Spacer clamping device

Abstract

The utility model relates to the technical field of power equipment, in particular to a spacer clamping device, which comprises a support frame, two support cross beams arranged on the support frame, two clamping arm structures and a telescopic rod, each clamping arm structure comprises a connecting end rotationally connected with the corresponding support cross beam, a clamping end far away from the connecting end, and a connecting rod connecting the connecting end and the clamping end, the two ends of the telescopic rod are connected with the connecting rods of the two clamping arm structures correspondingly, and the telescopic rod stretches out and draws back to drive the clamping ends of the two clamping arm structures to be close to or away from each other. By adjusting the telescopic rod, the connecting rod is pushed and pulled, so that the opening and closing distance of the clamping end can be controlled, the clamped spacer can be clamped or released, and meanwhile, the spacers of different sizes can be clamped.

Description

Technical Field

[0001] The utility model relates to the technical field of power equipment, and particularly relates to a spacer clamping device.

Background Art

[0002] Spacers are used to be installed on bundled conductors to fix the spacing between each bundled conductor, so as to prevent the conductors from whipping each other, suppressing aeolian vibration and sub-span oscillation. At present, the installation of spacers is usually manual installation, with low installation efficiency and high safety risks. And when using some automatic equipment to assist in installing spacers, full-automatic installation cannot be achieved. One of the reasons is that after the existing spacer is installed, when removing the spacer clamping device, the release of the spacer will be hindered.

Content of the Utility Model

[0003] To solve the technical problem in the prior art that the spacer cannot be automatically released, the utility model provides a spacer clamping device.

[0004] The solution of the utility model to solve the technical problem is to provide a spacer clamping device, which includes a support frame, two support crossbeams arranged on the support frame, two clamping arm structures and a telescopic rod. The clamping arm structure includes a connection end rotatably connected to the support crossbeam, a clamping end far away from the connection end, and a connecting rod connecting the connection end and the clamping end. Two ends of the telescopic rod are respectively connected to the connecting rods of the two clamping arm structures, and the telescopic rod drives the clamping ends of the two clamping arm structures to approach or move away from each other by telescoping.

[0005] Preferably, a clamping space is formed between the clamping ends of the two clamping arm structures and the telescopic rod, and a convex column is arranged on one side of the clamping end facing the clamping space.

[0006] Preferably, a reinforcing plate is arranged between the convex column and the clamping end.

[0007] Preferably, a sleeve is arranged at the connection end, and the sleeve is rotatably sleeved on the support crossbeam.

[0008] Preferably, the telescopic rod is one of an electric telescopic rod or a hydraulic telescopic rod.

[0009] Preferably, a through hole is formed in the connecting rod, a bolt is arranged in the through hole, and the telescopic rod and the connecting rod are fixedly connected through the bolt.

[0010] Preferably, support feet are oppositely arranged on both sides of the support frame, and a reinforcing rod is arranged between the opposite support feet arranged at the edge of the support frame.

[0011] Preferably, the support frame includes a support rod disposed on a side of the support cross beam away from the clamping arm structure, and the support rod and the support cross beam enclose a first space.

[0012] Preferably, the support frame further includes a second space disposed on a side of the support cross beam away from the first space, the bottom of the second space is open, and the clamping arm structure is located in the second space.

[0013] Preferably, the spacer bar clamping device further includes a controller and a driver disposed in the first space, the driver drives the telescopic rod to expand and contract, and the controller is signal-connected to the driver.

[0014] Compared with the prior art, the spacer bar clamping device provided by the present utility model has the following advantages:

[0015] 1. In the spacer bar clamping device provided in the embodiment of the present utility model, the support frame provides overall support and stability. The clamping arm structure is rotatably connected to the support cross beam, and the angle between the clamping arm structures can be adjusted to adapt to the installation of various types of spacer bars. The two ends of the telescopic rod are respectively connected to the connecting rods of the two clamping arm structures. The telescopic rod drives the clamping ends of the two clamping arm structures to approach or move away from each other. By adjusting the telescopic rod, the opening and closing distance of the clamping ends can be controlled, so as to clamp or release the clamped spacer bar, and at the same time, the clamping of spacer bars of different sizes can be realized.

[0016] 2. In the spacer bar clamping device provided in the embodiment of the present utility model, a clamping space is formed between the clamping ends of the two clamping arm structures and the telescopic rod. A convex column is disposed on a side of the clamping end facing the clamping space, and the convex column cooperates with an opening formed on the spacer bar body to increase the clamping stability.

[0017] 3. In the spacer bar clamping device provided in the embodiment of the present utility model, a reinforcing plate is disposed between the convex column and the clamping end to increase the clamping bearing capacity and stability.

[0018] 4. In the spacer bar clamping device provided in the embodiment of the present utility model, a sleeve is disposed at the connection end, and the sleeve is rotatably sleeved on the support cross beam, and can adjust the angle of opening and closing of the two clamping arm structures, which is convenient for clamping or releasing the clamped spacer bar. This structure is simple, light and flexible in operation.

[0019] 5. In the spacer bar clamping device provided in the embodiment of the present utility model, the telescopic rod is one of an electric telescopic rod or a hydraulic telescopic rod. By selecting different types of telescopic rods, more precise and automated clamping control can be realized according to needs.

[0020] 6. In the spacer clamp device provided in the embodiment of the present utility model, a through hole is formed in the connecting rod, a bolt is arranged in the through hole, and the telescopic rod is fixedly connected to the connecting rod through the bolt. This connection method is simple and reliable, enabling the telescopic rod to drive the clamping arm structure to open and close when the telescopic rod expands and contracts.

[0021] 7. In the spacer clamp device provided in the embodiment of the present utility model, support feet are relatively arranged on both sides of the support frame, and a reinforcing rod is arranged between the opposite support feet arranged at the edge of the support frame. The support feet can stably support the entire support frame, and the transmission line can pass through the recessed part between the support feet, enabling the spacer clamp device to clamp the spacer and install it on the transmission line. The arrangement of the reinforcing rod enhances the stability and load-bearing capacity of the support frame.

[0022] 8. In the spacer clamp device provided in the embodiment of the present utility model, the support frame includes a support rod arranged on one side of the support crossbeam away from the clamping arm structure. The support rod and the support crossbeam enclose a first space, and the controller and the driver are arranged in the first space. The driver drives the telescopic rod to expand and contract, and the controller is signal-connected to the driver. The controller and the driver cooperate to enable the telescopic rod to precisely control the movement of the clamping end, adjust the clamping force and position of the clamping device, improve the accuracy and safety of the operation, and realize the automatic clamping and release of the spacer.

[0023] 9. In the spacer clamp device provided in the embodiment of the present utility model, the support frame further includes a second space arranged on one side of the support crossbeam away from the first space. The bottom of the second space is open, and the clamping arm structure is located in the second space. This design further ensures that the spacer is not blocked when released, and the entire spacer clamp device can be removed from above the transmission line after the spacer is installed.

Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 It is a three-dimensional schematic diagram of the spacer.

[0026] Figure 2 It is a three-dimensional schematic diagram of the spacer clamp device provided in the first embodiment of the present utility model clamping the spacer.

[0027] Figure 3 It is a three-dimensional schematic diagram of a partial structure of the spacer clamp device provided in the first embodiment of the present utility model.

[0028] Figure 4It is a three-dimensional schematic diagram of the clamp arm structure of the spacer clamp device provided by the first embodiment of the present utility model.

[0029] Figure 5 It is a three-dimensional schematic diagram of the spacer clamp device provided by the first embodiment of the present utility model.

[0030] Explanation of the attached drawing reference numerals:

[0031] 1. Spacer; 2. Clamping device; 3. Transmission line

[0032] 10. Main body; 11. Line clamp assembly; 12. Opening; 20. Support frame; 21. Support cross beam; 22. Clamp arm structure; 23. Telescopic rod; 24. Clamping space;

[0033] 200. Support foot; 201. Reinforcing rod; 202. Support rod; 203. First space; 204. Second space; 220. Connection end; 221. Clamping end; 222. Link;

[0034] 2000. Depression; 2200. Sleeve; 2210. Convex column; 2211. Reinforcing plate; 2220. Through hole; 2221. Bolt.

Detailed implementation manners

[0035] In order to make the purpose, technical solutions and advantages of the present utility model clearer, the following further details the present utility model in conjunction with the attached drawings and implementation examples. It should be understood that the specific implementation examples described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0036] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration.

[0037] In the present utility model, the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc. is based on the orientation or positional relationship shown in the attached drawings. These terms are mainly used to better describe the present utility model and its embodiments, and are not used to limit that the indicated device, element or component must have a specific orientation, or be constructed and operated in a specific orientation.

[0038] Moreover, in addition to being used to represent orientation or positional relationships, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the present utility model can be understood according to specific circumstances.

[0039] In addition, the terms "installed", "set", "provided with", "connected", and "linked" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there can be internal communication between two devices, components, or parts. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0040] It should be noted that in overhead extra-high voltage power transmission, bundled conductors can significantly reduce the inductance of the transmission line and increase the capacitance compared with single conductors, thereby reducing the wave impedance to alternating current and improving the transmission capacity of the line. However, bundled conductors are prone to galloping under the influence of wind, resulting in excessive wire tension, which may cause fatigue damage, and even lead to the fracture or detachment of the transmission line, or mutual collision. This galloping phenomenon may also cause mechanical damage to transmission equipment such as tower components and insulator strings, and even lead to the collapse of the tower. In order to effectively prevent the galloping of the transmission line, the currently adopted effective solution is to install spacer dampers on the bundled conductors.

[0041] Please refer to Figure 1 , for ease of understanding, the present utility model will explain the spacer damper 1 here. The spacer damper 1 includes a main body 10 and a clamp assembly 11. The clamp assembly 11 is arranged at both ends of the main body 10 and is used to connect and fix the spacer damper 1 to the transmission line 3. An opening 12 is also provided on the main body 10.

[0042] Please refer to Figure 2 and Figure 3 , the first embodiment of the present utility model provides a clamping device 2, which includes a support frame 20, two support crossbeams 21 arranged on the support frame 20, two clamp arm structures 22, and a telescopic rod 23. The clamp arm structure 22 includes a connection end 220 rotatably connected to the support crossbeam 21, a clamping end 221 far from the connection end 220, and a connecting rod 222 connecting the connection end 220 and the clamping end 221. Both ends of the telescopic rod 23 are respectively connected to the connecting rods 222 of the two clamp arm structures 22, and the telescopic movement of the telescopic rod 23 drives the clamping ends 221 of the two clamp arm structures 22 to approach or move away from each other.

[0043] Understandably, the support frame 20 is a frame structure with an open bottom, providing overall support and stability while reducing the overall weight of the clamping device 2. The open-bottom design allows the clamping device 2 to be removed entirely from above the transmission line 3. The overall structure of the support frame 20 can be designed as a detachable structure assembled from multiple mounting rods, facilitating assembly, maintenance, storage, and transportation. Two support crossbeams 21 are arranged in parallel on the support frame 20, providing support for the installation of the clamping arm structure 22. The two clamping arm structures 22 are symmetrically arranged on the two support crossbeams 21, and the clamping arm structure 22 is rotatably connected to the support crossbeam 21. This design can adjust the angle between the clamping arm structures 22 to adapt to the installation of spacer dampers of various types and sizes.

[0044] Understandably, the telescopic rod 23 is fixedly connected to the connecting rod 222. When the telescopic rod 23 expands and contracts, it applies a force to the connecting rod 222 to achieve the pushing and pulling operation of the connecting rod 222. Since the clamping arm structure 22 can rotate around the support crossbeam 21, the opening and closing distance of the clamping end 221 can be controlled, realizing the clamping or release of the clamped spacer damper 1, facilitating the quick installation of the spacer damper 1 on the transmission line 3, and ensuring that the clamping device 2 can be quickly removed from the transmission line 3.

[0045] Specifically, in this embodiment, two connecting rods 222 of each clamping arm structure 22 are arranged in parallel, and two telescopic rods 23 are also correspondingly arranged to ensure the structural stability. The design of the connecting rod 222 can also reduce the weight of the overall device.

[0046] Please refer to Figures 1 to 3 Between the clamping ends 221 of the two clamping arm structures 22 and the telescopic rod 23, a clamping space 24 is formed. On the side of the clamping end 221 facing the clamping space 24, a convex column 2210 is provided.

[0047] Understandably, when the clamping device 2 clamps, the spacer damper 1 is located within the clamping space 24, and the convex column 2210 cooperates with the opening 12 on the spacer damper 1 to stably and firmly clamp the spacer damper 1, preventing the spacer damper 1 from shifting during the clamping and moving process, making the installation of the spacer damper 1 more accurate and convenient.

[0048] Furthermore, a reinforcing plate 2211 is provided between the convex column 2210 and the clamping end 221 to increase the clamping load-bearing capacity and stability of the clamping end 221.

[0049] Understandably, in this embodiment, the shape of the reinforcing plate 2211 is not specifically limited. For example, the reinforcing plate 2211 can be a triangular plate connecting the clamping end 221 and the convex column 2210. The reinforcing plate 2211 should be able to stably connect the convex column 2210 and the clamping end 221 without extending into the clamping space 24 to affect the clamping effect.

[0050] Please continue to refer toFigure 4 The connecting end 220 is provided with a sleeve 2200 which is rotatably sleeved on the support cross beam 21.

[0051] Understandably, the sleeve 2200 is rotatably sleeved on the support cross beam 21, enabling the clamping arm structure 22 to freely rotate around the support cross beam 21. Furthermore, the angle of opening and closing of the two clamping arm structures 22 can be adjusted, facilitating the fixation or release of the clamped spacer 1. This adjustment ability makes the installation, maintenance, and operation more flexible. For example, when it is necessary to replace the sleeve 2200 itself or the support cross beam 21, the operation can usually be carried out relatively easily without disassembling the entire clamping arm structure 22. In addition, the sleeve 2200 has a simple structure and is made of lightweight materials such as alloys or reinforced plastics, reducing the weight of the overall equipment and the additional burden on the support cross beam 21.

[0052] Furthermore, the telescopic rod 23 is one of an electric telescopic rod or a hydraulic telescopic rod. By selecting different types of telescopic rods 23, more precise and automated clamping control can be achieved according to needs.

[0053] Understandably, the hydraulic telescopic rod has a high load-bearing capacity, can withstand large pressures and loads, can precisely control the extension and retraction of the piston, provides highly predictable position control and force output, has a stable and reliable design, and has a long service life. The electric telescopic rod can achieve very precise position control through electronic control, can set specific telescopic lengths and speeds, can be integrated into an automated system, and can achieve automated motion control through programming and sensor feedback, such as automatically adjusting the length, force, or speed. Compared with the hydraulic system, the electric telescopic rod 23 is usually more energy-efficient.

[0054] Furthermore, the connecting rod 222 is provided with a through hole 2220, and a bolt 2221 is arranged in the through hole 2220. The telescopic rod 23 and the connecting rod 222 are fixedly connected by the bolt 2221. This connection method is simple and reliable, enabling the telescopic rod 23 to push and pull the connecting rod 222 during the telescopic movement, thereby driving the clamping arm structure 22 to open and close.

[0055] Specifically, in this embodiment, through holes 2220 are provided in both connecting rods 222 of the same clamping arm structure 22. The two through holes 2220 are correspondingly arranged and communicated. When installing the telescopic rod 23 to the connecting rod 222, this design facilitates positioning, making the installation simpler and more convenient. Moreover, the design of the communicated through holes 2220 can further strengthen the two connecting rods 222 and ensure their stability.

[0056] Please further combine Figure 5 On both sides of the support frame 20, support feet 200 are oppositely arranged, and a reinforcing rod 201 is arranged between the relatively arranged support feet 200 at the edge of the support frame 20.

[0057] Understandably, the supporting feet 200 can stably support the entire support frame 20. The multiple supporting feet 200 are connected in an M shape, and a smooth recess 2000 is formed between the supporting feet 200. The power transmission line 3 can pass through the recess 2000 between the supporting feet 200, enabling the clamping device 2 to clamp the spacer 1 and install it on the power transmission line 3. After the spacer 1 is installed, the support frame 20 can be removed from above the power transmission line 3. The setting of the reinforcing rod 201 enhances the stability and load-bearing capacity of the support frame 20.

[0058] Please continue to refer to Figure 5 , the support frame 20 includes a support rod 202 disposed on the side of the support cross beam 21 away from the clamping arm structure 22. The support rod 202 and the support cross beam 21 enclose a first space 203.

[0059] Furthermore, the clamping device 2 further includes a controller and a driver disposed in the first space 203. The driver drives the telescopic rod 23 to expand and contract, and the controller is signal-connected to the driver.

[0060] Understandably, the support rod 202 can be used to hang devices such as drones for high-altitude operations. The controller, driver, and other circuit structures are all disposed in the first space 203 to prevent affecting the removal of the clamping device 2 after the spacer 1 is installed.

[0061] Understandably, the way the driver drives the telescopic rod 23 to expand and contract can be electric drive or hydraulic drive. It is also possible to select other types of telescopic rods 23 other than the electric telescopic rod 23 and the hydraulic telescopic rod 23, as long as the driver can drive the telescopic rod 23 to achieve automatic expansion and contraction.

[0062] Understandably, the controller and the driver cooperate to enable the telescopic rod 23 to precisely control the movement of the clamping end 221, adjust the clamping force and position of the clamping device 2, improve the accuracy and safety of the operation, and achieve automatic clamping and release of the spacer 1.

[0063] Furthermore, the support frame 20 further includes a second space 204 disposed on the side of the support cross beam 21 away from the first space 203. The bottom of the second space 204 is open, and the clamping arm structure 22 is located in the second space 204. This design further ensures that the spacer 1 is not blocked when released, and the entire clamping device 2 can be removed from above the power transmission line 3 after the spacer 1 is installed.

[0064] Understandably, the support frame 20 is made of lightweight materials as a whole, such as alloys or reinforced plastics. The designs of the first space 203 and the second space 204 further reduce the weight of the overall device.

[0065] Compared with the prior art, the spacer clamp device provided by the utility model has the following advantages:

[0066] 1. In the spacer clamp device provided in the embodiment of the utility model, the support frame provides overall support and stability. The clamp arm structure is rotatably connected to the support cross beam, and the angle between the clamp arm structures can be adjusted to adapt to the installation of various types of spacers. The two ends of the telescopic rod are respectively connected to the connecting rods of the two clamp arm structures. The telescopic rod drives the clamping ends of the two clamp arm structures to approach or move away from each other. Through the adjustment of the telescopic rod, the opening and closing distance of the clamping ends can be controlled, so as to clamp or release the clamped spacer, and at the same time, spacers of different sizes can be clamped.

[0067] 2. In the spacer clamp device provided in the embodiment of the utility model, a clamping space is formed between the clamping ends of the two clamp arm structures and the telescopic rod. A convex column is arranged on the side of the clamping end facing the clamping space, and the convex column cooperates with the opening formed on the spacer body to increase the clamping stability.

[0068] 3. In the spacer clamp device provided in the embodiment of the utility model, a reinforcing plate is arranged between the convex column and the clamping end to increase the clamping load-bearing capacity and stability.

[0069] 4. In the spacer clamp device provided in the embodiment of the utility model, a sleeve is arranged at the connecting end. The sleeve is rotatably sleeved on the support cross beam and can adjust the angle of the opening and closing of the two clamp arm structures, which is convenient for clamping or releasing the clamped spacer. This structure is simple, light and flexible to operate.

[0070] 5. In the spacer clamp device provided in the embodiment of the utility model, the telescopic rod is one of an electric telescopic rod or a hydraulic telescopic rod. By selecting different types of telescopic rods, more precise and automated clamping control can be achieved according to needs.

[0071] 6. In the spacer clamp device provided in the embodiment of the utility model, the connecting rod is provided with a through hole, and a bolt is arranged in the through hole. The telescopic rod and the connecting rod are fixedly connected by the bolt. This connection method is simple and reliable, so that when the telescopic rod expands and contracts, the clamp arm structure can be driven to open and close.

[0072] 7. In the spacer clamp device provided in the embodiment of the utility model, support feet are relatively arranged on both sides of the support frame, and a reinforcing rod is arranged between the opposite support feet arranged at the edge of the support frame. The support feet can stably support the whole support frame, and the transmission line can pass through the recessed part between the support feet, so that the spacer clamp device clamps the spacer and installs it on the transmission line. The arrangement of the reinforcing rod enhances the stability and load-bearing capacity of the support frame.

[0073] 8. The spacer clamp device provided in the embodiment of the present invention, the support frame includes a support rod disposed on the side of the support cross beam away from the clamp arm structure. The support rod and the support cross beam enclose a first space. The controller and the driver are disposed in the first space. The driver drives the telescopic rod to expand and contract. The controller is signal-connected to the driver. The controller and the driver cooperate to enable the telescopic rod to precisely control the movement of the clamping end, adjust the clamping force and position of the clamping device, improve the accuracy and safety of the operation, and realize the automatic clamping and release of the spacer.

[0074] 9. The spacer clamp device provided in the embodiment of the present invention, the support frame further includes a second space disposed on the side of the support cross beam away from the first space. The bottom of the second space is open. The clamp arm structure is located in the second space. This design further ensures that the spacer is not blocked when released, and the entire spacer clamp device can be removed from above the transmission line after the spacer is installed.

[0075] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A spacer rod clamping device, characterized in that: It includes a support frame, two supporting beams arranged on the support frame, two clamping arm structures and a telescopic rod. The clamping arm structure includes a connecting end rotatably connected to the supporting beam, a clamping end away from the connecting end, and a connecting rod connecting the connecting end and the clamping end. The two ends of the telescopic rod are respectively connected to the connecting rods of the two clamping arm structures. The telescopic rod is extended and retracted to drive the clamping ends of the two clamping arm structures to move closer to or away from each other.

2. The spacer rod clamping device according to claim 1, characterized in that: A clamping space is formed between the clamping ends of the two clamping arm structures and the telescopic rod, and a convex column is arranged on one side of the clamping end facing the clamping space.

3. The spacer rod clamping device according to claim 2, characterized in that: A reinforcing plate is arranged between the boss and the clamping end.

4. The spacer rod clamping device according to claim 1, characterized in that: The connecting end is provided with a sleeve, and the sleeve is rotatably sleeved on the supporting crossbeam.

5. The spacer rod clamping device according to claim 1, characterized in that: The telescopic rod is an electric telescopic rod or a hydraulic telescopic rod.

6. The spacer rod clamping device according to claim 1, characterized in that: The connecting rod is provided with a through hole, a bolt is arranged in the through hole, and the telescopic rod is fixedly connected to the connecting rod through the bolt.

7. The spacer rod clamping device according to claim 1, characterized in that: Support feet are arranged opposite to each other on both sides of the support frame, and a reinforcing rod is arranged between the support feet on the edge of the support frame.

8. The spacer rod clamping device according to claim 1, characterized in that: The support frame includes a support rod disposed on a side of the support beam away from the clamp arm structure, and the support rod and the support beam are combined to form a first space.

9. The spacer rod clamping device according to claim 8, characterized in that: The support frame further comprises a second space arranged on a side of the support beam away from the first space, the second space has an open bottom, and the clamping arm structure is located in the second space.

10. The spacer rod clamping device according to claim 8, characterized in that: The spacer rod clamping device also includes a controller and a driver arranged in the first space. The driver drives the telescopic rod to extend and retract. The controller is connected to the driver by signal.

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