Automatic measuring device for chord length of automobile plate spring

Abstract

The utility model relates to automobile plate spring production equipment in the industrial field, in particular to an automatic chord length measuring device for an automobile plate spring, which comprises a main machine and an automatic chord length measuring component. The chord length automatic measuring assembly comprises two zero returning contact plates, two material blocking plates, two pull rope encoders and two fixing plates. The two trolleys can move along the sliding rails and are connected with the two ends of the automobile plate spring correspondingly. The pressing head is located above the sliding rail. The zero returning contact plate is fixedly connected with the trolley, the material blocking plate is fixedly connected with the sliding rail, and the pull rope encoder is fixedly connected with the material blocking plate. One end of a pull rope of the pull rope encoder is fixedly connected with the zero returning contact plate, and the pull rope encoder can read data of the extension length of the pull rope and transmit the data to the control display cabinet. The device for automatically measuring the chord length of the automobile plate spring is simple in structure, low in manufacturing cost, accurate in measured data and high in efficiency.

Description

Technical Field

[0001] The utility model relates to automobile leaf spring production equipment in the industrial field, in particular to an automatic chord length measuring device for an automobile leaf spring. Background Art

[0002] With the development of the automobile industry, the requirements for the performance of automobile parts are getting higher and higher. As one of the automobile parts, the performance of automobile leaf springs plays a vital role in the assembly and comfort of the car.

[0003] In the actual assembly of automobiles, there is a problem that the rear axle thrust angle is unqualified due to the large difference in the chord length of the front-end automobile leaf spring, which affects the assembly and performance of the automobile. To solve this problem, automobile OEMs require the measurement and sorting of the unloaded chord length of automobile leaf springs to ensure that the automobile leaf springs are well assembled.

[0004] Traditional chord length measurement often uses a steel ruler and auxiliary inspection tools to measure manually, which is labor-intensive and inefficient, and the measurement data is greatly affected by human factors. Therefore, it is urgent to design a chord length measuring device for automobile leaf springs that can realize automatic chord length measurement. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, the utility model provides an automatic measuring device for the chord length of an automobile leaf spring, which has a simple structure, low manufacturing cost and good use effect.

[0006] An automatic chord length measuring device for a leaf spring of an automobile comprises a main machine and an automatic chord length measuring component, wherein the main machine comprises a slide rail, two trolleys, an oil cylinder, a pressure head, and a control display cabinet; the automatic chord length measuring component comprises two return-to-zero contact plates, two baffle plates, two pull-wire encoders, and two fixing plates;

[0007] The two trolleys are movably connected to the slide rails, wherein pulleys are provided at the bottom of the two trolleys, the pulleys match the slide rails in size, the trolleys can move along the slide rails, and fixed brackets are provided on the tops of the trolleys for connecting with both ends of the automobile leaf springs;

[0008] The oil cylinder has its own power drive device. The cylinder barrel of the oil cylinder is arranged vertically. The piston rod of the oil cylinder can move up and down along the cylinder barrel. The pressure head is fixedly connected to the bottom end of the piston rod of the oil cylinder, and the pressure head and the piston rod of the oil cylinder are located in the middle position above the slide rail.

[0009] The control display cabinet is fixed on the side of the cylinder and is used to receive and display the readings of the rope encoder;

[0010] The zero return contact plate is fixedly connected to the outer side surface of the trolley;

[0011] The material blocking plate is fixedly connected to the outer side surface of the slide rail, and the height of the material blocking plate is higher than the height of the trolley;

[0012] The pull-wire encoder is fixedly connected to the outer side surface of the material baffle plate, and one end of the pull wire of the pull-wire encoder is fixedly connected to the center position of the zero return contact plate; and the pull-wire encoder is connected to the control display cabinet through a signal line, and the pull-wire encoder can automatically identify and read the extension length data of the pull wire and transmit the data to the control display cabinet; the fixed plate is fixedly connected to the inner side surface of the material baffle plate, and the fixed plate can contact the zero return contact plate.

[0013] Furthermore, the bottom surface of the pressure head is arranged in an arc shape, an inverted V shape or an inverted U shape, so as to match the shape of the automobile leaf spring and to facilitate force bearing.

[0014] Furthermore, the upper end of the baffle plate is tilted, and the tilt angle is 45°~55° with the horizontal plane.

[0015] When no initial measurement is performed and the leaf spring is not assembled, the zero return contact plate on the outer side of the trolley is close to the fixed plate on the inner side of one end of the baffle plate, and this is used as the basis for chord length measurement.

[0016] With this reference as the zero point, the automobile leaf spring is placed on the trolley, and the main engine cylinder drives the pressure head downward. The pressure head presses the automobile leaf spring to deform it, so that the trolley moves left and right on the slide rail, driving the rope on the rope encoder to extend and retract. The reading of the rope encoder increases or decreases with the movement of the trolley and is displayed on the control display cabinet, thereby realizing automatic measurement of the chord length and recording of data.

[0017] In actual use, the size and installation method of the chord length automatic measuring device can be adjusted according to the structure and form of the main machine. The production is simple and the installation is convenient.

[0018] Beneficial effects:

[0019] The automatic measuring device for the chord length of an automobile leaf spring provided by the utility model can realize automatic measurement of the chord length with high efficiency and accurate data; the measuring method is simple and convenient, the measuring time is short, and the automatic reading and display of the measured data can be realized, which is beneficial to improving the efficiency of the measuring work; it can reduce the labor intensity of employees, and improve production efficiency and employee satisfaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the automatic measuring device for the chord length of a leaf spring of an automobile in an embodiment of the utility model;

[0021] Figure 2 It is a structural schematic diagram of a zero return contact plate of an automatic measuring device for chord length of a leaf spring for an automobile in an embodiment of the utility model;

[0022] Figure 3 It is a structural schematic diagram of a fixing plate of an automatic measuring device for chord length of a leaf spring for an automobile in an embodiment of the utility model;

[0023] Figure 4 It is a structural schematic diagram of a material baffle plate of an automatic measuring device for chord length of an automobile leaf spring in an embodiment of the utility model.

[0024] In the figure: 1-zero return contact plate, 2-material stop plate, 3-pull rope encoder, 4-fixed plate, 5-slide rail, 6-trolley, 7-oil cylinder, 8-pressure head, 9-control display cabinet, 10-automobile leaf spring. DETAILED DESCRIPTION

[0025] Example

[0026] like Figure 1~Figure 4 The automatic chord length measuring device for an automobile leaf spring shown in the figure includes a main machine and an automatic chord length measuring component. The main machine includes a slide rail 5, two trolleys 6, a cylinder 7, a pressure head 8, and a control display cabinet 9; the automatic chord length measuring component includes two symmetrically arranged zero return contact plates 1, two material stop plates 2, two pull rope encoders 3, and two fixed plates 4.

[0027] Two sets of pulleys are provided at the bottom of the two trolleys 6. The pulleys match the size of the slide rails 5. The trolleys 6 can move along the slide rails 5. A fixed bracket is provided on the top of the trolley 6. The fixed bracket can be detachably connected to the two ends of the automobile leaf spring 10 by bolts.

[0028] The oil cylinder 7 has its own power drive device. The cylinder barrel of the oil cylinder 7 is arranged vertically and fixed on the ground through a base. The piston rod of the oil cylinder 7 can move up and down along the cylinder barrel. The pressure head 8 is fixedly connected to the bottom end of the piston rod of the oil cylinder 7, and the pressure head 8 and the piston rod of the oil cylinder 7 are located in the middle position above the slide rail 5.

[0029] like Figure 1 As shown, the bottom surface of the pressure head 8 is arranged in an arc shape or an inverted V shape or an inverted U shape, which is convenient for matching the shape of the automobile leaf spring 10 and for bearing force. After the pressure head 8 moves downward, it can touch and press the automobile leaf spring 10;

[0030] The control display cabinet 9 is fixed on the side of the base of the oil cylinder 7 and is used to receive and display the reading of the rope encoder 3.

[0031] The return-to-zero contact plate 1 is fixedly connected to the outer side of the trolley 6. The structure of the return-to-zero contact plate 1 is as follows: Figure 2 As shown;

[0032] The two baffle plates 2 are respectively fixedly connected to the outer side surfaces of both ends of the slide rail 5, and the baffle plates 2 are arranged vertically, and the height of the baffle plates 2 is higher than the height of the trolley 6; the upper end of the baffle plate 2 is inclined, and the inclination angle is 45° to 55° with the horizontal plane, which is used to prevent the automobile leaf spring 10 from accidentally breaking and popping out to hurt people. The structure of the baffle plate 2 is as follows Figure 4 shown.

[0033] The draw rope encoder 3 is fixedly connected to the outer side surface of the baffle plate 2, and one end of the draw rope of the draw rope encoder 3 is fixedly connected to the center position of the return-to-zero contact plate 1. In this embodiment, the baffle plate 2 and the fixed plate 4 are provided with through holes at positions corresponding to the draw rope, and the draw rope passes through the baffle plate 2 and the fixed plate 4 and is fixedly connected to the return-to-zero contact plate 1, and the draw rope encoder 3 and the return-to-zero contact plate 1 are located at the same height, so that the draw rope of the draw rope encoder 3 always maintains a horizontal extension / contraction state; the draw rope encoder 3 belongs to a draw rope displacement sensor, which is a linear displacement sensor used to detect the displacement of the trolley 6 connected to the draw rope. The measuring stroke of the draw rope encoder used in this embodiment is 0~2000 mm (i.e. within 2 meters); the draw rope encoder 3 is connected to the control display cabinet 9 through a signal line, and the draw rope encoder 3 can automatically identify and read the extension length data of the draw rope, and transmit the data to the control display cabinet 9; the draw rope encoder 3 and the control display cabinet 9 are powered by an external power supply. In this embodiment, the model of the draw rope encoder 3 is KS50-2000-02-F, and the model of the control display cabinet 9 is GGD. The fixing plate 4 is fixedly connected to the inner side of the baffle plate 2. The structure of the fixing plate 4 is as follows: Figure 3 shown.

[0034] Reference Figure 1 When the automatic measuring device for the chord length of a leaf spring of an automobile of the utility model is used, the return-to-zero contact plate 1 on the outer side of one end of the trolley 6 is firstly placed close to the fixed plate 4 on the inner side of one end of the baffle plate 2, and this position is used as a reference for measuring the chord length. Then take this reference as the zero point (that is, when the return to zero contact plate 1 is close to the material blocking plate 2, the stretch of the draw rope encoder 3 is at the zero point value and no reading is generated), place the automobile leaf spring 10 on the trolley 6, and after the automobile leaf spring 10 is fixed, the draw rope of the draw rope encoder 3 is in an extended state. At this time, a reading of the draw rope encoder 3 can be obtained, and then the main engine cylinder 7 drives the pressure head 8 downward, and the pressure head 8 presses down and applies a set force to deform the automobile leaf spring 10. During this process, the two trolleys 6 will move a certain distance left / right on the slide rail 5, and the trolley 6 drives the return to zero contact plate 1 to move, thereby driving the draw rope on the draw rope encoder 3 to retract and retract. The reading of the draw rope encoder 3 increases or decreases with the movement of the trolley 6 (that is, the change in the amount of extension and retraction of the draw rope), and is displayed on the control display cabinet 9, thereby realizing the automatic measurement of the chord length of the automobile leaf spring 10 and recording the data.

[0035] Among them, the principle of measuring the chord length of the automobile leaf spring is to deform the automobile leaf spring, measure the change in the extension length of the pull rope, and convert it into the chord length distance. This conversion method is a conversion calculation method known in the prior art. Other parameters involved in the conversion process are parameters that have been obtained before this chord length detection process. The parameters that need to be obtained in this chord length detection process are the automobile leaf spring deformation data measured by the automobile leaf spring chord length automatic measuring device of the utility model. The conversion calculation formula is programmed into the control chip of the control display cabinet 9 through the PLC programming function, so that it can automatically calculate the conversion method. This is a function of the control display cabinet 9, which belongs to the prior art. This calculation conversion method is not within the scope of protection of this application.

[0036] The preferred embodiments of the present invention are described in detail in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. An automatic measuring device for the chord length of a leaf spring of an automobile, characterized in that: It comprises a main machine and an automatic chord length measuring component, wherein the main machine comprises a slide rail (5), two trolleys (6), a cylinder (7), a pressure head (8), and a control display cabinet (9), and the automatic chord length measuring component comprises two return-to-zero contact plates (1), two material blocking plates (2), two pull-wire encoders (3), and two fixing plates (4); Two trolleys (6) are movably connected to the slide rail (5), and the trolleys (6) can move along the slide rail (5). A fixed bracket is provided on the top of the trolley (6) for connecting with two ends of the automobile leaf spring (10); the cylinder barrel of the oil cylinder (7) is arranged vertically, and the piston rod of the oil cylinder (7) can move up and down along the cylinder barrel; the pressure head (8) is fixedly connected to the bottom end of the piston rod of the oil cylinder (7), and the pressure head (8) and the piston rod of the oil cylinder (7) are located in the middle position above the slide rail (5); the control display cabinet (9) is fixed on the side of the oil cylinder (7); The zero return contact plate (1) is fixedly connected to the outer side surface of the trolley (6), the material blocking plate (2) is fixedly connected to the outer side surface of the slide rail (5), and the rope encoder (3) is fixedly connected to the material blocking plate (2); one end of the rope of the rope encoder (3) is fixedly connected to the center position of the zero return contact plate (1), and the rope encoder (3) is connected to the control display cabinet (9) via a signal line. The rope encoder (3) can read the extension length data of the rope and transmit the data to the control display cabinet (9); the fixed plate (4) is fixedly connected to the inner side surface of the material blocking plate (2).

2. The automatic measuring device for the chord length of a leaf spring for an automobile according to claim 1, characterized in that: The bottom surface of the pressure head (8) is arranged in an arc shape, an inverted V shape, or an inverted U shape.

3. The automatic measuring device for the chord length of a leaf spring for an automobile according to claim 1, characterized in that: The height of the material blocking plate (2) is higher than the height of the trolley (6).

4. The automatic measuring device for the chord length of a leaf spring for an automobile according to claim 3, characterized in that: The upper end of the baffle plate (2) is arranged to be inclined, and the inclination angle is 45° to 55° with the horizontal plane.

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