An off-road telescopic forklift with a quick-change fork frame

Abstract

The present invention relates to the technical field related to telescopic arm forklifts, and discloses an off-road telescopic arm forklift with a quick-change fork frame, including a fork shovel rack including two parts: a mounting assembly and a connecting assembly. Parts of the connecting assembly and parts of the mounting assembly are connected by plugging, which facilitates the replacement of the fork shovel joint part; parts of the mounting assembly and parts of the arm assembly are connected by bolt insertion, which facilitates the replacement of joints in actual operation; the present invention can be used to connect the mounting assembly and the forearm mounting frame with a pin bolt, and design a plug-in embedding structure of the first buckle and the primary positioning plate, and the second buckle and the secondary positioning plate, so as to realize the rapid disassembly and installation of the fork frame. In traditional forklift operations, replacing the fork frame often requires professional tools and a long time. Each replacement takes an average of about 30 minutes, and the process is cumbersome and easily affected by environmental factors.

Description

Technical Field

[0001] The present invention belongs to the technical field related to telescopic arm forklifts, and more specifically, relates to an off-road telescopic arm forklift with a quick-change fork frame. Background Art

[0002] With the rapid development of modern industry, the demand for material handling equipment in industries such as logistics, construction, and warehousing is becoming increasingly diverse and complex. Telescopic forklifts, as highly efficient material handling equipment that combines the functions of a forklift and a crane, are gradually emerging in various work environments. With their retractable booms, they enable long-distance and high-altitude material handling and loading and unloading operations. However, existing telescopic forklifts have the following drawbacks:

[0003] In the existing technology, telescopic forklifts and traditional forklifts generally have the problem of low efficiency in replacing the fork frame. When replacing the fork frame of a traditional forklift, it is necessary to use a variety of tools such as wrenches and screwdrivers to first remove the fixing bolts, then remove the old fork frame, and then re-align and tighten the bolts when installing the new fork frame. The entire process is cumbersome, and a single replacement often takes more than 30 minutes, seriously affecting the progress of the operation. Moreover, in complex working scenarios such as narrow spaces and muddy ground, the operation difficulty is further increased. Not only is the technical requirements of the operator high, but it is also prone to installation deviations. Although ordinary telescopic forklifts have a wider operating range, the replacement structure of the fork frame is not reasonably designed, and there are also problems with long replacement time and poor adaptability.

[0004] Therefore, in view of this, the existing structure and defects are studied and improved, and an off-road telescopic arm forklift with a quick-change fork frame is provided, in order to achieve a more practical and valuable purpose. Summary of the Invention

[0005] The present invention provides an off-road telescopic forklift with a quick-change fork frame, which is used to overcome the above-mentioned defects in the prior art.

[0006] The purpose and effect of the off-road telescopic forklift with a quick-change fork frame of the present invention are achieved by the following specific technical means:

[0007] An off-road telescopic forklift with a quick-change fork frame, wherein the output end of the off-road forklift is connected to a boom assembly, and the end of the boom assembly is fixedly connected to a fork shovel rack;

[0008] The fork-shovel rack comprises two parts, a mounting assembly and a connecting assembly. The connecting assembly is connected to the mounting assembly by plugging, which facilitates the replacement of the fork-shovel joint. The mounting assembly is connected to the arm assembly by bolt insertion, which facilitates the replacement of the joint in actual operation.

[0009] A locking assembly is provided inside the mounting assembly, and the locking assembly can accurately adjust the locking strength of the connecting assembly according to the adjustment distance of the fork, thereby ensuring that the entire mechanical structure can operate stably and efficiently under different working conditions.

[0010] A further technical solution is that the mounting assembly includes an arm protection plate, the arm protection plate is provided with a middle frame, the middle frame vertical array is provided with a first-level positioning assembly and a second-level positioning assembly, the first-level positioning assembly is arranged above the second-level positioning assembly, two first-level positioning plates are fixedly provided on the outer surface of the first-level positioning assembly, the surface of the first-level positioning plate is provided with a first-level circular positioning hole, the outer array of the second-level positioning assembly is provided with two second-level positioning plates, the surface of the second-level positioning plate is provided with a second-level circular positioning hole.

[0011] A further technical solution is that two groups of oblique fixing plates are fixedly installed on the back of the first-level positioning component and the second-level positioning component, a first-level cross column is connected between the two groups of oblique fixing plates, and a second-level cross column is also fixedly connected between the two groups of the first-level cross columns, and a swing piece is fixedly linked to the outer side of the second-level cross column, and a through hole is provided at the outer end of the swing piece, and a first locking buckle is inserted into the through hole.

[0012] A further technical solution is that the connecting assembly includes two groups of horizontal plates arranged vertically, and both ends of the two groups of horizontal plates are connected to a mounting back plate. A first buckle and a second buckle are fixed to the outer side of the two groups of mounting back plates, and the second buckle is arranged below the first buckle. An embedding groove is provided at the connection between the first buckle and the mounting back plate, and a barb is provided at the connection between the second buckle and the mounting back plate. The first buckle realizes a socket connection with the primary positioning plate, and the second buckle realizes an embedded limit with the secondary positioning plate.

[0013] A further technical solution is that the locking assembly includes the first-level horizontal column, an inner cavity is provided inside the first-level horizontal column, a bidirectional motor is fixedly installed in the middle of the inner cavity, the two output ends of the bidirectional motor are fixedly connected with output shafts, the ends of the two groups of output shafts are fixedly connected with locking blocks, the outer side of the locking block is fixedly connected with a side airbag, and the other end of the side airbag is fixedly connected to the side wall of the inner cavity.

[0014] A further technical solution is that a friction airbag is provided above the locking block, and the friction airbag is connected to the inside of the side airbag. A threaded through hole is provided on the locking block, and a fork shovel is threadedly installed in the threaded through hole. An air pipe is connected between the secondary cross column and the primary cross column, and a pressure stabilizing chamber is provided inside the air pipe.

[0015] A further technical solution is that the first-level positioning plate includes a shell, a cavity is provided inside the shell, a second locking buckle is installed in the cavity, the second locking buckle moves inside the first-level circular positioning hole, a piston plate is provided on the outside of the second locking buckle, a high-pressure chamber is provided between the piston plate and the second locking buckle, a return spring is connected between the piston plate and the inner wall of the shell, a connecting pipe is connected to the outside of the shell, and the connecting pipe is connected to the inside of the pressure stabilizing chamber.

[0016] A further technical solution is that the outer movable connection of the secondary cross column is provided with an outer air tube, the interior of the fork shovel is provided with a protruding air bag hole, the fork shovel is provided with a cavity, the cavity is connected with the outer air tube through a socket, and the cavity is inflated to make the protruding air bag hole protrude to increase friction.

[0017] A further technical solution is that the arm assembly includes an arm bracket, the arm bracket is fixedly connected to the off-road forklift, a boom is hingedly provided on the arm bracket, a hydraulic support rod is fixedly connected between the boom and the arm bracket, the output end of the boom is fixedly connected with a forearm mounting frame assembly, and the end of the forearm mounting frame assembly is connected to the arm assembly via the first locking buckle.

[0018] A further technical solution is that the secondary positioning plate structure is aligned with the primary positioning plate, the interior of the secondary positioning plate is connected to the interior of the pressure stabilizing chamber, and the hydraulic pressure inside the pressure stabilizing chamber pushes the secondary positioning plate and the second locking buckle provided on the primary positioning plate to achieve a locking connection with the connecting assembly.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention provides an off-road telescopic arm forklift with a quick-change fork frame, which uses a latch bolt to connect the mounting assembly and the forearm mounting frame, and designs a plug-in embedding structure between the first buckle and the first-level positioning plate, and the second buckle and the second-level positioning plate, to achieve rapid disassembly and installation of the fork frame. In traditional forklift operations, replacing the fork frame often requires professional tools and a long time. Each replacement takes an average of about 30 minutes, and the process is cumbersome and easily affected by environmental factors. The quick-change structure of the present invention, with the help of the convenient plugging and unplugging of the latch bolts and the precise positioning of the plug-in embedding structure, allows the operator to complete the replacement of the fork frame within 5 minutes with simple operations without the need for complex tools. This rapid replacement capability greatly reduces the idle time of the equipment, improves the utilization rate of the equipment, and significantly improves the versatility and operating efficiency of the forklift. Compared with traditional forklifts, the overall work efficiency can be improved by more than 60%.

[0021] The present invention provides an off-road telescopic arm forklift with a quick-change fork frame. It uses a bidirectional motor to drive the locking block, and cooperates with the side airbags, friction airbags and pressure-stabilizing chamber to automatically adjust the distance between the forks and the locking force according to the size of the cargo. When the distance between the forks and the shovel changes, the side airbags are compressed to change the pressure in the pressure-stabilizing chamber, and at the same time, the friction airbags are expanded to enhance the tightness of the connection, which not only ensures the stable locking of the connector under different working conditions, but also prevents failure caused by hydraulic leakage. In actual operation, when transporting small precision instruments, the distance between the forks and the shovel is small, and the system automatically provides a small but stable locking force to avoid damage to the cargo due to excessive squeezing; when transporting large and heavy equipment, the distance between the forks and the shovel is increased, and the system senses it in real time and automatically increases the locking force to ensure that the cargo is stable and does not slip. In the past, when traditional forklifts transported cargo of different weights, they needed to manually adjust the locking device. Not only was the adjustment accuracy low, but there was also the risk of insufficient or excessive locking due to human error.

[0022] The present invention relates to an off-road telescopic arm forklift with a quick-change fork frame, which fixes the fork shovel with bolts and uses an outer air pipe to fill the protruding airbag hole of the fork shovel with liquid. The supporting force generated by the expansion of the airbag is used to enhance the structural strength of the fork shovel, disperse the stress during cargo transportation, reduce the risk of deformation of the fork shovel, and extend the service life of the fork shovel. In traditional fork shovel operations, the fork shovel is prone to bending and deformation when carrying heavy objects, especially under frequent operations, and the deformed fork shovel may also affect the stability and safety of cargo transportation. The fork shovel of the present invention has a reinforced support design. When carrying heavy objects, the protruding airbag hole is filled with liquid, and the airbag expands to form a uniform supporting force, which evenly disperses the stress generated by the weight of the cargo to various parts of the fork shovel. The enhanced structural strength ensures the safety and reliability of the forklift in equipment operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] The present invention will be further described below with reference to the accompanying drawings and examples.

[0025] Figure 1 This is a schematic diagram of the overall appearance structure of the present invention;

[0026] Figure 2 It is a schematic diagram of the overall top view of the structure of the present invention;

[0027] Figure 3 This is a schematic diagram of the overall appearance of the arm assembly and the fork-shovel rack in the present invention;

[0028] Figure 4This is a schematic diagram of the overall structure of the boom assembly and the fork-shovel rack in the present invention from a bottom view;

[0029] Figure 5 It is a schematic side view of the overall structure of the arm assembly and the fork-shovel rack in the present invention;

[0030] Figure 6 This is a schematic diagram of the overall front view structure of the installation assembly in the present invention;

[0031] Figure 7 This is a schematic diagram of the overall back outer structure of the installation component of the present invention;

[0032] Figure 8 The present invention is a schematic diagram of the overall front structure of the connecting assembly;

[0033] Figure 9 A schematic diagram of the overall appearance of the fork shovel shelf of the present invention;

[0034] Figure 10 This is a schematic diagram of the overall side cross-section structure of the center fork shovel rack of the present invention;

[0035] Figure 11 It is a schematic diagram of the overall top-sectional structure of the installation component in the present invention.

[0036] Description of reference numerals:

[0037] Off-road forklift 11, arm assembly 12, fork shovel rack 13, boom 14, hydraulic support rod 15, arm bracket 16, forearm mounting frame assembly 17, mounting assembly 18, connecting assembly 19, arm guard plate 24, first-level positioning assembly 25, second-level positioning assembly 26, first-level positioning plate 28, first-level circular positioning hole 29, second-level positioning plate 30, second-level circular positioning hole 31, first-level cross column 33, swing piece 34, second-level cross column 35, first locking buckle 36, mounting back plate 37, first buckle 38, second buckle 39, cross plate 41, piston plate 42, second locking buckle 43, return spring 44, connecting pipe 45, bidirectional motor 46, friction airbag 47, air supply pipe 48, outer air pipe 49, protruding airbag hole 50, inner cavity 51, output shaft 52, locking block 53, side airbag 54, pressure stabilizing chamber 55. DETAILED DESCRIPTION

[0038] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0039] In the description of the present invention, unless otherwise specified, "plurality" means two or more; terms such as "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," and "tail" indicate positions or relationships based on those shown in the accompanying drawings. These terms are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, terms such as "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0041] As attached Figure 1 To the attached Figure 11 As shown:

[0042] The present invention provides an off-road telescopic forklift with a quick-change fork frame, wherein an output end of the off-road forklift 11 is connected to a boom assembly 12, and an end of the boom assembly 12 is fixedly connected to a fork shovel rack 13;

[0043] The fork-shovel rack 13 includes two parts: a mounting assembly 18 and a connecting assembly 19. The connecting assembly 19 is connected to the mounting assembly 18 by plugging, which facilitates the replacement of the fork-shovel joint. The mounting assembly 18 is connected to the arm assembly 12 by bolt insertion, which facilitates the replacement of the joint in actual operation.

[0044] A locking assembly is provided inside the mounting assembly 18, and the locking assembly can accurately adjust the locking strength of the connecting assembly 19 according to the adjustment distance of the fork, thereby ensuring that the entire mechanical structure can operate stably and efficiently under different working conditions.

[0045] Preferably, refer to the attached Figure 6The mounting assembly 18 includes an arm protection plate 24, the arm protection plate 24 is provided with a middle frame, the middle frame vertical array is provided with a first-level positioning assembly 25 and a second-level positioning assembly 26, the first-level positioning assembly 25 is arranged above the second-level positioning assembly 26, and two first-level positioning plates 28 are fixedly provided on the outer surface of the first-level positioning assembly 25, and a first-level circular positioning hole 29 is provided on the surface of the first-level positioning plate 28. The outer array of the second-level positioning assembly 26 is provided with two second-level positioning plates 30, and the surface of the second-level positioning plate 30 is provided with a second-level circular positioning hole 31.

[0046] Preferably, refer to the attached Figure 7 Two groups of oblique fixing plates are fixedly installed on the back of the first-level positioning component 25 and the second-level positioning component 26. A first-level horizontal column 33 is connected between the two groups of oblique fixing plates. A second-level horizontal column 35 is also fixedly connected between the two groups of the first-level horizontal columns 33. A swing piece 34 is fixedly connected to the outside of the second-level horizontal column 35. The outer end of the swing piece 34 is provided with a through hole, and a first locking buckle 36 is inserted into the through hole.

[0047] Preferably, refer to the attached Figure 8 The connecting assembly 19 includes two groups of horizontal plates 41 arranged vertically, and both ends of the two groups of horizontal plates 41 are connected to a mounting back plate 37. A first buckle 38 and a second buckle 39 are fixed to the outside of the two groups of mounting back plates 37. The second buckle 39 is arranged below the first buckle 38. An embedding groove is provided at the connection between the first buckle 38 and the mounting back plate 37, and a barb is provided at the connection between the second buckle 39 and the mounting back plate 37. The first buckle 38 realizes a socket connection with the primary positioning plate 28, and the second buckle 39 realizes an embedded limit with the secondary positioning plate 30.

[0048] Preferably, refer to the attached Figure 10 and attached Figure 11 The locking assembly includes the first-level horizontal column 33, an inner cavity 51 is provided inside the first-level horizontal column 33, a bidirectional motor 46 is fixedly installed in the middle of the inner cavity 51, and the two output ends of the bidirectional motor 46 are fixedly connected with an output shaft 52, and the ends of the two groups of the output shafts 52 are fixedly connected with locking blocks 53, and the outer side of the locking block 53 is fixedly connected with a side airbag 54, and the other end of the side airbag 54 is fixedly connected to the side wall of the inner cavity 51.

[0049] Preferably, refer to the attached Figure 10 and attached Figure 11A friction airbag 47 is also provided above the locking block 53, and the friction airbag 47 is communicated with the inside of the side airbag 54. A threaded through hole is provided on the locking block 53, and a fork shovel is installed in the threaded through hole. An air pipe 48 is connected between the secondary cross column 35 and the primary cross column 33, and a pressure stabilizing chamber 55 is provided inside the air pipe 48.

[0050] Preferably, refer to the attached Figure 10 and attached Figure 11 The first-level positioning plate 28 includes a shell, a cavity is provided inside the shell, a second locking buckle 43 is installed in the cavity, the second locking buckle 43 is movable inside the first-level circular positioning hole 29, a piston plate 42 is provided on the outside of the second locking buckle 43, a high-pressure chamber is provided between the piston plate 42 and the second locking buckle 43, a return spring 44 is connected between the piston plate 42 and the inner wall of the shell, a connecting pipe 45 is connected to the outside of the shell, and the connecting pipe 45 is communicated with the inside of the pressure-stabilizing chamber 55.

[0051] Preferably, refer to the attached Figure 10 and attached Figure 11 The outer side of the secondary cross column 35 is movably connected with an outer air tube 49, and the interior of the fork shovel is provided with a protruding air bag hole 50. The fork shovel is provided with a cavity, which is connected to the outer air tube 49 through a socket. When the cavity is inflated, the protruding air bag hole 50 will protrude to increase friction.

[0052] Preferably, refer to the attached Figure 3 The arm assembly 12 includes an arm bracket 16, which is fixedly connected to the off-road forklift 11. A boom 14 is hingedly provided on the arm bracket 16. A hydraulic support rod 15 is fixedly connected between the boom 14 and the arm bracket 16. The output end of the boom 14 is fixedly connected to a forearm mounting frame assembly 17, and the end of the forearm mounting frame assembly 17 is connected to the arm assembly 12 via the first locking buckle 36.

[0053] Preferably, refer to the attached Figure 6 and attached Figure 10 The structure of the secondary positioning plate 30 is consistent with that of the primary positioning plate 28. The interior of the secondary positioning plate 30 is connected to the interior of the pressure stabilizing chamber 55. The hydraulic pressure inside the pressure stabilizing chamber 55 pushes the secondary positioning plate 30 and the second locking buckle 43 provided on the primary positioning plate 28 to achieve a locking connection with the connecting assembly 19.

[0054] Specific use of the present invention:

[0055] Before using this device, first install the mounting assembly 18 onto the forearm mounting bracket assembly 17 of the forklift. Install the quick-change head using the latch bolts. Then, install the connecting assembly 19 for different scenarios. To install the connecting assembly 19, place it horizontally with the mounting assembly 18. Align the first and second latches 38 and 39 of the connecting assembly 19 horizontally with the primary and secondary locating plates 28 and 30 of the mounting assembly 18. Once aligned, push the connecting assembly 19 laterally to secure it to the mounting assembly 18. The latch bolt connection facilitates quick removal and replacement, meeting the needs of various operating scenarios. The first latch 38 and the primary locating plate 28, and the second latch 39 and the secondary locating plate 30, utilize the principles of socket and insert retention to create a secure mechanical connection, ensuring that the connecting assembly 19 is not easily loosened on the mounting assembly 18. This allows for quick replacement of the fork carriage, adapting to different usage scenarios, and solving the problem of cumbersome fork carriage replacement on traditional forklifts, thereby improving work efficiency.

[0056] After the vehicle is started, the internal hydraulic oil circuit of the vehicle is connected to the mounting assembly 18, and the pressure-stabilizing chamber 55 is hydraulically pushed horizontally, so that the mounting assembly 18 and the connecting assembly 19 maintain a constant pressure locking state. After the hydraulic oil circuit is connected, the pressure-stabilizing chamber 55 is hydraulically pushed horizontally, utilizing the pressure characteristics of the hydraulic pressure to provide a constant locking force for the mounting assembly 18 and the connecting assembly 19, ensuring the stable connection between the various components of the equipment during operation, avoiding loose connections due to factors such as vibration, ensuring the stable connection between the mounting assembly and the connecting assembly during equipment operation, reducing the possibility of failures caused by loose connections, and improving the reliability of equipment operation.

[0057] The operator adjusts the distance between the two forks according to the size of the cargo. To adjust the distance, the bidirectional motor 46 inside the primary crossbar 33 rotates the output shaft 52, which in turn drives the locking block 53 to move laterally. This movement compresses the side airbag 54. The fluid inside the airbag 54 flows through a pipe into the pressure-stabilizing chamber 55, pressurizing it and preventing hydraulic leakage from causing the connector to fail. Furthermore, the larger the cargo and the greater the distance between the forks, the greater the locking force required. When the side airbag 54 is squeezed, some of the fluid enters the friction airbag 47, causing it to expand, filling and locking the fork-shovel connection. The bidirectional motor 46 drives the output shaft 52 to rotate, enabling precise control of the position of the locking block 53. The pressurized side airbag 54 delivers fluid to the pressure-stabilizing chamber 55, compensating for the pressure and maintaining a stable locking pressure. Liquid flows into friction airbag 47, causing it to expand. The deformation of the airbag generates friction, strengthening the tightness of the fork-shovel connection and automatically adjusting the locking force according to the weight of the cargo. The ability to automatically adjust the fork-shovel spacing and locking force according to the size of the cargo ensures stable operation when handling cargo of different sizes, improving the applicability and safety of the equipment.

[0058] Liquid squeezed and pushed by the side airbag 54 enters the primary positioning plate 28 through the connecting tube 45, pushing the piston plate 42, squeezing the locking buckle 43 and extending it, locking the secondary buckle 39. Liquid entering the pressure-stabilizing chamber 55 then flows through the pipe to the secondary positioning plate 30, locking it with the secondary circular positioning hole 31, further ensuring the stability of the connecting assembly 19. The pressure transfer from the liquid pushes the piston plate 42, converting hydraulic energy into mechanical energy, causing the locking buckle 43 to extend and engage with the secondary buckle 39. The liquid entering the pressure-stabilizing chamber 55 then acts on the secondary positioning plate 30, engaging the secondary circular positioning hole 31 to form a double-locking mechanism, restricting the displacement of the connecting assembly 19 in multiple directions and improving overall connection stability. This double-locking mechanism further enhances the stability of the connecting assembly, reduces the risk of loosening or displacement during operation, and ensures the normal operation of the equipment.

[0059] When installing the fork shovel, bolt it to the locking block 53 and connect it to the outer air pipe 49 via a socket connection. Liquid in the side airbag 54 enters the pressure-stabilizing chamber 55 and then flows through the outer air pipe 49 into the fork shovel, filling the protruding airbag hole 50, providing rigid support for the fork shovel and improving safety. Bolting ensures a rigid connection between the fork shovel and the locking block 53. Liquid filling the protruding airbag hole 50 utilizes the supporting force of the expanded airbag to enhance the fork shovel's structural strength, dissipate stress during cargo handling, and reduce the risk of fork shovel deformation, thereby improving the safety of the equipment during operation. This enhanced structural strength of the fork shovel reduces the possibility of fork shovel deformation during cargo handling, extending the fork shovel's service life and ensuring safety during equipment operation.

[0060] The embodiments of the present invention are presented for purposes of illustration and description and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments are chosen and described in order to better illustrate the principles of the invention and its practical application and to enable those skilled in the art to understand the invention and design various embodiments with various modifications as suited for specific applications.

Claims

1. An off-road telescopic forklift with a quick-change fork frame, wherein the output end of the off-road forklift (11) is connected to a boom assembly (12), and the end of the boom assembly (12) is fixedly connected to a fork shovel rack (13), characterized in that: The fork shovel rack (13) includes two parts: a mounting assembly (18) and a connecting assembly (19). The connecting assembly (19) is connected to the mounting assembly (18) by plugging, so that the fork shovel joint part can be easily replaced. Parts of the mounting assembly (18) and parts of the arm assembly (12) are connected by bolt insertion, which facilitates replacement of joints in actual operation; A locking assembly is provided inside the mounting assembly (18), and the locking assembly can accurately adjust the locking strength of the connecting assembly (19) according to the adjustment distance of the fork, thereby ensuring that the entire mechanical structure can operate stably and efficiently under different working conditions.

2. The off-road telescopic forklift with a quick-change fork frame according to claim 1, characterized in that: The mounting assembly (18) includes an arm protection plate (24), the arm protection plate (24) is provided with a middle frame, and the middle frame vertical array is provided with a primary positioning assembly (25) and a secondary positioning assembly (26); The first-level positioning component (25) is arranged above the second-level positioning component (26), and two first-level positioning plates (28) are fixedly provided on the outer surface of the first-level positioning component (25), and the surface of the first-level positioning plate (28) is provided with a first-level circular positioning hole (29), and the outer side of the second-level positioning component (26) is provided with two second-level positioning plates (30) in an array, and the surface of the second-level positioning plate (30) is provided with a second-level circular positioning hole (31).

3. The off-road telescopic forklift with a quick-change fork frame according to claim 2, characterized in that: Two groups of oblique fixing plates are fixedly installed on the back of the first-level positioning component (25) and the second-level positioning component (26), a first-level cross column (33) is connected between the two groups of oblique fixing plates, a second-level cross column (35) is also fixedly connected between the two groups of the first-level cross columns (33), a swing piece (34) is fixedly connected to the outside of the second-level cross column (35), an outer end of the swing piece (34) is provided with a through hole, and a first locking buckle (36) is inserted into the through hole.

4. The off-road telescopic forklift with a quick-change fork carriage according to claim 3, characterized in that: The connecting assembly (19) comprises two sets of horizontal plates (41) arranged vertically, both ends of the two sets of horizontal plates (41) are connected with mounting back plates (37), and the outer sides of the two sets of mounting back plates (37) are fixed with first buckles (38) and second buckles (39); The second buckle (39) is arranged below the first buckle (38), an embedding groove is provided at the connection between the first buckle (38) and the mounting back plate (37), a barb is provided at the connection between the second buckle (39) and the mounting back plate (37), the first buckle (38) and the primary positioning plate (28) are connected in a socket-and-socket manner, and the second buckle (39) and the secondary positioning plate (30) are embedded and limited.

5. The off-road telescopic forklift with a quick-change fork carriage according to claim 4, characterized in that: The locking assembly comprises the first-level cross column (33), an inner cavity (51) is provided inside the first-level cross column (33), a bidirectional motor (46) is fixedly installed in the middle of the inner cavity (51), two output ends of the bidirectional motor (46) are fixedly connected with output shafts (52), the ends of two groups of the output shafts (52) are fixedly connected with locking blocks (53), the outer side of the locking block (53) is fixedly connected with a side airbag (54), and the other end of the side airbag (54) is fixedly connected to the side wall of the inner cavity (51).

6. The off-road telescopic forklift with a quick-change fork carriage according to claim 5, characterized in that: A friction airbag (47) is further provided above the locking block (53), the friction airbag (47) being in communication with the interior of the side airbag (54), a threaded through hole being provided on the locking block (53), a fork shovel being threadedly mounted in the threaded through hole, an air delivery pipe (48) being connected between the secondary cross column (35) and the primary cross column (33), a pressure stabilizing chamber (55) being provided inside the air delivery pipe (48).

7. The off-road telescopic forklift with a quick-change fork carriage according to claim 6, characterized in that: The first-level positioning plate (28) includes a shell, a cavity is provided inside the shell, a second locking buckle (43) is installed in the cavity, the second locking buckle (43) moves inside the first-level circular positioning hole (29), a piston plate (42) is provided on the outside of the second locking buckle (43), a high-pressure chamber is provided between the piston plate (42) and the second locking buckle (43), a return spring (44) is connected between the piston plate (42) and the inner wall of the shell, a connecting pipe (45) is connected to the outside of the shell, and the connecting pipe (45) is communicated with the inside of the pressure-stabilizing chamber (55).

8. The off-road telescopic forklift with a quick-change fork carriage according to claim 7, characterized in that: The outer side of the secondary cross column (35) is movably connected to an outer air tube (49), a protruding air bag hole (50) is provided inside the fork shovel, an elastic air bag is provided inside the protruding air bag hole (50), a cavity is provided inside the fork shovel, the cavity is connected to the elastic air bag and is connected through the outer air tube (49) by a socket connection; when the cavity is inflated, the elastic air bag protrudes from the protruding air bag hole (50) to increase friction.

9. The off-road telescopic forklift with a quick-change fork carriage according to claim 8, characterized in that: The structure of the secondary positioning plate (30) is consistent with that of the primary positioning plate (28). The interior of the secondary positioning plate (30) is connected to the interior of the pressure stabilizing chamber (55). The internal hydraulic pressure of the pressure stabilizing chamber (55) pushes the secondary positioning plate (30) and the second locking buckle (43) provided on the primary positioning plate (28) to achieve a locking connection with the connecting assembly (19).

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