Crawler traction hydraulic station

Abstract

The present invention discloses a crawler traction hydraulic station, which belongs to the technical field of hydraulic stations. It includes a control pump, a variable pump, a variable motor and a hydraulic auxiliary system. The hydraulic auxiliary system includes a filter connected in series between the variable pump and the variable motor. The filter includes a shell and a filter element installed in the shell. One end and a side wall of the filter element are provided with filter material. The other end of the filter element is connected to the oil inlet on the shell. The inner wall of the filter element away from the oil inlet is in the shape of a cone. The crawler traction hydraulic station provided by the present invention arranges filter material on the side wall and one end of the filter element of the filter in the hydraulic auxiliary system, and designs the lower part of the filter element into a cone shape, so that after entering the interior of the filter element, the oil can flow in the radial and axial directions of the filter element respectively to achieve filtration. The oil flowing out from the filtering end of the filter element can drive the impurities intercepted by the filter material on the inner wall of the filter element to flow toward the filtering end of the filter element, thereby extending the time that the inner wall of the filter element is blocked by impurities and improving the service life of the filter element.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic stations, and in particular discloses a crawler traction hydraulic station. Background Art

[0002] Crawler traveling mechanisms are mostly used in sites with poor road conditions and harsh environments. Combined with the power provided by the traction hydraulic system (hydraulic station), the crawler traveling mechanism has the advantages of large traction, low ground pressure, strong climbing ability, and small turning radius, and is therefore widely used in the engineering field. In the crawler traction hydraulic system, the filtering device plays an important role. The filtering device is mainly divided into oil suction filter, system filter and return oil filter. Among them, the system filter is installed after the outlet of the oil pump and before the actuator, that is, the high-pressure end of the hydraulic system. It needs to withstand higher oil pressure when in use.

[0003] For example, patent number CN219754974U, published on September 26, 2023, discloses a dual-track hydraulic station comprising a fuel tank and a dual-track cylinder. The fuel tank contains hydraulic oil, and a gear pump is installed in the fuel tank. The gear pump is connected to a motor via a coupling. One end of the gear pump's oil outlet pipe is connected to a first electromagnetic reversing valve, and the other end of the gear pump's oil outlet pipe is connected to a dual-track cylinder circuit. The dual-track cylinder circuit is provided with a high-pressure filter, and the output port of the high-pressure filter is connected to an accumulator. The dual-track hydraulic station has the advantages of being compact, small in size, and compact in structure. It also has a large cooling and heat exchange area, allowing for cooling operations. By providing a heat sink and a water cooler, the medium oil in the circuit and the fuel tank can be quickly cooled. The accumulator can maintain the piston head in a certain position. At this time, the accumulator acts as a power source, saving energy. If one of the solenoid valves loses power, the medium in the fuel tank is circulated and cooled, without affecting actual use, ensuring that the medium temperature is within a controllable range.

[0004] The shortcomings of existing hydraulic stations, including the above-mentioned patents, are that, when designing existing filters, a cylindrical filter element is usually installed in a cylindrical housing, and the oil directly enters the interior of the filter element and is filtered outward through the side wall of the filter element, so that the impurities left by the filtration can be retained in the interior of the filter element. The system filter is used in a higher oil pressure environment. Since the oil is filtered outward approximately along the radial direction of the filter element, the force of the oil on the impurities retained on the inner wall of the filter element will cause the impurities to be pushed to the inner wall of the filter element by the oil, thereby causing the filter element to be clogged, reducing the use effect of the filter or the filter pores are clogged, resulting in reduced filtering effect, or causing the flow rate of the oil at the oil outlet end of the filter to decrease and the oil pressure to decrease. Summary of the Invention

[0005] The purpose of the present invention is to provide a crawler traction hydraulic station whose filter element is not easily clogged.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] The crawler traction hydraulic station includes a control pump, a variable pump, a variable motor and a hydraulic auxiliary system. The input ends of the control pump and the variable pump are both connected to the power source, the input end of the variable motor is connected to the output end of the variable pump, and the output end of the variable motor is transmission-connected to the crawler walking mechanism. The hydraulic auxiliary system includes a filter connected in series between the variable pump and the variable motor. The filter includes a housing and a filter element installed in the housing. One end and side wall of the filter element are provided with filter material. The other end of the filter element is connected to the oil inlet on the housing so that oil can enter the interior of the filter element and flow through the filter material to the outside of the filter element. The inner wall of the filter element away from the oil inlet is frustum-shaped.

[0008] In the above-mentioned hydraulic station, a guide sleeve is installed in the shell, the upper dynamic seal of the filter element is installed inside the guide sleeve, and the side wall of the filter element is divided into a first filter section and a second filter section along its own axial direction. The filter element has a first position and a second position along the axial direction of the guide sleeve. When in the first position, the first filter section is inside the guide sleeve, and when in the second position, the first filter section is outside the guide sleeve.

[0009] In the above-mentioned hydraulic station, the filter element includes a support tube, the upper part of the support tube is cylindrical, and the lower part of the support tube is hollow truncated cone-shaped. The outer wall of the support tube is provided with a first annular groove and a second annular groove along its circumference. The first annular groove corresponds to the cylindrical part of the support tube, and the second annular groove corresponds to the hollow truncated cone-shaped part of the support tube. The positions corresponding to the first annular groove and the second annular groove on the support tube are both metal meshes, and filter materials are provided in the first annular groove and the second annular groove.

[0010] In the hydraulic station, a spring is installed in the shell corresponding to the end of the support tube away from the guide sleeve.

[0011] In the hydraulic station, one end of the support pipe in the guide sleeve is sleeved with a sealing ring, the cross section of the sealing ring is a right-angled trapezoid, and the sealing ring cooperates with the inner wall of the guide sleeve to achieve sealing.

[0012] In the above hydraulic station, a raised ring is formed on the inner wall of the guide sleeve along its circumference. When the support tube is in the second position, the raised ring blocks the support tube to prevent the support tube from separating from the guide sleeve.

[0013] The hydraulic station is provided with a detection assembly in the shell, and when the support pipe is in the second position, the detection assembly issues an alarm.

[0014] The above-mentioned hydraulic station, the shell includes a fixed shell and a protective shell connected to each other, the filter element is installed in the protective shell, the fixed shell is equipped with a feed pipe and a discharge pipe, the feed pipe is connected to the interior of the filter element, and the discharge pipe is connected to the chamber between the protective shell and the filter element.

[0015] In the above-mentioned hydraulic station, a circular ring is fixedly connected to the outer wall of the guide sleeve, and a plurality of through holes are opened on the circular ring along its own axial direction. A lap groove is opened at one end of the protective shell corresponding to the fixed shell. The outer wall of the circular ring is provided with an annular protrusion protruding along its own circumference to cooperate with the lap groove, and the limit groove extends to one end of the guide sleeve corresponding to the filtering end of the filter element.

[0016] In the above hydraulic station, protective nets are provided at positions of the outer wall of the support pipe corresponding to the first annular groove and the second annular groove, and the protective nets respectively confine the corresponding filter materials within the first annular groove and the second annular groove.

[0017] In the above technical solution, the crawler traction hydraulic station provided by the present invention arranges filter material on the side wall and one end of the filter element of the filter in the hydraulic auxiliary system, and designs the lower part of the filter element into a frustum shape, so that after the oil enters the filter element, it can flow in the radial and axial directions of the filter element respectively to achieve filtration. The oil flowing out from the filtering end of the filter element can drive the filter material to intercept the impurities on the inner wall of the filter element and flow to the filtering end of the filter element, thereby extending the time that the inner wall of the filter element is blocked by impurities and improving the service life of the filter element. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0019] Figure 1 A system block diagram of a hydraulic station provided by an embodiment of the present invention;

[0020] Figure 2 A perspective view of a filter provided by an embodiment of the present invention;

[0021] Figure 3 A front view of a filter provided by an embodiment of the present invention;

[0022] Figure 4 A cross-sectional view of a filter provided by an embodiment of the present invention;

[0023] Figure 5 A schematic diagram of the matching state of the support tube and the guide sleeve provided in an embodiment of the present invention;

[0024] Figure 6 An enlarged schematic diagram of a cross-sectional view of a support tube provided in an embodiment of the present invention;

[0025] Figure 7 A cross-sectional view of a guide sleeve provided in an embodiment of the present invention;

[0026] Figure 8 A cross-sectional view of a filter element provided in an embodiment of the present invention;

[0027] Figure 9 A cross-sectional view of a protective shell provided by an embodiment of the present invention;

[0028] Figure 10 A cross-sectional view of a fixed housing provided in an embodiment of the present invention.

[0029] Description of reference numerals:

[0030] 1. Shell; 11. Fixed shell; 111. Feed pipe; 112. Discharge pipe; 113. Inner cavity; 114. Outer cavity; 115. Sleeve; 12. Protective shell; 121. Overlap groove; 2. Filter element; 21. Support tube; 211. First ring groove; 212. Second ring groove; 213. Limiting ring groove; 22. Sealing ring; 23. Protective net; 3. Filter material; 4. Guide sleeve; 41. First section; 42. Second section; 43. Third section; 44. Raised ring; 45. Circular ring; 451. Through hole; 452. Annular protrusion; 5. Spring; 6. Detection assembly. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0032] In the description of the present invention, unless otherwise specified, “multiple” means two or more; the terms “upper”, “lower”, “left”, “right”, “inside”, “outside”, “front end”, “rear end”, “head”, “tail”, etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms “connected” and “connected” should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] like Figures 1-10As shown, the crawler traction hydraulic station provided by the embodiment of the present invention includes a control pump, a variable pump, a variable motor and a hydraulic auxiliary system. The input ends of the control pump and the variable pump are both connected to the power source, the input end of the variable motor is connected to the output end of the variable pump, and the output end of the variable motor is transmission-connected to the crawler walking mechanism. The hydraulic auxiliary system includes a filter connected in series between the variable pump and the variable motor. The filter includes a housing 1 and a filter element 2 installed in the housing 1. One end and side wall of the filter element 2 are provided with filter material 3. The other end of the filter element 2 is connected to the oil inlet on the housing 1 so that the oil can enter the interior of the filter element 2 and flow through the filter material 3 to the outside of the filter element 2. The inner wall of the filter element 2 away from the oil inlet is frustum-shaped.

[0034] Specifically, heavy engineering machinery with tracks, such as excavators and bulldozers, mostly use hydraulic systems for power transmission. The drive device of the crawler walking includes a diesel engine, a transfer case and a hydraulic system. Among them, the diesel engine is used as a power source, and its output end is connected to the transfer case. The hydraulic system includes a control pump, a variable pump, a variable motor and a hydraulic auxiliary system and a fuel tank. The control pump and the variable pump are both connected to the output end of the transfer case. The transfer case distributes the power of the diesel engine and outputs the control pump and the variable pump respectively. The hydraulic auxiliary system includes a motor installed on the variable pump and the variable pump. The filter between the motors can filter the oil delivered by the variable pump to ensure that the oil is delivered to the variable motor after filtration. The variable motor drives its corresponding reducer to drive the crawler, and the control pump mainly provides hydraulic oil for the control and flushing of the variable pump and variable motor; the filter includes a shell 1 and a filter element 2 installed inside the shell 1, and an oil inlet and an oil outlet are provided on the shell 1, wherein the oil inlet is directly connected to the inner cavity of the filter element 2, and the oil outlet is connected to the cavity between the inner wall of the shell 1 and the outer wall of the filter element 2, such as Figure 4 As shown, the lower part of the filter element 2 is in the shape of a truncated cone. Figure 3 As shown, the upper end of the filter element 2 is connected to the inner wall of the housing 1, and an opening is provided at one end of the filter element 2 connected to the housing 1. The side wall and the lower end of the truncated cone-shaped part are provided with filter material 3, and there is a gap between the end of the filter element 2 on which the filter material 3 is provided and the inner wall of the housing 1 to ensure that the oil can pass through the filter material 3 to reach the chamber between the inner wall of the housing 1 and the filter element 2. The filter material 3 can be made of glass fiber or chemical fiber filter paper with higher filtration accuracy.

[0035] For the convenience of description, the end of the filter element 2 connected to the inner wall of the shell 1, that is, the end with an opening is the fixed end, and the end of the filter element 2 with the filter material 3 is the filtering end. The oil transported to the variable motor by the variable pump enters the opening from the oil inlet and then enters the interior of the filter element 2. The oil passes through the side wall of the filter element 2 and the filter material 3 provided at the filtering end to reach the chamber between the inner wall of the shell 1 and the filter element 2, and is transported to the variable motor from the oil outlet.

[0036] The crawler traction hydraulic station provided by an embodiment of the present invention arranges filter material 3 on the side wall and one end of the filter element 2 of the filter in the hydraulic auxiliary system, and designs the lower part of the filter element 2 into a frustum shape, so that after the oil enters the interior of the filter element 2, it can flow in the radial and axial directions of the filter element 2 to achieve filtration. The oil flowing out from the filtering end of the filter element 2 can drive the filter material 3 to intercept impurities on the inner wall of the filter element 2 and flow to the filtering end of the filter element 2, thereby extending the time that the inner wall of the filter element 2 is blocked by impurities and improving the service life of the filter element 2.

[0037] Furthermore, a guide sleeve 4 is installed in the shell 1, the upper part of the filter element 2 is dynamically sealed and installed inside the guide sleeve 4, and the side wall of the filter element 2 is divided into a first filter section and a second filter section along its own axial direction. The filter element 2 has a first position and a second position along the axial direction of the guide sleeve 4. When in the first position, the first filter section is inside the guide sleeve 4, and when in the second position, the first filter section is outside the guide sleeve 4.

[0038] Optionally, the filter element 2 includes a support tube 21, the upper part of the support tube 21 is cylindrical, and the lower part of the support tube 21 is hollow truncated cone. The outer wall of the support tube 21 is provided with a first annular groove 211 and a second annular groove 212 along its own circumference. The first annular groove 211 corresponds to the cylindrical part of the support tube 21, and the second annular groove 212 corresponds to the hollow truncated cone part of the support tube 21. The positions corresponding to the first annular groove 211 and the second annular groove 212 on the support tube 21 are both metal meshes, and filter material 3 is provided in the first annular groove 211 and the second annular groove 212.

[0039] Specifically, in the above embodiment, by arranging filter materials 3 on the side walls and the filter end of the filter element 2, the oil flowing along the axial direction of the filter element 2 can flush the impurities attached to the inner wall of the filter element 2 to the filter end of the filter element 2. Although the probability of the inner wall of the filter element 2 being blocked by impurities can be reduced, after the filter element 2 has been used for a period of time, as the impurities accumulated on the filter material 3 at the filter end of the filter element 2 increase, this part of the filter material 3 will be blocked. Since a certain gap is reserved between the filter end of the filter element 2 and the inner wall of the housing 1 for the oil to flow out, , indirectly reducing the support effect of the filter element 2 in the housing 1. When the oil pressure in the filter element 2 is too high, the connection between the fixed end of the filter element 2 and the housing 1 will be affected, or the filter material 3 arranged at the filtering end will be over-stretched and the pores will become larger, and eventually the filtering effect on the oil will be lost. In this embodiment, a guide sleeve 4 is provided at one end of the housing 1 corresponding to the fixed end of the filter element 2. The main structure of the filter element 2 is a support tube 21. The support tube 21 consists of two parts, the upper part of which is cylindrical and the lower part is hollow truncated cone. Figure 4 、 Figure 5 、 Figure 6 and Figure 8As shown, the upper outer wall of the support tube 21 is provided with a first annular groove 211 along its circumference, and the lower outer wall of the support tube 21 is provided with a second annular groove 212 along its circumference. The second annular groove 212 is also hollow truncated cone-shaped. Figure 8 As shown, the opening area of ​​the first annular groove 211 is the first filtering section, and the opening area of ​​the second annular groove 212 is the second filtering section. The depth of the first annular groove 211 and the second annular groove 212, that is, the radial dimension along the support tube 21, is smaller than the thickness of the support tube 21. The opening positions corresponding to the first annular groove 211 and the second annular groove 212 on the support tube 21 are both metal meshes. Filter materials 3 are provided in the first annular groove 211 and the second annular groove 212. The filter materials 3 completely block the first annular groove 211 and the second annular groove 212 respectively, so that the oil entering the interior of the support tube 21 can pass through the metal mesh to reach the first annular groove 211 and the second annular groove 212. 2, and reaches the outside of the support tube 21 through the filter material 3. In addition, in this embodiment, the upper part of the support tube 21 is dynamically sealed and installed inside the guide sleeve 4. The upper and lower outer walls of the cylindrical part of the support tube 21 are both provided with sealing gaskets. The end of the support tube 21 inside the guide sleeve 4 is the fixed end of the filter element 2, and the end of the support tube 21 outside the guide sleeve 4 is the filtering end of the filter element 2. This arrangement allows the support tube 21 to be displaced along the axial direction of the guide sleeve 4. During the axial movement of the support tube 21 along the guide sleeve 4, it has a first position and a second position relative to the guide sleeve 4:

[0040] When in the first position, the first annular groove 211 on the support tube 21 and the filter material 3 disposed in the first annular groove 211 are completely inside the support tube 21. In this state, the sealing gasket disposed on the outer wall of the support tube 21 and between the first annular groove 211 and the second annular groove 212 seals the gap between the support tube 21 and the guide sleeve 4. The oil can only flow to the outside of the support tube 21 through the filter material 3 corresponding to the second annular groove 212 and the filter material 3 disposed at the filter end.

[0041] When in the second position, the first annular groove 211 and the second annular groove 212 on the support tube 21 are both outside the guide sleeve 4. In this state, the sealing gasket arranged on the outer wall of the fixed end of the support tube 21 contacts the inner wall of the guide sleeve 4, sealing the gap between the support tube 21 and the guide sleeve 4, ensuring that the oil entering the housing 1 can only reach the outside of the support tube 21 through the position where the filter material 3 is set, so that the oil can be fully filtered.

[0042] In this embodiment, when the filter material 3 provided at the fixed end is not clogged or the amount of clogs is small, the resistance to the oil flowing outward from the support tube 21 through the filter material 3 is small, and the impact force of the oil on the support tube 21 cannot overcome the static friction between the upper part of the support tube 21 and the guide sleeve 4. At this time, the support tube 21 is always in the first position; when the amount of clogs of the filter material 3 provided at the filtering end of the support tube 21 is too large, due to the high pressure of the oil flowing into the support tube 21, the impact force of the oil on the filter material 3 provided at the fixed end overcomes the static friction between the support tube 21 and the guide sleeve 4. The support tube 21 slowly moves from the first position to the second position. During this process, the first annular groove 211 gradually moves to the outside of the guide tube. While the oil flows to the outside of the support tube 21 through the filter material 3 set in the second annular groove 212, it can also flow to the outside of the support tube 21 through the filter material 3 set in the first annular groove 211, thereby reducing the impact force on the filter material 3 set at the fixed end, avoiding damage to the connection between the support tube 21 and the housing 1, and also avoiding the filter material 3 set at the filtering end from being overstretched due to excessive impact, resulting in loss of filtering effect on the oil.

[0043] On the other hand, after the existing filter element 2 is clogged, the flow rate of the oil passing through the filter is reduced or the flow rate is reduced, which will make it difficult for the flow rate of the oil to maintain the torque output of the variable motor, making it difficult for the variable motor to operate normally. If the flow rate of the oil passing through the filter is to be maintained at a certain value, the variable pump needs to overcome greater resistance to work, thereby causing the efficiency of the system to decrease and even causing the variable pump to overload. In this embodiment, after the support tube 21 is adjusted from the above-mentioned first position to the second position, the oil can flow to the outside of the support tube 21 through the filter material 3 corresponding to the first annular groove 211 to maintain a sufficient flow rate of the oil passing through the filter.

[0044] Furthermore, a spring 5 is installed in the housing 1 at the end of the support tube 21 away from the guide sleeve 4 .

[0045] Specifically, in the above embodiment, in order to prevent the support tube 21 from being triggered by mistake, the mistaken triggering means that when the filter material 3 set at the fixed end is not blocked in large quantities, the impact force of the oil on the filter material 3 set at the fixed end can drive the support tube 21 to move from the above-mentioned first position to the second position; in the above embodiment, the friction between the support tube 21 and the guide sleeve 4 needs to be large enough, and such a setting will make it difficult to remove and replace the support tube 21 from the guide sleeve 4; in this embodiment, a spring 5 is installed in the housing 1 at a position corresponding to the above-mentioned filter end, and the spring 5 is fixedly connected to the inner wall of the housing 1. Preferably, the support tube 21 corresponds to A limiting ring groove 213 is provided at one end of the spring 5. The limiting ring groove 213 is coaxially arranged with the support tube 21, and the radial dimension of the limiting ring groove 213 along the support tube 21 is larger than the diameter of the spring 5. In this way, when the support tube 21 is installed in the guide sleeve 4, the spring 5 can extend into the limiting ring groove 213. When the support tube 21 moves from the above-mentioned first position to the second position under the push of the oil, the end of the spring 5 corresponding to the support tube 21 can always be in the above-mentioned limiting ring groove 213, which facilitates the stable contraction of the spring 5 while preventing the spring 5 from being squeezed and deviated to cause damage to the filter material 3 arranged at the filter end.

[0046] In this embodiment, the spring 5 arranged on the inner wall of the shell 1 can prevent the support tube 21 from moving along the guide sleeve 4 when the filter material 3 at the filter end is not blocked or the amount of blockage is small. This can reduce the static friction between the support tube 21 and the guide sleeve 4, thereby facilitating the disassembly, cleaning or replacement of the entire filter element 2 from the guide sleeve 4.

[0047] In another embodiment of the present invention, a sealing ring 22 is mounted on one end of the support tube 21 in the guide sleeve 4. The cross section of the sealing ring 22 is a right-angled trapezoid, and the sealing ring 22 cooperates with the inner wall of the guide sleeve 4 to achieve sealing.

[0048] Specifically, such as Figure 4As shown, in order to improve the sealing effect between the support tube 21 and the guide sleeve 4 when the support tube 21 is in the first position, it is to prevent the oil entering the housing 1 from the oil inlet from reaching the support tube 21 and the guide sleeve 4 without being filtered, resulting in impurities in the oil affecting the dynamic sealing effect between the support tube 21 and the guide sleeve 4, and hindering the movement of the support tube 21 from the first position to the second position; in this embodiment, the end of the support tube 21 corresponding to the guide sleeve 4, that is, the end with an opening, is covered with a sealing ring 22, the cross-section of the sealing ring 22 is a right-angled trapezoid, the inner diameter of the guide sleeve 4 is gradually changed, and is divided into a first section 41, a second section 42 and a third section 43 along its own axial direction, wherein The inner diameter of the first section 41 is the largest, the inner diameter of the third section 43 is the smallest, and the inner diameter of the second section 42 gradually decreases from the first section 41 to the third section 43 to connect the first section 41 and the third section 43; when the support tube 21 is in the above-mentioned first position, the inclined surface of the sealing ring 22 is in close contact with the inner wall of the second section 42 of the guide sleeve 4, sealing the gap between the support tube 21 and the guide sleeve 4, thereby preventing unfiltered oil from reaching between the support tube 21 and the guide sleeve 4. As the thrust of the oil on the support tube 21 gradually increases, the sealing ring 22 gradually deforms until the sealing ring 22 slides from the second section 42 to the third section 43. During this process, the support tube 21 moves from the above-mentioned first position to the second position.

[0049] Furthermore, a raised ring 44 is formed on the inner wall of the guide sleeve 4 along its circumference. When the support tube 21 is in the second position, the raised ring 44 blocks the support tube 21 to prevent the support tube 21 from separating from the guide sleeve 4 .

[0050] Specifically, such as Figure 4 and Figure 7As shown, a raised ring 44 is formed on the inner wall of the guide sleeve 4 corresponding to one end of the spring 5 along its own circumference. The inner diameter of the raised ring 44 is smaller than the inner diameter of the third section 43. The raised ring 44 is formed on the inner wall of the third section 43 of the guide sleeve 4 away from the second section 42, and the maximum outer diameter of the cylindrical part of the support tube 21 is equal to the inner diameter of the raised ring 44, so that the opening of the raised ring 44 will not affect the movement of the support tube 21 from the first position to the second position; when the filter material 3 provided at the filtering end of the filter element 2 is not completely blocked, the force of the oil on the support tube 21 cannot push the support tube 21 to move to the second position. At this time, when the variable pump is started and the oil is delivered to the variable motor, although the support tube 21 can be pushed by the oil in the direction of the second position, due to the support of the spring 5 on the support tube 21, When the support tube 21 is pushed to move from the first position to the second position, the required thrust gradually increases. When the variable pump is closed, the force of the spring 5 on the support tube 21 will drive the support tube 21 to return to the above-mentioned first position. Only when the filter material 3 provided at the filtering end of the filter element 2 is fully blocked, the force of the oil on the support tube 21 can push the support tube 21 from the first position to the second position. During the use of the filter element 2, the vibration generated by the reciprocating movement of the support tube 21 in the guide sleeve 4 can be used to shake off impurities attached to the filter material 3 provided in the above-mentioned first annular groove 211 and the second annular groove 212, that is, to achieve self-cleaning of the filter material 3 in the first annular groove 211 and the second annular groove 212, thereby slowing down the blockage of the filter material 3 in the first annular groove 211 and the second annular groove 212.

[0051] In another embodiment provided by the present invention, a detection component 6 is provided in the housing 1 , and when the support tube 21 is in the second position, the detection component 6 issues an alarm.

[0052] Specifically, during the use of the existing filter, it is impossible to detect whether the filter element 2 is clogged and the clogged condition. The filter can only be inferred by the change in oil flow at the oil outlet of the filter in conjunction with the power change of the variable pump, resulting in the inability to clean or replace the filter element 2 in time. In this embodiment, a detection component 6 is provided in the housing 1. When the support tube 21 moves from the first position to the second position, it can be detected by the detection component 6 and an alarm is issued. Optionally, the detection component 6 can use an existing pressure sensor, which is installed on the inner wall of the housing 1. Figure 4 As shown, it corresponds to the edge of the filter end of the support tube 21, so that when the support tube 21 is in the above-mentioned second position, it can exert a force on the pressure sensor, thereby being detected by the pressure sensor and issuing an alarm.

[0053] In another embodiment proposed by the present invention, the shell 1 includes a fixed shell 11 and a protective shell 12 connected to each other, the filter element 2 is installed in the protective shell 12, and a feed pipe 111 and a discharge pipe 112 are installed on the fixed shell 11. The feed pipe 111 is connected to the interior of the filter element 2, and the discharge pipe 112 is connected to the chamber between the protective shell 12 and the filter element 2.

[0054] Specifically, in order to facilitate the removal of the filter element 2 for cleaning or replacement, in this embodiment, the housing 1 includes a fixed shell 11 and a protective shell 12 connected to each other, such as Figures 2 to 4 As shown, the fixed shell 11 is provided with a cylindrical inner cavity 113 and an annular outer cavity 114 provided outside the inner cavity. Figure 4 As shown, both ends of the fixed shell 11 and the end of the protective shell 12 corresponding to the fixed shell 11 are fixed with flanges, and the outer wall of the fixed shell 11 is also fixed with a feed pipe 111 and a discharge pipe 112, the feed pipe 111 is directly connected to the inner cavity 113, and the discharge pipe 112 is connected to the outer cavity 114, the feed pipe 111 corresponds to the above-mentioned oil inlet, and the discharge pipe 112 corresponds to the above-mentioned oil outlet. When the fixed shell 11 and the protective shell 12 are connected, the fixed shell 11 directly squeezes the support tube 21 into the guide sleeve 4 and presents Figure 4 In the state shown, at this time, the inner cavity 113 corresponds to the inner cavity of the support tube 21, and the outer cavity 114 is connected to the above chamber. With this arrangement, when the pressure sensor sounds an alarm, the fixed shell 11 and the protective shell 12 can be disassembled to remove the filter element 2 as a whole and replace it; preferably, a sleeve 115 is fixedly connected to the fixed shell 11, and the sleeve 115 extends to the inner side of the cylindrical part of the support tube 21, as shown in FIG. Figure 4 and Figure 10 As shown, when the support tube 21 is in the above-mentioned first state, the sleeve 115 blocks the portion of the inner wall of the support tube 21 corresponding to the first annular groove 211 from the inner side of the support tube 21 to prevent impurities in the oil from adhering to the inner wall of the support tube 21 at the position where the first annular groove 211 is opened. When the filter material 3 provided at the filtering end of the filter element 2 is not completely blocked, the support tube 21 can be continuously moved back and forth between the above-mentioned first position and the second position by repeatedly starting and stopping the variable pump or controlling its rotation speed. The end of the sleeve 115 in the support tube 21 is used to scrape off impurities attached to the inner wall of the support tube 21 corresponding to the first annular groove 211, thereby achieving self-cleaning of the upper inner wall of the support tube 21.

[0055] Furthermore, a circular ring 45 is fixed to the outer wall of the guide sleeve 4, and a plurality of through holes 451 are opened on the circular ring 45 along its own axial direction. A lap groove 121 is opened at one end of the protective shell 12 corresponding to the fixed shell 11, and an annular protrusion 452 is provided on the outer wall of the circular ring 45 along its own circumferential direction to cooperate with the lap groove 121.

[0056] Specifically, in the above embodiment, the inner wall of the protective shell 12 of the housing 1 is blocked by the guide sleeve 4 and is difficult to clean. In this embodiment, a ring 45 is fixed to the outer wall of the guide sleeve 4, and the upper surface of the ring 45 is flush with the end of the protective shell 12. Figure 4 、 Figure 5 、 Figure 7 and Figure 9 As shown, the outer wall of the ring 45 is provided with an annular protrusion 452 protruding along its own circumference, and the protective shell 12 is provided with a lap groove 121 at a position corresponding to the annular protrusion 452, so that the guide sleeve 4 is fixed in position when installed in the protective shell 12. After the fixed shell 11 is connected to the protective shell 12, the guide sleeve 4 can be pressed into the protective shell 12 through the cooperation of the annular protrusion 452 and the lap groove 121. In addition, in order to ensure that the oil after the filtered oil can pass through the ring 45 to reach the above-mentioned outer cavity 114, a through hole 451 is provided on the ring 45 along its own axial direction; when the inner wall of the protective shell 12 needs to be cleaned, the connection between the protective shell 12 and the fixed shell 11 is directly disassembled. Under the action of the spring 5, the guide sleeve 4 and the support tube 21 are passively ejected, and the guide sleeve 4 together with the filter element 2 can be removed as a whole, and then the support tube 21 can be directly pulled out as a whole from the guide sleeve 4.

[0057] In another embodiment provided by the present invention, protective nets 23 are provided at positions on the outer wall of the support tube 21 corresponding to the first annular groove 211 and the second annular groove 212 , and the protective nets 23 respectively confine the corresponding filter materials 3 within the first annular groove 211 and the second annular groove 212 .

[0058] Specifically, since the oil flows outward from the support tube 21 along the first annular groove 211 and the second annular groove 212, the oil will squeeze the filter material 3 set in the first annular groove 211 and the second annular groove 212 during the flow process, causing it to deform, and causing a certain impact on the connection between the filter material 3 and the support tube 21. In order to prevent the filter material 3 in the first annular groove 211 and the second annular groove 212 from falling off the support tube 21, in this embodiment, a protective net 23 is installed on the outer wall of the support tube 21 at the position corresponding to the first annular groove 211 and the second annular groove 212. The protective net 23 can block the corresponding filter material 3 in the first annular groove 211 and the second annular groove 212 respectively, preventing the filter material 3 from falling off the support tube 21, and also preventing the filter material 3 from excessive deformation, thereby ensuring the filtering effect of the filter material 3 on the oil.

[0059] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

Claims

1. A crawler traction hydraulic station, comprising a control pump, a variable displacement pump, a variable displacement motor, and a hydraulic auxiliary system. The input ends of both the control pump and the variable displacement pump are connected to a power source, the input end of the variable displacement motor is connected to the output end of the variable displacement pump, and the output end of the variable displacement motor is in transmission connection with a crawler travel mechanism. The system is characterized in that: The hydraulic auxiliary system includes a filter connected in series between a variable pump and a variable motor. The filter includes a housing and a filter element installed in the housing. One end and a side wall of the filter element are provided with filter material. The other end of the filter element is connected to the oil inlet on the housing so that the oil can enter the interior of the filter element and flow through the filter material to the outside of the filter element. The inner wall of the filter element away from the oil inlet is frustum-shaped. A guide sleeve is installed in the housing. The upper dynamic seal of the filter element is installed in the interior of the guide sleeve, and the side wall of the filter element is divided into a first filter section and a second filter section along its own axial direction. The filter element has a first position and a second position along the axial direction of the guide sleeve. When in the first position, the first filter section is inside the guide sleeve, and when in the second position, the first filter section is inside the guide sleeve. The filter section is outside the guide sleeve, and the filter element includes a support tube. The upper part of the support tube is cylindrical, and the lower part of the support tube is hollow truncated cone. The outer wall of the support tube is provided with a first annular groove and a second annular groove along its own circumference. The first annular groove corresponds to the cylindrical part of the support tube, and the second annular groove corresponds to the hollow truncated cone part of the support tube. Filter material is provided in the first annular groove and the second annular groove. One end of the support tube in the guide sleeve is provided with a sealing ring. The cross-section of the sealing ring is a right-angled trapezoid, and the sealing ring cooperates with the inner wall of the guide sleeve to achieve sealing. The inner wall of the guide sleeve is formed with a raised ring along its own circumference. When the support tube is in the second position, the raised ring blocks the support tube to prevent the support tube from detaching from the guide sleeve.

2. The crawler traction hydraulic station according to claim 1, characterized in that: The positions corresponding to the first annular groove and the second annular groove on the support tube are both metal meshes.

3. The crawler traction hydraulic station according to claim 1, characterized in that: A spring is installed in the shell corresponding to the end of the support tube away from the guide sleeve.

4. The crawler traction hydraulic station according to claim 1, characterized in that: A detection component is provided in the shell, and when the support tube is in the second position, the detection component sends out an alarm.

5. The crawler traction hydraulic station according to claim 1, characterized in that: The shell includes a fixed shell and a protective shell connected to each other. The filter element is installed in the protective shell. A feed pipe and a discharge pipe are installed on the fixed shell. The feed pipe is connected to the interior of the filter element, and the discharge pipe is connected to the chamber between the protective shell and the filter element.

6. The crawler traction hydraulic station according to claim 5, characterized in that: A circular ring is fixed to the outer wall of the guide sleeve, and a plurality of through holes are opened on the circular ring along its own axial direction. A lap groove is opened at one end of the protective shell corresponding to the fixed shell, and an annular protrusion is protruded along the outer wall of the circular ring along its own circumference to cooperate with the lap groove.

7. The crawler traction hydraulic station according to claim 1, characterized in that: Protective nets are provided at positions of the outer wall of the support tube corresponding to the first annular groove and the second annular groove, and the protective nets respectively confine the corresponding filter materials in the first annular groove and the second annular groove.

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