Forklift gantry and middle cylinder axial limiting device thereof

Abstract

The invention discloses a forklift gantry and a middle cylinder axial limiting device thereof.The middle cylinder axial limiting device comprises a first limiting plate arranged below one side of the gantry and a second limiting plate correspondingly arranged on one side of the first limiting plate through a fastener, a first limiting groove is formed in the end face of the first limiting plate, and a second limiting groove is formed in the end face of the second limiting plate; a first limiting groove is formed in the end face of the first limiting plate, a second limiting groove is formed in the end face of the second limiting plate, the first limiting groove corresponds to the second limiting groove, a limiting block is arranged at the bottom of the middle cylinder and arranged between the first limiting groove and the second limiting groove, and the axial position of the limiting block can be limited through the first limiting groove and the second limiting groove. The middle cylinder is simple in structure and convenient to disassemble and assemble, axial displacement of the middle cylinder is effectively limited through cooperation of the first limiting plate, the second limiting plate and the limiting block, then cargo shaking is remarkably reduced, for some high-lifting forklift gantries, the stability and operation safety of the high-lifting forklift gantries under the heavy load working condition are improved, and good practicability is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of forklift masts, and in particular relates to a forklift mast and an axial limiting device for an intermediate cylinder thereof. Background Art

[0002] The forklift mast is the main load-bearing structure of the forklift device. As a mechanism for lifting goods, it is also called a door frame. It consists of an inner mast, an outer mast, a fork frame, forks, sprockets, chains, a lifting cylinder and an intermediate cylinder. In the forklift mast system, the intermediate cylinder includes a cylinder barrel and a piston rod which are nested with each other, wherein the cylinder barrel is fixed to the outer mast, and the upper end of the piston rod is fixed to the sprocket mechanism.

[0003] In the prior art, the middle part of the intermediate cylinder is fixed to the door frame by a guard plate, and threaded holes are correspondingly provided on the guard plate and the door frame, and the intermediate cylinder is fixed through the engagement between the fastener and the threaded hole. A support plate is provided at the lower side of the door frame, and a through hole is provided in the support plate. A pin shaft is provided at the bottom of the intermediate cylinder, and the pin shaft is inserted into the through hole. However, since the guard plate and the pin shaft can only achieve radial limitation of the intermediate cylinder, for some high-lift forklift masts, under their heavy load conditions, cargo jumping or shaking may occur, which seriously affects the overall operational stability and safety of the forklift. In summary, there is an urgent need for an axial limiting device for a forklift mast and its intermediate cylinder. Summary of the invention

[0004] In order to solve part or all of the technical problems existing in the above-mentioned prior art, the present invention provides an axial limiting device for a forklift mast and an intermediate cylinder thereof.

[0005] On the one hand, the present invention provides an intermediate cylinder axial limiting device for a forklift mast, wherein the intermediate cylinder axial limiting device is arranged between the mast and the intermediate cylinder, a guard plate is connected to the middle portion of the mast by fasteners, and the intermediate cylinder is arranged between the guard plate and the mast, and is characterized in that the intermediate cylinder axial limiting device comprises a first limiting plate arranged below one side of the mast, and a second limiting plate correspondingly arranged on one side of the first limiting plate by the fasteners, a first limiting groove is provided on the end face of the first limiting plate, a second limiting groove is provided on the end face of the second limiting plate, the first limiting groove and the second limiting groove are arranged corresponding to each other, a limiting block is provided at the bottom of the intermediate cylinder, the limiting block is arranged between the first limiting groove and the second limiting groove, and the axial position of the limiting block can be limited by the first limiting groove and the second limiting groove.

[0006] Furthermore, in the above-mentioned intermediate cylinder axial limiting device for a forklift mast, the limiting block comprises a first shaft segment and a second shaft segment connected to each other, and the axes of the first shaft segment and the second shaft segment coincide with the axis of the intermediate cylinder.

[0007] Furthermore, in the above-mentioned intermediate cylinder axial limiting device for a forklift mast, the second shaft segment is arranged below the first shaft segment, the first shaft segment is connected between the second shaft segment and the bottom of the intermediate cylinder, and the diameter of the second shaft segment is larger than the diameter of the first shaft segment.

[0008] Furthermore, in the above-mentioned intermediate cylinder axial limiting device for a forklift mast, the first limiting groove includes a first arcuate surface and a second arcuate surface transitionally connected to each other, the first arcuate surface matches the first shaft segment, and the second arcuate surface matches the second shaft segment.

[0009] Furthermore, in the above-mentioned intermediate cylinder axial limiting device for a forklift mast, the second limiting groove is symmetrically arranged with respect to the first limiting groove, and the second limiting groove includes the first arcuate surface and the second arcuate surface which are transitionally connected to each other, the first arcuate surface matches the first shaft segment, and the second arcuate surface matches the second shaft segment.

[0010] As a specific embodiment, in the above-mentioned intermediate cylinder axial limiting device for a forklift mast, two second fixing holes are formed through the second limiting plate, and two first fixing holes matching the second fixing holes are formed on the first limiting plate. The fastener is meshedly connected with the first fixing hole and the second fixing hole, and the fastener passes through the second fixing hole in turn and is screwed into the corresponding first fixing hole.

[0011] As a specific implementation, in the above-mentioned intermediate cylinder axial limiting device for a forklift mast, the fastener is a fastening bolt.

[0012] On the other hand, the present invention further provides a forklift mast, which includes the above-mentioned intermediate cylinder axial limiting device.

[0013] The forklift mast and the intermediate cylinder axial limiting device of the present invention have the following advantages and positive effects:

[0014] The present invention has a simple structure and is easy to assemble and disassemble. Through the cooperation between the first limit plate, the second limit plate and the limit block, the axial displacement of the intermediate cylinder is effectively limited, thereby significantly reducing the shaking of the cargo. For some high-lift forklift door frames, the stability and operational safety under heavy-load conditions are improved, and the invention has good practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings in the following descriptions are only used to further understand the embodiments of the present invention and constitute a part of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0016] Figure 1 This is a diagram of the use state of the intermediate cylinder axial limiting device for a forklift mast of the present invention;

[0017] Figure 2 It is a structural schematic diagram of an intermediate cylinder axial limiting device for a forklift mast of the present invention;

[0018] Figure 3 yes Figure 2 A partial enlarged view of middle Ⅰ;

[0019] Figure 4 It is a top view of the intermediate cylinder axial limiting device for a forklift mast of the present invention;

[0020] Figure 5 It is a structural schematic diagram of the first step in the axial limiting device of the intermediate cylinder for a forklift door frame of the present invention.

[0021] Description of reference numerals:

[0022] 1-gantry, 2-middle cylinder, 3-guard plate, 4-first limit plate, 41-first step, 5-second limit plate, 51-second step, 6-limit block. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding 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 work are within the scope of protection of the present invention.

[0024] like Figures 1 to 5 As shown, the present invention provides a forklift door frame and an axial limiting device for its intermediate cylinder.

[0025] On the one hand, the present invention discloses an intermediate cylinder axial limiting device for a forklift gantry, wherein the intermediate cylinder axial limiting device is arranged between a gantry 1 and an intermediate cylinder 2, a guard plate 3 is connected to the middle part of the gantry 1 by fasteners, and the intermediate cylinder 2 is arranged between the guard plate 3 and the gantry 1, and the radial position of the intermediate cylinder 2 can be effectively limited by the guard plate 3, and the intermediate cylinder 2 axial limiting device comprises a first limiting plate 4 arranged at the lower side of the gantry 1, and a second limiting plate 5 correspondingly arranged at one side of the first limiting plate 4 by fasteners, a first limiting groove is provided on the end face of the first limiting plate 4, and a second limiting groove is provided on the end face of the second limiting plate 5, and the first limiting groove and the second limiting groove are arranged corresponding to each other, a limiting block 6 is provided at the bottom of the intermediate cylinder 2, and the connection between the limiting block 6 and the intermediate cylinder 2 can be welded, and the limiting block 6 is arranged between the first limiting groove and the second limiting groove, and the axial position of the limiting block 6 can be limited by the first limiting groove and the second limiting groove, thereby limiting the axial position of the intermediate cylinder 2.

[0026] Furthermore, in the intermediate cylinder axial limiting device for a forklift gantry of the present invention, the limiting block 6 includes a first shaft segment and a second shaft segment connected to each other, the axes of the first shaft segment and the second shaft segment coincide with the axis of the intermediate cylinder 2, and the first shaft segment and the second shaft segment are connected in an integrated manner.

[0027] Furthermore, in the intermediate cylinder axial limiting device for a forklift gantry of the present invention, the second shaft section is arranged below the first shaft section, the first shaft section is connected between the second shaft section and the bottom of the intermediate cylinder 2, and the diameter of the second shaft section is greater than the diameter of the first shaft section.

[0028] Furthermore, in the axial limiting device of the intermediate cylinder for a forklift mast of the present invention, the first limiting groove includes a first arcuate surface and a second arcuate surface that are transitionally connected to each other, the first arcuate surface matches the first shaft segment, and the second arcuate surface matches the second shaft segment, and a first step 41 is formed at the transition between the first arcuate surface and the second arcuate surface in the first limiting groove.

[0029] Furthermore, in the axial limiting device of the intermediate cylinder for the forklift mast of the present invention, the second limiting groove is symmetrically arranged with the first limiting groove, and the second limiting groove includes a first arcuate surface and a second arcuate surface that are transitionally connected to each other, the first arcuate surface matches the first shaft segment, and the second arcuate surface matches the second shaft segment, and a second step 51 is formed at the transition between the first arcuate surface and the second arcuate surface in the second limiting groove.

[0030] As a specific embodiment, in the intermediate cylinder axial limiting device for a forklift gantry of the present invention, two second fixing holes are formed through the second limiting plate 5, and two first fixing holes matching the second fixing holes are formed on the first limiting plate 4. The fasteners are meshedly connected with the first fixing holes and the second fixing holes, and the fasteners pass through the second fixing holes in turn and are screwed into the corresponding first fixing holes.

[0031] As a specific implementation, in the intermediate cylinder axial limiting device for a forklift gantry of the present invention, the fastener is a fastening bolt. Of course, other fasteners such as fastening screws and rivets can also be used as long as the fastening effect of the second limiting plate 5 is achieved.

[0032] As a specific embodiment, in the intermediate cylinder axial limiting device for a forklift gantry of the present invention, if it is to be further limited that the intermediate cylinder 2 rotates in the horizontal direction, the second shaft segment can be set to a rectangle or a polygon, and the first limiting groove and the second limiting groove are set accordingly, so that the first limiting groove and the second limiting groove correspond to the shape of the second shaft segment, so as to better limit the horizontal rotation of the intermediate cylinder 2, and simultaneously reduce the gap between the guard plate 3 and the intermediate cylinder 2, thereby increasing the pre-tightening force of the guard plate 3 on the intermediate cylinder 2, so as to achieve a better limiting effect.

[0033] The working principle of the intermediate cylinder axial limiting device for a forklift gantry of the present invention is as follows:

[0034] When the second shaft section is set between the two first curved surfaces, due to gravity, the bottom end of the intermediate cylinder 2 abuts against the top of the first limit plate 4 and the second limit plate 5 at the same time. At this time, there is a gap between the first step, the second step 51 and the inner end surface of the second shaft section. When the gantry 1 is overloaded or lifted to a high position, the intermediate cylinder 2 moves upward due to the cargo and the forklift is in the displacement process. At this time, the inner end surface of the second shaft section rises until it abuts against the first step, the second step 51. This process prevents the intermediate cylinder 2 from moving upward and forms an axial limit for the intermediate cylinder 2.

[0035] On the other hand, the present invention further provides a forklift mast, which includes the above-mentioned intermediate cylinder axial limiting device.

[0036] In summary, compared with the prior art, the forklift mast and the intermediate cylinder axial limiting device of the present invention have the following advantages and positive effects:

[0037] The present invention has a simple structure and is easy to assemble and disassemble. Through the cooperation between the first limit plate 4, the second limit plate 5, and the limit block 6, the axial displacement of the intermediate cylinder 2 is effectively limited, thereby significantly reducing the shaking of the cargo. For some high-lift forklift masts 1, the stability and operational safety under heavy-load conditions are improved, and the invention has good practicality.

[0038] It should be noted that, in this article, unless otherwise clearly specified and limited, the term "connection" or its synonyms should be understood in a broad sense. For example, "connection" can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. Moreover, expressions such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. At the same time, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such a process, method, article or device. In addition, "front", "back", "left", "right", "upper" and "lower" in this article are all referenced to the placement state shown in the accompanying drawings.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An intermediate cylinder axial limit device for a forklift mast, wherein the intermediate cylinder axial limit device is arranged between the mast and the intermediate cylinder, a guard plate is connected to the middle of the mast through a fastener, and the intermediate cylinder is arranged between the guard plate and the mast, characterized in that: The axial limiting device of the intermediate cylinder includes a first limiting plate arranged at the lower side of the door frame, and a second limiting plate arranged on one side of the first limiting plate through the fastener. The end surface of the first limiting plate is provided with a first limiting groove, and the end surface of the second limiting plate is provided with a second limiting groove. The first limiting groove and the second limiting groove are arranged corresponding to each other. A limiting block is provided at the bottom of the intermediate cylinder, and the limiting block is arranged between the first limiting groove and the second limiting groove. The axial position of the limiting block can be limited by the first limiting groove and the second limiting groove.

2. The intermediate cylinder axial limiting device for a forklift mast according to claim 1, characterized in that: The limit block includes a first shaft segment and a second shaft segment connected to each other, and the axes of the first shaft segment and the second shaft segment coincide with the axis of the intermediate cylinder.

3. The intermediate cylinder axial limiting device for a forklift mast according to claim 2, characterized in that: The second shaft section is arranged below the first shaft section, the first shaft section is connected between the second shaft section and the bottom of the intermediate cylinder, and the diameter of the second shaft section is greater than the diameter of the first shaft section.

4. The intermediate cylinder axial limiting device for a forklift mast according to claim 2, characterized in that: The first limiting groove includes a first arcuate surface and a second arcuate surface which are transitionally connected to each other, the first arcuate surface matches the first shaft segment, and the second arcuate surface matches the second shaft segment.

5. The intermediate cylinder axial limiting device for a forklift mast according to claim 2, characterized in that: The second limiting groove is symmetrically arranged with respect to the first limiting groove, and the second limiting groove includes the first arcuate surface and the second arcuate surface which are transitionally connected to each other, the first arcuate surface matches the first shaft segment, and the second arcuate surface matches the second shaft segment.

6. The intermediate cylinder axial limiting device for a forklift mast according to claim 1, characterized in that: The second limiting plate is provided with two second fixing holes, the first limiting plate is provided with two first fixing holes matching the second fixing holes, the fastener is meshedly connected with the first fixing hole and the second fixing hole, and the fastener passes through the second fixing hole in turn and is screwed into the corresponding first fixing hole.

7. The intermediate cylinder axial limiting device for a forklift mast according to claim 1, characterized in that: The fastener is a fastening bolt.

8. A forklift mast, characterized in that: The forklift mast comprises the intermediate cylinder axial limiting device according to any one of claims 1-7.

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