Forklift mast and intermediate cylinder axial limiting device

Abstract

The application discloses a forklift mast and an intermediate cylinder axial limiting device thereof. The intermediate cylinder axial limiting device comprises a first limiting plate arranged below one side of the mast, a second limiting plate arranged on one side of the first limiting plate through fasteners, a first limiting groove is arranged on the end face of the first limiting plate, a second limiting groove is arranged on the end face of the second limiting plate, the first limiting groove and the second limiting groove are arranged correspondingly, a limiting block is arranged at the bottom of the intermediate cylinder 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 application has the advantages of simple structure, convenient disassembly and assembly, effective limitation of the axial displacement of the intermediate cylinder through the cooperation between the first limiting plate, the second limiting plate and the limiting block, significant reduction of goods shaking, improvement of the stability and operation safety of some high-lifting forklift masts under heavy load working conditions, and good practicability.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of forklift mast, and particularly relates to a forklift mast and an intermediate cylinder axial limiting device thereof. BACKGROUND

[0002] The forklift mast is the main load-bearing structure of the forklift device, and is also called a mast, which is composed of an inner mast, an outer mast, a fork frame, a fork, a chain wheel, a chain, 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 sleeved with each other, the cylinder barrel is fixed to the outer mast, and the upper end of the piston rod is fixed to the chain wheel mechanism.

[0003] In the prior art, the middle part of the intermediate cylinder is fixed to the mast by a guard plate, the guard plate and the mast are provided with threaded holes corresponding to each other, the intermediate cylinder is fixed by the engagement between the fasteners and the threaded holes, a support plate is arranged below one side of the mast, a through hole is formed in the support plate, a pin shaft is arranged at the bottom of the intermediate cylinder and is inserted into the through hole. However, the guard plate and the pin shaft can only limit the intermediate cylinder in the radial direction. For some high-lift forklift masts, under heavy load conditions, the goods may jump or shake, which seriously affects the overall operation stability and safety of the forklift. Therefore, there is an urgent need for a forklift mast and an intermediate cylinder axial limiting device thereof. SUMMARY

[0004] To solve the above-mentioned technical problems in the prior art, the present application provides a forklift mast and an intermediate cylinder axial limiting device thereof.

[0005] In one aspect, the present application provides an intermediate cylinder axial limiting device for a forklift mast, which is arranged between the mast and the intermediate cylinder, the middle part of the mast is connected with a guard plate through fasteners, and the intermediate cylinder is arranged between the guard plate and the mast. The intermediate cylinder axial limiting device comprises a first limiting plate arranged below one side of the mast, a second limiting plate arranged on one side of the first limiting plate through the fasteners, a first limiting groove formed in the end face of the first limiting plate, a second limiting groove formed in the end face of the second limiting plate, and a limiting block 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.

[0006] Further, 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 which are connected with each other, and the shaft lines of the first shaft segment and the second shaft segment coincide with the axis line of the intermediate cylinder.

[0007] Further, in the intermediate cylinder axial limiting device for the forklift mast, 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 that of the first shaft section.

[0008] Further, in the intermediate cylinder axial limiting device for the forklift mast, the first limiting groove comprises a first arc surface and a second arc surface which are connected to each other in transition, the first arc surface is matched with the first shaft section, and the second arc surface is matched with the second shaft section.

[0009] Further, in the intermediate cylinder axial limiting device for the forklift mast, the second limiting groove is symmetrically arranged with the first limiting groove, the second limiting groove comprises the first arc surface and the second arc surface which are connected to each other in transition, the first arc surface is matched with the first shaft section, and the second arc surface is matched with the second shaft section.

[0010] As a specific embodiment, in the intermediate cylinder axial limiting device for the forklift mast, two second fixing holes are arranged through the second limiting plate, two first fixing holes matched with the second fixing holes are arranged on the first limiting plate, the fastener is in meshing connection with the first fixing hole and the second fixing hole, and the fastener is sequentially threaded into the corresponding first fixing hole after passing through the second fixing hole.

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

[0012] On the other hand, the application further provides a forklift mast comprising the intermediate cylinder axial limiting device.

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

[0014] The application has the advantages of simple structure, convenient disassembly and assembly, effective limitation of the axial displacement of the intermediate cylinder through the cooperation of the first limiting plate, the second limiting plate and the limiting block, and significant reduction of the shaking of goods, improvement of the stability and operation safety of some high-lift forklift masts under heavy load working conditions, and good practicability. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only used to further understand the present application and form a part of the present application. Other drawings can be obtained by those skilled in the art without creative effort based on these drawings.

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

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

[0018] Figure 3 is Figure 2 a partial enlarged view of the intermediate cylinder axial limiting device for the forklift mast of the present application;

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

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

[0021] Explanation of reference signs:

[0022] 1-mast, 2-intermediate cylinder, 3-guard plate, 4-first limiting plate, 41-first step, 5-second limiting plate, 51-second step, 6-limiting block. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the present application more clear, the following will combine the specific embodiments of the present application and the corresponding drawings to clearly and completely describe the technical solutions of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative effort belong to the scope of protection of the present application.

[0024] As Figures 1 to 5 shown, the present application provides a forklift mast and an intermediate cylinder axial limiting device thereof.

[0025] The application discloses a kind of intermediate cylinder axial limiting device for fork truck portal, and intermediate cylinder axial limiting device is arranged between portal 1 and intermediate cylinder 2, the middle part of portal 1 is connected with guard plate 3 by fastener, and intermediate cylinder 2 is arranged between guard plate 3 and portal 1, the radial position of intermediate cylinder 2 can be effectively limited by guard plate 3, and intermediate cylinder axial limiting device includes the first limiting plate 4 being arranged below one side of portal 1, the second limiting plate 5 being correspondingly arranged on one side of the first limiting plate 4 by fastener, the first limiting groove is opened in the end surface of the first limiting plate 4, the second limiting groove is opened in the end surface of the second limiting plate 5, and the first limiting groove and the second limiting groove are correspondingly arranged between each other, the limiting block 6 is opened in the bottom of intermediate cylinder 2, the connecting mode between limiting block 6 and intermediate cylinder 2 can adopt welding, limiting block 6 is arranged between the first limiting groove and the second limiting groove, the axial position of limiting block 6 can be limited by the first limiting groove and the second limiting groove, and then the axial position of intermediate cylinder 2 is limited.

[0026] Further, in the intermediate cylinder axial limiting device for fork truck portal of the application, the limiting block 6 includes the first shaft section and the second shaft section connected with each other, the axes of the first shaft section and the second shaft section coincide with the axis of the intermediate cylinder 2, and the first shaft section and the second shaft section are integrally connected.

[0027] Further, in the intermediate cylinder axial limiting device for fork truck portal of the application, 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 that of the first shaft section.

[0028] Further, in the intermediate cylinder axial limiting device for fork truck portal of the application, the first limiting groove includes the first arc surface and the second arc surface connected with each other, the first arc surface matches the first shaft section, the second arc surface matches the second shaft section, and the transition between the first arc surface and the second arc surface in the first limiting groove forms the first step 41.

[0029] Further, in the intermediate cylinder axial limiting device for fork truck portal of the application, the second limiting groove and the first limiting groove are symmetrically arranged, the second limiting groove includes the first arc surface and the second arc surface connected with each other, the first arc surface matches the first shaft section, the second arc surface matches the second shaft section, and the transition between the first arc surface and the second arc surface in the second limiting groove forms the second step 51.

[0030] As a specific embodiment, in the intermediate cylinder axial limiting device for fork truck portal of the application, two second fixing holes are opened through the second limiting plate 5, two first fixing holes matching the second fixing holes are opened on the first limiting plate 4, the fastener is meshingly connected between the first fixing hole and the second fixing hole, and the fastener is sequentially threaded through the second fixing hole and then screwed into the corresponding first fixing hole.

[0031] As a specific embodiment, in the intermediate cylinder axial limiting device for the forklift mast of the application, the fastener is a fastening bolt, of course, other fasteners such as fastening screws, rivets, etc. can also be used as long as the fastening effect on the second limiting plate 5 is achieved.

[0032] As a specific embodiment, in the intermediate cylinder axial limiting device for the forklift mast of the application, if the rotation of the intermediate cylinder 2 in the horizontal direction is to be further limited, the second shaft section can be set to a rectangle or a polygon, and the first limiting groove and the second limiting groove are correspondingly set, so that the first limiting groove and the second limiting groove correspond to the shape of the second shaft section, better limiting the horizontal rotation of the intermediate cylinder 2, and simultaneously reducing the gap between the guard plate 3 and the intermediate cylinder 2, improving the pre-tightening force of the guard plate 3 on the intermediate cylinder 2, to achieve a better limiting effect.

[0033] The working principle of the intermediate cylinder axial limiting device for the forklift mast of the application is as follows:

[0034] When the second shaft section is arranged between the two first arc-shaped surfaces, due to gravity, the bottom end of the intermediate cylinder 2 simultaneously abuts against the top end of the first limiting plate 4 and the second limiting plate 5, 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 mast 1 is heavily loaded or lifted to a high position, due to the load of the goods and the displacement process of the forklift, the intermediate cylinder 2 is displaced upward, at this time, the inner end surface of the second shaft section rises until abutting against the first step and the second step 51, this process prevents the upward displacement of the intermediate cylinder 2, forming axial limiting of the intermediate cylinder 2.

[0035] On the other hand, the application also provides a forklift mast, which comprises 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 thereof of the application have the following advantages and positive effects:

[0037] The application has the advantages of simple structure, convenient disassembly and assembly, effective limiting of the axial displacement of the intermediate cylinder 2 through the cooperation between the first limiting plate 4, the second limiting plate 5 and the limiting block 6, and significant reduction of the goods shaking, which improves the stability and operation safety of the high-lift forklift mast 1 under heavy load working conditions, and has good practicability.

[0038] It should be noted that, in this article, unless otherwise specified and limited, the term "connection" or its synonyms should be understood broadly, for example, "connection" can be fixed connection, can also be detachable connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through intermediate medium, can be internal communication of two elements or interaction relationship of two elements, and those skilled in the art can understand the specific meaning of the above-mentioned term in the present application 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 the entities or operations. At the same time, the term "includes", "contains" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or equipment. In addition, "front", "back", "left", "right", "up", "down" in this article are referred to the placement state shown in the drawings.

[0039] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit it; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A middle cylinder axial limiting device for a forklift mast, the middle cylinder axial limiting device is arranged between a mast and a middle cylinder, a middle part of the mast is connected with a guard plate through a fastener, and the middle cylinder is arranged between the guard plate and the mast, characterized in that, The intermediate cylinder axial limiting device comprises a first limiting plate arranged below one side of the portal frame, a second limiting plate arranged on one side of the first limiting plate through the fastener, a first limiting groove is arranged on the end face of the first limiting plate, a second limiting groove is arranged 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 arranged on the bottom of the intermediate cylinder 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.

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

3. The intermediate cylinder axial stop 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 that of the first shaft section.

4. The intermediate cylinder axial stop device for a forklift mast according to claim 2, characterized in that, The first limiting groove comprises a first arc surface and a second arc surface connected to each other, the first arc surface matches the first shaft section, and the second arc surface matches the second shaft section.

5. The intermediate cylinder axial stop device for a forklift mast according to claim 2, characterized in that, The second limiting groove and the first limiting groove are symmetrically arranged, the second limiting groove comprises a first arc surface and a second arc surface connected to each other, the first arc surface matches the first shaft section, and the second arc surface matches the second shaft section.

6. The intermediate cylinder axial stop for a forklift mast according to claim 1, wherein, Two second fixing holes are arranged through the second limiting plate, two first fixing holes matching the second fixing holes are arranged on the first limiting plate, the fastener is engaged with the first fixing hole and the second fixing hole, the fastener is sequentially threaded through the second fixing hole and then screwed into the corresponding first fixing hole.

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

8. A fork lift mast characterized by, The forklift portal frame comprises the intermediate cylinder axial limiting device of any one of claims 1-7.

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