A flexible gripper

Abstract

The utility model provides a kind of flexible gripper, it includes fixed base and clamping device, clamping device includes mounting seat and clamping component, mounting seat is provided with through-hole and first through slot, clamping component includes first clamping arm, second clamping arm, fixed column, first connecting arm and second connecting arm, and magnetic ring installed on fixed column, external magnetic force inductor is located in the side of flexible gripper.The utility model's flexible gripper, it is moved by fixed column and drives magnetic ring to move, simultaneously, fixed column drives first connecting arm and second connecting arm respectively and drives first clamping arm and second clamping arm relative movement clamping article, magnetic force inductor senses the position of magnetic ring movement to detect whether first clamping arm and second clamping arm clamping article or miss clamping article, to improve the accuracy of flexible gripper clamping article.

Description

Technical Field

[0001] This utility model relates to the field of robotic arm technology, and in particular to a flexible gripper. Background Technology

[0002] Flexible grippers are robotic end effectors that utilize elastomers, fluids, or smart materials as deformable elements. During gripping, they can adaptively envelop workpieces of different shapes and sizes through compliant deformation of their structure or materials, significantly reducing contact stress. Flexible grippers offer advantages such as strong shape adaptability, no need for frequent shape changes, and low requirements for workpiece materials, and are increasingly being applied to gripping and handling in precision or fragile scenarios such as 3C electronics, food packaging, medical devices, and new energy batteries. However, existing flexible grippers lack structural designs that sense the gripping status, making it easy for them to miss or grab too many items during gripping.

[0003] Therefore, a flexible gripper is needed to solve the above-mentioned technical problems. Utility Model Content

[0004] This invention provides a flexible gripper that solves the problem that existing flexible grippers are prone to missing or grabbing too many items and have low gripping accuracy.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows: a flexible gripper, including a fixed base and a clamping device connected below the fixed base. The fixed base has a cavity. The clamping device includes a mounting base connected to the bottom of the fixed base and a clamping assembly. The mounting base has a through hole and a first through groove. The through hole extends along the height direction of the mounting base and communicates with the cavity. The first through groove extends along the length direction of the mounting base and communicates with the through hole. The clamping assembly includes a first clamping arm and a second clamping arm located in the first through groove, a fixed post located between the cavity and the through hole and movable between the through hole and the cavity, a first connecting arm with both ends rotatably connected to the fixed post and the first clamping arm respectively, a second connecting arm with both ends rotatably connected to the fixed post and the second clamping arm respectively, and a magnetic ring mounted on the fixed post. A magnetic sensor for cooperating with the magnetic ring is located on one side of the fixed base. The magnetic sensor is used to sense the position change of the magnetic ring to identify the clamping state of the first clamping arm and the second clamping arm.

[0006] In this utility model, an annular groove is also provided on the periphery of the top of the fixing column, and the magnetic ring is sleeved on the annular groove; The fixing post is also provided with a first piston and a second piston. The first piston and the second piston are respectively sleeved on the annular groove and are located on both sides of the magnetic ring. The first piston is located at the top of the fixing post and is fixed to the fixing post by screws.

[0007] In this invention, sealing rings are provided on the periphery of both the first piston and the second piston, and the sealing rings are in contact with the side wall of the cavity.

[0008] In this utility model, the first connecting arm includes a first slider, a first fixing block connected to the first end of the first slider, and a first clamping plate installed on the first fixing block, and the second end of the first slider is connected to the first connecting arm; The second connecting arm includes a second slider, a second fixing block connected to the first end of the second slider, and a second clamping plate mounted on the second fixing block. The second end of the second slider is connected to the second connecting arm, and the position of the second fixing block is opposite to that of the first fixing block.

[0009] In this invention, the thickness of the first end of the first slider is greater than the thickness of the second end of the first slider, and the first end of the first slider protrudes towards the direction of the second slider. The thickness of the first end of the second slider is greater than the thickness of the second end of the second slider, and the first end of the second slider protrudes in the direction of the first slider.

[0010] In this invention, a portion of the first fixing block is connected to the first end of the first slider, and the position of the first fixing block is close to the side of the second slider. The second fixing block is partially connected to the first end of the second slider, and the position of the second fixing block is close to one side of the second slider. The position of the second fixing block overlaps with that of the first fixing block.

[0011] In this invention, the first fixing block and the first slider are integrally formed, and the second fixing block and the second slider are integrally formed.

[0012] In this invention, the first clamping plate is detachably connected to the first fixing block, and the second clamping plate is detachably connected to the second fixing block.

[0013] In this invention, the first through groove has a convex structure, the first fixing block and the second fixing block are both located at the opening of the first through groove, and the first slider and the second slider are respectively located on both sides of the first through groove.

[0014] In this utility model, the fixing base includes a circular column and a connecting cover located below the circular column, and the connecting cover is fitted to the top of the mounting base.

[0015] Compared with the prior art, the advantages of this utility model are as follows: When the fixed column moves, it drives the magnetic ring to move. At the same time, the fixed column drives the first connecting arm and the second connecting arm to move relative to each other to clamp the item. The magnetic sensor senses the position of the magnetic ring to detect whether the first clamping arm and the second clamping arm are clamping the item or missing the item, thereby improving the accuracy of the flexible gripper in clamping the item. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments are briefly introduced below. The drawings described below are only the corresponding drawings of some embodiments of this utility model.

[0017] Figure 1 This is a side view of the flexible gripper of this utility model.

[0018] Figure 2 This is a perspective view of the flexible gripper of this utility model.

[0019] Figure 3 This is an exploded view of the flexible gripper clamping device of this utility model.

[0020] Figure 4 This is a top view of the flexible gripper of this utility model.

[0021] Figure 5 for Figure 3 A sectional view taken along the cutting line AA.

[0022] Figure 6 This is a perspective view of the first gripping arm of the flexible gripper of this utility model.

[0023] Figure 7 This is a perspective view of the mounting base for the flexible gripper of this utility model.

[0024] 11. Fixed base; 12. Clamping device; 13. Magnetic sensor; 111. Circular column; 112. Connecting cover; 121. Mounting base; 122. Fixed column; 123. Second connecting arm; 124. First connecting arm; 125. Second clamping arm; 126. First clamping arm; 127. Second clamping plate; 128. First clamping plate; 1221. First piston; 1222. Second piston; 1223. Magnetic ring; 1261. First slider; 1262. First fixing block; 1211. Through hole; 1212. First through groove. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0026] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure pertains.

[0027] The terms "first," "second," and similar words used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. The terms "comprising" or "including," and similar words, mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including," and do not exclude other elements or objects. The terms "connected" or "linked," and similar words, are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Above," "below," "left," "right," etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0029] The following is a preferred embodiment of a flexible gripper provided by this utility model that can solve the above technical problems.

[0030] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 7 ,in Figure 1 This is a side view of the flexible gripper of this utility model. Figure 2 This is a perspective view of the flexible gripper of this utility model. Figure 3 This is an exploded view of the flexible gripper clamping device of this utility model. Figure 4 This is a top view of the flexible gripper of this utility model. Figure 5 for Figure 3 A sectional view taken along the cutting line AA. Figure 6 This is a perspective view of the mounting base for the flexible gripper of this utility model.

[0031] In the diagram, units with similar structures are represented by the same labels.

[0032] The terms "first" and "second" in this utility model are used for descriptive purposes only and should not be construed as indicating or implying relative importance, nor as a restriction on the order of events.

[0033] This utility model provides a flexible gripper, including a fixed base 11 and a clamping device 12 connected below the fixed base 11. The fixed base 11 has a cavity. The clamping device 12 includes a mounting base 121 connected to the bottom of the fixed base 11 and a clamping assembly. The mounting base 121 has a through hole 1211 and a first through groove 1212. The through hole 1211 extends along the height direction of the mounting base 121 and communicates with the cavity. The first through groove 1212 extends along the length direction of the mounting base 121 and communicates with the through hole 1211. The clamping assembly includes a first clamping arm 126 and a second clamping arm 126 located in the first through groove 1212. 5. A fixed post 122 located between the cavity and the through hole 1211 and movable between the through hole 1211 and the cavity; a first connecting arm 124 rotatably connected at both ends to the fixed post 122 and the first clamping arm 126 respectively; a second connecting arm 123 rotatably connected at both ends to the fixed post 122 and the second clamping arm 125 respectively; and a magnetic ring 1223 mounted on the fixed post 122. A magnetic sensor 13 for cooperating with the magnetic ring is located on one side of the fixed base 11. The magnetic sensor 13 is used to sense the position change of the magnetic ring 1223 to identify the clamping state of the first clamping arm 126 and the second clamping arm 125.

[0034] The mounting base 11 is used to mount the clamping device 12, which is used to clamp an object. The magnetic sensor 13 is used to sense the distance the fixed post 122 moves. When the flexible gripper clamps an object, firstly, the flexible gripper is connected to an external air pump. When the external air pump applies pressure to the flexible gripper, the fixed post 122 moves towards the bottom of the mounting base 121. During the movement of the fixed post 122, since the two ends of the first connecting arm 124 are respectively rotatably connected to the fixed post 122 and the first clamping arm 126, and the two ends of the second connecting arm 123 are respectively connected to the first clamping arm 126, the fixed post 122 moves towards the bottom of the mounting base 121. The fixed post 122 is rotatably connected to the fixed post 122 and the second clamping arm 125. When the fixed post 122 moves downward, it drives the magnetic ring 1223 to move. At the same time, the fixed post 122 presses against the first connecting arm 124 and the second connecting arm 123. The first connecting arm 124 and the second connecting arm 123 rotate on the fixed post 122. Simultaneously, the first connecting arm 124 also rotates on the first clamping arm 126 and the second connecting arm 123 rotates on the second clamping arm 125. During the downward movement of the fixed post 122, the first clamping arm 126 and the second connecting arm 125 rotate... The two clamping arms 125 gradually open, aligning the first connecting arm 124 and the second connecting arm 123 in a straight line. During this opening process, the first connecting arm 124 and the second connecting arm 123 drive the first clamping arm 126 and the second clamping arm 125 to move relative to each other, thus clamping the object. Furthermore, as the fixing post 122 moves the magnetic ring 1223, the magnetic sensor 13 senses the distance the magnetic ring 1223 has moved. For example, if the magnetic sensor 13 senses a distance the magnetic ring 1223 has moved... If the distance exceeds the set distance, it is determined that the first clamping arm 126 and the second clamping arm 125 have not clamped any items. If the magnetic sensor 13 senses that the magnetic ring 1223 has moved less than the set distance, it is determined that the first clamping arm 126 and the second clamping arm 125 have clamped multiple items. If the magnetic sensor 13 senses that the magnetic ring 1223 has moved to the set distance, it is determined that the first clamping arm 126 and the second clamping arm 125 have clamped the corresponding items. Through the above structure, the accuracy of the flexible gripper in clamping items can be effectively improved.

[0035] In this embodiment, a second through groove is also provided at the bottom of the fixing post 122. The first connecting arm 124 and the second connecting arm 123 are both connected in the second through groove. The first connecting arm 124 and the second connecting arm 123 are movably connected in the second through groove of the fixing post 122 by rivets or bolts, so that the first connecting arm 124 and the second connecting arm 123 can rotate in the second through groove.

[0036] In this embodiment, the first connecting arm 124 is movably connected to the first slider 1261 by bolts or rivets, and the second connecting arm 123 is movably connected to the second slider by bolts or rivets.

[0037] An annular groove is provided on the periphery of the top of the fixed column 122. The magnetic ring 1223 is sleeved on the annular groove. A first piston 1221 and a second piston 1222 are also provided on the fixed column 122. The first piston 1221 and the second piston 1222 are respectively sleeved on the annular groove and located on both sides of the magnetic ring 1223. The first piston 1221 is located at the top of the fixed column 122 and is fixed to the fixed column 122 by screws. The first piston 1221 and the second piston 1222 are used to seal the chamber and prevent gas from leaking out from the periphery of the fixed column 122 after external gas enters. This allows the fixed column 122 to be stably driven to move after external gas enters. At the same time, the first piston 1221 and the second piston 1222 are used to seal the chamber and prevent gas from leaking out from the periphery of the fixed column 122 after external gas enters. The piston 1221 is fixed on the fixed post 122. The second piston 1222 is located at the bottom of the annular groove. The magnetic ring 1223 is located between the first piston 1221 and the second piston 1222. When the fixed post 122 moves downward, the first piston 1221 abuts against the magnetic ring 1223, and the magnetic ring 1223 abuts against the second piston 1222, so that the first piston 1221, the second piston 1222, and the magnetic ring 1223 move with the fixed post 122. When the fixed post 122 moves upward, the side wall of the annular groove abuts against the second piston 1222, and the second piston 1222 abuts against the magnetic ring 1223, so that the first piston 1221, the second piston 1222, and the magnetic ring 1223 move with the fixed post 122.

[0038] Both the first piston 1221 and the second piston 1222 are provided with sealing rings on their periphery. The sealing rings fit against the side wall of the cavity. The sealing rings are used to further ensure the airtightness of the first piston 1221 and the second piston 1222 connected in the cavity, so that the external gas can stably drive the fixed column 122 to move.

[0039] Please refer to Figure 6 , Figure 6This is a perspective view of the first gripping arm of the flexible gripper of this utility model. The first connecting arm 124 includes a first slider 1261, a first fixing block 1262 connected to the first end of the first slider 1261, and a first clamping plate 128 mounted on the first fixing block 1262. The second end of the first slider 1261 is connected to the first connecting arm 124. The second connecting arm 123 includes a second slider, a second fixing block connected to the first end of the second slider, and a second clamping plate 127 mounted on the second fixing block. The second end of the second slider is connected to the second connecting arm 123. The position of the second fixing block is opposite to that of the first fixing block 1262. The first slider 1261 and the second slider are respectively connected in the first through groove 1212. Slider 1261 is used to install first fixing block 1262, first fixing block 1262 is used to install first clamping plate 128, first clamping plate 128 is used for, second slider is used to install second fixing block, second fixing block is used to install second clamping plate 127. When first clamping plate 128 and second clamping plate 127 move relative to each other, they are used to clamp or release items. When clamping items, first slider 1261 and second slider move within first through groove 1212. First slider 1261 drives first fixing block 1262 to move, first fixing block 1262 drives first clamping plate 128 to move, second slider drives second fixing block to move, second fixing block drives second clamping plate 127 to move, so that first clamping plate 128 and second clamping plate 127 move relative to each other to clamp items.

[0040] The thickness of the first end of the first slider 1261 is greater than the thickness of the second end of the first slider 1261, and the first end of the first slider 1261 protrudes towards the second slider; the thickness of the first end of the second slider is greater than the thickness of the second end of the second slider, and the first end of the second slider protrudes towards the first slider 1261; a portion of the first fixing block 1262 is connected to the first end of the first slider 1261, and the position of the first fixing block 1262 is close to the side of the second slider; a portion of the second fixing block is connected to the first end of the second slider, and the position of the second fixing block is close to the side of the second slider; the second fixing block and the first fixing block... The positions of blocks 1262 overlap, the thickness of the first end of the first slider 1261 is greater than the thickness of the second end of the first slider 1261, and a portion of the first fixing block 1262 is connected to the first slider 1261. The thickness of the first end of the second slider is greater than the thickness of the second end of the second slider, and a portion of the second fixing block is connected to the first slider 1261. This facilitates the overlap of the positions of the first fixing block 1262 and the second fixing block. When installing the first clamping plate 128 and the second clamping plate 127, the positions of the first clamping plate 128 and the second clamping plate 127 overlap, which facilitates the clamping of items by the first clamping plate 128 and the second clamping plate 127.

[0041] In this embodiment, the first fixing block 1262 is located on the outer side of one end of the mounting base 121, and the second fixing block is located on the outer side of the other end of the mounting base 121. When the first slider 1261 and the second slider move, the first slider 1261 and the second slider move relative to each other, so that the first fixing block 1262 and the second fixing block move towards each other, thereby clamping or releasing the item.

[0042] The first fixing block 1262 is integrally formed with the first slider 1261 to prevent the first fixing block 1262 from separating from the first slider 1261 and to increase the hardness of the first fixing block 1262 connected to the first slider 1261. The second fixing block is integrally formed with the second slider to prevent the second fixing block from separating from the second slider and to increase the hardness of the second fixing block connected to the second slider.

[0043] The first clamping plate 128 is detachably connected to the first fixing block 1262, and the second clamping plate 127 is detachably connected to the second fixing block, so that the first clamping plate 128 and the second clamping plate 127 can be replaced, so that the first clamping plate 128 and the second clamping plate 127 can clamp items of different specifications and shapes.

[0044] The first through groove 1212 has a convex structure. The first fixing block 1262 and the second fixing block are both located at the opening of the first through groove 1212. The first slider 1261 and the second slider are respectively located on both sides of the first through groove 1212. The first through groove 1212 has a graphic structure. On the one hand, the first slider 1261 and the second slider are connected to the side wall of the first through groove 1212 to limit the first slider 1261 and the second slider. During the movement, the first slider 1261 and the second slider are prevented from shifting their positions, so that the first slider 1261 and the second slider can move along a set trajectory. On the other hand, the first fixing block 1262 and the second fixing block are located at the opening of the first through groove 1212. The opening of the first through groove 1212 can limit the first fixing block 1262 and the second fixing block. During the movement of the first slider 1261 and the second slider, the movement position of the first fixing block 1262 and the second fixing block is further limited, further preventing the first fixing block 1262 and the second fixing block from shifting their positions during the movement.

[0045] The mounting base 11 includes a circular post 111 and a connecting cover 112 located below the circular post 111. The connecting cover 112 fits against the top of the mounting base 121. The circular post 111 is used to connect to the air pump of an external device. The connecting cover 112 is used to fit against the mounting base 121. The connecting cover 112 is fixed to the mounting base 121 by screws to prevent the mounting base 121 from separating from the connecting cover 112.

[0046] Working principle: When the flexible gripper grasps an item, firstly, gas from the air pump enters the cavity and compresses the fixing post 122. Under this compression, the fixing post 122 moves towards the mounting base 121. During this movement, the fixing post 122 drives the first piston 1221, the magnetic ring 1223, and the second piston 1222 to move synchronously. Simultaneously, the fixing post 122 compresses the first connecting arm 124 and the second connecting arm 123. The first connecting arm 124 compresses the first slider 1261, and the second connecting arm 123 compresses the second slider. The first slider 1261 and the second slider move relative to each other, moving outwards from the mounting base 121. Simultaneously, the first slider 1261, during its movement, drives the first fixing block 1262 to move inwards from the mounting base 121, and the second slider, during its movement, drives the first fixing block 1262 to move inwards from the mounting base 121. Block 1262 moves inward toward the mounting base 121, causing the first clamping plate 128 on the first fixing block 1262 and the second clamping plate 127 on the second fixing block to move relative to each other, thereby clamping the item. Furthermore, when the first connecting arm 124 and the second connecting arm 123 rotate, the first connecting arm 124 and the second connecting arm 123 are in an open state, so that the first clamping plate 128 and the second clamping plate 127 are in contact. Furthermore, under the action of the magnetic sensor 13, when the magnetic ring 1223 moves a distance exceeding the set distance, it is determined that the flexible gripper has not clamped the item. When the magnetic ring 1223 moves a distance less than the set distance, it is determined that the flexible gripper has clamped multiple items. When the magnetic sensor 13 senses that the magnetic ring 1223 has moved to the set distance, it is determined that the flexible gripper has clamped the corresponding item, thereby effectively improving the accuracy of gripping the item.

[0047] In this preferred embodiment, the flexible gripper moves along with the magnetic ring as the fixed post moves. Simultaneously, the fixed post drives the first connecting arm and the second connecting arm to move relative to each other to grip the item. The magnetic sensor senses the position of the magnetic ring to detect whether the first and second gripping arms are gripping the item or have missed gripping the item, thereby improving the accuracy of the flexible gripper in gripping the item.

[0048] In summary, although the present invention has been disclosed above with reference to preferred embodiments, the above preferred embodiments are not intended to limit the present invention. Those skilled in the art can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope defined in the claims.

Claims

1. A flexible gripper, characterized in that, The device includes a fixed base and a clamping device connected below the fixed base. The fixed base has a cavity. The clamping device includes a mounting base connected to the bottom of the fixed base and a clamping assembly. The mounting base has a through hole and a first through groove. The through hole extends along the height direction of the mounting base and communicates with the cavity. The first through groove extends along the length direction of the mounting base and communicates with the through hole. The clamping assembly includes a first clamping arm and a second clamping arm located in the first through groove. A fixed post is located between the cavity and the through hole and is movable between the through hole and the cavity. A first connecting arm is rotatably connected at both ends to the fixed post and the first clamping arm, respectively. A second connecting arm is rotatably connected at both ends to the fixed post and the second clamping arm, respectively. A magnetic ring is mounted on the fixed post. A magnetic sensor for cooperating with the magnetic ring is located on one side of the fixed base. The magnetic sensor is used to sense the position change of the magnetic ring to identify the clamping state of the first clamping arm and the second clamping arm.

2. The flexible gripper according to claim 1, characterized in that, An annular groove is also provided on the periphery of the top of the fixed column, and the magnetic ring is sleeved on the annular groove. The fixing post is also provided with a first piston and a second piston. The first piston and the second piston are respectively sleeved on the annular groove and are located on both sides of the magnetic ring. The first piston is located at the top of the fixing post and is fixed to the fixing post by screws.

3. The flexible gripper according to claim 2, characterized in that, Both the first piston and the second piston are provided with sealing rings on their circumferences, and the sealing rings are in contact with the sidewall of the cavity.

4. The flexible gripper according to claim 1, characterized in that, The first connecting arm includes a first slider, a first fixing block connected to a first end of the first slider, and a first clamping plate mounted on the first fixing block; the second end of the first slider is connected to the first connecting arm. The second connecting arm includes a second slider, a second fixing block connected to the first end of the second slider, and a second clamping plate mounted on the second fixing block. The second end of the second slider is connected to the second connecting arm, and the position of the second fixing block is opposite to that of the first fixing block.

5. The flexible gripper according to claim 4, characterized in that, The thickness of the first end of the first slider is greater than the thickness of the second end of the first slider, and the first end of the first slider protrudes towards the direction of the second slider; The thickness of the first end of the second slider is greater than the thickness of the second end of the second slider, and the first end of the second slider protrudes in the direction of the first slider.

6. The flexible gripper according to claim 5, characterized in that, The first fixing block is partially connected to the first end of the first slider, and the first fixing block is located on the side close to the second slider; The second fixing block is partially connected to the first end of the second slider, and the position of the second fixing block is close to one side of the second slider. The position of the second fixing block overlaps with that of the first fixing block.

7. The flexible gripper according to claim 4, characterized in that, The first fixing block and the first slider are integrally formed, and the second fixing block and the second slider are integrally formed.

8. The flexible gripper according to claim 4, characterized in that, The first clamping plate is detachably connected to the first fixing block, and the second clamping plate is detachably connected to the second fixing block.

9. The flexible gripper according to claim 4, characterized in that, The first through groove has a convex structure, and the first fixing block and the second fixing block are both located at the opening of the first through groove. The first slider and the second slider are respectively located on both sides of the first through groove.

10. The flexible gripper according to claim 1, characterized in that, The mounting base includes a circular column and a connecting cover located below the circular column, the connecting cover being fitted to the top of the mounting base.

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