A multifunctional forklift

Abstract

The present invention discloses a multifunctional forklift, including a frame, a gantry, a front wheel, a speed measuring structure, an angle measuring structure, a slider adjustment structure, and a dual-cylinder structure. The gantry includes a forward frame, the steering structure includes a slewing bearing and a steering bracket, the steering bracket is arranged above the front wheel, the speed measuring structure is connected to the other side of the rim and is connected to the steering bracket, the angle measuring structure is arranged in the center hole of the slewing bearing and is connected to the frame; one end of the dual-cylinder structure is fixed to the frame, and the other end is connected to the forward frame. The present invention completes speed measurement through the speed measuring structure, completes steering angle measurement through the angle measuring structure, increases the moving stroke of the forward frame through the dual-cylinder structure, and adjusts the distance between the two structural frames that move relative to each other in the forklift through the slider adjustment structure.

Description

Technical Field

[0001] The invention belongs to the technical field of forklifts, and in particular relates to a multifunctional forklift. Background Art

[0002] Forklifts are factory handling vehicles, various wheeled handling vehicles used for loading and unloading, stacking and short-distance transportation of palletized goods. However, existing forklifts have many shortcomings. For example, most forklifts are not equipped with speed or angle measuring structures; for example, due to the size of the forklift itself, only one cylinder can be used to move the forward frame in the gantry, resulting in a short stroke that can no longer meet the needs of most new factories; for example, the distances between the gantry and the frame, between the outer gantry and the inner gantry on the forklift often need to be adjusted, and the conventional gasket adjustment method is very inconvenient to operate due to the space constraints of the forklift. Summary of the Invention

[0003] The purpose of the present invention is to provide a multifunctional forklift to overcome the above technical problems.

[0004] The above technical objectives of the present invention are achieved through the following technical solutions:

[0005] A multifunctional forklift comprises a frame, a mast, and a front wheel, wherein the front wheel is rotated by a drive motor connected to one side of a wheel rim, and the drive motor is mounted on the frame via a steering structure, the mast comprises a forward frame, the steering structure comprises a slewing bearing and a steering bracket, and the steering bracket is disposed above the front wheel, and the multifunctional forklift further comprises:

[0006] A speed measuring structure, connected to the other side of the rim and connected to the steering bracket, for measuring speed;

[0007] An angle measuring structure, disposed in the center hole of the slewing bearing and connected to the vehicle frame, for performing angle measurement;

[0008] The slider adjustment structure is used to adjust the distance between two relatively moving structural frames in a forklift;

[0009] A double oil cylinder structure has one end fixed to the vehicle frame and the other end connected to the forward moving frame, and is used to increase the moving stroke of the forward moving frame.

[0010] Furthermore, the speed measuring structure and the angle measuring structure each include a measuring device and a mounting member connected to the measuring device;

[0011] The measuring device of the speed measuring structure is connected to the other side of the rim and can rotate synchronously with the front wheel, and the mounting member of the speed measuring structure is fixedly connected to the steering bracket;

[0012] The angle measuring structure is arranged in the center hole of the slewing bearing, the measuring device of the angle measuring structure is connected to the steering bracket and can rotate synchronously with the steering bracket, and the mounting part of the angle measuring structure is fixedly connected to the frame leg of the frame.

[0013] Furthermore, the measuring device of the speed measuring structure is an incremental encoder, and the mounting part includes a transition plate, an encoder connecting frame and a connecting plate, the transition plate is fixed to the rim, the incremental encoder is fixed to the encoder connecting frame, and its rotor passes through the encoder connecting frame and is connected to the transition plate, the encoder connecting frame extends to the outside of the front wheel and is connected to the connecting plate, and the connecting plate is vertically arranged and connected to the steering bracket.

[0014] Furthermore, the encoder connecting frame is a cylindrical structure with an opening at one end, and a through hole is provided at the other end for the rotor of the incremental encoder to pass through. A circular ring-shaped plate extends from the outer edge of the cylindrical structure close to the opening. The connecting plate is provided with a limiting hole for connecting the encoder connecting frame, and the circular ring-shaped plate is fixed in the limiting hole; the limiting hole is connected to an outer cover plate for covering the opening of the encoder connecting frame

[0015] Furthermore, the measuring device of the angle measurement structure is an absolute encoder, and the mounting part includes a coupling, an encoder bracket and a fixed cover plate, the coupling is fixedly connected to the steering bracket, the absolute encoder is connected to the encoder bracket, and its rotor passes through the encoder bracket and is connected to the coupling, a mounting hole is provided on the frame leg corresponding to the center hole of the slewing bearing, the encoder bracket is connected in the mounting hole, and the fixed cover plate is connected in the mounting hole and covers the encoder bracket.

[0016] Furthermore, the slider adjustment structure is arranged between two structural frames, and includes a connecting block, a guide block and a slider arranged side by side in sequence, the slider is fixedly connected to the guide block, the guide block is provided with a guide hole, and the side of the connecting block facing the guide block is fixedly connected with a guide pin corresponding to the guide hole, and the connecting block is connected with a jacking bolt for jacking the guide block so that the guide block moves along the axial direction of the guide pin, the guide block and the connecting block are connected by a tensioning bolt, the connecting block is fixed to one of the structural frames, and the corresponding slider is tightly attached to the other structural frame.

[0017] Furthermore, the dual-cylinder structure includes two oil cylinders that are connected to each other and arranged in parallel and two connecting oil pipes arranged along the length direction of the two oil cylinders. The two telescopic ends of the two oil cylinders are respectively fixed to the vehicle frame and the forward frame, and the telescopic directions of the two telescopic ends are opposite. The two ends of the connecting oil pipes are respectively close to the two ends of the oil cylinders. The same end of the two connecting oil pipes along their length direction is connected to the two oil cylinders respectively, and the two ends of each connecting oil pipe are respectively docked on the two oil cylinders.

[0018] Furthermore, the two oil cylinders are provided with two oil port joints, and the two oil port joints are installed on both ends of one of the oil cylinders or on the same end of the two oil cylinders.

[0019] Furthermore, the steering structure also includes a steering cylinder, a fixed bracket and a connecting pin. The fixed bracket includes two transverse connecting plates arranged up and down and parallel to the transverse plates of the frame legs of the frame. The two transverse connecting plates are fixed to the frame legs. The telescopic end of the steering cylinder is connected to the steering bracket through a front pin. A mounting hole is processed on the transverse plate. The connecting pin is connected to the mounting hole and is vertically connected to the two transverse connecting plates. The fixed end of the steering cylinder is arranged between the two transverse connecting plates and connected to the connecting pin.

[0020] Beneficial effects:

[0021] The present invention measures the speed of the forklift by means of a speed measuring structure installed on the outer side of the wheel rim, and the speed measuring structure is connected to the steering bracket, so that the speed measuring structure and the front wheel can be turned synchronously.

[0022] The present invention measures the steering angle of a forklift truck by using an angle measuring structure disposed within the slewing bearing and connected to the vehicle frame. Because the angle measuring structure is disposed within the slewing bearing, no additional installation space is required on the forklift truck and the forklift truck can be installed directly from above the vehicle frame legs. This not only provides accurate measurement and a simple structure, but also facilitates installation and removal.

[0023] The present invention adjusts the gap between the two structural frames by using the guide block, guide pin and jacking bolt in the slider adjustment structure, and the slider used does not affect the relative movement between the two structural frames;

[0024] The present invention can double the moving stroke of the forward moving frame on the basis of the existing oil cylinders through the double oil cylinder structure, without adjusting the structural space of the forklift. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the present invention;

[0026] Figure 2This is a schematic diagram of the exploded structure of the unassembled speed measuring structure of the present invention;

[0027] Figure 3 for Figure 2 Cross-section view after assembly;

[0028] Figure 4 This is a schematic diagram of the exploded structure of the unassembled angle measurement structure of the present invention;

[0029] Figure 5 for Figure 4 Cross-section view after assembly;

[0030] Figure 6 This is a schematic diagram of the exploded structure of the slider adjustment structure between the inner door frame and the outer door frame in the present invention;

[0031] Figure 7 Schematic diagram of the double oil cylinder structure of the present invention;

[0032] Figure 8 Schematic diagram of the steering structure of the present invention;

[0033] Figure: 10, frame; 11, transverse plate; 20, mast; 21, forward frame; 22, inner mast; 23, outer mast; 30, front wheel; 31, drive motor; 32, wheel rim; 40, steering structure; 41, slewing bearing; 42, steering bracket; 43, steering cylinder; 44, fixed bracket; 441, transverse connecting plate; 45, connecting pin; 46, front pin; 50, speed measuring structure; 51, incremental encoder; 52, transition plate; 53, encoder connecting frame ;54. Connecting plate;55. Annular plate;56. Outer cover;60. Angle measurement structure;61. Absolute encoder;62. Coupling;63. Encoder bracket;64. Fixed cover;65. Encoder fixing block;70. Slider adjustment structure;71. Connecting block;72. Guide block;73. Slider;74. Guide pin;75. Jacking bolt;76. Tension bolt;80. Double cylinder structure;81. Cylinder;82. Connecting oil pipe;83. Oil port joint. DETAILED DESCRIPTION

[0034] In the description of the present invention, unless otherwise specified, terms such as "upper," "lower," "left," "right," "front," and "rear" indicating directions or positional relationships are intended solely for purposes of describing the present invention and simplifying the description. They are not intended to indicate or imply that the devices or structures referred to must have a specific orientation and are therefore not to be construed as limiting the present invention. Furthermore, terms such as "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

[0035] The multifunctional forklift described in the present invention is based on the existing forklift structure and is adjusted in the following four aspects: (1) a speed measuring structure and an angle measuring mechanism are added; (2) the spacing adjustment method between the relatively movable structural frames in the forklift, such as between the inner mast and the fork frame, between the mast and the vehicle frame, and between the inner mast and the outer mast, is improved from the existing side roller plus gasket method to the slider adjustment method of the present invention; (3) the oil cylinder structure of the existing forward moving frame is improved to a double oil cylinder structure; (4) the steering structure of the existing front wheel is improved to facilitate installation and disassembly. The specific contents are as follows:

[0036] like Figure 1 As shown, the multifunctional forklift includes a frame 10, a mast 20, front wheels 30, a steering structure 40, a speed measuring structure 50, an angle measuring structure 60, a slider adjustment structure 70, and a dual-cylinder structure 80. The front wheels are rotated by a drive motor 31 connected to one side of a wheel rim 32, and the drive motor is mounted on the frame 10 via the steering structure 40. The mast includes a forward frame 21, and the steering structure includes a slewing bearing 41 and a steering bracket 42, wherein the steering bracket is disposed above the front wheels.

[0037] The following describes the four aspects mentioned above one by one:

[0038] Improvement in the first aspect: The speed measuring structure and the angle measuring structure both include a measuring device and a mounting member connected to the measuring device, combined with Figure 2-Figure 4 and Figure 8 This aspect will be explained.

[0039] Among them, such as Figure 2 and Figure 3 As shown, the measuring device of the speed measuring structure is an incremental encoder 51, as shown in FIG. Figure 8 As shown, it is connected to the other side of the rim and can rotate synchronously with the front wheel to achieve speed measurement; the mounting member of the speed measuring structure is fixedly connected to the steering bracket, so that the speed measuring structure can be turned synchronously with the steering bracket and the front wheel.

[0040] like Figure 2 and Figure 3As shown, the mounting parts of the speed measuring structure include a transition plate 52, an encoder connecting frame 53 and a connecting plate 54, wherein the transition plate is fixed to the other side of the rim, the incremental encoder is fixed to the encoder connecting frame, and its rotor passes through the encoder connecting frame and is connected to the transition plate, the encoder connecting frame extends outward from the rim to the outside of the front wheel, and is connected to the connecting plate, the connecting plate is vertically arranged and connected to the steering bracket, thereby the encoder connecting frame and the connecting plate are fixed by the steering bracket, and the incremental encoder is fixed by the encoder connecting frame, so that the rotor of the incremental encoder can rotate synchronously with the front wheel to realize measurement, and when the front wheel turns, it turns synchronously with the front wheel through the encoding connector and the connecting plate.

[0041] In order to avoid damage to the installed incremental encoder by debris and to facilitate assembly, the encoder connecting frame preferably adopts a cylindrical structure with an open end, and a through hole is provided at the other end for the rotor of the incremental encoder to pass through. The cylindrical structure faces the outside of the front wheel, and the opening direction is the same as the axial direction of the front wheel. In order to facilitate the connection between the encoder connecting frame and the connecting plate, a circular ring-shaped plate 45 is extended from the outer edge of the cylindrical structure close to the opening end, and a limiting hole for connecting the encoder connecting frame is provided on the connecting plate. The limiting hole is divided into two parts with decreasing diameters from the outside to the inside. The part with a smaller diameter is consistent with the outer diameter of the cylindrical structure, and the part with a larger diameter is consistent with the outer diameter of the circular ring plate. In this way, the cylindrical structure is clamped in the limiting hole and the circular ring plate is connected to the limiting hole by fasteners, thereby realizing the installation of the cylindrical structure on the connecting plate.

[0042] The connecting plate is also connected to an outer cover 56 that closes the opening of the encoder connecting frame. The outer cover can have the same diameter as the larger portion of the limiting hole, allowing it to fit within the limiting hole. Alternatively, the outer cover can have a diameter larger than the maximum diameter of the limiting hole, allowing it to fit directly over the limiting hole. Both of these methods can seal the opening of the encoder connecting frame, providing protection for the incremental encoder.

[0043] Assembly of the speed measurement structure: fix the transition plate to the rim, install the incremental encoder in the encoder connecting frame, embed the encoder connecting frame in the limiting hole of the connecting plate and fix it, connect the rotor of the incremental encoder to the transition plate, fix the outer cover plate on the limiting hole, and finally fix the connecting plate to the steering bracket to complete the assembly.

[0044] Among them, such as Figure 4 and Figure 5As shown, the angle measuring structure is arranged in the center hole of the slewing bearing, and the measuring device of the angle measuring structure is an absolute value encoder 61. The absolute value encoder is connected to the steering bracket and can rotate synchronously with the steering bracket. The mounting part of the angle measuring structure is fixedly connected to the forklift frame leg.

[0045] like Figure 4 and Figure 5 As shown, the mounting components of the angle measurement structure include a coupling 62, an encoder bracket 63, and a fixed cover plate 64. A groove is machined on the steering bracket, and the coupling is installed in the groove. The absolute encoder is connected to the encoder bracket, and its rotor passes through the encoder bracket and is connected to the coupling. A mounting hole is provided on the forklift frame leg corresponding to the center hole of the slewing bearing, and the encoder bracket is installed in the mounting hole. The encoder bracket thus fixes the main body of the absolute encoder to the forklift frame leg, and its rotor moves synchronously with the steering bracket through the coupling, thereby achieving the purpose of angle measurement. In the above, the absolute encoder is fixed to the encoder bracket by at least two encoder fixing blocks 65.

[0046] In order to avoid damage to the absolute encoder caused by debris and to facilitate assembly, the encoder bracket preferably adopts a cylindrical structure with an open end, and the opening direction is vertically upward. A circular ring plate extends along the circumference of the cylindrical structure on the outer edge of the open end of the cylindrical structure. The mounting hole is divided into three parts with decreasing diameters from top to bottom. The part close to the slewing bearing is consistent with the diameter of the cylindrical structure, the middle part is consistent with the outer diameter of the circular ring plate, and the uppermost part is consistent with the outer diameter of the fixed cover plate. In this way, the cylindrical structure can be directly inserted into the mounting hole, and then the circular ring plate is fixed in the mounting hole by fasteners; finally, the fixed cover plate is embedded in the largest diameter part in the mounting hole, and the upper end face of the fixed cover plate is set on the same horizontal plane as the upper end face of the forklift frame leg, so as to avoid affecting the use of the frame leg.

[0047] Assembly of the angle measurement structure: According to the position of the center hole of the slewing bearing, the frame legs are processed, and then the steering bracket is processed. The coupling is installed on the steering bracket, and the absolute encoder is installed on the encoder bracket. Then, the rotor of the absolute encoder is connected to the coupling. At this time, the encoder bracket is embedded in the mounting hole, and the circular ring plate is connected through fasteners. Finally, the fixed cover plate is embedded in the mounting hole to complete the installation of the angle measurement structure.

[0048] Improve the second aspect: Combination Figure 1 and Figure 6 To illustrate this aspect:

[0049] like Figure 6 As shown, the slider adjustment structure 70 is used to adjust the distance between two relatively moving structural frames in a forklift. The slider adjustment structure is arranged between the two structural frames. The adjustment between the inner door frame and the outer door frame is used as an example for explanation below.

[0050] The slider adjustment structure is arranged between the outer door frame 23 and the inner door frame 22, and includes a connecting block 71, a guide block 72 and a slider 73 arranged side by side in sequence, wherein the slider is preferably made of metal copper, and the slider is fixed to the guide block by fastening bolts.

[0051] Among them, two guide holes are provided on the guide block, and two guide pins 74 corresponding to the two guide holes are fixed on the side of the connecting block facing the guide block, so that the guide block can move relative to the connecting block. Therefore, further, a jacking bolt 75 is connected to the connecting block to push the guide block so that the guide block moves along the axial direction of the guide pin, so that the movement of the guide block is promoted by the contact between the jacking bolt and the guide block.

[0052] Wherein, the connecting block is fixed on the outer door frame or the inner door frame, and the corresponding slider is close to the inner door frame or the outer door frame, such as Figure 6 As shown, the connecting block is fixed to the outer door frame, the sliding block is tightly attached to the inner door frame, four small screw holes are provided on the outer door frame, and the connecting block is fixed to the outer door frame by four bolts on the four small screw holes; at the same time, two adjustment holes are provided on the outer door frame, and two jacking bolts are provided. The two jacking bolts correspond to the adjustment holes, and the jacking bolts are tightened and loosened through the adjustment holes to achieve adjustment of the jacking bolts. In order to achieve the jacking of the jacking bolts, the length of the jacking bolts needs to be greater than the width of the connecting block.

[0053] Among them, since the guide block and the connecting block can move relative to each other, when no adjustment is required, the guide block may fall off the guide pin shaft or be displaced on the guide pin shaft. For this purpose, a tightening screw hole is provided on the outer door frame, and a tightening bolt 76 is connected to the tightening screw hole, which can pass through the connecting block and be connected to the guide block.

[0054] Adjustment process:

[0055] Install according to the above structure. When adjustment is needed, first loosen the tensioning bolt, and adjust the gap between the guide block and the connecting block by adjusting the jacking bolt, so that the slider on the guide block moves, and the distance between the outer door frame and the inner door frame is adjusted. After the adjustment is completed, retighten the tensioning bolt.

[0056] Improve the third aspect: combine the following Figure 1 and Figure 7 This aspect will be explained.

[0057] like Figure 7 As shown, the dual-cylinder structure includes two cylinders 81, two connecting oil pipes 82, and two oil port joints 83. In order to achieve synchronous extension and retraction of the piston rods in the two cylinders, the structural relationship between the two cylinders, the two connecting oil pipes, and the two oil port joints needs to be optimized as follows:

[0058] The two oil cylinders are connected to each other and arranged parallel to each other. The two oil cylinders have the same size and are aligned at both ends. The two oil cylinders are connected together by welding. The two telescopic ends of the two oil cylinders are respectively fixed to the forklift frame 10 and the forklift mast 20, and the telescopic directions of the two telescopic ends are opposite.

[0059] Among them, the two connecting oil pipes are arranged along the length direction of the two oil cylinders, the two ends of the connecting oil pipes are respectively close to the two ends of the two oil cylinders, and the two connecting oil pipes are respectively connected to the two oil cylinders at the same end along their length direction. At the same time, the two ends of each connecting oil pipe are respectively docked on the two oil cylinders, thereby connecting the two oil cylinders through the two connecting oil pipes and forming two oil circuits.

[0060] Wherein, according to the two oil circuits, the two oil port connectors are installed on both ends of one of the oil cylinders or on the same end of the two oil cylinders. Figure 7 In the middle, two oil port joints are installed at both ends of one of the oil cylinders; Figure 7 The two oil cylinders in the middle are divided into the upper and lower oil cylinders as an example for explanation. The two oil port joints correspond to the extension oil port joint and the retraction oil port joint of the piston rod respectively. When the pressure oil enters from the extension oil port joint, the pressure oil enters the upper oil cylinder and drives the piston rod of the upper cylinder. At this time, the pressure oil enters the upper cylinder and enters the lower oil cylinder along the connecting oil pipe at the same time, synchronously driving the piston rod of the lower oil cylinder. Due to the structural design of the connecting oil pipe, the extension directions of the piston rods of the upper and lower cylinders are opposite at this time, which can form a double stroke movement in the forklift; similarly, when the piston rods of the upper and lower cylinders are in the extended state and need to be retracted, the pressure oil enters from the retraction oil port joint. The pressure oil entering the upper cylinder causes the piston rod to retract. At the same time, the pressure oil entering the upper cylinder enters the lower oil cylinder along the connecting oil pipe, prompting the piston rod of the lower cylinder to retract.

[0061] like Figure 7As shown, the top end of one of the two piston rods of the two oil cylinders is threaded and can be fixedly connected to the forklift frame by thread; at the same time, the top end of the other piston rod is provided with a round hole, and a connecting frame can be installed on the forward moving frame 21 of the forklift door frame, and the piston rod can be connected to the connecting frame by a pin shaft, thereby realizing the fixed connection between the piston rod and the forward moving frame.

[0062] Improvement in the fourth aspect: Combination of the following Figure 1 and Figure 8 This aspect will be explained.

[0063] The steering structure steers the front wheels of the forklift. There are two front wheels, and two corresponding steering structures are provided. Both steering structures use steering cylinders to drive steering, and the oil inlet and outlet modes of the two steering structures are controlled by the oil circuit system to achieve the purpose of synchronous steering of the two front wheels.

[0064] like Figure 8 As shown, the steering structure includes a steering bracket 42, a slewing bearing 41, a steering cylinder 43, a fixed bracket 44, a connecting pin 45, and a front pin 46. The steering cylinder is a long cylinder with pin holes at both ends. The steering structure is connected to the frame leg of the forklift. The frame leg includes a transverse plate 11. The slewing bearing is transversely arranged above the front wheel and fixed to the lower end surface of the transverse plate. The steering bracket is arranged below the slewing bearing and fixed to the slewing bearing. The steering bracket includes a transverse frame connected to the slewing bearing and a vertical frame arranged on one side of the front wheel and connected to the drive motor. The vertical frame is fixed to the transverse frame, thereby completing the connection between the drive motor, the steering bracket, and the leg frame.

[0065] Among them, the fixed bracket includes two mutually parallel transverse connecting plates 441 arranged up and down and parallel to the transverse plate 11, the two transverse connecting plates are fixedly connected to the side surfaces of the forklift frame legs, the steering cylinder is arranged between the fixed bracket and the steering bracket, and the telescopic end of the steering cylinder is connected to one corner end of the transverse frame through the front pin shaft 46, the connecting pin shaft is vertically connected to the two transverse connecting plates, and the fixed end of the steering cylinder is arranged between the two transverse connecting plates and installed on the connecting pin shaft, so as to complete the connection of the steering cylinder, the fixed bracket and the steering bracket.

[0066] Furthermore, a mounting hole is processed at a position of the transverse plate of the forklift frame leg corresponding to the fixed bracket, the connecting pin is connected to the mounting hole and vertically passes through the transverse connecting plate on the upper layer, and the lower end of the connecting pin is connected to the transverse connecting plate on the lower layer, that is, a connecting hole is provided on each of the two transverse connecting plates, and the connecting hole corresponds to the mounting hole. Therefore, during installation, the pin hole of the fixed end of the steering cylinder is aligned with the connecting hole, the connecting pin passes through the mounting hole and the connecting hole from above the frame leg, and finally the connecting pin is connected to the connecting pin on the frame leg. In this way, the purpose of convenient installation and simple disassembly can be achieved.

[0067] In the present invention, in order to strengthen the connection strength between the horizontal frame and the vertical frame, a reinforcing plate is connected to the vertical frame and is arranged below the horizontal frame and fixedly connected to the horizontal frame. A plurality of reinforcing plates can be provided, and an inclined connection is preferably adopted between the reinforcing plates and the horizontal frame to avoid contact with the front wheel; secondly, in order to strengthen the connection strength between the fixed bracket and the frame leg, a reinforcing plate fixedly connected to the forklift frame leg is fixedly connected to the side surfaces of the two horizontal connecting plates, and the reinforcing plate is connected to the horizontal plate and the side edge of the forklift frame leg.

[0068] Steering principle: the piston rod of the steering cylinder is connected to the steering bracket 42 through the front pin shaft 46, and the front wheel is installed on the steering bracket. The steering bracket is connected to the frame leg through the slewing bearing 41, and the steering bracket can rotate freely with the frame leg through the slewing bearing; the cylinder barrel of the steering cylinder is connected to the fixed bracket 44 through the connecting pin shaft 45, and the fixed bracket is welded to the frame leg; when the front wheel actually needs to rotate, the piston rod is extended by supplying pressure oil to the steering cylinder, pushing the steering bracket to rotate, that is, driving the front wheel to rotate. At this time, the steering cylinder swings between the two transverse connecting plates through the connecting pin shaft.

[0069] In order to make the purpose, technical solutions and advantages of the present invention more concise and clear, the present invention is illustrated by the above specific embodiments, which are only used to describe the present invention and should not be understood as limiting the scope of the present invention. It should be pointed out that any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the patent of this invention should be based on the appended claims.

Claims

1. A multifunctional forklift, comprising a vehicle frame (10), a mast (20) and a front wheel (30), wherein the front wheel is rotated by a drive motor (31) connected to one side of a wheel rim (32), and the drive motor is mounted on the vehicle frame via a steering structure (40), the mast comprising a forward frame (21), and the steering structure comprising a slewing bearing (41) and a steering bracket (42), characterized in that: The steering bracket is arranged above the front wheel, and the multifunctional forklift further includes: a speed measuring structure (50) connected to the other side of the rim and connected to the steering bracket for measuring speed, the speed measuring structure (50) comprising a measuring device and a mounting member connected to the measuring device, the measuring device of the speed measuring structure being connected to the other side of the rim and being capable of rotating synchronously with the front wheel, the mounting member of the speed measuring structure being fixedly connected to the steering bracket, the measuring device of the speed measuring structure being an incremental encoder (51); an angle measuring structure (60) being arranged in the center hole of the slewing bearing and connected to the vehicle frame for measuring angles, the angle measuring structure (60) comprising a measuring device and a mounting member connected to the measuring device, the angle measuring structure being arranged in the center hole of the slewing bearing, the measuring device of the angle measuring structure being connected to the steering bracket and being capable of rotating synchronously with the steering bracket, the mounting member of the angle measuring structure being fixedly connected to a frame leg of the vehicle frame, the measuring device of the angle measuring structure being an absolute value encoder (61); A slider adjustment structure (70) is used to adjust the distance between two relatively movable structural frames in a forklift; A double oil cylinder structure (80) has one end fixed to the vehicle frame and the other end connected to the forward moving frame, and is used to increase the moving stroke of the forward moving frame.

2. The multifunctional forklift according to claim 1, characterized in that: The mounting member includes a transition plate (52), an encoder connecting frame (53) and a connecting plate (54), wherein the transition plate is fixedly connected to the wheel rim, the incremental encoder is fixedly connected to the encoder connecting frame, and its rotor passes through the encoder connecting frame and is connected to the transition plate, the encoder connecting frame extends to the outside of the front wheel and is connected to the connecting plate, and the connecting plate is vertically arranged and connected to the steering bracket.

3. The multifunctional forklift according to claim 2, characterized in that: The encoder connecting frame is a cylindrical structure with an opening at one end and a through hole at the other end for the rotor of the incremental encoder to pass through. A circular ring plate (55) extends from the outer edge of the cylindrical structure close to the opening. The connecting plate is provided with a limiting hole for connecting the encoder connecting frame, and the circular ring plate is fixed in the limiting hole. The limiting hole is connected to an outer cover plate for covering the opening of the encoder connecting frame.

4. The multifunctional forklift according to claim 1, characterized in that: The mounting member comprises a coupling (62), an encoder bracket (63) and a fixed cover plate (64); the coupling is fixedly connected to the steering bracket; the absolute encoder is connected to the encoder bracket, and its rotor passes through the encoder bracket and is connected to the coupling; a mounting hole is provided on the frame leg corresponding to the center hole of the slewing bearing; the encoder bracket is connected in the mounting hole; the fixed cover plate is connected in the mounting hole and covers the encoder bracket.

5. The multifunctional forklift according to claim 1, characterized in that: The slider adjustment structure is arranged between two structural frames and includes a connecting block (71), a guide block (72) and a slider (73) arranged side by side in sequence. The slider is fixedly connected to the guide block. The guide block is provided with a guide hole (721). A guide pin (74) corresponding to the guide hole is fixedly connected to the side of the connecting block facing the guide block. The connecting block is connected with a jacking bolt (75) for jacking the guide block so that the guide block moves along the axial direction of the guide pin. The guide block and the connecting block are connected by a loosening bolt (76). The connecting block is fixedly connected to one of the structural frames, and the corresponding slider is tightly attached to the other structural frame.

6. The multifunctional forklift according to claim 1, characterized in that: The double-cylinder structure comprises two oil cylinders (81) connected to each other and arranged in parallel and two connecting oil pipes (82) arranged along the length direction of the two oil cylinders, the two telescopic ends of the two oil cylinders are respectively fixed to the vehicle frame (10) and the forward frame (21), and the telescopic directions of the two telescopic ends are opposite, the two ends of the connecting oil pipes are respectively close to the two ends of the oil cylinders, the same end of the two connecting oil pipes along the length direction is connected to the two oil cylinders, and the two ends of each connecting oil pipe are respectively docked on the two oil cylinders.

7. The multifunctional forklift according to claim 6, characterized in that: The two oil cylinders are provided with two oil port joints (83), which are installed on both ends of one of the oil cylinders or on the same end of the two oil cylinders.

8. The multifunctional forklift according to claim 1, characterized in that: The steering structure also includes a steering cylinder (43), a fixed bracket (44) and a connecting pin (45), wherein the fixed bracket includes two transverse connecting plates (441) arranged above and below and parallel to the transverse plates (11) of the frame legs of the frame, wherein the two transverse connecting plates are fixedly connected to the frame legs, and the telescopic end of the steering cylinder is connected to the steering bracket through a front pin (46), a mounting hole is processed on the transverse plate (11), and the connecting pin is connected to the mounting hole and vertically connected to the two transverse connecting plates, and the fixed end of the steering cylinder is arranged between the two transverse connecting plates and connected to the connecting pin.

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