Mechanism carbon preheating shaping device

Abstract

The utility model provides a kind of mechanism carbon preheating setting device, including first support frame and second support frame, the first support frame and the second support frame are set left and right, the first support frame and second support frame upper surface are provided with fixed block, and the fixed block between left and right two ends is all provided with guide rod between front and back two ends, the guide rod is provided with sliding cylinder, the first support frame left end is provided with the preheating setting cover body of right side open, the sliding cylinder upper surface is provided with U-shaped support frame through connecting piece, the U-shaped support frame is provided with support frame through moving part, the support frame middle part is separated into two placement areas by partition plate, the placement area is all provided with erecting plate in front and back side, and multiple first threaded holes are equidistantly arranged on the erecting plate;The utility model can realize mechanism carbon preheating setting operation, improve production continuity and realize mould quick adjustment.

Description

Technical Field

[0001] This utility model relates to the technical field of machine-made charcoal production equipment, and in particular to a machine-made charcoal preheating and shaping device. Background Technology

[0002] As a representative product of modern environmentally friendly fuels, the preheating and shaping process of machine-made charcoal directly affects the quality and production efficiency of the final product. Traditional fixed preheating and shaping devices suffer from several technical bottlenecks: First, the operation requires frequent start-ups and shutdowns for loading and unloading, resulting in significant heat loss and poor production continuity; second, the mold system lacks adjustability, necessitating machine shutdown and mold replacement when producing different specifications; third, existing demolding mechanisms often employ simple ejection designs, easily causing surface damage to the formed charcoal blanks; furthermore, uneven distribution of the mold heating system leads to inconsistent heating of the charcoal blanks, affecting the uniformity of product density. These technical deficiencies collectively restrict the development of the machine-made charcoal industry towards automation and intelligence, increasing production costs and energy consumption for enterprises. Especially in high-temperature operating environments, the high degree of manual intervention in operation poses serious safety hazards. Currently, there is an urgent need to develop an integrated, adjustable, and continuous production preheating and shaping system to solve the technical problems of rigid structure, high energy consumption, and low efficiency of traditional equipment. Summary of the Invention

[0003] In view of this, the purpose of this utility model is to provide a preheating and shaping device for machine-made charcoal that can realize the preheating and shaping operation of machine-made charcoal, improve the continuity of production, and realize the rapid adjustment of molds.

[0004] This utility model is implemented using the following method: a preheating and shaping device for machine-made charcoal, comprising a first support frame and a second support frame, the first support frame and the second support frame being arranged left and right, a fixing block being provided on the upper surface of the first support frame and the second support frame, and guide rods being provided at both the front and rear ends between the fixing blocks at the left and right ends, with a sliding cylinder being provided on the guide rods, a preheating and shaping cover with an open right side being provided at the left end of the first support frame, a U-shaped support frame being provided on the upper surface of the sliding cylinder via a connecting member, a support frame being provided on the U-shaped support frame via a moving member, the middle of the support frame being divided into two placement areas by a partition plate, a mounting plate being provided on both the front and rear sides of the placement area, a plurality of first threaded holes being opened at equal intervals on the mounting plate, a plurality of lower molds for placing machine-made charcoal being mounted at equal intervals on the mounting plates at both the front and rear ends, and an upper mold for shaping and pressing machine-made charcoal being provided inside the preheating and shaping cover.

[0005] Furthermore, the connector includes a connecting block, which is provided on the sides of the two vertical plates of the U-shaped support frame, and the connecting block is connected to the sliding cylinder by a first bolt.

[0006] Furthermore, the moving component includes a dual-output motor, and the upper surface of the two vertical plates of the U-shaped support frame is provided with a strip-shaped groove. The dual-output motor is arranged in the middle of the crossbar of the U-shaped support frame. A steering device is provided at the end of the output shaft of the dual-output motor. The output end of the steering device is connected to a screw, and the screw is arranged in the strip-shaped groove. A moving block is spirally sleeved on the screw, and the moving block is connected to the support frame.

[0007] Furthermore, the lower mold includes a support block, the upper surface of which is provided with a placement groove for placing machine-made charcoal, the bottom surface of which is provided with a demolding component, and extension blocks extending outward from both the front and rear ends of the upper surface of the support block, the left and right ends of which are provided with second threaded holes corresponding to the first threaded hole, and heating wires are provided in the side of the placement groove.

[0008] Furthermore, the demolding component includes a first telescopic cylinder, which is embedded in the center of the bottom surface of the placement groove, and a transparent demolding template is provided at the end of the telescopic rod of the first telescopic cylinder.

[0009] Furthermore, the upper mold includes a second telescopic cylinder, and the top surface of the preheating and shaping cover is provided with the second telescopic cylinder. The end of the telescopic rod of the second telescopic cylinder is provided with a cover body corresponding to the support frame. Multiple lifting screws corresponding to the placement slots are spirally embedded at equal intervals on the cover body, and a pressing block is provided at the end of the lifting screw.

[0010] The beneficial effects of this utility model are as follows: This utility model achieves continuous loading and unloading by driving the U-shaped support frame to move along the guide rod through the sliding cylinder. The partition structure of the support frame and the adjustable mounting plate design can be adapted to molds of different specifications. Combined with the heating wire for uniform heating and the demolding mechanism, it solves the technical problems of poor production continuity, cumbersome mold replacement and demolding damage of traditional equipment. It has the advantages of improving production continuity, realizing rapid mold adjustment, reducing heat loss and improving demolding safety. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model.

[0012] Figure 2 This is a schematic diagram of the structure of the first support frame and the second support frame.

[0013] Figure 3 This is a schematic diagram of the lower mold structure. Detailed Implementation

[0014] The present invention will be further described below with reference to the accompanying drawings.

[0015] Please see Figures 1 to 3 As shown, this utility model provides an embodiment: a preheating and shaping device for machine-made charcoal, including a first support frame 1 and a second support frame 2, which are arranged left and right. The first support frame 1 and the second support frame 2 are provided with fixing blocks 3 on the upper surface of the first support frame 1 and the second support frame 2. Guide rods 4 are provided at both the front and rear ends between the fixing blocks 3 at the left and right ends. A sliding cylinder 5 is provided on the guide rod 4. A preheating and shaping cover 6 with an open right side is provided at the left end of the first support frame 1. A U-shaped support frame 51 is provided on the upper surface of the sliding cylinder 5 via a connecting piece 7. A support frame 52 is provided on the U-shaped support frame 51 via a moving piece 8. The middle part of the support frame 52 is divided into two placement areas 54 by a partition plate 53. A mounting plate 55 is provided on both the front and rear sides of the placement area 54. Multiple first threaded holes 56 are opened at equal intervals on the mounting plate 55. Multiple lower molds 9 for placing machine-made charcoal are mounted at equal intervals on the mounting plates 55 at the front and rear ends. An upper mold 10 for shaping and pressing machine-made charcoal is provided inside the preheating and shaping cover 6.

[0016] The first and second support frames refer to the steel structural frames that support the mold's moving track, which can be made of welded I-beams, providing basic support for the device. The guide rods are horizontally installed cylindrical guide rails between the support frames, which can be made of chrome-plated metal rods, used to guide the linear movement of the sliding cylinders. The sliding cylinders are the power components that drive the mold's supporting structure, which can be made of dual-axis pneumatic cylinders, achieving precise displacement through pneumatic control. The U-shaped support frame is an open-top frame structure, which can be formed by bending steel plates, used to connect the sliding cylinders to the support frames. The support frame is a rectangular frame that supports the mold, which can be assembled from aluminum alloy profiles, with partition plates dividing it into two independent working areas. The mounting plate is an installation plate with equidistant threaded holes, which can be machined from stainless steel plates and bolted to fix lower molds of different specifications. The lower mold is a forming module with a placement groove, which can be made of high-temperature resistant ceramic material, with heating wires installed in the placement groove for preheating. The upper mold refers to the pressing mechanism installed inside the preheating hood. Specifically, it can be a hydraulically driven pressing block assembly that works in conjunction with the lower mold to complete the shaping process.

[0017] Specifically, during operation, the operator places the machine-made charcoal blank into the lower mold in the right-side placement area of ​​the support frame. A sliding cylinder moves to the left along the guide rod, causing the support frame to enter the preheating and shaping hood. Inside the hood, the upper mold moves downwards, pressurizing and heating the charcoal blank. After shaping, the sliding cylinder returns to its right position, and the operator removes the finished charcoal strip from the right side while a new charcoal blank is loaded into the left-side placement area. The two placement areas of the support frame alternately enter the working position, enabling continuous production. Multiple first threaded holes on the mounting plate allow adjustment of the lower mold's installation spacing to accommodate charcoal blanks of different lengths. The heating wire inside the lower mold continuously preheats during movement, reducing temperature fluctuations.

[0018] Compared to existing technologies, which require machine downtime for loading and unloading of fixed molds, this solution enables continuous operation through a movable support frame, effectively reducing production downtime. Existing mold spacing is not adjustable, while this solution allows for quick adjustment via threaded holes in the mounting plate, eliminating the need to replace the entire mold set. Existing preheating covers frequently open, leading to heat loss; this solution uses a side-opening directional cover that automatically closes the working area when the mold is moved in, reducing heat loss.

[0019] Through the above technical solutions, this application achieves continuous production of the preheating and shaping process for machine-made charcoal, reducing the frequency of manual intervention. The adjustable mold spacing improves equipment adaptability and shortens product changeover time. The directional closed preheating structure effectively maintains stable operating temperature and improves energy efficiency. The dual-station alternating operation mode allows loading / unloading operations and the pressing process to be carried out in parallel, significantly increasing the output per unit time.

[0020] Please continue reading. Figure 1 and Figure 2 As shown, in one embodiment of the present invention, the connector 7 includes a connecting block 71. The connecting block 71 is provided on the two vertical plates of the U-shaped support frame 51. The connecting block 71 is connected to the sliding cylinder 5 by a first bolt 72.

[0021] The connecting block refers to a metal component with a planar contact surface, which can be made from a rectangular steel plate with a thickness ranging from 8 to 12 millimeters. The surface can be textured with anti-slip patterns to increase the coefficient of friction. This component is positioned and installed with the sliding cylinder via bolt holes, maintaining horizontal stability while bearing the weight of the U-shaped support frame.

[0022] The first bolt refers to a fastener with a hexagonal head, specifically an 8.8 grade high-strength carbon steel bolt with an M12×1.75 thread. Its length is adapted to the combined thickness of the connecting block and the sliding cylinder. An elastic washer can be used at the end of the bolt to prevent loosening, achieving a detachable rigid connection.

[0023] Specifically, connecting blocks are welded or bolted to the outer surfaces of the vertical plates on both sides of the U-shaped support frame, ensuring that the working plane of the connecting blocks is parallel to the top surface of the sliding cylinder. After applying an anti-seize agent to the threaded portion of the first bolt, the connecting block is tightened into the threaded hole at the top of the sliding cylinder. When the horizontal angle of the U-shaped support frame needs adjustment, the first bolt can be loosened for fine-tuning and then retightened. This structure ensures load-bearing strength while allowing operators to quickly complete maintenance and adjustments during equipment operation breaks.

[0024] Compared to existing technologies, traditional devices often use welding to fix the support structure and drive components, which requires cutting and re-welding the welds during equipment maintenance. This solution, however, uses bolted connections to create a separable modular structure between the U-shaped support frame and the sliding cylinder. When replacing damaged parts or adjusting equipment parameters, only the bolts need to be removed to separate the relevant components, significantly reducing downtime for equipment maintenance.

[0025] Through the above technical solution, this application realizes the rapid assembly and disassembly of the support structure and drive components, effectively solving the maintenance difficulties caused by traditional welding structures, reducing the operation time for mold position adjustment and equipment maintenance by about 60%, and avoiding the impact of welding deformation on equipment accuracy.

[0026] Please continue reading. Figure 1 and Figure 2 As shown, in one embodiment of this utility model, the movable component 8 includes a dual-output motor (not shown), and the upper surface of the two vertical plates of the U-shaped support frame 51 is provided with a strip groove 81. The dual-output motor is arranged in the middle of the crossbar of the U-shaped support frame 51. A steering device (not shown) is provided at the end of the output shaft of the dual-output motor. The output end of the steering device is connected to a screw 82, and the screw 82 is arranged in the strip groove 81. A movable block (not shown) is spirally sleeved on the screw 82, and the movable block is connected to the support frame 52.

[0027] Among them, the dual-output motor refers to a drive device with bidirectional synchronous power output. Specifically, it can be implemented by using a servo motor with a dual-axis extension structure, achieving synchronous transmission through symmetrical power output from both sides.

[0028] Among them, the strip groove refers to the guide structure that extends longitudinally along the vertical plate of the U-shaped support frame. Specifically, it can be realized by using a straight channel formed by machining, which provides installation space and motion trajectory constraints for the screw.

[0029] Among them, the steering gear refers to the mechanical device that changes the direction of power transmission. Specifically, it can be implemented by bevel gear set or worm gear mechanism, which converts the horizontal rotation of the motor into power output perpendicular to the direction of movement of the support frame.

[0030] Among them, the screw refers to a transmission rod with a helical pattern, which can be implemented by using a trapezoidal thread or a ball screw. It converts rotational motion into linear displacement through threaded engagement with the moving block.

[0031] The moving block refers to the sliding component that forms a helical pair with the screw. Specifically, it can be implemented using a metal slider with internal threads, which generates axial displacement along the strip groove when the screw rotates.

[0032] Specifically, when the position of the support frame needs to be adjusted, the dual-output motor synchronously drives the steering gear through the output shafts on both sides. The steering gear transmits power to the screws on both sides, causing them to rotate synchronously. At this time, the moving block moves linearly along the strip groove under the helical transmission of the screws, thereby driving the entire support frame to translate. This movement process can achieve different displacements by controlling the direction and speed of the motor, allowing the mold on the support frame to be adjusted to the predetermined position according to the specifications of the machine-made charcoal.

[0033] Compared to existing technologies, traditional fixed mold racks require manual disassembly and replacement of molds, while this solution achieves automatic mold position adjustment through a motor-driven screw mechanism. Existing technologies often require mold adjustments taking tens of minutes, while this solution can complete position switching within seconds of motor startup, without interrupting the production line for mold replacement operations.

[0034] Through the above technical solution, this application realizes the automated position adjustment of the mold support structure, solving the problems of low efficiency and poor mold adaptability of manual operation. By precisely controlling the movement through the electronic control system, it can quickly adapt to the shaping requirements of charcoal of different lengths, avoiding the downtime and adjustment losses caused by the fixed molds of traditional equipment, and significantly improving the flexibility of the production line.

[0035] Please continue reading. Figure 2 and Figure 3 As shown, in one embodiment of the present invention, the lower mold 9 includes a support block 91. The upper surface of the support block 91 is provided with a placement groove 92 for placing machine-made charcoal. A demolding component 93 is provided on the bottom surface of the placement groove 92. Extension blocks 94 extend outward from both the front and rear ends of the upper surface of the support block 91. The left and right ends of the extension blocks 94 are provided with second threaded holes 95 corresponding to the first threaded hole 56. Heating wires (not shown) are provided inside the side of the placement groove 92.

[0036] Among them, the support block refers to the rigid matrix structure that supports the carbon substrate. It can be made of cast iron or high-temperature resistant alloy materials and is used to provide a stable installation base for the placement tank and demolding parts.

[0037] The placement groove refers to a recessed structure that matches the shape of the machine-made charcoal. Specifically, it can be designed as a rectangular or cylindrical groove to accurately position the machine-made charcoal and limit its displacement during the preheating process.

[0038] Among them, the demolding component refers to the mechanism that separates the machine-made charcoal from the mold. Specifically, it can adopt a structure that drives the top plate with a cylinder, and pushes the shaped machine-made charcoal out of the placement groove through the ejection action.

[0039] The extension block refers to a plate-like structure that extends outward from the main body of the support block. Specifically, it can be fixed to the support block by welding or bolting to provide a connection interface with the erected plate.

[0040] The second threaded hole refers to a through hole opened on the extension block. It can be made of standard thread specifications and can be detachably fixed on the mounting plate by bolts engaging with the first threaded hole on the mounting plate.

[0041] The heating wire refers to the resistance heating element embedded in the side wall of the placement slot. Specifically, it can be made of nickel-chromium alloy material, which heats the machine-made charcoal evenly by passing electricity through it.

[0042] Specifically, the support block serves as the main structure of the lower mold. Its surface has a groove for accommodating the machine-made charcoal blank, and a demolding component installed at the bottom of the groove ejects the blank after shaping. Extension blocks at both ends of the support block extend outwards to form an installation platform. The second threaded hole on the extension block connects to the first threaded hole on the mounting plate via bolts, enabling quick assembly and disassembly of the lower mold on the mounting plate. Heating wires embedded in the sidewalls of the groove directly heat the charcoal blank, reducing heat loss. When mold specifications need adjustment, only the bolts need to be removed to replace the support block with a different size, without needing to replace the entire mounting plate.

[0043] Compared to existing technologies, the extension structure of traditional fixed molds is not adjustable, requiring machine shutdown and disassembly of the entire support plate when changing molds. This solution, however, achieves modular and rapid mold replacement through a threaded connection design between the extension block and the support plate. Furthermore, existing molds typically rely on external heating devices for indirect heat transfer, while this solution embeds the heating wire directly into the sidewall of the placement slot, shortening the heat conduction path and improving preheating efficiency.

[0044] Through the above technical solutions, this application solves the problems of poor adaptability of fixed molds and long machine adjustment time. By using detachable support blocks and standardized threaded holes, it can quickly adapt to the production needs of different specifications of machine-made charcoal. At the same time, the built-in heating wire acts directly on the charcoal blank, reducing heat loss and improving preheating uniformity. The integrated design of the demolding component further reduces the need for manual intervention and improves the degree of automation.

[0045] Please continue reading. Figure 3As shown, in one embodiment of the present invention, the demolding component 93 includes a first telescopic cylinder 96, the first telescopic cylinder 96 is embedded in the middle of the bottom surface of the placement groove 92, and a transparent demolding template 97 is provided at the end of the telescopic rod of the first telescopic cylinder 96.

[0046] The first telescopic cylinder is a linear actuator driven by hydraulic or pneumatic pressure, specifically a single-acting or double-acting cylinder. Its telescopic rod is rigidly connected to the transparent demolding template to achieve vertical lifting and lowering motion. The transparent demolding template is a plate-like structure made of high-temperature resistant transparent material, specifically tempered glass or polycarbonate composite material. Its transparency allows operators to observe the demolding process in real time.

[0047] Specifically, after the machine-made charcoal has been preheated and shaped in the placement tank, the first telescopic cylinder is activated, pushing the transparent demolding template upwards vertically. Once the template contacts the bottom of the charcoal blank, it continues to rise, gradually separating the blank from the inner wall of the placement tank. During this process, the operator can observe the demolding status of the charcoal blank in real time through the transparent template and adjust the lifting speed or pause the operation as needed. After demolding is complete, the first telescopic cylinder drives the transparent template back to its initial position, preparing for the next round of production.

[0048] Compared to existing technologies, traditional demolding devices often employ manual prying or fixed ejector rod structures, which suffer from uneven demolding force leading to carbon blank breakage and the inability of operators to observe the demolding process in real time. This solution combines a telescopic cylinder with precisely controllable stroke with a transparent demolding plate, achieving uniform application of demolding force and visualized monitoring of the process.

[0049] Through the above technical solution, this application effectively solves the problems of easy breakage and large blind spots in the demolding process of carbon blanks. The automated lifting and visual operation reduce the intensity of manual intervention, while avoiding product loss caused by uneven demolding force, and significantly improving the stability and controllability of the demolding process.

[0050] Please continue reading. Figure 1 and Figure 2 As shown, in one embodiment of the present invention, the upper mold 10 includes a second telescopic cylinder 101. The second telescopic cylinder 101 is provided on the inner top surface of the preheating and shaping cover 6. The telescopic rod end of the second telescopic cylinder 101 is provided with a cover 102 corresponding to the support frame 52. A plurality of lifting screws 103 corresponding to the placement groove 92 are spirally embedded at equal intervals on the cover 102. The end of the lifting screw 103 is provided with a pressing block 104.

[0051] The second telescopic cylinder is the power component that drives the lifting and lowering of the cover. It can be implemented using a hydraulic cylinder or an electric push rod. By controlling the stroke of the telescopic rod, the cover can cover or detach from the support frame. The lifting screw is an adjustable helical rod. Rotating the screw changes the vertical position of the pressing block, thus accommodating machine-made carbon blanks of different thicknesses. The pressing block is the forming component that mates with the placement groove of the lower mold. It can be made of high-temperature resistant alloy material. Adjusting the lifting screw ensures that the pressing block and the placement groove form a precise closed space.

[0052] Specifically, when the support frame, carrying the lower mold, moves to the area below the preheating and shaping cover, the second telescopic cylinder pushes the cover down until it is completely in contact with the support frame. Multiple lifting screws inside the cover can rotate independently, allowing the height of each pressing block to be adjusted according to the distribution of the lower mold placement slots. After the pressing block contacts the charcoal blank, continuous pressure combined with the heating wire melts the lignin and achieves shaping. After shaping is complete, the lifting screws can rotate in the opposite direction to reset the pressing block, preventing interference with the demolded charcoal blank.

[0053] Compared with existing technologies, traditional fixed pressure heads cannot adapt to lower molds of different specifications, and single-point pressure application easily leads to uneven stress on the carbon blank. This solution achieves multi-point independent pressure adjustment through a spirally embedded lifting screw, so that the pressing block and the placement groove form a dynamic match, which can not only ensure the forming accuracy of carbon blanks of different specifications, but also avoid carbon blank cracking caused by pressure concentration.

[0054] Through the above technical solution, this application solves the problem that fixed molds cannot adapt to products of multiple specifications, realizes dynamic distribution of pressing pressure, improves the stability and yield of carbon billet shaping process, and reduces downtime caused by mold replacement.

[0055] The telescopic cylinder, sliding cylinder, and dual-output motor in this utility model are all existing technologies, which are already clearly understood by those skilled in the art, and will not be described in detail here.

[0056] The above description is only a preferred embodiment of the present utility model. All equivalent changes and modifications made within the scope of the patent application of the present utility model shall be covered by the present utility model.

Claims

1. A preheating and shaping device for machine-made charcoal, characterized in that: The device includes a first support frame and a second support frame, which are arranged left and right. Fixed blocks are provided on the upper surfaces of the first and second support frames. Guide rods are provided at both the front and rear ends between the fixed blocks at the left and right ends. A sliding cylinder is provided on each guide rod. A preheating and shaping hood with its right side open is provided at the left end of the first support frame. A U-shaped support frame is provided on the upper surface of the sliding cylinder via a connecting piece. A support frame is provided on the U-shaped support frame via a moving piece. The middle of the support frame is divided into two placement areas by a partition plate. Support plates are provided on both the front and rear sides of each placement area. Multiple first threaded holes are evenly spaced on each support plate. Multiple lower molds for placing machine-made charcoal are evenly spaced on the support plates at both the front and rear ends. An upper mold for shaping and pressing the machine-made charcoal is provided inside the preheating and shaping hood.

2. The preheating and shaping device for machine-made charcoal according to claim 1, characterized in that: The connector includes a connecting block, which is provided on the sides of the two vertical plates of the U-shaped support frame. The connecting block is connected to the sliding cylinder by a first bolt.

3. The preheating and shaping device for machine-made charcoal according to claim 1, characterized in that: The moving component includes a dual-output motor. The upper surface of the two vertical plates of the U-shaped support frame is provided with a strip groove. The dual-output motor is arranged in the middle of the crossbar of the U-shaped support frame. A steering device is provided at the end of the output shaft of the dual-output motor. The output end of the steering device is connected to a screw, and the screw is arranged in the strip groove. A moving block is spirally sleeved on the screw, and the moving block is connected to the support frame.

4. The preheating and shaping device for machine-made charcoal according to claim 1, characterized in that: The lower mold includes a support block, and the upper surface of the support block is provided with a placement groove for placing machine-made charcoal. A demolding component is provided on the bottom surface of the placement groove. Extension blocks extend outward from both the front and rear ends of the upper surface of the support block. Second threaded holes corresponding to the first threaded holes are provided on both the left and right ends of the extension blocks. Heating wires are provided in the side of the placement groove.

5. The preheating and shaping device for machine-made charcoal according to claim 4, characterized in that: The demolding component includes a first telescopic cylinder, which is embedded in the center of the bottom surface of the placement groove, and a transparent demolding template is provided at the end of the telescopic rod of the first telescopic cylinder.

6. The preheating and shaping device for machine-made charcoal according to claim 4, characterized in that: The upper mold includes a second telescopic cylinder. The top surface of the preheating and shaping cover is provided with the second telescopic cylinder. The end of the telescopic rod of the second telescopic cylinder is provided with a cover body corresponding to the support frame. Multiple lifting screws corresponding to the placement slots are spirally embedded at equal intervals on the cover body. The end of the lifting screws is provided with a pressing block.

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