Free lifting oil cylinder and chain fixing structure, forklift portal frame and forklift

Abstract

The utility model discloses a free lifting oil cylinder and chain fixing structure, a forklift portal frame and a forklift, the free lifting oil cylinder and chain fixing structure comprises a free lifting oil cylinder, a chain and a cross beam, the chain is hung on a chain wheel arranged at the top of the free lifting oil cylinder, and one end of the chain is used for being connected with a fork arm carrier; the cross beam comprises a connecting seat and two connecting arms which are distributed left and right, the opposite inner ends of the two connecting arms are fixedly connected with the connecting seat respectively, the top end of the connecting seat is higher than the connecting arms, and a height difference space between the top end of the connecting seat and the connecting arms forms an observation area for a forklift operator to observe the pallet fork; a cylinder body of the free lifting oil cylinder is installed on the connecting base, and the other end of the chain is connected to the cylinder body of the free lifting oil cylinder or the connecting base. The cross beam is of a three-section structure, stress concentration can be reduced, the middle section space of the cross beam is large, the oil cylinder can be freely lifted, the other end of the chain can be conveniently installed and maintained, a forklift operator can observe the loading condition of a pallet fork at any time, and therefore operation safety is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of forklifts, in particular to a free-lift oil cylinder and a chain fixing structure, a forklift mast and a forklift. Background Art

[0002] At present, a forklift mast of the prior art usually consists of an inner mast, an outer mast, a fork carriage, etc. The inner mast is slidably connected to the outer mast in the up-and-down direction, and a free-lift oil cylinder is installed on the inner mast. A sprocket is installed at the top of the free-lift oil cylinder, and a chain is hung on the sprocket. One end of the chain is connected to the fork carriage, and the other end of the chain is connected to the cylinder body of the free-lift oil cylinder or the carrier where the free-lift oil cylinder is located. When the piston rod of the free-lift oil cylinder extends, the chain is driven by the sprocket to lift the fork carriage and the forks fixed thereon; when the piston rod of the free-lift oil cylinder retracts, the fork carriage and its forks, etc. descend by gravity. The above-mentioned free-lift oil cylinder is usually installed on an integral cross beam connected to the inner mast. Specifically, a fixing plate is welded above the cross beam for fixing the free-lift oil cylinder and the other end of the chain. However, this method will result in a narrow installation space for the free-lift oil cylinder, which is not convenient for installation adjustment and maintenance. Moreover, the view of the forklift operator is blocked, which is not convenient for observing the loading condition of the forks and is prone to stress concentration. Summary of the Utility Model

[0003] Aiming at the technical problems existing in the prior art, the utility model provides a free-lift oil cylinder and a chain fixing structure, a forklift mast and a forklift, which improve the convenience of installation and maintenance and the viewing range through structural improvement.

[0004] The technical solution adopted by the utility model to solve its technical problems is: a free-lift oil cylinder and a chain fixing structure, including a free-lift oil cylinder, a chain and a cross beam. The free-lift oil cylinder is arranged vertically, the chain is hung on the sprocket arranged at the top of the free-lift oil cylinder, and one end of the chain is used for connecting to the fork carriage; the cross beam includes a connecting seat and two connecting arms distributed left and right. The relative inner ends of the two connecting arms are respectively fixedly connected to the connecting seat. The top end of the connecting seat is higher than the connecting arms, and the height difference space between the top end of the connecting seat and the connecting arms forms an observation area for the forklift operator to observe the forks; the cylinder body of the free-lift oil cylinder is installed on the connecting seat, and the other end of the chain is connected to the cylinder body of the free-lift oil cylinder or the connecting seat.

[0005] Further, the two connecting arms are respectively in the shape of a dovetail with a narrow inner part and a wide outer part.

[0006] Further, the relative inner ends of the two connecting arms are respectively welded and fixed to the connecting seat, and the welding position is on one side of the connecting seat in the front-rear direction.

[0007] Further, a convex block protruding from one side in the front-rear direction is provided at the top of the connecting seat. The convex block is provided with a through hole penetrating up and down. The other end of the chain is connected to the through hole by a bolt assembly. The connecting seat is provided with a hollow opening penetrating through in the front-rear direction below the through hole to facilitate the installation or adjustment of the bolt assembly.

[0008] Further, the cylinder block of the free-lift cylinder is installed on one side of the connecting seat in the front-rear direction, and the other end of the chain is connected to the other side of the connecting seat in the front-rear direction.

[0009] Further, a convex block protruding from the other side in the front-rear direction is provided at the top of the connecting seat. The convex block is provided with a through hole penetrating up and down. The other end of the chain is connected to the through hole by a bolt assembly. The connecting seat is provided with a hollow opening penetrating through in the front-rear direction below the through hole to facilitate the installation or adjustment of the bolt assembly.

[0010] Further, the cylinder block of the free-lift cylinder is clamped by the connecting seat and the connected limiting member. The limiting member has an arc-shaped inner surface adapted to the outer surface of the cylinder block of the free-lift cylinder. The part of the connecting seat in contact with the cylinder block of the free-lift cylinder is recessed to form an arc surface to be adapted to the outer surface of the cylinder block of the free-lift cylinder.

[0011] Further, the left and right ends of the limiting member are respectively fixedly connected to the connecting seat by fasteners. The fasteners are fastening screws, which are threadedly connected to the corresponding threaded holes provided in the connecting seat.

[0012] Further, the two connecting arms are respectively bent into a Z shape, so that the relative inner ends and relative outer ends of the two connecting arms are staggered in the front-rear direction.

[0013] The present utility model further provides a forklift mast, including an outer mast, an inner mast and a fork carriage. The inner mast is slidably connected to the outer mast up and down. The fork carriage is fixed to the bottom of the inner mast, and forks are arranged on the fork carriage; it further includes the free-lift cylinder and the chain fixing structure as described in the above-mentioned present utility model. The relative outer ends of the two connecting arms are respectively fixedly connected to the inner mast, and one end of the chain is connected to the fork carriage.

[0014] The present utility model further provides a forklift, including the forklift mast as described in the above-mentioned present utility model.

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

[0016] 1. Since the crossbeam of the utility model includes the two connecting arms and the connecting seat, the crossbeam of the utility model forms a three-section structure, which can reduce stress concentration and make the space in the middle section larger, which is convenient for the installation and maintenance of the free lifting cylinder and the other end of the chain. In addition, the height difference space between the top of the connecting seat and the connecting arm can be used to form an observation area for the forklift operator to observe the fork, so that the forklift operator can observe the loading condition of the fork at any time during work, thereby improving the safety of operation.

[0017] 2. The two connecting arms are dovetail-shaped with a narrow inside and a wide outside, which can further reduce stress concentration and improve the strength of the door frame.

[0018] 3. The setting of the hollow opening can further increase the operable space of the connecting seat, making the other end of the chain easier to install and maintain.

[0019] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments; however, the free lifting cylinder and chain fixing structure, forklift mast and forklift of the present invention are not limited to the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a three-dimensional schematic diagram of the fixed structure of the utility model. Figure 1 (Including inner door frame, showing partial);

[0021] Figure 2 This is a three-dimensional schematic diagram of the fixed structure of the utility model. Figure 2 (Including inner door frame, showing partial);

[0022] Figure 3 It is a three-dimensional structural schematic diagram of the crossbeam of the utility model;

[0023] Figure 4 This is a schematic diagram of the three-dimensional structure of the connecting seat of the utility model. Figure 1 ;

[0024] Figure 5 This is a schematic diagram of the three-dimensional structure of the connecting seat of the utility model. Figure 2 ;

[0025] Figure 6 It is a three-dimensional structural schematic diagram of the forklift of the utility model (representing a part);

[0026] In the figure, 1. free lifting cylinder, 2. chain, 3. connecting arm, 4. connecting seat, 41. protrusion, 411. through hole, 42. hollow opening, 43. arc surface, 44. threaded hole, 5. bolt assembly, 6. limit piece, 7. fastening screw, 8. inner mast, 9. outer mast, 10. fork, 20. observation area. DETAILED DESCRIPTION

[0027] In the present utility model, in the description, the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "back", "inner", "outer", "top / bottom end", etc. is based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the present utility model, rather than indicating or implying that the device referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the protection scope of the present utility model. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0028] In addition, in the description of the present utility model, unless otherwise clearly specified and limited, terms such as "installation", "setting", "connection", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium. It can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0029] Please refer to Figures 1 - 6 As shown, a free-lifting oil cylinder and chain fixing structure of the present utility model includes a free-lifting oil cylinder 1, a chain 2 and a cross beam. The free-lifting oil cylinder 1 is arranged vertically. The chain 2 is hung on a sprocket (not shown in the figure) provided at the top of the free-lifting oil cylinder 1, and one end of the chain 2 is used to connect to a fork carriage. The cross beam includes a connecting seat 4 and two connecting arms 3 distributed left and right. The relative inner ends of the two connecting arms 3 are respectively fixedly connected to the connecting seat 4. The top end of the connecting seat 4 is higher than the connecting arms 3, and the height difference space between the top end of the connecting seat 4 and the connecting arms 3 forms an observation area 20 for the forklift operator to observe the forks. The cylinder block of the free-lifting oil cylinder 1 is installed on the connecting seat 4, and the other end of the chain 2 is connected to the cylinder block of the free-lifting oil cylinder 1 or the connecting seat 4. Specifically, in this embodiment, the other end of the chain 2 is connected to the connecting seat 4, and the cylinder block of the free-lifting oil cylinder 1 is installed on one side of the connecting seat 4 in the front-rear direction, and the other end of the chain 2 is connected to the other side of the connecting seat 4 in the front-rear direction.

[0030] As a preferred method, the two connecting arms 3 of the present utility model are respectively in the shape of a dovetail with a narrow inner part and a wide outer part. The "narrow inner part and wide outer part" means that the relative inner ends of the two connecting arms 3 are narrow and the relative outer ends of the two connecting arms 3 are wide. And, the two connecting arms 3 are respectively bent into a Z shape, so that the relative inner ends of the two connecting arms 3 and the relative outer ends of the two connecting arms 3 are staggered front and back. In this way, when installing the cross beam, the connecting seat 4 of the cross beam can be biased to one side in the front-rear direction to facilitate space avoidance.

[0031] In this embodiment, the relative inner ends of the two connecting arms 3 are respectively welded and fixed to the connecting seat 4, and the welding positions are located on one side of the connecting seat 4 in the front-rear direction. In other embodiments, the relative inner ends of the two connecting arms 3 are respectively fixedly connected to the connecting seat 4 by bolt assemblies or other fixing members.

[0032] In this embodiment, a convex block 41 protruding from the other side in the front-rear direction is provided on the top of the connecting seat 4. The convex block 41 is provided with a through hole 411 penetrating up and down. The other end of the chain 2 is connected to the through hole 411 by a bolt assembly 5. The bolt assembly 5 includes a bolt and its cooperating nut, etc. The connecting seat 4 is provided with a hollow opening 42 penetrating front and back below the through hole 411. The hollow opening 42 can increase the operable space of the connecting seat 4 to facilitate the installation or adjustment of the bolt assembly 5, so that the other end of the chain 2 is more convenient for installation and maintenance.

[0033] In this embodiment, the cylinder block of the free-lifting oil cylinder 1 is tightened by the connecting seat 4 and the limiting member 6 connected to the bottom thereof. The left and right ends of the limiting member 6 are respectively fixedly connected to the connecting seat 4 by fastening members. The fastening members are fastening screws 7, which are threadedly connected to the corresponding threaded holes 44 provided on the connecting seat 4. The limiting member 6 has an arc-shaped inner surface adapted to the outer surface of the cylinder block of the free-lifting oil cylinder 1. The portion of the connecting seat 4 in contact with the cylinder block of the free-lifting oil cylinder 1 is recessed to form an arc surface 43 to be adapted to the outer surface of the cylinder block of the free-lifting oil cylinder 1.

[0034] Therefore, for a fixed structure of a free-lifting oil cylinder and a chain of the present utility model, its cross beam constitutes a three-section structure, which can reduce stress concentration and make the middle section have a larger space, facilitating the installation and maintenance of the free-lifting oil cylinder 1 and the other end of the chain 2. Moreover, it can utilize the height difference space between the top end of the connecting seat 4 and the connecting arm 3 to form an observation area 20 for the forklift operator to observe the forklift forks 10. As Figure 6 shown, it shows that the forklift operator observes outwards through the observation area 20 from the forklift cab. Figure 6 The circular dotted line in the figure indicates the observation area 20 on the left side of the connecting seat 4, and the same is true for the observation area on the right side of the connecting seat 4. Therefore, the present utility model enables the forklift operator to observe the loading condition of the forklift forks 10 at any time during work, thereby improving the operation safety. The two connecting arms 3 of the present utility model are respectively in the shape of a dovetail with a narrow inner part and a wide outer part, which can further reduce stress concentration and improve the strength of the gantry.

[0035] Please refer to Figures 1 - 6As shown in the figure, a forklift mast of the present utility model includes an outer mast 9, an inner mast 8, and a fork carriage (not shown in the figure). The inner mast 8 is slidably connected to the outer mast 9 in the vertical direction. The fork carriage is fixed to the bottom of the inner mast 8, and forks 10 are provided on the fork carriage. The forklift mast of the present utility model further includes the free lift cylinder and the chain fixing structure of the present utility model as described above. The opposite outer ends of the two connecting arms 3 are respectively fixedly connected to the inner mast 8, and one end of the chain 2 is connected to the fork carriage. Specifically, in this embodiment, the opposite outer ends of the two connecting arms 3 are respectively connected to the middle position of the inner mast 8 by welding, but the connection manner between the opposite outer ends of the two connecting arms 3 and the inner mast 8 is not limited to this.

[0036] For the structure and related descriptions of the free lift cylinder and the chain fixing structure of a forklift mast of the present utility model, please refer to the previous description part, and details will not be repeated here.

[0037] A forklift of the present utility model includes the forklift mast as described in the present utility model above.

[0038] For the free lift cylinder and the chain fixing structure, the forklift mast, and the forklift of the present utility model, the parts not involved are the same as the prior art or can be implemented by the prior art.

[0039] The above embodiments are only used to further illustrate a free lift cylinder and the chain fixing structure, the forklift mast, and the forklift of the present utility model. However, the present utility model is not limited to the embodiments. Any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present utility model all fall within the protection scope of the technical solution of the present utility model.

Claims

1. A free lifting cylinder and chain fixing structure, comprising a free lifting cylinder, a chain and a crossbeam, wherein the free lifting cylinder is arranged vertically, the chain is hung on a sprocket arranged on the top of the free lifting cylinder, and one end of the chain is used to connect to a fork frame; characterized in that: The crossbeam includes a connecting seat and two connecting arms distributed on the left and right, the opposite inner ends of the two connecting arms are respectively fixedly connected to the connecting seat, the top of the connecting seat is higher than the connecting arm, and the height difference space between the top of the connecting seat and the connecting arm forms an observation area for a forklift operator to observe the forks; the cylinder body of the free lifting cylinder is installed on the connecting seat, and the other end of the chain is connected to the cylinder body or the connecting seat of the free lifting cylinder.

2. The free lifting cylinder and chain fixing structure according to claim 1, characterized in that: The two connecting arms are respectively in a dovetail shape with a narrow inner side and a wide outer side.

3. The free lifting cylinder and chain fixing structure according to claim 1, characterized in that: The opposite inner ends of the two connecting arms are respectively welded and fixed to the connecting seat, and the welding position is located on one side of the connecting seat in the front-rear direction.

4. The free lifting cylinder and chain fixing structure according to claim 1, characterized in that: The cylinder body of the free lifting cylinder is installed on one side of the connecting seat in the front-rear direction, and the other end of the chain is connected to the other side of the connecting seat in the front-rear direction.

5. The free lifting cylinder and chain fixing structure according to claim 4, characterized in that: The top of the connecting seat is provided with a protruding block protruding from the other side along the front-to-back direction, and the protruding block is provided with a through hole penetrating from top to bottom. The other end of the chain is connected to the through hole by a bolt assembly, and the connecting seat is provided with a hollow opening penetrating from front to back below the through hole to facilitate the installation or adjustment of the bolt assembly.

6. The free lifting cylinder and chain fixing structure according to claim 4 or 5, characterized in that: The cylinder body of the free lift cylinder is clamped by the connecting seat and the limiting member connected thereto, the limiting member has an arc-shaped inner surface adapted to the outer surface of the cylinder body of the free lift cylinder, and the portion where the connecting seat contacts the cylinder body of the free lift cylinder is recessed to form an arc surface to adapt to the outer surface of the cylinder body of the free lift cylinder.

7. The free lifting cylinder and chain fixing structure according to claim 6, characterized in that: The left and right ends of the limiter are respectively fixedly connected to the connection seat by fasteners, and the fasteners are fastening screws, which are threadedly connected to threaded holes correspondingly arranged on the connection seat.

8. The free lifting cylinder and chain fixing structure according to claim 1 or 2, characterized in that: The two connecting arms are bent into a Z shape respectively, so that the relative inner ends of the two connecting arms and the relative outer ends of the two connecting arms are staggered front and back.

9. A forklift mast, comprising an outer mast, an inner mast and a fork frame, wherein the inner mast is connected to the outer mast in a manner that the inner mast can slide up and down, the fork frame is fixed to the bottom of the inner mast, and a fork is arranged on the fork frame; characterized in that: It also includes a free lifting cylinder and chain fixing structure as described in any one of claims 1 to 8, wherein the relative outer ends of the two connecting arms are respectively fixedly connected to the inner mast, and one end of the chain is connected to the fork frame.

10. A forklift, characterized in that: Comprising the forklift mast as claimed in claim 9.

Images