Pressing tooth petal nut

Abstract

The utility model relates to the technical field of expansion nuts, and discloses a tooth-pressing petal nut which comprises an expansion piece and a bolt rod arranged in the expansion piece, one end of the expansion piece is fixedly connected with a first gasket, the fastening mode of the scheme is that the bolt rod and a third gasket are directly rotated, and in the process, the bolt rod and the third gasket are tightly screwed. The friction resistance of the gentle slope groove surface to the gentle slope convex surface is small, the rotation of the third gasket is not influenced, the pressure among the third gasket, the second gasket, the plate group, the expansion piece and the first gasket is continuously increased until the plate group is stably fixed, and the fixation of the plate group is completed. The technical problem that the fixing stability of the expansion nut is poor due to vibration can be effectively solved; according to the scheme, the pressing teeth and the tooth grooves are designed in special shapes, so that the non-return pressing teeth clamped into the non-return tooth grooves can be limited in the axis direction of the bolt rod, and the phenomenon that the pressing tooth petal nut is loosened is further avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of expansion nuts, in particular to a pressed tooth petal nut. Background Art

[0002] Expansion nuts are used in the prior art to fix objects to walls. In product processing or construction projects, expansion nuts can also be used to achieve connection and fixation between objects and plates, or connection and fixation between groups of plates.

[0003] For example, the Chinese invention patent with authorization announcement number CN100439724C: an expansion screw discloses the use of upper and lower segments to fold to achieve the purpose of expansion of the horizontal span, thereby realizing the fixing function applied to walls or panels.

[0004] Although the above utility model patent has the function of expansion and fixing, it is easily loosened due to vibration and has poor fixing stability. Therefore, the field is in urgent need of a pressed tooth petal nut to solve the problems existing in the prior art. Utility Model Content

[0005] The utility model aims to provide a pressed tooth petal nut to solve the technical problem of poor fixing stability of expansion nuts in the prior art.

[0006] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions: a pressed tooth petal nut, comprising an expansion piece, and a bolt rod arranged inside the expansion piece, wherein one end of the expansion piece is fixedly connected with a first washer, and a threaded groove is opened on the inner wall of the first washer; the first washer uses the threaded groove to perform a threaded limiting connection with the bolt rod, and the expansion piece is fixedly connected with a second washer at one end away from the first washer; the bolt rod rotates, which can drive the first washer to approach the second washer, so that the expansion piece is compressed and deformed; when in use, a punching tool is first used to punch out slots for mutual cooperation and fixation in a plate group composed of multiple plates that need to be connected and fixed, and the pressed tooth petal nut is inserted into the slot, so that the second washer is close to one end of the expansion piece and is close to the plate group, and then the bolt rod is rotated, and the first washer approaches the direction of the second washer, so that the expansion piece is compressed and deformed on the side of the plate group away from the second washer, and the deformed expansion piece cannot pass through the slot, and the plate group is sandwiched in the middle by the expansion piece and the second washer, thereby realizing the fixing function of the plate group;

[0007] A third washer is fixed to one end of the bolt rod close to the second washer; the third washer is close to one end of the bolt rod and is close to the end of the second washer away from the expansion member;

[0008] The third washer is provided with a back-stop pressure tooth at one end close to the second washer, and the second washer is provided with a back-stop tooth groove matching the shape of the back-stop pressure tooth at one end close to the third washer;

[0009] The anti-return pressure tooth includes a gentle slope convex surface and a steep slope convex surface, and the anti-return tooth groove includes a gentle slope groove surface and a steep slope groove surface; when the anti-return pressure tooth is inserted into the anti-return tooth groove, the gentle slope convex surface is close to the gentle slope groove surface, and the steep slope convex surface is close to the steep slope groove surface;

[0010] By adopting the above technical scheme, the pressed tooth petal nut is first inserted into the slot hole of the plate group, so that the second washer is tightly attached to the plate group, and then the bolt rod and the third washer are rotated. The first washer is driven by the thread and approaches the second washer until the expansion piece is deformed and the side wall of the expansion piece is close to the plate group, thereby completing the pre-fixation of the plate group; then the bolt rod and the third washer are continued to be rotated. In this process, the friction resistance caused by the gentle slope groove surface to the gentle slope convex surface is small, which will not affect the rotation of the third washer. The pressure between the third washer, the second washer, the plate group, the expansion piece and the first washer continues to increase until the plate group is firmly fixed and the fixation of the plate group is completed; when the plate group or the pressed tooth petal nut is vibrated by external force, the steep slope groove surface can clamp the steep slope convex surface to prevent the third washer from reversing and causing loosening. This scheme has a good fixing effect on the plate group and will not cause loosening; in the above scheme, the pressed tooth petal nut is not limited to the fixation of the plate group.

[0011] As a preferred solution, there are a plurality of anti-return pressure teeth, and the anti-return pressure teeth are distributed in a ring array; there are a plurality of anti-return tooth grooves, and the anti-return tooth grooves are distributed in a ring array.

[0012] As a preferred solution, the expansion piece includes a plurality of expansion sheets distributed in a ring array. When the first washer and the second washer are close to each other, the expansion sheets are easy to deform, protecting the first washer from deformation and facilitating the maintenance of the threaded matching function between the first washer and the bolt rod.

[0013] As a preferred solution, the middle of the expansion piece is bent away from the axis of the bolt rod, so that after the expansion piece is deformed, it is easy to fold in half from the middle, and the two folded parts are tightly attached to each other, using large friction to enhance the fixing effect of the plate group.

[0014] As a preferred solution, a hexagonal bolt head is fixed to one end of the third washer away from the bolt rod, and the hexagonal bolt head is used to facilitate driving the bolt rod to rotate, thereby improving the fixing efficiency of the plate group and reducing the difficulty of fixing.

[0015] As a preferred solution, the surface area of ​​the third gasket on a side close to the second gasket is larger than the surface area of ​​the second gasket on a side close to the third gasket.

[0016] As a preferred solution, the strength of the middle portion of the expansion piece is weaker than that of the end portions.

[0017] As a preferred solution, the angle between the gently sloping groove surface and the steeply sloping groove surface is less than 90°, and the angle between the gently sloping convex surface and the steeply sloping convex surface is less than 90°, so that the anti-return pressure tooth inserted into the anti-return tooth groove can be limited in the axial direction of the bolt rod, thereby preventing the third washer from being displaced in the axial direction of the bolt rod due to severe vibration, and further preventing the pressure tooth petal nut from loosening.

[0018] Beneficial effects:

[0019] 1. This solution is designed to use the method of pressing teeth to match the tooth grooves, which can effectively avoid the technical problem of poor fixing stability of the expansion nut caused by vibration, and with the electric wrench, it has the beneficial effect of appropriate tightening degree and will not cause over-tightening;

[0020] 2. This solution designs the special shape of the pressing teeth and the tooth grooves, so that the anti-return pressing teeth inserted into the anti-return tooth grooves can be limited in the direction of the bolt rod axis, which can prevent the third washer from being displaced in the direction of the bolt rod axis due to severe vibration, and further prevent the pressing tooth petal nut from loosening;

[0021] 3. This solution has a simple and compact structure, low production cost and strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0023] Figure 1 The overall structural diagram provided for the embodiment 1 of the utility model;

[0024] Figure 2 A front view provided for Example 1 of the utility model;

[0025] Figure 3 A detailed structural diagram of the second gasket area provided in Example 1 of the utility model;

[0026] Figure 4 A detailed structural diagram of the third gasket area provided in Example 1 of the utility model;

[0027] Figure 5 Provided for the utility model embodiment 1 Figure 2 A magnified image of area A;

[0028] Figure 6 Based on the embodiment 2 of the present utility model Figure 5 Deformation diagram of ;

[0029] Figure 7 Provided for the utility model embodiment 1 Figure 3 Enlarged view of area B;

[0030] Figure 8 Provided for the utility model embodiment 1 Figure 4 Enlarged view of area C.

[0031] Description of reference numerals:

[0032] 101, first washer; 102, thread groove; 103, expansion piece; 104, second washer; 105, check tooth groove; 201, bolt rod; 202, bolt head; 203, third washer; 204, check pressure tooth; 401, gently convex surface; 402, steep convex surface; 501, gently sloping groove surface; 502, steep groove surface. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0034] Embodiment 1, as Figure 1-Figure 5 , Figure 7 , Figure 8 As shown, the pressed tooth petal nut includes an expansion piece and a bolt rod 201 arranged inside the expansion piece. A first washer 101 is integrally formed at one end of the expansion piece, and a thread groove 102 is opened on the inner wall of the first washer 101; the first washer 101 is threadedly limitedly connected with the bolt rod 201 by using the thread groove 102, and a second washer 104 is integrally formed at one end of the expansion piece away from the first washer 101; the bolt rod 201 rotates to drive the first washer 101 to approach the second washer 104, so that the expansion piece is compressed and deformed; when in use, first use a punch to The hole tool is used to punch out slots for mutual cooperation and fixation in a plate group composed of multiple plates that need to be connected and fixed, and the pressed tooth petal nut is inserted into the slot, so that the second washer 104 is close to the end of the expansion member and is close to the plate group, and then the bolt rod 201 is rotated, and the first washer 101 is close to the second washer 104, so that the expansion member is compressed and deformed on the side of the plate group away from the second washer 104, and the deformed expansion member cannot pass through the slot, and the plate group is clamped by the expansion member and the second washer 104, so that the fixing function of the plate group is realized;

[0035] A third washer 203 is integrally formed at one end of the bolt rod 201 close to the second washer 104; the third washer 203 is close to one end of the bolt rod 201 and is close to one end of the second washer 104 away from the expansion member;

[0036] The third washer 203 is punched and milled at one end close to the second washer 104 to form a back-stop pressure tooth 204, and the second washer 104 is punched and milled at one end close to the third washer 203 to form a back-stop tooth groove 105 that matches the shape of the back-stop pressure tooth 204;

[0037] The anti-return pressure tooth 204 includes a gently convex surface 401 and a steeply convex surface 402, and the anti-return tooth groove 105 includes a gently convex groove surface 501 and a steeply convex groove surface 502; when the anti-return pressure tooth 204 is inserted into the anti-return tooth groove 105, the gently convex surface 401 is close to the gently convex groove surface 501, and the steeply convex surface 402 is close to the steeply convex groove surface 502;

[0038] By adopting the above technical solution, the pressed tooth petal nut is first inserted into the slot of the plate group, so that the second washer 104 is tightly attached to the plate group, and then the bolt rod 201 and the third washer 203 are rotated. The first washer 101 is driven by the thread to approach the second washer 104 until the expansion member is deformed and the side wall of the expansion member is close to the plate group, thus completing the pre-fixation of the plate group; and then the bolt rod 201 and the third washer 203 are continuously rotated. In this process, the gently sloped groove surface 501 causes the gently sloped convex surface 401 to be bent. The friction resistance is small and will not affect the rotation of the third washer 203. The pressure among the third washer 203, the second washer 104, the plate group, the expansion piece and the first washer 101 increases continuously until the plate group is firmly fixed and the fixation of the plate group is completed. When the plate group or the pressed tooth petal nut is vibrated by external force, the steep slope groove surface 502 can clamp the steep slope convex surface 402 to prevent the third washer 203 from reversing and loosening. This solution has a good fixing effect on the plate group and will not cause loosening.

[0039] There are a plurality of anti-return pressure teeth 204 , and the anti-return pressure teeth 204 are distributed in a ring array; there are a plurality of anti-return tooth grooves 105 , and the anti-return tooth grooves 105 are distributed in a ring array.

[0040] The expansion piece includes a plurality of expansion sheets 103 distributed in a circular array. When the first washer 101 and the second washer 104 are close to each other, the expansion sheets 103 are easy to deform, so as to protect the first washer 101 from deformation, thereby facilitating the threaded fitting function between the first washer 101 and the bolt rod 201.

[0041] The middle part of the expansion piece 103 is bent away from the axis of the bolt rod 201, so that after the expansion piece 103 is deformed, it is easy to fold in half from the middle, and the two folded parts are tightly attached to each other, using large friction to enhance the fixing effect of the plate group.

[0042] A hexagonal bolt head 202 is integrally formed at one end of the third washer 203 away from the bolt rod 201 . The hexagonal bolt head 202 facilitates driving the bolt rod 201 to rotate, thereby improving the fixing efficiency of the plate group and reducing the difficulty of fixing.

[0043] The surface area of ​​the third gasket 203 close to the second gasket 104 is greater than the surface area of ​​the second gasket 104 close to the third gasket 203 .

[0044] The strength of the middle part of the expansion piece is weaker than that of the end parts.

[0045] Embodiment 2, as Figure 6 As shown, on the basis of the technical solution of Example 1, the angle between the gently sloping groove surface 501 and the steeply sloping groove surface 502 is 80°, and the angle between the gently sloping convex surface 401 and the steeply sloping convex surface 402 is 80°, so that the anti-return pressure tooth 204 inserted into the anti-return tooth groove 105 can be limited in the axial direction of the bolt rod 201, and can avoid the displacement of the third washer 203 in the axial direction of the bolt rod 201 caused by severe vibration, and further avoid the loosening of the pressure tooth petal nut.

[0046] The above only describes some exemplary embodiments of the present invention by way of illustration. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. Pressed tooth petal nut, characterized in that: The invention comprises an expansion member and a bolt rod (201) arranged inside the expansion member, wherein one end of the expansion member is fixedly connected with a first washer (101), and a thread groove (102) is provided on the inner wall of the first washer (101); the first washer (101) is threadedly limitedly connected with the bolt rod (201) by means of the thread groove (102), and the end of the expansion member away from the first washer (101) is fixedly connected with a second washer (104); A third washer (203) is fixed to one end of the bolt rod (201) close to the second washer (104); the third washer (203) is close to one end of the bolt rod (201) and is in close contact with one end of the second washer (104) away from the expansion member; The third washer (203) is provided with a back-stop pressure tooth (204) at one end close to the second washer (104), and the second washer (104) is provided with a back-stop tooth groove (105) matching the shape of the back-stop pressure tooth (204) at one end close to the third washer (203); The anti-return pressure tooth (204) includes a gently sloping convex surface (401) and a steeply sloping convex surface (402); the anti-return tooth groove (105) includes a gently sloping groove surface (501) and a steeply sloping groove surface (502); the gently sloping convex surface (401) and the gently sloping groove surface (501) are close to each other, and the steeply sloping convex surface (402) and the steeply sloping groove surface (502) are close to each other.

2. The pressed tooth petal nut according to claim 1, characterized in that: There are a plurality of anti-return pressure teeth (204), and the anti-return pressure teeth (204) are distributed in a ring array; there are a plurality of anti-return tooth grooves (105), and the anti-return tooth grooves (105) are distributed in a ring array.

3. The pressed tooth petal nut according to claim 1, characterized in that: The expansion member comprises a plurality of expansion sheets (103) distributed in a ring array.

4. The pressed tooth petal nut according to claim 3, characterized in that: The middle portion of the expansion sheet (103) is bent in a direction away from the axis of the bolt rod (201).

5. The pressed tooth petal nut according to claim 1, characterized in that: A hexagonal bolt head (202) is fixed to one end of the third washer (203) away from the bolt rod (201).

6. The pressed tooth petal nut according to claim 1, characterized in that: The surface area of ​​the third gasket (203) close to the second gasket (104) is greater than the surface area of ​​the second gasket (104) close to the third gasket (203).

7. The pressed tooth petal nut according to any one of claims 1, 3 and 4, characterized in that: The strength of the middle part of the expansion piece is weaker than that of the end parts.

8. The pressed tooth petal nut according to claim 1, characterized in that: The angle between the gently sloping groove surface (501) and the steeply sloping groove surface (502) is less than 90°, and the angle between the gently sloping convex surface (401) and the steeply sloping convex surface (402) is less than 90°.

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