CN115520813A

CN115520813A - Forklift counterweight structure

Info

Publication number: CN115520813A
Application number: CN202211190000.3A
Authority: CN
Inventors: 吴鹏; 陈航忠; 桂陆铭; 徐笑凡; 皇甫英杰; 程鹏飞
Original assignee: Zhejiang Un Forklift Co ltd
Current assignee: Zhejiang Un Forklift Co ltd
Priority date: 2022-09-28
Filing date: 2022-09-28
Publication date: 2022-12-27

Abstract

The invention discloses a forklift counterweight structure, which comprises a counterweight sliding chute arranged at the rear end of a forklift, wherein a counterweight mechanism is arranged in the counterweight sliding chute, and the counterweight mechanism comprises a counterweight block connected with the counterweight sliding chute in a sliding manner and a moving assembly used for pushing the counterweight block to slide back and forth; an adjusting cavity is formed in the counterweight block, an adjusting assembly is arranged in the adjusting cavity, and the adjusting assembly comprises an adjusting sliding block and a transmission assembly, wherein the adjusting sliding block is connected with the inner wall of the adjusting cavity in a sliding manner, and the transmission assembly drives the adjusting sliding block to slide; the bottom of the forklift is provided with a balance detection mechanism, and the balance detection mechanism comprises two measurement components and a comparison component, wherein the two measurement components are respectively used for detecting the height of the front side and the rear side of the forklift from the ground, and the comparison component is used for detecting the measurement value difference of the two measurement components; the measuring component is electrically connected with a PLC (programmable logic controller), the PLC is electrically connected with the moving component, and the PLC is electrically connected with the transmission component; the invention can well balance the gravity and prevent the forklift from leaning forward and leaning backward.

Description

Forklift counterweight structure

Technical Field

The invention relates to the technical field of forklifts, in particular to a forklift counterweight structure.

Background

Fork trucks are industrial handling vehicles, and refer to various wheeled handling vehicles that perform handling, stacking, and short-distance transport operations on piece pallet goods. Because fork truck carries the goods through the crotch of front side, when the goods is heavier, fork truck can take place to lean forward, in order to solve this problem, be equipped with the balancing weight at the fork truck rear end, thereby make fork truck when the stack goods, keep fork truck balanced, and the balancing weight and the fork truck fixed connection of fork truck rear end that present majority mill put into use, like a fork truck counter weight structure of application number CN201721814371.9, adopt the shaping to enclose the shell welding on counter weight frame assembly, thereby the position of unable adjustment balancing weight increases fork truck's load, very easily cause fork truck to lean forward when fork truck carries the goods that weight is big.

Disclosure of Invention

In order to solve at least one technical problem mentioned in the background art, the invention aims to provide a forklift counterweight structure which balances gravity and prevents a forklift from inclining forwards.

In order to achieve the purpose, the invention provides the following technical scheme:

the forklift counterweight structure comprises a counterweight chute arranged at the rear end of the forklift, a counterweight mechanism is arranged in the counterweight chute, and the counterweight mechanism comprises a counterweight block connected with the counterweight chute in a sliding manner and a moving assembly used for pushing the counterweight block to slide back and forth; an adjusting cavity is formed in the counterweight block, an adjusting assembly is arranged in the adjusting cavity, and the adjusting assembly comprises an adjusting sliding block and a transmission assembly, wherein the adjusting sliding block is connected with the inner wall of the adjusting cavity in a sliding manner, and the transmission assembly drives the adjusting sliding block to slide; the bottom of the forklift is provided with a balance detection mechanism, and the balance detection mechanism comprises two measurement components and a comparison component, wherein the two measurement components are respectively used for detecting the height of the front side and the rear side of the forklift from the ground, and the comparison component is used for detecting the measurement value difference of the two measurement components; the measuring component is electrically connected with a PLC, the PLC is electrically connected with the moving component, and the PLC is electrically connected with the transmission component.

Compared with the prior art, the invention has the beneficial effects that:

the height from the front and the back of the forklift to the ground is detected through the two measuring assemblies respectively, the two heights are compared through the measuring assembly, and if the front side is closer to the ground, the moving assembly/adjusting assembly is controlled through the PLC, so that the balancing weight/adjusting slide block moves to the back end of the forklift; if the rear side is closer to the ground, the PLC controls the moving assembly/adjusting assembly to move the balancing weight/adjusting slide block to the front end of the forklift, so that the gravity center of the forklift is adjusted, and the forklift is prevented from leaning forward and leaning backward; the weight balancing block is larger than the adjusting slide block, the weight is heavier than the adjusting slide block, and the balance change of the forklift is larger at the moment of lifting or putting down the goods, so that when the forklift lifts up or puts down the goods, the balance is adjusted by the weight balancing block; in the running process, the road surface is usually uneven or an uneven phenomenon is generated during acceleration/deceleration, and the unstable phenomenon can be balanced and adjusted by adjusting the sliding block.

Preferably, the transmission grooves are formed in two sides of the balancing weight, the moving assembly comprises two racks which are fixedly arranged on the inner walls of the two transmission grooves respectively, two gears which are meshed with the two racks respectively and are driven to rotate, and first motors which drive the two gears respectively, the first motors are fixedly arranged on the inner walls of the balancing weight sliding grooves, and the PLC is electrically connected with the first motors.

Preferably, the two racks are respectively a long rack and a short rack, wherein the gear meshed with the short rack drives the counterweight block to move towards the rear side of the forklift, and the gear meshed with the long rack drives the counterweight block to move towards the front side of the forklift; the length of the long rack is equal to that of the transmission groove, the length of the short rack is smaller than that of the transmission groove by the radius of one gear, and the short rack extends from the rear side to the front side of the forklift.

Preferably, two measuring component are located fork truck's front and back both ends respectively, and measuring component includes the cylinder that sets firmly in the bottom of fork truck, with the inner wall sliding connection's of cylinder piston, set firmly the push rod in the bottom of piston, set firmly the wheel carrier in the bottom of push rod and with the pulley of wheel carrier rotation connection, the cover is equipped with the pressure spring on the push rod, two other stress ends of pressure spring set firmly respectively on wheel carrier and cylinder, pulley and ground butt.

Preferably, the measuring component comprises an air cavity fixedly arranged on the forklift, a conductor slide block connected with the air cavity in a sliding manner, and first metal sheets fixedly arranged at two ends of the air cavity; and air pipes for communicating the air cylinders with the air cavities are arranged between the front side and the rear side of the air cylinder and between the two air cavities respectively, and the first metal sheet is connected with the PLC through a lead.

Preferably, the inner wall of the air cavity is provided with four second metal sheets, and the second metal sheets are connected with the PLC through wires; initially, the conductor slide block is located in the middle of the air cavity, and the four second metal sheets are symmetrically distributed on two sides of the conductor slide block in pairs.

Preferably, the transmission assembly comprises a screw rod in threaded connection with the adjusting slider and a second motor for driving the screw rod to rotate, the second motor is electrically connected with the PLC, a stop block for preventing the adjusting slider from sliding out is arranged at the end part of the adjusting cavity, and the stop block is sleeved at the end part of the screw rod.

Preferably, the bottom of balancing weight is equipped with slide rail set spare, slide rail set spare including set firmly in the slide rail of the diapire of balancing weight spout to and set firmly in the saddle of balancing weight bottom, the saddle with slide rail sliding connection.

Preferably, the top of balancing weight is opened there is the indent, the internal rotation of balancing weight spout is connected with the running roller, the running roller with the diapire butt in indent.

Preferably, the rear end of the balancing weight is provided with a limiting plate, the end face of the limiting plate is larger than the notch of the balancing weight sliding chute, and when the balancing weight is completely located in the balancing weight sliding chute, the limiting plate abuts against the rear end of the forklift.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a side cross-sectional view of the present invention;

FIG. 3 is an enlarged partial view of FIG. 2"A";

FIG. 4 is an enlarged partial view of FIG. 2"B";

FIG. 5 is an enlarged partial view of FIG. 2"C";

FIG. 6 is a cross-sectional view taken at 2"D-D";

FIG. 7 is a schematic structural view of a counterweight mechanism according to the present invention;

FIG. 8 is a rear view of FIG. 7;

in the figure:

1. a forklift; 11. a counterweight chute; 2. a counterweight mechanism; 20. a limiting plate; 21. a balancing weight; 210. adjusting the cavity; 211. pressing a groove; 212. a transmission groove; 22. an adjustment assembly; 221. a screw; 222. adjusting the sliding block; 223. a stopper; 224. a second motor; 23. a roller; 24. a slide rail assembly; 241. a slide rail; 242. a slider; 25. a moving assembly; 250. a motor fixing plate; 251. a first motor; 252. a gear; 253. a rack; 253a, long rack; 253b, short rack; 3. a balance detection mechanism; 30. an air tube; 31. a measurement assembly; 311. a cylinder; 312. a push rod; 313. a piston; 314. a wheel carrier; 315. a pressure spring; 316. a pulley; 32. a calibration component; 321. an air cavity; 322. a conductor slider; 323. a second metal sheet; 324. a first metal sheet.

Detailed Description

The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 to 4, the counterweight structure of the forklift is provided in the present embodiment, and includes a balance detection mechanism 3 located at the bottom of the forklift 1, where the balance detection mechanism 3 includes two measurement assemblies 31 respectively used for detecting heights of the front side and the rear side of the forklift 1 from the ground and a measurement assembly 32 used for detecting a measurement value difference between the two measurement assemblies 31, and the measurement assembly 32 is electrically connected to a PLC.

Referring to fig. 2 and fig. 3, in the embodiment, two measuring assemblies 31 are respectively located at the front end and the rear end of the forklift 1, and the closer the measuring assembly 31 at the front side is to the head of the forklift 1, and the closer the measuring assembly 31 at the rear side is to the tail of the forklift 1, the better the detection effect is; the measuring component 31 includes a cylinder 311 fixed at the bottom of the forklift 1, a piston 313 slidably connected with the inner wall of the cylinder 311, a push rod 312 fixed at the bottom of the piston 313, a wheel carrier 314 fixed at the bottom of the push rod 312, and a pulley 316 rotatably connected with the wheel carrier 314, wherein a compression spring 315 is sleeved on the push rod 312, the other two stressed ends of the compression spring 315 are respectively fixed on the wheel carrier 314 and the cylinder 311, and the pulley 316 is abutted to the ground by the compression spring 315.

Referring to fig. 2 and 4, in the embodiment, the measuring component 32 includes an air cavity 321 fixed on the forklift 1, a conductor slider 322 slidably connected to the air cavity 321, and first metal sheets 324 fixed on front and rear sides of the air cavity 321, where the front and rear sides of the air cavity 321 refer to front and rear sides relative to the forklift 1; an air pipe 30 for penetrating the air cylinder 311 and the air chambers 321 is arranged between each of the two ends of the air cylinder 311 and each of the two air chambers 321, the first metal sheet 324 is connected with the PLC through a wire, when the conductor slide block 322 is in contact with the first metal sheet 324, current passes through the wire, the first metal sheet 324 and the conductor slide block 322, and the PLC converts the current into an electric signal, so that the PLC receives the signal that the conductor slide block 322 touches the first metal sheet 324; the inner wall of the air cavity 321 is provided with four second metal sheets 323, and the second metal sheets 323 are connected with the PLC through wires; initially, the conductor slider 322 is located in the middle of the air cavity 321, the four second metal sheets 323 are symmetrically distributed on two sides of the conductor slider 322 in pairs, the two second metal sheets 323 on the same side are located on the inner wall (as shown in fig. 4) on the opposite side of the air cavity 321, when the conductor slider 322 contacts with the second metal sheets 323, current sequentially passes through the lead wire connected to the second metal sheet 323 on the upper side, the conductor slider 322, the second metal sheet 323 on the lower side, and the lead wire connected to the second metal sheet 323 on the lower side, the PLC converts the current into an electrical signal, and the PLC receives the signal that the conductor slider 322 contacts with the second metal sheet 323; it should be noted that the current flowing into the conductor slider 322 from the first metal sheet 234 is located at both sides of the conductor slider 322, the current flowing into the conductor slider 322 from the second metal sheet 323 is located at the middle of the conductor slider 322, and an insulator is arranged between the two, i.e. the current flowing into the conductor slider 322 from the first metal sheet 234 is not communicated with the current flowing into the conductor slider 322 from the second metal sheet 323, and thus no short circuit occurs.

Referring to fig. 1, 2, 7, and 8, in this embodiment, a counterweight chute 11 is formed at a rear end of a forklift 1, a counterweight mechanism 2 is disposed in the counterweight chute 11, the counterweight mechanism 2 includes a counterweight 21 slidably connected to an inner wall of the counterweight chute 11, and a moving assembly 25 for pushing the counterweight 21 to slide back and forth, transmission grooves 212 are formed at two sides of the counterweight 21, the moving assembly 25 includes two racks 253 respectively fixed to inner walls of the two transmission grooves 212, two gears 252 respectively engaged with the two racks 253 for transmission, and a first motor 251 for respectively driving the two gears 252 to rotate, the first motor 251 is fixed to the inner wall of the counterweight chute 11, and the PLC is electrically connected to the first motor 251.

It should be noted that, in order to prevent the counterweight 21 from moving too much backwards, which would cause the gear 252 to disengage from the rack 253, the two racks 253 are respectively a long rack 253a and a short rack 253b, wherein the gear 252 engaged with the short rack 253b drives the counterweight 21 to move towards the rear side of the forklift 1, and the gear 252 engaged with the long rack 253a drives the counterweight 21 to move towards the front side of the forklift 1; the length of the long rack 253a is equal to the length of the transmission groove 212, the length of the short rack 253b is smaller than the length of the transmission groove 212 by the radius of the gear 252, and the short rack 253b extends from the rear side to the front side of the forklift 1, wherein the gear 252 meshed with the short rack 253b drives the counterweight 21 to move towards the rear side of the forklift 1, the gear 252 meshed with the long rack 253a drives the counterweight 21 to move towards the front side of the forklift, so that the counterweight 21 can be effectively prevented from moving backwards too much, and the gear 252 is always meshed with the long rack 253 a.

In order to fix the first motor 251, a motor fixing plate 250 is disposed in the counterweight sliding chute 11, and the first motor 251 is fixedly disposed on the motor fixing plate 250.

Referring to fig. 1, fig. 2, fig. 5, and fig. 6, in the present embodiment, an adjustment cavity 210 is formed in the counterweight block 21, an adjustment assembly 22 is disposed in the adjustment cavity 210, the adjustment assembly 22 includes an adjustment slider 222 slidably connected to an inner wall of the adjustment cavity 210, a screw 221 threadedly connected to the adjustment slider 222, and a second motor 224 driving the screw 221 to rotate, a stopper 223 preventing the adjustment slider 222 from sliding out is disposed at an end of the adjustment cavity 210, the stopper 223 is sleeved at an end of the screw 221, and the adjustment assembly 22 can finely adjust the position of the center of gravity of the forklift 1 by changing a position of the adjustment slider 222.

Referring to fig. 6, in order to prevent the position of the counterweight 21 from deviating and causing the two gears 252 and the rack 253 not to be well engaged, in the embodiment, the bottom of the counterweight 21 is provided with the slide rail assembly 24, the slide rail assembly 24 includes a slide rail 241 fixedly disposed on the bottom wall of the counterweight sliding groove 11 and a slider 242 fixedly disposed on the bottom of the counterweight 21, the slider 242 is slidably connected to the slide rail 241, as can be seen from fig. 6, the sections of the slide rail 241 and the slider 242 are L-shaped and are engaged with each other, so that the counterweight 21 slides only along the slide rail 241.

Referring to fig. 5 to 7, in order to prevent the outer side of the counterweight 21 from being inclined due to gravity after sliding out of the counterweight chute 11, in this embodiment, a pressing groove 211 is formed at the top of the counterweight 21, a roller 23 is rotatably connected to the counterweight chute 11, and the roller 23 abuts against the bottom wall of the pressing groove 211, so as to effectively prevent the counterweight 21 from being inclined after sliding out of the counterweight chute 11.

Referring to fig. 1 and 5, in the embodiment, a limiting plate 20 is disposed at the rear end of the counterweight block 21, an end surface of the limiting plate 20 is larger than the notch of the counterweight sliding groove 11, and when the counterweight block 21 is completely located in the counterweight sliding groove 11, the limiting plate 20 abuts against the rear end of the forklift 1.

The operation principle of the balance detection mechanism 3 is that when the forklift 1 tilts forward, the push rod 312 on the front side pushes the piston 313 to move upward, and the gas in the cylinder 311 on the front side is pushed into the gas pipe 30 on the front side; the push rod 312 at the rear side drives the piston 313 to move downwards under the action of the pressure spring 315, negative pressure is generated in the air cylinder 311 at the rear side, and air at the rear side of the air cavity 321 is pumped into the air cylinder 311 at the rear side through the air pipe 30 at the rear side; when the conductor slider 322 is moved rearward, the conductor slider 322 contacts the second metal piece 323 on the rear side, and if the forklift 1 lifts the load, the forklift 1 tilts forward suddenly, and at this time, the conductor slider 322 contacts not only the second metal piece 323 on the rear side but also the first metal piece 324 on the rear side. When the forklift 1 leans backwards, the push rod 312 at the rear side pushes the piston 313 to move upwards, so that the gas in the cylinder 311 at the rear side is pushed into the gas pipe 30 at the rear side; the push rod 312 at the front side drives the piston 313 to move downwards under the action of the pressure spring 315, negative pressure is generated in the cylinder 311 at the front side, and the gas at the front side of the gas cavity 321 is pumped into the cylinder 311 at the front side through the gas pipe 30 at the rear side; when the forklift 1 releases the load, the forklift 1 may lean back suddenly, and at this time, the conductor slider 322 may contact not only the second metal plate 323 but also the first metal plate 324.

When the forklift 1 lifts a heavy object, the forklift 1 can tilt forward greatly instantly, the conductor slide block 322 moves towards the rear side instantly, the conductor slide block is abutted to the first metal sheet 324 at the rear side, current passes through a lead, the first metal sheet 324 at the rear side and the conductor slide block 322, the PLC converts the current into an electric signal for starting the first motor 251, the PLC controls the first motor 251 at one side of the short rack 253b to be started, the gear 252 is driven to be meshed with the short rack 253b, the counterweight block 21 moves backwards until the counterweight block 21 moves to a front-rear balanced position, and the conductor slide block 322 is located at the middle position of the air cavity 321; when the forklift 1 puts down the heavy object, the forklift 1 can have a large backward pitch in the twinkling of an eye, the conductor slide block 322 moves to the front side in the twinkling of an eye, the butt is on the first sheetmetal 324 of front side, the electric current passes through the wire, the first sheetmetal 324 and the conductor slide block 322 of front side, PLC converts the electric current into the signal of telecommunication that starts first motor 251 this moment, PLC control first motor 251 of long rack 253a one side starts, drive gear 252 and long rack 253a meshing, make the balancing weight 21 move forward, until the balancing weight 21 moves to the balanced position in front and back, conductor slide block 322 is located the intermediate position of air cavity 321 this moment.

In the carrying process, if the front and rear stress is unbalanced, the conductor sliding block 322 slides to the front and rear sides in a small range under the action of air pressure, and then contacts with the second metal sheet 323; if the front tilting happens, the conductor slide block 322 is contacted with the two second metal sheets 323 at the rear side, the current passes through the second metal sheets 323 at the rear side and the conductor slide block 322, the PLC converts the current into an electric signal for starting the second motor 224 to rotate forwards, and the PLC controls the second motor 224 to rotate forwards, so that the screw rod 221 drives the adjusting slide block 222 to move backwards; if the forklift is tilted backwards, the conductor slide block 322 is contacted with the second metal sheet 323 at the front side, current passes through the second metal sheet 323 at the front side and the conductor slide block 322, the PLC converts the current into an electric signal for starting the second motor 224 to rotate reversely, and the PLC controls the second motor 224 to rotate reversely, so that the screw 221 drives the adjusting slide block 222 to move forwards, and the center of gravity of the forklift 1 is finely adjusted.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims

1. The forklift counterweight structure is characterized by comprising a counterweight chute (11) arranged at the rear end of a forklift (1), wherein a counterweight mechanism (2) is arranged in the counterweight chute (11), and the counterweight mechanism (2) comprises a counterweight block (21) connected with the counterweight chute (11) in a sliding manner and a moving assembly (25) used for pushing the counterweight block (21) to slide back and forth; an adjusting cavity (210) is formed in the balancing weight (21), an adjusting assembly (22) is arranged in the adjusting cavity (210), and the adjusting assembly (22) comprises an adjusting slide block (222) connected with the inner wall of the adjusting cavity (210) in a sliding manner and a transmission assembly for driving the adjusting slide block (222) to slide; the bottom of the forklift (1) is provided with a balance detection mechanism (3), and the balance detection mechanism (3) comprises two measurement components (31) which are respectively used for detecting the height from the front side and the rear side of the forklift (1) to the ground and a measuring component (32) which is used for detecting the difference of the measurement values of the two measurement components (31); the measuring component (32) is electrically connected with a PLC, the PLC is electrically connected with the moving component (25), and the PLC is electrically connected with the transmission component.

2. The forklift counterweight structure according to claim 1, wherein transmission grooves (212) are formed on two sides of the counterweight block (21), the moving assembly (25) comprises two racks (253) respectively fixed on the inner walls of the two transmission grooves (212), two gears (252) respectively engaged with the two racks (253) for transmission, and first motors (251) respectively driving the two gears (252) to rotate, the first motors (251) are fixed on the inner walls of the counterweight sliding grooves (11), and the PLC is electrically connected with the first motors (251).

3. The forklift counterweight structure according to claim 2, wherein the two racks (253) are a long rack (253 a) and a short rack (253 b), respectively, wherein the gear (252) engaged with the short rack (253 b) drives the counterweight (21) to move toward the rear side of the forklift (1), and the gear (252) engaged with the long rack (253 a) drives the counterweight (21) to move toward the front side of the forklift (1); the length of the long rack (253 a) is equal to that of the transmission groove (212), the length of the short rack (253 b) is smaller than that of the transmission groove (212) by the radius of the gear (252), and the short rack (253 b) extends from the rear side to the front side of the forklift (1).

4. The forklift counterweight structure according to claim 1, wherein two measuring assemblies (31) are respectively located at the front end and the rear end of the forklift (1), each measuring assembly (31) comprises a cylinder (311) fixedly arranged at the bottom of the forklift (1), a piston (313) slidably connected with the inner wall of the cylinder (311), a push rod (312) fixedly arranged at the bottom of the piston (313), a wheel carrier (314) fixedly arranged at the bottom of the push rod (312), and a pulley (316) rotatably connected with the wheel carrier (314), a compression spring (315) is sleeved on the push rod (312), the other two stressed ends of the compression spring (315) are respectively fixedly arranged on the wheel carrier (314) and the cylinder (311), and the pulley (316) is abutted to the ground.

5. The forklift counterweight structure according to claim 4, wherein the weighing assembly (32) comprises an air chamber (321) fixed on the forklift (1), a conductor slide block (322) slidably connected with the air chamber (321), and first metal sheets (324) fixed at both ends of the air chamber (321); air pipes (30) used for penetrating through the air cylinder (311) and the air cavities (321) are arranged between the front side and the rear side of the air cylinder (311) and the two air cavities (321) respectively, and the first metal sheet (324) is connected with the PLC through a lead.

6. The forklift counterweight structure of claim 5, wherein the inner wall of the air cavity (321) is provided with four second metal sheets (323), and the second metal sheets (323) are connected with the PLC through wires; initially, the conductor slide block (322) is located in the middle of the air cavity (321), and four second metal sheets (323) are symmetrically distributed on two sides of the conductor slide block (322) in pairs.

7. The forklift counterweight structure according to claim 1, wherein the transmission assembly comprises a screw rod (221) in threaded connection with the adjusting slider (222) and a second motor (224) for driving the screw rod (221) to rotate, the second motor (224) is electrically connected with the PLC, a stopper (223) for preventing the adjusting slider (222) from sliding out is arranged at the end part of the adjusting cavity (210), and the stopper (223) is sleeved at the end part of the screw rod (221).

8. The forklift counterweight structure according to claim 1, wherein a slide rail assembly (24) is provided at the bottom of the counterweight block (21), the slide rail assembly (24) comprises a slide rail (241) fixedly arranged at the bottom wall of the counterweight chute (11), and a slider (242) fixedly arranged at the bottom of the counterweight block (21), and the slider (242) is slidably connected with the slide rail (241).

9. The forklift counterweight structure according to claim 1, wherein a pressure groove (211) is formed in the top of the counterweight block (21), a roller (23) is rotatably connected in the counterweight sliding groove (11), and the roller (23) abuts against the bottom wall of the pressure groove (211).

10. The forklift counterweight structure according to claim 1, wherein a limiting plate (20) is provided at the rear end of the counterweight block (21), the end surface of the limiting plate (20) is larger than the notch of the counterweight chute (11), and when the counterweight block (21) is completely located in the counterweight chute (11), the limiting plate (20) abuts against the rear end of the forklift (1).