A self-adaptive roll biasing device for a stress rolling mill

Abstract

The utility model discloses a stress rolling mill roll self -adaptation deviation adjusting device, including the bottom plate, the bottom plate top fixedly connected with the roll plate, the bottom plate top fixedly connected with two baffle, and baffle one side is equipped with the opening, and two baffle opposite outside respectively fixedly connected with the rectangular frame, and two rectangular frames opposite outside respectively fixedly connected with the side plate, and the side plate one side is equipped with the opening, and the side plate and baffle opening are movably connected with the roll shaft, and the roll shaft all around fixedly connected with the roll block, and the roll shaft one side fixedly connected with the drive motor, and the side plate one side fixedly connected with the support frame, and support frame top movably connected with the drive motor, and the roll shaft both ends all around movably connected with the limit mechanism, and the limit mechanism both sides are fixedly connected in reset mechanism, and rectangular frame inside fixedly connected with limit mechanism and reset mechanism, the utility model discloses can ensure that roll block is stable in the position when rolling pressure, and this can effectively avoid the roll block because of the deviation influence rolling accuracy and plate quality, and has the elastic reset function.

Description

Technical Field

[0001] This utility model relates to the field of adaptive roll alignment technology, and in particular to an adaptive roll alignment device for stress rolling mills. Background Technology

[0002] In the field of metal rolling, the roll position accuracy of stress rolling mills directly affects the thickness uniformity and shape quality of sheet metal. During the rolling process, traditional rolling mills are prone to roll misalignment due to factors such as uneven sheet thickness and rolling force fluctuations, leading to decreased rolling accuracy and increased defect rate. Existing alignment devices mostly rely on manual intervention or mechanical rigid limits, which have problems such as slow response and low adjustment accuracy. Manual adjustment is time-consuming and labor-intensive, making it difficult to adapt to the needs of high-speed rolling. The mechanical structure lacks self-adaptive capabilities and cannot effectively compensate for dynamic misalignment. Moreover, the force transmission process is easily affected by angular deviations, resulting in inaccurate reset. In addition, the automation level of traditional devices is insufficient, and they cannot achieve real-time monitoring and dynamic adjustment of roll misalignment, which restricts the efficiency and stability of rolling production. Therefore, it is urgent to develop an alignment device that can sense roll misalignment in real time, accurately transmit force, and achieve automatic reset to improve the rolling accuracy and automation level of stress rolling mills, reduce labor costs, and meet the needs of high-precision sheet metal production.

[0003] The existing equipment lacks a precise and efficient limit and force transmission structure, making it unable to accurately monitor roll offset. During the force transmission process, it is easily affected by factors such as angle, resulting in untimely and inaccurate reset response. At the same time, the automatic reset function is not perfect, often requiring frequent manual intervention to adjust the roll position. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing an adaptive deviation adjustment device for stress rolling mill rolls.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An adaptive deflection device for a stress rolling mill roll includes a base plate, a roll plate fixedly connected to the top of the base plate, two partitions fixedly connected to the top of the base plate, and an opening on one side of each partition. Rectangular frames are fixedly connected to the opposite outer sides of the two partitions, and side plates are fixedly connected to the opposite outer sides of each of the two rectangular frames. An opening is also provided on one side of each side plate. Rollers are movably connected within the openings of the side plates and partitions.

[0007] As a further embodiment of this utility model: a roller block is fixedly connected around the roller shaft, a drive motor is fixedly connected to one side of the roller shaft, a support frame is fixedly connected to one side of the side plate, and a drive motor is movably connected to the top of the support frame. Limiting mechanisms are movably connected around both ends of the roller shaft, and a reset mechanism is fixedly connected to both sides of the limiting mechanism. The limiting mechanism and the reset mechanism are fixedly connected inside the rectangular frame.

[0008] As a further embodiment of this utility model: the limiting mechanism includes a connecting rod, a limiting cylinder, a movable ball, a fixed ball, a limiting plate, a movable block, a connecting plate, a limiting frame, a guide rod, a limiting block, and a movable rod, and the two fixed balls are respectively fixedly connected to the two ends of the roller shaft around its perimeter.

[0009] As a further embodiment of this utility model: the limiting plate is movably connected to the periphery of the fixed sphere, two movable blocks are respectively fixedly connected to both sides of the limiting plate, one end of the connecting rod is movably connected to the inside of the movable block, the movable sphere is fixedly connected to one side of the connecting rod, the limiting cylinder is movably connected to the periphery of the movable sphere, and two connecting plates are respectively fixedly connected to the upper and lower ends of the limiting plate.

[0010] As a further embodiment of this utility model: one end of the connecting plate is provided with an opening, the movable rod is movably connected to the inside of the opening on one side of the connecting plate, two limiting blocks are respectively fixedly connected to both sides of the movable rod, two guide rods are respectively movably connected to the inside of the two limiting blocks, the limiting frame is fixedly connected to the periphery of the two guide rods, and the two limiting frames are respectively fixedly connected to the inner walls of the upper and lower ends of the rectangular frame.

[0011] As a further embodiment of this utility model: the reset mechanism includes a first limiting frame, an arc-shaped frame, a round rod, a movable bar, a cylinder, a second limiting frame, a spring, a roller, an arc-shaped rod, a movable connecting block, a stop block, and a sliding block.

[0012] As a further embodiment of this utility model: the first limiting frame is fixedly connected to the inside of the rectangular frame, the arc-shaped frame is fixedly connected to the inside of the first limiting frame, the second limiting frame is fixedly connected to the inside of the arc-shaped frame, the cylinder is movably connected to the inside of the second limiting frame, and the cylinder is fixedly connected to one side of the limiting mechanism, the movable connecting block is fixedly connected to one side of the cylinder, and the round rod is fixedly connected to one side of the movable connecting block.

[0013] As a further embodiment of this utility model: the round rod passes through one side of the arc-shaped frame, two springs are respectively fixedly connected to the inner wall of the arc-shaped frame, two arc-shaped rods are respectively fixedly connected to the inner wall of the arc-shaped frame, and the springs are movably connected to the four sides of the arc-shaped rods, two stop blocks are respectively fixedly connected to one side of the two arc-shaped rods, and the stop blocks are fixedly connected to the inner wall of the arc-shaped frame, and two sliding blocks are respectively fixedly connected to one side of the two springs.

[0014] As a further embodiment of this utility model: the sliding block is movably connected to the periphery of the arc-shaped rod, the two rollers are movably connected to the sides of the sliding block and the interior of the arc-shaped frame respectively, the two movable bars are fixedly connected to one side of the two sliding blocks respectively, and one end of each of the two movable bars is movably connected to the interior of the upper and lower ends of the movable connecting block.

[0015] Compared with the prior art, this utility model provides an adaptive deviation adjustment device for stress rolling mill rolls, which has the following beneficial effects:

[0016] 1. This adaptive deflection device for stress rolling mill rolls uses a drive motor to rotate the roll shaft, which in turn rotates the roll blocks, thus rolling the workpiece. During rolling, if the roll blocks and the roll shaft deviate to a certain extent from their predetermined positions, a limiting mechanism in conjunction with a reset mechanism will limit the movement of both ends of the roll shaft to ensure stability. This ensures that the roll blocks remain in a stable position during rolling, effectively preventing the roll blocks from affecting rolling accuracy and sheet quality due to deflection. This ensures that the device can perform rolling operations stably and efficiently, reducing the defect rate and improving production efficiency and product quality.

[0017] 2. This adaptive roll alignment device for a stress rolling mill uses the movement of both ends of the roll shaft to allow a fixed ball to move within a limiting plate. The force of the roll shaft movement is transmitted to the reset mechanism through a movable block, connecting rod, and limiting cylinder. Because the movable ball moves within the limiting cylinder, the force transmitted from one end of the roll shaft is linearly transmitted to the reset mechanism, unaffected by the angle generated during roll shaft movement, thus avoiding deviations in force transmission. Simultaneously, the connecting plate, influenced by the movable rod and guide rod during movement, works in conjunction with the fixed ball to prevent the limiting plate from angulating with the roll shaft movement. Therefore, the force of the roll shaft movement can be accurately and without deviation transmitted to the reset mechanism. This helps the reset mechanism respond promptly and accurately, improves the device's ability to monitor and adjust roll shaft offset, and enhances the reliability and accuracy of the entire alignment device.

[0018] 3. This adaptive roll alignment device for a stress rolling mill transmits the force of the roll shaft movement to one side of the cylinder through a limiting mechanism. When one cylinder moves outward, the cylinder on the other side of the roll shaft moves inward, and the movable connecting block moves accordingly, causing the sliding block to compress or release the spring. As a result, when one end of the roll shaft moves to one side, there will be a certain pulling and pushing force on both sides, which can restore it to its original position. Thus, without frequent manual intervention, the offset roll shaft can be quickly returned to its original position, maintaining the correct position of the roll block during the rolling process, ensuring uniform thickness and good shape of the rolled plate, and improving the automation level of the device and the quality of the rolled products.

[0019] The parts of this device not covered herein are the same as or can be implemented using existing technologies. This utility model has a simple structure and is easy to operate. Attached Figure Description

[0020] Figure 1 This is a front view of a stress-adaptive roll alignment device for a rolling mill proposed in this utility model;

[0021] Figure 2 This is an internal structural diagram of a stress rolling mill roll adaptive alignment device proposed in this utility model;

[0022] Figure 3 This is an enlarged view of the limiting mechanism of the adaptive deviation adjustment device for stress rolling mill rolls proposed in this utility model;

[0023] Figure 4 This is a detailed view of the limiting structure of a stress rolling mill roll adaptive deviation adjustment device proposed in this utility model;

[0024] Figure 5 This is a structural diagram of the reset mechanism of a stress rolling mill roll adaptive deflection device proposed in this utility model;

[0025] Figure 6 This is a cross-sectional view of the reset mechanism of a stress rolling mill roll adaptive deflection device proposed in this utility model.

[0026] In the diagram: 1. Side plate; 2. Rectangular frame; 3. Roller shaft; 4. Partition plate; 5. Roll block; 6. Drive motor; 7. Support frame; 8. Limiting mechanism; 9. Reset mechanism; 10. Base plate; 11. Roll plate; 12. Supporting base column; 801. Connecting rod; 802. Limiting cylinder; 803. Movable ball; 804. Fixed ball; 805. Limiting plate; 806. Movable block; 807. Connecting plate; 808. Limiting frame; 809. Guide rod; 810. Limiting block; 811. Movable rod; 901. Limiting frame one; 902. Arc frame; 903. Round rod; 904. Movable strip; 905. Cylinder; 906. Limiting frame two; 907. Spring; 908. Roller; 909. Arc rod; 910. Movable connecting block; 911. Stop block; 912. Sliding block. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0028] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] An adaptive deviation adjustment device for stress rolling mill rolls, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, the system includes a base plate 10, a roller plate 11 fixedly connected to the top of the base plate 10, two partition plates 4 fixedly connected to the top of the base plate 10, and an opening on one side of each partition plate 4. Rectangular frames 2 are fixedly connected to the opposite outer sides of the two partition plates 4, and side plates 1 are fixedly connected to the opposite outer sides of each of the two rectangular frames 2. An opening is also provided on one side of each side plate 1. Rollers 3 are movably connected within the openings of the side plates 1 and the partition plates 4. Support columns 12 are fixedly connected to the four corners of the bottom of the base plate 10.

[0031] Roller blocks 5 are fixedly connected around the roller shaft 3. A drive motor 6 is fixedly connected to one side of the roller shaft 3. A support frame 7 is fixedly connected to one side of the side plate 1. The drive motor 6 is movably connected to the top of the support frame 7. Limiting mechanisms 8 are movably connected around both ends of the roller shaft 3. The two sides of the limiting mechanism 8 are fixedly connected to the reset mechanism 9. The limiting mechanism 8 and the reset mechanism 9 are fixedly connected inside the rectangular frame 2.

[0032] During operation, the drive motor 6 drives the roller shaft 3 to rotate, which in turn drives the rolling block 5 to rotate, thereby rolling the workpiece. When rolling, the rolling block 5 and the roller shaft 3 deviate to a certain extent from their predetermined positions. The limiting mechanism 8, in conjunction with the reset mechanism 9, limits both ends of the roller shaft 3 to stabilize it. This ensures that the rolling block 5 remains in a stable position during rolling, effectively preventing the rolling block 5 from affecting the rolling accuracy and the quality of the sheet metal due to deviation. This ensures that the device can perform rolling operations stably and efficiently, reducing the defect rate and improving production efficiency and product quality.

[0033] To ensure that the force exerted by the movement at both ends of roller 3 is transmitted to the reset mechanism 9, such as Figure 3 and Figure 4 As shown, the limiting mechanism 8 includes a connecting rod 801, a limiting cylinder 802, a movable ball 803, a fixed ball 804, a limiting plate 805, a movable block 806, a connecting plate 807, a limiting frame 808, a guide rod 809, a limiting block 810, and a movable rod 811, and the two fixed balls 804 are respectively fixedly connected to the two ends of the roller shaft 3 around its perimeter.

[0034] The limiting plate 805 is movably connected to the periphery of the fixed ball 804. Two movable blocks 806 are respectively fixedly connected to both sides of the limiting plate 805. One end of the connecting rod 801 is movably connected to the inside of the movable block 806. The movable ball 803 is fixedly connected to one side of the connecting rod 801. The limiting cylinder 802 is movably connected to the periphery of the movable ball 803. Two connecting plates 807 are respectively fixedly connected to the upper and lower ends of the limiting plate 805.

[0035] Furthermore, one end of the connecting plate 807 has an opening, the movable rod 811 is movably connected to the inside of the opening on one side of the connecting plate 807, two limiting blocks 810 are fixedly connected to both sides of the movable rod 811, two guide rods 809 are movably connected to the inside of the two limiting blocks 810, the limiting frame 808 is fixedly connected to the periphery of the two guide rods 809, and the two limiting frames 808 are fixedly connected to the inner walls of the upper and lower ends of the rectangular frame 2.

[0036] During operation, the movement of both ends of the roller shaft 3 causes the fixed ball 804 to move inside the limiting plate 805. The force of the roller shaft 3's movement is transmitted to the reset mechanism 9 through the movable block 806, connecting rod 801, and limiting cylinder 802. Since the movable ball 803 moves inside the limiting cylinder 802, the force transmitted from one end of the roller shaft 3 is transmitted to the reset mechanism 9 in a straight line, unaffected by the angle generated when the roller shaft 3 moves, thus avoiding deviation in force transmission. At the same time, the connecting plate 807 is affected by the movable rod 811 and guide rod 809 when it moves, and together with the fixed ball 804, the limiting plate 805 does not change angle with the movement of the roller shaft 3. Therefore, the force of the roller shaft 3's movement can be transmitted to the reset mechanism 9 accurately and without deviation. This helps the reset mechanism 9 to respond promptly and accurately, improves the device's ability to monitor and adjust the roller shaft 3's offset, and enhances the reliability and accuracy of the entire offset adjustment device.

[0037] To ensure that both ends of roller 3 can automatically reset after movement, such as Figure 5 and Figure 6As shown, the reset mechanism 9 includes a first limiting frame 901, an arc-shaped frame 902, a round rod 903, a movable bar 904, a cylinder 905, a second limiting frame 906, a spring 907, a roller 908, an arc-shaped rod 909, a movable connecting block 910, a stop block 911, and a sliding block 912.

[0038] The first limiting frame 901 is fixedly connected to the inside of the rectangular frame 2, the arc frame 902 is fixedly connected to the inside of the first limiting frame 901, the second limiting frame 906 is fixedly connected to the inside of the arc frame 902, the cylinder 905 is movably connected to the inside of the second limiting frame 906, and the cylinder 905 is fixedly connected to one side of the limiting mechanism 8, the movable connecting block 910 is fixedly connected to one side of the cylinder 905, and the round rod 903 is fixedly connected to one side of the movable connecting block 910.

[0039] The round rod 903 passes through one side of the arc frame 902, two springs 907 are fixedly connected to the inner wall of the arc frame 902, two arc rods 909 are fixedly connected to the inner wall of the arc frame 902, and the springs 907 are movably connected to the four sides of the arc rods 909. Two blocks 911 are fixedly connected to one side of the two arc rods 909, and the blocks 911 are fixedly connected to the inner wall of the arc frame 902. Two sliding blocks 912 are fixedly connected to one side of the two springs 907.

[0040] Furthermore, the sliding block 912 is movably connected to the periphery of the arc-shaped rod 909, the two rollers 908 are movably connected to the two sides of the sliding block 912 and the interior of the arc-shaped frame 902 respectively, the two movable bars 904 are fixedly connected to one side of the two sliding blocks 912 respectively, and one end of each of the two movable bars 904 is movably connected to the interior of the upper and lower ends of the movable connecting block 910.

[0041] During operation, the force of the roller shaft 3 movement is transmitted to one side of the cylinder 905 through the limiting mechanism 8. When one cylinder 905 moves outward, the cylinder 905 on the other side of the roller shaft 3 moves inward, and the movable connecting block 910 moves accordingly, driving the sliding block 912 to compress or release the spring 907. As a result, when one end of the roller shaft 3 moves to one side, there will be a certain pulling and pushing force on both sides, which can reset it. Thus, without frequent manual intervention, the offset roller shaft 3 can be quickly returned to its original position, maintaining the correct position of the roll block 5 in the rolling process, ensuring uniform thickness and good shape of the rolled plate, and improving the automation level of the device and the quality of the rolled products.

[0042] Working principle: The drive motor 6 drives the roller shaft 3 to rotate, and the roller shaft 3 drives the rolling block 5 to rotate, thereby rolling the workpiece. When rolling, the rolling block 5 and the roller shaft 3 will deviate to a certain extent from their predetermined positions.

[0043] The fixed ball 804 moves inside the limiting plate 805. The force of the roller 3 moving is transmitted to the reset mechanism 9 through the movable block 806, connecting rod 801 and limiting cylinder 802. Since the movable ball 803 moves inside the limiting cylinder 802, the force transmitted at one end of the roller 3 is transmitted to the reset mechanism 9 in a straight line, without being affected by the angle generated when the roller 3 moves, thus avoiding deviation in force transmission. At the same time, the connecting plate 807 is affected by the movable rod 811 and guide rod 809 when it moves, and together with the fixed ball 804, the limiting plate 805 will not be angled when it moves with the roller 3.

[0044] The force of the roller shaft 3 moving is transmitted to one side of the cylinder 905 through the limiting cylinder 802. When one cylinder 905 moves outward, the cylinder 905 on the other side of the roller shaft 3 moves inward. The movable connecting block 910 moves accordingly, which drives the sliding block 912 to compress or release the spring 907. As a result, when one end of the roller shaft 3 moves to one side, there will be a certain pulling and pushing force on both sides, so that it can be reset.

[0045] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A stress rolling mill roll adaptive alignment device, comprising a base plate (10), characterized in that, A roller plate (11) is fixedly connected to the top of the base plate (10). Two partition plates (4) are fixedly connected to the top of the base plate (10). An opening is provided on one side of the partition plate (4). A rectangular frame (2) is fixedly connected to the opposite outer side of the two partition plates (4). A side plate (1) is fixedly connected to the opposite outer side of the two rectangular frames (2). An opening is provided on one side of the side plate (1). A roller shaft (3) is movably connected in the opening of the side plate (1) and the partition plate (4).

2. The adaptive deviation adjustment device for stress rolling mill rolls according to claim 1, characterized in that, Roller blocks (5) are fixedly connected around the roller shaft (3), a drive motor (6) is fixedly connected to one side of the roller shaft (3), a support frame (7) is fixedly connected to one side of the side plate (1), and a drive motor (6) is movably connected to the top of the support frame (7). Limiting mechanisms (8) are movably connected around both ends of the roller shaft (3), and the two sides of the limiting mechanism (8) are fixedly connected to the reset mechanism (9). The limiting mechanism (8) and the reset mechanism (9) are fixedly connected inside the rectangular frame (2).

3. The adaptive deviation adjustment device for stress rolling mill rolls according to claim 2, characterized in that, The limiting mechanism (8) includes a connecting rod (801), a limiting cylinder (802), a movable ball (803), a fixed ball (804), a limiting plate (805), a movable block (806), a connecting plate (807), a limiting frame (808), a guide rod (809), a limiting block (810), and a movable rod (811), and two fixed balls (804) are respectively fixedly connected to the two ends of the roller shaft (3).

4. The adaptive deviation adjustment device for stress rolling mill rolls according to claim 3, characterized in that, The limiting plate (805) is movably connected to the periphery of the fixed sphere (804), two movable blocks (806) are respectively fixedly connected to the two sides of the limiting plate (805), one end of the connecting rod (801) is movably connected to the inside of the movable block (806), the movable sphere (803) is fixedly connected to one side of the connecting rod (801), the limiting cylinder (802) is movably connected to the periphery of the movable sphere (803), and two connecting plates (807) are respectively fixedly connected to the upper and lower ends of the limiting plate (805).

5. The adaptive deviation adjustment device for stress rolling mill rolls according to claim 3, characterized in that, One end of the connecting plate (807) has an opening, the movable rod (811) is movably connected to the inside of the opening on one side of the connecting plate (807), the two limiting blocks (810) are fixedly connected to both sides of the movable rod (811), the two guide rods (809) are movably connected to the inside of the two limiting blocks (810), the limiting frame (808) is fixedly connected to the two guide rods (809) around the perimeter, and the two limiting frames (808) are fixedly connected to the inner walls of the upper and lower ends of the rectangular frame (2).

6. The adaptive deviation adjustment device for stress rolling mill rolls according to claim 2, characterized in that, The reset mechanism (9) includes a first limiting frame (901), an arc frame (902), a round rod (903), a movable bar (904), a cylinder (905), a second limiting frame (906), a spring (907), a roller (908), an arc rod (909), a movable connecting block (910), a stop block (911), and a sliding block (912).

7. The adaptive deviation adjustment device for stress rolling mill rolls according to claim 6, characterized in that, The first limiting frame (901) is fixedly connected to the inside of the rectangular frame (2), the arc frame (902) is fixedly connected to the inside of the first limiting frame (901), the second limiting frame (906) is fixedly connected to the inside of the arc frame (902), the cylinder (905) is movably connected to the inside of the second limiting frame (906), and the cylinder (905) is fixedly connected to one side of the limiting mechanism (8), the movable connecting block (910) is fixedly connected to one side of the cylinder (905), and the round rod (903) is fixedly connected to one side of the movable connecting block (910).

8. The adaptive deviation adjustment device for stress rolling mill rolls according to claim 6, characterized in that, The round rod (903) passes through one side of the arc frame (902), two springs (907) are fixedly connected to the inner wall of the arc frame (902), two arc rods (909) are fixedly connected to the inner wall of the arc frame (902), and the springs (907) are movably connected to the four sides of the arc rods (909). Two blocks (911) are fixedly connected to one side of the two arc rods (909), and the blocks (911) are fixedly connected to the inner wall of the arc frame (902). Two sliding blocks (912) are fixedly connected to one side of the two springs (907).

9. The adaptive deviation adjustment device for stress rolling mill rolls according to claim 6, characterized in that, The sliding block (912) is movably connected to the periphery of the arc-shaped rod (909), and the two rollers (908) are movably connected to the sides of the sliding block (912) and the interior of the arc-shaped frame (902), respectively. The two movable bars (904) are fixedly connected to one side of the two sliding blocks (912), and one end of each of the two movable bars (904) is movably connected to the interior of the upper and lower ends of the movable connecting block (910).

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