Handheld ultrasonic drill

Abstract

A handheld ultrasonic drill. An output shaft (110) of a gun handle (100) of the ultrasonic drill extends into a housing (300) and is connected to a rotating assembly (410); a wireless receiving unit (420) is provided outside the rotating assembly (410); the housing (300) is also internally provided with a wireless transmitting unit (330); the wireless transmitting unit (330) is arranged opposite to the wireless receiving unit (420); an ultrasonic vibrator (500) is provided on the rotating assembly (410); an output end of the ultrasonic vibrator (500) is connected to a drill chuck (200); and the weight ratio of the drill chuck (200) to the ultrasonic vibrator (500) is 1.0-4.9. Replacing a drill bit of the drill chuck does not need unscrewing a nut, such that the steps of removing a nut and installing the nut are saved, thus shortening the time for drill bit replacement, and improving the machining efficiency of the ultrasonic drill. The weight ratio of the drill chuck to the ultrasonic vibrator is 1.0-4.9, such that the performance of the drill chuck and the ultrasonic vibrator is better matched, the ultrasonic vibrator can better transmit ultrasonic vibration to the drill chuck, and no vibration other than longitudinal vibration will occur, thereby improving the precision of machined surfaces, improving the machining quality and efficiency, and increasing the energy utilization rate.

Description

A handheld ultrasonic drill Technical Field

[0001] The present invention relates to the technical field of electric tools, in particular to a handheld ultrasonic drill. Background Art

[0002] At present, handheld ultrasonic drills on the market all use a collet and a nut to clamp the drill bit. When the drill bit needs to be replaced, the nut must be unscrewed from the front end of the collet, the original drill bit must be taken out of the collet, and the new drill bit must be clamped in the collet. Finally, the nut must be tightened to complete the drill bit replacement, resulting in a long drill bit replacement time, which affects processing efficiency. Secondly, during the drilling process, only longitudinal vibration is required, and no other vibration is required, otherwise it will affect the surface quality of the workpiece. Summary of the Invention

[0003] The present invention provides a handheld ultrasonic drill to solve the technical problem in the prior art that the drill bit of the ultrasonic drill takes a long time to replace, which affects the processing efficiency.

[0004] The present invention provides a handheld ultrasonic drill, which comprises: a gun handle, a drill chuck, a housing, a rotating assembly, and an ultrasonic vibrator; the output shaft side of the gun handle is connected to the housing, the output shaft of the gun handle extends into the housing, and the output shaft of the gun handle is connected to the rotating assembly to drive the rotating assembly to rotate; a rotating bearing is provided in the housing and sleeved on the outside of the rotating assembly; a wireless receiving unit is provided on the outside of the rotating assembly, and a wireless transmitting unit is also provided in the housing; the wireless transmitting unit and the wireless receiving unit are arranged opposite each other; the ultrasonic vibrator is provided on the rotating assembly and rotates coaxially with the rotating assembly; the output end of the ultrasonic vibrator is connected to the drill chuck for clamping a drill bit, and the weight ratio of the drill chuck to the ultrasonic vibrator is 1.0-4.9.

[0005] In some embodiments, a weight ratio of the drill chuck to the ultrasonic vibrator is 2.4-4.4.

[0006] In some embodiments, the vibration frequency of the handheld ultrasonic drill is 20 KHz-40 KHz.

[0007] In some embodiments, the handheld ultrasonic drill further includes: a damping bracket; the damping bracket includes: a mounting bracket, at least two damping buffers, and a support bracket; the mounting bracket is connected to the support bracket via at least two damping buffers; the mounting bracket is arranged on the outside of the shell, the support bracket has a support ring, and a positioning surface is provided on the side of the support ring facing away from the shell.

[0008] In some embodiments, an inner hole is provided in the middle of the support ring, and the axis of the rotating shaft of the rotating assembly passes through the inner hole of the support ring.

[0009] In some embodiments, the damping buffer has a damping cylinder and a damping telescopic rod, one end of the damping telescopic rod is located in the damping cylinder, and the other end of the damping telescopic rod is located outside the damping cylinder and connected to the support frame; the damping cylinder is connected to the mounting bracket.

[0010] In some embodiments, the mounting bracket is provided with a mounting clamp ring for connecting with the damping cylinder.

[0011] In some embodiments, the number of the damping buffers is three, corresponding to the number of the mounting snap rings, and the three mounting snap rings are evenly arranged on the mounting support around the rotation axis of the rotating assembly.

[0012] In some embodiments, the handheld ultrasonic drill further includes: a waterproof power plug; the waterproof power plug is disposed on the housing, and the waterproof power plug is electrically connected to the wireless transmitting unit.

[0013] The handheld ultrasonic drill provided by the present invention has the following beneficial effects: the handheld ultrasonic drill adopts a drill chuck to clamp the drill bit, so the drill bit of the drill chuck does not need to be unscrewed when replacing the drill bit, saving the steps of removing and installing the nut, thereby reducing the drill bit replacement time and improving the processing efficiency of the ultrasonic drill; in addition, the weight ratio of the drill chuck to the ultrasonic vibrator is 1.0-4.9, and the performance of the two is more compatible. The ultrasonic vibrator can better transmit ultrasonic vibration to the drill chuck, and no vibration other than longitudinal vibration occurs, thereby improving the processing surface accuracy, improving the processing quality and efficiency, and improving the energy utilization rate; secondly, by providing a damping bracket with two or more damping buffers, the mounting bracket is connected to the support bracket through the damping buffer. When the drill bit is about to penetrate the workpiece to be drilled, the damping buffer provides a certain buffering and damping effect, so that the thrust is released smoothly and the feed speed is consistent, which can ensure the speed stability of the ultrasonic drill during operation, prevent the workpiece to be drilled from being torn and burred during the drilling process, reduce the error caused by uneven human processing force or operational errors, and improve the processing effect and processing accuracy.

[0014] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] FIG1 is a schematic structural diagram of a handheld ultrasonic drill according to an embodiment of the present invention;

[0016] FIG2 is a schematic cross-sectional view of a handheld ultrasonic drill according to an embodiment of the present invention;

[0017] 3 is a schematic diagram of the structure of an ultrasonic vibrator and a drill chuck after decomposition according to an embodiment of the present invention;

[0018] FIG4 is a schematic diagram of a finite element analysis of an embodiment of the present invention in which the ratio of the ultrasonic vibrator to the drill chuck is within the range of 1.0-4.9;

[0019] FIG5 is a schematic diagram of a finite element analysis when the ratio of the ultrasonic vibrator to the drill chuck is less than 1.0 according to an embodiment of the present invention;

[0020] FIG6 is a schematic diagram of finite element analysis when the ratio of the ultrasonic vibrator to the drill chuck is greater than 4.9 according to an embodiment of the present invention;

[0021] FIG7 is a schematic diagram of finite element analysis of an embodiment of the present invention when the ratio of the ultrasonic vibrator to the drill chuck is within the range of 2.4-4.4.

[0022] In the figure, 100, gun handle; 110, output shaft; 120, coupling; 200, drill chuck; 300, housing; 310, mounting cavity; 320, rotating bearing; 330, wireless transmitting unit; 410, rotating assembly; 420, wireless receiving unit; 500, ultrasonic vibrator; 510, amplitude transformer; 600, damping bracket; 610, mounting support; 611, mounting retaining ring; 620, damping buffer; 621, damping cylinder; 622, damping telescopic rod; 630, support frame; 631, support ring; 632, positioning surface; 633, inner hole; 700, waterproof power plug; 800, drill bit. DETAILED DESCRIPTION

[0023] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0024] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0025] In the description of the present invention, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0026] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0027] Please refer to FIG. 1 to FIG. 3 together, and the handheld ultrasonic drill provided by the embodiment of the present invention will now be described.

[0028] As shown in FIG1 and FIG2 , a handheld ultrasonic drill in some embodiments of the present invention includes: a gun handle 100 , a drill chuck 200 , a housing 300 , a rotating assembly 410 , and an ultrasonic vibrator 500 ;

[0029] The housing 300 is disposed on the output shaft side of the gun handle 100 and has a mounting cavity 310 therein. The housing 300 is used to support the rotating assembly 410. A rotating bearing 320 is disposed within the housing 300 and is mounted on the outside of the rotating assembly 410. In some embodiments, referring to FIG. 2 , two rotating bearings 320 are provided, mounted sequentially on the front and rear sides of the rotating assembly 410. It should be noted that in this embodiment, the direction of the ultrasonic drill's rotating assembly 410 facing the drill chuck 200 is considered the front, and the direction opposite is considered the rear. In some embodiments, the rotating bearing 320 mounted on the front side of the rotating assembly 410 is an angular contact ball bearing, and the rotating bearing 320 mounted on the rear side of the rotating assembly 410 is a tapered roller bearing. These two rotating bearings 320 ensure stable rotation of the rotating assembly 410 within the housing 300.

[0030] 2 , in some embodiments, the gun handle 100 includes an output shaft 110 for driving the rotating assembly 410. The output shaft 110 extends into the housing 300 and is connected to the rotating assembly 410. The gun handle 100 is connected to a power source or a high-pressure gas source, utilizing the power or air to rotate the output shaft 110, thereby driving the rotating assembly 410 to rotate via the output shaft 110. In some embodiments, the output shaft 110 is connected to the rotating assembly 410 via a coupling 120 to drive the rotating assembly 410 to rotate.

[0031] Referring to Figures 1 to 3 , in some embodiments, the wireless receiving unit 420 is disposed outside the rotating assembly 410, and the ultrasonic transducer 500 is disposed on the rotating assembly 410 and rotates coaxially with the rotating assembly 410. A wireless transmitting unit 330 is also disposed within the housing 300, and the wireless transmitting unit 330 is disposed opposite the wireless receiving unit 420. The output end of the ultrasonic transducer 500 is connected to the drill chuck 200. In some embodiments, the ultrasonic transducer 500 includes a horn 510 that rotates coaxially with the rotating assembly 410. In some embodiments, the ultrasonic transducer 500 also includes an ultrasonic transducer, which includes a gland, piezoelectric ceramics, and an electrode sheet. This portion is similar to the prior art and will not be further elaborated. In some embodiments, the drill chuck 200 is disposed on the horn 510 and is used to clamp the drill bit 800.

[0032] The ultrasonic vibrator 500 is a device that converts electromagnetic energy into mechanical energy (acoustic energy) and is typically made of piezoelectric ceramics or other magnetostrictive materials. In some embodiments, the wireless receiving unit 420 is a wireless transmission receiving ring, which is mounted on the outside of the rotating assembly 410. The wireless transmitting unit 330 is a wireless transmission transmitting ring, corresponding to the wireless transmission receiving ring. The wireless transmitting unit 330 can be connected to a power source to transmit power to the wireless transmission receiving ring, which transmits power to the ultrasonic vibrator 500, converting it into ultrasonic vibrations. The ultrasonic vibrator 500 can then transmit ultrasonic waves to the drill chuck 200, enabling the drill bit 800 to perform ultrasonic vibration drilling, improving the drilling effect. In some embodiments, the handheld ultrasonic drill also includes a waterproof power plug 700; the waterproof power plug 700 is mounted on the housing 300 and is electrically connected to the wireless transmitting unit 330. In other words, the wireless transmitting unit 330 is connected to a power source via the waterproof power plug 700.

[0033] It should be noted that the drill chuck 200 can be a common three-claw drill chuck available on the market. A special drill chuck key can be used to unlock the three-claw grips of the drill chuck 200 to facilitate removal and installation of the drill bit 800. The drill bit of the drill chuck 200 does not need to be removed when replacing the drill bit, thus eliminating the need to remove and install the nut. This reduces drill bit replacement time and improves the processing efficiency of the handheld ultrasonic drill.

[0034] To ensure good vibration transmission between the drill chuck 200 and the ultrasonic vibrator 500, the weight ratio of the drill chuck 200 to the ultrasonic vibrator 500 is between 1.0 and 4.9. Figure 4 shows a finite element analysis of a handheld ultrasonic drill with a weight ratio of the drill chuck 200 to the ultrasonic vibrator 500 within this range. As shown in Figure 4, when this weight ratio requirement is met, the vibration capacity of the front end of the drill bit is maximized, and no vibration other than longitudinal vibration occurs. It should be noted that while there is some vibration loss at the rear end of the ultrasonic vibrator 500, this does not affect drilling quality. When the weight ratio of the drill chuck 200 to the ultrasonic vibrator 500 is less than 1.0, as shown in FIG5 , the front end of the drill bit clamped by the drill chuck 200 clearly vibrates in directions other than longitudinal vibration. This non-longitudinal vibration is unnecessary. A handheld ultrasonic drill only requires vibration in the longitudinal direction of the drill bit (i.e., longitudinal vibration). Non-longitudinal vibration will affect the surface accuracy of the workpiece drilled hole, thereby affecting the processing quality and possibly causing the processed material to be scrapped. In this case, the drill bit is severely worn, limiting its service life. When the weight ratio of the drill chuck 200 to the ultrasonic vibrator 500 is greater than 4.9, as shown in FIG6 , compared to FIG5 , not only is significant non-longitudinal vibration generated, but the vibration energy at the front end of the drill bit is also smaller, with the maximum vibration energy located at the drill chuck 200. This results in both energy loss and the occurrence of non-longitudinal vibration, seriously affecting processing quality and efficiency.

[0035] In some embodiments, the weight ratio of the drill chuck 200 to the ultrasonic transducer 500 is between 2.0 and 4.4. As shown in FIG7 , when the weight ratio of the drill chuck 200 to the ultrasonic transducer 500 is within this range, the vibration energy at the front end of the drill bit is maximized, while the vibration at the rear end of the transducer is minimized, eliminating vibration energy loss. This maximizes energy conversion and improves energy utilization. Furthermore, no vibration other than longitudinal vibration occurs, thereby improving the surface accuracy and processing quality of the drilled hole, as well as improving processing efficiency and reducing energy loss. Therefore, when the weight ratio of the drill chuck 200 to the ultrasonic transducer 500 is within a suitable range, the drill chuck 200 and the ultrasonic transducer 500 are more compatible, allowing the ultrasonic transducer 500 to better transmit ultrasonic vibrations to the drill chuck 200. It should be noted that in some embodiments, the vibration frequency of the handheld ultrasonic drill is between 20 kHz and 40 kHz. The vibration frequency of the handheld ultrasonic drill is related to the vibration frequency of the ultrasonic vibrator 500. Power is transmitted to the ultrasonic vibrator 500 via the wireless transmitting unit 330 and the wireless receiving unit 420, causing the output end of the ultrasonic vibrator 500 to vibrate. This vibration is then transmitted to the drill bit 800 clamped in the drill chuck 200, resulting in a vibration frequency of the drill bit of 20 kHz to 40 kHz. This means that the vibration frequency range of the handheld ultrasonic drill during operation is 20 kHz to 40 kHz. A handheld ultrasonic drill operating within this vibration frequency range, when used with the drill chuck 200 and ultrasonic vibrator 500 in the aforementioned weight ratio, achieves improved surface accuracy and processing quality.

[0036] In some embodiments of the present invention, referring to FIG1 and FIG2 , the handheld ultrasonic drill further includes a damping bracket 600. The damping bracket 600 includes a mounting base 610, at least two damping buffers 620, and a support bracket 630. The mounting base 610 is connected to the support bracket 630 via the at least two damping buffers 620. The mounting base 610 is disposed outside the housing 300. The support bracket 630 includes a support ring 631. A positioning surface 632 is provided on a side of the support ring 631 facing away from the housing 300. In some embodiments, the plane in which the positioning surface 632 lies is perpendicular to the rotation axis of the rotating assembly 410 (as shown by the dashed line A in FIG2 ). The positioning surface 632 of the support ring 631 is configured to mate with a workpiece to be drilled. When drilling is required, the positioning surface 632 mates with the workpiece to be drilled, allowing the drill bit 800 to be accurately positioned perpendicular to the plane of the workpiece to be drilled, thereby achieving rapid positioning. The mounting bracket 610 is connected to the support frame 630 through the damping buffer 620. When the drill bit 800 is about to penetrate the workpiece to be drilled, the damping buffer 620 provides a certain buffering and damping effect. In addition, at least two damping buffers 620 are provided, so that the thrust release is more stable and the feed speed is consistent, which can ensure the speed stability of the handheld ultrasonic drill during operation, prevent the workpiece to be drilled from tearing and burring during the drilling process, reduce errors caused by uneven human processing force or operational errors, and improve processing effects and processing accuracy.

[0037] Based on the above, referring to Figures 1 and 2 , in some embodiments, an inner hole 633 is provided in the middle of the support ring 631 . The axis of the rotating shaft of the rotating assembly 410 (shown as dashed line A in Figure 2 ) passes through the inner hole 633 of the support ring 631 . This ensures that the drill bit 800 clamped in the drill chuck 200 can pass through the support ring 631 , thereby more evenly distributing the thrust, ensuring smooth thrust release and consistent feed speed, thereby ensuring the speed stability of the handheld ultrasonic drill during operation. In some embodiments, the support ring 631 is a circular ring, with the center of the support ring 631 located on the axis of the rotating shaft of the rotating assembly 410 . This allows the drill bit 800 to pass through the center of the ring, distributing the thrust more evenly and effectively mitigating the thrust.

[0038] In some embodiments, referring to Figures 1 and 2, the damping buffer 620 includes a damping cylinder 621 and a telescopic damping rod 622. One end of the telescopic damping rod 622 is located within the damping cylinder 621, while the other end is located outside the damping cylinder 621 and connected to the support frame 630. The damping cylinder 621 is connected to the mounting bracket 610. In some embodiments, the damping cylinder 621 contains a damping filler, such as damping oil, to provide resistance to the extension and retraction of the telescopic damping rod 622, thereby providing a buffering effect. In some embodiments, the outer diameter of the telescopic damping rod 622 is smaller than that of the damping cylinder 621. The connection of the telescopic damping rod 622 to the support frame 630 can reduce obstruction of the front end of the handheld ultrasonic drill, providing a wider field of view for the worker, facilitating drilling operations, and enabling the worker to quickly locate the drilling location.

[0039] Based on the above, referring to Figures 1 and 2, in some embodiments, the mounting bracket 610 is provided with a mounting snap ring 611 for connecting to the damping cylinder 621. In some embodiments, the mounting snap ring 611 is sleeved on the outside of the damping cylinder 621, and the damping cylinder 621 is directly mounted within the mounting snap ring 611 using a snap or thread, thereby securing the damping buffer 620.

[0040] In some embodiments, referring to Figures 1 and 2 , there are three damping buffers 620, corresponding to three mounting rings 611. The three mounting rings 611 are evenly distributed on the mounting support 610 around the rotation axis of the rotating assembly 410 (see dashed line A in Figure 2 ). The three damping buffers 620 are evenly distributed around the rotating assembly 410 to better mitigate the thrust from the handheld ultrasonic drill. Compared to handheld drills equipped with only one damping buffer, this allows for smoother thrust release and consistent feed speed, ensuring speed stability during operation. Furthermore, compared to existing methods that employ a single damping bracket, two or more damping brackets can be interconnected, reducing the number of connections between the damping brackets and the ultrasonic drill body.

[0041] In summary, the handheld ultrasonic drill of this embodiment uses a drill chuck 200 to clamp the drill bit 800. Therefore, when replacing the drill bit 800 of the drill chuck 200, there is no need to unscrew the nut, saving the steps of removing and installing the nut, thereby reducing the drill bit replacement time and improving the processing efficiency of the handheld ultrasonic drill. In addition, the weight ratio of the drill chuck 200 to the ultrasonic vibrator 500 is 1.0-4.9, and the performance of the two is more compatible. The ultrasonic vibrator 500 can better transmit ultrasonic vibration to the drill chuck 200, and no vibration other than longitudinal vibration will occur, thereby improving the processing surface accuracy, improving the processing quality and efficiency, and improving energy utilization. Secondly, by providing a damping bracket 60 having at least two damping buffers 620, 0. The mounting bracket 610 is connected to the support frame 630 through the damping buffer 620. When the drill bit 800 is about to penetrate the workpiece to be drilled, the damping buffer 620 provides a certain buffering and damping effect, so that the thrust is released smoothly and the feed speed is consistent, which can ensure the speed stability of the handheld ultrasonic drill during operation, prevent the workpiece to be drilled from tearing and burring during the drilling process, reduce the errors caused by uneven human processing force or operational errors, and improve the processing effect and processing accuracy; the damping telescopic rod 622 is connected to the support frame 630 to reduce the obstruction of the field of view of the front end of the handheld ultrasonic drill, provide workers with a larger observation field of view, facilitate workers to perform drilling operations, and also facilitate workers to quickly locate the drilling position.

[0042] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A handheld ultrasonic drill, characterized in that: include: A gun handle, a drill chuck, a housing, a rotating assembly, and an ultrasonic vibrator; the output shaft side of the gun handle is connected to the housing, the output shaft of the gun handle extends into the housing, and the output shaft of the gun handle is connected to the rotating assembly to drive the rotating assembly to rotate; a rotating bearing is provided in the housing and is sleeved on the outside of the rotating assembly; a wireless receiving unit is provided on the outside of the rotating assembly, and a wireless transmitting unit is also provided in the housing; the wireless transmitting unit and the wireless receiving unit are arranged opposite to each other; the ultrasonic vibrator is provided on the rotating assembly and rotates coaxially with the rotating assembly; the output end of the ultrasonic vibrator is connected to the drill chuck for clamping a drill bit, and the weight ratio of the drill chuck to the ultrasonic vibrator is 1.0-4.

9.

2. The handheld ultrasonic drill according to claim 1, characterized in that: The weight ratio of the drill chuck to the ultrasonic vibrator is 2.4-4.

4.

3. The handheld ultrasonic drill according to claim 1, characterized in that The vibration frequency of the handheld ultrasonic drill is 20KHz-40KHz.

4. The handheld ultrasonic drill according to claim 1, wherein: Also includes: Damping bracket; The damping bracket includes: a mounting support, at least two damping buffers, and a support frame; the mounting support is connected to the support frame through at least two damping buffers; the mounting support is arranged on the outside of the shell, and the support frame has a support ring, and a positioning surface is provided on the side of the support ring facing away from the shell.

5. The handheld ultrasonic drill according to claim 4, characterized in that: An inner hole is provided in the middle of the support ring, and the axis of the rotating shaft of the rotating assembly passes through the inner hole of the support ring.

6. The handheld ultrasonic drill according to claim 4, characterized in that: The damping buffer has a damping cylinder and a damping telescopic rod, one end of the damping telescopic rod is located in the damping cylinder, and the other end of the damping telescopic rod is located outside the damping cylinder and connected to the support frame; the damping cylinder is connected to the mounting bracket.

7. The handheld ultrasonic drill according to claim 6, characterized in that: The mounting support is provided with a mounting clamping ring for connecting with the damping cylinder.

8. The handheld ultrasonic drill according to claim 7, wherein: The number of the damping buffers is three, corresponding to the number of the mounting snap rings, and the three mounting snap rings are evenly arranged on the mounting support around the rotation axis of the rotating component.

9. The handheld ultrasonic drill according to claim 1, wherein: Also includes: Waterproof power plug; The waterproof power plug is arranged on the housing, and the waterproof power plug is electrically connected to the wireless transmitting unit.

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