An ultrasonic flow meter

Abstract

The application discloses an ultrasonic flowmeter and relates to the technical field of intelligent sensors, which comprises a sensor module and a thin pipe fixing assembly. A rocker arm is rotatably installed outside the sensor module and has a hollow "convex" structure. The thin pipe fixing assembly is arranged at one end of the rocker arm. The thin pipe fixing assembly comprises a flange which is symmetrically fixed to the outer side of the end of the rocker arm. A sliding groove is formed in the flange along the length direction. A ratchet is fixed to one side of the groove bottom, and a clamping plate is slidably arranged on the other side of the groove bottom. The clamping plates on both sides have a "L" shape structure with notches opposite to each other. During use, the sensor module is externally provided with a rocker arm. The thin pipe fixing assembly for V method installation of the thin pipe and the thick pipe fixing assembly for Z method installation of the thick pipe are respectively arranged at both ends of the rocker arm. Therefore, the user can conveniently switch between two different installation methods by turning over the rocker arm according to the actual application diameter of the pipeline.

Description

An ultrasonic flow meter Technical Field

[0001] This invention relates to the field of intelligent sensor technology, specifically to an ultrasonic flow meter. Background Technology

[0002] Previously, ultrasonic flow meters were known to measure the flow rate of fluids flowing in pipes using ultrasonic waves. In these ultrasonic flow meters, ultrasonic waves are transmitted and received between a piezoelectric element located upstream of the pipe and a piezoelectric element located downstream of the pipe, and the flow rate of the fluid flowing in the pipe is measured based on their propagation time difference. This type of flow meter is a smart sensor.

[0003] Existing clamp-on ultrasonic flow meters require measuring the pipe's outer circumference and converting it to pipe diameter before installation. The wall thickness, fluid type, and selected installation method must be input into the host to generate the M25 parameter, which is the installation distance between the two sensors. For small-diameter pipe measurements, the V-method installation is usually suitable, where the two sensors are horizontally aligned and installed on the same side of the pipe. For large-diameter pipe measurements, the Z-method installation is usually suitable, where the two sensors are symmetrically distributed on both sides of the pipe axis. Therefore, when measuring pipes with large diameter spans, it is often necessary to select pipe clamps of the appropriate specifications to fix the sensor modules. This results in non-universal accessories, requiring users to carry different specifications of installation clamps according to the pipe diameter and to perform multiple measurements and positioning, making the operation cumbersome. Summary of the Invention

[0004] The purpose of this invention is to provide an ultrasonic flow meter to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an ultrasonic flow meter, comprising a sensor module and a thin tube fixing assembly, wherein a rocker arm is rotatably mounted on the outside of the sensor module, and the rocker arm has an internally hollowed-out "convex" structure; the thin tube fixing assembly is disposed at one end of the rocker arm, and the thin tube fixing assembly includes a flange, the flange being symmetrically fixed to the outer side of the rocker arm end, and a groove being formed inside the flange along the length direction; a ratchet is fixed on one side of the bottom of the groove, and a clamping plate is slidably mounted on the other side of the bottom of the groove; the two clamping plates have an "L" shaped structure with opposite concave openings, and the arc-shaped concave opening on the inner side of the clamping plate fits against the outer wall of the thin tube; a torsion spring rod is fixed to the side wall of the clamping plate, and a pawl is rotatably connected to the torsion spring rod, and the pawl engages unidirectionally with the teeth of the ratchet arranged along the length direction.

[0006] Furthermore, the rocker arm has a shaft hole in the middle and a bayonet at the other end, and the bayonet has a convex shape with the opening on one side.

[0007] Furthermore, a thick tube fixing assembly is provided at the other end of the rocker arm. The thick tube fixing assembly includes an end cap, a spool, and a stainless steel cable tie. The spool is rotatably mounted on the bottom of the end cap via a bearing, and a stainless steel cable tie is wound around the outside of the spool.

[0008] Furthermore, the thick tube fixing assembly also includes scale markings and an end cap. The stainless steel cable tie has scale markings at equal intervals along its length, and the end cap is fixedly connected to the end of the stainless steel cable tie.

[0009] Furthermore, the coarse tube fixing assembly also includes a cotter pin and a bottom cover. The bottom of the spool is fixedly connected to the cotter pin, and the bottom of the spool is provided with a bottom cover, and the outer edge of the bottom cover is fixed to the adjacent rocker arm.

[0010] Furthermore, the thick tube fixing assembly also includes a spiral spring. The spiral spring is coiled inside the bottom cover, and the outer ring of the spiral spring is connected and fixed to the side wall of the bottom cover. The inner ring of the spiral spring is engaged with the spool through a cotter pin.

[0011] Furthermore, the sensor module is symmetrically fixed with trunnions on both sides, and the trunnions are rotatably engaged with the shaft hole in the middle of the rocker arm through damping washers.

[0012] Furthermore, a sealing cover is fastened to the top of the sensor module, and the sealing cover is fixed to the sensor module by fastening screws.

[0013] Furthermore, the sensor module has a connection terminal inside, and a cable is connected to the connection terminal.

[0014] Furthermore, the cable passes through the sensor module via a waterproof connector, and the sensor module is electrically connected to the host unit via the cable.

[0015] This invention provides an ultrasonic flow meter, which has the following beneficial effects;

[0016] In the use of this invention, when adapting to the measurement conditions of thin tubes below DN200, the V-method installation method is selected. The clamps on both sides are firmly clamped to the outer wall of the thin tube to prevent loosening. After completing the installation of a single sensor module, the required installation distance of the other sensor module is obtained by inputting the required parameters into the main body. At this time, the stainless steel cable tie inside the vertically upward spool at the other end of the rocker arm can serve as a distance marker. By pulling out the stainless steel cable tie inside the spool and marking the required installation distance, the installation position of the other sensor module can be determined. There is no need to use additional measuring tools to mark the installation distance between the two sensor modules, making it more convenient to use.

[0017] In the application of this invention, when measuring pipes with a diameter of DN200 or larger, the Z-method installation method is selected. The stainless steel cable tie is pulled out from inside the spool and wrapped around the outer diameter of the pipe. The end of the stainless steel cable tie is then locked into the slot on the side of the rocker arm. On the one hand, during the rotation of the spool, the cotter pin causes the spiral spring inside the bottom cover to coil and store energy, which pulls the stainless steel cable tie closer to the outer wall of the pipe under the action of elasticity, thus securing it. On the other hand, the scale markings on the surface of the stainless steel cable tie along the length direction can measure the outer circumference of the pipe and convert it into the required pipe diameter parameters while securing the pipe, eliminating the need for additional measuring tools to measure the pipe's outer circumference, making it more convenient to use.

[0018] 3. In the use of this invention, a rocker arm is added to the outside of the sensor module, and thin tube fixing components adapted for V-method installation and thick tube fixing components adapted for Z-method installation are respectively assembled at both ends of the rocker arm. This allows users to easily switch between the two different installation methods by flipping the rocker arm according to the actual pipe diameter. Moreover, the two installation methods are not independent. When the thin tube fixing component for V-method installation is selected to install the thin tube, the clamp at one end of the rocker arm clamps the outer diameter of the thin tube through the relative notch, while the spool at the other end of the rocker arm can be used as a spacing marker through the stainless steel cable tie, easily marking the required installation spacing of the other sensor module and achieving quick installation. When installing a coarse pipe using the Z-method installation coarse pipe fixing assembly, the stainless steel cable tie, wrapped around the outer diameter of the coarse pipe, acts as a pipe clamp and is tightened by a spiral spring. Simultaneously, the scale markings on the surface of the stainless steel cable tie acquire the outer circumference information of the coarse pipe, reducing the workload required for data acquisition. The main unit automatically converts the acquired outer circumference information into the outer pipe diameter and, combined with the acquired inner pipe diameter information and fluid type, automatically generates the required installation spacing and recommends the appropriate installation method. This greatly improves assembly efficiency while adapting to the installation needs of pipes with different diameters, realizing the intelligent application of the ultrasonic flow meter in this application and enhancing its applicability. Attached Figure Description

[0019] Figure 1 is a schematic diagram of the overall structure of the device of the present invention;

[0020] Figure 2 is a schematic diagram of the sensor module Z-method installation structure of the device of the present invention;

[0021] Figure 3 is a schematic diagram of the sensor module V-method installation structure of the device of the present invention;

[0022] Figure 4 is a schematic diagram of the split structure of the device of the present invention;

[0023] Figure 5 is a schematic diagram of the coarse tube fixing assembly of the present invention;

[0024] Figure 6 is a schematic diagram of the rocker arm structure of the present invention;

[0025] Figure 7 is a schematic diagram of the thin tube fixing component of the present invention.

[0026] In the diagram: 1. Sensor module; 2. Rocker arm; 3. Thin tube fixing assembly; 301. Flange; 302. Slide groove; 303. Ratchet; 304. Clamping plate; 305. Torsion spring rod; 306. Pawl; 4. Shaft hole; 5. Bayonet; 6. Thick tube fixing assembly; 601. End cap; 602. Borehole; 603. Stainless steel cable tie; 604. Scale marking; 605. End; 606. Cotter pin; 607. Bottom cover; 608. Spiral spring; 7. Trunnion; 8. Damping washer; 9. Sealing cover plate; 10. Fastening screw; 11. Connecting terminal; 12. Cable; 13. Waterproof connector; 14. Main unit. Detailed Implementation

[0027] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0028] Please refer to Figures 6 and 7. This invention provides a technical solution: an ultrasonic flow meter, including a sensor module 1 and a thin tube fixing assembly 3. A rocker arm 2 is rotatably mounted on the outside of the sensor module 1, and the rocker arm 2 has an internally hollowed-out "convex" structure. The thin tube fixing assembly 3 is disposed at one end of the rocker arm 2, and includes a flange 301. The flange 301 is symmetrically fixed to the outer side of the end of the rocker arm 2, and a groove 302 is formed inside the flange 301 along its length. A ratchet 303 is fixed to one side of the bottom of the groove 302. A clamping plate 304 slides on the other side of the bottom of the chute 302. The two clamping plates 304 are in an "L" shape with opposite concave openings. The arc-shaped concave opening on the inner side of the clamping plate 304 fits against the outer wall of the thin tube. A torsion spring rod 305 is fixed on the side wall of the clamping plate 304. A pawl 306 is rotatably connected to the torsion spring rod 305. The pawl 306 and the tooth of the ratchet 303 are engaged in a one-way engagement. A shaft hole 4 is opened in the middle of the rocker arm 2. A bayonet 5 is opened at the other end of the rocker arm 2. The bayonet 5 is in a "convex" shape with the opening on one side.

[0029] The specific operation is as follows: When adapting to the measurement conditions of thin tubes below DN200, the V-method installation method is selected. This requires that the two sensor modules 1 be horizontally aligned and installed on the same side of the pipe. In use, the rocker arm 2 is turned so that it rotates 90 degrees through the trunnions 7 on both sides of the sensor module 1 via the central shaft hole 4. At this time, the rocker arm 2 is perpendicular to the axis of the thin tube, and the notches of the clamping plates 304 on both sides of the end of the rocker arm 2 are aligned with the outer edge of the thin tube. The user presses the clamping plates 304 inward so that the arc-shaped notches on the inner side fit against the outer wall of the thin tube. During this time, the clamping plates 304 slide within the sliding groove 302 inside the flange 301, while their side walls are rotated by the pawl 306 and ratchet 303 of the torsion spring rod 305. The toothed unidirectional meshing along the length direction serves to prevent backflow, allowing the two side clamps 304 to be firmly clamped to the outer wall of the thin tube to prevent loosening. After completing the installation of a single sensor module 1, the required parameters are input into the main body 14 to obtain the required installation distance of another sensor module 1. At this time, the stainless steel cable tie 603 in the vertically upward-facing spool 602 at the other end of the rocker arm 2 can serve as a distance marker. By pulling out the stainless steel cable tie 603 located in the spool 602 and marking the required installation distance, the installation position of the other sensor module 1 can be determined. There is no need to use additional measuring tools to mark the installation distance of the two sensor modules 1, making it more convenient to use.

[0030] Please refer to Figures 4 and 5. The other end of the rocker arm 2 is provided with a thick tube fixing assembly 6. The thick tube fixing assembly 6 includes an end cap 601, a spool 602, and a stainless steel cable tie 603. The spool 602 is rotatably mounted on the bottom of the end cap 601 via a bearing, and the stainless steel cable tie 603 is wound around the outside of the spool 602. The thick tube fixing assembly 6 also includes scale markings 604 and an end cap 605. The stainless steel cable tie 603 has scale markings 604 evenly spaced along its length, and an end cap is fixedly connected to the end of the stainless steel cable tie 603. 605, the coarse tube fixing assembly 6 also includes a cotter pin 606 and a bottom cover 607. The bottom of the spool 602 is fixedly connected to the cotter pin 606, and the bottom of the spool 602 is provided with the bottom cover 607. The outer edge of the bottom cover 607 is fixed to the adjacent rocker arm 2. The coarse tube fixing assembly 6 also includes a spiral spring 608. The spiral spring 608 is coiled inside the bottom cover 607. The outer ring of the spiral spring 608 is connected and fixed to the side wall of the bottom cover 607, and the inner ring of the spiral spring 608 is engaged with the spool 602 through the cotter pin 606.

[0031] The specific operation is as follows: When adapting to the measurement conditions of thick pipes with a diameter of DN200 or larger, the Z-method installation method is selected. This requires that the two sensor modules 1 be symmetrically distributed on both sides of the pipe axis. In use, turn the rocker arm 2 and rotate it 90 degrees to reset it. At this time, the rocker arm 2 is parallel to the axis of the thick pipe, and the axis of the spool 602 at the end of the rocker arm 2 is parallel to the axis of the thick pipe. The user pulls out the stainless steel cable tie 603 inside the spool 602 and wraps it around the outer diameter of the thick pipe once. Then, the end 605 of the stainless steel cable tie 603 is inserted into the slot 5 on the side of the rocker arm 2. Locking has two aspects. On the one hand, during the rotation of the spool 602, the cotter pin 606 causes the spiral spring 608 inside the bottom cover 607 to coil and store energy, so that the pulled-out stainless steel cable tie 603 is pulled close to the outer wall of the thick pipe under the action of elasticity to achieve fastening. On the other hand, the scale markings 604 set along the length direction on the surface of the stainless steel cable tie 603 can measure the outer circumference of the thick pipe and convert it into the required pipe diameter parameters while fastening the thick pipe, without the need to use additional measuring tools to measure the outer circumference of the pipe, making it more convenient to use.

[0032] Please refer to Figures 1 to 3. The sensor module 1 is symmetrically fixed with trunnions 7 on both sides, and the trunnions 7 are rotatably engaged with the shaft hole 4 in the middle of the rocker arm 2 through the damping pad 8. The top of the sensor module 1 is fastened with a sealing cover plate 9, and the sealing cover plate 9 is fixed to the sensor module 1 by a fastening screw 10. The sensor module 1 is provided with a connection terminal 11, and a cable 12 is connected to the connection terminal 11. The cable 12 passes through the outside of the sensor module 1 through a waterproof connector 13, and the sensor module 1 is electrically connected to the main body 14 through the cable 12.

[0033] The specific operation is as follows: This application adds a rocker arm 2 to the outside of the sensor module 1, and equips the two ends of the rocker arm 2 with a thin tube fixing component 3 adapted for the V-method installation of thin tubes and a thick tube fixing component 6 adapted for the Z-method installation of thick tubes, respectively. This allows the user to switch between the two different installation methods by flipping the rocker arm 2 according to the actual pipe diameter. Moreover, the two installation methods are not independent. When the thin tube fixing component 3 for the V-method installation is selected to install the thin tube, the clamping plate 304 at one end of the rocker arm 2 clamps the outer diameter of the thin tube through the relative notch, while the spool 602 at the other end of the rocker arm 2 can... The stainless steel cable tie 603 serves as a spacing marker, easily indicating the required installation spacing of another sensor module 1 for quick installation. When using the Z-method installation coarse pipe fixing assembly 6 to install the coarse pipe, the stainless steel cable tie 603, when wrapped around the outer diameter of the coarse pipe, acts as a pipe clamp and is tightened by the spiral spring 608. At the same time as tightening, the scale markings 604 on the surface of the stainless steel cable tie 603 can simultaneously obtain the outer circumference information of the coarse pipe, reducing the workload required to obtain data, greatly improving assembly efficiency, and adapting to the installation needs of pipes with different diameters, making it more versatile.

[0034] It should be noted that the host body 14 of this application uses the Baikong Sensing FM800H clamp-on ultrasonic flow meter and two sensor modules 1 that are adapted to it.

[0035] In summary, when using this ultrasonic flow meter:

[0036] Firstly, when adapting to the measurement of thin tubes below DN200, the V-method installation method is selected. This requires that the two sensor modules 1 be horizontally aligned and installed on the same side of the pipe. In use, the rocker arm 2 is turned so that it rotates 90 degrees through the trunnions 7 on both sides of the sensor module 1 via the central shaft hole 4. At this time, the rocker arm 2 is perpendicular to the axis of the thin tube, and the notches on the clamping plates 304 at both ends of the rocker arm 2 are aligned with the outer edge of the thin tube. The user presses the clamping plates 304 inward so that the arc-shaped notches on the inner side fit against the outer wall of the thin tube. During this process, the clamping plates 304 slide within the guide groove 302 inside the flange 301, while their side walls are rotated by the pawl 306 and ratchet 303 of the torsion spring rod 305. The toothed unidirectional meshing with directional settings serves to prevent backflow, allowing the two side clamps 304 to be firmly clamped to the outer wall of the thin tube to prevent loosening. After completing the installation of a single sensor module 1, the required installation distance of another sensor module 1 is obtained by inputting the required parameters into the main body 14. At this time, the stainless steel cable tie 603 in the vertically upward-facing spool 602 at the other end of the rocker arm 2 can serve as a distance marker. By pulling out the stainless steel cable tie 603 located in the spool 602 and marking the required installation distance, the installation position of the other sensor module 1 can be determined. There is no need to use additional measuring tools to mark the installation distance of the two sensor modules 1, making it more convenient to use.

[0037] Secondly, when adapting to the measurement conditions of pipes with diameters of DN200 and above, the Z-method installation method is selected. This requires that the two sensor modules 1 be symmetrically distributed on both sides of the pipe axis. In use, the rocker arm 2 is turned and rotated 90 degrees to return to its original position. At this time, the rocker arm 2 is parallel to the axis of the pipe, and the axis of the spool 602 at the end of the rocker arm 2 is parallel to the axis of the pipe. The user pulls out the stainless steel cable tie 603 inside the spool 602 and wraps it around the outer diameter of the pipe. The end 605 of the stainless steel cable tie 603 is then locked into the slot 5 on the side of the rocker arm 2. On the one hand, during the rotation of the spool 602, the cotter pin 606 causes the spiral spring 608 inside the bottom cover 607 to coil and store energy, so that the pulled-out stainless steel cable tie 603 is pulled close to the outer wall of the thick pipe under the action of elasticity to achieve fastening. On the other hand, the scale markings 604 set along the length direction on the surface of the stainless steel cable tie 603 can measure the outer circumference of the thick pipe and convert it into the required pipe diameter parameters while fastening the thick pipe, without the need to use additional measuring tools to measure the outer circumference of the pipe, making it more convenient to use.

[0038] Finally, this application adds a rocker arm 2 to the outside of the sensor module 1, and equips the two ends of the rocker arm 2 with a thin tube fixing component 3 adapted for the V-method installation of thin tubes and a thick tube fixing component 6 adapted for the Z-method installation of thick tubes, respectively. This allows the user to switch between the two different installation methods by flipping the rocker arm 2 according to the actual pipe diameter. Moreover, the two installation methods are not independent. When the thin tube fixing component 3 for the V-method installation is selected to install the thin tube, the clamping plate 304 at one end of the rocker arm 2 clamps the outer diameter of the thin tube through the relative notch, while the spool 602 at the other end of the rocker arm 2 can be connected to the stainless steel pipe. The steel cable tie 603 serves as a spacing marker, easily indicating the required installation spacing of another sensor module 1 for quick installation. When using the Z-method installation coarse pipe fixing assembly 6 to install the coarse pipe, the stainless steel cable tie 603, when wrapped around the outer diameter of the coarse pipe, acts as a pipe clamp and is tightened by the spiral spring 608. At the same time as tightening, the scale markings 604 on the surface of the stainless steel cable tie 603 can simultaneously obtain the outer circumference information of the coarse pipe, reducing the workload required to obtain data, greatly improving assembly efficiency, and adapting to the installation needs of pipes with different diameters, making it more versatile.

[0039] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0040] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only for the purpose of helping to understand the method and core ideas of the present invention. The above descriptions are only preferred embodiments of the present invention. It should be noted that due to the limitations of textual expression, while there are objectively infinite specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of the present invention.

Claims

1. An ultrasonic flow meter, comprising a sensor module (1) and a thin tube fixing assembly (3), characterized in that, The sensor module (1) is externally mounted with a rocker arm (2), and the rocker arm (2) has an internally hollowed-out "convex" structure. The thin tube fixing assembly (3) is located at one end of the rocker arm (2). The thin tube fixing assembly (3) includes a flange (301), which is symmetrically fixed to the outer side of the end of the rocker arm (2). The flange (301) has a groove (302) inside along the length direction. A ratchet (303) is fixed on one side of the bottom of the groove (302), and a clamping plate (304) slides on the other side of the bottom of the groove (302). The clamping plates on both sides... (304) has an "L"-shaped structure with opposing notches, and the arc-shaped notch on the inner side of the clamp (304) fits against the outer wall of the thin tube. A torsion spring rod (305) is fixed to the side wall of the clamp (304), and a pawl (306) is rotatably connected to the torsion spring rod (305). The pawl (306) and the teeth of the ratchet (303) are engaged in a one-way engagement along the length direction. A thick tube fixing assembly (6) is provided at the other end of the rocker arm (2). The thick tube fixing assembly (6) includes an end cap (601), a spool (602), and a stainless steel cable tie (603). The end cap (601) 1) A bobbin (602) is rotatably mounted at the bottom via a bearing, and a stainless steel cable tie (603) is wound around the outside of the bobbin (602). The thick tube fixing assembly (6) also includes a scale mark (604) and an end (605). The stainless steel cable tie (603) has scale marks (604) evenly spaced along its length, and an end (605) is fixedly connected to the end of the stainless steel cable tie (603). The thick tube fixing assembly (6) also includes a cotter pin (606) and a bottom cover (607). The bottom of the bobbin (602) is fixedly connected to the cotter pin (606). The bottom of the spool (602) is provided with a bottom cover (607), and the outer edge of the bottom cover (607) is fixed to the adjacent rocker arm (2). The thick tube fixing assembly (6) also includes a spiral spring (608). The spiral spring (608) is coiled inside the bottom cover (607), and the outer ring of the spiral spring (608) is connected and fixed to the side wall of the bottom cover (607). The inner ring of the spiral spring (608) is engaged with the spool (602) through a cotter pin (606). The rocker arm (2) has a shaft hole (4) in the middle and a bayonet (5) at the other end.

2. The ultrasonic flow meter according to claim 1, characterized in that, The bayonet (5) has a convex shape with the opening on one side.

3. An ultrasonic flow meter according to claim 1, characterized in that, The sensor module (1) has trunnions (7) fixed symmetrically on both sides, and the trunnions (7) are rotated and engaged with the shaft hole (4) in the middle of the rocker arm (2) through the damping pad (8).

4. An ultrasonic flow meter according to claim 1, characterized in that, The sensor module (1) is fitted with a sealing cover plate (9) on top, and the sealing cover plate (9) is fixed to the sensor module (1) by a fastening screw (10).

5. An ultrasonic flow meter according to claim 1, characterized in that, The sensor module (1) has a connection terminal (11) inside, and a cable (12) is connected to the connection terminal (11).

6. An ultrasonic flow meter according to claim 5, characterized in that, The cable (12) passes through the sensor module (1) through the waterproof connector (13), and the sensor module (1) is electrically connected to the host body (14) through the cable (12).

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