阅读说明：本技术 一种用于建筑施工的水平度检测装置 (Levelness detection device for building construction ) 是由 栗鹏 秦刚 孙东 赵惠 付磊 张珍华 卫岳 刘刚 张继方 田洪涛 于 2021-08-13 设计创作，主要内容包括：本发明涉及水平度检测领域,具体涉及一种用于建筑施工的水平度检测装置。摆杆上端可转动地安装在稳固支座的上端。第一弹簧上设置有重力块；第二弹簧沿摆杆的长度方向可伸缩地设置在摆杆上。摩擦块连接于第二弹簧的下端。旋转压块绕前后延伸的参考轴线,可转动地安装在摆杆上,旋转压块均固定连接第一弹簧的下端,旋转压块配置成相对于摩擦块转动以夹紧摩擦块或松开摩擦块,进而阻碍和允许摩擦块移动。阻挡板的上端可转动地安装于摆杆上,阻挡板与振动机构的上端均通过联动机构传动连接,以在阻挡板相对于摆杆发生相对转动时通过联动机构带动第一弹簧和第二弹簧的上端同步向上或向下移动,已达到提高水平角度检测的误差。(The invention relates to the field of levelness detection, in particular to a levelness detection device for building construction. The upper end of the swing rod is rotatably arranged at the upper end of the stable support. A gravity block is arranged on the first spring; the second spring is telescopically arranged on the swing rod along the length direction of the swing rod. The friction block is connected to the lower end of the second spring. The rotary pressing blocks are rotatably arranged on the swing rods around reference axes extending from front to back, the rotary pressing blocks are fixedly connected with the lower ends of the first springs, and the rotary pressing blocks are configured to rotate relative to the friction blocks to clamp or loosen the friction blocks so as to block and allow the friction blocks to move. The upper end of the blocking plate is rotatably arranged on the swing rod, the blocking plate is in transmission connection with the upper end of the vibrating mechanism through the linkage mechanism, so that the upper ends of the first spring and the second spring are driven by the linkage mechanism to synchronously move upwards or downwards when the blocking plate rotates relative to the swing rod, and the error of horizontal angle detection is improved.)

1. The utility model provides a levelness detection device for construction, includes firm support, its characterized in that: further comprising:

the swing rod is of a long rod structure, and the upper end of the swing rod is rotatably arranged at the upper end of the stable support;

the vibration mechanism comprises a first spring, a rotary pressing block, a second spring and a friction block; the first spring extends along the length direction of the oscillating bar and is arranged on the oscillating bar, and a gravity block is arranged on the first spring; the second spring is telescopically arranged on the oscillating bar along the length direction of the oscillating bar; the friction block is slidably arranged on the swing rod along the length direction of the swing rod and connected to the lower end of the second spring; the rotary pressing blocks are rotatably arranged on the swing rod around a reference axis extending from front to back, the rotary pressing blocks are fixedly connected with the lower end of the first spring, and the rotary pressing blocks are configured to rotate relative to the friction blocks so as to clamp or loosen the friction blocks and further block and allow the friction blocks to move;

the upper end of the blocking plate is rotatably arranged on the swing rod, and the blocking plate is in transmission connection with the upper end of the vibrating mechanism through a linkage mechanism so as to drive the upper ends of the first spring and the second spring to synchronously move upwards or downwards through the linkage mechanism when the blocking plate rotates relative to the swing rod.

2. The levelness detecting device for building construction according to claim 1, wherein:

the linkage mechanism comprises a toothed belt, a first fixed gear, a second fixed gear and a toothed belt pressing block;

the first fixed gear is rotatably arranged on the front side surface of the oscillating bar and is positioned above the vibrating mechanism; the second fixed gear can rotate below the first fixed gear and is positioned below the vibration mechanism; the toothed belt is arranged on the first fixed gear and the second fixed gear and is meshed with the first fixed gear and the second fixed gear; the toothed belt pressing block is horizontally arranged, one end of the toothed belt pressing block is fixedly connected with the inner side of the toothed belt, the lower side of the toothed belt pressing block is fixedly connected with the upper ends of the first spring and the second spring respectively, so that when the toothed belt pressing block slides up and down, the first spring and the second spring are driven to compress or extend, and the upper end of the blocking plate is fixedly connected with the first fixed gear.

3. The levelness detecting device for building construction according to claim 2, wherein:

the number of the first springs and the number of the rotary pressing blocks are two; two first spring grooves, a second spring groove and a rotary pressing block groove are formed in the front side face of the swing rod along the length direction of the swing rod; two first spring grooves are uniformly distributed on the swing rod, and each first spring groove is arranged on the swing rod

The first springs are all arranged in a first spring groove; the second spring groove is positioned between the two first spring grooves, each rotary pressing block groove is positioned at the lower end of the first spring groove and communicated with the first spring groove and the second spring groove, a rotary shaft extends out of the rotary pressing block in the front-back direction, and the rotary pressing block is rotatably installed and inserted on the rotary shaft;

the second spring is arranged in the second spring groove, and the lower end of the second spring groove is positioned below the lower end of the first spring groove, so that the friction block can enter the lower end of the second spring groove when getting rid of the obstruction of the rotating pressing block.

4. A levelness detecting device for building construction according to claim 3, wherein:

the first spring comprises a first upper spring and a first lower spring; the upper end of the gravity block is fixedly connected with the lower end of the first upper spring, and the lower end of the gravity block is fixedly connected with the upper end of the first lower spring.

5. A levelness detecting device for building construction according to claim 3, wherein:

the rotary pressing block groove is provided with a rotary shaft extending in the front-rear direction.

The rotary pressing block is in a long rod shape, can be rotatably arranged on the rotary shaft and is obliquely arranged in an initial state; the rotary pressing block is provided with a connecting block at the upper end, and the connecting block is fixedly connected to the rotary pressing block and the first spring.

6. The levelness detecting device for building construction according to claim 1, wherein:

a plurality of first connecting blocks and second connecting blocks are arranged on the lower side of the toothed belt pressing block; the first connecting block is slidably arranged in the first spring groove, the upper side of the first connecting block is fixedly connected with the lower side of the toothed belt pressing block, and the lower side of the first connecting block is fixedly connected with the upper side of the first spring; the second connecting block is slidably arranged in a second spring groove, the upper side of the second connecting block is fixedly connected with the lower side of the toothed belt pressing block, and the lower side of the second connecting block is fixedly connected with the upper side of the second spring.

7. The levelness detecting device for building construction according to claim 1, wherein:

the stable support comprises a vertical rod, a mounting plate and a plurality of toothed bars; the mounting plate is in a rectangular plate shape and is horizontally arranged; the vertical rod is vertically arranged on the mounting plate, and the upper end of the swing rod is rotatably arranged at the upper end of the vertical rod; the gear rod is vertically arranged, the upper end of the gear rod is fixedly connected with the mounting plate, and the lower end of the gear rod extends downwards to form a conical structure.

Technical Field

The invention relates to the field of levelness detection, in particular to a levelness detection device for building construction.

Background

The traditional levelness detection tool usually adopts the mode that the swing rod is hung at the upper end of the tool, whether a plane is horizontal or not is judged by judging the position relation between the swing rod and a datum line, and an included angle between the datum line and the swing rod is measured to obtain a horizontal angle value.

Disclosure of Invention

The invention provides a levelness detection device for building construction, which aims to solve the problem that an existing levelness detection device has errors in measurement.

The levelness detection device for building construction adopts the following technical scheme:

a levelness detection device for building construction comprises a stable support, a swing rod, a vibration mechanism and a barrier plate; the swing rod is of a long rod structure, and the upper end of the swing rod is rotatably arranged at the upper end of the stable support; the vibration mechanism comprises a first spring, a rotary pressing block, a second spring and a friction block; the first spring extends along the length direction of the oscillating bar and is arranged on the oscillating bar, and a gravity block is arranged on the first spring; the second spring is telescopically arranged on the oscillating bar along the length direction of the oscillating bar; the friction block is slidably arranged on the swing rod along the length direction of the swing rod and connected to the lower end of the second spring; the rotary pressing blocks are rotatably arranged on the swing rod around a reference axis extending from front to back, the rotary pressing blocks are fixedly connected with the lower end of the first spring, and the rotary pressing blocks are configured to rotate relative to the friction blocks so as to clamp or loosen the friction blocks and further block and allow the friction blocks to move; the upper end of the blocking plate is rotatably arranged on the swing rod, and the blocking plate is in transmission connection with the upper end of the vibrating mechanism through the linkage mechanism so as to drive the upper ends of the first spring and the second spring to synchronously move upwards or downwards through the linkage mechanism when the blocking plate rotates relative to the swing rod.

Further, the linkage mechanism comprises a toothed belt, a first fixed gear, a second fixed gear and a toothed belt pressing block; the first fixed gear is rotatably arranged on the front side surface of the oscillating bar and is positioned above the vibrating mechanism; the second fixed gear can rotate below the first fixed gear and is positioned below the vibration mechanism; the toothed belt is arranged on the first fixed gear and the second fixed gear and is meshed with the first fixed gear and the second fixed gear; the toothed belt pressing block is horizontally arranged, one end of the toothed belt pressing block is fixedly connected with the inner side of the toothed belt, the lower side of the toothed belt pressing block is fixedly connected with the upper ends of the first spring and the second spring respectively, so that when the toothed belt pressing block slides up and down, the first spring and the second spring are driven to compress or extend, and the upper end of the blocking plate is fixedly connected with the first fixed gear.

Furthermore, the number of the first springs and the number of the rotary pressing blocks are two; two first spring grooves, a second spring groove and a rotary pressing block groove are formed in the front side face of the swing rod along the length direction of the swing rod; the two first spring grooves are uniformly distributed on the swing rod, and each first spring is arranged in one first spring groove; the second spring groove is positioned between the two first spring grooves, each rotary pressing block groove is positioned at the lower end of the first spring groove and communicated with the first spring groove and the second spring groove, a rotary shaft extends out of the rotary pressing block in the front-back direction, and the rotary pressing block is rotatably installed and inserted on the rotary shaft; the second spring is arranged in the second spring groove, and the lower end of the second spring groove is positioned below the lower end of the first spring groove, so that the friction block can enter the lower end of the second spring groove when getting rid of the obstruction of the rotating pressing block.

Further, the first spring includes a first upper spring and a first lower spring; the upper end of the gravity block is fixedly connected with the lower end of the first upper spring, and the lower end of the gravity block is fixedly connected with the upper end of the first lower spring.

Further, the rotary briquette groove is provided with a rotary shaft extending in the front-rear direction. The rotary pressing block is in a long rod shape, can be rotatably arranged on the rotary shaft and is obliquely arranged in an initial state; the rotary pressing block is provided with a connecting block at the upper end, and the connecting block is fixedly connected to the rotary pressing block and the first spring.

Furthermore, a plurality of first connecting blocks and second connecting blocks are arranged on the lower side of the toothed belt pressing block; the first connecting block is slidably arranged in the first spring groove, the upper side of the first connecting block is fixedly connected with the lower side of the toothed belt pressing block, and the lower side of the first connecting block is fixedly connected with the upper side of the first spring; the second connecting block is slidably arranged in a second spring groove, the upper side of the second connecting block is fixedly connected with the lower side of the toothed belt pressing block, and the lower side of the second connecting block is fixedly connected with the upper side of the second spring.

Further, the stable support comprises a vertical rod, a mounting plate and a plurality of toothed bars; the mounting plate is in a rectangular plate shape and is horizontally arranged; the vertical rod is vertically arranged on the mounting plate, and the upper end of the swing rod is rotatably arranged at the upper end of the vertical rod; the gear rod is vertically arranged, the upper end of the gear rod is fixedly connected with the mounting plate, and the lower end of the gear rod extends downwards to form a conical structure.

The invention has the beneficial effects that: according to the levelness detection device for building construction, when the swing rod swings greatly, the gravity block is basically kept at the position close to the lower part under the action of centrifugal force, the reciprocating motion effect generated along with the compression and recovery of the first spring is small, and compared with the second spring, the force transmission lag is small. When the pendulum rod later stage is swung in a small margin, the centrifugal force that the gravity piece received diminishes, it produces obvious reciprocating motion along with the compression of first spring and recovery, make first spring compare the transmission of second spring to the force and take place obvious hysteresis, make the pressure of second spring to the clutch blocks at a certain time begin to be greater than the biggest static friction power that rotatory briquetting extruded the production to the clutch blocks both sides, the clutch blocks breaks through the lower groove section that original position got into the second spring groove, the clutch blocks is beaten back and forth in the second spring groove, make the pendulum rod constantly shake finally and swing to the position that is close vertical direction more, and then eliminate the influence of friction power to the pendulum rod and make angle measurement more accurate.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural view of an embodiment of a levelness detecting apparatus for building construction according to the present invention;

FIG. 2 is a front view of an embodiment of a levelness detecting device for building construction according to the present invention;

FIG. 3 is a side view of an embodiment of a levelness detecting apparatus for building construction according to the present invention;

FIG. 4 is a schematic structural diagram illustrating an operation process of an embodiment of a levelness detecting apparatus for building construction according to the present invention;

FIG. 5 is an enlarged view of a portion of FIG. 4 at A;

FIG. 6 is a schematic structural diagram illustrating an operation process of an embodiment of a levelness detecting apparatus for building construction according to the present invention;

FIG. 7 is a schematic structural diagram illustrating an operation process of an embodiment of a levelness detecting apparatus for building construction according to the present invention;

FIG. 8 is a schematic structural view of a stable support of an embodiment of the levelness detecting device for building construction according to the present invention;

in the figure: 1. a swing rod; 101. a first fixed gear; 102. a second fixed gear; 103. a rotating shaft; 2. a toothed belt; 201. toothed belt pressing blocks; 3. a blocking plate; 4. a first spring; 401. a gravity block; 402. connecting blocks; 403. briquetting; 5. a second spring; 501. a friction block; 6. rotating the pressing block; 7. a toothed ring; 8. a stable support; 801. a swing shaft; 802. mounting a plate; 803. a toothed bar.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The embodiment of the levelness detection device for building construction, disclosed by the invention, comprises a stable support 8, a swing rod 1, a vibration mechanism and a blocking plate 3, as shown in figures 1 to 8; the swing rod 1 is of a long rod structure, and the upper end of the swing rod is rotatably arranged at the upper end of the stable support 8; the vibration mechanism comprises two first springs 4, two rotating pressing blocks 6, a second spring 5 and a friction block 501; the first spring 4 extends on the swing rod 1 along the length direction of the swing rod 1, a gravity block 401 is arranged on the first spring 4, the gravity block 401 is arranged in the middle of the first spring 4 and divides the first spring 4 into an upper part and a lower part, the two first springs 4 are arranged in parallel, and the first springs 4 comprise first upper springs and first lower springs; the upper end of the gravity block 401 is fixedly connected with the lower end of the first upper spring, and the lower end of the gravity block 401 is fixedly connected with the upper end of the first lower spring. (ii) a The second spring 5 is telescopically arranged on the swing rod 1 along the length direction of the swing rod 1 and is positioned between the two first springs 4; the friction block 501 is slidably arranged on the swing rod 1 along the length direction of the swing rod 1 and is connected to the lower end of the second spring 5, and the friction block 501 can swing up and down to drive the swing rod 1 to vibrate through the second spring 5; the rotary pressing blocks 6 are rotatably arranged on the swing rod 1 around a reference axis extending back and forth, the rotary pressing blocks 6 are fixedly connected with the lower end of the first spring 4, the two rotary pressing blocks 6 are symmetrically arranged relative to the friction block 501, and the rotary pressing blocks 6 are configured to rotate relative to the friction block 501 to clamp the friction block 501 or loosen the friction block 501 so as to block and allow the friction block 501 to move; the upper end of the blocking plate 3 is rotatably arranged on the swing rod 1, the blocking plate 3 is in transmission connection with the upper end of the vibrating mechanism through the linkage mechanism, and therefore when the blocking plate 3 rotates relative to the swing rod 1, the upper ends of the first spring 4 and the second spring 5 are driven to synchronously move upwards or downwards through the linkage mechanism. The linkage mechanism is fixedly connected with the upper ends of the first spring 4 and the second spring 5 so as to drive the first spring 4 and the second spring 5 to compress and extend when the linkage mechanism rotates.

In this embodiment, as shown in fig. 1 to 7, the linkage mechanism includes a toothed belt 2, a first fixed gear 101, a second fixed gear 102, and a toothed belt pressing block 201; the first fixed gear 101 is rotatably arranged on the front side surface of the swing rod 1 and is positioned above the vibration mechanism; the second fixed gear 102 is rotatably arranged below the first fixed gear 101 and is positioned below the vibration mechanism; the toothed belt 2 is installed on the first fixed gear 101 and the second fixed gear 102 and is meshed with the first fixed gear 101 and the second fixed gear 102, the first fixed gear 101 and the second fixed gear 102 both comprise a fixed shaft and a toothed ring 7, and the toothed ring 7 is rotatably installed on the fixed shaft. Toothed belt briquetting 201 level sets up, one end just is located the left side with the inboard fixed connection of toothed belt 2, with toothed belt briquetting 201 downstream when barrier plate 3 is for pendulum rod 1 counter-clockwise turning, toothed belt briquetting 201 upstream when barrier plate 3 is for pendulum rod 1 clockwise turning, the below is provided with three connecting block 402, connecting block 402 downside respectively with first spring 4 and second spring 5's upper end fixed connection, with when toothed belt briquetting 201 slides from top to bottom, drive first spring 4 and second spring 5 compression or extension, barrier plate 3's upper end and first fixed gear 101 fixed connection.

In this embodiment, as shown in fig. 1 to 7, the number of the first springs 4 and the number of the rotating pressing pieces 6 are both two; two first spring 4 grooves, two second spring 5 grooves and a rotary pressing block 6 groove are formed in the front side face of the swing rod 1 along the length direction of the swing rod 1; two first spring 4 grooves are uniformly distributed on the swing rod 1, and each first spring 4 is arranged in one first spring 4 groove; the second spring 5 groove is positioned between the two first spring 4 grooves, each rotary pressing block 6 groove is positioned at the lower end of the first spring 4 groove and communicated with the first spring 4 groove and the second spring 5 groove, a rotary shaft 103 extends out of the rotary pressing block 6 in the front-back direction, and the rotary pressing block 6 is rotatably installed and inserted on the rotary shaft 103; the second spring 5 is installed in the second spring 5 groove, and the lower end of the second spring 5 groove is positioned below the lower end of the first spring 4 groove, so that the friction block 501 can enter the lower end of the second spring 5 groove when getting rid of the obstruction of the rotating pressing block 6. The rotary press block 6 is provided with a rotary shaft 103, and the rotary shaft 103 extends in the front-rear direction. The rotary pressing block 6 is in a long rod shape, can be rotatably arranged on the rotary shaft 103, and is obliquely arranged in an initial state; the upper end of the rotating pressing block 6 is provided with a pressing block 403, and the pressing block 403 is fixedly connected with the rotating pressing block 6 and the first lower spring.

In the present embodiment, as shown in fig. 1 to 7, the three connection blocks 402 include two first connection blocks 402 and one second connection block 402; the first connecting block 402 is slidably arranged in the groove of the first spring 4, the upper side of the first connecting block is fixedly connected with the lower side of the toothed belt pressing block 201, and the lower side of the first connecting block is fixedly connected with the upper side of the first spring 4; the second connecting block 402 is slidably installed in the groove of the second spring 5, the upper side of the second connecting block is fixedly connected with the lower side of the toothed belt pressing block 201, and the lower side of the second connecting block is fixedly connected with the upper side of the second spring 5. The first connecting block 402 and the second connecting block 402 are higher than the groove depth of the first spring 4 groove and the second spring 5 groove, and the higher parts are fixedly connected with the toothed belt pressing block 201.

In this embodiment, as shown in fig. 8, the stable support 8 comprises a vertical rod, a mounting plate 802 and a plurality of toothed bars 803; the mounting plate 802 is in a rectangular plate shape and is horizontally arranged; the vertical rod is vertically arranged on the mounting plate 802, the upper end of the vertical rod is provided with a swinging shaft 801, the swinging shaft 801 extends along the front-back direction, and the upper end of the swinging rod 1 is rotatably arranged on the swinging shaft 801 of the vertical rod; the rack 803 is vertically arranged, the upper end of the rack is fixedly connected with the mounting plate 802, the lower end of the rack extends downwards to form a conical structure, and the plurality of racks 803 are downwards inserted into the bottom surface and play a role in stabilizing.

During operation, the rack 803 of the stabilizing support 8 is inserted into the ground, so that the mounting plate 802 is in a state of being tightly attached to the ground, the swing rod 1 and the blocking plate 3 are simultaneously pulled to one side and lifted to a certain height, and the pulling force is instantaneously removed, so that the swing rod 1 and the blocking plate 3 start to swing freely on the vertical rod.

When the swing rod 1 starts to swing, the swing amplitude of the swing rod 1 is larger, and when the swing rod 1 swings to a vertical position, the speed is the maximum, the centrifugal force is the maximum, and the first lower spring is in a compressed state. When the swing rod moves from a limit position on one side to a vertical position, centrifugal force gradually increases, the first lower spring is compressed, the first upper spring is stretched, the gravity block is in a downward position, meanwhile, the swing speed of the blocking plate 3 on the swing rod 1 is lower than that of the swing rod 1 due to air resistance, the blocking plate 3 rotates relative to the swing rod 1 along the clockwise direction, the toothed belt pressing block 201 moves downwards to compress the first spring 4 and the second spring 5, namely, the blocking plate 3 also compresses the first spring 4 through the toothed belt pressing block 201, and in the process, the first lower spring is always in a compression state.

When the swing rod 1 moves from the vertical position to the limit position on the other side, the first upper spring is continuously compressed, the centrifugal force of the gravity block gradually decreases, the toothed belt pressing block 201 always moves downwards to press the first spring 4 and the second spring 5, in the process, the first lower spring is always in a compressed state, and the friction block 501 is in a clamped state.

When the swing rod 1 swings back from the highest position, the blocking plate 3 can reach the highest position at the same time and along with the swinging back, the blocking plate 3 rotates relative to the swing rod 1 along the other clockwise direction, the toothed belt pressing block 201 moves upwards, and the first spring 4 and the second spring 5 recover. Meanwhile, the speed of the swing rod 1 is lower near the highest position, the centrifugal force of the gravity block 401 is lower, and the toothed belt pressing block 201 drives the gravity block 401 to move upwards. At the moment that the blocking plate 3 rotates in the other clockwise direction relative to the swing link 1, the change of the movement direction of the gravity block 401 lags behind relative to the toothed belt pressing block 201, and at this moment, when the toothed belt pressing block 201 returns upwards with the spring, the gravity block 401 moves downwards to press the first lower spring, so that the friction block 501 is in a clamping state. When the swing rod 1 passes through the vertical position, the speed is fastest, the gravity block 401 is subjected to the maximum centrifugal force, the gravity block 401 is subjected to the upward pulling force and the downward centrifugal force of the toothed belt pressing block 201 at the moment, the gravity block 401 can be located at the downward position due to the centrifugal force, the first lower spring is compressed, the first lower spring exerts downward force on the rotating pressing block 6, and the friction block 501 is clamped in the process. When the swing rod 1 swings to a position close to the limit position, centrifugal force gradually decreases until the centrifugal force disappears, the first spring 4 and the second spring 5 continue to recover, the gravity block moves upwards along with the toothed belt press block, the extrusion force of the rotating press block 6 on the friction block 501 decreases, the friction block 501 has certain gravity, and in the process, the original position of the friction block 501 can be basically kept unchanged.

When the swing rod 1 swings back from the highest position of the other side, the blocking plate 3 also swings back from the highest position, the blocking plate 3 rotates relative to the swing rod 1 in the other clockwise direction again, the toothed belt pressing block 201 moves downwards at the moment, and the first spring 4 and the second spring 5 start to be compressed. Because the included angle between the barrier plate 3 and the swing rod 1 is large at this moment, the air resistance received by the barrier plate 3 when the barrier plate 3 rotates is small, when the swing rod 1 swings back, the change process of the relative rotation direction of the barrier plate 3 and the swing rod 1 is gentle, the gravity block moves downwards when the toothed belt press block 201 moves downwards, the first lower spring is compressed, and the friction block 501 is in a clamping state. After the swing rod 1 swings for a certain time, the swing amplitude of the swing rod 1 gradually decreases, the swing amplitude of the reciprocating swing of the swing rod 1 decreases, the frequency becomes high, the centrifugal force applied to the gravity block 401 on the first spring 4 decreases, and when the swing rod 1 swings to the vertical position, the stretching amount of the first upper spring by the gravity block 401 and the compression amount of the first lower spring both decrease. In the process of small-amplitude swinging of the swing rod 1, the barrier plate 3 is influenced by the swing rod 1 to swing in a small amplitude at the same time. When the swing rod 1 swings back from the highest position of the state, the blocking plate 3 can also swing for a period of time along the original swinging direction in a decelerating manner, the toothed belt pressing block 201 moves upwards in a decelerating manner, so that the gravity block 401 has a tendency of moving upwards along with the toothed belt pressing block 201, the first upper spring is quickly restored and drives the gravity block 401 to slide upwards due to the fact that the elongation of the first upper spring is reduced, the first lower spring is quickly released to be compressed and stretches the first lower spring by the gravity block 401 driven upwards, and the rotating pressing block 6 is driven to rotate outwards relative to the friction block 501, so that the friction force between the friction block 501 and the rotating pressing block 6 is minimum. When 3 swings back and drives cingulum briquetting 201 and move down as barrier plate, cingulum briquetting 201 acts on first spring down earlier, directly not act on rotatory briquetting 6, gravity piece 401 still is in the trend that makes rotatory briquetting 6 inwards rotate for clutch blocks 501, direct action in second spring 5 when cingulum briquetting 201 moves down simultaneously, because the frictional force between rotatory briquetting 6 and the clutch blocks 501 is minimum, make the clutch blocks 501 break through the primary importance under the extrusion of second spring 5, get into the lower extreme in second spring 5 groove, clutch blocks 501 make pendulum rod 1 produce the vibration in second spring 5 inslot round trip swing, make pendulum rod 1 more easily eliminate the influence of frictional force when approaching to vertical, be close to the position of vertical direction more, the contained angle between pendulum rod 1 and the montant this moment is the levelness of bottom surface promptly.

And finally, measuring the included angle between the vertical rod and the swing rod 1.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.