Chain type truck-mounted forklift

Abstract

The utility model discloses a chain type truck-mounted forklift. The chain type truck-mounted forklift comprises a bottom frame, a stand column frame is vertically arranged on the bottom frame, a sliding groove is formed in the bottom side of the bottom frame, and movable supporting legs are arranged in the sliding groove in a sliding mode. The lifting unit comprises a driving piece arranged in the stand column frame and a lifting frame arranged on the driving piece; the protection unit comprises a protection part arranged at the top of the lifting frame and a limiting switch arranged at the bottom of the stand column frame, the protection part comprises a disc spring connected with the driving part, an overweight sensor and two limiting blocks, the overweight sensor and the two limiting blocks are arranged at the upper end of the lifting frame, the overweight sensor is located at the lower end of the disc spring, and the limiting blocks are located on the two sides of the disc spring; the electric control unit is arranged on the bottom frame and is electrically connected with the lifting unit and the protection unit; the disc spring is connected with the driving piece, the driving piece drives the lifting frame to ascend and descend, the overweight sensor in the protection unit can monitor the deformation quantity of the disc spring in real time, and when an operator inaccurately estimates the cargo weight or overloads blindly, the disc spring can deform due to the too high load, so that an alarm is triggered.

Description

Technical Field

[0001] This utility model relates to the field of forklift technology, specifically to a chain-driven truck-mounted forklift. Background Technology

[0002] Forklifts are widely used in the logistics and transportation industry. They achieve the lifting and handling of goods through chain drive and have advantages such as flexible operation and easy portability.

[0003] For example, CN213976850U discloses a manual forklift, which includes a bottom support, with a first rail and a second rail vertically arranged on both sides of the bottom support, a lifting plate installed between the first rail and the second rail, a fork fixed on one side of the lifting plate, and a manual winch fixed on the side of the first rail and the second rail away from the fork; the top of the first rail and the second rail are fixed by a crossbeam; a fixed pulley is provided in the middle of the lower surface of the crossbeam; the wire rope in the manual winch passes around the fixed pulley and is connected to the top of the lifting plate; wheels are provided at the bottom of the bottom support. This device solves the inconvenience caused by limited space preventing the use of electric forklifts or electric lifting forklifts, solves the limitation of the work site, saves costs, and improves efficiency.

[0004] However, in actual use, due to inaccurate estimation of cargo weight by operators, or blind overloading in pursuit of efficiency, forklifts are often overloaded. When a forklift is overloaded, the vehicle's center of gravity shifts, which can easily cause a rollover accident. This not only damages the cargo but may also cause serious damage to the forklift itself, posing a significant safety hazard and threatening the lives of operators and those around them. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a chain-driven truck forklift to solve the problem that the forklift is often overloaded and causes safety hazards due to the operator's inaccurate estimation of the weight of the goods or blind overloading in pursuit of efficiency.

[0006] According to an embodiment of this utility model, a chain-driven forklift includes a chassis with a vertically mounted column frame. A sliding groove is provided on the bottom side of the chassis, and a movable support leg is slidably mounted in the groove. A lifting unit includes a drive component mounted inside the column frame and a lifting frame mounted on the drive component. A protective unit includes a protective component mounted on the top of the lifting frame and a limit switch mounted on the bottom of the column frame. The protective component includes a disc spring connected to the drive component and an overload sensor and two limit blocks mounted on the upper end of the lifting frame. The overload sensor is located at the lower end of the disc spring, and the limit blocks are located on both sides of the disc spring. An electronic control unit is mounted on the chassis and electrically connected to the lifting unit and the protective unit.

[0007] Compared to existing technologies, this invention offers the following advantages: By connecting the disc spring to the drive unit, the drive unit propels the lifting frame up and down. The overload sensor in the protection unit monitors the deformation of the disc spring in real time. When the operator misjudges the weight of the goods or blindly overloads, the load on the lifting frame exceeds the preload of the disc spring. The disc spring deforms due to the excessive load, triggering the overload sensor at the lower end of the disc spring. The overload sensor quickly detects the overload and transmits the signal to the electronic control unit. Upon receiving the overload signal, the electronic control unit can control the lifting unit to stop working according to a preset program, preventing the forklift from continuing to carry excessively heavy goods and preventing safety hazards caused by overload at the source. Simultaneously, with the two limit blocks, in conjunction with the disc spring, when the lifting frame rises to contact the two limit blocks and the drive unit continues to output power, the reaction force will also cause the disc spring to deform due to the excessive load, triggering the overload sensor and pausing the drive unit's output, preventing damage to the drive unit or the vehicle structure.

[0008] Preferably, the lifting frame is provided with a storage slot, and the movable support leg is located in the storage slot. The movable support leg is provided with a roller at the end near the lifting frame.

[0009] Preferably, the driving component includes a driving source mounted on the base frame and a mounting shaft located at the upper end of the column frame. Both ends of the driving source output end and the mounting shaft are provided with sprockets, and each pair of corresponding sprockets is fitted with a transmission chain.

[0010] Preferably, the lifting frame is provided with two connecting blocks and two sets of rolling bearings at one end near the column frame. Each set of rolling bearings consists of two blocks. Each connecting block is connected to the corresponding transmission chain, and each rolling bearing is respectively locked inside the column frame.

[0011] Preferably, a mounting base is provided at the upper end of the column frame, and the disc spring is adjustablely mounted on the mounting base by adjusting bolts, with the mounting shaft connected to the disc spring.

[0012] Preferably, the electronic control unit includes a power supply mounted on the base frame and a control system electrically connected to the power supply. The drive source and the overload sensor are both electrically connected to the control system.

[0013] Preferably, an alarm is installed on the column frame, and the alarm is electrically connected to the control system.

[0014] Preferably, a lighting system is installed on the column frame, and the lighting system is electrically connected to the control system.

[0015] Preferably, a support wheel is provided in the middle of the movable outrigger.

[0016] Preferably, side wheels are provided at both ends of the bottom of the base frame. Attached Figure Description

[0017] Figure 1This is a three-dimensional structural diagram of an embodiment of the present utility model.

[0018] Figure 2 This is an exploded structural diagram of an embodiment of the present invention.

[0019] Figure 3 This is a three-dimensional structural diagram of the lifting unit in an embodiment of this utility model.

[0020] Figure 4 for Figure 1 A magnified view of region A in the middle.

[0021] Figure 5 for Figure 3 A magnified view of region B in the middle.

[0022] The reference numerals in the accompanying drawings of the instruction manual include: 1. Base frame; 100. Housing; 101. Slide groove; 2. Lifting frame; 201. Storage slot; 202. Connecting block; 203. Rolling bearing; 3. Movable support leg; 301. Roller; 302. Support wheel; 303. Side wheel; 4. Column frame; 402. Mounting base; 5. Drive source; 501. Transmission chain; 502. Sprocket; 6. Power supply; 601. Alarm; 602. Lighting system; 7. Disc spring; 701. Mounting shaft; 702. Overload sensor; 703. Limit block; 704. Adjusting bolt. Detailed Implementation

[0023] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0024] like Figures 1 to 5 As shown, this utility model embodiment proposes a chain-driven forklift, which includes a base frame 1; a column frame 4 is vertically arranged on the base frame 1, and a sliding groove 101 is provided on the bottom side of the base frame 1, with movable support legs 3 slidably arranged in the sliding groove 101; a lifting unit, including a drive component arranged in the column frame 4, and a lifting frame 2 arranged on the drive component; a protection unit, including a protection component arranged on the top of the lifting frame 2 and a limit switch arranged at the bottom of the column frame 4, the protection component including a disc spring 7 connected to the drive component and an overload sensor 702 and two limit blocks 703 arranged on the upper end of the lifting frame 2, the overload sensor 702 being located at the lower end of the disc spring 7, and the limit blocks 703 being located on both sides of the disc spring 7; and an electrical control unit, arranged on the base frame 1, electrically connected to the lifting unit and the protection unit.

[0025] The detailed working process of this embodiment is as follows: The function of the limit switch is to limit the downward lifting frame 2. When the lifting frame 2 descends to the limit switch, the limit switch is triggered and the limit switch sends a signal, and the driving component stops working.

[0026] The disc spring 7 is connected to the drive unit, which drives the lifting frame 2 to rise and fall. The overload sensor 702 in the protection unit can monitor the deformation of the disc spring 7 in real time. When the operator misjudges the weight of the goods or blindly overloads, the load on the lifting frame 2 exceeds the preload of the disc spring 7. The disc spring 7 will deform due to the excessive load, thereby triggering the overload sensor 702 at the lower end of the disc spring 7. The overload sensor 702 can quickly detect the overload situation and transmit the signal to the electronic control unit. After receiving the overload signal, the electronic control unit can control the lifting unit to stop working according to the preset program to prevent the forklift from continuing to carry excessively heavy goods. At the same time, with the setting of the two limit blocks 703, in conjunction with the disc spring 7, when the lifting frame 2 rises to abut against the two limit blocks 703 and the drive unit continues to output, the reaction force will also cause the disc spring 7 to deform due to the excessive load, triggering the overload sensor 702, thereby pausing the output of the drive unit and preventing the drive unit from burning out or the vehicle structure from being damaged.

[0027] like Figure 1 As shown, the lifting frame 2 has a storage slot 201, and the movable support leg 3 is located in the storage slot 201. The movable support leg 3 is provided with a roller 301 at one end near the lifting frame 2.

[0028] The detailed working process of this embodiment is as follows: The lifting frame 2 is provided with a storage slot 201 for placing the movable support leg 3, so as to ensure that the movable support leg 3 will not be interfered with when it retracts.

[0029] like Figures 2 to 4 As shown, the driving component includes a driving source 5 mounted on the base frame 1 and a mounting shaft 701 located at the upper end of the column frame 4. Both ends of the driving source 5 and the mounting shaft 701 are provided with sprockets 502, and each pair of corresponding sprockets 502 is fitted with a transmission chain 501.

[0030] The detailed working process of this embodiment is as follows: sprockets 502 are set at both ends of the output end of the drive source 5 and the mounting shaft 701, and a transmission chain 501 is fitted on them, forming a typical chain drive system. The chain drive transmits power through the meshing of the chain and the teeth of the sprockets 502. It does not slip and can ensure a constant transmission ratio, thereby making the lifting motion of the lifting frame 2 more stable and precise.

[0031] In this embodiment, the drive source 5 includes a motor and a worm gear reducer, which work together. The output end of the worm gear reducer is connected to the sprocket 502. The worm gear reducer has a self-locking capability, preventing the lifting frame 2 from sliding down when stopped. Depending on the actual situation, it is electrically connected to the motor through an intermediate relay. The intermediate relay supplies different positive and negative voltages to the motor, causing it to rotate in both directions, thus raising and lowering the lifting frame 2. The intermediate relay is equipped with a heating wire that consumes energy. The heating wire can quickly dissipate the inertial energy of the motor and its load, allowing the lifting frame 2 to stop quickly and accurately at the required position. The power supply technology for the intermediate relay and the heating wire for energy consumption are both conventional technologies. This embodiment only briefly describes how the intermediate relay can dissipate the inertial energy of the motor and its load. This method is a conventional setup for those skilled in the art and will not be elaborated on here.

[0032] like Figure 5 As shown, the lifting frame 2 has two connecting blocks 202 and two sets of rolling bearings 203 mirrored on one end near the column frame 4. Each set of rolling bearings 203 consists of two blocks. Each connecting block 202 is connected to the corresponding transmission chain 501, and each rolling bearing 203 is respectively locked inside the column frame 4.

[0033] The detailed working process of this embodiment is as follows: The connecting block 202 on the lifting frame 2 is connected to the transmission chain 501. When the drive source 5 drives the sprocket 502 to rotate, causing the transmission chain 501 to move, it can directly transmit power to the lifting frame 2, driving it to perform lifting actions. The two mirror-arranged connecting blocks 202 can ensure that the lifting frame 2 is subjected to uniform force, avoiding tilting or jamming caused by uneven force. The use of the rolling bearing 203 can also reduce the wear between components and extend the service life of the lifting frame 2 and the column frame 4. At the same time, the structure of the rolling bearing 203 can withstand certain radial and axial loads, ensuring that the lifting frame 2 moves stably in the vertical direction and can resist certain lateral forces, enabling the forklift to work normally under complex working conditions.

[0034] like Figure 5 As shown, a mounting base 402 is provided at the upper end of the column frame 4, and the disc spring 7 is adjustablely mounted on the mounting base 402 by adjusting bolt 704. The mounting shaft 701 is connected to the disc spring 7.

[0035] The detailed working process of this embodiment is as follows: With the setting of the adjusting bolt 704, an adjustable range is formed. The relative position of the disc spring 7 and the mounting base 402 is adjusted by adjusting the adjusting bolt 704, thereby adjusting the tension of the transmission chain 501 and controlling the problem of the transmission chain 501 becoming loose due to long-term operation. During adjustment, when the disc spring 7 is away from the mounting base 402, the transmission chain 501 is pulled and becomes tighter, and vice versa.

[0036] like Figure 2As shown, the electronic control unit includes a power supply 6 mounted on the base frame 1 and a control system electrically connected to the power supply 6. The drive source 5 and the overload sensor 702 are both electrically connected to the control system.

[0037] The detailed working process of this embodiment is as follows: Power supply 6 provides stable power support for the electronic control unit, while the control system is responsible for coordinating and controlling various parts of the forklift. On one hand, the control system receives the weight signal of the goods from the overload sensor 702 and analyzes and judges it according to the preset overload threshold. When the overload is detected, the control system can react quickly and control the drive source 5 to stop working, preventing the forklift from continuing to carry excessively heavy goods and avoiding safety accidents caused by overload. On the other hand, the control system can also accurately control the output power and running direction of the drive source 5 according to the operator's instructions, so as to realize the smooth lifting of the lifting frame 2 and improve the efficiency and accuracy of goods handling.

[0038] The control system in this embodiment employs conventional programmable logic controller (PLC) or microcontroller unit (MCU) technology. Through preset control programs and algorithms, it achieves automated control of functions such as starting and stopping the forklift drive source 5, moving the lifting frame 2, and overload alarm. This control system is based on a mature industrial control technology architecture, which will not be described in detail here.

[0039] like Figure 3 As shown, an alarm 601 is installed on the column frame 4, and the alarm 601 is electrically connected to the control system.

[0040] The detailed working process of this embodiment is as follows: the alarm 601 is electrically connected to the control system. When the overweight sensor 702 detects that the weight of the goods exceeds the preset threshold and transmits the signal to the control system, the control system can quickly trigger the alarm 601 to sound an alarm.

[0041] In this embodiment, the alarm 601 is a buzzer, which immediately emits a clear audible and visual warning signal when an alarm is triggered, such as a piercing buzzing sound and flashing lights, to attract the operator's attention. This instant warning mechanism allows the operator to know immediately that the forklift is overloaded, thus enabling timely measures to be taken to avoid safety accidents caused by negligence or failure to detect overloading in time.

[0042] like Figure 3 As shown, a lighting system 602 is installed on the column frame 4, and the lighting system 602 is electrically connected to the control system.

[0043] The detailed working process of this embodiment is as follows: With the lighting system 602 set up, providing sufficient lighting in complex environments is crucial to ensure that the work area is always bright; at the same time, the lighting system 602 illuminates the area around the forklift, which can remind people around to pay attention to the operation of the forklift, avoid accidents that may cause personal injury or death, and greatly enhance the safety of personnel and equipment during nighttime operations.

[0044] like Figure 2 As shown, a support wheel 302 is provided in the middle of the movable support leg 3.

[0045] The detailed working process of this embodiment is as follows: With the support wheel 302 in place, sufficient support strength is provided for the movable outrigger 3 to ensure the rigidity of the movable outrigger 3 during the operation of the forklift.

[0046] like Figure 1 As shown, side wheels 303 are provided at both ends of the bottom of the base frame 1.

[0047] The detailed working process of this embodiment is as follows: With the side wheel 303 in place, the stability of the forklift is improved, and the forklift is prevented from tipping over during operation.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A chain type truck-mounted fork lift characterized by comprising: Include: The chassis (1) is vertically provided with a column frame (4), and the bottom side of the chassis (1) is provided with a sliding groove (101), and the sliding groove (101) is slidably provided with a movable support leg (3); The lifting unit comprises a driving member arranged in the column frame (4), and a lifting frame (2) arranged on the driving member; The protection unit comprises a protection member arranged on the top of the lifting frame (2) and a limit switch arranged on the bottom of the column frame (4), the protection member comprises a disc spring (7) connected with the driving member and an overloading sensor (702) and two limit blocks (703) arranged on the upper end of the lifting frame (2), the overloading sensor (702) is located at the lower end of the disc spring (7), and the limit block (703) is located on both sides of the disc spring (7); The electric control unit is arranged on the chassis (1) and is electrically connected with the lifting unit and the protection unit.

2. The chain type forklift truck according to claim 1, characterized by: The lifting frame (2) is provided with a receiving groove (201), and the movable support leg (3) is located in the receiving groove (201), wherein one end of the movable support leg (3) close to the lifting frame (2) is provided with a roller (301).

3. The chain type forklift truck according to claim 2, characterized in that: The driving member comprises a driving source (5) arranged on the chassis (1) and a mounting shaft (701) located at the upper end of the column frame (4), the output end of the driving source (5) and both ends of the mounting shaft (701) are provided with sprockets (502), and the corresponding sprockets (502) are both provided with transmission chains (501).

4. The chain type forklift truck according to claim 3, wherein The lifting frame (2) is provided with two connecting blocks (202) and two groups of rolling bearings (203) at one end close to the column frame (4), each group of rolling bearings (203) is two, each connecting block (202) is connected with the corresponding transmission chain (501), and each rolling bearing (203) is clamped in the column frame (4).

5. The chain type forklift truck according to claim 4, wherein: The upper end of the column frame (4) is provided with a mounting seat (402), the disc spring (7) is adjustably arranged on the mounting seat (402) through an adjusting bolt (704), and the mounting shaft (701) is connected with the disc spring (7).

6. The chain type forklift truck according to claim 3, wherein: The electric control unit comprises a power supply (6) arranged on the chassis (1) and a control system electrically connected with the power supply (6), and the driving source (5) and the overloading sensor (702) are electrically connected with the control system.

7. The chain type forklift truck according to claim 6, characterized in that: The column frame (4) is provided with an alarm (601), and the alarm (601) is electrically connected with the control system.

8. The chain type forklift truck according to claim 7, characterized in that: The column frame (4) is provided with a lighting system (602), and the lighting system (602) is electrically connected with the control system.

9. The chain type forklift truck according to claim 1, wherein: The movable support leg (3) is provided with a support wheel (302) in the middle.

10. The chain type forklift truck according to claim 7, wherein: The bottom of the chassis (1) is provided with side wheels (303) at both ends.

Images