WO2015127905A1

WO2015127905A1 - Tension sensor, moment limiter, and crane

Info

Publication number: WO2015127905A1
Application number: PCT/CN2015/073944
Authority: WO
Inventors: 易小刚
Original assignee: 三一重工股份有限公司
Priority date: 2014-02-28
Filing date: 2015-03-10
Publication date: 2015-09-03
Also published as: CN103863959B; CN103863959A

Abstract

A tension sensor comprises a barrel (1), a sealing partition plate (2), a connection portion (3), a hydraulic detection apparatus (4), and a calculation apparatus (5). The sealing partition plate (2) is disposed on the connection portion (3). The sealing partition plate (2) partitions the barrel into a first chamber (7) and a second chamber (8). The first chamber or the second chamber is filled with hydraulic oil. The hydraulic detection apparatus (4) is used for detecting the intensity of pressure of the hydraulic oil. The calculation apparatus (5) calculates the tension according to the intensity of pressure and the stress area of the first chamber or the second chamber. The present invention is a new tension sensor provided based on a new working principle, the tension sensor can replace a traditional sensor, and has the advantages that the tension sensor is simple to produce and manufacture, has low cost, and produces a small measurement error and the like, and is especially applicable to measurement of large load. The present invention also provides a moment limiter and a crane based on the tension sensor.

Description

Tension sensor, torque limiter and crane

The present application claims priority to Chinese Patent Application No. 201410072556.1, entitled "Rally Sensor, Torque Limiter, and Crane", filed on February 28, 2014, the entire contents of in.

Technical field

The present invention mainly relates to the field of engineering machinery and force sensing technology, and in particular to a tension sensor, and a crane and a torque limiter provided with the tension sensor.

Background technique

Cranes (especially crawler cranes) and other equipment have high safety requirements for operation. Torque limiters are very important safety monitoring devices, which can monitor and record equipment operations in real time, and automatically realize overload protection and over-tilting protection. Ensure that it operates within a safe range, and alarms in the event of dangerous conditions or overloads, while cutting off the direction of danger, thus ensuring the safety of equipment and personnel.

The torque limiter is mainly composed of an angle sensor, a force sensor, a controller and a display. The pressure or tension measurement of the force sensor is the key to the calculation and control of the torque limiter. In the prior art, the force sensor mostly adopts a variable amplitude force, and the force taking manner is generally a press type or a pull type.

The force is taken by the squeeze pressure sensor after the pulley frame is pressed to detect the force state, but the pressure sensor must ensure vertical force, and the lateral force is not allowed, so the manufacturing requirements are high. Moreover, there is a phenomenon that the gap between the sensor and the pin is too large during the manufacturing process, resulting in a large difference in the force of the sensor when the arm is lifted, thereby causing an excessive display error of the hanging weight and an unstable display problem, which is in the field of cranes. The application is gradually decreasing.

The pulling force is used to pull the tension sensor after the force is applied by the variable tension member (such as the slinger, the pull plate or the drawstring, etc.), thereby measuring the stress state of the boom, which is convenient for installation and debugging, and only needs to maintain the tension sensor Consistent with the direction of the variable-width tension member, the measurement accuracy can be ensured, and the tendency of the torque change during the landing arm is consistent.

However, current tension sensors are generally based on resistance strain gauges, resistance strain gauges. When the external force is deformed, the resistance value will change accordingly. After the corresponding measuring circuit, the resistance change can be converted into an electrical signal, thereby completing the process of converting the external force into an electrical signal. Its shortcoming is that it has large nonlinearity for large strain and weak output signal, so the measurement error is large and the reliability is poor. For cranes with large tonnage, the disadvantages are more obvious. Moreover, the internal structure of the tension sensor is complicated, manufacturing is difficult, and the price is expensive, which increases the manufacturing cost of equipment such as cranes.

Therefore, how to provide a high-reliability, low-cost, convenient manufacturing tension sensor to replace the traditional resistance strain gauge-based sensor and apply it to equipment such as cranes is a technical problem to be solved by those skilled in the art.

Summary of the invention

In view of this, the present invention provides a tension sensor, which can solve the defects or at least one of the prior art sensor measurement error, poor reliability, difficult manufacturing, and high price.

The tension sensor of the present invention comprises a cylinder, a sealing partition, a connecting portion, a hydraulic detecting device and a computing device, wherein:

The cylinder is connected to the first tension joint, the connecting portion is connected to the second tension joint, the sealing partition is disposed on the connecting portion, and the sealing partition divides the cylinder into the first chamber And the second chamber, the first chamber or the second chamber is filled with hydraulic oil;

The hydraulic pressure detecting device is configured to detect a pressure of the hydraulic oil;

The calculating device calculates the tensile force according to the pressure and the force receiving area of the first chamber or the second chamber.

Further, the amount of hydraulic oil in the first chamber or the second chamber does not change at the time of tensile force detection.

Further, the cylinder body is provided with a mounting hole, the mounting hole is on the same side of the chamber filled with the hydraulic oil, and the hydraulic detecting device is inserted into the mounting hole.

Further, the cylinder is further provided with a breathing port communicating with the atmosphere, and the breathing port is located on the same side as the chamber not filled with hydraulic oil.

Further, the barrel includes a barrel body, a second chamber flange at both ends of the barrel body and a first chamber flange, and the second chamber flange is screwed to the barrel body, the first chamber The flange is welded to the barrel.

Further, the second chamber flange is provided with an inner portion for connecting with the first tension joint Threaded or externally threaded, the end of the joint is also provided with internal or external threads for connection to the second tension joint.

Further, the second chamber flange and the first tension joint are further reinforced by welding, and the connecting portion and the second tension joint are also reinforced by welding.

Further, the second chamber flange is integrally formed with the first tension joint, and the connecting portion and the second tension joint are also integrally formed.

Another aspect of the present invention provides a torque limiter including an angle sensor, a controller, and further comprising a tension sensor of any of the foregoing, the controller connecting the angle sensor and the tension sensor, and according to Angle and tension size to monitor equipment conditions.

In still another aspect of the invention, a crane is provided, comprising a torque limiter comprising a tension sensor of any of the foregoing, the tension sensor being coupled to a tension member of the crane.

The tension sensor of the present invention comprises a cylinder body, a sealing partition plate, a connecting portion, a hydraulic detecting device and a calculating device, and the pulling force is obtained based on a product of a hydraulic oil pressure and a force receiving area. The new tension sensor can be widely used in a variety of tension detection applications, and can replace the traditional strain gauge based tensile force sensor.

The hydraulic detecting device of the present invention can be used with a small-sized pressure sensor which is low in cost, and is not only easy to manufacture and implement, but also can greatly reduce the cost, compared with the prior art resistance strain gauge type tensile sensor.

It should be noted that when the rated load is larger, the resistance strain gauge type tensile sensor has higher requirements on components and is more difficult to manufacture, and the increase in manufacturing difficulty and cost of the tension sensor of the present invention is not obvious, so The invention has a more significant advantage when applied to large loads.

In addition, the tension sensor of the present invention exerts a small stroke when the tensile force changes, and the hydraulic oil is subjected to a small stroke. Since the hydraulic oil has a strong pressure bearing capability, the deformation and pressure values of the hydraulic oil have a linear law even when the force is large, as opposed to The resistance strain gauge type tensile sensor has small measurement error and high reliability.

The torque limiter of the invention can measure the tensile force in time and accurately by using the new tension sensor, and can ensure the measurement accuracy even when the load is large, and the torque limiter can monitor the equipment operation in real time according to the measurement data. This ensures that the equipment operates within a safe range, especially for the safe monitoring of large tonnage cranes.

DRAWINGS

The accompanying drawings, which are incorporated in the claims In the drawing:

1 is a schematic structural view of a tension sensor according to an embodiment of the present invention;

Figure 2 is a schematic structural view of a connecting portion of the embodiment shown in Figure 1;

Figure 3 is a schematic view showing the structure of the barrel portion of the embodiment shown in Figure 1;

Fig. 4 is a schematic structural view of a crane according to an embodiment of the present invention.

Description of the reference signs:

Cylinder-1 Sealed Separator-2

Connection section-3 hydraulic detection device-4

Computing device-5 first tension connector-61

Second tension connector -62 first room-7

Second Chamber-8 Tensioned Parts-9

detailed description

The present invention will be further described in detail below with reference to the drawings and specific embodiments.

In the present invention, the terms "first" and "second" are mainly used to distinguish different components, but the components are not specifically limited.

1 is a schematic structural view of a tensile force sensor according to an embodiment of the present invention, FIG. 2 is a schematic structural view of a connecting portion of the embodiment shown in FIG. 1, and FIG. 3 is a schematic structural view of a cylindrical portion of the embodiment shown in FIG. . As seen from the respective figures, the tension sensor of this embodiment includes a barrel 1, a sealing partition 2, a connecting portion 3, a hydraulic pressure detecting device 4, and a computing device 5.

Wherein, the cylinder 1 is connected to the first tension joint 61, the connecting portion 3 is connected to the second tension joint 62, and the sealing partition 2 is disposed on the connecting portion 3, and the sealing partition 2 divides the cylinder 1 into the first chamber 7 and Second room 8. During operation, a pulling force is applied to the barrel 1 and the connecting portion 3 through the first tension joint 61 and the second tension joint 62, respectively.

The first tension link 61 and the second tension link 62 serve primarily as a connection, which can take a variety of possible configurations. As shown in FIG. 1 , it is preferable to provide a connection hole on each joint, and integrally form a lifting ring structure, so that the tension sensor can be integrally formed into a universal structure, which is convenient for installation and disassembly, and can be widely applied to various occasions for detecting tensile force. Such as the construction industry, lifting equipment, sports equipment and so on.

The tension sensor of this embodiment may be filled with hydraulic oil in the first chamber 7, or may be filled with hydraulic oil in the second chamber 8, as long as the hydraulic oil is subjected to tension and is squeezed during operation to cause tension due to the tension. Different from each other, different hydraulic oil pressures are generated, that is, the technical effects of the present invention can be achieved. The hydraulic fluid can be a hydraulic medium used in prior art hydraulic systems.

It should be understood that the tension sensor of this embodiment of the present invention does not have an inlet and outlet port on the cylinder 1, and the amount of hydraulic oil in the first chamber 7 or the second chamber 8 does not change during the operation of the tension detection. In addition, the tension sensor is subjected to tensile force during operation, and the action of the sealing partition 2 and the connecting portion 3 is caused by the deformation of the hydraulic oil, which is a passive movement of a small stroke (generally only a few millimeters).

The aforementioned hydraulic pressure detecting device 4 is for detecting the pressure of the hydraulic oil, which may have a detecting end which protrudes into the hydraulic oil. The hydraulic pressure detecting device 4 may be a device such as a pressure gauge, which is preferably a sensor that converts a pressure signal into an electrical signal, such as an inductive pressure sensor, a capacitive pressure sensor, etc., and more preferably a pressure gauge based pressure sensor.

The pressure gauge based pressure sensor has the advantages of extremely low price, high precision and good linearity. The resistance strain gauge of the pressure sensor is deformed according to the pressure of the hydraulic oil, and the resistance value thereof will change accordingly. After the corresponding measuring circuit, the resistance change can be converted into an electrical signal, thereby completing the conversion of the hydraulic oil pressure into The process of electrical signals.

The hydraulic detecting device 4 can have various possible outer structures, and can be built in the first chamber 7 or the second chamber 8 in terms of specific mounting, or can be disposed on the cylinder 1 and with the first chamber 7 or the second Room 8 is connected. In order to facilitate installation, maintenance, and replacement, and to ensure the strength of the output signal, it is preferable to install a mounting hole in the cylinder 1, the mounting hole is on the same side of the chamber filled with the hydraulic oil, and the hydraulic detecting device 4 is inserted into the mounting hole. .

The aforementioned computing device 5 is connected to the hydraulic pressure detecting device 4, and calculates the tensile force according to the pressure measured by the hydraulic pressure detecting device 4 and the force receiving area of the first chamber 7 or the second chamber 8. Further, it is preferable that the amount of hydraulic oil in the first chamber or the second chamber does not change at the time of the tensile force detection. The magnitude of the pulling force can be pressure The product of the strong and the stressed area can also be corrected on the basis of the product. The force receiving area of the second chamber 8 may be the cross-sectional area of the sealing partition 2 (or the inner ring area of the cylinder 1), and the force receiving area of the first chamber 7 may be the cross-sectional area of the sealing partition 2 minus The cross-sectional area of the connecting portion 3.

The above embodiment provides a novel tension sensor that derives the magnitude of the tension based on the product of the hydraulic oil pressure and the area of the force. The tension sensor uses a new measurement method and working principle, can be widely used in a variety of tension detection applications, and can replace the traditional resistance strain gauge based tensile sensor.

Since the hydraulic detecting device 4 can select a small pressure sensor with low price, compared with the prior art resistance strain gauge tensile sensor, not only is the manufacturing simple, the implementation is easy, and the cost can be greatly reduced.

It should be noted that when the rated load is larger, the resistance strain gauge type tensile sensor has higher requirements on components and is more difficult to manufacture, and the tension sensor of the above embodiment is not obvious in manufacturing difficulty and cost, so The above embodiment has a more significant advantage when applied to large loads.

In addition, when the tension force changes, the hydraulic oil is subjected to force and generates a slight stroke. Due to the strong pressure bearing capacity of the hydraulic oil, the deformation and pressure value of the hydraulic oil have a linear law even when the force is large, relative to the resistance strain. For the chip tension sensor, the measurement error is small and the reliability is high.

In the tension sensor of the above embodiment, the hydraulic oil filled in the first chamber 7 or the second chamber 8 can be preset during the manufacturing process. Further, in order to facilitate the inspection and replacement of the hydraulic oil, the first chamber 7 or the second chamber 8 may be provided with an oil filling port through which the manufacturer or the maintenance personnel can fill the hydraulic oil. It should be clear that the oil filling port is in a closed state during the operation of the tension sensor to detect the pulling force.

Further, the cylinder 1 is further provided with a breathing port communicating with the atmosphere, and the breathing port is located on the same side as the chamber not filled with the hydraulic oil. When the first chamber 7 is filled with hydraulic oil, the breathing port is in communication with the second chamber 8; when the second chamber 8 is filled with hydraulic oil, the breathing port is in communication with the first chamber 7. Since the breathing port is provided, the chamber not filled with the hydraulic oil can be maintained at atmospheric pressure, and the positive pressure or the negative pressure of the chamber is prevented from affecting the hydraulic oil pressure, thereby ensuring measurement accuracy and reliability.

The cylinder 1 of the present invention preferably has a cylindrical structure, and the sealing partition 2 preferably has a cylindrical structure. A plurality of can be used between the cylinder 1, the connecting portion 3, the first tension joint 61 and the second tension joint 62 Structure and installation process. Most preferably, the barrel 1 includes a barrel, a second chamber flange at the ends of the barrel, and a first chamber flange, the second chamber flange being threadedly coupled to the barrel, and the first chamber flange being welded to the barrel. For this structure, hydraulic oil is preferably filled in the first chamber 7.

The first chamber flange is welded to the barrel body to ensure the sealing of the first chamber 7 and improve the strength and rigidity of the structure. The second chamber flange is screwed to the barrel body for easy loading and unloading and maintenance. Wherein, the second chamber flange may be provided with an external thread, and the inner wall of the barrel body is provided with an internal thread matched with the external thread.

Furthermore, the second chamber flange is connected to the first tension joint 61, which can have a variety of possible connections. As an embodiment, the second chamber flange is integrally formed with the first tension joint 61, which may be subjected to an integral blanking process. As another embodiment, the second chamber flange is provided with internal or external threads for connection to the first tension joint 61. Further, in order to improve the connection stability, it is ensured that no looseness occurs when subjected to a large load pulling force, and it is preferable to also be reinforced by welding between the second chamber flange and the first tension joint 61.

Likewise, there may be multiple possible connections between the end of the connecting portion 3 and the second tension tab 62. Similar to the second chamber flange, the connecting portion 3 and the second tension joint 62 may be integrally formed, and an integral blanking process may be employed. As an alternative, the end of the connecting portion 3 is also provided with internal or external threads for connection to the second tension joint 62, and may also be reinforced between the connecting portion 3 and the second tensioning joint 62 by welding. .

In addition to the novel tension sensor of the foregoing embodiment, the present invention also provides a torque limiter provided with the tension sensor of this embodiment. The torque limiter also includes an angle sensor and a controller. The controller is connected to the angle sensor and the tension sensor, and monitors the condition of the equipment according to the angle and the pulling force. The torque sensor may also include other structures such as a length sensor and a display. Each part may refer to existing and improved technologies, and details are not described herein.

Fig. 4 is a schematic view showing the structure of a crane according to an embodiment of the present invention. The crane comprises a torque limiter, the tension sensor of which is connected to the tension member 9 of the crane. The tension member 9 can be, for example, a horn rod, a pull plate or a drawstring.

The tension sensor can be connected in series between the tension member 9 or to the end of the tension member 9. Just keep the tension sensor in line with the tension member 9 to ensure measurement accuracy.

Thanks to the use of the new tension sensor, the tension can be measured in a timely and accurate manner, and the measurement accuracy can be ensured even when the load is large. The torque limiter can be used according to the measurement data. The operation is monitored in real time to ensure that the equipment operates within a safe range, especially for the safe monitoring of large tonnage cranes, and more preferably for crawler cranes.

The above description is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

A tension sensor is characterized by comprising a cylinder (1), a sealing partition (2), a connecting portion (3), a hydraulic detecting device (4) and a computing device (5), wherein:

The cylinder (1) is connected to the first tension joint (61), the connecting portion (3) is connected to the second tension joint (62), and the sealing partition (2) is disposed at the connecting portion (3) The sealing partition (2) divides the cylinder (1) into a first chamber (7) and a second chamber (8), the first chamber (7) or the second chamber ( 8) filled with hydraulic oil;

The hydraulic pressure detecting device (4) is configured to detect a pressure of the hydraulic oil;

The calculating device (5) calculates the tensile force according to the pressure and the area of the force of the first chamber (7) or the second chamber (8).
The tension sensor according to claim 1, characterized in that the amount of hydraulic oil in the first chamber (7) or the second chamber (8) does not change at the time of tension detection.
The tension sensor according to claim 1, wherein the cylinder body (1) is provided with a mounting hole, the mounting hole is on the same side as the chamber filled with hydraulic oil, and the hydraulic detecting device (4) Inserted into the mounting hole.
The tension sensor according to claim 1, characterized in that the cylinder (1) is further provided with a breathing port communicating with the atmosphere, the breathing port being located on the same side as the chamber not filled with hydraulic oil.
The tension sensor according to any one of claims 1 to 4, characterized in that the cylinder (1) comprises a barrel body, a first chamber flange and a second chamber flange at both ends of the barrel body, The first chamber flange is welded to the barrel, and the second chamber flange is threadedly coupled to the barrel.
The tension sensor according to claim 5, wherein the second chamber flange is provided with internal or external threads for connection with the first tension joint (61), the connecting portion (3) The end is also provided with internal or external threads for connection to the second tension joint (62).
The tension sensor according to claim 6, wherein the second chamber flange and the first tension joint (61) are further reinforced by welding, the connecting portion (3) and the first The two tension connectors (62) are also reinforced by welding.
The tension sensor of claim 5 wherein said second chamber flange Formed integrally with the first tension joint (61), the connecting portion (3) and the second tension joint (62) are also integrally formed.
A torque limiter comprising an angle sensor and a controller, characterized by further comprising the tension sensor according to any one of claims 1-8, wherein the controller connects the angle sensor and the tension sensor, and according to Angle and tension size to monitor equipment conditions.
A crane comprising a torque limiter, characterized in that the torque limiter comprises a tension sensor according to any one of claims 1-8, the tension sensor being connected to a tension member (9) of the crane .