Forklift mobile quick-change boom device, forklift and method

Abstract

The present invention relates to a forklift movable quick-change boom device, a forklift and a method, comprising a movably connected boom mechanism and a quick-change mechanism, wherein the boom mechanism comprises two symmetrically arranged boom bodies and a fixed tube; the boom body is a tubular structure formed integrally by a vertical arm and a horizontal arm, wherein the end of the horizontal arm is slidably connected to a movable tube, and a hook is fixed at the center of the movable tube; an upper hook assembly connected to the forklift is fixed on the outer side of the vertical arm. The quick-change mechanism is used to support the boom mechanism, and the quick-change mechanism comprises a bottom frame and a side frame connected together in an L-shaped structure, the vertical arm is mounted on the bottom frame, and the end of the horizontal arm is movably connected to the side frame. In the present application, the hook has the ability to move in the front-back direction, and the side-shifting distance adjustment fork can drive the boom mechanism to move in the left-right direction; when the forklift mast rises and falls, the boom mechanism is driven to move in the up-down direction, thereby achieving multi-directional adjustment of the position of the bag for lifting, and finally achieving transportation by the travel of the forklift.

Description

Technical Field

[0001] The present invention relates to the technical field of forklifts, and in particular to a forklift mobile quick-change boom device, a forklift and a method. Background Art

[0002] With the rapid development of my country's industry, more and more products are exported, requiring the use of equipment such as forklifts and cranes for transport between warehouses and ports. However, due to their physical properties, heavy, bulky, or irregularly shaped goods are difficult to transport using traditional packaging and transportation methods. Therefore, a specialized packaging and transportation method, such as hanging bags, is required. Hanging bags typically have sufficient load-bearing capacity and stability to ensure the safety of goods during transportation.

[0003] Forklifts are currently widely used for handling operations in industries such as electronics, automotive, chemicals, pharmaceuticals, printing, tobacco, and warehousing and logistics. For handling large bags, existing forklift attachments, such as forks, buckets, fork sleeves, booms, and flat clamps, are insufficient. Therefore, it is necessary to design a suitable forklift attachment, such as a boom for lifting bags. Furthermore, the technical challenge we face is to quickly and easily assemble this boom with the forklift and bag. Summary of the Invention

[0004] In view of the above problems, the present invention provides a forklift mobile quick-change boom device, a forklift and a method for quickly transporting bags by a forklift, thereby improving the efficiency of bag lifting operations.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A forklift mobile quick-change boom device includes a movably connected boom mechanism and a quick-change mechanism, the boom mechanism includes two symmetrically arranged boom bodies and a fixed tube connected between the two boom bodies; the boom body is a tubular structure formed integrally by a vertical arm and a horizontal arm, wherein the end of the horizontal arm is slidably connected to a movable tube, and a hook is fixed at the center of the movable tube; the outer side of the vertical arm is fixed with an upper hook assembly connected to the forklift; the quick-change mechanism is used to support the boom mechanism, and the quick-change mechanism includes a bottom frame and a side frame connected together in an L-shaped structure, the vertical arm is mounted on the bottom frame, and the port of the horizontal arm is movably connected to the side frame.

[0007] In a further solution, a driving device is installed on the inner side of the boom body, and the movable end of the driving device is connected to the movable tube to drive the movable tube to move horizontally along the length direction of the horizontal arm.

[0008] In a further solution, the driving device is a cylinder, and cylinder bases are respectively installed at both ends of the movable tube, and the cylinder bases are provided with fixing holes for plugging in the movable ends of the cylinders.

[0009] In a further solution, a connecting plate is fixedly provided on the inner side of the boom body, a U-shaped fixing frame is sleeved on the driving device, and an open end of the U-shaped fixing frame is fixedly connected to the connecting plate.

[0010] Preferably, the U-shaped fixing frame comprises a U-shaped frame, both ends of the open end of the U-shaped frame are fixed with fixing blocks, and the fixing blocks are provided with connecting holes; the inner ring of the U-shaped frame is provided with a rubber pad groove for clamping the rubber pad.

[0011] In a further solution, the ends of the opposite sides of the horizontal arm are provided with slots; rollers are respectively installed at both ends of the movable tube, and the rollers are built into the inner cavity of the horizontal arm and move horizontally along the slots.

[0012] According to a further solution, the upper hook assembly includes a card plate fixed on the vertical arm, the bottom end of the card plate is connected to a hook limit plate through a transition plate, and the hook limit plate is used to mount the side shift and distance adjustment fork of the forklift to achieve the connection; the bottom end of the vertical arm is equipped with a stop block mounting hook, and the stop block mounting hook is equipped with a stop block for limiting the side shift and distance adjustment fork.

[0013] In a further solution, a limit column group is vertically fixed to the end of the bottom frame, and a connecting rod is horizontally fixed to the top of the side frame; the bottom end of the vertical arm of the boom body is placed between the limit column group for longitudinal limitation of the boom body, and the connecting rod is movably inserted into the port of the horizontal arm of the boom body for horizontal limitation of the boom body.

[0014] In a further solution, a reinforcing rod is connected between the bottom frame and the side frame, and an upper hook is installed on the top end of the side frame.

[0015] A second object of the present invention is to provide a forklift equipped with the forklift quick-change boom device.

[0016] A third object of the present invention is to provide a method for lifting a bag using the forklift mobile quick-change boom device, which comprises the following steps:

[0017] S1. Remove the forks from the side-shifting forklift, lower the forklift mast, and slowly move it to the front of the boom assembly.

[0018] S2. Using the side-shifting function of the side-shifting fork, move the bracket to the lower end of the upper hook assembly of the boom mechanism, hooking the upper hook assembly onto the welding plate on the bracket to limit the bracket's front-to-back position; then install a stop block to support the middle crossbeam on the bracket to limit the bracket's up-and-down position; finally, connect the boom mechanism to the bracket;

[0019] S3. Move the bracket sideways to the middle position of the forklift, and move the forklift backward, so that the bottom end of the vertical arm of the boom body moves out from between the limit column group, and the end of the horizontal arm of the boom body is separated from the connecting rod, thereby separating the boom mechanism from the quick-change mechanism and installing it on the forklift;

[0020] S4. The forklift moves to the front of the bag, and the side shifting fork drives the boom mechanism to move left and right; then drives the movable rod to move forward and backward; thereby adjusting the hook position on the movable rod and connecting it with the bag to be hung and taken;

[0021] S5. The gantry rises, driving the bag to rise; the forklift moves to transfer the bag.

[0022] Therefore, this application has the following advantages

[0023] 1) The movable rod of the present application realizes the movability of the hook, thereby eliminating the need for manual operation to hang and remove the bag, and enabling the bag to be quickly transported;

[0024] 2) The boom mechanism of the present application cooperates with the quick-change mechanism, thereby enabling the boom mechanism to be quickly replaced between the quick-change mechanism and the forklift;

[0025] 3) The quick-change mechanism in this application serves as a placement frame for the boom mechanism, allowing the boom mechanism with a special-shaped structure to stand upright and quickly dock with the side-shifting and adjustable-distance fork of a forklift; and the overall space occupied is small, and the placement is more beautiful and neat.

[0026] 4) The hook on the boom mechanism in this application is capable of forward and backward movement, while the side-shift fork on the forklift is capable of left and right movement. Once the boom mechanism is connected to the side-shift fork, the side-shift fork drives the boom mechanism to move left and right. When the forklift mast rises or falls, it drives the boom mechanism up and down, allowing the bag to be hoisted in various positions, and finally transported by the forklift.

[0027] 5) The shapes of the boom mechanism and the quick-change mechanism in the present application are adapted to each other and are connected together to form a frame structure; and there is a movably connected connection between the two, that is, the bottom end of the vertical arm of the boom body is placed between the limit column group for longitudinal limitation of the boom body, and the port of the horizontal arm of the boom body is movably plugged into the connecting rod for horizontal limitation of the boom body, thereby facilitating the connection or separation operation between the two. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings in the specification, which constitute a part of this application, are used to provide further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute improper limitations on this application.

[0029] Figure 1 The structure diagram of the boom mechanism in the present invention is shown in FIG. Figure 1 ;

[0030] Figure 2 The structure diagram of the boom mechanism in the present invention is shown in FIG. Figure 2 ;

[0031] Figure 3 This is a schematic structural diagram of the boom assembly of the present invention;

[0032] Figure 4 Schematic diagram of the structure of the movable tube in the present invention;

[0033] Figure 5 Schematic diagram of the structure of the U-shaped fixing frame in the present invention;

[0034] Figure 6 Schematic diagram of the structure of the upper hook assembly of the present invention;

[0035] Figure 7 Schematic diagram of the coordination between the boom mechanism, quick-change mechanism and side-shifting fork of the present invention Figure 1 ;

[0036] Figure 8 Schematic diagram of the coordination between the boom mechanism, quick-change mechanism and side-shifting fork of the present invention Figure 2 ;

[0037] Figure 9 Schematic diagram of the structure of the quick-change mechanism of the present invention;

[0038] Figure 10 It is a schematic diagram of the hoisting bag of the present invention.

[0039] Description of the marks in the figure:

[0040] 1-Boom mechanism, 11-Boom body, 111-Notch, 112-Connecting plate, 113-Reinforcement plate, 114-Stop block mounting hook, 12-Movable tube, 121-Steel tube, 122-Hook, 123-Cylinder base, 124-Roller shaft head, 125-Fixing hole; 13-Fixing tube, 14-Roller, 15-U-shaped fixing bracket, 151-U-shaped bracket, 152-Fixing block, 153-Connecting hole, 154-Rubber pad groove; 16-Cylinder, 17-Upper hook assembly, 171-Card plate, 172-Transition plate, 173-Hook limit plate, 18-Stop block;

[0041] 2-quick change mechanism, 21-bottom frame, 22-reinforcement rod, 23-side frame, 24-connecting rod, 25-upper hook, 26-limiting column assembly;

[0042] 3-side shifting fork;

[0043] 4-Hanging bag. DETAILED DESCRIPTION

[0044] The present application will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that, unless there is a conflict, the embodiments and features in the embodiments of the present application can be combined with each other.

[0045] Example 1:

[0046] See Figure 1-6 The present embodiment discloses a forklift mobile quick-change boom device, including a movably connected boom mechanism 1 and a quick-change mechanism 2, the boom mechanism 1 including two symmetrically arranged boom bodies 11, and a fixing tube 13 connected between the two boom bodies 11; the fixing tubes 13 are arranged at intervals between the boom bodies 11, wherein the fixing tube located at the lower part of the vertical arm is directly welded to the inner side wall of the boom body 11, because it will interfere with the bracket of the side shifting distance adjusting fork 3 after passing through the boom body 11; the fixing tube 13 of the other part (located on the upper part of the upper hook assembly 17) can pass through the boom body 11 for easy installation, and the end of the fixing tube 13 passing through the outer end of the boom body 11 is installed with a cover to prevent rainwater, dust, garbage, etc. from entering the interior of the boom body.

[0047] The two boom bodies 11 are tubular structures formed by integrating a vertical arm and a horizontal arm. In order to improve the overall strength, a reinforcing plate 113 is connected between the vertical arm and the horizontal arm to prevent them from bending and deforming due to stress. The end of the horizontal arm is slidably connected to a movable tube 12. The movable tube 12 is as shown in FIG. Figure 4 As shown, it includes a steel tube 121 with a hook 122 welded at the center of the steel tube 121 to ensure the stability of the device; the outer side of the vertical arm is fixed with an upper hook assembly 17 connected to the forklift. Both ends of the movable rod 12 are connected to roller shaft heads 124 for mounting the rollers 14.

[0048] The quick-change mechanism 2 is used to support the boom mechanism 1. It comprises a base frame 21 and side frames 23 connected together in an L-shaped structure. The vertical arm is mounted on the base frame 21, and the end of the horizontal arm is movably connected to the side frames 23. The quick-change mechanism serves as a support frame for the boom mechanism, allowing the special-shaped boom mechanism to stand upright and quickly connect to the side-shifting fork of a forklift. Furthermore, the quick-change mechanism facilitates the rapid replacement of the boom mechanism between the quick-change mechanism and the forklift.

[0049] In a further solution, a driving device is installed on the inner side of the boom body 11, and the movable end of the driving device is connected to the movable tube 12 to drive the movable tube 12 to move horizontally along the length direction of the horizontal arm.

[0050] In this embodiment, the driving device is preferably a cylinder 16. Cylinder bases 123 are mounted on each end of the movable tube 12. These bases are located inside the boom body 11. These bases have fixing holes 125 for receiving the movable ends of the cylinder 16, which are then locked in place with bolts. The cylinder 16 drives the movable tube 12 to move horizontally, thereby enabling the hanging bag 4 to be hung and removed.

[0051] In order to fix the oil cylinder 16, a connecting plate 112 is fixed on the inner side of the boom body 11, and a U-shaped fixing frame 15 is provided on the driving device. Figure 5 As shown, the U-shaped fixing bracket 15 comprises a U-shaped bracket 151. Fixing blocks 152 are fixed to each end of the open end of the U-shaped bracket 151. These fixing blocks 152 are provided with connection holes 153. The open end of the U-shaped fixing bracket 155 extends from the bottom end of the oil cylinder 16 and is then connected to the connecting plate 112. Bolts are passed through the connecting plate 112 and the connection holes 153 in the fixing blocks 152 to secure the cylinder. Specifically, the cylinder base of the oil cylinder 16 is fixedly supported by the U-shaped fixing bracket 155 and connected to the connecting plate 112 on the boom body 11. The movable end of the oil cylinder 16 is connected to the cylinder base 123. The end other than the movable end can be fixed to the fixed pipe 3. A mounting block is also fixed to the fixed pipe 3 to secure the cylinder base.

[0052] The inner ring of the U-shaped frame 151 is provided with a rubber pad groove 154 for retaining the rubber pad. The rubber pad groove 154 is to prevent the rubber pad from detaching while ensuring an aesthetically pleasing installation. The rubber pad primarily serves as a buffer and protector, as the oil cylinder 16 and the U-shaped fixing frame 15 are in rigid contact, which would damage the paint on the oil cylinder 16.

[0053] In a further embodiment, the ends of the opposite sides of the horizontal arm are each provided with a slot 111; rollers 14 are respectively installed at both ends of the movable tube 12, and the rollers 14 are built into the inner cavity of the horizontal arm and move horizontally along the slot 111. The rollers 14 are bolted to the roller shaft heads 124 of the movable rod 12.

[0054] In a further solution, the upper hook assembly 17 includes a clamping plate 171 fixed on the vertical arm, and the bottom end of the clamping plate 171 is connected to a hook limiting plate 173 through a transition plate 172, and the hook limiting plate 173 is used to mount the side shifting and adjusting fork 3 of the forklift to achieve connection; the bottom end of the vertical arm is equipped with a stop block mounting hook 114, and the stop block mounting hook 114 is equipped with a stop block 18 for limiting the side shifting and adjusting fork 3, thereby achieving the upper and lower direction limitation of the boom mechanism 1.

[0055] The upper hook assembly 17 is used to hang the boom mechanism 1 on the bracket of the side shift adjustment fork 3, wherein the upper hook assembly 17 is clamped on the boom body 11 through the clamping plate 171 and welded, and is also reinforced with reinforcing ribs to ensure the welding strength of the upper hook assembly 17 and prevent the weld from cracking.

[0056] like Figure 9 As shown, the quick-change mechanism 2 includes a base frame 21 and a side frame 23 connected in an L-shaped structure, a limit column group 26 is vertically fixed to the end of the base frame 21, and a connecting rod 24 is horizontally fixed to the top of the side frame 23; the bottom end of the vertical arm of the boom body 11 is placed between the limit column group 26 for longitudinally limiting the boom body 11, and the connecting rod 24 is movably inserted into the port of the horizontal arm of the boom body 11 for horizontally limiting the boom body 11.

[0057] Furthermore, reinforcing rods 22 are connected between the base frame 21 and the side frames 23. Both the base frame 21 and the side frames 23 are constructed from welded longitudinal and transverse rectangular steel tubes. The reinforcing rods 22 further ensure the stability of the entire structure. Covers are installed at the exposed ends of the longitudinal and transverse rectangular steel tubes to prevent rainwater from entering and causing internal rust. An upper hook 25 is mounted at the top of the side frames 23. Because the quick-change mechanism 2 is relatively heavy, the upper hook 25 is used to lift the quick-change mechanism 2 during welding and transport, eliminating manual operation.

[0058] See Figure 7 、 8 10. The boom mechanism 1 is used to carry the bag 4. The quick-change mechanism 2 supports the boom mechanism 1 and assists in its rapid replacement and installation on the forklift's side-shifting fork 3. The hook 122 on the boom mechanism 1 is capable of forward and backward movement. The side-shifting fork 3 can move left and right, thereby driving the boom mechanism 1 to move left and right. When the forklift mast rises or falls, it drives the boom mechanism 1 up and down, thereby enabling the bag 4 to be lifted or carried in various positions.

[0059] Example 2:

[0060] A forklift is provided with a forklift mobile quick-change boom device as described in Example 1, wherein the boom mechanism 1 serves as an attachment of the forklift, and the quick-change mechanism 2 serves as a placement frame for the boom mechanism 1, so that the boom mechanism with a special-shaped structure can be erected to achieve rapid docking and installation with the side-shifting and adjustable distance fork of the forklift.

[0061] Example 3:

[0062] A method for lifting a bag by moving a quick-change boom device using a forklift, comprising the following steps:

[0063] S1. Remove the cargo fork from the side shifting fork 3 of the forklift, lower the forklift mast, and slowly move it to the front of the boom assembly 1;

[0064] S2. Use the lateral shifting function of the side-shifting fork 3 to move the bracket to the lower end of the upper hook assembly 17 of the boom mechanism 1, so that the upper hook assembly 17 is hooked on the welding plate on the bracket to limit the bracket in the front and rear directions; then install the stop block 18 to support the middle crossbeam on the bracket to limit the bracket in the up and down directions; finally, connect the boom mechanism 1 to the bracket;

[0065] S3. The bracket is moved to the middle position of the forklift, and the forklift moves backward, so that the bottom end of the vertical arm of the boom body 11 moves out from between the limit column group 26, and the end of the horizontal arm of the boom body 11 is separated from the connecting rod 24, thereby separating the boom mechanism 1 from the quick-change mechanism 2 and installing it on the forklift;

[0066] S4, the forklift moves to the front of the bag 4, and the side shifting fork 3 drives the boom mechanism 1 to move left and right; then drives the movable rod 12 to move forward and backward; thereby adjusting the position of the hook 122 on the movable rod 12 and connecting it with the bag 4 to hang it;

[0067] S5. The gantry is lifted, driving the bag 4 to be lifted; the forklift then moves to transfer the bag 4.

[0068] Specific examples Figure 7 、 8 This is a schematic diagram of the quick-change process of the boom mechanism 1. The forklift mast and forklift body are omitted in the figure. A side-shifting distance-adjusting fork 3 is provided on the forklift mast (the side-shifting distance-adjusting fork 3 is an existing component on the forklift, and this application does not involve improvements to its structure). The side-shifting distance-adjusting fork 3 is provided with a bracket for connecting the fork and the fork frame, which is responsible for the side-shifting distance-adjusting function of the fork.

[0069] When the forklift needs to install the boom mechanism 1, the fork equipped on the side shifting and adjusting fork 3 needs to be removed and the forklift mast lowered; the forklift is slowly driven to the front of the boom assembly 1, and the side shifting and adjusting fork 3 on the forklift is used to move the bracket to the lower end of the upper hook assembly 17 of the boom mechanism 1. The hook limit plate 173 on the upper hook assembly 17 is hooked onto the welding plate on the bracket to limit the bracket in the front and rear directions; the mast is raised to ensure that the boom mechanism 1 is hung on the bracket of the side shifting and adjusting fork 3. The upper stop block 18 is then fixed to the stop block mounting hook 114 with bolts. The stop block 18 supports the middle crossbeam on the bracket to limit the bracket in the up and down directions; finally, the boom mechanism 1 is connected to the bracket. Finally, the bracket is moved sideways to the middle position of the forklift, that is, the center of the boom mechanism 1 coincides with the center of the side shifting fork 3, and the forklift is then moved backward to separate the boom mechanism 1 from the quick-change mechanism 2. That is, the bottom end of the vertical arm of the boom body 11 is moved out from between the limit column group 26, and the end of the horizontal arm of the boom body 11 is separated from the connecting rod 24. This completes the installation of the boom mechanism 1 and the forklift.

[0070] like Figure 10 The figure shows the operation diagram of the movable hook-type boom mechanism, in which the oil cylinders 16 on both sides of the boom mechanism 1 are controlled by a valve to ensure the synchronization of the oil cylinders, thereby driving the movable rod 12 to move smoothly and linearly. When the forklift travels in front of the bag 4, the left and right directions of the boom mechanism 1 are moved by moving the bracket to the left and right; then the extension and contraction of the oil cylinder 16 are controlled to realize the front and back movement of the movable rod 12; through the above two actions, the hook 122 on the movable rod 12 is hooked with the bag 4; then the bag 4 is lifted by lifting the gantry. Finally, the bag 4 is transported by the travel of the forklift. The boom mechanism 1 of the present application is a "7"-shaped structure, and the hook 122 is located at the front end, thereby forming a space for accommodating the bag 4, which is convenient for rotating the bag 4.

[0071] When the boom mechanism 1 is no longer required to be mounted on a forklift for lifting operations, it is separated from the forklift's side shifting fork 3. Specifically, the forklift is slowly driven in front of the quick-change mechanism 2, the forklift mast is lowered, and the side shifting fork 3 on the forklift is used to move the boom mechanism 1 connected to the bracket to the side, so that the bottom end of the vertical arm of the boom body 11 of the boom mechanism 1 is placed between the limit column group 26 on the quick-change mechanism 2. The forklift is then slightly moved forward, pushing the boom mechanism 1 forward. Due to the two sets of limit column groups 26 limiting and guiding the two boom bodies 11, during the forward movement, the end of the horizontal arm of the boom body 11 is connected to the connecting rod 24 on the quick-change mechanism 2, and the bottom end of the vertical arm of the boom body 11 is exactly located between the limit column group 26, thereby placing the boom mechanism 1 on the quick-change mechanism 2. The lower stop block 18 is then removed, and after the mast is further lowered, the bracket is separated from the upper hook assembly 17. The forklift moves backward, and the boom mechanism 1 is supported on the quick-change mechanism 2 and separated from the forklift.

[0072] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application are within the scope of protection of the pending claims of the present application.

Claims

1. A forklift quick-change boom device, characterized in that: The invention comprises a movably connected boom mechanism (1) and a quick-change mechanism (2), wherein the boom mechanism (1) comprises two symmetrically arranged boom bodies (11) and a fixed tube (13) connected between the two boom bodies (11); the boom body (11) is a tubular structure formed by a vertical arm and a horizontal arm, wherein the end of the horizontal arm is slidably connected to a movable tube (12), and a hook (122) is fixed at the center of the movable tube (12); an upper hook assembly (17) connected to a forklift is fixed on the outer side of the vertical arm; the quick-change mechanism (2) is used to support the boom mechanism (1), and the quick-change mechanism (2) comprises a bottom frame (21) and a side frame (23) connected together in an L-shaped structure, wherein the vertical arm is mounted on the bottom frame (21), and the end of the horizontal arm is movably connected to the side frame (23).

2. A forklift quick-change boom device according to claim 1, characterized in that: A driving device is installed on the inner side of the boom body (11), and a movable end of the driving device is connected to the movable tube (12) to drive the movable tube (12) to move horizontally along the length direction of the horizontal arm.

3. A forklift quick-change boom device according to claim 2, characterized in that: The driving device is an oil cylinder (16), and oil cylinder bases (123) are respectively installed at both ends of the movable tube (12), and the oil cylinder bases (123) are provided with fixing holes (125) for plugging the movable ends of the oil cylinder (16); A connecting plate (112) is fixedly provided on the inner side of the boom body (11), a U-shaped fixing frame (15) is sleeved on the driving device, and an open end of the U-shaped fixing frame (15) is fixedly connected to the connecting plate (112).

4. A forklift quick-change boom device according to claim 3, characterized in that: The U-shaped fixing frame (15) comprises a U-shaped frame (151), both ends of the open end of the U-shaped frame (151) are fixed with fixing blocks (152), and the fixing blocks (152) are provided with connecting holes (153); the inner ring of the U-shaped frame (151) is provided with a rubber pad groove (154) for clamping a rubber pad.

5. A forklift quick-change boom device according to claim 1, characterized in that: The ends of the opposite sides of the horizontal arm are both provided with slots (111); rollers (14) are respectively installed at both ends of the movable tube (12); the rollers (14) are built into the inner cavity of the horizontal arm and move horizontally along the slots (111).

6. A forklift quick-change boom device according to claim 1, characterized in that: The upper hook assembly (17) comprises a clamping plate (171) fixed on the vertical arm, the bottom end of the clamping plate (171) is connected to a hook limiting plate (173) through a transition plate (172), and the hook limiting plate (173) is used to hang the side shifting distance adjusting fork (3) of the forklift to achieve connection; the bottom end of the vertical arm is equipped with a stop block mounting hook (114), and the stop block mounting hook (114) is equipped with a stop block (18) for limiting the side shifting distance adjusting fork (3).

7. A forklift quick-change boom device according to claim 1, characterized in that: A limiting column group (26) is vertically fixed to the end of the bottom frame (21), and a connecting rod (24) is horizontally fixed to the top of the side frame (23); the bottom end of the vertical arm of the boom body (11) is placed between the limiting column group (26) for longitudinally limiting the boom body (11), and the connecting rod (24) is movably inserted into the port of the horizontal arm of the boom body (11) for horizontally limiting the boom body (11).

8. A forklift quick-change boom device according to claim 7, characterized in that: A reinforcing rod (22) is connected between the bottom frame (21) and the side frame (23), and an upper hook (25) is installed at the top end of the side frame (23).

9. A forklift, characterized in that: A forklift quick-change boom device is provided as claimed in any one of claims 1 to 8.

10. A method for lifting a bag using a forklift mobile quick-change boom device according to any one of claims 1 to 8, characterized in that: The steps include: S1. Remove the cargo fork from the side shifting fork (3) of the forklift, lower the mast of the forklift, and slowly move it to the front of the boom assembly (1); S2, by using the side shifting function of the side shifting distance adjusting fork (3), the bracket is moved to the lower end of the upper hook assembly (17) of the boom mechanism (1), so that the upper hook assembly (17) is hooked on the welding plate on the bracket, thereby limiting the front and rear directions of the bracket; then, a stop block (18) is installed to support the middle crossbeam on the bracket, thereby limiting the vertical directions of the bracket; finally, the boom mechanism (1) is connected to the bracket; S3, the bracket is moved to the middle position of the forklift, and the forklift moves backward, so that the bottom end of the vertical arm of the boom body (11) moves out from between the limit column group (26), and the end of the horizontal arm of the boom body (11) is separated from the connecting rod (24), thereby separating the boom mechanism (1) from the quick-change mechanism (2) and installing it on the forklift; S4, the forklift moves in front of the bag (4), and the side shifting distance adjustment fork (3) drives the boom mechanism (1) to move in the left and right directions; then drives the movable rod (12) to move in the front and back directions; thereby adjusting the position of the hook (122) on the movable rod (12) and connecting it with the bag (4) for hanging and taking; S5, the gantry is lifted, driving the bag (4) to be lifted; the forklift is driven to transfer the bag (4).

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