Crystallizer copper pipe radian measuring device

Abstract

The utility model provides a crystallizer copper pipe radian measuring device, which relates to the technical field of continuous casting crystallizer copper pipe detection and comprises a working table, a group of clamping mechanisms are arranged in the middle of the working table, and each clamping mechanism is composed of a first electric motor, a bidirectional threaded rod and a clamping plate. A set of conveying mechanism and a set of measuring mechanism are installed above the workbench. The conveying mechanism is jointly composed of a first positioning frame, a second positioning frame, a second electric motor and a conveying wheel. According to the crystallizer copper pipe radian measuring device, a special measuring mechanism is adopted, the positioning plate is hinged to the positioning frame through the rotating block and is elastically supported by the torsion spring, so that the roller on one side of the positioning plate can be in flexible contact with the inner wall of the crystallizer copper pipe, and the roller can move up and down along with the radian of the inner wall in the moving process of the extension pipe; and the positioning plate rotating block is driven to generate torque change.

Description

TECHNICAL FIELD

[0001] The utility model relates to continuous casting crystallizer copper pipe detection technical field especially relates to a crystallizer copper pipe camber measuring device. BACKGROUND

[0002] In the steel continuous casting production, the crystallizer copper pipe is the key component, and its camber precision directly influences the billet quality and production efficiency, and proper camber can make the billet shrinkage evenly, prevent air gap from generating, avoid the billet crack, recess defect, guarantee the continuous casting process safety and stability, however, the existing crystallizer copper pipe camber measuring method has many problems as follows:

[0003] The traditional mechanical measuring device, for example, uses the caliper, the micrometer, can only measure the local point of the crystallizer copper pipe, and relies on manual operation, leads to the camber measurement precision to be influenced by the human factor greatly and to exist error, and the measuring efficiency is low;

[0004] The early optical measuring technology has the progress although, but the equipment is expensive, the maintenance is difficult, is susceptible to the copper pipe inner wall condition and environmental disturbance, and the measurement precision and reliability are limited;

[0005] At present, there is lack of the measuring device that can consider high precision, high efficiency, simple operation and strong universality, cannot satisfy the strict requirement of modern continuous casting production to the copper pipe quality detection, so, the development of new type measuring device is of great significance, can solve the existing problem, improve the detection level, and promote the continuous casting technology development. UTILITY MODEL CONTENTS

[0006] The utility model discloses a crystallizer copper pipe camber measuring device, and staff adjusts the position of first positioning frame and second positioning frame, makes two conveying wheels clamp the extension pipe under the action of support spring, starts second electric motor, and its driving shaft drives the conveying wheel rotation connected with it. When the conveying wheel rotates, the extension pipe is controlled to automatically displace horizontally, and the third positioning frame, sensor, positioning plate and roller enter the inside of the crystallizer copper pipe.

[0007] The first aspect of the present disclosure provides a crystallizer copper pipe camber measuring device, specifically comprising: a workbench, a set of clamping mechanisms are installed in the middle position of the workbench, the clamping mechanism is composed of a first electric motor, a bidirectional threaded rod and a clamping plate, a set of conveying mechanisms and a set of measuring mechanisms are installed in the upper position of the workbench, the conveying mechanism is composed of a first positioning frame, a second positioning frame, a second electric motor and a conveying wheel, the clamping plate has two, a crystallizer copper pipe is installed between the two clamping plates, a threaded hole is formed in the bottom position of the two clamping plates respectively, the spiral directions of the two threaded holes are opposite, the bidirectional threaded rod passes through the inside of the threaded hole, and the measuring mechanism is composed of an extension pipe, a third positioning frame, a sensor and a positioning plate.

[0008] Further, two sliding holes are formed in the middle position of the workbench, the sliding holes are rectangular structures, two sliding grooves are formed in the bottom position of the holding plate, and the sliding grooves of the holding plate are engaged with the sliding holes.

[0009] Further, a rotating hole is formed in the bottom position of the workbench, a two-way threaded rod passes through the inside of the rotating hole, a positioning groove is formed in the middle position of the two-way threaded rod, the positioning groove is a circular ring structure, a positioning bolt is installed at the bottom position of the workbench, the upper position of the positioning bolt extends into the inside of the positioning groove, and the driving shaft of the first electric motor is connected with one side of the two-way threaded rod.

[0010] Further, one side of the workbench is provided with a stable plate with a threaded hole, and a first electric motor is installed at the outer side position of the stable plate.

[0011] Further, two stable plates are arranged at the upper position of one side of the workbench, two sliding holes are formed in the middle position of the stable plates, the sliding holes are cylindrical structures, two positioning rods are arranged at one side of the first positioning frame and the second positioning frame respectively, the positioning rods pass through the inside of the sliding holes and are provided with a supporting spring and a clamping spring outside.

[0012] Further, a second electric motor is installed at the inner side position of the first positioning frame, and a bolt needs to be installed between the second electric motor and the first positioning frame, rotatingly connected conveying wheels are installed at the bottom positions of the first positioning frame and the second positioning frame respectively, and the conveying wheels are two in number, wherein the center position of one of the conveying wheels is connected with the driving shaft of the second electric motor.

[0013] Further, one side of the extension pipe is provided with a third positioning frame, a group of rotating holes are formed in the two sides of the third positioning frame respectively, the rotating holes are cylindrical structures, there are two positioning plates, two rotating blocks are arranged at one side of the positioning plates, the rotating blocks pass through the inside of the rotating holes, a group of torsion springs are installed between the rotating blocks and the third positioning frame, so that the two positioning plates automatically assume an eight-shaped structure, a roller is installed at one side of the positioning plate, a sensor is installed at the outer side position of the third positioning frame in cooperation with a screw, and the rotating block of the positioning plate extends into the inside of the sensor.

[0014] The crystallizer copper pipe arc measurement device has the following beneficial effects:

[0015] The crystallizer copper pipe arc measurement device adopts a special measurement mechanism, the positioning plate is hinged with the positioning frame through the rotating block and is elastically supported by the torsion spring, so that the roller at one side of the positioning plate can be in flexible contact with the inner wall of the crystallizer copper pipe.

[0016] During the movement of the extension pipe, the roller moves up and down along with the inner wall arc, drives the rotating block of the positioning plate to change the torque;

[0017] The sensor selects a torque module of the prior art, which can accurately detect the torque of the rotating block, and a calculation module of the prior art, so that the arc of the crystallizer copper pipe can be accurately measured according to the moving range of the roller and the torque of the rotating block, the measurement precision is high, and the requirement of high-precision measurement of the arc of the crystallizer copper pipe in industrial production can be met.

[0018] The holding plate moves reversely synchronously under the driving of the bidirectional threaded rod, can stably hold the crystallizer copper pipe, and enables the crystallizer copper pipe to be stably measured.

[0019] The conveying wheel can stably hold and convey the extension pipe, and the stable mechanical structure design makes the device have high stability during operation, and reduces the influence of mechanical vibration or part shaking on the measurement result.

[0020] The conveying mechanism can automatically adjust the spacing under the action of the supporting spring, can adapt to extension pipes with different outer diameters, so that the device can measure the arc of crystallizer copper pipes with different inner diameters, and has strong universality. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings of the embodiments will be briefly introduced below.

[0022] The drawings described in the following description only relate to some embodiments of the present application, and are not a limitation of the present application.

[0023] In the drawings:

[0024] Figure 1 A schematic view of the axial side structure of the measuring device and the crystallizer copper pipe of the present application is shown after assembly;

[0025] Figure 2 A schematic view of the axial side structure of the present application is shown after the crystallizer copper pipe is removed;

[0026] Figure 3 A schematic view of the axial side structure of the present application is shown from the bottom angle; Figure 2

[0027] Figure 4 A schematic view of the axial side of the split structure of the conveying mechanism of the present application is shown;

[0028] Figure 5 A schematic view of the axial side structure of the workbench of the present application is shown from the bottom angle after being cut;

[0029] Figure 6 A schematic view of the axial side of the local cut structure of the measuring mechanism of the present application is shown;

[0030] Figure 7 A schematic view of the axial side structure of the present application is shown from the bottom angle; Figure 1 ​An enlarged structural schematic view of A in the figure.

[0031] List of reference signs

[0032] 1, workbench;

[0033] 2, clamping mechanism; 201, first electric motor; 202, bidirectional threaded rod; 203, clamping plate;

[0034] 3, conveying mechanism; 301, first positioning frame; 302, second positioning frame; 303, second electric motor; 304, conveying wheel;

[0035] 4, measuring mechanism; 401, extension pipe; 402, third positioning frame; 403, sensor; 404, positioning plate;

[0036] 5, crystallizer copper pipe. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme of the embodiments of the present application will be described clearly and completely below in combination with the drawings of the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the described embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0038] Embodiment one: please refer to Figures 1 to 7 :

[0039] The utility model provides a kind of crystallizer copper pipe camber measuring device, comprising: workbench 1, the middle position of workbench 1 is installed a set of clamping mechanism 2, clamping mechanism 2 is jointly composed of first electric motor 201, bidirectional screw rod 202 and holding plate 203, the middle position of workbench 1 is opened two sliding holes, sliding hole is rectangular structure, the bottom position of holding plate 203 is opened two sliding grooves, the sliding groove position of holding plate 203 and sliding hole are engaged, draw a conclusion, sliding hole cooperates sliding groove and can realize the effect that holding plate 203 moves position up and down, circumferential positioning, make holding plate 203 can be along sliding hole peak stable transverse movement, the bottom position of workbench 1 is opened a rotating hole, bidirectional screw rod 202 passes through the inside of rotating hole, the middle position of bidirectional screw rod 202 is opened a positioning groove, positioning groove is circular ring structure, the bottom position of workbench 1 is installed a set of positioning bolt, the upper position of positioning bolt extends to the inside of positioning groove, after positioning bolt is installed, the effect that bidirectional screw rod 202 rotating position transverse positioning can be realized, make bidirectional screw rod 202 can be stable autorotation, the drive shaft of first electric motor 201 and the side of bidirectional screw rod 202 are connected, control first electric motor 201 drive bidirectional screw rod 202 rotation, the side of workbench 1 is equipped with a firm plate with threaded hole, the outside position of firm plate is installed a first electric motor 201, staff needs to install bolt between threaded hole and first electric motor 201, after bolt is installed, the effect that first electric motor 201 installation position is firm is realized;

[0040] In the embodiments of the present disclosure, reference is made to Figures 1 to 7As shown, the upper position of the workbench 1 is provided with a set of conveying mechanisms 3 and a set of measuring mechanisms 4, the conveying mechanisms 3 are composed of a first positioning frame 301, a second positioning frame 302, a second motor 303 and conveying wheels 304, two stable plates are arranged on one side of the workbench 1 at the upper position, two sliding holes are arranged in the middle positions of the stable plates, the sliding holes are in a cylindrical structure, two positioning rods are arranged on one side of the first positioning frame 301 and the second positioning frame 302 respectively, the positioning rods pass through the interiors of the sliding holes and are provided with a supporting spring and a clamping spring outside, the two positioning rods are matched to realize the circumferential positioning effect of the first positioning frame 301 and the second positioning frame 302 respectively, so that the first positioning frame 301 and the second positioning frame 302 can stably displace horizontally, the supporting spring supports the first positioning frame 301 and the second positioning frame 302 to automatically approach the inside, a second motor 303 is arranged at the inside position of the first positioning frame 301, a worker needs to install a bolt between the second motor 303 and the first positioning frame 301, the bolt is installed to realize the stable assembly effect of the second motor 303 and the first positioning frame 301, a rotatingly connected conveying wheel 304 is arranged at the bottom position of the first positioning frame 301 and the second positioning frame 302 respectively, the conveying wheels 304 are two in number, the two conveying wheels 304 clamp the extension pipe 401 under the support of the spring, the center position of one of the conveying wheels 304 is connected with the driving shaft of the second motor 303, a worker stably connects the driving shaft and the center position of the conveying wheel 304 according to the wedge key mechanism in the prior art, controls the second motor 303 to drive the conveying wheel 304 to rotate, and the conveying wheel 304 can control the extension pipe 401 to automatically displace horizontally when rotating;

[0041] In the embodiment of the present disclosure, referring to Figures 1 to 7 As shown, the two holding plates 203 are arranged to clamp the crystallizer copper pipe 5, the bottom positions of the two holding plates 203 are respectively provided with a threaded hole, the screw directions of the two threaded holes are opposite, the bidirectional threaded rod 202 passes through the interiors of the threaded holes, and the bidirectional threaded rod 202 can control the two holding plates 203 to move synchronously and reversely when rotating, and the measuring mechanism 4 is composed of an extension pipe 401, a third positioning frame 402, a sensor 403 and a positioning plate 404;

[0042] In the embodiment of the present disclosure, referring to Figures 1 to 7As shown, one side of the extension pipe 401 is provided with a third positioning frame 402, and a group of rotating holes are formed on both sides of the third positioning frame 402, the rotating holes are cylindrical structures, and the positioning plate 404 has two, one side of the positioning plate 404 is provided with two rotating blocks, the rotating blocks pass through the inside of the rotating holes, and the rotating holes and the rotating blocks are matched to realize the hinged positioning effect of the positioning plate 404, a group of torsional springs are installed between the rotating blocks and the third positioning frame 402, the torsional springs are elastically supported after installation, so that the two positioning plates 404 are automatically in an eight-shaped structure, one roller is installed on one side of the positioning plate 404, a sensor 403 is installed on the outside of the third positioning frame 402 in cooperation with a screw, the rotating block of the positioning plate 404 extends to the inside of the sensor 403, the sensor 403 selects a torque module of the prior art as needed, and the sensor 403 can effectively and accurately detect the torque of the rotating block with reference to the prior art, it is concluded that the torsional spring supports the flexible contact of the roller and the inner wall of the crystallizer copper pipe 5, the extension pipe 401 can drive the third positioning frame 402, the sensor 403, the positioning plate 404 and the roller to move synchronously in the moving process, the roller can move up and down along with the curvature of the inner wall of the crystallizer copper pipe 5 in the moving process, at this time the sensor 403 receives the torque of the rotating block of the positioning plate 404, the calculation module of the prior art and the sensor 403 are electrically connected, the sensor 403 transmits the torque of the rotating block to the control module of the prior art, and the curvature of the crystallizer copper pipe 5 is measured by the moving amplitude of the roller and the torque of the rotating block.

[0043] In example two, on the basis of example one, referring to Figures 1 to 7 As shown, a controller of the prior art needs to be installed on the basis of the workbench 1, and the controller is electrically connected with the first electric motor 201, the second electric motor 303 and the sensor 403.

[0044] The working principle of the embodiment is as follows:

[0045] The mounting steps of the clamping mechanism 2 are as follows: the workers align the sliding grooves at the bottom of the two clamping plates 203 with the sliding holes of the workbench 1, so that the clamping plates 203 can be smoothly engaged on the sliding holes, the positioning bolts are installed at the bottom of the workbench 1, and the positioning bolts extend to the inside of the positioning grooves of the bidirectional threaded rod 202;

[0046] The first electric motor 201 is placed outside the stable plate with threaded holes on one side of the workbench 1, the mounting hole of the first electric motor 201 is aligned with the threaded hole on the stable plate, the first electric motor 201 is fixed on the stable plate by using bolts, the mounting position is ensured to be stable, and then the driving shaft of the first electric motor 201 is connected with one side of the bidirectional threaded rod 202;

[0047] The mounting step of the conveying mechanism 3, the staff passes the positioning rods on one side of the first positioning frame 301 and the second positioning frame 302 through the sliding holes of the stable plate respectively, and installs the supporting spring and the clasp spring outside the positioning rods in sequence, the cooperation of the two positioning rods realizes the circumferential positioning of the first positioning frame 301 and the second positioning frame 302, so that they can be stably displaced horizontally, and the supporting spring will support them to automatically close inward, the second electric motor 303 is installed on the inner side of the first positioning frame 301, the second electric motor 303 is stably assembled with the first positioning frame 301 by using the bolt, and the rotationally connected conveying wheels 304 are installed at the bottom positions of the first positioning frame 301 and the second positioning frame 302 respectively, the center position of one of the conveying wheels 304 is stably connected with the driving shaft of the second electric motor 303 through the wedge key mechanism of the prior art;

[0048] The mounting step of the measuring mechanism 4, the staff installs the third positioning frame 402 on one side of the extension pipe 401, passes the rotating blocks on one side of the two positioning plates 404 through the rotating holes on both sides of the third positioning frame 402, realizes the hinged positioning of the positioning plates 404 under the cooperation of the rotating holes and the rotating blocks, installs the torsion spring between the rotating blocks and the third positioning frame 402, elastically supports the two positioning plates 404 with the torsion spring, so that they automatically present an eight-shaped structure, installs the roller on one side of the positioning plate 404, installs the sensor 403 on the outside of the third positioning frame 402 by using the screw, ensures that the rotating block of the positioning plate 404 extends to the inside of the sensor 403, selects a torque module of the prior art as the sensor 403, and refers to the prior art to enable the sensor 403 to effectively and accurately detect the torque of the rotating block;

[0049] In the case of embodiment two, the staff installs the controller of the prior art on the workbench 1, and electrically connects the controller with the first electric motor 201, the second electric motor 303 and the sensor 403, to ensure normal signal transmission;

[0050] The staff starts the first electric motor 201, the driving shaft of which drives the bidirectional threaded rod 202 to rotate, since the bidirectional threaded rod 202 passes through the threaded holes with opposite screw directions at the bottom of the two holding plates 203, the bidirectional threaded rod 202 rotates to control the two holding plates 203 to move synchronously and reversely, the crystallizer copper pipe 5 is placed between the two holding plates 203, the first electric motor 201 is continuously controlled to make the two holding plates 203 approach each other, until the crystallizer copper pipe 5 is clamped, to ensure that the measuring position of the crystallizer copper pipe 5 is stable;

[0051] The staff adjusts the positions of the first positioning frame 301 and the second positioning frame 302, so that the two conveying wheels 304 clamp the extension pipe 401 under the action of the supporting spring, and the second electric motor 303 is started, and the driving shaft of the second electric motor 303 drives the conveying wheels 304 connected thereto to rotate. When the conveying wheels 304 rotate, the extension pipe 401 is controlled to automatically move laterally, so that the third positioning frame 402, the sensor 403, the positioning plate 404 and the roller enter the inside of the crystallizer copper pipe 5;

[0052] The torsional spring supports the roller on the positioning plate 404 to flexibly contact the inner wall of the crystallizer copper pipe 5, and the extension pipe 401 drives the third positioning frame 402, the sensor 403, the positioning plate 404 and the roller to move synchronously in the moving process. The roller moves up and down along the curvature of the inner wall of the crystallizer copper pipe 5 in the moving process, at this time, the rotating block of the positioning plate 404 generates a torque change, the sensor 403 receives the torque of the rotating block of the positioning plate 404 and transmits it to the prior art calculation module electrically connected thereto;

[0053] The calculation module measures the curvature of the crystallizer copper pipe 5 according to the moving amplitude of the roller and the torque of the rotating block, and displays the measurement result;

[0054] After the curvature measurement of the crystallizer copper pipe 5 is completed, the first electric motor 201 and the second electric motor 303 are turned off, the first electric motor 201 is controlled to reverse, the two clamping plates 203 are controlled to move reversely, the crystallizer copper pipe 5 is loosened, and the crystallizer copper pipe 5 is taken out;

[0055] The parameters such as the clamping force of the crystallizer copper pipe 5, the conveying speed of the extension pipe 401 and the measurement stroke are set in the controller, after the setting is completed, the controller is started, and the controller automatically controls the operation of the first electric motor 201, the second electric motor 303 and the sensor 403;

[0056] The controller controls the first electric motor 201 according to the preset parameters, so that the bidirectional screw rod 202 rotates, drives the two clamping plates 203 to move reversely synchronously, automatically clamps the crystallizer copper pipe 5, and controls the second electric motor 303 to rotate, so that the conveying wheel 304 rotates and automatically conveys the extension pipe 401 into the inside of the crystallizer copper pipe 5;

[0057] The extension pipe 401 drives the third positioning frame 402, the sensor 403, the positioning plate 404 and the roller to move in the crystallizer copper pipe 5, the sensor 403 collects the torque data of the rotating block of the positioning plate 404 in real time, and transmits the torque data to the controller.

[0058] In this paper, the following points need to be noted:

[0059] 1. The drawings of the embodiments of the present disclosure only relate to the structures involved in the embodiments of the present disclosure, and other structures can refer to the general design.

[0060] 2. Embodiments and features of embodiments of the present disclosure can be combined if not mutually exclusive to result in new embodiments.

[0061] The above merely provides the specific implementation of the present disclosure, but the protection scope of the present disclosure is not limited thereto, and any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present disclosure, which should be covered within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.

Claims

1. A crystallizer copper tube camber measuring device comprising: The workbench (1), conveying mechanism (3) and measuring mechanism (4), the middle position of the workbench (1) is provided with a set of clamping mechanism (2), characterized in that the clamping mechanism (2) is composed of a first electric motor (201), a bidirectional threaded rod (202) and a holding plate (203), the upper position of the workbench (1) is provided with a set of conveying mechanism (3) and a set of measuring mechanism (4), the conveying mechanism (3) is composed of a first positioning frame (301), a second positioning frame (302), a second electric motor (303) and a conveying wheel (304), the holding plate (203) has two, a crystallizer copper pipe (5) is installed between the two holding plates (203), a threaded hole is formed in the bottom position of each of the two holding plates (203), the screw directions of the two threaded holes are opposite, the bidirectional threaded rod (202) passes through the inside of the threaded hole, and the measuring mechanism (4) is composed of an extension pipe (401), a third positioning frame (402), a sensor (403) and a positioning plate (404).

2. The crystallizer copper pipe arc measurement device according to claim 1, characterized in that, two sliding holes are formed in the middle position of the workbench (1), the sliding holes are rectangular structures, two sliding grooves are formed in the bottom position of the holding plate (203), and the sliding groove position of the holding plate (203) is engaged with the sliding hole.

3. The crystallizer copper pipe arc measurement device according to claim 1, characterized in that, a rotating hole is formed in the bottom position of the workbench (1), the bidirectional threaded rod (202) passes through the inside of the rotating hole, a positioning groove is formed in the middle position of the bidirectional threaded rod (202), the positioning groove is a circular ring structure, a positioning bolt is installed in the bottom position of the workbench (1), the upper position of the positioning bolt extends into the inside of the positioning groove, and the driving shaft of the first electric motor (201) is connected to one side of the bidirectional threaded rod (202).

4. The crystallizer copper pipe arc measurement device according to claim 1, characterized in that, a stable plate with a threaded hole is arranged on one side of the workbench (1), and a first electric motor (201) is installed on the outside position of the stable plate.

5. The crystallizer copper pipe arc measurement device according to claim 1, characterized in that, two stable plates are arranged on one side of the workbench (1) at the upper position, two sliding holes are formed in the middle position of the stable plates, the sliding holes are cylindrical structures, two positioning rods are arranged on one side of the first positioning frame (301) and the second positioning frame (302) respectively, the positioning rods pass through the inside of the sliding holes and are provided with a supporting spring and a clamping spring on the outside.

6. The crystallizer copper pipe arc measurement device according to claim 1, characterized in that, The inner side position of the first positioning frame (301) is provided with a second electric motor (303), and the workers need to install bolts between the second electric motor (303) and the first positioning frame (301). The bottom positions of the first positioning frame (301) and the second positioning frame (302) are respectively provided with a rotatingly connected conveying wheel (304). The conveying wheels (304) are two in total. The center position of one of the conveying wheels (304) is connected with the driving shaft of the second electric motor (303).

7. The device for measuring the curvature of a copper tube of a crystallizer according to claim 1, characterized in that, One side of the extension pipe (401) is provided with a third positioning frame (402). A group of rotating holes are formed in the two sides of the third positioning frame (402). The positioning plates (404) are two in total. Two rotating blocks are arranged on one side of the positioning plates (404). The rotating blocks pass through the inner sides of the rotating holes. A group of torsional springs are arranged between the rotating blocks and the third positioning frame (402), so that the two positioning plates (404) are automatically in the shape of an eight character. A roller is arranged on one side of the positioning plate (404). A sensor (403) is arranged on the outer side of the third positioning frame (402) through cooperation of a screw. The rotating blocks of the positioning plate (404) extend to the inner side of the sensor (403).

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