Counterweight structure and working machine

Abstract

The application relates to the technical field of excavators, and discloses a counterweight structure and a working machine, the counterweight structure being used for the working machine and comprising a main counterweight structure, the main counterweight structure comprising a flow guide assembly and a counterweight block, the flow guide assembly comprising a mounting frame and a flow guide pipe mounted on the mounting frame, an air inlet end of the flow guide pipe being used for butt joint with an exhaust pipe of the working machine; the counterweight block is provided with a mounting groove and an exhaust passage, the mounting frame is accommodated in the mounting groove and is arranged in a recessed mode relative to the mounting groove, a groove wall of the mounting frame is connected with the mounting groove, and an air outlet end of the flow guide pipe penetrates through the exhaust passage. Through the directional guiding effect of the flow guide assembly and the design that the air outlet end of the flow guide pipe penetrates through the exhaust passage, the problems of paint surface peeling, rusting or discoloration caused by direct spraying or diffusion of tail gas to the surface of the counterweight block are avoided, the service life of the counterweight structure is prolonged, and the neatness and beauty of the appearance of the equipment are maintained.

Description

Technical Field

[0001] This application belongs to the field of construction machinery technology, and specifically relates to a counterweight structure and construction machinery. Background Technology

[0002] Construction machinery, such as excavators, loaders, and bulldozers, includes excavators, which are general-purpose machines primarily used for excavating earth and rock, and are the most widely used type of construction machinery. Mini excavators, due to their small size, are suitable for working in confined spaces and are widely used in urban redevelopment and construction. The counterweight of an excavator is installed at the rear of the turntable. By increasing the overall weight of the vehicle, it offsets the load on the bucket, boom, and other working components, preventing the center of gravity from shifting and causing imbalance. To adapt to the narrower urban construction work, mini excavators are designed with a reduced tail-end turning radius, resulting in short-tail or tailless excavators. When heavy-duty attachments are installed on the working device, counterweight blocks are installed to prevent forward tilting and instability. However, after the counterweight is installed, the exhaust fumes will blacken it, and the high temperature of the exhaust fumes will damage the surrounding paint. After the paint peels off, the counterweight will rust, affecting the appearance of the equipment. Utility Model Content

[0003] In view of at least one of the above-mentioned defects or deficiencies in the prior art, this application provides a counterweight structure and operating machinery that enables exhaust gas to be discharged directly without affecting the counterweight.

[0004] To achieve the above objectives, this application provides a counterweight structure for use in operating machinery, the counterweight structure comprising: A flow guiding assembly includes a mounting bracket and a flow guiding pipe mounted on the mounting bracket, wherein the air inlet end of the flow guiding pipe is used to connect with the exhaust pipe of the working machinery; The counterweight is provided with a mounting groove and an exhaust channel. The mounting bracket is accommodated in the mounting groove and is recessed relative to the mounting groove. The mounting bracket is connected to the groove wall of the mounting groove, and the exhaust end of the guide pipe passes through the exhaust channel.

[0005] In some embodiments, the counterweight includes: Main counterweight, used to connect the operating machinery; A secondary counterweight is used to connect the main counterweight, and the mounting slot is formed in the secondary counterweight and located on the side where the secondary counterweight and the main counterweight are connected.

[0006] In some embodiments, the exhaust passage includes: A first exhaust passage is provided at the main counterweight, and the first exhaust passage is used for the exhaust pipe to pass through; The second exhaust channel is opened in the secondary counterweight and located in the mounting groove. The second exhaust channel is concentrically arranged with the first exhaust channel and is used for the exhaust end of the guide pipe to pass through.

[0007] In some embodiments, the inner diameter of the second exhaust passage is larger than the outer diameter of the guide pipe.

[0008] In some embodiments, the outlet end of the guide tube has a guide slope that is adapted to the outer surface of the secondary counterweight.

[0009] In some embodiments, the mounting bracket is detachably connected to the mounting slot.

[0010] In some embodiments, the mounting bracket further includes: A fixing plate is connected to the guide pipe, and the mounting groove is adapted to the shape of the fixing plate; A connector is used to connect the fixing plate and the wall of the mounting groove, and the connector is recessed relative to the mounting groove.

[0011] In some embodiments, the inside of the guide tube is spirally arranged.

[0012] In some embodiments, the inner diameter of the guide tube is larger than the outer diameter of the exhaust pipe, and the air inlet end of the guide tube is sleeved on the exhaust pipe.

[0013] A second aspect of this application provides a working machine, including a turntable, an engine, and a counterweight structure as described in any of the above claims, wherein the counterweight structure is connected to the rear of the turntable, one end of the exhaust pipe is connected to the engine, and the other end is connected to the guide pipe.

[0014] The aforementioned technical solution effectively increases the stability of the operating machinery by incorporating a counterweight. Through the directional guidance of the flow guide component and the design of the exhaust channel extending from the outlet of the flow guide pipe, the high-temperature exhaust gas is completely confined within the pipe and ultimately discharged centrally from the outlet. This prevents the exhaust gas from directly splashing or spreading onto the counterweight surface, effectively preventing high-temperature particles and corrosive chemicals in the exhaust gas from adhering to the outer surface of the counterweight. This avoids paint peeling, rusting, or discoloration caused by long-term exposure to heat, extending the service life of the counterweight structure and maintaining the clean and aesthetically pleasing appearance of the equipment. Simultaneously, the recessed installation structure enhances overall rigidity, reduces the impact of vibration on the exhaust system, significantly improves the durability of the counterweight structure, and extends the equipment's maintenance cycle and service life.

[0015] Other features and advantages of the embodiments of this application will be described in detail in the following detailed description section. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the following detailed description to explain the embodiments of this application, but do not constitute a limitation on the embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without any inventive effort. In the drawings: Figure 1 This is a schematic diagram of the counterweight structure and the working machinery in this utility model; Figure 2 This is a schematic diagram of the flow guide tube in this utility model; Figure 3 This is a schematic diagram showing the connection between the auxiliary counterweight and the guide pipe in this utility model; Figure 4 This is a schematic diagram of the counterweight structure in this utility model; Figure 5 This is another structural schematic diagram of the guide tube in this utility model; Figure 6 This is a cross-sectional view of the counterweight structure and the working machinery in this utility model.

[0017] Explanation of reference numerals in the attached figures Detailed Implementation

[0018] 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 this application.

[0019] The present application will now be described in detail with reference to the accompanying drawings and exemplary embodiments.

[0020] like Figure 1 and Figure 2 As shown, the first aspect of this application provides a counterweight structure 1 for use in a work machine 2. The counterweight structure 1 includes a flow guiding component 11 and a counterweight block 12. The flow guiding component 11 includes a mounting frame 111 and a flow guiding pipe 112 mounted on the mounting frame 111. The air inlet end 112a of the flow guiding pipe 112 is used to connect with the exhaust pipe 21 of the work machine 2. The counterweight block 12 is provided with a mounting groove 121 and an exhaust channel. The mounting frame 111 is accommodated in the mounting groove 121 and is recessed relative to the mounting groove 121. The mounting frame 111 and the groove wall of the mounting groove 121 are connected. The air outlet end 112b of the flow guiding pipe 112 passes through the exhaust channel.

[0021] The air guide assembly 11 includes a mounting bracket 111 and an air guide pipe 112 fixed thereon. The air inlet end 112a of the air guide pipe 112 is connected to the exhaust pipe 21. The counterweight 12 has a recessed mounting groove 121 and a through exhaust channel. The mounting bracket 111 is embedded and accommodated in the mounting groove 121, and its surface is recessed relative to the outer surface of the counterweight 12. At the same time, the air outlet end 112b of the air guide pipe 112 is located in the exhaust channel and passes through the exhaust channel. The counterweight 12 effectively increases the stability of the operating machinery 2. Through the directional guidance of the flow guide component 11 and the design of the outlet 112b of the flow guide pipe 112 penetrating the exhaust channel, the high-temperature exhaust gas is completely confined within the pipe and finally discharged from the outlet 112b of the flow guide pipe 112. This prevents the exhaust gas from directly splashing or spreading to the surface of the counterweight 12, effectively preventing high-temperature particles and corrosive chemicals in the exhaust gas from adhering to the outer surface of the counterweight 12. This avoids paint peeling, rusting, or discoloration caused by long-term exposure to heat, extending the service life of the counterweight structure 1 and maintaining the clean and aesthetically pleasing appearance of the equipment. At the same time, the recessed installation structure enhances the overall rigidity, reduces the impact of vibration on the exhaust system, significantly improves the durability of the counterweight structure 1, and extends the equipment maintenance cycle and service life.

[0022] In some implementations, such as Figure 1 , Figure 3 and Figure 4As shown, the counterweight 12 includes a main counterweight 123 and a secondary counterweight 124. The main counterweight 123 is used to connect the working machinery 2; the secondary counterweight 124 is used to connect the main counterweight 123. The mounting slot 121 is formed in the secondary counterweight 124 and located on the side where the secondary counterweight 124 connects to the main counterweight 123. The counterweight 12 is configured as a split structure of the main counterweight 123 and the secondary counterweight 124, wherein the main counterweight 123 is directly connected to the body of the working machinery 2; the secondary counterweight 124 is connected to the rear of the main counterweight 123. The main counterweight 123 undertakes the main load-bearing and primary heat insulation protection functions, effectively blocking the heat of the engine 23 from being transferred to the secondary counterweight 124; the secondary counterweight 124 is used for terminal exhaust protection and appearance maintenance. The mounting groove 121 is formed on the mating surface where the secondary counterweight 124 and the main counterweight 123 connect, allowing the mounting bracket 111 of the flow guide assembly 11 to be fully embedded in the mounting groove 121 inside the secondary counterweight 124, forming a flat connection structure with the mating surface of the main counterweight 123. Through the embedding and accommodating structure of the mounting bracket 111 in the mounting groove 121, a compact integrated installation of the flow guide pipe 112 assembly and the secondary counterweight 124 is achieved. This allows the secondary counterweight 124 to fit tightly against the main counterweight 123, effectively reducing the overall thickness of the counterweight structure and avoiding the risk of bumps or interference caused by external protrusions during operation. This ensures both the smoothness and sealing of the exhaust path of the flow guide pipe 112, and the embedded layout prevents the mounting bracket 111 from getting stuck between the main counterweight 123 and the secondary counterweight 124, thus avoiding any impact on the strength of the connection between the main counterweight 123 and the secondary counterweight 124.

[0023] In some embodiments, the exhaust passage includes a first exhaust passage 125 and a second exhaust passage 122. The first exhaust passage 125 is located in the main counterweight 123 and is used for the exhaust pipe 21 to pass through. The second exhaust passage 122 is located in the secondary counterweight 124 and is situated within the mounting groove 121. The second exhaust passage 122 is concentrically arranged with the first exhaust passage 125 and is used for the outlet end 112b of the guide pipe 112 to pass through. The first exhaust passage 125 longitudinally penetrates the main counterweight 123, providing a passage for the excavator's exhaust pipe 21. The second exhaust passage 122 is located at the bottom of the mounting groove 121 of the secondary counterweight 124 and is concentrically aligned with the first exhaust passage 125. This ensures that the exhaust pipe 21, the first exhaust passage 125 of the main counterweight 123, the guide pipe 112 and its outlet end 112b, and the second exhaust passage 122 of the secondary counterweight 124 together form a straight and complete exhaust path, ensuring that the airflow can smoothly pass through the counterweight structure. The straightened exhaust path formed by the concentric arrangement of the dual channels significantly reduces exhaust flow resistance and exhaust back pressure, thereby reducing vibration and noise caused by airflow disturbance. The main counterweight undertakes the primary functions of heat insulation and structural support, while the secondary counterweight focuses on guiding the final exhaust and protecting the appearance. This division of labor effectively blocks the transfer of engine heat to the outside of the equipment. Moreover, it ensures that the high-temperature exhaust flows within a closed channel throughout the entire process, avoiding thermal erosion of the secondary counterweight's outer surface by the exhaust gas. This solves the problem of paint peeling and discoloration caused by high-temperature baking, maintaining the aesthetic appearance of the equipment and significantly extending the service life of the counterweight system.

[0024] In some implementations, such as Figure 1 As shown, the outlet end 112b of the guide pipe 112 has a guide slope, which is adapted to the outer surface of the secondary counterweight 124. In the embodiment provided by this utility model, both the main counterweight 123 and the secondary counterweight 124 are arc-shaped counterweight blocks 12, therefore, the outer surface of the secondary counterweight 124 is arc-shaped. The outlet end 112b of the guide pipe 112 is set with a guide slope at a specific angle, and the inclination angle of the guide slope is perfectly matched with the contour curve of the outer surface of the secondary counterweight 124. When the guide pipe 112 is installed in place, the outlet end 112b with the guide slope can form a smooth transition continuous curved surface with the outer surface of the secondary counterweight 124, realizing the seamless integration of the outlet end 112b with the appearance of the equipment. Through the precise fit between the guide slope and the shape of the secondary counterweight 124, the high-temperature exhaust gas can be guided along the slope direction and discharged smoothly, effectively avoiding the generation of eddies in the airflow at the outlet or the adsorption effect on the surrounding area. This design not only significantly reduces exhaust resistance and improves emission efficiency, but more importantly, it eliminates the diffusion and splashing of exhaust gas at the outlet edge, preventing high-temperature exhaust gas from contacting and corroding the paint layer on the outer surface of the secondary counterweight 124, thereby ensuring both exhaust performance and the aesthetics of the equipment.

[0025] In some embodiments, the mounting bracket 111 and the mounting slot 121 are detachably connected. The mounting bracket 111 and the mounting slot 121 are connected by bolts or other detachable methods, allowing the entire flow guide assembly 11 to be completely removed from or installed from the mounting slot 121 without damaging the main structure. This detachable connection improves the convenience and economy of maintaining the flow guide assembly 11. When the flow guide pipe 112 accumulates carbon due to long-term use or requires maintenance, the mounting bracket 111 can be directly removed for cleaning or replacement, avoiding the difficulty of replacing the entire counterweight 12 required by traditional welded fixing. This not only reduces maintenance costs but also ensures that the exhaust passage remains unobstructed by facilitating regular cleaning.

[0026] In some implementations, such as Figure 5 and Figure 1 As shown, the mounting bracket 111 also includes a fixing plate 1111 and a connector 1112. The fixing plate 1111 is connected to the guide pipe 112, and the mounting groove 121 is adapted to the shape of the fixing plate 1111. The connector 1112 is used to connect the fixing plate 1111 and the groove wall of the mounting groove 121, and the connector 1112 is recessed relative to the mounting groove 121. The connector 1112 can be a bolt, and corresponding connection holes are provided on the groove walls of the fixing plate 1111 and the mounting groove 121. The fixing plate 1111 is connected to the body of the guide pipe 112 by welding or integral molding, and the shape of the fixing plate 1111 is precisely adapted to the mounting groove 121 on the secondary counterweight 124. The connector 1112 passes through the corresponding connection holes on the fixing plate 1111 and the wall of the mounting groove 121, and the bolt head is completely sunk into the mounting groove 121 by recessed installation, without exceeding the surface contour of the inner side of the secondary counterweight 124. This embedded connection structure achieves uniform stress distribution, improves the vibration resistance of the guide tube 112, and makes the installation structure more compact. The recessed connector 1112 eliminates the risk of collision caused by external protrusions and avoids interference between the secondary counterweight 124 and the main counterweight 123 during installation, thus affecting the installation of the secondary counterweight 124.

[0027] In some embodiments, the guide pipe 112 is internally spirally arranged. The guide pipe 112 is designed with a spiral structure, meaning that continuously circling spiral guide vanes are arranged on the inner wall of the pipe, causing the airflow channel to extend in a spiral shape. This allows the high-temperature exhaust gas, when passing through the guide pipe 112, to be guided by the spiral guide vanes, changing from a straight flow to a rotating vortex motion. This significantly increases the contact area and heat exchange time between the airflow and the pipe wall, effectively reducing the temperature of the exhaust gas; it can guide the exhaust gas into a spiral, making the exhaust more concentrated and faster; simultaneously, the spiral structure can change the straight-line trajectory of large particulate matter, causing it to separate from the airflow under centrifugal force and adhere to the pipe wall. This not only significantly reduces the thermal shock of the high-temperature exhaust gas to the outlet area of ​​the secondary counterweight 124, preventing aging and peeling of the paint due to long-term high-temperature baking, but also maintains the cleanliness of the exhaust port through particulate matter separation, further extending the service life of the counterweight system.

[0028] In some implementations, such as Figure 6 As shown, the inner diameter of the second exhaust channel 122 is larger than the outer diameter of the guide pipe 112. Although the exhaust end 112b of the guide pipe 112 extends into the second exhaust channel 122, the pipe wall of the guide pipe 112 and the inner wall of the second exhaust channel 122 remain in a non-contact state throughout the entire process. The inner diameter of the second exhaust channel 122 can be about 10mm larger than the outer diameter of the guide pipe 112, forming an annular gap structure. The annular gap structure creates an effective heat buffer area, which not only avoids the high-temperature guide pipe 112 from conducting heat to the secondary counterweight 124 through direct contact, but also prevents frictional damage caused by vibration transmission. At the same time, the gap between the second exhaust channel 122 and the guide pipe 112 facilitates the extraction and installation of the guide pipe 112 from the second exhaust channel 122.

[0029] In some embodiments, the inner diameter of the guide pipe 112 is larger than the outer diameter of the exhaust pipe 21, and the air inlet end 112a of the guide pipe 112 is sleeved onto the exhaust pipe 21. The inner diameter of the air inlet end 112a of the guide pipe 112 is slightly larger than the outer diameter of the exhaust pipe 21 on the excavator, allowing the guide pipe 112 to be directly sleeved onto the outside of the exhaust pipe 21. The sleeved connection structure is usually reinforced with clamps or high-temperature sealing rings for tight sealing, ensuring both airtightness and maintaining a certain degree of freedom in installation and adjustment. This non-rigid sleeved connection structure effectively compensates for the vibration displacement and thermal expansion differences of the engine 23 during operation, avoiding pipe deformation or cracking caused by stress concentration; at the same time, the sleeved connection method facilitates installation and maintenance.

[0030] The second aspect of this application provides a working machine 2, such as... Figure 1As shown, the equipment includes a turntable 22, an engine 23, and a counterweight structure 1 as described above. The counterweight structure 1 is connected to the rear of the turntable 22. One end of the exhaust pipe 21 is connected to the engine 23, and the other end is connected to the guide pipe 112. The working machine 2 includes a turntable 22, an engine 23, and a counterweight structure 1. The counterweight structure 1 is connected to the rear of the turntable 22. One end of the exhaust pipe 21 is connected to the engine 23, and the other end passes through the first exhaust passage 125 of the main counterweight 123 and is connected to the guide pipe 112. After installing the guide pipe 112 and the secondary counterweight 124, the exhaust gas emitted by the engine 23 passes through the muffler 24 and the exhaust pipe 21, and is directly discharged through the guide pipe 112. The exhaust gas has no effect on the secondary counterweight 124, maintaining the aesthetic appearance of the equipment.

[0031] Specifically, the operating machinery 2 can be a small excavator with a short tail or no tail. Small excavators can adapt to working in narrow environments. When a heavy-duty attachment is installed in front of a small excavator, its stability is poor, so a secondary counterweight 124 is needed to increase stability. During installation, the main counterweight 123 is fixed to the rear of the excavator turntable 22 by bolts. The exhaust pipe 21 of the engine 23 passes through the first exhaust passage 125 of the main counterweight 123. To prevent the exhaust pipe 21 from being damaged when the excavator rotates, the length of the exhaust pipe 21 does not exceed the thickness of the main counterweight 123. In other words, the length of the exhaust pipe 21 does not exceed the depth of the first exhaust passage 125.

[0032] A mounting bracket 111 is welded onto the guide pipe 112. The fixing plate 1111 of the mounting bracket 111 has two connecting holes. In the embodiment provided by this utility model, the first exhaust channel 125 is located at a lower position. Due to size limitations, the two connecting holes on the fixing plate 1111 can only be designed above the guide pipe 112. The design of the secondary counterweight 124 and the mounting bracket 111 in this utility model is simple and easy to process. Moreover, the secondary counterweight 124 can be obtained by processing and modifying the original secondary counterweight 124. The processing amount is small, and if there is stock, it can be processed and used, saving costs.

[0033] Based on the dimensions of the mounting bracket 111, a mounting groove 121 and two connecting holes are made on the inner side of the arc of the secondary counterweight 124. The depth of the mounting groove 121 is designed according to the thickness of the mounting bracket 111 and the length of the connector 1112, so that the mounting bracket 111 and the connector 1112 can be completely accommodated in the mounting groove 121. Before installing the secondary counterweight 124, the guide pipe 112 and the mounting bracket 111 are fixed in the mounting groove 121 of the secondary counterweight 124 through the connector 1112. The heads of the mounting bracket 111 and the connector 1112 do not exceed the inner arc surface of the secondary counterweight 124 to avoid affecting the installation between the secondary counterweight 124 and the main counterweight 123. After the guide pipe 112 is installed, the guide pipe 112 should not protrude from the outer side of the secondary counterweight 124 to avoid damage to the guide pipe 112 during the excavator selection process.

[0034] When installing the secondary counterweight 124, connect the guide pipe 112 and the exhaust pipe 21. To prevent damage from collision, fit the guide pipe 112 onto the exhaust pipe 21, with the exhaust pipe 21 extending into the guide pipe 112 until the secondary counterweight 124 is flush with the main counterweight 123. Alternatively, the guide pipe 112 can be fixed to the tail of the main counterweight 123 or directly connected to the exhaust pipe 21 before installing the secondary counterweight 124. This allows for a more direct connection between the guide pipe 112 and the exhaust pipe 21, simplifying the installation. If disassembly is required, first remove the secondary counterweight 124. After removing the secondary counterweight 124, the guide pipe 112 can be removed, taking care to prevent damage from impacts.

[0035] 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.

[0036] 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.

[0037] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of 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.

[0038] 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 counterweight structure for use in operating machinery (2), characterized in that, The counterweight structure (1) includes: The flow guide assembly (11) includes a mounting bracket (111) and a flow guide pipe (112) mounted on the mounting bracket (111), wherein the air inlet end (112a) of the flow guide pipe (112) is used to connect with the exhaust pipe (21) of the working machine (2); The counterweight (12) is provided with a mounting groove (121) and an exhaust channel. The mounting bracket (111) is accommodated in the mounting groove (121) and is recessed relative to the mounting groove (121). The mounting bracket (111) and the groove wall of the mounting groove (121) are connected. The exhaust end (112b) of the guide pipe (112) passes through the exhaust channel.

2. The counterweight structure (1) according to claim 1, characterized in that, The counterweight (12) includes: Main counterweight (123) is used to connect the working machinery (2); A secondary counterweight (124) is used to connect the main counterweight (123). The mounting groove (121) is opened in the secondary counterweight (124) and located on the side where the secondary counterweight (124) and the main counterweight (123) are connected.

3. The counterweight structure (1) according to claim 2, characterized in that, The exhaust passage includes: The first exhaust passage (125) is opened in the main counterweight (123), and the first exhaust passage (125) is used for the exhaust pipe (21) to pass through; The second exhaust channel (122) is opened in the secondary counterweight (124) and located in the mounting groove (121). The second exhaust channel (122) is concentrically arranged with the first exhaust channel (125). The second exhaust channel (122) is used for the outlet end (112b) of the guide pipe (112) to pass through.

4. The counterweight structure (1) according to claim 3, characterized in that, The inner diameter of the second exhaust channel (122) is larger than the outer diameter of the guide pipe (112).

5. The counterweight structure (1) according to claim 2, characterized in that, The outlet end (112b) of the guide pipe (112) has a guide slope, which is adapted to the outer surface of the secondary counterweight (124).

6. The counterweight structure (1) according to any one of claims 1 to 5, characterized in that, The mounting bracket (111) is detachably connected to the mounting slot (121).

7. The counterweight structure (1) according to claim 6, characterized in that, The mounting bracket (111) also includes: A fixing plate (1111) is connected to the guide pipe (112), and the mounting groove (121) is adapted to the shape of the fixing plate (1111). A connector (1112) is used to connect the fixing plate (1111) and the groove wall of the mounting groove (121), and the connector (1112) is recessed relative to the mounting groove (121).

8. The counterweight structure (1) according to any one of claims 1 to 5, characterized in that, The guide tube (112) is spirally arranged inside.

9. The counterweight structure (1) according to any one of claims 1 to 5, characterized in that, The inner diameter of the guide pipe (112) is larger than the outer diameter of the exhaust pipe (21), and the air inlet end (112a) of the guide pipe (112) is sleeved on the exhaust pipe (21).

10. A type of operating machinery (2), characterized in that, It includes a turntable (22), an engine (23) and a counterweight structure (1) as described in any one of claims 1 to 9, the counterweight structure (1) being connected to the tail of the turntable (22), one end of the exhaust pipe (21) being connected to the engine (23), and the other end being connected to the guide pipe (112).

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