Three-way stacking type forklift

Abstract

The utility model discloses a three-way stacking type forklift. The three-way stacking type forklift comprises a forklift body; the door frame is arranged at the front end of the vehicle body; the bracket can be selectively mounted on the door frame in a linear sliding manner along a first direction; the lateral moving frame can be selectively installed on the support in a linear sliding mode in the second direction, and the first direction and the second direction are perpendicular to each other; and a fork arm carrier mounted relative to the sidesway frame by means of a single helical oscillating hydraulic motor, where the fork arm carrier has a cantilever fixed to a mounting disk on an output shaft of the single helical oscillating hydraulic motor.

Description

Technical Field

[0001] The present application generally relates to a three-way stacking forklift, and in particular to a three-way stacking forklift whose fork frame is driven by a single spiral swing hydraulic motor. Background Art

[0002] Three-way stacking forklifts can use their forks to move and manipulate goods in three-dimensional directions relative to the ground, and are effective tools for warehouse management and handling. Usually, three-way stacking forklifts use batteries as power sources, and use the hydraulic lifting system equipped to drive the forks to carry out cargo handling work, especially in narrow-aisle high-bay warehouses. However, in the application of narrow-aisle high-bays, the forklift's fork frame often puts forward higher stability and safety requirements when lifting and carrying goods.

[0003] In a traditional three-way stacking forklift, the fork frame is connected to the mast by a double hydraulic cylinder (or hydraulic motor) and a chain drive to ensure that the fork frame can rotate in both directions relative to the mast. However, when the cargo being transported is heavy, the inertia of the cargo will cause the fork frame to shake when the rotation stops. This shaking will continue to affect the stability of the chain, causing the fork frame to shake. In addition, if the shaking exists for a long time, the durability of the chain will deteriorate, and there may even be a production accident where the forklift overturns due to chain breakage. Utility Model Content

[0004] In order to ensure that the fork frame for transporting goods does not shake relative to the door frame when the rotation stops, and also to improve the safety of cargo transportation, the present application proposes an improved three-way stacking forklift, which can avoid the occurrence of the above problems.

[0005] According to one aspect of the present application, a three-way stacking forklift is provided, comprising:

[0006] Vehicle body;

[0007] A gantry mounted at the front end of the vehicle body;

[0008] A bracket mounted on the door frame capable of selectively sliding linearly along a first direction;

[0009] A side shift frame mounted on the bracket so as to be selectively slidable in a straight line along a second direction, wherein the first direction and the second direction are perpendicular to each other; and

[0010] A fork carriage is mounted relative to the side shift frame by means of a single screw swing hydraulic motor, wherein the fork carriage has a cantilever arm fixed to a mounting plate on an output shaft of the single screw swing hydraulic motor.

[0011] Optionally, the three-way stacking forklift also includes:

[0012] A hydraulic control subsystem, wherein the hydraulic control subsystem has a proportional solenoid valve, which is arranged between a fluid reservoir interface and the single screw swing hydraulic motor, and a fluid input port and a fluid drain port on an input side of the proportional solenoid valve are respectively connected to the fluid of the fluid reservoir interface via pipelines, and a first fluid output port and a second fluid output port on an output side of the proportional solenoid valve are respectively connected to the first fluid port and the second fluid port of the single screw swing hydraulic motor via pipelines.

[0013] Optionally, the hydraulic fluid output by the proportional solenoid valve is selectively provided to the first fluid port or the second fluid port of the single screw swing hydraulic motor via corresponding pipelines to drive the output shaft of the single screw swing hydraulic motor to rotate in different directions.

[0014] Optionally, the proportional solenoid valve is configured to slowly increase the pressure of the hydraulic fluid driving the output shaft to rotate when the output shaft of the single screw swing hydraulic motor starts to rotate, or to slowly reduce the pressure of the hydraulic fluid driving the output shaft to rotate when the output shaft of the single screw swing hydraulic motor stops rotating.

[0015] Optionally, the cantilever of the fork frame is two cantilever arms parallel to and separated from each other, the mounting plates on the output shaft of the single spiral swing hydraulic motor are two mounting plates located at opposite ends of the output shaft, and the two cantilever arms and the two mounting plates are fixed to each other respectively.

[0016] Optionally, the single spiral swing hydraulic motor includes a housing, which is fixed to the end of the side shift frame opposite to the support.

[0017] Optionally, the rotation axis of the output shaft of the single spiral swing hydraulic motor is parallel to the first direction.

[0018] Optionally, the two cantilevers are located on opposite sides of the two mounting plates in the first direction.

[0019] Optionally, the proportional solenoid valve includes a three-position two-way switch to be arranged between the input side and the output side and selectively switch the fluid communication between the fluid input port, the fluid drain port, the first fluid output port and the second fluid output port.

[0020] Optionally, the fork carriage is configured to move relative to the support along with the side shifting frame.

[0021] By adopting the above-mentioned technical means of the present application, since the chain transmission mechanism is abandoned and a single hydraulic motor is directly used to connect the fork frame and the side shift frame, when the relative rotation between the two stops, the fork frame can be more smoothly realized relative to the side shift frame, thereby preventing the fork frame from shaking due to the inertia of the goods it carries and causing production accidents, thereby improving the safety and stability of the three-way stacking forklift. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The principles and various aspects of the present application can be more fully understood from the following detailed description in conjunction with the following drawings. It should be noted that the scales of the drawings may be different for the purpose of clear description, but this will not affect the understanding of the present application. In the drawings:

[0023] Figure 1 A schematic diagram of a three-way stacking forklift is shown;

[0024] Figure 2 Schematically shows a side view of a portion of a three-way stacker forklift according to an embodiment of the present application;

[0025] Figure 3 A partial perspective view of a three-way stacking forklift according to another embodiment of the present application is schematically shown;

[0026] Figure 4 Schematically shows the Figure 2 Another partial perspective view of the corresponding three-way stacking forklift;

[0027] Figure 5 A hydraulic motor according to an embodiment of the present application used in a three-way stacking forklift is schematically shown alone;

[0028] Figure 6 A portion of a control system block diagram of a three-way stacking forklift according to an embodiment of the present application is schematically shown; and

[0029] Figure 7 A hydraulic diagram of a portion of a hydraulic control subsystem is schematically shown. DETAILED DESCRIPTION

[0030] In the various figures of the present application, features with the same structure or similar functions are represented by the same reference numerals.

[0031] Figure 1 A three-way stacking forklift 100 is schematically shown, for example, which generally includes a vehicle body 110, a mast 120 vertically mounted at the front end of the vehicle body 110, a bracket 130 slidably mounted on the mast 120, a side shift frame 140 slidably mounted on the bracket 130, and a fork frame 150 rotatably mounted relative to the side shift frame 140. Figures 1 to 4For the sake of clarity, a three-dimensional coordinate system XYZ is defined in the accompanying drawings, wherein the front-to-back direction (i.e., the front-to-back direction of the vehicle body 110) is roughly defined as XX, the lateral direction (i.e., the left-to-right direction of the vehicle body 110) is roughly defined as YY, and the vertical direction (i.e., the height direction of the vehicle body 110) is roughly defined as ZZ, and each direction is perpendicular to each other.

[0032] The vehicle body 110 can be equipped with wheels, for example, to realize the walking function of the vehicle body 110 driven by a motor. The motor of the vehicle body 110 can be powered by a battery (not shown) installed therein, for example. In addition, a driving device (not shown) is provided between the gantry 120 and the bracket 130, so that the bracket 130 can selectively move back and forth in a straight line or lock a position in the vertical direction ZZ as required. In addition, a driving device (not shown) is also provided between the bracket 130 and the side shift frame 140, so that the side shift frame 140 can selectively move back and forth in a straight line or lock a position in the lateral direction YY as required. These driving devices can be implemented in any manner familiar to those skilled in the art, and therefore description is omitted herein.

[0033] According to an embodiment of the present application, the fork carriage 150 can be mounted relative to the side shift frame 140 about a pivot axis parallel to the vertical direction ZZ, so that the fork carriage 150 can move relative to the bracket 130 along the lateral direction YY together with the side shift frame 140 and / or move along the vertical direction ZZ together with the bracket 130, and can also selectively pivot relative to the side shift frame 140 about the pivot axis. The side shift frame 140 is configured so that the pivotal movement of the fork carriage 150 relative thereto is not blocked by the bracket 130. The fork carriage 150 is shown to have a support plate 151, from which two forks 152 are mounted substantially in parallel.

[0034] According to an embodiment of the present application, a single spiral swing hydraulic motor 170 (such as Figure 5As shown). The fork frame 150 is connected to the side shift frame 140 by means of a hydraulic motor 170. For example, two cantilevers 153 spaced apart from each other and parallel are provided on the side of the support plate 151 of the fork frame 150 opposite to the fork 152. For example, the hydraulic motor 170 includes a housing 171. The housing 171 can be fixed at the free end of the side shift frame 140, for example, by bolts. At the same time, the hydraulic motor 170 has a mounting plate 172 extending from opposite ends (along the vertical direction ZZ) of the housing 171. The two cantilevers 153 of the fork frame 150 are respectively located on the upper and lower sides of the two opposite mounting plates of the hydraulic motor 170 along the vertical direction ZZ, so that the two mounting plates 172 of the hydraulic motor 170 can be fixed to the two cantilevers 153 of the fork frame 150 by means of a bolt-nut mounting and fixing method. According to an embodiment of the present application, the output shaft of the hydraulic motor 170 is substantially along the vertical direction ZZ, and the two mounting plates 172 are respectively connected to the output shaft of the hydraulic motor 170 in a non-rotatable manner. In this way, the output shaft of the hydraulic motor 170 can drive the two mounting plates 172 to rotate coaxially.

[0035] Figure 6 The schematic diagram shows a part of the control system block diagram of the three-way stacking forklift 100 according to the embodiment of the present application. The control system of the three-way stacking forklift 100 may include, for example, an electric control subsystem and a hydraulic control subsystem. The electric control subsystem may include, for example, a control console 111, a central controller ECU, a motor 112, etc. Figure 6 The hydraulic control subsystem includes, for example, a hydraulic circuit composed of a fluid storage tank, a hydraulic pump, a hydraulic pipeline, and various hydraulic valves, and the hydraulic circuit can be in fluid communication with the hydraulic motor 170, for example, to control the operation of the hydraulic motor 170. In addition, the walking mechanism that enables the vehicle body 110 to realize the walking function can also be driven by the electronic control subsystem, for example, the walking mechanism can also be equipped with a motor other than the motor 112 to drive the wheels of the vehicle body 110 to rotate. The console 111 can, for example, include manual control devices such as operating handles, control buttons, etc., and the console 111 can be set on the vehicle body 110 and operated by a staff member sitting in the cab of the vehicle body 110. The central controller ECU receives instructions from the console 111 and issues operating instructions to the motor of the walking mechanism and / or the motor 112 for driving the hydraulic pump. The central controller ECU can, for example, include a computing device such as a computer, a microprocessor chip, etc., and is equipped with a memory to store pre-written programs. The control process described below in the present application can be stored in the memory as a computer program code, and called and executed by the central controller ECU when necessary.

[0036] Figure 7The hydraulic diagram of a part of the hydraulic control subsystem is schematically shown, and this part is only configured to control the switching of the hydraulic motor 170. It should be clear to those skilled in the art that the hydraulic control subsystem can also be configured to include but not limited to realizing functions such as moving the support 130 and / or the side shift frame 140. Figure 7 As shown, in the shown part of the hydraulic control subsystem, an electromagnetic proportional valve 181 is included. The electromagnetic proportional valve 181 can be controlled by, for example, a central controller ECU, and the fluid pressure output from the electromagnetic proportional valve 181 is changed accordingly by inputting a changed electrical signal. The electromagnetic proportional valve 181 includes, for example, a fluid input port 181a and a fluid drain port 181b on the input side, and includes, for example, a first fluid output port 181c and a second fluid output port 181d on the output side. It should be clear to those skilled in the art that Figure 7 The implementation of the electromagnetic proportional valve 181 shown is only illustrative; any implementation of the electromagnetic proportional valve that can achieve the functions required by the present application can be adopted in the electromagnetic proportional valve 181. Figure 7 The hydraulic motor 170 includes a first fluid port 170a and a second fluid port 170b provided on a housing 171, wherein, for example, the first fluid port 170a can be used as a fluid input port, and the second fluid port 170b can be used as a drain port. Figure 2 As shown, the first fluid port 170a and the second fluid port 170b of the hydraulic motor 170 can be fluidly connected to the first fluid output port 181c and the second fluid output port 181d of the electromagnetic proportional valve 181 via pipelines P100 and P200, respectively. In the context of the present application, the term "pipeline" can be a pipeline such as a hose or a hard pipe for transmitting hydraulic fluid.

[0037] According to the embodiment of the present application, the related components inside the electromagnetic proportional valve 181 can relatively slowly close the fluid pressure output from the first fluid output port 181c or the second fluid output port 181d on the output side under the control of the electrical signal inputted via the central controller ECU. Compared with the chain transmission method adopted in the prior art, the slowly output fluid pressure can significantly reduce the shaking generated when the fork frame 150 stops rotating relative to the side shift frame 140.

[0038] like Figure 2As shown, the electromagnetic proportional valve 181 can be arranged between the fork frame 150 and the mast 120, for example, arranged on the side shift frame 140; at the same time, the fluid input port 181a and the fluid drain port 181b on the input side of the electromagnetic proportional valve 181 can be connected to the reservoir interface 190 provided at the mast 120 via pipelines P300 and P400 respectively. The reservoir interface 190 can be configured to be in fluid communication with the reservoir, so that the hydraulic fluid stored in the reservoir can be pressurized and supplied to and from the electromagnetic proportional valve 181 via the reservoir interface 190. A three-position two-way electromagnetic switch 1811 is provided inside the electromagnetic proportional valve 181. According to the electrical signal received by the electromagnetic proportional valve 181, the three-position two-way electromagnetic switch 1811 can be switched accordingly so that the hydraulic fluid supplied through the fluid input port 181a on the input side can be output from the first fluid output port 181c or the second fluid output port 181d on the output side accordingly, so as to realize the rotation direction switching or rotation start or stop function of the output shaft of the hydraulic motor 170. When it is necessary to start or stop the rotation of the output shaft of the hydraulic motor 170, for example, when the operator of the control console 111 manually inputs a control command, the central controller ECU calls the corresponding program and generates an electrical signal to the electromagnetic proportional valve 181, so that its electromagnetic switch 1181 can be switched from the middle position to the corresponding operation position or returned from the corresponding operation position to the middle position, and in this process, the value of the electrical signal changes slowly (for example, decreases) accordingly, so that the pressure of the fluid supplied to the first fluid port 170a or the second fluid port 170b through the corresponding pipeline also changes slowly accordingly, and further ensures that the fork frame 150 starts or stops slowly relative to the side shift frame 140, so as to reduce the shaking phenomenon of the fork frame 150 due to the inertia of the goods it carries. In the context of this application, the term "slowly" is preferably that the fork frame 150 does not shake.

[0039] Although the specific embodiments of the present application are described in detail herein, they are provided only for the purpose of explanation and should not be considered to limit the scope of the present application. In addition, it should be clear to those skilled in the art that the various embodiments described in this specification can be used in combination with each other. Various replacements, changes and modifications can be conceived without departing from the spirit and scope of the present application.

Claims

1. A three-way stacking forklift, characterized in that: include: Vehicle body; A gantry mounted at the front end of the vehicle body; A bracket mounted on the door frame capable of selectively sliding linearly along a first direction; A side shift frame mounted on the bracket so as to be selectively slidable in a straight line along a second direction, wherein the first direction and the second direction are perpendicular to each other; as well as A fork carriage is mounted relative to the side shift frame by means of a single screw swing hydraulic motor, wherein the fork carriage has a cantilever arm fixed to a mounting plate on an output shaft of the single screw swing hydraulic motor.

2. The three-way stacking forklift according to claim 1, characterized in that: Also includes: A hydraulic control subsystem, wherein the hydraulic control subsystem has a proportional solenoid valve, which is arranged between a fluid reservoir interface and the single screw swing hydraulic motor, and a fluid input port and a fluid drain port on an input side of the proportional solenoid valve are respectively connected to the fluid of the fluid reservoir interface via pipelines, and a first fluid output port and a second fluid output port on an output side of the proportional solenoid valve are respectively connected to the first fluid port and the second fluid port of the single screw swing hydraulic motor via pipelines.

3. The three-way stacking forklift according to claim 2, characterized in that: The hydraulic fluid output by the proportional solenoid valve is selectively provided to the first fluid port or the second fluid port of the single screw swing hydraulic motor via corresponding pipelines to drive the output shaft of the single screw swing hydraulic motor to rotate in different directions.

4. The three-way stacking forklift according to claim 3, characterized in that: The proportional solenoid valve is configured to slowly increase the pressure of the hydraulic fluid driving the output shaft to rotate when the output shaft of the single screw swing hydraulic motor starts rotating or to slowly reduce the pressure of the hydraulic fluid driving the output shaft to rotate when the output shaft of the single screw swing hydraulic motor stops rotating.

5. The three-way stacking forklift according to claim 4, characterized in that: The cantilever of the fork frame is two cantilever arms which are parallel and spaced apart from each other, the mounting plates on the output shaft of the single spiral swing hydraulic motor are two mounting plates located at opposite ends of the output shaft, and the two cantilever arms and the two mounting plates are fixed to each other respectively.

6. The three-way stacking forklift according to claim 5, characterized in that: The single screw swing hydraulic motor includes a housing fixed to an end of the side shift frame opposite to the support.

7. The three-way stacking forklift according to claim 6, characterized in that: The rotation axis of the output shaft of the single screw swing type hydraulic motor is parallel to the first direction.

8. The three-way stacking forklift according to claim 7, characterized in that: The two cantilevers are located at opposite sides of the two mounting plates in the first direction.

9. The three-way stacking forklift according to claim 8, characterized in that: The proportional solenoid valve includes a three-position two-way switch, which is arranged between the input side and the output side and selectively switches the fluid communication between the fluid input port, the fluid drain port, the first fluid output port and the second fluid output port.

10. The three-way stacking forklift according to claim 9, characterized in that: The fork carriage is configured to move relative to the support frame along with the side shifting frame.

Images