Mobile nitrogen injection nitrogen generator for petroleum

Abstract

The utility model discloses a mobile petroleum nitrogen injection nitrogen making machine relates to oil exploitation technical field, the utility model discloses a base, nitrogen making machine main part and air compressor, the top fixedly connected with the air extraction pipe of base, the inside of air extraction pipe is provided with a plurality of plug -in sealing components, the inside of plug -in sealing components is provided with filter layer, and the outer surface of air extraction pipe is provided with elastic fixed component corresponding plug -in sealing components. The utility model discloses through to elastic fixed component and pull, can remove the fixed plug -in sealing components, then directly with plug -in sealing components from the inside of air extraction pipe and extract, then take out filter layer from the inside of plug -in sealing components, in the above setting, directly to elastic fixed component and pull, can make plug -in sealing components drive filter layer and move from the inside of air extraction pipe, thereby make when filter layer is dismantled from the inside of air extraction pipe, and it is washed or replaced, and the operation is convenient.

Description

Technical Field

[0001] This utility model belongs to the field of petroleum extraction technology, and specifically relates to a mobile petroleum nitrogen injection and generation machine. Background Technology

[0002] During oil extraction, to ensure wellbore safety and enhance oil recovery, mobile nitrogen injection units are used to inject nitrogen into the well. The injected nitrogen can displace crude oil to maintain formation pressure, and its inert properties can replace fluids within the wellbore to eliminate risks. It can also be used for pipeline purging.

[0003] When a mobile petroleum nitrogen generator produces nitrogen, it needs to extract air from the natural environment using an air compressor. Since the air in the natural environment contains a lot of impurities, in order to avoid the equipment from shutting down due to impurities, the air needs to be filtered through a multi-stage filtration device before entering the nitrogen generator.

[0004] When cleaning or replacing the filter layers inside a multi-stage filtration unit, operators need to use special tools to remove the entire housing of the multi-stage filtration unit from its mounting base. The exposed filter layers are then removed from the inside of the housing and replaced or cleaned. The entire process is quite cumbersome and time-consuming. Utility Model Content

[0005] To address the cumbersome process of disassembling and cleaning the filter layer, this invention proposes a mobile petroleum nitrogen injection generator to overcome the aforementioned technical problems in existing related technologies.

[0006] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution: This utility model is a mobile petroleum nitrogen injection generator, including a base, a nitrogen generator body and an air compressor. The top of the base is fixedly connected to an air extraction pipe, which is connected to the air compressor. The air extraction pipe has several plug-in sealing components inside, and a filter layer is provided inside each plug-in sealing component. The outer surface of the air extraction pipe is provided with elastic fixing components corresponding to the plug-in sealing components. Separating components are provided on the upper and lower sides of the several plug-in sealing components. The plug-in sealing assembly is used to move the filter layer into the interior of the extraction pipe, and the elastic fixing assembly is used to fix the plug-in sealing assembly inside the extraction pipe. The air compressor draws air from the external environment through the extraction pipe.

[0007] Furthermore, the plug-in sealing assembly includes plug-in grooves, a plurality of which are provided on the outer surface of the suction pipe, and a placement groove is provided on the inner wall of the suction pipe. The placement grooves are interconnected with the plug-in grooves, and a placement cylinder is movably connected inside the placement grooves. A plug-in plate is fixedly connected to the outer surface of the placement cylinder, and the plug-in plate is movably connected to the plug-in grooves. A handle is fixedly connected to the outer surface of the plug-in plate.

[0008] Furthermore, the inner walls of both the insertion slot and the placement slot are provided with sealing grooves, the outer surface of the placement cylinder and the inner wall of the insertion plate are fixedly connected with sealing strips, and the bottom of the inner wall of the placement cylinder is provided with a through groove.

[0009] Furthermore, the filter layer includes a filter screen, an activated carbon plate, and a glass fiber plate. Support rings are fixedly connected to the outer surfaces of the filter screen, activated carbon plate, and glass fiber plate. The support rings are disposed inside the placement cylinder. A connecting groove is provided at the top of the support ring. A connecting ring is movably connected inside the connecting groove. A pressing tube is fixedly connected to the top of the connecting ring. A limit ring is provided at the top of the pressing tube. The limit ring is fixedly connected to the suction tube.

[0010] Furthermore, the elastic fixing component storage tube is fixedly connected to the outer surface of the suction pipe. A fixing rod and a movable disk are movably connected inside the storage tube. The fixing rod and the movable disk are fixedly connected together. Both ends of the fixing rod penetrate the storage tube. A fixing block is fixedly connected to the outer surface of the plug plate. A fixing hole is opened at the top of the fixing block. The fixing rod is movably connected to the fixing hole. A spring is fixedly connected between the movable disk and the storage tube.

[0011] Furthermore, the separating assembly includes a separating plate, several of which are rotatably connected inside the suction pipe. A support frame is fixedly connected to the outer surface of the suction pipe, and the bottom of the support frame is fixedly installed on the top of the base. Several storage boxes are fixedly connected to one side of the support frame corresponding to the separating plate. The shaft end of the separating plate extends into the interior of the storage box, and a gear is fixedly connected to the outer surface of the shaft end. A rack is movably connected inside the storage box, and the rack passes through all the storage boxes and meshes with all the gears.

[0012] Furthermore, a drive screw is rotatably connected to the outer surface of the storage box, a drive plate is threadedly connected to the outer surface of the drive screw, the drive plate is fixedly connected to the rack, and a control disk is fixedly connected to the top of the drive screw.

[0013] This utility model has the following beneficial effects: 1. This utility model allows the fixing of the plug-in sealing component to be released by pulling the elastic fixing component, and then the plug-in sealing component can be directly extracted from the inside of the suction pipe. Then the filter layer can be removed from the inside of the plug-in sealing component. In the above setting, pulling the elastic fixing component directly can cause the plug-in sealing component to move the filter layer out from the inside of the suction pipe, which makes it more convenient to remove the filter layer from the inside of the suction pipe for cleaning or replacement.

[0014] 2. When the drive screw is rotated via the control panel, the drive screw drives the rack to move through the drive plate. At the same time, the moving rack drives the partition plate to rotate through the gear. Thus, the partition plates can divide the air extraction pipe into several sealed spaces according to the placement cylinder. This setting ensures that when the filter layer in any placement cylinder is replaced, external air cannot flow into the subsequent filter layer through that position. This achieves isolated maintenance of the single-stage filter unit, effectively avoiding short-circuiting of unfiltered air during replacement and preventing cross-contamination of the filter layers.

[0015] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the utility model embodiments, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the external outline structure of this utility model; Figure 2 For the present utility model Figure 1 Rear view structural diagram; Figure 3 This is a schematic diagram of the air extraction pipe structure of this utility model; Figure 4 This is a schematic diagram of the elastic fixing component structure of this utility model; Figure 5 This is a schematic diagram of the placement tube structure of this utility model; Figure 6 This is a schematic diagram of the separator component structure of this utility model; Figure 7 For the present utility model Figure 6 Enlarged structural diagram at point A in the middle; Figure 8 For the present utility model Figure 6 Enlarged structural diagram at point B; Figure 9 This is a schematic diagram of the limiting ring structure of this utility model; Figure 10 This is a schematic diagram of the pressing ring structure of this utility model; Figure 11 This is a schematic diagram of the filter layer structure of this utility model.

[0018] The attached diagram lists the components represented by each number as follows: 1. Base; 2. Nitrogen generator body; 3. Air compressor; 4. Extraction pipe; 5. Insertion sealing assembly; 501. Insertion groove; 502. Placement groove; 503. Placement cylinder; 504. Insertion plate; 505. Handle; 506. Sealing groove; 507. Sealing strip; 508. Through groove; 6. Filter layer; 601. Filter screen; 602. Activated carbon plate; 603. Fiberglass board; 604. Support ring; 605. Connecting groove; 60 6. Connecting ring; 607. Pressing tube; 608. Limiting ring; 7. Elastic fixing component; 701. Storage tube; 702. Fixing rod; 703. Moving disc; 704. Fixing block; 705. Fixing hole; 706. Spring; 8. Dividing component; 801. Dividing plate; 802. Support frame; 803. Storage box; 804. Gear; 805. Rack; 806. Drive screw; 807. Drive plate; 808. Control panel. Detailed Implementation

[0019] The technical solutions of the utility model embodiments will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the utility model, and not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the utility model.

[0020] In the description of this utility model, it should be understood that the terms "opening", "upper", "lower", "top", "middle", "inner", etc., which indicate orientation or positional relationship, are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the utility model.

[0021] Please see Figures 1-11As shown, this utility model is a mobile petroleum nitrogen generator, including a base 1, a nitrogen generator body 2 and an air compressor 3. The top of the base 1 is fixedly connected to an air extraction pipe 4, which is connected to the air compressor 3. The air extraction pipe 4 is provided with several plug-in sealing components 5 inside, and a filter layer 6 is provided inside the plug-in sealing components 5. The outer surface of the air extraction pipe 4 is provided with elastic fixing components 7 corresponding to the plug-in sealing components 5. The upper and lower sides of the several plug-in sealing components 5 are provided with separating components 8. The plug-in sealing assembly 5 is used to move the filter layer 6 into the interior of the extraction pipe 4. The elastic fixing assembly 7 is used to fix the plug-in sealing assembly 5 inside the extraction pipe 4. The air compressor 3 draws air from the external environment through the extraction pipe 4.

[0022] In nitrogen production, air compressor 3 first draws and compresses air from the external environment through extraction pipe 4. The compressed air then enters a storage tank for buffering and initial cooling, causing some water vapor to condense and precipitate. The cooled air is temporarily stored in an air buffer tank to stabilize the pressure before entering the core unit of the nitrogen generator 2, a dual adsorption tower. Inside the tower, carbon molecular sieves preferentially adsorb oxygen based on the pressure swing adsorption principle, enriching nitrogen and continuously outputting it. The two towers alternately complete the adsorption and regeneration cycle through an automatic valve group. The produced nitrogen finally enters a nitrogen buffer tank for mixing and pressure equalization, and then passes through an end dust filter to remove any molecular sieve powder it may be carrying, thus obtaining a clean, high-purity nitrogen product for direct use in oilfield nitrogen injection operations.

[0023] When the filtration effect of filter layer 6 reaches the predetermined value and it is necessary to replace or clean filter layer 6, the separation component 8 is driven to separate the filter layers 6 by several separation ends. Then, the fixing end of the elastic fixing component 7 is pulled so that the fixing end is no longer fixed to the plug-in sealing component 5. Then, the plug-in sealing component 5 is pulled directly so that the filter layer 6 can be moved out of the air extraction pipe 4. Finally, the filter layer 6 inside the plug-in sealing component 5 can be taken out and cleaned or replaced.

[0024] By pulling the elastic fixing component 7, the fixing of the plug-in sealing component 5 can be released, and then the plug-in sealing component 5 can be directly pulled out from the inside of the suction pipe 4. Then, the filter layer 6 can be taken out from the inside of the plug-in sealing component 5. In the above configuration, by directly pulling the elastic fixing component 7, the plug-in sealing component 5 can move the filter layer 6 out from the inside of the suction pipe 4, which makes it more convenient to remove the filter layer 6 from the inside of the suction pipe 4 for cleaning or replacement.

[0025] In one embodiment, the plug-in sealing assembly 5 includes a plug-in groove 501, which has a plurality of grooves on the outer surface of the suction pipe 4. The inner wall of the suction pipe 4 has a placement groove 502, which is in communication with the plug-in groove 501. A placement cylinder 503 is movably connected inside the placement groove 502. A plug-in plate 504 is fixedly connected to the outer surface of the placement cylinder 503. The plug-in plate 504 is movably connected to the plug-in groove 501, and a handle 505 is fixedly connected to the outer surface of the plug-in plate 504.

[0026] By pulling the plug plate 504 through the handle 505, the plug plate 504 can be moved out of the plug slot 501. At the same time, the placement cylinder 503 can be moved out of the placement slot 502 through the plug slot 501 under the pull of the plug plate 504. In the above configuration, the plug plate 504 and the plug slot 501 cooperate to block the opening of the placement slot 502, so that the sealing of the opening of the placement slot 502 can be guaranteed when the placement cylinder 503 moves into the air extraction pipe 4.

[0027] In one embodiment, for the aforementioned insertion groove 501, both the inner walls of the insertion groove 501 and the placement groove 502 are provided with sealing grooves 506, the outer surface of the placement cylinder 503 and the inner wall of the insertion plate 504 are fixedly connected with sealing strips 507, and the bottom of the inner wall of the placement cylinder 503 is provided with a through groove 508.

[0028] After the placement cylinder 503 moves into the placement groove 502, the sealing strip 507 can move into the sealing groove 506. At this time, the sealing strips 507 and the corresponding sealing grooves 506 cooperate to seal the position where the placement cylinder 503 contacts the placement groove 502 and the position where the plug plate 504 contacts the plug groove 501. The above setting can effectively prevent air from leaking at the opening of the placement groove 502. When the air compressor 3 draws air from the external environment through the air extraction pipe 4, the air flowing inside the air extraction pipe 4 can pass through the through groove 508 from the placement cylinder 503.

[0029] In one embodiment, the filter layer 6 includes a filter screen 601, an activated carbon plate 602, and a glass fiber plate 603. Support rings 604 are fixedly connected to the outer surfaces of the filter screen 601, activated carbon plate 602, and glass fiber plate 603. The support rings 604 are disposed inside the placement cylinder 503. A connecting groove 605 is formed at the top of the support ring 604. A connecting ring 606 is movably connected inside the connecting groove 605. A pressing tube 607 is fixedly connected to the top of the connecting ring 606. A limiting ring 608 is provided at the top of the pressing tube 607, and the limiting ring 608 is fixedly connected to the suction pipe 4.

[0030] Filter 601 can filter large particles and large amounts of liquid water, activated carbon plate 602 can filter oil mist, gaseous oil vapor, and odor molecules, and glass fiber plate 603 can filter residual fine oil mist and dust. By moving the support ring 604 into the placement cylinder 503, the support ring 604 can move the corresponding filter 601, activated carbon plate 602, or glass fiber plate 603 to the bottom of the placement cylinder 503. Then, the pressing tube 607 is moved into the placement cylinder 503, and the connecting ring 606 can be moved to... Inside the connecting groove 605; after the placement cylinder 503 is moved into the placement groove 502, the top of the pressing tube 607 can contact the bottom of the limiting ring 608. At this time, the limiting ring 608 limits the support ring 604 through the pressing tube 607, so that the support ring 604 will not shake up and down at the bottom of the placement cylinder 503; at the same time, the connecting groove 605 and the connecting ring 606 can seal the contact position between the pressing tube 607 and the support ring 604, thereby preventing air from flowing directly to the next filtration position through the connection position.

[0031] In one embodiment, for the aforementioned elastic fixing component 7, the elastic fixing component 7 has a storage cylinder 701, which is fixedly connected to the outer surface of the suction pipe 4. The storage cylinder 701 is movably connected to a fixing rod 702 and a moving disk 703. The fixing rod 702 and the moving disk 703 are fixedly connected together, and both ends of the fixing rod 702 penetrate the storage cylinder 701. The outer surface of the plug plate 504 is fixedly connected to a fixing block 704, and the top of the fixing block 704 has a fixing hole 705. The fixing rod 702 is movably connected to the fixing hole 705. A spring 706 is fixedly connected between the moving disk 703 and the storage cylinder 701.

[0032] Spring 706 can push fixed rod 702 downward through movable disc 703, thereby moving fixed rod 702 into fixed hole 705. At this time, fixed rod 702 can fix plug plate 504 through fixed block 704, so that plug plate 504 will not move out of plug slot 501 at will. When it is necessary to move placement cylinder 503 out of the suction pipe 4, pull fixed rod 702 upward directly, so that fixed rod 702 can move out of fixed hole 705 while pressing spring 706 upward through movable disc 703. Then, by pulling handle 505, placement cylinder 503 can be moved out of suction pipe 4.

[0033] In one embodiment, the partition assembly 8 includes a partition plate 801, several partition plates 801 are rotatably connected inside the suction pipe 4, a support frame 802 is fixedly connected to the outer surface of the suction pipe 4, the bottom of the support frame 802 is fixedly installed on the top of the base 1, several storage boxes 803 are fixedly connected to one side of the support frame 802 corresponding to the partition plate 801, the shaft end of the partition plate 801 extends into the interior of the storage box 803, a gear 804 is fixedly connected to the outer surface of the shaft end, and a rack 805 is movably connected inside the storage box 803, the rack 805 passes through all the storage boxes 803 and meshes with all the gears 804.

[0034] Several placement cylinders 503 are sequentially arranged between two adjacent partition plates 801. When the placement cylinder 503 is moved out of the air extraction pipe 4, the rack 805 is pulled, causing the rack 805 to drive all the gears 804 to rotate. The rotation of the large gear 804 drives the corresponding partition plate 801 to rotate, allowing the partition plate 801 to block the air extraction pipe 4. At this time, under the separation of the partition plate 801, the partition plate 801 can divide the air extraction pipe 4 into several sealed spaces according to the placement cylinder 503. This arrangement ensures that when the filter layer 6 installed inside a single placement cylinder 503 is replaced, the outside air will not flow through the insertion slot 501 at that position to the next filter layer 6.

[0035] In one embodiment, for the storage box 803, a drive screw 806 is rotatably connected to the outer surface of the storage box 803, a drive plate 807 is threadedly connected to the outer surface of the drive screw 806, the drive plate 807 is fixedly connected to the rack 805, and a control disk 808 is fixedly connected to the top end of the drive screw 806.

[0036] The drive screw 806 can be rotated by the control panel 808. The rotating drive screw 806 can drive the rack 805 to move inside the storage box 803 via the drive plate 807. By setting the drive screw 806 and drive plate 807 to drive the rack 805, the rack 805 will not drive the gear 804 to rotate as long as the control panel 808 is not rotated after it moves to the predetermined position. This ensures the firmness of the partition plate 801 when blocking the air extraction pipe 4.

[0037] Through the above technical solution, 1. By pulling the elastic fixing component 7, the fixing of the plug-in sealing component 5 can be released, and then the plug-in sealing component 5 can be directly extracted from the inside of the suction pipe 4. Then, the filter layer 6 can be removed from the inside of the plug-in sealing component 5. In the above setting, pulling the elastic fixing component 7 directly allows the plug-in sealing component 5 to move the filter layer 6 out of the inside of the suction pipe 4, making it convenient to remove the filter layer 6 from the inside of the suction pipe 4 for cleaning or replacement; 2. The drive screw 806 is controlled by the control panel 808. When rotating, the drive screw 806 drives the rack 805 to move through the drive plate 807. At the same time, the moving rack 805 drives the partition plate 801 to rotate through the gear 804. Thus, the partition plates 801 can divide the exhaust pipe 4 into several sealed spaces according to the placement cylinder 503. This setting ensures that when replacing the filter layer 6 in any placement cylinder 503, external air cannot flow into the subsequent filter layer 6 through that position. This achieves isolated maintenance of the single-stage filter unit, effectively avoiding short-circuiting of unfiltered air during replacement, and also preventing cross-contamination of the filter layer 6.

[0038] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0039] The preferred embodiments of the utility model disclosed above are merely illustrative of the utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the utility model, thereby enabling those skilled in the art to better understand and utilize it. The utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A mobile petroleum nitrogen injection generator, comprising a base (1), a nitrogen generator body (2), and an air compressor (3), characterized in that, The top of the base (1) is fixedly connected to an air extraction pipe (4), which is connected to an air compressor (3). The air extraction pipe (4) is provided with several plug-in sealing components (5), and the plug-in sealing components (5) are provided with a filter layer (6). The outer surface of the air extraction pipe (4) is provided with an elastic fixing component (7) corresponding to the plug-in sealing components (5). The upper and lower sides of the several plug-in sealing components (5) are provided with a partition component (8). The plug-in sealing assembly (5) is used to move the filter layer (6) into the interior of the extraction pipe (4), the elastic fixing assembly (7) is used to fix the plug-in sealing assembly (5) inside the extraction pipe (4), and the air compressor (3) extracts air from the external environment through the extraction pipe (4).

2. The mobile petroleum nitrogen injection generator according to claim 1, characterized in that, The plug-in sealing assembly (5) includes a plug-in groove (501), which has a plurality of openings on the outer surface of the suction pipe (4). The inner wall of the suction pipe (4) has a placement groove (502), which is connected to the plug-in groove (501). The placement groove (502) is movably connected to the inside of the placement groove (502), and the outer surface of the placement groove (503) is fixedly connected to the plug-in plate (504). The plug-in plate (504) is movably connected to the plug-in groove (501), and the outer surface of the plug-in plate (504) is fixedly connected to the handle (505).

3. A mobile petroleum nitrogen injection generator according to claim 2, characterized in that, The inner walls of the insertion groove (501) and the placement groove (502) are provided with sealing grooves (506), and the outer surface of the placement cylinder (503) and the inner wall of the insertion plate (504) are fixedly connected with sealing strips (507). The bottom of the inner wall of the placement cylinder (503) is provided with a through groove (508).

4. A mobile petroleum nitrogen injection generator according to claim 2, characterized in that, The filter layer (6) includes a filter screen (601), an activated carbon plate (602), and a glass fiber plate (603). The outer surfaces of the filter layer (6) including the filter screen (601), the activated carbon plate (602), and the glass fiber plate (603) are all fixedly connected with support rings (604). The support rings (604) are located inside the placement cylinder (503). A connecting groove (605) is provided at the top of the support ring (604). A connecting ring (606) is movably connected inside the connecting groove (605). A pressing tube (607) is fixedly connected at the top of the connecting ring (606). A limiting ring (608) is provided at the top of the pressing tube (607). The limiting ring (608) is fixedly connected to the suction pipe (4).

5. A mobile petroleum nitrogen injection generator according to claim 2, characterized in that, The elastic fixing component (7) is a storage tube (701). The storage tube (701) is fixedly connected to the outer surface of the air extraction pipe (4). The storage tube (701) is movably connected to a fixing rod (702) and a moving disk (703). The fixing rod (702) and the moving disk (703) are fixedly connected together. Both ends of the fixing rod (702) penetrate the storage tube (701). The outer surface of the plug plate (504) is fixedly connected to a fixing block (704). The top of the fixing block (704) is provided with a fixing hole (705). The fixing rod (702) is movably connected to the fixing hole (705). A spring (706) is fixedly connected between the moving disk (703) and the storage tube (701).

6. A mobile petroleum nitrogen injection generator according to claim 1, characterized in that, The partition assembly (8) includes a partition plate (801), which is rotatably connected to several partition plates (801) inside the exhaust pipe (4). A support frame (802) is fixedly connected to the outer surface of the exhaust pipe (4). The bottom of the support frame (802) is fixedly installed on the top of the base (1). Several storage boxes (803) are fixedly connected to one side of the support frame (802) corresponding to the partition plate (801). The shaft head of the partition plate (801) extends into the interior of the storage box (803). A gear (804) is fixedly connected to the outer surface of the shaft head. A rack (805) is movably connected inside the storage box (803). The rack (805) passes through all the storage boxes (803) and meshes with all the gears (804).

7. A mobile petroleum nitrogen injection generator according to claim 6, characterized in that, The outer surface of the storage box (803) is rotatably connected to a drive screw (806), the outer surface of the drive screw (806) is threadedly connected to a drive plate (807), the drive plate (807) is fixedly connected to a rack (805), and the top end of the drive screw (806) is fixedly connected to a control panel (808).

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