Boom telescopic length detection device, boom and forklift loader

Abstract

The invention discloses a boom telescopic length detection device, a boom and a forklift lorry, the boom telescopic length detection device is used for being installed on the boom to detect the telescopic length of the boom, the boom comprises a basic boom and a telescopic boom capable of stretching relative to the basic boom, the boom telescopic length detection device comprises a stay wire sensor, and the stay wire sensor is used for detecting the telescopic length of the boom. The stay wire sensor is fixed on the basic arm, and a stay wire in the stay wire sensor bypasses at least one wire passing wheel and is fixed on the telescopic arm. According to the boom telescopic length detection device, the boom and the forklift loader, the stay wire in the stay wire sensor bypasses the at least one wire passing wheel from the stay wire sensor fixed to the basic boom to be fixed to the telescopic boom, the stay wire sensor can be installed at any position of the basic boom through steering of the wire passing wheel, the installation adaptability is high, and the detection accuracy is high. Therefore, the service life of the detection device can be prolonged, and the detection reliability of the detection device can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of mechanical equipment, and particularly to a boom telescopic length detection device, a boom, and a forklift truck. Background Art

[0002] As a load-carrying transportation tool, safety is very important for a forklift truck, especially when it is telescoping with different loads, the control of the telescopic length is particularly important, which affects the stability of the whole vehicle.

[0003] At present, the wire rope sensor of the forklift truck on the market is arranged on the outer side of the boom and runs linearly. This device has the following safety hazard problems: one is the problem of being broken by collision: the wire rope sensor is arranged on the outer side of the boom and is easily damaged by collision when loading goods; the other is the problem of the failure of unilateral wire rope breakage detection: when the boom is telescoping rapidly, the wire rope sensor may skip the rope due to the vibration of the boom, resulting in the wire rope not being able to retract smoothly, and thus the detection result is inaccurate and the wire rope sensor is damaged, etc. Summary of the Invention

[0004] In order to solve the above technical problems, the object of the present invention is to provide a boom telescopic length detection device, a boom, and a forklift truck that can improve the detection reliability.

[0005] The technical solution provided by the present invention is as follows: A boom telescopic length detection device is used to be installed on a boom to detect the telescopic length of the boom. The boom includes a basic boom and a telescopic boom that can telescope relative to the basic boom. The boom telescopic length detection device includes a wire rope sensor. The wire rope sensor is fixed on the basic boom, and the wire rope in the wire rope sensor bypasses at least one wire passing wheel and is fixed on the telescopic boom.

[0006] Preferably, it further includes a wire passing wheel mounting plate fixed on the basic boom. The boom telescopic length detection device includes a first wire passing wheel and a second wire passing wheel. The first wire passing wheel and the second wire passing wheel are rotatably mounted on the wire passing wheel mounting plate, and the wire rope winds from the upper surface of the first wire passing wheel to the lower surface of the second wire passing wheel and then is fixed on the telescopic boom.

[0007] Preferably, it further includes a rotating shaft and an elastic member. The rotating shaft is fixed on the basic boom, the wire passing wheel mounting plate is pivotally connected to the rotating shaft, and two ends of the elastic member are respectively connected to the wire passing wheel mounting plate and the basic boom. When the telescopic boom extends forward relative to the basic boom and pulls out the wire rope, driving the wire passing wheel mounting plate to rotate, the elastic member is stretched, generating a pulling force on the wire passing wheel mounting plate, and thus providing a pre-tightening force for the wire rope.

[0008] Preferably, a contact sensor is further included. The contact sensor is fixed on the basic arm and has a preset detection distance from the wire passing wheel mounting plate, so that when the length sensor fails and the wire cannot be retracted in time, the elastic member pulls the wire passing wheel mounting plate to rotate until it contacts the contact sensor and triggers an alarm.

[0009] Preferably, the elastic member is a spring and is fixed on the basic arm through a spring fixing member.

[0010] Preferably, the wire pulling sensor is located in the boom hinge point cavity.

[0011] Preferably, the wire pulling sensor is fixed on the upper surface of the basic arm through a mounting seat.

[0012] Preferably, the wire is fixed on the telescopic arm through a fixing screw.

[0013] A boom includes a basic arm, a telescopic arm, and the boom telescopic length detection device as described above.

[0014] A forklift truck includes the boom as described above.

[0015] Compared with the prior art, in the boom telescopic length detection device, boom, and forklift truck of the present invention, the wire in the wire pulling sensor bypasses at least one wire passing wheel fixed on the telescopic arm from the wire pulling sensor fixed on the basic arm. Due to the rotation direction of the wire passing wheel, the wire pulling sensor can be installed at any position on the basic arm, with strong installation adaptability and can avoid being damaged by collision, thereby improving the service life and detection reliability of the detection device. Moreover, by providing a first wire passing wheel, a second wire passing wheel, a wire passing wheel mounting plate, a rotating shaft, an elastic member, etc., when the telescopic arm extends forward relative to the basic arm and pulls out the wire, driving the wire passing wheel mounting plate to rotate, the elastic member is stretched, generating a pulling force on the wire passing wheel mounting plate, and further providing a pre-tightening force for the wire, which can effectively prevent the risk of skipping caused by the shaking of the boom and further improve the detection reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for description in the embodiments or the prior art. Obviously, the drawings described below are only some embodiments recorded in the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 It is a schematic structural diagram of the boom in the embodiment of the present invention.

[0018] In the figure, 1 is the basic arm; 2 is the telescopic arm; 3 is the mounting base; 4 is the wire-pulling sensor; 5 is the wire; 6 is the first wire-passing pulley; 7 is the wire-passing pulley mounting plate; 8 is the rotating shaft; 9 is the second wire-passing pulley; 10 is the fixing screw; 11 is the spring fixing part; 12 is the spring; 13 is the contact sensor; 14 is the second pin shaft; 15 is the first pin shaft; 16 is the boom hinge point cavity. Detailed implementation mode

[0019] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0020] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly disposed on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0021] It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to this application.

[0022] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, "a plurality of" and "several" mean two or more, unless otherwise specifically defined.

[0023] It should be noted that the structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in this technology to understand and read, and are not used to limit the limited conditions under which this application can be implemented. Therefore, they do not have a substantial technical meaning. Any modification of the structure, change of the ratio relationship, or adjustment of the size, without affecting the effects that this application can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in this application.

[0024] As shown Figure 1 in the figure, an embodiment of the present invention provides a boom, which includes a basic boom 1, a telescopic boom 2 that can telescope relative to the basic boom 1, and a boom telescopic length detection device.

[0025] The boom telescopic length detection device includes a wire rope sensor 4. The wire rope sensor 4 is fixed on the basic boom 1, and the wire rope in the wire rope sensor 4 bypasses at least one wire passing pulley and is fixed on the telescopic boom 2. In this embodiment, the wire rope sensor 4 is fixed on the upper surface of the basic boom 1 through a mounting base 3 (certainly, it can also be fixed at other positions), and is located in the boom hinge point cavity 16, so that it will not be damaged by collision when loading goods. The end of the wire rope 5 is fixed on the telescopic boom 2 through a fixing screw 10 (certainly, other fixing methods can also be adopted).

[0026] In this embodiment, the boom telescopic length detection device includes two wire passing pulleys (a first wire passing pulley 6 and a second wire passing pulley 9). The boom telescopic length detection device further includes a wire passing pulley mounting plate 7, and the wire passing pulley mounting plate 7 is fixed on the basic boom 1. The first wire passing pulley 6 and the second wire passing pulley 9 are respectively rotatably mounted on the wire passing pulley mounting plate 7 through a first pin shaft 15 and a second pin shaft 14, and the wire rope 5 winds from the upper surface of the first wire passing pulley 6 to the lower surface of the second wire passing pulley 9 and then is fixed on the telescopic boom 2.

[0027] In this embodiment, the boom telescopic length detection device further includes a rotating shaft 8 and an elastic member. The rotating shaft 8 is fixed on the basic boom 1, and the wire passing pulley mounting plate 7 is pivotally connected to the rotating shaft 8, so that the wire passing pulley mounting plate 7 can rotate around the rotating shaft 8. In this embodiment, the elastic member is a spring 12 (other structures of elastic members can also be adopted), and is fixed on the basic boom 1 through a spring fixing member 11. The two ends of the spring 12 are respectively connected to the wire passing pulley mounting plate 7 and the basic boom 1. When the telescopic boom 2 extends forward relative to the basic boom 1 and pulls out the wire rope 5, driving the wire passing pulley mounting plate 7 to rotate, the spring 12 is stretched, generating a pulling force on the wire passing pulley mounting plate 7, and further providing a pre-tightening force for the wire rope 5. When the telescopic boom 2 retracts, the wire rope 5 will retract synchronously. At this time, because the spring 12 will continuously apply a pulling force to the wire passing pulley mounting plate 7, and then provide a continuous pre-tightening force for the wire rope 5 through the first wire passing pulley 6 and the second wire passing pulley 9, even if the boom shakes and causes the wire rope 5 to shake, the wire rope 5 will still be straightened, effectively preventing the risk of skipping caused by the boom shaking.

[0028] In this embodiment, the boom telescopic length detection device further includes a contact sensor 14. The contact sensor 14 is fixed on the basic boom 1 and has a preset detection distance from the wire passing pulley mounting plate 7, so that when the length sensor fails and the wire rope 5 cannot retract in time, the spring 12 pulls the wire passing pulley mounting plate 7 to rotate until it touches the contact sensor 14 and triggers an alarm, reminding the operator that there is a safety hazard in the boom telescoping and urgent shutdown inspection is required.

[0029] This embodiment also provides a forklift truck, including the boom as described above.

[0030] Compared with the prior art, this embodiment has the following advantages: 1. By arranging the wire rope to bypass the wire wheel, the wire rope sensor can be installed at any position of the basic boom. Compared with the traditional linear arrangement method, it has the characteristic of strong installation adaptability. 2. Under the continuous tensile force of the spring, the wire rope is under the continuous pre-tightening force of the first wire wheel and the second wire wheel, which can effectively prevent the risk of the boom shaking and skipping the rope. 3. By setting the contact sensor, when the wire rope fails, the contact sensor can be triggered to alarm, which can effectively prevent the failure of the wire rope sensor and the risk of the whole vehicle instability and collapse caused by the over-extension of the boom.

[0031] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An arm telescopic length detection device for being installed on an arm to detect the telescopic length of the arm. The arm includes a basic arm and a telescopic arm capable of telescoping relative to the basic arm, and is characterized in that, The boom telescopic length detection device includes a wire rope sensor, which is fixed to the basic boom, and the wire rope in the wire rope sensor bypasses at least one wire guiding pulley and is fixed to the telescopic boom.

2. The boom telescopic length detection device according to claim 1, characterized in that, It further includes a wire guiding pulley mounting plate, which is fixed to the basic boom. The boom telescopic length detection device includes a first wire guiding pulley and a second wire guiding pulley. The first wire guiding pulley and the second wire guiding pulley are rotatably mounted on the wire guiding pulley mounting plate, and the wire rope winds from the upper surface of the first wire guiding pulley to the lower surface of the second wire guiding pulley and then is fixed to the telescopic boom.

3. The boom telescopic length detection device according to claim 2, characterized in that, It further includes a rotating shaft and an elastic member. The rotating shaft is fixed to the basic boom, the wire guiding pulley mounting plate is pivotally connected to the rotating shaft, and two ends of the elastic member are respectively connected to the wire guiding pulley mounting plate and the basic boom. When the telescopic boom extends forward relative to the basic boom and pulls out the wire rope, driving the wire guiding pulley mounting plate to rotate, the elastic member is stretched and generates a pulling force on the wire guiding pulley mounting plate, thereby providing a pre-tightening force for the wire rope.

4. The boom telescopic length detection device according to claim 3, characterized in that, It further includes a contact sensor, which is fixed to the basic boom and has a preset detection distance from the wire guiding pulley mounting plate, so that when a fault occurs in the length sensor and the wire rope cannot be retracted in time, the elastic member pulls the wire guiding pulley mounting plate to rotate until it contacts the contact sensor and triggers an alarm.

5. The boom telescopic length detection device according to claim 3, characterized in that, The elastic member is a spring and is fixed to the basic boom through a spring fixing member.

6. The boom telescopic length detection device according to claim 1, wherein, The wire rope sensor is fixed to the upper surface of the basic boom through a mounting seat.

7. The boom telescopic length detection device according to claim 6, characterized in that, The wire rope sensor is located in the boom hinge point cavity.

8. The boom telescopic length detection device according to claim 1, characterized in that, The wire rope is fixed to the telescopic boom through a fixing screw.

9. A boom, characterized in that, It includes a basic boom, a telescopic boom, and the boom telescopic length detection device according to any one of claims 1 to 8.

10. A forklift truck, characterized in that, It includes the boom according to claim 9.

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