Fork lifting mechanism for forklift and forklift

Abstract

The utility model provides a pallet fork lifting mechanism for a forklift and the forklift, and the lifting mechanism comprises an outer door frame, an inner door frame, an inner door frame, an outer cross beam, an inner door frame, a lifting mechanism and a lifting mechanism, and the outer door frame comprises a left outer door frame, a right outer door frame and an outer cross beam, first sliding grooves extending in the vertical direction are formed in the opposite inner sides of the left outer door frame and the right outer door frame correspondingly. The inner door frame is located between the left outer door frame and the right outer door frame and can move up and down relative to the outer door frames in the vertical direction, and second sliding grooves extending in the vertical direction are formed in the opposite inner sides of the left inner door frame and the right inner door frame correspondingly; the first lifting driving assembly is arranged on the inner side of the outer cross beam; the pallet fork is located between the left inner portal frame and the right inner portal frame, the pallet fork can move up and down relative to the inner portal frames in the vertical direction, the pallet fork comprises a left fork rod, a right fork rod and a connecting part, the two ends of the connecting part are connected to the left fork rod and the right fork rod respectively, and the connecting part is provided with a second guide wheel which rotates around a horizontal shaft and can roll along a second sliding groove. According to the lifting mechanism provided by the utility model, the lifting height of the pallet fork is larger, and the safety is higher.

Description

Technical Field

[0001] The utility model relates to the field of handling equipment, in particular to a cargo fork lifting mechanism for a forklift and the forklift. Background Art

[0002] Forklifts are industrial handling vehicles, specifically wheeled vehicles used for loading, unloading, stacking, and short-distance transport of palletized cargo. They are commonly used for transporting large objects in warehouses and are typically powered by a fuel engine or battery. Key technical parameters include: rated lift capacity, load center distance, maximum lift height, mast inclination angle, maximum speed, minimum turning radius, minimum ground clearance, and wheelbase and track width.

[0003] Among them, with the rapid development of my country's manufacturing and logistics industries, storage in automated warehouses has become a basic need in all walks of life. Reach forklifts are becoming more and more widely used due to their environmental protection and energy saving, low noise, high lifting capacity, and small working space, especially AGV forklifts.

[0004] In the process of implementing the present invention, the inventors discovered that the prior art has at least the following problems:

[0005] The forklift's lifting mechanism typically consists of a mast and a fork that moves vertically along the mast. This limited forklift's ability to lift and lower, making it unsuitable for operations exceeding a certain height. Furthermore, the fork's drive system often utilizes a hydraulic cylinder. This system suffers from energy loss, resulting in relatively low transmission efficiency, hydraulic oil leakage, and inconvenient maintenance.

[0006] Therefore, a fork lifting mechanism for a forklift and a forklift are needed to at least partially solve the above technical problems. Utility Model Content

[0007] The embodiment of the utility model provides a fork lifting mechanism for a forklift and a forklift, wherein the lifting height of the forklift is greater and the safety is higher.

[0008] In a first aspect, the present invention provides a fork lifting mechanism for a forklift, wherein the lifting mechanism is provided to a chassis mechanism of the forklift, and comprises:

[0009] The bottom portion is used to connect to an outer mast of the chassis mechanism of the forklift, and the outer mast is constructed as a front-to-back open structure, including a left outer mast, a right outer mast, and an outer crossbeam located at the top and connected to the left outer mast and the right outer mast at both ends; the left outer mast and the right outer mast are both provided with a first slide groove extending vertically on opposite inner sides, and the outer crossbeam includes at least one section of a panel protruding toward the rear;

[0010] an inner mast located between the left outer mast and the right outer mast, the inner mast also being constructed as a front-to-rear open structure and being movable up and down in a vertical direction relative to the outer mast, comprising a left inner mast and a right inner mast connected to each other and slidable in first sliding grooves of the left outer mast and the right outer mast respectively; second sliding grooves extending vertically are provided on opposite inner sides of the left inner mast and the right inner mast;

[0011] a first lifting drive assembly provided on the inner side of the outer crossbeam, for providing a driving force for driving the inner mast to move up and down in a vertical direction relative to the outer mast; and

[0012] The cargo fork is located between the left inner mast and the right inner mast, and is constructed to be movable up and down in the vertical direction relative to the inner mast, and includes a left fork rod, a right fork rod, and a connecting portion whose two ends are respectively connected to the left fork rod and the right fork rod, and the connecting portion is provided with a second guide wheel that rotates around a horizontal axis and can roll along the second slide groove.

[0013] According to the fork lifting mechanism of the utility model, it includes an outer mast, an inner mast and a fork, etc. The inner mast can move up and down in the vertical direction relative to the outer mast, and at the same time the fork can move up and down in the vertical direction relative to the inner mast. Overall, the fork realizes two-level lifting, and compared with the existing technology, the first lifting drive component is entirely arranged on the inner side of the outer crossbeam, which can avoid contact with operators or other objects and is safer.

[0014] In a second aspect, the present invention further provides a forklift comprising the lifting mechanism of the above technical solution.

[0015] According to the forklift of the present invention, due to the adoption of the lifting mechanism of the present invention, the lifting height of its fork is greater, which can meet higher operating requirements and has a wider range of applications. In addition, compared with the existing technology, the first lifting drive component is entirely arranged on the inner side of the outer beam, which can avoid contact with operators or other objects and is safer.

[0016] By utilizing the technical solution according to the embodiment of the present utility model, the beneficial effects that can be obtained are at least:

[0017] 1. The fork lifting mechanism of the utility model is that the inner mast can move up and down in the vertical direction relative to the outer mast, and the fork can move up and down in the vertical direction relative to the inner mast. The fork can achieve two-stage lifting and lowering, and the lifting height is greater;

[0018] 2. In the fork lift mechanism of the present invention, the first lift drive assembly is entirely arranged on the inner side of the outer crossbeam, which can avoid contact with operators or other objects and improve safety.

[0019] 3. The fork lifting mechanism of the utility model realizes the relative movement between the inner mast and the outer mast through a gear rack and other mechanisms. Compared with the existing hydraulic transmission mechanism, the transmission efficiency is higher and it is easier to maintain.

[0020] Additional advantages, purposes, and features of the present invention will be partially set forth in the following description and will partially become apparent to those skilled in the art after studying the following or may be learned from practice of the present invention. The purposes and other advantages of the present invention may be achieved and obtained by the structures specifically pointed out in the specification and drawings.

[0021] Those skilled in the art will understand that the purposes and advantages that can be achieved by the present invention are not limited to those specifically described above, and the above and other purposes that can be achieved by the present invention will be more clearly understood based on the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings described herein are intended to provide a further understanding of the present invention, constitute a part of this application, and do not constitute a limitation of the present invention. The components in the drawings are not drawn to scale, but are merely for the purpose of illustrating the principles of the present invention. To facilitate the illustration and description of some parts of the present invention, the corresponding parts in the drawings may be enlarged, that is, they may be larger than other components in the exemplary device actually manufactured according to the present invention. In the drawings:

[0023] Figure 1 It is a structural diagram of an existing fork lifting mechanism (part);

[0024] Figure 2 This is an exploded schematic diagram of a fork lift mechanism for a forklift according to an embodiment of the present invention;

[0025] Figure 3 Schematic diagram of the connection between the outer mast and the first lifting drive assembly in the fork lifting mechanism of a forklift according to one embodiment of the present invention;

[0026] Figure 4 Schematic diagram of a first lifting drive assembly in a fork lifting mechanism of a forklift according to an embodiment of the present invention;

[0027] Figure 5 Schematic diagram of the connection between the inner mast and the second lifting drive assembly in the fork lifting mechanism of a forklift according to one embodiment of the present invention;

[0028] Figure 6 is a schematic diagram of a second lifting drive assembly in a fork lifting mechanism of a forklift according to an embodiment of the present invention; and

[0029] Figure 7 The figure is a schematic diagram of a fork in a fork lifting mechanism of a forklift according to an embodiment of the present invention.

[0030] Description of reference numerals:

[0031] 10. Fork lift mechanism; 11. Mast; 12. Crossbeam; 13. Motor; 14. Ring gear;

[0032] 100. Lifting mechanism;

[0033] 110, outer door frame; 111, left outer door frame; 112, right outer door frame; 113, outer crossbeam; 114, first chute; 115, enclosure;

[0034] 120, inner mast; 121, left inner mast; 122, right inner mast; 123, second chute; 124, inner crossbeam; 125, lifting ring; 126, limit block;

[0035] 130. First lifting drive assembly; 131. Motor; 132. Rotating shaft; 133. Gear; 134. Rack; 135. First guide wheel;

[0036] 140. Fork; 141. Connecting portion; 142. Second guide wheel; 143. Chain connecting rod;

[0037] 150. Second lifting drive assembly; 151. Roller; 152. Chain. DETAILED DESCRIPTION

[0038] The objectives and functions of the present invention, as well as methods for achieving these objectives and functions, will be clarified with reference to exemplary embodiments. However, the present invention is not limited to the exemplary embodiments disclosed below; it can be implemented in various forms. The essence of this specification is merely to help those skilled in the relevant art to comprehensively understand the specific details of the present invention.

[0039] It should be noted that the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof.

[0040] Ordinal numbers such as "first" and "second" cited in the present invention are merely identifiers and do not have any other meanings, such as a specific order, etc. Moreover, for example, the term "first component" itself does not imply the existence of a "second component", and the term "second component" itself does not imply the existence of a "first component".

[0041] It should be noted that the terms "upper", "lower", "front", "back", "left", "right", "inside", "outside" and similar expressions used in this document are for illustrative purposes only and are not limiting.

[0042] The present invention provides a forklift lifting mechanism 100 for a forklift. The lifting mechanism 100 can be applied to, for example, the field of handling equipment, such as a forklift, and can solve the problem of relatively limited forklift lifting height in existing forklift lifting mechanisms.

[0043] First of all, when the forklift is operating, the side with the fork closer to the object to be transported is the front, and the other side relatively farther away from the object to be transported is the rear. At the same time, based on facing forward, the left side is the left, and the right side is the right.

[0044] The utility model provides a fork lifting mechanism for a forklift. In a preferred embodiment, Figure 2 As shown, Figure 2 FIG1 is an exploded view of a forklift lifting mechanism for a forklift according to an embodiment of the present invention. The forklift lifting mechanism 100 may include an outer mast 110 , an inner mast 120 , a first lifting drive assembly 130 , and a fork 140 .

[0045] The outer mast 110 supports the inner mast 120 and forks 140, and together with the inner mast 120, forms the entire mast. The inner mast 120 supports the forks 140, enabling their movable mounting. The forks 140 are used to pick up objects to be transported. The first lift drive assembly 130 provides the driving force that propels the inner mast 120 up and down vertically relative to the outer mast 110.

[0046] Specifically, the bottom of the outer mast 110 is used to connect to the chassis of the forklift, and the connection between the two can be fixed or movable. The chassis of the forklift is not the invention of the present invention and will not be described here.

[0047] refer to Figure 3 , Figure 3Schematic diagram of the connection between the outer mast 110 and the first lifting drive assembly 130 in the fork lifting mechanism for a forklift according to one embodiment of the present invention. The outer mast 110 can be a structure open at the front and back to facilitate the up and down movement of the inner mast 120 and the fork 140. The outer mast 110 can include a vertical left outer mast 111 and a right outer mast 112, and an outer crossbeam 113 located at the top and connected to the left outer mast 111 and the right outer mast 112 at both ends. The left outer mast 111 and the right outer mast 112 are both provided with a first slide groove 114 extending vertically on the opposite inner sides. For example, the left outer mast 111 and the right outer mast 112 can be U-shaped plates that enclose the first slide groove 114. The specific type of the outer crossbeam 113 may not be limited. For example, the outer crossbeam 113 may include a vertical panel 115 protruding toward the rear. The top and / or bottom of the panel 115 may also be provided with corresponding top plates and floors to form a semi-enclosed type.

[0048] refer to Figure 1 , Figure 1 FIG. 1 is a schematic diagram of the structure of an existing fork lift mechanism 10 (partial), which includes a mast 11, a crossbeam 12, a motor 13 and a gear ring 14. Figure 1 It can be seen that the lifting drive component (including the motor 13 and the ring gear 14) used to drive the fork and the like to move up and down, wherein the ring gear 14 and the driving gear on the motor output shaft engaged with the ring gear are both located on the outside of the beam, which first requires more holes to be opened on the beam 12. At the same time, the ring gear is located on the outside of the beam, which poses a safety hazard. If the safety hazard needs to be resolved, additional structures such as protective covers need to be set up, which increases costs.

[0049] In order to solve the above problems, the first lifting drive assembly 130 in the present application is completely arranged on the inner side of the outer crossbeam 113. Specifically, refer to Figure 3 and Figure 4 ,in Figure 4 FIG. 1 is a schematic diagram of a first lifting drive assembly 130 in a fork lifting mechanism of a forklift according to an embodiment of the present invention. The first lifting drive assembly 130 may include a motor 131 and a rotating shaft 132 .

[0050] Specifically, a motor 131 is disposed inside the outer crossbeam 113 to provide power. A rotating shaft 132, extending horizontally and arranged inside the outer crossbeam 113, is connected to the motor 131 to achieve rotation. For example, a belt drive, sprocket drive, or other transmission method can be used between the motor 131 and the rotating shaft 132. Gears 133 are respectively mounted on each end of the rotating shaft 132.

[0051] refer to Figure 5 , Figure 5The figure shows the connection between the inner mast 120 and the second lift drive assembly 150 in a forklift lift mechanism for a forklift according to one embodiment of the present invention. The inner mast 120 is located between the left outer mast 111 and the right outer mast 112 and is vertically movable relative to the outer mast 110. The inner mast 120 is also constructed with an open front and rear structure to facilitate the up and down movement of the forks 140. The inner mast 120 includes a left inner mast 121 and a right inner mast 122, which are interconnected and slide up and down within first guide slots 114 of the left and right outer masts 111 and 112, respectively. For example, the left and right inner masts 121 and 122 can be connected and fixed by an inner crossbeam 124 at the top. Second guide slots 123 extending vertically are provided on the opposing inner sides of each of the left and right inner masts 121 and 122.

[0052] refer to Figure 7 , shows the structure of the fork 140 of this embodiment. The fork 140 is located between the left inner mast 121 and the right inner mast 122 and can move up and down in the vertical direction relative to the inner mast 120. The fork 140 includes a left fork rod, a right fork rod, and a connecting portion 141 connected to the left fork rod and the right fork rod at both ends. For example, the connecting portion 141 can be in the form of a vertical plate. A second guide wheel 142 is provided on the rear side surface of the vertical plate, which rotates around a horizontal axis and can roll along the second slide groove 123 on the corresponding side. When the fork 140 moves up and down in the vertical direction relative to the inner mast 120, the second guide wheel 142 moves along the second slide groove 123.

[0053] According to the fork lifting mechanism 100 of the present invention, the inner mast 120 can move up and down in the vertical direction relative to the outer mast 110, and at the same time the fork 140 can move up and down in the vertical direction relative to the inner mast 120. The fork 140 can achieve two-stage lifting, and compared with the existing technology, the first lifting drive assembly 130 is entirely arranged on the inner side of the outer crossbeam 113, which can avoid contact with operators or other objects and is safer.

[0054] To enable the inner mast 120 to move up and down relative to the outer mast 110, the lifting mechanism 100 may further include a transmission assembly connected to the first lifting drive assembly 130, for transmitting the driving force provided by the first lifting drive assembly 130 to the inner mast 120 to enable its up and down movement. The transmission assembly may include vertical racks 134 respectively disposed on the left inner mast 121 and the right inner mast 122, which mesh with gears 133.

[0055] To achieve better directional trajectory vertical movement of the inner mast 120, the transmission assembly may further include a guide wheel assembly disposed between the outer sides of the left inner mast 121 and the right inner mast 122 and the corresponding first guide slots 114. For example, the left inner mast 121 and the right inner mast 122 may be I-shaped structures, and the guide wheel assembly includes first guide wheels 135 that rotate around a horizontal axis and are disposed at the top of the first guide slot 114 and at the bottom of the outer sides of the left inner mast 121 and the right inner mast 122. Specifically, a first guide wheel 135 is disposed at the top of each first guide slot 114 on both sides, and a first guide wheel 135 is disposed at the bottom of each outer side of the left inner mast 121 and the right inner mast 122.

[0056] Furthermore, the lifting mechanism further includes a second lifting drive assembly 150 provided to the inner mast 120 for driving the fork 140 to move up and down in a vertical direction relative to the inner mast 120 .

[0057] refer to Figure 5 and Figure 6 , Figure 6 FIG2 is a schematic diagram of a second lifting drive assembly 150 in a fork lifting mechanism of a forklift according to an embodiment of the present invention. The second lifting drive assembly 150 may include a roller 151 and a lifting unit.

[0058] Among them, a roller 151 that rotates around a horizontal axis is provided on the inner mast 120. For example, a roller 151 can be provided on each side of the beam along the length direction. The vertically extending pulling unit that bypasses the roller 151 can be a chain 152, a rope or other structure. One end of the chain 152 is fixed to the outer mast 110. The other end of the chain 152 is fixed to the fork 140. For example, the front end of the chain 152 is connected to the fork 140, and the rear end of the chain 152 is connected to the outer mast 110. For example, a chain connecting rod 143 for connecting the chain 152 is provided on the vertical plate of the fork 140. In addition, a lifting ring 125 can be provided on the top surface of the inner crossbeam 124 to facilitate the installation of the inner mast 120.

[0059] In this way, driven by the motor 131, the gear 133 and the rack 134, when the inner mast 120 moves upward relative to the outer mast 110, while the height of the inner mast 120 is increased, since one end of the chain 152 is fixed to the outer mast 110 and the other end of the chain 152 is fixed to the fork 140, the fork 140 is pulled upward by the chain 152. That is, when the inner mast 120 moves upward a distance H relative to the outer mast 110, the fork 140 will also move upward a distance H relative to the inner mast 120. In general, the fork 140 moves upward a distance of 2H relative to the outer mast 110, thereby achieving a faster height increase, and similarly, a faster descent.

[0060] In order to ensure greater safety when the fork 140 moves up and down, a limit block 126 can be further provided at the top position of the second slide slot 123 of the left inner mast 121 and / or the right inner mast 122 to limit the upward movement of the fork 140.

[0061] On the other hand, the present invention further provides a forklift (not shown), which includes the lifting mechanism 100 of the above embodiment. Therefore, the forklift according to the present invention includes all the features and effects of the lifting mechanism 100 according to the present invention.

[0062] In addition, the lifting mechanism may be a mechanism that can move forward and backward relative to the chassis mechanism of the forklift, that is, the forklift may be a reach forklift.

[0063] In combination with the description and practice of the utility model disclosed herein, other embodiments of the utility model are easy to think of and understand for those skilled in the art. The description and embodiments are considered to be exemplary only, and the true scope and spirit of the utility model are defined by the claims.

Claims

1. A forklift lifting mechanism for a forklift, wherein the lifting mechanism is provided to a chassis of the forklift, characterized in that: include: The bottom portion is used to connect to an outer mast of the chassis mechanism of the forklift, and the outer mast is constructed as a front-to-back open structure, including a left outer mast, a right outer mast, and an outer crossbeam located at the top and connected to the left outer mast and the right outer mast at both ends; the left outer mast and the right outer mast are both provided with a first slide groove extending vertically on opposite inner sides, and the outer crossbeam includes at least one section of a panel protruding toward the rear; an inner mast located between the left outer mast and the right outer mast, the inner mast also being constructed as a front-to-rear open structure and being movable up and down in a vertical direction relative to the outer mast, comprising a left inner mast and a right inner mast connected to each other and slidable in first sliding grooves of the left outer mast and the right outer mast respectively; second sliding grooves extending vertically are provided on opposite inner sides of the left inner mast and the right inner mast; A first lifting drive assembly provided on the inner side of the outer crossbeam, for providing a driving force for driving the inner mast to move up and down in a vertical direction relative to the outer mast; as well as The cargo fork is located between the left inner mast and the right inner mast, and is constructed to be movable up and down in the vertical direction relative to the inner mast, and includes a left fork rod, a right fork rod, and a connecting portion whose two ends are respectively connected to the left fork rod and the right fork rod, and the connecting portion is provided with a second guide wheel that rotates around a horizontal axis and can roll along the second slide groove.

2. The lifting mechanism according to claim 1, characterized in that: The first lifting drive assembly includes: a motor disposed on the inner side of the outer crossbeam; The power arranged on the inner side of the outer crossbeam is connected to the rotating shaft of the motor, and the two ends of the rotating shaft are respectively sleeved with gears; The lifting mechanism further includes a transmission assembly connected to the first lifting drive assembly, for transmitting the driving force provided by the first lifting drive assembly to the inner mast to achieve up and down movement, the transmission assembly including: The vertical racks meshing with the gears are respectively provided to the left inner mast and the right inner mast.

3. The lifting mechanism according to claim 2, characterized in that: The transmission assembly also includes a guide wheel group respectively arranged between the outer sides and first sliding grooves of the corresponding sides of the left inner door frame and the right inner door frame, which is used to limit the inner door frame to move up and down along a set vertical track.

4. The lifting mechanism according to claim 3, characterized in that: The left inner door frame and the right inner door frame are constructed as an I-shaped structure, and the guide wheel group includes a first guide wheel that rotates around a horizontal axis and is respectively arranged at the top of the first slide groove and the bottom of the outer side of the left inner door frame and the right inner door frame.

5. The lifting mechanism according to claim 1, characterized in that: The lifting mechanism further includes a second lifting drive assembly provided to the inner mast, for driving the fork to move up and down in a vertical direction relative to the inner mast.

6. The lifting mechanism according to claim 5, characterized in that: The second lifting drive assembly includes: A roller provided to the inner mast and rotating about a horizontal axis; A vertically extending lifting unit bypasses the roller, one end of the lifting unit is fixedly connected to the outer mast, and the other end of the lifting unit is fixedly connected to the fork.

7. The lifting mechanism according to claim 6, characterized in that: The inner door frame also includes an inner crossbeam whose two ends are located at the top and are respectively connected to the left inner door frame and the right inner door frame, and the rollers are respectively provided on both sides of the inner crossbeam along the length direction.

8. The lifting mechanism according to claim 7, characterized in that: A limit block is further provided at the top of the second slide groove of the left inner mast and / or the right inner mast to limit the upward movement of the fork; and / or The inner crossbeam is also connected to lifting rings to facilitate installation.

9. A forklift, characterized in that: The utility model comprises a lifting mechanism as claimed in any one of claims 1 to 8.

10. The forklift according to claim 9, characterized in that The lifting mechanism is configured to be movable forward and backward relative to a chassis mechanism of the forklift.

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