A specimen forming auxiliary device for unconfined compressive strength test

Abstract

The utility model discloses a kind of specimen forming auxiliary devices for unconfined compressive strength test, belong to specimen forming auxiliary technical field.The utility model specimen forming auxiliary device, the bottom inside of test mould cylinder is inserted with the bottom pad block compatible with it, the bottom inside of test mould cylinder is opened with annular clamping slot corresponding bottom pad block, bottom pad block is opened with multiple sliding cavities corresponding annular clamping slot circumference, sliding cavity is slidably connected with the male head compatible with it, spring is equipped between the tail end of male head and the end arm of sliding cavity, the tail end of male head is equipped with the recessed cavity for spring insertion, bottom pad block protrudes test mould cylinder bottom surface, male head is inserted annular clamping slot and is compatible with annular clamping slot, the top inside of test mould cylinder is inserted with the top pad block compatible with it, bottom pad block is inserted into test mould cylinder, male head is inserted into annular clamping slot by spring drive, forms positioning limiting effect, test mould cylinder is propped up, without extra increase pad plate.

Description

Technical Field

[0001] This utility model relates to the field of specimen molding auxiliary technology, specifically a specimen molding auxiliary device for unconfined compressive strength testing. Background Technology

[0002] Unconfined compressive strength testing, also known as unconfined compressive strength testing of inorganic binder stabilized materials, is an important testing method for evaluating the mechanical properties of engineering materials such as cement-stabilized soil and lime-fly ash stabilized materials. The results directly affect the quality assessment and design parameter selection for projects such as road base courses and building foundations. During the test, the material is filled into a cylindrical mold according to standard methods, pressed using a press, then demolded, cured, and its compressive strength is tested.

[0003] In traditional specimen molding operations, a base block needs to be placed at the bottom of the mold cylinder, protruding approximately 2 cm above the bottom surface of the mold cylinder to provide stable support during pressurization. However, existing technologies have significant drawbacks: the base block has poor adaptability; conventional operations require the use of a separate pad to temporarily elevate the mold cylinder, but such pads are not standardized experimental equipment, necessitating the search for metal or rigid sheet metal of suitable dimensions. This process is cumbersome and makes it difficult to ensure a tight fit with the mold cylinder, potentially leading to uneven stress on the specimen or tilting of the mold cylinder during molding. After molding, the mold cylinder and base block need to be separated by tapping or pushing, which can easily cause chipping at the specimen edges or damage to the internal structure. Therefore, there is an urgent need for an auxiliary device that is quick to assemble and disassemble, self-locking and stable, and compatible with standardized mold cylinders to facilitate unconfined compressive strength testing. Utility Model Content

[0004] The purpose of this invention is to provide an auxiliary device for forming specimens for unconfined compressive strength testing, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: An auxiliary device for forming specimens for unconfined compressive strength testing includes a mold cylinder and a base block. The base block is inserted into the inner wall near the bottom of the mold cylinder, with its lower end extending beyond the bottom of the mold cylinder. An annular groove is provided on the inner wall near the bottom of the mold cylinder. Multiple sliding cavities are evenly distributed around the outer periphery of the base block. Each sliding cavity is fitted with a limiting mechanism. The limiting mechanism includes a convex clamping head and a spring. The convex clamping head includes a body and a head. The body of the convex clamping head is slidably connected to the sliding cavity. One end of the body protrudes from the head, and the other end of the body has a concave cavity that abuts against one end of the spring, so that the spring is restricted within the sliding cavity. The spring drives the convex clamping head to insert the head into the matching annular groove, thus confining the base block within the mold cylinder.

[0006] As a preferred embodiment of this utility model, the lower end of the bottom pad extends 2cm beyond the bottom of the test mold cylinder.

[0007] As a preferred embodiment of this utility model, it also includes a top pad block, which is inserted into the inner side wall of the top of the test mold cylinder.

[0008] As a preferred embodiment of this utility model, the opening of the sliding cavity is threaded with a limiting cover with a slot, and the limiting cover also has a clearance hole for the head of the convex clamp to pass through. The convex clamp passes through the clearance hole and exits the limiting cover.

[0009] As a preferred embodiment of this utility model, the convex chuck head has symmetrically arranged positioning guide strips on both sides of its body, and the inner wall of the sliding cavity has a positioning guide groove adapted to the insertion of the positioning guide strips. The positioning guide strips are slidably connected to the positioning guide grooves. The cooperation between the positioning guide strips and the positioning guide grooves forms a rotation limit, ensuring that the threaded through hole on the convex chuck head remains downward during installation, facilitating the screwing in of the threaded pin.

[0010] Furthermore, the convex chuck has a longitudinally threaded through hole in its body, and a threaded pin is threadedly connected to the through hole. The top end of the threaded pin does not protrude from the through hole, and the tail end of the threaded pin has a slot. The bottom pad has a groove for the threaded pin to pass through and move. The groove is located below the sliding cavity, and its radial length is the range of motion of the convex chuck driving the threaded pin. By having a slot on the threaded pin, it is easy to screw the threaded pin, and the threaded pin can move along the groove.

[0011] As a preferred embodiment of this utility model, it further includes a limiting disc. The bottom end of the base block has an annular mounting cavity adapted for the rotating installation of the limiting disc. A pressure plate is fixedly connected to the center of the bottom surface of the base block by bolts. The non-contact area of ​​the pressure plate and the center of the bottom surface of the base block presses against the limiting disc, and the limiting disc slides relative to the pressure plate. A countersunk hole for bolts to pass through is formed on the circumference of the pressure plate, and a threaded hole for bolt thread connection is formed on the center of the bottom surface of the base block.

[0012] Furthermore, a slanted groove is formed on the tail end of each actuating threaded pin on the limiting disc. The slanted groove partially overlaps with the waist groove. The tail end of the actuating threaded pin is inserted into the slanted groove. Both ends of the slanted groove are connected to arc-shaped grooves. The arc-shaped grooves are concentrically arranged with the limiting disc. An arc-shaped positioning notch for the actuating threaded pin extends from the outer side of the arc-shaped groove, and a ramp groove extends from the inner side of the arc-shaped groove relative to the arc-shaped positioning notch. The spring pushes the convex locking head outward and keeps it in the outward pushing state. Thus, when the actuating threaded pin enters the arc-shaped groove, it can abut against the arc-shaped positioning notch to form a limit. At the same time, when the convex locking head is subjected to reverse squeezing force, the ramp groove can limit the actuating threaded pin. This allows the actuating threaded pin to form a synchronous limiting effect on the limiting disc when it is locked into the end of the arc-shaped groove, preventing the limiting disc from rotating and affecting the stability of the convex locking head inserted into the annular locking groove.

[0013] Furthermore, the limiting disc is also provided with a turning groove for turning the limiting disc. The turning groove and the inclined groove are evenly distributed on the limiting disc. The turning groove allows the limiting disc to be rotated easily.

[0014] Compared with the prior art, the beneficial effects of this utility model are: 1. In this utility model, the bottom pad is inserted into the test mold cylinder, and the convex clamp head is driven by a spring to insert into the annular groove, forming a positioning and limiting effect. The bottom pad extends 2cm out of the test mold cylinder, supporting the test mold cylinder by 2cm, without the need to set an additional pad plate under the test mold cylinder.

[0015] 2. In this utility model, the convex clamp and spring are assembled in the sliding cavity through the limiting cover, the actuating threaded pin is assembled in the convex clamp, and the limiting plate is assembled in the annular mounting cavity through the pressure plate, forming an integral assembly design.

[0016] 3. This utility model uses the rotation of the limiting disc and the cooperation of the inclined groove and the waist groove to push the moving threaded pin to move, thereby driving the moving threaded pin into the arc grooves at both ends of the inclined groove to form a limiting effect, so that the convex chuck is maintained in the extended or retracted state. In the extended state, it is convenient to form a stable position after the bottom pad is inserted into the test mold cylinder. In the retracted state, it is convenient to disassemble the bottom pad. It has the advantages of quick assembly and disassembly, self-locking stability and convenient test operation. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the specimen molding auxiliary device for unconfined compressive strength testing according to this utility model; Figure 2 This is a cross-sectional view of the specimen molding auxiliary device for unconfined compressive strength testing according to this utility model; Figure 3 This is an exploded view of a portion of the structure of the specimen molding auxiliary device for unconfined compressive strength testing according to this utility model; Figure 4 This is a bottom view of the bottom pad block in the specimen molding auxiliary device for unconfined compressive strength testing according to this utility model; Figure 5 This is a diagram showing the limiting disc in the specimen molding auxiliary device for unconfined compressive strength testing according to this utility model; In the figure: 1-test mold cylinder, 2-bottom pad block, 3-annular groove, 4-sliding cavity, 5-convex clamp head, 50-body, 51-head, 6-spring, 7-top pad block, 8-limiting cover, 9-positioning guide strip, 10-positioning guide groove, 11-shifting threaded pin, 12-waist groove, 13-limiting disc; 14-annular mounting cavity; 15-pressure plate; 16-shifting groove, 17-sloping groove, 18-arc groove, 19-arc positioning notch, 20-sloping groove. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figures 1-5 In this embodiment of the present invention, the specimen molding auxiliary device for unconfined compressive strength testing includes a mold cylinder 1 and a bottom pad 2. The bottom pad 2 is inserted into the inner wall near the bottom of the mold cylinder 1, and its lower end extends out of the bottom of the mold cylinder 1. The inner wall near the bottom of the mold cylinder 1 is provided with an annular groove 3. The outer periphery of the bottom pad 2 is uniformly provided with multiple sliding cavities 4. Each sliding cavity 4 is fitted with a limiting mechanism. The limiting mechanism includes a convex head 5 and a spring 6. The convex head 5 includes a body 50 and a head 51. The body 50 of the convex head 5 is slidably connected to the sliding cavity 4. One end of the body 50 protrudes from the head 51. The other end of the body 50 is provided with a concave cavity that abuts against one end of the spring 6, so that the spring 6 is restricted in the sliding cavity 4. The spring 6 drives the convex head 5 so that the head 51 is inserted into the annular groove 3 that is adapted to it, thus limiting the bottom pad 2 in the mold cylinder 1.

[0020] In a preferred embodiment of this invention, the lower end of the bottom pad 2 extends 2cm beyond the bottom of the test mold cylinder 1. The bottom pad 2 extends 12cm beyond the test mold cylinder, supporting the test mold cylinder 1 by 2cm, eliminating the need for an additional pad plate below the test mold cylinder 1.

[0021] In a preferred embodiment of this invention, the specimen molding auxiliary device further includes a top pad 7, which is inserted into the inner wall of the top of the mold cylinder 1.

[0022] In a preferred embodiment of this invention, a limiting cover 8 with a slotted notch is threadedly connected to the opening of the sliding cavity 4. The limiting cover 8 also has a clearance hole for the head 51 of the convex clamp 5 to pass through. The outer wall of the limiting cover 8 has external threads, and the inner wall of the port of the sliding cavity 4 has internal threads. The limiting cover 8 has a slot, which allows it to be screwed. The convex clamp 55 passes through the clearance hole and extends out of the limiting cover 88. The extension length of the convex clamp 55 can be controlled by the limiting cover 88.

[0023] In a preferred embodiment of this invention, the convex chuck 5 has symmetrically arranged positioning guide strips 9 on both sides of its body 50, and the inner wall of the sliding cavity 4 has a positioning guide groove 10 adapted to the insertion of the positioning guide strips 9. The positioning guide strips 9 and the positioning guide grooves 10 are slidably connected. The cooperation between the positioning guide strips 9 and the positioning guide grooves 10 forms a rotation limit, so that the threaded through hole on the convex chuck 5 remains downward during installation, making it convenient to screw the threaded pin 11 in.

[0024] Furthermore, the body 50 of the convex chuck 5 has a threaded through hole in the longitudinal direction, and a threaded pin 11 is connected to the threaded through hole. The top end of the threaded pin 11 does not protrude from the threaded through hole, and a slot is opened at the tail end of the threaded pin 11. A waist groove 12 for the threaded pin 11 to pass through and move is opened on the bottom pad 2. The waist groove 12 is located below the sliding cavity 4, and the radial length of the waist groove 12 is the range of motion of the convex chuck 5 driving the threaded pin 11.

[0025] By creating a slot on the threaded pin 11, it is easy to screw the threaded pin 11, and the threaded pin 11 can move along the waist groove 12; by pushing the threaded pin 1111, the convex clasp 55 can be manually pulled back, thereby releasing the restriction and making it easy to remove the bottom pad 2.

[0026] In a preferred embodiment of this invention, the specimen molding auxiliary device further includes a limiting disk 13. The bottom end of the base block 2 has an annular mounting cavity 14 adapted for rotatable installation of the limiting disk 13. A pressure plate 15 is bolted to the center of the bottom surface of the base block 2. The non-contact area of ​​the pressure plate 15 and the center of the bottom surface of the base block 2 presses against the limiting disk 13, and the limiting disk 13 slides relative to the pressure plate 15. The pressure plate 15 has a countersunk hole around its circumference for bolts to pass through, and the center of the bottom surface of the base block 2 has a threaded hole for bolt thread connection.

[0027] The convex chuck 5 and spring 6 are assembled in the sliding cavity 4 through the limiting cover 8, the actuating threaded pin 11 is assembled on the convex chuck 5, and the limiting plate 13 is assembled in the mounting cavity through the pressure plate, forming an integral assembly design.

[0028] Furthermore, a slanted groove 17 is provided on the limiting disc 13 corresponding to the tail end of each actuating threaded pin 11. The slanted groove 17 partially overlaps with the waist groove 12. The tail end of the actuating threaded pin 11 is inserted into the slanted groove 17. Both ends of the slanted groove 17 are connected to arc-shaped grooves 18. The arc-shaped grooves 18 are concentrically arranged with the limiting disc 13. An arc-shaped positioning notch 19 adapted to the actuating threaded pin 11 extends from the outer side of the arc-shaped groove 18. A sloping groove 20 extends from the inner side of the arc-shaped groove 18 relative to the arc-shaped positioning notch 19. Spring 6 pushes the convex clamp 5 outward and keeps it in the outward pushing state, so that when the threaded pin 11 enters the arc groove 18, it can abut against the arc positioning notch 19 to form a limit. At the same time, when the convex clamp 5 is subjected to reverse extrusion force, the inclined groove 20 can limit the threaded pin 11, so that when the threaded pin 11 is inserted into the end of the arc groove 18, it can form a synchronous limit effect on the limiting disk 13, preventing the limiting disk 13 from rotating and affecting the stability of the convex clamp 5 inserted into the annular groove 3.

[0029] Furthermore, the limiting disk 13 is also provided with a turning groove 16 for turning the limiting disk 13. The turning groove 16 and the inclined groove 17 are evenly distributed on the limiting disk 13. The limiting disk 13 can be easily rotated through the turning groove 16.

[0030] By rotating the limiting disc 13, combined with the cooperation of the inclined groove 17 and the waist groove 12, the moving threaded pin 11 is pushed to move, thereby driving the moving threaded pin 11 into the arc grooves 18 at both ends of the inclined groove 17 to form a limiting effect, so that the convex clasp 5 is kept in the extended or retracted state. In the extended state, it is convenient to form a stable position after the bottom pad 2 is inserted into the test mold cylinder 1. In the retracted state, it is convenient to disassemble the bottom pad 2.

[0031] The working principle of this utility model is as follows: In use, the limiting disk 13 is rotated by the actuating groove 16, causing the actuating threaded pin 11 to move along the waist groove 12 and the inclined groove 17. At the same time, the actuating threaded pin 11 enters the arc-shaped groove 18 at the inner end of the inclined groove 17 until it corresponds to the arc-shaped positioning notch 19. At this time, the convex locking head 5 is ejected outward by the spring 6, so that the actuating threaded pin 11 is inserted into the arc-shaped positioning notch 19 to form a limiting effect, causing the convex locking head 5 to retract into the sliding cavity 4. At this time, the bottom pad 2 is inserted into the bottom of the test mold cylinder 1, and the limiting disk 13 is rotated in the opposite direction, causing the actuating threaded pin 11 to extend... The waist groove 12 and the inclined groove 17 move, causing the threaded pin 11 to enter the arc-shaped groove 18 at the outer end of the inclined groove 17, so that the convex clamp 5 is inserted into the annular clamp groove 3, forming a limiting effect until it corresponds to the arc-shaped positioning notch 19. At this time, the convex clamp 5 is ejected outward by the spring 6, and the threaded pin 11 is inserted into the arc-shaped positioning notch 19, forming a limiting effect, so that the convex clamp 5 is kept in the extended state. At this time, material can be filled into the test mold cylinder 1 and compacted, and then the top pad 7 is covered, and the device is further placed into the press for testing.

[0032] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An auxiliary device for forming specimens for unconfined compressive strength testing, comprising a specimen mold cylinder (1), characterized in that: It also includes a bottom pad (2), which is inserted into the inner wall near the bottom of the test mold cylinder (1), and its lower end extends out of the bottom of the test mold cylinder (1); the inner wall near the bottom of the test mold cylinder (1) is provided with an annular groove (3), and the outer periphery of the bottom pad (2) is evenly provided with multiple sliding cavities (4), each sliding cavity (4) is adapted to a limiting mechanism, the limiting mechanism includes a convex head (5) and a spring (6), the convex head (5) includes a body (50) and a head (51), the body (50) of the convex head (5) is slidably connected to the sliding cavity (4), one end of the body (50) protrudes from the head (51), and the other end of the body (50) is provided with a concave cavity that abuts against one end of the spring (6), so that the spring (6) is restricted in the sliding cavity (4), and the head is inserted into the annular groove (3) that is adapted to it.

2. The specimen molding auxiliary device for unconfined compressive strength testing according to claim 1, characterized in that: The lower end of the bottom pad (2) extends 2cm beyond the bottom of the test mold cylinder (1).

3. The specimen molding auxiliary device for unconfined compressive strength testing according to claim 1, characterized in that: It also includes a top pad (7), which is inserted into the inner wall of the top of the test mold cylinder (1).

4. The specimen molding auxiliary device for unconfined compressive strength testing according to claim 1, characterized in that: The opening of the sliding cavity (4) is threaded with a limiting cover (8) with a slotted groove. The limiting cover (8) also has a clearance hole for the head of the convex chuck (5) to pass through.

5. The specimen molding auxiliary device for unconfined compressive strength testing according to claim 1, characterized in that: The convex head (5) has symmetrical positioning guides (9) on both sides of its body. The inner wall of the sliding cavity (4) is provided with a positioning guide groove (10) adapted to the insertion of the positioning guide (9). The positioning guide (9) is slidably connected to the positioning guide groove (10).

6. The specimen molding auxiliary device for unconfined compressive strength testing according to claim 5, characterized in that: The convex chuck (5) has a threaded through hole in its body, and a threaded pin (11) is threadedly connected to the threaded through hole. The top end of the threaded pin (11) does not protrude from the threaded through hole, and a slot is formed at the tail end of the threaded pin (11). The bottom pad (2) has a waist groove (12) for the threaded pin (11) to pass through and move. The waist groove is located below the sliding cavity, and the radial length of the waist groove is the range of motion of the convex chuck driving the threaded pin.

7. The specimen molding auxiliary device for unconfined compressive strength testing according to claim 6, characterized in that: It also includes a limiting plate (13), and the bottom end of the bottom pad (2) has an annular mounting cavity (14) adapted to the rotating installation of the limiting plate (13). The bottom surface of the bottom pad (2) is fixedly connected to a pressure plate (15) by bolts. The pressure plate (15) and the non-contact area of ​​the bottom surface of the bottom pad are pressed on the limiting plate (13), and the limiting plate (13) slides relative to the pressure plate (15).

8. The specimen molding auxiliary device for unconfined compressive strength testing according to claim 7, characterized in that: A slanted groove (17) is provided on the limiting disc (13) corresponding to the tail end of each actuating threaded pin (11). The slanted groove (17) partially overlaps with the waist groove (12). The tail end of the actuating threaded pin (11) is inserted into the slanted groove (17). Both ends of the slanted groove (17) are connected to an arc-shaped groove (18). The arc-shaped groove (18) is concentrically set with the limiting disc (13). An arc-shaped positioning notch (19) for the actuating threaded pin (11) extends from the outer side of the arc-shaped groove (18). A sloping groove (20) extends from the inner side of the arc-shaped groove (18) relative to the arc-shaped positioning notch (19).

9. The specimen molding auxiliary device for unconfined compressive strength testing according to claim 8, characterized in that: The limiting disk (13) is also provided with a toggle groove (16) for toggle the limiting disk (13). The toggle groove (16) and the inclined groove (17) are evenly distributed on the limiting disk (13).

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