Lifting oil way structure of forklift mast

Abstract

The utility model relates to the technical field of forklifts, and particularly discloses a forklift portal frame lifting oil way structure which comprises a hydraulic driving unit, a pump motor, a gear pump and an oil tank, a portal frame comprises an outer portal frame and a movable portal frame arranged on the outer portal frame in a lifting mode, and the lower end of the hydraulic driving unit is fixed to the bottom of the front side of a forklift body. The pump motor is arranged in the vehicle body in the vertical direction, the gear pump is located at the bottom of the pump motor, an oil outlet of the gear pump communicates with the hydraulic driving unit through a first oil pipe, an oil inlet of the gear pump communicates with the oil tank through an oil suction pipe, and therefore the gear pump can suck hydraulic oil in the oil tank through the oil suction pipe; due to the fact that the pump motor is arranged in the vertical direction, the transverse occupied size of the pump motor is small, arrangement of the oil tank cannot be affected, the gear pump is located at the bottom of the pump motor and is close to the bottom of the hydraulic driving unit, the length of the first oil pipe is required to be short, and cost is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of forklifts, in particular to a forklift door frame lifting oil circuit structure. Background Art

[0002] In order to increase the forking range of the fork, the gantry is generally set as a three-stage gantry, which can maximize its movement height. In order to achieve the lifting of the gantry, it is usually achieved through a lifting cylinder, and the hydraulic oil required for the lifting cylinder is driven by the pump motor to drive the hydraulic pump to work, and the hydraulic oil in the oil tank is transported to the lifting cylinder.

[0003] However, in the prior art, the pump motor is usually arranged horizontally, which causes it to occupy a larger volume in the horizontal direction. Therefore, the layout area of ​​the oil tank is limited, the oil tank volume is small or a special-shaped oil cylinder is set. At the same time, since the hydraulic pump needs to be connected to the pump motor, it will cause the distance between the hydraulic pump and the lifting cylinder to be far, and the oil pipe needs to be longer. Utility Model Content

[0004] The present utility model is made in consideration of the aforementioned problems. The purpose of the utility model is to provide a forklift mast lifting oil circuit structure. By arranging the pump motor vertically, its lateral occupied volume is reduced, and the size restriction of the oil tank is reduced. At the same time, the gear pump is closer to the lifting cylinder, which can shorten the length of the oil pipe between the gear pump and the lifting cylinder.

[0005] To achieve the above-mentioned purpose, the utility model provides a forklift gantry lifting oil circuit structure, the forklift also includes a body, the gantry is arranged at the front side of the body, the gantry includes an outer gantry and a movable gantry that can be lifted and lowered on the outer gantry, the lifting oil circuit structure includes a hydraulic drive unit, a pump motor, a gear pump and an oil tank, the lower end of the hydraulic drive unit is fixed to the bottom of the front side of the body, and is used to drive the movable gantry to perform lifting and lowering movements, the oil tank, the gear pump and the pump motor are all located in the body, the pump motor is arranged in the body along the vertical direction, and the gear pump is located at the bottom of the pump motor;

[0006] The oil outlet of the gear pump is communicated with the hydraulic drive unit through a first oil pipe, and the oil inlet of the gear pump is communicated with the oil tank through an oil suction pipe.

[0007] According to the forklift mast lifting oil circuit structure described above, it also includes a hydraulic valve plate, the oil outlet of the gear pump is connected to the oil inlet of the hydraulic valve plate through the first oil pipe, and the oil outlet of the hydraulic valve plate is connected to the hydraulic drive unit.

[0008] According to the forklift mast lifting oil circuit structure described above, an oil return port is provided on the hydraulic valve plate, and the oil return port is connected to the oil tank through an oil return pipe.

[0009] According to the above-mentioned forklift mast lifting oil circuit structure, the movable mast includes a middle mast and an inner mast, the middle mast is liftably arranged on the outer mast, and the inner mast is liftably arranged on the middle mast, the hydraulic drive unit includes a first lifting cylinder and a second lifting cylinder, the first lifting cylinder is connected to the middle mast and is used to drive the middle mast to perform lifting movements, and the second lifting cylinder is connected to the inner mast and is used to drive the inner mast to perform lifting movements.

[0010] According to the forklift mast lifting oil circuit structure described above, the hydraulic valve plate is connected to the first lifting cylinder and the second lifting cylinder at the same time.

[0011] The utility model has the following beneficial effects: the pump motor is arranged in the vehicle body along the vertical direction, which can reduce the laterally occupied volume and avoid limiting the oil tank volume; at the same time, since the gear is installed at the bottom of the pump motor, the distance between it and the bottom of the hydraulic drive unit is shorter, so the required first oil pipe length is shorter, saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 2. It is a schematic diagram of the overall structure of a forklift of an embodiment;

[0013] Figure 2 It is a schematic diagram of the lifting oil circuit structure of an embodiment.

[0014] In the figure:

[0015] 1. Pump motor; 2. Gear pump; 3. Oil tank; 4. First oil pipe; 5. Oil suction pipe; 6. Oil return pipe; 7. First lifting cylinder; 8. Second lifting cylinder; 9. Outer mast; 10. Middle mast; 11. Inner mast; 12. Vehicle body. DETAILED DESCRIPTION

[0016] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0017] like Figure 1-2As shown, a forklift mast lifting oil circuit structure includes a hydraulic drive unit, a pump motor 1, a gear pump 2 and an oil tank 3. The forklift also includes a body 12. The mast is arranged at the front side of the body 12. The fork is generally fixed to the mast in a manner that it can be lifted or lowered. In order to increase the lifting height of the fork, the mast includes an outer mast 9 and a movable mast that can be lifted or lowered on the outer mast 9. The fork is fixed to the movable mast in a manner that it can be lifted or lowered. The lower end of the hydraulic drive unit is fixed to the bottom of the front side of the body 12 and is used to drive the movable mast to perform lifting movements. The oil tank 3, the gear pump 2 and the pump motor 1 are all located in the body 12. The motor 1 is arranged in the vehicle body 12 along the vertical direction, the gear pump 2 is located at the bottom of the pump motor 1, the oil outlet of the gear pump 2 is connected to the hydraulic drive unit through the first oil pipe 4, and the oil inlet of the gear pump 2 is connected to the oil tank 3 through the oil suction pipe 5. The gear pump 2 can absorb the hydraulic oil in the oil tank 3 through the oil suction pipe 5 and transmit it to the hydraulic drive unit. Since the pump motor 1 is arranged in the vertical direction, its lateral occupied volume is small and will not affect the arrangement of the oil tank 3. The gear pump 2 is located at the bottom of the pump motor 1, close to the bottom of the hydraulic drive unit, and the length requirement of the first oil pipe 4 is short, saving costs.

[0018] In order to allocate the hydraulic oil to each hydraulic component, a hydraulic valve plate is also included. The oil outlet of the gear pump 2 is connected with the oil inlet of the hydraulic valve plate through the first oil pipe 4, and the oil outlet of the hydraulic valve plate is connected with the hydraulic drive unit. The gear pump 2 transports the hydraulic oil to the hydraulic valve plate, and then distributes the pressure oil through the hydraulic valve plate. Then, according to specific needs, it is distributed to each hydraulic component. At the same time, an oil return port is provided on the hydraulic valve plate, and the oil return port is connected with the oil tank 3 through the oil return pipe 6. The return oil of each hydraulic component is uniformly returned to the oil tank 3 through the hydraulic valve plate.

[0019] Specifically, the movable mast includes a middle mast 10 and an inner mast 11. The middle mast 10 can be raised and lowered on the outer mast 9, and the inner mast 11 can be raised and lowered on the middle mast 10. The hydraulic drive unit includes a first lifting cylinder 7 and a second lifting cylinder 8. The first lifting cylinder 7 is connected to the middle mast 10 and is used to drive the middle mast 10 to perform lifting movements. The second lifting cylinder 8 is connected to the inner mast 11 and is used to drive the inner mast 11 to perform lifting movements. The hydraulic valve plate is connected to the first lifting cylinder 7 and the second lifting cylinder 8 at the same time, so the hydraulic valve plate can control the actions of the first lifting cylinder 7 and the second lifting cylinder 8 at the same time.

[0020] The technical solution of the utility model is described in detail above in conjunction with the accompanying drawings, and the described embodiments are used to help understand the idea of ​​the utility model. The specific embodiments described herein are merely examples of the spirit of the utility model. A person skilled in the art of the utility model may make various modifications or supplements to the described specific embodiments or replace them in a similar manner, but this will not deviate from the spirit of the utility model or exceed the scope defined by the attached claims.

[0021] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0022] In addition, in the present invention, the descriptions of "first", "second", "one", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0023] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

Claims

1. A forklift mast lifting oil circuit structure, the forklift also includes a body, the mast is arranged at the front side of the body, the mast includes an outer mast and a movable mast that can be lifted and lowered on the outer mast, characterized in that: The lifting oil circuit structure includes a hydraulic drive unit, a pump motor, a gear pump and an oil tank. The lower end of the hydraulic drive unit is fixed to the bottom of the front side of the vehicle body and is used to drive the movable mast to perform lifting and lowering movements. The oil tank, the gear pump and the pump motor are all located inside the vehicle body. The pump motor is arranged inside the vehicle body in a vertical direction, and the gear pump is located at the bottom of the pump motor. The oil outlet of the gear pump is communicated with the hydraulic drive unit through a first oil pipe, and the oil inlet of the gear pump is communicated with the oil tank through an oil suction pipe.

2. A forklift mast lifting oil circuit structure according to claim 1, characterized in that: It also includes a hydraulic valve plate, the oil outlet of the gear pump is connected to the oil inlet of the hydraulic valve plate through the first oil pipe, and the oil outlet of the hydraulic valve plate is connected to the hydraulic drive unit.

3. The forklift mast lifting oil circuit structure according to claim 2, characterized in that: The hydraulic valve plate is provided with an oil return port, and the oil return port is communicated with the oil tank through an oil return pipe.

4. The forklift mast lifting oil circuit structure according to claim 2, characterized in that: The movable mast includes a middle mast and an inner mast, the middle mast is liftably arranged on the outer mast, and the inner mast is liftably arranged on the middle mast, the hydraulic drive unit includes a first lifting cylinder and a second lifting cylinder, the first lifting cylinder is connected to the middle mast and is used to drive the middle mast to perform lifting movements, the second lifting cylinder is connected to the inner mast and is used to drive the inner mast to perform lifting movements.

5. The forklift mast lifting oil circuit structure according to claim 4, characterized in that: The hydraulic valve plate is communicated with the first lifting cylinder and the second lifting cylinder at the same time.

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