Adaptive temperature protection control method for fastener striking tool

Abstract

The invention discloses a self-adaptive temperature protection control method for a fastener striking tool, and the method comprises the following steps: starting the fastener striking tool, and counting the total time length ti of continuous i times of nailing operation after starting through a timing module; dynamically adjusting the protection temperature threshold value Te of the power element according to the total time length ti of continuous i times of nailing; when the accumulated nailing times i exceed a preset threshold value n or the total duration ti exceeds tmax, i is reset, and the total duration ti of continuous i times of nailing is counted again in a sliding time window mode; the temperature of the power element is collected in real time through the temperature sensor, if the temperature exceeds the currently set protection temperature threshold Te, the controller triggers over-temperature protection, and if the temperature does not exceed the currently set temperature threshold Te, the fastener striking tool operates normally. Temperature protection parameters can be automatically adjusted according to the actual working state of the fastener striking tool, the equipment safety is guaranteed, and the working efficiency is improved.

Description

Technical Field

[0001] The present invention relates to an adaptive temperature protection control method for a fastener striking tool, belonging to the technical field of power tools. Background Art

[0002] Fastener striking tools such as nail shooting tools are widely used in industries such as construction and decoration. Their working principle relies on the movement of a piston inside a cylinder driven by compressed air to push a firing pin to drive nails quickly and firmly into a workpiece. However, during long-term continuous operation, the internal components of a nail shooting tool, such as the motor and components on the control board, may experience temperature rise due to heat generation, possibly exceeding their respective safe operating temperature ranges. For example, the temperature rise of the motor coil may exceed the heat resistance level of the insulating paint, and the temperatures of MOSFET components and capacitors on the control board may also exceed their tolerance limits, thus causing equipment failures.

[0003] Actual tests show that the nail shooting speed has a direct impact on the equipment temperature and its performance. As Figure 1 , Figure 2 , Figure 3 and shown in the following table:

[0004] When performing nail driving operations at a slower speed, even when the motor reaches its maximum safe operating temperature, the temperature sensed by the NTC (negative temperature coefficient) thermistor is relatively low, allowing for more nail driving times. Conversely, as the nail shooting speed increases, when the motor reaches its temperature limit, the temperature recorded by the NTC is higher, and the corresponding allowed nail driving times decrease.

[0005] Traditional designs usually adopt a fixed MOSFET protection temperature threshold. However, for a nail shooting tool, if this threshold is set too low, the potential in the fast nail shooting mode cannot be fully utilized; if set too high, the motor may be damaged under low-speed but long-term operating conditions. Summary of the Invention

[0006] The purpose of the present invention is to overcome the problems existing in the prior art and propose an adaptive temperature protection control method for a fastener striking tool, which can automatically adjust temperature protection parameters according to the actual working state of the nail shooting tool, ensuring both equipment safety and improving work efficiency.

[0007] To solve the above technical problems, an adaptive temperature protection control method for a fastener striking tool of the present invention, the fastener striking tool includes a housing, and inside the housing are provided an energy storage mechanism, a nail driving mechanism, a lifting mechanism and a controller. The controller includes a timing module and a power element, and a temperature sensor is also provided inside the housing; The process includes the following steps: (1) starting the fastener striking tool, (2) The total duration ti of consecutive i nailing operations after the machine is turned on is counted through the timing module; (3) dynamically adjusting the protection temperature threshold Te of the power element according to the total duration ti of the i consecutive nailing times; (4) When the cumulative number of nailing times i exceeds the preset threshold n or the total duration ti exceeds tmax, i is reset to zero, and the total duration ti of consecutive i nailing times is recalculated in a sliding time window manner; (5) The temperature of the power element is collected in real time through the temperature sensor. If the temperature exceeds the currently set protection temperature threshold Te, the controller triggers the over-temperature protection. If the temperature does not exceed the currently set temperature threshold Te, the fastener striking tool operates normally.

[0008] Furthermore, the adjustment rule of the protection temperature threshold Te in step (2) is: When the total time ti ≥ time1, the protection temperature threshold is set to Te1; When the total duration time1 > ti ≥ time2, the protection temperature threshold is set to Te2; When the total duration time2 > ti, the protection temperature threshold is set to Te3; Among them, time2 < time1, and Te1 < Te2 < Te3.

[0009] Furthermore, the preset threshold n has a value range of 3≤n≤30, and the value of n is configured by the controller based on the tool model.

[0010] Furthermore, when the preset threshold n is set to 8 times, the value of time1 is 8s, and the value of time2 is 4s.

[0011] Furthermore, the statistical method of the sliding time window is to retain the latest m nailing time records, where m is the window capacity and satisfies m≥n+1.

[0012] Furthermore, the over-temperature protection includes a phased protection strategy: when the temperature exceeds Te, the controller reduces the output current of the power element; if the temperature continues to exceed Te for a preset time, it is forced to shut down and an over-temperature alarm is issued.

[0013] Furthermore, there is also a state condition for releasing the over-temperature protection, that is, the protection state is released when the temperature drops to Te-ΔT, where the value of ΔT is 5°C.

[0014] Furthermore, the value range of tmax is between 10 and 25 seconds.

[0015] Further, the difference between Te1, Te2, and Te3 does not exceed 12 °C, and the value range of Te3 ≥ 80 °C.

[0016] The present invention also provides an adaptive temperature protection control method for a fastener striking tool, including the following steps: (1) The fastener striking tool is started. (2) The work Wi done by the continuous i nail driving operations after startup and the total duration ti of the continuous i nail driving operations are counted through the timing module. (3) The protection temperature threshold Te of the power element is dynamically adjusted according to the total duration ti when Wi reaches the predetermined threshold Wn. (4) When the work Wi done within the time ti reaches the threshold Wn or the total duration ti exceeds tmax, i is cleared and the total work Wi and the total duration ti of the continuous i nail driving are re-counted in the way of a sliding time window. (5) The temperature of the power element is collected in real time through the temperature sensor. If the temperature exceeds the currently set protection temperature threshold Te, the controller triggers over-temperature protection. If the temperature does not exceed the currently set temperature threshold Te, the fastener striking tool operates normally.

[0017] Further, the adjustment rule of the protection temperature threshold Te in step (2) is: When the total duration ti ≥ time1, the protection temperature threshold is set to Te1. When the total duration time1 > ti ≥ time2, the protection temperature threshold is set to Te2. When the total duration time2 > ti, the protection temperature threshold is set to Te3. Among them, time2 < time1, and Te1 < Te2 < Te3 is satisfied.

[0018] Further, the value range of the preset threshold Wn is 200 ≤ Wn ≤ 400, and the n value is configured through the controller based on the tool model.

[0019] Further, when the preset threshold Wn is set to 300 J, the value of time1 is 8 s, and the value of time2 is 4 s.

[0020] Further, the statistical method of the sliding time window is to retain the records of the recent m nail driving times, where m is the window capacity and m ≥ n + 1 is satisfied.

[0021] Further, the over-temperature protection includes a phased protection strategy: when the temperature exceeds Te, the controller reduces the output current of the power element; if the temperature continuously exceeds Te for a preset duration, forced shutdown and over-temperature alarm are issued.

[0022] Furthermore, there is also a state condition for releasing the over-temperature protection, that is, the protection state is released when the temperature drops to Te-ΔT, where the value of ΔT is 5°C.

[0023] Furthermore, the value range of tmax is between 10 and 25 seconds.

[0024] Furthermore, the difference between Te1, Te2 and Te3 does not exceed 12°C, and the value range of Te3 is ≥80°C.

[0025] Compared with the prior art, the present invention has achieved the following beneficial effects: 1. It can give full play to the performance of the machine, increase the number of sustainable nailing and play an effective temperature protection role. Whether it is continuous long-term operation or intermittent fast nailing, the equipment can ensure safe operation by dynamically adjusting the temperature threshold. 2. Avoid equipment failure caused by unreasonable setting of fixed thresholds. Whether it is high-speed short-term operation or low-speed long-term operation, the equipment can maintain stable performance, reduce the number of shutdowns caused by overheating problems, and improve the reliability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The accompanying drawings are only provided for reference and explanation and are not intended to limit the present invention.

[0027] Figure 1 This is a schematic diagram of temperature change at a speed of 1 gun per second; Figure 2 This is a schematic diagram of temperature change at a speed of 2 shots per second; Figure 3 This is a schematic diagram of temperature change at a speed of 3 shots per second; Figure 4 It is a schematic diagram of the structure of the fastener striking tool in the present invention; Figure 5 is a circuit schematic diagram of the controller in the present invention; Figure 6 It is a logic block diagram of a specific embodiment 1 of the present invention; Figure 7 This is a logic block diagram of the second specific embodiment of the present invention.

[0028] 1. Energy storage mechanism, 2. Nailing mechanism, 3. Lifting mechanism, 4. Striking head, 5. Controller, 6. Driving Hall, 7. Striking head Hall. DETAILED DESCRIPTION

[0029] In the following description of the present invention, the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating that the device must have a specific orientation.

[0030] In order to make the technical means, creative features, achieved purposes and effects realized by the present invention easy to understand, the present invention will be further described below with reference to specific illustrations.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0032] As Figure 4 shown, the fastener striking tool includes a housing, and an energy storage mechanism 1, a nail driving mechanism 2, a lifting mechanism 3, a striking head 4 and a controller 5 are provided in the housing. The circuit schematic diagram of the controller 5 is as Figure 5 shown. The controller includes a timing module and a power element, and a temperature sensor is also provided in the housing; the lifting mechanism includes a lifting wheel, a driving Hall 6 is provided on the lifting wheel, and a striking head Hall 7 is provided at the striking head, and nail driving counting is performed through the driving Hall and / or the striking head Hall.

[0033] Specific Embodiment 1: The present invention aims to provide an adaptive temperature protection control method for a fastener striking tool. As Figure 6 shown, it includes the following steps: (1) The fastener striking tool gun is started. (2) The total duration ti of consecutive i nail driving operations after startup is counted through the timing module. (3) The protection temperature threshold Te of the power element is dynamically adjusted according to the total duration ti of consecutive i nail drivings. (4) Taking a 16Ga mosquito nail gun as an example, when the cumulative nail driving times i exceed the preset threshold n = 8 or the total duration ti exceeds Tmax = 20s, i is cleared, and the total duration ti of consecutive i nail drivings is re-counted in a sliding time window manner; the statistical method of the sliding time window is to retain the records of the most recent m nail driving times, where m is the window capacity and satisfies m ≥ n + 1.

[0034] (5) The temperature of the power element is collected in real time through the temperature sensor. If the temperature exceeds the currently set protection temperature threshold Te, the controller triggers over-temperature protection. If the temperature does not exceed the currently set protection temperature threshold Te, the machine operates normally.

[0035] When the duration ti ≥ 8s, the protection temperature threshold Te1 is set to 60℃, when the total duration 4≤ ti <8s, the protection temperature threshold Te2 is set to 70℃, and when the total duration ti<4s, the protection temperature threshold Te3 is set to 80℃, where the difference between Te1, Te2, and Te3 can be arithmetic or unequal, and can be personalized according to different models of tools. Overtemperature protection includes a staged protection strategy: when the temperature exceeds Te, the controller reduces the output current of the power element; if the temperature continues to exceed Te for a preset time, it is forced to shut down and an overtemperature alarm is issued.

[0036] The present invention also includes a state condition for releasing the over-temperature protection, that is, the protection state is released when the temperature drops to Te-ΔT, where the value of ΔT is 5°C. When the temperature exceeds the protection threshold, the controller will gradually reduce the output current of the power element to avoid the inconvenience caused by the instantaneous shutdown of the equipment to the user's operation. At the same time, when the temperature drops to a certain range below the protection threshold (ΔT=5°C), the equipment can automatically release the protection state and resume normal operation, ensuring that the equipment achieves the best balance between safety and efficiency.

[0037] The present invention can reduce the number of shutdowns for maintenance due to temperature problems and improve the reliability of equipment by dynamically adjusting the threshold and combining the statistical method of the sliding time window. Specific embodiments

[0038] The method of realizing segmented temperature protection by counting the accumulated work done within a period of time is also included in the protection scope of the present invention. Since the work done by each nailing is basically the same, but the faster the nailing speed, the higher the nailing power, the present invention also has a second embodiment: The following steps are involved: (1) The fastener striking tool is started, (2) The timing module is used to count the work Wi done by the i-time consecutive nailing operations after the machine is turned on, as well as the total duration ti of the i-time consecutive nailing operations; (3) Dynamically adjust the protection temperature threshold Te of the power element according to the total time ti that Wi reaches the predetermined threshold Wn; (4) When the work Wi done in time ti reaches the threshold Wn = 300 J or the total duration ti exceeds tmax = 20 s, i is reset to zero and the total work Wi and total duration ti of consecutive i nailings are recalculated in a sliding time window manner; (5) The temperature of the power element is collected in real time through the temperature sensor. If the temperature exceeds the currently set protection temperature threshold Te, the controller triggers the over-temperature protection. If the temperature does not exceed the currently set temperature threshold Te, the fastener striking tool operates normally. The adjustment rule of the protection temperature threshold Te is: When the total duration ti ≥ time1, set the protection temperature threshold as Te1; When the total duration time1 > ti ≥ time2, set the protection temperature threshold as Te2; When the total duration time2 > ti, set the protection temperature threshold as Te3; Among them, time2 < time1, and Te1 < Te2 < Te3 is satisfied.

[0039] When the preset threshold Wn is set to 100J, the value of time1 is 8s, and the value of time2 is 4s.

[0040] When the duration ti ≥ 8s, set the protection temperature threshold Te1 as 60°C. When the total duration 4 ≤ ti < 8s, set the protection temperature threshold Te2 as 70°C. When the total duration ti < 4s, set the protection temperature threshold Te3 as 80°C. The difference between Te1, Te2, and Te3 can be arithmetic or non-arithmetic, and can be customized according to different models of the tool. Over-temperature protection includes a phased protection strategy: when the temperature exceeds Te, the controller reduces the output current of the power component; if the temperature continuously exceeds Te for a preset duration, forced shutdown and over-temperature alarm are issued.

[0041] The above is only the preferred and feasible embodiment of the present invention, showing and describing the basic principles, main features and advantages of the present invention. Therefore, the patent protection scope of the present invention is limited. Those skilled in the art should understand that the present invention is not limited by the above embodiments.

[0042] Without departing from the spirit and scope of the present invention, the present invention may have other embodiments. The present invention will also have various changes and improvements. Any technical solutions formed by equivalent replacement or equivalent transformation fall within the protection scope required by the present invention. The protection scope required by the present invention is defined by the appended claims and their equivalents. The technical features not described in the present invention can be realized by or adopted the existing technologies, which will not be elaborated here.

Claims

1. An adaptive temperature protection control method for a fastener striking tool, the fastener striking tool comprising a housing, an energy storage mechanism, a nailing mechanism, a lifting mechanism and a controller are arranged in the housing, the controller comprises a timing module and a power element, and a temperature sensor is also arranged in the housing; It is characterized in that The following steps are involved: (1) The fastener striking tool is started, (2) The total duration ti of consecutive i nailing operations after the machine is turned on is counted through the timing module; (3) dynamically adjusting the protection temperature threshold Te of the power element according to the total duration ti of the i consecutive nailing times; (4) When the cumulative number of nailing times i exceeds the preset threshold n or the total duration ti exceeds tmax, i is reset to zero, and the total duration ti of consecutive i nailing times is recalculated in a sliding time window manner; (5) The temperature of the power element is collected in real time through the temperature sensor. If the temperature exceeds the currently set protection temperature threshold Te, the controller triggers the over-temperature protection. If the temperature does not exceed the currently set temperature threshold Te, the fastener striking tool operates normally.

2. The adaptive temperature protection control method according to claim 1, characterized in that: The adjustment rule of the protection temperature threshold Te in step (2) is: When the total time ti ≥ time1, the protection temperature threshold is set to Te1; When the total duration time1 > ti ≥ time2, the protection temperature threshold is set to Te2; When the total duration time2 > ti, the protection temperature threshold is set to Te3; Among them, time2 < time1, and Te1 < Te2 < Te3.

3. The adaptive temperature protection control method according to claim 1 or 2, characterized in that: The preset threshold value n has a value range of 3≤n≤30, and the value of n is configured by the controller based on the tool model.

4. The adaptive temperature protection control method according to claim 3, characterized in that: When the preset threshold n is set to 8 times, the value of time1 is 8s and the value of time2 is 4s.

5. The adaptive temperature protection control method according to claim 1, characterized in that: The statistical method of the sliding time window is to retain the latest m nailing time records, where m is the window capacity and satisfies m≥n+1.

6. The adaptive temperature protection control method according to claim 1, characterized in that: The over-temperature protection includes a staged protection strategy: when the temperature exceeds Te, the controller reduces the output current of the power element; If the temperature continues to exceed Te for a preset period of time, the machine will be forced to shut down and an over-temperature alarm will be issued.

7. The adaptive temperature protection control method according to claim 1, characterized in that: It also includes a state condition for releasing the over-temperature protection, that is, the protection state is released when the temperature drops to Te-ΔT, where the value of ΔT is 5°C.

8. The adaptive temperature protection control method according to claim 1, characterized in that: The value range of tmax is between 10-25 seconds.

9. The adaptive temperature protection control method according to claim 2, characterized in that: The difference between Te1, Te2 and Te3 does not exceed 15°C, and the value range of Te3 is ≥80°C.

10. An adaptive temperature protection control method for a fastener striking tool, characterized in that: The following steps are involved: (1) The fastener striking tool is started, (2) The timing module is used to count the work Wi done by the i-time consecutive nailing operations after the machine is turned on, as well as the total duration ti of the i-time consecutive nailing operations; (3) Dynamically adjust the protection temperature threshold Te of the power element according to the total time ti that Wi reaches the predetermined threshold Wn; (4) When the work Wi done in time ti reaches the threshold Wn or the total duration ti exceeds tmax, i is reset to zero and the total work Wi and total duration ti of consecutive i nailings are recalculated in a sliding time window manner; (5) The temperature of the power element is collected in real time through the temperature sensor. If the temperature exceeds the currently set protection temperature threshold Te, the controller triggers the over-temperature protection. If the temperature does not exceed the currently set temperature threshold Te, the fastener striking tool operates normally. The adjustment rule of the protection temperature threshold Te is: When the total time ti ≥ time1, the protection temperature threshold is set to Te1; When the total duration time1 > ti ≥ time2, the protection temperature threshold is set to Te2; When the total duration time2 > ti, the protection temperature threshold is set to Te3; Among them, time2 < time1, and Te1 < Te2 < Te3.

Images