Method for open and closed loop control of a power tool and acquisition device and system for performing the method

Abstract

Disclosed is a method for open-loop and closed-loop control of a power tool (2) wherein the power tool (2) is connected to at least one acquisition device (3, 3 '), comprising the following method steps:-acquiring a first distance value by at least one sensor (14) of the acquisition device (3, 3'); inputting the at least one travel distance value into the acquisition device (3, 3 ') by means of the input device; adjusting the power tool (2) from a first operating mode having at least a first operating characteristic to a second operating mode having at least a second operating characteristic; acquiring at least a second distance value for a predetermined time period; transmitting at least one signal from the acquisition device (3, 3 ') to the power tool as a function of the acquired at least second distance value; and-after the predetermined signal has been received, adjusting the power tool (2) from the second operating mode to a third operating mode having at least a third operating characteristic. The invention further relates to an acquisition device for carrying out the method. In addition, the invention relates to a system comprising a power tool and an acquisition device for carrying out the method.

Description

Technical Field

[0001] The invention relates to a method for open-loop and closed-loop control of a power tool, wherein the power tool is connected to at least one acquisition device.

[0002] Furthermore, the invention relates to a detection device for carrying out the method.

[0003] Furthermore, the invention relates to a system comprising a power tool and a collection device for performing the method. Background Art

[0004] From the prior art, machining tools in the form of drilling devices, ie hammer drills, power drills or core drills, for producing cylindrical boreholes are widely known.When producing a borehole, in addition to the correct diameter, the actual drilling depth is also very important.

[0005] In order to measure or acquire the instantaneous borehole depth, there are also many devices according to the prior art with different designs and different functions. However, these existing devices are inaccurate and therefore problematic in terms of handling. Summary of the invention

[0006] SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above-mentioned problems.

[0007] This object is achieved by the subject-matter of independent claims 1, 9 and 12. Advantageous embodiments of the subject-matter according to the invention can be found in the dependent claims.

[0008] The object is achieved in particular by a method for open-loop and closed-loop control of a power tool, wherein the power tool is connected to at least one acquisition device.

[0009] According to the present invention, the following method steps are provided:

[0010] - collecting a first distance value by at least one sensor of a collecting device;

[0011] - inputting at least one travel distance value into the acquisition device via the input device;

[0012] - adjusting the power tool from a first operating mode having at least a first operating characteristic value to a second operating mode having at least a second operating characteristic value;

[0013] - collecting at least a second distance value within a predetermined time period;

[0014] - transmitting at least one signal from the acquisition device to the power tool in dependence on the acquired at least second distance value; and

[0015] - after the predetermined signal has been received, adjusting the power tool from the second operating mode to a third operating mode having at least a third operating characteristic value.

[0016] At least one sensor of the acquisition device can be based on transit time measurements, for example ultrasound measurements.

[0017] Specifically, there may be at least a first acquisition device and a second acquisition device, wherein the at least first acquisition device is capable of acquiring a first distance value and the at least second acquisition device is capable of acquiring a second distance value simultaneously. At the start of the drilling operation, the first distance value and the second distance value do not have to be exactly the same. Acquiring at least the first distance value and the second distance value is used to acquire the spatial position of the power tool relative to the workpiece to be machined. The greater the number of acquisition devices arranged at different positions of the housing of the power tool, the more accurate the determination of the spatial position of the power tool. During the continuous acquisition of distance values ​​by the first acquisition device and the second acquisition device during the drilling operation, if a predetermined difference between the acquired distance value of the first acquisition device and the acquired distance value of the second acquisition device is determined by means of the control device of the power tool, the power tool can be adjusted from a first operating mode having at least a first operating characteristic value to a second operating mode having at least a second operating characteristic value. Therefore, a skewed (i.e., non-orthogonal) orientation of the power tool relative to the workpiece being machined can be prevented.

[0018] According to an alternative embodiment, the power tool can be adjusted from a first operating mode having at least a first operating characteristic value to a second operating mode having at least a second operating characteristic value according to at least one characteristic value of the material to be machined. The first operating mode can be an enabled state of the power tool. The first operating characteristic value can be a first speed value of a driver (e.g., a motor). The second operating mode can also be an enabled state of the power tool or can be a disabled state. The second operating characteristic value can be a second speed value of the driver, which is less than or greater than the first speed value. The second speed value can also be zero so that the driver does not generate torque.

[0019] According to an advantageous embodiment, the adjustment of the power tool from a first operating mode having at least a first operating characteristic value to a second operating mode having at least a second operating characteristic value may be performed in dependence on the length of the travel distance. Thus, when a certain drilling depth (i.e., travel distance) has been reached, the rotation speed may be reduced to zero.

[0020] The first and / or second operating characteristic value may be a rotational speed or a torque.

[0021] According to another advantageous embodiment, the power tool can be adjusted from a first operating mode having at least a first operating characteristic value to a second operating mode having at least a second operating characteristic value in dependence on the diameter of the drill hole to be produced by the power tool. Thus, in a simple manner, the maximum rotational speed of the driver can be defined for the diameter of the drill bit or for the drilling tool, or the rotational speed of the driver can be limited.

[0022] According to another advantageous embodiment, the transmission of at least one signal from the acquisition device to the power tool can be carried out directly from the acquisition device to the power tool or by means of an external device according to the acquired at least second distance value. Thus, the specific drilling depth can be displayed to the user. The rotation speed of the drive can remain the same, can be increased or can be reduced.

[0023] The external device may be implemented in the form of a smartphone, a tablet or a smartwatch.

[0024] According to another advantageous embodiment, it may be that the third operating mode corresponds to a deactivated state of the power tool.In the case of the third operating mode, the rotational speed value and / or the torque value may be equal to zero.

[0025] According to another advantageous embodiment, the tool, which may be a power tool, is operated in a first operating mode and / or in a second operating mode in a first rotational direction and in a third operating mode in a second rotational direction. Thus, it may be facilitated to remove the drilling tool (e.g., a drill bit) from the borehole after a certain drilling depth has been reached.

[0026] According to another advantageous embodiment, the operating characteristic value of the power tool may be a rotational speed value or a torque value.

[0027] Furthermore, the object is achieved by a detection device for carrying out the method.

[0028] According to the invention, it is provided that at least one sensor, a control device, an interface device and a communication device are present.

[0029] According to an advantageous embodiment, there may be at least one sensor, a control device, an interface device and a communication device.

[0030] The interface device can be implemented in the form of a suitable form-fitting and / or force-based connection in order to produce a fixed or detachable connection of the detection device to the power tool.

[0031] The communication means may be based on wireless and / or wired data transmission techniques.

[0032] According to another advantageous embodiment, it may be that the acquisition device is detachably connectable to the power tool.

[0033] According to an alternative advantageous embodiment, it may be that the acquisition device is fixedly connected to the power tool.

[0034] Furthermore, the object is achieved by a system comprising a power tool and a collection device for performing the method.

[0035] According to the present invention, it is provided that the power tool comprises at least one power tool interface, and the acquisition device comprises at least one acquisition device interface, wherein the power tool interface and the acquisition device interface can be fixedly or detachably connected together.

[0036] Further advantages will become apparent from the following description of the drawings. In the drawings, different exemplary embodiments of the invention are illustrated. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The drawings, description and claims contain many features in combination. A person skilled in the art will also appropriately consider these features individually and combine them to produce other useful combinations.

[0038] In the attached picture:

[0039] Figure 1 A side view showing a power tool according to a first embodiment and a harvesting device according to the first embodiment connected to the power tool at the start of a drilling operation on a workpiece;

[0040] Figure 2 shows a side view of a harvesting device connected to a power tool during or at the end of a drilling operation on a workpiece;

[0041] Figure 3 shows a power tool and a collection device according to the first embodiment together with another side view of the device;

[0042] Figure 4 shows another side view of a power tool and a harvesting device according to a second embodiment; and

[0043] Figure 5 Another side view of a power tool having a first collection device and a second collection device is shown. DETAILED DESCRIPTION

[0044] Figure 1 A system 1 according to the invention is shown, which consists of a power tool 2 according to the invention and a collection device 3 .

[0045] The power tool 2 is implemented in the form of a hammer drill.

[0046] According to an alternative embodiment not shown in the drawings, the power tool 2 can also be embodied in the form of a power drill and a core drill.

[0047] The power tool 2 according to the first embodiment basically includes a housing 4 , a handle 5 , a tool holder 6 and a power source 7 .

[0048] The housing 4 has an upper side 4a, a lower side 4b, a front end 4c and a rear end 4d. Inside the housing 4 there are a driver 20, a transmission device, a control device 12 and a drive shaft. The control device 12 is used for open-loop and closed-loop control of various functions of the power tool 2 and is Figure 4 Shown in.

[0049] The handle 5 is located at the rear end 4d of the housing 4 of the power tool 2 and is used to hold and guide the power tool 2. An auxiliary handle 8 for additionally holding and guiding the power tool 2 is also located at the front end of the housing 4c of the power tool 2.

[0050] The drive 20 is implemented in the form of a brushless electric motor and is used to generate torque. The drive 20 is connected to the control device 12 so that the control device 12 can perform closed-loop control of functions of the drive 20 (such as speed and / or torque).

[0051] Furthermore, the drive 20, the transmission device, the control device 12 and the drive shaft are arranged inside the housing 4 and are arranged relative to each other so that the torque generated by the drive 20 can be transmitted to the transmission device and the drive shaft. The tool holder 6 is positioned on the upper side 4 of the housing 4. a The tool holder 6 is arranged on and relative to the drive shaft so that the torque is transmitted from the drive shaft to the tool holder 6. The tool holder 6 is used to receive and hold a tool 9. The tool 9 is implemented in the form of a drill bit in the figure.

[0052] The transmission and the drive shaft are not shown in the drawings.

[0053] The power source 7 serves to supply electrical energy to the power tool 2, in particular to consumers of the power tool 2, and is implemented in the form of a power connection. According to an alternative embodiment not shown in the figures, the power source can also be implemented in the form of a rechargeable battery or a plurality of rechargeable batteries.

[0054] As specifically in Figure 4 As can be seen in the figure, the power tool 2 according to the second embodiment can also include a communication device 10, which is also positioned in the interior of the housing 4 of the power tool 2 and is connected to the control device 12 via corresponding lines. By means of the connection of the control device 12 to the communication device 10 of the power tool 2, the power tool 2 can transmit data and values ​​in the form of signals. The communication device 10 of the power tool 2 is also implemented for sending and receiving data in the form of signals with an external device 19. The communication device 10 of the power tool 2 is implemented based on Bluetooth technology in this exemplary embodiment.

[0055] Alternatively, the communication device 10 may also be based on WiFi, NFC (Near Field Communication) or other suitable wireless data transmission technologies.

[0056] In addition, the communication device 10 may also be based on wired data transmission technology.

[0057] The acquisition device 3 basically comprises a housing 13, a sensor 14, a control device 15, an interface device 16, an input device and a communication device 17. The sensor 14, the control device 15 and the communication device 17 are positioned in the interior of the housing 13 of the acquisition device 3. The interface device 16 is arranged on the lower side of the housing of the acquisition device 3.

[0058] In the exemplary embodiment, the sensor 14 is implemented in the form of an ultrasonic sensor and is used to measure or collect distance values. The distance value may also be referred to as a travel distance, a spacing, or a stroke. Alternatively, the collection device 3 may also include more than one sensor 14. In the case where a plurality of sensors 14 are included in the collection device 3, the sensors 14 may all be sensors of the same type or may alternatively be sensors of different types.

[0059] The control device 15 is used to perform open-loop and closed-loop control on the functions of the acquisition device 3 and is connected to the sensor 14 via corresponding lines. Therefore, the control device 15 is specifically configured to enable the sensor 14 to acquire data in the form of signals and process them.

[0060] The communication device 17 of the acquisition device 3 is connected to the control device 15 and is used to transmit and receive data in the form of signals. By means of the communication device 17, the acquisition device 3 can communicate with an external device 19, that is to say exchange data and values ​​in the form of signals. The external device 19 can be the power tool 2, another power tool, a vacuum cleaner, a water supply or a smartphone.

[0061] In this exemplary embodiment, the external device 19 is implemented in the form of a smartphone. In this exemplary embodiment, the communication device 17 of the acquisition device is implemented based on Bluetooth technology. Alternatively, the communication device 17 can also be based on WiFi, NFC (near field communication) or other suitable wireless data transmission technology. In addition, the communication device 17 can also be based on wired data transmission technology.

[0062] The input device is used to enter data into the acquisition device 3 and is implemented in the form of an operator input area. The input device is not shown in the figures. Alternatively, the input device can also be implemented by an external device 19, so that specific commands or data are entered into the external device 19 (for example, a smartphone) and received by the acquisition device 3 by means of the communication device 17. For this purpose, the external device 19 also has a communication device 18.

[0063] In the present exemplary embodiment, the interface device 16 is used to detachably connect the acquisition device 3 to the housing 4 of the power tool 2. To this end, the interface device 16 is designed to have a threaded connection portion. The threaded connection portion is not shown in the drawings.

[0064] Alternatively or in addition, the interface device 16 can also be implemented in the form of a rail device, a snap-fit ​​connection or a suitable form-fit and / or force-based connection. The interface device 16 particularly comprises an electrical connection to the control device 12 of the power tool 2. Data in the form of signals can be exchanged between the control device 15 of the acquisition device 3 and the control device 12 of the power tool 2 by means of the electrical connection. When the sensor 14 has acquired a specific distance value, for example, a stop signal can be transmitted from the control device 15 of the acquisition device 3 to the control device 12 of the power tool 2 via the electrical connection, so that the control device 12 brakes (i.e., slows down) or stops the drive 20 of the power tool 2.

[0065] In order to perform the method for open-loop and closed-loop control of the power tool 2 according to the present invention, as shown in FIG. Figure 1 As shown, firstly, the first distance value A is detected by the sensor 14 of the detection device 3. The detected first distance value A corresponds to the initial distance of the sensor 14 from the material WS to be machined before starting machining or drilling and is transmitted to the control device 15 of the detection device 3 in the form of a signal.

[0066] The distance value is then input into the acquisition device 3 via an input device (not shown in the figure). The distance value may be the desired drilling depth into the material WS to be achieved at the end of the drilling operation. The distance value is fed into the control device 15 of the acquisition device 3, in which it is stored by means of a memory. The memory is not shown in the figure. More than one distance value may be fed into the control device 15 of the acquisition device 3 and stored in the memory.

[0067] In the next method step, the power tool 2 is adjusted from a first operating mode having at least a first operating characteristic value to a second operating mode having at least a second operating characteristic value. In the exemplary embodiment, the operating characteristic value (also an operating parameter) is the rotational speed of the drive 20 implemented in the form of an electric motor. The first rotational speed (i.e., the first operating characteristic value) is lower than the second rotational speed (i.e., the second operating characteristic value). The first rotational speed can also be zero, so that the power tool 2 is initially in an inactive state.

[0068] The sensor 14 further collects the second distance value within a predetermined time period or after a certain time period. The time period may be 10 seconds. The sensor 14 may collect the distance value at a time interval of 2 seconds to 5 seconds. These time intervals may be greater than or less than 2 seconds to 5 seconds.

[0069] One or more distance values ​​detected by the sensor 14 are transmitted in the form of a signal from the detection device 3 to the power tool 2. The transmitted signal depends on the distance value detected in each case or is related to the distance value detected in each case.

[0070] In a further method step, the power tool 2 is adjusted from the second operating mode to a third operating mode having at least a third operating characteristic value after the communication device 10 of the power tool 2 has received a predetermined signal. The predetermined signal corresponds to a distance value B acquired by the sensor, which corresponds to the desired or planned drilling depth. The drilling operation will be terminated, see Figure 2 .

[0071] The third operating characteristic value is a rotational speed corresponding to zero. In other words: the third operating mode of the power tool 2 corresponds to a deactivated state, in which the driver 20 no longer generates a rotational speed and therefore no longer generates a torque. Alternatively, the third operating mode may be a state in which the driver 20 rotates in a rotational direction opposite to that in the second operating mode. As a result, the tool 9 also rotates in an opposite rotational direction compared to the second operating mode. Due to the opposite rotational direction of the tool 9 (i.e., the drilling tool), no further drilling operation (material removal) occurs, or the borehole does not become deeper. In addition, as a result of the braking operation of the driver 20 and also as a result of the tool 9 rotating in the opposite direction, it is relatively clearly indicated to the user of the power tool 2 that the desired or planned drilling depth B has been reached.

[0072] Figure 5 Another embodiment of a power tool 2 having a first acquisition device 3 and a second acquisition device 3' is shown. The two acquisition devices 3, 3' are implemented to be essentially identical or have an identical construction. The two acquisition devices 3, 3' each acquire a distance value. The first acquisition device 3 and the second acquisition device 3' communicate with each other and in each case communicate with the control device 12 of the power tool 2, so that data and values ​​in the form of signals can be transmitted and received between the two acquisition devices 3, 3' and from each acquisition device 3 to the control device 12 of the power tool 2. Since the first acquisition device 3 and the second acquisition device 3' simultaneously acquire the first distance value and the second distance value, respectively, the spatial position can be determined, that is, the position of the power tool 2 relative to the workpiece WS to be machined. In the event of a deviation from a predetermined threshold value (for example, the x-axis, y When the angle is greater than 5° on the a-axis or z-axis, the control device 12 of the power tool 2 can stop the drive 20 or transmit a corresponding warning signal to the power tool 2 or the external device 19 through an output device (not shown in the figure).

[0073] List of Reference Numerals

[0074] 1 System

[0075] 2 Power Tools

[0076] 3,3' Collection equipment

[0077] 4 Power tool housing

[0078] 4a Upper side of the housing of the power tool

[0079] 4b Underside of the housing of the power tool

[0080] 4c Front end of the power tool housing

[0081] 4d Rear end of the housing of the power tool

[0082] 5. Handle

[0083] 6 Tool holder

[0084] 7 Power Supply

[0085] 8 Auxiliary handle

[0086] 9 Tools

[0087] 10 Communication device for power tools

[0088] 12 Control devices for power tools

[0089] 13. Housing of the acquisition device

[0090] 14. Sensors of the acquisition device

[0091] 15. Control device for acquisition equipment

[0092] 16. Interface device for acquisition equipment

[0093] 17 Communication device of acquisition equipment

[0094] 18 Communication device for external equipment

[0095] 19 External Devices

[0096] 20 Driver

[0097] WS Materials

Claims

1. A method for open-loop or closed-loop control of a power tool (2), wherein: The power tool (2) is connected to at least one acquisition device (3, 3'), The method is characterized by the following steps - collecting a first distance value by means of at least one sensor (14) of the collecting device (3, 3'); - inputting at least one travel distance value into the acquisition device (3, 3') via an input device; - adjusting the power tool (2) from a first operating mode having at least a first operating characteristic value to a second operating mode having at least a second operating characteristic value; - collecting at least a second distance value within a predetermined time period; - transmitting at least one signal from the acquisition device (3, 3') to the power tool in dependence on the acquired at least second distance value; and - after having received the predetermined signal, adjusting the power tool (2) from the second operating mode to a third operating mode having at least a third operating characteristic value.

2. A method for open-loop and closed-loop control of a power tool (2) according to claim 1, It is characterized in that The power tool (2) is adjusted from the first operating mode having at least the first operating characteristic value to the second operating mode having at least the second operating characteristic value in dependence on at least one characteristic value of the material to be machined.

3. A method for open-loop and closed-loop control of a power tool (2) according to claim 1 or 2, It is characterized in that The power tool (2) is adjusted from the first operating mode having at least the first operating characteristic value to the second operating mode having at least the second operating characteristic value according to the length of the travel distance.

4. Method for open-loop and closed-loop control of a power tool (2) according to at least one of claims 1 to 3, It is characterized in that The power tool (2) is adjusted from the first operating mode having at least the first operating characteristic value to the second operating mode having at least the second operating characteristic value depending on the diameter of the borehole to be produced by the power tool (9).

5. Method for open-loop and closed-loop control of a power tool (2) according to at least one of claims 1 to 4, It is characterized in that The at least one signal is transmitted from the acquisition device (3, 3') to the power tool (2) according to the acquired at least second distance value directly from the acquisition device (3, 3') to the power tool (2) or by means of an external device (19).

6. Method for open-loop and closed-loop control of a power tool (2) according to at least one of claims 1 to 5, It is characterized in that The third operating mode corresponds to a deactivated state of the power tool (2).

7. Method for open-loop and closed-loop control of a power tool (2) according to at least one of claims 1 to 6, It is characterized in that The tool (9) of the power tool (2) is operated in the first rotational direction in the first operating mode and / or the second operating mode and in the second rotational direction in the third operating mode.

8. Method for open-loop and closed-loop control of a power tool (2) according to at least one of claims 1 to 6, It is characterized in that These operating characteristic values ​​of the power tool (2) may be rotation speed values ​​or torque values.

9. A collection device () for carrying out the method according to at least one of claims 1 to 8, It is characterized in that There are at least one sensor (14), a control device (12), an interface device (16) and a communication device (15).

10. A collection device (3, 3') for performing the method according to claim 9, It is characterized in that The collecting device (3, 3') can be detachably connected to the power tool (2).

11. A collection device (3, 3') for performing the method according to claim 9, It is characterized in that The acquisition device (3, 3') is fixedly connected to the power tool (2).

12. A system (1) comprising a power tool (2) and a collection device (3, 3') for carrying out the method according to at least one of claims 1 to 8, It is characterized in that The power tool (2) at least comprises a power tool interface, and the acquisition device (3, 3') at least comprises an interface device (16), wherein the power tool interface and the interface device (16) can be fixedly or detachably connected together.

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