Forklift portal frame applied to impact working condition

Abstract

The utility model discloses a forklift portal frame applied to an impact working condition, which comprises an inner portal frame, an outer portal frame, a goods blocking frame, a fork arm carrier, an oil cylinder, a roller and a side roller, and the upper end of the outer portal frame is provided with an outer portal frame roller shaft and a threaded hole; the lower end of the inner door frame is provided with an inner door frame roller shaft and a threaded hole; fork arm carrier roller shafts and threaded holes are arranged at the upper end and the lower end of the fork arm carrier, and the threaded holes are used for skid-mounting of side rollers; the roller comprises an outer ring and an inner ring, the inner ring is connected with the outer gantry roller shaft, the inner gantry roller shaft and the fork arm carrier roller shaft, double rows of steel balls and a retainer are arranged between the inner ring and the outer ring, the retainer is used for uniformly separating the plurality of steel balls in each row, and the outer ring and the inner ring are sealed through a sealing piece. The forklift portal frame is simplified in structure and low in cost, the durability of the idler wheels is effectively improved, and the failure rate is reduced. The rigidity is enhanced through an outer wrapping structure, high-position transverse deformation is reduced, and safety is improved. And the fork arm carrier is high in strength and adapts to severe working conditions.

Description

Technical Field

[0001] The utility model relates to the technical field of forklift design and manufacturing, in particular to a forklift door frame used in impact working conditions. Background Art

[0002] The mast of a forklift is an important part of the forklift to realize its function, and the performance of the mast is an important factor affecting the overall performance of the forklift. In the actual use of forklifts, forklifts are not only used for transporting and stacking goods, but also often encounter some working conditions such as dragging and impact. In such working conditions, the rollers are very easy to be damaged. The most common is the cracking of the outer ring of the roller. The size of the roller is affected by the cross-section of the mast channel steel, which will cause the wall thickness of the outer ring to be limited. There is no problem in using it under normal working conditions, but when it is subjected to impact conditions such as impact, the outer ring of the roller is easy to be damaged. For example, in the aluminum industry, steel mills, stone and other industries, forklifts are often equipped with accessories to flip aluminum liquid or clean slag. At this time, the mast rollers will often withstand front and rear impacts, causing the outer ring of the roller to crack.

[0003] Therefore, it is urgent to design a forklift gantry that can meet the needs. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a forklift gantry for use in impact working conditions, which requires improving the force on the rollers and increasing the ability of the rollers to withstand impact loads so that the gantry can work normally under the impact working conditions.

[0005] The technical problem to be solved by the utility model is achieved through the following technical solutions:

[0006] A forklift mast used in impact conditions, comprising an outer mast, an inner mast, a shelf, a fork frame, an oil cylinder, a roller and a side roller, wherein the upper end of the outer mast is provided with an outer mast roller shaft and a threaded hole; the lower end of the inner mast is provided with an inner mast roller shaft and a threaded hole; the upper and lower ends of the fork frame are both provided with a fork frame roller shaft and a threaded hole, and the threaded holes are used to pry the side rollers; the roller comprises: an outer ring, a steel ball, a retaining frame, an inner ring and a sealing member, the inner ring is connected with the outer mast roller shaft, the inner mast roller shaft and the fork frame roller shaft, the outer ring is arranged on the outside of the inner ring, a double row of steel balls and a retaining frame are arranged between the inner ring and the outer ring, the retaining frame is used to evenly separate a plurality of steel balls on each row and guide them to roll, and the sealing member is arranged between the outer ring and the inner ring to seal the steel balls and the retaining frame.

[0007] Preferably, the outer mast comprises a channel steel structure consisting of a left channel steel of the outer mast and a right channel steel of the outer mast, the outer mast roller shaft is arranged above the right channel steel of the outer mast, and a frame structure, a support structure and a lower crossbeam assembly are arranged on the channel steel structure from top to bottom, and the bottom of the oil cylinder is placed on the bottom plate of the lower crossbeam assembly.

[0008] Preferably, the frame structure includes an upper crossbeam of the outer portal, a support plate, and a chain plate. The upper crossbeam of the outer portal and the chain plate are parallel and the ends of both are connected to the channel steel structure. The support plate is vertically connected to the upper crossbeam of the outer portal and the chain plate.

[0009] Preferably, the supporting structure comprises a tilt cylinder support and a middle cross beam, the tilt cylinder support is used to connect the cylinder, and the middle cross beam is used to increase the rigidity of the outer mast in the left and right directions.

[0010] Preferably, the inner mast comprises an inner mast left channel steel, an inner mast upper crossbeam, an inner mast right channel steel and an inner mast lower crossbeam, two inner mast roller shafts are welded below the left channel steel of the inner mast, a threaded hole for fixing the side rollers is provided between the two inner mast roller shafts, a cylinder head sprocket seat is provided above the right channel steel of the inner mast, the top of the piston rod of the oil cylinder is connected to the cylinder head sprocket seat, and when the oil cylinder is lifted, the piston rod pushes the inner mast to slide upward in the channel steel of the outer mast.

[0011] Preferably, the fork frame includes a column plate, the upper end of which is provided with a fork frame roller shaft and a threaded hole, and the lower end of which is provided with two fork frame roller shafts and threaded holes, the threaded holes are used to pry the side rollers, and the fork frame roller shafts are connected to the rollers.

[0012] Preferably, the fork frame also includes an integral frame formed by welding an upper crossbeam of the fork frame, a lower crossbeam of the fork frame, a support plate and a side upright plate together, and reinforcing ribs and triangular ribs are also provided at the connection between the column plate and the upper crossbeam of the fork frame to strengthen the connection, and a side plate is provided on the outer side of the integral frame.

[0013] Preferably, the forklift mast further comprises a shelf guard, and the shelf guard is connected to the fork frame or the inner mast.

[0014] The above technical solution of the utility model has the following beneficial effects:

[0015] (1) The gantry has a simple structure and low cost. It uses the simplest structure to solve the gantry damage problem under special harsh working conditions, improve the service life of the gantry roller, and reduce the gantry failure rate;

[0016] (2) The upper crossbeam and middle crossbeam of the outer mast are both outsourced to increase the rigidity of the mast in the left and right directions, reduce the lateral deformation of the mast when in a high position, and improve the overall safety performance of the mast;

[0017] (3) A set of rollers is added to the inner mast and fork frame to reduce the force on the rollers and improve the force on the mast;

[0018] (4) The fork frame has high structural strength and small deformation, which can better cope with harsh working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention.

[0020] Figure 1 The utility model is a schematic structural diagram of a forklift mast applied in impact working conditions.

[0021] Figure 2 This is another perspective schematic diagram of the forklift mast of the utility model applied to impact conditions.

[0022] Figure 3 This is a schematic diagram of the structure of the outer door frame.

[0023] Figure 4 This is a schematic diagram of the structure of the inner door frame.

[0024] Figure 5 It is a structural diagram of the fork frame.

[0025] Figure 6 The schematic diagram of the installation of the roller is shown in FIG.

[0026] Figure 7 It is a schematic diagram of the structure of the roller.

[0027] Among them: 1-outer mast, 11-outer mast upper crossbeam, 12-support plate, 13-chain plate, 14-outer mast left channel steel, 15-tilt cylinder support, 16-middle crossbeam, 17-lower crossbeam assembly, 18-outer mast right channel steel, 19-outer mast roller shaft, 2-inner mast, 21-inner mast roller shaft, 22-inner mast left channel steel, 23-inner mast upper crossbeam, 24-cylinder head sprocket seat, 25-inner mast right channel steel , 26-inner door frame lower beam, 3-shelf stop, 4-fork frame, 41-reinforcement rib, 42-column plate, 43-fork frame upper beam, 44-side vertical plate, 45-side plate, 46-fork frame lower beam, 47-support plate, 48-fork frame roller shaft, 49-triangular rib, 5-lifting cylinder, 6-main roller, 61-outer ring, 62-steel ball, 63-retaining frame, 64-inner ring, 65-seal, 7-side roller. DETAILED DESCRIPTION

[0028] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0029] As shown in the figure, a forklift mast used in impact working conditions includes: an outer mast 1, an inner mast 2, a shelf 3, a fork frame 4, a cylinder 5, a roller 6, a side roller 7, etc. The outer mast 1, the inner mast 2, the shelf 3, the fork frame 4, and the cylinder 5 are all conventional connection methods for forklift masts. The bottom of the cylinder 5 is connected to the outer mast 1, and the top is connected to the inner mast 2. Rollers 6 are installed on the roller shafts of the outer mast 1 and the inner mast 2. The rollers 6 can roll in the channel steels of the outer mast 1 and the inner mast 2. The rollers 6 mainly bear the force in the front and rear directions of the mast, and the side rollers 7 bear the force in the left and right directions of the mast. These rollers play a guiding role to ensure the smooth operation of the mast during the lifting process. When the piston rod of the cylinder 5 is lifted, it drives the inner mast 2 to lift upward. The bottom of the cylinder 5 is fixed to the lower crossbeam assembly 17 of the outer mast 1, and the top of the piston rod is connected to the cylinder head sprocket seat 24 of the inner mast 2. When the piston rod of the oil cylinder 5 is lifted, the inner mast 2 is driven to lift upward, so as to realize the lifting and lowering of the fork frame 4. The shelf 3 is connected to the inner mast 2 or the fork frame 4.

[0030] The outer mast 1 includes an outer mast upper crossbeam 11, a support plate 12, a chain plate 13, an outer mast left channel steel 14, a tilting cylinder support 15, a middle crossbeam 16, a lower crossbeam assembly 17, an outer mast right channel steel 18, and an outer mast roller shaft 19. Specifically, the outer mast left channel steel 14 and the outer mast right channel steel 18 are located on the left and right sides as vertical supports, and threaded holes are punched on the two channel steels for prying the side rollers 7. The outer mast roller shaft 19 is welded above the outer mast 1 to install the rollers 6. The outer mast upper crossbeam 11, the support plate 12, and the chain plate 13 are located at the upper part of the entire outer mast, and the three form a frame structure to provide support and connection. The tilting cylinder support 15 and the middle crossbeam 16 form an outsourcing structure and are located in the middle of the entire outer mast 1, which can increase the rigidity of the mast in the left and right directions, reduce the lateral deformation of the mast when it is in a high position, and improve the overall safety performance of the mast. The lower crossbeam assembly 17 is arranged at the lower part of the outer mast 1 . The function of the lower crossbeam assembly 17 is related to the installation and fixation of the oil cylinder 5 . Specifically, the bottom of the oil cylinder 5 is placed on the bottom plate of the lower crossbeam assembly 17 .

[0031] The inner mast 2 includes an inner mast roller shaft 21, an inner mast left channel steel 22, an inner mast upper crossbeam 23, a cylinder head sprocket seat 24, an inner mast right channel steel 25, and an inner mast lower crossbeam 26. Specifically, the inner mast left channel steel 22 and the inner mast right channel steel 25 are opposite to the outer mast left channel steel 14 and the outer mast right channel steel 18 of the outer mast 1, and threaded holes are punched on the two channel steels for prying the side roller 7. The inner mast roller shaft 21 is welded to the bottom of the inner mast 2 for installing the roller 6. The inner mast upper crossbeam 23 and the inner mast lower crossbeam 26 are respectively located at the upper and lower ends of the inner mast 2, and the left and right ends of the inner mast upper crossbeam 23 and the inner mast lower crossbeam 26 are welded to the inner mast left channel steel 22 and the inner mast right channel steel 25 to form the overall frame of the inner mast 2. The cylinder head sprocket seat 24 is arranged on the upper part of the inner mast 2, and the top of the piston rod of the oil cylinder 5 is directly fixed in the circular groove in the cylinder head sprocket seat 24. When the oil cylinder 5 is lifted, the piston rod moves upward against the inner mast 2.

[0032] The fork frame 4 includes reinforcing ribs 41, column plates 42, upper cross beams 43 for the fork frame, side vertical plates 44, side plates 45, lower cross beams 46 for the fork frame, support plates 47, roller shafts 48 for the fork frame, and triangular ribs 49. Specifically, the column plate 42 is one of the main supporting structures of the fork frame, which is connected to the roller shaft 48 for the fork frame, and threaded holes are punched on the column plate 42 for prying the side rollers 7. The upper cross beams 43 for the fork frame, the lower cross beams 46 for the fork frame, the support plates 47 and the side vertical plates 44 are welded together to form the overall frame of the fork frame 4, on which forks or other forklift accessories can be installed. Among them, the upper crossbeam 43 of the fork frame and the lower crossbeam 46 of the fork frame are directly welded to the column plate 42 to provide stability and bearing capacity. The side vertical plate 44 and the support plate 47 are welded between the upper crossbeam 43 of the fork frame and the lower crossbeam 46 of the fork frame to increase the overall rigidity of the fork frame and reduce the deformation of the fork frame when carrying goods. The reinforcing rib 41 is used to increase the weld strength between the column plate 42 and the upper crossbeam 43 of the fork frame, and at the same time increase the left and right support of the column plate 42 to reduce the deformation of the column plate 42 when subjected to lateral force. The side plate 45 is set on the outer side of the upper crossbeam 43 of the fork frame and the lower crossbeam 46 of the fork frame to provide support and protection. Three groups of fork frame roller shafts 48 are welded on the column plate 42, including two groups of fork frame roller shafts 48 at the bottom and one group of fork frame roller shafts 48 at the top. The triangular ribs 49 are used to strengthen the connection between the column plate 42 and the upper crossbeam 43 and the lower crossbeam 46 of the fork frame.

[0033] Rollers 6 and side rollers 7. A group of main rollers 6 and a group of side rollers 7 are installed on the outer mast 1, two groups of rollers 6 and a group of side rollers 7 are installed under the inner mast 2, and three groups of main rollers 6 and two groups of side rollers 7 are installed on the fork frame 4, wherein the main rollers 6 are used to bear the forces in the front and rear directions, and the side rollers 7 are used to bear the forces in the left and right directions; generally, under such impact conditions, most of them are low cargo position conditions, so the rollers under the mast are more easily damaged. Two groups of rollers 6 are used under the fork frame 4 and the inner mast 2 to reduce the local roller force and prevent roller damage. Specifically: the roller 6 includes an outer ring 61, a steel ball 62, a retaining frame 63, an inner ring 64, and a seal 65. The outer ring 61 is the fixed part of the roller 6, which is usually fixed at the corresponding position of the mast and provides an external structure for the roller. Compared with the conventional outer ring, the wall thickness of the outer ring 61 of the present application is increased to improve the impact resistance of the roller. Steel balls 62, the roller 6 contains multiple steel balls inside, which roll inside the roller, reduce the friction between the roller and the portal channel steel, and allow the roller to roll smoothly inside the channel steel. The steel ball 62 is the main body of the roller 6 for bearing and rolling. The present application adopts a double-row ball roller, reduces the ball diameter, increases the number of balls, ensures the bearing capacity of the roller, and maintains a small friction force, which helps to improve the efficiency and performance of the forklift. At the same time, the wall thickness of the outer ring of the roller can be increased, which helps to improve the durability and reliability of the roller when it is subjected to impact loads, and greatly improves the impact resistance of the roller. The retaining frame 63 is used to fix the steel balls 62, ensure that they are properly arranged inside the roller, and prevent them from colliding with each other or falling off. The retaining frame 63 helps to evenly distribute the load and reduce wear. The inner ring 64 is a component that cooperates with the roller shaft and can usually rotate. The inner ring 64 contacts the steel balls 62, and the steel balls roll on the raceway of the inner ring to support the rotation of the roller. The seal 65 is used to seal the roller to prevent dust, moisture and other pollutants from entering the roller, and also to reduce the leakage of grease or lubricating oil to maintain the lubrication of the roller.

[0034] Although the utility model has been disclosed as above by the embodiments, it is not intended to limit the utility model. Any technical personnel in this field can make various choices and modifications without departing from the spirit and scope of the utility model. Therefore, the protection scope of the utility model is limited by the claims and their equivalents.

Claims

1. A forklift mast used in impact working conditions, comprising an outer mast (1), an inner mast (2), a shelf backstop (3), a fork frame (4), an oil cylinder (5), a roller (6) and a side roller (7), characterized in that: The upper end of the outer mast (1) is provided with an outer mast roller shaft (19) and a threaded hole; the lower end of the inner mast (2) is provided with an inner mast roller shaft (21) and a threaded hole; the upper and lower ends of the fork frame (4) are provided with a fork frame roller shaft (48) and a threaded hole, and the threaded holes are used to pry the side roller (7); the roller (6) includes: an outer ring (61), a steel ball (62), a retaining frame (63), an inner ring (64) and a sealing member (65), and the inner ring (64) is respectively connected to the outer mast roller shaft (19), The inner mast roller shaft (21) and the fork frame roller shaft (48) are connected, the outer ring (61) is arranged on the outside of the inner ring (64), and a double row of steel balls (62) and a retaining frame (63) are arranged between the inner ring (64) and the outer ring (61). The retaining frame (63) is used to evenly separate the multiple steel balls (62) in each row and guide them to roll. The sealing member (65) is arranged between the outer ring (61) and the inner ring (64) to seal the steel balls (62) and the retaining frame (63).

2. The forklift mast used in impact conditions according to claim 1, characterized in that: The outer door frame (1) comprises a channel steel structure consisting of an outer door frame left channel steel (14) and an outer door frame right channel steel (18); the outer door frame roller shaft (19) is arranged above the outer door frame right channel steel (18); the channel steel structure is provided with a frame structure, a support structure and a lower crossbeam assembly (17) in sequence from top to bottom; the bottom of the oil cylinder (5) is placed on the bottom plate of the lower crossbeam assembly 17.

3. The forklift mast used in impact conditions according to claim 2, characterized in that: The frame structure comprises an upper crossbeam (11) of an outer door frame, a support plate (12), and a chain plate (13); the upper crossbeam (11) of the outer door frame and the chain plate (13) are parallel and the ends of both are connected to the channel steel structure; the support plate (12) is vertically connected to the upper crossbeam (11) of the outer door frame and the chain plate (13).

4. The forklift mast used in impact conditions according to claim 3, characterized in that: The supporting structure comprises a tilting cylinder support (15) and a middle cross beam (16); the tilting cylinder support (15) is used to connect the cylinder, and the middle cross beam (16) is used to increase the rigidity of the outer mast (1) in the left and right directions.

5. The forklift mast used in impact conditions according to claim 1, characterized in that: The inner door frame (2) comprises an inner door frame left channel steel (22), an inner door frame upper cross beam (23), an inner door frame right channel steel (25) and an inner door frame lower cross beam (26); two inner door frame roller shafts (21) are welded below the inner door frame left channel steel (22); a threaded hole for fixing and installing the side roller (7) is provided between the two inner door frame roller shafts (21); a cylinder head sprocket seat (24) is provided above the inner door frame right channel steel (25); the top of the piston rod of the oil cylinder (5) is connected to the cylinder head sprocket seat (24); when the oil cylinder (5) is lifted, the piston rod pushes the inner door frame (2) and slides upward in the channel steel of the outer door frame (1).

6. The forklift mast used in impact conditions according to claim 1, characterized in that: The fork frame (4) comprises a column plate (42), the upper end of the column plate (42) is provided with a fork frame roller shaft (48) and a threaded hole, and the lower end is provided with two fork frame roller shafts (48) and threaded holes, the threaded holes are used to pry the side rollers (7), and the fork frame roller shafts (48) are connected to the rollers (6).

7. The forklift mast used in impact conditions according to claim 6, characterized in that: The fork frame (4) also includes an integral frame formed by welding an upper crossbeam (43) of the fork frame, a lower crossbeam (46) of the fork frame, a support plate (47) and a side upright plate (44) together. A reinforcing rib (41) and a triangular rib (49) are provided at the connection between the upright plate (42) and the upper crossbeam (43) of the fork frame to strengthen the connection. A side plate (45) is provided on the outer side of the integral frame.

8. The forklift mast used in impact conditions according to claim 1, characterized in that: The forklift mast also includes a shelf backstop (3), and the shelf backstop (3) is connected to the fork frame (4) or the inner mast (2).

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