Bistable device for strip steel conveying

Abstract

The utility model discloses a strip steel conveying bistable device which comprises a base, a first supporting mechanism, a first stable roller assembly, a second stable roller assembly and a driver, the first supporting mechanism is installed on the base, and the first stable roller assembly and the second stable roller assembly are installed on the first supporting mechanism in an up-down mode. The first stabilizing roller assembly or the second stabilizing roller assembly is connected with the driver, the second supporting mechanism is located on the upstream of the first supporting mechanism, the third stabilizing roller assembly and the fourth stabilizing roller assembly are installed on the second supporting mechanism in an up-down mode, and the third stabilizing roller assembly and the fourth stabilizing roller assembly are connected with the driver. The first center of the third stabilizing roller assembly is located on a first vertical line, the second center of the fourth stabilizing roller assembly is located on a second vertical line, and the first vertical line and the second vertical line are not located on the same straight line. The utility model can effectively reduce the shaking of the strip steel.

Description

Technical Field

[0001] The utility model relates to strip production equipment, in particular to a double-stabilizing device for strip conveying. Background Art

[0002] Strip steel is a narrow and long steel plate with a relatively thin thickness produced by various rolling mills to meet the needs of different industrial sectors for industrial production of various metal or mechanical products. Strip steel is also called steel strip, with a width within 1300 mm and a length slightly different according to the size of each coil.

[0003] For the coiled strip steel that has been wound up, if it needs to be sheared, usually the wound steel coil needs to be loaded onto an uncoiler, and the strip head is sequentially passed through the uncoiler pinch rolls, circular shear, main pinch rolls, and outlet pinch rolls, and finally the strip head reaches a coiler. When the strip steel passes through the circular shear, the circular shear continuously shears the side edges of the advancing strip steel according to the set requirements, so that the width of the strip steel meets the needs of users.

[0004] Since the roundness of the steel coil on the uncoiler cannot reach 100%, the strip steel led by the steel coil after uncoiling will always vibrate. The strip steel sheared by the circular shear needs to be kept stable during the advancing process, otherwise the side edges of the sheared strip steel will be uneven. In the prior art, usually, a stabilizing mechanism for strip steel is arranged between the uncoiler pinch rolls and the circular shear. This stabilizing mechanism includes a frame, an upper stabilizing roll, a lower stabilizing roll, and a driver. The upper stabilizing roll and the lower stabilizing roll are symmetrically arranged, and the upper stabilizing roll and the lower stabilizing roll are respectively rotatably arranged on the frame, and the upper stabilizing roll or the lower stabilizing roll is connected to the driver.

[0005] For the above-mentioned stabilizing mechanism, since the upper stabilizing roll and the lower stabilizing roll are symmetrically arranged, the stability it provides for strip steel conveying is not very large, resulting in the strip steel still vibrating during the conveying process and the side edges of the strip steel being uneven after trimming. Summary of the Utility Model

[0006] The utility model provides a double-stabilizing device for strip steel conveying, which can effectively reduce the vibration of strip steel.

[0007] The technical solutions for solving the above technical problems are as follows:

[0008] Double-stabilizing device for strip steel conveying, comprising a base, a first support mechanism, a first stabilizing roller assembly, a second stabilizing roller assembly, and a driver. The first support mechanism is installed on the base, and the first stabilizing roller assembly and the second stabilizing roller assembly are installed on the first support mechanism one above the other. The first stabilizing roller assembly or the second stabilizing roller assembly is connected to the driver. It further includes a second support mechanism, a third stabilizing roller assembly, and a fourth stabilizing roller assembly. The second support mechanism is located upstream of the first support mechanism. The third stabilizing roller assembly and the fourth stabilizing roller assembly are installed on the second support mechanism one above the other. The first center of the third stabilizing roller assembly is located on a first vertical line, and the second center of the fourth stabilizing roller assembly is located on a second vertical line. The first vertical line and the second vertical line are not on the same straight line.

[0009] Since the strip steel passes through the third stabilizing roller assembly and the fourth stabilizing roller assembly, the third stabilizing roller assembly and the fourth stabilizing roller assembly pinch the strip steel. Due to the fact that the first vertical line and the second vertical line are not on the same straight line, the third stabilizing roller assembly and the fourth stabilizing roller assembly form a wrap angle on the strip steel, generating a tensile force on the strip steel. Therefore, when the strip steel is cut by the circular saw, through the action of the two sets of stabilizing rollers, namely the third stabilizing roller assembly and the fourth stabilizing roller assembly, and the first stabilizing roller assembly and the second stabilizing roller assembly, the strip steel is kept in a tensioned state, greatly reducing the strip steel jitter and avoiding strip steel slack, thereby keeping the cut edge of the strip steel flat.

[0010] In summary, the advantages of the present utility model are as follows:

[0011] The strip steel jitter passing through between the third stabilizing roller assembly and the fourth stabilizing roller assembly can be effectively reduced by the third stabilizing roller assembly and the fourth stabilizing roller assembly; the first stabilizing roller assembly and the second stabilizing roller assembly further reduce the influence of the strip steel jitter between these two stabilizing roller assemblies on the circular saw cutting edge. Therefore, the above-mentioned double-stabilizing roller structure creates a good cutting edge environment for the circular saw and avoids the situation of uneven cut edges of the strip steel. Description of the Drawings

[0012] Figure 1 Three-dimensional view of the double-stabilizing device for strip steel conveying in the present utility model.

[0013] Figure 2 Front view of the double-stabilizing device for strip steel conveying in the present utility model.

[0014] Figure 3 Three-dimensional view of the first support mechanism and the first stabilizing roller assembly and the second stabilizing roller assembly.

[0015] Figure 4 Three-dimensional view of the second support mechanism and the third stabilizing roller assembly and the fourth stabilizing roller assembly.

[0016] Figure 5It is the front view of the second support mechanism, the third stabilizing roller assembly and the fourth stabilizing roller assembly.

[0017] Figure 6 It is the perspective view of the third stabilizing roller assembly and the fourth stabilizing roller assembly.

[0018] Marks in the attached drawings:

[0019] Base 1, first support mechanism 2, fixed seat 2a, movable frame 2b, drive component 2c, first stabilizing roller assembly 3, second stabilizing roller assembly 4, driver 5, second support mechanism 6, bracket 6a, sliding seat 6b, lifting driver 6c, support body 6d, adjusting seat 6e, adjusting screw 6f, linear guide 6g, slider 6h, guide plate 6i, adjusting support 6j, lifting seat 6k, adjusting bolt 6m, strip hole 6n, third stabilizing roller assembly 7, third roller 7a, third bearing seat assembly 7b, fourth stabilizing roller assembly 8, fourth roller 8a, fourth bearing seat assembly 8b, adjusted seat 8c, mounting seat 9, frame 10, guiding frame 11, guiding wheel 12, swing driver 13, first bolt 14, locknut 15, second center O2, first center O1, on the first vertical line L1, second vertical line L2. Specific embodiments

[0020] The present utility model will be further described in detail below in conjunction with the attached drawings and specific embodiments.

[0021] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0022] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0023] In the present utility model, unless otherwise clearly defined and limited, terms such as "installation", "connection", "linkage", "fixation" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral body; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0024] In the present utility model, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0025] As Figures 1 to 6 shown, the double-stabilizing device for strip steel conveying of the present utility model includes a base 1, a first support mechanism 2, a first stabilizing roller assembly 3, a second stabilizing roller assembly 4, a driver 5, a second support mechanism 6, a third stabilizing roller assembly 7, and a fourth stabilizing roller assembly 8. The following will detail each part and the relationship between them.

[0026] The first support mechanism 2 is installed on the base 1. The first support mechanism 2 includes a fixed seat 2a, a movable frame 2b, and a driving component 2c. The fixed seat 2a is fixed to the base 1, the movable frame 2b is hinged to the fixed seat 2a, one end of the driving component 2c is connected to the fixed seat 2a, the other end of the driving component 2c is connected to the movable frame 2b. The driving component 2c is a cylinder or a hydraulic cylinder, and the driving component 2c is hinged to both the fixed seat 2a and the movable frame 2b. When the driving component 2c works, the driving component 2c drives the movable frame 2b to rotate, and the second stabilizing roller assembly 4 rotates following the movable frame 2b.

[0027] The first stabilizing roller assembly 3 and the second stabilizing roller assembly 4 are installed on the first support mechanism 2 one above the other. The first stabilizing roller assembly 3 is installed on the fixed seat 2a, and the second stabilizing roller assembly 4 is installed on the movable frame 2b. The first stabilizing roller assembly 3 or the second stabilizing roller assembly 4 is connected to the driver 5. In this embodiment, the first stabilizing roller assembly 3 is located below the second stabilizing roller assembly 4, and the first stabilizing roller assembly 3 is connected to the driver 5, and the driver 5 is a motor. In the present utility model, the second stabilizing roller assembly 4 is rotated and pressed down by a hydraulic cylinder through the movable frame 2b, and this structure has the advantages of a large force arm and good stability.

[0028] The first stabilizing roll assembly 3 includes a first roll and a first bearing block assembly. The first roll is connected to the first bearing block assembly, and the first bearing block assembly is fixed to the fixed seat 2a. The second stabilizing roll assembly 4 includes a second roll and a second bearing block assembly. The second roll is connected to the second bearing block assembly, and the second bearing block assembly is fixed to the movable frame 2b. Both the first bearing block assembly and the second bearing block assembly are composed of a bearing block and bearings installed in the bearing block.

[0029] The second support mechanism 6 is located upstream of the first support mechanism 2. The third stabilizing roll assembly 7 and the fourth stabilizing roll assembly 8 are installed on the second support mechanism 6 one above the other. The second support mechanism 6 includes a bracket 6a, a sliding seat 6b, a lifting drive 6c, and a lower support. The bracket 6a is fixed to the base 1. The sliding seat 6b is slidably engaged with the bracket 6a. The bracket 6a is provided with a linear guide 6g, and the sliding seat 6b is provided with a slider 6h. The slider 6h is slidably engaged with the linear guide 6g. The third stabilizing roll assembly 7 includes a third roll 7a and a third bearing block assembly 7b. The third roll 7a is connected to the third bearing block assembly 7b. The third bearing block assembly 7b is composed of a bearing block and bearings installed in the bearing block.

[0030] The lifting drive 6c is fixed to the bracket 6a and is connected to the sliding seat 6b. The bracket 6a is in the shape of a doorframe. The lifting drive 6c is located at the top of the bracket 6a. The lifting drive 6c is composed of a fixed support and a cylinder or a hydraulic cylinder. Among them, the fixed support is fixed to the bracket 6a, and the hydraulic cylinder is fixed to the fixed support.

[0031] The lower support is arranged on the bracket 6a, and the fourth stabilizing roll assembly 8 is installed on the lower support. The first center O1 of the third stabilizing roll assembly 7 is located on the first vertical line L1, and the second center O2 of the fourth stabilizing roll assembly 8 is located on the second vertical line L2. The first vertical line L1 and the second vertical line L2 are not on the same straight line. Since the strip steel passes through the third stabilizing roll assembly 7 and the fourth stabilizing roll assembly 8, the third stabilizing roll assembly 7 and the fourth stabilizing roll assembly 8 pinch the strip steel. Since the first vertical line L1 and the second vertical line L2 are not on the same straight line, the third stabilizing roll assembly 7 and the fourth stabilizing roll assembly 8 form a wrap angle on the strip steel and generate a tensile force on the strip steel. Therefore, when the strip steel is cut by the circular saw, through the action of the two groups of stabilizing rolls, that is, the third stabilizing roll assembly 7 and the fourth stabilizing roll assembly 8, as well as the first stabilizing roll assembly 3 and the second stabilizing roll assembly 4, the strip steel is in a tensioned state, thereby avoiding the relaxation of the strip steel and further keeping the cut edge of the strip steel flat.

[0032] The lower support includes a support body 6d, an adjustment seat 6e, and an adjustment screw 6f. The end of the fourth stabilizing roller assembly 8 is located on the support body 6d. The adjustment seat 6e is fixed to the support body 6d. The adjustment seats 6e are provided on both sides of the end of the fourth stabilizing roller assembly 8. The adjustment screw 6f passes through the adjustment seat 6e and is threadedly connected to the adjustment seat 6e. The end of the fourth stabilizing roller assembly 8 is clamped by at least two adjustment screws 6f.

[0033] The fourth stabilizing roller assembly 8 includes a fourth roller 8a, a fourth bearing seat assembly 8b, and an adjustment seat 8c. The fourth roller 8a is connected to the fourth bearing seat assembly 8b. The adjustment seat 8c is fixed to the side of the fourth bearing seat assembly 8b. The adjustment seat 8c is clamped between the adjustment screws 6f.

[0034] As can be seen from the above, the third stabilizing roller assembly 7 is driven by a cylinder and vertically pressed under the guidance of a linear guide 6g and a slider 6h. The third stabilizing roller assembly 7 and the fourth stabilizing roller assembly 8 form a wrap angle for the strip steel. The position of the fourth stabilizing roller assembly 8 is manually adjusted by the adjustment screw 6f, thereby adjusting the size of the wrap angle.

[0035] The present utility model further includes a guiding mechanism located upstream of the fourth stabilizing roller assembly 8. The guiding mechanism includes a mounting seat 9, a frame 10, and a plurality of guiding components. The mounting seat 9 is fixed to the base 1. The frame 10 is connected to the mounting seat 9. The guiding components are mounted on the frame 10. Each guiding component includes a guiding frame 11 and a guiding wheel 12. The guiding frame 11 is fixed to the frame 10. The guiding wheel 12 is connected to the guiding frame 11. The guiding wheels 12 on adjacent two guiding components are arranged in a staggered manner.

[0036] The guiding mechanism further includes a swing drive 13. The frame 10 is hinged to the mounting seat 9. One end of the swing drive 13 is hinged to the base 1, and the other end of the swing drive 13 is hinged to the frame 10.

[0037] When threading the strip steel, the strip steel can be pulled onto the guiding mechanism. Through the supporting effect of the guiding mechanism, the burden of traction is reduced.

[0038] Such as Figure 4 and Figure 5 , the present utility model further includes a first support component for supporting the third stabilizing roller assembly 7. One end of the first support component is connected to the fourth stabilizing roller assembly 8, and the other end of the first support component cooperates with the third stabilizing roller assembly 7. The first support component includes a first bolt 14. A first threaded hole is provided on the fourth bearing seat assembly 8b. One end of the first bolt 14 is threadedly connected to the first threaded hole on the fourth bearing seat assembly 8b, and the other end of the first bolt 14 is a free end. When the third stabilizing roller assembly 7 moves towards the fourth stabilizing roller assembly 8 under the drive of the lifting drive 6c and the third bearing seat assembly 7b abuts against the first bolt 14, the third stabilizing roller assembly 7 cannot further move towards the fourth stabilizing roller assembly 8.

[0039] The first bolt 14 not only supports the third stabilizing roll assembly 7, but also, after rotating the first bolt 14, the distance between the third stabilizing roll assembly 7 and the fourth stabilizing roll assembly 8 can be controlled, that is, the distance between the third roll 7a and the fourth roll 8a can be controlled, so that the distance between the third roll 7a and the fourth roll 8a can be finely adjusted according to the thickness of the strip steel.

[0040] The first support assembly further includes a locknut 15. The locknut 15 is fixedly welded to the fourth bearing block assembly 8b. The first bolt 14 is threadedly connected to the locknut 15. Through the action of the locknut 15, the first bolt 14 can be prevented from loosening under the action of vibration force, so as to ensure the distance between the third roll 7a and the fourth roll 8a.

[0041] Such as Figure 2 , the present utility model further includes a second support assembly for supporting the second stabilizing roll assembly 4. One end of the second support assembly is connected to the first stabilizing roll assembly 3, and the other end of the second support assembly is matched with the second stabilizing roll assembly 4. The structure and connection method of the second support assembly refer to the first support assembly and will not be elaborated here.

[0042] The lower support further includes a height adjustment unit for adjusting the height of the fourth stabilizing roll assembly 8. The height adjustment unit includes a guide plate 6i, an adjustment support 6j, a lifting seat 6k, and an adjustment bolt 6m. The guide plate 6i is fixed to the bracket 6a, and the guide plate 6i and the bracket 6a are preferably fixed by welding. The adjustment support 6j is fixed to the guide plate 6i, and the adjustment support 6j and the guide plate 6i are preferably fixed by welding. The adjustment support 6j is provided with a second threaded hole (not shown in the figure). The lifting seat 6k is slidably matched with the guide plate 6i. A chute is provided on the guide plate 6i, and a slide rail is provided on the lifting seat 6k. The lifting seat 6k is slidably matched with the chute on the guide plate 6i through the slide rail. The lifting seat 6k is provided with a third threaded hole (not shown in the figure). The adjustment bolt 6m is threadedly connected to the second threaded hole on the adjustment support 6j. After passing through the second threaded hole on the adjustment support 6j, the adjustment bolt 6m is threadedly connected to the third threaded hole on the lifting seat 6k. The support body 6d is fixed to the lifting seat 6k, and the support body 6d and the lifting seat 6k are preferably fixed by welding.

[0043] After the guide plate 6i, the adjusting support 6j, the lifting seat 6k, and the adjusting bolt 6m are connected as described above, a lead screw mechanism is formed. When the adjusting bolt 6m is rotated, the adjusting bolt 6m drives the lifting seat 6k to move up and down along the guide plate 6i, and the lifting seat 6k drives the support body 6d to move up and down. Since the fourth stabilizing roller assembly 8 is located on the support body 6d, when the support body 6d moves up and down, the fourth stabilizing roller assembly 8 follows the support body 6d to move up and down. Since the height position of the fourth roller 8a in the fourth stabilizing roller assembly 8 is too high or too low, it is easy to cause an included angle between the input strip steel and the fourth stabilizing roller assembly 8. Therefore, by adjusting the height of the fourth stabilizing roller assembly 8, the height difference between the fourth stabilizing roller assembly 8 and the guiding mechanism is controlled, facilitating the control of the input angle of the steel strip, thereby reducing the wear of the strip steel.

[0044] In the present utility model, since the main function of the adjusting bolt 6m is to drive the lifting seat 6k to move up and down, and the auxiliary function is to support the lifting seat 6k, a fourth threaded hole (not shown in the figure) is provided on the guide plate 6i, and a strip-shaped hole 6n is also provided on the lifting seat 6k. When the lifting seat 6k is adjusted to the required position, a locking bolt (not shown in the figure) passes through the strip-shaped hole 6n and is threadedly connected to the fourth threaded hole on the guide plate 6i, thereby locking the lifting seat 6k and the guide plate 6i together as one body. This can reduce the force on the adjusting bolt 6m and avoid damage to the threads on the adjusting bolt 6m, the second threaded hole, and the third threaded hole.

[0045] Through the combination of the above two fine-tuning structures, not only is the strip steel prevented from being worn, but also different thickness strip steels can be adapted.

[0046] The above-disclosed is only a preferred embodiment of the present application. Of course, it cannot be used to limit the scope of the rights of the present utility model. Those of ordinary skill in the art can understand all or part of the structures of the above embodiments, and the equivalent changes made according to the claims of the present application still fall within the scope covered by the application.

Claims

1. Double-stabilizing device for strip steel conveying, comprising a base (1), a first support mechanism (2), a first stabilizing roller assembly (3), a second stabilizing roller assembly (4), and a driver (5). The first support mechanism (2) is installed on the base (1), and the first stabilizing roller assembly (3) and the second stabilizing roller assembly (4) are installed on the first support mechanism (2) one above the other. The first stabilizing roller assembly (3) or the second stabilizing roller assembly (4) is connected to the driver (5), characterized in that, It further includes a second support mechanism (6), a third stabilizing roller assembly (7), and a fourth stabilizing roller assembly (8). The second support mechanism (6) is located upstream of the first support mechanism (2). The third stabilizing roller assembly (7) and the fourth stabilizing roller assembly (8) are mounted on the second support mechanism (6) one above the other. The first center (O1) of the third stabilizing roller assembly (7) is located on the first vertical line (L1), and the second center (O2) of the fourth stabilizing roller assembly (8) is located on the second vertical line (L2). The first vertical line (L1) and the second vertical line (L2) are not on the same straight line.

2. The double-stabilizing device for strip steel conveying according to claim 1, characterized in that, The first support mechanism (2) includes a fixed seat (2a), a movable frame (2b), and a driving component (2c). The fixed seat (2a) is fixed to the base (1), the movable frame (2b) is hinged to the fixed seat (2a), one end of the driving component (2c) is connected to the fixed seat (2a), and the other end of the driving component (2c) is connected to the movable frame (2b). The first stabilizing roller assembly (3) is mounted on the fixed seat (2a), and the second stabilizing roller assembly (4) is mounted on the movable frame (2b).

3. The double-stabilizing device for strip steel conveying according to claim 1, characterized in that, The second support mechanism (6) includes a bracket (6a), a sliding seat (6b), a lifting driver (6c), and a lower support. The bracket (6a) is fixed to the base (1), the sliding seat (6b) is slidably engaged with the bracket (6a), the lifting driver (6c) is fixed to the bracket (6a), and the lifting driver (6c) is connected to the sliding seat (6b). The lower support is provided on the bracket (6a). The third stabilizing roller assembly (7) is mounted on the sliding seat (6b), and the fourth stabilizing roller assembly (8) is mounted on the lower support.

4. The double-stabilizing device for strip steel conveying according to claim 3, characterized in that, The lower support includes a support body (6d), an adjustment seat (6e), and an adjustment screw (6f). The end of the fourth stabilizing roller assembly (8) is located on the support body (6d). The adjustment seat (6e) is fixed to the support body (6d). The adjustment seats (6e) are provided on both sides of the end of the fourth stabilizing roller assembly (8). The adjustment screw (6f) passes through the adjustment seat (6e) and is threadedly connected to the adjustment seat (6e). The end of the fourth stabilizing roller assembly (8) is clamped by at least two adjustment screws (6f).

5. The double-stabilizing device for strip steel conveying according to claim 4, characterized in that, The fourth stabilizing roller assembly (8) includes a fourth roller (8a), a fourth bearing seat assembly (8b), and a seat to be adjusted (8c). The fourth roller (8a) is connected to the fourth bearing seat assembly (8b). The seat to be adjusted (8c) is fixed to the side of the fourth bearing seat assembly (8b). The seat to be adjusted (8c) is clamped between the adjustment screws (6f).

6. The double-stabilizing device for strip steel conveying according to any one of claims 1 to 5, characterized in that, It further includes a guiding mechanism located upstream of the fourth stabilizing roller assembly (8). The guiding mechanism includes a mounting seat (9), a frame (10), and a plurality of guiding components. The mounting seat (9) is fixed to the base (1), the frame (10) is connected to the mounting seat (9), and the guiding components are mounted on the frame (10). Each guiding component includes a guiding frame (11) and a guiding wheel (12). The guiding frame (11) is fixed to the frame (10), and the guiding wheel (12) is connected to the guiding frame (11). The guiding wheels (12) on adjacent two guiding components are arranged in a staggered manner.

7. The double-stabilizing device for strip steel conveying according to claim 6, characterized in that, The guiding mechanism further includes a swing driver (13). The frame (10) is hinged to the mounting base (9). One end of the swing driver (13) is hinged to the base (1), and the other end of the swing driver (13) is hinged to the frame (10).

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