Dual traction two-stage grating machine

Abstract

The application provides a double-drawing two-stage grating machine, which comprises front and rear distributed fine grating devices and coarse grating devices; the fine grating devices and the coarse grating devices are both provided with rake hoppers with the same structure; the double-drawing two-stage grating machine further comprises a chain driving device; the chain driving device comprises a mounting frame, a motor, gears, transmission shafts, coarse grating sprockets, coarse grating chains, fine grating sprockets and fine grating chains; two transmission shafts are arranged on the mounting frame through shaft seats and are distributed front and rear; two gears are arranged on one end of the two transmission shafts respectively; the two gears are engaged with each other; the power output end of the motor is connected with one of the transmission shafts; two coarse grating sprockets are arranged on the front transmission shaft and are distributed left and right; the coarse grating chains and the fine grating chains are respectively connected with the coarse grating sprockets and the fine grating sprockets; one end of the chains is connected with the rake hoppers, and the other end is connected with weights; the design can control two groups of grating devices to work synchronously through one group of chain driving devices, saves cost and has high efficiency.

Description

Technical Field

[0001] This invention relates to the field of bar screen machines, and particularly to a dual-traction two-stage bar screen machine. Background Technology

[0002] Currently, most bar screens use steel cables to drive the rake buckets, controlling their up and down movement. However, using steel cables can easily cause the cables to tangle, leading to abnormal cable retraction and deployment. To achieve the desired cleaning effect, a two-stage bar screen is actually used for filtration. Wastewater first passes through a coarse bar for preliminary filtration, and then through a fine bar for further filtration of fine impurities. In the past, two separate bar screens were installed and operated independently, with each bar screen's chain drive controlling its rake buckets to move up and down to collect the filter residue, which resulted in relatively high costs. Summary of the Invention

[0003] The purpose of this invention is to provide a dual-traction two-stage bar screen machine to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A dual-traction two-stage bar screen machine includes a fine bar screen device and a coarse bar screen device distributed front and rear; both the fine bar screen device and the coarse bar screen device are equipped with rakes of the same structure; it also includes a chain drive device; the chain drive device includes a mounting frame, a motor, gears, a drive shaft, a coarse bar screen sprocket, a coarse bar screen chain, a fine bar screen sprocket, and a fine bar screen chain; two drive shafts are provided and are distributed front and rear on the mounting frame via bearing seats; two gears are provided and are respectively installed at one end of the two drive shafts; the two gears mesh with each other; the power output end of the motor is connected to one of the drive shafts. The drive shaft is connected to the coarse screen sprockets, which are arranged on the left and right sides and mounted on the front drive shaft. Two coarse screen chains are arranged and are respectively connected to the coarse screen sprockets. One end of each coarse screen chain is fixed with a first counterweight and hangs down naturally, while the other end is connected to the rake bucket of the coarse screen device. Two fine screen sprockets are arranged on the left and right sides and mounted on the rear drive shaft. Two fine screen chains are arranged and are respectively connected to the fine screen sprockets. One end of each fine screen chain is fixed with a second counterweight and hangs down naturally, while the other end is connected to the rake bucket of the fine screen device.

[0006] In a further description of the present invention, both the fine screen device and the coarse screen device further include a screen and a chute; the screen is provided with an upper and lower track device; the chute is located on the front side of the upper part of the screen; and the rake bucket can move on the upper and lower track device.

[0007] Further description of the invention: the bucket includes a bucket box, a heavy hammer slag remover, lifting arms, an upper wheel, and a lower wheel; the front side of the bucket box is an arc surface; the front side of the bucket box includes an arc-shaped fixed plate and a movable arc-shaped grid; the arc-shaped fixed plate is integrally formed on the lower front of the bucket box; the movable arc-shaped grid is rotatably connected to the upper part of the arc-shaped fixed plate via a hinge; a limiting block is provided above the bucket for limiting the swing angle of the movable arc-shaped grid; two lifting arms are provided and movably connected to the left and right sides of the bucket box; a connecting shaft is provided on the upper rear of the bucket box; the upper end of the heavy hammer slag remover is rotatably connected to the connecting shaft, and the lower end contacts the bottom surface inside the bucket box; the upper wheel and the lower wheel are arranged vertically and installed on the left and right sides in front of the bucket box; a stop block is installed on the upper end of the upper and lower track device; the coarse grid chain and the fine grid chain are respectively connected to the lifting arms of the corresponding buckets.

[0008] Further description of the invention: the outer diameter of the lower wheel is larger than the outer diameter of the upper wheel; the upper and lower track device includes an upper guide rail, a lower guide rail, an upper wheel return guide rail, a lower wheel return guide rail, and a guide rail converter; both the upper and lower guide rails are mounted on the grid; the upper end of the lower guide rail is connected to the middle of the upper guide rail via the guide rail converter; the upper wheel return guide rail is connected to the lower end of the lower guide rail; a first notch for the upper wheel to pass through is provided between the upper wheel return guide rail and the upper guide rail; the lower wheel return guide rail is fixed on the grid and located below the upper wheel return guide rail; a second notch is reserved between the lower wheel return guide rail and the lower guide rail; the gap of the second notch is smaller than the outer diameter of the lower wheel and larger than the outer diameter of the upper wheel; a third notch for the lower wheel to pass through is provided between the lower wheel return guide rail and the upper guide rail.

[0009] In a further description of the present invention, the guide rail converter includes a movable guide rail and a resetter; the movable guide rail is movably connected to the grid via a connecting frame and is located at the upper end of the lower guide rail; the resetter includes a third weight, a connecting member, and a roller; the middle part of the connecting member is rotatably connected to the grid; the third weight is fixed to one end of the connecting member; the roller is connected to the other end of the connecting member and contacts the lower front part of the movable guide rail; the third weight pulls the connecting member by gravity, causing the roller to contact the movable guide rail, so that the upper end of the movable guide rail aligns with the middle part of the upper guide rail, and the lower end aligns with the upper end of the lower guide rail.

[0010] In a further description of the present invention, the stop block is fixed to the upper end of the upper guide rail; the stop block includes a vertical plate connected to the upper end of the upper guide rail and a horizontal plate connected to the rear side of the upper end of the horizontal plate; the vertical plate and the horizontal plate form an inverted "L" shape structure.

[0011] In a further description of the present invention, the lower part of the grille is equipped with slag-retaining teeth; the movable arc-shaped grille is staggered with the slag-retaining teeth and can pass through the position of the slag-retaining teeth.

[0012] In a further description of the present invention, the left and right side walls of the bucket box are respectively provided with strip-shaped holes; the lower end of the lifting arm is connected to the strip-shaped holes through a wheel axle, and the upper end is provided with mounting holes for fixing the chain.

[0013] As further described in the present invention, the arc-shaped fixing plate is provided with a plurality of filter holes.

[0014] As further described in the present invention, brackets are installed on the left and right sides of the upper rear of the bucket; the connecting shaft is installed between the two brackets.

[0015] The beneficial effects of this invention are as follows:

[0016] In this design, a motor drives a transmission shaft to rotate. Gears on the two transmission shafts mesh with each other, causing the two transmission shafts to rotate synchronously in opposite directions. The two transmission shafts drive the coarse and fine screen sprockets connected to them to move synchronously. The coarse screen sprocket drives the coarse screen chain to move, thereby pulling the rake bucket of the coarse screen device up and down. The fine screen sprocket drives the fine screen chain to move, thereby pulling the rake bucket of the fine screen device up and down. This controls the synchronous up and down movement of the two sets of rake buckets. This design only requires one chain drive device to stably control the synchronous up and down movement of the rake buckets of the two screen devices. It is low in cost, easy to control, and the chain drive will not cause tangling or knotting, improving the stability of the rake bucket transportation. Attached Figure Description

[0017] Figure 1 This is a structural diagram of the present invention after the rake bucket has descended;

[0018] Figure 2 This is a structural diagram of the present invention after the rake bucket moves upward and flips over;

[0019] Figure 3 yes Figure 2 A partial structural side view;

[0020] Figure 4 This is a structural diagram of the rake bucket of the present invention; (the dotted line indicates the position of the movable arc-shaped grid after it swings).

[0021] Figure 5 yes Figure 4 Side view;

[0022] Figure 6 This is a schematic diagram of the guide rail converter, upper guide rail, and lower guide rail of the present invention;

[0023] Figure 7 This is a structural diagram of the stop block of the present invention. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings:

[0025] like Figure 1-7 As shown, a dual-traction two-stage bar screen includes a fine bar screen device 1 and a coarse bar screen device 2 distributed front to back; both the fine bar screen device 1 and the coarse bar screen device 2 are equipped with rake buckets 3 with identical structures; it also includes a chain drive device 4; the chain drive device 4 is located between the coarse bar screen device 2 and the fine bar screen device 1, and includes a mounting frame 41, a motor 42, a gear 43, a drive shaft 44, a coarse bar screen sprocket 45, a coarse bar screen chain 46, a fine bar screen sprocket 47, and a fine bar screen chain 48; two drive shafts 44 are provided and installed front to back through bearing seats. On the mounting bracket 41; two gears 43 are provided and respectively installed on one end of two drive shafts 44; the two gears 43 mesh with each other; the power output end of the motor 42 is connected to one of the drive shafts 44, and the motor 42 can be fixed on the mounting bracket 41 or on an external frame; two coarse grid sprockets 45 are provided and distributed on the left and right sides of the front drive shaft 44; two coarse grid chains 46 are provided and respectively connected to the coarse grid sprockets 45; one end of the coarse grid chain 46 is fixed with a first counterweight and hangs down naturally, and the other end is connected to the coarse grid device. The rake bucket 3 of device 2 is connected; two fine grid sprockets 47 are provided and distributed on the left and right sides of the drive shaft 44 at the rear; two fine grid chains 48 are provided and are respectively connected to the fine grid sprockets 47; one end of the fine grid chain 48 is fixed with a second weight and hangs down naturally, and the other end is connected to the rake bucket 3 of the fine grid device 1; in this design, a motor 42 drives a drive shaft 44 to rotate, and the gears 43 on the two drive shafts 44 mesh with each other to drive the two drive shafts 44 to rotate synchronously in opposite directions, and the two drive shafts 44 drive the coarse grid sprocket 4 connected to them. 5. The fine grid sprocket 47 moves synchronously, and the coarse grid sprocket 45 drives the coarse grid chain 46 to move, thereby pulling the rake bucket 3 of the coarse grid device 2 to move up and down. The fine grid sprocket 47 drives the fine grid chain 48 to move, thereby pulling the rake bucket 3 of the fine grid device 1 to move up and down. This controls the synchronous up and down movement of the two sets of rake buckets 3. This design only needs one chain drive device 4 to stably control the synchronous up and down movement of the rake buckets 3 of the two sets of grid devices 5. It is low in cost, easy to control, and the chain drive will not cause tangling or knotting, thus improving the stability of the rake bucket transportation.

[0026] Both the fine screen device 1 and the coarse screen device 2 further include a screen 5 and a chute 6; the screen 5 is provided with an upper and lower track device 7; the chute 6 is located on the front side of the upper part of the screen 5; the rake 3 can move on the upper and lower track device 7.

[0027] The bucket 3 includes a bucket box 31, a heavy hammer slag remover 32, a lifting arm 33, an upper wheel 34, and a lower wheel 35. The front side of the bucket box 31 is an arc surface. The front side of the bucket box 31 includes an arc-shaped fixed plate 311 and a movable arc-shaped grid 312. The arc-shaped fixed plate 311 is integrally formed on the lower front of the bucket box 31. The movable arc-shaped grid 312 is rotatably connected to the upper part of the arc-shaped fixed plate 311 via a door hinge 3121. A limiting block 3122 is provided above the bucket 3 to limit the swing angle of the movable arc-shaped grid 312. The limiting block 3122 is located on the left and right sides of the bucket box 31 to limit the angle of the movable arc-shaped grid 312 after swinging. The original position before swinging can be limited by the door hinge 3121 itself. The structure does not affect the swing of the heavy hammer slag remover 32; two lifting arms 33 are provided and movably connected to the left and right sides of the bucket box 31; a connecting shaft 321 is provided at the rear upper part of the bucket box 31; the upper end of the heavy hammer slag remover 32 is rotatably connected to the connecting shaft 321, and the lower end contacts the bottom surface inside the bucket box 31; the upper wheel 34 and the lower wheel 35 are arranged vertically and installed on the left and right sides in front of the bucket box 31; a stop block 701 is installed at the upper end of the upper and lower track device 7; the coarse grid chain 46 and the fine grid chain 48 are respectively connected to the lifting arms 33 of the corresponding rake bucket 3; the grid 5 is used to be installed in the pit 100 for filtering impurities, wherein the grid spacing of the grid 5 in the coarse grid device 2 is larger than that of the fine grid device 2. The spacing of the grid 5 in the middle grid 1 is as follows: the coarse grid device 2 is used to filter larger impurities, and the fine grid device 1 is used to filter smaller impurities. The chute 6 and the mounting frame 41 are installed above the pit 100. In this design, the chain drive device 4 synchronously pulls the two sets of rake buckets 3 to move on the upper and lower track devices 7. During the downward movement, due to the setting of the movable arc grid 312 on the rake bucket 3, when encountering large object obstacles, the movable arc grid 312 will swing backward around the door hinge 3121 to avoid the obstacles and prevent the rake bucket 3 from being jammed by the obstacles. After being transported to the bottom, when it is necessary to lift, the chain drive device 4 will pull the rake bucket 3 upward again. During the upward movement, it is connected to the upper opening of the bucket box 31 and the movable arc grid 312. The filter residue behind the grid 5 is collected into the bucket box 31. When it moves upward to the upper end of the upper and lower track device 7, the upper wheel 34 of the rake bucket 3 is blocked by the stop block 701, while the chain drive device 4 continues to pull. The coarse grid chain 46 and the fine grid chain 48 continue to pull the two rake buckets 3, so that the rake buckets 3 rotate forward 90° around the upper wheel 34. Due to the weight after the rotation, the heavy hammer cleaner 32 automatically swings downward, discharging all the filter residue in the bucket box 31 and dropping it into the chute 6. This design eliminates the rake drive device, simplifies the control, and changes the cleaning structure, making cleaning simple. It no longer requires the push rod to be pushed out for cleaning through the drive device, and also improves the cleaning effect in the rake bucket 3.

[0028] The outer diameter of the lower wheel 35 is larger than that of the upper wheel 34; the upper and lower track device 7 includes an upper guide rail 71, a lower guide rail 72, an upper wheel return guide rail 73, a lower wheel return guide rail 74, and a guide rail converter 75; the upper guide rail 71 and the lower guide rail 72 are both mounted on the grid 5; the upper end of the lower guide rail 72 is connected to the middle of the upper guide rail 71 through the guide rail converter 75; the upper wheel return guide rail 73 is connected to the lower end of the lower guide rail 72; the upper wheel return guide rail 73 is connected to the lower end of the lower guide rail 72; the upper wheel return guide rail 74 is connected to the lower end of the lower guide rail 74; the upper wheel return guide rail 75 is connected to the lower end of the lower wheel 3 ... The return guide rail 73 and the upper guide rail 71 have a first notch 702 for the upper wheel 34 to pass through; the lower wheel return guide rail 74 is fixed to the grid 5 and located below the upper wheel return guide rail 73; a second notch 703 is reserved between the lower wheel return guide rail 74 and the lower guide rail 72; the gap of the second notch 703 is smaller than the outer diameter of the lower wheel 35 and larger than the outer diameter of the upper wheel 34; a third notch 702 is provided between the lower wheel return guide rail 74 and the upper guide rail 71 for the lower wheel to pass through. Gap 704; The bucket 3 moves upward along the upper guide rail 71. During the downward movement, it first moves down from the upper part of the upper guide rail 71. When it reaches the junction of the upper guide rail 71 and the lower guide rail 72, it moves to the lower guide rail 72 via the guide rail converter 75. Then it continues to move down along the lower guide rail 72. When the lower wheel 35 reaches the position of the second gap 703, because the outer diameter of the lower wheel 35 is larger than the gap of the second gap 703, it continues from above the second gap 703. The wheel continues to travel to the lower wheel return guide rail 74. After traveling along the lower wheel return guide rail 74, the lower wheel travels back to the upper wheel guide rail 71 through the third gap 704. When the upper wheel 34 travels to the position of the second gap 703, since the outer diameter of the upper wheel 34 is smaller than the gap of the second gap 703, it enters through the second gap 703 and travels along the upper wheel return guide rail 73. After passing the upper wheel return guide rail 73, it travels back to the upper wheel guide rail 71 through the first gap 702, preparing for the upward movement of the scraper bucket 3.

[0029] The guide rail converter 75 includes a movable guide rail 751 and a resetter 752. The movable guide rail 751 is movably connected to the grid 5 via a connecting bracket and is located at the upper end of the lower guide rail 72. The middle parts of both ends of the movable guide rail 751 are rotatably connected to the grid 5 and can rotate to the middle position. The resetter 752 includes a third counterweight 7521, a connecting piece 7522, and a roller 7523. The connecting piece 7522 has an "L"-shaped structure, and its middle part is rotatably connected to the grid 5. The third counterweight 7521 is fixed to one end of the connecting piece 7522. The roller 7523 is connected to the other end of the connecting piece 7522 and contacts the lower front side of the movable guide rail 751. The third hammer 7521, relying on gravity, pulls the connecting piece 7522, causing the roller 7523 to contact the movable guide rail 751. This aligns the upper end of the movable guide rail 751 with the middle of the upper guide rail 71 and the lower end with the upper end of the lower guide rail 72. During the upward movement of the bucket 3, when it passes the guide rail converter 75, the upper wheel 34 and the lower wheel 35 successively contact the movable guide rail 751, causing the movable guide rail 751 to swing outward. This does not affect the upward movement of the bucket 3. After the bucket 3 passes the guide rail converter 75, the third hammer 7521, due to its own weight, will pull the roller 7523 to reset via the connecting piece 7522, thereby resetting the movable guide rail 751 and preparing for the downward movement of the bucket 3.

[0030] The stop block 701 is fixed to the upper end of the upper guide rail 71; the stop block 701 includes a vertical plate 7011 connected to the upper end of the upper guide rail 71 and a horizontal plate 7012 connected to the rear side of the upper end of the horizontal plate 7012; the vertical plate 7011 and the horizontal plate 7012 form an inverted "L" shape structure. The upper wheel 34 transports the material to the upper end of the upper guide rail 71 and enters the stop block 701. The chain continues to pull the rake bucket 3, which can drive the rake bucket 3 to flip and unload the material. By controlling the stroke of the chain, the angle of the rake bucket 3 can be controlled. In this embodiment, the flip angle is controlled to be 90°.

[0031] The lower part of the grid 5 is equipped with slag-collecting teeth 9; the movable arc-shaped grid 312 is staggered with the slag-collecting teeth 9 and can pass through the position of the slag-collecting teeth 9. The slag-collecting teeth 9 are located at a position about 300mm away from the bottom surface of the grid 5 and are used to intercept larger garbage. When the rake bucket 3 moves upward, the garbage intercepted by the slag-collecting teeth 9 can be collected in the bucket box 31 when the movable arc-shaped grid 312 passes through the position of the slag-collecting teeth 9.

[0032] The left and right side walls of the bucket box 31 are respectively provided with strip-shaped holes 313; the lower end of the lifting arm 33 is connected to the strip-shaped holes 313 through a wheel axle, and the upper end is provided with mounting holes for fixing the chain. The sliding and rotating connection is combined to facilitate the flipping of the bucket 3.

[0033] The arc-shaped fixing plate 311 is provided with several filter holes. The filter holes are designed so that water can enter the bucket box 31 through the filter holes during the downward movement of the rake bucket 3, which is conducive to the downward movement of the rake bucket 3. After rising and floating to the surface, the water can also flow out through the filter holes, avoiding excessive water being carried out by the rake bucket 3.

[0034] The upper rear left and right sides of the hopper box 31 are equipped with brackets 322; the connecting shaft 321 is installed between the two brackets 322 to increase the swing arm distance of the hammer cleaner 32. After swinging, the hammer cleaner 32 is completely located outside the hopper box 31, so that all the filter residue in the hopper box 31 can be discharged.

[0035] The above description is not intended to limit the scope of the present invention. Any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the present invention.

Claims

1. A dual-traction two-stage bar screen, comprising a fine bar screen device and a coarse bar screen device distributed front and rear; both the fine bar screen device and the coarse bar screen device are equipped with rakes of the same structure; characterized in that: It also includes a chain drive device; the chain drive device includes a mounting frame, a motor, gears, a drive shaft, a coarse grid sprocket, a coarse grid chain, a fine grid sprocket, and a fine grid chain; two drive shafts are provided and mounted on the mounting frame in a front-to-back manner via shaft seats; two gears are provided and respectively mounted on one end of two drive shafts; the two gears mesh with each other; the power output end of the motor is connected to one of the drive shafts; two coarse grid sprockets are provided and respectively mounted on the front drive shaft; two coarse grid chains are provided and respectively connected to the coarse grid sprockets; one end of the coarse grid chain is fixed with a first weight and hangs down naturally, and the other end is connected to the rake bucket of the coarse grid device; two fine grid sprockets are provided and respectively mounted on the rear drive shaft; two fine grid chains are provided and respectively connected to the fine grid sprockets; one end of the fine grid chain is fixed with a second weight and hangs down naturally, and the other end is connected to the rake bucket of the fine grid device; the fine grid device and The coarse screen device also includes a screen and a chute; the screen is equipped with an upper and lower track device; the chute is located on the front side of the upper part of the screen; the rake bucket can move on the upper and lower track device; the rake bucket includes a bucket box, a heavy hammer cleaner, a lifting arm, an upper wheel, and a lower wheel; the front side of the bucket box is an arc surface; the front side of the bucket box includes an arc-shaped fixed plate and a movable arc-shaped grid; the arc-shaped fixed plate is integrally formed on the lower front of the bucket box; the movable arc-shaped grid is rotatably connected to the upper part of the arc-shaped fixed plate via a door hinge; a limiting block is provided above the rake bucket to limit the swing angle of the movable arc-shaped grid; two lifting arms are provided and movably connected to the left and right sides of the bucket box; a connecting shaft is provided on the upper rear of the bucket box; the upper end of the heavy hammer cleaner is rotatably connected to the connecting shaft, and the lower end contacts the bottom surface inside the bucket box; the upper wheel and the lower wheel are arranged vertically and installed on the left and right sides in front of the bucket box; a stop block is installed on the upper end of the upper and lower track device; the coarse screen chain and the fine screen chain are respectively connected to the lifting arm of the corresponding rake bucket.

2. The dual-traction two-stage bar screen machine according to claim 1, characterized in that: The outer diameter of the lower wheel is larger than that of the upper wheel; the upper and lower track device includes an upper guide rail, a lower guide rail, an upper wheel return guide rail, a lower wheel return guide rail, and a guide rail converter; both the upper and lower guide rails are mounted on the grid; the upper end of the lower guide rail is connected to the middle of the upper guide rail through the guide rail converter; the upper wheel return guide rail is connected to the lower end of the lower guide rail; there is a first notch between the upper wheel return guide rail and the upper guide rail for the upper wheel to pass through; the lower wheel return guide rail is fixed on the grid and located below the upper wheel return guide rail; a second notch is reserved between the lower wheel return guide rail and the lower guide rail; the gap of the second notch is smaller than the outer diameter of the lower wheel and larger than the outer diameter of the upper wheel; there is a third notch between the lower wheel return guide rail and the upper guide rail for the lower wheel to pass through.

3. A dual-traction two-stage bar screen machine according to claim 2, characterized in that: The guide rail converter includes a movable guide rail and a resetter; the movable guide rail is movably connected to the grid via a connecting frame and is located at the upper end of the lower guide rail; the resetter includes a third weight, a connecting member, and a roller; the middle part of the connecting member is rotatably connected to the grid; the third weight is fixed to one end of the connecting member; the roller is connected to the other end of the connecting member and contacts the lower front side of the movable guide rail; the third weight pulls the connecting member by gravity, causing the roller to contact the movable guide rail, so that the upper end of the movable guide rail aligns with the middle part of the upper guide rail, and the lower end aligns with the upper end of the lower guide rail.

4. A dual-traction two-stage bar screen machine according to claim 1, characterized in that: The stop block is fixed to the upper end of the upper guide rail; the stop block includes a vertical plate connected to the upper end of the upper guide rail and a horizontal plate connected to the rear side of the upper end of the vertical plate; the vertical plate and the horizontal plate form an inverted "L" shape.

5. A dual-traction two-stage bar screen machine according to claim 1, characterized in that: The lower part of the grid is equipped with slag-retaining teeth; the movable arc-shaped grid is staggered with the slag-retaining teeth and can pass through the slag-retaining teeth.

6. A dual-traction two-stage bar screen machine according to claim 1, characterized in that: The left and right side walls of the bucket are respectively provided with strip-shaped holes; the lower end of the lifting arm is connected to the strip-shaped holes through a wheel axle, and the upper end is provided with mounting holes for fixing the chain.

7. A dual-traction two-stage bar screen machine according to claim 1, characterized in that: The arc-shaped fixing plate is provided with several filter holes.

8. A dual-traction two-stage bar screen machine according to claim 1, characterized in that: The upper rear left and right sides of the bucket are equipped with brackets; the connecting shaft is installed between the two brackets.

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