EP3554765A1 - Steuerungsverfahren für eine schlagende handwerkzeugmaschine - Google Patents
Steuerungsverfahren für eine schlagende handwerkzeugmaschineInfo
- Publication number
- EP3554765A1 EP3554765A1 EP17808505.6A EP17808505A EP3554765A1 EP 3554765 A1 EP3554765 A1 EP 3554765A1 EP 17808505 A EP17808505 A EP 17808505A EP 3554765 A1 EP3554765 A1 EP 3554765A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- temperature
- repetition rate
- control method
- acceleration
- exciter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 26
- 230000004044 response Effects 0.000 claims abstract description 5
- 230000007246 mechanism Effects 0.000 claims description 26
- 230000001133 acceleration Effects 0.000 claims description 21
- 238000009527 percussion Methods 0.000 claims description 9
- 230000001419 dependent effect Effects 0.000 claims description 6
- 230000003213 activating effect Effects 0.000 claims description 2
- 238000001514 detection method Methods 0.000 abstract 2
- 230000004913 activation Effects 0.000 abstract 1
- 230000008569 process Effects 0.000 description 6
- 230000000737 periodic effect Effects 0.000 description 5
- 238000010009 beating Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 230000000994 depressogenic effect Effects 0.000 description 3
- 244000052769 pathogen Species 0.000 description 3
- 230000001717 pathogenic effect Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D11/00—Portable percussive tools with electromotor or other motor drive
- B25D11/06—Means for driving the impulse member
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D11/00—Portable percussive tools with electromotor or other motor drive
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2216/00—Details of portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
- B25D2216/0007—Details of percussion or rotation modes
- B25D2216/0015—Tools having a percussion-only mode
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
- B25D2250/195—Regulation means
- B25D2250/201—Regulation means for speed, e.g. drilling or percussion speed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
- B25D2250/221—Sensors
Definitions
- the present invention relates to control methods for a striking hand tool, in particular a hand-held pneumatic hammer and a hand-held pneumatic electric chisel.
- the impact mechanism of a rotary hammer heats up in operation due to friction of moving components and thermal losses in the air spring. Typically, an operating temperature between 80 ° C and 150 ° C results. Gaskets, seals, dimensions and tolerances of the hammer mechanism are designed with regard to the typical operating temperature.
- the impact mechanism is cold, especially in cold working environments below freezing. The conditions are not optimal for the percussion and can prevent reliable starting of the striking mechanism.
- An inventive control method for a beating hand tool has the steps: detecting a switching state of an operating button, detecting a temperature with a temperature sensor, activating an electro-pneumatic percussion in response to actuation of the operating button, wherein a pathogen of the electro-pneumatic percussion along a working axis with a Repetition rate R is moved back and forth, whereby a via a pneumatic chamber coupled to the exciter racket is moved. If the temperature is greater than a limit temperature, the repetition rate from rest to a setpoint is continuously increased. A duration until reaching the setpoint is shorter than 10 cycles. If the temperature is lower than the limit temperature, a time to reach the setpoint is greater than 200 cycles,
- the repetition rate when the temperature is greater than the threshold temperature, the repetition rate is continuously increased with a first acceleration. Otherwise, if the temperature is lower than the limit temperature, in a first phase Controlled intermediate value, wherein at least partially the repetition rate is increased with the first acceleration, and in a second phase, the repetition rate continuously increased with a second acceleration up to the setpoint.
- the second acceleration may be less than 1/10 of the first acceleration.
- Fig. 1 a hammer drill
- Fig. 2 is a control diagram
- Fig. 3 is a repetition rate after switching on the hammer drill
- Fig. 5 is a control diagram
- Fig. 7 shows a repetition after switching on the hammer drill
- Fig. 1 shows a hammer drill 1 as an example of a beating hand-held machine tool.
- the hammer drill 1 has a tool holder 2 in which coaxial with a working axis 3, a drill, chisel or other beating tool 4 can be used and locked.
- the hammer drill 1 has a pneumatic impact mechanism 5, which can exert periodic punches in a direction of impact 6 on the tool 4.
- a rotary drive 7 can rotate the tool holder 2 continuously about the working axis 3.
- the pneumatic hammer 5 and the rotary drive are driven by an electric motor 8, which is fed from a battery 9 or a power line with electric current.
- the striking mechanism 5 and the rotary drive 7 are arranged in a machine housing 10.
- a handle 11 is typically arranged on a side facing away from the tool holder 2 of the machine housing 10. The user can hold the hammer drill 1 by means of the handle 11 in operation and lead.
- An additional auxiliary handle can be attached near the tool holder 2.
- a Operating button 12 is arranged, which the user can preferably operate with the holding hand.
- the electric motor 8 is turned on by operating the operating button 12. Typically, the electric motor 8 rotates as long as the operation button 12 is kept depressed.
- the pneumatic striking mechanism 5 has along the direction of impact 6 a pathogen 13, a bat 14 and optionally an anvil 15.
- the exciter 13 is forced by means of the electric motor 8 to a periodic movement along the working axis 3.
- the bat 14 is coupled via an air spring to the movement of the exciter 13.
- the air spring is formed by a closed between the exciter 13 and the bat 14 pneumatic chamber 16.
- the bat 14 moves in the direction of impact 6 until the bat 14 strikes the striker 15.
- the striker 15 is located in the direction of impact 6 on the tool 4 and transmits the impact on the tool 4.
- the exemplary striking mechanism 5 has a piston-shaped exciter 13 and a piston-shaped bat 14, which are guided by a guide tube 17 along the working axis 3.
- the exciter 13 and the bat 14 abut with their lateral surfaces on the inner surface of the guide tube 17.
- the pneumatic chamber 16 is closed by the exciter 13 and the bat 14 along the working axis 3 and by the guide tube 17 in the radial direction. Sealing rings in the outer surfaces of exciter 13 and bat 14 can improve the airtight completion of the pneumatic chamber 16.
- the exciter 13 is connected via a gear component with the electric motor 8.
- the transmission component transmits the rotational movement of the electric motor 8 in a periodic translational movement along the working axis 3.
- An exemplary transmission component based on an eccentric 18, which is connected to the electric motor 8.
- a connecting rod 19 connects the eccentric wheel 18 to the exciter 13.
- the exciter 13 moves synchronously with the electric motor 8.
- the electric motor 8 typically rotates in response to actuation of the operating button 12 and rotates as long as the user holds the operating button 12 pressed.
- the periodic forward and backward movement of the exciter 13 also begins and ends with the actuation or release of the operating button 12.
- Another example of such a transmission component is a wobble drive.
- the exciter 13 moves at a repetition rate R, which is proportional to the rotational speed of the electric motor 8.
- the transmission components between the electric motor 8 and the exciter 13 typically act in a fixed ratio reducing.
- the repetition rate R is in the range, for example, between 30 cycles per second (Hz) and 150 Hz.
- the racket 14 is coupled during operation by the pneumatic chamber 16 to the exciter 13 and moves the same repetition rate as the exciter 13.
- the coupling of the racket 14 to the exciter 13 takes place exclusively via an air spring.
- the air spring is based on a pressure difference between the pressure in the pneumatic chamber 16 and the pressure in the environment.
- the forced-motion exciter 13 increases or decreases the pressure in the pneumatic chamber 16 by means of its periodic axial movement.
- the racket 14 is accelerated by the pressure difference in the direction of impact 6 or counter to the direction of impact 6.
- the hammer drill 1 has a device control 20, which sets the repetition rate R of the exciter 13.
- the device controller 20 controls the electric motor 8.
- the electric motor 8 includes a speed control, which is set by the device controller 20, a target value for the speed.
- Speed control may also be implemented in the device controller 20 based on a speed sensor on the motor shaft and a negative feedback loop.
- the device controller 20 may limit a power input of the percussion mechanism 5 or a power input of the electric motor 8 to specify the repetition rate.
- the device controller 20 detects the position of the power button 12.
- the power button 12 has an off position to which the device controller 20 responsively provides a zero repetition rate, i. the striking mechanism 5 shuts off.
- the operation button 12 has a setting to which the device control 20 activates the striking mechanism 5 in response.
- the electric motor 8 is accelerated to a nominal value to obtain a predetermined target repetition rate 21 of the exciter 13.
- the operating button 12 automatically returns from the on position to the off position, if not kept pressed on the operating button 12.
- the increase of the repetition rate R when changing the operating button 12 from the off position to the on position takes place as a function of a temperature T of the hammer drill 1.
- a temperature sensor 22 in the machine housing 10 measures the current operating temperature T.
- the temperature sensor 22 can on the impact mechanism 5 or be arranged together with other electronics of the device controller 20 on a circuit board.
- Fig. 2 shows an exemplary control scheme of the device controller 20.
- Fig. 3 shows the behavior of the repetition rate R for different temperatures. The repetition rate is plotted over the ordinate; the time is plotted on the abscissa. The user presses the operating button 12. The operating button 12 changes from the off position to the or one of the one-position. The device controller 20 detects the depressed position at the time t2 (S1). The Schlagwerk 5 is now activated.
- the device controller 20 detects the temperature T from the temperature sensor 22 and compares the temperature T with a threshold temperature Tc (S2).
- the threshold temperature Tc is e.g. below 10 ° C, e.g. at 10 ° C, 5 ° C, 0 ° C, -5 ° C, -10 ° C.
- the limit temperature Tc may be set among other things depending on the lubricating oil used in the striking mechanism 5.
- the pathogen 13 begins to move back and forth.
- the exciter 13 is accelerated indirectly (S3), in the example by the electric motor 8.
- the repetition rate R increases up to the target repetition rate 21. Upon reaching the target repetition rate 21, the hammer drill 1 is completely ready for operation and the switch-on process is completed.
- the target repetition rate R is predetermined for a percussion mechanism 5 and typically the efficiency or percussion power of the striking mechanism 5 is highest at the repetition rate R.
- Typical nominal repetition rates of handheld rotary hammers range between 30 cycles per second (Hz) for larger impact mills and 150 Hz for smaller impact mills.
- the further behavior of the hammer drill 1 depends on the application and the use by the user (S5).
- the course of the repetition rate R is shown in dashed lines in FIG.
- the target repetition rate R is preferably reached as quickly as possible.
- a power consumption P of the impact mechanism 5, in this example the power consumption of the driving electric motor 8, is preferably not limited by a control or regulation.
- the exciter 13 and the electric motor 8 accelerate with the maximum characteristic values Pmax of the hammer drill 1.
- the target repetition rate R is set, for example, in a duration t1 of preferably less than 1 s, e.g. less than 0.5 s, less than 0.2 s.
- the percussion mechanism 5 can be used in less than 20 cycles, e.g. less than 10 cycles, more than 5 cycles fully operational.
- the switch-on process is now divided into two phases.
- the exciter 13 is accelerated to a repetition rate with a temperature-dependent intermediate value RTc.
- the intermediate value RTc is above 20%, for example above 40%, 60%, below 80%, for example below 70% of the target repetition rate 21.
- the intermediate value RTc can decrease as the temperature T is reached.
- the intermediate value RTc2 for -10 ° C is less than the intermediate value RT1c to -5 ° C.
- the intermediate values RTc are larger as the minimum repetition rate, from which, at least at room temperature (20 ° C), the bat 14 can follow the movement of the exciter 13. The bat 14 already begins to follow the movement of the exciter 13.
- the intermediate value RTc is preferably reached as quickly as possible.
- a power consumption P of the impact mechanism 5, in this example the power consumption of the driving electric motor 8, is preferably not limited by a control or regulation.
- the exciter 13 and the electric motor 8 accelerate with the maximum characteristic values Pmax of the hammer drill 1 (S6).
- the intermediate value RTc is achieved, for example, in a duration of preferably less than 1 s, for example less than 0.5 s, less than 0.2 s.
- the second phase begins.
- the power consumption P of the striking mechanism 5 is reduced to a lower value PTc (S8).
- the acceleration of the exciter 13 is significantly lower in the second phase than in the first phase.
- the acceleration can be lower by more than a factor of ten.
- the exciter 13 may be more than 5 seconds, e.g. take more than 10 s until the target repetition rate 21 is reached.
- the exciter 13 does not reach until after 200 cycles, e.g. after 500 cycles, the target repetition rate 21.
- the user clearly perceives the change in the switch-on process.
- the course of the repetition rate R is shown in FIG. 3 in a solid line for two different temperatures.
- the hammer drill 1 has a vibration sensor 23.
- the device controller 20 checks if the vibration values exceed a vibration limit. Unless the vibration values exceed the vibration limit, the control method does not differ from Fig. 2. If the vibration limit is exceeded, e.g. at time t3, the acceleration of the exciter 13 is increased.
- the exciter 13 can operate with the maximum acceleration, i. unlimited power consumption Pmax, to be accelerated up to the target repetition rate 21.
- the switch-on can be shortened thereby.
- Fig. 5 shows an exemplary control scheme of the device controller 20.
- Fig. 6 shows the behavior of the repetition rate R for different temperatures. The repetition rate is in plotted on the ordinate; the time is plotted on the abscissa. The user presses the operating button 12. The operating button 12 changes from the off position to or one of the on positions. The device controller 20 detects the depressed position at the time t2 (S1). The Schlagwerk 5 is now activated.
- the device controller 20 detects the temperature T from the temperature sensor 22 and compares the temperature T with a threshold temperature Tc (S2).
- the threshold temperature Tc is e.g. below 10 ° C, e.g. at 10 ° C, 5 ° C, 0 ° C, -5 ° C, -10 ° C.
- the limit temperature Tc may be set among other things depending on the lubricating oil used in the striking mechanism 5.
- the temperature T is above the threshold temperature Tc.
- the behavior is similar to the previously described methods.
- the exciter 13 is accelerated as fast as possible to the target repetition rate R (S3).
- the target repetition rate 21 (S4) has been reached, the hammer drill 1 is completely ready for operation and the switch-on process is completed.
- the further behavior of the hammer drill 1 depends on the application and the use by the user (S5).
- the course of the repetition rate R is shown in dashed lines in FIG.
- the temperature T is below the limit temperature Tc.
- the switch-on process is divided into two phases.
- the exciter 13 is maximally accelerated (S10).
- the power consumption P of the impact mechanism 5 is not limited.
- the exciter 13 is accelerated until reaching a default value Ro.
- the default value Ro is in the range between 80% and 150% of the target repetition rate 21.
- the default value Ro is temperature-independent. For example, due to the maximum acceleration, the default value Ro will be in a duration of preferably less than 1 s, e.g. less than 0.5 s, less than 0.2 s.
- the exciter 13 is moved, no movement of the bat 14 is to be expected.
- the exciter 13 is moved for a predetermined holding time with the default value Ro (S12). For example, until the time tw has passed after switching on.
- the holding time can be between 2 s and 20 s.
- the holding time is preferably temperature-dependent.
- the hold time decreases with increasing temperature T.
- Fig. 6 shows the behavior for a temperature at -5 ° C (dotted) and at -10 ° C (solid).
- the repetition rate R is reduced.
- the repetition rate R is reduced to the temperature-dependent intermediate value RTc.
- the Power consumption P are set to zero (S13), whereby the striking mechanism 5 expires and quickly slows down.
- the power consumption P can be reduced so far that the power consumption no longer compensates for friction losses and thermal losses.
- the striking mechanism 5 can also be actively braked.
- the reduction of the repetition rate R is terminated when the intermediate value RTc is reached.
- the intermediate value RTc can be selected in the same way as in the previous examples.
- the first phase is followed by the second phase, which is the same as in the previous examples.
- the power consumption P is increased to a temperature-dependent value PTc (S8).
- the exciter 13 is continuously accelerated until the target repetition rate 21 is reached (S9). Thereafter, the switch-on is completed.
- the hammer drill 1 may include a vibration sensor 23.
- the device control 20 checks during the reduction of the repetition rate R (S13 / S14) whether vibrations exceed a vibration threshold. If the vibration limit is not exceeded, the method runs as shown in Fig. 5.
- Fig. 7 illustrates this behavior in the solid line.
- the vibration limit value is exceeded, the reduction of the repetition rate R is terminated prematurely before the temperature-dependent intermediate value RTc is reached.
- the exciter 13 is immediately set in accordance with the second phase, i. Steps S8 and S9 to the target repetition rate 21 accelerates.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Percussive Tools And Related Accessories (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP16203920.0A EP3335837A1 (de) | 2016-12-14 | 2016-12-14 | Steuerungsverfahren für eine schlagende handwerkzeugmaschine |
PCT/EP2017/081634 WO2018108658A1 (de) | 2016-12-14 | 2017-12-06 | Steuerungsverfahren für eine schlagende handwerkzeugmaschine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3554765A1 true EP3554765A1 (de) | 2019-10-23 |
EP3554765B1 EP3554765B1 (de) | 2022-06-01 |
Family
ID=57629269
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16203920.0A Withdrawn EP3335837A1 (de) | 2016-12-14 | 2016-12-14 | Steuerungsverfahren für eine schlagende handwerkzeugmaschine |
EP17808505.6A Active EP3554765B1 (de) | 2016-12-14 | 2017-12-06 | Steuerungsverfahren für eine schlagende handwerkzeugmaschine |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16203920.0A Withdrawn EP3335837A1 (de) | 2016-12-14 | 2016-12-14 | Steuerungsverfahren für eine schlagende handwerkzeugmaschine |
Country Status (5)
Country | Link |
---|---|
EP (2) | EP3335837A1 (de) |
JP (1) | JP6845935B2 (de) |
KR (1) | KR102406100B1 (de) |
CN (1) | CN110072672B (de) |
WO (1) | WO2018108658A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110774236B (zh) * | 2019-11-20 | 2021-07-27 | 山东奥德燃气设备制造有限公司 | 一种压力可调的气动冲击工具 |
EP3960379A1 (de) | 2020-08-31 | 2022-03-02 | Hilti Aktiengesellschaft | Handwerkzeugmaschine |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19843644B4 (de) * | 1998-09-23 | 2004-03-25 | Wacker Construction Equipment Ag | Rohrschlagwerk mit Rückholluftfeder |
DE102007027898A1 (de) * | 2007-06-18 | 2008-12-24 | Robert Bosch Gmbh | Elektrowerkzeug mit Kaltstartfunktion |
DE102012206452A1 (de) * | 2012-04-19 | 2013-10-24 | Hilti Aktiengesellschaft | Handwerkzeugmaschine und Steuerungsverfahren |
DE102012208913A1 (de) * | 2012-05-25 | 2013-11-28 | Robert Bosch Gmbh | Schlagwerkeinheit |
DE102012208870A1 (de) * | 2012-05-25 | 2013-11-28 | Robert Bosch Gmbh | Schlagwerkeinheit |
EP2871028A1 (de) * | 2013-11-11 | 2015-05-13 | HILTI Aktiengesellschaft | Handwerkzeugmaschine |
EP3009236A1 (de) * | 2014-10-16 | 2016-04-20 | HILTI Aktiengesellschaft | Meisselnde Handwerkzeugmaschine |
-
2016
- 2016-12-14 EP EP16203920.0A patent/EP3335837A1/de not_active Withdrawn
-
2017
- 2017-12-06 EP EP17808505.6A patent/EP3554765B1/de active Active
- 2017-12-06 CN CN201780077004.1A patent/CN110072672B/zh active Active
- 2017-12-06 WO PCT/EP2017/081634 patent/WO2018108658A1/de unknown
- 2017-12-06 JP JP2019529852A patent/JP6845935B2/ja active Active
- 2017-12-06 KR KR1020197020092A patent/KR102406100B1/ko active IP Right Grant
Also Published As
Publication number | Publication date |
---|---|
JP2020500725A (ja) | 2020-01-16 |
CN110072672B (zh) | 2022-05-06 |
CN110072672A (zh) | 2019-07-30 |
JP6845935B2 (ja) | 2021-03-24 |
EP3335837A1 (de) | 2018-06-20 |
KR102406100B1 (ko) | 2022-06-10 |
US20190314970A1 (en) | 2019-10-17 |
WO2018108658A1 (de) | 2018-06-21 |
KR20190093645A (ko) | 2019-08-09 |
EP3554765B1 (de) | 2022-06-01 |
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