A steel strip bending forming device for abrasion-resistant welding wire production

Abstract

This utility model discloses a steel strip bending and forming device for the production of wear-resistant welding wire, relating to the field of steel strip bending technology. The utility model includes a limiting component and a steel strip. The limiting component includes a base, with two support seats fixedly connected to the top of the base. Two fixed shafts are fixedly connected to the two support seats on their adjacent sides. This utility model prevents the steel strip from shifting by the friction generated by the bottom wheel and clamping wheel. Simultaneously, two bending wheels apply a mirror force to both the front and rear sides of the steel strip during the limiting process, folding up both sides of the steel strip to complete the bending operation. This design uses the initial limiting wheel and the clamping friction between the bottom wheel and clamping wheel to fix the steel strip, avoiding bending position deviation or irregular shape caused by steel strip shift during bending. The simultaneous bending force applied to both sides of the steel strip by the two bending wheels avoids twisting or lateral bending of the steel strip caused by unilateral force, ensuring the symmetry of the bending angle and shape.

Description

Technical Field

[0001] This utility model belongs to the field of steel strip bending technology, and in particular relates to a steel strip bending and forming device for the production of wear-resistant welding wire. Background Technology

[0002] In the production of wear-resistant welding wire, steel strip bending is a critical process, and its precision directly affects the structural strength and performance of the welding wire. Existing equipment is prone to bending position deviations or irregular edge shapes due to steel strip misalignment during bending. Applying pressure with a single-sided bending wheel can easily subject the steel strip to asymmetrical forces, causing twisting or lateral bending, making it difficult to guarantee the bending angle and the symmetry of the two edges, thus affecting the subsequent welding wire forming quality. To address these issues, the following solutions are proposed. Utility Model Content

[0003] The purpose of this invention is to provide a steel strip bending and forming device for the production of wear-resistant welding wire. The device fixes the steel strip by the initial positioning of the limiting wheel and the clamping friction between the bottom wheel and the clamping wheel, which solves the problem that the existing device is prone to bending position deviation or irregular edge shape due to steel strip displacement when bending the steel strip.

[0004] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution: This utility model relates to a steel strip bending and forming device for the production of wear-resistant welding wire, comprising a limiting component and a steel strip. The limiting component includes a base, with two support seats fixedly connected to the top of the base. Two fixed shafts are fixedly connected to the two support seats on their adjacent sides. Limiting wheels are rotatably connected to the outer surfaces of both fixed shafts. The device also includes: A bending assembly, comprising two pressure plates disposed on the top of a base, each pressure plate having a fluid guiding hose disposed on a side away from each other, and each fluid guiding hose having a limit block fixedly connected to one end near the bottom. The adjustment assembly includes support plates disposed on the front and rear sides of the base, with locking pins slidably connected to the inner walls of the support plates, and springs sleeved on the outer walls of the two locking pins.

[0005] Furthermore, two support bases are fixedly connected to a second fixed shaft on their adjacent sides. A bottom wheel is rotatably connected to the outer surface of the second fixed shaft. A support frame is fixedly connected to the top of the base. An electric push-pull rod is fixedly connected to the inner wall of the support frame. A movable frame is fixedly connected to the bottom of the output end of the electric push-pull rod. A sliding shaft is fixedly connected to the inner wall of the movable frame. When using this device, first install the device in a suitable position on the welding wire production line. Then, pass the steel strip through the limit wheel and between the bottom wheel and the clamping wheel. When bending the steel strip, start the electric push-pull rod, which will drive the movable frame to move downward.

[0006] Furthermore, a clamping wheel is rotatably connected to the outer surface of the sliding shaft, and two fixing blocks are fixedly connected to the bottom of the support frame. Each of the two fixing blocks has a limit ring fixedly connected to its bottom. The outer surface of the sliding shaft is slidably connected to the inner wall of the two limit rings. The moving frame will drive the clamping wheel to move downward together through the sliding shaft until the steel strip is clamped between the bottom wheel and the clamping wheel. The friction generated by the clamping of the two prevents the steel strip from shifting.

[0007] Furthermore, the outer surfaces of the two pressure plates are slidably connected to the inner walls of the corresponding fixed blocks, the outer surfaces of the pressure plates are slidably connected to the inner walls of the fixed blocks, the outer surfaces of the pressure plates are slidably connected to the inner walls of the limiting rings, and the tops of the two fluid guiding hoses are fixedly connected to the bottoms of the corresponding fixed blocks. During the downward movement of the sliding axis, it will drive the two pressure plates to move downward together. During the downward movement of the two pressure plates, the hydraulic oil inside the two fixed blocks will be pushed into the two fluid guiding hoses respectively.

[0008] Furthermore, each of the two limiting blocks has a sliding plate slidably connected to its inner wall. Each of the two sliding plates has a sliding frame fixedly connected to its adjacent side. The outer surfaces of the two sliding frames are slidably connected to the corresponding outer walls of the limiting blocks. Each of the outer surfaces of the two sliding frames is rotatably connected to a bending wheel. Two hydraulic hoses will respectively introduce hydraulic oil into the interior of the two limiting blocks. The hydraulic oil pushed into the limiting blocks will push the two sliding plates towards each other. During the movement of the two sliding plates, they will respectively drive the two sliding frames to move together. During the movement of the two sliding frames, they will respectively... The device moves towards the steel strip with two bending wheels, applying a mirror force simultaneously to both sides of the steel strip in the limiting position. This folds up both sides of the steel strip, thus completing the bending process. This design uses the initial limiting wheel and the clamping friction between the bottom wheel and the clamping wheel to fix the steel strip, preventing bending position deviation or irregular shape caused by steel strip offset during bending. At the same time, the two bending wheels apply equal and symmetrical bending forces to both sides of the steel strip, preventing twisting or lateral bending caused by unilateral force, and ensuring the symmetry of the bending angle and shape.

[0009] Furthermore, the inner walls of both support plates are slidably connected to limit rods. The two limit rods are fixedly connected to the front and back of the base on their respective sides. The outer surfaces of the two locking pins are slidably connected to the inner walls of their respective limit blocks. The left sides of the two springs are fixedly connected to the outer walls of their respective locking pins, and the right sides of the two springs are fixedly connected to the left sides of their respective support plates. When adjusting the bending angle and depth of the steel strip, the locking pin can be pulled to the right before using this device to separate the protrusion on the surface of the locking pin from the limit block. At this time, the bending wheel can be moved by rotating the limit block to adjust the angle of the bending wheel. After adjusting the angle of the bending wheel, the protrusion on the surface of the locking pin should be re-engaged into the interior of the limit block, and then the locking pin should be released. The locking pin will reset under the action of the spring, limiting the rotation of the limit block.

[0010] Furthermore, a double-threaded rod is threadedly connected to the inner wall of the support plate, and a handle is fixedly connected to the front of the double-threaded rod. The outer surface of the double-threaded rod is rotatably connected to the inner wall of the base. The double-threaded rod can be rotated by rotating the handle. During the rotation, the double-threaded rod will move the two support plates toward each other or in opposite directions through the mirrored threads on its front and rear sides, thereby further improving the flexibility of bending. This design can be adjusted by adjusting the distance and angle between the two bending wheels, thereby flexibly adjusting the angle and depth of the steel strip being bent to adapt to the production needs of welding wire of different specifications.

[0011] This utility model has the following beneficial effects: When bending a steel strip, this invention activates an electric push-pull rod, causing the clamping wheel to move downwards and clamp the steel strip between the bottom wheel and the clamping wheel. The friction generated by the clamping action prevents the steel strip from shifting. Simultaneously, two bending wheels apply a mirror force to both the front and rear sides of the steel strip in the limiting position, folding up both sides of the steel strip to complete the bending process. This design uses the initial limiting wheel and the clamping friction between the bottom wheel and the clamping wheel to fix the steel strip, avoiding deviations in the bending position or irregular shapes caused by steel strip shifting during bending. Furthermore, the two bending wheels apply equal and symmetrical bending forces to both sides of the steel strip, preventing twisting or lateral bending caused by unilateral force and ensuring the symmetry of the bending angle and shape.

[0012] When adjusting the bending angle and depth of the steel strip, this invention allows for adjustment by pulling the locking pin to the right before using the device. This separates the protrusion on the locking pin from the limiting block. The limiting block can then be rotated to move the bending wheel, thus adjusting its angle. After adjusting the bending wheel angle, the protrusion on the locking pin is repositioned into the limiting block, and then the locking pin is released. The locking pin will reset under the action of the spring, limiting the rotation of the limiting block. Simultaneously, the double-threaded rod can be rotated by rotating the handle. During rotation, the mirrored threads on its front and rear sides move the two support plates closer to each other or in opposite directions, further improving bending flexibility. This design allows for flexible adjustment of the bending angle and depth of the steel strip by adjusting the distance and angle between the two bending wheels, adapting to the production needs of welding wires of different specifications.

[0013] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the left-side cross-sectional structure of the present invention; Figure 3 This is a schematic diagram of the overall structure of the clamping wheel of this utility model; Figure 4 This utility model Figure 2 A magnified structural diagram of A in the middle; Figure 5 This utility model Figure 2 A magnified structural diagram of B in the diagram; Figure 6 This is a schematic diagram of the overall structure of the support plate of this utility model; Figure 7 This is a schematic diagram of the internal cross-sectional structure of the support plate of this utility model; Figure 8 This is an exploded three-dimensional structural diagram of the sliding frame of this utility model; Figure 9 This is a schematic diagram of the overall structure of the double-ended threaded rod of this utility model.

[0016] The attached diagram lists the components represented by each number as follows: 1. Limiting assembly; 101. Base; 102. Support seat; 103. Fixed shaft one; 1031. Limiting wheel; 104. Fixed shaft two; 1041. Bottom wheel; 105. Support frame; 106. Electric push-pull rod; 107. Moving frame; 108. Sliding shaft; 1081. Clamping wheel; 109. Fixed block; 110. Limiting ring; 2. Bending assembly; 201. Pressure plate; 202. Liquid guiding hose; 203. Limiting block; 204. Moving plate; 205. Sliding frame; 206. Bending wheel; 3. Adjusting assembly; 301. Support plate; 3011. Limiting rod; 302. Locking post; 303. Spring; 304. Handle; 305. Double-ended threaded rod; 4. Steel strip. Detailed Implementation

[0017] 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.

[0018] Please see Figure 1-9 As shown, this utility model is a steel strip bending and forming device for the production of wear-resistant welding wire, including a limiting component 1 and a steel strip 4. The limiting component 1 includes a base 101, with two support seats 102 fixedly connected to the top of the base 101. Two fixed shafts 103 are fixedly connected to the two support seats 102 on their adjacent sides. Limiting wheels 1031 are rotatably connected to the outer surfaces of the two fixed shafts 103. The device also includes: The bending assembly 2 includes two pressure plates 201 disposed on the top of the base 101. Each of the two pressure plates 201 is provided with a liquid guiding hose 202 on the side that is far apart from each other. Each of the two liquid guiding hoses 202 is fixedly connected to a limit block 203 at the end near the bottom. Adjustment component 3 includes support plates 301 set on the front and rear sides of the base 101. The inner wall of the support plate 301 is slidably connected with a locking post 302, and the outer wall of each locking post 302 is sleeved with a spring 303.

[0019] Two support bases 102 are fixedly connected to a fixed shaft 104 on their adjacent sides. A bottom wheel 1041 is rotatably connected to the outer surface of the fixed shaft 104. A support frame 105 is fixedly connected to the top of the base 101. An electric push-pull rod 106 is fixedly connected to the inner wall of the support frame 105. A movable frame 107 is fixedly connected to the bottom of the output end of the electric push-pull rod 106. A sliding shaft 108 is fixedly connected to the inner wall of the movable frame 107. When using this device, first install the device in a suitable position on the welding wire production line. Then, pass the steel strip 4 through the limit wheel 1031 and between the bottom wheel 1041 and the clamping wheel 1081. When the steel strip 4 needs to be bent, start the electric push-pull rod 106. The electric push-pull rod 106 will drive the movable frame 107 to move downward.

[0020] A clamping wheel 1081 is rotatably connected to the outer surface of the sliding shaft 108. Two fixing blocks 109 are fixedly connected to the bottom of the support frame 105. Limiting rings 110 are fixedly connected to the bottom of the two fixing blocks 109. The outer surface of the sliding shaft 108 is slidably connected to the inner wall of the two limiting rings 110. The moving frame 107 will drive the clamping wheel 1081 to move downward together through the sliding shaft 108 until the steel belt 4 is clamped between the bottom wheel 1041 and the clamping wheel 1081. The friction generated by the clamping of the two prevents the steel belt 4 from shifting.

[0021] The outer surfaces of the two pressure plates 201 are slidably connected to the inner walls of the corresponding fixed blocks 109, the outer surfaces of the pressure plates 201 are slidably connected to the inner walls of the fixed blocks 109, the outer surfaces of the pressure plates 201 are slidably connected to the inner walls of the limiting rings 110, and the tops of the two fluid guiding hoses 202 are fixedly connected to the bottoms of the corresponding fixed blocks 109. As the sliding shaft 108 moves downward, it will drive the two pressure plates 201 to move downward together. As the two pressure plates 201 move downward, they will push the hydraulic oil inside the two fixed blocks 109 into the two fluid guiding hoses 202 respectively.

[0022] Both limiting blocks 203 have sliding plates 204 slidably connected to their inner walls. Each sliding plate 204 has a sliding frame 205 fixedly connected to its adjacent side. The outer surfaces of the two sliding frames 205 are slidably connected to the outer walls of their respective limiting blocks 203. Each sliding frame 205 has a bending wheel 206 rotatably connected to its outer surface. Two hydraulic hoses 202 introduce hydraulic oil into the two limiting blocks 203. The hydraulic oil pushed into the limiting blocks 203 pushes the two sliding plates 204 towards each other. During this movement, the two sliding plates 204 drive the two sliding frames 205 to move together. The two bending wheels 206 move towards the steel belt 4, and apply a mirror force to the front and rear sides of the steel belt 4 simultaneously through the two bending wheels 206, folding up the front and rear sides of the steel belt 4, thus completing the bending of the steel belt 4. This design uses the initial limiting wheel 1031 and the clamping friction of the bottom wheel 1041 and the clamping wheel 1081 to fix the steel belt 4, avoiding bending position deviation or irregular shape caused by steel belt offset during bending. At the same time, the two bending wheels 206 apply bending forces of equal magnitude and symmetrical direction to the front and rear sides of the steel belt, avoiding steel belt twisting or side bending caused by unilateral force, and ensuring the symmetry of bending angle and shape.

[0023] Both support plates 301 have slidably connected limit rods 3011 on their inner walls. The two limit rods 3011 are fixedly connected to the front and back of the base 101 on their respective sides. The outer surfaces of the two locking posts 302 are slidably connected to the inner walls of their corresponding limit blocks 203. The left sides of the two springs 303 are fixedly connected to the outer walls of their corresponding locking posts 302, and the right sides of the two springs 303 are fixedly connected to the left sides of their corresponding support plates 301. When adjusting the bending angle and depth of the steel strip 4... Before using this device, pull the locking pin 302 to the right to separate the protrusion on the surface of the locking pin 302 from the limiting block 203. At this time, the bending wheel 206 can be moved together by rotating the limiting block 203, thereby adjusting the angle of the bending wheel 206. After the angle of the bending wheel 206 is adjusted, first re-lock the protrusion on the surface of the locking pin 302 into the interior of the limiting block 203, and then release the locking pin 302. The locking pin 302 will reset under the action of the spring 303, restricting the rotation of the limiting block 203.

[0024] The inner wall of the support plate 301 is threaded with a double-threaded rod 305. A handle 304 is fixedly connected to the front of the double-threaded rod 305. The outer surface of the double-threaded rod 305 is rotatably connected to the inner wall of the base 101. The double-threaded rod 305 can be rotated by rotating the handle 304. During the rotation, the double-threaded rod 305 will move the two support plates 301 toward each other or in opposite directions through the mirrored threads on its front and rear sides, thereby further improving the flexibility of bending. This design can be adjusted by adjusting the distance and angle between the two bending wheels 206, thereby flexibly adjusting the angle and depth of bending of the steel strip 4 to meet the production needs of welding wire of different specifications.

[0025] One specific application of this embodiment is: When using this device, first install it in a suitable position on the welding wire production line. Then, pass the steel strip 4 through the limiting wheel 1031 and between the bottom wheel 1041 and the clamping wheel 1081. When bending the steel strip 4, activate the electric push-pull rod 106. The electric push-pull rod 106 will drive the moving frame 107 to move downward. The moving frame 107 will drive the clamping wheel 1081 to move downward together through the sliding shaft 108 until the steel strip 4 is clamped between the bottom wheel 1041 and the clamping wheel 1081. The friction generated by the clamping prevents the steel strip 4 from shifting. During the downward movement of the sliding shaft 108, it will drive the two pressure plates 201 to move downward together. During the downward movement of the two pressure plates 201, the hydraulic oil inside the two fixed blocks 109 will be pushed into the two guide hoses 202 respectively. The two guide hoses 202 will then pass the hydraulic oil into the two limiting blocks 203 respectively. The internal hydraulic oil pushes the two moving plates 204 toward each other. During the movement, the two moving plates 204 drive the two sliding frames 205 to move together. During the movement, the two sliding frames 205 carry the two bending wheels 206 toward the steel strip 4. The two bending wheels 206 apply a mirror force to the front and rear sides of the steel strip 4 in the limiting position, folding up the front and rear sides of the steel strip 4, thus completing the bending of the steel strip 4. This design uses the initial limiting wheel 1031 and the clamping friction of the bottom wheel 1041 and the clamping wheel 1081 to fix the steel strip 4, avoiding bending position deviation or irregular shape caused by steel strip offset during bending. At the same time, the two bending wheels 206 apply bending forces of equal magnitude and symmetrical direction to the front and rear sides of the steel strip, avoiding steel strip twisting or side bending caused by unilateral force, and ensuring the symmetry of bending angle and shape. It should be noted that during the downward movement of the pressure plate 201, it will draw in external air through the small hole at the top of the fixing block 109 to prevent the pressure plate 201 from being unable to move downward; there is a gap between the moving plate 204 and the limiting block 203, and the protrusion on the side of the two moving plates 204 that is far apart from each other is sealed with the limiting block 203. During the process of the two moving plates 204 approaching each other, both will push out the air inside the limiting block 203 through the gap between the moving plate 204 and the limiting block 203; in the initial state, the fixing block 109 and the liquid guiding hose 202 are both filled with hydraulic oil; When adjusting the bending angle and depth of the steel strip 4, pull the locking post 302 to the right before using this device to separate the protrusion on the surface of the locking post 302 from the limiting block 203. At this time, the bending wheel 206 can be moved together by rotating the limiting block 203, thereby adjusting the angle of the bending wheel 206. After adjusting the angle of the bending wheel 206, first re-engage the protrusion on the surface of the locking post 302 into the limiting block 203, and then release the locking post 302. The locking post 302 will reset under the action of the spring 303. The limit block 203 is restricted from rotating. At the same time, the double-threaded rod 305 can be rotated by rotating the handle 304. During the rotation, the double-threaded rod 305 will move the two support plates 301 in a direction that is closer to each other or in opposite directions through the mirror threads on its front and rear sides, thereby further improving the flexibility of bending. This design can be adjusted by adjusting the distance and angle between the two bending wheels 206, thereby flexibly adjusting the angle and depth of bending of the steel strip 4 to meet the production needs of welding wire of different specifications.

[0026] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0027] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the present utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the present utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A steel strip bending forming device for wear-resistant welding wire production, comprising a limiting assembly (1) and a steel strip (4), the limiting assembly (1) comprises a base (101), the top of the base (101) is fixedly connected with two support seats (102), the side close to each other of the two support seats (102) is fixedly connected with two fixed shafts one (103), the outer surface of the two fixed shafts one (103) is rotatably connected with a limiting wheel (1031), characterized in that, Also includes: The bending assembly (2) includes two pressure plates (201) disposed on the top of the base (101). Each of the two pressure plates (201) is provided with a liquid guiding hose (202) on the side away from each other. Each of the two liquid guiding hoses (202) is fixedly connected to a limit block (203) at one end near the bottom. Adjustment component (3), the adjustment component (3) includes support plates (301) disposed on the front and rear sides of the base (101), the inner wall of the support plate (301) is slidably connected with a locking post (302), and the outer wall of the two locking posts (302) is sleeved with a spring (303).

2. A steel strip bending forming device for abrasion resistant welding wire production according to claim 1, characterized in that, Two support bases (102) are fixedly connected to a fixed shaft two (104) on their adjacent sides. The outer surface of the fixed shaft two (104) is rotatably connected to a bottom wheel (1041). The top of the base (101) is fixedly connected to a support frame (105). The inner wall of the support frame (105) is fixedly connected to an electric push-pull rod (106). The bottom of the output end of the electric push-pull rod (106) is fixedly connected to a movable frame (107). The inner wall of the movable frame (107) is fixedly connected to a sliding shaft (108).

3. A steel strip bending forming device for abrasion resistant welding wire production according to claim 2, characterized in that, The outer surface of the sliding shaft (108) is rotatably connected to a clamping wheel (1081), and the bottom of the support frame (105) is fixedly connected to two fixing blocks (109). The bottom of each of the two fixing blocks (109) is fixedly connected to a limiting ring (110), and the outer surface of the sliding shaft (108) is slidably connected to the inner wall of the two limiting rings (110).

4. A steel strip bending forming device for abrasion resistant welding wire production according to claim 1, characterized in that, The outer surfaces of the two pressure plates (201) are slidably connected to the inner walls of the corresponding fixing blocks (109), the outer surfaces of the pressure plates (201) are slidably connected to the inner walls of the fixing blocks (109), the outer surfaces of the pressure plates (201) are slidably connected to the inner walls of the limiting rings (110), and the tops of the two liquid guiding hoses (202) are fixedly connected to the bottoms of the corresponding fixing blocks (109).

5. A steel strip bending forming device for abrasion resistant welding wire production according to claim 1, characterized in that, The inner walls of the two limiting blocks (203) are slidably connected with moving plates (204), and the two moving plates (204) are fixedly connected with sliding frames (205) on the side that is close to each other. The outer surfaces of the two sliding frames (205) are slidably connected to the outer walls of the corresponding limiting blocks (203), and the outer surfaces of the two sliding frames (205) are rotatably connected with bending wheels (206).

6. A steel strip bending forming device for abrasion resistant welding wire production according to claim 1 characterized in that, The inner walls of the two support plates (301) are slidably connected to limit rods (3011). The two limit rods (3011) are fixedly connected to the front and back of the base (101) respectively on their respective sides. The outer surfaces of the two locking posts (302) are slidably connected to the inner walls of the corresponding limiting blocks (203). The left sides of the two springs (303) are fixedly connected to the outer walls of the corresponding locking posts (302) respectively, and the right sides of the two springs (303) are fixedly connected to the left sides of the corresponding support plates (301) respectively.

7. A steel strip bending forming device for abrasion resistant welding wire production according to claim 1 characterized in that, The inner wall of the support plate (301) is threaded with a double-ended threaded rod (305), and a handle (304) is fixedly connected to the front of the double-ended threaded rod (305). The outer surface of the double-ended threaded rod (305) is rotatably connected to the inner wall of the base (101).

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