Hoisting device capable of self-adapting to gravity center
By integrating level sensors, controllers and drivers in the hoisting device, and automatically adjusting the center of gravity using the adjustment mechanism, the problem of uneven center of gravity during hoisting of special external parts in the prior art is solved, and automatic center of gravity adjustment without additional counterweight is achieved. Improved compatibility.
Patent Information
- Application Number
- CN202411753542.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-02
- Publication Date
- 2025-01-17
AI Technical Summary
When lifting parts with special appearance and uneven center of gravity, existing lifting slings need to be specially designed and added to offset the center of gravity offset, resulting in inconsistent center of gravity.
Design a lifting device that adapts to the center of gravity, including a horizontal sensor, controller and driver in the housing, and automatically adjusts the center of gravity through an adjustment mechanism (including a motor, a screw and a screw linkage assembly), and the clamping assembly is used to clamp parts. And the angle offset signal is detected through the horizontal sensor, and the driver is controlled to adjust the lead screw movement to achieve real-time adjustment of the center of gravity.
It realizes automatic adjustment of the center of gravity without adding additional counterweight, which is suitable for lifting of conventional and special-shaped components, improving compatibility and stability of the lifting process.
Smart Images
Figure CN119320092A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of hoisting, in particular to a hoisting device with adaptive center of gravity. Background Art
[0002] In recent years, with the continuous development of equipment and manufacturing industries, the market demand, types and quality of lifting slings have been continuously improved. In the process of lifting parts, for the lifted parts with special shapes and uneven center of gravity, conventional lifting slings need special design and additional counterweights to offset the inconsistent lifting center of gravity caused by the offset of the center of gravity.
[0003] Therefore, how to provide a lifting device that can automatically adjust the center of gravity is a problem that technical personnel in this field urgently need to solve. Summary of the invention
[0004] In view of this, the present invention provides a hoisting device with an adaptive center of gravity to solve the problem that existing hoisting slings need special design and additional counterweight for hoisted parts with special shapes and uneven centers of gravity.
[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:
[0006] A hoisting device with adaptive center of gravity, comprising:
[0007] A housing, wherein a level sensor, a controller and a driver are arranged in the housing, wherein an input end of the controller is connected to a signal of the level sensor, and an output end of the controller is connected to a signal of the driver, the level sensor is used to receive an angle deviation signal of the hoisting device, and the controller controls the operation of the driver according to the angle deviation signal;
[0008] An adjusting mechanism is arranged inside the housing, the adjusting mechanism comprises a motor, a lead screw and a lead screw linkage assembly, the input end of the motor is connected to the driver, the output end is drivingly connected to the lead screw, the lead screw linkage assembly is rotatably connected to the lead screw and can reciprocate along the axial direction of the lead screw;
[0009] A clamping assembly is arranged outside the shell, one end of the clamping assembly is connected to the lead screw linkage assembly, and the other end is used to clamp the part to be lifted. The clamping assembly is connected to the controller and the controller controls the clamping degree of the clamping assembly.
[0010] Preferably, the lead screw linkage assembly comprises a lead screw linkage block and a connecting assembly;
[0011] The lead screw linkage block is rotatably connected to the lead screw, and the connecting assembly is respectively connected to the lead screw linkage block and the clamping assembly. The lead screw linkage block drives the clamping assembly to perform reciprocating motion along the axial direction of the lead screw through the connecting assembly.
[0012] Preferably, the connection assembly comprises a first connection member and two second connection members;
[0013] The first connecting member is fixed to a side of the lead screw linkage block away from the part to be lifted, and the two second connecting members are symmetrically connected to the two ends of the first connecting member with the axis of the lead screw as the center, and the second connecting members extend toward one side of the part to be lifted and are connected to the clamping assembly.
[0014] Preferably, the connecting assembly further comprises a connecting block, the connecting block is sleeved on the lead screw and fixedly connected to the lead screw linkage block, and the first connecting member is fixed to a side of the connecting block away from the part to be lifted.
[0015] Preferably, the adjustment mechanism further comprises at least one set of sliding components, each set of the sliding components comprises two guide rails and each guide rail is matched with at least one sliding block;
[0016] The shell is provided with a bottom plate, the guide rails are mounted on the bottom plate and symmetrically arranged on both sides of the lead screw, the slider is slidably connected to the guide rail on the side close to the bottom plate, the slider is fixed to the first connecting member on the side away from the bottom plate and a travel sensor is provided on the slider.
[0017] Preferably, the adjustment mechanism further comprises a baffle, the baffle is arranged at an end of the guide rail away from the motor, and the guide rail abuts against the baffle.
[0018] Preferably, the adjustment mechanism further comprises a screw support seat, the screw support seat is mounted on the base plate, the screw support seat is connected to an end of the screw away from the motor, and the screw support seat is located on the inner side of the baffle.
[0019] Preferably, the clamping assembly comprises a supporting frame and a clamping body, one end of the supporting frame is connected to the second connecting member, and the other end is used to fix the clamping body, and the clamping body is used to clamp the part to be lifted.
[0020] Preferably, a support plate is provided inside the shell, the support plate is provided on the top of the adjustment mechanism, and the driver is installed on a side of the support plate away from the adjustment mechanism through a bracket.
[0021] Preferably, it further comprises a handle operating part, wherein the handle operating part is installed on the outside of the shell, and the handle operating part is connected to the controller signal.
[0022] The present invention provides a hoisting device with an adaptive center of gravity, which has the following beneficial effects compared with the prior art:
[0023] The hoisting device of the present invention can automatically adjust the center of gravity during use without adding additional counterweights, can be used for hoisting conventional parts and components, and can also be used for hoisting special-shaped parts, and has good compatibility with the hoisted parts.
[0024] Specifically, when it is necessary to lift parts, the controller controls the clamping assembly to be in an open state, so that the parts to be lifted completely enter the clamping side of the clamping assembly, and then the controller controls the clamping assembly to completely clamp the parts to be lifted, and the lifting device rises. The horizontal sensor will detect that the center of gravity of the lifting device as a whole is biased toward the direction of the parts to be lifted and send an angle offset signal to the controller. After receiving the angle offset signal, the controller controls the operation of the driver, and the driver controls the movement of the lead screw through the motor. Under the action of the lead screw, the lead screw linkage assembly drives the clamping assembly and the parts to be lifted to move toward the opposite side of the center of gravity, so as to achieve the effect of real-time adjustment of the center of gravity. When the angle of the horizontal sensor senses 0°, the parts to be lifted can be lifted horizontally. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.
[0026] Figure 1 It is a structural schematic diagram of a hoisting device with adaptive center of gravity according to an embodiment of the present invention;
[0027] Figure 2 yes Figure 1 Side view of
[0028] Figure 3 yes Figure 1 A top view of
[0029] Figure 4 yes Figure 3 Sectional view along "CC";
[0030] Figure 5 It is a partial structural schematic diagram of a hoisting device with adaptive center of gravity according to an embodiment of the present invention;
[0031] Figure 6 yes Figure 5 A top view of
[0032] Figure 7 yes Figure 5 The main view of
[0033] Figure 8 yes Figure 5 Side view of
[0034] Fig. 9 It is a structural diagram of the fixed support frame.
[0035] In the figure:
[0036] 100-housing, 110-bottom plate, 120-top guard, 130-tailstock guard, 140-motor guard, 150-side guard, 160-fixed support frame, 161-support leg, 162-fixed frame, 170-support plate, 180-lifting ring, 200-level sensor, 300-controller, 400-driver, 410-bracket, 510-motor, 520-screw, 530-screw linkage block, 540-connecting block, 550-first connecting piece, 560-second connecting piece, 571-flange connecting plate, 572-baffle, 573-screw support seat, 581-guide rail, 582-slider, 590-stroke sensor, 600-parts to be lifted, 710-support frame, 720-clamp body, 800-solenoid valve, 910-handle, 920-operating button. DETAILED DESCRIPTION
[0037] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.
[0038] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.
[0039] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.
[0040] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0041] like Figures 1 to 8 As shown, an embodiment of the present invention provides a self-adaptive center-of-gravity hoisting device, including a shell 100, an adjustment mechanism and a clamping assembly.
[0042] Among them, a horizontal sensor 200, a controller 300 and a driver 400 are provided in the shell 100, the input end of the controller 300 is connected to the horizontal sensor 200 signal, and the output end is connected to the driver 400 signal, the horizontal sensor 200 is used to receive the angle deviation signal of the lifting device, and the controller 300 controls the operation of the driver 400 according to the angle deviation signal; the adjustment mechanism is arranged inside the shell 100, the adjustment mechanism includes a motor 510, a screw 520 and a screw linkage assembly, the input end of the motor 510 is connected to the driver 400, and the output end is connected to the screw 520 for driving, the screw linkage assembly is rotatably connected to the screw 520 and can move back and forth along the axial direction of the screw 520; the clamping assembly is arranged outside the shell 100, one end of the clamping assembly is connected to the screw linkage assembly, and the other end is used to clamp the part 600 to be lifted, the clamping assembly is connected to the controller 300 and the controller 300 controls the clamping degree of the clamping assembly.
[0043] When it is necessary to lift parts, the controller 300 controls the clamping assembly to be in an open state, so that the part 600 to be lifted completely enters the clamping side of the clamping assembly, and then the controller 300 controls the clamping assembly to completely clamp the part 600 to be lifted, and the lifting device rises. The horizontal sensor 200 will detect that the center of gravity of the lifting device as a whole is biased toward the direction of the part 600 to be lifted and send an angle offset signal to the controller 300. After receiving the angle offset signal, the controller 300 controls the driver 400 to operate, and the driver 400 controls the movement of the lead screw 520 through the motor 510. Under the action of the lead screw 520, the lead screw linkage assembly drives the clamping assembly and the part 600 to be lifted to move toward the opposite side of the center of gravity, so as to achieve the effect of real-time adjustment of the center of gravity. When the angle of the horizontal sensor 200 is sensed to 0°, the part 600 to be lifted can be lifted horizontally.
[0044] In some embodiments of the present invention, Figures 1 to 4As shown, the shell 100 includes a base plate 110, a top guard 120, a side guard plate, a tailstock guard 130 and a motor guard 140, wherein the base plate 110 is used to install the adjustment structure, the top guard 120 is arranged opposite to the base plate 110, the side guard plate, the tailstock guard 130 and the motor guard 140 form the side wall of the shell 100, and the level sensor 200, the controller 300, the driver 400 and the adjustment mechanism are integrated in the shell 100 for easy maintenance and management.
[0045] Optionally, the side guard plate includes a fixed support frame 160 and a side guard cover 150, such as Fig. 9 As shown, the fixed support frame 160 includes a plurality of support legs 161 and a fixed frame 162. The fixed support frame 160 is fixed to the base plate 110 through the support legs 161. The fixed frame 162 is located on the top of the support legs 161 and is fixedly connected to the top guard 120. Side guards 150 are provided between adjacent support legs 161 to form a complete shell 100, and a plurality of lifting rings 180 are provided on the fixed frame 162. Preferably, the tailstock guard 130, the motor guard 140 and the top guard 120 are all fixed to the fixed support frame 160.
[0046] Optionally, there is no special limitation on the material of the side guard 150, the top guard 120, the tailstock guard 130 and the motor guard 140. Since they will not be directly subjected to force, they are preferably made of thin metal plates. The bottom plate 110 and the fixed support frame 160 are required to fix the adjustment mechanism or the lifting ring 180, so they are preferably made of materials with good load-bearing capacity, such as wooden boards, composite boards, thicker metal plates, etc.
[0047] It can be understood that since the lifting process needs to be implemented with the help of the lifting ring 180, and the lifting ring 180 is connected to the crane lifting chain to realize the lifting process, that is, the lifting ring 180 needs to be subjected to a larger lifting force, based on this, by setting up a fixed support frame 160, the lifting ring 180 can be installed on the fixed frame 162 through pins. At the same time, the shell 100 can withstand a larger lifting force, thereby avoiding damage to the structure of the shell 100 caused by the lifting force.
[0048] Optionally, the fixed support frame 160 is a hollow cubic structure as a whole, and a support plate 170 is provided at the connection between the fixed support frame 160 and the support leg 161, such as Figure 4 As shown, the support plate 170 is disposed on the top of the adjustment mechanism, and the driver 400 is installed on the side of the support plate 170 away from the adjustment mechanism through the bracket 410. Preferably, there is a gap between the bracket 410 and the support plate 170. For example, the bracket 410 can be a hollow structure.
[0049] It can be understood that the driver 400 is installed on the support plate 170 through the bracket 410, so that the driver 400 is not placed directly on the support plate 170, but a certain space is formed between the driver 400 and the support plate 170, thereby improving the heat dissipation capacity of the driver 400 and ensuring the operating effect.
[0050] In some embodiments of the present invention, Figure 4 As shown, the screw linkage assembly includes a screw linkage block 530 and a connecting assembly; the screw linkage block 530 is rotatably connected to the screw 520, and the connecting assembly is respectively connected to the screw linkage block 530 and the clamping assembly. The screw linkage block 530 drives the clamping assembly to move back and forth along the axial direction of the screw 520 through the connecting assembly.
[0051] It can be understood that the screw 520 can convert rotational motion into linear motion. Since the screw linkage block 530 is rotatably connected to the screw 520, the screw 520 can drive the screw linkage block 530 to perform linear motion under the drive of the motor 510 according to the offset direction of the parts to be lifted, and then the screw linkage block 530 drives the connecting assembly and the clamping assembly to perform linear motion to adjust the lifting center of gravity.
[0052] Alternatively, if Figure 4 As shown, the connecting assembly includes a first connecting member 550 and two second connecting members 560; the first connecting member 550 is fixed to the side of the screw linkage block 530 away from the part to be lifted 600, and the two second connecting members 560 are symmetrically connected to the two ends of the first connecting member 550 with the axis of the screw 520 as the center, and the second connecting members 560 extend toward one side of the part to be lifted 600 and are connected to the clamping assembly.
[0053] It can be understood that in order to ensure that the second connecting member 560 is connected to the clamping assembly and enable the clamping assembly to reciprocate with the second connecting member 560, through movable grooves are opened on both sides of the base plate 110 along the axial direction of the screw 520 or there is a gap between the base plate 110 and the side guard plate.
[0054] Alternatively, if Figure 4 As shown, the connecting assembly also includes a connecting block 540, which is sleeved on the screw 520 and fixedly connected to the screw linkage block 530. The first connecting member 550 is fixed to the side of the connecting block 540 away from the part to be lifted 600. Preferably, the connecting block 540, the screw linkage block 530 and the first connecting member 550 are all detachably connected.
[0055] It is understandable that the connecting assembly can be directly fixed to the lead screw linkage block 530 and driven by the lead screw linkage block 530 to move, or can be indirectly fixed to the lead screw linkage block 530 through the connecting block 540, and the lead screw linkage block 530 can sequentially drive the connecting block 540 and the connecting assembly to perform linear motion. By adding the connecting block 540, the direct force of the connecting member on the lead screw linkage block 530 can be avoided, thereby extending the service life of the lead screw linkage block 530.
[0056] Alternatively, if Figure 4 As shown, a flange connecting plate 571 is provided on the side of the lead screw 520 close to the motor 510, the flange connecting plate 571 is fixed to the motor 510 and the lead screw 520 passes through the flange connecting plate 571, the two sides of the bottom of the flange connecting plate 571 extend along the radial direction of the lead screw 520 and abut against the support leg 161, and the end of the guide rail 581 away from the baffle 572 abuts against the flange connecting plate 571, and the flange connecting plate 571 and the baffle 572 respectively limit the two ends of the guide rail 581 to prevent the slider 582 from falling off the guide rail 581.
[0057] In some embodiments of the present invention, Figure 5 As shown, the adjustment mechanism also includes at least one group of sliding components, each group of sliding components includes two guide rails 581 and each guide rail 581 is matched with at least one slider 582; the guide rails 581 are installed on the base plate 110 and are symmetrically arranged on both sides of the lead screw 520, the slider 582 is slidably connected to the guide rail 581 on the side close to the base plate 110, and the slider 582 is fixed to the first connecting member 550 on the side away from the base plate 110 and a stroke sensor 590 is provided on the slider 582, and the stroke sensor 590 is connected to the controller 300 signal.
[0058] It is understandable that by setting the sliding assembly, the connecting assembly can be more flexible to drive the clamping assembly to move and adjust, and by setting the stroke sensor 590 on the slider 582, the safe distance of the clamping assembly displacement can be limited to avoid over-travel hoisting. Specifically, the stroke sensor 590 transmits the stroke information to the controller 300 in real time. If the controller 300 determines that the stroke information exceeds the safety threshold, it controls the driver 400 according to the actual situation, and the driver 400 controls the motor 510 and then controls the lead screw 520 to stop moving in the same direction.
[0059] Alternatively, if Figure 5 As shown, the adjustment mechanism further includes a baffle 572 , which is mounted on the bottom plate 110 . The baffle 572 is disposed at one end of the guide rail 581 away from the motor 510 , and the guide rail 581 abuts against the baffle 572 .
[0060] It can be understood that the baffle 572 acts as a hard limit on the guide rail 581, which can prevent the slider 582 from exceeding the travel range of the guide rail 581, thereby ensuring the safety of the lifting process.
[0061] Alternatively, if Figure 5 As shown, the adjustment mechanism also includes a screw support seat 573, which is installed on the base plate 110, connected to the end of the screw 520 away from the motor 510, and located on the inner side of the baffle 572.
[0062] It can be understood that the setting of the screw support seat 573 can enable the screw linkage block 530 and the connecting block 540 to move back and forth smoothly along the screw 520, and can limit the travel range of the screw linkage block 530 and the connecting block 540.
[0063] In some embodiments of the present invention, Figure 1 As shown, the clamping assembly includes a support frame 710 and a clamp body 720. One end of the support frame 710 is connected to the second connecting member 560, and the other end is used to fix the clamp body 720. The clamp body 720 is used to clamp the part 600 to be lifted.
[0064] Optionally, the clamp body 720 is a cylinder self-centering clamp, such as Figure 6 As shown, the solenoid valve 800 is installed in the housing 100, for example, it can be installed on the support plate 170, and the solenoid valve 800 is connected to the controller 300 by signal. When lifting is required, the controller 300 controls the solenoid valve 800 to ventilate, and the cylinder self-centering clamp opens, so that the part 600 to be lifted is completely immersed in the cylinder self-centering clamp, and then controls the solenoid valve 800 to exhaust, and the cylinder self-centering clamp clamps the part 600 to be lifted.
[0065] In some embodiments of the present invention, Figure 1 , Figure 5 As shown, it also includes a handle 910 operating part, which includes a handle 910 and an operating button 920. The handle 910 is installed on the outside of the shell 100, specifically, on the outside of the fixed support frame 160. The operating button 920 is installed on the handle 910 and the operating button 920 is connected to the controller 300 signal.
[0066] It can be understood that the operation button 920 includes at least a release button and a clamping button, wherein the release button is used to control the ventilation of the solenoid valve 800 so that the cylinder self-centering clamp gradually opens, and the clamping button is used to control the exhaust of the solenoid valve 800 so that the cylinder self-centering clamp clamps the part 600 to be lifted.
[0067] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.
Claims
1. A hoisting device with adaptive center of gravity, characterized in that: include: A housing, wherein a level sensor, a controller and a driver are arranged in the housing, wherein an input end of the controller is connected to a signal of the level sensor, and an output end of the controller is connected to a signal of the driver, the level sensor is used to receive an angle deviation signal of the hoisting device, and the controller controls the operation of the driver according to the angle deviation signal; An adjusting mechanism is arranged inside the housing, the adjusting mechanism comprises a motor, a lead screw and a lead screw linkage assembly, the input end of the motor is connected to the driver, the output end is drivingly connected to the lead screw, the lead screw linkage assembly is rotatably connected to the lead screw and can reciprocate along the axial direction of the lead screw; A clamping assembly is arranged outside the shell, one end of the clamping assembly is connected to the lead screw linkage assembly, and the other end is used to clamp the part to be lifted. The clamping assembly is connected to the controller and the controller controls the clamping degree of the clamping assembly.
2. The self-adaptive center of gravity hoisting device according to claim 1, characterized in that: The lead screw linkage assembly comprises a lead screw linkage block and a connecting assembly; The lead screw linkage block is rotatably connected to the lead screw, and the connecting assembly is respectively connected to the lead screw linkage block and the clamping assembly. The lead screw linkage block drives the clamping assembly to perform reciprocating motion along the axial direction of the lead screw through the connecting assembly.
3. The self-adaptive center of gravity hoisting device according to claim 2, characterized in that: The connecting assembly includes a first connecting member and two second connecting members; The first connecting member is fixed to a side of the lead screw linkage block away from the part to be lifted, and the two second connecting members are symmetrically connected to the two ends of the first connecting member with the axis of the lead screw as the center, and the second connecting members extend toward one side of the part to be lifted and are connected to the clamping assembly.
4. The self-adaptive center-of-gravity hoisting device according to claim 3, characterized in that: The connecting assembly also includes a connecting block, which is sleeved on the lead screw and fixedly connected to the lead screw linkage block, and the first connecting member is fixed to a side of the connecting block away from the part to be lifted.
5. The self-adaptive gravity center hoisting device according to claim 3 or 4, characterized in that: The adjustment mechanism further comprises at least one set of sliding components, each set of the sliding components comprises two guide rails and each guide rail is matched with at least one sliding block; The shell is provided with a bottom plate, the guide rails are mounted on the bottom plate and symmetrically arranged on both sides of the lead screw, the slider is slidably connected to the guide rail on the side close to the bottom plate, the slider is fixed to the first connecting member on the side away from the bottom plate and a travel sensor is provided on the slider.
6. The self-adaptive gravity center hoisting device according to claim 5, characterized in that: The adjustment mechanism further comprises a baffle, which is arranged at one end of the guide rail away from the motor, and the guide rail abuts against the baffle.
7. The self-adaptive center-of-gravity hoisting device according to claim 6, characterized in that: The adjustment mechanism also includes a screw support seat, which is installed on the base plate, connected to an end of the screw away from the motor, and located on the inner side of the baffle.
8. The self-adaptive gravity center hoisting device according to claim 3 or 4, characterized in that: The clamping assembly includes a supporting frame and a clamping body. One end of the supporting frame is connected to the second connecting member, and the other end is used to fix the clamping body. The clamping body is used to clamp the part to be lifted.
9. The self-adaptive gravity center hoisting device according to claim 1, characterized in that: A support plate is arranged inside the shell, and the support plate is arranged on the top of the adjustment mechanism. The driver is installed on a side of the support plate away from the adjustment mechanism through a bracket.
10. The self-adaptive gravity center hoisting device according to claim 1, characterized in that: It also includes a handle operating part, which is installed on the outside of the shell and is connected to the controller signal.