is screwed into the small internal thread 32 of the large screw 10; at this time, during the tightening rotation, the ejector pin 51 does not affect the rotation of the rotating member 70;

[0099] Step 5: After the small screw 20 is rotated and tightened to be installed in place, the ejector pin 51 is stuck in the slot 71 of the rotating member 70, so that the rotating member 70 cannot be loosened; thereby achieving the goal of never loosening the fastening screw after installation.

[0100] The disassembly method of the fastening screw of the present invention is as follows:

[0101] Since the opening angle of the top groove 71 is an acute angle, the ejector pin 51 has no space to move and open, so the driving plate 60 cannot be directly rotated to make the ejector pin 51 escape from the top groove 71. Therefore, when disassembling the present invention, the small screw 20 needs to be rotated in the tightening direction by a preset angle until the ejector pin 51 has the conditions to escape from the top groove 71, for example, Fig.14 In the structure shown, the hexagonal head end of the small screw 20 is rotated to a position parallel to the sides of the hexagonal head end of the drive plate 60; then, the drive plate 60 is rotated, and the lever 61 is driven to drive the ejector pin 51 to disengage from the top groove 71 of the rotating member 70; finally, the small screw 20 and the large screw 10 are rotated and disassembled in the loosening direction in turn; and the disassembly is completed.

[0102] Example 4

[0103] The present invention provides a fastening screw that is not easy to loosen. The difference between the fastening screw and the embodiment 3 is that the opening angle of the top groove 71 is a right angle or an obtuse angle that can prevent the ejector pin from slipping.

[0104] The present invention provides a method for installing a fastening screw, which is consistent with Example 3.

[0105] The present invention provides a method for disassembling a fastening screw. Since the opening angle of the top groove 71 is a right angle or an obtuse angle that can prevent the ejector pin from slipping, the ejector pin 51 has a space for being opened by being moved, so the drive plate 60 can be directly rotated to disengage the ejector pin 51 from the top groove 71. The subsequent disassembly method is consistent with that of Example 3.

[0106] Example 5

[0107] like Figures 17 to 19As shown, the present invention provides a fastening screw that is not easy to loosen, comprising: a coaxially arranged large screw 10, a small screw 20, a workpiece 30 and a spring 80; wherein the large screw 10 and the small screw 20 of embodiment 5 are installed in the same direction, the head end of the small screw 20 is a hexagonal hole, and the clamping head 81 of the spring 80 is a matching polygonal clamping head;

[0108] Specifically:

[0109] like Figure 3 As shown, the large screw 10 of the present invention is provided with a through hole 11 for the small screw 20 to pass through, and the through hole 11 can be a threaded hole or an ordinary smooth through hole. The external threads of the large screw 10 and the small screw 20 have opposite rotation directions or the same rotation directions and different pitches; the workpiece 30 of the present invention is provided with a large internal threaded hole 31 and a small internal threaded hole 32 in a staged shape, and the threads of the large internal threaded hole 31 and the small internal threaded hole 32 have opposite rotation directions or the same rotation directions and different pitches, such as Figure 5 As shown; based on this, during installation, the tail end of the large screw 10 is assembled in the large internal threaded hole 31, and the tail end of the small screw 20 passes through the through hole 11 of the large screw 10 and is assembled in the small internal threaded hole 32, thereby realizing the connection between the large screw 10, the small screw 20, and the workpiece 30, which is used to fix the parts to be assembled. Further, the workpiece 30 of the present invention can be a nut structure, or it can be obtained by drilling holes on an existing workpiece (flange, etc.) to obtain the corresponding large internal threaded hole 31 and small internal threaded hole 32.

[0110] The head end of the large screw 10 of the present invention is provided with a groove for accommodating the head end of the small screw 20, and the axial direction of the groove is provided with a slot 33 for accommodating a spring piece 80, and the spring piece 80 is provided with a clamping head 81 for clamping into the head end of the small screw; when the spring piece 80 is clamped into the slot 33, the clamping head 81 of the spring piece 80 is clamped into the hexagonal head end hole of the small screw, thereby realizing the locking of the large screw 10, the small screw 20 and the workpiece 30.

[0111] The installation method of the fastening screw of the present invention is:

[0112] Step 1: For the part to be fixed, after the large screw 10 passes through the through hole of the part from the lower side to the upper side of the part, the tail end of the large screw 10 is installed in the large internal threaded hole 31 of the workpiece 30; wherein the head end of the large screw 10 and the workpiece 30 are respectively arranged on both sides of the part to be fixed;

[0113] Step 2: The small screw 20 passes through the head end groove and the through hole 11 of the large screw 10 in sequence, and then is screwed into the small internal threaded hole 32 of the workpiece 30;

[0114] Step 3: After the small screw 20 is assembled, the spring piece 80 is inserted into the slot 33 at the head end of the large screw 10, and the head 81 of the spring piece 80 is inserted into the hexagonal head end hole of the small screw to tighten the head end of the small screw 20 and ensure that the fastening screw will never loosen after installation.

[0115] Further, the present invention can omit Fig.19 The clamping head 81 presses the small screw 20 only through the spring piece 80 and the matching clamping groove 33 .

[0116] The disassembly method of the fastening screw of the present invention is as follows:

[0117] The spring piece 80 is removed to release the pressing force of the spring piece 80 on the head end of the small screw rod 20 , and the small screw rod 20 and the large screw rod 10 are disassembled by rotating them in the loosening direction in sequence; and the disassembly is completed.

[0118] Example 6

[0119] like Figures 20-21 As shown, the present invention provides a fastening screw that is not easy to loosen. The difference between the present invention and the embodiment 5 is that the head end of the small screw rod 20 is an inner cross hole, and the clamping head 81 of the spring piece 80 is a matching straight clamping head.

[0120] The present invention provides a method for installing a fastening screw, which is consistent with Example 5.

[0121] The present invention provides a method for disassembling a fastening screw, which is consistent with Example 5.

[0122] Example 7

[0123] like Fig. 22 As shown, the present invention provides a fastening screw that is not easy to loosen, comprising: a coaxially arranged large screw 10, a small screw 20, a nut 40 and a spring 80; wherein the large screw 10 and the small screw 20 of embodiment 5 are relatively installed, the head end of the small screw 20 is a hexagonal hole, and the clamping head 81 of the spring 80 is a matching polygonal clamping head;

[0124] The difference from Example 5 is that, in this embodiment, a small internal threaded hole 32 cooperating with the small screw 20 is provided on the large screw 10, and the small internal threaded hole 32 can be a through hole or a blind hole; the nut 40 has a large internal threaded hole 31 cooperating with the large screw 10; the nut 40 is provided with a groove for accommodating the head end of the small screw 20, and the axial direction of the groove is provided with a slot 33 for accommodating the spring piece 80, and the spring piece 80 is provided with a clamping head 81 for clamping into the head end of the small screw; when the spring piece 80 is clamped into the slot 33, the clamping head 81 of the spring piece 80 is clamped into the hexagonal head end hole of the small screw, thereby realizing the locking of the large screw 10, the small screw 20 and the nut 40.

[0125] The installation method of the fastening screw of the present invention is:

[0126] Step 1: For the part to be fixed, after the large screw 10 passes through the through hole of the part from the lower side to the upper side of the part, the tail end of the large screw 10 is installed in the large internal threaded hole 31 of the nut 40; wherein the head end of the large screw 10 and the nut 40 are respectively arranged on both sides of the part to be fixed;

[0127] Step 2, the small screw 20 is passed through the head end groove of the nut 40 and the small internal thread hole 32 of the large screw 10 in sequence, and then screwed into the small internal thread hole 32 of the large screw 10;

[0128] Step 3: After the small screw 20 is assembled, insert the spring piece 80 into the slot 33 of the nut, and insert the head 81 of the spring piece 80 into the hexagonal head end hole of the small screw to tighten the head end of the small screw 20 and ensure that the fastening screw will never loosen after installation.

[0129] Further, the present invention can omit Fig.21 The clamping head 81 presses the small screw 20 only through the spring piece 80 and the matching clamping groove 33 .

[0130] The disassembly method of the fastening screw of the present invention is as follows:

[0131] The spring piece 80 is removed to release the pressing force of the spring piece 80 on the head end of the small screw rod 20 , and the small screw rod 20 and the large screw rod 10 are disassembled by rotating them in the loosening direction in sequence; and the disassembly is completed.

[0132] Example 8

[0133] like Fig.23 As shown, the present invention provides a fastening screw that is not easy to loosen. The difference between the embodiment 7 and the embodiment 7 is that the head end of the small screw rod 20 is an inner cross hole, and the clamping head 81 of the spring piece 80 is a matching straight-shaped clamping head.

[0134] The present invention provides a method for installing a fastening screw, which is consistent with Example 7.

[0135] The present invention provides a method for disassembling a fastening screw, which is consistent with Example 7.

[0136] The advantages of the present invention are:

[0137] The invention realizes self-locking during assembly by having the large screw and the small screw with external threads in opposite directions;

[0138] The present invention uses a locking mechanism composed of a sleeve cap, a driving plate and a rotating member, the locking mechanism presses the small screw, and the small screw presses the large screw; and the top pin of the sleeve cap is correspondingly stuck in the top groove of the rotating member, so that the small screw can only rotate in the tightening direction and cannot rotate in the loosening direction, thereby completing the locking of the large screw, the small screw and the workpiece, and achieving the goal of not being easy to loosen;

[0139] The present invention realizes locking of the driving plate by selecting a top groove with an acute opening angle; that is, only by rotating the small screw rod by a preset angle in the tightening direction until the ejector pin has the condition to be separated from the top groove; then, the driving plate is rotated and the column is moved to drive the ejector pin to be separated from the top groove of the rotating part, so as to realize disassembly, which is more suitable for occasions with higher locking requirements;

[0140] The present invention locks the large screw, the small screw and the workpiece by pressing the small screw with the spring piece and the large screw with the small screw, so as to prevent them from loosening easily.

[0141] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A fastening screw that is not easy to loosen, characterized in that: include: Large screw, small screw and workpiece; The large screw is provided with a through hole for the small screw to pass through, the workpiece is provided with a large internal threaded hole and a small internal threaded hole in a stage shape, the external threads of the large screw and the small screw have opposite rotation directions or the same rotation directions and different pitches; the tail end of the large screw is assembled in the large internal threaded hole, and the tail end of the small screw is assembled in the small internal threaded hole after passing through the through hole; The head end of the large screw is covered with a cap matched with the head end, and a plurality of ejector pins are arranged on the cap; a driving plate with a central hole is provided on the cap, and a plurality of toggle posts at the bottom of the driving plate are correspondingly placed in the toggle holes of each ejector pin; a rotating member is installed below the head end of the small screw, and a plurality of top grooves are arranged on the rotating member; The rotating member is placed in the middle of the ejector pin and the ejector pin is correspondingly stuck in the ejector groove, so that the small screw can rotate in the tightening direction but cannot rotate in the loosening direction, thereby realizing the locking of the large screw, the small screw and the workpiece; The opening angle of the top groove is an acute angle, and the method for disassembling the fastening screw is as follows: rotate the small screw by a preset angle in the tightening direction until the ejector pin is in a condition to be disengaged from the top groove; then, rotate the drive plate, and the toggle column drives the ejector pin to be disengaged from the top groove of the rotating part; finally, rotate and disassemble the small screw and the large screw in the loosening direction in turn.

2. The fastening screw according to claim 1, characterized in that The large screw, the small screw, the workpiece, the sleeve cap, the driving plate and the rotating member are coaxially arranged; The lower surface of the rotating member is pressed against the head end of the large screw, and the upper surface is higher than the upper surface of the driving plate; The rotating member and the small screw are an integrated structure, or a coaxial prism mounting platform is provided below the head end of the small screw, and the center hole of the rotating member is fitted on the prism mounting platform; the rotation of the small screw can drive the rotating member to rotate.

3. A fastening screw that is not easy to loosen, characterized in that: include: Large screw, small screw and nut; The large screw is provided with a small internal threaded hole matched with the small screw, the nut has a large internal threaded hole matched with the large screw, the nut is provided with a gasket with a small center hole, the external threads of the large screw and the small screw have opposite rotation directions or the same rotation directions and different pitches; the tail end of the large screw is assembled in the large internal threaded hole, and the tail end of the small screw passes through the gasket and is relatively assembled in the small internal threaded hole; The nut is covered with a cap that matches the nut, and a plurality of ejector pins are arranged on the cap; a driving plate with a central hole is provided on the cap, and a plurality of toggle posts at the bottom of the driving plate are correspondingly placed in the toggle holes of each ejector pin; a rotating member is installed below the head end of the small screw, and a plurality of top grooves are arranged on the rotating member; The rotating member is placed in the middle of the ejector pin and the ejector pin is correspondingly stuck in the ejector groove, so that the small screw can rotate in the tightening direction but cannot rotate in the loosening direction, thereby locking the large screw, the small screw and the nut; The opening angle of the top groove is an acute angle, and the method for disassembling the fastening screw is as follows: rotate the small screw by a preset angle in the tightening direction until the ejector pin is in a condition to be disengaged from the top groove; then, rotate the drive plate, and the toggle column drives the ejector pin to be disengaged from the top groove of the rotating part; finally, rotate and disassemble the small screw and the large screw in the loosening direction in turn.

4. The fastening screw according to claim 3, characterized in that: The large screw, small screw, nut, sleeve cap, drive plate and rotating member are coaxially arranged; The lower surface of the rotating member is pressed on the gasket, and the upper surface is higher than the upper surface of the driving plate; The rotating member and the small screw are an integrated structure, or a coaxial prism mounting platform is provided below the head end of the small screw, and the center hole of the rotating member is fitted on the prism mounting platform; the rotation of the small screw can drive the rotating member to rotate.

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