Telescopic arm drag chain device, aerial work platform and aerial work platform control method

Abstract

The invention discloses a telescopic arm drag chain device, an aerial work platform and an aerial work platform control method, and the telescopic arm drag chain device comprises a drag chain with one end used for being connected with a fixed arm frame of a telescopic arm; the drag chain guide pipe is connected with the other end of the drag chain and used for being connected with a movable arm of the telescopic arm, and the drag chain guide pipe is provided with a rack; the mounting seat is used for being connected with a fixed arm frame; the gear is rotatably arranged on the mounting seat and is meshed with the rack; and the angle detection piece is arranged on the mounting seat and is used for detecting the rotation angle displacement of the gear. The drag chain guide pipe and the drag chain can move along with the movable arm, the rack moves along with the drag chain guide pipe, the gear is driven to rotate through meshing transmission of the rack and the gear, the angular displacement of the gear can be detected through the angle detection piece in the gear rotating process, and then the angle of the gear can be detected according to the angular displacement of the gear and the structural size of the gear. And the displacement of the rack, namely the telescopic displacement of the movable arm, can be obtained through calculation, so that the extension position of the telescopic arm can be determined according to the displacement of the telescopic arm.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering machinery, and more specifically, to a telescopic arm drag chain device. Furthermore, the present invention also relates to an aerial work platform including the telescopic arm drag chain device and an aerial work platform control method using the same. Background Art

[0002] In the process of engineering construction, aerial work platforms are widely used.

[0003] The aerial work platform includes a telescopic arm. The extension length of the telescopic arm has an important impact on the allowable load range of the entire machine, as well as the extension speed of the telescopic arm, which has an important impact on the safe construction of the aerial work platform. Therefore, real-time monitoring of the extension length of the telescopic arm is of great significance.

[0004] However, in the related art, due to the limitation of the internal space of the telescopic arm, it is impossible to install a length sensor.

[0005] Therefore, how to conveniently obtain the extension length of the telescopic arm of the aerial work platform is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] In view of this, an object of the present invention is to provide a telescopic arm drag chain device, which can easily obtain the extended length of the telescopic arm of the aerial work platform.

[0007] Another object of the present invention is to provide an aerial work platform including the telescopic arm drag chain device, which facilitates obtaining the extended length of the telescopic arm of the aerial work platform;

[0008] Another object of the present invention is to provide an aerial work platform control method applied to the above-mentioned aerial work platform, which can determine the allowable working load range corresponding to the extended length of the telescopic arm of the aerial work platform according to the extended length of the telescopic arm.

[0009] Another object of the present invention is to provide an aerial work platform control method applied to the above-mentioned aerial work platform, which can determine the telescopic arm's extension speed according to the extension length of the telescopic arm of the aerial work platform to ensure that the telescopic arm's extension speed is within a safe range.

[0010] In order to achieve the above object, the present invention provides the following technical solutions:

[0011] A telescopic arm drag chain device, comprising:

[0012] Drag chain, one end of which is used to connect to the fixed arm of the telescopic arm;

[0013] a drag chain conduit connected to the other end of the drag chain and used to be connected to the movable arm of the telescopic arm, and the drag chain conduit is provided with a rack;

[0014] A mounting base, used for connecting to the fixed arm;

[0015] a gear rotatably mounted on the mounting seat and meshing with the rack;

[0016] An angle detection component is provided on the mounting seat and is used to detect the angular displacement of the gear.

[0017] Optionally, it also includes:

[0018] An elastic component is provided on the mounting seat and is used for applying elastic force to the gear so as to keep the gear in meshing state with the rack.

[0019] Optionally, the angle detection member includes a rotating shaft and an angle sensor connected to the rotating shaft, the gear is connected to the rotating shaft, the rotating shaft is rotatably provided on the floating member, the floating member is slidably provided on the mounting seat, the sliding direction of the floating member is the same as the extension and contraction direction of the elastic member, and the elastic member is provided between the floating member and the mounting seat.

[0020] Optionally, it also includes:

[0021] The roller is rotatably arranged on the mounting seat and abuts against the bottom of the drag chain guide tube.

[0022] Optionally, it also includes:

[0023] The lateral limiting device is provided on the mounting seat and is located on both sides of the drag chain conduit, and is used to limit the two sides of the drag chain conduit.

[0024] Optionally, the lateral limiting device includes a spherical hinge bearing or a ball, and the spherical hinge bearing or the ball is used to contact the side of the drag chain guide.

[0025] An aerial work platform, comprising:

[0026] A telescopic arm, comprising a fixed arm frame and a movable arm slidably connected to the fixed arm frame;

[0027] Any of the above-mentioned telescopic arm drag chain devices, one end of the drag chain of the telescopic arm drag chain device is connected to the fixed arm frame, the drag chain guide of the telescopic arm drag chain device is connected to the movable arm, and the mounting base of the telescopic arm drag chain device is connected to the fixed arm frame.

[0028] A method for controlling an aerial work platform, applied to the above-mentioned aerial work platform, comprising:

[0029] Utilizing an angle detection member of the telescopic arm drag chain device of the aerial work platform to detect the angular displacement of a gear of the telescopic arm drag chain device;

[0030] Calculating a current position of a movable arm of the telescopic arm of the aerial work platform according to the angular displacement;

[0031] An allowable working load range corresponding to the aerial work platform is determined according to the current position.

[0032] Optionally, calculating the current position of the boom of the telescopic arm of the aerial work platform according to the angular displacement includes:

[0033] Every first preset time, the displacement of the movable arm within the first preset time is calculated based on the rotational angle displacement of the gear within the first preset time, and the displacement of the movable arm within the i-th first preset time is recorded as k i x i , k i =1 is the extension displacement, k i =-1 is the retraction displacement, i is a positive integer;

[0034] According to the cumulative displacement of the movable arm during the (i-1)th first preset time and the displacement of the movable arm during the i-th first preset time, the current total displacement x of the movable arm is calculated, x=∑k i x i ;

[0035] The current position of the movable arm is determined according to the total displacement at every first preset time.

[0036] A method for controlling an aerial work platform, applied to the above-mentioned aerial work platform, comprising:

[0037] At every second preset time, using an angle detection member of the telescopic arm drag chain device of the aerial work platform to detect the angular displacement of the gear of the telescopic arm drag chain device within the second preset time;

[0038] Calculating the telescopic speed of the telescopic arm of the aerial work platform within the second preset time based on the angular displacement of the gear within the second preset time;

[0039] Determining whether the telescopic speed exceeds a preset speed value;

[0040] If so, the power device of the movable arm is controlled to decelerate the movable arm until the extension and retraction speed meets the preset speed value.

[0041] The telescopic arm drag chain device provided by the present invention has the following beneficial effects:

[0042] The telescopic arm drag chain device is used to be installed on the telescopic arm of the aerial work platform, that is, one end of the drag chain is connected to the fixed arm frame of the telescopic arm, the drag chain guide is connected to the movable arm of the telescopic arm, and the gear and angle detection component are installed on the fixed arm frame of the telescopic arm through the mounting base.

[0043] The movable arm of the telescopic arm can be extended and retracted relative to the fixed arm frame. When the movable arm is extended and retracted, the movable arm drives the drag chain duct and the drag chain to move together, and then the rack moves along with the drag chain duct, and the gear is driven to rotate through the meshing transmission of the rack and the gear. During the rotation of the gear, the angular displacement of the gear can be detected by the angle detection part, and then the displacement of the rack can be calculated according to the angular displacement of the gear and the structural dimensions of the gear itself, that is, the displacement of the drag chain duct and the drag chain, that is, the telescopic displacement of the movable arm of the telescopic arm, so that the current position of the telescopic arm can be determined according to the displacement of the telescopic arm, and then it is convenient to determine the allowable load range of the whole machine that is consistent with the extended position of the telescopic arm according to the current position of the telescopic arm, and it is also convenient to calculate the extension speed of the telescopic arm according to the telescopic displacement of the telescopic arm, so as to ensure that the extension speed of the telescopic arm is within a safe range.

[0044] Moreover, by arranging a rack in the drag chain duct, utilizing the meshing transmission of the gear and the rack, and detecting the angular displacement of the gear through the angle detection part, the angular displacement is converted into the displacement of the rack, that is, the displacement of the drag chain duct, the drag chain and the telescopic arm boom. This structure is simple and does not require occupying the internal space of the telescopic arm, and can realize the measurement of the extended length of the telescopic arm.

[0045] It should be emphasized that the present invention proposes to add a gear and a rack between the drag chain guide tube and the fixed arm of the telescopic arm, and utilize the telescopic movement of the telescopic arm's movable arm relative to the fixed arm of the telescopic arm to drive the rack and the gear to transmit synchronously, thereby realizing the linkage between the gear and the telescopic arm, and then indirectly determining the displacement of the telescopic arm's movable arm by detecting the angular displacement of the gear. This inventive concept realizes real-time and accurate monitoring of the telescopic length of the telescopic arm movable arm, makes up for the defect in the related art that the telescopic length of the movable arm cannot be monitored, and solves the technical problem in the related art that the extended length of the telescopic arm of the aerial work platform is difficult to obtain. Moreover, the present invention provides a specific setting scheme for the gear and the rack, that is, the rack is arranged on the drag chain duct. Since the drag chain duct is connected to the movable arm of the telescopic arm, the drag chain duct can move with the movable arm, and then drive the rack and the movable arm to move synchronously through the drag chain duct; the gear and the angle detection component are arranged on the fixed arm frame of the telescopic arm through the mounting seat, avoiding the direct addition of detection-related structures between the movable arm and the fixed arm frame, meeting the installation of the movable arm displacement monitoring-related structure when the space between the movable arm and the fixed arm frame is limited, and avoiding affecting the movement of the movable arm.

[0046] The aerial work platform provided by the present invention includes any one of the above-mentioned telescopic arm drag chain devices, and at least includes the beneficial effects of the above-mentioned telescopic arm drag chain device.

[0047] One of the aerial work platform control methods provided by the present invention is applied to the above-mentioned aerial work platform, includes the beneficial effects of the above-mentioned telescopic arm drag chain device, and can determine the allowable working load range corresponding to the extension length of the telescopic arm according to the extension length of the telescopic arm.

[0048] Another aerial work platform control method provided by the present invention is applied to the above-mentioned aerial work platform, includes the beneficial effects of the above-mentioned telescopic arm drag chain device, and can determine the telescopic speed of the telescopic arm according to the extended length of the telescopic arm of the aerial work platform to ensure that the telescopic speed of the telescopic arm is within a safe range. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0050] Figure 1 A schematic cross-sectional view of a telescopic arm drag chain device provided in a specific embodiment of the present invention;

[0051] Figure 2 This is an exploded view of the telescopic arm drag chain device (drag chain and drag chain guide are not shown);

[0052] Figure 3 This is a schematic diagram of the structure of the drag chain guide;

[0053] Figure 4 It is a structural schematic diagram of the telescopic arm drag chain device;

[0054] Figure 5 A schematic structural diagram of an aerial work platform provided in a specific embodiment of the present invention;

[0055] Figure 6 A flowchart of a method for controlling an aerial work platform provided by a specific embodiment of the present invention;

[0056] Figure 7 This is a flow chart of another aerial work platform control method provided by a specific embodiment of the present invention.

[0057] Reference numerals:

[0058] 1-Drag chain; 2-Drag chain guide; 3-Rack; 4-Mounting seat; 5-Gear; 6-Angle detection element; 7-Elastic member; 8-Floating element; 9-Roller; 10-Lateral limit device; 101-Spherical hinge bearing; 11-Sliding bearing; 12-Support shaft; 13-Fixer; 14-Adapter; 15-Mounting bracket;

[0059] 100-Telescopic arm drag chain device. DETAILED DESCRIPTION

[0060] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0061] The core of the present invention is to provide a telescopic arm drag chain device that can easily obtain the extended length of the telescopic arm of the aerial work platform. Another core of the present invention is to provide an aerial work platform including the above-mentioned telescopic arm drag chain device, which can easily obtain the extended length of the telescopic arm of the aerial work platform; another core of the present invention is to provide an aerial work platform control method applied to the above-mentioned aerial work platform, which can determine the allowable working load range corresponding to the extended length of the telescopic arm according to the extended length of the telescopic arm of the aerial work platform. Another core of the present invention is to provide an aerial work platform control method applied to the above-mentioned aerial work platform, which can determine the telescopic speed of the telescopic arm according to the extended length of the telescopic arm of the aerial work platform to ensure that the telescopic speed of the telescopic arm is within a safe range.

[0062] Please refer to Figure 1 、 Figure 2 and Figure 3 and Figure 4 An embodiment of the present invention provides a telescopic arm drag chain device, including a drag chain 1, a drag chain guide 2, a mounting seat 4, a gear 5 and an angle detection member 6. One end of the drag chain 1 is used to connect with the fixed arm frame of the telescopic arm; the other end of the drag chain 1 is connected to the drag chain guide 2, the drag chain guide 2 is used to connect with the movable arm of the telescopic arm, and the drag chain guide 2 is provided with a rack 3; the mounting seat 4 is used to connect with the fixed arm frame of the telescopic arm, and the mounting seat 4 plays the role of installing and supporting the gear 5 and the angle detection member 6. The gear 5 is rotatably provided on the mounting seat 4, and the gear 5 is engaged with the rack 3; the angle detection member 6 is provided on the mounting seat 4, and the angle detection member 6 is used to detect the angular displacement of the gear 5.

[0063] It can be understood that when in use, the telescopic arm drag chain device is installed on the telescopic arm of the aerial work platform, that is, one end of the drag chain 1 is connected to the fixed arm frame of the telescopic arm, the drag chain guide 2 is connected to the movable arm of the telescopic arm, and the gear 5 and the angle detection part 6 are installed on the fixed arm frame of the telescopic arm through the mounting base 4.

[0064] The movable arm of the telescopic arm can be extended and retracted relative to the fixed arm frame. When the movable arm is extended and retracted, the movable arm drives the drag chain guide 2 and the drag chain 1 to move together, and then the rack 3 moves with the drag chain guide 2, and the gear 5 is driven to rotate through the meshing transmission of the rack 3 and the gear 5. During the rotation of the gear 5, the angle detection part 6 can be used to detect the angular displacement of the gear 5, and then the displacement of the rack 3 can be calculated according to the angular displacement of the gear 5 and the structural dimensions of the gear 5 itself, that is, the displacement of the drag chain guide 2 and the drag chain 1, that is, the telescopic displacement of the movable arm of the telescopic arm, so that the current position of the telescopic arm can be determined according to the displacement of the telescopic arm, and then it is convenient to determine the allowable load range of the whole machine that is consistent with the extended position of the telescopic arm according to the current position of the telescopic arm, and it is also convenient to calculate the extension speed of the telescopic arm according to the telescopic displacement of the telescopic arm to ensure that the extension speed of the telescopic arm is within a safe range.

[0065] Moreover, this embodiment sets a rack 3 in the drag chain duct 2, utilizes the meshing transmission of the gear 5 and the rack 3, detects the angular displacement of the gear 5 through the angle detection part 6, and converts the angular displacement into the displacement of the rack 3, that is, the displacement of the drag chain duct 2, the drag chain 1 and the telescopic arm boom. The structure is simple and does not need to occupy the internal space of the telescopic arm, and can realize the measurement of the extended length of the telescopic arm.

[0066] It should be emphasized that the embodiment of the present invention proposes to add a gear 5 and a rack 3 between the drag chain guide 2 and the fixed arm of the telescopic arm, and utilize the telescopic movement of the movable arm of the telescopic arm relative to the fixed arm of the telescopic arm to drive the rack 3 and the gear 5 to transmit synchronously, thereby realizing the linkage between the gear 5 and the telescopic arm, and then indirectly determining the displacement of the movable arm of the telescopic arm by detecting the angular displacement of the gear 5. This inventive concept realizes real-time and accurate monitoring of the telescopic length of the movable arm of the telescopic arm, makes up for the defect in the related art that the telescopic length of the movable arm cannot be monitored, and solves the technical problem in the related art that the extended length of the telescopic arm of the aerial work platform is difficult to obtain. Moreover, this embodiment provides a specific setting scheme for the gear 5 and the rack 3, that is, the rack 3 is arranged on the drag chain duct 2. Since the drag chain duct 2 is connected to the movable arm of the telescopic arm, the drag chain duct 2 can move with the movable arm, and then drive the rack 3 and the movable arm to move synchronously through the drag chain duct 2; the gear 5 and the angle detection part 6 are arranged on the fixed arm frame of the telescopic arm through the mounting seat 4, avoiding the direct addition of detection-related structures between the movable arm and the fixed arm frame, meeting the installation of the movable arm displacement monitoring-related structure when the space between the movable arm and the fixed arm frame is limited, and avoiding affecting the movement of the movable arm.

[0067] Furthermore, if Figure 1 and Figure 2 As shown, in some embodiments, the telescopic arm drag chain device further includes an elastic member 7 , which is disposed on the mounting seat 4 , and is used to apply elastic force to the gear 5 to keep the gear 5 in meshing state with the rack 3 .

[0068] That is to say, in this embodiment, the gear 5 is floated by providing the elastic member 7, so that under the action of the elastic member 7, the gear 5 always has the elastic force to engage with the rack 3, thereby ensuring that the gear 5 can always be engaged with the rack 3, thereby ensuring the reliability and accuracy of the meshing transmission between the gear 5 and the rack 3, which is conducive to ensuring the accuracy of the detection results.

[0069] It should be noted that this embodiment does not limit the specific structure and specific arrangement of the elastic member 7, as long as the elastic member 7 can provide elastic force to the gear 5 so that the gear 5 maintains the meshing state with the rack 3.

[0070] like Figure 1 and Figure 2 As shown, in some embodiments, the angle detection member 6 includes a rotating shaft and an angle sensor connected to the rotating shaft, the gear 5 is connected to the rotating shaft, the rotating shaft is rotatably provided on the floating member 8, the floating member 8 is slidably provided on the mounting seat 4, the sliding direction of the floating member 8 is the same as the extension and contraction direction of the elastic member 7, and the elastic member 7 is provided between the floating member 8 and the mounting seat 4.

[0071] In other words, this embodiment utilizes an angle sensor to detect the rotation angle of the rotating shaft, thereby detecting the angular displacement of the gear 5. The angle sensor can be a rotary potentiometer or encoder, as long as it can detect the rotation angle of the rotating shaft. The angle sensor can be directly fixed to the rotating shaft via a coupling or flange, or it can indirectly detect the angle of the rotating shaft via a transmission mechanism. Gear 5 is connected to the rotating shaft, which supports the gear 5. Furthermore, when the gear 5 rotates, it drives the rotating shaft, thereby enabling the angle sensor to detect the rotation angle of the rotating shaft. The rotating shaft is rotatably mounted on a floating member 8, which provides rotational support for the rotating shaft and gear 5, allowing the gear 5 and the rotating shaft to rotate relative to the floating member 8. Furthermore, because the floating member 8 is slidably mounted on the mounting base 4, the sliding movement of the floating member 8 relative to the mounting base 4 allows the rotating shaft and gear 5 to float as a whole. Therefore, the elastic force of the elastic member 7 applied to the floating member 8 ensures that the gear 5 is always engaged with the rack 3, preventing gaps or stuck points between the gear 5 and the rack 3.

[0072] It should be noted that this embodiment does not limit the specific structure of the floating member 8 , as long as the floating member 8 can rotate and support the rotating shaft and can slide relative to the mounting seat 4 .

[0073] For example, Figure 2 As shown, the floating member 8 includes a first U-shaped support arm and a sliding portion. The first U-shaped support arm includes two first support plates arranged in parallel and a first base plate connected between the two first support plates. The rotating shaft is rotatably passed through the two first support plates. The gear 5 is installed on the rotating shaft and is located between the two first support plates. The sliding portion is connected to the first base plate. The sliding portion is slidably passed through the mounting seat 4. The elastic member 7 can be a spring. The spring is sleeved on the sliding portion and is located between the mounting seat 4 and the first base plate.

[0074] like Figure 1 and Figure 2 As shown, in order to ensure the reliability of the sliding of the floating member 8 relative to the mounting seat 4, in some embodiments, a sliding bearing 11 is provided between the floating member 8 and the mounting seat 4.

[0075] That is to say, this embodiment sets a sliding bearing 11 between the floating part 8 and the mounting seat 4, and uses the sliding bearing 11 to ensure the smoothness of the sliding of the floating part 8 relative to the mounting seat 4 and the correctness of the sliding direction. At the same time, it can reduce the friction between the floating part 8 and the mounting seat 4, reduce the wear of the floating part 8, ensure the accuracy of the position of the floating part 8, thereby improving the meshing accuracy of the gear 5 and the rack 3, and ensuring the reliability of the entire device.

[0076] It should be noted that this embodiment does not limit the specific structure and type of the sliding bearing 11 .

[0077] In addition, since the telescopic arm drag chain device is usually a cantilever beam structure, when the drag chain conduit 2 is extended longer with the movable arm of the telescopic arm, the drag chain 1 tends to bend downward due to gravity, which can easily cause the drag chain conduit 2 to bend and break. In order to solve this technical problem, Figure 1 and Figure 2 As shown, in some embodiments, the telescopic arm drag chain device further includes a roller 9 , which is rotatably disposed on the mounting seat 4 , and the roller 9 abuts against the bottom of the drag chain conduit 2 .

[0078] In other words, this embodiment provides rotatable rollers 9 at the bottom of the drag chain conduit 2. These rollers 9 provide support and position control for the bottom of the drag chain conduit 2, preventing the drag chain 1 from bending downward under the force of gravity when extended. This prevents the drag chain conduit 2 from bending or breaking. Furthermore, as the drag chain conduit 2 moves with the boom of the telescopic arm, rolling friction is generated between the conduit 2 and the rollers 9, resulting in low friction and less wear on the conduit 2.

[0079] It should be noted that this embodiment does not limit the specific arrangement of the roller 9 , as long as the roller 9 can be rotatably arranged on the mounting seat 4 and the roller 9 is in contact with the bottom of the drag chain conduit 2 .

[0080] like Figure 1 and Figure 2 As shown, in some embodiments, the roller 9 is mounted on the mounting base 4 via a fixing member 13. For example, the fixing member 13 includes a second U-shaped support arm and a fixing portion. The second U-shaped support arm includes two second support plates arranged in parallel and a second bottom plate connected between the two second support plates. A support shaft 12 is provided between the two second support plates. The roller 9 is mounted on the support shaft 12. The roller 9 can be rotated by rotating the roller 9 relative to the support shaft 12 or by rotating the support shaft 12 relative to the two second support plates. The fixing portion is connected to the second bottom plate, and the fixing portion is fixedly connected to the mounting base 4, thereby achieving the installation of the fixing member 13 on the mounting base 4, that is, achieving the rotatable installation of the roller 9 on the mounting base 4.

[0081] In addition, in order to prevent the drag chain guide tube 2 from tilting laterally, as shown in FIG. Figure 1 and Figure 2 As shown, in some embodiments, the telescopic arm drag chain device also includes a lateral limiting device 10, which is provided on the mounting seat 4 and located on both sides of the drag chain duct 2. The lateral limiting device 10 is used to limit the two sides of the drag chain duct 2.

[0082] That is to say, this embodiment provides a lateral limit device 10 on the mounting seat 4, and uses the lateral limit device 10 to laterally limit the drag chain duct 2 to prevent the drag chain duct 2 from tilting laterally. Especially when the aerial work platform using the telescopic arm drag chain device is working on a side slope, the drag chain duct 2 can be prevented from tilting laterally, thereby ensuring the reliability of the telescopic arm drag chain device.

[0083] It should be noted that this embodiment does not limit the specific structure of the lateral limiting device 10 , as long as the lateral limiting device 10 can limit the lateral direction of the drag chain guide 2 .

[0084] like Figure 1 As shown, in some embodiments, the lateral limiting device 10 includes a spherical hinge bearing 101 or a ball, and the spherical hinge bearing 101 or the ball is used to contact the side of the drag chain guide 2.

[0085] That is to say, this embodiment provides rolling support for the side of the drag chain duct 2 through the spherical hinge bearing 101 or ball bearing, so that there is rolling friction between the drag chain duct 2 and the lateral limit device 10, and the friction force is small, which can avoid damage to the side of the drag chain duct 2.

[0086] In addition, in the above embodiments, the specific structure of the mounting seat 4 is not limited, as long as the mounting seat 4 can support the gear 5, the angle detection part 6, the elastic component 7, the roller 9 and / or the lateral limit device 10.

[0087] like Figure 2As shown, in some embodiments, the mounting base 4 includes a third U-shaped support arm and a mounting portion. The third U-shaped support arm includes two parallel third support plates and a third bottom plate connected between the two third support plates. A lateral limiter 10 is provided on the two third support plates. The floating member 8 and the fixed member 13 described above are both provided on the third bottom plate. This allows the gear 5 and the roller 9 to be located in the space between the two third support plates, and at least a portion of the drag chain conduit 2 is located between the two third support plates. The gear 5 and the roller 9 are both located at the bottom of the drag chain conduit 2. The gear 5 engages with the rack 3 at the bottom of the drag chain conduit 2, the roller 9 abuts the bottom of the drag chain conduit 2, and the side of the drag chain conduit 2 contacts the lateral limiter 10. Furthermore, the mounting portion is connected to the third U-shaped support arm, for example, connected to the outer side of the connection between one of the third support plates and the third bottom plate. The mounting portion can be a bent structure and has a mounting hole for connection to the fixed arm.

[0088] It should be noted that the above embodiment does not limit the specific connection method between the drag chain conduit 2 and the movable arm. For example, Figure 4 As shown, the end of the drag chain guide 2 away from the drag chain 1 is fixed to the mounting bracket 15 through the adapter 14, and the mounting bracket 15 is used to connect with the movable arm of the telescopic arm. The adapter 14 can be a pressure plate.

[0089] like Figure 5 As shown, in addition to the telescopic arm drag chain device 100 described above, the present invention further provides an aerial work platform including the telescopic arm drag chain device 100 disclosed in the above embodiment. The aerial work platform also includes a telescopic arm, which includes a fixed arm frame and a movable arm that can be extended and retracted relative to the fixed arm frame. One end of the drag chain 1 of the telescopic arm drag chain device 100 is connected to the fixed arm frame, the drag chain guide 2 of the telescopic arm drag chain device 100 is connected to the movable arm frame, and the mounting base 4 of the telescopic arm drag chain device 100 is connected to the fixed arm frame. The structures of the other components of the aerial work platform are referred to the prior art and will not be described in detail herein.

[0090] That is to say, the focus of this embodiment is that the aerial work platform adopts the telescopic arm drag chain device 100 disclosed in any one of the above embodiments, and applies the telescopic arm drag chain device 100 to the aerial work platform, so that the aerial work platform at least includes the beneficial effects of the above telescopic arm drag chain device 100, which will not be repeated here.

[0091] like Figure 6 As shown, in addition to the above-mentioned telescopic arm drag chain device and aerial work platform, the present invention also provides an aerial work platform control method, which is applied to the above-mentioned aerial work platform. The aerial work platform control method includes steps S11 to S13:

[0092] S11: Using the angle detection member 6 of the telescopic arm drag chain device of the aerial work platform to detect the angular displacement of the gear 5 of the telescopic arm drag chain device;

[0093] S12: Calculating the current position of the boom of the telescopic arm of the aerial work platform according to the angular displacement of gear 5;

[0094] S13: Determine the allowable working load range corresponding to the aerial work platform according to the current position of the boom.

[0095] That is to say, this embodiment uses the angle detection part 6 to detect the angular displacement of the gear 5 in real time. According to the transmission ratio between the gear 5 and the rack 3, the angular displacement of the gear 5 can be converted into the displacement of the rack 3, that is, the displacement of the boom of the telescopic arm, so that the current position of the boom can be determined. Then, according to the correspondence between the extended position of the boom and the allowable working load range allowed by the aerial work platform, the allowable working load range of the aerial work platform matching the current position of the boom can be determined, so that the boom has different allowable working load ranges at different extended positions, which is conducive to the aerial work platform having a suitable load at different extension lengths of the boom, thereby obtaining a larger working space and working range under different loads, while ensuring the working safety of the entire machine.

[0096] It can be understood that the aerial work platform can include a load detection device, which is used to detect the load applied to the aerial work platform. The angle detection member 6 cooperates with the load detection device to help improve the accuracy of the load corresponding to different extension positions of the boom.

[0097] It should be noted that this embodiment does not limit the specific method of S12: calculating the current position of the boom of the telescopic arm of the aerial work platform according to the angular displacement of the gear 5, as long as this step can be implemented.

[0098] In some embodiments, calculating the current position of the boom of the telescopic arm of the aerial work platform based on the angular displacement of the gear 5 includes:

[0099] Every first preset time, the displacement of the movable arm within the first preset time is calculated based on the angular displacement of the gear 5 within the first preset time, and the displacement of the movable arm within the i-th first preset time is recorded as k i x i , k i =1 is the extension displacement, k i =-1 is the retraction displacement, i is a positive integer;

[0100] According to the cumulative displacement of the boom within the i-1th first preset time and the displacement of the boom within the i-th first preset time, calculate the current total displacement x of the boom, x=∑k i x i ;

[0101] At every first preset time, the current position of the boom is determined according to the current total displacement of the boom.

[0102] That is to say, this embodiment records the boom movement within the first preset time as a single movement. When the angle detection part 6 detects the angular displacement of the gear 5 within the first preset time, the displacement of the single movement of the boom is calculated, and the displacement of the current single movement of the boom is summed with the previously accumulated displacement. When the boom is extended, the previously accumulated displacement is added to the displacement of the current single movement of the boom. When the boom is retracted, the previously accumulated displacement is subtracted from the displacement of the current single movement of the boom. Every first preset time, the current position of the boom is determined based on the current total displacement of the boom. That is, every first preset time, the current allowable working load range of the aerial work platform is determined once. Therefore, the allowable working load range in multiple areas of the aerial work platform can be obtained, thereby improving the accuracy and reliability of the operation.

[0103] It should be noted that the first preset time in this embodiment refers to a period of time. This embodiment does not limit the specific duration of the first preset time. For example, the first preset time may be 0.2 seconds or other durations.

[0104] In addition, if Figure 7 As shown, in addition to the above-mentioned telescopic arm drag chain device, aerial work platform, and aerial work platform control method, an embodiment of the present invention also provides another aerial work platform control method, which is applied to the above-mentioned aerial work platform. The aerial work platform control method includes steps S21 to S24:

[0105] S21: every second preset time, using the angle detection member 6 of the telescopic arm drag chain device of the aerial work platform to detect the angular displacement of the gear 5 of the telescopic arm drag chain device within the second preset time;

[0106] S22: Calculating the telescopic speed of the telescopic arm of the aerial work platform within the second preset time based on the angular displacement of the gear 5 within the second preset time;

[0107] S23: Determine whether the extension and retraction speed of the boom exceeds a preset speed value;

[0108] S24: If yes, control the power device of the boom to decelerate the boom until the extension and retraction speed meets the preset speed value.

[0109] That is to say, this embodiment uses the angle detection part 6 to detect the angular displacement of the gear 5 in real time. According to the transmission ratio between the gear 5 and the rack 3, the angular displacement of the gear 5 can be converted into the displacement of the rack 3, that is, the displacement of the boom of the telescopic arm. This embodiment calculates the extension displacement of the boom once every second preset time, and then calculates the telescopic speed of the boom within the current second preset time, so as to judge whether the telescopic speed of the boom in a single action within the second preset time is within the preset speed value, so as to judge whether the boom is overspeeding. When the telescopic action of the boom is overspeeding, the speed of the boom is controlled by controlling the power device to slow down the boom until the speed of the boom is within the preset speed value, so as to ensure the safety and reliability of the boom telescopic movement.

[0110] It should be noted that the second preset time in this embodiment refers to a period of time. This embodiment does not limit the specific length of the second preset time. The length of the second preset time can be the same as the length of the first preset time, or it can be different from the length of the first preset time. For example, the second preset time can be 0.2 seconds or other lengths. It can be understood that, every first preset time, the displacement of the boom within the first preset time is calculated based on the angular displacement of the gear 5 within the first preset time, and every second preset time, the angular displacement of the gear 5 of the telescopic arm drag chain device of the aerial work platform within the second preset time is detected by the angle detection member 6 of the telescopic arm drag chain device, and the telescopic speed of the boom of the telescopic arm of the aerial work platform within the second preset time is calculated based on the angular displacement of the gear 5 within the second preset time. These belong to two different technical solutions, both of which belong to monitoring the boom displacement and the boom telescopic speed, respectively. Considering the convenience of calculation and control, preferably, the first preset time and the second preset time are the same in length. At this time, one timing can be used to simultaneously calculate the boom displacement and the boom telescopic speed, that is, every period of time, the angular displacement of the gear 5 of the telescopic arm drag chain device of the aerial work platform within the period of time is detected by the angle detection member 6 of the telescopic arm drag chain device of the aerial work platform, and then the boom displacement and the boom telescopic speed are calculated based on the angular displacement of the gear 5 within the period of time in two directions.

[0111] In addition, this embodiment does not limit the specific structure of the power device. For example, the power device can be a pump motor. When the telescopic action of the boom exceeds the speed, the telescopic speed of the boom can be reduced by reducing the speed of the pump motor.

[0112] It should also be noted that, in this specification, relational terms such as first and second, etc. are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

[0113] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0114] The above describes in detail the telescopic arm drag chain device, aerial work platform, and aerial work platform control method provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above examples is only intended to facilitate understanding of the method and core concepts of the present invention. It should be noted that those skilled in the art may make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications also fall within the scope of protection of the present invention.

Claims

1. A telescopic arm drag chain device, characterized in that: include: A drag chain (1), one end of which is connected to the fixed arm frame of the telescopic arm; A drag chain conduit (2) is connected to the other end of the drag chain (1) and is used to connect to the movable arm of the telescopic arm, and the drag chain conduit (2) is provided with a rack (3); A mounting seat (4) for connecting to the fixed arm; A gear (5) is rotatably mounted on the mounting seat (4) and meshes with the rack (3); An angle detection member (6) is provided on the mounting seat (4) and is used to detect the angular displacement of the gear (5).

2. The telescopic arm drag chain device according to claim 1, characterized in that: Also includes: An elastic component (7) is provided on the mounting seat (4) and is used to apply an elastic force to the gear (5) so that the gear (5) remains in a meshing state with the rack (3).

3. The telescopic arm drag chain device according to claim 2, characterized in that: The angle detection member (6) includes a rotating shaft and an angle sensor connected to the rotating shaft, the gear (5) is connected to the rotating shaft, the rotating shaft is rotatably arranged on a floating member (8), the floating member (8) is slidably arranged on the mounting seat (4), the sliding direction of the floating member (8) is the same as the expansion and contraction direction of the elastic member (7), and the elastic member (7) is arranged between the floating member (8) and the mounting seat (4).

4. The telescopic arm drag chain device according to any one of claims 1 to 3, characterized in that: Also includes: The roller (9) is rotatably arranged on the mounting seat (4) and abuts against the bottom of the drag chain conduit (2).

5. The telescopic arm drag chain device according to any one of claims 1 to 3, characterized in that: Also includes: A lateral limiting device (10) is provided on the mounting seat (4) and is located on both sides of the drag chain conduit (2), and is used to limit the two sides of the drag chain conduit (2).

6. The telescopic arm drag chain device according to claim 5, characterized in that: The lateral limiting device (10) comprises a spherical hinge bearing (101) or a ball bearing, and the spherical hinge bearing (101) or the ball bearing is used to contact the side of the drag chain guide tube (2).

7. An aerial work platform, characterized in that: include: A telescopic arm, comprising a fixed arm frame and a movable arm slidably connected to the fixed arm frame; The telescopic arm drag chain device according to any one of claims 1 to 6, wherein one end of the drag chain (1) of the telescopic arm drag chain device is connected to the fixed arm frame, the drag chain guide (2) of the telescopic arm drag chain device is connected to the movable arm, and the mounting base (4) of the telescopic arm drag chain device is connected to the fixed arm frame.

8. A method for controlling an aerial work platform, characterized in that: Applied to the aerial work platform according to claim 7, the aerial work platform control method comprises: Utilizing an angle detection member (6) of the telescopic arm drag chain device of the aerial work platform to detect the angular displacement of the gear (5) of the telescopic arm drag chain device; Calculating a current position of a movable arm of the telescopic arm of the aerial work platform according to the angular displacement; An allowable working load range corresponding to the aerial work platform is determined according to the current position.

9. The aerial work platform control method according to claim 8, characterized in that: Calculating a current position of a movable arm of the telescopic arm of the aerial work platform according to the angular displacement includes: At every first preset time, the displacement of the movable arm within the first preset time is calculated based on the rotational angle displacement of the gear (5) within the first preset time, and the displacement of the movable arm within the i-th first preset time is recorded as k i x i , k i =1 is the extension displacement, k i =-1 is the retraction displacement, i is a positive integer; According to the cumulative displacement of the movable arm during the (i-1)th first preset time and the displacement of the movable arm during the i-th first preset time, the current total displacement x of the movable arm is calculated, x=∑k i x i ; The current position of the movable arm is determined according to the total displacement every first preset time.

10. A method for controlling an aerial work platform, characterized in that: Applied to the aerial work platform according to claim 7, the aerial work platform control method comprises: At every second preset time, using the angle detection member (6) of the telescopic arm drag chain device of the aerial work platform to detect the angular displacement of the gear (5) of the telescopic arm drag chain device within the second preset time; Calculating the telescopic speed of the telescopic arm of the aerial work platform within the second preset time based on the angular displacement of the gear (5) within the second preset time; Determining whether the telescopic speed exceeds a preset speed value; If so, the power device of the movable arm is controlled to decelerate the movable arm until the extension and retraction speed meets the preset speed value.

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