CN220132031U - Municipal water conservancy project cyclic utilization device - Google Patents

Abstract

The utility model discloses a municipal water conservancy project recycling device which comprises a base, a cleaning mechanism and a cleaning mechanism, wherein a water collecting tank is arranged at the upper end of the base, a water inlet is formed in the front end of the water collecting tank, a large-aperture grille is connected in a sliding mode in the water collecting tank, a small-aperture grille is arranged at the rear side of the large-aperture grille, a blocking net frame is arranged at the rear side of the small-aperture grille, a blocking net is arranged on the blocking net frame, the right end of the water collecting tank is communicated with a filter tank through a first water suction pump, a filter cloth frame is arranged in the filter tank, filter cloth is arranged on the filter cloth frame, and a cleaning mechanism is arranged in the filter tank corresponding to the filter cloth. When the water enters the settling tank, the flocculant is added into the settling tank, the stirring mechanism is started again to stir the water in the settling tank, the reaction of heavier impurities in the water in the settling tank and the flocculant is quickened, the water is reprecipitated to the tank bottom, the reaction efficiency is improved, the time is reduced, and the precipitated substances contain metals and organic matters and can be recycled.

Description

Municipal water conservancy project cyclic utilization device

Technical Field

The utility model relates to the technical field of hydraulic engineering, in particular to a municipal hydraulic engineering recycling device.

Background

Hydraulic engineering is a project constructed for controlling and preparing surface water and underground water in nature to achieve the aim of removing harm and benefiting, and is also called as water engineering, and water is an essential precious resource for human production and life.

In urban water, the cyclic utilization of water resources becomes the first choice, the traditional water circulating device is not thorough enough when the water resources are recycled, the cyclic utilization rate is lower, and the waste of the water resources is serious. Therefore, the utility model provides a municipal water conservancy project recycling device to solve the problems.

Disclosure of Invention

The utility model aims to provide a municipal water conservancy project recycling device which aims to solve the problems in the background technology.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

the utility model provides a municipal water conservancy project cyclic utilization device, includes base, clearance mechanism and clearance mechanism, the base upper end is equipped with the header tank, and the header tank front end is equipped with the water inlet, and sliding connection large aperture grid in the header tank, and large aperture grid rear side is equipped with the aperture grid, and aperture grid rear side is equipped with the block frame, is equipped with the block on the block frame, the header tank right-hand member is equipped with the filter cloth frame through first suction pump intercommunication rose box in the rose box, is equipped with the filter cloth on the filter cloth frame, and corresponds the filter cloth in the rose box and be equipped with clearance mechanism, the rose box front end is equipped with rabbling mechanism through the second suction pump intercommunication rose box in the rose box, the rose box right-hand member is equipped with places the frame through the third suction pump intercommunication rose box in the rose box, is equipped with a plurality of through-holes on placing the frame, be equipped with the active carbon filter core board in placing the frame, place between frame and the active carbon filter core board and be connected through installation mechanism, and place the frame rear side and be equipped with clearance mechanism.

As a further scheme of the utility model, the cleaning mechanism comprises a supporting rod, a first electric telescopic rod and a cleaning plate, the cleaning plate is attached to the bottom end of the cleaning box, the outer wall of the cleaning plate is attached to the inner wall of the cleaning box, the first electric telescopic rod is arranged at the upper end of the cleaning plate, the supporting rod is arranged at the upper end of the first electric telescopic rod, the lower end of the supporting rod is fixedly connected with the base, the cleaning plate is driven to move upwards by starting the first electric telescopic rod, and therefore the inner wall of the cleaning box is cleaned, and the inner wall of the cleaning box is prevented from being polluted by water through adhering to scale for a long time.

As a still further scheme of the utility model, the stirring mechanism comprises a supporting plate, a motor, a rotating rod, a bearing and stirring rods, wherein the supporting plate is arranged at the upper end of the sedimentation tank, the motor is arranged at the upper end of the supporting plate, the rotating rod is arranged at the lower end of the motor, the rotating rod penetrates through the supporting plate, the bearing is arranged at the lower end of the rotating rod, the lower end of the bearing is fixedly connected with the bottom end of the sedimentation tank, the stirring rods are arranged on the rotating rod, the stirring mechanism is started to stir water in the sedimentation tank, the reaction of heavier impurities in the water in the sedimentation tank and flocculating agent is accelerated, the heavy impurities are precipitated to the bottom of the tank again, the reaction efficiency is improved, and the time is shortened.

As a still further scheme of the utility model, the left end and the right end of the large-aperture grille are provided with the first sliding blocks which are in sliding connection with the inner wall of the water collecting tank, the inner wall of the water collecting tank is provided with the first sliding grooves corresponding to the first sliding blocks, the left end and the right end of the small-aperture grille are provided with the second sliding blocks which are in sliding connection with the inner wall of the water collecting tank, the left end and the right end of the blocking net frame are provided with the third sliding blocks which are in sliding connection with the inner wall of the water collecting tank, the inner wall of the water collecting tank is provided with the third sliding grooves corresponding to the third sliding blocks, larger sundries can be filtered through the arranged large-aperture grille, the small-aperture grille can filter smaller sundries, the blocking net of the blocking net frame can prevent sundries from entering the filter tank, and the filtered sundries can be recycled.

As a still further scheme of the utility model, the installation mechanism comprises an installation block, clamping grooves, clamping blocks, a pull rod, a fixed block, handles and a second spring, wherein the installation block is symmetrically arranged at the left end and the right end of the active carbon filter core plate, the clamping grooves are arranged at the ends, far away from each other, of the installation block, the clamping blocks are clamped in the clamping grooves, the pull rods are arranged at the ends, far away from each other, of the two clamping blocks, the other ends of the pull rods are provided with the handles, the fixed block is connected onto the pull rods in a sliding manner, the lower ends of the fixed block are fixedly connected with the purifying box, the second spring is sleeved on the pull rods, one ends of the second spring are fixedly connected with the clamping blocks, and the other ends of the second spring are fixedly connected with the fixed block.

As a still further scheme of the utility model, the cleaning mechanism comprises a scraping plate, an electric sliding rail, a through groove, a baffle plate, a telescopic rod, a first spring, a pushing block and a second electric telescopic rod, wherein the scraping plate is attached to the upper end of the filter cloth frame, the scraping plate is in sliding connection with the filter cloth frame through the electric sliding rail, and an outlet is arranged at the right end of the filter box corresponding to the filter cloth frame.

As a still further scheme of the utility model, a through groove is arranged at one end of the filter cloth frame close to the outlet, a baffle plate is connected in the through groove in a sliding way, telescopic rods are symmetrically arranged at the front and back of the lower end of the baffle plate, the lower end of each telescopic rod is fixedly connected with the inner wall of the filter box through a connecting block, a first spring is sleeved on each telescopic rod, the upper end of each first spring is fixedly connected with the baffle plate, the lower end of each first spring is fixedly connected with the connecting block, a push block is symmetrically attached to the upper end of each baffle plate in a front-back way, a second electric telescopic rod is arranged at the upper end of each push block, during filtering, an electric sliding rail is started to drive a scraping plate to move downwards, the scraping plate scrapes earth on the filter cloth, meanwhile, the scraping plate and the baffle plate can squeeze the earth to dewater the earth, waste of water resources is avoided, the second electric telescopic rod is started to drive the push block to move downwards after extrusion, meanwhile, the first spring is compressed by the push block, the dewatered earth is discharged from the outlet, and the discharged earth is convenient for secondary use.

Compared with the prior art, the utility model has the beneficial effects that:

1. when the device is used, waste water is input into the water collecting tank through the water inlet, sequentially passes through the large-aperture grille, the small-aperture grille and the blocking net frame, then enters the filtering tank through the first water suction pump, larger sundries can be filtered through the arranged large-aperture grille, smaller sundries can be filtered through the small-aperture grille, the blocking net of the blocking net frame is further filtered, sundries can be prevented from entering the filtering tank, the filtered sundries can be recycled, filtered water is further filtered through the filter cloth on the filter cloth frame and then enters the settling tank through the second water suction pump, the electric sliding rail is started to drive the scraping plate to move downwards during filtering, the scraping plate scrapes the soil on the filter cloth, the scraped soil is blocked by the baffle, meanwhile, the scraping plate and the baffle can squeeze the soil to dehydrate the soil, the second electric telescopic rod is started to drive the pushing block to move downwards after extrusion, the baffle is driven to move downwards, meanwhile, the first spring is compressed, the dehydrated soil is discharged from the outlet, and the discharged soil is convenient for secondary use.

2. When the water enters the settling tank, the flocculating agent is added into the settling tank, the stirring mechanism is started to stir the water in the settling tank, the reaction of heavier impurities in the water in the settling tank and the flocculating agent is quickened, the water is precipitated to the bottom of the tank, the reaction efficiency is improved, the time is reduced, the precipitated substances contain metals and organic matters and can be recycled, meanwhile, the water in the settling tank enters the purifying tank through the third water suction pump, a clean water source is obtained through the filtration of the arranged activated carbon filter core plate, when the activated carbon filter core plate needs to be replaced, the two handles are pulled to drive the pull rods to move away from each other, the pull rods drive the two clamping blocks to move away from each other, the clamping blocks compress the second spring, the activated carbon filter core plate is convenient to replace, the operation is simple, and meanwhile, the first electric telescopic rod is started to drive the cleaning plate to move upwards, and the cleaning plate is used for cleaning the inner wall of the purifying tank, and the water source is prevented from being polluted by the attached scale for a long time.

Drawings

Fig. 1 is a schematic structural diagram of a municipal water conservancy project recycling device.

Fig. 2 is a schematic top view of a municipal hydraulic engineering recycling device.

Fig. 3 is a schematic cross-sectional structure of a filter box in the municipal water conservancy project recycling device.

Fig. 4 is an enlarged schematic view of the municipal water conservancy project recycling device shown at a in fig. 1.

Fig. 5 is an enlarged schematic view of the municipal water conservancy project recycling device shown at B in fig. 3.

In the figure: 1. a base; 2. a water collection tank; 201. a water inlet; 3. a large aperture grille; 301. a first slider; 302. a first chute; 4. a small aperture grille; 401. a second slider; 402. a second chute; 5. a blocking frame; 501. a third slider; 502. a third chute; 6. a first water pump; 7. a filter box; 701. an outlet; 8. a second water pump; 9. a sedimentation tank; 10. a stirring mechanism; 1001. a support plate; 1002. a motor; 1003. a rotating rod; 1004. a bearing; 1005. a stirring rod; 11. a third water pump; 12. a purifying box; 13. placing a frame; 1301. a through hole; 14. an active carbon filter core plate; 15. a cleaning mechanism; 1501. a support rod; 1502. a first electric telescopic rod; 1503. a cleaning plate; 16. a filter cloth frame; 17. a cleaning mechanism; 1701. a scraper; 1702. an electric slide rail; 1703. a through groove; 1704. a baffle; 1705. a telescopic rod; 1706. a first spring; 1707. a pushing block; 1708. a second electric telescopic rod; 18. a mounting mechanism; 1801. a mounting block; 1802. a clamping groove; 1803. a clamping block; 1804. a pull rod; 1805. a fixed block; 1806. a handle; 1807. and a second spring.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to fall within the scope of the utility model.

In the present utility model, the term "exemplary" is used to mean "serving as an example, instance, or illustration. Any embodiment described as "exemplary" in this disclosure is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is presented to enable any person skilled in the art to make and use the utility model. In the following description, details are set forth for purposes of explanation. It will be apparent to one of ordinary skill in the art that the present utility model may be practiced without these specific details. In other instances, well-known structures and processes have not been described in detail so as not to obscure the description of the utility model with unnecessary detail. Thus, the present utility model is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.

Examples

Referring to fig. 1 to 5, in an embodiment of the present utility model, a municipal hydraulic engineering recycling device includes a base 1, a cleaning mechanism 15 and a cleaning mechanism 17, a water collecting tank 2 is disposed at an upper end of the base 1, a water inlet 201 is disposed at a front end of the water collecting tank 2, a large aperture grille 3 is slidably connected in the water collecting tank 2, a small aperture grille 4 is disposed at a rear side of the large aperture grille 3, a blocking frame 5 is disposed at a rear side of the small aperture grille 4, a blocking net is disposed on the blocking frame 5, a right end of the water collecting tank 2 is communicated with a filter tank 7 through a first water pump 6, a filter cloth frame 16 is disposed in the filter tank 7, a filter cloth is disposed on the filter cloth frame 16, a cleaning mechanism 17 is disposed in the filter tank 7 corresponding to the filter cloth, a front end of the filter tank 7 is communicated with a sedimentation tank 9 through a second water pump 8, a stirring mechanism 10 is disposed in the sedimentation tank 9, a right end of the sedimentation tank 9 is communicated with a purifying tank 12 through a third water pump 11, a placement frame 13 is disposed in the purifying tank 12, a plurality of through holes 1301 are disposed on the placement frame 13, an activated carbon filter core 14 is disposed in the placement frame 13, a filter core plate 14 is disposed between the placement frame 13 and an activated carbon filter core plate is connected with the filter core 15 through a mounting mechanism 18.

The both ends are equipped with first slider 301 about the large aperture grid 3, first slider 301 and header tank 2 inner wall sliding connection, and header tank 2 inner wall corresponds first slider 301 and is equipped with first spout 302, both ends are equipped with second slider 401 about the aperture grid 4, and second slider 401 and header tank 2 inner wall sliding connection, header tank 2 inner wall correspond second slider 401 and are equipped with second spout 402, both ends are equipped with third slider 501 about block 5, third slider 501 and header tank 2 inner wall sliding connection, and header tank 2 inner wall corresponds third slider 501 and is equipped with third spout 502.

The stirring mechanism 10 comprises a supporting plate 1001, a motor 1002, a rotating rod 1003, a bearing 1004 and stirring rods 1005, wherein the supporting plate 1001 is arranged at the upper end of the settling tank 9, the motor 1002 is arranged at the upper end of the supporting plate 1001, the rotating rod 1003 penetrates through the supporting plate 1001, the bearing 1004 is arranged at the lower end of the rotating rod 1003, the lower end of the bearing 1004 is fixedly connected with the bottom end of the settling tank 9, and a plurality of stirring rods 1005 are arranged on the rotating rod 1003.

The cleaning mechanism 15 comprises a supporting rod 1501, a first electric telescopic rod 1502 and a cleaning plate 1503, the cleaning plate 1503 is attached to the bottom end of the cleaning box 12, the outer wall of the cleaning plate 1503 is attached to the inner wall of the cleaning box 12, the first electric telescopic rod 1502 is arranged at the upper end of the cleaning plate 1503, the supporting rod 1501 is arranged at the upper end of the first electric telescopic rod 1502, and the lower end of the supporting rod 1501 is fixedly connected with the base 1.

The cleaning mechanism 17 comprises a scraper 1701, an electric slide 1702, a through groove 1703, a baffle 1704, a telescopic rod 1705, a first spring 1706, a push block 1707 and a second electric telescopic rod 1708, wherein the scraper 1701 is attached to the upper end of the filter cloth frame 16, the scraper 1701 is in sliding connection with the filter cloth frame 16 through the electric slide 1702, and an outlet 701 is arranged at the right end of the filter box 7 corresponding to the filter cloth frame 16.

The filter cloth frame 16 is close to the one end of export 701 and is equipped with logical groove 1703, leads to the groove 1703 sliding connection baffle 1704, and the symmetry is equipped with telescopic link 1705 around the baffle 1704 lower extreme, telescopic link 1705 lower extreme passes through connecting block and filter tank 7 inner wall fixed connection, the cover has first spring 1706 on the telescopic link 1705, first spring 1706 upper end and baffle 1704 fixed connection, first spring 1706 lower extreme and connecting block fixed connection, the laminating of symmetry has ejector pad 1707 around the baffle 1704 upper end, and ejector pad 1707 upper end is equipped with second electric telescopic link 1708.

The installation mechanism 18 comprises an installation block 1801, a clamping groove 1802, clamping blocks 1803, a pull rod 1804, fixing blocks 1805, handles 1806 and second springs 1807, the installation block 1801 is symmetrically arranged at the left and right of the upper end of the active carbon filter core plate 14, the clamping grooves 1802 are arranged at one ends, far away from each other, of the installation blocks 1801, the clamping blocks 1803 are clamped in the clamping grooves 1802, the pull rods 1804 are arranged at one ends, far away from each other, of the clamping blocks 1803, the handles 1806 are arranged at the other ends of the pull rods 1804, the fixing blocks 1805 are connected to the pull rods 1804 in a sliding mode, the lower ends of the fixing blocks 1805 are fixedly connected with the purifying box 12, the second springs 1807 are sleeved on the pull rods 1804, one ends of the second springs 1807 are fixedly connected with the clamping blocks 1803, and the other ends of the second springs 1807 are fixedly connected with the fixing blocks 1805.

The working principle of the utility model is as follows:

when the utility model is used, wastewater is input into the water collection tank 2 through the water inlet 201, sequentially passes through the large-aperture grille 3, the small-aperture grille 4 and the blocking net frame 5 and then enters the filter tank 7 through the first water suction pump 6, larger sundries can be filtered through the arranged large-aperture grille 3, smaller sundries can be filtered through the small-aperture grille 4, the blocking net of the blocking net frame 5 is further filtered, sundries can be prevented from entering the filter tank 7, filtered water is further filtered through the filter cloth on the filter cloth frame 16 and then enters the sedimentation tank 9 through the second water suction pump 8, the electric slide rail 1702 is started to drive the scraper 1701 to move downwards during filtration, the scraper 1701 scrapes the soil on the filter cloth, the scraped soil is blocked by the baffle 1704, meanwhile, the scraper 1701 and the baffle 1704 can squeeze the soil to dehydrate, the waste of water resources is avoided, the second electric telescopic rod 8 is started to drive the push block 1707 to move downwards after extrusion, the pushing block 1707 drives the baffle 1704 to move downwards and simultaneously compresses the first spring 1706, dehydrated soil is discharged from the outlet 701, when water enters the settling tank 9, flocculant is added into the settling tank 9, the stirring mechanism 10 is started again to stir the water in the settling tank 9, the reaction of heavier impurities in the water in the settling tank 9 with the flocculant is quickened, the water is redeposited to the bottom of the tank, the reaction efficiency is improved, the time is shortened, meanwhile, the water in the settling tank 9 enters the purifying tank 12 through the third water suction pump 11, a clean water source is obtained through the filtration of the arranged activated carbon filter core 14, when the activated carbon filter core 14 needs to be replaced, the two handles 1806 are pulled to drive the pull rods 1804 to move away from each other, the pull rods 1804 drive the two clamping blocks 1803 to move away from each other, the clamping blocks 1803 compress the second spring 1807, and therefore the activated carbon filter core 14 is convenient to replace, the operation is simple, and simultaneously, the first electric telescopic rod 1502 is started to drive the cleaning plate 1503 to move upwards, so that the cleaning plate 1503 cleans the inner wall of the purifying box 12, and the inner wall of the purifying box 12 is prevented from polluting a water source by adhering scale for a long time.

The foregoing is only a preferred embodiment of the present utility model, but the scope of the present utility model is not limited thereto, and any person skilled in the art, who is within the scope of the present utility model, should make equivalent substitutions or modifications according to the technical scheme of the present utility model and the inventive concept thereof, and should be covered by the scope of the present utility model.

Claims (7)

1. The utility model provides a municipal water conservancy project cyclic utilization device, includes base (1), clearance mechanism (15) and clearance mechanism (17), its characterized in that, base (1) upper end is equipped with header tank (2), header tank (2) front end is equipped with water inlet (201), and interior sliding connection large aperture grid (3) of header tank (2), large aperture grid (3) rear side is equipped with small aperture grid (4), small aperture grid (4) rear side is equipped with block frame (5), be equipped with the block on block frame (5), header tank (2) right-hand member is equipped with filter cloth frame (16) through first suction pump (6) intercommunication rose box (7), be equipped with filter cloth frame (16) in rose box (7), be equipped with filter cloth on filter cloth frame (16), and correspond the filter cloth in rose box (7) and be equipped with clearance mechanism (17), be equipped with rabbling mechanism (10) in rose box (9) through second suction pump (8), be equipped with in rose box (9) the right-hand member through third suction pump (11) intercommunication rose box (12), be equipped with in rose box (12) and place in being equipped with filter frame (13) and place active carbon core (13) through-through hole (13) in being equipped with in filter frame (13), and a cleaning mechanism (15) is arranged at the rear side of the placement frame (13).

2. The municipal hydraulic engineering recycling device according to claim 1, wherein the cleaning mechanism (15) comprises a supporting rod (1501), a first electric telescopic rod (1502) and a cleaning plate (1503), the cleaning plate (1503) is attached to the bottom end of the cleaning box (12), the outer wall of the cleaning plate (1503) is attached to the inner wall of the cleaning box (12), the first electric telescopic rod (1502) is arranged at the upper end of the cleaning plate (1503), and the supporting rod (1501) fixedly connected with the base (1) is arranged at the upper end of the first electric telescopic rod (1502).

3. The municipal hydraulic engineering recycling device according to claim 1, wherein the cleaning mechanism (17) comprises a scraper (1701), an electric sliding rail (1702), a through groove (1703), a baffle plate (1704), a telescopic rod (1705), a first spring (1706), a push block (1707) and a second electric telescopic rod (1708), the scraper (1701) is attached to the upper end of the filter cloth frame (16), the scraper (1701) is in sliding connection with the filter cloth frame (16) through the electric sliding rail (1702), and an outlet (701) is formed in the right end of the filter box (7) corresponding to the filter cloth frame (16).

4. The municipal hydraulic engineering recycling device according to claim 3, wherein a through groove (1703) is formed in one end, close to the outlet (701), of the filter cloth frame (16), a baffle plate (1704) is connected in a sliding mode in the through groove (1703), telescopic rods (1705) are symmetrically arranged at the front and back of the lower end of the baffle plate (1704), the lower end of each telescopic rod (1705) is fixedly connected with the inner wall of the filter box (7) through a connecting block, a first spring (1706) is sleeved on each telescopic rod (1705), the upper end and the lower end of each first spring (1706) are fixedly connected with the baffle plate (1704) and the connecting block respectively, pushing blocks (1707) are symmetrically attached to the front and back of the upper end of each baffle plate (1704), and second electric telescopic rods (1708) are arranged at the upper end of each pushing block (1707).

5. The municipal hydraulic engineering recycling device according to claim 1, wherein the mounting mechanism (18) comprises a mounting block (1801), a clamping groove (1802), clamping blocks (1803), a pull rod (1804), a fixing block (1805), a handle (1806) and a second spring (1807), the mounting block (1801) is symmetrically arranged at the upper end of the activated carbon filter core plate (14), the clamping groove (1802) is arranged at one end, far away from each other, of the mounting block (1801), the clamping blocks (1803) are clamped in the clamping groove (1802), a pull rod (1804) is arranged at one end, far away from each other, of the two clamping blocks (1803), a handle (1806) is arranged at the other end of the pull rod (1804), the fixing block (1805) is connected to the fixing block (1805) in a sliding mode, the lower end of the fixing block (1805) is fixedly connected with the purifying box (12), the second spring (1807) is sleeved on the pull rod (1804), and two ends of the second spring (1807) are fixedly connected with the clamping blocks (1803) and the fixing block (5) respectively.

6. The municipal hydraulic engineering recycling device according to claim 1, wherein the stirring mechanism (10) comprises a supporting plate (1001), a motor (1002), a rotating rod (1003), a bearing (1004) and a stirring rod (1005), the supporting plate (1001) is arranged at the upper end of the settling tank (9), the motor (1002) is arranged at the upper end of the supporting plate (1001), the rotating rod (1003) penetrating through the supporting plate (1001) is arranged at the lower end of the motor (1002), the bearing (1004) fixedly connected with the bottom end of the settling tank (9) is arranged at the lower end of the rotating rod (1003), and a plurality of stirring rods (1005) are arranged on the rotating rod (1003).

7. The municipal hydraulic engineering recycling device according to claim 1, wherein the left end and the right end of the large-aperture grille (3), the small-aperture grille (4) and the blocking frame (5) are respectively provided with a first sliding block (301), a second sliding block (401) and a third sliding block (501), the inner wall of the water collecting tank (2) corresponds to the first sliding block (301), the second sliding block (401) and the third sliding block (501) and is respectively provided with a first sliding groove (302), a second sliding groove (402) and a third sliding groove (502), and the first sliding block (301), the second sliding block (401) and the third sliding block (501) are respectively in sliding connection with the first sliding groove (302), the second sliding groove (402) and the third sliding groove (502).