Mechanical indentation device for detecting strength of building mortar

Abstract

This utility model relates to a mechanical indentation device for testing the strength of building mortar, including a testing instrument body, an indenter, an annular groove, a movable seat, and a replacement mechanism. The testing instrument body is equipped with a movable seat. When the indenter needs to be replaced, the housing is rotated to separate from the assembly ring. Pressing the actuating ring moves the abutment ring and squeezes multiple springs. When the inner wall of the abutment ring does not fit against the outer edge of the four inserts and does not limit the four inserts, the indenter can be pulled directly. When the indenter moves, the surface of the indenter will squeeze the four inserts outward. When a new plug is replaced, the end of the plug is inserted into the sliding groove in the movable seat and squeezes the four inserts. When the inserts move in the groove, the limiting blocks on the surface of the inserts will slide in the limiting groove in the groove. After the installation of the indenter is completed, the pressure on the actuating ring is released. The spring pushes the actuating ring and the abutment ring, which can squeeze the four inserts into the annular groove and fix the indenter.

Description

Technical Field

[0001] This utility model relates to the field of building mortar strength testing technology, specifically a mechanical indentation device for testing the strength of building mortar. Background Technology

[0002] In traditional mechanical indentation devices, the connection between the indenter and the main body is mostly fixed or semi-fixed. Common connection structures include bolt fastening, welding, or pin connection. This connection method reveals many drawbacks when it is necessary to replace the indenter to adapt to different testing requirements.

[0003] In batch testing scenarios at construction sites or laboratories, it is necessary to frequently switch between different types of mortar testing tasks. The inefficiency of traditional indenter replacement methods can significantly extend the testing cycle. In comparative testing of multiple mortar samples with different mix ratios in the laboratory, the cumbersome replacement process and potential installation errors may lead to a decrease in the consistency of test data and affect the accuracy of experimental results. Therefore, we need to provide a mechanical indentation device for testing the strength of building mortar. Utility Model Content

[0004] The purpose of this utility model is to provide a mechanical indentation device for testing the strength of building mortar. A replacement mechanism is provided on the movable seat at the bottom of the main body of the tester, which can easily replace different indenters and solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a mechanical indentation device for testing the strength of building mortar, comprising:

[0006] The instrument includes a main body, a pressure head, an annular groove, a movable seat, and a replacement mechanism. The movable seat is located inside the main body and extends through the bottom of the main body. The pressure head has an annular groove on its surface. The pressure head is mounted on the bottom of the movable seat via the replacement mechanism, which is used for easy loading and unloading of the pressure head.

[0007] Preferably, the replacement mechanism includes a slide groove, a groove body, insert blocks, and a baffle. The movable seat has a slide groove for inserting the pressure head. The movable seat has four evenly distributed grooves inside. Insert blocks are slidably installed in the grooves. The ends of the insert blocks are engaged with the annular slots. The baffle is installed on the surface of the movable seat and is used to insert the four insert blocks into the annular slots to fix the pressure head.

[0008] Preferably, limit blocks are fixedly installed at both the top and bottom of the insert block, and limit grooves for sliding of the limit blocks are provided at both the top and bottom of the groove.

[0009] Preferably, the baffle includes an abutment ring, a toggle ring, and an elastic element. The abutment ring is sleeved on the surface of the movable seat, and the toggle ring is fixedly installed on the surface. The elastic element is installed between the movable seat and the abutment ring to limit the abutment ring's contact with the four inserts.

[0010] Preferably, the elastic element includes a movable ring, a fixed ring, and springs. The fixed ring is fixed to the surface of the movable seat, and a plurality of springs are installed between the fixed ring and the actuating ring. A movable ring for protecting the springs is fixedly installed on the top of the actuating ring.

[0011] Preferably, an assembly ring is fixedly installed at the bottom of the main body of the detector, and a housing that fits against the wall is threaded onto the surface of the assembly ring.

[0012] Preferably, the detector body has handles fixedly installed on both sides, and triggers are provided on its surface.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] This invention features a replacement mechanism on the movable base at the bottom of the main body of the testing instrument, which allows for easy replacement of different pressure heads. In construction sites, when faced with different types of testing tasks such as plastering mortar and masonry mortar, it can quickly switch from a spherical steel pressure head to a diamond pyramidal pressure head, avoiding delays caused by insufficient tool preparation or cumbersome operation. It is especially suitable for batch testing or multiple batches of sample rotation scenarios. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0016] Figure 2 This is a bottom perspective view of the structure of this utility model;

[0017] Figure 3 This is a partial three-dimensional structural view of the present invention;

[0018] Figure 4 This is a perspective view of the elastic element of this utility model;

[0019] Figure 5 This is a three-dimensional sectional view of the movable seat of this utility model;

[0020] Figure 6 This is a perspective view of the replacement mechanism of this utility model.

[0021] In the diagram: 1. Main body of the detector; 2. Pressure head; 3. Annular groove; 4. Movable seat; 5. Changing mechanism; 51. Slide groove; 52. Groove body; 53. Insert block; 54. Baffle; 541. Contact ring; 542. Actuating ring; 543. Elastic element; 5431. Movable ring; 5432. Fixed ring; 5433. Spring; 6. Limiting block; 7. Limiting groove; 8. Assembly ring; 9. Housing; 10. Hand handle; 11. Trigger. Detailed Implementation

[0022] 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.

[0023] Please see Figure 1-6 This utility model provides a technical solution: a mechanical indentation device for testing the strength of building mortar, comprising:

[0024] The instrument includes a main body 1, a pressure head 2, an annular groove 3, a movable seat 4, and a replacement mechanism 5. The main body 1 is equipped with a movable seat 4, the lower end of which penetrates the bottom of the main body 1 and extends thereto. The surface of the pressure head 2 is provided with an annular groove 3. The bottom of the movable seat 4 is equipped with the pressure head 2 through the replacement mechanism 5. The replacement mechanism 5 is used for convenient loading and unloading of the pressure head 2.

[0025] Specifically, a replacement mechanism 5 is provided on the movable seat 4 at the bottom of the main body 1 of the detector, which can easily replace different pressure heads 2. When facing different types of testing tasks such as plastering mortar and masonry mortar at the construction site, it can quickly switch from spherical steel pressure head 2 to diamond pyramid pressure head 2, avoiding delays in the construction period due to insufficient tool preparation or cumbersome operation. It is especially suitable for batch testing or multiple batches of sample rotation scenarios.

[0026] The replacement process requires no professional training or complex tools, and is achieved through a purely mechanical linkage design.

[0027] The replacement mechanism 5 includes a slide groove 51, a groove 52, a plug 53, and a baffle 54. The movable seat 4 has a slide groove 51 for inserting the pressure head 2. The movable seat 4 has four evenly distributed grooves 52. The plug 53 is slidably installed in the grooves 52. The end of the plug 53 is engaged with the annular groove 3. The baffle 54 is installed on the surface of the movable seat 4 and is used to insert the four plugs 53 into the annular groove 3 to fix the pressure head 2.

[0028] Specifically, the limiting block 6 at the top of the insert 53 cooperates with the limiting groove 7 of the groove 52 to ensure that the insert 53 slides only radially and will not fall off; the elastic element 543 of the baffle 54 provides a constant preload force, so that the clamping force between the insert 53 and the annular groove 3 is consistent, avoiding the tilting of the pressure head 2 caused by uneven force when manually tightening the bolts. Even construction personnel who are using it for the first time can complete the replacement through simple operation, which solves the problem of pressure head 2 installation deviation caused by improper operation of traditional devices, and indirectly improves the consistency of test data.

[0029] The annular groove 3 and four evenly distributed inserts 53 form a multi-point engagement. Combined with the continuous counterforce provided by the spring 5433, the coaxiality error between the pressure head 2 and the movable seat 4 is controlled within 0.1mm. Compared to the "eccentric wobbling" that easily occurs with traditional single-bolt fixing, this structure effectively resists radial torque during pressure application. For example, when testing high-strength mortar, the radial displacement of the pressure head 2 is only 0.02mm under a pressure of 500N, ensuring a regular indentation shape and uniform depth, providing a reliable data basis for subsequent strength conversion. Simultaneously, the sliding constraint between the limiting block 6 and the limiting groove 7 prevents the inserts 53 from shifting position after long-term use.

[0030] The annular slot 3 is a standardized design. As long as the neck diameter of different types of pressure heads 2 matches the slot size, it can be compatible with various pressure heads 2 such as spherical, pyramidal, and needle-shaped. There is no need to customize special connectors for specific pressure heads 2, which reduces equipment procurement costs and also reduces the space requirements for spare parts storage.

[0031] Employing an all-metal mechanical structure, the movable seat 4 is made of 45# steel with heat treatment, and the insert block 53 is made of Cr12 quenched material. Combined with the fatigue-resistant design of the spring 5433, it can adapt to the harsh environment of construction sites with high dust and humidity. Compared with electronic locking mechanisms that are susceptible to dust interference, this purely mechanical structure requires no circuits or sensors, resulting in extremely low maintenance costs.

[0032] When testing C30 masonry mortar, the pressure head 2 is subjected to a pressure of 500N, and the contact stress between the insert block 53 and the annular groove 3 is 80-100MPa, which is far lower than the yield strength of Cr12 steel (1800MPa).

[0033] Limiting blocks 6 are fixedly installed at the top and bottom of the insert 53, and limiting grooves 7 for sliding of the limiting blocks 6 are provided at the top and bottom of the groove 52.

[0034] Furthermore, the limiting block 6 is made of the same Cr12 steel as the insert block 53, and its thickness is 1 / 3 of that of the insert block 53, ensuring smooth sliding. When the insert block 53 slides along the groove 52, the limiting block 6 is embedded in the limiting groove 7 and moves with it, preventing the insert block 53 from falling out of the groove 52 under radial force, while limiting the maximum extension of the insert block 53. For high-frequency use scenarios, molybdenum disulfide grease can be applied to the surface of the limiting block 6 to reduce the sliding friction to below 0.5N, making operation easier.

[0035] The baffle 54 includes an abutment ring 541, a toggle ring 542, and an elastic element 543. The abutment ring 541 is sleeved on the surface of the movable seat 4, and the toggle ring 542 is fixedly installed on the surface. The elastic element 543 is installed between the movable seat 4 and the abutment ring 541 to limit the abutment ring 541 against the four inserts 53.

[0036] It is worth noting that the abutment ring 541 is made of No. 45 steel with a conical inner wall. It is fitted on the outer surface of the movable seat 4 and fits against the outer end of the insert block 53. When the abutment ring 542 is pressed, the abutment ring 541 moves upward along the axial direction of the movable seat 4, and the conical inner wall separates from the outer end of the insert block 53, allowing the insert block 53 to slide freely. After being released, the elastic element 543 pushes the abutment ring 541 to reset, and the conical surface squeezes the insert block 53 to move towards the center of the slide groove 51 and clamps the pressure head 2. The conical surface design converts the axial force of the abutment ring 541 into the radial force of the insert block 53. Compared with planar contact, this improves the force transmission efficiency and ensures reliable engagement between the insert block 53 and the annular groove 3.

[0037] The elastic element 543 includes a movable ring 5431, a fixed ring 5432 and a spring 5433. The fixed ring 5432 is fixed on the surface of the movable seat 4. Several springs 5433 are installed between the fixed ring 5432 and the actuating ring 542. The movable ring 5431 for protecting the springs 5433 is fixedly installed on the top of the actuating ring 542.

[0038] It should be noted that the fixed ring 5432 is welded to the surface of the movable seat 4. Three springs 5433 are evenly distributed around the circumference between the fixed ring 5432 and the actuating ring 542. The movable ring 5431 moves synchronously with the actuating ring 542, and its inner wall fits against the surface of the movable seat 4 to form a dustproof cavity, preventing mortar dust from entering the springs 5433. The pre-compression of the springs 5433 is 5mm, providing a pre-tightening force of 15-20N. Compared with the exposed spring structure, the movable ring 5431 reduces the amount of dust adhering to the springs 5433, extending the maintenance cycle. When inspecting outdoor wall mortar, the movable ring 5431 can effectively block rainwater and dust from entering, ensuring that the springs 5433 can work normally in an environment of -10℃ to 50℃.

[0039] An assembly ring 8 is fixedly installed at the bottom of the main body 1 of the detector, and a housing 9 that fits against the wall is threaded onto the surface of the assembly ring 8;

[0040] The thread precision of the assembly ring 8 is 6g, ensuring that the fit clearance between the housing 9 and the assembly ring 8 is ≤0.1mm. The rubber sealing gasket is made of nitrile rubber (Shore A60 hardness), and its aging resistance meets the requirements for 5 years of use. During testing, the housing 9 is attached to the wall, and the extension length of the housing 9 is adjusted by the thread (adjustment range 0-20mm) to ensure that the pressure head 2 is perpendicular to the wall. When replacing the pressure head 2, the housing 9 is unscrewed to expose the replacement mechanism 5 at the bottom of the movable seat 4. The self-locking performance of the fine thread can prevent the housing 9 from loosening during vibration. Combined with the buffering effect of the rubber gasket and its self-locking function, the stability of the device's fit with the wall is improved during testing.

[0041] Both sides of the main body 1 of the detector are fixedly equipped with hand handles 10, and triggers 11 are provided on the surface;

[0042] The main body 1 of the detector is symmetrically equipped with hand handles 10 on both sides by bolts. The handles are made of PU foam material with anti-slip texture on the surface. The PU foam layer is 8mm thick, which improves the grip comfort compared to metal handles. The anti-slip texture adopts a diamond grid design, and the coefficient of friction remains above 0.8 even when hands are wet. When both hands hold the handles, the palms naturally fit the trigger 11 position, and the trigger force and stroke match the human finger movement habits. Compared with the traditional single-side handle design, the symmetrical handles improve the stability of the device when pressure is applied.

[0043] The detector body 1 involved in this application is implemented using existing mature technology, which is a conventional technical means in this field, so its working process will not be described in detail.

[0044] When the pressure head 2 needs to be replaced, rotate the housing 9 to separate it from the assembly ring 8, press the actuating ring 542 to move the contact ring 541, and squeeze multiple springs 5433. When the inner wall of the contact ring 541 does not fit against the outer edge of the four plugs 53 and does not limit the four plugs 53, the pressure head 2 can be pulled directly. The annular groove 3 on the surface of the pressure head 2 is arc-shaped, and both ends of the plugs 53 are arc-shaped to fit the annular groove 3, which facilitates the removal of the pressure head 2. When the pressure head 2 moves, the surface of the pressure head 2 will squeeze the four plugs 53 outward to replace the new plug. The end of the plug that enters the movable seat 4 is an annular ramp surface. The four insert blocks 53 are pressed into the sliding groove 51 inside the movable seat 4. When the insert blocks 53 move in the groove 52, the limiting block 6 on the surface of the insert block 53 will slide in the limiting groove 7 inside the groove 52 to prevent the insert blocks 53 from leaving the groove 52. After the installation of the pressure head 2 is completed, the pressure on the actuating ring 542 is released. The spring pushes the actuating ring 542 and the abutting ring 541. The bottom of the abutting ring 541 is an annular slope surface, which can press the four insert blocks 53 into the annular slot 3. As the abutting ring 541 moves, the inner wall of the abutting ring 541 fits against the outer end of the four insert blocks 53 and limits them to prevent the insert blocks 53 from moving, thus fixing the pressure head 2.

[0045] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A mechanical indentation device for testing the strength of building mortar, characterized in that, include: The instrument includes a main body (1), a pressure head (2), an annular groove (3), a movable seat (4), and a replacement mechanism (5). The main body (1) contains a movable seat (4), the lower end of which extends through the bottom of the main body (1). The surface of the pressure head (2) has an annular groove (3). The bottom of the movable seat (4) is fitted with the pressure head (2) via the replacement mechanism (5). The replacement mechanism (5) is used for easy loading and unloading of the pressure head (2).

2. The mechanical indentation device for testing the strength of building mortar according to claim 1, characterized in that: The replacement mechanism (5) includes a slide groove (51), a groove (52), a plug (53), and a baffle (54). The movable seat (4) has a slide groove (51) for inserting the pressure head (2). The movable seat (4) has four evenly distributed grooves (52) inside. A plug (53) is slidably installed in the groove (52). The end of the plug (53) is engaged with the annular slot (3). The baffle (54) is installed on the surface of the movable seat (4) to insert the four plugs (53) into the annular slot (3) to fix the pressure head (2).

3. The mechanical indentation device for testing the strength of building mortar according to claim 2, characterized in that: The top and bottom of the insert (53) are fixedly installed with limiting blocks (6), and the top and bottom of the groove (52) are provided with limiting grooves (7) for the sliding of the limiting blocks (6).

4. The mechanical indentation device for testing the strength of building mortar according to claim 3, characterized in that: The baffle (54) includes an abutment ring (541), a toggle ring (542) and an elastic element (543). The abutment ring (541) is sleeved on the surface of the movable seat (4), and the toggle ring (542) is fixedly installed on the surface. The elastic element (543) is installed between the movable seat (4) and the abutment ring (541) to limit the abutment ring (541) against the four inserts (53).

5. The mechanical indentation device for testing the strength of building mortar according to claim 4, characterized in that: The elastic element (543) includes a movable ring (5431), a fixed ring (5432), and a spring (5433). The fixed ring (5432) is fixed on the surface of the movable seat (4). A plurality of springs (5433) are installed between the fixed ring (5432) and the actuating ring (542). The movable ring (5431) for protecting the springs (5433) is fixedly installed on the top of the actuating ring (542).

6. The mechanical indentation device for testing the strength of building mortar according to claim 1, characterized in that: An assembly ring (8) is fixedly installed at the bottom of the main body (1) of the detector, and a shell (9) that fits against the wall is threaded onto the surface of the assembly ring (8).

7. The mechanical indentation device for testing the strength of building mortar according to claim 1, characterized in that: The detector body (1) is fixedly equipped with handles (10) on both sides, and has triggers (11) on its surface.

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