Lubricating oil injection system and mining dump truck with same

Abstract

The utility model relates to the field of lubricating systems, in particular to a lubricating oil injection system and a mining dump truck with the same. The lubricating oil injection system is provided with an oil inlet way, an oil outlet way, a first oil injection way, a second oil injection way, a reversing valve and an oil injection distribution valve. The reversing valve is arranged between the oil inlet way and the oil outlet way and between the first oil injection way and the second oil injection way, the ends, away from the reversing valve, of the first oil injection way and the second oil injection way are communicated with different oil inlets of the oil injection distribution valve, and the oil injection distribution valve leads to a lubricating point through the oil injection distribution port. The reversing valve can switch the communication relation between the oil inlet oil way and the first oil injection oil way and the communication relation between the oil outlet oil way and the second oil injection oil way, so that lubricating grease can enter the oil injection distribution valve through different oil injection oil ways. According to the lubricating oil injection system, two-way oil injection can be achieved through matching of the reversing valve and the oil injection distribution valve, so that normal operation can be achieved under the condition of low-temperature pipe resistance, and the reliability of the lubricating oil injection system is guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of lubrication systems, in particular to a lubrication oil injection system and a mining dump truck having the same. Background Art

[0002] Mining dump trucks are specially used for traveling back and forth within the mining area to transport ore. Mining trucks travel on harsh road conditions and work in harsh environments for a long time. Many mechanical connections are severely worn, which can easily cause the linkage failure of many mechanical parts of electric drive mining dump trucks, causing a series of problems, resulting in the electric drive mining dump trucks not being able to operate normally.

[0003] Mining dump trucks are currently usually lubricated using a single-line lubrication system. However, mining dump trucks are large equipment that require many lubrication points and longer lubrication system pipelines. The longer pipelines of the single-line lubrication system are prone to increased pipe resistance in low temperature environments, resulting in the main pipeline's pressurization and depressurization cycle being unable to complete the closed loop, and the lubrication system cannot operate normally. Utility Model Content

[0004] In view of this, the present invention provides a lubricating oil injection system and a mining dump truck having the same, thereby solving or at least alleviating one or more of the above-mentioned problems and other problems existing in the prior art.

[0005] In order to achieve the aforementioned objectives, a first aspect of the present invention provides a lubricating oil injection system, which comprises an oil inlet oil circuit, an oil outlet oil circuit, a first oil injection oil circuit, a second oil injection oil circuit, a reversing valve, and an oil injection distribution valve;

[0006] The reversing valve is arranged between the oil inlet circuit and the oil outlet circuit and the first oil filling circuit and the second oil filling circuit. The first oil filling circuit and the second oil filling circuit are connected to different oil inlets of the oil filling distribution valve at one end away from the reversing valve. The oil filling distribution valve is connected to the lubrication point through the oil filling distribution port. The reversing valve can switch the connection relationship between the oil inlet circuit and the oil outlet circuit and the first oil filling circuit and the second oil filling circuit, so that lubricating grease can enter the oil filling distribution valve through different oil filling circuits.

[0007] In the lubricating oil injection system as described above, optionally, the lubricating grease oil injection distribution valve is provided with a control space, an oil injection space, a first oil injection pipeline and a second oil injection pipeline.

[0008] The first oil injection pipeline and the second oil injection pipeline are connected to the oil injection distribution port, and the first oil injection oil circuit, the second oil injection oil circuit, the first oil injection pipeline, the second oil injection pipeline and the oil injection space are all connected to the control space. The control space can control the connection status of the first oil injection oil circuit and the second oil injection oil circuit with the oil injection space, and the connection status of the oil injection space with the first oil injection pipeline or the second oil injection pipeline, so that the oil injection space is filled with oil into the first oil injection pipeline or the second oil injection pipeline.

[0009] In the lubricating oil injection system as described above, optionally, an oil injection plunger is provided in the oil injection space, and the oil injection plunger divides the oil injection space into a first oil injection chamber and a second oil injection chamber;

[0010] A control plunger is provided in the control space. When the lubricating grease enters the oil filling distribution valve through different oil filling lines, the control plunger can move in different directions in the control space, so that the lubricating grease enters the first oil filling chamber or the second oil filling chamber, and flows to the first oil filling pipeline or the second oil filling pipeline through the second oil filling chamber or the first oil filling chamber.

[0011] In the lubricating oil injection system as described above, optionally, the control space has a first side and a second side,

[0012] The first side of the control space is provided with a first interface, a second interface, a third interface, and a fourth interface in sequence. The first interface and the fourth interface are connected to the first oil injection circuit and the second oil injection circuit respectively. The second interface and the third interface are connected to the first oil injection pipeline and the second oil injection pipeline respectively.

[0013] The second side of the control space is provided with a fifth interface and a sixth interface in sequence. The fifth interface is relatively arranged between the first interface and the second interface, and the fifth interface is connected to the second oil filling chamber; the sixth interface is relatively arranged between the third interface and the fourth interface, and the sixth interface is connected to the first oil filling chamber. Through the movement of the control plunger, the connection and blocking of different interfaces can be achieved.

[0014] In the aforementioned lubricating oil injection system, optionally, the control plunger is provided with a first plug head, a second plug head, and a third plug head in sequence, the first plug head and the second plug head are connected via a first plug rod, and the second plug head and the third plug head are connected via a second plug rod;

[0015] The first plug can block the first interface and open the fifth interface, the second plug is located between the second interface and the third interface to isolate the second interface and the third interface, and the third plug can block the fourth interface and open the sixth interface.

[0016] In the lubricating oil filling system as described above, optionally, the oil filling plunger has an oil filling plunger head, an oil filling plunger rod and a metering part, the oil filling plunger head and the oil filling plunger rod are connected, the oil filling plunger head divides the oil filling space into the first oil filling chamber and the second oil filling chamber, the metering part is arranged at one end of the oil filling space, and the oil filling plunger rod extends into the metering part and can move relative to the metering part.

[0017] In the lubricating oil injection system as described above, optionally, the oil injection plunger rod is provided with a limiting portion near the oil injection plunger head, the outer diameter of the limiting portion is smaller than the oil injection plunger head and larger than the oil injection plunger rod, and the limiting portion and the oil injection plunger head form a gap to accommodate lubricating grease.

[0018] In the lubricating oil injection system as described above, optionally, a metering bolt is provided at the end of the metering portion, which can abut against the end of the oil injection plunger rod away from the oil injection plunger head, and the depth of the metering bolt screwed into the metering portion is adjustable.

[0019] In the lubricating oil injection system as described above, optionally, the oil inlet circuit is provided with an oil inlet and a plunger pump arranged near the oil inlet, and the plunger pump is driven by a motor to introduce lubricating grease into the oil inlet circuit from the oil inlet.

[0020] In order to achieve the aforementioned objectives, the second aspect of the present invention provides a mining dump truck, which includes the lubricating oil injection system as described in the first aspect above, and the oil inlet and oil outlet of the lubricating oil injection system are respectively connected to grease containers.

[0021] The lubricating oil injection system of the utility model can switch the communication state between the oil inlet and oil outlet passages and the first and second oil injection passages through the cooperation of the reversing valve and the oil injection distribution valve, so that lubricating grease can be injected into the oil injection distribution valve through the first or second oil injection passage. The cooperation of the reversing valve and the oil injection distribution valve can realize bidirectional oil injection. The oil injection distribution valve realizes alternating bidirectional oil injection through the sliding of the plunger therein. The sliding of the plunger requires little power and can be driven by a small thrust of lubricating grease. Therefore, it can operate normally even under low-temperature pipe resistance, thereby ensuring the reliability of the lubricating oil injection system.

[0022] The utility model also provides a mining dump truck, which has various features of the aforementioned lubricating oil injection system and thus also has corresponding advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The disclosure of the present invention will become more apparent with reference to the accompanying drawings. It should be understood that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0024] Figure 1 This is a schematic diagram of the principle of an embodiment of the lubrication oil injection system of the present utility model.

[0025] Figure 2 for Figure 1 Schematic diagram of an embodiment of a lubrication oiling system connected with a grease container.

[0026] Figure 3 This is a cross-sectional schematic diagram of an oil injection distribution valve of an embodiment of a lubricating oil injection system of the present utility model.

[0027] Figure 4 for Figure 3 A partial enlarged view of the oil injection distribution valve of an embodiment of the lubricating oil injection system is shown, showing the oil injection space.

[0028] Figure 5 for Figure 3 A partial enlarged view of the oil injection distribution valve of an embodiment of the lubricating oil injection system is shown, showing the control space.

[0029] Figure 6 for Figure 3 FIG. 1 is a diagram showing the working principle of the oil filling distribution valve of an embodiment of a lubricating oil filling system, wherein the control plunger and the oil filling plunger are in the second end position.

[0030] Figure 7 for Figure 3 FIG. 1 is a diagram showing the working principle of the oil injection distribution valve of an embodiment of a lubricating oil injection system, wherein the control plunger and the oil injection plunger are in a first end position.

[0031] Figure numerals: 1-lubricating oil injection system; 11-first oil injection oil circuit; 12-second oil injection oil circuit; 13-reversing valve; 14-reversing sensor; 2-oil inlet oil circuit; 21-oil inlet; 22-motor; 23-plunger pump; 24-check valve; 25-overflow valve; 26-hydraulic sensor; 3-oil outlet oil circuit; 31-oil outlet; 32-grease container; 33-filter; 4-oil injection distribution valve; 41-first end; 42-second end; 45-first oil inlet; 46-second oil inlet; 47-first oil injection pipeline; 48-second oil injection pipeline; 49-oil injection distribution Mouth; 5-control space; 51-first side; 52-second side; 53-first interface; 54-second interface; 55-third interface; 56-fourth interface; 57-fifth interface; 58-sixth interface; 6-oil filling space; 61-first oil filling chamber; 62-second oil filling chamber; 7-control plunger; 71-first plug head; 72-second plug head; 73-third plug head; 74-first plug rod; 75-second plug rod; 8-oil filling plunger; 81-oil filling plunger head; 82-oil filling plunger rod; 83-limiting part; 84-metering chamber; 85-metering bolt; 86-metering part. DETAILED DESCRIPTION

[0032] With reference to the accompanying drawings and specific embodiments, the structure, composition, characteristics and advantages of the lubricating oil injection system of the present invention and the mining dump truck having the same will be described below in an exemplary manner. However, all descriptions should not be used to form any limitations on the present invention.

[0033] In addition, for any single technical feature described or implied in the embodiments mentioned in this document, or any single technical feature shown or implied in the drawings, the present invention still allows for continued arbitrary combination or deletion between these technical features (or their equivalents) without any technical obstacles, and thus it should be considered that these more embodiments according to the present invention are also within the scope of the description in this document.

[0034] It should also be noted that the terms "inside" and "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships of the lubrication and oil injection system and its components as shown in the accompanying drawings. These are intended only to facilitate the description of the present disclosure and simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the present disclosure.

[0035] In addition, the terms "first," "second," "third," "fourth," "fifth," and "sixth" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly specifying the number of the technical features indicated. Therefore, a feature specified as "first," "second," "third," "fourth," "fifth," and "sixth" may explicitly or implicitly include at least one of the features.

[0036] In the description of the present disclosure, “a plurality of” means at least two, such as two, three or more, unless otherwise clearly defined.

[0037] from Figures 1 to 3 It can be seen that the lubricating oil injection system 1 of the present invention has an oil inlet circuit 2, an oil outlet circuit 3, a first oil injection circuit 11, and a second oil injection circuit 12. The oil inlet circuit 2 and the oil outlet circuit 3 are connected to the first oil injection circuit 11 and the second oil injection circuit 12 through a reversing valve 13. Specifically, the oil inlet circuit 2, the oil outlet circuit 3, the first oil injection circuit 11, and the second oil injection circuit 12 are respectively connected to different interfaces of the reversing valve 13. The ends of the first oil injection circuit 11 and the second oil injection circuit 12 away from the reversing valve 13 are respectively connected to the first oil inlet 45 and the second oil inlet 46 of the oil injection distribution valve 4. The oil injection distribution valve 4 has multiple oil injection distribution ports 49, which are used to connect multiple lubrication points.

[0038] In the present invention, the reversing valve 13 can switch the connection relationship between the oil inlet circuit 2 and the oil outlet circuit 3 and the first oil filling circuit 11 and the second oil filling circuit 12, so that the lubricating grease can enter the oil filling distribution valve 4 through different oil filling circuits, realizing dual-line oil filling.

[0039] Alternatively, as Figure 1 As shown, the present invention may include multiple oil injection distribution valves 4, which can be arranged in series at one end of the first oil injection oil circuit 11 and the second oil injection oil circuit 12, or multiple oil injection distribution valves 4 can be directly connected to the first oil injection oil circuit 11 and the second oil injection oil circuit 12.

[0040] Furthermore, the oil distribution valve 4 may also be provided with a base (not shown), on which is provided an oil passage connecting the first oil injection line 11 and the second oil injection line 12. This oil passage has an interface for communicating with the oil distribution valve 4. Multiple oil distribution valves 4 can be installed in parallel or in series on the base and communicate with the interface on the base to achieve communication between the first oil injection line 11 and the second oil injection line 12 and the multiple oil distribution valves 4. In this way, each oil distribution valve 4 can be removed from the base separately without removing the first oil injection line 11 and the second oil injection line 12, thereby preventing grease contamination.

[0041] The number of the oil injection distribution valves 4 can be increased or decreased according to actual conditions without affecting the operation of other oil injection distribution valves 4 , thereby facilitating the maintenance and replacement of the oil injection distribution valves 4 .

[0042] exist Figure 1 In the embodiment of the present invention, the reversing valve 13 is a two-position four-way reversing valve, and the two-position four-way reversing valve 13 is provided with a reversing sensor 14. The reversing sensor 14 can control the two-position four-way reversing valve to reversing according to the oil filling condition of the oil filling distribution valve 4. Figure 1 When in the middle position, the oil inlet passage 2 is connected with the first oil filling passage 11, and oil is injected into the first oil filling passage 11; at the same time, the oil outlet passage 3 is connected with the second oil filling passage 12, and the second oil filling passage 12 unloads oil to the oil outlet passage 3.

[0043] When the two-position four-way reversing valve is Figure 1 When the position shown is reversed, the oil inlet passage 2 is connected with the second oil filling passage 12 and oil is added to the second oil filling passage 12 ; at the same time, the oil outlet passage 3 is connected with the first oil filling passage 11 and the first oil filling passage 11 unloads oil to the oil outlet passage 3 .

[0044] Further, if Figure 1 As shown, the oil inlet circuit 2 has an oil inlet 21 and a plunger pump 23 arranged near the oil inlet 21. The oil inlet 21 is used to connect to a grease container 32 (such as Figure 2 The oil outlet 3 has an oil outlet 31, which is also connected to a grease container 32 (as shown). Figure 2 The grease container 32 may be provided with a filter 33 , and the filter 33 may filter the lubricating grease in the grease container 32 .

[0045] The plunger pump 23 is driven by the motor 22 and draws lubricating grease from the grease container 32 through the oil inlet 21 into the oil inlet line 2. It should be noted that during use, the lubrication system 1 needs to be repeatedly activated within a fixed period of time to lubricate the equipment's lubrication points. The plunger pump 23 is driven by the motor 22, which reduces the hydraulic shock pressure compared to hydraulic drive, thereby extending the service life of the plunger pump 23.

[0046] Further, according to Figure 1 In the embodiment, the oil inlet circuit 2 can also be provided with a one-way valve 24 downstream of the plunger pump 23. The one-way valve 24 is provided at the rear end of the plunger pump 23 to prevent the lubricating grease in the oil inlet circuit 2 from flowing back.

[0047] A plunger pump 25 and a hydraulic sensor 26 may be provided downstream of the one-way valve 24 . The hydraulic sensor 26 is used to detect the grease pressure in the oil inlet circuit 2 . When the grease pressure exceeds a specified range, the plunger pump 25 may be used to release the pressure.

[0048] It should be noted that the lubricating oil injection system of the present invention can supply equipment that requires oil injection and lubrication, specifically mining dump trucks or other large equipment that requires lubrication.

[0049] Figure 3 This is a cross-sectional schematic diagram of an oil injection distribution valve of an embodiment of a lubricating oil injection system of the present utility model.

[0050] Specifically, the oil filling distribution valve 4 has a first end 41 and a second end 42. The oil filling distribution valve 4 also has a first oil inlet 45, a second oil inlet 46, a first oil filling pipeline 47 and a second oil filling pipeline 48. As mentioned above, the first oil inlet 45 and the second oil inlet 46 are connected to the first oil filling circuit 11 and the second oil filling circuit 12 respectively.

[0051] The first oil injection pipeline 47 and the second oil injection pipeline 48 are connected to a plurality of oil injection distribution ports 49 (such as Figure 1 As shown), optionally, the first oil injection pipeline 47 and the second oil injection pipeline 48 can be connected to the same oil injection distribution port 49 to increase the output of lubricating grease and meet the lubrication needs of multiple lubrication points of large equipment. It can be understood that the first oil injection pipeline 47 and the second oil injection pipeline 48 can also be connected to different oil injection distribution ports 49.

[0052] The oil distribution valve 4 also has a control space 5 and an oil filling space 6. The first oil filling passage 11 and the second oil filling passage 12 communicate with the control space 5 via a first oil inlet 45 and a second oil inlet 46, respectively. A first oil filling pipe 47, a second oil filling pipe 48, and the oil filling space 6 all communicate with the control space 5. The control space 5 controls the oil filling space 6 to either the first oil filling pipe 47 or the second oil filling pipe 48.

[0053] The specific structure of the oil filling space 6 is as follows Figure 4 As shown, an oil filling plunger 8 is provided in the oil filling space 6. The oil filling plunger 8 has an oil filling plunger head 81 and an oil filling plunger rod 82 connected thereto. The oil filling plunger 8 divides the oil filling space 6 into a first oil filling chamber 61 and a second oil filling chamber 62. The diameter of the oil filling plunger head 81 is the same as the inner diameter of the oil filling space 6.

[0054] Furthermore, the oil filling space 6 includes a metering portion 86, which is disposed at one end of the oil filling space 6 and protrudes from the exterior of the oil filling distribution valve 4. A metering cavity 84 is defined within the metering portion 86, into which the oil filling plunger rod 82 can extend. A metering bolt 85 is provided at the end of the metering portion 86. The metering bolt 85 can abut against one end of the oil filling plunger 82, and the depth to which the metering bolt 85 is screwed into the metering portion 86 is adjustable. Adjusting the depth of the screwing of the metering bolt 85 limits the range of movement of the oil filling plunger rod 82, thereby limiting the range of movement of the oil filling plunger 8, thereby controlling the amount of lubricating grease injected into the device.

[0055] Furthermore, a limiting portion 83 is provided at a position of the oiling plunger rod 82 near the oiling plunger head 81. The outer diameter of the limiting portion 83 is smaller than the oiling plunger head 81 and larger than the oiling plunger rod 82. The limiting portion 83 can abut against the end of the metering portion 86, and a gap is formed between the limiting portion 83 and the oiling plunger head 81 to accommodate lubricating grease.

[0056] The specific structure of the control space 5 is as follows Figure 5 As shown, the control space 5 has a first side 51 and a second side 52. The first side 51 of the control space 5 is provided with a first interface 53, a second interface 54, a third interface 55 and a fourth interface 56 in sequence. Figure 5 In the embodiment, the first interface 53 and the fourth interface 56 are respectively disposed near the first end 41 and the second end 42 .

[0057] Combine Figure 3 It can be seen that the first interface 53 and the fourth interface 56 are connected to the first oil inlet 45 and the second oil inlet 46 respectively, thereby respectively connecting to the first oil injection line 11 and the second oil injection line 12. The second interface 54 and the third interface 55 are connected to the first oil injection pipeline 47 and the second oil injection pipeline 48 respectively.

[0058] The second side 52 of the control space 5 is provided with a fifth interface 57 and a sixth interface 58 in sequence. The fifth interface 57 is provided between the first interface 53 and the second interface 54. The fifth interface 57 is connected to the second oil filling chamber 62. Figure 3 and Figure 4 It can be seen that the sixth interface 58 is provided between the third interface 55 and the fourth interface 56 , and the sixth interface 58 is connected to the first oil filling chamber 61 .

[0059] The control space 5 is used to place the control plunger 7, which can move along its length in the control space 5. Figure 5 It can be clearly seen that the control plunger 7 is provided with a first plug 71 , a second plug 72 and a third plug 73 in sequence, and the outer diameters of the first plug 71 , the second plug 72 and the third plug 73 are the same as the inner diameter of the control space 5 .

[0060] The first plug 71 and the second plug 72 are connected by a first plug rod 74, and the second plug 72 and the third plug 73 are connected by a second plug rod 75. The outer diameters of the first plug rod 74 and the second plug rod 75 are smaller than the outer diameters of the first plug 71, the second plug 72 and the third plug 73.

[0061] according to Figure 5 In the embodiment, both ends of the first plug 71, the second plug 72 and the third plug 73 have chamfers, so that the outer diameters of the ends of the first plug 71, the second plug 72 and the third plug 73 are smaller than the plug bodies, so as to facilitate the lubricating grease to enter the control space 5 from the ends, and also facilitate the lubricating grease to push the control plunger 7 to move.

[0062] The lengths of the first plug 71, the second plug 72 and the third plug 73 are all greater than the dimensions of the interfaces of the control space 5 along the length direction of the control space 5, that is, the diameters of the interfaces, and the length of the first plug 71 is less than the distance between the first interface 53 and the fifth interface 57, thereby ensuring that when the first plug 71 blocks the first interface 53, the fifth interface 57 is opened.

[0063] The length of the second plug 72 is smaller than the distance between the second interface 54 and the third interface 55 . The second plug 72 is located between the second interface 54 and the third interface 55 and can move within the area between the second interface 54 and the third interface 55 to isolate the second interface 54 and the third interface 55 .

[0064] The length of the third plug 73 is smaller than the distance between the fourth interface 56 and the sixth interface 58 , thereby ensuring that when the third plug 73 blocks the fourth interface 56 , the sixth interface 58 is opened.

[0065] The working principle of the lubricating oil filling system 1 is described below. When filling oil, the motor 22 drives the plunger pump 23 to introduce the lubricating grease in the grease container 32 into the oil inlet 2 through the oil inlet 21. The lubricating grease passes through the oil inlet 2 through the reversing valve 13 (such as Figure 1 As shown) enters the first oil filling circuit 11.

[0066] The initial positions of the control plunger 7 and the oil filling plunger 8 in the oil filling distribution valve 4 are as follows: Figure 6 The second end 42 is shown in the position, and initially, no lubricating grease is injected into the control space 5 and the oil injection space 6 of the oil injection distribution valve 4 .

[0067] First, if Figure 6 As shown by the downward curved arrow in the figure, the lubricating grease enters the first end 41 of the control space 5 through the first oil inlet 45 and the first interface 53 of the oil filling distribution valve 4, and enters the second oil filling chamber 62 of the oil filling space 6 through the fifth interface 57 to fill the second oil filling chamber 62.

[0068] When the reversing sensor 14 detects that the second oil filling chamber 62 is full, the reversing valve 13 is switched so that the lubricating grease passes through the oil inlet passage 2 and the reversing valve 13 into the second oil filling passage 12. Figure 7 As shown by the downward curved arrow in the figure, the lubricating grease enters the second end 42 of the control space 5 through the second oil inlet 46 and the fourth interface 56 of the oil filling distribution valve 4, generating pressure on the control plunger 7, pushing the control plunger 7 to move toward the first end 41 as shown by the straight arrow in the figure, away from the fourth interface 56, so as to fully open the fourth interface 56 and open the sixth interface 58, so that the lubricating grease is Figure 7 As shown by the downward curved arrow in the middle, the oil enters the first oil filling chamber 61 through the sixth interface 58 .

[0069] At the same time, the lubricating grease located at the first end 41 of the control space 5 is squeezed by the first plug 71 and discharged to the first oil inlet 45 through the first interface 53 to the first oil filling circuit 11 and enters the oil outlet circuit 3 through the reversing valve 13, and is discharged into the grease container 32 through the oil outlet 31 until the first plug 71 blocks the first interface 53, cutting off the discharge of the lubricating grease through the first oil inlet 45.

[0070] During the movement of the control plunger 7, after the first plug head 71 crosses the fifth interface 57, the first plug rod 74 is located between the second interface 54 and the fifth interface 57 (combined Figure 5 As shown), the second oil injection chamber 62 (combined Figure 4 The lubricating grease in Figure 7 As shown by the upward curved arrow, the oil flows through the fifth interface 57 to the control space 5 and passes through the first plug rod 74, and flows through the second interface 54 to the first oil injection pipeline 47, and then through the oil injection distribution port 49 (as shown in FIG. Figure 1(as shown) fill the lubrication point with oil until the lubricating grease in the second oil filling chamber 62 is drained.

[0071] Then, when the reversing sensor 14 detects that the lubricating grease in the second oil filling chamber 62 is emptied, the reversing valve 13 is switched, and the lubricating grease is connected to the first oil filling passage 11 through the reversing valve 13 again through the oil inlet passage 2, and Figure 6 As shown by the downward curved arrow, the second oil injection chamber 62 is entered, and the control plunger 7 and the oil injection plunger 8 are moved as shown by the lubricating grease. Figure 6 As shown by the straight arrow in FIG. 4 , the spherical member 20 is pushed toward the second end 42.

[0072] The third plug 73 of the control plunger 7 discharges the lubricating grease at the second end 42 of the control space 5 through the second oil inlet 46, the first oil filling passage 11, and the oil outlet passage 3 to the grease container. The third plug 73 is then located at the second end 42 and blocks the fourth port 56, thereby blocking the second oil inlet 46.

[0073] During this process, when the third plug 73 crosses the sixth interface 58, Figure 6 As shown by the upward arrow of the curve, the lubricating grease in the first oil filling chamber 61 flows through the sixth interface 58 and the second plug rod 75 to the fourth interface 56 (combined with Figure 5 As shown), and oil is injected into the oil injection distribution port 49 through the second oil injection pipeline 48.

[0074] In this cycle, the reversing valve 13 is switched multiple times, and dual-line oil injection is performed alternately through the first oil injection pipeline 48 and the second oil injection pipeline 48 .

[0075] The present invention also provides a lubrication system, which includes the aforementioned lubricating oil filling system. The oil inlet 21 and the oil outlet 31 of the lubricating oil filling system are both connected to a grease container 32. The grease container 32 may also be provided with a filter 33. The filter 33 is used to filter impurities in the lubricating grease. The oil filling distribution ports 49 of the oil filling distribution valve 4 of the lubricating oil filling system 1 are respectively connected to the oil filling points.

[0076] The present invention further provides a mining dump truck, which includes the aforementioned lubricating oil filling system 1, wherein the oil inlet line 2 and the oil outlet line 3 of the lubricating oil filling system 1 are respectively connected to the grease container 32, and the oil filling distribution valve 4 thereof is connected to the lubrication point of the mining dump truck.

[0077] In summary, the oil distribution valve 4 of the present invention utilizes a sliding plunger to perform alternating bidirectional oil injection. This arrangement results in a compact structure, freeing up installation space and reducing costs. Furthermore, the plunger is actuated and reset by minimal grease pressure. Even in low-temperature environments, where the lubrication system experiences significant pressure loss due to long pipelines, increased pipe resistance, and grease viscosity, the plunger of the oil distribution valve 4 can operate normally with minimal grease pressure, forming a closed-loop pipeline circulation system and thus improving the stability and reliability of the lubrication system.

[0078] Since the lubricating oil injection system 1 of the present invention can realize dual-line lubrication, the hydraulic pressure required for each oil injection distribution valve 4 to drive the plunger therein is low, so the driving hydraulic pressure consumption is small, and most of the hydraulic pressure can be supplied to the lubrication point. Therefore, the lubricating oil injection system 1 can supply large equipment with many lubrication points and long pipelines.

[0079] The technical scope of the present invention is not limited to the contents of the above description. Those skilled in the art can make various deformations and modifications to the above implementation without departing from the technical concept of the present invention, and these deformations and modifications should all fall within the scope of the present invention.

Claims

1. A lubricating oil injection system, characterized in that: The lubricating oil injection system (1) comprises an oil inlet oil circuit (2), an oil outlet oil circuit (3), a first oil injection oil circuit (11), a second oil injection oil circuit (12), a reversing valve (13), and an oil injection distribution valve (4); The reversing valve (13) is arranged between the oil inlet circuit (2) and the oil outlet circuit (3) and the first oil filling circuit (11) and the second oil filling circuit (12). The ends of the first oil filling circuit (11) and the second oil filling circuit (12) away from the reversing valve (13) are connected to different oil inlets of the oil filling distribution valve (4). The oil filling distribution valve (4) leads to the lubrication point through the oil filling distribution port (49). The reversing valve (13) can switch the connection relationship between the oil inlet circuit (2) and the oil outlet circuit (3) and the first oil filling circuit (11) and the second oil filling circuit (12), so that lubricating grease can enter the oil filling distribution valve (4) through different oil filling circuits.

2. The lubricating oil injection system according to claim 1, characterized in that: The oil injection distribution valve (4) is provided with a control space (5), an oil injection space (6), a first oil injection pipeline (47) and a second oil injection pipeline (48). The first oil injection pipeline (47) and the second oil injection pipeline (48) are connected to the oil injection distribution port (49), and the first oil injection oil circuit (11), the second oil injection oil circuit (12), the first oil injection pipeline (47), the second oil injection pipeline (48) and the oil injection space (6) are all connected to the control space (5). The control space (5) can control the connection state of the first oil injection oil circuit (11) and the second oil injection oil circuit (12) with the oil injection space (6), and the connection state of the oil injection space (6) with the first oil injection pipeline (47) or the second oil injection pipeline (48), so that the oil injection space (6) injects oil into the first oil injection pipeline (47) or the second oil injection pipeline (48).

3. The lubricating oil injection system according to claim 2, characterized in that: An oil injection plunger (8) is provided in the oil injection space (6), and the oil injection plunger (8) divides the oil injection space (6) into a first oil injection chamber (61) and a second oil injection chamber (62); A control plunger (7) is provided in the control space (5). When the lubricating grease enters the oil filling distribution valve (4) through different oil filling oil paths, the control plunger (7) can move in different directions in the control space (5), so that the lubricating grease enters the first oil filling chamber (61) or the second oil filling chamber (62), and flows to the first oil filling pipe (47) or the second oil filling pipe (48) through the second oil filling chamber (62) or the first oil filling chamber (61).

4. The lubricating oil injection system according to claim 3, characterized in that: The control space (5) has a first side (51) and a second side (52), The first side (51) of the control space (5) is provided with a first interface (53), a second interface (54), a third interface (55), and a fourth interface (56) in sequence. The first interface (53) and the fourth interface (56) are connected to the first oil injection circuit (11) and the second oil injection circuit (12), respectively. The second interface (54) and the third interface (55) are connected to the first oil injection pipeline (47) and the second oil injection pipeline (48), respectively. The second side (52) of the control space (5) is provided with a fifth interface (57) and a sixth interface (58) in sequence. The fifth interface (57) is relatively arranged between the first interface (53) and the second interface (54), and the fifth interface (57) is connected to the second oil injection chamber (62); the sixth interface (58) is relatively arranged between the third interface (55) and the fourth interface (56), and the sixth interface (58) is connected to the first oil injection chamber (61). By moving the control plunger (7), the connection and blocking of different interfaces can be achieved.

5. The lubricating oil injection system according to claim 4, characterized in that: The control plunger (7) is provided with a first plug (71), a second plug (72) and a third plug (73) in sequence, the first plug (71) and the second plug (72) are connected via a first plug rod (74), and the second plug (72) and the third plug (73) are connected via a second plug rod (75); The first plug (71) is capable of blocking the first interface (53) and opening the fifth interface (57); the second plug (72) is located between the second interface (54) and the third interface (55) to isolate the second interface (54) and the third interface (55); and the third plug (73) is capable of blocking the fourth interface (56) and opening the sixth interface (58).

6. The lubricating oil injection system according to claim 3, characterized in that: The oil injection plunger (8) comprises an oil injection plunger head (81), an oil injection plunger rod (82) and a metering portion (86); the oil injection plunger head (81) and the oil injection plunger rod (82) are connected; the oil injection plunger head (81) divides the oil injection space (6) into the first oil injection chamber (61) and the second oil injection chamber (62); the metering portion (86) is provided at one end of the oil injection space (6), and the oil injection plunger rod (82) extends into the metering portion (86) and is movable relative to the metering portion (86).

7. The lubricating oil injection system according to claim 6, characterized in that: The oil injection plunger rod (82) is provided with a limiting portion (83) near the oil injection plunger head (81); the outer diameter of the limiting portion (83) is smaller than that of the oil injection plunger head (81) and larger than that of the oil injection plunger rod (82); a gap is formed between the limiting portion (83) and the oil injection plunger head (81) to accommodate lubricating grease.

8. The lubricating oil injection system according to claim 6, characterized in that: A metering bolt (85) is provided at the end of the metering portion (86), and the metering bolt (85) can abut against the end of the oil injection plunger rod (82) away from the oil injection plunger head (81), and the depth of the metering bolt (85) screwed into the metering portion (86) is adjustable.

9. The lubricating oil injection system according to claim 1, characterized in that: The oil inlet circuit (2) is provided with an oil inlet (21) and a plunger pump (23) arranged near the oil inlet (21); the plunger pump (23) is driven by a motor (22) to introduce lubricating grease from the oil inlet (21) into the oil inlet circuit (2).

10. A mining dump truck, characterized in that: The mining dump truck comprises the lubricating oil injection system according to any one of claims 1 to 9, wherein the oil inlet circuit (2) and the oil outlet circuit (3) of the lubricating oil injection system are respectively connected to a grease container (32).

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