CN110579373B - A portable concrete surface precision grinding sampling device - Google Patents

Abstract

The invention discloses portable concrete surface accurate grinding sampling equipment, which belongs to the field of concrete durability monitoring, wherein a grinding head and a drill bit are sequentially arranged on a sampling mechanism from front to back, the grinding head and the drill bit are connected into an integrated structure, and the drill bit is connected with a motor rotating shaft through a drill bit mounting seat; the screw thread cylinder of the accurate adjusting mechanism is arranged at the outer side part of the drill bit mounting seat, the inner wall of the fixed ruler is provided with an internal thread matched with the screw thread cylinder, and the fixed ruler and the screw thread cylinder relatively rotate to adjust the relative depth of the grinding head embedded into the sampling layer; the two ends of the sliding rail of the collecting mechanism are fixedly connected with the drill bit mounting seat, and the powder collecting groove is movably sleeved on the sliding rail to cover the grinding head therein. The concrete powder sampling device solves the problems that the existing concrete powder sampling device is inconvenient to carry, the sampling process is complex in operation, the sampling demand can not be accurately controlled, dust pollution and the like in the sampling process, and has the characteristics of accurate sampling, simplicity in operation and convenience in carrying. The device can be used for outdoor in-situ sampling and also can be used for indoor sampling.

Description

A portable concrete surface precision grinding sampling device

Technical Field

The invention belongs to the technical field of concrete sampling equipment, and in particular relates to a portable concrete surface precise grinding sampling equipment.

Background Art

Since concrete is a porous, hydrophilic material, it is easily penetrated by water. Harmful substances in the external environment, such as chloride ions, sulfates, and carbon dioxide, enter the interior of concrete through water. Harmful substances in the external environment either change the microenvironment inside the concrete to affect the steel passivation film, or directly accelerate the corrosion of steel bars, resulting in reduced durability of concrete and a service life that does not reach the designed service life. At present, building structures at home and abroad are facing serious durability problems, causing huge economic losses. Since the late 1970s, many existing infrastructures in developed countries have gradually shown signs of premature deterioration. For example, the total value of concrete in the United States in the 1990s was 6 trillion US dollars, and the cost of maintenance and reconstruction reached as much as 300 billion US dollars per year. According to statistics, seaport projects built before the 1990s in my country generally suffer from severe steel corrosion after 10-20 years of use. In recent years, some newly built seaport terminals have suffered from severe steel corrosion within less than 10 years of service, even if durability measures have been taken. Detecting the penetration of harmful substances from the outside world in the concrete surface can effectively evaluate and predict the durability of concrete, so as to take corresponding protective measures. For existing buildings and structures, it is impossible to bury sensors, so the durability testing of existing buildings and structures is usually done by sampling. The testing methods and methods for chloride ions, sulfates, and carbon dioxide are relatively mature, but basically require powder samples. The general process includes: on-site drilling sampling, test block grinding, and related component testing.

Common concrete powder sampling equipment is carefully designed in terms of accuracy and operation, but the equipment is often bulky and difficult to transport if there are many samples. For example, the patent <A method and device for obtaining layered samples for concrete deterioration detection> includes machine tools, grinders, fixtures and powder collection devices, which are not suitable for outdoor environment operations and have strict requirements on the size and shape of the test blocks.

Patent <A handheld high-precision concrete drilling powder sampling device and sampling method>, when sampling outdoors through the method described in it, it is necessary to install a matching clamping device. For sampling locations that are not suitable for installing holding tools, the device is inconvenient to use. In addition, the device cannot collect powder, and powder flies during the drilling process, which is harmful to the health of the operator. At the same time, it is not suitable for outdoor operations in strong winds. Therefore, how to develop a portable concrete surface precision grinding sampling device is of great practical significance.

Summary of the invention

In view of the technical problems in the prior art that the equipment is bulky and cannot meet the requirements of accurate control of sampling volume, the purpose of the present invention is to provide a portable concrete surface accurate grinding sampling equipment.

The technical solution adopted by the present invention is:

A portable concrete surface precision grinding sampling device, comprising a sampling mechanism, a precision adjustment mechanism and a collection mechanism.

The sampling mechanism is provided with a grinding head and a drill bit in sequence from front to back, the grinding head and the drill bit are connected as an integrated structure, and the drill bit is connected to the motor shaft through a drill bit mounting seat;

The precise adjustment mechanism includes a threaded barrel and a fixed ruler. The threaded barrel is arranged on the outer side of the drill bit mounting seat. The inner wall of the fixed ruler is provided with an internal thread matched with the threaded barrel. The fixed ruler and the threaded barrel are relatively rotated to adjust the relative depth of the grinding head embedded in the sampling layer.

The collecting mechanism comprises a powder collecting trough and a slide rail. The two ends of the slide rail are fixedly connected to the drill bit mounting seat. The powder collecting trough is movably sleeved on the slide rail to cover the grinding head.

Furthermore, the threaded barrel and the fixed ruler are both configured as cylindrical structures, and the outer wall of the threaded barrel and the inner wall of the fixed ruler are respectively provided with external threads and internal threads.

Furthermore, the thread pitch between the threaded barrel and the fixed ruler is 0.5 mm, the total length is 30 mm, the fixed ruler and the threaded barrel rotate relative to each other, and the grinding head advances 0.5 mm for each rotation.

The grinding feed amount is controlled below 0.5mm each time, which provides accurate data for studying the concentration and gradient of corrosive media entering the concrete, avoids human errors caused by slicing and solving the problem of complex specific operations.

High precision and good repeatability. In the conventional sampling mechanism in the prior art, the sampling depth is only observed by naked eyes, the sampling depth cannot be accurately controlled, and the sampling layers interfere with each other, the outer layer sampling powder easily enters the inner layer, and the sampling repeatability is poor. The present invention can accurately control the concrete sampling depth through the cooperation of the threaded barrel and the fixed ruler, so as to achieve high-precision sampling, and the error is designed to be less than 10μm. The depth of sampling can be accurately known through the scale on the fixed ruler, and the accuracy is high; the surface powder after sampling is collected in time through the powder collection groove, which can avoid interference between the sampling layers and has good repeatability.

Furthermore, the grinding head is configured as a hollow diamond grinding head, the grinding head is configured as a structure formed by concentric arrangement of inner annular grinding teeth and outer annular grinding teeth, and the center position of the grinding head is separated by a dumbbell-shaped grinding stone to form two symmetrical arc-shaped hollow holes I, the center of the dumbbell-shaped grinding stone protrudes outward and extends to be provided with a conical tip, a circle of hollow holes II is provided at the outer edge of the inner annular grinding teeth, and adjacent hollow holes II are arranged at equal intervals. The hollow holes I and the hollow holes II cooperate with each other to facilitate advancement into the sampling layer, and the special structure of the conical tip can reduce the friction resistance between it and the sampling layer, greatly improving the drilling rate.

Furthermore, the inner annular grinding teeth and the outer annular grinding teeth are both configured as arc-shaped racks which are narrow inside and wide outside, adjacent arc-shaped racks are arranged at equal intervals, and the tooth spacing of the inner annular grinding teeth is smaller than the tooth spacing of the outer annular grinding teeth.

The arc-shaped rack structure can generate shear force in criss-cross directions, which can effectively increase the contact area per unit area; the structure in which the inner annular grinding teeth and the outer annular grinding teeth cooperate with each other is conducive to overcoming friction resistance when going deep into the sampling layer, and the sampling can quickly meet the sampling quantity requirements.

Furthermore, the powder collecting trough is configured as a hollow cavity structure adapted to the grinding head, which is movably mounted on a slide rail, and the lower end of the cover is connected to a powder collecting box through a pipe, and the powder collecting box is connected to a turbine, and the powder is collected by the wind pressure generated by the turbine.

The powder collection box is configured as a box with a hollow collection cavity, and a drawer is disposed at the bottom thereof.

Furthermore, the powder collection trough includes a cover shell and a powder collection bag. A collection port adapted to the grinding head is arranged on the left side of the upper part of the cover shell. The lower part of the cover shell is arranged as a funnel structure. The powder collection bag is located below the funnel and is connected to the funnel.

Furthermore, the powder collecting capsule is a hollow spherical structure made of rubber material. The powder collecting capsule has a certain elasticity, and the change of air pressure can be used to promote the rapid collection of powder by squeezing.

Furthermore, the powder collecting trough moves left and right along the slide rail, and the moving distance of the powder collecting trough is constrained by a fixed ruler. The moving distance of the powder collecting trough along the slide rail is consistent with the distance that the grinding head penetrates into the sampling layer, which can ensure that the sampled powder is completely collected in the powder collecting trough. At the same time, the fixed ruler forms a certain limit to its maximum moving distance, which can ensure accurate positioning and control of the maximum sampling depth.

Furthermore, the grinding head is configured as a detachable structure, and when it is installed, it is used for grinding and sampling; when it is removed, it is used for drilling.

Furthermore, a hand-held handle is provided at the end of the electric drill body, and an electric drill switch is provided on the hand-held handle. The hand-held handle is convenient to hold, and the sampling operation is convenient and quick by pressing the electric drill switch.

The beneficial effects of the present invention are:

The sampling mechanism of the present invention adopts a hollow diamond grinding head with good wear resistance and novel structural design. It can quickly penetrate the surface of the sampling layer for sampling, has uniform force and a large contact area with the sampling layer, overcomes friction resistance, and can meet the needs of large sampling volume.

The threaded barrel and fixed ruler of the precise adjustment mechanism rotate relative to each other, which can accurately control the sampling depth of concrete drilling powder, and can achieve high-precision spacing for powder collection with small error. In addition, the two have simple structures, convenient and fast processing, and good sampling repeatability.

The powder collection trough of the collection mechanism has a novel structure and has the dual technical effects of collecting powder and preventing dust. It ensures the rapid collection of sampled powder while improving the environmental friendliness of the sampling environment. It cooperates with the slide rail to ensure that it is consistent with the displacement of the grinding head and the operating error is small.

The overall structure is compact and easy to operate. It can meet the test needs of different engineering sites. It is easy to carry and the operation process is environmentally friendly. It has broad market application prospects.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 is a schematic diagram of the overall structure of the present invention;

Fig. 2 is a front view of the present invention;

FIG3 is a schematic diagram of the front structure of the present invention;

FIG4 is a schematic diagram of the structure of the connection between the powder collection box and the turbine in the present invention;

FIG5 is a schematic diagram of the structure of a powder collecting tank with a powder collecting capsule in the present invention;

FIG6 is a schematic diagram of the structure of a hollow diamond grinding head in the present invention;

FIG7 is a front view of the hollow diamond grinding head of the present invention;

In the figure: 1. grinding head; 2. powder collecting groove; 2-1. funnel; 2-2. cover; 3. drill bit; 4. threaded barrel; 5. fixed ruler; 6. slide rail; 7. powder collecting bag; 8. hand handle; 9. inner ring grinding teeth; 10. outer ring grinding teeth; 11. hollow hole I; 12. hollow hole II; 13. dumbbell-shaped grinding stone; 14. powder collecting box; 15. turbine.

DETAILED DESCRIPTION

The present invention is further described below in conjunction with the accompanying drawings.

Example 1

As shown in Figures 1 to 5, a portable concrete surface precision grinding sampling device includes a sampling mechanism, a precision adjustment mechanism and a collection mechanism.

The sampling mechanism is provided with a grinding head and an electric drill body from front to back in sequence. The electric drill body includes a drill bit and a drill bit mounting seat. The grinding head and the drill bit are connected as an integrated structure. The drill bit is connected to the motor shaft through the drill bit mounting seat. The electric drill is a commonly used rechargeable industrial electric drill. The grinding head is installed at the free end of the drill bit.

The precise adjustment mechanism includes a threaded barrel and a fixed ruler. The threaded barrel is arranged on the outer side of the drill bit mounting seat. The inner wall of the fixed ruler is provided with an internal thread matched with the threaded barrel. The threaded barrel and the fixed ruler are both arranged as cylindrical barrel structures. The outer wall of the threaded barrel and the inner wall of the fixed ruler are respectively provided with an external thread and an internal thread. The thread pitch on the threaded barrel and the fixed ruler is 0.5 mm, and the total length is 30 mm. The fixed ruler and the threaded barrel rotate relative to each other. The grinding head advances 0.5 mm for each rotation. The fixed ruler and the threaded barrel rotate relative to each other to adjust the relative depth of the grinding head embedded in the sampling layer.

The collecting mechanism comprises a powder collecting trough and a slide rail. Both ends of the slide rail are fixedly connected to the drill mounting seat. The connection method between the two ends of the slide rail and the drill mounting seat is welding. The powder collecting trough is movably mounted on the slide rail to cover the grinding head.

The powder collection tank is configured as a hollow cavity structure adapted to the grinding head, which is movably mounted on a slide rail, the lower end of the cover is connected to a powder collection box through a pipeline, the powder collection box is connected to a turbine, and the powder is collected by the wind pressure generated by the turbine. The powder collection box is configured as a box with a hollow collection cavity, and a drawer is provided at the bottom.

A hand-held handle is arranged at the end of the electric drill body, and an electric drill switch is arranged on the hand-held handle.

The specific test method is as follows:

Hold the handle, select the concrete sampling surface, align the powder collection tank with the concrete surface, and adjust the fixed ruler to the far left. At this time, the diamond grinding head is in close contact with the concrete sampling surface. Rotate the fixed ruler to make the fixed ruler retreat a certain distance, thereby allowing the diamond grinding head to move forward the same distance. Turn on the power, turn on the electric drill switch on the handle, the motor shaft rotates to drive the electric drill to rotate, and the electric drill drives the diamond grinding head to rotate. Simultaneously push the diamond grinding head forward by hand and go deep into the sampling layer. At the same time, the powder collection tank moves to the right along the slide rail, and the collection port of the cover of the powder collection tank is always in close contact with the sampling surface. The turbine runs, and the powder is collected by the wind pressure generated by the turbine, that is, the powder sampled by the grinding head enters the powder collection box along the pipeline. When the powder collection is completed, open the drawer and process the collected powder uniformly.

The portable concrete surface precise grinding sampling device of the present invention solves the problems that the existing concrete powder sampling device is not easy to carry, the sampling process is complicated to operate, and the sampling demand cannot be accurately controlled. The concrete surface precise grinding sampling device of the present invention has the characteristics of precise sampling, simple operation, and convenient carrying. It can be used for outdoor in-situ sampling and indoor sampling.

Example 2

On the basis of Example 1, different from Example 1, as shown in Figures 6 and 7, the grinding head is configured as a hollow diamond grinding head, the hollow diamond grinding head is a detachable grinding head, and a hollow hole I is arranged in the center of the grinding head. More specifically, two symmetrical arc hollow holes I are formed at the center of the grinding head through a dumbbell-shaped grindstone, the center of the dumbbell-shaped grindstone protrudes outward and is provided with a conical tip, a circle of hollow holes II is provided at the outer edge of the inner annular grinding teeth, the center of the dumbbell-shaped grindstone protrudes outward and is provided with a conical tip, the hollow diamond grinding head is configured as a structure formed by concentric arrangement of inner annular grinding teeth and outer annular grinding teeth, and the radius of the outer annular grinding teeth is 20-30mm; the hollow holes I and the hollow holes II cooperate with each other to facilitate advancement into the sampling layer, and the special structure of the conical tip can reduce the friction resistance between it and the sampling layer, thereby greatly improving the drilling rate.

The inner annular grinding teeth and the outer annular grinding teeth are both configured as arc-shaped racks which are narrow inside and wide outside, adjacent arc-shaped racks are arranged at equal intervals, and the tooth spacing of the inner annular grinding teeth is smaller than the tooth spacing of the outer annular grinding teeth.

The surface of the ordinary grinding head in the prior art is a sand surface structure, and the sampling is performed by friction between the grinding head and the sampling layer, but it is unable to penetrate into the interior of the sampling layer, and therefore the sampling quantity requirement cannot be met; in actual operation, it is necessary to detect the penetration of harmful substances from the outside into the concrete surface, and the sampling quantity of the grinding head is extremely important. The hollow diamond grinding head in the present application can ensure that the contact area between the grinding head and the sampling layer is large when the grinding head penetrates into the sampling layer, and effectively avoids the problem of too large resistance and inability to penetrate into the interior, as well as the problem of too fast friction heating.

Example 3

On the basis of Example 1, different from Example 1, as shown in FIG4 , the grinding head is configured as a detachable structure, and the grinding head is removed from the end of the equipment for drilling.

A portable drilling device comprises a drilling mechanism, a precision adjustment mechanism and a collection mechanism.

The drilling mechanism is provided with an electric drill body and a hand-held handle from front to back in sequence. The electric drill body includes a drill bit and a drill bit mounting seat, and the drill bit is connected to the motor shaft through the drill bit mounting seat; a hand-held handle is provided at the end of the electric drill body, and an electric drill switch is provided on the hand-held handle.

The precise adjustment mechanism includes a threaded barrel and a fixed ruler. The threaded barrel is arranged on the outer side of the drill bit mounting seat. The inner wall of the fixed ruler is provided with an internal thread matched with the threaded barrel. The threaded barrel and the fixed ruler are both arranged as cylindrical barrel structures. The outer wall of the threaded barrel and the inner wall of the fixed ruler are provided with an external thread and an internal thread respectively. The thread pitch on the threaded barrel and the fixed ruler is 0.5 mm, and the total length is 30 mm. The fixed ruler and the threaded barrel rotate relative to each other. The drill bit advances 0.5 mm for each rotation. The fixed ruler and the threaded barrel rotate relative to each other to adjust the relative depth of the drill bit embedded in the drilling layer.

The collecting mechanism comprises a powder collecting trough and a slide rail, both ends of the slide rail are fixedly connected to a drill bit mounting seat, and the powder collecting trough is movably sleeved on the slide rail to cover the drill bit therein.

The powder collecting tank includes a cover shell and a powder collecting bag. A collecting port adapted to the grinding head is arranged on the left side of the upper part of the cover shell. The lower part of the cover shell is arranged as a funnel structure. The powder collecting bag is located below the funnel and is connected to the funnel.

The powder collecting capsule is a hollow spherical structure made of rubber material. The powder collecting trough moves left and right along the slide rail, and the moving distance of the powder collecting trough is constrained by a fixed ruler.

The specific drilling method is as follows:

Hold the handle, select the concrete sampling surface, align the powder collection slot with the concrete surface, and adjust the fixed ruler to the far left. At this time, the end of the drill bit is in close contact with the concrete sampling surface. Rotate the fixed ruler to make the fixed ruler retreat a certain distance, and then allow the drill bit to move forward the same distance. Turn on the power, turn on the electric drill switch on the handle, the motor shaft rotates to drive the electric drill to rotate, and the electric drill drives the drill bit to rotate. Simultaneously push the drill bit forward by hand and go deep into the perforated wall. At the same time, the powder collection slot moves to the right along the slide rail, and the collection port of the cover of the powder collection slot is always in close contact with the sampling surface. The dust passing through the drilling is covered by the cover and falls into the powder collection bag along the funnel, ensuring the environmental protection of the drilling environment.

The above is only a preferred embodiment of the present invention, and does not limit the present invention in other forms. Any technician familiar with the profession may use the above disclosed technical content to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the technical solution of the present invention still belongs to the protection scope of the technical solution of the present invention.

Claims (6)

1. A portable concrete surface precision grinding sampling device, characterized in that it includes a sampling mechanism, a precision adjustment mechanism and a collection mechanism, The sampling mechanism is provided with a grinding head and a drill bit in sequence from front to back, the grinding head and the drill bit are connected as an integrated structure, and the drill bit is connected to the motor shaft through a drill bit mounting seat; The precise adjustment mechanism includes a threaded barrel and a fixed ruler. The threaded barrel is arranged on the outer side of the drill bit mounting seat. The inner wall of the fixed ruler is provided with an internal thread matched with the threaded barrel. The fixed ruler and the threaded barrel are relatively rotated to adjust the relative depth of the grinding head embedded in the sampling layer. The collecting mechanism includes a powder collecting trough and a slide rail, both ends of the slide rail are fixedly connected to the drill bit mounting seat, and the powder collecting trough is movably sleeved on the slide rail to cover the grinding head therein; The grinding head is configured as a hollow diamond grinding head, and the grinding head is configured as a structure formed by concentric arrangement of inner annular grinding teeth and outer annular grinding teeth, and two symmetrical arc-shaped hollow holes I are formed at the center of the grinding head through a dumbbell-shaped grinding stone, and a conical tip is provided at the center of the dumbbell-shaped grinding stone protruding outward, and a circle of hollow holes II is provided at the outer edge of the inner annular grinding teeth; The inner annular grinding teeth and the outer annular grinding teeth are both configured as arc-shaped racks that are narrow inside and wide outside, and adjacent arc-shaped racks are arranged at equal intervals, and the tooth spacing of the inner annular grinding teeth is smaller than the tooth spacing of the outer annular grinding teeth; The threaded barrel and the fixed ruler are both arranged as cylindrical bodies, and the outer wall of the threaded barrel and the inner wall of the fixed ruler are arranged with external threads and internal threads respectively. 2. A portable concrete surface precision grinding sampling device according to claim 1, characterized in that the thread pitch between the threaded barrel and the fixed ruler is 0.5 mm, the total length is 30 mm, the fixed ruler and the threaded barrel rotate relative to each other, and the grinding head advances 0.5 mm for each rotation. 3. A portable concrete surface precision grinding sampling device according to claim 1, characterized in that the powder collection tank is configured as a hollow cavity structure adapted to the grinding head, which is movably mounted on a slide rail, and the lower end of the cover is connected to a powder collection box through a pipe, and the powder collection box is connected to a turbine, and powder is collected by the wind pressure generated by the turbine. 4. According to claim 1, a portable concrete surface precision grinding sampling device is characterized in that the powder collection tank includes a cover shell and a powder collection bag, a collection port adapted to the grinding head is arranged on the left side of the upper part of the cover shell, the lower part of the cover shell is arranged as a funnel structure, the powder collection bag is located below the funnel and is connected to the funnel; the powder collection bag is a hollow spherical structure made of rubber material. 5. A portable concrete surface precision grinding sampling device according to claim 3 or 4, characterized in that the powder collecting trough moves left and right along the slide rail, and the moving distance of the powder collecting trough is constrained by a fixed ruler. 6. A portable concrete surface precision grinding sampling device according to claim 1, characterized in that the grinding head is configured as a detachable structure, which is used for grinding sampling when installed and for drilling when removed.