Forklift reduction gearbox test equipment and test method thereof

Abstract

The invention discloses forklift reduction gearbox test equipment and a test method thereof.The forklift reduction gearbox test equipment comprises a base and a connecting device, a motor is arranged on the base, the connecting device comprises a first connecting shaft assembly and a second connecting shaft assembly, and the first connecting shaft assembly and the second connecting shaft assembly are connected with the motor and a reduction gearbox respectively; the first connecting shaft assembly is arranged on the outer side of the second connecting shaft assembly in a sleeving mode, and an elastic torsion element is arranged between the first connecting shaft assembly and the second connecting shaft assembly. A clasping ring is arranged on the first connecting shaft assembly, and a top block is arranged between the clasping ring and the second connecting shaft assembly; the enclasping ring comprises a ring body, an expansion and contraction control body is arranged on the ring body, and when the temperature of the expansion and contraction control body rises, the diameter of the enclasping ring is increased; and when the temperature of the expansion and contraction control body is reduced, the diameter of the enclasping ring is reduced. According to the forklift reduction gearbox test equipment provided by the invention, through the innovative design of the connecting device, the problems of motor starting impact and insufficient precision of a flexible coupling in a traditional load test are effectively solved; and the purposes of buffering protection and accurate testing are considered.

Description

Technical Field

[0001] The present invention relates to the technical field of reduction gearbox testing, and in particular to a forklift reduction gearbox testing device and a testing method thereof. Background Art

[0002] Gearbox load testing is a crucial step in verifying its performance, reliability, and durability. During a load test, the gearbox's input shaft is connected to a motor, and its output shaft is connected to a torque load device. The motor applies a specific torque to the gearbox's input shaft, driving it to rotate. The gearbox's status during the test is recorded, allowing for an assessment of its reliability, durability, and other indicators.

[0003] However, during the test, at the moment of motor starting, the rotor accelerates rapidly from a stationary state to the rated speed, and its rotational inertia is directly transmitted to the reducer input shaft through the rigid connection. There is no effective buffering between the motor and the reducer, causing the gears, shafts, bearings and other components in the reducer to be subjected to a large impact, resulting in overload of the gears, shafts, bearings and other components in the reducer, which can easily damage the above components; and at the moment of motor starting, due to the inertia of the reducer, the motor cannot immediately drive the rotation of the reducer, causing the output shaft of the motor to "stallate", which can easily cause the internal winding of the motor to burn out.

[0004] In order to address the above problems, in some existing reducer load tests, the output shaft of the motor is connected to the input shaft of the reducer through a flexible coupling. Although the flexible coupling can play a certain buffering role at the moment of motor startup and protect the motor and reducer; however, the flexible coupling has a certain flexibility, which will cause torsional angle lag during the test, affecting the test accuracy of the dynamic torque response speed; and the elastic element (rubber) in the flexible coupling will experience stiffness changes under large torque, and there is a 5%-10% deviation between the torque measurement value and the actual transmission value, which introduces test errors and reduces the accuracy and reliability of the test results. Summary of the Invention

[0005] The purpose of the present invention is to solve the deficiencies in the prior art and to provide a forklift reduction gearbox testing device and a testing method thereof.

[0006] The objective of the present invention is achieved through the following technical solutions: A forklift reduction gearbox testing device, comprising a base and a connecting device, wherein a motor is provided on the base, the connecting device comprises a first coupling assembly and a second coupling assembly, the first coupling assembly and the second coupling assembly are respectively connected to the motor and the reduction gearbox; the first coupling assembly is sleeved on the outside of the second coupling assembly, and an elastic torsion element is provided between the first coupling assembly and the second coupling assembly; a clamping ring is provided on the first coupling assembly, and a top block is provided between the clamping ring and the second coupling assembly; the clamping ring comprises a ring body, and an expansion and contraction control body is provided on the ring body, and when the temperature of the expansion and contraction control body increases, the diameter of the clamping ring expands; when the temperature of the expansion and contraction control body decreases, the diameter of the clamping ring decreases; and a heating device for heating the clamping ring is also included.

[0007] Preferably, before the motor is started, the expansion and contraction control body is heated by a heating device so that the clamping ring reaches the target diameter state, and at this time the first coupling assembly and the second coupling assembly are in an elastic connection state; after the motor is started, the diameter of the clamping ring gradually shrinks until it reaches a tightened state. When the clamping ring is in the tightened state, the contraction force of the clamping ring causes the top block to press against the outside of the second coupling assembly, thereby making the second coupling assembly and the second coupling assembly in a rigid connection state.

[0008] Preferably, the clamping ring includes a ring body, on which an expansion and contraction control body is provided, the expansion and contraction control body is in a "C" shape, and both ends of the expansion and contraction control body are connected to the ring body; the expansion and contraction control body is composed of an outer material layer and an inner material layer, and the thermal expansion coefficient of the outer material layer is smaller than the thermal expansion coefficient of the inner material layer; the heating device includes a lifting drive mechanism and a heating component provided on the lifting drive mechanism, the heating component is located directly below the clamping ring, and the heating component is provided with a heating groove matching the expansion and contraction control body.

[0009] Preferably, before the motor is started, the expansion and contraction control body is heated to a target temperature by a heating device so that the clamping ring reaches a target diameter state. The target temperature T of the expansion and contraction control body is calculated by the following formula: ; in, is the initial ambient temperature, The target diameter of the clamping ring after heating. The initial diameter of the clamping ring before heating. is the thermal expansion coefficient of the inner material layer, is the thermal expansion coefficient of the outer material layer, is the curvature radius of the expansion and contraction control body, is the correction factor.

[0010] Preferably, the lifting drive mechanism includes a fixed frame and a lifting seat, the fixed frame is provided with a lifting drive member, the lifting drive member is connected to the lifting seat, and the heating component is provided on the lifting seat; the lifting seat is provided with a guide rod, and the fixed frame is provided with a guide hole corresponding to the guide rod, and the guide rod and the guide hole are slidably engaged.

[0011] Preferably, the first coupling assembly includes a first drum and a first sleeve, the second coupling assembly includes a second drum and a second sleeve, the first drum sleeve is arranged on the outside of the second drum sleeve; a plurality of guide holes are provided on the edge of the first drum, the guide holes are arranged along the diameter direction of the first drum, and the top blocks are arranged in the guide holes; an annular groove for constraining the clamping ring is also provided on the outside of the first drum, and the clamping ring is arranged in the annular groove.

[0012] Preferably, the elastic torsion element is a torsion bar, and both ends of the torsion bar are connected to the first rotating drum and the second rotating drum respectively.

[0013] Preferably, a first press-fitting hole is provided at the center of the first drum, and a second press-fitting hole is provided at the center of the second drum. One end of the torsion bar is installed in the first press-fitting hole and has an interference fit with the first press-fitting hole, and the other end of the torsion bar is installed in the second press-fitting hole and has an interference fit with the second press-fitting hole.

[0014] Preferably, a first guide rail is provided on the base, a first sliding base is slidably connected to the first guide rail, and a mounting bracket for fixing the reduction gearbox is provided on the first sliding base; a second guide rail is provided on the base, a second sliding base is slidably provided on the second guide rail, and a torque load device is provided on the second sliding base, and the torque load device is used to connect the output shaft of the reduction gearbox.

[0015] A test method for a forklift reduction gearbox test device, the specific method is as follows: Fix the reduction gearbox to be tested to the reduction gearbox mounting portion, connect the input shaft of the motor to the first coupling assembly on the connecting device, and connect the input shaft of the reduction gearbox to the second coupling assembly on the connecting device; Before the motor is started, the clamping ring on the connecting device is rotated to the heating state. When the clamping ring is in the heating state, the expansion and contraction control body on the clamping ring is facing the heating component. The heating component is driven up by the lifting drive mechanism and brought close to the expansion and contraction control body. The expansion and contraction control body is heated by the heating component so that the clamping ring reaches the target diameter state. The heating component then stops heating and descends to its initial position. Then the motor starts, and the torsion bar causes relative rotation between the first coupling assembly and the second coupling assembly to achieve buffering of the motor starting moment; At the same time, the expansion and contraction control body gradually cools down to room temperature; as the temperature of the expansion and contraction control body drops, the diameter of the clamping ring gradually shrinks until it reaches a tightened state; when the clamping ring is in the tightened state, the contraction force of the clamping ring causes the top block to press against the outer side of the second coupling assembly, thereby making the second coupling assembly and the second coupling assembly in a rigid connection state.

[0016] The beneficial effects of the present invention are as follows: the forklift reduction gearbox test equipment proposed in the present invention effectively solves the problems of motor starting impact and insufficient precision of flexible coupling in traditional load tests through innovative connection device design; the connection device takes into account the purposes of buffering protection and precise testing by adopting dual mode switching; before the motor is started, the first coupling assembly and the second coupling assembly are in an elastic connection state; in this state, the instantaneous start of the motor will cause a relative torque angle to be generated between the first coupling assembly and the second coupling assembly, and part of the impact force at the moment of motor starting will be absorbed by the torsion bar, absorbing the rotational inertia impact at the moment of motor starting, and playing a good buffering effect on the starting moment of the motor through the torsion bar, avoiding the gears, shafts, bearings and other components in the reduction gearbox from being overloaded due to rigid connection, reducing the risk of mechanical damage, and also alleviating the motor "stall" phenomenon, reducing the probability of winding burnout, and protecting the safety of the motor; in the process after the motor is started, the first coupling assembly and the second coupling assembly form a rigid connection; after the first coupling assembly and the second coupling assembly form a rigid connection state, the elastic element in the connection device will not play a role, thereby eliminating the "torsion angle lag" of the flexible coupling. It can solve the problem and ensure the test accuracy of dynamic torque response speed; at the same time, it can also avoid the torque measurement deviation caused by the stiffness change of elastic elements under large torque, thereby effectively improving the accuracy and reliability of test data. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention.

[0018] Figure 2 Schematic diagram of the structure of the heating device.

[0019] Figure 3 Schematic diagram of the structure of the connecting device.

[0020] Figure 4 A cross-sectional view of the connecting device.

[0021] Figure 5 This is a structural diagram of the first coupling assembly in one direction.

[0022] Figure 6 This is a schematic structural diagram of the first coupling assembly in another direction.

[0023] Figure 7 It is a structural schematic diagram of the second coupling assembly.

[0024] Figure 8 Schematic diagram of the structure of the hoop.

[0025] Figure 9 A cross-sectional view of the hoop body.

[0026] In the figure: 1. Base, 2. Motor, 3. Bracket, 4. Torque sensor, 5. Connecting device, 5-1. First coupling assembly, 5-1-1. First drum, 5-1-2. First bushing, 5-1-3. Annular groove, 5-1-4. Guide hole, 5-1-5. First press-fit hole, 5-2. Second coupling assembly, 5-2-1. Second drum, 5-2-2. Second bushing, 5-2-3. Second press-fit hole, 5-3. Clamping ring, 5-3-1. Ring body , 5-3-2, expansion and contraction control body, 5-3-2a, outer material layer, 5-3-2b, inner material layer, 5-4, top block, 5-5, torsion bar, 6, heating device, 6-1, fixed frame, 6-2, lifting seat, 6-3, heating component, 6-4, wire, 6-5, lifting drive, 6-6, guide rod, 7, first sliding base, 8, mounting frame, 9, first guide rail, 10, torque load device, 11, second sliding base, 12, second guide rail. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention are within the scope of protection of the present invention.

[0028] It should be understood by those skilled in the art that, in the disclosure of the present invention, the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0029] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the elements may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0030] like Figures 1 to 9As shown, a forklift reduction gearbox testing equipment includes a base 1 and a connecting device 5. The base 1 is provided with a motor 2. The connecting device 5 includes a first coupling assembly 5-1 and a second coupling assembly 5-2. The first coupling assembly 5-1 and the second coupling assembly 5-2 are respectively connected to the motor 2 and the reduction gearbox; the first coupling assembly 5-1 is sleeved on the outside of the second coupling assembly 5-2, and an elastic torsion element is provided between the first coupling assembly 5-1 and the second coupling assembly 5-2; a clamping ring 5-3 is provided on the first coupling assembly 5-1, and a top block 5-4 is provided between the clamping ring 5-3 and the second coupling assembly 5-2; the clamping ring 5-3 includes a ring body 5-3-1, and an expansion and contraction control body 5-3-2 is provided on the ring body 5-3-1. When the temperature of the expansion and contraction control body 5-3-2 increases, the diameter of the clamping ring 5-3 expands; when the temperature of the expansion and contraction control body 5-3-2 decreases, the diameter of the clamping ring 5-3 decreases; and a heating device 6 for heating the clamping ring 5-3 is also included.

[0031] Before the motor 2 is started, the expansion and contraction control body 5-3-2 is heated by the heating device 6 to make the clamping ring 5-3 reach the target diameter state. At this time, the first coupling assembly 5-1 and the second coupling assembly 5-2 are in an elastic connection state; after the motor 2 is started, the diameter of the clamping ring 5-3 gradually shrinks until it reaches a tightened state. When the clamping ring 5-3 is in the tightened state, the contraction force of the clamping ring 5-3 causes the top block 5-4 to press against the outer side of the second coupling assembly 5-2, thereby making the second coupling assembly 5-2 and the second coupling assembly 5-2 in a rigid connection state.

[0032] The forklift gearbox test equipment proposed in this invention effectively addresses the issues of motor 2 startup impact and the insufficient precision of the flexible coupling in traditional load tests through the innovative design of the connection device 5. The connection device 5 utilizes dual-mode switching, achieving both buffer protection and precise testing.

[0033] Before starting the motor 2, the heating device 6 first heats the clamping ring 5-3 to increase the diameter of the clamping ring 5-3 to the target diameter state; at the moment of starting the motor 2, since the clamping ring 5-3 is in a high temperature state, the diameter of the clamping ring 5-3 is large at this time, and the clamping cannot produce a contraction force on the top block 5-4, and the top block 5-4 cannot produce a tightening effect on the second coupling assembly 5-2, so that the first coupling assembly 5-1 and the second coupling assembly 5-2 have a certain torsional space under the constraint of the elastic torsion element. At this time, the first coupling assembly 5-1 and the second coupling assembly 5-2 are in an elastic connection state; in this state, the instantaneous starting of the motor 2 will cause a relative torque angle to be generated between the first coupling assembly 5-1 and the second coupling assembly 5-2, and part of the impact force at the moment of starting the motor 2 will be absorbed by the torsion bar 5-5, absorbing the impact of the moment of inertia of the motor 2 at the moment of starting, and the torsion bar 5-5 has a good buffering effect on the starting moment of the motor 2, avoiding the gears, shafts, bearings and other components in the reduction gear box from being overloaded due to the rigid connection, reducing the risk of mechanical damage, and also alleviating the risk of motor 2 The "stall" phenomenon is reduced, the probability of winding burning is reduced, and the safety of motor 2 is protected.

[0034] Within a short period of time after motor 2 starts, motor 2 and the reducer are in a stable operating state. During this period, the expansion and contraction control body 5-3-2 on the clamping ring 5-3 cools to room temperature. As the temperature of the clamping ring 5-3 and the expansion and contraction control body 5-3-2 drops, the diameter of the clamping ring 5-3 gradually shrinks to a "tightened state." At this point, the contraction of the clamping ring 5-3 causes the top block 5-4 to rigidly press the second coupling assembly 5-2, thereby locking the first coupling assembly 5-1 and the second coupling assembly 5-2, forming a rigid connection between the first coupling assembly 5-1 and the second coupling assembly 5-2. After the first coupling assembly 5-1 and the second coupling assembly 5-2 form a rigid connection state, the elastic element (elastic torsion element) in the connecting device 5 will not play a role, which can eliminate the "torsion angle lag" problem of the flexible coupling and ensure the test accuracy of the dynamic torque response speed; at the same time, it can also avoid the torque measurement deviation caused by the stiffness change of the elastic element (such as rubber) under large torque (the deviation of traditional flexible couplings is 5%-10%), thereby effectively improving the accuracy and reliability of the test data.

[0035] Wherein, the clamping ring 5-3 includes a ring body 5-3-1, on which an expansion and contraction control body 5-3-2 is provided, the expansion and contraction control body 5-3-2 is "C"-shaped, and both ends of the expansion and contraction control body 5-3-2 are connected to the ring body 5-3-1; the expansion and contraction control body 5-3-2 is composed of an outer material layer 5-3-2a and an inner material layer 5-3-2b, and the thermal expansion coefficient of the outer material layer 5-3-2a is smaller than the thermal expansion coefficient of the inner material layer 5-3-2b; the heating device 6 includes a lifting drive mechanism and a heating component 6-3 provided on the lifting drive mechanism, the heating component 6-3 is located directly below the clamping ring 5-3, and the heating component 6-3 is provided with a heating groove matching the expansion and contraction control body 5-3-2.

[0036] The expansion and contraction control body 5-3-2 is used to control the locking or expansion of the clamping ring 5-3. The expansion and contraction control body 5-3-2 is "C"-shaped and consists of an outer material layer 5-3-2a and an inner material layer 5-3-2b. The thermal expansion coefficient of the outer material layer 5-3-2a is smaller than that of the inner material layer 5-3-2b. When the temperature of the expansion and contraction control body 5-3-2 rises, the thermal expansion of the outer material layer 5-3-2a in the expansion and contraction control body 5-3-2 will be greater than the expansion of the inner material layer 5-3-2b, thereby increasing the distance between the two ends of the expansion and contraction control body 5-3-2 (i.e., the opening of the expansion and contraction control body 5-3-2 becomes larger). The increase in the opening of the expansion and contraction control body 5-3-2 will cause the diameter of the clamping ring 5-3 to expand. Conversely, when the temperature of the expansion and contraction control body 5-3-2 drops, the distance between the two ends of the expansion and contraction control body 5-3-2 decreases (i.e., the opening of the expansion and contraction control body 5-3-2 becomes smaller). The reduction in the opening of the expansion and contraction control body 5-3-2 will cause the diameter of the clamping ring 5-3 to decrease, causing the clamping ring 5-3 to tighten. In this embodiment, the ring body 5-3-1 is made of spring steel and has a certain degree of elasticity.

[0037] The heating component 6-3 is mounted on a lifting drive mechanism and is driven to move up and down by the lifting drive mechanism. When the expansion and contraction control body 5-3-2 needs to be heated, the heating component 6-3 is raised to the heating position. At this time, the heating component 6-3 is close to the expansion and contraction control body 5-3-2, and the diffusion control body just enters the heating groove on the heating component 6-3, thereby facilitating heating of the diffusion control body. When heating is completed, the heating component 6-3 is lowered to the initial position, so that the heating component 6-3 is away from the clamping ring 5-3, thereby avoiding interference with the rotation of the clamping ring 5-3.

[0038] Among them, the shape of the heating groove is consistent with the outer contour of the "C"-shaped expansion and contraction control body 5-3-2, ensuring that the heat of the heating component 6-3 is concentrated on the outer material layer 5-3-2a of the expansion and contraction control body 5-3-2, avoiding the heat from spreading to other parts of the ring body 5-3-1, and improving the heating efficiency.

[0039] In this embodiment, the heating component 6-3 is an electric heater or a high-frequency heater. The heating component 6-3 is provided with an electric wire 6-4, which is connected to an external power source through the electric wire 6-4.

[0040] Furthermore, before the motor is started, the expansion and contraction control body is heated to a target temperature by a heating device so that the clamping ring reaches a target diameter state. The target temperature T of the expansion and contraction control body is calculated by the following formula: ; in, is the initial temperature of the environment, in units of (°C); The target diameter of the clamping ring after heating, the unit is (mm), The initial diameter of the clamping ring before heating, in mm. is the thermal expansion coefficient of the inner material layer, and its unit is (1 / °C); is the thermal expansion coefficient of the outer material layer, and its unit is (1 / °C); is the curvature radius of the expansion and contraction control body, its unit is (mm); is the correction coefficient, which is a constant.

[0041] Among them, the correction coefficient is the empirical coefficient, the correction coefficient The value range is between 1.1 and 1.3.

[0042] In the present invention, the target temperature of the expansion and contraction control body 5-3-2 is accurately calculated by the above formula, so that the clamping ring 5-3 can accurately reach the predetermined target diameter state.

[0043] The lifting drive mechanism includes a fixed frame 6-1 and a lifting base 6-2. The fixed frame 6-1 is provided with a lifting drive member connected to the lifting base 6-2. The heating element 6-3 is mounted on the lifting base 6-2. The lifting base 6-2 is provided with a guide rod 6-6. The fixed frame 6-1 is provided with a guide hole 5-1-4 corresponding to the guide rod 6-6. The guide rod 6-6 slidably engages with the guide hole 5-1-4. The lifting drive member drives the lifting base 6-2 up and down, thereby driving the heating element 6-3 up and down. In this embodiment, the lifting drive member is an electric push rod.

[0044] The first coupling assembly 5-1 includes a first drum 5-1-1 and a first sleeve 5-1-2. The second coupling assembly 5-2 includes a second drum 5-2-1 and a second sleeve 5-2-2. The first drum sleeve 5-1-1 is located outside the second drum sleeve 5-2-1. Several guide holes 5-1-4 are provided along the top of the first drum 5-1-1. These guide holes 5-1-4 are arranged along the diameter of the first drum 5-1-1, and the top blocks 5-4 are located in the guide holes 5-1-4. An annular groove 5-1-3 is also provided on the outside of the first drum 5-1-1 for constraining the clamping ring 5-3. The clamping ring 5-3 is located in the annular groove 5-1-3. Both the first drum 5-1-1 and the second drum are cylindrical, with the inner diameter of the first drum being the same as the outer diameter of the second drum. Guide holes 5-1-4 are distributed in a circular array on the first drum 5-1-1. The top block 5-4 is placed in the guide holes 5-1-4 so that the top block 5-4 can only move radially along the first drum 5-1-1. The clamping ring 5-3 is set in the annular groove 5-1-3 and is constrained by the annular groove 5-1-3 to prevent the clamping ring 5-3 from detaching from the first drum 5-1-1.

[0045] In this embodiment, the elastic torsion element is a torsion bar 5-5, the ends of which are connected to the first drum 5-1-1 and the second drum, respectively. The torsion bar 5-5 has a circular cross-section, with the diameters at the ends being larger than the diameter at the center. In this embodiment, the torsion bar 5-5 is made of chrome-vanadium spring steel.

[0046] In order to realize the installation of the torsion bar 5-5, a first press-fitting hole 5-1-5 is provided at the center of the first rotating drum 5-1-1, and a second press-fitting hole 5-2-3 is provided at the center of the second rotating drum 5-2-1. One end of the torsion bar 5-5 is installed in the first press-fitting hole and has an interference fit with the first press-fitting hole, and the other end of the torsion bar 5-5 is installed in the second press-fitting hole and has an interference fit with the second press-fitting hole.

[0047] A first guide rail 9 is provided on the base 1, to which a first sliding base 7 is slidably connected, and a mounting bracket 8 for fixing the reduction gearbox is provided on the first sliding base 7; a second guide rail 12 is provided on the base 1, to which a second sliding base 11 is slidably connected, and a torque load device 10 is provided on the second sliding base 11, and the torque load device 10 is used to connect to the output shaft of the reduction gearbox. When testing the reduction gearbox, the reduction gearbox is fixed to the mounting bracket 8, and the reduction gearbox is fixedly connected to the mounting bracket 8 by bolts. The mounting bracket 8 is provided with a number of bolt holes for fixing the reduction gearbox. By translating the first and second sliding bases 11 on the guide rails, the relative position of the reduction gearbox and the torque load device 10 can be fine-tuned, so that the output shaft and the load shaft can be quickly aligned. At the same time, high-precision calibration can be achieved in conjunction with a dial indicator or laser alignment instrument. In addition, a guide rail locking mechanism is provided between the first sliding base 7 and the first guide rail 9, and a guide rail locking mechanism is also provided between the second sliding base 11 and the second guide rail 12. After the first sliding base 7 and the second sliding base 11 are moved to the target position, the sliding bases are locked by the guide rail locking mechanism.

[0048] A test method for a forklift reduction gearbox test device, the specific method is as follows: Fix the reduction gearbox to be tested to the reduction gearbox mounting portion, connect the input shaft of the motor 2 to the first coupling assembly 5-1 on the connecting device 5, and connect the input shaft of the reduction gearbox to the second coupling assembly 5-2 on the connecting device 5; Before starting, the motor 2 rotates the clamping ring 5-3 on the connecting device 5 to the heating state. When the clamping ring 5-3 is in the heating state, the expansion and contraction control body 5-3-2 on the clamping ring 5-3 faces the heating component 6-3. The heating component 6-3 is driven up by the lifting drive mechanism and is brought close to the expansion and contraction control body 5-3-2. The expansion and contraction control body 5-3-2 is heated by the heating component 6-3 so that the clamping ring 5-3 reaches the target diameter state. Then, the heating component 6-3 stops heating and descends to its initial position. Then the motor 2 is started, and the first coupling assembly 5-1 and the second coupling assembly 5-2 are caused to rotate relative to each other through the torsion bar 5-5, so as to achieve a buffering effect on the starting moment of the motor 2; At the same time, the expansion and contraction control body 5-3-2 gradually cools down to room temperature; as the temperature of the expansion and contraction control body 5-3-2 drops, the diameter of the clamping ring 5-3 gradually shrinks until it reaches a tightened state; when the clamping ring 5-3 is in the tightened state, the contraction force of the clamping ring 5-3 causes the top block 5-4 to press against the outer side of the second coupling assembly 5-2, thereby making the second coupling assembly 5-2 and the second coupling assembly 5-2 in a rigid connection state.

[0049] The present invention is not limited to the above-mentioned optimal implementation mode. Anyone can derive other forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, any technical solution that is the same or similar to that of the present application falls within the scope of protection of the present invention.

Claims

1. A forklift reduction gearbox testing equipment, characterized in that: It includes a base and a connecting device. The base is provided with a motor. The connecting device includes a first coupling assembly and a second coupling assembly. The first coupling assembly and the second coupling assembly are respectively connected to the motor and the reduction box; the first coupling assembly is sleeved on the outside of the second coupling assembly, and an elastic torsion element is provided between the first coupling assembly and the second coupling assembly; the first coupling assembly is provided with a clamping ring, and a top block is provided between the clamping ring and the second coupling assembly; the clamping ring includes a ring body, and an expansion and contraction control body is provided on the ring body. When the temperature of the expansion and contraction control body increases, the diameter of the clamping ring expands; when the temperature of the expansion and contraction control body decreases, the diameter of the clamping ring decreases; and it also includes a heating device for heating the clamping ring.

2. A forklift reduction gearbox testing device according to claim 1, characterized in that: Before the motor starts, the expansion and contraction control body is heated by the heating device so that the clamping ring reaches the target diameter state. At this time, the first coupling assembly and the second coupling assembly are in an elastic connection state; After the motor is started, the diameter of the clamping ring gradually decreases until it reaches a tightened state. When the clamping ring is in the tightened state, the contraction force of the clamping ring causes the top block to press against the outer side of the second coupling assembly, thereby making the second coupling assembly and the second coupling assembly in a rigid connection state.

3. A forklift reduction gearbox testing device according to claim 2, characterized in that: The clamping ring includes a ring body, on which an expansion and contraction control body is provided. The expansion and contraction control body is C-shaped, and both ends of the expansion and contraction control body are connected to the ring body. The expansion and contraction control body is composed of an outer material layer and an inner material layer. The thermal expansion coefficient of the outer material layer is smaller than the thermal expansion coefficient of the inner material layer. The heating device includes a lifting drive mechanism and a heating component arranged on the lifting drive mechanism. The heating component is located directly below the clamping ring and is provided with a heating groove that matches the expansion and contraction control body.

4. A forklift reduction gearbox testing device according to claim 3, characterized in that: Before the motor starts, the expansion and contraction control body is heated to the target temperature by the heating device so that the clamping ring reaches the target diameter state. The target temperature T of the expansion and contraction control body is calculated by the following formula: ； in, is the initial ambient temperature, The target diameter of the clamping ring after heating. The initial diameter of the clamping ring before heating. is the thermal expansion coefficient of the inner material layer, is the thermal expansion coefficient of the outer material layer, is the curvature radius of the expansion and contraction control body, is the correction factor.

5. The forklift reduction gearbox testing equipment according to claim 3, characterized in that: The lifting drive mechanism includes a fixed frame and a lifting seat. The fixed frame is provided with a lifting drive member, which is connected to the lifting seat. The heating component is provided on the lifting seat. The lifting seat is provided with a guide rod. The fixed frame is provided with a guide hole corresponding to the guide rod. The guide rod and the guide hole are slidably matched.

6. The forklift reduction gearbox testing equipment according to claim 1, characterized in that: The first coupling assembly includes a first rotating drum and a first shaft sleeve, and the second coupling assembly includes a second rotating drum and a second shaft sleeve, and the first rotating drum sleeve is arranged on the outside of the second rotating drum sleeve; a plurality of guide holes are provided on the edge of the first rotating drum, and the guide holes are arranged along the diameter direction of the first rotating drum, and the top block is arranged in the guide hole; an annular groove for constraining the clamping ring is also provided on the outside of the first rotating drum, and the clamping ring is arranged in the annular groove.

7. The forklift reduction gearbox testing equipment according to claim 6, characterized in that: The elastic torsion element is a torsion bar, and two ends of the torsion bar are respectively connected to the first rotating drum and the second rotating drum.

8. The forklift reduction gearbox testing equipment according to claim 7, characterized in that: A first press-fitting hole is provided at the center of the first rotating drum, and a second press-fitting hole is provided at the center of the second rotating drum. One end of the torsion bar is installed in the first press-fitting hole and has an interference fit with the first press-fitting hole, and the other end of the torsion bar is installed in the second press-fitting hole and has an interference fit with the second press-fitting hole.

9. The forklift reduction gearbox testing equipment according to claim 1, characterized in that: The base is provided with a first guide rail, a first sliding base is slidably connected to the first guide rail, and a mounting bracket for fixing the reduction gearbox is provided on the first sliding base; the base is provided with a second guide rail, a second sliding base is slidably provided on the second guide rail, and a torque load device is provided on the second sliding base, and the torque load device is used to connect the output shaft of the reduction gearbox.

10. A test method for a forklift reduction gearbox test device according to claim 5, characterized in that: The specific method is as follows: Fix the reduction gearbox to be tested to the reduction gearbox mounting portion, connect the input shaft of the motor to the first coupling assembly on the connecting device, and connect the input shaft of the reduction gearbox to the second coupling assembly on the connecting device; Before the motor is started, the clamping ring on the connecting device is rotated to the heating state. When the clamping ring is in the heating state, the expansion and contraction control body on the clamping ring is facing the heating component. The heating component is driven up by the lifting drive mechanism and brought close to the expansion and contraction control body. The expansion and contraction control body is heated by the heating component so that the clamping ring reaches the target diameter state. The heating component then stops heating and descends to its initial position. Then the motor starts, and the torsion bar causes relative rotation between the first coupling assembly and the second coupling assembly to achieve buffering of the motor starting moment; At the same time, the expansion and contraction control body gradually cools down to room temperature; as the temperature of the expansion and contraction control body drops, the diameter of the clamping ring gradually shrinks until it reaches a tightened state; when the clamping ring is in the tightened state, the contraction force of the clamping ring causes the top block to press against the outer side of the second coupling assembly, thereby making the second coupling assembly and the second coupling assembly in a rigid connection state.

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