Automatic sample bending device for asphalt brittle point test

Abstract

The utility model discloses an automatic sample bending device for asphalt brittle point test, which comprises a bottom plate and a support frame, a driving motor is mounted on the support frame, an output shaft of the driving motor is connected with a screw rod, a screw sleeve is mounted on the screw rod, a lifting plate is fixed on the screw sleeve, and the lifting plate is fixed on the support frame. Corresponding sample metal sheet bayonet grooves are formed in the lifting plate and the bottom plate, and the sample metal sheet bayonet grooves are in a strip-shaped groove shape. According to the utility model, the processes of bending, flattening and waiting of the asphalt sample metal sheet according to requirements can be completed and realized without difference, and the processes are repeated until brittle spots appear. And the procedures of bending time, flattening and waiting time of the asphalt sample metal sheet can be accurately executed in one minute without difference. Three samples can be loaded each time, and the brittle points of the three samples can be detected in parallel at the same time in one test, so that the asphalt brittle point detection efficiency is improved.

Description

Technical Field

[0001] The utility model relates to a testing device, in particular to an automatic bending device for a sample of an asphalt brittle point test. Background Art

[0002] The brittle point of asphalt refers to the temperature at which brittle fracture occurs when the asphalt is subjected to bending stress under constant cooling conditions of one degree per minute. The determination method is to evenly apply a 0.4g asphalt sample to a 41mm x 20mm metal sheet with a coating thickness of 0.5mm. The specimen is then cooled at a constant rate under standard test conditions and the sheet is slowly and repeatedly bent. The temperature at which one or more cracks appear in the asphalt coating due to cooling and bending is observed. This temperature is the asphalt's brittle point.

[0003] Testing for asphalt brittle spots requires a constant cooling test environment. Furthermore, a metal sheet coated with an asphalt sample, as specified in the standard, is bent once per minute, observing the temperature at which cracks appear. Within this minute, the bending process takes approximately 10 to 12 seconds from the start to the point of full bending. The sheet is then flattened within 50 to 48 seconds, and the next bending test begins.

[0004] According to the asphalt brittle point detection specifications, the metal sheet coated with asphalt sample is bent once per minute as required, which is a very critical step in asphalt brittle point detection.

[0005] At present, the general asphalt brittle point detection device is:

[0006] 1. The bending action of the metal sheet coated with the asphalt sample is made into a hand-cranked device, which is manually operated to bend and flatten the metal sheet.

[0007] 2. The time for bending the metal sheet and the time for flattening and waiting after bending are achieved by manual control.

[0008] 3. Only one sample is tested in each test.

[0009] According to the asphalt brittle point detection specifications, the same sample must be tested in parallel at least three times. The temperature must be raised to the same state as the first test in each test. The average of the three measured values ​​with an error within 3°C is taken as the test result, and the integer is taken as the brittle point of the sample.

[0010] Defects and shortcomings:

[0011] 1. Since the metal sheet bending of the asphalt sample is completed by manual control, the control of the (10-12) second bending time varies not only from person to person, but even for the same person, there will be differences in the bending time each time, so there is a defect of inaccurate bending time control.

[0012] 2. Since the requirement of bending the metal sheet of the asphalt sample once per minute is completed by manual control, the distribution of bending and flattening time and the control of one minute will vary from person to person and from time to time, and there will be certain differences. Therefore, there is a defect of poor consistency in the one-minute control time and the bending, flattening and waiting actions within one minute.

[0013] 3. Since the constant cooling condition of the sample at one degree per minute is unchanged, the differences in the bending time of the sample metal sheets, the one-minute timing and the time distribution of each action are insufficient, which may affect the test results.

[0014] 4. Since the general brittle point test device tests one sample at a time, there is a disadvantage of low detection efficiency.

[0015] Therefore, developing an automatic bending device for asphalt brittle point test specimens has become an urgent problem to be solved by those skilled in the art. Utility Model Content

[0016] In order to address the above-mentioned shortcomings, the present utility model provides an automatic bending device for asphalt brittle point testing. It can uniformly complete and implement the process of bending, flattening, and waiting for the asphalt sample metal sheet as required every minute, repeating the process over and over again until the brittle point appears. It can uniformly and accurately execute the bending time (10 to 12 seconds) and flattening and waiting time (50 to 48 seconds) of the asphalt sample metal sheet every minute. It can also load three samples at a time, and the brittle points of three samples can be tested in parallel in one test, thereby improving the efficiency of asphalt brittle point detection.

[0017] The above-mentioned purpose of the present utility model is achieved through the following technical scheme: an automatic bending device for specimens of asphalt brittle point test, comprising a base plate and a support frame, a driving motor is installed on the support frame, the output shaft of the driving motor is connected to a screw, a screw sleeve is installed on the screw, a lifting plate is fixed on the screw sleeve, and corresponding specimen metal sheet bayonet grooves are provided on the lifting plate and the base plate.

[0018] Furthermore, the sample metal sheet bayonet slot is in the shape of a strip slot, which can clamp a single or multiple sample metal sheets at a time.

[0019] Furthermore, the support frame includes a column and a top plate, the lower end of the column is connected to the bottom plate, the upper end of the column is connected to the top plate, the drive motor is fixed on the top plate, the lifting plate is provided with a guide hole, and the column is passed through the guide hole to guide and stabilize the lifting plate.

[0020] Further, the four posts are evenly distributed between the top plate and the bottom plate.

[0021] Compared with the prior art, the utility model has the advantages of:

[0022] 1. The test action is normative, the time of each subsection action is accurate, and the consistency is good.

[0023] The utility model adopts the electrical control system composed of single-chip microcomputer to control the driving motor, and the sample metal sheet can accurately complete the bending, flattening and waiting procedures every minute, has the advantages of normative test action, accurate time of each subsection action and good consistency.

[0024] 2. The utility model has the advantages of simple operation and convenient use.

[0025] The utility model automatically completes the bending work of the asphalt sample, and does not need manual control of the distribution and action implementation of the sample bending, flattening and waiting time within one minute, has the advantages of simple operation and convenient use.

[0026] 3. The utility model has the advantage of high test efficiency.

[0027] The utility model can simultaneously detect three samples at a time, greatly improves the detection speed, shortens the detection time, saves the detection working hours, and has the advantage of high test efficiency.

[0028] 4. The utility model has the advantage of improving the technical level of the instrument.

[0029] After the utility model is applied to the asphalt brittle point detection instrument, the bending, flattening and waiting of the sample metal sheet are automatically timed and automatically completed, the detection result is accurate and has good consistency, the detection time is shortened, the detection working hours are saved, and the utility model has the advantage of improving the technical level of the instrument. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a (partial section) structural schematic view of the front side of the utility model.

[0031] Figure 2 is a (partial section) structural schematic view of the side of the utility model.

[0032] Figure 3 is a schematic view of the installation form of the sample metal sheet of the utility model.

[0033] Figure 4 is a schematic view of the working state and working mode of the utility model.

[0034] Figure 5The application example schematic diagram of the utility model. DETAILED DESCRIPTION

[0035] The utility model is further described in detail below with reference to the drawings.

[0036] As Figure 1 , Figure 2 shown, a kind of asphalt brittle point test sample automatic bending device, including bottom plate 1 and support frame, the support frame includes stand 7 and top plate 6, the lower end of the stand 7 is connected bottom plate 1, the upper end of stand 7 is connected top plate 6, the driving motor 3 is fixed on top plate 6, the stand 7 has four, evenly distributed between top plate 6 and bottom plate 1;Driving motor 3 is installed on the support frame, the driving motor 3 is used as the power motor for driving lifting plate 2 up and down movement.This motor is controlled under the electrical control system of single-chip microcomputer, and rotation speed is controllable, rotation time is set, and rotation direction is reversible.The output shaft of driving motor 3 is connected with screw rod 4, screw rod 4 is installed with screw sleeve 5, the screw sleeve 5 is fixed with lifting plate 2, the lifting plate 2 is equipped with guide hole (not shown in the figure), the stand 7 is arranged in guide hole, and the function of guiding and stabilizing lifting plate 2 is played;Lifting plate 2 and bottom plate 1 are equipped with corresponding sample metal sheet bayonet slot 8, the sample metal sheet bayonet slot 8 is in the shape of strip-shaped groove, and single or multiple sample metal sheets 9 can be clamped at a time.

[0037] The sample metal sheet 9 mounting form schematic diagram of the utility model is shown in Figure 3 , the utility model can install three sample metal sheets 9 at a time, and the sample on three sample metal sheets 9 is tested simultaneously.Of course, the utility model can install one or two sample metal sheets 9 at a time, and the sample on sample metal sheet is tested.Sample metal sheet 9 is installed in the sample metal sheet mounting bayonet slot 8 (as shown in Figure 2 、 Figure 3 ).

[0038] The working state and mode schematic diagram of the utility model is shown in Figure 4 . Figure 4 In the middle:

[0039] 1, sample metal sheet state A1, sample-coated metal sheet is installed in the utility model, and the state when test has not been started yet is called "initial state".

[0040] 2, sample metal sheet state A2, sample-coated metal sheet is installed in the utility model, and the state when reaching maximum bending after starting test is called "maximum bending state".

[0041] 3, bending test working mode is as follows:

[0042] (1) The metal sheet coated with the sample is installed in the sample mounting bay of the movable plate and the sample mounting bay of the lower mounting plate, and one minute is taken as a test bending period.

[0043] (2) In the initial state, the metal sheet coated with the sample is slightly bent, and the net height between the movable plate and the lower mounting plate is 40 mm.

[0044] (3) After starting the test, the movable plate is driven downward by the driving motor, and the metal sheet coated with the sample reaches the maximum bending state after about 10-12 seconds, and the net height between the movable plate and the lower mounting plate is 36.5 mm.

[0045] (4) In the process from the initial state to the maximum bending state, whether cracking occurs in the three samples is observed. If it occurs, the temperature at which the sample cracks is recorded, which is the brittle point of the sample. If it does not occur, or all three samples do not occur, the following operation is continued.

[0046] (5) Within one minute (50-48 seconds) after the test, the movable plate is driven upward by the driving motor, and the metal sheet coated with the sample is first flattened to recover to the initial state, and then waits.

[0047] (6) After one minute of the test bending period, the next cycle of bending test is started, and the cracking of the sample and the temperature at which the cracking occurs are observed during the test, and the process is repeated until the brittle points of the three samples are all obtained, and the test is ended.

[0048] The application example of the utility model is shown in Figure 5 as shown. Figure 5 In the middle:

[0049] Test bath B1, which is an air test bath with a 1℃ / min cooling rate for brittle point test. Before the test, the test bath temperature is raised to the specified temperature, and after the test starts, the test bath automatically controls the temperature of the test bath at a rate of 1℃ / min.

[0050] Observation window B2, a transparent glass observation window, is located on the upper part of the front of the case B6, just in front of the three sample metal sheets provided by the utility model, and is used to observe whether cracks appear when the asphalt sample is bent.

[0051] The open cover B3, the utility model as a movable whole is installed below the cover. The cover is provided with a hinge leaf at the back, which can be opened. Before the test, open the cover, place the utility model with the test sample metal pieces installed in the cover, connect the wire connection joint between the utility model and the electrical control device of the instrument, and cover the cover. Then the test can be started. After the test, open the cover, disconnect the wire connection joint between the utility model and the electrical control device of the instrument, take out the utility model, and remove the test sample metal pieces that have finished the test.

[0052] The illuminating lamp B4 is installed in the test bath B1 and can illuminate the three test sample metal pieces in the utility model, which is convenient for observing whether the cracks appear when the asphalt sample is bent.

[0053] The control panel B5 is the control test starting program of the utility model, which opens the work procedure of bending, flattening and waiting for the test sample at a frequency of one minute once. When the operator observes the cracks and obtains the brittle point of the test sample, the test program is closed and the utility model stops working.

[0054] The case B6 is the overall case of the asphalt brittle point tester. In the case, the upper half is the test bath B1 and the lower half is the electrical control part composed of a single-chip microcomputer.

[0055] The above is only an embodiment of the utility model, which does not limit the patent range of the utility model. Any equivalent structure or equivalent process transformation or direct or indirect application in other related technical fields based on the content of the utility model specification and drawings is also included in the patent protection range of the utility model.

Claims

1. An automatic bending device for asphalt brittle point test specimens, comprising a base plate and a support frame, characterized in that: A driving motor is installed on the support frame, the output shaft of the driving motor is connected to the screw, a screw sleeve is installed on the screw, a lifting plate is fixed on the screw sleeve, and corresponding sample metal sheet bayonet grooves are provided on the lifting plate and the bottom plate, and the sample metal sheet bayonet groove is in the shape of a strip groove.

2. The automatic bending device for asphalt brittle point test specimens according to claim 1, characterized in that: The support frame includes a column and a top plate, the lower end of the column is connected to the bottom plate, the upper end of the column is connected to the top plate, the driving motor is fixed on the top plate, the lifting plate is provided with a guide hole, the column is passed through the guide hole, and plays the role of guiding and stabilizing the lifting plate.

3. The automatic bending device for asphalt brittle point test specimens according to claim 2, characterized in that: There are four columns in total, which are evenly distributed between the top plate and the bottom plate.

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