CN219653674U - Device for detecting degree of compaction of earth backfill - Google Patents

Abstract

The utility model discloses an earthwork backfill compactness detection device, which relates to the technical field of compactness detection and comprises a frame body, wherein a soil taking mechanism and a soil drilling mechanism are arranged on the frame body in a sliding manner, the sliding paths of the soil taking mechanism and the soil drilling mechanism are the same, and the soil taking mechanism and the soil drilling mechanism can be locked with the frame body at the same position; the soil sampling mechanism comprises a cutting ring and a driving assembly for driving the cutting ring to vertically lift; the earth boring mechanism comprises a drill bit capable of moving vertically and rotating and a driving source for driving the drill bit to rotate and lift. The utility model has the effect of facilitating soil taking by a sand filling method or a cutting ring method.

Description

Device for detecting degree of compaction of earth backfill

Technical Field

The utility model relates to the technical field of compactness detection, in particular to an earthwork backfill compactness detection device.

Background

Compaction, also known as compaction, refers to the ratio of the dry density of the compacted earth or other road construction material to the standard maximum dry density. The earth backfill compactness detection modes mainly include a ring cutter method, a sand filling method and a nuclear densitometer method.

Nuclear densitometry involves less effort in the actual construction process because it is more expensive and associated with radiation. The sand filling method needs to drill a hole with known diameter and depth on a construction site manually, take out filling soil in the hole, fill the drilled hole with clean and uniform fine sand, perform preliminary weighing measurement and dehumidification weighing measurement on the taken out filling soil, and then calculate the compactness according to the calculation principle of the compactness; the ring cutter method is to cut a soil sample by using a ring cutter with known mass and volume, and obtain the mass of the soil by subtracting the mass of the ring cutter after preliminary weighing, wherein the volume of the ring cutter is the volume of the soil, so that the density of the soil can be obtained; wherein, the operation of the ring cutting method is simple, and the application is very wide.

Whether the compaction degree detection is carried out by using a sand filling method or a ring cutter method, soil sampling is required, if the compaction degree detection is carried out by using the ring cutter method, a worker is required to vertically erect the ring cutter on a soil layer and vertically press the ring cutter downwards during soil sampling until the ring cutter is completely buried in the soil layer, but in the pressing process, the ring cutter is easy to incline, and the manual pressing of the ring cutter is laborious; if the compactness is detected by using a sand filling method, a vertical cylindrical pit needs to be dug vertically downwards in a drawn area by using a Luoyang shovel manually, but the pit is easy to dig askew and dig excessively in the process of digging, and the labor is wasted in the process of digging.

Disclosure of Invention

In order to solve the problems of time and labor waste of manual soil taking by a sand filling method or a cutting ring method, the utility model provides an earthwork backfill compactness detection device.

The utility model provides an earthwork backfill compactness detection device, which adopts the following technical scheme:

the earthwork backfill compactness detection device comprises a frame body, wherein an earth taking mechanism and an earth drilling mechanism are arranged on the frame body in a sliding manner, the sliding paths of the earth taking mechanism and the earth drilling mechanism are the same, and the earth taking mechanism and the earth drilling mechanism can be locked with the frame body at the same position;

the soil sampling mechanism comprises a cutting ring and a driving assembly for driving the cutting ring to vertically lift;

the earth boring mechanism comprises a drill bit capable of moving vertically and rotating and a driving source for driving the drill bit to rotate and lift.

By adopting the technical scheme, the frame body is erected in the soil region to be extracted, if compaction degree detection is carried out by using a cutter ring method, the cutter ring is driven to move downwards by using the driving component until the cutter ring is buried in the soil layer, and then the cutter ring is manually taken out from the soil layer; if the compactness is detected by the sand filling method, the soil taking mechanism is firstly utilized to embed the cutting ring into the soil layer, then the drill bit of the soil drilling mechanism is utilized to drill out the soil in the cutting ring, and the drilled soil is collected. The device ensures that the cutting ring is not easy to incline in the process of pressing the cutting ring to a soil layer when the soil is taken by using the cutting ring method, and can be vertically pressed down as much as possible; when the sand filling method is utilized to take soil, the step of manual soil shoveling is omitted, operators are more labor-saving through the soil drilling mechanism, and in the soil drilling process, due to the annular cutters on the periphery, more drilling, less drilling or askew drilling are not easy to occur in the soil drilling process, and test errors in the soil taking process are reduced.

Optionally, the support body includes frame plate and stabilizer blade, the stabilizer blade with the frame plate rotates to be connected, the stabilizer blade can fold to with the laminating of frame plate, just the stabilizer blade rotates to vertical back locking.

Through adopting above-mentioned technical scheme, after the process of taking out earth is accomplished, fold the stabilizer blade of support body for the support body is in the folded condition, and the operating personnel of being convenient for carries the support body.

Optionally, a slide way is provided on the frame plate, and the soil drilling mechanism and the soil sampling mechanism both slide in the slide way.

Through adopting above-mentioned technical scheme, offer the slide on the frame plate for soil drilling mechanism and soil sampling mechanism homoenergetic slide along the slide, after soil sampling mechanism pushes down the cutting ring to the soil layer, can slide soil sampling mechanism to other positions along the slide, and slide soil drilling mechanism to the cutting ring top, bore the soil in the cutting ring.

Optionally, the driving assembly comprises a first threaded rod penetrating through the slideway, an installation cover is fixed at one end head of the first threaded rod, and the ring cutter is detachably connected to the installation cover;

one end of the first threaded rod, which is far away from the installation cover, is fixed with an operation disc, the operation disc is positioned on one side of the frame plate, which is far away from the installation cover, and a limiting structure for limiting the soil taking mechanism to horizontally move is arranged on the frame plate.

By adopting the technical scheme, after the frame body is erected in the soil taking area by an operator, the ring cutter is mounted on the mounting cover, the soil taking mechanism is fixed relative to the horizontal position of the frame plate through the limiting structure, the operator enables the first threaded rod to move downwards through the operation panel, and accordingly the mounting cover fixedly connected with the first threaded rod and the ring cutter fixedly connected with the mounting cover are driven to move downwards, and the ring cutter can be pressed down into the soil layer; the limiting structure is arranged, so that the cutting ring is not easy to horizontally deviate and incline in the pressing process.

Optionally, the drive assembly further includes a first stopper, the first stopper slides for the frame plate, and first threaded rod passes first stopper and with first stopper threaded connection, still be provided with the locking component that is used for locking first stopper position on the frame plate.

Through adopting above-mentioned technical scheme, operating personnel utilize locking element to lock first stopper on the frame plate, and operating personnel rotates the operating panel this moment, and first threaded rod can rotate for first stopper to vertical movement, thereby drive the cutting ring and go up and down, set up first stopper, can provide stable support for first threaded rod and installation lid on the one hand, in addition under the spacing effect of first stopper, cutting ring vertical movement makes the cutting ring push down in-process difficult slope difficult off normal.

Optionally, a plurality of circles of concentric thread grooves are formed in the side wall, far away from the first threaded rod, of the mounting cover; the ring cutters are provided with a plurality of, each port of the ring cutters is provided with a thread section, and the plurality of ring cutters can be in one-to-one corresponding thread connection to one thread groove.

By adopting the technical scheme, because the volume of the cutting ring for soil taking by adopting the cutting ring method is different from that of the cutting ring for soil taking by adopting the sand filling method, a plurality of circles of thread grooves are formed in the mounting cover, and the detachable connection between the cutting ring and the mounting cover can be realized by rotating the thread section of the cutting ring into the thread grooves in the mounting cover.

Optionally, the driving source comprises an output shaft capable of rotating, a coaxial second threaded rod is detachably connected to the output end, the second threaded rod penetrates through the slideway, and the drill bit is detachably connected to one end, far away from the driving source, of the second threaded rod;

the second threaded rod is connected with a second limiting block in a threaded mode, the second limiting block can be locked through the locking assembly, a guide rod parallel to the second threaded rod is arranged on the second limiting block, and a guide hole for the guide rod to slide is formed in the driving source.

By adopting the technical scheme, when the compaction degree detection is carried out by using the sand filling method, after the soil sampling mechanism is used for burying the ring cutter into a soil layer, the soil drilling mechanism is slipped to the position right above the ring cutter, the second limiting block is fixed on the frame plate by the locking component, the driving source is started, the driving source drives the second threaded rod to rotate, on one hand, the second threaded rod moves downwards in the rotation process of the second threaded rod, meanwhile, the drill bit at the end of the second threaded rod is driven to rotate, the soil in the ring cutter is cut by the drill bit and the ring cutter is discharged, the step of manual soil digging by an operator is reduced, and when a test pit is dug downwards, the soil is dug downwards vertically, and deviation or inclination is not easy to happen;

a second limiting block is arranged to provide stable support for the driving source and the second threaded rod; meanwhile, a guide rod is arranged on the second limiting block, and a guide hole is formed in the driving source, so that the driving source can drive the second threaded rod to rotate.

Optionally, limit structure is including seting up the fixed slot on the frame plate, the fixed slot with the slide intercommunication, be fixed with first fixture block on the first stopper, be fixed with the second fixture block on the second stopper, first fixture block with the second fixture block homoenergetic joint to in the fixed slot.

By adopting the technical scheme, when the soil sampling mechanism is used for downwards pressing the ring cutter, the soil sampling mechanism slides along the slideway until the first clamping block is clamped in the fixed groove, and when the ring cutter is downwards pressed to a soil layer, the soil sampling mechanism is not easy to deviate; and in the same way, after the soil sampling mechanism is used for pressing down the cutting ring to the soil layer, the soil sampling mechanism is removed, and the soil drilling mechanism slides to the second clamping block along the slideway to be clamped in the fixed slot, so that the soil drilling mechanism is not easy to deviate or slide when the soil drilling mechanism is used for drilling soil.

Optionally, the locking assembly includes a locking plate fixed on the frame plate, and the locking plate is provided with a perforation;

a first bolt hole is formed in the first limiting block, and after the first clamping block is clamped to the fixing groove, the through hole in the locking plate is aligned with the first bolt hole;

and a second bolt hole is formed in the second limiting block, and after the second clamping block is clamped to the fixing groove, the through hole in the locking plate is aligned with the second bolt hole.

By adopting the technical scheme, when the soil sampling mechanism works, the pin shafts are inserted into the aligned perforation holes and the first pin holes, so that the first limiting block is fixed with the frame plate in the vertical direction, and the first threaded rod can smoothly move downwards in the process of rotating the operating panel;

similarly, when the drill bit mechanism operates, a pin shaft is inserted into the aligned perforation and the second pin hole, so that the second limiting block is fixed with the frame plate in the vertical direction, and when the driving source drives the second threaded rod to rotate, the second threaded rod can smoothly lift, thereby driving the drill bit to drill soil.

In summary, the present utility model includes at least one of the following beneficial effects:

1. the soil sampling mechanism is arranged, when the ring cutter is pressed down into the soil layer, the ring cutter can be pressed down into the soil layer only by rotating the operating panel, and operators are more labor-saving in the process, and the ring cutter is not easy to incline and deviate in the pressing process;

2. the device is provided with the cutting rings with various specifications, and the cutting rings with various specifications can be fixedly connected to the mounting cover, so that the device can be used for soil taking by a cutting ring method and soil taking by a sand filling method;

3. the soil drilling mechanism is arranged, so that the step of digging soil when an operator detects the compactness by using a sand filling method is omitted, the workload of the operator is reduced, and the possibility of test errors caused by manual errors in the manual soil digging process is reduced;

4. set up the fixed slot on the support body to set up first fixture block and second fixture block, make soil sampling mechanism and boring soil mechanism location more accurate, the drill bit also can be better when boring soil aim at the cutting ring top, and the operation is simpler convenient.

Drawings

FIG. 1 is a schematic view of the overall structure of an embodiment of the present utility model;

FIG. 2 is a schematic view of a soil sampling mechanism according to an embodiment of the present utility model;

FIG. 3 is a schematic view of the structure of the mounting cap and two cutting rings of an embodiment of the present utility model;

FIG. 4 is a schematic view of the structure of the earth-boring mechanism according to the embodiment of the present utility model;

fig. 5 is a schematic view showing a partial structure of a fixing groove according to an embodiment of the present utility model.

Reference numerals illustrate: 1. a frame body; 11. a frame plate; 111. a slideway; 112. a fixing groove; 12. a support leg; 2. a soil sampling mechanism; 21. cutting ring; 211. a threaded section; 22. a mounting cover; 221. a thread groove; 23. a first threaded rod; 24. an operation panel; 25. a first limiting block; 251. a first pin hole; 26. a first clamping block; 3. a soil drilling mechanism; 31. a drill bit; 32. a driving source; 321. a guide hole; 33. a second threaded rod; 34. a second limiting block; 341. a guide rod; 342. a second pin hole; 35. a second clamping block; 4. a locking plate; 41. and (5) perforating.

Detailed Description

The utility model is described in further detail below with reference to fig. 1-5.

Referring to fig. 1, the earth backfill compactness detection device disclosed by the embodiment of the utility model comprises a frame body 1, wherein the frame body 1 comprises a frame plate 11 and supporting legs 12, the frame plate 11 is a rectangular plate and has a thickness, the supporting legs 12 are four, the four supporting legs 12 are arranged at positions close to four corners of the frame plate 11, one ends of the supporting legs 12 are rotationally connected with the frame plate 11, after the supporting legs 12 are unfolded, the axes of the supporting legs 12 are at right angles with the plate surface of the frame plate 11 and can be locked by locking pieces such as bolts and bolts, and after the supporting legs 12 are folded, the supporting legs 12 can be attached to the plate surface of the frame plate 11.

Referring to fig. 1, a slide 111 is provided on the frame 11, and preferably, the slide 111 is provided in an L-shape, and the soil drilling mechanism 3 and the soil sampling mechanism 2 slide in the slide 111.

Referring to fig. 2 and 3, the soil sampling mechanism 2 includes a driving assembly and two cutters 21 having different diameters and heights, and the driving assembly is used for driving one cutter 21 to be pressed down into the soil layer to be sampled. Of the two ring cutters 21, one ring cutter 21 has smaller diameter and lower height for soil sampling by a ring cutter method; the other ring cutter 21 has a larger diameter and a higher height and is used for soil taking by a sand filling method.

Referring to fig. 1 and 2, the driving assembly includes a first stopper 25 and a first threaded rod 23 passing through the slide 111, the first stopper 25 slides on the top surface of the frame plate 11, the first stopper 25 cannot pass through the slide 111, a threaded hole is formed in the first stopper 25, and the first threaded rod 23 passes through the threaded hole and is in threaded connection with the first stopper 25. An operation panel 24 is fixed at the end of the upper end of the first threaded rod 23, and an operator holds the operation panel 24 by hand and rotates the operation panel 24 to drive the first threaded rod 23 to rotate.

Referring to fig. 2 and 3, an end of the first threaded rod 23 far away from the operation disc 24 is fixedly provided with a mounting cover 22, the mounting cover 22 is specifically a cylindrical metal disc, two circles of coaxial circular thread grooves 221 are formed in the side wall of the mounting disc far away from the first threaded rod 23, a thread section 211 is formed in the outer wall of one end of the ring cutter 21, and the two ring cutters 21 can be correspondingly connected into the two thread grooves 221 in a threaded manner so as to realize fixed connection between the ring cutters 21 and the mounting cover 22.

Referring to fig. 1 and 4, the earth boring mechanism 3 includes a driving source 32, the driving source 32 includes a rotatable output shaft, the driving source 32 is specifically a motor, a coaxial second threaded rod 33 is detachably connected to the output shaft of the driving source 32, a drill bit 31 is detachably connected to an end of the second threaded rod 33 away from the driving source 32, and specifically, a detachable connection is achieved between an end of the second threaded rod 33 away from the driving source 32 and the drill bit 31 through bolts. The drill 31 is a screw drill 31, and the drill diameter of the drill 31 is the same as or slightly smaller than the inner diameter of the larger one 21 of the two cutters 21. The second threaded rod 33 passes through the slide 111, the driving source 32 and the drill bit 31 are respectively arranged on two sides of the frame plate 11, the second threaded rod 33 is further in threaded connection with a second limiting block 34, a specific second limiting block 34 is provided with a threaded hole, and the second threaded rod 33 passes through the threaded hole so as to realize threaded connection of the second threaded rod 33 and the second limiting block 34. The second limiting block 34 is further connected with a plurality of guide rods 341 in a threaded manner, only one guide rod 341 is shown in the figure, the guide rods 341 are vertically arranged, a guide hole 321 is formed in the driving source 32, and the guide rods 341 penetrate through the guide hole 321.

Referring to fig. 1 and 5, the frame plate 11 is provided with a limiting structure for limiting the horizontal movement of the soil sampling mechanism 2 and the soil drilling mechanism 3, and the limiting structure is specifically two fixing grooves 112 formed in the frame plate 11, and the two fixing grooves 112 are located on two sides of the slide 111 and are communicated with the slide 111. Two first clamping blocks 26 are fixed on the first limiting block 25, two second clamping blocks 35 are fixed on the second limiting block 34, and the two first clamping blocks 26 or the second clamping blocks 35 can be clamped in the two fixing grooves 112. When the first clamping block 26 or the second clamping block 35 is clamped in the fixing groove 112, the soil sampling mechanism 2 or the soil drilling mechanism 3 is fixed at the horizontal position on the frame plate 11.

Referring to fig. 2 and 5, a locking assembly for locking the vertical position of the first stopper 25 or the second stopper 34 is further provided on the frame plate 11, the locking assembly includes locking plates 4 provided on opposite sides of the two fixing grooves 112, the locking plates 4 are fixedly provided on the frame plate 11, and each locking plate 4 is provided with a through hole 41. Simultaneously, two first bolt holes 251 are formed in the first limiting block 25, after the first clamping block 26 on the first limiting block 25 is clamped to the fixing groove 112 when the soil taking mechanism 2 slides to the first limiting block 25, the two first bolt holes 251 on the first limiting block 25 are aligned with the through holes 41 on the two locking plates 4 respectively, and after bolts are inserted into the first bolt holes 251 and the through holes 41 at the same time, the vertical position of the first limiting block 25 relative to the frame plate 11 is fixed.

Referring to fig. 4 and 5, two second bolt holes 342 are formed in the second limiting block 34, when the second clamping block 35 is clamped to the fixing groove 112, the two second bolt holes 342 on the second limiting block 34 are aligned with the through holes 41 on the two locking plates 4 respectively, and after bolts are inserted into the second bolt holes 342 and the through holes 41 at the same time, the vertical position of the second limiting block 34 relative to the frame plate 11 is fixed.

The embodiment of the utility model provides an implementation principle of an earthwork backfill compactness detection device, which comprises the following steps: when the earth backfill compaction degree is detected by the ring cutter method or the sand filling method, firstly, soil needs to be taken out from a detected area. When taking soil, the frame body 1 of the device is firstly placed on the ground firmly.

If the compactness is detected by the ring method, the ring 21 with a smaller diameter is first screwed onto the mounting cover 22, and the soil sampling mechanism 2 is slid until the first clamping block 26 is clamped into the fixing groove 112, and simultaneously the bolts are inserted into the first bolt holes 251 and the through holes 41, so that the position of the first limiting block 25 relative to the frame plate 11 is fixed. At this time, the operator rotates the operation panel 24, so that the operation panel 24 rotates in a direction of screwing the cutter ring 21 and the first limiting block 25, the cutter ring 21 is rotated and moves downwards by rotating the operation panel 24, the cutter ring 21 can be pressed into the soil layer by continuing to rotate the operation panel 24, and after the cutter ring 21 is pressed into the soil layer, the operation panel 24 is rotated reversely, so that the cutter ring 21 is separated from the mounting cover 22, and the cutter ring 21 is successfully pressed down into the soil layer at this time. The operator continues to manually excavate soil and takes out the cutting ring 21, so that the soil taking step of compactness detection can be completed.

If compaction is detected by the sand filling method, firstly, the ring cutter 21 with a larger diameter is connected to the mounting cover 22 by threads, the second threaded rod 33 passes through the slide way 111, the drill bit 31 and the driving source 32 are fixed at two ends of the second threaded rod 33, the soil sampling mechanism 2 is slipped until the second clamping block 35 is clamped into the fixed groove 112, and at this time, the operator presses the ring cutter 21 into the soil layer according to the steps of the ring cutter method. After the cutting ring 21 is pressed into the soil layer, the first clamping block 26 is separated from the fixing groove 112 by the sliding soil taking mechanism 2, the soil drilling mechanism 3 is slid to the second clamping block 35 to be clamped into the fixing groove 112, and meanwhile, bolts are inserted into the second bolt holes 342 and the through holes 41, so that the position of the second clamping block 35 relative to the frame plate 11 is fixed. At this time, the drill bit 31 is located right above the cutting ring 21, the driving source 32 is started, the driving source 32 drives the drill bit 31 to drill soil downwards, the drill bit 31 drills out soil layers in the cutting ring 21, and an operator rapidly collects the drilled soil into a plastic bag so as to reduce evaporation of water in the drilled soil. After the soil sampling is completed, an operator can perform the next test step, and the support legs 12 of the frame body 1 can be folded to facilitate the carrying of the frame body 1.

The above embodiments are not intended to limit the scope of the present utility model, so: all equivalent changes in structure, shape and principle of the utility model should be covered in the scope of protection of the utility model.

Claims (9)

1. The utility model provides an earthwork backfill compactness detection device which characterized in that: the soil sampling device comprises a frame body (1), wherein a soil sampling mechanism (2) and a soil drilling mechanism (3) are arranged on the frame body (1) in a sliding manner, the sliding paths of the soil sampling mechanism (2) and the soil drilling mechanism (3) are the same, and the soil sampling mechanism and the soil drilling mechanism can be locked with the frame body (1) at the same position;

the soil sampling mechanism (2) comprises a cutting ring (21) and a driving assembly for driving the cutting ring (21) to vertically lift;

the earth boring mechanism (3) comprises a drill bit (31) capable of moving vertically and rotating and a driving source (32) for driving the drill bit (31) to rotate and lift.

2. The earth backfill compactness detection device as claimed in claim 1, characterized in that: the frame body (1) comprises a frame plate (11) and supporting legs (12), the supporting legs (12) are rotationally connected with the frame plate (11), the supporting legs (12) can be folded to be attached to the frame plate (11), and the supporting legs (12) are rotated to be locked after being vertical.

3. The earth backfill compactness detection device as claimed in claim 2, characterized in that: the frame plate (11) is provided with a slide way (111), and the soil drilling mechanism (3) and the soil taking mechanism (2) slide in the slide way (111).

4. An earth backfill compaction degree detection device according to claim 3, wherein: the driving assembly comprises a first threaded rod (23) penetrating through the slideway (111), an installation cover (22) is fixed at one end head of the first threaded rod (23), and the cutting ring (21) is detachably connected to the installation cover (22);

one end of the first threaded rod (23) far away from the installation cover (22) is fixedly provided with an operation disc (24), the operation disc (24) is positioned on one side of the frame plate (11) far away from the installation cover (22), and the frame plate (11) is provided with a limiting structure for limiting the horizontal movement of the soil sampling mechanism (2).

5. The earth backfill compaction degree detection device according to claim 4, wherein: the driving assembly further comprises a first limiting block (25), the first limiting block (25) slides relative to the frame plate (11), a first threaded rod (23) penetrates through the first limiting block (25) and is in threaded connection with the first limiting block (25), and a locking assembly used for locking the position of the first limiting block (25) is further arranged on the frame plate (11).

6. The earth backfill compaction degree detection device according to claim 4, wherein: the side wall of the mounting cover (22) far away from the first threaded rod (23) is provided with a plurality of circles of concentric thread grooves (221); the number of the cutting rings (21) is multiple, the port of each cutting ring (21) is provided with a thread section (211), and the cutting rings (21) can be in threaded connection into one thread groove (221) in a one-to-one correspondence manner.

7. The earth backfill compaction degree detection device according to claim 5, wherein: the driving source (32) comprises an output shaft capable of rotating, a second coaxial threaded rod (33) is detachably connected to the output shaft, the second threaded rod (33) penetrates through the slide way (111), and the drill bit (31) is detachably connected to one end, far away from the driving source (32), of the second threaded rod (33);

the second threaded rod (33) is connected with a second limiting block (34) in a threaded mode, the second limiting block (34) can be locked through a locking assembly, a guide rod (341) parallel to the second threaded rod (33) is arranged on the second limiting block (34), and a guide hole (321) for the guide rod (341) to slide is formed in the driving source (32).

8. The earth backfill compactness detection device of claim 7, characterized in that: the limiting structure comprises a fixing groove (112) formed in the frame plate (11), the fixing groove (112) is communicated with the slide way (111), a first clamping block (26) is fixed on the first limiting block (25), a second clamping block (35) is fixed on the second limiting block (34), and the first clamping block (26) and the second clamping block (35) can be clamped into the fixing groove (112).

9. The earth backfill compactness detection device of claim 8, characterized in that: the locking assembly comprises a locking plate (4) fixed on the frame plate (11), and a through hole (41) is formed in the locking plate (4);

a first bolt hole (251) is formed in the first limiting block (25), and after the first clamping block (26) is clamped to the fixed groove (112), the through hole (41) in the locking plate (4) is aligned with the first bolt hole (251);

and a second bolt hole (342) is formed in the second limiting block (34), and after the second clamping block (35) is clamped to the fixing groove (112), the through hole (41) in the locking plate (4) is aligned with the second bolt hole (342).