CN209872255U - Hand-operated fork lift truck - Google Patents

Abstract

The utility model relates to a fork truck discloses a hand-operated fork truck, which comprises a truck frame, a fork frame and a manual lifting mechanism for realizing the lifting of the fork frame, wherein the manual lifting mechanism comprises a first pulley, a chain seat, a second pulley and a hand-operated mechanism, a chain is fixed on the chain seat, the hand-operated mechanism comprises a fixed plate fixed on the truck frame, a long shaft, a braking seat and a speed regulating seat, the braking seat is arranged at the two ends of the long shaft and used for braking the long shaft, and the speed regulating seat is used for regulating the rotating speed of the long shaft; a hoisting chain wheel connected with a chain is arranged on the long shaft and between the brake seat and the speed regulating seat, and the hoisting chain wheel further comprises a hand-operated rod fixed on the brake seat. The utility model discloses a hand mechanism realizes the rising or the decline of fork frame, can effectively practice thrift the cost, sets up the braking seat that is used for the braking and is used for adjusting the regulation seat that is in hand mechanism simultaneously, can carry out effectual control to the lifting position and the amplitude of rise of fork.

Description

Hand-operated fork lift truck

Technical Field

The utility model relates to a pile high car, especially relate to a hand is pulled and is piled high car.

Background

The stacking vehicle is various wheel type carrying vehicles for loading, unloading, stacking and short-distance transportation of finished pallet goods. The fork truck has simple structure, flexible operation, good jogging performance and high explosion-proof safety performance. The tray loading and unloading device is suitable for operation in narrow passages and limited spaces, is ideal equipment for loading and unloading trays in elevated warehouses and workshops, can be widely applied to industries such as petroleum, chemical engineering, pharmacy, light textile, military industry, paint, pigment, coal and the like, and places containing explosive mixtures such as ports, railways, goods yards, warehouses and the like, and can enter cabins, carriages and containers for loading, unloading, stacking and carrying of tray goods. The fork truck can greatly improve the working efficiency, reduce the labor intensity of workers and win the opportunity of market competition for enterprises.

The existing fork truck generally adopts hydraulic lifting, and the fork truck has higher cost; the prior art also has some manual fork lift trucks, and the lifting position and the lifting amplitude of the fork are difficult to control by the current manual fork lift trucks.

SUMMERY OF THE UTILITY MODEL

The utility model provides a hand is pulled and is piled high car to the problem that piles high car elevating system exists among the prior art.

In order to solve the technical problem, the utility model discloses a following technical scheme can solve:

the hand-operated fork truck comprises a truck frame, wherein a fork frame capable of lifting is arranged on the truck frame, the hand-operated fork truck further comprises a manual lifting mechanism for realizing the lifting of the fork frame, the manual lifting mechanism comprises a first pulley and a chain seat which are fixed at the top end part of the truck frame, a second pulley which is fixed on the fork frame, and a hand-operated mechanism which is fixed in the middle of the truck frame, a chain is fixed on the chain seat, one end of the chain is fixed on the chain seat, and the other end of the chain sequentially penetrates through the second pulley and the first pulley and then is connected to the hand-operated mechanism; the hand-operated mechanism comprises a fixing plate fixed on the frame through screws, a long shaft, a braking seat and a speed regulating seat, wherein the braking seat is arranged at two ends of the long shaft and used for braking the long shaft, the speed regulating seat is used for regulating the rotating speed of the long shaft, a connecting shaft which is the same as the long shaft in the axial direction is fixed between the braking seat and the speed regulating seat, a connecting seat is fixed on the connecting shaft, one end of the connecting seat is fixed on the connecting shaft, and the other end of the connecting seat is fixed on; the long shaft is provided with a hoisting chain wheel connected with a chain between the brake seat and the speed regulation seat, and the hoisting chain wheel further comprises a brake nut fixed on the brake seat, and the brake nut is connected with a hand lever. The fork arm lifting mechanism has the advantages that the fork arm frame can ascend or descend through the hand-operated mechanism, cost can be effectively saved, meanwhile, the hand-operated mechanism is internally provided with the braking seat for braking and the adjusting seat for adjusting, and the lifting position and the lifting amplitude of a fork can be effectively controlled.

Preferably, the brake seat comprises a brake mounting plate and a brake seat shell fixed on the brake mounting plate, torsion spring shafts are fixed at the upper and lower ends of the brake mounting plate in the brake seat shell, each torsion spring shaft is provided with a torsion spring and a pawl connected with the torsion spring, a brake block, a ratchet wheel capable of being meshed with the pawl and a brake nut seat are sequentially arranged on the long shaft from the inner side surface of the brake mounting plate to the installation position of the hand rocker, the long shaft is further provided with two friction plates which are respectively arranged between the brake block and the ratchet wheel and between the ratchet wheel and the brake nut seat, and the brake nut is fixed at the end part, far away from the ratchet wheel. The ratchet wheel is firmly buckled through the pawl, and the relative braking is generated between the ratchet wheel and the friction plate, so that the long shaft cannot rotate continuously, the fork frame stops at any time, and the phenomenon of sliding down cannot occur.

Preferably, the speed regulation seat comprises a speed regulation mounting plate and a speed regulation seat shell fixed on the speed regulation mounting plate, gear shafts are respectively fixed at the upper end and the lower end of the speed regulation seat shell, which are positioned on the speed regulation mounting plate, first shaft teeth are arranged on the gear shafts, and the front end parts of the first shaft teeth, which are far away from the speed regulation mounting plate, are connected with first gears with internal teeth in a meshing manner; a gear ring is arranged in the speed regulating seat shell and positioned on the long shaft, a second gear with internal teeth is meshed outside the gear ring, and the external teeth of the second gear are meshed with the rear end parts of the shaft teeth of the two gear shafts; and a second shaft tooth is arranged at the end part of the long shaft, which is far away from the speed regulation mounting plate, and the second shaft tooth is meshed with the external teeth of the two first gears. The outer diameter of the first gear is smaller than that of the second gear, transmission of a final hoisting chain wheel is achieved through meshing of different gears on the speed regulating seat, on one hand, transmission stability of the hoisting chain wheel can be effectively guaranteed, on the other hand, the rotating speed of the hoisting chain wheel can be controlled according to the freight weight of the fork frame, and then stable rising or falling of the fork frame is guaranteed.

Preferably, a steel sleeve is fixed to both the end of the gear shaft away from the speed regulation mounting plate and the end of the long shaft away from the speed regulation mounting plate. The steel bushing can limit the gear shaft and the gear on the long shaft, so that the gear is prevented from being disengaged from the shaft, and the structural stability of the transmission mechanism is ensured.

Preferably, the braking device further comprises a plurality of supporting rods fixed between the speed regulation seat and the braking seat, two ends of each supporting rod are respectively fixed on the speed regulation seat and the braking seat through bolts, a chain guide block is fixed on each supporting rod, and a chain guide groove for a chain to pass through is formed in each chain guide block.

Preferably, the chain wheel brake device further comprises a guide chain wheel fixed between the speed regulation seat and the brake seat, wherein the guide chain wheel comprises two wheel bodies and an annular concave shoulder arranged between the two wheel bodies and used for clamping a chain.

The chain guide block and the chain guide wheel can effectively increase the stability of the chain transmission process, avoid the chain from derailing and ensure the stable rising or falling of the fork frame.

Preferably, hand mechanism still includes the shell body, and the upper and lower both ends of fixed plate are fixed with first board and second board respectively, and fixed plate, first board and second board constitute the posterior lateral plate of shell body jointly, and the upper end bending type of first board becomes first horizontal plate, and the lower tip bending type of second board becomes second horizontal plate, and first horizontal plate constructs the upper end plate and the lower end plate of shell body respectively with the second horizontal plate, still including fixing posterior lateral plate on and left side board and the right side board that forms by the bending type of anterior lateral plate both sides, offer the opening that supplies the brake nut to pass on the anterior lateral plate, offer the chain hole that supplies the chain to pass on the upper end plate. Hand mechanism sets up the shell body, sets up hand mechanism's drive disk assembly inside the shell body, can play effectual guard action to drive mechanism, increases drive disk assembly's life, also can increase whole heap height car's pleasing to the eye degree simultaneously.

Preferably, the fork frame is fixed with a second pulley holder, the second pulley holder comprises a bottom plate fixed on the fork frame, two side plates fixed on the bottom plate and perpendicular to the bottom plate, and a front end plate connected to the end portion of the side plate far away from the bottom plate and opposite to the bottom plate, a U-shaped clamping groove is formed in the end portion of the side plate far away from the bottom plate, and protruding blocks clamped into the U-shaped clamping grooves are respectively arranged at two ends of the front end plate. The second pulley seat is formed by adopting detachable assembly, so that the second pulley can be conveniently assembled and disassembled, the second pulley can be conveniently overhauled and replaced, and meanwhile, the chain can be more conveniently assembled on the second pulley and the installation position is more accurate.

Preferably, a pulley shaft is arranged between the bottom plate and the front end plate, and the second pulley is arranged on the pulley shaft; a pulley guide plate with the upper end part in a semicircular groove shape is also fixed between the two side plates and on the inner side surface of the side plate. The effect of pulley deflector can make the second pulley more stable when carrying out the transmission to the chain, avoids the chain derail, guarantees the stable rising or the decline of fork frame.

Preferably, the bottom end of the frame is provided with two universal wheels. The universal wheel can be convenient for pile the removal of high car, realizes high-efficient, the convenient transport of goods.

Drawings

Fig. 1 is a schematic structural view of embodiment 1 of the present invention.

Fig. 2 is a schematic structural view of the hand-operated mechanism in fig. 1.

Fig. 3 is a cross-sectional view of the hand-operated mechanism of fig. 1.

Fig. 4 is a schematic view of the internal structure of the hand-operated mechanism of fig. 2.

Fig. 5 is another internal schematic view of the hand-operated mechanism of fig. 2.

Fig. 6 is a schematic structural view of the outer case of fig. 1.

Fig. 7 is a schematic structural diagram of the chain guide block in fig. 2.

Fig. 8 is a schematic view of the construction of the guide sprocket of fig. 2.

Fig. 9 is a schematic structural view of the second pulley holder in fig. 1.

Fig. 10 is a schematic view of the second pulley block of fig. 9 with the second pulley and the front end plate removed.

The names of the parts indicated by the numerical references in the drawings are as follows: 1-vehicle frame, 2-fork frame, 3-manual lifting mechanism, 301-first pulley, 302-chain seat, 303-second pulley, 304-hand-operated mechanism, 305-chain, 306-fixed plate, 307-long shaft, 308-brake seat, 309-speed regulation seat, 310-connecting shaft, 311-connecting seat, 312-hoisting sprocket, 313-brake nut, 314-hand-operated rod, 315-brake mounting plate, 316-brake seat shell, 317-torsion spring shaft, 318-torsion spring, 319-pawl, 320-brake block, 321-ratchet wheel, 322-brake nut seat, 323-friction plate, 324-speed regulation mounting plate, 325-speed regulation seat shell, 326-gear shaft, 327-first shaft tooth, 328-first gear, 329-gear ring, 330-second gear, 331-second shaft tooth, 332-steel sleeve, 333-supporting rod, 334-guide chain block, 335-guide chain groove, 336-guide chain wheel, 337-first shaft tooth, 338-annular shoulder, 339-outer shell, 340-first plate, 341-second plate, 342-first horizontal plate, 343-second horizontal plate, 344-front side plate, 345-left side plate, 346-right side plate, 347-opening, 348-chain hole, 349-second pulley seat, 350-bottom plate, 351-side plate, 352-front end plate, 353-U-shaped clamping groove, 354-protruding block, 355-pulley shaft, 356-pulley guide plate, 357-universal wheel.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

Example 1

The hand-operated fork truck is shown in fig. 1-10, and comprises a truck frame 1, a fork frame 2 capable of lifting is arranged on the truck frame 1, and a hand-operated lifting mechanism 3 for lifting the fork frame 2, wherein the hand-operated lifting mechanism 3 comprises a first pulley 301 and a chain seat 302 fixed at the top end of the truck frame 1, a second pulley 303 fixed on the fork frame 2, and a hand-operated mechanism 304 fixed at the middle part of the truck frame 1, a chain 305 is fixed on the chain seat 302, one end of the chain 305 is fixed on the chain seat 302, and the other end of the chain 305 sequentially passes through the second pulley 303 and the first pulley 301 and then is connected to the hand-operated mechanism 304; the hand-operated mechanism 304 comprises a fixing plate 306 fixed on the vehicle frame 1 through screws, and further comprises a long shaft 307, a braking seat 308 and a speed regulating seat 309, wherein the braking seat 308 is arranged at two ends of the long shaft 307 and used for braking the long shaft 307, the speed regulating seat 309 is used for regulating the rotating speed of the long shaft 307, a connecting shaft 310 which is axially identical to the long shaft 307 is fixed between the braking seat 308 and the speed regulating seat 309, a connecting seat 311 is fixed on the connecting shaft 310, one end of the connecting seat 311 is fixed on the connecting shaft 310, and the other end of the connecting seat 311 is fixed; a hoisting chain wheel 312 connected with the chain 305 is arranged on the long shaft 307 and between the brake seat 308 and the speed regulating seat 309, and the hoisting chain wheel further comprises a brake nut 313 fixed on the brake seat 308, and the brake nut 313 is connected with a hand lever 314. The long shaft 307 is driven to rotate by the rotation of the hand lever 314, and the lifting chain wheel 312 is driven to rotate by the rotation of the long shaft 307, so that the transmission of the chain 305 is realized, and the fork frame 2 can ascend or descend.

In this embodiment, the brake seat 308 includes a brake mounting plate 315 and a brake seat housing 316 fixed on the brake mounting plate 315, a torsion spring shaft 317 is fixed at both the upper and lower ends of the brake mounting plate 315 in the brake seat housing 316, a torsion spring 318 and a pawl 319 connected to the torsion spring 318 are disposed on the torsion spring shaft 317, a brake block 320, a ratchet 321 capable of meshing with the pawl 319 and a brake nut seat 322 are sequentially disposed on the long shaft 307 from the inner side of the brake mounting plate 315 to the mounting position of the hand lever 314, the long shaft 307 is further provided with two friction plates 323, the two friction plates 323 are respectively disposed between the brake block 320 and the ratchet 321 and between the ratchet 321 and the brake nut seat 322, and the brake nut 313 is fixed at the end of the brake nut seat 322 far. The hand lever 314 can drive the chain 305 to move by shaking, so that the fork frame 2 can ascend or descend, when braking is needed, the pawl 319 can firmly fasten the ratchet 321, the rotation of the ratchet 321 is avoided, relative braking is also generated between the ratchet 321 and the friction plate 323, so that the long shaft 307 cannot rotate continuously, the fork frame 2 can be stopped at any time, and the phenomenon of sliding down is avoided.

In this embodiment, the speed-adjusting base 309 includes a speed-adjusting mounting plate 324 and a speed-adjusting base housing 325 fixed on the speed-adjusting mounting plate 324, a gear shaft 326 is fixed at each of the upper and lower ends of the speed-adjusting mounting plate 324 in the speed-adjusting base housing 325, a first shaft tooth 327 is provided on the gear shaft 326, and a first gear 328 with internal teeth is engaged and connected to the front end of the first shaft tooth 327 away from the speed-adjusting mounting plate 324; a gear ring 329 is arranged in the speed regulation seat shell 325 and positioned on the long shaft 307, a second gear 330 with internal teeth is meshed outside the gear ring 329, and the external teeth of the second gear 330 are meshed with the rear end parts of the shaft teeth of the two gear shafts 326; the end of the long shaft 307 far away from the speed regulation mounting plate 324 is provided with a second shaft tooth 331, and the second shaft tooth 331 is meshed with the external teeth of the two first gears 328. The end of the gear shaft 326 remote from the governor mounting plate 324 and the end of the long shaft 307 remote from the governor mounting plate 324 are each secured with a steel sleeve 332. Set up a plurality of gears in the speed governing seat 309, the major axis rotates under the effect of hand rocker, thereby make the second axle tooth 331 of major axis tip drive two first gears 328 and rotate, can drive two gear shafts 326 and rotate after two first gears 328 rotate, can drive second gear 330 through first axle tooth 327 on the gear shaft 326 after two gear shafts 326 rotate and rotate, can realize the regulation of major axis 307 rotation speed and moment of torsion through ring gear 329 after second gear 330 rotates, reach even the loading capacity difference of fork frame 2 of realization that can be stable of piling high car rising or decline.

The embodiment further comprises a plurality of supporting rods 333 fixed between the speed regulation seat 309 and the brake seat 308, two ends of each supporting rod 333 are respectively fixed on the speed regulation seat 309 and the brake seat 308 through bolts, a chain guide block 334 is fixed on each supporting rod 333, and a chain guide groove 335 for the chain 305 to pass through is formed in the chain guide block 334. The chain guiding device further comprises a chain guiding wheel 336 fixed between the speed adjusting seat 309 and the braking seat 308, wherein the chain guiding wheel 336 comprises two wheel bodies 337 and an annular concave shoulder 338 arranged between the two wheel bodies 337 for the chain 305 to be clamped in. In this embodiment, four support rods 333 are uniformly arranged around the lifting sprocket 312, and chain guide blocks 334 of the four support rods 333 interact with each other together, so that the chain 305 keeps a correct track transmission, and the stability, safety and smoothness of the ascending or descending of the fork carriage 2 are ensured.

In this embodiment, the hand-operated mechanism 304 further includes an outer casing 339, the upper end and the lower end of the fixing plate 306 are respectively fixed with a first plate 340 and a second plate 341, the fixing plate 306, the first plate 340 and the second plate 341 jointly constitute a rear side plate of the outer casing 339, the upper end of the first plate 340 is bent to form a first horizontal plate 342, the lower end of the second plate 341 is bent to form a second horizontal plate 343, the first horizontal plate 342 and the second horizontal plate 343 are respectively constituted as an upper end plate and a lower end plate of the outer casing 339, and further includes a front side plate 344 fixed on the rear side plate and a left side plate 345 and a right side plate 346 bent from two sides of the front side plate 344, the front side plate 344 is provided with an opening 347 for the brake nut 313 to pass through, and the upper end plate is provided with a chain hole 348 for the chain.

In this embodiment, the fork frame 2 is fixed with a second pulley seat 349, the second pulley seat 349 includes a bottom plate 350 fixed on the fork frame 2, two side plates 351 fixed on the bottom plate 350 and perpendicular to the bottom plate 350, and a front end plate 352 connected to the end portion of the side plate 351 far away from the bottom plate 350 and opposite to the bottom plate 350, the end portion of the side plate 351 far away from the bottom plate 350 is provided with a U-shaped clamping groove 353, and two ends of the front end plate 352 are respectively provided with a protrusion 354 clamped into the U-shaped clamping groove 353. A pulley shaft 355 is arranged between the bottom plate 350 and the front end plate 352, and the second pulley 303 is arranged on the pulley shaft 355; a pulley guide plate 356 having a semicircular groove-shaped upper end is fixed between the two side plates 351 and on the inner side surface of the side plate 351.

In this embodiment, the bottom end portion of frame 1 is equipped with two universal wheels 357, is convenient for then pile the removal of high car, realizes high-efficient, the convenient transport of goods.

Set up speed governing seat 309 and brake seat 308 in manual elevating system 3 in this embodiment, collect multi-functionally as an organic whole with manual elevating system 3, the lift demand of fully provided fork truck, and compact structure, complete an organic whole between each spare part, when the installation only need with manual elevating system 3 install on frame 1 can, need not to install many times, can effectively avoid spare part to lose and install loaded down with trivial details problem, also be convenient for pack, the transportation before the fork truck assembles simultaneously.

In short, the above description is only a preferred embodiment of the present invention, and all the equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the scope of the present invention.

Claims (10)

1. Hand is pulled and is piled high car, including frame (1), be equipped with fork frame (2) that can go up and down on frame (1), its characterized in that: the lifting device is characterized by further comprising a manual lifting mechanism (3) used for achieving lifting of the fork frame (2), wherein the manual lifting mechanism (3) comprises a first pulley (301) and a chain seat (302) which are fixed to the top end of the frame (1), a second pulley (303) which is fixed to the fork frame (2) and a hand-operated mechanism (304) which is fixed to the middle of the frame (1), a chain (305) is fixed to the chain seat (302), one end of the chain (305) is fixed to the chain seat (302), and the other end of the chain (305) penetrates through the second pulley (303) and the first pulley (301) in sequence and then is connected to the hand-operated mechanism (304); the hand-operated mechanism (304) comprises a fixing plate (306) fixed on the frame (1) through screws, a long shaft (307), a braking seat (308) which is arranged at two ends of the long shaft (307) and used for braking the long shaft (307) and a speed regulating seat (309) used for regulating the rotating speed of the long shaft (307), a connecting shaft (310) which is the same as the long shaft (307) in the axial direction is fixed between the braking seat (308) and the speed regulating seat (309), a connecting seat (311) is fixed on the connecting shaft (310), one end of the connecting seat (311) is fixed on the connecting shaft (310), and the other end of the connecting seat (311) is fixed on the fixing plate (306); a hoisting chain wheel (312) connected with the chain (305) is arranged on the long shaft (307) and between the brake seat (308) and the speed regulating seat (309), the speed regulating device also comprises a brake nut (313) fixed on the brake seat (308), and the brake nut (313) is connected with a hand lever (314).

2. The hand truck according to claim 1, wherein: the brake seat (308) comprises a brake mounting plate (315) and a brake seat shell (316) fixed on the brake mounting plate (315), the brake seat shell (316) is internally provided with torsion spring shafts (317) which are respectively fixed at the upper end and the lower end of the brake mounting plate (315), the torsion spring shafts (317) are provided with torsion springs (318) and pawls (319) connected with the torsion springs (318), the long shafts (307) are sequentially provided with brake blocks (320) from the inner side of the brake mounting plate (315) to the mounting position of the hand-operated lever (314), the brake device comprises a ratchet wheel (321) capable of being meshed with a pawl (319) and a brake nut seat (322), wherein two friction plates (323) are further arranged on a long shaft (307), the two friction plates (323) are respectively arranged between a brake block (320) and the ratchet wheel (321) and between the ratchet wheel (321) and the brake nut seat (322), and a brake nut (313) is fixed at the end part, far away from the ratchet wheel (321), of the brake nut seat (322).

3. The hand truck according to claim 1, wherein: the speed regulation seat (309) comprises a speed regulation mounting plate (324) and a speed regulation seat shell (325) fixed on the speed regulation mounting plate (324), a gear shaft (326) is respectively fixed in the speed regulation seat shell (325) and positioned at the upper end and the lower end of the speed regulation mounting plate (324), a first shaft tooth (327) is arranged on the gear shaft (326), and a first gear (328) with internal teeth is connected to the front end part of the first shaft tooth (327) far away from the speed regulation mounting plate (324) in a meshing manner; a gear ring (329) is arranged in the speed regulating seat shell (325) and positioned on the long shaft (307), a second gear (330) with internal teeth is meshed outside the gear ring (329), and the external teeth of the second gear (330) are meshed with the rear end parts of the shaft teeth of the two gear shafts (326); and a second shaft tooth (331) is arranged on the end part of the long shaft (307) far away from the speed regulation mounting plate (324), and the second shaft tooth (331) is meshed with the external teeth of the two first gears (328).

4. The hand truck according to claim 3, wherein: a steel sleeve (332) is fixed to the end of the gear shaft (326) far away from the speed regulation mounting plate (324) and the end of the long shaft (307) far away from the speed regulation mounting plate (324).

5. The hand truck according to claim 3, wherein: the speed regulation device is characterized by further comprising a plurality of supporting rods (333) fixed between the speed regulation seat (309) and the brake seat (308), two ends of each supporting rod (333) are fixed to the speed regulation seat (309) and the brake seat (308) through bolts respectively, a chain guide block (334) is fixed to each supporting rod (333), and a chain guide groove (335) for a chain (305) to pass through is formed in each chain guide block (334).

6. The hand truck according to claim 5, wherein: the speed regulation device further comprises a guide chain wheel (336) fixed between the speed regulation seat (309) and the brake seat (308), wherein the guide chain wheel (336) comprises two wheel bodies (337) and an annular concave shoulder (338) arranged between the two wheel bodies (337) and used for clamping the chain (305).

7. The hand truck according to claim 1, wherein: the hand-operated mechanism (304) also comprises an outer shell (339), the upper end and the lower end of the fixing plate (306) are respectively fixed with a first plate (340) and a second plate (341), the fixing plate (306), the rear side plate of the outer shell (339) is formed by the first plate (340) and the second plate (341) together, the upper end of the first plate (340) is bent to form a first horizontal plate (342), the lower end of the second plate (341) is bent to form a second horizontal plate (343), the first horizontal plate (342) and the second horizontal plate (343) are respectively formed to be an upper end plate and a lower end plate of the outer shell (339), the rear side plate further comprises a front side plate (344) fixed on the rear side plate and a left side plate (345) and a right side plate (346) formed by bending two sides of the front side plate (344), an opening (347) for the brake nut (313) to pass through is formed in the front side plate (344), and a chain hole (348) for the chain (305) to pass through is formed in the upper end plate.

8. The hand truck according to claim 1, wherein: be fixed with second pulley seat (349) on fork frame (2), second pulley seat (349) are including fixing bottom plate (350) on fork frame (2), two fix on bottom plate (350) and with bottom plate (350) vertically curb plate (351) and connect in the front end plate (352) relative with bottom plate (350) of keeping away from the tip of bottom plate (350) of curb plate (351), the tip of keeping away from bottom plate (350) on curb plate (351) is equipped with U-shaped draw-in groove (353), the both ends of front end plate (352) are equipped with lug (354) of card income U-shaped draw-in groove (353) respectively.

9. The hand truck according to claim 8, wherein: a pulley shaft (355) is arranged between the bottom plate (350) and the front end plate (352), and the second pulley (303) is arranged on the pulley shaft (355); a pulley guide plate (356) with a semicircular groove-shaped upper end is fixed between the two side plates (351) and on the inner side surface of the side plate (351).

10. The hand truck according to claim 1, wherein: two universal wheels (357) are arranged at the bottom end part of the frame (1).