Forklift drive and lift control oil circuit system

Abstract

The utility model relates to a fork truck control technical field, concretely provides a fork truck drive lift control oil circuit system, including inverted L type structure support, the side end of support is equipped with oil pump, is equipped with lifting cylinder in upper end, the support is opened in and simultaneously penetrates the upper oil passage and oil return passage of upper end and side end of support, the oil return passage is connected with the oil return pipeline and is inserted, and the upper end of oil return pipeline is connected to the side of lifting cylinder close to the upper end, the utility model discloses the built -in hidden design of hydraulic pipeline, carries out the protection design to oil return pipeline, realizes the thorough innovation of fork truck drive system oil circuit layout, can fundamentally eliminate the damage and leakage risk of pipeline because of external collision, scraping and environmental erosion, significantly improves the operation safety and reliability of system, still optimizes the space utilization through the high integration design, makes the structure more compact.

Description

Technical Field

[0001] This utility model relates to the field of forklift control technology, specifically to a forklift drive lifting control hydraulic circuit system. Background Technology

[0002] Forklifts are common industrial handling vehicles. Their core function is to lift and lower goods by driving the mast through a hydraulic system. Traditional forklift lifting hydraulic drive systems typically include an oil pump, a multi-way directional valve, a hydraulic cylinder, and hydraulic oil pipes connecting them. For example, a published Chinese patent, publication number CN201670690U, discloses a novel forklift structure, including a forklift body (1), a lifting frame (2), a controller (4), and forks (8). The lifting frame (2) is connected to the forklift body (1) through a connecting plate (15). The upper end (3) of the lifting frame (2) is set as an outwardly protruding structure. A hydraulic cylinder (5) is connected to the upper end (3) of the lifting frame. A piston structure (16) is set at the end of the forks (8). The piston structure (16) is installed in the hydraulic cylinder (5). The hydraulic cylinder (5) is connected to a hydraulic oil pump (9). The hydraulic oil pump (9) is connected to the controller (4) for starting and stopping the controller.

[0003] In existing technologies, the hydraulic hoses connecting the oil pump and the lifting cylinder are mostly exposed on the outside of the forklift body or the side of the mast, or some measures are taken, such as simply binding and fixing the hoses to the inside of the mast. These external layouts have the following obvious drawbacks: First, poor safety. When the forklift is operating, especially when moving through narrow aisles or dense racks, the exposed hoses are very likely to collide or scratch with goods, racks or other obstacles, resulting in hose damage and hydraulic oil leakage. This not only causes system failure, but may also cause fire hazards and environmental pollution. Second, low reliability. The hoses are exposed to harsh working environments for a long time and are susceptible to corrosion from dust, moisture and corrosive substances, which accelerates aging and shortens service life. Third, the exposed hoses make the overall layout of the vehicle look cluttered, occupy valuable external space of the vehicle body, and are not conducive to the compact design of the forklift structure. Utility Model Content

[0004] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a forklift drive lifting control hydraulic circuit system to solve the problems of poor safety, low reliability and messy layout of external hydraulic oil pipes in the prior art.

[0005] To achieve the above and other related objectives, this utility model provides a forklift drive lifting control hydraulic circuit system, including an inverted L-shaped bracket, an oil pump is installed on the side end of the bracket, and a lifting cylinder is installed on the upper end of the bracket; The bracket is provided with an upper and lower oil channel that runs through both the upper end and the side end of the bracket. The upper end of the upper and lower oil channel is connected to the oil inlet of the lifting cylinder and the lower end is connected to the oil outlet of the oil pump. The bracket is also provided with an oil return channel that runs through both the upper end and the side end of the bracket. The lower end of the oil return channel is connected to the oil inlet of the oil pump. An oil return pipe is passed through the oil return channel, and the upper end of the oil return pipe is connected to the side of the lifting cylinder near the upper end.

[0006] In one embodiment of the present invention, the lifting cylinder includes a cylinder body and a plunger that is movable and height-adjustable within the cylinder body, and the upper end of the upper and lower oil channels is connected to the interior of the cylinder body.

[0007] In one embodiment of the present invention, a clearance groove for avoiding the routing of the return oil pipeline is provided on one side of the lower end of the cylinder body corresponding to the upper side of the return oil channel.

[0008] In one embodiment of the present invention, a solenoid valve for triggering and limiting the upward stroke of the plunger is provided on the side of the cylinder near the upper end, and the upper end of the return oil line is connected to the solenoid valve.

[0009] In one embodiment of the present invention, the upper end of the bracket is connected to a bearing plate, and the bearing plate is rotatably sleeved on the outer side of the lower end of the cylinder body via a bearing.

[0010] In one embodiment of this utility model, a protective cover is fitted onto the outer side of the upper end of the cylinder.

[0011] As described above, the forklift drive lifting control hydraulic circuit system of this utility model has the following beneficial effects: 1. This utility model, by setting an inverted L-shaped bracket and opening upper and lower oil channels and return oil channels inside the bracket, completely integrates the core hydraulic pipeline, achieving a concealed design effect for the oil circuit. This fundamentally avoids direct contact between the core hydraulic pipeline and the external environment, eliminating the risk of damage caused by collisions and scratches, and greatly improving the operational safety of the forklift lifting drive system and the service life of the hydraulic pipeline. Furthermore, this utility model utilizes the structural space of the bracket body as the oil circuit channel, without occupying additional external space, making the layout of the entire lifting drive system extremely compact and neat, which is conducive to achieving the overall lightweight and compact design of the forklift.

[0012] 2. This utility model, by designing an avoidance groove at the lower end of the cylinder block, can ensure the normal routing of the return oil pipeline. Combined with the design of the support plate and protective cover, it can protect the return oil pipeline. Although the return oil pipeline needs to be threaded through during the initial installation, once the threading is completed, the return oil pipeline can be protected by the bracket, support plate and protective cover in all directions, reducing the frequency of daily maintenance and effectively improving maintenance convenience in the long run.

[0013] 3. This utility model incorporates a built-in concealed design for the hydraulic pipelines and provides protection for the return oil pipelines, achieving a complete revolution in the hydraulic circuit layout of the forklift drive system. This fundamentally eliminates the risk of damage and leakage caused by external collisions, scratches, and environmental corrosion, significantly improving the operational safety and reliability of the system. Furthermore, the highly integrated design optimizes space utilization, making the structure more compact. At the same time, this utility model seamlessly integrates the concealed hydraulic circuits with functions such as lifting and limiting, simplifying external connections and improving overall performance. While achieving a clean and aesthetically pleasing appearance, it also extends the service life and reduces maintenance requirements due to its comprehensive protection of the pipelines. Attached Figure Description

[0014] Figure 1 The diagram shown is an external structural schematic of the forklift drive lifting control hydraulic circuit system disclosed in this utility model.

[0015] Figure 2 The diagram shown is a cross-sectional view of the hydraulic circuit system for driving and lifting a forklift disclosed in this utility model.

[0016] Figure 3 The diagram shown is a partial exploded view of the forklift drive lifting control hydraulic circuit system disclosed in this utility model, with the support plate and protective cover removed.

[0017] Figure 4 Displayed as Figure 3 A schematic diagram of the cross-sectional structure along direction A.

[0018] Figure 5 Displayed as Figure 4 A schematic diagram of the cross-sectional structure along direction B.

[0019] Figure 6 Displayed as Figure 4 A schematic diagram of the cross-sectional structure along the C direction.

[0020] Figure 7 Displayed as Figure 3 A perspective structural diagram.

[0021] Component designation explanation 1. Bracket; 11. Upper and lower oil channels; 12. Oil return channel; 2. Oil pump; 3. Lifting cylinder; 31. Cylinder body; 311. Circumvention groove; 32. Plunger; 4. Oil return pipeline; 5. Bearing plate; 6. Protective cover; 7. Solenoid valve. Detailed Implementation

[0022] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0023] Please see Figures 1 to 7It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of this invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of this invention, should fall within the scope of the disclosed technical content. Furthermore, terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and are not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0024] Please see Figures 1-3 This utility model provides a forklift drive lifting control hydraulic circuit system, including an inverted L-shaped support bracket 1. An oil pump 2 is installed on one side of the support bracket 1, and a drive device is installed on the other side of the support bracket 1. A lifting cylinder 3 is installed on the upper end of the support bracket 1. In actual use, an oil tank and oil reservoir are provided around the oil pump 2. The oil pump 2 has a drive shaft, which is connected to the drive device to drive the hydraulic circuit system.

[0025] Please see Figures 4-7 The bracket 1 is provided with an upper and lower oil passage 11 that runs through both the upper and side ends of the bracket 1. The upper end of the upper and lower oil passage 11 is connected to the oil inlet of the lifting cylinder 3 and the lower end is connected to the oil outlet of the oil pump 2. The bracket 1 is also provided with a return oil passage 12 that runs through both the upper and side ends of the bracket 1. The lower end of the return oil passage 12 is connected to the oil inlet of the oil pump 2. A return oil pipe 4 is passed through the return oil passage 12. The upper end of the return oil pipe 4 is connected to the side of the lifting cylinder 3 near the upper end. This invention, by setting an inverted L-shaped bracket 1 and opening upper and lower oil channels 11 and return oil channels 12 inside the bracket 1, completely integrates the core hydraulic pipeline, achieving a concealed design effect for the oil circuit. This fundamentally avoids direct contact between the core hydraulic pipeline and the external environment, eliminating the risk of damage caused by collisions and scratches, and greatly improving the operational safety of the forklift lifting drive system and the service life of the hydraulic pipeline. Furthermore, this invention utilizes the structural space of the bracket 1 body as the oil circuit channel, without occupying additional external space, making the layout of the entire lifting drive system extremely compact and neat, which is conducive to achieving the overall lightweight and compact design of the forklift.

[0026] The lifting cylinder 3 includes a cylinder body 31 and a plunger 32 that is movable and height-adjustable within the cylinder body 31. The upper end of the upper and lower oil channels 11 is connected to the interior of the cylinder body 31. A clearance groove 311 is provided on one side of the lower end of the cylinder body 31 corresponding to the upper part of the return oil channel 12 to avoid the routing of the return oil pipeline 4. A bearing plate 5 is connected to the upper end of the bracket 1, and the bearing plate 5 is rotatably sleeved on the outer side of the lower end of the cylinder body 31 via a bearing. A protective cover 6 is sleeved on the outer side of the upper end of the cylinder body 31. By designing a clearance groove 311 at the lower end of the cylinder body 31, this utility model can ensure the normal routing of the return oil pipeline 4. Combined with the design of the bearing plate 5 and the protective cover 6, it can provide comprehensive protection for the return oil pipeline 4. Although the return oil pipeline 4 needs to be threaded through the pipe during initial installation, once the pipe is threaded through, the return oil pipeline 4 can be protected by the bracket 1, the bearing plate 5, and the protective cover 6 in all directions, reducing the frequency of daily maintenance and effectively improving maintenance convenience in the long run. The cylinder body 31 is provided with a solenoid valve 7 on the side near the upper end for triggering and limiting the upward stroke of the plunger 32. The upper end of the return oil line 4 is connected to the solenoid valve 7. The return oil line 4 achieves stroke control through the solenoid valve 7. When the plunger 32 moves to the limit position, the limit device is triggered to de-energize the solenoid valve 7. At this time, the return oil line 4 opens, and the hydraulic oil flows back to the oil tank through the return oil line 4, forcing the plunger 32 to stop moving and forming an over-lift protection.

[0027] The working principle of this utility model is as follows: The forklift driver starts the engine or motor, which drives the oil pump 2 to work; the oil pump 2 draws hydraulic oil from the oil tank and pressurizes it into high-pressure oil; the high-pressure oil enters the cylinder body 31 of the lifting cylinder 3 through the upper and lower oil channels 11, generating a huge upward thrust, which acts on the bottom surface of the plunger 32 and pushes the plunger 32 upward; the linear motion of the plunger 32 is amplified and transmitted through the chain pulley system, which ultimately drives the inner mast and forks to rise synchronously, realizing the lifting of goods; when it is necessary to lower the inner mast and forks, the forklift driver stops running the engine or motor, the high-pressure oil slowly retracts along the upper and lower oil channels 11, the plunger 32 gradually falls, and thus the inner mast and forks slowly lower.

[0028] In summary, this utility model, with its built-in concealed hydraulic piping and protective design for the return oil piping, represents a complete revolution in the hydraulic circuit layout of the forklift drive system. It fundamentally eliminates the risk of damage and leakage caused by external collisions, scratches, and environmental corrosion, significantly improving the system's operational safety and reliability. Furthermore, its highly integrated design optimizes space utilization, resulting in a more compact structure. Simultaneously, this design seamlessly integrates concealed hydraulic piping with lifting and limiting functions, simplifying external connections and enhancing overall performance. While achieving a clean and aesthetically pleasing appearance, it also extends the service life of the piping and reduces maintenance requirements due to its comprehensive protection. Therefore, this utility model effectively overcomes the various shortcomings of existing technologies and possesses high industrial application value.

[0029] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A hydraulic control system for lifting and lowering a forklift, characterized in that: It includes an inverted L-shaped support (1), with an oil pump (2) installed on the side end of the support (1) and a lifting cylinder (3) installed on the upper end of the support (1). The bracket (1) is provided with an upper and lower oil channel (11) that simultaneously passes through the upper end and the side end of the bracket (1). The upper end of the upper and lower oil channel (11) is connected to the oil inlet of the lifting cylinder (3), and the lower end is connected to the oil outlet of the oil pump (2). The bracket (1) is also provided with an oil return channel (12) that runs through both the upper end and the side end of the bracket (1). The lower end of the oil return channel (12) is connected to the oil inlet of the oil pump (2). An oil return pipe (4) is connected through the oil return channel (12). The upper end of the oil return pipe (4) is connected to the side of the lifting cylinder (3) near the upper end.

2. The forklift drive lifting control hydraulic circuit system according to claim 1, characterized in that: The lifting cylinder (3) includes a cylinder body (31) and a plunger (32) that can be lifted and moved in the cylinder body (31). The upper end of the upper and lower oil passages (11) is connected to the inside of the cylinder body (31).

3. The forklift drive lifting control hydraulic circuit system according to claim 2, characterized in that: The lower end of the cylinder (31) is provided with a clearance groove (311) on one side above the oil return channel (12) to avoid the routing of the oil return pipeline (4).

4. The forklift drive lifting control hydraulic circuit system according to claim 2, characterized in that: The cylinder (31) is provided with a solenoid valve (7) on the side near the upper end for triggering the limiting plunger (32) to rise. The upper end of the return oil line (4) is connected to the solenoid valve (7).

5. The forklift drive lifting control hydraulic circuit system according to claim 3, characterized in that: The upper end of the bracket (1) is connected to a bearing plate (5), which is rotatably sleeved on the lower outer side of the cylinder (31) via a bearing.

6. The forklift drive lifting control hydraulic circuit system according to claim 3, characterized in that: The upper outer side of the cylinder (31) is fitted with a protective cover (6).

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