A fixing assembly for cutting a multi-leaf hollow orifice spinneret
Patent Information
- Application Number
- CN202521765685.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-19
- Publication Date
- 2026-09-25
- Estimated Expiration
- 2035-08-19
AI Technical Summary
[0004]本实用新型的目的在于克服现有技术的不足，适应现实需要，提供一种多叶中空形孔喷丝板切割用固定组件，以解决当前在使用激光切割机而对喷丝板进行异形孔切割加工时，需要操作者将喷丝板工件放置于切割台表面后，为了避免工件在切割过程中任意的移动，则会使用相应可调节的固定机构而从工件两侧对其进行抵动限位，而在对工件进行切割加工完成后，操作者则首先需要等待激光发射器位置复原后，再在激光切割机外部的防护框中，对固定机构进行手动调节而使其从工件外壁移开，随之再对工件进行拿取更换，而整体操作流程，不仅操作者需要受限于防护框内部空间面积较小的影响，导致对固定机构调节的不便，而且整体操作步骤较为繁琐，针对相同规格型号的工件，需要操作者多次重复的进行调节操作，进而影响对数量较多喷丝板工件的开孔切割加工效率的技术问题
1.本实用新型通过在防护框内部设置有可竖向移动的升降板和可水平移动的承载板，并且在导向框内部滑动安装有传动板，结合转轴而将倾斜的推动杆两端分别和传动板以及升降板相连接，使得在升降板竖向移动时，推动杆的两端分别在第一滑动板以及升降板底面发生相对转动后，推动杆可以将升降板的竖向移动力，转换为对第一滑动板以及传动板的水平推拉力，进而可以带动承载板可以随着升降板的上升或者下移时，同步在防护框内部后向或者前向移动，与此同时，在承载板水平移动的同时，结合随动齿轮和传动齿条的啮合传动作用下，使得随动齿轮可以带动连接杆以及与之相连接的转动丝杆同步进行转动，随之结合转动丝杆对活动套筒的转动传动作用下，可以使得活动套筒随之同步在固定框内部进行水平移动，随之可以提供给限位挡板水平驱动力，使得升降板在上升复位过程中，承载板随之前向移出防护框内部时，限位挡板可以同步相向的在承载板表面进行平移，使得限位挡板失去对工件的夹持固定力度，方便快速对切割完成的工件进行拿取更换，反之，在升降板下移切割加工时，承载板随之后向移入防护框内部时，限位挡板可以同步相对的在承载板表面进行平移，限位挡板进行调节而对喷丝板工件进行夹持固定，提高整体结构功能之间的联动性，进而减少操作者对喷丝板工件固定以及拆装所需的操作步骤，提高对喷丝板激光切割加工效率。
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Figure CN224794863U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of spinneret cutting technology, specifically a fixing component for cutting multi-leaf hollow-hole spinnerets. Background Technology
[0002] Multi-leaf hollow spinnerets are key components in the field of chemical fiber spinning. Their unique orifice design combines multi-leaf structure with hollow characteristics. The orifices are distributed in a radial blade pattern, usually with 3-8 blades. The blade tips are rounded and the center retains a hollow cavity. In order to cut and process the entire spinneret into a multi-leaf hollow shape, a corresponding laser cutting machine is often used for cutting.
[0003] When using a laser cutting machine to cut irregular holes in spinnerets, the operator needs to place the workpiece on the cutting table. To prevent the workpiece from moving arbitrarily during cutting, an adjustable fixing mechanism is used to restrain and limit its movement from both sides. After cutting, the operator must first wait for the laser emitter to return to its original position before manually adjusting the fixing mechanism within the protective frame outside the laser cutting machine to remove it from the workpiece's outer wall. The workpiece can then be removed and replaced. This entire process is not only limited by the small internal space of the protective frame, making adjustment of the fixing mechanism inconvenient, but also cumbersome. For workpieces of the same specifications, the operator needs to repeat the adjustment operation multiple times, thus affecting the efficiency of cutting a large number of spinneret workpieces. Therefore, a new technical solution is needed to address this issue. Utility Model Content
[0004] The purpose of this utility model is to overcome the shortcomings of the existing technology, adapt to practical needs, and provide a fixing component for cutting multi-leaf hollow spinnerets. This addresses the current technical problem of using a laser cutting machine to cut irregular holes in spinnerets. When the operator places the spinneret workpiece on the cutting table surface, an adjustable fixing mechanism is used to restrain and limit its movement from both sides to prevent arbitrary movement during the cutting process. After cutting, the operator must wait for the laser emitter to return to its original position before manually adjusting the fixing mechanism within the protective frame outside the laser cutting machine to remove it from the workpiece's outer wall. The workpiece is then removed and replaced. This entire operation is not only limited by the small internal space of the protective frame, making adjustment inconvenient, but also cumbersome. For workpieces of the same specifications, the operator needs to repeat the adjustment operation multiple times, thus affecting the efficiency of cutting a large number of spinneret workpieces.
[0005] To achieve the purpose of this utility model, the technical solution adopted by this utility model is as follows: a fixing component for cutting a multi-leaf hollow spinneret is designed, including a protective frame, a lifting plate is slidably installed on the top inner side of the protective frame, an electric push rod is vertically installed at the middle of the outer side of the top of the protective frame, and the bottom of the drive shaft of the electric push rod is connected to the top of the lifting plate, and a laser emitter is movably arranged at the bottom of the lifting plate; A support plate is slidably installed on the bottom inner side of the protective frame, and a conversion mechanism is provided between the bottom of the lifting plate and the outer side of the support plate; A synchronization mechanism is provided on the outer side of the bottom of the support plate. Fixed frames are fixedly installed on both sides of the bottom of the support plate. A translation mechanism is provided inside the fixed frame, and the translation mechanism and the synchronization mechanism are connected in a transmission manner. Limiting baffles are slidably installed on both sides of the top of the support plate, and the translation mechanism and the limiting baffles are connected in a transmission manner.
[0006] Preferably, the conversion mechanism includes a transmission rod, guide frames are fixedly installed on both sides of the bottom inner side of the protective frame, a transmission plate is slidably installed inside each guide frame, a first sliding plate is slidably installed on the outer side of each guide frame, and the side of the first sliding plate is fixedly connected to the outer wall of the bearing plate, a second sliding plate is slidably installed on the top outer surface of each guide frame, connecting blocks are fixedly installed horizontally and vertically on the top and side of each transmission plate, and the two sets of connecting blocks are fixedly connected to the first sliding plate and the second sliding plate respectively, a transmission rod is inclinedly hinged to the top of each second sliding plate through a rotating shaft, a fixing plate is fixedly installed on both sides of the bottom of the lifting plate, and the top of the transmission rod is hinged to the bottom side of the fixing plate through a rotating shaft, guide grooves are opened on the top and side of the guide frame, and the connecting blocks are slidably inserted into the guide grooves.
[0007] Preferably, the translation mechanism includes a rotating lead screw, a guide frame is fixedly installed at the bottom center of the bearing plate, support plates are vertically fixedly installed on the four corner surfaces of the outer wall of the guide frame, and the top of the support plate is fixedly connected to the bottom surface of the bearing plate. A rotating lead screw is installed laterally inside each guide frame through a bearing, and a movable sleeve is threadedly connected to the outside of each rotating lead screw.
[0008] Preferably, a first transmission frame is fixedly installed on the top surface of the outer side of each movable sleeve, and a second transmission frame is fixedly installed on the top surface of each first transmission frame. The top of the second transmission frame and the bottom surface of the limiting baffle are fixedly connected. A limiting groove is opened in the middle of the bearing plate and the top of the fixed frame. The first transmission frame and the second transmission frame are slidably inserted into the limiting groove.
[0009] Preferably, the synchronization mechanism includes a follower gear and a transmission rack. The bottom center of the protective frame has an installation groove, and the transmission rack is detachably installed inside the installation groove. A connecting rod is rotatably installed between the two sets of fixed frame sides via bearings, and both ends of the connecting rod side are fixedly connected to the top of the rotating screw side. The follower gear is fixedly sleeved at the middle of the connecting rod, and the bottom of the follower gear meshes with the top of the transmission rack.
[0010] Preferably, a fixing baffle is fixedly installed on the top surface of the side of the transmission rack, and the side wall of the fixing baffle is movably attached to the bottom outer wall of the protective frame. Fixing bolts are slidably inserted through both ends of the side of the fixing baffle, and the sides of the fixing bolts are screwed into the inside of the protective frame by threads.
[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This utility model features a vertically movable lifting plate and a horizontally movable bearing plate inside a protective frame, with a transmission plate slidably installed inside a guide frame. An inclined push rod is connected at both ends to the transmission plate and the lifting plate via a rotating shaft. When the lifting plate moves vertically, the two ends of the push rod rotate relative to the bottom surfaces of the first sliding plate and the lifting plate, converting the vertical movement force of the lifting plate into a horizontal pushing and pulling force on the first sliding plate and the transmission plate. This allows the bearing plate to move synchronously backward or forward within the protective frame as the lifting plate rises or falls. Simultaneously, as the bearing plate moves horizontally, the meshing of a follower gear and a transmission rack causes the follower gear to drive the connecting rod and its connected rotating lead screw to rotate synchronously. The rotational transmission of the movable sleeve by the lead screw allows the movable sleeve to move horizontally within the fixed frame in sync. This provides a horizontal driving force to the limiting baffle, enabling the limiting baffle to move synchronously on the surface of the carrying plate as the lifting plate moves forward out of the protective frame during the upward resetting process. This causes the limiting baffle to lose its clamping force on the workpiece, facilitating quick removal and replacement of the cut workpiece. Conversely, when the lifting plate moves downward for cutting, the carrying plate moves backward into the protective frame, and the limiting baffle moves synchronously on the surface of the carrying plate. The limiting baffle adjusts to clamp and fix the spinneret workpiece, improving the linkage between the functions of the overall structure. This reduces the number of steps required for the operator to fix and disassemble the spinneret workpiece, thus improving the efficiency of laser cutting of the spinneret.
[0012] 2. This utility model, by providing a fixed baffle on the side of the transmission rack, inserting the fixed baffle into the mounting groove, and screwing the fixing bolt through the fixed baffle to the inner wall of the protective frame, allows for quick disassembly and replacement of the transmission rack located inside the mounting groove. This also allows for adaptable replacement of the transmission rack length, and allows for adaptable adjustment of the moving distance of the limiting baffle according to the size of the spinneret workpiece to be cut. Consequently, the limiting baffle can fully conform to the outer wall of spinneret workpieces of different sizes, providing a stable clamping force and ensuring the cutting quality of the spinneret workpiece. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the guide frame of this utility model; Figure 3 This is a front view sectional view of the bearing plate and fixing frame of this utility model; Figure 4 This is a schematic diagram of the bottom structure of the protective frame of this utility model; In the diagram: 1. Protective frame; 11. Electric actuator; 12. Lifting plate; 13. Support plate; 14. Laser emitter; 2. Guide frame; 21. Transmission plate; 22. Connecting block; 23. First sliding plate; 24. Second sliding plate; 25. Fixing plate; 26. Transmission rod; 27. Guide groove; 3. Support plate; 31. Fixed frame; 32. Rotating lead screw; 33. Connecting rod; 34. Follower gear; 35. Mounting slot; 36. Transmission rack; 4. Movable sleeve; 41. First transmission frame; 42. Second transmission frame; 43. Limiting baffle; 44. Limiting groove; 5. Fix the baffle; 51. Fix the bolts. Detailed Implementation
[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments: Example 1: A fixing assembly for cutting multi-leaf hollow spinneret, see [link to example]. Figures 1 to 4 The bottom center of the protective frame 1 has an installation groove 35. A transmission rack 36 is detachably installed inside the installation groove 35. A fixing baffle 5 is fixedly installed on the top surface of the side of the transmission rack 36. The side wall of the fixing baffle 5 is movably attached to the bottom outer wall of the protective frame 1. Fixing bolts 51 are slidably inserted through both ends of the side of the fixing baffle 5. The side of the fixing bolts 51 is screwed into the inside of the protective frame 1 by threads.
[0015] When it is necessary to cut the surface of the spinneret workpiece, the spinneret workpiece is placed in the middle of the surface of the bearing plate 13 according to the size of the spinneret workpiece. The transmission rack 36 of the appropriate length is selected according to the distance between the outer wall of the spinneret and the limiting baffle 43. The transmission rack 36 is then pushed and inserted into the mounting groove 35. After the fixing baffle 5 on the side of the transmission rack 36 is attached to the outer wall of the protective frame 1, the fixing bolt 51 is inserted into both sides of the fixing baffle 5. The fixing bolt 51 is continuously tightened to stably install the transmission rack 36 in the mounting groove 35.
[0016] For details, see Figures 1 to 4 A lifting plate 12 is slidably installed on the top inner side of the protective frame 1. An electric push rod 11 is vertically installed at the middle of the outer top of the protective frame 1, and the bottom of the drive shaft of the electric push rod 11 is connected to the top of the lifting plate 12. A bearing plate 13 is slidably installed on the bottom inner side of the protective frame 1. Guide frames 2 are fixedly installed on both sides of the bottom inner side of the protective frame 1. A transmission plate 21 is slidably installed inside each guide frame 2. A first sliding plate 23 is slidably installed on the outer side of each guide frame 2, and the side of the first sliding plate 23 is fixedly connected to the outer wall of the bearing plate 13. A second sliding plate 24 is slidably installed on the top outer surface of each guide frame 2. Connecting blocks 22 are fixedly installed horizontally and vertically on the top and sides of the transmission plate 21, and the two sets of connecting blocks 22 are fixedly connected to the first sliding plate 23 and the second sliding plate 24, respectively. The top of each second sliding plate 24 is inclinedly hinged to a transmission rod 26 through a rotating shaft. The bottom end of the transmission rod 26 always forms an acute angle with the surface of the second sliding plate 24. Fixing plates 25 are fixedly installed on both sides of the bottom of the lifting plate 12, and the top end of the transmission rod 26 is hinged to the bottom side of the fixing plate 25 through a rotating shaft. Guide grooves 27 are opened on the top and sides of the guide frame 2, and the connecting blocks 22 are slidably inserted into the guide grooves 27.
[0017] After selecting a suitable transmission rack 36 and installing it inside the mounting slot 35, the electric push rod 11 is turned on via an external control switch, causing it to rotate and drive the lifting plate 12 to move synchronously downward inside the protective frame 1. During this process, the two ends of the push rod rotate relative to each other on the bottom surfaces of the first sliding plate 23 and the lifting plate 12, respectively. The push rod can convert the vertical movement force of the lifting plate 12 into a horizontal pulling force on the first sliding plate 23 and the transmission plate 21. Combined with the guiding sliding action of the guide groove 27 on the connecting block 22, the transmission plate 21 moves horizontally inside the guide frame 2 while simultaneously... The second sliding plate 24 moves horizontally on the outer wall of the guide frame 2, thereby providing a corresponding driving force to the bearing plate 13, so that the bearing plate 13 moves from the outside of the protective frame 1 toward its interior. After the cutting process is completed, when the lifting plate 12 is driven to be reset by the electric push rod 11 and is lifted synchronously inside the protective frame 1, the above transmission steps are repeated. The push rod can provide a corresponding horizontal thrust to the first sliding plate 23 and the transmission plate 21, which can drive the bearing plate 13 to move synchronously from the inside of the protective frame 1 outward, so as to facilitate the removal and replacement of the spinneret workpiece after its surface cutting process.
[0018] Further, see Figures 1 to 4 A connecting rod 33 is rotatably mounted between the two sets of fixed frames 31 via bearings, and both ends of the connecting rod 33 are fixedly connected to the top of the rotating screw 32. A follower gear 34 is fixedly sleeved at the middle end of the connecting rod 33, and the bottom of the follower gear 34 meshes with the top of the transmission rack 36.
[0019] A guide frame 2 is fixedly installed at the bottom center of the support plate 13. Support plates 3 are vertically fixedly installed on the four corner surfaces of the outer wall of the guide frame 2, and the top of the support plate 3 is fixedly connected to the bottom surface of the support plate 13. A rotating screw 32 is installed inside each guide frame 2 through a bearing for lateral rotation. The surfaces of the two sets of rotating screws 32 are provided with threads in opposite directions. A movable sleeve 4 is movably sleeved on the outside of each rotating screw 32 through a thread, and the inside of the movable sleeve 4 is provided with a thread that matches the reverse direction of the helix on the outer wall of the rotating screw 32. A guide frame 2 is fixedly installed at the bottom center of the bearing plate 13. Support plates 3 are vertically fixedly installed on the four corner surfaces of the outer wall of the guide frame 2. The top of the support plate 3 is fixedly connected to the bottom surface of the bearing plate 13. A rotating screw 32 is installed inside each guide frame 2 through a bearing for horizontal rotation. The surfaces of the two sets of rotating screws 32 are provided with threads in opposite directions. A movable sleeve 4 is movably sleeved on the outside of each rotating screw 32 through a thread. The movable sleeve 4 is provided with a thread inside that matches the reverse direction of the helix on the outer wall of the rotating screw 32.
[0020] Each movable sleeve 4 has a first transmission frame 41 fixedly installed on its outer top surface, and a second transmission frame 42 fixedly installed on the top surface of each first transmission frame 41. The top of the second transmission frame 42 is fixedly connected to the bottom surface of the limiting baffle 43. The middle part of the bearing plate 13 and the top of the fixed frame 31 are both provided with limiting grooves 44, and the first transmission frame 41 and the second transmission frame 42 are slidably inserted into the limiting grooves 44.
[0021] As the bearing plate 13 moves inward toward the interior of the protective frame 1, the follower gear 34 and the transmission rack 36 mesh. With the continuous translation of the bearing plate 13, the follower gear 34 drives the connecting rod 33 and the connected rotating screw 32 to rotate synchronously. Combined with the rotational transmission action of the rotating screw 32 on the movable sleeve 4, the movable sleeve 4 moves horizontally within the fixed frame 31, providing a horizontal driving force to the limiting baffle 43. This allows the limiting baffle 43 to move horizontally on the surface of the bearing plate 13 in a synchronous, opposite direction until the lifting plate 12 moves vertically to the set position, at which point the bearing plate 13 is completely... The spinneret is moved into the protective frame 1, and the side of the limiting baffle 43 fits tightly against the outer wall of the spinneret workpiece, clamping and fixing it. After the spinneret workpiece is cut and processed, the lifting plate 12 is driven by the electric push rod 11 to lift synchronously inside the protective frame 1. The above transmission steps are repeated. As the bearing plate 13 moves forward from inside the protective frame 1, the limiting baffle 43 can move horizontally on the surface of the bearing plate 13, thus losing its fixing effect on the spinneret workpiece. After the bearing plate 13 is completely removed from inside the protective frame 1, the limiting baffle 43 can return to its original position, facilitating the operator to pick up and replace the spinneret workpiece. It is worth noting that, see Figures 1 to 4 The bottom of the lifting plate 12 is equipped with a drive guide rail, which consists of three sets of electric guide rails that together form three different travel directions of the xyz axis. A laser emitter 14 is movably installed at the bottom of the lifting plate 12, and the laser emitter 14 is connected to the drive guide rail. Under the operation of the drive guide rail and the control of the external PLC controller, the laser emitter 14 can be moved in three directions, thereby realizing the laser cutting processing of the spinneret workpiece.
[0022] After the lifting plate 12 moves down to the set height, the bearing plate 13 moves completely into the protective frame 1. The side of the limiting baffle 43 is completely attached to the outer wall of the spinneret workpiece, fixing and clamping it. At the same time, the laser emitter 14 is positioned above the outer side of the spinneret workpiece. Combined with the operation of the drive guide rail, the laser emitter 14 can be driven to perform laser cutting on the surface of the spinneret, cutting the spinneret workpiece into a multi-leaf hollow hole shape.
[0023] In addition, all components designed in this utility model are general standard parts or components known to those skilled in the art. Their structure and principle can be learned by those skilled in the art through technical manuals or conventional experimental methods. Those skilled in the art can fully implement them, so there is no need to elaborate. The content protected by this utility model does not involve improvements to the internal structure and method.
[0024] The embodiments disclosed herein are preferred embodiments, but are not limited thereto. Those skilled in the art can readily grasp the spirit of this utility model based on the above embodiments and make different extensions and variations. However, as long as they do not depart from the spirit of this utility model, they are all within the protection scope of this utility model.
Claims
1. A fixing assembly for cutting a multi-leaf hollow-hole spinneret, comprising a protective frame (1), characterized in that, A lifting plate (12) is slidably installed on the top inner side of the protective frame (1). An electric push rod (11) is vertically installed at the middle of the outer side of the top of the protective frame (1). The bottom of the drive shaft of the electric push rod (11) is connected to the top of the lifting plate (12). A laser emitter (14) is movably installed at the bottom of the lifting plate. A bearing plate (13) is slidably installed on the bottom inner side of the protective frame (1), and a conversion mechanism is provided between the bottom of the lifting plate (12) and the outer side of the bearing plate (13); A synchronization mechanism is provided on the outer bottom of the bearing plate (13). A fixed frame (31) is fixedly installed on both sides of the bottom of the bearing plate (13). A translation mechanism is provided inside the fixed frame (31), and the translation mechanism and the synchronization mechanism are connected in transmission. Limiting baffles (43) are slidably installed on both sides of the top of the bearing plate (13), and the translation mechanism and the limiting baffles (43) are connected in transmission.
2. The fixing assembly for cutting multi-leaf hollow spinneret as described in claim 1, characterized in that, The conversion mechanism includes a transmission rod (26). Guide frames (2) are fixedly installed on both sides of the bottom inner side of the protective frame (1). A transmission plate (21) is slidably installed inside each guide frame (2). A first sliding plate (23) is slidably installed on the outer side of each guide frame (2), and the side of the first sliding plate (23) is fixedly connected to the outer wall of the bearing plate (13). A second sliding plate (24) is slidably installed on the top outer surface of each guide frame (2). The top and side of each transmission plate (21) are fixedly installed horizontally and vertically, respectively. There is a connecting block (22), and the two sets of connecting blocks (22) are fixedly connected to the first sliding plate (23) and the second sliding plate (24) respectively. The top of each second sliding plate (24) is inclinedly hinged with a transmission rod (26) through a rotating shaft. The bottom sides of the lifting plate (12) are fixedly installed with a fixing plate (25), and the top of the transmission rod (26) is hinged to the bottom side of the fixing plate (25) through a rotating shaft. The top and side of the guide frame (2) are provided with guide grooves (27), and the connecting block (22) is slidably inserted into the guide groove (27).
3. The fixing assembly for cutting multi-leaf hollow spinneret as described in claim 1, characterized in that, The translation mechanism includes a rotating screw (32), a guide frame (2) is fixedly installed at the bottom middle of the bearing plate (13), and a support plate (3) is fixedly installed vertically on the four corner surfaces of the outer wall of the guide frame (2). The top of the support plate (3) is fixedly connected to the bottom surface of the bearing plate (13). A rotating screw (32) is installed inside each guide frame (2) by rotating laterally through a bearing. A movable sleeve (4) is threadedly connected to the outside of each rotating screw (32).
4. The fixing assembly for cutting multi-leaf hollow-hole spinneret as described in claim 3, characterized in that, Each of the movable sleeves (4) has a first transmission frame (41) fixedly installed on its outer top surface, and a second transmission frame (42) fixedly installed on the top surface of each of the first transmission frames (41). The top of the second transmission frame (42) and the bottom surface of the limiting baffle (43) are fixedly connected. The middle part of the bearing plate (13) and the top of the fixed frame (31) are provided with limiting grooves (44), and the first transmission frame (41) and the second transmission frame (42) are slidably inserted into the limiting grooves (44).
5. The fixing assembly for cutting multi-leaf hollow-hole spinneret as described in claim 3, characterized in that, The synchronization mechanism includes a follower gear (34) and a transmission rack (36). The bottom middle of the protective frame (1) is provided with an installation groove (35). The transmission rack (36) is detachably installed inside the installation groove (35). A connecting rod (33) is rotatably installed between the two sets of fixed frames (31) through a bearing. Both ends of the connecting rod (33) are fixedly connected to the top of the side of the rotating screw (32). The follower gear (34) is fixedly sleeved at the middle of the connecting rod (33), and the bottom of the follower gear (34) meshes with the top of the transmission rack (36).
6. The fixing assembly for cutting multi-leaf hollow-hole spinneret as described in claim 5, characterized in that, A fixed baffle (5) is fixedly installed on the top surface of the side of the transmission rack (36), and the side wall of the fixed baffle (5) is movably attached to the bottom outer wall of the protective frame (1). Fixed bolts (51) are slidably inserted through both ends of the side of the fixed baffle (5), and the side of the fixed bolts (51) is screwed into the inside of the protective frame (1) by threads.