Oil pumping assembly and oiling machine

Abstract

The utility model discloses an oil pumping assembly and an oiling machine, the oil pumping assembly comprises an oil pumping rod group, the top of the oil pumping rod group is connected with an oil bag, the bottom of the oil pumping rod group is connected with an oil conveying pipe, and the oil pumping rod group pumps out oil in the oil bag through the oil conveying pipe; the oil pumping rod set comprises an oil pumping pipe and an oil pumping screw, the oil pumping screw penetrates through the oil pumping pipe and can slide relative to the oil pumping pipe in the axis direction of the oil pumping screw, and the sliding distance of the oil pumping screw is in positive correlation with the unit oil injection amount. The intermediate gear is in transmission connection with the oil pumping screw and used for driving the oil pumping screw to slide in the axis direction of the intermediate gear; the end cover plate is mounted at the end part of the intermediate gear; the end cover plate is provided with a detection structure, the detection structure is used for detecting the sliding distance of the oil pumping screw rod, and when the oil pumping screw rod slides to a set position, the detection structure sends out a signal to control the intermediate gear to stop acting. According to the oil pumping assembly and the oiling machine, the size is small, the structure is simple, the oiling outlet pressure is high, and the oil pumping assembly and the oiling machine can be suitable for long-distance oiling scenes.

Description

Technical Field

[0001] The utility model relates to the technical field of oil injection machines, in particular to an oil pump component and an oil injection machine. Background Art

[0002] As equipment production gradually moves towards intelligence, automation and unmanned operation, corresponding automatic oiling machines are needed to lubricate mechanical equipment that needs to run for a long time or is difficult for humans to access. The unit oil injection volume of the automatic oiling machine refers to the amount of grease injected into the mechanical equipment by the automatic oiling machine within the set time. However, most of the current oiling machines have problems with difficulty in adjusting the unit oil injection volume and inaccurate control of the unit oil injection volume. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides an oil pump assembly, which is convenient to adjust the unit oil injection amount and can accurately control the unit oil injection amount.

[0004] The utility model also provides an oil injection machine with the oil pump assembly.

[0005] The oil pump assembly according to the first embodiment of the utility model comprises:

[0006] The oil pump rod assembly is connected to the grease bag at the top and is connected to the oil delivery pipe at the bottom. The oil pump rod assembly pumps the grease in the grease bag out through the oil delivery pipe. The oil pump rod assembly includes an oil pump pipe and an oil pump screw. The oil pump screw is inserted into the oil pump pipe and can slide relative to the oil pump pipe along its own axis. The sliding distance of the oil pump screw is positively correlated with the unit oil injection amount.

[0007] An intermediate gear is connected to the oil pump screw for driving the oil pump screw to slide along its own axis;

[0008] An end cover plate is installed on the end of the intermediate gear; the end cover plate is installed with a detection structure, and the detection structure is used to detect the sliding distance of the oil pumping screw. When the oil pumping screw slides to a set position, the detection structure sends a signal to control the intermediate gear to stop moving.

[0009] The oil pump assembly according to the embodiment of the utility model has at least the following beneficial effects:

[0010] The unit oil injection amount is indirectly controlled by controlling the sliding distance of the oil pumping screw. Compared with directly controlling the unit oil injection amount, controlling the sliding distance of the oil pumping screw is simpler and more accurate, thereby improving the accuracy of the unit oil injection amount. A detection structure is set on the end cover plate to detect the sliding distance of the oil pumping screw, and the intermediate gear is controlled to stop according to the detection structure. The control method is simple, and the unit oil injection amount can be changed by changing the detection parameters of the detection structure, and the unit oil injection amount is convenient to adjust.

[0011] According to some embodiments of the utility model, the oil pumping screw is connected to a radially protruding oil pumping gear, the intermediate gear is sleeved on the outer periphery of the oil pumping gear and is transmission connected to the oil pumping gear; the outer side wall of the intermediate gear is connected to a power device that drives it to rotate around its own axis, and the rotation of the intermediate gear around its own axis can drive the oil pumping screw to slide along the direction of its own axis.

[0012] According to some embodiments of the present utility model, the detection structure is used to detect the distance between the end cover plate and the oil pump gear.

[0013] According to some embodiments of the present invention, the end cover plates are installed at both ends of the intermediate gear in the length direction.

[0014] According to some embodiments of the utility model, the end cover plate is connected to a limiting structure for fixing its position, and a ball bearing is provided between the intermediate gear and the end cover plate.

[0015] According to some embodiments of the utility model, a mounting groove is provided on a side of the end cover plate facing away from the intermediate gear, and the mounting groove is covered with a protective sheet; the detection structure is installed in the mounting groove.

[0016] According to some embodiments of the utility model, the oil delivery pipe is sleeved on the oil pumping screw, and the oil delivery pipe restricts the oil pumping screw from rotating around its own axis.

[0017] According to some embodiments of the utility model, the end of the intermediate gear is provided with a semicircular groove, the end cover plate is provided with an annular groove, and the annular groove corresponds to the semicircular groove; and / or, the end of the intermediate gear is provided with an annular groove, the end cover plate is provided with a semicircular groove, and the annular groove corresponds to the semicircular groove;

[0018] The ball is installed between the semicircular groove and the annular groove.

[0019] According to some embodiments of the utility model, the grease bag is provided with an oil outlet pipe, the top of the oil pump pipe is penetrated into the oil outlet pipe and is sealedly connected to the oil outlet pipe; the oil pump pipe is provided with a first through hole axially penetrating the oil pump pipe, and a first one-way valve is provided at the top of the first through hole; the top of the oil pump screw is movably penetrated into the oil pump pipe and is sealedly connected to the oil pump pipe; the oil pump screw is provided with a second through hole axially penetrating the oil pump screw, and a second one-way valve is provided at the top of the second through hole; an oil pump chamber is formed between the first one-way valve and the second one-way valve, and the sliding of the oil pump screw relative to the oil pump pipe will drive the volume change of the oil pump chamber, thereby pumping out the grease in the grease bag.

[0020] The oil injection machine according to the second embodiment of the utility model includes the above-mentioned oil pump assembly; because the oil injection machine includes the above-mentioned oil pump assembly, it at least has all the beneficial effects of the oil pump assembly.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention is further described below with reference to the accompanying drawings and embodiments, wherein:

[0023] Figure 1 It is a structural schematic diagram of an oil pump assembly according to an embodiment of the first aspect of the utility model;

[0024] Figure 2 This is a schematic diagram of the assembly of the oil pump screw and the intermediate gear of an embodiment of the utility model;

[0025] Figure 3 It is a bottom view assembly diagram of the oil pump screw and the intermediate gear of the embodiment of the utility model;

[0026] Figure 4 A cross-sectional view of an oil pump assembly according to an embodiment of the first aspect of the utility model;

[0027] Figure 5 for Figure 4 Enlarged view of point A in the middle.

[0028] Figure Number:

[0029] Grease bag 100, oil outlet pipe 110;

[0030] The oil pump pipe 200, the first through hole 210, the oil pump chamber 211, the first one-way valve 220, the first guide hole 221, and the first ball 222;

[0031] The oil pumping screw 300, the second through hole 310, the second one-way valve 320, the second guide hole 321, the second ball 322, the pressing spring 323, and the oil pumping gear 330;

[0032] The intermediate gear 400 , the semicircular groove 401 , the end cover plate 410 , the mounting groove 411 , the detection structure 412 , the annular groove 413 , and the protective sheet 420 . DETAILED DESCRIPTION

[0033] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0034] In the description of the present invention, it should be understood that the descriptions involving orientation, such as the orientation or positional relationship indicated as up, down, etc., are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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 invention.

[0035] In the description of the present utility model, "a plurality" means more than two. If there is a description of "first" or "second", it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0036] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0037] Reference Figures 1 to 5The oil pump assembly of the first embodiment of the utility model comprises a grease bag 100, an oil pump pipe 200, an oil pump screw 300 and an intermediate gear 400 arranged in sequence from top to bottom. The bottom of the grease bag 100 is provided with an oil outlet pipe 110, and the top of the oil pump pipe 200 is penetrated in the oil outlet pipe 110 and is sealed and connected with the oil outlet pipe 110 to reduce the outflow of grease; the oil pump pipe 200 is provided with a first through hole 210 axially penetrating the oil pump pipe 200, and the top of the first through hole 210 is provided with a first one-way valve 220; to ensure that the grease bag The grease in 100 can only flow from the grease bag 100 to the pump oil pipe 200, and the grease entering the pump oil pipe 200 cannot return to the grease bag 100; the size of the first one-way valve 220 does not exceed the diameter of the pump oil pipe 200, so as to reduce the volume of the pump oil assembly; the first one-way valve 220 is arranged at the top of the first through hole 210. Such a design can prevent more grease from entering the pump oil pipe 200, thereby reducing the risk of the grease in the pump oil pipe 200 deteriorating and clogging the pump oil pipe 200 over a long period of time.

[0038] Further, see Figure 4 , Figure 5 As shown, the top of the oil pumping screw 300 is movably arranged in the oil pumping pipe 200 and is sealed and connected to the oil pumping pipe 200; the oil pumping screw 300 is provided with a second through hole 310 axially penetrating the oil pumping screw 300, and a second one-way valve 320 is provided at the top of the second through hole 310, and the size of the second one-way valve 320 does not exceed the diameter of the top of the oil pumping screw 300; an oil pumping chamber 211 is formed between the first one-way valve 220 and the second one-way valve 320, and the sliding of the oil pumping screw 300 relative to the oil pumping pipe 200 will drive the volume of the oil pumping chamber 211 to change; the second one-way valve 320 is arranged at the top of the second through hole 310, and such a design can prevent more grease from accumulating in the oil pumping chamber 211, thereby reducing the risk of the grease in the oil pumping chamber 211 deteriorating and clogging the first one-way valve 220 or the second one-way valve 320 over a long period of time.

[0039] In the embodiment of the present utility model, the intermediate gear 400 is connected to the oil pumping screw 300 for driving the oil pumping screw 300 to slide relative to the oil pumping pipe 200, thereby realizing the change of the volume of the oil pumping chamber 211. Figure 4 , Figure 5As shown, the top of the oil pumping pipe 200 is inserted into the oil outlet pipe 110, and a sealing ring is provided between the outer wall of the oil pumping pipe 200 and the inner wall of the oil outlet pipe 110, ensuring that the grease in the grease bag 100 can only enter the first through hole 210 of the oil pumping pipe 200 through the first one-way valve 220; the top of the oil pumping screw 300 is inserted into the first through hole 210, and a sealing ring is also provided between the outer wall of the oil pumping screw 300 and the inner wall of the first through hole 210, ensuring that the grease entering the first through hole 210 can only enter the second through hole 310 of the oil pumping screw 300 through the second one-way valve 320. The oil pumping cavity 211 is formed at the top of the oil pumping screw 300, and the volume of the oil pumping cavity 211 will change as the oil pumping screw 300 slides relative to the oil pumping pipe 200. The oil pump screw 300 is driven by the intermediate gear 400 to slide relative to the oil pump pipe 200, thereby driving the volume change of the oil pump chamber 211 to pump out the grease in the grease bag 100. The structure is simple, easy to reduce the volume, and has good environmental adaptability. The grease in the grease bag 100 is pumped out by the change of the oil pump chamber 211, which can play a role similar to a piston, so that the output grease can be repeatedly pressurized by multiple changes in the volume of the oil pump chamber 211, thereby increasing the oil injection outlet pressure of the oil injection machine, making it suitable for long-distance oil injection scenarios; the oil pump pipe 200 is provided with a first one-way valve 220, and the oil pump screw 300 is provided with a second one-way valve 320, which can ensure the one-way flow of grease and avoid ineffective workmanship of the oil pump assembly.

[0040] In the embodiment of the utility model, the oil pumping screw 300 is connected to the oil pumping gear 330, and the intermediate gear 400 is sleeved on the outer periphery of the oil pumping gear 330 and is transmission-connected with the oil pumping gear 330. Figure 2 , Figure 3 As shown, the oil pumping gear 330 is arranged in the middle of the oil pumping screw 300, and the oil pumping gear 330 is preferably fixedly connected to the oil pumping screw 300, for example, integrally formed or welded. The intermediate gear 400 is cylindrical, and the center of the intermediate gear 400 is provided with an intermediate hole axially penetrating the intermediate gear 400, the inner side wall of the intermediate hole is provided with an internal thread, and the outer side wall of the oil pumping gear 330 is provided with an external thread, and the oil pumping gear 330 is installed in the intermediate hole and is threadedly connected to the intermediate hole; the axial length of the intermediate hole is greater than the axial length of the oil pumping gear 330.

[0041] Furthermore, in the embodiment of the utility model, the bottom end of the oil pumping screw 300 is sleeved with an oil delivery pipe, which is not shown in the attached drawings. The oil delivery pipe is used to limit the oil pumping screw 300 to rotate around its own axis, that is, the oil delivery pipe is used to limit the oil pumping screw 300 to slide only along its axis. The outer peripheral wall of the intermediate gear 400 is connected to a power device in a transmission manner, and the power device is used to drive the intermediate gear 400 to rotate around its own axis. The rotation of the intermediate gear 400 can drive the oil pumping screw 300 to slide along its own axis. The outer side wall of the intermediate gear 400 is also provided with teeth, and the outer side wall of the intermediate gear 400 is also connected to the power device through a tooth transmission. The tooth transmission is efficient and convenient for reducing the volume. The power device can be a motor or other equipment. The rotation of the intermediate gear 400 drives the oil pumping screw 300 to slide axially, thereby causing the volume of the oil pumping chamber 211 to change, thereby realizing the pumping out of the grease in the grease bag 100.

[0042] In the embodiment of the present utility model, at least one end of the intermediate gear 400 is installed with an end cover plate 410, and the end cover plate 410 is installed with a detection structure 412, and the detection structure 412 is used to detect the distance between the end surface of the oil pump gear 330 and the end cover plate 410. Figure 2 , Figure 3 As shown, the detection structure 412 can know the axial sliding distance of the oil pumping screw 300 by detecting the distance between the end face of the oil pumping gear 330 and the end cover plate 410, and then the volume change of the oil pumping chamber 211 can be calculated, and then the amount of grease pumped out of the oil pumping chamber 211 at a time, that is, the unit oil pumping amount, can be calculated. When the detection structure 412 detects that the distance between the end face of the oil pumping gear 330 and the end cover plate 410 reaches the set distance, the detection structure 412 sends a signal, and then the power device stops driving the intermediate gear 400 to rotate, and then the oil pumping screw 300 stops sliding, thereby achieving precise adjustment of the unit oil pumping amount; by changing the set distance, the single oil pumping amount of the oil pumping assembly of this embodiment can be adjusted. The specific set distance can be adjusted according to actual conditions and is not limited here. When the distance between the end face of the oil pumping gear 330 and the end cover plate 410 reaches the set distance, the oil pumping screw 300 slides to the set position.

[0043] Further, see Figure 2 , Figure 3 As shown, a mounting groove 411 is provided on the side of the end cover plate 410 away from the intermediate gear 400, and a detection structure 412 is installed in the mounting groove 411; two mounting grooves 411 are provided on the end cover plate 410, and detection structures 412 are installed in both mounting grooves 411. The detection structure 412 can be a touch switch or a distance sensor, etc. The two detection structures 412 are provided on the end cover plate 410, which can play a role of backup for each other to ensure the accuracy of the data.

[0044] In an embodiment of the utility model, the mounting groove 411 is covered with a protective sheet 420; specifically, the area of ​​the protective sheet 420 is substantially consistent with the area of ​​the end cover plate 410, and the protective sheet 420 protects the detection structure 412 in the mounting groove 411, and can also play a role in reducing the interference of the equipment to the detection structure 412 to a certain extent.

[0045] In the embodiments of the present invention, referring to Figure 2 , Figure 3 As shown, both ends of the intermediate gear 400 are provided with end cover plates 410, and both end cover plates 410 are provided with detection structures 412. Specifically, both ends of the intermediate gear 400 are provided with end cover plates 410, which can play a role in limiting the intermediate gear 400, thereby improving the stability of the intermediate gear 400; both end cover plates 410 are provided with detection structures 412, so that each detection structure 412 only needs to detect one distance, and can share the same set spacing, the logic is simpler, and the probability of failure in a long-term harsh environment is lower. For example, the detection structure 412 of the end cover plate 410 arranged at the upper end of the intermediate gear 400 only sends a signal when the oil pumping screw 300 moves upward to a set spacing. Similarly, the detection structure 412 of the end cover plate 410 arranged at the lower end of the intermediate gear 400 only sends a signal when the oil pumping screw 300 moves downward to a set spacing. That is, all the detection structures 412 only send signals at a set spacing, and there is only one set spacing. The control parameters are few and the control logic is simple, which is suitable for oil injection machines that operate in harsh environments for a long time.

[0046] In the embodiment of the present utility model, a ball bearing is provided between the intermediate gear 400 and the end cover plate 410. Figure 2 , Figure 3As shown, the upper end surface of the intermediate gear 400 is provided with a plurality of semicircular grooves 401 evenly spaced around the circumference, and the lower surface of the end cover plate 410 installed above the intermediate gear 400 is provided with an annular groove 413, and the ball is spherical and is not shown in the drawings; the plurality of balls are respectively installed in the plurality of semicircular grooves 401, and the end cover plate 410 above the intermediate gear 400 falls on the ball, that is, there is a partial spacing between the end cover plate 410 and the intermediate gear 400, but the spacing is very small. It should be understood that the end cover plate 410 is connected with a limiting structure for fixing its position, so when the intermediate gear 400 rotates around its own axis, the end cover plate 410 does not rotate synchronously, so there is relative rotation between the intermediate gear 400 and the end cover plate 410. By arranging balls between the end cover plate 410 and the intermediate gear 400, the friction force when the intermediate gear 400 and the end cover plate 410 slide relative to each other can be reduced, thereby reducing the wear of the intermediate gear 400 and the end cover plate 410 and extending the service life of the intermediate gear 400 and the end cover plate 410. The number of balls between the intermediate gear 400 and the end cover plate 410 can be specifically set according to actual conditions.

[0047] Further, see Figure 2 , Figure 3 As shown, the lower surface of the intermediate gear 400 is provided with an annular groove 413, and the upper surface of the end cover plate 410 installed below the intermediate gear 400 is provided with a semicircular groove 401. This design is for ease of installation. Because in most cases the oil pump assembly of this embodiment is used vertically, it is more convenient to set the semicircular groove 401 on the lower part. However, it is conceivable that it can also be specifically configured according to actual conditions. For example, annular grooves 413 may be provided on the upper and lower surfaces of the intermediate gear 400, a semicircular groove 401 may be provided on the lower surface of the end cover plate 410 above the intermediate gear 400, and a semicircular groove 401 may be provided on the upper surface of the end cover plate 410 below the intermediate gear 400; or semicircular grooves 401 may be provided on the upper and lower surfaces of the intermediate gear 400, an annular groove 413 may be provided on the lower surface of the end cover plate 410 above the intermediate gear 400, and an annular groove 413 may be provided on the upper surface of the end cover plate 410 below the intermediate gear 400; or an annular groove 413 may be provided on the upper surface of the intermediate gear 400, a semicircular groove 401 may be provided on the lower surface of the end cover plate 410 above the intermediate gear 400, a semicircular groove 401 may be provided on the lower surface of the intermediate gear 400, and an annular groove 413 may be provided on the upper surface of the end cover plate 410 below the intermediate gear 400.

[0048] In the embodiments of the present invention, referring to Figure 4 , Figure 5As shown, the first one-way valve 220 is provided with a first guide hole 221; the second one-way valve 320 is provided with a second guide hole 321; when the volume of the pump oil chamber 211 increases, the grease in the grease bag 100 enters the first guide hole 221; when the volume of the pump oil chamber 211 decreases, the grease in the first guide hole 221 enters the pump oil chamber 211, and the grease in the pump oil chamber 211 enters the second guide hole 321.

[0049] Reference Figure 5 As shown, in the embodiment of the present utility model, the first end of the first guide hole 221 is communicated with the oil outlet pipe 110, and the second end of the first guide hole 221 is communicated with the pump oil chamber 211. The aperture of the middle part of the first guide hole 221 is larger than the apertures of the first end and the second end, and the aperture of the first end is substantially the same as the aperture of the second end; a first rolling ball is slidably installed in the first guide hole 221, and the first rolling ball is slidably installed in the middle position of the first guide hole 221, and the diameter of the first rolling ball is substantially equal to the aperture of the middle part of the first guide hole 221. The volume change of the pump oil chamber 211 can drive the first rolling ball to slide along the length direction of the first guide hole 221 to seal the first end or the second end of the first guide hole 221. When the volume in the oil pump chamber 211 increases, the air pressure in the oil pump chamber 211 will decrease, thereby driving the first rolling ball to descend and seal the second end of the first guide hole 221. The first end of the first guide hole 221 is communicated with the grease bag 100, so that the grease in the grease bag 100 can enter the first guide hole 221; when the volume in the oil pump chamber 211 decreases, the air pressure in the oil pump chamber 211 will increase, thereby pushing the first rolling ball to ascend and seal the first end of the first guide hole 221. The second end of the first guide hole 221 is communicated with the oil pump chamber 211, so that the grease in the first guide hole 221 can enter the oil pump chamber 211.

[0050] Reference Figure 5As shown, the first end of the second guide hole 321 is connected to the pump oil chamber 211, and the second end of the second guide hole 321 is connected to the second through hole 310. The aperture of the middle part of the second guide hole 321 is larger than the aperture of the first end and the second end, and the aperture of the first end is substantially the same as the aperture of the second end; a second ball and a clamping spring 323 are slidably installed in the second guide hole 321, and the second ball is slidably installed in the middle position of the second guide hole 321, and the diameter of the second ball is substantially equal to the aperture of the middle part of the second guide hole 321; the clamping spring 323 is also installed in the middle position of the second guide hole 321, and the two ends of the clamping spring 323 are respectively abutted against the second ball and the second end of the second guide hole 321, and the clamping spring 323 is used to push the second ball to seal the first end of the second guide hole 321; when the volume of the pump oil chamber 211 is reduced, the second ball can be driven to move toward the second end and compress the clamping spring 323. Specifically, the bottom of the oil pump screw 300 is used to connect to the oil pipeline, which is not shown in the drawings. The oil pipeline is connected to the second through hole 310, so the pressure below the second one-way valve 320 in the second through hole 310 is basically atmospheric pressure. When the volume in the oil pump chamber 211 increases, the air pressure in the oil pump chamber 211 will decrease. At this time, the pressure in the oil pump chamber 211 is less than the atmospheric pressure. Therefore, the second ball will rise under the action of the holding spring 323 and the atmospheric pressure to seal the first end of the second guide hole 321. At this time, the grease in the oil pump chamber 211 cannot enter the second guide hole 321, but the grease in the second guide hole 321 can enter the second through hole 310; when the volume in the oil pump chamber 211 decreases, the air pressure in the oil pump chamber 211 will be greater than the atmospheric pressure, so that the pressure in the oil pump chamber 211 will push the second ball down a certain distance and compress the holding spring 323. When the second ball drops a certain distance, the grease in the oil pump chamber 211 will enter the second guide hole 321, and the grease in the second guide hole 321 can also enter the second through hole 310.

[0051] As can be seen from the above, the change in the volume of the pump oil chamber 211 causes the change in the pressure value in the pump oil chamber 211, which in turn drives the first one-way valve 220 and the second one-way valve 320 to operate, thereby achieving the pumping out of the grease. When injecting oil over a long distance, the oil pipeline will be relatively long, and the diameter of the oil pipeline will be relatively small, so the inner wall of the oil pipeline will hinder the flow of grease. The longer the length of the oil pipeline, the greater the resistance to pumping the grease out of the oil pipeline. Therefore, the oil injection outlet pressure at the bottom of the oil pump screw 300 also needs to be increased. This embodiment realizes oil pumping by changing the volume of the pump oil chamber 211, which can have an effect similar to piston compression, and thus can significantly increase the oil injection outlet pressure of the oil pump screw 300.

[0052] The oil injection machine of the second aspect of the present invention comprises the above-mentioned oil pump assembly; the oil injection machine of this embodiment is small in size and has a high oil injection outlet pressure, and is suitable for long-distance oil injection scenarios; it has a simple structure, low maintenance cost, and good environmental adaptability; at the same time, since the oil injection machine comprises the above-mentioned oil pump assembly, it has at least all the beneficial effects of the oil pump assembly, which will not be elaborated here.

[0053] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0054] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. An oil pump assembly, characterized in that: include: The oil pump rod assembly is connected to the grease bag at the top and is connected to the oil delivery pipe at the bottom. The oil pump rod assembly pumps the grease in the grease bag out through the oil delivery pipe. The oil pump rod assembly includes an oil pump pipe and an oil pump screw. The oil pump screw is inserted into the oil pump pipe and can slide relative to the oil pump pipe along its own axis. The sliding distance of the oil pump screw is positively correlated with the unit oil injection amount. An intermediate gear is connected to the oil pump screw for driving the oil pump screw to slide along its own axis; An end cover plate is installed on the end of the intermediate gear; the end cover plate is installed with a detection structure, and the detection structure is used to detect the sliding distance of the oil pumping screw. When the oil pumping screw slides to a set position, the detection structure sends a signal to control the intermediate gear to stop moving.

2. The oil pump assembly according to claim 1, characterized in that: The oil pumping screw is connected to a radially protruding oil pumping gear, and the intermediate gear is sleeved on the outer periphery of the oil pumping gear and is transmission connected to the oil pumping gear; the outer side wall of the intermediate gear is connected to a power device that drives it to rotate around its own axis, and the rotation of the intermediate gear around its own axis can drive the oil pumping screw to slide along the direction of its own axis.

3. The oil pump assembly according to claim 2, characterized in that: The detection structure is used to detect the distance between the end cover plate and the oil pump gear.

4. The oil pump assembly according to claim 1, characterized in that: The end cover plates are installed at both ends of the intermediate gear in the length direction.

5. The oil pump assembly according to claim 1, characterized in that: The end cover plate is connected with a limiting structure for fixing its position, and a ball bearing is arranged between the intermediate gear and the end cover plate.

6. The oil pump assembly according to claim 1, characterized in that: A mounting groove is provided on a side of the end cover plate away from the intermediate gear, and the mounting groove is covered with a protective sheet; the detection structure is installed in the mounting groove.

7. The oil pump assembly according to claim 1, characterized in that: The oil delivery pipe is sleeved on the oil pumping screw, and the oil delivery pipe restricts the oil pumping screw from rotating around its own axis.

8. The oil pump assembly according to claim 5, characterized in that: The end of the intermediate gear is provided with a semicircular groove, the end cover plate is provided with an annular groove, and the annular groove corresponds to the semicircular groove; and / or, the end of the intermediate gear is provided with an annular groove, the end cover plate is provided with a semicircular groove, and the annular groove corresponds to the semicircular groove; The ball is installed between the semicircular groove and the annular groove.

9. The oil pump assembly according to claim 1, characterized in that: The grease bag is provided with an oil outlet pipe, the top of the oil pump pipe is penetrated in the oil outlet pipe and is sealedly connected to the oil outlet pipe; the oil pump pipe is provided with a first through hole axially penetrating the oil pump pipe, and a first one-way valve is provided at the top of the first through hole; the top of the oil pump screw is movably penetrated in the oil pump pipe and is sealedly connected to the oil pump pipe; the oil pump screw is provided with a second through hole axially penetrating the oil pump screw, and a second one-way valve is provided at the top of the second through hole; an oil pump cavity is formed between the first one-way valve and the second one-way valve, and the sliding of the oil pump screw relative to the oil pump pipe will drive the volume change of the oil pump cavity, thereby pumping out the grease in the grease bag.

10. An oil injection machine, characterized in that: Comprising an oil pump assembly as claimed in any one of claims 1 to 9.

Images