Embedded bolt auxiliary adjusting device

Abstract

The application relates to the field of building construction, in particular to a pre-buried bolt auxiliary adjusting device. At present, the positioning and adjusting mode of the pre-buried bolt has the shortcomings that the pre-buried bolt cannot be positioned to an accurate position, the pre-buried bolt is inconvenient to limit, and the position of the pre-buried bolt is not accurate enough, and the construction efficiency is low. The device comprises a base platform; four contact plates are arranged on the top of a mold; a positioning frame is slidably connected between the four contact plates; a positioning groove is arranged on the top of the positioning frame; and a compression spring is arranged between the positioning frame and the four contact plates. Workers place the device on the mold, the positioning groove on the positioning frame is aligned with the positioning axis, the workers press the positioning frame to move downward and align with the elevation point, and the four locking bolts are twisted to limit the positioning frame, the pre-buried bolt can be positioned in multiple directions, the position of the pre-buried bolt is more accurate, and the construction efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of building construction, and in particular to an auxiliary adjustment device for pre-embedded bolts. Background Technology

[0002] Pre-embedded components are steel parts that are pre-fixed with cement to secure equipment during installation. Pre-embedded bolts, also known as anchor bolts, are bolts that are pre-cast into the cement foundation of the equipment and used to fix the equipment after solidification. Construction requires precise positioning of pre-embedded bolts, so their position needs to be adjusted before installation.

[0003] However, the current method for positioning and adjusting embedded bolts mostly involves using an installation template to support the embedded bolts. Workers then manually place the installation template into the mold and align it with the positioning axis and elevation point measured by the instrument. The embedded bolts are then welded and fixed to the base. However, when workers place the installation template, it is difficult to position the embedded bolts accurately, and it is inconvenient to limit the embedded bolts. The embedded bolts are prone to shaking. In addition, during the welding process, the embedded bolts are prone to tilting and displacement, which can lead to inaccurate positioning of the embedded bolts and thus low construction efficiency. Summary of the Invention

[0004] To address the shortcomings or deficiencies of the existing technology, this invention provides an auxiliary adjustment device for pre-embedded bolts, which can perform multi-directional positioning and calibration of pre-embedded bolts, limit the position of pre-embedded bolts during the positioning process, and prevent the pre-embedded bolts from tilting during the welding process, thereby making the position of the pre-embedded bolts more accurate and improving construction efficiency.

[0005] An auxiliary adjustment device for pre-embedded bolts includes a base, a mold fixedly connected to the base, four contact plates placed on the top of the mold, a positioning frame slidably connected between the four contact plates, a positioning groove on the top of the positioning frame, a compression spring connected between the positioning frame and each of the four contact plates, four locking bolts threadedly connected to the lower part of the positioning frame, the outer wall of the mold contacting the four locking bolts, four fixing plates fixedly connected to the upper part of the positioning frame, a lifting mechanism provided on the fixing plate, and a pushing mechanism provided on the lifting mechanism.

[0006] To further explain, the lifting mechanism includes guide frames, with the tops of the four fixed plates all fixedly connected to the guide frames. Two guide frames form a group, and guide plates are fixedly connected to the four guide frames. Sliding plates are slidably connected to the four guide frames. Pre-embedded bolts pass between the fixed plates and the sliding plates. Nuts are threadedly connected to the upper parts of the four pre-embedded bolts, with the bottom of the nuts contacting the top of the sliding plates. Lifting rods are slidably connected to the four guide frames.

[0007] To further explain, the pushing mechanism includes a pushing frame, and the pushing frame is slidably connected between the two guide frames in each group. Two guide frames are fixedly connected to the two pushing frames. The two guide frames on the same pushing frame form a group. A locking block is slidably connected to each guide frame. A support spring is connected between the guide frame and the locking block. Guide rods are fixedly connected to the top of the four lifting rods.

[0008] To further explain, each of the guide frames is provided with a long guide ramp and a short guide ramp, and each of the guide frames has a limit slot on its upper part.

[0009] To further explain, each of the card blocks has a pressing slope at the bottom.

[0010] Further explanation: The system also includes a rotating mechanism disposed on the sliding plate. The rotating mechanism includes guide rings, which are fixedly connected to all four sliding plates. Each guide ring has a protrusion. A rotating rod is rotatably connected to each of the four fixed plates. Each rotating rod has a guide groove, and the rotating rod passes through the guide ring. The protrusion on the guide ring is located within the guide groove on the rotating rod. Three fixing blocks are fixedly connected to the bottom of each fixed plate. The three fixing blocks on the same fixed plate form a group, and a rotating ring is rotatably connected between the three fixing blocks in each group. Each of the four rotating rings has a toothed groove, and a rubber ring is fixedly connected to each of the four rotating rings. A rotating gear is fixedly connected to the bottom end of each of the four rotating rods, and the rotating gear meshes with the toothed groove on the rotating ring.

[0011] To further explain, all four rubber rings are provided with compression ramps.

[0012] Further explanation: It also includes a clamping mechanism, which is disposed on the rotating rod. The clamping mechanism includes a rotating protrusion. Each of the four rotating rods is fixedly connected to a rotating protrusion. Each of the four fixed plates is slidably connected to a push rod. Each push rod has a push slope at the end away from the rotating protrusion. Each of the four fixed plates is slidably connected to a transmission rod. The top end of the transmission rod contacts the push slope on the push rod. Each of the four transmission rods is fixedly connected to a compression ring at the bottom end. The compression ring is sleeved on the rubber ring.

[0013] The beneficial effects of this invention are as follows: First, the workers measure the position of the elevation point and mark it on the outer surface of the mold. Then, the workers place the device on the mold, aligning the positioning groove on the positioning frame with the positioning axis. The workers press the positioning frame down to a suitable position, aligning the bottom of the positioning frame with the elevation point marked on the outer surface of the mold. Then, the workers tighten the four locking bolts, which together limit the positioning frame, thus positioning it correctly. Next, the workers pass the four pre-embedded bolts through the four fixed plates and four sliding plates. The sliding plates then move the nuts and pre-embedded bolts upward a certain distance. Since the upward movement of the pre-embedded bolts is constant and the positioning frame is aligned with the elevation point marked on the outer surface of the mold, the pre-embedded bolts can be moved to the accurate position. Then, the workers weld the four pre-embedded bolts to the base. In this way, the pre-embedded bolts can be calibrated and positioned from multiple angles, and the pre-embedded bolts can be limited during the positioning process, making their position more accurate and thus improving construction efficiency.

[0014] When the lifting rod moves the tension spring and sliding plate upwards, the sliding plate moves the guide ring upwards. The rubber ring then frictionally limits the pre-embedded bolt. Simultaneously, the rotation of the rubber ring causes the pre-embedded bolt to rotate, bringing its lower part into contact with the base. As the rotating rod drives the rotating protrusion to continue rotating, the rubber ring further frictionally limits the pre-embedded bolt. This prevents the pre-embedded bolt from tilting or shifting during welding, making it more stable and accurate in position, thus improving construction efficiency. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the first three-dimensional structure of the present invention.

[0016] Figure 2 This is a schematic diagram of the second three-dimensional structure of the present invention.

[0017] Figure 3 This is a partial cross-sectional three-dimensional structural schematic diagram of the lifting mechanism of the present invention.

[0018] Figure 4 This is a partial three-dimensional structural diagram of the driving mechanism of the present invention.

[0019] Figure 5 This is a schematic diagram of the first partial three-dimensional structure of the lifting mechanism of the present invention.

[0020] Figure 6 This is a three-dimensional structural diagram of the actuating mechanism of the present invention.

[0021] Figure 7 This is a schematic diagram of the second partial three-dimensional structure of the lifting mechanism of the present invention.

[0022] Figure 8 This is a partial three-dimensional structural diagram of the lifting mechanism and the rotating mechanism of the present invention.

[0023] Figure 9 This is a partial three-dimensional structural diagram of the rotating mechanism of the present invention.

[0024] Figure 10 This is a three-dimensional structural diagram of the first part of the clamping mechanism of the present invention.

[0025] Figure 11 This is a three-dimensional structural diagram of the second part of the clamping mechanism of the present invention.

[0026] Figure 12 This is a cross-sectional three-dimensional structural diagram of the rubber ring, transmission rod, and extrusion ring of the present invention.

[0027] Figure 13 This is a three-dimensional structural diagram of the guide frame, locking block, and supporting spring of the present invention.

[0028] In the attached diagrams: 1: Base, 2: Mold, 21: Contact plate, 3: Positioning frame, 31: Compression spring, 4: Locking bolt, 5: Fixing plate, 61: Guide frame, 611: Guide plate, 62: Sliding plate, 63: Embedded bolt, 64: Nut, 65: Lifting rod, 66: Tension spring, 71: Push frame, 72: Guide frame, 73: Locking block, 74: Support spring, 75: Guide rod, 81: Guide ring, 82: Rotating rod, 83: Fixing block, 84: Rotating ring, 85: Rubber ring, 86: Rotating gear, 91: Rotating protrusion, 92: Push rod, 93: Transmission rod, 94: Extrusion ring. Detailed Implementation

[0029] All standard parts used in this invention can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, welding, and bonding that are mature in the prior art, and will not be described in detail here.

[0030] Example 1: An auxiliary adjustment device for pre-embedded bolts, such as Figures 1-13 As shown, the device includes a base 1, on which a mold 2 is bolted. Four contact plates 21 are placed on the top of the mold 2, and a positioning frame 3 is slidably connected between the four contact plates 21. The top of the positioning frame 3 has a positioning groove. A compression spring 31 is connected to the positioning frame 3 and the four contact plates 21 through hooks. Four locking bolts 4 are threadedly connected to the lower part of the positioning frame 3. The outer wall of the mold 2 is in contact with the four locking bolts 4. Four fixing plates 5 are welded to the upper part of the positioning frame 3. A lifting mechanism is provided on the fixing plates 5, and a pushing mechanism is provided on the lifting mechanism.

[0031] The lifting mechanism includes a guide frame 61. The top of each of the four fixed plates 5 is welded with a guide frame 61. Two guide frames 61 form a group. Guide plates 611 are welded to each of the four guide frames 61. Sliding plates 62 are slidably connected to each of the four guide frames 61. Pre-embedded bolts 63 pass between the fixed plates 5 and the sliding plates 62. Nuts 64 are threadedly connected to the upper part of each of the four pre-embedded bolts 63. The bottom of the nuts 64 contacts the top of the sliding plates 62. Lifting rods 65 are slidably connected to each of the four guide frames 61.

[0032] The pushing mechanism includes a pushing frame 71. Each set of two guide frames 61 are slidably connected to the pushing frame 71. Two guide frames 72 are welded onto each of the two pushing frames 71. The two guide frames 72 on the same pushing frame 71 form a set. Each guide frame 72 is provided with a long guide slope and a short guide slope. Each guide frame 72 has a limit slot on its upper part. Each guide frame 72 is slidably connected to a locking block 73. The locking block 73 is used to limit the pre-embedded bolt 63. Each locking block 73 has a pressing slope at its lower part. A support spring 74 is connected between the guide frame 72 and the locking block 73 through a hook. Guide rods 75 are welded to the top of each of the four lifting rods 65.

[0033] First, the staff measures the elevation points and marks them on the outer surface of mold 2. Then, the staff places the device on mold 2, aligning the positioning groove on the positioning frame 3 with the positioning axis. The top of mold 2 contacts the bottom of the four contact plates 21, and the compression spring 31 cushions the device. The staff presses the positioning frame 3 down to the appropriate position, aligning the bottom of the positioning frame 3 with the marked elevation points on the outer surface of mold 2. Then, the four locking bolts 4 are tightened, and the outer wall of mold 2 contacts all four locking bolts 4. The four locking bolts 4 collectively limit the positioning frame 3, thus positioning it correctly. Finally, the staff inserts four pre-embedded bolts 63 through the four fixed plates 5 and the four sliding plates 62 respectively. The bottoms of the four nuts 64 will contact the tops of the four sliding plates 62 respectively. Then, the worker will push the two pushers 71 to move closer to each other. The movement of the two pushers 71 will drive the two sets of guides 72 to move closer to each other. The upper part of the guides 72 will move above the pre-embedded bolts 63. The movement of the guides 72 will drive the locking block 73 and the support spring 74 to move horizontally. The guide short inclined surface on the guides 72 will contact the upper part of the guide rod 75. The guides 72 will squeeze the guide rod 75 to move upward. The upward movement of the guide rod 75 will drive the lifting rod 65 to move upward. The upward movement of the lifting rod 65 will drive the tension spring 66 and the sliding plate 62 to move upward. The upward movement of the sliding plate 62 will drive the nuts 64 to move upward. When the nut 64 moves upward, it will cause the embedded bolt 63 to move upward a certain distance. The embedded bolt 63 moves upward a certain distance, and the positioning frame 3 is aligned with the elevation point marked on the outer surface of the mold 2. Therefore, the embedded bolt 63 can move to the accurate position. The top of the embedded bolt 63 will contact the upper part of the push frame 71. The push frame 71 and the sliding plate 62 will jointly clamp and limit the embedded bolt 63. The upper part of the guide rod 75 will contact the guide inclined surface on the guide frame 72. The guide frame 72 will squeeze the guide rod 75 to continue moving upward. The upward movement of the guide rod 75 will drive the lifting rod 65 to move upward. The tension spring 66 will be stretched. The upper part of the guide rod 75 will contact the squeezing inclined surface at the bottom of the clamping block 73. The guide rod 75 will push the clamping block 73. 3. Moving upwards, the support spring 74 is stretched, and then the upper part of the guide rod 75 moves into the limiting slot on the guide frame 72. The guide rod 75 disengages from the locking block 73, and the support spring 74 resets. The reset of the support spring 74 causes the locking block 73 to move downwards and reset, limiting the guide rod 75. Then, the worker welds the four pre-embedded bolts 63 to the base 1. Next, the worker pushes the two push frames 71 to move away from each other and reset. The reset of the two push frames 71 causes the two sets of guide frames 72 to move away from each other and reset, disengaging the guide frame 72 from the guide rod 75. The tension spring 66 resets, causing the lifting rod 65 to move downwards.Then, the guide rod 75, lifting rod 65, tension spring 66, and sliding plate 62 will all move downwards and reset under the action of gravity. The sliding plate 62 will disengage from the nut 64. At the same time, the worker will release the four locking blocks 73, and the support spring 74 will reset again. The reset of the support spring 74 will drive the four locking blocks 73 to move downwards and reset. Next, the worker will rotate and remove the four nuts 64, and rotate the four locking bolts 4 in the opposite direction. The mold 2 will disengage from the four locking bolts 4. The worker will pull the device upwards to disengage from the four embedded bolts 63. The mold 2 will disengage from the four contact plates 21. Then, the worker will pull the four locking blocks 73 upwards, and the support spring 74 will be stretched again. Finally, the worker will pour concrete into the mold 2. After the concrete solidifies, the positioning and installation of the embedded bolts 63 will be completed. In this way, the embedded bolts 63 can be calibrated and positioned from multiple angles, and the embedded bolts 63 can be limited during the positioning process, making the position of the embedded bolts 63 more accurate, thereby improving construction efficiency.

[0034] Example 2: Based on Example 1, such as Figures 8-12 As shown, it also includes a rotating mechanism, which is mounted on the sliding plate 62. The rotating mechanism includes guide rings 81, and the guide rings 81 are bolted to all four sliding plates 62. Each guide ring 81 has a protrusion, and rotating rods 82 are rotatably connected to all four fixed plates 5. Each rotating rod 82 has a guide groove, and the rotating rod 82 passes through the guide ring 81. The protrusion on the guide ring 81 is located in the guide groove on the rotating rod 82. The guide ring 81 is used to compress the rotating rod 82 to rotate. Three fixing blocks 83 are welded to the bottom of each plate 5. The three fixing blocks 83 on the same fixing plate 5 form a group. Each group of three fixing blocks 83 is rotatably connected to a rotating ring 84. The four rotating rings 84 are provided with toothed grooves. Rubber rings 85 are fixedly connected to the four rotating rings 84. The rubber rings 85 are used to frictionally limit the pre-embedded bolts 63. The four rubber rings 85 are provided with compression inclined surfaces. The bottom ends of the four rotating rods 82 are connected to rotating gears 86 through flat keys. The rotating gears 86 mesh with the toothed grooves on the rotating rings 84.

[0035] It also includes a clamping mechanism, which is disposed on the rotating rod 82. The clamping mechanism includes a rotating protrusion 91. Each of the four rotating rods 82 is connected to the rotating protrusion 91 by a flat key. Each of the four fixed plates 5 is slidably connected to a push rod 92. Each push rod 92 has a push inclined surface at the end away from the rotating protrusion 91. Each of the four fixed plates 5 is slidably connected to a transmission rod 93. The top end of the transmission rod 93 contacts the push inclined surface on the push rod 92. Each of the four transmission rods 93 is fixedly connected to a compression ring 94. The compression ring 94 is sleeved on the rubber ring 85. The compression ring 94 is used to compress the rubber ring 85 to produce deformation.

[0036] When the lifting rod 65 moves the tension spring 66 and the sliding plate 62 upwards, the sliding plate 62 moves the guide ring 81 upwards. The upward movement of the guide ring 81 causes it to press against the rotating rod 82 along the guide groove on the rotating rod 82, causing it to rotate. The rotation of the rotating rod 82 causes the rotating protrusion 91 and the rotating gear 86 to rotate. The rotation of the rotating protrusion 91 pushes the push rod 92 horizontally, which in turn pushes the transmission rod 93 downwards. The downward movement of the transmission rod 93 causes the compression ring 94 to move downwards. The compression ring 94 contacts the compression slope on the rubber ring 85, causing it to deform inwards. The rubber ring 85 then frictionally limits the movement of the pre-embedded bolt 63. Simultaneously, the rotation of the rotating gear 86 drives the rotating ring 84 to rotate. The rotation causes the rubber ring 85 to rotate, which in turn causes the embedded bolt 63 to rotate, making the lower part of the embedded bolt 63 contact the base 1. As the rotating rod 82 drives the rotating protrusion 91 to continue rotating, the rotating protrusion 91 pushes the push rod 92 to continue moving horizontally. The horizontal movement of the push rod 92 pushes the transmission rod 93 to continue moving downward. The downward movement of the transmission rod 93 causes the compression ring 94 to continue moving downward. The compression ring 94 compresses the rubber ring 85 to further deform inward. The rubber ring 85 further frictionally limits the embedded bolt 63. In this way, the embedded bolt 63 can be prevented from tilting or shifting during the welding process, making the embedded bolt 63 more stable during the welding process, thereby making the position of the embedded bolt 63 more accurate and further improving the construction efficiency.

[0037] When the guide frame 72 disengages from the guide rod 75, the tension spring 66 and the sliding plate 62 will move downwards and reset under the action of gravity. The reset of the sliding plate 62 will drive the guide ring 81 to move downwards and reset. The downward reset of the guide ring 81 will squeeze the rotating rod 82 to rotate in the opposite direction. The reverse rotation of the rotating rod 82 will drive the rotating protrusion 91 and the rotating gear 86 to rotate in the opposite direction. The reverse rotation of the rotating gear 86 will drive the rotating ring 84 to rotate in the opposite direction. At the same time, the rubber ring 85 will rebound. The rebound of the rubber ring 85 will squeeze the compression ring 94 to move upwards and reset. The reset of the compression ring 94 will drive the transmission rod 93 to move upwards and reset. The reset of the transmission rod 93 will squeeze the push rod 92 to move horizontally in the opposite direction and reset.

[0038] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. An auxiliary adjustment device for pre-embedded bolts, characterized in that: The device includes a base (1), on which a mold (2) is fixedly connected. Four contact plates (21) are placed on the top of the mold (2). A positioning frame (3) is slidably connected between the four contact plates (21). A positioning groove is opened on the top of the positioning frame (3). A compression spring (31) is connected between the positioning frame (3) and the four contact plates (21). Four locking bolts (4) are threadedly connected to the lower part of the positioning frame (3). The outer wall of the mold (2) is in contact with the four locking bolts (4). Four fixing plates (5) are fixedly connected to the upper part of the positioning frame (3). A lifting mechanism is provided on the fixing plate (5). A pushing mechanism is provided on the lifting mechanism. The lifting mechanism includes a guide frame (61), and the top of each of the four fixed plates (5) is fixedly connected to the guide frame (61). Two guide frames (61) form a group, and guide plates (611) are fixedly connected to each of the four guide frames (61). Sliding plates (62) are slidably connected to each of the four guide frames (61). A pre-embedded bolt (63) passes between the fixed plate (5) and the sliding plate (62). Nuts (64) are threadedly connected to the upper part of each of the four pre-embedded bolts (63). The bottom of the nuts (64) contacts the top of the sliding plates (62). Lifting rods (65) are slidably connected to each of the four guide frames (61). The pushing mechanism includes a pushing frame (71), and the pushing frame (71) is slidably connected between the two guide frames (61) in each group. Two guide frames (72) are fixedly connected to the two pushing frames (71). The two guide frames (72) on the same pushing frame (71) form a group. Each guide frame (72) is slidably connected to a locking block (73). A support spring (74) is connected between the guide frame (72) and the locking block (73). The top of the four lifting rods (65) is fixedly connected to a guide rod (75). The staff pushes the two pushers (71) closer together. The movement of the two pushers (71) will drive the two sets of guide frames (72) to move closer to each other. The upper part of the guide frame (72) will move above the pre-embedded bolt (63). The movement of the guide frame (72) will drive the locking block (73) and the support spring (74) to move horizontally. The guide short inclined surface on the guide frame (72) will contact the upper part of the guide rod (75). The guide frame (72) will squeeze the guide rod (75) to move upward. The upward movement of the guide rod (75) will drive the lifting rod (65) to move upward. The upward movement of the lifting rod (65) will lead to... The dynamic tension spring (66) and the sliding plate (62) both move upward. The upward movement of the sliding plate (62) will drive the nut (64) to move upward. The upward movement of the nut (64) will drive the embedded bolt (63) to move upward a certain distance. The distance the embedded bolt (63) moves upward is constant. The positioning frame (3) is aligned with the elevation point marked on the outer surface of the mold (2). Therefore, the embedded bolt (63) moves to the accurate position. The top of the embedded bolt (63) will contact the upper part of the push frame (71). The push frame (71) and the sliding plate (62) will jointly clamp and limit the embedded bolt (63).

2. The pre-embedded bolt auxiliary adjustment device according to claim 1, characterized in that: It also includes a rotating mechanism, which is disposed on the sliding plate (62). The rotating mechanism includes a guide ring (81). The guide ring (81) is fixedly connected to each of the four sliding plates (62). Each guide ring (81) has a protrusion. Rotating rods (82) are rotatably connected to each of the four fixed plates (5). Each rotating rod (82) has a guide groove. The rotating rod (82) passes through the guide ring (81). The protrusion on the guide ring (81) is located in the guide groove on the rotating rod (82). Each of the fixed plates (5) has three fixed blocks (83) fixedly connected to its bottom. The three fixed blocks (83) on the same fixed plate (5) form a group. Each group of three fixed blocks (83) is rotatably connected to a rotating ring (84). The four rotating rings (84) have toothed grooves. The four rotating rings (84) are fixedly connected to a rubber ring (85). The bottom of the four rotating rods (82) is fixedly connected to a rotating gear (86). The rotating gear (86) meshes with the toothed grooves on the rotating rings (84).

3. The pre-embedded bolt auxiliary adjustment device according to claim 2, characterized in that: Each of the guide frames (72) is provided with a long guide ramp and a short guide ramp, and each of the guide frames (72) has a limit slot on its upper part.

4. The pre-embedded bolt auxiliary adjustment device according to claim 3, characterized in that: Each of the card blocks (73) has a compression ramp at the bottom.

5. The pre-embedded bolt auxiliary adjustment device according to claim 4, characterized in that: Each of the four rubber rings (85) is provided with a compression ramp.

6. The pre-embedded bolt auxiliary adjustment device according to claim 5, characterized in that: It also includes a clamping mechanism, which is set on the rotating rod (82). The clamping mechanism includes a rotating protrusion (91). The four rotating rods (82) are fixedly connected to the rotating protrusions (91). The four fixed plates (5) are slidably connected to the push rods (92). Each push rod (92) has a push slope at one end away from the rotating protrusion (91). The four fixed plates (5) are slidably connected to the transmission rods (93). The top end of the transmission rods (93) contacts the push slope on the push rods (92). The bottom ends of the four transmission rods (93) are fixedly connected to the compression rings (94). The compression rings (94) are sleeved on the rubber rings (85).

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