Fuse resistance test equipment

Abstract

The utility model discloses a fuse resistance test device which comprises a transmission device and a test device. The transmission device comprises two conveyor belt mechanisms which are arranged side by side at an interval, the two conveyor belt mechanisms rotate synchronously, and the distance between the two conveyor belt mechanisms is adjustable; a fuse to be tested is erected and transmitted between the two conveyor belt mechanisms, and two ends of the fuse are respectively erected on the two conveyor belt mechanisms; the testing device comprises two testing assemblies, the two testing assemblies are arranged side by side in a spaced mode and correspond to the two conveying belt mechanisms respectively, each testing assembly is provided with two testing needles capable of ascending and descending, and the two testing needles are located above the corresponding conveying belt mechanisms; the two test assemblies are provided with four test pins and are used for realizing four-terminal resistance measurement. Therefore, the accurate fuse resistance can be tested, and the measurement accuracy is not affected. And the distance between the conveying belt mechanisms is adjustable, so that the practicability of the testing equipment can be greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of fuses, in particular to a fuse resistance testing device. Background Art

[0002] Fuses are electrical components installed in circuits to ensure safe operation of circuits. When a circuit fails or is abnormal, the current continues to rise, which may damage the electrical components in the circuit. If the fuse is correctly installed in the circuit, the fuse will melt and cut off the current when the current abnormally rises to a certain height, thereby protecting the safe operation of the circuit.

[0003] In order to ensure that the fuse tube is qualified before leaving the factory, the fuse is generally tested before leaving the factory to ensure that the resistance value of the fuse is within the range; the existing fuse test usually uses two test needles, which are respectively set at the two ends of the fuse flowing on the assembly line to test the resistance; however, the position of the fuse on the assembly line is easy to change during the transportation process, which will cause the contact point between the test needle and the two ends of the fuse to change, and ultimately lead to inaccurate testing. Utility Model Content

[0004] The utility model aims to provide a fuse resistance testing device, which has the advantages of ensuring test accuracy and improving the practicability of the testing device.

[0005] In order to achieve the above purpose, the solution of the utility model is:

[0006] A fuse resistance testing device comprises a transmission device and a testing device;

[0007] The transmission device comprises two conveyor belt mechanisms arranged side by side and at an interval, the two conveyor belt mechanisms rotate synchronously, and the interval between the two conveyor belt mechanisms is adjustable;

[0008] The two conveyor belt mechanisms are used to set up and transmit the fuse to be tested, and the two ends of the fuse are respectively set up on the two conveyor belt mechanisms;

[0009] The testing device includes two testing components, which are also arranged side by side and at intervals and correspond to two conveyor belt mechanisms respectively. Each testing component has two liftable testing needles, and the two testing needles are located above the corresponding conveyor belt mechanisms. The two testing components have a total of four testing needles for realizing four-terminal resistance measurement.

[0010] Furthermore, the testing device also includes a sensor and a controller. The sensor is used to identify whether there is a fuse under the test needle. The controller is electrically connected to the sensor, the conveyor belt mechanism and the testing component, and is used to control whether the conveyor belt mechanism is running and whether the test needle is raised or lowered.

[0011] Furthermore, the transmission device also includes a spacing adjustment mechanism and two transmission brackets arranged side by side and at intervals, and the two conveyor belt mechanisms are respectively installed on the opposite inner sides of the two transmission brackets; the spacing adjustment mechanism is used to control the spacing between the two transmission brackets.

[0012] Furthermore, the spacing adjustment mechanism includes a screw mechanism, which includes a screw, a screw slider, two screw mounting seats and a screw driving member. The two screw mounting seats are arranged at intervals, the screw is rotatably passed through the two screw mounting seats, the screw slider is assembled on the screw, and the screw driving member is used to drive the screw to rotate to drive the screw slider to slide back and forth in a straight line; the two transmission brackets are respectively connected and fixed to the screw slider and one of the screw mounting seats.

[0013] Furthermore, the spacing adjustment mechanism also includes two supporting mechanisms, the screw mechanism is arranged at the lower middle part of the transmission bracket, and the two supporting mechanisms are respectively arranged at the lower sides of the screw mechanism; the supporting mechanism includes a supporting seat, a supporting slide rail and a supporting slider, the supporting slide rail is arranged at one side of the support seat, the supporting slider can be slidably assembled on the supporting slide rail, the support seat is connected to the transmission bracket connected to the screw mounting seat, and the supporting slider is connected to the transmission bracket connected to the screw slider.

[0014] Furthermore, the screw drive component is a hand-cranked turntable or a screw drive motor.

[0015] Furthermore, the transmission device also includes a synchronous rotation mechanism; the synchronous rotation mechanism includes a synchronous motor and a synchronous rotating shaft, and the synchronous motor is transmission-connected to the synchronous rotating shaft; the conveyor belt mechanism includes a driving wheel, a driven wheel and a conveyor belt, and the driving wheel and the driven wheel are respectively rotatably installed on the two ends of the transmission bracket, and the conveyor belt is transmission-connected to the driving wheel and the driven wheel; the driving wheels of the two conveyor belt mechanisms are coaxially arranged on the synchronous rotating shaft, and one of the driving wheels is fixedly connected to the synchronous rotating shaft; the other driving wheel and the corresponding transmission bracket can be axially slidably connected to the synchronous rotating shaft, and the other driving wheel rotates synchronously with the synchronous rotating shaft.

[0016] Furthermore, one end of the synchronous shaft is connected to one of the driving wheels by a key; the other end of the synchronous shaft is provided with a long slide groove extending along the axial direction, a synchronous sleeve is provided between the other driving wheel and the synchronous shaft, a short key groove is provided on the inner side of the synchronous sleeve, a short key that slides in conjunction with the long slide groove is installed in the short key groove, and the outer side of the synchronous sleeve is connected to the other driving wheel by a key.

[0017] Furthermore, the test assembly also includes a test bracket and a lifting mechanism, the test bracket is connected to the outer side of the transmission bracket; the lifting mechanism is installed on the inner side of the test bracket and is located above the conveyor belt mechanism; the lifting mechanism includes a lifting drive and a lifting bracket, the lifting drive is fixed to the test bracket, the upper end of the lifting bracket is connected to the driving end of the lower end of the lifting drive, and two test needles are installed side by side below the lifting bracket.

[0018] Furthermore, the lifting bracket includes an upper connecting portion and two symmetrically arranged "L"-shaped lower connecting portions, and a mounting hole for mounting a test pin is vertically penetrated through the horizontal mounting portion of the lower connecting portion.

[0019] After adopting the above technical solution, four test needles that can be lifted and lowered are used. When the fuse is transmitted to the bottom of the test device along with the conveyor belt mechanism, the four test needles are controlled to descend, and two of them are respectively against the two ends of the fuse. The four test needles can be connected to the test circuit, so that the four-terminal resistance measurement method can be realized by using the four test needles, and the accurate fuse resistance can be tested. Even if the fuse is skewed and the contact points of the four test needles change, the measurement accuracy will not be affected. In addition, by setting the transmission device with two conveyor belt mechanisms, a space for placing the fuse is formed between the two, which is more suitable for fuses with a round tube structure; and the distance between the two is adjustable, which can be applied to fuses of different lengths, greatly improving the practicality of the test equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A three-dimensional diagram of an embodiment of the utility model installed on a machine platform;

[0021] Figure 2 It is a three-dimensional diagram of an embodiment of the utility model;

[0022] Figure 3 This is a front view of an embodiment of the utility model;

[0023] Figure 4 It is a left view of an embodiment of the utility model;

[0024] Figure 5 A top view of an embodiment of the utility model;

[0025] Figure 6 It is an exploded view of an embodiment of the utility model;

[0026] Figure 7 This is a three-dimensional diagram of a testing device according to an embodiment of the present utility model.

[0027] Description of reference numerals: test equipment 10, machine 20, fuse 30, connection terminal board 301;

[0028] Transmission device 1, conveyor belt mechanism 11, driving wheel 111, driven wheel 112, conveyor belt 113, spacing adjustment mechanism 12, screw mechanism 121, screw 1211, screw slider 1212, screw mounting seat 1213, screw driving member 1214, support mechanism 122, support seat 1221, support slide rail 1222, support slider 1223, transmission bracket 13, synchronous rotation mechanism 14, synchronous motor 141, synchronous shaft 142, long slide groove 1421, synchronous belt 143, synchronous sleeve 144, short key 1441, test device 2, test assembly 21, test needle 211, test bracket 212, lifting mechanism 213, lifting drive 214, driving end 2141, lifting bracket 215, upper connecting part 2151, lower connecting part 2152, horizontal mounting part 2153, mounting hole 2154, sensor 22, sensor fixing plate 23. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0030] like Figures 1 to 7 As shown, a fuse resistance testing device 10 of the present invention can be installed on a machine platform 20 to perform resistance testing on fuses 30 in batches.

[0031] See also Figure 2 , Figure 4 and Figure 5 The testing device 10 includes a transmission device 1 and a testing device 2 .

[0032] The transmission device 1 comprises two conveyor belt mechanisms 11 arranged side by side and at an interval. The two conveyor belt mechanisms 11 rotate synchronously, and the interval between the two conveyor belt mechanisms 11 is adjustable so as to facilitate the use of fuses 30 with different tube lengths.

[0033] The two conveyor belt mechanisms 11 are used to set up and transmit the fuse 30 to be tested, and the two ends of the fuse 30 are respectively set on the two conveyor belt mechanisms 11; the fuse 30 of this embodiment takes the fuse 30 with a circular tube body as an example, and the two ends of the fuse 30 have connecting terminal boards 301, which are directly set on the conveyor belt mechanism 11, which can avoid the fuse 30 from shifting and rotating during the transmission process.

[0034] The testing device 2 includes two testing components 21, which are also arranged side by side and at intervals, and correspond to two conveyor belt mechanisms 11 respectively. Each testing component 21 has two liftable testing needles 211, and the two testing needles 211 are located above the corresponding conveyor belt mechanisms 11; the two testing components 21 have a total of four testing needles 211, which are used to realize four-terminal resistance measurement.

[0035] In this way, by using the four test pins 211 that can be lifted and lowered, when the fuse 30 is transferred to the bottom of the test device 2 along with the conveyor mechanism 11, the four test pins 211 are controlled to descend, and two of them are respectively pressed against the connection terminal boards 301 at both ends of the fuse 30. The four test pins 211 can be connected to the test circuit (not shown in the figure), so that the four-terminal resistance measurement method can be implemented by using the four test pins 211, and the accurate resistance of the fuse 30 can be tested and obtained, and even if the fuse 30 is skewed and the contact points of the four test pins 211 change, it will not affect the accuracy of the measurement. The four-terminal resistance measurement method is a prior art, and its specific principle will not be repeated here.

[0036] Furthermore, by arranging the transmission device 1 with two conveyor belt mechanisms 11, a space for placing the fuse 30 is formed between the two, which is more suitable for the fuse 30 of the round tube structure; and the distance between the two is adjustable, which can be suitable for fuses 30 of different lengths, greatly improving the practicality of the test equipment 10.

[0037] At the same time, in order to facilitate the adjustment of the distance between the two conveyor belt mechanisms 11, the transmission device 1 of this embodiment also includes a distance adjustment mechanism 12 and two transmission brackets 13 arranged side by side and at intervals. The two conveyor belt mechanisms 11 are respectively installed on the opposite inner sides of the two transmission brackets 13; the distance adjustment mechanism 12 is used to control the distance between the two transmission brackets 13.

[0038] Specifically, Figure 6 As shown, the conveyor belt mechanism 11 includes a driving wheel 111, a driven wheel 112 and a conveyor belt 113. The driving wheel 111 and the driven wheel 112 are rotatably mounted on the two ends of the transmission bracket 13, respectively, and the conveyor belt 113 is transmission-connected to the driving wheel 111 and the driven wheel 112. Both ends of the fuse 30 can be placed on the top surface of the conveyor belt 113.

[0039] The spacing adjustment mechanism 12 includes a screw mechanism 121, which includes a screw 1211, a screw slider 1212, two screw mounting seats 1213 and a screw driving member 1214. The two screw mounting seats 1213 are fixed on the machine table 20 at intervals. The screw 1211 is rotatably passed through the two screw mounting seats 1213. The screw slider 1212 is assembled on the screw 1211. The screw driving member 1214 is used to drive the screw 1211 to rotate so as to drive the screw slider 1212 to slide back and forth in a straight line. The two transmission brackets 13 are respectively connected and fixed to the screw slider 1212 and one of the screw mounting seats 1213.

[0040] In this embodiment, the screw drive 1214 is a hand-cranked turntable, which can drive the screw 1211 to rotate by rotating the hand-cranked turntable. The screw 1211 rotates to drive the screw slider 1212 to slide, thereby driving one of the transmission brackets 13 and the conveyor belt mechanism 11 connected to the screw slider 1212 to move, while the other transmission bracket 13 and the conveyor belt mechanism 11 are fixed separately. Therefore, the distance between the two conveyor belt mechanisms 11 can be adjusted conveniently and quickly.

[0041] Of course, the screw drive member 1214 can also be a screw drive motor (not shown), which is more convenient and labor-saving.

[0042] At the same time, since the transmission bracket 13 and the conveyor belt mechanism 11 of this embodiment are relatively long, the spacing adjustment mechanism 12 also includes two supporting mechanisms 122, see Figure 3 The screw mechanism 121 can be arranged below the middle of the transmission bracket 13, and the two supporting mechanisms 122 are respectively arranged below the two sides of the screw mechanism 121; to support the long strip transmission bracket 13 and the conveyor belt mechanism 11, to ensure that the transmission bracket 13 and the conveyor belt mechanism 11 can move stably.

[0043] like Figure 6 As shown, the support mechanism 122 includes a support seat 1221, a support rail 1222 and a support slider 1223. The support rail 1222 is arranged at one side of the support seat 1221. The support slider 1223 is slidably mounted on the support rail 1222. The support seat 1221 is connected to the transmission bracket 13 connected to the screw rod mounting seat 1213. The support slider 1223 is connected to the transmission bracket 13 connected to the screw rod slider 1212. The support slider 1223 and the support rail 1222 are arranged so that the transmission bracket 13 moves along with the screw rod slider 1212.

[0044] like Figure 7As shown, in this embodiment, the test assembly 21 also includes a test bracket 212 and a lifting mechanism 213. The test bracket 212 is connected to the outer side of the transmission bracket 13; the lifting mechanism 213 is installed on the inner side of the test bracket 212 and is located above the conveyor belt mechanism 11; the lifting mechanism 213 includes a lifting drive 214 and a lifting bracket 215. The lifting drive 214 is fixed to the test bracket 212, and the upper end of the lifting bracket 215 is connected to the driving end 2141 at the lower end of the lifting drive 214. Two test needles 211 are installed side by side below the lifting bracket 215. The lifting drive 214 can be a lifting cylinder, which can drive the lifting bracket 215 to rise and fall with the test needles 211.

[0045] Specifically, the lifting bracket 215 includes an upper connecting portion 2151 and two symmetrically arranged “L”-shaped lower connecting portions 2152 . A mounting hole 2154 for mounting the test pin 211 is vertically penetrated through the horizontal mounting portion 2153 of the lower connecting portion 2152 .

[0046] In this embodiment, the testing device 2 also includes a sensor 22 and a controller (not shown). The sensor 22 is used to identify whether there is a fuse 30 under the test needle 211. The sensor 22 can be installed on the top surface of the transmission bracket 13 under one of the lifting mechanisms 213 through a sensor fixing plate 23.

[0047] The controller is electrically connected to the sensor 22, the conveyor mechanism 11 and the test assembly 21, and is used to control whether the conveyor mechanism 11 is running or not and the lifting and lowering of the test needle 211. The sensor 22 and the controller are arranged to cooperate to realize automated testing. During the test process, the transmission device 1 continuously transmits the fuse 30. When the fuse 30 passes under the test needle 211, it is detected by the sensor 22. At this time, the sensor 22 triggers the controller to pause the conveyor mechanism 11, and then controls the lifting drive 214 to drive the test needle 211 to descend to measure the resistance of the fuse 30. When the test is completed, the test needle 211 is controlled to rise again, and the conveyor mechanism 11 is started to move the tested fuse 30 out from under the test needle 211, and drive the next fuse 30 to enter under the test needle 211, and then repeat the above operation, so as to realize automated batch testing, which can save manpower and improve test efficiency.

[0048] like Figure 6 As shown, the transmission device 1 also includes a synchronous rotation mechanism 14, which is provided with a synchronous motor 141, which can drive the two conveyor belt mechanisms 11 to rotate synchronously. Of course, the driving wheels 111 of the two conveyor belt mechanisms 11 can also be connected to independent motors to rotate.

[0049] Specifically, the synchronous rotation mechanism 14 of this embodiment includes a synchronous motor 141 and a synchronous shaft 142 . The synchronous motor 141 can be connected to the synchronous shaft 142 via a synchronous belt 143 . The synchronous motor 141 can be connected and fixed to one side transmission bracket 13 .

[0050] The driving wheels 111 of the two conveyor belt mechanisms 11 are coaxially arranged on the synchronous rotating shaft 142, one of the driving wheels 111 is connected and fixed to the synchronous rotating shaft 142; the other driving wheel 111 and the corresponding transmission bracket 13 can be axially slidably connected to the synchronous rotating shaft 142, and the other driving wheel 111 and the synchronous rotating shaft 142 are synchronously rotated. The axial sliding cooperation is set so that when the screw slider 1212 drives the transmission bracket 13 to slide, there is no need to disassemble the synchronous rotation mechanism 14.

[0051] Specifically, one end of the synchronous shaft 142 is connected to one of the driving wheels 111 by a key; the other end of the synchronous shaft 142 is provided with a long slide groove 1421 extending along the axial direction, and a synchronous sleeve 144 is provided between the other driving wheel 111 and the synchronous shaft 142. A short key groove (not shown) is provided inside the synchronous sleeve 144, and a short key 1441 that is slidably matched with the long slide groove 1421 is installed in the short key groove, and a key connection is formed between the outer side of the synchronous sleeve 144 and the other driving wheel 111. The key connection is provided to realize the coaxial rotation of the synchronous shaft 142 and the two driving wheels 111, and the cooperation of the short key 1441 in the synchronous sleeve 144 and the long slide groove 1421 of the synchronous shaft 142 can realize the axial sliding and synchronous rotation between the driving wheel 111 and the synchronous shaft 142.

[0052] The above is only a preferred embodiment of the utility model, and the protection scope of the utility model is not limited to the above embodiments. All technical solutions under the idea of ​​the utility model belong to the protection scope of the utility model. It should be pointed out that for ordinary technicians in this technical field, equivalent changes and modifications without departing from the principle of the utility model should still fall within the protection scope of the utility model.

[0053] In the description of the embodiments of the present application, it should be understood that the indicated orientation or position relationship is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the application is usually placed when in use, or is the orientation or position relationship commonly understood by technical personnel in this field. It is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0054] In the description of the embodiments of the present application, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

Claims

1. A fuse resistance testing device, characterized in that: Including transmission device and testing device; The transmission device comprises two conveyor belt mechanisms arranged side by side and at an interval, the two conveyor belt mechanisms rotate synchronously, and the interval between the two conveyor belt mechanisms is adjustable; The two conveyor belt mechanisms are used to set up and transmit the fuse to be tested, and the two ends of the fuse are respectively set up on the two conveyor belt mechanisms; The testing device includes two testing components, which are also arranged side by side and at intervals and correspond to two conveyor belt mechanisms respectively. Each testing component has two liftable testing needles, and the two testing needles are located above the corresponding conveyor belt mechanisms. The two testing components have a total of four testing needles for realizing four-terminal resistance measurement.

2. A fuse resistance testing device according to claim 1, characterized in that: The testing device also includes a sensor and a controller. The sensor is used to identify whether there is a fuse under the test needle. The controller is electrically connected to the sensor, the conveyor belt mechanism and the testing assembly, and is used to control whether the conveyor belt mechanism is running and whether the test needle is raised or lowered.

3. A fuse resistance testing device according to claim 1, characterized in that: The transmission device also includes a spacing adjustment mechanism and two transmission brackets arranged side by side and at intervals, and two conveyor belt mechanisms are respectively installed on the opposite inner sides of the two transmission brackets; the spacing adjustment mechanism is used to control the spacing between the two transmission brackets.

4. A fuse resistance testing device according to claim 3, characterized in that: The spacing adjustment mechanism includes a screw mechanism, which includes a screw, a screw slider, two screw mounting seats and a screw driving member, the two screw mounting seats are arranged at intervals, the screw can be rotatably passed through the two screw mounting seats, the screw slider is assembled on the screw, and the screw driving member is used to drive the screw to rotate so as to drive the screw slider to slide back and forth linearly; The two transmission brackets are respectively connected and fixed to the screw slider and one of the screw mounting seats.

5. A fuse resistance testing device according to claim 4, characterized in that: The spacing adjustment mechanism also includes two supporting mechanisms, the screw mechanism is arranged at the lower middle part of the transmission bracket, and the two supporting mechanisms are respectively arranged at the lower sides of the screw mechanism; the supporting mechanism includes a supporting seat, a supporting slide rail and a supporting slider, the supporting slide rail is arranged at one side of the support seat, the supporting slider can be slidably assembled on the supporting slide rail, the support seat is connected to the transmission bracket connected to the screw mounting seat, and the supporting slider is connected to the transmission bracket connected to the screw slider.

6. A fuse resistance testing device according to claim 4, characterized in that: The screw drive member is a hand-cranked turntable or a screw drive motor.

7. A fuse resistance testing device according to claim 3 or 4, characterized in that: The transmission device also includes a synchronous rotation mechanism; the synchronous rotation mechanism includes a synchronous motor and a synchronous shaft, and the synchronous motor is connected to the synchronous shaft in a transmission manner; the conveyor belt mechanism includes a driving wheel, a driven wheel and a conveyor belt, and the driving wheel and the driven wheel are respectively rotatably installed at the two ends of the transmission bracket, and the conveyor belt is connected to the driving wheel and the driven wheel in a transmission manner; the driving wheels of the two conveyor belt mechanisms are coaxially penetrated by the synchronous shaft, and one of the driving wheels is fixedly connected to the synchronous shaft; the other driving wheel and the corresponding transmission bracket can be axially slidably connected to the synchronous shaft, and the other driving wheel rotates synchronously with the synchronous shaft.

8. A fuse resistance testing device according to claim 7, characterized in that: One end of the synchronous shaft is connected to one of the driving wheels by a key; the other end of the synchronous shaft is provided with a long slide groove extending along the axial direction, a synchronous sleeve is provided between the other driving wheel and the synchronous shaft, a short key groove is provided on the inner side of the synchronous sleeve, a short key that slides in conjunction with the long slide groove is installed in the short key groove, and the outer side of the synchronous sleeve is connected to the other driving wheel by a key.

9. A fuse resistance testing device according to claim 3, characterized in that: The test assembly also includes a test bracket and a lifting mechanism, the test bracket is connected to the outer side of the transmission bracket; the lifting mechanism is installed on the inner side of the test bracket and is located above the conveyor belt mechanism; the lifting mechanism includes a lifting drive and a lifting bracket, the lifting drive is fixed to the test bracket, the upper end of the lifting bracket is connected to the driving end of the lower end of the lifting drive, and two test needles are installed side by side below the lifting bracket.

10. A fuse resistance testing device according to claim 9, characterized in that: The lifting bracket includes an upper connecting part and two symmetrically arranged "L"-shaped lower connecting parts, and a mounting hole for mounting a test pin is vertically penetrated on the horizontal mounting part of the lower connecting part.

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