A mill levelling device

Abstract

This application discloses a rolling mill leveling device, including a base with a connecting bracket on the upper side, a lower leveling roll group located below the connecting bracket, an upper leveling roll group located above the lower leveling roll group and forming a leveling gap with the lower leveling roll group, an adjustment mechanism located above the connecting bracket and connected to the upper leveling roll group, a cleaning mechanism located on the left side of the connecting bracket, a rotating access mechanism rotatably connected to the left side of the base, and an intermediate auxiliary conveying mechanism located on the lower left side of the connecting bracket and to the right of the cleaning mechanism. This application uses the rotating access mechanism to receive the strip unwound by the uncoiling device, the cleaning mechanism to clean impurities from the strip surface, the intermediate auxiliary conveying mechanism to guide the strip into the leveling gap, and the adjustment mechanism to adjust the size of the leveling gap, thereby achieving precise leveling of the strip thickness. This process effectively cleans impurities from the strip surface, avoiding damage to the leveling roll surface, and ensures the surface quality of the strip, meeting higher production and product quality standards.

Description

Technical Field

[0001] This application relates to the technical field of steel rolling production equipment, and more particularly to a rolling mill leveling device. Background Technology

[0002] Existing traditional rolling mill production lines include equipment such as uncoilers, levelers, rolling mills, and rewinders. However, existing rolling mill levelers directly connect to the steel coil strip output from the uncoiler and perform leveling treatment on the steel coil strip without cleaning the surface of the steel coil strip. This results in dust, oil stains, or debris adhering to the surface of the steel coil strip, which damages the surface of the leveling roll and easily affects the surface quality of the steel coil strip. In view of this, those skilled in the art urgently need to develop a new type of rolling mill leveling equipment to meet more practical application needs. Utility Model Content

[0003] The main objective of this application is to provide a rolling mill leveling device that aims to solve the aforementioned technical problems.

[0004] A rolling mill leveling device, comprising:

[0005] The base has a connecting bracket on its upper side;

[0006] The lower leveling roller assembly is mounted on the connecting bracket and located on the lower side of the connecting bracket;

[0007] The upper leveling roller group is mounted on the connecting bracket, located above the lower leveling roller group, and forms a leveling gap with the lower leveling roller group.

[0008] An adjustment mechanism is provided on the upper side of the connecting bracket, and its lower end is connected to the upper leveling roller group, which is used to drive the upper leveling roller group to move up and down to adjust the size of the leveling gap.

[0009] A cleaning mechanism, located on the left side of the connecting bracket, is used to clean the conveyor belt being fed into the leveling gap;

[0010] A rotating access mechanism is rotatably connected to the left side of the base for receiving the material strip that has been rotated and unfolded by the unwinding device, and for guiding the material strip to be conveyed towards the cleaning mechanism and the leveling gap.

[0011] An intermediate auxiliary conveying mechanism is located on the lower left side of the connecting bracket and on the right side of the cleaning mechanism. It is used to assist in the smooth conveying of the material belt from the cleaning mechanism to the leveling gap.

[0012] The cleaning mechanism in the rolling mill leveling equipment described above includes:

[0013] A front connecting frame is located on the left front side of the connecting bracket;

[0014] A rear connecting bracket is located on the left rear side of the connecting support;

[0015] The upper cleaning unit is located between the front connecting frame and the rear connecting frame and is used to rotate the upper surface of the cleaning material belt;

[0016] The lower cleaning unit is located below the upper cleaning unit and is used to rotate the lower surface of the cleaning material belt.

[0017] As described above, the rolling mill leveling equipment has a front left toothed column located on the left side and a front right guide column located on the right side of the front left toothed column inside the front connecting frame;

[0018] The rear connecting frame is provided with a rear left toothed post on the left side and a rear right guide post on the right side of the rear left toothed post.

[0019] The upper cleaning group includes:

[0020] The upper front sliding block is slidably connected to the front left toothed post and the front right guide post;

[0021] The upper rear sliding block is slidably connected to the left rear toothed post and the right rear guide post;

[0022] An upper longitudinal connecting beam is disposed between the front upper sliding block and the rear upper sliding block;

[0023] The upper cleaning belt assembly is located on the left side of the upper longitudinal connecting beam;

[0024] An upper cleaning drive assembly is located on the right front side of the upper longitudinal connecting beam and is connected to the upper cleaning belt assembly for driving the upper cleaning belt assembly to rotate.

[0025] An upper drive shaft is disposed between the front upper sliding block and the rear upper sliding block, with its front end extending into the front upper sliding block and engaging with the front left toothed post, and its rear end extending into the rear upper sliding block and engaging with the rear left toothed post.

[0026] The rear upper moving drive group is slidably connected to the rear side of the rear connecting frame, and its power output end is connected to the rear end of the upper drive shaft. It is used to drive the upper drive shaft to rotate, thereby driving the front upper sliding block and the rear upper sliding block to move up and down together with the upper longitudinal connecting beam, the upper cleaning belt group and the upper cleaning drive group.

[0027] As described above, the mill leveling equipment includes an upper cleaning belt assembly comprising a front upper drive wheel connected to the power output end of the upper cleaning drive assembly, a rear upper driven wheel located behind the front upper drive wheel, and an upper cleaning belt body wound between the front upper drive wheel and the rear upper driven wheel.

[0028] The upper cleaning unit of the rolling mill leveling equipment described above further includes:

[0029] The front upper suction cover is located on the front side of the upper cleaning belt assembly and is used to connect an external negative pressure suction device to absorb the debris and dust generated during the cleaning process of the upper cleaning belt assembly.

[0030] In the rolling mill leveling equipment described above, the upper cleaning group and the lower cleaning group are arranged symmetrically.

[0031] The rolling mill leveling equipment described above, wherein the rotating access mechanism includes:

[0032] The access plate is rotatably connected to the upper left side of the base on its right side.

[0033] The rotation drive assembly has its lower end located on the lower left side of the base, and its upper end connected to the lower side of the access plate.

[0034] As described above, the intermediate auxiliary conveying mechanism of the rolling mill leveling equipment includes connecting bearing seats arranged at intervals, and an intermediate rotating roller disposed between the two connecting bearing seats.

[0035] The mill leveling equipment described above further includes an auxiliary guide output mechanism rotatably connected to the right side of the base, the auxiliary guide output mechanism comprising:

[0036] The output guide plate is rotatably connected to the upper right side of the base on its left side.

[0037] The auxiliary guide drive group has its lower end located on the lower right side of the base, and its upper end connected to the output guide plate.

[0038] The auxiliary guide output mechanism of the rolling mill leveling equipment described above further includes:

[0039] An extension guide plate is slidably connected inside the output guide plate;

[0040] An extension drive assembly is disposed on the output guide plate, located on the lower side of the extension guide plate, and its right power output end is connected to the lower right side of the extension guide plate, for driving the extension guide plate to extend and retract along the lateral direction of the output guide plate.

[0041] Compared with the prior art, the above application has the following advantages:

[0042] This application's mill leveling equipment uses a rotating access mechanism to receive the steel coil strip unwound by the uncoiler. A cleaning mechanism then cleans the strip surface to remove impurities. An intermediate auxiliary conveying mechanism smoothly guides the strip into the leveling gap. An adjustment mechanism controls the vertical position of the upper leveling rollers to adjust the leveling gap, thereby achieving precise leveling of the strip thickness. In this process, this application not only effectively cleans impurities from the strip surface to avoid damage to the leveling rollers but also effectively ensures the surface quality of the strip. This, in turn, effectively guarantees the flatness and surface quality of the strip during subsequent rolling processes, further improving the rolling effect and meeting higher production requirements and product quality standards. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0044] Figure 1 This is a schematic diagram of the rolling mill leveling equipment of this application.

[0045] Figure 2 This is a partial exploded view of the cleaning mechanism described in the rolling mill leveling equipment of this application.

[0046] Figure 3 This is another partially exploded view of the cleaning mechanism described in the mill leveling equipment of this application.

[0047] Figure 4 This is a cross-sectional view of the hidden portion of the cleaning mechanism in the rolling mill leveling equipment of this application.

[0048] Figure 5 This is a schematic diagram showing the rear upper moving drive group slidably connected to the rear connecting frame in the rolling mill leveling equipment of this application. Detailed Implementation

[0049] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0050] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0051] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0052] like Figures 1 to 5 As shown, a rolling mill leveling device includes a base 21, a lower leveling roll group 22, an upper leveling roll group 23, an adjustment mechanism 24, a cleaning mechanism 25, a rotation access mechanism 26, and an intermediate auxiliary conveying mechanism 27.

[0053] Specifically, a connecting bracket 211 is provided on the upper side of the base 21; the lower leveling roller group 22 is disposed on the connecting bracket 211 and located below the connecting bracket 211; the upper leveling roller group 23 is disposed on the connecting bracket 211 and located above the lower leveling roller group 22, and a leveling gap is formed between them; the adjusting mechanism 24 is disposed on the upper side of the connecting bracket 211, and its lower end is connected to the upper leveling roller group 23, for driving the upper leveling roller group 23 to move up and down to adjust the leveling roller group 23. The size of the leveling gap; the cleaning mechanism 25 is located on the left side of the connecting bracket 211 and is used to clean the material belt conveyed to the leveling gap; the rotating access mechanism 26 is rotatably connected to the left side of the base 21 and is used to access the material belt that has been rotated and unfolded by the unwinding device, and guide the material belt to be conveyed to the cleaning mechanism 25 and the leveling gap; the intermediate auxiliary conveying mechanism 27 is located on the lower left side of the connecting bracket 211 and on the right side of the cleaning mechanism 25, and is used to assist the material belt in being smoothly conveyed from the cleaning mechanism 25 to the leveling gap.

[0054] The rolling mill leveling equipment of this application receives the steel coil strip unwound by the uncoiling device via a rotating access mechanism 26. The surface of the strip is then cleaned by a cleaning mechanism 25 to remove surface impurities. The intermediate auxiliary conveying mechanism 27 smoothly guides the strip into the leveling gap. The upper and lower positions of the leveling roller group 23 are controlled by an adjusting mechanism 24 to adjust the size of the leveling gap, thereby achieving precise leveling of the strip thickness. In this process, this application can not only effectively clean impurities on the strip surface to avoid damage to the leveling roller surface, but also effectively ensure the surface quality of the strip. This, in turn, can effectively ensure the flatness and surface quality of the strip in subsequent rolling processes, thereby further improving the rolling effect of the strip and meeting higher production requirements and product quality standards.

[0055] Furthermore, there are two sets of lower leveling roller groups 22, which are arranged at left and right intervals; there are also two sets of upper leveling roller groups 23, which are respectively arranged above each lower leveling roller group 22 to form two sets of leveling roller groups. Each set of upper leveling roller groups 23 and the corresponding lower leveling roller group 22 are provided with a leveling gap. The two sets of leveling roller groups are arranged back and forth along the conveying direction of the material belt to realize multi-segment leveling processing of the material belt.

[0056] Each of the lower leveling roller group 22 and each of the upper leveling roller group 23 includes multiple bearing connecting seats, a leveling roller disposed between two bearing connecting seats arranged symmetrically front and rear, and a leveling roller rotation drive motor connected to the leveling roller for driving the leveling roller to rotate. This technology is prior art and will not be described in detail here.

[0057] The number of adjustment mechanisms 24 is also 2 sets, which are respectively set above the two sets of upper leveling roller groups 23, and are used to drive the two sets of upper leveling roller groups 23 to move up and down independently to achieve segmented leveling.

[0058] Each of the adjustment mechanisms 24 includes a drive electric cylinder or a drive hydraulic cylinder, the power output end of which is connected to the corresponding upper leveling roller group 23 to drive it to move up and down, thereby achieving precise adjustment of the leveling gap size.

[0059] Furthermore, the cleaning mechanism 25 includes a front connecting frame 251, a rear connecting frame 252, an upper cleaning assembly 253, and a lower cleaning assembly 254;

[0060] The front connecting frame 251 is located on the left front side of the connecting bracket 211; the rear connecting frame 252 is located on the left rear side of the connecting bracket 211; the upper cleaning group 253 is located between the front connecting frame 251 and the rear connecting frame 252, and is used to rotate and clean the upper surface of the material belt; the lower cleaning group 254 is located below the upper cleaning group 253, and is used to rotate and clean the lower surface of the material belt. This application, through the arrangement of the front connecting frame 251 and the rear connecting frame 252, combined with the distribution of the upper cleaning group 253 and the lower cleaning group 254, can simultaneously rotate and clean the upper and lower surfaces of the material belt, achieving double-sided synchronous cleaning and significantly improving cleaning efficiency.

[0061] The front connecting frame 251 has a front left toothed post 2511 located on the left side and a front right guide post 2512 located on the right side of the front left toothed post 2511.

[0062] The rear connecting frame 252 has a rear left toothed post 2521 located on the left side and a rear right guide post 2522 located on the right side of the rear left toothed post 2521.

[0063] The upper cleaning assembly 253 includes a front upper sliding block 2531, a rear upper sliding block 2532, an upper longitudinal connecting beam 2533, an upper cleaning belt assembly 2534, an upper cleaning drive assembly 2535, an upper drive shaft 2536, and a rear upper moving drive assembly 2537.

[0064] The front upper sliding block 2531 is slidably connected to the front left toothed post 2511 and the front right guide post 2512;

[0065] The upper rear sliding block 2532 is slidably connected to the left rear toothed post 2521 and the right rear guide post 2522;

[0066] The upper longitudinal connecting beam 2533 is disposed between the front upper sliding block 2531 and the rear upper sliding block 2532;

[0067] The upper cleaning belt assembly 2534 is located on the left side of the upper longitudinal connecting beam 2533;

[0068] The upper cleaning drive assembly 2535 is located on the front right side of the upper longitudinal connecting beam 2533 and is connected to the upper cleaning belt assembly 2534 for driving the upper cleaning belt assembly 2534 to rotate.

[0069] The upper drive shaft 2536 is disposed between the front upper sliding block 2531 and the rear upper sliding block 2532, and its front end extends into the front upper sliding block 2531 and meshes with the front left toothed post 2511, and its rear end extends into the rear upper sliding block 2532 and meshes with the rear left toothed post 2521.

[0070] The rear upper moving drive assembly 2537 is slidably connected to the rear side of the rear connecting frame 252, and its power output end is connected to the rear end of the upper drive shaft 2536, for driving the upper drive shaft 2536 to rotate, thereby driving the front upper sliding block 2531 and the rear upper sliding block 2532 to move up and down together with the upper longitudinal connecting beam 2533, the upper cleaning belt assembly 2534 and the upper cleaning drive assembly 2535. The rear upper moving drive assembly 2537 is preferably a drive motor, or a combination structure of a drive motor and a gearbox, which can adjust the output speed according to actual needs.

[0071] The upper cleaning unit 253 described in this application adopts a toothed meshing transmission structure and a sliding connection to achieve precise synchronous operation, ensuring smooth up-and-down movement of the whole unit. The cleaning height can be adjusted according to actual needs to adapt to cleaning operations of different specifications of material belts, further enhancing the applicability and flexibility of the equipment, and has strong practicality and promotional value.

[0072] Furthermore, the upper cleaning belt assembly 2534 includes a front upper drive wheel 25341 connected to the power output end of the upper cleaning drive assembly 2535, a rear upper driven wheel 25342 located behind the front upper drive wheel 25341, and an upper cleaning belt body 25343 wound around the front upper drive wheel 25341 and the rear upper driven wheel 25342. The upper cleaning belt body 25343 can be a belt brush, a nylon brush belt, or a sponge cleaning belt, which can be replaced according to different cleaning needs to ensure maximum cleaning effect.

[0073] Furthermore, the upper cleaning assembly 253 also includes a front upper suction cover 2538, which is located on the front side of the upper cleaning belt assembly 2534 and is used to connect an external negative pressure suction device to absorb the debris and dust generated during the cleaning process of the upper cleaning belt assembly 2534.

[0074] Furthermore, the upper cleaning group 253 and the lower cleaning group 254 are arranged symmetrically. That is, their structures and working principles are the same, so they will not be described in detail again.

[0075] Furthermore, the rotating access mechanism 26 includes an access plate 261 and a rotating drive assembly 262;

[0076] The right side of the access plate 261 is rotatably connected to the upper left side of the base 21; the lower end of the rotation drive assembly 262 is located on the lower left side of the base 21, and its upper end is connected to the lower side of the access plate 261. The rotation drive assembly 262 is preferably a drive cylinder, the purpose of which is that drive cylinder technology is mature, low in cost, and has outstanding practicality.

[0077] Furthermore, the intermediate auxiliary conveying mechanism 27 includes connecting bearing seats arranged at intervals, and an intermediate rotating roller disposed between the two connecting bearing seats. This structural design is an existing design, mainly to meet the installation and use of the intermediate rotating roller, and therefore will not be described in detail.

[0078] Furthermore, the rolling mill leveling equipment also includes an auxiliary guide output mechanism 28 rotatably connected to the right side of the base 21. The auxiliary guide output mechanism 28 includes an output guide plate 281 and an auxiliary guide drive assembly 282. The left side of the output guide plate 281 is rotatably connected to the upper right side of the base 21. The lower end of the auxiliary guide drive assembly 282 is located on the lower right side of the base 21, and its upper end is connected to the output guide plate 281. The auxiliary guide drive assembly 282 is preferably a drive cylinder, the purpose of which is that drive cylinder technology is mature, low in cost, and has outstanding practicality.

[0079] Furthermore, the auxiliary guide output mechanism 28 also includes an extension guide plate 283 and an extension drive group 284; the extension guide plate 283 is slidably connected to the output guide plate 281; the extension drive group 284 is disposed on the output guide plate 281, located below the extension guide plate 283, and its right power output end is connected to the lower right side of the extension guide plate 283, for driving the extension guide plate 283 to extend and retract along the lateral direction of the output guide plate 281.

[0080] By adopting the above-mentioned structural design, this application can flexibly adapt to different material strip output guidance requirements, effectively improving the applicability and ease of operation of the leveling equipment.

[0081] The above description is one implementation method provided in conjunction with specific content, and does not imply that the specific implementation of this application is limited to these descriptions. Any methods or structures that are similar to or identical to those of this application, or any technical deductions or substitutions made based on the concept of this application, should be considered within the scope of protection of this application.

Claims

1. A rolling mill levelling device comprising a base (21) provided on the upper side with a connecting bracket (211), characterised in that, Also includes: The lower leveling roller group (22) is mounted on the connecting bracket (211) and located on the lower side of the connecting bracket (211); The upper leveling roller group (23) is located on the connecting bracket (211), above the lower leveling roller group (22), and forms a leveling gap with the lower leveling roller group (22). An adjustment mechanism (24) is located on the upper side of the connecting bracket (211), and its lower end is connected to the upper leveling roller group (23) for driving the upper leveling roller group (23) to move up and down to adjust the size of the leveling gap. A cleaning mechanism (25), located on the left side of the connecting bracket (211), is used to clean the material belt conveyed to the leveling gap; Rotary access mechanism (26) is rotatably connected to the left side of the base (21) for accessing the material belt that has been rotated and unfolded by the unwinding device, and guiding the material belt to be conveyed to the cleaning mechanism (25) and the leveling gap direction; An intermediate auxiliary conveying mechanism (27) is located on the lower left side of the connecting bracket (211) and on the right side of the cleaning mechanism (25). It is used to assist the material belt in being smoothly conveyed from the cleaning mechanism (25) to the leveling gap.

2. A mill leveller according to claim 1, characterised in that, The cleaning mechanism (25) includes: A front connecting bracket (251) is located on the left front side of the connecting bracket (211); The rear connecting bracket (252) is located on the left rear side of the connecting bracket (211); The upper cleaning unit (253) is located between the front connecting frame (251) and the rear connecting frame (252) and is used to rotate the upper surface of the cleaning material belt; The lower cleaning unit (254) is located below the upper cleaning unit (253) and is used to rotate the lower surface of the cleaning material belt.

3. A mill leveller according to claim 2, characterised in that, The front connecting frame (251) is provided with a front left toothed post (2511) located on the left side and a front right guide post (2512) located on the right side of the front left toothed post (2511); The rear connecting frame (252) is provided with a rear left toothed post (2521) located on the left side and a rear right guide post (2522) located on the right side of the rear left toothed post (2521). The upper cleaning group (253) includes: The front upper sliding block (2531) is slidably connected to the front left toothed post (2511) and the front right guide post (2512); The upper rear sliding block (2532) is slidably connected to the left rear toothed post (2521) and the right rear guide post (2522); An upper longitudinal connecting beam (2533) is disposed between the front upper sliding block (2531) and the rear upper sliding block (2532); The upper cleaning belt assembly (2534) is located on the left side of the upper longitudinal connecting beam (2533); The upper cleaning drive assembly (2535) is located on the right side in front of the upper longitudinal connecting beam (2533) and is connected to the upper cleaning belt assembly (2534) for driving the upper cleaning belt assembly (2534) to rotate. An upper drive shaft (2536) is disposed between the front upper sliding block (2531) and the rear upper sliding block (2532), with its front end extending into the front upper sliding block (2531) and engaging with the front left toothed post (2511), and its rear end extending into the rear upper sliding block (2532) and engaging with the rear left toothed post (2521). The rear upper moving drive assembly (2537) is slidably connected to the rear side of the rear connecting frame (252), and its power output end is connected to the rear end of the upper drive shaft (2536) to drive the upper drive shaft (2536) to rotate, thereby driving the front upper sliding block (2531) and the rear upper sliding block (2532) to move up and down together with the upper longitudinal connecting beam (2533), the upper cleaning belt assembly (2534) and the upper cleaning drive assembly (2535).

4. A mill leveller according to claim 3, characterised in that, The upper cleaning belt assembly (2534) includes a front upper drive wheel (25341) connected to the power output end of the upper cleaning drive assembly (2535), a rear upper driven wheel (25342) located behind the front upper drive wheel (25341), and an upper cleaning belt body (25343) wound around the front upper drive wheel (25341) and the rear upper driven wheel (25342).

5. A mill leveller according to claim 4, characterised in that, The upper cleaning group (253) also includes: The front upper suction cover (2538) is located on the front side of the upper cleaning belt assembly (2534) and is used to connect an external negative pressure suction device to absorb the debris and dust generated during the cleaning process of the upper cleaning belt assembly (2534).

6. A mill leveller according to claim 5, characterised in that, The upper cleaning group (253) and the lower cleaning group (254) are arranged symmetrically.

7. The mill leveller apparatus according to claim 1, characterised in that, The rotating access mechanism (26) includes: The access plate (261) is rotatably connected to the upper left side of the base (21) on its right side; The rotation drive assembly (262) has its lower end located on the lower left side of the base (21), and its upper end connected to the lower side of the access plate (261).

8. The mill leveller apparatus according to claim 1, characterised in that, The intermediate auxiliary conveying mechanism (27) includes connecting bearing seats arranged at intervals, and an intermediate rotating roller disposed between the two connecting bearing seats.

9. The mill leveller apparatus according to claim 1, characterised in that, The mill leveling equipment further includes an auxiliary guide output mechanism (28) rotatably connected to the right side of the base (21), the auxiliary guide output mechanism (28) comprising: The output guide plate (281) is rotatably connected to the upper right side of the base (21) on its left side; The auxiliary guide drive group (282) is located at the lower right side of the base (21) and its upper end is connected to the output guide plate (281).

10. The mill leveling equipment according to claim 9, characterized in that, The auxiliary guidance output mechanism (28) also includes: An extension guide plate (283) is slidably connected to the output guide plate (281); An extension drive assembly (284) is disposed on the output guide plate (281), located below the extension guide plate (283), and its right power output end is connected to the lower right side of the extension guide plate (283), for driving the extension guide plate (283) to extend and retract along the lateral direction of the output guide plate (281).

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