A real-time torque testing device for electric forklift drive motor

Abstract

The present invention discloses a real-time torque testing device for an electric forklift driving motor, wherein a torque testing device is installed at a gap between a forklift box bridge assembly and a driving motor on a frame; the torque testing device comprises a mounting plate, a mounting seat is connected to the mounting plate, a torque sensor is installed on the mounting seat, a spline flange and a flat key flange are installed at both ends of the torque sensor, the spline end of the spline flange is inserted into the input end of the forklift box bridge assembly, and the flat key end of the flat key flange is connected to the output shaft of the driving motor. By installing a torque testing device between the forklift box bridge assembly and the driving motor, real-time torque detection and collection are achieved; an integrated positioning step is installed on both sides of the rotor, and the spline flange and the flat key flange are fixed to both ends of the rotor by screws, thereby ensuring the coaxial positioning of the input shaft of the forklift box bridge assembly and the output shaft of the driving motor.

Description

Technical Field

[0001] The present patent application relates to the technical field of electric forklifts, and in particular to a real-time torque testing device for a driving motor of an electric forklift. Background Art

[0002] Real-time torque detection and acquisition of the drive motor in the whole vehicle state has always been a problem that has plagued electric forklifts. There are two main difficulties. First, the structure of the electric forklift is relatively compact, and there is insufficient space inside the vehicle body to arrange the direct-connected torque sensor commonly used in the industry. On the other hand, the drive motor is usually directly connected to the gearbox and fixed on the gearbox housing, and the motor output shaft and the gearbox input shaft are directly coaxially positioned. If a torque sensor is directly added between the two, not only will the input motor be unable to be installed on the whole vehicle, but there is also no way to ensure the coaxiality between the motor output shaft, the torque sensor, and the gearbox input shaft. The industry's torque test method for this type of transmission system usually uses imported special strain stickers and sticks them in the modified drive shaft, but this method is expensive, and the cost of each test ranges from hundreds of thousands to hundreds of thousands. To this end, we propose a real-time torque test device for the drive motor of an electric forklift. Summary of the invention

[0003] In view of the above-mentioned shortcomings of the prior art, the purpose of this patent application is to provide a real-time torque testing device for an electric forklift drive motor to solve the above-mentioned problems of the prior art.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A real-time torque test device for a driving motor of an electric forklift, comprising a vehicle frame, a forklift box-bridge assembly fixed to the vehicle frame through a bridge housing and a second connecting bolt, the vehicle frame is further connected to a driving motor through the first connecting bolt, and a torque test device is installed in the gap between the forklift box-bridge assembly and the driving motor on the vehicle frame;

[0006] The torque testing device includes a mounting plate, a mounting base is connected to the mounting plate, a torque sensor is installed on the mounting base, a spline flange and a flat key flange are installed at both ends of the torque sensor, the spline end of the spline flange is inserted into the input end of the forklift box bridge assembly, and the flat key end of the flat key flange is connected to the output shaft of the drive motor.

[0007] Furthermore, the torque sensor includes a stator fixed on a mounting seat, a rotor rotatably connected inside the stator, and two ends of the rotor are respectively connected and fixed to a spline flange and a key flange.

[0008] Furthermore, the rotor has an outwardly extending positioning step integrally connected in the middle of both ends, and the rotor has a plurality of threaded holes equidistantly distributed in an annular direction located on the circumference of the positioning step. The flange ends of the spline flange and the key flange are provided with grooves that match and plug into the corresponding positioning steps, and the flange ends of the spline flange and the key flange are connected to the rotor via screws passing through the threaded holes.

[0009] Furthermore, the mounting base is connected to a signal line for receiving a voltage signal of the torque sensor.

[0010] Furthermore, a connecting frame is connected between the forklift box bridge assembly and the drive motor, one end of the connecting frame is connected to a box bridge assembly positioning step inserted on the side wall of the forklift box bridge assembly, and the other end of the connecting frame is connected to a limiting ring whose one side is connected to the side wall of the drive motor, and the mounting plate is detachably connected to the connecting frame.

[0011] Furthermore, a plurality of U-shaped mounting holes distributed in a matrix are formed at the end edge of the mounting plate, and the mounting plate is locked on the connecting frame by pins passing through the U-shaped mounting holes.

[0012] Furthermore, an oil-sealing paper pad is provided at the connection between the end of the forklift box bridge assembly and the connecting frame, and a skeleton oil seal is provided between the positioning step of the box bridge assembly and the spline flange.

[0013] Furthermore, a screw hole is provided on the bottom plate of the output shaft of the driving motor, and the flat key flange is screwed into the screw hole through a locking bolt passing through the flat key flange and fixedly connected to the output shaft of the driving motor.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. By installing a torque test device between the forklift box bridge assembly and the drive motor, real-time torque detection and collection can be achieved;

[0016] 2. Install integrated positioning steps on both sides of the rotor, and then fix the spline flange and key flange on both ends of the rotor through screws to ensure the coaxial positioning of the forklift box bridge assembly input shaft and the drive motor output shaft;

[0017] 3. The torque test device is detachably connected to the connecting frame through the locking bolt passing through the U-shaped hole on the mounting plate, realizing detachable installation, and the torque test device can be reused;

[0018] 4. This electric forklift drive motor torque test device has the characteristics of ingenious structure, low cost, high consistency between the collected data and the actual situation of the whole vehicle, and the detection equipment can be reused. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1This is a schematic diagram of the layout structure of the internal drive and transmission system of the electric forklift of the present invention;

[0020] Figure 2 It is a schematic diagram of the structure of the torque testing device of the present invention;

[0021] Figure 3 It is a schematic diagram of the three-dimensional structure of the torque testing device of the present invention;

[0022] Figure 4 It is a schematic diagram of the three-dimensional structure of the active torque testing device of the present invention connected with the forklift box bridge assembly and the driving motor;

[0023] Figure 5 It is a schematic diagram of the structure used for assembling the present invention.

[0024] Explanation of the accompanying figures: bridge housing Haval 1, forklift box bridge assembly 2, first connecting bolt 3, drive motor 4, second connecting bolt 5, frame 6, torque testing device 7, stator 71, mounting seat 72, mounting plate 73, rotor 74, threaded hole 75, positioning step 76, signal line 77, spline flange 8, flat key flange 9, connecting frame 10, box bridge assembly positioning step 11, limit ring 12, oil sealing paper pad 13, skeleton oil seal 14, locking bolt 15. DETAILED DESCRIPTION

[0025] The following describes the implementation of the present patent application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present patent application from the content disclosed in this specification. The present patent application can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present patent application. It should be noted that the embodiments and features in the embodiments in the present application can be combined with each other without conflict.

[0026] See also Figure 1-5 , the present invention provides a technical solution:

[0027] A real-time torque test device for an electric forklift drive motor, such as Figure 1 and Figure 2 As shown, it includes a frame 6, a forklift box bridge assembly 2 fixed to the frame 6 through a bridge housing 1 and a second connecting bolt 5, a drive motor 4 is also connected to the frame 6 through a first connecting bolt 3, and a torque testing device 7 is installed in the gap between the forklift box bridge assembly 2 and the drive motor 4 on the frame 6.

[0028] like Figure 3 and Figure 4As shown, the torque testing device 7 includes a mounting plate 73, and a plurality of U-shaped mounting holes distributed in a matrix are provided at the end edge of the mounting plate 73. The mounting plate 73 is locked on the connecting frame 10 by pins passing through the U-shaped mounting holes. A mounting seat 72 is connected to the mounting plate 73, and a torque sensor is installed on the mounting seat 72. The torque sensor is a JL7300-400CA non-contact disc torque sensor. A spline flange 8 and a flat key flange 9 are respectively installed at both ends of the torque sensor. The spline end of the spline flange 8 is inserted into the input end of the forklift box bridge assembly 2, and the flat key end of the flat key flange 9 is connected to the output shaft of the drive motor 4, as shown in FIG. Figure 3 As shown, the torque sensor includes a stator 71 fixed on a mounting seat 72, a rotor 74 is rotatably connected inside the stator 71, a strain gauge is installed inside the stator 71, an induction ring is installed inside the rotor 74, and a signal line 77 for receiving a voltage signal of the torque sensor is connected to the mounting seat 72. When the stator 71 transmits torque, the strain gauge will change the voltage signal of the torque sensor through the change of stress and transmit it to an external receiving device through the signal line 77, so that the torque force borne by the rotor 74 can be measured. The two ends of the rotor 74 are respectively connected and fixed to the spline flange 8 and the flat key flange 9, and the middle of the two ends of the rotor 74 are integrally connected with a positioning step 76 extending outward. The rotor 74 is provided with a plurality of threaded holes 75 distributed in an equidistant ring in the circumferential direction of the positioning step 76, and the flange end of the spline flange 8 and the flat key flange 9 is provided with a groove matching and plugging with the corresponding positioning step 76. The flange ends of the spline flange 8 and the flat key flange 9 are connected to the rotor 74 through screws passing through the threaded holes 75.

[0029] like Figure 5 As shown, a connecting frame 10 is connected between the forklift box bridge assembly 2 and the drive motor 4, one end of the connecting frame 10 is connected to a box bridge assembly positioning step 11 inserted on the side wall of the forklift box bridge assembly 2, and the other end of the connecting frame 10 is connected to a limit ring 12 whose one side is connected to the side wall of the drive motor 4, and there is a certain coaxiality requirement between the two, so that the rotational coaxiality between the drive motor 4 and the forklift box bridge assembly 2 can be guaranteed, the mounting plate 73 is detachably connected to the connecting frame 10, the connection between the end of the forklift box bridge assembly 2 and the connecting frame 10 is padded with an oil sealing paper pad 13, a skeleton oil seal 14 is arranged between the box bridge assembly positioning step 11 and the spline flange 8, which can ensure that the gear oil in the forklift box bridge assembly 2 does not leak, a screw hole is opened on the bottom plate of the output shaft of the drive motor 4, and the flat key flange 9 is screwed into the screw hole through the locking bolt 15 to be fixedly connected to the output shaft of the drive motor 4.

[0030] When the torque is collected normally, the output shaft of the driving motor 4 rotates, and the output shaft drives the flat key flange 9 to rotate. Since the flat key flange 9 is connected to the rotor 74, and the rotor 74 is connected to the spline flange 8, the torque will be transmitted to the forklift box bridge assembly 2. The rotor 74 transmits torque while rotating, and the stator 71 of the torque sensor will receive the signal and detect and output the torque value through the signal line after processing. The electric forklift drive motor torque implementation test device has the characteristics of ingenious structure, low cost, high consistency of collected data with the actual situation of the whole vehicle, and the detection equipment can be reused.

[0031] The above embodiments are merely illustrative of the principles and effects of this patent application, and are not intended to limit this patent application. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of this patent application. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the relevant technical field without departing from the spirit and technical ideas disclosed in this patent application should still be covered by the claims of this patent application.

Claims

1. A real-time test device for torque of a driving motor of an electric forklift, comprising a frame (6), a forklift box bridge assembly (2) fixed to the frame (6) through a bridge housing (1) and a second connecting bolt (5), and a driving motor (4) is also connected to the frame (6) through a first connecting bolt (3), characterized in that: The frame (6) is provided with a torque testing device (7) in the gap between the forklift box bridge assembly (2) and the drive motor (4); the torque testing device (7) comprises a mounting plate (73), the mounting plate (73) is connected to a mounting seat (72), a torque sensor is mounted on the mounting seat (72), a spline flange (8) and a flat key flange (9) are mounted at both ends of the torque sensor, the spline end of the spline flange (8) is inserted into the input end of the forklift box bridge assembly (2), and the flat key end of the flat key flange (9) is connected to the output shaft of the drive motor (4); the torque sensor comprises a mounting plate (73) connected to the mounting plate (73), a mounting seat (72) is mounted on the mounting seat (72), and a spline flange (8) and a flat key flange (9) are mounted at both ends of the torque sensor. The stator (71) on the mounting seat (72) is rotatably connected to a rotor (74) in the stator (71), and the two ends of the rotor (74) are respectively connected and fixed to a spline flange (8) and a parallel key flange (9); a connecting frame (10) is connected between the forklift box bridge assembly (2) and the drive motor (4), one end of the connecting frame (10) is connected to a box bridge assembly positioning step (11) inserted on the side wall of the forklift box bridge assembly (2), and the other end of the connecting frame (10) is connected to a limiting ring (12) whose one side is connected to the side wall of the drive motor (4); and the mounting plate (73) is detachably connected to the connecting frame (10).

2. The electric forklift driving motor torque real-time testing device according to claim 1 is characterized in that: The rotor (74) is integrally connected with a positioning step (76) extending outward in the middle of both ends. The rotor (74) is provided with a plurality of threaded holes (75) equidistantly distributed in an annular pattern in the circumferential direction of the positioning step (76). The flange ends of the spline flange (8) and the flat key flange (9) are provided with grooves matching and plugging with the corresponding positioning steps (76). The flange ends of the spline flange (8) and the flat key flange (9) are connected to the rotor (74) by screws passing through the threaded holes (75).

3. The electric forklift driving motor torque real-time testing device according to claim 1 is characterized in that: The mounting seat (72) is connected to a signal line (77) for receiving a voltage signal from a torque sensor.

4. The electric forklift driving motor torque real-time testing device according to claim 1 is characterized in that: The end edge of the mounting plate (73) is provided with a plurality of U-shaped mounting holes distributed in a matrix, and the mounting plate (73) is locked on the connecting frame (10) by means of pins passing through the U-shaped mounting holes.

5. The electric forklift driving motor torque real-time testing device according to claim 1 is characterized by: The connection between the end of the forklift box bridge assembly (2) and the connecting frame (10) is padded with an oil-sealing paper pad (13), and a skeleton oil seal (14) is arranged between the box bridge assembly positioning step (11) and the spline flange (8).

6. The electric forklift driving motor torque real-time testing device according to claim 1, characterized in that: A screw hole is provided on the bottom plate of the output shaft of the driving motor (4), and the flat key flange (9) is screwed into the screw hole through a locking bolt (15) passing through the flat key flange (9) to be fixedly connected to the output shaft of the driving motor (4).

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