CN111965009A

CN111965009A - Centrifugal concrete hardness detection device of adjustable speed for construction

Info

Publication number: CN111965009A
Application number: CN202010982491.XA
Authority: CN
Inventors: 王海如
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-09-17
Filing date: 2020-09-17
Publication date: 2020-11-20

Abstract

The invention discloses a speed-adjustable centrifugal concrete hardness detection device for building construction, which comprises a base, wherein the top end of the base is fixedly connected with a supporting plate, two sides of the top end of the base are respectively and fixedly connected with two supporting seats, a counterweight cylinder can continuously rotate along the first circular ring and the second circular ring by being provided with components such as a speed-variable motor, a first circular ring, a second circular ring and the like, different centrifugal forces are generated along with different speeds of the speed-variable motor, so that a sample is detected, a friction ring and a brake ring are arranged, the brake and braking effects can be achieved, the working efficiency of the device is ensured, two arc-shaped blocks and two hinge rods are arranged, so that the ladder-shaped blocks can stably descend and avoid rebounding, the detection work is completed, the floor area of a free fall detection device is reduced, and the detection can be accurate, the sample is detected with extremely small errors, so that the accuracy of detection data and the stability of the whole device during detection are greatly improved.

Description

Centrifugal concrete hardness detection device of adjustable speed for construction

Technical Field

The invention relates to the field of concrete detection, in particular to a speed-adjustable centrifugal concrete hardness detection device for building construction.

Background

The existing concrete hardness detection device mostly adopts a weight to freely fall for detection, and when the detection is carried out, the weight needs to be lifted to a certain height, and then a connecting piece is loosened, so that the weight is quickly lowered to be in contact with the surface of a sample, and the detection purpose is achieved.

In the in-process that detects, the promotion of heavy object mostly all relies on the machine, and the rigid demand of free fall height when whole detection device must satisfy the detection, just so caused, device area is big, the resource that consumes is many, and at the decline in-process, though the object is free fall, but during the fixed point detects, owing to lack the direction connecting piece, the deviation appears easily, if set up the direction connecting piece, then there is frictional resistance's the condition, influence the testing effect, therefore an urgent need can accurate fixed point measure and simple portable detection device.

Disclosure of Invention

In order to solve the existing problems, the invention provides a speed-adjustable centrifugal concrete hardness detection device for building construction.

The invention is realized by the following technical scheme:

a speed-adjustable centrifugal concrete hardness detection device for building construction comprises a base, wherein a supporting plate is fixedly connected to the top end of the base, two supporting seats are fixedly connected to two sides of the top end of the base respectively, two air cylinders are fixedly mounted at the top ends of the two supporting seats respectively, a fixing plate is fixedly connected between the top ends of the two air cylinders, a U-shaped plate is fixedly mounted at the bottom end of the fixing plate and arranged between the two supporting seats, a detection groove is formed in the inner bottom surface of the U-shaped plate, a pressure sensor is arranged on one side of the detection groove and fixedly embedded in the inner bottom surface of the U-shaped plate, two positioning rods are fixedly connected to two sides of the bottom end of the U-shaped plate respectively, two positioning sleeves which are in sliding connection are sleeved on the two positioning rods respectively, a first compression spring is, the bottom end of the first compression spring is fixedly connected with the inner bottom surface of the positioning sleeve, the bottom ends of the two positioning sleeves are respectively fixedly connected with the top end of the base, a sliding-connected trapezoidal block is inserted in the center of the top end of the fixing plate, the inclined surface of the trapezoidal block is arranged upwards, the bottom end of the trapezoidal block is fixedly connected with a detection block, the bottom end of the detection block is in a conical shape, two sides of the top end of the fixing plate are respectively and symmetrically provided with two through grooves, the bottom end of the outer wall of the trapezoidal block is respectively and symmetrically and fixedly connected with two L-shaped connecting plates, the top ends of the two L-shaped connecting plates respectively penetrate through the two through grooves and are in sliding connection with the through grooves, two hinging blocks are respectively and fixedly installed at the top ends of the two L-shaped connecting plates, two, the four mounting plates are divided into two groups, the two mounting plates of each group are symmetrically arranged, an arc-shaped block is fixedly connected between the two mounting plates in each group, an arc-shaped groove is arranged on the inner arc wall of the arc-shaped block, an arc-shaped sliding block is connected in the arc-shaped groove in a sliding manner, two reset springs are arranged in the arc-shaped groove, the arc-shaped sliding block is arranged between the two reset springs, two ends of the arc-shaped sliding block are respectively and fixedly connected with one ends of the two reset springs, the other ends of the two reset springs are respectively and fixedly connected with two inner walls of the arc-shaped groove, a connecting rod is fixedly connected on the inner arc wall of the arc-shaped sliding block, a connecting plate is hinged between the two mounting plates in each group through a second pin shaft, one side of the connecting plate is arc, a second compression spring is arranged in the spring cylinder, one end of the second compression spring is fixedly connected with one end of the slide block, the other end of the second compression spring is fixedly connected with one side of the inner wall of the spring cylinder, the other ends of the two hinge rods respectively extend into the two spring cylinders and are in sliding connection with the two spring cylinders, one ends of the two hinge rods are respectively fixedly connected with one sides of the two slide blocks, the two second compression springs are in a compressed state, a transverse plate is fixedly connected between one sides of the two mounting plates in each group, the bottom end of the transverse plate is attached to the top end of the spring cylinder, two top ends of the two supporting seats are respectively and fixedly connected with two top rods, two through holes are symmetrically and fixedly arranged on the fixing plate, the top ends of the two top rods respectively penetrate through the two top rods and are in sliding connection with the two, an opening is fixedly arranged at the center of the bottom end of the first circular ring, the width of the opening is the same as that of the trapezoidal block, a second circular ring is arranged in the first circular ring, one side of the second circular ring is fixedly connected with the side wall of the supporting plate, a PLC (programmable logic controller) is fixedly arranged on the outer wall of the first circular ring, the PLC is arranged at one side of the opening, a velometer is arranged on the side wall of the supporting plate and is arranged between the first circular ring and the second circular ring, the velometer is arranged at one side of the opening, an annular groove is arranged on the inner wall of the second circular ring, a rotating ring is connected in the annular groove in a sliding manner, four reinforcing rods are uniformly and fixedly connected on the inner wall of the rotating ring, a stabilizing sleeve is fixedly connected between the four reinforcing rods, a plurality of key grooves are uniformly arranged on the inner wall of the stabilizing sleeve in an annular manner, a rotating shaft is fixedly connected among the four inserting keys, a fixed rod is fixedly connected at one end of the rotating shaft, a counterweight cylinder is fixedly connected at the other end of the fixed rod, the counterweight cylinder is arranged between a first circular ring and a second circular ring, the diameter of the counterweight cylinder is the same as the distance between the first circular ring and the second circular ring, a bearing is embedded in the supporting plate, the other end of the rotating shaft penetrates through the bearing and is tightly attached to the bearing, a bearing plate is fixedly arranged at the other side of the supporting plate, a vertical plate is fixedly arranged at one side of the top end of the bearing plate, an electric telescopic rod is fixedly arranged at the center of one side of the vertical plate, a push plate is fixedly connected at the output end of the electric telescopic rod, two push rods are symmetrically and fixedly connected at one side of the push plate, two sliding, two gusset plates are respectively through two connecting blocks and two sliding sleeve lateral walls fixed connection, loading board top central point fixed mounting has the variable speed motor, variable speed motor output and pivot one end fixed connection, the fixed coupling has the friction ring in the pivot, the even embedding of friction ring one side has a plurality of rolling balls, and a plurality of balls one side set up with the laminating of backup pad lateral wall, the cover has swivelling joint's brake ring in the pivot, brake ring one side respectively with two push rod one end fixed connection.

Preferably, the variable speed motor is composed of a transmission and a driving motor.

Preferably, the pressure sensor, the cylinder, the PLC, the velometer, the electric telescopic rod and the variable speed motor are electrically connected with an external power supply through circuits.

Preferably, the base and the support plate are fixedly connected through welding.

Preferably, the elastic force of the second compression spring is 30-40N greater than the elastic force of the return spring.

Preferably, the velometer adopts a laser velometer with the model number of SPXc 7000.

Compared with the prior art, the invention has the beneficial effects that: this device is through being provided with variable speed motor, subassembly such as first ring sum second ring, make a counter weight section of thick bamboo can be along continuous rotation between first ring sum second ring, and along with variable speed motor's speed is different, produce different centrifugal force, thereby detect the sample, be provided with friction ring and brake ring, can play brake braking's effect, guarantee the work efficiency of this device, be provided with two arc pieces and two hinge bars, make the decline that the ladder piece can be stable, and avoid kick-backing, accomplish detection achievement like this, free fall formula detection device's area has been reduced and can be accurate, the sample is detected to minimum error, great improvement detect the degree of accuracy of data and the stability of whole device detection time measuring.

Drawings

FIG. 1 is a block diagram of the structure of the present invention;

FIG. 2 is a cross-sectional view of a structure A-A according to the present invention;

FIG. 3 is an enlarged schematic view of structure B of the present invention;

FIG. 4 is a schematic representation of the use of the structure of the present invention;

fig. 5 is a schematic diagram of the operation of the structure of the present invention.

In the figure: the device comprises a base 1, a supporting plate 2, a supporting seat 3, a cylinder 4, a fixing plate 5, a U-shaped plate 6, a detection groove 7, a pressure sensor 8, a positioning sleeve 9, a positioning rod 10, a first compression spring 11, a trapezoidal block 12, a detection block 13, an L-shaped connecting plate 14, a through groove 15, a hinge block 16, a hinge rod 17, a first pin shaft 18, a mounting plate 19, an arc block 20, an arc groove 21, an arc slide block 22, a return spring 23, a connecting plate 24, a second pin shaft 25, a connecting rod 26, a transverse plate 27, a spring cylinder 28, a slide block 29, a second compression spring 30, a top rod 31, a first circular ring 32, a PLC (programmable logic controller) 33, a velometer 34, a second circular ring 35, an annular groove 36, a rotating ring 37, a reinforcing rod 38, a stabilizing sleeve 39, a fixing rod 40, a counterweight cylinder 41, a key groove 42, an inserting key 43, a rotating shaft 44, an opening 45, Push rod 51, reinforcing plate 52, connecting block 53 and sliding

Sleeve 54, brake ring 55, variable speed motor 56, friction ring 57, balls 58, through hole 59.

Detailed Description

The invention is described in further detail below with reference to the following detailed description and accompanying drawings:

as shown in fig. 1, fig. 2, fig. 3, fig. 4 and fig. 5, a speed-adjustable centrifugal concrete hardness testing device for building construction comprises a base 1, wherein a supporting plate 2 is fixedly connected to the top end of the base 1, two supporting seats 3 are respectively and fixedly connected to two sides of the top end of the base 1, two cylinders 4 are respectively and fixedly mounted on the top ends of the two supporting seats 3, a fixing plate 5 is fixedly connected between the top ends of the two cylinders 4, a U-shaped plate 6 is fixedly mounted at the bottom end of the fixing plate 5, the U-shaped plate 6 is arranged between the two supporting seats 3, a testing groove 7 is arranged on the inner bottom surface of the U-shaped plate 6, a pressure sensor 8 is arranged on one side of the testing groove 7, the pressure sensor 8 is fixedly embedded on the inner bottom surface of the U-shaped plate 6, two positioning rods 10 are respectively and fixedly connected to, two positioning sleeves 9 which are connected in a sliding manner are respectively sleeved on two positioning rods 10, a first compression spring 11 is arranged in each positioning sleeve 9, the top end of each first compression spring 11 is fixedly connected with the bottom end of each positioning rod 10, the bottom end of each first compression spring 11 is fixedly connected with the inner bottom surface of each positioning sleeve 9, the bottom ends of the two positioning sleeves 9 are respectively fixedly connected with the top end of the base 1, a sliding-connected trapezoidal block 12 is inserted into the center of the top end of the fixing plate 5, the inclined surface of the trapezoidal block 12 is arranged upwards, the bottom end of the trapezoidal block 12 is fixedly connected with a detection block 13, the bottom end of the detection block 13 is in a conical shape, two through grooves 15 are respectively and symmetrically arranged on two sides of the top end of the fixing plate 5, two L-shaped connecting plates 14 are respectively and symmetrically and fixedly connected with the bottom end of the, two hinging blocks 16 are respectively and fixedly mounted at the top ends of the two L-shaped connecting plates 14, two hinging rods 17 are respectively hinged in the two hinging blocks 16 through two first pin shafts 18, four mounting plates 19 are respectively and fixedly mounted at two sides of the top end of the fixed plate 5, two through grooves 15 are arranged between the four mounting plates 19, the four mounting plates 19 are divided into two groups, the two mounting plates 19 of each group are symmetrically arranged, an arc block 20 is fixedly connected between the two mounting plates 19 of each group, an arc groove 21 is arranged on the inner arc wall of the arc block 20, an arc slider 22 is slidably connected in the arc groove 21, two reset springs 23 are arranged in the arc groove 21, the arc slider 22 is arranged between the two reset springs 23, two ends of the arc slider 22 are respectively and fixedly connected with one end of the two reset springs 23, and the other ends of the two reset springs 23 are respectively and fixedly connected, the connecting rod 26 is fixedly connected to the arc-shaped inner wall of the arc-shaped sliding block 22, the connecting plate 24 is hinged between the two mounting plates 19 in each group through the second pin shaft 25, one side of the connecting plate 24 is arc-shaped, the center of the outer arc wall of the connecting plate 24 is fixedly connected with one end of the connecting rod 26, the other end of the connecting plate 24 is fixedly connected with the spring barrel 28, the sliding block 29 is connected in the spring barrel 28 in a sliding manner, the second compression spring 30 is arranged in the spring barrel 28, one end of the second compression spring 30 is fixedly connected with one end of the sliding block 29, the other end of the second compression spring 30 is fixedly connected with one side of the inner wall of the spring barrel 28, the other ends of the two hinge rods 17 respectively extend into the two spring barrels 28 and are connected with the two spring barrels in a sliding manner, one end of each of the two hinge rods 17 is fixedly connected with one side, the bottom end of the transverse plate 27 is attached to the top end of the spring cylinder 28, the top ends of the two support seats 3 are fixedly connected with two push rods 31 respectively, the fixing plate 5 is symmetrically and fixedly provided with two through holes 59, the top ends of the two push rods 31 respectively penetrate through the two push rods 31 and are in sliding connection with the two push rods 31, the top ends of the two push rods 31 are attached to the bottom ends of the two spring cylinders 28 respectively, one side of the support plate 2 is fixedly provided with a first circular ring 32, the center of the bottom end of the first circular ring 32 is fixedly provided with an opening 45, the width of the opening 45 is the same as that of the trapezoidal block 12, a second circular ring 35 is arranged in the first circular ring 32, one side of the second circular ring 35 is fixedly connected with the side wall of the support plate 2, the outer wall of the first circular ring 32 is fixedly provided with a PLC controller 33, the PLC, the velometer 34 is arranged between the first circular ring 32 and the second circular ring 35, the velometer 34 is arranged at one side of the opening 45, the inner wall of the second circular ring 35 is provided with an annular groove 36, the annular groove 36 is connected with a rotating ring 37 in a sliding manner, the inner wall of the rotating ring 37 is uniformly and fixedly connected with four reinforcing rods 38, a stabilizing sleeve 39 is fixedly connected among the four reinforcing rods 38, the inner wall of the stabilizing sleeve 39 is uniformly and annularly provided with a plurality of key grooves 42, four inserting keys 43 which are clamped with the four key grooves 42 are respectively embedded in the four key grooves 42, a rotating shaft 44 is fixedly connected among the four inserting keys 43, one end of the rotating shaft 44 is fixedly connected with a fixing rod 40, the other end of the fixing rod 40 is fixedly connected with a counterweight cylinder 41, the counterweight cylinder 41 is arranged between the first circular ring 32 and the second circular ring 35, the diameter of the counterweight cylinder 41 is the same as the distance between the first, a bearing 46 is embedded in the support plate 2, the other end of the rotating shaft 44 penetrates through the bearing 46 and is tightly attached to the bearing 46, a bearing plate 47 is fixedly installed on the other side of the support plate 2, a vertical plate 48 is fixedly installed on one side of the top end of the bearing plate 47, an electric telescopic rod 49 is fixedly installed at the center of one side of the vertical plate 48, a push plate 50 is fixedly connected to the output end of the electric telescopic rod 49, two push rods 51 are symmetrically and fixedly connected to one side of the push plate 50, two sliding sleeves 54 which are in sliding connection are respectively sleeved on the two push rods 51, two reinforcing plates 52 are respectively and symmetrically and fixedly installed on the two sides of the top end of the bearing plate 47, the two reinforcing plates 52 are respectively and fixedly connected with the side walls of the two sliding sleeves 54 through two connecting blocks 53, the fixed cover of pivot 44 has been connected with friction ring 57, friction ring 57 one side evenly imbeds and has a plurality of rolling balls 58, and a plurality of balls 58 one side and the laminating of backup pad 2 lateral wall set up, the cover has swivelling joint's brake ring 55 in the pivot 44, brake ring 55 one side respectively with two push rod 51 one end fixed connection.

The variable speed motor 56 is composed of a transmission and a drive motor.

The pressure sensor 8, the cylinder 4, the PLC 33, the velometer 34, the electric telescopic rod 49 and the variable speed motor 56 are all electrically connected with an external power supply through circuits.

The base 1 is fixedly connected with the supporting plate 2 through welding.

The elastic force of the second compression spring 30 is greater than the elastic force of the return spring 23 by 30-40N.

The velometer 34 is a laser velometer with the model number of SPXc 7000.

The working principle is as follows: when the device needs to be used, the device is firstly placed in a working area, then the power supply for driving the device is switched on, so that the device is in a standby state, and then the device can normally work, at this time, as shown in fig. 1, a sample (a dotted line rectangle below a detection block 13) is placed on the inner bottom surface of a U-shaped plate 6, at this time, because the device is driven to be electrified, the variable speed motor 56 is started, the variable speed motor 56 starts to rotate in an accelerated manner, the output end of the variable speed motor 56 drives the rotating shaft 44 to rotate in an accelerated manner, on one hand, the rotating shaft 44 is sleeved with the stabilizing sleeve 39, the inner wall of the stabilizing sleeve 39 is provided with four key slots 42, and the rotating shaft 44 is fixedly connected with four inserting keys 43, so that the four inserting keys 43 and the four key slots 42 form a clamping manner, so that the stabilizing sleeve 39 can also rotate, and on the other hand, the outer wall of the friction ring 57 is embedded with a plurality of balls 58, so that friction between the friction ring 57 and the support plate 2 is reduced, the support plate 2 is internally provided with a bearing 46, so that the rotating shaft 44 can stably rotate, the outer wall of the stabilizing sleeve 39 is fixedly connected with a plurality of reinforcing rods 38, the plurality of reinforcing rods 38 are jointly sleeved with a rotating ring 37, the rotating ring 37 is in sliding connection in the annular groove 36, so that the stabilizing sleeve 39 can stably rotate, after the stabilizing sleeve 39 rotates, the fixing rod 40 drives the counterweight cylinder 41 to rotate, a counterweight block with fixed weight is placed in the counterweight cylinder 41, the counterweight cylinder 41 can slowly rotate with acceleration along with the acceleration rotation of the variable speed motor 56, and at the same time, stronger and stronger centrifugal force (the centrifugal force formula is F ma, wherein m is the mass of the object, a is centripetal acceleration, and the centripetal acceleration is changed because the constant acceleration of the variable speed motor 56, therefore, the centrifugal force is increasingly greater), when the speed of the variable speed motor 56 reaches the detection speed standard, the speed detector 34 can monitor the speed, when the speed reaches the standard, the speed detector 34 transmits a signal to the PLC controller 33, the PLC controller 33 sends a command to the two cylinders 4, so that the two cylinders 4 start to start, the fixing plate 5 is driven to rapidly ascend, the trapezoidal block 12 is rapidly inserted into the opening 45, at this time, as shown in fig. 4 and 5, the two push rods 31 slide out at the two through holes 59, and the top ends of the push rods are no longer attached to the bottom ends of the two spring cylinders 28, so that when the counterweight cylinder 41 rotates to the position of the trapezoidal block 12, the counterweight cylinder touches the inclined surface of the trapezoidal block 12, pressure is applied to the trapezoidal block 12, the trapezoidal block 12 rapidly moves downwards, the sharp bottom end of the detection block 13 is attached to the sample surface, thus the detection is completed, when the, when moving downwards, the two hinged rods 17 are inclined (refer to fig. 5), because the two connecting plates 24 are hinged with the two sets of mounting plates 19 through the two second pins 25, and the two connecting plates 24 are connected with the two spring cartridges 28, the second compression spring 30 is arranged in the spring cartridge 28, when the hinged rods 17 are inclined, the elastic force of the second compression spring 30 is released, so that the stress direction of the hinged rods 17 is changed from horizontal to inclined downwards, the other side of the hinged rods 17 is connected with the arc-shaped slide block 22 through the connecting rod 26, the arc-shaped slide block 22 slides in the arc-shaped groove 21 to play a role of limiting and guiding, and the elastic force of the reset spring 23 in the arc-shaped groove 21 is small, so that the trapezoidal block 12 always has a downward force, the trapezoidal block 12 is prevented from being reset and extending into the opening 45 again, when the sample is stressed and detected, the pressure is transmitted to the pressure sensor 8 embedded on the inner bottom surface of the U-shaped plate 6, the pressure sensor 8 is arranged at one side of the detection groove 7, so that the damage of the pressure sensor is avoided, after the pressure sensor 8 senses the pressure, a signal is transmitted to the electric telescopic rod 49 and the speed change motor 56, on one hand, the speed change motor 56 stops rotating, but the counterweight cylinder 41 rotates due to inertia thereof, on the other hand, after the electric telescopic rod 49 receives the signal, the electric telescopic rod 49 starts to extend, so that one side of the brake ring 55 can be uniformly and stably attached to one side of the friction ring 57 through the two push rods 51, the brake effect is achieved, in addition, two reinforcing plates 52 are arranged at two sides of the top end of the bearing plate 47, the two reinforcing plates 52 are connected with two sliding sleeves 54 through two connecting blocks 53, the stabilizing and limiting effects can be achieved on the two push rods 51, the torque generated between the push plates 50 and the push rods 51 due to the rotating speed is prevented, and the, thus, under the action of the active brake, the counterweight cylinder 41 can be braked quickly, the next detection can be carried out quickly, the working efficiency of the device is well ensured, after the detection is finished, the two air cylinders 4 are started manually at the moment, the fixing plate 5 is lowered, because the trapezoidal blocks 12 are respectively hinged with the two hinged rods 17 through the two hinged blocks 16 at the top ends of the two L-shaped connecting plates 14, the device can work normally, after the trapezoidal blocks are lowered to a certain degree, the two ejector rods 31 extend into the two through holes 59 again and are contacted with the bottom end of the spring cylinder 28 in an inclined state again, after the resetting is finished, because the ejector rods 31 are fixed, the two spring cylinders 28 are restored to the original positions, the two transverse plates 27 are arranged to prevent the upward displacement, and the first compression springs 11 in the positioning sleeves 9 are always in a compressed state, and upward jacking force is continuously provided for the positioning rod 10, so that the pressure on the U-shaped plate 6 during detection can be relieved, and the U-shaped plate is prevented from being deformed or damaged.

This device is through being provided with variable speed motor 56, subassembly such as first toroidal ring 32 and second toroidal ring 35, make a counter weight section of thick bamboo 41 can be along continuous rotation between first toroidal ring 32 and the second toroidal ring 35, and along with variable speed motor 56's speed is different, produce different centrifugal force, thereby detect the sample, be provided with friction ring 57 and brake ring 55, can play brake braking's effect, guarantee the work efficiency of this device, be provided with two arc blocks 20 and two articulated rods 17, make descending that ladder-shaped block 12 can be stable, and avoid kick-backing, accomplish detection achievement like this, free fall formula detection device's area has been reduced and can be accurate, the sample of minimum error is detected, great improvement the degree of accuracy of detected data and the stability that whole device detected time measuring.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a centrifugal concrete hardness detection device of adjustable speed for construction, includes base (1), base (1) top fixedly connected with backup pad (2), its characterized in that: the device is characterized in that two supporting seats (3) are fixedly connected to two sides of the top end of the base (1) respectively, two cylinders (4) are fixedly mounted at the top ends of the two supporting seats (3) respectively, a fixing plate (5) is fixedly connected between the top ends of the two cylinders (4), a U-shaped plate (6) is fixedly mounted at the bottom end of the fixing plate (5), the U-shaped plate (6) is arranged between the two supporting seats (3), a detection groove (7) is formed in the inner bottom surface of the U-shaped plate (6), a pressure sensor (8) is arranged on one side of the detection groove (7), the pressure sensor (8) is fixedly embedded in the inner bottom surface of the U-shaped plate (6), two positioning rods (10) are fixedly connected to two sides of the bottom end of the U-shaped plate (6) respectively, two positioning sleeves (9) which are in sliding connection are, the top end of the first compression spring (11) is fixedly connected with the bottom ends of the positioning rods (10), the bottom end of the first compression spring (11) is fixedly connected with the inner bottom surfaces of the positioning sleeves (9), the bottom ends of the two positioning sleeves (9) are respectively fixedly connected with the top end of the base (1), a sliding-connected trapezoidal block (12) is inserted into the center of the top end of the fixing plate (5), the inclined surface of the trapezoidal block (12) is arranged upwards, the bottom end of the trapezoidal block (12) is fixedly connected with a detection block (13), the bottom end of the detection block (13) is in a conical shape, two through grooves (15) are respectively and symmetrically arranged on two sides of the top end of the fixing plate (5), two L-shaped connecting plates (14) are respectively and symmetrically and fixedly connected with the bottom end of the outer wall of the trapezoidal block (12), the top ends of the two L-shaped connecting plates (14) respectively penetrate through the two through grooves (15), two hinged rods (17) are respectively hinged in the two hinged blocks (16) through two first pin shafts (18), four mounting plates (19) are respectively and fixedly mounted on two sides of the top end of the fixed plate (5), two through grooves (15) are arranged between the four mounting plates (19), the four mounting plates (19) are divided into two groups, the two mounting plates (19) of each group are symmetrically arranged, an arc block (20) is fixedly connected between the two mounting plates (19) in each group, an arc groove (21) is arranged on the inner arc wall of the arc block (20), an arc sliding block (22) is slidably connected in the arc groove (21), two reset springs (23) are arranged in the arc groove (21), the arc sliding block (22) is arranged between the two reset springs (23), two ends of the arc sliding block (22) are respectively and fixedly connected with one ends of the two reset springs (23), the other ends of the two reset springs (23) are respectively fixedly connected with the two inner walls of the arc-shaped groove (21), the arc-shaped inner wall of the arc-shaped sliding block (22) is fixedly connected with a connecting rod (26), a connecting plate (24) is hinged between the two mounting plates (19) in each group through a second pin shaft (25), one side of the connecting plate (24) is arc-shaped, the central part of the outer arc wall of the connecting plate (24) is fixedly connected with one end of the connecting rod (26), the other end of the connecting plate (24) is fixedly connected with a spring cylinder (28), a sliding block (29) is slidably connected in the spring cylinder (28), a second compression spring (30) is arranged in the spring cylinder (28), one end of the second compression spring (30) is fixedly connected with one end of the sliding block (29), the other end of the second compression spring (30) is fixedly connected with one side of the inner wall of the spring cylinder (28), and the other ends of the two hinge rods, one end of each of the two hinge rods (17) is fixedly connected with one side of each of the two sliding blocks (29), each of the two second compression springs (30) is in a compressed state, a transverse plate (27) is fixedly connected between one side of each of the two mounting plates (19) in each group, the bottom end of the transverse plate (27) is attached to the top end of the spring barrel (28), the top ends of the two support seats (3) are fixedly connected with two ejector rods (31), the fixing plate (5) is symmetrically and fixedly provided with two through holes (59), the top ends of the two ejector rods (31) respectively penetrate through and are slidably connected with the two ejector rods (31), the top ends of the two ejector rods (31) are respectively attached to the bottom ends of the two spring barrels (28), one side of the support plate (2) is fixedly provided with a first circular ring (32), the center of the bottom end of the first circular ring (32) is fixedly provided with an opening (45), a second circular ring (35) is arranged in the first circular ring (32), one side of the second circular ring (35) is fixedly connected with the side wall of the support plate (2), a PLC (programmable logic controller) (33) is fixedly installed on the outer wall of the first circular ring (32), the PLC (33) is arranged on one side of an opening (45), a velometer (34) is arranged on the side wall of the support plate (2), the velometer (34) is arranged between the first circular ring (32) and the second circular ring (35), the velometer (34) is arranged on one side of the opening (45), an annular groove (36) is arranged on the inner wall of the second circular ring (35), a rotating ring (37) is connected in the annular groove (36) in a sliding manner, four reinforcing rods (38) are uniformly and fixedly connected on the inner wall of the rotating ring (37), and a stabilizing sleeve (39) is fixedly connected among the four reinforcing rods (38), stabilize annular evenly and be provided with a plurality of keyways (42) on sleeve (39) inner wall, four keyways (42) in imbed respectively four and insert key (43) rather than the block, four fixedly connected with pivot (44) between inserting key (43), pivot (44) one end fixedly connected with dead lever (40), dead lever (40) other end fixedly connected with counter weight section of thick bamboo (41), counter weight section of thick bamboo (41) set up between first circular ring (32) and second circular ring (35), counter weight section of thick bamboo (41) diameter is the same with distance between first circular ring (32) and the second circular ring (35), the embedding has bearing (46) in backup pad (2), the pivot (44) other end passes bearing (46) and closely laminates the setting rather than it, backup pad (2) opposite side fixed mounting has loading board (47), loading board (47) top one side fixed mounting has riser (48), an electric telescopic rod (49) is fixedly installed at the center of one side of the vertical plate (48), a push plate (50) is fixedly connected at the output end of the electric telescopic rod (49), two push rods (51) are symmetrically and fixedly connected to one side of the push plate (50), two sliding sleeves (54) in sliding connection are sleeved on the two push rods (51) respectively, two reinforcing plates (52) are symmetrically and fixedly installed on two sides of the top end of the bearing plate (47) respectively, the two reinforcing plates (52) are fixedly connected with the side walls of the two sliding sleeves (54) through two connecting blocks (53) respectively, a variable speed motor (56) is fixedly installed at the center of the top end of the bearing plate (47), the output end of the variable speed motor (56) is fixedly connected with one end of a rotating shaft (44), a friction ring (57) is fixedly sleeved on the rotating shaft (44), and a plurality of rolling balls, one side of each ball (58) is attached to the side wall of the support plate (2), a brake ring (55) which is connected in a rotating mode is sleeved on the rotating shaft (44), and one side of each brake ring (55) is fixedly connected with one end of each push rod (51).

2. The speed-adjustable centrifugal concrete hardness detection device for building construction according to claim 1, characterized in that: the speed change motor (56) consists of a speed changer and a driving motor.

3. The speed-adjustable centrifugal concrete hardness detection device for building construction according to claim 1, characterized in that: the pressure sensor (8), the cylinder (4), the PLC (33), the velometer (34), the electric telescopic rod (49) and the variable speed motor (56) are electrically connected with an external power supply through circuits.

4. The speed-adjustable centrifugal concrete hardness detection device for building construction according to claim 1, characterized in that: the base (1) is fixedly connected with the supporting plate (2) through welding.

5. The speed-adjustable centrifugal concrete hardness detection device for building construction according to claim 1, characterized in that: the elasticity of the second compression spring (30) is 30-40N greater than that of the return spring (23).

6. The speed-adjustable centrifugal concrete hardness detection device for building construction according to claim 1, characterized in that: the velometer (34) adopts a laser velometer with the model number of SPXc 7000.