CN210305960U

CN210305960U - Electric heating tube pipe cutting machine

Info

Publication number: CN210305960U
Application number: CN201920931995.1U
Authority: CN
Inventors: 姚锦辉; 李周文; 麦建明
Original assignee: Foshan Mingxinglong Technology Development Co ltd
Current assignee: Foshan Mingxinglong Technology Development Co ltd
Priority date: 2019-06-20
Filing date: 2019-06-20
Publication date: 2020-04-14
Anticipated expiration: 2029-06-20

Abstract

The utility model belongs to the technical field of thin wall tubular product cutter and specifically relates to an electrothermal tube tubular product cutter, including frame, controller, conveyor, rotary device, cutting device, separator and length adjustment device, cutting device includes the first cylinder that cutter and drive cutter removed, and the distance of the cutting edge up end of cutter to the minimum of tubular product is 1-1.5 times of tubular product wall thickness. The cutter of the electric heating tube pipe cutting machine extrudes the outer wall of the pipe in the cutting process, the contact part of the pipe and the cutter is deformed and broken, the pipe at the rear side of the cutter is connected with the pipe at the front side of the cutter after the pipe is cut, the requirement on the separation degree of the cutter is lower, the service life of the cutter is prolonged, and the waiting time for replacing the cutter by equipment is reduced; the pipe stops rotating after being cut, and the collision block collides with the outer wall of the pipe to damage the pipe at the rear side of the cutter and the pipe at the front side of the cutter to exert force between molecules, so that the pipe at the rear side of the cutter is separated from the pipe at the front side of the cutter.

Description

Electric heating tube pipe cutting machine

Technical Field

The utility model belongs to the technical field of thin wall tubular product cutter and specifically relates to an electrothermal tube tubular product cutter.

Background

The electrothermal tube is an electric element specially converting electric energy into heat energy, and is characterized by that it uses metal tube as shell, and in the metal tube an electrothermal element is mounted, and the gap between the metal tube and electrothermal element is filled with insulating heat-conducting powder. The metal pipe is a thin-wall pipe, the pipe needs to be cut into pipes with required lengths, and then the electric heating element is installed in the metal pipe.

The tubular product cutting machine of the electric heating tube in the prior art is provided with a rotating device and a cutting device, wherein the rotating device clamps a tubular product to rotate firstly, and a cutter of the cutting device cuts the rotating tubular product. The cutting mode has high requirement on the sharpness of the cutter, the cutter is unsmooth after being cut for several times and cannot separate the pipe, the cutter needs to be replaced frequently by the cutting device, the service life of the cutter is short, and the waiting time of equipment is long. Therefore, there is a need for an electric heating tube cutting machine without frequent replacement of the cutter, which can prolong the service life of the cutter and reduce the waiting time of the equipment.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a tubular product cutter of electrothermal tube is provided, need not frequently to change the cutter, can improve the life of cutter and reduce the latency of equipment.

The utility model discloses an electrothermal tube pipe cutting machine, including frame, controller, the conveyor who is used for driving tubular product horizontal transport, be used for driving tubular product around the rotating device of tubular product axle center rotation, be used for carrying out the cutting device of cutting to tubular product, be used for the separator that separates out with the tubular product after the cutting and be used for limiting the length adjustment device that tubular product cut off length, conveyor, rotating device, cutting device, separator and length adjustment device set gradually in the frame along the direction of delivery of tubular product, and length adjustment device installs in the frame along the direction of delivery position adjustable ground of tubular product;

the cutting device comprises a cutter and a first cylinder for driving the cutter to move along the direction vertical to the axis of the pipe, and the distance from the upper end surface of the cutting edge of the cutter to the lowest point of the pipe is 1-1.5 times of the wall thickness of the pipe; the separating device comprises an impact block for impacting the outer wall of the pipe on the rear side of the cutting device and a second air cylinder for driving the impact block to move up and down; the conveying device, the rotating device, the first air cylinder and the second air cylinder are all electrically connected with the controller.

As an improvement of the above scheme, the cutting device further comprises a cutter holder for mounting a cutter, wherein the cutter holder is mounted at the output end of the first air cylinder; the tool apron is provided with a tool groove for adjusting the vertical position of the tool and a first locking bolt for locking the position of the tool.

As an improvement of the above scheme, the length adjusting device comprises an adjusting seat slidably mounted on the frame, a second locking bolt for locking the position of the adjusting seat, and a first baffle plate mounted on the adjusting seat, wherein the first baffle plate is used for limiting the rear end of the pipe.

As an improvement of the above scheme, the length adjusting device further comprises a first photoelectric switch for detecting whether the adjusting seat has a pipe, two first rollers for supporting the pipe, a second roller for clamping the pipe in cooperation with the first rollers, and a third cylinder for driving the second roller to move up and down, wherein the first rollers are rotatably connected with the adjusting seat, the second roller is rotatably connected with an output end of the third cylinder, and the first photoelectric switch and the third cylinder are electrically connected with the controller.

As an improvement of the above scheme, the conveying device comprises a third roller rotatably connected with the rack, a first motor driving the third roller to rotate, a fourth roller arranged right above the third roller and a fourth cylinder driving the fourth roller to move up and down, the fourth roller is rotatably connected with the output end of the fourth cylinder, and the first motor and the fourth cylinder are rotatably connected with the controller.

As an improvement of the above scheme, two third rollers are arranged, and the heights of the two third rollers are the same; the number of the fourth rollers is two, the heights of the fourth rollers are the same, and the fourth cylinder drives the two fourth rollers to synchronously lift.

As an improvement of the above scheme, the conveying device further comprises a second photoelectric switch for detecting whether a pipe enters the conveying device, the second photoelectric switch is arranged between the two fourth rollers, and the second photoelectric switch is electrically connected with the controller.

As an improvement of the above scheme, the rotating device includes a roller rotatably connected to the frame, a second motor driving the roller to rotate, and a pneumatic chuck for clamping the pipe, the roller is provided with a through hole for the pipe to pass through, the pneumatic chuck includes a fixing portion and a clamping portion capable of rotating relative to the fixing portion, the clamping portion is installed at one end of the roller, the axis of the clamping portion coincides with the axis of the roller, and the second motor and the pneumatic chuck are both electrically connected to the controller.

As the improvement of the above scheme, the utility model discloses an electrothermal tube tubular product cutter is still including setting up at the tubular product frame of frame front side and with the advancing device in the tubular product frame bottom tubular product impels conveyor, tubular product frame is equipped with a blowing inclined plane and prevents the second baffle of tubular product from the inclined plane bottom landing, advancing device sets up at tubular product frame front end, advancing device is including the push pedal that is used for promoting the tubular product front end and the fifth cylinder that drives the push pedal back-and-forth movement, fifth cylinder and controller electric connection.

Implement the utility model discloses, following beneficial effect has:

the cutter of the electric heating tube pipe cutting machine extrudes the outer wall of the pipe in the cutting process, the contact part of the pipe and the cutter is deformed and broken, the pipe at the rear side of the cutter is connected with the pipe at the front side of the cutter after the pipe is cut, the requirement on the separation degree of the cutter is lower, the service life of the cutter is prolonged, and the waiting time for replacing the cutter by equipment is reduced; the pipe stops rotating after being cut, and the collision block collides with the outer wall of the pipe to damage the pipe at the rear side of the cutter and the pipe at the front side of the cutter to exert force between molecules, so that the pipe at the rear side of the cutter is separated from the pipe at the front side of the cutter.

Drawings

FIG. 1 is a schematic structural view of a cutting machine according to an embodiment of the present invention;

fig. 2 is a schematic view of a cutting device for cutting a pipe in an embodiment of the present invention;

FIG. 3 is a schematic view of an embodiment of the present invention, in which a cutting device is used in conjunction with a separating device to cut a pipe;

FIG. 4 is a schematic view of the first roller cooperating with the second roller to clamp the tube according to the embodiment of the present invention;

fig. 5 is a schematic view of the embodiment of the present invention for placing the tube on the tube rack.

In the figure: 1. a frame; 2. a controller; 3. a conveying device; 4. a rotating device; 5. a cutting device; 6. a separation device; 7. a length adjustment device; 51. a cutter; 52. a first cylinder; 61. a collision mass; 62. A second cylinder; 53. a tool apron; 531. a cutter groove; 532. a first locking bolt; 71. a first baffle plate; 72. An adjusting seat; 73. a second locking bolt; 74. a first photoelectric switch; 75. a first roller; 76. a second roller; 77. a third cylinder; 31. a third roller; 32. a first motor; 33. a fourth roller; 34. A fourth cylinder; 35. a second photoelectric switch; 41. a drum; 42. a second motor; 43. a pneumatic chuck; 8. a pipe rack; 9. a propulsion device; 81. discharging an inclined plane; 82. a second baffle; 91. pushing the plate; 92. A fifth cylinder; 10. a pipe.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and specific embodiments so as to more clearly understand the technical idea claimed in the present invention. Only this statement, the utility model discloses the upper and lower, left and right, preceding, back, inside and outside etc. position words that appear or will appear in the text only use the utility model discloses an attached drawing is the benchmark, and it is not right the utility model discloses a concrete restriction.

As shown in fig. 1-5, an embodiment of the present invention provides an electric heating tube cutting machine, including a frame 1, a controller 2, a conveying device 3 for driving a tube 10 to be horizontally conveyed, a rotating device 4 for driving the tube 10 to rotate around an axis of the tube 10, a cutting device 5 for cutting the tube 10, a separating device 6 for separating the tube 10 on the rear side of the cutting, and a length adjusting device 7 for limiting the cut length of the tube 10, wherein the conveying device 3, the rotating device 4, the cutting device 5, the separating device 6, and the length adjusting device 7 are sequentially arranged on the frame 1 along the conveying direction of the tube 10, and the length adjusting device 7 is adjustably mounted on the frame 1 along the conveying direction of the tube 10. The utility model provides an electrothermal tube tubular product cutter is earlier according to the distance between 10 length adjustment of tubular product length adjustment device 7 and the cutting device 5 as required before cutting off tubular product 10 to injecing the length of cutting off of tubular product 10, ensure that the tubular product 10 that cuts off at every turn is unanimous. When the pipe cutting machine works, the controller 2 controls the conveying device to be pneumatic, the pipe 10 enters the conveying device 3 from the front of the rack 1, the conveying device 3 drives the pipe 10 to move backwards, after the pipe 10 touches the length adjusting device 7, the length adjusting device 7 sends a signal to the controller 2, the controller 2 controls the rotating device 4 to clamp the pipe 10 and drive the pipe 10, the cutting device 5 cuts the pipe 10 in rotation, when the cutting device 5 is in place, the separating device 6 collides the outer wall of the pipe 10 to separate the pipe 10 on the rear side of the cutting device, the electric heating pipe finishes one-time cutting operation of the cutting machine and enters the next working cycle, and the second pipe 10 is cut after the first pipe 10 is cut.

The cutting device 5 includes a cutter 51 and a first cylinder 52 for driving the cutter 51 to move in a direction perpendicular to the axis of the pipe 10. When the pipe 10 is cut, the first cylinder 52 drives the cutter 51 to horizontally move the pipe 10 which rotates tangentially, in order to enhance the cutting effect, the feeding direction of the cutter 51 is preferably opposite to the rotation direction of the pipe 10, and since the cutter 51 presses the outer wall of the pipe 10 during the cutting process, the contact part of the pipe 10 and the cutter 51 is deformed and broken. The tubular product 10 of the electric heating tube mostly adopts stainless steel tubes or copper tubes, the distance from the upper end surface of the blade of the cutter 51 to the lowest point of the tubular product 10, namely the depth of the cutter 51 entering the cross section of the tubular product 10, is deeper because the copper tube is softer than the stainless steel tube, in order to make the contact part of the copper tube and the cutter 51 deform and break, the depth of the cutter 51 entering the cross section of the copper tube should be deeper, in the production process, no matter the tubular product 10 adopts the stainless steel tube or the copper tube, the distance from the upper end surface of the blade of the cutter 51 to the lowest point of the tubular product 10 is 1-1.5 times of the wall thickness of the tubular product 10, the tubular product 10 can deform and break, the tubular products 10 at the front side and the rear side of the cutter 51 are also connected together, when the depth of the cutter 51 entering the cross section of the tubular product 10 is 1 time of the wall thickness of the tubular product, the, less force is required to separate the tube 10 at the rear side of the cutter 51 from the tube 10 at the front side of the cutter 51. In this cutting manner, the pipe 10 behind the cutter 51 after the pipe 10 is cut is connected with the pipe 10 in front of the cutter 51, and compared with the prior art in which the cutter 51 needs to be inserted into the cross section of the pipe 10, the requirement on the separation degree of the cutter 51 is lower, and the service life of the cutter 51 is longer.

The separating device 6 includes an impact block 61 for impacting the outer wall of the pipe 10 on the rear side of the cutting device 5 and a second cylinder 62 for driving the impact block 61 to move up and down. In order to separate the tube 10 at the rear side of the cutter 51 from the tube 10 at the front side of the cutter 51, after the tube 10 is cut, the rotation is stopped, and then the collision block 61 is driven by the second cylinder 62 to move downwards and collide with the outer wall of the tube 10, because the tube 10 at the rear side of the cutter 51 is connected with the tube 10 at the front side of the cutter 51 under the intermolecular force, the tube 10 at the rear side of the cutter 51 is broken by the collision block 61 and the outer wall of the tube 10, and the tube 10 at the front side of the cutter 51 is separated from the tube 10 at the front side of the cutter 51 by the intermolecular force between the tube 10 at the rear side of the cutter 51 and the tube 10 at the front. Conveyor 3, rotary device 4, first cylinder 52 and second cylinder 62 all with controller 2 electric connection, the utility model discloses an electrothermal tube tubular product cutter passes through controller 2 control conveyor 3, rotary device 4, first cylinder 52 and second cylinder 62, controller 2 adopts PLC, can carry out logical operation, sequence control, regularly, count to control the work of each part.

The utility model provides an electrothermal tube tubular product 10 cutting machine cutter 51 extrudees tubular product 10 outer wall in the cutting process, and tubular product 10 takes place to warp the fracture with cutter 51 contact department, and tubular product 10 and the tubular product 10 of cutter 51 front side behind the tubular product 10 cutting back cutter 51 are connected together, and the separation degree requirement to cutter 51 is lower, and the life of cutter 51 improves, reduces the latency of equipment change cutter 51; after the pipe 10 is cut, the rotation is stopped, and the collision block 61 collides with the outer wall of the pipe 10 to break the pipe 10 at the back side of the cutter 51 and the pipe 10 at the front side of the cutter 51 under the action of molecules, so that the pipe 10 at the back side of the cutter 51 is separated from the pipe 10 at the front side of the cutter 51.

Specifically, in order to make the position of the knife 51 adjustable up and down, the cutting device 5 further comprises a knife holder 53 for mounting the knife 51, the knife holder 53 is provided with a knife groove 531 for adjusting the up and down position of the knife 51 and a first locking bolt 532 for locking the position of the knife 51, and the user can adjust the up and down position of the knife 51 according to the material of the pipe 10. The fixed seat of the first cylinder 52 is installed on the frame 1, and the tool holder 53 is installed at the output end of the first cylinder 52. The first cylinder 52 is connected with compressed air and has a telescopic function in cooperation with the controller 2, when cutting is needed, the first cylinder 52 extends outwards, when cutting is not needed, the first cylinder 52 retracts inwards, and the pipe 10 is prevented from being blocked.

The length adjusting device 7 includes an adjusting seat 72 slidably mounted on the frame 1, a second locking bolt 73 for locking the position of the adjusting seat 72, and a first blocking plate 71, and the first blocking plate 71 is used for limiting the rear end of the pipe 10. The distance between the front surface of the first baffle and the rear side surface of the cutter 51 is the cutting length of the pipe 10, and the cutting length of the pipe 10 can be adjusted by adjusting the position of the adjusting seat 72 and driving the first baffle 71 to move.

Further, the length adjusting device 7 preferably further includes a first photoelectric switch for detecting whether the tube 10 is on the adjusting seat 72, two first rollers 75 for supporting the tube 10, a second roller 76 for clamping the tube 10 in cooperation with the first rollers 75, and a third cylinder 77 for driving the second roller 76 to move up and down, the first photoelectric switch is mounted on the adjusting seat 72, a fixing seat of the third cylinder 77 is mounted on the adjusting seat 72, the two first rollers 75 are both rotatably connected with the adjusting seat 72, the second roller 76 is rotatably connected with an output end of the third cylinder 77, and the first photoelectric switch and the third cylinder 77 are both electrically connected with the controller 2. The rear end of the pipe 10 firstly collides with the first baffle 71 through the first photoelectric switch, and when the first photoelectric switch detects that the pipe 10 is arranged on the adjusting seat 72, the controller 2 is used for judging that the rear end of the pipe 10 is limited by the delay function. After the pipe 10 is limited, the conveying device 3 stops operating, the rotating device 4 clamps the pipe 10, the third cylinder 77 drives the second roller 76 to move downwards to match with the first roller 75 to clamp the pipe 10, and the first roller 75 and the second roller 76 can rotate freely, so that the pipe 10 drives the first roller 75 and the drop roller to rotate when rotating, and the effect of preventing the rear end of the pipe 10 from warping upwards is achieved when the cutter 51 cuts the pipe.

Specifically, the conveying device 3 preferably includes a third roller 31 rotatably connected to the frame 1, a first motor 32 driving the third roller 31 to rotate, a fourth roller 33 disposed directly above the third roller 31, and a fourth cylinder 34 driving the fourth roller 33 to move up and down, a fixing seat of the first motor 32 is mounted on the frame 1, a fixing seat of the fourth cylinder 34 is mounted on the frame 1, the fourth roller 33 is rotatably connected to an output end of the fourth cylinder 34, the first motor 32 and the fourth cylinder 34 are both rotatably connected to the controller 2, and after the pipe 10 enters the upper portion of the third roller, the fourth roller 33 moves down and cooperates with the third roller 31 to clamp the pipe 10 and drive the pipe 10 to convey from front to back.

Specifically, two third rollers 31 are provided, and the heights of the two third rollers 31 are the same; the number of the fourth rollers 33 is two, the heights of the fourth rollers 33 are the same, the fourth cylinder 34 drives the two fourth rollers 33 to synchronously lift, and the two groups of third rollers 31 and the four fourth rollers 33 are arranged side by side to ensure that the pipe 10 linearly moves backwards in the horizontal direction.

Further, the conveying device 3 further comprises a second photoelectric switch 3574 for detecting whether the tube 10 enters the conveying device 3, the second photoelectric switch 3574 is arranged between the two fourth rollers 33, the second photoelectric switch 3574 is installed on the rack 1, the second photoelectric switch is electrically connected with the controller 2, and when the second photoelectric switch 3574 detects that the tube 10 enters the conveying device 3, the fourth cylinder 34 drives the fourth rollers 33 to move downwards; when the second photoelectric switch 3574 detects that there is no tube 10, the fourth cylinder 34 drives the fourth roller 33 to move up until the next tube 10 enters the conveying device 3.

Specifically, the rotating device 4 preferably includes a roller 41 rotatably connected to the frame 1, a second motor 42 driving the roller to rotate, and a pneumatic chuck 43 for clamping the pipe 10, the roller 41 is rotatably connected to the frame 1 through a bearing, the roller 41 is provided with a through hole for the pipe 10 to pass through, the pneumatic chuck 43 includes a fixing portion and a clamping portion capable of rotating relative to the fixing portion, the clamping portion is installed at one end of the roller 41, an axis of the clamping portion coincides with an axis of the roller 41, and the second motor 42 and the pneumatic chuck 43 are both electrically connected to the controller 2, so that the rotating device 4 has functions of clamping the pipe 10, driving the pipe 10 to rotate, and loosening the pipe 10.

Specifically, the utility model discloses an electrothermal tube tubular product cutter is still including setting up at the tubular product frame 8 of frame 1 front side and advancing the advancing device 9 among the conveying device 3 with tubular product frame 8 below tubular product 10, tubular product frame 8 is equipped with a blowing inclined plane 81 and prevents tubular product 10 from the second baffle 82 of inclined plane lower extreme landing, advancing device 9 sets up at tubular product frame 8 front end, advancing device 9 is including the push pedal 91 that is used for promoting tubular product 10 front end and the fifth cylinder 92 that drives push pedal 91 back-and-forth movement, fifth cylinder 92 sets up on tubular product frame 8, fifth cylinder 92 and 2 electric connection of controller, advancing device 9 pushes away tubular product 10 below tubular product frame 8 to conveying device 3 in at every turn, the automatic feeding of tubular product 10.

The above is only the concrete embodiment of the present invention, and not therefore the limit of the patent scope of the present invention, all the equivalent structures or equivalent flow changes made by the contents of the specification and the drawings, or directly or indirectly applied to other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. An electric heating tube pipe cutting machine is characterized in that: the pipe cutting machine comprises a rack, a controller, a conveying device, a rotating device, a cutting device, a separating device and a length adjusting device, wherein the conveying device is used for driving a pipe to be horizontally conveyed, the rotating device is used for driving the pipe to rotate around the axis of the pipe, the cutting device is used for cutting the pipe, the separating device is used for separating the cut pipe, and the length adjusting device is used for limiting the cutting length of the pipe;

the cutting device comprises a cutter and a first cylinder for driving the cutter to move along the direction vertical to the axis of the pipe, and the distance from the upper end surface of the cutting edge of the cutter to the lowest point of the pipe is 1-1.5 times of the wall thickness of the pipe;

the separating device comprises an impact block for impacting the outer wall of the pipe on the rear side of the cutting device and a second air cylinder for driving the impact block to move up and down;

the conveying device, the rotating device, the first air cylinder and the second air cylinder are all electrically connected with the controller.

2. The electric heating tube cutting machine as claimed in claim 1, wherein: the cutting device also comprises a cutter holder for mounting a cutter, and the cutter holder is mounted at the output end of the first air cylinder; the tool apron is provided with a tool groove for adjusting the vertical position of the tool and a first locking bolt for locking the position of the tool.

3. The electric heating tube cutting machine as claimed in claim 1, wherein: the length adjusting device comprises an adjusting seat slidably mounted on the rack, a second locking bolt used for locking the position of the adjusting seat and a first baffle mounted on the adjusting seat, and the first baffle is used for limiting the rear end of the pipe.

4. The electric heating tube cutting machine as claimed in claim 3, wherein: the length adjustment device is still including the first photoelectric switch that is used for detecting whether have tubular product on the adjustment seat, two first gyro wheels that are used for bearing tubular product, the third cylinder that is used for coordinating the second gyro wheel of first gyro wheel clamp tight tubular product and drives the second gyro wheel and reciprocates, two first gyro wheel all rotates with the adjustment seat to be connected, the second gyro wheel rotates with the output of third cylinder to be connected, first photoelectricity is opened light and the third cylinder all with controller electric connection.

5. The electric heating tube cutting machine as claimed in claim 1, wherein: the conveying device comprises a third roller, a first motor, a fourth roller and a fourth cylinder, wherein the third roller is rotatably connected with the rack, the first motor drives the third roller to rotate, the fourth roller is arranged right above the third roller, the fourth cylinder drives the fourth roller to move up and down, the fourth roller is rotatably connected with the output end of the fourth cylinder, and the first motor and the fourth cylinder are rotatably connected with the controller.

6. The electric heating tube cutting machine as claimed in claim 5, wherein: two third rollers are arranged, and the heights of the two third rollers are the same; the number of the fourth rollers is two, the heights of the fourth rollers are the same, and the fourth cylinder drives the two fourth rollers to synchronously lift.

7. The electric heating tube pipe cutting machine according to claim 5, wherein: the conveying device further comprises a second photoelectric switch used for detecting whether the pipe enters the conveying device or not, the second photoelectric switch is arranged between the two fourth rollers, and the second photoelectric switch is electrically connected with the controller.

8. The electric heating tube cutting machine as claimed in claim 1, wherein: the rotary device comprises a roller, a second motor and a pneumatic chuck, wherein the roller is connected with the rack in a rotating mode, the second motor is used for driving the second motor to roll and rotate, the pneumatic chuck is used for clamping pipes, the roller is provided with a through hole for the pipes to pass through, the pneumatic chuck comprises a fixing portion and a clamping portion, the fixing portion can rotate relative to the clamping portion, the clamping portion is installed at one end of the roller, the axis of the clamping portion coincides with the axis of the roller, and the second motor and the pneumatic chuck are both electrically connected with the controller.

9. A machine for cutting electric heating tube material according to any one of claims 1-8, wherein: the pipe pushing device is arranged at the front end of the pipe frame and comprises a push plate used for pushing the front end of the pipe and a fifth cylinder driving the push plate to move back and forth, and the fifth cylinder is electrically connected with the controller.