Crane supporting leg position detection device and detection system

Abstract

The utility model provides a crane supporting leg position detection device and a detection system, and belongs to the technical field of engineering machinery. The technical problem that in the prior art, a magnetostrictive sensor is arranged in a supporting leg so that disassembly, assembly and maintenance are inconvenient is solved. According to the technical scheme, the crane landing leg position detection device comprises a guide flange arranged on the outer wall of a landing leg oil cylinder barrel and a supporting piece arranged at the end of a landing leg oil cylinder rod, a magnetostriction sensor is arranged on the side, away from the landing leg oil cylinder barrel, of the supporting piece, and a piston rod is arranged on the guide flange; the end, close to the supporting piece, of the piston rod is provided with a magnetic ring, the piston rod, the magnetostrictive sensor and the magnetic ring are coaxially arranged, and the crane supporting leg position detection system comprises the detection device. The detection device has the advantages that the detection device is arranged outside the supporting leg oil cylinder, the magnetostriction sensor is arranged in the detection device, maintenance is convenient, and meanwhile the reliability of the magnetostriction sensor is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of engineering vehicles, in particular to a crane outrigger position detection device and a detection system. Background Art

[0002] The outrigger is one of the main parts of the truck crane. When the crane is in operation, in order to provide sufficient support span and support strength, improve the anti-overturning stability of the vehicle, and thus improve the lifting capacity, the outrigger needs to be extended. The outrigger has horizontal telescopic (or swing telescopic) and vertical telescopic functions, which are generally achieved through mechanisms such as hydraulic cylinders.

[0003] Due to the complexity and non-selectivity of the work site, it is often encountered that the crane outriggers cannot be extended and retracted symmetrically. For this reason, the industry has developed a new working condition, the asymmetric outrigger working condition. Under this working condition, the crane's outriggers can be extended to any position, and the crane provides corresponding operating performance according to the length of the outriggers. Outrigger position detection is a prerequisite for the asymmetric working condition.

[0004] In addition, the European crane standard EN13000 also explicitly requires that the horizontal position of the outriggers should be monitored during operation. When the horizontal position does not match the selected crane configuration, an audible and visual alarm will be issued to the operator. Cranes sold to the high-end European market must meet this standard requirement.

[0005] Currently, existing outrigger position detection usually uses a pull-rope sensor or an outrigger cylinder with a built-in magnetostrictive sensor.

[0006] Prior art 1: Figure 4 As shown, a pull-rope sensor is used to detect the position of the outrigger. The pull-rope sensor is composed of a wire rope, a drum, a coil spring, a gear, a potentiometer, a conversion circuit, etc. The pull-rope sensor 4 is installed on the fixed outrigger 2, and one end of the sensor's wire rope 5 is fixed on the sensor drum, and the other end is hung on the movable outrigger 1. The wire rope 5 wound on the sensor drum is pulled in as the movable outrigger 1 extends and retracts, thereby driving the potentiometer on the drum to measure the corresponding electrical signal value. After receiving the electrical signal, the body controller 6 calculates the extended length of the outrigger and transmits it to the display 7 to display the current outrigger position information in real time. When the actual position of the detected outrigger is inconsistent with the outrigger position required by the selected working condition, the body controller 6 sends an audible and visual alarm signal through the display 7 to remind the operator.

[0007] Prior art 2: Figure 5 and 6 As shown in Figure 1, a magnetostrictive sensor is installed in the outrigger cylinder. Figure 3As shown in the figure, it consists of an outrigger oil cylinder with a built-in magnetostrictive sensor, a controller, a display, etc. The magnetostrictive effect is generated by the telescopic movement of the outrigger oil cylinder, and the magnetostrictive principle is used to detect the outrigger position. Figure 2 As shown, it includes a cylinder 1, a piston rod 2, a piston 3, a magnetic ring 4, and a magnetostrictive displacement sensor 5. The magnetic ring is fixed on the piston rod, and the magnetostrictive sensor is fixed on the cylinder. When the movable leg is extended or retracted, the piston moves relative to the cylinder, that is, the magnetic ring moves relative to the sensor measuring rod. At this time, the magnetic field of the magnetic ring and the measuring rod intersect to generate a strain pulse signal, which is transmitted at a fixed sound speed. By calculating the time period required for this signal to be detected, the displacement of the piston is obtained. After receiving the piston displacement signal sent by the magnetostrictive sensor, the body controller can calculate the length of the outrigger extension and transmit it to the display to display the current outrigger position information in real time. When the actual position of the detected outrigger is inconsistent with the outrigger position required by the selected working condition, the body controller sends an audible and visual alarm signal through the display to remind the operator.

[0008] Disadvantages of the prior art:

[0009] 1. In the prior art 1, when the movable leg is extended or retracted, a large vibration will be generated, and the sensor rope will jump accordingly, resulting in inaccurate values, and the rope is easy to fall off the track, causing it to get stuck or break; the rope is exposed to the outside for a long time, and it is easy to be attached with dust, and the pulling resistance is large, causing it to get stuck or break; there are moving hydraulic pipelines inside the movable leg, and the rope is easily squeezed and broken by the hydraulic pipeline when the movable leg is extended or retracted; the sensor is large in size, and the space of the fixed leg is limited, making it difficult to arrange.

[0010] 2. In the prior art 2, the magnetostrictive displacement sensor is built into the hydraulic cylinder, the magnetic ring is fixed on the piston rod, the magnetostrictive sensor is fixed in the cylinder, and the sensor interface is connected to the external wiring harness. However, the crane movable leg extension and retraction cylinder usually uses the piston rod as the fixed end and the cylinder as the movable end. The cylinder drives the movable leg to extend and retract. The sensor and its connecting wiring harness will follow the movement of the cylinder, which is very prone to scratches, vibrations, and wear, and the reliability is greatly reduced. In this case, the hydraulic cylinder with a built-in magnetostrictive displacement sensor will not be applicable. In addition, when the built-in magnetic sensor body is repaired and replaced, the cylinder needs to be removed from the leg and the cylinder head removed before it can be replaced. The operation is difficult and easily causes oil contamination. Utility Model Content

[0011] The utility model aims to overcome the problems in the background technology and provide a crane outrigger position detection device and a detection system which are simple to operate, convenient to maintain and have higher working reliability of the sensor.

[0012] The design concept of the utility model is: a detection device is installed outside the outrigger oil cylinder, a magnetostrictive sensor is installed inside the detection device, the telescopic movement of the outrigger oil cylinder drives the movement of the magnetic ring inside the detection device to produce a magnetostrictive effect, and the magnetostrictive principle is used to detect the outrigger position.

[0013] In order to achieve the above-mentioned purpose of the utility model, the utility model adopts a technical solution specifically as follows: a crane outrigger position detection device, comprising a guide flange arranged on the outer wall of an outrigger oil cylinder barrel and a support member arranged at the end of an outrigger oil cylinder rod, a magnetostrictive sensor is arranged on the side of the support member away from the outrigger oil cylinder barrel, a piston rod is arranged on the guide flange, a magnetic ring is arranged on one end of the piston rod close to the support member, and the piston rod, the magnetostrictive sensor and the magnetic ring are coaxially arranged.

[0014] Furthermore, a dust cover is provided on one side of the support member close to the piston rod, and the piston rod is slidably arranged on one end close to the support member and extends into the dust cover. A guide sleeve is provided in the dust cover, and the piston rod slides through the guide sleeve. The arrangement of the dust cover and the guide sleeve can, on the one hand, play a dust-proof role, and on the other hand, can limit and guide the piston rod.

[0015] Furthermore, a bearing seat is provided on the outer wall of the support leg cylinder, and a bearing ball is provided on the bearing seat. The end of the piston rod away from the support member slides through the guide flange and is connected to one end of the bearing rod. The other end of the bearing rod is movably connected to the bearing ball. The guide flange and the bearing seat are fixed on the cylinder barrel of the support leg cylinder, which support and guide the piston rod. The bearing rod and the bearing ball at the end can offset the lateral force of the piston rod during the movement process, thereby increasing its stability.

[0016] Furthermore, a piston is arranged at one end of the piston rod close to the support member, and the magnetic ring is mounted on the piston. This arrangement is convenient for installation and is firmly installed.

[0017] Furthermore, an earring is provided at the end of the cylinder rod of the outrigger oil cylinder, and the support member is arranged on the earring. The earring is used to fix the cylinder rod of the outrigger oil cylinder on the one hand, and is used as a mounting carrier of the support member on the other hand.

[0018] Furthermore, the magnetostrictive sensor is threadedly connected to the support member, which is convenient for disassembly and assembly and maintenance.

[0019] The utility model also provides a crane outrigger position detection system, which includes the above-mentioned crane outrigger position detection device, a body controller and a display, wherein the signal transmission end of the magnetostrictive sensor is connected to the input end of the body controller, and the output end of the body controller is connected to the input end of the display.

[0020] Compared with the prior art, the beneficial effects of the utility model are:

[0021] 1. The utility model proposes an outrigger position detection device based on an external magnetostrictive sensor. The magnetostrictive sensor is arranged outside the outrigger oil cylinder, and a spherical bearing is installed at the tail of the piston rod, which can withstand the vibration during the outrigger extension and retraction process and has high reliability. Due to the non-contact measurement characteristics of the magnetostrictive sensor, there is almost no wear and consumption, and the service life is long.

[0022] 2. The outrigger position detection device based on the external magnetostrictive sensor proposed in the utility model is easy to repair and replace. When the sensor fails, there is no need to disassemble the oil cylinder, and the sensor can be replaced online in the shutdown state, which is simple to operate.

[0023] 3. The external magnetostrictive sensor device has a wide range of applications. It can be used in situations where the cylinder is fixed and the piston rod moves, or in situations where the piston rod is fixed and the cylinder moves. It does not require changing the internal structure of the hydraulic cylinder and is easy to install.

[0024] 4. A crane outrigger position detection device, characterized in that a magnetostrictive sensor is installed on the outside of the oil cylinder, and the sensor and the small cylinder are combined together through threads, which is easy to install and replace.

[0025] 5. A crane outrigger position detection system, comprising an outrigger oil cylinder with an external magnetostrictive sensor, a body controller and a display, which can be used in situations where the cylinder barrel is fixed and the piston rod moves, and can also be used in situations where the piston rod is fixed and the cylinder barrel moves. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention.

[0027] Figure 1 It is a schematic diagram of the detection device of the utility model.

[0028] Figure 2 It is a schematic diagram of the detection system of the utility model.

[0029] Figure 3 Schematic diagram of the working principle of magnetostrictive sensor.

[0030] Figure 4 This is a schematic diagram of the rope-type leg position detection in prior art 1.

[0031] Figure 5 It is a schematic diagram of the outrigger oil cylinder with built-in magnetostrictive sensor in the prior art 2.

[0032] Figure 6It is a schematic diagram of a leg position detection system based on a built-in magnetostrictive sensor in prior art 2.

[0033] Among them, the accompanying drawings are marked as: 1, bearing seat; 2, bearing ball; 3, bearing rod; 4, guide flange; 5, guide sleeve; 6, dust cover; 7, piston rod; 8, piston; 9, magnetic ring; 10, magnetostrictive sensor; 11, earring; 12, outrigger cylinder; 13, support member. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. Of course, the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0035] Example: Figure 1 As shown, this embodiment provides a crane outrigger position detection device, including a guide flange 4 arranged on the outer wall of the outrigger oil cylinder 12, an earring 11 is arranged at the end of the cylinder rod of the outrigger oil cylinder 12, a support member 13 is arranged on the earring 11, a magnetostrictive sensor 10 is threadedly installed on the right side of the support member 13, a piston rod 7 is arranged on the guide flange 4, a piston 8 is arranged at the right end of the piston rod 7, a magnetic ring 9 is arranged on the piston 8, the piston rod 7, the magnetostrictive sensor 10 and the magnetic ring 9 are coaxially arranged, and a bearing seat 1 is also arranged on the outer wall of the outrigger oil cylinder 12, and a bearing seat 1 is arranged on the bearing seat 1 A bearing ball 2 is provided, and the left end of the piston rod 7 slides through the guide flange 4 and is connected with a bearing rod 3. The bearing rod 3 is movably connected to the bearing ball 2 8. The guide flange 4 and the bearing seat 1 are fixed on the cylinder barrel of the outrigger oil cylinder 12, which supports and guides the piston rod 7. The bearing rod 3 and the bearing ball 2 at the end can offset the lateral force of the piston rod 7 during the movement and increase its stability. When the outrigger oil cylinder 12 is extended, the cylinder barrel of the outrigger oil cylinder 12 will drive the piston rod 7 to move to the left, that is, relative movement is generated between the magnetic ring 9 and the magnetostrictive sensor 10.

[0036] A dust cover 6 is provided on the side of the support member 13 close to the piston rod 7. The end of the piston rod 7 close to the support member 13 slides into the dust cover 6. A guide sleeve 5 is provided in the dust cover 6. The piston rod 7 slides through the guide sleeve 5. The setting of the dust cover 6 and the guide sleeve 5 can, on the one hand, play a dust-proof role, and on the other hand, can limit and guide the piston rod 7.

[0037] like Figure 1 and Figure 2 As shown, the utility model also provides a crane outrigger position detection system, which includes the above-mentioned crane outrigger position detection device and the outrigger cylinder 12, and also includes a body controller and a display, wherein the signal end of the magnetostrictive sensor 10 is connected to the input end of the body controller, and the output end of the body controller is connected to the input end of the display.

[0038] The cylinder rod of the outrigger oil cylinder 12 is fixed to the fixed outrigger through the earring 11. When the movable outrigger is extended or retracted, the cylinder barrel of the outrigger oil cylinder 12 will drive the piston rod 7 of the detection device to move, that is, the magnetic ring 9 will move relative to the sensor rod. At this time, the magnetic ring 9 and the magnetic field of the sensor rod intersect to generate a strain pulse signal, which is transmitted at a fixed sound speed. By calculating the time period required for this signal to be detected, the displacement of the piston 8 can be obtained. After receiving the piston 8 displacement signal sent by the magnetostrictive sensor 10, the body controller can calculate the length of the outrigger extension, and then transmit it to the display to display the current outrigger position information in real time. When the actual position of the detected outrigger is inconsistent with the outrigger position required by the selected working condition, the body controller will send out sound and light alarm signals through the display to remind the operator.

[0039] like Figure 3 As shown, the working principle of the magnetostrictive sensor 10 used in the utility model is as follows: the magnetostrictive sensor 10 is composed of a measuring rod, an electronic chamber and a non-contact magnetic ring 9a sleeved on the measuring rod. The measuring rod is equipped with a magnetostrictive wire (waveguide wire). When working, the excitation module in the electronic chamber generates a starting excitation pulse b, which is transmitted in the waveguide wire at the speed of light, and at the same time generates a rotating magnetic field c that advances along the direction of the waveguide wire. When this rotating magnetic field c meets the permanent magnetic field d in the magnetic ring 9a, a magnetostrictive effect is generated, causing the waveguide wire to twist and generating a torsional strain pulse signal e. This pulse propagates from the generating point to both ends of the waveguide wire at the speed of sound, and the part transmitted to the end is absorbed by the damper, and the part transmitted to the excitation end is received by the detection coil g installed in the electronic chamber. The control module in the electronic chamber calculates the time difference between the excitation pulse and the received signal, and then multiplies it by the propagation speed of the torsional strain pulse in the waveguide wire (this speed is a constant value), so that the absolute position and displacement of the magnetic ring 9a can be accurately measured.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A crane leg position detection device, characterized in that: The invention comprises a guide flange (4) arranged on the outer wall of the cylinder barrel of an outrigger oil cylinder (12) and a support member (13) arranged on the end of the cylinder rod of the outrigger oil cylinder (12); a magnetostrictive sensor (10) is arranged on the side of the support member (13) away from the cylinder barrel of the outrigger oil cylinder (12); a piston rod (7) is arranged on the guide flange (4); a magnetic ring (9) is arranged on the end of the piston rod (7) close to the support member (13); and the piston rod (7), the magnetostrictive sensor (10) and the magnetic ring (9) are coaxially arranged.

2. A crane leg position detection device according to claim 1, characterized in that: A dust cover (6) is arranged on one side of the support member (13) close to the piston rod (7), and one end of the piston rod (7) close to the support member (13) is slidably arranged and extends into the dust cover (6).

3. A crane leg position detection device according to claim 2, characterized in that: A guide sleeve (5) is arranged inside the dust cover (6), and the piston rod (7) slides through the guide sleeve (5).

4. A crane leg position detection device according to claim 3, characterized in that: The outer wall of the outrigger oil cylinder (12) is also provided with a bearing seat (1), and a bearing ball (2) is provided on the bearing seat (1); the end of the piston rod (7) away from the support member (13) slides through the guide flange (4) and is connected to one end of the bearing rod (3); the other end of the bearing rod (3) is movably connected to the bearing ball (2).

5. The crane leg position detection device according to claim 1, characterized in that: A piston (8) is provided at one end of the piston rod (7) close to the support member (13), and the magnetic ring (9) is mounted on the piston (8).

6. A crane leg position detection device according to claim 1, characterized in that: An earring (11) is provided at the end of the cylinder rod of the outrigger oil cylinder (12), and the support member (13) is arranged on the earring (11).

7. A crane leg position detection device according to claim 1, characterized in that: The magnetostrictive sensor (10) is threadedly connected to the support member (13).

8. A crane leg position detection system, comprising the crane leg position detection device according to any one of claims 1 to 7, characterized in that: It also comprises a vehicle body controller and a display, wherein the signal transmission end of the magnetostrictive sensor (10) is connected to the input end of the vehicle body controller, and the output end of the vehicle body controller is connected to the input end of the display.

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