A penetration mortar strength detector calibration device

Abstract

The utility model relates to instrument calibration technical field especially is a kind of penetration type mortar strength detector calibration device, it includes: the support seat is connected to the bottom of cabinet, and double-speed drive mechanism is provided in cabinet;Hand wheel is located in the lateral wall outside cabinet, and the input end of double-speed drive mechanism is connected;Lifting mechanism is connected in the output end of double-speed drive mechanism;Lower crossbeam is connected in cabinet top, and lifting mechanism is located above lower crossbeam;Upper crossbeam is connected in lifting mechanism top;Clamping mechanism is set on lifting mechanism, and mortar strength detector is located in clamping mechanism;Load sensor is set in upper crossbeam bottom;Press head is connected in load sensor lower end;Grating displacement sensor is set in clamping mechanism bottom;Meter is electrically connected with load sensor, grating displacement sensor respectively, so that the whole calibration process is high accuracy and traceable, greatly improves calibration efficiency and reliability.

Description

Technical Field

[0001] This utility model relates to the field of instrument calibration technology, specifically to a calibration device for a penetration mortar strength tester. Background Technology

[0002] The penetration mortar strength tester calibration device is a specialized device used for traceability and performance verification of penetration mortar strength testers. It typically consists of standard strength curve materials with known hardness and mechanical properties (such as standard mortar test blocks or high-precision hardness blocks) and a matching positioning, loading, and measurement system. By simulating the actual testing process, it calibrates the key parameters of the tester, such as penetration depth and penetration force, to ensure the accuracy and reliability of its measurement results, thereby guaranteeing the accuracy of the estimated strength of masonry mortar in the field.

[0003] However, traditional calibration devices are cumbersome to operate, inefficient, and heavily reliant on the operator's experience and feel, resulting in poor consistency of calibration results. Utility Model Content

[0004] The purpose of this invention is to provide a calibration device for a penetration mortar strength tester, addressing the shortcomings of the prior art and solving the problems mentioned in the background art.

[0005] To achieve the above objectives, the technical solution adopted in this utility model embodiment is as follows:

[0006] A calibration device for a penetration mortar strength tester includes: a housing with a support base connected to the bottom, and a dual-speed drive mechanism installed inside the housing;

[0007] The handwheel is located outside the side wall of the chassis and is connected to the input end of the dual-speed drive mechanism;

[0008] The lifting mechanism is connected to the output end of the dual-speed drive mechanism;

[0009] A lower crossbeam is connected to the top of the chassis, and the lifting mechanism is located above the lower crossbeam;

[0010] The upper crossbeam is connected to the top of the lifting mechanism;

[0011] A clamping mechanism is installed on the lifting mechanism, and the mortar strength tester is located inside the clamping mechanism;

[0012] A load sensor is installed at the bottom of the upper crossbeam;

[0013] The pressure head is connected to the lower end of the load sensor;

[0014] A grating displacement sensor is disposed at the bottom of the clamping mechanism;

[0015] The instrument is electrically connected to the load sensor and the grating displacement sensor, respectively.

[0016] Furthermore, in this invention, the dual-speed drive mechanism includes:

[0017] A gearbox, wherein the input end of the gearbox is connected to the handwheel;

[0018] A concave support plate, with its open end connected to the bottom of the lower crossbeam;

[0019] A speed reducer is connected to the bottom of the concave support plate, and the input end of the speed reducer is connected to the output end of the gearbox.

[0020] The drive wheel is connected to the output end of the reducer;

[0021] Two driven wheels are located on either side of the driving wheel, and the two driven wheels are arranged diagonally. The two driven wheels are respectively connected to the lifting mechanism.

[0022] An adjustable support frame is connected to the bottom of the lower crossbeam;

[0023] Two tensioning wheels are located inside the two driven wheels, and the two tensioning wheels are located outside the driving wheel, and the two tensioning wheels are connected to an adjustable support frame;

[0024] An annular belt is sequentially fitted onto the driving pulley, two tensioning pulleys, and two driven pulleys.

[0025] Furthermore, in this utility model, the lifting mechanism includes:

[0026] Two lead screws are respectively connected to the two driven wheels, and are rotatably connected to the lower crossbeam;

[0027] Two guide rods are respectively connected to the lower crossbeam, and the two lead screws and the two guide rods are respectively diagonally arranged;

[0028] The other ends of the two lead screws are respectively rotatably connected to the upper crossbeam, and the other ends of the two guide rods are respectively connected to the upper crossbeam;

[0029] A movable crossbeam is located between the upper crossbeam and the lower crossbeam, and is threadedly connected to the two lead screws and slidably connected to the two guide rods respectively;

[0030] The clamping mechanism is located at the top of the moving crossbeam, and the grating displacement sensor is located at the bottom of the moving crossbeam.

[0031] Furthermore, in this utility model, the clamping mechanism includes:

[0032] Two fixed seats are respectively connected to the top of the movable crossbeam;

[0033] The bidirectional lead screw and the guide shaft are respectively located between the two fixed seats, and the two ends of the bidirectional lead screw are respectively rotatably connected to the two fixed seats, and the two ends of the guide shaft are respectively fixed to the two fixed seats;

[0034] A handle is attached to one end of the bidirectional lead screw;

[0035] Two positioning bushings are rotatably connected to the bidirectional lead screw and the guide shaft at halfway points, respectively;

[0036] A positioning plate is connected between two positioning bushings, and a positioning hole is provided in the center of the positioning plate;

[0037] Two clamping blocks are respectively threaded onto the bidirectional lead screw and slidably connected to the guide shaft, and the two clamping blocks are arranged facing each other, with the mortar strength tester placed between the two clamping blocks.

[0038] Furthermore, in this utility model, both clamping blocks include:

[0039] A convex block, the lower part of which is threaded to the bidirectional lead screw and slidably connected to the guide shaft, and the upper part of which is provided with a trapezoidal groove.

[0040] Compared with the prior art, the beneficial effects of this utility model are:

[0041] This device achieves a combination of high efficiency and precision through a dual-speed drive mechanism, high-precision measurement of force and displacement through load sensors and grating displacement sensors, and stability of the mortar strength tester being calibrated through a clamping mechanism. All data is collected and displayed uniformly by the instrument, making the entire calibration process highly accurate and traceable, greatly improving calibration efficiency and reliability. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the overall structure of a calibration device for a penetration mortar strength tester according to the present invention.

[0043] Figure 2 This is a schematic diagram of the clamping mechanism of a calibration device for a penetration mortar strength tester according to the present invention.

[0044] Figure 3 This is a schematic diagram of the clamping mechanism of a calibration device for a penetration mortar strength tester according to the present invention.

[0045] Figure 4This is a schematic diagram of the dual-speed drive mechanism of a calibration device for a penetration mortar strength tester according to the present invention.

[0046] Figure 5 This is a schematic diagram of the dual-speed drive mechanism of a calibration device for a penetration mortar strength tester according to the present invention.

[0047] Figure 6 This is a schematic diagram of the dual-speed drive mechanism of a penetration mortar strength tester calibration device according to the present invention.

[0048] In the diagram: 1-Chassis; 2-Support base; 3-Handwheel; 4-Lifting mechanism; 5-Lower crossbeam; 6-Upper crossbeam; 7-Clamping mechanism; 8-Mortar strength tester; 9-Load sensor; 10-Pressure head; 11-Grate displacement sensor; 12-Instrument; 31-Gearbox; 32-Concave support plate; 33-Reducer; 34-Drive wheel; 35-Driven wheel; 36-Adjustable support frame; 37-Tension wheel; 38-Annular belt; 3 11-First large gear; 312-Second large gear; 313-First small gear; 314-Second small gear; 41-Lead screw; 42-Guide rod; 43-Moving crossbeam; 71-Fixed seat; 72-Double-acting lead screw; 73-Guide shaft; 74-Handle; 75-Positioning bushing; 76-Positioning plate; 77-Positioning hole; 78-Clamping block; 781-Convex block; 782-Positive trapezoidal groove; 13-Penetrating rod 13; 14-Handle 14. Detailed Implementation

[0049] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0050] like Figures 1-6 As shown, a calibration device for a penetration-type mortar strength tester includes: a housing 1 with a support base 2 connected to the bottom, and a dual-speed drive mechanism installed inside the housing 1; a handwheel 3 located outside the side wall of the housing 1 and connected to the input end of the dual-speed drive mechanism; a lifting mechanism 4 connected to the output end of the dual-speed drive mechanism; a lower crossbeam 5 connected to the top of the housing 1, with the lifting mechanism 4 located above the lower crossbeam 5; an upper crossbeam 6 connected to the top of the lifting mechanism 4; a clamping mechanism 7 installed on the lifting mechanism 4, with the mortar strength tester 8 located inside the clamping mechanism 7; a load sensor 9 installed at the bottom of the upper crossbeam 6; a pressure head 10 connected to the lower end of the load sensor 9; a grating displacement sensor 11 installed at the bottom of the clamping mechanism 7; and an instrument 12 electrically connected to the load sensor 9 and the grating displacement sensor 11, respectively.

[0051] In this application, the housing 1 is used to house and protect the internal dual-speed drive mechanism; the support base 2 is used to stably support the entire device; the dual-speed drive mechanism can select between a fast speed and a slow speed via a handwheel 3 (input end), outputting power to the lifting mechanism 4, thus achieving "coarse adjustment" and "fine adjustment" speeds. The fast speed is used to quickly approach the target position, improving efficiency; the slow speed is used to precisely control the displacement of the pressure head 10, ensuring a smooth and controllable loading process, meeting the requirements of high-precision calibration; the handwheel 3 is located outside the housing 1 and serves as the interface for manual operation by the operator, directly connected to the input end of the dual-speed drive mechanism, driving the entire system by rotating the handwheel 3; the lifting mechanism 4 is connected to the output end of the dual-speed drive mechanism, converting rotational motion into linear motion, driving the mortar strength tester 8 being calibrated to move up and down as a whole, achieving precise vertical displacement; the clamping mechanism 7 is installed on the lifting mechanism. Mechanism 4 is used to firmly clamp and fix the mortar strength tester 8 to be calibrated, ensuring that the instrument being calibrated remains in a fixed position during the calibration process and will not move or loosen, thus guaranteeing the accurate transmission of the load force and the repeatability of the measurement. Load sensor 9 is installed at the bottom of the upper crossbeam 6 to measure the pressure (load) applied to the mortar strength tester 8 in real time, providing high-precision force measurement. Grating displacement sensor 11 is set at the bottom of the clamping mechanism to accurately measure the penetration depth (displacement) of the penetration rod 13 of the mortar strength tester 8. Instrument 12 serves as a data acquisition and display terminal, electrically connected to load sensor 9 and grating displacement sensor 11, receiving, processing, and displaying force and displacement data in real time, providing operators with intuitive readings, facilitating monitoring of the calibration process, recording calibration data, and comparing the readings with those of the instrument being calibrated to complete the calibration work.

[0052] The device achieves a combination of high efficiency and precision through a dual-speed drive mechanism, and realizes high-precision measurement of force and displacement through load sensor 9 and grating displacement sensor 11. The clamping mechanism 7 ensures the stability of the mortar strength tester 8 being calibrated. All data are collected and displayed uniformly by instrument 12, making the entire calibration process highly accurate and traceable, greatly improving calibration efficiency and reliability.

[0053] Furthermore, the dual-speed drive mechanism includes: a gearbox 31, the input end of which is connected to the handwheel 3; a concave support plate 32, the open end of which is connected to the bottom of the lower crossbeam 5; a reducer 33, connected to the bottom of the concave support plate 32, and the input end of the reducer 33 is connected to the output end of the gearbox 31; a drive wheel 34, connected to the output end of the reducer 33; two driven wheels 35, located on both sides of the drive wheel 34, and arranged diagonally, and connected to the lifting mechanism 4; an adjustable support frame 36, connected to the bottom of the lower crossbeam 5; two tensioning wheels 37, located inside the two driven wheels 35, located outside the drive wheel 34, and connected to the adjustable support frame 36; and an annular belt 38, sequentially fitted onto the drive wheel 34, the two tensioning wheels 37, and the two driven wheels 35.

[0054] In this embodiment, the gearbox 31 serves as the core of the dual-speed switching mechanism. It receives input torque from the handwheel 3 and contains two sets of gears with different transmission ratios. By switching between them, it achieves two output speeds: a "fast gear" and a "slow gear." The specific working process is as follows: When the handwheel 3 is pushed inward, it drives the entire double gear consisting of the first large gear 311 and the first small gear 313 to move axially, causing the first small gear 313 to mesh with the second large gear 312. At this time, the first small gear 313 drives the second large gear 312 to rotate, thereby achieving slow rotation. When the handwheel 3 is pulled outward, it drives the entire first large gear 311 and the first small gear 313 to move axially in the opposite direction. The first small gear 313 disengages from the second large gear 312, while the first large gear 311 meshes with the second small gear 314. At this time, the first large gear 311 drives the second small gear 314 to rotate, thereby achieving fast rotation.

[0055] The reducer 33 further reduces the speed and increases the output torque, that is, it provides a greater torque output in the "slow gear", ensuring that the lifting mechanism 4 can be driven smoothly and accurately even under high load, thereby enhancing the system's load-bearing capacity and control precision. The annular belt 38 is a closed annular belt that is sequentially wrapped around the driving pulley 34, two tension pulleys 37 and two driven pulleys 35, so as to transmit the rotational motion of the driving pulley to the two driven pulleys in a flexible manner, ensuring that the two driven pulleys rotate strictly synchronously and guaranteeing the smooth operation of the lifting mechanism 4.

[0056] This dual-speed drive mechanism cleverly combines the advantages of gear transmission (speed change, torque increase) and synchronous belt transmission (synchronization, smoothness, vibration reduction). It achieves both fast and slow speeds through a gearbox to meet the needs of different operating stages; synchronous and smooth lifting is achieved through symmetrical double driven pulleys and a ring belt; and an adjustable tensioner ensures long-term reliable belt operation. The entire system boasts advantages such as labor-saving operation, precise control, smooth operation, good synchronization, and high reliability, providing a solid power and transmission foundation for the high-precision calibration of the penetration mortar strength tester 8.

[0057] Furthermore, the lifting mechanism 4 includes: two lead screws 41, each connected to two driven wheels 35 and rotatably connected to the lower crossbeam 5; two guide rods 42, each connected to the lower crossbeam 5, and diagonally arranged between the two lead screws 41 and the two guide rods 42; the other ends of the two lead screws 41 are rotatably connected to the upper crossbeam 6, and the other ends of the two guide rods 42 are connected to the upper crossbeam 6; a movable crossbeam 43, located between the upper crossbeam 6 and the lower crossbeam 5, and threadedly connected to the two lead screws 41 and slidably connected to the two guide rods 42; a clamping mechanism 7 is disposed on the top of the movable crossbeam 43, and a grating displacement sensor 11 is disposed on the bottom of the movable crossbeam 43.

[0058] In this embodiment, the two lead screws 41 and the two guide rods 42 are diagonally arranged. This layout can effectively prevent the moving crossbeam from twisting or "getting stuck" during the lifting and lowering process. Even if there are minor errors in the manufacturing or installation of the two lead screws, the diagonal arrangement can still coordinate through the structure itself to ensure that the moving crossbeam always lifts and lowers smoothly and horizontally.

[0059] Furthermore, the clamping mechanism 7 includes: two fixed seats 71, respectively connected to the top of the movable crossbeam 43; a bidirectional lead screw 72 and a guide shaft 73 respectively located between the two fixed seats 71, with both ends of the bidirectional lead screw 72 rotatably connected to the two fixed seats 71, and both ends of the guide shaft 73 respectively fixed to the two fixed seats 71; a handle 74 connected to one end of the bidirectional lead screw 72; two positioning bushings 75, respectively rotatably connected to the bidirectional lead screw 72 and the guide shaft 73 at halfway points; a positioning plate 76 connected between the two positioning bushings 75, with a positioning hole 77 provided in the center of the positioning plate 76; two clamping blocks 78, respectively threadedly connected to the bidirectional lead screw 72 and slidably connected to the guide shaft 73, with the two clamping blocks 78 facing each other, and the mortar strength tester 8 placed between the two clamping blocks 78.

[0060] In this embodiment, when the handle 74 is rotated, the two clamping blocks 78 will simultaneously move closer to the center (clamp) or simultaneously separate to the sides (release) due to the opposite rotation of the left and right threads. This design ensures the symmetrical application of clamping force and avoids instrument tilting or uneven force caused by unilateral clamping. The positioning plate 76 itself is designed to remain stationary, thereby ensuring that the position of the positioning hole 77 is always stable in the center. That is, the positioning hole 77 provides a fixed central reference, ensuring that the central axis of the clamped mortar strength tester 8 is strictly aligned with the loading axis (center of the pressure head) of the calibration device. This avoids eccentric loading and ensures the accurate transmission of calibration force and the accuracy of measurement.

[0061] Furthermore, both clamping blocks 78 include a convex block 781, the lower part of which is threadedly connected to the bidirectional lead screw 72 and slidably connected to the guide shaft 73, and the upper part of the convex block 781 is provided with a trapezoidal groove 782.

[0062] In this embodiment, when the mortar strength tester 8 is clamped, the small end of the trapezoidal slot 782 will be inserted into and clamp the vertical edges of the mortar strength tester 8's insertion rod 13 housing and the two handles 14, while the large end of the trapezoidal slot 782 will symmetrically clamp the two handles 14, thereby achieving a stable clamping capability.

[0063] Furthermore, the calibration device for the penetration mortar strength tester is 400mm long, 250mm wide, and 810mm high.

[0064] In this embodiment, the device is small in size and easy to carry.

[0065] The specific usage process of this penetration mortar strength tester calibration device is as follows:

[0066] ① Preparations:

[0067] Place the calibration device in this patent stably on a sturdy, level workbench, ensuring that the support base 2 at the bottom of the chassis 1 is fully in contact with the workbench and that the device does not wobble; then check whether the instrument 12 is correctly connected to the power supply and reliably connected to the load sensor 9 and the grating displacement sensor 11 via data cables; finally, turn on the instrument power, preheat it and reset it to zero, ensuring that the force value and displacement reading are both zero.

[0068] ② Installation of mortar strength tester 8:

[0069] Pull the handwheel 3 outwards to switch to the fast gear, then rotate the handwheel 3. Through the dual-speed drive mechanism and belt drive, the two lead screws 41 are driven to rotate. The lead screws 41 drive the moving crossbeam 43 to rise rapidly, leaving enough space between the pressure head 10 at the bottom of the upper crossbeam 6 and the moving crossbeam 43. Then, place the insertion rod 13 of the mortar strength tester 8 to be calibrated upwards, aligning the bottom of the insertion rod 13 with the positioning hole 77. Then, rotate the handle 74 clockwise to drive the bidirectional lead screw 72 to rotate. Continue rotating the handle until the mortar strength tester 8 is firmly clamped between the two clamping blocks 78 without any shaking. Then, stop rotating the handle 74. At this time, the central axis of the mortar strength tester 8 should be aligned with the loading axis (center of the pressure head) of the calibration device.

[0070] ③ Use of the calibration device in this patent:

[0071] Push the handwheel 3 inward to switch to the slow gear (double gear transmission, with the first small gear 313 meshing with the second large gear 312). At this time, the system obtains the maximum reduction ratio, which can be finely adjusted. Slowly and evenly rotate the handwheel 3 in the forward direction. The power is transmitted to the two driven wheels 35 through the dual-speed drive mechanism, reducer 33, drive wheel 34, and ring belt 38. This drives the two lead screws 41 to rotate slowly and synchronously. The lead screws 41 drive the moving crossbeam 43 (along with the clamped mortar strength tester 8) to rise smoothly. The penetration rod 13 of the mortar strength tester 8 gradually pushes the pressure head 10 upward. The load sensor 9 measures the applied force value in real time, and the grating displacement sensor 11 measures the displacement of the penetration rod 13 in real time (i.e., the reverse simulation of the "penetration depth"). The instrument 12 displays the current load value (N) and displacement value (mm) simultaneously.

[0072] ④ Slowly rotate the handwheel 3 in the opposite direction (outward) to make the moving beam 43 slowly descend, gradually releasing the force applied to the mortar strength tester 8. Observe the instrument 12 to ensure that the force value returns to zero smoothly. After complete unloading, rotate the handle 74 counterclockwise to make the two clamping blocks 78 move outward synchronously, release the mortar strength tester 8, and the calibration is complete.

[0073] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, the phrase "comprising an element defined as..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0074] 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 calibration device for a penetration mortar strength tester, characterized in that, include: The chassis (1) has a support base (2) connected to the bottom, and a dual-speed drive mechanism is provided inside the chassis (1). The handwheel (3) is located outside the side wall of the housing (1) and is connected to the input end of the dual-speed drive mechanism; The lifting mechanism (4) is connected to the output end of the dual-speed drive mechanism; The lower crossbeam (5) is connected to the top of the chassis (1), and the lifting mechanism (4) is located above the lower crossbeam (5); The upper crossbeam (6) is connected to the top of the lifting mechanism (4); A clamping mechanism (7) is installed on the lifting mechanism (4), and a mortar strength tester (8) is located inside the clamping mechanism (7); A load sensor (9) is installed at the bottom of the upper crossbeam (6); The pressure head (10) is connected to the lower end of the load sensor (9); A grating displacement sensor (11) is disposed at the bottom of the clamping mechanism (7); The instrument (12) is electrically connected to the load sensor (9) and the grating displacement sensor (11), respectively.

2. The calibration device for the penetration mortar strength tester according to claim 1, characterized in that, The dual-speed drive mechanism includes: A gearbox (31) is connected to the handwheel (3) at its input end. A concave support plate (32) has its open end connected to the bottom of the lower crossbeam (5); A reducer (33) is connected to the bottom of the concave support plate (32), and the input end of the reducer (33) is connected to the output end of the gearbox (31); The drive wheel (34) is connected to the output end of the reducer (33); Two driven wheels (35) are located on both sides of the driving wheel (34), and the two driven wheels (35) are arranged diagonally. The two driven wheels (35) are connected to the lifting mechanism (4) respectively. An adjustable support frame (36) is connected to the bottom of the lower crossbeam (5); Two tensioning wheels (37) are located inside the two driven wheels (35), and the two tensioning wheels (37) are located outside the driving wheel (34), and the two tensioning wheels (37) are connected to the adjustable support frame (36); An annular belt (38) is sequentially fitted onto the driving pulley (34), two tension pulleys (37), and two driven pulleys (35).

3. The calibration device for the penetration mortar strength tester according to claim 2, characterized in that, The lifting mechanism (4) includes: Two lead screws (41) are respectively connected to two driven wheels (35) and are rotatably connected to the lower crossbeam (5); Two guide rods (42) are respectively connected to the lower crossbeam (5), and the two lead screws (41) and the two guide rods (42) are respectively diagonally arranged; The other ends of the two lead screws (41) are rotatably connected to the upper crossbeam (6), and the other ends of the two guide rods (42) are connected to the upper crossbeam (6); The movable crossbeam (43) is located between the upper crossbeam (6) and the lower crossbeam (5), and is threadedly connected to the two lead screws (41) and slidably connected to the two guide rods (42); The clamping mechanism (7) is located at the top of the moving crossbeam (43), and the grating displacement sensor (11) is located at the bottom of the moving crossbeam (43).

4. The calibration device for the penetration mortar strength tester according to claim 3, characterized in that, The clamping mechanism (7) includes: Two fixed seats (71) are respectively connected to the top of the movable crossbeam (43); The bidirectional lead screw (72) and the guide shaft (73) are respectively located between the two fixed seats (71), and the two ends of the bidirectional lead screw (72) are respectively rotatably connected to the two fixed seats (71), and the two ends of the guide shaft (73) are respectively fixed to the two fixed seats (71); A handle (74) is connected to one end of the bidirectional lead screw (72); Two positioning bushings (75) are rotatably connected to the bidirectional lead screw (72) and the guide shaft (73) at halfway points, respectively; The positioning plate (76) is connected between two positioning bushings (75), and the positioning plate (76) has a positioning hole (77) at its center. Two clamping blocks (78) are threadedly connected to the bidirectional lead screw (72) and slidably connected to the guide shaft (73), and the two clamping blocks (78) are arranged facing each other. The mortar strength tester (8) is placed between the two clamping blocks (78).

5. The calibration device for the penetration mortar strength tester according to claim 4, characterized in that, Both clamping blocks (78) include: A convex block (781) is provided with its lower part threadedly connected to the bidirectional lead screw (72) and slidably connected to the guide shaft (73). The upper part of the convex block (781) is provided with a trapezoidal groove (782).

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