CN209648329U - A kind of concrete core sample end face Plane surface grinding machine - Google Patents

Abstract

The utility model discloses a concrete core sample end surface grinding machine, which comprises a frame, a grinding disc, a grinding disc motion control component, and a sample clamping component, and the grinding disc is installed on the frame through the grinding disc motion control component. Thus, the end face of the sample installed on the sample holding assembly is ground; the sample holding assembly includes a sample holding base and a sample chuck; the upper end of the sample holding base is formed to be An arc-shaped groove adapted to the diameter of the sample for holding the sample, the sample chuck includes a compression piece and a compression rod, the compression piece is fixed on the compression rod, and It is installed above the arc groove together with the pressing rod, and the pressing rod has an operating arm for operating its rotation. When the pressing rod is rotated, the pressing member compresses or loosens the Specimen in an arc groove. The grinding machine sample is convenient and quick to install and dismantle, which can greatly improve work efficiency.

Description

A Concrete Core Sample End Surface Grinding Machine

technical field

The utility model relates to the technical field of concrete core sample detection, in particular to a concrete core sample end surface grinding machine.

Background technique

The core drilling method is one of the most important methods for testing the strength of solid concrete. However, the reliability and authenticity of the test results are affected by many factors, and the processing quality of core samples is the most prominent.

The processing quality of core samples usually includes factors such as aspect ratio, verticality, and flatness. For the control of the flatness of the end surface, when the surface of both ends of the core sample is uneven and does not meet the requirements of the specification, local compression or concentrated load will occur during the compression process of the specimen, which may cause the specimen to be damaged in advance, resulting in the test result being lower than the true strength. . For the control of verticality, when the non-perpendicularity between the end surface and the axis of the core sample is large, the specimen will not be able to ensure that the axial center is compressed and shear failure will occur, so that the test results cannot reflect the true strength of the specimen.

At present, the end face of the core sample is usually treated by mechanical grinding, which has high requirements on the performance of the grinding machine and the skills of the operator. The standard CECS03:2007 "Technical Regulations for Testing Concrete Strength by Core Drilling Method" requires that the unevenness of the end surface of the concrete core sample after processing is not greater than 0.1mm, and the non-perpendicularity between the end surface of the core sample specimen and the axis is not greater than 1°. At present, the concrete core sample grinding machines on the market have relatively large deficiencies in grinding quality and grinding efficiency, which are mainly manifested in:

(1) The installation, fastening, removal and sample replacement process of the sample is cumbersome and inefficient, and the installation and removal time accounts for more than 3/5 of the processing time, which greatly affects the test efficiency;

(2) The blade structure of the sharpening knife is unreasonable, the grinding ability is poor, and the smoothing efficiency is low, especially for samples with high strength and high hardness, it is difficult to smooth it or need to be polished for a long time;

(3) The equipment occupies a large area, has a lot of noise, a lot of dust, and a lot of water mist, which will cause great harm to the health of the test personnel;

(4) During the grinding process, due to the loose installation of the sample, the sample tends to swing laterally, making it difficult for the verticality to meet the specification requirements.

Utility model content

The purpose of the invention of the utility model is to provide a new type of concrete core sample end surface grinding machine which is convenient and fast for sample installation and removal, and can greatly improve work efficiency.

The purpose of the invention of the utility model is achieved through the following technical solutions: a concrete core sample end surface grinding machine, including a frame, a grinding disc, a grinding disc motion control assembly, and a sample clamping assembly, and the grinding disc is installed through the grinding disc motion control assembly on the rack, thereby grinding the end face of the sample mounted on the sample holding assembly;

It is characterized in that the sample clamping assembly includes a sample clamping base and a sample chuck;

The upper end of the sample clamping base forms an arc-shaped groove adapted to the diameter of the sample and used to hold the sample. The sample clamp includes a pressing piece and a pressing rod. The tightening part is fixed on the pressing rod, and is installed above the arc groove together with the rotation of the pressing rod. The pressing rod has an operating arm for operating its rotation, and the rotating described pressing rod , the pressing member compresses or loosens the sample in the arc-shaped groove.

The utility model realizes the stable fixation of the sample through the downward pressure of the sample chuck and the holding effect of the sample clamping base on the sample, so that the sample is not easy to swing laterally during the grinding process, and at the same time, it is Tighten and loosen the sample chuck with simple operation (the sample can be installed and removed by loosening the sample chuck), which can greatly save the time of sample installation and removal and improve work efficiency. The sample is placed on the sample holder base. It is recommended that the radian of the arc groove be 1/3-1/2 of the circumference of the sample (the sample is cylindrical).

The pressing member adopts an eccentric wheel or a pressing wheel whose distance from the axis center to the edge gradually increases within a certain range. The outer layer of the eccentric wheel or pressing wheel is recommended to be made of hard polyurethane material, which can Provides good friction and wear resistance.

When it is necessary to grind samples with different diameters, in order to facilitate replacement with an adapted sample holding base, the utility model makes the following improvements to the sample holding base:

The sample clamping base includes a sample clamp and a clamp support, the arc-shaped groove is formed on the upper end of the sample clamp, and there is no gap between the sample clamp and the clamp support through an adapted convex-concave structure. Fixed connections are assembled together.

As an optional embodiment of the present utility model: the clamp support is a U-shaped groove, the sample clamp is an arc-shaped piece, and the sample clamp straddles the clamp support.

There is no fixed connection between the sample fixture and the fixture support, and the sample fixture with different radians can be easily replaced according to the diameter of the sample.

The grinding machine also includes a linear moving platform, and the fixture support is fixed on the linear moving platform, so that when the sample is assembled, it can be kept away from the grinding disc, thereby improving the operational safety of the equipment.

The sample clamping assembly also includes a cantilever, the pressing member is rotatably mounted on one end of the cantilever through the pressing rod, the other end of the cantilever is a sleeve, and the cantilever is set on a cantilever through the sleeve. On the upright round rod, the upper and lower fixing rings are also sleeved on the round rod, the sleeve is located between the upper and lower fixing rings, and the upper and lower fixing rings are connected with thumb screws to realize position. The cantilever can move up and down along the round rod, and the upper and lower fixing rings are used to position the height of the cantilever without restricting the rotation of the cantilever.

There are also the following implementation methods to achieve the same effect:

The sample clamping assembly also includes a cantilever, the pressing member is rotatably mounted on one end of the cantilever through the pressing rod, the other end of the cantilever is rotatably mounted on a sleeve, and passes through the sleeve Installed on an upright round rod, the sleeve is connected with a thumb screw so as to achieve positioning between it and the round rod without restricting the rotation of the cantilever.

As the utility model improvement scheme:

The inner wall of the arc-shaped groove is axially provided with a concavo-convex structure for increasing the resistance of the sample to longitudinal displacement.

In order to solve the problems of unreasonable structure, poor grinding ability and low smoothing efficiency of existing grinding disc blades, especially for samples with high strength and high hardness, it is difficult to smooth them or need to be polished for a long time, the utility model proposes The solution is as follows:

The grinding disc is composed of a base plate and blades with bump-shaped structures distributed on the base plate according to a spiral. As a preference: there are more than two spirals, and a supplementary blade with a bump-shaped structure is added between adjacent spirals, and the supplementary blade is close to the outer edge of the chassis.

For the sake of safety, the grinding machine is also equipped with a protective cover for the grinding disc, and the protective cover for the grinding disc is set around the edge of the grinding disc to prevent human hands from touching the grinding disc, and at the same time accept the flying residue and sewage.

The grinder is also equipped with a water-cooling system, the water-cooling system includes a water inlet pipe and a drain pipe, the center of the grinding disc is provided with an opening as a cooling water outlet, and the water outlet of the water inlet pipe leads to the cooling water outlet, In order to water-cool the millstone, the water inlet of the drain pipe communicates with the bottom of the millstone protective cover so as to recover sewage.

The disc motion control assembly includes a base plate and a base plate rotating shaft, and the base plate is mounted on the frame through the rotation of the base plate rotating shaft. mounted on the substrate. The above-mentioned grinding disc motion control component can endow the grinding disc with two different motion forms: 1) self-propagation driven by the grinding disc rotating shaft; 2) swing along with the substrate, through the combination of the two motion forms, on the one hand, the working efficiency of the grinding disc can be further improved, On the other hand, the problem of local missing grinding caused by blade setting can be avoided.

In order to reduce noise, the drive structure uses a motor as a power source, and the motor is enclosed in a motor casing.

The water inlet pipe includes a water inlet hose with a larger diameter at the water inlet and a water inlet hard pipe with a smaller diameter at the water outlet, so as to increase the water pressure at the water outlet and help save water.

Compared with the prior art, the utility model has the following beneficial effects:

1) The utility model realizes the stable fixation of the sample through the downward pressure of the sample chuck and the holding effect of the sample clamping base on the sample, so that the sample is not easy to swing laterally during the grinding process, and at the same time A sample chuck with simple compression and loosening operations can greatly save the time for sample installation and removal and improve work efficiency. Even in the face of samples with different diameters, the utility model can quickly adapt to such changes by moving the sample chuck up and down and replacing the sample clamps. Therefore, the utility model can greatly improve the working efficiency of the smoothing machine, and about 60-70 pieces can be completed in one hour, which is far higher than the efficiency of 20 pieces per hour of the traditional smoothing machine, and the samples are fixed firmly during the smoothing process. , it is not easy to have the problem that the verticality is difficult to meet the specification requirements.

2) The grinding disc in the utility model adopts blades with a bump structure, and the blades are arranged in a spiral shape, which can significantly improve the grinding efficiency.

3) The grinding machine of the utility model has the advantages of small footprint, low operating noise, less dust and water mist, and safe operation.

Description of drawings

Fig. 1 is the front structural representation of the concrete core sample end surface grinder of the utility model embodiment one (omitting the grinding disc protective cover);

Fig. 2 is the right view of the concrete core sample end surface grinder of the utility model embodiment one;

Fig. 3 is the structural schematic diagram 1 of the sample holder of embodiment 1;

Fig. 4 is the structural schematic diagram 2 of the sample holder of embodiment 1;

Fig. 5 is the axial cross-sectional view of the sample fixture of embodiment one;

Fig. 6 is a schematic structural view of the grinding disc of the first embodiment.

Detailed ways

Embodiment one

The concrete core sample end surface grinding machine in the first embodiment includes a frame 1-1, which is made of stainless steel, has good corrosion resistance, can be stably placed on the laboratory floor, and is the main frame of the grinding machine. A power switch 1-6 is installed on the frame 1-1, which is used to control the start and stop of the whole grinding machine.

The sample installation area is set on the frame 1-1, and is mainly composed of a sample clamping component and a linear moving platform. The sample holding assembly includes a sample holding base and a sample chuck. The sample holding base is mainly used to hold the sample, and an arc-shaped groove matching the diameter of the sample is formed on the upper end. It is recommended that the radian of the arc groove be 1/3-1/2 of the sample circumference. The sample clamps 1-5 are used to press down the sample so that it is stably clamped between the sample clamping base and the sample clamps 1-5. In order to reduce the cumbersomeness of sample installation and fastening, removal and sample replacement, and improve work efficiency, the structures of the sample chucks 1-5 used in this embodiment are shown in Figures 3 and 4 .

The sample chuck 1-5 mainly includes a cantilever a1, a pressing piece a2 and a pressing rod a3. The pressing part a2 adopts an eccentric wheel, as shown in Figure 4, the outer layer of the eccentric wheel is made of hard polyurethane material, which can provide good friction and wear resistance. One end of the cantilever a1 is oppositely provided with two hinged ears, and the other end is a sleeve. The eccentric wheel is installed between the two hinge ears of the cantilever a1 through the pressing rod a2, and the eccentric wheel and the pressing rod a2 are driven through the key. The cantilever a1 is set on a round rod a4 erected on the sample holding base through its sleeve. The round rod a4 is also fitted with upper and lower fixing rings a5 and a6, and the sleeve is located on the upper and lower fixing rings a5 and a6. Between, the upper and lower fixing rings a5 and a6 are connected with thumb screws to realize positioning. The cantilever a1 can move up and down along the round rod a4, and the upper and lower fixing rings a5 and a6 are used to position the height of the cantilever a1, but do not limit the rotation of the cantilever a1.

The eccentric wheel is installed above the arc groove of the sample holding base. The compression rod a2 has an operating arm for operating its rotation. When the compression rod a2 is rotated, the eccentric wheel compresses or loosens the sample in the arc groove. Move the cantilever a1 up and down to adapt to the fixation of samples with different diameters. The rotatable design of the cantilever a1 can properly adjust the contact position between the eccentric wheel and the sample, and it is also convenient to move the eccentric wheel in the process of assembling the sample. open.

A similar effect can also be achieved by using a pressing wheel whose distance from the axis center to the edge gradually increases within a certain range for the pressing member.

The cooperating installation structure of the cantilever a1 and the round rod a4 is mainly used to realize the height adjustment of the cantilever a1 and the horizontal rotation after the height positioning. Its realization is not limited to the above-mentioned embodiment, as can also take the following implementation: the other end of the cantilever (the end used to be connected with the round rod) is rotatably mounted on a sleeve, and is installed on the aforementioned round rod through the sleeve, and the sleeve Thumb screws are connected to the barrel to realize the positioning between it and the round rod without restricting the rotation of the cantilever.

The utility model realizes the stable fixation of the sample through the downward pressure of the sample chuck and the holding effect of the sample clamping base on the sample, so that the sample is not easy to swing laterally during the grinding process, and at the same time, it is Tighten and loosen the sample chuck with simple operation (the sample can be installed and removed by loosening the sample chuck), which can greatly save the time of sample installation and removal and improve work efficiency.

In order to quickly replace the adapted sample holding base when grinding samples of different diameters, the sample holding base adopts a separate structure, specifically:

The sample clamping base includes sample clamps 1-3 and clamp supports 1-4. The fixture support 1-4 is a U-shaped groove, and the sample fixture 1-3 is an arc-shaped piece. The sample fixture 1-3 straddles the fixture support 1-4. In order to enhance stability, the rear end can pass through Ways such as adding baffle plate are offset with fixture support 1-4. The inner wall of the arc-shaped groove of the sample holder 1-3 is provided with a concave-convex structure along the axial direction to increase the resistance of the sample to produce longitudinal displacement, as shown in FIG. 5 .

In the utility model, there is no fixed connection between the sample clamp 1-3 and the clamp support 1-4, and the sample clamp 1-4 can be conveniently replaced according to the diameter of the sample, so that the sample clamp can be better gripped Hold the sample. The sample holder 1-3 and the holder support 1-4 can also be assembled together without fixed connection through other suitable convex-concave structures. For example, a groove is formed on the fixture support, and a suitable protrusion that can extend into the groove is just formed on the sample fixture, similar to connecting the two through a key, so as to enhance the stability of the connection between the two .

The fixture support 1-4 is installed on the linear moving platform, specifically on the linear bearing 2-2, and the linear bearing 2-2 is driven to move by shaking the handle 2-1, so that the fixture support 1-4 carries the sample to the grinding disc 1 -2 direction movement.

The grinding disc 1-2 is installed on the frame 1-1 through the grinding disc motion control assembly, so as to grind the end face of the sample installed on the sample holding assembly.

The diameter of the grinding disc 1-2 is about 18cm, as shown in Figure 6, it is composed of a chassis b1 and a blade b2 with a convex structure distributed on the chassis b1 according to a spiral, the thickness of the chassis is about 10mm, and the thickness of the blade b2 is 6-8mm. Made of powder alloy, mainly composed of iron and copper, cobalt, nickel and other alloying elements, and then welded on the chassis (45 steel). The three spirals are evenly distributed on the chassis b1, and two supplementary blades b3 in the shape of bumps are added between adjacent spirals, and the supplementary blades b3 are arranged close to the outer edge of the chassis b1. The thickness and material of the supplementary blade b3 are the same as those of the above-mentioned blade b2. Three fixing holes are evenly distributed on the grinding disc 1-2, so that the fixing of the grinding disc 1-2 can be realized by screws. A cooling water outlet is arranged in the center of the grinding disc 1-2, so as to water-cool the blade b2 during the grinding process, so as to prolong the life of the blade and reduce dust.

The above-mentioned grinding table with the blades spirally arranged is beneficial to slag discharge, drainage and cooling, and at the same time improves the grinding efficiency.

As shown in Figure 2, a disc protection cover 5 is provided around the edge of the grinding disc 1-2. In this embodiment, the disc protection cover 5 is fixed on the frame 1-1 to avoid manual contact with the grinding disc 1-2, and simultaneously Flying debris and sewage. The disc protection cover 5 can also be installed on the base plate 3 .

The grinding disc motion control assembly includes a base plate 3, a base plate rotating shaft 31, and the base plate 3 is mounted on the frame 1-1 through the rotation of the base rotating shaft 31, and also includes a grinding disc rotating shaft 33 installed on the base plate 3, a motor 34 and its operating rod 32, and a motor 34 The belt drive mechanism 35 is used to drive the substrate 3 to swing left and right around the substrate rotation shaft 33 . The above-mentioned motor 34 is enclosed in the motor housing to achieve noise reduction.

The above-mentioned grinding disc motion control assembly endows the grinding disc with two types of motion: 1) autobiography driven by the rotating shaft; 2) swinging around the base plate rotating shaft driven by the operating rod. The combination of the two motion forms can further improve the working efficiency of the grinding disc on the one hand, and on the other hand, can avoid the problem of partial missing grinding caused by the blade setting.

The cooling water system is made up of water inlet hose 2-7, water source switch 2-8, water inlet hard pipe 2-9, and drain hose 2-10. The water inlet hard pipe 2-9 is fixed on the millstone rotating shaft 33, and the front end stretches to the cooling water outlet of the millstone 1-2 center. The water inlet hose 2-7 diameter is greater than the water inlet hard pipe 2-9, so that the water pressure in the water inlet hard pipe 2-9 increases to save water. Water inlet hard pipe 2-9 is made of copper material, guarantees not to get rusty, not blocked. Drainage hose 2-10 is used for getting rid of the residue and sewage that are removed from grinding, and it communicates with the bottom of the grinding disc protection cover.

The working process of the above-mentioned grinding machine is as follows:

Sample installation

According to the diameter of the sample core sample, select the matching sample fixture, place the cut sample core sample in the appropriate position of the fixture, adjust the height of the upper and lower fixing rings, so that the eccentric wheel is just in line with the upper surface of the sample core sample When the middle part is in contact, turn the compression rod to compress and lock the sample on the fixture support. Shake the handle to move the sample towards the grinding disc until the end face of the sample is just in contact with the blade on the grinding disc.

grind flat

Turn on the water source switch, and properly adjust the water output and water output intensity. The tester stands at a suitable position on the right side of the grinding machine (Fig. 1), so that the right hand can conveniently operate the operating lever, and the left hand can conveniently operate the handle. Turn on the power of the grinder, and when the speed of the grinding disc is stable, shake the handle clockwise with the left hand to move the sample to the direction of the grinding disc. At the same time, operate the operating lever with the right hand to make the grinding disc reciprocate back and forth. The end face of each sample is roughly polished for 10 seconds, that is, the operating rod reciprocates back and forth about 10 times, and the grinding work of an end face can be completed. Then, turn the handle counterclockwise to move the sample away from the grinding disc. Then loosen and remove the sample, place the other end of the sample facing the grinding disc, and complete the grinding of the other end according to the above steps.

Claims (10)

1. a kind of concrete core sample end face Plane surface grinding machine, including rack, mill, mill motion control component, sample holder component, institute It states mill to be mounted on the rack by the mill motion control component, thus to being mounted on the sample holder component Sample end face ground；

It is characterized in that, the sample holder component includes sample holder pedestal and sample collet；

Sample holder pedestal upper end forms arc groove be adapted to the specimen finish, for holding the sample, institute Stating sample collet includes compressing member and compressor arm, and the compressing member is fixed on the compressor arm, and with the compressor arm It being rotatably installed in above the arc groove, the compressor arm has the motion arm for operating its rotation, the compressor arm is rotated, The compressing member compresses or loosens the sample in the arc groove.

2. Plane surface grinding machine according to claim 1, which is characterized in that the compressing member is using eccentric wheel or in some range The contact roller that the distance at inner axes to edge is gradually increased.

3. Plane surface grinding machine according to claim 1, which is characterized in that the sample holder pedestal includes specimen holder and fixture Support, the arc groove are formed in the specimen holder upper end, pass through between the specimen holder and the clamp mount and be adapted to Convex-concave structure be assembled together without what is be fixedly connected.

4. Plane surface grinding machine according to claim 3, which is characterized in that the clamp mount is a U-type groove, the specimen holder For a camber part, the specimen holder is across on the clamp mount.

5. Plane surface grinding machine according to claim 1, which is characterized in that the Plane surface grinding machine further includes linear movement platform, described Sample holder pedestal is fixed on the linear movement platform.

6. Plane surface grinding machine according to claim 1, which is characterized in that the sample holder component further includes cantilever, the pressure Tight part is rotatably installed in one end of the cantilever by the compressor arm, and the other end of the cantilever is a sleeve, and cantilever passes through The sleeve is sleeved on the round bar of a setting, is further sleeved with upper and lower retainer plate on the round bar, the sleeve be located at it is described it is upper, Between lower retainer plate, hand the turn of the screw is connected on the upper and lower retainer plate to realize positioning；Or

The sample holder component further includes cantilever, and the compressing member is rotatably installed in the one of the cantilever by the compressor arm End, the other end of the cantilever is rotatably installed on a sleeve, and is mounted on the round bar of a setting by the sleeve, the set Hand the turn of the screw is connected on cylinder to realize rotation of its positioning between round bar without limiting the cantilever.

7. Plane surface grinding machine according to claim 1, which is characterized in that the mill is distributed in the bottom by chassis and according to helical The blade of convex block structure on disk is constituted.

8. Plane surface grinding machine according to claim 1, which is characterized in that the Plane surface grinding machine is also configured with mill protective cover, described Mill protective cover collar the mill edge setting.

9. Plane surface grinding machine according to claim 8, which is characterized in that the Plane surface grinding machine is also configured with water-cooling system, the water Cooling system includes water inlet pipe and drainpipe, and the mill center is equipped with an aperture as cooling water outlet, and the water inlet pipe goes out Lead to the cooling water outlet at the mouth of a river, and the water inlet of the drainpipe is connected to mill protective cover bottom.

10. Plane surface grinding machine according to claim 1, which is characterized in that the mill motion control component includes substrate, substrate Shaft, the substrate are rotatably installed in the rack by the substrate shaft, and the mill motion control component further includes Mill shaft and the driving mechanism of driving mill shaft rotation, they are respectively mounted on the substrate.