A milling device for high-voltage eccentric contact seats

Abstract

The present invention discloses a milling hole device for a high-voltage eccentric contact seat, which relates to the technical field of high-voltage eccentric contact seat production, and comprises a bottom plate, a conveying track is fixedly connected to the bottom plate, openings are arranged on both the front and rear sides of the conveying track, two vertical plates and side plates are fixedly connected to the bottom plate, the side plates are fixedly connected to the right sides of the two vertical plates, the adjacent sides of the two vertical plates are rotatably connected with a cross bar, and a plurality of feeding assemblies are arranged on the cross bar. The device can efficiently clamp parts and accurately transfer them to a processing area parallel to the milling cutter for milling hole operation, and this process not only ensures the continuity and efficiency of processing, but also significantly improves the processing rate of the eccentric contact seat. During processing, the device can automatically clean up the debris generated in the hole, and collect the cleaned up debris and the parts that have been processed separately, which not only simplifies the processing steps, but also greatly promotes the overall efficiency and product quality of the eccentric contact seat production line.

Description

Technical Field

[0001] The invention relates to the technical field of high-voltage eccentric contact seat production, in particular to a milling device for a high-voltage eccentric contact seat. Background Art

[0002] In the power system, eccentric contacts are used in high-voltage switchgear, transformers and other equipment. The eccentric design may be to meet special electrical performance requirements, such as optimizing electric field distribution, reducing partial discharge, and improving contact reliability. For example, in some high-voltage circuit breakers, the use of high-voltage eccentric contacts can better control the arc movement during the breaking process, thereby improving the breaking capacity and service life of the circuit breaker.

[0003] In the process of producing eccentric contact seats, milling processing is required. The existing milling equipment usually clamps the material and then uses a milling cutter for processing. However, each time this method is used for processing, a part needs to be removed after processing, and then a new part needs to be clamped and milled again, resulting in low processing efficiency of the eccentric contact seat. In addition, during the processing, debris will be generated during the milling process. These debris will adhere to the hole wall, causing the eccentric contact seat to have circuit failures such as leakage during use. In order to avoid this situation, the existing technology needs to clean the eccentric contact seat after milling, which increases the processing steps of the eccentric contact seat. Therefore, it is necessary to design a milling device for high-voltage eccentric contact seats to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings existing in the prior art, and a milling device for a high-pressure eccentric contact seat is proposed. The device can automatically clamp the parts and send them to a position parallel to the milling cutter for milling, and can perform continuous processing, which greatly improves the processing efficiency of the eccentric contact seat. At the same time, during the processing, the debris in the hole can be automatically cleaned, and the debris and the processed parts can be collected separately, thereby reducing the processing steps of the eccentric contact seat and greatly improving the production efficiency of the eccentric contact seat.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A milling device for a high-voltage eccentric contact seat comprises a bottom plate, a conveying track is fixedly connected to the bottom plate, openings are arranged on the front and rear sides of the conveying track, two vertical plates and side plates are fixedly connected to the bottom plate, the side plates are fixedly connected to the right sides of the two vertical plates, the adjacent sides of the two vertical plates are connected to a cross bar for common rotation, a plurality of feeding assemblies are arranged on the cross bar, a second motor is installed on the vertical plate at the rear side, the output shaft end of the second motor is fixedly connected to the cross bar, the feeding assembly comprises a feeding box arranged on the cross bar, the feeding An electromagnet is embedded in the inner wall of the box on one side close to the cross bar, a sliding rod is slidably connected in the feeding box, the sliding rod and the adjacent side of the electromagnet are elastically connected by a spring, a rectangular plate is fixedly connected to the side of the sliding rod away from the cross bar, two clamping boxes are fixedly connected to the rectangular plate, hydraulic rods are fixedly connected to the inner walls of the two clamping boxes on the opposite sides, and clamping blocks are fixedly connected to the telescopic ends of the two hydraulic rods, a plurality of sensing blocks are provided on the cross bar, a proximity sensor is installed on the vertical plate located on the front side, and a milling assembly is installed on the side plate.

[0007] Preferably, the space near one side of the cross bar of each loading box is connected to the outside through a short tube, and multiple short tubes are provided with solenoid valves. Multiple conductive rods are fixed to the outer wall of the cross bar, and two conductive plates are installed on the vertical plate on the rear side.

[0008] Preferably, the milling assembly comprises a first motor mounted on the side plate, the output shaft of the first motor passes through the side plate and is fixedly connected to a pneumatic rod, and the telescopic end of the pneumatic rod is fixedly connected to a milling cutter.

[0009] Preferably, a purge assembly is also included, which includes a strip plate fixedly connected to the left side of the two vertical plates, a thick tube is rotatably connected to the right side of the strip plate, a hollow circular plate is fixedly connected to the right side of the thick tube, a plurality of jet pipes are fixedly connected to the right side of the hollow circular plate, a rotary joint is installed on the left side of the strip plate, the left side of the thick tube is connected to the rotary joint, a high-pressure air pump is installed on the vertical plate located on the rear side, the air outlet of the high-pressure air pump is connected to a three-way pipe, and one end of the three-way pipe is connected to the left side of the rotary joint.

[0010] Preferably, two mounting blocks are fixedly connected to the vertical plate located on the front side, and adjacent sides of the two mounting blocks are rotatably connected with a transmission rod, the transmission rod is connected to the pneumatic rod through a first transmission assembly, and the transmission rod is connected to the thick tube through a second transmission assembly.

[0011] Preferably, a collecting box is provided at the upper end of the bottom plate, and a material discharge separation assembly is provided between the two vertical plates, the material discharge separation assembly includes a material discharge plate fixed between the two vertical plates, the material discharge plate is inclined, an L-shaped channel is provided at the upper end of the material discharge plate, a filter screen is provided in the L-shaped channel, a hollow plate is fixedly connected between the inner bottom of the L-shaped channel and the filter screen, a plurality of air outlets are provided on the left side of the hollow plate, the hollow plate is connected to the other end of the three-way pipe, and a slag outlet is provided on the right side of the L-shaped channel.

[0012] Preferably, two fixed blocks are fixedly connected to the right side of the blanking plate, and the adjacent sides of the two fixed blocks are connected to a rotating shaft for common rotation. The rotating shaft is elastically connected to the fixed block located on the front side through a torsion spring, and a flip plate is fixedly connected to the rotating shaft. Two guard plates are fixedly connected to the upper end of the flip plate, and both of the guard plates are L-shaped.

[0013] Preferably, the plurality of conductive rods and two conductive sheets constitute a plurality of conductive switches, a power supply is provided on the base plate, the power supply, the plurality of conductive switches and the plurality of solenoid valves constitute a loop through wires, the plurality of conductive switches and the corresponding solenoid valves constitute a series circuit, and the plurality of series circuits are connected in parallel in the loop.

[0014] The present invention has the following beneficial effects:

[0015] 1. Compared with the prior art, the conveying track, the crossbar and the multiple feeding components are arranged so that the parts in the conveying track can be automatically clamped and sent to a position parallel to the milling cutter for milling processing. In the process of milling, the next part can be clamped, so that continuous milling processing can be performed, which greatly improves the processing efficiency of the eccentric contact seat;

[0016] 2. Compared with the prior art, by setting up multiple conductive units, short tubes and solenoid valves, the short tubes will be blocked during the milling process of the parts, so that the sliding rod will not move, and the parts will not move during the milling process, thereby ensuring the quality of the milling holes;

[0017] 3. Compared with the prior art, by setting up multiple jet pipes, the debris in the milling hole can be blown out by airflow, so that no debris will remain on the hole wall. At the same time, during processing, the hollow circular plate will drive the multiple jet pipes to rotate, so as to have a better cleaning effect on the debris in the hole wall;

[0018] 4. Compared with the prior art, by setting up the collection box and the filter, the debris can be collected during the milling process, and when unloading, the parts and the cleaned debris can be automatically separated and collected to avoid the debris from adhering to the parts for the second time, thereby ensuring the cleanliness of the parts after milling.

[0019] In summary, the present invention can perform continuous processing on parts, thereby greatly improving the processing efficiency of the eccentric contact seat, and during the processing, it can ensure that the positions of the milling holes on each part are in the same position, ensuring the quality of the produced eccentric contact seat, and at the same time, it can automatically clean the debris in the hole wall, reducing the processing steps of the eccentric contact seat, and at the same time, it can avoid the secondary adhesion of debris to the parts when cutting. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of a milling hole device for a high-voltage eccentric contact seat proposed by the present invention;

[0021] Figure 2 for Figure 1 A schematic diagram of the structure from another perspective;

[0022] Figure 3 A schematic diagram of the internal structure of a milling hole device for a high-voltage eccentric contact seat proposed by the present invention;

[0023] Figure 4 is a cross-sectional view of a loading assembly;

[0024] Figure 5 for Figure 4 A cross-sectional view from another perspective;

[0025] Figure 6 It is a structural schematic diagram of the blanking plate;

[0026] Figure 7 for Figure 6 sectional view of .

[0027] In the figure: 1 bottom plate, 2 vertical plate, 3 unloading plate, 4 filter screen, 5 mounting block, 6 side plate, 7 first motor, 8 transmission rod, 9 first transmission assembly, 10 rectangular plate, 11 second motor, 12 high pressure air pump, 13 connecting pipe, 14 rotary joint, 15 guard plate, 16 strip plate, 17 induction block, 18 cross bar, 19 conveying track, 20 loading box, 21 electromagnet, 22 spring, 23 sliding rod, 24 short tube, 25 clamping box, 26 hydraulic rod, 27 clamping block, 28 milling cutter, 29 pneumatic rod, 30 collecting box, 31 hollow circular plate, 32 jet pipe, 33 conductive rod, 34 conductive sheet, 35 hollow plate, 36 main air pipe, 37 slag outlet, 38 proximity sensor, 39 flip plate, 40 torsion spring, 41 opening. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0029] Reference Figure 1-Figure 7A milling device for a high-voltage eccentric contact seat comprises a bottom plate 1, a conveying track 19 is fixedly connected to the bottom plate 1, and a vibrating loading tray is arranged outside. During processing, the left side of the conveying track 19 is connected to the vibrating loading tray, and the materials to be processed are put into the vibrating loading tray in batches, so that the parts can be stably conveyed in the conveying track 19. The front and rear sides of the conveying track 19 are provided with openings 41. Two vertical plates 2 and side plates 6 are fixedly connected to the bottom plate 1. The side plates 6 are fixedly connected to the right sides of the two vertical plates 2. The adjacent sides of the two vertical plates 2 are connected with a cross bar 18 for rotation together. A plurality of loading assemblies are arranged on the cross bar 18. A second motor 11 is installed on the vertical plate 2 at the rear side. The end of the output shaft of the second motor 11 is fixedly connected to the cross bar 18. The loading assembly comprises a loading box 20 arranged on the cross bar 18. The inner wall of the loading box 20 close to the cross bar 18 is embedded with The electromagnet 21 is slidably connected with a sliding rod 23 in the loading box 20. The sliding rod 23 is made of magnetic material. When the electromagnet 21 is energized, a repulsive force is generated on the sliding rod 23. The sliding rod 23 is elastically connected to the adjacent side of the electromagnet 21 through a spring 22. The side of the sliding rod 23 away from the cross bar 18 is fixedly connected with a rectangular plate 10. Two clamping boxes 25 are fixedly connected to the rectangular plate 10. The inner walls of the two clamping boxes 25 on the opposite sides are fixedly connected with hydraulic rods 26. The telescopic ends of the two hydraulic rods 26 are fixedly connected with clamping blocks 27. A plurality of induction blocks 17 are arranged on the cross bar 18. A proximity sensor 38 is installed on the vertical plate 2 located on the front side. A controller is arranged on the bottom plate 1. When the induction block 17 approaches the proximity sensor 38, an electrical signal is generated and transmitted to the controller. The controller controls the plurality of electromagnets 21 to be energized for a period of time. A milling assembly is installed on the side plate 6.

[0030] Among them, the space of each loading box 20 close to the side of the cross bar 18 is connected to the outside through a short tube 24, and multiple short tubes 24 are provided with solenoid valves, which are all normally open. Multiple conductive rods 33 are fixed to the outer wall of the cross bar 18, and two conductive plates 34 are installed on the vertical plate 2 located on the rear side. Multiple conductive rods 33 and two conductive plates 34 constitute multiple conductive switches. A power supply is provided on the bottom plate 1. The power supply, multiple conductive switches and multiple solenoid valves form a loop through wires. Multiple conductive switches and corresponding solenoid valves constitute a series circuit, and multiple series circuits are connected in parallel in the loop, that is, each time the short tube 24 is rotated to the right, it is in a blocked state, so that the sliding rod 23 rotated to the right cannot move.

[0031] The milling assembly includes a first motor 7 mounted on the side plate 6 , the output shaft of the first motor 7 passes through the side plate 6 and is fixedly connected to a pneumatic rod 29 , and a milling cutter 28 is fixedly connected to the telescopic end of the pneumatic rod 29 .

[0032] The purge assembly includes a strip plate 16 fixedly connected to the left side of the two vertical plates 2, a thick tube is rotatably connected to the right side of the strip plate 16, a hollow circular plate 31 is fixedly connected to the right side of the thick tube, a plurality of jet tubes 32 are fixedly connected to the right side of the hollow circular plate 31, a rotary joint 14 is installed on the left side of the strip plate 16, the left side of the thick tube is connected to the rotary joint 14, a high-pressure air pump 12 is installed on the vertical plate 2 at the rear side, the air outlet of the high-pressure air pump 12 is connected to a three-way pipe, one end of the three-way pipe is connected to the left side of the rotary joint 14, and the air outlet of the high-pressure air pump 12 is connected to the three-way pipe. Two mounting blocks 5 are fixedly connected to the vertical plate 2 on the front side, and the adjacent sides of the two mounting blocks 5 are rotatably connected with a transmission rod 8. The transmission rod 8 is connected to the pneumatic rod 29 through a first transmission assembly 9, and the transmission rod 8 is connected to the thick tube through a second transmission assembly. The first transmission assembly 9 includes a first sprocket arranged on the transmission rod 8 and the pneumatic rod 29, and the two first sprockets are connected through a first chain transmission. The second transmission assembly includes a second sprocket arranged on the transmission rod 8 and the thick tube, and the two second sprockets are connected through a second chain transmission.

[0033] Among them, a collecting box 30 is provided at the upper end of the bottom plate 1, and a material separation assembly is provided between the two vertical plates 2. The material separation assembly includes a material discharge plate 3 fixed between the two vertical plates 2, the material discharge plate 3 is inclined to the left, an L-shaped channel is provided at the upper end of the material discharge plate 3, the inner bottom of the L-shaped channel is inclined toward the front side, a filter screen 4 is provided in the L-shaped channel, a hollow plate 35 is fixedly connected between the inner bottom of the L-shaped channel and the filter screen 4, a plurality of air outlets are provided on the left side of the hollow plate 35, the hollow plate 35 is connected to the other end of the three-way pipe, and a slag outlet 37 is provided on the right side of the L-shaped channel. During processing, a filter bag can be installed on the left side of the slag outlet 37 to collect debris. Two fixed blocks are fixedly connected to the right side of the unloading plate 3. The adjacent sides of the two fixed blocks are connected to a rotating shaft for common rotation. The rotating shaft is elastically connected to the fixed block located on the front side through a torsion spring 40. A flip plate 39 is fixedly connected to the rotating shaft. Two guard plates 15 are fixedly connected to the upper end of the flip plate 39. Both guard plates 15 are L-shaped to prevent the blown debris from falling into the bottom plate 1 and the conveying track 19, resulting in the situation that the parts cannot be conveyed between the two openings 41.

[0034] The present invention can be explained by the following operation mode:

[0035] During the production of the eccentric contact seat, the vibrating loading tray is connected to the conveying track 19, and then the parts to be processed are placed in batches in the vibrating loading tray, so that the vibrating loading tray can stably convey the parts to the conveying track 19, and the equipment is powered on. The staff first controls the second motor 11 to run, so that the crossbar 18 drives the loading assembly to rotate ninety degrees;

[0036] When the loading assembly on the left side rotates to the bottom, the corresponding induction block 17 will approach the proximity sensor 38, so that the proximity sensor 38 generates an electrical signal to be transmitted to the controller, and the controller controls the multiple electromagnets 21 to be energized within a preset time, so that the electromagnets 21 produce a repulsive force on the sliding rods 23 within the preset time, thereby causing the multiple sliding rods 23 to move away from the cross bar 18 (because the conductive rod 33 on the right side is in contact with the two conductive sheets 34 at this time, the solenoid valve on the short tube 24 on the right side is energized at this time, so that the short tube 24 is not conductive, and the sliding rod 23 on the right side does not move);

[0037] At this time, the sliding rod 23 located at the bottom will move down to the top of the part, so that the two clamping blocks 27 are located at the front and rear sides of the part. The staff controls the two hydraulic rods 26 located at the bottom to stretch, so that the two clamping blocks 27 move relative to each other to clamp the part. When the preset time of the electromagnet 21 ends, the electromagnet 21 is powered off. At this time, the multiple sliding rods 23 are reset, so that the part is clamped. Due to the operation of the vibrating loading tray, the part in the conveying track 19 will automatically move to the right.

[0038] After the part is clamped, the staff controls the second motor 11 to drive the cross bar 18 to rotate 90 degrees again, so that the clamped part will rotate to the right side to align with the milling cutter 28. At the same time, when the cross bar 18 rotates 90 degrees again, one of the induction blocks 17 is close to the proximity sensor 38 again, so that the multiple electromagnets 21 are energized again for a period of time (rotated to the electromagnetic valve in the right short tube 24 is energized and blocked, so that the sliding rod 23 and the part will not move), and rotate to the lower feeding assembly to clamp new parts;

[0039] The staff controls the pneumatic rod 29 to stretch and controls the first motor 7 to operate, so that the milling cutter 28 rotates to perform milling processing on the right part. When the milling is completed, the pneumatic rod 29 is controlled to reset. At this time, the staff controls the second motor 11 to operate again, so that the crossbar 18 rotates 90 degrees again, and the milling processing of the next part is performed in the above manner. In the process of milling, most of the debris generated will fall into the collection box 30;

[0040] During the processing, as the cross bar 18 rotates, the part with the milled hole rotates to the left side to align with the multiple jet tubes 32. When the electromagnet 21 is energized, the sliding rod 23 on the left side moves toward the direction close to the hollow circular plate 31, so that the three jet tubes 32 are close to the milled hole. Since the high-pressure air pump 12 is in operation, a high-pressure airflow is generated and sprayed into the milled hole to blow away the debris adhering to the hole wall.

[0041] After each milling hole is completed, the staff can control the two hydraulic rods 26 on the left to retract, so that under the action of gravity, the cleaned parts will fall on the flip plate 39, and then slide to the front side through the filter 4 for collection. At the same time, the two guard plates 15 are set to prevent the blown debris from falling on the bottom plate 1. At the same time, part of the blown debris will fall on the inner bottom of the L-shaped channel through the filter 4. Since the high-pressure air pump 12 will blow gas into the L-shaped channel, the debris will be ejected through the slag outlet 37. A filter bag can be installed at the slag outlet 37 to collect the debris.

[0042] It is worth mentioning that in the initial state, the flip plate 39 is located below the left rectangular plate 10. When the cross bar 18 rotates, the rotation of the rectangular plate 10 will cause the flip plate 39 to rotate downward. When the rectangular plate 10 is separated from the flip plate 39, the flip plate 39 will be reset, so that the processed parts and debris can slide onto the blanking plate 3.

[0043] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A milling device for a high-voltage eccentric contact seat, comprising a base plate (1), characterized in that: The bottom plate (1) is fixedly connected to a conveying track (19), and openings (41) are provided on both the front and rear sides of the conveying track (19). Two vertical plates (2) and a side plate (6) are fixedly connected to the bottom plate (1), and the side plate (6) is fixedly connected to the right sides of the two vertical plates (2). The adjacent sides of the two vertical plates (2) are rotatably connected to a cross bar (18), and a plurality of loading assemblies are provided on the cross bar (18). A second motor (11) is installed on the vertical plate (2) located at the rear side, and the output shaft end of the second motor (11) is fixedly connected to the cross bar (18); The loading assembly comprises a loading box (20) arranged on the cross bar (18), an electromagnet (21) is embedded in the inner wall of the loading box (20) on one side close to the cross bar (18), a sliding rod (23) is slidably connected in the loading box (20), the sliding rod (23) is elastically connected to the adjacent side of the electromagnet (21) through a spring (22), a rectangular plate (10) is fixedly connected to the side of the sliding rod (23) away from the cross bar (18), two clamping boxes (25) are fixedly connected to the rectangular plate (10), the inner walls of the two clamping boxes (25) on the opposite sides are fixedly connected to hydraulic rods (26), and the telescopic ends of the two hydraulic rods (26) are fixedly connected to clamping blocks (27), a plurality of induction blocks (17) are provided on the cross bar (18), a proximity sensor (38) is installed on the vertical plate (2) located on the front side, and a milling assembly is installed on the side plate (6); The space on one side of each loading box (20) close to the cross bar (18) is connected to the outside through a short tube (24), and a plurality of the short tubes (24) are provided with a solenoid valve. A plurality of conductive rods (33) are fixed to the outer wall of the cross bar (18), and two conductive sheets (34) are installed on the vertical plate (2) located at the rear side. The milling assembly comprises a first motor (7) mounted on the side plate (6), the output shaft of the first motor (7) passing through the side plate (6) and fixedly connected to a pneumatic rod (29), the telescopic end of the pneumatic rod (29) being fixedly connected to a milling cutter (28); The purge assembly further comprises a strip plate (16) fixedly connected to the left side of the two vertical plates (2); a thick tube is rotatably connected to the right side of the strip plate (16); a hollow circular plate (31) is fixedly connected to the right side of the thick tube; a plurality of air injection tubes (32) are fixedly connected to the right side of the hollow circular plate (31); a rotary joint (14) is installed on the left side of the strip plate (16); the left side of the thick tube is connected to the rotary joint (14); a high-pressure air pump (12) is installed on the vertical plate (2) at the rear side; an air outlet of the high-pressure air pump (12) is connected to a three-way pipe; one end of the three-way pipe is connected to the left side of the rotary joint (14).

2. A milling device for high-voltage eccentric contact seat according to claim 1, characterized in that: Two mounting blocks (5) are fixedly connected to the vertical plate (2) located at the front side, and adjacent sides of the two mounting blocks (5) are rotatably connected to a transmission rod (8), the transmission rod (8) is transmission-connected to the pneumatic rod (29) via a first transmission assembly (9), and the transmission rod (8) is transmission-connected to the thick pipe via a second transmission assembly.

3. A milling device for high-voltage eccentric contact seat according to claim 1, characterized in that: A collecting box (30) is provided at the upper end of the bottom plate (1), a material discharge separation assembly is provided between the two vertical plates (2), the material discharge separation assembly comprises a material discharge plate (3) fixed between the two vertical plates (2), the material discharge plate (3) is arranged obliquely, an L-shaped channel is provided at the upper end of the material discharge plate (3), a filter screen (4) is provided in the L-shaped channel, a hollow plate (35) is fixedly connected between the inner bottom of the L-shaped channel and the filter screen (4), a plurality of air outlets are provided on the left side of the hollow plate (35), the hollow plate (35) is connected to the other end of the three-way pipe, and a slag outlet (37) is provided on the right side of the L-shaped channel.

4. A milling device for high-voltage eccentric contact seat according to claim 3, characterized in that: Two fixed blocks are fixedly connected to the right side of the blanking plate (3); adjacent sides of the two fixed blocks are rotatably connected to a rotating shaft; the rotating shaft is elastically connected to the fixed block located at the front side via a torsion spring (40); a flip plate (39) is fixedly connected to the rotating shaft; the upper end of the flip plate (39) is fixedly connected to two guard plates (15); both guard plates (15) are L-shaped.

5. A milling device for high-voltage eccentric contact seat according to claim 1, characterized in that: The plurality of conductive rods (33) and the two conductive sheets (34) form a plurality of conductive switches. A power source is provided on the bottom plate (1). The power source, the plurality of conductive switches and the plurality of solenoid valves form a loop via wires. The plurality of conductive switches and the corresponding solenoid valves form a series circuit. The plurality of series circuits are connected in parallel in the loop.

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