Walking type electric carrier

Abstract

The utility model relates to a walking type electric carrier. The technical problem that an existing carrier is prone to inclination due to the too large steering angle is solved. Comprising a front frame and a rear frame which are detachably connected, bearing wheels are arranged at the end, away from the rear frame, of the front frame, a control rod with an operating system is vertically arranged on the side, away from the front frame, of the upper end of the rear frame, a driving assembly is arranged at the lower end of the rear frame, and a lithium battery is detachably arranged on the side, close to the rear frame, of the front frame. An electrical part and a hydraulic station are arranged in the rear frame, the electrical part is connected with the lithium battery and the operating system, and auxiliary wheel assemblies located on the two sides of the driving assembly are arranged on the two sides of the lower end of the rear frame through auxiliary wheel disassembling and assembling structures respectively. The carrying vehicle has the advantages that by means of the bearing bridge and the auxiliary wheel assembly, when the carrying vehicle steers, the stability of steering movement can be ensured, the phenomenon of inclination and rollover is avoided, and the driving safety of an operator is fully considered.

Description

Technical Field

[0001] The utility model belongs to the technical field of handling vehicle equipment, and particularly relates to a walk-behind electric handling vehicle. Background Art

[0002] Handling vehicles are mainly used for handling various machinery and other heavy objects, and are suitable for handling goods in a small space range. They are a commonly used lifting and handling tool in factory workshops and warehouses at present. Most handling vehicles are manual hydraulic handling vehicles, which are simple to operate and flexible to move. However, their walking and pulling are realized by manpower, which is very labor-consuming. And it is laborious when the ground is uneven, resulting in low handling efficiency. At the same time, the handling vehicle uses a single wheel to control the overall steering action, and it is easy to cause the handling vehicle to lose balance and tilt when the steering angle is too large.

[0003] In order to solve the deficiencies of the existing technology, people have carried out long-term exploration and proposed various solutions. For example, a Chinese patent document discloses a walk-behind electric handling vehicle [202110148011.4], which includes a fork, a lifting drive mechanism, a control mechanism, a power supply mechanism, a walking mechanism, a brake mechanism assembly and a base. The fork is installed on one side of the power supply mechanism, the base is installed on the other side of the power supply mechanism, and the lifting drive mechanism and the control mechanism are installed on the base; the walking mechanism includes walking wheels; the brake mechanism assembly includes an electric motor brake drive mechanism and an electromagnetic brake mechanism, and the electric motor brake drive mechanism and the electromagnetic brake mechanism are respectively installed on both sides of the walking wheels.

[0004] The above solution solves the problem of low handling efficiency of the existing manual handling vehicle to a certain extent, but there are still many deficiencies in this solution. For example, the handling vehicle is prone to tilt when the steering angle is too large and other problems. Summary of the Invention

[0005] The purpose of the utility model is to provide a walk-behind electric handling vehicle for the above problems.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions: a walking electric transport vehicle, comprising a detachably connected front frame and a rear frame, the front frame having a load-bearing wheel at one end away from the rear frame, a control lever with an operating system vertically arranged on the side of the upper end of the rear frame away from the front frame, a drive assembly arranged at the lower end of the rear frame, a lithium battery detachably arranged on the side of the front frame close to the rear frame, electrical components and a hydraulic station arranged in the rear frame, and the electrical components are connected to the lithium battery and the operating system, and auxiliary wheel assemblies located on both sides of the drive assembly are arranged on both sides of the lower end of the rear frame through auxiliary wheel disassembly and assembly structures. The rear frame and the auxiliary wheel assembly are used to provide stability for the steering of the transport vehicle, the structure is compact, the driving safety of the operator is fully considered, and the use effect of the transport vehicle is guaranteed.

[0007] In the above-mentioned pedestrian electric transport vehicle, the rear frame includes a curved load-bearing bridge, the hydraulic station is arranged at the upper end of the load-bearing bridge, the drive assembly is arranged at the lower end of the load-bearing bridge, and the upper end of the drive assembly passes through the load-bearing bridge and is connected to the hydraulic station through a detachable connecting structure.

[0008] In the above-mentioned walking electric transport vehicle, the detachable connection structure includes a drive shaft arranged at the upper end of the drive assembly and passing through the center of the load-bearing bridge, one side of the drive shaft has a drive positioning hole, the lower end of the hydraulic station is provided with a drive sleeve that is mutually plugged with the drive shaft, and one side of the drive sleeve has a drive mounting hole corresponding to the drive positioning hole, and the drive mounting hole and the drive positioning hole are connected by a cylindrical pin. Connecting the drive assembly and the hydraulic station by a cylindrical pin eliminates multiple fixing bolts, making the structure simple and smart.

[0009] In the above-mentioned pedestrian electric transport vehicle, the auxiliary wheel disassembly and assembly structure includes a load-bearing bridge mounting arm formed by bending downwards the two ends of the load-bearing bridge, and the load-bearing bridge mounting arm is provided with a plurality of auxiliary wheel mounting holes in sequence on the side away from the front frame, and the upper end of the auxiliary wheel assembly has a vertically arranged auxiliary wheel mounting arm, and the auxiliary wheel mounting arm is provided with a plurality of auxiliary wheel positioning holes corresponding to the auxiliary wheel mounting holes, and the auxiliary wheel positioning holes are connected to the auxiliary wheel mounting holes by auxiliary wheel mounting screws. The assembly structure is adopted, and it can be replaced in time when damaged, which improves practicality, and at the same time, the auxiliary wheel assembly can play a role in rotation stability, ensuring the driving safety of the transport vehicle.

[0010] In the above-mentioned pedestrian electric transport vehicle, a lifting rod having one end connected to the load-bearing wheel is provided on the inner side of the lower end of the front frame, a connecting rod is provided at the end of the lifting rod away from the load-bearing wheel, and the end of the connecting rod away from the lifting rod is detachably connected to the mounting arm of the load-bearing bridge. The connecting rod plays a role of fixing and connecting the load-bearing bridge.

[0011] In the above-mentioned walk-behind electric forklift truck, a horizontally arranged hydraulic station connection part is provided on one side of the upper end of the front frame. A connection hole is provided inside the lower end of the hydraulic station connection part. The upper end of the hydraulic station is axially inserted into the connection hole and connected by a fixing bolt. The electrical components are arranged on the side of the hydraulic station close to the rear frame, and the lower end of the control lever is movably arranged on the side of the hydraulic station away from the electrical components.

[0012] In the above-mentioned walk-behind electric forklift truck, a battery installation groove is provided on one side of the upper end of the front frame away from the hydraulic station connection part. The lithium battery is arranged in the battery installation groove. Elastic fixing parts that are in contact with both sides of the lithium battery are respectively provided on both sides of the battery installation groove, and a plug-in part connected to the electrical components is provided on one side of the lithium battery. The quick-release lithium battery is adopted. By pulling out the plug-in part, the whole lithium battery can be lifted upward for replacement without repeated disassembly and assembly.

[0013] In the above-mentioned walk-behind electric forklift truck, the operating system includes a control seat arranged at the upper end of the control lever. Handle parts are respectively provided on both sides of one end of the control lever close to the control seat. A start switch is provided at the lower end of the side of the control seat away from the front frame. A driving part is provided above the start switch. A lifting part is provided on the side of the control seat away from the start switch, and a horn button is provided at the upper end of the lifting part. The start switch is used to control the on-off of the vehicle power supply, and the horn button is used to control the warning sound.

[0014] In the above-mentioned walk-behind electric forklift truck, the driving part has a creep button arranged above the start switch. An emergency reverse button is provided at the upper end of the control seat. Accelerator buttons are respectively provided on both sides of the emergency reverse button. The lifting part has a lowering button arranged below the horn button, and a raising button is provided below the lowering button. The accelerator buttons are used to control the forward and backward speed of the vehicle. The emergency reverse button is used to prevent the vehicle from colliding. The lowering button and the raising button are used to control the lifting and lowering of the front frame.

[0015] In the above-mentioned walk-behind electric forklift truck, a hydraulic station protection cover is provided on the outer side of the side of the hydraulic station away from the control lever, and a drive assembly protection cover is provided on the outer side of the side of the load-carrying bridge away from the front frame. The hydraulic station protection cover and the drive assembly protection cover play a protective role. Only by unscrewing the screws on the cover can maintenance be carried out, which is simple, convenient and easy to disassemble and assemble.

[0016] Compared with the existing technology, the advantages of the present utility model are as follows:

[0017] 1. By using the load-carrying bridge and the auxiliary wheel assembly, when the forklift truck turns, the stability of the turning movement can be ensured, and the phenomenon of tilting and overturning can be avoided, fully considering the driving safety of the operator.

[0018] 2. The device adopts a new and convenient driving connection method, connecting the driving assembly and the hydraulic station through a cylindrical pin, eliminating multiple fixing bolts.

[0019] 3. The device is easy to operate, with high strength and safety. At the same time, it is made of integral cast steel, with stable quality, light weight, small and delicate appearance. The front and rear frames can be quickly separated, and there are no electrical control actuators on the front frame, which is convenient for maintenance.

[0020] 4. The hydraulic station and electrical components of the device are integrated on an installation plate. Only by unscrewing the screws on the cover can maintenance be carried out, which is simple, convenient, easy to disassemble and assemble, and at the same time avoids the oil pipe passing through the frame.

[0021] 5. The device adopts a quick-release lithium battery. By pulling out the connector and lifting the whole lithium battery upward, it can be replaced without repeated disassembly and assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic structural diagram of the present utility model.

[0023] Figure 2 is a side view of the present utility model.

[0024] Figure 3 is a schematic structural diagram of the front frame in the present utility model.

[0025] Figure 4 is a schematic structural diagram of the front frame from another perspective in the present utility model.

[0026] Figure 5 is an exploded view of the structure of the carrier bridge and auxiliary wheel assembly in the present utility model.

[0027] Figure 6 is a schematic structural diagram of the control seat in the present utility model.

[0028] Figure 7 is a schematic structural diagram of the control seat from another perspective in the present utility model.

[0029] Figure 8 is a schematic structural diagram of the driving assembly in the present utility model.

[0030] Figure 9 is a schematic structural diagram of the hydraulic station in the present utility model.

[0031] Figure 10 is the Figure 2 enlarged view of the structure at position A in the present utility model.

[0032] In the figure: front frame 1, load-bearing wheels 11, lithium battery 12, lifting rod 13, connecting rod 14, hydraulic station connection part 15, connection hole 16, battery installation groove 17, elastic fixing part 18, plug-in part 19, rear frame 2, drive assembly 21, electrical components 22, hydraulic station 23, auxiliary wheel assembly 24, load-bearing bridge 25, hydraulic station protective cover 26, drive assembly protective cover 27, control lever 3, operating system 31, control seat 32, handle part 33, start switch 34, drive part 35, lifting part 36, horn button 37, creep button 38, emergency reverse button 39, auxiliary wheel disassembly and assembly structure 4, load-bearing bridge installation arm 41, auxiliary wheel installation hole 42, auxiliary wheel installation arm 43, auxiliary wheel positioning hole 44, auxiliary wheel installation screw 45, detachable connection structure 5, drive shaft 51, drive positioning hole 52, drive sleeve 53, drive installation hole 54, cylindrical pin 55, accelerator button 61, down button 62, up button 63. Detailed implementation mode

[0033] The present utility model will be further described in detail below in conjunction with the accompanying drawings and the detailed implementation mode.

[0034] As Figures 1-10 shown, a walking type electric forklift includes a front frame 1 and a rear frame 2 which are detachably connected. One end of the front frame 1 far from the rear frame 2 is provided with load-bearing wheels 11. On the upper end of the rear frame 2, on the side far from the front frame 1, a control lever 3 with an operating system 31 is vertically arranged. At the lower end of the rear frame 2, a drive assembly 21 is provided. On the side of the front frame 1 close to the rear frame 2, a lithium battery 12 is detachably arranged. Inside the rear frame 2, electrical components 22 and a hydraulic station 23 are provided, and the electrical components 22 are connected to the lithium battery 12 and the operating system 31. On both sides of the lower end of the rear frame 2, auxiliary wheel assemblies 24 located on both sides of the drive assembly 21 are provided through an auxiliary wheel disassembly and assembly structure 4. The rear frame 2 and the auxiliary wheel assemblies 24 are used to provide stability for the steering of the forklift. The structure is compact, fully considering the driving safety of the operator and ensuring the use effect of the forklift.

[0035] As Figure 2 shown, the rear frame 2 includes a curved load-bearing bridge 25. The hydraulic station 23 is arranged on the upper end of the load-bearing bridge 25, and the drive assembly 21 is arranged on the lower end of the load-bearing bridge 25. The upper end of the drive assembly 21 passes through the load-bearing bridge 25 and is connected to the hydraulic station 23 through a detachable connection structure 5.

[0036] Combined with Figure 8 , Figure 9 and Figure 10As shown, the detachable connection structure 5 includes a drive shaft 51 disposed at the upper end of the drive assembly 21 and passing through the center of the load-bearing bridge 25, a drive positioning hole 52 is provided on one side of the drive shaft 51, a drive sleeve 53 is provided at the lower end of the hydraulic station 23 and is plugged into the drive shaft 51, and a drive installation hole 54 corresponding to the drive positioning hole 52 is provided on one side of the drive sleeve 53, and the drive installation hole 54 and the drive positioning hole 52 are connected by a cylindrical pin 55. The drive assembly 21 and the hydraulic station 23 are connected by the cylindrical pin 55, and multiple fixing bolts are eliminated, making the structure simple and smart.

[0037] like Figure 5 As shown, the auxiliary wheel disassembly and assembly structure 4 includes a load-bearing bridge mounting arm 41 formed by bending downwards the two ends of the load-bearing bridge 25, and a plurality of auxiliary wheel mounting holes 42 are sequentially arranged on the side of the load-bearing bridge mounting arm 41 away from the front frame 1, and the upper end of the auxiliary wheel assembly 24 has a vertically arranged auxiliary wheel mounting arm 43, and the auxiliary wheel mounting arm 43 is provided with a plurality of auxiliary wheel positioning holes 44 corresponding to the auxiliary wheel mounting holes 42, and the auxiliary wheel positioning holes 44 are connected to the auxiliary wheel mounting holes 42 by auxiliary wheel mounting screws 45. With the assembly structure, it can be replaced in time when damaged, which improves practicality, and at the same time, the auxiliary wheel assembly 24 can play a role in rotation stability, ensuring the driving safety of the transport vehicle.

[0038] like Figure 4 As shown, a lifting rod 13 is provided at the inner side of the lower end of the front frame 1, one end of which is connected to the load-bearing wheel 11, and a connecting rod 14 is provided at the end of the lifting rod 13 away from the load-bearing wheel 11, and the end of the connecting rod 14 away from the lifting rod 13 is detachably connected to the load-bearing bridge mounting arm 41. The connecting rod 14 plays a role of fixing and connecting the load-bearing bridge 25.

[0039] Among them, a hydraulic station connecting part 15 is horizontally arranged on one side of the upper end of the front frame 1, and a connecting hole 16 is arranged on the inner side of the lower end of the hydraulic station connecting part 15. The upper end of the hydraulic station 23 is axially inserted into the connecting hole 16 and is connected by fixing bolts. The electrical component 22 is arranged on the side of the hydraulic station 23 close to the rear frame 2, and the lower end of the control lever 3 is movably arranged on the side of the hydraulic station 23 away from the electrical component 22.

[0040] Combination Figure 3 and Figure 4 As shown, a battery installation slot 17 is provided on the upper end of the front frame 1 away from the hydraulic station connection part 15, and the lithium battery 12 is arranged in the battery installation slot 17. Elastic fixing members 18 are provided on both sides of the battery installation slot 17 to contact the two sides of the lithium battery 12, and a plug-in part 19 connected to the electrical part 22 is provided on one side of the lithium battery 12. A quick-release lithium battery 12 is used, the plug-in part 19 is pulled out, and the entire lithium battery 12 is lifted up for replacement without repeated disassembly and assembly.

[0041] Combination Figure 6 and Figure 7As shown in the figure, the operating system 31 includes a control seat 32 provided at the upper end of the joystick 3. On both sides of one end of the joystick 3 close to the control seat 32, there are respectively handle parts 33. At the lower end of one side of the control seat 32 away from the front frame 1, there is a start switch 34. At the upper end of the start switch 34, there is a drive part 35. On one side of the control seat 32 away from the start switch 34, there is a lifting part 36, and at the upper end of the lifting part 36, there is a horn button 37. The start switch 34 is used to control the on-off of the vehicle power supply, and the horn button 37 is used to control the warning sound.

[0042] Among them, the drive part 35 has a creep button 38 provided at the upper end of the start switch 34. At the upper end of the control seat 32, there is an emergency reverse button 39. On both sides of the emergency reverse button 39, there are respectively accelerator buttons 61. The lifting part 36 has a lowering button 62 provided at the lower end of the horn button 37, and at the lower end of the lowering button 62, there is a raising button 63. The accelerator buttons 61 are used to control the forward and backward speed of the vehicle. The emergency reverse button 39 is used to prevent the vehicle from colliding. The lowering button 62 and the raising button 63 are used to control the lifting and lowering of the front frame 1.

[0043] As Figure 1 shown, on the outer side of one side of the hydraulic station 23 away from the joystick 3, there is a hydraulic station protective cover 26. On the outer side of one side of the load-carrying bridge 25 away from the front frame 1, there is a drive assembly protective cover 27. The hydraulic station protective cover 26 and the drive assembly protective cover 27 play a protective role. Only by unscrewing the screws on the cover can maintenance be carried out, which is simple and convenient and easy to disassemble and assemble.

[0044] The principle of this embodiment is as follows:

[0045] First, turn on the start switch 34. Rotate the accelerator button 61 to control the operation of the drive assembly 21 through the electrical component 22, so that the forklift truck can travel forward and backward. The speed of the forklift truck depends on the rotation degree of the accelerator button 61 and can be controlled according to needs. The braking of the forklift truck can be achieved only by releasing the accelerator button 61. The lowering button 62 and the raising button 63 can control the lifting and lowering of the front frame 1. When steering, it can be achieved only by pulling the vehicle body to the left or right. At the same time, the load-carrying bridge 25 and the auxiliary wheel assembly 24 play a role in stabilizing the steering.

[0046] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the technical field to which the present invention belongs can make various modifications or supplements to the described specific embodiments or use similar methods to replace them, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0047] Although terms such as front frame 1, load-bearing wheel 11, lithium battery 12, lifting rod 13, connecting rod 14, hydraulic station connection part 15, connection hole 16, battery installation groove 17, elastic fixing part 18, plug-in part 19, rear frame 2, drive assembly 21, electrical component 22, hydraulic station 23, auxiliary wheel assembly 24, load-bearing bridge 25, hydraulic station protective cover 26, drive assembly protective cover 27, control lever 3, operating system 31, control seat 32, handle part 33, start switch 34, drive part 35, lifting part 36, horn button 37, turtle speed button 38, emergency reverse button 39, auxiliary wheel disassembly and assembly structure 4, load-bearing bridge mounting arm 41, auxiliary wheel mounting hole 42, auxiliary wheel mounting arm 43, auxiliary wheel positioning hole 44, auxiliary wheel mounting screw 45, detachable connection structure 5, drive shaft 51, drive positioning hole 52, drive sleeve 53, drive mounting hole 54, cylindrical pin 55, accelerator button 61, down button 62, up button 63 are used more frequently in this text, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present utility model; interpreting them as any additional limitation is contrary to the spirit of the present utility model.

Claims

1. A pedestrian electric transport vehicle, comprising a front frame (1) and a rear frame (2) which are detachably connected, wherein the front frame (1) has a load-bearing wheel (11) at one end away from the rear frame (2), a control lever (3) having an operating system (31) is vertically provided on the side of the upper end of the rear frame (2) away from the front frame (1), and a drive assembly (21) is provided at the lower end of the rear frame (2), characterized in that: A lithium battery (12) is detachably provided on one side of the front frame (1) close to the rear frame (2), an electrical component (22) and a hydraulic station (23) are provided in the rear frame (2), and the electrical component (22) is connected to the lithium battery (12) and the operating system (31), and auxiliary wheel assemblies (24) located on both sides of the drive assembly (21) are provided on both sides of the lower end of the rear frame (2) through auxiliary wheel disassembly and assembly structures (4).

2. A pedestrian electric transport vehicle according to claim 1, characterized in that: The rear frame (2) comprises a curved load-bearing bridge (25), the hydraulic station (23) is arranged at the upper end of the load-bearing bridge (25), the drive assembly (21) is arranged at the lower end of the load-bearing bridge (25), and the upper end of the drive assembly (21) passes through the load-bearing bridge (25) and is connected to the hydraulic station (23) via a detachable connection structure (5).

3. A pedestrian electric transport vehicle according to claim 2, characterized in that: The detachable connection structure (5) comprises a drive shaft (51) arranged at the upper end of the drive assembly (21) and passing through the center of the load-bearing bridge (25); one side of the drive shaft (51) has a drive positioning hole (52); the lower end of the hydraulic station (23) is provided with a drive sleeve (53) plugged into the drive shaft (51); one side of the drive sleeve (53) has a drive mounting hole (54) corresponding to the drive positioning hole (52); and the drive mounting hole (54) and the drive positioning hole (52) are connected via a cylindrical pin (55).

4. A pedestrian electric transport vehicle according to claim 2 or 3, characterized in that: The auxiliary wheel disassembly and assembly structure (4) comprises a load-bearing bridge mounting arm (41) formed by bending downwardly at both ends of the load-bearing bridge (25); a plurality of auxiliary wheel mounting holes (42) are sequentially arranged on a side of the load-bearing bridge mounting arm (41) away from the front frame (1); the upper end of the auxiliary wheel assembly (24) comprises an auxiliary wheel mounting arm (43) arranged vertically; the auxiliary wheel mounting arm (43) is provided with a plurality of auxiliary wheel positioning holes (44) corresponding to the auxiliary wheel mounting holes (42) one by one, and the auxiliary wheel positioning holes (44) are connected to the auxiliary wheel mounting holes (42) via auxiliary wheel mounting screws (45).

5. A pedestrian electric transport vehicle according to claim 4, characterized in that: A lifting rod (13) having one end connected to the load-bearing wheel (11) is provided on the inner side of the lower end of the front frame (1), a connecting rod (14) is provided on the end of the lifting rod (13) away from the load-bearing wheel (11), and the end of the connecting rod (14) away from the lifting rod (13) is detachably connected to the load-bearing bridge mounting arm (41).

6. The electric walk-behind transport vehicle according to claim 1, characterized in that: A hydraulic station connection portion (15) is disposed transversely on one side of the upper end of the front frame (1), a connection hole (16) is disposed on the inner side of the lower end of the hydraulic station connection portion (15), the upper end of the hydraulic station (23) is axially inserted into the connection hole (16) and connected via fixing bolts, the electrical component (22) is disposed on a side of the hydraulic station (23) close to the rear frame (2), and the lower end of the control lever (3) is movably disposed on a side of the hydraulic station (23) away from the electrical component (22).

7. The pedestrian electric transport vehicle according to claim 6, characterized in that: A battery mounting groove (17) is provided on the upper end of the front frame (1) away from the hydraulic station connection part (15), and the lithium battery (12) is arranged in the battery mounting groove (17). Elastic fixing parts (18) in contact with the two sides of the lithium battery (12) are respectively provided on both sides of the battery mounting groove (17), and a connector (19) connected to the electrical part (22) is provided on one side of the lithium battery (12).

8. The electric walk-behind transport vehicle according to claim 1, characterized in that: The operating system (31) comprises a control seat (32) arranged at the upper end of the control rod (3); the control rod (3) is provided with handles (33) on both sides of one end close to the control seat (32); a start switch (34) is provided at the lower end of the control seat (32) away from the front frame (1); a driving part (35) is provided at the upper end of the start switch (34); a lifting part (36) is provided at the side of the control seat (32) away from the start switch (34); and a horn button (37) is provided at the upper end of the lifting part (36).

9. The electric walk-behind transport vehicle according to claim 8, characterized in that: The driving part (35) has a turtle speed button (38) arranged at the upper end of the start switch (34), the upper end of the control seat (32) is provided with an emergency reverse button (39), and accelerator buttons (61) are respectively arranged on both sides of the emergency reverse button (39), and the lifting part (36) has a descending button (62) arranged at the lower end of the horn button (37), and an ascending button (63) is arranged at the lower end of the descending button (62).

10. The electric walk-behind transport vehicle according to claim 2, characterized in that: A hydraulic station protection cover (26) is provided on the outer side of the hydraulic station (23) away from the control lever (3), and a drive assembly protection cover (27) is provided on the outer side of the load-bearing bridge (25) away from the front frame (1).

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