Safety hooks

Abstract

The present disclosure provides a safe hook, comprising a hook body and a limiting control mechanism, the hook body is provided with a hook cavity with an opening and a hanging assembly, the hanging assembly is located at the top of the hook body, the limiting control mechanism is provided with a first stop block above the opening of the hook cavity, the limiting control mechanism can slide up and down relative to the hook body and is locked with the hook body, the first stop block moves up and down with the limiting control mechanism, and the up and down movement of the first stop block can open and close the hook cavity. The present disclosure is convenient and fast to operate, and is not prone to problems such as deformation and damage of parts, unopenable hook, and failure of the hung object to smoothly come out of the hook cavity, the first stop block does not occupy the space of the hook cavity, does not cause the reduction of the self-carrying volume of the hook cavity, and has high safety, stability and reliability, can meet higher and higher use requirements, and expands the application and promotion of the product.

Description

Technical Field

[0001] This disclosure relates to crane mechanical parts, and more particularly to a safety hook. Background Technology

[0002] Lifting hooks are one of the most common lifting tools in hoisting machinery, also known as hooks or shackles. They are typically suspended from the wire rope of a hoisting mechanism using pulley blocks and other components, and are widely used in factories, mines, and the petroleum industry. To prevent the risk of the hook detaching, traditional methods involve a combination of a baffle and a spring at the hook's opening. One end of the baffle is hinged to the hook, while the other end rests against the inside of the hook head under the spring's rebound force. However, this structure has low resistance to accidental impact loads and is prone to deformation after repeated use, leading to component damage, difficulty in opening the baffle, and inability to smoothly remove the hook from the hook cavity. Furthermore, the baffle occupies some space in the hook cavity, reducing its capacity and resulting in poor safety and reliability. This makes it unable to meet increasingly demanding usage requirements, hindering the product's application and promotion. Summary of the Invention

[0003] The purpose of this disclosure is to provide a safety hook that can solve at least one of the above-mentioned technical problems. The technical solution of this disclosure is as follows:

[0004] A safety hook includes a hook body and a limit control mechanism. The hook body is provided with a hook cavity with an opening and a suspension assembly. The suspension assembly is located at the top of the hook body. The limit control mechanism is provided with a first stop block located above the opening of the hook cavity. The limit control mechanism can slide up and down relative to the hook body and lock with the hook body. The first stop block moves up and down with the limit control mechanism. The up and down movement of the first stop block can open and close the hook cavity.

[0005] In some embodiments, a first hook is provided on the hook body, the first hook and the hook body form a hook cavity, and a first stop is located above the first hook.

[0006] In some embodiments, the top of the first hook is provided with a first groove, the first stop is provided with a first engagement part that can be inserted into the first groove, and the first stop is provided with a second groove corresponding to the hook cavity.

[0007] In some embodiments, a first hook is provided on both sides of the lower end of the hook body, and the two first hooks and the hook body form two hook cavities. A first stop is provided on both sides of the lower end of the limit control mechanism, and the first stop corresponds to the first hook one by one. The two first hooks are integrally formed with the hook body.

[0008] In some embodiments, the suspension assembly includes a first connecting shaft, a first locking member, and two symmetrically arranged first ear plates. Each of the two first ear plates is provided with a first connecting hole that connects to the first connecting shaft, and the first locking member can lock the first connecting shaft to the first ear plate.

[0009] In some embodiments, the first locking element is a locking pin, the first connecting shaft is provided with a first annular groove that cooperates with the first locking element, the first ear plate is provided with a second connecting hole that cooperates with the first locking element, the second connecting hole is perpendicular to the first connecting hole, and at least a portion of the second connecting hole intersects with the first connecting hole, and the two first ear plates are integrally formed with the hook body.

[0010] In some embodiments, the limiting control mechanism includes a first limiting sleeve fitted on the hook body, a first stop block disposed at the lower end of the first limiting sleeve, a control button and a first elastic element disposed on the hook body, and a first positioning through hole and a second positioning through hole disposed on the first limiting sleeve that can cooperate with the control button. The first positioning through hole is located above the second positioning through hole. The control button can extend out of the first limiting sleeve through the first positioning through hole and the second positioning through hole respectively. When the control button cooperates with the first positioning through hole, the first stop block closes the hook cavity. When the control button cooperates with the second positioning through hole, the first stop block opens the hook cavity. Pressing the control button can retract the control button into the first limiting sleeve and cause the first elastic element to elastically deform. When the control button retracts into the first limiting sleeve, the first limiting sleeve can slide up and down relative to the hook body.

[0011] In some embodiments, the hook body is provided with a first fixing rod, the first fixing rod is provided with a third groove and a first plug that cooperates with the third groove, one end of the control button is provided with a first pressing part, the other end of the control button is provided with a first flange, the first elastic element is a compression spring provided in the third groove, the first plug is provided with a first through hole for the first pressing part to pass through, the first flange is located in the third groove, and the diameter of the first flange is larger than the diameter of the third groove, one end of the first elastic element presses against the bottom surface of the third groove, and the other end of the first elastic element presses against the end surface of the first flange.

[0012] In some embodiments, a second elastic element is also provided inside the first limiting sleeve. As the first limiting sleeve slides upward along the hook body, the second elastic element elastically deforms. A first sliding groove that cooperates with the control button is provided on the inner wall of the first limiting sleeve. The first sliding groove is connected to the first positioning through hole and the second positioning through hole respectively. The first stop block is fixedly connected to the first limiting sleeve. A first slot is provided at the bottom of the first limiting sleeve. A second insertion part that cooperates with the first slot is provided on the first stop block.

[0013] In some embodiments, the second elastic element is a compression spring sleeved on the hook body. The second elastic element is located inside the first limiting sleeve. The hook body is provided with a second through hole connected to the first fixing rod and a second locking element for locking the first fixing rod. Both ends of the first fixing rod extend out of the second through hole. The second insertion part extends into the first limiting sleeve through the first slot. Two first support plates are provided inside the first limiting sleeve. The second elastic element is located between the two first support plates. Each of the two first support plates is provided with a third through hole that cooperates with the hook body. One end of the second elastic element presses one of the first support plates against the first fixing rod, and the other end of the second elastic element presses the other first support plate against the second insertion part.

[0014] Furthermore, unless otherwise specified in this disclosure, all technical solutions can be implemented using conventional methods in the field. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the specific embodiments of this disclosure or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is an exploded view of a safety hook according to one embodiment of the present disclosure.

[0017] Figure 2 This is a structural diagram of the safety hook in the open state according to one embodiment of the present disclosure.

[0018] Figure 3 This is a structural diagram of the safety hook in the closed state according to one embodiment of the present disclosure.

[0019] Figure 4 This is a cross-sectional view of the safety hook in the closed state according to one embodiment of this disclosure.

[0020] Figure 5 This is a cross-sectional view of the safety hook in the closed state according to one embodiment of this disclosure.

[0021] Figure 6 This is a safety hook according to one embodiment of the present disclosure.

[0022] Figure 7 This is a schematic diagram of the hook and suspension assembly according to one embodiment of the present disclosure.

[0023] Figure 8 This is a partial cross-sectional view of a safety hook according to one embodiment of the present disclosure.

[0024] Figure 9 This is a schematic diagram of the structure of the first support plate according to one embodiment of the present disclosure.

[0025] Figure 10 This is a schematic diagram of the structure of the first limiting sleeve according to one embodiment of the present disclosure.

[0026] Figure 11 This is a schematic diagram of the structure of the first block according to one embodiment of the present disclosure.

[0027] The reference numerals in the attached diagram are as follows: hook body 1, hook cavity 101, second through hole 102, second locking element 103, first sliding part 104, first flat part 105, first hook 11, first groove 111, control button 12, first pressing part 121, first flange 122, first elastic element 13, first fixing rod 14, third groove 141, fourth through hole 142, first plug 15, first through hole 151, second elastic element 16, first support plate 17, third through hole 17 1. Second flat position 172, limit control mechanism 2, first stop block 21, first insertion part 211, second groove 212, second insertion part 213, first pressing surface 214, first limit sleeve 22, first positioning through hole 221, second positioning through hole 222, first sliding groove 223, first slot 224, suspension assembly 3, first connecting shaft 31, first annular groove 311, first locking member 32, first ear plate 33, first connecting hole 331, second connecting hole 332. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this disclosure clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only some, not all, of the embodiments of this disclosure, and are used merely to explain this disclosure and are not intended to limit it. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without inventive effort are within the scope of protection of this disclosure.

[0029] In the description of this disclosure, it should be noted that the terms "center," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "inner," "outer," "both ends," "both sides," "bottom," and "top," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the elements referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure. Furthermore, the terms "first," "second," "upper-level," "lower-level," "primary," and "secondary," etc., are used for descriptive purposes only and can be simply used to more clearly distinguish different components, and should not be construed as indicating or implying relative importance.

[0030] In the description of this disclosure, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections, mechanical connections or electrical connections, direct connections or indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0031] See Figures 1-11 The diagram schematically illustrates a safety hook according to the present disclosure, including a hook body 1 and a limit control mechanism 2. The hook body 1 is provided with a hook cavity 101 and a suspension assembly 3. The hook cavity 101 has an opening, which is usually located at its top. The suspension assembly 3 is located at the top of the hook body 1. The limit control mechanism 2 is provided with a first stop 21 corresponding to the hook cavity 101. The first stop 21 is located above the opening of the hook cavity 101. The limit control mechanism 2 can slide up and down relative to the hook body 1 and can lock with the hook body 1. The first stop 21 moves up and down together with the limit control mechanism 2. The up and down movement of the first stop 21 can open and close the hook cavity 101, that is, open and close the hook.

[0032] During use, such as Figure 6As shown, the suspension assembly 3 is connected to a corresponding chain or wire rope, such as the chain or wire rope of a crane's upgrade mechanism. The corresponding traction chain passes through the object to be hoisted, and the two lifting rings of the traction chain are respectively hooked at the position of the hook cavity 101. The limit control mechanism 2 is locked to the hook body 1, and the first stop 21 on the limit control mechanism 2 closes the hook cavity 101 to ensure that the lifting rings of the traction chain will not come out of the hook cavity 101. After the corresponding object is hoisted to the designated position, the lock between the limit control mechanism 2 and the hook body 1 is first released, and then the limit control mechanism 2 slides upward along the hook body 1. The first stop 21 moves upward together with the limit control mechanism 2, causing the hook cavity 101 to open, and then the lifting ring of the traction chain can be removed. The operation is convenient and quick, the structure is simple and stable, and it has high resistance to accidental impact loads. It is not easy to cause problems such as deformation and damage of parts, hook not being able to open, or the hanging object not being able to be smoothly removed from the hook cavity 101. The first stop 21 also occupies the space of the hook cavity 101, which will not reduce the capacity of the hook cavity 101 itself. It has high safety, stability and reliability, long service life, and can meet increasingly higher usage requirements, thus expanding the application and promotion of the product.

[0033] The hook body 1 is provided with a first hook 11, which forms a hook cavity 101 with the hook body 1. A first stop 21 is located above the first hook 11, making operation more convenient. A first groove 111 is also provided at the top of the first hook 11. The first stop 21 is provided with a first engagement part 211 that can be inserted into the first groove 111. When the first stop 21 closes the hook cavity 101, the first engagement part 211 is inserted into the first groove 111, resulting in a tighter and more secure connection, better preventing the hooked object from coming off. A second groove 212 corresponding to the hook cavity 101 is provided on the first stop 21. When the first stop 21 closes the hook cavity 101, the second groove 212 also becomes part of the hook cavity 101, increasing the load-bearing capacity of the hook cavity 101.

[0034] The lower end of the hook body 1 is provided with two first hooks 11 on both sides, forming two hook cavities 101 with the hook body 1. The lower end of the limit control mechanism 2 is provided with two first stops 21 on both sides, with each first stop 21 corresponding to one of the first hooks 11. The double-hook structure makes the structure more stable and reliable. The two first hooks 11 are integrally formed with the hook body 1, such as by casting, which makes the structure more stable and reliable.

[0035] The suspension assembly 3 includes a first connecting shaft 31, a first locking member 32, and two symmetrically arranged first ear plates 33. Each of the two first ear plates 33 has a first connecting hole 331 for connecting to the first connecting shaft 31. The first connecting shaft 31 is used to connect to a corresponding wire rope or chain. The first locking member 32 locks the first connecting shaft 31 to the first ear plates 33, preventing axial movement or shaking of the first connecting shaft 31 and ensuring structural stability. The two first ear plates 33 and the hook body 1 can be integrally formed, such as by casting, resulting in a more robust and reliable structure.

[0036] The first locking element 32 is a locking pin. The first connecting shaft 31 is provided with a first annular groove 311 that cooperates with the first locking element 32. The first ear plate 33 is provided with a second connecting hole 332 that cooperates with the first locking element 32. The second connecting hole 332 is perpendicular to the first connecting hole 331, and at least a part of the second connecting hole 332 intersects with the first connecting hole 331. The first connecting shaft 31 is connected to the first connecting hole 331, and the locking pin is connected to the second connecting hole 332. At the same time, the locking pin cooperates with the first annular groove 311, thereby making the first connecting shaft 31 axially fixed and the first connecting shaft 31 able to rotate, which is safer and more reliable.

[0037] The limit control mechanism 2 includes a first limit sleeve 22 sleeved on the hook body 1, a first stop block 21 disposed at the lower end of the first limit sleeve 22, a control button 12 and a first elastic element 13 disposed on the hook body 1, the first elastic element 13 cooperating with the control button 12, the first limit sleeve 22 disposed with a first positioning through hole 221 and a second positioning through hole 222 that can cooperate with the control button 12, the first positioning through hole 221 being located above the second positioning through hole 222, and the first positioning through hole 221 and the second positioning through hole 222 being arranged sequentially in the vertical direction. Under the action of the first elastic element 13, the control button 12 can extend out of the first limiting sleeve 22 through the first positioning through hole 221 and the second positioning through hole 222 respectively. Pressing the control button 12 can retract the control button 12 into the first limiting sleeve 22, and pressing the control button 12 can cause the first elastic element 13 to elastically deform. When the control button 12 is engaged with the first positioning through hole 221, the first stop block 21 closes the hook cavity 101, that is, the hook is in a closed state. When the control button 12 is engaged with the second positioning through hole 222, the first stop block 21 opens the hook cavity 101. Cavity 101, i.e., the hook is in the open state; when the hook in the closed state is opened, press the control button 12, the first elastic element 13 elastically deforms until the control button 12 retracts into the first limiting sleeve 22 along the first positioning through hole 221, and then the first limiting sleeve 22 slides upward along the hook body 1 until the control button 12 corresponds to the second positioning through hole 222. Under the action of the first elastic element 13, the control button 12 extends through the second positioning through hole 222 and out of the first limiting sleeve 22 for locking. The same principle applies when the hook in the open state is closed. The operation is convenient and the structure is stable and reliable.

[0038] The hook body 1 is provided with a first fixing rod 14, which is located inside the first limiting sleeve 22. The first fixing rod 14 is provided with a third groove 141 and a first plug 15 that cooperates with the third groove 141. The first plug 15 and the first fixing rod 14 can be connected by snap-fit, threaded connection, etc. One end of the control button 12 is provided with a first pressing part 121, and the other end of the control button 12 is provided with a first flange 122. The first elastic element 13 is a compression spring provided in the third groove 141. The first plug 15 is provided with a first through hole 151 for the first pressing part 121 to pass through. The first flange 122 is located inside the third groove 141, and the diameter of the first flange 122 is larger than the diameter of the third groove 141. One end of the first elastic member 13 presses against the bottom surface of the third groove 141, and the other end of the first elastic member 13 presses against the end face of the first flange 122. Pressing the first pressing part 121 of the control button 12 causes the first flange 122 of the control button 12 to slide along the axial direction of the third groove 141. At the same time, the first flange 122 causes the first elastic member 13 to elastically deform. After releasing the control button 12, the first elastic member 13 pushes the control button 12 to reset by relying on the elastic restoring force.

[0039] The inner wall of the first limiting sleeve 22 is provided with a first sliding groove 223 that cooperates with the control button 12. The first sliding groove 223 communicates with the first positioning through hole 221 and the second positioning through hole 222 respectively. The first limiting sleeve 22 slides up and down along the hook body 1, and at the same time, the first sliding groove 223 slides up and down along the control button 12, making the movement more stable and reliable. The first pressing part 121 can adopt a spherical or arc surface structure, which facilitates pressing and also facilitates the sliding of the first sliding groove 223 along the control button 12.

[0040] The outer wall of the first limiting sleeve 22 may also be provided with an anti-slip structure, such as an anti-slip groove, an anti-slip protrusion, or an anti-slip mesh, to make it easier to operate the first limiting sleeve 22.

[0041] The first stop block 21 is fixedly connected to the first limiting sleeve 22, for example, by welding. The bottom of the first limiting sleeve 22 is provided with a first slot 224, and the first stop block 21 is provided with a second insertion part 213 that mates with the first slot 224, resulting in a tighter and more reliable connection. The first stop block 21 is also provided with a first pressing surface 214 that mates with the first limiting sleeve 22. The second insertion part 213 is inserted into the first slot 224, while the first pressing surface 214 presses against the outer wall of the first limiting sleeve 22, making the structure more stable. The first stop block 21 and the first limiting sleeve 22 can also be integrally formed by casting or other methods.

[0042] The first limiting sleeve 22 is also provided with a second elastic element 16. The second elastic element 16 cooperates with the first limiting sleeve 22. When the hook in the closed state is opened, the control button 12 is pressed, and the first elastic element 13 elastically deforms until the control button 12 retracts into the first limiting sleeve 22 along the first positioning through hole 221. Then the first limiting sleeve 22 slides upward along the hook body 1, and the first limiting sleeve 22 slides upward along the hook body 1, causing the second elastic element 16 to elastically deform until the control button 12 corresponds to the second positioning through hole 222. Under the action of the first elastic element 13, the control button 12 extends through the second positioning through hole 222 and extends out of the first limiting sleeve 22 for locking. The same principle applies when the hook in the open state is closed. The second elastic element 16 also facilitates pushing the first limiting sleeve 22 downward.

[0043] The hook body 1 is provided with a second through hole 102 connected to the first fixing rod 14 and a second locking member 103 for locking the first fixing rod 14. Both ends of the first fixing rod 14 extend out of the second through hole 102. The second insertion part 213 passes through the first slot 224 and extends into the first limiting sleeve 22. Two first support plates 17 are provided inside the first limiting sleeve 22. The first fixing rod 14 is located above the second insertion part 213, and the two first support plates 17 are located between the second insertion part 213 and the first fixing rod 14. Between 4, the second elastic element 16 is a compression spring sleeved on the hook body 1. The second elastic element 16 is located inside the first limiting sleeve 22 and between the two first support plates 17. The two first support plates 17 are respectively provided with third through holes 171 that cooperate with the hook body 1. One end of the second elastic element 16 presses one of the first support plates 17 against the first fixing rod 14, and the other end of the second elastic element 16 presses the other first support plate 17 against the second insertion part 213. When the first limiting sleeve 22 slides upward along the hook body 1, the first support plate 17 cooperating with the first fixing rod 14 remains stationary, while the first support plate 17 cooperating with the second insertion part 213 slides upward together with the first limiting sleeve 22, so that the second elastic element 16 is compressed. The structure is simple, compact, and stable, and processing and assembly operations are more convenient.

[0044] The second locking member 103 can be a set screw. The hook body 1 is provided with a threaded hole that mates with the set screw. The threaded hole is connected to the second through hole 102. The set screw passes through the threaded hole to press the first fixing rod 14, thereby fixing the first fixing rod 14 and preventing the first fixing rod 14 from moving or shaking.

[0045] The hook body 1 is provided with a first sliding part 104 that mates with the second through hole 102. The first sliding part 104 is provided with a first flat part 105. A second flat part 172 that mates with the first flat part 105 is provided within the third through hole 171. The engagement of the first flat part 105 and the second flat part 172 fixes the hook body 1 and the first support plate 17 circumferentially, allowing only axial relative sliding between them. This prevents the first limiting sleeve 22 from rotating relative to the hook body 1, thus enhancing safety and reliability. (First flat part 105 and second flat part 172 are mentioned.)

[0046] The lower end of the hook body 1 is provided with two first hooks 11 on both sides, and the two first hooks 11 and the hook body 1 form two hook cavities 101. The lower end of the limit control mechanism 2 is provided with two first stops 21 on both sides, and the first stops 21 correspond one-to-one with the first hooks 11. Figure 8As shown, control buttons 12 are respectively provided at both ends of the first fixing rod 14, and first positioning through holes 221 and second positioning through holes 222 are respectively provided on both sides of the first limiting sleeve 22. A fourth through hole 142 for the first pressing part 121 to pass through is provided on the bottom surface of the third groove 141. The diameter of the first flange 122 is larger than the diameter of the fourth through hole 142. The first elastic member 13 is located between the two control buttons 12, and the two first flanges 122 are located in the third groove 141. The two ends of the first elastic member 13 are respectively pressed against the two first flanges 122, resulting in more uniform force distribution and a more stable and reliable structure.

[0047] Compared with the prior art, the advantages of this disclosure are as follows: the locking and unlocking of the first limiting sleeve 22 and the hook body 1 are controlled by the control button 12; the first limiting sleeve 22 slides up and down along the hook body 1; the first stop block 21 moves up and down with the first limiting sleeve 22, so that the first stop block 21 opens and closes the hook cavity 101, that is, the hook opens and closes; the first elastic element 13 enables the control button 12 to cooperate with the first positioning through hole 221 and the second positioning through hole 222 respectively for locking, pushing the control button 12 to reset, etc.; the second elastic element 16 facilitates pushing the first limiting sleeve 22 to move downward along the hook body 1 to reset, etc.; the first sliding groove 223 facilitates the control button 12 to enter the first positioning through hole 22. The first stop 21 has a second positioning through hole 222, and the second insertion part 213 of the first stop 21 extends into the first limiting sleeve 22 through the first slot 224, which facilitates the support of the first support plate 17. The operation is convenient and quick, the structure is simple, compact and stable, and the processing and assembly are convenient. It has high resistance to accidental impact loads and is not prone to problems such as deformation and damage of parts, hook not being able to open, and hanging objects not being able to be smoothly removed from the hook cavity 101. The first stop 21 also occupies the space of the hook cavity 101, which will not reduce the capacity of the hook cavity 101 itself. It has high safety, stability and reliability, long service life, and can meet increasingly higher usage requirements, thus expanding the application and promotion of the product.

[0048] The above descriptions are merely some embodiments of this disclosure, used only to illustrate the technical solutions of this disclosure, and not to limit it. It should be understood that those skilled in the art can make improvements or substitutions based on the above descriptions without departing from the inventive concept of this disclosure, and all such improvements and substitutions should fall within the protection scope of the appended claims. In such cases, all details can be replaced with equivalent elements, and materials, shapes, and sizes can also be arbitrary.

Claims

1. A safety hook, characterized in that The utility model provides hook body (1) and position control mechanism (2) including, the hook cavity (101) with opening and the suspension assembly (3) are provided with on the hook body (1), the suspension assembly (3) is located the top of hook body (1), the first stopper (21) that position control mechanism (2) is provided with is located the opening above hook cavity (101), position control mechanism (2) can slide up and down relative with hook body (1) and lock with hook body (1), the first stopper (21) moves up and down with position control mechanism (2), the first stopper (21) moves up and down can open and close hook cavity (101); First hook (11) is provided with on the hook body (1), and the first hook (11) forms hook cavity (101) with the hook body (1), and the first stopper (21) is located the upper side of first hook (11); The suspension assembly (3) includes first connecting shaft (31), first locking piece (32) and the first ear plate (33) of symmetry setting two, first connecting hole (331) is arranged with first connecting shaft (31) on two first ear plate (33) respectively, and first locking piece (32) can lock first connecting shaft (31) with first ear plate (33); Position control mechanism (2) includes the first limit sleeve (22) of setting on hook body (1), and the first stopper (21) is arranged at the lower end of first limit sleeve (22), and the hook body (1) is provided with control button (12) and first elastic member (13), and the first limit sleeve (22) is provided with the first positioning through -hole (221) and the second positioning through -hole (222) that can cooperate with control button (12), the first positioning through -hole (221) is located the upper side of second positioning through -hole (222), and control button (12) can respectively pass through first positioning through -hole (221) and second positioning through -hole (222) and extend to the outside of first limit sleeve (22), in the cooperation of control button (12) with first positioning through -hole (221), the first stopper (21) closes hook cavity (101), in the cooperation of control button (12) with second positioning through -hole (222), the first stopper (21) opens hook cavity (101), and the control button (12) can be retracted into first limit sleeve (22) and make first elastic member (13) elastically deformed by pressing control button (12), in the retraction of control button (12) into first limit sleeve (22), first limit sleeve (22) can slide up and down relative with hook body (1); The hook body (1) is provided with a first fixed rod (14), the first fixed rod (14) is provided with a third groove (141) and a first plug (15) matched with the third groove (141), one end of the control button (12) is provided with a first pressing part (121), the other end of the control button (12) is provided with a first flange (122), the first elastic member (13) is a compression spring arranged in the third groove (141), the first plug (15) is provided with a first through hole (151) for the first pressing part (121) to pass through, the first flange (122) is located in the third groove (141), and the caliber of the first flange (122) is greater than that of the third groove (141), one end of the first elastic member (13) is pressed against the bottom surface of the third groove (141), and the other end of the first elastic member (13) is pressed against the end surface of the first flange (122); The first limiting sleeve (22) is further provided with a second elastic member (16), the second elastic member (16) is elastically deformed as the first limiting sleeve (22) slides upwards along the hook body (1), the inner wall of the first limiting sleeve (22) is provided with a first sliding groove (223) matched with the control button (12), the first sliding groove (223) is respectively communicated with the first positioning through hole (221) and the second positioning through hole (222), the first limiting sleeve (22) is fixedly connected with the first limiting sleeve (22), and the bottom of the first limiting sleeve (22) is provided with a first clamping groove (224), and the first blocking block (21) is provided with a second insertion part (213) matched with the first clamping groove (224).

2. The safety hook according to claim 1, characterized in that The top of the first hook (11) is provided with a first groove (111), the first blocking block (21) is provided with a first insertion part (211) capable of being inserted into the first groove (111), and the first blocking block (21) is provided with a second groove (212) corresponding to the hook cavity (101).

3. The safety hook according to claim 2, characterized in that The lower ends of the hook body (1) are respectively provided with the first hook (11), the two first hooks (11) and the hook body (1) form two hook cavities (101), and the lower ends of the limiting control mechanism (2) are respectively provided with the first blocking block (21), the first blocking block (21) corresponds to the first hook (11) one by one, and the two first hooks (11) and the hook body (1) are integrally formed.

4. The safety hook of claim 1, wherein, The first locking piece (32) is a locking pin, the first connecting shaft (31) is provided with a first annular groove (311) matched with the first locking piece (32), the first lug (33) is provided with a second connecting hole (332) matched with the first locking piece (32), the second connecting hole (332) is perpendicular to the first connecting hole (331), and at least a part of the second connecting hole (332) intersects with the first connecting hole (331), and the two first lugs (33) are integrally formed with the hook body (1).

5. Safety hook according to any of claims 1 to 4, characterized in that The second elastic piece (16) is a compression spring sleeved on the hook body (1), the second elastic piece (16) is located in the first limiting sleeve (22), the hook body (1) is provided with a second through hole (102) connected with the first fixed rod (14) and a second locking piece (103) locking the first fixed rod (14), both ends of the first fixed rod (14) respectively extend out of the second through hole (102), the second insertion part (213) penetrates through the first clamping groove (224) and extends into the first limiting sleeve (22), the first limiting sleeve (22) is provided with two first supporting plates (17), the second elastic piece (16) is located between the two first supporting plates (17), the two first supporting plates (17) are respectively provided with a third through hole (171) matched with the hook body (1), one end of the second elastic piece (16) presses one of the first supporting plates (17) against the first fixed rod (14), and the other end of the second elastic piece (16) presses the other first supporting plate (17) against the second insertion part (213).

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