CN114256599B - Two-way locomotive signal receiving antenna with two induction coil structures - Google Patents
Two-way locomotive signal receiving antenna with two induction coil structures Download PDFInfo
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- CN114256599B CN114256599B CN202111680298.1A CN202111680298A CN114256599B CN 114256599 B CN114256599 B CN 114256599B CN 202111680298 A CN202111680298 A CN 202111680298A CN 114256599 B CN114256599 B CN 114256599B
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- 230000006698 induction Effects 0.000 title claims abstract description 25
- 230000003137 locomotive effect Effects 0.000 title claims abstract description 16
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 66
- 230000004044 response Effects 0.000 claims abstract description 51
- 238000012360 testing method Methods 0.000 claims abstract description 24
- 238000013461 design Methods 0.000 claims abstract description 22
- 229910052742 iron Inorganic materials 0.000 claims abstract description 21
- 239000004033 plastic Substances 0.000 claims abstract description 8
- 229910000976 Electrical steel Inorganic materials 0.000 claims abstract description 7
- 239000000945 filler Substances 0.000 claims abstract description 7
- 239000002131 composite material Substances 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims abstract description 4
- 239000000203 mixture Substances 0.000 claims abstract description 4
- 238000001514 detection method Methods 0.000 claims description 14
- 238000007789 sealing Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 238000011049 filling Methods 0.000 claims description 3
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 230000002159 abnormal effect Effects 0.000 claims description 2
- 230000008859 change Effects 0.000 claims description 2
- 238000012795 verification Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000014509 gene expression Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/27—Adaptation for use in or on movable bodies
- H01Q1/32—Adaptation for use in or on road or rail vehicles
- H01Q1/325—Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle
- H01Q1/3291—Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle mounted in or on other locations inside the vehicle or vehicle body
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
- H01Q7/06—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop with core of ferromagnetic material
- H01Q7/08—Ferrite rod or like elongated core
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Engineering & Computer Science (AREA)
- Remote Sensing (AREA)
- Near-Field Transmission Systems (AREA)
Abstract
The invention relates to a two-way locomotive signal receiving antenna with a two-induction coil structure, which consists of a hoisting rod, a tail cable, an iron clamping head, an iron core, an induction coil assembly, a plastic shell, a filler and a positioning shell, wherein the receiving antenna adopts a frequency response characteristic adjustable design, and the frequency response characteristic of the receiving antenna is changed by adjusting parameters of all parts in the receiving antenna so as to ensure that the frequency response characteristic of the receiving antenna meets expectations; the means for adjusting the frequency response characteristics comprises: adjusting the material composition of the composite iron core and the relative position of the induction coil and the iron core; adjusting the width of an iron chuck; the C-shaped folding lugs made of silicon steel sheets are added on two sides of the iron clamping head. The invention has the technical advantages that: the locomotive signal receiving antenna adopts the design convenient for adjusting the frequency response characteristic, and is matched with the automatic receiving antenna testing system, so that the design of the receiving antenna with the customized frequency response characteristic can be rapidly completed.
Description
Technical Field
The invention relates to the field of locomotive signal control in railway industry, in particular to a double-channel locomotive signal receiving antenna.
Background
The locomotive signal receiving antenna is a key component for receiving the track circuit signals by locomotive signal on-board system equipment and a Track Circuit Reader (TCR), and has a great number of applications in the China railway industry. The receiving antenna is hoisted below the car body and aligned with the center of the steel rail, and the current signal in the steel rail is induced by the electromagnetic induction principle to form an induced voltage signal, and the induced voltage signal is sent to the car-mounted host machine for decoding. At present, a cab signal host and a Track Circuit Reader (TCR) host are mainly in a two-by-two dual-standby architecture, so that a cab signal receiving antenna needs to provide two redundant sensing signals, which correspond to an A/B two-system of a vehicle-mounted host respectively, and hot standby switching can be performed between the two systems.
Along with the continuous expansion of application scenes, different requirements are also put forward on the frequency response characteristics of the locomotive signal receiving antenna so as to better configure various complex scenes and ensure the reliable receiving of signals.
Disclosure of Invention
In view of the above-mentioned needs, the present invention provides a dual-channel receiver antenna with two induction coils.
The invention provides a double-channel locomotive signal receiving antenna with a two-induction coil structure, which consists of a hoisting rod, a tail cable, an iron clamping head, an iron core, an induction coil assembly, a plastic shell, a filler and a positioning shell,
The induction coil component is wound on the framework by enameled wires according to a certain number of turns, and then fixed on an iron core sleeved with a positioning shell at a certain interval, and iron chucks are arranged at two ends of the iron core to play a role in fixing the iron core and the lifting rod;
The lead wire of the induction coil assembly is connected to the tail cable to serve as an external signal interface of the receiving antenna, and then the tail cable is placed into a plastic shell, and filling, sealing and sealing are carried out by using a filler;
The receiving antenna adopts a design with adjustable frequency response characteristics, and the parameters of all components in the receiving antenna are adjusted to change the frequency response characteristics of the receiving antenna so that the frequency response characteristics of the receiving antenna meet the expectations;
The means for adjusting the frequency response characteristics comprises: adjusting the material composition of the composite iron core and the relative position of the induction coil and the iron core; adjusting the width of an iron chuck; the C-shaped folding lugs made of silicon steel sheets are added on two sides of the iron clamping head.
The invention has the technical advantages that:
The locomotive signal receiving antenna adopts the design convenient for adjusting the frequency response characteristic, and is matched with the automatic receiving antenna test system invented by the Ministry of China, so that the design of the receiving antenna with customized frequency response characteristic can be rapidly completed.
In addition, the invention proposes to add a design for detecting the coil faults in the receiving antenna so as to improve the accuracy of coil fault detection.
Drawings
FIG. 1 is a schematic diagram of a dual-channel receiver antenna according to the present invention
Fig. 2 is a schematic diagram showing the connection of the two induction coil structure receiving antennas according to the present invention
Fig. 3 is a flow chart of a receiver antenna customized tuning of frequency response characteristics
FIG. 4 is a top view cross section of a "C" shaped hinge
FIG. 5 is a schematic diagram of a receiving antenna application connection with an additional detection coil
Fig. 6 is a schematic diagram of a receiving antenna misconnection-single-edge connection
Reference numeral 1-lifting rod, 2-tail cable, 3-iron clamp, 4-iron core, 5-induction coil assembly, 6-plastic shell, 7-filler and 8-positioning shell
Detailed Description
The features and advantages of the present invention will be described in detail below with reference to the following examples. The content of which will assist the person skilled in the art to further understand the invention, but does not limit it in any way. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the scope of the invention.
The two-way cab signal receiving antenna of the invention is a key component of cab signal on-board system equipment and a Track Circuit Reader (TCR). The device consists of a hoisting rod 1, a tail cable 2, an iron clamping head 3, an iron core 4, an induction coil assembly 5, a plastic shell 6, a filler 7, a positioning shell 8 and the like, and is shown in figure 1. The induction coil assembly 5 is wound on the framework by enameled wires according to a certain number of turns, then fixed on the iron core 4 sleeved with the positioning shell 8 according to a certain interval, iron chucks 3 are arranged at two ends of the iron core 4, and the effects of fixing the iron core 4 and lifting the rod 1 are achieved. The lead wire of the induction coil assembly 5 is connected to the tail cable 2 as a receiving antenna interface for external signals. Then the plastic shell 6 is filled, and the filling 7 is used for sealing and sealing.
The receiving antenna can be matched with a receiving antenna frequency response characteristic automatic test system designed by the company of the Magnomono, and the receiving antenna with specific frequency response characteristic can be custom designed, and can also be matched with a locomotive signal host or a Track Circuit Reader (TCR) host to complete the function of self-checking the receiving antenna.
The two-way locomotive signal receiving antenna adopts a design with adjustable frequency response characteristics. The adjustable components include a core 4, a ferrous chuck 3, and the relative positions of the core 4 and the induction coil assembly 5. The iron core is made of composite material and consists of silicon steel sheet, iron sheet, non-magnetic medium matter (such as wood sheet and rubber sheet) and the like in a certain proportion. The composite iron core is arranged in the positioning shell 8, positioning grooves are arranged at the outer side of the shell at certain intervals, and telescopic positioning tooth heads are designed on the inner wall of the framework of the induction coil assembly 5 and can be clamped into the positioning grooves.
The automatic test system of the receiving antenna designed by the company of Confucius is needed to be matched for customizing and adjusting the frequency response characteristics of the receiving antenna of the two-way locomotive signal (the invention of the automatic test system is applied for the same day as the invention), and the test system is based on a phase-locked amplification technology and an automatic control technology and has the advantages of high test efficiency and high test precision. In addition, aiming at the design with adjustable frequency response characteristics of the receiving antenna, the automatic test system can intelligently recommend an optimal design model by combining an experience database, so that the double-path receiving antenna designed by the invention can quickly complete iteration and verification by means of the test system, thereby obtaining the receiving antenna design meeting expected requirements.
The customized adjustment process of the receiving antenna is as follows:
Referring to the flowchart of fig. 3, firstly, an expected frequency response characteristic parameter index needs to be set in a test system, then the automatic test system is used for measuring the frequency response characteristic of the receiving antenna, after the measurement is completed, whether the measured frequency response characteristic index meets an expected target value is judged, and if the measured frequency response characteristic index meets the expected target value, no adjustment is needed, so that the antenna design is completed. If not, the system will continue to give a recommended optimal adjustment scheme based on the measurement. After adjusting the receiving antenna according to the adjustment scheme, repeating the above steps again until the receiving antenna frequency response characteristic converges to the expected target value.
The means for adjusting the frequency response characteristics of the receiving antenna comprises:
1) The material composition of the iron core 4 is adjusted and the relative position of the induction coil assembly 5 and the iron core 4 is adjusted. The silicon steel sheet is added, so that the high-frequency band frequency response characteristic can be improved, and the low-frequency band frequency response characteristic can be restrained. The iron sheet is added, so that the low-frequency band frequency response characteristic can be improved, and the high-frequency band frequency response characteristic can be restrained. The closer the induction coil assembly 5 is to the two ends of the iron core 4, the more the frequency response characteristics of the full frequency band are suppressed, and the closer the induction coil assembly is to the center, the more the frequency response characteristics of the full frequency band are improved.
2) The width of the iron chuck 3 is adjusted. The wider the iron clamp 3 is, the better the low-frequency band response is, and the high-frequency band response is restrained.
3) The two sides of the iron clamping head 3 are added with C-shaped folding lugs made of silicon steel sheets, see figure 4. The method can improve the high-frequency band frequency response characteristic.
The automatic test system is based on the adjusting means, combines historical test data, establishes a target driving type adjusting means database after arrangement, and intelligently recommends an optimal design model (comprising the quantitative adjustable parameters in the current stage) of the receiving antenna in the whole design test process according to the parameter indexes of the expected receiving antenna.
The advantages of the custom design process described above are as follows: the receiving antenna adopts an adjustable design, is convenient to adjust the frequency response characteristic of the receiving antenna by various means, is matched with the automatic testing system for the frequency response characteristic of the receiving antenna invented by the jersey company, can rapidly complete testing, adjusting and verifying, delivers the antenna design meeting the target requirements, and improves the research and development efficiency.
The matching with the cab signal host or the Track Circuit Reader (TCR) host to perform the function of self-checking the receiving antenna means adding a detecting coil in the dual-path receiving antenna, see fig. 5, where the detecting coils are not connected in series left and right, but respectively correspond to the a/B system of the vehicle-mounted host (see fig. 2). The detection coils in the left and right receiving antennas are used as transmitting antennas and are driven by the vehicle-mounted host A/B system to transmit self-checking signals (the self-checking signals are single-frequency signals, the frequency, the amplitude and the like of the self-checking signals are determined by an internal protocol and are not limited to a certain frequency value, 8 single-frequency signals correspond to 8 parallel port lamp positions of a locomotive signal machine), and the two host computers respectively receive signals sensed by the corresponding detection coils and analyze signal characteristics. If the frequency of the single-frequency signal collected by the vehicle-mounted host A system or the vehicle-mounted host B system is consistent with the frequency of the transmission, and the signal amplitude is within a certain range, the receiving antenna can be judged to be normal; otherwise, it is determined that the receiving antenna path is abnormal: when the frequency of the received single-frequency signal is correct and the amplitude is smaller than a certain value, judging that the receiving antenna is short-circuited; when the single frequency signal is not received, the receiving antenna is determined to be open. The vehicle-mounted host A sends a self-checking signal, so that whether the left-side receiving antenna is normal or not can be detected. The vehicle-mounted host B sends a self-checking signal to check whether the right receiving antenna is normal
When the receiving antenna is connected correctly, that is, the left receiving antenna and the right receiving antenna are connected in series, as shown in fig. 5, whether the receiving antenna is normal, short-circuited or open-circuited can be detected in the above manner. If the connection of the receiving antennas is incorrect, that is, the two induction coils in the left receiving antenna are connected in series, and the two induction coils in the right receiving antenna are connected in series, see fig. 6, then when the vehicle-mounted host a or B sends the detection signal, only one system can receive the detection signal, and the other system cannot receive the detection signal. By this method, the problem of the reception antenna connection error (single-side connection of fig. 6) can be detected.
The invention has the technical advantages that:
1) The adjustable design of the receiving antenna can provide the receiving antenna meeting the standard requirement and the customized receiving antenna meeting the specific application scene, improves the applicability of products and saves the cost of redevelopment.
2) The receiving antenna expands the self-checking range and improves the usability of the vehicle-mounted system.
The terms and expressions which have been employed herein are used as terms of description and not of limitation, and there is no intention in the use of such terms and expressions of excluding any equivalents of the features shown and described, and it is recognized that various modifications, alterations, and substitutions are possible, and they are intended to be included within the scope of the claims, which follow.
Claims (8)
1. A double-channel locomotive signal receiving antenna with a two-induction coil structure comprises a hoisting rod, a tail cable, an iron clamping head, an iron core, an induction coil assembly, a plastic shell, a filler and a positioning shell,
The induction coil component is wound on the framework by enameled wires according to a certain number of turns, and then fixed on an iron core sleeved with a positioning shell at a certain interval, and iron chucks are arranged at two ends of the iron core to play a role in fixing the iron core and the lifting rod;
The lead wire of the induction coil assembly is connected to the tail cable to serve as an external signal interface of the receiving antenna, and then the tail cable is placed into a plastic shell, and filling, sealing and sealing are carried out by using a filler;
The receiving antenna adopts a design with adjustable frequency response characteristics, and the parameters of all components in the receiving antenna are adjusted to change the frequency response characteristics of the receiving antenna so that the frequency response characteristics of the receiving antenna meet the expectations;
The means for adjusting the frequency response characteristics comprises: adjusting the material composition of the composite iron core and the relative position of the induction coil and the iron core; adjusting the width of an iron chuck; the C-shaped folding lugs made of silicon steel sheets are added on two sides of the iron clamping head.
2. The receiving antenna of claim 1, wherein the addition of the silicon steel sheet can improve the high-frequency band response characteristic and suppress the low-frequency band response characteristic; the iron sheet is added, so that the low-frequency band frequency response characteristic can be improved, and the high-frequency band frequency response characteristic can be restrained;
The induction coil is closer to the two ends of the iron core to inhibit the frequency response characteristic of the full frequency band, and is closer to the center to improve the frequency response characteristic of the full frequency band;
the wider the iron clamping head is, the better the low-frequency band frequency response characteristic can be improved, and the high-frequency band frequency response characteristic can be restrained;
the folded lug is added, so that the high-frequency band frequency response characteristic can be improved.
3. The receiving antenna according to claim 1, wherein a detection coil is added to the two-way cab signal receiving antenna, and the detection coils are not connected in series left and right but respectively correspond to an a/B system of an on-vehicle host.
4. A receiving antenna according to claim 3, wherein the detecting coils in the left and right receiving antennas are used as transmitting antennas, and are driven by the vehicle-mounted host computer a/B system to transmit self-test signals respectively; the two-system vehicle-mounted host machine respectively receives signals sensed by the corresponding detection coils and analyzes signal characteristics.
5. The receive antenna of claim 4, wherein the antenna detection is performed as a self-test as follows: if the frequency of the signal collected by the vehicle-mounted host A system or B system is consistent with the frequency of the transmitted self-checking signal and the signal amplitude is within a certain range, the receiving antenna can be judged to be normal; otherwise, judging that the receiving antenna path is abnormal;
When the frequency of the received single-frequency signal is correct and the amplitude is smaller than a certain value, judging that the receiving antenna is short-circuited; when the single frequency signal is not received, the receiving antenna is determined to be open.
6. The receiving antenna according to claim 5, wherein the vehicle-mounted host a transmits a self-test signal, so as to detect whether the left receiving antenna is normal; the vehicle-mounted host B sends a self-checking signal, so that whether the right-side receiving antenna is normal or not can be detected.
7. The receiving antenna according to claim 6, wherein the receiving antenna is connected correctly, i.e. when the left receiving antenna and the right receiving antenna are connected in series, whether the two paths of receiving antennas are normal, short-circuited or broken can be detected according to the self-checking mode;
If the connection of the receiving antenna is incorrect, only one system can receive the detection signal when the vehicle-mounted host A system or B system transmits the detection signal, and the other system can not receive the detection signal, so that the single-side connection error of the receiving antenna can be detected.
8. The receiving antenna of claim 1, wherein the receiving antenna is capable of rapidly performing iterations and verifications by means of an automatic frequency response characteristic test system to obtain a receiving antenna design meeting expected requirements;
The automatic frequency response characteristic test system is based on the adjustable means of the receiving antenna, combines historical test data, establishes a target driving type adjustment means database after arrangement, and intelligently recommends an optimal design model of the receiving antenna in the whole design test process according to the expected parameter index of the receiving antenna;
the optimal design model comprises the quantitative adjustable parameters of the receiving antenna in the current stage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111680298.1A CN114256599B (en) | 2021-12-30 | 2021-12-30 | Two-way locomotive signal receiving antenna with two induction coil structures |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111680298.1A CN114256599B (en) | 2021-12-30 | 2021-12-30 | Two-way locomotive signal receiving antenna with two induction coil structures |
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| Publication Number | Publication Date |
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| CN114256599A CN114256599A (en) | 2022-03-29 |
| CN114256599B true CN114256599B (en) | 2024-07-12 |
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| CN202111680298.1A Active CN114256599B (en) | 2021-12-30 | 2021-12-30 | Two-way locomotive signal receiving antenna with two induction coil structures |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2685575A1 (en) * | 2009-12-08 | 2011-06-08 | Brian N. Southon | Vital wayside train detection system |
| CN104284282A (en) * | 2014-11-03 | 2015-01-14 | 常州阿木奇声学科技有限公司 | Magnetic driving mechanism improving low-frequency performance and high-frequency performance of balanced armature unit |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2877060Y (en) * | 2006-09-27 | 2007-03-07 | 哈尔滨市科佳通用机电有限公司 | Signal double-channel receiving coil for railway locomotive |
| CN203351738U (en) * | 2013-08-09 | 2013-12-18 | 哈尔滨市科佳通用机电有限公司 | Railway locomotive signal dual-channel receiving coil |
| CN203981806U (en) * | 2014-07-25 | 2014-12-03 | 济南三鼎电气有限责任公司 | Cab signal proving installation |
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2021
- 2021-12-30 CN CN202111680298.1A patent/CN114256599B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2685575A1 (en) * | 2009-12-08 | 2011-06-08 | Brian N. Southon | Vital wayside train detection system |
| CN104284282A (en) * | 2014-11-03 | 2015-01-14 | 常州阿木奇声学科技有限公司 | Magnetic driving mechanism improving low-frequency performance and high-frequency performance of balanced armature unit |
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| CN114256599A (en) | 2022-03-29 |
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