Self-tightening removable round head cross drilling screws

Abstract

The present invention relates to a self-tightening detachable round head cross drilling screw, which belongs to the technical field of screws. It comprises a screw rod, a No. 1 nut and a No. 2 nut. One end of the screw rod is provided with a drilling tail, and the other end of the screw rod is fixedly connected to the No. 1 nut. The No. 1 nut is provided with a slot on the side facing away from the screw, and the No. 1 nut is slidably connected with a sliding rod at the slot, and the side of the sliding rod is connected with a connecting rod facing outside the slot, and the connecting rod is connected with the No. 2 nut at one end away from the sliding rod. A first sliding groove is provided in the side wall of the slot, and a sliding block is fixedly connected to the side wall of the sliding block, and the end of the sliding block away from the sliding block extends into the first sliding groove and is slidably connected with the No. 1 nut, and the No. 1 nut is along the second sliding groove on the side wall of the slot, and the No. 1 nut is provided with a third sliding groove on the side wall of the second sliding groove away from the first sliding groove. A pushing component for pushing the sliding rod out of the slot is provided in the slot. The present invention has the effect of improving the applicability of the cross drilling screw.

Description

Technical Field

[0001] The present application relates to the technical field of screws, and in particular to a self-tightening detachable round head cross drilling screw. Background Art

[0002] The cross drill screw is a unique fastener that is widely used in many fields. It plays an important role in many industries such as construction, decoration, and manufacturing with its convenient installation method and strong fastening ability.

[0003] According to the "A Self-tightening Round Head Cross Drilling Screw" [2021.5.11] disclosed in CN202021396174.1, the self-tightening round head cross drill screw includes a screw rod, a drill tail is provided at the bottom of the screw rod, and a self-tightening nut is provided at the top of the screw rod, and the self-tightening nut includes a No. 1 nut and a No. 2 nut, and a connecting rod is provided between the No. 1 nut and the No. 2 nut, and the diameter of the No. 1 nut is larger than that of the No. 2 nut; when there is no relevant tool for disassembling or tightening the self-tightening round head cross drill screw, the staff can manually tighten the No. 1 nut, the No. 1 nut drives the connecting rod to rotate, the connecting rod drives the No. 2 nut to rotate, and the No. 2 nut drives the screw rod to rotate, thereby completing the tightening or disassembly of the screw.

[0004] With regard to the above-mentioned related technologies, after the self-tightening round head cross self-drilling screw is fastened to an object, the No. 1 nut, the connecting rod and the No. 2 nut are all outside the object. The presence of the connecting rod and the No. 1 nut increases the length of the self-tightening round head cross self-drilling screw outside the object, and the connecting rod and the No. 1 nut are not easy to remove, which can easily affect the placement of the object, making the self-tightening round head cross self-drilling screw difficult to use, thereby having the defect of low applicability of the cross self-drilling screw. Summary of the invention

[0005] In order to improve the applicability of the cross self-drilling screw, the present application provides a self-tightening removable round head cross self-drilling screw.

[0006] The self-tightening removable round head cross drilling screw provided in this application adopts the following technical solution:

[0007] A self-tightening detachable round head cross drill screw comprises a screw rod, a No. 1 nut and a No. 2 nut, wherein a drill tail is arranged at one end of the screw rod, and an end of the screw rod away from the drill tail is fixedly connected to the No. 1 nut, characterized in that a slot is provided on the side of the No. 1 nut away from the screw rod, a slide rod is slidably connected to the No. 1 nut at the slot, a connecting rod is connected to the side of the slide rod facing outside the slot, an end of the connecting rod away from the slide rod is connected to the No. 2 nut, a first slide groove is provided on the side wall of the slot along the length direction of the slot, and the first slide groove penetrates the No. 1 nut. On the side of the nut away from the screw rod, a slider is fixedly connected to the side wall of the slide rod, and one end of the slider away from the slide rod extends into the first slide groove, the slider and the No. 1 nut are slidably connected, and the No. 1 nut is provided with a second slide groove for the slider to slide along the circumferential side wall of the slot, and the second slide groove is connected to the first slide groove, and the No. 1 nut is provided with a third slide groove for the slider to slide on a side wall of the second slide groove away from the first slide groove, the length direction of the third slide groove is parallel to the length direction of the first slide groove, and a pushing component for pushing the slide rod out of the slot is provided in the slot.

[0008] By adopting the above technical solution, in the initial state, the slider is in the third slide groove, and the pushing component exerts a force on the slide rod toward the outside of the slot, so that the slider is not easy to disengage from the third slide groove. When tightening the screw, turn the No. 2 nut, the No. 2 nut drives the connecting rod to rotate, the connecting rod drives the slide rod to rotate, the slide rod drives the slider to make a circular motion, the slider drives the No. 1 nut to rotate, and the No. 1 nut drives the screw to rotate. When the No. 1 nut is tightly fitted to the outer surface of the object, the tightening of the screw is completed. When the connecting rod and the No. 2 nut need to be removed, press the No. 2 nut in the direction of the No. 1 nut, and the No. 2 nut drives The connecting rod moves, and the connecting rod drives the sliding rod to move. The sliding rod causes the pushing assembly to retract, and at the same time the sliding rod drives the sliding block to move, and the sliding block moves into the second sliding groove. Then the No. 2 nut is rotated to make the sliding block move into the first sliding groove, and the No. 2 nut is moved away from the No. 1 nut. The No. 2 nut drives the connecting rod to move, and the connecting rod drives the sliding rod to move. The sliding bar drives the sliding block to move out of the first sliding groove, and the sliding block and the No. 1 nut are disengaged, completing the disassembly of the connecting rod and the No. 2 nut, so that the connecting rod and the No. 2 nut are not easily affected by the placement of objects, thereby improving the applicability of the cross self-drilling screw.

[0009] Optionally, the pushing assembly includes a push plate and a spring, the push plate is arranged in the slot, the push plate and the No. 1 nut are slidably connected, and the spring is fixed between the push plate and the bottom wall of the slot.

[0010] By adopting the above technical solution, when the slider is in the second slide groove, the spring is in a compressed state. When the slider moves to the connecting point of the second slide groove and the third slide groove, the spring releases its elastic force, the spring pushes the push plate to move, the push plate pushes the slide rod to move, and the slide rod drives the slider to move, so that the slider moves into the third slide groove, and the spring is still in a compressed state at this time, so that the slider is not easy to slide out of the third slide groove, and the slide rod is not easy to detach from the No. 1 nut.

[0011] Optionally, the connecting rod is hinged to the sliding rod at one end close to the sliding rod, and a first mounting groove for mounting the connecting rod is formed on the side of the No. 2 nut facing the No. 1 nut, and fourth sliding grooves are formed on the opposite side walls of the first mounting groove along the length direction of the first mounting groove. A moving rod is provided in the first mounting groove, and the length direction of the moving rod is perpendicular to the length direction of the first mounting groove. Both ends of the moving rod extend into the fourth sliding grooves on both sides respectively, the moving rod and the No. 2 nut are slidably connected, and an end of the connecting rod away from the sliding rod extends into the first mounting groove, the moving rod passes through the sliding rod, and the moving rod and the sliding rod are rotatably connected.

[0012] By adopting the above technical solution, when tightening the screw, the No. 2 nut is moved in the direction away from the No. 1 nut, and the moving rod moves in the first sliding groove under the guidance of the connecting rod, and the moving rod drives the connecting rod to move in the first receiving groove. When the length direction of the connecting rod is parallel to the length direction of the screw rod, the movement of the No. 2 nut is stopped, and the No. 2 nut is rotated to complete the tightening of the screw. After the tightening is completed, when there is no need to disassemble the connecting rod and the No. 2 nut, the No. 2 nut can be moved in the direction of the No. 1 nut, so that the connecting rod moves to the first receiving groove, reducing the distance between the No. 2 nut and the object, so that the connecting rod and the No. 2 nut are not easy to hinder the movement of surrounding objects.

[0013] Optionally, the diameter of the No. 2 nut is larger than the diameter of the No. 1 nut.

[0014] By adopting the above technical solution, when the worker holds the No. 2 nut, the No. 1 nut is not likely to hinder the movement of the worker's fingers, which provides convenience for the worker to turn the No. 2 nut.

[0015] Optionally, a second placement groove for accommodating the No. 1 nut is provided on a side of the No. 2 nut facing the No. 1 nut, and the second placement groove is connected to the first placement groove.

[0016] By adopting the above technical solution, in the process of moving the No. 2 nut toward the No. 1 nut, the No. 1 nut is gradually inserted into the second placement groove, and the No. 2 nut fits the object. The setting of the second placement groove reduces the distance between the No. 2 nut and the object, so that the connecting rod and the No. 2 nut are not easy to affect the placement of surrounding objects without disassembling the connecting rod and the No. 2 nut.

[0017] Optionally, the No. 2 nut is fixed with a limit block on the side wall of the second mounting groove, and the circumferential side wall of the No. 1 nut is provided with a first displacement groove for movement of the limit block along the length direction of the screw, the first displacement groove runs through the side of the No. 1 nut away from the screw, and the No. 1 nut is provided with a second displacement groove for sliding of the limit block along the circumferential side wall of the No. 1 nut on one side wall of the first displacement groove.

[0018] By adopting the above technical solution, in the process of nut No. 2 moving toward nut No. 1, nut No. 2 drives the limit block to move, and the limit block gradually moves into the first displacement groove. When the limit block moves to the connecting part of the first displacement groove and the second displacement groove, nut No. 1 is in the second placement groove. Nut No. 2 is rotated, nut No. 2 drives the limit block to move, and the limit block moves into the second displacement groove. The blocking effect of the side wall of the second displacement groove on the limit block makes it difficult for the limit block to move in the direction away from the screw rod, thereby making it difficult for nut No. 2 to separate from nut No. 1.

[0019] Optionally, the No. 1 nut is provided with a third displacement groove on a side wall at one end of the second displacement groove away from the first displacement groove, and the length direction of the third displacement groove is parallel to the length direction of the first displacement groove.

[0020] By adopting the above technical scheme, when the limit block moves to the connecting point of the first displacement groove and the second displacement groove, the sliding block moves into the second sliding groove, and the No. 2 nut is rotated so that the limit block moves to the connecting point of the second displacement groove and the third displacement groove, the sliding block moves into the first sliding groove, and the No. 2 nut is loosened, and the pushing component pushes the sliding rod toward the outside of the slot, the sliding rod drives the connecting rod to move, the connecting rod drives the No. 2 nut to move, and the No. 2 nut drives the limit block to move to the third displacement groove. The blocking effect of the side wall of the third displacement groove on the limit block makes it difficult for the limit block to move into the first displacement groove, and further makes it difficult for the No. 2 nut to separate from the No. 1 nut.

[0021] Optionally, an anti-slip groove is provided on the circumferential side wall of the No. 2 nut.

[0022] By adopting the above technical solution and setting the anti-skid groove, the friction between the staff and the No. 2 nut is increased, which provides convenience for the staff to turn the No. 2 nut.

[0023] Optionally, a cross drilled hole is formed on a side of the No. 2 nut facing away from the No. 1 nut.

[0024] By adopting the above technical solution, when there are tools, the staff can tighten the screws with the help of the tools.

[0025] Optionally, a stopper is fixedly provided on the side wall of the push plate, and one end of the stopper away from the push plate extends into the first sliding groove, and the stopper is slidably connected to the No. 1 nut.

[0026] By adopting the above technical solution, after the slide rod and the slot are disengaged, the spring releases its elastic force, pushing the push plate to move out of the slot, and the push plate drives the stopper to move, the stopper blocks the first slide slot, and the push plate blocks the slot, making it difficult for external impurities to enter the slot.

[0027] In summary, the present application includes at least one of the following beneficial technical effects:

[0028] 1. After the screw is tightened, turn the No. 2 nut, the No. 2 nut drives the connecting rod to rotate, the connecting rod drives the sliding rod to rotate, the sliding rod drives the sliding block to move, the sliding block moves to the first sliding slot, the No. 2 nut is moved in the direction away from the No. 1 nut, the No. 2 nut drives the connecting rod to move, the connecting rod drives the sliding rod to move, the sliding rod moves out of the slot, and the disassembly of the connecting rod and the No. 2 nut is completed, so that the connecting rod and the No. 2 nut are not easy to affect the placement of objects, thereby improving the applicability of the cross self-drilling screw;

[0029] 2. The limiting block moves into the third displacement groove, and the side wall of the third displacement groove blocks the limiting block, so that the limiting block is not easy to move into the first displacement groove, thereby making it difficult for the No. 1 nut to be separated from the second placement groove;

[0030] 3. By blocking the slot opening with the push plate and blocking the first slide slot with the stopper, it is difficult for foreign matter to enter the slot. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 1 is a schematic diagram of the structure of a self-tightening detachable round head cross drilling screw according to an embodiment of the present application;

[0032] Figure 2 This is a cross-sectional view of the structure in the second placement groove in the embodiment of the present application;

[0033] Figure 3 It is a structural cross-sectional view of the pushing component in the embodiment of the present application.

[0034] In the figure, 1, screw rod; 11, drill tail; 2, No. 1 nut; 21, slot; 22, slide rod; 221, slider; 23, connecting rod; 24, first slide groove; 25, second slide groove; 26, third slide groove; 27, first displacement groove; 28, second displacement groove; 29, third displacement groove; 3, No. 2 nut; 31, first mounting groove; 32, fourth slide groove; 33, moving rod; 34, second mounting groove; 35, limit block; 36, anti-slip groove; 37, cross drilling; 4, pushing assembly; 41, push plate; 42, spring; 5, stop block. DETAILED DESCRIPTION

[0035] The following is combined with Figure 1-Figure 3 This application is described in further detail.

[0036] The embodiment of the present application discloses a self-tightening detachable round head cross drilling screw.

[0037] refer to Figure 1 The self-tightening detachable round head cross drill screw includes a screw rod 1, a No. 1 nut 2 and a No. 2 nut 3. A drill tail 11 is provided at one end of the screw rod 1. The end of the screw rod 1 away from the drill tail 11 is fixedly connected to the No. 1 nut 2. The No. 2 nut 3 is located on the side of the No. 1 nut 2 away from the screw rod 1. The No. 2 nut 3 is parallel to the No. 1 nut 2. A connecting rod 23 is connected between the No. 2 nut 3 and the No. 1 nut 2. The diameter of the No. 2 nut 3 is greater than the diameter of the No. 1 nut 2.

[0038] When tightening the screws, the staff holds the No. 2 nut 3 and rotates the No. 2 nut 3, the No. 2 nut 3 drives the connecting rod 23 to rotate, the connecting rod 23 drives the No. 1 nut 2 to rotate, and the No. 1 nut 2 drives the screw rod 1 to rotate. After the No. 1 nut 2 and the outer surface of the object are in contact, the tightening of the screws is completed. At the same time, the diameter of the No. 2 nut 3 is larger than the diameter of the No. 1 nut 2, so that when the staff holds the No. 2 nut 3, the No. 1 nut 2 is not easy to cause an obstruction to the staff.

[0039] refer to Figure 1 and Figure 2 The side wall of the No. 2 nut 3 is provided with a plurality of anti-skid grooves 36 , and the plurality of anti-skid grooves 36 are sequentially distributed along the circumferential side wall of the No. 2 nut 3 , and a cross drilled hole 37 is provided on the side of the No. 2 nut 3 away from the No. 1 nut 2 .

[0040] The anti-slip groove 36 is provided to increase the friction between the staff and the No. 2 nut 3, which provides convenience for the staff to rotate the No. 2 nut 3. At the same time, if there are tools, the staff can use the tools to twist the No. 2 nut 3.

[0041] refer to Figure 1 , Figure 2 and Figure 3A slot 21 is provided on the side of the No. 1 nut 2 facing the No. 2 nut 3, and the No. 1 nut 2 is slidably connected to a slide bar 22 at the slot 21. One end of the connecting rod 23 is hinged to the side of the slide bar 22 facing the outside of the slot 21. A first slide groove 24 is provided on the side wall of the No. 1 nut 2 along the length direction of the slot 21. The first slide groove 24 runs through the side of the No. 1 nut 2 facing the No. 2 nut 3. A slider 221 is slidably connected to the No. 1 nut 2 in the first slide groove 24. The side of the slider 221 facing the slide bar 22 is fixedly connected to the slide bar 22. The cap 2 is provided with a second slide groove 25 for the slider 221 to slide along the circumferential side wall of the slot 21. The second slide groove 25 is connected to the first slide groove 24, and the second slide groove 25 is located at the end of the first slide groove 24 away from the No. 2 nut 3. The No. 1 nut 2 is provided with a third slide groove 26 for the slider 221 to slide on the side wall of the second slide groove 25 at one end away from the first slide groove 24. The length direction of the third slide groove 26 is parallel to the length direction of the first slide groove 24. The No. 1 nut 2 is provided with a pushing component 4 in the slot 21 for pushing the slide rod 22 out of the slot 21.

[0042] The pushing assembly 4 includes a push plate 41 and a spring 42. The push plate 41 is arranged in the slot 21. The push plate 41 and the No. 1 nut 2 are parallel to the side wall of the push plate 41 and are fixedly connected with a stopper 5. One end of the stopper 5 away from the push plate 41 extends into the first slide groove 24. The stopper 5 and the No. 1 nut 2 are slidably connected. The spring 42 is fixed between the push plate 41 and the inner bottom wall of the slot 21.

[0043] In the initial state, the slider 221 is in the third slide groove 26, the push plate 41 and the slide rod 22 are in contact, and the spring 42 is in a compressed state. When the screw is tightened, the No. 2 nut 3 is pushed toward the direction of the No. 1 nut 2, the No. 2 nut 3 drives the connecting rod 23 to move, the connecting rod 23 drives the slide rod 22 to move, the slide rod 22 pushes the push plate 41 to move, the spring 42 is further compressed, the push plate 41 drives the stopper 5 to move, and the slide rod 22 drives the slider 221 to move, the slider 221 moves to the second slide groove 25, the No. 2 nut 3 is rotated, and the No. 2 nut 3 drives the slider 221 to move to the first slide groove 25. The second nut 3 is moved in the slot 24 in the direction away from the first nut 2, the second nut 3 drives the connecting rod 23 to move, the connecting rod 23 drives the sliding rod 22 to move, the sliding rod 22 drives the sliding block 221 to move, the sliding block 221 moves out of the first slide slot 24, and the disassembly of the connecting rod 23 and the second nut 3 is completed. At the same time, the spring 42 releases the elastic force, pushing the push plate 41 to move out of the slot 21, the push plate 41 drives the stopper 5 to move, the push plate 41 blocks the open end of the slot 21, and the stopper 5 blocks the first slide slot 24, so that external impurities are not easy to enter the slot 21 and the first slide slot 24.

[0044] refer to Figure 1 , Figure 2 and Figure 3A first mounting groove 31 for accommodating the connecting rod 23 is provided on the side of the No. 2 nut 3 facing the No. 1 nut 2, and fourth sliding grooves 32 are provided on the opposite sides of the first mounting groove 31 along the length direction of the first mounting groove 31. A moving rod 33 is provided in the first mounting groove 31, and the length direction of the moving rod 33 is perpendicular to the length direction of the connecting rod 23. The opposite ends of the moving rod 33 are respectively arranged in the fourth sliding grooves 32 on both sides, and the moving rod 33 and the No. 2 nut 3 are slidingly connected, and one end of the connecting rod 23 close to the No. 2 nut 3 extends into the first mounting groove 31, and the moving rod 33 penetrates the connecting rod 23. The moving rod 33 and the connecting rod 23 are rotatably connected, and a second mounting groove 34 for accommodating the No. 1 nut 2 is provided in the middle part of the side of the No. 2 nut 3 facing the No. 1 nut 2.

[0045] Without disassembling the connecting rod 23 and the second nut 3, and after the screws are tightened, move the second nut 3 toward the first nut 2, the connecting rod 23 is tilted, and drives the moving rod 33 to move in the first placement groove 31. When the first nut 2 moves to the second placement groove 34, the connecting rod 23 is in the first placement groove 31, which reduces the distance between the second nut 3 and the object and is not easy to cause obstacles to the placement of other objects.

[0046] refer to Figure 1 , Figure 2 and Figure 3 The second nut 3 is fixed with a limit block 35 on the side wall of the second placement groove 34, and the side wall of the first nut 2 is provided with a first displacement groove 27 for the limit block 35 to move. The first displacement groove 27 runs through the side of the first nut 2 facing the second nut 3, and the first nut 2 is provided with a second displacement groove 28 for the limit block 35 to slide on the side wall of the end of the first displacement groove 27 away from the second nut 3. The first nut 2 is provided with a third displacement groove 29 for the limit block 35 to slide on the side wall of the end of the second displacement groove 28 away from the first displacement groove 27, and the length direction of the third displacement groove 29 is parallel to the length direction of the first displacement groove 27.

[0047] In the process of the second nut 3 moving toward the first nut 2, the second nut 3 drives the limit block 35 to move. In the process of the first nut 2 gradually being in the second placement groove 34, the limit block 35 moves in the first displacement groove 27. When the limit block 35 moves to the connection point of the first displacement groove 27 and the second displacement groove 28, the second nut 3 is rotated so that the limit block 35 moves to the second displacement groove 28. When the limit block 35 moves to the connection point of the second displacement groove 28 and the third displacement groove 29, Loosen the No. 2 nut 3, the spring 42 releases its elastic force, pushing the push plate 41 to move, the push plate 41 pushes the slide rod 22 to move, the slide rod 22 drives the connecting rod 23 to move, the connecting rod 23 pushes the No. 2 nut 3 to move, the No. 2 nut 3 drives the limit block 35 to move, the limit block 35 moves to the third displacement groove 29, and the blocking effect of the third displacement groove 29 on the limit block 35 makes it difficult for the limit block 35 to move into the first displacement groove 27, thereby making it difficult for the No. 1 nut 2 to disengage from the second placement groove 34.

[0048] The implementation principle of the self-tightening detachable round head cross drill screw of the embodiment of the present application is as follows: in the initial state, the slider 221 is in the third slide groove 26, and at the same time, the push component 4 exerts a force on the slide rod 22 toward the outside of the slot 21, so that the slider 221 is not easy to move into the second slide groove 25. When tightening the screw, the No. 2 nut 3 is rotated, and the No. 2 nut 3 drives the connecting rod 23 to rotate, and the connecting rod 23 drives the slide rod 22 to move, and the slide rod 22 drives the slider 221 to make a circular motion. During the movement of the slider 221, the slider 221 drives the No. 1 nut 2 to rotate, and the No. 1 nut 2 drives the screw 1 to rotate to complete the tightening of the screw. When removing the connecting rod 23 and the No. 2 nut 3, push the No. 2 nut 3 toward the direction of the No. 1 nut 2. The No. 2 nut 3 drives the connecting rod 23 to move, the connecting rod 23 drives the sliding rod 22 to move, the sliding rod 22 drives the sliding block 221 to move, the sliding block 221 moves to the second sliding groove 25, the No. 2 nut 3 is rotated to make the sliding block 221 move to the first sliding groove 24, and the No. 2 nut 3 is moved in the direction away from the No. 1 nut 2, the No. 2 nut 3 drives the connecting rod 23 to move, the connecting rod 23 drives the sliding bar 22 to move, the sliding bar 22 drives the sliding block 221 to move, the sliding block 22 moves to the outside of the first sliding groove 24, the sliding bar 22 and the slot 21 are disengaged, and the disassembly of the connecting rod 23 and the No. 2 nut 3 is completed, so that the connecting rod 23 and the No. 2 nut 3 are not easy to affect the placement of objects, thereby improving the applicability of the cross drill tail 11 screw.

[0049] The embodiments of this specific implementation method are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, all equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A self-tightening detachable round head cross drill screw, comprising a screw rod (1), a No. 1 nut (2) and a No. 2 nut (3), wherein one end of the screw rod (1) is provided with a drill tail (11), and one end of the screw rod (1) away from the drill tail (11) is fixedly connected to the No. 1 nut (2), characterized in that: The first nut (2) is provided with a slot (21) on a side away from the screw rod (1); the first nut (2) is slidably connected to a slide rod (22) at the slot (21); a side of the slide rod (22) facing outside the slot (21) is connected to a connecting rod (23); an end of the connecting rod (23) away from the slide rod (22) is connected to the second nut (3); a first slide groove (24) is provided on a side wall of the slot (21) of the first nut (2) along the length direction of the slot (21); the first slide groove (24) penetrates the side of the first nut (2) away from the screw rod (1); a sliding block (221) is fixedly connected to the side wall of the sliding block (22); an end of the sliding block (221) away from the sliding block (22) extends outward from the sliding block (22). The first nut (2) is slidably connected to the first slide groove (24), and the first nut (2) is provided with a second slide groove (25) on the side wall of the slot (21) along the circumferential side wall of the slot (21) for the slide groove (221) to slide. The second slide groove (25) and the first slide groove (24) are connected. The first nut (2) is provided with a third slide groove (26) on the side wall of the second slide groove (25) away from the first slide groove (24) for the slide groove (221) to slide. The length direction of the third slide groove (26) is parallel to the length direction of the first slide groove (24). A pushing component (4) for pushing the slide rod (22) out of the slot (21) is provided in the slot (21).

2. The self-tightening detachable round head cross drilling screw according to claim 1, characterized in that: The pushing assembly (4) comprises a pushing plate (41) and a spring (42); the pushing plate (41) is arranged in the slot (21); the pushing plate (41) and the No. 1 nut (2) are slidably connected; the spring (42) is fixed between the pushing plate (41) and the inner bottom wall of the slot (21).

3. The self-tightening detachable round head cross drilling screw according to claim 1, characterized in that: The end of the connecting rod (23) close to the sliding rod (22) is hinged to the sliding rod (22); a first accommodating groove (31) for accommodating the connecting rod (23) is provided on a side of the No. 2 nut (3) facing the No. 1 nut (2); the No. 2 nut (3) is provided with fourth sliding grooves (32) on opposite side walls of the first accommodating groove (31) along the length direction of the first accommodating groove (31); a moving rod (33) is provided in the first accommodating groove (31); the length direction of the moving rod (33) is perpendicular to the length direction of the first accommodating groove (31); two ends of the moving rod (33) extend into the fourth sliding grooves (32) on both sides respectively; the moving rod (33) and the No. 2 nut (3) are slidably connected; one end of the connecting rod (23) away from the sliding rod (22) extends into the first accommodating groove (31); the moving rod (33) passes through the sliding rod (22); and the moving rod (33) and the sliding rod (22) are rotatably connected.

4. The self-tightening detachable round head cross drilling screw according to claim 1, characterized in that: The diameter of the No. 2 nut (3) is greater than the diameter of the No. 1 nut (2).

5. The self-tightening detachable round head cross drilling screw according to claim 3, characterized in that: A second placement groove (34) for placing the No. 1 nut (2) is provided on a side of the No. 2 nut (3) facing the No. 1 nut (2), and the second placement groove (34) is connected to the first placement groove (31).

6. The self-tightening detachable round head cross drilling screw according to claim 5, characterized in that: The second nut (3) is fixedly provided with a limit block (35) on the side wall of the second placement groove (34); the circumferential side wall of the first nut (2) is provided with a first displacement groove (27) for allowing the limit block (35) to move along the length direction of the screw rod (1); the first displacement groove (27) penetrates the side of the first nut (2) away from the screw rod (1); the first nut (2) is provided with a second displacement groove (28) for allowing the limit block (35) to slide on a side wall of the first displacement groove (27) along the circumferential side wall of the first nut (2).

7. The self-tightening removable round head cross drilling screw according to claim 6, characterized in that: The No. 1 nut (2) is provided with a third displacement groove (29) on a side wall of an end of the second displacement groove (28) away from the first displacement groove (27), and the length direction of the third displacement groove (29) is parallel to the length direction of the first displacement groove (27).

8. The self-tightening detachable round head cross drilling screw according to claim 1, characterized in that: An anti-slip groove (36) is provided on the circumferential side wall of the No. 2 nut (3).

9. The self-tightening detachable round head cross drilling screw according to claim 1, characterized in that: A cross drilled hole (37) is formed on the side of the No. 2 nut (3) facing away from the No. 1 nut (2).

10. The self-tightening detachable round head cross drilling screw according to claim 2, characterized in that: A stopper (5) is fixedly provided on the side wall of the push plate (41), and one end of the stopper (5) away from the push plate (41) extends into the first slide groove (24), and the stopper (5) is slidably connected to the No. 1 nut (2).

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