Telescopic device, exhaust method and engineering machine

Abstract

This application relates to a telescopic device, an venting method, and engineering machinery, belonging to the field of engineering machinery technology. The telescopic device includes a hydraulic cylinder, an venting channel, an venting valve, and a boom. The hydraulic cylinder includes a rodless section and a rod section distributed along the length of the hydraulic cylinder. The venting channel is connected to the end of the rodless section away from the rod section. The venting valve is disposed on the venting channel. The boom includes a fixed boom and a telescopic boom. The fixed boom is connected to the piston rod of the hydraulic cylinder, and the telescopic boom is slidably engaged with the fixed boom. The telescopic boom is connected to the cylinder body of the hydraulic cylinder. The telescopic device, venting method, and engineering machinery can improve the problem of incomplete venting of the hydraulic cylinder without causing additional damage to the hydraulic cylinder.

Description

Technical Field

[0001] This application relates to the field of engineering machinery technology, specifically to a telescopic device, an exhaust method, and engineering machinery. Background Technology

[0002] Fire trucks, cranes, and other construction machinery often use telescopic devices, which are typically driven by hydraulic cylinders to lift or retract. To ensure stable operation of the hydraulic cylinders, it's crucial to effectively expel any gases mixed within them. Current technologies often rely on the piston's repeated reciprocating motion throughout its full stroke to carry away the gas with hydraulic oil. However, this method is not only incomplete but also prone to cavitation or explosion problems, damaging the hydraulic cylinder. Summary of the Invention

[0003] To address the aforementioned technical problems, embodiments of this application provide a telescopic device, an exhaust method, and engineering machinery, which can improve the problem of incomplete exhaust of hydraulic cylinders without causing additional damage to the hydraulic cylinders.

[0004] In a first aspect, a telescopic device is provided, comprising: A hydraulic cylinder includes a rodless cavity section and a rod cavity section distributed along the length direction of the hydraulic cylinder; The exhaust passage is connected to the end of the rodless cavity section away from the rod-type cavity section; An exhaust valve is provided on the exhaust passage; The boom includes a fixed boom and a telescopic boom. The fixed boom is connected to the piston rod of the hydraulic cylinder, the telescopic boom is slidably engaged with the fixed boom, and the telescopic boom is connected to the cylinder body of the hydraulic cylinder.

[0005] According to a first aspect of this application, along the Z-axis, the hydraulic cylinder is inverted, and the rodless cavity is located above the rod-type cavity.

[0006] According to a first aspect of this application, the telescopic arm includes multiple sliding frames, which are nested and slidably fitted together in sequence.

[0007] According to a first aspect of this application, the telescopic device further includes: A control component is communicatively connected to the exhaust valve, and the control component is used to control the exhaust valve to open or close.

[0008] According to a first aspect of this application, the control component includes: A cable is connected to the exhaust valve; The receiving module is connected to the cable; The control module is connected to the cable; The sending module is communicatively connected to the receiving module.

[0009] According to a first aspect of this application, the control component further includes: The battery module is electrically connected to the receiving module and the control module.

[0010] According to a first aspect of this application, the cable, the receiving module, the control module, and the battery module are all located inside the telescopic arm.

[0011] Secondly, a venting method is also provided, applied to the telescopic device as described in the previous embodiment, the venting method comprising: Open the exhaust valve; The piston of the hydraulic cylinder is controlled to move, compressing the volume of the rodless chamber to discharge gas from the exhaust passage.

[0012] According to a second aspect of this application, before opening the exhaust valve, the exhaust method further includes: Control the telescopic arm to slide relative to the fixed arm to a preset height; The control of the piston movement of the hydraulic cylinder to compress the volume of the rodless chamber to discharge gas from the exhaust passage includes: The telescopic arm descends under its own weight, causing the piston of the hydraulic cylinder to move and compress the volume of the rodless chamber, thereby expelling the gas from the exhaust channel.

[0013] Thirdly, an engineering machinery is also provided, including: Organism; The telescopic device as described in the previous embodiment is mounted on the body.

[0014] The telescopic device, venting method, and engineering machinery provided in this application embodiment utilize a venting channel at the end of the rodless chamber away from the rod-side chamber. An venting valve is installed within this channel. When gas accumulates in the rodless chamber, the venting valve opens, controlling the piston movement within the hydraulic cylinder to gradually compress the volume of the rodless chamber, allowing the gas to be discharged through the venting channel out of the hydraulic cylinder. In this way, during the venting process, the piston directly acts on the gas accumulated in the rodless chamber, allowing the gas to directly enter the venting channel, effectively reducing the amount of residual gas in the rodless chamber and improving the problem of incomplete venting in related technologies. Furthermore, the venting process eliminates the need for repeated piston reciprocating motion, avoiding cavitation or explosion problems caused by gas accumulation and preventing additional damage to the hydraulic cylinder. Attached Figure Description

[0015] The above and other objects, features, and advantages of this application will become more apparent from the more detailed description of the embodiments of this application in conjunction with the accompanying drawings. The drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the embodiments of this application to explain this application and do not constitute a limitation thereof. In the drawings, the same reference numerals generally represent the same components or steps.

[0016] Figure 1 This is a schematic diagram of the structure of a telescopic device in a first state, provided as an exemplary embodiment of this application.

[0017] Figure 2 This is a schematic diagram of the structure of a telescopic device in a second state, provided as an exemplary embodiment of this application.

[0018] Figure 3 A structural block diagram of a control component provided for an exemplary embodiment of this application.

[0019] Figure 4 This is a schematic flowchart of an exhaust method provided for an exemplary embodiment of this application.

[0020] Figure 5 A schematic flowchart of an exhaust method provided for another exemplary embodiment of this application.

[0021] Figure 6 This is a structural block diagram of a control module provided for an exemplary embodiment of this application.

[0022] Reference numerals: 100-Telescopic device; 110-Hydraulic cylinder; 111-Rodless section; 112-Rod section; 113-Cylinder body; 114-Piston; 115-Piston rod; 1151-First rod; 1152-Second rod; 120-Exhaust passage; 130-Exhaust valve; 140-Boom; 141-Fixed boom; 142-Telescopic boom; 1421-Sliding frame; 150-Control component; 151-Cable; 152-Receiver module; 153-Control module; 1531-Processor; 1532-Memory; 1533-Input device; 1534-Output device; 154-Transmitter module; 155-Battery module. Detailed Implementation

[0023] Hereinafter, exemplary embodiments according to this application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this application, and not all embodiments of this application. It should be understood that this application is not limited to the exemplary embodiments described herein.

[0024] In construction machinery involving telescopic booms, the common practice for venting gas from hydraulic cylinders is to drive the cylinders in a full-stroke reciprocating motion, hoping that the flow of hydraulic fluid will carry away any mixed or residual gas. However, when this method is applied to a specific scenario where the hydraulic cylinders are inverted and vertically installed on a multi-layer boom, the venting effect is not ideal. Specifically, in construction machinery involving telescopic booms, because the rodless chamber of the hydraulic cylinder is located at the top, gas naturally accumulates at the top of the cylinder due to buoyancy. At this point, simply driving the hydraulic cylinder in a reciprocating motion is insufficient; the hydraulic fluid circulation cannot effectively reach and remove the gas from the dead corner at the top, resulting in incomplete venting. Furthermore, the hydraulic cylinder is prone to cavitation or gas explosion problems during the full-stroke reciprocating motion, which can easily damage the hydraulic cylinder.

[0025] Therefore, this application provides a telescopic device, an exhaust method, and engineering machinery that can solve the above-mentioned technical problems. The telescopic device, exhaust method, and engineering machinery will be described in detail below.

[0026] Figure 1 This is a schematic diagram of the structure of a telescopic device in a first state, provided as an exemplary embodiment of this application. Figure 2 This is a schematic diagram of the telescopic device in a second state, provided as an exemplary embodiment of this application. Figure 1 and Figure 2 As shown, the telescopic device 100 provided in this application embodiment may include a hydraulic cylinder 110 and a boom 140. The hydraulic cylinder 110 is connected to the boom 140, and the hydraulic cylinder 110 can drive the boom 140 to extend or retract.

[0027] like Figure 1 and Figure 2 As shown, the hydraulic cylinder 110 includes a rodless section 111 and a rod section 112, which are distributed along the length of the hydraulic cylinder 110. Specifically, the hydraulic cylinder 110 typically includes a cylinder body 113, a piston 114, and a piston rod 115. The piston 114 is connected to the piston rod 115 and is located inside the cylinder body 113. The piston 114 can divide the cylinder body 113 into the rodless section 111 and the rod section 112.

[0028] like Figure 1 and Figure 2 As shown, the boom 140 may include a fixed boom 141 and a telescopic boom 142. The fixed boom 141 is connected to the piston rod 115, and the telescopic boom 142 is connected to the cylinder body 113, with the telescopic boom 142 slidingly engaged with the fixed boom 141. In practical applications, when the hydraulic cylinder 110 is activated, the piston 114 moves within the cylinder body 113, which in turn drives the telescopic boom 142 to slide relative to the fixed boom 141, thus achieving the function of extension or retraction.

[0029] In one embodiment, the piston rod 115 can be a single-rod structure or a multi-rod structure. In a multi-rod structure, multiple rods are nested together to achieve the function of elongation or shortening. For example, as... Figure 1 and Figure 2 As shown, the piston rod 115 includes a first rod 1151 and a second rod 1152. The first rod 1151 is fitted inside the cylinder 113, and the second rod 1152 is fitted inside the first rod 1151. During the extension process, the first rod 1151 gradually slides out relative to the cylinder 113, and the second rod 1152 gradually slides out relative to the first rod 1151, forming a two-stage telescopic structure. The shortening process is the reverse of the extension process, and will not be described in detail here.

[0030] like Figure 1 and Figure 2 As shown, the telescopic device 100 may also include an exhaust channel 120 and an exhaust valve 130. The exhaust channel 120 is connected to the end of the rodless cavity 111 away from the rod cavity 112. The exhaust valve 130 is provided on the exhaust channel 120 and can control the opening and closing of the exhaust channel 120.

[0031] It should be noted that when gas accumulates in the rodless chamber 111, the exhaust valve 130 is opened, controlling the piston 114 in the hydraulic cylinder 110 to move, gradually compressing the volume of the rodless chamber 111. The gas can then be discharged outside the hydraulic cylinder 110 through the exhaust passage 120. On the one hand, during the exhaust process, the piston 114 can directly act on the gas accumulated in the rodless chamber 111, allowing the gas to directly enter the exhaust passage 120, effectively reducing the amount of gas residue in the rodless chamber 111 and improving the problem of incomplete exhaust in related technologies. On the other hand, during the exhaust process, the piston 114 does not need to reciprocate multiple times, avoiding cavitation or explosion problems caused by gas accumulation, and preventing additional damage to the hydraulic cylinder 110.

[0032] In one embodiment, the exhaust valve 130 may be a solenoid valve.

[0033] In one embodiment, the exhaust passage 120 can be formed by directly welding a pipe onto the cylinder body 113 of the hydraulic cylinder 110; or, the exhaust passage 120 can also be connected to the rodless cavity section 111 via a transition joint.

[0034] In one embodiment, the end of the exhaust passage 120 away from the hydraulic cylinder 110 can be connected to one end of a hose, and the other end of the hose can be connected to a recovery tank, which is used to store the discharged oil-gas mixture to avoid environmental pollution.

[0035] like Figure 1 and Figure 2As shown, along the Z-axis direction (which can be understood as the telescopic direction of the telescopic device 100 in this application, and usually also refers to the vertical direction), the hydraulic cylinder 110 is installed upside down (the length direction of the hydraulic cylinder 110 coincides with the Z-axis direction), and the rodless cavity section 111 is located above the rod cavity section 112.

[0036] It should be noted that when the hydraulic cylinder 110 is installed upside down, the weight of the telescopic arm 142 can be used as the power for the retraction of the hydraulic cylinder 110. Specifically, the piston rod 115 is controlled to slide relative to the cylinder body 113, the cylinder body 113 drives the telescopic arm 142 to extend to a preset height, and then the telescopic arm 142 descends under its own weight, the telescopic arm 142 gradually shortens, the telescopic arm 142 drives the cylinder body 113 to slide relative to the piston rod 115, the piston 114 gradually compresses the volume in the rodless chamber 111, and the gas in the rodless chamber 111 can be gradually discharged through the exhaust passage 120. In other words, when the hydraulic cylinder 110 is installed upside down, the gas in the rodless chamber 111 can be discharged by the weight of the telescopic arm 142, without the need for an additional power source, which can effectively reduce energy consumption and cost.

[0037] It should be noted that when the hydraulic cylinder 110 is installed upside down, the gas in the rodless section 111 will accumulate at the highest point of the rodless section 111 (i.e., the end of the rodless section 111 away from the rod section 112) due to buoyancy. This makes it more difficult to expel the gas using the reciprocating motion of the piston 114 of the hydraulic cylinder 110, as in related technologies. However, in this embodiment, since the exhaust passage 120 is connected to the end of the rodless section 111 away from the rod section 112, when the hydraulic cylinder 110 is installed upside down, the exhaust passage 120 is located at the top of the hydraulic cylinder 110. Thus, when the piston 114 compresses the volume of the rodless section 111, the gas accumulated at the top of the rodless section 111 will gradually be discharged from the exhaust passage 120, effectively solving the problem of gas accumulation at the highest point of the rodless section 111 (i.e., the end of the rodless section 111 away from the rod section 112) caused by the upside-down installation of the hydraulic cylinder 110.

[0038] like Figure 1 and Figure 2 As shown, the telescopic arm 142 may include a multi-stage sliding frame 1421, which are nested and slidably engaged in sequence.

[0039] It should be noted that by increasing the number of sliding frames 1421, the maximum stroke of the multi-stage sliding frame 1421 can be increased, thereby achieving a greater working height. In addition, compared with a single sliding frame 1421, the multi-stage sliding frame 1421 has a greater self-weight, and the self-weight of the multi-stage sliding frame 1421 can more thoroughly expel the gas in the rodless cavity section 111.

[0040] It should be noted that in practical applications, for the multi-stage sliding frame 1421, the space between two adjacent sliding frames 1421 is narrow and compact, which is not conducive to the operator reaching into the top of the hydraulic cylinder 110 to control the opening or closing of the exhaust valve 130. Therefore, this embodiment of the application can also realize remote control of the opening or closing of the exhaust valve 130 to solve the aforementioned technical problem.

[0041] Specifically, Figure 3 This is a structural block diagram of a control component provided for an exemplary embodiment of this application. (See diagram below.) Figures 1 to 3 As shown, the telescopic device 100 may also include a control component 150, which is communicatively connected to the exhaust valve 130 and can control the exhaust valve 130 to open or close.

[0042] It should be understood that the exhaust valve 130 can be remotely operated using the control component 150. Operators do not need to reach into the internal space of the boom 140 to control the exhaust valve 130 from a safe location such as the ground or the cab to complete the exhaust process. This effectively solves the problem of inconvenient operation of the exhaust valve 130 due to the limited space between the multi-stage sliding frames 1421, greatly improving the safety, convenience, and feasibility of exhaust operations.

[0043] like Figures 1 to 3 As shown, the control component 150 may include a cable 151, a receiving module 152, a control module 153, and a transmitting module 154. The cable 151 is connected to the exhaust valve 130 and can be used to transmit current. Both the receiving module 152 and the control module 153 are connected to the cable 151. The receiving module 152 receives control commands, and the control module 153 controls the exhaust valve 130 to open or close according to the commands received by the receiving module 152. The transmitting module 154 is communicatively connected to the receiving module 152 and can be used to send control commands.

[0044] It should be noted that the transmitting module 154 and the receiving module 152 can communicate wirelessly (e.g., radio frequency, Bluetooth). With the help of wireless signals, operators can use the transmitting module 154 to issue control commands from a safe location such as the ground or the driver's cab to control the opening or closing of the exhaust valve 130.

[0045] In one embodiment, the control module 153 and the receiving module 152 can be integrated in the same device; or, the control module 153 and the receiving module 152 can be independent modules.

[0046] In one embodiment, the sending module 154 can be integrated into a device such as a remote controller or control cabinet.

[0047] like Figures 1 to 3 As shown, the control component 150 may also include a battery module 155, which is electrically connected to the receiving module 152 and the control module 153, and can supply power to the receiving module 152 and the control module 153.

[0048] It should be understood that the battery module 155 can ensure that the receiving module 152 and the control module 153 can be in working condition for a long time, thereby improving the overall reliability of the control component 150.

[0049] like Figures 1 to 3 As shown, cable 151, receiving module 152, control module 153, and battery module 155 are all located inside the telescopic arm 142. This structural design can produce at least the following technical effects: First, the cable 151 does not need to be routed from the outside to the telescopic arm 142, which can solve the problems of complex wiring and small wiring space in related technologies.

[0050] Secondly, the control component 150 does not require an external power supply mechanism from the telescopic device 100, which simplifies the overall structure and improves the overall reliability of the control component 150.

[0051] Third, the telescopic arm 142 can protect the cable 151, the receiving module 152, the control module 153 and the battery module 155, preventing these components from being affected by collisions with external objects.

[0052] Fourth, it can make full use of the internal space of the telescopic arm 142, improve space utilization, and make the telescopic device 100 more compact in structure.

[0053] Fifth, during the extension or retraction of the telescopic arm 142, the cable 151, receiving module 152, control module 153, and battery module 155 can move synchronously with the telescopic arm 142, which can reduce the risk of the cable 151 being stretched or bent, and improve the overall reliability and durability of the control component 150.

[0054] In one embodiment, the control component 150 does not necessarily have to use a wireless mode; it can also use a hardwired control mode. The transmitting module 154 and the receiving module 152 are connected via a hardwire to achieve signal transmission.

[0055] Figure 4 This is a schematic flowchart illustrating an exemplary embodiment of the exhaust method provided in this application. Figure 4 Furthermore, this application embodiment also provides an exhaust method, which is applied to the telescopic device 100 as described in the previous embodiment. Specifically, the exhaust method may include: S410: Open the exhaust valve.

[0056] S420: Controls the piston movement of the hydraulic cylinder to compress the volume of the rodless chamber so that gas can be discharged from the exhaust passage.

[0057] It should be understood that when gas accumulates in the rodless chamber 111, opening the exhaust valve 130 controls the piston 114 in the hydraulic cylinder 110 to move, gradually compressing the volume of the rodless chamber 111. The gas can then be discharged out of the hydraulic cylinder 110 through the exhaust passage 120. On the one hand, during the exhaust process, the piston 114 can directly act on the gas accumulated in the rodless chamber 111, allowing the gas to directly enter the exhaust passage 120, effectively reducing the amount of gas remaining in the rodless chamber 111 and improving the problem of incomplete exhaust in related technologies. On the other hand, during the exhaust process, the piston 114 does not need to reciprocate multiple times, avoiding cavitation or explosion problems caused by gas accumulation and preventing additional damage to the hydraulic cylinder 110.

[0058] Figure 5 A schematic flowchart of an exhaust method provided for another exemplary embodiment of this application. (See attached diagram.) Figure 5 As shown, prior to step S410, the exhaust method may further include: S430: Controls the telescopic boom to slide relative to the fixed boom to a preset height.

[0059] Specifically, step S430 can impart a certain gravitational potential energy to the telescopic arm 142, making it convenient for the telescopic arm 142 to use its own weight to drive the hydraulic cylinder 110 to move.

[0060] It should be noted that the preset height can be understood as the length between the end of the telescopic arm 142 away from the fixed arm 141 and the end of the fixed arm 141 away from the telescopic arm 142. It should be understood that the preset height can be selected according to actual circumstances, and this embodiment does not specifically limit the preset height.

[0061] Correspondingly, step S420 may include: S421: The telescopic boom descends under its own weight, causing the piston of the hydraulic cylinder to move and compress the volume of the rodless chamber to expel gas from the exhaust passage.

[0062] It should be understood that by utilizing the weight of the telescopic arm 142 to descend, the telescopic arm 142 gradually shortens, causing the cylinder 113 to slide relative to the piston rod 115. The piston 114 then gradually compresses the volume within the rodless chamber 111, allowing the gas within the rodless chamber 111 to be gradually discharged through the exhaust passage 120. In other words, the gas within the rodless chamber 111 can be discharged using the weight of the telescopic arm 142. The entire process is simple and quick, requires no additional power source, and effectively reduces energy consumption and cost.

[0063] This application also provides an engineering machinery, which includes a body and a telescopic device 100 as described in the previous embodiment, the telescopic device 100 being mounted on the body. It should be understood that the engineering machinery possesses all the functions of the telescopic device 100, and the beneficial effects of the engineering machinery can be referenced to the beneficial effects of the aforementioned telescopic device 100.

[0064] In one embodiment, the construction machinery may include cranes, fire trucks, etc.

[0065] Figure 6 This is a structural block diagram of a control module provided for an exemplary embodiment of this application. (See diagram below.) Figure 6 As shown, the control module 153 includes one or more processors 1531 and a memory 1532.

[0066] The processor 1531 may be a central processing unit (CPU) or other form of processing unit with data processing capabilities and / or instruction execution capabilities, and may control other components in the control module 153 to perform desired functions.

[0067] The memory 1532 may include one or more computer program products, which may include various forms of computer-readable storage media, such as volatile memory 1532 and / or non-volatile memory 1532. The volatile memory 1532 may include, for example, random access memory 1532 (RAM) and / or cache memory 1532. The non-volatile memory 1532 may include, for example, read-only memory 1532 (ROM), hard disk, flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage medium, and the processor 1531 may execute the program instructions to implement the control methods and / or other desired functions of the various embodiments of this application described above. Various contents such as input signals, signal components, and noise components may also be stored in the computer-readable storage medium.

[0068] In one example, the control module 153 may also include an input device 1533 and an output device 1534, which are interconnected via a bus system and / or other forms of connection mechanism (not shown).

[0069] When the controller is a standalone device, the input device 1533 can be a communication network connector for receiving the acquired input signals from the first device and the second device.

[0070] In addition, the input device 1533 may also include, for example, a keyboard, a mouse, etc.

[0071] The output device 1534 can output various information to the outside, including determined distance information, direction information, etc. The output device 1534 may include, for example, a display, a speaker, a printer, and a communication network and its connected remote output devices, etc.

[0072] Of course, for the sake of simplicity, Figure 6 Only some of the components of the control module 153 relevant to this application are shown in this illustration; components such as buses, input / output interfaces, etc., are omitted. In addition, the control module 153 may include any other suitable components depending on the specific application.

[0073] The computer program product can be written in any combination of one or more programming languages ​​to perform the operations of the embodiments of this application. The programming languages ​​include object-oriented programming languages ​​such as Java and C++, as well as conventional procedural programming languages ​​such as C or similar languages. The program code can be executed entirely on the user's computing device, partially on the user's computing device, as a standalone software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0074] The computer-readable storage medium may be any combination of one or more readable media. A readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may be, for example, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of readable storage media (a non-exhaustive list) include: an electrical connection having one or more wires, a portable disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof.

[0075] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0076] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0077] It should also be noted that in the apparatus, equipment, and methods of this application, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered as equivalent solutions of this application.

[0078] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0079] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A telescopic device, characterized in that, include: A hydraulic cylinder includes a rodless cavity section and a rod cavity section distributed along the length direction of the hydraulic cylinder; The exhaust passage is connected to the end of the rodless cavity section away from the rod-type cavity section; An exhaust valve is provided on the exhaust passage; The boom includes a fixed boom and a telescopic boom. The fixed boom is connected to the piston rod of the hydraulic cylinder, the telescopic boom is slidably engaged with the fixed boom, and the telescopic boom is connected to the cylinder body of the hydraulic cylinder.

2. The telescopic device according to claim 1, characterized in that, Along the Z-axis, the hydraulic cylinder is inverted, and the rodless cavity is located above the rod-type cavity.

3. The telescopic device according to claim 1, characterized in that, The telescopic arm includes multiple sliding frames, which are nested and slidably fitted together.

4. The telescopic device according to any one of claims 1 to 3, characterized in that, The telescopic device also includes: A control component is communicatively connected to the exhaust valve, and the control component is used to control the exhaust valve to open or close.

5. The telescopic device according to claim 4, characterized in that, The control component includes: A cable is connected to the exhaust valve; The receiving module is connected to the cable; The control module is connected to the cable; The sending module is communicatively connected to the receiving module.

6. The telescopic device according to claim 5, characterized in that, The control component also includes: The battery module is electrically connected to the receiving module and the control module.

7. The telescopic device according to claim 6, characterized in that, The cable, the receiving module, the control module, and the battery module are all located inside the telescopic arm.

8. A method for venting exhaust, characterized in that, The venting method, applied to the telescopic device as described in any one of claims 1 to 7, comprises: Open the exhaust valve; The piston of the hydraulic cylinder is controlled to move, compressing the volume of the rodless chamber to discharge gas from the exhaust passage.

9. The exhaust method according to claim 8, characterized in that, Before opening the vent valve, the venting method further includes: Control the telescopic arm to slide relative to the fixed arm to a preset height; The control of the piston movement of the hydraulic cylinder to compress the volume of the rodless chamber to discharge gas from the exhaust passage includes: The telescopic arm descends under its own weight, causing the piston of the hydraulic cylinder to move and compress the volume of the rodless chamber, thereby expelling the gas from the exhaust channel.

10. An engineering machinery, characterized in that, include: Organism; The telescopic device as described in any one of claims 1 to 7 is provided on the body.

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