Cast iron workpiece paint spraying device

Abstract

The invention relates to the field of workpiece paint spraying, in particular to a cast iron workpiece paint spraying device which comprises a paint spraying room, an air outlet pipeline is installed in the paint spraying room, an air outlet is formed in one surface wall of the air outlet pipeline, and the air outlet pipeline extends towards the outside of the paint spraying room and is used for being connected with purification equipment. A plurality of unwinding mechanisms wound with filter cotton are arranged on one side of the air outlet and arranged in the length direction of the air outlet, a winding mechanism used for winding the filter cotton is arranged on the other side of the air outlet, and the filter cotton unwound by each unwinding mechanism bypasses the air outlet and is wound to the winding mechanism. And the air outlet is shielded by the multiple pieces of unwound filter cotton together. The device has the effect of guaranteeing the service life of the purification equipment.

Description

Technical Field

[0001] The present application relates to the field of workpiece painting, and in particular to a cast iron workpiece painting device. Background Art

[0002] Cast iron workpieces play a vital role in modern industrial production, widely used in a variety of applications, including automotive, shipbuilding, and construction. Surface treatment processes are crucial to improving the quality and corrosion resistance of cast iron workpieces, with painting being a key step. Traditional painting environments typically require controlled air flow to ensure uniform paint adhesion and minimize dust contamination, placing high demands on painting equipment. Effectively purifying the harmful gases and particulate matter generated during the painting process is a pressing issue, particularly in large-scale production lines.

[0003] At present, the common air purification method in the paint shop is to introduce the gas in the paint shop into the purification equipment, which usually includes a spray tower, an activated carbon adsorption chamber, etc.

[0004] However, a large amount of paint mist is generated during the painting process. The paint mist includes a large amount of sticky particles. These particles directly enter the purification equipment and easily clog the purification equipment, thereby reducing the service life of the purification equipment. Summary of the Invention

[0005] In order to ensure the service life of the purification equipment, the present application provides a cast iron workpiece painting device.

[0006] The present application provides a cast iron workpiece painting device that adopts the following technical solution: A device for spraying paint on cast iron workpieces, comprising a paint spraying room, wherein an air outlet duct is installed in the paint spraying room, an air outlet is opened on a surface wall of the air outlet duct, the air outlet duct extends to the outside of the paint spraying room and is used to connect to purification equipment, one side of the air outlet is provided with multiple unwinding mechanisms wrapped with filter cotton, the multiple unwinding mechanisms are arranged along the length direction of the air outlet, and the other side of the air outlet is provided with a winding mechanism for winding up the multiple filter cottons, the filter cotton unwound by each unwinding mechanism bypasses the air outlet and is wound around the winding mechanism, and the multiple unwound filter cottons jointly block the air outlet.

[0007] By adopting the above technical solution, effective shielding and filtering functions are achieved for the air outlet, ensuring that sticky particles generated during the painting process are fully absorbed by the filter cotton, thereby reducing the problem of particles entering subsequent purification devices and clogging the purification equipment, thereby ensuring the service life of the purification equipment. When the shielding layer is clogged with adsorbed sticky particles, multiple unwinding mechanisms are used in conjunction with the rewinding mechanism to facilitate the replacement of the filter cotton at the air outlet. Furthermore, multiple sections of filter cotton jointly block the air outlet, reducing the difficulty of directly producing larger filter cotton.

[0008] Preferably, an air outlet slot is provided on the bottom surface of the paint spraying room, and the air outlet duct is fixedly installed inside the air outlet slot. Two unwinding slots are also provided on the bottom surface of the paint spraying room, and each unwinding slot is arranged along the length direction of the air outlet slot. The unwinding mechanism includes multiple unwinding shafts that are rotatably connected in each unwinding slot, and each unwinding shaft is installed with a rolled filter cotton. The unwinding shaft in each unwinding slot is staggered with the unwinding shaft in another unwinding slot, and the multiple filter cottons at the air outlet are stacked at one end close to each other.

[0009] By adopting this technical solution, the staggered unwinding shafts allow adjacent filter cotton ends to overlap, forming a continuous filter cotton at the air outlet, which completely blocks the air outlet. The air outlet duct is stably fixed in the air outlet trough, which is located at the bottom of the paint spray booth to easily receive falling paint mist.

[0010] Preferably, each of the two side walls in the unwinding groove is provided with a sliding groove, and each unwinding groove is provided with multiple pairs of locking plates, and each locking plate is fixedly connected to a slider at both ends, and each slider is slidably connected to the corresponding sliding groove. The two locking plates in each pair of locking plates are rotatably connected to a protrusion on the side close to each other, and each of the two side walls of the unwinding shaft is provided with a groove, and each groove is engaged with the protrusion on the adjacent locking plate, and each locking plate is installed with a locking component that locks the locking plate and the sliding groove.

[0011] By adopting the above technical solution, a detachable connection between the unwinding shaft and the locking plate is achieved. Specifically, the combination of the slide and the slider enables the locking plate to move flexibly within the unwinding groove, facilitating position adjustment, thereby locking the unwinding shaft in the desired position; the snap-fit structure of the protrusion and the groove ensures that the unwinding shaft is firmly installed between the locking plates, reducing the occurrence of the unwinding shaft detaching from the locking plates; and the locking assembly further enhances the locking effect. By moving a pair of locking plates to the desired position and fixing the unwinding shaft between the pair of locking plates, the position of each locking plate is locked by the locking assembly, effectively reducing the displacement or shaking of the unwinding shaft during the unwinding process, thereby ensuring the smooth release of the filter cotton and improving the overall stability of the paint spraying device.

[0012] The locking lever is secured to the locking plate by a secure coupling between the locking lever and the retaining member, and the locking lever is adapted to engage the retaining member when the lever is in engagement with the cam.

[0013] By adopting the above technical solution, when replacing or installing a new filter, the screw is first rotated, causing it to drive the elastic block away from the unwinding shaft. At this time, the connecting rod moves away from the inclined surface of the locking rod. The locking rod descends under its own weight and disengages from the cavity wall of the sliding groove. At this time, the locking plate releases the lock between the unwinding groove. The pair of locking plates are then moved away from each other, so that the protrusions on the locking plates separate from the grooves on the unwinding shaft. The unwinding shaft can now be separated from between the pair of locking plates, making it easy to remove or replace the unwinding shaft.

[0014] When reinstalling the filter cotton, the unwinding shaft is placed between the pair of locking plates, and each protrusion is re-engaged in the corresponding groove. The screw is then rotated in the opposite direction, which pushes the elastic block and connecting rod forward. The end of the connecting rod contacts the inclined surface of the locking rod, forcing the locking rod to move upward and tightly contact the inner wall of the chute, effectively fixing the locking plates and ensuring that the filter cotton is stably placed on the unwinding mechanism. The operation is simple and the structure is reliable. The elastic block gradually presses against one end face of the unwinding shaft, exerting a certain tension on the unwinding shaft's rotation and unwinding.

[0015] Preferably, a winding groove is provided on the bottom surface of the paint spraying room, and the winding groove is located on the side of the air outlet groove away from the unwinding groove. The winding mechanism includes a winding shaft detachably connected in the winding groove, and the winding shaft is connected to a winding motor that drives the winding shaft to rotate. The winding shaft is connected to a fixing member that fixes one end of the filter cotton, and a support assembly is installed in the winding groove.

[0016] By adopting this technical solution, the take-up trough allows the take-up shaft to be stably installed at the bottom of the spray booth, forming a reasonable spatial layout with the air outlet trough and unwinding trough. The detachable take-up shaft, combined with the take-up motor, achieves an efficient and automated collection process for used filter cotton.

[0017] Preferably, the winding shaft comprises a plurality of single shafts spliced together, one end of each single shaft is fixedly connected to a square block, and the other end is provided with a square groove, each square block is plugged into the square groove on the adjacent single shaft, and the bottom surface of the paint spraying room is also provided with a placement groove, a winding motor is fixedly connected in the placement groove, the output shaft of the winding motor passes through a side wall of the placement groove and extends into the winding groove, a square groove is also provided on an end surface of the output shaft close to the winding shaft, the square groove on the output shaft is plugged into the square block on the adjacent single shaft, and a telescopic part is rotatably connected to a side wall of the winding groove away from the winding motor, and the telescopic part is plugged into the square groove in the adjacent single shaft.

[0018] By adopting this technical solution, the design of a reel composed of multiple single shafts allows for flexible disassembly and installation, reducing the difficulty of producing a complete reel. Furthermore, the interlocking fit of the square blocks and square slots ensures a stable connection between the individual shafts, reducing the risk of relative rotation or disengagement during the reeling process. Furthermore, the provision of telescopic members further enhances the flexibility and stability of the structure, allowing both ends of the reel to be securely fixed, thereby improving stability and reliability during the reeling process and facilitating assembly and maintenance of the reel.

[0019] Preferably, the telescopic part includes a sleeve rotatably connected to the side wall of the winding groove, an adjusting rod is slidably inserted in the sleeve, one end of the adjusting rod is inserted into the adjacent square groove, and a locking bolt is threaded on the sleeve, one end of the locking bolt is inserted into the interior of the sleeve and pressed against the side wall of the adjusting rod.

[0020] By adopting the above technical solution, the telescopic member is composed of a sleeve, an adjusting rod and a locking bolt, which can realize the position adjustment of the adjusting rod in the sleeve and fix it by the locking bolt, thereby adapting to single-axis combinations of different lengths.

[0021] Preferably, the support assembly includes a plurality of fixed rods fixedly connected to the bottom wall of the winding groove, a guide groove is opened at the top of the fixed rod, a support rod is slidably connected in the guide groove, the upper end of the support rod is fixedly connected to an arc rod, the arc rod contacts the side wall of the winding shaft, a spring is installed in the guide groove, one end of the spring contacts the bottom wall of the guide groove, and the other end contacts the bottom surface of the support rod.

[0022] By adopting this technical solution, the support assembly can effectively adapt to the gradually increasing diameter of the take-up shaft as the filter cotton increases during the reeling process, ensuring that the take-up shaft always remains stable. Specifically, the guide groove on the fixed rod cooperates with the sliding support rod and the curved rod to dynamically adjust the support of the take-up shaft, ensuring the tension and reeling of the filter cotton.

[0023] Preferably, a supporting mesh plate is clamped at the air outlet, and a sealing plate is clamped at the opening of the winding groove and the opening of the unwinding groove.

[0024] By adopting this technical solution, the support screen effectively reduces deformation or displacement of the filter cotton under the influence of the airflow at the outlet, ensuring that the filter cotton remains flat, thereby improving the uniformity of air circulation during the painting process. Furthermore, the installation of the sealing plate reduces the ingress of foreign matter into the unwinding and rewinding troughs, protecting the internal structures of the unwinding and rewinding troughs from contamination, extending the equipment's service life, and ensuring the operational stability of the entire painting system.

[0025] In summary, this application includes at least one of the following beneficial technical effects: 1. By setting up multiple unwinding mechanisms on one side of the air outlet and a rewinding mechanism on the other side, the paint mist generated during the painting process is initially intercepted and filtered using multi-layer filter cotton, effectively preventing the paint mist containing sticky particles from directly entering the subsequent purification equipment, thereby reducing the occurrence of purification equipment blockage and extending the service life of the purification equipment; 2. Multiple unwinding mechanisms are arranged along the length of the air outlet, and the filter cotton is synchronously wound by the winding mechanism to achieve the function of dynamic replacement of filter materials, ensuring stable filtration efficiency and simplifying maintenance operations; 3. The design of filter cotton covering the air outlet can evenly distribute the airflow, optimize the air flow in the paint spraying room, improve the quality of painting and reduce the risk of dust diffusion. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural diagram of a paint spraying room according to an embodiment of the present application.

[0027] Figure 2 This is a structural diagram of an embodiment of the present application showing that the air outlet is blocked by filter cotton.

[0028] Figure 3 It is a structural schematic diagram of the unwinding mechanism according to an embodiment of the present application.

[0029] Figure 4 It is a schematic structural diagram of a locking rod according to an embodiment of the present application.

[0030] Figure 5 It is a structural diagram of the winding mechanism according to an embodiment of the present application.

[0031] Figure 6 It is a structural diagram of a single axis in an embodiment of the present application.

[0032] Figure 7 It is a structural diagram of the support assembly according to an embodiment of the present application.

[0033] Explanation of reference numerals: 1, spray booth; 11, air outlet slot; 12, unwinding slot; 121, slide slot; 13, rewinding slot; 14, sealing plate; 2, air outlet duct; 21, air outlet; 22, support mesh plate; 3, filter cotton; 4, unwinding mechanism; 41, unwinding shaft; 411, groove; 42, locking plate; 421, limit slot; 422, connecting channel; 43, slider; 431, locking slot; 44, bump; 45, lock Fixed assembly; 451, locking rod; 452, elastic block; 453, screw; 454, connecting rod; 5, winding mechanism; 51, winding shaft; 511, single shaft; 5111, square groove; 512, square block; 52, winding motor; 53, telescopic part; 531, sleeve; 532, adjusting rod; 6, supporting assembly; 61, fixing rod; 611, guide groove; 62, supporting rod; 63, arc rod; 64, spring. DETAILED DESCRIPTION

[0034] The following is combined with Figure 1-Figure 7 This application is described in further detail.

[0035] The present application discloses a device for spraying paint on a cast iron workpiece. Figure 1 and Figure 2 The paint spraying device includes a paint spray booth 1. The bottom surface of the paint spray booth 1 is provided with a long air outlet slot 11. An air outlet duct 2 is fixedly connected to the air outlet slot 11. The upper surface of the air outlet duct 2 is provided with an air outlet 21. A conveying pipe is fixed to and connected to one side wall of the air outlet duct 2. An exhaust fan is installed on the conveying pipe. The end of the conveying pipe away from the air outlet duct 2 is used to connect to the purification equipment.

[0036] Reference Figure 1 and Figure 2 The bottom surface of the spray booth 1 is also provided with two unwinding slots 12 and a rewinding slot 13. The two unwinding slots 12 are located on the same side of the air outlet slot 11 and are arranged parallel to the air outlet slot 11. The rewinding slot 13 is located on the side of the air outlet slot 11 away from the unwinding slot 12 and is also arranged parallel to the air outlet slot 11. Filter cotton 3 is installed at the air outlet 21. Each unwinding slot 12 is equipped with an unwinding mechanism 4 for unwinding the filter cotton 3. The rewinding slot 13 is equipped with a rewinding mechanism 5 for rewinding the filter cotton 3. The filter cotton 3 unwound by the unwinding mechanism 4 passes through the air outlet 21 and is rewound by the rewinding mechanism 5.

[0037] Each unwinding slot 12 has a through hole for inserting the filter cotton 3 on its side wall near the air outlet slot 11. The rewinding slot 13 also has a through hole for inserting the filter cotton 3 on its side wall near the air outlet slot 11. The filter cotton 3 unwound by the unwinding mechanism 4 passes through the corresponding through hole, passes through the air outlet 21, and then passes through the corresponding through hole into the rewinding slot 13 to be rewound.

[0038] A supporting mesh plate 22 is clamped at the air outlet 21 , and a sealing plate 14 is clamped at the opening of the winding groove 13 and the opening of the unwinding groove 12 to play the role of dust prevention and isolation.

[0039] Reference Figure 2 and Figure 3 The unwinding mechanism 4 includes multiple unwinding shafts 41 rotatably connected within each unwinding slot 12. Each unwinding shaft 41 is mounted with a rolled filter cotton 3. To ensure a reasonable layout of the unwinding shafts 41 and to ensure that the filter cotton 3 passing through the air outlet 21 can completely cover the air outlet 21, the unwinding shafts 41 within the same unwinding slot 12 are staggered with the unwinding shafts 41 in other unwinding slots 12. The multiple filter cottons 3 at the air outlet 21 are stacked with their ends adjacent to each other, i.e., one end of a filter cotton 3 overlaps an adjacent filter cotton 3, thereby enhancing the sealing and stability of the air outlet 21.

[0040] In order to facilitate the fixation of the unwinding shaft 41, a sliding groove 121 is provided on both side walls of each unwinding groove 12. The sliding groove 121 is arranged along the length direction of the unwinding groove 12. A plurality of pairs of locking plates 42 are provided in the sliding groove 121. Both ends of one of the locking plates 42 in each pair of locking plates 42 are fixedly connected with a slider 43. One slider 43 corresponds to one sliding groove 121, and the slider 43 is slidably connected to the sliding groove 121.

[0041] Each pair of locking plates 42 has a protrusion 44 rotatably connected to its adjacent side. The protrusion 44 is a square. Both end surfaces of the unwinding shaft 41 have grooves 411 that match the shape of the protrusion 44. Each groove 411 engages with a protrusion 44 on an adjacent locking plate 42, thereby securing the unwinding shaft 41 between the pair of locking plates 42. A locking assembly 45 is also mounted on each locking plate 42 for locking the locking plate 42 to the chute 121.

[0042] Reference Figure 3 and Figure 4 The locking assembly 45 includes a locking slot 431 defined in one of the sliders 43 on each locking plate 42. The opening of the locking slot 431 is located on the upper surface of the slider 43, and a locking rod 451 is vertically slidably connected within the locking slot 431. A limiting slot 421 is defined on the side of the locking plate 42 adjacent to the reel 51. An elastic block 452 is laterally slidably connected within the limiting slot 421. A screw 453 is threadedly connected to the locking plate 42. One end of the screw 453 extends into the limiting slot 421 and is rotationally connected to the elastic block 452.

[0043] A connecting channel 422 communicating with the locking groove 431 is formed on one side wall of the limiting groove 421, and a connecting rod 454 is inserted into the connecting channel 422. One end of the connecting rod 454 is fixedly connected to the elastic block 452, and the other end is inserted into the locking groove 431. The bottom end of the locking rod 451 is provided with an inclined surface, and the end of the connecting rod 454 entering the locking groove 431 abuts against the inclined surface on the locking rod 451.

[0044] When the screw 453 is rotated to push the elastic block 452 toward the unwinding shaft 41, the movement of the elastic block 452 drives the connecting rod 454 to move laterally. The movement of the connecting rod 454 pushes the locking rod 451 upward by pushing the inclined surface. When the elastic block 452 abuts the end surface of the take-up shaft 51, the upper end of the locking rod 451 abuts the upper cavity wall of the chute 121. At this time, the locking plate 42 is locked, and the elastic block 452 abutting the end surface of the take-up shaft 51 limits the unwinding speed of the take-up shaft 51. To strengthen the locking effect of the locking plate 42, an elastic layer is fixedly connected to the upper cavity wall of one of the chute 121. The upper end of the locking rod 451 abuts the elastic layer, thereby strengthening the locking of the locking plate 42.

[0045] Reference Figure 5 and Figure 6 The winding mechanism 5 includes a winding shaft 51 detachably connected to the winding groove 13. A placement groove is pre-set on the bottom surface of the spray booth 1. The placement groove is located on one side of the winding groove 13. A winding motor 52 is fastened to the placement groove by screws. One end of the winding motor 52 passes through the side wall of the placement groove and extends into the winding groove 13.

[0046] The winding shaft 51 is composed of multiple single shafts 511. Each single shaft 511 is fixedly connected to a square block 512 at one end and has a square slot 5111 at the other end. Each square block 512 plugs into the square slot 5111 on the adjacent single shaft 511. A telescopic member 53 is rotatably connected to the side wall of the winding slot 13 away from the winding motor 52.

[0047] Reference Figure 6 and Figure 7 The telescopic member 53 includes a sleeve 531 and an adjusting rod 532. One end of the sleeve 531 is rotatably connected to a side wall of the winding groove 13 away from the winding motor 52. The adjusting rod 532 is slidably connected in the sleeve 531. One end of the adjusting rod 532 is plugged into the square groove 5111 in the adjacent single shaft 511. A locking bolt is threaded on the sleeve 531. One end of the locking bolt is inserted into the sleeve 531 and pressed against the side wall of the adjusting rod 532.

[0048] Reference Figure 5 and Figure 6The end face of the winding motor 52 entering the winding groove 13 is provided with a square groove 5111, and the square groove 5111 on the output shaft of the winding motor 52 is plugged into the square block 512 on the adjacent single shaft 511. The end of each filter cotton 3 is fixed to the winding shaft 51 by screws.

[0049] When one end of each filter pad 3 is fixed to the reel-up shaft 51, the reel-up motor 52 is driven, and the output shaft of the reel-up motor 52 rotates, thereby driving the reel-up shaft 51 to reel the filter pad 3. During the reeling process, in order to prevent sticky particles on the filter pad 3 from flying around, the surface of the filter pad 3 where the sticky particles are adhered is wound inside during the reeling process.

[0050] Reference Figure 7 A support assembly 6 is also installed in the winding groove 13. The support assembly 6 includes a plurality of fixed rods 61. The top of the fixed rod 61 is provided with a guide groove 611. A support rod 62 is vertically slidably connected in the guide groove 611. The upper end of the support rod 62 is fixedly connected to an arc rod 63, which contacts the side wall of the winding shaft 51. A spring 64 is installed in the guide groove 611. One end of the spring 64 is fixedly connected to the bottom wall of the guide groove 611, and the other end is fixedly connected to the bottom surface of the support rod 62.

[0051] The operating principle of a cast iron workpiece painting device according to an embodiment of the present application is as follows: during the painting process, the exhaust fan is started, and the paint mist enters the purification device along the air outlet 21, the air outlet duct 2, and the conveying pipe. When the paint mist passes through the air outlet 21, sticky particles are adsorbed onto the filter cotton 3. When the filter cotton 3 at the air outlet 21 needs to be replaced, the reeling mechanism 5 is started to reel the filter cotton 3. During the reeling process, the reeling mechanism 5 pulls the filter cotton 3 at the air outlet 21 away from the air outlet 21, and the unreeling mechanism 4 unreels the filter cotton 3, thereby achieving the effect of dynamically replacing the filter cotton 3 at the air outlet 21.

[0052] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A paint spraying device for cast iron workpieces, characterized in that: The invention comprises a paint spraying room (1), wherein an air outlet duct (2) is installed in the paint spraying room (1), an air outlet (21) is opened on a surface wall of the air outlet duct (2), the air outlet duct (2) extends to the outside of the paint spraying room (1) and is used to connect to a purification device, a plurality of unwinding mechanisms (4) wound with filter cotton (3) are provided on one side of the air outlet (21), the plurality of unwinding mechanisms (4) are arranged along the length direction of the air outlet (21), and a rewinding mechanism (5) for rewinding the plurality of filter cottons (3) is provided on the other side of the air outlet (21), the filter cotton (3) unwound by each unwinding mechanism (4) bypasses the air outlet (21) and is wound onto the rewinding mechanism (5), and the plurality of unwound filter cottons (3) jointly block the air outlet (21).

2. A cast iron workpiece painting device according to claim 1, characterized in that: The bottom surface of the spray paint room (1) is provided with an air outlet slot (11), the air outlet duct (2) is fixedly installed inside the air outlet slot (11), and the bottom surface of the spray paint room (1) is also provided with two unwinding slots (12), each unwinding slot (12) is arranged along the length direction of the air outlet slot (11), and the unwinding mechanism (4) includes a plurality of unwinding shafts (41) that are rotatably connected in each unwinding slot (12), and each unwinding shaft (41) is installed with a rolled filter cotton (3), and the unwinding shaft (41) in each unwinding slot (12) is staggered with the unwinding shaft (41) in another unwinding slot (12), and the plurality of filter cottons (3) at the air outlet (21) are stacked at one end close to each other.

3. A cast iron workpiece painting device according to claim 2, characterized in that: Each of the two side walls of the unwinding slot (12) is provided with a slide groove (121), and each of the unwinding slots (12) is provided with multiple pairs of locking plates (42). Both ends of each locking plate (42) are fixedly connected with a slider (43), and each slider (43) is slidably connected to the corresponding slide groove (121). The two locking plates (42) in each pair of locking plates (42) are rotatably connected to a protrusion (44) on the side close to each other. Each of the two side walls of the unwinding shaft (41) is provided with a groove (411), and each groove (411) is engaged with the protrusion (44) on the adjacent locking plate (42). Each of the locking plates (42) is installed with a locking component (45) for locking the locking plate (42) and the slide groove (121).

4. A cast iron workpiece painting device according to claim 3, characterized in that: The locking assembly (45) includes a locking groove (431) formed on one of the sliders (43) on each locking plate (42), a locking rod (451) being slidably connected in the locking groove (431), a limiting groove (421) being formed on a side of the locking plate (42) close to the unwinding shaft (41), an elastic block (452) being slidably connected in the limiting groove (421) for contacting the end face of the unwinding shaft (41), a screw (453) being threadedly connected on the locking plate (42), one end of the screw (453) extending into the limiting groove (421) and being rotatably connected to the elastic block (452), the limiting groove (421) ) is provided with a connecting channel (422) connected to the locking groove (431) on one side wall, and a connecting rod (454) is inserted into the connecting channel (422), one end of the connecting rod (454) is fixedly connected to the side wall of the elastic block (452), and the other end is inserted into the locking groove (431), and an inclined surface is provided at one end of the locking rod (451) close to the connecting rod (454), and one end of the connecting rod (454) contacts the inclined surface on the locking rod (451), and when the elastic block (452) moves in a direction close to the unwinding shaft (41), the connecting rod (454) pushes the locking rod (451) to press against an inner cavity wall of the slide groove (121).

5. The cast iron workpiece painting device according to claim 2, characterized in that: A reeling slot (13) is provided on the bottom surface of the spray booth (1), and the reeling slot (13) is located on a side of the air outlet slot (11) away from the unwinding slot (12). The reeling mechanism (5) includes a reeling shaft (51) detachably connected to the reeling slot (13), a reeling motor (52) for driving the reeling shaft (51) to rotate is connected to the reeling shaft (51), a fixing member for fixing one end of the filter cotton (3) is connected to the reeling shaft (51), and a support assembly (6) is installed in the reeling slot (13).

6. A paint spraying device for cast iron workpiece according to claim 5, characterized in that: The reel (51) comprises a plurality of mutually connected single shafts (511), one end of each single shaft (511) is fixedly connected to a square block (512), and the other end is provided with a square slot (5111), and each square block (512) is plugged into the square slot (5111) on the adjacent single shaft (511). The bottom surface of the spray booth (1) is also provided with a placement slot, and a reel motor (52) is fixedly connected to the placement slot, and the output shaft of the reel motor (52) is passed through A side wall of the placement slot is passed through and extends into the winding slot (13); an end face of the output shaft close to the winding shaft (51) is also provided with a square slot (5111); the square slot (5111) on the output shaft is plugged into a square block (512) on an adjacent single shaft (511); a side wall of the winding slot (13) away from the winding motor (52) is rotatably connected to a telescopic member (53); the telescopic member (53) is plugged into the square slot (5111) in the adjacent single shaft (511).

7. A cast iron workpiece painting device according to claim 6, characterized in that: The telescopic member (53) includes a sleeve (531) rotatably connected to the side wall of the winding groove (13), an adjusting rod (532) is slidably inserted into the sleeve (531), one end of the adjusting rod (532) is inserted into the adjacent square groove (5111), and a locking bolt is threadedly connected to the sleeve (531), one end of the locking bolt is inserted into the sleeve (531) and pressed against the side wall of the adjusting rod (532).

8. The cast iron workpiece painting device according to claim 5, characterized in that: The support assembly (6) includes a plurality of fixed rods (61) fixedly connected to the bottom wall of the winding groove (13), a guide groove (611) is provided at the top end of the fixed rod (61), a support rod (62) is slidably connected in the guide groove (611), an arc rod (63) is fixedly connected to the upper end of the support rod (62), the arc rod (63) contacts the side wall of the winding shaft (51), a spring (64) is installed in the guide groove (611), one end of the spring (64) contacts the bottom wall of the guide groove (611), and the other end contacts the bottom surface of the support rod (62).

9. The cast iron workpiece painting device according to claim 5, characterized in that: A supporting mesh plate (22) is clamped at the air outlet (21), and a sealing plate (14) is clamped at the opening of the rewinding slot (13) and the opening of the unwinding slot (12).

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