A forklift mast and forklift

Abstract

This utility model discloses a forklift mast and forklift, including a mast body and a fork carriage. A plurality of first roller groups are provided between the fork carriage and the mast body for relative sliding in a vertical direction. These first roller groups are arranged side-by-side along the left-right direction of the fork carriage. Each first roller group includes multiple rollers disposed on the same side of the fork carriage and distributed vertically. The multiple rollers also include at least two second main rollers located between the first upper main roller and the first lower main roller. Furthermore, the multiple rollers also include at least one second side roller located between the first upper side roller and the first lower side roller. By increasing the number of rollers, this utility model improves the stress distribution on the rollers, thereby reducing the risk of roller failure due to overload and enhancing the overall stability between the fork carriage and the mast body.

Description

Technical Field

[0001] This utility model relates to the field of forklift technology, and in particular to a forklift mast and forklift. Background Technology

[0002] The forklift mast is a key component that enables the forklift's functionality, and its performance has a crucial impact on the overall performance of the forklift. A forklift mast typically consists of the mast body and the fork carriage. The fork carriage is connected to the mast body by multiple roller assemblies, which allow the fork carriage to move vertically relative to the mast body, thereby lifting or lowering goods. However, in existing technology, the roller assemblies are usually mounted on the fork carriage. This presents the following problems under special heavy-duty conditions: the rollers of the fork carriage and the corresponding steel sections of the mast body are subjected to severe stress, which can easily lead to roller failure. Simultaneously, the steel flanges are prone to deformation or even outward rotation. Utility Model Content

[0003] This utility model addresses the technical problems existing in the prior art by providing a forklift mast and forklift, which greatly improves the stress on the rollers on the fork carriage and the corresponding steel of the mast body through structural improvements.

[0004] The technical solution adopted by this utility model to solve its technical problem is as follows: a forklift mast, including a mast body and a fork carriage, wherein a plurality of first roller groups are provided between the fork carriage and the mast body for sliding relative to each other in the vertical direction, the plurality of first roller groups being arranged side by side along the left and right direction of the fork carriage; each first roller group includes a plurality of rollers disposed on the same side of the fork carriage and distributed in the vertical direction; the plurality of rollers include a first upper main roller, a first lower main roller, a first upper side roller, and a first lower side roller, the plurality of rollers further including at least two second main rollers located between the first upper main roller and the first lower main roller; the plurality of rollers further includes at least one second side roller located between the first upper side roller and the first lower side roller.

[0005] In a preferred embodiment, the axial distance between the first upper main roller and the first lower main roller is 550-750mm; the axial distance between the first upper side roller and the first lower side roller is 420-600mm; the at least two second main rollers include a second upper main roller and a second lower main roller, the second upper main roller being disposed close to the first upper main roller and the second lower main roller being disposed close to the first lower main roller; the at least one second side roller includes a second upper side roller, which is disposed close to the first upper side roller.

[0006] In a preferred embodiment, the first upper roller is located between the first upper main roller and the second upper main roller; the first lower main roller and the first lower side roller are integrated together to form a first composite roller; and the second upper main roller and the second upper side roller are integrated together to form a second composite roller.

[0007] In a preferred embodiment, the fork carriage includes a main frame and two fixing plates fixed to the side of the main frame facing the mast body. The two fixing plates are arranged side by side along the left-right direction of the fork carriage, and each fixing plate extends in the up-down direction. Each fixing plate is connected to the main frame by a first reinforcing rib plate. A first roller assembly is installed on the opposite outer side of the two fixing plates, and the first upper main roller is located at the top of the fixing plate, and the first lower main roller is located at the bottom of the fixing plate.

[0008] In a preferred embodiment, the mast body includes an inner mast, a middle mast, and an outer mast. A plurality of second roller sets are provided between the inner mast and the middle mast for relative sliding in the vertical direction. A plurality of third roller sets are provided between the middle mast and the outer mast for relative sliding in the vertical direction. The first roller set is located between the fork carriage and the inner mast. A first drive mechanism for driving the inner mast and the middle mast to rise and fall is provided between the outer mast and the inner mast. A second drive mechanism for driving the fork carriage to rise and fall is provided between the inner mast and the fork carriage.

[0009] In a preferred embodiment, a central crossbeam is connected to the middle of the outer gantry. The central crossbeam includes a main body and two connecting plates. The two ends of the main body are welded and fixed to the two connecting plates one by one. The two connecting plates are welded to the opposite outer sides of the left and right columns of the outer gantry.

[0010] In a preferred embodiment, a lower crossbeam is welded to the bottom of the outer gantry, and the lower crossbeam is provided with an unloading groove, which is located near the welding part between the lower crossbeam and the outer gantry.

[0011] In a preferred embodiment, the lower crossbeam is straight, and both ends of one side of the lower crossbeam in the width direction are welded to the outer frame. The two end faces of the lower crossbeam are respectively provided with the unloading groove, which runs vertically through the lower crossbeam and extends through the other side of the lower crossbeam in the width direction.

[0012] In a preferred embodiment, a first upper crossbeam is connected to the top of the outer gantry, and a second upper crossbeam is connected to the top of the middle gantry.

[0013] In a preferred embodiment, the opposite outer sides of the left and right columns of the outer mast are respectively provided with second reinforcing ribs at the end near the fork carriage. The second reinforcing ribs are elongated and extend in the vertical direction, so that the left and right columns of the outer mast have J-shaped cross sections at the locations where the second reinforcing ribs are provided.

[0014] This utility model also provides a forklift, including the forklift mast as described above.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. Because the multiple rollers of this utility model include a first upper main roller, a first lower main roller, a first upper side roller, a first lower side roller, and at least two second main rollers and at least one second side roller, each first roller group includes at least four main rollers and at least three side rollers. Therefore, compared with the prior art, this utility model increases the number of rollers, which can distribute the weight and load of the fork carriage to more rollers. When more rollers share the load, the force borne by each roller will decrease, thereby reducing the risk of roller failure due to overload. At the same time, because the load is distributed to more support points, the stress distribution on the corresponding steel of the mast body is more uniform, reducing local stress concentration, thereby reducing the risk of deformation and outward turning of the steel flange, and extending the service life of the mast body.

[0017] 2. This invention sets the shaft spacing between the first upper main roller and the first lower main roller to 550-750mm, and the shaft spacing between the first upper side roller and the first lower side roller to 420-600mm. Compared with the prior art, this invention increases the shaft spacing between the uppermost and lowermost rollers. According to the principle of torque balance, this improves the stress distribution on the rollers, thereby further reducing the risk of roller failure due to overload. Increasing the roller spacing also improves the overall stability between the fork carriage and the mast body. Furthermore, due to the increased roller spacing, the concentrated torque acting on the corresponding steel sections of the mast body is distributed over a longer span, further reducing local stress concentration and thus reducing the deformation of the steel flanges, especially further reducing the outward tilting phenomenon caused by overload.

[0018] 3. The application of composite rollers reduces the number of parts and space occupation, making the entire gantry structure more compact, and reducing the installation steps and time of the rollers, thus improving assembly efficiency.

[0019] 4. This utility model connects a first reinforcing rib between the main frame and the fixed plate of the fork carriage, which greatly improves the overall structural strength and stability of the fork carriage.

[0020] 5. The main body of the gantry of this utility model includes an inner gantry, a middle gantry, and an outer gantry, forming a three-level support structure. This structure effectively reduces the length of the steel profile of each gantry level, while enhancing the stability and reliability of the entire gantry body.

[0021] 6. The central crossbeam of the outer gantry comprises the main body of the crossbeam and two connecting plates, resulting in a three-section spliced ​​structure for the central crossbeam. Compared to the traditional one-piece central crossbeam, this significantly reduces the stringent requirements for machining precision. Furthermore, the width of the two connecting plates can be made relatively large, resulting in a larger welding area with the outer gantry. By dispersing stress, this effectively reduces stress concentration, thereby significantly lowering the risk of breakage of the central crossbeam during use and improving the overall structural reliability and durability.

[0022] 7. The lower crossbeam at the bottom of the outer gantry is provided with a load-bearing groove in the area near the welding part (i.e. the high stress area of ​​the lower crossbeam). By reducing the local area, the rigidity is reduced, and excessive stress concentration is avoided. This reduces the risk of tearing of the welded part of the lower crossbeam under high load, and improves the reliability and durability of the lower crossbeam.

[0023] 8. The left and right columns of the outer mast are provided with second reinforcing ribs on their opposite outer sides near the fork carriage, so that the left and right columns of the outer mast have J-shaped cross sections at the locations where the second reinforcing ribs are provided. Compared with the C-shaped cross section of the prior art, this improves the torsional stiffness, significantly improves the lateral swaying in heavy-duty industries, and enhances the lateral stability of the outer mast.

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, the forklift mast and forklift of the present invention are not limited to the embodiments. Attached Figure Description

[0025] Figure 1 This is a three-dimensional structural schematic diagram of the forklift mast of this utility model;

[0026] Figure 2 This is a three-dimensional structural diagram (including forks) of the fork carriage and the first roller assembly of this utility model in a combined state;

[0027] Figure 3 yes Figure 2 Side view;

[0028] Figure 4 This is a front view of the forklift mast of this utility model;

[0029] Figure 5 This is a top view of the forklift mast of this utility model;

[0030] In the diagram, 1. Fork carriage; 11. Main frame; 12. Fixing plate; 13. First reinforcing rib plate; 2. First roller assembly; 21. First upper main roller; 22. First lower main roller; 23. First upper side roller; 24. First lower side roller; 25. Second upper main roller; 26. Second lower main roller; 27. Second upper side roller; 3. Outer mast; 31. First upper crossbeam; 32. Middle crossbeam; 321. Crossbeam body; 322. Connecting plate; 33. Lower crossbeam; 331. Unloading groove; 4. Middle mast; 41. Second upper crossbeam; 5. Inner mast; 6. Second roller assembly; 7. Third roller assembly; 8. First hydraulic cylinder; 81. First sprocket; 82. First chain; 9. Second hydraulic cylinder; 91. Second sprocket; 92. Second chain; 10. Fork. Detailed Implementation

[0031] In this utility model, the terms "first," "second," and "third," etc., are used only to distinguish similar objects, not to describe a specific order or sequence, nor should they be construed as indicating or implying relative importance. The use of terms such as "upper," "lower," "left," "right," "front," "rear," "inner," "outer," and "top / bottom" to indicate orientation or positional relationships is based on the orientation or positional relationships shown in the accompanying drawings, and is only for the convenience of describing this utility model, not to indicate or imply that the device referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the scope of protection of this utility model. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0032] In addition, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0033] Please see Figures 1-5 As shown, a forklift mast of this utility model includes a mast body and a fork carriage 1. A plurality of first roller groups 2 are provided between the fork carriage 1 and the mast body for relative sliding in the vertical direction. These first roller groups 2 are arranged side-by-side along the left-right direction of the fork carriage 1. Each first roller group 2 includes a plurality of rollers disposed on the same side of the fork carriage 1 and distributed in the vertical direction. Specifically, the plurality of rollers includes a first upper master roller 21, a first lower master roller 22, a first upper side roller 23, and a first lower side roller 24. The plurality of rollers also includes at least two second master rollers located between the first upper master roller 23 and the first lower master roller 24; and at least one second side roller located between the first upper side roller 23 and the first lower side roller 24.

[0034] The first upper main roller 21 is located above the first lower main roller 22, and the distance between their axes is 550-750mm, with a preferred value of 600mm. The first upper side roller 23 is located above the first lower side roller 24, and the distance between their axes is 420-600mm, with a preferred value of 510mm. Therefore, compared with the prior art (the distance between the uppermost and lower main rollers in the prior art is about 520mm, and the distance between the uppermost and lower side rollers is about 320mm), this invention significantly increases the distance between the uppermost and lower main rollers / side rollers, which can improve the stress on the rollers, improve the overall stability between the fork carriage 1 and the mast body, reduce the local stress concentration phenomenon in the mast body, and reduce the deformation of the steel wing plate.

[0035] In a preferred embodiment, the at least two second main rollers include a second upper main roller 25 and a second lower main roller 26. The second upper main roller 25 is disposed near the first upper main roller 21, and the second lower main roller 26 is disposed near the first lower main roller 22. The at least one second roller includes a second upper side roller 27, which is disposed near the first upper side roller 23. Therefore, each roller group includes at least four main rollers and at least three side rollers. Specifically, in this embodiment, taking each first roller group 2 as an example, which includes four main rollers and three side rollers, the number of first roller groups 2 is specifically two groups. Therefore, the two first roller groups 2 of this invention together include a total of eight main rollers and six side rollers.

[0036] The first upper roller 23 is located between the first upper main roller 21 and the second upper main roller 25. The first lower main roller 22 and the first lower side roller 24 are integrated together to form a first composite roller, and the second upper main roller 25 and the second upper side roller 27 are integrated together to form a second composite roller. This reduces the number of components and space occupied by the two first roller assemblies 2, making the entire gantry structure more compact, reducing the installation steps and time, and improving assembly efficiency.

[0037] like Figure 2 As shown, the fork carriage 1 includes a main frame 11 and two fixing plates 12 welded and fixed to the main frame 11 on the side facing the mast body. The two fixing plates 12 are arranged side by side along the left-right direction of the fork carriage 1, and each fixing plate 12 extends in the up-down direction. Each fixing plate 12 is welded to the main frame 11 with a first reinforcing rib plate 13. The setting of the first reinforcing rib plate 13 greatly improves the overall structural strength and stability of the fork carriage 1. A first roller group 2 is installed on the opposite outer side of the two fixing plates 12, and the first upper main roller 21 is located at the top of the fixing plate 12, and the first lower main roller 22 is located at the bottom of the fixing plate 12.

[0038] In this embodiment, the mast body includes an inner mast 5, a middle mast 4, and an outer mast 3. A plurality of second roller sets 6 are provided between the inner mast 5 and the middle mast 4 for relative sliding in the vertical direction. A plurality of third roller sets 7 are provided between the middle mast 4 and the outer mast 3 for relative sliding in the vertical direction. The aforementioned first roller set 2 is located between the fork carriage 1 and the inner mast 5. A first drive mechanism for driving the inner mast 5 and the middle mast 4 to rise and fall is provided between the outer mast 3 and the inner mast 5. A second drive mechanism for driving the fork carriage 1 to rise and fall is provided between the inner mast 5 and the fork carriage 1.

[0039] The top of the outer gantry 3 is connected to a first upper crossbeam 31, and the top of the middle gantry 4 is connected to a second upper crossbeam 41. A middle crossbeam 32 is connected to the middle of the outer gantry 3. This middle crossbeam 32 includes a crossbeam body 321 and two connecting plates 322. The two ends of the crossbeam body 321 are welded to the two connecting plates 322 one by one. The two connecting plates 322 are welded to the opposite outer sides of the left and right columns of the outer gantry 3. Therefore, the middle crossbeam 32 of this invention adopts a three-segment splicing structure, which significantly reduces the stringent requirements for processing precision compared to the traditional one-piece middle crossbeam. Furthermore, the width of the two connecting plates 322 can be made relatively large, resulting in a larger welding area with the outer gantry 3. This disperses stress and effectively reduces stress concentration, thereby significantly reducing the risk of breakage of the middle crossbeam 32 during use and improving the reliability and durability of the overall structure.

[0040] A lower crossbeam 33 is welded to the bottom of the outer gantry 3. This lower crossbeam 33 has a load-bearing groove 331, which is located near the welded joint between the lower crossbeam 33 and the outer gantry 3. Specifically, in this embodiment, the lower crossbeam 33 is straight. Both ends of one side of the lower crossbeam 33 in its width direction are welded to the outer gantry 3. The aforementioned load-bearing groove 331 is provided on both end faces of the lower crossbeam 33, extending vertically and through the other side of the lower crossbeam 33 in its width direction. In this embodiment, the load-bearing groove 331 is approximately L-shaped, but not limited to this. The welded joint of the lower crossbeam 33 is a high-stress area. This invention provides the load-bearing groove 331 near this high-stress area, reducing the local area to weaken the rigidity of this area and indirectly increasing its flexibility. This avoids excessive stress concentration, thereby reducing the risk of tearing at the welded joint of the lower crossbeam 33 under high load, and thus improving the reliability and durability of the lower crossbeam 33.

[0041] The left and right uprights of the outer mast 3 are made of channel steel. At the end near the fork carriage 1, the opposite outer surfaces of the left and right uprights of the outer mast 3 are each provided with a second reinforcing rib plate 34. This second reinforcing rib plate 34 is elongated and extends vertically, giving the left and right uprights of the outer mast 3 a J-shaped cross-section at the location where the second reinforcing rib plate 34 is provided. Compared to the existing C-shaped cross-section, this design improves torsional stiffness, significantly reduces lateral swaying in heavy-duty applications, and enhances the lateral stability of the outer mast 3.

[0042] The first drive mechanism includes two first hydraulic cylinders 8, which are mounted side-by-side on the outer mast 3. The piston rods of the two first hydraulic cylinders 8 extend upwards, and each piston rod end is provided with a first sprocket 81. A first chain 82 is wound around the first sprocket 81, with both ends of the first chain 82 pointing downwards. One end of the first chain 82 is connected to the outer mast 3, and the other end is connected to the inner mast 5. The second drive mechanism includes a second hydraulic cylinder 9, which is mounted on the inner mast 5. The piston rod of the second hydraulic cylinder 9 extends upwards and is provided with two coaxially arranged second sprockets 91. A second chain 92 is wound around each second sprocket 91, with both ends of the second chain 92 pointing downwards. One end of the second chain 92 is connected to the inner mast 5, and the other end is connected to the fork carriage 1, so as to drive the fork carriage 1 to slide up and down relative to the inner mast 5.

[0043] Compared to existing technologies, this invention increases the number of rollers in the first roller group 2 (changing from six main rollers and four side rollers in the prior art to eight main rollers and six side rollers). This distributes the weight and load of the fork carriage 1 across more rollers. When more rollers share the load, the force on each roller decreases, thus reducing the risk of roller failure due to overload. Simultaneously, because the load is distributed to more support points, the stress distribution on the inner mast 5 steel is more uniform, reducing localized stress concentration and thus lowering the risk of deformation and outward tilting of the steel flange, extending the service life of the mast body.

[0044] This utility model discloses a forklift mast that further increases the axle spacing between the first upper main roller 21 and the first lower main roller 22, as well as the axle spacing between the first upper side roller 23 and the first lower side roller 24. This results in a more dispersed distribution of contact points between the rollers and the inner mast 5, and reduces the force borne by the uppermost and lowermost main rollers and side rollers. This is because, according to the principle of torque balance, when the distance between the points of application of torque increases, the force borne by each point of application decreases accordingly. Taking the main roller as an example, as... Figure 3 As shown, torque balance is established with the first lower main roller 22 as the fulcrum (ignoring the weight of the gantry):

[0045] F1*L1=F2*L2

[0046] Wherein, F1 represents the load borne by the forks 10 on the fork carriage 1, L1 represents the horizontal distance between the center of gravity of the cargo and the fulcrum, F2 represents the force borne by the first upper main roller 21, and L2 represents the axial distance between the first upper main roller 21 and the first lower main roller 22.

[0047] According to the principle of torque balance, with the weight and center of gravity of the goods remaining constant, increasing the lever arm L2 can reduce the magnitude of F2, thereby reducing the force on the first upper main roller 21 and thus lowering the risk of failure of the first upper main roller 21 and the first lower main roller 22 due to overload. Similarly, the same applies to the first upper side roller 23 and the first lower side roller 24.

[0048] Furthermore, the increased axle spacing between the first upper main roller 21 and the first lower main roller 22 distributes the concentrated moment acting on the inner gantry 5 steel section over a longer span. This results in a more uniform stress distribution on the steel section flange, reducing localized stress concentration. According to the principle of moment balance, as the distance between the points of application of the moment increases, the maximum bending moment on the steel section flange also decreases accordingly. Therefore, the degree of deformation of the flange is reduced, especially reducing the outward folding phenomenon caused by overload.

[0049] Increasing the axle spacing between the first upper main roller 21 and the first lower main roller 22 improves overall stability: the wider support span gives the entire system stronger resistance to overturning when subjected to external forces. According to the principle of torque balance, as the distance between support points increases, the system's anti-overturning torque also increases accordingly. This helps improve the forklift's operational stability under heavy loads and reduces safety hazards caused by instability.

[0050] This utility model adds a second upper crossbeam 41 between the cylinder support 42 of the middle gantry 4, which improves the torsional resistance of the middle gantry 4. The inner gantry 5 and the middle gantry 4 are both made of J-shaped steel (i.e., the cross section is J-shaped). The outer gantry 3 is changed from C-shaped steel to J-shaped steel. The change of cross section improves the torsional stiffness, which significantly improves the lateral stability of the gantry body and significantly reduces the lateral swaying phenomenon.

[0051] This utility model discloses a forklift, including a forklift mast as described above. For details regarding the structure and related principles of the forklift mast, please refer to the preceding description, which will not be repeated here.

[0052] The present invention relates to a forklift mast and forklift. The parts not described herein are the same as or can be implemented using existing technologies.

[0053] The above embodiments are only used to further illustrate a forklift mast and forklift of the present invention. However, the present invention is not limited to the embodiments. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A forklift mast comprising a mast body and a fork carriage, a plurality of first roller sets for allowing the mast body and the fork carriage to slide relative to each other in a vertical direction are provided between the mast body and the fork carriage, and the plurality of first roller sets are arranged side by side in a horizontal direction of the fork carriage; each of the first roller sets comprises a plurality of rollers arranged on a same side of the fork carriage and distributed in the vertical direction; characterized in that: The plurality of rollers includes a first upper main roller, a first lower main roller, a first upper side roller, and a first lower side roller. The plurality of rollers also includes at least two second main rollers located between the first upper main roller and the first lower main roller. The plurality of rollers also includes at least one second side roller located between the first upper side roller and the first lower side roller.

2. The fork truck mast according to claim 1, wherein: The axial distance between the first upper main roller and the first lower main roller is 550-750mm; the axial distance between the first upper side roller and the first lower side roller is 420-600mm; the at least two second main rollers include a second upper main roller and a second lower main roller, the second upper main roller being disposed close to the first upper main roller and the second lower main roller being disposed close to the first lower main roller; the at least one second side roller includes a second upper side roller, which is disposed close to the first upper roller.

3. The fork truck mast according to claim 2, wherein: The first upper roller is located between the first upper main roller and the second upper main roller; the first lower main roller and the first lower side roller are integrated together to form a first composite roller; the second upper main roller and the second upper side roller are integrated together to form a second composite roller.

4. The fork truck mast according to claim 1, wherein: The fork carriage includes a main frame and two fixing plates fixed to the side of the main frame facing the mast body. The two fixing plates are arranged side by side along the left-right direction of the fork carriage, and each fixing plate extends in the up-down direction. Each fixing plate is connected to the main frame by a first reinforcing rib plate. A first roller assembly is installed on the opposite outer side of the two fixing plates, and the first upper main roller is located at the top of the fixing plate, and the first lower main roller is located at the bottom of the fixing plate.

5. The fork truck mast according to claim 1, wherein: The mast body includes an inner mast, a middle mast, and an outer mast. Multiple second roller sets are provided between the inner mast and the middle mast for relative sliding in the vertical direction. Multiple third roller sets are provided between the middle mast and the outer mast for relative sliding in the vertical direction. The first roller set is located between the fork carriage and the inner mast. A first drive mechanism for driving the inner mast and the middle mast to rise and fall is provided between the outer mast and the inner mast. A second drive mechanism for driving the fork carriage to rise and fall is provided between the inner mast and the fork carriage.

6. The fork truck mast according to claim 5, wherein: The top of the outer gantry is connected to a first upper crossbeam, and the top of the middle gantry is connected to a second upper crossbeam; the middle of the outer gantry is connected to a middle crossbeam, which includes a crossbeam body and two connecting plates. The two ends of the crossbeam body are welded and fixed to the two connecting plates one by one, and the two connecting plates are welded to the opposite outer sides of the left and right columns of the outer gantry.

7. The fork truck mast according to claim 5, wherein: The bottom of the outer gantry is welded with a lower crossbeam, which is provided with an unloading groove. The unloading groove is located near the welding part between the lower crossbeam and the outer gantry. The lower crossbeam is straight, and its two ends are welded to the outer frame on one side in the width direction. The unloading groove is provided on the two end faces of the lower crossbeam. The unloading groove runs vertically through the lower crossbeam and extends through the other side in the width direction.

8. The fork truck mast according to claim 5, wherein: The top of the outer gantry is connected to a first upper crossbeam, and the top of the middle gantry is connected to a second upper crossbeam.

9. The fork truck mast according to claim 5, wherein: The opposite outer side surfaces of the left and right upright columns of the outer mast are respectively provided with second reinforcing rib plates at one end close to the fork frame, the second reinforcing rib plates are long strips and extend in the up-down direction, so that the left and right upright columns of the outer mast respectively have J-shaped cross sections at the positions provided with the second reinforcing rib plates.

10. A fork truck characterized by: A fork-lift truck mast comprising a fork-lift truck mast according to any one of claims 1-9.

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