Hot air drying equipment for sludge

Abstract

The utility model relates to the technical field of sludge treatment, in particular to sludge hot air drying equipment which is used for stirring sludge, so that the sludge is uniformly heated, the drying effect is ensured, and the sludge hot air drying efficiency is improved. Comprising a base, a supporting frame, a drying cylinder, a lifting assembly, a covering assembly, a stirring assembly and a discharging assembly, the supporting frame is installed on the top of the base, the drying cylinder is installed on the supporting frame through the lifting assembly, the covering assembly is installed on the top of the supporting frame, the stirring assembly is installed in the drying cylinder, and the discharging assembly is installed at the bottom of the drying cylinder.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of sludge treatment, in particular to a sludge hot -air drying equipment. BACKGROUND

[0002] Sludge refers to the fine-grained soil deposited in still water and slow-flowing water environment and containing organic matter, called silt soil, also known as sludge, with the development of cities and the aggravation of environmental pollution, the construction of urban sewage treatment plants in China has begun to accelerate development. How to dispose of the sludge generated in the sewage treatment process has also become a new problem faced by society. In order to reduce the disposal cost of sludge, it is necessary to first dewater the sludge and reduce its volume, and after mechanical dewatering, the volume of sludge can only be further reduced after the water in the sludge is evaporated using drying technology. The existing technology announcement No. CN220887298U proposes a kind of sludge drying device, including the inner grinding column for excluding moisture when sludge is initially processed and the screen frame for compacting sludge loose, the outer grinding sleeve is fixedly connected with the inner side wall of the box through the fixed rod, the inner side wall of the box is connected with the fixed end of the hydraulic rod controlled by the auxiliary support and the telescopic, the moving part of the hydraulic rod is connected with one side of the screen frame, the screen frame is embedded with screen mesh for facilitating the initial processing of sludge compaction screening, the other side of the screen frame is slidably connected with stroke column through the connecting movable rod. However, when the sludge is heated and dried by hot air, due to uneven heating, water exists in the sludge, and when the hot air heats the sludge, the hot air is scattered in the equipment, which easily affects the sludge hot air drying efficiency. CONTENT OF UTILITY MODEL

[0003] To solve the above technical problems, the utility model provides a kind of sludge hot air drying equipment, which stirs sludge, makes sludge heat evenly, ensures drying effect and improves sludge hot air drying efficiency.

[0004] The sludge hot air drying equipment of the utility model includes base, support frame, drying cylinder, lifting assembly, cover assembly, stirring assembly and discharge assembly, the base top is installed with support frame, and the support frame is installed with drying cylinder by lifting assembly, and the support frame top is installed with cover assembly, and the drying cylinder interior is installed with stirring assembly, and the drying cylinder bottom is installed with discharge assembly;After sludge is added to the drying cylinder, the lifting assembly drives the drying cylinder to move upward and contact with the cover assembly, to heat and dry the sludge inside, the stirring assembly can stir the sludge in the drying cylinder, make the sludge heat evenly, ensure drying effect, and the discharge assembly can conveniently discharge the dried sludge from the drying cylinder, facilitate use and improve practicability.

[0005] Preferably, the lifting assembly comprises two lifting lead screws, two gearboxes, a double-output motor, two transmission shafts, two lifting blocks, two lifting boxes and a rotating part, lifting grooves are formed in the inner walls of the left and right ends of the support frame, the lifting lead screws are rotatably installed in the lifting grooves, the top portions of the lifting lead screws are rotatably penetrated through the top of the support frame and connected with the output ends of the gearboxes, the double-output motor is installed at the middle portion of the top of the support frame, the left and right output ends of the double-output motor are connected with the input ends of the gearboxes through the transmission shafts, the lifting blocks are slidably installed in the lifting grooves and are screwed on the outer walls of the lifting lead screws, the outer walls of the lifting blocks are connected with the lifting boxes, and the drying cylinders are located between the two lifting boxes; the double-output motor is started to drive the lifting lead screws to rotate through the transmission shafts and the gearboxes, so that the lifting blocks move in the lifting grooves and drive the drying cylinders to move up and down, thereby facilitating the addition and discharge of sludge and facilitating use.

[0006] Preferably, the cover assembly comprises a top cover, a plurality of connecting columns, a heater and a positioning ring, the top cover is installed at the bottom end of the top of the support frame through the connecting columns, the heater is installed at the bottom of the top cover, a heating cavity is formed in the middle of the inner wall of the drying cylinder, a heating plate is arranged in the heating cavity, a ventilation filter screen is arranged in the top of the drying cylinder and communicates with the heating cavity, a plug-in groove is formed in the bottom of the top cover, and a positioning ring matched with the plug-in groove is installed at the top of the drying cylinder; after the sludge is added into the drying cylinder, the drying cylinder is moved upward, so that the positioning ring enters the plug-in groove, and the top cover is covered on the top of the drying cylinder; the top cover is provided with a moisture discharge hole, and the sludge in the drying cylinder is heated and dried by the heater at the bottom of the top cover and the heating plate in the heating cavity, and the water vapor is discharged through the moisture discharge hole.

[0007] Preferably, the stirring assembly comprises a rotating shaft, a plurality of mounting rods, a plurality of stirring blades, a pushing fan wheel, a driving motor and a spline shaft, the rotating shaft is rotatably installed at the bottom of the inside of the drying cylinder, a plurality of mounting rods are connected with the rotating shaft in the axial direction, the stirring blades are installed on the mounting rods, the pushing fan wheel is installed on the upper portion of the rotating shaft, the driving motor is installed at the middle portion of the top of the top cover, the output shaft of the driving motor is provided with the spline shaft which penetrates through the top of the top cover, and a spline groove matched with the spline shaft is formed in the top of the rotating shaft; when the drying cylinder is moved upward, the rotating shaft is driven to move upward, so that the spline shaft is inserted into the spline groove; during heating and drying, the driving motor is started to drive the rotating shaft to rotate through the spline shaft, the rotating shaft drives the mounting rods and the stirring blades to rotate, the sludge in the drying cylinder is stirred, the sludge is uniformly heated, the drying effect is ensured, and the rotating shaft drives the pushing fan wheel to rotate at the same time, the hot air at the upper portion is pushed downward, and the hot flow is in full contact with the sludge in the drying cylinder, thereby improving the overall drying effect of the equipment.

[0008] Preferably, the discharging assembly comprises a second driving motor, a rotating seat, a connecting turntable, a supporting bearing, a plurality of cleaning scrapers, a plurality of connecting rods and supporting blocks, the bottom end of the drying cylinder is in a conical shape, the second driving motor is installed at the bottom of the drying cylinder, the output end of the second driving motor is provided with the rotating seat which is installed through the bottom of the drying cylinder, the rotating seat is rotatably installed in the conical part, the upper part of the rotating seat is provided with a sunken groove, the bottom of the rotating shaft is rotatably connected in the sunken groove through the connecting turntable, a plurality of cleaning scrapers are axially and uniformly installed on the outer wall of the upper part of the rotating seat, the bottom of the rotating shaft is connected with the top outer wall of the rotating seat through the supporting bearing, the cleaning scrapers are in sliding contact with the inner wall of the drying cylinder, the upper inner wall of the cleaning scrapers is fixedly connected with the connecting rods, the middle part of the plurality of connecting rods is fixedly installed with the supporting blocks, the middle part of the supporting blocks is in rotational contact with the rotating shaft, and the upper and lower sides of the supporting blocks are in a conical shape; the second driving motor is started to drive the rotating seat to rotate, the rotating seat drives the cleaning scrapers to rotate, the inner wall of the drying cylinder is scraped and cleaned, the sludge is prevented from adhering to the inner wall, the sludge is uniformly heated, the rotating shaft is rotatably supported through the supporting bearing, the connecting rods and the supporting blocks, the stability during use is ensured, and the sludge is scraped and pushed out by the rotating cleaning scrapers during discharging.

[0009] Preferably, the rotating part comprises two speed reducer motors, two rotating tables and two limiting guide rings, the two speed reducer motors are installed in the two lifting boxes respectively, the output end of the speed reducer motor is connected with the rotating table which penetrates through the outer wall of the lifting box, the outer wall of the lifting box is provided with a limiting rotating ring, the limiting guide ring is rotatably installed in the limiting rotating ring, and the two limiting guide rings are installed on the side walls of the rotating tables respectively, and the two rotating tables are fixedly connected with the outer wall of the drying cylinder; the speed reducer motor is started to drive the rotating table to rotate, the rotating table drives the drying cylinder to rotate to adjust the angle, which is convenient for discharging outward and feeding inward, and the limiting guide ring is driven to rotate in the limiting rotating ring to support and guide the rotating table when the rotating table rotates, so that the stability is ensured.

[0010] Preferably, the device further comprises a supporting base, two groups of reinforcing ribs and two groups of limiting slides, the supporting base is installed at the bottom of the base, the reinforcing ribs are obliquely installed at the front and rear ends of the supporting frame, the reinforcing ribs are connected with the top of the base, the inner wall of the supporting frame is symmetrically provided with limiting guide grooves about the front and rear of the lifting sliding groove, the limiting slides are symmetrically installed at the front and rear ends of the side wall of the lifting box and are slidably installed in the limiting guide grooves; the device bottom is supported through the supporting base, the reinforcing ribs can increase the connecting strength between the supporting frame and the base, so that the stability is ensured, and the limiting slide is driven to move in the limiting guide groove when the lifting box moves up and down, so that the limiting slide is guided and limited, and the structural strength is improved.

[0011] The utility model discloses the beneficial effect compared with prior art is: after the silt is added to the drying cylinder, the lifting assembly drives the drying cylinder to move upwards and contacts with the cover assembly, heats and dry the silt in the inside, and the agitating component can agitate the silt in the drying cylinder, makes the silt even heat, guarantees the dry effect, can conveniently discharge the silt after drying through the discharge component drying cylinder, convenient to use, improves practicality. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is the structure schematic diagram of the utility model;

[0013] Figure 2 It is the structure schematic diagram of the utility model of the shaft measurement;

[0014] Figure 3 It is the internal structure schematic diagram of the utility model;

[0015] Figure 4 It is the front view cross section structure schematic diagram of the utility model;

[0016] Figure 5 It is the upper cross section structure schematic diagram of the utility model;

[0017] Mark in drawing: 1, base;2, support frame;3, support base;4, reinforcing rib;5, drying cylinder;6, top cover;7, connecting column;8, heater;9, lifting screw;10, transmission;11, double output motor;12, transmission shaft;13, lifting block;14, lifting box;15, limit sliding bracket;16, speed reducer motor;17, rotary table;18, limit guide ring;19, rotating shaft;20, mounting rod;21, stirring vane;22, push fan wheel;23, drive motor;24, spline shaft;25, second drive motor;26, rotating seat;27, connecting turntable;28, support bearing;29, cleaning scraper;30, connecting rod;31, support block;32, positioning insert ring;33, ventilation filter screen. DETAILED DESCRIPTION

[0018] In order to facilitate understanding the utility model, below will refer to relevant drawing and carry out more comprehensive description to the utility model.The utility model can realize in many different forms, and is not limited to the embodiment described in this paper.Contrarily, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and comprehensive. Embodiment 1

[0019] As Figure 1 , Figure 3 , Figure 4 And Figure 5As shown, the base 1 top is mounted with support frame 2, support frame 2 left and right ends of the inner wall on the opening of the lifting slide, lifting lead screw 9 rotationally installed in the lifting slide, lifting lead screw 9 top rotationally penetrates the support frame 2 top and the output end of the transmission 10 is connected, double output motor 11 is installed in the support frame 2 top middle, double output motor 11 left and right side output end through transmission shaft 12 and the input end of the transmission 10 is connected, lifting block 13 is slidably installed in the lifting slide, and the lifting block 13 is screwed on the outer wall of the lifting lead screw 9, the outer wall of the lifting block 13 is connected with the lifting box 14, the drying cylinder 5 is located between the two lifting boxes 14, the top cover 6 top is installed on the support frame 2 top bottom end through a plurality of connecting columns 7, the top cover 6 bottom is installed with the heater 8, the inner wall of the drying cylinder 5 is provided with a heating cavity, the heating cavity is provided with a heating plate, the top of the drying cylinder 5 is provided with a ventilation filter screen 33 in communication with the heating cavity, the bottom of the top cover 6 is provided with a plug-in slot, the top of the drying cylinder 5 is provided with a positioning plug ring 32 matched with the plug-in slot, the rotating shaft 19 is rotatably installed in the inner bottom of the drying cylinder 5, a plurality of mounting rods 20 are connected to the lower part of the rotating shaft 19 in the axial direction, the mounting rods 20 are installed with stirring blades 21, the rotating shaft 19 is installed with a push fan wheel 22, a driving motor 23 is installed in the top middle of the top cover 6, the output shaft of the driving motor 23 is installed with a spline shaft 24 through the top end of the top cover 6, the top of the rotating shaft 19 is provided with a spline groove matched with the spline shaft 24;

[0020] Start double output motor 11 through transmission shaft 12 and transmission 10 drive lifting lead screw 9 rotation, make lifting block 13 move in lifting slide, drive drying cylinder 5 up and down, add and discharge sludge, convenient to use, drying cylinder 5 after adding sludge, move up, make positioning plug ring 32 enter plug-in slot, top cover 6 cover in drying cylinder 5 top, top cover 6 top is provided with a vent hole, through the heater 8 of the bottom of the top cover 6 and the heating plate in the heating cavity, sludge in the drying cylinder 5 is heated and dried, water vapor is discharged through the vent hole, when the drying cylinder 5 moves up, drive rotating shaft 19 to move up, make spline shaft 24 insert into spline groove, when heating and drying, start driving motor 23 through spline shaft 24 drive rotating shaft 19 rotation, rotating shaft 19 drive mounting rod 20 and stirring blade 21 rotation, agitate sludge in the drying cylinder 5, make sludge heat evenly, ensure drying effect, rotating shaft 19 rotation drives push fan wheel 22 rotation, push hot gas downward, make hot flow and sludge in the drying cylinder 5 fully contact, improve the drying effect of the whole equipment. Example 2

[0021] As Figures 2 to 4The bottom end of the drying cylinder 5 is conical, the second driving motor 25 is installed at the bottom of the drying cylinder 5, the output end of the second driving motor 25 is installed with a rotating seat 26 through the bottom of the drying cylinder 5, the rotating seat 26 is rotatably installed in the conical part, a sinking groove is formed in the upper part of the rotating seat 26, the bottom of the rotating shaft 19 is rotatably connected to the sinking groove through a connecting turntable 27, a plurality of cleaning scrapers 29 are axially and uniformly installed on the outer wall of the upper part of the rotating seat 26, the outer wall of the lower part of the rotating shaft 19 is connected to the outer wall of the top of the rotating seat 26 through a supporting bearing 28, the cleaning scrapers 29 are in sliding contact with the inner wall of the drying cylinder 5, the upper inner wall of the cleaning scrapers 29 is fixedly connected with a connecting rod 30, a plurality of supporting blocks 31 are fixedly installed in the middle of the connecting rods 30, the supporting blocks 31 are in rotational contact with the rotating shaft 19, the upper and lower sides of the supporting blocks 31 are conical, the two reduction motors 16 are installed in the two lifting boxes 14 respectively, the output end of the reduction motor 16 is connected with a rotating table 17 through the outer wall of the lifting box 14, a limiting rotating ring is formed in the outer wall of the lifting box 14, the limiting guide ring 18 is rotatably installed in the limiting rotating ring, and the two limiting guide rings 18 are installed on the side walls of the rotating table 17 respectively, the two rotating tables 17 are fixedly connected with the outer wall of the drying cylinder 5, the supporting base 3 is installed at the bottom of the base 1, the reinforcing ribs 4 are obliquely installed at the front and rear ends of the supporting frame 2, the reinforcing ribs 4 are connected with the top of the base 1, the inner wall of the supporting frame 2 is symmetrically provided with a limiting guide groove about the lifting sliding groove, the limiting sliding frames 15 are symmetrically installed at the front and rear ends of the side walls of the lifting box 14, and the limiting sliding frames 15 are slidingly installed in the limiting guide groove;

[0022] The second driving motor 25 is started to drive the rotating seat 26 to rotate, the rotating seat 26 drives the cleaning scrapers 29 to rotate, the inner wall of the drying cylinder 5 is scraped and cleaned, the sludge is prevented from adhering to the inner wall, the uniformity of sludge heating is ensured, the rotating shaft 19 can be rotatably supported by the supporting bearing 28, the connecting rod 30 and the supporting block 31, the stability during use is ensured, when discharging, the cleaning scrapers 29 are rotated to scrape and push out the sludge, the reduction motor 16 is started to drive the rotating table 17 to rotate, the rotating table 17 drives the drying cylinder 5 to rotate to adjust the angle, which is convenient for discharging outward and feeding inward, the limiting guide ring 18 is driven to rotate in the limiting rotating ring to support and guide the rotating table 17 when the rotating table 17 rotates, the stability is ensured, the bottom of the equipment is supported by the supporting base 3, the connecting strength between the supporting frame 2 and the base 1 is increased by the reinforcing ribs 4, and the stability is ensured, the limiting sliding frames 15 are moved in the limiting guide groove when the lifting box 14 moves up and down, the limiting sliding frames 15 are guided and limited, and the structural strength is improved.

[0023] As Figures 1 to 5As shown, the silt hot air drying equipment of the utility model, in working, through supporting base 3 support equipment bottom, start double output motor 11 through transmission shaft 12 and transmission 10 drive lift screw 9 rotation, make lift block 13 move in lift chute, drive drying cylinder 5 up and down movement, convenient to add and discharge sludge, drying cylinder 5 add sludge and move upwards, make positioning ring 32 enter the plug-in slot, top cover 6 cover and install in drying cylinder 5 top, top cover 6 top is provided with wet hole, through heater 8 of top cover 6 bottom and heating plate in heating cavity to sludge in drying cylinder 5 inside heating drying, drying cylinder 5 move upwards, drive shaft 19 move upwards, make spline shaft 24 insert spline groove, start drive motor 23 when heating drying through spline shaft 24 drive shaft 19 rotation, drive shaft 19 drive mounting rod 20 and stirring vane 21 rotation, to sludge in drying cylinder 5 inside agitating, make sludge heat evenly, start second drive motor 25 drive rotary seat 26 rotation, rotary seat 26 drive cleaning scraper 29 rotation, to drying cylinder 5 inner wall scraping cleaning, avoid sludge adhere to the inner wall, guarantee sludge heat evenly, drive shaft 19 rotation simultaneously drive push fan wheel 22 rotation, push the upper hot gas downward, make hot flow and sludge in drying cylinder 5 inside fully contact, start speed reducer 16 drive turntable 17 rotation, turntable 17 drive drying cylinder 5 rotation adjustment angle, convenient to outward discharge material, cleaning scraper 29 rotation sludge scraping and pushing out simultaneously.

[0024] The heater 8, the transmission 10, the double output motor 11, the speed reducer 16, the drive motor 23, the second drive motor 25 and the connecting turntable 27 of the silt hot air drying equipment of the utility model are purchased on the market, and the technical personnel in the industry only need to install and operate according to the attached instruction manual, without the technical personnel in the field paying creative labor.

[0025] The above is only the preferred embodiment of the utility model, and it should be pointed out that, for ordinary technical personnel in the technical field, without departing from the technical principle of the utility model, a number of improvements and modifications can be made, and these improvements and modifications should be regarded as the protection range of the utility model.

Claims

1. A sludge hot air drying apparatus characterized by, It include base (1), support frame (2), drying cylinder (5), lifting assembly, cover assembly, stirring assembly and discharge assembly, the top of base (1) is installed with support frame (2), support frame (2) is installed with drying cylinder (5) through lifting assembly, the top of support frame (2) is installed with cover assembly, the inside of drying cylinder (5) is installed with stirring assembly, the bottom of drying cylinder (5) is installed with discharge assembly.

2. A sludge hot air drying apparatus as claimed in claim 1, characterized in that, Lifting assembly includes two lifting lead screws (9), two gearboxes (10), double output motor (11), two transmission shafts (12), two lifting blocks (13), two lifting boxes (14) and rotating parts, the inner wall of the left and right two ends of support frame (2) is provided with lifting sliding slot, lifting lead screw (9) is rotatably installed in lifting sliding slot, the top of lifting lead screw (9) is rotatably penetrated through the top of support frame (2) and connected with the output end of gearbox (10), double output motor (11) is installed at the top middle part of support frame (2), the left and right side output ends of double output motor (11) are connected with the input end of gearbox (10) through transmission shaft (12), lifting block (13) is slidably installed in lifting sliding slot, and lifting block (13) is screwed on the outer wall of lifting lead screw (9), lifting box (14) is connected on the outer wall of lifting block (13), and drying cylinder (5) is located between the two lifting boxes (14).

3. A sludge hot air drying apparatus as claimed in claim 1, wherein, Cover assembly includes top cover (6), a plurality of connecting columns (7), heater (8) and positioning ring (32), the top of top cover (6) is installed at the top bottom end of support frame (2) through a plurality of connecting columns (7), and heater (8) is installed at the bottom of top cover (6), a heating cavity is formed in the middle of the inner wall of drying cylinder (5), a heating plate is arranged in the heating cavity, a ventilation filter screen (33) is arranged in the top of drying cylinder (5) and communicated with the heating cavity, a plug-in groove is formed in the bottom of top cover (6), and a positioning ring (32) matched with the plug-in groove is installed at the top of drying cylinder (5).

4. A sludge hot air drying apparatus as claimed in claim 1, wherein, Stirring assembly includes rotating shaft (19), a plurality of mounting rods (20), a plurality of stirring blades (21), push fan wheel (22), driving motor (23) and spline shaft (24), rotating shaft (19) is rotatably installed at the inside bottom of drying cylinder (5), a plurality of mounting rods (20) are connected with rotating shaft (19) in the lower part in the axial direction, stirring blades (21) are installed on mounting rods (20), push fan wheel (22) is installed on the upper part of rotating shaft (19), driving motor (23) is installed at the top middle part of top cover (6), spline shaft (24) is installed on the output shaft of driving motor (23) penetrating through the top end of top cover (6), and spline groove matched with spline shaft (24) is formed in the top of rotating shaft (19).

5. A sludge hot air drying apparatus as claimed in claim 4, wherein, The discharge assembly comprises a second driving motor (25), a rotating seat (26), a connecting rotating disc (27), a plurality of cleaning scrapers (29), a plurality of connecting rods (30) and support blocks (31), the inner bottom end of the drying cylinder (5) is tapered, the second driving motor (25) is installed at the bottom of the drying cylinder (5), the output end of the second driving motor (25) is provided with the rotating seat (26) penetrating through the bottom of the drying cylinder (5), the rotating seat (26) is rotatably installed in the tapered part, a sinking groove is formed in the upper part of the rotating seat (26), the bottom of the rotating shaft (19) is rotatably connected in the sinking groove through the connecting rotating disc (27), a plurality of cleaning scrapers (29) are uniformly installed on the outer wall of the upper part of the rotating seat (26) in the axial direction, the outer wall of the lower part of the rotating shaft (19) is connected with the outer wall of the top of the rotating seat (26) through the support bearing (28), the cleaning scraper (29) is in sliding contact with the inner wall of the drying cylinder (5), the connecting rod (30) is fixedly connected to the inner wall of the upper part of the cleaning scraper (29), the support block (31) is fixedly installed in the middle of the connecting rod (30), the support block (31) is in rotational contact with the rotating shaft (19), and the upper and lower sides of the support block (31) are tapered.

6. A sludge hot air drying apparatus as claimed in claim 2, wherein, The rotating part comprises two speed reducer motors (16), two rotating tables (17) and two limiting guide rings (18), the two speed reducer motors (16) are installed in the two lifting boxes (14) respectively, the output end of the speed reducer motor (16) is connected with the rotating table (17) penetrating through the outer wall of the lifting box (14), the outer wall of the lifting box (14) is provided with a limiting rotating ring, the limiting guide ring (18) is rotatably installed in the limiting rotating ring, and the two limiting guide rings (18) are installed on the side walls of the rotating table (17) respectively, and the two rotating tables (17) are fixedly connected with the outer wall of the drying cylinder (5).

7. A sludge hot air drying apparatus as claimed in claim 2, wherein The supporting base (3), the two groups of reinforcing ribs (4) and the two groups of limiting slides (15) are further included, the supporting base (3) is installed at the bottom of the base (1), the reinforcing ribs (4) are obliquely installed at the front and rear ends of the supporting frame (2), the reinforcing ribs (4) are connected with the top of the base (1), the limiting guide grooves are symmetrically formed in the inner wall of the supporting frame (2) about the lifting sliding grooves, the limiting slides (15) are symmetrically installed at the front and rear ends of the side walls of the lifting box (14), and the limiting slides (15) are slidably installed in the limiting guide grooves.

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