Heating device for reduction gearbox of crane at low temperature

Abstract

The utility model discloses a heating device for a reduction gearbox of a crane at low temperature, which belongs to the technical field of crane design and comprises a heat insulation cover covering the periphery of the reduction gearbox, and one side of the heat insulation cover is fixedly connected with the crane. The heat preservation cover comprises a bottom plate, first side plates and second side plates, the bottom plate is arranged below the reduction gearbox, the first side plates are symmetrically arranged on the two sides of the reduction gearbox, the second side plates are arranged on the outer side of the reduction gearbox, the first side plates incline in the direction away from the reduction gearbox from bottom to top, and the second side plates incline in the direction away from the reduction gearbox from bottom to top. The inner wall surface of the first side plate faces the reduction gearbox; a plurality of heat tracing bands are fixedly arranged on the inner wall surfaces of the bottom plate and the first side plate; and the heat tracing band is connected to an electric cabinet through a temperature control switch. The device is simple in structure, high in heating efficiency and good in heat preservation performance, and the working efficiency of the crane in a low-temperature environment is improved.

Description

Technical Field

[0001] This utility model relates to the field of crane design technology, and in particular to a heating device for a crane gearbox at low temperatures. Background Technology

[0002] During crane operation, the gearbox is a critical component, and its performance stability and reliability are crucial to the normal operation of the entire equipment. However, in low-temperature environments, the lubricating oil inside the gearbox becomes viscous due to the lower temperature, resulting in poor fluidity and significantly reduced lubrication. This not only increases friction between internal components but can also lead to accelerated wear, reduced transmission efficiency, and even equipment malfunctions, severely impacting the crane's working efficiency and service life. Utility Model Content

[0003] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a heating device for a crane gearbox at low temperatures. This device has a simple structure, high heating efficiency, and good heat preservation performance, thereby improving the working efficiency of the crane in low-temperature environments.

[0004] This utility model provides a heating device for a crane gearbox at low temperatures, comprising an insulation cover surrounding the gearbox, one side of which is fixedly connected to the crane; the insulation cover includes a base plate, a first side plate, and a second side plate, the base plate being positioned below the gearbox, the first side plates being symmetrically arranged on both sides of the gearbox, and the second side plate being arranged on the outer side of the gearbox, the first side plates being inclined from bottom to top away from the gearbox, such that the inner wall surface of the first side plate faces the gearbox; a plurality of heating cables are fixedly arranged on the inner wall surfaces of the base plate and the first side plates; the heating cables are connected to an electrical control box via a temperature control switch.

[0005] Furthermore, each of the heat tracing cables is provided with a fixing clip, which is fixedly connected to the base plate or the first side plate by bolts.

[0006] Furthermore, the tracing heat packs on the base plate or the first side plate are evenly spaced.

[0007] Furthermore, several fixing plates are fixedly installed on the side of the base plate and the first side plate near the crane; the fixing plates are provided with waist-shaped holes for screws to pass through, and the fixing plates are fixedly connected to the crane by screws.

[0008] Furthermore, each of the two first side plates is provided with a top plate extending towards the gearbox.

[0009] Furthermore, the second side plate has an upward-facing through groove for tightly fitting it to the gearbox.

[0010] Furthermore, the base plate and the first side plate form an arc-shaped chamfer.

[0011] Furthermore, an insulation layer is fixedly provided on the inner wall surface of the insulation cover.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] This utility model provides a heating device for a crane gearbox at low temperatures. The heat preservation cover consists of a bottom plate, a first side plate, and a second side plate. The first side plate is inclined from bottom to top away from the gearbox, so that the inner wall surface faces the gearbox. This structural design not only provides a good installation position for the heat tracing cable, but also forms a relatively closed heat preservation space around the gearbox, effectively reducing heat loss and maintaining the stability of the internal temperature of the gearbox.

[0014] In this invention, the heat tracing cables evenly distributed on the inner walls of the base plate and the first side plate can ensure uniform heat distribution around the gearbox, avoid local overheating or insufficient heating, and enable the lubricating oil in the gearbox to heat up quickly and evenly at low temperatures, effectively reducing the viscosity of the lubricating oil, improving transmission efficiency, and ensuring the normal operation of the gearbox.

[0015] In this invention, the top plate at the top of the first side plate and the through groove design on the second side plate further enhance the tightness and stability of the fit between the insulation cover and the gearbox, enabling the insulation cover to better wrap the gearbox and reduce heat loss.

[0016] It should be understood that the description in this utility model description section is not intended to limit the key or essential features of the embodiments of this utility model, nor is it intended to restrict the scope of this utility model. Other features of this utility model will become readily apparent from the following description. Attached Figure Description

[0017] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0018] Figure 1 This is a structural schematic diagram of the crane;

[0019] Figure 2 This is a schematic diagram showing the fit between the protective cover and the gearbox.

[0020] Figure 3 This is a schematic diagram of the protective cover.

[0021] The following are labeled in the diagram: 1. Insulation cover, 11. Base plate, 12. First side plate, 13. Second side plate, 2. Heat tracing cable, 3. Electrical control box, 4. Fixing clip, 5. Fixing plate, 6. Top plate, 7. Through groove. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0023] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0024] Example 1

[0025] Please refer to Figures 1-3 This utility model provides a heating device for a crane gearbox under low temperature conditions, including a heat insulation cover 1 covering the gearbox. The heat insulation cover 1 is made of high-strength steel and has good structural strength and low temperature resistance. One side of the heat insulation cover 1 is fixedly connected to the crane, which can remain stable under the vibration generated by the crane operation and in harsh outdoor environments. The connection part is also rust-proofed to prevent rainwater from wetting it and causing rust.

[0026] The insulation cover 1 includes a base plate 11, a first side plate 12, and a second side plate 13. The base plate 11, the first side plate 12, and the second side plate 13 are welded together to form a semi-enclosed protective space. The joints are sealed to further enhance the airtightness of the insulation cover 1 and reduce the infiltration of cold air. The base plate 11 is located below the gearbox, and its size is slightly larger than the base of the gearbox. It not only provides solid support for the entire insulation cover 1 but also effectively blocks the cold air from the ground from penetrating the bottom of the gearbox.

[0027] The first side plate 12 is symmetrically arranged on both sides of the gearbox, and the second side plate 13 is arranged on the outer side of the gearbox. The first side plate 12 is inclined from bottom to top away from the gearbox, so that the inner wall surface of the first side plate 12 faces the gearbox. This inclined design maximizes the reflection of heat to the gearbox body and reduces the diffusion of heat to the external space.

[0028] Several heating cables 2 are fixedly installed on the inner wall surfaces of the base plate 11 and the first side plate 12. These heating cables 2 are self-limiting electric heating cables 2, which have the characteristic of automatically adjusting the output power. When the temperature rises to a certain upper limit, its resistance will increase and the output power will automatically decrease. This can effectively prevent damage to the gearbox caused by local overheating. The heating cables 2 can be reasonably distributed on the base plate 11 and the first side plate 12 according to the heat dissipation and heating requirements of different parts of the gearbox, so as to ensure that the gearbox can be heated comprehensively and evenly.

[0029] The heating cable 2 is connected to the electrical control box 3 via a temperature control switch. The temperature control switch uses a high-precision temperature sensor to monitor the gearbox temperature in real time. When the gearbox temperature falls below the set lower limit, the temperature control switch automatically closes, and the heating cable 2 is powered on to heat the gearbox. When the temperature rises to the set upper limit, the temperature control switch automatically opens, and the heating cable 2 stops heating. The electrical control box 3 is installed in a location easily accessible for operation and observation on the crane. It contains overload protection and short-circuit protection circuits, which can quickly cut off the power supply in case of a circuit fault in the heating cable 2, ensuring the safe operation of the device. Simultaneously, indicator lights are installed on the surface of the electrical control box 3 to clearly display the working status of the heating cable 2, allowing operators to monitor the device's operation in real time.

[0030] The above are the basic embodiments of this utility model. Further improvements, optimizations, and limitations can be made based on the above to obtain the following embodiments:

[0031] Example 2

[0032] This embodiment is an improvement on embodiment 1. Its main structure is the same as that of embodiment 1, but the improvement lies in:

[0033] like Figure 3 As shown, to ensure that the heating cable 2 maintains a stable installation state and heating effect during long-term use, each heating cable 2 is equipped with a fixing clip 4. These fixing clips 4 are made of 304 stainless steel and are integrally stamped, which has good low-temperature corrosion resistance and structural strength. The clamping part of the fixing clip 4 is designed as an arc-shaped groove structure. The inner diameter of the groove is precisely matched with the outer diameter of the heating cable 2, which can not only firmly hold the heating cable 2 to prevent its displacement, but also avoid damage to the insulation layer of the heating cable 2 due to excessive clamping.

[0034] The fixing clip 4 is fixedly connected to the base plate 11 or the first side plate 12 by bolts. After the bolts pass through the mounting holes at the bottom of the fixing clip 4, they engage with the internal threaded holes pre-set on the plate surface to tighten it.

[0035] The heat tracing cables 2 on the base plate 11 or the first side plate 12 are evenly spaced. Specifically, the heat tracing cables 2 on the base plate 11 are laid along the length of the gearbox, the center-line distance between two adjacent heat tracing cables 2 is strictly controlled at 200mm, and the distance between the outermost heat tracing cable 2 and the edge of the base plate 11 is maintained at 150mm, forming a uniformly covered heating area. The heat tracing cables 2 on the first side plate 12 are arranged in an inclined direction, with the same spacing of 200mm, to ensure uniform heating of the gearbox.

[0036] Example 3

[0037] This embodiment is an improvement on embodiment 1. Its main structure is the same as that of embodiment 1, but the improvement lies in:

[0038] like Figure 3 As shown, several fixing plates 5 are fixedly installed on the side of the base plate 11 and the first side plate 12 near the crane. These fixing plates 5 are connected to the base plate 11 and the first side plate 12 by welding. The weld joints are ground and rust-proofed to ensure connection strength and corrosion resistance. The number of fixing plates 5 is determined according to the size and weight of the insulation cover 1. Generally, 2-3 plates are set on the base plate 11 and 1-2 plates are set on each first side plate 12, evenly distributed to maintain uniform stress.

[0039] The fixing plate 5 has a waist-shaped hole for screws to pass through. This waist-shaped hole design has significant advantages. During installation, it can compensate for positional deviations caused by manufacturing and installation errors, allowing the insulation cover 1 to be finely adjusted within a certain range, ensuring that the insulation cover 1 can be accurately aligned with the gearbox, and also facilitating subsequent disassembly and maintenance.

[0040] The fixing plate 5 is fixedly connected to the crane by screws. In this utility model, high-strength stainless steel screws are selected, and the screw specifications are selected according to the actual stress conditions. Flat washers are used during installation to further enhance the firmness of the connection and prevent the screws from loosening due to vibration during crane operation.

[0041] Both of the first side plates 12 have a top plate 6 extending towards the gearbox. The top plate 6 is integrally molded with the first side plate 12 and is made of the same material. The design of the top plate 6 does not affect the normal operation of the gearbox, effectively blocks cold air from entering the insulation cover 1, and reflects the heat dissipated upwards by the heat tracing cable 2, thus improving the insulation effect. In addition, the top plate 6 can also prevent dust, rain, snow and other debris from falling directly onto the top of the gearbox, providing a certain degree of protection.

[0042] The second side plate 13 has an upward-facing through groove 7. The cross-sectional shape of the through groove 7 matches the shape of the corresponding part of the gearbox, and is generally arc-shaped. Its width and depth are precisely designed according to the size of the gearbox. The edges of the through groove 7 are polished to make them smoother and avoid scratching the surface of the gearbox. When the insulation cover 1 is installed in place, the corresponding part of the gearbox can be embedded in the through groove 7. The inner wall of the through groove 7 fits tightly against the surface of the gearbox, thereby minimizing the gap between the two and effectively preventing cold air from entering the interior of the insulation cover 1 from the side, thus enhancing the insulation's sealing performance.

[0043] Example 4

[0044] This embodiment is an improvement on embodiment 1. Its main structure is the same as that of embodiment 1, but the improvement lies in:

[0045] like Figure 3As shown, the base plate 11 and the first side plate 12 have an arc-shaped chamfer. This arc-shaped chamfer design has many advantages over a right-angle connection. On the one hand, it can avoid stress concentration and enhance the structural strength of the connection between the base plate 11 and the first side plate 12, making it less prone to damage when bearing the weight of the insulation cover 1 itself and external impact. On the other hand, the arc-shaped chamfer is easy to clean, reducing the accumulation of dust, oil and other debris, and also reducing the risk of personnel being scratched during installation and maintenance.

[0046] A heat insulation layer is fixedly installed on the inner wall of the heat insulation cover 1. In this invention, the heat insulation layer is made of aluminum silicate needle-punched blanket, which has good high-temperature resistance and heat insulation effect, can withstand the high temperature generated by the heat tracing cable 2 during operation, and effectively prevents heat from being transferred to the outside of the heat insulation cover 1. The heat insulation layer is firmly connected to the inner wall of the heat insulation cover 1 by a high-temperature resistant adhesive, ensuring that the heat insulation layer will not fall off during long-term use.

[0047] The heating device operates as follows: When the crane operates in a low-temperature environment, the electrical control box 3 is powered on, and the temperature control switch begins monitoring the gearbox temperature. If the gearbox temperature falls below the set lower limit, the temperature control switch closes, and the heating cable 2 is energized and heats up. The generated heat is concentrated and transferred to the gearbox through the reflection and insulation effect of the inner wall of the insulation cover 1 and the insulation layer, causing the gearbox temperature to gradually rise. As the temperature rises, when the set upper limit is reached, the temperature control switch opens, and the heating cable 2 stops heating. This cycle repeats continuously, ensuring the gearbox remains within a suitable operating temperature range and guaranteeing its normal operation.

[0048] In the description of this specification, the terms "connection," "installation," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0049] In the description of this specification, the terms "one embodiment," "some embodiments," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0050] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A heating device for a crane gearbox operating at low temperatures, characterized in that, The system includes an insulation cover (1) surrounding the gearbox, one side of which is fixedly connected to the crane. The insulation cover (1) includes a base plate (11), a first side plate (12), and a second side plate (13). The base plate (11) is located below the gearbox. The first side plate (12) is symmetrically arranged on both sides of the gearbox, and the second side plate (13) is arranged on the outer side of the gearbox. The first side plate (12) is inclined from bottom to top away from the gearbox, so that the inner wall surface of the first side plate (12) faces the gearbox. Several heating cables (2) are fixedly arranged on the inner wall surfaces of the base plate (11) and the first side plate (12). The heating cables (2) are connected to the electrical control box (3) through a temperature control switch.

2. The heating device for a crane gearbox under low temperature conditions according to claim 1, characterized in that, Each of the heat tracing cables (2) is provided with a fixing clip (4), which is fixedly connected to the base plate (11) or the first side plate (12) by bolts.

3. The heating device for a crane gearbox under low temperature conditions according to claim 2, characterized in that, The tracing cables (2) on the base plate (11) or the first side plate (12) are evenly spaced.

4. The heating device for a crane gearbox under low temperature conditions according to claim 1, characterized in that, The base plate (11) and the first side plate (12) are fixedly provided with a number of fixing plates (5) on the side close to the crane; the fixing plates (5) are provided with waist-shaped holes for screws to pass through, and the fixing plates (5) are fixedly connected to the crane by screws.

5. The heating device for a crane gearbox under low temperature conditions according to claim 1, characterized in that, The top of each of the two first side plates (12) is provided with a top plate (6) extending toward the gearbox.

6. The heating device for a crane gearbox under low temperature conditions according to claim 1, characterized in that, The second side plate (13) has an upward-facing through groove (7) for tightly fitting it to the gearbox.

7. The heating device for a crane gearbox under low temperature conditions according to claim 1, characterized in that, The base plate (11) and the first side plate (12) have an arc-shaped chamfer.

8. The heating device for a crane gearbox under low temperature conditions according to claim 1, characterized in that, The inner wall of the heat insulation cover (1) is fixedly provided with a heat insulation layer.

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