Axial force detection equipment for tower crane attachment device

Abstract

The utility model discloses axial force detection equipment for a tower crane attachment device, a pin shaft sensor is arranged between an attachment frame and an attachment rod, an attachment frame contact part and an attachment rod contact part in the pin shaft sensor are respectively connected with the attachment frame and the attachment rod, and a strain body is connected between the attachment frame contact part and the attachment rod contact part. According to the utility model, the pin shaft sensor is arranged at the joint of the tower crane attachment frame and the attachment rod, so that all-working-condition dynamic monitoring and safety early warning of the load of the tower crane attachment device are realized. According to the sensor, the strain body is adopted to sense the mechanical displacement between the rotating shaft blocks, the strain body can sense and obtain the mechanical displacement between the attachment rod and the attachment frame, the axial tension and pressure and torque changes of the attachment rod are synchronously captured in combination with a redundant detection unit of the dish-shaped elastic sheet and the flexible circuit board, the limitation of traditional static checking is broken through, and the measurement accuracy is improved. And real-time load detection of the tower crane attachment device is realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to tower crane attachment device detection technical field, concretely is a tower crane attachment device axial force detection equipment. BACKGROUND

[0002] The tower crane attachment device is a key safety component connecting the tower body and the building structure, which transmits horizontal force and torque through the attachment frame, rigid attachment rod and pre-buried support to reduce the cantilever bending moment of the tower body and prevent overturning. During the use of the tower crane attachment device, there are many dangerous conditions, for example, under the action of alternating load, the attachment device is prone to abnormal vibration phenomenon. This persistent dynamic load not only causes the progressive loosening of the connecting bolts of the attachment frame and the tower body standard section, but also causes plastic deformation or structural damage to the standard section connection node in severe cases. The wind-induced vibration effect caused by the coupling of environmental wind load and structural natural frequency can dynamically induce out-of-plane buckling instability of the super-long attachment rod. This instability is sudden and has serious destructive consequences. Therefore, it is urgent to build a real-time load monitoring system to accurately identify abnormal stress state and provide dynamic protection for the safe operation of the tower crane. SUMMARY

[0003] Therefore, in order to solve the above problems, the purpose of the utility model is to provide a tower crane attachment device axial force detection equipment, which comprises an attachment frame and an attachment rod. The corners of the attachment frame are connected to the attachment rod through a pin shaft sensor. The other end of the attachment rod away from the attachment frame is connected to a fixed building body. The pin shaft sensor comprises a coaxial attachment frame contact part and an attachment rod contact part. The attachment frame contact part is connected to the attachment frame. Two attachment rod contact parts are clamped at both ends of the attachment frame contact part. The attachment rod contact part is connected to the attachment rod. A strain body is arranged between the attachment frame contact part and the attachment rod contact part. The strain body is connected to the attachment frame contact part and the attachment rod contact part. The strain body is electrically connected to a load detection device. The strain body is used to detect the deformation of the pin shaft sensor.

[0004] Preferably, the strain body comprises a hollow cylindrical elastic sheet. At least two detectors are arranged in the cylindrical elastic sheet in the axial direction. The detector comprises a plurality of groups of detection units arranged circumferentially. The detection unit comprises a cylindrical elastic sensitive alloy sheet, a first spring and a disc-shaped elastic sensitive sheet connected in sequence. The cylindrical elastic sensitive alloy sheet protrudes from the surface of the cylindrical elastic sheet and is connected to the attachment frame contact part or the attachment rod contact part. The disc-shaped elastic sensitive sheet is arranged towards the central axis of the cylindrical elastic sheet. A flexible circuit board is arranged in the middle of the cylindrical elastic sheet. The disc-shaped elastic sensitive sheet is connected to the flexible circuit board.

[0005] Preferably, the detector comprises six groups of detection units arranged at equal intervals.

[0006] Preferably, the attachment frame contact part is provided with a clamping member at one end of the attachment rod contact part and both ends of the attachment rod contact part, the clamping member comprises a semicircular arc block, one end of the semicircular arc block extends laterally to form a cover plate, a gap is formed between the cover plate and the semicircular arc block for clamping the adjacent cover plate, and the cover plate is provided with a slot on the side facing the semicircular arc block for clamping the strain body, and one strain body is connected to two adjacent cover plates.

[0007] Preferably, the attachment frame contact part and the attachment rod contact part are connected by a memory pin.

[0008] Preferably, the attachment frame contact part comprises a first ear plate contact part and a second ear plate contact part, the first ear plate contact part and the second ear plate contact part are respectively connected to two ear plates arranged on one corner of the attachment frame, the first ear plate contact part and the second ear plate contact part are connected to each other by a clamping member, and a strain body is arranged between the first ear plate contact part and the second ear plate contact part and connected to the first ear plate contact part and the second ear plate contact part.

[0009] The utility model discloses the beneficial effect is:

[0010] The utility model discloses the pin shaft sensor between the attachment frame and the attachment rod is configured, and the attachment frame contact part and the attachment rod contact part in the pin shaft sensor are connected to the attachment frame and the attachment rod respectively, and one strain body is connected between the attachment frame contact part and the attachment rod contact part, the utility model discloses the pin shaft sensor is configured at the attachment frame and the attachment rod connecting place of tower crane, realizes the full working condition dynamic monitoring and safety early warning of tower crane attachment device load. The sensor adopts the mechanical displacement of the strain body sensing pivot block, and the strain body can sense and obtain the mechanical displacement between the attachment rod and the attachment frame, and combines the redundant detection unit of the disc spring and the flexible circuit board, and synchronously captures the axial tension and compression force and the torque change of the attachment rod, breaks through the limitation of traditional static checking, realizes the real -time load detection of tower crane attachment device. BRIEF DESCRIPTION OF DRAWINGS

[0011] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creating labor.

[0012] Figure 1 It is the structural schematic diagram of the utility model;

[0013] Figure 2 It is the structural schematic diagram of the pin shaft sensor in embodiment 1;

[0014] Figure 3Structure diagram of the contact part of the attachment frame and the contact part of the attachment rod;

[0015] Figure 4 Structure diagram of the contact part of the attachment frame and the contact part of the attachment rod in cooperation;

[0016] Figure 5 Structure diagram of the strain body;

[0017] Figure 6 Structure diagram of the pin shaft sensor in Embodiment 2;

[0018] Brief Description of Drawings: 1, attachment frame; 2, attachment rod; 3, pin shaft sensor; 31, attachment frame contact part; 311, first ear plate contact part; 312, second ear plate contact part 32, attachment rod contact part; 4, strain body; 41, cylindrical elastic sheet; 42, cylindrical elastic sensitive alloy sheet; 43, first spring; 44, disc-shaped elastic sensitive sheet; 45, memory pin; 5, flexible circuit board; 6, clamping piece; 61, semicircular block; 62, cover plate; 63, air slot; 7, detection equipment.

[0019] The implementation, functional features and advantages of the utility model will be further described with reference to the drawings in combination with embodiments. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the utility model will be clearly and completely described in combination with the drawings in the embodiments of the utility model.

[0021] In the description of the present application, it should be explained that the directions or position relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like are based on the directions or position relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as limiting the present application. The terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0022] Unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0023] Embodiment 1:

[0024] Figures 1-5 The utility model provides a tower crane attachment device axial force detection equipment, including attachment frame 1 and attachment rod 2, the corner of attachment frame 1 is connected with attachment rod 2 through pin shaft sensor 3, the other end of attachment rod 2 away from attachment frame 1 is connected to fixed building, attachment frame 1 includes four corners, so a attachment frame 1 is matched with four attachment rods 2 and four pin shaft sensors 3, forms a complete tower crane attachment device, pin shaft sensor 3 includes coaxial attachment frame contact part 31 and attachment rod contact part 32, attachment frame contact part 31 is connected to attachment frame 1, two attachment rod contact parts 32 are clamped in the both ends of attachment frame contact part 31, attachment rod contact part 32 is connected to attachment rod 2, and strain body 4 is equipped between attachment frame contact part 31 and attachment rod contact part 32, and strain body 4 is connected to attachment frame contact part 31 and attachment rod contact part 32, and strain body 4 is used to detect the deformation of pin shaft sensor 3, and strain body 4 is electrically connected to load detection equipment 8, and the load detection equipment 8 is prior art equipment, can accept the electric signal of strain body 4 feedback, is converted into visible mechanical movement, and then according to the numerical value judges whether to exceed threshold value, whether need to carry out early warning.

[0025] Strain body 4 includes hollow cylindrical elastic sheet 41, five detectors are arranged in the cylindrical elastic sheet 41 along the axial direction, the detector includes a plurality of groups of detection units arranged in the circumference, the detection unit includes column surface elastic sensitive alloy sheet 42, first spring 43 and disc-shaped elastic sensitive sheet 44 connected in sequence, the column surface elastic sensitive alloy sheet 42 extends out of the surface of cylindrical elastic sheet 41 and is connected to attachment frame contact part 31 or attachment rod contact part 32, the disc-shaped elastic sensitive sheet 44 is arranged towards the central axis of cylindrical elastic sheet 41, the first spring 43 is arranged between attachment frame contact part 31 and attachment rod contact part 32 and plays a linking role, the flexible circuit board 5 is arranged in the middle of cylindrical elastic sheet 41, the disc-shaped elastic sensitive sheet 44 is connected to the flexible circuit board 5, and the column surface elastic sensitive alloy sheet 42 and the disc-shaped elastic sensitive sheet 44 are engraved with piezoresistive sensitive circuit, the whole strain body 4 adopts a composite elastic sensitive alloy structure, which is composed of an external integral cylindrical elastic sheet 41 and an internal multi-level sensitive unit, the cylindrical elastic sheet 41 serves as a basic carrier and loads the column surface elastic sensitive alloy sheet 42, the disc-shaped elastic sensitive sheet 44 and the first spring 43 in the inside, the first spring 43 serves as a deformation carrier and forms a "spring-disk" integrated sensing module with the column surface elastic sensitive alloy sheet 42 and the disc-shaped elastic sensitive sheet 44 at both ends, a plurality of detection units obtain the deformation of each part of pin shaft sensor 3, and feed back to the flexible circuit board 5, and the flexible circuit board 5 sorts the electric signals and outputs to the external detection equipment 8, and the detection equipment 8 obtains the dynamic real-time data of axial force through the corresponding stress deformation formula.

[0026] In this embodiment, six groups of detection units are arranged in each detector, and are arranged in a circumferential array, with an included angle of 60° between adjacent two detection units, forming a three-dimensional space mechanical sensing structure.

[0027] A matching combination structure needs to be arranged between the attachment frame contact part 31 and the attachment rod contact part 32 to enable the two to be buckled, and a strain body 4 needs to be placed between the two to enable the strain body 4 to have a connection relationship with the two, to obtain the relative rotation amount between the two. Specifically, the attachment frame contact part 31 is provided with a clamping piece 6 at one end thereof facing the attachment rod contact part 32, and the attachment rod contact part 32 is also provided with a clamping piece 6 at both ends thereof. The clamping piece 6 comprises a semicircular arc block 61, one end of the semicircular arc block 61 extends laterally to form a cover plate 62, a gap is formed between the cover plate 62 and the semicircular arc block 61 for the cover plate 62 of another clamping piece 6 to be clamped into, and a hollow groove 63 is arranged on one side of the cover plate 62 facing the semicircular arc block 61 for the strain body 4 to be clamped into. One strain body 4 is connected to two adjacent cover plates 62 at the same time.

[0028] The attachment frame contact part 31 and the attachment rod contact part 32 are also connected through a memory pin 45. The deformability of the memory pin 45 enables the displacement in the gap to be not affected by the stiffness of the pin, and enables the offset amount to be accurately and non-reducingly transmitted to the strain body 4. Meanwhile, the recoverability of the memory pin 45 enables the offset amount to be reduced to zero after being stressed, and enables the memory pin 45 to be restored to the original position.

[0029] Working principle:

[0030] The device realizes real-time sensing of dynamic load through the pin shaft sensor 3 embedded at the connection position of the attachment frame 1 and the attachment rod 2. When the tower crane is running, the alternating load between the attachment rod 2 and the attachment frame 1 drives the attachment frame contact part 31 and the attachment rod contact part 32 to deform. This mechanical variable is transmitted to the strain body 4 through the semicircular arc block 61 and the cover plate 62 of the clamping piece 6, forcing the cylindrical elastic sheet 41 to produce axial compression or radial bending deformation. The strain body 4 internally adopts a “spring-dish” integrated sensing module: the cylindrical elastic sensitive alloy sheet 42 is triggered to stretch and contract by the push, driving the disc-shaped elastic sensitive sheet 44 to displace the flexible circuit board 5. The piezoresistive sensitive circuit engraved thereon changes in resistance with deformation, and six groups of circumferentially distributed (60° interval) detection units synchronously capture the three-dimensional mechanical state. The flexible circuit integrates multi-dimensional data and outputs a composite electrical signal. The elastic property of the memory pin 45 ensures that the displacement is transmitted without damage. After the external detection equipment 8 analyzes the electrical signal, the existing technology is used to calculate the stress and offset trend of the attachment rod 2. When the threshold is exceeded, various alarm and warning methods can be adopted to realize full-link closed-loop monitoring from mechanical deformation to intelligent warning, and to break through the limitations of traditional static checking.

[0031] Embodiment 2:

[0032] Figure 6The difference between the embodiment and the embodiment 1 is that the pin shaft sensor 3 of the embodiment is four-ear type, two symmetrical ear plates are arranged at the corner of the attachment frame 1, specifically, the attachment frame contact part 31 comprises a first ear plate contact part 311 and a second ear plate contact part 312, the first ear plate contact part 311 and the second ear plate contact part 312 are respectively connected to the two ear plates arranged on one corner of the attachment frame 1, the first ear plate contact part 311 and the second ear plate contact part 312 are connected to each other through the clamping piece 6, the clamping piece 6 mentioned here is the same in structure as the clamping piece 6 in the embodiment 1, a strain body 4 is arranged between the first ear plate contact part 311 and the second ear plate contact part 312, and the strain body 4 is connected to the first ear plate contact part 311 and the second ear plate contact part 312.

[0033] The above is only optional embodiments of the utility model, and does not limit the patent range of the utility model, and any equivalent structural transformation made under the inventive concept of the utility model, or direct / indirect application in other related technical fields is included in the patent protection range of the utility model.

Claims

1. A tower crane attachment device axial force detection device, characterized in that, The attachment includes an attachment frame (1) and an attachment rod (2). The corner of the attachment frame (1) is connected to the attachment rod (2) via a pin sensor (3). The other end of the attachment rod (2) away from the attachment frame (1) is connected to a fixed building. The pin sensor (3) includes a coaxial attachment frame contact part (31) and an attachment rod contact part (32). The attachment frame contact part (31) is connected to the attachment frame (1). Two attachment rod contact parts (32) are snapped into the two ends of the attachment frame contact part (31). The attachment rod contact part (32) is connected to the attachment rod (2). A strain gauge (4) is provided between the attachment frame contact part (31) and the attachment rod contact part (32). The strain gauge (4) is connected to the attachment frame contact part (31) and the attachment rod contact part (32). The strain gauge (4) is electrically connected to a load detection device (8). The strain gauge (4) is used to detect the deformation of the pin sensor (3).

2. The axial force detection equipment for the tower crane attachment device according to claim 1, characterized in that, The strain gauge (4) includes a hollow cylindrical elastic sheet (41). At least two detectors are arranged axially inside the cylindrical elastic sheet (41). The detectors include several sets of detection units arranged circumferentially. The detection units include a cylindrical elastic sensitive alloy sheet (42), a first spring (43), and a disc-shaped elastic sensitive sheet (44) connected in sequence. The cylindrical elastic sensitive alloy sheet (42) extends out of the surface of the cylindrical elastic sheet (41) and is connected to the attachment frame contact part (31) or the attachment rod contact part (32). The disc-shaped elastic sensitive sheet (44) is arranged facing the central axis of the cylindrical elastic sheet (41). A flexible circuit board (5) is provided in the middle of the cylindrical elastic sheet (41). The disc-shaped elastic sensitive sheet (44) is connected to the flexible circuit board (5).

3. The axial force detection equipment for the tower crane attachment device according to claim 2, characterized in that, The detector consists of six equally spaced detection units.

4. The axial force detection equipment for the tower crane attachment device according to claim 1, characterized in that, The attachment frame contact part (31) is provided with a locking member (6) at one end facing the attachment rod contact part (32) and at both ends of the attachment rod contact part (32). The locking member (6) includes a semi-circular block (61). One end of the semi-circular block (61) extends laterally to form a cover plate (62). A gap is formed between the cover plate (62) and the semi-circular block (61) for adjacent cover plates (62) to be inserted. The side of the cover plate (62) facing the semi-circular block (61) is provided with a slot (63) for the insertion of variants (4). One variant (4) is connected to two adjacent cover plates (62) at the same time.

5. The tower crane attachment device axial force detection equipment according to claim 4, characterized in that, The attachment frame contact part (31) and the attachment rod contact part (32) are connected by memory pins (45).

6. The axial force detection equipment for the tower crane attachment device according to claim 4, characterized in that, The attachment frame contact portion (31) includes a first ear plate contact portion (311) and a second ear plate contact portion (312). The first ear plate contact portion (311) and the second ear plate contact portion (312) are respectively connected to two ear plates provided on one of the corners of the attachment frame (1). The first ear plate contact portion (311) and the second ear plate contact portion (312) are connected to each other by a snap-fit ​​member (6). A strain gauge (4) is provided between the first ear plate contact portion (311) and the second ear plate contact portion (312). The strain gauge (4) is connected to the first ear plate contact portion (311) and the second ear plate contact portion (312).

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