Self-adaptive pressing device for coring of concrete body

Abstract

The utility model discloses a concrete body coring self-adaptive downward pressing device which comprises a rack and a self-adaptive downward pressing cutting mechanism installed on the rack and used for conducting cutting coring on a concrete body, and the self-adaptive downward pressing cutting mechanism comprises a self-adaptive downward pressing unit and a concrete body cutting unit; the self-adaptive downward pressing unit comprises a sliding support arranged on the machine frame in a sliding mode, at least one pneumatic telescopic rod used for pushing the sliding support to do linear reciprocating sliding motion is arranged between the sliding support and the machine frame, and the pneumatic telescopic rod is communicated with a constant-pressure air source through an air supply pipe. According to the utility model, the constant-pressure air source is adopted to continuously and stably provide downward pressure for the hollow drill, so that the hollow drill can continuously cut a concrete body at a uniform rotating speed and a linear feed rate, a concrete body test piece with good surface quality is obtained, and the conditions of tooth breaking and jamming of a drill bit caused by non-uniform or overlarge feed rate are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of concrete body detection, in particular to the technical field of sample preparation for concrete body detection, specifically to the technical field of coring devices for concrete body samples, specifically to an adaptive downward pressure device for coring concrete body samples. Background Art

[0002] Concrete coring is an essential process for the preparation of the concrete body / concrete specimens to be tested during the strength test of concrete structures. Drilling and coring operations are required according to CECS03:2007 "Technical Specifications for Testing Concrete Strength by Core Drilling Method", GB11818-89 "Technical Requirements for Concrete Drilling and Coring Machines" and GB50204-2002 "Concrete Structure Engineering Construction Quality Acceptance Code". The devices / equipment used in the actual coring process of concrete bodies are not uniform. Generally, manual pressure drilling and coring operations are used. The pressure and drilling volume are adjusted subjectively according to the load changes of the equipment. As one of the representatives of existing concrete coring devices, please refer to the article "Correct Use of Concrete Coring Drill" published on the Internet by the official account of Nanjing Nandi Drilling Machinery Co., Ltd. on September 8, 2022. The concrete coring equipment disclosed in the article adopts typical mechanical downward pressure, and uses a thread to drive the drill bit to drill into the concrete body. The advantages of this downward pressure method are simple equipment, high reliability, and easy operation; of course, there are also structural disadvantages, that is, high requirements for operators. Since the concrete body is a rigid structure, and the downward pressure thread is also a purely mechanical structure, no matter how much it rotates, there will always be a momentary feed amount. At this moment, the load on the tool and the drive mechanism will increase sharply, and the wear damage to the tool is relatively large. It needs to withstand the stress of concrete cutting instantly, which is easy to break the drill bit teeth. The best state for coring cutting of concrete is to feed the tool at a uniform speed, so that the concrete body can form a very neat sample side wall during the cutting process, avoiding the local stress concentration of the sample due to scratches on the inner wall of the sample and destroying the entire sample compression test. Utility Model Content

[0003] In order to more accurately and objectively test the strength of concrete / concrete body, as an indicator for judging the strength of existing prefabricated box girders, for example, existing highway viaduct box girders, railway viaduct box girders, bridge pier concrete body strength testing, etc. The object of concrete body strength testing is the concrete body specimen, and the preparation of the concrete body specimen is obtained by physical cutting in the complete concrete body. Concrete body specimens with good surface quality are the prerequisite for obtaining accurate experimental data. In order to obtain a smooth surface of the concrete body specimen and avoid the problem of uneven downward pressure feed or excessive downward pressure feed causing scratches on the circumferential side wall of the specimen or damage to the hollow drill bit, the present application provides a concrete body coring adaptive downward pressure device. Compared with the existing mechanical downward pressure, it will not cause the instantaneous feed amount to increase, causing the driving mechanism to increase sharply, and the cutter teeth to cause scratches on the circumferential side wall of the concrete body specimen.

[0004] In order to improve the cutting state of concrete coring and enhance the cutting uniformity and linearity of the cutting feed amount during the coring process, the present application changes the existing manual pressure mechanism into a constant pressure mechanism, so that during the entire concrete coring process, the downward pressure borne by the tool cutting remains the same. In this way, the concrete body can be cut evenly at a uniform speed to obtain a concrete specimen with a smooth circumferential side wall.

[0005] In order to achieve the above purpose, the technical solution adopted in this application is:

[0006] An adaptive downward pressure device for coring a concrete body, comprising a frame, an adaptive downward pressure cutting mechanism mounted on the frame for cutting and coring a concrete body, wherein the adaptive downward pressure cutting mechanism comprises an adaptive downward pressure unit and a concrete body cutting unit;

[0007] The adaptive downward pressing unit comprises a sliding bracket slidably arranged on the frame, at least one pneumatic telescopic rod is arranged between the sliding bracket and the frame for pushing the sliding bracket to perform linear reciprocating sliding motion, and the pneumatic telescopic rod is connected to a constant pressure air source through an air supply pipe;

[0008] The concrete cutting unit includes a first motor mounted on a sliding bracket, the output shaft of the first motor passes through the sliding bracket and is coaxially connected to a hollow drill. A support platform for fixing the concrete body is also fixedly arranged on the frame, and the support platform is arranged directly below the hollow drill.

[0009] As one of the preferred schemes of the present application, the adaptive downward pressure unit also includes guide rails vertically arranged at both ends of the support platform, and both ends of the sliding bracket are fixedly connected with rings slidably mounted on the guide rails, and two pneumatic telescopic rods are symmetrically arranged between the two sides of the upper end surface of the sliding bracket and the frame, and any pneumatic telescopic rod is connected to the constant pressure air source through the air supply pipe.

[0010] Furthermore, the constant pressure gas source includes the gas supply pipe, the gas tank and the air pump which are connected in sequence, the air pump is drivingly connected to the second motor, and the second motor is controlled by a gas pressure switch which is arranged on the gas tank and is controlled by the gas pressure inside the gas tank.

[0011] As one of the options for conventional constant pressure air source, in order to reduce costs and improve convenience, the practical constant pressure air source is an adjustable pressure air compressor, such as an ordinary air compressor available on the market, but the maximum pressure that the air compressor can provide should not be lower than the minimum pressure requirement of the actual application scenario.

[0012] In order to realize the whole-body cutting of the concrete body, the support platform is provided with an avoidance hole for avoiding the hollow drill, so that the whole concrete body can be completely cut to obtain a complete concrete body specimen without knocking, thus avoiding the problem of surface damage of the concrete body specimen.

[0013] In order to further obtain concrete specimens with good surface quality, it also includes a spray mechanism, which includes a water tank fixedly installed on the frame, and the water tank is connected to a spray water tank arranged on the sliding bracket through a water supply pipe. A plurality of nozzles for spraying water are distributed in a circular array at the lower part of the spray water tank, and the nozzles of the nozzles are oriented toward the center of the circular array. The spray water tank has a through hole for avoiding the hollow drill.

[0014] In order to better cool the hollow drill and facilitate slag removal, preferably, the water supply pipe is also provided with a pump for pressurizing the water flow in the nozzle.

[0015] Beneficial effects:

[0016] 1. The utility model adopts a constant pressure air source to continuously and stably provide downward pressure to the hollow drill, so that the hollow drill can continuously cut the concrete body at a uniform rotation speed and linear feed rate, thereby obtaining a concrete body specimen with good surface quality, avoiding the drill bit from being hit or stuck due to uneven or excessive feed rate.

[0017] 2. The utility model arranges a plurality of nozzles around the hollow drill, so that in the process of cutting the concrete body, there is always water flowing through the hollow drill to the cutting area, which can not only cool the hollow drill to avoid damage to the hollow drill due to excessive temperature during the cutting process, but also effectively take away the concrete debris generated by the cutting to avoid accumulation in the cutting groove to scratch the surface of the hollow drill and the concrete specimen. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative labor.

[0019] Figure 1 It is the axonometric drawing of the structure of the utility model.

[0020] Figure 2 It is another visual structure axonometric drawing of the utility model.

[0021] Figure 3 yes Figure 1 main view.

[0022] In the figure: 1-frame; 2-water storage tank; 3-pump; 4-water supply pipe; 5-sliding bracket; 6-spray water tank; 7-first motor; 8-hollow drill; 9-guide rail; 10-support platform; 11-avoidance hole; 12-pneumatic telescopic rod; 13-air supply pipe; 14-air storage tank; 15-air pump; 16-second motor; 17-nozzle. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0025] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0026] In the description of this application, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the product of the application is usually placed when in use. It is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on this application. In addition, if the terms "first", "second", etc. appear in the description of this application, they are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0027] In addition, if the terms "horizontal" or "vertical" appear in the description of this application, it does not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0028] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0029] Preferred embodiment:

[0030] This application is aimed at improving the device for coring concrete, mainly focusing on how to evenly apply downward pressure to the hollow drill so that the hollow drill can always maintain uniform and linear cutting during the cutting of the concrete body, thereby obtaining a concrete body specimen with good surface quality and no obvious scratches or missing parts. Since the device provided by this application is a simple mechanical device, the preferred embodiment of this application is fully described below. Figure 1-Figure 3 The shown embodiment is an adaptive downward pressure device for coring concrete, comprising a frame 1, an adaptive downward pressure cutting mechanism installed on the frame 1 for cutting and coring concrete, wherein the adaptive downward pressure cutting mechanism comprises an adaptive downward pressure unit and a concrete cutting unit; the function of the concrete cutting unit is to cut out a concrete specimen of a specified model and diameter from the concrete body to be tested using a hollow drill 8 according to the test requirements, and the adaptive downward pressure unit is a mechanism for applying the positive pressure required for cutting to the concrete cutting unit, so that the cutting work can be carried out evenly, linearly and continuously.

[0031] The adaptive downward pressure unit includes a sliding bracket 5 that is slidably arranged on the frame 1. At least one pneumatic telescopic rod 12 is arranged between the sliding bracket 5 and the frame 1 for pushing the sliding bracket 5 to perform linear reciprocating sliding motion. The pneumatic telescopic rod 12 is connected to a constant pressure air source through an air supply pipe 13. The adaptive downward pressure unit provides a stable downward pressure to the sliding bracket 5 on which the concrete body cutting unit is installed, thereby pushing the sliding bracket 5 to perform linear movement, so as to achieve the feed amount of the concrete body cutting unit when cutting the concrete body. Since the downward pressure provided by the adaptive downward pressure unit is constant, the feed amount can be adaptively adjusted according to the actual state of the cutting. For example, when the internal structural strength of the cut concrete body is low, and the density and hardness are not up to standard, then under the action of the constant downward pressure F, its feed speed is v. 1 When the internal structure strength, density and hardness of the concrete body being cut are high, and it contains a large amount of high-hardness coarse aggregate, at this time, under the same constant downward pressure F, the feed speed is v 2 , because the higher the hardness and strength of the concrete, the greater the cutting resistance and the smaller the feed speed, then v 2 <v 1 , so as to achieve the purpose of adaptively adjusting the feed speed according to the different strength and hardness of the concrete objects being cut, thereby obtaining a flat and smooth concrete specimen.

[0032] Combination Figure 2 and Figure 3 As shown, the concrete body cutting unit includes a first motor 7 mounted on a sliding bracket 5, the output shaft of the first motor 7 passes through the sliding bracket 5 and is coaxially connected to a hollow drill 8, and a support platform 10 for fixing and placing the concrete body is also fixedly provided on the frame 1, and the support platform 10 is arranged directly below the hollow drill 8. The hollow drill 8 is driven to rotate by the first motor 7, and contacts with the concrete body under the action of the downward pressure provided by the adaptive downward pressure unit to achieve cutting, and the cutting principle is consistent with the existing concrete body coring and cutting device.

[0033] On the basis of the above, the present embodiment further provides an optimization solution with a stable structure, simplicity and practicality. Specifically, the adaptive downward pressure unit also includes guide rails 9 vertically arranged at both ends of the support platform 10, and both ends of the sliding bracket 5 are fixedly connected with rings slidably sleeved on the guide rails 9. Two pneumatic telescopic rods 12 are symmetrically arranged between the two sides of the upper end surface of the sliding bracket 5 and the frame 1, and any pneumatic telescopic rod 12 is connected to the constant pressure air source through the air supply pipe 13. The constant pressure gas source provides high pressure gas to the pneumatic telescopic rod 12 to push the pneumatic telescopic rod 12 to extend, thereby pushing the sliding bracket 5 to move downward until the hollow drill 8 contacts the concrete body to be cut below. When the hollow drill 8 contacts the concrete body, the cutting feed rate will be significantly reduced due to the high hardness of the concrete body. However, since the constant pressure gas source always acts on the pneumatic telescopic rod 12, the pneumatic telescopic rod 12 always applies a vertical downward pressure to the sliding bracket 5, thereby achieving the purpose of adaptive cutting and avoiding the problem of excessive instantaneous feed rate caused by mechanical downward pressure, which causes instantaneous overload to the hollow drill 8 and the first motor 7 and easily causes damage to the components. Since the pressure of the constant pressure gas source will not change, the downward pressure applied by the pneumatic telescopic rod 12 on the sliding bracket 5 is always constant, which can ensure that the hollow drill 8 always maintains the same downward pressure during the entire cutting process, and the problem of instantaneous overload will not occur. In this way, the concrete body can be cut evenly, linearly and continuously to obtain a concrete body specimen with good surface quality.

[0034] The constant pressure gas source can be realized by the following scheme: the constant pressure gas source includes the gas supply pipe 13, the gas tank 14 and the air pump 15 which are connected in sequence, the air pump 15 is drivingly connected to the second motor 16, and the second motor 16 is controlled by an air pressure switch which is arranged on the gas tank 14 and is controlled by the internal air pressure of the gas tank 14.

[0035] At the same time, this embodiment also provides another option of a constant pressure air source. In order to reduce costs and improve convenience, the practical constant pressure air source is an adjustable pressure air compressor, such as an ordinary air compressor available on the market. However, the maximum pressure that the air compressor can provide should not be lower than the minimum pressure requirement of the actual application scenario.

[0036] In order to realize the whole body cutting of the concrete body, the support platform 10 is provided with an avoidance hole 11 for avoiding the hollow drill 8. In this way, the whole concrete body can be completely cut to obtain a complete concrete body specimen without knocking, thus avoiding the problem of surface damage of the concrete body specimen.

[0037] As another optimized structural setting of this embodiment, a spray mechanism is also added to further obtain a concrete specimen with good surface quality during the cutting process. In this embodiment, the spray mechanism includes a water tank 2 fixedly mounted on the frame 1, and the water tank 2 is connected to a spray water tank 6 arranged on the sliding bracket 5 through a water supply pipe 4. A plurality of nozzles 17 for spraying water are arranged in a circular array at the lower part of the spray water tank 6, and the nozzles of the nozzles 17 face the center direction of the circular array. The spray water tank 6 has a through hole for avoiding the hollow drill 8. The above arrangement is adopted to utilize the water's own pressure to naturally pass through the pipeline and spray out from the nozzle 17. The advantage of such an arrangement is that spraying does not consume energy, and it can be achieved by utilizing the height difference between the water tank 2 and the nozzle 17. However, there are also disadvantages. Since concrete cutting often causes the temperature of the hollow drill 8 to rise sharply in a short time, the natural downward flow may cause insufficient spray water, resulting in instantaneous local high temperature and burning the cutting teeth of the hollow drill. Of course, in a conventional low-speed cutting environment, natural spray cooling is sufficient to meet the cutting conditions for coring of concrete bodies. For extreme cutting environments, this embodiment has made further improvements on the basis of the above-mentioned spray mechanism. For example, in order to better cool the hollow drill 8 and facilitate slag discharge, the water supply pipe 4 is also provided with a pump 3 for pressurizing the water flow in the nozzle 17. The drive of the pump 3 can increase the spray water flow of the nozzle 17, increase the flushing and cooling strength, and avoid the problem of local high temperature burning of the cutting part of the hollow drill 8, which leads to a reduction in the life of the hollow drill 8.

[0038] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An adaptive downward pressure device for coring a concrete body, comprising a frame (1), an adaptive downward pressure cutting mechanism mounted on the frame (1) for cutting and coring a concrete body, characterized in that: The adaptive downward pressure cutting mechanism comprises an adaptive downward pressure unit and a concrete body cutting unit; The adaptive downward pressing unit comprises a sliding bracket (5) slidably arranged on the frame (1), at least one pneumatic telescopic rod (12) for pushing the sliding bracket (5) to perform linear reciprocating sliding motion is arranged between the sliding bracket (5) and the frame (1), and the pneumatic telescopic rod (12) is connected to a constant pressure air source via an air supply pipe (13); The concrete body cutting unit comprises a first motor (7) mounted on a sliding bracket (5); an output shaft of the first motor (7) passes through the sliding bracket (5) and is coaxially connected to a hollow drill (8); a support platform (10) for fixing the concrete body is also fixedly arranged on the frame (1); the support platform (10) is arranged directly below the hollow drill (8).

2. The self-adaptive downward pressure device for coring concrete according to claim 1, characterized in that: The adaptive downward pressing unit further comprises guide rails (9) vertically arranged at both ends of the support platform (10); sleeve rings slidably sleeved on the guide rails (9) are fixedly connected at both ends of the sliding bracket (5); two pneumatic telescopic rods (12) are symmetrically arranged between the upper end surface of the sliding bracket (5) and the frame (1) on both sides; and any pneumatic telescopic rod (12) is connected to the constant pressure air source via the air supply pipe (13).

3. The self-adaptive pressing device for coring concrete according to claim 2, characterized in that: The constant pressure gas source comprises the gas supply pipe (13), the gas storage tank (14) and the air pump (15) which are connected in sequence, the air pump (15) being drivingly connected to the second motor (16), and the second motor (16) being controlled by a gas pressure switch which is arranged on the gas storage tank (14) and is controlled to be on and off by the gas pressure inside the gas storage tank (14).

4. The self-adaptive pressing device for coring concrete according to claim 2, characterized in that: The constant pressure air source is an adjustable pressure air compressor.

5. The self-adaptive downward pressure device for coring concrete according to claim 1, characterized in that: The support platform (10) is provided with an avoidance hole (11) for avoiding the hollow drill (8).

6. A concrete body coring adaptive downward pressure device according to any one of claims 1 to 5, characterized in that: It also includes a spray mechanism, the spray mechanism including a water storage tank (2) fixedly mounted on the frame (1), the water storage tank (2) being connected to a spray water tank (6) arranged on the sliding bracket (5) through a water supply pipe (4), a plurality of nozzles (17) for spraying water being arranged in a circular array at the lower part of the spray water tank (6), the nozzles of the nozzles (17) facing the center direction of the circular array, and a through hole for avoiding the hollow drill (8) being provided on the spray water tank (6).

7. The self-adaptive downward pressure device for coring concrete according to claim 6, characterized in that: The water supply pipe (4) is also provided with a pump (3) for pressurizing the water flow in the nozzle (17).

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