Heavy-load forklift truck with large tunneling force

Abstract

The utility model provides a large-tunneling-force heavy-load forklift which comprises a large-capacity bucket, a heavy-load wheel, a frame, a high-power engine and a plurality of bucket arms which are transversely arranged on the frame in parallel and are connected with the same bucket. Each bucket arm is provided with one or more steel wire ropes, a movable pulley, a fixed pulley, a steel wire rope guide wheel and a winch, wherein the movable pulley is installed on the bucket and opposite to the bucket arm, the fixed pulley is installed on the bucket arm and corresponds to the movable pulley, and the steel wire rope guide wheel is installed on the bucket arm and the frame to prevent the steel wire ropes from rubbing the bucket arm. One end of the steel wire rope is fixed on the front arm or the bucket, and the steel wire rope is connected to the winch after bypassing the movable pulley on the bucket and the fixed pulley and the guide wheel on the bucket arm. And a large tunneling force forming mechanism consisting of a steel wire rope, a pulley, a winch and a winch driving motor ensures that the bucket cuts in large-resistance loads (deposited material piles and soil mountain bodies) and upturns the front end of the full-load bucket.

Description

Technical Field

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

[0002] Based on production needs and technological progress, large and super-large heavy-duty trucks used in special industries such as mining are constantly being updated. Bulk material transfer trucks with a load of hundreds of tons are already relatively common, and bulk material carriers with a load of thousands of tons are also beginning to emerge. However, the loading shovels used with them cannot keep up with the pace of development. The maximum operating tonnage of the currently available shovels is limited to 75 tons. Under such conditions, in order to not prolong the loading time, multiple shovels can only be used at the same time. Not only is the equipment wasted, but multiple devices interfere with each other, which is prone to safety accidents. In addition, the existing shovels have insufficient excavation force. When the resistance of the shoveled material is too large, it is difficult to cut in, and sometimes the main body of the vehicle moves backward. When the bucket is fully loaded, the upward tipping force is insufficient, wasting the bucket volume.

[0003] There are technical limitations on the basic components of existing shovels in manufacturing large excavation force and heavy load shovels. For example, the maximum support capacity of the existing bucket arm, the specifications of the hydraulic cylinders that match it, the power supply for the excavation and lifting of the bucket front end, and the load limits of the wheels and frames all restrict the development of large excavation force and heavy load shovels. Summary of the invention

[0004] The purpose of the present invention is to provide a heavy-duty shovel with large excavation force to improve the excavation capacity and loading capacity of the bucket, overcome the contradiction that the existing shovel is not compatible with large and super-large bulk material transfer vehicles, and provide efficient loading operation machinery for mines and engineering construction.

[0005] The heavy-duty shovel with large excavation force of the present invention comprises wheels, a frame, a bucket arm, a bucket, an operating room, an engine, a travel transmission system, a travel brake system, a hydraulic system, a control system, and a counterweight. The bucket arm comprises a forearm hinged to the bucket and a rear arm hinged to the forearm. The rear arm is provided with a bucket arm elevation and depression hydraulic cylinder, a bucket arm extension and flexion hydraulic cylinder is provided between the rear arm and the forearm, and a bucket rotation hydraulic cylinder is provided between the forearm and the bucket.

[0006] The improvements made are: enlarging the volume of the bucket, selecting heavy-load wheels, a frame, and a high-power engine, and installing multiple bucket arms connected to the same bucket horizontally and in parallel on the frame; each bucket arm is equipped with a large excavation force forming mechanism consisting of one or more steel wire ropes, a movable pulley installed on the bucket relative to the bucket arm, a fixed pulley installed on the bucket arm corresponding to the movable pulley, a wire rope guide wheel installed on the bucket arm and the frame to prevent the steel wire rope from rubbing against the bucket arm, a winch installed on the frame, and a winch driving motor; one end of the steel wire rope is fixed on the forearm or the bucket, and the steel wire rope is connected to the winch after passing through the movable pulley on the bucket and the fixed pulley and guide wheel on the bucket arm.

[0007] In order to make full use of the extension and rotation space of the front and rear sections of the bucket arms and complete part of the shoveling and loading operations without moving the entire vehicle, a further improvement of the present invention is: a bucket arm bearing frame turntable is installed at the front part of the frame, the bucket arm bearing frame is installed on the turntable, the bucket arm, cab, operating system, winch, winch motor, and counterweight are installed on the bucket arm bearing frame, and the turntable is driven by a hydraulic motor or an electric motor installed on the bucket arm bearing frame or the frame to drive the bucket arm bearing frame to rotate relative to the frame.

[0008] In order to achieve unloading without the bucket tipping over, improve farming efficiency and save energy consumption of bucket movement, the improvement of the bucket of the present invention is as follows: a unloading valve is provided at the rear end of the bucket, the valve is hinged at the rear end of the bucket upper sealing plate, a valve opening and closing hydraulic cylinder is provided between the valve and the forearm, a locking pin is provided at the lower end of the valve, the locking pin is used to close the valve and the rear end of the bucket bottom plate, and a pin-controlled hydraulic cylinder is installed on the valve.

[0009] In order to prevent the bucket from being pushed back by the reaction force during excavation, thereby affecting the excavation depth, the present invention further improves the bucket by providing bucket ground-contacting stop teeth at the rear end of the bucket bottom plate.

[0010] In order to meet the use strength of the bucket, another improvement on the bucket of the present invention is that a pull plate or a pull rod is provided between the upper cover plate and the lower bottom in the bucket at the position corresponding to the bucket arm.

[0011] In order to optimize the structure of the shovel of the present invention, 3-4 steel ropes are preferably used for each bucket arm, and the pulley is provided with wire rope winding grooves corresponding to the number of steel ropes. The number of winches corresponds to the number of bucket arms, and each winch is driven by its own configured hydraulic motor or electric motor.

[0012] In order to meet the support capacity of the shovel truck, especially the front end of the frame, which becomes the load-bearing fulcrum of the whole vehicle when the bucket is digging and fully loaded, the improvement on the shovel truck with the bucket arm bearing frame is that the frame uses a plurality of support units consisting of two axles, a support connecting the two axles, a turntable between the upper end of the support and the frame, and wheels on the two axles to support the frame and the whole vehicle. The turntable is preferably the inner and outer ring turntable used in existing excavators. There is a wheel rolling travel power transmission mechanism and a driving mechanism for the support unit to rotate relative to the frame between the frame and the support unit.

[0013] The whole vehicle engine of the forklift of the present invention is configured with a corresponding number of engines on the frame according to the set forklift load, bucket excavation force index, and the number of support units used to support the frame. The engines respectively drive single or grouped support units and the hydraulic pump and generator on the forklift.

[0014] The preferred structure of the power transmission mechanism for the rolling movement of the wheels in the support unit of the present invention includes: a high-position horizontal transmission shaft driven directly or indirectly by the engine power output shaft, a high-position reversing gearbox fixedly installed above the support unit with a drive axle relative to the frame, a low-position reversing gearbox fixed at the lower end of the support in the support unit, a vertical transmission shaft between the high-position reversing gearbox and the low-position reversing gearbox passing through the support unit, and a low-position horizontal transmission shaft between the low-position reversing gearbox and the drive axle. According to the number of support units with drive axles driven by a set single engine, the length of the high-position horizontal transmission shaft driven by each engine and the number of high-position reversing gearboxes connected are determined. The high and low-position reversing gearboxes reverse the rotational torque through a pair of bevel gears in the box.

[0015] In order to realize the movement of the forklift in various directions on the ground through the rotation angle of the support unit relative to the frame, any one of hydraulic motor drive, worm gear drive, and wire rope pulling is selected as the support unit rotation angle driving mechanism.

[0016] The hydraulic motor drive comprises: a hydraulic motor fixed relative to the frame, a gear ring on the upper end of the support unit turntable or the support, and a transmission gear or gear set between the hydraulic motor and the gear ring.

[0017] Winding wire rope pulling: A wire rope winding groove is machined on the part of the rotating side of the turntable that is exposed to the fixed side or the upper end of the support, or a winding ring with a groove on the outer circumference is assembled, and the opposite ends of the two wire ropes are locked in the wire rope winding groove, or the middle part of a wire rope is locked in the winding groove. The locked wire ropes are wound in opposite directions along the winding groove. After winding to the set number of turns, the ends of the two wire ropes cross and extend in opposite directions on the same side of the turntable. After leaving the required length of the wire rope to be wound according to the set maximum turning angle of the turntable, the two wire rope ends are connected to the pulling hydraulic cylinder, or the two wire rope ends are locked on a pull rod respectively, and the pulling hydraulic cylinder is connected at both ends of the pull rod, or the adjacent pull rods are combined into a long pull rod or connected into a pull rod group with a connector, and the support unit angle pulling hydraulic cylinder is connected at both ends of the pull rod group, and the pulling hydraulic cylinder is connected to the frame. The pull rod is radially constrained on the frame by a member fixed relative to the frame.

[0018] Worm gear drive: worm gear teeth are machined on the part of the rotating side of the turntable that is exposed from the fixed side or on the upper end of the support, or a worm gear ring is installed. A worm gear transmission mechanism housing is installed on the fixed side of the turntable, and the end of the worm is connected to a hydraulic motor, or the worms in adjacent worm gear transmission mechanisms are connected in series to form a worm group with a coupling, and the end of the worm group is connected to a hydraulic motor.

[0019] The power source of the support unit angle driving mechanism uses the full hydraulic steering gear on the existing forklift. The full hydraulic steering gear pressure oil output pipe is connected to the support unit driving hydraulic motor or the wire rope pulling hydraulic cylinder to drive each support unit to rotate in the same direction and synchronously.

[0020] The operation process of the present invention is:

[0021] Start the engine, operate the fully hydraulic steering gear to move the forklift to the working surface, start the hydraulic cylinder on the bucket arm, start the winch to reel in the wire rope, and the bucket cuts into the material pile or the excavated mountain. As the front end of the bucket flips up, the bucket is filled. Start the turntable under the bucket arm support frame and control the bucket arm's pitch, flexion and extension, move the bucket to the top of the loader, start the bucket's unloading valve, and let the load fall into the cargo compartment. Then reverse the process to return the bucket to the working position. Repeat the above process to perform excavation and loading operations.

[0022] The positive effects of the present invention are:

[0023] 1. By increasing the bucket volume, the bucket is supported collaboratively by parallel bucket arms connected to the same enlarged bucket, and the bucket arms that can be realized with existing technology meet the support force required for the large-volume bucket.

[0024] 2. The large excavation force forming mechanism composed of wire rope, pulley, winch and winch drive motor ensures the bucket's cutting into the load with large resistance (sediment pile, soil mountain or soil and rock mixed mountain) and the flipping of the front end of the fully loaded bucket.

[0025] 3. The combination of the frame, turntable and bucket arm provides the bucket arm with a full range of rotation space. When the frame does not move, the bucket can shovel and unload materials in a larger area, which simplifies the control procedure and improves the working efficiency of the forklift.

[0026] 4. The frame support unit composed of wheels, wheel bridges, supports and turntables can meet the heavy load support required by the forklift of the present invention with existing tires and axles. In particular, when the bucket is fully loaded and suspended in the air, the bucket arm is extended, and the load-bearing force is concentrated on the front support position of the frame, the installation method of other wheels on the frame is difficult to ensure the stability and safety of the forklift.

[0027] 5. Based on the above advantages, the present invention can be used not only for loading, but also for earth and stone engineering operations such as pushing earth and stone, leveling sites, and filling pits. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a front view of the working state of a heavy-load shovel truck with a large excavation force and a bucket arm carrier according to the present invention.

[0029] Figure 2 It is a front view of the idle state of the large excavation force heavy-load shovel truck with a bucket arm carrier according to the present invention.

[0030] Figure 3 It is a top view of the idle state of the large excavation force heavy-load shovel truck with a bucket arm carrier according to the present invention.

[0031] Figure 4 This is the front view of the bucket of the present invention.

[0032] Figure 5 This is the front view of the frame support unit of the heavy-duty loader with large tunneling force and a bucket arm carrier of the present invention.

[0033] Figure 6 This is the top view of the frame support unit of the heavy-duty loader with large tunneling force and a bucket arm carrier of the present invention.

[0034] Figure 7 This is the structure diagram of the inner and outer ring type turntable in the frame support unit of the present invention.

[0035] Figure 8 This is the schematic diagram of the configuration of multiple support units under the frame and multiple engines in the present invention.

[0036] Fig. 9 This is the diagram of the wheel rolling power transmission mechanism of the support unit in the present invention.

[0037] Fig.10 This is the diagram of the wire rope pulling drive mechanism for the horizontal rotation angle of the support unit relative to the frame in the present invention.

[0038] Fig.11 This is the diagram of the worm and worm gear drive mechanism for the horizontal rotation angle of the support unit relative to the frame in the present invention.

[0039] Reference numerals: Bucket 1, Wheel 2, Frame 3, Operator's cab 4, Counterweight 5, Front arm 6, Rear arm 7, Closing and locking pin 8, Bucket arm extension and bending hydraulic cylinder 9, Bucket tunneling hydraulic cylinder 10, Bucket arm support turntable 11, Bucket arm carrier 12, Wire rope 13, Movable pulley 14, Fixed pulley 15, Guide wheel group 16, Winch 17, Discharge flap 18, Flap opening and closing hydraulic cylinder 19, Bucket ground contact anti-retreat teeth 20, Low-position horizontal transmission shaft 21, Axle 22, Support 23, Turntable 24, Inner turntable ring 24a, Outer turntable ring 24b, Inner rolling steel balls of the turntable 24c, Engine 25, High-position horizontal transmission shaft 26, High-position reversing gearbox 27, Low-position reversing gearbox 28, Vertical transmission shaft 29, Wire rope winding groove 30, Tie rod 31, Hydraulic motor 32, Worm 33, Wire rope 34, Support unit rotation angle pulling hydraulic cylinder 35, Bucket arm elevation and depression hydraulic cylinder 36, Pulling plate 37. Detailed implementation manners

[0040] Refer to Figure 1 、 Figure 2 、 Figure 3The heavy-duty shovel with large excavation force of the present invention comprises wheels 2, a frame 3, a bucket arm, a bucket 1, an operating room 4, a counterweight 5, an engine 25, a travel transmission system, a travel brake system, a hydraulic system, and a control system. The bucket arm comprises a front arm 6 hinged to the bucket, a rear arm 7 hinged to the front arm 6, a bucket arm lifting and lowering hydraulic cylinder 36 is arranged on the rear arm 7, a bucket arm extending and bending hydraulic cylinder 9 is arranged between the rear arm 7 and the front arm 6, and a bucket excavation hydraulic cylinder 10 is arranged between the front arm 6 and the bucket 1.

[0041] The size of the bucket 4 is selected to be 13 meters long, 6 meters wide, and 5 meters deep (it can shovel 550-600 tons of soil and stone bulk materials with a bulk density of about 1.5 tons / cubic meter), and a bucket arm bearing frame turntable (the existing shield machine turntable) 11 is installed at the front of the frame 3. The bucket arm bearing frame 12 is installed on the turntable 11, and the turntable 11 is driven by a hydraulic motor or an electric motor installed on the bucket arm bearing frame 12 or the frame 3, driving the bucket arm bearing frame 12 to rotate.

[0042] Four bucket arms connected to the same bucket 1 are installed horizontally and in parallel on the bucket arm carrier 12. Each bucket arm is equipped with three steel wire ropes 13, a movable pulley 14 on the bucket relative to the bucket arm, a fixed pulley 15 on the bucket arm forearm 6 corresponding to the movable pulley 14, and a guide wheel 16 on the bucket arm and its carrier to prevent the steel wire rope from rubbing against the bucket arm. A winch 17 and a winch drive motor are installed on the bucket arm carrier 12 to form a large excavation force forming mechanism. The movable pulley 14 is installed in front of the cover plate on the bucket 1, the fixed pulley 15 is installed in the middle and upper part of the forearm 6, and three steel wire rope guide wheels 16 are selected and installed on the outside of the bucket arm bending part and in front of the winch 17 on the bucket arm support frame 12 respectively. One end of the steel wire rope 13 is fixed on the forearm 6 or the bucket 1, and the steel wire rope 13 is connected to the winch 17 after passing through the movable pulley 14 on the bucket 1 and the fixed pulley 15 and guide wheel 16 on the bucket arm. The connection position and the direction of the steel wire rope are as follows: the end of the steel wire rope 13 is fixed to the rear of the movable pulley 14 on the bucket 1, the steel wire rope 13 passes through a steel wire rope winding groove of the fixed pulley, turns to the movable pulley 14, passes through a steel wire rope winding groove of the movable pulley, turns to the fixed pulley group 15, passes through another steel wire rope winding groove on the fixed pulley, and then extends to and passes through each guide wheel, and then is connected to the winch 17. This connection and winding method corresponds to three steel wire ropes, and six steel wire rope winding grooves are required in the fixed pulley 15. The connection position and direction of the wire rope 13 are as follows: the end of the wire rope 13 is fixed above the fixed pulley 15 on the forearm 6, the wire rope 13 extends to the movable pulley 14 and bypasses a surrounding groove, returns to the forearm and bypasses a surrounding groove of the fixed pulley, then extends to and bypasses each guide wheel, and finally connects to the winch 17. This connection and winding method corresponds to three wire ropes 13, and the movable pulley 14 and the fixed pulley 15 have three wire rope surrounding grooves. The wire rope 13 can continue to be wound between the fixed pulley 15 and the movable pulley 14 before extending to the guide wheel. For each additional circle, the surrounding groove on the pulley doubles.

[0043] See also Figure 4 A discharge valve 18 is provided at the rear end of the bucket 1. The discharge valve 18 is hinged at the rear end of the upper cover plate of the bucket 1. A valve opening and closing hydraulic cylinder 19 is provided between the discharge valve 18 and the forearm 6. A locking latch 8 is provided at the lower end of the discharge valve 18. The locking latch 8 is used to close the valve and the rear end of the bucket bottom plate. A latch control hydraulic cylinder is installed in the interlayer of the discharge valve 18.

[0044] In order to prevent the bucket 1 from being pushed back by the reaction force during excavation, thereby affecting the excavation depth, bucket ground-contacting stop teeth 20 are distributed at the rear end of the bucket bottom plate.

[0045] See also Figure 3In order to meet the use strength of the bucket, a pull plate 37 is provided between the upper cover plate and the lower bottom of the bucket 1 at the position corresponding to the bucket arm. The number of winches 17 corresponds to the number of bucket arms, and each winch is driven by a hydraulic motor configured separately.

[0046] See also Figure 5 , Figure 6 , Figure 7 In order to meet the supporting capacity of the overall load-bearing fulcrum of the motor vehicle, especially the front-end forklift, when the bucket is digging and fully loaded, on the forklift with the bucket arm carrier 12, the frame 2 uses multiple support units consisting of two heavy-load axles 22, a support 23 connecting the two axles 22, a turntable 24 between the upper end of the support 23 and the frame 2, and heavy-loaded wheels 2 on the two axles to support the frame and the movement of the whole vehicle. The turntable 24 is preferably an inner and outer ring turntable used in existing excavators (hook machines) (including an inner ring 24a with assembly holes on the circumference and an outer ring 24b with assembly holes on the circumference. Rolling steel balls 24c).

[0047] See also Figure 8 In the present invention, the frame 3 is 11 meters wide and 30 meters long. Eight support units are installed under the frame 3. The engine 25 uses four domestic Shandong Weichai high-horsepower diesel engines (with electronically controlled speed regulators and automatic transmissions). Each engine 25 drives the turntable 24 and wheels 2 on two support units. The electric control buttons of the automatic transmissions of the four diesel engines are fixed on the same axis, or the speed control wires of the four diesel engines are connected to the contact point of a speed control button, so that the four diesel engines can change speed synchronously during operation. The generator on the forklift and the booster pump of the hydraulic system are connected to the engine for driving.

[0048] Referring to 9, the preferred structure of the power transmission mechanism for the wheel rolling in the support unit of the present invention includes: a high-position horizontal transmission shaft 26 driven directly or indirectly by the power output shaft of the engine 25, a high-position reversing gear box 27 fixedly installed above the support unit with the drive axle relative to the frame, a low-position reversing gear box 28 fixed at the lower end of the support in the support unit, a vertical transmission shaft 29 passing through the support unit between the high-position reversing gear box and the low-position reversing gear box, and a low-position horizontal transmission shaft 21 between the low-position reversing gear box and the drive axle. In this embodiment, each engine 25 drives two high-position reversing gear boxes. The high and low-position reversing gear boxes reverse the rotational torque through a pair of bevel gears in the box.

[0049] The hydraulic motor driving mechanism for realizing the rotation angle of the support unit relative to the frame to realize the horizontal movement of the forklift vehicle in different directions includes: a hydraulic motor fixed relative to the frame, a rotating plate of the support unit or a gear ring at the upper end of the support, and a transmission gear or gear set between the hydraulic motor and the gear ring.

[0050] See also Figure 7 , Fig.10The wire rope pulling of the support unit relative to the frame to realize the horizontal movement of the forklift in different directions includes: processing a wire rope winding groove 30 on the part of the rotating side of the turntable 24 of the support unit exposed to the fixed side or the upper end of the support, or assembling a winding ring with a groove on the outer circumference, locking the opposite ends of two wire ropes 34 in the wire rope winding groove 30, or locking the middle part of a wire rope 34 in the wire rope winding groove 30, and the locked wire rope 34 is moved along the wire rope winding groove The ends of the two steel wire ropes 34 are respectively locked on a tie rod 31, and the adjacent tie rods 31 are connected to a tie rod group by a connecting piece, and the supporting unit angle pulling hydraulic cylinder 35 is connected at both ends of the tie rod group, and the pulling hydraulic cylinder 35 is connected to the vehicle frame 3. The tie rod 31 is radially constrained on the vehicle frame 3 by a member fixed relative to the vehicle frame.

[0051] See also Figure 7 , Fig.11 The worm gear drive of the supporting unit relative to the frame to realize the rotation angle of the forklift in different horizontal directions includes: processing worm gear teeth or assembling worm gear rings on the rotating side of the turntable 24 exposed to the fixed side or the upper end of the support, installing a worm gear transmission mechanism housing on the fixed side of the turntable, and installing a worm 33 on the housing. The worms 33 in the adjacent worm gear transmission mechanisms are connected in series to form a worm group with a coupling, and the end of the worm group is connected to a hydraulic motor 32, wherein the worm gear teeth or the assembled worm gear ring are at the same position as the wire rope winding groove 30, which can be Figure 6 The wire rope winding groove 30 is replaced by a worm gear or a worm gear ring, and the wire rope winding groove 30 and the worm gear or the worm gear ring are processed on the exposed position of the rotating disk 24.

Claims

1. A heavy-duty shovel with large excavation force, comprising wheels, a frame, a bucket arm, a bucket, an operating room, an engine, a travel transmission system, a travel brake system, a hydraulic system, a control system, and a counterweight. The bucket arm comprises a forearm hinged to the bucket and a rear arm hinged to the forearm. The rear arm is provided with a bucket arm elevation and depression hydraulic cylinder, a bucket arm extension and flexion hydraulic cylinder is provided between the rear arm and the forearm, and a bucket rotation hydraulic cylinder is provided between the forearm and the bucket. Its characteristics are: A plurality of bucket arms connected to the same bucket are installed horizontally and in parallel on the vehicle frame, and each bucket arm is equipped with a large excavation force forming mechanism consisting of one or more steel wire ropes, a movable pulley installed on the bucket relative to the bucket arm, a fixed pulley installed on the bucket arm corresponding to the movable pulley, a wire rope guide wheel installed on the bucket arm and the vehicle frame to prevent the steel wire rope from rubbing against the bucket arm, a winch installed on the vehicle frame, and a winch driving motor. One end of the steel wire rope is fixed on the forearm or the bucket, and the steel wire rope is connected to the winch after passing through the movable pulley on the bucket and the fixed pulley and guide wheel on the bucket arm.

2. A heavy-duty shovel truck with large excavation force according to claim 1, characterized in that: A bucket arm carrier frame turntable is installed at the front of the vehicle frame, the bucket arm carrier frame is installed on the turntable, the bucket arm, cab, operating system, winch, winch motor, and counterweight are installed on the bucket arm carrier frame, and the turntable is driven by a hydraulic motor or an electric motor installed on the bucket arm carrier frame or the vehicle frame to drive the bucket arm carrier frame to rotate relative to the vehicle frame.

3. A heavy-duty shovel truck with large excavation force according to claim 1, characterized in that: The rear end of the bucket is provided with a discharge valve, which is hinged at the rear end of the bucket upper sealing plate. A valve opening and closing hydraulic cylinder is provided between the valve and the forearm. A locking pin is provided at the lower end of the valve, which is used to close the valve and the rear end of the bucket bottom plate. A pin-controlled hydraulic cylinder is installed on the valve.

4. A heavy-duty shovel truck with large excavation force according to claim 1, characterized in that: The rear end of the bucket bottom plate is provided with bucket ground contact stop teeth.

5. The heavy-duty shovel truck with large excavation force according to claim 1 is characterized in that: A pull plate or a pull rod is arranged between the upper cover plate and the lower bottom in the bucket at a position corresponding to the bucket arm.

6. The heavy-duty shovel truck with large excavation force according to claim 1, characterized in that: Corresponding to each bucket arm, 3-4 wire ropes are used, and the pulley is provided with wire rope winding grooves corresponding to the number of wire ropes. The number of winches corresponds to the number of bucket arms, and each winch is driven by its own configured hydraulic motor or electric motor.

7. The heavy-duty shovel truck with large excavation force according to claim 2, characterized in that: The frame supports the movement of the frame and the entire vehicle using multiple support units consisting of two axles, a support connecting the two axles, a turntable between the upper end of the support and the frame, and wheels on the two axles. Between the frame and the support units, there is a wheel rolling travel power transmission mechanism and a driving mechanism for the support unit to rotate relative to the frame.

8. The heavy-duty shovel truck with large excavation force according to claim 7, characterized in that: According to the set motor vehicle load, bucket excavation force index, and the number of support units supporting the frame, a corresponding number of engines are arranged on the frame, and the engines respectively drive single or grouped support units and the hydraulic pump and generator on the forklift.

9. The heavy-duty shovel truck with large excavation force according to claim 7, characterized in that: The wheel rolling travel power transmission mechanism in the support unit includes: a high-position horizontal transmission shaft driven directly or indirectly by the engine power output shaft, a high-position reversing gear box fixedly installed above the support unit with a drive axle relative to the frame, a low-position reversing gear box fixed at the lower end of the support in the support unit, a vertical transmission shaft between the high-position reversing gear box and the low-position reversing gear box passing through the support unit, and a low-position horizontal transmission shaft between the low-position reversing gear box and the drive axle; according to the set number of support units with drive axles driven by a single engine, the length of the high-position horizontal transmission shaft driven by each engine and the number of high-position reversing gear boxes connected are determined; the high and low-position reversing gear boxes reverse the rotational torque through a pair of bevel gears in the box.

10. The heavy-duty shovel truck with large excavation force according to claim 7, characterized in that: The driving mechanism for the rotation angle of the support unit relative to the frame can be selected from the following: hydraulic motor drive, wire rope pull, worm gear drive: The hydraulic motor drive includes: a hydraulic motor fixed relative to the frame, a gear ring on the upper end of the support unit turntable or the support, and a transmission gear or gear set between the hydraulic motor and the gear ring: Winding wire rope pulling: a wire rope winding groove is processed on the part of the rotating side of the turntable exposed on the fixed side or the upper end of the support, or a winding ring with a groove on the outer circumference is installed, and the opposite ends of the two wire ropes are locked in the wire rope winding groove, or the middle part of a wire rope is locked in the winding groove. The locked wire ropes are wound in opposite directions along the winding groove. After winding to a set number of circles, the ends of the two wire ropes are crossed and extended in opposite directions on the same side of the turntable. After leaving the required length of the wire rope to be wound according to the set maximum turning angle of the turntable, the pulling hydraulic cylinder is connected to the two wire rope ends, or the two wire rope ends are respectively locked on a pull rod, and the pulling hydraulic cylinder is connected at both ends of the pull rod, or the adjacent pull rods are combined into a long pull rod or connected into a pull rod group with a connector, and the support unit corner pulling hydraulic cylinder is connected at both ends of the pull rod group, and the pulling hydraulic cylinder is connected to the frame; the pull rod is radially constrained on the frame by a member fixed relative to the frame; Worm gear drive: worm gear teeth are machined or worm gear rings are installed on the part of the rotating side of the turntable that is exposed to the fixed side or on the upper end of the support, and the worm gear transmission mechanism housing is installed on the fixed side of the turntable. The end of the worm is connected to the hydraulic motor, or the worms in the adjacent worm gear transmission mechanisms are connected in series to form a worm group with a coupling, and the end of the worm group is connected to the hydraulic motor; The power source of the support unit angle driving mechanism uses a full hydraulic steering gear. The full hydraulic steering gear pressure oil output pipe is connected to the support unit driving hydraulic motor or the wire rope pulling hydraulic cylinder to drive each support unit to rotate in the same direction and synchronously.

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