Hydraulic oil preheating device

Abstract

The application provides a hydraulic oil preheating device, which comprises a tail gas recovery pipe and a heating pipe, a receiving port of the tail gas recovery pipe is used for being connected to an exhaust port of an engine to receive tail gas, the heating pipe is arranged at an oil suction port at the bottom of a hydraulic oil tank to preheat the hydraulic oil, and an air inlet of the heating pipe is connected to an air outlet port of the tail gas recovery pipe to introduce the tail gas with a first temperature, and the tail gas with the first temperature is used for heat exchange with the hydraulic oil. By connecting the tail gas recovery pipe with the heating pipe, the tail gas discharged from the exhaust port of the engine is introduced into the heating pipe arranged in the hydraulic oil tank through the tail gas recovery pipe, and the tail gas with the first temperature in the heating pipe can be heat exchanged with the hydraulic oil, so that the temperature of the hydraulic oil is increased, thereby realizing preheating of the hydraulic oil. The high-temperature tail gas of the engine is introduced into the heating pipe to preheat the hydraulic oil, and the preheating efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of hydraulic oil tank technology, and more specifically to a hydraulic oil preheating device. Background Technology

[0002] A hydraulic oil tank is a container used to store the hydraulic fluid required for the operation of a hydraulic system. Its main function is to store the fluid needed for system circulation. When the ambient temperature is too low, the hydraulic oil viscosity increases, which can affect the normal operation of the hydraulic system and lead to equipment failure.

[0003] In existing technologies, heating devices are typically installed in hydraulic oil tanks to preheat the hydraulic oil. For example, patent application number 202010710152.6 describes a method where a heating pipe is installed at the oil inlet at the bottom of the hydraulic oil tank and connected to the engine's cooling system. Water in the engine's cooling system is used as coolant to cool the engine. After circulation, the water temperature rises, and hot water from the cooling system is introduced into the heating pipe, allowing the hot water to exchange heat with the coolant at a lower temperature. This causes the water temperature to drop and the oil temperature to rise, thus heating the hydraulic oil. The cooled water then flows back into the cooling system to cool the engine, forming a water circulation system that can cool the engine and heat the hydraulic oil. This system has the advantages of energy saving and environmental protection. However, for hydraulic oil, it takes a certain amount of time for the water temperature to rise from the outdoor temperature to a high temperature after circulating through the cooling system, and the temperature will not be very high after the water temperature rises. Under such circumstances, it is not possible to quickly heat the hydraulic oil after the construction machinery is started, and the heating efficiency is low and cannot meet the requirements. Summary of the Invention

[0004] In view of this, the present invention provides a hydraulic oil preheating device to solve the problem of low heating efficiency of hydraulic oil heating devices in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A hydraulic oil preheating device according to an embodiment of the present invention includes:

[0007] An exhaust gas recovery pipe, wherein the receiving port of the exhaust gas recovery pipe is used to connect to the exhaust port of the engine to receive exhaust gas;

[0008] A heating element is configured to be located at the oil inlet at the bottom of the hydraulic oil tank to preheat the hydraulic oil. The air inlet of the heating element is connected to the exhaust port of the exhaust gas recovery pipe to introduce exhaust gas with a first temperature, which is used for heat exchange with the hydraulic oil.

[0009] Furthermore, the receiving port is configured to be positioned opposite the engine's exhaust port.

[0010] Furthermore, an exhaust gas purifier for processing the received exhaust gas is provided on the side of the exhaust gas recovery pipe near the receiving port.

[0011] A solenoid valve for controlling the on / off state of the exhaust gas is also provided near the outlet of the exhaust gas purifier on the exhaust gas recovery pipe.

[0012] Furthermore, the hydraulic oil preheating device in this embodiment of the invention may further include:

[0013] An exhaust pipe is formed as a three-way pipe having a first end, a second end, and a third end. The first end is connected to the outlet end of the heating tube to receive the exhaust gas after heat exchange. The second end is used to connect to a vacuum pump to create a negative pressure inside the heating tube. The third end is used to communicate with the atmospheric environment to discharge the exhaust gas after heat exchange.

[0014] Furthermore, the exhaust gas recovery pipe also includes a temperature regulating section, which is configured to be located on the outer wall of the hydraulic oil tank.

[0015] Furthermore, the temperature regulation section includes:

[0016] A first spiral tube has a first spiral end and a second spiral end. The first spiral tube extends spirally from the first spiral end toward the second spiral end from the outside to the inside, and the first spiral end is connected to the exhaust port of the exhaust gas recovery pipe.

[0017] The second spiral tube has a third spiral end communicating with the second spiral end and a fourth spiral end connected to the air inlet end of the heating tube, and the second spiral tube extends spirally from the third spiral end toward the fourth spiral end from the inside out.

[0018] The plane containing the first spiral tube is coplanar with the plane containing the second spiral tube.

[0019] Furthermore, the hydraulic oil preheating device in this embodiment of the invention may further include:

[0020] A heat insulation component is configured to be connected to the outer wall of the hydraulic oil tank. The heat insulation component includes heat insulation cloth, which is disposed above the temperature regulating section or movably covers the outer periphery of the temperature regulating section to regulate the temperature of the exhaust gas within the temperature regulating section.

[0021] Furthermore, the insulation component also includes:

[0022] The upper crossbeam is located above the exhaust gas recovery pipe;

[0023] A spring reel is mounted on the upper crossbeam. The spring reel is configured to automatically rebound. One edge of the insulation cloth is fixed to the rotating shaft of the spring reel, and at least a portion of the insulation cloth is wound onto the rotating shaft.

[0024] Furthermore, the hydraulic oil preheating device in this embodiment of the invention may further include:

[0025] A fixing strip is attached to the other end of the insulation cloth.

[0026] Furthermore, the hydraulic oil preheating device in this embodiment of the invention may further include:

[0027] Two side beams are connected to the end of the upper crossbeam, and the upper crossbeam and the two side beams surround the outer periphery of the exhaust gas recovery pipe. The end of the fixing strip is provided with multiple suction cups, which can be adsorbed onto the side beams at corresponding positions.

[0028] The above-described technical solution of the present invention has at least one of the following beneficial effects: The hydraulic oil preheating device of the present invention includes an exhaust gas recovery pipe and a heating pipe. The receiving port of the exhaust gas recovery pipe is connected to the exhaust port of the engine to receive exhaust gas. The heating pipe is configured to be located at the oil inlet at the bottom of the hydraulic oil tank to preheat the hydraulic oil. The air inlet of the heating pipe is connected to the exhaust port of the exhaust gas recovery pipe to introduce exhaust gas with a first temperature. The exhaust gas with the first temperature is used for heat exchange with the hydraulic oil. That is, the exhaust gas recovery pipe is connected to the heating pipe, and the exhaust gas discharged from the engine exhaust port is introduced into the heating pipe located in the hydraulic oil tank through the exhaust gas recovery pipe. The exhaust gas with the first temperature in the heating pipe can exchange heat with the hydraulic oil, causing the temperature of the hydraulic oil to rise, thereby achieving preheating of the hydraulic oil. The present invention improves the preheating efficiency by introducing the high-temperature exhaust gas of the engine (which can reach above 400°C) into the heating pipe to preheat the hydraulic oil. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the installation structure of a hydraulic oil preheating device according to an embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram of a partial hydraulic oil preheating device according to an embodiment of the present invention;

[0031] Figure 3 This is a schematic diagram of the installation structure of a hydraulic oil preheating device according to another embodiment of the present invention;

[0032] Figure 4 This is a schematic diagram of the insulation cloth of a hydraulic oil preheating device according to another embodiment of the present invention in its original state;

[0033] Figure 5 This is a schematic diagram of the structure of a hydraulic oil preheating device according to another embodiment of the present invention, in which the insulation cloth covers the outer periphery of the temperature regulating section.

[0034] Figure label:

[0035] 001. Hydraulic oil tank; 001a. Filter component; 001b. Temperature sensor; 002. Engine; 002a. Exhaust port; 100. Exhaust gas recovery pipe; 110. Receiver port; 120. Exhaust port; 130. Temperature regulation section; 131. First spiral tube; 131a. First spiral end; 131b. Second spiral end; 132. Second spiral tube; 132a. Third spiral end; 132b. Fourth spiral end; 200. Heating tube; 210. Inlet end; 220. Outlet end; 300. Exhaust gas purifier; 400. Switch solenoid valve; 500. Exhaust pipe; 510. First end; 520. Second end; 530. Third end; 600. Insulation component; 610. Insulation cloth; 620. Upper crossbeam; 630. Spring coil; 640. Fixing strip; 650. Side beam; 660. Suction cup. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention are within the scope of protection of the present invention.

[0037] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms "an" or "a" and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "connected" or "linked" and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up," "down," "left," "right," etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship also changes accordingly.

[0038] The following section will first combine the appendix. Figure 1-5 The hydraulic oil preheating device of this invention is described in detail in an embodiment of the present invention.

[0039] The hydraulic oil preheating device of the present invention includes an exhaust gas recovery pipe 100 and a heating pipe 200. The receiving port 110 of the exhaust gas recovery pipe 100 is connected to the exhaust port 002a of the engine 002 to receive exhaust gas. The heating pipe 200 is configured to be located at the oil inlet at the bottom of the hydraulic oil tank 001 to preheat the hydraulic oil. The air inlet 210 of the heating pipe 200 is connected to the exhaust port 120 of the exhaust gas recovery pipe 100 to introduce exhaust gas with a first temperature, which is used for heat exchange with the hydraulic oil. That is, as... Figure 1 As shown, the exhaust gas recovery pipe 100 is connected to the heating pipe 200. The exhaust gas discharged from the exhaust port 002a of the engine 002 is introduced into the heating pipe 200 located in the hydraulic oil tank 001 through the exhaust gas recovery pipe 100. The exhaust gas with a first temperature in the heating pipe 200 can exchange heat with the hydraulic oil, causing the temperature of the hydraulic oil to rise, thereby achieving preheating of the hydraulic oil. This invention improves the preheating efficiency by introducing the high-temperature exhaust gas (which can reach above 400°C) of the engine 002 into the heating pipe 200 to preheat the hydraulic oil.

[0040] For example, when the ambient temperature is -30℃, the hydraulic oil in the hydraulic oil tank 001 has poor fluidity and high viscosity due to the influence of the ambient temperature. However, the exhaust gas generated by the engine 002 during operation can reach a temperature of over 400℃. This high-temperature exhaust gas can be introduced into the heating pipe 200 installed in the hydraulic oil tank 001 through the exhaust gas recovery pipe 100. Thus, the exhaust gas with the first temperature can exchange heat with the hydraulic oil, thereby raising the temperature of the hydraulic oil and improving its fluidity.

[0041] It is worth noting that a filter component 001a is also provided at the oil inlet at the bottom of the hydraulic oil tank 001. Based on the consideration of maximizing preheating efficiency and saving space, the heating tube 200 can be formed into a spiral shape around the filter component 001a to increase the contact area between the exhaust gas and the hydraulic oil, thereby further improving the preheating efficiency.

[0042] As in some embodiments of the present invention, the receiving port 110 is configured to be positioned opposite the exhaust port of the engine 002. That is, as Figure 1 , Figure 3 As shown, the receiving port 110 of the exhaust gas recovery pipe 100 is connected to the corresponding end of the exhaust port of the engine 002, so that the exhaust gas discharged from the exhaust port 002a of the engine 002 can directly enter the exhaust gas recovery pipe 100, reducing heat loss and further improving preheating efficiency.

[0043] Furthermore, an exhaust gas purifier 300 for treating the received exhaust gas is provided on the side of the exhaust gas recovery pipe 100 near the receiving port 110. That is, as... Figure 1 , Figure 3As shown, it can be located on the side of the exhaust gas recovery pipe 100 near the receiving port 110 (corresponding to...) Figure 1 An exhaust gas purifier 300 is installed at the upper end of the engine (002) to treat the exhaust gas produced by the engine, thus preventing pollution and offering environmental advantages. Specifically, the exhaust gas purifier 300 can be, for example, a three-way catalytic converter. The three-way catalytic converter is the most important external purification device installed in the vehicle's exhaust system, which can remove CO, HC, and NO from the exhaust gas. x Harmful gases are transformed into harmless carbon dioxide, water, and nitrogen through oxidation and reduction, demonstrating excellent catalytic conversion effects.

[0044] A solenoid valve 400 for controlling the on / off state of exhaust gas is also installed at the outlet of the exhaust gas recovery pipe 100 near the exhaust gas purifier 300. That is to say, as... Figure 1 , Figure 3 As shown, a solenoid valve 400 is installed at the outlet of the exhaust gas recovery pipe 100 near the exhaust gas purifier 300. The solenoid valve 400 can be used to control whether the exhaust gas enters the heating pipe 200. A temperature sensor 001b is installed on the hydraulic oil tank 001 to detect the temperature of the hydraulic oil. The amount of exhaust gas entering the tank can be controlled according to the temperature of the hydraulic oil in the hydraulic oil tank 001 to improve the preheating effect of the hydraulic oil.

[0045] Furthermore, the hydraulic oil preheating device of this embodiment may further include an exhaust pipe 500, which is formed as a three-way pipe having a first end 510, a second end 520, and a third end 530. The first end 510 is connected to the outlet end 220 of the heating tube 200 to receive the exhaust gas after heat exchange, the second end 520 is used to connect to a vacuum pump to create a negative pressure in the heating tube 200, and the third end 530 is used to communicate with the atmospheric environment to discharge the exhaust gas after heat exchange. That is, as Figure 1 , Figure 2 As shown, the exhaust pipe 500 uses the first end 510 to receive the exhaust gas that has undergone heat exchange with the hydraulic oil in the heating pipe 200. Then, the exhaust gas is discharged into the atmosphere through the third end 530, which is connected to the atmosphere. A vacuum pump (not shown in the figure) is installed at the second end 520. When the vacuum pump is working, it can create a negative pressure in the heating pipe 200. On the one hand, it can guide the exhaust gas that has undergone heat exchange with the hydraulic oil to be discharged quickly from the heating pipe 200. On the other hand, it can promote the exhaust gas with the first temperature in the exhaust gas recovery pipe 100 to flow quickly into the heating pipe 200, thereby further improving the preheating efficiency of the hydraulic oil.

[0046] In a preferred embodiment of the present invention, the exhaust gas recovery pipe 100 further includes a temperature regulating section 130, which is configured to be disposed on the outer wall of the hydraulic oil tank 001. That is, as Figure 3As shown, before the exhaust gas enters the heating pipe 200, the temperature of the exhaust gas is regulated by the temperature regulation section 130 to avoid the hydraulic oil in the hydraulic oil tank 001 from overheating and vaporizing due to excessive exhaust gas temperature.

[0047] Further, the temperature regulating section 130 includes a first spiral tube 131 and a second spiral tube 132. The first spiral tube 131 has a first spiral end 131a and a second spiral end 131b. The first spiral tube 131 extends spirally from the first spiral end 131a towards the second spiral end 131b from the outside in, and the first spiral end 131a is connected to the exhaust port 120 of the exhaust gas recovery pipe 100. The second spiral tube 132 has a third spiral end 132a communicating with the second spiral end 131b and a fourth spiral end 132b connected to the air inlet end 210 of the heating pipe 200. The second spiral tube 132 extends spirally from the third spiral end 132a towards the fourth spiral end 132b from the inside out. The plane of the first spiral tube 131 is coplanar with the plane of the second spiral tube 132. That is, as... Figure 4 As shown, a temperature regulating section 130, including a first spiral tube 131 and a second spiral tube 132, is provided on the exhaust gas recovery pipe 100. The first spiral tube 131 and the second spiral tube 132 are connected, and the plane of the first spiral tube 131 and the plane of the second spiral tube 132 are coplanar. By extending the path of the exhaust gas into the heating pipe 200, heat loss occurs in the exhaust gas as it flows through the first spiral tube 131 and the second spiral tube 132, thereby further cooling the exhaust gas and ensuring that the preheated hydraulic oil has suitable viscosity and fluidity, further improving the preheating effect of the hydraulic oil.

[0048] It's worth noting that the initial temperature of the exhaust gas gradually decreases during its transport through the pipeline. By the time the exhaust gas reaches within 200 mm of the heating element, it has reached the second temperature. The second temperature needs to be selected based on the ambient temperature. When the ambient temperature is high, the second temperature should be set lower to prevent the hydraulic oil from overheating and vaporizing, which could have adverse effects. When the ambient temperature is low, the second temperature should be set higher to improve preheating efficiency. For example, the second temperature can be selected as 80℃, 75℃, 70℃, or 65℃ to ensure the hydraulic oil has suitable viscosity and fluidity.

[0049] Furthermore, the hydraulic oil preheating device of this embodiment may further include a heat insulation component 600, which is configured to be connected to the outer wall of the hydraulic oil tank 001. The heat insulation component 600 includes a heat insulation cloth 610, which is disposed above the temperature regulating section 130 or movably covers the outer periphery of the temperature regulating section 130 to regulate the temperature of the exhaust gas within the temperature regulating section 130. That is, as Figure 4 , Figure 5As shown, when setting the temperature regulation section 130, the path of the exhaust gas into the heating pipe 200 should be extended as much as possible to reduce the exhaust gas temperature to a lower level, thereby avoiding overheating of the hydraulic oil at higher ambient temperatures. However, when the ambient temperature is low, the longer path of the exhaust gas into the heating pipe 200 results in a lower exhaust gas temperature, affecting preheating efficiency and effect. By installing a heat insulation component 600 on the outer wall of the hydraulic oil tank 001 near the exhaust gas recovery pipe 100, the exhaust gas in the temperature regulation section 130 can be insulated, ensuring that the preheating device still has high preheating efficiency and good preheating effect at lower temperatures.

[0050] Specifically, an insulation cloth 610 is installed above the temperature regulating section 130. The insulation cloth 610 is positioned above the temperature regulating section 130 or can be movably covered on the outer periphery of the temperature regulating section 130. The insulation cloth 610 can be made of a material with a high silica coating to ensure good insulation performance. Figure 4 As shown, when the ambient temperature is high, the required exhaust gas temperature is low. Therefore, the insulation cloth 610 can be placed above the temperature regulating section 130 without covering it, allowing the exhaust gas to lose heat before flowing into the heating pipe 200, thus obtaining a lower exhaust gas temperature. Figure 5 As shown, when the ambient temperature is low, the required exhaust gas temperature is high. Therefore, the insulation cloth 610 can be pulled down to cover the outer periphery of the temperature regulating section 130. By adjusting the covering area of ​​the insulation cloth 610 and the temperature regulating section 130, the exhaust gas temperature can be precisely regulated, thereby improving the preheating effect of the hydraulic oil and enhancing the reliability of the hydraulic oil preheating device.

[0051] Furthermore, the insulation component 600 also includes an upper crossbeam 620 and a spring roller 630. The upper crossbeam 620 is located above the exhaust gas recovery pipe 100; the spring roller 630 is mounted on the upper crossbeam 620 and is configured for automatic rebound. One edge of the insulation cloth 610 is fixed to the rotating shaft of the spring roller 630, and at least a portion of the insulation cloth 610 is wound onto the rotating shaft. That is, as... Figure 4 , Figure 5As shown, the insulation cloth 610 is sequentially installed onto the outer wall of the hydraulic oil tank 001 via the spring reel 630 and the upper crossbeam 620. One edge of the insulation cloth 610 is fixed to the rotating shaft of the spring reel 630. At least a portion of the insulation cloth 610 is wound onto the rotating shaft, and the spring reel 630 has an automatic spring-back function. The automatic spring-back spring reel 630 can be, for example, the spring reel mechanism disclosed in patent CN 111827862 A. The spring reel 630 can realize the up and down sliding of the insulation cloth 610, and can also achieve a stop effect through the gear design. Applying a downward pulling force to the insulation cloth 610 releases the cloth, which is wound on the rotating shaft, thus covering the outer periphery of the temperature regulating section 130. Continuing to pull the insulation cloth 610 downward further increases the coverage area of ​​the insulation cloth 610 and the temperature regulating section 130. Removing the pulling force allows the insulation cloth 610 to automatically rewind back onto the rotating shaft of the spring roller 630, reducing the coverage area of ​​the insulation cloth 610 and the temperature regulating section 130 to zero. In short, by setting the spring roller 630, the coverage area of ​​the insulation cloth 610 and the temperature regulating section 130 can be flexibly adjusted, offering advantages of convenient and flexible operation.

[0052] Furthermore, the hydraulic oil preheating device of this embodiment may also include a fixing strip 640, which is connected to the other end of the insulation cloth 610. That is, as Figure 4 , Figure 5 As shown, a fixing strip 640 is provided at the other end of the insulation cloth 610. The fixing strip 640 can prevent the insulation cloth 610 from being completely rolled up onto the rotating shaft when the tension on the insulation cloth 610 is removed, thereby affecting the next operation and further improving the convenience of operation.

[0053] Furthermore, the hydraulic oil preheating device of this embodiment may further include two side beams 650, each side beam 650 being connected to the end of the upper crossbeam 620. The upper crossbeam 620 and the two side beams 650 surround the outer periphery of the exhaust gas recovery pipe 100. The end of the fixing strip 640 is provided with multiple suction cups 660, which can be adsorbed onto the side beams 650 at corresponding positions. That is, as... Figure 4 , Figure 5 As shown, a suction cup 660 can also be provided at the end of the fixing strip 640. When the insulation cloth 610 is pulled down so that the insulation cloth 610 and the temperature adjustment section 130 form the target coverage area, the suction force of the suction cup 660 fixes the fixing strip 640 to the side beam 650, thereby keeping the insulation cloth 610 in the target coverage position and further improving the convenience of operation.

[0054] The two side beams 650 are preferably equipped with scale lines that correspond to the ambient temperature, so that the operator can directly determine the adsorption position of the suction cup 660 by means of the ambient temperature.

[0055] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A hydraulic oil preheating device, characterized in that, include: An exhaust gas recovery pipe, wherein the receiving port of the exhaust gas recovery pipe is used to connect to the exhaust port of the engine to receive exhaust gas; A heating element is configured to be located at the oil inlet at the bottom of the hydraulic oil tank to preheat the hydraulic oil. The air inlet of the heating element is connected to the exhaust port of the exhaust gas recovery pipe to introduce exhaust gas with a first temperature, which is used for heat exchange with the hydraulic oil. The exhaust gas recovery pipe also includes a temperature regulating section, which is configured to be located on the outer wall of the hydraulic oil tank. A heat insulation component is configured to be connected to the outer wall of the hydraulic oil tank. The heat insulation component includes heat insulation cloth, which is disposed above the temperature regulating section or movably covers the outer periphery of the temperature regulating section to regulate the temperature of the exhaust gas within the temperature regulating section.

2. The hydraulic oil preheating device according to claim 1, characterized in that, The receiving port is configured to be positioned opposite the engine's exhaust port.

3. The hydraulic oil preheating device according to claim 1, characterized in that, The exhaust gas recovery pipe is equipped with an exhaust gas purifier for processing the received exhaust gas on the side near the receiving port. A solenoid valve for controlling the on / off state of the exhaust gas is also provided near the outlet of the exhaust gas purifier on the exhaust gas recovery pipe.

4. The hydraulic oil preheating device according to claim 1, characterized in that, Also includes: An exhaust pipe is formed as a three-way pipe having a first end, a second end, and a third end. The first end is connected to the outlet end of the heating tube to receive the exhaust gas after heat exchange. The second end is used to connect to a vacuum pump to create a negative pressure inside the heating tube. The third end is used to communicate with the atmospheric environment to discharge the exhaust gas after heat exchange.

5. The hydraulic oil preheating device according to claim 1, characterized in that, The temperature regulation section includes: A first spiral tube has a first spiral end and a second spiral end. The first spiral tube extends spirally from the first spiral end toward the second spiral end from the outside to the inside, and the first spiral end is connected to the exhaust port of the exhaust gas recovery pipe. The second spiral tube has a third spiral end communicating with the second spiral end and a fourth spiral end connected to the air inlet end of the heating tube, and the second spiral tube extends spirally from the third spiral end toward the fourth spiral end from the inside out. The plane containing the first spiral tube is coplanar with the plane containing the second spiral tube.

6. The hydraulic oil preheating device according to claim 1, characterized in that, The thermal insulation component also includes: The upper crossbeam is located above the exhaust gas recovery pipe; A spring reel is mounted on the upper crossbeam. The spring reel is configured to automatically rebound. One edge of the insulation cloth is fixed to the rotating shaft of the spring reel, and at least a portion of the insulation cloth is wound onto the rotating shaft.

7. The hydraulic oil preheating device according to claim 6, characterized in that, Also includes: A fixing strip is attached to the other end of the insulation cloth.

8. The hydraulic oil preheating device according to claim 7, characterized in that, Also includes: Two side beams are connected to the end of the upper crossbeam, and the upper crossbeam and the two side beams surround the outer periphery of the exhaust gas recovery pipe. The end of the fixing strip is provided with multiple suction cups, which can be adsorbed onto the side beams at corresponding positions.

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