Air pressure push type double-line distributor and grease supply method

Abstract

The invention belongs to the technical field of double-line distributors, and particularly relates to an air pressure pushing type double-line distributor and a grease supply method. The device is mainly composed of a gas pushing device, a liquid one-way piston and a distributor with a simplified oil way. The distributor with the simplified oil way is vertically provided with a through channel for installing a gas pushing device, an air channel hole and an air valve, and a liquid check valve is installed below the distributor to prevent lubricating oil from flowing back. The distributor is transversely provided with a through channel as an oil channel, and the oil channel is provided with an oil inlet and an oil outlet. The gas pushing device pushes a piston through air pressure to inject lubricating oil. According to the high-sealing-performance double-line distributor, the problems that according to a traditional high-sealing-performance double-line distributor, due to the fact that an indicating rod communicates with an oil cavity, the sealing performance of the oil cavity is poor, and the traditional high-sealing-performance double-line distributor cannot control oil supply of all oil supply points respectively can be well solved.

Description

Technical Field

[0001] The invention relates to the technical field of double-line distributors, and in particular to a gas pressure-propelled double-line distributor and a grease supply method. Background Art

[0002] Dual-line distributors have been widely used in centralized lubrication systems of mechanical equipment. However, many dual-line distributors of lubricating oil on the market currently have problems such as complex structure, low working pressure, large error in oil supply, and cumbersome operation, which can no longer meet the use requirements of modern mechanical equipment.

[0003] In order to solve these shortcomings, the Chinese utility model patent with authorization announcement number CN202392421U provides an improved two-wire distributor. This improved design has made certain progress in some aspects, but it has also exposed some problems in actual application. In this technical solution, the indicator rod on the outside of the direct-through two-wire distributor displays the working status in real time. Since the indicator rod is directly connected to the working piston, the sealing of the oil chamber in the two-wire distributor body is poor. Even if a rubber sealing ring is set on the inner wall of the sliding hole, the rubber sealing ring is prone to aging in a long-term high temperature and high pressure use environment, thereby affecting the working performance of the two-wire distributor.

[0004] Therefore, it is necessary to design an optimized two-line distributor to develop a two-line distributor with a simpler structure, higher working pressure, more precise oil supply control, easier operation and more reliable, so as to better meet the growing use needs of modern mechanical equipment. Summary of the invention

[0005] In view of the defects existing in the above-mentioned prior art, the purpose of the present invention is to provide a pneumatically driven dual-line distributor and a grease supply method. The dual-line distributor of the present invention is an oil supply device with a pressure line and a return line, which uses air pressure to push a piston to inject lubricating oil; the present invention uses external air pressure to adjust the air pressure; by separating the control line and the oil supply line, it can be achieved that the grease does not leak and the oil supply amount is accurate; by arranging multiple channels, it can be achieved that the oil supply points are controlled separately.

[0006] The technical solution of the present invention is specifically described as follows.

[0007] A pneumatically driven two-line distributor comprises a distributor body, wherein an oil passage running horizontally through the distributor body and a control passage running vertically through the distributor body are arranged inside the distributor body, and the oil passage and the control passage intersect with each other; a gas driving device and an oil supply oil circuit are arranged in the control channel, and the gas driving device comprises a cylinder, a piston in the cylinder, a liquid one-way piston and a piston rod; the cylinder is arranged above the oil passage, and air passage holes are arranged on both sides of the cylinder, one end of the two air passage holes are respectively connected to the top end and the bottom end of the cylinder, and the other end is respectively connected to the air valve at the top end and the air valve at the bottom end of the cylinder, the oil supply oil circuit is located below the oil passage, the liquid one-way piston is arranged in the oil supply oil circuit, the piston in the cylinder and the liquid one-way piston are connected by a vertically arranged piston rod, and the liquid check valve is installed at the bottom end of the oil supply oil circuit.

[0008] In the present invention, each distributor body includes a plurality of control channels which are arranged in parallel with each other.

[0009] In the present invention, a plurality of trapezoidal one-way oil guide holes which are narrow at the top and wide at the bottom are opened inside the liquid one-way piston, the bottom of the one-way oil guide hole is sealed with a metal cross, a sphere is arranged in the one-way oil guide hole, the diameter of the sphere is larger than the top diameter of the one-way oil guide hole and the bottom radius is smaller than the bottom diameter of the one-way oil guide hole.

[0010] In the present invention, the cylinder top end air valve and the cylinder bottom end air valve are arranged on the top end of the outer shell of the distributor body.

[0011] In the present invention, sealing rings are respectively arranged at both ends of the cylinder, and a buffer support and a buffer ring are connected to the outside of the sealing ring; a limit switch is arranged close to the buffer ring, and the limit switch is used to monitor the position of the piston in the cylinder.

[0012] In the present invention, a first wear-resistant ring and a first piston sealing ring are provided at the contact point between the piston in the cylinder and the cylinder; a second wear-resistant ring and a second piston sealing ring are provided at the contact point between the liquid one-way piston and the oil supply circuit.

[0013] The present invention also provides a grease supply method, which adopts the above-mentioned air pressure-propelled double-line distributor, and the specific steps are as follows: In the initial state, a pneumatic control valve is used to realize gas inlet and outlet. The pneumatic control valve includes a cylinder top air valve and a cylinder bottom air valve. The bottom air valve of the cylinder is connected to the air inlet, and the top air valve of the cylinder is connected to the air outlet. The air pressure at the bottom of the cylinder is greater than the air pressure at the top of the cylinder. The air pressure pushes the piston in the cylinder to move upward; the ball in the liquid one-way piston presses against the hole below the one-way oil guide hole, and the lubricating oil flows into the oil supply circuit from the gap between the ball and the hole below the one-way oil guide hole until the liquid one-way piston moves out of the oil supply circuit; When filling oil once, the air valve at the top of the cylinder is connected to inlet air, and the air valve at the bottom of the cylinder is connected to outlet air. The air pressure at the bottom of the cylinder is lower than the air pressure at the top of the cylinder. The air pressure pushes the piston in the cylinder to move downward, and the piston rod pushes the liquid one-way piston below; the ball in the liquid one-way piston presses against the hole above the one-way oil guide hole, and the lubricating oil in the oil supply circuit is pumped into the liquid check valve for oil filling.

[0014] Compared with the prior art, the advantages of the present invention are: The present invention utilizes external air pressure difference to control oil supply, conveniently controls the supply air pressure value, compensates for the low working pressure problem of the old-fashioned two-line distributor, and ensures that grease can smoothly and accurately enter the equipment.

[0015] The internal structure of the present invention is mainly composed of the oil supply oil channel, the air channel hole and the internal structure of the oil channel, which is simple and easy to process.

[0016] The present invention controls the oil supply through a pneumatic control device, and the grease is completely in the oil supply oil circuit. The oil circuit is simplified by combining a liquid check valve and a liquid one-way piston, effectively ensuring that the grease fully enters the equipment to be lubricated, avoiding the problems of grease backflow and grease leakage.

[0017] The oil supply and air pressure devices in the distributor of the present invention are separated, so even if the sealing structure ages in a high temperature and high pressure environment, oil leakage will not occur. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of a gas pressure-propelled dual-line distributor of the present invention.

[0019] Figure 2 It is a structural schematic diagram of a liquid one-way piston.

[0020] Numbers in the figure: 2-air duct hole, 3-housing, 4-piston in cylinder, 5-control channel, 6-piston rod, 7-oil channel, 8-liquid one-way piston, 9-oil supply line, 10-liquid check valve, 11-top air valve of cylinder, 12-buffer support, 13-screw, 14-buffer ring, 15-first sealing ring, 16-limit switch, 17-bottom air valve of cylinder, 18-second sealing ring, 41-first wear-resistant ring, 42-first piston sealing ring, 81-second wear-resistant ring, 82-piston sealing ring, 83-assembly hole, 84-sphere, 85-one-way oil guide hole. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0022] The embodiments of the present invention are further described in detail below with reference to the accompanying drawings.

[0023] like Figure 1 to Figure 2 As shown, a pneumatically driven two-line distributor is provided, wherein an oil passage 7 and a control passage 5 intersecting with the oil passage 7 are provided inside the distributor; the oil passage 7 is a horizontally opened through passage, and an oil inlet and an oil outlet are provided at both ends of the oil passage 7 respectively; the control passage 5 is a vertically opened through passage, and a gas driving device is installed in the control passage 5, and the gas driving device comprises an air passage hole 2, a cylinder, a piston 4 in the cylinder, a liquid one-way piston 8 and a piston rod 6; a liquid check valve 10 is installed at the bottom end of the distributor to prevent insufficient lubrication caused by backflow of grease; the liquid one-way piston 8 is arranged in an oil supply oil circuit 9, and the oil supply oil circuit 9 is the oil circuit to be distributed, and the grease is in the oil supply oil circuit 9. When the piston rod 6 pushes, all the grease in the oil supply oil circuit 9 is pushed out, so as to pump the lubricating oil into the liquid check valve 10 for oil filling.

[0024] The cylinder barrel is located above the oil passage 7, and a hole is opened in the cylinder barrel corresponding to the air inlet passage; the top of the cylinder barrel is fixed in the control passage 5 by screws 13.

[0025] Airway holes 2 are arranged on the left and right sides of the control channel 5, and the airway holes 2 are connected to the control channel 5 and the outside of the top end of the double-line distributor housing 3; the airway hole 2 connected to the top end of the cylinder is provided with a cylinder top end air valve 11 at the top end of the housing 3; the airway hole 2 connected to the bottom end of the cylinder is provided with a cylinder bottom end air valve 17 at the top end of the housing 3.

[0026] The gas propulsion device consists of a piston 4 in a cylinder, a piston rod 6 and a liquid one-way piston 8 outside the cylinder. A first wear-resistant ring 41 and a first piston sealing ring 42 are provided at the contact point between the piston 4 in the cylinder and the cylinder to ensure the service life of the equipment and the air tightness of the upper and lower gas chambers; a second wear-resistant ring 81 and a second piston sealing ring 82 are provided at the contact point between the liquid one-way piston 8 and the oil supply line 9 to ensure the service life of the equipment and the isolation of the oil channel 7 and the oil supply line 9, thereby ensuring a stable oil supply.

[0027] A first sealing ring 15 and a second sealing ring 18 are arranged at both ends of the cylinder to ensure the air tightness of the cylinder. The first sealing ring 15 and the second sealing ring 18 are connected to the buffer support 12 and the buffer ring 14, and are fixed to the top and bottom ends of the cylinder respectively by screws 13; a limit switch 16 is arranged near the upper buffer ring 14 in the cylinder to monitor the position of the piston 4 in the cylinder, and correspondingly can monitor whether the liquid one-way piston 8 is actuated and whether the lubricating grease is pumped into the equipment to be lubricated.

[0028] An assembly hole 83 for connecting the piston rod 6 is provided at the center of the top of the liquid one-way piston 8 outside the cylinder barrel, and 12 trapezoidal one-way oil guide holes 85 with narrow top and wide bottom are opened inside the liquid one-way piston 8. The bottom of the one-way oil guide hole 85 is sealed with a metal cross. A ball 84 is provided inside the one-way oil guide hole 85. The diameter of the ball 84 is larger than the diameter of the top of the one-way oil guide hole 85, which can block the top to prevent grease from overflowing upward. The diameter of the ball 84 is larger than the radius of the bottom end of the one-way oil guide hole 85 to prevent the ball 84 from falling out, and smaller than the diameter of the bottom end of the one-way oil guide hole 85 to prevent the hole from being blocked so that the grease cannot flow back downward. When the hydraulic one-way piston 8 moves downward, the ball 84 blocks the one-way oil guide hole 85 upward to ensure that the lubricating grease in the oil supply oil path 9 will not move into the oil channel 7 to cause unstable oil supply. When the hydraulic one-way piston 8 moves upward, the ball 84 fits downward on the metal cross. Since the ball 84 is too small to seal the bottom end of the one-way oil guide hole 85, the lubricating grease flows down along the gap to fill the oil supply oil path 9.

[0029] In an embodiment of the present invention, a grease supply method using the above-mentioned air pressure-propelled dual-line distributor is further provided, and the specific process of the method is as follows: In the initial state, the air valve 17 at the bottom of the cylinder is connected to the air inlet, and the air valve 11 at the top of the cylinder is connected to the air outlet. The ball 84 in the liquid one-way piston 8 presses against the hole below the one-way oil guide hole 85, and the lubricating oil flows into the oil supply passage 9 from the gap between the ball 84 and the hole below the one-way oil guide hole 85 until the liquid one-way piston 8 moves out of the oil supply passage 9. When oil filling is to be carried out, the air valve 11 at the top of the cylinder is connected for air intake, and the air valve 17 at the bottom of the cylinder is connected for air discharge. The gas pushes the piston 4 in the cylinder inside the device, and the piston rod 6 is connected to push the liquid one-way piston 8 below; the ball 84 in the liquid one-way piston 8 seals the hole above the one-way oil guide hole 85, and the lubricating oil in the oil supply circuit 9 is pumped into the liquid check valve 10 for oil filling.

[0030] It should be noted that in the description of the present application, the terms "upper", "lower", 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 the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be directly connected through an intermediate medium, and it can be the internal connection of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0031] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0032] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A pneumatically driven two-line distributor, characterized in that: It includes a distributor body, which is internally provided with an oil passage running horizontally therethrough and a control passage running vertically therethrough, and the oil passage and the control passage intersect with each other; a gas propulsion device and an oil supply oil circuit are arranged in the control channel, the gas propulsion device includes a cylinder, a piston in the cylinder, a liquid one-way piston and a piston rod, the cylinder is arranged above the oil passage, air passage holes are arranged on both sides of the cylinder, one end of the two air passage holes are respectively connected to the top end and the bottom end of the cylinder, and the other end is respectively connected to the air valve at the top end and the air valve at the bottom end of the cylinder, the oil supply oil circuit is located below the oil passage, the liquid one-way piston is arranged in the oil supply oil circuit, the piston in the cylinder and the liquid one-way piston are connected by a vertically arranged piston rod, and the liquid check valve is installed at the bottom end of the oil supply oil circuit.

2. The air pressure driven two-line distributor according to claim 1, characterized in that: Each distributor body includes a plurality of control channels which are arranged in parallel with each other.

3. The air pressure driven two-line distributor according to claim 1, characterized in that: The liquid one-way piston is provided with a plurality of trapezoidal one-way oil guide holes which are narrow at the top and wide at the bottom. The bottom of the one-way oil guide hole is sealed with a metal cross. A sphere is arranged in the one-way oil guide hole. The diameter of the sphere is larger than the top diameter of the one-way oil guide hole and the bottom radius is smaller than the bottom diameter of the one-way oil guide hole.

4. The air pressure driven two-line distributor according to claim 1, characterized in that: The cylinder top end air valve and the cylinder bottom end air valve are arranged on the top end of the outer shell of the distributor body.

5. The air pressure driven two-line distributor according to claim 1, characterized in that: Sealing rings are respectively arranged at both ends of the cylinder, and a buffer support and a buffer ring are connected to the outside of the sealing ring; a limit switch is arranged close to the buffer ring, and the limit switch is used to monitor the position of the piston in the cylinder.

6. The air pressure driven two-line distributor according to claim 1, characterized in that: A first wear-resistant ring and a first piston sealing ring are provided at the contact point between the piston in the cylinder and the cylinder; a second wear-resistant ring and a second piston sealing ring are provided at the contact point between the liquid one-way piston and the oil supply passage.

7. A method for supplying grease, characterized in that: The method adopts the air pressure driven double-line distributor according to any one of claims 1 to 6, and the specific steps are as follows: In the initial state, the air valve at the bottom of the cylinder is opened to let in air, and the air valve at the top of the cylinder is opened to let out air. The air pressure at the bottom of the cylinder is greater than the air pressure at the top of the cylinder, and the air pressure pushes the piston in the cylinder to move upward; the ball in the liquid one-way piston presses against the hole below the one-way oil guide hole, and the lubricating oil flows into the oil supply passage from the gap between the ball and the hole below the one-way oil guide hole until the liquid one-way piston moves out of the oil supply passage; When filling oil once, open the air valve at the top of the cylinder to let in air, and open the air valve at the bottom of the cylinder to let out air. The air pressure at the bottom of the cylinder is lower than the air pressure at the top of the cylinder. The air pressure pushes the piston in the cylinder to move downward, and the connected piston rod pushes the liquid one-way piston below; the ball in the liquid one-way piston presses against the hole above the one-way oil guide hole, and the lubricating oil in the oil supply circuit is pumped into the liquid check valve for oil filling.

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