Plant waste gas purification and pollution-free emission device for precision casting

Abstract

The invention relates to the technical field of dustproof treatment devices, in particular to a plant waste gas purification and pollution-free emission device for precision casting, which mainly comprises a box body, supporting legs, a door plate, a plurality of filter cages, a knocking mechanism and an impacting mechanism, the door plate is arranged at the bottom of the box body, the filter cages are arranged on the front side surface of the box body, and the knocking mechanism is arranged in the box body. The motor is started to drive the rotating disc and the fixing block to rotate, the fixing block drives the moving frame to move, the moving frame drives the connecting block and the moving rod to reciprocate left and right, the moving rod reciprocates through the hinge block and the hinge rod, and the hinge rod drives the rotating rod to rotate in an arc-shaped reciprocating mode. The rotating rod drives the rotating shaft, the fixing strip, the knocking rod and the two knocking heads I to perform arc-shaped reciprocating rotation, so that the two knocking heads I knock and vibrate the inner wall of the filter cage and drive the filter bag to vibrate, thereby ensuring that dust is more easily shaken off, the dust is thoroughly removed, small pores of the filter bag are not easy to block, and the filtering efficiency and quality are ensured.

Description

Technical Field

[0001] The invention relates to the technical field of dust prevention treatment devices, and in particular to a pollution-free emission device for purifying waste gas from a precision casting plant. Background Art

[0002] The dust in casting exhaust gas mainly comes from the production links such as raw material smelting, molding and pouring, sand falling and cleaning. It has the characteristics of complex composition, high temperature and large dust content, which is seriously harmful to the human body. These dusts need to be dust-proofed during the workshop production process. During the treatment process, the metal powder contained in the dust is recycled. The existing metal dust treatment equipment mostly uses filter bags for recycling. During the treatment process, more metal powder adheres to the outer wall of the filter bag. The filtered gas of the filter bag is discharged through the device, and then the metal dust is filtered.

[0003] In the current metal dust prevention and control system, after the filtration process is completed, the dust accumulated on the filter bag in the device is usually removed by blowing. However, since the metal dust forms a relatively strong adhesion with the surface of the filter bag during the long-term filtration process, it is often difficult to completely remove the dust by blowing alone. The dust that is not completely removed will form a layer of obstacle on the surface of the filter bag. The residual dust may also clog the tiny pores of the filter bag, reducing the effective filtration area, which will not only reduce the speed at which air passes through the filter bag, affecting the filtration efficiency of the entire system, but may also lead to a decrease in filtration quality.

[0004] Therefore, a pollution-free emission device for purifying waste gas from precision casting workshops is proposed. Summary of the invention

[0005] The purpose of the present invention is to provide a pollution-free emission device for purifying factory exhaust gas for precision casting to solve the problems raised by the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions: A pollution-free exhaust gas purification device for precision casting workshops, comprising: a box body, Support legs, arranged at the bottom of the box; A door panel is arranged on the front side of the box body; A plurality of filter cages are provided and are located inside the box; A knocking mechanism is arranged inside the box body and is used to knock and vibrate the inner wall of the side of the filter cage. The knocking mechanism includes a knocking rod arranged inside the filter cage, and knocking heads are fixedly installed at both ends of the knocking rod; The impact mechanism is arranged below the knocking mechanism and is used for knocking and vibrating the inner wall of the lower end of the filter cage. The impact mechanism includes a movable rod located below the knocking head.

[0007] Preferably, an air inlet pipe is fixedly installed on the left side of the box, an exhaust pipe is fixedly installed on the top surface of the box, a partition is fixedly installed on the inner wall of the box, a filter cage is fixedly installed on the bottom surface of the partition, and multiple filter bags are fixedly installed on the outer walls of the filter cages through multiple fixing rings.

[0008] Preferably, a pulse blowing device is fixedly installed on the left side of the box body, a discharge pipe is fixedly installed on the bottom of the box body, a control valve is installed inside the discharge pipe, and a motor is fixedly installed on the top surface of the partition.

[0009] Preferably, a turntable is fixedly mounted on the upper end of the motor output rod, a fixed block is fixedly mounted on the top edge of the turntable, a moving frame is slidably connected to the outer wall of the fixed block, and a connecting block is fixedly mounted on the top surface of the moving frame.

[0010] Preferably, a moving rod is fixedly mounted on the top surface of the connecting block, two limiting sleeves are fixedly mounted on the outer wall of the moving rod, supporting blocks are fixedly mounted on the bottom surfaces of the two limiting sleeves respectively, and the bottom surfaces of the two supporting blocks are fixedly connected to the top surface of the partition.

[0011] Preferably, a plurality of concave plates are fixedly installed on the top surface of the partition, and a rotating shaft is installed on the top surface of the plurality of concave plates through the first bearing seat respectively, and the lower ends of the plurality of rotating shafts respectively extend to the interior of a plurality of filter cages, and a plurality of fixing strips are fixedly installed on the outer walls of the plurality of rotating shafts respectively, and through holes are respectively opened on the sides of the plurality of fixing strips, and the inner walls of the plurality of through holes are respectively fixedly connected to the outer walls of a plurality of knocking rods.

[0012] Preferably, two mounting blocks are fixedly installed on the top surfaces of the multiple concave plates, arc rods are fixedly installed on the sides of the multiple mounting blocks, rotating rods are fixedly installed on the outer walls of the upper ends of the multiple rotating shafts, through grooves are respectively opened on the sides of the multiple rotating rods, and the inner walls of the multiple through grooves are slidably connected to the outer walls of the multiple arc rods.

[0013] Preferably, the other ends of the plurality of rotating rods are respectively hinged with hinge rods, the other ends of the plurality of hinge rods are respectively hinged with hinge blocks, and the side surfaces of the plurality of hinge blocks are respectively fixedly connected to the front and rear side surfaces of the moving rod.

[0014] Preferably, a mounting plate is fixedly installed on the bottom surfaces of the multiple concave plates, two fixing sleeves are fixedly installed on the sides of the multiple mounting plates, a multiple cylindrical rods are fixedly installed on the inner walls of the multiple fixing sleeves, the lower ends of the multiple movable rods slide through the top surfaces of the multiple cylindrical rods and extend to the bottom of the cylindrical rods, the upper ends of the multiple movable rods are respectively arranged to be round heads, the outer walls of the multiple round heads are respectively slidably connected to the bottom surfaces of the multiple fixing strips, and the lower ends of the multiple cylindrical rods are respectively fixedly installed with a second striking head.

[0015] Preferably, grooves are respectively opened inside the multiple cylindrical rods, movable sleeves are respectively fixedly installed on the outer walls of the multiple movable rods, the outer walls of the multiple movable sleeves are respectively slidably connected to the inner walls of the multiple grooves, the outer walls of the multiple movable rods are respectively movably sleeved with springs, and the two ends of the multiple springs are respectively fixedly connected to the bottom surfaces of the multiple movable sleeves and the inner walls of the lower ends of the multiple grooves.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention starts the motor to drive the turntable and the fixed block to rotate, the fixed block drives the moving frame to move, the moving frame drives the connecting block and the moving rod to move back and forth left and right, the moving rod moves back and forth through the hinge block and the hinge rod, the hinge rod drives the rotating rod to rotate back and forth in an arc, the rotating rod drives the rotating shaft and the fixed bar to rotate back and forth in an arc, the fixed bar drives the knocking rod and the two knocking heads to rotate back and forth in an arc, so that the two knocking heads knock and vibrate the inner wall of the filter cage, drive the filter bag to vibrate, and then, while blowing air to the filter bag to remove dust, the filter bag vibrates horizontally, thereby ensuring that the dust is shaken off more easily, so that the dust is thoroughly removed, the small pores of the filter bag are not easily blocked, and the filtration efficiency and quality are guaranteed; While the fixed bar is rotating in an arc, when the fixed bar rotates to the middle position, the fixed bar pushes the round head to move downward, and the round head drives the movable rod and the movable sleeve to move downward, the movable sleeve squeezes the spring, and the movable rod drives the knocking head 2 to move downward to strike the bottom of the filter cage, so that the filter cage drives the filter bag to vibrate in the vertical direction, further shaking off the dust, ensuring that the dust is further removed and not easily remains on the filter bag, thereby ensuring the quality and efficiency of subsequent filtration. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a schematic cross-sectional view of the three-dimensional structure of the present invention; Figure 3 It is a bottom cross-sectional view of the three-dimensional structure of the present invention; Figure 4 For the present invention Figure 2 Enlarged view of point A in the middle; Figure 5 It is a schematic diagram of a partial three-dimensional structure of the present invention; Figure 6 It is a partial three-dimensional structure explosion diagram of the present invention; Figure 7 It is a schematic diagram of the three-dimensional structure of the turntable of the present invention; Figure 8 It is a cross-sectional schematic diagram of the three-dimensional structure of the filter cage of the present invention; Fig. 9 For the present invention Figure 5 Enlarged view of point B in the middle; Fig.10 For the present invention Figure 8 Enlarged view of point C in the middle; Fig.11 It is a cross-sectional schematic diagram of the three-dimensional structure of the cylindrical rod of the present invention.

[0018] In the figure: 1. Box body; 101. Support legs; 102. Door panel; 103. Air inlet pipe; 104. Exhaust pipe; 105. Partition plate; 106. Filter cage; 107. Filter bag; 108. Fixing ring; 2. knocking mechanism; 201. pulse blowing device; 202. discharge pipe; 203. motor; 204. turntable; 205. fixed block; 206. moving frame; 207. connecting block; 208. moving rod; 209. limiting sleeve; 210. supporting block; 211. concave plate; 212. rotating shaft; 213. mounting block; 214. arc rod; 215. rotating rod; 216. hinged rod; 217. hinged block; 218. fixed strip; 219. knocking rod; 220. knocking head one; 3. Impact mechanism; 301. Mounting plate; 302. Fixed sleeve; 303. Cylindrical rod; 304. Movable rod; 305. Round head; 306. Second striking head; 307. Groove body; 308. Moving sleeve; 309. Spring. DETAILED DESCRIPTION

[0019] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0020] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0021] like Figure 1-11As shown, the present application provides a pollution-free emission device for factory waste gas purification for precision casting, including: a box body 1, a supporting leg 101, which is arranged at the bottom of the box body 1, a door panel 102, which is arranged on the front side of the box body 1, a filter cage 106, which is provided in plurality and is located inside the box body 1, a knocking mechanism 2, which is arranged inside the box body 1 and is used to knock and vibrate the inner wall of the side of the filter cage 106, the knocking mechanism 2 includes a knocking rod 219 arranged inside the filter cage 106, and knocking heads 220 are fixedly installed at both ends of the knocking rod 219, and an impact mechanism 3 is arranged below the knocking mechanism 2, which is used to knock and vibrate the inner wall of the lower end of the filter cage 106, and the impact mechanism 3 includes a movable rod 304 located below the knocking head 220.

[0022] In this embodiment: the pulse blowing device 201 in the knocking mechanism 2 is used to blow air to the filter bag 107 to blow off and clean the dust on the filter bag 107, and during the blowing process, the knocking head 220 in the knocking mechanism 2 knocks on the filter cage 106, driving the filter bag 107 to vibrate horizontally to shake off the dust, thereby ensuring the dust cleaning quality. Through the impact mechanism 3, the bottom inner wall of the filter cage 106 is further knocked to ensure that the filter cage 106 drives the filter bag 107 to vibrate in the vertical direction, further shaking off the dust, ensuring the dust cleaning quality and improving the filtration efficiency.

[0023] Specifically, Figure 1-3 As shown, an air intake pipe 103 is fixedly installed on the left side of the box body 1, an exhaust pipe 104 is fixedly installed on the top surface of the box body 1, a partition 105 is fixedly installed on the inner wall of the box body 1, a filter cage 106 is fixedly installed on the bottom surface of the partition 105, and multiple filter bags 107 are fixedly installed on the outer walls of the multiple filter cages 106 through multiple fixing rings 108 respectively.

[0024] In this embodiment: dust gas is introduced from the air inlet pipe 103, and after the dust gas passes through the filter bag 107, the dust is filtered on the surface of the filter bag 107, and the gas passes through the filter bag 107 and is discharged from the exhaust pipe 104, thereby completing the filtration of the gas.

[0025] Specifically, Figure 1-10 As shown, a pulse blowing device 201 is fixedly installed on the left side of the box body 1, a discharge pipe 202 is fixedly installed on the bottom surface of the box body 1, a control valve is installed inside the discharge pipe 202, and a motor 203 is fixedly installed on the top surface of the partition 105.

[0026] In this embodiment: by turning on the pulse blowing device 201, gas is blown to the filter bag 107, thereby blowing away the dust on the surface of the filter bag 107, and the blown away dust is discharged through the discharge pipe 202 to ensure the cleanliness of the filter bag 107.

[0027] Specifically, Figure 1-10As shown, a turntable 204 is fixedly installed on the upper end of the output rod of the motor 203, a fixed block 205 is fixedly installed on the top edge of the turntable 204, a moving frame 206 is slidably connected to the outer wall of the fixed block 205, and a connecting block 207 is fixedly installed on the top surface of the moving frame 206.

[0028] In this embodiment: by turning on the motor 203, the turntable 204 is driven to rotate, the fixed block 205 of the turntable 204 is rotated, and while the fixed block 205 rotates, the moving frame 206 is driven to move back and forth left and right, and the moving frame 206 drives the connecting block 207 to move back and forth left and right.

[0029] Specifically, Figure 1-10 As shown, a moving rod 208 is fixedly installed on the top surface of the connecting block 207, two limiting sleeves 209 are fixedly installed on the outer wall of the moving rod 208, and support blocks 210 are fixedly installed on the bottom surfaces of the two limiting sleeves 209 respectively. The bottom surfaces of the two support blocks 210 are fixedly connected to the top surface of the partition 105.

[0030] In this embodiment: the moving frame 206 drives the connecting block 207 to move back and forth left and right, and at the same time drives the moving rod 208 to move back and forth left and right. Through the setting of the supporting block 210 and the limiting sleeve 209, the moving rod 208 is limited, so that the moving rod 208 can move back and forth more smoothly and is not easy to deviate.

[0031] Specifically, Figure 1-10 As shown, a plurality of concave plates 211 are fixedly installed on the top surface of the partition 105, and a rotating shaft 212 is installed on the top surface of the plurality of concave plates 211 through the first bearing seat respectively, and the lower ends of the plurality of rotating shafts 212 respectively extend to the interior of a plurality of filter cages 106, and a plurality of fixing bars 218 are fixedly installed on the outer walls of the plurality of rotating shafts 212 respectively, and through holes are respectively opened on the sides of the plurality of fixing bars 218, and the inner walls of the plurality of through holes are respectively fixedly connected to the outer walls of a plurality of knocking rods 219.

[0032] In this embodiment: while the rotating shaft 212 performs arc-shaped reciprocating rotation, it drives the fixed bar 218 to perform arc-shaped reciprocating rotation, and the fixed bar 218 drives the knocking rod 219 and the knocking head 220 to perform arc-shaped reciprocating rotation, so that the knocking head 220 knocks on the inner wall of the filter cage 106, and the filter cage 106 drives the filter bag 107 to vibrate horizontally, so that the dust on the surface of the filter bag 107 is shaken off.

[0033] Specifically, Figure 1-10 As shown, two mounting blocks 213 are fixedly mounted on the top surfaces of the multiple concave plates 211, arc-shaped rods 214 are fixedly mounted on the sides of the multiple mounting blocks 213, rotating rods 215 are fixedly mounted on the outer walls of the upper ends of the multiple rotating shafts 212, and through grooves are respectively opened on the sides of the multiple rotating rods 215, and the inner walls of the multiple through grooves are slidably connected to the outer walls of the multiple arc-shaped rods 214.

[0034] In this embodiment, the arc rod 214 is provided to limit the rotation rod 215 while the rotation rod 215 drives the rotation shaft 212 to rotate in an arc shape, so as to ensure that the rotation rod 215 rotates more stably and is not easily deviated.

[0035] Specifically, Figure 1-10 As shown, the other ends of the plurality of rotating rods 215 are respectively hinged with hinge rods 216 , the other ends of the plurality of hinge rods 216 are respectively hinged with hinge blocks 217 , and the sides of the plurality of hinge blocks 217 are respectively fixedly connected to the front and rear sides of the moving rod 208 .

[0036] In this embodiment, the left-right reciprocating movement of the moving rod 208 drives the hinge block 217 to move back-and-forth, drives the hinge rod 216 to move back-and-forth, and the hinge rod 216 drives the rotating rod 215 to rotate back-and-forth in an arc.

[0037] Specifically, Figure 1-11 As shown, the bottom surfaces of the multiple concave plates 211 are respectively fixedly installed with mounting plates 301, the sides of the multiple mounting plates 301 are respectively fixedly installed with two fixing sleeves 302, the inner walls of the multiple fixing sleeves 302 are respectively fixedly installed with multiple cylindrical rods 303, the lower ends of the multiple movable rods 304 slide through the top surfaces of the multiple cylindrical rods 303 and extend to the bottom of the cylindrical rods 303, the upper ends of the multiple movable rods 304 are respectively arranged to be round heads 305, the outer walls of the multiple round heads 305 are respectively slidably connected to the bottom surfaces of the multiple fixing strips 218, and the lower ends of the multiple cylindrical rods 303 are respectively fixedly installed with knocking heads 306.

[0038] In this embodiment: the upper end of the movable rod 304 is set as a round head 305, so that the bottom surface of the fixed strip 218 and the outer wall of the round head 305 are squeezed more smoothly, and the movable rod 304 drives the knocking head 2 306 to move and knock on the bottom inner wall of the filter cage 106, so that the filter cage 106 and the filter bag 107 vibrate in the vertical direction, and the dust on the surface of the filter bag 107 is further shaken off.

[0039] Specifically, Figure 1-11 As shown, a groove body 307 is respectively opened inside the multiple cylindrical rods 303, and a movable sleeve 308 is fixedly installed on the outer walls of the multiple movable rods 304. The outer walls of the multiple movable sleeves 308 are slidingly connected to the inner walls of the multiple groove bodies 307, and the outer walls of the multiple movable rods 304 are movably sleeved with springs 309, and the two ends of the multiple springs 309 are fixedly connected to the bottom surfaces of the multiple movable sleeves 308 and the inner walls of the lower ends of the multiple groove bodies 307.

[0040] In this embodiment: by setting the movable sleeve 308, the groove body 307 and the spring 309, the spring 309 applies elastic force to the movable sleeve 308. When the fixed bar 218 rotates away from the round head 305, the spring 309 pushes the movable sleeve 308 and the movable rod 304 to return to their original positions, driving the knocking head 306 to return to its original position.

[0041] The specific scheme is as follows: after dust filtration, when the dust on the filter bag 107 is removed, the pulse blowing device 201 is turned on to blow air to the filter bag 107, and the motor 203 is turned on at the same time to drive the turntable 204 and the fixed block 205 to rotate, the fixed block 205 drives the moving frame 206 to move, the moving frame 206 drives the connecting block 207 and the moving rod 208 to move back and forth left and right, the moving rod 208 reciprocates through the hinge block 217 and the hinge rod 216, the hinge rod 216 drives the rotating rod 215 to rotate back and forth in an arc, the rotating rod 215 drives the rotating shaft 212 and the fixed bar 218 to rotate back and forth in an arc, the fixed bar 218 drives the knocking rod 219 and the two knocking heads 220 to rotate back and forth in an arc, so that the two knocking heads 220 knock and vibrate the inner wall of the filter cage 106, driving the filter bag 107 to vibrate, and then While blowing air to the filter bag 107 to remove dust, the filter bag 107 vibrates horizontally, thereby ensuring that the dust is shaken off more easily, so that the dust is thoroughly removed and is not easily blocked in the small pores of the filter bag 107, thereby ensuring the efficiency and quality of filtration. While the fixed bar 218 rotates in an arc, when the fixed bar 218 rotates to the middle position, the fixed bar 218 pushes the round head 305 to move downward, and the round head 305 drives the movable rod 304 and the movable sleeve 308 to move downward, and the movable sleeve 308 squeezes the spring 309, and the movable rod 304 drives the knocking head 306 to move downward to strike and knock the bottom of the filter cage 106, so that the filter cage 106 drives the filter bag 107 to vibrate in the vertical direction, further shaking off the dust, ensuring that the dust is further removed and is not easily retained on the filter bag 107, thereby ensuring the quality and efficiency of subsequent filtration.

[0042] A person skilled in the art should understand that the discussion of any of the above embodiments is only exemplary; within the scope of the present invention, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0043] The present invention is intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A pollution-free exhaust gas purification device for precision casting workshops, comprising: The housing (1) is characterized in that: Support legs (101) are arranged at the bottom of the box body (1); A door panel (102) is arranged on the front side of the box body (1); A plurality of filter cages (106) are provided and are located inside the box body (1); A knocking mechanism (2) is arranged inside the box body (1) and is used to knock and vibrate the inner wall of the side of the filter cage (106), wherein the knocking mechanism (2) comprises a knocking rod (219) arranged inside the filter cage (106), and knocking heads (220) are fixedly mounted on both ends of the knocking rod (219); The impact mechanism (3) is arranged below the knocking mechanism (2) and is used to knock and vibrate the inner wall of the lower end of the filter cage (106). The impact mechanism (3) includes a movable rod (304) located below the first knocking head (220).

2. The pollution-free emission device for purifying factory exhaust gas for precision casting according to claim 1 is characterized in that: An air intake pipe (103) is fixedly installed through the left side of the box body (1), an exhaust pipe (104) is fixedly installed through the top surface of the box body (1), a partition (105) is fixedly installed on the inner wall of the box body (1), a filter cage (106) is fixedly installed through the bottom surface of the partition (105), and multiple filter bags (107) are fixedly installed on the outer walls of multiple filter cages (106) via multiple fixing rings (108).

3. The pollution-free emission device for purifying factory exhaust gas for precision casting according to claim 2 is characterized in that: A pulse air blowing device (201) is fixedly installed through the left side of the box body (1), a discharge pipe (202) is fixedly installed through the bottom of the box body (1), a control valve is installed inside the discharge pipe (202), and a motor (203) is fixedly installed on the top surface of the partition (105).

4. The pollution-free emission device for purifying factory exhaust gas for precision casting according to claim 3 is characterized in that: A rotating disk (204) is fixedly mounted on the upper end of the output rod of the motor (203); a fixed block (205) is fixedly mounted on the edge of the top surface of the rotating disk (204); a moving frame (206) is slidably connected to the outer wall of the fixed block (205); and a connecting block (207) is fixedly mounted on the top surface of the moving frame (206).

5. The pollution-free emission device for purifying factory exhaust gas for precision casting according to claim 4 is characterized in that: A moving rod (208) is fixedly mounted on the top surface of the connecting block (207), two limiting sleeves (209) are fixedly mounted on the outer wall of the moving rod (208), supporting blocks (210) are fixedly mounted on the bottom surfaces of the two limiting sleeves (209), and the bottom surfaces of the two supporting blocks (210) are fixedly connected to the top surface of the partition (105).

6. The pollution-free emission device for purifying factory exhaust gas for precision casting according to claim 5 is characterized in that: A plurality of concave plates (211) are fixedly mounted on the top surface of the partition (105); rotating shafts (212) are rotatably mounted on the top surfaces of the plurality of concave plates (211) through the first bearing seat; the lower ends of the plurality of rotating shafts (212) extend into the interior of the plurality of filter cages (106); fixing bars (218) are fixedly mounted on the outer walls of the plurality of rotating shafts (212); through holes are respectively opened on the sides of the plurality of fixing bars (218); and the inner walls of the plurality of through holes are fixedly connected to the outer walls of the plurality of knocking rods (219).

7. The pollution-free emission device for purifying factory exhaust gas for precision casting according to claim 6 is characterized in that: Two mounting blocks (213) are fixedly mounted on the top surfaces of the plurality of concave plates (211), arc-shaped rods (214) are fixedly mounted on the sides of the plurality of mounting blocks (213), rotating rods (215) are fixedly mounted on the outer walls of the upper ends of the plurality of rotating shafts (212), through grooves are respectively formed on the sides of the plurality of rotating rods (215), and the inner walls of the plurality of through grooves are slidably connected to the outer walls of the plurality of arc-shaped rods (214).

8. The pollution-free emission device for purifying factory exhaust gas for precision casting according to claim 7 is characterized in that: The other ends of the plurality of rotating rods (215) are respectively hinged to hinge rods (216), the other ends of the plurality of hinge rods (216) are respectively hinged to hinge blocks (217), and the side surfaces of the plurality of hinge blocks (217) are respectively fixedly connected to the front and rear side surfaces of the moving rod (208).

9. The pollution-free emission device for purifying factory exhaust gas for precision casting according to claim 6 is characterized in that: The bottom surfaces of the plurality of concave plates (211) are respectively fixedly mounted with mounting plates (301), the sides of the plurality of mounting plates (301) are respectively fixedly mounted with two fixing sleeves (302), the inner walls of the plurality of fixing sleeves (302) are respectively fixedly mounted with a plurality of cylindrical rods (303), the lower ends of the plurality of movable rods (304) respectively slide through the top surfaces of the plurality of cylindrical rods (303) and extend to below the cylindrical rods (303), the upper ends of the plurality of movable rods (304) are respectively configured as round heads (305), the outer walls of the plurality of round heads (305) are respectively slidably connected to the bottom surfaces of the plurality of fixing strips (218), and the lower ends of the plurality of cylindrical rods (303) are respectively fixedly mounted with knocking heads (306).

10. The pollution-free emission device for purifying factory exhaust gas for precision casting according to claim 9 is characterized in that: Grooves (307) are respectively provided inside the plurality of cylindrical rods (303); movable sleeves (308) are respectively fixedly mounted on the outer walls of the plurality of movable rods (304); the outer walls of the plurality of movable sleeves (308) are respectively slidably connected to the inner walls of the plurality of grooves (307); springs (309) are respectively movably sleeved on the outer walls of the plurality of movable rods (304); and the two ends of the plurality of springs (309) are respectively fixedly connected to the bottom surfaces of the plurality of movable sleeves (308) and the inner walls of the lower ends of the plurality of grooves (307).

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