Test piece sampling device for coating detection

Abstract

The invention relates to the technical field of coating detection, in particular to a test piece sampling device for coating detection, which comprises a base, a main shaft is rotatably arranged on the base, a bottom support is arranged on one side of the base, and a coating dropping device is arranged on the main shaft; the coating dropping device comprises a supporting rod arranged on the main shaft, a dropper located over the bottom support is arranged at one end of the supporting rod, and a dropper is arranged at the lower end of the dropper. Coating is extruded between the two glass plates, the coating is evenly distributed between the glass plates, and a flat coating is formed; the problems of adhesion and air entrainment of the coating are effectively avoided, and the uniformity and quality of the coating are ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of paint detection, and in particular to a test piece sampling device for paint detection. BACKGROUND

[0002] Paint is a material widely used in the fields of construction, industrial products, automobiles, furniture, etc., mainly for decoration, protection and special functions. The main components of paint include film-forming substances (such as resins), pigments, solvents and additives. By coating on the surface of an object, paint can form a continuous film, thereby achieving decorative effects (such as color and gloss), protective effects (such as corrosion resistance and UV protection), and special functions (such as heat insulation, fire resistance, and waterproofing).

[0003] After production, paint needs to be detected to ensure the quality, performance, safety and environmental protection of the paint product. Through scientific and accurate detection means, the performance indicators of the paint can be comprehensively evaluated, thereby ensuring its performance in actual application.

[0004] A paint detection device with publication number CN108226019A relates to the field of paint technology. The prior art includes a support, a connecting arm, a support seat and a heating device. The connecting arm is connected to the support, the support seat is connected to the support, the support seat is arranged below the connecting arm, and the heating device is arranged on the support seat. The heating device includes a container, a base, a thermal insulation layer and a heating column. The base has a groove, the thermal insulation layer is arranged in the groove, and a spacing layer is provided between the bottom of the thermal insulation layer and the container. The heating column is arranged in the spacing layer, and the two ends of the heating column abut against the thermal insulation layer and the container, respectively. The heating column includes a column body and an electric heating wire, and the electric heating wire is wound around the column body. By heating the solution in the container, the temperature of the solution can be quickly raised. At the same time, the horizontal position and height of the steel rod can be easily adjusted. In addition, the cooling of the heating device can be accelerated after the detection is completed, thereby shortening the solution processing time.

[0005] However, the above-mentioned prior art still has some defects when detecting paint: The motor rotation of the above-mentioned prior art can drive the rotation of the rotating shaft, so that the steel rod brushes the paint to achieve a more uniform effect. However, in actual application, the paint has a certain adhesion. During the forward rolling of the steel rod, the paint behind the steel rod will be brought up due to the adhesion of the paint, and then be pulled apart with the rolling of the steel rod. The pulled-apart paint will randomly break and re-deposit on the surface, causing uneven brushing thickness, resulting in thickness differences on the coating surface, and even local accumulation or absence.

[0006] Meanwhile, when the steel rod rolls forward, a low pressure area is formed in front of the movement track of the steel rod, and the surrounding air fills the low pressure area quickly, since the paint has certain viscosity and fluidity, the air cannot escape quickly, but is rolled into the paint, the air rolled in forms bubbles in the paint, the bubbles are taken to the painting path along with the rolling of the steel rod, since the bubbles exist, irregular gaps are formed in the painted layer, the bubbles not only destroy the uniformity of the paint layer, but also cause the uneven phenomenon on the surface of the paint layer, thereby affecting the contact result.

[0007] Based on this, in the light of the above-mentioned points, the existing technology still has room for improvement in the way of paint detection. SUMMARY

[0008] In order to solve the above technical problems, the present application provides a test piece sampling device for paint detection, which adopts the following technical scheme: A test piece sampling device for paint detection, comprising a base, a main shaft rotatably arranged on the base, a bottom support arranged on one side of the base, and a paint dropper arranged on the main shaft; The paint dropper comprises a support rod arranged on the main shaft, a dropper tube arranged at one end of the support rod and located directly above the bottom support, and a dripping head arranged at the lower end of the dropper tube.

[0009] Preferably, the paint dropper further comprises a piston slidably arranged in the dropper tube, a liquid inlet pipe arranged on the dropper tube and located on one side of the piston, a reciprocating screw slidably arranged in the dropper tube, a connecting rod arranged on the reciprocating screw and connected with the piston, and a drive gear rotatably arranged on the dropper tube and threadedly connected with the reciprocating screw.

[0010] Preferably, the connecting rod is slidably connected with the reciprocating screw, a return spring is arranged between the reciprocating screw and the piston, and an adjusting knob is threadedly connected with the connecting rod and located above the reciprocating screw.

[0011] Preferably, the dripping head is provided with a dripping hole at the bottom, a plurality of flow-through holes are circumferentially arranged in the dripping head and communicate with the dripping hole, and a sealing plug is slidably arranged in the dripping head.

[0012] Preferably, the sealing plug is provided with a contact spring at the bottom.

[0013] Preferably, a storage groove is arranged on the main shaft, one end of the liquid inlet pipe penetrates into the storage groove, and a detachable storage cover is arranged at the upper end of the storage groove.

[0014] Preferably, a one-way valve is arranged on the liquid inlet pipe.

[0015] Preferably, the base support comprises a base plate arranged on one side of the base, and a plurality of through holes are arranged in an array on the base plate.

[0016] Preferably, the lower end of the base plate is provided with a detachable recycling cover.

[0017] Preferably, the base is provided with a driving member. The driving member comprises a transmission gear arranged on the main shaft and located at the lower end of the base, and the base is provided with an incomplete gear engaged with the transmission gear.

[0018] In summary, the present application has at least one of the following beneficial technical effects: 1. By extruding the coating between the two glass plates, the coating is evenly distributed between the glass plates to form a flat coating layer, effectively avoiding the problems of coating adhesion and air entrainment, and ensuring the uniformity and quality of the coating.

[0019] 2. By rotating the adjusting screw, the adjusting screw will cooperate with the threads of the base plate to control the gap between the two glass plates when the vacuum chuck drives the second glass plate to press on the first glass plate, and the back-shaped pad will lift the vacuum chuck by a certain gap, thereby controlling the thickness of the coating sheet.

[0020] 3. When the vacuum chuck presses the second glass plate on the first glass plate, a sealed area is formed between the base and the vacuum chuck. The vacuum chuck continues to work and sucks out the air in the sealed area to form a vacuum environment in the sealed area, avoiding the formation of bubbles in the coating sheet, and improving the detection effect.

[0021] 4. When the coating is extruded, the amount of dropped coating is sufficient to cover the entire glass plate, and the shape of the coating sheet is consistent with that of the glass plate. Different shaped glass plates can be placed according to the needs of detection, such as square or circular glass plates. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a structural schematic diagram of the present application.

[0023] Figure 2 is a structural schematic diagram of the coating dropper of the present application.

[0024] Figure 3 is a sectional view of the coating dropper of the present application.

[0025] Figure 4 is a sectional view of the dropper head.

[0026] Figure 5 is a structural schematic diagram of the base support of the present application.

[0027] Figure 6 is a structural diagram of the driving member of the present application.

[0028] Figure 7 is a structural diagram of the material taking and flattening device of the present application.

[0029] Figure 8 is a structural diagram of the bottom support, the back-shaped backing plate and the adjusting screw of the present application.

[0030] Figure 9 is an exploded diagram of the bottom support, the back-shaped backing plate and the adjusting screw of the present application.

[0031] The reference signs are explained as follows: 1, glass plate; 2, base; 21, main shaft; 3, bottom support; 31, bottom plate; 32, placing groove; 33, through hole; 34, recovery cover; 4, paint dropper; 41, support rod; 42, dropper tube; 421, piston; 43, dripper head; 431, dripping hole; 432, flow-through hole; 44, liquid inlet pipe; 441, one-way valve; 45, reciprocating screw; 451, connecting rod; 452, driving gear; 46, return spring; 47, adjusting knob; 48, sealing plug; 481, abutting spring; 49, storage groove; 491, storage cover; 5, driving member; 51, transmission gear; 52, incomplete gear; 6, material taking and flattening device; 61, support frame; 62, sliding support frame; 63, vacuum chuck; 64, driving shaft; 65, conveying belt; 66, back-shaped notch; 67, back-shaped backing plate; 68, adjusting screw. DETAILED DESCRIPTION

[0032] The following will be explained in detail with reference to the accompanying drawings. Figures 1 to 9 The present application will be further explained in detail.

[0033] The embodiment of the present application discloses a test piece sampling device for paint detection. Paint is dripped between two glasses, and then the paint is extruded by the glasses. The paint is uniformly distributed between the glasses to form a flat coating layer, so that the problems of paint adhesion and air entrainment are effectively avoided, and the uniformity and quality of the coating layer are ensured. Meanwhile, the shape of the paint piece is consistent with that of the glass, and different shapes of the glass can be placed according to the detection needs. EMBODIMENT

[0034] Refer to Figure 1 and Figure 2 As shown in the drawings, before the paint detection, the paint needs to be first brushed on the glass plate 1. After the paint is dried and formed, the paint piece is taken off from the glass, and then is cut according to the subsequent detection needs to be cut into a shape with a proper size.

[0035] In order to uniformly brush the paint, the embodiment of the present application discloses a test piece sampling device for paint detection, which comprises a base 2. The base 2 is provided with a main shaft 21 which is rotatably arranged on the base 2. One side of the base 2 is provided with a bottom support 3.

[0036] In the process of painting, first, the glass plate 1 is placed on the bottom support 3, and then the paint is quantitatively dropped on the glass plate 1 placed in advance through the paint dropper 4 provided on the main shaft 21, and the paint dropper 4 is located directly above the bottom support 3. Then the driving member 5 provided on the base 2 drives the main shaft 21 to rotate, so that the paint dropper 4 is away from the direct upper side of the bottom support 3. Then another same glass plate 1 is grabbed by the existing technology, and the grabbed glass plate 1 is pressed on the glass plate 1 on the bottom support 3, so that the paint is squeezed between the two glass plates 1. The paint is evenly distributed between the glass plates 1 to form a flat coating layer, effectively avoiding the problems of paint adhesion and air entrainment, and ensuring the uniformity and quality of the coating.

[0037] In the process of squeezing the paint, the amount of the dropped paint is sufficient to cover the entire glass plate 1, and then the excess paint will overflow from the edge of the glass plate 1 and fall into the bottom support 3, which will collect it.

[0038] The glass plate 1 coated with paint is placed for a period of time to wait for the paint to dry completely and form a shape. After the paint is dry, the two glass plates 1 are separated, and the formed paint piece is removed for detection, which improves the uniformity of painting and the quality of the coating.

[0039] The paint piece is consistent with the shape of the glass plate 1, and different shapes of glass plates 1 can be placed according to the needs of detection, such as square glass plates 1 or circular glass plates 1, etc.

[0040] Referring to Figure 2 , Figure 3 and Figure 4 , specifically, the paint dropper 4 includes a support rod 41 provided on the main shaft 21, one end of the support rod 41 is provided with a dropping tube 42 located directly above the bottom support 3, and the lower end of the dropping tube 42 is provided with a dropping head 43.

[0041] The paint dropper 4 further includes a piston 421 slidingly provided in the dropping tube 42, the dropping tube 42 is provided with a liquid inlet pipe 44 located on one side of the piston 421, and the dropping tube 42 is slidingly provided with a reciprocating screw 45. After the glass plate 1 is placed on the bottom support 3, the driving gear 452 rotatingly provided on the dropping tube 42 is driven to rotate by the existing driving technology, and the rotating driving gear 452 forces the reciprocating screw 45 to reciprocate in the dropping tube 42 through the threaded connection with the reciprocating screw 45.

[0042] During each reciprocating movement of the reciprocating screw 45, the reciprocating screw 45 drives the connecting rod 451 arranged thereon, the lower end of the connecting rod 451 is connected with the piston 421, the piston 421 is driven by the connecting rod 451 to move reciprocatingly in the drop tube 42, when the piston 421 moves upward, the drop tube 42 is vacuumized, at this time, the paint enters the drop tube 42 through the liquid inlet pipe 44, when the piston 421 moves downward, since the one-way valve 441 is arranged on the liquid inlet pipe 44, the paint in the drop tube 42 enters the drop head 43, and then falls on the glass plate 1 placed in advance through the drop head 43.

[0043] The bottom of the drop head 43 is provided with a drop hole 431, a plurality of flow-through holes 432 are circumferentially arranged in the drop head 43 and communicate with the drop hole 431, and the sealing plug 48 is slidably arranged in the drop head 43.

[0044] The abutting spring 481 arranged at the bottom of the sealing plug 48 pushes the sealing plug 48 to block the flow-through hole 432, when the piston 421 moves upward, a negative pressure environment is formed between the sealing plug 48 and the piston 421, the paint passing through the liquid inlet pipe 44 enters between the piston 421 and the sealing plug 48, when the piston 421 moves downward, the piston 421 pushes the paint to move towards the sealing plug 48, the paint pushes the sealing plug 48 to move downward and compresses the abutting spring 481, so as to open the flow-through hole 432, the paint enters the drop hole 431 through the flow-through hole 432, and finally falls from the drop hole 431 and drops on the glass plate 1 placed in advance.

[0045] When the piston 421 completely pushes out the paint in the drop tube 42 and moves to the bottom of the drop tube 42, since the paint is completely discharged, the compressed abutting spring 481 pushes the sealing plug 48 to block the flow-through hole 432 again.

[0046] The main shaft 21 is provided with a storage groove 49, one end of the liquid inlet pipe 44 penetrates into the storage groove 49, the upper end of the storage groove 49 is provided with a detachable storage cover 491, the storage groove 49 is filled with paint, and the storage cover 491 is used for sealing, when the piston 421 moves upward, the paint in the storage groove 49 enters the drop tube 42 through the liquid inlet pipe 44 and the one-way valve 441.

[0047] The connecting rod 451 is slidably connected between the reciprocating screw 45 and the piston 421, the reciprocating screw 45 is provided with a return spring 46, and the connecting rod 451 is threadedly connected with the adjusting knob 47 arranged above the reciprocating screw 45.

[0048] When the reciprocating screw 45 moves upward, the reset spring 46 will first release the piston 421 to keep still, until the upper end of the reciprocating screw 45 abuts against the adjusting knob 47, the reciprocating screw 45 will drive the connecting rod 451 to move the piston 421 together, so that the piston 421 will vacuum between the piston 421 and the sealing plug 48, and the paint will enter the dropper 42 from the liquid inlet pipe 44.

[0049] Conversely, when the reciprocating screw 45 moves downward, the reset spring 46 will push the connecting rod 451 to make the adjusting knob 47 abut against the reciprocating screw 45, the reciprocating screw 45 drives the connecting rod 451 to move the piston 421 downward, until the piston 421 moves to the lower end of the dropper 42, the reciprocating screw 45 continues to move downward and compresses the reset spring 46, so that the upper end of the reset spring 46 is separated from the adjusting knob 47.

[0050] The stroke of the piston 421 determines the amount of paint extruded, that is, the longer the stroke of the piston 421 moving upward, the more paint is extruded, and vice versa, the shorter the stroke of the piston 421 moving upward, the less paint is extruded, rotating the adjusting knob 47, the adjusting knob 47 moves on the connecting rod 451 through the thread cooperation with the connecting rod 451, in the case that the stroke of the reciprocating screw 45 is unchanged, the position of the reciprocating screw 45 contacting the adjusting knob 47 is changed, so as to change the stroke of the connecting rod 451 driving the piston 421.

[0051] That is, when the position of the adjusting knob 47 on the connecting rod 451 is higher, it is relatively farther away from the reciprocating screw 45, at this time, the reciprocating screw 45 moves upward to contact the adjusting knob 47 later, so as to drive the piston 421 to move with a shorter stroke, and vice versa, when the position of the adjusting knob 47 on the connecting rod 451 is lower, it is relatively closer to the reciprocating screw 45, at this time, the reciprocating screw 45 moves upward to contact the adjusting knob 47 earlier, so as to drive the piston 421 to move with a longer stroke.

[0052] Referring to Figure 5 Specifically, the bottom support 3 includes a bottom plate 31 arranged on one side of the base 2, and a plurality of through holes 33 are arranged in an array in a placing groove 32 formed in the bottom plate 31, when painting, the glass plate 1 is first placed in the placing groove 32 formed in the bottom support 3.

[0053] When the paint is extruded, the amount of paint dropped is sufficient to cover the entire glass plate 1, and then the excess paint will overflow from the edge of the glass plate 1 and fall into the bottom support 3, and then flow into the recovery cover 34 arranged at the lower end of the bottom plate 31 through the through holes 33, and the recovery cover 34 is detachably arranged at the lower end of the bottom plate 31.

[0054] Referring to Figure 6As shown, specifically, the driving member 5 includes a transmission gear 51 rotatably arranged on the main shaft 21 at the lower end of the base 2, and the base 2 is provided with an incomplete gear 52 engaged with the transmission gear 51.

[0055] The incomplete gear 52 is driven by the existing driving technology, and the rotating incomplete gear 52 drives the main shaft 21 to rotate through the engagement with the transmission gear 51. Whenever the incomplete gear 52 rotates one circle, the transmission gear 51 drives the main shaft 21 to rotate 180 degrees, so that the drip pipe 42 and the drip head 43 are away from the upper end of the bottom plate 31. When the incomplete gear 52 rotates again, the transmission gear 51 drives the transmission gear 51 to rotate 180 degrees again, so that the drip pipe 42 and the drip head 43 return to the upper end of the bottom plate 31. Embodiment

[0056] Reference Figure 7 、 Figure 8 and Figure 9 On the basis of the first embodiment, the main shaft 21 is provided with a material taking and flattening device 6 on one side.

[0057] The material taking and flattening device 6 includes a supporting frame 61 arranged on one side of the main shaft 21, a sliding supporting frame 62 slidably arranged on the supporting frame 61, a vacuum chuck 63 arranged on the sliding supporting frame 62, and a driving shaft 64 threadedly connected with the sliding supporting frame 62 and rotatably arranged on the supporting frame 61.

[0058] When painting, first, the driving shaft 64 is driven to rotate, and the rotating driving shaft 64 drives the sliding supporting frame 62 and the vacuum chuck 63 to move downward, and the first glass plate 1 is sucked from the conveying belt 65 arranged on one side of the base 2, and the conveying belt 65 is located directly below the vacuum chuck 63. Then, the incomplete gear 52 rotates, and the main shaft 21 drives the supporting frame 61, the sliding supporting frame 62 and the vacuum chuck 63 to rotate to the upper end of the bottom plate 31, and then the driving shaft 64 drives the vacuum chuck 63 to place the first glass plate 1 in the placing groove 32.

[0059] Then, the incomplete gear 52 rotates again, and the vacuum chuck 63 returns to the upper side of the conveying belt 65, and the driving shaft 64 drives the vacuum chuck 63 to suck the incomplete gear 52 from the conveying belt 65, and the piston 421 moves reciprocally to drop the paint on the first glass plate 1. Subsequently, the incomplete gear 52 drives the transmission gear 51 to rotate 180 degrees, and the vacuum chuck 63 drives the second glass plate 1 to move to the upper side of the first glass plate 1.

[0060] Then, the vacuum chuck 63 presses the second glass plate 1 on the first glass plate 1, so that the paint is evenly distributed between the two glass plates 1, forming a flat coating layer, ensuring the uniformity and quality of the coating layer, and then the excess paint will overflow from the edges of the glass plate 1 and fall into the support 3, and then flow into the recovery cover 34 arranged at the lower end of the bottom plate 31 through the through hole 33, and the recovery cover 34 is detachably arranged at the lower end of the bottom plate 31.

[0061] At the same time, when the vacuum chuck 63 presses the second glass plate 1 on the first glass plate 1, a sealed area is formed between the base 2 and the vacuum chuck 63, and the vacuum chuck 63 continues to work to suck out the air in the sealed area, so that a vacuum environment is formed in the sealed area, avoiding bubbles in the formed paint piece, and improving the detection effect.

[0062] The two glass plates 1 coated with paint are placed for a period of time to wait for the paint to completely dry and form, and after the paint is dry, the two glass plates 1 are separated, and the formed paint piece is taken out for detection, improving the uniformity of brushing and the quality of the coating layer.

[0063] Among them, the bottom plate 31 is provided with a back-shaped notch 66 on the upper ring, and a back-shaped pad 67 is slidably arranged in the back-shaped notch 66, and an adjusting screw 68 is rotatably arranged on the back-shaped pad 67 and is screwed with the bottom plate 31.

[0064] By rotating the adjusting screw 68, the adjusting screw 68 will move upward through the screw thread cooperation with the bottom plate 31, so that the back-shaped pad 67 moves upward, and the second glass plate 1 is pressed on the first glass plate 1 by the vacuum chuck 63, so that the back-shaped pad 67 lifts the vacuum chuck 63 by a certain gap, to control the gap between the two glass plates 1, thereby controlling the thickness of the paint piece.

[0065] The implementation principle of the present application is: (1) When brushing, first drive the driving shaft 64 to rotate, the rotating driving shaft 64 drives the sliding support frame 62 to move downward, and the vacuum chuck 63 sucks the first glass plate 1 from the conveying belt 65 arranged on one side of the base 2, and then the incomplete gear 52 rotates, and the main shaft 21 drives the support frame 61, the sliding support frame 62 and the vacuum chuck 63 to rotate to the upper end of the bottom plate 31, and then the driving shaft 64 drives the vacuum chuck 63 to place the sucked first glass plate 1 in the placing groove 32.

[0066] (2) Then, the incomplete gear 52 rotates again, and the transmission gear 51 drives the transmission gear 51 to rotate 180 degrees again, so that the vacuum chuck 63 returns to the upper side of the conveying belt 65, and the driving shaft 64 drives the vacuum chuck 63 to suck the second glass plate 1 from the conveying belt 65 again, and the dropper 42 and the dripping head 43 return to the upper end of the bottom plate 31.

[0067] (3): The drive gear 452 will force the reciprocating screw 45 to move once in the dropper 42 by screwing with the reciprocating screw 45, when the reciprocating screw 45 moves upward, the reset spring 46 will first release the piston 421 to keep it stationary until the upper end of the reciprocating screw 45 abuts against the adjusting knob 47, the reciprocating screw 45 will drive the connecting rod 451 through the adjusting knob 47 to move the piston 421 together, so that the piston 421 will vacuum between the sealing plug 48, and the paint will enter the dropper 42 from the liquid inlet pipe 44.

[0068] (4): When the reciprocating screw 45 moves downward, the reset spring 46 will push the connecting rod 451 to make the adjusting knob 47 abut against the reciprocating screw 45, the reciprocating screw 45 will drive the connecting rod 451 through the adjusting knob 47 to make the piston 421 push the paint to move to the sealing plug 48, the paint will push the sealing plug 48 to move downward and compress the abutting spring 481 to open the flow-through hole 432, the paint will pass through the flow-through hole 432 into the droplet hole 431, and finally fall from the droplet hole 431 and drop on the first glass plate 1 placed in advance.

[0069] (5): Subsequently, the incomplete gear 52 drives the transmission gear 51 to rotate the main shaft 21 by 180 degrees again, the vacuum chuck 63 drives the second glass plate 1 to move above the first glass plate 1, then the vacuum chuck 63 presses the second glass plate 1 on the first glass plate 1, so that the paint is evenly distributed between the two glass plates 1 to form a flat coating.

[0070] (6): After that, the excess paint will overflow from the edge of the glass plate 1 and fall into the bottom support 3, and then flow into the recovery cover 34 arranged at the lower end of the bottom plate 31 through the through hole 33, and the recovery cover 34 is detachably arranged at the lower end of the bottom plate 31.

[0071] (7): When the vacuum chuck 63 presses the second glass plate 1 on the first glass plate 1, a sealed area will be formed between the base 2 and the vacuum chuck 63, and the vacuum chuck 63 will continue to work to suck out the air in the sealed area, so that a vacuum environment is formed in the sealed area to avoid bubbles in the formed paint piece.

[0072] (8): The two glass plates 1 coated with paint are placed for a period of time to wait for the paint to dry completely and form, and after the paint is dry, the two glass plates 1 are separated, and the formed paint piece is taken down for detection, which improves the uniformity of brushing and the quality of the coating.

[0073] The embodiments of the specific implementation are the preferred embodiments of the present application, not limited to the protection scope of the present application, so that: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A sample collection device for coating testing, comprising a base (2), wherein a main shaft (21) is rotatably mounted on the base (2), characterized in that: A base support (3) is provided on one side of the base (2), and a paint dripper (4) is provided on the main shaft (21). The paint dripper (4) includes a support rod (41) mounted on a main shaft (21), and a drip tube (42) located directly above the base (3) is mounted on one end of the support rod (41). A drip head (43) is mounted on the lower end of the drip tube (42). The paint dripper (4) also includes a piston (421) slidably disposed inside the drip tube (42). The drip tube (42) is provided with an inlet pipe (44) located on one side of the piston (421). A reciprocating screw (45) is slidably disposed on the drip tube (42). A connecting rod (451) connected to the piston (421) is disposed on the reciprocating screw (45). A drive gear (452) threadedly connected to the reciprocating screw (45) is rotatably disposed on the drip tube (42).

2. The sample collection device for coating testing according to claim 1, characterized in that: The connecting rod (451) is slidably connected to the reciprocating screw (45), and a return spring (46) is provided between the reciprocating screw (45) and the piston (421). An adjustment knob (47) located above the reciprocating screw (45) is threaded onto the connecting rod (451).

3. The sample collection device for coating testing according to claim 1, characterized in that: The dropper (43) has a drip hole (431) at the bottom and multiple flow holes (432) communicating with the drip hole (431) are opened in the inner circumference of the dropper (43). A sealing plug (48) is slidably disposed inside the dropper (43).

4. The sample collection device for coating testing according to claim 3, characterized in that: The bottom of the sealing plug (48) is provided with an abutment spring (481).

5. A sample sampling device for coating testing according to claim 1, characterized in that: The main shaft (21) is provided with a storage tank (49), one end of the liquid inlet pipe (44) extends into the storage tank (49), and the upper end of the storage tank (49) is provided with a removable storage cover (491).

6. A sample sampling device for coating testing according to claim 1, characterized in that: A one-way valve (441) is provided on the inlet pipe (44).

7. A sample sampling device for coating testing according to claim 1, characterized in that: The base (3) includes a base plate (31) provided on one side of the base (2), and a placement groove (32) is provided on the base plate (31), and a plurality of through holes (33) arranged in an array are provided in the placement groove (32).

8. A sample sampling device for coating testing according to claim 7, characterized in that: The bottom end of the base plate (31) is provided with a removable recycling cover (34).

9. A sample sampling device for coating testing according to claim 1, characterized in that: A drive component (5) is provided on the base (2); The drive unit (5) includes a transmission gear (51) rotatably mounted on the main shaft (21) and located at the lower end of the base (2), and the base (2) is provided with an incomplete gear (52) that meshes with the transmission gear (51).

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