DC electric rivet gun power automatic adjustment system and method

Abstract

The present invention relates to a direct current electric rivet gun power automatic adjustment system and method, which performs tension detection on the riveting process of the rivet gun by arranging a tension detection device on a connecting tube or a pressing tube, thereby changing the output power of the motor in a targeted manner according to the change of the tension in the riveting process, so that the output power of the motor is adapted to rivets of different models and different tensile strengths, thereby avoiding the technical problem of wasting electric energy when drawing small rivets with high power, extending the battery life of the rivet gun, and not causing the technical problems of increased complexity in the operation of the rivet gun and decreased user experience.

Description

Technical Field

[0001] The invention belongs to the technical field of riveting devices, and in particular relates to a direct current electric rivet gun power automatic adjustment system and method. Background Art

[0002] DC electric rivet guns are highly favored by users in the field of riveting devices due to their advantages of high power and high pulling force. With the rapid development of lithium battery technology, in order to obtain more convenient use effects, DC electric rivet guns powered by lithium batteries will become a development trend. However, the high-power working state reduces the battery life of DC electric rivet guns. In order to extend the battery life, the technical means commonly used by technicians in this field is to classify the working modes of rivet guns, and divide them into multiple gears according to the output power. Users can choose different output gears according to the different specifications of rivets to save energy and extend the battery life. However, this method not only increases the cost of the rivet gun control switch, but also makes the operation of the rivet gun more complicated. It takes a long time of user teaching process to make users familiar with the best operation method to obtain the best battery life extension effect. Summary of the invention

[0003] The first technical problem to be solved by the present invention is to provide an automatic power adjustment system for a DC electric rivet gun to solve the technical problems of increased operation complexity and decreased user experience caused by extending the battery life of the rivet gun.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a DC electric rivet gun power automatic adjustment system, characterized in that it includes a controller, a tension detection device electrically connected to the controller, a control switch, a power supply for supplying power to the controller, the tension detection device, and the motor, a main switch for controlling the on and off of the power supply, and an input device for sending a start command to the controller, the power supply is connected to the motor through the controller and is electrically connected to the controller through a voltage management module; one end of the input device is electrically connected to the controller, and the other end is connected to the power supply, the tension detection device includes at least one patch type strain gauge extending along the axial direction of the screw rod of the electric rivet gun, the two ends of the patch type strain gauge are respectively connected to the power supply and the controller, and the patch type strain gauge is fixedly connected to the outer wall of the connecting tube or the outer wall of the pressing tube inside the electric rivet gun.

[0005] As a preferred solution, the tension detection device includes a plurality of patch type strain gauges, and the plurality of patch type strain gauges are evenly distributed circumferentially on the outer wall of the connecting tube or the outer wall of the pressing tube inside the electric rivet gun.

[0006] As a preferred solution, the control switch is a MOS tube.

[0007] A further technical problem to be solved by the present invention is to provide a method for automatically adjusting the power of a DC electric rivet gun to solve the technical problems of increased operation complexity and decreased user experience caused by extending the battery life of the rivet gun.

[0008] In order to solve the above technical problems, the technical solution adopted by the present invention is: a DC electric rivet gun power automatic adjustment method based on the above DC electric rivet gun power automatic adjustment system comprises the following specific steps:

[0009] 1) Close the main switch, turn on the power of the DC electric rivet gun, and power the controller and tension detection device.

[0010] 2) Send a start command to the controller through the input device. After receiving the command, the controller turns on the control switch according to the preset program to control the motor to work at the initial output power; at the same time, the tension detection device detects the tension of the connecting pipe or the compression pipe, and sends the detection result to the controller.

[0011] 3) When the tension detected by the tension detection device received by the controller does not reach the first-level tension preset value within 1s, it is determined that no rivet is set on the gun head. At this time, the controller directly controls the motor to stop and control the motor to reverse and reset; when the tension detected by the tension detection device received by the controller reaches the first-level tension preset value within 1s, the controller increases the output power of the motor to the second-level output power; when the tension received by the controller continues to increase to the second-level tension preset value, the controller increases the output power of the motor to the third-level output power, and when the tension received by the controller continues to increase to the N-level tension preset value, the controller increases the output power of the motor to the N+1-level output power, where N is an integer greater than two, until the tension received by the controller decreases. The controller adjusts the output power of the motor to the output power level corresponding to the tension preset value of the level below which the tension drops. When the tension detected by the controller decreases to below the first-level tension preset value, the controller determines that the rivet on the gun head is broken, and the controller directly controls the motor to stop and control the motor to reverse and reset.

[0012] As a preferred solution, when implementing step 3), when the controller determines that the rivet on the gun head is broken, the controller delays for 0.1 seconds to control the motor to stop and controls the motor to reverse and reset.

[0013] The beneficial effect of the present invention is as follows: the present invention performs tension detection on the riveting process of the rivet gun by arranging a tension detection device on the connecting tube or the pressing tube, thereby changing the output power of the motor in a targeted manner according to the change of the tension in the riveting process, so that the output power of the motor is adapted to rivets of different models and different tensile strengths, thereby avoiding the technical problem of wasting electric energy by using high power to pull small rivets, extending the battery life of the rivet gun, and not causing the technical problems of increased complexity in the operation of the rivet gun and decreased user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings, wherein:

[0015] Figure 1 It is a structural schematic diagram of the utility model;

[0016] Figure 2 It is the electrical schematic diagram of the utility model;

[0017] Figure 1 and Figure 2 In: 1. controller, 2. tension detection device, 2a. patch strain gauge, 3. control switch, 4. motor, 5. power supply, 6. main switch, 7. input device, 8. voltage management module, 9. screw, 10. connecting tube, 11. pressing tube. DETAILED DESCRIPTION

[0018] The specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0019] like Figure 1 and Figure 2 The DC electric rivet gun power automatic adjustment system shown includes a controller 1, a tension detection device 2 electrically connected to the controller 1, a control switch 3, a power supply 5 for supplying power to the controller 1, the tension detection device 2, and the motor 4, a main switch 6 for controlling the on and off of the power supply 5, and an input device 7 for sending a start command to the controller 1. The power supply 5 is connected to the motor 4 through the control switch 3. The power supply 5 is also electrically connected to the controller 1 through a voltage management module 8. The voltage management module 8 is a conventional voltage regulation chip available on the market, so its specific structure is not described in this application. One end of the input device 7 is electrically connected to the controller 1, and the other end is connected to the power supply 5. The input device 7 in this embodiment is a mechanical button switch, which can be replaced by a touch screen in actual applications. The tension detection device 2 includes two patch-type strain gauges 2a extending axially along the screw rod 9 of the electric rivet gun, and the two patch-type strain gauges 2a are symmetrically distributed on the outer wall of the connecting tube 10 or the outer wall of the pressing tube 11 inside the electric rivet gun. The specific structure of the DC electric rivet gun can refer to the utility model patent with patent number ZL 2014207068161 and the name of "a travel control system for a handheld electric rivet gun".

[0020] The two ends of any patch type strain gauge 2a are respectively connected to the power supply 5 and the controller 1, and the detection signals are respectively sent to the controller 1. The controller calculates the tension values ​​of the two signals and averages them to improve the detection accuracy. The patch type strain gauge 2a is fixedly connected to the outer wall of the connecting tube 10 or the outer wall of the pressing tube 11 inside the electric rivet gun, and is preferably arranged on the outer wall of the pressing tube 11. When the pressing tube 11 is pulled by the screw 9 and the internal clamping claws of the pressing tube 11 clamp the anchor rod, it will receive a radial outward reaction force. This reaction force will force the front end of the pressing tube 11 to expand outward, so that the patch type strain gauge 2a produces a composite deformation of bending and stretching, so that the results detected by the tension detection device vary in a wider range, so as to improve the control accuracy of the controller 1 in performing corresponding control according to the detection results.

[0021] The control switch 3 described in this embodiment is a MOS tube, and the MOS tube is controlled by the controller 1. The controller 1 controls the output power of the motor by controlling the output PWM duty cycle.

[0022] Combination Figure 1 and Figure 2 The DC electric rivet gun power automatic adjustment method based on the DC electric rivet gun power automatic adjustment system comprises the following specific steps:

[0023] 1) Close the main switch 6, connect the DC electric rivet gun power supply 5, and power the controller 1 and the tension detection device 2.

[0024] 2) A start command is sent to the controller 1 through the input device 7. After receiving the command, the controller 1 turns on the control switch 3 to control the motor 4 to work at the initial output power. At the same time, the tension detection device detects the tension on the connecting tube 10 or the compression tube 11, and sends the detection result to the controller 1. In this embodiment, when the input device 7 is disconnected, the terminal of the controller 1 connected to the input device 7 is at a low level. After the input device 7 is closed, the controller obtains a high level, which is the start command.

[0025] 3) When the tension detected by the tension detection device 2 received by the controller 1 does not reach the first-level tension preset value within 1s, it is determined that no rivet is set on the gun head. At this time, the controller 1 directly controls the motor 4 to stop and then controls the motor 4 to reverse and reset; when the tension detected by the tension detection device 2 received by the controller 1 reaches the first-level tension preset value within 1s, the controller 1 increases the output power of the motor 4 to the second-level output power; when the tension received by the controller 1 continues to increase to the second-level tension preset value, the controller increases the output power of the motor 4 to the third-level output power. 1 continues to increase to the preset value of the tension of level N, the controller increases the output power of motor 4 to the output power of level N+1, where N is an integer greater than two, until the tension received by controller 1 decreases. Then, according to the preset value of the tension below which the tension drops, controller 1 adjusts the output power of motor 4 to the output power level corresponding to the preset value of the tension. For example, when the tension received by controller 1 drops below the preset value of the second-level tension, it is equivalent to the tension exceeding the preset value of the first-level tension. At this time, the controller adjusts the output power of motor 4 to the second-level output power. When the tension detected by controller 1 drops below the preset value of the first-level tension, controller 1 determines that the gun head rivet is broken. At this time, controller 1 directly controls motor 4 to stop and then controls motor 4 to reverse and reset.

[0026] Preferably, when implementing step 3), when the controller 1 determines that the gun head rivet is broken, the controller 1 delays 0.1 seconds to control the motor 4 to stop and then controls the motor 4 to reverse and reset, so as to ensure that the rivet pull rod is broken.

[0027] The present invention performs tension detection on the riveting process of the rivet gun by arranging a tension detection device 2 on the connecting tube 10 or the pressing tube 11, thereby changing the output power of the motor 4 in a targeted manner according to the change of the tension in the riveting process, so that the output power of the motor 4 is adapted to rivets of different models and different tensile strengths, thereby avoiding the technical problem of wasting electric energy when using high power to pull small rivets, extending the battery life of the rivet gun, and not causing the technical problems of increased complexity in the operation of the rivet gun and decreased user experience.

[0028] The above embodiments are only illustrative of the principles and effects of the invention, as well as some embodiments of its application, and are not intended to limit the invention. It should be pointed out that a person skilled in the art can make several modifications and improvements without departing from the inventive concept of the invention, and all of these belong to the protection scope of the invention.

Claims

1. A method for automatically adjusting the power of a DC electric rivet gun, characterized in that: The invention comprises an automatic power regulation system, the automatic power regulation system comprising a controller (1), a tension detection device (2) electrically connected to the controller (1), a control switch (3), a power supply (5) for supplying power to the controller (1), the tension detection device (2), and a motor (4), a main switch (6) for controlling the on and off of the power supply (5), and an input device (7) for sending a start instruction to the controller (1), wherein the power supply (5) is connected to the motor (4) through the control switch (3) and is electrically connected to the controller (1) through a voltage management module (8); one end of the input device (7) is electrically connected to the controller (1) and the other end is connected to the power supply (5); the tension detection device (2) comprises at least one patch type strain gauge (2a) extending along the axial direction of a screw rod (9) of an electric rivet gun, the two ends of the patch type strain gauge (2a) are respectively connected to the power supply (5) and the controller (1), and the patch type strain gauge (2a) is fixedly connected to the outer wall of a connecting tube (10) or the outer wall of a pressing tube (11) inside the electric rivet gun; The power automatic adjustment method comprises the following specific steps: 1) Close the main switch, connect the DC electric rivet gun power supply, and power the controller and tension detection device; 2) Send a start command to the controller through the input device. After receiving the command, the controller turns on the control switch according to the preset program to control the motor to work at the initial output power. At the same time, the tension detection device detects the tension of the connecting pipe or the compression pipe, and sends the detection result to the controller; 3) When the tension detected by the tension detection device received by the controller does not reach the first-level tension preset value within 1s, it is determined that no rivet is set on the gun head. At this time, the controller directly controls the motor to stop and control the motor to reverse and reset; when the tension detected by the tension detection device received by the controller reaches the first-level tension preset value within 1s, the controller increases the output power of the motor to the second-level output power; when the tension received by the controller continues to increase to the second-level tension preset value, the controller increases the output power of the motor to the third-level output power, and when the tension received by the controller continues to increase to the N-level tension preset value, the controller increases the output power of the motor to the N+1-level output power, where N is an integer greater than two, until the tension received by the controller decreases. The controller adjusts the output power of the motor to the output power level corresponding to the tension preset value of the level below which the tension drops. When the tension detected by the controller decreases to below the first-level tension preset value, the controller determines that the rivet on the gun head is broken, and the controller directly controls the motor to stop and control the motor to reverse and reset.

2. The method for automatically adjusting the power of a DC electric rivet gun according to claim 1, characterized in that: When implementing step 3), when the controller determines that the rivet on the gun head is broken, the controller delays 0.1 seconds to control the motor to stop and controls the motor to reverse and reset.

3. The method for automatically adjusting the power of a DC electric rivet gun according to claim 1, characterized in that: The tension detection device (2) comprises a plurality of patch-type strain gauges (2a), and the plurality of patch-type strain gauges (2a) are evenly distributed in the circumferential direction on the outer wall of a connecting tube (10) or an outer wall of a pressing tube (11) inside the electric rivet gun.

4. The method for automatically adjusting the power of a DC electric rivet gun according to claim 1, characterized in that: The control switch (3) is a MOS tube.

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