A self-locking device and its usage method

Abstract

This invention discloses a self-locking device and its usage method. The self-locking device includes a self-locking adjustable lead screw, a base, and a threaded sleeve. The self-locking adjustable lead screw includes a lead screw, a self-locking plate, and a connecting end. One end of the lead screw has a rotating screw hole, and a notch is provided on the side wall of the rotating screw hole, within which a rotating shaft is disposed. One end of the self-locking plate has a shaft hole, through which the self-locking plate is rotatably mounted on the rotating shaft. The bottom threaded sleeve has a threaded hole that matches the lead screw, and the threaded sleeve is threadedly connected to the lead screw. The side wall of the threaded hole has a self-locking opening extending downward from the top. When the self-locking plate and the self-locking opening are aligned, the self-locking plate can be inserted into the self-locking opening, locking the lead screw in a locked state. This prevents the threaded sleeve from loosening with the lead screw, and the self-locking operation is convenient, simple, and highly safe.

Description

Technical Field

[0001] This invention relates to the field of support and leveling equipment technology, specifically to a self-locking device and its usage method. Background Technology

[0002] Almost every construction project involving a basement structure uses trestle bridges to provide a work area from the excavation stage to the basement construction stage. Currently, an increasing number of projects are adopting trestle bridge panels composed of steel structural components, also known as steel trestle bridge panels. Before laying steel trestle bridge panels, the flatness of the concrete support points at the bottom is extremely important. If the steel trestle bridge panels are laid on uneven support points, they are prone to tilting when vehicles drive over them, leading to issues such as panel displacement, loosening of locking nuts, and other safety hazards.

[0003] In the market, the common practice is to place rubber pads or sand under the steel trestle decks to prevent them from warping. However, as the service life increases, the rubber pads may age and the sand layer may loosen under dynamic loads. This method of leveling is complicated and poses significant safety hazards. Summary of the Invention

[0004] In view of the problems of complex and inefficient operation of supporting and leveling steel trestle panels in existing technology, and the safety hazards caused by loose locking nuts, this application provides a self-locking device and its usage method, which facilitates the support and leveling of steel trestle panels and can avoid the safety hazards caused by loose locking nuts.

[0005] To solve the above technical problems, the present invention includes the following technical solutions:

[0006] A self-locking device, the self-locking device comprising:

[0007] The self-locking adjustable lead screw includes a lead screw, a self-locking plate, and a connecting end; one end of the lead screw is provided with a rotating screw hole, and a notch is provided on the side wall of the rotating screw hole, and a rotating shaft is provided in the notch; one end of the self-locking plate is provided with a shaft hole, and the self-locking plate is rotatably mounted on the rotating shaft through the shaft hole;

[0008] A base, which supports a lead screw, wherein the connecting end of the lead screw is connected to the base; and,

[0009] A threaded sleeve, wherein a threaded hole matching a lead screw is provided inside the threaded sleeve, and the threaded sleeve is threadedly connected to the lead screw; a self-locking opening extending downward from the top is provided on the side wall of the threaded hole.

[0010] When the self-locking plate and the self-locking hole are in opposite positions, the self-locking plate can be inserted into the self-locking hole, so that the lead screw is in a locked state.

[0011] Furthermore, the self-locking plate has a connecting end with a rotating shaft at one end and a free end at the other end; when the free end of the self-locking plate extends outward, the connecting end extends into the rotating screw hole;

[0012] The rotating screw hole is used to set a wrench that rotates the lead screw. When the wrench is inserted into the rotating screw hole, the connecting end of the self-locking plate is pressed down, causing the free end of the self-locking plate to rise and move out of the self-locking hole, so that the lead screw is in the unlocked state.

[0013] Furthermore, when the self-locking plate is in a vertical state, the shaft hole is located between the vertical line of the self-locking plate's center of gravity and the central axis of the lead screw; under its own weight, the self-locking plate rotates around the shaft, causing the end of the self-locking plate away from the shaft to extend outward.

[0014] Furthermore, a torsion spring is provided between the rotating shaft and the self-locking plate. Under the action of the torsion spring, the self-locking plate rotates around the rotating shaft, causing the end of the self-locking plate away from the rotating shaft to extend outward.

[0015] Furthermore, the connecting end of the lead screw is a universal ball joint, and one end of the lead screw is fixedly connected to the universal ball joint;

[0016] The base includes a frustum-shaped base body and a base cover. The top of the base body is provided with a hemispherical mounting groove that matches the universal ball, and the universal ball rests in the mounting groove. The base cover is flared, and the diameter of the top hole is larger than the diameter of the lead screw but smaller than the diameter of the universal ball.

[0017] The ball joint is located between the base body and the base cover, and can rotate within a certain range within the mounting slot.

[0018] Accordingly, this application provides a method for using a self-locking device, the self-locking device being used to support a steel trestle deck, the steel trestle deck including a first panel, a second panel, and a supporting frame; the supporting frame being disposed between the first panel and the second panel and fixedly connected to the first panel and the second panel; the method of use includes the following steps:

[0019] Step 1: Install the self-locking device at the four corners of the steel trestle panel. The base of the self-locking device is set at the resting point below the second panel, and the threaded sleeve is fixed between the first panel and the second panel. Vertical through holes are provided at corresponding positions on the first panel and the second panel.

[0020] Step 2: Insert the wrench into the rotating screw hole to raise the end of the self-locking plate away from the shaft, so that the screw is in the unlocked state;

[0021] Step 3: Turn the wrench to adjust the length of the lead screw inserted into the threaded sleeve so that the flatness of the steel trestle plate meets the requirements and the self-locking plate corresponds to a self-locking hole. Pull out the wrench, and the self-locking plate will rotate so that the end away from the rotating shaft is locked in the self-locking hole, putting the lead screw in the locked state.

[0022] Furthermore, the self-locking plate has a connecting end with a rotating shaft at one end and a free end at the other end; when the free end of the self-locking plate extends outward, the connecting end extends into the rotating screw hole;

[0023] In step two, when the wrench is inserted into the rotating screw hole, the wrench presses down on one end of the self-locking plate located in the rotating screw hole, causing the other end of the self-locking plate to rise. This makes the distance between the raised end of the self-locking plate and the central axis of the screw less than the radius of the threaded hole, thereby putting the screw in the unlocked state.

[0024] Furthermore, when the self-locking plate is in a vertical position, the shaft hole is located between the vertical line of the self-locking plate's center of gravity and the central axis of the lead screw;

[0025] In step three, after the wrench is pulled out, the self-locking plate rotates around the shaft under its own weight, causing the end of the self-locking plate away from the shaft to be inserted into the self-locking hole.

[0026] Furthermore, a torsion spring is provided between the rotating shaft and the self-locking plate;

[0027] In step three, after the wrench is pulled out, under the torque of the torsion spring, the self-locking plate rotates around the shaft, causing the end of the self-locking plate away from the shaft to be inserted into the self-locking hole.

[0028] Furthermore, the connecting end of the lead screw is a universal ball, and one end of the lead screw is fixedly connected to the universal ball; the base includes a frustum-shaped base body and a base cover, the top of the base body is provided with a hemispherical mounting groove that matches the universal ball, and the universal ball rests in the mounting groove; the base cover is flared, and the diameter of the top hole is larger than the diameter of the lead screw but smaller than the diameter of the universal ball; the universal ball is located between the base body and the base cover, and can rotate within a certain range in the mounting groove;

[0029] When the surface of the seat body's resting point is tilted, the seat body rotates around the universal ball, causing the seat body to fit against the resting point.

[0030] The present invention, by adopting the above technical solutions, has the following advantages and positive effects compared with the prior art: The self-locking device provided in this application allows the self-locking plate to be inserted into the self-locking hole when the self-locking plate and the self-locking hole are aligned, thus locking the screw and preventing the threaded sleeve from loosening. The self-locking operation is convenient, simple, and highly safe. When the free end of the self-locking plate extends outward, the connecting end extends into the rotating screw hole, enabling simultaneous wrench insertion and screw unlocking, without requiring additional operation. By setting the position of the shaft hole on the self-locking plate and / or setting a torsion spring, this application enables simultaneous wrench removal and screw self-locking, automatically locking the screw without additional operation. The connecting end of the screw is a universal ball, and the base includes a frustum-shaped seat body and a seat cover. When the surface of the resting point below the seat body is tilted, the seat body rotates around the universal ball, causing the seat body to fit against the resting point. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the self-locking device in one embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram showing the connection between the self-locking adjustable lead screw and the base in one embodiment of the present invention;

[0033] Figure 3 This is a schematic diagram of the structure of a threaded sleeve in one embodiment of the present invention;

[0034] Figure 4 This is a cross-sectional view of a threaded sleeve according to an embodiment of the present invention;

[0035] Figure 5 This is a schematic diagram of the connection between the self-locking adjustable lead screw and the threaded sleeve in one embodiment of the present invention;

[0036] Figure 6 This is a schematic diagram of the structure of a self-locking adjustable lead screw in one embodiment of the present invention;

[0037] Figure 7 This is a schematic diagram of the installation of the self-locking adjustable lead screw and the base in one embodiment of the present invention;

[0038] Figure 8 This is a schematic diagram of the structure of a steel trestle deck in one embodiment of the present invention;

[0039] Figure 9 This is a cross-sectional view of a steel trestle deck in one embodiment of the present invention;

[0040] Figure 10 This is a schematic diagram of a self-locking device installed at the corner of a steel trestle deck in one embodiment of the present invention;

[0041] Figure 11 This is a schematic diagram of the leveling of the self-locking device in one embodiment of the present invention.

[0042] The numbers in the diagram are as follows:

[0043] 1-First panel; 2-Second panel; 3-Supporting frame; 4-Triangular bent plate; 5-Arc-shaped rib; 6-Arc segment;

[0044] 10-Self-locking adjustable lead screw; 11-Lead screw; 111-Rotary screw hole; 112-Notch; 12-Self-locking plate; 13-Connecting end;

[0045] 20-Base; 21-Base body; 22-Base cover; 23-Mounting slot;

[0046] 30 - Threaded sleeve; 31 - Threaded hole; 32 - Self-locking opening. Detailed Implementation

[0047] The self-locking device provided by the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer from the following description. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0048] Example 1

[0049] like Figure 1 As shown, the self-locking device provided in this embodiment includes a self-locking adjustable lead screw 10, a base 20, and a threaded sleeve 30.

[0050] Combination Figure 1 , Figure 2 and Figure 6 As shown, the self-locking adjustable lead screw 10 includes a lead screw 11, a self-locking plate 12, and a connecting end 13. One end of the lead screw 11 has a rotating screw hole 111. In this embodiment, the rotating screw hole 111 is an internal hexagonal socket hole, used to hold an internal hexagonal wrench to rotate the lead screw 11. The rotating screw hole 111 extends downwards from the top along the central axis of the lead screw 11 to a certain depth, for example, 20mm. The circumscribed circle radius of the rotating screw hole 111 is smaller than the radius of the lead screw 11. A notch 112 is provided on the side wall of the rotating screw hole 111, and a rotating shaft is installed within the notch 112. The axis of the rotating shaft is horizontally positioned. The self-locking plate 12 has a shaft hole at one end, allowing it to rotatably mount on a rotating shaft. The self-locking plate 12 can rotate within a certain angle range around the shaft. For example, when the self-locking plate 12 rotates away from the rotating screw hole 111, it can rest on the side wall below the notch, causing one end of the self-locking plate 12 to extend out of the lead screw 11. At this time, the other end of the self-locking plate 12 is located within the rotating screw hole 111. The end of the self-locking plate 12 with the rotating shaft is called the connecting end, and the other end is called the free end. The connecting end 13 of the lead screw 11 is connected to the base 20, which supports the lead screw 11.

[0051] Combination Figures 1 to 4 As shown, the threaded sleeve 30 is provided with a threaded hole 31 that matches the lead screw 11, and the threaded sleeve 30 is threadedly connected to the lead screw 11. A self-locking port 32 extending downwards from the top is provided on the side wall of the threaded hole 31, opening towards the inside of the threaded hole. Several self-locking ports 32 are provided at equal angles around the threaded hole 31, for example... Figure 4 The threaded sleeve 30 is provided with eight self-locking ports 32. The height of the self-locking ports 32 is set as needed, and the depth of the self-locking ports 32 matches the distance that the self-locking plate 12 can extend out of the lead screw 11.

[0052] The working principle of the self-locking device provided in this embodiment is as follows: when a hexagonal wrench is inserted into the hexagonal screw hole, the hexagonal wrench presses down on one end of the self-locking plate 12 located in the rotating screw hole 111, causing the other end of the self-locking plate 12 to rise. The distance between the raised end of the self-locking plate 12 and the central axis of the screw rod 11 is less than the radius of the threaded hole 31, so that the screw rod is in the unlocked state. Rotating the hexagonal wrench causes the screw rod 11 to rotate, so that the length of the threaded sleeve 30 of the screw rod 11 meets the requirements, and the self-locking plate 12 corresponds to a self-locking port 32. When the hexagonal wrench is pulled out, the self-locking plate 12 rotates and the free end is locked in the self-locking port 32, so that the screw rod 11 is in the locked state, and the screw rod and the threaded sleeve 30 are connected as one unit.

[0053] In one specific embodiment, when the self-locking plate 12 is in a vertical position, the shaft hole is located between the vertical line of the center of gravity of the self-locking plate 12 and the central axis of the lead screw 11. Under its own weight, the self-locking plate 12 rotates around the shaft, causing its free end to extend out of the lead screw 11. Therefore, when the hex wrench is pulled out of the rotating screw hole 111, the free end of the self-locking plate 12 automatically inserts into the self-locking port 32 under its own weight, completing the self-locking operation.

[0054] In one specific embodiment, a torsion spring is provided between the rotating shaft and the self-locking plate 12. The torsion spring gives the self-locking plate 12 the potential energy to rotate around the rotating shaft, causing the free end of the self-locking plate 12 to extend out of the screw 11. Therefore, when the hex wrench is pulled out from the rotating screw hole 111, the free end of the self-locking plate 12 is inserted into the self-locking port 32 under the torsion force of the torsion spring, completing the self-locking operation.

[0055] In one specific embodiment, combined with Figure 1 , Figure 2 , Figure 6 , Figure 7 As shown, the connecting end 13 of the lead screw 11 is a universal ball joint, and one end of the lead screw 11 is welded to the universal ball joint. The base 20 includes a frustum-shaped base body 21 and a base cover 22. The top of the base body 21 is provided with a hemispherical mounting groove 23 that matches the universal ball joint, and the universal ball joint rests in the mounting groove 23. The base cover 22 is flared, and the diameter of the top hole is larger than the diameter of the lead screw 11 but smaller than the diameter of the universal ball joint. The universal ball joint is located between the base body 21 and the base cover 22 and can rotate within a certain range within the mounting groove 23. In use, first, the seat cover 22 is fitted onto the lead screw 11, so that the seat cover 22 and the seat body 21 are spliced ​​together. The seat cover 22 and the seat body 21 can be fixed by welding or bolts. Then, the threaded sleeve 30 is fitted onto the lead screw 11, and the length of the lead screw 11 inserted into the threaded sleeve 30 is adjusted. Then, the self-locking piece 12 is inserted into the self-locking port 32. When the support point under the seat body is uneven or tilted, the seat body can rotate around the universal ball so that the bottom of the seat body 21 is always in contact with the support point.

[0056] Example 2

[0057] This embodiment provides a method for using a self-locking device, which is applied to a steel trestle deck to achieve leveling of the deck. Combined with... Figure 8 and Figure 9 As shown, the steel trestle provided in this embodiment includes a first panel 1, a second panel 2, a supporting frame 3, and a triangular bent plate 4. The supporting frame 3 is disposed between the first panel 1 and the second panel 2 and is fixedly connected to the first panel 1 and the second panel 2. The triangular bent plate 4 is disposed within the space enclosed by the first panel 1, the second panel 2, and the supporting frame 3; the top and bottom of the triangular bent plate 4 are in contact with the first panel 1 and the second panel 2 respectively, and its ends are welded and fixed to the supporting frame 3. The first panel 1 and the second panel 2 are made of patterned plates, one side of which is provided with several arc-shaped ribs 5 at intervals, and the other side forms arc-shaped grooves at positions corresponding to the arc-shaped ribs. The apex of the triangular bent plate 4 is an arc segment 6, the radius of which matches the arc-shaped groove, and the arc segment 6 of the triangular bent plate 4 is inserted into the arc-shaped groove. The triangular bent plate 4 includes several upper support points and several lower support points, which are spaced apart. The upper support points are used to connect to the first panel 1, and the lower support points are used to connect to the second panel 2. The lower support point and the second panel 2 can be fixed by spot welding.

[0058] The following is combined with Figures 1 to 10 The method of use is further described below. The method of use includes the following steps:

[0059] Step 1: Install the self-locking device at the four corners of the steel trestle panel. The base 20 of the self-locking device is set at the resting point below the second panel, and the threaded sleeve 30 is fixed between the first panel and the second panel. Vertical through holes are provided at corresponding positions on the first panel and the second panel.

[0060] Step 2: Insert the wrench into the rotating screw hole 111 to separate the end of the self-locking plate 12 away from the rotating shaft from the self-locking port 32;

[0061] Step 3: Turn the wrench to adjust the length of the lead screw inserted into the threaded sleeve 30 so that the flatness of the steel trestle plate meets the requirements and the self-locking plate 12 is aligned with a self-locking port 32. Pull out the wrench, and the self-locking plate 12 rotates so that the end away from the rotating shaft is locked in the self-locking port 32, so that the lead screw 11 is in the locked state.

[0062] In one specific embodiment, the self-locking plate 12 has a connecting end with a rotating shaft at one end and a free end at the other. When the free end of the self-locking plate 12 extends outward, the connecting end extends into the rotating screw hole 111. In step two, when the wrench is inserted into the rotating screw hole 111, the wrench presses down on one end of the self-locking plate 12 located in the rotating screw hole 111, causing the other end of the self-locking plate 12 to rise. This makes the distance between the raised end of the self-locking plate 12 and the central axis of the lead screw 11 less than the radius of the threaded hole 31, thereby separating the end of the self-locking plate 12 away from the rotating shaft from the self-locking port 32. This embodiment can achieve synchronous wrench insertion and lead screw 11 unlocking, and lead screw 11 unlocking requires no additional operation.

[0063] In one specific embodiment, when the self-locking plate 12 is in a vertical state, the shaft hole is located between the vertical line of the center of gravity of the self-locking plate 12 and the central axis of the lead screw 11. In step three, after the wrench is pulled out, under its own weight, the self-locking plate 12 rotates around the pivot, causing the end of the self-locking plate 12 away from the pivot to be inserted into the self-locking port 32. This embodiment can achieve simultaneous completion of wrench pulling out and lead screw 11 self-locking. The self-locking of lead screw 11 can be completed solely by its own weight, without any additional operation.

[0064] In one specific embodiment, a torsion spring is provided between the rotating shaft and the self-locking plate 12; in step three, after the wrench is pulled out, under the torque of the torsion spring, the self-locking plate 12 rotates around the rotating shaft, causing the end of the self-locking plate 12 away from the rotating shaft to insert into the self-locking port 32. This embodiment can achieve simultaneous completion of wrench pulling out and lead screw 11 self-locking, with lead screw 11 relying on the torsion spring for self-locking, requiring no additional operation.

[0065] In one specific embodiment, combined with Figure 1 , Figure 2 , Figure 6 , Figures 7 to 11 As shown, the connecting end 13 of the lead screw 11 is a universal ball, and one end of the lead screw 11 is fixedly connected to the universal ball. The base 20 includes a frustum-shaped base body 21 and a base cover 22. The top of the base body 21 is provided with a hemispherical mounting groove 23 that matches the universal ball, and the universal ball rests in the mounting groove 23. The base cover 22 is flared, and the diameter of the top hole is larger than the diameter of the lead screw 11 but smaller than the diameter of the universal ball. The universal ball is located between the base body 21 and the base cover 22 and can rotate within a certain range in the mounting groove 23. When the surface of the resting point of the base body 21 is tilted, the base body 21 rotates around the universal ball, so that the base body 21 fits against the resting point. This embodiment can achieve the fit between the base body 21 and the resting point when the resting point is uneven, so that the lead screw 11 and the threaded sleeve 30 are in a vertical state, ensuring that the first panel and the second panel are in a horizontal position.

[0066] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0067] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A self-locking device, characterized in that, The self-locking device comprises: a self-locking adjustable screw rod, which comprises a screw rod, a self-locking piece and a connecting end head; one end of the screw rod is provided with a rotating screw hole, a notch is arranged on the side wall of the rotating screw hole, and a rotating shaft is arranged in the notch; one end of the self-locking piece is provided with a shaft hole, and the self-locking piece is rotatably arranged on the rotating shaft through the shaft hole; a base for supporting the screw rod, and the connecting end head of the screw rod is connected with the base; and a threaded sleeve, which is provided with a threaded hole matched with the screw rod in the threaded sleeve, and the threaded sleeve is threadedly connected with the screw rod; a self-locking opening extending from the top to the bottom is arranged on the side wall of the threaded hole; wherein, when the self-locking piece is opposite to the self-locking opening in position, the self-locking piece can be inserted into the self-locking opening, so that the screw rod is in a locked state.

2. The self-locking device according to claim 1, wherein one end of the self-locking piece provided with the rotating shaft is a connecting end, and the other end is a free end; when the free end of the self-locking piece extends outward, the connecting end extends into the rotating screw hole; the rotating screw hole is used for arranging a wrench for rotating the screw rod; when the wrench is inserted into the rotating screw hole, the connecting end of the self-locking piece is pressed down, the free end of the self-locking piece is lifted and moved out of the self-locking opening, and the screw rod is in an unlocked state.

3. The self-locking device according to claim 1 or 2, wherein when the self-locking piece is in a vertical state, the shaft hole is located between the gravity center vertical line of the self-locking piece and the central axis of the screw rod; under the action of gravity, the self-locking piece rotates around the rotating shaft to make the end of the self-locking piece away from the rotating shaft extend outward.

4. The self-locking device according to claim 1 or 2, wherein a torsional spring is arranged between the rotating shaft and the self-locking piece; under the action of the torsional spring, the self-locking piece rotates around the rotating shaft to make the end of the self-locking piece away from the rotating shaft extend outward.

5. The self-locking device according to claim 1 or 2, wherein the connecting end head of the screw rod is a universal ball, and one end of the screw rod is fixedly connected with the universal ball; the base comprises a circular table-shaped base body and a cover, the top of the base body is provided with a hemispherical mounting groove matched with the universal ball, and the universal ball is placed in the mounting groove; the cover is trumpet-shaped, the top hole diameter is greater than the diameter of the screw rod and less than the diameter of the universal ball; the universal ball is located between the base body and the cover and can rotate within a certain range in the mounting groove.

6. A use method of a self-locking device, comprising the following steps: the self-locking device is used for supporting a steel trestle plate, the steel trestle plate comprises a first panel, a second panel and a supporting frame; the supporting frame is arranged between the first panel and the second panel and is fixedly connected with the first panel and the second panel; the use method comprises the following steps: step one: arranging the self-locking device according to claim 1 at four corner portions of the steel trestle plate, arranging the base of the self-locking device at a placement point below the second panel, and fixing the threaded sleeve between the first panel and the second panel; vertical through holes are arranged at corresponding positions on the first panel and the second panel; step two: inserting the wrench into the rotating screw hole to lift the end of the self-locking piece away from the rotating shaft, so that the screw rod is in an unlocked state. Step three, turn the wrench, adjust the length of the screw inserted into the threaded sleeve, make the steel trestle plate flatness meet the requirements, and make the self-locking piece correspond to a self-locking port position, pull out the wrench, and the self-locking piece rotates to make the end away from the rotating shaft buckle in the self-locking port, so that the screw rod is in the locked state.

7. The method of using the self-locking device of claim 6, wherein, The self-locking piece is provided with a connecting end of the rotating shaft and a free end; when the free end of the self-locking piece extends outward, the connecting end extends into the rotating screw hole; In step two, when the wrench is inserted into the rotating screw hole, the wrench presses downward the one end of the self-locking piece in the rotating screw hole, so that the other end of the self-locking piece is lifted, the lifted end of the self-locking piece is closer to the center axis of the screw rod than the radius of the threaded hole, so that the screw rod is in the unlocked state.

8. The method of using the self-locking device of claim 7, wherein, When the self-locking piece is in the vertical state, the shaft hole is located between the gravity center vertical line of the self-locking piece and the center axis of the screw rod; In step three, after pulling out the wrench, the self-locking piece rotates around the rotating shaft under the action of gravity, so that the end of the self-locking piece away from the rotating shaft is inserted into the self-locking port.

9. The method of using the self-locking device of claim 6, wherein, A torsional spring is arranged between the rotating shaft and the self-locking piece; In step three, after pulling out the wrench, the self-locking piece rotates around the rotating shaft under the action of the torsional spring, so that the end of the self-locking piece away from the rotating shaft is inserted into the self-locking port.

10. The method of using the self-locking device of claim 6, wherein, The connecting end of the screw rod is a universal ball, and the screw rod is fixedly connected with the universal ball; the base includes a circular table-shaped base body and a base cover, the top of the base body is provided with a hemispherical mounting groove matched with the universal ball, and the universal ball is placed in the mounting groove; the base cover is trumpet-shaped, the top hole diameter is larger than the diameter of the screw rod and smaller than the diameter of the universal ball; the universal ball is located between the base body and the base cover and can rotate within a certain range in the mounting groove; When the resting point surface of the base body is inclined, the base body rotates around the universal ball to make the base body fit the resting point.

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