Track tensioning system and engineering machinery

Abstract

The utility model relates to the technical field of engineering machinery, and discloses a track tensioning system and engineering machinery. The track tensioning system includes: a hydraulic oil source; the reversing valve is provided with a first working position where the oil inlet is communicated with the oil outlet and a second working position where the oil inlet is not communicated with the oil outlet; an oil inlet of the proportional pressure reducing valve is communicated with an oil outlet of the reversing valve; the tensioning oil cylinder is provided with a rodless cavity and a rod cavity, and the rodless cavity is communicated with an oil outlet of the proportional pressure reducing valve; the pressure detection piece is used for detecting the pressure of the rodless cavity; the control unit is electrically connected with the reversing valve, the proportional pressure reducing valve and the pressure detection part, and is used for controlling the working position of the reversing valve and the set pressure of the proportional pressure reducing valve according to the environmental working condition and the pressure detected by the pressure detection part, controlling the pressure of hydraulic oil in the tensioning oil cylinder, and automatically and accurately controlling the tensioning degree of the crawler belt. Operators do not need to manually adjust the tightness degree of the crawler belt, the labor intensity of the operators is reduced, and the working time is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of engineering machinery, in particular to a crawler tensioning system and engineering machinery. Background Art

[0002] With the standardization of infrastructure construction, agricultural development and other projects, the target market for construction machinery is becoming more and more segmented, the operating conditions are becoming more and more complex, the construction scope is becoming wider and wider, the implementation period is becoming shorter and shorter, and the working time of the whole machine is becoming longer and longer. How to reduce the labor intensity of drivers in maintaining the whole machine, the whole machine failure rate, and improve the whole machine attendance rate and work efficiency has become an important issue.

[0003] Existing engineering machinery such as crawler skid steer loaders include a crawler track tensioning system, which consists of a crawler track and a tensioning cylinder. The operator needs to manually inject grease into the tensioning cylinder through the grease nipple on the tensioning cylinder to adjust the tightness of the crawler track. The grease enters the large cavity of the tensioning cylinder through the grease injection hole, and the pressure in the tensioning cylinder rises. The piston of the tensioning cylinder is rigidly connected to the lower frame of the skid steer loader, thereby pushing the crawler track to achieve the purpose of tensioning, and then adjusting the tightness of the track.

[0004] Operators need to manually grease or release the track according to the working conditions and the track tension, and adjust the track tension progress, which increases the operator's labor intensity and delays production time. If the operator forgets to grease the track, it will cause the track to become too loose and fall off, which will cause the entire machine to stop. Utility Model Content

[0005] In view of this, the utility model provides a crawler track tensioning system and engineering machinery to solve the problem that operators manually adjust the crawler track tension, which increases the operator's labor intensity and wastes working time.

[0006] In the first aspect, the utility model provides a track tensioning system, comprising: a hydraulic oil source for providing hydraulic oil; a reversing valve, having a first working position in which its oil inlet and oil outlet are connected, and the reversing valve also having a second working position in which its oil inlet and oil outlet are not connected; a proportional pressure reducing valve, the oil inlet of the proportional pressure reducing valve is connected to the oil outlet of the reversing valve; a tensioning cylinder, having a rodless chamber and a rod chamber, the rodless chamber is connected to the oil outlet of the proportional pressure reducing valve, and the tensioning cylinder is used to adjust the tensioning force of the track; a pressure detecting element for detecting the pressure of the rodless chamber; a control unit, electrically connected to the reversing valve, the proportional pressure reducing valve, and the pressure detecting element, the control unit being used to control the working position of the reversing valve and the set pressure of the proportional pressure reducing valve according to the environmental working conditions and the pressure detected by the pressure detecting element.

[0007] Beneficial effect: The pressure detection component detects the pressure of the rodless chamber of the tensioning cylinder in real time and feeds back the pressure value to the control unit. The control unit controls the set pressure of the proportional pressure reducing valve and the working position of the reversing valve based on the pressure detection component and the environmental conditions, thereby controlling the pressure of the hydraulic oil in the tensioning cylinder, thereby realizing automatic and precise control of the track tension. There is no need for the operator to manually adjust the tightness of the track, which reduces the labor intensity of the operator, saves working time, and improves production efficiency. It effectively solves the problem of the operator manually adjusting the tightness of the track, which increases the labor intensity of the operator and wastes working time.

[0008] In an optional embodiment, when the pressure detected by the pressure detection component is less than the set value corresponding to the environmental working conditions, the control unit controls the reversing valve to be in the first working position; when the pressure detected by the pressure detection component is greater than or equal to the set value corresponding to the environmental working conditions, the control unit controls the reversing valve to be in the second working position.

[0009] Beneficial Effects: By precisely controlling the pressure entering the tensioning cylinder, mechanical damage or premature wear caused by excessive pressure can be avoided, while loosening of the track caused by insufficient pressure can also be prevented.

[0010] In an optional embodiment, the environmental working conditions include soft working conditions, standard working conditions and hard working conditions. The set values ​​corresponding to the soft working conditions, standard working conditions and hard working conditions are different, and the set pressure of the proportional pressure reducing valve varies with the different environmental working conditions.

[0011] Beneficial effect: Under different working conditions, the required tension of the track may vary. The proportional pressure reducing valve can be flexibly adjusted according to the actual situation, so that the machine can maintain a good operating state under various working conditions and can adapt to different working conditions.

[0012] In an optional embodiment, the track tensioning system also includes an overflow valve, which is connected to the rodless chamber. When the pressure detected by the pressure detection component is greater than the set value corresponding to the environmental working conditions, the control unit controls the overflow valve to open until the pressure detected by the pressure detection component reaches the set value corresponding to the environmental working conditions.

[0013] Beneficial effect: When the pressure in the tensioning cylinder is high, the control unit controls the overflow valve to open, and the hydraulic oil in the tensioning cylinder is relieved through the overflow valve to prevent mechanical damage or premature wear caused by excessive pressure, thereby extending the service life of the tensioning system.

[0014] In an optional embodiment, the hydraulic oil source includes a main pump and an oil tank, the oil inlet of the reversing valve is connected to the oil outlet of the main pump, the oil inlet of the main pump is connected to the oil tank, the oil return port of the overflow valve and the oil return port of the proportional pressure reducing valve are connected to the oil tank, and the main pump is used to connect to the travel motor.

[0015] Beneficial effects: The main pump is used to provide power for the tensioning cylinder, thereby achieving multi-tasking processing, simplifying the structure and reducing costs.

[0016] In an optional embodiment, the hydraulic oil source includes an oil replenishment pump and an oil tank, the oil inlet of the reversing valve is connected to the oil outlet of the oil replenishment pump, the oil inlet of the oil replenishment pump is connected to the oil tank, the oil return port of the overflow valve and the oil return port of the proportional pressure reducing valve are connected to the oil tank, and the oil replenishment pump is used to connect to the travel motor.

[0017] Beneficial effect: The oil charge pump is used to provide power for the tensioning cylinder without affecting the normal use of the main pump.

[0018] In an optional embodiment, the track tensioning system also includes a one-way valve, the oil inlet of the one-way valve is connected to the oil outlet of the reversing valve, and the oil outlet of the one-way valve is connected to the oil inlet of the proportional pressure reducing valve. The one-way valve is used to allow the hydraulic oil to flow in one direction to the proportional pressure reducing valve.

[0019] Beneficial effect: The one-way valve can prevent the hydraulic oil from flowing from the proportional pressure reducing valve to the reversing valve, which can maintain the pressure in the system and prevent pressure loss, thereby maintaining the pressure and stability of the system.

[0020] In an optional embodiment, the reversing valve is a 2 / 2-way reversing valve.

[0021] Beneficial Effects: 2 / 2-way directional valves typically have only one operating position, reducing the possibility of misoperation and improving system safety. 2 / 2-way directional valves have advantages such as simple structure, easy operation, high reliability, wide application, good economy, high flexibility, small size, and high safety.

[0022] In an optional embodiment, the pressure detection component is a pressure sensor.

[0023] Beneficial effects: Pressure sensors typically have high measurement accuracy and can provide very accurate pressure readings with a small error range. They can quickly respond to pressure changes and provide almost real-time pressure data, allowing precise adjustment of the tensioning cylinder pressure to ensure that the track tension meets the environmental conditions.

[0024] In a second aspect, the present invention further provides an engineering machine, comprising: the above-mentioned track tensioning system. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 This is a schematic structural diagram of a track tensioning system according to an embodiment of the present utility model;

[0027] Figure 2 This is a structural diagram of a hydraulic system of a walking mechanism according to an embodiment of the present utility model;

[0028] Figure 3 for Figure 2 A partial structural diagram of the hydraulic system of the walking mechanism shown;

[0029] Figure 4 This is a structural diagram of a hydraulic system of another traveling mechanism according to an embodiment of the present utility model;

[0030] Figure 5 This is a control logic diagram of a track tensioning system according to an embodiment of the present utility model.

[0031] Description of reference numerals:

[0032] 1. Reversing valve; 2. Proportional pressure reducing valve; 3. Tensioning cylinder; 4. Pressure sensor; 5. Control unit; 6. Overflow valve; 7. Check valve; 8. Oil supply pump; 9. Oil tank; 10. Main pump; 11. Valve group; 12. Travel motor. DETAILED DESCRIPTION

[0033] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0034] The following combination Figures 1 to 5 , describing the embodiments of the present utility model.

[0035] According to an embodiment of the present invention, on the one hand, a track tensioning system is provided, comprising: a hydraulic oil source, a reversing valve 1, a proportional pressure reducing valve 2, a tensioning cylinder 3, a pressure detecting element, and a control unit 5. The hydraulic oil source is used to provide hydraulic oil; the reversing valve 1 has a first working position in which its oil inlet and oil outlet are connected, and the reversing valve 1 also has a second working position in which its oil inlet and oil outlet are not connected; the oil inlet of the proportional pressure reducing valve 2 is connected to the oil outlet of the reversing valve 1; the tensioning cylinder 3 has a rodless chamber and a rod chamber, the rodless chamber is connected to the oil outlet of the proportional pressure reducing valve 2, and the tensioning cylinder 3 is used to adjust the tension of the track; the pressure detecting element is used to detect the pressure in the rodless chamber; the control unit 5 is electrically connected to the reversing valve 1, the proportional pressure reducing valve 2, and the pressure detecting element, and is used to control the working position of the reversing valve 1 and the set pressure of the proportional pressure reducing valve 2 according to the environmental working conditions and the pressure detected by the pressure detecting element.

[0036] When the track tensioning system of this embodiment is applied, the pressure detection component detects the pressure of the rodless chamber of the tensioning cylinder 3 in real time and feeds back the pressure value to the control unit 5. The control unit 5 controls the set pressure of the proportional pressure reducing valve 2 and the working position of the reversing valve 1 based on the pressure detection component and the environmental working conditions, thereby controlling the pressure of the hydraulic oil in the tensioning cylinder 3, thereby realizing automatic and precise control of the track tension. There is no need for the operator to manually adjust the tightness of the track, which reduces the labor intensity of the operator, saves working time, and improves production efficiency. It effectively solves the problem of the operator manually adjusting the tightness of the track, which increases the labor intensity of the operator and wastes working time.

[0037] It should be noted that the piston rod of the tensioning cylinder 3 is connected to the tensioning wheel, and the tensioning wheel is movably arranged on the track frame. The tensioning wheel moves to tension the track.

[0038] In one embodiment, when the pressure detected by the pressure detection component is lower than the set value corresponding to the environmental working condition, it indicates that the pressure in the tensioning cylinder 3 is relatively small, and the control unit 5 controls the reversing valve 1 to be in the first working position, and the hydraulic oil of the hydraulic oil source flows into the rodless chamber through the reversing valve 1 and the proportional pressure reducing valve 2, and the hydraulic oil source supplies oil to the tensioning cylinder 3 until the pressure detected by the pressure detection component is greater than or equal to the set value corresponding to the environmental working condition; when the pressure detected by the pressure detection component is greater than or equal to the set value corresponding to the environmental working condition, it indicates that the pressure in the tensioning cylinder 3 is relatively large or appropriate, and the control unit 5 controls the reversing valve 1 to be in the second working position, and the oil circuit between the hydraulic oil source and the tensioning cylinder 3 is cut off by the reversing valve 1, and the hydraulic oil source stops supplying oil to the tensioning cylinder 3.

[0039] By precisely controlling the pressure entering the tensioning cylinder 3, mechanical damage or premature wear caused by excessive pressure can be avoided, while loosening of the track caused by insufficient pressure can also be prevented.

[0040] In one embodiment, the environmental working conditions include soft working conditions, standard working conditions and hard working conditions. The set values ​​corresponding to the soft working conditions, standard working conditions and hard working conditions are different. The set pressure of the proportional pressure reducing valve 2 is different with the different environmental working conditions, and the set pressure of the proportional pressure reducing valve 2 is also different.

[0041] Under different working conditions, the required tension of the crawler track may vary. The proportional pressure reducing valve 2 can be flexibly adjusted according to the actual situation, so that the machine can maintain a good operating state under various working conditions and can adapt to different working conditions.

[0042] In one embodiment, Figure 1 As shown, the track tensioning system also includes a relief valve 6, which communicates with the rodless chamber. When the pressure detected by the pressure sensor exceeds the set value corresponding to the ambient operating conditions, the control unit 5 controls the relief valve 6 to open until the pressure detected by the pressure sensor reaches the set value corresponding to the ambient operating conditions. When the pressure in the tensioning cylinder 3 is high, the control unit 5 controls the relief valve 6 to open, and the hydraulic oil in the tensioning cylinder 3 is relieved through the relief valve 6, preventing mechanical damage or premature wear caused by excessive pressure, thereby extending the service life of the tensioning system.

[0043] Furthermore, the relief valve 6 is a proportional relief valve 6 , which can achieve continuous pressure regulation by adjusting the input current, thereby providing very precise pressure control.

[0044] In one embodiment, Figure 4 As shown, the hydraulic oil source includes a main pump 10 and a fuel tank 9. The oil inlet of the reversing valve 1 is connected to the oil outlet of the main pump 10, which in turn is connected to the fuel tank 9. The oil return port of the relief valve 6 and the oil return port of the proportional pressure reducing valve 2 are also connected to the fuel tank 9. The main pump 10 is used to communicate with the travel motor 12. The main pump 10 provides power for the travel motor 12, pushing hydraulic oil into the travel motor 12, thereby driving the travel motor 12. Using the main pump 10 to power the tensioning cylinder 3 enables multitasking, simplifies the structure, and reduces costs.

[0045] Furthermore, the main pump 10 supplies oil to the travel motor 12 to realize the travel function of the entire machine, and the forward and reverse functions of the entire machine are realized through the forward and reverse rotation of the main pump 10.

[0046] It is understood that in another embodiment, Figure 2 and Figure 3As shown, the hydraulic oil source includes a charge pump 8 and a fuel tank 9. The oil inlet of the reversing valve 1 is connected to the oil outlet of the charge pump 8, which in turn is connected to the fuel tank 9. The oil return port of the relief valve 6 and the oil return port of the proportional pressure reducing valve 2 are also connected to the fuel tank 9. The charge pump 8 is used to communicate with the travel motor 12. Internal leakage is inevitable in hydraulic systems, especially under high-pressure operating conditions. The charge pump 8 continuously replenishes oil lost due to internal leakage, ensuring that the system always has sufficient oil. The charge pump 8 not only provides oil replenishment for the hydraulic closed system, but also provides a flushing function. The charge pump 8 provides power to the tensioning cylinder 3 without affecting the normal operation of the main pump 10.

[0047] In one embodiment, the track tensioning system further includes a one-way valve 7, the oil inlet of which is connected to the oil outlet of the reversing valve 1, and the oil outlet of which is connected to the oil inlet of the proportional pressure-reducing valve 2. The one-way valve 7 is configured to allow hydraulic oil to flow in one direction toward the proportional pressure-reducing valve 2. The one-way valve 7 prevents hydraulic oil from flowing from the proportional pressure-reducing valve 2 to the reversing valve 1, thereby maintaining pressure in the system and preventing pressure loss, thereby maintaining system pressure and stability.

[0048] In one embodiment, the reversing valve 1 is a 2-position, 2-way reversing valve. A 2-position, 2-way reversing valve typically has only one actuating position, which reduces the possibility of misoperation and improves system safety. The 2-position, 2-way reversing valve has advantages such as simple structure, easy operation, high reliability, wide application, good economy, high flexibility, small size, and high safety.

[0049] It is understandable that in another embodiment, the reversing valve 1 may also be other valves, and is not limited thereto.

[0050] Furthermore, the reversing valve 1, the proportional pressure reducing valve 2 and the overflow valve 6 are all solenoid valves, which control the movement of the valve core by energizing and de-energizing the electromagnetic coil, thereby achieving control of the fluid flow. The solenoid valve has the advantages of fast response speed and precise control.

[0051] In one embodiment, the pressure sensing element is a pressure sensor 4. The pressure sensor 4 typically has high measurement accuracy and can provide very accurate pressure readings with a small error range. It can quickly respond to pressure changes and provide nearly real-time pressure data, allowing precise adjustment of the pressure in the tensioning cylinder 3 to ensure that the track tension meets environmental conditions.

[0052] According to an embodiment of the present invention, on the other hand, a construction machine is provided, comprising: the above-mentioned track tensioning system.

[0053] In one embodiment, Figures 2 to 3As shown, the engineering machinery also includes a travel hydraulic system, which includes a main pump, an oil replenishment pump, a travel motor 12 and a valve group 11. The main pump is connected to the travel motor 12 through the valve group 11. The travel hydraulic system is a conventional hydraulic system and will not be described in detail here.

[0054] Furthermore, the main pump 10 or the oil replenishment pump 8 is connected to the reversing valve 1, the reversing valve 1 is connected to the one-way valve 7, the one-way valve 7 is connected to the proportional pressure reducing valve 2, the proportional pressure reducing valve 2 is connected to the tensioning cylinder 3, the pressure sensor 4 is connected to the tensioning cylinder 3, the pressure sensor monitors the tensioning pressure and feeds back the pressure value to the control unit 5, the control unit 5 controls the set pressure of the proportional pressure reducing valve 2, the control unit 5 controls the working position of the reversing valve 1, the control unit 5 is electrically connected to the proportional overflow valve 6, and the pressure of the tensioning cylinder 3 is set through the proportional overflow valve 6.

[0055] Specifically, the working machinery includes but is not limited to skid loaders, excavators, cranes, pile drivers, mixers, etc.

[0056] Furthermore, if Figure 5 As shown, the operator selects the environmental working condition, which can be a soft working condition, a standard working condition or a hard working condition. The control unit 5 controls the overflow pressure values ​​of the proportional overflow valve 6 to be X1, X2 and X3 respectively.

[0057] Take soft working conditions as an example to illustrate the control process of the track tensioning system:

[0058] Determine whether the pressure value X of the tensioning cylinder 3 detected by the pressure sensor is less than X1;

[0059] If X<X1, the control unit 5 controls the reversing valve 1 to be in the first working position of the left conduction, and the main pump 10 or the oil replenishment pump 8 supplies oil to the tensioning cylinder 3 through the oil circuit through the reversing valve 1, the one-way valve 7, and the proportional pressure reducing valve 2. Until it is detected that X≥X1, the control unit 5 controls the reversing valve 1 to switch to the second working position of the right cut-off. At this time, the oil replenishment channel between the main pump 10 or the oil replenishment pump 8 and the tensioning cylinder 3 is cut off, and the oil pressure in the tensioning cylinder 3 is relieved through the proportional relief valve 6 until the pressure reaches X1.

[0060] When the operator selects other working conditions, the control process is the same as that of the soft working condition.

[0061] In the related art, if the operator forgets to adjust the tension for a long time, the track will become loose, causing the track to fall off, causing the entire machine to stop, affecting work efficiency and reducing production efficiency.

[0062] In order to solve the problem that the track tensioning cylinder of the crawler skid loader needs to be regularly greased and tensioned by the operator, which increases the labor intensity of the operator and wastes working time, in this embodiment, different pressures are set for the tensioning cylinder 3 in response to the crawler slip in different environments such as soft working conditions, standard working conditions, hard working conditions, etc. The control unit 5 controls the set pressure of the proportional pressure reducing valve 2 and the working position of the reversing valve 1 based on the pressure detection component and the environmental working conditions, and then controls the pressure of the hydraulic oil in the tensioning cylinder 3 to achieve automatic and precise control of the track tension, so that the whole machine can be in the best working state, without the operator having to manually adjust the tightness of the track, reducing the labor intensity of the operator, saving working time, and improving production efficiency.

[0063] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations shall fall within the scope defined by the appended claims.

Claims

1. A crawler track tensioning system, characterized in that: include: A hydraulic oil source, used for providing hydraulic oil; The reversing valve (1) has a first working position in which the oil inlet and the oil outlet are connected, and the reversing valve (1) also has a second working position in which the oil inlet and the oil outlet are not connected; A proportional pressure reducing valve (2), wherein the oil inlet of the proportional pressure reducing valve (2) is connected to the oil outlet of the reversing valve (1); A tensioning oil cylinder (3) having a rodless chamber and a rod chamber, wherein the rodless chamber is communicated with the oil outlet of the proportional pressure reducing valve (2), and the tensioning oil cylinder (3) is used to adjust the tension of the crawler track; A pressure detection member, used for detecting the pressure of the rodless cavity; A control unit (5) is electrically connected to the reversing valve (1), the proportional pressure reducing valve (2), and the pressure detecting element. The control unit (5) is used to control the working position of the reversing valve (1) and the set pressure of the proportional pressure reducing valve (2) according to environmental conditions and the pressure detected by the pressure detecting element.

2. The track tensioning system according to claim 1, characterized in that: When the pressure detected by the pressure detection component is less than the set value corresponding to the environmental working condition, the control unit (5) controls the reversing valve (1) to be in the first working position; when the pressure detected by the pressure detection component is greater than or equal to the set value corresponding to the environmental working condition, the control unit (5) controls the reversing valve (1) to be in the second working position.

3. The track tensioning system according to claim 2, characterized in that: The environmental working conditions include soft working conditions, standard working conditions and hard working conditions. The setting values ​​corresponding to the soft working conditions, the standard working conditions and the hard working conditions are different. The setting pressure of the proportional pressure reducing valve (2) also varies with the different environmental working conditions.

4. The track tensioning system according to any one of claims 1 to 3, characterized in that: The track tensioning system further includes an overflow valve (6), which is connected to the rodless chamber. When the pressure detected by the pressure detection component is greater than the set value corresponding to the environmental working condition, the control unit (5) controls the overflow valve (6) to open until the pressure detected by the pressure detection component reaches the set value corresponding to the environmental working condition.

5. The track tensioning system according to claim 4, characterized in that: The hydraulic oil source includes a main pump (10) and an oil tank (9); the oil inlet of the reversing valve (1) is connected to the oil outlet of the main pump (10); the oil inlet of the main pump (10) is connected to the oil tank (9); the oil return port of the overflow valve (6) and the oil return port of the proportional pressure reducing valve (2) are connected to the oil tank (9); and the main pump (10) is used to be connected to the travel motor.

6. The track tensioning system according to claim 4, characterized in that: The hydraulic oil source includes an oil replenishing pump (8) and an oil tank (9); the oil inlet of the reversing valve (1) is connected to the oil outlet of the oil replenishing pump (8); the oil inlet of the oil replenishing pump (8) is connected to the oil tank (9); the oil return port of the overflow valve (6) and the oil return port of the proportional pressure reducing valve (2) are connected to the oil tank (9); and the oil replenishing pump (8) is used to be connected to the travel motor.

7. The track tensioning system according to any one of claims 1 to 3, characterized in that: The track tensioning system further comprises a one-way valve (7), the oil inlet of the one-way valve (7) being connected to the oil outlet of the reversing valve (1), and the oil outlet of the one-way valve (7) being connected to the oil inlet of the proportional pressure reducing valve (2), and the one-way valve (7) being used to allow the hydraulic oil to flow in one direction toward the proportional pressure reducing valve (2).

8. The track tensioning system according to any one of claims 1 to 3, characterized in that: The reversing valve (1) is a two-position two-way reversing valve.

9. The track tensioning system according to any one of claims 1 to 3, characterized in that: The pressure detection component is a pressure sensor (4).

10. An engineering machine, characterized in that: include: The track tensioning system according to any one of claims 1 to 9.

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