Saturated surface dry water absorption testing device

Abstract

The utility model discloses a saturated surface dry water absorption testing device, belongs to the technical field of saturated surface dry water absorption testing, and can solve the problems that an existing saturated surface dry water absorption test is greatly influenced by manual operation and the test accuracy is low. The device comprises a support frame; the test mold is rotationally connected to the supporting frame; the tamping rod is arranged above the test mold, and the extension line of the central shaft of the test mold penetrates through the bottom surface, close to the test mold, of the tamping rod; and the driving module is connected with the test mold and the tamping rod and is used for driving the test mold to rotate in the horizontal plane and driving the tamping rod to move in the vertical direction so as to insert and stamp the sample in the test mold. The device is used for testing the saturated surface dry water absorption rate of the gravel aggregate.

Description

Technical Field

[0001] The utility model relates to a saturated surface dry water absorption rate testing device, belonging to the technical field of saturated surface dry water absorption rate testing. Background Art

[0002] At present, according to relevant specifications, the main operating steps of the saturated surface dry water absorption test of sand are as follows: (1) Soak the sand sample in water in advance to make it reach an oversaturated state; (2) Blow the sand sample to remove excess water; (3) Test the sand sample in a mold, load the sand sample into a saturated surface dry test mold in two layers, lift the tamping rod to a height of about 1 cm from the surface of the sand sample several times, drop it vertically and tamp the sand sample, scrape the mold mouth flat, and then lift it vertically; (4) Observe the scattered shape of the sand sample to determine whether it has reached the saturated surface dry state.

[0003] Since the test operation is mainly completed by the test personnel, the experience and proficiency of the personnel will have a great impact on the test results. Especially for the key step (3), manual operation has problems such as it is difficult to ensure that the tamping rod is lifted to the set height every time, it is difficult to ensure that the tamping rod falls vertically, it is difficult to ensure that the insertion and tamping are uniform, and it is difficult to ensure that the paving height of the first layer of sand sample is just 1 / 2 of the test mold height, which in turn affects the test results and leads to low test accuracy. Therefore, an automated sand saturated surface dry moisture content test device is needed to solve the above problems. Utility Model Content

[0004] The utility model provides a saturated surface dry water absorption rate testing device, which can solve the problems that the existing saturated surface dry water absorption rate test is greatly affected by human operation and the test accuracy is low.

[0005] The utility model provides a saturated surface dry water absorption rate testing device, the device comprising:

[0006] Support frame;

[0007] A trial mold, rotatably connected to the support frame;

[0008] A tamping rod is arranged above the test mold, and an extension line of the central axis of the test mold passes through the tamping rod close to the bottom surface of the test mold;

[0009] The driving module is connected to the test mold and the tamping rod, and is used to drive the test mold to rotate in a horizontal plane and drive the tamping rod to move in a vertical direction so as to tamp the sample in the test mold.

[0010] Optionally, the driving module includes:

[0011] A driving unit, disposed in the support frame and connected to the test mold, for driving the test mold to rotate in a horizontal plane;

[0012] The transmission unit is arranged at one side of the driving unit and connected to the tamping rod, and is used for driving the tamping rod to move vertically under the drive of the driving unit so as to tamp the sample in the test mold.

[0013] Optionally, the driving unit comprises:

[0014] A horizontal bevel gear connected to the bottom of the test mold;

[0015] A vertical bevel gear is arranged in the support frame and is located below the horizontal bevel gear, and the horizontal bevel gear and the vertical bevel gear are meshed with each other;

[0016] The motor is connected to the vertical bevel gear and is used to drive the vertical bevel gear to rotate in a vertical plane, so as to drive the horizontal bevel gear to rotate in a horizontal plane.

[0017] Optionally, one side of the support frame has a hollow support rod, and the edge of the vertical bevel gear is evenly provided with a plurality of first protrusions; the transmission unit includes:

[0018] A transmission wheel, arranged on one side of the vertical bevel gear, the transmission wheel being provided with a second protrusion matched with the first protrusion;

[0019] A pull rope has one end wound around the transmission wheel and the other end passing through the support rod and connected to the top end of the tamping rod; the vertical bevel gear is used to drive the pull rope to lift or lower the tamping rod when rotating.

[0020] Optionally, an annular groove coaxial with the central axis of the transmission wheel is formed on the outer surface thereof, the second protrusion is arranged on one side of the annular groove, and the pull rope is wound in the annular groove.

[0021] Optionally, the device further comprises:

[0022] A positioning rod is connected to the support rod and sleeved on the tamping rod to limit the tamping rod to move in a vertical direction.

[0023] Optionally, the trial mold includes:

[0024] A lower mold, rotatably connected to the support frame;

[0025] The upper die is detachably connected above the lower die, and the heights of the upper die and the lower die are equal.

[0026] Optionally, the support frame comprises:

[0027] multiple vertical support columns;

[0028] A plurality of transverse support beams are respectively connected between two adjacent vertical support columns;

[0029] The table top is rotatably arranged on the top ends of a plurality of vertical support columns; the test mold is arranged on the table top; and the driving unit is connected with the table top and is used for driving the table top to rotate in a horizontal plane.

[0030] Optionally, a top end of each vertical support column is rotatably connected to a ball; the table top contacts the top end of the vertical support column through the ball.

[0031] Optionally, the trial mold is magnetically connected to the table top.

[0032] The beneficial effects that the utility model can produce include:

[0033] The utility model is provided with a driving module connecting the test mold and the tamping rod, drives the test mold to rotate horizontally, and drives the tamping rod to move up and down in the vertical direction to insert and tamp the sample in the test mold. By adjusting the rotation speed of the test mold and the insertion frequency of the tamping rod, the test operation can be made more in line with the requirements of the test specification, and the influence of human factors on the test process and results can be effectively avoided, the standardization and automation of the test can be improved, the defects of poor test reproducibility and repeatability of the existing test method can be improved, and the accuracy and reliability of the test can be guaranteed. At the same time, the utility model is simple to operate, highly flexible and low in cost, and can replace part of the manual operation in the test, which is conducive to saving manpower and material resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A schematic diagram of the structure of a saturated surface dry water absorption rate testing device provided in an embodiment of the utility model;

[0035] Figure 2 A schematic diagram of the structure of a drive unit provided in an embodiment of the utility model;

[0036] Figure 3 A schematic diagram of the structure of a transmission unit provided in an embodiment of the utility model;

[0037] Figure 4 A schematic diagram of the structure of a test mold provided by an embodiment of the utility model;

[0038] Figure 5 A schematic structural diagram of a support frame provided in an embodiment of the utility model.

[0039] Reference numerals:

[0040] 1. Support frame; 101. Vertical support column; 102. Horizontal support beam; 103. Table; 104. Ball bearing; 2. Test mold; 201. Upper mold; 202. Lower mold; 3. Tamping rod; 4. Horizontal bevel gear; 5. Vertical bevel gear; 501. First protrusion; 6. Motor; 7. Motor base; 8. Drive wheel; 801. Second protrusion; 802. Balance protrusion; 9. Pull rope; 10. Drive wheel base; 11. Support rod; 12. Fixed pulley; 13. Positioning rod. DETAILED DESCRIPTION

[0041] The present invention is described in detail below in conjunction with embodiments, but the present invention is not limited to these embodiments.

[0042] The utility model embodiment provides a saturated surface dry water absorption test device, such as Figures 1 to 5 As shown, the device comprises:

[0043] Support frame 1;

[0044] The test mold 2 is rotatably connected to the support frame 1;

[0045] The tamping rod 3 is arranged above the test mold 2, and the extension line of the central axis of the test mold 2 passes through the tamping rod 3 close to the bottom surface of the test mold 2;

[0046] The driving module is connected to both the test mold 2 and the tamping rod 3 , and is used to drive the test mold 2 to rotate in a horizontal plane, and drive the tamping rod 3 to move in a vertical direction, so as to tamp the sample in the test mold 2 .

[0047] In this embodiment, the rotation speed of the test mold 2 and the tamping frequency of the tamping rod 3 can be set according to the relevant specifications of the saturated surface dry water absorption test to drive the test mold 2 to rotate horizontally at a uniform speed, and drive the tamping rod 3 to move up and down in the vertical direction to evenly tamp the sample in the test mold 2, so that the saturated surface dry test complies with the test specifications and improves the accuracy and reliability of the test.

[0048] Specifically, the test mold 2 in this embodiment is truncated cone-shaped, and the tamping rod 3 is cylindrical, and the shapes of the test mold 2 and the tamping rod 3 meet the requirements of the test specification. At the same time, according to the requirements of the test specification, the tamping rod 3 needs to tamp the samples at the center and around the center of the test mold 2 evenly, so in this embodiment, the extension line of the central axis of the test mold 2 passes through the tamping rod 3 close to the bottom surface of the test mold 2, so that it can be ensured that the tamping rod 3 can be inserted and tamped into the samples at the center of the test mold 2 and the samples around the center of the test mold 2 during the vertical movement.

[0049] Specifically, the driving module includes:

[0050] A driving unit is disposed in the support frame 1 and connected to the test mold 2, and is used to drive the test mold 2 to rotate in a horizontal plane;

[0051] The transmission unit is arranged at one side of the driving unit and connected to the tamping rod 3 , and is used to drive the tamping rod 3 to move vertically under the drive of the driving unit so as to tamp the sample in the test mold 2 .

[0052] Specifically, Figure 2 As shown, the drive unit includes:

[0053] A horizontal bevel gear 4 is connected to the bottom of the test mold 2;

[0054] The vertical bevel gear 5 is arranged in the support frame 1 and is located below the horizontal bevel gear 4. The horizontal bevel gear 4 and the vertical bevel gear 5 are meshed with each other.

[0055] The motor 6 is connected to the vertical bevel gear 5 and is used to drive the vertical bevel gear 5 to rotate in a vertical plane, so as to drive the horizontal bevel gear 4 to rotate in a horizontal plane. In this embodiment, a motor base 7 for supporting the motor 6 is provided in the support frame 1.

[0056] Specifically, one side of the support frame 1 has a hollow support rod 11 , and the edge of the vertical bevel gear 5 is evenly provided with a plurality of first protrusions 501 .

[0057] Specifically, Figure 3 As shown, the transmission unit includes:

[0058] The transmission wheel 8 is arranged on one side of the vertical bevel gear 5, and the transmission wheel 8 is provided with a second protrusion 801 matching with the first protrusion 501;

[0059] One end of the pull rope 9 is wound around the transmission wheel 8, and the other end passes through the support rod 11 and is connected to the top of the tamping rod 3; the vertical bevel gear 5 is used to drive the pull rope 9 to lift or lower the tamping rod 3 when rotating.

[0060] Specifically, a fixed pulley 12 is provided at one end of the support rod 11 close to the tamping rod 3 , and the pull rope 9 passes through the support rod 11 and the fixed pulley 12 and is connected to the top end of the tamping rod 3 .

[0061] In this embodiment, the vertical bevel gear 5 not only drives the test mold 2 to rotate horizontally, but also drives the transmission wheel 8 to lift or lower the tamping rod 3. Every time the tamping rod 3 is lifted, the test mold 2 rotates a certain angle, thereby achieving uniform tamping.

[0062] The present embodiment does not limit the relative position of the transmission wheel 8 and the vertical bevel gear 5, and the transmission wheel 8 can be located above the vertical bevel gear 5, or below the vertical bevel gear 5, or on the left or right side of the vertical bevel gear 5. In the present embodiment, the transmission wheel 8 is located on one side of the vertical bevel gear 5, and both are arranged in the support frame 1, and the axes of the two are in the same horizontal plane. In the present embodiment, a transmission wheel base 10 for supporting the transmission wheel 8 is arranged in the support frame 1.

[0063] In this embodiment, the number of the second protrusions 801 is set to one. Since the axis of the transmission wheel 8 and the axis of the vertical bevel gear 5 are in the same horizontal plane in this embodiment, in order to cooperate with the first protrusions 501, the initial position of the second protrusions 801 is set in the horizontal plane containing the axis of the transmission wheel 8 in this embodiment. When the second protrusions 801 are in the initial position, the tamping rod 3 is in the lowering state. When the vertical bevel gear 5 rotates, the plurality of first protrusions 501 sequentially contact and separate from the second protrusions 801, so that the tamping rod 3 is periodically switched between the lifting state and the lowering state.

[0064] Specifically, when the vertical bevel gear 5 rotates, a first protrusion 501 begins to contact the second protrusion 801, and the first protrusion 501 drives the transmission wheel 8 to rotate forward at a certain angle and wraps the pull rope 9 around the transmission wheel 8, thereby lifting the tamping rod 3 to a certain height; when the first protrusion 501 separates from the second protrusion 801, the tension applied by the transmission wheel 8 to the tamping rod 3 through the pull rope 9 disappears, and the tamping rod 3 falls freely under the action of its own weight and is lowered, and the transmission wheel 8 is driven by the pull rope 9 to rotate in the opposite direction, so that the second protrusion 801 returns to its initial position. Then, the vertical bevel gear 5 continues to rotate, and the remaining first protrusions 501 contact with the second protrusion 801 in turn and then separate, so that the transmission wheel 8 swings back and forth within a certain angle, thereby driving the tamping rod 3 to periodically switch between the lifting state and the lowering state.

[0065] Since the vertical bevel gear 5 rotates at a constant speed in one direction all the time, during the process of each contact and separation between the first protrusion 501 and the second protrusion 801, the vertical bevel gear 5 can drive the test mold 2 to rotate a certain angle, so that the test mold 2 rotates once each time the tamping rod 3 is inserted, thereby evenly tamping the samples at different positions in the test mold 2.

[0066] It is worth noting that, in order to ensure that the second protrusion 801 can return to the initial position after the tamping rod 3 is lowered each time, Figure 3 As shown, in this embodiment, at least one balancing protrusion 802 is also provided on the edge of the transmission wheel 8 to balance the weight of the second protrusion 801. In this way, when the transmission wheel 8 is not subjected to force, the second protrusion 801 can be maintained at its initial position without positional deviation.

[0067] It can be seen from the above structure that the height of the tamping rod 3 is related to the size of the vertical bevel gear 5, the number of the first protrusions 501 and the arrangement position. In this embodiment, the multiple first protrusions 501 are evenly arranged on the edge of the vertical bevel gear 5. Since the vertical bevel gear 5 rotates at a constant speed, it can be ensured that the time interval of each tamping of the tamping rod 3 is equal. At the same time, the test specification stipulates three tamping times for different samples, namely, 5 times, 10 times and 13 times. Since each first protrusion 501 contacts and separates from the second protrusion 801 once, the tamping rod 3 is tamped once, so three types of vertical bevel gears 5 can be set accordingly, and the number of first protrusions 501 on the three types of vertical bevel gears 5 is 5, 10 and 13 respectively. When testing, the appropriate vertical bevel gear 5 can be selected according to the sample for test. In addition, the test specification generally requires that the height of the tamping rod 3 is 10 mm, and the size of each type of vertical bevel gear 5 and the spacing between two adjacent first protrusions 501 can be determined by calculation, so as to adjust the lifting height of the tamping rod 3 so that the test operation meets the requirements of the test specification.

[0068] It is worth noting that, no matter the number of tamping is 5, 10 or 13 times, the samples in the test mold 2 need to be tamped evenly within the corresponding number of tamping, that is, the test mold 2 needs to be rotated at least 360° so that the tamping rod 3 can tamp the samples at different positions in the test mold 2. Therefore, the rotation speed of the vertical bevel gear 5 that drives the test mold 2 to rotate can be determined by calculation according to the number of tamping.

[0069] Specifically, in order to prevent the pull rope 9 from being entangled with the second protrusion 801, this embodiment provides an annular groove coaxial with the central axis of the transmission wheel 8 on the outer surface of the transmission wheel 8, and the second protrusion 801 is arranged on one side of the annular groove, and the pull rope 9 is wound in the annular groove, thereby effectively avoiding interference between the second protrusion 801 and the pull rope 9.

[0070] Specifically, Figure 1 As shown, the device also includes:

[0071] The positioning rod 13 is connected to the support rod 11 and sleeved on the tamping rod 3 to limit the tamping rod 3 to move in the vertical direction.

[0072] By providing the positioning rod 13, a guiding effect can be provided for the tamping rod 3 during the lowering process of the tamping rod 3, so as to ensure that the tamping rod 3 falls vertically, so as to meet the requirements of the test specification for the falling angle of the tamping rod 3. Specifically, the end of the positioning rod 13 close to the tamping rod 3 is a hollow tube, and the tamping rod 3 is inserted into the hollow tube. The inner wall diameter of the hollow tube is slightly larger than the middle diameter of the tamping rod 3, and the inner wall of the hollow tube is smooth, which can reduce the friction between the tamping rod 3 and the hollow tube.

[0073] Specifically, Figure 4 As shown, trial mold 2 includes:

[0074] The upper mold 202 is rotatably connected to the support frame 1;

[0075] The upper mold 201 is detachably connected to the upper mold 202 , and the upper mold 201 and the upper mold 202 are of equal height.

[0076] Since the test specification requires that the sample should be loaded into the test mold 2 on both sides, and the height of the sample loaded into the test mold 2 for the first time should be half of the height of the test mold 2, and it is difficult to accurately control the height of the sample loaded for the first time by manual operation, the test mold 2 is divided into two layers, the upper mold 201 and the upper mold 202, and the heights of the two layers are equal. When loading the sample for the first time, it is only necessary to install the upper mold 202 in place, fill the upper mold 202 with the sample, and after tamping the sample, install the upper mold 201 on the upper mold 202, and continue the test after filling the upper mold 201 with the sample, so as to ensure that the height of the sample loaded for the first time meets the test specification.

[0077] Specifically, Figure 5 As shown, the support frame 1 includes:

[0078] A plurality of vertical support columns 101;

[0079] A plurality of transverse support beams 102 are respectively connected between two adjacent vertical support columns 101;

[0080] The table 103 is rotatably disposed on the top of a plurality of vertical support columns 101; the test mold 2 is disposed on the table 103; and the driving unit is connected to the table 103 to drive the table 103 to rotate in a horizontal plane.

[0081] Specifically, a top end of each vertical support column 101 is rotatably connected to a ball 104 ; the tabletop 103 contacts the top end of the vertical support column 101 through the ball 104 .

[0082] By providing the ball bearings 104 , the friction between the table top 103 and the support column can be reduced when the table top 103 rotates, so that the table top 103 can rotate more smoothly.

[0083] Specifically, the trial mold 2 is magnetically connected to the table 103. In this embodiment, the table 103 has magnetic force after being powered on, and can attract the upper mold 202 and the upper mold 201, so that the upper mold 202 and the upper mold 201 can rotate synchronously with the table 103.

[0084] The above are only a few embodiments of the present application and do not constitute any form of limitation to the present application. Although the present application is disclosed as above with preferred embodiments, it is not intended to limit the present application. Any technician familiar with the profession, without departing from the scope of the technical solution of the present application, using the technical content disclosed above to make slight changes or modifications are equivalent to equivalent implementation cases and fall within the scope of the technical solution.

Claims

1. A saturated surface dry water absorption test device, characterized in that: The device comprises: Support frame; A trial mold, rotatably connected to the support frame; A tamping rod is arranged above the test mold, and an extension line of the central axis of the test mold passes through the tamping rod close to the bottom surface of the test mold; The driving module is connected to the test mold and the tamping rod, and is used to drive the test mold to rotate in a horizontal plane and drive the tamping rod to move in a vertical direction so as to tamp the sample in the test mold.

2. The device according to claim 1, characterized in that The driving module comprises: A driving unit, disposed in the support frame and connected to the test mold, for driving the test mold to rotate in a horizontal plane; The transmission unit is arranged at one side of the driving unit and connected to the tamping rod, and is used for driving the tamping rod to move vertically under the drive of the driving unit so as to tamp the sample in the test mold.

3. The device according to claim 2, characterized in that The driving unit comprises: A horizontal bevel gear connected to the bottom of the test mold; A vertical bevel gear is arranged in the support frame and is located below the horizontal bevel gear, and the horizontal bevel gear and the vertical bevel gear are meshed with each other; The motor is connected to the vertical bevel gear and is used to drive the vertical bevel gear to rotate in a vertical plane, so as to drive the horizontal bevel gear to rotate in a horizontal plane.

4. The device according to claim 3, characterized in that One side of the support frame has a hollow support rod, and the edge of the vertical bevel gear is evenly provided with a plurality of first protrusions; the transmission unit includes: A transmission wheel, arranged on one side of the vertical bevel gear, the transmission wheel being provided with a second protrusion matched with the first protrusion; A pull rope has one end wound around the transmission wheel and the other end passing through the support rod and connected to the top end of the tamping rod; the vertical bevel gear is used to drive the pull rope to lift or lower the tamping rod when rotating.

5. The device according to claim 4, characterized in that An annular groove coaxial with the central axis of the transmission wheel is provided on the outer surface of the transmission wheel, the second protrusion is arranged on one side of the annular groove, and the pull rope is wound in the annular groove.

6. The device according to claim 4, characterized in that The device also includes: A positioning rod is connected to the support rod and sleeved on the tamping rod to limit the tamping rod to move in a vertical direction.

7. The device according to claim 1, characterized in that The trial mold comprises: A lower mold, rotatably connected to the support frame; The upper die is detachably connected above the lower die, and the heights of the upper die and the lower die are equal.

8. The device according to claim 2, characterized in that The support frame comprises: multiple vertical support columns; A plurality of transverse support beams are respectively connected between two adjacent vertical support columns; The table top is rotatably arranged on the top ends of a plurality of vertical support columns; the test mold is arranged on the table top; and the driving unit is connected with the table top and is used for driving the table top to rotate in a horizontal plane.

9. The device according to claim 8, characterized in that The top end of each vertical support column is rotatably connected to a ball; the table top contacts the top end of the vertical support column through the ball.

10. The device according to claim 8, characterized in that The test mold is magnetically connected to the table.

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