A pry bar device for operating a back-mounted hatch cover clamping device

Abstract

This invention discloses a pry bar device for operating a back-mounted hatch cover clamp, belonging to the technical field of ship hatch cover operating tools. The device includes a pry bar head with a hexagonal hole inside. A plug is movably fitted inside the right end of the hexagonal hole. A bolt is threaded onto the upper end of the pry bar head, with the lower end of the bolt in contact with the plug. Four hinge blocks are hinged to the left end of the pry bar head, arranged in pairs on the upper and lower sides of the pry bar head. An S-shaped pry bar is hinged to the other end of each hinge block. The S-shaped pry bar has an arc groove inside. This invention effectively avoids the movement space of the back-mounted hatch cover drive chain through the bending design of the S-shaped pry bar, solving the problem of interference between conventional pry bars and chains. Crew members can operate it conveniently while standing on the deck, ensuring reliable locking of the clamp and preventing seawater from entering the cargo hold and causing cargo damage in severe sea conditions. Furthermore, the three plug structures can be adapted to clamps with different interface types, offering strong versatility.

Description

Technical Field

[0001] This invention relates to the field of ship hatch operation tools, specifically to a pry bar device for operating a back-mounted hatch clamp. Background Technology

[0002] Back-loaded hatch covers are a common type of hatch cover for large dry cargo ships and container ships. The clamps are usually installed between the hatch cover panel and the hatch coaming to apply pressure to the hatch cover after it is closed, ensuring the airtightness of the hatch cover and preventing seawater from entering the cargo hold. In the back-loaded hatch cover structure, the clamps and the drive chain of the hatch cover are arranged relatively compactly in space, and their relative positions are relatively close.

[0003] In practical use, crew members need to use pry bar tools to operate the clamps (such as loosening or tightening). However, most existing conventional hatch cover pry bars are straight rods or simple bent rods. Their shape and operating space do not take into account the positional interference between the back-mounted hatch cover clamp and the drive chain. When operators are working on deck, conventional pry bars are prone to mechanical interference with the hatch cover drive chain, which makes it impossible for the pry bar to be correctly placed in the clamp operating position, or to be unable to apply effective force due to the obstruction of the chain during operation.

[0004] The aforementioned interference issues directly prevent crew members from operating the clamps normally and smoothly, which in turn affects the clamping effect and sealing performance of the hatch covers. Under severe sea conditions, if the clamps fail to lock reliably or the sealing force is insufficient due to improper operation, seawater may seep into the cargo hold through the gaps in the hatch covers, causing serious cargo damage accidents such as water immersion, dampness, corrosion, or mold, and even affecting the stability and safety of the ship.

[0005] Therefore, it is necessary to design a special pry bar device that can effectively avoid the movement space of the chain and facilitate the operation of the crew while standing on the deck, taking into account the special structural type of the back-mounted hatch cover clamp and its spatial arrangement with the drive chain. Summary of the Invention

[0006] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a pry bar device for operating a back-mounted hatch cover clamp.

[0007] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: a pry bar device for operating a back-mounted hatch cover clamping device, comprising a pry bar head, a hexagonal hole inside the pry bar head, a plug movably sleeved inside the right end of the hexagonal hole, a bolt threaded inside the upper end of the pry bar head, the lower end of the bolt pressing against the plug, a hinge block hinged to the left end of the pry bar head, an S-shaped pry bar hinged to the other end of the hinge block, four hinge blocks being arranged in pairs opposite each other on the upper and lower sides of the pry bar head, an arc groove inside the S-shaped pry bar, a semi-circular block movably sleeved inside the arc groove, the other end of the semi-circular block being fixedly connected to the side of the pry bar head, two semi-circular blocks being located at the front and rear ends of the pry bar head, the semi-circular blocks and the arc groove enhancing the support force of the S-shaped pry bar on the pry bar head.

[0008] Preferably, the plug includes a first hexagonal insert that is movably fitted inside a hexagonal hole, and the other end of the first hexagonal insert is fixedly connected to a round rod.

[0009] Preferably, the plug includes a second hexagonal insert that is movably fitted inside a hexagonal hole, and a cylinder is movably fitted inside the second hexagonal insert, with a nut block fixedly connected to one end of the cylinder.

[0010] Preferably, the second hexagonal insert has a cavity inside, and the other end of the cylinder is fixedly connected to a ratchet located inside the cavity.

[0011] Preferably, the outer surface of the ratchet is fitted with a beveled block, and the other end of the beveled block is fixedly connected to a rigid spring, the other end of which is fixedly connected to the inner wall of the cavity.

[0012] Preferably, a limiting rod is movably sleeved inside the inclined plate block, and the other end of the limiting rod is fixedly connected to the inner wall of the cavity.

[0013] Preferably, the plug includes a hexagonal cylinder that is movably fitted inside a hexagonal hole, a movable block that is movably fitted inside the hexagonal cylinder, a screw head that is fixedly installed on the side of the movable block, and the other end of the screw head that is located outside the hexagonal cylinder.

[0014] Preferably, a hexagonal frame is fixedly installed inside the left end of the hexagonal cylinder, and the side of the hexagonal frame contacts the side of the movable block.

[0015] Preferably, a flexible spring is fixedly installed on the side of the movable block, and the other end of the flexible spring is fixedly connected to the inner wall of the hexagonal cylinder.

[0016] (III) Beneficial Effects Compared with the prior art, the present invention provides a pry bar device for operating a back-mounted hatch cover clamp, which has the following advantages: 1. This invention employs a combination structure of an S-shaped pry bar and a hinge block, and sets semi-circular blocks at both ends of the pry bar head to reinforce the support with arc grooves. This allows the overall shape of the pry bar and the force application path to effectively avoid the movement space of the drive chain of the back-mounted hatch cover. Compared with existing straight or simple curved pry bars, this device will not mechanically interfere with the chain during operation. Crew members can smoothly insert the plug into the operating hole of the clamp and apply force, thereby ensuring the normal opening, closing and locking of the clamp and improving the reliability of the hatch cover's tightness.

[0017] 2. This invention, through the arrangement of multiple hinged blocks between the pry bar head and the S-shaped pry bar, and the interchangeability of the plug with different forms such as the first hexagonal plug, the second hexagonal plug, or the hexagonal cylinder, allows crew members to complete the operation in a natural standing posture on the cargo hold deck without having to lean out or change their position to avoid the chains. Under severe sea conditions and ship swaying, this design significantly reduces the difficulty of operation and physical burden, ensuring that the clamp can be locked in a timely and complete manner, effectively preventing seawater from entering the cargo hold, thereby avoiding cargo damage caused by water immersion, dampness, mold, or corrosion.

[0018] 3. The plug of the present invention can be adopted as an integral structure of a first hexagonal plug rod and a round rod, a combination structure of a second hexagonal plug rod with a built-in ratchet and a nut sleeve, or a structure with a telescopic screw head installed inside a hexagonal cylinder, and the hexagonal hole and the hexagonal segment of each plug form a circumferential limiting fit. The above-mentioned multiple plug forms enable the same pry bar device to be adapted to different models, manufacturers and wear levels of back-mounted hatch cover clamps. Crew members only need to change the plug, without having to carry multiple special tools, thus improving the versatility of ship spare parts and operational efficiency. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the unfolded structure of the S-shaped crowbar of the present invention; Figure 3 This is a schematic diagram of the structure of the crowbar head of the present invention; Figure 4 This is a side cross-sectional view of the S-shaped pry bar of the present invention; Figure 5 This is a schematic diagram of the S-shaped crowbar of the present invention; Figure 6 This is a schematic diagram of the structure of the present invention 3a; Figure 7 This is a side cross-sectional view of the structure of the present invention 3b; Figure 8 This is a schematic diagram of the inclined card block of the present invention; Figure 9 This is a side cross-sectional view of the structure of the present invention 3b; Figure 10 For the present invention Figure 7 A magnified schematic diagram of the structure at point A in the middle.

[0020] In the diagram: 1. Pry bar head; 2. Hexagonal hole; 3. Plug; 4. Bolt; 5. Hinge block; 6. S-shaped pry bar; 7. Arc groove; 8. Semicircular block; 3a1, First hexagonal insert; 3a2, Round rod; 3b1, Second hexagonal insert; 3b2, Cavity; 3b3, Cylinder; 3b4, Nut sleeve; 3b5, Ratchet; 3b6, Angled locking block; 3b7, Limiting rod; 3b8, Rigid spring; 3c1, Hexagonal cylinder; 3c2, Moving block; 3c3, Hexagonal frame; 3c4, Flexible spring; 3c5, Screw swivel. Detailed Implementation

[0021] In this invention, unless otherwise stated, the directional terms such as "up" and "down" generally refer to the directions shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" generally refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0022] Example 1 according to Figures 1 to 10As shown, an operating pry bar device for a back-mounted hatch clamping device includes a plug 3. The plug 3 adopts an integrated structure of a first hexagonal insert 3a1 and a round rod 3a2, forming an overall "hexagonal rod plus round rod" combination. The material is high-strength alloy steel, which is heat-treated and then precision ground to ensure that it does not deform or break under repeated torsional and impact loads. The outer contour of the first hexagonal insert 3a1 is a regular hexagon, and its opposite side dimensions form a precise clearance fit with the opposite side dimensions of the hexagonal hole 2 opened inside the pry bar head 1, ensuring that the first hexagonal insert 3a1 can slide smoothly into the hexagonal hole 2, but cannot rotate relative to it in the circumferential direction, thereby achieving effective torque transmission. The axial length of 3a1 is designed to be greater than the depth of the hexagonal hole 2, so that its left end slightly protrudes from the hexagonal hole 2 after insertion, which facilitates a smooth transition connection with the round rod 3a2. The round rod 3a2 and one end of the first hexagonal insertion rod 3a1 are fixedly connected by integral forging or friction welding, and the two remain coaxial. The outer diameter of the round rod 3a2 is determined according to the diameter of the operating hole of the target clamp. Users can select round rods 3a2 of different diameters according to the interface size of the actual hatch clamp. The end of the round rod 3a2 is chamfered to facilitate insertion into the operating hole of the clamp. To further increase the friction or to achieve a fit with the grooved interface, the outer surface of the round rod 3a2 can also be knurled or have axial grooves.

[0023] Assembly process: First, the crew selects the plug 3 of this embodiment with a suitable diameter of round rod 3a2 according to the interface type of the back-mounted hatch cover clamp to be operated. Then, the first hexagonal insert 3a1 is aligned with the hexagonal hole 2 from the right end of the pry bar head 1 and slowly pushed in until the left end face of the first hexagonal insert 3a1 is basically flush with or slightly protruding from the left end face of the hexagonal hole 2. At this time, the round rod 3a2 is completely located outside the right side of the pry bar head 1. Next, the crew uses a tool or manually rotates the bolt 4 to press the lower end face of the bolt 4 against one edge or upper plane of the first hexagonal insert 3a1 and applies an appropriate preload force to prevent axial movement and avoid excessive pressure that could damage the inner wall of the hexagonal hole 2 or deform the insert. Finally, the round rod 3a2 is inserted into the operating hole of the back-mounted hatch cover clamp to ensure that the insertion depth is sufficient to ensure stable force transmission. The crew member stands on the cargo hold deck, holding the middle of the S-shaped pry bar 6 with one hand for orientation and gripping the distal handle of the S-shaped pry bar 6 with the other hand. When force is applied, the torque is transmitted sequentially through the S-shaped pry bar 6, the four hinge blocks 5 to the pry bar head 1, and then through the circumferential limiting fit between the hexagonal hole 2 and the first hexagonal insert 3a1 to the round rod 3a2. Finally, the round rod 3a2 drives the rotating part of the clamp to rotate, thereby realizing the locking or unlocking operation of the clamp. During this process, the two semicircular blocks 8 slide relative to each other in the two arc grooves 7 of the S-shaped pry bar 6, sharing part of the bending moment load and effectively preventing the pin of the hinge block 5 from shearing deformation due to excessive force. The breakage is due to the fact that the overall shape of the S-shaped pry bar 6 is "S" shaped and its bending direction and bending radius are precisely designed to completely avoid the motion envelope area of ​​the back-mounted hatch cover drive chain. Therefore, no mechanical interference will occur during operation. This embodiment is particularly suitable for situations where the clamping device operation hole is a cylindrical blind hole or through hole and no unidirectional drive is required. Its advantages are the simplest structure, the lowest manufacturing cost, and the highest reliability. Moreover, the diameter of the round rod 3a2 can be quickly changed according to different ship types or different hatch cover clamping device specifications. For ships with multiple models of hatch covers in the fleet, multiple sets of plugs 3 of this embodiment with different round rod 3a2 diameters can be equipped, making on-site replacement convenient and quick.

[0024] Example 2 like Figures 7 to 10As shown, the plug 3 adopts a combined structure in which a ratchet 3b5 and a nut sleeve 3b4 are movably installed inside the second hexagonal insert 3b1. This structure is ingeniously designed and integrates a one-way transmission mechanism. It is particularly suitable for applications where hexagonal or square nuts are used as the operating interface on back-mounted hatch cover clamps, and where the nut can only rotate in one direction during the tightening process to prevent loosening. For example, some ships' back-mounted hatch cover clamps have a wedge-shaped locking mechanism inside. If the nut reverses during the tightening process, the tightening force may be lost instantly. This embodiment completely eliminates this problem through the ratchet mechanism. The outer contour of the second hexagonal insert 3b1 is also a regular hexagon, and its outer dimensions form a circumference with the hexagonal hole 2. The limiting fit is made of carburized steel, which has good wear resistance after carburizing treatment, while the core maintains sufficient toughness. Unlike embodiment one, the second hexagonal insert 3b1 is not a solid structure. It has a circular cavity 3b2 axially formed inside. The diameter of the cavity 3b2 is more than half the size of opposite sides of the second hexagonal insert 3b1. It is used to accommodate internal components such as cylinder 3b3, ratchet 3b5, inclined block 3b6, limiting rod 3b7, and rigid spring 3b8. The cylinder 3b3 is a thin-walled cylindrical part, and its outer circle forms a sliding fit with the inner wall of the cavity 3b2. The left end of the cylinder 3b3 protrudes from the left end face of the second hexagonal insert 3b1 and is fixedly connected to the nut sleeve 3b4. The nut sleeve 3b4 is a hexagonal or dodecagonal sleeve structure, with its inner hole shape matching the shape of the nut being operated. Magnetic elements can be embedded in the inner wall of the nut sleeve 3b4 to attract the nut and prevent it from falling off during operation. The right end of the cylinder 3b3 extends into the cavity 3b2 and is fixedly connected to a ratchet 3b5. The ratchet 3b5 is an external tooth ratchet with unidirectional sawtooth teeth, and its tooth surface is hardened to achieve high wear resistance. An inclined plate block 3b6 is installed inside the cavity 3b2. The side of the inclined plate block 3b6 facing the ratchet 3b5 has an inclined surface that matches the ratchet tooth shape. This inclined surface remains in contact with the tooth surface of the ratchet 3b5 under the thrust of the rigid spring 3b8. A rigid spring 3b8 is fixedly connected to the back of block 3b6. The rigid spring 3b8 is a compression helical spring made of high-quality spring steel. The other end of the spring is fixedly connected to the inner wall of the rectangular groove of cavity 3b2. The pre-compression of the rigid spring 3b8 ensures that the inclined block 3b6 is always pushed towards the ratchet 3b5. In order to guide the inclined block 3b6 to make precise linear reciprocating motion in the rectangular groove without deflection, an axial through hole is provided inside the inclined block 3b6. A limit rod 3b7 is movably sleeved in the through hole. The limit rod 3b7 is a cylindrical steel rod with its two ends fixed to the left and right side walls of cavity 3b2, respectively. The limit rod 3b7 and the through hole inside the inclined block 3b6 form a sliding fit.

[0025] Ratchet working principle: When the cylinder 3b3 and the nut sleeve 3b4 are subjected to a clockwise driving torque, the ratchet 3b5 rotates clockwise along with the cylinder 3b3. At this time, the inclined surface of the teeth of the ratchet 3b5 pushes the inclined plate block 3b6 to move outward against the elastic force of the rigid spring 3b8, causing the inclined plate block 3b6 to temporarily disengage from the ratchet tooth groove, allowing the ratchet 3b5 to rotate continuously. After the ratchet 3b5 has rotated one tooth, under the pushing force of the rigid spring 3b8, the inclined plate block 3b6 quickly returns to its original position and engages in the next tooth groove. This cycle repeats continuously, achieving unidirectional continuous drive. When attempting to rotate in the opposite direction, the vertical surface of the inclined plate block 3b6 will tightly abut against the tooth surface of the ratchet 3b5, preventing the ratchet 3b5 from rotating in the opposite direction, thereby preventing the nut sleeve block 3b4 from reversing. If it is necessary to release the lock, the crew can gently push the S-shaped pry bar 6 in the axial direction, causing the entire second hexagonal insert 3b1 to produce a small axial displacement relative to the cylinder 3b3, thereby temporarily disengaging the inclined plate block 3b6 from the ratchet 3b5, at which point it can rotate freely in the opposite direction.

[0026] Assembly process: In use, first, the rigid spring 3b8 is placed on the limiting rod 3b7. Then, the through hole of the inclined block 3b6 is aligned with the limiting rod 3b7 and pushed in. Next, both ends of the limiting rod 3b7 are fixed in the rectangular groove of the cavity 3b2. Then, the cylinder 3b3 is inserted into the cavity 3b2, aligning the ratchet 3b5 on the right end of the cylinder 3b3 with the inclined block 3b6. Then, the second hexagonal insert 3b1 is inserted as a whole into the hexagonal hole 2 of the pry bar head 1, and the bolt 4 is tightened for axial fixation. Finally, the nut sleeve 3b4 is placed on the operating nut of the clamping device. This embodiment is particularly suitable for applications where nuts are used for fastening in back-mounted hatch cover clamps and where there are strict requirements for preventing loosening. On older ships with severe vibrations or ships that sail in harsh sea areas for a long time, ordinary sleeves cannot prevent the nuts from loosening due to vibration. This embodiment achieves one-way locking during operation through a built-in ratchet mechanism, which greatly improves the locking reliability of the clamp. At the same time, since the ratchet mechanism is completely built into the second hexagonal plug 3b1, the external dimensions of the entire plug 3 are not significantly increased, and it can still adapt to a compact operating space.

[0027] Example 3 like Figure 9As shown, the plug 3 adopts a telescopic structure in which a screw head 3c5 is movably installed inside a hexagonal cylinder 3c1. This structure is specifically designed for situations where a cross-head or slotted countersunk screw is used as the operating interface on a back-mounted hatch cover clamp, and the screw head is located inside a deep hole or the operating space has inconsistent depths. Through the telescopic design, this embodiment can adapt to the screw position at different depths. At the same time, the screw head 3c5 automatically retracts when not in use, avoiding damage to the head or scratches to the operator due to accidental bumps. The hexagonal cylinder 3c1 is a hollow cylinder with an outer hexagonal cross-section. The dimensions of the opposite sides of its outer hexagonal corners form a circumferential limiting fit with the hexagonal hole 2. The wall thickness of the hexagonal cylinder 3c1 is reasonably designed to ensure sufficient strength. To ensure a comfortable weight without being excessive, the hexagonal cylinder 3c1 is made of tempered steel, which possesses excellent comprehensive mechanical properties. An axially oriented cylindrical cavity is formed inside the hexagonal cylinder 3c1, with a diameter slightly larger than the outer diameter of the moving block 3c2. This ensures smooth axial sliding of the moving block 3c2 within the cavity. The right end of the hexagonal cylinder 3c1 is open, allowing the screw head 3c5 to extend. The left end of the hexagonal cylinder 3c1 is semi-closed, with a hexagonal frame 3c3 fixedly installed inside. The hexagonal frame 3c3 is a thin plate-like part with a central hexagonal hole. Its outer edge is fixed to the inner cavity of the hexagonal cylinder 3c1 via interference fit or welding. The diameter of the central hexagonal hole in the hexagonal frame 3c3 is smaller than the maximum diameter of the moving block 3c2. The large outer diameter of the movable block 3c2 serves as a limiting structure, restricting its maximum rightward movement and preventing it from completely detaching from the right end of the hexagonal cylinder 3c1 along with the screw head 3c5. The movable block 3c2 is a stepped cylinder with a large-diameter section at its left end and a small-diameter section at its right end. The large-diameter section slides into the inner cavity of the hexagonal cylinder 3c1, while the small-diameter section passes through the central hexagonal hole of the hexagonal cylinder 3c3 and extends outward. A connecting hole is located at the center of the right end face of the movable block 3c2 for fixing and installing the screw head 3c5. The screw head 3c5 can be a Phillips head, slotted head, internal hexagon head, or star-shaped head, selected according to the type of the actual clamping screw. The screw head 3c5 is fixed to the moving block 3c2 by a threaded connection or a set screw for easy and quick replacement. The end of the screw head 3c5 can be equipped with a magnetic adsorption function to attract the screw head and prevent the screw from falling off during operation. The flexible spring 3c4 is located in the inner cavity of the hexagonal cylinder 3c1. One end of the flexible spring 3c4 is fixedly connected to the left end face of the moving block 3c2, and the other end is fixedly connected to the left end face of the inner cavity of the hexagonal cylinder 3c1. The flexible spring 3c4 is a relatively soft helical spring. Its natural length pulls the moving block 3c2 to the left end. At this time, the screw head 3c5 is completely retracted into the hexagonal cylinder 3c1 or only a small part is exposed, which makes it easy to insert the entire plug 3 into the hexagonal hole 2 of the pry bar head 1 without interference.

[0028] Operating principle: After the crew inserts the hexagonal tube 3c1 into the hexagonal hole 2 of the pry bar head 1 and tightens the bolt 4, they align the screw head 3c5 with the countersunk screw on the clamp. Since the screw may be located deep under the hatch cover, the crew pushes the entire device towards the screw by hand or with the S-shaped pry bar 6, so that the tip of the screw head 3c5 first contacts the screw head. When pushing continues, the screw head generates a counter-force on the screw head 3c5. This counter-force pushes the moving block 3c2 to overcome the tension of the flexible spring 3c4. The force moves to the right, and simultaneously, the small-diameter section at the right end of the moving block 3c2 slides within the central hole of the hexagonal frame 3c3. The large-diameter section of the moving block 3c2 is blocked by the hexagonal frame 3c3, limiting its maximum extension length and preventing the moving block 3c2 from completely disengaging. When the screw head 3c5 is fully inserted into the screw head slot, the crew rotates the S-shaped pry bar 6. The torque is transmitted to the hexagonal cylinder 3c1 through the hexagonal hole 2, and then through the friction between the moving block 3c2 and the inner cavity of the hexagonal cylinder 3c1, or through the friction between the hexagonal frame 3c3 and the moving block 3c2. The hexagonal fit between the moving blocks 3c2 transmits power to the screw head 3c5, thereby tightening or loosening the screw. After the operation is completed, the axial thrust is removed, and the flexible spring 3c4 automatically pulls the moving blocks 3c2 along with the screw head 3c5 back into the hexagonal cylinder 3c1, preventing the screw head from being exposed and damaged. This embodiment is particularly suitable for back-mounted hatch cover clamps that use countersunk screws and where the screws are located in deep holes. Its biggest advantage is that the telescopic design can adapt to different screw depths, eliminating the need to change screw heads of different lengths or make complex adjustments before operation. At the same time, the automatic retraction function provided by the flexible spring 3c4 greatly improves the convenience and safety of tool storage. In addition, the magnetic adsorption design makes it difficult for the screw to fall off the screw head even in rough sea conditions with hull rolling, significantly improving the success rate and safety of operation. For ships with a large number of screw sizes, multiple moving blocks 3c2 equipped with screw heads 3c5 of different sizes can be equipped, which can be quickly replaced by simple plugging and unplugging, achieving multiple uses with one tool.

[0029] The above are merely specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on the present invention to solve essentially the same technical problems and achieve essentially the same technical effects are all covered within the protection scope of the present invention.

Claims

1. A pry bar device for operating a back-mounted hatch cover clamping device, comprising a pry bar head (1), characterized in that: The pry bar head (1) has a hexagonal hole (2) inside. A plug (3) is movably sleeved inside the right end of the hexagonal hole (2). A bolt (4) is threaded inside the upper end of the pry bar head (1). The lower end of the bolt (4) is pressed against the plug (3). A hinge block (5) is hinged to the left end of the pry bar head (1). An S-shaped pry bar (6) is hinged to the other end of the hinge block (5). There are four hinge blocks (5), and the four hinge blocks (5) are arranged in pairs. The S-shaped pry bar (6) is provided with an arc groove (7) on the upper and lower sides of the pry bar head (1). A semi-circular block (8) is movably sleeved inside the arc groove (7). The other end of the semi-circular block (8) is fixedly connected to the side of the pry bar head (1). There are two semi-circular blocks (8). The two semi-circular blocks (8) are located at the front and rear ends of the pry bar head (1) respectively. The semi-circular blocks (8) and the arc groove (7) strengthen the support force of the S-shaped pry bar (6) on the pry bar head (1).

2. The pry bar device for operating a back-mounted hatch cover clamping device according to claim 1, characterized in that: The plug (3) includes a first hexagonal insert (3a1) that is movably fitted inside the hexagonal hole (2), and a round rod (3a2) is fixedly connected to the other end of the first hexagonal insert (3a1).

3. The pry bar device for operating a back-mounted hatch cover clamping device according to claim 1, characterized in that: The plug (3) includes a second hexagonal insert (3b1) that is movably fitted inside the hexagonal hole (2). A cylinder (3b3) is movably fitted inside the second hexagonal insert (3b1), and a nut block (3b4) is fixedly connected to one end of the cylinder (3b3).

4. The pry bar device for operating a back-mounted hatch cover clamping device according to claim 3, characterized in that: The second hexagonal insert (3b1) has a cavity (3b2) inside, and the other end of the cylinder (3b3) is fixedly connected to a ratchet (3b5) located inside the cavity (3b2).

5. The pry bar device for operating a back-mounted hatch cover clamping device according to claim 3, characterized in that: The ratchet (3b5) has a beveled block (3b6) inserted into its outer beveled surface. The other end of the beveled block (3b6) is fixedly connected to a rigid spring (3b8), and the other end of the rigid spring (3b8) is fixedly connected to the inner wall of the cavity (3b2).

6. The pry bar device for operating a back-mounted hatch cover clamping device according to claim 3, characterized in that: The inclined block (3b6) is internally fitted with a limiting rod (3b7), and the other end of the limiting rod (3b7) is fixedly connected to the inner wall of the cavity (3b2).

7. The pry bar device for operating a back-mounted hatch cover clamping device according to claim 1, characterized in that: The plug (3) includes a hexagonal cylinder (3c1) that is movably fitted inside the hexagonal hole (2). A movable block (3c2) is movably fitted inside the hexagonal cylinder (3c1). A screw head (3c5) is fixedly installed on the side of the movable block (3c2). The other end of the screw head (3c5) is located outside the hexagonal cylinder (3c1).

8. The pry bar device for operating a back-mounted hatch cover clamping device according to claim 7, characterized in that: A hexagonal frame (3c3) is fixedly installed inside the left end of the hexagonal tube (3c1), and the side of the hexagonal frame (3c3) contacts the side of the movable block (3c2).

9. The pry bar device for operating a back-mounted hatch cover clamping device according to claim 7, characterized in that: A flexible spring (3c4) is fixedly installed on the side of the movable block (3c2), and the other end of the flexible spring (3c4) is fixedly connected to the inner wall of the hexagonal cylinder (3c1).

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