Overflow replenishing valve assembly and mechanical equipment for power head motors

Abstract

This application belongs to the field of hydraulic valve assemblies, and particularly relates to an overflow replenishing valve assembly and mechanical device for a power head motor. One end of the first and second main oil passages of the overflow replenishing valve assembly is connected to the inlet and outlet of the power head motor, respectively. The other end of the first and second main oil passages is used to connect to the oil supply system. The first return port is connected to the main return oil circuit of the oil supply system, and the second return port is connected to a drain port on the power head motor. The first and second overflow valves limit the maximum pressure of the overflow replenishing valve assembly and the power head motor. The first and second check valves replenish oil when negative pressure occurs at the oil port of the power head motor. The third check valve directs oil to the low-pressure side of the inlet and outlet of the power head motor when the drain pressure of the motor housing exceeds the preset pressure, ensuring that the pressure of the motor housing does not exceed the preset pressure. The third check valve also provides nearby oil replenishment to the low-pressure side of the inlet and outlet of the power head motor, preventing cavitation.

Description

Technical Field

[0001] This application relates to the field of hydraulic valve assembly technology, and in particular to an overflow replenishing valve assembly and mechanical device for a power head motor. Background Technology

[0002] Rotary drilling rigs are engineering machines primarily used for drilling in soil and rock, widely applied in underground engineering, infrastructure construction, and mining. Existing rotary drilling rig power heads mainly drive the drill rod for drilling operations and for dumping soil from the drill bucket. When encountering clay, the rotary drilling rig utilizes the high-speed, frequent forward and reverse inertial impact of the power head motor to dump soil. Under these rapid and frequent inertial impacts, if the system's oil replenishment is not timely or insufficient, the power head motor will experience air intake cavitation, leading to motor damage or reduced lifespan. The power head motor is driven by high-pressure hydraulic fluid supplied by the hydraulic system. Existing functional oil replenishment valves are connected to the power head motor via pipelines, and these pipelines are relatively long, making it difficult to replenish oil in a timely manner when needed. Furthermore, the excessively high return oil pressure of the power head motor results in high oil discharge pressure in the motor housing. Air intake significantly reduces the motor's lifespan, and pressure buildup in the housing can damage the oil seals or cause oil leaks, affecting the motor's reliability.

[0003] In related technologies, such as the utility model patent with announcement number CN216895123U, a special valve group for motor overload oil replenishment is disclosed. It can effectively and promptly relieve pressure, thereby protecting the motor's safety. The oil replenishment valve also replenishes oil in a timely manner through self-priming when the motor rotates, preventing the motor from sucking in cavitation. However, it cannot achieve local pressure relief and local oil replenishment. The utility model with announcement number CN204851828U discloses a rotary buffer oil replenishment device for rotary drilling rigs. Although it has a left overflow valve and a right overflow valve connected between two main oil passages, a hydraulically controlled check valve is connected in series on each of the left and right overflow valves. The opening and closing status of the two hydraulically controlled check valves controls whether the overflow valve can function. When there is no high-pressure oil in either oil circuit A or B, the right hydraulic check valve 4 and the left hydraulic check valve 6 are in the open state. The right relief valve 5 or the left relief valve 7 can act as a buffer when the system is under high pressure. When there is high-pressure oil in either oil circuit A or B, the inlet pressure of the hydraulic check valve 4 and the hydraulic check valve 6 is lower than the hydraulic control port pressure, so they are in the closed-open state, and the relief valve does not function in this state. It acts as a buffer during emergency stop of the slewing motion, protecting the slewing motor. However, it still cannot achieve nearby pressure relief and nearby oil replenishment.

[0004] In summary, how to provide an overflow oil replenishment valve assembly that can replenish oil in a timely manner when the power head motor needs replenishment and reduce the oil leakage pressure of the housing when draining oil, as well as a mechanical device including this overflow oil replenishment valve assembly, has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] This application provides an overflow replenishing valve assembly and mechanical device for a power head motor, which aims to achieve local pressure relief and local oil replenishment of the power head motor, better protect the skeleton oil seal, extend its service life, effectively reduce costs, and improve the efficiency of the hydraulic system.

[0006] Therefore, according to one aspect of this application, an overflow valve assembly for a power head motor is provided, comprising a valve block and a first overflow valve, a second overflow valve, a first check valve, a second check valve, and a third check valve mounted on the valve block. The valve block is provided with a first main oil passage and a second main oil passage penetrating the valve block, and a first channel, a second channel, and a third channel located inside the valve block and connecting the first main oil passage and the second main oil passage. One end of the first main oil passage and one end of the second main oil passage are respectively connected to the oil inlet and outlet of the power head motor, and the other ends of the first main oil passage and the second main oil passage are connected to an oil supply system. The first overflow valve is located on the first channel, and the flow direction of the first overflow valve is from the first main oil passage to the second main oil passage. The second overflow valve is located on the first channel. The flow direction of the second overflow valve is from the second main oil passage to the first main oil passage. The first check valve and the second check valve are both located on the third passage. The oil outlet of the first check valve is connected to the first main oil passage, and the oil outlet of the second check valve is connected to the second main oil passage. The valve block is also provided with a return oil passage that runs through the valve block. The return oil passage is connected to the third passage between the first check valve and the second check valve. The two ends of the return oil passage on the valve block form a first return oil port and a second return oil port, respectively. The third check valve is located on the return oil passage between the second return oil port and the third passage, and the oil inlet of the third check valve is connected to the second return oil port. The first return oil port is used to connect to the main return oil circuit of the oil supply system, and the second return oil port is used to connect to a drain port on the power head motor.

[0007] Optionally, the opening pressure of the first check valve and the second check valve does not exceed 0.5 bar, the opening pressure of the third check valve does not exceed 0.7 bar, and the opening pressure of the first check valve and the second check valve is less than the opening pressure of the third check valve.

[0008] Optionally, the opening pressure of both the first relief valve and the second relief valve is less than 400 bar.

[0009] Optionally, the overflow replenishing valve assembly further includes a first pressure testing connector, a second pressure testing connector, and a third pressure testing connector. The valve block is also provided with a first pressure testing interface, a second pressure testing interface, and a third pressure testing interface. The first pressure testing interface is connected to the first main oil passage, and the first pressure testing connector is installed on the first pressure testing interface. The second pressure testing interface is connected to the second main oil passage, and the second pressure testing connector is installed on the second pressure testing interface. The third pressure testing interface is connected to the third channel between the first check valve and the second check valve, and the third pressure testing connector is installed on the third pressure testing interface.

[0010] Optionally, the valve block is rectangular, the first main oil passage and the second main oil passage are parallel to each other and both pass through the front of the valve block to the back of the valve block, and the valve block is provided with mounting through holes around the first main oil passage and the second main oil passage.

[0011] Optionally, the first oil return port is located on the front of the valve block, and the second oil return port is located on the top of the valve block.

[0012] Optionally, the first overflow valve and the first check valve are both inserted into the bottom of the valve block, the second overflow valve and the second check valve are both inserted into the top of the valve block, and the third check valve is inserted into the side of the valve block.

[0013] According to another aspect of this application, a mechanical device is provided, including a power head motor and an overflow replenishing valve assembly as described above, wherein the overflow replenishing valve assembly is installed on the inlet and outlet ports of the power head motor, and the second return port is connected to an oil drain port on the power head motor.

[0014] The beneficial effects of the overflow replenishing valve assembly and mechanical device for a power head motor provided in this application are as follows: Compared with the prior art, in specific use, one end of the first main oil passage and one end of the second main oil passage are respectively connected to the oil inlet and outlet of the power head motor. The other ends of the first and second main oil passages are used to connect to the oil supply system. The first return port is connected to the main return oil circuit of the oil supply system, and the second return port is connected to a drain port on the power head motor. The first and second overflow valves limit the maximum pressure of the overflow replenishing valve assembly and the power head motor. The first and second check valves replenish oil when negative pressure occurs at the oil port of the power head motor. The third check valve can guide the oil to the low-pressure side of the inlet and outlet of the power head motor when the drain pressure of the motor housing exceeds the preset pressure, thereby limiting the pressure of the motor housing from exceeding the preset pressure. In addition, the third check valve can also replenish oil to the low-pressure side of the inlet and outlet of the power head motor nearby, which is beneficial to prevent cavitation. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] in:

[0017] Figure 1 This is a schematic diagram of the structure of the overflow replenishing valve assembly for the power head motor and the power head motor assembly shown in one embodiment of this application;

[0018] Figure 2 yes Figure 1 A schematic diagram of the overflow replenishment valve assembly and the power head motor assembly from another perspective;

[0019] Figure 3 This is a front view of an overflow replenishing valve assembly for a power head motor, as shown in one embodiment of this application.

[0020] Figure 4 This is a schematic diagram of the rear structure of an overflow replenishing valve assembly for a power head motor, as shown in one embodiment of this application.

[0021] Figure 5 This is a schematic diagram of an overflow replenishing valve assembly for a power head motor, as shown in one embodiment of this application.

[0022] Explanation of key component symbols:

[0023] 100. Power head motor;

[0024] 200. Overflow replenishing valve assembly;

[0025] 10. Valve block; 11. First main oil passage; 12. Second main oil passage; 13. First return port; 14. Second return port; 15. Mounting through hole; 16. Sealing ring;

[0026] 21. First relief valve; 22. Second relief valve;

[0027] 31. First check valve; 32. Second check valve; 33. Third check valve;

[0028] 41. First pressure test connector; 42. Second pressure test connector; 43. Third pressure test connector. Detailed Implementation

[0029] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. Preferred embodiments of this application are shown in the drawings. However, this application can be implemented in many other different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of this application.

[0030] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0031] It should be understood that the terms "length", "width", "positive", "negative", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application 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. Therefore, they should not be construed as limitations on this application.

[0032] Furthermore, terms such as "first," "second," and similar descriptions are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with terms such as "first," "second," or similar descriptions may explicitly or implicitly include one or more of that feature.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0034] It should also be noted that in the embodiments of this application, the same reference numerals are used to represent the same component or part. For the same part in the embodiments of this application, the reference numerals may only be used to mark one part or component as an example. It should be understood that the reference numerals are also applicable to other identical parts or components.

[0035] To address the issues of oil leakage and pressure buildup in the power head motor housing and low-pressure side suction at the main oil port, embodiments of this application provide an overflow replenishing valve assembly for the power head motor, such as... Figures 1-5 As shown, the overflow replenishment valve assembly 200 includes a valve block 10 and a first overflow valve 21, a second overflow valve 22, a first check valve 31, a second check valve 32 and a third check valve 33 mounted on the valve block 10.

[0036] The valve block 10 is provided with a first main oil passage 11 and a second main oil passage 12 that penetrate the valve block 10, and a first channel, a second channel, and a third channel located inside the valve block 10 and connecting the first main oil passage 11 and the second main oil passage 12. One end of the first main oil passage 11 (i.e. Figure 5 A1 port in the middle) and one end of the second main oil passage 12 (i.e. Figure 5 Port B1 in the diagram is used to connect the oil inlet and outlet of the power head motor 100, respectively, and the other end of the first main oil passage 11 (i.e., Figure 5 (A port in the middle) and the other end of the second main oil passage 12 (i.e. Figure 5 Port B in the diagram is used to connect to the oil supply system. The first overflow valve 21 is located on the first channel, and its flow direction is from the first main oil passage 11 to the second main oil passage 12. The second overflow valve 22 is located on the second channel, and its flow direction is from the second main oil passage 12 to the first main oil passage 11. The first check valve 31 and the second check valve 32 are both located on the third channel. The outlet of the first check valve 31 is connected to the first main oil passage 11, and the outlet of the second check valve 32 is connected to the second main oil passage 12. The valve block 10 also has… A return oil passage is provided through the valve block 10. The return oil passage is connected to the third passage between the first check valve 31 and the second check valve 32. The two ends of the return oil passage on the valve block 10 form a first return oil port 13 and a second return oil port 14, respectively. The third check valve 33 is located on the return oil passage between the second return oil port 14 and the third passage, and the oil inlet of the third check valve 33 is connected to the second return oil port 14. The first return oil port 13 is used to connect to the main return oil circuit of the oil supply system, and the second return oil port 14 is used to connect to an oil drain port on the power head motor 100.

[0037] In specific use, the overflow replenishing valve assembly 200 is used at one end of the first main oil passage 11 (i.e. Figure 5 A1 port in the middle) and one end of the second main oil passage 12 (i.e. Figure 5 Port B1 in the first main oil passage 11 is connected to the oil inlet and outlet of the power head motor 100, respectively. Figure 5 (A port in the middle) and the other end of the second main oil passage 12 (i.e. Figure 5Port B in the diagram is used to connect to the reversing valve in the oil supply system. The first return port 13 is connected to the main return oil circuit of the oil supply system, and the second return port 14 is connected to a drain port on the power head motor 100. The first relief valve 21 and the second relief valve 22 limit the maximum pressure of the relief replenishment valve group 200 and the power head motor 100. The high-pressure oil in the first main oil passage 11 can be released to the second main oil passage 12 through the first relief valve 21 on the first channel. Similarly, the high-pressure oil in the second main oil passage 12 can be released to the first main oil passage 11 through the second relief valve 22 on the second channel. The first check valve 31 and the second check valve 32 replenish oil when negative pressure appears at the oil port of the power head motor 100. The third check valve 33 can guide oil to the low-pressure side of the inlet and outlet of the power head motor 100 when the oil discharge pressure of the motor housing exceeds the preset pressure, thereby limiting the pressure of the motor housing from exceeding the preset pressure. In addition, the third check valve 33 can also replenish oil to the low-pressure side of the inlet and outlet of the power head motor 100, which helps to prevent cavitation.

[0038] During operation, this overflow replenishing valve assembly 200 can relieve pressure and replenish oil nearby, reducing the length of the drain line and the back pressure of the replenishing line. Therefore, it can better protect the skeleton oil seal, extend its service life, and effectively reduce costs and improve the efficiency of the hydraulic system.

[0039] In one embodiment, such as Figure 5 As shown, the opening pressure of the first check valve 31 and the second check valve 32 both do not exceed 0.5 bar, and the opening pressure of the third check valve 33 does not exceed 0.7 bar. Furthermore, the opening pressures of the first check valve 31 and the second check valve 32 are both less than the opening pressure of the third check valve 33. The opening pressures of the first relief valve 21 and the second relief valve 22 are both less than 400 bar.

[0040] In one implementation, taking the opening pressure of the first check valve 31 and the second check valve 32 as 0.5 bar and the opening pressure of the third check valve 33 as 0.7 bar as an example, the first check valve 31 and the second check valve 32 with an opening pressure of 0.5 bar replenish oil when negative pressure occurs at the motor oil port. The third check valve 33 with an opening pressure of 0.7 bar has two functions: when the oil discharge pressure of the motor housing exceeds 0.7 bar, it guides the housing oil discharge to the low-pressure side of the motor inlet and outlet, thus limiting the housing pressure from exceeding 0.7 bar; the second function of the third check valve 33 is to replenish oil to the low-pressure side of the motor oil port nearby, which is very beneficial for preventing cavitation.

[0041] In one embodiment, such as Figures 3-5As shown, the overflow replenishing valve assembly 200 also includes a first pressure testing connector 41, a second pressure testing connector 42, and a third pressure testing connector 43. The valve block 10 is also provided with a first pressure testing interface, a second pressure testing interface, and a third pressure testing interface. The first pressure testing interface is connected to the first main oil passage 11. The first pressure testing connector 41 is installed on the first pressure testing interface. The second pressure testing interface is connected to the second main oil passage 12. The second pressure testing connector 42 is installed on the second pressure testing interface. The third pressure testing interface is connected to the third channel between the first check valve 31 and the second check valve 32. The third pressure testing connector 43 is installed on the third pressure testing interface.

[0042] The pressure gauge can be used to measure the oil pressure in the first main oil passage 11 via the first pressure measuring interface, the pressure gauge can be used to measure the oil pressure in the second main oil passage 12 via the second pressure measuring interface, and the pressure gauge can be used to measure the oil pressure in the return oil passage via the third pressure measuring interface.

[0043] Specifically, the first pressure measuring interface, the second pressure measuring interface, and the third pressure measuring interface are located on the top and two sides of the rectangular valve block 10, respectively.

[0044] In one embodiment, such as Figures 1-4 As shown, the valve block 10 is rectangular. The first main oil passage 11 and the second main oil passage 12 are parallel to each other and both pass through the front of the valve block 10 to the back of the valve block 10. The valve block 10 is provided with mounting through holes 15 that pass through the valve block 10, surrounding the first main oil passage 11 and the second main oil passage 12.

[0045] Therefore, the valve block 10 has a regular shape, which facilitates processing, manufacturing, and external installation. The function of the mounting through hole 15 is to realize the installation and fixation between the valve block 10 and the power head motor 100 and the reversing valve of the oil supply system.

[0046] To improve the sealing performance of the connection between the valve block 10 and the power head motor 100, a sealing ring 16 is provided around the back of the valve block 10, surrounding both the first main oil passage 11 and the second main oil passage 12.

[0047] Furthermore, the first oil return port 13 is located on the front of the valve block 10, and the second oil return port 14 is located on the top of the valve block 10.

[0048] Preferably, the first overflow valve 21 and the first check valve 31 are both inserted into the bottom of the valve block 10, the second overflow valve 22 and the second check valve 32 are both inserted into the top of the valve block 10, and the third check valve 33 is inserted into the side of the valve block 10. This arrangement ensures that both the front and back of the valve block 10 are flat surfaces without protruding structures, facilitating external fitting and installation. It is understood that in other embodiments, the arrangement of the first overflow valve 21, the first check valve 31, the second overflow valve 22, the second check valve 32, and the third check valve 33 can be adjusted as needed and is not limited to the above arrangement.

[0049] In addition, embodiments of this application also provide a mechanical device, including a power head motor 100 and an overflow replenishing valve assembly 200 as described in any of the above embodiments. The overflow replenishing valve assembly 200 is installed on the inlet and outlet ports of the power head motor 100, and the second return port 14 is connected to an oil drain port on the power head motor 100.

[0050] In traditional hydraulic systems, the power head motor 100 has only one drain port, which is directly connected to the oil tank, while the other drain port is usually sealed with a screw plug. In this embodiment, this sealed drain port is opened and connected to the second return port 14 on the valve block 10.

[0051] It is understood that the mechanical equipment in the embodiments of this application includes, but is not limited to, rotary drilling rigs, milling machines, crushers and other rotating equipment or tools.

[0052] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0053] The above embodiments are merely illustrative of several implementation methods of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. An overflow replenishing valve assembly for a power head motor, characterized in that, The system includes a valve block and a first relief valve, a second relief valve, a first check valve, a second check valve, and a third check valve mounted on the valve block. The valve block has a first main oil passage and a second main oil passage penetrating the valve block, and a first channel, a second channel, and a third channel located inside the valve block and connecting the first main oil passage and the second main oil passage. One end of the first main oil passage and one end of the second main oil passage are respectively connected to the oil inlet and outlet of the power head motor. The other ends of the first main oil passage and the second main oil passage are connected to the oil supply system. The first relief valve is located on the first channel, and the flow direction of the first relief valve is from the first main oil passage to the second main oil passage. The second relief valve is located on the second channel, and the flow direction of the second relief valve is... From the second main oil passage to the first main oil passage, both the first check valve and the second check valve are located on the third channel. The oil outlet of the first check valve is connected to the first main oil passage, and the oil outlet of the second check valve is connected to the second main oil passage. The valve block is also provided with a return oil passage that runs through the valve block. The return oil passage is connected to the third channel between the first check valve and the second check valve. The two ends of the return oil passage on the valve block form a first return oil port and a second return oil port, respectively. The third check valve is located on the return oil passage between the second return oil port and the third channel, and the oil inlet of the third check valve is connected to the second return oil port. The first return oil port is used to connect to the main return oil circuit of the oil supply system, and the second return oil port is used to connect to a drain port on the power head motor.

2. The overflow replenishing valve assembly according to claim 1, characterized in that, The opening pressure of the first check valve and the second check valve does not exceed 0.5 bar, the opening pressure of the third check valve does not exceed 0.7 bar, and the opening pressure of the first check valve and the second check valve is less than the opening pressure of the third check valve.

3. The overflow replenishing valve assembly according to claim 1, characterized in that, The opening pressure of both the first relief valve and the second relief valve is less than 400 bar.

4. The overflow replenishing valve assembly according to claim 1, characterized in that, The overflow replenishing valve assembly further includes a first pressure testing connector, a second pressure testing connector, and a third pressure testing connector. The valve block is also provided with a first pressure testing interface, a second pressure testing interface, and a third pressure testing interface. The first pressure testing interface is connected to the first main oil passage, and the first pressure testing connector is installed on the first pressure testing interface. The second pressure testing interface is connected to the second main oil passage, and the second pressure testing connector is installed on the second pressure testing interface. The third pressure testing interface is connected to the third channel between the first check valve and the second check valve, and the third pressure testing connector is installed on the third pressure testing interface.

5. The overflow replenishing valve assembly according to any one of claims 1-4, characterized in that, The valve block is rectangular. The first main oil passage and the second main oil passage are parallel to each other and both pass through the front and back of the valve block. The valve block is provided with mounting through holes around the first main oil passage and the second main oil passage.

6. The overflow replenishing valve assembly according to claim 5, characterized in that, The first oil return port is located on the front of the valve block, and the second oil return port is located on the top of the valve block.

7. The overflow replenishing valve assembly according to claim 5, characterized in that, The first overflow valve and the first check valve are both inserted into the bottom of the valve block, the second overflow valve and the second check valve are both inserted into the top of the valve block, and the third check valve is inserted into the side of the valve block.

8. A mechanical device, characterized in that, It includes a power head motor and an overflow replenishing valve assembly as described in any one of claims 1-7, wherein the overflow replenishing valve assembly is installed on the inlet and outlet ports of the power head motor, and the second return port is connected to an oil drain port on the power head motor.

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