Device and method for testing water impact resistance of sealing rubber strip

Abstract

A device for testing the water impact resistance of a sealing rubber strip comprises a water bath thermostatic bath, a test plate fixing device is installed at the bottom of the water bath thermostatic bath and comprises a fixed bottom plate, two parallel longitudinal fixed plates are arranged on the fixed bottom plate, the longitudinal fixed plates are perpendicular to the fixed bottom plate, and the longitudinal fixed plates are perpendicular to the fixed bottom plate. A space for placing a test plate is formed between the two longitudinal fixing plates, a test plate placing groove is formed in the upper end of the longitudinal fixing plate on one side, a test plate is placed between the longitudinal fixing plates, the upper end of the test plate is installed in the test plate placing groove, and the lower end of the test plate abuts against the bottom of the longitudinal fixing plate on one side; an included angle alpha is formed between the test plate and the fixed bottom plate, a sealing rubber strip is arranged in the middle of the upper end face of the test plate, scale marks are drawn on the test plate below the sealing rubber strip, and a warm water spraying device is arranged above the test plate and sprays warm water to the test plate.

Description

Technical Field

[0001] The invention relates to the field of vehicle body sealing devices, and in particular to a device for testing the water impact resistance of a sealing rubber strip. Background Art

[0002] The body of a car is an important part of its overall structure. If the sealing of the body is poor, dust, rain and other factors will erode the body during driving, greatly shortening the service life of the body.

[0003] The adhesives on the car body mainly include hemming glue, spot welding glue, expansion glue, weld sealant, etc. Car spot welding sealant is mainly used for sealing wheel covers, front wall, side wall and floor, etc., especially for vertical gaps that are covered by parts after welding or are not suitable for applying weld sealant. If the primer is applied by spray painting, it cannot enter the weld, and the paint quality at the overlap of the steel plate cannot be guaranteed, and it cannot prevent the weld from rusting. Spot welding sealant can make up for the shortcomings of this type of painting process. Car expansion sealant is mainly used between inner and outer panels such as hood, trunk lid, top cover and door to reduce vibration and noise and increase the comfort of the whole vehicle. Hemming glue is mainly used in the hemming structure of the door cover, which can replace the welding point and avoid appearance defects. For the hemming of the door, hood and luggage cover, it can avoid pits caused by welding and improve the appearance quality of the car body.

[0004] These three commonly used sealants all have a paste appearance and are applied into semicircular paste strips with a cross-sectional diameter of about 8mm to 10mm. When these sealant strips are not cured, they are soaked in pre-treatment liquid (degreasing agent, phosphating liquid, cathode electrophoresis), processed (degreasing → rust removal → phosphating → electrophoresis), and then sprayed with various colors of automotive topcoat, and finally cured on the vehicle. When not cured, it was found on the surface and during the coating process that after spraying the topcoat, the strips sometimes fall off.

[0005] The water impact resistance of sealing strips is an important indicator for testing the performance of sealants. The existing testing devices for sealing strips are bulky and outdated, making them difficult to implement. At present, there are no corresponding national or industry standards, which makes it impossible to implement the water impact resistance test for sealing strips. Therefore, it is necessary to provide an effective method and device for simulating the water impact resistance of sealing strips. Summary of the invention

[0006] The purpose of the present invention is to provide a device and method for testing the water impact resistance of a sealing strip in view of the corresponding deficiencies of the prior art. The testing device has a simple structure and strong practicality. The testing method improves the accuracy and precision of the test results.

[0007] The objective of the present invention is achieved by adopting the following scheme: a device for testing the water impact resistance of a sealing strip, comprising a water bath thermostatic bath, a test plate fixing device being installed at the bottom of the water bath thermostatic bath, the test plate fixing device comprising a fixed bottom plate, two longitudinal fixing plates parallel to each other being arranged on the fixed bottom plate, the longitudinal fixing plates and the fixed bottom plate being perpendicular to each other, a space for placing the test plate being provided between the two longitudinal fixing plates, a test plate placing groove being arranged at the upper end of one longitudinal fixing plate, a test plate being placed between the longitudinal fixing plates, the upper end of the test plate being installed in the test plate placing groove, the lower end of the test plate being close to the bottom of one longitudinal fixing plate, an angle α being formed between the test plate and the fixed bottom plate, a sealing strip being arranged at the middle part of the upper end surface of the test plate, a scale line being drawn on the test plate below the sealing strip, a warm water spraying device being arranged above the test plate, the warm water spraying device spraying warm water onto the test plate.

[0008] The test plate is an oil-immersed steel plate with surface treatment.

[0009] A plurality of through holes which axially penetrate the fixed bottom plate are arranged on the fixed bottom plate of the test plate fixing device.

[0010] The angle between the test plate and the fixed bottom plate is 45°, and the angle between the bottom of the test plate placement groove and the longitudinal fixed plate is 135°.

[0011] The sealing strip is a semicircular sealing strip.

[0012] The nozzle model of the warm water spray device is GG-1 / 2, the inner diameter of the water pipe of the warm water spray device is ≧10mm, the water pipe flow rate is L / min, and the warm water temperature is 55°C.

[0013] The test panel fixture is made of plastic.

[0014] The testing method of the sealing strip water impact resistance testing device comprises the following steps: 1) Apply a semicircular sealing strip on the test panel, place it horizontally at (23±2)℃ for 1h, and make a scale line on the lower edge of the sealing strip; 2) Place the test panel fixture into a water bath thermostatic chamber, and place the horizontally placed test panel into the test panel fixture; 3) Pour the test water into the water bath thermostat, adjust the water level to 80mm, and adjust the temperature control device to (55±5)℃; 4) Turn on the warm water spray device to rinse the sealing strips on the test plate with warm water; 5) Visually check whether the sealing strip has deformation or displacement beyond the scale line, and record the maximum deformation or displacement.

[0015] Step 4) The direction of the warm water spraying device is perpendicular to the test panel, the spray port is 150mm away from the test panel, the spray point is 175mm away from the sealing strip, and the moving speed of the nozzle is 100mm / s.

[0016] In step 4), move the water nozzle horizontally and continuously reciprocate to flush the sealing strip for 3 minutes.

[0017] The advantages of the present invention are that the test device has a simple structure, a small and flexible volume, strong practicability, and is easy to install and debug. The test method controls the test reproducibility in the production process, improves the precision and accuracy of the test results, improves the quality reliability of the product, reduces the workload, and reduces the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the testing device of the present invention; Figure 2 It is a schematic diagram of the test panel and the sealing strip structure; Figure 3 Schematic diagram of the test panel fixing device structure DETAILED DESCRIPTION

[0019] like Figures 1 to 3As shown, a device for testing the water impact resistance of a sealing rubber strip comprises a water bath thermostatic bath 1, a test plate fixture 2 is installed at the bottom of the water bath thermostatic bath 1, and the test plate fixture 2 is made of plastic. The test plate fixture 2 comprises a fixed bottom plate 2-1, and a plurality of through holes 2-3 axially penetrating the fixed bottom plate 2-1 are arranged on the fixed bottom plate 2-1 of the test plate fixture 2. Two longitudinal fixing plates 2-2 parallel to each other are arranged on the fixed bottom plate 2-1, and the longitudinal fixing plates 2-2 and the fixed bottom plate 2-1 are perpendicular to each other. There is a space for placing a test plate 6 between the two longitudinal fixing plates 2-2, and a test plate placement groove 5 is arranged at the upper end of one side of the longitudinal fixing plates 2-2. A test plate 6 is placed between the longitudinal fixing plates 2-2, and the test plate 6 is an oil-immersed steel plate with surface treatment. The upper end of the test plate 6 is installed in the test plate placement groove 5, and the lower end of the test plate 6 is close to the bottom of the longitudinal fixed plate 2-2 on one side. The test plate 6 and the fixed bottom plate 2-1 form an angle of 45°, and the angle between the bottom of the test plate placement groove 5 and the longitudinal fixed plate 2-2 is 135°. A sealing strip 7 is set in the middle of the upper end surface of the test plate 6, and the sealing strip 7 is a semicircular sealing strip. A scale line 8 is drawn on the test plate 6 below the sealing strip 7. A warm water spray device 3 is set above the test plate 6, and the warm water spray device 3 sprays warm water 4 to the test plate 7. The nozzle model on the warm water spray device 3 is GG-1 / 2, the inner diameter of the water pipe of the warm water spray device 3 is ≧10mm, the water pipe flow rate is 11.5±0.5L / min, and the warm water temperature is 55℃.

[0020] The testing method of the sealing strip water impact resistance testing device comprises the following steps: 1) Apply a semicircular sealing strip on the test plate. The strip is 200 mm long and 20 mm in diameter. Place it horizontally at (23 ± 2) °C for 1 hour and make a scale line on the lower edge of the strip. 2) Place the test panel fixture into a water bath thermostatic chamber, and place the horizontally placed test panel into the test panel fixture; 3) Pour the test water into the water bath thermostat, adjust the water level to 80mm, and adjust the temperature control device to (55±5)℃; 4) Turn on the warm water spray device to rinse the sealing strips on the test plate with warm water; the warm water spray device sprays warm water in a direction perpendicular to the test plate, the spray port is 150mm away from the test plate, the spray point is 175mm away from the sealing strip, and the moving speed of the nozzle is 100mm / s. Move the water spray port horizontally, and continuously reciprocate to rinse the sealing strip for 3 minutes.

[0021] 5) Visually check whether the sealing strip has deformation or displacement beyond the scale line, and record the maximum deformation or displacement.

[0022] After the test is completed, different types of sealing strips can be replaced for water resistance testing. If the test panel is damaged during the test, the test panel can also be replaced.

[0023] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification made to the present invention by those skilled in the art without departing from the spirit of the present invention shall fall within the protection scope of the present invention.

Claims

1. A device for testing the water impact resistance of a sealing strip, comprising a water bath thermostatic bath (1), characterized in that: The bottom of the water bath thermostatic bath (1) is provided with a test plate fixing device (2), the test plate fixing device (2) comprising a fixing bottom plate (2-1), two mutually parallel longitudinal fixing plates (2-2) being arranged on the fixing bottom plate (2-1), the longitudinal fixing plates (2-2) and the fixing bottom plate (2-1) being perpendicular to each other, a space for placing a test plate (6) being provided between the two longitudinal fixing plates (2-2), a test plate placement groove (5) being provided at the upper end of one longitudinal fixing plate (2-2), a test plate being placed between the longitudinal fixing plates (2-2) (6), the upper end of the test plate (6) is installed in the test plate placement groove (5), the lower end of the test plate (6) is close to the bottom of the longitudinal fixed plate (2-2) on one side, the test plate (6) and the fixed bottom plate (2-1) form an angle α, a sealing strip (7) is provided in the middle of the upper end surface of the test plate (6), and a scale line (8) is drawn on the test plate (6) below the sealing strip (7), and a warm water spray device (3) is provided above the test plate (6), and the warm water spray device (3) sprays warm water (4) onto the test plate (7).

2. The device for testing the water impact resistance of sealing strips according to claim 1, characterized in that: The test plate (6) is an oil-immersed steel plate that has undergone surface treatment.

3. The device for testing the water impact resistance of sealing strips according to claim 1, characterized in that: A plurality of through holes (2-3) axially penetrating the fixed bottom plate (2-1) are provided on the fixed bottom plate (2-1) of the test plate fixing device (2).

4. The device for testing the water impact resistance of sealing strips according to claim 1, characterized in that: The angle between the test plate (6) and the fixed bottom plate (2-1) is 45°, and the angle between the bottom of the test plate placement groove (5) and the longitudinal fixed plate (2-2) is 135°.

5. The device for testing the water impact resistance of sealing strips according to claim 1, characterized in that: The sealing strip (7) is a semicircular sealing strip.

6. The device for testing the water impact resistance of sealing strips according to claim 1, characterized in that: The nozzle model of the warm water spray device (3) is GG-1 / 2, the inner diameter of the water pipe of the warm water spray device (3) is ≧10 mm, the water pipe flow rate is (11.5±0.5) L / min, and the warm water temperature is 55°C.

7. The device for testing the water impact resistance of sealing strips according to claim 1, characterized in that: The test panel fixing device (2) is made of plastic.

8. A testing method based on the sealing strip water impact resistance testing device according to any one of claims 1 to 7, characterized in that: The following steps are involved: 1) Apply a semicircular sealing strip on the test panel, place it horizontally at (23±2)℃ for 1h, and make a scale line on the lower edge of the sealing strip; 2) Place the test panel fixture into a water bath thermostatic chamber, and place the horizontally placed test panel into the test panel fixture; 3) Pour the test water into the water bath thermostat, adjust the water level to 80mm, and adjust the temperature control device to (55±5)℃; 4) Turn on the warm water spray device to rinse the sealing strips on the test plate with warm water; 5) Visually check whether the sealing strip has deformation or displacement beyond the scale line, and record the maximum deformation or displacement.

9. The testing method according to claim 8, characterized in that: Step 4) The direction of the warm water spraying device is perpendicular to the test panel, the spray port is 150mm away from the test panel, the spray point is 175mm away from the sealing strip, and the moving speed of the nozzle is 100mm / s.

10. The testing method according to claim 8, characterized in that: In step 4), move the water nozzle horizontally and continuously reciprocate to flush the sealing strip for 3 minutes.

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