Test piece height measuring device additionally arranged on Marshall electric compaction test apparatus

Abstract

The utility model provides a test piece height measuring device additionally arranged on a Marshall electric compaction apparatus, which comprises a casing, a transmission case arranged at the upper part of one side surface of the casing, a hammer rod inserted in a vertical hole arranged at the top of the transmission case, a hammer head arranged at the lower end of the hammer rod, and a pedestal arranged right below the transmission case and connected with the casing, a mold container matched with the hammer head and used for storing an asphalt mixture sample is clamped on the upper surface of the pedestal, a boss is installed on one side face in the transmission case, a photoelectric range finder is installed on one face of the boss through a fastener formed by a screw and a nut, a rubber shock pad is arranged between the photoelectric range finder and the boss, and a support is installed on the lower surface of the boss; an air cylinder is installed on the upper surface of the horizontal portion of the support, and a rubber air bag located under the electro-optical range finder is installed at the movable end of the air cylinder. The device has the advantages that the electro-optical range finder in slight shaking is made to be in a static state rapidly, and waiting time is shortened.

Description

TECHNICAL FIELD

[0001] The utility model relates to a test piece height measuring device installed on a Marshall electric rammer, and belongs to the field of Marshall electric rammer. BACKGROUND

[0002] The Marshall electric rammer is an experimental equipment used in the fields of civil engineering and road construction, and is mainly used for measuring the physical and mechanical properties of asphalt mixture. It helps engineers evaluate the density, strength and other characteristics of asphalt mixture under different proportions after being pressed, so as to provide a scientific basis for design and construction. At present, in order to quickly measure the thickness of the asphalt mixture test piece treated by the Marshall electric rammer, an optical range finder is usually installed in the Marshall electric rammer. During the working process of the Marshall electric rammer, the working of the hammer head will produce vibration, which will cause the optical range finder installed in the Marshall electric rammer and matched with the hammer head to shake. In order to improve the accuracy of measurement, a period of time is needed to wait for the optical range finder to be in a stationary state, which affects the work efficiency due to the long waiting time. CONTENT OF THE UTILITY MODEL

[0003] In view of the deficiencies in the prior art, the utility model aims to provide a test piece height measuring device installed on a Marshall electric rammer to solve the problems raised in the background art. The utility model makes the optical range finder in slight shaking quickly in a stationary state, and shortens the waiting time.

[0004] In order to achieve the above-mentioned purpose, the utility model is implemented by the following technical scheme: a test piece height measuring device installed on a Marshall electric rammer, comprising a machine shell, a transmission box is installed on the upper position of one side surface of the machine shell, a vertical hole is formed in the top of the transmission box, a hammer rod is inserted into the vertical hole, a hammer head is installed at the lower end of the hammer rod, a pedestal connected with the machine shell is arranged below the transmission box, a mold container for storing asphalt mixture samples matched with the hammer head is clamped on the upper surface of the pedestal, a boss is installed on one side surface in the transmission box, an optical range finder is installed on one side of the boss by forming a fastener with a screw and a nut, a rubber shock pad is arranged between the optical range finder and the boss, a support is installed on the lower surface of the boss, the support is of L-shaped structure, a gas cylinder is installed on the upper surface of the horizontal part of the support, and a rubber air bag is arranged below the optical range finder and connected with the movable end of the gas cylinder.

[0005] Further, two connecting ears are installed on one end of the optical range finder close to the boss, the connecting ears are of L-shaped structure, the ends of the connecting ears away from the optical range finder are in contact with the rubber shock pad, the head of the screw is inserted into the boss, and the rod of the screw is threadedly connected with the nut after penetrating the rubber shock pad and the connecting ears in sequence.

[0006] Furthermore, the boss has two parallel side surfaces each having a limiting groove for limiting the position of the screw head. The side of the boss facing the rubber damping pad has two notches communicating with the limiting grooves. The head of the screw is inserted into the limiting groove, and the shank of the screw passes through the notch.

[0007] Furthermore, the rubber shock-absorbing pad has two first small holes on one side, and the connecting ear has a second small hole that matches the first small hole at the part that fits into the rubber shock-absorbing pad. The second small hole has a lug seat on the side opposite to the first small hole for limiting the position of the nut. One end of the lug seat is connected to the connecting ear, and the lug seat has a third small hole that is aligned with the second small hole on one side. There is a gap between the second small hole and the third small hole for inserting a hacksaw blade. The shank of the screw passes through the first small hole, the second small hole, and the third small hole in sequence, and the nut is located on the side of the third small hole opposite to the second small hole.

[0008] Furthermore, the side of the transmission box facing away from the housing is open, and a door is hinged to the open end of the transmission box.

[0009] Furthermore, the bottom of the transmission box has an opening, the width of which is greater than the diameter of the hammer head.

[0010] Furthermore, a motor is installed inside the housing, and two sprockets are rotatably installed inside the transmission box. The two sprockets are connected by a chain, and one sprocket is connected to the output shaft of the motor. A paddle is installed on the chain, and a protrusion that cooperates with the paddle is installed on the outer surface of the hammer rod.

[0011] Furthermore, a base is installed at the bottom of the pedestal, and foot holes are provided at the four corners of the upper surface of the base.

[0012] The beneficial effects of this utility model are:

[0013] 1. Given the distance L from the probe of the photoelectric rangefinder to the base, the height L1 of the mold container, the thickness L2 of the hammer head, and the distance L3 from the probe of the rangefinder to the hammer head after the test, the specimen height H = L - L1 - L2 - L3. The specimen height H after processing with the Marshall electric compactor is compared with the specified value of 63.5 ± 1.3 mm. The weight of the mixture when the specimen height is 63.5 mm is calculated using interpolation and used for the next specimen preparation. Before and after the Marshall test compaction, as the compaction work increases, the density of the mixture in the mold container continuously increases, and the volume decreases accordingly. A settlement difference will occur at the hammer head position, thus determining the height of the specimen after compaction. This calculation provides a basis for weighing the next specimen.

[0014] 2. Install rubber shock-absorbing pads between the boss and the photoelectric distance meter to reduce vibration and decrease the shaking amplitude of the photoelectric distance meter.

[0015] 3, the head of the screw is clamped in the limiting groove, then the rod of the screw is sequentially penetrated through the first small hole, the second small hole and the third small hole, and then the nut is screwed, the assembly of the photoelectric range finder and the boss is completed, when the screw and the nut cannot be normally separated, the rod of the screw is sawed off by using the gap between the second small hole and the third small hole, then the screw head remaining in the limiting groove is taken out, and the photoelectric range finder is disassembled without damaging other components.

[0016] 4, after the marshall test compaction, the photoelectric range finder will shake due to the action of the hammer head, the control cylinder is elongated, then the cylinder drives the rubber air bag to move, the rubber air bag is attached to the photoelectric range finder, the photoelectric range finder in the shaking state is quickly stationary, the waiting time is shortened, and the working efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] Other features, objects and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments, read in conjunction with the accompanying drawings:

[0018] Figure 1 It is a structural schematic view of the test piece height measuring device of the present application which is additionally installed on the Marshall electric compaction instrument;

[0019] Figure 2 It is an assembly schematic view of the rubber air bag, the cylinder, the boss and the photoelectric range finder in the test piece height measuring device of the present application which is additionally installed on the Marshall electric compaction instrument;

[0020] Figure 3 It is an assembly schematic view of the rubber air bag, the cylinder and the boss in the test piece height measuring device of the present application which is additionally installed on the Marshall electric compaction instrument;

[0021] Figure 4 It is an assembly schematic view of the rubber shock pad and the photoelectric range finder in the test piece height measuring device of the present application which is additionally installed on the Marshall electric compaction instrument;

[0022] In the drawing: 1- machine shell, 2- transmission box, 3- mold container, 4- pedestal, 5- base, 6- hammer head, 7- box door, 8- hammer rod, 9- boss, 10- rubber shock pad, 11- photoelectric range finder, 12- rubber air bag, 13- cylinder, 14- nut, 15- ear seat, 16- screw, 17- limiting groove, 18- connecting ear, 19- notch, 20- first small hole, 21- second small hole, 22- third small hole. DETAILED DESCRIPTION

[0023] In order to make the technical means, creative features, purposes and effects of the present application easy to understand, the present application is further described below in conjunction with specific embodiments.

[0024] Please refer to Figure 1 , the utility model provides a technical scheme: a kind of test piece height measuring device installed on Marshall electric dynamic compactor, including casing 1, transmission case 2 is installed on the upper position of one side surface of casing 1, the side of transmission case 2 away from casing 1 is open, wherein transmission case 2 opening end is hinged with box door 7, hammer rod 8 is inserted in the vertical hole opened in the top of transmission case 2, hammer head 6 is installed in the lower end of hammer rod 8, the width of through hole is greater than the diameter of hammer head 6, pedestal 4 connected with casing 1 is equipped below transmission case 2, mold container 3 for storing asphalt mixture sample is clamped on the upper surface of pedestal 4 and cooperated with hammer head 6, base 5 is installed in the bottom of pedestal 4, footing hole is formed in the upper surface of four corners of base 5, through hole is opened in the bottom of transmission case 2, motor is installed in casing 1, two sprockets are rotatably installed in transmission case 2, two sprockets are connected by chain, one sprocket is connected with the output shaft of motor, push piece is installed on chain, convex part matched with push piece is installed on the outer surface of hammer rod 8, when motor works, chain is driven to rotate by two sprockets, chain drives push piece to move, so that push piece and convex part are matched with each other, and hammer rod 8 moves upward, when push piece and convex part are separated, hammer head 6 falls into mold container 3 under the action of its own gravity, the above working principle has been fully disclosed in prior art, so it will not be further described.

[0025] Please refer to Figure 1 And Figure 2 , boss 9 is installed on one side surface in transmission case 2, light distance measuring instrument 11 is installed on one side of boss 9 by forming fastener with screw 17 and nut 15, the distance L of the probe of known light distance measuring instrument 11 to pedestal 4, the height L1 of mold container 3, the thickness L2 of hammer head 6 and the distance L3 of distance measuring instrument probe from hammer head 6 after test are known, then test piece height H=L-L1-L2-L3, by comparing test piece height H after being processed by Marshall electric dynamic compactor with the specified value of 63.5±1.3mm, the weight of mixture when test piece height is 63.5mm is calculated by interpolation method, for the next test piece, before and after marshall test compaction, with the increase of compaction work, the density of mixture in mold container 3 will increase continuously, and the volume will decrease, and the position of hammer head 6 will produce settlement difference, so that the height of test piece after compaction is obtained, and the height is calculated to provide basis for weighing the next test piece.

[0026] Please refer to Figure 2 And Figure 4, the photoelectric range finder 11 and the boss 9 are provided with a rubber shock pad 10, wherein the photoelectric range finder 11 is provided with two connecting ears 19 at the end close to the boss 9, the connecting ears 19 are L-shaped structures, the end of the connecting ear 19 away from the photoelectric range finder 11 is attached to the rubber shock pad 10, the head of the screw 17 is inserted into the boss 9, the rod of the screw 17 is screwed with the nut 15 in sequence after penetrating the rubber shock pad 10 and the connecting ear 19, the rubber shock pad 10 is installed between the boss 9 and the photoelectric range finder 11, which plays a role of shock absorption and reduces the shaking range of the photoelectric range finder 11.

[0027] Referring to Figures 2-4 , the boss 9 is provided with a limiting slot 18 on each of the two parallel sides for limiting the position of the head of the screw 17, the boss 9 is provided with two notches 20 on the side facing the rubber shock pad 10, the head of the screw 17 is inserted into the limiting slot 18, the rod of the screw 17 penetrates the notches 20, the rubber shock pad 10 is provided with two first small holes 21 on one side, the part of the connecting ear 19 attached to the rubber shock pad 10 is provided with a second small hole 22 matched with the first small hole 21, the side of the second small hole 22 away from the first small hole 21 is provided with an ear seat 16 for limiting the position of the nut 15, one end of the ear seat 16 is connected to the connecting ear 19, one side of the ear seat 16 is provided with a third small hole 23 aligned with the second small hole 22, there is a gap between the second small hole 22 and the third small hole 23 for inserting a steel saw blade, the head of the screw 17 is clamped in the limiting slot 18, then the rod of the screw 17 penetrates the first small hole 21, the second small hole 22 and the third small hole 23 in sequence, and the nut 15 is screwed on, at this time, the nut 15 is on the side of the third small hole 23 away from the second small hole 22, the assembly of the photoelectric range finder 11 and the boss 9 is completed, when the screw 17 and the nut 15 cannot be normally disassembled, the rod of the screw 17 can be cut off by using the gap between the second small hole 22 and the third small hole 23, then the head of the screw 17 remaining in the limiting slot 18 is taken out, so that the photoelectric range finder 11 can be disassembled without damaging other components.

[0028] Referring to Figure 2 and Figure 3 , the boss 9 is provided with a support 14 on the lower surface, the support 14 is an L-shaped structure, the horizontal part of the support 14 is provided with an air cylinder 13 on the upper surface, the movable end of the air cylinder 13 is provided with a rubber air bag 12 directly below the photoelectric range finder 11, after the Marshall test compaction, the photoelectric range finder 11 will shake due to the action of the hammer head 6, the air cylinder 13 is controlled to elongate, and then the air cylinder 13 drives the rubber air bag 12 to move, so that the rubber air bag 12 is attached to the photoelectric range finder 11, the photoelectric range finder 11 in the shaking state is quickly stationary, the waiting time is shortened, and the work efficiency is improved.

[0029] Although the present specification is described in terms of embodiments, not every embodiment exhibits every characteristic or implements every combination of features described in the present specification. In addition, not every embodiment includes every embodiment described in the present specification. The description herein of any embodiment, including any preferred embodiment, is thus intended to be illustrative, and not restrictive. The scope of the present application is thus intended to be broad, and will be set forth in the following claims.

Claims

1. A test piece height measuring device for a Marshall electric compactor, comprising a housing (1), characterized in that: The transmission box (2) is provided with a vertical hole in the top, a hammer rod (8) is inserted into the vertical hole, a hammer head (6) is installed at the lower end of the hammer rod (8), a pedestal (4) connected with the cabinet (1) is arranged below the transmission box (2), a mold container (3) for storing asphalt mixture sample is clamped on the upper surface of the pedestal (4) and matched with the hammer head (6), a boss (9) is installed on one side of the transmission box (2), an optical distance measuring instrument (11) is installed on one side of the boss (9) by a fastener formed by a screw (17) and a nut (15), a rubber shock pad (10) is arranged between the optical distance measuring instrument (11) and the boss (9), a support (14) is installed on the lower surface of the boss (9), the support (14) is of L-shaped structure, a gas cylinder (13) is installed on the upper surface of the horizontal part of the support (14), and a rubber air bag (12) is arranged below the optical distance measuring instrument (11) and connected with the movable end of the gas cylinder (13).

2. The test specimen height measuring device for a Marshall Electric Compactor according to claim 1, wherein: Two connecting ears (19) are installed on one end of the optical distance measuring instrument (11) close to the boss (9), the connecting ears (19) are of L-shaped structure, one end of the connecting ears (19) away from the optical distance measuring instrument (11) is attached to the rubber shock pad (10), the head of the screw (17) is inserted into the boss (9), and the rod of the screw (17) is threadedly connected with the nut (15) after penetrating the rubber shock pad (10) and the connecting ears (19) in sequence.

3. A test specimen height measuring device for retrofitting to a Marshall Electric Compactor according to claim 2, wherein: Limiting grooves (18) for limiting the position of the head of the screw (17) are formed on two parallel sides of the boss (9), two notches (20) passing through the limiting grooves (18) are formed on one side of the boss (9) facing the rubber shock pad (10), the head of the screw (17) is inserted into the limiting grooves (18), and the rod of the screw (17) penetrates the notches (20).

4. The test specimen height measuring device for a Marshall Electric Compactor according to claim 3, wherein: Two first small holes (21) are formed on one side of the rubber shock pad (10), second small holes (22) matched with the first small holes (21) are formed at the positions where the connecting ears (19) are attached to the rubber shock pad (10), an ear seat (16) for limiting the position of the nut (15) is arranged on one side of the second small holes (22) away from the first small holes (21), one end of the ear seat (16) is connected with the connecting ears (19), a third small hole (23) aligned with the second small hole (22) is formed on one side of the ear seat (16), a gap for inserting a steel saw blade is formed between the second small hole (22) and the third small hole (23), the rod of the screw (17) penetrates the first small hole (21), the second small hole (22) and the third small hole (23) in sequence, and the nut (15) is arranged on one side of the third small hole (23) away from the second small hole (22).

5. The height measuring device for Marshall Electric Compactor according to claim 1, wherein: One side of the transmission box (2) away from the cabinet (1) is open, and a box door (7) is hinged to the open end of the transmission box (2).

6. The test specimen height measuring device for retrofitting to a Marshall Electric Compactor according to claim 1, wherein: A through hole is formed in the bottom of the transmission box (2), and the width of the through hole is greater than the diameter of the hammer head (6).

7. The height measuring device for Marshall Electric Compactor according to claim 1, characterized in that: The motor is installed in the casing (1), two sprocket wheels are rotatably installed in the transmission box (2), the two sprocket wheels are connected through a chain, one sprocket wheel is connected with the output shaft of the motor, the chain is provided with a push piece, and the outer surface of the hammer rod (8) is provided with a protruding part matched with the push piece.

8. The test specimen height measuring device for retrofitting to a Marshall Electric Compactor according to claim 1, wherein: The pedestal (4) is provided with a base (5) at the bottom, and foot holes are formed at the four corners of the upper surface of the base (5).

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