Speed reduction lock device for telescopic boom, control method and engineering machine

Abstract

This invention discloses a speed-reducing locking device, control method, and engineering machinery for telescopic booms. The speed-reducing locking device includes a locking shaft, a telescopic locking mechanism, and a speed-reducing stop assembly. The telescopic locking mechanism is disposed on one of the outer boom and the inner boom and is drivenly connected to the locking shaft to drive the locking shaft to move toward the other of the outer boom and the inner boom. The speed-reducing stop assembly includes at least two first stop members, which are sequentially spaced along the telescopic direction of the inner boom on the other of the outer boom and the inner boom. By abutting against the locking shaft, the inner boom is slowed down. Due to the sequential abutment between the locking shaft and the at least two first stop members, the inner boom can be prevented from sliding down. The sliding speed of the inner boom gradually decreases until it is locked onto the outer boom, thereby avoiding the phenomenon of telescopic boom breakage and ensuring the safety of telescopic boom operation.

Description

Technical Field

[0001] This invention belongs to the field of engineering machinery technology, specifically relating to a speed-reducing locking device, control method, and engineering machinery for telescopic booms. Background Technology

[0002] Telescopic booms are widely used in existing construction machinery, such as aerial fire trucks, aerial work platforms, and cranes. A telescopic boom typically consists of an outer boom and an inner boom that extends and retracts within the outer boom. The wire rope is the load-bearing component that enables the extension and retraction of the inner boom. If the wire rope has manufacturing quality issues, is poorly maintained, or has reached the end of its service life, the significant stress on the inner boom when it is raised to a certain height may cause the wire rope to suddenly break. After the wire rope breaks, the inner boom will rapidly slide down, generating a huge impact upon hitting the ground, potentially leading to a serious accident involving boom breakage. Summary of the Invention

[0003] To address the aforementioned defects or deficiencies, this invention provides a speed-reducing locking device, control method, and engineering machinery for telescopic booms, aiming to solve the technical problem of boom breakage caused by sudden wire rope breakage.

[0004] To achieve the above objectives, the present invention provides a speed-reducing locking device for telescopic booms, wherein the speed-reducing locking device for telescopic booms includes a locking shaft, a telescopic locking mechanism, and a speed-reducing stop assembly; the telescopic locking mechanism is disposed on one of the outer boom and the inner boom, and is drivenly connected to the locking shaft to drive the locking shaft to move toward the other of the outer boom and the inner boom; the speed-reducing stop assembly includes at least two first stop members, which are sequentially spaced apart along the telescopic direction of the inner boom on the other of the outer boom and the inner boom, and respectively abut against the locking shaft to reduce the speed of the inner boom.

[0005] In this embodiment of the invention, the deceleration stop assembly further includes at least two second stop members, each of which is respectively configured in correspondence with at least two first stop members, and a gap is formed between each first stop member and the corresponding second stop member for the locking shaft to pass through.

[0006] In this embodiment of the invention, the width of the gap is smaller than the diameter of the locking shaft in the free state, and the inner ends of the first stop and the second stop can undergo elastic deformation under the compression of the locking shaft, so that the locking shaft can pass through the gap.

[0007] In this embodiment of the invention, each first stop member and the corresponding second stop member are arranged in a V-shape.

[0008] In this embodiment of the invention, at least two first stop members are sequentially spaced on the inner side of the outer boom. The telescopic locking mechanism includes a drive assembly, an inner clamping cylinder, and a first elastic member. The inner clamping cylinder is disposed on the inner boom and extends axially from the inner side of the inner boom toward the outer side. The peripheral wall of the inner clamping cylinder is sequentially provided with a first compression slot arranged in the circumferential direction and an extension slot arranged in the axial direction. The locking shaft includes a shaft body passing through the inner clamping cylinder and a locking rod extending radially from the peripheral wall of the shaft body. The locking rod passes through the first compression slot and is driven to connect with the drive assembly to compress the first elastic member between the shaft body and the inner clamping cylinder. The drive assembly is used to drive the locking rod to rotate circumferentially along the first compression slot to the extension slot, so that the first elastic member elastically extends and drives the locking shaft to move toward the outer boom.

[0009] In this embodiment of the invention, the driving assembly further includes a rotary pusher and an outer pusher. The outer pusher is rotatably sleeved on the outside of the inner clamping cylinder and has a sliding groove on its peripheral wall arranged in the axial direction. The clamping rod passes through the clamping hole on the inner clamping cylinder and the sliding groove on the outer pusher in sequence. The rotary pusher is used to be mounted on the inner boom and to push the outer pusher to rotate circumferentially.

[0010] In this embodiment of the invention, the rotating pusher is a telescopic drive member, and a hinged mounting plate is provided on the outer peripheral wall of the outer push cylinder. The cylinder end of the telescopic drive member is rotatably mounted on the inner boom frame via a first connecting pin, and the telescopic end is movably hinged to the hinged mounting plate via a second connecting pin.

[0011] In this embodiment of the invention, a second compression slot is provided on the peripheral wall of the inner cylinder between the first compression slot and the extension slot, and an inclined guide surface is formed between the second compression slot and the slot surface of the extension slot that is located away from the first compression slot.

[0012] In this embodiment of the invention, the telescopic boom deceleration locking device further includes a position sensor disposed on the outer end of the locking shaft and used to detect the first stop member, so that the telescopic locking mechanism can determine the operating state of the inner boom based on the sensing signal of the position sensor.

[0013] In this embodiment of the invention, a first receiving space is provided at the outer end of the locking shaft, and the telescopic boom deceleration locking device further includes a sensor receiving mechanism. The sensor receiving mechanism includes a sensor mounting base and a second elastic member. The sensor mounting base can be axially moved and received in the first receiving space. The second elastic member is placed between the bottom wall of the first receiving space and the sensor mounting base. The position sensor is located on the outside of the sensor mounting base, and the size of the position sensor is less than or equal to the opening size of the first receiving space.

[0014] To achieve the above objectives, the present invention also provides a speed-reducing locking control method for telescopic booms, wherein the control method employs the speed-reducing locking device for telescopic booms described above, and includes:

[0015] If it is determined that the inner boom is in an abnormal operating state, the telescopic locking mechanism is controlled to drive the locking shaft to move toward the other of the outer boom and the inner boom, so that at least two first stop members sequentially decelerate and stop the locking shaft until the inner boom is locked onto the outer boom.

[0016] In this embodiment of the invention, the control method further includes:

[0017] If both the cable sensor and the position sensor detect that the inner boom is in a stall state, it is determined that the inner boom is in an abnormal operating state. The position sensor is located on the outer end of the locking shaft and is used to detect the first stop.

[0018] To achieve the above objectives, the present invention also provides an engineering machinery, wherein the engineering machinery includes a speed-reducing locking device for a telescopic boom as described above.

[0019] Through the above technical solution, the telescopic boom deceleration locking device provided in this embodiment of the invention has the following beneficial effects:

[0020] When the telescopic boom uses the aforementioned speed-reducing locking device, it includes a locking shaft, a telescopic locking mechanism, and a speed-reducing stop assembly. The telescopic locking mechanism is mounted on one of the outer boom and the inner boom, and is driven by the locking shaft to move the locking shaft toward the other of the outer boom and the inner boom. The speed-reducing stop assembly includes at least two first stop members, which are sequentially spaced along the telescopic direction of the inner boom on the other of the outer boom and the inner boom. By abutting against the locking shaft, they reduce the speed of the inner boom. That is, when the telescopic boom is in normal operation, the telescopic locking mechanism does not operate, and the locking shaft moves away from the at least two first stop members. The setup does not affect the normal operation of the telescopic boom. When the telescopic boom is in an abnormal operating state (e.g., the inner boom slides down rapidly due to a broken wire rope), the telescopic locking mechanism activates, driving the locking shaft to move towards the other of the outer and inner booms until it can sequentially abut against at least two first stops on the other of the outer and inner booms. Due to the sequential abutment between the locking shaft and the at least two first stops, the inner boom can be prevented from sliding down. The sliding speed of the inner boom gradually slows down until it is locked onto the outer boom due to the abutment between the locking shaft and the first stops, thereby preventing the telescopic boom from breaking and ensuring the safety of telescopic boom operation.

[0021] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0022] The accompanying drawings are provided to illustrate the invention and form part of the specification. They are used together with the following detailed description to explain the invention, but do not constitute a limitation thereof. In the drawings:

[0023] Figure 1 This is a control schematic diagram of a speed reduction locking device according to an embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the structure of the first stop and the second stop provided on the inner boom according to an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the speed reduction locking assembly and locking shaft according to an embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram of the telescopic locking mechanism disposed on the inner boom frame according to an embodiment of the present invention;

[0027] Figure 5 This is a schematic diagram of the structure of the rotating pusher and the outer pusher cylinder according to an embodiment of the present invention;

[0028] Figure 6 This is a cross-sectional structural diagram of the locking shaft, inner clasp, and outer push cylinder according to an embodiment of the present invention;

[0029] Figure 7 This is a schematic diagram of the locking shaft according to an embodiment of the present invention;

[0030] Figure 8 This is a schematic diagram of the inner retaining sleeve according to an embodiment of the present invention;

[0031] Figure 9 This is a schematic diagram of the structure of the outer pusher cylinder according to an embodiment of the present invention;

[0032] Figure 10 This is a schematic diagram of the structure of the locking rod being positioned on the first compression jaw and the locking shaft being away from the outer boom according to an embodiment of the present invention;

[0033] Figure 11 This is a schematic diagram of the structure of the locking rod being positioned on the extended locking slot and the locking shaft abutting against the outer boom according to an embodiment of the present invention;

[0034] Figure 12 This is a schematic diagram of the structure in which the locking rod is located on the second compression jaw and the locking shaft is away from the outer boom according to an embodiment of the present invention.

[0035] Explanation of reference numerals in the attached figures

[0036] 100 external boom 200 internal boom

[0037] 300 Locking Shaft 301 Shaft Body

[0038] 302 Lever 303 Second Containment Space

[0039] 304 First bearing component; 305 First containment space

[0040] 400 Telescopic locking mechanism; 401 Drive assembly

[0041] 402 Inner Cylinder; 403 First Elastic Component

[0042] 404 First compression bayonet 405 Extension bayonet

[0043] 406 Cylinder body; 407 Inner end cap

[0044] 408 Rotary pusher component; 409 Outer pusher cylinder

[0045] 410 Sliding groove 411 Hinge mounting plate

[0046] 412 First connecting pin; 413 Second connecting pin

[0047] 414 Second bearing component 415 Third bearing component

[0048] 416 Second compression bayonet 417 Guide surface

[0049] 500 First stop component 600 Second stop component

[0050] 700 Neutral 800 Position Sensor

[0051] 801 Controller 802 Pull-wire Sensor

[0052] 803 Control switch; 900 Sensor housing mechanism

[0053] 901 Sensor mounting base; 902 Second elastic element Detailed Implementation

[0054] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0055] The following description, with reference to the accompanying drawings, describes the speed-reducing locking device, control method, and engineering machinery for telescopic booms of the present invention.

[0056] like Figures 1 to 3 As shown, the present invention provides a speed-reducing locking device for telescopic booms, wherein the speed-reducing locking device for telescopic booms includes:

[0057] Locking shaft 300;

[0058] Telescopic locking mechanism 400 is used to be installed on one of the outer boom 100 and the inner boom 200, and is drivenly connected to locking shaft 300 to drive locking shaft 300 to move toward the other of the outer boom 100 and the inner boom 200.

[0059] The speed reduction and stop assembly includes at least two first stop members 500, which are arranged sequentially and spaced apart on the other of the outer boom 100 and the inner boom 200 along the telescopic direction of the inner boom 200, and respectively abut against the locking shaft 300 to reduce the speed of the inner boom 200.

[0060] When the telescopic boom uses the aforementioned speed-reducing locking device, it includes a locking shaft 300, a telescopic locking mechanism 400, and a speed-reducing stop assembly. The telescopic locking mechanism 400 is mounted on one of the outer boom 100 and the inner boom 200 and is drivenly connected to the locking shaft 300 to drive the locking shaft 300 to move toward the other of the outer boom 100 and the inner boom 200. The speed-reducing stop assembly includes at least two first stop members 500, which are sequentially spaced along the telescopic direction of the inner boom 200 on the other of the outer boom 100 and the inner boom 200. By abutting against the locking shaft 300, they reduce the speed of the inner boom 200. That is, when the telescopic boom is in normal operation, the telescopic locking mechanism 400 does not operate, and the locking shaft 300 is positioned away from the at least two first stop members 500, thus not affecting the normal operation of the telescopic boom. Specifically, as shown below... Figure 10 As shown; when the telescopic boom is in an abnormal operating state (e.g., the inner boom 200 rapidly slips due to a broken wire rope), the telescopic locking mechanism 400 activates, driving the locking shaft 300 to move towards the other of the outer boom 100 and the inner boom 200, until it can sequentially abut against at least two first stops 500 on the other of the outer boom 100 and the inner boom 200, specifically as follows. Figure 11 As shown, the sequential contact between the locking shaft 300 and at least two first stop members 500 can prevent the inner boom 200 from sliding down. The sliding speed of the inner boom 200 gradually decreases until it is locked onto the outer boom 100 due to the contact between the locking shaft 300 and the first stop members 500. This can prevent the telescopic boom from breaking and ensure the safety of the telescopic boom operation.

[0061] In this embodiment of the invention, the deceleration stop assembly further includes at least two second stop members 600, each corresponding to one of the at least two first stop members 500. A gap 700 is formed between each first stop member 500 and its corresponding second stop member 600, allowing the locking shaft 300 to pass through. That is, during the rapid descent of the inner boom 200, the left and right sides of the locking shaft 300 can respectively compress against the first stop member 500 and the second stop member 600. The addition of the second stop member 600 further slows down the descent speed of the inner boom 200 and ensures the stability of the final locking of the inner boom 200.

[0062] In this embodiment of the invention, the width of the neutral 700 is smaller than the diameter of the locking shaft 300 in its free state, and the inner ends of the first stop 500 and the second stop 600 (i.e., the ends that fit together to form the neutral 700) can undergo elastic deformation under the compression of the locking shaft 300, so that the locking shaft 300 can pass through the neutral 700. Specifically, the first stop 500 and the second stop 600 are designed as low-rigidity blocking strips, so that when the locking shaft 300 moves to the neutral 700, it undergoes elastic deformation due to the compression of the locking shaft 300, thereby increasing the width of the neutral 700, allowing the locking shaft 300 to pass through the neutral 700. Due to the compression between the locking shaft 300 and the first stop 500 and the second stop 600 respectively, the sliding speed of the inner boom 200 is reduced. Specifically, the first stop 500 and the second stop 600 can be thin metal blocking strips, and the metal blocking strips are welded to the other of the outer boom 100 and the inner boom 200. The width of the gap 700 between the welded ends of the first stop 500 and the second stop 600 is always smaller than the shaft diameter of the locking shaft 300. The width of the gap 700 between the free ends (the ends away from the welded ends) of the first stop 500 and the second stop 600 is the same as the width of the gap 700 at the fixed end in the free state, both being smaller than the shaft diameter of the locking shaft 300. In the state of being squeezed by the locking shaft 300, the width of the gap 700 between the free ends of the first stop 500 and the second stop 600 increases due to elastic deformation, allowing the locking shaft 300 to pass through the gap 700.

[0063] In this embodiment of the invention, each first stop 500 and its corresponding second stop 600 are arranged in a V-shape. The first stop 500 and the second stop 600 are inclined relative to the extension / retraction direction of the inner boom 200, thereby increasing the stopping distance between the first stop 500 and the second stop 600 and the locking shaft 300. The gap 700 between the first stop 500 and the second stop 600 is an opening at the apex of the V-shape. However, the invention is not limited to this; the first stop 500 and the second stop 600 can also be arranged perpendicular to the extension / retraction direction of the inner boom 200.

[0064] See Figure 1 , Figure 4 as well as Figures 6 to 8 In this embodiment of the invention, at least two first stop members 500 are sequentially spaced on the inner side of the outer boom 100. The telescopic locking mechanism 400 includes a drive assembly 401, an inner clamping cylinder 402, and a first elastic member 403. The inner clamping cylinder 402 is disposed on the inner boom 200 and extends axially from the inner side of the inner boom 200 to the outer side. The peripheral wall of the inner clamping cylinder 402 is sequentially provided with a first compression slot 404 arranged in the circumferential direction and an extension slot 405 arranged in the axial direction. That is, the locking surface of the first compression slot 404 is disposed near the inner boom 200, and the locking surface of the extension slot 405 is disposed near the outer boom 100. The locking shaft 300 includes a shaft body 301 passing through the inner clamping cylinder 402 and a locking rod 302 extending radially from the peripheral wall of the shaft body 301. The locking rod 302 passes through the first compression slot 401. 04 is connected to the drive assembly 401 to compress the first elastic element 403 between the shaft body 301 and the inner clamping cylinder 402. That is, when the clamping rod 302 is on the clamping surface of the first compression clamping slot 404, the locking shaft 300 is away from the stop on the outer boom 100, which does not affect the normal operation of the telescopic boom, and the first elastic element 403 is in a compressed state. In addition, when it is determined that the inner boom 200 is in an abnormal operating state, the drive assembly 401 can be controlled to drive the clamping rod 302 to rotate circumferentially along the first compression clamping slot 404. When it rotates to the extension clamping slot 405, due to the loss of clamping restriction, the compressed first elastic element 403 elastically extends and drives the locking shaft 300 to move toward the outer boom 100 until the clamping rod 302 moves to the clamping surface of the extension clamping slot 405, at which point the locking shaft 300 can abut against the stop on the outer boom 100. That is, when the inner boom 200 experiences rapid slippage, the drive assembly 401 and the first elastic element 403 cooperate to drive the locking shaft 300 to move to a position where it abuts against the stop on the outer boom 100, specifically as follows: Figure 11As shown, the latch 302 on the locking shaft 300 moves from the locking surface of the first compression latch 404 to the locking surface of the extension latch 405. Specifically, the first compression latch 404 and the extension latch 405 can be arranged in an inverted "7" shape to form a connected locking space.

[0065] It should be noted that locking rods 302 can be extended from both sides of the shaft body 301. The inner locking cylinder 402 is provided with corresponding locking spaces on both sides for the locking rods 302 on both sides of the shaft body 301 to pass through. The drive assembly 401 is used to drive the locking rod 302 on one side of the shaft body 301 to move.

[0066] Furthermore, the inner retaining cylinder 402 includes a cylinder body 406 and an inner end cap 407 detachably disposed at the inner end of the cylinder body 406. The inner end of the cylinder body 406 is the end of the cylinder body 406 located away from the outer boom 100. A second receiving space 303 is provided at the end of the shaft body 301 facing the inner end cap 407. One end of the first elastic member 403 is placed in the second receiving space 303 and abuts against the bottom wall of the second receiving space 303. The other end of the first elastic member 403 abuts against the inner end cap 407, so as to realize the function of locking the shaft 300 for rapid ejection through the first elastic member 403. At the same time, a first bearing member 304 is provided between the inner retaining cylinder 402 and the shaft body 301 to ensure smooth coaxial rotation between the two.

[0067] In addition, the stop can be installed on the inner boom 200, and the telescopic locking mechanism 400 is installed on the outer boom 100 and drivenly connected to the locking shaft 300. That is, during the rapid descent of the inner boom 200, the stop moves with the inner boom 200 and abuts against the locking shaft 300 on the outer boom 100.

[0068] like Figures 5 to 9As shown, in this embodiment of the invention, the drive assembly 401 further includes a rotary pusher 408 and an outer pusher 409. The outer pusher 409 is rotatably sleeved on the outside of the inner clamping cylinder 402 and has a sliding groove 410 arranged in the axial direction on its peripheral wall. The clamping rod 302 passes through the clamping hole on the inner clamping cylinder 402 and the sliding groove 410 on the outer pusher 409 in sequence. The rotary pusher 408 is used to be mounted on the inner boom 200 and to push the outer pusher 409 to rotate circumferentially. Since the inner clamping cylinder 402 is fixedly mounted on the inner boom 200, and the locking shaft 300 is rotatably mounted on the inner clamping cylinder 402, and the locking rod 302 on the locking shaft 300 passes through the buckle on the inner clamping cylinder 402 and the sliding groove 410 on the outer push cylinder 409, when the rotating pusher 408 pushes the outer push cylinder 409 to rotate circumferentially, it can simultaneously push the locking rod 302 of the locking shaft 300 to rotate circumferentially within the first compression slot 404 until it rotates to the extension slot 405. The locking rod 302 then loses the locking restriction of the first compression slot 404, and the elastic potential energy accumulated by the first elastic member 403 is released, driving the locking shaft 300 to move towards the locking surface of the extension slot 405. The addition of the outer push cylinder 409 ensures that the locking rod 302 always passes through the sliding groove 410, guiding the movement of the locking rod 302 and ensuring the stability of the locking shaft 300's movement. Specifically, sliding grooves 410 can also be provided on both sides of the outer push cylinder 409, so that the locking rods 302 on both sides of the shaft body 301 of the locking shaft 300 can pass through the outer push cylinder 409 one by one. Of course, the present invention is not limited to this. A telescopic push rod can also be directly added to the inner boom 200, and the telescopic end of the telescopic push rod is directly facing the locking rod 302. When it is determined that the inner boom 200 is in an abnormal operating state, the telescopic end of the telescopic push rod extends and directly pushes the locking rod 302 from the first compression slot 404 to the extension slot 405.

[0069] See Figure 5 and Figure 9In this embodiment of the invention, the rotating pusher 408 can be a telescopic drive member. A hinged mounting plate 411 is provided on the outer peripheral wall of the outer push cylinder 409. The cylinder end of the telescopic drive member is rotatably mounted on the inner boom 200 via a first connecting pin 412, and the telescopic end is movably hinged to the hinged mounting plate 411 via a second connecting pin 413. This converts the telescopic movement of the telescopic drive member into the rotational movement of the outer push cylinder 409. Compared to installing a rotating platform on the inner boom 200 to drive the outer push cylinder 409 to rotate, the installation is simpler and more convenient. Of course, the invention is not limited to this; it is also possible to provide a rotating platform on the inner boom 200, with the outer push cylinder 409 mounted on the rotating platform and rotated by the rotating platform. Specifically, a second bearing 414 and a third bearing 415 are provided between the outer push cylinder 409 and the inner clamping cylinder 402 to ensure smooth coaxial rotation between them. A shaft retaining ring and a hole retaining ring are also provided between the outer push cylinder 409 and the inner clamping cylinder 402 to provide an installation limit structure for the second bearing 414. The rotating pusher 408 can be an electric push rod.

[0070] Please see again Figure 8 In this embodiment of the invention, a second compression slot 416 is provided circumferentially between the first compression slot 404 and the extension slot 405 on the peripheral wall of the inner clamping cylinder 402. An inclined guide surface 417 is formed between the second compression slot 416 and the locking surface of the extension slot 405 away from the first compression slot 404. That is, when the inner boom 200 is locked to the outer boom 100 and the locking function needs to be unlocked, the electric push rod can be controlled to move in the opposite direction, pushing the outer push cylinder 409 to rotate in the opposite direction. This allows the locking rod 302 on the inner clamping cylinder 402 to move from the locking surface of the extension slot 405 through the guide surface 417 to the locking surface of the second compression slot 416, thus maintaining a certain gap between the locking shaft 300 and the outer boom 100. Specifically, as shown... Figure 12 As shown, this ensures that the telescopic boom can extend and retract, facilitating its disassembly and repair.

[0071] See Figure 6In this embodiment of the invention, the telescopic boom deceleration locking device further includes a position sensor 800 disposed on the outer end of the locking shaft 300 and used to detect the first stop member 500, so that the telescopic locking mechanism 400 can determine the operating state of the inner boom 200 based on the sensing signal of the position sensor 800. Therefore, whether the inner boom 200 is in an abnormal operating state can be detected not only by the cable sensor of the telescopic boom itself, but also by the position sensor 800 disposed on the outer end of the locking shaft 300, thereby ensuring against misoperation. Specifically, the position sensor 800 can determine whether the inner boom 200 is in an abnormal operating state of rapid descent by sequentially detecting at least two first stop members 500. Simultaneously, the at least two first stop members 500 are sequentially and evenly spaced on the inner side of the outer boom 100, and the position sensor 800 can be a proximity switch. It should be noted that the outer end of the locking shaft 300 is the end of the locking shaft 300 facing the outer boom 100.

[0072] Please see again Figure 1 In this embodiment of the invention, the telescopic boom deceleration locking device further includes a controller 801, which is communicatively connected to the cable sensor 802, the position sensor 800, and the rotary actuator 408, and is configured to:

[0073] Receive the sensing signals from the pull-wire sensor 802 and the position sensor 800;

[0074] When both the pull cable sensor 802 and the position sensor 800 detect that the inner boom 200 is in a stall state, the control rotary pusher 408 pushes the outer pusher 409 to rotate circumferentially, so that the clamping rod 302 on the inner clamping cylinder 402 rotates circumferentially from the first compression clamping port 404 to the extension clamping port 405.

[0075] Specifically, the telescopic boom deceleration locking device also includes a control switch 803 electrically connected to the controller 801. When the control switch 803 is turned on, the deceleration locking function is activated, and the cable sensor 802 and the position sensor 800 are in real-time monitoring. After receiving the signals from the cable sensor 802 and the position sensor 800, the controller 801 first determines whether the inner boom 200 is in a stall state based on the displacement change information of the inner boom 200. If the information received from the cable sensor 802 and the position sensor 800 simultaneously shows that the inner boom 200 is in a stall state, the controller 801 controls the electric push rod (i.e., the rotating pusher 408) to be energized. The electric push rod performs telescopic movement and drives the outer push cylinder 409 to rotate circumferentially, so that the locking rod 302 on the inner locking cylinder 402 rotates circumferentially from the first compression locking port 404 to the extension locking port 405. The first elastic element 403 drives the entire locking shaft 300 to spring out and abut against the outer boom 100. The controller 801 receives signals from the cable sensor 802 and the position sensor 800 to determine whether the inner boom 200 has stopped moving for a certain period of time. When the condition is met, the controller 801 controls the electric push rod to cut off the power, and the locking function is completed.

[0076] In this embodiment of the invention, a first receiving space 305 is provided at the outer end of the locking shaft 300. The telescopic boom deceleration locking device also includes a sensor receiving mechanism 900. The sensor receiving mechanism 900 includes a sensor mounting base 901 and a second elastic member 902. The sensor mounting base 901 is axially movable and received in the first receiving space 305. The second elastic member 902 is placed between the bottom wall of the first receiving space 305 and the sensor mounting base 901. The position sensor 800 is located on the outside of the sensor mounting base 901, and the size of the position sensor 800 is smaller than or equal to the opening size of the first receiving space 305. By adding the sensor housing mechanism 900, the position sensor 800 can detect the stop when there is a gap between the locking shaft 300 and the outer boom 100. When the inner boom 200 is decelerated and locked, the outer end of the locking shaft 300 abuts against the outer boom 100, thus pressing the position sensor 800 into the first housing space 305 from its opening. At this time, the sensor mounting base 901 compresses the second elastic member 902. Simultaneously, to allow the sensor mounting base 901 to be movably housed within the first housing space 305, the size of the sensor mounting base 901 should be larger than the opening size of the first housing space 305.

[0077] Specifically, the outer boom 100 is equipped with stoppers on both the left and right sides, and the inner boom 200 is equipped with corresponding locking shafts 300 on both the left and right sides.

[0078] To achieve the above objectives, the present invention also provides a speed-reducing locking control method for telescopic booms, wherein the control method employs the speed-reducing locking device for telescopic booms described above, and includes:

[0079] If it is determined that the inner boom 200 is in an abnormal operating state, the telescopic locking mechanism 400 is controlled to drive the locking shaft 300 to move toward the other of the outer boom 100 and the inner boom 200, so that at least two first stop members 500 sequentially decelerate and stop the locking shaft 300 until the inner boom 200 is locked onto the outer boom 100.

[0080] Specifically, when the inner boom 200 is in an abnormal operating state, i.e., when the inner boom 200 is in a rapid descent stall state, the rotating pusher 408 in the telescopic locking mechanism 400 pushes the outer push cylinder 409 to rotate circumferentially. This allows the locking rod 302, which passes through the sliding groove 410 of the outer push cylinder 409, to rotate circumferentially from the locking surface of the first compression slot 404 to the extension slot 405 on the inner locking cylinder 402. Under the elastic extension drive of the first elastic member 403, it moves to the locking surface of the extension slot 405, thereby realizing the rapid ejection function of the locking shaft 300 on the inner boom 200. It can then abut against the stop assembly in sequence and pass through the gap 700 between the stop assemblies under the squeezing action. Due to the squeezing action of multiple stop assemblies on the locking shaft 300, the inner boom 200 can be gradually decelerated, and finally locked under a small impact force. Furthermore, since the telescopic boom deceleration locking control method adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated here.

[0081] In this embodiment of the invention, the control method further includes:

[0082] If both the pull cable sensor 802 and the position sensor 800 receive a signal indicating that the inner boom 200 is in a stall state, it is determined that the inner boom 200 is in an abnormal operating state. The position sensor 800 is located on the outer end of the locking shaft 300 and is used to detect the first stop 500.

[0083] Whether the inner boom 200 is in an abnormal operating state can be detected not only by the cable sensor 802 of the telescopic boom itself, but also by the position sensor 800 set on the outer end of the locking shaft 300, thereby ensuring that malfunctions are prevented.

[0084] To achieve the above objectives, the present invention also provides an engineering machinery, wherein the engineering machinery includes a speed-reducing locking device for a telescopic boom as described above. Since the engineering machinery adopts all the technical solutions of the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated further here.

[0085] In the description of this invention, it should be understood that 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0086] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0087] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0088] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A speed reduction locking device for a telescopic boom, characterized by, The telescopic boom deceleration locking device includes: Locking shaft (300). Telescopic locking mechanism (400), which is configured on one of the outer boom (100) and the inner boom (200) and is drivenly connected to the locking shaft (300) to drive the locking shaft (300) to move toward the other of the outer boom (100) and the inner boom (200); The speed reduction and stop assembly includes at least two first stop members (500), which are arranged sequentially and spaced apart on the other of the outer boom (100) and the inner boom (200) along the telescopic direction of the inner boom (200), and respectively abut against the locking shaft (300) to reduce the speed of the inner boom (200); The telescopic locking mechanism includes a drive assembly (401), an inner clamping cylinder (402), and a first elastic element (403). The inner clamping cylinder (402) is disposed on one of the outer boom (100) and the inner boom (200). The peripheral wall of the inner clamping cylinder (402) is provided with a first compression slot (404) extending circumferentially and an extension slot (405) extending axially in sequence in the axial direction. The locking shaft (300) is disposed inside the inner clamping cylinder (402) and a locking rod (302) extends radially outward. The first elastic element (403) is driven to pass through the first compression slot (404) and be connected to the drive assembly (401) to compress the first elastic element (403) between the locking shaft (300) and the inner cylinder (402). The drive assembly (401) is used to drive the lever (302) to rotate circumferentially along the first compression slot (404) to the extension slot (405), so that the first elastic element (403) elastically extends and drives the locking shaft (300) to move toward the other of the outer boom (100) and the inner boom (200).

2. The speed reduction lockout device for a telescopic boom as claimed in claim 1, wherein The deceleration stop assembly further includes at least two second stop members (600), each of the at least two second stop members (600) being respectively configured in a one-to-one correspondence with at least two first stop members (500), and a gap (700) is formed between each first stop member (500) and the corresponding second stop member (600) for the locking shaft (300) to squeeze through.

3. The speed reduction lockout device for a telescopic boom as claimed in claim 2, wherein The width of the gap (700) is smaller than the diameter of the locking shaft (300) in the free state, and the inner ends of the first stop (500) and the second stop (600) can undergo elastic deformation under the compression of the locking shaft (300) so that the locking shaft (300) can pass through the gap (700).

4. The speed reduction lockout device for a telescopic boom as set forth in claim 2, wherein Each of the first stop members (500) and the corresponding second stop members (600) are arranged in a V-shape.

5. The speed reduction lockout device for a telescopic boom as claimed in claim 1, wherein At least two first stop members (500) are arranged sequentially at intervals on the inner side of the outer boom (100), the inner clamp (402) is arranged on the inner boom (200) and extends axially outward along the inner side of the inner boom (200), and the locking shaft (300) includes a shaft body (301) passing through the inner clamp (402) and a clamp rod (302) extending radially out of the peripheral wall of the shaft body (301).

6. The speed reduction lockout device for a telescopic boom as claimed in claim 5, wherein The drive assembly (401) further includes a rotary pusher (408) and an outer pusher (409). The outer pusher (409) is rotatably sleeved on the outside of the inner clamp (402) and has a sliding groove (410) on its peripheral wall arranged in the axial direction. The clamp (302) passes through the clamp on the inner clamp (402) and the sliding groove (410) on the outer pusher (409) in sequence. The rotary pusher (408) is used to be mounted on the inner boom (200) and to push the outer pusher (409) to rotate circumferentially.

7. The speed reduction lockout device for a telescopic boom as claimed in claim 6, wherein The rotating pusher (408) is a telescopic drive. The outer peripheral wall of the outer push cylinder (409) is provided with a hinged mounting plate (411). The cylinder end of the telescopic drive is rotatably mounted on the inner boom (200) via a first connecting pin (412), and the telescopic end is movably hinged to the hinged mounting plate (411) via a second connecting pin (413).

8. The speed reduction lockout device for a telescopic boom as claimed in claim 7, wherein The inner cylinder (402) has a second compression slot (416) arranged in the circumferential direction between the first compression slot (404) and the extension slot (405), and an inclined guide surface (417) is formed between the second compression slot (416) and the slotting surface of the extension slot (405) away from the first compression slot (404).

9. The speed reduction lockout device for a telescopic boom as claimed in any one of claims 1 to 8, characterized in that, The telescopic boom deceleration locking device further includes a position sensor (800) disposed on the outer end of the locking shaft (300) and used to detect the first stop (500), so that the telescopic locking mechanism (400) can determine the operating state of the inner boom (200) based on the sensing signal of the position sensor (800).

10. The speed reduction lockout device for a telescopic boom as set forth in claim 9, wherein The locking shaft (300) has a first receiving space (305) at its outer end. The telescopic boom deceleration locking device also includes a sensor receiving mechanism (900). The sensor receiving mechanism (900) includes a sensor mounting base (901) and a second elastic element (902). The sensor mounting base (901) is axially movable and received in the first receiving space (305). The second elastic element (902) is placed between the bottom wall of the first receiving space (305) and the sensor mounting base (901). The position sensor (800) is located on the outside of the sensor mounting base (901), and the size of the position sensor (800) is smaller than or equal to the opening size of the first receiving space (305).

11. A speed reduction and locking control method for a telescopic boom, characterized in that, The control method employs the telescopic boom deceleration locking device according to any one of claims 1 to 10, and includes: If it is determined that the inner boom (200) is in an abnormal operating state, the telescopic locking mechanism (400) is controlled to drive the locking shaft (300) to move toward the other of the outer boom (100) and the inner boom (200), so that at least two first stops (500) sequentially decelerate and stop the locking shaft (300) until the inner boom (200) is locked onto the outer boom (100).

12. The speed reduction and locking control method for telescopic booms according to claim 11, characterized in that, The control method further includes: If the sensing signals from both the cable sensor and the position sensor (800) are a stall sensing signal for the inner boom (200), it is determined that the inner boom (200) is in an abnormal operating state. The position sensor (800) is located on the outer end of the locking shaft (300) and is used to detect the first stop (500).

13. An engineering machinery, characterized in that, The construction machinery includes a speed-reducing locking device for a telescopic boom as described in any one of claims 1 to 10.

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