A counterweight assembly for a transport forklift

Abstract

The present application relates to the technical field related to forklift accessories, and discloses a counterweight assembly for a transport forklift. In order to solve the problem of poor flexibility of the forklift due to fixed counterweight, one end of the traction rope is connected to the fork frame, and the other end is connected to the rope drum. The rope drum is driven forward / reverse according to the driving source, so that the rope drum reels / unreels the traction rope, thereby realizing the up and down movement of the fork frame. At the same time, when the fork frame transports heavier goods, the tensile strength of the traction rope increases, thereby forcing the counterweight frame to be pushed out from the rear end of the transport vehicle body, thereby increasing the counterweight length of the transport vehicle body and avoiding the transport vehicle body from tilting forward; similarly, when the transported goods are lighter, the tension on the traction rope is not enough to push the counterweight frame outward, so that the counterweight frame is always placed in the transport vehicle body, thereby reducing the overall length of the transport vehicle body, making the transport vehicle body more flexible and convenient when moving, and finally achieving the effect of autonomously adjusting the counterweight length by using the transport weight.

Description

Technical Field

[0001] The present application relates to the technical field related to forklift accessories, and in particular to a counterweight assembly for a transport forklift. Background Art

[0002] Forklifts, commonly referred to as forklifts, are key equipment in the modern logistics industry. Their core functions include the handling, stacking and short-distance transportation of goods. This type of equipment is widely used in logistics-intensive places such as factories, warehouses, and docks. Its efficient operating capacity greatly improves the overall efficiency of the logistics process.

[0003] In the design of forklifts, counterweight is a crucial component. The main function of counterweight is to ensure that the rear wheels of the forklift can maintain sufficient adhesion with the ground when the forks are lifting the goods, thereby ensuring the stability of the forklift during the handling process and the smoothness of driving and turning. Appropriate counterweight can not only improve the stability of the forklift, but also enhance its load capacity, making it adaptable to various different operating requirements.

[0004] However, in the actual handling process, especially when facing heavy objects, the front fork frame of the forklift is under great pressure, which may cause the forklift to tilt forward. To deal with this problem, the current common solution is to install a fixed-length counterweight frame at the rear end of the forklift. This design can alleviate the problem of forklift tilting forward to a certain extent, but it also brings challenges.

[0005] Although the fixed counterweight frame increases the stability of the forklift, it also increases the length of the vehicle body. When carrying light objects or needing to operate in a small space, the longer body may limit the forklift's operational flexibility.

[0006] Therefore, when designing the forklift counterweight, it is necessary to find a solution that can both ensure stability and improve flexibility. Summary of the invention

[0007] The present application proposes a counterweight assembly for a transport forklift, which has the advantage of autonomously adjusting the length of the counterweight according to the transport weight, and is used to solve the problem of poor flexibility of the forklift caused by fixed counterweights proposed in the above background technology.

[0008] To achieve the above-mentioned purpose, the present application adopts the following technical scheme: a counterweight assembly of a transport forklift, comprising: a transport body, a driving front wheel is installed at the front end as the main source of steering and driving, and a driven rear wheel is installed at the rear end for auxiliary support; a fork arm is installed at the front end of the transport body, and a fork frame that can move up and down is installed on the fork arm, which is used to insert the bottom of the goods to realize the transportation of the goods; a traction rope, one end of which is fastened to the top of the fork frame, passes through the reversing wheel fixed at the top of the fork arm and the bottom of the front end of the transport body, and is turned again at the rear end of the transport body, and is finally connected to the rope drum, which is movably installed on the transport body rear end; a limiting wheel, movably mounted on the inner side of the rear end of the transport vehicle body, and used for re-steering the traction rope after being turned by the reversing wheel; a counterweight frame, movably mounted on the rear end of the transport vehicle body, one end of which is movably mounted with a locking wheel located inside the transport vehicle body, and the traction rope is connected to the rope drum after the locking wheel is reversed; a reducer, fixedly connected to the rear end of the transport vehicle body, an output shaft end of which is coaxially fixed with the rope drum, and an input shaft end is fixedly connected to the driving source; a reset tension spring, one end of which is fixedly connected to the counterweight frame, and the other end is fixedly connected to the inner side of the transport vehicle body, and is used for retracting the counterweight frame into the interior of the transport vehicle body under normal conditions, thereby reducing the overall length of the transport vehicle body.

[0009] Furthermore, a counterweight plate is movably mounted on one end of the counterweight frame.

[0010] Furthermore, an air storage chamber is opened inside the counterweight frame, a gear row is movably installed inside the air storage chamber, and a spring is fixedly connected between the gear row and the inner side of the counterweight frame; a limit rod is movably installed at the rear end of the transport vehicle body, a grounding wheel is movably installed at the bottom of the limit rod, and a limit ring is fixed to the middle part of the outer side of the limit rod; a one-way limiting tooth is arranged at the bottom of the gear row.

[0011] Furthermore, a fan coaxially connected to the driven rear wheel is fixedly installed on the side of the transport vehicle body, the blades in the fan are fixedly connected to the rotating shaft of the driven rear wheel, and an air intake pipe is fixed on one side of the fan; the air duct is fixedly connected to the middle part of the transport vehicle body, and the air duct is connected to the air storage chamber through a connecting pipe, and the air duct is connected to the fan through an exhaust pipe; an intermediate piston is movably installed inside the air duct.

[0012] Furthermore, there are two fans, and the deflection angles of the blades in the two fans are arranged in opposite directions.

[0013] Furthermore, the outer top of the limiting wheel is higher than the outer bottom of the locking wheel.

[0014] Furthermore, a boosting inclined surface is arranged on one side of the bottom of the gear row, and a locking rod is movably installed on the inner side of the locking wheel, and one end of the locking rod is communicated with the air storage chamber.

[0015] The present invention has the following beneficial effects: The present application provides a counterweight assembly for a transport forklift, in which the counterweight frame is tightly connected to the fork frame through a traction rope. Specifically, one end of the traction rope is firmly connected to the fork frame, and the other end is connected to the rope drum. This design allows the forklift to rotate the rope drum forward or reverse according to the driving source during operation, thereby realizing the control of the retraction and release of the traction rope. As the traction rope is retracted and released, the fork frame can flexibly move up and down to meet the needs of handling goods at different heights.

[0016] When the forklift carries heavier cargo, the tension on the traction rope will increase significantly. This increased tension will cause the counterweight frame to automatically push out from the rear end of the transport vehicle, thereby increasing the counterweight length of the transport vehicle. This design effectively prevents the transport vehicle from tilting forward when carrying heavy objects, ensuring the stability and safety of the forklift during operation.

[0017] Similarly, when the cargo is relatively light, the tension on the traction rope will be reduced accordingly. At this time, the tension of the traction rope is not enough to push the counterweight frame outward, so the counterweight frame will remain inside the transport vehicle. This design shortens the overall length of the transport vehicle and improves the flexibility and convenience of the forklift in a small space.

[0018] Ultimately, this advanced counterweight component design enables the forklift to autonomously adjust the counterweight length according to the weight of the goods being transported, thereby maintaining optimal stability and flexibility in various operating environments. This innovative design not only improves the efficiency of the forklift, but also reduces operational risks, bringing significant convenience and benefits to the modern logistics industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which constitute a part of the specification, illustrate the embodiments disclosed in the present application and, together with the description, serve to explain the principles disclosed in the present application.

[0020] The present application can be more clearly understood from the following detailed description with reference to the accompanying drawings, in which: Figure 1 It is a schematic diagram of the overall external shape structure; Figure 2 This is a schematic diagram of the traction rope path; Figure 3 It is a schematic diagram of the internal planar cross-sectional structure of the transport vehicle body; Figure 4 This is a schematic diagram of the external shape of the counterweight frame; Figure 5 It is a schematic diagram of the internal three-dimensional cross-sectional structure of the counterweight frame; Figure 6 This is a schematic diagram of the fan distribution and its assembly; Figure 7 Schematic diagram of the three-dimensional structure of the gear row; Figure 8 Schematic diagram of the internal structure of the airway.

[0021] In the figure: 1. transport vehicle body; 100. driving front wheel; 101. driven rear wheel; 2. fork arm; 3. fork frame; 4. reversing wheel; 5. traction rope; 6. counterweight frame; 600. air storage chamber; 7. limit rod; 700. limit ring; 8. ground wheel; 9. counterweight plate; 10. air guide tube; 11. limit wheel; 12. locking wheel; 121. locking rod; 13. rope drum; 14. reducer; 15. driving source; 16. connecting pipe; 17. reset tension spring; 18. tooth row; 180. one-way limiting tooth; 181. boost ramp; 19. spring; 20. fan; 200. blade; 201. intake pipe; 202. exhaust pipe; 21. intermediate piston. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application. Embodiment 1

[0023] See also Figure 1 It can be seen that the transport vehicle body 1 is the main body of the entire device, and two driving front wheels 100 are installed at the front end of the transport vehicle body 1, and two driven rear wheels 101 are installed at the rear end. Among them, the driving front wheels 100 are the main source of steering and driving, and the driven rear wheels 101 are used for auxiliary support to ensure the stability of the transport vehicle body 1 during movement. A fork arm 2 is installed at the front end of the transport vehicle body 1, and a fork frame 3 that can move up and down is installed on the fork arm 2. When it is necessary to transport goods, the fork frame 3 is inserted into the bottom of the goods. After the fork frame 3 is lifted, the goods can be transported.

[0024] refer to Figure 2It can be seen that, unlike the commonly used driving methods on the market, the present application realizes the lifting and lowering of the fork frame 3 by means of a traction rope 5. Specifically, one end of the traction rope 5 is fastened to the top of the fork frame 3. After the traction rope 5 passes through the reversing wheel 4 fixed to the top of the fork arm 2 and the bottom of the front end of the transport vehicle body 1, the traction rope 5 is located at the rear end of the transport vehicle body 1. In addition, a limited wheel 11 is movably installed on the inner side of the rear end of the transport vehicle body 1, and a counterweight frame 6 is movably installed at the rear end of the transport vehicle body 1. One end of the counterweight frame 6 is movably installed with a locking wheel 12 located inside the transport vehicle body 1. After being turned by the reversing wheel 4, the traction rope 5 is turned again at the rear end of the transport vehicle body 1 by the limited wheel 11, and the traction rope 5 moves to the locking wheel 12 inside the transport vehicle body 1. After the traction rope 5 is reversed again by the locking wheel 12, the end of the traction rope 5 is fixedly connected to the rope drum 13 movably installed at the rear end of the transport vehicle body 1.

[0025] For the drive of the rope drum 13, Figure 2 As shown, the rear end of the transport vehicle body 1 has a reducer 14 fixedly connected by bolts, and the output shaft end of the reducer 14 is coaxially fixed with the rope drum 13, and the input shaft end of the reducer 14 is fixedly connected to the driving source 15, which is generally a driving motor.

[0026] Combination Figure 1 and Figure 2 It can be clearly seen that the counterweight frame 6 can extend outward from the rear end of the transport vehicle body 1 and combine with Figure 3 and Figure 4 It can be seen that one end of the counterweight frame 6 is fixedly connected to a reset spring 17, and one end of the reset spring 17 is fixedly connected to the inner side of the transport vehicle body 1. Under the influence of the elastic force of the reset spring 17, the counterweight frame 6 is always retracted into the interior of the transport vehicle body 1 under normal conditions, thereby reducing the overall length of the transport vehicle body 1 under normal conditions and making it easier for the transport vehicle body 1 to operate in a narrow space.

[0027] During specific application, the driving source 15 drives the rope drum 13 to rotate via the reducer 14 , and the forward / reverse rotation of the rope drum 13 realizes the winding / unwinding of the traction rope 5 .

[0028] Specifically, when the rope drum 13 rotates forward, the rope drum 13 releases the traction rope 5. Figure 2 It can be clearly seen that the fork frame 3 will move downward along the fork arm 2 under its own weight, and tighten the traction rope 5. As the traction rope 5 is continuously released, the fork frame 3 will fall to the bottom of the cargo.

[0029] The transport vehicle body 1 is controlled to insert the fork frame 3 to the bottom of the cargo. After that, the driving source 15 is controlled to make the rope drum 13 rotate in the opposite direction. The rope drum 13 winds up the traction rope 5 to realize the upward movement of the fork frame 3 along the fork arm 2. When the fork frame 3 lifts the cargo: If the cargo is light, the tension on the traction rope 5 is relatively low. Therefore, the force is not enough to push the counterweight frame 6 out from the rear end of the transport vehicle body 1 by pulling the locking wheel 12. When the transport vehicle body 1 is transporting lighter cargo, the counterweight frame 6 is always inside the transport vehicle body 1, thereby reducing the length of the transport vehicle body 1 and making it easier for the transport vehicle body 1 to operate in a narrow space.

[0030] Similarly, if the cargo is heavy, the pulling force on the traction rope 5 increases relatively. When the traction rope 5 is wound by the rope drum 13, the force of the traction rope 5 is sufficient to move the counterweight frame 6 out of the rear end of the transport vehicle 1 by pulling the locking wheel 12. When the counterweight frame 6 extends out of the rear end of the transport vehicle 1, the reset spring 17 will be stretched, thereby accumulating force for the subsequent reset of the counterweight frame 6. Due to the extension of the counterweight frame 6, the length of the transport vehicle 1 will increase, thereby increasing the stability of the movement of the transport vehicle 1. The principle is that when the transport vehicle 1 is working, the counterweight frame 6 and the cargo on the fork frame 3 will form a pair of levers. When the cargo is lifted, the driving front wheel 100 is used as the fulcrum. When the cargo is heavy, the transport vehicle 1 will tend to tilt forward. When the counterweight frame 6 moves out of the rear end of the transport vehicle 1, it will increase the torque of the transport vehicle 1 on the ground. This torque counteracts the torque generated by the cargo, thereby maintaining the balance of the forklift.

[0031] In the actual application process, in order to increase the weight of the counterweight frame 6, refer to Figure 1 It can be seen that a counterweight plate 9 is detachably mounted on one end of the counterweight frame 6, and the number of counterweight plates 9 installed can be adjusted as needed, so that the weight of the counterweight frame 6 can be adjusted eventually. Embodiment 2

[0032] Further improvements based on the first embodiment can be made from the content of the first embodiment. When the weight of the cargo is sufficient to move the counterweight frame 6 out of the rear end of the transport vehicle body 1, since the counterweight frame 6 does not have a limiting component, the counterweight frame 6 is directly moved out to the rear end of the transport vehicle body 1 due to the tension of the traction rope 5. Although extending the counterweight to the rear end will increase the weight of the rear part, this does not necessarily improve the stability of the forklift. The stability of the forklift is affected by many factors, including the location of the cargo, the driving speed of the forklift, the steering angle, etc. In some cases, excessively increasing the rear end counterweight may make the forklift more unstable when turning or performing certain operations.

[0033] In order to increase the stability of the transport vehicle 1, refer to Figure 3-Figure 5 It can be seen that the counterweight frame 6 is in a "U" shape, and an air storage chamber 600 opening downward is provided inside the counterweight frame 6. A gear row 18 is movably installed inside the air storage chamber 600, and a spring 19 is fixedly connected between the gear row 18 and the inner side of the counterweight frame 6. The gear row 18 is always in the air storage chamber 600 by the traction of the spring 19.

[0034] The rear end of the transport vehicle body 1 is movably provided with a limit rod 7 located on one side of the driven rear wheel 101. The cross-sectional shape of the limit rod 7 is elliptical, so that the limit rod 7 can only reciprocate up and down along the rear end of the transport vehicle body 1. The bottom of the limit rod 7 is movably provided with a grounding wheel 8. Under the action of gravity, the outer bottom of the grounding wheel 8 is on the same horizontal plane as the driven rear wheel 101. A limit ring 700 is fixed to the middle of the outer side of the limit rod 7, and the limit ring 700 limits the downward height of the limit rod 7 to prevent the limit rod 7 from falling from the rear end of the transport vehicle body 1.

[0035] More specifically, combined Figure 3 and Figure 7 It can be seen that a one-way limiting tooth 180 is arranged at the bottom of the tooth row 18, and the cross-sectional shape of the one-way limiting tooth 180 is approximately a right triangle. Figure 3 It can be seen that the top of the limit rod 7 is against the one-way limiting tooth 180. Due to the limitation of the cross-sectional shape of the one-way limiting tooth 180, when the tooth row 18 moves out from the rear end of the transport vehicle 1, the right-angled surface of the one-way limiting tooth 180 is blocked by the limit rod 7, so that the tooth row 18 cannot move outward; similarly, when the tooth row 18 is retracted into the inside of the transport vehicle 1, the inclined surface of the one-way limiting tooth 180 will pass through the top of the limit rod 7, and the movement of the tooth row 18 will not be limited. In order to reduce the separation strength between the top of the limit rod 7 and the one-way limiting tooth 180, a ball bearing can be installed around the top of the limit rod 7 in field application to ensure that when the limit rod 7 is pulled out from the right-angled surface of the one-way limiting tooth 180, the resistance to its separation is reduced.

[0036] During actual application, when the spring 19 is in the initial state, the tooth row 18 always remains in the air storage chamber 600 , and the tooth row 18 will not be pushed out of the air storage chamber 600 due to the existence of the spring 19 .

[0037] When the transport vehicle 1 is transporting goods through the fork frame 3, it should be noted that the driven rear wheel 101, the driving front wheel 100 and the grounding wheel 8 should be on the same level ground during the transport vehicle 1, so as to ensure that the top of the limit rod 7 is against the one-way limiting tooth 180. The fork frame 3 is lifted upward by the reverse rotation of the rope drum 13. If the goods are light, it is consistent with the transport method described in the first embodiment, and no further details are given here.

[0038] When the cargo to be transported is heavy, the pulling force on the traction rope 5 will be greater. Since the one-way limiting tooth 180 is blocked by the limit rod 7, when the traction rope 5 pulls the locking wheel 12, the locking wheel 12 cannot push the counterweight frame 6 out of the rear end of the transport vehicle body 1. As the rope drum 13 continuously rotates in the opposite direction, the pulling force of the traction rope 5 on the fork frame 3 will also increase continuously. Since the cargo is heavy, as the pulling force of the traction rope 5 increases, the transport vehicle body 1 will tend to tilt forward with the driving front wheel 100 as the fulcrum. At the same time, the grounding wheel 8 farthest from the driving front wheel 100 will have a significant upward deflection trend. When the grounding wheel 8 leaves the ground, the grounding wheel 8 is affected by gravity and will pull the limit rod 7 out of the one-way limiting tooth 180. When the limit rod 7 releases the constraint on the one-way limiting tooth 180, the movement restriction on the counterweight frame 6 is also released. When the traction rope 5 pulls the locking wheel 12 again, the counterweight frame 6 will be pushed out of the rear end of the transport vehicle body 1, thereby maintaining the balance of the whole vehicle.

[0039] As the rope drum 13 continuously winds up the traction rope 5, the traction rope 5 will cause the counterweight frame 6 to continuously pull backward until the counterweight strength provided by the counterweight frame 6 to the transport vehicle body 1 can balance the goods on the fork frame 3. Finally, the continuous extension of the counterweight frame 6 will cause the transport vehicle body 1 to deflect with the driving front wheel 100 as the fulcrum, so that the driven rear wheel 101 will contact the ground again. At the same time, the grounding wheel 8 will also contact the ground again, and the limit rod 7 will be pressed against the one-way limiting tooth 180 to limit the movement of the tooth row 18, thereby limiting the outward movement of the counterweight frame 6. At this time, the counterweight strength of the counterweight frame 6 can balance the goods on the fork frame 3.

[0040] As the rope drum 13 is rewound again, the traction rope 5 moves upward by pulling the fork frame 3, and the goods are lifted off the ground by the fork frame 3, thereby transporting the goods.

[0041] Finally, when the fork frame 3 unloads the goods, as the rope drum 13 rotates forward, the fork frame 3 places the goods at the desired position. Due to the elastic tension of the reset tension spring 17, as the rope drum 13 continuously releases the traction rope 5, the reset tension spring 17 will also pull the counterweight frame 6 back to the inside of the transport vehicle body 1. When the one-way limiting tooth 180 is retracted into the inside of the transport vehicle body 1, the inclined surface on the one-way limiting tooth 180 will contact the top of the limit rod 7, and the obstruction of the inclined surface by the limit rod 7 will compress the spring 19 upward. When the limit rod 7 passes over the highest end of the inclined surface of the one-way limiting tooth 180, the elastic force of the compressed spring 19 will again make the one-way limiting tooth 180 press against the top of the limit rod 7, ensuring that the tooth row 18 and the limit rod 7 are always in contact. When the counterweight frame 6 is completely retracted and the rope drum 13 releases the traction rope 5 again, the fork frame 3 will be separated from the cargo. The fork frame 3 can be separated from the cargo by moving the transport vehicle body 1 away from the cargo. Embodiment 3

[0042] In order to adapt the transport vehicle body 1 to carry heavy objects, the ground contacting wheels 8 can move on uneven ground. Figure 1-Figure 3 as well as Figure 6 It is obvious that a fan 20 coaxially connected to the driven rear wheel 101 is fixedly installed on the side of the transport vehicle body 1. Since there are two driven rear wheels 101, there are also two fans 20. The blades 200 in the fan 20 are fixedly connected to the rotating shaft of the driven rear wheel 101. When the driven rear wheel 101 moves, the blades 200 are driven to rotate, so that the fan 20 inhales air from the air inlet pipe 201, and the air is transported to the air guide pipe 10 through the exhaust pipe 202. Since the transport vehicle body 1 can move forward and backward, in order to ensure that there is always airflow transported to the air guide pipe 10 during the movement of the transport vehicle body 1, during the installation of the two fans 20, the deflection angles of the blades 200 in the two fans 20 are arranged in opposite directions, so that when the driven rear wheel 101 moves forward or backward, at least one fan 20 transports air to the air guide pipe 10.

[0043] The air duct 10 is fixedly connected to the middle of the transport vehicle body 1, and the air duct 10 is connected to the air storage chamber 600 through the connecting pipe 16. The connecting pipe 16 is a telescopic pipe, one end of which is fixed to the air duct 10, and the other end is fixed to the counterweight frame 6. When the transport vehicle body 1 moves, the blade 200 rotates to allow the air flow to be transported from the air intake pipe 201 to the exhaust pipe 202, and the air flow is poured into the air storage chamber 600 through the air duct 10 and the connecting pipe 16. Figure 8 As can be seen in the figure, an intermediate piston 21 is movably installed inside the air guide tube 10, and the intermediate piston 21 can move left and right in the air guide tube 10 to connect the exhaust pipe 202 inflated in the air guide tube 10 with the connecting pipe 16.

[0044] During specific application, the transport vehicle body 1 moves the fork frame 3 to the bottom of the cargo. When transporting the cargo, since the transport vehicle body 1 needs to stop moving, the air storage chamber 600 can communicate with the external atmosphere through the connecting pipe 16, the air guide pipe 10, the exhaust pipe 202 and the intake pipe 201. Therefore, when the transport vehicle body 1 stops moving, the air flow pressure in the air storage chamber 600 is equal to the external atmosphere.

[0045] Afterwards, the rope drum 13 rotates in the opposite direction to enable the fork frame 3 to lift the goods, and the lifting process is consistent with that described in the above-mentioned embodiment 2.

[0046] When the fork frame 3 lifts the goods, the goods are transported to the desired position through the transport vehicle body 1. When the transport vehicle body 1 moves forward or backward, the driven rear wheel 101 will rotate. The rotating shaft of the driven rear wheel 101 drives the blades 200 to rotate synchronously, so that the external airflow is input into the exhaust pipe 202 through the intake pipe 201. Since there is only one exhaust pipe 202 to input airflow into the air guide pipe 10, Figure 8 As shown, when the exhaust pipe 202 on the left inputs air flow into the air guide pipe 10, it pushes the middle piston 21 to move to the right, so that the exhaust pipe 202 on the left is connected to the connecting pipe 16, and the air intake of the exhaust pipe 202 on the right is the same as that on the left.

[0047] The movement of the transport vehicle 1 causes the external airflow to be continuously pressed into the air storage chamber 600, thereby increasing the pressure in the air storage chamber 600. Figure 3 It can be seen that when the pressure in the air storage chamber 600 increases, the tooth row 18 always has a tendency to press the limit rod 7 downward. When the ground-engaging wheel 8 passes through a low-lying area, the pressure in the air storage chamber 600 pushes the tooth row 18 downward, so that the top of the limit rod 7 always presses against the one-way limiting tooth 180; when encountering a bulge on the ground, the ground-engaging wheel 8 presses the tooth row 18 upward, so that the spring 19 is compressed and contracted. It can be seen that in the process of transporting goods by the transport vehicle 1, the limit rod 7 will always press against the one-way limiting tooth 180, which limits the extension length of the counterweight frame 6 to be relatively constant. In addition, the limit rod 7 has a certain upward and downward floating space, so that the ground-engaging wheel 8 can carry goods on a relatively uneven road surface. Embodiment 4

[0048] Further improvement on the basis of the third embodiment, as a safety setting for the transport vehicle 1 to transport goods, when the goods on the fork frame 3 are too heavy, even if the counterweight frame 6 is fully extended, it is not enough to balance the transport vehicle 1, which means that the transport vehicle 1 should not transport the goods, and the transport vehicle 1 should be stopped in time to avoid the transport vehicle 1 from tilting forward too much and flipping due to the traction rope 5 pulling the fork frame 3. Figure 2It can be seen that the outer top of the limiting wheel 11 is relatively close to the horizontal reference plane of the center line of the locking wheel 12, that is, the outer top of the limiting wheel 11 is higher than the outer bottom of the locking wheel 12. When the traction rope 5 extends the counterweight frame 6 excessively through the locking wheel 12, the locking wheel 12 will gradually approach the limiting wheel 11. Since the outer side of the limiting wheel 11 can block the locking wheel 12, the locking wheel 12 that continues to move outward will cooperate with the limiting wheel 11 and clamp the traction rope 5, thereby limiting the movement of the traction rope 5. When the rope drum 13 rewinds the traction rope 5 by rotating in the opposite direction, the traction rope 5 is locked, which makes it impossible for the traction rope 5 to move. Finally, the traction rope 5 will not pull the fork frame 3 excessively upward, and the transport vehicle body 1 will not flip over due to excessive forward tilting.

[0049] As a supplement to the fourth embodiment, in order to further limit the security, refer to Figure 3 and Figure 7 It can be seen that a boost slope 181 is arranged on one side of the bottom of the tooth row 18, and the boost slope 181 is relatively higher than the one-way limiting tooth 180. When the counterweight frame 6 extends excessively outward, the top of the limiting rod 7 will press against the boost slope 181, causing the tooth row 18 to move further upward. When the tooth row 18 passes over the connecting pipe 16, it can squeeze the airflow in the air storage chamber 600.

[0050] refer to Figure 5 It can be seen that a locking rod 121 is movably mounted on the inner side of the locking wheel 12, and one end of the locking rod 121 can extend from the outer side of the locking wheel 12, and the other end of the locking rod 121 is connected to the air storage chamber 600. When the pressure in the air storage chamber 600 increases, the locking rod 121 can be pushed to move outward. In detail, the end of the locking rod 121 is preferably set to be arc-shaped. Even if the locking rod 121 pushes the traction rope 5 outward, the arc groove at the end of the locking rod 121 will be stuck on the traction rope 5, thereby preventing the traction rope 5 and the locking rod 121 from being separated.

[0051] When the load on the fork frame 3 is too heavy, the rope drum 13 reels in the traction rope 5, and the locking wheel 12 moves toward the limiting wheel 11. Before the load is approached, the pressurized inclined surface 181 is first pushed by the limiting rod 7 and restricted by the limiting ring 700. Even if the transport vehicle body 1 tilts forward in a small range, the limiting rod 7 can still push against the pressurized inclined surface 181. When the tooth row 18 passes over the connecting pipe 16 and squeezes the air flow in the air storage chamber 600, the increased air flow pressure in the air storage chamber 600 will force the locking rod 121 to push outward. When the limiting wheel 11 and the locking wheel 12 are close to and attached to each other, the locking rod 121 will be further squeezed, so that the locking rod 121 is further pressed against the traction rope 5 according to the increased air flow pressure, thereby further restricting the movement of the traction rope 5, and finally increasing the locking strength of the restriction on the movement of the traction rope 5, to ensure that the traction rope 5 will not excessively pull the fork frame 3.

[0052] When the rope drum 13 rotates forward and releases the traction rope 5, the gear row 18 is pushed downward by the elastic force of the spring 19; the elastic force of the reset spring 17 contracts to reset the counterweight frame 6. After that, the counterweight strength can be enhanced by increasing the number of counterweight plates 9 installed, so that the goods can be transported again.

Claims

1. A counterweight assembly for a transport forklift, characterized in that: include: The transport vehicle body (1) has a driving front wheel (100) installed at the front end as the main source of steering and driving, and a driven rear wheel (101) installed at the rear end for auxiliary support; A fork arm (2) is mounted on the front end of the transport vehicle body (1), and a fork frame (3) capable of moving up and down is mounted on the fork arm (2) and is used to be inserted into the bottom of the cargo to transport the cargo; A traction rope (5) is fastened at one end to the top of the fork frame (3), passes through a reversing wheel (4) fixed to the top of the fork arm (2) and the bottom of the front end of the transport vehicle body (1), is turned again at the rear end of the transport vehicle body (1), and is finally connected to a rope drum (13) which is movably mounted at the rear end of the transport vehicle body (1); A limiting wheel (11) is movably mounted on the inner side of the rear end of the transport vehicle body (1) and is used to redirect the traction rope (5) after it has been redirected by the reversing wheel (4); A counterweight frame (6) is movably mounted on the rear end of the transport vehicle body (1), and a locking wheel (12) located inside the transport vehicle body (1) is movably mounted on one end of the counterweight frame. The traction rope (5) is connected to the rope drum (13) after being reversed by the locking wheel (12); A reducer (14) is fixedly connected to the rear end of the transport vehicle body (1), the output shaft end of which is coaxially fixed to the rope drum (13), and the input shaft end of which is fixedly connected to the driving source (15); A return tension spring (17) has one end fixedly connected to the counterweight frame (6) and the other end fixedly connected to the inner side of the transport vehicle body (1), and is used to retract the counterweight frame (6) into the interior of the transport vehicle body (1) under normal conditions, thereby reducing the overall length of the transport vehicle body (1).

2. The counterweight assembly of a transport forklift according to claim 1, characterized in that: A counterweight plate (9) is movably mounted on one end of the counterweight frame (6).

3. The counterweight assembly of a transport forklift according to claim 1, characterized in that: An air storage chamber (600) is provided inside the counterweight frame (6), a gear row (18) is movably installed inside the air storage chamber (600), and a spring (19) is fixedly connected between the gear row (18) and the inner side of the counterweight frame (6); A limit rod (7) is movably mounted on the rear end of the transport vehicle body (1); a grounding wheel (8) is movably mounted on the bottom of the limit rod (7); and a limit ring (700) is fixed to the middle portion of the outer side of the limit rod (7); A one-way limiting tooth (180) is arranged at the bottom of the tooth row (18).

4. The counterweight assembly of a transport forklift according to claim 3, characterized in that: A fan (20) coaxially connected to the driven rear wheel (101) is fixedly mounted on the side of the transport vehicle body (1); blades (200) in the fan (20) are fixedly connected to the rotating shaft of the driven rear wheel (101); and an air intake pipe (201) is fixed to one side of the fan (20); The air guide pipe (10) is fixedly connected to the middle part of the transport vehicle body (1), and the air guide pipe (10) is connected to the air storage chamber (600) through the connecting pipe (16), and the air guide pipe (10) is connected to the fan (20) through the exhaust pipe (202); An intermediate piston (21) is movably installed inside the air guide tube (10).

5. The counterweight assembly of a transport forklift according to claim 4, characterized in that: There are two fans (20), and the blades (200) in the two fans (20) are arranged with deflection angles in opposite directions.

6. The counterweight assembly of a transport forklift according to claim 4, characterized in that: The outer top of the limiting wheel (11) is higher than the outer bottom of the locking wheel (12).

7. The counterweight assembly of a transport forklift according to claim 6, characterized in that: A boosting inclined surface (181) is arranged on one side of the bottom of the gear row (18), and a locking rod (121) is movably mounted on the inner side of the locking wheel (12), and one end of the locking rod (121) is in communication with the air storage chamber (600).

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