Filter cloth rapping device for filter press

Abstract

The filter cloth rapping device comprises a concave frame, an electric telescopic rod fixedly penetrates through the upper portion of the concave frame, a T-shaped vertical rod penetrates through the upper portion of the concave frame in a sliding mode, installation blocks are installed at the lower end of the electric telescopic rod and the lower end of the T-shaped vertical rod, a control panel is installed on one side of the concave frame, and the control panel is installed on the other side of the concave frame. A plurality of groups of first clamping plates and second clamping plates are arranged between the two groups of mounting blocks, two groups of connecting plates are mounted on the inner top surface of the concave frame, a mounting box is mounted at the lower ends of the two groups of connecting plates, a two-way screw rod is mounted between the two groups of mounting blocks through bearings, and two groups of screw rod sleeves are connected to the side wall of the two-way screw rod in a sleeving manner; and the side walls of the two groups of lead screw sleeves are fixedly sleeved with sleeving plates. The filter cloth rapping device has the beneficial effects that the first clamping plate and the second clamping plate are adopted, a plurality of pieces of filter cloth can be conveniently disassembled and assembled through the first clamping plate and the second clamping plate, and the use practicability of the filter cloth rapping device for the filter press is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of filter presses, in particular to a filter cloth vibrating device for a filter press. Background Art

[0002] The filter press uses a special filter medium to exert a certain pressure on the object, causing the liquid to seep out. It is a mechanical device widely used in chemical, pharmaceutical, metallurgical, dye, food, brewing, ceramic and environmental protection industries. The filter press needs the help of filter cloth to complete the filtering work. In actual use, a vibrating device is required to shake off the filter residue on the surface of the filter cloth. In actual use, it has the advantages of simple operation, stable structure and safe use.

[0003] The prior art discloses a filter cloth vibrating device with a publication number of CN206688315U, comprising a vibrating beam, a positioning card plate, a vibrating beam support, a vibrating beam bracket, a limiting frame, a filter cloth support rod, a filter cloth, a cylinder, a thrust plate, a cylinder seat, a filter plate and an anti-movement block. After filtering, the filter plate is pulled apart once, and the filter cloth is also pulled apart once following the filter plate. The control valve is opened under the control of the electrical system, and the compressed gas quickly enters the cylinder. The cylinder quickly lifts the vibrating beam, and the control valve controls the compressed gas to reverse again. The cylinder quickly retracts, and the vibrating beam quickly falls on the vibrating beam support due to gravity. In this process, because the filter cloth support rod is installed at the upper end of the vibrating beam, the filter cloth support rod also quickly jumps up and down with the filter cloth, and the control valve quickly repeats the reversal, so that the filter cake and residue on the filter cloth quickly fall off in the continuous vibration, so that the filter press can achieve the purpose of quickly and cleanly removing the filter cake. In this process, the limiting frame and the positioning card plate can control the vibrating beam not to shift or tilt during the up and down vibration process.

[0004] In the above utility model, multiple filter cloths are fixedly connected to the filter cloth support rods. This situation makes the disassembly and assembly of the multiple filter cloths more complicated and requires more time, reducing the practicality of the use of this utility model. At the same time, the multiple filter cloths are shaken up and down to complete the vibration and shaking off of the filter residue, but part of the filter residue will still be contaminated on the surface of the multiple filter cloths, which brings hidden dangers to the removal of the filter residue in this utility model.

[0005] Currently, no effective solution has been proposed for the problems in the related technologies. Utility Model Content

[0006] 1. Technical issues to be solved

[0007] In view of the deficiencies in the prior art, the utility model provides a filter cloth vibrating device for a filter press, which has the advantages of being able to conveniently disassemble and assemble multiple filter cloths and accelerate the efficiency of separating filter residue from the filter cloths, thereby solving the problems in the above-mentioned background technology.

[0008] (II) Technical solution

[0009] In order to achieve the above advantages of being able to conveniently disassemble and assemble multiple filter cloths and being able to accelerate the efficiency of filter residues being separated from the filter cloths, the specific technical solutions adopted by the utility model are as follows:

[0010] A filter cloth rapping device for a filter press comprises a concave frame, an electric telescopic rod is fixedly passed through the upper part of the concave frame, a T-shaped vertical rod is slidably passed through the upper part of the concave frame, mounting blocks are installed at the lower ends of the electric telescopic rod and the T-shaped vertical rod, a control panel is installed on one side of the concave frame, multiple groups of first clamping plates and second clamping plates are arranged between two groups of the mounting blocks, two groups of connecting plates are installed on the inner top surface of the concave frame, and mounting boxes are installed at the lower ends of the two groups of connecting plates, a bidirectional wire lever is installed between the two groups of the mounting blocks through a bearing, and two groups of screw sleeves are sleeved on the side walls of the bidirectional wire lever, and sleeve plates are fixedly sleeved on the side walls of the two groups of the screw sleeves, and the sleeve plates between the two groups of the sleeve plates A guide rod is inserted through the sliding between the multiple groups of the first clamping plates and the multiple groups of the second clamping plates. A cross bar is inserted through the sliding between the multiple groups of the first clamping plates and the multiple groups of the second clamping plates. The two ends of the cross bar and the two ends of the guide rod are respectively fixedly connected to the facing surfaces of the two groups of the mounting blocks. A forward and reverse motor is installed on the other side of the mounting block of the right group, and the output end of the forward and reverse motor is connected to the bidirectional wire lever. Two groups of fixed plates are installed on the facing surfaces of the first clamping plates of the same side group and the second clamping plates of the same side group. The four groups of fixed plates on the same side are all penetrated by connecting shafts through bearings. The side walls of the four groups of connecting shafts on the same side are all sleeved with support plates. A connecting screw is inserted between two adjacent groups of the support plates. The side walls of the two groups of connecting screws on the same side are all sleeved with two groups of connecting nuts.

[0011] Furthermore, the threads of the two groups of connecting screws on the same side and the four groups of connecting nuts on the same side cooperate with each other.

[0012] Furthermore, the bidirectional wire lever cooperates with the two groups of threaded screw sleeves.

[0013] Furthermore, multiple groups of exhaust hoods are fixedly penetrated through the end surface of the installation box, and filter screens are installed inside the multiple groups of exhaust hoods, and transmission shafts are penetrated through the rear end surfaces of the multiple groups of exhaust hoods through bearings, and fan blades are sleeved on the front end side walls of the multiple groups of transmission shafts. First bevel gears are sleeved on the rear end side walls of the multiple groups of transmission shafts, and installation shafts are installed inside the installation box through bearings, and multiple groups of second bevel gears are sleeved on the side walls of the installation shafts. Breathable filters are penetrated on both sides of the installation box, and a drive motor is installed on the other side of the installation box, and the output end of the drive motor is connected to the installation shaft, and the drive motor is electrically connected to the control panel through wires.

[0014] Furthermore, multiple groups of the second bevel gears are meshed with multiple groups of the first bevel gears.

[0015] Furthermore, the control panel is electrically connected to the electric telescopic rod and the forward and reverse motor through electric wires.

[0016] (III) Beneficial effects

[0017] Compared with the prior art, the utility model provides a filter cloth vibrating device for a filter press, which has the following beneficial effects:

[0018] (1) The utility model adopts a first clamping plate and a second clamping plate. Before the filter cloth vibrating device for the filter press is actually used, the operator manually separates or approaches the first clamping plate and the second clamping plate on the same side. The four support plates on the same side rotate with the four connecting shafts on the same side as the central axis. When the first clamping plate and the second clamping plate on the same side are moved to a suitable position, the two connecting screws and the four connecting nuts on the same side cooperate with each other. The operator manually rotates the four connecting nuts on the same side clockwise or counterclockwise. When the four connecting nuts on the same side are in close contact with the four support plates on the same side, the length of the gap between the first clamping plate and the second clamping plate on the same side is fixed, and the gaps between the remaining first clamping plates and the remaining second clamping plates are adjusted. It can be seen from the same operation that the upper part of a filter cloth can be inserted into the adjacent first clamping plate and the adjacent second clamping plate. The plates are used, and the rest of the filter cloths can be used in the same way. Afterwards, the control panel is used to make the forward and reverse motors work, and the output ends of the forward and reverse motors can drive the two-way wire levers to rotate. Since the two-way wire levers cooperate with the two sets of screw sleeve threads, the rotating two-way wire levers can push the two sets of screw sleeves to approach or move away from each other, and the two sets of screw sleeves can respectively pass through the two sets of socket plates to make multiple sets of first clamping plates and multiple sets of second clamping plates approach each other, and multiple sets of first clamping plates and multiple sets of second clamping plates can clamp multiple filter cloths. At this time, the control panel is used to intermittently extend and retract the electric telescopic rod, and through the two sets of mounting blocks, multiple sets of first clamping plates and multiple sets of second clamping plates, multiple filter cloths can be vibrated up and down. In this process, filter residues on the surfaces of multiple filter cloths will fall off, and through the first clamping plates and the second clamping plates that are set, multiple filter cloths can be conveniently disassembled and assembled, thereby improving the practicality of the filter cloth vibrating device for the filter press.

[0019] (2) The utility model adopts an installation box. According to the above operation, after the installation of multiple filter cloths, the control panel is used to intermittently extend and retract the electric telescopic rod. Through two sets of installation blocks, multiple sets of first clamping plates and multiple sets of second clamping plates, the multiple filter cloths can be vibrated up and down. At the same time, the control panel is used to operate the drive motor. The output end of the drive motor can drive the installation shaft to rotate. The rotating installation shaft can drive the multiple sets of second bevel gears to rotate. Since the multiple sets of second bevel gears are meshed with the multiple sets of first bevel gears, the rotating multiple sets of second bevel gears can drive the multiple sets of first bevel gears to rotate. The rotating multiple sets of first bevel gears can rotate the multiple sets of fan blades through the multiple sets of transmission shafts. The rotating multiple sets of fan blades can form flowing gas and move toward the multiple filter cloths. The flowing gas can blow off the filter residue on the surface of the multiple filter cloths. The rear end faces of the multiple sets of exhaust hoods are equipped with multiple sets of filter screen structures. The two sets of breathable filter screens and the multiple sets of filter screen structures can ensure that the gas enters the interior of the multiple sets of exhaust hoods. The multiple sets of filter screens can prevent impurities from entering the interior of the multiple sets of exhaust hoods. Through the installation box that is set up, the efficiency of the filter residue separating from the filter cloth can be accelerated, which provides a guarantee for the cleaning work of the filter cloth vibrating device for the filter press. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a structural schematic diagram of a filter cloth vibrating device for a filter press proposed by the utility model;

[0022] Figure 2 It is a three-dimensional diagram of the support plate proposed by the utility model;

[0023] Figure 3 It is a cross-sectional schematic diagram of the installation box proposed by the utility model;

[0024] Figure 4 The utility model proposes Figure 1 A magnified view of middle;

[0025] Figure 5 The utility model proposes Figure 1 Enlarged view of middle B;

[0026] Figure 6 The utility model proposes Figure 3 Enlarged view of C in the middle.

[0027] In the figure:

[0028] 1. Concave frame; 2. Electric telescopic rod; 3. T-shaped vertical rod; 4. Mounting block; 5. Mounting box; 6. Connecting plate; 7. Cross bar; 8. First clamping plate; 9. Second clamping plate; 10. Screw lever; 11. Screw sleeve; 12. Socket plate; 13. Guide rod; 14. Fixed plate; 15. Connecting shaft; 16. Support plate; 17. Connecting screw; 18. Connecting nut; 19. Forward and reverse motor; 20. Exhaust hood; 21. Filter; 22. Transmission shaft; 23. First bevel gear; 24. Fan blade; 25. Mounting shaft; 26. Second bevel gear; 27. Breathable filter; 28. Drive motor. DETAILED DESCRIPTION

[0029] To further illustrate each embodiment, the present invention provides drawings, which are part of the disclosure of the present invention and are mainly used to illustrate the embodiments. They can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, ordinary technicians in the field should be able to understand other possible implementation methods and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0030] According to an embodiment of the utility model, a filter cloth vibrating device for a filter press is provided.

[0031] The present invention is now further described in conjunction with the accompanying drawings and specific implementation methods. Figure 1-6As shown, a filter cloth rapping device for a filter press according to an embodiment of the utility model comprises a concave frame 1, an electric telescopic rod 2 is fixedly penetrated through the upper part of the concave frame 1, a T-shaped vertical rod 3 is slidably penetrated through the upper part of the concave frame 1, a mounting block 4 is installed at the lower ends of the electric telescopic rod 2 and the T-shaped vertical rod 3, a control panel is installed on one side of the concave frame 1, multiple groups of first clamping plates 8 and second clamping plates 9 are arranged between the two groups of mounting blocks 4, two groups of connecting plates 6 are installed on the inner top surface of the concave frame 1, and mounting boxes 5 are installed at the lower ends of the two groups of connecting plates 6, a bidirectional wire lever 10 is installed between the two groups of mounting blocks 4 through bearings, and two groups of lead screw sleeves 11 are sleeved on the side walls of the two-way wire lever 10, and the side walls of the two groups of lead screw sleeves 11 are fixedly sleeved with sleeve plates 12, and guide rods 13 are slidably penetrated between the two groups of sleeve plates 12, multiple groups of first clamping plates 8 and multiple groups A cross bar 7 is slidably penetrated between the second clamping plates 9, and both ends of the cross bar 7 and the two ends of the guide rod 13 are respectively fixedly connected to the facing surfaces of the two groups of mounting blocks 4. A forward and reverse motor 19 is installed on the other side of a group of mounting blocks 4 on the right side, and the output end of the forward and reverse motor 19 is connected to the two-way wire lever 10. Two groups of fixed plates 14 are installed on the facing surfaces of a first clamping plate 8 and a second clamping plate 9 on the same side. The four groups of fixed plates 14 on the same side are penetrated by connecting shafts 15 through bearings, and the side walls of the four groups of connecting shafts 15 on the same side are sleeved with support plates 16. A connecting screw 17 is penetrated between two adjacent groups of support plates 16, and the side walls of the two groups of connecting screws 17 on the same side are sleeved with two groups of connecting nuts 18. By setting the first clamping plate 8 and the second clamping plate 9, multiple filter cloths can be conveniently disassembled and assembled, thereby improving the practicality of the filter cloth vibrating device for the filter press.

[0032] In one embodiment, the threads of the two groups of connecting screws 17 and the four groups of connecting nuts 18 on the same side cooperate with each other, so as to facilitate the adjustment of the use positions of the four groups of connecting nuts 18 on the same side.

[0033] In one embodiment, the two-way screw lever 10 and the two sets of screw sleeves 11 are threadably matched with each other to facilitate adjustment of the use positions of the two sets of screw sleeves 11 .

[0034] In one embodiment, the end surface of the installation box 5 is fixedly penetrated by multiple groups of exhaust hoods 20, and the interiors of the multiple groups of exhaust hoods 20 are all installed with filter screens 21, the rear end surfaces of the multiple groups of exhaust hoods 20 are penetrated by transmission shafts 22 through bearings, the front end side walls of the multiple groups of transmission shafts 22 are all sleeved with fan blades 24, and the rear end side walls of the multiple groups of transmission shafts 22 are all sleeved with first bevel gears 23. The interior of the installation box 5 is installed with installation shafts 25 through bearings, and the side walls of the installation shafts 25 are sleeved with multiple groups of second bevel gears 26. Both sides of the installation box 5 are penetrated by air-permeable filter screens 27, and the other side of the installation box 5 is installed with a drive motor 28, and the output end of the drive motor 28 is connected to the installation shaft 25, and the drive motor 28 is electrically connected to the control panel through electric wires. By setting up the installation box 5, the efficiency of the filter residue being separated from the filter cloth can be accelerated, which provides a guarantee for the cleaning work of the filter cloth vibrating device for the filter press.

[0035] In one embodiment, the plurality of sets of second bevel gears 26 mesh with the plurality of sets of first bevel gears 23 , so that the plurality of sets of second bevel gears 26 push the plurality of sets of first bevel gears 23 to rotate.

[0036] In one embodiment, the control panel is electrically connected to the electric telescopic rod 2 and the forward and reverse motor 19 through wires. The control panel can be implemented through simple programming by technicians in this field. It is common knowledge in the field and is only used without modification. Therefore, the control method and circuit connection will not be described in detail.

[0037] Working principle:

[0038] Before actually using the filter cloth vibrating device for the filter press, the operator uses his hands to separate or bring close to each other the first clamping plates 8 and the second clamping plates 9 of the same side, and the four support plates 16 of the same side rotate with the four connecting shafts 15 of the same side as the central axis. When the first clamping plates 8 and the second clamping plates 9 of the same side are moved to the appropriate positions, the two connecting screws 17 and the four connecting nuts 18 of the same side cooperate with each other, and the operator rotates the four connecting nuts 18 of the same side clockwise and counterclockwise by hand. When the four connecting nuts 18 of the same side are in close contact with the four support plates 16 of the same side, the length of the gap between the first clamping plates 8 and the second clamping plates 9 of the same side is fixed, and the adjustment of the gaps between the remaining groups of first clamping plates 8 and the remaining groups of second clamping plates 9 is performed in the same way. It can be known that, after that, the upper part of a filter cloth can be inserted between an adjacent group of first clamping plates 8 and an adjacent group of second clamping plates 9, and the use of the remaining filter cloths can be obtained by the same operation. After that, the control panel is used to make the forward and reverse motor 19 work, and the output end of the forward and reverse motor 19 can drive the bidirectional wire lever 10 to rotate. Since the bidirectional wire lever 10 and the two groups of screw sleeves 11 threads cooperate with each other, the rotating bidirectional wire lever 10 can push the two groups of screw sleeves 11 to approach or move away from each other, and the two groups of screw sleeves 11 can respectively pass through the two groups of socket plates 12 to make multiple groups of first clamping plates 8 and multiple groups of second clamping plates 9 approach each other, and multiple groups of first clamping plates 8 and multiple groups of second clamping plates 9 can clamp multiple filter cloths. At this time, the control panel is used to intermittently extend and retract the electric telescopic rod 2 through the two groups of mounting blocks 4. Multiple groups of first clamping plates 8 and multiple groups of second clamping plates 9 can make multiple filter cloths vibrate up and down. During this process, filter residues on the surfaces of multiple filter cloths will fall off. By setting the first clamping plates 8 and the second clamping plates 9, multiple filter cloths can be conveniently disassembled and assembled, thereby improving the practicality of the filter cloth vibrating device for the filter press. At the same time, according to the above operation, after the multiple filter cloths are installed, the control panel is used to intermittently extend and retract the electric telescopic rod 2. Through the two groups of mounting blocks 4, multiple groups of first clamping plates 8 and multiple groups of second clamping plates 9, multiple filter cloths can be vibrated up and down. At the same time, the control panel is used to make the drive motor 28 work. The output end of the drive motor 28 can drive the mounting shaft 25 to rotate. The rotating mounting shaft 25 can drive multiple groups of second bevel gears 26 to rotate. 26 is meshed with multiple sets of first bevel gears 23, and the rotating multiple sets of second bevel gears 26 can drive the multiple sets of first bevel gears 23 to rotate. The rotating multiple sets of first bevel gears 23 can rotate the multiple sets of fan blades 24 through the multiple sets of transmission shafts 22. The rotating multiple sets of fan blades 24 can form flowing gas and move toward the multiple filter cloths. The flowing gas can blow off the filter residues on the surfaces of the multiple filter cloths. The rear end faces of the multiple sets of exhaust hoods 20 are equipped with multiple sets of filter screen structures. The two sets of breathable filter screens 27 and the multiple sets of filter screen structures can ensure that the gas enters the interior of the multiple sets of exhaust hoods 20. The multiple sets of filter screens 21 can prevent impurities from entering the interior of the multiple sets of exhaust hoods 20. By setting the installation box 5, the efficiency of the filter residue separating from the filter cloth can be accelerated, which provides a guarantee for the cleaning work of the filter cloth vibrating device for the filter press.

[0039] In the present utility model, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the utility model according to the specific circumstances.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A filter cloth vibrating device for a filter press, characterized in that: The invention comprises a concave frame (1), wherein an electric telescopic rod (2) is fixedly passed through the upper part of the concave frame (1), a T-shaped vertical rod (3) is slidably passed through the upper part of the concave frame (1), the lower ends of the electric telescopic rod (2) and the T-shaped vertical rod (3) are both installed with mounting blocks (4), a control panel is installed on one side of the concave frame (1), a plurality of first clamping plates (8) and second clamping plates (9) are arranged between two groups of the mounting blocks (4), two groups of connecting plates (6) are installed on the inner top surface of the concave frame (1), and mounting boxes (5) are installed at the lower ends of the two groups of the connecting plates (6), a bidirectional wire lever (10) is installed between the two groups of the mounting blocks (4) through a bearing, and the side walls of the bidirectional wire lever (10) are sleeved with two groups of screw sleeves (11), and the side walls of the two groups of the screw sleeves (11) are both fixedly sleeved with sleeve plates (12), and a guide rod (12) is slidably passed through the two groups of the sleeve plates (12). 13), a cross bar (7) is slidably passed through multiple groups of the first clamping plates (8) and multiple groups of the second clamping plates (9), and the two ends of the cross bar (7) and the two ends of the guide rod (13) are respectively fixedly connected to the facing surfaces of the two groups of the mounting blocks (4), and a forward and reverse motor (19) is installed on the other side of the right group of mounting blocks (4), and the output end of the forward and reverse motor (19) is connected to the bidirectional wire lever (10), and the facing surfaces of the first clamping plates (8) and the second clamping plates (9) on the same side are both installed with two groups of fixed plates (14), and the four groups of fixed plates (14) on the same side are all penetrated by connecting shafts (15) through bearings, and the side walls of the four groups of connecting shafts (15) on the same side are all sleeved with support plates (16), and a connecting screw (17) is penetrated between two adjacent groups of the support plates (16), and the side walls of the two groups of connecting screws (17) on the same side are all sleeved with two groups of connecting nuts (18).

2. A filter cloth rapping device for a filter press according to claim 1, characterized in that: The threads of the two groups of connecting screws (17) on the same side and the four groups of connecting nuts (18) on the same side cooperate with each other.

3. A filter cloth rapping device for a filter press according to claim 1, characterized in that: The bidirectional thread lever (10) and the two groups of threaded screw sleeves (11) are mutually matched.

4. A filter cloth rapping device for a filter press according to claim 1, characterized in that: The end surface of the installation box (5) is fixedly penetrated by a plurality of exhaust hoods (20), and a filter screen (21) is installed inside the plurality of exhaust hoods (20). The rear end surfaces of the plurality of exhaust hoods (20) are penetrated by a transmission shaft (22) through a bearing, and the front end side walls of the plurality of transmission shafts (22) are sleeved with fan blades (24), and the rear end side walls of the plurality of transmission shafts (22) are sleeved with a first bevel gear (23). The interior of the installation box (5) is installed with a mounting shaft (25) through a bearing, and the side walls of the mounting shaft (25) are sleeved with a plurality of second bevel gears (26). Both sides of the installation box (5) are penetrated by air-permeable filter screens (27), and the other side of the installation box (5) is installed with a drive motor (28), and the output end of the drive motor (28) is connected to the installation shaft (25), and the drive motor (28) is electrically connected to the control panel through an electric wire.

5. A filter cloth rapping device for a filter press according to claim 4, characterized in that: A plurality of sets of the second bevel gears (26) are meshed with a plurality of sets of the first bevel gears (23).

6. A filter cloth rapping device for a filter press according to claim 1, characterized in that: The control panel is electrically connected to the electric telescopic rod (2) and the forward and reverse motor (19) via electric wires.

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