High-strength self-locking bolt for rotary blade

Abstract

The utility model discloses a high-strength self-locking bolt for a rotary blade. The high-strength self-locking bolt comprises a bolt body, a ratchet ring, the rotary blade, a nut, a ratchet groove and a threaded section. A ratchet ring which is annularly distributed is arranged on the bottom surface of the head part of the bolt; the ratchet ring consists of a plurality of ratchets which are inclined in one direction; a rotary blade and a nut are installed on the bolt, a ratchet groove is formed in the installation face of the rotary blade, the position of the ratchet groove corresponds to the position of the ratchet ring, and a limiting face opposite to the inclination direction of the ratchets is arranged in the ratchet groove. When the bolt is screwed tightly, the ratchet ring is meshed with the limiting face of the ratchet groove, and reverse rotation of the bolt is limited. The outer wall of the bolt is provided with a threaded section, the included angle between the inclined face of the ratchet and the axial section is an acute angle, the reverse limiting face of the ratchet is a vertical face or an obtuse-angle face, the ratchet of the ratchet ring is in a triangular shape, and the width of the tooth crest is smaller than that of the tooth root. And long-acting locking under the vibration working condition is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of bolt, especially the technical field of high -strength self -locking bolt of rotary blade. BACKGROUND

[0002] Rotary blade, a kind of widely used mechanical blade in agricultural cultivation, its main function is to break and turn over soil by high speed rotation, and this kind of blade can effectively mix and level land for sowing and plant growth.

[0003] At present, rotary blade is usually installed on blade shaft by bolt, and when rotary blade works in soil containing more moisture, its bolt is easily corroded due to the influence of external moisture, thereby causing the service life to be reduced.

[0004] To solve the problems raised in the above-mentioned technology, for example, application No. CN202122385915.7 discloses a new corrosion-resistant bolt, which comprises a main unit, the main unit is composed of a rod, an external thread and a bolt head, the rod is fixedly connected with the bolt head, a protection unit is arranged above the main unit, the protection unit is composed of a sealing sheet, a deformable metal piece, a protective cover, a through hole, a gradual change part and a containing groove, the sealing sheet is fixedly connected with the bolt head, the sealing sheet is in the shape of a circular ring, the deformable metal piece is fixedly connected with the bolt head and located in the middle of the bolt head, the protection unit is provided, which can provide good protection for the bolt, avoid corrosion of the bolt and prolong the service life, and the operation is simple and convenient to use.

[0005] Although the above structure can avoid corrosion of the bolt, it lacks an anti-theft structure, which increases the risk of theft of the bolt and increases the replacement cost.

[0006] To solve the problems raised in the above-mentioned technology, for example, application No. CN202222112413.1 discloses a high-strength corrosion-resistant bolt, which comprises a hexagonal end, the hexagonal end is provided with a cavity inside, the inner wall of the cavity is provided with a driving groove, a through hole connected with the cavity is formed in the side wall of the hexagonal end, a stud is installed in the through hole, the stud extends to the inside and outside of the hexagonal end at both ends respectively, a connecting piece is arranged in the cavity, the connecting piece is fixedly connected with the inner wall of the cavity through a spring, the connecting piece is clamped with the end of the stud, a pin is further connected with one side of the connecting piece, the pin penetrates the inner wall of the cavity and extends to the outside of the hexagonal end, the stud can be rotated by rotating the hexagonal end, the installation of the bolt is realized, the installation surface gradually extrudes the pin during the installation process of the bolt, when the hexagonal end contacts the installation surface, the connecting piece and the end of the stud can be separated, at this time, rotating the hexagonal end will not drive the stud to rotate, so that the anti-theft function can be realized.

[0007] However, the above structure still has the following defects:

[0008] As the core component of agricultural machinery, the rotary tiller blade long-term withstands high-frequency vibration and impact load caused by soil cutting. The connecting bolt of the blade and the shaft needs to meet the dual requirements of anti-loosening and high strength. However, the above bolt structure is prone to loosening or breaking under the action of alternating stress in this working condition, resulting in blade falling off, operation interruption, and even safety accidents. SUMMARY

[0009] The utility model discloses a rotary tiller high-strength self-locking bolt, which can realize long-term locking under vibration working condition without external auxiliary parts, and significantly improve the torsional rupture resistance by optimizing the load distribution and local reinforcement, and adapt to the harsh working environment of rotary tiller and other agricultural machinery.

[0010] To achieve the above object, the utility model provides a rotary tiller high-strength self-locking bolt, which comprises a bolt, a ratchet ring, a rotary tiller, a nut, a ratchet groove and a threaded segment. The bottom surface of the head of the bolt is provided with a ratchet ring distributed in a ring shape. The ratchet ring is composed of a plurality of one-way inclined ratchets. The bolt is provided with a rotary tiller and a nut. The mounting surface of the rotary tiller is provided with a ratchet groove. The ratchet groove corresponds in position to the ratchet ring. A limiting surface opposite to the inclined direction of the ratchet is arranged in the ratchet groove. When the bolt is tightened, the ratchet ring is engaged with the limiting surface of the ratchet groove to limit the reverse rotation of the bolt. The outer wall of the bolt is provided with a threaded segment.

[0011] Preferably, the included angle between the inclined surface of the ratchet and the axial section is an acute angle, and the reverse limiting surface is a vertical surface or an obtuse surface.

[0012] Preferably, the ratchet of the ratchet ring is triangular in shape, and the tooth top width is smaller than the tooth root width.

[0013] Preferably, a reverse ratchet matched with the ratchet ring is arranged in the ratchet groove to form a bidirectional engagement structure.

[0014] Preferably, the bottom of the ratchet groove is provided with an elastic support layer, which is a metal sheet or a rubber pad.

[0015] Preferably, the root of the ratchet is provided with a U-shaped elastic notch, so that the ratchet has radial elastic deformation capability.

[0016] Preferably, the thread of the threaded segment is a gradually changing asymmetric structure. The thread height near the head of the bolt is greater than the thread height at the end, and the tooth root width increases synchronously with the decrease of the thread height.

[0017] Preferably, a reinforcing core is arranged in the bolt rod in the axial direction, and the reinforcing core has a polygonal or star-shaped cross section, and the outer wall of the reinforcing core is connected with the inner wall of the bolt rod by radial reinforcing ribs.

[0018] The utility model discloses the beneficial effect of:

[0019] 1. the utility model discloses a ratchet ring and ratchet groove's cooperation under, can realize the long -term locking under the vibration condition, first bolt passes through the mounting hole on the rotary tiller, then when the nut is screwed into the bolt, the ratchet ring of bolt head contacts the ratchet groove of rotary tiller mounting surface, during the process of screwing, the ratchet inclined surface allows clockwise rotation (no resistance), when counterclockwise rotation, the ratchet perpendicular surface is stuck with the groove wall, when the bolt is screwed to the preset torque, the ratchet tip is embedded in the ratchet groove, forms mechanical engagement, and the bottom of the tooth groove is equipped with elastic support layer, and its pressure deformation provides continuous axial pressure, enhances the ratchet meshing tightness, thereby under the premise that no external auxiliary part, realize the long -term locking under the vibration condition,

[0020] 2. the utility model discloses a high thread tooth decrement and tooth root widening, make the load even transmission from the bolt head to the end, reduce the risk of root fracture, and the rod portion of the bolt is equipped with a reinforcing core to improve the torsional rupture capacity, and the radial reinforcing ribs prevent the reinforcing core from peeling off the rod body, further improve the strength of the bolt as a whole, thereby prolonging the service life of the bolt. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a front view of a high-strength self-locking bolt of a rotary tiller of the utility model;

[0022] Figure 2 It is a ratchet ring enlarged schematic view of a high-strength self-locking bolt of a rotary tiller of the utility model;

[0023] Figure 3 It is a ratchet groove schematic view of a high-strength self-locking bolt of a rotary tiller of the utility model;

[0024] Figure 4 It is a sectional view of a high-strength self-locking bolt of a rotary tiller of the utility model;

[0025] In the drawing: 1-bolt, 101-ratchet ring, 2-rotary tiller, 3-nut, 201-ratchet groove, 4-thread segment, 2011-reverse ratchet, 5-elastic support layer, 1011-U-shaped elastic notch, 102-reinforcing core, 103-reinforcing rib. DETAILED DESCRIPTION

[0026] Reference Figures 1 to 4The utility model discloses a high -strength self -locking bolt of rotary plough blade, including bolt 1, ratchet ring 101, rotary plough blade 2, nut 3, ratchet groove 201 and threaded section 4, the bottom surface of the head of bolt 1 is equipped with annular distribution's ratchet ring 101, ratchet ring 101 is by a plurality of one -way inclined ratchet, the bolt 1 is installed with rotary plough blade 2 and nut 3, the mounting surface of rotary plough blade 2 is equipped with ratchet groove 201, ratchet groove 201 and ratchet ring 101 position correspond, be equipped with the limiting surface with the ratchet inclined direction opposite in ratchet groove 201, when bolt 1 is screwed, the limiting surface of ratchet ring 101 and ratchet groove 201 engages, and the bolt 1 reverse rotation is limited, the outer wall of bolt 1 is equipped with threaded section 4.

[0027] Refer to Figure 2 And Figure 3 The included angle of the inclined surface of the ratchet and the axial section is an acute angle, and the reverse limiting surface is a vertical surface or an obtuse surface. When the bolt 1 rotates counterclockwise, the ratchet vertical surface and the groove wall form a rigid block, preventing loosening, thereby realizing self-locking.

[0028] Refer to Figure 2 The ratchet of the ratchet ring 101 is triangular, and the tooth top width is less than the tooth root width. The sharp tooth top of the ratchet forms a point contact with the groove wall, and the local pressure is high, so it is not easy to slip in a vibration environment.

[0029] Refer to Figure 3 The ratchet groove 201 is provided with a reverse ratchet 2011 matched with the ratchet ring 101, forming a bidirectional meshing structure. Through the bidirectional meshing structure, the connection firmness between the bolt 1 and the rotary plough blade 2 can be further improved, and the loosening effect is achieved.

[0030] Refer to Figure 3 The bottom of the tooth groove 201 is provided with an elastic support layer 5, which is a metal sheet or a rubber pad. Through the setting of the elastic support layer 5, the locking force can be maintained by compensating for the wear of the ratchet through elastic deformation in long-term use.

[0031] Refer to Figure 2 The root of the ratchet is provided with a U-shaped elastic notch 1011, so that the ratchet has radial elastic deformation capability. By providing the U-shaped notch 1011 at the root of the ratchet, the tooth body has elasticity. When tightened, the tooth body deforms to fit the groove wall, and adapts to the uneven surface.

[0032] Refer to Figure 1 The thread of the threaded section 4 is a gradually changing asymmetric structure. The thread height near the head of the bolt 1 is greater than the thread height at the end, and the tooth root width increases synchronously with the decrease of the tooth height, so that the load is uniformly transmitted from the head to the end of the bolt 1, reducing the risk of root fracture (the asymmetric thread type adapts to the dynamic load distribution of the vibration working condition of the rotary plough blade 2).

[0033] Referring to Figure 4 The rod body of the bolt 1 is internally provided with a reinforcing core column 102 in the axial direction, the reinforcing core column 102 is polygonal or star-shaped in cross section, the outer wall of the reinforcing core column 102 is connected with the inner wall of the rod body of the bolt 1 through radial reinforcing ribs 103, the reinforcing core column 102 improves the torsional rupture resistance of the bolt 1, the radial reinforcing ribs 103 prevent the reinforcing core column 102 from peeling off the rod body, further improve the strength of the whole bolt 1, and thus prolong the service life of the bolt 1.

[0034] The working process of the utility model is as follows:

[0035] In the working process of the high-strength self-locking bolt for the rotary tillage blade, firstly, the bolt 1 is passed through the mounting hole on the rotary tillage blade 2, then the nut 3 is screwed into the bolt 1, the ratchet ring 101 on the head of the bolt 1 is in contact with the ratchet groove 201 on the mounting surface of the rotary tillage blade 2, in the process of screwing, the ratchet inclined surface allows clockwise rotation (without resistance), when counterclockwise rotation, the ratchet vertical surface is locked with the groove wall, when the bolt 1 is screwed to the preset torque, the ratchet tip is embedded in the ratchet groove 201, mechanical engagement is formed, at the same time, the bottom of the ratchet groove 201 is provided with an elastic supporting layer 5, the continuous axial pressure provided by the pressure deformation of the elastic supporting layer 5 enhances the tightness of the ratchet engagement, so that long-term locking under vibration conditions is realized without external auxiliary parts.

[0036] By decreasing the height of the thread tooth and widening the root, the load is uniformly transmitted from the bolt head to the end, the risk of root fracture is reduced, at the same time, the reinforcing core column 102 is arranged in the rod of the bolt 1 to improve the torsional rupture resistance, the radial reinforcing ribs 103 prevent the reinforcing core column 102 from peeling off the rod body, further improve the strength of the whole bolt 1, and thus prolong the service life of the bolt 1.

[0037] The above embodiments are illustrative of the utility model, but not limiting of the utility model, any simple transformation of the utility model belongs to the protection scope of the utility model.

Claims

1. A high-strength self-locking bolt for rotary tillers, characterized in that: The utility model relates to a bolt (1), ratchet ring (101), rotary blade (2), nut (3), ratchet groove (201) and threaded section (4) are included, the bottom surface of the head of bolt (1) is equipped with annular distribution ratchet ring (101), ratchet ring (101) is composed of a plurality of one-way inclined ratchet, rotary blade (2) and nut (3) are installed on bolt (1), the mounting surface of rotary blade (2) is equipped with ratchet groove (201), ratchet groove (201) and ratchet ring (101) position correspond, ratchet groove (201) is equipped with the limiting surface opposite with the inclined direction of ratchet, when bolt (1) is screwed, ratchet ring (101) and the limiting surface of ratchet groove (201) mesh, limit bolt (1) reverse rotation, the outer wall of bolt (1) is equipped with threaded section (4).

2. The high-strength self-locking bolt for a rotary blade according to claim 1, wherein: The included angle between the inclined surface of the ratchet and the axial section is an acute angle, and the reverse limiting surface is a vertical surface or an obtuse surface.

3. The high-strength self-locking bolt for a rotary blade according to claim 1, wherein: The ratchet shape of the ratchet ring (101) is triangular, and the tooth top width is less than the tooth root width.

4. The high-strength self-locking bolt for a rotary blade according to claim 1, wherein: The ratchet groove (201) is equipped with the reverse ratchet (2011) matched with the ratchet ring (101) in, and a bidirectional meshing structure is formed.

5. The high-strength self-locking bolt for a rotary blade according to claim 1, wherein: The bottom of the tooth groove (201) is equipped with an elastic support layer (5), and the elastic support layer (5) is a metal sheet or a rubber pad.

6. A high-strength self-locking bolt for a rotary blade as set forth in claim 1, characterized in that: The root of the ratchet is equipped with a U-shaped elastic notch (1011), so that the ratchet has radial elastic deformation capacity.

7. The high-strength self-locking bolt for a rotary blade according to claim 1, wherein: The thread tooth type of the threaded section (4) is a gradually changing asymmetric structure, and the thread tooth height near the head of the bolt (1) is greater than the end thread tooth height, and the tooth root width increases synchronously with the decrease of the tooth height.

8. The high-strength self-locking bolt for a rotary blade according to claim 1, wherein: The rod body of the bolt (1) is equipped with a reinforcing core column (102) in the axial direction, the cross section of the reinforcing core column (102) is a polygon or a star, and the outer wall thereof is connected with the inner wall of the rod body of the bolt (1) through radial reinforcing ribs (103).

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