CN110878771A

CN110878771A - Hydraulic oil tank and engineering machinery

Info

Publication number: CN110878771A
Application number: CN201911206860.XA
Authority: CN
Inventors: 刘晓
Original assignee: Shanghai 31 Heavy Machine Ltd By Share Ltd
Current assignee: Shanghai 31 Heavy Machine Ltd By Share Ltd; Shanghai Sany Heavy Machinery Co Ltd
Priority date: 2019-11-29
Filing date: 2019-11-29
Publication date: 2020-03-13
Anticipated expiration: 2039-11-29
Also published as: CN110878771B

Abstract

The invention provides a hydraulic oil tank and engineering machinery, and relates to the technical field of engineering machinery. Hydraulic tank includes the box and sets up sliding platform and heating device in the box, sliding platform sliding connection just can be for the box along first direction removal of predetermineeing, sliding platform is provided with along the second predetermines the first grooved rail of direction and along the second grooved rail that the third predetermines the direction extension, first grooved rail and second grooved rail cross each other, heating device sliding connection predetermines the direction in order can relative sliding platform along the second in first grooved rail or second grooved rail and the third and predetermines the direction removal, the second predetermines the direction and the third predetermines the equal perpendicular to of direction first predetermineeing the direction. The engineering machinery comprises the hydraulic oil tank. The oil in the hydraulic oil tank is heated more uniformly, and the phenomenon of local overhigh oil temperature is avoided, so that the normal work of the engineering machinery is prevented from being influenced.

Description

Hydraulic oil tank and engineering machinery

Technical Field

The invention relates to the technical field of engineering machinery, in particular to a hydraulic oil tank and engineering machinery.

Background

The hydraulic oil tank is often arranged in engineering machinery such as an excavator and the like to provide circulating hydraulic oil for a hydraulic system. Generally, a heating device is required to be arranged in a hydraulic mailbox to heat hydraulic oil, so that the normal work of a hydraulic system is prevented from being influenced by the excessively low temperature of the hydraulic oil. However, the oil in the existing hydraulic oil tank is heated unevenly, and the phenomenon of local over-high oil temperature is easy to occur, so that the normal work of the engineering machinery is influenced.

Disclosure of Invention

The invention aims to provide a hydraulic oil tank and engineering machinery, wherein oil in the hydraulic oil tank is heated more uniformly, and the phenomenon of local overhigh oil temperature is avoided, so that the normal work of the engineering machinery is prevented from being influenced.

Embodiments of the invention may be implemented as follows:

in a first aspect, an embodiment provides a hydraulic oil tank, including the box and set up sliding platform and heating device in the box, sliding platform sliding connection is in the box and can remove along first predetermined direction for the box, sliding platform is provided with along the second predetermined direction first grooved rail and along the third predetermined direction second grooved rail that extends, first grooved rail and second grooved rail cross each other, heating device sliding connection is in first grooved rail or second grooved rail and in order to remove along second predetermined direction and third predetermined direction relative sliding platform, the second predetermined direction and the third predetermined direction all are perpendicular to first predetermined direction.

In an alternative embodiment, the second predetermined direction and the third predetermined direction are perpendicular.

In an alternative embodiment, the heating device comprises a bracket and a heating rod fixed to the bracket, the bracket being slidably connected to the first or second grooved rail.

In an alternative embodiment, the bracket comprises a fixed section and a folding section rotatably connected to the fixed section, the fixed section is slidably connected to the first grooved rail or the second grooved rail, the heating rod is arranged at the folding section, and the folding section can rotate towards a direction close to or far away from the fixed section.

In an optional implementation mode, the hydraulic oil tank comprises a controller, the support is electrically connected with the controller, the tank body is provided with an oil outlet pipe, the oil outlet pipe is provided with a temperature sensor used for detecting the oil temperature, the temperature sensor is electrically connected with the controller, and when the oil temperature detected by the temperature sensor exceeds a preset value, the controller controls the folding section to rotate towards the direction close to the fixed section so as to drive the heating rod to separate from the oil liquid.

In an alternative embodiment, a position sensor for detecting the position of the heating rod is provided on the support, and the position sensor is electrically connected to the controller.

In an alternative embodiment, the tank is provided with a level sensor for detecting the level of the oil, the level sensor being electrically connected to the controller.

In an alternative embodiment, the hydraulic tank comprises two heating devices, one of which is slidably connected to the first channel rail and the other of which is slidably connected to the second channel rail.

In an alternative embodiment, the hydraulic reservoir includes an agitator, the heating device is slidably connected to the first channel rail, and the agitator is slidably connected to the second channel rail.

In a second aspect, an embodiment provides a working machine, which includes the above hydraulic oil tank.

The embodiment of the invention has the beneficial effects that:

hydraulic tank includes the box and sets up sliding platform and heating device in the box, sliding platform sliding connection just can be for the box along first direction removal of predetermineeing, sliding platform is provided with along the second predetermines the first grooved rail of direction and along the second grooved rail that the third predetermines the direction extension, first grooved rail and second grooved rail cross each other, heating device sliding connection predetermines the direction in order can relative sliding platform along the second in first grooved rail or second grooved rail and the third and predetermines the direction removal, the second predetermines the direction and the third predetermines the equal perpendicular to of direction first predetermineeing the direction. The engineering machinery comprises the hydraulic oil tank. The heating device is arranged on the sliding platform, the sliding platform is connected to the box body in a sliding mode and can move along a first preset direction relative to the box body, so that the position of the heating device in the first preset direction can be adjusted by driving the heating device to move, meanwhile, the sliding platform is provided with a first groove rail in a second preset direction and a second groove rail extending in a third preset direction, the heating device is connected to the first groove rail or the second groove rail in a sliding mode, the first groove rail and the second groove rail are intersected with each other, so that the heating device can move along the second preset direction and the third preset direction relative to the sliding platform, corresponding positions can be adjusted, the position of the heating device in the hydraulic oil tank can be adjusted in multiple dimensions in the box body, oil liquid in different positions can be heated, and the problem that heating is uneven or local temperature is overhigh due to heating in fixed positions is avoided, the oil liquid is heated more evenly, and the influence on the normal work of the engineering machinery is avoided.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a schematic structural view of a hydraulic oil tank in an unfolded state of a bracket according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of the hydraulic oil tank in a folded state of the support in the embodiment of the invention.

Icon: 100-a hydraulic oil tank; 110-a box body; 112-a slide rail; 113-a liquid level sensor; 114-an oil outlet pipe; 115-a temperature sensor; 116-oil return pipe; 130-a sliding platform; 132-a first groove track; 134-a second groove track; 150-a heating device; 152-a scaffold; 154-a heating rod; 155-a fixed segment; 156-a folding section; 157-position sensor.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. indicate an orientation or a positional relationship based on that shown in the drawings or that the product of the present invention is used as it is, this is only for convenience of description and simplification of the description, and it does not indicate or imply that the device or the element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.

Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.

Referring to fig. 1, the present embodiment provides a hydraulic oil tank 100, which includes a tank body 110, and a sliding platform 130 and a heating device 150 disposed in the tank body 110. The sliding platform 130 is slidably connected to the box 110 and can move along a first predetermined direction (shown as ab direction) relative to the box 110. The sliding platform 130 is provided with a first slot rail 132 along a second preset direction (shown in the figure cd direction) and a second slot rail 134 extending along a third preset direction (shown in the figure ef direction), the first slot rail 132 and the second slot rail 134 intersect with each other, and the heating device 150 is slidably connected to the first slot rail 132 or the second slot rail 134 so as to be capable of moving along the second preset direction (shown in the figure cd direction) and the third preset direction (shown in the figure ef direction) relative to the sliding platform 130. The second predetermined direction (cd shown) and the third predetermined direction (ef shown) are perpendicular to the first predetermined direction.

The box body 110 is a rectangular parallelepiped structure, and includes a first sidewall, a second sidewall, a third sidewall, and a fourth sidewall that are vertically connected in sequence. In the box 110, a sliding rail 112 is disposed on a side of the first sidewall close to the second sidewall and a side of the first sidewall close to the fourth sidewall, a sliding rail 112 is disposed on a side of the third sidewall close to the second sidewall and a side of the third sidewall close to the fourth sidewall, and the sliding rail 112 extends along a first predetermined direction (shown as ab direction). The first predetermined direction (shown as ab direction) is the height direction of the case 110. Thus, slide rails 112 are provided at the four corner folds of the case 110. The four corners of the sliding platform 130 are correspondingly slidably engaged with the sliding rails 112, so that the sliding platform 130 can be moved along a first predetermined direction (shown as ab direction) relative to the box 110 to adjust the position of the sliding platform 130. To ensure that the sliding platform 130 is always above the oil level of the oil, a limiting member is disposed on the sliding rail 112 to limit the total length of the stroke of the sliding platform 130 in a first predetermined direction (shown as ab direction). In addition, the tank 110 is provided with a liquid level sensor 113 for detecting the height of the oil level, in this embodiment, the liquid level sensor 113 may be a float-type liquid level meter, the plunger is fixed to the tank 110, and the float floats on the oil level for liquid level detection. In other embodiments, the liquid level sensor 113 may also be a drop-in type liquid level sensor, and one side of the drop-in type liquid level sensor is fixed on the tank 110, and it is required that the liquid level sensor 113 is always located below the oil level of the oil in the tank 110. The tank 110 is provided with an oil outlet pipe 114 through which the oil supply liquid flows out from the tank 110, and the oil outlet pipe 114 is provided with a temperature sensor 115 for detecting the oil temperature, so that the oil outlet temperature of the hydraulic oil tank 100 can be monitored. Meanwhile, the tank 110 is further provided with an oil return pipe 116 through which oil enters the tank 110, the oil return pipe 116 and the oil outlet pipe 114 are arranged at intervals, and the oil return pipe 116 is also provided with a temperature sensor 115 for detecting the oil temperature, so that the temperature of the oil entering and exiting the whole hydraulic oil tank 100 can be monitored to grasp the overall temperature condition of the circulating oil in the hydraulic oil tank 100.

In this embodiment, the sliding platform 130 is a rectangular sliding plate, and four corners of the sliding plate in the circumferential direction are respectively provided with sliding parts which are matched with the sliding rails 112, so that the sliding platform 130 can slide relative to the box body 110. And a driving piece and a braking piece are arranged on the sliding piece, the driving piece is used for driving the sliding piece to move, and the braking piece is used for stopping the sliding piece from moving. In other embodiments, the sliding platform 130 may be a frame structure to reduce the weight, only the frame is required to be able to carry the first and

second groove rails

132 and 134.

The sliding platform 130 is provided with a first grooved rail 132 and a second grooved rail 134 which meet each other on the side close to the oil. In the present embodiment, the second predetermined direction (cd shown) and the third predetermined direction (ef shown) are perpendicular, so that the first slot rail 132 and the second slot rail 134 form a cross shape on the sliding platform 130, the second predetermined direction (cd shown) is parallel to the width direction of the box 110, and the third predetermined direction (ef shown) is parallel to the length direction of the box 110. In other embodiments, the second predetermined direction (cd shown) and the third predetermined direction (ef shown) may not be perpendicular, but only an angle is formed therebetween to enable the two-dimensional extension on the plane of the sliding platform 130 perpendicular to the first predetermined direction (ab shown) to enable the heating device 150 to perform multi-dimensional movement. In other embodiments, a third groove rail may be disposed on the sliding platform 130, and the third groove rail intersects with the first groove rail 132 and the second groove rail 134, so that the heating device 150 can be moved in multiple dimensions, and only needs to be disposed according to actual needs.

In this embodiment, the heating device 150 includes a bracket 152 and a heating rod 154 fixed to the bracket 152, the bracket 152 is slidably connected to the first slot rail 132 or the second slot rail 134, and the first slot rail 132 and the second slot rail 134 meet, so that the bracket 152 can move the heating rod 154 on the first slot rail 132 and the second slot rail 134. The heating rod 154 is an electrical heating rod. The bracket 152 and the heating rod 154 are both located on the side of the sliding platform 130 near the oil. When heating the oil, the sliding platform 130 needs to be adjusted to a proper position to ensure that the heating rod 154 of the heating device 150 can be immersed in the oil to heat the oil. In other embodiments, the heating device 150 may also include a heat exchange tube, a sliding member is fixed on the heat exchange tube to be in sliding fit with the first and

second groove rails

132 and 134, and an inlet tube and an outlet tube which are communicated with the heat exchange tube may be fixed on the box 110, at this time, it is required to ensure that the inlet tube and the outlet tube are elastic tubes and are always located above the oil level, so that the inlet tube and the outlet tube can be stretched and contracted to change the length when the heat exchange tube is moved in three dimensions, thereby adapting to different positions of the heat exchange tube, and ensuring that the inlet tube can always provide a heat medium for the heat exchange.

Referring to fig. 2, in the present embodiment, to further improve the flexibility of the heating device 150, the bracket 152 includes a fixed section 155 and a folding section 156 rotatably connected to the fixed section 155. The fixed section 155 is slidably connected to the first or second

grooved rail

132 or 134, and the fixed section 155 is provided with a driving member and a braking member to drive the bracket 152 to move and to brake the bracket 152. The heating rod 154 is disposed at the folding section 156, and the folding section 156 can rotate toward or away from the fixing section 155. That is, when the folding section 156 rotates towards the direction close to the fixed section 155, the bracket 152 is folded, and the folding section 156 drives the heating rod 154 to move towards the direction close to the fixed section 155, that is, towards the direction close to the sliding platform 130 to retract the heating rod 154, so that the heating rod 154 can be separated from the oil liquid when necessary, and the heating of the oil liquid is stopped. Specifically, a gear engagement mechanism may be provided between the folding section 156 and the fixing section 155, and the rotation of the folding section 156 is achieved by the gear engagement mechanism. In other embodiments, the bracket 152 may not include the folded section 156, and when the heating rod 154 needs to be retracted, the sliding platform 130 is moved directly to bring the heating rod 154 away from the oil surface. In the present embodiment, the angle between the folding section 156 and the fixing section 155 is 90 ° in the folded state of the bracket 152. In other embodiments, the angle between the folding section 156 and the fixing section 155 in the folded state can be set according to actual requirements. In addition, a position sensor 157 for detecting the position of the heating rod 154 is provided on the holder 152 to detect the position of the heating rod 154 within the case 110.

To achieve centralized control, the hydraulic oil tank 100 includes a controller. Each slider of the sliding platform 130 is electrically connected to the controller, so that the controller can control the driving element and the braking element on the slider to synchronously start and stop each slider, thereby controlling the sliding platform 130 to move in the first preset direction (shown as ab direction) to adjust the position of the sliding platform 130 in the first preset direction (shown as ab direction), and simultaneously ensuring that the sliding platform 130 is substantially horizontal. The bracket 152 is electrically connected to a controller, and the controller can control the operation of a driving member and a braking member on the bracket 152 to control the movement of the bracket 152 on the first and second

grooved rails

132 and 134, so as to adjust the position adjustment of the heating rod 154 on the three-dimensional space in the box 110, so as to heat oil at different positions. And the position sensor 157 is electrically connected to the controller to transmit the position information of the bracket 152 to the controller.

The gear engagement mechanism between the folding section 156 and the fixing section 155 is electrically connected to the controller, so that the controller can control the rotation of the folding section 156 to control whether the bracket 152 is folded or not. A temperature sensor 115 provided on the outlet pipe 114 is electrically connected to the controller to transmit outlet oil temperature information of the hydraulic oil tank 100 to the controller. When the oil temperature detected by the temperature sensor 115 exceeds a preset value, the controller controls the folding section 156 to rotate towards the direction close to the fixed section 155 to drive the heating rod 154 to be separated from the oil; when the oil temperature detected by the temperature sensor 115 does not exceed the preset value, the controller controls the folding section 156 to rotate away from the fixed section 155 to lower the heating rod 154 to extend into the oil to heat the oil. A temperature sensor 115 on the return line 116 may also be electrically connected to the controller to reflect the temperature profile of the overall oil circulation of the hydraulic reservoir 100.

In addition, a fluid level sensor 113 is electrically connected to the controller to transmit a fluid level signal to the controller. When the liquid level sensor 113 detects that the position of the oil level is lower than the preset value, the hydraulic oil tank 100 cannot normally work and needs to be oiled, and the oil does not need to be heated. To avoid wasting energy, the controller can control the foldable section 156 to rotate toward the direction close to the fixed section 155 to drive the heating rod 154 to be separated from the oil, thereby stopping the energy consumption of the oil, and when enough oil is supplied, the controller can control the foldable section 156 to rotate toward the direction away from the fixed section 155 to put down the heating rod 154 to extend into the oil to heat the oil.

In addition, the heating rod 154 may also be electrically connected to the controller, such that the controller can control whether the heating rod 154 turns on heating. When the heating rod 154 is accidentally out of order and heating is stopped under the control of the controller, the controller can control the bracket 152 to fold to take the heating rod 154 out of the oil, so that the controller can control the bracket 152 to fold as an emergency treatment of the heating rod 154 failure.

It is understood that in other embodiments, the hydraulic oil tank 100 may further include two heating devices 150, one heating device 150 being slidably connected to the first grooved rail 132, and the other heating device 150 being slidably connected to the second grooved rail 134. The two heating devices 150 are electrically connected with the controller, and the controller respectively controls the displacement and the heating of the two heating devices 150 and can realize alternate heating.

In other embodiments, to further accelerate the heat transfer and make the temperature of the oil uniform, the hydraulic oil tank 100 may further include an agitator, the heating device 150 is slidably connected to the first grooved rail 132, the agitator is slidably connected to the second grooved rail 134, and the agitator is electrically connected to the controller. Thus, when the heating device 150 extends into the oil liquid for heating, the stirrer also can extend into the oil liquid, and the controller can control the stirrer to stir, so that the oil liquid flows and is mixed, and the heating is more uniform. Set up the agitator respectively with heating device 150 on the grooved rail of difference, can avoid the agitator setting to interfere with each other or appear colliding with heating device 150, and can have certain spacing distance between agitator setting and the heating device 150, more conveniently take heating device 150's heat to farther fluid position for heat transfer, thereby guarantee the normal work of hydraulic tank 100 and engineering machine tool with heating efficiency.

The embodiment also provides a construction machine, which comprises a hydraulic oil tank 100, wherein the hydraulic oil tank 100 is used for circularly providing hydraulic oil for a hydraulic system of the construction machine. The controller may be provided in the hydraulic oil tank 100, or may be provided in a control cabinet of the construction machine, and may be provided only as needed.

The working principle of the hydraulic oil tank 100 is as follows:

when the temperature sensor 115 disposed on the oil outlet pipe 114 detects that the oil temperature of the oil does not exceed the preset value, the controller controls the sliding platform 130 to move to a proper position and controls the bracket 152 to drive the heating rod 154 to move to one end of the first grooved rail 132 on the first grooved rail 132, so that the heating rod 154 extends into the oil. The controller controls the heating rod 154 to turn on the heating.

After heating for a certain time, the controller controls the bracket 152 to move along the first grooved rail 132 and move to one end of the second grooved rail 134 through the intersection of the first grooved rail 132 and the second grooved rail 134, so as to perform timed heating. Then, the controller controls the bracket 152 to move to the intersection along the second slot rail 134 and then to move to the other end of the first slot rail 132 along the first slot rail 132, so as to perform the timed heating. Then, the controller controls the bracket 152 to move to the intersection along the first slot rail 132 and then move to the other end of the second slot rail 134 along the second slot rail 134 for timing heating. Finally, the controller controls the bracket 152 to return to the original position. Therefore, the heating rod 154 heats all four sides of the interior of the box 110, so that the temperature of the oil is uniform, a heating cycle is completed, the heating efficiency is improved, and the normal operation of the hydraulic oil tank 100 is prevented from being influenced by overhigh local temperature.

In the whole heating process, when the oil temperature detected by the temperature sensor 115 exceeds the preset value, the controller can control the heating rod 154 to stop heating at any time, and the controller can also control the folding section 156 to rotate towards the direction close to the fixed section 155 to drive the heating rod 154 to separate from the oil, so that the heating is stopped, and the normal operation of the hydraulic oil tank 100 is prevented from being influenced by overhigh temperature. Meanwhile, the liquid level sensor 113 can monitor the oil level in real time.

The engineering machine comprises a hydraulic oil tank 100, the hydraulic oil tank 100 is connected to a tank body 110 in a sliding manner by a sliding platform 130, and can move along a first preset direction (shown as ab direction) relative to the tank body 110, meanwhile, the sliding platform 130 is provided with a first groove rail 132 along a second preset direction (shown as cd direction) and a second groove rail 134 extending along a third preset direction (shown as ef direction), and a heating device 150 is connected to the first groove rail 132 and the second groove rail 134 which are intersected with each other in a sliding manner, so that the heating device 150 can be driven to move to adjust the positions of the heating device 150 in the first preset direction (shown as ab direction), the second preset direction (shown as cd direction) and the third preset direction (shown as ef direction), and the position of the heating device 150 in the hydraulic oil tank 100 in the tank body 110 can be adjusted in the multi-dimensional direction, so as to heat oil in different positions, the problem that heating is uneven or local temperature is too high due to the fact that heating is carried out at a fixed position is avoided, oil liquid is heated more uniformly, and normal work of engineering machinery is prevented from being influenced.

The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. The utility model provides a hydraulic tank, its characterized in that, include the box and set up in sliding platform and heating device in the box, sliding platform sliding connection in the box and can for the box removes along first predetermined direction, sliding platform is provided with along the second predetermine the first grooved rail of direction and along the third predetermine the second grooved rail that the direction extends, first grooved rail with the second grooved rail crosses each other, heating device sliding connection in first grooved rail or the second grooved rail is in order to be relative sliding platform follows the second predetermines the direction with the third predetermines the direction and removes, the second predetermine the direction with the third predetermines the equal perpendicular to of direction first predetermined direction.

2. A hydraulic tank according to claim 1, characterized in that said second preset direction and said third preset direction are perpendicular.

3. The hydraulic tank of claim 1, wherein the heating device comprises a bracket and a heating rod fixed to the bracket, and the bracket is slidably connected to the first or second grooved rail.

4. The hydraulic oil tank as claimed in claim 3, wherein the bracket comprises a fixed section and a folding section rotatably connected to the fixed section, the fixed section is slidably connected to the first groove rail or the second groove rail, the heating rod is disposed at the folding section, and the folding section can rotate towards or away from the fixed section.

5. The hydraulic tank of claim 4, wherein the hydraulic tank comprises a controller, the bracket is electrically connected with the controller, the tank body is provided with an oil outlet pipe, the oil outlet pipe is provided with a temperature sensor for detecting the temperature of oil, the temperature sensor is electrically connected with the controller, and when the temperature of the oil detected by the temperature sensor exceeds a preset value, the controller controls the folding section to rotate towards the direction close to the fixed section so as to drive the heating rod to be separated from the oil.

6. The hydraulic oil tank as claimed in claim 5, wherein a position sensor for detecting the position of the heating rod is provided on the bracket, and the position sensor is electrically connected to the controller.

7. The hydraulic oil tank as claimed in claim 5, wherein the tank body is provided with a level sensor for detecting an oil level, the level sensor being electrically connected to the controller.

8. A hydraulic tank as claimed in claim 1, characterized in that it comprises two of said heating devices, one of which is slidingly connected to said first grooved rail and the other of which is slidingly connected to said second grooved rail.

9. A hydraulic tank as claimed in claim 1, characterized in that it comprises an agitator, the heating device being slidingly connected to the first gutter rail, the agitator being slidingly connected to the second gutter rail.

10. A working machine, characterized by comprising a hydraulic tank according to any one of claims 1-9.