Pressure test device for aggregate crushing value test and test method

Abstract

The invention provides a pressure test device and a test method for an aggregate crushing value test, and belongs to the technical field of aggregate detection. The pressure test device comprises an equipment platform, a base plate and a press machine, the top of the base plate is fixedly provided with three supporting blocks, the equipment platform is provided with a transfer mechanism, the transfer mechanism comprises a lifting assembly and a moving assembly, and the lifting assembly is used for adjusting the height position of the moving assembly. The test method comprises the following steps: T1, screening the aggregate, removing particles which do not meet the particle size requirement, and weighing the aggregate with specified mass as a test sample; and T2, a round mold in the test mold is placed in a round groove in the base plate, and then the weighed aggregate is poured into the round groove. The pressure test device for the aggregate crushing value test, provided by the invention, has the advantages that the test mold can be automatically transferred to a preset position in the press machine, the test mold is accurately positioned, the aggregate can be automatically jolted, and the use is reliable.

Description

Technical Field

[0001] The present invention relates to the field of aggregate detection technology, and in particular to a pressure testing device and a testing method for aggregate crushing value testing. Background Art

[0002] The aggregate crushing value test is an important test method for evaluating the mechanical properties of aggregates. It is mainly used to measure the ability of aggregates to resist crushing under gradually increasing loads. It is a key indicator for aggregate quality testing in engineering fields such as roads and construction. The basic process of this test is: the prepared aggregate sample is loaded into a test mold of specific specifications, and a specified pressure is applied to the pressure head of the test mold through a press to make the aggregate bear the compression load, and then the crushing value is calculated based on the change in the aggregate particle grading after crushing, so as to judge the strength and applicability of the aggregate. Before applying pressure, the position of the test mold needs to be adjusted so that the axis of the test mold coincides with the axis of the press head as much as possible. This can make the force on the aggregate more uniform and improve the accuracy of the test results. However, the existing test operation relies on manually placing the test mold under the pressure head of the press. After the test mold is placed, the test personnel need to observe the relative position of the test mold and the pressure head closely after the pressure head of the press drops a certain distance. If the deviation is too large, the position of the test mold needs to be adjusted manually. Once equipment failure or operating error occurs in this operation mode, it is very easy to cause mechanical damage to the test personnel, and there is a great safety risk; on the other hand, the accuracy of manual observation and adjustment of the test mold position is limited, and it is difficult to ensure that the axis line of the test mold is accurately aligned with the axis line of the pressure head of the press, which may cause uneven force on the aggregate and affect the accuracy and reliability of the test results.

[0003] Therefore, it is necessary to provide a pressure testing device and test method for aggregate crushing value testing to solve the above technical problems. Summary of the invention

[0004] The technical problem solved by the present invention is to provide a pressure testing device and a testing method for testing the aggregate crushing value, which can automatically transfer the test mold to a predetermined position in a press, accurately position the test mold, automatically impact the aggregate, and use reliable aggregate crushing value.

[0005] To solve the above technical problems, the pressure test device for aggregate crushing value test provided by the present invention includes an equipment platform, a backing plate, and a press. The backing plate is fixedly installed on the top of the equipment platform, and the press is fixedly installed on the top of the backing plate. Three support blocks are fixedly installed on the top of the backing plate. A transfer mechanism is arranged on the equipment platform. The transfer mechanism includes a lifting component and a moving component. The lifting component is used to adjust the height position of the moving component. A positioning and placing table is installed on the moving component. The moving component is used to move the positioning and placing table above the three support blocks. A positioning groove is formed on the top of the positioning and placing table, and the positioning groove is used to place the test mold for aggregate crushing value test.

[0006] Preferably, a square opening is formed on the backing plate. A moving carrier plate is slidably installed in the square opening. The moving component is installed on the moving carrier plate. A lead screw is rotatably installed in the square opening. The lead screw penetrates through the moving carrier plate and is threadedly connected to the moving carrier plate. A first motor is fixedly installed on one side of the equipment platform. One end of the lead screw extends outside the equipment platform and is fixedly connected to the output end of the first motor.

[0007] Preferably, the lifting component includes a plurality of fixed columns, a supporting circular plate, an I-shaped platform, and a first hydraulic cylinder. The plurality of fixed columns are all fixedly installed on the bottom of the moving carrier plate. The supporting circular plate is fixedly installed at the bottom ends of the plurality of fixed columns. The I-shaped platform is slidably sleeved on the plurality of fixed columns. The top of the I-shaped platform extends above the equipment platform. The first hydraulic cylinder is fixedly installed on the top of the supporting circular plate. The output end of the first hydraulic cylinder is fixedly connected to the bottom of the I-shaped platform.

[0008] Preferably, the moving component includes a mounting seat, a transfer plate, a rack, a second motor, and a gear. The mounting seat is fixedly installed on the top of the I-shaped platform. The transfer plate penetrates through and is slidably installed in the mounting seat. The rack is fixedly installed on the top of the transfer plate. The second motor is fixedly installed on the mounting seat. The gear is fixedly sleeved on the output end of the second motor, and the gear meshes with the rack. Two front-end support bars are integrally formed at one end of the transfer plate close to the press. Two limiting round rods are fixedly installed on the top of each of the two front-end support bars. The positioning and placing table is slidably sleeved on the four limiting round rods.

[0009] Furthermore, two positioning stoppers are fixedly installed on the top of the backing plate.

[0010] Further, a bumping mechanism for bumping the test mold for aggregate crushing value test is also provided on the moving carrier plate and the positioning and placing table. The bumping mechanism includes a power assembly and two pushing assemblies. The two pushing assemblies are both installed on the positioning and placing table and are respectively located on both sides of the transfer plate, and the power assembly is installed on the moving carrier plate.

[0011] Preferably, the power assembly includes a rotating shaft, two cams and a third motor. The rotating shaft is rotatably installed on the top of the moving carrier plate. The two cams are both fixedly sleeved on the rotating shaft, and the phase difference between the two cams is 180°. The third motor is fixedly installed on the top of the moving carrier plate, and the output end of the third motor is fixedly connected to one end of the corresponding rotating shaft. Any one of the pushing assemblies includes two push rods, a receiving block and two first springs. A smooth hole communicating with the positioning groove is opened at the bottom of the positioning and placing table. The two push rods are both slidably installed in the corresponding smooth holes. The receiving block is fixedly installed at the bottom ends of the two push rods. The two first springs are respectively sleeved on the two push rods. The top ends of the two first springs are both fixedly connected to the positioning and placing table, and the bottom ends are both fixedly connected to the receiving block.

[0012] Further, a pressure control mechanism is also installed on the top of the equipment platform. The pressure control mechanism is used to prevent the circular mold in the test mold from shifting and jumping when bumping the aggregate. The pressure control mechanism includes a lifting carrier plate and two groups of pressure control units. The two groups of pressure control units are respectively installed at both ends of the lifting carrier plate. Each group of pressure control units includes three elastic claw members distributed in a fan shape. Each elastic claw member includes a sliding rod, a U-shaped claw and a second spring. The sliding rod penetrates and is slidably installed on the lifting carrier plate. The U-shaped claw is fixedly installed at the bottom end of the sliding rod. The second spring is sleeved on the sliding rod. The top end of the second spring is fixedly connected to the lifting carrier plate, and the bottom end is fixedly connected to the U-shaped claw.

[0013] Preferably, a pressure rod is fixedly installed on the outer wall of one side of the lifting carrier plate.

[0014] To solve the above problems, the present invention also provides a test method for aggregate crushing value test, including the following steps: T1: Screen the aggregate to remove the particles that do not meet the particle size requirements, and weigh a specified mass of the aggregate as the test sample. T2: Place the circular mold in the test mold in the circular groove on the chassis, and then pour the weighed aggregate into the circular groove. T3: Bump the test mold left and right 25 times to compact the aggregate, and then press the pressure head in the test mold into the circular mold. T4: Place the trial mold in the positioning slot on the positioning table, then start the transfer mechanism to move the trial mold to the predetermined position in the press; T5: Start the press and apply pressure to the pressure head of the test mold at the set loading rate until the maximum test load is reached and maintained for the specified time; T6: After the specified time is reached, stop loading the press, slowly unload the pressure, and return the press head to the initial position; T7: Start the transfer mechanism, reset the positioning table to the initial position, and then take out the test mold; T8: Pour the crushed aggregate in the test mold into a standard sieve for sieving to separate particles that meet the specified particle size requirements; T9: Weigh the mass of the aggregate under the sieve, calculate the crushing value of the aggregate according to the crushing value calculation formula in the test standard, and record the test results.

[0015] Compared with the related art, the pressure test device and test method for aggregate crushing value test provided by the present invention have the following beneficial effects: The present invention provides a pressure testing device for aggregate crushing value testing. Through the arrangement of a moving mechanism, a supporting block, and a positioning stopper, the horizontal and vertical positions of the test mold can be ensured to be accurately located, so that the axis center line of the test mold will not deviate too much from the axis center line of the pressure head of the press, and the test mold placement position has the advantage of high accuracy. At the same time, the test personnel can place the test mold in the positioning groove of the positioning placing table on the right side of the equipment platform, and the test mold is sent into the press through the transfer mechanism. There is no need to approach the press when applying pressure, thereby avoiding safety risks during operation and having the advantage of high safety. The present invention provides a pressure testing device for aggregate crushing value test. Through the setting of an impact mechanism composed of a power component and two push components, the phase difference of two cams on the power component is 180 degrees. During the cyclic rotation, the push rods and the resisting blocks on the two push components are alternately pushed up, so that the aggregate in the test mold can be impacted left and right in a cyclic manner, so that the aggregate is automatically and evenly compacted under the action of gravity and impact force. There is no need for test personnel to manually perform the impact operation, which can greatly reduce the labor intensity of the test personnel and avoid problems such as uneven manual impact force and position deviation, which is conducive to improving the consistency of aggregate density and test accuracy. The pressure control mechanism is combined with the setting of the pressure control mechanism. During the impact process, the pressure control mechanism applies an elastic retaining force to the circular mold through the cooperation of the U-shaped claw and the second spring, which does not affect the impact movement of the circular mold and can limit the displacement and jump of the circular mold, thereby effectively improving the reliability of the use of the device. The present invention provides a test method for aggregate crushing value test. The test method is carried out by using the above-mentioned pressure test device for aggregate crushing value test, which can effectively reduce manpower input and improve the accuracy of test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic structural diagram of the first embodiment of the pressure test device for aggregate crushing value test provided by the present invention; Figure 2 is Figure 1 Schematic structural diagram of the transfer mechanism shown; Figure 3 is Figure 2 Assembly schematic diagram of the transfer plate and the positioning storage table shown; Figure 4 is Figure 1 Schematic diagram of the positioning storage table placed on the support block shown; Figure 5 Schematic structural diagram of the second embodiment of the pressure test device for aggregate crushing value test provided by the present invention; Figure 6 is Figure 5 Partial schematic structural diagram shown; Figure 7 is Figure 5 Schematic structural diagram of the pressure control mechanism shown; Figure 8 is Figure 7 Distribution schematic diagram of the elastic claw parts shown; Figure 9 is Figure 5 Cooperating schematic diagram of the power assembly and two push components shown; Figure 10 is Figure 5 Schematic structural diagram of the push component shown; Figure 11 is Figure 5 Schematic diagram of the pressure control mechanism in the working state shown.

[0017] Reference numerals in the figure: 1, equipment platform; 2, backing plate; 3, press; 4, support block; 5, positioning stop block; 6, moving carrier plate; 7, lead screw; 8, first motor; 9, fixed column; 10, support circular plate; 11, I-shaped table; 12, first hydraulic cylinder; 13, mounting seat; 14, transfer plate; 141, front end support bar; 15, positioning storage table; 16, rack; 17, second motor; 18, gear; 19, push rod; 20, receiving block; 21, first spring; 22, rotating shaft; 23, cam; 24, third motor; 25, support frame; 26, second hydraulic cylinder; 27, lifting carrier plate; 28, slide bar; 29, U-shaped claw; 30, second spring; 31, guide rod; 32, pressure rod. Detailed implementation manners

[0018] The present invention will be further described below in conjunction with the drawings and embodiments.

[0019] First embodiment Please refer to Figures 1-4 In the first embodiment of the present invention, the pressure test device for the aggregate crushing value test includes: an equipment platform 1, a backing plate 2, and a press 3. The backing plate 2 is fixedly installed on the top of the equipment platform 1, and the press 3 is fixedly installed on the top of the backing plate 2. The press 3 is configured using the conventional design of a hydraulic press in the prior art. Three support blocks 4 are fixedly installed on the top of the backing plate 2, and the three support blocks 4 are equally spaced. An avoidance interval is formed between any two adjacent support blocks 4 for avoiding the front support bar 141 on the transfer plate 14 mentioned below. A transfer mechanism is provided on the equipment platform 1. The transfer mechanism includes a lifting component and a moving component. The lifting component is used to adjust the height position of the moving component. A positioning and placing table 15 is installed on the moving component. The moving component is used to move the positioning and placing table 15 above the three support blocks 4. A positioning groove is formed on the top of the positioning and placing table 15 for placing the test mold for the aggregate crushing value test. The diameter of the positioning groove is 0.8 - 1 cm larger than the diameter of the bottom plate of the test mold, which facilitates the placement or removal of the test mold. At the same time, after the positioning and placing table 15 is moved to the predetermined position by the transfer mechanism, the test mold will not have excessive deviation relative to the punch of the press 3.

[0020] To facilitate the test personnel to place the test mold into the positioning groove, a square opening is formed on the backing plate 2. A moving carrier plate 6 is slidably installed in the square opening. The moving component is installed on the moving carrier plate 6. A lead screw 7 is rotatably installed in the square opening. The lead screw 7 passes through the moving carrier plate 6 and is threadedly connected to the moving carrier plate 6. A first motor 8 is fixedly installed on one side of the equipment platform 1. One end of the lead screw 7 extends outside the equipment platform 1 and is fixedly connected to the output end of the first motor 8. After the first motor 8 operates, it drives the lead screw 7 to rotate. By the helical pushing action of the lead screw 7, the moving carrier plate 6 is driven to move left or right. After the moving carrier plate 6 moves to the extreme right position, the relevant test personnel can place the test mold in the positioning groove on the positioning and placing table 15 on the right side of the equipment platform 1.

[0021] In this embodiment, the lifting component specifically includes a plurality of fixed columns 9, a support circular plate 10, an I-shaped platform 11, and a first hydraulic cylinder 12. The plurality of fixed columns 9 are all fixedly installed on the bottom of the moving carrier plate 6. The support circular plate 10 is fixedly installed at the bottom ends of the plurality of fixed columns 9. The I-shaped platform 11 includes an upper disk, a lower disk, and an intermediate cylinder. The lower disk is slidably sleeved on the plurality of fixed columns 9. The intermediate cylinder passes through the moving carrier plate 6 and is slidably connected to the moving carrier plate 6. The upper disk at the top of the I-shaped platform 11 is located above the equipment platform 1. The first hydraulic cylinder 12 is fixedly installed on the top of the support circular plate 10. The output end of the first hydraulic cylinder 12 is fixedly connected to the bottom of the I-shaped platform 11. A positioning collar is fixedly sleeved on the outer wall of each fixed column 9 to limit the maximum rising distance of the I-shaped platform 11; The moving assembly specifically includes a mounting seat 13, a transfer plate 14, a rack 16, a second motor 17 and a gear 18. The mounting seat 13 is fixedly mounted on the top of the upper disc of the I-beam table 11, the transfer plate 14 penetrates and is slidably mounted on the mounting seat 13, the rack 16 is fixedly mounted on the top of the transfer plate 14, the second motor 17 is fixedly mounted on the mounting seat 13, the gear 18 is fixedly sleeved on the output end of the second motor 17, and the gear 18 is meshed with the rack 16. The end of the transfer plate 14 close to the press 3 is integrally formed with two front End support bar 141, the minimum distance between the two front end support bars 141 is greater than the width of the support block 4 located in the middle, and two limiting round rods are fixedly installed on the top of the two front end support bars 141. The positioning holding platform 15 is slidably sleeved on the four limiting round rods. The transfer plate 14 moves forward a certain distance and then is lowered. The two front end support bars 141 will respectively enter the two avoidance intervals, and then the positioning holding platform 15 will be placed on the top of the three support blocks 4. When conducting the test, the three support blocks 4 support the positioning holding platform 15.

[0022] In this embodiment, in order to position the forward position of the transfer plate 14, two positioning blocks 5 are fixedly installed on the top of the pad 2. When the two front end support bars 141 respectively collide with the two positioning blocks 5, the positioning holding platform 15 has reached the predetermined lateral position at this time, and then it can be lowered onto the three support blocks 4. Since the test mold is located in the positioning groove of the positioning holding platform 15, the lateral position of the test mold can also be accurately found (the axis center line of the test mold will not deviate too much from the axis center line of the pressure head of the press 3).

[0023] In this embodiment: When in use, the first motor 8 drives the screw rod 7 to rotate forward, which can drive the movable carrier plate 6 to move to the right, and the transfer mechanism follows the movement of the movable carrier plate 6, and finally moves to the right side of the equipment platform 1. After the relevant test personnel pour the aggregate into the round mold of the test mold and complete the knocking, they can then easily place the test mold in the positioning groove of the positioning holding table 15; After the placement of the trial mold is completed, start the first motor 8 to run, driving the lead screw 7 to rotate in the reverse direction. During the reverse rotation of the lead screw 7, it will drive the moving carrier plate 6 to move to the left, finally resetting the moving carrier plate 6. After that, start the second motor 17 to run, driving the gear 18 to rotate counterclockwise. The counterclockwise rotating gear 18 will push the rack 16 forward, causing the transfer plate 14 to continuously move forward. The transfer plate 14 drives the positioning holding table 15 and the trial mold filled with aggregates to move. When the two front support bars 141 on the transfer plate 14 respectively abut against the two positioning blocks 5, turn off the second motor 17. At this time, the horizontal position of the positioning holding table 15 is accurately found. Subsequently, retract the output end of the first hydraulic cylinder 12. The first hydraulic cylinder 12 drives the I-shaped table 11 to move downward. The I-shaped table 11 will drive the moving assembly to move downward. The two front support bars 141 will respectively enter the avoidance intervals between the corresponding two support blocks 4. As the front support bars 141 continue to descend, the positioning holding table 15 stays on the three support blocks 4. In this way, the positioning holding table 15 can be reliably supported, and at the same time its longitudinal position is also accurately found. When the position of the positioning holding table 15 is accurately found, the position of the trial mold located in the positioning groove is also accurately found accordingly. Thereafter, a specified pressure can be applied to the indenter of the trial mold through the press 3 according to the test requirements. Since the trial mold is sent into the press 3 through the transfer mechanism, it is relatively safe, and the position of the trial mold is also found relatively accurately, enabling the aggregates to be more evenly stressed.

[0024] Second Embodiment: The second embodiment of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0025] Please refer to Figures 5-11 , in the pressure test device for aggregate crushing value test provided in this embodiment, a shock mechanism for shocking the trial mold for aggregate crushing value test is further provided on the moving carrier plate 6 and the positioning holding table 15. The shock mechanism includes a power assembly and two top-pushing assemblies. The two top-pushing assemblies are both installed on the positioning holding table 15 and are respectively located on both sides of the transfer plate 14. The power assembly is installed on the moving carrier plate 6.

[0026] Specifically, the power assembly includes a rotating shaft 22, two cams 23, and a third motor 24. The rotating shaft 22 is rotatably installed on the top of the moving carrier plate 6. The two cams 23 are both fixedly sleeved on the rotating shaft 22. Two avoidance openings are provided on the moving carrier plate 6 for avoiding the two cams 23 respectively, and the phase difference between the two cams 23 is 180°. The third motor 24 is fixedly installed on the top of the moving carrier plate 6, and the output end of the third motor 24 is fixedly connected to one end of the corresponding rotating shaft 22; Any one of the pushing components includes two push rods 19, a receiving block 20 and two first springs 21. A smooth hole communicating with the positioning groove is formed at the bottom of the positioning placing table 15. The two push rods 19 are both slidably installed in the corresponding smooth holes. The receiving block 20 is fixedly installed at the bottom ends of the two push rods 19. The two first springs 21 are respectively sleeved on the two push rods 19. The top ends of the two first springs 21 are fixedly connected to the positioning placing table 15, and the bottom ends are fixedly connected to the receiving block 20. The two cams 23 respectively push the two receiving blocks 20. During the process of the protruding part of the cam 23 rotating from bottom to top, it will push the receiving block 20 to move upward. The receiving block 20 drives the two push rods 19 to slide upward. Under the push of the two push rods 19, one side of the chassis of the test mold will be jacked up. When the cam 23 is separated from the receiving block 20, under the action of gravity and the elastic force of the first spring 21, the two push rods 19 will reset downward, and the chassis of the test mold will also fall flat. The aggregate in the circular mold of the test mold is lifted and then dropped. When the particles fall, they are affected by gravity and impact the bottom of the test mold or other particles, generating an impact force, which promotes the aggregate particles to be packed more closely, thus playing a role of jolting. Since the phase difference between the two cams 23 is 180°, when one of the cams 23 is in contact with the corresponding receiving block 20, the other cam 23 is in a separated state from the corresponding receiving block 20. In this way, the left and right cyclic jolting of the aggregate in the test mold can be realized, making the aggregate in the test mold uniform and dense; In this embodiment, a pressure control mechanism is further installed on the top of the equipment platform 1. The pressure control mechanism is used to prevent the circular mold in the test mold from shifting and jumping during the jolting of the aggregate. Specifically, the pressure control mechanism includes a lifting carrier plate 27 and two groups of pressure control units, and also includes a support frame 25, a second hydraulic cylinder 26 and two guide rods 31. The support frame 25 is fixedly installed on the top of the equipment platform 1. The second hydraulic cylinder 26 is fixedly installed on the top of the support frame 25. The output end of the second hydraulic cylinder 26 extends into the support frame 25 and is fixedly connected to the lifting carrier plate 27. The two guide rods 31 both penetrate and are slidably installed on the support frame 25, and the bottom ends of the two guide rods 31 are fixedly connected to the lifting carrier plate 27. The two groups of pressure control units are respectively installed at both ends of the lifting carrier plate 27. Each group of pressure control units includes three elastic claw members distributed in a fan shape. Each elastic claw member includes a slide rod 28, a U-shaped claw 29 and a second spring 30. The slide rod 28 penetrates and is slidably installed on the lifting carrier plate 27. The U-shaped claw 29 is fixedly installed at the bottom end of the slide rod 28. The opening direction of the U-shaped claw 29 faces the circular mold, and the width of its opening is greater than the wall thickness of the circular mold. The second spring 30 is sleeved on the slide rod 28. The top end of the second spring 30 is fixedly connected to the lifting carrier plate 27, and the bottom end is fixedly connected to the U-shaped claw 29.

[0027] In order to limit the upward movement of the positioning placing table 15 during the jolting process, a pressure rod 32 is fixedly installed on the outer wall of one side of the lifting carrier plate 27. During the process of the second hydraulic cylinder 26 driving the lifting carrier plate 27 to move downward, the U-shaped claw 29 first clamps on the top of the circular mold, and then the lifting carrier plate 27 continues to descend. The U-shaped claw 29 will rise relative to the lifting carrier plate 27, and the second spring 30 will be compressed. After that, the bottom end of the pressure rod 32 abuts against the top of the positioning placing table 15.

[0028] In this embodiment: Since the jolting mechanism is provided on the moving carrier plate 6 and the positioning placing table 15, after the relevant test personnel fill the aggregate into the cylinder of the test mold, the test mold can be placed in the positioning groove on the positioning placing table 15 for jolting, so as to make the aggregate in the circular mold uniform and dense. The specific operation is as follows: Place the test mold containing the aggregate (the pressure head of the test mold is not put into the circular mold first) in the positioning groove, and then start the output end of the second hydraulic cylinder 26 in the pressure control mechanism to extend downward. The second hydraulic cylinder 26 drives the lifting carrier plate 27 to move downward. The lifting carrier plate 27 drives the two pressure control units and the pressure rod 32 on itself to move downward. The U-shaped claws 29 on the two pressure control units both clamp on the top of the circular mold. Subsequently, the lifting carrier plate 27 continues to descend a certain distance, so that the bottom end of the pressure rod 32 abuts against the top of the positioning placing table 15. In this way, the positioning placing table 15 cannot move upward due to the restriction of the pressure rod 32, and the reverse elastic force after the second spring 30 is compressed acts on the top of the circular mold through the U-shaped claw 29, restricting the circular mold; After starting the third motor 24 to operate, it will drive the two cams 23 on the rotating shaft 22 to rotate cyclically. The two cams 23 will alternately abut against the corresponding receiving blocks 20. When the receiving blocks 20 are abutted, they will rise, and the chassis of the corresponding test mold will be pushed up on one side through the two push rods 19. Since one side of the circular mold follows the chassis to rise, the corresponding U-shaped claw 29 will rise accordingly, but the elastic pressure of the second spring 30 will always give the circular mold a limiting pressure. Combining with the limiting effect of the circular groove opened on the chassis of the test mold on the circular mold, it is ensured that the circular mold will not be displaced or jump without hindering the jolting movement of the circular mold; When the cam 23 is separated from the receiving block 20, the two push rods 19 will reset downward, and the chassis of the test mold will also fall flat, generating an impact force to promote the aggregate particles to be more closely packed. Since the phase difference between the two cams 23 is 180°, the two receiving blocks 20 will be alternately abutted, so that the left and right sides of the test mold can be alternately lifted and lowered, thereby realizing the left and right cyclic jolting of the aggregate in the test mold and making the aggregate in the test mold uniform and dense.

[0029] Third Embodiment: This embodiment provides a test method for the aggregate crushing value test, including the following steps: T1: Screen the aggregates, remove the particles that do not meet the particle size requirements, and weigh a specified mass of aggregates as the test sample; T2: Place the circular mold in the test mold on the circular groove of the chassis, and then pour the weighed aggregates into the circular groove; T3: Strike the test mold left and right 25 times to compact the aggregates, and then press the punch in the test mold into the circular mold; T4: Place the test mold in the positioning groove on the positioning storage table 15, then start the transfer mechanism to run, and transfer the test mold to a predetermined position in the press 3; T5: Start the press 3, apply pressure to the punch of the test mold at a set loading rate until the maximum test load is reached, and maintain for a specified time; T6: After reaching the specified time, stop the press 3 from loading, slowly unload the pressure, and return the punch of the press to the initial position; T7: Start the transfer mechanism to run, reset the positioning storage table 15 to the initial position, and then take out the test mold; T8: Pour the crushed aggregates in the test mold into a standard sieve for screening to separate the particles that meet the specified particle size requirements; T9: Weigh the mass of the aggregates passing through the sieve, calculate the crushing value of the aggregates according to the crushing value calculation formula in the test standard, and record the test results.

[0030] The above are only embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A pressure test device for aggregate crushing value test, comprising an equipment platform, a backing plate and a press. The backing plate is fixedly installed on the top of the equipment platform, and the press is fixedly installed on the top of the backing plate. It is characterized in that, Three support blocks are fixedly installed on the top of the backing plate. A transfer mechanism is arranged on the equipment platform. The transfer mechanism includes a lifting component and a moving component. The lifting component is used to adjust the height position of the moving component. A positioning and placing table is installed on the moving component. The moving component is used to move the positioning and placing table above the three support blocks. A positioning groove is formed on the top of the positioning and placing table, and the positioning groove is used to place the test mold for the aggregate crushing value test.

2. The pressure test device for aggregate crushing value test according to claim 1, wherein, A square opening is formed in the backing plate. A moving carrier plate is slidably installed in the square opening. The moving component is installed on the moving carrier plate. A lead screw is rotatably installed in the square opening. The lead screw penetrates through the moving carrier plate and is threadedly connected to the moving carrier plate. A first motor is fixedly installed on one side of the equipment platform. One end of the lead screw extends outside the equipment platform and is fixedly connected to the output end of the first motor.

3. The pressure test device for the aggregate crushing value test according to claim 2, characterized in that, The lifting component includes a plurality of fixed columns, a support circular plate, an I-shaped platform and a first hydraulic cylinder. The plurality of fixed columns are all fixedly installed at the bottom of the moving carrier plate. The support circular plate is fixedly installed at the bottom ends of the plurality of fixed columns. The I-shaped platform is slidably sleeved on the plurality of fixed columns. The top of the I-shaped platform extends above the equipment platform. The first hydraulic cylinder is fixedly installed on the top of the support circular plate. The output end of the first hydraulic cylinder is fixedly connected to the bottom of the I-shaped platform.

4. The pressure test device for aggregate crushing value test according to claim 3, characterized in that, The moving component includes a mounting seat, a transfer plate, a rack, a second motor and a gear. The mounting seat is fixedly installed on the top of the I-shaped platform. The transfer plate penetrates through and is slidably installed on the mounting seat. The rack is fixedly installed on the top of the transfer plate. The second motor is fixedly installed on the mounting seat. The gear is fixedly sleeved on the output end of the second motor, and the gear meshes with the rack. Two front support bars are integrally formed at one end of the transfer plate close to the press. Two limiting round rods are fixedly installed on the top of each of the two front support bars. The positioning and placing table is slidably sleeved on the four limiting round rods.

5. The pressure test device for the aggregate crushing value test according to claim 3, characterized in that, Two positioning stoppers are fixedly installed on the top of the backing plate.

6. The pressure test device for the aggregate crushing value test according to claim 2, characterized in that, A jolting mechanism for jolting the test mold for the aggregate crushing value test is further arranged on the moving carrier plate and the positioning and placing table. The jolting mechanism includes a power component and two top-pushing components. The two top-pushing components are both installed on the positioning and placing table and are respectively located on both sides of the transfer plate. The power component is installed on the moving carrier plate.

7. The pressure test device for aggregate crushing value test according to claim 6, characterized in that, The power component includes a rotating shaft, two cams and a third motor. The rotating shaft is rotatably installed on the top of the moving carrier plate. The two cams are both fixedly sleeved on the rotating shaft, and the phase difference between the two cams is 180°. The third motor is fixedly installed on the top of the moving carrier plate. The output end of the third motor is fixedly connected to one end of the corresponding rotating shaft; Any one of the pushing components includes two push rods, a receiving block, and two first springs. A smooth hole communicating with the positioning groove is formed at the bottom of the positioning and placing table. The two push rods are slidably installed in the corresponding smooth holes. The receiving block is fixedly installed at the bottom ends of the two push rods. The two first springs are respectively sleeved on the two push rods. The top ends of the two first springs are fixedly connected to the positioning and placing table, and the bottom ends are fixedly connected to the receiving block.

8. The pressure test device for aggregate crushing value test according to claim 6, characterized in that, A pressure control mechanism is further installed on the top of the equipment platform. The pressure control mechanism is used to prevent the circular mold in the test mold from shifting and jumping during the impact on the aggregate. The pressure control mechanism includes a lifting carrier plate and two groups of pressure control units. The two groups of pressure control units are respectively installed at both ends of the lifting carrier plate. Each group of pressure control units includes three elastic claw members distributed in a fan shape. Each elastic claw member includes a sliding rod, a U-shaped claw, and a second spring. The sliding rod penetrates and is slidably installed on the lifting carrier plate. The U-shaped claw is fixedly installed at the bottom end of the sliding rod. The second spring is sleeved on the sliding rod. The top end of the second spring is fixedly connected to the lifting carrier plate, and the bottom end is fixedly connected to the U-shaped claw.

9. The pressure test device for aggregate crushing value test according to claim 8, characterized in that, A pressure rod is fixedly installed on the outer wall of one side of the lifting carrier plate.

10. A test method for the aggregate crushing value test, characterized in that, Using the pressure test device for aggregate crushing value test as described in any one of claims 1-9 for the test, including the following steps: T1: Screen the aggregate to remove particles that do not meet the particle size requirements, and weigh a specified mass of the aggregate as the test sample. T2: Place the circular mold in the test mold in the circular groove on the chassis, and then pour the weighed aggregate into the circular groove. T3: Strike the test mold left and right 25 times to compact the aggregate, and then press the pressure head in the test mold into the circular mold. T4: Place the test mold in the positioning groove on the positioning and placing table, and then start the transfer mechanism to operate to transfer the test mold to a predetermined position in the press. T5: Start the press, apply pressure to the pressure head of the test mold at a set loading rate until the maximum test load is reached, and maintain for a specified time. T6: After reaching the specified time, stop the press from loading, slowly unload the pressure to make the press pressure head return to the initial position. T7: Start the transfer mechanism to operate, reset the positioning and placing table to the initial position, and then take out the test mold. T8: Pour the crushed aggregate in the test mold into a standard sieve for screening to separate the particles that meet the specified particle size requirements. T9: Weigh the mass of the aggregate passing through the sieve, calculate the crushing value of the aggregate according to the crushing value calculation formula in the test standard, and record the test results.

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