Loading wheel lifting apparatus applied to mobile pallet truck

Abstract

The present invention relates to the technical field of mobile pallet trucks, and specifically, to a loading wheel lifting apparatus applied to a mobile pallet truck. The apparatus comprises: a first loading wheel lifting mechanism and a second loading wheel lifting mechanism, the first loading wheel lifting mechanism and the second loading wheel lifting mechanism being symmetrically distributed on two sides of a fork frame and a vehicle body structure plate. The first loading wheel lifting mechanism comprises a first support. An oil cylinder is hingedly connected to one end of the first support, a connecting rod bottom plate is connected to the other end of the first support, a first connecting rod is hingedly connected to the other end of the oil cylinder, a second connecting rod is hingedly connected to the other end of the first connecting rod, and a third connecting rod is hingedly connected to the other end of the second connecting rod. According to the present invention, the overall space occupied by the mechanism is reduced while a lifting action of the loading wheel is completed, the arrangement mode is more free, and the direction of the occupied space can be changed by means of simple conversion, so that the effects of reducing the length of the machine body and saving the space in the machine body are achieved.

Description

A load-bearing wheel lifting device applied to a mobile pallet truck Technical Field

[0001] The present invention relates to the technical field of mobile pallet trucks, and specifically provides a load-bearing wheel lifting device applied to a mobile pallet truck. Background Art

[0002] When a mobile pallet truck is working, the center of gravity of the goods is located between the load-bearing wheels and the steering wheels. And an overhead connecting rod mechanism is often used to achieve the function of driving the front and rear sides of the forklift to lift and lower simultaneously with one power source to lift the goods. Generally, a mobile pallet truck is only suitable for goods using a three-character pallet. Because the load-bearing wheels need to remain in contact with the ground, it is not suitable for a four-character pallet. In order to be suitable for a four-character pallet, a technical solution that can be selected at this time is to add an additional set of wheels and lift the load-bearing wheels when inserting the fork, so as to eliminate interference. For this technical solution, a translating cam is often used in combination with a linear guide rail to drive the overhead connecting rod mechanism to move. At this time, it may generate a large eccentric load due to the non-collinear force application directions, or greatly increase the body length due to the limitations of the mechanism size. Summary of the Invention

[0003] The purpose of the present invention is to provide a load-bearing wheel lifting device applied to a mobile pallet truck to solve the problems proposed in the above background art, namely, in a small space, high stability is required, and the original mechanism does not interfere.

[0004] To achieve the above purpose, the present invention provides the following technical solution: A load-bearing wheel lifting device applied to a mobile pallet truck, including:

[0005] A forklift frame, the outer wall of the forklift frame is fixedly connected with a vehicle body structure plate;

[0006] A first load-bearing wheel lifting mechanism and a second load-bearing wheel lifting mechanism, the first load-bearing wheel lifting mechanism and the second load-bearing wheel lifting mechanism are symmetrically distributed on both sides of the forklift frame and the vehicle body structure plate;

[0007] The first load-bearing wheel lifting mechanism includes a first support, one end of the first support is hinged with an oil cylinder, the other end of the first support is connected with a connecting rod bottom plate, the other end of the oil cylinder is hinged with a first connecting rod, the other end of the first connecting rod is hinged with a second connecting rod, the other end of the second connecting rod is hinged with a third connecting rod, the other end of the third connecting rod is hinged with a second support, the inside of the third connecting rod is connected with a fourth connecting rod, the other end of the fourth connecting rod is hinged with a fifth connecting rod, and the other end of the fifth connecting rod is connected with a load-bearing wheel assembly.

[0008] Preferably, the first support and the second support are rigidly fixedly connected to the outer wall of the connecting rod bottom plate, and the connecting rod bottom plate is rigidly fixedly connected to the outer wall of the vehicle body structure plate.

[0009] Preferably, the first support is hingedly connected to the oil cylinder via a pin, the oil cylinder is hingedly connected to the first connecting rod via a pin, and the middle of the first connecting rod is hingedly connected to the second support via a pin.

[0010] Preferably, the two top ears of the third connecting rod are hingedly connected to the second connecting rod and the second support through a pin shaft, and the second connecting rod and the second support are hingedly connected through a pin shaft.

[0011] Preferably, a sliding groove is provided on the lower half of the third connecting rod, and the interior of the sliding groove forms a moving secondary link with the end moving body of the fourth connecting rod.

[0012] Preferably, the fourth connecting rod is connected to the outside of the fork frame through a hinge, and the external bracket of the road wheel assembly is rigidly fixedly connected to the end of the fork frame.

[0013] The first road wheel lifting mechanism and the second road wheel lifting mechanism have the same structure, and the fork frame is provided with two guide grooves adapted for the installation and movement of components of the first road wheel lifting mechanism and the second road wheel lifting mechanism.

[0014] Preferably, compared with the prior art, the beneficial effect of the present invention is that while the invention completes the road wheel lifting action, the overall space occupied by the mechanism is less, and the layout is more flexible, and the direction of the occupied space can be changed by simply converting it, thereby achieving the effect of reducing the length of the body and saving space inside the body.

[0015] The lifting movement is achieved by a planar connecting rod mechanism, which makes the structure more streamlined;

[0016] Based on the advantages of the connecting rod mechanism itself, it has strong structural stability;

[0017] The connecting rod mechanism is fixed on the frame as a whole, and the level of integration and modularization is higher;

[0018] By utilizing the change of the pressure angle of the connecting rod structure, the energy distribution is more reasonable;

[0019] Use mechanical self-locking to limit and bear the load, which is relatively safe and stable;

[0020] It takes up less space and its structural strength is comparable to existing solutions;

[0021] The mechanism layout is varied, and the space inside the machine can be allocated more freely. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] FIG1 is a schematic diagram of the overall structure of the first road wheel lifting mechanism of the present invention;

[0023] FIG2 is a schematic diagram of the overall structure of the present invention;

[0024] FIG3 is a schematic diagram of the explosion structure of the present invention;

[0025] FIG4 is a schematic diagram of the structure of the present invention in a horizontal limit position state;

[0026] FIG5 is a schematic diagram of the structure of the upper limit position state of the present invention.

[0027] In the figure: 201, fork frame; 202, vehicle body structure plate; 203, first road wheel lifting mechanism; 204, second road wheel lifting mechanism; 301, first support; 302, connecting rod base plate; 303, oil cylinder; 304, first connecting rod; 305, second support; 306, second connecting rod; 307, third connecting rod; 308, fourth connecting rod; 309, fifth connecting rod; 310, road wheel assembly. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] Referring to Figures 1-5, an embodiment of the present invention provides a road wheel lifting device for a mobile pallet truck, comprising: the oil cylinder 303 and road wheel assembly 310 used in this application are both products that can be directly purchased on the market. The principles and connection methods thereof are well known to those skilled in the art, and therefore will not be described in detail here.

[0030] A fork frame 201, the outer wall of which is fixedly connected to a vehicle body structural plate 202;

[0031] A first road wheel lifting mechanism 203 and a second road wheel lifting mechanism 204 are symmetrically distributed on both sides of the fork frame 201 and the vehicle body structure plate 202;

[0032] The first road wheel lifting mechanism 203 includes a first support 301, one end of the first support 301 is hinged to an oil cylinder 303, the other end of the first support 301 is connected to a connecting rod base plate 302, the other end of the oil cylinder 303 is hinged to a first connecting rod 304, the other end of the first connecting rod 304 is hinged to a second connecting rod 306, the other end of the second connecting rod 306 is hinged to a third connecting rod 307, the other end of the third connecting rod 307 is hinged to a second support 305, and the interior of the third connecting rod 307 is connected to a fourth connecting rod 308. 08. The other end of the fourth connecting rod 308 is hinged to the fifth connecting rod 309, and the other end of the fifth connecting rod 309 is connected to the road wheel assembly 310. The first connecting rod 304 is driven to rotate counterclockwise by the oil cylinder 303, so that the first connecting rod 304 pulls the second support 305 upward through the lower end hinge point, thereby tilting the third connecting rod 307 with the slide groove, thereby driving the fourth connecting rod 308, the fifth connecting rod 309, and the road wheel assembly 310 in turn to rotate and realize the lifting of the road wheel.

[0033] Furthermore, the first support 301 and the second support 305 are rigidly fixedly connected to the outer wall of the connecting rod base plate 302 , and the connecting rod base plate 302 is rigidly fixedly connected to the outer wall of the vehicle body structure plate 202 .

[0034] Furthermore, the first support 301 and the cylinder 303 are hingedly connected by a pin, the cylinder 303 and the first connecting rod 304 are hingedly connected by a pin, and the middle of the first connecting rod 304 is hingedly connected to the second support 305 by a pin, the top two ears of the third connecting rod 307 are hingedly connected to the second connecting rod 306 and the second support 305 by a pin, and the second connecting rod 306 and the second support 305 are hingedly connected by a pin. The hinge connection of the pin facilitates the rotational displacement between the connecting rods, changes the arrangement angles of the first support 301 and the cylinder 303, and appropriately changes the shape of the first connecting rod 304, which can simply realize multiple spatial position changes under the same principle. Alternatively, the cylinder 303 can be replaced by other power sources that provide linear motion or stable rotational motion, such as electric push rods, cylinders, servos, etc.

[0035] Furthermore, a sliding groove is provided in the lower half of the third link 307, and the interior of the sliding groove forms a moving sub-link with the end moving body of the fourth link 308. When the third link 307 is tilted, the contact of its sliding groove with the end moving body of the fourth link 308 will cause the fourth link 308 to rotate and displace.

[0036] Furthermore, the fourth connecting rod 308 is connected to the outside of the fork frame 201 through a hinge, the external bracket of the road wheel assembly 310 is rigidly fixedly connected to the end of the fork frame 201, and the road wheel in the road wheel assembly 310 is hingedly connected to the external bracket, and the rotating shaft is interconnected with the fifth connecting rod 309 through a cam. When the fifth connecting rod 309 is displaced, it drives the road wheel to rotate and lift.

[0037] The first road wheel lifting mechanism 203 and the second road wheel lifting mechanism 204 have the same structure, and two guide grooves adapted for the installation and movement of the components of the first road wheel lifting mechanism 203 and the second road wheel lifting mechanism 204 are provided on the fork frame 201, thereby meeting the working requirements of the moving components of the first road wheel lifting mechanism 203 and the second road wheel lifting mechanism 204.

[0038] Working principle: When the present invention is in use, when the slide is in the horizontal limit position, the four-bar structure is close to the dead point position, and at the same time the first connecting rod 304 contacts the side of the connecting rod base plate 302 to form a limit; when working, the oil cylinder 303 drives the first connecting rod 304 to rotate counterclockwise, so the first connecting rod 304 pulls the second support 305 upward through the lower end hinge point, thereby causing the third connecting rod 307 with the slide to tilt, thereby driving the fourth connecting rod 308, the fifth connecting rod 309, and the road wheel assembly 310 in turn, and the road wheel assembly 310 rotates to realize the movement process of lifting the road wheel. When the slide moves to the upper limit position, the first connecting rod 304 contacts the second support 305 to form a mechanical limit. At this point, a complete process of lifting the road wheel is completed.

[0039] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A road wheel lifting device for a mobile pallet truck, characterized in that: include: A fork frame (201), wherein an outer wall of the fork frame (201) is fixedly connected to a vehicle body structure plate (202); A first road wheel lifting mechanism (203) and a second road wheel lifting mechanism (204), wherein the first road wheel lifting mechanism (203) and the second road wheel lifting mechanism (204) are symmetrically distributed on both sides of the fork frame (201) and the vehicle body structure plate (202); The first road wheel lifting mechanism (203) comprises a first support (301), one end of the first support (301) is hinged to an oil cylinder (303), the other end of the first support (301) is connected to a connecting rod base plate (302), the other end of the oil cylinder (303) is hinged to a first connecting rod (304), the other end of the first connecting rod (304) is hinged to a second connecting rod (306), the other end of the second connecting rod (306) is hinged to a third connecting rod (307), the other end of the third connecting rod (307) is hinged to a second support (305), the interior of the third connecting rod (307) is connected to a fourth connecting rod (308), the other end of the fourth connecting rod (308) is hinged to a fifth connecting rod (309), and the other end of the fifth connecting rod (309) is connected to a road wheel assembly (310).

2. The road wheel lifting device for a mobile pallet truck according to claim 1, characterized in that: The first support (301) and the second support (305) are rigidly fixedly connected to the outer wall of the connecting rod bottom plate (302), and the connecting rod bottom plate (302) is rigidly fixedly connected to the outer wall of the vehicle body structure plate (202).

3. The road wheel lifting device for a mobile pallet truck according to claim 1 is characterized in that: The first support (301) and the oil cylinder (303) are hingedly connected via a pin, the oil cylinder (303) and the first connecting rod (304) are hingedly connected via a pin, and the middle of the first connecting rod (304) is hingedly connected to the second support (305) via a pin.

4. The road wheel lifting device for a mobile pallet truck according to claim 1 is characterized in that: The two top ears of the third connecting rod (307) are respectively hingedly connected to the second connecting rod (306) and the second support (305) via a pin, and the second connecting rod (306) and the second support (305) are hingedly connected via a pin.

5. The road wheel lifting device for a mobile pallet truck according to claim 1, characterized in that: A sliding groove is provided at the lower half of the third connecting rod (307), and the interior of the sliding groove forms a moving secondary link with the end moving body of the fourth connecting rod (308).

6. The road wheel lifting device for a mobile pallet truck according to claim 5, characterized in that: The fourth connecting rod (308) is connected to the outside of the fork frame (201) via a hinge, and the external bracket of the road wheel assembly (310) is rigidly fixedly connected to the end of the fork frame (201).

7. The road wheel lifting device for a mobile pallet truck according to claim 5, characterized in that: The first road wheel lifting mechanism (203) and the second road wheel lifting mechanism (204) have the same structure, and the fork frame (201) is provided with two guide grooves adapted for the installation and movement of components of the first road wheel lifting mechanism (203) and the second road wheel lifting mechanism (204).

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