CN213337458U - Nondestructive testing device for tree stress wave - Google Patents

Abstract

The utility model relates to the technical field of detection equipment, in particular to a tree stress wave nondestructive detection device, which can save labor by arranging the equipment, and can adjust the knocking force of a hammering block on wood to reduce the limitation; the automatic hammer comprises a working plate, two sets of supporting legs, two sets of brackets, two sets of stress wave sensors, a central control box, a first supporting plate, two sets of guide rods, a hammering block, a first movable plate, two sets of first springs, a second supporting plate, a first guide rail, a first screw rod, a first motor, a first screw sleeve, a cylinder, a push rod and rollers, the bottom end of the working plate is connected with the tops of the two sets of supporting legs, the two sets of brackets are installed on the top end of the working plate, the left side and the right side of the top end of the working plate are respectively provided with two sets of pressing devices, the rear side of the top end of the working plate is provided with a.

Description

Nondestructive testing device for tree stress wave

Technical Field

The utility model relates to a check out test set's technical field especially relates to a trees stress wave nondestructive test device.

Background

As is well known, the method commonly used for detecting the internal structure of the wood is to install stress wave sensors at two ends of the wood, then manually beat the stress wave sensor at one side by a small hammer to make the knocked stress wave sensor generate vibration, then the vibration is transmitted to the stress wave sensor at the other side by the wood, and the internal structure of the wood is detected according to the vibration amplitude of the two groups of stress wave sensors; however, the operation is found to consume a large amount of physical power, and has poor control strength and high limitation.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a can use manpower sparingly to can adjust the hammering piece to ligneous dynamics of striking, reduce the trees stress wave nondestructive test device of its limitation.

The tree stress wave nondestructive testing device of the utility model comprises a working plate, two groups of supporting legs, two groups of brackets, two groups of stress wave sensors, a central control box, a first supporting plate, two groups of guide rods, a hammering block, a first moving plate, two groups of first springs, a second supporting plate, a first guide rail, a first screw rod, a first motor, a first screw sleeve, a cylinder, a push rod and a roller, wherein the bottom end of the working plate is connected with the top ends of the two groups of supporting legs, the two groups of brackets are arranged at the top end of the working plate, the left side and the right side of the top end of the working plate are respectively provided with two groups of pressing devices, the two groups of stress wave sensors are respectively arranged at the top ends of the two groups of pressing devices, the central control box is arranged at the top end of the working plate, the first supporting plate is arranged at the left side of the top end of the working plate, the right ends of, the hammering block is arranged at the right ends of the two groups of guide rods, the first moving plate is arranged at the left ends of the two groups of guide rods, the two groups of first springs are respectively arranged at the left sides of the two groups of guide rods, the second supporting plate is arranged at the left end of the working plate, the first guide rail is arranged at the left side of the top end of the working plate, the right end of the first guide rail is connected with the first supporting plate, the left end of the first screw rod is rotatably arranged at the left end of the first supporting plate, the left end of the first screw rod penetrates through the second supporting plate and extends to the left side of the second supporting plate, the first screw rod is rotatably connected with the second supporting plate, the first motor is arranged at the left end of the second supporting plate, the first motor is connected with the left end of the first screw rod, the first screw sleeve is in threaded connection with the first screw rod, the first screw sleeve is slidably connected with the first guide rail, the air cylinder is, and a pressing device is arranged on the rear side of the top end of the working plate and corresponds to the two groups of brackets in position.

The tree stress wave nondestructive testing device of the utility model comprises a back plate, a top plate, a second screw sleeve, two groups of sliding sleeves, a second movable plate, a fixed seat, a second screw rod, a first bevel gear, a second motor, a rotating shaft, a second bevel gear, two groups of sliding rods and two groups of pressing blocks, wherein the back plate is arranged at the back side of the top end of a working plate, the top plate is arranged at the upper side of the front end of the back plate, the second screw sleeve is arranged at the middle part of the top plate, the two groups of sliding sleeves are respectively arranged at the left side and the right side of the top plate, the second movable plate is arranged below the top plate, the fixed seat is arranged at the top end of the second movable plate, the second screw rod and the second screw sleeve are screwed, the bottom end of the second screw rod can be rotatably arranged on the fixed seat, the first bevel gear is arranged at the lower side of the second screw rod, the second, the bottom ends of the two groups of sliding rods penetrate through the two groups of sliding sleeves to be installed at the top end of the second moving plate, the two groups of sliding rods are respectively in slidable connection with the two groups of sliding sleeves, the two groups of pressing blocks are respectively installed on the left side and the right side of the bottom end of the second moving plate, and the positions of the two groups of pressing blocks correspond to the positions of the two groups of brackets.

The utility model discloses a trees stress wave nondestructive test device, closing device compress tightly the storehouse including compressing tightly storehouse, second spring, sliding block and slide bar, and install on the working plate top, and second spring mounting compresses tightly the storehouse in, and second spring top is connected with the sliding block bottom, and the sliding block is located and compresses tightly the storehouse, and the slide bar bottom is passed and is compressed tightly the storehouse top and be connected with the sliding block to but the slide bar with compress tightly storehouse sliding connection, stress wave sensor installs on the slide bar top.

The utility model discloses a trees stress wave nondestructive test device still includes second guide rail and slider, and the second guide rail is installed at first backup pad right-hand member, and the slider is installed in hammering piece bottom to but slider and second guide rail sliding connection.

The utility model discloses a trees stress wave nondestructive test device still includes limiting plate and block rubber, and the limiting plate is installed at the slider right-hand member, and the block rubber is installed at the limiting plate left end.

The utility model discloses a trees stress wave nondestructive test device still includes the guard shield, and the guard shield is installed on second movable plate top, includes second motor and pivot in the guard shield.

The utility model discloses a trees stress wave nondestructive test device still includes contact switch, and contact switch installs on the guard shield top.

The utility model discloses a trees stress wave nondestructive test device still includes connecting plate, supporting seat and two sets of support covers, and the supporting seat is installed on the connecting plate, supporting seat and second screw rod top rotatable coupling, and two sets of support covers are installed respectively at connecting plate left end and right-hand member to two sets of support covers suit respectively at two sets of slide bar upsides.

Compared with the prior art, the beneficial effects of the utility model are that: placing wood on two groups of brackets, enabling two groups of stress wave sensors to be in contact with the bottom end of the wood, then opening a pressing device to enable the pressing device to fix and press the wood downwards, enabling the wood to drive the two groups of stress wave sensors to move downwards, enabling two groups of pressing devices to press the two groups of stress wave sensors so as to enable the two groups of stress wave sensors to extrude and tightly contact the bottom end of the wood, then opening an air cylinder to enable a push rod to drive a roller to move upwards, closing the air cylinder after the roller is higher than the bottom of a first moving plate, then opening a first motor to enable a first screw rod and a first screw sleeve to be screwed, enabling the first screw sleeve to slide on a first guide rail, enabling the first screw sleeve to drive the air cylinder to move leftwards integrally, enabling the roller to be in contact with the first moving plate and push the first moving plate to move leftwards, enabling two groups of guide rods to slide on a first supporting plate, and enabling two groups, when first swivel nut moved the operating position, close first motor, then open the cylinder, make the push rod drive the gyro wheel downstream to being less than first movable plate, then two sets of first springs then drive first movable plate right, two sets of guide bars then slide on first backup pad, two sets of first springs then shorten, two sets of guide bars then drive the hammering piece and move right, the hammering piece is then strikeed ligneous one end, timber is then vibrations, two sets of stress wave sensor then record and transmit the well accuse incasement to ligneous vibrations, thereby detect out the inside structure of timber, through setting up this equipment, can use manpower sparingly, and can adjust the hammering piece to ligneous dynamics of strikeing, reduce its limitation.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is an enlarged schematic view of the first motor of FIG. 1;

FIG. 3 is an enlarged schematic view of the second motor of FIG. 1;

FIG. 4 is an enlarged schematic view of the compaction chamber of FIG. 1;

in the drawings, the reference numbers: 1. a working plate; 2. a support leg; 3. a bracket; 4. a stress wave sensor; 5. A central control box; 6. a first support plate; 7. a guide bar; 8. hammering the block; 9. a first moving plate; 10. a first spring; 11. a second support plate; 12. a first guide rail; 13. a first screw; 14. A first motor; 15. a first threaded sleeve; 16. a cylinder; 17. a push rod; 18. a roller; 19. a back plate; 20. a top plate; 21. a second thread insert; 22. a sliding sleeve; 23. a second moving plate; 24. a fixed seat; 25. a second screw; 26. a first bevel gear; 27. a second motor; 28. a rotating shaft; 29. A second bevel gear; 30. a slide bar; 31. briquetting; 32. a compaction bin; 33. a second spring; 34. A slider; 35. a slide bar; 36. a second guide rail; 37. a slider; 38. a limiting plate; 39. A rubber block; 40. a shield; 41. a contact switch; 42. a connecting plate; 43. a supporting seat; 44. And a support sleeve.

Detailed Description

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

As shown in figures 1 to 4, the tree stress wave nondestructive testing device of the utility model comprises a working plate 1, two groups of supporting legs 2, two groups of brackets 3, two groups of stress wave sensors 4, a central control box 5, a first supporting plate 6, two groups of guide rods 7, a hammering block 8, a first moving plate 9, two groups of first springs 10, a second supporting plate 11, a first guide rail 12, a first screw 13, a first motor 14, a first screw sleeve 15, a cylinder 16, a push rod 17 and rollers 18, wherein the bottom end of the working plate 1 is connected with the top ends of the two groups of supporting legs 2, the two groups of brackets 3 are arranged at the top end of the working plate 1, the left side and the right side of the top end of the working plate 1 are respectively provided with two groups of pressing devices, the two groups of stress wave sensors 4 are respectively arranged at the top ends of the two groups of pressing devices, the central control box 5 is arranged at the top end of the working plate 1, the, the right ends of two groups of guide rods 7 penetrate through a first supporting plate 6 to extend to the right side of the first supporting plate 6, the two groups of guide rods 7 are slidably connected with the first supporting plate 6, a hammering block 8 is arranged at the right ends of the two groups of guide rods 7, a first moving plate 9 is arranged at the left ends of the two groups of guide rods 7, two groups of first springs 10 are respectively arranged at the left sides of the two groups of guide rods 7, a second supporting plate 11 is arranged at the left end of a working plate 1, a first guide rail 12 is arranged at the left side of the top end of the working plate 1, the right end of the first guide rail 12 is connected with the first supporting plate 6, the left end of the first guide rail 12 is connected with the second supporting plate 11, the right end of a first screw 13 is rotatably arranged at the left end of the first supporting plate 6, the left end of the first screw 13 penetrates through the second supporting plate 11 to extend to the left side of the second supporting plate 11, the first screw, the first threaded sleeve 15 is connected with the first screw rod 13 in a threaded manner, meanwhile, the first threaded sleeve 15 is connected with the first guide rail 12 in a sliding manner, the air cylinder 16 is installed at the top end of the first threaded sleeve 15, the bottom end of the push rod 17 is connected with the output end of the air cylinder 16, the roller 18 is rotatably installed at the top end of the push rod 17, the rear side of the top end of the working plate 1 is provided with a pressing device, and the pressing device corresponds to the two groups of brackets 3 in position; placing wood on two groups of brackets 3, enabling two groups of stress wave sensors 4 to be in contact with the bottom ends of the wood, then opening a pressing device to enable the pressing device to fix and press the wood downwards, enabling the wood to drive the two groups of stress wave sensors 4 to move downwards, enabling two groups of pressing devices to press the two groups of stress wave sensors 4, enabling the two groups of stress wave sensors 4 to extrude and tightly contact the bottom ends of the wood, then opening an air cylinder 16, enabling a push rod 17 to drive an idler wheel 18 to move upwards, closing the air cylinder 16 after the idler wheel 18 is higher than the bottom of a first moving plate 9, then opening a first motor 14, enabling a first screw 13 to be in threaded connection with a first threaded sleeve 15, enabling the first threaded sleeve 15 to slide on a first guide rail 12, simultaneously enabling the first threaded sleeve 15 to drive the air cylinder 16 to move leftwards integrally, then enabling the idler wheel 18 to be in contact with the first moving plate 9 and push the first moving plate 9 to move leftwards, enabling two groups of guide rods, elastic deformation then takes place for two sets of first springs 10, when first swivel nut 15 moved the operating position, close first motor 14, then open cylinder 16, make push rod 17 drive gyro wheel 18 downstream to be less than first movable plate 9, then two sets of first springs 10 then drive first movable plate 9 right, two sets of guide bars 7 then slide on first backup pad 6, two sets of first springs 10 then shorten, two sets of guide bars 7 then drive hammering piece 8 and move right, hammering piece 8 then strikes the one end of timber, timber then shakes, two sets of stress wave sensor 4 then record and transmit to well accuse incasement 5 to timber vibrations, thereby detect out the inside structure of timber, through setting up this equipment, can use manpower sparingly, and can adjust hammering piece 8 to the dynamics of knocking of timber, reduce its limitation.

The tree stress wave nondestructive testing device of the utility model comprises a rear plate 19, a top plate 20, a second thread sleeve 21, two sets of sliding sleeves 22, a second moving plate 23, a fixed seat 24, a second screw 25, a first bevel gear 26, a second motor 27, a rotating shaft 28, a second bevel gear 29, two sets of sliding rods 30 and two sets of pressing blocks 31, wherein the rear plate 19 is arranged at the rear side of the top end of a working plate 1, the top plate 20 is arranged at the upper side of the front end of the rear plate 19, the second thread sleeve 21 is arranged in the middle of the top plate 20, the two sets of sliding sleeves 22 are respectively arranged at the left side and the right side of the top plate 20, the second moving plate 23 is positioned below the top plate 20, the fixed seat 24 is arranged at the top end of the second moving plate 23, the second screw 25 and the second thread sleeve 21 are in a screw mode, the bottom end of the second screw 25 is rotatably arranged on the fixed seat, the left end of a rotating shaft 28 is connected with the output end of a second motor 27, a second bevel gear 29 is installed at the right end of the rotating shaft 28, the second bevel gear 29 is meshed with a first bevel gear 26, the bottom ends of two groups of sliding rods 30 penetrate through two groups of sliding sleeves 22 and are installed at the top end of a second moving plate 23, the two groups of sliding rods 30 are respectively connected with the two groups of sliding sleeves 22 in a sliding mode, two groups of pressing blocks 31 are respectively installed on the left side of the bottom end and the right side of the bottom end of the second moving plate 23; when the second motor 27 is turned on, the rotating shaft 28 drives the second bevel gear 29 to rotate, the second bevel gear 29 is meshed with the first bevel gear 26, the first bevel gear 26 drives the second screw 25 to rotate, the second screw 25 is screwed with the second screw sleeve 21, the second screw 25 drives the second moving plate 23 to integrally move downwards through the fixed seat 24, the two sets of sliding rods 30 slide on the two sets of sliding sleeves 22, and when the two sets of pressing blocks 31 are in contact with and fix the wood, the second motor 27 is turned off, so that the wood can be fixed, and meanwhile, the two sets of stress wave sensors 4 are also in close contact with the bottom of the wood.

The utility model discloses a trees stress wave nondestructive test device, closing device are including compressing tightly storehouse 32, second spring 33, sliding block 34 and slide bar 35, compress tightly storehouse 32 and install on 1 top of working plate, second spring 33 is installed in compressing tightly storehouse 32, second spring 33 top is connected with sliding block 34 bottom, sliding block 34 is located and compresses tightly storehouse 32, slide bar 35 bottom is passed and is compressed tightly the storehouse 32 top and be connected with sliding block 34, and slide bar 35 and compress tightly storehouse 32 slidable connection, stress wave sensor 4 is installed on slide bar 35 top; timber drives stress wave sensor 4 downstream, and slide bar 35 then drives sliding block 34 downstream, and sliding block 34 then extrudes second spring 33 to make second spring 33 take place elastic deformation, then second spring 33 then promotes sliding block 34 and slide bar 35 upward movement, thereby makes stress wave sensor 4 extrude timber and makes it and timber bottom in close contact with, improves the accuracy that detects.

The tree stress wave nondestructive testing device of the utility model also comprises a second guide rail 36 and a slide block 37, wherein the second guide rail 36 is arranged at the right end of the first supporting plate 6, the slide block 37 is arranged at the bottom end of the hammering block 8, and the slide block 37 is connected with the second guide rail 36 in a sliding way; by providing the second guide rail 36 and the slider 37, the slider 37 slides on the second guide rail 36 when the hammer block 8 moves, thereby functioning to support the hammer block 8.

The tree stress wave nondestructive testing device of the utility model also comprises a limiting plate 38 and a rubber block 39, wherein the limiting plate 38 is arranged at the right end of the slide block 37, and the rubber block 39 is arranged at the left end of the limiting plate 38; through setting up limiting plate 38 and rubber block 39, can play the situation that prevents slider 37 and second guide rail 36 separation from sliding on second guide rail 36, can play the effect to slider 37 buffering simultaneously.

The tree stress wave nondestructive testing device of the utility model also comprises a protective cover 40, the protective cover 40 is arranged at the top end of the second moving plate 23, and the protective cover 40 comprises a second motor 27 and a rotating shaft 28; by providing the protective cover 40, the second motor 27 can be protected, thereby improving the service life of the second motor 27.

The tree stress wave nondestructive testing device of the utility model also comprises a contact switch 41, the contact switch 41 is arranged on the top end of the protective cover 40; by providing the contact switch 41, when the contact switch 41 is in contact with the top plate 20, the contact switch 41 turns off the second motor 27, and collision between the apparatuses is avoided.

The tree stress wave nondestructive testing device of the utility model also comprises a connecting plate 42, a supporting seat 43 and two groups of supporting sleeves 44, wherein the supporting seat 43 is arranged on the connecting plate 42, the supporting seat 43 is rotatably connected with the top end of the second screw 25, the two groups of supporting sleeves 44 are respectively arranged at the left end and the right end of the connecting plate 42, and the two groups of supporting sleeves 44 are respectively sleeved at the upper sides of the two groups of sliding rods 30; the connecting plate 42, the supporting seat 43 and the supporting sleeve 44 are arranged to support the second screw 25 and the upper sides of the two sets of sliding rods 30, so as to improve the stability thereof.

The tree stress wave nondestructive testing device of the utility model, when in operation, firstly, wood is placed on two groups of brackets 3, two groups of stress wave sensors 4 are contacted with the bottom end of the wood, then the second motor 27 is opened, the rotating shaft 28 drives the second bevel gear 29 to rotate, the second bevel gear 29 is meshed with the first bevel gear 26, the first bevel gear 26 drives the second screw 25 to rotate, the second screw 25 is screwed with the second thread sleeve 21, the second screw 25 drives the second movable plate 23 to move downwards through the fixed seat 24, two groups of sliding rods 30 slide on two groups of sliding sleeves 22, when two groups of pressing blocks 31 are contacted with the wood, the wood continuously moves downwards, the wood drives two groups of stress wave sensors 4 to move downwards, two groups of sliding rods 35 drive two groups of sliding blocks 34 to move downwards, two groups of sliding blocks 34 extrude two groups of second springs 33, thereby causing two groups of second springs 33 to generate elastic deformation, then two sets of second springs 33 push two sets of sliding blocks 34 and two sets of sliding rods 35 to move upwards, so that two sets of stress wave sensors 4 extrude the wood to be in close contact with the bottom of the wood, after two sets of pressing blocks 31 fix the wood, the second motor 27 is turned off, then the cylinder 16 is turned on, the push rod 17 drives the roller 18 to move upwards, when the roller 18 is higher than the bottom of the first moving plate 9, the cylinder 16 is turned off, then the first motor 14 is turned on, the first screw 13 and the first screw 15 are screwed, the first screw 15 slides on the first guide rail 12, meanwhile, the first screw 15 drives the cylinder 16 to move leftwards integrally, then the roller 18 contacts with the first moving plate 9 and pushes the first moving plate 9 to move leftwards, two sets of guide rods 7 slide on the first support plate 6, two sets of guide rods 7 drive the hammering block 8 to move leftwards, the sliding block 37 slides on the second guide rail 36, two sets of first springs 10 then take place elastic deformation, when first swivel nut 15 moved the operating position, close first motor 14, then open cylinder 16, make push rod 17 drive gyro wheel 18 downstream to be less than first movable plate 9, then two sets of first springs 10 then drive first movable plate 9 right, two sets of guide bars 7 then slide on first backup pad 6, two sets of first springs 10 then shorten, two sets of guide bars 7 then drive hammering piece 8 and move right, slider 37 then slides on second guide rail 36, hammering piece 8 then strikes the one end of timber, timber then shakes, two sets of stress wave sensor 4 then record and transmit the centre control case 5 in to timber's vibrations, thereby it can to detect out the inside structure of timber.

The tree stress wave nondestructive testing device of the utility model has the advantages that the installation mode, the connection mode or the setting mode are common mechanical modes, and the device can be implemented as long as the beneficial effects can be achieved; the utility model discloses a trees stress wave nondestructive test device's stress wave sensor 4, well accuse case 5, first motor 14, cylinder 16, second motor 27 and contact switch 41 are purchase on the market, and this industry technical staff only need according to its subsidiary operating specification install and operate can.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims (8)

1. A nondestructive testing device for tree stress waves is characterized by comprising a working plate (1), two groups of supporting legs (2), two groups of brackets (3), two groups of stress wave sensors (4), a central control box (5), a first supporting plate (6), two groups of guide rods (7), a hammering block (8), a first moving plate (9), two groups of first springs (10), a second supporting plate (11), a first guide rail (12), a first screw (13), a first motor (14), a first screw sleeve (15), a cylinder (16), a push rod (17) and rollers (18), wherein the bottom end of the working plate (1) is connected with the top ends of the two groups of supporting legs (2), the two groups of brackets (3) are arranged at the top end of the working plate (1), the left side and the right side of the top end of the working plate (1) are respectively provided with two groups of pressing devices, the two groups of stress wave sensors (4) are respectively arranged at the top ends of, the central control box (5) is arranged on the top end of the working plate (1), the central control box (5) is electrically connected with two groups of stress wave sensors (4), the first supporting plate (6) is arranged on the left side of the top end of the working plate (1), the right ends of the two groups of guide rods (7) penetrate through the first supporting plate (6) to extend to the right side of the first supporting plate (6), the two groups of guide rods (7) are slidably connected with the first supporting plate (6), the hammering block (8) is arranged on the right ends of the two groups of guide rods (7), the first movable plate (9) is arranged on the left ends of the two groups of guide rods (7), the two groups of first springs (10) are respectively arranged on the left sides of the two groups of guide rods (7), the second supporting plate (11) is arranged on the left end of the working plate (1), the first guide rail (12) is arranged on the left side of the top end of the working plate (1), the right, the left end of the first guide rail (12) is connected with the second support plate (11), the right end of the first screw rod (13) can be rotatably installed at the left end of the first support plate (6), the left end of the first screw rod (13) passes through the second support plate (11) and extends to the left side of the second support plate (11), the first screw rod (13) is rotatably connected with the second support plate (11), the first motor (14) is installed at the left end of the second support plate (11), the first motor (14) is connected with the left end of the first screw rod (13), the first screw sleeve (15) is connected with the first screw rod (13) in a screw way, the first screw sleeve (15) is slidably connected with the first guide rail (12), the cylinder (16) is installed at the top end of the first screw sleeve (15), the bottom end of the push rod (17) is rotatably connected with the output end of the cylinder (16), the roller (18) is installed at the top end of the push rod (17), the rear side of the top end of the working plate (1) is provided with a pressing device, and the pressing device corresponds to the two groups of brackets (3).

2. The tree stress wave nondestructive testing device of claim 1, characterized in that the pressing device comprises a back plate (19), a top plate (20), a second screw sleeve (21), two sets of sliding sleeves (22), a second moving plate (23), a fixed seat (24), a second screw (25), a first bevel gear (26), a second motor (27), a rotating shaft (28), a second bevel gear (29), two sets of sliding rods (30) and two sets of pressing blocks (31), the back plate (19) is installed at the back side of the top end of the working plate (1), the top plate (20) is installed at the upper side of the front end of the back plate (19), the second screw sleeve (21) is installed at the middle part of the top plate (20), the two sets of sliding sleeves (22) are respectively installed at the left side and the right side of the top plate (20), the second moving plate (23) is located below the top plate (20), the fixed seat (24) is installed at the top end of the second, the second screw rod (25) is in threaded installation with the second threaded sleeve (21), the bottom end of the second screw rod (25) is rotatably installed on the fixed seat (24), the first bevel gear (26) is arranged at the lower side of the second screw rod (25), the second motor (27) is arranged at the top end of the second moving plate (23), the left end of the rotating shaft (28) is connected with the output end of a second motor (27), the second bevel gear (29) is arranged at the right end of the rotating shaft (28), the second bevel gear (29) is meshed with the first bevel gear (26), the bottom ends of the two groups of sliding rods (30) penetrate through the two groups of sliding sleeves (22) and are mounted at the top end of the second moving plate (23), the two groups of sliding rods (30) are respectively in slidable connection with the two groups of sliding sleeves (22), the two groups of pressing blocks (31) are respectively mounted on the left side and the right side of the bottom end of the second moving plate (23), and the positions of the two groups of pressing blocks (31) correspond to the positions of the two groups of brackets (3).

3. The nondestructive testing device for tree stress waves as defined in claim 1, wherein the compressing device comprises a compressing chamber (32), a second spring (33), a sliding block (34) and a sliding rod (35), the compressing chamber (32) is installed at the top end of the working plate (1), the second spring (33) is installed in the compressing chamber (32), the top end of the second spring (33) is connected with the bottom end of the sliding block (34), the sliding block (34) is located in the compressing chamber (32), the bottom end of the sliding rod (35) passes through the top end of the compressing chamber (32) to be connected with the sliding block (34), the sliding rod (35) is slidably connected with the compressing chamber (32), and the stress wave sensor (4) is installed at the top end of the sliding rod (35).

4. A tree stress wave nondestructive testing device according to claim 1, further comprising a second guide rail (36) and a slide block (37), wherein the second guide rail (36) is installed at the right end of the first supporting plate (6), the slide block (37) is installed at the bottom end of the hammering block (8), and the slide block (37) is slidably connected with the second guide rail (36).

5. The tree stress wave nondestructive testing device of claim 4, further comprising a limiting plate (38) and a rubber block (39), wherein the limiting plate (38) is installed at the right end of the sliding block (37), and the rubber block (39) is installed at the left end of the limiting plate (38).

6. A tree stress wave nondestructive testing apparatus as set forth in claim 2 further comprising a shield (40), said shield (40) mounted on top of said second movable plate (23), said shield (40) including a second motor (27) and a shaft (28) therein.

7. A tree stress wave nondestructive testing apparatus as recited in claim 6 further comprising a contact switch (41), said contact switch (41) mounted on the top end of said shroud (40).

8. The nondestructive testing device for stress waves of trees as claimed in claim 2, further comprising a connecting plate (42), a supporting seat (43) and two sets of supporting sleeves (44), wherein the supporting seat (43) is installed on the connecting plate (42), the supporting seat (43) is rotatably connected with the top end of the second screw (25), the two sets of supporting sleeves (44) are respectively installed at the left end and the right end of the connecting plate (42), and the two sets of supporting sleeves (44) are respectively sleeved on the upper sides of the two sets of sliding rods (30).

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