Three-stage free portal frame of forklift

Abstract

The utility model discloses a three-stage free portal frame of a forklift. The three-stage free portal frame comprises a fork arm and an oil way system. The fork arm ascends and descends through the oil way system. The oil way system comprises an adjusting assembly used for adjusting the distance between the fork arms, a first lifting assembly used for freely lifting the fork arms, and a second lifting assembly used for lifting of the first lifting assembly. The stable lifting and quick response of the fork arm are realized, and the operation performance is obviously improved; meanwhile, the distance between the fork arms can be flexibly adjusted due to the arrangement of the adjusting assembly; according to the device, a lifting structure and an oil way system are simplified, the structure is compact, disassembly is easy, daily maintenance work is facilitated, and the maintenance cost is effectively reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a three -level free gantry of fork truck belongs to fork truck field. BACKGROUND

[0002] Referring to Figure 7 The prior art discloses the announcement number for: CN221625813U's fork truck three -level gantry pipeline structure, its structure includes three -level gantry, three -level gantry is composed of outer door frame, middle door frame, inner door frame, the inner door frame's inner side wall is fixed with fork carriage, its characterized in that: the lateral wall of outer door frame is fixed with the mounting support symmetry, the lateral wall of mounting support is fixed with tee joint, the top beam lateral wall of middle door frame is installed with first pulley and second pulley symmetry, the lateral wall of inner door frame is installed with front lifting oil cylinder symmetry, the lateral wall of inner door frame and located the rear symmetry fixed mounting of combination support of front lifting oil cylinder, the top of front lifting oil cylinder is fixed with pulley block support, the lateral wall of pulley block support is fixed with third pulley

[0003] But this prior art through the symmetric installation of front lifting oil cylinder and the lifting, wherein front lifting oil cylinder combines complex oil circuit system and pulley assembly to realize three -level lifting, but depends on complex oil circuit system and pulley assembly, this not only increases the maintenance difficulty, also limited the operation flexibility of fork truck. UTILITY MODEL CONTENT

[0004] In view of the deficiencies of the prior art, the utility model aims at providing a three -level free gantry of fork truck to solve the problem.

[0005] In order to realize the above -mentioned purpose, the utility model is through the following technical scheme to realize: a three -level free gantry of fork truck, including fork arm, oil circuit system, the fork arm is based on the oil circuit system and is lifted, the oil circuit system includes the adjusting assembly for adjusting the fork arm spacing, the first lifting assembly for the free lifting of fork arm, the second lifting assembly for the lifting of first lifting assembly,

[0006] The adjusting assembly includes 2 parallelly arranged first hydraulic cylinders, a first support for installing the first hydraulic cylinder, 2 first hydraulic cylinders each act on a fork arm, and the first support is slidingly installed on the first lifting assembly.

[0007] The first lifting assembly includes 2 vertically arranged second hydraulic cylinders and a second support for installing the second hydraulic cylinders, the second hydraulic cylinders drive the first support to lift, and the first support is slidingly installed on the second support.

[0008] The second lifting assembly comprises two third hydraulic cylinders arranged vertically, and a third support rigidly connected with the telescopic shafts of the third hydraulic cylinders; the third hydraulic cylinders drive the second support and the third support to lift; the second support is slidingly installed on the third support;

[0009] The third hydraulic cylinders are fixedly installed on a fourth support;

[0010] The second hydraulic cylinders and the first support, and the third hydraulic cylinders and the second support are connected through a lifting structure.

[0011] Preferably, the lifting structure comprises a roller shaft and a track; the track covers the roller shaft.

[0012] Preferably, the roller shaft is installed on the telescopic shaft of the second hydraulic cylinder; one end of the track is fixed with the second support, and the other end is fixed with the first support.

[0013] Preferably, the roller shaft is installed on the third support; one end of the track is fixed with the fourth support, and the other end is fixed with the second support.

[0014] Preferably, the second hydraulic cylinders are located on both sides of the third support, so that the two lifting structures simultaneously act on the first support.

[0015] Preferably, the third hydraulic cylinders are located on the rear side of the third support, so that the two lifting structures simultaneously act on the second support.

[0016] Preferably, the fourth support is movably connected with the forklift.

[0017] Beneficial effects

[0018] The utility model discloses the stable lifting and quick response of fork arm have been realized, and the operation performance has been improved significantly, simultaneously, the setting of adjusting assembly makes the fork arm distance can be adjusted flexibly. The device simplifies lifting structure and oil circuit system, and its structure is compact and easy to disassemble, which not only facilitates daily maintenance and maintenance work, but also effectively reduces the maintenance cost. BRIEF DESCRIPTION OF DRAWINGS

[0019] Other features, objects and advantages of the utility model will become more apparent through reading the following detailed description of non-restrictive embodiments with reference to the accompanying drawings:

[0020] Figure 1 It is the structure schematic view of the utility model three-dimensional angle one;

[0021] Figure 2 It is the structure schematic view of the utility model three-dimensional angle two;

[0022] Figure 3It is the front view structural schematic drawing of first support and second support of the utility model;

[0023] Figure 4 It is the rear view structural schematic drawing of first support and second support of the utility model;

[0024] Figure 5 It is the structural schematic drawing of second support and third support of the utility model;

[0025] Figure 6 It is the structural schematic drawing of second support, third support, fourth support of the utility model;

[0026] Figure 7 It is the structural schematic drawing of prior art. DETAILED DESCRIPTION

[0027] In order to make the technical means, creative features, purposes and effects of the utility model easy to understand, the utility model is further described below in combination with specific embodiments.

[0028] Please refer to Figures 1-6 The utility model provides a kind of three-stage free gantry technical scheme of fork truck: including fork arm 1, oil circuit system;The fork arm 1 is lifted by relying on the oil circuit system;The oil circuit system includes the adjusting assembly for adjusting the distance between fork arm 1, the first lifting assembly for the free lifting of fork arm 1, the second lifting assembly for the lifting of first lifting assembly, the fourth support D for installing the second lifting assembly;

[0029] The adjusting assembly includes 2 first hydraulic cylinders 2 arranged in parallel, and a first support A for mounting the first hydraulic cylinders 2;Each of the two first hydraulic cylinders 2 acts on one fork arm 1;The first support A is slidingly mounted on the first lifting assembly;

[0030] The first lifting assembly includes two vertically arranged second hydraulic cylinders 4, and a second support B for mounting the second hydraulic cylinders 4;The second hydraulic cylinders 4 drive the first support A to lift;The first support A is slidingly mounted on the second support B;

[0031] The second lifting assembly includes two vertically arranged third hydraulic cylinders 5, and a third support C for mounting the third hydraulic cylinders 5;The third hydraulic cylinders 5 drive the second support B to lift;The second support B is slidingly mounted on the third support C;

[0032] The third hydraulic cylinders 5 are fixedly mounted on the fourth support D;

[0033] The second hydraulic cylinders 4 and the first support A, the third hydraulic cylinders 5 and the second support B are connected by a lifting structure 3.

[0034] Further, the lifting structure 3 comprises a roller 31 and a track 32; the track 32 covers the roller 31. This design makes the connection in a relatively flexible structure, enhances the stability of the lifting process, and reduces the friction loss in the lifting process, prolonging the service life of the equipment.

[0035] Further, the roller 31 is installed on the telescopic shaft of the second hydraulic cylinder 4; one end of the track 32 is fixed with the second support B, and the other end is fixed with the first support A.

[0036] In one embodiment, the second hydraulic cylinder 4 is located on both sides of the third support C, so that the two lifting structures 3 act on the first support A at the same time. The third hydraulic cylinder 5 is located on the rear side of the third support C, so that the two lifting structures 3 act on the second support B at the same time. This layout ensures the stability of the lifting process, and enables the two lifting structures 3 to act on the corresponding support at the same time, improving the lifting efficiency.

[0037] The fourth support D is movably connected with the forklift; in one embodiment, an additional hydraulic cylinder (not shown in the figure) is used to articulate the fourth support D, so as to adjust the angle of the fork arm 1.

[0038] Working principle: when the fork arm 1 needs to be lifted, the second hydraulic cylinder 4 in the first lifting assembly is extended or retracted, driving the first support A and the fork arm 1 installed thereon to lift. At the same time, the third hydraulic cylinder 5 in the second lifting assembly is also extended or retracted, because the third support C is directly connected with the telescopic shaft of the third hydraulic cylinder 5, so that the movement of the third hydraulic cylinder 5 will directly drive the third support C; and one of the rollers 31 is installed on the third support C; one end of the track 32 is fixed with the fourth support D, and the other end is fixed with the second support B, so when the third hydraulic cylinder 5 operates, it will also drive the second support B to move; thereby realizing the three-stage lifting function of the fork arm 1.

[0039] When the distance between the fork arms 1 needs to be adjusted, the first hydraulic cylinder 2 in the adjusting assembly is extended or retracted, which can push or pull the fork arms 1, so as to adjust the distance between the fork arms 1 to adapt to the needs of carrying goods of different sizes.

[0040] During the lifting process, the lifting structure 3 comprising the roller 31 and the track 32 plays a key role, the roller 31 is installed on the telescopic shaft of the hydraulic cylinder (second hydraulic cylinder 4, third hydraulic cylinder 5), and the track 32 serves as a connecting bridge. When the hydraulic cylinder is extended or retracted, the roller 31 rotates, and the track 32 pulls the corresponding support (first support A, second support B), thereby smoothly driving the fork arm 1 to lift.

[0041] The foregoing merely illustrates the principles of the application and application of its leading features. This application is not limited to the illustrative embodiments shown and described herein. Rather, this application is capable of operating within a further range of conditions and environments than those specifically described herein, and further modifications can be made without departing from the spirit or scope of the application. Accordingly, the description is to be construed as illustrative only and not restrictive of the broad disclosure or application of the application. The specification and drawings are, accordingly, to be regarded simply as illustrative and with the scope of the application being measured by the appended claims, and not with the specification. No admission is made that any reference constitutes prior art. It is my intent, therefore, to be limited only as appears in the following claims.

[0042] Furthermore, it should be understood that although the description above relates to embodiments, not every embodiment contains only one independent technical solution, and the description above is only for the sake of clarity, and those skilled in the art should understand the description as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. A three-stage free mast of a forklift truck, comprising a fork arm, an oil circuit system; the fork arm is lifted by the oil circuit system; characterized in that: The hydraulic system includes an adjustment component for adjusting the fork arm spacing, a first lifting component for free lifting of the fork arms, and a second lifting component for lifting the first lifting component. The adjustment assembly includes two parallel first hydraulic cylinders and a first bracket for mounting the first hydraulic cylinders; each of the two first hydraulic cylinders acts on one of the fork arms; the first bracket is slidably mounted on the first lifting assembly; The first lifting assembly includes two vertically arranged second hydraulic cylinders and a second bracket for mounting the second hydraulic cylinders; the second hydraulic cylinders drive the first bracket to rise and fall; the first bracket is slidably mounted on the second bracket. The second lifting assembly includes two vertically arranged third hydraulic cylinders and a third bracket rigidly connected to the telescopic shaft of the third hydraulic cylinders; the third hydraulic cylinders drive the second bracket and the third bracket to rise and fall; the second bracket is slidably mounted on the third bracket; The third hydraulic cylinder is fixedly mounted on the fourth bracket; The second hydraulic cylinder is connected to the first bracket, and the third hydraulic cylinder is connected to the second bracket via a lifting structure.

2. The three-stage free mast of a forklift according to claim 1, characterized in that: The lifting structure includes rollers and tracks; the tracks cover the rollers.

3. The three-stage free mast of a forklift according to claim 2, characterized in that: The roller is mounted on the telescopic shaft of the second hydraulic cylinder; one end of the track is fixed to the second bracket, and the other end is fixed to the first bracket.

4. The three-stage free mast of a forklift according to claim 2, characterized in that: The roller is mounted on the third bracket; one end of the track is fixed to the fourth bracket, and the other end is fixed to the second bracket.

5. The three-stage free mast of a forklift according to claim 3, characterized in that: The second hydraulic cylinder is located on both sides of the third support, so that the two lifting structures act on the first support simultaneously.

6. The three-stage free mast of a forklift according to claim 4, characterized in that: The third hydraulic cylinder is located behind the third support, so that the two lifting structures act on the second support simultaneously.

7. The three-stage free mast of a forklift according to claim 1, characterized in that: The fourth bracket is movably connected to the forklift.

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