Water quality detection device with self-adaptive optical path

Abstract

The utility model relates to the technical field of water quality detection, in particular to a self-adaptive optical path water quality detection device which is provided with a light emitting end connected with a light source and a light receiving end connected with a photoelectric detection module, the light receiving end can receive light rays emitted by the light emitting end, and the self-adaptive optical path water quality detection device further comprises a driving device arranged at the light emitting end and / or the light receiving end; the driving device can adjust the distance between the light emitting end and the light receiving end; the distance between the light emitting end and the light receiving end can be adjusted through the driving device, so that the light receiving end can better receive the light emitted by the light emitting end to meet the analysis requirement of the spectrograph; or the light receiving end can receive enough light through a turbidity compensation method so as to meet the analysis requirement of the spectrograph.

Description

Technical Field

[0001] The utility model relates to the technical field of water quality detection, and more specifically, to a water quality detection device with an adaptive optical path. Background Art

[0002] In general water quality detection, spectral analysis is used. In spectral analysis, values such as COD, TOC, and BOD are related to known substance concentrations through the absorption method of ultraviolet spectra to measure different concentrations of corresponding substances. However, during the monitoring process, the actual water body contains particles such as silt and sediment, which are collectively referred to as turbidity in the water body. Turbidity will cause scattering and absorption of light.

[0003] In conventional methods, visible light is used to measure turbidity, and the influence of ultraviolet light absorption and scattering is established through the measured turbidity, then turbidity compensation is performed, and then the absorption of ultraviolet light is restored (eliminating the influence of turbidity on ultraviolet light absorption), so as to accurately predict the concentration of substances.

[0004] However, in actual detection, when the turbidity is relatively high, ultraviolet light is absorbed and scattered by high-concentration turbidity, so the ultraviolet light receiving end cannot receive ultraviolet light signals, resulting in ineffective restoration of ultraviolet light signals by turbidity compensation, and thus the concentration of substances cannot be detected. Summary of the Utility Model

[0005] In view of the above problems existing in the prior art, the utility model provides a water quality detection device with an adaptive optical path.

[0006] To solve the above technical problems, the utility model is solved by the following technical solutions:

[0007] A water quality detection device with an adaptive optical path has a light emitting end connected to a light source and a light receiving end connected to a photoelectric detection module. The light receiving end can receive the light emitted by the light emitting end, and further includes a driving device disposed at the light emitting end and / or the light receiving end; the driving device can adjust the distance between the light emitting end and the light receiving end.

[0008] Preferably, it includes a first mounting seat and a second mounting seat arranged opposite to each other;

[0009] The light emitting end and the light receiving end are respectively disposed on the first mounting seat and the second mounting seat;

[0010] The driving device is disposed at the first mounting seat and / or the second mounting seat.

[0011] Preferably, the second mounting seat is provided with a movable hole for the light receiving end to pass through;

[0012] The driving device is arranged on the second mounting seat and connected to the optical receiving end; the driving device can drive the optical receiving end to move relative to the optical transmitting end in the moving hole.

[0013] Preferably, the driving device is a driving motor or an electric push rod or a cylinder.

[0014] Preferably, the optical transmitting end includes a first seat body, a first through hole and a first protective groove;

[0015] The first through hole is arranged on the first seat body and penetrates through the first seat body;

[0016] The first protective groove is arranged on one side of the first seat body facing the optical receiving end;

[0017] A first light-transmitting member is arranged in the first protective groove, and a first optical fiber penetrates through the first through hole.

[0018] Preferably, the optical receiving end includes a second seat body, a second through hole and a second protective groove;

[0019] The second through hole is arranged on the second seat body and penetrates through the second seat body;

[0020] The second protective groove is arranged on one side of the second seat body facing the optical transmitting end;

[0021] A second light-transmitting member is arranged in the second protective groove, and a second optical fiber penetrates through the second through hole.

[0022] Preferably, a connecting rod is penetrated in the moving hole, and one end of the connecting rod is fixedly connected to the side of the second seat body far from the first seat body; the connecting rod has a third through hole that is communicated with the second through hole and through which the second optical fiber passes.

[0023] Preferably, a fixed motor is arranged on the first mounting seat and / or the second mounting seat, a brush head is arranged on the output shaft of the fixed motor, and the fixed motor can drive the brush head to clean the first light-transmitting member and / or the second light-transmitting member.

[0024] Preferably, a controller is further included; a magnet is arranged on the brush head; a position sensor capable of sensing the magnet is arranged on the first mounting seat and / or the second mounting seat; both the fixed motor and the position sensor are electrically connected to the controller.

[0025] Preferably, the brush head is provided with a fourth through hole and a threaded hole communicated with the fourth through hole;

[0026] The brush head is sleeved on the output shaft of the fixed motor through the fourth through hole;

[0027] A positioning bolt with one end abutted against the output shaft of the fixed motor is arranged in the threaded hole.

[0028] The utility model at least has the following beneficial effects:

[0029] In this application, the driving device can adjust the distance between the light emitting end and the light receiving end, so that the light receiving end can preferably receive the light emitted by the light emitting end to meet the analysis needs of the photoelectric detection module, or the light receiving end can receive sufficient light through the turbidity compensation method to meet the analysis needs of the photoelectric detection module. Specifically, the driving device makes the light emitting end and the light receiving end approach each other, so that the distance between the light emitting end and the light receiving end becomes smaller, thereby shortening the travel distance of the light emitted by the light emitting end to reach the light receiving end in water, reducing the degree of light absorption and scattering, and enabling part of the light to reach the light receiving end, so that the light receiving end can receive sufficient light or the light receiving end can receive sufficient light through the turbidity compensation method to meet the analysis needs of the photoelectric detection module. Description of the Drawings

[0030] Figure 1 Shows a schematic diagram of the water quality detection device in some embodiments of this application;

[0031] Figure 2 Shows a first schematic diagram of the driving motor connected to the light receiving end in some embodiments of this application;

[0032] Figure 3 Shows a second schematic diagram of the driving motor connected to the light receiving end in some embodiments of this application;

[0033] Figure 4 Shows a third schematic diagram of the driving motor connected to the light receiving end in some embodiments of this application;

[0034] Figure 5 Shows a schematic diagram of the water quality detection device provided with a brush head in some embodiments of this application;

[0035] Figure 6 Shows a schematic diagram of the brush head, the fixed motor and the position sensor in some embodiments of this application.

[0036] The names of the parts referred to by each digital label in the drawings are as follows:

[0037] 110. First body; 111. First through hole; 112. First protective groove; 113. First light-transmitting member; 210. Driven gear; 220. Second body; 221. Second through hole; 222. Second protective groove; 223. Second light-transmitting member; 230. Connecting rod; 231. Third through hole; 300. First mounting seat; 400. Second mounting seat; 420. Driving motor; 430. Driving gear; 440. Positioning seat; 500. Connecting seat; 600. Fixed motor; 700. Brush head; 710. Fourth through hole; 720. Threaded hole; 730. Mounting hole; 800. Position sensor. Detailed implementation mode

[0038] To further understand the content of the present utility model, the present utility model will be described in detail with reference to the accompanying drawings and embodiments. It should be understood that the embodiments are only for explaining the present utility model and not for limiting it.

[0039] As Figures 1-5 shown, this embodiment provides a water quality detection device with an adaptive optical path, including a light emission end and a light reception end. Among them, the light emission end is connected to a light source, and the light reception end is connected to a photoelectric detection module. Among them, the photoelectric detection module can be a photodetector or a spectrometer. In this embodiment, the photoelectric detection module is taken as an example of a spectrometer for explanation; the light source can emit light outward through the light emission end, and the position of the light reception end corresponds to the position of the light emission end, so that the light reception end can receive the light emitted by the light emission end, and then the spectrometer can analyze the light received by the light reception end. When in use, the water quality detection device of this embodiment is placed in water, the light source emits light from the light emission end to the light reception end, the light emitted by the light emission end is received by the light reception end after propagating in the water, and then the spectrometer analyzes the light received by the light reception end, so as to realize the detection of water quality.

[0040] However, in the above cases where the water quality is relatively good, the distance between the light emission end and the light reception end is fixed. Although part of the light emitted by the light emission end is absorbed and scattered under the action of refraction and reflection of impurities in the water, part of the light can still be received by the light reception end. And in this case, the influence of impurities in the water on the absorption and scattering of light can also be eliminated by the method of turbidity compensation, so that the light reception end can receive sufficient light, and the spectrometer can better detect the water quality and analyze the concentration of some substances in the water. However, when there are many impurities and high turbidity in the water, most or all of the light emitted by the light emission end is absorbed and scattered, so that the light reception end cannot receive the light emitted by the light emission end, or even by the method of turbidity compensation, the light reception end cannot receive sufficient light, thus affecting the analysis of the spectrometer.

[0041] To this end, in this embodiment, a driving device is provided at at least one of the optical transmitting end and the optical receiving end. By means of this driving device, the distance between the optical transmitting end and the optical receiving end can be adjusted, so that the optical receiving end can preferably receive the light rays emitted by the optical transmitting end to meet the analysis requirements of the spectrometer, or the optical receiving end can receive sufficient light rays through the turbidity compensation method to meet the analysis requirements of the spectrometer.

[0042] In specific applications, the water quality detection device of this embodiment is placed in water. The light source emits light rays from the optical transmitting end to the optical receiving end. When the turbidity of the water quality is relatively high and the optical receiving end cannot receive light rays or the optical receiving end cannot receive sufficient light rays through the turbidity compensation method, the driving device is started. By means of the driving device, the optical transmitting end and the optical receiving end are made to approach each other, so that the distance between the optical transmitting end and the optical receiving end becomes smaller, thereby shortening the travel distance that the light rays emitted by the optical transmitting end need to travel in water to reach the optical receiving end, and further reducing the degree of absorption and scattering of the light rays. As a result, part of the light rays can reach the optical receiving end, enabling the optical receiving end to receive sufficient light rays or enabling the optical receiving end to receive sufficient light rays through the turbidity compensation method to meet the analysis requirements of the spectrometer. Of course, in some water with relatively low turbidity, the distance between the optical transmitting end and the optical receiving end can also be appropriately increased through the adjustment of the driving device.

[0043] It can be understood that when it is mentioned that a driving device is provided at at least one of the optical transmitting end and the optical receiving end, specifically, the driving device can be provided at the optical transmitting end or at the optical receiving end. For example, a driving device can be provided at the optical transmitting end so that the driving device can drive the optical transmitting end to move relative to the optical receiving end, thereby adjusting the distance between the optical transmitting end and the optical receiving end; a driving device can also be provided at the optical receiving end so that the driving device can drive the optical receiving end to move relative to the optical transmitting end, thereby adjusting the distance between the optical transmitting end and the optical receiving end; further, the driving device can be set to be able to drive both the optical transmitting end and the optical receiving end simultaneously, so that the optical transmitting end and the optical receiving end approach or move away from each other, which can preferably improve the efficiency of adjusting the distance between the optical transmitting end and the optical receiving end.

[0044] In some embodiments, the water quality detection device includes a first mounting base 300 and a second mounting base 400, which are arranged opposite to each other. Among them, the light emitting end is arranged on the first mounting base 300, and the light receiving end is arranged on the second mounting base 400. The first mounting base 300 and the second mounting base 400 can preferably support the light emitting end and the light receiving end, improve the stability of the positions of the light emitting end and the light receiving end, and enable the light receiving end to still preferably receive the light emitted by the light emitting end when detecting some flowing water. Further, the driving device is arranged at the first mounting base 300 and / or the second mounting base 400 to adjust the distance between the light receiving end and the light emitting end.

[0045] It should be noted that the driving device can be directly connected to the light emitting end and / or the light receiving end to achieve the adjustment function, or can be directly connected to the first mounting base 300 and / or the second mounting base 400. By driving the relative movement of the first mounting base 300 and / or the second mounting base 400, the distance between the light emitting end and the light receiving end can be adjusted.

[0046] Further, a connecting seat 500 is also arranged between the first mounting base 300 and the second mounting base 400. The first end of the connecting seat 500 is connected to the first mounting base 300, and the second end of the connecting seat 500 is connected to the second mounting base 400. Through the arrangement of the connecting seat 500, the relative position stability between the first mounting base 300 and the second mounting base 400 can be preferably improved. At the same time, some cables, circuits or components can be accommodated inside the connecting seat 500, which has a certain protective effect.

[0047] In some embodiments, a movable hole (not shown in the figure) is arranged on the second mounting base 400. The movable hole penetrates through the second mounting base 400, and the light receiving end is inserted into the movable hole. The driving device is fixedly installed on the second mounting base 400 and is directly connected to the light receiving end. During application, the relative position between the first mounting base 300 and the second mounting base 400 remains fixed. When the distance between the light emitting end and the light receiving end needs to be adjusted, the driving device is started. The driving device can directly drive the light receiving end, driving the light receiving end to move towards or away from the light emitting end through the movable hole, thereby realizing the adjustment of the distance between the light emitting end and the light receiving end.

[0048] In some embodiments, the driving device can adopt a driving motor 420, an electric push rod, a cylinder or other devices or mechanisms that can drive the light receiving end to move relative to the light emitting end.

[0049] Further, the driving device in this embodiment adopts a driving motor 420, which is fixedly installed on the second mounting seat 400. A driving gear 430 is sleeved on the output shaft of the driving motor 420, and a driven gear 210 meshing with the driving gear 430 is arranged on the optical receiving end. A U-shaped positioning seat 440 is fixedly arranged at a position corresponding to the moving hole on the second mounting seat 400. The U-shaped positioning seat 440 is sleeved outside the driven gear 210, and the positioning seat 440 can limit the driven gear 210 in the axial direction of the driven gear 210. The optical receiving end is inserted through the positioning seat 440 and the driven gear 210, and the optical receiving end is threadedly connected to the driven gear 210. When the driving motor 420 works, the output shaft of the driving motor 420 directly drives the driving gear 430 to rotate, and then the driving gear 430 drives the driven gear 210 to rotate. Since the driven gear 210 is limited in the axial direction by the positioning seat 440, the driven gear 210 can drive the optical receiving end inserted through the positioning seat 440 and the moving hole to move relative to the optical transmitting end, so as to adjust the distance between the optical transmitting end and the optical receiving end.

[0050] In some embodiments, the optical transmitting end includes a first seat body 110. A first through hole 111 penetrating the first seat body 110 is arranged on the first seat body 110. A first protective groove 112 is arranged on one side of the first seat body 110 facing the optical receiving end, and the first protective groove 112 communicates with the first through hole 111. A first light-transmitting member 113 is arranged in the first protective groove 112. Specifically, a first optical fiber (not shown in the figure) is inserted into the optical transmitting end. The first end of the first optical fiber is inserted into the first through hole 111, and the second end of the first optical fiber is connected to a light source. In application, the light emitted by the light source can be transmitted by the first optical fiber, pass through the first through hole 111, and the first optical fiber can emit the light emitted by the light source outward, so that the light can pass through the first light-transmitting member 113 and be emitted to the optical receiving end, thereby realizing the reception of the light emitted by the light source by the optical receiving end.

[0051] It should be noted that the first light-transmitting member 113 can be fixedly installed in the first protective groove 112 by bonding, so that the first light-transmitting member 113 can play a role in sealing and protecting the first through hole 111 and preventing the first optical fiber from being polluted by water. Further, the first light-transmitting member 113 can be made of materials such as glass that can allow light to pass through, and this is not limited.

[0052] In some embodiments, the optical receiving end includes a second base body 220. A second through hole 221 penetrating the second base body 220 is provided on the second base body 220. A second protective groove 222 is provided on one side of the second base body 220 facing the optical transmitting end. The second protective groove 222 communicates with the second through hole 221. A second light-transmitting member 223 is provided in the second protective groove 222. Specifically, a second optical fiber (not shown in the figure) penetrates into the optical receiving end. Among them, the first end of the second optical fiber is introduced into the second through hole 221, and the second end of the second optical fiber is connected to the spectrometer. During application, the light emitted by the light source through the first optical fiber can penetrate through the second light-transmitting member 223 and enter the second optical fiber after propagating in water, realizing the reception of the light emitted by the light source by the optical receiving end. The second optical fiber can transmit the received optical fiber to the spectrometer, thereby realizing the analysis of water quality by the spectrometer.

[0053] It should be noted that the second light-transmitting member 223 can be fixedly installed in the second protective groove 222 by bonding, so that the second light-transmitting member 223 can play a role in sealing and protecting the second through hole 221, avoiding water pollution of the second optical fiber. Further, the second light-transmitting member 223 can be made of materials such as glass that can allow light to pass through, and this is not limited.

[0054] In some embodiments, the optical receiving end includes a connecting rod 230 inserted into the moving hole of the second mounting seat 400. One end of the connecting rod 230 is fixedly connected to the side of the second base body 220 away from the first base body 110, and a third through hole 231 communicating with the second through hole 221 is provided in the connecting rod 230. Specifically, the third through hole 231 penetrates the connecting rod 230 along the axial direction of the connecting rod 230. Among them, the first end of the second optical fiber penetrates into the second through hole 221 through the third through hole 231.

[0055] Further, the optical receiving end is inserted into the positioning seat 440 and the driven gear 210 through the connecting rod 230, and the connecting rod 230 is threadedly connected to the driven gear 210. When the driving motor 420 works, the driving motor 420 drives the driven gear 210 to rotate through the driving gear 430, and the rotation of the driven gear 210 can drive the connecting rod 230 to drive the second base body 220 to move relative to the first base body 110, thereby realizing the adjustment of the distance between the first base body 110 and the second base body 220 to shorten the distance that the light emitted by the light source needs to propagate in water.

[0056] Particularly, the setting of the connecting rod 230 realizes the connection and cooperation between the optical receiving end and the driving motor 420 on the one hand, and can also play a certain protective role for the second optical fiber through the setting of the third through hole 231 on the other hand.

[0057] Combined with Figures 5-6As shown, in some embodiments, the water quality detection device is provided with a fixed motor 600 and a brush head 700; the fixed motor 600 is disposed on at least one of the first mounting base 300 and the second mounting base 400, and the brush head 700 is disposed on the output shaft of the fixed motor 600; when the fixed motor 600 operates, the fixed motor 600 can drive the brush head 700 to rotate, so that the brush head 700 can clean the first light-transmitting member 113 and / or the second light-transmitting member 223.

[0058] It can be understood that since the first light-transmitting member 113 and the second light-transmitting member 223 are directly placed in water and directly contact with water when detecting water quality, some impurities in the water are likely to adhere to the first light-transmitting member 113 and the second light-transmitting member 223, affecting the effect of light passing through the first light-transmitting member 113 and the second light-transmitting member 223; specifically, when impurities in the water adhere to the first light-transmitting member 113, it will affect the light emitted by the light source from passing through the first light-transmitting member 113 into the water; when impurities in the water adhere to the second light-transmitting member 223, it will affect the light emitted by the light source in the water from passing through the second light-transmitting member 223 into the second optical fiber. By cleaning the first light-transmitting member 113 and the second light-transmitting member 223 with the brush head 700 in this embodiment, the effect of light passing through the first light-transmitting member 113 and the second light-transmitting member 223 can be improved preferably, and the accuracy of water quality analysis can be improved.

[0059] Exemplarily, taking the first light-transmitting member 113 as an example, the fixed motor 600 of this embodiment is disposed inside the first mounting base 300; the brush head 700 is in a long strip shape. When installed, the whole brush head 700 is parallel to the first light-transmitting member 113, and the first end of the brush head 700 is fixedly connected to the output shaft of the fixed motor 600. When the fixed motor 600 operates, the output shaft of the fixed motor 600 will drive the first end of the brush head 700 to rotate, so that the second end of the brush head 700 rotates around the first end of the brush head 700, and the first light-transmitting member 113 is located on the rotation path of the second end of the brush head 700. Therefore, when the brush head 700 rotates, it can clean the first light-transmitting member 113 to keep the first light-transmitting member 113 clean.

[0060] Of course, the brush head 700 can be set to only clean the first light-transmitting member 113 or only clean the second light-transmitting member 223, but in some embodiments, through design, the brush head 700 can also clean the first light-transmitting member 113 and the second light-transmitting member 223 at the same time to improve the working effect.

[0061] In some embodiments, a fourth through-hole 710 is provided on the circumferential side wall of the brush head 700 in the longitudinal direction. A threaded hole 720 communicating with the fourth through-hole 710 is also provided on the brush head 700. When installing the brush head 700 on the fixed motor 600, first, the brush head 700 is sleeved on the output shaft of the fixed motor 600 through the fourth through-hole 710. Then, a bolt is inserted into the threaded hole 720 so that the bolt abuts against the output shaft of the fixed motor 600, realizing the fixed installation of the brush head 700 on the fixed motor 600. When the fixed motor 600 works, the output shaft of the fixed motor 600 can preferably drive the brush head 700 to rotate synchronously.

[0062] In some embodiments, an installation hole 730 is formed at the second end of the brush head 700, and a magnet (not shown in the figure) is fixedly installed in the installation hole 730. A position sensor 800 is provided on the first mounting seat 300 and / or the second mounting seat 400. When the second end of the brush head 700 moves to a position corresponding to the first light-transmitting member 113, the position sensor 800 can sense the magnet.

[0063] Further, a controller (not shown in the figure) is provided inside or outside the water quality detection device. The controller is electrically connected to the fixed motor 600 and the position sensor 800. When the second end of the brush head 700 moves to a position corresponding to the first light-transmitting member 113, the position sensor 800 can send a trigger signal to the controller. By receiving this trigger signal, the controller can know that the brush head 700 is cleaning the first light-transmitting member 113 at this time.

[0064] Further, the controller can also be electrically connected to the light source and the spectrometer. When the controller receives the trigger signal sent by the position sensor 800, indicating that the brush head 700 is cleaning the first light-transmitting member 113 at this time, then the controller can control the light source and the spectrometer to stop working.

[0065] Of course, when the second end of the brush head 700 moves out of the position range of the first light-transmitting member 113, a trigger signal can also be sent to the controller. After receiving it, the controller can control the light source and the spectrometer to work, and then perform the work of water quality analysis. Further, the fixed motor 600 can also be electrically connected to the controller. Under the control of the controller, the cleaning work of the brush head 700 and the water quality detection work can be carried out separately.

[0066] In summary, the above are only the preferred embodiments of the present invention. All equivalent changes and modifications made according to the scope of the patent application of the present invention shall fall within the scope covered by the patent of the present invention.

Claims

1. A water quality detection device with adaptive optical path, comprising a light emitting end connected to a light source and a light receiving end connected to a photoelectric detection module, wherein the light receiving end is capable of receiving light emitted by the light emitting end, and characterized in that: comprising a driving device arranged at the light emitting end and / or the light receiving end; the driving device is capable of adjusting the distance between the light emitting end and the light receiving end; It comprises a first mounting seat and a second mounting seat which are arranged opposite to each other; The light emitting end and the light receiving end are respectively arranged on the first mounting seat and the second mounting seat; The driving device is arranged at the first mounting seat and / or the second mounting seat; The second mounting seat is provided with a movable hole for the light receiving end to pass through; The driving device is arranged on the second mounting seat and connected to the light receiving end; The driving device can drive the light receiving end to move relative to the light emitting end in the movable hole.

2. The water quality detection device according to claim 1, characterized in that: The driving device is a driving motor or an electric push rod or a cylinder.

3. The water quality detection device according to claim 1, characterized in that: The light emitting end comprises a first seat body, a first through hole and a first protective groove; The first through hole is disposed on the first base, and the first through hole passes through the first base; The first protection groove is arranged on a side of the first base body facing the light receiving end; A first light-transmitting member is disposed in the first protective groove, and a first optical fiber is inserted into the first through hole.

4. The water quality detection device according to claim 3, characterized in that: The light receiving end includes a second seat body, a second through hole and a second protective groove; The second through hole is disposed on the second base, and the second through hole passes through the second base; The second protection groove is arranged on a side of the second base body facing the light emitting end; A second light-transmitting member is disposed in the second protective groove, and a second optical fiber is inserted into the second through hole.

5. The water quality detection device according to claim 4, characterized in that: A connecting rod is passed through the movable hole, and one end of the connecting rod is fixedly connected to a side of the second seat body away from the first seat body; the connecting rod has a third through hole connected to the second through hole and for the second optical fiber to pass through.

6. The water quality detection device according to claim 4, characterized in that: A fixed motor is disposed on the first mounting seat and / or the second mounting seat, a brush head is disposed on the output shaft of the fixed motor, and the fixed motor can drive the brush head to clean the first light-transmitting member and / or the second light-transmitting member.

7. The water quality detection device according to claim 6, characterized in that: It also includes a controller; the brush head is provided with a magnet; the first mounting seat and / or the second mounting seat is provided with a position sensor capable of sensing the magnet; the fixed motor and the position sensor are both electrically connected to the controller.

8. The water quality detection device according to claim 6, characterized in that: The brush head is provided with a fourth through hole and a threaded hole connected to the fourth through hole; The brush head is sleeved on the output shaft of the fixed motor through the fourth through hole; A positioning bolt having one end abutting against the output shaft of the fixed motor is arranged in the threaded hole.

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