Interlocking titration water conservancy water pollution detection device

Abstract

The application relates to the technical field of water quality detection, in particular to a water conservancy engineering water body pollution detection device with interlocking titration, which comprises a locking structure, the locking structure comprises an elastic traction set arranged on a support, the elastic traction set is fixedly connected with a top rod, a locking block fixedly connected with the elastic traction set, a sleeve ring rotationally connected with the support, a processing test tube which is detachably arranged on the sleeve ring, a follow-up rotating piece coaxially fixedly connected with a rotating shaft of the sleeve ring, a locking groove arranged on the follow-up rotating piece, and the locking groove is matched with the locking block, so that the processing agent can be obliquely introduced into the processing test tube, splashing in the process of dropwise adding of the processing agent is prevented, and the dropwise adding precision of the reagent and the detection precision are improved.

Description

Technical Field

[0001] This invention relates to the field of water quality testing technology, specifically to an interlocking titration device for detecting water pollution in water conservancy projects. Background Technology

[0002] During routine water quality inspections and pollution source tracing in water conservancy projects, rapid pretreatment of the water body is necessary after sampling to mask irrelevant components such as heavy metal complexing agents, residual chlorine from oxidants, and suspended particles, so as to avoid cross-interference with subsequent spectral, electrochemical, or colorimetric detection.

[0003] Existing automated pretreatment platforms generally adopt the "rotary-test tube-coaxial titration" mode. Specifically, a stepper motor drives the cross support to rotate, stopping each test tube in sequence directly below the fixed titration device. The lifting mechanism vertically inserts the titration tube into the test tube opening, and the coaxial positioning ensures that the reagent falls into the geometric center.

[0004] However, to prevent contamination of the dropper, the equipment must maintain a safe clearance during the addition of the treatment liquid, resulting in a drop height difference of several millimeters to more than ten millimeters between the dropper and the liquid surface. When high-concentration acids, alkalis, or organic extractants fall freely at a rate of several drops per second, the transient shock wave formed by the droplets hitting the gas-liquid interface can induce splashing. Some reagent microbeads bounce off and adhere to the upper part of the inner wall of the test tube, unable to participate in the target reaction, resulting in incomplete pretreatment of the water and affecting the accuracy of subsequent detection. Summary of the Invention

[0005] The purpose of this invention is to provide an interlocked titration device for detecting water pollution in water conservancy projects, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A water pollution detection device for hydraulic engineering projects using interlocking titration, comprising:

[0008] A frame, on which a drive structure and a support are provided, wherein the drive structure is capable of driving the support to rotate;

[0009] The test tubes are configured with multiple sets that are equidistantly rotated in a circular pattern on the support.

[0010] A locking structure is provided on the bracket, which enables the shaft of the processing test tube to be locked or unlocked;

[0011] A lifting assembly is mounted on the bracket. A sample dispensing device is rotatably connected to the moving end of the lifting assembly. The lifting assembly cooperates with the top rod connected to the locking structure, enabling the rotating shaft of the processing test tube to switch from a locked state to an unlocked state.

[0012] An elastic holding assembly is connected with the lifting assembly and the sample dropping device, and can keep the sample dropping device in a vertical state;

[0013] A deflection structure is connected with the bracket and the sample dropping device, and can drive the sample dropping device and the processing test tube to deflect when the sample dropping device enters the processing test tube.

[0014] The water conservancy project water body pollution detection device with interlocking titration as described above: the driving structure comprises a driving device fixedly installed on the rack and a hollow pipe rotatably installed through the rack, and the hollow pipe is coaxially and fixedly connected with the bracket;

[0015] The driving structure further comprises a first gear coaxially and fixedly connected with a rotating shaft of the driving device and a second gear coaxially and fixedly connected with the hollow pipe, and the second gear is engaged with the first gear.

[0016] The water conservancy project water body pollution detection device with interlocking titration as described above: the locking structure comprises:

[0017] An elastic traction assembly is arranged on the bracket and fixedly connected with the top rod;

[0018] A locking block is fixedly connected with the elastic traction assembly;

[0019] A sleeve ring is rotatably connected with the bracket, and the processing test tube is detachably installed on the sleeve ring;

[0020] A follow-up rotating member is coaxially and fixedly connected with a rotating shaft of the sleeve ring, and a locking groove is arranged on the follow-up rotating member and matched with the locking block.

[0021] The water conservancy project water body pollution detection device with interlocking titration as described above: the elastic traction assembly comprises a lifting frame slidably installed on the bracket, the lifting frame is connected with the top rod and the locking block, and a guide block is arranged on an inner wall of the lifting frame and slidably connected with a limiting groove arranged on a side of the bracket;

[0022] The elastic traction assembly further comprises a first cylindrical spring connected with the bracket and the lifting frame.

[0023] The water conservancy project water body pollution detection device with interlocking titration as described above: the lifting assembly comprises a central shaft fixedly installed on the rack and a sliding sleeve plate slidably installed on the central shaft, and the central shaft penetrates through the hollow pipe;

[0024] An electric telescopic rod is fixedly installed on the central shaft, and an action end of the electric telescopic rod is fixedly connected with the sliding sleeve plate.

[0025] The sliding sleeve plate is rotationally connected to the sample dropping device at one end away from the electric telescopic rod.

[0026] The interlocking titration water conservancy water body pollution detection device as described above: the center shaft is provided with a groove along the length direction, and the inner wall of the sliding sleeve plate is provided with a protrusion in sliding fit with the groove.

[0027] The interlocking titration water conservancy water body pollution detection device as described above: the elastic retaining assembly comprises a follow-up deflection plate fixedly connected to the rotating shaft of the sample dropping device and a convex shaft fixedly installed on the sliding sleeve plate, and the follow-up deflection plate is in abutting fit with the convex shaft.

[0028] The elastic retaining assembly further comprises an elastic traction structure connecting the sliding sleeve plate and the sample dropping device, and the elastic traction structure can keep the follow-up deflection plate in abutting fit with the convex shaft.

[0029] The interlocking titration water conservancy water body pollution detection device as described above: the elastic traction structure comprises a first extension plate provided on the sample dropping device, a second columnar spring is rotationally installed on the first extension plate, and one end of the second columnar spring away from the first extension plate is rotationally connected to the lower end of the sliding sleeve plate.

[0030] The interlocking titration water conservancy water body pollution detection device as described above: the second extension plate is rotationally installed with an abutting shaft.

[0031] The deflection structure further comprises a support portion connected to the support, and the support portion is provided with a support plane in abutting fit with the abutting shaft.

[0032] Compared with the prior art, the interlocking titration water conservancy water body pollution detection device has the following advantages:

[0033] The interlocking titration water conservancy water body pollution detection device has the following advantages: BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 It is a structure schematic view of the water conservancy project water body pollution detection device of interlocking titration.

[0035] Figure 2 It is Figure 1 It is a structure enlarged view of A in the middle.

[0036] Figure 3 It is a structure schematic view of another angle of the water conservancy project water body pollution detection device of interlocking titration.

[0037] Figure 4 It is a structure schematic view of the hollow pipe and the center shaft in the water conservancy project water body pollution detection device of interlocking titration.

[0038] Figure 5 It is a structure schematic view of the support, the collar and the support part in the water conservancy project water body pollution detection device of interlocking titration.

[0039] Figure 6 It is a structure schematic view of the locking structure in the water conservancy project water body pollution detection device of interlocking titration.

[0040] Figure 7 It is an explosion view of the locking structure in the water conservancy project water body pollution detection device of interlocking titration.

[0041] Figure 8 It is a structure schematic view of the elastic retaining assembly in the water conservancy project water body pollution detection device of interlocking titration.

[0042] Figure 9 It is a structure schematic view of another angle of the elastic retaining assembly in the water conservancy project water body pollution detection device of interlocking titration.

[0043] In the figure: 1, rack; 2, driving device; 3, first gear; 4, second gear; 5, hollow pipe; 6, support; 601, limiting groove; 7, collar; 8, follow-up rotating part; 801, locking groove; 9, support part; 901, support plane; 10, processing test tube; 11, electric control valve; 12, lifting frame; 1201, guide block; 1202, top rod; 13, locking block; 14, first cylindrical spring; 15, center shaft; 1501, groove; 16, electric telescopic rod; 17, sliding sleeve plate; 1701, protrusion; 18, sample dropping device; 1801, first extension plate; 1802, second extension plate; 19, second cylindrical spring; 20, abutting shaft; 21, follow-up deflection plate; 22, convex shaft. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all.

[0045] Please refer to Figures 1-9 , as an embodiment of the present application, the interlocking titration water conservancy water pollution detection device, including: rack 1, processing test tube 10, locking structure, lifting assembly, elastic retaining assembly and deflection structure.

[0046] The rack 1 is provided with driving structure and support 6, the driving structure can drive the support 6 to rotate, the driving structure includes driving device 2 fixedly installed on the rack 1 and hollow tube 5 rotatably installed through the rack 1, the hollow tube 5 is coaxially fixedly connected with the support 6;

[0047] The driving structure further comprises a first gear 3 coaxially fixedly connected with the rotating shaft of the driving device 2 and a second gear 4 coaxially fixedly connected with the hollow tube 5, and the second gear 4 is engaged with the first gear 3.

[0048] In this embodiment, the driving device 2 is a stepper motor, and the support 6 is a cross-shaped structure, four groups of processing test tubes 10 are installed on the support 6, in this state, the driving device 2 can drive the support 6 to rotate 90° each time, specifically:

[0049] In use, the water to be detected is poured into one of the processing test tubes 10, and then the driving device 2 is operated to drive the first gear 3 connected thereto to rotate, and the first gear 3 and the second gear 4 are in meshing state, so that the second gear 4 drives the hollow tube 5 to rotate, and in turn drives the support 6 to rotate, thereby realizing the position switching of the processing test tube 10, so that the water to be detected can be sequentially injected into each processing test tube 10, realizing continuous detection.

[0050] Further, the circumferential radius of the first gear 3 is smaller than that of the second gear 4, thereby achieving the effect of speed reduction, and under this effect, the driving error of the driving device 2 can be reduced, so that in the case that the driving device 2 has driving error, the angle of the processing test tube 10 in the circumferential motion is more controllable, and the error is smaller, which ensures that the processing test tube 10 can be more coaxial with the sample dropping device 18 after the position switching is completed, preventing misalignment between the two, which causes the sample dropping device 18 to drop the processing liquid, and the processing liquid cannot accurately enter the processing test tube 10.

[0051] Please refer to Figure 2 , Figures 6-7The processing test tube 10 is provided with multiple groups and is installed on the support 6 in a circumferential equidistant rotating manner. The bottom of the processing test tube 10 is provided with an electric control valve 11. When the water body is completed for pre-treatment, the water body can be discharged from the processing test tube 10 in time through the electric control valve 11. After the processing test tube 10 is pressurized and the cleaning liquid is delivered at the top of the processing test tube 10, the cleaning liquid can be discharged from the electric control valve 11 after the cleaning of the processing test tube 10 is completed, so as to realize the cleaning of the processing test tube 10, prevent the water body or the treatment liquid from being left in the processing test tube 10, and improve the subsequent detection accuracy.

[0052] The locking structure is arranged on the support 6, and the locking structure can lock or unlock the rotating shaft of the processing test tube 10. The locking structure comprises:

[0053] The elastic traction kit is arranged on the support 6 and is fixedly connected with the top rod 1202. The elastic traction kit comprises a lifting frame 12 slidingly arranged on the support 6. The lifting frame 12 is connected with the top rod 1202 and a locking block 13. A guide block 1201 is arranged on the inner wall of the lifting frame 12. The guide block 1201 is slidingly connected with a limiting groove 601 arranged on the side of the support 6.

[0054] The elastic traction kit further comprises a first cylindrical spring 14 connected between the support 6 and the lifting frame 12.

[0055] The locking block 13 is fixedly connected with the lifting frame 12.

[0056] The sleeve ring 7 is rotationally connected with the support 6. The processing test tube 10 is detachably arranged on the sleeve ring 7.

[0057] The follow-up rotating part 8 is coaxially fixedly connected with the rotating shaft of the sleeve ring 7. The follow-up rotating part 8 is provided with a locking groove 801. The locking groove 801 is matched with the locking block 13.

[0058] In the initial state, the first cylindrical spring 14 is in a stretched state. Under the action of the first cylindrical spring 14, the lifting frame 12 has a tendency to move upward. Under this tendency, the locking block 13 can act in the locking groove 801, so that the rotating shaft of the processing test tube 10 can be locked. In this way, the processing test tube 10 can be prevented from swinging during the rotation of the support 6, so that the subsequent treatment liquid cannot be added dropwise.

[0059] Further, in the case that the rotation shaft of the processing test tube 10 is not locked, the rotation of the support 6 will inevitably cause the processing test tube 10 to swing, and in order to ensure the accuracy of the drop processing liquid, the processing test tube 10 needs to be in a static state from a swing state, i.e. additional waiting time is needed. In the embodiment, the rotation shaft of the processing test tube 10 is locked, and the above-mentioned waiting time is not needed, thus the pre-processing cycle is shortened to a certain extent.

[0060] Further, when the lifting assembly acts on the top rod 1202, the lifting frame 12 can move downward, at this time, the locking block 13 can move with the lifting frame 12, so that the locking block 13 can be separated from the locking groove 801, i.e. the rotation shaft of the processing test tube 10 is unlocked. At this time, when the sample drop device 18 rotates and abuts against the upper part of the rotation shaft of the processing test tube 10 at the end, the processing test tube 10 can be driven to rotate, realizing the inclined drop of the processing liquid, and preventing the processing liquid from splashing during the drop of the processing liquid.

[0061] Please refer to Figure 1 、 Figure 4 , the lifting assembly is arranged on the support 6, the action end of the lifting assembly is rotationally connected with the sample drop device 18, and the lifting assembly cooperates with the top rod 1202 connected with the locking structure, so that the rotation shaft of the processing test tube 10 can be switched from a locked state to an unlocked state. The lifting assembly comprises a center shaft 15 fixedly installed on the rack 1 and a sliding sleeve plate 17 slidingly installed on the center shaft 15, and the center shaft 15 penetrates the hollow tube 5;

[0062] The center shaft 15 is fixedly installed with an electric telescopic rod 16, and the action end of the electric telescopic rod 16 is fixedly connected with the sliding sleeve plate 17;

[0063] The end of the sliding sleeve plate 17 away from the electric telescopic rod 16 is rotationally connected with the sample drop device 18, the center shaft 15 is provided with a groove 1501 along the length direction thereof, the inner wall of the sliding sleeve plate 17 is provided with a protrusion 1701, and the protrusion 1701 is slidingly matched with the groove 1501.

[0064] In the embodiment, the electric telescopic rod 16 can drive the sliding sleeve plate 17 to move along the length direction of the center shaft 15, so that the sliding sleeve plate 17 can realize lifting. In this process, the sliding sleeve plate 17 will drive the sample drop device 18 to perform lifting action, so that the sample drop device 18 can be inserted into the processing test tube 10, and the accuracy of the drop of the processing liquid is improved.

[0065] In the cooperation of the convex 1701 and the groove 1501, the axial self-locking between the sliding cover plate 17 and the central shaft 15 can be achieved, which can effectively prevent the rotation of the sliding cover plate 17 relative to the central shaft 15, so that the position state of the sample dropping device 18 relative to the rack 1 is more stable, and the rotation of the sliding cover plate 17 relative to the central shaft 15 during the lifting process is prevented, which causes the misalignment of the sample dropping device 18 and the processing test tube 10 after the position switching, and further ensures the accuracy of the processing liquid dropping.

[0066] Please refer to Figures 6-9 The elastic retaining assembly connects the lifting assembly and the sample dropping device 18, and can keep the sample dropping device 18 in a vertical state. The elastic retaining assembly comprises a follow-up deflection plate 21 fixedly connected with the rotating shaft of the sample dropping device 18 and a convex shaft 22 fixedly installed on the sliding cover plate 17, and the follow-up deflection plate 21 and the convex shaft 22 are in abutting fit.

[0067] The elastic retaining assembly further comprises an elastic traction structure connecting the sliding cover plate 17 and the sample dropping device 18, which can keep the follow-up deflection plate 21 and the convex shaft 22 in an abutting state. The elastic traction structure comprises a first extension plate 1801 arranged on the sample dropping device 18, and a second columnar spring 19 is rotatably installed on the first extension plate 1801. One end of the second columnar spring 19 away from the first extension plate 1801 is rotatably connected with the lower end of the sliding cover plate 17.

[0068] In this embodiment, the second columnar spring 19 is in a stretched state in the initial state, and at this time the second columnar spring 19 has a tendency to pull the sample dropping device 18 to rotate relative to the sliding cover plate 17. However, in this state, the follow-up deflection plate 21 is in abutting fit with the convex shaft 22, so that the sample dropping device 18 can be kept stable in this state, and the dropping tube of the sample dropping device 18 is kept in a vertical state. Therefore, when the sample dropping device 18 moves towards the processing test tube 10 along with the sliding cover plate 17, the sample dropping device 18 can more accurately enter the processing test tube 10, preventing the sample dropping device 18 from being in an inclined state and causing the dropping tube to fail to enter the processing test tube 10 and interfere with the processing test tube 10.

[0069] The deflection structure connects the bracket 6 and the sample dropping device 18. When the sample dropping device 18 enters the processing test tube 10, the deflection structure can drive the sample dropping device 18 and the processing test tube 10 to deflect. The deflection structure comprises a second extension plate 1802 arranged on the sample dropping device 18, and an abutting shaft 20 is rotatably installed on the second extension plate 1802.

[0070] The deflection structure further comprises a support part 9 connected to the bracket 6, and a support plane 901 is arranged on the support part 9, and the support plane 901 is in abutment with the abutment shaft 20.

[0071] In the initial state, the sample dropping device 18 is in a vertical state, and as the sliding cover plate 17 is lowered, the sliding cover plate 17 will first abut against the top rod 1202 to drive the lifting frame 12 to move by the top rod 1202, at this time, the locking block 13 will move away from the locking groove 801 to unlock the rotating shaft of the processing test tube 10, and then the sliding cover plate 17 will continue to descend, and when the dropping tube at the lower end of the sliding cover plate 17 enters the processing test tube 10, the abutment shaft 20 will also abut against the support plane 901, so that the abutment shaft 20 can drive the sample dropping device 18 to deflect in cooperation with the support plane 901, and since the dropping tube of the sample dropping device 18 is inside the processing test tube 10, when the dropping tube acts on the processing test tube 10, it can drive the processing test tube 10 to deflect in the opposite direction, and the end of the dropping tube abuts against the inner wall of the processing test tube 10, in this state, when the sample dropping device 18 drops the processing liquid into the processing test tube 10, the processing liquid can flow along the side wall of the processing test tube 10 and finally enter the water body, thereby avoiding the phenomenon that the processing liquid splashes when it touches the water body due to the suspended dropping of the processing liquid, and avoiding the processing liquid splashing outside the processing test tube 10 or adhering to the side wall of the processing test tube 10 without effectively reacting with the water body, thereby improving the processing effect of the processing liquid on the water body.

[0072] It should be noted that during the deflection of the sample dropping device 18, the lower end of the dropping tube is always located above the rotating shaft of the processing test tube 10, thereby ensuring that the processing test tube 10 can perform a reverse deflection action when the sample dropping device 18 deflects.

[0073] Based on the above arrangement, during the downward movement of the sample dropping device 18, the rotating shaft of the processing test tube 10 can be first unlocked to ensure that the processing test tube 10 can perform a reverse deflection action when the sample dropping device 18 deflects, and secondly, when the dropping tube of the sample dropping device 18 enters the processing test tube 10, the sample dropping device 18 can deflect, and when the dropping tube acts on the upper part of the rotating shaft of the processing test tube 10, the processing test tube 10 is driven to rotate in the opposite direction, so that when the sample dropping device 18 adds the processing liquid into the processing test tube 10, the processing liquid can flow along the side wall of the processing test tube 10 to the water body, thereby avoiding the splashing of the processing liquid or the adhesion of the splashed droplets to the inner wall of the processing test tube 10, ensuring that the quality of the processing liquid added into the water body reaches the preset quality, and improving the pretreatment effect on the water body.

[0074] It will be obvious to a person skilled in the art that the application is not limited to the details of the foregoing exemplary embodiments and can be implemented in other concrete forms without departing from the spirit or essential characteristics of the application. The embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. No reference signs in the claims should be considered as limiting the scope of the claims to the identity of the reference signs therein.

[0075] Furthermore, it should be understood that although the description is made on the basis of the embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. A water pollution detection device for hydraulic engineering using interlocking titration, characterized in that, include: A frame, on which a drive structure and a support are provided, wherein the drive structure is capable of driving the support to rotate; The test tubes are configured with multiple sets that are equidistantly rotated in a circular pattern on the support. A locking structure is provided on the bracket, which enables the shaft of the processing test tube to be locked or unlocked; A lifting assembly is mounted on the bracket. A sample dispensing device is rotatably connected to the moving end of the lifting assembly. The lifting assembly cooperates with the top rod connected to the locking structure, enabling the rotating shaft of the processing test tube to switch from a locked state to an unlocked state. An elastic holding component connects the lifting component and the sample dispensing device, and the elastic holding component enables the sample dispensing device to be kept in a vertical position. A deflection structure connects the support and the sample dispensing device. When the sample dispensing device enters the processing test tube, the deflection structure can drive the sample dispensing device and the processing test tube to deflect. The drive structure includes a drive device fixedly installed on the frame and a hollow tube rotatably installed through the frame, wherein the hollow tube is coaxially and fixedly connected to the support. The drive structure further includes a first gear fixedly connected to the rotating shaft of the drive device and a second gear fixedly connected to the hollow tube, wherein the second gear meshes with the first gear. The lifting assembly includes a central shaft fixedly mounted on the frame and a sliding sleeve plate slidably mounted on the central shaft, the central shaft passing through the hollow tube; An electric telescopic rod is fixedly installed on the central shaft, and the actuating end of the electric telescopic rod is fixedly connected to the sliding sleeve plate. The end of the sliding sleeve away from the electric telescopic rod is rotatably connected to the sample dripping device; The elastic holding assembly includes a follower deflection plate fixedly connected to the rotating shaft of the sample dispensing device and a convex shaft fixedly installed on the sliding sleeve plate, wherein the follower deflection plate and the convex shaft are abutted and adapted to each other. The elastic holding assembly also includes an elastic traction structure connecting the sliding sleeve and the sample dripping device, the elastic traction structure enabling the follower deflection plate to remain in contact with the convex shaft. The elastic traction structure includes a first extension plate disposed on the sample dripping device, a second cylindrical spring rotatably mounted on the first extension plate, and the end of the second cylindrical spring away from the first extension plate being rotatably connected to the lower end of the sliding sleeve plate.

2. The water pollution detection device for interlocked titration in water conservancy projects according to claim 1, characterized in that, The locking structure includes: An elastic traction kit is mounted on the bracket, and the elastic traction kit is fixedly connected to the top rod. The locking block is fixedly connected to the elastic traction kit; A collar rotatably connected to the support, and the treatment test tube is detachably mounted on the collar; A follower rotating component is fixedly connected coaxially to the rotating shaft of the collar. The follower rotating component is provided with a locking groove, which is adapted to the locking block.

3. The water pollution detection device for interlocked titration in water conservancy projects according to claim 2, characterized in that, The elastic traction kit includes a lifting frame slidably mounted on the bracket, the lifting frame connecting the top rod and the locking block, and a guide block provided on the inner wall of the lifting frame, the guide block being slidably connected to a limiting groove provided on the side of the bracket; The elastic traction kit also includes a first cylindrical spring connecting the bracket and the lifting frame.

4. The water pollution detection device for interlocked titration in water conservancy projects according to claim 1, characterized in that, The central shaft has a groove along its length, and the inner wall of the sliding sleeve has a protrusion that slides in conjunction with the groove.

5. The water pollution detection device for interlocked titration in water conservancy projects according to claim 1, characterized in that, The deflection structure includes a second extension plate disposed on the sample dispensing device, and an abutment shaft is rotatably mounted on the second extension plate; The deflection structure also includes a support portion connected to the bracket, the support portion having a support plane that abuts and is adapted to the abutment shaft.

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