Wastewater treatment equipment for infrastructure construction sites

Abstract

This application relates to the technical field of wastewater treatment equipment, and discloses a wastewater treatment device for infrastructure construction sites to solve the problems of screen plate deformation caused by impacts from stones in wastewater and screen blockage by on-screen materials. By providing several screen holes on the side wall of the screening cylinder, a water collection ring with drainage holes is provided on the side wall of the screening cylinder. A retaining ring and a sealing block are fixed at the bottom of the screening cylinder. When wastewater flows into the screening cylinder, the stones in the wastewater first impact the wastewater in the screening cylinder, and the wastewater provides a certain buffer to prevent the stones from impacting the screening cylinder and avoiding deformation or damage. By setting the screening cylinder on a movable support slider, a conductor block I is provided on the support bar, a conductor block II is provided on the support slider, and an electromagnetic block is fixed in the middle of the support bar. The electromagnetic block, conductor block I, and conductor block II are electrically connected. A permanent magnet is embedded at the bottom of the sealing block. Impurities such as stones are removed through quality control, thereby achieving the purpose of periodic cleaning.

Description

Technical Field

[0001] This application relates to the field of wastewater treatment equipment technology, and more particularly to a wastewater treatment device for infrastructure construction sites. Background Technology

[0002] Wastewater generation is unavoidable during infrastructure construction. To protect the environment and safeguard worker health, effective treatment and disposal of this wastewater are necessary. Common wastewater treatment methods include physical, chemical, and biological methods, which must be selected and applied based on the type of wastewater and the concentration of pollutants. Wastewater treatment at infrastructure construction sites requires various devices, such as wastewater collection systems, pretreatment systems, fine filtration systems, and discharge systems.

[0003] During pretreatment, most existing pretreatment devices use sieve plates for filtration. However, during the process of wastewater flowing into the pretreatment device, large particles such as stones in the wastewater will impact the sieve plates, causing them to deform or be damaged. Furthermore, the accumulation of stones and other particles on the sieve plates requires periodic handling by workers, which not only consumes material and manpower resources but also clogs the sieve holes, greatly affecting the filtration efficiency of the sieve plates. Summary of the Invention

[0004] This application proposes a wastewater treatment device for infrastructure construction sites, which has the advantages of preventing the screen plate from being deformed by impact and automatically and periodically cleaning the material on the screen, in order to solve the problems of screen plate deformation caused by impact of stones in wastewater and screen blockage of screen holes by material on the screen.

[0005] To achieve the above objectives, this application adopts the following technical solution: a wastewater treatment device for a construction site, comprising a support leg, a screening cylinder, and an inlet pipe. The top of the support leg is provided with a plurality of support bars arranged in a circular array. Each support bar includes a horizontal bar and a vertical bar. The support bar is provided with: a sliding bar, fixedly installed on the upper end of the horizontal bar; a support slider, slidably installed on the upper end of the sliding bar; and a support spring, one end fixedly connected to the inner wall of the vertical bar of the support bar, and the other end fixedly connected to the outer wall of the support slider, with a groove at its top. A screening cylinder is provided above the support slider. The bottom end of the screening cylinder is inverted conical. The screening cylinder is provided with: an upper sliding bar, which is arranged in a ring array on the outer wall of the bottom end of the screening cylinder and slidably installed in the sliding groove at the top of the support slider; a discharge port, which is opened at the center of the bottom end of the screening cylinder; a retaining ring, which is fixedly installed in the discharge port; a blocking block, which is slidably installed in the retaining ring; a number of screen holes, which are arranged in an array on the side wall of the screening cylinder; a water collecting ring, which is fixedly sleeved on the lower part of the outer wall of the screening cylinder, and a drain hole is opened on one side of the water collecting ring; and a water inlet pipe, which is fixedly installed at the top of the screening cylinder.

[0006] Furthermore, a permanent magnet block is fixedly embedded at the bottom end of the sealing block; the support bar is provided with: an electromagnetic block, embedded at the connection of several support bars; a conductor block I, fixedly installed on the inner side of the vertical rod of one of the support bars; a conductor block II is fixedly installed on the outer wall of one of the support sliders, the conductor block I and the conductor block II are in the same support spring, and the conductor block I, the conductor block II and the electromagnetic block are electrically connected.

[0007] Furthermore, the water inlet pipe includes an outer pipe and an inner pipe. The inner pipe of the water inlet pipe is fixedly installed at the top of the screening cylinder. The outer pipe is slidably and sealingly sleeved on the outside of the inner pipe. A support rod is fixedly installed in the middle of the inner pipe. Baffles are provided on both sides of the support rod. The two baffles are connected by a connecting rope, and the connecting rope is attached to the top of the support rod.

[0008] Furthermore, the inner wall of the retaining ring is provided with helical teeth, and the side wall of the sealing block is used in conjunction with the helical teeth of the inner wall of the retaining ring.

[0009] Furthermore, the support spring is always in a compressed state.

[0010] Furthermore, when the electromagnetic block is energized, it generates a magnetic force that repels the permanent magnet block.

[0011] Furthermore, the support bar is also provided with: a mounting rod, one end of which is fixedly connected to the lower part of the side wall of the vertical rod of the support bar and points towards the vertical rod of the adjacent support bar; a support block, which is fixedly installed on the inner side of the other end of the mounting rod; a support shaft, both ends of which are fixedly connected to the adjacent support blocks; a pulley, which is movably sleeved in the middle of the support shaft; and a striking strip, which is arranged in a circular array at both ends of the pulley and is elastic and can be bent and deformed; and a number of steel wire ropes are fixedly connected to the permanent magnet block at the bottom of the sealing block, the steel wire ropes passing through the pulley and being wound around the pulley several times.

[0012] Furthermore, the screening cylinder is also provided with: an upper edge, fixedly sleeved on the top of the outer side of the screening cylinder; a blockage clearing device, movably sleeved on the outer side of the screening cylinder, the blockage clearing device including: a connecting spring, arranged in a ring array connected to the bottom end of the upper edge; a slip ring, fixedly connected to the bottom end of the connecting spring; a connecting rod, arranged in a ring array at the bottom end of the slip ring, the bottom end connected to the same slip ring, and the connecting rod is located on the outer wall between two screen holes; a moving bar, equidistantly arranged on the connecting rod; a blockage clearing block, fixedly installed at both ends of the inner wall of the moving bar, and having elasticity and bendability; a plurality of connecting pipes are fixedly installed inside the water collecting ring, and the connecting pipes pass through the water collecting ring; one end of the steel wire rope passing through the pulley passes through the connecting pipe and is fixedly connected to the slip ring at the bottom end of the blockage clearing device.

[0013] Furthermore, the length of the moving strip is equal to the distance between two transverse sieve holes, and the distance between the moving strips in the longitudinal direction is the same as the distance between the sieve holes in the longitudinal direction.

[0014] This application has the following beneficial effects:

[0015] 1. This application provides a wastewater treatment device for a construction site of an infrastructure project. The bottom of a screening cylinder is designed as an inverted cone shape, with several screen holes on its side wall. A water collection ring is fixedly fitted onto the lower part of the side wall of the screening cylinder, and a drain hole is provided on one side of the water collection ring. A retaining ring is fixedly installed in the middle of the bottom of the screening cylinder, and a sealing block is slidably installed inside the retaining ring. A water inlet pipe is fixedly installed in the middle of the top of the screening cylinder. During operation, wastewater is flushed into the screening cylinder through the water inlet pipe, and the height of the wastewater in the screening cylinder gradually increases until it overflows the screen holes for screening. When subsequent wastewater and stones in the wastewater are added to the screening cylinder, the stones first impact the wastewater in the screening cylinder. The wastewater in the screening cylinder provides a certain buffer for the stones, preventing the stones in the wastewater from impacting the screening cylinder and causing deformation or damage.

[0016] 2. This application provides a wastewater treatment device for a construction site of an infrastructure project. A lower sliding bar is fixed to the crossbar of a support bar, and an upper sliding bar is fixed to the bottom of the screening cylinder. Support sliders slide on the lower and upper sliding bars. A support spring is fixedly connected to the outer wall of the support slider, and the other end of the support spring is fixedly connected to the vertical bar of the support bar. A conductor block I is located on one of the vertical bars of the support bar, and a conductor block II is located on the outer wall of one of the support sliders. Conductor block I and conductor block II are located within the same support spring. An electromagnetic block is fixedly located in the middle of the support bar. The electromagnetic block, conductor block I, and conductor block II are electrically connected. A permanent magnet is fixedly embedded at the bottom of the sealing block. During operation, the wastewater in the screening cylinder... When the wastewater reaches the minimum screen opening, the support slider is supported by the support spring and will not move outward. After one stage of screening, the number of stones in the screening cylinder gradually increases. Since the density of the stones is greater than that of the wastewater, the gravity in the screening cylinder will increase, causing the screening cylinder to squeeze the support slider at the bottom of the screening cylinder. This causes the support slider to overcome the elastic force of the support spring and move outward until the conductor block II of the support slider contacts the conductor block I, energizing the electromagnetic block. The electromagnetic block generates a repulsive force with the permanent magnet block, causing the permanent magnet block to move the sealing block upward, thereby opening the discharge port and allowing the stones and other impurities in the screening cylinder to be discharged. By controlling the quality of the stones and other impurities, the purpose of periodic cleaning is achieved.

[0017] 3. This application provides a wastewater treatment device for a construction site of an infrastructure project. An installation rod is provided between two adjacent support bars, with a support block in the middle of the installation rod. A support shaft and pulley are provided between the two support blocks. A striking bar is arranged in an outer annular array on the pulley. A block-clearing device is provided on the outside of the screening cylinder. A steel wire rope is fixedly connected to the bottom end of the blocking block. The steel wire rope passes around the pulley, and its other end is fixedly connected to the bottom end of the block-clearing device. When the blocking block moves upward to discharge stones and other impurities from the screening cylinder, a permanent magnet pulls the steel wire rope, causing the steel wire rope to rotate. The rotating pulley drives the striking bar to strike the side wall at the bottom of the screening cylinder, causing the side wall of the screening cylinder to vibrate and dislodge impurities, preventing them from adhering to the side wall at the bottom of the screening cylinder. Simultaneously, the block-clearing device is pulled downward, allowing its block-clearing block to enter the screen holes and clean them, preventing blockage. Attached Figure Description

[0018] The accompanying drawings, which form part of this specification, illustrate embodiments disclosed in this application and, together with the specification, serve to explain the principles disclosed in this application.

[0019] This disclosure will become clearer with reference to the accompanying drawings and the following detailed description, wherein:

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0021] Figure 2 This is a schematic diagram of the structure of the present invention without the supporting legs;

[0022] Figure 3 This is a cross-sectional view of the present invention;

[0023] Figure 4 For the present invention Figure 3 Enlarged view of the local structure at point A;

[0024] Figure 5 This is a bottom view of the present invention;

[0025] Figure 6 This is a schematic diagram of the unblocking device of the present invention.

[0026] In the diagram: 1. Support leg; 2. Support bar; 201. Sliding bar; 202. Conductor block I; 203. Electromagnetic block; 204. Mounting rod; 205. Support block; 206. Support shaft; 207. Pulley; 208. Striking bar; 3. Support slider; 301. Conductor block II; 4. Support spring; 5. Screening cylinder; 501. Upper sliding bar; 502. Screen hole; 503. Water collecting ring; 504. Drain hole; 505. Upper edge; 506. Connecting pipe; 507. Retaining ring; 508. Blocking block; 509. Permanent magnet block; 6. Water inlet pipe; 601. Baffle; 7. Unblocking device; 701. Connecting spring; 702. Slip ring; 703. Connecting rod; 704. Moving bar; 705. Unblocking block; 8. Steel wire rope. Detailed Implementation

[0027] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application. Example 1

[0028] Please see Figures 1-4 A wastewater treatment device for a construction site includes a support leg 1, a support bar 2, a screening cylinder 5, and an inlet pipe 6. The top of the support leg 1 is provided with a plurality of support bars 2 arranged in an annular array. The support bars 2 are L-shaped. The horizontal bar of the support bar 2 is fixedly installed at the top of the outer wall of the support leg 1. The vertical bar of the support bar 2 supports the upper end of the outer wall of the support leg 1. The upper end of the horizontal bar of the support bar 2 is fixedly installed with a sliding bar 201. The upper end of the sliding bar 201 is slidably installed with a support slider 3. The support slider 3 can only slide along the direction of the sliding bar 201. The inner wall of the vertical bar of the support bar 2 is fixedly connected with a support spring 4. The other end of the support spring 4 is fixedly connected to the outer wall of the support slider 3. The upper end of the support slider 3 is provided with a screening cylinder 5. The bottom end of the screening cylinder 5 is inverted conical. The outer wall of the bottom end of the screening cylinder 5 is provided with a plurality of upper sliding bars 501 arranged in an annular array. The top end of the support slider 3 is provided with a sliding groove. The upper sliding bars 501 of the screening cylinder 5 are slidably installed in the sliding groove at the top end of the support slider 3.

[0029] A discharge port is provided at the center of the bottom end of the screening cylinder 5. A retaining ring 507 is fixedly installed inside the discharge port. The retaining ring 507 has an L-shaped cross section. A sealing block 508 is slidably provided inside the retaining ring 507. The top of the sealing block 508 is conical. A permanent magnet block 509 is fixedly embedded at the bottom end of the sealing block 508. Electromagnetic blocks 203 are embedded at the connection of several support bars 2. A conductor block I 202 is fixedly installed on the inner side of the vertical rod of one of the support bars 2. A conductor block II 301 is fixedly installed on the outer wall of one of the support sliders 3. The conductor block I 202 and the conductor block II 301 are located in the same support spring 4 and are insulated from each other. The conductor block I 202, the conductor block II 301 and the electromagnetic block 203 are electrically connected.

[0030] Please see Figures 1-4 The side wall of the screening cylinder 5 is provided with a number of screen holes 502. A water collection ring 503 is fixedly sleeved on the lower part of the outer wall of the screening cylinder 5. The water collection ring 503 is sealed to the side wall of the screening cylinder 5. A drain hole 504 for drainage is provided on one side of the water collection ring 503. A water inlet pipe 6 is fixedly installed at the top of the screening cylinder 5. The water inlet pipe 6 is connected to the screening cylinder 5.

[0031] Please see Figure 3 The inlet pipe 6 includes an outer pipe and an inner pipe. The inner pipe of the inlet pipe 6 is fixedly installed at the top of the screening cylinder 5. The outer pipe is slidably and sealingly fitted on the outside of the inner pipe. A support rod is fixedly installed in the middle of the inner pipe. Baffles 601 are provided on both sides of the support rod. The two baffles 601 do not obstruct the connection between the outer pipe and the inner pipe. The two baffles 601 are connected by a connecting rope, which is attached to the top of the support rod. When the inner pipe moves down with the screening cylinder 5, the baffles 601 will gradually block the connection between the inner pipe and the outer pipe until it is completely blocked.

[0032] The inner wall of the retaining ring 507 is provided with helical teeth, and the side wall of the sealing block 508 cooperates with the helical teeth on the inner wall of the retaining ring 507. When the sealing block 508 moves up or down, the side wall of the sealing block 508 and the helical teeth on the inner wall of the retaining ring 507 move relative to each other. The helical teeth on the inner wall of the retaining ring 507 cause the sealing block 508 to vibrate, thereby shaking off stones and other impurities on the upper side of the sealing block 508 and preventing impurities from adhering to the upper end of the sealing block 508.

[0033] The support spring 4 is always in a compressed state. The support spring 4 generates a supporting force on the support slider 3, preventing the support slider 3 from being squeezed by the gravity of the screening cylinder 5, so that the support slider 3 overcomes the elastic force of the support spring 4 and moves outward along the lower slide bar 201 and the upper slide bar 501; and when the wastewater in the screening cylinder 5 overflows the lowest screen hole 502, the elastic force of the support spring 4 is equal to the force of the screening cylinder 5 pushing the support slider 3 to move outward.

[0034] When the electromagnetic block 203 is energized, it generates a magnetic force that repels the permanent magnet block 509. As the number of stones and other impurities increases in the screening cylinder 5, the weight of these impurities causes the screening cylinder 5 to press against the support slider 3. This causes the support slider 3 to overcome the elastic force of the support spring 4 and move outward along the lower slide bar 201 and the upper slide bar 501. When the conductor block I 202 contacts the conductor block II 301, it indicates that the impurities in the screening cylinder 5 have reached a certain quantity. At this time, the electromagnetic block 203 generates a magnetic force that repels the permanent magnet block 509. The permanent magnet block 509 then moves the sealing block 508 upward, thereby opening the discharge port and allowing the stones and other impurities in the screening cylinder 5 to be discharged.

[0035] The working principle of Embodiment 1 of the present invention is as follows:

[0036] Before use, the outer pipe of the inlet pipe 6 is fixedly installed on the pipe through which the wastewater flows.

[0037] Please see Figures 1-5 During operation, wastewater is introduced into the screening cylinder 5 through the inlet pipe 6. The height of the wastewater in the screening cylinder 5 gradually increases. The wastewater must overflow the lowest screen hole 502 before screening can be carried out. When subsequent wastewater and stones in the wastewater are put into the screening cylinder 5, the stones first hit the wastewater in the screening cylinder 5. The wastewater in the screening cylinder 5 provides a certain buffer for the stones, preventing the stones in the wastewater from hitting the screening cylinder 5 and causing the screening cylinder 5 to deform or break.

[0038] As wastewater flows from the inlet pipe 6 into the screening cylinder 5, the height of the wastewater in the screening cylinder 5 gradually increases until it reaches the lowest screen opening 502. During this process, the support slider 3 is supported by the support spring 4 and will not move outward. After screening for a period of time, impurities such as stones gradually increase in the screening cylinder 5. Since the density of stones is greater than that of wastewater, the gravity inside the screening cylinder 5 increases, resulting in increased pressure on the support slider 3 at the bottom of the screening cylinder 5. The squeezing force of the support slider 3 causes it to move outward against the elastic force of the support spring 4. When the mass of stones and other impurities in the screening cylinder 5 reaches a certain level, the conductor block II 301 of the support slider 3 contacts the conductor block I 202, which energizes the electromagnetic block 203. The electromagnetic block 203 generates a repulsive force with the permanent magnet block 509, causing the permanent magnet block 509 to move the sealing block 508 upward, thereby opening the drain port and allowing the stones and other impurities in the screening cylinder 5 to be discharged. By controlling the mass of stones and other impurities in the screening cylinder 5, the purpose of periodic cleaning is achieved. Example 2

[0039] Example 2 is a further improvement based on Example 1.

[0040] Unlike Example 1, please refer to Figures 1-4A mounting rod 204 is fixedly connected to the lower side wall of the vertical rod of the support bar 2. The mounting rod 204 points to the vertical rod of the adjacent support bar 2. A support block 205 is fixedly installed on the inner side of the other end of the mounting rod 204. A support shaft 206 is fixedly provided between two adjacent support blocks 205. The two ends of the support shaft 206 are fixedly connected to the adjacent support blocks 205 respectively. A pulley 207 is movably sleeved in the middle position of the support shaft 206. Several striking strips 208 are arranged in a circular array at both ends of the pulley 207. The striking strips 208 have a certain elasticity and can be bent and deformed. Several steel wire ropes 8 are fixedly connected to the permanent magnet block 509 at the bottom of the sealing block 508. The steel wire ropes 8 pass through the pulley 207 and are wound around the pulley 207 several times.

[0041] Please see Figures 1-6 The top of the outer side of the screening cylinder 5 is fixedly fitted with an upper edge 505. A clearing device 7 is movably fitted on the outer side of the screening cylinder 5. The clearing device 7 includes a connecting spring 701, a slip ring 702, a connecting rod 703, a moving bar 704, and a clearing block 705. The connecting springs 701 are arranged in a ring array connected to the bottom end of the upper edge 505. The bottom end of the connecting springs 701 is fixedly connected to the same slip ring 702. Several connecting rods 703 are arranged in a ring array at the bottom end of the slip ring 702, and the connecting rods 703 are located between two screen holes 5. On the outer wall between 02, several movable strips 704 are equidistantly arranged on the connecting rod 703. The two ends of the inner wall of the movable strip 704 are fixedly installed with unblocking blocks 705. The unblocking blocks 705 have a certain elasticity and can be bent and deformed. The bottom end of the connecting rod 703 is fixedly connected to another slip ring 702. Several connecting pipes 506 are fixedly installed inside the water collecting ring 503, and the connecting pipes 506 pass through the water collecting ring 503. One end of the steel wire rope 8 passing through the pulley 207 passes through the connecting pipe 506 and is fixedly connected to the slip ring 702 at the bottom.

[0042] The length of the moving bar 704 is equal to the distance between the two transverse screen holes 502, and the distance between the moving bars 704 in the longitudinal direction is the same as the distance between the screen holes 502 in the longitudinal direction. This ensures that when the unblocking device 7 moves, the unblocking blocks 705 of the unblocking device 7 can enter the screen holes 502 to clean them.

[0043] As impurities such as stones increase inside the screening cylinder 5, the screening cylinder 5 descends. The screening cylinder 5 pushes the support slider 3 to move outward, and when the conductor block II 301 of the support slider 3 contacts the conductor block I 202, the striking bar 208 can contact the conical sidewall at the bottom of the screening cylinder 5.

[0044] The working principle of Embodiment 2 of the present invention is as follows:

[0045] Please see Figure 1-6During operation, after screening in the screening cylinder 5 for a period of time, the amount of impurities such as stones gradually increases. Since the density of stones is greater than that of wastewater, the gravity inside the screening cylinder 5 increases, which in turn increases the squeezing force of the screening cylinder 5 on the bottom support slider 3. At this time, the squeezing force of the screening cylinder 5 on the support slider 3 causes the support slider 3 to overcome the elastic force of the support spring 4 and move outward. When the mass of impurities such as stones in the screening cylinder 5 reaches a certain level, the conductor block II 301 of the support slider 3 contacts the conductor block I 202. When the electromagnetic block 203 is energized, it generates a repulsive force against the permanent magnet block 509, causing the permanent magnet block 509 to move the sealing block 508 upward. At the same time, the permanent magnet block 509 pulls the steel wire rope 8 to move, which in turn drives the pulley 207 to rotate. The rotating pulley 207 drives the striking bar 208 to rotate, causing the striking bar 208 to strike the side wall at the bottom of the screening cylinder 5, thereby vibrating the conical wall at the bottom of the screening cylinder 5. This causes stones and other impurities on the inner wall of the screening cylinder 5 to vibrate and slide off, preventing impurities from adhering to the side wall at the bottom of the screening cylinder 5.

[0046] As the permanent magnet 509 moves the sealing block 508 upward, and the permanent magnet 509 pulls the steel wire rope 8 to move, the other end of the steel wire rope 8 pulls the unblocking device 7 downward, so that the unblocking block 705 of the unblocking device 7 is inserted into the screen hole 502, thereby cleaning the impurities accumulated in the screen hole 502 and preventing impurities from clogging the screen hole 502.

Claims

1. A wastewater treatment apparatus for a construction site of a capital construction project, comprising a support leg (1), a screening drum (5), and a water inlet pipe (6), characterized in that: The top of the support leg (1) is provided with a plurality of support bars (2) arranged in a circular array. The support bars (2) include horizontal bars and vertical bars, and the support bars (2) are provided with: The sliding bar (201) is fixedly installed at the upper end of the crossbar of the support bar (2); The support slider (3) is slidably mounted on the upper end of the lower bar (201); The support spring (4) is fixedly connected at one end to the inner wall of the vertical rod of the support bar (2), and at the other end to the outer wall of the support slider (3), and a groove is provided at the top. A screening cylinder (5) is provided above the supporting slider (3). The bottom end of the screening cylinder (5) is inverted conical. The screening cylinder (5) is provided with: The upper slide bar (501) is arranged in a ring array on the outer wall of the bottom end of the screening cylinder (5) and is slidably installed in the groove at the top of the supporting slider (3); The discharge port is located at the center of the bottom end of the screening cylinder (5); The retaining ring (507) is fixedly installed inside the waste discharge port; The sealing block (508) is slidably disposed within the retaining ring (507); A number of sieve holes (502) are arrayed on the side wall of the sieve cylinder (5); A water collection ring (503) is fixedly sleeved on the lower part of the outer wall of the screening cylinder (5), and a drainage hole (504) is provided on one side of the water collection ring (503). The water inlet pipe (6) is fixedly installed at the top of the screening cylinder (5); A permanent magnet block (509) is fixedly embedded at the bottom end of the sealing block (508). The support bar (2) is provided with: Electromagnetic block (203) is embedded in the connection of several support bars (2); Conductor block I (202) is fixedly installed on the inside of the vertical rod of one of the support bars (2); One of the supporting sliders (3) has a conductor block II (301) fixedly installed on its outer wall. The conductor block I (202) and the conductor block II (301) are located in the same supporting spring (4). The conductor block I (202), the conductor block II (301) and the electromagnetic block (203) are electrically connected. Several steel wire ropes (8) are fixedly connected to the permanent magnet block (509) at the bottom of the sealing block (508). The screening cylinder (5) is also equipped with: The upper edge (505) is fixedly sleeved on the top of the outer side of the screening cylinder (5); A blockage-clearing device (7) is movably sleeved on the outside of the screening cylinder (5), and the blockage-clearing device (7) includes: A connecting spring (701) is connected in a ring array to the bottom end of the upper edge (505); The slip ring (702) is fixedly connected to the bottom end of the connecting spring (701); The connecting rod (703) is arranged in a ring array at the bottom end of the slip ring (702), and the bottom end is connected to the same slip ring (702). The connecting rod (703) is located on the outer wall between the two sieve holes (502). Movable bars (704) are equidistantly arranged on connecting rods (703); The unblocking block (705) is fixedly installed at both ends of the inner wall of the movable strip (704) and is elastic and can be bent and deformed; Several connecting pipes (506) are fixedly installed inside the water collection ring (503), and the connecting pipes (506) pass through the water collection ring (503); one end of the wire rope (8) passes through the connecting pipe (506) and is fixedly connected to the slip ring (702) at the bottom of the unblocking device (7).

2. The wastewater treatment apparatus for a construction site of a capital construction project according to claim 1, characterized by The water inlet pipe (6) includes an outer pipe and an inner pipe. The inner pipe of the water inlet pipe (6) is fixedly installed at the top of the screening cylinder (5). The outer pipe is slidably sealed on the outside of the inner pipe. A support rod is fixedly installed in the middle of the inner pipe. Baffles (601) are provided on both sides of the support rod. The two baffles (601) are connected by a connecting rope, and the connecting rope is attached to the top of the support rod.

3. The wastewater treatment apparatus for a construction site of a capital construction project according to claim 1, characterized by The inner wall of the retaining ring (507) is provided with oblique teeth, and the side wall of the sealing block (508) is used in conjunction with the oblique teeth of the inner wall of the retaining ring (507).

4. The wastewater treatment apparatus for a construction site of a capital construction project according to claim 1, characterized by The support spring (4) is always in a compressed state.

5. The wastewater treatment apparatus for a construction site of a capital construction project according to claim 1, characterized by When the electromagnetic block (203) is energized, it generates a magnetic force that repels the permanent magnet block (509).

6. The wastewater treatment apparatus for a construction site of a capital construction project according to claim 1, characterized by The support bar (2) is also provided with: The mounting rod (204) is fixedly connected at one end to the lower part of the side wall of the vertical rod of the support bar (2) and points to the vertical rod of the adjacent support bar (2); The support block (205) is fixedly installed on the inner side of the other end of the mounting rod (204); The support shaft (206) is fixedly connected at both ends to the adjacent support blocks (205); The pulley (207) is movably sleeved in the middle position of the support shaft (206); The striking bar (208) is arranged in a ring array at both ends of the pulley (207) and is elastic and can be bent and deformed; The wire rope (8) passes through the pulley (207) and is wound several times on the pulley (207).

7. The wastewater treatment apparatus for a construction site of a capital construction project according to claim 1, characterized by The length of the moving strip (704) is equal to the distance between the two transverse sieve holes (502), and the distance between the moving strips (704) in the longitudinal direction is the same as the distance between the sieve holes (502) in the longitudinal direction.

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