Chain lubricating oil system capable of discharging oil at constant pressure

Abstract

The utility model provides a chain lubricating oil system with constant-pressure oil outlet, which relates to the technical field of excavator hydraulic systems and comprises a first oil way, a piston cylinder, a first passage, a lubricating oil tank, a lubricating oil way, an air suction passage, a second backpressure one-way valve, a hydraulic control one-way valve, a control oil way and a pressure reducing valve. One end of the first oil way communicates with a first cavity of the piston cylinder. 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 provided with a chain lubricating oil outlet for discharging lubricating oil in the lubricating oil tank from the chain lubricating oil outlet through the lubricating oil circuit and flowing onto a chain to lubricate the chain; the pressure reducing valve is arranged on the first channel and used for reducing the gas pressure to the set pressure after gas flows through the pressure reducing valve in the forward direction and controlling the gas pressure in the lubricating oil tank to be maintained at the set pressure. When the hydraulic motor drives the chain to rotate, the lubricating oil tank discharges oil at constant pressure to lubricate the chain.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic system technology for excavators, and in particular to a chain lubrication system with constant pressure oil output. 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 system with constant pressure oil output 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 system with constant pressure oil output, including: 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, and a pressure reducing valve.

[0006] One end of the first oil passage is connected to the first chamber of the piston cylinder, and is used to supply hydraulic oil to the first chamber of the piston cylinder or to discharge hydraulic oil from the first chamber of the piston cylinder;

[0007] 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;

[0008] 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.

[0009] Among them, the lubricating oil can be engine oil or waste hydraulic oil, which has a low cost;

[0010] 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;

[0011] 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.

[0012] 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.

[0013] The pressure reducing valve is installed 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. It is used to reduce the gas pressure to the set pressure after the gas flows through the pressure reducing valve in the forward direction, and to control the gas pressure in the lubricating oil tank to be maintained at the set pressure.

[0014] This application maintains the sealing state of the lubricating oil tank by setting a second back pressure check valve in the air intake passage and a hydraulic control check valve in the lubrication oil line. Then, by setting a pressure reducing valve in the first passage to control the air pressure in the lubricating oil tank to be constant, the constant pressure oil discharge of the lubricating oil tank is achieved, ensuring that the lubricating 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.

[0015] Furthermore, a first one-way valve is provided on the first passage. The first one-way valve is located between the pressure reducing valve and the lubricating oil tank. The inlet of the first one-way valve is connected to the outlet of the pressure reducing valve, and the outlet of the first one-way valve is connected to the inlet of the lubricating oil tank. This is used to allow gas to flow unidirectionally from the first passage into the lubricating oil tank, thereby preventing gas and / or lubricating oil from flowing from the first passage into the second chamber of the piston cylinder.

[0016] Furthermore, the constant pressure oil-discharge chain lubrication system also includes an overflow path and a safety overflow valve;

[0017] 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;

[0018] The air inlet of the safety relief valve is connected to the other end of the relief passage. 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 passage, thereby maintaining the stable gas pressure in the lubricating oil tank and protecting the safety of the constant pressure oil-discharging chain lubrication system.

[0019] 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.

[0020] Furthermore, the constant pressure oil-discharge chain lubrication system also includes a hydraulic motor, an oil supply circuit, and an oil return circuit;

[0021] 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.

[0022] 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.

[0023] The hydraulic motor is used to drive the chain to rotate;

[0024] The other end of the first oil circuit can be selectively connected to the oil supply circuit, the drain port of the hydraulic motor, or the oil return circuit.

[0025] Furthermore, the constant pressure oil-discharge chain lubrication 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.

[0026] Furthermore, the constant pressure oil-discharge chain lubrication system also includes a return oil tank, with the other end of the return oil circuit connected to the return oil tank for hydraulic oil to flow back from the return oil circuit into the return oil tank.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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;

[0032] 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.

[0033] 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.

[0034] Furthermore, the air intake is disposed on the wall of the tube body;

[0035] 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.

[0036] Furthermore, a compression spring is provided in the second chamber of the piston cylinder, and the compression spring is sleeved on the push rod;

[0037] 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.

[0038] 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.

[0039] The inlet of the lubricating oil tank is connected to the air intake chamber;

[0040] The outlet of the lubricating oil tank is connected to the oil outlet chamber;

[0041] 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;

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] By adopting the above technical solution, this utility model has the following beneficial effects:

[0047] This utility model provides a constant pressure oil discharge chain lubrication system, which realizes constant pressure oil discharge from the lubrication tank while the hydraulic motor drives the chain to rotate. This ensures that the lubricating oil is continuously and stably discharged from the chain lubrication outlet to lubricate the chain, eliminating the need to waste hydraulic oil in the excavator's hydraulic system and greatly reducing the cost of chain lubrication. Attached Figure Description

[0048] 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.

[0049] Figure 1 A schematic diagram of a chain lubrication system with constant pressure oil output provided in an embodiment of this utility model;

[0050] Figure 2 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;

[0051] Figure 3 for Figure 2 The diagram shows a cross-sectional view of the piston cylinder when the first chamber space is compressed to its minimum.

[0052] Figure 4 This is a schematic diagram of the structure of the lubricating oil tank provided in an embodiment of the present utility model;

[0053] Figure 5 for Figure 4 The diagram shows the internal structure of the lubricating oil tank.

[0054] Figure 6 for Figure 4 The diagram shows the internal structure of the lubricating oil tank when it is tilted in a direction away from the first through hole;

[0055] Figure 7 for Figure 4 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.

[0056] Figure 8 for Figure 4 The side perspective view of the lubricating oil tank shown is tilted away from the first through hole along its width.

[0057] Figure 9 This is a schematic diagram of the internal structure of a lubricating oil tank according to another embodiment of the present invention;

[0058] Figure 10 for Figure 9 The diagram shows a perspective view of the lubricating oil tank tilted to both sides along its length.

[0059] Figure 11 for Figure 9 The diagram shows a side perspective view of the lubricating oil tank tilted to both sides along its width.

[0060] Figure label:

[0061] 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-Filter; 7-First check valve; 8-Throttle valve; 9-Hydraulic control check valve; 10-Pressure reducing valve; 11-Safety relief valve. Detailed Implementation

[0062] 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.

[0063] 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.

[0064] 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.

[0065] The present invention will be further explained below with reference to specific embodiments.

[0066] 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.

[0067] Example 1

[0068] like Figure 1 As shown, this embodiment provides a constant pressure oil-discharge chain lubrication system, including: a first oil circuit, a piston cylinder 2, a first passage, a lubricating oil tank 3, a lubricating oil circuit, an air intake passage, a second back pressure check valve 5, a hydraulically controlled check valve 9, a control oil circuit, and a pressure reducing valve 10; one end of the first oil circuit is connected to the first chamber of the piston cylinder 2, used to supply hydraulic oil to the first chamber of the piston cylinder 2 or 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, used to discharge gas from the second chamber of the piston cylinder 2 and supply gas to the lubricating oil tank 3; one end of the lubricating oil circuit is connected to the outlet of the lubricating oil tank 3, and the other end is set as a chain lubrication oil outlet, which is located above the chain, so that the lubricating oil in the lubricating oil tank 3 is discharged from the chain lubrication oil outlet through the lubricating oil circuit and flows onto the chain to lubricate the chain; wherein, the lubricating oil can be machine oil or waste hydraulic oil, which has a low cost;

[0069] 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;

[0070] The hydraulic control check valve 9 is installed on the lubricating oil circuit. The oil outlet of the hydraulic control check valve 9 is connected to the outlet of the lubricating oil tank 3, and the oil inlet of the hydraulic control check valve 9 is connected to the chain lubrication outlet. The control oil port of the hydraulic control check valve 9 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 9. 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 2), the oil outlet and the oil inlet of the hydraulic control check valve 9 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 (i.e., the hydraulic oil in the first chamber of the piston cylinder 2 is discharged from the first oil circuit) or does not flow, the lubricating oil cannot flow through the hydraulic control check valve 9.

[0071] The pressure reducing valve 10 is installed in the first passage. The inlet of the pressure reducing valve 10 is connected to the second chamber of the piston cylinder 2, and the outlet of the pressure reducing valve 10 is connected to the inlet of the lubricating oil tank 3. It is used to reduce the gas pressure to the set pressure after the gas flows through the pressure reducing valve 10 in the forward direction, and to control the gas pressure in the lubricating oil tank 3 to be maintained at the set pressure.

[0072] During chain lubrication, 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 and 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 a minimum by the piston. Since the gas discharged from the second chamber of the piston cylinder 2 cannot be discharged from the intake passage through the second back pressure check valve 5, the gas flows from the first passage through the pressure reducing valve 10 to the set pressure and then into the lubricating oil tank 3, thereby controlling the gas pressure in the lubricating oil tank 3 to maintain at the set pressure. At the same time, hydraulic oil flows from the first oil passage to the control oil passage and then to the hydraulic control check valve 9. The control port of the hydraulic check valve 9 receives a pressure signal and controls the oil outlet of the hydraulic check valve 9 to connect with the oil inlet, thus opening the hydraulic check valve 9. After the gas flows into the lubricating oil tank 3 from the first passage, the gas in the lubricating oil tank 3 increases, and the gas pressure in the lubricating oil tank 3 is 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 lubricating oil passage and flows onto the chain to lubricate the chain.

[0073] After lubricating the chain, the piston inside the piston cylinder 2 is pushed into the second chamber of the piston cylinder 2 by the piston's 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 of the first chamber of the piston cylinder 2 is compressed to the minimum by the piston; at the same time, the second chamber of the piston cylinder 2 draws in air from the intake passage, and the air flows into the second chamber of the piston cylinder 2 through the second back pressure check valve 5.

[0074] This application maintains the sealing state of the lubricating oil tank 3 by setting a second back pressure check valve 5 in the air intake passage and a hydraulic control check valve 9 in the lubrication oil line. Then, by setting a pressure reducing valve 10 in the first passage to control the air pressure in the lubricating oil tank 3 to be constant, the constant pressure oil discharge of the lubricating oil tank 3 is achieved, ensuring that the lubricating 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.

[0075] Based on the above technical solution, and further preferably, a first one-way valve 7 is provided on the first passage. The first one-way valve 7 is located between the pressure reducing valve 10 and the lubricating oil tank 3. The inlet of the first one-way valve 7 is connected to the outlet of the pressure reducing valve 10, and the outlet of the first one-way valve 7 is connected to the inlet of the lubricating oil tank 3. This 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 first one-way valve 7.

[0076] More preferably, the constant pressure oil-discharge chain lubrication system further includes an overflow path and a safety overflow valve 11; one end of the overflow path is connected to the first passage and is connected between the pressure reducing valve 10 and the lubricating oil tank 3; the air inlet of the safety overflow valve 11 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 11 through the overflow path when the outlet pressure of the pressure reducing valve 10 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 constant pressure oil-discharge chain lubrication system; if the gas pressure fails to decrease to the set pressure after the gas flows through the pressure reducing valve 10, the gas pressure is reduced to the set pressure by allowing part of the gas to overflow through the safety overflow valve 11, thereby maintaining the constant gas pressure in the lubricating oil tank 3.

[0077] Furthermore, the constant-pressure oil-discharge chain lubrication system also includes a hydraulic motor 1, 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 to supply 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 the return of hydraulic oil from the hydraulic motor 1. The hydraulic motor 1 drives the chain to rotate. The other end of the first oil circuit can be selectively connected to the oil supply circuit, the oil drain port of the hydraulic motor 1, or the oil return circuit. 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 achieving constant-pressure oil discharge from the lubrication tank 3 while the hydraulic motor 1 drives the chain to rotate. The lubricating oil is continuously and stably discharged from the chain lubrication outlet to lubricate the chain. In this embodiment, the other end of the first oil circuit is connected to the oil return circuit.

[0078] In this embodiment, the constant pressure oil supply chain lubrication 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.

[0079] Furthermore, the constant pressure oil-discharge chain lubrication system also includes a return oil tank, with the other end of the return oil circuit connected to the return oil tank for hydraulic oil to flow back from the return oil circuit into the return oil tank.

[0080] 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.

[0081] In this embodiment, a filter 6 is also provided on the air intake passage. The filter 6 is located on the inlet side of the second back pressure check valve 5 and is used to filter impurities in the air.

[0082] More preferably, a throttle valve 8 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.

[0083] 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.

[0084] This invention enables the lubricating oil tank 3 to discharge oil at constant pressure while the hydraulic motor 1 drives the chain to rotate, ensuring that the lubricating oil is continuously and stably discharged from the chain lubrication outlet to lubricate the chain. This eliminates the need to waste hydraulic oil in the excavator's hydraulic system and greatly reduces the cost of chain lubrication.

[0085] Example 2

[0086] This embodiment is basically the same as embodiment 1, except that:

[0087] This embodiment provides a chain lubrication system with constant pressure oil output. The pressure reducing valve 10 is not installed on the first passage. The safety overflow valve 11 is used to control the gas pressure in the lubricating oil tank 3 to be maintained at the set pressure when the gas pressure in the lubricating oil tank 3 exceeds the set pressure.

[0088] Example 3

[0089] This embodiment is basically the same as embodiment 1, except that:

[0090] like Figure 2-3 As shown in the figure, this embodiment provides a chain lubrication system with constant pressure oil output. 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.

[0091] 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.

[0092] 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.

[0093] 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 6 is installed at the inlet of the second back pressure check valve 5.

[0094] 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.

[0095] Example 4

[0096] This embodiment is basically the same as embodiment 1, except that:

[0097] like Figure 4-8 As shown ( Figure 6-8 (The red dashed line in the middle represents the lubricating oil level). This embodiment provides a constant pressure oil outlet chain lubrication 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.

[0098] 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.

[0099] 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.

[0100] More preferably, the outlet 302 of the lubricating oil tank 3 is located at the bottom center of the lubricating oil tank 3.

[0101] 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.

[0102] Example 5

[0103] This embodiment is basically the same as embodiment 4, except that:

[0104] like Figure 9-11 As shown ( Figure 10-11 (The red dashed line in the middle represents the lubricating oil level). This embodiment provides a chain lubrication system with constant pressure oil output. 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.

[0105] 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.

[0106] 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.

[0107] 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.

[0108] 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 system with constant pressure oil output, characterized in that, include: 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 and pressure reducing valve; One end of the first oil passage is connected to the first chamber of the piston cylinder, and is used to supply hydraulic oil to the first chamber of the piston cylinder or to discharge 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. The pressure reducing valve is installed 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. It is used to reduce the gas pressure to the set pressure after the gas flows through the pressure reducing valve in the forward direction, and to control the gas pressure in the lubricating oil tank to be maintained at the set pressure.

2. The chain lubrication system with constant pressure oil output according to claim 1, characterized in that, A first one-way valve is provided on the first passage. The first one-way valve is located between the pressure reducing valve and the lubricating oil tank. The inlet of the first one-way valve is connected to the outlet of the pressure reducing valve, and the outlet of the first 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.

3. The chain lubrication system with constant pressure oil output according to claim 2, 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.

4. The chain lubrication system with constant pressure oil output according to claim 3, 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.

5. The chain lubrication system with constant pressure oil output according to claim 1, characterized in that, It also includes a hydraulic motor, oil supply circuit, and oil return circuit; 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. 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. The hydraulic motor is used to drive the chain to rotate; The other end of the first oil circuit is connected to the oil supply circuit, the drain port of the hydraulic motor, or the oil return circuit.

6. The chain lubrication system with constant pressure oil output according to claim 5, characterized in that, A first back pressure check valve is installed on the return oil line to allow hydraulic oil to flow unidirectionally from the return oil line to the return oil tank.

7. The chain lubrication system with constant pressure oil output according to claim 1, characterized in that, 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.

8. The chain lubrication system with constant pressure oil output according to claim 1, characterized in that, A throttle valve is installed in the lubrication oil circuit to regulate the flow rate of the lubrication oil.

9. The chain lubrication system with constant pressure oil output according to claim 1, characterized in that, The second chamber of the piston cylinder has 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. 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.

10. The chain lubrication system with constant pressure oil output according to claim 9, characterized in that, The piston cylinder has an air intake port on its cylinder wall, which is connected to the second chamber of the piston cylinder. One end of the air intake passage is connected to the air intake port.

11. The chain lubrication system with constant pressure oil output according to claim 10, characterized in that, The air intake is located on the wall of the tube.

12. The chain lubrication system with constant pressure oil output according to claim 9, characterized in that, A compression spring is provided in the second chamber of the piston cylinder, and the compression spring is sleeved on the push rod; 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.

13. The chain lubrication system with constant pressure oil output according to claim 1, characterized in that, The lubricating oil tank is provided with a first partition, which divides the lubricating oil tank into an air inlet chamber and an oil outlet chamber from top to bottom. The inlet of the lubricating oil tank is connected to the air intake chamber; The outlet of the lubricating oil tank is connected to the oil outlet chamber; The first partition has a first through hole at its first corner. The air inlet chamber and the oil outlet chamber are connected through the first through hole, so that the lubricating oil and gas in the lubricating oil tank can flow between the air inlet chamber and the oil outlet chamber.

14. The chain lubrication system with constant pressure oil output according to claim 13, characterized in that, The lubricating oil tank is also provided with a second partition, which is located below the first partition. 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. 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.

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