CN218810185U - Portal structure of fork truck - Google Patents

Abstract

The utility model relates to the technical field of fork trucks, and discloses a portal frame structure of a fork truck, which comprises an outer portal frame, a middle portal frame and an inner portal frame which are connected in sequence in a rolling way; outer portal, well portal and interior portal are respectively including two outer gateposts, two well gateposts and two interior gateposts of relative setting, outer gatepost, well gatepost and interior gatepost are H type channel steel and crisscross setting. The utility model provides a fork truck's portal structure is a high lift, antedisplacement formula fork truck portal structure, can realize high lift operation in narrow roadway and constrictive overhead warehouse, and the biggest lifting height can reach 12 meters, fork truck's portal compact structure, intensity and rigidity surpass with specification C type channel steel portal structure, have fine application prospect.

Description

Portal structure of fork truck

Technical Field

The utility model relates to a fork truck technical field specifically is a fork truck's portal structure.

Background

Fork truck belongs to industrial haulage vehicle, refers to the various wheeled haulage vehicle that carries out loading and unloading, stack and short distance transportation operation to finished pallet goods. The tray can be widely applied to ports, stations, airports, goods yards, factory workshops, warehouses, circulation centers, distribution centers and the like, can enter cabins, carriages and containers to carry out loading, unloading and carrying operations of tray goods, and is necessary equipment in tray transportation and container transportation.

The forward-moving forklift is one of storage vehicles and can be divided into a seat forward-moving type and a standing forward-moving type according to an operation mode. The front-moving forklift has small lifting capacity and is often driven by a motor. The forward forklift has the characteristics of flexibility, light operation, no pollution, low noise and the like. The advantages of the electric stacker and the counter weight forklift are combined, when the gantry extends forwards to the top end, the load gravity center falls on the outer side of the fulcrum, and the gantry is equivalent to the counter weight forklift; when the portal frame is completely retracted, the load gravity center falls on the inner side of the fulcrum, and the portal frame is equivalent to an electric stacker. The combination of the two performances ensures that the volume and the dead weight can not be increased greatly while the operation flexibility and the high load performance are ensured, the operation space is saved to the maximum extent, and the utilization rate of the land is greatly improved. Therefore, the material stacking device is suitable for completing material carrying and stacking operation in narrow spaces in the industries of light industry, tobacco, textile, food, supermarkets and the like, is one of indispensable devices for modern storage, and is one of the competitive focuses of all large forklift manufacturers in the world.

The forklift gantry is a working device for stacking goods during forklift operation. At present, the portal frame of the domestic traditional forklift uses deformed steel, and the traditional forklift adopts a structure that C + J type channel steel is arranged in parallel and an oil cylinder is arranged at the rear; the main disadvantages are: 1. the section of the J-shaped channel steel of the inner portal frame is asymmetrical, torsion stress exists in the inner part after the load is applied, and the transverse load capacity is weak. 2. And a guide plate needs to be installed on the C-shaped channel steel of the outer door frame, and the sliding friction resistance is large. 3. When the oil cylinder rear structure can cause the oil cylinder to lift the inner door frame, the inner door frame generates a forward-turning bending moment, and the door frame is additionally provided with a load. 4. The forklift is mostly used for forklifts with the length of 8 meters or less.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned deficiencies of the prior art, in whole or in part, it is an object of the present invention to: the gantry structure of the forklift has the functions of high lifting and forward moving, can realize high lifting operation in narrow roadways and narrow elevated warehouses, and has the maximum lifting height of 12 meters.

In order to realize the purpose of the utility model, the utility model provides a following technical scheme: a novel forklift mast structure comprises an outer mast, a middle mast and an inner mast which are connected in sequence in a rolling way; outer portal, well portal and interior portal are respectively including two outer gateposts, two well gateposts and two interior gateposts of relative setting, outer gatepost, well gatepost and interior gatepost are H type channel steel and crisscross setting. The beneficial effect of this application scheme is: the three door frames are all made of H-shaped steel, so that the occupied space of the door frames is reduced, the specification of the H-shaped steel is large, and the price is low compared with that of C-shaped channel steel.

The outer gantry is provided with a rear lifting oil cylinder, one end of a piston rod of the rear lifting oil cylinder is fixed to the top of the middle gantry, the top of the middle gantry is further provided with a rear cylinder chain wheel, and two ends of a chain surrounding the rear cylinder chain wheel are respectively connected with the top of the outer gantry and the bottom of the inner gantry. The beneficial effect of this application scheme is: the piston rod drives the middle door frame to ascend or descend, and the rear cylinder chain wheel at the top of the middle door frame drives the inner door frame to ascend or descend through the chain.

The fork truck is characterized by further comprising a fork truck frame, wherein a front lifting oil cylinder is arranged on the inner gantry, a front cylinder chain wheel is mounted at one end of a piston rod of the front lifting oil cylinder, and two ends of a chain surrounding the front cylinder chain wheel are respectively connected with the bottom of the inner gantry and the bottom of the fork truck frame; the fork frame is connected with the inner door frame through a roller assembly. The beneficial effect of this application scheme is: the fork frame is driven to ascend or descend by a chain of the front cylinder chain wheel, the front cylinder chain wheel is driven to ascend when the current lifting oil cylinder ascends, and the fork frame ascends under the driving of the chain of the front cylinder chain wheel.

The two rear lifting oil cylinders are respectively arranged on two outer sides of the two outer door columns of the outer door frame. The beneficial effect of this application scheme is: the space in the portal frame is saved, the longitudinal thickness of the portal frame is reduced, the portal frame structure moves backwards, the turning radius of the whole vehicle after the portal frame moves backwards is smaller, the passing performance in narrow and small space is favorably improved, and the use flexibility is higher.

And a plurality of cross beams are respectively arranged between two doorposts on each portal of the outer portal, the middle portal and the inner portal, and reinforcing ribs are respectively arranged on each doorpost of the outer portal and each doorpost of the middle portal. The beneficial effect of this application scheme is: because the rear lifting oil cylinders are arranged on the left side and the right side of the outer portion of the outer door frame, the space in the door frame is saved, the outer door frame, the middle door frame and the inner door frame can be respectively provided with the cross beams, and the reinforcing ribs are respectively arranged on the outer door frame and the two cross columns of the middle door frame, so that under the condition that the width of the door frame is not increased, the emphasis and the rigidity of the door frame structure are increased. Because the rear lifting oil cylinders are arranged on the left side and the right side of the outer portion of the outer door frame, the space in the door frame is saved, reinforcing ribs are only added on the outer door frame and the inner door frame, and the strength of the inner door frame is enough under normal conditions. When the inner door frame needs higher strength, the reinforcing ribs can be arranged on the inner door frame, and at the moment, the width of the whole door frame is adjusted properly.

The roller assembly comprises a roller, and the roller is a composite roller. The composite roller is used, a guide plate is not required to be installed, and the lifting resistance of the gantry is small; the composite roller comprises a main roller and a lateral small roller, and when the gap of the portal frame is adjusted, an adjusting gasket is not required to be installed, so that the assembly, the debugging and the maintenance are more convenient.

The hydraulic pipeline system comprises a front cylinder accessory oil pipe, a front cylinder lifting steel pipe, a rear cylinder accessory oil pipe, a rear cylinder left lifting oil pipe, a rear cylinder right lifting oil pipe, an inner portal accessory steel pipe, a descending speed limiting valve and an outer portal lifting steel pipe, wherein the rear cylinder left lifting oil pipe, the rear cylinder right lifting oil pipe and the outer portal lifting steel pipe are connected.

The front cylinder accessory oil pipe, the front lifting oil cylinder, the front cylinder chain wheel and a chain surrounding the front cylinder chain wheel are arranged in an overlapping mode; the beneficial effect of this application scheme is: the design can reduce the part that shelters from the driver field of vision on the portal like this, creates better observation environment.

The fork carriage comprises a fork carriage, a side shift cylinder and a tilt cylinder, and the side shift and tilt of the fork can be realized under the condition that the mast keeps moving up and down.

The fork frame is the integrated design, compares in traditional outer hanging side shifter, can effectively shorten whole car length.

The chain of preceding cylinder sprocket is single chain structure, further reduces the part that shelters from the driver field of vision on the portal, creates better observation environment.

Compared with the prior art, the utility model discloses there is following beneficial effect at least:

1. the outer door frame, the middle door frame and the inner door frame are all H-shaped channel steel, each door post of the outer door frame and each door post of the middle door frame is respectively provided with a reinforcing rib, and a cross beam is respectively arranged between the two door posts of each door frame of the outer door frame, the middle door frame and the inner door frame, so that the compact structure is realized, and the strength and the rigidity of the door frame structure surpass those of C-shaped channel steel frames with the same specification are achieved; therefore, the novel forklift portal structure can realize high lifting operation in narrow roadways and narrow elevated warehouses, and the maximum lifting height can reach 12 meters.

2. The arrangement of the rear lifting oil cylinders on the left side and the right side of the outer gantry makes the stress of the middle gantry more stable, the debugging of the oil cylinders more convenient, and the space for the rear oil cylinders is also reduced by the longitudinal thickness of the gantry.

3. The chain of the front cylinder chain wheel adopts a single chain structure, the front cylinder accessory oil pipe, the front lifting oil cylinder and the front cylinder chain wheel are arranged in an overlapping mode and also surround the chain of the front cylinder chain wheel, parts which shield the view of a driver on the door frame are eliminated as far as possible, and a better observation environment is created.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained without inventive work, wherein:

fig. 1 is a schematic view of a mast structure assembly of a forklift truck according to the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

FIG. 3 is a top plan view of a half section of the cylinder chain taken along section line B-B of FIG. 2;

FIG. 4 is a top half-sectional view of the roller taken along section line C-C of FIG. 2;

FIG. 5 is a schematic diagram of the operation of the present invention;

FIG. 6 is a schematic diagram of a hydraulic conduit system;

FIG. 7 is a schematic view of a fork carriage;

FIG. 8 is a schematic view of the outer gantry;

FIG. 9 is a schematic view of a center gate;

fig. 10 is a schematic view of the inner gantry.

The symbols in the drawings are: 1. the hydraulic lifting device comprises an outer gantry, 2, a middle gantry, 3, an inner gantry, 4, a fork frame, 5, a rear lifting oil cylinder, 6, a front lifting oil cylinder, 7, a rear cylinder chain wheel, 8, a front cylinder chain wheel, 9, a hydraulic pipeline system, 10, a roller, 11, a rear cylinder accessory oil pipe, 12, an inner gantry accessory steel pipe, 13, a front cylinder accessory oil pipe, 14, a descending speed limiting valve, 15, an outer gantry lifting steel pipe, 16, a rear cylinder left lifting oil pipe, 17, a rear cylinder right lifting oil pipe, 18, a front cylinder lifting oil pipe, 19, a front cylinder lifting steel pipe, 20, a fork frame, 21, a sliding frame, 22, a side shifting oil cylinder, 23, a tilting oil cylinder, 24, a cross beam, 25 and reinforcing ribs.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it should be apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Example 1:

a mast for a forklift truck, as shown in figures 1-4, comprising: outer mast 1, middle mast 2, inner mast 3 and fork carriage 4. The outer gantry 1, the middle gantry 2, the inner gantry 3 and the fork frame 4 realize relative movement in the vertical direction through the idler wheels 10, the idler wheels 10 are composite idler wheels, guide plates do not need to be installed when the composite idler wheels are used, and the lifting resistance of the gantries is small; the composite roller comprises a main roller and a lateral small roller, and when the gap of the portal frame is adjusted, an adjusting gasket is not required to be installed, so that the assembly, the debugging and the maintenance are more convenient.

As shown in fig. 5, rear lifting cylinders 5 are respectively installed on the left and right sides of the outer portion of the outer gantry 1, and the upper ends of piston rods of the rear lifting cylinders 5 are fixed on the middle gantry 2. The back cylinder chain wheel 7 is installed at the top of the middle door frame 2, the two ends of a chain surrounding the back cylinder chain wheel 7 are respectively connected with the upper end of the outer door frame 1 and the lower end of the inner door frame 3, the chain of the front cylinder chain wheel 7 is of a single chain structure, parts, which are arranged on the door frame and used for shielding the view of a driver, are further reduced, and a better observation environment is created. The rear lifting oil cylinders 5 are respectively arranged on the left side and the right side of the outer portion of the outer door frame 1, so that the space in the door frame is saved, and the width of the door frame does not need to be increased. The chain on the chain wheel 7 can also be a steel rope or a steel belt, and the steel rope and the steel belt can be matched with a winding device to replace the chain wheel 7.

The left and right doorposts of the outer portal 1, the middle portal 2 and the inner portal 3 are all made of H-shaped channel steel, and outer door rollers are respectively arranged on the upper inner side of the left outer doorpost and the upper inner side of the right outer doorpost; the upper part of the inner side of the left middle doorpost and the upper part of the inner side of the right middle doorpost are respectively provided with a middle upper doorroller, and the lower part of the outer side of the left middle doorpost and the lower part of the outer side of the right middle doorpost are respectively provided with a middle lower doorroller; the lower part of the outer side of the left inner doorpost and the lower part of the outer side of the right inner doorpost are respectively provided with an inner door roller; the outer portal frame 1 is sleeved on the middle portal frame 2, so that the inner side of the left outer portal column and the outer side of the left middle portal column are in a staggered buckling shape, and the inner side of the right outer portal column and the outer side of the right middle portal column are in a staggered buckling shape. The middle door frame 2 is sleeved on the inner door frame 3, so that the inner side of the left middle door post and the outer side of the left inner door post are in a staggered buckling shape, and the inner side of the right middle door post and the outer side of the right inner door post are in a staggered buckling shape. The outer door frame 1 of traditional C type channel-section steel need wrap up well door frame 2, just so need outer door frame 1 bulky, and this kind of large-scale channel-section steel requires highly, generally needs the import just can obtain.

The back plays to rise hydro-cylinder 5 and can arrange in the 1 left and right sides of portal, the piston rod supports in 2 both sides of well portal, make 2 atresss of well portal more stable, play to rise the hydro-cylinder 5 and be located whole portal the inside or preceding condition behind the tradition, the space that plays to rise the hydro-cylinder 5 after this design has also reduced the vertical thickness of portal, make the portal structure move backward, the whole car turning radius after the portal moves backward is littleer, be favorable to improving the trafficability characteristic in narrow and small space, use the flexibility higher.

Compared with the traditional design that C-shaped channel steel is used as a portal, the H-shaped channel steel has the advantages of symmetrical section, large transverse load and small volume; traditional C type channel-section steel needs a plastic pad piece, fills channel-section steel and gyro wheel clearance, and H shaped steel then need not additionally add the plastic pad piece because its unique molding, can also rise hydro-cylinder 5 and do not additionally increase the width after the 1 left and right sides of outer portal sets up.

As shown in fig. 8-10, in the present application, each of the doorposts of the outer portal 1 and the middle portal 2 is provided with a plurality of reinforcing ribs 25, a plurality of cross beams 24 are respectively provided between the two doorposts of each of the outer portal 1, the middle portal 2 and the inner portal 3, and two ends of the cross beam 24 are respectively provided on the two doorposts. The number of beams 24 on each portal is no less than two and are arranged in sequence between two doorposts. Further improve the intensity and the rigidity of whole portal, reduce the deflection of portal in the work.

As shown in fig. 1, the gantry structure is further provided with a hydraulic pipeline system 9, and the hydraulic pipeline system 9 comprises a lateral movement pipeline, an inclination pipeline and a lifting pipeline and is responsible for communicating the valve bank with each oil cylinder.

As shown in fig. 6, the hydraulic line system 9 specifically includes: the device comprises a front cylinder accessory oil pipe 13, a front cylinder lifting oil pipe 18, a front cylinder lifting steel pipe 19, a rear cylinder accessory oil pipe 11, a rear cylinder left lifting oil pipe 16, a rear cylinder right lifting oil pipe 17, an inner gantry accessory steel pipe 12, a descending speed limiting valve 14 and an outer gantry lifting steel pipe 15, wherein the rear cylinder left lifting oil pipe 16, the rear cylinder right lifting oil pipe 17 and the outer gantry lifting steel pipe 15 are connected.

A front lifting oil cylinder 6 is arranged on the inner gantry 3, a front cylinder chain wheel 8 is arranged at the upper end of a piston rod of the front lifting oil cylinder 6, and two ends of a chain surrounding the front cylinder chain wheel 8 are respectively connected with the lower end of the inner gantry 3 and the lower end of the fork frame 4. The front cylinder accessory oil pipe 13, the front lifting oil cylinder 6, the front cylinder chain wheel 8 and a chain surrounding the front cylinder chain wheel 8 are arranged in an overlapping mode; the design can reduce the part that shelters from the driver field of vision on the portal like this, creates better observation environment.

As shown in fig. 7, the fork carriage 4 includes a fork carriage 20, a carriage 21, a side shift cylinder 22 and a tilt cylinder 23, which are designed to ensure that side shift and tilt motion of the fork carriage 4 is achieved while the mast remains up and down. The fork frame 4 is an integrated design, and compared with the traditional externally-hung lateral shifter, the length of the whole truck can be effectively shortened.

When the portal frame rises, the pressure required by the front lifting oil cylinder 6 is smaller than that of the rear lifting oil cylinder 5, so that the front lifting oil cylinder 6 is lifted preferentially, at the moment, the outer portal frame 1, the middle portal frame 2, the inner portal frame 3 and the rear lifting oil cylinder 5 are in a static state, and only the fork frame 4 is lifted under the action of the front lifting oil cylinder 6 and the chain. And after the motion of the current lifting oil cylinder 6 is stopped when reaching the terminal, the rear lifting oil cylinder 5 starts to work to drive the middle portal frame 2 and the inner portal frame 3 to lift until the stroke of the rear lifting oil cylinder 5 is finished. The descending sequence of the portal frames is opposite, the rear lifting oil cylinder 5 descends firstly, and the front lifting oil cylinder 6 starts to control the fork frame 4 to descend when the middle portal frame 2 and the inner portal frame 3 descend to the bottom end; lifting is completed when the fork carriage 4 is lowered to the lowermost end.

The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all of which utilize the equivalent structure or equivalent flow transformation made by the content of the specification of the present invention, or directly or indirectly applied to other related technical fields, all included in the same way in the patent protection scope of the present invention.

Claims (10)

1. A mast structure of a forklift, comprising: the outer portal (1), the middle portal (2) and the inner portal (3) are connected in sequence in a rolling manner; outer portal (1), well portal (2) and interior portal (3) are respectively including two outer gateposts, two well gateposts and two interior gateposts of relative setting, outer gatepost, well gatepost and interior gatepost are H type channel steel and crisscross setting.

2. The mast structure of the forklift truck according to claim 1, wherein the outer mast (1) is provided with a rear lifting cylinder (5), one end of a piston rod of the rear lifting cylinder (5) is fixed on the top of the middle mast (2), the top of the middle mast (2) is further provided with a rear cylinder chain wheel (7), and two ends of a chain surrounding the rear cylinder chain wheel (7) are respectively connected with the top of the outer mast (1) and the bottom of the inner mast (3).

3. The mast structure of a forklift truck according to claim 2, further comprising a fork carriage (4), wherein a front lifting cylinder (6) is provided on the inner mast (3), a front cylinder chain wheel (8) is mounted at one end of a piston rod of the front lifting cylinder (6), and both ends of a chain surrounding the front cylinder chain wheel (8) are respectively connected with the bottom of the inner mast (3) and the bottom of the fork carriage (4); the fork frame (4) is connected with the inner gantry (3) through a roller wheel assembly.

4. The mast structure of a forklift truck according to claim 2, characterized in that the number of the rear lifting cylinders (5) is two, and the rear lifting cylinders are respectively mounted on two outer sides of two outer masts of the outer mast (1).

5. The mast structure of a fork-lift truck according to claim 1, characterized in that, between two masts on each of said outer mast (1), said middle mast (2) and said inner mast (3) there are provided a plurality of cross beams (24), respectively, and on each mast of said outer mast (1) and said middle mast (2) there is provided a reinforcement bar (25), respectively.

6. Mast structure of a forklift truck according to claim 3, characterized in that: the roller assembly comprises a roller (10), and the roller (10) is a composite roller.

7. Mast structure of a forklift truck according to claim 3, characterized in that: still contain hydraulic piping system (9), hydraulic piping system (9) play to rise oil pipe (16), the back jar right side and play to rise oil pipe (17) and outer portal and play to rise steel pipe (15) including back jar left side, back jar right side plays to rise oil pipe (16), the back jar plays to rise oil pipe (17) and outer portal and plays to rise steel pipe (15) and link to each other.

8. Mast structure of a forklift truck according to claim 7, characterized in that: the hydraulic pipeline system (9) further comprises a front cylinder accessory oil pipe (13), and the front cylinder accessory oil pipe (13), the front lifting oil cylinder (6), the front cylinder chain wheel (8) and a chain surrounding the front cylinder chain wheel (8) are arranged in an overlapping mode.

9. Mast structure of a forklift truck according to claim 3, characterized in that: the fork frame (4) is of an integrated design and comprises a fork frame (20), a sliding frame (21) connected with the fork frame (20), and a side shifting oil cylinder (22) and a tilting oil cylinder (23) which are arranged on the fork frame (20) and the sliding frame (21).

10. Mast structure of a forklift truck according to claim 3, characterized in that: the chain of the front cylinder chain wheel (8) is of a single chain structure.

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