Filling body strength in-situ testing device based on magnetic impact

Abstract

The utility model belongs to the technical field of filling body safety engineering, and particularly provides a filling body strength in-situ testing device based on magnetic impact, which comprises a shell, an electromagnetic power device, a springback mechanism and a value indicating mechanism, the springback mechanism comprises a springback rod, a springback hammer, a center guide rod, an elastic piece and a limiting piece. The elastic striking rod is arranged at the head end of the shell; the elastic hammer is arranged on one side of the elastic rod and is fixed with the elastic rod; the center guide rod is arranged on one side of the elastic hammer, the head end penetrates through the elastic hammer to be fixedly connected with the elastic rod, and the tail end is fixedly connected with the electromagnetic power device. The limiting piece is fixed on the central guide rod; the elastic piece is located on one side of the limiting piece and fixed to the shell. The indicating mechanism is arranged on one side of the central guide rod. The electromagnetic power device drives the springback mechanism to test the strength of the filling body, the structure is simple and convenient, and the limitation of environmental factors can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of filling body safety engineering, in particular to an in-situ testing device for filling body strength based on magnetic impact. Background Art

[0002] Backfill mining is a mining method that uses pipelines to transport backfill slurry to the goaf to effectively control the ground pressure in the goaf, maintain the stability of the goaf, and prevent the collapse of the surrounding rock above the goaf. In recent years, with the country's increasing efforts in production safety management and the gradual formation of a production safety concept in mining enterprises, backfill mining has been applied in most domestic metal mines. Considering cost and support strength, backfill materials are usually used for support. Common backfill materials include high-water materials or paste materials, which are mainly composed of lower-strength materials such as coal gangue. Although the strength of the backfill is usually lower than that of concrete materials, its purpose is only to prevent excessive collapse. However, the backfill still needs to have a certain strength to support the goaf roof, so strength testing is required to assess whether it can maintain the balance of the goaf.

[0003] At present, the strength of filling materials is often tested by means of a rebound hammer or other filling material strength detection device. However, most rebound hammers are currently suitable for testing concrete or high-strength rock. Since underground filling materials have relatively low strength, if concrete or high-strength rebound hammers are used for testing, the rebound value will be large and the surface of the test material will be easily damaged, affecting the measurement accuracy of the rebound hammer.

[0004] In this regard, in order to solve the problems existing in the prior art, those skilled in the art have made many efforts. For example, Chinese patent application CN 117517081A proposes a compressive strength testing device for a collaborative deformation test of surrounding rock and filling body. By setting a first hydraulic press and a second hydraulic press to simultaneously drive the top plate and the upper platform to move downward, the pattern can be squeezed from the top and bottom at the same time, and by setting the upper and lower platforms, pressure can be applied to the entire top and bottom surfaces of the pattern, thereby ensuring that the pressure on the pattern in the horizontal direction is balanced and uniform. However, it is necessary to first sample and then test the sample during the test, which is easily affected by the environment. Utility Model Content

[0005] To solve the above problems, the utility model provides an in-situ filling body strength testing device based on magnetic impact, which drives the rebound mechanism through an electromagnetic power device to perform filling body strength testing. It has a simple structure and can avoid the limitations of environmental factors.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is an in-situ testing device for the strength of a filling body based on magnetic impact, comprising a shell, an electromagnetic power device, a rebound mechanism and an indicating mechanism; the rebound mechanism comprises a striking rod, a striking hammer, a central guide rod, an elastic member and a limiting member; the striking rod is arranged at the head end of the shell; the striking hammer is arranged at one side of the striking rod and is fixed to the striking rod; the central guide rod is arranged at one side of the striking hammer, the head end passes through the striking hammer and is fixedly connected to the striking rod, and the tail end is fixedly connected to the electromagnetic power device; the limiting member is fixed on the central guide rod; the elastic member is located on one side of the limiting member and is fixed to the shell; the indicating mechanism is arranged on one side of the central guide rod.

[0007] Furthermore, the electromagnetic power device includes a movable iron core, a fixed iron core, a mounting seat and a coil; a slide rail is provided under the movable iron core; the movable iron core is slidably connected to the slide rail through a slider; the center guide rod is fixedly connected to the movable iron core; the mounting seat is fixed on the shell, a center hole is opened on the mounting seat, and the fixed iron core is fixed on one side of the center hole; the coil is placed on the mounting seat, and is used to connect an external power supply to form an electromagnet to drive the movable iron core to move.

[0008] Furthermore, the indicating mechanism includes a base, a pointer shaft and a measuring slider; the pointer shaft is fixed to the housing through the base, and the measuring slider is sleeved on the pointer shaft and slidably connected to the pointer shaft.

[0009] Furthermore, the pointer shaft is arranged in parallel with the central guide rod; a spring sheet is also provided on the pointer shaft; the spring sheet is slidably connected to the pointer shaft, and is used to push the spring sheet through a spring hammer to indirectly push the measuring slider to slide.

[0010] Furthermore, a level is provided on the shell.

[0011] Furthermore, the shell body is provided with a top cover at the front end and a bottom cap at the rear end; a through hole is opened on the top cover, and the impact rod extends out from the through hole.

[0012] Furthermore, a handle is provided at the lower portion of the shell, and a button is provided on the handle for controlling the operation and reset of the rebound mechanism.

[0013] The technical solution of the utility model has the following beneficial effects:

[0014] 1. The utility model forms a filling strength measuring device by integrating a rebound mechanism, an electromagnetic power device and an indicating mechanism into a shell. The overall structure is compact and easy to use. When in use, it is only necessary to move the impact rod in the rebound mechanism close to the filling body and then drive it through the electromagnetic power device. This makes it free from environmental constraints and more suitable for testing low-strength filling bodies or soft rock tests.

[0015] 2. The utility model adopts a nano-silicone impact rod to contact the filling body, and utilizes its own characteristics to better adapt to the surface of the low-strength filling body, avoiding the situation where the hard impact rod cracks the surface of the test body and affects the test accuracy, and can avoid the problem of reduced accuracy caused by wear of the original impact rod or wear of the buffer spring, while ensuring the accuracy of the filling body strength test, it can save the cost of the rebound device.

[0016] 3. The utility model energizes the coil and cooperates with the fixed iron core to produce an electromagnetic effect, thereby pulling the movable iron core to move. The movable iron core moves by cooperating with the slider and the slide rail, which can achieve the purpose of self-lubrication and can better reduce the friction error caused by manual operation, thereby achieving more accurate guide positioning and result numerical measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments and in conjunction with the accompanying drawings.

[0018] Figure 1 It is a schematic diagram of the in-situ testing device for filling body strength based on magnetic impact described in the present invention.

[0019] Figure 2 It is a schematic diagram of an electromagnetic power device.

[0020] Figure 3 It is a schematic diagram of the indicating mechanism.

[0021] Among them, 1-rebound mechanism; 11-strike rod; 12-strike hammer; 13-center guide rod; 14-elastic part; 15-limiting part; 2-electromagnetic power device; 21-movable iron core; 22-fixed iron core; 23-mounting seat; 24-coil; 25-slide rail; 3-indicating mechanism; 31-base; 32-pointer shaft; 33-measuring slider; 34-spring sheet; 4-housing; 41-top cover; 42-bottom cap; 43-level; 44 handle. DETAILED DESCRIPTION

[0022] The technical solution of the present invention is further described below in conjunction with the accompanying drawings, but is not limited thereto. Any modification or equivalent replacement of the technical solution of the present invention that does not depart from the spirit and scope of the technical solution of the present invention should be included in the scope of protection of the present invention.

[0023] like Figure 1-3 As shown, this embodiment proposes an in-situ filling body strength testing device based on magnetic impact, including a shell 4, a rebound mechanism 1, an electromagnetic power device 2 and an indicating mechanism 3; the rebound mechanism 1 is arranged in the shell 4, the electromagnetic power device 2 is arranged at the tail of the rebound mechanism 1 and is connected to the rebound mechanism 1, and the indicating mechanism 3 is located on one side of the rebound mechanism 1 and is fixed on the shell 4. The rebound mechanism 1 is driven by the electromagnetic power device 2 to perform a filling body strength test, and the measured strength data is displayed by the indicating mechanism 3, thereby completing the test process.

[0024] A top cover 41 is provided on the left side of the shell 4, and a bottom cap 42 is provided on the right side. The top cover 41 is conical and has a circular hole on the top; the rebound mechanism 1 includes a striking rod 11, a striking hammer 12, a center guide rod 13, a limiter 15 and an elastic member 14 made of nano-silicone material, wherein the limiter 15 is in the shape of a hook and the elastic member 14 is a compression spring; the striking rod 11 is located on the far left and is provided in the top cover 41, and the top end extends from the circular hole on the top cover 41, the striking hammer 12 is in the shape of a boss, is located on the right side of the striking rod 11, and is fixedly connected to the striking rod 11; a through hole is provided in the middle of the striking hammer 12, the head end of the center guide rod 13 passes through the striking hammer 12 and is fixed to the striking rod 11, and the tail end extends to the electromagnetic power device 2 and is fixedly connected at the electromagnetic power device 2, the limiter 15 is fixed on the center guide rod 13, and the compression spring is provided on the right side of the limiter 15, and the limiter 15 is against the compression spring for compressing the compression spring during operation.

[0025] The electromagnetic power device 2 includes a movable iron core 21, a fixed iron core 22, a mounting seat 23 and a coil 24. A slide rail 25 is provided under the movable iron core 21 and the fixed iron core 22. The movable iron core 21 is slidably connected to the slide rail 25 through a slider. The slider is made of powder metallurgy material and is fixedly connected to the center guide rod 13 on the left side. The mounting seat 23 is fixed on the shell 4. A center hole is opened in the center of the mounting seat 23, and the fixed iron core 22 is fixed to the right side of the center hole; the coil 24 is symmetrically arranged on the mounting seat 23, and the coil 24 is externally connected to a power supply; when in use, the coil 24 is energized to form an electromagnetic effect, so that the movable iron core 21 can be attracted to move to the right by magnetic force, thereby driving the center rod to move to the right, causing the limiter 15 to squeeze the compression spring to realize energy storage. At this time, the power supply is disconnected to remove the attraction to the movable iron core 21, so that under the action of the compression spring, the center guide rod 13 can be ejected, thereby driving the impact rod 11 to eject out to perform the filling body strength test.

[0026] The indicating mechanism 3 comprises a base 31, a pointer shaft 32, and a measuring slide 33. The pointer shaft 32 is engraved with a scale and is arranged parallel to the central guide rod 13. It is fixed to the housing 4 via the base 31. The measuring slide 33 is sleeved on the pointer shaft 32 and is slidably connected to the pointer shaft 32. The pointer shaft 32 is also provided with a spring plate 34, which can slide on the pointer shaft 32. During use, when the impact rod 11 strikes the filling body and rebounds, it drives the impact hammer 12 to rebound, that is, to move to the right. During this movement, the impact hammer 12 contacts the spring plate 34, pushing the spring plate 34 to push the measuring slide 33 to slide on the pointer shaft 32. After the measuring slide 33 stops sliding, the data can be read based on its position and the scale on the pointer shaft 32.

[0027] Preferably, a level 43 is provided on the housing 4 to ensure that the center guide rod 13 is horizontal during use, thereby avoiding inaccurate measurements due to angles. A handle is provided below the housing 4, with two buttons, an impact button and a reset button, which are used to control the rebound mechanism 1 through the electromagnetic power device 2 to perform an impact test and to reset the rebound mechanism 1 after the test.

[0028] Working principle:

[0029] When in use, place the entire device in front of the filling body, adjust the angle of the entire device by observing the spirit level 43 to ensure that it is in a horizontal position, then turn on the switch and press the impact button to energize the coil 24, so that it can cooperate with the fixed iron core 22 to produce an electromagnetic effect, so that the movable iron core 21 can be attracted to the right by magnetic force, thereby driving the center rod to move to the right, so that the limiter 15 squeezes the compression spring to realize energy storage. At this time, disconnect the power supply to remove the attraction to the movable iron core 21, so that under the action of the compression spring, the center guide rod 13 can be ejected, thereby driving the ejection rod 11 to eject. When the ejection rod 11 After hitting the filling body, a rebound phenomenon occurs. At this time, the impact rod 11 drives the impact hammer 12 to move to the right. The impact hammer 12 touches the spring sheet 34 during the movement and pushes the spring sheet 34 to drive the measuring slider 33 to slide on the pointer shaft 32. After the measuring slider 33 stops sliding, the data can be read according to its position and the scale on the pointer shaft 32. When multiple sets of data need to be collected, multiple impact operations can be performed to obtain multiple measurement data. After the last measurement is completed, press the reset button to drive the movable iron core 21 back to the initial position through the electromagnetic effect, thereby completing the entire filling body strength measurement process.

[0030] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An in-situ testing device for filling body strength based on magnetic impact, characterized in that: It comprises a housing (4), an electromagnetic power device (2), a rebound mechanism (1) and an indicating mechanism (3); The rebound mechanism (1) comprises a rebound rod (11), a rebound hammer (12), a central guide rod (13), an elastic member (14) and a limiting member (15); The impact rod (11) is provided at the front end of the shell (4); the impact hammer (12) is provided at one side of the impact rod (11) and is fixed to the impact rod (11); the central guide rod (13) is provided at one side of the impact hammer (12), the front end of which passes through the impact hammer (12) and is fixedly connected to the impact rod (11), and the rear end of which is fixedly connected to the electromagnetic power device (2); the limiting member (15) is fixed to the central guide rod (13); the elastic member (14) is located at one side of the limiting member (15) and is fixed to the shell (4); the indicating mechanism (3) is provided at one side of the central guide rod (13); A level (43) is provided on the housing (4); A handle is provided at the lower portion of the housing, and a button is provided on the handle for controlling the operation and resetting of the rebound mechanism (1).

2. The in-situ filling strength testing device based on magnetic impact according to claim 1 is characterized in that: The electromagnetic power device (2) comprises a movable iron core (21), a fixed iron core (22), a mounting seat (23) and a coil (24); a slide rail (25) is provided under the movable iron core (21); the movable iron core (21) is slidably connected to the slide rail (25) via a slider; a center guide rod (13) is fixedly connected to the movable iron core (21); the mounting seat (23) is fixed on the housing (4), a center hole is provided on the mounting seat (23), and the fixed iron core (22) is fixed to one side of the center hole; the coil (24) is placed on the mounting seat (23) and is used to form an electromagnet with an external power supply to drive the movable iron core (21) to move.

3. The in-situ filling strength testing device based on magnetic impact according to claim 1 is characterized in that: The indicating mechanism (3) comprises a base (31), a pointer shaft (32) and a measuring slide (33); the pointer shaft (32) is fixed to the housing (4) via the base (31), and the measuring slide (33) is sleeved on the pointer shaft (32) and slidably connected to the pointer shaft (32).

4. The in-situ filling strength testing device based on magnetic impact according to claim 3 is characterized in that: The pointer shaft (32) is arranged in parallel with the central guide rod (13); a spring sheet (34) is also provided on the pointer shaft (32); the spring sheet (34) is slidably connected to the pointer shaft (32) and is used to push the spring sheet (34) through the impact hammer (12) to indirectly push the measuring slide (33) to slide.

5. The in-situ filling strength testing device based on magnetic impact according to claim 1 is characterized in that: The housing is provided with a top cover (41) at the front end and a bottom cap (42) at the rear end; a through hole is provided on the top cover (41), and the striking rod (11) extends from the through hole.

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