Internal vibrating device for compacting castable

Abstract

The invention relates to an internal vibrating device (10) for compacting a casting material, comprising a vibrating unit (12) having an electric motor (18), an electronic unit (14), which is electromechanically coupled to the vibrating unit (12) via a hose connection (24) in order to control the electric motor (18), and a power supply unit (16), the power supply unit is used for supplying power to the electronic unit (14) and the electric motor (18). According to the invention, the electric motor (18) is controlled for a short time by means of the electronic unit (14) in such a way that a critical operating state, in particular a low-energy state of the power supply unit (16), can be displayed by means of a change in the rotational speed (n) of the electric motor.

Description

Technical Field

[0001] This invention relates to an internal vibratory compaction device for compacting castable materials. Background Technology

[0002] DE 103 54 002 A1 discloses an internal vibratory compaction device for compacting flowable materials. This device includes a compaction unit, within which is a vibration generator equipped with an electric motor and a running status detection device for detecting the operating status of the electric motor, such as the compaction running status of the compaction unit in concrete or its idling running status in air. The internal vibratory compaction device also includes a control device connected to the running status detection device, which controls the speed of the electric motor based on the detected operating status.

[0003] DE 10 2018 118 555 A1 discloses an internal vibratory device comprising a carrier with a portable support frame, wherein the support frame carries an energy storage device, at least one electric motor, and a coupling device for mechanical coupling with a vibratory unit driven by the electric motor, wherein the carrier is designed as a shoulder bag or backpack unit with at least one strap for carrying the carrier on the user's shoulder.

[0004] The objective of this invention is to reliably and without the need for additional auxiliary devices display changes in operating status to the operator of the internal vibratory equipment. Summary of the Invention

[0005] This invention relates to an internal vibratory compaction device comprising a vibratory unit with an electric motor, an electronic unit, and a power supply unit. The electronic unit is electromechanically coupled to the vibratory unit via a flexible hose connection for controlling the electric motor, and the power supply unit supplies power to the electronic unit and the electric motor. The electric motor integrated in the vibratory unit generates vibrations through an eccentric element driven by it, which compact the castable material by expelling any possible air bubbles. To address the aforementioned objective, this invention proposes that the electric motor can be briefly controlled by the electronic unit, enabling the display of critical operating states, particularly the low-energy state of the power supply unit, through changes in the motor's rotational speed. Particularly advantageously, reliable feedback on changes in operating states can be provided to the operator of the internal vibratory compaction device in a simple manner. Since no additional display components are required for the internal vibratory compaction device, additional costs in mass production can be saved. Furthermore, the display according to the invention is largely protected against damage and is unaffected by any form of contamination. Critical operating states should be understood as conditions affecting the operation of the internal vibratory compaction device. Besides situations where the power supply unit's state of energy is too low, conditions such as an excessively high power supply unit's state of energy or malfunctions in the motor, electronic unit, and / or hose connectors can also lead to a critical operating state. Furthermore, damage to the vibration unit and / or power supply unit due to severe impacts or falls, detected by the accelerometer, can also trigger a critical operating state for the internal vibration equipment. The hose connectors are designed to be sufficiently rigid to ensure targeted guidance of the vibration unit via the gripping components; on the other hand, they should be sufficiently flexible to prevent vibrations from eccentric elements from being transmitted to the gripping components without buffering, thus protecting the operator.

[0006] In one improved embodiment of the invention, the electronic unit is proposed to be electrically coupled to the power supply unit via a tool-free detachable cable. Particularly advantageously, the power supply unit and the electronic unit can be easily interchanged, thus allowing the internal vibrating device to be powered by either batteries or rechargeable batteries for location-independent use, or by mains power for preferably very long-term use.

[0007] Preferably, the electronic unit of the internal vibratory compactor is designed as a grip for the operator to hold and operate the compactor via a hose connector, and the power supply unit is designed as a backpack unit that can be carried by the operator, having at least one replaceable battery pack. This allows for flexible use and improves safety by eliminating the need for a power cable connection; furthermore, the backpack unit, which can accommodate multiple replaceable battery packs, enables longer operating time. In this context, the power supply unit, and especially the backpack unit, is preferably designed to accommodate at least four replaceable battery packs. Since the motor is directly located within the compactor, vibrations generated by the mechanical shaft driving the eccentric element within the compactor are avoided, while vibrations generated by the motor within the compactor, indicating critical operating conditions, are more easily perceived by the operator through the grip.

[0008] To enable the operator to identify critical operating conditions as efficiently and accurately as possible, especially when the supply voltage of the power supply unit is below a voltage threshold, the electronic unit controls the motor. The electronic unit operates the motor with at least one short current pulse or voltage pulse, causing the current speed of the motor to change by at least 10%, preferably at least 30%. As an alternative or supplementary solution, the electronic unit can be designed to operate the motor using a current pattern or voltage pattern consisting of a specific sequence of current pulses or voltage pulses.

[0009] One improved design proposes a hose connector that mechanically transmits the control of the motor generated by the electronic unit to the gripping component. This allows the operator to tactilely perceive changes in motor speed through the gripping component without the need for additional tools. Under appropriate vibration intensities, vibrations (e.g., in the form of a humming sound) can also be perceived audibly within a distance of at least one meter around the gripping component. Furthermore, the auditory and / or tactile feedback can be enhanced through special design of the gripping component, such as by incorporating a built-in resonator on the housing. Here, the resonator is designed to match the vibration frequency of the eccentric vibration generated by the motor in the vibrating component.

[0010] The number, intensity, and / or duration of current or voltage pulses can be adjusted via electronic units. Therefore, depending on the application scenario and the material to be compacted, the display of critical operating conditions can be more clearly distinguished from normal operating conditions. Attached Figure Description

[0011] The following is combined with Figures 1 to 3 The present invention will be described by way of example, wherein the same reference numerals in the figures denote the same components that have the same function.

[0012] The attached diagram shows: Figure 1 : A perspective view of an internal vibratory compaction device for compacting castable materials, which includes a compaction unit, an electronic unit designed as a gripping component, and a power supply unit designed as a backpack unit; Figure 2 In the first embodiment, a graph showing the change of the power supply voltage of the internal vibrating device over time, and a graph showing the change of the operation of the vibrating unit according to the invention over time when the power supply voltage is lower than the voltage threshold. Figure 3 In the second embodiment, a graph showing the operation of a vibrating unit with current mode or voltage mode according to the invention over time is provided. Detailed Implementation

[0013] Figure 1 The diagram shows an internal vibratory compaction device 10, comprising a compaction unit 12, an electronic unit 14, and a power supply unit 16. The compaction unit 12 is designed as a flask, with an electric motor 18 arranged inside. The electric motor drives an eccentric element 22 via a motor shaft 20. The eccentric element 22 causes the compaction unit 12 to vibrate, compacting the castable material, such as liquid concrete, by expelling any possible air bubbles through vibration. The compaction unit 12 is inserted into the castable material. For this purpose, the compaction unit 12 is coupled to the electronic unit 14 via a flexible hose connector 24. The electronic unit 14 is designed as a gripping component 26, within which is housed an electronic unit (not shown) for controlling or adjusting the electric motor 18 of the compaction unit 18. Depending on the pressing stroke of a main button 30 located on the housing 28 of the gripping component 26, the operator can set a target rotational speed for the electric motor 18, preferably configured as an EC motor, and the eccentric element 22 driven by it, thereby affecting the vibration. For this purpose, the electronic unit 14 includes a control or regulation unit and power electronics. The control or regulation unit manipulates the power electronics, preferably configured as a power bridge, via pulse width modulation (PWM), causing the power bridge to load each phase of the EC motor in a known manner using trapezoidal commutation or approximately sinusoidal commutation. When the main button 30 is released, the main button automatically resets under spring force, and the motor 18 stops operating. Furthermore, a locking device (not shown) for the main button 30 can be provided to maintain a stable speed of the motor 18.

[0014] The hose connector 24 not only has a cable for controlling or adjusting the motor 18 via the electronic unit 14, but also serves for mechanical coupling, allowing the operator to guide the vibratory unit 12 through the gripping component 26 in the mortar. Therefore, the hose connector 24 must meet the following requirements: on the one hand, it must have sufficient rigidity to ensure targeted guidance of the vibratory unit 12; on the other hand, it must be flexible enough so that vibrations generated by the eccentric element 22 are not transmitted to the gripping component 26 without buffering, thus protecting the operator.

[0015] The electronic unit 14 integrated in the grip component 26 is electrically coupled to the power supply unit 16 via a tool-free detachable cable 32. For this purpose, the cable 32 has a plug 34 that can connect to a corresponding plug (not shown) or a complementary interface of the cable 36 of the power supply unit 16. In the illustrated embodiment, the power supply unit 16 is shown as a backpack unit 38 that can be carried on the back by an operator, wherein the actual carrying frame of the backpack unit 38 and the corresponding carrying straps and / or securing straps are not shown. The backpack unit 38 has a housing 40 with a handle 42 for easy carrying by the operator. Furthermore, a flip-up cover 44 is provided, which can be opened via a handle 46 and locked in the closed state. The handle 46 also serves to lock the housing 40 onto or unlock it from the carrying frame. Behind the cover 44, multiple replaceable battery packs 48 can be inserted tool-free into corresponding replaceable receptacles. Preferably, up to four commercially available replaceable battery packs 48 for power tools can be accommodated to achieve the longest possible usage time. The power can be delivered from the replaceable battery pack 48 to the coupled electronic unit 14 by means of the start button 50.

[0016] The voltage rating of the commercially available replaceable battery pack 48 is determined by the connection method (parallel or series) of the individual energy storage batteries (not shown) integrated in the replaceable battery pack 48 and is typically an integer multiple (≥1) of the voltage of a single energy storage battery. The energy storage battery is typically designed as a chemical battery with one electrode arranged at one end and the other at the opposite end. Specifically, the energy storage battery has a positive electrode at one end and a negative electrode at the opposite end. Preferably, the energy storage battery is constructed as a lithium-based cylindrical battery, such as a lithium-ion battery, a lithium polymer battery, a lithium metal battery, etc., wherein the electrodes are arranged on the two planar ends of the cylinder. Alternatively, nickel-cadmium batteries, nickel-metal hydride batteries, or other suitable types of batteries may also be used. Common lithium-ion energy storage batteries typically have a voltage of 3.6V. For pouch cells and / or batteries using other electrochemical compositions, the voltage may vary. The present invention is not limited to a specific type or structure of energy storage battery, but is applicable to any replaceable battery pack 48, which replaces cylindrical batteries with prismatic batteries, pouch batteries, etc., but is typically a replaceable battery pack 48 with a voltage level of 18V. Therefore, the internal vibrating device 10 operates, for example, at a supply voltage of 36V U when two replaceable battery packs 48 that are themselves connected in parallel are connected in series.

[0017] Without limiting the scope of protection of this invention, a fixed or mobile power supply unit 16 can also be considered. This power supply unit, instead of the replaceable battery pack 48, can also be equipped with one or more AC / DC converters to convert the grid voltage to the required supply voltage U. Therefore, by connecting cables 32 and 36, simple replacement between the power supply unit 16 and the electronic unit 14 is achieved. Furthermore, the internal vibrating device 10 can be powered by batteries for unrestricted mobile use, or powered by the grid or generator for continuous use. The control and / or adjustment of the operating parameters of the internal vibrating device 10 and / or the display of operating data, such as vibration level and the energy status of the connected power supply unit 16, are achieved through a human-machine interface (HMI) 52, which is a touch screen or an LED display with buttons, constructed from the gripping component 26.

[0018] To display the critical operating state of the internal vibratory compactor 10 to the operator in a simple and reliable manner, the motor 18 in the vibratory compactor unit 12 is briefly controlled by the electronic unit 14 by changing its rotational speed n. As mentioned above, the critical operating state should be understood as the operation of the internal vibratory compactor 10 being affected. For example, a critical operating state may result from the power supply unit 16 being too low, too high, or from malfunction of the motor 18, electronic unit 14, and / or hose connector 24. Similarly, damage to the vibratory compactor unit 12 caused by severe impacts, drops, or other events, detected by the accelerometer 54 integrated in the vibratory compactor unit 12, may also trigger a critical operating state for the internal vibratory compactor 10. As a supplement or alternative, the corresponding accelerometer 54 may also be provided in the grip component 14 and the power supply unit 16.

[0019] Figure 2 The graph shows the supply voltage U provided by power supply unit 16 as a function of time t. It can be seen that the supply voltage U decreases exponentially because, for example, the replaceable battery pack 48 is almost completely discharged after a certain operating time. At time t1, the supply voltage U drops to a set voltage threshold U. Th The following is a summary of the process. To display this critical operating state to the operator in the most efficient and safest way possible, electronic unit 14 displays the information within a set time window T after time t1. F The motor 18 is controlled by a current-mode or voltage-mode operation consisting of a series of short-time current pulses or voltage pulses 56, so that the current speed n0 of the motor 18 is significantly increased, preferably by at least 10%, as the feedback speed n. F For example, in a time window T with a duration of 4 seconds. F In the middle, during three pulses, each lasting 1 second, time T P Internally, a current pulse or voltage pulse 56 can increase the rotational speed from n0 = 1000 rpm to n F>1100 rpm. To make the difference from the current rotational speed n0 more apparent, the rotational speed n can be increased by at least 30%. To ensure that the vibration patterns generated in the vibratory unit 12 in this manner can be perceived as clearly as possible by the operator on the gripping member 26, the hose connector 24 is designed such that the control generated by the electronic unit 14 on the motor 18 is mechanically transmitted to the gripping member 26. For example, the hose connector 24 may have reinforcing ribs or a wrapping layer designed for the resonant frequency of the current pulse or voltage pulse 56. Particularly advantageously, reliable feedback on changes in operating status can be provided to the operator of the internal vibratory device 10 in a simple manner. Therefore, there is no need to provide a display component for the internal vibratory device 10, and additional costs in mass production can be saved. Furthermore, if the vibration intensity is sufficient, the vibration can also be perceived audibly (e.g., in the form of a humming sound) within an environment of at least one meter around the gripping member 26. Furthermore, auditory and / or tactile feedback can be enhanced through special design of the gripping component 26, such as through a built-in resonator (not shown in detail) on the housing 30. Here, the resonator is designed to match the vibration frequency of the eccentric vibration generated in the vibrating component 12 by the motor 18.

[0020] Figure 3 This shows the voltage threshold U used to control the supply voltage U at time t1 when it drops to a set value. Th Another embodiment of the possible current mode or voltage mode in the following cases. (Compared to...) Figure 2 The difference is that the current mode or voltage mode consists of three current pulses or voltage pulses 56, which have two different pulse times T. P1 (Long), T P2 (Short) and two different feedback speeds n F1 n F2 Different feedback speeds n F1 n F2 It generates different vibration frequencies, which can be determined by the operator in conjunction with the pulse time T in the gripping component 26. P1 T P2Characterization patterns for specific critical operating states are perceived. Therefore, different current or voltage modes can be assigned to different possible critical operating states to more clearly distinguish them from normal operating states with typical rotational speeds n0, depending on the specific application scenario and the material to be compacted. Preferably, the current or voltage mode can be set and assigned to different critical operating states via the human-machine interface 52 of the gripping component 26. Furthermore, instead of steep-edge current or voltage pulses 56, a sloped or non-linear variation curve with rising or falling edges can also be selected or set. Therefore, the number, intensity, and / or duration of the current or voltage pulses 56 can preferably be changed by the electronic unit 14.

[0021] Finally, it should be noted that the scope of protection of this invention is not limited to... Figures 1 to 3 The embodiments shown are not limited to the specific values ​​mentioned in the text, especially regarding the duration T. F T P T P1 T P2 Rotational speed n0, n F n F1 n F2 And the curve showing the change in the supply voltage U. In addition, the gripping part 26 can also be designed as a D-shaped handle, such as the D-shaped handle commonly used in large electric hammers, or other shapes.

Claims

1. An internal vibratory compaction device (10) for compacting castable material, comprising a vibratory unit (12) with a motor (18), an electronic unit (14), and a power supply unit (16), wherein the electronic unit is electromechanically coupled to the vibratory unit (12) via a flexible hose connector (24) for controlling the motor (18), and the power supply unit is used to supply power to the electronic unit (14) and the motor (18), characterized in that, The electronic unit (14) can control the motor (18) for a short time, so that the critical operating state can be displayed by the change of the motor speed (n), especially the low energy state of the power supply unit (16).

2. The internal vibrating device (10) according to claim 1, characterized in that, The electronic unit (14) can be electrically coupled to the power supply unit (16) via a tool-free detachable cable (32).

3. The internal vibrating device (10) according to any of the preceding claims, characterized in that, The electronic unit (14) is designed as a gripping component (26) for the operator to grip and guide the vibrating unit (12) via the hose connector (24), and the power supply unit (16) is designed as a backpack unit (38) that can be carried by the operator, the backpack unit having at least one replaceable battery pack (48) that can be accommodated.

4. The internal vibrating device (10) according to any of the preceding claims, characterized in that, In the critical operating state, especially when the supply voltage (U) of the power supply unit (16) is lower than the voltage threshold (U0), Th When the electronic unit (14) operates the motor (18) with at least one short current pulse or voltage pulse (56), the current speed (n0) of the motor (18) is changed by at least 10%, preferably at least 30%.

5. The internal vibrating device (10) according to any of the preceding claims, characterized in that, In the critical operating state, especially when the supply voltage (U) of the power supply unit (16) is lower than the voltage threshold (U0), Th When the electronic unit (14) operates the motor (18) in a current pattern or voltage pattern consisting of a specific sequence of current pulses or voltage pulses (56).

6. The internal vibratory device (10) according to any one of claims 3 to 5, characterized in that, The hose connector (24) is designed such that the control generated by the electronic unit (14) on the motor (18) is mechanically transmitted to the gripping member (26).

7. The internal vibrating device (10) according to any of the preceding claims, characterized in that, In an environment at least one meter around the gripping component (26), the change in the rotational speed (n) of the motor (18) can be perceived by hearing.

8. The internal vibrating device (10) according to any one of claims 4 or 5, characterized in that, The current pulse or voltage pulse (56) can be adjusted in terms of its quantity, intensity and / or duration by the electronic unit (14).

9. The internal vibrating device (10) according to any of the preceding claims, characterized in that, The power supply unit (16), and especially the backpack unit (38), is designed to accommodate at least four replaceable battery packs (48).

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