CN112781973A

CN112781973A - Building material hardness detection equipment

Info

Publication number: CN112781973A
Application number: CN202011641817.9A
Authority: CN
Inventors: 卓菁
Original assignee: Wenzhou Polytechnic
Current assignee: Wenzhou Polytechnic
Priority date: 2020-12-31
Filing date: 2020-12-31
Publication date: 2021-05-11

Abstract

The invention discloses a building material hardness detection device which comprises a rack, a workbench, a lifting frame, a lifting mechanism and a mounting frame, wherein two ends of the mounting frame are respectively connected with the lifting frame through an overload protection mechanism, a pressure sensor is connected below the mounting frame, a fixing piece is connected below the pressure sensor, a pressure head is connected below the fixing piece, the overload protection mechanism comprises a bottom plate, a workpiece, a reset component, a pair of floating components and a pair of resistance increasing components, the bottom plate is fixedly arranged on the lifting frame, the workpiece is fixedly arranged on the bottom plate, a pair of extension rods connected with the end part of the mounting frame respectively abut against two side walls of a vertical column part of the workpiece, the pair of floating components are symmetrically and slidably arranged on two sides of the workpiece, the pair of resistance increasing components correspond to the pair of floating components one to one, and the reset components are used for resetting the. When the pressure is overlarge, the pair of overload protection mechanisms can act to enable the installation rack to move upwards relative to the lifting rack, and the overload protection effect is achieved on the parts of the equipment.

Description

Building material hardness detection equipment

Technical Field

The invention relates to the technical field of building material detection equipment, in particular to building material hardness detection equipment.

Background

In the construction of building engineering, many building materials are required, the hardness quality requirements of some building materials are strict, and the hardness quality detection of the materials is required before the construction so as to achieve the purpose of safe use of the building materials.

At present, building material hardness detection equipment is adopted for detecting building materials, the existing building material hardness detection equipment usually places the building materials on a workbench, then a pressure head moves downwards to detect the hardness of a sample, when the detection is carried out, an event that the detection equipment has overlarge pressure due to faults can occur, the detection equipment is damaged due to overlarge pressure, and therefore the existing building material hardness detection equipment needs to be improved.

Disclosure of Invention

In view of the above, the present invention provides a building material hardness detection apparatus to solve the above technical problem, so that the apparatus plays a role of overload protection when the pressure is too large due to a failure.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a building material hardness detection equipment, includes frame, workstation, crane and elevating system, the workstation sets up in the frame, elevating system is used for controlling the lift of crane still includes the mounting bracket, the both ends of mounting bracket respectively through overload protection mechanism with the crane is connected, the below of mounting bracket is connected with pressure sensor, pressure sensor's below is connected with the mounting, the below of mounting is connected with the pressure head, the pressure head is located the top of mounting, overload protection mechanism includes bottom plate, worker's type spare, reset assembly, a pair of float spare and a pair of resistance increasing subassembly, the bottom plate is adorned admittedly on the crane, worker's type spare sets firmly on the bottom plate, a pair of extension rod of the end connection of mounting bracket supports respectively and leans on the both sides wall of the upright post portion of worker's spare, the pair of floating parts are symmetrically arranged on two sides of the workpiece in a sliding mode, the resistance increasing assemblies correspond to the floating parts one to one, the extending rods are limited to correspond to the lower sides of the floating parts and the lower platform portions of the workpiece under the action of the resistance increasing assemblies, when pressure is too large, the extending rods can overcome the corresponding resistance of the resistance increasing assemblies to push the corresponding floating parts to move to correspond to the upper sides of the floating parts and the upper platform portions of the workpiece, and the reset assemblies are used for resetting the overload protection mechanism.

Further, install a protective housing on the bottom plate, wearing out of worker's type spare the protective housing supports and leans on the terminal surface of mounting bracket, the extension rod passes the protective housing to extend in the protective housing.

Furthermore, the floating piece comprises an arc-shaped part and a pair of end parts, the outer arc surface of the arc-shaped part is abutted against the extension rod, the end parts are connected to two ends of the arc-shaped part respectively, guide rods in one-to-one correspondence with the end parts are arranged on the bottom plate, and the end parts are slidably sleeved on the corresponding guide rods.

Furthermore, the resistance-increasing assembly comprises a first rack, a first gear, a first winding drum, a second rack, a second gear, a second winding drum, a first pull rope, a second pull rope, a tension spring, a first slider and a second slider, wherein the first rack and the second rack are connected to the inner arc surface of the arc-shaped portion and are arranged in parallel, the first gear is rotatably arranged on the bottom plate, the first gear is meshed with the first rack, the second gear is rotatably arranged on the bottom plate, the second gear is meshed with the second rack, the first winding drum is coaxially connected with the first gear, the second winding drum is coaxially connected with the second gear, the rotation directions of the first winding drum and the second winding drum are opposite, and a first guide pillar, a second guide pillar and a second guide pillar are arranged on the bottom plate, The first sliding block and the second sliding block are arranged on the bottom plate in a sliding mode, the extension spring is connected between the first sliding block and the second sliding block, one end of the first pull rope is connected with the first reel, the other end of the first pull rope sequentially bypasses a fifth guide pillar on the first guide pillar and the first sliding block and then is connected with the second guide pillar, one end of the second pull rope is connected with the second reel, and the other end of the second pull rope sequentially bypasses a sixth guide pillar on the fourth guide pillar and the second sliding block and then is connected with the third guide pillar.

Furthermore, the first sliding block and the second sliding block are sleeved on the sliding rod arranged on the bottom plate in a sliding mode.

Further, the subassembly that resets includes third rack, fourth rack, third gear and electric telescopic handle, the third rack with one the floating piece is connected, the fourth rack with another the floating piece is connected, the third rack with the parallel and relative setting of fourth rack, the third gear rotates and sets up the third rack with between the fourth rack, just the third gear simultaneously with the third rack with fourth rack meshes mutually, electric telescopic handle sets up on the bottom plate, electric telescopic handle's output passes the protective housing outwards extends, the extension rod of connecting on the fourth rack passes the protective housing outwards extends, just the extension rod with electric telescopic handle's output can be dismantled and be connected.

Furthermore, the extension rod is provided with a pin hole, the output end of the electric telescopic rod is connected with a connecting block, the connecting block is in threaded connection with a connecting screw, and a pin rod on the connecting screw can be inserted into the pin hole.

Further, overload protection mechanism still includes a pair of buffering subassembly, and is a pair of buffering subassembly symmetric connection is in the below of upper platform portion, the buffering subassembly includes push pedal, compression spring, telescopic cylinder and telescopic link, telescopic cylinder's upper end with upper platform portion connects, the telescopic link is flexible to be set up in the telescopic cylinder, telescopic cylinder's lower extreme with the push pedal is connected, the compression spring cover is established telescopic cylinder with the outside of telescopic link, just compression spring's one end supports and presses on the lower surface of upper platform portion, compression spring's the other end supports and presses in on the push pedal.

Further, elevating system includes motor, driving pulley, drive belt, a pair of driven pulleys, a pair of lead screw and a pair of nut, the motor sets up in the frame, driving pulley with the motor is connected, the drive belt cover is established driving pulley and a pair of driven pulleys are last, and is a pair of the equal vertical rotation of lead screw sets up in the frame, a pair of driven pulleys respectively with a pair of the lead screw is connected, a pair of the nut respectively with a pair of lead screw threaded connection, the nut with crane fixed connection.

The technical scheme can show that the invention has the advantages that: in the use, when equipment takes place the pressure when too big because of accident or trouble, a pair of overload protection mechanism can play a role, makes the relative crane rebound of mounting bracket, plays overload protection's effect to the spare part of equipment.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.

FIG. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic diagram of the internal structure of the overload protection mechanism of the present invention.

Fig. 3 is an enlarged view of a point a in fig. 2.

Fig. 4 is an enlarged view of fig. 2 at B.

Fig. 5 is an enlarged view at C in fig. 2.

List of reference numerals: the device comprises a frame 1, a base 11, a side plate 12, a top plate 13, a support plate 14, a workbench 2, a coaming 21, a pressure head 3, a fixing piece 4, a pressure sensor 5, a mounting rack 6, an extension rod 61, a trigger rod 62, a lifting rack 7, a vertical plate part 71, an overload protection mechanism 8, a bottom plate 81, an I-shaped piece 82, an upper platform part 821, a column part 822, a lower platform part 823, a floating piece 83, an arc-shaped part 831, an end part 832, a resistance-increasing component 84, a first rack 841, a first gear 8411, a first reel 8412, a second rack 842, a second gear 8421, a second reel 8422, a first pull rope 843, a second pull rope 8431, a tension spring 844, a first guide pillar 8451, a second guide pillar 8452, a first sliding block 8453, a second sliding block 8454, a third guide pillar 8455, a fourth guide pillar 8456, a sliding rod 846, a reset component 85, a third rack 851, a fourth rack 852, a third gear 853, an electric telescopic rod 854, an extension rod, The device comprises a connecting block 856, a connecting screw 857, a pin 8571, a buffer assembly 86, a push plate 861, a compression spring 862, a telescopic cylinder 863, a telescopic rod 864, a guide rod 87, a protective shell 88, a proximity switch 89, a lifting mechanism 9, a motor 91, a driving pulley 92, a transmission belt 93, a driven pulley 94, a screw rod 95 and a nut 96.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the following embodiments and accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.

Referring to fig. 1 to 5, the building material hardness detecting apparatus shown in fig. 1 comprises a frame 1, a workbench 2, a mounting frame 6, a lifting frame 7 and a lifting mechanism 9, wherein the frame 1 comprises a base 11, a top plate 13 arranged above the base 11 and a pair of side plates 12 connected between the top plate 13 and the base 11, a support plate 14 is respectively arranged in the middle of one side of each pair of side plates 12, the workbench 2 is arranged on the base 11 of the frame 1, the lifting mechanism 9 is arranged on the frame 1 for controlling the lifting of the lifting frame 7, an overload protection mechanism 8 is respectively arranged on a pair of vertical plate parts 71 at the lower part of the lifting frame 7, a pair of extension rods 61 extending along the horizontal direction are respectively arranged at two ends of the mounting frame 6, two pairs of extension rods 61 are respectively matched with the two overload protection mechanisms 8 in a one-to-one correspondence manner, a pressure sensor 5 is connected below the mounting frame 6, a fixing member 4 is, the lower part of the fixing part 4 is connected with a pressure head 3, and the pressure head 3 is positioned above the fixing part 4.

As shown in fig. 1, the lifting mechanism 9 includes a motor 91, a driving pulley 92, a transmission belt 93, a pair of driven pulleys 94, a pair of lead screws 95 and a pair of nuts 96, the motor 91 is disposed on the top plate 13, an output shaft of the motor 91 downwardly passes through the top plate 13 to be connected with the driving pulley 92, the pair of lead screws 95 are respectively vertically and rotatably disposed between the pair of support plates 14 and the top plate 13, the pair of driven pulleys 94 are respectively and correspondingly connected with the pair of lead screws 95, the transmission belt 93 is sleeved on the driving pulley 92 and the pair of driven pulleys 94, the pair of nuts 96 are respectively and fixedly connected with two ends of the lifting frame 7, and the pair of nuts 96 are respectively, when the motor 91 works, the motor 91 drives the pair of screw rods 95 to rotate through the driving belt pulley 92, the transmission belt 93 and the pair of driven belt pulleys 94, and then the pair of screw rods 95 drives the lifting frame 7 to ascend or descend through the pair of nuts 96.

As shown in fig. 2, the overload protection mechanism 8 includes a bottom plate 81, an i-shaped member 82, a reset assembly 85, a pair of floating members 83 and a pair of resistance increasing assemblies 84, the bottom plate 81 is fixedly mounted on the vertical plate portion 71 of the crane 7, a protection shell 88 is mounted on the bottom plate 81, the i-shaped member 82 is fixedly mounted on the bottom plate 81, the i-shaped member 82 penetrates through the protection shell 88 and abuts against an end surface of the mounting frame 6, the i-shaped member 82 includes a column portion 822, an upper platform portion 821 connected to an upper end of the column portion 822 and a lower platform portion 823 connected to a lower end of the column portion 822, a pair of extension rods 61 connected to an end of the mounting frame 6 penetrate through the protection shell 88 and extend into the protection shell 88 and respectively abut against two side walls of the column portion 822 of the i-shaped member 82, the pair of floating members 83 are symmetrically and slidably disposed on left and right sides of the i-shaped member 82, a pair of end heads 832 are respectively connected with two ends of the arc-shaped part 831, guide rods 87 which are in one-to-one correspondence with the end heads 832 are arranged on the bottom plate 81, the end heads 832 are slidably sleeved on the corresponding guide rods 87, the resistance increasing assemblies 84 are arranged on the bottom plate 81, the pair of resistance increasing assemblies 84 are in one-to-one correspondence with the pair of floating pieces 83, the floating piece 83 is abutted against the upright part 822 of the I-shaped piece 82 under the action of the resistance-increasing component 84, the extension rod 61 is abutted against the upper surface of the lower platform part 823 of the I-shaped piece 82 under the action of gravity, while the extension rod 61 is restrained to the lower side of the corresponding floating member 83, when excessive pressure occurs, the extension rod 61 presses the float member 83, causing the float member 83 to move against the resistance of the corresponding resistance increasing assembly 84, the extension rod 61 is then moved between the upper side of the corresponding float 83 and the upper platform 821 of the drum 82, and the reset assembly 85 is used to reset the overload protection mechanism 8.

As shown in fig. 3, the resistance increasing assembly 84 includes a first rack 841, a first gear 8411, a first reel 8412, a second rack 842, a second gear 8421, a second reel 8422, a first pull rope 843, a second pull rope 8431, a tension spring 844, a first slider 8453 and a second slider 8454, the first rack 841 and the second rack 842 are both connected to an inner arc surface of the arc-shaped portion 831, the first rack 841 and the second rack 842 are arranged in parallel, the first gear 8411 is rotatably arranged on the base plate 81, the first gear 8411 is engaged with the first rack 841, the second gear 8421 is rotatably arranged on the base plate 81, the second gear 8421 is engaged with the second rack 842, the first reel 8412 is coaxially connected with the first gear 8411, the second reel 8422 is coaxially connected with the second gear 8421, the first reel 8412 is opposite to the second reel 8422 in rotation, a first guide post 8451, a second guide post 8452, a third guide post 8456 and a fourth guide post 8456 are arranged on the base plate 81, the first slider 8453 and the second slider 8454 are slidably sleeved on a sliding rod 846 arranged on the base plate 81, the extension spring 844 is connected between the first slider 8453 and the second slider 8454, one end of the first pull rope 843 is connected with the first reel 8412, the other end of the first pull rope 843 sequentially rounds a first guide pillar 8451 and a fifth guide pillar on the first slider 8453 and then is connected with the second guide pillar 8452, one end of the second pull rope 8431 is connected with the second reel 8422, the other end of the second pull rope 8431 sequentially rounds a fourth guide pillar 8456 and a sixth guide pillar on the second slider 8454 and then is connected with the third guide pillar 8455, when the floating member 83 is extruded and moved, the first rack 841 and the second rack 842 respectively drive the first gear 8411 and the second gear 8421 to rotate, further the first reel 8411 drives the first reel 8412 to rotate, the second gear 8421 drives the second reel 8422 to rotate, so that the first reel 8412 winds up the first pull rope 843, the second reel 8422 winds the second pulling rope 8431, so that the first pulling rope 843 and the second pulling rope 8431 can drive the first slider 8453 and the second slider 8454 to move to enable the first slider 8453 and the second slider 8454 to be away from each other, the extension spring 844 is extended, after an external force acting on the floating piece 83 is eliminated, under the action of the extension spring 844, the first slider 8453 and the second slider 8454 are drawn close to each other, the first pulling rope 843 drives the first reel 8412 to rotate, the second pulling rope 8431 drives the second reel 8422 to rotate, the first reel 8412 and the second reel 8422 respectively drive the first gear 8411 and the second gear 8421 to rotate, the first rack 841 and the second rack 842 are driven by the first gear 8411 and the second gear 8421 to enable the floating piece 83 to reversely move and reset, and until the outer portion 831 of the floating piece 83 abuts against the upright 822 portion of the arc-shaped workpiece 82.

As shown in fig. 2 and 5, the resetting assembly 85 includes a third rack 851, a fourth rack 852, a third gear 853 and an electric telescopic rod 854, the left end of the third rack 851 is connected to the lower end of the floating member 83 located on the left side by a first connecting rod, the right end of the fourth rack 852 is connected to the lower end of the floating member 83 located on the right side by a second connecting rod, the third rack 851 and the fourth rack 852 are arranged in parallel and opposite to each other, the third gear 853 is rotatably arranged on the bottom plate 81, the third gear 853 is located between the third rack 851 and the fourth rack 852, the third gear 853 is simultaneously engaged with the third rack 851 and the fourth rack 852, an extension rod 855 connected to the left end of the fourth rack 852 extends outwards through the protective shell 88, a pin hole 8551 is arranged on the left end of the extension rod 855, the electric telescopic rod 854 is arranged on the bottom plate 81, and the output end of the electric telescopic rod 854 penetrates the protective shell 88 leftwards, a connecting block 856 is connected to the output end of the electric, a connecting screw 857 is connected to the connecting block 856 through a thread, a pin rod 8571 is connected to the upper end of the connecting screw 857, the pin rod 8571 can be inserted into the pin hole 8551, when the overload protection mechanism 8 is reset, the connecting screw 857 is screwed so that the pin rod 8571 is inserted into the pin hole 8551, then the electric telescopic rod 854 is shortened to drive the fourth rack 852 to move rightwards, the fourth rack 852 drives the fourth rack 852 to move leftwards through the third gear 853, so that the floating member 83 on the right side moves rightwards, the floating member 83 on the left side moves leftwards, and a channel is formed between the floating member 83 and the upright 822 of the I-shaped member 82, at this time, under the action of gravity, the extending rod 61 moves downwards to reset, and after the overload protection mechanism 8 is reset, an operator screws the connecting screw 857 so that the pin rod 8571 is.

As shown in fig. 1, a proximity switch 89 is arranged on the workpiece 82 of the overload protection mechanism 8 on the right side, a trigger rod 62 matched with the proximity switch 89 is arranged on the top of the mounting frame 6, and when the trigger rod 62 moves up to the sensing surface of the proximity switch 89 along with the mounting frame 6 relative to the lifting frame 7, the proximity switch 89 senses the trigger rod 62 and feeds a sensing signal back to the building material hardness detection device, so that the building material hardness detection device stops working.

As shown in fig. 2 and 4, the overload protection mechanism 8 further includes a pair of buffer assemblies 86, the pair of buffer assemblies 86 are symmetrically connected below the upper platform portion 821, each buffer assembly 86 includes a push plate 861, a compression spring 862, a telescopic cylinder 863 and a telescopic rod 864, an upper end of the telescopic cylinder 863 is connected with the upper platform portion 821, the telescopic rod 864 is telescopically disposed in the telescopic cylinder 863, a lower end of the telescopic cylinder 863 is connected with the push plate 861, the compression spring 862 is sleeved outside the telescopic cylinder 863 and the telescopic rod 864, one end of the compression spring 862 abuts against a lower surface of the upper platform portion 821, the other end of the compression spring 862 abuts against the push plate 861, when the extension rod 61 moves to an upper side of the floating member 83, the extension rod 61 pushes the push plate 861 to move upward, so that the compression spring 862 is compressed, and the buffer assemblies 86 can play a role in buffering.

As shown in fig. 1, the top of workstation 2 is all provided with bounding wall 21 on all around to avoid detecting the piece of the broken production of sample to splash, in addition, the bounding wall 21 that is located workstation 2 front side can be opened and close, makes things convenient for the measurement personnel to get and puts the measurement sample.

As shown in figure 1, in the use process of the building material hardness detection equipment, when the pressure of the equipment is too high due to accidents or faults, a pair of overload protection mechanisms 8 can act to enable the installation frame 6 to move upwards relative to the lifting frame 7, and the overload protection effect on parts of the equipment is achieved.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made to the embodiment of the present invention by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The building material hardness detection equipment comprises a rack (1), a workbench (2), a lifting frame (7) and a lifting mechanism (9), wherein the workbench (2) is arranged on the rack (1), the lifting mechanism (9) is used for controlling the lifting frame (7) to lift, the building material hardness detection equipment is characterized by further comprising an installation frame (6), two ends of the installation frame (6) are connected with the lifting frame (7) through overload protection mechanisms (8), pressure sensors (5) are connected below the installation frame (6), fixing pieces (4) are connected below the pressure sensors (5), pressure heads (3) are connected below the fixing pieces (4), the pressure heads (3) are located above the fixing pieces (4), and the overload protection mechanisms (8) comprise bottom plates (81), I-shaped pieces (82), reset components (85), The lifting frame is characterized by comprising a pair of floating pieces (83) and a pair of resistance increasing components (84), the base plate (81) is fixedly arranged on the lifting frame (7), the I-shaped piece (82) is fixedly arranged on the base plate (81), a pair of extension rods (61) connected with the end of the mounting frame (6) are abutted to two side walls of an upright post part (822) of the I-shaped piece (82) respectively, the pair of floating pieces (83) are symmetrically arranged on two sides of the I-shaped piece (82) in a sliding manner, the pair of resistance increasing components (84) are in one-to-one correspondence with the pair of floating pieces (83), the extension rods (61) are limited between the lower sides of the corresponding floating pieces (83) and lower platform parts (823) of the I-shaped piece (82) under the action of the resistance increasing components (84), and when the pressure is too high, the extension rods (61) can overcome the resistance of the corresponding resistance increasing components (84) to push the corresponding floating pieces (83) to move (83) so as to move to the corresponding floating pieces (84) 83) And an upper platform part (821) of the workpiece (82), the reset component (85) is used for resetting the overload protection mechanism (8).

2. The building material hardness detection device according to claim 1, wherein a protective shell (88) is mounted on the bottom plate (81), the I-shaped piece (82) penetrates out of the protective shell (88) and abuts against the end face of the mounting frame (6), and the extension rod (61) penetrates through the protective shell (88) and extends into the protective shell (88).

3. The building material hardness detection device according to claim 2, wherein the floating member (83) comprises an arc-shaped portion (831) and a pair of end portions (832), an outer arc surface of the arc-shaped portion (831) abuts against the extension rod (61), the pair of end portions (832) are respectively connected to two ends of the arc-shaped portion (831), guide rods (87) corresponding to the end portions (832) in a one-to-one mode are arranged on the base plate (81), and the end portions (832) are slidably sleeved on the corresponding guide rods (87).

4. The building material hardness detecting apparatus according to claim 3, wherein the resistance increasing assembly (84) includes a first rack (841), a first gear (8411), a first reel (8412), a second rack (842), a second gear (8421), a second reel (8422), a first pulling rope (843), a second pulling rope (8431), a tension spring (844), a first slider (8453) and a second slider (8454), the first rack (841) and the second rack (842) are both connected on an inner arc surface of the arc portion (831), the first rack (841) and the second rack (842) are arranged in parallel, the first gear (8411) is rotatably arranged on the bottom plate (81), the first gear (8411) is engaged with the first rack (841), the second gear (8421) is rotatably arranged on the bottom plate (81), the second gear (8421) is engaged with the second rack (842), the first reel (8412) is coaxially connected with the first gear (8411), the second reel (8422) is coaxially connected with the second gear (8421), the first reel (8412) and the second reel (8422) have opposite rotating directions, the bottom plate (81) is provided with a first guide post (8451), a second guide post (8452), a third guide post (8455) and a fourth guide post (8456), the first slider (8453) and the second slider (8454) are both arranged on the bottom plate (81) in a sliding manner, the tension spring (844) is connected between the first slider (8453) and the second slider (8454), one end of the first pull rope (843) is connected with the first reel (8412), and the other end of the first pull rope (843) sequentially passes through the first guide post (8451) and the first slider (8453) and then is connected with the second reel (8452), one end of the second pull rope (8431) is connected with the second winding drum (8422), and the other end of the second pull rope (8431) sequentially bypasses the fourth guide post (8456) and a sixth guide post on the second sliding block (8454) and then is connected with the third guide post (8455).

5. The apparatus for detecting hardness of building material according to claim 4, wherein the first slider (8453) and the second slider (8454) are slidably fitted over a slide bar (846) provided on the base plate (81).

6. The building material hardness detection device according to claim 4, wherein the reset assembly (85) comprises a third rack (851), a fourth rack (852), a third gear (853) and an electric telescopic rod (854), the third rack (851) is connected with one floating piece (83), the fourth rack (852) is connected with the other floating piece (83), the third rack (851) and the fourth rack (852) are arranged in parallel and oppositely, the third gear (853) is rotatably arranged between the third rack (851) and the fourth rack (852), the third gear (853) is simultaneously meshed with the third rack (851) and the fourth rack (852), the electric telescopic rod (854) is arranged on the bottom plate (81), and the output end of the electric telescopic rod (854) extends outwards through the protective shell (88), an extension rod (855) connected to the fourth rack (852) penetrates through the protective shell (88) to extend outwards, and the extension rod (855) is detachably connected with the output end of the electric telescopic rod (854).

7. The building material hardness detection device according to claim 6, wherein a pin hole (8551) is formed in the extension rod (855), a connection block (856) is connected to an output end of the electric telescopic rod (854), a connection screw (857) is connected to the connection block (856) in a threaded manner, and a pin rod (8571) of the connection screw (857) can be inserted into the pin hole (8551).

8. The building material hardness detecting apparatus according to claim 7, wherein the overload protection mechanism (8) further includes a pair of buffer members (86), the pair of buffer members (86) being symmetrically connected below the upper deck portion (821), the buffer component (86) comprises a push plate (861), a compression spring (862), a telescopic cylinder (863) and a telescopic rod (864), the upper end of the telescopic cylinder (863) is connected with the upper platform part (821), the telescopic rod (864) is telescopically arranged in the telescopic cylinder (863), the lower end of the telescopic cylinder (863) is connected with the push plate (861), the compression spring (862) is sleeved on the outer sides of the telescopic cylinder (863) and the telescopic rod (864), and one end of the compression spring (862) is pressed against the lower surface of the upper platform part (821), the other end of the compression spring (862) is pressed against the push plate (861).

9. The construction material hardness detecting apparatus according to claim 1, wherein the elevating mechanism (9) includes a motor (91), a driving pulley (92), a transmission belt (93), a pair of driven pulleys (94), a pair of lead screws (95), and a pair of nuts (96), the motor (91) is arranged on the frame (1), the driving belt wheel (92) is connected with the motor (91), the driving belt (93) is sleeved on the driving belt wheel (92) and the pair of driven belt wheels (94), the pair of screw rods (95) are vertically and rotatably arranged on the rack (1), the pair of driven belt wheels (94) are respectively connected with the pair of screw rods (95), the pair of nuts (96) are respectively in threaded connection with the pair of screw rods (95), and the nuts (96) are fixedly connected with the lifting frame (7).