Boom device and construction machine

Abstract

The present application provides a boom device and a construction machine. The boom device comprises: a boom structure having a first end hingedly connected to a first hinge point of a turntable; a luffing cylinder having a first end hingedly connected to a second hinge point of the turntable and a second end hingedly connected to a third hinge point of the boom structure; and an auxiliary cylinder having a first end hingedly connected to a fourth hinge point of the turntable and a second end hingedly connected to a fifth hinge point of the boom structure. The luffing cylinder and the auxiliary cylinder are used to synchronously drive the raising of the boom structure; the fourth hinge point is located between the first hinge point and a second end of the boom structure; and the fourth hinge point is arranged close to the first hinge point. In the boom device of the present application, the luffing cylinder and the auxiliary cylinder are mounted on the turntable, and the luffing cylinder and the auxiliary cylinder are supported by the turntable, so that the luffing cylinder and the auxiliary cylinder can work in conjunction with each other to jointly drive the raising of the boom structure, ensuring support strength while avoiding insufficient boom raising force, thereby ensuring the safety and reliability of the raising of the boom structure.

Description

boom assembly and construction machinery

[0001] Cross-references to related applications

[0002] This application claims the benefit of Chinese Patent Application No. 202510024152.3, filed on January 7, 2025, the contents of which are incorporated herein by reference. Technical Field

[0003] This application belongs to the field of engineering machinery technology, and in particular relates to a boom device and engineering machinery. Background Technology

[0004] Currently, in the boom-raising operation of construction machinery such as truck cranes, the boom's change from the horizontal zero position to the corresponding boom-raising angle is usually achieved through the thrust of the luffing cylinder located directly below the boom structure.

[0005] As the tonnage of newly developed truck cranes continues to break through, the larger the crane's tonnage, the greater the thrust requirement of the luffing cylinders during boom raising. Especially during the jib raising operation, a single or two luffing cylinders are generally insufficient to meet the thrust requirements, significantly impacting operational safety and reliability. Summary of the Invention

[0006] The main purpose of this application is to propose a boom device and engineering machinery, which aims to solve the technical problem of poor safety and reliability of boom lifting in the prior art.

[0007] To achieve the above objectives, this application provides a boom device, comprising: a boom structure, the first end of which is hinged to a first hinge point of a turntable; a luffing cylinder, the first end of which is hinged to a second hinge point of the turntable, and the second end of which is hinged to a third hinge point of the boom structure; and an auxiliary cylinder, the first end of which is hinged to a fourth hinge point of the turntable, and the second end of which is hinged to a fifth hinge point of the boom structure. The luffing cylinder and the auxiliary cylinder are used to synchronously drive the boom structure to raise the boom. The fourth hinge point is located between the first hinge point and the second end of the boom structure, and the fourth hinge point is disposed close to the first hinge point.

[0008] Optionally, the boom assembly further includes: a loading and unloading pin mechanism, comprising a power pin and a pin drive member connected to the power pin, wherein the auxiliary cylinder is hinged to the fifth hinge point via the power pin, and the pin drive member is used to drive the power pin to move along the axial direction of the power pin and to disengage or hinge the power pin from the boom structure.

[0009] Optionally, the boom assembly further includes a controller electrically connected to the pin drive member, the controller being configured to: determine that the auxiliary cylinder is in a disengaged state, and control the pin drive member to move in the reverse direction until the power pin disengages from the boom structure; determine that the auxiliary cylinder is in a engaged state, and control the pin drive member to move in the forward direction until the power pin hinges to the boom structure.

[0010] Optionally, the boom assembly further includes a suspension mechanism, one end of which is hinged to the auxiliary cylinder and the other end of which is hinged to the sixth hinge point of the boom structure. The suspension mechanism is used to drive the auxiliary cylinder to move away from or towards the boom structure in the vertical direction.

[0011] Optionally, the suspension mechanism and the controller are electrically connected, and the controller is further configured to: determine that the power pin is disengaged from the boom structure, control the suspension mechanism to drive the auxiliary cylinder to move until the auxiliary cylinder moves to a clearance position, and a clearance gap is formed between the auxiliary cylinder and the boom structure in the clearance position; determine that the boom structure returns to a preset pin position, control the suspension mechanism to drive the auxiliary cylinder to move until the auxiliary cylinder moves to an auxiliary pin position, and the center of the pin hole of the auxiliary cylinder in the auxiliary pin position coincides with the fifth hinge point.

[0012] Optionally, the suspension mechanism includes: a telescopic component, one end of which is hinged to the sixth hinge point; a folding component, one end of which is hinged to the cylinder body of the auxiliary cylinder, the other end of the telescopic component being hinged to the other end of the folding component, the controller being electrically connected to the telescopic component, and the controller being used to control the telescopic movement of the telescopic component.

[0013] Optionally, the telescopic assembly includes a connecting outer plate and a telescopic inner rod sleeved within the connecting outer plate. The telescopic inner rod is used to extend and retract relative to the connecting outer plate under the control of the controller. The connecting outer plate is hinged to the folding assembly, and the telescopic inner rod is hinged to the boom structure. And / or, the folding assembly includes at least two folding pull plates, and two adjacent folding pull plates are connected by folding waist holes.

[0014] Optionally, the boom device includes: an angle detection component for detecting the current luffing angle of the luffing cylinder and the auxiliary cylinder; a pressure detection component for detecting the current pressure of the luffing cylinder and the auxiliary cylinder; both the angle detection component and the pressure detection component are electrically connected to the controller; the controller is further configured to: control the extension length of the luffing cylinder and the auxiliary cylinder according to the current luffing angle, so that the luffing cylinder and the auxiliary cylinder luff at the same angle.

[0015] Optionally, the boom assembly further includes a distance detection element electrically connected to the controller, the distance detection element being used to detect the pin distance between the pin hole of the auxiliary cylinder and the fifth hinge point; the controller is further configured to determine the operating condition of the auxiliary cylinder based on the current luffing angle, the current pressure, and the pin distance.

[0016] Optionally, the auxiliary hydraulic cylinders are provided on both sides of the boom structure along the vehicle width direction; and / or, the fifth hinge point is located on the lower side of the boom structure.

[0017] Optionally, the first hinge point, the second hinge point, the fourth hinge point, the fifth hinge point, and the third hinge point are arranged sequentially along the arm length direction of the boom structure.

[0018] This application also proposes an engineering machine that includes the boom device described above.

[0019] Through the above technical solutions, the boom device provided in this application embodiment has the following beneficial effects:

[0020] When using a boom assembly for boom raising, the luffing cylinder's body is hinged to the turntable, and its piston rod is hinged to the boom structure. Similarly, the auxiliary cylinder's body is hinged to the turntable, and its piston rod is also hinged to the boom structure. The luffing cylinder acts as the main cylinder, while the auxiliary cylinder assists it. Both cylinders synchronously drive the boom structure to raise the boom. This design addresses the issue of existing cylinders not providing sufficient thrust for self-raising during boom raising. The addition of an auxiliary cylinder increases thrust, compensating for the insufficient thrust of existing cylinders and enabling self-raising of the boom. Furthermore, in this embodiment, both the luffing cylinder and the auxiliary cylinder are hinged to the turntable. Compared to other locations, this ensures the turntable's support strength for the luffing cylinder and auxiliary cylinder, improving the boom structure's raising stability. In this application, by installing a luffing cylinder and an auxiliary cylinder on a turntable, and by supporting the luffing cylinder and the auxiliary cylinder on the turntable, the luffing cylinder and the auxiliary cylinder can work together to drive the boom structure to lift the boom. This avoids insufficient boom thrust while ensuring support strength, thus ensuring the safety and reliability of the boom structure when lifting the boom.

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

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

[0023] Figure 1 is a structural schematic diagram of the boom device in one state according to an embodiment of the present application;

[0024] Figure 2 is a structural schematic diagram of the boom device in another state according to one embodiment of the present application;

[0025] Figure 3 is a structural schematic diagram of the boom device in another state according to an embodiment of the present application;

[0026] Figure 4 is an enlarged schematic diagram of part of the structure in Figure 3;

[0027] Figure 5 is a partial structural schematic diagram of the boom device according to another embodiment of this application;

[0028] Figure 6 is a schematic diagram of the telescopic component structure of the boom device according to an embodiment of the present application;

[0029] Figure 7 is a schematic diagram of the folding assembly structure of the boom device according to an embodiment of this application.

[0030] Figure Labeling Explanation: 1. Boom Structure; 5. Power Pin; 11. Third Hinge Point; 6. Suspension Mechanism; 12. Fifth Hinge Point; 61. Telescopic Assembly; 13. Sixth Hinge Point; 611. Connecting Outer Plate; 14. Luffing Support; 612. Telescopic Inner Rod; 15. Auxiliary Support; 62. Folding Assembly; 16. Pull Plate Support; 621. Folding Pull Plate; 2. Turntable; 622. Folding Waist Hole; 21. First Hinge Point; 7. Angle Sensor; 22. Second Hinge Point; 8. Pressure Sensor; 23. Fourth Hinge Point; 9. Distance Sensor; 3. Luffing Cylinder; 100. Construction Machinery; 4. Auxiliary Cylinder; 110. Chassis. Detailed Implementation

[0031] The specific embodiments of this application 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 scope of this application.

[0032] The boom assembly according to this application is described below with reference to the accompanying drawings.

[0033] As shown in Figures 1 to 7, in the embodiments of this application, the boom device includes a boom structure 1, a luffing cylinder 3, and an auxiliary cylinder 4. The boom structure 1 has its first end hinged to a first hinge point 21 of a turntable 2. The luffing cylinder 3 has its first end hinged to a second hinge point 22 of the turntable 2 and its second end hinged to a third hinge point 11 of the boom structure 1. The auxiliary cylinder 4 has its first end hinged to a fourth hinge point 23 of the turntable 2 and its second end hinged to a fifth hinge point 12 of the boom structure 1. The luffing cylinder 3 and the auxiliary cylinder 4 are used to synchronously drive the boom structure 1 to raise the boom. The fourth hinge point 23 is located between the first hinge point 21 and the second end of the boom structure 1, and the fourth hinge point 23 is set close to the first hinge point 21.

[0034] The boom structure 1 may include a basic boom and a telescopic boom that are telescopically connected to the basic boom. The front end of the basic boom may be hinged to the turntable 2. The luffing cylinder 3 and the auxiliary cylinder 4 may both be hinged to the basic boom of the boom structure 1. The boom device in this embodiment is mainly used in construction machinery 100 such as truck cranes.

[0035] Understandably, in this embodiment, the boom structure 1 can be equipped with a luffing support 14 and an auxiliary support 15. The luffing cylinder 3 can be hinged to the third hinge point 11 of the boom structure 1 via the luffing support 14, and the auxiliary cylinder 4 can be hinged to the fifth hinge point 12 of the boom structure 1 via the auxiliary support 15. The boom structure 1 can be hinged to the turntable 2 via a pin structure, and the two ends of the luffing cylinder 3 can be hinged to the turntable 2 and the boom structure 1 respectively via a pin structure. In Figure 1, the boom structure 1 is in the zero position, and the top surface of the boom structure 1 is higher than the top of the luffing cylinder 3 and the auxiliary cylinder 4, which can make full use of the installation space between the boom structure 1 and the turntable 2. In Figure 2, the boom structure 1 is in the boom-raised position and the auxiliary cylinder 4 is working. In Figure 3, the boom structure 1 is in another boom-raised position and the auxiliary cylinder 4 is detached from the boom structure 1. It should be noted that the first hinge point 21, the second hinge point 22, and the fourth hinge point 23 can be sequentially arranged on the turntable 2 in the vertical direction. The thrust of the auxiliary cylinder 4 is less than that of the luffing cylinder 3, and the stroke of the auxiliary cylinder 4 is less than that of the luffing cylinder 3. Specifically, the thrust of the auxiliary cylinder 4 is determined by subtracting the thrust of the luffing cylinder 3 from the thrust required for boom lifting on the boom structure 1. The stroke of the auxiliary cylinder 4 is determined by the distance between the auxiliary support 15 on the boom structure 1 and the second hinge point 22 and the fourth hinge point 23 mounted on the turntable 2. The first and second ends of the boom structure 1 are located at the front and rear ends respectively. The front end is hinged to the turntable 2. The front ends of both the luffing cylinder 3 and the auxiliary cylinder 4 are hinged to the turntable 2, and the rear ends of both the luffing cylinder 3 and the auxiliary cylinder 4 are hinged to the main boom. Turntable 2 is located at the front end of the basic arm, and the second hinge point 22 and the fourth hinge point 23 are both located near the front end of the basic arm. Luffing cylinder 3 and auxiliary cylinder 4 are both located at the rear end of turntable 2. While ensuring the support strength of turntable 2 for auxiliary cylinder 4, the position of auxiliary cylinder 4 is set further back, so that the auxiliary luffing angle is larger when the cylinder stroke of auxiliary cylinder 4 is the same.

[0036] When using the boom assembly in this embodiment for boom raising, the luffing cylinder 3's cylinder body is hinged to the turntable 2, and its piston rod is hinged to the boom structure 1. The auxiliary cylinder 4's cylinder body is also hinged to the turntable 2, and its piston rod is hinged to the boom structure 1. The luffing cylinder 3 serves as the main cylinder, and the auxiliary cylinder 4 assists the main cylinder. The two cylinders can synchronously drive the boom structure 1 to raise the boom. This design addresses the issue that the thrust of existing cylinders is insufficient for self-raising during boom raising operations. The addition of the auxiliary cylinder 4 increases thrust, compensating for the insufficient thrust of existing cylinders and enabling self-raising of the boom. Furthermore, in this embodiment, both the luffing cylinder 3 and the auxiliary cylinder 4 are hinged to the turntable 2. Compared to other locations, this ensures the support strength of the turntable 2 for the luffing cylinder 3 and the auxiliary cylinder 4, improving the boom raising stability of the boom structure 1. Furthermore, the auxiliary cylinder 4 is hinged to the fourth hinge point 23 of the turntable 2, and the fourth hinge point 23 is located between the first hinge point 21 and the second end of the boom structure 1. This allows the auxiliary cylinder 4 to be positioned further back, achieving a smaller cylinder extension / retraction stroke, thus enabling the boom to be controlled to luff at a large angle. In this embodiment, by installing the luffing cylinder 3 and the auxiliary cylinder 4 on the turntable 2, and supporting the luffing cylinder 3 and the auxiliary cylinder 4 through the turntable 2, the luffing cylinder 3 and the auxiliary cylinder 4 can work together to drive the boom structure 1 to raise the boom. This avoids insufficient boom thrust while ensuring support strength, thus ensuring the safety and reliability of the boom structure 1 when raising the boom.

[0037] In this embodiment, the auxiliary cylinder 4 is arranged below the basic boom, which does not occupy the space on the boom structure 1. The arrangement space is more reasonable, which can avoid the situation that the height of the auxiliary cylinder 4 is too high and will affect the overall vehicle size. At the same time, it can also avoid the center of gravity from becoming too high and affecting the stability of the vehicle.

[0038] In one embodiment, the boom assembly further includes a loading and unloading pin mechanism, which includes a power pin 5 and a pin drive connected to the power pin 5. The auxiliary cylinder 4 is hinged to the fifth hinge point 12 via the power pin 5. The pin drive is used to drive the power pin 5 to move axially along the power pin 5 and to disengage or hinge the power pin 5 from the boom structure 1. The pin drive can drive the power pin 5 to reciprocate along its own axis, thereby realizing the disassembly and assembly of the power pin 5, avoiding manual disassembly and assembly of the power pin 5, and improving the efficiency of disassembly and assembly of the power pin 5. When the auxiliary cylinder 4 reaches its maximum extension stroke, or when it is not necessary to use the auxiliary cylinder 4 to assist in boom lifting, the pin drive can drive the power pin 5 to disengage from the pin, causing the piston rod of the auxiliary cylinder 4 to disengage from the boom structure 1. When the auxiliary cylinder 4 is needed to assist in boom lifting or to reset, the pin drive can drive the power pin 5 to pass through the pin, causing the piston rod of the auxiliary cylinder 4 to engage with the boom structure 1.

[0039] Specifically, the boom assembly also includes a controller, the loading and unloading pin mechanism includes a power pin 5 and a pin drive for driving the power pin 5, and an auxiliary cylinder 4 is used to hinge to the fifth hinge point 12 via the power pin 5; the controller and the pin drive are electrically connected.

[0040] The controller is configured as follows:

[0041] Once the auxiliary cylinder 4 is confirmed to be in the disengaged pin condition, control the pin drive component to move in the reverse direction until the power pin 5 disengages from the boom structure 1.

[0042] Determine that the auxiliary cylinder 4 is in the pin-operated state, control the pin drive component to move forward until the power pin 5 connects to the articulated boom structure 1.

[0043] In this embodiment, the pin drive component can be a hydraulic cylinder structure. The pin drive component is electrically connected to the controller. Under the control of the controller, the pin drive component can drive the power pin 5 to reciprocate along its own axis, thereby realizing the assembly and disassembly of the power pin 5.

[0044] Specifically, in this embodiment, the stroke of the auxiliary cylinder 4 is shorter than that of the luffing cylinder 3, which can reduce the overall cost of the boom device. When the boom structure 1 raises the boom to the preset release pin angle, there is no need for the auxiliary cylinder 4 to assist in raising the boom. It can be determined that the auxiliary cylinder 4 is in the release pin condition. The controller can send a release pin signal to the pin drive component. The pin drive component can drive the power pin 5 along the release pin direction until the power pin 5 disengages from the boom structure 1, so that the piston rod of the auxiliary cylinder 4 disengages from the main boom, and the luffing cylinder 3 can independently perform luffing operations.

[0045] After the boom structure 1 completes the luffing operation, the luffing cylinder 3 can drive the boom structure 1 to retract and return to its original position. When the boom structure 1 returns to the preset pin angle and the pin hole of the auxiliary cylinder 4 is aligned with the fifth hinge point 12, it can be determined that the auxiliary cylinder 4 is in the pin-locking condition. The controller can send a pin-locking signal to the pin drive component, which can drive the power pin 5 in the pin-removing direction. The pin-removing direction is opposite to the pin-locking direction until the power pin 5 returns to the hinged position, so that the piston rod of the auxiliary cylinder 4 and the basic boom are hinged through the power pin 5.

[0046] In this embodiment, the auxiliary cylinder 4 and the basic boom are hinged together by a loading and unloading pin mechanism. This allows the auxiliary cylinder 4 to be self-disassembled during boom raising and lowering of the boom structure 1. When the boom structure 1 expands to the preset release pin angle, it avoids the need for manual disassembly due to the limited stroke of the auxiliary cylinder 4, and also avoids the auxiliary cylinder 4 restricting the boom structure 1's amplitude. When the boom structure 1 is lowered to the preset pin insertion angle, and the pin hole of the auxiliary cylinder 4 aligns with the fifth hinge point 12, the loading and unloading pin mechanism re-hinges the piston rod of the auxiliary cylinder 4 and the basic boom, facilitating subsequent boom raising operations and greatly improving the ease of boom raising of the boom structure 1. The preset release pin angle and the preset pin insertion angle can be the same or the preset pin insertion angle can be smaller than the preset release pin angle. In other embodiments, the pin drive can also adopt other drive structure forms.

[0047] It should be noted that the boom assembly also includes a suspension mechanism 6. One end of the suspension mechanism 6 is hinged to the auxiliary cylinder 4, and the other end is hinged to the sixth hinge point 13 of the boom structure 1. The suspension mechanism 6 is used to drive the auxiliary cylinder 4 to move away from or towards the boom structure 1 in the vertical direction. When the piston rod of the auxiliary cylinder 4 is disengaged from the boom structure 1, the suspension mechanism 6 can suspend the auxiliary cylinder 4 below the boom structure 1, thus preventing the auxiliary cylinder 4 from disengaging from the boom structure 1. At the same time, the suspension mechanism 6 can drive the auxiliary cylinder 4 to move away from or towards the boom structure 1 in the vertical direction. During the boom structure 1's luffing process, when the piston rod of the auxiliary cylinder 4 disengages from the boom structure 1, the suspension mechanism 6 can drive the auxiliary cylinder 4 away from the boom structure 1 to avoid interfering with the boom structure 1 or other components. When the auxiliary cylinder 4 needs to assist in boom raising or reset, the suspension mechanism 6 can drive the auxiliary cylinder 4 closer to the boom structure 1 until the pin hole on the piston rod of the auxiliary cylinder 4 aligns with the fifth hinge point 12 on the boom structure 1. The pin drive component then drives the power pin 5 to move along its own axis, thus achieving pin insertion of the power pin 5. In this embodiment, the suspension mechanism 6 enables the auxiliary cylinder 4 to automatically align with the boom structure 1. Simultaneously, it can suspend the auxiliary cylinder 4 even when it is not assisting in boom raising, preventing displacement and facilitating subsequent connection and reset of the auxiliary cylinder 4.

[0048] Specifically, the suspension mechanism 6 is electrically connected to the controller, which is further configured as follows:

[0049] Once the power pin 5 is disengaged from the boom structure 1, the suspension mechanism 6 is controlled to drive the auxiliary cylinder 4 to move until the auxiliary cylinder 4 moves to the avoidance position, and an avoidance gap is formed between the auxiliary cylinder 4 in the avoidance position and the boom structure 1.

[0050] Once the boom structure 1 is positioned at the preset pin position, the suspension mechanism 6 is controlled to drive the auxiliary cylinder 4 to move until the auxiliary cylinder 4 moves to the auxiliary pin position, at which point the center of the pin hole of the auxiliary cylinder 4 in the auxiliary pin position coincides with the fifth hinge point 12.

[0051] In this embodiment, the boom structure 1 may also be provided with a pull plate support 16, and the suspension mechanism 6 can be hinged to the sixth hinge point 13 of the boom structure 1 through the pull plate support 16.

[0052] When the boom structure 1 raises the boom to the preset release pin angle, there is no need for the auxiliary cylinder 4 to assist in raising the boom. It can be determined that the auxiliary cylinder 4 is in the release pin condition. The controller can send a release pin signal to the pin drive component. The pin drive component can drive the power pin 5 along the release pin direction until the power pin 5 disengages from the boom structure 1. When it is determined that the power pin 5 disengages from the boom structure 1, the controller can send a folding signal to the suspension mechanism 6. The cylinder body of the auxiliary cylinder 4 and the suspension mechanism 6 are hinged. The suspension mechanism 6 can drive the auxiliary cylinder 4 to move downward to the avoidance position, so that an avoidance gap is formed between the auxiliary cylinder 4 in the avoidance position and the boom structure 1, so as to avoid the auxiliary cylinder 4 from interfering with other components. The auxiliary cylinder 4 is suspended below the basic boom by the suspension mechanism 6.

[0053] After the boom structure 1 completes the luffing operation, the luffing cylinder 3 can drive the boom structure 1 to retract and return to its original position. When the boom structure 1 returns to the preset pin position, the controller can send a return signal to the suspension mechanism 6, causing the suspension mechanism 6 to drive the auxiliary cylinder 4 to return to the pin position. The center of the pin hole of the auxiliary cylinder 4 in the pin position and the fifth hinge point 12 are coaxially coincident. The controller can determine that the auxiliary cylinder 4 is in the pin-locking condition. The controller can send a pin-locking signal to the pin drive component. The pin drive component can drive the power pin 5 in the pin-removing direction, which is opposite to the pin-locking direction, until the power pin 5 returns to the hinge position, so that the piston rod of the auxiliary cylinder 4 and the basic boom are hinged through the power pin 5.

[0054] As shown in Figures 6 and 7, the suspension mechanism 6 includes a telescopic component 61 and a folding component 62. One end of the telescopic component 61 is hinged to a sixth hinge point 13. One end of the folding component 62 is hinged to the cylinder body of the auxiliary hydraulic cylinder 4, and the other end of the telescopic component 61 is hinged to the other end of the folding component 62. A controller is electrically connected to the telescopic component 61 and controls its telescopic movement. In this embodiment, the suspension mechanism 6 may include a telescopic component 61 located at the upper end and a folding component 62 hinged to it. The telescopic component 61 can telescopically move along its own length. During the rotation of the boom structure 1, the folding component 62 can fold or unfold along its own length under the action of the auxiliary hydraulic cylinder 4. The controller is electrically connected to the telescopic component 61, which may employ a hydraulic cylinder structure or other drive mechanisms.

[0055] The controller sends a folding signal to the telescopic component 61, which extends along its length to increase its length and autonomously avoid obstacles. As the angle of the boom structure 1 continues to increase, the folding component 62, which is in a folded state with the auxiliary cylinder 4, can unfold under the gravity of the auxiliary cylinder 4, allowing the auxiliary cylinder 4 to avoid obstacles from the boom structure 1. When the controller sends a return signal to the telescopic component 61, the telescopic component 61 retracts along its length, shortening its length and reducing the distance between the boom structure 1 and the auxiliary cylinder 4. At the same time, the boom structure 1 moves downward, and the two ends of the folding component 62 are subjected to the reaction forces between the retraction component and the luffing cylinder 3, respectively, enabling it to fold autonomously and further reduce the distance between the auxiliary cylinder 4 and the boom structure 1. In this embodiment, a telescopic component 61 is provided at the upper end of the suspension mechanism 6, and a folding component 62 is provided at the lower end. The telescopic component 61 and the folding component 62 are hinged together. The telescopic component 61 can rotate relative to the folding component 62, making the retraction of the suspension mechanism 6 smoother. The two variable length structures allow for a large adjustment range of the gap between the auxiliary cylinder 4 and the boom structure 1, avoiding interference between the auxiliary cylinder 4 and other components.

[0056] Specifically, the telescopic assembly 61 includes a connecting outer plate 611 and a telescopic inner rod 612 sleeved within the connecting outer plate 611. The telescopic inner rod 612 is used to extend and retract relative to the connecting outer plate 611 under the control of the controller. The connecting outer plate 611 is hinged to the folding assembly 62, and the telescopic inner rod 612 is hinged to the boom structure 1. As shown in Figure 6, in this embodiment, the telescopic assembly 61 adopts a hydraulic cylinder structure. The end of the telescopic inner rod 612 away from the folding assembly 62 is hinged to the basic arm. The end of the connecting outer plate 611 away from the folding assembly 62 is a hollow cylindrical structure, and the end of the connecting outer plate 611 near the folding assembly 62 is a plate-like structure, which facilitates the hinge between the telescopic assembly 61 and the folding assembly 62. Furthermore, the folding assembly 62 includes at least two folding pull plates 621, and two adjacent folding pull plates 621 are connected by folding waist holes 622. As shown in Figure 7, in one embodiment, there are two folding pull plates 621. One of the folding pull plates 621 is provided with a folding waist hole 622. The two folding pull plates 621 are connected by a pin structure, which can slide along the folding waist hole 622, allowing the two folding pull plates 621 to be folded or unfolded relative to each other. In this embodiment, the folding pull plate 621 is a flat plate structure, which is simple in structure and easy to connect. In other embodiments, the number of folding pull plates 621 can be set according to actual usage requirements, and this application does not limit it.

[0057] In one embodiment, the boom device includes an angle detection component and a pressure detection component. The angle detection component is used to detect the current luffing angle of the luffing cylinder 3 and the auxiliary cylinder 4; the pressure detection component is used to detect the current pressure of the luffing cylinder 3 and the auxiliary cylinder 4; both the angle detection component and the pressure detection component are electrically connected to the controller.

[0058] The controller is further configured as follows:

[0059] The extension lengths of the luffing cylinder 3 and the auxiliary cylinder 4 are controlled according to the current luffing angle, so that the luffing cylinder 3 and the auxiliary cylinder 4 luff at the same angle.

[0060] Specifically, the angle detection component may include at least two angle sensors 7, and angle sensors 7 may be installed on the cylinder bodies of both the luffing cylinder 3 and the auxiliary cylinder 4. The pressure detection component may include at least two pressure sensors 8, and pressure sensors 8 may be installed on the cylinder bodies of both the luffing cylinder 3 and the auxiliary cylinder 4. An angle sensor 7 electrically connected to the controller may also be installed on the boom structure 1 to monitor the boom lifting angle of the boom structure 1.

[0061] In one embodiment, the controller can receive the current luffing angle of the luffing cylinder 3 and the auxiliary cylinder 4 detected by the angle detection component, and adjust the extension length of the luffing cylinder 3 and the auxiliary cylinder 4 according to the current luffing angle so that the current luffing angle of the luffing cylinder 3 and the auxiliary cylinder 4 are consistent.

[0062] In another embodiment, the controller can receive the current luffing angle of the luffing cylinder 3 and the auxiliary cylinder 4 detected by the angle detection component, and at the same time, the controller can receive the current pressure of the luffing cylinder 3 and the auxiliary cylinder 4 detected by the pressure detection component. By combining the angle and the monitoring, the controller controls the luffing length of the luffing cylinder 3 and the auxiliary cylinder 4, so that the luffing cylinder 3 and the auxiliary cylinder 4 luff synchronously, thereby ensuring the stability, safety and reliability of the operation.

[0063] In another embodiment, the boom assembly further includes a distance detection element electrically connected to the controller, the distance detection element being used to detect the pin distance between the pin hole of the auxiliary cylinder 4 and the fifth hinge point 12;

[0064] The controller is further configured as follows:

[0065] The operating condition of auxiliary cylinder 4 is determined based on the current amplitude angle, current pressure, and pin distance.

[0066] In this embodiment, the distance detection component can be a distance sensor 9. Multiple distance sensors 9 can be used, and each distance sensor 9 is positioned at the end of the piston rod of the auxiliary cylinder 4 furthest from the turntable 2. In this embodiment, the distance sensor 9 is positioned close to the pin hole of the auxiliary cylinder 4, which improves the detection accuracy of the distance sensor 9. In this embodiment, with the cooperation of the angle sensor 7, pressure sensor 8, and distance sensor 9, the controller can control the suspension mechanism 6 and the loading / unloading pin mechanism to complete the precise automatic separation and installation of the auxiliary cylinder 4 and the basic arm. The entire process is automatically controlled, avoiding manual disassembly and assembly for each operation and improving work efficiency.

[0067] The controller can determine whether the auxiliary cylinder 4 is in the pin-off condition by combining the current luffing angle of the luffing cylinder 3 and the auxiliary cylinder 4, the current pressure of the luffing cylinder 3 and the auxiliary cylinder 4, and the pin distance, to ensure that the pin-off condition is met simultaneously. By combining these three conditions, the controller can avoid accidental pin-off and improve operational safety.

[0068] As shown in Figure 4, in one embodiment, auxiliary hydraulic cylinders 4 are provided on both sides of the boom structure 1 along the vehicle width direction; and the fifth hinge point 12 is located on the lower side of the boom structure 1. In this embodiment, luffing cylinders 3 are symmetrically arranged on both sides of the main boom, and auxiliary supports 15 are arranged directly below the main boom. In other embodiments, the number and position of luffing supports 14 and auxiliary hydraulic cylinders 4 can be adjusted comprehensively based on the arrangement of luffing cylinders 3, the thrust requirements of the boom, the working capacity of the cylinders, and the structural characteristics of the turntable 2 and the main boom.

[0069] In one embodiment, a luffing cylinder 3 is arranged directly below the main boom, and an auxiliary cylinder 4 may also be arranged directly below the main boom. In another embodiment, a luffing cylinder 3 is arranged directly below the main boom, and two auxiliary cylinders 4 are symmetrically arranged on both sides of the main boom. In yet another embodiment, while a luffing cylinder 3 is arranged directly below the main boom, two auxiliary cylinders 4 are symmetrically arranged on both sides of the main boom, and an auxiliary cylinder 4 is also arranged directly below the main boom. The number of luffing cylinders 3 and auxiliary cylinders 4 in this application can be adjusted according to requirements.

[0070] It should be noted that the first hinge point 21, the second hinge point 22, the fourth hinge point 23, the fifth hinge point 12, and the third hinge point 11 are arranged sequentially along the boom length direction of the boom structure 1. The fifth hinge point 12 can be located between the sixth hinge point 13 and the third hinge point 11 along the boom length direction of the basic boom. In this embodiment, both the luffing cylinder 3 and the auxiliary cylinder 4 are hinged to the rear end of the turntable 2. The first hinge point 21, the second hinge point 22, the fourth hinge point 23, the sixth hinge point 13, the fifth hinge point 12, and the third hinge point 11 are arranged sequentially at intervals along the front and rear. The mounting point of the auxiliary cylinder 4 is located behind the luffing cylinder 3, ensuring the luffing angle of the auxiliary cylinder 4. Furthermore, the first hinge point 21, the second hinge point 22, and the fourth hinge point 23 are arranged sequentially in the vertical direction, so that the luffing cylinder 3 and the auxiliary cylinder 4 are located below the basic arm, which can make full use of the installation space between the turntable 2 and the basic arm. The height of the third hinge point 11 is higher than the height of the fifth hinge point 12, which can facilitate the installation of the auxiliary cylinder 4 while ensuring the auxiliary lifting of the auxiliary cylinder 4.

[0071] This application also proposes an engineering machinery 100, which includes a chassis 110 and a boom device as described above. The specific structure of the boom device is as described in the above embodiments. A turntable 2 is mounted on the upper side of the chassis 110, and multiple wheels are provided on the lower side of the chassis 110. Since the engineering machinery 100 adopts all the technical solutions of all 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. In one embodiment, the engineering vehicle can be used as a crane.

[0072] In one embodiment, the boom structure 1 starts to lift the boom from the zero position, the luffing cylinder 3 starts to luff, the lower end of the auxiliary cylinder 4 is hinged to the turntable 2, and the upper end of the auxiliary cylinder 4 is connected to the auxiliary support 15 on the basic boom through the installed power pin 5 to generate auxiliary thrust. Under the detection of the angle sensor 7 and the pressure sensor 8, the controller controls the auxiliary cylinder 4 and the luffing cylinder 3 to complete the synchronous boom lifting.

[0073] As shown in Figure 2, when the boom structure 1 raises the boom to the preset release pin angle, the stroke of the auxiliary cylinder 4 is shorter than that of the luffing cylinder 3. Based on the data detected by the pressure sensor 8 and the angle sensor 7, the controller determines that the luffing cylinder 3 can independently complete the remaining luffing work, and the controller can control the auxiliary cylinder 4 to separate from the boom structure 1.

[0074] The specific separation process is as follows: The controller combines the angle data and pressure data detected by the angle sensor 7 and the pressure sensor 8 to determine the angle at which the boom structure 1 lifts the boom to the preset pin release angle. The controller controls the pin drive component to drive the power pin 5 to automatically pull out the pin, and the auxiliary cylinder 4 separates from the auxiliary support 15. After separation, the auxiliary cylinder 4 is suspended below the basic boom through the suspension mechanism 6.

[0075] After boom structure 1 completes the boom raising operation and begins retraction, the controller, combining signals detected by angle sensor 7, pressure sensor 8, and distance sensor 9, determines that the luffing cylinder 3 and boom structure 1 have returned to the separation position of auxiliary cylinder 4. The controller then controls the suspension mechanism 6 to automatically extend and retract, adjusting the pin hole position of auxiliary cylinder 4 so that the pin hole of auxiliary cylinder 4 coincides with the pin hole of auxiliary support 15. When the signal from distance sensor 9 indicates that the pin hole of auxiliary cylinder 4 and the pin hole of auxiliary support 15 are coaxially aligned, the controller issues a command to automatically insert the pin, reconnecting auxiliary cylinder 4 and auxiliary support 15. Then, under the monitoring of angle sensor 7 and pressure sensor 8, the controller controls auxiliary cylinder 4 and luffing cylinder 3 to complete the boom structure 1 retraction operation. After boom structure 1 is retracted, the controller controls the suspension mechanism 6 to retract, automatically folding the suspension mechanism 6 under the main boom to avoid interference between the suspension mechanism 6 and other components.

[0076] In the description of this application, 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 technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0077] In this application, unless otherwise expressly 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 components; 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 expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0078] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. 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.

[0079] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A boom device, wherein, The boom assembly includes: The boom structure (1) has its first end hinged to the first hinge point (21) of the turntable (2); The luffing cylinder (3) has its first end hinged to the second hinge point (22) of the turntable (2) and its second end hinged to the third hinge point (11) of the boom structure (1). The auxiliary cylinder (4) has its first end hinged to the fourth hinge point (23) of the turntable (2) and its second end hinged to the fifth hinge point (12) of the boom structure (1). The luffing cylinder (3) and the auxiliary cylinder (4) are used to synchronously drive the boom structure (1) to raise the boom. The fourth hinge point (23) is located between the first hinge point (21) and the second end of the boom structure (1), and the fourth hinge point (23) is set close to the first hinge point (21).

2. The boom assembly according to claim 1, wherein, The boom assembly also includes: The loading and unloading pin mechanism includes a power pin (5) and a pin drive connected to the power pin (5). The auxiliary cylinder (4) is hinged to the fifth hinge point (12) via the power pin (5). The pin drive is used to drive the power pin (5) to move along the axial direction of the power pin (5) and to disengage or hinge the power pin (5) from the boom structure (1).

3. The boom assembly according to claim 2, wherein, The boom assembly also includes a controller electrically connected to the pin drive, the controller being configured to: Once the auxiliary cylinder (4) is determined to be in the disengaged state, the pin drive component is controlled to move in the reverse direction until the power pin (5) disengages from the boom structure (1); Determine that the auxiliary cylinder (4) is in the pin working condition, control the pin drive to move forward until the power pin (5) hinges the boom structure (1).

4. The boom assembly according to claim 2, wherein, The boom device also includes a suspension mechanism (6), one end of which is hinged to the auxiliary cylinder (4) and the other end is hinged to the sixth hinge point (13) of the boom structure (1). The suspension mechanism (6) is used to drive the auxiliary cylinder (4) to move away from or closer to the boom structure (1) in the vertical direction.

5. The boom assembly according to claim 4, wherein, The suspension mechanism (6) is electrically connected to the controller, which is further configured to: Once the power pin (5) is disengaged from the boom structure (1), the suspension mechanism (6) is controlled to drive the auxiliary cylinder (4) to move until the auxiliary cylinder (4) moves to the avoidance position, and an avoidance gap is formed between the auxiliary cylinder (4) and the boom structure (1) in the avoidance position. Once the boom structure (1) is positioned at the preset pin position, the suspension mechanism (6) is controlled to drive the auxiliary cylinder (4) to move until the auxiliary cylinder (4) moves to the auxiliary pin position, and the center of the pin hole of the auxiliary cylinder (4) at the auxiliary pin position coincides with the fifth hinge point (12).

6. The boom assembly according to claim 5, wherein, The suspension mechanism (6) includes: Telescopic component (61), one end of which is hinged to the sixth hinge point (13); The folding assembly (62) is hinged at one end to the cylinder body of the auxiliary cylinder (4), and the telescopic assembly (61) is hinged at the other end to the other end of the folding assembly (62). The controller is electrically connected to the telescopic assembly (61) and the controller is used to control the telescopic movement of the telescopic assembly (61).

7. The boom assembly according to claim 6, wherein, The telescopic assembly (61) includes a connecting outer plate (611) and a telescopic inner rod (612) sleeved inside the connecting outer plate (611). The telescopic inner rod (612) is used to extend and retract relative to the connecting outer plate (611) under the control of the controller. The connecting outer plate (611) and the folding assembly (62) are hinged together, and the telescopic inner rod (612) and the boom structure (1) are hinged together. And / or, The folding assembly (62) includes at least two folding pull plates (621), and two adjacent folding pull plates (621) are connected by folding waist holes (622).

8. The boom assembly according to any one of claims 3 to 7, wherein, The boom assembly includes: An angle detection component is used to detect the current luffing angle of the luffing cylinder (3) and the auxiliary cylinder (4); A pressure detection component is used to detect the current pressure of the luffing cylinder (3) and the auxiliary cylinder (4); Both the angle detection component and the pressure detection component are electrically connected to the controller. The controller is further configured to: The extension length of the luffing cylinder (3) and the auxiliary cylinder (4) is controlled according to the current luffing angle so that the luffing cylinder (3) and the auxiliary cylinder (4) luff at the same angle.

9. The boom assembly according to claim 8, wherein, The boom device also includes a distance detection device electrically connected to the controller, the distance detection device being used to detect the pin distance between the pin hole of the auxiliary cylinder (4) and the fifth hinge point (12); The controller is further configured to: The operating condition of the auxiliary cylinder (4) is determined based on the current amplitude angle, current pressure, and pin distance.

10. The boom assembly according to any one of claims 1 to 7, wherein, The boom structure (1) is equipped with auxiliary hydraulic cylinders (4) on both sides along the vehicle width direction; And / or, The fifth hinge point (12) is located on the lower side of the boom structure (1).

11. The boom assembly according to any one of claims 1 to 7, wherein, The first hinge point (21), the second hinge point (22), the fourth hinge point (23), the fifth hinge point (12) and the third hinge point (11) are arranged sequentially along the arm length direction of the boom structure (1).

12. An engineering machine (100), wherein, The construction machinery (100) includes the boom device as described in any one of claims 1 to 11.

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