Electrostatic spraying coating equipment

Abstract

The invention discloses electrostatic spraying coating equipment, and relates to the technical field of electrostatic spraying, the electrostatic spraying coating equipment comprises an equipment main body, a first placing rack and a second placing rack are fixedly connected to the side wall of the equipment main body, a connecting pipe is wound on the first placing rack, and a spray gun is fixedly connected to the end part of the connecting pipe; a fixing rod is fixedly connected to the side wall of the spray gun, a guide groove is formed in the fixing rod, a guide rod is slidably connected into the guide groove in a sleeved mode, and a fixing block is fixedly connected to the bottom face of the guide rod. The coating quality is guaranteed, the requirement for coating personnel is lowered, meanwhile, the optimal distance between the spray gun and the workpiece can be automatically adjusted according to the size of the workpiece, spraying can be conducted without manual measurement, time and labor are saved, spraying efficiency is guaranteed, and the distance can be kept through the guide rod.

Description

Technical Field

[0001] The invention relates to the technical field of electrostatic spraying, in particular to an electrostatic spraying coating device. Background Art

[0002] In the electrostatic spraying process, the distance between the spray gun and the workpiece is a key parameter. To ensure the coating effect and safety, the spray gun distance needs to be adjusted according to the size and type of the workpiece, specifically: General workpiece: The optimal distance between the spray gun and the workpiece is usually controlled between 150-300mm. A distance that is too close may cause a short circuit or coating breakdown, while a distance that is too far will make it difficult to apply powder, affecting the coating efficiency; Small workpiece: The spray gun distance can be appropriately lowered, usually recommended to be between 100-200mm. This distance helps to obtain a wetter, darker and thicker coating, but it still needs to be kept within a safe range to ensure uniform coating and avoid spark discharge; Large workpiece: For larger workpieces, the spray gun distance can be appropriately increased, but should not exceed 350mm to ensure the adhesion rate of paint mist and the coating effect.

[0003] The above-mentioned small workpieces, large workpieces and general workpieces are specifically as follows: Small workpieces: small in size and light in weight, can be held in hand or easily placed on the desktop, convenient to carry and use; Large workpieces: large in size and heavy in weight, requiring large equipment for processing and production, and special transportation tools for handling and installation; General workpieces: usually refers to workpieces with medium size, weight and purpose, without specific definition standards, relative to small and large workpieces.

[0004] After searching, Chinese patent publication number CN103817054A discloses electrostatic spray coating equipment. Although the powder can be fully gas-solid mixed in advance to fully break up the large particles of powder into small particles of powder, thereby improving the spraying quality, during the spraying process, the spray gun should be perpendicular to the surface of the workpiece and maintain a uniform moving speed to ensure the uniformity of the coating. The handheld coating equipment controls the spray gun manually, which makes it impossible for the spray gun to meet the above requirements. Not only does it affect the coating quality, but it also tests the skills of the coating personnel. At the same time, it is impossible to automatically adjust the optimal distance between the spray gun and the workpiece according to the size of the workpiece. Manual measurement is required before spraying, which is not only time-consuming and labor-intensive, affecting the spraying efficiency, but also difficult to manually maintain the distance. Summary of the invention

[0005] The object of the present invention is to provide an electrostatic spraying coating device.

[0006] In order to solve the problems raised in the above-mentioned background technology, the present invention provides the following technical solutions: an electrostatic spray coating equipment, comprising an equipment body, a first placement rack and a second placement rack are fixedly connected to the side wall of the equipment body, a connecting pipe is wound on the first placement rack, an end of the connecting pipe is fixedly connected to a spray gun, a fixing rod is fixedly connected to the side wall of the spray gun, a guide groove is opened on the fixing rod, a guide rod is slidably sleeved in the guide groove, a fixing block is fixedly connected to the bottom surface of the guide rod, a first contact wheel and a second contact wheel are hingedly connected to one end of the guide rod, an end of a piston rod is fixedly connected to the other end of the guide rod, a fixing cylinder is slidably sleeved on the other end of the piston rod, an end surface of the fixing cylinder is connected to one end of a main conduit, the other end of the main conduit is connected to an air bag, and the outer surface of the main conduit is connected to a branch conduit;

[0007] A motor is installed at the bottom end of the spray gun, and a first worm is fixedly connected to the output end of the motor, and the outer surface of the first worm is meshedly connected to the first worm wheel, and a sleeve is fixedly sleeved on the central axis of the first worm wheel, and one end of a connecting rod is fixedly connected to the outer surface of the sleeve, and a planetary bevel gear is rotatably sleeved on the other end of the connecting rod, and the outer surface of the planetary bevel gear is meshedly connected to the first transmission bevel gear and the second transmission bevel gear, the second worm is fixedly connected to the central axis of the first transmission bevel gear, and the outer surface of the second worm is meshedly connected to the second worm wheel, and one end of a rotating shaft is fixedly connected to the central axis of the second worm wheel, and the other end of the rotating shaft is fixedly sleeved with a driving bevel gear, and the outer surface of the driving bevel gear is meshedly connected with a driven bevel gear, and a screw is fixedly connected to the central axis of the driven bevel gear, and the screw is meshed and sleeved with a fixed block.

[0008] As a further solution of the present invention: the cross-section of the guide groove is arranged in a Chinese-character shape, the first contact wheel and the second contact wheel are arranged side by side, the piston rod is slidably sleeved in the guide groove, the fixed cylinder is fixedly sleeved in the fixed rod, and the main pipe is fixedly sleeved in the side wall of the spray gun.

[0009] As a further solution of the present invention: the branch conduit is fixedly sleeved with the side wall of the spray gun, the airbag blocks the nozzle of the spray gun, the airbag begins to shrink when the extended length of the piston rod reaches 100mm, and the fixed block is slidably sleeved with the bottom end of the fixed rod.

[0010] As a further solution of the present invention: the first worm, the first worm wheel, the connecting rod and the planetary bevel gear are all rotatably connected to the bottom end of the spray gun, the second worm and the rotating shaft are all rotatably connected to the spray gun, and the screw is rotatably connected to the bottom end of the fixed rod.

[0011] As a further solution of the present invention: the connecting rod is arranged in a U shape, and the rotating shaft drives the fixed block and the guide rod to move through the driving bevel gear, the driven bevel gear and the screw rod.

[0012] As a further solution of the present invention: a third worm is fixedly connected to the central axis of the second transmission bevel gear, a groove is provided on the outer surface of the third worm, and a fixing ring is provided on the outer sleeve of the third worm, an inner cavity is provided on the inner surface of the fixing ring, and an insert is slidably sleeved in the inner cavity, the outer surface of the third worm is meshedly connected with a third worm wheel, one end of the transmission shaft is fixedly connected to the central axis of the third worm wheel, a driving gear is fixedly connected to the other end of the transmission shaft, racks are meshedly connected on both sides of the driving gear, and a clamping block is fixedly connected to the bottom surface of the rack.

[0013] As a further solution of the present invention: the embedding block is embedded in the embedding groove, there are multiple embedding grooves, and the multiple embedding grooves are evenly distributed about the central axis of the third worm, the bottom end of the branch guide tube is connected to the inner cavity, the third worm is rotatably connected to the sleeve, and the third worm is rotatably connected to the bottom end of the spray gun, and the fixed ring is fixedly connected to the bottom end of the spray gun.

[0014] As a further solution of the present invention: the transmission shaft extends outside the spray gun, the rack is slidably connected to the bottom surface of the spray gun, two racks and two clamps are provided, and the two racks and two clamps are symmetrically distributed about the central axis of the transmission shaft.

[0015] Adopting the above technical solution: Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. The first contact wheel and the second contact wheel of the present invention are always in close contact with the surface of the workpiece. Since the first contact wheel and the second contact wheel are placed side by side, when the surface of the workpiece is undulating, the line connecting the contact points of the first contact wheel and the second contact wheel with the surface of the workpiece is the secant segment, and the guide rod is located on the perpendicular bisector of the secant segment. At the same time, the perpendicular bisector of the secant segment must pass through the center of the circle, so that the direction of the guide rod is always perpendicular to the tangent plane of the arc surface, and the guide rod is parallel to the nozzle of the spray gun, thereby avoiding the nozzle of the spray gun from tilting with the arc surface, thereby ensuring the uniformity of the coating. Even a handheld spray gun can meet the spraying requirements, which not only ensures the coating quality but also reduces the requirements for the coating personnel.

[0017] 2. The present invention drives the third worm gear to rotate by the third worm on the second transmission bevel gear, so that the transmission shaft on the third worm gear drives the driving gear to rotate by itself, so that the driving gear drives the racks on both sides thereof to move toward each other, so that the clamping blocks on the racks are opened until the spacing between the clamping blocks is the same as the length of the workpiece. At this time, the motor is stopped, so that the translation of the guide rod and the measurement of the workpiece are synchronized, and the optimal distance between the spray gun and the workpiece can be automatically adjusted according to the size of the workpiece. There is no need to manually measure before spraying, which not only saves time and effort and ensures spraying efficiency, but also can maintain the distance through the guide rod.

[0018] 3. The present invention fully compresses the air in the fixed cylinder by the piston rod on the guide rod, so that the main conduit connected to the fixed cylinder introduces the compressed air into the airbag, so that the airbag expands and fully blocks the nozzle of the spray gun. At the same time, the branch conduit connected to the main conduit also introduces a part of the compressed air into the inner cavity, so that the air in the inner cavity expands, so that the embedded block in the inner cavity extends out of the inner cavity and engages with the embedded groove, so that the fixed collar positions the third worm and the second transmission bevel gear, thereby indirectly restricting the movement of the rack and the clamping block. At this time, the planetary bevel gear rotates while revolving, which does not affect the planetary bevel gear driving the first transmission bevel gear to rotate, thereby not affecting the movement of the guide rod. As the guide rod continues to move, the guide rod drives the piston rod to return, so that the fixed cylinder sucks back the air, thereby gradually releasing the blockage of the nozzle and the fixation of the rack. At this time, the vertical spacing between the first contact wheel and the second contact wheel on the guide rod and the nozzle of the spray gun is 100 mm, that is, the shortest spacing for spraying small workpieces, so as to achieve the purpose of easy storage, while also avoiding the accidental spraying of powder, so that the coating is not penetrated due to too close distance, and the function of automatic locking is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of an electrostatic spray coating device of the present invention;

[0020] Figure 2 This is a schematic diagram of the connecting pipe structure in an embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of the spray gun structure in an embodiment of the present invention;

[0022] Figure 4 This is a schematic diagram of the main pipe structure in an embodiment of the present invention;

[0023] Figure 5 In the embodiment of the present invention Figure 4 A magnified view of the structure of part A;

[0024] Figure 6 In the embodiment of the present invention Figure 4 A magnified view of the structure of part B;

[0025] Figure 7 This is a schematic diagram of the casing structure in an embodiment of the present invention;

[0026] Figure 8 A half-section schematic diagram of a fixed collar structure in an embodiment of the present invention;

[0027] Fig. 9 In the embodiment of the present invention Figure 2 Enlarged view of the structure of part C in the middle.

[0028] In the figure: 1, equipment main body; 2, first placing rack; 3, second placing rack; 4, connecting pipe; 5, spray gun; 6, fixing rod; 7, guide groove; 8, guide rod; 9, first contact wheel; 10, second contact wheel; 11, fixing block; 12, piston rod; 13, fixing cylinder; 14, main conduit; 15, airbag; 16, branch conduit; 17, motor; 18, first worm; 19, first worm gear; 20, sleeve; 21, connecting rod; 22, planetary bevel gear; 23, first driving bevel gear; 24, second driving bevel gear; 25, second worm; 26, second worm gear; 27, rotating shaft; 28, driving bevel gear; 29, driven bevel gear; 30, lead screw; 31, third worm; 32, embedding groove; 33, fixing collar; 34, inner cavity; 35, embedding block; 36, third worm gear; 37, transmission shaft; 38, driving gear; 39, rack; 40, clamping block. Detailed implementation manners

[0029] The following further explains the detailed implementation manners of the present invention with reference to the accompanying drawings. It should be noted here that the explanations of these implementation manners are used to help understand the present invention, but do not constitute a limitation to the present invention. In addition, the technical features involved in the various implementation manners of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0030] Embodiment 1

[0031] Please refer to Figure 1-Figure 4 , the present invention provides a technical solution: an electrostatic spraying and painting equipment, including an equipment main body 1, a first placing rack 2 and a second placing rack 3 are fixedly connected to the side wall of the equipment main body 1, a connecting pipe 4 is wound on the first placing rack 2, a spray gun 5 is fixedly connected to the end of the connecting pipe 4, a fixing rod 6 is fixedly connected to the side wall of the spray gun 5, a guide groove 7 is opened on the fixing rod 6, a guide rod 8 is slidably sleeved in the guide groove 7, a fixing block 11 is fixedly connected to the bottom surface of the guide rod 8, one end of the guide rod 8 is hinged with a first contact wheel 9 and a second contact wheel 10, the other end of the guide rod 8 is fixedly connected to one end of a piston rod 12, the other end of the piston rod 12 is slidably sleeved in a fixing cylinder 13, one end of a main conduit 14 is communicated with the end surface of the fixing cylinder 13, the other end of the main conduit 14 is communicated with an airbag 15, and a branch conduit 16 is communicated with the outer surface of the main conduit 14.

[0032] Please refer to Figure 3 , Figure 4 and Figure 6 , the cross-section of the guide groove 7 is arranged in a middle character shape, the first contact wheel 9 and the second contact wheel 10 are arranged side by side, the piston rod 12 is slidably sleeved in the guide groove 7, the fixing cylinder 13 is fixedly sleeved on the fixing rod 6, and the main conduit 14 is fixedly sleeved on the side wall of the spray gun 5.

[0033] Please refer to Figure 2 , and Figure 4The branch conduit 16 is fixedly sleeved with the side wall of the spray gun 5, the air bag 15 blocks the nozzle of the spray gun 5, and when the extended length of the piston rod 12 reaches 100mm, the air bag 15 begins to shrink, and the fixed block 11 is slidably sleeved with the bottom end of the fixed rod 6.

[0034] Specifically, during the electrostatic spraying process, after the extension length of the guide rod 8 is determined, the screw rod 30 can fix the guide rod 8 due to its self-locking property to prevent the guide rod 8 from being compressed and retracted. At this time, the nozzle of the spray gun 5 is aimed at the workpiece, and then the first contact wheel 9 and the second contact wheel 10 on the guide rod 8 are pressed against the surface of the workpiece. At this time, the spray gun 5 is opened to complete the electrostatic spraying. In this process, it is ensured that the first contact wheel 9 and the second contact wheel 10 are always pressed against the surface of the workpiece. Because the first contact wheel 9 and the second contact wheel 10 are placed side by side, when the surface of the workpiece is undulating, the line connecting the first contact wheel 9 and the second contact wheel 10 and the contact point on the workpiece surface is the secant segment, and the guide rod 8 is located on the perpendicular bisector of the secant segment. At the same time, the perpendicular bisector of the secant segment must pass through the center of the circle, so that the direction of the guide rod 8 is always perpendicular to the tangent plane of the arc surface, and the guide rod 8 is parallel to the nozzle of the spray gun 5, thereby avoiding the nozzle of the spray gun 5 from tilting with the arc surface, thereby ensuring the uniformity of the coating. Even a handheld spray gun 5 can meet the spraying requirements, which not only ensures the coating quality, but also reduces the requirements of the coating personnel.

[0035] Example 2

[0036] See also Figure 2-Figure 7 and Fig. 9 The present invention provides a technical solution: an electrostatic spray coating device, a motor 17 is installed at the bottom end of the spray gun 5, a first worm 18 is fixedly connected to the output end of the motor 17, the outer surface of the first worm 18 is meshedly connected to the first worm wheel 19, a sleeve 20 is fixedly sleeved on the central axis of the first worm wheel 19, one end of a connecting rod 21 is fixedly connected to the outer surface of the sleeve 20, a planetary bevel gear 22 is rotatably sleeved on the other end of the connecting rod 21, and the outer surface of the planetary bevel gear 22 is meshedly connected to the first transmission bevel gear 21. The gear 23 and the second transmission bevel gear 24, the second worm 25 is fixedly connected to the central axis of the first transmission bevel gear 23, the outer surface of the second worm 25 is meshedly connected to the second worm wheel 26, one end of the rotating shaft 27 is fixedly connected to the central axis of the second worm wheel 26, the other end of the rotating shaft 27 is fixedly sleeved with a driving bevel gear 28, the outer surface of the driving bevel gear 28 is meshedly connected with a driven bevel gear 29, the central axis of the driven bevel gear 29 is fixedly connected with a screw rod 30, and the screw rod 30 is meshedly sleeved with the fixed block 11.

[0037] See also Figure 3 , Figure 4 , Figure 6 and Fig. 9The first worm 18, the first worm wheel 19, the connecting rod 21 and the planetary bevel gear 22 are all rotatably connected to the bottom end of the spray gun 5, the second worm 25 and the rotating shaft 27 are all rotatably connected to the spray gun 5, and the screw 30 is rotatably connected to the bottom end of the fixed rod 6.

[0038] See also Figure 5 and Figure 6 The connecting rod 21 is arranged in a U shape, and the rotating shaft 27 drives the fixed block 11 and the guide rod 8 to move through the driving bevel gear 28, the driven bevel gear 29 and the screw rod 30.

[0039] Specifically, in the process of adjusting the optimal distance between the spray gun 5 and the workpiece, the bottom surface of the spray gun 5 is brought into contact with the surface of the workpiece, and the motor 17 is started again at this time, so that the motor 17 drives the first worm gear 19 to rotate through the first worm 18, so that the sleeve 20 on the first worm gear 19 drives the planetary bevel gear 22 to revolve through the connecting rod 21, so that the planetary bevel gear 22 drives the first transmission bevel gear 23 and the second transmission bevel gear 24 to rotate, so that the second worm 25 on the first transmission bevel gear 23 drives the second worm gear 26 to rotate, and then the rotating shaft 27 on the second worm gear 26 drives the active bevel gear 28 to rotate, so that the driven bevel gear 29 meshing with the active bevel gear 28 drives the screw rod 30 to rotate, and the fixed block 11 on the screw rod 30 is limited by the fixed rod 6 and cannot rotate, so that the fixed block 11 is translated under the drive of the screw rod 30, and further the fixed block 11 on the fixed block 11 The guide rod 8 translates, so that the guide rod 8 extends out of the fixed rod 6, so that the first contact wheel 9 and the second contact wheel 10 on the guide rod 8 are vertically spaced from the port of the spray gun 5; while the above process is being carried out, with the rotation of the second transmission bevel gear 24, the third worm 31 on the second transmission bevel gear 24 drives the third worm wheel 36 to rotate, so that the transmission shaft 37 on the third worm wheel 36 drives the driving gear 38 to rotate, so that the driving gear 38 drives the racks 39 on both sides thereof to move toward each other, so that the clamping block 40 on the rack 39 is opened until the spacing of the clamping block 40 is the same as the length of the workpiece, at this time, the motor 17 is stopped, so that the translation of the guide rod 8 and the measurement of the workpiece are synchronized, and the optimal distance between the spray gun 5 and the workpiece can be automatically adjusted according to the size of the workpiece, without the need for manual measurement before spraying, which not only saves time and effort and ensures the spraying efficiency, but also can maintain the distance through the guide rod 8.

[0040] Example 3

[0041] See also Figure 4 and Figure 5-Figure 8The present invention provides a technical solution: an electrostatic spray coating equipment, a third worm 31 is fixedly connected to the central axis of the second transmission bevel gear 24, an embedding groove 32 is provided on the outer surface of the third worm 31, and a fixing ring 33 is provided on the outer sleeve of the third worm 31, an inner cavity 34 is provided on the inner surface of the fixing ring 33, an embedding block 35 is slidably sleeved in the inner cavity 34, a third worm wheel 36 is meshedly connected to the outer surface of the third worm 31, one end of a transmission shaft 37 is fixedly connected to the central axis of the third worm wheel 36, a driving gear 38 is fixedly connected to the other end of the transmission shaft 37, racks 39 are meshedly connected on both sides of the driving gear 38, and a clamping block 40 is fixedly connected to the bottom surface of the rack 39.

[0042] See also Figure 7 and Figure 8 The embedding block 35 is embedded in the embedding groove 32, a plurality of embedding grooves 32 are provided, and the plurality of embedding grooves 32 are evenly distributed about the central axis of the third worm 31, the bottom end of the branch guide tube 16 is connected with the inner cavity 34, the third worm 31 is rotatably connected with the sleeve 20, and the third worm 31 is rotatably connected with the bottom end of the spray gun 5, and the fixed collar 33 is fixedly connected with the bottom end of the spray gun 5.

[0043] See also Figure 2 and Figure 5 The transmission shaft 37 extends outside the spray gun 5 , the rack 39 is slidably connected to the bottom surface of the spray gun 5 , two racks 39 and two clamps 40 are provided, and the two racks 39 and the two clamps 40 are symmetrically distributed about the central axis of the transmission shaft 37 .

[0044] Specifically, at the initial stage of taking the spray gun 5, the guide rod 8 is completely retracted into the guide groove 7, so that the piston rod 12 on the guide rod 8 fully compresses the air in the fixed cylinder 13, so that the main conduit 14 connected to the fixed cylinder 13 introduces the compressed air into the airbag 15, so that the airbag 15 expands and fully blocks the nozzle of the spray gun 5. At the same time, the branch conduit 16 connected to the main conduit 14 also introduces a part of the compressed air into the inner cavity 34, so that the air in the inner cavity 34 expands, so that the embedded block 35 in the inner cavity 34 extends out of the inner cavity 34 and engages with the embedded groove 32, so that the fixed collar 33 positions the third worm 31 and the second transmission bevel gear 24, thereby indirectly limiting the gear The movement of the rack 39 and the clamping block 40, at this time, the planetary bevel gear 22 rotates while revolving, which does not affect the planetary bevel gear 22 driving the first transmission bevel gear 23 to rotate, thereby not affecting the movement of the guide rod 8. As the guide rod 8 continues to move, the guide rod 8 drives the piston rod 12 to return, so that the fixed cylinder 13 sucks back air, thereby gradually releasing the blockage of the nozzle and the fixation of the rack 39. At this time, the vertical spacing between the first contact wheel 9 and the second contact wheel 10 on the guide rod 8 and the nozzle of the spray gun 5 is 100mm, that is, the shortest spacing for spraying small workpieces, so as to achieve the purpose of facilitating storage, while also avoiding accidental spraying of powder, so that the coating is not penetrated due to too close distance, and the function of automatic locking is increased.

[0045] The working principle and use process of the present invention are as follows: when electrostatic spraying of a workpiece is required, the equipment body 1 is moved to a designated position, and then the connecting pipe 4 is connected to the equipment body 1. At this time, the spray gun 5 is manually held, and the bottom surface of the spray gun 5 is brought into contact with the surface of the workpiece. At this time, the motor 17 is started again, so that the motor 17 drives the first worm gear 19 to rotate through the first worm 18, so that the sleeve 20 on the first worm gear 19 drives the planetary bevel gear 22 to revolve through the connecting rod 21, so that the planetary bevel gear 22 drives the first transmission bevel gear 23 and the second transmission bevel gear 24 to rotate, so that the first transmission bevel gear 18 drives the first worm gear 19 to rotate. The second worm 25 on the wheel 23 drives the second worm wheel 26 to rotate, and then the rotating shaft 27 on the second worm wheel 26 drives the active bevel gear 28 to rotate, so that the driven bevel gear 29 meshing with the active bevel gear 28 drives the screw rod 30 to rotate, and the fixed block 11 on the screw rod 30 is limited by the fixed rod 6 and cannot rotate, so that the fixed block 11 is translated under the drive of the screw rod 30, and further the guide rod 8 on the fixed block 11 is translated, so that the guide rod 8 extends out of the fixed rod 6, so that the first contact wheel 9 and the second contact wheel 10 on the guide rod 8 are vertically spaced from the port of the spray gun 5;

[0046] While the above process is being carried out, as the second transmission bevel gear 24 rotates, the third worm 31 on the second transmission bevel gear 24 drives the third worm gear 36 to rotate, so that the transmission shaft 37 on the third worm gear 36 drives the driving gear 38 to rotate, so that the driving gear 38 drives the racks 39 on both sides thereof to move toward each other, so that the clamping block 40 on the rack 39 is opened until the spacing of the clamping block 40 is the same as the length of the workpiece, at this time the motor 17 is stopped, so that the translation of the guide rod 8 and the measurement of the workpiece are synchronized, and the optimal distance between the spray gun 5 and the workpiece can be automatically adjusted according to the size of the workpiece, without the need for manual measurement before spraying, which not only saves time and effort and ensures the spraying efficiency, but also can maintain the distance through the guide rod 8;

[0047] It should be further explained that, at the initial stage of taking the spray gun 5, the guide rod 8 is completely retracted into the guide groove 7, so that the piston rod 12 on the guide rod 8 fully compresses the air in the fixed cylinder 13, so that the main conduit 14 connected with the fixed cylinder 13 introduces the compressed air into the airbag 15, so that the airbag 15 expands and fully blocks the nozzle of the spray gun 5. At the same time, the branch conduit 16 connected with the main conduit 14 also introduces a part of the compressed air into the inner cavity 34, so that the air in the inner cavity 34 expands, so that the embedded block 35 in the inner cavity 34 extends out of the inner cavity 34 and engages with the embedded groove 32, so that the fixed collar 33 positions the third worm 31 and the second transmission bevel gear 24, thereby indirectly The movement of the rack 39 and the clamp 40 is restricted. At this time, the planetary bevel gear 22 rotates while revolving, which does not affect the rotation of the first transmission bevel gear 23 driven by the planetary bevel gear 22, thereby not affecting the movement of the guide rod 8. As the guide rod 8 continues to move, the guide rod 8 drives the piston rod 12 to return, so that the fixed cylinder 13 sucks back air, thereby gradually releasing the blockage of the nozzle and the fixation of the rack 39. At this time, the vertical spacing between the first contact wheel 9 and the second contact wheel 10 on the guide rod 8 and the nozzle of the spray gun 5 is 100mm, that is, the shortest spacing for spraying small workpieces, so as to achieve the purpose of facilitating storage, and also avoid the accidental spraying of powder, so that the coating is not penetrated due to too close distance, and the function of automatic locking is added;

[0048] When the extension length of the guide rod 8 is determined, the screw rod 30 can fix the guide rod 8 due to its self-locking property to prevent the guide rod 8 from being compressed and retracted. At this time, the nozzle of the spray gun 5 is aimed at the workpiece, and then the first contact wheel 9 and the second contact wheel 10 on the guide rod 8 are pressed against the surface of the workpiece. At this time, the spray gun 5 is opened to complete the electrostatic spraying. In this process, it is ensured that the first contact wheel 9 and the second contact wheel 10 are always pressed against the surface of the workpiece. Because the first contact wheel 9 and the second contact wheel 10 are placed side by side, when the surface of the workpiece is undulating, the line connecting the first contact wheel 9 and the second contact wheel 10 and the contact point on the surface of the workpiece is the secant segment, and the guide rod 8 is located on the perpendicular bisector of the secant segment. At the same time, the perpendicular bisector of the secant segment must pass through the center of the circle, so that the direction of the guide rod 8 is always perpendicular to the tangent plane of the arc surface, and the guide rod 8 is parallel to the nozzle of the spray gun 5, thereby avoiding the nozzle of the spray gun 5 from tilting with the arc surface, thereby ensuring the uniformity of the coating. Even a handheld spray gun 5 can meet the spraying requirements, which not only ensures the coating quality, but also reduces the requirements of the coating personnel to complete the operation.

[0049] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments are made without departing from the principles and spirit of the present invention, and still fall within the scope of protection of the present invention.

Claims

1. An electrostatic spray coating equipment, characterized in that: It includes a device main body (1), on the side wall of the device main body (1), a first placement rack (2) and a second placement rack (3) are fixedly connected. A connecting pipe (4) is wound on the first placement rack (2). The end of the connecting pipe (4) is fixedly connected with a spray gun (5). A fixing rod (6) is fixedly connected to the side wall of the spray gun (5). A guide groove (7) is formed in the fixing rod (6). A guide rod (8) is slidably sleeved in the guide groove (7). The bottom surface of the guide rod (8) is fixedly connected with a fixing block (11). One end of the guide rod (8) is hinged with a first contact wheel (9) and a second contact wheel (10). The other end of the guide rod (8) is fixedly connected with one end of a piston rod (12). The other end of the piston rod (12) is slidably sleeved with a fixing cylinder (13). One end of a main conduit (14) is communicated with the end surface of the fixing cylinder (13). The other end of the main conduit (14) is communicated with an airbag (15), and a branch conduit (16) is communicated with the outer surface of the main conduit (14). A motor (17) is installed at the bottom end of the spray gun (5). A first worm (18) is fixedly connected to the output end of the motor (17). A first worm gear (19) is meshed with the outer surface of the first worm (18). A sleeve (20) is fixedly sleeved on the central axis of the first worm gear (19). One end of a connecting rod (21) is fixedly connected to the outer surface of the sleeve (20). The other end of the connecting rod (21) is rotatably sleeved with a planetary bevel gear (22). The outer surface of the planetary bevel gear (22) is meshed with a first driving bevel gear (23) and a second driving bevel gear (24). A second worm (25) is fixedly connected to the central axis of the first driving bevel gear (23). A second worm gear (26) is meshed with the outer surface of the second worm (25). One end of a rotating shaft (27) is fixedly connected to the central axis of the second worm gear (26). The other end of the rotating shaft (27) is fixedly sleeved with a driving bevel gear (28). The outer surface of the driving bevel gear (28) is meshed with a driven bevel gear (29). A lead screw (30) is fixedly connected to the central axis of the driven bevel gear (29). The lead screw (30) is meshed and sleeved with the fixing block (11).

2. The electrostatic spray coating equipment according to claim 1, characterized in that: The cross-section of the guide groove (7) is arranged in a Chinese character 'zhong' shape. The first contact wheel (9) and the second contact wheel (10) are arranged side by side. The piston rod (12) is slidably sleeved with the guide groove (7). The fixing cylinder (13) is fixedly sleeved with the fixing rod (6). The main conduit (14) is fixedly sleeved with the side wall of the spray gun (5).

3. The electrostatic spray coating equipment according to claim 1, characterized in that: The branch conduit (16) is fixedly sleeved with the side wall of the spray gun (5). The airbag (15) blocks the nozzle of the spray gun (5). When the extending length of the piston rod (12) reaches 100 mm, the airbag (15) starts to contract. The fixing block (11) is slidably sleeved with the bottom end of the fixing rod (6).

4. The electrostatic spray coating equipment according to claim 1, characterized in that: The first worm (18), the first worm wheel (19), the connecting rod (21) and the planetary bevel gear (22) are all rotatably connected to the bottom end of the spray gun (5), the second worm (25) and the rotating shaft (27) are all rotatably connected to the spray gun (5), and the screw rod (30) is rotatably connected to the bottom end of the fixed rod (6).

5. The electrostatic spray coating equipment according to claim 1, characterized in that: The connecting rod (21) is arranged in a U shape, and the rotating shaft (27) drives the fixed block (11) and the guide rod (8) to move through the driving bevel gear (28), the driven bevel gear (29) and the screw rod (30).

6. The electrostatic spray coating equipment according to claim 1, characterized in that: A third worm (31) is fixedly connected to the central axis of the second transmission bevel gear (24); an embedding groove (32) is provided on the outer surface of the third worm (31); a fixing collar (33) is provided on the outer surface of the third worm (31); an inner cavity (34) is provided on the inner surface of the fixing collar (33); an embedding block (35) is slidably sleeved in the inner cavity (34); a third worm wheel (36) is meshingly connected to the outer surface of the third worm (31); one end of a transmission shaft (37) is fixedly connected to the central axis of the third worm wheel (36); a driving gear (38) is fixedly connected to the other end of the transmission shaft (37); racks (39) are meshingly connected to both sides of the driving gear (38); a clamping block (40) is fixedly connected to the bottom surface of the rack (39).

7. The electrostatic spray coating equipment according to claim 6, characterized in that: The insert block (35) is engaged with the embedding groove (32), a plurality of embedding grooves (32) are provided, and the plurality of embedding grooves (32) are evenly distributed about the central axis of the third worm (31), the bottom end of the branch guide tube (16) is connected with the inner cavity (34), the third worm (31) is rotatably sleeved with the sleeve (20), and the third worm (31) is rotatably sleeved with the bottom end of the spray gun (5), and the fixed collar (33) is fixedly sleeved with the bottom end of the spray gun (5).

8. The electrostatic spray coating equipment according to claim 6, characterized in that: The transmission shaft (37) extends outside the spray gun (5), the rack (39) is slidably connected to the bottom surface of the spray gun (5), two racks (39) and two clamps (40) are provided, and the two racks (39) and the two clamps (40) are symmetrically distributed about the central axis of the transmission shaft (37).

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