CN112125236B

CN112125236B - Forklift and portal frame thereof

Info

Publication number: CN112125236B
Application number: CN201910551372.6A
Authority: CN
Inventors: 詹承煜
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2019-06-24
Filing date: 2019-06-24
Publication date: 2022-06-10
Anticipated expiration: 2039-06-24
Also published as: CN112125236A

Abstract

The utility model relates to a fork truck and portal thereof, this fork truck portal includes: the door frame body is used for being mounted on a forklift frame; a fork carriage slidably connected to the gantry body for mounting a cargo accessory; the fork frame is provided with a leveling mechanism which is used for adjusting the angle of the goods placing accessory so that the goods placing surface of the goods placing accessory is always kept horizontal when the fork frame body inclines. The forklift mast realizes forking of goods with large distance from the central line of the forklift through the tilting mechanism and the lifting mechanism, has large forking range and strong flexibility, can also ensure that the goods placing surface of the goods placing accessory is always in a horizontal position in the tilting process of the forklift mast, prevents the goods from sliding off, and has strong safety.

Description

Forklift and portal frame thereof

Technical Field

The utility model relates to a fork truck technical field specifically, relates to a fork truck and portal thereof.

Background

When a forklift in the prior art forks goods deviated from the center of the forklift, a left-right side shift mechanism is usually installed to realize left-right movement of a fork goods shelf.

For example, the chinese patent application with application number CN201410687134.5 discloses a fork frame structure of a forklift and a reach truck, in which a fork frame and an inner mast of the forklift are connected by an inclined side shift mechanism that realizes four-way movement of the fork frame, and the inclined side shift mechanism can realize side shift movement of the fork frame in the left-right direction and inclined movement in the front-rear direction. However, the range of travel of the tilt side shift mechanism in the left-right direction is limited, and it is difficult to fork a load far from the center of the forklift.

Disclosure of Invention

The utility model aims at providing a fork truck and portal thereof, this fork is got the goods scope greatly, and work efficiency is high.

In order to achieve the above object, the present disclosure provides a forklift mast, comprising: the door frame body is used for being mounted on a forklift frame; a fork carriage slidably connected to the gantry body for mounting a cargo accessory; the fork frame is provided with a leveling mechanism which is used for adjusting the angle of the goods placing accessory so that the goods placing surface of the goods placing accessory is always kept horizontal when the fork frame body inclines.

Optionally, the tilting mechanism includes a main body, a first rotating shaft, and a first driving device, the front side of the main body is connected to the mast body, the first rotating shaft extends in the front-back direction and is connected between the rear side of the main body and the forklift frame, and the first driving device is configured to drive the main body to rotate around the first rotating shaft, so as to drive the mast body to tilt left and right.

Optionally, the first driving device comprises two first linear driving cylinders, one end of each first linear driving cylinder is hinged with the forklift frame, the other end of each first linear driving cylinder is hinged with the main body, and the two first linear driving cylinders are symmetrically arranged around the first rotating shaft.

Optionally, the tilting mechanism further includes a second rotating shaft extending in the left-right direction and connected between the main body and the gantry body, and a second driving device for driving the gantry body to rotate around the second rotating shaft, so as to drive the gantry body to tilt back and forth.

Optionally, a connecting portion is disposed on the gantry body, the second driving device includes a second linear driving cylinder, one end of the second linear driving cylinder is hinged to the connecting portion, and the other end of the second linear driving cylinder is hinged to the main body.

Optionally, the main body includes a connecting plate configured in an n-shaped structure in a front-rear direction, and two side plates extending forward from left and right sides of the connecting plate, the top surface of the connecting plate further has a first mounting plate extending rearward and a second mounting plate extending downward from a rear edge of the first mounting plate, the gantry body is sandwiched between the two side plates, each side plate is respectively formed with a first pivot hole, one end of the second rotating shaft rotatably penetrates through the first pivot hole, the other end of the second rotating shaft is fixed on the gantry body, the upper surface of the first mounting plate is formed with a mounting seat for mounting the second driving device, and the second mounting plate is used for mounting the first driving device.

Optionally, the fork comprises a fork body and a carriage slidably connected to the mast body, a third shaft extending in a forward-backward direction is connected between the fork body and the carriage, and the leveling mechanism comprises a third driving device for driving the fork body to rotate relative to the carriage about the third shaft.

Optionally, the carriage has a second pivot hole, one end of the third rotating shaft is fixed to the rear side of the fork carriage body, the other end of the third rotating shaft is pivotally mounted in the second pivot hole, a plurality of rocker arms are formed on the third rotating shaft and are arranged at intervals along the circumferential direction, the third driving device comprises a plurality of third linear driving cylinders, one end of each third linear driving cylinder is hinged to the rocker arm, and the other end of each third linear driving cylinder is hinged to the carriage.

Optionally, the slide has a plate-shaped body, on which two mounting pins are formed, symmetrically arranged about the second pivot hole, with which the third linear drive cylinder is articulated.

Optionally, the mast body comprises an outer mast and an inner mast slidably mounted on the outer mast, the fork carriage is slidably mounted on the inner mast, the lift mechanism comprises a fourth drive unit and a synchronous transmission mechanism, the fourth drive unit is arranged between the outer mast and the inner mast, the synchronous transmission mechanism is connected between the outer mast and the fork carriage, and the lift mechanism is configured such that when the fourth drive unit drives the inner mast to ascend or descend along the outer mast, the fork carriage is synchronously ascended or descended along the inner mast through the synchronous transmission mechanism.

Optionally, the mutually facing sides of the outer door frames are provided with outer door frame sliding grooves extending along the height direction, the inner door frames are correspondingly provided with first rollers matched with the outer door frame sliding grooves,

the sides of the inner door frames facing each other are provided with inner door frame sliding grooves extending along the height direction, the fork frame is provided with second rollers matched with the inner door frame sliding grooves,

the synchronous transmission mechanism comprises a pulley and a chain, a fixed seat is arranged on the outer gantry, a cross beam is arranged at the upper end of the inner gantry, the pulley is fixed on the cross beam, one end of the chain is fixedly connected with the fixed seat, and the other end of the chain passes through the pulley and the fork frame.

Another aspect of this disclosure still provides a fork truck, fork truck includes as above the fork truck portal, fork truck still includes fork truck frame, loading attachment, controller and with this controller difference signal connection's first sensor and second sensor, first sensor is used for detecting the angle of portal body for fork truck frame slope from left to right, the second sensor is used for detecting loading attachment for the turned angle of portal body, the controller with leveling mechanism signal connection.

Through above-mentioned technical scheme, according to the structure of above-mentioned fork truck portal, to a great extent has improved the working property of fork truck portal. Firstly, the forklift mast makes the mast body incline along the lateral direction or the front-back direction relative to the forklift frame through the inclining mechanism, so that the distance of the goods placing accessory deviating from the central line of the forklift in the lateral direction is not limited by the structure of the forklift, and the goods deviating from the central line of the forklift at a larger distance can be forked. Secondly, through the cooperation of elevating system and tilt mechanism, can realize the left and right sides slope of portal body, tilt around and put multiple motion modes such as reciprocating of goods accessory, the goods of different positions can be got to the mutually supporting of these motion modes, and the fork is got the scope and is got the scope greatly, and the flexibility is strong, consequently can improve fork truck's work efficiency. Finally, in the process that the forklift gantry is inclined, the goods placing surface of the goods placing accessory is always kept in a horizontal position through the leveling mechanism, so that the forklift gantry is convenient to fork into the bottom of the goods, the goods can be prevented from sliding, and the safety is high.

Additional features and advantages of the disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:

FIG. 1 is a side view of the structure of an exemplary embodiment of a forklift mast according to the present disclosure;

FIG. 2 is a schematic diagram of the structure of an exemplary embodiment of the forklift mast of the present disclosure illustrating a state of tilting the mast body and the lift forks to fork the load;

FIG. 3 is a schematic diagram of the structure of an exemplary embodiment of the forklift mast of the present disclosure, illustrating the condition of tilting the mast body backwards;

FIG. 4 is a schematic structural view of an exemplary embodiment of a tilting mechanism according to the present disclosure;

FIG. 5 is a schematic structural view of a gantry body and lift mechanism of an exemplary embodiment of the present disclosure;

FIG. 6 is a schematic illustration of the structure of a fork and a loading accessory of an exemplary embodiment of the present disclosure;

FIG. 7 is a schematic structural view of a cylinder according to an exemplary embodiment of the present disclosure;

fig. 8 is a schematic structural view of an exemplary embodiment of a forklift frame according to the present disclosure.

Description of the reference numerals

1 gantry body 11 second rotating shaft 12 connecting part

13 outer gantry 14 and inner gantry 15 first roller

16 fixed seat 17 cross beam 18 pulley

19-chain 2-fork 21-fork body

22 third shaft 221 rocker 23 slide

231 second pivot hole 232 third driving device for plate-shaped main body 24

25 mounting pin 26 second roller 27 catch rack

28 hanging part 281 clamping teeth 3 goods placing accessory

Fourth driving device of 31 goods-placing surface 4 lifting mechanism 41

5 tilting mechanism 51 Main body 511 connecting plate

512 side plate 513 first mounting plate 514 second mounting plate

515 first pivot hole 516 mounting seat 517 fixed block

52 first shaft 53 first drive 54 second drive

6 oil cylinder 61 first oil filling port 62 second oil filling port

7 forklift truck frame 71 frame body 72 base

73 fixed plate 8 first sensor 9 second sensor

Detailed Description

The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.

In the present disclosure, unless otherwise specified, the use of directional words such as "front and rear" generally means forward toward the vehicle head and rearward toward the vehicle tail; "left and right" are directions shown in the drawing, where the direction on the left side of the forklift is left, the direction on the right side of the forklift is right, when the front of the forklift is taken as a reference; the upper and lower are defined by the conventional placement direction or position relation of the forklift mast, and can be understood as the upper and lower along the gravity direction; "inside and outside" means that the side facing the center line of the vehicle body is inside and the side away from the center line of the vehicle body is outside. The foregoing directional terms are used only to explain and illustrate the present disclosure, and are not to be construed as limiting the present disclosure. Furthermore, terms such as "first," "second," and the like, are used herein to distinguish one element from another, and are not necessarily sequential or significant. In addition, in the description with reference to the drawings, the same reference numerals in different drawings denote the same elements.

In the related art, the inventors of the present application found that the reason why the stroke range of the left and right side shift mechanism is limited is that the side shift mechanism can only move left and right within the width range of the forklift or the mast thereof, thus greatly limiting the range of forking goods.

Accordingly, the disclosed embodiments provide a forklift mast, as shown in fig. 1-3, comprising: the door frame comprises a door frame body 1, wherein the door frame body 1 is used for being installed on a forklift frame 7; a fork frame 2, wherein the fork frame 2 is connected to the portal body 1 in a sliding manner and is used for mounting a cargo accessory 3; an elevating mechanism 4 for driving the fork frame 2 to ascend and descend on the mast body 1, and a tilting mechanism 5 for driving the mast body 1 to tilt with respect to the forklift frame 7, wherein the fork frame 2 has a leveling mechanism for adjusting an angle of the loading accessory 3 so that the loading surface 31 of the loading accessory 3 is always kept horizontal when the mast body 1 is tilted.

Through above-mentioned technical scheme, when the fork gets and lift off the goods at skew fork truck center, the main work flow of above-mentioned fork truck portal is as follows:

firstly, the lifting mechanism 4 and the tilting mechanism 5 are controlled to enable the lifting mechanism 4 to drive the fork frame 2 provided with the goods placing accessory 3 to ascend and descend along the portal body 1, and the tilting mechanism 5 drives the portal body 1 to tilt relative to the forklift frame 7 towards the direction of the goods until the position is adjusted to a proper position capable of forking the goods; wherein, while inclining the portal frame body 1, the leveling mechanism on the fork frame 2 adjusts the goods placing accessory 3 to make the goods placing surface 31 keep level all the time;

then, the forklift is driven forwards to enable the goods placing accessory 3 to be forked to the bottom of the goods, and the lifting mechanism 4 is started to enable the goods placing accessory 3 to be lifted upwards slightly so as to enable the goods to be taken out smoothly;

finally, the forklift is driven to retreat to a proper distance, the lifting mechanism 4 is started, the fork frame 2 drives the goods placing accessory 3 to descend to a required height, for example, when the goods need to be unloaded manually, the fork frame 2 can descend to a position 300mm away from the ground, and then the goods can be forked and unloaded.

It should be noted that the above-mentioned work flow is only an exemplary flow for the forklift to fork the goods, and does not mean that the forklift mast of the present disclosure can only operate according to the above-mentioned process. For example, after the cargo holder 3 is forked to the bottom of the cargo, the tilting mechanism 5 may be activated first to make the cargo abut backwards, and then the lifting mechanism 4 is activated to lift the cargo upwards, where a person skilled in the art may operate flexibly according to experience, and the present disclosure does not limit the sequence of the above operation processes.

According to the above-described structure of the forklift mast and its operation, as shown in fig. 2, it can be used to fork the goods offset from the center of the forklift by a distance a, which can be obtained according to the calculation formula a ═ h × tan β, where h is the vertical distance from the center of the fork 2 to the center of the tilting mechanism 5, and β is the angle between the center line and the vertical line when the mast body 1 is tilted sideways.

It can be seen that the distance a is mainly related to two factors, namely the lifting height of the fork frame 2 and the inclination angle of the gantry body 1, different forking positions can be reached by adjusting the lifting height and the inclination angle, the flexibility is high, and the forking range can be improved.

According to the structure of the forklift mast and the working process thereof, the working performance of the forklift mast is improved to a great extent, firstly, the forklift mast enables the mast body 1 to incline along the side direction or along the front and back direction relative to the forklift frame 7 through the inclining mechanism 5, so that the distance of the goods placing accessory 3 deviating the central line of the forklift in the side direction is not limited by the structure of the forklift, and the goods deviating the central line of the forklift and having a larger distance are forked. Secondly, through the cooperation of elevating system 4 and tilt mechanism 5, can realize the left and right sides slope of portal body 1, tilt around, and put multiple motion modes such as the reciprocating of attachment 3, the cooperation of these motion modes can fork the goods of different positions, and the fork is got the scope and is got the scope greatly, and the flexibility is strong, consequently can improve fork truck's work efficiency. Finally, in the process that the forklift gantry is inclined, the goods placing surface 31 of the goods placing accessory 3 is always kept in a horizontal position through the leveling mechanism, so that the forklift gantry is convenient to be inserted into the bottom of goods, the goods can be prevented from sliding, and the safety is high.

The storage accessory 3 in the embodiment of the present disclosure may be a fork rack as shown in fig. 1 to 3, or may be other types of storage accessories such as a paper roll clip, a carton clip, a rotator, and the like, which is not limited by the present disclosure. Here, when the loading accessories of the type such as the paper roll holder, the paper box holder, and the like are selected, since the paper roll holder, the paper box holder, and the like have a function of clamping the goods by themselves to prevent the goods from falling, the leveling mechanism in the above-described embodiment can be omitted, so that the entire forklift mast structure is made simpler.

The detailed structure of the forklift mast according to an exemplary embodiment of the present disclosure, which includes the mast body 1, the fork carriage 2, the lift mechanism 4 and the tilt mechanism 5 described above, will be described in detail with reference to fig. 1 to 8.

Specifically, as shown in fig. 4 and 5, the tilting mechanism 5 includes a main body 51, a first rotating shaft 52, and a first driving device 53, wherein the front side of the main body 51 is connected to the mast body 1, the first rotating shaft 52 extends in the front-rear direction and is connected between the rear side of the main body 51 and the forklift frame 7, and the first driving device 53 is configured to drive the main body 51 to rotate around the first rotating shaft 52, so as to tilt the mast body 1 left and right.

As an exemplary embodiment of the present disclosure, the first driving device 53 includes two first linear driving cylinders, one end of each of which is hinged to the forklift frame 7 and the other end of which is hinged to the main body 51, and the two first linear driving cylinders are symmetrically disposed about the first rotating shaft 52. The first linear driving cylinder may be an air cylinder, a hydraulic cylinder, or the like.

For example, the first drive means 53 may be the oil cylinder 6 including the first oil port 61 and the second oil port 62 as shown in fig. 7, the first oil port 61 communicating with the rod chamber, the second oil port 62 communicating with the rodless chamber, the piston rod of the oil cylinder 6 retracting inward of the cylinder when the first oil port 61 is filled with oil, the piston rod of the oil cylinder 6 extending outward of the cylinder when the second oil port 62 is filled with oil, and the oil cylinder 6 being in the lock state when the oil injection is stopped.

Therefore, when the oil cylinder 6 is used as an embodiment of the first driving device 53, since the first driving devices 53 are symmetrically disposed on both left and right sides of the first rotating shaft 52, when the second oil injection port 62 of the left first driving device 53 is filled with oil and the first oil injection port 61 of the right first driving device 53 is filled with oil, the left first driving device 53 is extended and the right first driving device 53 is shortened, so that the gantry body 1 is driven to tilt to the right. Otherwise, the gantry body 1 tilts to the left. When the oiling is stopped, the oil cylinder 6 is in a locking state, and the gantry body 1 is kept still at the current position.

Alternatively, in other embodiments of the present disclosure, the first driving device 53, and the second driving device 54, the third driving device 24, and the fourth driving device 41 which will be mentioned below may also be a combination of driving members and transmission members such as a motor, a gear, a rack, and the like, and the present disclosure is not limited thereto.

Further, the tilting mechanism 5 further includes a second rotating shaft 11 and a second driving device 54, the second rotating shaft 11 extends along the left-right direction and is connected between the main body 51 and the gantry body 1, and the second driving device 54 is configured to drive the gantry body 1 to rotate around the second rotating shaft 11, so as to drive the gantry body 1 to tilt back and forth.

Wherein, the connecting portion 12 is disposed on the gantry body 1, and the second driving device 54 includes a second linear driving cylinder, one end of which is hinged to the connecting portion 12, and the other end is hinged to the main body 51. Wherein, the second linear driving cylinder can be a pneumatic cylinder or a hydraulic cylinder, etc.

In order to achieve the fore-and-aft tilting of the mast, the connecting portion 12 on the mast body 1 may be slightly higher than the hinge joint where the second driving device 54 is hinged with the main body 51, with reference to the ground, so that the second driving device 54 extends obliquely upward from the main body 51 of the tilting mechanism 5 to the connecting portion 12 of the mast body 1. Thus, when the second driving device 54 extends, the second driving device 54 pushes the gantry body 1 to tilt forward about the second rotation axis 11. Conversely, when the second driving device 54 is simultaneously shortened, the second driving device 54 pushes the mast body 1 to tilt backwards about the second rotation axis 11.

It should be noted here that the second driving device 54 may be a plurality of second linear driving cylinders, for example, two as shown in fig. 4, which are disposed in parallel in the same direction between the mast body 1 and the main body 51, and during operation, the plurality of second driving devices 54 are simultaneously extended and shortened to ensure the stability of the front and rear inclinations.

As an exemplary embodiment of the present disclosure, as shown in fig. 4 and 5, the main body 51 includes a connection plate 511 and two side plates 512 configured in an n-shaped configuration in a front-rear direction, the two side plates 512 extend forward from left and right sides of the connection plate 511, a top surface of the connection plate 511 further has a first mounting plate 513 extending rearward and a second mounting plate 514 extending downward from a rear edge of the first mounting plate 513, the gantry body 1 is sandwiched between the two side plates 512, each side plate 512 is formed with a first pivot hole 515, one end of the second rotating shaft 11 is rotatably inserted into the first pivot hole 515, the other end is fixed on the gantry body 1, an upper surface of the first mounting plate 513 is formed with a mounting seat 516 for mounting the second driving device 54, and the second mounting plate 514 is used for mounting the first driving device 53.

In addition, fig. 8 exemplarily shows the structure of the forklift frame 7 for mounting the tilting mechanism 5, the forklift frame 7 includes a frame body 71, a base 72 for mounting the first driving device 53, and a fixing plate 73, the fixing plate 73 is detachably fixed above the frame body 71 by a fastener, and defines a shaft hole for mounting the first rotating shaft 52 together with the frame body 71, and the other degrees of freedom of the first rotating shaft 52 except for rotation can be limited by the detachable fixing plate 73 and the frame body 71, so that the main body 51 of the tilting mechanism 5 can only rotate around the first rotating shaft 52 under the action of the first driving device 53 to realize the left-right tilting of the mast body 1.

As shown in fig. 4 and 8, the first driving device 53 is hinged between the second mounting plate 514 and the connecting plate 511 at one end and hinged to the base 72 of the forklift frame 7 at the other end, for example, by a pin or the like. During the tilting process, the forklift frame 7 is always kept still, and the left and right first driving devices 53 drive the main body 51 to tilt left and right, thereby driving the portal body 1 clamped between the two side plates 512 to tilt left and right.

In addition, in order to enable the tilting mechanism 5 to drive the gantry body 1 to tilt back and forth, as shown in fig. 4, fixing blocks 517 are detachably disposed above the two side plates 512 respectively, and the side plates 512 and the fixing blocks 517 define the first pivot hole 515 so as to limit the other degrees of freedom of the second rotating shaft 11 except for rotation, so that the gantry body 1 can only rotate around the second rotating shaft 11 under the action of the second driving device 54, and the back and forth tilting of the gantry body 1 is achieved.

The front-back and left-right tilting of the mast body 1 can be realized by the above-mentioned tilting mechanism 5, and the specific structure of the fork 2 will be described with reference to fig. 2, 5 and 6.

As an exemplary embodiment of the present disclosure, the fork 2 includes a fork body 21 and a carriage 23, the carriage 23 is slidably connected to the gantry body 1, a third rotating shaft 22 is connected between the fork body 21 and the carriage 23, the third rotating shaft 22 extends in a front-rear direction, and the leveling mechanism includes a third driving device 24, and the third driving device 24 is used for driving the fork body 21 to rotate relative to the carriage 23 around the third rotating shaft 22. When the portal body 1 inclines in the lateral direction, the fork frame body 21 rotates relative to the slide seat 23, so that the fork frame body 21 does not incline relative to the ground, thereby ensuring that the goods placing surface 31 of the goods placing accessory 3 on the fork frame 2 is always kept in a horizontal position.

The carriage 23 of the fork carriage 2 further has a second pivot hole 231, one end of a third shaft 22 is fixed to the rear side of the fork carriage body 21, the other end is pivotally mounted in the second pivot hole 231, the third shaft 22 is formed with a plurality of swing arms 221 arranged at intervals in the circumferential direction, and the third driving device 24 includes a plurality of third linear driving cylinders, each of which has one end hinged to the swing arm 221 and the other end hinged to the carriage 23.

The third driving device 24 may be a linear driving cylinder such as an air cylinder, a hydraulic cylinder, etc., for example, the oil cylinder 6 shown in fig. 7, or may be other driving devices such as a motor and a transmission member, which is not limited in this disclosure.

The third driving devices 24 are arranged at intervals in a tangential direction of the third rotating shaft 22, and are configured to drive the third rotating shaft 22 to rotate relative to the carriage 23 when the plurality of third driving devices 24 are simultaneously extended or retracted.

Further, the slider 23 has a plate-shaped body 232, and two mounting pins 25 symmetrically arranged about the second pivot hole 231 are formed on the plate-shaped body 232, and the third linear driving cylinder is hinged to the mounting pins 25. Accordingly, two swing arms 221 and two third linear driving cylinders are symmetrically disposed at the periphery of the third rotating shaft 22, so that the third rotating shaft 22 rotates by the couple of forces applied by the two third linear driving cylinders.

According to the structure, when the portal frame body 1 inclines laterally, the leveling mechanism can enable the goods placing surface 31 of the goods placing accessory 3 to be kept in a horizontal position so as to fork the goods placing surface 31 to the bottom of the goods and lift the goods upwards, then, the portal frame body 1 can be inclined towards the rear of the forklift through the inclining mechanism 5, the goods placing accessory 3 also inclines backwards along with the portal frame body 1, at the moment, the goods placing surface 31 of the goods placing accessory 3 is in a state that the front part is high and the rear part is low, therefore, the goods placed above the goods placing surface 31 can slide backwards to abut against the fork frame 2 of the goods placing accessory 3, and the stability and the safety of the goods in the loading and unloading process are improved.

Here, the fork 2 may further include a shelf 27 fixedly connected to the fork body 21 for supporting goods when the mast body 1 is tilted backward, and a hanger 28 for hanging the accessory 3 having a plurality of fastening teeth 281 on which the accessory 3 may be fastened by a fastening bolt.

Since the leveling mechanism levels the cargo fixture 3 only when the mast body 1 is tilted sideways, it is possible to save labor not only for the cargo to be pushed backward when the mast body 1 is tilted backward but also for the cargo to be slid forward and unloaded when the mast body 1 is tilted forward.

The leveling mechanism is only a preferred embodiment of the present disclosure, and in other alternative embodiments of the present disclosure, the leveling mechanism may also level when the gantry body 1 tilts back and forth, which is not limited by the present disclosure.

In connection with the above described structure of the forklift mast, the structure of the lifting mechanism 4 will be explained below with reference to fig. 2 and 5.

Specifically, the gantry body 1 comprises an outer gantry 13 and an inner gantry 14 slidably mounted on the outer gantry 13, the fork carriage 2 is slidably mounted on the inner gantry 14, the lifting mechanism 4 comprises a fourth driving device 41 and a synchronous transmission mechanism, the fourth driving device 41 is arranged between the outer gantry 13 and the inner gantry 14, the synchronous transmission mechanism is connected between the outer gantry 13 and the fork carriage 2, and the lifting mechanism 4 is configured such that when the fourth driving device 41 drives the inner gantry 14 to ascend or descend along the outer gantry 13, the fork carriage 2 ascends or descends along the inner gantry 14 synchronously through the synchronous transmission mechanism.

Through the cooperation of the inner door frame 14 and the outer door frame 13 which can be lifted and descended, when the inner door frame 14 rises and extends out of the outer door frame 13, the height range of forking goods can be improved, and when the inner door frame 14 descends and is folded inside the outer door frame 13, the space occupied by the forklift can be saved. Moreover, the lifting of the fork frame 2 is driven by the lifting of the inner gantry 14, namely, the lifting of the inner gantry 14 and the lifting of the fork frame 2 can be simultaneously driven by one driving device, thereby simplifying the structure.

As an exemplary embodiment of the present disclosure, the facing sides of the outer gantry 13 are provided with outer gantry sliding grooves extending in the height direction, and the inner gantry 14 is correspondingly provided with first rollers 15 engaged with the outer gantry sliding grooves. The first roller 15 can reduce the friction resistance between the inner gantry 14 and the outer gantry 13, reduce the driving load of the fourth driving device 41, and ensure the smoothness of the sliding of the inner gantry 14 in the chute of the outer gantry.

The mutually facing sides of the inner mast 14 are provided with inner mast runners extending in the height direction, and the fork carriage 2 is provided with second rollers 26 cooperating with the inner mast runners. Wherein the second roller 26 can be connected with the carriage 23 of the fork 2. Likewise, the second roller 26 reduces the frictional resistance between the inner and

outer frames

14, 13, ensuring the smoothness of the carriage 2 sliding in the outer frame runner.

As an exemplary embodiment, the synchronous transmission mechanism comprises a pulley 18 and a chain 19, the outer gantry 13 is provided with a fixed seat 16, the upper end of the inner gantry 14 is provided with a beam 17, the beam 17 is fixed with the pulley 18, one end of the chain 19 is fixedly connected with the fixed seat 16, and the other end is fixedly connected with the fork 2 through the pulley 18. When the inner gantry 14 is lifted relative to the outer gantry 13, one end of the chain 19 is fixed on the fixed seat 16 of the outer gantry 13 and remains stationary, and the beam 17 drives the pulley 18 to move upwards, so that the other end of the chain 19 pulls the fork frame 2 to slide upwards along the inner gantry 14, thereby lifting the fork frame 2.

Optionally, in other embodiments of the present disclosure, the synchronous transmission mechanism may also be a transmission mechanism such as a gear or a synchronous belt, which is not limited by the present disclosure.

Another aspect of the present disclosure also provides a forklift including the above forklift mast, the forklift further includes a forklift frame 7, a loading accessory 3, a controller, and a first sensor 8 and a second sensor 9 respectively in signal connection with the controller, the first sensor 8 is used for detecting an angle of left and right inclination of the mast body 1 relative to the forklift frame 7, for example, may be installed on the first rotating shaft 52, the second sensor 9 is used for detecting a rotation angle of the loading accessory 3 relative to the mast body 1, for example, may be installed on the third rotating shaft 22, and the controller is in signal connection with the leveling mechanism.

Since the goods can be abutted against the goods shelf 27 when the mast body 1 is tilted backwards, and the goods placing surface 31 is kept horizontal when the fork carriage 2 is lifted, the risk of dropping the goods is low in the two cases, therefore, the lifting mechanism 4 and the tilting mechanism 5 of the forklift mast of the present disclosure can be connected with the cab through a transmission mechanism, and the lifting of the fork carriage 2 and the tilting of the mast body 1 are manually controlled through a control handle of the cab.

The leveling mechanism of the fork frame 2 can be automatically controlled by a controller, the first sensor 8 detects the inclination angle of the portal frame body 1, the controller controls the third driving device 24 to start based on the inclination angle, and the loading accessory 3 is controlled to rotate reversely relative to the inclination direction in real time and always keep a horizontal state, namely, the reverse rotation angle of the loading accessory 3 detected by the second sensor 9 is consistent with the angle detected by the first sensor 8, so that the loading surface 31 of the loading accessory 3 is kept horizontal relative to the ground at any time.

Alternatively, in other embodiments of the present disclosure, the lifting mechanism 4, the tilting mechanism 5 and the leveling mechanism may be automatically controlled by the controller, which is not limited by the present disclosure.

The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, various possible combinations will not be separately described in this disclosure.

In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims

1. A forklift mast, comprising:

the door frame comprises a door frame body (1), wherein the door frame body (1) is used for being mounted on a forklift frame (7);

a fork frame (2), wherein the fork frame (2) is connected to the portal body (1) in a sliding manner and is used for mounting a cargo accessory (3);

a lifting mechanism (4), the lifting mechanism (4) is used for driving the fork frame (2) to lift on the portal body (1), and

a tilting mechanism (5), the tilting mechanism (5) is used for driving the gantry body (1) to tilt relative to the forklift frame (7),

wherein the fork frame (2) is provided with a leveling mechanism which is used for adjusting the angle of the goods placing accessory (3) so that the goods placing surface (31) of the goods placing accessory (3) is always kept horizontal when the portal frame body (1) inclines,

the fork (2) comprises a fork body (21) and a sliding seat (23), the sliding seat (23) is connected on the portal body (1) in a sliding mode, a third rotating shaft (22) is connected between the fork body (21) and the sliding seat (23), the third rotating shaft (22) extends in the front-back direction, the leveling mechanism comprises a third driving device (24), and the third driving device (24) is used for driving the fork body (21) to rotate around the third rotating shaft (22) relative to the sliding seat (23);

the sliding seat (23) is provided with a second pivot hole (231), one end of the third rotating shaft (22) is fixed at the rear side of the fork frame body (21), the other end of the third rotating shaft is pivotally installed in the second pivot hole (231), two rocker arms (221) symmetrically arranged around the periphery of the third rotating shaft (22) are formed on the third rotating shaft (22), the third driving device (24) comprises two third linear driving cylinders, one end of each third linear driving cylinder is hinged with the corresponding rocker arm (221), and the other end of each third linear driving cylinder is hinged with the sliding seat (23);

the sliding base (23) is provided with a plate-shaped main body (232), two mounting pins (25) which are symmetrically arranged relative to the second pivot hole (231) are formed on the plate-shaped main body (232), and the third linear driving cylinder is hinged with the mounting pins (25).

2. Mast for a forklift truck according to claim 1, characterised in that said tilting mechanism (5) comprises a main body (51), a first rotation shaft (52), first driving means (53), said main body (51) being connected at a front side to said mast body (1), said first rotation shaft (52) extending in a front-rear direction and being connected between a rear side of said main body (51) and said forklift truck frame (7), said first driving means (53) being adapted to drive said main body (51) in rotation about said first rotation shaft (52) so as to bring about a side-to-side tilting of said mast body (1).

3. The forklift mast as claimed in claim 2, characterised in that said first driving means (53) comprise two first linear-drive cylinders, each of which is articulated at one end to the forklift frame (7) and at the other end to the main body (51), and which are arranged symmetrically with respect to the first rotation axis (52).

4. The forklift mast as claimed in claim 2, wherein said tilting mechanism (5) further comprises a second rotating shaft (11) and a second driving device (54), said second rotating shaft (11) extending in a left-right direction and being connected between said main body (51) and said mast body (1), said second driving device (54) being adapted to drive said mast body (1) to rotate about said second rotating shaft (11) so as to tilt said mast body (1) back and forth.

5. Mast for a forklift truck according to claim 4, characterized in that said mast body (1) is provided with a connecting portion (12) and said second driving means (54) comprise a second linear actuating cylinder hinged at one end to said connecting portion (12) and at the other end to said main body (51).

6. The forklift mast as claimed in claim 4, wherein the main body (51) comprises a connecting plate (511) and two side plates (512) configured into an n-shaped structure in the front-rear direction, the two side plates (512) extend forward from the left and right sides of the connecting plate (511), the top surface of the connecting plate (511) further has a first mounting plate (513) extending rearward and a second mounting plate (514) extending downward from the rear edge of the first mounting plate (513), the mast body (1) is sandwiched between the two side plates (512), each side plate (512) is formed with a first pivot hole (515), the second rotary shaft (11) is rotatably inserted into the first pivot hole (515) at one end and fixed to the mast body (1) at the other end, the upper surface of the first mounting plate (513) is formed with a mounting seat (516) for mounting the second driving device (54), the second mounting plate (514) is used for mounting the first driving device (53).

7. Mast for a forklift truck according to claim 1, characterised in that said mast body (1) comprises an outer mast (13) and an inner mast (14) slidably mounted on the outer mast (13), the fork frame (2) is slidably mounted on the inner gantry (14), the lifting mechanism (4) comprises a fourth drive (41) and a synchronous transmission mechanism, the fourth driving device (41) is arranged between the outer gantry (13) and the inner gantry (14), the synchronous transmission mechanism is connected between the outer gantry (13) and the fork frame (2), the lifting mechanism (4) is configured that when the fourth driving device (41) drives the inner gantry (14) to ascend or descend along the outer gantry (13), the fork frame (2) is synchronously lifted or lowered along the inner door frame (14) through the synchronous transmission mechanism.

8. The forklift mast as claimed in claim 7, characterised in that the mutually facing sides of the outer mast (13) are provided with outer mast runners extending in the height direction, the inner mast (14) being correspondingly provided with first rollers (15) cooperating with the outer mast runners,

the sides of the inner door frames (14) facing each other are provided with inner door frame sliding grooves extending along the height direction, the fork frame (2) is provided with second rollers (26) matched with the inner door frame sliding grooves,

the synchronous transmission mechanism comprises a pulley (18) and a chain (19), a fixed seat (16) is arranged on the outer door frame (13), a cross beam (17) is arranged at the upper end of the inner door frame (14), the pulley (18) is fixed on the cross beam (17), one end of the chain (19) is fixedly connected with the fixed seat (16), and the other end of the chain passes through the pulley (18) and the fork frame (2) is fixedly connected.

9. A forklift truck, characterized in that the forklift truck comprises the forklift truck mast according to any one of claims 1 to 8, the forklift truck further comprises a forklift truck frame (7), a loading attachment (3), a controller, and a first sensor (8) and a second sensor (9) respectively in signal connection with the controller, the first sensor (8) is used for detecting the angle of left-right inclination of the mast body (1) relative to the forklift truck frame (7), the second sensor (9) is used for detecting the rotation angle of the loading attachment (3) relative to the mast body (1), and the controller is in signal connection with the leveling mechanism.