A hook anti-derailment device that can be safely locked and prevent crushing injuries.

Abstract

This invention discloses a hook anti-detachment device capable of safe locking and preventing crushing injuries, relating to the field of lifting machinery and equipment. The device includes, from bottom to top, a lower clamp, a base, and an upper clamp, sequentially fitted and pressed together on the hook handle; a positioning sleeve ringing the outer surface of the base; a positioning cover fastened above the base, forming a clamping cavity with the base; a baffle symmetrically hinged to the outer surface of the base by springs and pins, capable of rotating and safely locking within the hook cavity; and a lever installed at the center height of the positioning sleeve, capable of horizontal rotation for three-position switching. This invention enables automatic sling attachment and automatic hook opening closure; it achieves closed-end safety locking, preventing sling detachment accidents caused by spring fatigue failure leading to the baffle's inability to close the hook opening; and it achieves open-end safety locking, eliminating the risk of injury from sling crushing during manual sling removal by pressing the baffle.

Description

Technical Field

[0001] This invention relates to the technical field of lifting machinery and equipment, and more specifically to a hook anti-detachment device that can safely lock and prevent crushing injuries. Background Technology

[0002] Among the types of accidents involving lifting machinery, falls are the most common and serious. A crane fall accident refers to an accident during lifting operations where the load, lifting equipment, or other heavy objects fall from the air, causing personal injury and equipment damage. Unhooking accidents are a type of crane fall accident, occurring when the load, lifting rope, or special lifting equipment detaches from the hook and falls. The main cause of unhooking accidents is the lack of an anti-detachment device on the hook or the malfunction of the anti-detachment device.

[0003] Traditional hook anti-derailment devices mainly consist of springs and baffles. When the hook is attached to the sling, the sling squeezes open the baffle, allowing the sling to enter the hook. The baffle, under the action of the spring, returns to its original position and locks at the hook opening, preventing the sling from detaching. However, unloading the sling requires manual removal of the sling by opening the baffle. This traditional hook anti-derailment device has the following drawbacks: 1. Large hooks have heavy and rigid slings, making it easy to be injured by the sling when manually pressing the baffle during unloading; 2. In some long-used hook anti-derailment devices, spring fatigue causes the baffle to fail to close properly, potentially allowing the sling to detach and creating a safety hazard. Therefore, a hook anti-derailment device that can be safely locked and prevents injury from squeezing is needed. Summary of the Invention

[0004] The purpose of this invention is to solve the aforementioned technical problems by providing a hook anti-detachment device that can safely lock and prevent injury from squeezing. This invention enables automatic sling attachment and automatic hook closure; it achieves closed-end safety locking, preventing the sling from detaching due to spring fatigue failure causing the baffle to fail to close the hook; and it achieves open-end safety locking, eliminating the risk of injury from sling squeezing when manually pressing the baffle to remove the sling.

[0005] The objective of this invention can be achieved through the following measures:

[0006] This invention provides a hook anti-derailment device capable of secure locking and preventing crushing injuries, comprising, from bottom to top, a lower clamp, a base, and an upper clamp (the base is securely mounted on the hook handle through the supporting action of the lower clamp and the pressing action of the upper clamp), a positioning sleeve that loops around the outer surface of the base, and a positioning cover that snaps onto the top of the base and forms a clamping cavity with the base (the positioning cover is fixedly mounted on the base through the supporting action of the base and the positioning action of the upper clamp; the clamping cavity is used to install the positioning sleeve), symmetrically hinged to the outer surface of the base by springs and pins. 0and 180 0 A baffle, located at the center height of the positioning sleeve, can rotate, open, close, and lock safely within the hook cavity (this invention uses a spring in conjunction with the baffle to automatically suspend the sling and automatically close the hook opening; this invention uses a closing locking block in conjunction with the baffle to achieve a closed safety lock, avoiding the sling falling off the hook opening due to spring fatigue failure and the baffle's inability to close the hook opening, thus preventing sling detachment accidents; this invention uses an opening locking block in conjunction with the baffle to achieve an open safety lock, eliminating the hidden danger of being squeezed by the sling when manually pressing the baffle to remove the sling in the traditional way), is installed at the center height of the positioning sleeve via a threaded connection and horizontal extension, and is a lever that can rotate horizontally to switch between three positions (the lever can drive the positioning sleeve to rotate and flexibly switch between the automatic opening / closing position, the closed locking position, and the open locking position as needed); the positioning sleeve includes a cylindrical base and a 30mm thick layer on the outer surface of the cylindrical base. 0 and 210 0 The opening locking block is located at the upper-middle position of the orientation and is set on the outer surface of the cylindrical base at 155 degrees. 0 and 335 0 The closing locking block is located at the lower middle position of the orientation and is set on the outer surface of the cylindrical base at 90 degrees. 0 A lever connecting seat with internal threads is located at the center height of the orientation (the cylindrical base serves as the mounting foundation for the opening locking block, closing locking block, and lever connecting seat; the opening locking block, in conjunction with the baffle, enables safe locking of the opening; the closing locking block, in conjunction with the baffle, enables safe locking of the closing; the lever connecting seat is used to connect the lever); the positioning cover is welded from a top ring disc and an outer cylindrical column, located at 90 degrees of the outer cylindrical column. 0 A positioning groove (serving as a rotating sliding track for the lever) is machined at the center height position. At 60 degrees of the positioning groove... 0 Direction, 90 0 Direction, 107 0 Positioning holes (90°) are provided in all directions. 0 The directional positioning hole is an automatic opening and closing position, which is the initial position of the lever and is used when attaching the sling; 107 0 The directional positioning hole is a closed locking stop, used after the sling is engaged in the hook cavity and the hook opening automatically closes; 60 0 The directional positioning hole is an open locking stop (used when unloading slings), located at 0 on the outer cylinder. 0 Orientation and 180 0A downward-facing, open baffle slot is machined at the lower-middle position of the baffle (to prevent motion interference when the baffle rotates open and closes); the baffle is composed of a baffle base plate and baffle side plates perpendicular to both sides of the baffle base plate (the baffle side plates, when used with a closing locking block, can achieve a closed safety lock); pin holes for inserting pins are machined at the larger ends of the two baffle side plates; a trapezoidal boss extends outward from the pin hole end of the baffle base plate (the trapezoidal boss, when used with an opening locking block, can achieve an opening safety lock); when the lever is at 90 degrees of the positioning groove... 0 When the automatic opening / closing position is engaged, the baffle rotates freely under the external force of the sling to open the hook opening, allowing the sling to enter the hook cavity. After the external force disappears, the baffle automatically closes the hook opening under the rebound of the spring. When the lever rotates horizontally to position 107 of the positioning groove... 0 When the directional lever is in the closed locking position, the locking block in the clamping cavity rotates together with the positioning sleeve and tightly presses against the inner end face of one of the side upright plates of the baffle to achieve a closed safety lock; when the lever is rotated horizontally to 60 degrees of the positioning slide groove... 0 When the opening is locked at the azimuth position, the opening locking block located in the clamping cavity rotates together with the positioning sleeve and is tightly pressed against the inner surface of the trapezoidal boss in the baffle to achieve a safe locking of the opening.

[0007] The closing locking block described in this invention is manufactured using a trapezoidal thick steel plate. The bottom plane of the trapezoidal thick steel plate is machined into an arc surface that matches the outer surface of the cylindrical base. The top surface of the small end of the trapezoidal column is machined into a slope that matches the slope of the inner end face of the two side plates of the baffle in the closed safety locking state (facilitating the matching of the closing locking block with the side plates of the baffle, enabling closed safety locking, and avoiding the occurrence of detachment accidents caused by the baffle failing to close the hook due to spring fatigue failure). The opening locking block is manufactured using a fan-shaped thick steel plate. The fan-shaped thick steel plate is machined into an arc surface whose inner ring surface matches the outer surface of the cylindrical base, and an outer ring surface... The surface is an involute arc surface that gradually decreases clockwise. The thickness of the larger end of the involute arc surface is equal to the distance between the inner surface of the trapezoidal boss and the outer surface of the cylindrical base when the baffle rotates to the opening safety locking position (this facilitates the matching of the opening locking block and the trapezoidal boss in the baffle, enabling opening safety locking and eliminating the risk of injury from the sling when manually pressing the baffle to remove the sling). The maximum distance between the opening locking block and the closing locking block and the outer surface of the cylindrical base is less than the thickness of the clamping cavity (ensuring that the opening locking block and the closing locking block can rotate smoothly with the cylindrical base within the clamping cavity). Two C-shaped cuts are made on the cylindrical base, with each C-shaped cut at a 90° angle to the cylindrical base. 0 Direction, 107 0Starting from the lower end face of the orientation, the cut is made by cutting upwards along the clockwise slope, then horizontally along the clockwise direction, and then downwards after passing through the left semi-circular arc transition to the lower end face of the cylindrical base. (The C-shaped cut can effectively prevent the cylindrical base in the positioning sleeve from interfering with the mounting lug in the base during rotation.)

[0008] In this invention, both the lower and upper clamps are constructed by interlocking two semi-cylinders and connecting them into a single unit using bolt pairs (both the lower and upper clamps are secured using bolt pairs). The bolt pairs are connected at 90° intervals between the lower and upper clamps. 0 and 270 0 At the orientation (the installation position of the baffle is staggered to avoid movement interference); a conical chamfer is machined around the upper end face of the lower clamp (the conical chamfer facilitates tight clamping and positioning between the base and the lower clamp); at the 0... 0 and 180 0 Each position is equipped with a positioning block (which simultaneously positions the base and the positioning cover, preventing them from rotating and also preventing the positioning cover from moving upwards). The positioning block has a rectangular insert groove machined from top to bottom on the inner side of the cuboid base (for inserting the upper clamp), and a positioning boss is formed on the inner side after removing a rectangular block from bottom to top on the outer side of the cuboid base (which simultaneously inserts into the fixing groove II of the base and the fixing groove I of the positioning cover, for positioning the base and the positioning cover); at the 0... 0 Orientation and 180 0 Fixed groove I is provided at each position. The width of fixed groove I matches the thickness of the positioning boss. The depth of fixed groove I is less than the length of the positioning boss. (Fixed groove I is used to insert the positioning boss of the positioning block in the upper clamp. The two are used together to prevent the positioning cover from rotating and to prevent the positioning cover from moving upward.)

[0009] The base described in this invention is assembled and welded from a bottom ring plate and an inner cylinder column, with the outer cylinder column at 0... 0 Orientation and 180 0 A mounting bracket is fixedly installed at the center height position (the mounting bracket mates with a pin, allowing the baffle to be hinged to the base), at the 0 position of the bottom ring plate. 0 Orientation and 180 0 A baffle movable opening slot is provided at the azimuth position (to avoid motion interference when the baffle rotates and opens), and at the upper end of the inner cylinder column along the 0... 0 Orientation and 180 0 A fixing groove II is provided at the orientation (fixing groove II is used to insert the positioning boss of the positioning block in the upper clamp, and the two are used together to prevent the base from rotating).

[0010] The lever described in this invention consists of a screw, a sleeve fitted onto the screw, and a cotter pin. (When shifting gears, first remove the cotter pin, pull the sleeve backward to lengthen the lever, making it easier to rotate the lever horizontally to the desired gear. Once the lever reaches the corresponding gear, push the sleeve forward and re-fit it completely onto the screw, ensuring the larger diameter section of the sleeve's outer surface is precisely engaged in the positioning hole for gear locking. Then, insert the cotter pin into the cotter pin hole at the rear end of the screw to limit the sleeve's forward and backward movement.) The screw is a three-tiered column structure, wider in the middle and narrower at both ends. The front end of the three-tiered column is machined... It has an external thread that matches the internal thread of the lever connecting seat (the lever is quickly connected to the positioning sleeve via a threaded connection). The diameter of the middle section of the three-step column is smaller than the width of the positioning groove (to facilitate the lever passing through the positioning groove). The diameter of the rear section of the three-step column matches the inner cavity of the sleeve and has a clearance fit (to facilitate the sleeve being fitted onto the screw). A cotter pin hole is machined at the tail of the rear section of the three-step column (for inserting a cotter pin). The sleeve is a hollow cylindrical structure with a two-step column outer surface. The large diameter section of the outer surface of the sleeve matches the inner diameter of the positioning stop hole and has a clearance fit (to facilitate the lever locking in the position).

[0011] The spring described in this invention is a torsion spring (when the sling is attached, the lever is rotated horizontally to 90 degrees of the positioning groove). 0 The automatic opening and closing stop at the initial orientation, under the action of the external force of the sling, compresses the spring, causing the baffle to rotate freely and open the hook opening so that the sling enters the hook cavity. After the external force disappears, the baffle automatically closes the hook opening under the rebound action of the spring, so that the present invention has the functions of automatic sling hanging and automatic hook opening closing; cotter pin holes are machined at both ends of the pin shaft (for inserting cotter pins to limit the horizontal movement of the pin shaft).

[0012] The baffle slot in this invention is a U-shaped hole, and the width of the baffle slot is greater than the width of the baffle (to avoid motion interference when the baffle is rotated and opened).

[0013] The design principle of this invention is as follows:

[0014] This invention provides a hook anti-detachment device that can safely lock and prevent crushing injuries. The invention utilizes a spring and a baffle to automatically engage the sling and automatically close the hook opening. Furthermore, the invention employs a closing locking block with the baffle to achieve a closed-end safety lock, preventing the sling from detaching due to spring fatigue and the baffle's inability to close the hook opening, thus avoiding detachment accidents. Finally, the invention utilizes an opening locking block with the baffle to achieve an open-end safety lock, eliminating the risk of injury from the sling when manually pressing the baffle to remove the sling.

[0015] More specifically, the positioning cover and base designed in this invention interlock to form a cavity for installing the positioning sleeve. The base is securely installed on the hook handle through the supporting action of the lower clamp, the pressing action of the upper clamp, and the positioning function. The positioning cover is fixed to the base through the supporting action of the base and the positioning action of the upper clamp, preventing the positioning cover and base from rotating. A positioning sleeve is ringed around the outer surface of the base. An open locking block and a closed locking block are fixed on the outer surface of the positioning sleeve. The positioning sleeve can rotate within a certain range under the action of the lever. When the positioning sleeve rotates, it drives the open locking block and the closed locking block to rotate synchronously. The lever can slide within the positioning groove. At 60 degrees of the positioning groove... 0 Direction, 90 0 Direction, 107 0 Positioning holes are provided in all directions—corresponding to the opening locking position, automatic opening and closing position, and closing locking position, respectively.

[0016] When attaching the sling, rotate the lever horizontally to 90 degrees of the positioning groove. 0 The automatic opening and closing mechanism at the initial orientation allows the baffle to rotate freely and open the hook opening under the external force of the sling, allowing the sling to enter the hook cavity. After the external force disappears, the baffle automatically closes the hook opening under the rebound action of the spring, thus enabling the invention to have the functions of automatic sling hanging and automatic hook opening closing.

[0017] After the sling is engaged in the hook cavity and the hook opening automatically closes, rotate the lever horizontally to position 107 of the positioning groove. 0 When the directional locking position is closed, the closing locking block located in the clamping cavity rotates together with the positioning sleeve from the initial directional positions of 155° and 335° and is tightly pressed against the inner end face of the side plate of one of the baffles to close and lock safely. This avoids the occurrence of sling detachment accidents caused by the baffle failing to close the hook due to spring fatigue failure.

[0018] When unloading the sling, rotate the lever horizontally to the 60° position of the positioning groove to lock the opening. The opening locking block in the clamping cavity rotates from the initial positions of 30° and 210° with the positioning sleeve to the positions of 0° and 180° and presses tightly against the inner surface of the trapezoidal boss in the baffle to lock the opening safely. This eliminates the risk of being squeezed by the sling when unloading the sling by manually pressing the baffle.

[0019] The beneficial technical effects of the present invention are as follows:

[0020] This invention enables automatic sling attachment and automatic hook closure; it also enables closed-end safety locking, preventing sling detachment accidents caused by spring fatigue failure preventing the baffle from closing the hook; and it enables open-end safety locking, eliminating the risk of injury from sling crush when manually pressing the baffle to remove the sling. Attached Figure Description

[0021] Figure 1 This is the front view of the present invention.

[0022] Figure 2 yes Figure 1 Top view.

[0023] Figure 3 This is the front view of the lower clamp.

[0024] Figure 4 yes Figure 3 Top view.

[0025] Figure 5 This is the main view of the upper clamp.

[0026] Figure 6 yes Figure 5 Top view.

[0027] Figure 7 This is the main view of the positioning cover.

[0028] Figure 8 yes Figure 7 The left view.

[0029] Figure 9 yes Figure 7 Top view.

[0030] Figure 10 This is a top view of the positioning sleeve.

[0031] Figure 11 This is a schematic diagram of the positioning sleeve unfolded from the front view.

[0032] Figure 12 This is a top-view diagram of the positioning sleeve unfolded.

[0033] Figure 13 This is the front view of the base.

[0034] Figure 14 yes Figure 13 Top view.

[0035] Figure 15 This is a bottom view of the baffle.

[0036] Figure 16 This is the front view of the baffle.

[0037] Figure 17 This is the main view of the toggle lever assembly.

[0038] Part number descriptions in the diagram: 1. Lower clamp, 1-1. Conical chamfer; 2. Bolt pair; 3. Positioning cover, 3-1. Positioning groove, 3-1-1. Positioning stop hole, 3-2. Baffle slot hole; 3-4. Top ring plate, 3-4-1. Fixing groove I; 3-5. Outer cylinder column; 4. Upper clamp, 4-1. Positioning block, 4-1-1. Rectangular insert groove, 4-1-2. Positioning boss; 5. Positioning sleeve, 5-1. Opening locking block, 5-2. Closing locking block, 5-3. Lever connecting seat, 5-4. Cylindrical base, 5-4-1. C-shaped cut; 6. Base, 6-1. Mounting lug, 6-2. Baffle live 6-3. Moving opening slot; 6-3. Inner cylinder column; 6-3-1. Fixed groove II; 6-4. Bottom ring plate; 7. Pin shaft; 8. Spring; 9. Baffle; 9-1. Baffle base plate; 9-1-1. Trapezoidal boss; 9-2. Baffle side upright plate; 9-2-1. Pin hole; 10. Lever; 10-1. Screw; 10-2. Sleeve; 10-3. Cotter pin; 11. Clamping cavity; 12. Hook handle; 13. Sling; 14. Hook cavity; A. Automatic opening and closing position; B. Closed locking position; C. Opening locking position; A'. Automatic opening and closing state of the baffle; B'. Closed locking state of the baffle; C'. Opening locking state of the baffle. Detailed Implementation

[0039] The present invention will be further described below with reference to the accompanying drawings:

[0040] like Figures 1 to 17 As shown, the present invention provides a hook anti-derailment device capable of safe locking and preventing crushing injuries, comprising, from bottom to top, a lower clamp 1, a base 6, and an upper clamp 4 (the base 6 is securely mounted on the hook handle 12 by the supporting action of the lower clamp 1 and the pressing action of the upper clamp 4), a positioning sleeve 5 that is looped around the outer surface of the base, and a positioning cover 3 that is fastened above the base 6 and combined with the base 6 to form a clamping cavity 11 (the positioning cover 3 is fixedly mounted on the base 6 by the supporting action of the base 6 and the positioning action of the upper clamp 4; the clamping cavity 11 is used to install the positioning sleeve 5), symmetrically hinged to the outer surface of the base by a spring 8 and a pin 7. 0 and 180 0A baffle 9, located at the center height position and capable of rotating, opening, closing, and locking safely within the hook cavity 14 (this invention uses a spring 8 in conjunction with the baffle 9, providing automatic sling hanging and automatic hook opening closure functions; this invention uses a closing locking block 5-2 in conjunction with the baffle 9, enabling closed-end safety locking and preventing the sling from falling off the hook due to spring fatigue failure; this invention uses an opening locking block 5-1 in conjunction with the baffle 9, enabling open-end safety locking and eliminating the risk of injury from the sling 13 when manually pressing the baffle 9 to remove it), is installed at the center height position of the positioning sleeve 5 via a threaded connection and horizontal extension, and is capable of horizontal rotation for three-position switching (the lever 10 can drive the positioning sleeve 5 to rotate and flexibly switch between three positions: automatic opening / closing, closing / locking, and opening / locking, as needed); the positioning sleeve 5 includes a cylindrical base 5-4, and is set on the outer surface 30 of the cylindrical base. 0 and 210 0 The opening locking block 5-1, located at the upper-middle position, is set on the outer surface of the cylindrical base at 155°. 0 and 335 0 The closing locking block 5-2, located at the lower-middle position, is set on the outer surface of the cylindrical base at 90 degrees. 0 A lever connecting seat 5-3 with internal threads is located at the center height position of the orientation (the cylindrical base 5-4 is the mounting base for the opening locking block 5-1, the closing locking block 5-2, and the lever connecting seat 5-3; the opening locking block 5-1 cooperates with the baffle 9 to achieve safe locking of the opening; the closing locking block 5-2 cooperates with the baffle 9 to achieve safe locking of the closing; the lever connecting seat 5-3 is used to connect the lever 10); the positioning cover 3 is welded from the top ring plate 3-4 and the outer cylinder column 3-5, at 90 degrees of the outer cylinder column 3-5. 0 A positioning groove 3-1 (serving as a rotating sliding track for the lever 10) is machined at the center height position. At the 60° of the positioning groove 3-1... 0 Direction, 90 0 Direction, 107 0 Positioning holes 3-1-1 and 90 are provided in all directions. 0 Positioning hole 3-1-1 is for automatic opening / closing position A, which is the initial position of lever 10, used when attaching slings; 107 0 The directional positioning hole 3-1-1 is the closed locking stop B, which is used after the sling is hooked into the hook cavity 14 and the hook opening automatically closes; 60 0 The locating stop hole 3-1-1 is an open locking stop C (used when unloading the sling), located at 0 on the outer cylinder 3-5. 0 Orientation and 180 0A downward-facing, open baffle slot 3-2 is machined at the lower-middle position of the baffle 9 (to prevent motion interference when the baffle 9 rotates open and closes); the baffle 9 is composed of a baffle base plate 9-1 and baffle side uprights 9-2 perpendicular to both sides of the baffle base plate (the baffle side uprights 9-2, when used with the closing locking block 5-2, can achieve a closed safety lock). Pin holes 9-2-1 for inserting the pin shaft 7 are machined at the larger ends of the two baffle side uprights 9-2. A trapezoidal boss 9-1-1 extends outward from the pin hole end of the baffle base plate 9-1 (the trapezoidal boss 9-1-1, when used with the opening locking block 5-1, can achieve an opening safety lock); when the lever 10 is at 90 degrees of the positioning groove 3-1... 0 When the automatic opening / closing position A is engaged, the baffle 9 rotates freely under the external force of the sling 13, opening the hook opening and allowing the sling 13 to enter the hook cavity 14. After the external force disappears, the baffle 9 automatically closes the hook opening under the rebound action of the spring 8. When the lever 10 rotates horizontally to position 107 of the positioning slide groove 3-1... 0 When the directional locking position is closed (B), the locking block 5-2 in the clamping cavity 11 rotates together with the positioning sleeve 5 and is tightly pressed against the inner end face of one of the side upright plates 9-2 of the baffle 9 for a closed safety lock; when the lever 10 rotates horizontally to 60 degrees of the positioning slide groove 3-1... 0 When the opening is locked at position C, the opening locking block 5-1 in the clamping cavity 11 rotates together with the positioning sleeve 5 and is tightly pressed against the inner surface of the trapezoidal boss 9-1-1 in the baffle 9 to achieve safe locking of the opening.

[0041] The closing locking block 5-2 described in this invention is made from a trapezoidal thick steel plate. The bottom plane of the trapezoidal thick steel plate is machined into an arc surface that matches the outer surface of the cylindrical base 5-4. The top surface of the small end of the trapezoidal column is machined into a slope that matches the slope of the inner end face of the two side plates 9-2 of the baffle in the closed safety locking state (to facilitate the use of the closing locking block 5-2 and the side plates 9-2 of the baffle 9, to achieve closed safety locking, and to avoid the sling falling off the hook due to spring fatigue failure causing the baffle to fail to close the hook). The opening locking block 5-1 is made from a fan-shaped thick steel plate. The fan-shaped thick steel plate is machined into an arc surface whose inner ring surface matches the outer surface of the cylindrical base 5-4, and the outer surface is an involute arc surface that gradually decreases clockwise. The thickness of the large end of the arc surface is equal to the distance between the inner surface of the trapezoidal boss 9-1-1 and the outer surface of the cylindrical base 5-4 when the baffle 9 is rotated to the opening safety locking position (to facilitate the use of the opening locking block 5-1 and the trapezoidal boss 9-1-1 in the baffle 9, to achieve opening safety locking, and to eliminate the hidden danger of being squeezed by the sling 13 when manually pressing the baffle 9 to remove the sling 13 in the traditional way); the maximum distance from the opening locking block 5-1 and the closing locking block 5-2 to the outer surface of the cylindrical base 5-4 is less than the thickness of the clamping cavity 11 (to ensure that the opening locking block 5-1 and the closing locking block 5-2 can rotate smoothly with the cylindrical base 5-4 in the clamping cavity 11); two C-shaped cuts 5-4-1 are opened on the cylindrical base 5-4, and the two C-shaped cuts 5-4-1 are respectively at 90° to the cylindrical base 5-4. 0 Direction, 107 0 Starting from the lower end face of the orientation, the cut is made by cutting upward along the clockwise slope, then horizontally along the clockwise direction, and then downward after passing through the left semi-circular arc transition to the lower end face of the cylindrical base 5-4. (The C-shaped cut 5-4-1 can effectively prevent the cylindrical base 5-4 in the positioning sleeve 5 from interfering with the installation ear 6-1 in the base 6 during rotation.)

[0042] In this invention, both the lower clamp 1 and the upper clamp 4 are formed by interlocking two semi-cylinders and connecting them into one piece using bolt pairs 2 (both the lower clamp 1 and the upper clamp 4 are clamped together by bolt pairs 2). The bolt pairs 2 are connected to the lower clamp 1 and the upper clamp 4 at 90 degrees. 0 and 270 0 At the location (offset from the installation position of baffle 9 to avoid movement interference); a conical chamfer 1-1 is machined around the upper end face of the lower clamp 1 (the conical chamfer 1-1 facilitates the clamping and positioning between the base 6 and the lower clamp 1); at the 0 of the upper clamp 4 0 and 180 0Each position is provided with a positioning block 4-1 (which simultaneously positions the base 6 and the positioning cover 3, preventing them from rotating and also preventing the positioning cover 3 from moving upwards). The positioning block 4-1 has a rectangular insert groove 4-1-1 machined from top to bottom on the inner side of the cuboid base (for inserting the upper clamp 4), and a positioning boss 4-1-2 is formed on the inner side after removing a rectangular block from bottom to top on the outer side of the cuboid base (which simultaneously inserts into the fixing groove II 6-3-1 of the base 6 and the fixing groove I 3-4-1 of the positioning cover 3, for positioning the base 6 and the positioning cover 3); the 0 ring inside the top ring plate 3-4 0 Orientation and 180 0 Fixed grooves Ⅰ3-4-1 are provided at all positions. The width of the fixed grooves Ⅰ3-4-1 matches the thickness of the positioning boss 4-1-2. The depth of the fixed grooves Ⅰ3-4-1 is less than the length of the positioning boss 4-1-2 (fixed grooves Ⅰ3-4-1 are used to insert the positioning boss 4-1-2 of the positioning block 4-1 in the upper clamp 4. The two are used together to prevent the positioning cover 3 from rotating and to prevent the positioning cover 3 from moving upward).

[0043] The base 6 described in this invention is assembled and welded from a bottom ring plate 6-4 and an inner cylinder column 6-3, with the outer cylinder column 3-5 at 0. 0 Orientation and 180 0 The ear bracket 6-1 is fixedly installed at the center height position (the ear bracket 6-1 cooperates with the pin 7 to hinge the baffle 9 to the base 6), and the bottom ring plate 6-4 is at the 0 0 Orientation and 180 0 A baffle movable opening slot 6-2 is provided at the azimuth position (to prevent motion interference when the baffle 9 rotates and opens), and a 0-shaped opening slot is provided at the upper end of the inner cylinder column 6-3. 0 Orientation and 180 0 A fixing groove II 6-3-1 is provided at the orientation (the fixing groove II 6-3-1 is used to insert the positioning boss 4-1-2 of the positioning block 4-1 in the upper clamp 4, and the two are used together to prevent the base 6 from rotating).

[0044] The lever 10 described in this invention is composed of a screw 10-1, a sleeve 10-2 fitted onto the screw, and a cotter pin 10-3. (When shifting gears, first remove the cotter pin 10-3, pull the sleeve 10-2 backward to lengthen the lever 10, making it easier to rotate the lever 10 horizontally to the desired gear. After the lever 10 reaches the corresponding gear, push the sleeve 10-2 forward and re-fit it completely onto the screw 10-1, ensuring that the large-diameter section of the outer surface of the sleeve 10-2 in the lever 10 is precisely engaged in the positioning stop hole 3-1-1 for gear locking. Then, insert the cotter pin 10-3 into the cotter pin hole at the rear end of the screw 10-1 to limit the forward and backward movement of the sleeve 10-2.) The screw 10-1 is a three-tiered column structure, larger in the middle and smaller at both ends. The front end of the stepped column is machined with an external thread that matches the internal thread of the lever connecting seat 5-3 (the lever 10 is quickly connected to the positioning sleeve 5 via a threaded connection). The diameter of the middle section of the three-step column is smaller than the width of the positioning groove 3-1 (to facilitate the lever 10 to pass through the positioning groove 3-1). The diameter of the rear end section of the three-step column matches the inner cavity of the sleeve 10-2 with a clearance fit (to facilitate the sleeve 10-2 to be fitted onto the screw 10-1). A cotter pin hole is machined at the tail of the rear end section of the three-step column (for inserting the cotter pin 10-3). The sleeve 10-2 is a hollow cavity column structure with a two-step column outer surface. The large diameter section of the outer surface of the sleeve 10-2 matches the inner diameter of the positioning stop hole 3-1-1 with a clearance fit (to facilitate the lever 10 to lock the position).

[0045] The spring 8 described in this invention is a torsion spring (when the sling is attached, the lever 10 is rotated horizontally to 90 degrees of the positioning groove 3-1). 0 At the initial position, the automatic opening and closing stop A is engaged. Under the external force of the sling 13, the spring 8 is compressed, causing the baffle 9 to rotate freely and open the hook opening, allowing the sling 13 to enter the hook cavity 14. After the external force disappears, the baffle 9 automatically closes the hook opening under the rebound action of the spring 8, thus enabling the invention to have the functions of automatic sling hanging and automatic hook opening closing. Cotter pin holes are machined at both ends of the pin 7 (for inserting cotter pins to limit the horizontal movement of the pin 7).

[0046] In this invention, the baffle slot 3-2 is a U-shaped hole, and the width of the baffle slot 3-2 is greater than the width of the baffle 9 (to avoid motion interference when the baffle 9 is rotated and opened).

[0047] The specific uses of this invention are as follows:

[0048] Before using this invention, first assemble it according to the relative assembly relationships shown in the above structural description and accompanying drawings. After assembly, the invention can be put into normal use.

[0049] When attaching the sling, first remove the cotter pin 10-3, then pull the sleeve 10-2 backward to extend the lever 10. Hold the sleeve 10-2 and rotate the lever 10, turning the lever 10 horizontally to 90 degrees of the positioning groove 3-1. 0 After the automatic opening and closing position A is reached at the initial orientation, the sleeve 10-2 is pushed forward and fully re-installed onto the screw 10-1, ensuring that the large-diameter section of the outer surface of the sleeve 10-2 in the lever 10 is precisely engaged in the positioning stop hole 3-1-1 for locking. Then, the cotter pin 10-3 is inserted into the cotter pin hole at the rear end of the screw 10-1. At this time, under the external force of the sling 13, the baffle 9 rotates freely to open the hook opening, allowing the sling 13 to enter the hook cavity 14. After the external force disappears, the baffle 9 automatically closes the hook opening under the rebound action of the spring 8, thus enabling the invention to have automatic sling hanging and automatic hook opening closing functions.

[0050] After the sling is engaged in the hook cavity 14 and the hook opening automatically closes, first remove the cotter pin 10-3, then pull the sleeve 10-2 backward to extend the lever 10. Hold the sleeve 10-2 and rotate the lever 10, turning the lever 10 horizontally to position 107 of the positioning groove 3-1. 0 After closing and locking at position B, push the sleeve 10-2 forward and re-install it completely onto the screw 10-1, ensuring that the large-diameter section of the outer surface of the sleeve 10-2 in the lever 10 is precisely engaged in the positioning stop hole 3-1-1 for locking. Then, insert the cotter pin 10-3 into the cotter pin hole at the rear end of the screw 10-1. Simultaneously, the closing and locking block 5-2 located in the clamping cavity 11 rotates from its initial orientation of 155° and 335° along with the positioning sleeve 5 and tightly presses against the inner end face of one of the side upright plates 9-2 of the baffle 9 for a closed and safe locking. This prevents the sling from falling off the hook due to spring fatigue failure, which could cause the baffle to fail to close the hook and result in a detachment accident.

[0051] When unloading the sling, first remove the cotter pin 10-3, then pull the sleeve 10-2 backward to extend the lever 10, and rotate the lever 10 horizontally to 60 degrees of the positioning groove 3-1. 0 After the opening is locked at the designated position, the sleeve 10-2 is pushed forward and fully re-installed onto the screw 10-1, ensuring that the large-diameter section of the outer surface of the sleeve 10-2 in the lever 10 is precisely engaged in the positioning hole 3-1-1 for locking. Then, the cotter pin 10-3 is inserted into the cotter pin hole at the rear end of the screw 10-1. Simultaneously, the opening locking block 5-1 in the clamping cavity 11 rotates from its initial positions of 30° and 210° with the positioning sleeve 5 to positions of 0° and 180°, and is tightly pressed against the inner surface of the trapezoidal boss 9-1-1 in the baffle 9 for secure locking of the opening. This eliminates the risk of injury from the sling 13 when manually pressing the baffle 9 to remove it.

Claims

1. A hook anti-detachment device capable of safe locking and preventing crushing injuries, characterized in that: The hook anti-detachment device includes, from bottom to top, a lower clamp (1), a base (6), and an upper clamp (4) that are sequentially fitted onto the hook handle (12) and pressed together; a positioning sleeve (5) that is looped around the outer surface of the base; a positioning cover (3) that is fastened above the base (6) and combined with the base (6) to form a clamping cavity (11); a baffle (9) that is symmetrically hinged to the outer surface of the base at the 0° and 180° center height positions by springs (8) and pins (7) and can rotate, open, close, and lock safely within the hook cavity (14); and a lever (10) that is installed at the center height position of the positioning sleeve (5) by threaded connection and horizontal extension and can rotate horizontally to switch between three gears; the positioning sleeve (5) includes a cylindrical base. (5-4) An opening locking block (5-1) is set at the upper middle position of the outer surface of the cylindrical base at 30° and 210°, a closing locking block (5-2) is set at the lower middle position of the outer surface of the cylindrical base at 155° and 335°, and a lever connecting seat (5-3) with internal threads is set at the center height position of the outer surface of the cylindrical base at 90°; The positioning cover (3) is welded from the top ring plate (3-4) and the outer cylinder column (3-5). A positioning groove (3-1) is machined at the center height position of the outer cylinder column (3-5) at 90°, and positioning stop holes (3-1-1) are opened at the 60°, 90° and 107° positions of the positioning groove (3-1). The outer cylindrical column (3-5) has downward-facing open baffle slots (3-2) at the lower middle positions of the 0° and 180° positions; the baffle (9) is composed of a baffle base plate (9-1) and baffle side uprights (9-2) perpendicular to both sides of the baffle base plate. The large ends of the two baffle side uprights (9-2) are machined with pin holes (9-2-1) for inserting pin shafts (7). The baffle base plate (9-1) extends outward from the pin hole end with a trapezoidal boss (9-1-1); when the lever (10) is in the automatic opening and closing position at the 90° position of the positioning slide groove (3-1), the baffle (9) rotates freely under the external force of the sling (13) to open the hook mouth, allowing the sling (13) to enter the hook cavity (14). After the force disappears, the baffle (9) automatically closes the hook under the rebound action of the spring (8); when the lever (10) rotates horizontally to the 107° position of the positioning slide (3-1) and closes, the closing locking block (5-2) in the clamping cavity (11) rotates together with the positioning sleeve (5) and is tightly pressed against the inner end face of the baffle side plate (9-2) in the baffle (9) for closing safety locking; when the lever (10) rotates horizontally to the 60° position of the positioning slide (3-1) and opens, the opening locking block (5-1) in the clamping cavity (11) rotates together with the positioning sleeve (5) and is tightly pressed against the inner surface of the trapezoidal boss (9-1-1) in the baffle (9) for opening safety locking.

2. The hook anti-detachment device capable of safe locking and preventing crushing injury according to claim 1, characterized in that: The closed locking block (5-2) is made of trapezoidal thick steel plate. The bottom plane of the trapezoidal thick steel plate is machined into an arc surface that matches the outer surface of the cylindrical base (5-4). The top surface of the small end of the trapezoidal column is machined into a slope that matches the slope of the inner end face of the two baffle side plates (9-2) in the closed safety locking state. The open locking block (5-1) is made of fan-shaped thick steel plate. The fan-shaped thick steel plate is machined into an arc surface whose inner ring surface matches the outer surface of the cylindrical base (5-4). The outer surface is an involute arc surface that gradually decreases clockwise. The thickness of the large end of the involute arc surface is equal to the thickness of the trapezoidal convex end when the baffle (9) rotates to the open safety locking position. The distance between the inner surface of the platform (9-1-1) and the outer surface of the cylindrical base (5-4); the maximum distance between the opening locking block (5-1) and the closing locking block (5-2) and the outer surface of the cylindrical base (5-4) is less than the thickness of the clamping cavity (11); two C-shaped cuts (5-4-1) are opened on the cylindrical base (5-4). The two C-shaped cuts (5-4-1) are respectively made from the lower end face of the cylindrical base (5-4) at 90° and 107° as the starting position, and cut upward along the clockwise slope, then horizontally along the clockwise direction, and after passing through the left semi-circular arc transition, cut downward to the lower end face of the cylindrical base (5-4) to form the cut.

3. The hook anti-detachment device capable of safe locking and preventing crushing injury according to claim 1, characterized in that: The lower clamp (1) and upper clamp (4) are both made of two semi-cylinders that are interlocked and connected as a whole by bolt pairs (2). The bolt pairs (2) are connected at the 90° and 270° positions of the lower clamp (1) and upper clamp (4). A conical chamfer (1-1) is machined on the upper end face of the lower clamp (1). A positioning block (4-1) is set at the 0° and 180° positions of the upper clamp (4). The positioning block (4-1) is located on the long... A rectangular insert groove (4-1-1) is machined from top to bottom on the inner side of the cuboid base, and a positioning boss (4-1-2) is formed on the inner side after removing a rectangular block from bottom to top on the outer side of the cuboid base; a fixing groove I (3-4-1) is provided at the 0° and 180° positions of the inner ring of the top ring plate (3-4), and the width of the fixing groove I (3-4-1) matches the thickness of the positioning boss (4-1-2).

4. A hook anti-detachment device capable of safe locking and preventing crushing injuries according to claim 1, characterized in that: The base (6) is welded together from the bottom ring plate (6-4) and the inner cylinder column (6-3). The ear seat (6-1) is fixedly installed at the midpoint height of the outer cylinder column (3-5) at the 0° and 180° positions. The bottom ring plate (6-4) has a baffle movable opening slot (6-2) at the 0° and 180° positions. The inner cylinder column (6-3) has a fixing groove II (6-3-1) at the 0° and 180° positions along the upper edge of the inner cylinder column (6-3).

5. A hook anti-detachment device capable of safe locking and preventing crushing injuries according to claim 1, characterized in that: The lever (10) is composed of a screw (10-1), a sleeve (10-2) fitted on the screw, and a cotter pin (10-3). The screw (10-1) is a three-step column structure with a larger middle section and smaller ends. The front end of the three-step column is machined with an external thread that matches the internal thread of the lever connecting seat (5-3). The diameter of the middle section of the three-step column is smaller than the width of the positioning groove (3-1). The diameter of the rear end section of the three-step column matches the inner cavity of the sleeve (10-2) with clearance fit. A cotter pin hole is machined at the tail end of the rear end section of the three-step column. The sleeve (10-2) is a hollow cavity column structure with a two-step column outer surface. The large diameter section of the outer surface of the sleeve (10-2) matches the inner diameter of the positioning stop hole (3-1-1) with clearance fit.

6. A hook anti-detachment device capable of safe locking and preventing crushing injuries according to claim 1, characterized in that: The spring (8) is a torsion spring; cotter pin holes are machined at both ends of the pin (7).

7. A hook anti-detachment device capable of safe locking and preventing crushing injuries according to claim 1, characterized in that: The baffle slot (3-2) is a U-shaped hole, and the width of the baffle slot (3-2) is greater than the width of the baffle (9).

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