Boom telescopic length detection device, boom and forklift loader

Abstract

The utility model 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] This application relates to the field of mechanical equipment technology, and in particular to a boom extension length detection device and a boom and forklift. Background Technology

[0002] As a heavy-duty transportation tool, safety is of paramount importance for forklifts, especially the control of the extension length when extending under different loads, which affects the stability of the entire vehicle.

[0003] Currently, the cable sensors on forklifts on the market are located on the outer side of the boom and operate in a straight line. This device has the following safety hazards: First, there is the problem of breakage due to collision: the cable sensor is located on the outer side of the boom and is easily damaged by collisions when loading goods; second, there is the problem of failure in single-sided cable breakage detection: when the boom is rapidly extending or retracting, the cable sensor may jump due to boom vibration, preventing the cable from retracting smoothly, resulting in inaccurate detection results and damage to the cable sensor. Utility Model Content

[0004] To solve the above-mentioned technical problems, the purpose of this utility model is to provide a boom extension length detection device, boom, and forklift that can improve the reliability of detection.

[0005] The technical solution provided by this utility model is as follows:

[0006] A boom telescopic length detection device is used to detect the boom telescopic length when installed on a boom, the boom including a base boom and a telescopic boom that can telescopic relative to the base boom, the boom telescopic length detection device including a pull wire sensor, the pull wire sensor being fixed to the base boom, and the pull wire in the pull wire sensor passing through at least one pulley and being fixed to the telescopic boom.

[0007] Preferably, it also includes a wire guide wheel mounting plate, which is fixed to the basic arm. The arm telescopic length detection device includes a first wire guide wheel and a second wire guide wheel. Both the first wire guide wheel and the second wire guide wheel are rotatably mounted on the wire guide wheel mounting plate. The pull wire goes from the upper surface of the first wire guide wheel to the lower surface of the second wire guide wheel and is then fixed to the telescopic arm.

[0008] Preferably, it also includes a rotating shaft and an elastic element. The rotating shaft is fixed to the base arm, and the guide wheel mounting plate is pivotally connected to the rotating shaft. The two ends of the elastic element are respectively connected to the guide wheel mounting plate and the base arm. When the telescopic arm extends forward relative to the base arm to pull out the pull line and drive the guide wheel mounting plate to rotate, the elastic element is stretched, generating a pulling force on the guide wheel mounting plate, thereby providing a preload force to the pull line.

[0009] Preferably, it also includes a contact sensor, which is fixed on the basic arm and has a preset detection distance with the guide wheel mounting plate. When the length sensor fails and the pull wire cannot retract in time, the elastic element pulls the guide wheel mounting plate to rotate to contact the contact sensor and trigger an alarm.

[0010] Preferably, the elastic element is a spring, which is fixed to the basic arm by a spring fixing element.

[0011] Preferably, the pull wire sensor is located in the boom hinge cavity.

[0012] Preferably, the pull-wire sensor is fixed to the upper surface of the base arm via a mounting bracket.

[0013] Preferably, the pull cable is fixed to the telescopic arm by fixing screws.

[0014] A boom includes a base boom, a telescopic boom, and a boom telescopic length detection device as described above.

[0015] A forklift truck, including the boom as described above.

[0016] Compared to existing technologies, this utility model's boom extension length detection device, boom, and forklift utilize a pull cable in a pull cable sensor. The pull cable passes from the pull cable sensor fixed to the base boom, around at least one guide wheel, and is then fixed to the telescopic boom. The rotation of the guide wheel allows the pull cable sensor to be installed at any position on the base boom, offering strong installation adaptability and preventing damage from collisions, thereby improving the lifespan and reliability of the detection device. Furthermore, by incorporating a first guide wheel, a second guide wheel, a guide wheel mounting plate, a rotating shaft, and elastic elements, when the telescopic boom extends forward relative to the base boom, the pull cable is pulled out. As the guide wheel mounting plate rotates, the elastic element is stretched, generating tension on the guide wheel mounting plate and providing preload to the pull cable. This effectively prevents the risk of rope skipping due to boom vibration, further enhancing detection reliability. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the boom structure of an embodiment of the present utility model.

[0019] In the diagram, 1. Basic arm; 2. Telescopic arm; 3. Mounting base; 4. Pull wire sensor; 5. Pull wire; 6. First guide roller; 7. Guide roller mounting plate; 8. Rotating shaft; 9. Second guide roller; 10. Fixing screw; 11. Spring fixing component; 12. Spring; 13. Contact sensor; 14. Second pin; 15. First pin; 16. Arm hinge cavity. Detailed Implementation

[0020] 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, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly set on the other component; when a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to the other component.

[0022] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "a plurality of" or "several" means two or more, unless otherwise explicitly specified.

[0024] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.

[0025] like Figure 1 As shown, this utility model embodiment provides a boom, including a basic boom 1, a telescopic boom 2 that can extend and retract relative to the basic boom 1, and a boom extension length detection device.

[0026] The boom extension length detection device includes a pull-wire sensor 4, which is fixed to the base boom 1. The pull wire in the pull-wire sensor 4 passes through at least one wire guide wheel and is fixed to the telescopic boom 2. In this embodiment, the pull-wire sensor 4 is fixed to the upper surface of the base boom 1 by a mounting base 3 (it can also be fixed in other positions), and is located in the boom hinge cavity 16, so that it will not be damaged by collision when loading goods. The end of the pull wire 5 is fixed to the telescopic boom 2 by a fixing screw 10 (other fixing methods can also be used).

[0027] In this embodiment, the boom telescopic length detection device includes two wire guide wheels (a first wire guide wheel 6 and a second wire guide wheel 9). The device also includes a wire guide wheel mounting plate 7, which is fixed to the base boom 1. The first wire guide wheel 6 and the second wire guide wheel 9 are rotatably mounted on the wire guide wheel mounting plate 7 via a first pin 15 and a second pin 14, respectively. The pull wire 5 winds from the upper surface of the first wire guide wheel 6 to the lower surface of the second wire guide wheel 9 and is then fixed to the telescopic boom 2.

[0028] In this embodiment, the boom extension length detection device further includes a rotating shaft 8 and an elastic element. The rotating shaft 8 is fixed to the base boom 1, and the wire guide wheel mounting plate 7 is pivotally connected to the rotating shaft 8, allowing the wire guide wheel mounting plate 7 to rotate around the rotating shaft 8. In this embodiment, the elastic element is a spring 12 (other elastic elements can also be used), which is fixed to the base boom 1 by a spring fixing member 11. The two ends of the spring 12 are respectively connected to the wire guide wheel mounting plate 7 and the base boom 1. When the telescopic boom 2 extends forward relative to the base boom 1, it pulls out the pull wire 5, causing the wire guide wheel mounting plate 7 to rotate. The spring 12 is stretched, generating a pulling force on the wire guide wheel mounting plate 7, thereby providing a preload force to the pull wire 5. When the telescopic arm 2 retracts, the cable 5 will retract synchronously. At this time, because the spring 12 will continuously exert tension on the cable guide plate 7, and then provide continuous pre-tension force to the cable 5 through the first cable guide 6 and the second cable guide 9, even if the cable 5 shakes due to arm vibration, it will still be straightened. This effectively prevents the risk of rope skipping caused by arm vibration.

[0029] In this embodiment, the boom extension length detection device also includes a contact sensor 14. The contact sensor 14 is fixed on the basic boom 1 and has a preset detection distance between it and the guide wheel mounting plate 7. When the length sensor malfunctions and the pull line 5 cannot retract in time, the spring 12 pulls the guide wheel mounting plate 7 to rotate until it contacts the contact sensor 14 and triggers an alarm, reminding the operator that there is a safety hazard in the boom extension and that the machine needs to be stopped immediately for inspection.

[0030] This embodiment also provides a forklift truck, including the boom described above.

[0031] Compared with the prior art, this embodiment has the following advantages:

[0032] 1. By arranging the cable around the reel, the cable sensor can be installed at any position on the basic boom, which is more adaptable to installation compared to the traditional straight-line arrangement.

[0033] 2. By using the pull rope under the continuous tension of the spring and the continuous pre-tension of the first and second guide pulleys, the risk of the rope shaking during jump rope can be effectively prevented.

[0034] 3. By setting up a contact sensor, an alarm can be triggered when the cable fails, which can effectively prevent the risk of the whole vehicle becoming unstable and collapsing due to cable sensor failure and boom overextension.

[0035] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A boom telescopic length detection device, used for mounting on a boom to detect the boom telescopic length, the boom comprising a base boom and a telescopic boom capable of telescopic extension and retraction relative to the base boom, characterized in that, The boom telescopic length detection device includes a pull-wire sensor, which is fixed to the base boom, and the pull-wire in the pull-wire sensor passes through at least one pulley and is fixed to the telescopic boom.

2. The boom telescopic length detection device as described in claim 1, characterized in that, It also includes a wire guide wheel mounting plate, which is fixed to the basic boom. The boom telescopic length detection device includes a first wire guide wheel and a second wire guide wheel. Both the first and second wire guide wheels are rotatably mounted on the wire guide wheel mounting plate. The pull wire goes from the upper surface of the first wire guide wheel to the lower surface of the second wire guide wheel and is then fixed to the telescopic boom.

3. The boom telescopic length detection device as described in claim 2, characterized in that, It also includes a rotating shaft and an elastic element. The rotating shaft is fixed to the base arm, and the wire guide wheel mounting plate is pivotally connected to the rotating shaft. The two ends of the elastic element are respectively connected to the wire guide wheel mounting plate and the base arm. When the telescopic arm extends forward relative to the base arm, it pulls out the wire and drives the wire guide wheel mounting plate to rotate. The elastic element is stretched, generating a pulling force on the wire guide wheel mounting plate, thereby providing a preload force to the wire.

4. The boom telescopic length detection device as described in claim 3, characterized in that, It also includes a contact sensor, which is fixed on the base arm and has a preset detection distance between itself and the guide wheel mounting plate. When the length sensor malfunctions and the pull wire cannot retract in time, the elastic element pulls the guide wheel mounting plate to rotate to contact the contact sensor and trigger an alarm.

5. The boom telescopic length detection device as described in claim 3, characterized in that, The elastic element is a spring, which is fixed to the basic arm by a spring fixing element.

6. The boom telescopic length detection device as described in claim 1, characterized in that, The pull-wire sensor is fixed to the upper surface of the base arm via a mounting bracket.

7. The boom telescopic length detection device as described in claim 6, characterized in that, The pull-wire sensor is located in the boom hinge cavity.

8. The boom telescopic length detection device as described in claim 1, characterized in that, The pull cable is fixed to the telescopic arm by fixing screws.

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

10. A forklift, characterized in that, Includes the boom as described in claim 9.

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