Man-type three-way forklift hydraulic system
By integrating the auxiliary valve block and guide wheel adjustment mechanism into the hydraulic system of a manned three-way forklift, the problem of a large number of oil circuits and easy failures caused by wear is solved, safety and reliability are improved, and stable storage and retrieval of goods in narrow aisle environments is ensured.
Patent Information
- Application Number
- CN202511065055.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-31
- Publication Date
- 2025-09-19
AI Technical Summary
Existing manned three-way forklifts have many oil and circuit pipes, which are difficult to lay out. They are also prone to wear and tear during use, have a high failure rate, and pose a safety hazard.
A hydraulic system for a manned three-way forklift is designed. The system is integrated into the cab through an auxiliary valve block to form a closed circuit, reducing the number of oil and circuit pipes on the main mast. Guide wheels and adjustment mechanisms are also installed on the linkage frame to prevent wear and tipping.
It effectively reduces the cost and difficulty of pipeline laying, reduces wear and failure rate, improves safety and reliability, and ensures stable storage and retrieval of goods in narrow aisle environments.
Smart Images
Figure CN120664475A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of forklift equipment, and in particular to a hydraulic system for a man-mounted three-way forklift. Background Art
[0002] The three-way forklift is designed for narrow aisle and high-density storage environments. The operator can vertically lift the forklift to the shelf height with the cab, and the forklift has the ability to move in three directions (left and right sideways and 180° rotation), thus enabling the retrieval and placement of goods in narrow aisle and high-density storage environments without turning. With the advancement of warehouse logistics, it has become a key development direction of forklifts.
[0003] However, in order to achieve lifting, side shifting and rotation, the existing man-mounted three-way forklift needs to lay out multiple oil circuits and circuit pipes, and all of them need to be connected from the valve block in the vehicle body, bypass the pulleys on the door frame to reach various functional components, which leads to a large number of oil circuits and circuits in the man-mounted three-way forklift, making it difficult to lay them out. Moreover, when bypassing a higher door frame, too many oil circuits and circuit pipes will increase its manufacturing cost. In the process of long-term use, they will be stretched, and the pipes will wear each other and between them and the pulleys, which will easily lead to wear of the oil circuits or circuit pipes, disengagement of the crimping joints, and other faults. As a result, the failure rate of the man-mounted three-way forklift is high, there are great safety hazards, and the stability and reliability are poor.
[0004] Therefore, there is an urgent need for a hydraulic system for a man-mounted three-way forklift to solve the defects of the existing man-mounted three-way forklift during actual operation. Summary of the Invention
[0005] The present application proposes a hydraulic system for a man-mounted three-way forklift, which has the advantages of effectively reducing the number of oil circuits and circuit pipes to be laid thereon, making it less likely for the oil circuits and circuit pipes on the man-mounted three-way forklift to be worn out, or for the crimped joints to become detached, during long-term use. It has the advantages of high safety and reliability, and is used to solve the problems of existing man-mounted three-way forklifts requiring a large number of oil circuits and circuits to be laid out, which is difficult, and when bypassing a higher mast, the excessive number of oil circuits and circuit pipes will increase the manufacturing cost, and during long-term use, the oil circuits or circuit pipes will be stretched, and the pipes will wear each other and wear against the pulleys, which can easily lead to wear and detachment of the crimped joints.
[0006] To achieve the above-mentioned purpose, the present application adopts the following technical scheme: a man-mounted three-way forklift hydraulic system, including a forklift body, an oil supply mechanism for driving the various functional components inside the forklift body, and a main mast is fixedly installed on one side of the end of the forklift body, a main lifting oil cylinder is provided inside the main mast, and a cab is connected to the end of the main mast through the main lifting oil cylinder, and then, under the driving action of the main lifting oil cylinder, the cab can be forced to move up and down along the trajectory of the main mast, and a side shift motor is provided at the outer end of the cab, a rotating oil cylinder is fixedly installed on the outside of the side shift motor, and a sub-mast is fixedly installed on the outside of the rotating oil cylinder, and then, under the driving action of the side shift motor and the rotating oil cylinder, the sub-mast can be driven to move sideways or rotate, a linkage frame is movably connected to the outer surface of the sub-mast, and a fork assembly for carrying cargo is provided on one side of the outer surface of the linkage frame, The linkage frame forms a transmission connection with the auxiliary mast through an auxiliary lifting oil cylinder fixedly installed inside the auxiliary mast, and under the driving action of the auxiliary lifting oil cylinder, the linkage frame and the goods on it can be driven to move up and down along the track of the auxiliary mast, and cooperate with the side shift motor and the rotating oil cylinder to perform side shift or rotation of the linkage frame and the goods on it, so as to complete the storage and retrieval of goods in narrow aisles and high-density storage environments. A main valve block connected to the oil supply mechanism is provided on one side of the interior of the forklift body, and one end of the main valve block is connected to the auxiliary valve block fixedly installed on the cab through an auxiliary valve block oil supply pipe arranged on the outside of the main mast. The oil supply mechanism is directly connected to the main lifting cylinder through the main valve block, and the side shift motor, rotating oil cylinder and auxiliary lifting cylinder are connected to one end of the main valve block through the auxiliary valve block, and provide corresponding power support for the actions of the side shift motor, rotating oil cylinder and auxiliary lifting cylinder through the oil supply mechanism;
[0007] Among them, the oil supply and return of the side shift motor, rotating cylinder and auxiliary lifting cylinder are provided by the auxiliary valve block, and the oil supply and return of the auxiliary valve block are provided by the main valve block and form a closed loop with the oil supply mechanism. The hydraulic systems corresponding to the rotation, side shift and auxiliary lifting of the goods are designed separately and integrated in the auxiliary valve block on the cab, which can be raised and lowered synchronously with the main mast, so that there is only one auxiliary valve block oil supply pipe (two oil supply and return pipes) through the oil circuit and circuit pipeline of the main mast, thereby effectively reducing the number of pipelines passing through the oil circuit and circuit on the main mast, and reducing the cost and difficulty of laying the pipelines. At the same time, as the number of pipelines is reduced, the wear and tear between them is also reduced, and the failure rate is reduced, which effectively improves the safety and reliability of the manned three-way forklift during operation.
[0008] Furthermore, a slide rail with a rack on the outside is provided on one side of the exterior of the cab, and the side shift motor is slidably connected to the slide rail and forms an engaging transmission with the rack on it, thereby accurately and stably driving the side shift motor and the components thereon to move left and right to perform cargo picking and placing operations.
[0009] Furthermore, the sub-gantry is composed of two I-beams, and a guide wheel in contact with the inner wall of the I-beam is provided on the inner side of the linkage frame. The setting of the guide wheel can effectively reduce the friction resistance between the inner wall of the linkage frame and the outer surface of the sub-gantry, thereby preventing the linkage frame from excessive wear during the up and down movement.
[0010] Furthermore, an adjustment mechanism is provided on the pin shaft of the guide wheel, and the adjustment mechanism includes an extrusion oil cylinder with an inclined structure at the bottom end and in contact with the outer surface of the guide wheel, and the interior of the extrusion oil cylinder is connected to the auxiliary valve block through an oil inlet pipeline to form a connection circuit, and the output shaft at the top end of the extrusion oil cylinder is in contact with a piezoelectric module fixedly mounted on one side of the top end of the linkage frame, and the outer surface of the piezoelectric module is transmission-connected to the pin shaft on the guide wheel through a connecting rod;
[0011] Furthermore, when the guide wheel wears out during long-term use, causing the linkage frame to tilt, the downward movement of the squeezing cylinder can force the guide wheel to deviate in the opposite direction, and drive the linkage frame and the goods on it to deviate in the opposite direction to straighten the goods, thereby effectively preventing the goods on it from tipping over due to excessive deflection angle.
[0012] Furthermore, the number of the adjustment mechanisms is set to four groups and they are symmetrically distributed on the front and rear sides of the linkage frame. At the same time, the two groups of adjustment mechanisms located on the same side are respectively arranged at the upper right corner and the lower left corner of the linkage frame, so as to synchronously apply forces in opposite directions to the upper right corner and the lower left corner of the linkage frame, thereby effectively improving the effect of adjusting the angle of the linkage frame.
[0013] Furthermore, an electrical feedback connection is formed between the piezoelectric module and the extrusion cylinder, and a pressure threshold is preset on the piezoelectric module. When the pressure carried by the piezoelectric module is within the range of the pressure threshold, the extrusion cylinder is not triggered through the auxiliary valve block. When the pressure carried by the piezoelectric module is less than the pressure threshold, the extrusion cylinder is triggered through the auxiliary valve block, thereby applying a force in the opposite direction to the guide wheel at the corresponding position.
[0014] Furthermore, a top column whose surface contacts the inner wall of the auxiliary gantry is provided on one side of the outer portion of the extrusion cylinder, thereby effectively reducing the friction resistance between the extrusion cylinder and the inner wall of the auxiliary gantry when the extrusion cylinder moves up and down with the guide wheel.
[0015] The beneficial effects of the present invention are as follows:
[0016] 1. The present application provides a hydraulic system for a man-mounted three-way forklift. For the setting of the auxiliary valve block and the connecting structure thereon, the hydraulic systems corresponding to the rotation, lateral shift and auxiliary lifting of the cargo are separately designed and integrated into the auxiliary valve block on the cab. It can be raised and lowered synchronously with the main mast, so that the oil circuit and circuit pipelines passing through the main mast have only one auxiliary valve block oil supply pipe, thereby effectively reducing the number of pipelines passing through the oil circuit and circuit on the main mast, and reducing the cost and difficulty of laying the pipelines. At the same time, as the number of pipelines is reduced, the wear between them is also reduced, and the failure rate is reduced, thereby effectively improving the safety and reliability of the man-mounted three-way forklift during operation.
[0017] 2. The hydraulic system of a man-mounted three-way forklift provided in the present application has a setting for the guide wheel and the adjustment mechanism thereon. When the guide wheel causes the linkage frame to tilt due to wear during long-term use, the downward movement of the squeezing cylinder can force the guide wheel to deflect in the opposite direction, and drive the linkage frame and the cargo thereon to deflect in the opposite direction to straighten the cargo, thereby effectively preventing the cargo thereon from tipping over due to excessive deflection angle, further improving the safety and reliability of the man-mounted three-way forklift during operation. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] 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 description of the prior art. Obviously, the drawings described below are only embodiments of the present invention. Those skilled in the art can also derive other drawings based on the provided drawings without inventive work.
[0019] Figure 1 This is a schematic diagram of the main structure of the present invention;
[0020] Figure 2 It is a side structural schematic diagram of the present invention;
[0021] Figure 3 A diagram of the hydraulic pipeline connection system of the structure of the present invention;
[0022] Figure 4 It is a structural schematic diagram of the linkage frame of the present invention;
[0023] Figure 5 It is a partial cross-sectional view of the structural linkage frame of the present invention;
[0024] Figure 6 The structure of the present invention Figure 5 Front view of
[0025] Figure 7 The structure of the present invention Figure 5 A is an enlarged schematic diagram.
[0026] In the figure: 1-forklift body, 2-oil supply mechanism, 3-main mast, 4-main lifting cylinder, 5-side shift motor, 6-rotating cylinder, 7-auxiliary mast, 8-linkage frame, 9-auxiliary lifting cylinder, 10-main valve block, 11-auxiliary valve block, 12-auxiliary valve block oil supply pipe, 13-guide wheel, 14-adjusting mechanism, 15-extrusion cylinder, 16-jack column, 17-piezoelectric module, 18-oil inlet pipeline. DETAILED DESCRIPTION
[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying 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 efforts are within the scope of protection of the present invention.
[0028] like Figure 1 、 Figure 2 As shown, a hydraulic system of a man-mounted three-way forklift comprises a forklift body 1, an oil supply mechanism 2 for driving the movement of various functional components is provided inside the forklift body 1, and a main mast 3 is fixedly installed on one side of the end of the forklift body 1, a main lifting oil cylinder 4 is provided inside the main mast 3, and a cab is connected to the end of the main mast 3 through the main lifting oil cylinder 4, and then, under the driving action of the main lifting oil cylinder 4, the cab can be forced to move up and down along the trajectory of the main mast 3, a side shift motor 5 is provided at the outer end of the cab, a rotating oil cylinder 6 is fixedly installed on the outside of the side shift motor 5, and a sub-mast 7 is fixedly installed on the outside of the rotating oil cylinder 6, and then, between the side shift motor 5 and the rotating oil cylinder 6, a side shift motor 5 is provided. Under the driving action of the rotary cylinder 6, the sub-gantry 7 can be driven to move sideways or rotate. The outer surface of the sub-gantry 7 is movably connected with a linkage frame 8, and a fork assembly for carrying goods is provided on one side of the outer surface of the linkage frame 8. The linkage frame 8 is connected to the sub-gantry 7 through the auxiliary lifting cylinder 9 fixedly installed inside the sub-gantry 7. Under the driving action of the auxiliary lifting cylinder 9, the linkage frame 8 and the goods on it can be driven to move up and down along the track of the sub-gantry 7, and in conjunction with the side shift motor 5 and the rotary cylinder 6, the linkage frame 8 and the goods on it can be moved sideways or rotated to complete the storage and retrieval of goods in narrow aisles and high-density storage environments. Figure 3As shown, a main valve block 10 connected to the oil supply mechanism 2 is provided on one side of the interior of the forklift body 1, and one end of the main valve block 10 is connected to the auxiliary valve block 11 fixedly installed on the cab through the auxiliary valve block oil supply pipe 12 arranged on the outside of the main mast 3. The oil supply mechanism 2 is directly connected to the main lift cylinder 4 through the main valve block 10, while the side shift motor 5, the rotary cylinder 6 and the auxiliary lift cylinder 9 are connected to one end of the main valve block 10 through the auxiliary valve block 11, thereby providing corresponding power support for the movement of the side shift motor 5, the rotary cylinder 6 and the auxiliary lift cylinder 9 through the oil supply mechanism 2;
[0029] Among them, the oil supply and return of the side shift motor 5, the rotating cylinder 6 and the auxiliary lifting cylinder 9 are provided by the auxiliary valve block 11, and the oil supply and return of the auxiliary valve block 11 are provided by the main valve block 10 and form a closed loop with the oil supply mechanism 2. The hydraulic system corresponding to the rotation, side shift and auxiliary lifting of the goods is designed separately and integrated in the auxiliary valve block 11 on the cab, which can be raised and lowered synchronously with the main mast 3, so that there is only one auxiliary valve block oil supply pipe 12 for oil supply and return in the oil circuit and circuit pipeline through the main mast 3, thereby effectively reducing the number of pipelines passing through the oil circuit and circuit on the main mast 3, and reducing the cost and difficulty of laying the pipelines. At the same time, as the number of pipelines is reduced, the wear between them is also reduced, and the failure rate is reduced, which effectively improves the safety and reliability of the manned three-way forklift during operation.
[0030] like Figure 2 As shown, in the present technical solution, a slide rail with a rack on the outside is provided on one side outside the cab, and the side shift motor 5 is slidably connected to the slide rail and forms an engaging transmission with the rack on it, thereby accurately and stably driving the side shift motor 5 and the components thereon to move left and right to perform cargo picking and placing operations.
[0031] like Figure 4 、 Figure 5 As shown, in the present technical solution, the sub-gantry 7 is composed of two I-beams, and a guide wheel 13 in contact with the inner wall of the I-beam is provided on the inner side of the linkage frame 8. The setting of the guide wheel 13 can effectively reduce the friction resistance between the inner wall of the linkage frame 8 and the outer surface of the sub-gantry 7, thereby preventing the linkage frame 8 from excessive wear during the up and down movement.
[0032] like Figure 2 、 Figure 6 as well as Figure 7As shown, in this technical solution, an adjustment mechanism 14 is provided on the pin shaft of the guide wheel 13. The adjustment mechanism 14 includes an extrusion cylinder 15 whose bottom end is set as an inclined structure and contacts the outer surface of the guide wheel 13. The interior of the extrusion cylinder 15 is connected to the auxiliary valve block 11 through an oil inlet pipeline 18 to form a connection circuit. The output shaft at the top of the extrusion cylinder 15 contacts the piezoelectric module 17 fixedly mounted on one side of the top of the linkage frame 8, and the outer surface of the piezoelectric module 17 is transmission-connected to the pin shaft on the guide wheel 13 through a connecting rod.
[0033] Furthermore, when the guide wheel 13 wears out during long-term use, causing the linkage frame 8 to tilt, the downward movement of the squeezing cylinder 15 can force the guide wheel 13 to deflect in the opposite direction, and drive the linkage frame 8 and the goods thereon to deflect in the opposite direction to straighten the goods, thereby effectively preventing the goods thereon from tipping over due to excessive deflection angle.
[0034] like Figure 4 、 Figure 6 As shown, in the present technical solution, the number of the adjustment mechanisms 14 is set to four groups and they are symmetrically distributed on the front and rear sides of the linkage frame 8. At the same time, the two groups of adjustment mechanisms 14 located on the same side are respectively arranged at the upper right corner and the lower left corner of the linkage frame 8, so as to synchronously apply forces in opposite directions to the upper right corner and the lower left corner of the linkage frame 8, so as to effectively improve the effect of adjusting the angle of the linkage frame 8.
[0035] like Figure 2 、 Figure 7 As shown, in the present technical solution, an electrical feedback connection is formed between the piezoelectric module 17 and the extrusion cylinder 15, and a pressure threshold is preset on the piezoelectric module 17. When the pressure carried by the piezoelectric module 17 is within the range of the pressure threshold, the extrusion cylinder 15 is not triggered through the auxiliary valve block 11. When the pressure carried by the piezoelectric module 17 is less than the pressure threshold, the extrusion cylinder 15 is triggered through the auxiliary valve block 11, thereby applying a force in the opposite direction to the guide wheel 13 at the corresponding position.
[0036] like Figure 7 As shown, in the present technical solution, a top column 16 is provided on one side of the outside of the extrusion cylinder 15, the surface of which contacts the inner wall of the sub-gantry 7, thereby effectively reducing the friction resistance between the extrusion cylinder 15 and the inner wall of the sub-gantry 7 during the process of the extrusion cylinder 15 moving up and down with the guide wheel 13.
[0037] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A hydraulic system for a man-mounted three-way forklift, comprising a forklift body (1), an oil supply mechanism (2) being provided inside the forklift body (1), and a main mast (3) being fixedly mounted on one side of the end of the forklift body (1), a main lifting oil cylinder (4) being provided inside the main mast (3), and a cab being transmission-connected to the end of the main mast (3) through the main lifting oil cylinder (4), a side shift motor (5) being provided at the outer end of the cab, a rotating oil cylinder (6) being fixedly mounted outside the side shift motor (5), and a sub-mast (7) being fixedly mounted outside the rotating oil cylinder (6), a linkage frame (8) being movably sleeved on the outer surface of the sub-mast (7), the linkage frame (8) being transmission-connected to the sub-mast (7) through a sub-lifting oil cylinder (9) fixedly mounted inside the sub-mast (7), and characterized in that: A main valve block (10) connected to an oil supply mechanism (2) is provided on one side of the interior of the forklift body (1), and one end of the main valve block (10) is connected to an auxiliary valve block (11) fixedly mounted on the cab via an auxiliary valve block oil supply pipe (12) arranged on one side of the exterior of the main mast (3). The oil supply mechanism (2) is directly connected to the main lifting cylinder (4) via the main valve block (10), and the side shift motor (5), the rotary cylinder (6) and the auxiliary lifting cylinder (9) are connected to one end of the main valve block (10) via the auxiliary valve block (11).
2. The hydraulic system of a man-mounted three-way forklift according to claim 1, characterized in that: A slide rail with a rack on the outside is provided on one side of the exterior of the cab, and a side shift motor (5) is slidably connected to the slide rail and forms a meshing transmission with the rack on the slide rail.
3. The hydraulic system of a man-mounted three-way forklift according to claim 2, characterized in that: The auxiliary door frame (7) is composed of two I-beams, and a guide wheel (13) in contact with the inner wall of the I-beam is provided on the inner side of the linkage frame (8).
4. The hydraulic system of a man-mounted three-way forklift according to claim 3, characterized in that: An adjusting mechanism (14) is provided on the pin shaft of the guide wheel (13). The adjusting mechanism (14) includes an extrusion oil cylinder (15) whose bottom end is set as an inclined structure and contacts the outer surface of the guide wheel (13). The interior of the extrusion oil cylinder (15) is connected to the auxiliary valve block (11) through an oil inlet pipeline (18) to form a connection loop. The output shaft at the top end of the extrusion oil cylinder (15) contacts the piezoelectric module (17) fixedly installed on one side of the top end of the linkage frame (8), and the outer surface of the piezoelectric module (17) is connected to the pin shaft on the guide wheel (13) through a connecting rod.
5. The hydraulic system of a man-mounted three-way forklift according to claim 4, characterized in that: The number of the adjustment mechanisms (14) is set to four and they are symmetrically distributed on the front and rear sides of the linkage frame (8). At the same time, the two adjustment mechanisms (14) located on the same side are respectively arranged at the upper right corner and the lower left corner of the linkage frame (8).
6. The hydraulic system of a man-mounted three-way forklift according to claim 5, characterized in that: An electrical feedback connection is formed between the piezoelectric module (17) and the extrusion cylinder (15), and a pressure threshold is preset on the piezoelectric module (17). When the pressure carried by the piezoelectric module (17) is within the range of the pressure threshold, the extrusion cylinder (15) is not triggered through the auxiliary valve block (11), and when the pressure carried by the piezoelectric module (17) is less than the pressure threshold, the extrusion cylinder (15) is triggered through the auxiliary valve block (11).
7. The hydraulic system of a man-mounted three-way forklift according to claim 4, characterized in that: A top column (16) whose surface contacts the inner wall of the auxiliary door frame (7) is provided on one side of the outside of the extrusion oil cylinder (15).