Hanging ladder device capable of being folded along with gun and unfolding and folding method of hanging ladder device

Abstract

According to the hanging ladder device capable of being folded along with the gun and the unfolding and folding method of the hanging ladder device, the hanging ladder is arranged in the limited space of the ship gun, and the defects that the space is not enough, and structure arrangement is difficult are overcome; the appearance of the ladder and the appearance of the gun carriage are uniformly designed, the step ladder assembly and the pedal assembly are arranged to form the first-stage step and the second-stage step, the structure is compact after folding, and the concealment is improved. The folding hanging ladder device adopts a one-shaft double-folding structure, is compact in structure, simple to store and easy to operate, makes full use of the existing space of a ship gun, improves the space utilization rate and the climbing comfort of the ship gun, and guarantees the climbing safety of operators.

Description

Technical Field

[0001] The invention belongs to the field of supporting products for weapon systems, and in particular relates to a gun-mounted folding suspension ladder device and an unfolding and folding method of the device. Background Art

[0002] At present, a certain naval gun weapon system uses a suspended ladder for operators to climb and stand during loading, replenishing and daily maintenance of the automatic machine, and carries the operators to perform operations such as loading and replenishing. When the ship shakes and swings, the suspended ladder will also swing with it, which has a great impact on the operators and is highly dangerous. In addition, the installation and disassembly process of the existing suspended ladder is long, it is difficult to store, and it occupies a large space.

[0003] Therefore, it is necessary to design an easy-to-store fixed ladder device on the side of the gun ammunition box for operators to climb and stand on, so as to ensure the safe standing of operators when loading, replenishing ammunition and maintaining automatic machines, so as to reduce the impact of the shaking and swinging of the ship on the operator's work. The storage of the ladder device is beneficial to the work safety during the operation of the gun.

[0004] Therefore, it is very necessary to design a gun-mounted folding suspension ladder device and an unfolding and folding method of the device. Summary of the invention

[0005] The purpose of the present invention is to solve the problems of the prior art such as high risk, difficult storage, long disassembly process and large space occupation, and to provide a gun-mounted foldable suspension ladder device and an unfolding and folding method of the device.

[0006] To achieve the above purpose, the technical solution provided by the present invention is:

[0007] The special features of the gun-mounted folding ladder device are:

[0008] It includes a bracket assembly, a pedal assembly, a step ladder assembly, a locking assembly and two rotating shafts;

[0009] The two rotating shafts are coaxial and are respectively arranged at two ends of the bracket assembly;

[0010] The two ends of the pedal assembly and the step ladder assembly are respectively connected to two rotating shafts, so that the pedal assembly and the step ladder assembly rotate around the rotating shafts;

[0011] The bracket assembly is provided with a limiting device to limit the circumferential position of the step ladder assembly and the pedal assembly, so as to ensure that when the step ladder assembly and the pedal assembly are unfolded, they form a first step and a second step respectively, and match the shape of the naval gun;

[0012] The locking assembly is arranged on the bracket assembly. When the pedal assembly and the step-ladder assembly are folded, the locking assembly locks the pedal assembly and the step-ladder assembly on the bracket assembly.

[0013] Further,

[0014] The bracket assembly includes an upper connecting plate, a vertical plate, a locking seat plate, a pressing block, a supporting block, two side plates and two first rotating shaft seats;

[0015] The upper connecting plate is a strip plate, provided with a horizontal row of threaded holes matching the gun mount, and used to fix the bracket assembly to the gun mount;

[0016] The vertical plate is an inverted "U"-shaped plate, including a long plate and two short plates; the long plate is provided with vertically arranged threaded holes matching with the gun mount, and used to fix the bracket assembly to the gun mount; the two short plates are arranged on both sides of the long plate, and the short plates are provided with mounting holes for mounting the lock seat plate;

[0017] The two side plates are vertically arranged on both sides of the upper connecting plate; the lower end of the side plate is provided with a coaxial first rotating shaft hole for installing the rotating shaft, and the upper end of the side plate is provided with a mounting hole for installing the lock seat plate;

[0018] The first rotating shaft seat is an annular boss with a central through hole in it; the two first rotating shaft seats are coaxially mounted on the outer end surfaces of the two first rotating shaft holes and have the same size as the central through hole, and are used to improve the bearing capacity of the side plate on the rotating shaft;

[0019] The lock base plate is a rectangular plate, one end of which extends out of the mounting holes of the vertical plate and the side plate and is welded and fastened to the side plate and the vertical plate, and the other end is used to connect the locking assembly;

[0020] The pressing block and the supporting block are arranged on the inner side of the side plate, the pressing block limits the unfolded state of the pedal assembly, and the supporting block limits the unfolded state of the step ladder assembly.

[0021] Further,

[0022] The pedal assembly comprises a pedal and two pedal shaft seats;

[0023] The pedal shaft seat is provided with a second shaft hole for mounting the rotating shaft; the two pedal shaft seats are fastened on both sides of the pedal;

[0024] The outer end surface of the pedal shaft seat is flush with the side end surface of the pedal, ensuring that when the pedal rotates around the bolt axis, the side plate limits the side end surface of the pedal.

[0025] Further,

[0026] The step ladder assembly is a square frame, including a cross beam, a left support, a step beam, a right support and two step ladder shaft seats; the cross beam, the left support, the step beam and the right support are long connecting plates;

[0027] The upper ends of the left support and the right support are provided with a coaxial fourth rotating shaft hole for installing the rotating shaft; the step ladder rotating shaft seat is an annular cone with a third rotating shaft hole at the center, and the two step ladder rotating shaft seats are respectively fixed on the inner end surfaces of the two fourth rotating shaft holes and have the same size, so as to improve the bearing capacity of the step ladder assembly on the rotating shaft.

[0028] Further,

[0029] The rotating shaft includes a bolt shaft and a limiting nut;

[0030] The bolt shaft passes through the side plate, the pedal assembly and the step ladder assembly in sequence, and the limit nut is arranged at the tail of the bolt shaft and limits the bolt shaft;

[0031] The head of the bolt shaft is provided with a limiting step, and the size of the limiting step is larger than the size of the third rotating shaft hole.

[0032] Further,

[0033] The side plate, the pressing block and the supporting block are integrally formed.

[0034] Further,

[0035] The lower end of the first rotating shaft seat is flush with the lower end surface of the side plate, which is used to reduce positioning measurement during welding.

[0036] Further,

[0037] The top surface of the cross beam is parallel to the top surface of the tread beam and forms an angle of 30° with the length direction of the left support;

[0038] When in the unfolded state, the left support and the right support are at 150° with the top surface of the vertical plate, matching the shape of the gun mount; when in the folded state, the left support and the right support are in contact with the bottom surface of the pedal.

[0039] The method for unfolding and folding the above-mentioned gun-mounted foldable suspension ladder device is special in that:

[0040] The expansion method comprises:

[0041] Step 1: Unlock the pedal assembly and the step ladder assembly in the folded state so that the pedal assembly and the step ladder assembly can rotate along the rotation axis;

[0042] Step 2: Flip the step ladder assembly outward 150° to the limit position and stop to form the first step;

[0043] Step 3: Flip the pedal assembly outward 90° to the limit position and stop to form the second step, completing the deployment of the foldable ladder device; at this time, personnel can climb the two-step ladder to carry out loading, replenishing and automatic machine maintenance work;

[0044] The folding method comprises:

[0045] Step 1: First, turn the pedal assembly inward 90° to the folded position and stop, then turn the step ladder assembly inward 150° to the folded position and stop;

[0046] Step 2: Use the locking assembly to lock the step ladder assembly to complete the folding of the foldable suspension ladder device.

[0047] The advantages of the present invention are:

[0048] 1. The present invention utilizes the limited space of the naval gun to arrange the suspended ladder, thus overcoming the defects of occupying too much space and difficult structural arrangement; the present invention adopts a one-axis double-folding structure, and forms the first step and the second step by arranging a step ladder assembly and a pedal assembly, which has a compact structure, simple storage, and easy operation, and fully utilizes the existing space of the naval gun to improve concealment; the present invention is designed in a unified manner with the appearance of the gun mount, thereby improving the space utilization rate of the naval gun and the climbing comfort.

[0049] 2. This device only needs to unlock and lock the left lock and the right lock to quickly switch the step ladder assembly and the pedal assembly between the free flipping and folding locking states, so as to realize the rapid unfolding and folding operation of the foldable suspended ladder device. It is simple, convenient, safe and reliable. The unfolding and folding can be completed within 5 seconds, which shortens the disassembly time, ensures the safety of the operator, and improves the work efficiency of the operator.

[0050] 3. This device adopts two steps, in which the tread beam is used as the first step and the pedal is used as the second step, which solves the problem of difficulty in climbing. The weight-reducing hole design of the pedal not only reduces the weight, but also has anti-slip ability, ensuring the safety of operators climbing.

[0051] 4. The device has a one-axis double-folding structure, and the bracket assembly, the step ladder assembly and the pedal assembly are connected by a bolt axis. The parts are easy to replace and the reliability is high, which solves the problem of difficulty in later maintenance and improves the efficiency of later maintenance and support. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 It is a structural schematic diagram of the gun-mounted foldable suspension ladder device in the unfolded state;

[0053] Figure 2 It is a structural schematic diagram of the gun-mounted foldable suspension ladder device in a folded state;

[0054] Figure 3 for Figure 1 A schematic structural diagram of the middle bracket assembly 1;

[0055] Figure 4 for Figure 3 A schematic diagram of the structure of the middle and upper connecting plate 7;

[0056] Figure 5 for Figure 3A schematic structural diagram of the neutral plate 8;

[0057] Figure 6 for Figure 3 A schematic structural diagram of the middle side plate 9;

[0058] Figure 7 for Figure 3 A schematic structural diagram of the transfer shaft seat 10;

[0059] Figure 8 for Figure 3 A schematic structural diagram of the middle lock base plate 11;

[0060] Fig. 9 for Figure 3 A schematic structural diagram of the middle pressure block 12;

[0061] Fig.10 for Figure 3 A schematic structural diagram of the middle support block 13;

[0062] Fig.11 for Figure 1 A schematic diagram of the structure of the middle bolt shaft 2;

[0063] Fig.12 for Figure 1 A schematic structural diagram of the middle pedal assembly 3;

[0064] Fig.13 for Fig.12 A schematic structural diagram of the middle pedal 14;

[0065] Fig.14 for Fig.12 A schematic structural diagram of the middle pedal shaft seat 15;

[0066] Fig.15 for Figure 1 A schematic structural diagram of the middle step ladder assembly 4;

[0067] Fig.16 for Fig.15 A schematic diagram of the structure of the middle cross beam 16;

[0068] Fig.17 for Fig.15 A schematic diagram of the structure of the middle left support 17;

[0069] Fig.18 for Fig.15 A schematic diagram of the structure of the middle step beam 18;

[0070] Fig.19 for Fig.15 A schematic diagram of the structure of the middle right support 19;

[0071] Fig. 20 for Fig.15 A schematic structural diagram of the middle step ladder shaft seat 20;

[0072] Fig.21 for Figure 1 The structural diagram of the middle left lock 5;

[0073] Fig. 22 for Figure 1 A schematic diagram of the structure of the middle right lock 6;

[0074] Fig.23 for Fig.21 A schematic diagram of the structure of the components of the middle left lock 5;

[0075] Fig.24 for Fig. 22 A schematic structural diagram of the right lock seat 27 and the right lock tongue 28 of the middle right lock device 6.

[0076] In the figure: 1-bracket assembly; 2-bolt shaft; 3-pedal assembly; 4-ladder assembly; 5-left locker; 6-right locker; 7-upper connecting plate; 8-vertical plate; 9-side plate; 10-first rotating shaft seat; 11-locking seat plate; 12-pressing block; 13-supporting block; 14-pedal; 15-pedal rotating shaft seat; 16-cross beam; 17-left support; 18-tread beam; 19-right support; 20-ladder rotating shaft seat; 21-locking rod; 22-eccentric block; 23-locking spring; 24-positioning rod; 25-left lock seat; 26-left locking tongue; 27-right lock seat; 28-right locking tongue; 101-first step; 102-second step. DETAILED DESCRIPTION

[0077] Embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. The embodiments are exemplary and intended to be used to explain the present invention, but should not be construed as limiting the present invention.

[0078] like Figure 1 , Figure 2 The gun-mounted foldable suspended ladder device shown comprises a bracket assembly 1, a pedal assembly 3, a step ladder assembly 4, a locking assembly and two bolt shafts 2;

[0079] like Figure 3 As shown, the bracket assembly 1 includes an upper connecting plate 7, a vertical plate 8, a side plate 9, a first rotating shaft seat 10, a locking seat plate 11, a pressing block 12 and a supporting block 13;

[0080] like Figure 4 As shown, the upper connecting plate 7 is a strip plate, provided with a horizontal row of threaded holes matching the naval gun mount, for fixing the bracket assembly 1 to the naval gun mount, and the horizontal row of threaded holes in this embodiment has a total of four threaded through holes;

[0081] like Figure 5As shown, the vertical plate 8 is an inverted "U"-shaped plate, including a long plate and two short plates; the long plate is provided with vertically arranged threaded holes for fixing the bracket assembly 1 to the gun mount by bolts; the short plates are arranged on both sides of the long plate, and the short plates are provided with square holes for installing the lock seat plate 11; the vertically arranged threaded holes in this embodiment are provided with a total of five threaded through holes;

[0082] like Figure 6 As shown, two side plates 9 are vertically arranged on both sides of the upper connecting plate 7; a square hole for mounting the lock base plate 11 is provided at the upper end of the side plate 9; and a coaxial first rotating shaft hole for mounting the bolt shaft 2 is provided at the lower end of the side plate 9;

[0083] like Figure 7 As shown, the two first rotating shaft seats 10 are annular bosses, and a central through hole is provided in the annular bosses; the two first rotating shaft seats 10 are coaxially installed on the outer end surfaces of the two first rotating shaft holes and have the same size as the central through hole, thereby increasing the contact area between the side plate 9 and the bolt shaft 2, and being used to improve the bearing capacity of the side plate 9 on the bolt shaft 2; the lower end surface of the first rotating shaft seat 10 is flush with the lower end surface of the side plate 9, which is beneficial to the positioning of the lower end of the first rotating shaft seat 10 and the end surface of the side plate 9, and reduces the positioning measurement during welding.

[0084] like Figure 8 As shown, the lock base plate 11 is a rectangular plate, and mounting holes are provided at both ends of the lock base plate 11; one end of the lock base plate 11 passes through the square hole of the side plate 9 and is welded and fastened to the vertical plate 8, and the other end is used to connect the locking assembly;

[0085] like Figure 1 , Fig. 9 As shown, the pressing block 12 is a rectangular parallelepiped structure; two pressing blocks 12 are welded and fixed on the inner side of the side plate 9; when the pedal assembly 3 is in the unfolded state, the pressing block 12 is close to the upper end surfaces on both sides of the pedal 14, limiting the circumferential position of the pedal 14; when the pedal assembly 3 and the step ladder assembly 4 are both in the unfolded state, the cross beam 16 is close to the lower end surfaces on both sides of the pedal 14 and is limited by the pedal 14; the bottom end surface of the pressing block 12 is provided with a chamfer, and the weld is set on the inner side of the chamfer, which reduces the processing steps after welding and ensures the unfolded state of the pedal 14.

[0086] like Figure 1 , Fig.10 As shown, the support block 13 is a rectangular parallelepiped structure; two support blocks 13 are arranged on the inner side of the side plate 9, and when the pedal assembly 3 is in the unfolded state, they are close to the lower end surfaces on both sides of the pedal 14 to limit the circumferential position of the pedal 14;

[0087] The pressing block 12 and the supporting block 13 jointly limit the circumferential position of the pedal 14, so that the pedal 14 in the unfolded state is turned outward 90°, and the pedal plane position is limited after the pedal 14 is unfolded, so that its state is rotated 90° and its movement is restricted; the distance between the plane where the bottom surface of the pressing block 12 is located and the plane where the top surface of the supporting block 13 is located is equal to the thickness of the pedal, ensuring that the pedal 14 is in a horizontal state and well limited when in the unfolded state;

[0088] The pressing block 12 limits the cross beam 16 in the circumferential direction, so that the step ladder assembly 4 in the unfolded state is turned outward by 150 degrees, and the step beam 18 is in a horizontal state;

[0089] Preferably, the two side plates 9 are integrally formed with the pressing block 12 and the supporting block 13 .

[0090] like Fig.11 As shown, the bolt shaft 2 includes an external hexagonal step bolt, a flat washer, a spring washer, a limit nut and a first cotter pin; the external hexagonal step bolt passes through the first shaft hole, the second shaft hole and the third shaft hole in sequence, so that the pedal assembly 3 and the ladder assembly 4 rotate around the bolt shaft 2; a limit step is provided on the head of the external hexagonal step bolt, and the size of the limit step is larger than the third shaft hole; the limit nut is a hexagonal slotted nut, which cooperates with the external hexagonal step bolt, is arranged at the tail of the bolt shaft 2 and limits the bolt shaft 2 to further prevent loosening;

[0091] The washer composed of the flat washer and the spring washer cooperates with the external hexagonal step bolt to prevent loosening; the first cotter pin is installed in the slot of the slotted nut to prevent the relative rotation of the limit nut and the bolt;

[0092] like Figure 12 to Figure 14 As shown, the pedal assembly includes a pedal 14 and two pedal shaft seats 15;

[0093] The pedal 14 is provided with a plurality of weight-reducing holes, which reduce weight and enhance anti-slip ability, improve safety, and ensure the safety of operators climbing; the pedal shaft seat 15 is provided with a second shaft hole, and two pedal shaft seats 15 are welded on both sides of the pedal 14. The two second shaft holes are coaxial and respectively matched with the bolt shafts 2 at both ends to ensure that the pedal assembly 3 can rotate around the bolt shaft 2;

[0094] In the unfolded state, the top surface of the pedal is circumferentially limited by the pressing block 12, and the bottom surface of the pedal is circumferentially limited by the supporting block 13, and the pedal 14 is kept horizontal, serving as the second step 102 of the device; in the folded state, the top surface of the pedal is in contact with the vertical plate 8; in order to shorten the length of the entire device, the outer end surface of the pedal shaft seat 15 is flush with the side end surface of the pedal 14;

[0095] like Figures 15 to 20As shown, the step ladder assembly 4 includes a crossbeam 16, a left support 17, a tread beam 18, a right support 19 and two step ladder pivot seats 20; the crossbeam 16, the left support 17, the tread beam 18 and the right support 19 are all long connecting plates, which together form a square frame structure; the upper ends of the left support 17 and the right support 19 are respectively provided with coaxial fourth pivot holes for connecting the bolt shaft 2; the step ladder pivot seat 20 is an annular frustum with a third pivot hole in the center, and the two step ladder pivot seats 20 are welded and fixed to the inner end surface of the fourth pivot hole and have the same size, so as to improve the bearing capacity of the step ladder assembly for the bolt shaft 2; the top surface of the crossbeam 16 is parallel to the top surface of the tread beam 18, and forms an angle of 30° with the length direction of the left support, so as to ensure that the tread beam 18 remains horizontal when the step ladder assembly 4 is unfolded.

[0096] In the unfolded state, the top surface of the step beam 18 remains horizontal, serving as the first step 101 of the device; the left support 17 and the right support 19 are 150 degrees with the top surface of the vertical plate, matching the shape of the gun carriage; in the folded state, the left support 17 and the right support 19 are both in contact with the bottom surface of the step;

[0097] like Figure 21 to Figure 24 As shown, the locking assembly includes a left locker 5 and a right locker 6 that are mirror-symmetrical;

[0098] The left lock 5 comprises a lock rod 21, an eccentric block 22, a lock spring 23, a positioning rod 24, a left lock seat 25 and a left lock tongue 26;

[0099] The right lock 6 comprises a lock rod 21, an eccentric block 22, a lock spring 23, a positioning rod 24, a right lock seat 27 and a right lock tongue 28;

[0100] Take the left lock as an example.

[0101] The left lock seat 25 is a rectangular plate with mounting holes at both ends. A square cavity is provided in the width direction of the left lock seat 25, a through hole is provided on the top surface of the cavity, and an opening is provided on the bottom surface of the cavity. The left lock seat 25 is provided with two connecting ears on the top surface of the cavity, and the two connecting ears are provided with coaxial through holes.

[0102] The eccentric block 22 is composed of two parallel and coaxial semicircular plates and a connecting plate. The connecting plate is provided with a locking rod through hole. The two semicircular plates are each provided with an eccentric shaft hole at the same position. A second cotter pin (not shown) is provided in the eccentric shaft hole. The second cotter pin passes through the eccentric shaft hole and the shaft hole of the positioning rod in sequence and is connected to the two connecting ears, so that the eccentric block 22 can rotate around the second cotter pin.

[0103] The lock rod 21 is a step rod, and the step at the end of the lock rod 21 matches with the lock rod through hole and is connected in a dot-and-mortise manner, so that the operator can control the rotation of the eccentric block 22 by turning the lock rod 21;

[0104] The positioning rod 24 is a step rod, the upper end of the positioning shaft 24 is provided with a step, and the lower end of the positioning rod 24 is provided with an axial hole; the lower end of the positioning rod 24 extends out of the through hole on the top surface of the lock seat cavity, and cooperates with the two semicircular plates of the eccentric block 22, and the second cotter pin passes through the axial hole; the upper end of the positioning rod 24 first passes the spring 23 through the positioning rod 24, and is set in the small hole of the left lock tongue 26, and the step at the upper end of the positioning rod 24 is connected to the left lock tongue 26 by a mortise and tenon method to ensure that the positioning rod 24 can drive the left lock tongue 26 to slide;

[0105] The left lock tongue 26 is an inclined lock tongue structure, with a small hole on the top surface, which is connected to the step of the upper end of the positioning rod 24 by mortise and tenon. The size of the small hole is smaller than the cross section of the spring. The top surface after the mortise and tenon connection provides a limiting surface for the lock spring 23; a large hole is provided on the inclined surface at the bottom end of the left lock tongue 26, and the large hole is used to reduce weight; the chamfered inclined surface is facing the pedal 14, which is conducive to the passage of the spiral staircase when it is stored, and the flat surface is conducive to the limiting fixation after the spiral staircase is stored;

[0106] The lock spring 23 passes through the positioning rod 24 and is arranged in the square blind hole cavity. The top surface of the left lock tongue 26 provides a limit surface for one end of the lock spring 23, and the inner cavity of the left lock seat 25 provides a limit surface for the other end of the lock spring 23. The length of the lock spring 23 in the state between the two limit positions of the left lock tongue 26 and the lock seat 25 is less than its natural state length, and has an initial preload.

[0107] like Fig.21 As shown, in the natural state, the left lock 5 is in a locked state, and the left lock tongue 26 extends out of the cavity obliquely to block the pedal 14;

[0108] When locking, the pedal assembly 3 and the step ladder assembly 4 are rotated, the pedal 14 contacts the inclined surface of the left locking tongue 16, and the left locking tongue 26 is pushed to retract until the bottom surface of the pedal passes through and releases the left locking tongue 16; the lock spring 23 extends, pushes out the left locking tongue 16 to clamp the bottom surface of the pedal, and completes the automatic locking;

[0109] When unlocking, the lock rod 21 rotates around the eccentric axis of the eccentric block 22 to drive the eccentric block 22 to rotate, drive the positioning rod 24 and the left lock tongue 26 to move upward, and the lock spring 23 is compressed by the left lock tongue 26. When the left lock tongue 26 completely enters the cavity of the left lock seat 25, unlocking is completed; at this time, the rotation of the pedal assembly 3 and the step ladder assembly 4 is not affected;

[0110] After the lock rod 21 is released, the lock spring 23 stretches and pushes the left lock tongue 26 out of the cavity of the left lock seat 25 until it returns to its original position, and the left lock device 5 enters the locked state again.

[0111] How to install this device:

[0112] 1. The bracket assembly 1 is fixedly connected to the gun mount by bolts provided on the upper connecting plate 7 and the vertical plate 8;

[0113] 2. Place the first shaft hole, the second shaft hole and the third shaft hole in a coaxial position, insert the threaded portion of the external hexagonal step bolt of the bolt shaft 2 outward through the three holes in turn, install a flat washer and a spring washer on one side of the thread, then set and tighten the slotted nut on the tail of the external hexagonal step bolt, and finally install the first cotter pin in the slot of the slotted nut;

[0114] 3. Place the threaded holes of the left locker 5 and the right locker 6 in a coaxial position with the threaded holes of the lock base plate 11, and install the left locker 5 and the right locker 6 on the lock base plate 11 with bolts;

[0115] 4. After assembly, the pedal assembly 3 and the step-ladder assembly 4 can both be rotated to the folded position, and the pedal assembly 3 and the step-ladder assembly 4 can be automatically locked by the locking tongues of the left locker 5 and the right locker 6.

[0116] Method for unfolding the gun-mounted foldable suspension ladder from a folded state:

[0117] 1. Move the lock rod 21 to unlock the left lock 5 and the right lock 6, so that the pedal assembly 3 and the step ladder assembly 4 can rotate along the axis;

[0118] 2. First, turn the step ladder assembly 4 outward 150° to the limit position and stop, then turn the pedal assembly 3 outward 90° to the limit position and stop, and complete the deployment of the foldable suspension ladder device. At this time, personnel can climb the two-step suspension ladder to carry out loading, replenishing and automatic machine maintenance work.

[0119] After the loading, replenishment and automatic machine maintenance of the naval gun are completed, the method of folding the gun-mounted folding ladder device from the unfolded state is as follows:

[0120] 1. First, turn the pedal assembly 3 inwards 90° to the folded position and stop, then turn the step ladder assembly 4 inwards 150° to the folded position and stop;

[0121] 2. The left lock 5 and the right lock 6 automatically lock the step ladder assembly 4 to complete the folding of the foldable suspension ladder device.

[0122] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should be included in the protection scope of the present invention.

Claims

1. The gun-mounted foldable ladder device is characterized by: It includes a bracket assembly, a pedal assembly, a step ladder assembly, a locking assembly and two rotating shafts; The two rotating shafts are coaxial and are respectively arranged at two ends of the bracket assembly; The two ends of the pedal assembly and the step ladder assembly are respectively connected to two rotating shafts, so that the pedal assembly and the step ladder assembly rotate around the rotating shafts; The bracket assembly is provided with a limiting device to limit the circumferential position of the step ladder assembly and the pedal assembly, so as to ensure that when the step ladder assembly and the pedal assembly are unfolded, they form a first step and a second step respectively, and match the shape of the naval gun; The locking assembly is arranged on the bracket assembly. When the pedal assembly and the step-ladder assembly are folded, the locking assembly locks the pedal assembly and the step-ladder assembly on the bracket assembly.

2. The gun-mounted foldable suspension ladder device according to claim 1 is characterized in that: The bracket assembly includes an upper connecting plate, a vertical plate, a locking seat plate, a pressing block, a supporting block, two side plates and two first rotating shaft seats; The upper connecting plate is a strip plate, provided with a horizontal row of threaded holes matching the gun mount, and used to fix the bracket assembly to the gun mount; The vertical plate is an inverted "U"-shaped plate, including a long plate and two short plates; the long plate is provided with vertically arranged threaded holes matching with the gun mount, and used to fix the bracket assembly to the gun mount; the two short plates are arranged on both sides of the long plate, and the short plates are provided with mounting holes for mounting the lock seat plate; The two side plates are vertically arranged on both sides of the upper connecting plate; the lower end of the side plate is provided with a coaxial first rotating shaft hole for installing the rotating shaft, and the upper end of the side plate is provided with a mounting hole for installing the lock seat plate; The first rotating shaft seat is an annular boss with a central through hole in it; the two first rotating shaft seats are coaxially mounted on the outer end surfaces of the two first rotating shaft holes and have the same size as the central through hole, and are used to improve the bearing capacity of the side plate on the rotating shaft; The lock base plate is a rectangular plate, one end of which extends out of the mounting holes of the vertical plate and the side plate and is welded and fastened to the side plate and the vertical plate, and the other end is used to connect the locking assembly; The pressing block and the supporting block are arranged on the inner side of the side plate, the pressing block limits the unfolded state of the pedal assembly, and the supporting block limits the unfolded state of the step ladder assembly.

3. The gun-mounted foldable suspension ladder device according to claim 2 is characterized in that: The pedal assembly comprises a pedal and two pedal shaft seats; The pedal shaft seat is provided with a second shaft hole for mounting the rotating shaft; the two pedal shaft seats are fastened on both sides of the pedal; The outer end surface of the pedal shaft seat is flush with the side end surface of the pedal, ensuring that when the pedal rotates around the bolt axis, the side plate limits the side end surface of the pedal.

4. The gun-mounted foldable suspension ladder device according to claim 3 is characterized in that: The step ladder assembly is a square frame, including a cross beam, a left support, a step beam, a right support and two step ladder shaft seats; the cross beam, the left support, the step beam and the right support are long connecting plates; The upper ends of the left support and the right support are provided with a coaxial fourth rotating shaft hole for installing the rotating shaft; the step ladder rotating shaft seat is an annular cone with a third rotating shaft hole at the center, and the two step ladder rotating shaft seats are respectively fixed on the inner end surfaces of the two fourth rotating shaft holes and have the same size, so as to improve the bearing capacity of the step ladder assembly on the rotating shaft.

5. The gun-mounted foldable suspension ladder device according to claim 4 is characterized in that: The rotating shaft includes a bolt shaft and a limiting nut; The bolt shaft passes through the side plate, the pedal assembly and the step ladder assembly in sequence, and the limit nut is arranged at the tail of the bolt shaft and limits the bolt shaft; The head of the bolt shaft is provided with a limiting step, and the size of the limiting step is larger than the size of the third rotating shaft hole.

6. The gun-mounted foldable suspension ladder device according to claim 2 is characterized in that: The side plate, the pressing block and the supporting block are integrally formed.

7. The gun-mounted foldable suspension ladder device according to claim 2 is characterized in that: The lower end of the first rotating shaft seat is flush with the lower end surface of the side plate, which is used to reduce positioning measurement during welding.

8. The gun-mounted foldable suspension ladder device according to claim 4 is characterized in that: The top surface of the cross beam is parallel to the top surface of the tread beam and forms an angle of 30° with the length direction of the left support; When in the unfolded state, the left support and the right support are at 150° with the top surface of the vertical plate, matching the shape of the gun mount; when in the folded state, the left support and the right support are in contact with the bottom surface of the pedal.

9. The method for unfolding and folding the gun-mounted foldable suspension ladder device according to claim 1 is characterized in that: The expansion method comprises: Step 1: Unlock the pedal assembly and the step ladder assembly in the folded state so that the pedal assembly and the step ladder assembly can rotate along the rotation axis; Step 2: Flip the step ladder assembly outward 150° to the limit position and stop to form the first step; Step 3: Flip the pedal assembly outward 90° to the limit position and stop to form the second step, completing the deployment of the foldable ladder device; at this time, personnel can climb the two-step ladder to carry out loading, replenishing and automatic machine maintenance work; The folding method comprises: Step 1: First, turn the pedal assembly inward 90° to the folded position and stop, then turn the step ladder assembly inward 150° to the folded position and stop; Step 2: Use the locking assembly to lock the step ladder assembly to complete the folding of the foldable suspension ladder device.

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