Portal frame front-back moving mechanism for forklift and reach forklift

Abstract

The front-back moving mechanism comprises a left support and a right support, the left support and the right support are located at the bottom, connected with each other and horizontally parallel, and a left sliding groove and a right sliding groove are formed in the opposite inner sides of the left support and the right support in the front-back extending direction respectively. The groove openings of the left sliding groove and the right sliding groove are horizontally and oppositely arranged; the racks are arranged to the tops of the left sliding groove and the right sliding groove respectively and extend in the front-back direction. The two driving gears are arranged at the bottom of a door frame of the forklift and can rotate synchronously, and the two driving gears are arranged on the two sides of the door frame in the left-right direction respectively and meshed with the racks on the corresponding sides; wherein the door frame is positioned between the left bracket and the right bracket; and the rotatable guide wheels are arranged on the portal frame and located below the driving gears on the corresponding sides correspondingly and used for directionally rolling along the left sliding groove and the right sliding groove correspondingly. According to the front-back moving mechanism, the transmission efficiency is high, and the front-back moving mechanism is easier to maintain.

Description

Technical Field

[0001] The utility model relates to the field of handling equipment, in particular to a front-rear moving mechanism of a door frame for a forklift and a reach-type forklift. Background Art

[0002] Forklifts are industrial handling vehicles, which refer to various wheeled handling vehicles used for loading and unloading, stacking and short-distance transportation of palletized goods. They are often used for transporting large objects in warehouses and are usually powered by fuel engines or batteries.

[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 combine the advantages of counterbalanced electric forklifts and stacker trucks, and are increasingly used due to their environmental protection and energy saving, low noise, high lifting capacity, and small operating space.

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

[0005] At present, the mast of reach forklifts is mostly driven by hydraulic cylinders. Due to the certain energy loss in hydraulic transmission, the transmission efficiency is relatively low, and there is also the problem of hydraulic oil leakage, which makes maintenance inconvenient.

[0006] Therefore, a mast forward and backward moving mechanism for a forklift and a reach forklift are needed to at least partially solve the above technical problems. Utility Model Content

[0007] The embodiment of the utility model provides a mast forward and backward moving mechanism for a forklift and a reach forklift, which has high transmission efficiency and is easier to maintain.

[0008] In a first aspect, the present invention provides a front-to-back movement mechanism for a mast of a forklift, the front-to-back movement mechanism comprising:

[0009] A left bracket and a right bracket are located at the bottom and connected to each other, and are parallel to each other. The left bracket and the right bracket are respectively provided with a left slide groove and a right slide groove on the opposite inner sides thereof along the front-back extending direction. The notches of the left slide groove and the right slide groove are configured to be arranged horizontally relative to each other.

[0010] Racks are respectively provided at the top of the left chute and the top of the right chute along the front-to-back extension direction;

[0011] Two synchronously rotatable drive gears provided to the bottom of the mast of the forklift, the two drive gears being respectively provided on both sides of the mast in the left and right directions and meshing with the racks on the corresponding sides; wherein the mast is located between the left bracket and the right bracket; and

[0012] Rotatable guide wheels are provided to the door frame below the driving gears on the corresponding sides, and are used for directionally rolling along the left and right slide grooves respectively.

[0013] According to the forward and backward moving mechanism of the utility model, when the driving gear arranged on the gantry rotates, the driving gear engages the rack, and under the guidance of the guide wheel rolling along the left slide groove and the right slide groove, the gantry can move forward and backward along the forward and backward extension direction relative to the left bracket and the right bracket. Compared with the existing hydraulic transmission method, the gantry adopts a transmission method of gears and racks, which has higher transmission efficiency and is easy to maintain.

[0014] In a second aspect, the present invention further provides a reach forklift, comprising the forward and backward moving mechanism of the above technical solution.

[0015] According to the reach forklift of the present invention, due to the adoption of the forward and backward moving mechanism of the present invention, compared with the hydraulic drive method, the mast is driven by gears and racks to achieve forward and backward movement, which is easier to move and convenient to maintain.

[0016] 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.

[0017] 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

[0018] 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:

[0019] Figure 1 Schematic diagram of the connection between the door frame and the driving mechanism in the forward and backward movement mechanism according to one embodiment of the present utility model;

[0020] Figure 2 Schematic diagram of a driving mechanism in a forward and backward moving mechanism according to an embodiment of the present utility model;

[0021] Figure 3is a schematic diagram of the connection between the left bracket and the right bracket in the forward and backward movement mechanism according to an embodiment of the present utility model; and

[0022] Figure 4 This is a schematic diagram of the connection between the left bracket, the right bracket and the driving mechanism in the forward and backward moving mechanism according to one embodiment of the utility model, and the door frame is hidden in this figure.

[0023] Description of reference numerals:

[0024] 111. Left bracket; 112. Right bracket; 113. Door frame; 114. Left door frame; 115. Right door frame; 116. Crossbeam; 121. Left slide; 122. Right slide; 130. Rack; 141. Drive gear; 142. Guide wheel; 150. Drive mechanism; 151. Motor; 152. Rotating shaft; 160. Connecting beam; 161. Top plate; 162. Rear side plate; 163. Opening; 170. Anti-collision strip. DETAILED DESCRIPTION

[0025] 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.

[0026] 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.

[0027] 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".

[0028] 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.

[0029] The utility model provides a forklift mast forward and backward movement mechanism, which can be used in the field of handling equipment, such as a reach forklift, and can solve the problems of low transmission efficiency and inconvenient maintenance of the existing reach forklift mast forward and backward movement mechanism.

[0030] First of all, when a reach forklift is operating, the side of the mast 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.

[0031] The utility model provides a mechanism for moving the mast forward and backward for a forklift. In a preferred embodiment, Figure 1 and Figure 4 As shown, Figure 1 Schematic diagram of the connection between the door frame 113 and the driving mechanism 150 in the forward and backward moving mechanism according to an embodiment of the present invention. Figure 4 FIG2 is a schematic diagram showing the connection between the left bracket 111, the right bracket 112 and the drive mechanism 150 in the forward and backward movement mechanism according to an embodiment of the present invention. The forward and backward movement mechanism of the gantry may include the left bracket 111, the right bracket 112, the rack 130, the drive gear 141 and the guide wheel 142.

[0032] The left and right brackets 111 and 112, the existing basic structure of the forklift, house the left and right chutes 121 and 122, respectively. Racks 130, located in the left and right chutes 121 and 122, respectively, serve as a crucial component for driving the mast 113 forward and backward. Drive gear 141, in conjunction with rack 130, is another crucial component for enabling the movement of mast 113. Guide wheels 142 provide directional guidance for mast 113 during forward and backward movement.

[0033] Specifically, the left bracket 111 and the right bracket 112 are located at the bottom of the forklift, and the left bracket 111 and the right bracket 112 are connected to each other and arranged horizontally and parallel. Among them, at least one movable wheel can be installed at the bottom of the left bracket 111 and the right bracket 112. The movable wheel can be a driving axle or a passive wheel. For example, a driving wheel, or a driving wheel and a passive wheel can be installed at the bottom of the left bracket 111 and the right bracket 112 respectively, and they can be arranged reasonably according to specific needs. The left bracket 111 and the right bracket 112 are respectively provided with a left slide groove 121 and a right slide groove 122 on the relative inner sides along the front-to-back extension direction. The left slide groove 121 and the right slide groove 122 can be arranged along the inner sides of the corresponding left bracket 111 and the right bracket 112, extending from the rear end to the front end. In addition, the notches of the left slide groove 121 and the right slide groove 122 are arranged horizontally relative to each other.

[0034] The front-rear moving mechanism of the mast of the present invention comprises two racks 130 arranged horizontally along the front-rear extending direction. The two racks 130 are respectively arranged on the top of the left slide groove 121 and the right slide groove 122.

[0035] The mast forward and backward movement mechanism of the present invention includes two synchronously rotatable drive gears 141. These drive gears 141 are located at the bottom of the forklift's mast 113. They are positioned on either side of the mast 113, left and right. Each drive gear 141 engages with the corresponding rack 130 to achieve gear-and-rack transmission. The mast 113 is located between the left support 111 and the right support 112. The mast 113 can utilize existing technology and will not be described in detail here.

[0036] The guide wheels 142 are positioned below the drive gear 141 on the corresponding side of the gantry 113. There is at least one guide wheel 142 on each side. For example, there may be one, two, or another suitable number of guide wheels 142 on each side. The guide wheels 142 can rotate about a horizontal axis so that each guide wheel 142 can roll directionally along the corresponding left and right chutes 121 and 122.

[0037] Based on the technical solution described above, when in use, when the driving gears 141 on both sides of the door frame 113 rotate, since the driving gears 141 engage with the connected rack 130, under the guiding action of the guide wheels 142 rolling along the left slide groove 121 and the right slide groove 122 respectively, the door frame 113 moves forward and backward along the front and rear extension direction relative to the left bracket 111 and the right bracket 112.

[0038] According to the gantry forward and backward movement mechanism of the present invention, compared with the existing hydraulic transmission method, the gantry 113 adopts a transmission method of gears and racks 130, which has higher transmission efficiency and is easy to maintain.

[0039] In order to realize the rotation of the driving gear 141, the gantry forward and backward movement mechanism according to the present invention may further include a driving mechanism 150 provided on the gantry 113 for driving the two driving gears 141 to rotate synchronously.

[0040] Specifically, refer to Figure 2 , Figure 2 Schematic diagram of a drive mechanism 150 in a gantry forward and backward movement mechanism according to one embodiment of the present invention. The drive mechanism 150 may include a motor 151 and a rotating shaft 152. The motor 151 may be mounted on the gantry 113 to provide a driving force. The rotating shaft 152 may also be mounted on the gantry 113, with its power connected to the motor 151 to rotate and thereby synchronously drive the drive gear 141. The transmission between the rotating shaft 152 and the motor 151 may be a belt drive, a sprocket drive, or the like, and is not limited thereto.

[0041] The rotating shaft 152 extends in the left and right directions to the two ends of the outer side of the door frame 113, and a driving gear 141 is provided at each end. Figure 1 .

[0042] Regarding the specific position arrangement of the motor 151 and the rotating shaft 152 in the driving mechanism 150, for example, the gantry 113 can include a left gantry 114, a right gantry 115 and a bottom crossbeam 116 with both ends respectively connecting the left gantry 114 and the right gantry 115.

[0043] The crossbeam 116 may include a rearwardly protruding enclosure, or may even include a cover plate and a bottom plate. The remaining portions of the motor 151 and the rotating shaft 152 excluding the two ends on which the driving gear 141 is sleeved are all arranged on the inner side of the crossbeam 116.

[0044] refer to Figure 3 , Figure 3 Schematic diagram of the connection between the left bracket 111 and the right bracket 112 in the forward and backward moving mechanism according to an embodiment of the present utility model. In order to achieve the connection and fixation between the left bracket 111 and the right bracket 112, the forward and backward moving mechanism may further include a connecting beam 160. The two ends of the connecting beam 160 located at the rear are respectively connected to the left bracket 111 and the right bracket 112. The connecting beam 160 can be raised upward by a certain height relative to the left bracket 111 and the right bracket 112, so that the connection between the connecting beam 160 and the left bracket 111 and the right bracket 112 forms a step structure, which is equivalent to a limiting structure, and plays a role in preventing the door frame 113 from moving backward. In order to protect the connecting beam 160, an anti-collision strip 170 extending in the left and right directions can be provided on the rear side of the connecting beam 160.

[0045] The connecting beam 160 may be a three-dimensional plate frame structure with an open bottom formed by a top plate 161 and rear side plates 162. The top plate 161 of the connecting beam 160 may further be provided with openings 163 at positions corresponding to the left bracket 111 and the right bracket 112 for passing cables related to the forklift.

[0046] On the other hand, the present invention also provides a reach truck (not shown) comprising the fore-and-aft moving mechanism of the above embodiment. Therefore, the forklift according to the present invention includes all the features and effects of the fore-and-aft moving mechanism according to the present invention.

[0047] 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 mechanism for moving the mast forward and backward for a forklift, characterized in that: The forward and backward movement mechanism comprises: A left bracket and a right bracket are located at the bottom and connected to each other, and are parallel to each other. The left bracket and the right bracket are respectively provided with a left slide groove and a right slide groove on the opposite inner sides thereof along the front-back extending direction. The notches of the left slide groove and the right slide groove are configured to be arranged horizontally relative to each other. Racks are respectively provided at the top of the left chute and the top of the right chute along the front-to-back extension direction; Two synchronously rotatable drive gears provided to the bottom of the mast of the forklift, the two drive gears being respectively provided on both sides of the mast in the left and right directions and meshing with the racks on the corresponding sides; wherein the mast is located between the left bracket and the right bracket; and Rotatable guide wheels are provided to the door frame below the driving gears on the corresponding sides, and are used for directionally rolling along the left and right slide grooves respectively.

2. The forward and backward movement mechanism according to claim 1, characterized in that: The forward and backward moving mechanism also includes a driving mechanism provided to the door frame, which is used to drive the two driving gears to rotate synchronously.

3. The forward and backward movement mechanism according to claim 2, characterized in that: The driving mechanism comprises: A motor provided to the gantry for providing driving force; a rotatable shaft provided to the gantry, the shaft being motively connected to the motor; Wherein, the rotating shaft extends in the left and right directions to the two ends of the outer side of the door frame, and the driving gears are respectively provided.

4. The forward and backward movement mechanism according to claim 3, characterized in that: The gantry comprises a left gantry, a right gantry and a bottom crossbeam with two ends respectively connected to the left gantry and the right gantry; The crossbeam at least includes a section of a panel protruding rearward, and the remaining parts of the motor and the rotating shaft except for the driving gear are arranged on the inner side of the crossbeam.

5. The forward and backward movement mechanism according to claim 1, characterized in that: The forward and backward moving mechanism also includes a connecting beam located at the rear, with its two ends respectively connected to the left bracket and the right bracket. The connecting beam is constructed to protrude upward by a certain height relative to the left bracket and the right bracket, and a crash strip extending in the left and right directions is provided on the rear side of the connecting beam.

6. The forward and backward movement mechanism according to claim 5, characterized in that: The connecting beam is a three-dimensional plate frame structure with an open bottom formed by a top plate and rear side plates. The top plate of the connecting beam is also provided with openings at positions corresponding to the left bracket and the right bracket respectively for cables to enter and exit.

7. A reach forklift, characterized in that: The device comprises the forward and backward movement mechanism as claimed in any one of claims 1 to 6.

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