Device for measuring needle penetration of modified asphalt and use method of device

Abstract

The invention belongs to the technical field of material detection, and relates to a modified asphalt penetration measuring device and a use method thereof.The modified asphalt penetration measuring device is characterized in that the lower side of an installation frame is connected with a first limiting rod, and the farthest distance between the center of a standard needle installed on a measuring head assembly and the lower end of the first limiting rod is larger than or equal to 10 mm; the lowest point of the first limiting rod is higher than a standard needle installed on the measuring head assembly, two opposite second limiting rods are arranged on the installation frame in a sliding mode, and the two second limiting rods are located on the two sides of the position between the second limiting rods and the standard needle on the measuring head assembly respectively. The distance between the test point of the standard needle on the asphalt and the edge of the sample container is greater than or equal to 10mm by utilizing the limiting of the limiting rod I, so that the edge effect is avoided, the test point is close to the central area of the asphalt, and the measurement precision is improved; besides, the two limiting rods II are used for centering, limiting and stabilizing the sample containing vessel, so that the distance between the test points can be ensured to be greater than or equal to 10mm only by ensuring that the angle between the adjacent standard needles is close to 120 degrees, and mutual influence is avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of material detection, and in particular, relates to a device for measuring the needle penetration of modified asphalt and a method for using the device. Background Art

[0002] Modified asphalt is a type of asphalt that adds different materials to ordinary asphalt to improve its performance. This type of asphalt has higher durability, better temperature stability and stronger fatigue resistance, and is widely used in road construction and waterproofing projects.

[0003] Needle penetration is one of the important indicators to measure the hardness of asphalt. It is determined by measuring the depth of a standard needle vertically inserted into an asphalt sample under certain conditions (such as time, temperature and load). For modified asphalt, accurate measurement of its needle penetration helps to evaluate the quality and applicability of the material and ensure that its performance meets the requirements under different environmental conditions.

[0004] For example, the patent with patent announcement number CN106525660B discloses an asphalt needle penetration meter and its use method. The asphalt needle penetration meter is provided with a mesh support for placing a sample dish through the inside of the heat-conducting ceramic inner shell. When measuring the needle penetration, the standard needle approaches the surface of the sample dish, and then the synchronization button is pressed, and the standard needle and the load fall simultaneously for 5 seconds; although the needle penetration measurement can be completed normally, the human eye is required to observe the distance between each test point and the distance between the test point and the edge of the sample dish, and it cannot assist in adjusting the position of the sample dish. If the measurement points are too close, it will cause mutual influence. If the measurement point is too close to the edge of the sample dish, it will cause edge effect, affecting the measurement accuracy.

[0005] In view of the shortcomings of the above-mentioned prior art, a device for measuring the needle penetration of modified asphalt and a method for using the same have been designed to overcome the shortcomings of the prior art, thereby avoiding the distance between the test point and the edge of the sample dish being too close, and also avoiding the distance between the measuring points being too close, thereby preventing edge effects and mutual influences, and improving the measurement accuracy. Summary of the invention

[0006] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and to provide a device and a method for measuring the needle penetration of modified asphalt, which can avoid the distance between the test point and the edge of the sample dish being too close, and also avoid the distance between the measuring points being too close, prevent edge effects and mutual influences, and improve the measurement accuracy.

[0007] To solve the above technical problems, the present invention provides a measuring device for the penetration of modified pitch, which includes a main control console, a flat-bottomed container provided on the main control console, and a lifting drive group. A support member for supporting a sample dish is provided in the flat-bottomed container. The support member raises the lower side of the sample dish loaded with pitch to a distance of 50 mm from the bottom of the flat-bottomed container, and the distance between the lower side of the sample dish on the support member and the water surface of the constant-temperature water in the flat-bottomed container is 100 mm. The lifting member of the lifting drive group is provided with a measuring head assembly above the flat-bottomed container through a mounting frame. The measuring head assembly is used to mount a standard needle and measure the penetration of the pitch in the sample dish with the standard needle. A first limiting rod is connected to the lower side of the mounting frame and is located directly to the right of the standard needle on the measuring head assembly. The lower end of the first limiting rod extends vertically upward above the flat-bottomed container. The maximum distance between the center of the standard needle mounted on the measuring head assembly and the lower end of the first limiting rod is ≥ 10 mm. The lowest point of the first limiting rod is higher than the lowest point of the standard needle mounted on the measuring head assembly. Two front and rear opposite second limiting rods slide on the mounting frame. The front and rear two second limiting rods are respectively located on the front and rear sides of the position between the second limiting rod and the standard needle on the measuring head assembly. The two second limiting rods are driven to move towards each other by a linear drive group. The linear drive group is provided on the mounting frame. The lowest point of the second limiting rod is lower than the lowest point of the standard needle mounted on the measuring head assembly.

[0008] Preferably, the linear drive group includes two left and right opposite guide rails connected to the mounting frame. A rack slides on each side of the two guide rails close to each other. The front and rear two second limiting rods are respectively connected to the left and right racks. A gear meshing between the two racks rotates on the mounting frame. A drive motor is mounted on the mounting frame, and the output shaft of the drive motor is connected to the gear.

[0009] Preferably, the lifting drive group includes a guide post connected to the main control console. A lead screw is rotatably provided on the guide post through two upper and lower opposite bearings. A nut that slides on the guide post is threadedly connected to the lead screw. One side of the nut is connected to the mounting frame. A servo motor is mounted on the guide post.

[0010] Preferably, the support member includes two front and rear opposite guide beams connected to the inner wall of the flat-bottomed container. The extending directions of the two guide beams are both parallel to the connection line between the standard needle on the measuring head assembly and the first limiting rod. A sliding sleeve slides between the sides of the two guide beams close to each other. A support disk for supporting the sample dish rotates on the sliding sleeve. The center of the support disk coincides with the infinitely extending line between the standard needle on the measuring head assembly and the first limiting rod. The middle part of the support disk is recessed downward to form a support groove for placing the sample dish. A plurality of through holes for the circulation of constant-temperature water are opened on the support groove of the support disk. Three limiting blocks adapted to limit the sample dish are connected to the support groove of the support disk.

[0011] Preferably, the support member further includes three circumferentially and evenly spaced clamping blocks embedded and slidably disposed on the sliding sleeve. A first spring located inside the sliding sleeve is connected between the clamping blocks and the sliding sleeve. The first spring is used to reset the slidable clamping blocks. Three circumferentially and evenly spaced clamping grooves are formed on the support disc, and the three clamping grooves are correspondingly engaged with the three clamping blocks one by one.

[0012] Preferably, the measuring head assembly includes a mounting post connected to the mounting frame. The lower part of the mounting post is connected with a mounting block. A needle connecting rod for mounting a standard needle is slidably disposed on the mounting block. A clamping sleeve surrounding the needle connecting rod is slidably disposed on the mounting block. One side inside the clamping sleeve bulges to contact and cooperate with the outer side of 2 / 1 of the needle connecting rod. The left and right sides of the clamping sleeve are respectively a button part and a magnetic attracting part. A second spring surrounding the magnetic attracting part is connected between the clamping sleeve and the mounting block. The second spring is used to reset the slid clamping sleeve. An electromagnet adapted to magnetically cooperate with the magnetic attracting part is mounted on the mounting post. A laser rangefinder is mounted on the upper left side of the mounting post.

[0013] Preferably, the needle connecting rod includes a rod sleeve slidable on the mounting block. A socket adapted for inserting the standard needle is formed at the lower end of the rod sleeve. A fastening bolt is threadedly connected to the socket of the rod sleeve. A part of the lower part of the rod sleeve protrudes. A weight surrounding the rod sleeve is supported at the protruding part of the rod sleeve. The weight is used to increase the weight. A receiving cavity is formed at the upper part of the rod sleeve. A counterweight is placed in the receiving cavity of the rod sleeve. A T-shaped nut for blocking the upper receiving cavity of the rod sleeve is threadedly connected to the upper end of the rod sleeve.

[0014] Preferably, an electric guide rail is further mounted inside the mounting post. A lifting plate slidably penetrating the mounting post is connected to the slider of the electric guide rail. The lifting plate is located below the T-shaped nut. A contact sensor is embedded and mounted on the upper side of the lifting plate. The contact sensor is electrically connected to a controller in the main control console. The electromagnet is also electrically connected to the controller in the main control console. Initially.

[0015] The present invention also provides a usage method of a measuring device for the penetration of modified pitch according to the above, including: S1) Install the standard needle on the measuring head assembly, and place the sample dish filled with pitch on the support member in the flat-bottomed container; S2) Control the lifting drive group to drive the measuring head assembly to move downward and drive the standard needle to move downward to be close to the upper surface of the pitch in the sample dish, and at the same time, the second limiting rod moves downward to the inner ring of the sample dish; S3) Adjust the position of the sample dish so that the inner wall of the sample dish contacts the outer side of the first limiting rod, and use the first limiting rod to make the distance between the test point of the standard needle on the pitch and the edge of the sample dish ≥ 10 mm; S4) The two second limiting rods approach each other to center and align the sample dish, and use the cooperation of the first limiting rod to limit the front-back position and left-right position of the sample dish; S5) Make the standard needle vertically drop for 5 seconds under a load of 100 grams through the operation of the measuring head assembly to measure the penetration of the pitch; S6) After the measurement is completed, make the measuring head assembly release the standard needle, and control the lifting drive group to drive the measuring head assembly to move upward and reset.

[0016] Based on overcoming the shortcomings of the prior art, the beneficial effects that the present invention can achieve are as follows: 1. By using the limit of the first limit rod, the distance between the test point of the standard needle on the asphalt and the edge of the sample dish is ≥10 mm, avoiding the edge effect, ensuring that the test point is close to the central area of the asphalt, and improving the measurement accuracy; in addition, the two second limit rods center and limit the sample dish to ensure stability. Therefore, as long as the angle between adjacent standard needles is close to 120°, it can be ensured that the distance between each test point is ≥10 mm, avoiding mutual influence.

[0017] 2. After each standard needle is used up, directly rotate the support disk, and use the cooperation of the clamping block and the clamping groove to achieve an automatic 120° rotation and positioning effect, accurately ensuring that the angular interval between the three standard needles is 120°, avoiding the distance between different test points being too close and affecting each other, ensuring that each measured value is independent and accurate, and the operation is convenient, eliminating the cumbersome manual step of rotating and adjusting the sample dish, avoiding the inaccuracy caused by naked eye observation, and also eliminating the need to rely on external measuring tools.

[0018] 3. Under the cooperation of the lifting plate and the contact sensor, the needle connecting rod is automatically and stably lifted and reset. There is no need to manually press the button part or manually support the needle connecting rod to move up, avoiding the accidental downward movement of a small distance when manually contacting the needle connecting rod, which may affect the standard needle on the asphalt, with high automation and accuracy. Description of the Drawings

[0019] Figure 1 It is an assembly schematic diagram of the present invention.

[0020] Figure 2 It is the front view of the present invention.

[0021] Figure 3 It is a schematic diagram of the present invention in the upward viewing direction of the mounting frame, mounting column and mounting block.

[0022] Figure 4 It is a top view of the prior art sample dish and standard needle and the first limit rod and the second limit rod of the present invention.

[0023] Figure 5 It is a cross-sectional view of the flat-bottomed container of the present invention.

[0024] Figure 6 It is a cross-sectional view of the sliding sleeve of the present invention.

[0025] Figure 7 It is a schematic diagram of the support disk and the limit block of the present invention.

[0026] Figure 8 It is a cross-sectional view of the mounting column and the mounting block of the present invention.

[0027] Figure 9 This is a top view of the rod sleeve, clamping sleeve and spring two of the present invention.

[0028] Figure 10 This is a cross-sectional view of the rod sleeve and weight of the present invention.

[0029] Figure 11 This is the present invention Figure 8 An enlarged view of part A.

[0030] The reference signs in the attached drawings provided by the present invention are: 01 - sample dish, 02 - standard needle, 1 - main console, 11 - flat-bottomed container, 12 - guide beam, 13 - sliding sleeve, 131 - clamping block, 132 - spring one, 14 - support plate, 141 - card slot, 15 - limit block, 2 - lifting drive group, 21 - guide post, 22 - bearing, 23 - lead screw, 24 - servo motor, 25 - nut, 3 - mounting bracket, 4 - measuring head assembly, 41 - mounting post, 42 - mounting block, 43 - needle connecting rod, 431 - rod sleeve, 432 - fastening bolt, 433 - weight, 434 - counterweight, 435 - T-shaped nut, 44 - clamping sleeve, 441 - button part, 442 - magnetic attraction part, 45 - spring two, 46 - electromagnet, 47 - laser rangefinder, 51 - limit rod one, 52 - guide rail, 53 - rack, 54 - limit rod two, 55 - gear, 56 - drive motor, 61 - electric guide rail, 62 - lifting plate, 63 - contact sensor. Detailed implementation manners

[0031] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the attached drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0032] In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. The technical solutions of the present invention will be clearly and completely described below with reference to the attached drawings. It should be noted that the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0033] A measuring device for the penetration of modified pitch, as Figures 1 - 4As shown in the figure, it includes a main console 1, a flat-bottomed container 11 provided on the main console 1, and a lifting drive group 2. A support member for supporting the sample dish 01 is provided inside the flat-bottomed container 11. The support member raises the lower side of the sample dish 01 loaded with asphalt to a distance of 50 mm from the bottom of the flat-bottomed container 11. In practice, this distance can also be > 50 mm. And the distance between the lower side of the sample dish 01 on the support member and the water surface of the constant-temperature water in the flat-bottomed container 11 is 100 mm. In practice, this distance can also be > 100 mm, so as to avoid local overheating or uneven cooling of the sample dish 01. The lifting member of the lifting drive group 2 is provided with a measuring head assembly 4 above the flat-bottomed container 11 through a mounting bracket 3. The measuring head assembly 4 is used to install the standard needle 02 and make the standard needle 02 measure the penetration of the asphalt in the sample dish 01. Control the lifting drive group 2 to drive the mounting bracket 3 to drive the measuring head assembly 4 and the standard needle 02 mounted on the measuring head assembly 4 to move downward until the tip of the standard needle 02 moves downward to be close to the upper surface of the asphalt in the sample dish 01. Then, it can start to make the standard needle 02 vertically drop for 5 seconds under a load of 100 grams under the operation of the measuring head assembly 4 to measure the penetration of the asphalt. The lower side of the mounting bracket 3 is connected with a first limiting rod 51 located directly to the right of the standard needle 02 on the measuring head assembly 4. The lower end of the first limiting rod 51 extends vertically upward above the flat-bottomed container 11. The maximum distance between the center of the standard needle 02 mounted on the measuring head assembly 4 and the lower end of the first limiting rod 51 is ≥ 10 mm (such as Figure 4 ). During the process of the mounting bracket 3 driving the tip of the standard needle 02 to move downward to be close to the upper surface of the asphalt in the sample dish 01, the mounting bracket 3 will also drive the second limiting rod 54 to move downward to the inner circle of the sample dish 01. At this time, move and adjust the position of the sample dish 01 so that the center of the sample dish 01 is aligned with the center of the standard needle 02 in the left-right direction and move along the left side of the standard needle 02 until the inner wall of the sample dish 01 contacts the outer side of the first limiting rod 51. At this time, it means that the distance between the test point of the standard needle 02 on the asphalt and the edge of the sample dish 01 is ≥ 10 mm, so as to avoid the edge effect, ensure that the test point is close to the central area of the asphalt, and improve the measurement accuracy. The lowest point of the first limiting rod 51 is higher than the lowest point of the standard needle 02 mounted on the measuring head assembly 4. In this way, even if the mounting bracket 3 drives the standard needle 02 to move downward to be close to the upper surface of the asphalt, the first limiting rod 51 will not interfere with the asphalt in the sample dish 01. Then during the measurement, make the standard needle 02 vertically drop for 5 seconds under a load of 100 grams under the operation of the measuring head assembly 4. At this time, the position of the first limiting rod 51 remains unchanged. There are two second limiting rods 54 sliding on the mounting bracket 3 that are opposite to each other front and back. The two front and back second limiting rods 54 are respectively located on the front and back sides of the position between the second limiting rod 54 and the standard needle 02 on the measuring head assembly 4. The linear drive group drives the two second limiting rods 54 to move towards each other. During the process of the mounting bracket 3 driving the tip of the standard needle 02 to move downward to be close to the upper surface of the asphalt in the sample dish 01, the mounting bracket 3 will also drive the two front and back second limiting rods 54 to move downward to the front and back outer sides of the sample dish 01 respectively (such as Figure 4), and then move and adjust the position of the sample dish 01. When the inner wall of the sample dish 01 contacts the outer side of the first limiting rod 51, control the linear drive group to drive the two second limiting rods 54 to approach each other. The front second limiting rod 54 will squeeze the sample dish 01 to move forward, and the rear second limiting rod 54 will squeeze the sample dish 01 to move backward, so as to automatically and accurately center the sample dish 01, thereby ensuring that the distance between the test point of the standard needle 02 on the asphalt and the edge of the sample dish 01 is ≥ 10 mm, eliminating the cumbersome manual calibration steps. And the two second limiting rods 54 will gradually limit the front and rear positions and left and right positions of the sample dish 01 under the squeezing cooperation of the first limiting rod 51 inside the sample dish 01, thus cleverly improving the stability of asphalt penetration measurement. The linear drive group is arranged on the mounting frame 3, and the lowest point of the second limiting rod 54 is lower than the lowest point of the standard needle 02 mounted on the measuring head assembly 4, so that after the second limiting rod 54 moves downward, more parts can contact the sample dish 01 when squeezing the sample dish 01; in addition, when multiple measurement points need to be measured, rotate and adjust the angle of the sample dish 01 on the support of the flat-bottom container 11. Due to the action of the first limiting rod 51 and the second limiting rod 54, it can still be ensured that the distance between the test point of each standard needle 02 on the asphalt and the edge of the sample dish 01 is ≥ 10 mm. On the basis of the above limits, and because the specifications of the sample dish 01 are mostly the same, so as long as the angles of adjacent standard needles 02 are close to 120°, it can be further ensured that the distance between each test point is ≥ 10 mm.

[0034] As Figure 2 and Figure 3 shown, the linear drive group includes two left-right opposite guide rails 52 connected to the mounting frame 3. On the side where the two guide rails 52 approach each other, racks 53 are slidably arranged. The front and rear second limiting rods 54 are respectively connected to the left and right racks 53. Therefore, when the racks 53 move, they can drive the second limiting rods 54 to move. A gear 55 meshing between the two racks 53 is rotatably arranged on the mounting frame 3. The rotation of the gear 55 will drive the two racks 53 to move away from each other. The two racks 53 will drive the two second limiting rods 54 to move away from each other to adjust the position. When the racks 53 reverse, the two racks 53 will approach each other and drive the two second limiting rods 54 to approach each other to center and squeeze the sample dish 01. A drive motor 56 is installed on the mounting frame 3, and the output shaft of the drive motor 56 is connected to the gear 55. Control the drive motor 56 to drive the gear 55 to rotate, so as to automatically drive the two second limiting rods 54 to move towards each other.

[0035] As Figure 2As shown in the figure, the lifting drive group 2 includes a guide post 21 connected to the host console 1. The guide post 21 is rotatably provided with a lead screw 23 through two vertically opposite bearings 22. A nut 25 that slides on the guide post 21 is threadedly connected to the lead screw 23. One side of the nut 25 is connected to the mounting bracket 3. When the lead screw 23 rotates, it will drive the nut 25 to drive the mounting bracket 3 to lift and lower. A servo motor 24 is installed on the guide post 21, and the output shaft of the servo motor 24 is connected to the lead screw 23, and the lead screw 23 is driven to rotate by the servo motor 24.

[0036] As Figures 5 - 7 shown, the support member includes two front and rear opposite guide beams 12 connected to the inner wall of the flat-bottomed container 11. The extending directions of the two guide beams 12 are both parallel to the connection line between the standard needle 02 and the first limiting rod 51 on the measuring head assembly 4. A sliding sleeve 13 slides between the sides of the two guide beams 12 close to each other. A support disk 14 for supporting the sample dish 01 is rotatably provided on the sliding sleeve 13. The center of the support disk 14 coincides with the infinitely extending line between the standard needle 02 and the first limiting rod 51 on the measuring head assembly 4, so that the sliding sleeve 13 drives the sample dish 01 to move left and right through the support disk 14. When adjusting the position of the sample dish 01 in this way, by using the front and rear limiting functions of the guide beams 12 and the center positioning function of the support disk 14, it is ensured that the center of the sample dish 01 is aligned with the center of the standard needle 02 in the left-right direction. And when the sample dish 01 moves left and contacts the outer side of the first limiting rod 51, the measuring point of the standard needle 02 on the asphalt in the sample dish 01 can also automatically correspond to the connection line from the edge of the sample dish 01 to the center of the sample dish 01, so as to accurately ensure that the distance between the test point of the standard needle 02 on the asphalt and the edge of the sample dish 01 is ≥10 mm. This method eliminates the operation of manually swinging the sample dish 01 back and forth. Moreover, rotating the support disk 14 can also drive the sample dish 01 to rotate and adjust the angle. On the basis of ensuring that the distance between the test point of the standard needle 02 on the asphalt and the edge of the sample dish 01 is ≥10 mm, multiple penetration measurements can be conveniently carried out; the middle part of the support disk 14 is recessed downward to form a support groove for placing the sample dish 01. A plurality of through holes for the circulation of constant temperature water are opened on the support groove. Three limiting blocks 15 suitable for limiting the sample dish 01 are connected to the support groove of the support disk 14. The sample dish 01 loaded with asphalt is placed in the support groove of the support disk 14, and the sample dish 01 is limited by the three limiting blocks 15 in this way.

[0037] As Figure 6 and Figure 7As shown, the support member further includes three clamping blocks 131 that are embedded and slidably arranged on the sliding sleeve 13 and are circumferentially and evenly spaced. A first spring 132 located inside the sliding sleeve 13 is connected between the clamping blocks 131 and the sliding sleeve 13. The first spring 132 is used to reset the slidable clamping blocks 131. Three card slots 141 that are circumferentially and evenly spaced are formed on the support disk 14. The three card slots 141 are correspondingly engaged with the three clamping blocks 131 one by one. When the penetration degrees are sequentially measured on the asphalt in the same sample dish 01 using three standard needles 02, after each use of a standard needle 02, the support disk 14 is directly rotated. The card slots 141 of the support disk 14 will squeeze the clamping blocks 131 to slide and retract into the sliding sleeve 13. When the support disk 14 rotates 120°, the squeezed clamping blocks 131 will pop out under the action of the first spring 132 and be clamped on another card slot 141, thereby achieving an automatic positioning effect, accurately ensuring an angular interval of 120° between the three standard needles 02, avoiding the mutual influence due to the too-close distance between different test points, ensuring the independence and accuracy of each measurement value, being convenient to operate, eliminating the cumbersome steps of manually rotating and adjusting the sample dish 01, avoiding the inaccuracy caused by visual observation, and also eliminating the need to rely on external measuring tools.

[0038] As Figure 2 , Figure 3 , Figure 8 and Figure 9As shown, the measuring head assembly 4 includes a mounting post 41 connected to the mounting bracket 3. The lower part of the mounting post 41 is connected with a mounting block 42. A needle connecting rod 43 for mounting the standard needle 02 slides on the mounting block 42. The needle connecting rod 43 is adapted to vertically move downward along the mounting block 42 under the action of gravity, and make the standard needle 02 vertically drop under a load of 100 grams to insert into the asphalt in the sample dish 01. A jacket 44 surrounding the needle connecting rod 43 slides on the mounting block 42. One side inside the jacket 44 bulges to contact and cooperate with the outer side of 2 / 1 of the needle connecting rod 43. The left and right sides of the jacket 44 are respectively a button part 441 and a magnetic attraction part 442. A second spring 45 surrounding the magnetic attraction part 442 is connected between the jacket 44 and the mounting block 42. The second spring 45 is used to reset the slid jacket 44. An electromagnet 46 adapted to magnetically cooperate with the magnetic attraction part 442 is mounted on the mounting post 41. Initially, the bulge on the jacket 44 presses the needle connecting rod 43 against the mounting block 42 under the action of the second spring 45. When the standard needle 02 needs to vertically drop for 5 seconds for penetration measurement, control the electromagnet 46 to magnetically adsorb the magnetic attraction part 442. The magnetic attraction part 442 will drive the jacket 44 to move rightward to release the needle connecting rod 43, and the standard needle 02 will immediately vertically drop. After 5 seconds, the electromagnet 46 is powered off, and the jacket 44 will move leftward under the action of the second spring 45 to clamp the needle connecting rod 43 again, thus completing the operation of the standard needle 02 vertically dropping for 5 seconds for penetration measurement. At this time, it is necessary to calculate the depth of the standard needle 02 vertically inserted into the asphalt sample. A laser rangefinder 47 is mounted on the upper left side of the mounting post 41. The laser rangefinder 47 can be used to measure the distance that the mounting post 41 moves downward within 5 seconds to obtain the depth of the standard needle 02 vertically inserted into the asphalt sample. If it is necessary to move the needle connecting rod 43 upward to reset, press the button part 441 to drive the jacket 44 to move rightward to release the needle connecting rod 43, and then drive the needle connecting rod 43 to move upward to reset until the weight 433 abuts against the lower side of the mounting block 42 and cannot move upward further. Then release the pressing part, and the jacket 44 will reset and clamp the needle connecting rod 43 under the action of the second spring 45, thereby completing the reset of the needle connecting rod 43.

[0039] As Figure 10As shown in the figure, the needle connecting rod 43 includes a rod sleeve 431 that slides on the mounting block 42. The lower end of the rod sleeve 431 is provided with a socket adapted for inserting the standard needle 02. A fastening bolt 432 is threadedly connected to the socket of the rod sleeve 431. Tightening the fastening bolt 432 can fix the standard needle 02 on the socket of the rod sleeve 431, and loosening the fastening bolt 432 can release the standard needle 02. Part of the lower part of the rod sleeve 431 protrudes, and a weight 433 surrounding the rod sleeve 431 is supported at the protruding part of the rod sleeve 431. The weight 433 is used to increase the weight. An accommodation cavity is opened at the upper part of the rod sleeve 431, and a counterweight 434 is placed in the accommodation cavity of the rod sleeve 431. A T-shaped nut 435 for blocking the upper accommodation cavity of the rod sleeve 431 is threadedly connected to the upper end of the rod sleeve 431. The 100-gram load during the measurement of asphalt penetration is composed of the weights of the standard needle 02, the rod sleeve 431, the fastening bolt 432, the weight 433, the counterweight 434, and the T-shaped nut 435. The weight of the needle connecting rod 43 is adjusted by the replaceable weight 433 and counterweight 434 to ensure the normal operation of the asphalt penetration measurement.

[0040] As Figure 8 and Figure 11 shown in the figure, it further includes an electric guide rail 61 installed inside the mounting column 41. A lifting plate 62 that slides through the mounting column 41 is connected to the slider of the electric guide rail 61. The lifting plate 62 is located below the T-shaped nut 435. A contact sensor 63 is embedded and installed on the upper side of the lifting plate 62. The contact sensor 63 is electrically connected to the controller in the main console 1, and the electromagnet is also electrically connected to the controller in the main console 1. Initially, the contact sensor 63 is pressed by the T-shaped nut 435, the electromagnet 46 is in the off state, and the jacket 44 clamps the needle connecting rod 43. If it is necessary for the needle connecting rod 43 to move downward along the mounting block 42 for 5 seconds and drive the standard needle 02 to insert into the asphalt, first control the electric guide rail 61 to drive the lifting plate 62 to drive the contact sensor 63 to move downward quickly away from the T-shaped nut 435. The lifting plate 62 will move down to the threshold value, and then the contact sensor 63 will control the electromagnet 46 to be energized for 5 seconds through the controller in the main console 1 to complete the insertion of the standard needle 02. When the standard needle 02 is removed from the needle connecting rod 43 and it is necessary to move the needle connecting rod 43 upward to reset, control the electric guide rail 61 to drive the lifting plate 62 to drive the contact sensor 63 to move upward. When the contact sensor 63 moves upward and contacts the T-shaped nut 435 again, the electromagnet 46 is energized for 5 seconds again, and the jacket 44 releases the needle connecting rod 43. At this time, the upward-moving lifting plate 62 can drive the needle connecting rod 43 to move upward and reset through the T-shaped nut 435. During the process of the needle connecting rod 43 moving upward and resetting, there is no need to manually press the button part 441, nor is it necessary to manually support the needle connecting rod 43 to move upward, avoiding the accidental downward movement of a small distance when manually contacting the needle connecting rod 43, which may affect the standard needle 02 on the asphalt. It has high automation and accuracy, and is convenient to operate.

[0041] A method for using a measuring device for the penetration of the modified pitch according to the above, comprising: S1) Install the standard needle 02 on the measuring head assembly 4, and place the sample dish 01 containing pitch on the support member in the flat-bottomed container 11; S2) Control the lifting drive group 2 to drive the measuring head assembly 4 to move downward and drive the standard needle 02 to move downward to be close to the upper surface of the pitch in the sample dish 01. At the same time, the second limiting rod 54 moves downward to the inner ring of the sample dish 01; S3) Adjust the position of the sample dish 01 so that the inner wall of the sample dish 01 contacts the outer side of the first limiting rod 51, and use the first limiting rod 51 to make the distance between the test point of the standard needle 02 on the pitch and the edge of the sample dish 01 ≥ 10 mm; S4) The two second limiting rods 54 approach each other to center and align the sample dish 01, and use the cooperation of the first limiting rod 51 to limit the front-back position and left-right position of the sample dish 01; S5) Through the operation of the measuring head assembly 4, the standard needle 02 vertically drops for 5 seconds under a load of 100 grams to measure the penetration of the pitch; S6) After the measurement is completed, make the measuring head assembly 4 release the standard needle 02, and control the lifting drive group 2 to drive the measuring head assembly 4 to move upward and reset.

[0042] Obviously, the embodiments described above are only a part of the embodiments of the present invention, rather than all the embodiments. It only expresses the preferred implementation mode of the present invention, and the description is relatively specific and detailed, but it cannot be construed as a limitation on the scope of the patent of the present invention.

[0043] It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations, quantity increases or decreases, improvements and substitutions can be made. Therefore, based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of protection of the present invention.

Claims

1. A measuring device for the penetration of modified pitch, comprising a main control console (1), a flat-bottomed container (11) arranged on the main control console (1), and a lifting drive group (2). A support member for supporting a sample dish (01) is arranged in the flat-bottomed container (11); a lifting member of the lifting drive group (2) is provided with a measuring head assembly (4) located above the flat-bottomed container (11) through a mounting bracket (3), and the measuring head assembly (4) is used for mounting a standard needle (02); it is characterized in that, It further includes: a first limiting rod (51) is connected to the lower side of the mounting bracket (3), the maximum distance between the center of the standard needle (02) mounted on the measuring head assembly (4) and the lower end of the first limiting rod (51) ≥ 10 mm, the lowest point of the first limiting rod (51) is higher than the standard needle (02) mounted on the measuring head assembly (4), two opposite second limiting rods (54) slide on the mounting bracket (3), and the two second limiting rods (54) are respectively located on both sides of the position between the second limiting rod (54) and the standard needle (02) on the measuring head assembly (4), and the two second limiting rods (54) are driven to move towards each other by a linear driving group, the linear driving group is arranged on the mounting bracket (3), and the lowest point of the second limiting rod (54) is lower than the standard needle (02) mounted on the measuring head assembly (4).

2. The measuring device for the penetration of modified pitch according to claim 1, characterized in that, The linear driving group includes two opposite guide rails (52) connected to the mounting bracket (3), a rack (53) slides on one side of the guide rail (52), the two second limiting rods (54) are respectively connected to the two racks (53), a gear (55) meshing between the two racks (53) rotates on the mounting bracket (3), and a driving motor (56) is mounted on the mounting bracket (3), and the output shaft of the driving motor (56) is connected to the gear (55).

3. The measuring device for the penetration of modified pitch according to claim 1, wherein, The lifting driving group (2) includes a guide post (21) connected to the main console (1), a lead screw (23) is rotatably provided on the guide post (21) through a bearing (22), a nut (25) that slides on the guide post (21) is threadedly connected to the lead screw (23), one side of the nut (25) is connected to the mounting bracket (3), and a servo motor (24) is mounted on the guide post (21).

4. A measuring device for the penetration of modified pitch according to claim 1, characterized in that, The support member includes a guide beam (12) connected to the inner wall of the flat-bottomed container (11), the extending direction of the guide beam (12) is parallel to the connection line between the standard needle (02) on the measuring head assembly (4) and the first limiting rod (51), a sliding sleeve (13) slides on one side of the guide beam (12), a support disk (14) for supporting the sample dish (01) rotates on the sliding sleeve (13), and the center of the support disk (14) coincides with the infinite extension line between the standard needle (02) on the measuring head assembly (4) and the first limiting rod (51); the middle part of the support disk (14) is recessed downward to form a support groove for placing the sample dish (01), a plurality of through holes are opened on the support groove, and three limiting blocks (15) suitable for limiting the sample dish (01) are connected to the support groove of the support disk (14).

5. The measuring device for the penetration of modified pitch according to claim 4, characterized in that, The support member further includes three clamping blocks (131) arranged at equal circumferential intervals and sliding on the sliding sleeve (13), a first spring (132) is connected between the clamping block (131) and the sliding sleeve (13), and three circumferentially spaced slots (141) are opened on the support disk (14), and the three slots (141) are correspondingly matched with the three clamping blocks (131).

6. The measuring device for the penetration of modified pitch according to claim 1, characterized in that, The measuring head assembly (4) includes a mounting post (41) connected to the mounting bracket (3). The lower part of the mounting post (41) is connected with a mounting block (42). A needle connecting rod (43) for mounting a standard needle (02) slides on the mounting block (42). A jacket (44) surrounding the needle connecting rod (43) slides on the mounting block (42). One side inside the jacket (44) bulges to contact and cooperate with the needle connecting rod (43). The two sides of the jacket (44) are respectively a button part (441) and a magnetic attraction part (442). A second spring (45) is connected between the jacket (44) and the mounting block (42). An electromagnet (46) adapted to magnetically cooperate with the magnetic attraction part (442) is mounted on the mounting post (41). A laser rangefinder (47) is mounted on the upper part of the mounting post (41).

7. The measuring device for the penetration of modified pitch according to claim 6, characterized in that, The needle connecting rod (43) includes a rod sleeve (431) sliding on the mounting block (42). The lower end of the rod sleeve (431) is provided with a socket adapted for the standard needle (02) to be inserted. A fastening bolt (432) is threadedly connected at the socket of the rod sleeve (431). A part of the lower part of the rod sleeve (431) protrudes. A weight (433) surrounding the rod sleeve (431) is supported at the protruding part of the rod sleeve (431). The weight (433) is used to increase the weight. A receiving cavity is opened in the upper part of the rod sleeve (431). A counterweight (434) is placed in the receiving cavity of the rod sleeve (431). A T-shaped nut (435) for blocking the upper receiving cavity of the rod sleeve (431) is threadedly connected to the upper end of the rod sleeve (431).

8. The measuring device for the penetration of modified pitch according to claim 7, characterized in that, It further includes an electric guide rail (61) mounted on the mounting post (41). A lifting plate (62) is connected to the slider of the electric guide rail (61). The lifting plate (62) is located below the T-shaped nut (435). A contact sensor (63) is mounted on the lifting plate (62). The contact sensor (63) is electrically connected to the controller in the host console (1). The electromagnet is also electrically connected to the controller in the host console (1). Initially.

9. A method for using a measuring device for the penetration of modified pitch according to claim 1, characterized in that, It includes: S1) Mount the standard needle (02) on the measuring head assembly (4). Place the sample dish (01) filled with asphalt on the support on the flat-bottomed container (11). S2) Control the lifting drive group (2) to drive the measuring head assembly (4) to move downward and drive the standard needle (02) to move downward to be close to the upper surface of the asphalt in the sample dish (01). At the same time, the second limiting rod (54) moves downward to the inner circle of the sample dish (01). S3) Adjust the position of the sample dish (01) so that the inner wall of the sample dish (01) contacts the outer side of the first limiting rod (51). Use the first limiting rod (51) to make the distance between the test point of the standard needle (02) on the asphalt and the edge of the sample dish (01) ≥ 10 mm. S4) The two second limiting rods (54) approach each other to center and align the sample dish (01), and use the cooperation of the first limiting rod (51) to limit the front-back position and left-right position of the sample dish (01). S5) Through the operation of the measuring head assembly (4), the standard needle (02) drops vertically for 5 seconds under a load of 100 grams to measure the penetration of asphalt; S6) After the measurement is completed, the measuring head assembly (4) releases the standard needle (02), and the lifting drive group (2) is controlled to drive the measuring head assembly (4) to move upward and reset.

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