System and device for purifying workpiece spraying exhaust air

Abstract

The utility model discloses a device for purifying workpiece spraying exhaust air, which comprises a dry type paint mist separating device, and the air inlet airflow direction of the dry type paint mist separating device is consistent with the airflow direction of the workpiece spraying exhaust air, so that the over-spraying paint mist airflow is stable, and the purification adsorption area is increased; the utility model further discloses a system for purifying workpiece spraying exhaust air, the system for purifying the workpiece spraying exhaust air comprises a paint spraying area in a paint spraying chamber, a sprayer is installed in the paint spraying chamber, a workpiece is arranged in the paint spraying chamber, an operation platform is installed in the paint spraying chamber, a conveyor is installed on the operation platform, and the conveyor is connected with the paint spraying area. And the workpiece is placed on the conveyor. The air inlet airflow direction of the dry type paint mist filter is consistent with the air exhaust direction after a workpiece is sprayed, so that the dry type paint mist filter has the maximum adsorption area and purification efficiency, the dry type paint mist filter and the ventilation connector are sealed in an active pneumatic mode, and the sealing effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid spraying, in particular to a system and a device for purifying exhaust air during workpiece spraying. Background Art

[0002] In recent years, dry-type filtration paint mist separation technology has replaced limestone powder and electrostatic paint mist separation technology and become the main development direction of dry paint mist separation technology due to its energy saving, environmental protection, low cost and simple waste disposal. At present, various engineering companies have launched various forms of dry paint mist filters and paint mist separation devices, which are used to purify the exhaust air containing overspray paint mist after the workpiece is sprayed, so that the purified exhaust air can be recycled. Regardless of whether the dry paint mist filter uses a disposable or recyclable separation medium, when the filter adsorbs overspray paint mist to saturation, the paint mist filter needs to be replaced or cleaned, and the paint mist filter needs to be disconnected from the exhaust interface. After the replacement or cleaning is completed, the paint mist filter that has the ability to hold paint again needs to be connected to the exhaust interface.

[0003] a) The dry paint mist filter commonly used in the industry currently has multiple deflection areas between the air inlet and outlet air flow directions and the exhaust direction of the workpiece after spraying. The unstable airflow in the deflection area will cause local accumulation of paint mist and contamination of the flow channel, and also affect the purification efficiency of the dry paint mist filter for overspray paint mist.

[0004] b) After the dry paint mist filter is saturated, it takes a long time to replace it, and the exhaust is exposed to the replacement operation area during replacement, which is not friendly to the operating environment.

[0005] c) When the dry paint mist filter is disconnected from and connected to the ventilation interface, the interface needs to be unsealed and sealed. The sealing method currently adopted by the industry consists of a passive elastic sealing strip with a certain degree of deformation and a manual or automatic clamping mechanism (such as a cylinder), which lacks effective sealing detection.

[0006] d) When the dry paint mist filter is saturated, the current detection method is usually online pressure difference detection or offline weight detection of the paint capacity, which cannot achieve in-situ weight detection of the paint capacity. Utility Model Content

[0007] The purpose of the utility model is to solve the above technical problems and to propose a system and device for purifying exhaust air of workpiece spraying.

[0008] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0009] A device for purifying exhaust air from workpiece spraying includes a dry paint mist separation device. The air intake direction of the dry paint mist separation device is consistent with the air flow direction of the workpiece spray exhaust. The overspray paint mist generated after the workpiece is sprayed is purified by the dry paint mist separation device, and the purified exhaust air is connected to the back-end process equipment through the exhaust purification area.

[0010] Preferably, a dry paint mist filter is further included, positioned between the paint mist separation and introduction area and the exhaust purification area. Exhaust air containing overspray paint mist after workpiece spraying is directed from the paint mist settling area to the paint mist separation and introduction area, and then evenly enters the dry paint mist filter through the paint mist separation and introduction area.

[0011] Preferably, a sealing device is also included, which uses a pneumatic seal driven by compressed air to achieve the sealing and unsealing of the dry paint mist filter and the paint mist separation inlet area and the exhaust purification area. When compressed air is not passed into the pneumatic seal, there is a certain gap between the pneumatic seal and the sealing surface of the dry paint mist filter. When compressed air of a certain pressure is passed into, the pneumatic seal expands and contacts the sealing surface of the dry paint mist filter, then deforms and is gradually tightened.

[0012] Preferably, the sealing device is installed on the flange surfaces of the paint mist separation introduction area and the exhaust purification area.

[0013] Preferably, a replacement device is further included, the replacement device includes a carrier vehicle arranged in the dry paint mist separation device, the carrier vehicle includes an empty carrier vehicle and a replacement carrier vehicle, and a new dry paint mist filter is placed on the replacement carrier vehicle.

[0014] Preferably, the dry paint mist filter installed in the dry paint mist separation device is a dry paint mist filter that has adsorbed paint mist.

[0015] Preferably, a weighing device is further included, which includes a plurality of weighing sensors installed in the dry paint mist separation device, and a bottom load-bearing wheel is installed at the upper end of the weighing sensor, and the bottom load-bearing wheel is against the bottom of the dry paint mist filter.

[0016] Preferably, the horizontal surface of the dry paint mist filter is provided with side guide wheels along the longitudinal direction, and the side guide wheels are arranged to abut against the dry paint mist filter.

[0017] Preferably, it includes an air source processing and detection unit, a distribution and control unit and multiple sealing devices. The air source processing and detection unit and the distribution and control unit are connected, and the distribution and control unit is connected to multiple sealing devices. Multiple sealing devices share one or more sets of air source processing and detection units, distribution and control units and other devices to realize the detection and distribution control of compressed air.

[0018] The utility model also discloses a system for purifying exhaust air from spraying workpieces, comprising a spraying area in a spraying room, a sprayer installed in the spraying room, a workpiece provided in the spraying room, an operating platform installed in the spraying room, a conveyor installed on the operating platform, and the workpiece placed on the conveyor.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The inlet airflow direction of the dry paint mist filter is consistent with the exhaust direction of the workpiece after spraying. The airflow containing overspray mist can enter the dry paint mist filter evenly and stably and be adsorbed, giving the dry paint mist filter the largest adsorption area and purification efficiency. The stable airflow can also reduce contamination of the flow channel and shorten the manual maintenance cycle.

[0021] 2. After the dry paint mist filter is saturated, it can be replaced quickly and continuously (double-sided transportation). The replacement time is short, and the exhaust exposure direction is far away from the replacement operation area, so the exhaust exposure is almost negligible.

[0022] 3. The transport vehicle can be a manual transport vehicle or an AGV for automatic replacement and transportation. It can be transported on one side or on both sides (preferred).

[0023] 4. The dry paint mist filter and ventilation interface are sealed with an active pneumatic seal. This seal improves sealing effectiveness by controlling compressed air pressure to change the deformation of the sealing strip. Sensors detect pressure and flow within the pneumatic seal, enabling real-time monitoring of the seal and eliminating the risk of leaks.

[0024] 5. The dry paint mist filter can be weighed on site using a weighing device, realizing real-time analysis of the weight of adsorbed paint residue. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the structure of the device for purifying exhaust air from spraying workpieces proposed by the present invention;

[0026] Figure 2 This is a side view of the device for purifying exhaust air from spraying workpieces proposed by the present invention;

[0027] Figure 3 This is a schematic structural diagram of point A in the device for purifying exhaust air from spraying workpieces proposed by the present invention;

[0028] Figure 4 This is a schematic structural diagram of point B in the device for purifying exhaust air from spraying workpieces proposed by the present invention;

[0029] Figure 5This is a block diagram of the system for purifying workpiece spray exhaust air proposed by the utility model;

[0030] Figure 6 This is a schematic diagram of the second exhaust method for purifying workpiece spraying exhaust proposed by the present invention;

[0031] Figure 7 This is a schematic diagram of the third exhaust method proposed by the present invention for purifying exhaust air during workpiece spraying.

[0032] In the figure: 1 painting area, 11 painting room, 12 sprayer, 13 operating platform, 2 workpiece, 3 conveyor, 4 dry paint mist separation device, 41 paint mist settling area, 42 paint mist separation inlet area, 43 sealing device, 431 pneumatic seal, 432 compressed air, 44 exhaust purification area, 45 weighing device, 451 weighing sensor, 452 side guide wheel, 453 bottom load-bearing wheel, 46 workbench, 47 dry paint mist filter, 471 dry paint mist filter after adsorbing paint mist, 472 new dry paint mist filter, 5 carrier, 51 empty carrier, 52 replacement carrier. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0034] Reference Figures 1-4 , a device for purifying exhaust air from workpiece spraying, including a dry paint mist separator 4, the air inlet direction of the dry paint mist separator 4 being consistent with the airflow direction of exhaust air from the workpiece 2 spraying, the overspray paint mist generated after the workpiece 2 is sprayed is purified by the dry paint mist separator 4, and the purified exhaust air is connected to the back-end process equipment through the exhaust purification area 44;

[0035] A paint spray booth 11 is installed on the workbench 46. The paint spray booth 11 has a paint spraying area 1. A sprayer 12 is installed in the paint spray booth 11. A workpiece 2 is provided in the paint spray booth 11. An operating platform 13 is installed in the paint spray booth 11. A conveyor 3 is installed on the operating platform 13. The workpiece 2 is placed on the conveyor 3. The paint spraying area 1 in the paint spray booth 11, the sprayer 12 is installed in the paint spray booth 11. A workpiece 2 is provided in the paint spray booth 11. An operating platform 13 is installed in the paint spray booth 11. A conveyor 3 is installed on the operating platform 13. The workpiece 2 is placed on the conveyor 3.

[0036] During the spraying process, the paint application rate of the sprayer 12 is not 100%, so a certain amount of overspray paint mist will enter the air; the overspray paint mist generated after spraying is purified by the dry paint mist separation device 4, and the purified exhaust air is connected to the back-end process equipment through the exhaust purification area 44, so that the purified exhaust air can be recycled and can also be discharged after being treated by the exhaust gas treatment equipment.

[0037] A moving mechanism for moving the workpiece 2 is installed in the paint spray booth 11. Below the paint spray booth 11 is a dry paint mist separation device 4. The dry paint mist separation device 4 includes a paint mist settling area 41 fixed to a workbench 46. A paint mist separation introduction area 42 is installed at the bottom of the paint mist settling area 41. An exhaust purification area 44 is provided below the paint mist separation introduction area 42. The dry paint mist filter 47 is also included. The dry paint mist filter 47 is placed between the paint mist separation introduction area 42 and the exhaust purification area 44. After the workpiece 2 is sprayed, the exhaust air containing overspray paint mist is guided from the paint mist settling area 41 to the paint mist separation introduction area 42, and then evenly enters the dry paint mist filter 47 through the paint mist separation introduction area 42.

[0038] After the workpiece 2 is sprayed, exhaust air containing overspray mist is directed within the paint mist settling area 41 to the paint mist separation and inlet area 42. Within the paint mist separation and inlet area 42, the exhaust airflow containing overspray mist aligns with the air intake direction of the rear-end dry paint mist filter 47. After passing through the paint mist separation and inlet area 42, the exhaust airflow becomes uniform and stable. This consistent, uniform, and stable airflow maximizes the adsorption area and purification efficiency of the dry paint mist filter 47. Furthermore, the stable airflow reduces contamination of the flow path and reduces maintenance cycles. Within the dry paint mist filter 47, the overspray mist is adsorbed or separated by the filter material, resulting in a purified exhaust airflow with a filtration efficiency exceeding 98%.

[0039] The dry paint mist filter 47 and the ventilation interface, namely the paint mist separation inlet area 42 and the exhaust purification area 44, are sealed by a sealing device 43. An active pneumatic sealing sealing device 43 is provided between the dry paint mist filter 47 and the paint mist separation inlet area 42 and the exhaust purification area 44. Flanges are installed on the paint mist separation inlet area 42 and the exhaust purification area 44, and the sealing device 43 is installed on the flanges of the paint mist separation inlet area 42 and the exhaust purification area 44.

[0040] Among them, the sealing device 43 is usually composed of a passive elastic sealing strip with a certain deformation and a manual or automatic pressing mechanism such as a cylinder; the sealing device 43 adopts a pneumatic seal 431 driven by compressed air 432 to realize the unsealing of the dry paint mist filter 47 and the sealing box of the dry paint mist filter 47. The sealing device 43 is installed on the flange surface of the paint mist separation introduction area 42 and the exhaust purification area 44. When the compressed air 432 is not passed into the pneumatic seal 431, the sealing surface of the pneumatic seal 431 and the dry paint mist filter 47 has A certain gap exists between the two parts. When compressed air 432 at a certain pressure is introduced, the pneumatic seal 431 expands and contacts the sealing surface of the dry paint mist filter 47, deforming and gradually tightening. The sealing device 43 is provided with a pneumatic seal pressure relief device 431. The pneumatic seal pressure relief device 431 releases pressure, unsealing the sealing surfaces of the dry paint mist filter 471 to be replaced and the paint mist separation inlet area 42 and the exhaust purification area 44. By controlling the pressure of the compressed air, the deformation of the pneumatic seal can be controlled, improving the sealing effect. Sensors can also be used to detect the pressure and flow within the pneumatic seal to achieve real-time monitoring of the seal. When the pressure and flow changes exceed the rated range, an alarm can be issued to avoid the risk of air leakage due to poor sealing.

[0041] The dry paint mist separator 47 further includes a weighing device 45, which includes a plurality of weighing sensors 451 installed within the dry paint mist separator 4. Bottom-loaded wheels 453 are mounted on the upper ends of the weighing sensors 451. The bottom-loaded wheels 453 abut against the bottom of the dry paint mist filter 47. Side guide wheels 452 are provided along the longitudinal direction of the horizontal surface of the dry paint mist filter 47. The side guide wheels 452 abut against the dry paint mist filter 47. The dry paint mist filter 47 is placed on the bottom-loaded wheels 453 of the weighing device 45. In-situ weighing of the dry paint mist filter 47 is achieved through the weighing sensors 451 installed at the bottom of the weighing device 45. This in-situ weighing enables real-time analysis of the weight of overspray paint mist adsorbed by the dry paint mist filter 47.

[0042] The replacement device is also included. The replacement device includes a carrier 5 installed in the dry paint mist separation device 4. The carrier 5 includes an empty carrier 51 and a replacement carrier 52. A new dry paint mist filter 472 is placed on the replacement carrier 52. The dry paint mist filter 47 installed in the dry paint mist separation device 4 is a dry paint mist filter 471 that has absorbed paint mist. After the dry paint mist filter 47 absorbs overspray mist and reaches saturation, an alarm is issued to notify the operator or the automatic replacement device to perform a replacement operation. Before the replacement, two carriers 5 run simultaneously to both sides of the dry paint mist filter 471 that has absorbed paint mist to be replaced. One of the carriers is an empty carrier 51, and the other carrier 52 is equipped with a new dry paint mist filter 472. The carriers 5 can be manual carts or automatic guided vehicles (AGVs). After the carrier 5 is in place, the pneumatic seal 431 of the sealing device 43 is depressurized, so that the dry paint mist filter 471 to be replaced, which has absorbed paint mist, is unsealed from the sealing surfaces of the paint mist separation introduction area 42 and the exhaust purification area 44. Subsequently, the new dry paint mist filter 472 is slid along the horizontal plane X direction manually or automatically. When the new dry paint mist filter 472 moves into place, the dry paint mist filter 471 to be replaced, which has absorbed paint mist, is also simultaneously pushed out onto the empty carrier 51, realizing the rapid and continuous replacement of the dry paint mist filter. During the replacement process, the dry paint mist filter 47 is guided in the horizontal plane Y direction by the side guide 452 installed on the side of the weighing device 45. After the replacement is completed, the pneumatic seal 431 of the sealing device 43 is automatically pressurized, so that the newly replaced dry paint mist filter 472 is sealed from the sealing surfaces of the paint mist separation introduction area 42 and the exhaust purification area 44. During the continuous replacement on both sides, a very small gap is always maintained between the dry paint mist filter 47 and the sealing surfaces of the paint mist separation introduction area 42 and the exhaust purification area 44, and the exhaust exposure is almost negligible.

[0043] The replacement operation can also be completed unilaterally. First, the empty carrier 51 is transported to its designated location, and the pneumatic seal 431 of the sealing device 43 is depressurized, unsealing the sealing surfaces of the dry paint mist filter 471 to be replaced after adsorbing paint mist from the paint mist separation and inlet area 42 and the exhaust purification area 44. The dry paint mist filter 471 to be replaced is then pulled out along the horizontal plane X direction onto the empty carrier 51 and then transported to the waste paint mist filter storage area. The replacement carrier 52 carrying the new dry paint mist filter 472 is then transported to its designated location, and the new dry paint mist filter 472 is pushed along the horizontal plane X direction into the overspray paint mist purification area, enabling rapid, intermittent replacement of the dry paint mist filter. After replacement is in place, the pneumatic seal 431 of the sealing device 43 is automatically pressurized, sealing the newly replaced dry paint mist filter 472 with the sealing surfaces of the paint mist separation and inlet area 42 and the exhaust purification area 44. During intermittent replacement, there is a short period of exhaust exposure between the time when the dry paint mist filter 471 to be replaced is pulled out after absorbing paint mist and the time when the new dry paint mist filter 472 is pushed in. However, the exhaust exposure is not in the same direction as the replacement operation area and is farther away, making the operation environment more friendly.

[0044] In summary, the present invention has the following advantages over the current paint mist separation technology:

[0045] 1. The inlet airflow direction of the dry paint mist filter is consistent with the exhaust direction of the workpiece after spraying. The airflow containing overspray mist can enter the dry paint mist filter evenly and stably and be adsorbed, giving the dry paint mist filter the largest adsorption area and purification efficiency. The stable airflow can also reduce contamination of the flow channel and shorten the manual maintenance cycle.

[0046] 2. After the dry paint mist filter is saturated, it can be quickly and continuously replaced on both sides for transportation. The replacement time is short, and the exhaust exposure direction is far away from the replacement operation area, so the exhaust exposure is almost negligible.

[0047] 3. The transport vehicle can be a manual transport vehicle or an AGV for automatic replacement and transportation. It can be transported on one side or on both sides.

[0048] 4. The dry paint mist filter and ventilation interface are sealed with an active pneumatic seal. This seal improves sealing effectiveness by controlling compressed air pressure to change the deformation of the sealing strip. Sensors detect pressure and flow within the pneumatic seal, enabling real-time monitoring of the seal and eliminating the risk of leaks.

[0049] 5. The dry paint mist filter can be weighed on site using a weighing device, realizing real-time analysis of the weight of adsorbed paint residue.

[0050] Reference Figure 5As shown, it also includes an air source processing and detection unit, a distribution and control unit and multiple sealing devices. The air source processing and detection unit and the distribution and control unit are connected, and the distribution and control unit is connected to multiple sealing devices. Multiple sealing devices 43 share one or more sets of air source processing and detection units, distribution and control units and other devices to realize the detection and distribution control of compressed air. Among them, there are multiple sealing devices 43, including sealing device 1, sealing device 2 and sealing device n, where n is a natural number.

[0051] The utility model also discloses a system for purifying exhaust air from spraying a workpiece, comprising a spraying area 1 in a spraying room 11, a sprayer 12 installed in the spraying room, a workpiece 2 arranged in the spraying room, an operating platform 13 installed in the spraying room, a conveyor 3 installed on the operating platform 13, and the workpiece 2 placed on the conveyor 3;

[0052] Reference Figure 6 As shown, the dry paint mist filter 47 and the ventilation interface, that is, the paint mist separation introduction area 42 and the exhaust purification area 44 are sealed with a sealing device 43. An active pneumatic sealing sealing device 43 is provided between the dry paint mist filter 47 and the paint mist separation introduction area 42 and the exhaust purification area 44. Flanges are installed on the paint mist separation introduction area 42 and the exhaust purification area 44. The sealing device 43 is installed on the flanges of the paint mist separation introduction area 42 and the exhaust purification area 44. The exhaust direction can also be set on the lower end side of the dry paint mist filter 47;

[0053] Reference Figure 7 As shown, below the paint spray booth 11 is a dry paint mist separation device 4, which includes a paint mist settling area 41 fixed on a workbench 46, and two paint mist separation inlet areas 42 are installed at the bottom of the paint mist settling area 41, and an exhaust purification area 44 is provided below the paint mist separation inlet area 42. A dry paint mist filter 47 is provided between the paint mist separation inlet area 42 and the exhaust purification area 44, and the dry paint mist filter 47 and the ventilation interface, that is, the paint mist separation inlet area 42 and the exhaust purification area 44 are sealed with a sealing device 43, and an active pneumatic sealing device 43 is provided between the dry paint mist filter 47 and the paint mist separation inlet area 42 and the exhaust purification area 44, and flanges are installed on the paint mist separation inlet area 42 and the exhaust purification area 44, and the sealing device 43 is installed on the flanges of the paint mist separation inlet area 42 and the exhaust purification area 44, and an exhaust outlet is installed at the bottom of each dry paint mist filter 47.

[0054] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A device for purifying exhaust air from workpiece spraying, characterized in that: The invention comprises a dry paint mist separation device (4), wherein the air inlet direction of the dry paint mist separation device (4) is consistent with the air outlet direction of the workpiece (2) spraying, and the overspray paint mist generated after the workpiece (2) is sprayed is purified by the dry paint mist separation device (4), and the purified exhaust air is connected to the back-end process equipment through the exhaust purification area (44); The invention also includes a dry paint mist filter (47), which is placed between the paint mist separation introduction area (42) and the exhaust purification area (44). After the workpiece (2) is sprayed, the exhaust air containing oversprayed paint mist is guided to the paint mist separation introduction area (42) in the paint mist settling area (41), and evenly enters the dry paint mist filter (47) through the paint mist separation introduction area (42); and also includes a weighing device (45), which includes a plurality of weighing sensors (451) installed in the dry paint mist separation device (4), and the upper end of the weighing sensor (451) is equipped with a bottom load-bearing wheel (453), and the bottom load-bearing wheel (453) is against the bottom of the dry paint mist filter (47).

2. The device for purifying exhaust air from workpiece spraying according to claim 1, characterized in that: The invention comprises an air source processing and detection unit, a distribution and control unit and a plurality of sealing devices, wherein the air source processing and detection unit and the distribution and control unit are connected, and the distribution and control unit is connected to the plurality of sealing devices, and the plurality of sealing devices (43) share one or more sets of air source processing and detection units and distribution and control unit devices, thereby realizing the detection and distribution control of compressed air.

3. The device for purifying exhaust air during workpiece spraying according to claim 1, characterized in that: The invention also includes a sealing device (43), wherein the sealing device (43) uses a pneumatic seal (431) driven by compressed air (432) to achieve sealing and unsealing of the dry paint mist filter (47) and the paint mist separation introduction area (42) and the exhaust purification area (44). When the compressed air (432) is not introduced into the pneumatic seal (431), there is a gap between the pneumatic seal (431) and the sealing surface of the dry paint mist filter (47). When the compressed air (432) is introduced, the pneumatic seal (431) expands and contacts the sealing surface of the dry paint mist filter (47), and then deforms and is gradually compressed.

4. The device for purifying exhaust air during workpiece spraying according to claim 3, characterized in that: The sealing device (43) is installed on the flange surfaces of the paint mist separation introduction area (42) and the exhaust purification area (44).

5. The device for purifying exhaust air during workpiece spraying according to claim 1, characterized in that: The invention also includes a replacement device, which includes a carrier (5) arranged in the dry paint mist separation device (4), and the carrier (5) includes an empty carrier (51) and a replacement carrier (52), and a new dry paint mist filter (472) is placed on the replacement carrier (52).

6. The device for purifying exhaust air during workpiece spraying according to claim 1, characterized in that: The dry paint mist filter (47) installed in the dry paint mist separation device (4) is a dry paint mist filter (471) after adsorbing the paint mist.

7. The device for purifying exhaust air during workpiece spraying according to claim 1, characterized in that: The horizontal surface of the dry paint mist filter (47) is provided with a side guide wheel (452) along the longitudinal direction, and the side guide wheel (452) is arranged to abut against the dry paint mist filter (47).

8. A system for purifying exhaust air from spraying workpieces, used in the device according to any one of claims 1 to 7, characterized in that: The invention comprises a painting area (1) in a painting room (11), a sprayer (12) is installed in the painting room, a workpiece (2) is provided in the painting room, an operating platform (13) is installed in the painting room, a conveyor (3) is installed on the operating platform (13), and the workpiece (2) is placed on the conveyor (3).

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