Interlocking device and crane

Abstract

The application relates to the technical field of engineering machinery, and discloses an interlocking device and a crane. The interlocking device comprises a first bolt, a second bolt, a first locking assembly, a second locking assembly and a transmission assembly. The first locking assembly has a first locking state of locking the first bolt and a first release state of releasing the first bolt; the second locking assembly has a second locking state of locking the second bolt and a second release state of releasing the second bolt. The transmission assembly connects the first locking assembly and the second locking assembly, and makes the states of the two opposite. When the first bolt is in a connection state, the first locking assembly is allowed to switch to the first locking state; when the second bolt is in the connection state, the second locking assembly is allowed to switch to the second locking state. The application forcibly stipulates the bolt operation sequence through pure mechanical interlocking, effectively prevents components from falling due to mistaken bolt pulling, and has the advantages of reliable structure and no need of external energy.

Description

Technical Field

[0001] This invention relates to the field of engineering machinery technology, specifically to interlocking devices and cranes. Background Technology

[0002] Cranes are essential lifting equipment in infrastructure, wind power, nuclear power, and other construction fields. Among them, wheeled cranes are widely used due to their excellent off-road performance and operational flexibility. The jib, as an extension of the main boom, is used to achieve higher and farther lifting operations.

[0003] However, during the deployment and retraction of the boom, the slewing pin and the boom head pin need to be inserted and removed in sequence. If the operator, due to negligence or misoperation, pulls out the other pin before inserting one of them, the entire boom will fall, causing serious personal injury and property damage. Summary of the Invention

[0004] In view of this, the present invention provides an interlocking device and a crane to solve the problem of "incorrect insertion and removal sequence of pins during the disassembly and assembly of the crane jib, which leads to the jib falling off".

[0005] In a first aspect, the present invention provides an interlocking device applied to engineering machinery. The engineering machinery has a first component and a second component, including a first pin, a second pin, a first locking assembly, a second locking assembly, and a transmission assembly. The first pin is used to connect the first component and the second component; the second pin is used to connect the first component and the second component; a first connection point and a second connection point are provided between the first component and the second component, the first pin can be inserted into the first connection point, and the second pin can be inserted into the second connection point; the first locking assembly has a first locking state for locking the first pin and a first releasing state for releasing the first pin; the second locking assembly has a second locking state for locking the second pin and a second releasing state for releasing the second pin; the transmission assembly connects the first locking assembly and the second locking assembly, and the transmission assembly is used to reverse the states of the first locking assembly and the second locking assembly; when the first pin is in the connected state, the first locking assembly is allowed to switch to the first locking state; when the second pin is in the connected state, the second locking assembly is allowed to switch to the second locking state.

[0006] In one alternative embodiment, the first locking assembly includes a first locking member movably disposed on the second member. The first locking member is used to prevent the first pin from being pulled out in a first locked state and to avoid the first pin in a first released state.

[0007] In one alternative embodiment, the first locking assembly further includes a first detection element disposed on the first member and moving with the insertion and removal of the first pin; when the first pin is fully inserted, the first detection element clears the movement path of the first locking member; when the first pin is not fully inserted or removed, the first detection element blocks the movement path of the first locking member.

[0008] In one alternative embodiment, the second locking assembly includes a second locking member movably disposed on the second member, the second locking member being used to prevent the second pin from being pulled out in the second locked state and to avoid the second pin in the second released state.

[0009] In one alternative embodiment, the second locking assembly further includes a second detection element, which includes a movable baffle disposed at the second connection of the second member and has a first position that closes the second connection and a second position that opens the second connection.

[0010] In one alternative embodiment, the second detection element further includes a trigger part connected to the movable baffle, the trigger part being used to move the movable baffle to a first position or a second position.

[0011] In one alternative embodiment, the movable baffle is further provided with a through hole, which coincides with the axis of the second locking member when the second pin is in the connected state. The through hole is aligned with the second locking member.

[0012] In one alternative embodiment, a position retainer is further included, disposed on the second member and abutting against the first locking member; when the first locking component is in the first released state, the position retainer is used to prevent the first locking component from switching from the first released state to the first locked state.

[0013] In one alternative embodiment, the position retainer has an extended position and a retracted position; when the second member approaches the first member, the position retainer is compressed to the retracted position by the first member; when the second member moves away from the first member, the position retainer springs to the extended position, blocking the movement of the first locking member.

[0014] In one alternative implementation, the construction machinery is a crane, the first component is the main boom of the crane, and the second component is the auxiliary boom of the crane.

[0015] In a second aspect, the present invention also provides a crane including the interlocking device described in the first aspect.

[0016] The technical solution proposed in this application has at least the following technical effects: This invention provides a first locking component and a second locking component corresponding to the first and second pins, respectively. A transmission component reverses their states, and each locking component is limited to switching to the locking state only when its corresponding pin is in the connected state. This ensures that at least one pin is locked by the locking component and cannot be pulled out at any given time. This fundamentally avoids the situation where both pins are pulled out simultaneously due to incorrect operation sequence, effectively preventing the auxiliary arm from accidentally falling, and enforces the correct insertion and removal sequence without relying on the operator's experience or attention.

[0017] Operators can complete the operation without additional testing steps, simplifying the process and improving efficiency. Furthermore, this interlocking device is not limited to the main and auxiliary booms of cranes; it is applicable to any construction machinery that connects the first and second components via two pins. Its compact structure facilitates modification of existing equipment, demonstrating excellent versatility and potential for widespread adoption. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the first locking component of an interlocking device according to an embodiment of the present invention in a first locking state; Figure 2 This is a schematic diagram of the second locking component of an interlocking device according to an embodiment of the present invention in a second locking state; Figure 3 This is a schematic diagram of the second locking component of another interlocking device according to an embodiment of the present invention in a second locking state; Figure 4 This is a structural diagram of the first pin and the first locking assembly of an interlocking device according to an embodiment of the present invention; Figure 5 This is a structural diagram of the first pin and the first locking assembly of another interlocking device according to an embodiment of the present invention; Figure 6 This is a structural diagram of the second pin and the second locking assembly of an interlocking device according to an embodiment of the present invention; Figure 7 This is a structural diagram of the second pin and the second locking assembly of another interlocking device according to an embodiment of the present invention.

[0020] Explanation of reference numerals in the attached figures: 1. First pin; 2. Second pin; 3. First locking assembly; 30. First locking element; 31. First detection element; 4. Second locking assembly; 40. Second locking element; 41. Second detection element; 411. Movable baffle; 4111. Through hole; 412. Trigger; 5. Transmission assembly; 6. First component; 7. Second component; 8. Position holding component. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] It should be understood that the terminology used herein is for the purpose of describing specific embodiments only and is not intended to impose strict limitations on the technical solutions unless the context clearly indicates otherwise. For example, the use of "a," "an," and "the" to modify a feature does not preclude the possibility that the feature may be plural in other embodiments.

[0023] It should be understood that the terms "comprising," "including," and "having" are open-ended, indicating the presence of the stated features but not excluding the possibility of other features in the embodiment. Similarly, the use of terms such as "first," "second," etc., to describe multiple features only indicates the distinction between one feature and another, and such terms do not imply order or sequence unless explicitly stated in the context.

[0024] It should be understood that, unless the context clearly indicates otherwise, the terms "setup," "connection," and "installation" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integrated connection; they can refer to a direct connection or an indirect connection via a medium. Those skilled in the art will understand the specific meaning of these terms in this document based on the specific circumstances.

[0025] In addition, for ease of description, the text will use terms of spatial relative relationship to describe the position of one feature relative to another feature, such as "inner", "outer", "end", "side", "upper", "middle", "lower", "high", "low", "axial", "circumferential", "radial", "horizontal", "vertical", "first direction", "second direction", etc. It can be understood that the spatial relative relationship between two features should include other specific situations besides those shown in the accompanying drawings of the specification.

[0026] The main load-bearing components of a crane include the frame, slewing bearing, cab, power system, main boom, and jib. The main boom is the basic lifting component of the crane, typically a telescopic box-type structure that can extend and retract along its length to change the working radius and height. At the end of the main boom (i.e., the boom head), there is a main boom head pulley axle for connecting to the jib or hook pulley block.

[0027] The jib is an extension of the main boom, designed to achieve a higher and farther lifting capacity than when the main boom is used alone. In driving conditions, the jib is typically folded along the side of the main boom and secured by a bracket. During use, the jib needs to be unfolded from its folded position to a position roughly in line with the main boom using auxiliary mechanisms such as push-pull cylinders, and then secured to the main boom with pins.

[0028] In existing cranes, the connection between the main boom and the jib is typically achieved using two pins: a slewing pin and a boom head pin. The deployment and retraction of the jib must follow a specific sequence: when deploying, the boom head pin must be inserted first, then the slewing pin removed; the retraction is the reverse. However, existing cranes generally lack a mandatory mechanism to enforce this operational sequence, and the correctness of the operation depends entirely on the operator's experience, attention, and sense of responsibility. If an operator makes a mistake due to negligence, fatigue, or unfamiliarity with the process (e.g., removing the slewing pin without inserting the boom head pin), the jib will suddenly fall due to the loss of all fixed connection points, causing serious personal injury and property damage.

[0029] In related technologies, various solutions have been proposed to prevent the boom from falling off, such as using triangular plate hooks, double-point push-pull cylinders, and cylinder self-locking structures. However, all of these technologies have significant shortcomings: some solutions are reactive, only able to intercept the boom after it falls, and cannot prevent accidents at the source; moreover, they are difficult to deploy due to space constraints.

[0030] The embodiments of this application are described below with reference to the accompanying drawings. It can be understood that the technical features involved in the different embodiments described below can be combined with each other as long as they do not conflict with each other.

[0031] The following is combined Figures 1 to 7 The following describes embodiments of the present invention.

[0032] According to an embodiment of the present invention, in a first aspect, referring to Figures 1 to 3An interlocking device is provided for use in construction machinery. The construction machinery has a first component 6 and a second component 7, including a first pin 1, a second pin 2, a first locking assembly 3, a second locking assembly 4, and a transmission assembly 5. The first pin 1 is used to connect the first component 6 and the second component 7; the second pin 2 is used to connect the first component 6 and the second component 7; a first connection point and a second connection point are provided between the first component 6 and the second component 7, the first pin 1 can be inserted into the first connection point, and the second pin 2 can be inserted into the second connection point; the first locking assembly 3 has a locking function for locking the first component 6 and the second component 7. A first locking state of a first pin 1 and a first releasing state of releasing the first pin 1; a second locking assembly 4 having a second locking state of locking the second pin 2 and a second releasing state of releasing the second pin 2; a transmission assembly 5 connecting the first locking assembly 3 and the second locking assembly 4, the transmission assembly 5 being used to reverse the states of the first locking assembly 3 and the second locking assembly 4; when the first pin 1 is in the connected state, the first locking assembly 3 is allowed to switch to the first locking state; when the second pin 2 is in the connected state, the second locking member 40 is allowed to switch to the second locking state.

[0033] In this embodiment, the first locking assembly 3 includes a first locking member 30 and a first detection member 31. The first locking member 30 is movably disposed on the second member 7. When the first locking member 30 is in a first locked state, the first locking member 30 blocks the pull-out path of the first pin 1; when the first locking member 30 is in a first released state, the first locking member 30 avoids the first pin 1. The first detection member 31 is linked to the first pin 1, and the first detection member 31 only allows the first locking member 30 to move to the blocking position when the first pin 1 is fully inserted into the first connection and is in a reliable connection state.

[0034] For example, the first detection element 31 can be a tongue plate or blocking block that is fixedly connected or linked to the first pin 1. When the first pin 1 is inserted, the blocking block is pushed open to make way for the movement of the first locking element 30. When the first pin 1 is not inserted or is not fully inserted, the blocking block occupies the channel and prevents the first locking element 30 from moving.

[0035] Understandably, the second locking assembly 4 includes a second locking member 40 and a second detection member 41. The second locking member 40 is movably disposed on the second member 7 for locking or releasing the second pin 2. The second detection member 41 is disposed near the second connection point of the second member 7 and includes a movable baffle 411 and a trigger 412. When the second member 7 approaches the first member 6, the trigger 412 is pressed, causing the movable baffle 411 to partially open the pin hole, allowing the second pin 2 to be inserted. Only when the second pin 2 is fully inserted and in the connected state will the clearance hole on the movable baffle 411 align with the second locking member 40, at which point the second locking member 40 is allowed to move to the position where the second pin 2 is locked.

[0036] Specifically, the transmission assembly 5 employs a flexible push-pull shaft. The two ends of the outer sleeve of this shaft are fixed to corresponding mounting points on the second component 7, while the two ends of the inner core are connected to the first locking member 30 and the second locking member 40, respectively. When the operator pushes or pulls the ear plate connected to the flexible shaft, the inner core moves axially relative to the outer sleeve, thereby linking the first locking member 30 and the second locking member 40 in opposite states: that is, when the flexible shaft pushes the first locking member 30 from the released state to the locked state, the flexible shaft simultaneously pulls the second locking member 40 from the locked state to the released state; conversely, when the flexible shaft pulls the first locking member 30 back to the released state, the second locking member 40 is pushed to the locked state. Through this flexible transmission method, even when there is relative movement or space constraints in the second component 7, the reverse linkage between the two locking members can be reliably achieved, ensuring that only one locking member is in the locked state and the other is in the released state at any given time.

[0037] In one embodiment, refer to Figure 4 and Figure 5 The first locking assembly 3 includes a first locking member 30, which is movably disposed on the second member 7. The first locking member 30 is used to block the first pin 1 from being pulled out in the first locked state and to avoid the first pin 1 in the first released state.

[0038] In this embodiment, the first locking assembly 3 includes a first locking member 30, which is movably disposed on the second member 7. The first locking member 30 is used to prevent the first pin 1 from being pulled out in the first locked state and to avoid the first pin 1 in the first released state. The first locking assembly 3 also includes a first detection member 31, which is linked to the first pin 1. The first detection member 31 only allows the first locking member 30 to move from the first released state to the first locked state when the first pin 1 is in the connected state. For example, the first detection member 31 can be a blocking block or a tongue plate fixedly connected to the first pin 1. When the first pin 1 is inserted into place, the blocking block is moved to make way for the movement channel of the first locking member 30. When the first pin 1 is not inserted or is not fully inserted, the blocking block occupies the channel and prevents the first locking member 30 from moving to the locked position.

[0039] The transmission assembly 5 connects the first locking member 30 and the second locking member 40, such that the states of the first locking member 30 and the second locking member 40 are opposite. The operator drives the transmission assembly 5 by pushing or pulling the lugs on it. When the first locking member 30 switches from the released state to the locked state, the second locking member 40 simultaneously switches from the locked state to the released state; conversely, when the first locking member 30 switches from the locked state to the released state, the second locking member 40 simultaneously switches from the released state to the locked state.

[0040] In one embodiment, refer to Figure 4 and Figure 5 The first locking component 3 also includes a first detection element 31, which is disposed on the first component 6 and moves with the insertion and removal of the first pin 1. When the first pin 1 is fully inserted, the first detection element 31 clears the movement path of the first locking component 30. When the first pin 1 is not fully inserted or removed, the first detection element 31 blocks the movement path of the first locking component 30.

[0041] Specifically, the first detection element 31 is a tongue plate connected to the first pin 1, which can move with the first pin 1. When the first pin 1 is inserted into place, the tongue plate is pushed out of the movement path of the first locking element 30; when the first pin 1 is pulled out or not fully inserted, the tongue plate returns to its original position and occupies the path, thereby preventing the first locking element 30 from moving to the locked position. Through this purely mechanical linkage, it is ensured that the first locking element 30 is ready to switch to the locked state only when the first pin 1 is in a reliable connection state.

[0042] In one embodiment, refer to Figure 6 and Figure 7 The second locking assembly 4 includes a second locking member 40, which is movably disposed on the second member 7. The second locking member 40 is used to prevent the second pin 2 from being pulled out in the second locked state and to avoid the second pin 2 in the second released state.

[0043] In this embodiment, the second locking assembly 4 includes a second locking member 40, which is movably disposed on the second member 7. The second locking member 40 is used to prevent the second pin 2 from being pulled out in the second locked state and to avoid the second pin 2 in the second released state. The second locking assembly 4 also includes a second detection member 41, which is disposed near the second connection of the second member 7 and is used to detect whether the second pin 2 is in the connected state.

[0044] Specifically, the second locking member 40 is generally slender and cylindrical, possessing a certain axial length and shear strength. The second locking member 40 is installed near the second connection point of the second component 7, specifically on one side of the insertion hole of the second pin 2. Its axial direction is perpendicular to or intersects the axial direction of the second pin 2, so that it can engage with the annular groove or end face of the second pin 2 when extended, thereby preventing the second pin 2 from being pulled out axially. The second component 7 is provided with clamping or fixing parts for the second locking member 40, allowing the second locking member 40 to slide reciprocally along its own axis, with the sliding direction towards or away from the second pin 2. One end of the second locking member 40 faces the second pin 2; this end can be designed as a flat head, hemispherical head, or conical head to facilitate engagement with the groove on the second pin 2. The other end is connected to the transmission assembly 5, receiving the push-pull force from the transmission assembly 5. With the above-described structure and positional arrangement, the second locking member 40 can reliably lock the second pin 2 after it is connected in place, and can stably switch between the locked state and the released state under the control of the transmission assembly 5.

[0045] In one embodiment, refer to Figure 6 and Figure 7 The second locking assembly 4 also includes a second detection element 41, which includes a movable baffle 411. The movable baffle 411 is disposed at the second connection of the second component 7 and has a first position that closes the second connection and a second position that opens the second connection.

[0046] Specifically, the second detection element 41 may include a movable baffle 411 and a trigger 412. When the second component 7 approaches the first component 6, the trigger 412 is pressed and drives the movable baffle 411 to move, causing the movable baffle 411 to partially open the pin hole, allowing the second pin 2 to be inserted. Only when the second pin 2 is fully inserted and in a reliable connection state will the clearance hole on the movable baffle 411 align with the second locking element 40, at which point the second locking element 40 is allowed to move from the second release state to the second locking state. If the second pin 2 is not inserted or is not fully inserted, the clearance hole on the movable baffle 411 is misaligned with the second locking element 40, and the second locking element 40 is blocked and cannot move to the locking position. Through this mechanical linkage, it is ensured that the second locking element 40 can lock the second pin 2 only when the second pin 2 is properly connected, thereby achieving a forced constraint on the operation sequence.

[0047] In one embodiment, refer to Figure 6 and Figure 7 The second detection element 41 also includes a trigger part 412, which is connected to the movable baffle 411. The trigger part 412 is used to drive the movable baffle 411 to move to the first position or the second position.

[0048] The trigger part 412 is a slender rod-shaped part, specifically a trigger pin or detection pin. The trigger part 412 is installed at the second connection point of the second component 7, specifically on the side of the second component 7 facing the first component 6, that is, at the fork hole position of the second component 7. The front end of the trigger part 412 is connected to the movable baffle 411, and the rear end is fixedly connected to the second component 7.

[0049] Furthermore, the trigger part 412 has an internal elastic element and an external housing connected to it. Specifically, the elastic element is a compression spring, with one end abutting the shoulder of the trigger part 412 and the other end abutting the internal mounting surface of the trigger part 412. The elastic element constantly applies an elastic force to the trigger part 412, causing its front end to extend. In the free state, the trigger part 412 is in the extended position under the action of the elastic element, at which time the movable baffle 411 is in the first position, closing the pin hole. When the second component 7 approaches the first component 6, the surface of the first component 6 first contacts and presses against one end of the trigger part 412, forcing the trigger part 412 to retract into the second component 7 against the elastic force. The retraction movement of the trigger part 412 is transmitted to the movable baffle 411 through its rear end or a linkage mechanism, causing the movable baffle 411 to move from the first position to the second position, i.e., the position where the pin hole is partially opened for the insertion of the second pin 2.

[0050] Understandably, the stroke length of the trigger part 412 is proportional to the moving distance of the movable baffle 411, ensuring that when the second component 7 and the first component 6 are fully engaged, the trigger part 412 is compressed to its limit position, and the movable baffle 411 moves precisely to the second position where the pin hole is fully open. When the second component 7 moves away from the first component 6, the trigger part 412 automatically extends and resets under the action of the elastic element, driving the movable baffle 411 back to the first position where the pin hole is closed. Through the above structure and position arrangement, the trigger part 412 can accurately sense the proximity of the second component 7 and the first component 6, and convert this mechanical signal into the displacement of the movable baffle 411, thereby realizing automatic control of the insertion condition of the second pin 2.

[0051] In one embodiment, refer to Figure 6 and Figure 7 The movable baffle 411 is also provided with a through hole 4111. When the second pin 2 is in the connected state, the through hole 4111 coincides with the axis of the second locking member 40. The through hole 4111 is aligned with the second locking member 40.

[0052] In this embodiment, the movable baffle 411 is composed of two plate-like structures arranged at an included angle, rotatably mounted at the second connection point of the second component 7, with a through hole 4111 on its surface. The diameter of the through hole 4111 is slightly larger than the diameter of the front end of the second locking member 40, allowing the second locking member 40 to pass through. The movable baffle 411 is linked with the trigger part 412. When the trigger part 412 is pressed, the movable baffle 411 moves to the second position of the open pin hole. When the second pin 2 is fully inserted and in a reliable connection state, the end of the second pin 2 or the structure linked to it will push the movable baffle 411 to move a small distance further, so that the through hole 4111 on the movable baffle 411 moves exactly to a position coinciding with the axis of the second locking member 40. At this time, the second locking member 40 moves from the released state to the locked state, its front end passing through the through hole 4111 and entering the slot of the second pin 2 or abutting against the end face of the second pin 2, thereby completing the locking.

[0053] Furthermore, if the second pin 2 is not inserted or not fully inserted, the through hole 4111 remains offset from the second locking member 40, and the second locking member 40 is blocked by the solid portion of the movable baffle 411 and cannot extend. Through this design, the movable baffle 411 not only controls the insertion channel of the second pin 2, but also further verifies whether the second pin 2 is fully connected in place. Only when both conditions are met can the movement path of the second locking member 40 be unlocked, thereby enhancing the reliability of the interlock.

[0054] In one embodiment, refer to Figure 4 and Figure 5 It also includes a position retainer 8, which is disposed on the second member 7 and abuts against the first locking member 30; when the first locking component 3 is in the first released state, the position retainer 8 is used to prevent the first locking component 3 from switching from the first released state to the first locking state.

[0055] In this embodiment, the interlocking device further includes a position holding member 8. The position holding member 8 is disposed on the second member 7 and maintains an abutting or separable contact relationship with the first locking member 30.

[0056] Specifically, the position retaining member 8 can be an elastic telescopic pin, installed on the second component 7 near the first locking member 30, with its extension direction perpendicular to the movement direction of the first locking member 30. When the first locking component 3 is in the first released state, the position retaining member 8 extends under the action of elastic force and abuts against the side or end face of the first locking member 30, thereby locking the first locking member 30 in the current released position and preventing it from switching to the first locked state. Only when the second component 7 and the first component 6 are in a predetermined connection position will the position retaining member 8 be compressed by external force and retracted, releasing the obstruction to the first locking member 30.

[0057] In this embodiment, the position retaining member 8 adopts a structure similar to a spring pin, but it has a protrusion to prevent the first locking member 30 from moving forward when extended. Specifically, the position retaining member 8 includes a cylindrical outer shell, a protrusion, and an elastic element. The outer shell is fixedly mounted on the second member 7, and its interior has an axially extending receiving cavity. A protrusion is provided on the side facing the first locking member 30. This protrusion is coaxially arranged with the elastic element and extends outward to form a blocking surface with a certain thickness and width. The telescopic pin is movably disposed in the receiving cavity of the outer shell, with its front end extending or retracting at the opening end of the outer shell, and its rear end abutting against the protrusion. The elastic element is installed inside the outer shell and always applies an elastic force to the telescopic pin to extend it outward. In the free state, the telescopic pin extends out of the outer shell under the action of the elastic element. At this time, the protrusion on the outer shell is in the extended position, and its blocking surface is exactly located on the movement path of the first locking member 30. When the first locking member 30 attempts to move from the first released state to the first locked state, its front end or sidewall interferes with the blocking surface of the protrusion, thus preventing further movement. Only when the telescopic pin is compressed by an external force and retracts into the housing does the protrusion move along with the entire housing, opening the path for the first locking member 30. This external force typically originates from the relative movement between the second member 7 and the first member 6; for example, when the second member 7 approaches the first member 6, the corresponding surface on the first member 6 compresses the telescopic pin, causing it to retract. Through this housing design with a protrusion, the position retainer 8 can achieve its blocking function without relying on direct contact between the telescopic pin and the first locking member 30. The protrusion provides a larger contact area and a more reliable blocking effect, while reducing the risk of wear on the telescopic pin.

[0058] In one embodiment, refer to Figure 4 and Figure 5 The position retainer 8 has an extended position and a retracted position; when the second member 7 approaches the first member 6, the position retainer 8 is compressed to the retracted position by the first member 6; when the second member 7 moves away from the first member 6, the position retainer 8 springs to the extended position, blocking the movement of the first locking member 30.

[0059] In this embodiment, the position retainer 8 has an extended position and a retracted position. The position retainer 8 is mounted on the second component 7, with its front end facing the first component 6. When the second component 7 approaches the first component 6, the surface of the first component 6 contacts and presses against the front end of the position retainer 8, causing the position retainer 8 to retract into the second component 7 against internal elastic force, thus switching to the retracted position. At this time, the obstruction of the position retainer 8 on the first locking component 30 is released, and the first locking component 30 can freely move from the first released state to the first locked state. When the second component 7 moves away from the first component 6, the pressure of the first component 6 on the position retainer 8 disappears, and the position retainer 8 automatically extends under the action of the internal elastic element, switching to the extended position. In the extended position, the body of the position retainer 8 or its associated structure is directly located on the movement path of the first locking component 30, thereby preventing the first locking component 30 from switching from the first released state to the first locked state. In this way, the position retaining member 8 can automatically and selectively allow or prohibit the first locking member 30 from entering the locking state based on the relative distance between the second member 7 and the first member 6. This effectively prevents the first locking member 30 from accidentally extending due to vibration or misoperation when the second member 7 has disengaged from the first connection point, causing the second locking member 40 to enter the released state from the locked state, thereby causing the second pin 2 to lose its locking limit. The position retaining member 8 can adopt a specific structure of a spring detection pin, that is, including a housing, a telescopic pin, and a compression spring. The telescopic pin can extend and retract relative to the housing under the action of the spring, thereby realizing the switching between the extended position and the retracted position.

[0060] In one embodiment, the construction machinery is a crane, the first component 6 is the main boom of the crane, and the second component 7 is the auxiliary boom of the crane.

[0061] According to an embodiment of the present invention, a second aspect also provides a crane including the interlocking device of the first aspect.

[0062] In this embodiment, since the crane proposed in the second aspect includes the interlocking device of the first aspect, the crane has the same effect as the interlocking device, and the specific technical effects of the crane will not be described in detail here.

[0063] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. An interlocking device applied to construction machinery, the construction machinery having a first component (6) and a second component (7), the interlocking device being characterized in that, include: The first pin (1) is used to connect the first component (6) and the second component (7); The second pin (2) is used to connect the first component (6) and the second component (7); A first connection and a second connection are provided between the first component (6) and the second component (7). The first pin (1) can be inserted into the first connection and the second pin (2) can be inserted into the second connection. The first locking component (3) has a first locking state that locks the first pin (1) and a first releasing state that releases the first pin (1); The second locking assembly (4) has a second locking state that locks the second pin (2) and a second releasing state that releases the second pin (2); A transmission assembly (5) connects the first locking assembly (3) and the second locking assembly (4), the transmission assembly (5) being used to reverse the state of the first locking assembly (3) and the second locking assembly (4); When the first pin (1) is in the connected state, the first locking component (3) is allowed to switch to the first locking state; When the second pin (2) is in the connected state, the second locking member (40) is allowed to switch to the second locking state.

2. The interlocking device according to claim 1, characterized in that, The first locking assembly (3) includes a first locking member (30), which is movably disposed on the second member (7). The first locking member (30) is used to block the first pin (1) from being pulled out in the first locking state and to avoid the first pin (1) in the first releasing state.

3. The interlocking device according to claim 2, characterized in that, The first locking component (3) further includes a first detection element (31), which is disposed on the first member (6) and moves with the insertion and removal of the first pin (1); when the first pin (1) is fully inserted, the first detection element (31) clears the movement path of the first locking member (30); when the first pin (1) is not fully inserted or removed, the first detection element (31) blocks the movement path of the first locking member (30).

4. The interlocking device according to claim 1, characterized in that, The second locking assembly (4) includes a second locking member (40), which is movably disposed on the second member (7). The second locking member (40) is used to block the second pin (2) from being pulled out in the second locking state and to avoid the second pin (2) in the second releasing state.

5. The interlocking device according to claim 4, characterized in that, The second locking component (4) further includes a second detection element (41), which includes a movable baffle (411) disposed at the second connection of the second component (7) and has a first position that closes the second connection and a second position that opens the second connection.

6. The interlocking device according to claim 5, characterized in that, The second detection element (41) further includes a trigger part (412), which is connected to the movable baffle (411). The trigger part (412) is used to drive the movable baffle (411) to move to the first position or the second position.

7. The interlocking device according to claim 5, characterized in that, The movable baffle (411) is also provided with a through hole (4111). When the second pin (2) is in the connected state, the through hole (4111) coincides with the axis of the second locking member (40) and the through hole (4111) is aligned with the second locking member (40).

8. The interlocking device according to claim 1, characterized in that, It also includes a position holding member (8), which is disposed on the second member (7) and abuts against the first locking member (30); When the first locking component (3) is in the first released state, the position holding member (8) is used to prevent the first locking component (3) from switching from the first released state to the first locking state.

9. The interlocking device according to claim 8, characterized in that, The position retainer (8) has an extended position and a retracted position; when the second member (7) approaches the first member (6), the position retainer (8) is compressed to the retracted position by the first member (6); when the second member (7) moves away from the first member (6), the position retainer (8) springs to the extended position, blocking the movement of the first locking member (30).

10. The interlocking device according to claim 1, characterized in that, The construction machinery is a crane, the first component (6) is the main boom of the crane, and the second component (7) is the auxiliary boom of the crane.

11. A crane, characterized in that, Includes the interlocking device according to any one of claims 1 to 10.

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