Device and method for detecting strength of precast concrete component

Abstract

The invention relates to the technical field of sampling devices, in particular to a precast concrete component strength detection device and method.The precast concrete component strength detection device comprises a sampling cutting head, the sampling cutting head comprises a rotating shaft, a cutting knife, an outer cylinder and an inner cylinder, the outer cylinder and the inner cylinder are coaxially arranged in a sleeved mode, and the interior of the inner cylinder is a containing cavity used for containing a sample core; the rotating shaft rotates to drive the outer cylinder to rotate, and the cutting knife is arranged at the lower end of the outer cylinder so as to cut and core concrete; the sampling cutting head is further connected with a water supply device, an annular cavity is formed between the outer cylinder and the inner cylinder, the water supply device is connected with the annular cavity and conveys cooling water into the annular cavity, and a damping strip is spirally arranged in the annular cavity along the periphery of the inner cylinder and is in sealing fit with the outer wall of the inner cylinder and the inner wall of the outer cylinder. And the cooling water spirally passes through the annular cavity. The technical problem that in the prior art, when a sampling device is used for coring, the stress in a sample core is easily changed, and the accuracy of a detection result is influenced is solved.

Description

Technical Field

[0001] The invention relates to the technical field of sampling devices, and in particular to a device and method for detecting strength of a prefabricated concrete component. Background Art

[0002] In the prior art, when testing the strength of concrete, it is necessary to first perform a coring operation from a prefabricated component, and then test and analyze the bonding condition and strength of the concrete core of the sample core.

[0003] The device for sampling concrete in the prior art, such as a concrete sampler with parallel segment cutting disclosed in the Chinese invention patent with authorization announcement number CN112924220B, includes a base, a support frame and a cutting sampling head, the support frame is a gantry structure, the lower end of the support frame is fixed to the base by bolts, the cutting sampling head is movably installed on the support frame, and the cutting sampling head includes a vertical sampling tube and a cutting blade arranged in the vertical sampling tube. When working, the cutting sampling head descends, so that the cutting blade of the cutting sampling head contacts the concrete ground, and the cutting head rotates at high speed to cut the concrete.

[0004] During the coring process of the sampling device, the vertical sampling tube vibrates and easily hits the internal sample core, which can easily change the stress inside the sample core and affect the accuracy of the test results. Summary of the invention

[0005] In order to overcome the shortcomings of the prior art, the present invention proposes a concrete precast component strength detection device and method to solve the technical problem that the sampling device in the prior art easily changes the stress inside the sample core when coring, thereby affecting the accuracy of the detection result.

[0006] A precast concrete component strength detection device and method of the present invention adopts the following technical solutions: A concrete prefabricated component strength detection device and method, including a base, a support frame and a sampling cutting head, the support frame is arranged on the base, the sampling cutting head is arranged on the support frame and can be lifted up and down relative to the support frame, the sampling cutting head includes a rotating shaft with an axis extending in the up-down direction, and also includes a cutting knife and an outer cylinder and an inner cylinder coaxially sleeved together, the axes of the outer cylinder and the inner cylinder both extend in the up-down direction and are coaxially arranged with the rotating shaft, the interior of the inner cylinder is a accommodating chamber for accommodating a sample core, the upper end of the inner cylinder is rotatably connected or fixedly connected to the rotating shaft, the upper end of the outer cylinder is fixedly connected to the rotating shaft, and the rotating shaft When rotating, the outer cylinder is driven to rotate, and the cutting knife is arranged at the lower end of the outer cylinder. There are multiple cutting knives and they are evenly distributed along the circumference of the outer cylinder. When the outer cylinder rotates, the cutting knife is driven to rotate to cut and coring the concrete; the sampling cutting head is also connected to a water supply device, and an annular chamber is provided between the outer cylinder and the inner cylinder. The water supply device is connected to the annular chamber and transports cooling water into the annular chamber. The cooling water flows from the lower end of the annular chamber to the cutting knife. Shock-absorbing strips are spirally arranged along the outer circumference of the inner cylinder in the annular chamber. The shock-absorbing strips are respectively sealed with the outer wall of the inner cylinder and the inner wall of the outer cylinder to allow the cooling water to spirally pass through the annular chamber.

[0007] Furthermore, the shock-absorbing strip is fixedly connected to one of the inner tube and the outer tube, and is in sealing contact with the other one. The cross-section of the shock-absorbing strip is V-shaped. When the outer tube is deflected relative to the inner tube, the inner tube and the outer tube will squeeze the V-shaped shock-absorbing strip to cause folding and deformation.

[0008] Furthermore, an adjusting ring is provided at the lower end of the annular chamber between the inner cylinder and the outer cylinder, the adjusting ring is coaxially arranged with the inner cylinder and the outer cylinder, and the adjusting ring is movably arranged between the inner cylinder and the outer cylinder along the up and down directions, the adjusting ring is located above the cutting knife, and a plurality of water holes are opened on the adjusting ring, the water holes spray cooling water toward the cutting knife, and when the cooling water pressure in the annular chamber increases, the cooling water can drive the adjusting ring to move downward.

[0009] Furthermore, three cutting knives are evenly spaced along the circumference of the outer cylinder, each of the cutting knives comprises an arc-shaped knife holder and a blade mounted on the arc-shaped knife holder, the arc radius of the arc-shaped knife holder is the same as the radius of the outer cylinder, and the upper end surface of the arc-shaped knife holder is in contact with the lower end surface of the outer cylinder, and the upper end surface of the arc-shaped knife holder is respectively provided with a fixed pin and a movable pin whose axes extend in the up-down direction, the fixed pin and the movable pin are respectively located at the two ends of the arc-shaped knife holder, the fixed pin is fixed on the upper end surface of the arc-shaped knife holder, a mounting hole corresponding to the movable pin is provided on the upper end surface of the arc-shaped knife holder, a reset spring is provided in the mounting hole, and the movable pin is floatingly mounted in the mounting hole along the up-down direction, and a first plug hole and a second plug hole are respectively provided at the lower end of the outer cylinder for plugging and cooperating with the fixed pin and the movable pin in a one-to-one correspondence, and the arc-shaped knife holder is connected to the lower end of the outer cylinder through the fixed pin and the movable pin.

[0010] Furthermore, three pressure blocks are fixed at intervals on the outer circumferential surface of the adjusting ring, and three connecting grooves respectively connected to the second insertion holes are opened on the inner wall of the outer cylinder. The pressure blocks extend into the second insertion holes through the connecting grooves, and each pressure block corresponds to the movable pin on each arc-shaped tool holder up and down. When the adjusting ring moves downward, the pressure block presses down the movable pin shaft and presses the movable pin shaft into the mounting hole of the arc-shaped tool holder to disengage the movable pin shaft from the second insertion hole. When the movable pin shaft disengages from the second insertion hole, the end of the arc-shaped tool holder close to the movable pin shaft can swing toward the center of the outer cylinder around the fixed pin shaft, so that the blade can cut the sample core in the inner cylinder along the radial direction of the inner cylinder.

[0011] Furthermore, the upper ends of the inner cylinder and the outer cylinder are fixedly connected to the rotating shaft at the same time, the upper end of the inner cylinder is closed, the top wall of the inner cylinder is fixedly connected to the lower end of the rotating shaft, the upper end of the outer cylinder has an inner flange, the lower end of the rotating shaft passes through the center of the inner flange, the outer cylinder is fixedly connected to the rotating shaft through the inner flange, a water injection hole is provided at the center of the rotating shaft, the upper end of the water injection hole is connected to the water supply device through a water pipe, a radial hole connected to the water injection hole is provided on the side wall of the rotating shaft, a connecting cavity is provided between the lower side of the inner flange and the top wall of the inner cylinder, and the water injection hole is connected to the annular chamber through the radial hole and the connecting cavity.

[0012] Furthermore, a lifting frame is provided on the support frame along the up-down direction, the rotating shaft is rotatably installed on one side of the lifting frame along the up-down direction, a rotary drive motor is provided in the lifting frame, a pulley is fixed on the rotating shaft, and the rotary drive motor is connected to the pulley through a transmission belt.

[0013] Furthermore, the support frame is a gantry bracket including two columns and a crossbeam, and the two ends of the lifting frame are respectively guided and slidably installed on the two columns, a threaded rod is rotatably installed in the middle of the crossbeam, and a threaded hole is provided in the center of the lifting frame, and the threaded rod is installed in the threaded hole. A hand wheel is connected to the upper end of the threaded rod, and the threaded rod is driven to rotate by rotating the hand wheel to realize the lifting and lowering of the lifting frame.

[0014] Furthermore, the base includes a moving frame and moving wheels arranged on the moving frame, the lower ends of the two columns of the support frame are respectively fixed on the moving frame, the moving frame is provided with a push rod and a floor support for cooperating with a ground support.

[0015] The detection method using the above-mentioned concrete prefabricated component strength detection device includes the following steps: lowering the sampling cutting head so that the cutting knife at the lower end of the outer cylinder contacts the concrete ground below, the water supply device delivers cooling water to the annular chamber, and then the rotating shaft rotates to drive the outer cylinder and the cutting knife to rotate, the cutting knife rotates along the circumference of the outer cylinder to cut the concrete, and at the same time the sampling cutting head continues to move downward so that the inner cylinder covers the outside of the cut cylindrical sample core, the inner wall of the inner cylinder is matched with the outer wall of the sample core, and the shock-absorbing strip located between the outer cylinder and the inner cylinder plays a shock-absorbing role when the outer cylinder is vibrated, thereby reducing the collision with the inner cylinder and the sample core.

[0016] The beneficial effects of the present invention are as follows: a concrete prefabricated component strength detection device and method of the present invention, the sampling and cutting head of the concrete prefabricated component strength detection device includes an inner cylinder and an outer cylinder arranged coaxially, the inner cylinder is covered on the periphery of the sample core when cutting the sample core, and cooperates with the outer wall of the sample core to guide, and the outer cylinder is provided with a cutting knife, and drives the cutting knife to rotate to cut concrete. In the present invention, by filling cooling water between the inner cylinder and the outer cylinder, and the cooling water provided by the water supply device has a set water pressure, a hydraulic chamber is formed between the inner cylinder and the outer cylinder, which has a certain shock-absorbing effect, and the spirally arranged shock-absorbing strips separate the annular chamber between the inner cylinder and the outer cylinder into a spiral waterway, and under the action of water pressure, the spiral waterway can play a certain supporting role between the inner cylinder and the outer cylinder, reduce the influence of the vibration of the outer cylinder on the inner cylinder and the sample core, and thus solve the technical problem that the sampling device in the prior art is easy to change the stress inside the sample core when coring, thereby affecting the accuracy of the detection result.

[0017] Furthermore, the cutting knife of the present invention is configured to adjust the connection mode with the outer cylinder according to the water pressure in the annular chamber. When the water pressure increases, one end of the cutting knife can swing toward the center of the outer cylinder. During operation, after the sampling cutting head moves downward to a set distance, the adjustment ring can be driven to move downward by increasing the water supply pressure of the water supply device into the annular chamber. When the adjustment ring moves downward, the pressure block on the outer periphery of the adjustment ring will press down the corresponding movable pin shaft, and press the movable pin shaft into the mounting hole of the arc-shaped tool holder, so that the movable pin shaft is disengaged from the second socket. After the movable pin shaft is disengaged from the second socket, the end of the arc-shaped tool holder close to the movable pin shaft can swing toward the center of the outer cylinder around the fixed pin shaft, so that the blade can cut the sample core in the inner cylinder along the radial direction of the inner cylinder, so that the sample core can be cut off by the swinging of the cutting knife. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention 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 invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work. Those skilled in the art should understand that these drawings are not necessarily drawn to scale.

[0019] Figure 1 It is a three-dimensional schematic diagram of an embodiment of a precast concrete component strength detection device of the present invention; Figure 2 Another three-dimensional schematic diagram of an embodiment of a precast concrete component strength detection device of the present invention (explosion diagram of the sampling cutting head); Figure 3 for Figure 2 A magnified view of the local area A in FIG. Figure 4 It is a front view of an embodiment of a precast concrete component strength detection device of the present invention; Figure 5 for Figure 4 Middle BB section view; Figure 6 for Figure 5 A magnified view of the local C in the middle; Figure 7 for Figure 4 Middle DD section view; Figure 8 for Figure 7 A magnified view of the local E in the middle; Fig. 9 for Figure 7 A magnified view of the local F in the middle; Fig.10A bottom view of an embodiment of a precast concrete component strength detection device of the present invention; Fig.11 for Fig.10 A magnified view of local G in the figure.

[0020] In the figure: 100, moving frame; 110, moving wheel; 111, floor support; 112, push rod; 113, support frame; 114, lifting frame; 115, water injection hole; 116, fixed seat; 117, pulley; 118, rotary drive motor; 119, radial hole; 120, outer cylinder; 121, first plug hole; 122, second plug hole; 123, shock absorbing strip; 130, inner cylinder; 140, arc-shaped tool holder; 141, fixed pin; 142, movable pin; 143, blade; 150, adjusting ring; 151, water hole; 152, pressure block; 153, hand wheel. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0022] An embodiment of a precast concrete component strength detection device of the present invention is as follows: Figures 1 to 11As shown, the strength detection device for precast concrete components includes a base, a support frame 113 and a sampling cutting head, wherein the support frame 113 is arranged on the base, and the sampling cutting head is arranged on the support frame 113 and can be lifted up and down relative to the support frame 113. In this embodiment, the support frame 113 is a gantry bracket including two columns and a crossbeam, and the base includes a mobile frame 100 and a mobile wheel 110 arranged on the mobile frame 100, and the lower ends of the two columns are respectively fixed on the mobile frame 100, and the mobile frame 100 is provided with a hand push rod 112 and a floor support 111 for cooperating with a ground support. When in use, the hand push rod 112 can be pushed to push the strength detection device for precast concrete components to a set position, and then the floor support 111 is screwed and adjusted to make it cooperate with the ground support, thereby realizing that the mobile frame 100 is stably fixed on the ground. In this embodiment, a lifting frame 114 is provided on the support frame 113 to guide in the up and down directions. A fixing seat 116 is fixed on one side of the lifting frame 114. The sampling cutting head is arranged on the fixing seat 116 of the lifting frame 114. The two ends of the lifting frame 114 are respectively guided and slidably installed on two columns. A threaded rod is rotatably installed in the middle of the crossbeam of the support frame 113. A threaded hole is provided in the center of the lifting frame 114. The threaded rod is installed in the threaded hole. A hand wheel 153 is connected to the upper end of the threaded rod. The threaded rod is driven to rotate by rotating the hand wheel 153 to realize the lifting and lowering of the lifting frame 114, thereby driving the sampling cutting head to move up and down, thereby cutting and sampling the concrete floor below.

[0023] In the present invention, the sampling cutting head includes a rotating shaft whose axis extends in the up-down direction, and also includes a cutting knife and an outer cylinder 120 and an inner cylinder 130 which are coaxially sleeved together. The rotating shaft is rotatably mounted on one side of the lifting frame 114 in the up-down direction. A rotating drive motor 118 is provided in the lifting frame 114. A pulley 117 is fixed on the rotating shaft. The rotating drive motor 118 is connected to the pulley 117 through a transmission belt, thereby driving the rotating shaft to rotate. The axes of the outer cylinder 120 and the inner cylinder 130 are both extended in the up-down direction and are coaxially arranged with the rotating shaft. The interior of the inner cylinder 130 is a receiving cavity for receiving the sample core. The upper end of the inner cylinder 130 is rotatably connected or fixedly connected to the rotating shaft. In this embodiment, the upper end of the inner cylinder 130 is fixedly connected to the rotating shaft. The upper end of the outer cylinder 120 is fixedly connected to the rotating shaft. When the rotating shaft rotates, it can drive the outer cylinder 120 and the inner cylinder 130 to rotate synchronously. The cutting blades are arranged at the lower end of the outer cylinder 120 , and are evenly distributed along the circumference of the outer cylinder 120 . When the outer cylinder 120 rotates, the cutting blades are driven to rotate, so as to cut and coring the concrete.

[0024] In the present invention, the sampling cutting head is also connected to a water supply device, and an annular chamber is provided between the outer cylinder 120 and the inner cylinder 130. The water supply device is connected to the annular chamber and delivers cooling water into the annular chamber, and the cooling water flows from the lower end of the annular chamber to the cutting knife. A damping strip 123 is spirally arranged along the outer circumference of the inner cylinder 130 in the annular chamber, and the damping strip 123 is respectively sealed with the outer wall of the inner cylinder 130 and the inner wall of the outer cylinder 120, so that the cooling water spirals through the annular chamber. In this embodiment, the damping strip 123 is fixedly connected to one of the inner cylinder 130 and the outer cylinder 120, and is in sealing contact with the other. The cross section of the damping strip 123 is V-shaped. When the outer cylinder 120 is deflected relative to the inner cylinder 130, the inner cylinder 130 and the outer cylinder 120 will squeeze the V-shaped damping strip 123 to fold and deform. The present invention fills cooling water between the inner cylinder 130 and the outer cylinder 120, and the cooling water provided by the water supply device has a set water pressure, so that a hydraulic chamber is formed between the inner cylinder 130 and the outer cylinder 120, which has a certain shock-absorbing effect, and the spirally arranged shock-absorbing strips 123 divide the annular chamber between the inner cylinder 130 and the outer cylinder 120 into a spiral waterway, and under the action of water pressure, the spiral waterway can play a certain supporting role between the inner cylinder 130 and the outer cylinder 120, thereby reducing the influence of the vibration of the outer cylinder 120 on the inner cylinder 130 and the sample core.

[0025] In this embodiment, an adjusting ring 150 is provided at the lower end of the annular chamber between the inner cylinder 130 and the outer cylinder 120. The adjusting ring 150 is coaxially arranged with the inner cylinder 130 and the outer cylinder 120, and the adjusting ring 150 is movably arranged between the inner cylinder 130 and the outer cylinder 120 along the up and down directions. The adjusting ring 150 is located above the cutting knife, and a plurality of water holes 151 are provided on the adjusting ring 150. The water holes 151 spray cooling water toward the cutting knife to cool the cutting knife and reduce the generation of dust.

[0026] Three cutting knives are evenly spaced along the circumference of the outer cylinder 120, and each of the cutting knives includes an arc-shaped knife holder 140 and a blade 143 mounted on the arc-shaped knife holder 140. The arc radius of the arc-shaped knife holder 140 is the same as the radius of the outer cylinder 120, and the upper end surface of the arc-shaped knife holder 140 is in contact with the lower end surface of the outer cylinder 120. A fixed latch and a movable latch with axes extending in the up-down direction are respectively provided on the upper end surface of the arc-shaped knife holder 140, and the fixed latch and the movable latch are respectively located at two ends of the arc-shaped knife holder 140. The fixed latch is fixed on the upper end surface of the arc-shaped knife holder 140, and a mounting hole corresponding to the movable latch is provided on the upper end surface of the arc-shaped knife holder 140, and a reset spring is provided in the mounting hole, and the movable latch is floatingly mounted in the mounting hole in the up-down direction. The lower end of the outer cylinder 120 is provided with a first plug hole 121 and a second plug hole 122 for respectively correspondingly plugging with the fixed pin and the movable pin, and the arc-shaped tool holder 140 is connected to the lower end of the outer cylinder 120 through the fixed pin and the movable pin.

[0027] In this embodiment, three pressing blocks 152 are fixed at intervals on the outer circumference of the adjusting ring 150, and three connecting grooves are provided on the inner wall of the outer cylinder 120, which are respectively connected with the second plug hole 122. The three pressing blocks 152 extend into the corresponding second plug hole 122 through the corresponding connecting grooves, and each pressing block 152 corresponds to the movable pin on each arc-shaped tool holder 140. In the present invention, when the cooling water pressure in the annular chamber increases, the cooling water will drive the adjusting ring 150 to move downward. During operation, when the sampling cutting head moves downward to a set distance, the adjusting ring 150 can be driven to move downward by increasing the water supply pressure of the water supply device to the annular chamber. When the adjusting ring 150 moves downward, the pressing blocks 152 on the outer periphery of the adjusting ring 150 will press down the corresponding movable pin 142, and press the movable pin 142 into the mounting hole of the arc-shaped tool holder 140, so that the movable pin 142 is separated from the second plug hole 122. When the movable pin 142 is separated from the second insertion hole 122, the end of the arc-shaped knife holder 140 close to the movable pin 142 can swing around the fixed pin 141 toward the center of the outer cylinder 120, so that the blade 143 can cut the sample core in the inner cylinder 130 along the radial direction of the inner cylinder 130, so that the sample core can be cut off by the swing of the cutting knife. In this embodiment, a reset torsion spring is connected between the outer periphery of the fixed pin 141 and the first insertion hole 121, and the arc-shaped knife holder 140 is reset by the action of the reset torsion spring. At the same time, when the water pressure of the water supply device decreases, the movable pin 142 is reset and the adjusting ring 150 is pushed upward to reset. In other embodiments, the reset torsion spring may not be provided, and the arc-shaped knife holder 140 can be reset manually after the sampling cutting head is withdrawn from the concrete.

[0028] In this embodiment, the upper end of the inner cylinder 130 is closed, the top wall of the inner cylinder 130 is fixedly connected to the lower end of the rotating shaft, the upper end of the outer cylinder 120 has an inner flange, the lower end of the rotating shaft passes through the center of the inner flange, the outer cylinder 120 is fixedly connected to the rotating shaft through the inner flange, a water injection hole 115 is provided at the center of the rotating shaft, the upper end of the water injection hole 115 is connected to the water supply device through a water pipe, a radial hole 119 connected to the water injection hole 115 is provided on the side wall of the rotating shaft, a connecting cavity is provided between the lower side of the inner flange and the top wall of the inner cylinder 130, and the water injection hole 115 is connected to the annular chamber through the radial hole 119 and the connecting cavity.

[0029] The present invention provides an embodiment of a detection method using the above-mentioned precast concrete component strength detection device, wherein the precast concrete component strength detection device is as follows: Figures 1 to 11 As shown, before use, the precast concrete component strength detection device is first moved to the concrete floor position where sampling is required, and the base is stably fixed on the ground by screwing the floor support 111. The method has the following steps: controlling the water supply device to deliver cooling water to the annular chamber, while rotating the drive motor 118 to drive the rotating shaft, the inner cylinder 130 and the outer cylinder 120 to rotate synchronously, and the rotation of the rotating shaft drives the outer cylinder 120 and the cutting knife to rotate. By rotating the hand wheel 153, the lifting frame 114 is driven to descend, so that the sampling cutting head on the lifting frame 114 descends, and when the cutting knife at the lower end of the outer cylinder 120 contacts the concrete floor below, the cutting knife rotates along the circumference of the outer cylinder 120 to cut the concrete. At the same time, the sampling cutting head continues to move downward, so that the inner cylinder 130 covers the outside of the cut cylindrical sample core, and the inner wall of the inner cylinder 130 cooperates with the outer wall of the sample core. The shock absorbing strip 123 located between the outer cylinder 120 and the inner cylinder 130 plays a shock absorbing role when the outer cylinder 120 is vibrated, reducing the collision of the inner cylinder 130 and the sample core. At the same time, since the cooling water provided by the water supply device has a set water pressure, a hydraulic chamber is formed between the inner cylinder 130 and the outer cylinder 120, which has a certain shock absorbing effect, and the spirally arranged shock absorbing strip 123 divides the annular chamber between the inner cylinder 130 and the outer cylinder 120 into a spiral waterway, and under the action of water pressure, the spiral waterway can play a certain supporting role between the inner cylinder 130 and the outer cylinder 120, reducing the impact of the vibration of the outer cylinder 120 on the inner cylinder 130 and the sample core.

[0030] When the sampling cutting head moves downward to a set distance, the water supply pressure of the water supply device into the annular chamber is increased, thereby driving the adjustment ring 150 to move downward. When the adjustment ring 150 moves downward, the pressure block 152 on the outer periphery of the adjustment ring 150 presses down the corresponding movable pin 142, and presses the movable pin 142 into the mounting hole of the arc-shaped tool holder 140, so that the movable pin 142 is disengaged from the second insertion hole 122. When the movable pin 142 is disengaged from the second insertion hole 122, the end of the arc-shaped tool holder 140 close to the movable pin 142 can swing around the fixed pin 141 toward the center of the outer cylinder 120, so that the blade 143 can cut the sample core in the inner cylinder 130 along the radial direction of the inner cylinder 130, so that the sample core can be cut off by the swing of the cutting knife.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A precast concrete component strength detection device, comprising a base, a support frame (113) and a sampling cutting head, wherein the support frame (113) is arranged on the base, and the sampling cutting head is arranged on the support frame (113) and can be lifted up and down relative to the support frame (113), characterized in that: The sampling cutting head comprises a rotating shaft whose axis extends in the up-down direction, and also comprises a cutting knife and an outer cylinder (120) and an inner cylinder (130) which are coaxially sleeved together. The axes of the outer cylinder (120) and the inner cylinder (130) extend in the up-down direction and are coaxially arranged with the rotating shaft. The interior of the inner cylinder (130) is a receiving cavity for receiving a sample core. The upper end of the inner cylinder (130) is rotatably connected or fixedly connected to the rotating shaft. The upper end of the outer cylinder (120) is fixedly connected to the rotating shaft. When the rotating shaft rotates, the outer cylinder (120) is driven to rotate. The cutting knife is arranged at the lower end of the outer cylinder (120). The cutting knife has a plurality of parts and is arranged along the rotating shaft. The outer cylinder (120) is evenly distributed in the circumference, and when the outer cylinder (120) rotates, it drives the cutting blade to rotate, so as to cut and coring the concrete; the sampling cutting head is also connected to a water supply device, and an annular chamber is provided between the outer cylinder (120) and the inner cylinder (130); the water supply device is connected to the annular chamber and transports cooling water into the annular chamber, and the cooling water flows from the lower end of the annular chamber to the cutting blade; a shock absorbing strip (123) is spirally arranged along the outer circumference of the inner cylinder (130) in the annular chamber, and the shock absorbing strip (123) is respectively sealed with the outer wall of the inner cylinder (130) and the inner wall of the outer cylinder (120), so that the cooling water spirally passes through the annular chamber.

2. The precast concrete component strength detection device according to claim 1, characterized in that: The shock absorbing strip (123) is fixedly connected to one of the inner tube (130) and the outer tube (120), and is in sealing contact with the other one; the cross section of the shock absorbing strip (123) is V-shaped; when the outer tube (120) is deflected relative to the inner tube (130), the inner tube (130) and the outer tube (120) will squeeze the V-shaped shock absorbing strip (123) to cause folding and deformation.

3. The precast concrete component strength detection device according to claim 1, characterized in that: An adjusting ring (150) is provided at the lower end of the annular chamber between the inner cylinder (130) and the outer cylinder (120); the adjusting ring (150) is coaxially arranged with the inner cylinder (130) and the outer cylinder (120), and the adjusting ring (150) is movably arranged between the inner cylinder (130) and the outer cylinder (120) in an up-down direction; the adjusting ring (150) is located above the cutting blade, and a plurality of water holes (151) are provided on the adjusting ring (150); the water holes (151) spray cooling water toward the cutting blade; when the cooling water pressure in the annular chamber increases, the cooling water drives the adjusting ring (150) to move downward.

4. The precast concrete component strength detection device according to claim 3, characterized in that: Three cutting knives are evenly spaced along the circumference of the outer cylinder (120), each of the cutting knives comprising an arc-shaped knife holder (140) and a blade (143) mounted on the arc-shaped knife holder (140), the arc radius of the arc-shaped knife holder (140) being the same as the radius of the outer cylinder (120), the upper end surface of the arc-shaped knife holder (140) being in contact with the lower end surface of the outer cylinder (120), and a fixed latch and a movable latch, the axes of which extend in the up-down direction, are respectively provided on the upper end surface of the arc-shaped knife holder (140), the fixed latch and the movable latch are respectively located on the arc-shaped knife holder The arc-shaped tool holder (140) has two ends, the fixed pin is fixed on the upper end surface of the arc-shaped tool holder (140), the upper end surface of the arc-shaped tool holder (140) is provided with a mounting hole corresponding to the movable pin, a return spring is provided in the mounting hole, the movable pin is floatingly mounted in the mounting hole along the up and down direction, the lower end of the outer cylinder (120) is provided with a first plug hole (121) and a second plug hole (122) for respectively correspondingly plugging with the fixed pin and the movable pin, and the arc-shaped tool holder (140) is connected to the lower end of the outer cylinder (120) through the fixed pin and the movable pin.

5. The precast concrete component strength detection device according to claim 4, characterized in that: Three pressure blocks (152) are fixed at intervals on the outer circumferential surface of the adjustment ring (150); three communication grooves are opened on the inner wall of the outer cylinder (120) and are respectively connected to the second insertion hole (122); the pressure blocks (152) extend into the second insertion hole (122) through the communication grooves; each pressure block (152) corresponds to a movable pin on each arc-shaped tool holder (140) in upper and lower positions; when the adjustment ring (150) moves downward, the pressure blocks (152) press down the movable pin shaft (142). and the movable pin (142) is pressed into the mounting hole of the arc-shaped tool holder (140) so that the movable pin (142) is disengaged from the second insertion hole (122); when the movable pin (142) is disengaged from the second insertion hole (122), an end of the arc-shaped tool holder (140) close to the movable pin (142) can swing around the fixed pin (141) toward the center of the outer cylinder (120) so that the blade (143) can cut the sample core in the inner cylinder (130) along the radial direction of the inner cylinder (130).

6. The precast concrete component strength detection device according to claim 5, characterized in that: The upper ends of the inner cylinder (130) and the outer cylinder (120) are fixedly connected to the rotating shaft at the same time. The upper end of the inner cylinder (130) is closed. The top wall of the inner cylinder (130) is fixedly connected to the lower end of the rotating shaft. The upper end of the outer cylinder (120) has an inner flange. The lower end of the rotating shaft passes through the center of the inner flange. The outer cylinder (120) is fixedly connected to the rotating shaft via the inner flange. A water injection hole (115) is provided at the center of the rotating shaft. The upper end of the water injection hole (115) is connected to a water supply device via a water pipe. A radial hole (119) communicating with the water injection hole (115) is provided on the side wall of the rotating shaft. A communicating cavity is provided between the lower side of the inner flange and the top wall of the inner cylinder (130). The water injection hole (115) is connected to the annular chamber via the radial hole (119) and the communicating cavity.

7. The precast concrete component strength detection device according to claim 6, characterized in that: A lifting frame (114) is provided on the support frame (113) along the up-down direction, the rotating shaft is rotatably mounted on one side of the lifting frame (114) along the up-down direction, a rotary drive motor (118) is provided inside the lifting frame (114), a belt pulley (117) is fixed on the rotating shaft, and the rotary drive motor (118) is connected to the belt pulley (117) via a transmission belt.

8. The precast concrete component strength detection device according to claim 7, characterized in that: The support frame (113) is a gantry support including two columns and a crossbeam. The two ends of the lifting frame (114) are respectively guided and slidably mounted on the two columns. A threaded rod is rotatably mounted in the middle of the crossbeam. A threaded hole is provided at the center of the lifting frame (114). The threaded rod is mounted in the threaded hole. A hand wheel (153) is connected to the upper end of the threaded rod. The threaded rod is driven to rotate by rotating the hand wheel (153), thereby realizing the lifting and lowering of the lifting frame (114).

9. The precast concrete component strength detection device according to claim 8, characterized in that: The base comprises a moving frame (100) and moving wheels (110) arranged on the moving frame (100); the lower ends of two uprights of the support frame (113) are respectively fixed on the moving frame (100); the moving frame (100) is provided with a push rod (112) and a floor support (111) for cooperating with a ground support.

10. A detection method using the precast concrete component strength detection device according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: lowering the sampling cutting head so that the cutting blade at the lower end of the outer cylinder (120) contacts the concrete floor below; the water supply device delivers cooling water into the annular chamber; then the rotating shaft rotates to drive the outer cylinder (120) and the cutting blade to rotate; the cutting blade rotates along the circumference of the outer cylinder (120) to cut the concrete; and at the same time, the sampling cutting head continues to move downward so that the inner cylinder (130) covers the outside of the cut cylindrical sample core; the inner wall of the inner cylinder (130) cooperates with the outer wall of the sample core in a guiding manner; and the shock absorbing strip (123) located between the outer cylinder (120) and the inner cylinder (130) plays a shock absorbing role when the outer cylinder (120) is vibrated, thereby reducing the collision with the inner cylinder (130) and the sample core.

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