Fork string shaft deformation safety control system

Abstract

The application discloses a fork string shaft deformation safety control system, relates to the technical field of forklifts, and comprises a fork frame assembly, further comprises: a left string shaft and a right string shaft, which are fixedly installed on the fork frame assembly and coaxially arranged; a left fork and a right fork which are respectively slidably hung on the left string shaft or the right string shaft; U-shaped notches are formed in the positions, where the left string shaft and the right string shaft are connected with the fork frame assembly, and fixed resistance strain gauges are fixedly connected in the U-shaped notches through composite bonding materials. The fixed resistance strain gauges can directly measure the deformation parameters of the load-bearing structure string shaft, have high precision and fast response, effectively guarantee the operation safety of the forklift under the limit working condition, provide an effective overload detection and real-time sound and light alarm system, and enable the driver to perceive the overload state in advance, so that the error caused by the complete dependence on subjective experience and judgment is avoided.

Description

Technical Field

[0001] This utility model relates to the field of forklift technology, specifically a safety control system for fork shaft deformation. Background Technology

[0002] The movement of forklift forks is achieved by mounting them on a spool with a circular cross-section, which has the following disadvantages: Structural fragility: The forks are mounted on the axial strut for lateral movement. The long axial strut itself is a weak point, bearing the main shear force. Under overload, especially when the force is applied at a certain point in the middle, it is very easy for plastic deformation, bending, or even breakage to occur, causing the forks to fail and fall off directly.

[0003] Increased risk of tipping over: Axle failure can instantly disrupt load stability, greatly increasing the likelihood of the forklift tipping over, especially during lifting, turning, or ramp operations.

[0004] Existing designs generally lack effective overload monitoring, preventing drivers from anticipating overload conditions and forcing them to rely entirely on experience and subjective judgment. This results in problems only becoming apparent after overload causes structural damage (axle bending / breakage), often leading to costly fork / mast damage, cargo destruction, or even serious safety accidents. Furthermore, replacing deformed axial shafts is costly, requiring complete replacement, and also causes equipment downtime, impacting operational efficiency. Utility Model Content

[0005] The purpose of this invention is to provide a safety control system for fork shaft deformation to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a fork axial deformation safety control system, including a fork frame assembly, and further comprising: Both the left and right tandem shafts are fixedly mounted on the fork frame assembly, and the left and right tandem shafts are arranged coaxially. The left and right forks are slidably mounted on the left or right axial shaft, respectively. The right fork moving cylinder and the left fork moving cylinder are symmetrically mounted on the fork frame assembly at their ends, and their output ends respectively drive the left fork or the right fork to move along the axis where the left axial shaft and the right axial shaft are coaxial. The lower part of both the left and right axial shafts is provided with U-shaped slots at the connection points with the fork frame assembly, and fixed resistance strain gauges are fixedly connected inside the U-shaped slots.

[0007] Preferably, the fixed resistance strain gauge is attached to the lower U-shaped groove of the left or right tandem shaft in the form of a Wheatstone bridge. When the left and right forks are carrying goods, or when the left and right forks are picking up goods by a single fork, the left and right tandem shafts generate micro-strain, which causes the resistance value of the fixed resistance strain gauge to change.

[0008] Preferably, it also includes a signal amplifier module for amplifying and conditioning the voltage signal generated by the change in resistance value of the fixed resistance strain gauge.

[0009] Preferably, the system also includes an audible and visual alarm unit, which is installed in the driver's cab. If the value detected by the fixed resistance strain gauge exceeds the rated load threshold, the system will immediately trigger an audible and visual alarm and restrict the lifting operation.

[0010] Preferably, both the left and right forks have upper hooks at their ends, and the left and right forks are slidably mounted on the left or right spool using the upper hooks.

[0011] Preferably, the U-shaped groove is fixedly connected to a fixed resistance strain gauge by a composite adhesive material, which is an industrial-grade hot melt adhesive.

[0012] Compared with the prior art, the beneficial effects of this utility model are: This application utilizes fixed resistance strain gauges on the fork shaft to monitor the load on the tandem shaft in real time. It can directly measure the deformation parameters of the tandem shaft, which is of high accuracy and fast response, effectively ensuring the safety of forklift operation under extreme conditions. It provides an effective overload detection and real-time audible and visual alarm system, enabling the driver to detect overload conditions in advance, avoiding errors caused by relying entirely on subjective experience and judgment. This reduces the probability of fork / mast damage and cargo damage caused by tandem shaft failure, further reducing maintenance costs and improving operational efficiency. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall design of this utility model; Figure 2 This is a schematic diagram of the installation structure of the fixed resistance strain gauge and composite bonding material of this utility model; Figure 3 This is a control logic block diagram of the present invention.

[0014] In the diagram: 1. Left tandem shaft; 2. Right tandem shaft; 3. Left fork; 4. Right fork; 5. Right fork moving cylinder; 6. Left fork moving cylinder; 7. Fork frame assembly; 8. Fixed resistance strain gauge; 9. Composite bonding material. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] In the description of the embodiments of this utility model, it should be noted that the terms "inner", "outer", "upper", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed when in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0017] Please see Figure 1-3 In this embodiment of the present invention, a fork shaft deformation safety control system includes a fork frame assembly 7, and further includes: a left axial shaft 1 and a right axial shaft 2, both fixedly installed on the fork frame assembly 7, and the left axial shaft 1 and the right axial shaft 2 are arranged coaxially; a left fork 3 and a right fork 4, respectively slidably mounted on the left axial shaft 1 or the right axial shaft 2; a right fork moving cylinder 5 and a left fork moving cylinder 6, both with their ends symmetrically installed on the fork frame assembly 7, and their output ends respectively driving the left fork 3 or the right fork 4 to move along the axis where the left axial shaft 1 and the right axial shaft 2 are coaxial; the lower part of the left axial shaft 1 and the right axial shaft 2 are both provided with U-shaped slots at the connection positions with the fork frame assembly 7, and fixed resistance strain gauges 8 are fixedly connected inside the U-shaped slots.

[0018] Specifically, the descriptions of the left and right sides of the tandem shaft and forks in this application are based on the cab viewpoint. This limitation is for convenience only and does not represent a limitation in actual use. The fixed resistance strain gauge 8 is attached to the lower U-shaped slot of the left tandem shaft 1 or right tandem shaft 2 in the form of a Wheatstone bridge. Here, the Wheatstone bridge form is existing technology, briefly described as follows: The core of the bridge's operation is the "balance" state. Balance state: Adjust the resistance so that the reading of the galvanometer G is zero (i.e., the potentials at points B and D are equal). At this time, the bridge is balanced. Balance formula: When the bridge is balanced, the four resistors satisfy the following relationship: R1 / R2 = R3 / R4. This formula is the core of the Wheatstone bridge calculation. Measurement principle: Usually, we set R4 as the resistor to be measured, Rx. It is known that R1 and R2 are fixed ratio arms (the ratio is known), and R3 is an adjustable standard precision resistor. By adjusting R3 to balance the bridge, we can calculate the precise value of the unknown resistance Rx according to the formula Rx = R3 * (R2 / R1). Method: After the bridge circuit is initially balanced, the resistance of one of the resistors (usually a sensor) is varied with the measured physical quantity (such as temperature, pressure, strain). This disrupts the balance of the bridge, causing the galvanometer to produce a reading proportional to the change in resistance. Advantages: It allows for continuous, real-time measurement of dynamically changing physical quantities and facilitates automated measurement and data acquisition.

[0019] When the left fork 3 and right fork 4 are loaded with goods, or when a single fork of the left fork 3 and right fork 4 is picking up goods, the left axial shaft 1 and right axial shaft 2 generate micro-strain, causing a change in the resistance value of the fixed resistance strain gauge 8. When the resistance value of the fixed resistance strain gauge 8 changes, it breaks the bridge balance and outputs a weak voltage signal. This signal is amplified and conditioned, and then collected and processed in real time by the on-board controller. The preferred model of this on-board controller is TX T5G WG8711710040. The on-board controller converts the voltage value into accurate weight data and compares it with the rated load threshold. If the detected value exceeds the rated load threshold, the system immediately triggers an audible and visual alarm and restricts the lifting operation, achieving active overload protection. At the same time, the display screen in the cab reminds the driver to change the fork position or adjust the fork load.

[0020] At this time, the driver will recognize the alarm information, operate the electric control handle, and control the multi-way valve of the main hydraulic system to achieve active control. The hydraulic oil diverted by the multi-way valve precisely controls the oil supply to the right fork moving cylinder 5 and the left fork moving cylinder 6 to move the left fork 3 and the right fork 4. This avoids overloading of the left fork 3 and the right fork 4 at the point of maximum force in the middle of the shaft. If overload occurs again, the fixed resistance strain gauge 8 will feed back the strain signal of the shaft again, repeating the above process. That is, the on-board controller collects and processes data in real time to ensure that the shaft always works within the set load, thus achieving intelligent safety control.

[0021] This application utilizes fixed resistance strain gauges 8 on the fork shaft to monitor the load on the tandem shaft in real time. The principle is based on the physical relationship between elastic deformation and resistance change in metal, which is existing technology and will not be elaborated upon here. It can directly measure the deformation parameters of the load-bearing tandem shaft with high accuracy and fast response, effectively ensuring the safety of forklift operation under extreme conditions. It provides an effective overload detection and real-time audible and visual alarm system, enabling the driver to perceive overload conditions in advance, avoiding errors caused by relying entirely on subjective experience and judgment. This reduces the probability of fork / mast damage and cargo damage due to tandem shaft failure, further reducing maintenance costs and improving operational efficiency.

[0022] Furthermore, such as Figure 1 As shown, both the left fork 3 and the right fork 4 have upper hooks at their ends, and the left fork 3 and the right fork 4 are slidably mounted on the left spool 1 or the right spool 2 using the upper hooks.

[0023] Specifically, both the left fork 3 and the right fork 4 have upper hooks at their ends. The upper hooks are slidably attached to the left axial shaft 1 or the right axial shaft 2. The upper hooks can accurately transfer the left fork 3 and the right fork 4 to the left axial shaft 1 or the right axial shaft 2, and also ensure the normal lateral movement of the left fork 3 and the right fork 4.

[0024] like Figure 2 As shown, the U-shaped groove is fixedly connected to the fixed resistance strain gauge 8 by a composite adhesive material 9, which is an industrial-grade hot melt adhesive material.

[0025] Specifically, the composite bonding material 9 is an industrial-grade hot melt adhesive material, which effectively fixes the fixed resistance strain gauge 8, ensuring the accuracy of the force on the fixed resistance strain gauge 8 and improving the detection accuracy.

[0026] Although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0027] Therefore, the above description is only a preferred embodiment of this application and is not intended to limit the scope of this application; that is, all equivalent modifications made in accordance with the scope of the claims of this application shall be within the protection scope of the claims of this application.

Claims

1. A safety control system for fork shaft deformation, characterized in that, Including the forklift frame assembly (7), it also includes: The left tandem shaft (1) and the right tandem shaft (2) are both fixedly installed on the fork frame assembly (7), and the left tandem shaft (1) and the right tandem shaft (2) are arranged coaxially; The left fork (3) and the right fork (4) are slidably mounted on the left spool (1) or the right spool (2), respectively. The right fork moving cylinder (5) and the left fork moving cylinder (6) are symmetrically mounted on the fork frame assembly (7) at their ends, and their output ends respectively drive the left fork (3) or the right fork (4) to move along the axis where the left spool (1) and the right spool (2) are located. The lower part of the left tandem shaft (1) and the right tandem shaft (2) are both provided with U-shaped slots at the connection positions with the fork frame assembly (7), and fixed resistance strain gauges (8) are fixedly connected inside the U-shaped slots.

2. The fork shaft deformation safety control system according to claim 1, characterized in that: The fixed resistance strain gauge (8) is attached to the lower U-shaped groove of the left spool (1) or right spool (2) in the form of a Wheatstone bridge. When the left fork (3) and right fork (4) are carrying goods, or when the left fork (3) and right fork (4) are picking up goods by a single fork, the left spool (1) and right spool (2) will generate micro-strain, which will cause the resistance value of the fixed resistance strain gauge (8) to change.

3. The fork shaft deformation safety control system according to claim 2, characterized in that: It also includes a signal amplifier module for amplifying and conditioning the voltage signal generated by the change in resistance value of the fixed resistance strain gauge (8).

4. The fork shaft deformation safety control system according to claim 3, characterized in that: It also includes an audible and visual alarm unit, which is installed in the cab. If the value detected by the fixed resistance strain gauge (8) exceeds the rated load threshold, the system will immediately trigger an audible and visual alarm and restrict the lifting operation.

5. The fork shaft deformation safety control system according to claim 1, characterized in that: Both the left fork (3) and the right fork (4) have upper hooks at their ends. The left fork (3) and the right fork (4) are slidably mounted on the left spool (1) or the right spool (2) using the upper hooks.

6. The fork shaft deformation safety control system according to claim 1, characterized in that: The U-shaped grooves are all fixedly connected to fixed resistance strain gauges (8) by composite adhesive material (9), which is an industrial-grade hot melt adhesive material.

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