CN111017815B

CN111017815B - Lifting device for forklift

Info

Publication number: CN111017815B
Application number: CN201911319423.9A
Authority: CN
Inventors: 程伟
Original assignee: Maanshan Numen Intellectual Property Management Services Co Ltd
Current assignee: Maanshan Numen Intellectual Property Management Services Co Ltd
Priority date: 2019-12-19
Filing date: 2019-12-19
Publication date: 2021-02-26
Anticipated expiration: 2039-12-19
Also published as: CN111017815A

Abstract

The invention provides a lifting device for a forklift, which comprises a fork frame for fixing a fork, a portal frame for the fork frame to move up and down, an inclined oil cylinder for adjusting the inclination angle of the portal frame and a fixed rod hinged at the lower end of the portal frame and used for fixing the portal frame on the forklift, wherein a lifting oil cylinder for lifting the fork frame is arranged in the portal frame, a gear is rotatably fixed at the top end of the lifting oil cylinder, a chain is wound on the gear, one end of the chain is fixed with the fork frame, the other end of the chain is fixed with the fixed plate at the rear side of the portal frame, a rolling device is arranged on the fork frame and can roll in an inner rail of the portal frame, and side plates are. The invention can reduce the influence of vibration.

Description

Lifting device for forklift

Technical Field

The invention belongs to the field of freight devices, and particularly relates to a lifting device for a forklift.

Background

Referring to fig. 1 to 3, the forklift 100 of the prior art includes a lifting device 200, the lifting device 200 includes a fork frame 2 for fixing a fork 1, a mast 3 for moving the fork frame 2 up and down, a tilt cylinder 4 for adjusting an inclination angle of the mast 3, and a fixing rod 5 hinged to a lower end of the mast 3 for fixing the mast 3 to the forklift 100, a roller 6 is fixed to the fork frame 2, a lift cylinder 7 for lifting the fork frame 2 is provided in the mast 3, a gear 8 is rotatably fixed to a top end of the lift cylinder 7, a chain 9 is wound around the gear 8, one end of the chain 9 is fixed to the fork frame 2, the other end is fixed to a fixing plate at a rear side of the mast 3, and the roller 6 can roll in a mast inner rail 10 of the mast 3.

In the prior art, when a forklift drives or forks goods, the lifting device shakes/vibrates in the lifting or descending process, so that the stability of the goods on the forklift is seriously influenced, and the lifting device is easy to break down due to the shaking/vibrating.

Disclosure of Invention

In view of the above technical problem, the present invention provides a lifting device for a forklift.

In order to solve the technical problems, the technical scheme of the invention is as follows:

a lifting device 200 for a forklift 100 is provided, wherein the lifting device 200 comprises a fork frame 2 for fixing a fork 1, a portal frame 3 for enabling the fork frame 2 to move up and down, an inclined oil cylinder 4 for adjusting the inclination angle of the portal frame 3 and a fixing rod 5 hinged to the lower end of the portal frame 3 and used for fixing the portal frame 3 on the forklift 100, a lifting oil cylinder 7 for lifting the fork frame 2 is arranged in the portal frame 3, a gear 8 is rotatably fixed at the top end of the lifting oil cylinder 7, a chain 9 is wound on the gear 8, one end of the chain 9 is fixed with the fork frame 2, the other end of the chain is fixed with the fixing plate at the rear side of the portal frame 3, a rolling device 13 is arranged on the fork frame 2, the rolling device 13 can roll in a portal frame inner rail 10 of the portal frame 3, and side plates 11 are arranged on two.

Furthermore, two groups of through holes 12 are respectively arranged above and below the side plates 11, each group of through holes 12 is 4, the left side plate 11 and the right side plate 11 are oppositely arranged 2, two groups of rolling devices 13 are arranged on the fork frame 2 up and down, and the abutting of the rolling devices 13 and the side plates 11 can be adjusted through the through holes 12.

Further, the rolling device 13 includes a supporting block 14, the supporting block 14 is square, four corners of the supporting block 14 are hinged to one end of a first supporting rod 15, the other end of the first supporting rod 15 is hinged to a supporting wheel 16, the supporting wheel 16 on the left side of the supporting block 14 abuts against the left side plate 11, the supporting wheel 16 on the right side of the supporting block 14 abuts against the right side plate 11, fixed shafts 25 are fixed to the left and right sides of the supporting block 14, rotating sleeves 21 are rotatably fixed to the fixed shafts 25, first sleeves 20 and second sleeves 24 are rotatably sleeved on the rotating sleeves 21, the second sleeves 24 are located between the first sleeves 20 and the supporting block 14, second hinge seats 19 are fixed to the upper and lower sides of the first sleeves 20, the second hinge seats 19 are hinged to a second supporting rod 17, the second supporting rod 17 is hinged to a first hinge seat 18 fixed to the first supporting rod 15, the rotating sleeve 21 is provided with an external thread, the first sleeve 20 and the second sleeve 24 are provided with an internal thread matched with the external thread for transmission, the end part of the rotating sleeve 21 is a hexagonal head 23, the outer end part of the fixing shaft 25 is provided with a first limiting end 26, the fixing part of the fixing shaft 25 and the supporting block 14 is provided with a second limiting end 27, and the first limiting end 26 and the second limiting end 27 limit the rotating sleeve 21 on the fixing shaft 25 in a rotatable manner.

Further, the support block 14 is fixed to a connecting shaft 28, the connecting shaft 28 is connected to a fixing block 29, and the fixing block 29 is fixed to the fork carriage 2.

Further, the width of the support wheel 16 is larger than the diameter of the through hole 12.

Compared with the prior art, the invention has the following beneficial effects: the rolling device is arranged, so that the problem that the gap between the roller and the portal is not adjustable in the prior art is solved, the vibration influence caused by the unadjustable gap can be reduced, and meanwhile, the rolling device can be applied to forklifts with various portal widths.

Drawings

FIG. 1 is a schematic diagram of a prior art forklift of the present invention;

FIG. 2 is a schematic diagram of a prior art lifting device according to the present invention;

FIG. 3 is a schematic view of the internal structure of a prior art lifting device according to the present invention;

FIG. 4 is a schematic view of a connection structure between a roller and a gantry of a lifting device according to the prior art;

FIG. 5 is a first schematic view of a connection structure of a rolling device and a gantry of the lifting device of the present invention;

FIG. 6 is an enlarged schematic view of region A of FIG. 5 in accordance with the present invention;

FIG. 7 is an enlarged view of area B of FIG. 6 according to the present invention;

FIG. 8 is an enlarged view of area B of FIG. 6 according to the present invention;

FIG. 9 is an enlarged schematic view of region C of FIG. 5 in accordance with the present invention;

FIG. 10 is an enlarged schematic view of the invention taken in section D of FIG. 9;

FIG. 11 is a second schematic view of the connection structure of the rolling device and the gantry of the lifting device of the present invention;

FIG. 12 is a rear view of the lift of the present invention;

FIG. 13 is an enlarged schematic view of region E of FIG. 12 in accordance with the present invention;

FIG. 14 is a schematic view of the structure of FIG. 13 taken along line A-A;

in the figure, the forklift 100, the lifting device 200, the fork 1, the fork frame 2, the portal frame 3, the tilt cylinder 4, the fixing rod 5, the roller 6, the lift cylinder 7, the gear 8, the chain 9, the portal frame inner rail 10, the side plate 11, the through hole 12, the rolling device 13, the supporting block 14, the first supporting rod 15, the supporting wheel 16, the second supporting rod 17, the first hinged seat 18, the second hinged seat 19, the first sleeve 20, the rotating sleeve 21, the connecting part 22, the hexagonal head 23, the second sleeve 24, the fixing shaft 25, the first limiting end 26, the second limiting end 27, the connecting shaft 28 and the fixing block 29 are shown.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

The present invention discloses a lifting device 200 for a forklift 100, as shown in fig. 1 to 5, the lifting device 200 includes a fork carriage 2 for fixing a fork 1, a mast 3 for moving the fork carriage 2 up and down, an inclination cylinder 4 for adjusting an inclination angle of the mast 3, and a fixing lever 5 hinged to a lower end of the mast 3 for fixing the mast 3 to the forklift 100. As shown in fig. 3, a lift cylinder 7 for lifting the fork carriage 2 is arranged in the gantry 3, a gear 8 is rotatably fixed at the top end of the lift cylinder 7 according to the description in fig. 3, a chain 9 is wound on the gear 8, one end of the chain 9 is fixed with the fork carriage 2, the other end of the chain 9 is fixed with a fixed plate at the rear side of the gantry 3, a rolling device 13 is arranged on the fork carriage 2, the rolling device 13 can roll in a gantry inner rail 10 of the gantry 3, and side plates 11 are arranged on two sides of the gantry inner rail 10 on the gantry 3. It should be noted that the rolling device 13 of the present invention is completely different from the roller 6 of the prior art, and the rolling device 13 has a function of adjusting the gap between the rolling device and the door frame side plate 11. Also described in connection with fig. 12, in order to enable the fork carriage 2 to be stabilized during lifting and lowering, the present invention provides two gears 8 symmetrically arranged on the upper end of the lift cylinder 7 and two corresponding chains 9.

Fig. 5 shows the arrangement relationship of the gantry 3 and the rolling device 13 according to the present invention, which is a positional relationship diagram of the inside of the gantry 3. As can be seen from fig. 5, two sides of the portal inner rail 10 of a portal 3 are divided into a left side plate 11 and a right side plate 11, two sets of through holes 12 are respectively arranged at the upper position and the lower position of the side plates 11, each set of through holes 12 is 4, 2 are oppositely arranged on the left side plate 11 and the right side plate 11, two sets of rolling devices 13 are arranged above and below the fork carriage 2, the distance between the upper circle center and the lower circle center of each set of through holes 12 is the same as the distance between the upper rolling device 13 and the lower rolling device 13, the through holes 12 are arranged above and below so as to adjust the abutting between the rolling devices 13 and the side plates 11 through the through holes 12, the better abutting relationship between the rolling devices 13 and the side plates 11 can be found by two-time adjustment, the adjustment is not limited to two times in practical application, the adjustment can be carried out in the up and down process, and the influence of vibration caused by the movement of the, the rolling device 13 and the side plate 11 can be abutted tightly without adjusting every time in the adjusting process, a certain gap is required, and the vibration cannot be completely removed.

For the purpose of reducing the effect of vibrations, the present invention designs a rolling device 13 as shown in fig. 6. As shown in fig. 6 to 8, the rolling device 13 includes a supporting block 14, and the supporting block 14 has a square shape, as shown in fig. 6, the part of the rolling device 13 located at the left and right of the supporting block 14 is divided into two parts. Four corners of the supporting block 14 are respectively hinged with a first supporting rod 15, a free end of the first supporting rod 15 is hinged with a supporting wheel 16, the supporting wheel 16 on the left side of the supporting block 14 abuts against the left side plate 11, the supporting wheel 16 on the right side of the supporting block 14 abuts against the right side plate 11, the left side and the right side of the supporting block 14 are fixed with a fixed shaft 25, a rotating sleeve 21 is rotatably fixed on the fixed shaft 25, a first sleeve 20 and a second sleeve 24 are rotatably sleeved on the rotating sleeve 21, the second sleeve 24 is positioned between the first sleeve 20 and the supporting block 14, the upper side and the lower side of the first sleeve 20 are fixed with second hinge seats 19, the second hinge seats 19 are hinged with the second supporting rod 17, the second supporting rod 17 is hinged with a first hinge seat 18 fixed on the first supporting rod 15, the rotating sleeve 21 is provided with external threads, and the first sleeve 20 and the second sleeve 24 are provided with internal threads matched with the external threads for transmission, the end part of the rotating sleeve 21 is a hexagon head 23, the outer end part of the fixed shaft 25 is provided with a first limit end 26, the fixing part of the fixed shaft 25 and the supporting block 14 is provided with a second limit end 27, and the first limit end 26 and the second limit end 27 limit the rotating sleeve 21 on the fixed shaft 25 in a rotatable manner. This device still has other effects simultaneously, because fork truck reciprocates for a long time at the in-process of work, consequently gyro wheel 6 among the prior art can cause wearing and tearing to aggravate wearing and tearing, gyro wheel 6 is the vibrations that can't reduce wearing and tearing and produce that can not adjust, and the accessible is adjusted and is reduced the vibrations influence that wearing and tearing caused in this application.

The adjusting step of the present invention is such that the position of the fork carriage 2 is adjusted by the lift cylinder 7 so that the horizontal position of the rotary sleeve 21 is aligned with the through hole 12, and the hexagonal head 23 at the end of the rotary sleeve 21 is coupled by an external hexagonal socket wrench, and the wrench is rotated to rotate the rotary sleeve 21 on the fixed shaft 25, and the rotary sleeve 21 is only rotated on the fixed shaft 25 due to the first and second position-

limiting ends

26 and 27, and the first sleeve 20 is moved in the left and right directions as shown in fig. 6 along the rotary sleeve 21 and drives the first levers 15 at both sides of the rotary sleeve 21 to open or close by the cooperation of the internal and external threads while the rotary sleeve 21 is rotated, and the other methods are adjusted in the same way. When the position of the first supporting rod 15 is adjusted to a desired state, the position of the socket head wrench is kept fixed, the second sleeve 24 is adjusted to abut against the supporting block 14 as shown in fig. 10, the wrench can be manually adjusted or used, and the internal threads of the first sleeve 20 and the second sleeve 24 are the same. As shown in fig. 10, there is a second limit end 27 between the rotary sleeve 21 and the supporting block 14, and since the diameter of the second limit end 27 is smaller than the outer diameter of the rotary sleeve 21, there is a gap between the rotary sleeve 21 and the supporting block 14, and when the rotary sleeve 21 abuts against the supporting block 14, a part of the second limit end is located at the gap and does not engage with the external thread of the rotary sleeve 21, and another part is located on the rotary sleeve 21 and engages with the external thread. As shown in fig. 9, taking a part on the left side of the supporting block 14 as an example, when the locking rotation is performed, the rotating sleeve 21 is rotated to move the first sleeve 20 to the left; when the rotation is released, the rotating sleeve 21 is rotated to move the first sleeve 20 rightward. When the second sleeve 24 abuts against the supporting block 14, the rotating sleeve 21 can be locked, the operation mode is as follows, since the internal threads of the first sleeve 20 and the second sleeve 24 are the same, the socket wrench already keeps the position of the rotating sleeve 21, the second sleeve 24 is adjusted to abut against the supporting block 14, and the second sleeve 24 is continuously rotated, the threads of the second sleeve 24 abut against the external threads of the rotating sleeve 21, so that the rotation position of the rotating sleeve 21 is fixed. The relative fixing of the rotary sleeve 21 by the second sleeve 24 is a good way in the present invention, and is not suitable for fixing the rotary sleeve 21 in a completely fixed way, so as to prevent the breakage of the components caused by the excessive impact force.

As shown in fig. 12 to 14, means for fixing the rolling device 13 to the fork carriage 2 are provided, and specifically, the connection portion 22 of the support block 14 is fixed to a connection shaft 28, the connection shaft 28 is connected to a fixing block 29, and the fixing block 29 is fixed to the fork carriage 2. The connecting portion 22 is formed at a portion of the support block 14 and is located at a middle portion of the support block 14.

In order to reduce the vibrations caused by the movement of the rolling means 13 on the gantry 3, the width of the support wheels 16 according to the invention is greater than the diameter of the through-hole 12 (in the figures, the through-hole 12 is shown to be prominent and not actually large), and no vibrations are caused thereby when the support wheels 16 pass over the through-hole 12.

It should be noted that: in the description of the present invention, it is to be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "circumferential", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting the present invention. In the present invention, unless otherwise expressly specified or limited, the terms "disposed," "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected or detachably connected; may be a mechanical connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

Finally, it should be noted that: although the invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes, modifications, equivalents, and improvements may be made without departing from the spirit and scope of the invention.

Claims

1. A lifting device (200) for a forklift (100), characterized by: the lifting device (200) comprises a fork frame (2) used for fixing a fork (1), a portal frame (3) used for the fork frame (2) to move up and down, an inclined oil cylinder (4) used for adjusting the inclination angle of the portal frame (3) and a fixing rod (5) hinged to the lower end of the portal frame (3) and used for fixing the portal frame (3) on the forklift (100), a lifting oil cylinder (7) used for lifting the fork frame (2) is arranged in the portal frame (3), a gear (8) is rotatably fixed at the top end of the lifting oil cylinder (7), a chain (9) is wound on the gear (8), one end of the chain (9) is fixed with the fork frame (2), the other end of the chain is fixed with the fixing plate at the rear side of the portal frame (3), a rolling device (13) is arranged on the fork frame (2), and the rolling device (13) can roll in a portal frame inner rail (10) of, side plates (11) are arranged on two sides of a portal inner rail (10) on the portal (3);

two groups of through holes (12) are respectively arranged above and below the side plates (11), each group of through holes (12) is 4, the left side plate and the right side plate (11) are oppositely arranged with 2, two groups of rolling devices (13) are arranged above and below the fork frame (2), and the rolling devices (13) can be adjusted to be abutted against the side plates (11) through the through holes (12);

the rolling device (13) comprises a supporting block (14), the supporting block (14) is square, four corners of the supporting block (14) are hinged to one end of a first supporting rod (15), the other end of the first supporting rod (15) is hinged to a supporting wheel (16), the supporting wheel (16) on the left side of the supporting block (14) abuts against a left side plate (11), the supporting wheel (16) on the right side of the supporting block (14) abuts against a right side plate (11), fixed shafts (25) are fixed to the left side and the right side of the supporting block (14), a rotating sleeve (21) is rotatably fixed on each fixed shaft (25), a first sleeve (20) and a second sleeve (24) are rotatably sleeved on each rotating sleeve (21), each second sleeve (24) is located between the first sleeve (20) and the supporting block (14), and second hinged seats (19) are fixed to the upper side and the lower side of the first sleeve (20), the second hinging seat (19) is hinged to the second supporting rod (17), the second supporting rod (17) is hinged to a first hinging seat (18) fixed on the first supporting rod (15), an external thread is arranged on the rotating sleeve (21), internal threads matched with and driven by the external thread are arranged on the first sleeve (20) and the second sleeve (24), the end part of the rotating sleeve (21) is a hexagonal head (23), a first limiting end (26) is arranged at the outer end part of the fixing shaft (25), a second limiting end (27) is arranged at the fixing part of the fixing shaft (25) and the supporting block (14), and the rotating sleeve (21) is rotatably limited on the fixing shaft (25) by the first limiting end (26) and the second limiting end (27).

2. A lifting device (200) for a forklift (100) as claimed in claim 1, characterized in that: the connecting portion (22) on the supporting block (14) is fixed with a connecting shaft (28), the connecting shaft (28) is connected with a fixing block (29), and the fixing block (29) is fixed on the fork frame (2).

3. A lifting device (200) for a forklift (100) as claimed in claim 2, characterized in that: the width of the supporting wheel (16) is larger than the diameter of the through hole (12).