Mechanical automatic opening and closing lifting hook with self-locking function

Abstract

The utility model discloses a self-locking mechanical automatic opening and closing lifting hook which comprises a lifting hook protective cover, and a lifting hook eccentric assembly is rotationally arranged in the lifting hook protective cover and used for hanging goods. A pressing block assembly is rotationally arranged on the top side of the interior of the lifting hook protective cover, a clamping plate assembly is rotationally arranged in the position, between the pressing block assembly and the lifting hook eccentric assembly, of the interior of the lifting hook protective cover, and the clamping plate assembly clamps and releases the lifting hook eccentric assembly through the pressing block assembly; and an extension spring assembly is arranged on one side of the lifting hook eccentric assembly in the lifting hook protective cover and is used for assisting the lifting hook eccentric assembly to be released and opened. According to the mechanical automatic opening and closing lifting hook with the self-locking function, the self-locking function and the automatic opening and closing function are integrated, manual operation is omitted, a worker does not need to get close to a load, and the safety performance of lifting equipment is improved; and a pure mechanical structure is adopted, electrical participation is avoided, the structure is simple, the reliability is high, and the self-unloading hook is suitable for various occasions needing self-unloading hooks.

Description

TECHNICAL FIELD

[0001] The utility model relates to hoisting equipment technical field especially relates to a take up mechanical automatic opening and closing hook with self locking. BACKGROUND

[0002] The hook is the most widely used object taking device in hoisting equipment, especially in the occasion needing self-unloading hook, the hoisting does not use sling, but the hook directly contacts the lifting appliance, due to the particularity of the structure of the lifting appliance, personnel is inconvenient to approach and operate, the self-unloading hook on the market at present only opens and closes the hook by load, is only suitable for small and light objects, and does not have locking function, and there is a great accidental risk.

[0003] Therefore, how to make the hook have automatic hooking, safe locking and automatic load release becomes an urgent problem to be solved. CONTENT OF THE UTILITY MODEL

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is expected to provide a take up mechanical automatic opening and closing hook with self locking.

[0005] The utility model provides a take up mechanical automatic opening and closing hook with self locking, including the hook protection casing, the inside rotation of hook protection casing is provided with the hook eccentric component, is used for hanging goods, the top side rotation of the inside of hook protection casing is provided with the pressing block component, the inside of hook protection casing is located between the pressing block component and the rotation of the hook eccentric component is provided with the clamping plate component, the clamping plate component is released through the pressing block component realizes the clamping of the hook eccentric component, the inside of hook protection casing is located on one side of the hook eccentric component and is provided with the stretch spring component, is used for assisting the hook eccentric component release opening.

[0006] Further, the hook protection casing includes two parallelly arranged first guard plates and second guard plates, a connecting plate is fixedly arranged on one side surface between the first guard plates and the second guard plates, for fixedly connecting the first guard plates and the second guard plates.

[0007] Further, the hook eccentric component includes a weight and a hook, wherein,

[0008] The hook is arranged at the bottom of the weight, and a first U-shaped notch is arranged at the top end of the hook.

[0009] The heavy hammer comprises a sector plate arranged parallel to the first guard plate, a connecting block integrally formed at the bottom of one side of the sector plate close to the connecting plate and arranged perpendicularly between the side of the sector plate; the bottom of the sector plate is fixedly arranged inside the first U-shaped notch, and the end of the connecting block away from the sector plate penetrates out of the first U-shaped notch; the both sides of the plate surface of the sector plate are fixedly arranged with counterweight plates above the hook; a plurality of tooth grooves are arranged on the arc surface of the sector plate along the length direction thereof; a second U-shaped notch is arranged on the end surface of the connecting block away from the sector plate; the angular bisector of the sector plate and the axis of the hook neck of the hook are arranged on the same straight line.

[0010] The hook and the heavy hammer are rotatably arranged on the lower side between the first guard plate and the second guard plate through a pin shaft assembly, the bottom of the hook penetrates out of the bottom of the hook guard cover, and the hook is convenient for hooking goods.

[0011] Further, a U-shaped hook limiting plate is fixedly arranged on the inner side wall surface of the first guard plate at the lower part of the side away from the connecting plate, and is used for limiting the hook in the locked and released states respectively.

[0012] Further, the tension spring assembly comprises a first fixed rod, a second fixed rod and a tension spring; wherein,

[0013] The first fixed rod is fixedly arranged inside the second U-shaped notch, and the first fixed rod is arranged perpendicularly to the plate surface of the sector plate;

[0014] The second fixed rod is arranged between the first guard plate and the second guard plate and at the side of the clamping plate assembly close to the connecting plate, and the second fixed rod is arranged parallel to the first fixed rod;

[0015] The tension spring is arranged with one end hooked on the first fixed rod and the other end hooked on the second fixed rod.

[0016] Further, the clamping plate assembly comprises a third fixed rod, a clamping plate, a fourth fixed rod, a torsion spring limiting plate and a torsion spring; wherein,

[0017] The third fixed rod is fixedly arranged between the first guard plate and the second guard plate, and the third fixed rod is arranged perpendicularly to the first guard plate;

[0018] The clamping plate is sleeved on the circumferential outer side of the third fixed rod corresponding to the rotation of the sector plate, a tooth is integrally formed on one end of the clamping plate close to the sector plate, and the tooth can be clamped into the inside of the tooth groove; an angle plate is integrally formed on the end of the clamping plate away from the tooth, and a clamping groove is arranged on the side of the angle plate away from the tension spring and between the first and second protective plates.

[0019] The fourth fixed rod is arranged between the first and second protective plates corresponding to the clamping groove, and is arranged in parallel with the third fixed rod.

[0020] The torsion spring limiting plate is arranged on the side away from the connecting plate between the first and second protective plates corresponding to the clamping plate, and a through hole is arranged on the plate surface of the torsion spring limiting plate.

[0021] The torsion spring is sleeved on the circumferential wall surface of the fourth fixed rod, one end of the torsion spring abuts against the side surface of the clamping plate, and the other end of the torsion spring passes through the through hole.

[0022] Further, the pressing block assembly comprises a U-shaped pulling plate, the opening end of the U-shaped pulling plate is sleeved on the top outer side of the first and second protective plates, a connecting shaft is arranged through the opening end of the U-shaped pulling plate, the top end of the first protective plate and the top end of the second protective plate, the connecting shaft is fixedly sleeved on the circumferential outer side between the first and second protective plates, the first and second protective plates are rotatably connected with the connecting shaft, and the U-shaped pulling plate is fixedly connected with the connecting shaft.

[0023] Further, the connecting shaft is arranged perpendicularly to the plate surfaces of the U-shaped pulling plate, the first protective plate and the second protective plate.

[0024] Compared with the prior art, the utility model has the advantages that:

[0025] The utility model discloses a self-locking mechanical automatic opening and closing lifting hook, and the lifting hook and the weight form an eccentric structure, so that the specification of the tension spring is greatly reduced, the opening difficulty problem caused by the large spring stiffness is avoided, the locking function is added to the lifting hook in addition to the opening function, when lifting the weight, the lifting hook is in the locking state, even if the weight is loosened, the lifting hook will not be opened, the safety of operation is ensured, and the lifting hook is only continued to fall, the lifting hook is inclined as a whole, the tooth on the clamping plate is separated from the tooth groove under the action of the pressing block, the lifting hook is opened, and the lifting operation can be completed by lifting upward.

[0026] The utility model discloses a take self -locking mechanical automatic open -close lifting hook, and its opening and closing completely adopt mechanical structure, and no electricity participates, and the operation is simple, and the reliability is high, and the structure adopts alloy steel to make, and is solid durable, and the operator can independently lift the load, and does not need other assisting personnel, and the self -locking and automatic open hook function of lifting hook ensures locking and releasing the load, greatly reduces the accidental risk, prevents the safety accident.

[0027] It should be understood that the content described in the utility model content part is not intended to limit the key or important features of the embodiments of the utility model, nor to limit the scope of the utility model.

[0028] Other features of the utility model will become easy to understand through the following description. BRIEF DESCRIPTION OF DRAWINGS

[0029] Other features, objects and advantages of the utility model will become more apparent by reading the following detailed description of non - limiting embodiments made with reference to the following drawings:

[0030] Fig. 1 It is a side structure schematic drawing of a take self -locking mechanical automatic open -close lifting hook provided for the utility model embodiment;

[0031] Fig. 2 It is the structure schematic drawing of another side of a take self -locking mechanical automatic open -close lifting hook;

[0032] Fig. 3 It is the structure schematic drawing of the inside one side of a take self -locking mechanical automatic open -close lifting hook;

[0033] Fig. 4 It is the structure schematic drawing of the inside another side of a take self -locking mechanical automatic open -close lifting hook;

[0034] Fig. 5 It is the structure schematic drawing of the assembly of heavy hammer and tensile spring assembly;

[0035] Fig. 6 It is the structure schematic drawing of the closed locking state of lifting hook;

[0036] Fig. 7 It is the structure schematic drawing of the open release state of lifting hook;

[0037] Marked number in drawing: 1, lifting hook shield;11, first baffle;12, second baffle;13, connecting plate;

[0038] 2, lifting hook eccentric assembly;21, lifting hook;211, first U -shaped gap;22, heavy hammer;221, sector plate;222, connecting block;223, counterweight;224, tooth groove;225, second U -shaped gap;23, pin shaft assembly;

[0039] 3, lifting hook limit plate;

[0040] 4. A tension spring assembly; 41. A first fixed rod; 42. A second fixed rod; 43. A tension spring;

[0041] 5. A clamping plate assembly; 51. A third fixed rod; 52. A clamping plate; 53. A fourth fixed rod; 54. A torsion spring limiting plate; 55. A torsion spring; 56. A tooth; 57. An angle plate; 58. A clamping slot; 59. A through hole;

[0042] 6. A pressing block assembly; 61. A U-shaped pull plate; 62. A connecting shaft; 63. A pressing block. DETAILED DESCRIPTION

[0043] The utility model will be explained in further detail below by combining with the drawings and embodiments. It can be understood that the specific embodiments described here are only used to explain the related utility model, and are not limited to the utility model. In addition, it should be noted that only the parts related to the utility model are shown in the drawings for the convenience of description.

[0044] It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict. The utility model will be explained in detail below by combining with the drawings and embodiments.

[0045] Please refer to Figs. 1-7 The embodiment of the utility model provides a mechanical automatic opening and closing lifting hook with self-locking, which comprises a lifting hook cover 1, a lifting hook eccentric assembly 2 is rotationally arranged in the inside of the lifting hook cover 1, and is used for hanging goods;

[0046] Preferably, the lifting hook cover 1 comprises two first guard plates 11 and second guard plates 12 arranged in parallel, a connecting plate 13 is fixedly arranged on one side surface between the first guard plate 11 and the second guard plate 12, and is used for fixedly connecting the first guard plate 11 and the second guard plate 12; wherein the connecting plate 13 is perpendicular to the first guard plate 11 and the second guard plate 12, and the first guard plate 11, the second guard plate 12 and the connecting plate 13 form a hollow cover, which is used for installing the lifting hook and other related structures.

[0047] In a preferred embodiment, the lifting hook eccentric assembly 2 comprises a weight 22 and a lifting hook 21; wherein,

[0048] The hook neck of the lifting hook 21 is fixedly arranged at the bottom of the weight 22, and a first U-shaped notch 211 is arranged on the hook neck of the lifting hook 21, so as to provide an assembly space for the installation of the weight 22;

[0049] The heavy hammer 22 includes a fan-shaped plate 221 arranged parallel to the first guard plate 11, and a connecting block 222 integrally formed at the bottom of the side of the fan-shaped plate 221 away from the connecting plate 13, which is arranged perpendicularly between the side of the fan-shaped plate 221 and the connecting block 222; the connecting block 222 is arranged to connect the tension spring 43, so that the heavy hammer 22 and the hook 21 can quickly rotate to the released open state after being released from the restriction of the clamping plate assembly 5.

[0050] The bottom of the fan-shaped plate 221 is fixedly arranged inside the first U-shaped notch 211, and the end of the connecting block 222 away from the fan-shaped plate 221 is arranged to pass through the first U-shaped notch 211, so that the connection between the tension spring 43 and the fan-shaped plate 211 is not interfered; the two sides of the plate surface of the fan-shaped plate 221 are fixedly arranged with counterweight plates 223 above the hook 21, so that the hook 21 and the fan-shaped plate 221 as a whole automatically rotate downward in the natural state, and the upper part (i.e. the fan-shaped plate 221 part) is heavier than the lower part (i.e. the hook 21 part), thereby realizing the function of automatic downward rotation with the pin shaft assembly 23 as the center; a plurality of tooth grooves 224 are arranged on the arc surface of the fan-shaped plate 221 along the length direction thereof.

[0051] A second U-shaped notch 225 is arranged on the end surface of the connecting block 222 away from the fan-shaped plate 221 to provide assembly space for the installation of the tension spring 43; the angle bisector of the fan-shaped plate 221 and the axis of the hook neck of the hook 21 are arranged on the same straight line.

[0052] The hook 21 and the heavy hammer 22 are arranged on the lower side between the first guard plate 11 and the second guard plate 12 through the rotation of the pin shaft assembly 23, and the bottom of the hook 21 is arranged to pass through the bottom of the hook guard 1, so as to facilitate the hooking of goods; wherein the pin shaft assembly 23 is arranged perpendicularly to the first guard plate 11 and the second guard plate 12.

[0053] In a preferred embodiment, a U-shaped hook limiting plate 3 is fixedly arranged on the inner side wall surface of the first guard plate 11 at the lower part of the side away from the connecting plate 13, for respectively limiting the hook 21 in the locked and released states; that is, when the hook 21 and the heavy hammer 22 rotate counterclockwise, which is the releasing and opening process of the hook 21, the side of the fan-shaped plate 221 away from the connecting plate 13 abuts against the top of the hook limiting plate 3, thereby avoiding the opening of the hook 21 being too large and limiting the opening of the hook 21; when the hook 21 and the fan-shaped plate 221 rotate clockwise, which is the locking process of the hook 21, the hooking end of the hook 21 abuts against the bottom of the hook limiting plate 3, thereby limiting the hook 21 and forming a closed state with the hooking part of the hook 21, and at the same time, cooperating with the clamping state between the clamping plate assembly 5 and the fan-shaped plate 221, to improve the safety during the hoisting of goods.

[0054] The inside of the hook cover 1 is provided with a tension spring assembly 4 on the side of the hook eccentric assembly 2 close to the connecting plate 13, which is used to assist the hook eccentric assembly 2 to release and open.

[0055] In a preferred embodiment, the tension spring assembly 4 comprises a first fixed rod 41, a second fixed rod 42 and a tension spring 43; wherein,

[0056] The first fixed rod 41 is fixedly arranged in the inside of the second U-shaped gap 225, and is arranged perpendicular to the plate surface of the sector plate 221;

[0057] The second fixed rod 42 is arranged between the first guard plate 11 and the second guard plate 12 and on the side of the clamping plate assembly 5 close to the connecting plate 13, and is arranged parallel to the first fixed rod 41; wherein, the second fixed rod 42 is arranged perpendicular to the first guard plate 11 and the second guard plate 12;

[0058] The tension spring 43 is arranged on the first fixed rod 41 at one end and on the second fixed rod 42 at the other end, and is used to assist the whole counter-clockwise rotation of the weight 22 and the hook 21, that is, the releasing and opening process of the hook 21.

[0059] The top side of the inside of the hook cover 1 is rotatably arranged with a pressing block assembly 6, and the inside of the hook cover 1 is rotatably arranged with a clamping plate assembly 5 between the pressing block assembly 6 and the hook eccentric assembly 2, and the clamping plate assembly 5 realizes clamping and releasing of the hook eccentric assembly 2 through the pressing block assembly 6;

[0060] In a preferred embodiment, the clamping plate assembly 5 comprises a third fixed rod 51, a clamping plate 52, a fourth fixed rod 53, a torsion spring limiting plate 54 and a torsion spring 55; wherein,

[0061] The third fixed rod 51 is fixedly arranged between the first guard plate 11 and the second guard plate 12, and is arranged perpendicular to the first guard plate 11;

[0062] The clamping plate 52 is sleeved on the circumferential outside of the third fixed rod 51 corresponding to the rotation of the sector plate 221, and the end of the clamping plate 52 close to the sector plate 221 is integrally formed with a tooth 56 corresponding to the gear groove 224, and the tooth 56 can be clamped into the inside of the gear groove 224, thereby locking and limiting the sector plate 221 and the hook 21, so that they are in a locked state;

[0063] The end of the clamping plate 52 away from the tooth 56 is integrally formed with an angular plate 57, and a clamping groove 58 is arranged between the angular plate 57 and the clamping plate 52 away from the tension spring 43;

[0064] The fourth fixed rod 53 is fixedly arranged between the first guard plate 11 and the second guard plate 12 corresponding to the clamping groove 58, and is arranged parallel to the third fixed rod 51.

[0065] That is, when the clamping plate 52 rotates counterclockwise, the clamping plate 52 is limited in rotation by abutting against the fourth fixed rod 53 through the clamping groove 58, so as to realize the clamping cooperation between the teeth 56 and the tooth groove 224.

[0066] The torsional spring limiting plate 54 is arranged between the first guard plate 11 and the second guard plate 12 away from the connecting plate 13, and the torsional spring limiting plate 54 is arranged on the side of the clamping plate 52 away from the connecting plate 13; the through hole 59 is arranged on the surface of the torsional spring limiting plate 54.

[0067] The torsional spring 55 is sleeved on the circumferential wall surface of the fourth fixed rod 53, one end of the torsional spring 55 abuts against the side surface of the clamping plate 52, and the other end of the torsional spring 55 passes through the through hole 59.

[0068] The torsional spring 55 is used for applying a downward pressure to one end of the teeth 56 on the clamping plate 52, so that the clamping plate 52 is clamped with the corresponding tooth groove 224.

[0069] In a preferred embodiment, the pressing block assembly 6 comprises a U-shaped pull plate 61, the opening end of the U-shaped pull plate 61 is sleeved on the top outer side of the first guard plate 11 and the second guard plate 12, the connecting shaft 62 is arranged through the opening end of the U-shaped pull plate 61, the top end of the first guard plate 11 and the top end of the second guard plate 12, the connecting shaft 62 is fixedly sleeved on the circumferential outer side between the first guard plate 11 and the second guard plate 12, the pressing block 63 is arranged on the connecting shaft 62, the bottom surface of the pressing block 63 is provided with a third U-shaped opening, the third U-shaped opening can avoid mutual friction with the angular plate 57 on the clamping plate 52 below during hoisting; the first guard plate 11 and the second guard plate 12 are rotatably connected with the connecting shaft 62; the U-shaped pull plate 61 is fixedly connected with the connecting shaft 62.

[0070] In a preferred embodiment, the connecting shaft 62 is perpendicular to the plate surface of the U-shaped pull plate 61, the first guard plate 11 and the second guard plate 12.

[0071] The working principle of the utility model:

[0072] When the hook 21 does not hook the heavy object, the hook head of the hook 21 is in a horizontal state under the joint action of the tensile spring 43 and the weight 22, and the corresponding weight 22 is in a position away from the clamping plate 52, that is, the hook 21 is in a released opening state at this time;

[0073] When the hook 21 hoists the heavy object, the weight 22 and the hook 21 rotate clockwise, the hook head of the hook 21 is limited by the hook limiting plate 3, the upper tooth groove 224 of the weight 22 pushes away the clamping plate 52, and the rotation angle is determined by the size of the hoisted heavy object; at this time, the tensile spring 43 is elongated relative to the opening state of the hook 21, and the tension on the hook 21 is increased; the pressure of the torsional spring 55 on the clamping plate 52 makes the clamping plate 52 keep being pressed downward at the tooth groove 224 of the weight 22.

[0074] When the hook 21 is lowered, the hook head of the hook 21 is separated from the weight, under the action of the pulling force of the tension spring 43 and the eccentric force of the weight 22, the weight 22 hooks the clamping plate 52, so that the hook 21 is locked in the current position, realizing the locking function; when the hook 21 continues to descend, the hook guard 1 below abuts against the weight hook handle, at this time the hook guard 1 and the hook 21 as a whole are inclined, the pressing block 63 rotates relative to the weight 22 and the clamping plate 52, so that the clamping plate 52 is separated from the tooth groove 224 of the weight 22, and the hook 21 is opened under the joint action of the weight 22 and the tension spring 43.

[0075] In summary, the hook of the present application integrates the functions of self-locking and automatic opening and closing, eliminates manual operation, does not need personnel to approach the load, improves the safety performance of the hoisting equipment; and adopts a pure mechanical structure without electrical participation, which is simple in structure and high in reliability, and is suitable for various occasions requiring self-unloading hooks.

[0076] In the description of the present application, the terms "connection", "installation", "fixation" and the like should be understood in a broad sense, for example, "connection" can be fixed connection, can also be detachable connection, or integral connection; can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0077] In the description of the present application, the terms "one embodiment", "some embodiments" and the like mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0078] The above is only the preferred embodiment of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A self-locking mechanical automatic opening and closing hook, characterized in that, The hook shield is internally rotatably provided with a hook eccentric assembly for hanging goods; a pressing block assembly is rotatably arranged on the top side of the inside of the hook shield; a clamping plate assembly is rotatably arranged between the pressing block assembly and the hook eccentric assembly in the inside of the hook shield, and the clamping plate assembly is clamped and released to the hook eccentric assembly through the pressing block assembly; a tension spring assembly is arranged on one side of the inside of the hook shield between the hook eccentric assembly, and is used for assisting the hook eccentric assembly to be released and opened.

2. The self-locking mechanical automatic opening and closing hook according to claim 1, characterized in that, The hook shield comprises two first and second shielding plates arranged in parallel, and a connecting plate fixedly arranged on one side between the first and second shielding plates, and used for fixedly connecting the first and second shielding plates.

3. The self-locking mechanical automatic opening and closing hook according to claim 2, characterized in that, The hook eccentric assembly comprises a weight and a hook. The hook is arranged at the bottom of the weight, and a first U-shaped notch is arranged at the top end of the hook. The weight comprises a fan-shaped plate arranged in parallel to the first shielding plate, a connecting block integrally formed at the bottom of one side of the fan-shaped plate close to the connecting plate, and the connecting block is arranged perpendicularly between the side of the fan-shaped plate and the connecting block; the bottom of the fan-shaped plate is fixedly arranged in the first U-shaped notch, and one end of the connecting block away from the fan-shaped plate is arranged to pass through the first U-shaped notch; two weight balancing plates are fixedly arranged on both sides of the plate surface of the fan-shaped plate and above the hook; a plurality of tooth grooves are arranged on the arc surface of the fan-shaped plate along the length direction of the fan-shaped plate; a second U-shaped notch is arranged on the end surface of the connecting block away from the fan-shaped plate; the angle bisector of the fan-shaped plate and the axis of the hook neck are arranged on the same straight line. The hook and the weight are rotatably arranged on the lower side between the first and second shielding plates through a pin shaft assembly, the bottom of the hook is arranged to pass through the bottom of the hook shield, and the hook is convenient for hooking goods.

4. The self-locking mechanical automatic opening and closing hook according to claim 2, characterized in that, A U-shaped hook limiting plate is fixedly arranged on the lower part of the inner side wall of the first shielding plate away from the connecting plate, and is used for limiting the hook in the locked and released states respectively.

5. The self-locking mechanical automatic opening and closing hook according to claim 3, characterized in that, The tension spring assembly comprises a first fixed rod, a second fixed rod and a tension spring. The first fixed rod is fixedly arranged in the second U-shaped notch, and the first fixed rod is arranged perpendicularly to the plate surface of the fan-shaped plate. The second fixed rod is arranged between the first and second shielding plates and on the side of the clamping plate assembly close to the connecting plate, and the second fixed rod is arranged in parallel to the first fixed rod. One end of the tension spring is arranged to be hooked on the first fixed rod, and the other end of the tension spring is arranged to be hooked on the second fixed rod.

6. The self-locking mechanical automatic opening and closing hook according to claim 3, characterized in that, The clamping plate assembly comprises a third fixed rod, a clamping plate, a fourth fixed rod, a torsion spring limiting plate and a torsion spring. The third fixed rod is fixedly arranged between the first and second shielding plates, and the third fixed rod is arranged perpendicularly to the first shielding plate. The clamping plate is sleeved on the circumferential outer side of the third fixed rod corresponding to the rotation of the sector plate, one end of the clamping plate close to the sector plate is integrally formed with a tooth corresponding to the tooth groove, and the tooth can be clamped into the inside of the tooth groove; one end of the clamping plate away from the tooth is integrally formed with an angle plate, and a clamping groove is arranged between the angle plate and the clamping plate away from the tension spring; The fourth fixed rod is fixed between the first guard plate and the second guard plate corresponding to the clamping groove, and the fourth fixed rod is arranged in parallel with the third fixed rod; The torsion spring limiting plate is fixed between the first guard plate and the second guard plate away from the connecting plate corresponding to the clamping plate, and a through hole is arranged on the plate surface of the torsion spring limiting plate; The torsion spring is sleeved on the circumferential wall surface of the fourth fixed rod, one end of the torsion spring abuts against the side surface of the clamping plate, and the other end of the torsion spring passes through the through hole.

7. The self-locking mechanical automatic opening and closing hook according to claim 6, characterized in that, The pressing block assembly comprises a U-shaped pull plate, the opening end of the U-shaped pull plate is sleeved on the top outer side of the first guard plate and the second guard plate, a connecting shaft is arranged through the opening end of the U-shaped pull plate, the top end of the first guard plate and the top end of the second guard plate, the connecting shaft is fixed on the circumferential outer side between the first guard plate and the second guard plate, and a pressing block is sleeved on the connecting shaft; the first guard plate and the second guard plate are rotatably connected with the connecting shaft; and the U-shaped pull plate is fixedly connected with the connecting shaft.

8. The self-locking mechanical automatic opening and closing hook according to claim 7, characterized in that, The connecting shaft is arranged perpendicularly to the plate surface of the U-shaped pull plate, the first guard plate and the second guard plate.

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