Linkage control system for chain lubricating oil and hydraulic motor oil drainage

Abstract

The utility model provides a linkage control system for chain lubricating oil and hydraulic motor oil drainage, which relates to the technical field of excavator hydraulic systems and comprises a hydraulic motor, a piston cylinder, a lubricating oil tank, a first one-way valve and a third one-way valve. One end of the first oil way communicates with the first cavity of the piston cylinder, and the other end communicates with an oil return port of the hydraulic motor; one end of the first passage communicates with the second cavity of the piston cylinder, and the other end communicates with an inlet of the lubricating oil tank; one end of the lubricating oil circuit is communicated with an outlet of the lubricating oil tank, and the other end of the lubricating oil circuit is a chain lubricating oil outlet for discharging lubricating oil in the lubricating oil tank through the lubricating oil circuit to lubricate a chain; one end of the first oil drainage way communicates with an oil drainage port of the hydraulic motor, and the other end of the first oil drainage way communicates with an oil outlet of the hydraulic control one-way valve so that hydraulic oil in the hydraulic motor shell can be drained into the lubricating oil way from the first oil drainage way. When the chain rotates, the chain is lubricated through constant-pressure oil drainage of the lubricating oil tank or oil drainage in the shell of the hydraulic motor in a switchable mode.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic system technology for excavators, and in particular to a chain lubrication and hydraulic motor oil drain linkage control system. Background Technology

[0002] Currently, excavators typically transmit power through a hydraulic system to control the head changer and perform various actions. The excavator's hydraulic system is an assembly that organically connects various hydraulic components via pipelines according to the transmission requirements of the head changer and other mechanisms. The hydraulic motor is the actuator of the excavator's hydraulic system, converting the pressure energy of the hydraulic oil into mechanical energy to drive the chain of the head changer to rotate, thereby driving the head changer to perform various actions. As the main transmission component of the head changer, the chain inevitably experiences wear or rust due to frequent use. Therefore, to prevent the chain from jamming, blocking, or even breaking during rotation, it is usually lubricated while rotating to ensure normal chain operation.

[0003] In existing technologies, chain lubrication typically utilizes hydraulic oil within the hydraulic motor housing. When the hydraulic motor drives the chain to rotate, hydraulic oil from the motor housing is drained through the motor's drain port and guided to the chain via hydraulic lines, thus lubricating it. However, this method continuously consumes hydraulic oil from the excavator's hydraulic system. Excessive oil consumption can lead to system malfunction, and hydraulic oil is expensive, making it unsuitable for wasting excessive amounts of oil on chain lubrication. Utility Model Content

[0004] The purpose of this invention is to provide a chain lubrication and hydraulic motor oil drain linkage control system to solve at least one of the aforementioned technical problems in the prior art.

[0005] To solve the above-mentioned technical problems, this utility model provides a chain lubrication and hydraulic motor oil drain linkage control system, including: a hydraulic motor, a first oil circuit, a piston cylinder, a first passage, a lubricating oil tank, a lubricating oil circuit, an air intake passage, a second back pressure check valve, a hydraulic control check valve, a control oil circuit, a first drain oil circuit, a first check valve, and a third check valve.

[0006] The hydraulic motor is used to drive the chain to rotate;

[0007] One end of the first oil circuit is connected to the first chamber of the piston cylinder, and the other end is connected to the return port of the hydraulic motor, for supplying hydraulic oil from the first oil circuit to the first chamber of the piston cylinder or discharging hydraulic oil from the first chamber of the piston cylinder.

[0008] One end of the first passage is connected to the second chamber of the piston cylinder, and the other end is connected to the inlet of the lubricating oil tank, for discharging gas from the second chamber of the piston cylinder and supplying gas to the lubricating oil tank;

[0009] One end of the lubricating oil circuit is connected to the outlet of the lubricating oil tank, and the other end is set as the chain lubrication oil outlet. The chain lubrication oil outlet is located above the chain, so that the lubricating oil in the lubricating oil tank can be discharged from the chain lubrication oil outlet through the lubricating oil circuit and flow onto the chain to lubricate the chain.

[0010] Among them, the lubricating oil can be engine oil or waste hydraulic oil, which has a low cost;

[0011] One end of the air intake passage is connected to the second chamber of the piston cylinder, and the other end is connected to the atmosphere, for the second chamber of the piston cylinder to draw in air;

[0012] A second back pressure check valve is provided on the intake passage. The inlet of the second back pressure check valve is connected to the other end of the intake passage, and the outlet of the second back pressure check valve is connected to the second chamber of the piston cylinder. This is used to allow gas to flow unidirectionally from the intake passage to the second chamber of the piston cylinder, preventing gas from being discharged from the intake passage.

[0013] The hydraulic control check valve is installed in the lubrication oil circuit. The outlet of the hydraulic control check valve is connected to the outlet of the lubrication oil tank, and the inlet of the hydraulic control check valve is connected to the chain lubrication outlet. The control port of the hydraulic control check valve is connected to the first oil circuit through the control oil circuit. It is used to control the opening and closing of the lubrication oil circuit through the hydraulic control check valve. When the hydraulic oil flows in the first oil circuit in the forward direction (i.e., the hydraulic oil flows from the first oil circuit to the first chamber of the piston cylinder), the outlet and inlet of the hydraulic control check valve are connected, and the lubrication oil is discharged from the chain lubrication outlet through the lubrication oil circuit. When the hydraulic oil flows in the reverse direction (i.e., the hydraulic oil in the first chamber of the piston cylinder is discharged from the first oil circuit) or does not flow, the lubrication oil cannot flow through the hydraulic control check valve.

[0014] One end of the first drain oil passage is connected to the drain port of the hydraulic motor, and the other end is connected to the outlet of the hydraulic control check valve. The hydraulic oil in the hydraulic motor housing is drained from the first drain oil passage into the lubrication oil passage, and then discharged from the chain lubrication outlet through the lubrication oil passage to lubricate the chain.

[0015] The first check valve is installed in the first drain oil line. The oil inlet of the first check valve is connected to the oil drain port of the hydraulic motor, and the oil outlet of the first check valve is connected to the oil outlet of the hydraulic control check valve. It is used to prevent lubricating oil from flowing back into the hydraulic motor from the first drain oil line when the lubricating oil tank is drained.

[0016] The third check valve is installed in the lubricating oil circuit. The inlet of the third check valve is connected to the outlet of the lubricating oil tank, and the outlet of the third check valve is connected to the outlet of the hydraulic control check valve. It is used to prevent hydraulic oil from flowing back into the lubricating oil tank from the lubricating oil circuit when the hydraulic motor housing leaks oil.

[0017] Furthermore, the chain lubrication and hydraulic motor drain linkage control system also includes a second drain oil circuit and a second check valve;

[0018] One end of the second drain oil passage is connected to the drain port of the hydraulic motor, and the other end is connected to the first oil passage. It is used to drain the hydraulic oil in the hydraulic motor housing from the first oil passage through the second drain oil passage at the moment the hydraulic motor stops rotating.

[0019] The second check valve is installed in the second drain oil line. The inlet of the second check valve is connected to the drain port of the hydraulic motor, and the outlet of the second check valve is connected to the first oil line. It is used to prevent hydraulic oil from flowing back into the hydraulic motor from the second drain oil line when hydraulic oil is supplied to the first chamber of the piston cylinder or when hydraulic oil in the first chamber of the piston cylinder is discharged.

[0020] Optionally, the hydraulic control check valve is installed in the first drain oil circuit. The outlet of the hydraulic control check valve is connected to the drain port of the hydraulic motor, and the inlet of the hydraulic control check valve is connected to the lubrication oil circuit. It is used to control the opening and closing of the first drain oil circuit through the hydraulic control check valve. When the hydraulic oil flows in the first oil circuit in the forward direction, the outlet of the hydraulic control check valve is connected to the inlet. The hydraulic oil in the hydraulic motor housing drains from the first drain oil circuit into the lubrication oil circuit, and is discharged from the chain lubrication outlet through the lubrication oil circuit, flowing onto the chain to lubricate the chain.

[0021] The third check valve is not installed on the lubrication oil circuit.

[0022] Furthermore, the chain lubrication and hydraulic motor drain linkage control system also includes a first shut-off valve, which is installed on the first drain oil line and is used to regulate the opening and closing of the first drain oil line.

[0023] Preferably, the first check valve is not provided on the first drain line, and the first shut-off valve is located between the drain port of the hydraulic motor and the outlet port of the hydraulic control check valve.

[0024] Furthermore, the chain lubrication and hydraulic motor oil drain linkage control system also includes a second shut-off valve, which is installed in the first oil circuit and is used to regulate the opening and closing of the first oil circuit.

[0025] Preferably, the second shut-off valve is disposed between the first chamber of the piston cylinder and the other end of the second drain oil passage.

[0026] Furthermore, the first passage is provided with the pressure reducing valve, the inlet of the pressure reducing valve is connected to the second chamber of the piston cylinder, and the outlet of the pressure reducing valve is connected to the inlet of the lubricating oil tank, so that the gas pressure is reduced to the set pressure after the gas flows through the pressure reducing valve in the forward direction, and the gas pressure in the lubricating oil tank is maintained at the set pressure.

[0027] By installing a second back pressure check valve in the air intake passage and a hydraulic control check valve in the lubrication oil line, the sealing state of the lubrication oil tank is maintained. Furthermore, by installing a pressure reducing valve in the first passage to control the air pressure in the lubrication oil tank to be constant, constant pressure oil discharge from the lubrication oil tank is achieved, ensuring that the lubrication oil is continuously and stably discharged from the chain lubrication outlet to lubricate the chain. Since there is no need to waste hydraulic oil in the excavator's hydraulic system, the cost of chain lubrication is greatly reduced.

[0028] Furthermore, a fourth one-way valve is provided on the first passage. The fourth one-way valve is located between the pressure reducing valve and the lubricating oil tank. The inlet of the fourth one-way valve is connected to the outlet of the pressure reducing valve, and the outlet of the fourth one-way valve is connected to the inlet of the lubricating oil tank. It is used to allow gas to flow unidirectionally from the first passage into the lubricating oil tank, and to prevent gas and / or lubricating oil from flowing from the first passage into the second chamber of the piston cylinder.

[0029] Furthermore, the chain lubrication and hydraulic motor oil drain linkage control system also includes an overflow path and a safety overflow valve;

[0030] One end of the overflow passage is connected to the first passage and is connected between the pressure reducing valve and the lubricating oil tank;

[0031] The air inlet of the safety relief valve is connected to the other end of the relief path. When the outlet pressure of the pressure reducing valve exceeds the maximum gas pressure that the lubricating oil tank can withstand, gas overflows from the air outlet of the safety relief valve through the relief path, thereby maintaining the stability of the gas pressure in the lubricating oil tank and protecting the safety of the chain lubrication and hydraulic motor oil drain linkage control system.

[0032] In one feasible implementation, the pressure reducing valve is not provided on the first passage. The safety relief valve is used to allow gas to overflow from the outlet of the safety relief valve through the relief passage when the gas pressure in the lubricating oil tank exceeds the set pressure, thereby controlling the gas pressure in the lubricating oil tank to be maintained at the set pressure.

[0033] Furthermore, the chain lubrication and hydraulic motor oil drain linkage control system also includes an oil supply circuit and an oil return circuit;

[0034] One end of the oil supply circuit is connected to the oil inlet of the hydraulic motor, and is used to supply hydraulic oil into the hydraulic motor.

[0035] One end of the return oil circuit is connected to the return oil port of the hydraulic motor, and is used for the return of hydraulic oil in the hydraulic motor.

[0036] The other end of the first oil circuit is connected to the return oil circuit.

[0037] Furthermore, the chain lubrication and hydraulic motor oil drain linkage control system also includes a hydraulic oil source, and the other end of the oil supply circuit is connected to the hydraulic oil source, so that the hydraulic oil from the hydraulic oil source flows into the oil supply circuit.

[0038] Furthermore, the chain lubrication and hydraulic motor oil drain linkage control system also includes a return oil tank, and the other end of the return oil circuit is connected to the return oil tank for hydraulic oil to flow back from the return oil circuit into the return oil tank.

[0039] Furthermore, a first back pressure check valve is provided on the return oil line. The inlet of the first back pressure check valve is connected to the return oil port of the hydraulic motor, and the outlet of the first back pressure check valve is connected to the return oil tank, so that hydraulic oil can flow unidirectionally from the return oil line to the return oil tank.

[0040] When the other end of the first oil circuit is connected to the return oil circuit, the other end of the first oil circuit is connected between the hydraulic motor and the first back pressure check valve. The hydraulic oil flowing out of the return oil port of the hydraulic motor flows to the first back pressure check valve, and the first back pressure check valve generates back pressure, forcing the hydraulic oil to flow from the first oil circuit into the first chamber of the piston cylinder.

[0041] Furthermore, a filter is also provided in the air intake passage. The filter is located on the inlet side of the second back pressure check valve and is used to filter impurities in the air.

[0042] Furthermore, a throttle valve is provided in the lubrication oil circuit to regulate the flow rate of the lubrication oil circuit, thereby regulating the oil discharge speed of the chain lubrication outlet.

[0043] Furthermore, the second chamber of the piston cylinder is provided with a tube on the side opposite to the first chamber, and the second chamber of the piston cylinder is connected to the first passage through the tube;

[0044] The piston of the piston cylinder has a push rod on the end face opposite to the first chamber. The push rod is slidably disposed in the tube body and is used to support the push rod through the tube body to prevent the piston from tilting during sliding, which would cause wear on the cylinder wall of the piston cylinder.

[0045] Furthermore, the piston cylinder has an air intake port on its cylinder wall, the air intake port is connected to the second chamber of the piston cylinder, and one end of the air intake passage is connected to the air intake port.

[0046] Furthermore, the air intake is disposed on the wall of the tube body;

[0047] When air is drawn into the second chamber of the piston cylinder, the air flows into the tube and into the second chamber through the gap between the tube and the push rod.

[0048] Furthermore, a compression spring is provided in the second chamber of the piston cylinder, and the compression spring is sleeved on the push rod;

[0049] The compression spring is disposed between the tube and the piston. One end of the compression spring abuts against the tube and the other end abuts against the piston. It is used to push the piston into the first chamber of the piston cylinder by the elastic force of the compression spring, thereby forcing the hydraulic oil in the first chamber of the piston cylinder to be discharged.

[0050] Furthermore, a first partition is provided inside the lubricating oil tank, which divides the lubricating oil tank into an air inlet chamber and an oil outlet chamber from top to bottom.

[0051] The inlet of the lubricating oil tank is connected to the air intake chamber;

[0052] The outlet of the lubricating oil tank is connected to the oil outlet chamber;

[0053] A first through hole is provided at the first corner of the first partition, and the air inlet chamber and the oil outlet chamber are connected through the first through hole for the lubricating oil and gas in the lubricating oil tank to flow between the air inlet chamber and the oil outlet chamber;

[0054] During use, the lubricating oil tank is not tilted or tilted in any direction away from the first through hole. When the level of the lubricating oil in the oil outlet chamber is higher than the outlet of the lubricating oil tank, air is supplied to the lubricating oil tank through the piston cylinder, and the lubricating oil can be discharged from the outlet of the lubricating oil tank, thereby using the lubricating oil to lubricate the chain.

[0055] Furthermore, a second partition is also provided inside the lubricating oil tank. The second partition is located below the first partition, and the lubricating oil tank is divided from top to bottom into an air inlet chamber, an intermediate chamber, and an oil outlet chamber by the first partition and the second partition.

[0056] The second partition has a second through hole at the opposite corner of the first corner. The air inlet chamber, the intermediate chamber and the oil outlet chamber are connected in sequence through the first through hole and the second through hole, so that the lubricating oil and gas in the lubricating oil tank can flow between the air inlet chamber, the intermediate chamber and the oil outlet chamber.

[0057] During use, when the lubricating oil tank is not tilted or tilted in any direction, and the level of the lubricating oil in the oil outlet chamber is higher than the outlet of the lubricating oil tank, air is supplied to the lubricating oil tank through the piston cylinder, and the lubricating oil can be discharged from the outlet of the lubricating oil tank, thereby using the lubricating oil to lubricate the excavator chain.

[0058] In one feasible implementation, a third back pressure check valve is provided on the first passage. The inlet of the third back pressure check valve is connected to the second chamber of the piston cylinder, and the outlet of the third back pressure check valve is connected to the inlet of the lubricating oil tank, so as to supply gas in the second chamber of the piston cylinder to the lubricating oil tank in one direction.

[0059] In one feasible implementation, a fourth one-way valve is provided on the first passage. The inlet of the fourth one-way valve is connected to the second chamber of the piston cylinder, and the outlet of the fourth one-way valve is connected to the inlet of the lubricating oil tank, so as to supply gas in the second chamber of the piston cylinder to the lubricating oil tank in one direction.

[0060] By adopting the above technical solution, this utility model has the following beneficial effects:

[0061] This utility model provides a chain lubrication and hydraulic motor oil discharge linkage control system, which enables the chain to be lubricated by either constant pressure discharge from the lubrication tank or oil discharge from the hydraulic motor housing when the hydraulic motor drives the chain to rotate. The lubricant is discharged from the chain lubrication outlet, reducing excessive waste of hydraulic oil in the excavator's hydraulic system and greatly reducing the cost of chain lubrication. Attached Figure Description

[0062] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0063] Figure 1 A schematic diagram of the chain lubrication and hydraulic motor oil drain linkage control system provided in Embodiment 1 of this utility model;

[0064] Figure 2This is a schematic diagram of the chain lubrication and hydraulic motor oil drain linkage control system provided in Embodiment 4 of the present invention;

[0065] Figure 3 A cross-sectional view of the piston cylinder provided in this embodiment of the present invention when the second chamber space is compressed to its minimum size;

[0066] Figure 4 for Figure 3 The diagram shows a cross-sectional view of the piston cylinder when the first chamber space is compressed to its minimum.

[0067] Figure 5 This is a schematic diagram of the structure of the lubricating oil tank provided in an embodiment of the present utility model;

[0068] Figure 6 for Figure 5 The diagram shows the internal structure of the lubricating oil tank.

[0069] Figure 7 for Figure 5 The diagram shows the internal structure of the lubricating oil tank when it is tilted in a direction away from the first through hole;

[0070] Figure 8 for Figure 5 The diagram shows a front perspective view of the lubricating oil tank tilted along its length toward the side away from the first through hole.

[0071] Figure 9 for Figure 5 The side perspective view of the lubricating oil tank shown is tilted away from the first through hole along its width.

[0072] Figure 10 This is a schematic diagram of the internal structure of a lubricating oil tank according to another embodiment of the present invention;

[0073] Figure 11 for Figure 10 The diagram shows a perspective view of the lubricating oil tank tilted to both sides along its length.

[0074] Figure 12 for Figure 10 The diagram shows a side perspective view of the lubricating oil tank tilted to both sides along its width.

[0075] Figure label:

[0076] 1-Hydraulic motor; 2-Piston cylinder; 21-First chamber; 22-Second chamber; 221-Intake port; 23-Piston; 24-Pipe body; 25-Push rod; 26-Compression spring; 3-Lubricating oil tank; 301-Inlet of lubricating oil tank; 302-Outlet of lubricating oil tank; 31-First partition; 311-First through hole; 32-Second partition; 321-Second through hole; 33-Intake chamber; 34-Intermediate chamber; 35-Outlet chamber; 4-First back pressure check valve; 5-Second back pressure check valve; 6-Third back pressure check valve; 7-Filter; 8-Fourth check valve; 9-Throttle valve; 10-Hydraulic control check valve; 11-Pressure reducing valve; 12-Safety relief valve; 13-First check valve; 14-Third check valve; 15-Second check valve; 16-First shut-off valve; 17-Second shut-off valve. Detailed Implementation

[0077] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0078] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0079] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0080] The present invention will be further explained below with reference to specific embodiments.

[0081] It should also be noted that the specific embodiments or implementation methods described below are a series of optimized settings listed by this utility model to further explain the specific utility model content, and these settings can be combined or used in conjunction with each other.

[0082] Example 1

[0083] like Figure 1 As shown, this embodiment provides a chain lubrication and hydraulic motor drain linkage control system, including: a hydraulic motor 1, a first oil circuit, a piston cylinder 2, a first passage, a lubrication oil tank 3, a lubrication oil circuit, an intake passage, a second back pressure check valve 5, a hydraulically controlled check valve 10, a control oil circuit, a first drain oil circuit, a first check valve 13, and a third check valve 14; the hydraulic motor 1 is used to drive the chain to rotate; one end of the first oil circuit is connected to the first chamber of the piston cylinder 2, and the other end is connected to the return port of the hydraulic motor 1, for supplying hydraulic oil from the hydraulic motor 1 to the first chamber of the piston cylinder 2 from the first oil circuit or... The first passage is used to discharge hydraulic oil from the first chamber of the piston cylinder 2; one end of the first passage is connected to the second chamber of the piston cylinder 2, and the other end is connected to the inlet of the lubricating oil tank 3, for discharging gas from the second chamber of the piston cylinder 2 and supplying gas to the lubricating oil tank 3; one end of the lubricating oil passage is connected to the outlet of the lubricating oil tank 3, and the other end is set as a chain lubrication outlet, which is located above the chain, for discharging lubricating oil from the lubricating oil tank 3 through the lubricating oil passage from the chain lubrication outlet, flowing onto the chain to lubricate the chain; wherein, the lubricating oil can be machine oil or waste hydraulic oil, which has a low cost.

[0084] One end of the intake passage is connected to the second chamber of the piston cylinder 2, and the other end is connected to the atmosphere, for the second chamber of the piston cylinder 2 to draw in air; a second back pressure one-way valve 5 is provided on the intake passage, the inlet of the second back pressure one-way valve 5 is connected to the other end of the intake passage, and the outlet of the second back pressure one-way valve 5 is connected to the second chamber of the piston cylinder 2, for gas to flow unidirectionally from the intake passage to the second chamber of the piston cylinder 2, preventing gas from being discharged from the intake passage, and when the piston cylinder 2 is stationary, air cannot flow into the second chamber of the piston cylinder 2 from the intake passage through the second back pressure one-way valve 5.

[0085] The hydraulically controlled check valve 10 is installed in the lubrication oil circuit. The outlet of the hydraulically controlled check valve 10 is connected to the outlet of the lubrication oil tank 3, and the inlet of the hydraulically controlled check valve 10 is connected to the chain lubrication outlet. The control port of the hydraulically controlled check valve 10 is connected to the first oil circuit through the control oil circuit, and is used to control the opening and closing of the lubrication oil circuit through the hydraulically controlled check valve 10. Hydraulic oil flows forward in the first oil circuit (i.e., hydraulic oil flows from the first oil circuit to the first piston cylinder 2). When the hydraulic oil flows in the first oil passage (i.e., the hydraulic oil in the first chamber of the piston cylinder 2 is discharged from the chain lubrication outlet), the lubricating oil cannot flow through the hydraulic control check valve 10 when the hydraulic oil flows in the reverse direction (i.e., the hydraulic oil in the first chamber of the piston cylinder 2 is discharged from the first oil passage) or does not flow. One end of the first drain oil passage is connected to the drain port of the hydraulic motor 1, and the other end is connected to the outlet of the hydraulic control check valve 10, for use in the housing of the hydraulic motor 1. Hydraulic oil is drained from the first drain oil path into the lubrication oil path, and then discharged from the chain lubrication outlet through the lubrication oil path to lubricate the chain. The first check valve 13 is installed on the first drain oil path, with its inlet connected to the drain port of the hydraulic motor 1 and its outlet connected to the outlet of the hydraulically controlled check valve 10. This prevents lubricating oil from flowing back into the hydraulic motor 1 from the first drain oil path when the lubrication oil tank 3 is draining. During use, the amount of hydraulic oil drained from the drain port of the hydraulic motor 1 is much smaller than the amount of lubricating oil discharged from the outlet of the lubrication oil tank 3. The third check valve 14 is installed on the lubrication oil path, with its inlet connected to the outlet of the lubrication oil tank 3 and its outlet connected to the outlet of the hydraulically controlled check valve 10. This prevents hydraulic oil from flowing back into the lubrication oil tank 3 from the lubrication oil path when the housing of the hydraulic motor 1 is draining.

[0086] The chain lubrication and hydraulic motor drain linkage control system further includes a second drain oil circuit and a second one-way valve 15. One end of the second drain oil circuit is connected to the drain port of the hydraulic motor 1, and the other end is connected to the first oil circuit. It is used to drain the hydraulic oil in the housing of the hydraulic motor 1 through the second drain oil circuit from the first oil circuit at the instant the hydraulic motor 1 stops rotating. The second one-way valve 15 is arranged on the second drain oil circuit. The inlet of the second one-way valve 15 is connected to the drain port of the hydraulic motor, and the outlet of the second one-way valve 15 is connected to the first oil circuit. It is used to prevent the hydraulic oil from flowing back into the hydraulic motor 1 from the second drain oil circuit when supplying hydraulic oil to the first chamber of the piston cylinder 2 or when discharging the hydraulic oil from the first chamber of the piston cylinder 2.

[0087] Based on the above technical solution, in another alternative embodiment, the hydraulic control check valve 10 is installed in the first drain oil circuit. The outlet of the hydraulic control check valve 10 is connected to the drain port of the hydraulic motor 1, and the inlet of the hydraulic control check valve 10 is connected to the lubrication oil circuit. It is used to control the opening and closing of the first drain oil circuit through the hydraulic control check valve 10. When the hydraulic oil flows in the first oil circuit in the forward direction, the outlet of the hydraulic control check valve 10 is connected to the inlet. The hydraulic oil in the housing of the hydraulic motor 1 is drained from the first drain oil circuit into the lubrication oil circuit, and discharged from the chain lubrication outlet through the lubrication oil circuit to lubricate the chain. The third check valve 14 is not installed in the lubrication oil circuit.

[0088] In this embodiment, the chain lubrication and hydraulic motor drain linkage control system further includes a first shut-off valve 16. The first shut-off valve 16 is disposed on the first drain oil path, between the oil outlet of the first check valve 13 and the oil outlet of the hydraulic check valve 10, and is used to adjust the opening and closing of the first drain oil path.

[0089] In one feasible embodiment, the first check valve 13 is not provided in the first drain oil line, and the first shut-off valve 16 is provided between the drain port of the hydraulic motor 1 and the outlet port of the hydraulic control check valve 10.

[0090] More preferably, the chain lubrication and hydraulic motor oil drain linkage control system further includes a second shut-off valve 17, which is disposed on the first oil circuit and is used to regulate the opening and closing of the first oil circuit.

[0091] In this embodiment, the second shut-off valve 17 is disposed between the first chamber of the piston cylinder 2 and the other end of the second drain oil passage.

[0092] In use, the first shut-off valve 16 is closed and the second shut-off valve 17 is opened. Hydraulic oil flows from the first oil passage into the first chamber of the piston cylinder 2, pushing the piston in the second chamber of the piston cylinder 2, forcing the gas in the second chamber of the piston cylinder 2 to be discharged until the space in the second chamber of the piston cylinder 2 is compressed to the minimum by the piston. Since the gas discharged from the second chamber of the piston cylinder 2 cannot be discharged from the suction passage through the second back pressure check valve 5, the gas flows from the first passage through the pressure reducing valve 11 to the set pressure and then flows into the lubricating oil tank 3, thereby controlling the gas pressure in the lubricating oil tank 3 to be maintained at the set pressure. At the same time, hydraulic oil flows from the first oil passage through the control oil passage to the control port of the hydraulic control check valve 10. The control port of the hydraulic control check valve 10 receives a pressure signal and controls the oil outlet and oil inlet of the hydraulic control check valve 10 to connect, and the hydraulic control check valve 10 opens. After the gas flows into the lubricating oil tank 3 from the first passage, the lubricating oil... As the gas inside the oil tank 3 increases, the gas pressure inside the lubricating oil tank 3 becomes greater than the external gas pressure, forcing the lubricating oil in the lubricating oil tank 3 to be discharged from the outlet of the lubricating oil tank 3 at a constant pressure. The total amount of lubricating oil discharged from the lubricating oil tank 3 is determined by the total amount of air discharged from the second chamber of the piston cylinder 2. After the lubricating oil is discharged from the outlet of the lubricating oil tank 3 at a constant pressure, it is discharged from the chain lubrication outlet through the lubrication oil passage and flows onto the chain to lubricate it. After lubricating the chain, the piston is pushed into the second chamber of the piston cylinder 2 by its own weight or under the action of external force, forcing the hydraulic oil in the first chamber of the piston cylinder 2 to be discharged from the first oil passage until the space in the first chamber of the piston cylinder 2 is compressed to a minimum by the piston. At the same time, the second chamber of the piston cylinder 2 draws in air from the air intake passage, and the air flows into the second chamber of the piston cylinder 2 through the second back pressure check valve 5. When the first shut-off valve 16 is closed, the hydraulic oil in the hydraulic motor housing is discharged from the second drain oil passage.

[0093] In use, the first shut-off valve 16 is opened and the second shut-off valve 17 is closed. Hydraulic oil cannot flow from the first oil circuit into the piston cylinder 2 through the second shut-off valve 17. The hydraulic oil flows from the first oil circuit to the control oil circuit to the control port of the hydraulic control check valve 10. The control port of the hydraulic control check valve 10 receives a pressure signal and controls the oil outlet and oil inlet of the hydraulic control check valve 10 to connect, thus opening the hydraulic control check valve 10. The hydraulic oil in the housing of the hydraulic motor 1 flows from the drain port of the hydraulic motor 1 into the first drain oil circuit, and then flows through the lubrication oil circuit to the chain lubrication outlet, flowing onto the chain to lubricate it. At the instant the hydraulic motor 1 stops rotating, the control port of the hydraulic control check valve 10 loses the pressure signal, the hydraulic control check valve 10 closes, and the hydraulic oil in the housing of the hydraulic motor 1 is discharged from the first oil circuit through the second drain oil circuit.

[0094] Furthermore, the first passage is provided with the pressure reducing valve 11, the inlet of the pressure reducing valve 11 is connected to the second chamber of the piston cylinder 2, and the outlet of the pressure reducing valve 11 is connected to the inlet of the lubricating oil tank 3, so that the gas pressure is reduced to the set pressure after the gas flows through the pressure reducing valve 11 in the forward direction, and the gas pressure in the lubricating oil tank 3 is maintained at the set pressure.

[0095] By setting a second back pressure check valve 5 in the air intake passage and a hydraulic control check valve 10 in the lubrication oil line, the sealing state of the lubrication oil tank 3 is maintained. Then, by setting a pressure reducing valve 11 in the first passage to control the constant air pressure in the lubrication oil tank 3, the constant pressure oil discharge of the lubrication oil tank 3 is achieved, ensuring that the lubrication oil is continuously and stably discharged from the chain lubrication outlet to lubricate the chain. Since there is no need to waste the hydraulic oil in the excavator's hydraulic system, the cost of chain lubrication is greatly reduced.

[0096] In this embodiment, a fourth one-way valve 8 is provided on the first passage. The fourth one-way valve 8 is located between the pressure reducing valve 11 and the lubricating oil tank 3. The inlet of the fourth one-way valve 8 is connected to the outlet of the pressure reducing valve 11, and the outlet of the fourth one-way valve 8 is connected to the inlet of the lubricating oil tank 3. It is used to allow gas to flow unidirectionally from the first passage into the lubricating oil tank 3, preventing gas and / or lubricating oil from flowing from the first passage into the second chamber of the piston cylinder 2. When air is drawn into the second chamber of the piston cylinder 2, the gas and / or lubricating oil in the lubricating oil tank 3 cannot flow into the second chamber of the piston cylinder 2 from the first passage through the fourth one-way valve 8.

[0097] More preferably, the chain lubrication and hydraulic motor oil drain linkage control system further includes an overflow path and a safety overflow valve 12; one end of the overflow path is connected to the first passage and is connected between the pressure reducing valve 11 and the lubricating oil tank 3; the air inlet of the safety overflow valve 12 is connected to the other end of the overflow path, and is used to allow gas to overflow from the air outlet of the safety overflow valve 12 through the overflow path when the outlet pressure of the pressure reducing valve 11 exceeds the maximum gas pressure that the lubricating oil tank 3 can withstand, thereby maintaining the stable gas pressure in the lubricating oil tank 3 and protecting the safety of the chain lubrication and hydraulic motor oil drain linkage control system; if the gas pressure fails to decrease to the set pressure after the gas flows through the pressure reducing valve 11, the gas pressure is reduced to the set pressure by allowing part of the gas to overflow through the safety overflow valve 12, thereby maintaining a constant gas pressure in the lubricating oil tank 3.

[0098] Furthermore, the chain lubrication and hydraulic motor oil drain linkage control system also includes an oil supply circuit and an oil return circuit; one end of the oil supply circuit is connected to the oil inlet of the hydraulic motor 1 for supplying hydraulic oil to the hydraulic motor 1; one end of the oil return circuit is connected to the oil return port of the hydraulic motor 1 for returning hydraulic oil from the hydraulic motor 1; the other end of the first oil circuit is connected to the oil return circuit, and when the hydraulic motor 1 is running, hydraulic oil is supplied from the first oil circuit to the first chamber of the piston cylinder 2, thereby realizing that while the hydraulic motor 1 drives the chain to rotate, the lubrication oil tank 3 discharges oil at constant pressure, and the lubricating oil is continuously and stably discharged from the chain lubrication outlet to lubricate the chain.

[0099] In this embodiment, the chain lubrication and hydraulic motor oil drain linkage control system further includes a hydraulic oil source, and the other end of the oil supply circuit is connected to the hydraulic oil source, so that the hydraulic oil from the hydraulic oil source flows into the oil supply circuit.

[0100] Furthermore, the chain lubrication and hydraulic motor oil drain linkage control system also includes a return oil tank, and the other end of the return oil circuit is connected to the return oil tank for hydraulic oil to flow back from the return oil circuit into the return oil tank.

[0101] More preferably, a first back pressure check valve 4 is provided on the return oil line. The inlet of the first back pressure check valve 4 is connected to the return oil port of the hydraulic motor 1, and the outlet of the first back pressure check valve 4 is connected to the return oil tank, so that hydraulic oil can flow unidirectionally from the return oil line to the return oil tank. When the other end of the first oil line is connected to the return oil line, the other end of the first oil line is connected between the hydraulic motor 1 and the first back pressure check valve 4. The hydraulic oil flowing out of the return oil port of the hydraulic motor 1 flows to the first back pressure check valve 4, and the first back pressure check valve 4 generates back pressure, forcing the hydraulic oil to flow from the first oil line into the first chamber of the piston cylinder 2.

[0102] In this embodiment, a filter 7 is also provided on the air intake passage. The filter 7 is located on the inlet side of the second back pressure check valve 5 and is used to filter impurities in the air.

[0103] More preferably, a throttle valve 9 is provided on the lubrication oil circuit to adjust the flow rate of the lubrication oil circuit, thereby adjusting the oil discharge speed of the chain lubrication outlet.

[0104] Furthermore, the piston cylinder 2 is a single-acting piston cylinder 2 that pushes the piston into the second chamber of the piston cylinder 2 by hydraulic oil, and the piston can be reset by its own weight or by external force.

[0105] This invention enables the chain to be lubricated by either constant pressure oil discharge from the lubrication tank 3 or oil discharge from the housing of the hydraulic motor 1 when the hydraulic motor 1 drives the chain to rotate. The lubricant is discharged from the chain lubrication outlet, reducing excessive waste of hydraulic oil in the excavator's hydraulic system and greatly reducing the cost of chain lubrication.

[0106] Example 2

[0107] This embodiment is basically the same as embodiment 1, except that:

[0108] This embodiment provides a chain lubrication and hydraulic motor oil drain linkage control system. The pressure reducing valve 11 is not provided in the first passage. The safety overflow valve 12 is used to overflow gas through the overflow passage from the outlet of the safety overflow valve 12 when the gas pressure in the lubricating oil tank 3 exceeds the set pressure, thereby controlling the gas pressure in the lubricating oil tank 3 to be maintained at the set pressure.

[0109] Example 3

[0110] This embodiment is basically the same as embodiment 1, except that:

[0111] This embodiment provides a chain lubrication and hydraulic motor oil drain linkage control system. The first passage is equipped with only a fourth check valve 8. The outlet of the fourth check valve 8 is connected to the inlet of the lubricating oil tank 3, allowing gas to flow unidirectionally from the first passage into the lubricating oil tank 3, preventing gas and / or lubricating oil from flowing from the first passage into the second chamber of the piston cylinder 2. This effectively controls the amount of gas discharged from the piston cylinder 2 by controlling its capacity. The gas discharged from the piston cylinder 2 enters the lubricating oil tank 3 through the fourth check valve 8, thus making the amount of lubricating oil discharged from the lubricating oil tank 3 quantitatively controllable. Simultaneously, when air is drawn into the second chamber of the piston cylinder 2, the gas and / or lubricating oil in the lubricating oil tank 3 cannot flow into the second chamber of the piston cylinder 2 from the first passage through the fourth check valve 8.

[0112] Example 4

[0113] like Figure 2 As shown, this embodiment is basically the same as embodiment 1, except that:

[0114] This embodiment provides a chain lubrication and hydraulic motor oil drain linkage control system. No filter 7 is installed on the air intake passage; only a third back pressure check valve 6 is installed on the first passage. The outlet of the third back pressure check valve 6 is connected to the inlet of the lubricating oil tank 3, allowing gas to flow unidirectionally from the first passage into the lubricating oil tank 3, preventing gas and / or lubricating oil from flowing from the first passage into the second chamber of the piston cylinder 2. This effectively controls the amount of gas discharged from the piston cylinder 2 by controlling its capacity. The gas discharged from the piston cylinder 2 enters the lubricating oil tank 3 through the third back pressure check valve 6, thus making the amount of lubricating oil discharged from the lubricating oil tank 3 quantitatively controllable. Simultaneously, when air is drawn into the second chamber of the piston cylinder 2, the gas and / or lubricating oil in the lubricating oil tank 3 cannot flow into the second chamber of the piston cylinder 2 from the first passage through the third back pressure check valve 6.

[0115] Example 5

[0116] This embodiment is basically the same as embodiment 1, except that:

[0117] like Figure 3-4 As shown in the figure, this embodiment provides a chain lubrication and hydraulic motor oil drain linkage control system. The second chamber 22 of the piston cylinder 2 is provided with a tube 24 on the side opposite to the first chamber 21. The second chamber 22 of the piston cylinder 2 is connected to the first passage through the tube 24. The piston 23 of the piston cylinder 2 is provided with a push rod 25 on the end face opposite to the first chamber 21. The push rod 25 is slidably disposed in the tube 24 and is used to support the push rod 25 through the tube 24 to prevent the piston 23 from tilting during sliding and causing wear on the cylinder wall of the piston cylinder 2.

[0118] Furthermore, an air intake port 221 is provided on the cylinder wall of the piston cylinder 2, the air intake port 221 is connected to the second chamber 22 of the piston cylinder 2, and one end of the air intake passage is connected to the air intake port 221.

[0119] More preferably, the air intake 221 is disposed on the wall of the tube body 24; when air is drawn into the second chamber 22 of the piston cylinder 2, the air flows into the tube body 24 and into the second chamber 22 from the gap between the tube body 24 and the push rod 25.

[0120] In this embodiment, the second back pressure check valve 5 is detachably installed on the air intake 221 on the pipe wall of the pipe body 24; the filter 7 is installed at the inlet of the second back pressure check valve 5.

[0121] More preferably, a compression spring 26 is provided in the second chamber 22 of the piston cylinder 2, and the compression spring 26 is sleeved on the push rod 25; the compression spring 26 is located between the tube body 24 and the piston 23, one end of the compression spring 26 abuts against the tube body 24, and the other end abuts against the piston 23, and is used to push the piston 23 towards the first chamber 21 of the piston cylinder 2 by the elastic force of the compression spring 26, thereby forcing the hydraulic oil in the first chamber 21 of the piston cylinder 2 to be discharged.

[0122] Example 6

[0123] This embodiment is basically the same as embodiment 1, except that:

[0124] like Figure 5-9 As shown ( Figure 7-9 (The red dashed line in the middle represents the lubricating oil level). This embodiment provides a chain lubrication and hydraulic motor oil drain linkage control system. The lubricating oil tank 3 is provided with a first partition 31, which divides the lubricating oil tank 3 into an air inlet chamber 33 and an oil outlet chamber 35 from top to bottom. The inlet 301 of the lubricating oil tank 3 is connected to the air inlet chamber 33. The outlet 302 of the lubricating oil tank 3 is connected to the oil outlet chamber 35. A first through hole 311 is provided at the first corner of the first partition 31, and the air inlet chamber 33 and the oil outlet chamber 35 are connected through the first through hole 311, so that the lubricating oil and gas in the lubricating oil tank 3 can flow between the air inlet chamber 33 and the oil outlet chamber 35.

[0125] During use, the lubricating oil tank 3 is not tilted or tilted in any direction away from the first through hole 311. When the level of the lubricating oil in the oil outlet chamber 35 is higher than the outlet 302 of the lubricating oil tank 3, air is supplied to the lubricating oil tank 3 through the piston cylinder 2, and the lubricating oil can be discharged from the outlet 302 of the lubricating oil tank 3, thereby using the lubricating oil to lubricate the chain.

[0126] In this embodiment, the four side walls of the lubricating oil tank 3 are perpendicular to the adjacent tank walls. When the excavator head changing device is operating normally, the lubricating oil tank 3 may tilt along the length or width direction of the lubricating oil tank 3 along with the excavator head changing device.

[0127] More preferably, the outlet 302 of the lubricating oil tank 3 is located at the bottom center of the lubricating oil tank 3.

[0128] In this embodiment, the maximum tilting angle at which the lubricating oil tank 3 can dispense oil when tilted along its length away from the first through hole 311 is 145°, and the maximum tilting angle at which the lubricating oil tank 3 can dispense oil when tilted along its width away from the first through hole 311 is 120°. When the lubricating oil tank 3 is tilted along its length or width without exceeding the maximum tilting angle, the level of the lubricating oil in the oil outlet chamber 35 is higher than the outlet 302 of the lubricating oil tank 3, and the lubricating oil can be discharged from the outlet 302 of the lubricating oil tank 3, thereby lubricating the chain.

[0129] Example 7

[0130] This embodiment is basically the same as embodiment 6, except that:

[0131] like Figure 10-12 As shown ( Figure 11-12 (The red dashed line in the middle represents the lubricating oil level). This embodiment provides a chain lubrication and hydraulic motor oil drain linkage control system. The lubricating oil tank 3 is further provided with a second partition 32, which is located below the first partition 31. The lubricating oil tank 3 is divided from top to bottom by the first partition 31 and the second partition 32 into an air inlet chamber 33, an intermediate chamber 34, and an oil outlet chamber 35. The second partition 32 is provided with a second through hole 321 at the first corner. The air inlet chamber 33, the intermediate chamber 34, and the oil outlet chamber 35 are connected sequentially through the first through hole 311 and the second through hole 321, so that the lubricating oil and gas in the lubricating oil tank 3 can flow between the air inlet chamber 33, the intermediate chamber 34, and the oil outlet chamber 35.

[0132] During use, when the lubricating oil tank 3 is not tilted or tilted in any direction, and the level of the lubricating oil in the oil outlet chamber 35 is higher than the outlet 302 of the lubricating oil tank 3, air is supplied to the lubricating oil tank 3 through the piston cylinder 2, and the lubricating oil can be discharged from the outlet 302 of the lubricating oil tank 3, thereby using the lubricating oil to lubricate the excavator chain.

[0133] In this embodiment, the maximum tilting angle at which the lubricating oil tank 3 can dispense oil when tilted to both sides along its length is 145°, and the maximum tilting angle at which the lubricating oil tank 3 can dispense oil when tilted to both sides along its width is 120°. When the lubricating oil tank 3 is tilted to the maximum tilting angle along its length or width, the level of the lubricating oil in the oil outlet chamber 35 is higher than the outlet 302 of the lubricating oil tank 3, and the lubricating oil can be discharged from the outlet 302 of the lubricating oil tank 3, thereby lubricating the chain.

[0134] In one feasible implementation, a level gauge is provided on the outside of the lubricating oil tank 3. The lowest liquid level height of the level gauge is the same as the height of the first partition 31, and it is used to detect the liquid level height of the lubricating oil in the lubricating oil tank 3.

[0135] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A chain lubrication and hydraulic motor oil drain linkage control system, characterized in that, include: Hydraulic motor, first oil circuit, piston cylinder, first passage, lubricating oil tank, lubricating oil circuit, suction passage, second back pressure check valve, hydraulic control check valve, control oil circuit, first drain oil circuit, first check valve and third check valve; The hydraulic motor is used to drive the chain to rotate; One end of the first oil circuit is connected to the first chamber of the piston cylinder, and the other end is connected to the return port of the hydraulic motor, for supplying hydraulic oil from the first oil circuit to the first chamber of the piston cylinder or discharging hydraulic oil from the first chamber of the piston cylinder. One end of the first passage is connected to the second chamber of the piston cylinder, and the other end is connected to the inlet of the lubricating oil tank, for discharging gas from the second chamber of the piston cylinder and supplying gas to the lubricating oil tank; One end of the lubricating oil circuit is connected to the outlet of the lubricating oil tank, and the other end is set as the chain lubrication oil outlet. The chain lubrication oil outlet is located above the chain, so that the lubricating oil in the lubricating oil tank can be discharged from the chain lubrication oil outlet through the lubricating oil circuit and flow onto the chain to lubricate the chain. One end of the air intake passage is connected to the second chamber of the piston cylinder, and the other end is connected to the atmosphere, for the second chamber of the piston cylinder to draw in air; A second back pressure check valve is provided on the intake passage. The inlet of the second back pressure check valve is connected to the other end of the intake passage, and the outlet of the second back pressure check valve is connected to the second chamber of the piston cylinder. This is used to allow gas to flow unidirectionally from the intake passage to the second chamber of the piston cylinder, preventing gas from being discharged from the intake passage. The hydraulic control check valve is installed on the lubricating oil circuit. The outlet of the hydraulic control check valve is connected to the outlet of the lubricating oil tank, and the inlet of the hydraulic control check valve is connected to the chain lubrication outlet. The control port of the hydraulic control check valve is connected to the first oil circuit through the control oil circuit. It is used to control the opening and closing of the lubricating oil circuit through the hydraulic control check valve. When the hydraulic oil flows in the first oil circuit in the forward direction, the outlet and inlet of the hydraulic control check valve are connected, and the lubricating oil is discharged from the chain lubrication outlet through the lubricating oil circuit. When the hydraulic oil flows in the reverse direction or does not flow in the first oil circuit, the lubricating oil cannot flow through the hydraulic control check valve. One end of the first drain oil passage is connected to the drain port of the hydraulic motor, and the other end is connected to the outlet of the hydraulic control check valve. The hydraulic oil in the hydraulic motor housing is drained from the first drain oil passage into the lubrication oil passage, and then discharged from the chain lubrication outlet through the lubrication oil passage to lubricate the chain. The first check valve is installed in the first drain oil line. The oil inlet of the first check valve is connected to the oil drain port of the hydraulic motor, and the oil outlet of the first check valve is connected to the oil outlet of the hydraulic control check valve. It is used to prevent lubricating oil from flowing back into the hydraulic motor from the first drain oil line when the lubricating oil tank is drained. The third check valve is installed in the lubricating oil circuit. The inlet of the third check valve is connected to the outlet of the lubricating oil tank, and the outlet of the third check valve is connected to the outlet of the hydraulic control check valve. It is used to prevent hydraulic oil from flowing back into the lubricating oil tank from the lubricating oil circuit when the hydraulic motor housing leaks oil.

2. The chain lubrication and hydraulic motor oil drain linkage control system according to claim 1, characterized in that, It also includes a second drain line and a second check valve; One end of the second drain oil passage is connected to the drain port of the hydraulic motor, and the other end is connected to the first oil passage. It is used to drain the hydraulic oil in the hydraulic motor housing from the first oil passage through the second drain oil passage at the moment the hydraulic motor stops rotating. The second check valve is installed in the second drain oil line. The inlet of the second check valve is connected to the drain port of the hydraulic motor, and the outlet of the second check valve is connected to the first oil line. It is used to prevent hydraulic oil from flowing back into the hydraulic motor from the second drain oil line when hydraulic oil is supplied to the first chamber of the piston cylinder or when hydraulic oil in the first chamber of the piston cylinder is discharged.

3. The chain lubrication and hydraulic motor oil drain linkage control system according to claim 1, characterized in that, It also includes a first shut-off valve, which is installed on the first drain oil line and is used to regulate the opening and closing of the first drain oil line.

4. The chain lubrication and hydraulic motor oil drain linkage control system according to claim 3, characterized in that, The first check valve is not installed on the first drain line, and the first shut-off valve is located between the drain port of the hydraulic motor and the outlet port of the hydraulic control check valve.

5. The chain lubrication and hydraulic motor oil drain linkage control system according to claim 2, characterized in that, It also includes a second shut-off valve, which is disposed in the first oil circuit and is used to regulate the on / off state of the first oil circuit.

6. The chain lubrication and hydraulic motor oil drain linkage control system according to claim 5, characterized in that, The second shut-off valve is located between the first chamber of the piston cylinder and the other end of the second drain oil passage.

7. The chain lubrication and hydraulic motor oil drain linkage control system according to claim 1, characterized in that, A pressure reducing valve is provided in the first passage. The inlet of the pressure reducing valve is connected to the second chamber of the piston cylinder, and the outlet of the pressure reducing valve is connected to the inlet of the lubricating oil tank. The valve is used to reduce the gas pressure to the set pressure after the gas flows through the pressure reducing valve in the forward direction, thereby controlling the gas pressure in the lubricating oil tank to be maintained at the set pressure.

8. The chain lubrication and hydraulic motor oil drain linkage control system according to claim 7, characterized in that, A fourth check valve is provided on the first passage. The fourth check valve is located between the pressure reducing valve and the lubricating oil tank. The inlet of the fourth check valve is connected to the outlet of the pressure reducing valve, and the outlet of the fourth check valve is connected to the inlet of the lubricating oil tank. It is used to allow gas to flow unidirectionally from the first passage into the lubricating oil tank and to prevent gas and / or lubricating oil from flowing from the first passage into the second chamber of the piston cylinder.

9. The chain lubrication and hydraulic motor oil drain linkage control system according to claim 8, characterized in that, It also includes overflow path and safety relief valve; One end of the overflow passage is connected to the first passage and is connected between the pressure reducing valve and the lubricating oil tank; The air inlet of the safety relief valve is connected to the other end of the relief passage, and is used to allow gas to overflow from the air outlet of the safety relief valve through the relief passage when the outlet pressure of the pressure reducing valve exceeds the maximum gas pressure that the lubricating oil tank can withstand.

10. The chain lubrication and hydraulic motor oil drain linkage control system according to claim 9, characterized in that, The pressure reducing valve is not installed in the first passage. The safety relief valve is used to overflow gas through the relief passage from the outlet of the safety relief valve when the gas pressure in the lubricating oil tank exceeds the set pressure, thereby controlling the gas pressure in the lubricating oil tank to be maintained at the set pressure.

11. The chain lubrication and hydraulic motor oil drain linkage control system according to claim 1, characterized in that, A third back pressure check valve is provided in the first passage. The inlet of the third back pressure check valve is connected to the second chamber of the piston cylinder, and the outlet of the third back pressure check valve is connected to the inlet of the lubricating oil tank, so as to supply gas in the second chamber of the piston cylinder to the lubricating oil tank in one direction.

12. The chain lubrication and hydraulic motor oil drain linkage control system according to claim 1, characterized in that, A fourth one-way valve is provided in the first passage. The inlet of the fourth one-way valve is connected to the second chamber of the piston cylinder, and the outlet of the fourth one-way valve is connected to the inlet of the lubricating oil tank, so as to supply gas in the second chamber of the piston cylinder to the lubricating oil tank in one direction.

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