Grease injection machine

Abstract

This invention relates to an oil filling machine, comprising a body with an oil inlet at the bottom, an oil pump, a stirring rod, and a power mechanism for driving the pump and stirring rod. At the lower end of the body, a pressing leg is located around the oil inlet, designed to press the grease from the bottom edge of the grease container towards the inner side of the container bottom. The pressing leg is annular in structure. The stirring rod includes a scraper section extending from its outer end to near the inner side of the pressing leg, and the bottom of the scraper section has a scraping part for scraping up the grease from the upper side of the container bottom. This invention solves the technical problem in the prior art where excessive grease remains on the bottom surface of the container after filling, resulting in grease waste.

Description

Technical Field

[0001] This invention relates to grease filling machines in the field of grease filling technology. Background Technology

[0002] Currently, the most common grease containers on the market are 5kg small grease containers and 15kg large grease containers. When using them, an oiling machine is needed to extract the grease from the container and then send it to the designated lubrication location.

[0003] Existing grease filling machines, such as the "Grease Filling Machine and its Filling Pump" disclosed in Chinese Patent CN209484251U, include a machine body with a drive motor and a filling pump mounted on it. The drive motor's power output is connected to a vertically arranged rotating component. The filling pump includes pump cores spaced circumferentially around the rotating component, each pump core including a reciprocating plunger. The rotating component is driven by each plunger to drive its reciprocating movement. An oil inlet is located at the bottom of the machine body, a stirring rod is fixed to the bottom of the rotating component, and support legs are provided on the base around the stirring rod. An annular sealing plate is also provided at the lower end of the base.

[0004] In use, the oil injector is placed into the grease tank from top to bottom. The annular sealing plate seals against the inner wall of the grease tank. The motor drives the rotating parts to rotate, and the stirring rod and plungers move. The movement of the stirring rod is to move the grease and improve the low-temperature performance of the oil injector. On the one hand, the grease is more easily sucked into the plungers, and on the other hand, the oil injector can sink smoothly. The grease is sucked into the plungers through the oil inlet, and then discharged after being pressurized. As the grease decreases, the entire oil injector moves down under the action of gravity. The annular sealing plate ensures that the grease on the inner wall of the grease tank is scraped clean. The existing oil filling machine has the following problems: 1. After refueling, there is a lot of residual grease at the bottom of the grease tank, resulting in low grease utilization. Fuchs 585k grease, most commonly used in wind power, costs approximately 400 yuan / kg. After refueling, about 200g remains in the large grease tank and 50g in the small grease tank, resulting in a waste of about 250g of oil per tank, or about 100 yuan. Research has found that the residual grease is mainly concentrated on the bottom surface of the tank, specifically in the gap between adjacent support legs and on the bottom surface inside the support legs; 2. During the use and storage of grease... During the filling process of the oil filling machine, foreign objects are easily adhering. The grease is contaminated by the foreign objects, which causes the valve core to stick and the one-way valve of the oil filling machine to become stuck, making it unable to work properly. The maintenance of the one-way valve is very inconvenient. 3. The venting operation of the oil filling machine is also very inconvenient. It usually uses a long-handled screw. The screw is removed when putting in and taking out the oil tank. When working, the screw is screwed on. When placed at an angle, the grease is easily shoveled onto the oil pressure plate of the oil filling machine. At the same time, the operation is difficult. The long-handled screw is difficult to operate and requires a large storage and operation space. Summary of the Invention

[0005] The purpose of this invention is to provide an oil filling machine to solve the technical problem in the prior art where a large amount of oil remains on the bottom surface of the container after the oil filling is completed, resulting in oil waste.

[0006] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows:

[0007] A grease filling machine includes a body with an oil inlet at the bottom, a grease pump, a stirring rod, and a power mechanism for driving the grease pump and the stirring rod. The grease filling machine also includes a scraper for contacting and engaging with the inner wall of a grease container. The lower end of the body is provided with an oil-pressing leg located around the oil inlet, which is used to press the grease at the bottom edge of the grease container toward the inner side of the bottom of the grease container. The oil-pressing leg is a ring-shaped support leg. The stirring rod includes a scraper section whose outer end extends to near the inner side of the oil-pressing leg. The bottom of the scraper section has an oil-scraping part for scraping up the grease on the upper side of the bottom of the grease container.

[0008] The ring-shaped support leg is an integral ring-shaped support leg; or the ring-shaped support leg consists of at least two arc-shaped support legs arranged sequentially along the circumference, with adjacent arc-shaped support legs spaced apart; or the ring-shaped support leg is composed of C-shaped support legs.

[0009] The height of the oil scraper is level with the bottom of the oil-pressing outrigger or higher than the bottom of the oil-pressing outrigger.

[0010] The outer diameter of the ring-shaped support leg matches the diameter of the bottom of the grease container.

[0011] The stirring rod also includes an oil-pressing plate section for pushing grease from bottom to top. The scraper section is provided with an oil-pushing structure for guiding and pushing the grease to the oil-pressing plate section. The top of the oil-pressing plate section extends to the oil inlet. The bottom height of the oil-pressing plate section is the same as the height of the scraper section. The oil-pressing plate section is provided with drag-reducing holes.

[0012] The pressure plate section includes a guide plate and a pressure plate arranged vertically, and drag reduction holes are opened on the pressure plate. The guide plate and the pressure plate are formed by bending a single plate.

[0013] The scraper section and the oil pressure plate section are located on both sides of the rotation axis of the stirring rod.

[0014] The oil scraper edge is an elastic oil scraper edge that is turned outward at the upper end of the oil-pressing support leg, and the upper end of the oil-pressing support leg has a connecting flange for connecting with the machine body.

[0015] The oil pressure plate is composed of an oil pressure support leg, an elastic oil scraper edge, and a connecting flange. The oil pressure plate is mounted on the machine body and can move up and down. The machine body is provided with a limiting structure that restricts the up and down movement range of the oil pressure plate. The inner side of the oil pressure plate is provided with an oil pressure plate anti-rotation connection structure. The machine body is provided with a machine body anti-rotation connection structure that cooperates with the oil pressure plate anti-rotation connection structure.

[0016] The connecting flange and oil-pressing support leg include an elastic body integrally formed with the elastic scraper flange and a metal frame embedded and fixed inside the elastic body.

[0017] The lower end of the machine body has multiple machine body legs arranged circumferentially. The opposite side walls of two adjacent machine body legs constitute the anti-rotation connection structure of the machine body. The anti-rotation connection structure of the pressure plate includes an anti-rotation stop edge for extending into the space between two corresponding machine body legs. The two sides of the anti-rotation stop edge are in circumferential stop engagement with the opposite side walls of the two corresponding machine body legs.

[0018] The machine body includes an upper part and a lower part arranged vertically, forming a ⊥-shaped structure. The fuel pump is located on the lower part of the machine body. A one-way valve is installed on the fuel pump's oil outlet line. The one-way valve includes a valve seat and a valve core that can move vertically. The valve seat is located on the lower part of the machine body. The upper end of the lower part of the machine body is threadedly connected to a valve core mounting seat with an axis extending in the vertical direction. The valve core is mounted on the valve core mounting seat by a spring.

[0019] The grease injection machine also includes an exhaust valve, which includes an exhaust operating rod whose rotation axis extends vertically and is rotatably mounted on the machine body. An exhaust hole is provided on the machine body next to the oil inlet. An exhaust valve rod is fixed on the exhaust operating rod and is eccentrically arranged with the exhaust operating rod. An exhaust valve baffle is fixed at the bottom of the exhaust valve rod. The exhaust valve baffle has a blocking position for blocking the exhaust hole and an exhaust position for opening the exhaust hole during the swinging process of the exhaust valve rod.

[0020] The beneficial effects of the present invention are as follows: The oil pressing leg in the present invention is a ring-shaped structure leg, so as to press as much grease as possible from the bottom edge of the barrel to the inner side of the bottom of the grease barrel. The outer end of the scraper section extends to a position close to the inner side of the oil pressing leg. The scraping part at the bottom of the scraper section can contact the bottom of the grease barrel and scrape up all the grease on the inner side of the bottom surface of the barrel, thus avoiding the retention of grease on the bottom surface of the barrel.

[0021] Furthermore, the oil-pushing structure on the connecting rod section pushes the grease to the pressure plate section. The grease is pushed from bottom to top to the oil inlet via the pressure plate section. Since the bottom of the pressure plate section is relatively low, the overall height of the pressure plate section is relatively high. Without the drag-reducing hole, the pressure plate section would experience greater oil resistance when rotating, resulting in higher energy consumption requirements for the power mechanism. The drag-reducing hole reduces the energy consumption requirements of the power mechanism when the agitator rotates. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of one embodiment of the present invention;

[0023] Figure 2 yes Figure 1 A bottom view;

[0024] Figure 3 yes Figure 1 A three-dimensional image;

[0025] Figure 4 yes Figure 1 Schematic diagram of the intermediate pressure oil pan;

[0026] Figure 5 yes Figure 4 Top view;

[0027] Figure 6 yes Figure 4 A three-dimensional image;

[0028] Figure 7 yes Figure 1 Schematic diagram of the middle stirring rod;

[0029] Figure 8 yes Figure 7 A three-dimensional image;

[0030] Figure 9 yes Figure 7 Schematic diagram of the fit between the medium-pressure oil plate and the guide plate;

[0031] Figure 10 Figure 1 A schematic diagram showing the assembly of the electric motor, drive shaft, fuel pump, and agitator.

[0032] Figure 11 yes Figure 10 Enlarged view of point A in the image;

[0033] Figure 12 yes Figure 1 A schematic diagram showing the connection between the exhaust control lever and the exhaust valve lever;

[0034] Figure 13 This is a schematic diagram showing the state when the vent is open. Detailed Implementation

[0035] An embodiment of a grease injection machine, for example Figures 1-13As shown: The machine body includes an oil inlet 11 at the bottom, and is equipped with an oil pump, a stirring rod 12, and a power mechanism for driving the oil pump and stirring rod. In this embodiment, the machine body includes an upper part 3 and a lower part 9 arranged vertically, forming a ⊥-shaped structure. The power mechanism includes a motor 27 disposed in the upper part of the machine body, and the oil pump is a plunger pump disposed in the lower part of the machine body. The power output end of the motor is connected to a drive shaft 31 whose rotation axis extends vertically. The stirring rod 12 is detachably fixed to the bottom of the drive shaft 31 by screws 36. The fuel pump includes multiple plunger chambers 33 arranged around the outer periphery of the drive shaft. The plunger chambers 33 are connected to the oil inlet 11. Each plunger chamber 33 is equipped with a plunger 34 that is connected to the drive shaft. During the rotation of the drive shaft 31, the corresponding plunger 34 can be driven to reciprocate in the plunger chamber 33, thereby realizing the oil pumping action. The fuel pump and the connection between the fuel pump and the drive shaft are existing technologies and will not be described in detail here.

[0036] The lower part of the machine body includes machine body support legs 16, each including four support legs spaced circumferentially. An oil pressure plate 5 is mounted on the machine body support legs 16, moving vertically. The oil pressure plate 5 includes an oil pressure leg 6 located outside the oil inlet 11, used to press the grease at the bottom edge of the grease container towards the inside of the grease container bottom. The oil pressure leg 6 is located on the outside of the machine body support legs 16. The oil pressure plate also includes an elastic oil scraper 4, which is turned outwards at the upper end of the oil pressure leg and used to seal against the inner wall of the grease container. The elastic oil scraper 4 forms a sealing surface by elastic deformation upon contact with the inner wall of the grease container. The oil pressure plate also includes a connecting flange 17, which is turned inwards at the upper end of the oil pressure leg and used to connect with the machine body. An anti-rotation connection structure for the oil pressure plate is provided on the connecting flange. The opposite sidewalls of two adjacent machine body support legs constitute an anti-rotation connection structure for the machine body to engage with the anti-rotation connection structure of the oil pressure plate. In this embodiment, the anti-rotation connection structure of the oil pressure plate includes an anti-rotation stop 15 disposed on the inner side of the connecting flange for extending between two adjacent machine body legs. The two sides of the anti-rotation stop 15 are engaged with the opposite sidewalls of the two connected machine body legs in the circumferential direction to achieve the anti-rotation connection between the oil pressure plate and the machine body.

[0037] The connecting flange 17 and the oil pressure support leg 6 include an elastic body integrally formed with the elastic scraper flange 4 and a metal frame 40 embedded and fixed inside the elastic body. The elastic body is made of rubber. A limit screw 8 is radially threaded onto the lower side of the connecting flange on the support leg. The lower part of the base also includes a stop flange 30 located above the connecting flange. The stop flange 30 is formed by the bottom of the base cylinder. The limit screw and the stop flange constitute a limiting structure that restricts the vertical movement range of the oil pressure plate. The connecting flange 17 can move vertically between the stop flange 30 and the limit screw 8. In this embodiment, the annular support leg consists of four arc-shaped support legs arranged sequentially along the circumference. Adjacent arc-shaped support legs are spaced apart, and the distance between adjacent arc-shaped support legs forms a process channel. A screwdriver passes radially through this process channel to tighten the limiting screw 8, thereby enabling the installation and removal of the oil pressure plate 5. Therefore, based on the screwdriver's passage size, the distance between adjacent arc-shaped support legs should be as small as possible, ensuring that the arc-shaped support legs together still form an annular support leg structure. In this embodiment, the distance between adjacent arc-shaped support legs is 8mm. When the motor operates, the stirring rod 12 rotates accordingly. Due to the relatively high resistance of the grease, the motor experiences a relatively large reaction force. The elastic scraper edge 4 of the oil pressure plate 5 is deformed by the inner wall of the grease container, resulting in sufficient friction between the elastic scraper edge and the grease container. The oil pressure plate is fixed relative to the grease container. The reaction force of the motor housing is transmitted to the oil pressure plate through the machine body support legs and then to the grease container through the elastic scraper edge of the oil pressure plate, thus preventing the motor from reversing.

[0038] The stirring rod 12 includes a scraper section 13 and an oil-pressing plate section 14 located on both sides of the stirring rod rotation axis. The scraper section 13 is longer than the oil-pressing plate section. The outer end of the scraper section 13 extends to the inner side near the oil-pressing support leg 6, so that it can cover all the bottom areas of the grease tank as much as possible in the radial direction. The bottom of the scraper section 13 has an oil-scraping part 22 for scraping the grease on the upper side of the bottom of the grease tank. In this embodiment, since the bottom of the grease tank is a flat structure, the height of the oil-scraping part 22 is the same as the bottom height of the oil-pressing support leg 6. So when the oil-pressing support leg 6 contacts the bottom of the tank, the oil-scraping part 22 also contacts the bottom of the tank, thereby scraping the grease on the upper side of the bottom of the tank. The oil pressure plate section 14 is used to push the grease from bottom to top. The top of the oil pressure plate section extends to the oil inlet 11. The bottom height of the oil pressure plate section 14 is the same as the height of the oil scraper section 22. The oil pressure plate section 14 includes a guide plate 25 and an oil pressure plate 20 arranged vertically. The oil pressure plate 20 is provided with a drag-reducing hole 21. The guide plate 25 and the oil pressure plate 20 are formed by bending a single plate. The oil pressure plate is arranged at an angle, and the guide plate is arranged horizontally. This ensures the structural strength of the oil pressure plate section and also allows the guide plate to guide the grease evenly to the oil inlet, increasing the oil suction time and preventing cavitation.

[0039] The scraper section 13 is provided with an oil-pushing structure for guiding and pushing grease to the pressure plate section. In this embodiment, the oil-pushing structure consists of an inclined hanging rod oil-pushing plate 23 provided on the scraper section. An oil-pressing and pushing plate 26 is provided at the outer end of the pressure plate 20. A bolt hole 24 is provided on the stirring rod in the area between the scraper section and the pressure plate section. The stirring rod 12 is detachably fixed to the lower end of the drive shaft by inserting fixing screws 36 through the bolt holes 24.

[0040] Each plunger of the fuel pump is equipped with a check valve 32 on its oil outlet path. The check valve 32 includes a valve seat and a vertically movable valve core 39. The valve seat is located on the lower part 9 of the pump body. A valve core mounting seat 37, with its axis extending vertically, is threadedly connected to the upper end of the lower part 9. The valve core 39 is spring-loaded onto the valve core mounting seat 37. This allows for easy removal of the valve core mounting seat, spring, and valve core when the check valve becomes clogged and malfunctions.

[0041] The grease injection machine also includes an exhaust valve, which comprises an exhaust operating rod 1 rotatably mounted on the machine body with its rotation axis extending vertically. An exhaust port 42 is provided on the machine body next to the oil inlet. An exhaust valve rod 10, eccentrically arranged with the exhaust operating rod 1, is fixed to the exhaust operating rod 1. An exhaust valve baffle 9 is fixed to the bottom of the exhaust valve rod 10. The exhaust valve baffle 9 has a blocking position for sealing the exhaust port 42 and an exhaust position for opening the exhaust port 42 during the swinging motion of the exhaust valve rod. When no venting operation is required, such as... Figure 2 As shown, the exhaust valve baffle blocks the exhaust port 42; when an exhaust operation is required, such as Figure 13 As shown, the operator only needs to rotate the exhaust control lever 1, and the exhaust valve rod 10, along with the exhaust valve baffle 9, will rotate to the exhaust position. At this time, the exhaust port will open, and normal exhaust can be performed. The exhaust operation is simple and convenient.

[0042] In use, the grease injector of this invention selects an appropriate size pressure plate and agitator rod according to the grease container, ensuring that the elastic scraper can scrape oil from the inner wall of the grease container. The outer diameter of the pressure leg matches the outer diameter of the bottom of the grease container, and the scraping part of the scraper rod can contact the bottom of the grease container to scrape oil. The lower part of the grease injector body is placed in the grease container. The motor drives the oil pump and agitator rod through the drive shaft. Before reaching the bottom of the grease container, the main function of the agitator rod is to move the grease, improve its fluidity, reduce the resistance of the grease to the injector, and ensure that the grease injector can sink smoothly. Simultaneously, it pushes the grease to the inlet to ensure smooth oil intake, improves the low-temperature oil injection performance of this grease injector, and avoids cavitation. As the oil suction is about to end, the pressure plate support legs are placed on the bottom of the grease tank. By gravity, the pressure plate support legs press the grease at the bottom edge of the grease tank towards the inside of the tank bottom. Under the action of the scraper section of the stirring rod, the grease on the inside and top surface of the tank bottom can be smoothly scraped up and pressed towards the oil inlet by the pressure plate section, reducing the amount of residual oil at the bottom of the grease tank and preventing grease waste.

[0043] In other embodiments of the present invention: the tightening of the limiting screw can also be achieved using a hexagonal wrench with an angle, in which case it is not necessary to reserve a process channel on the hydraulic support leg, and the annular structure support leg is an integral annular support leg; of course, when a process channel is required, the annular structure support leg can also be an integral annular support leg, for example, the process channel is formed by a radial through hole opened on the annular structure support leg, in use, the screwdriver passes directly through the radial direction to complete the tightening of the limiting screw; the spacing between adjacent arc-shaped support legs should be as small as possible according to the screwdriver's passage size, such as 7mm, 11mm, 12mm, etc.; of course, the annular structure support leg can also be composed of C-shaped support legs, C The width of the notch at the outrigger should be as small as possible to make the entire outrigger a ring-shaped structure; the hanging rod section and the pressure plate section can also be located on the same side of the rotating axis of the agitator; the hanging rod push plate on the scraper section can also be replaced by other push structures, for example, the scraper section itself can be set as an arc structure, in which case the arc plate surface of the scraper section can form a push structure; the sealing surface can also be a conical sealing surface; the valve core of the one-way valve can also be a steel ball structure; an exhaust valve or a one-way exhaust diaphragm can also be installed on the pressure plate; the power mechanism can also be a hydraulic motor or a pneumatic motor; the number of machine body supports can also be set as needed, such as two, three or other numbers; the pressure plate can also be fixed to the machine body, in which case the pressure plate can be directly fixed to the machine body; the pressure plate support connection structure can also be... It refers to the support edge that extends between adjacent machine body legs. For example, the machine body has a key bar extending vertically, and the oil pressure plate has a keyway that guides and moves vertically with the key bar. The keyway constitutes the anti-rotation connection structure of the oil pressure plate, and the key bar constitutes the anti-rotation connection structure of the machine body. The oil pressure plate is installed into the machine body from bottom to top, and the keyway and key bar guide and cooperate. During operation, the key bar and keyway can achieve the anti-rotation connection between the oil pressure plate and the machine body. Alternatively, an anti-rotation groove can be set on the machine body, and an anti-rotation screw with its inner side extending into the anti-rotation groove can be radially screwed on the oil pressure plate. The anti-rotation connection between the oil pressure plate and the machine body is achieved through the cooperation of the anti-rotation groove and the anti-rotation screw. In this case, the anti-rotation screw constitutes the anti-rotation connection structure of the oil pressure plate, and the anti-rotation groove constitutes the anti-rotation connection structure of the machine body. The height of the oil scraper can also be higher than the bottom height of the oil pressure leg.

Claims

1. A grease injector, comprising a body with an oil inlet at the bottom, and further comprising a grease pump, a stirring rod, and a power mechanism for driving the grease pump and the stirring rod, the grease injector also comprising a scraper for contacting and engaging with the inner wall of a grease container, characterized in that: The oil scraper edge is an elastic oil scraper edge that is turned outward at the upper end of the oil-pressing leg. The upper end of the oil-pressing leg has an inwardly turned connecting flange for connection with the machine body. The oil-pressing leg, the elastic oil scraper edge, and the connecting flange constitute an oil-pressing plate. The oil-pressing plate is mounted on the machine body and can move up and down. The lower end of the machine body is provided with an oil-pressing leg located around the oil inlet for pressing the grease at the bottom edge of the grease tank towards the inner side of the bottom of the grease tank. The oil-pressing leg is a ring-shaped support leg. The stirring rod includes a scraper section whose outer end extends to near the inner side of the oil-pressing leg. The bottom has an oil scraper for scraping up the grease from the bottom of the grease tank. The height of the oil scraper is flush with the bottom of the oil pressing leg. The outer diameter of the annular support leg matches the diameter of the bottom of the grease tank. The annular support leg consists of at least two arc-shaped support legs arranged sequentially along the circumference. The two adjacent arc-shaped support legs are spaced apart. The distance between the two adjacent arc-shaped support legs is used to form a process channel. A screwdriver is adapted to pass through the process channel radially to tighten the limit screw, thereby realizing the installation and removal of the oil pressing plate.

2. The grease injection machine according to claim 1, characterized in that: The stirring rod also includes an oil-pressing plate section for pushing grease from bottom to top. The scraper section is provided with an oil-pushing structure for guiding and pushing the grease to the oil-pressing plate section. The top of the oil-pressing plate section extends to the oil inlet. The bottom height of the oil-pressing plate section is the same as the height of the scraper section. The oil-pressing plate section is provided with drag-reducing holes.

3. The grease injection machine according to claim 2, characterized in that: The pressure plate section includes a guide plate and a pressure plate arranged vertically, and drag reduction holes are opened on the pressure plate. The guide plate and the pressure plate are formed by bending a single plate.

4. The grease injection machine according to claim 2, characterized in that: The scraper section and the oil pressure plate section are located on both sides of the rotation axis of the stirring rod.

5. The grease injection machine according to claim 1, characterized in that: The machine body is provided with a limiting structure that restricts the vertical movement range of the pressure plate, the inner side of the pressure plate is provided with a pressure plate anti-rotation connection structure, and the machine body is provided with a machine body anti-rotation connection structure that cooperates with the pressure plate anti-rotation connection structure.

6. The grease injection machine according to claim 1, characterized in that: The connecting flange and oil-pressing support leg include an elastic body integrally formed with the elastic scraper flange and a metal frame embedded and fixed inside the elastic body.

7. The grease injection machine according to claim 1, characterized in that: The lower end of the machine body has multiple machine body legs arranged circumferentially. The opposite side walls of two adjacent machine body legs constitute the anti-rotation connection structure of the machine body. The anti-rotation connection structure of the pressure plate includes an anti-rotation stop edge for extending into the space between two corresponding machine body legs. The two sides of the anti-rotation stop edge are in circumferential stop engagement with the opposite side walls of the two corresponding machine body legs.

8. The grease injection machine according to any one of claims 1 to 4, characterized in that: The machine body includes an upper part and a lower part arranged vertically, forming a ⊥-shaped structure. The fuel pump is located on the lower part of the machine body. A one-way valve is installed on the fuel pump's oil outlet line. The one-way valve includes a valve seat and a valve core that can move vertically. The valve seat is located on the lower part of the machine body. The upper end of the lower part of the machine body is threadedly connected to a valve core mounting seat with an axis extending in the vertical direction. The valve core is mounted on the valve core mounting seat by a spring.

9. The grease injection machine according to any one of claims 1 to 4, characterized in that: The grease injection machine also includes an exhaust valve, which includes an exhaust operating rod whose rotation axis extends vertically and is rotatably mounted on the machine body. An exhaust hole is provided on the machine body next to the oil inlet. An exhaust valve rod is fixed on the exhaust operating rod and is eccentrically arranged with the exhaust operating rod. An exhaust valve baffle is fixed at the bottom of the exhaust valve rod. The exhaust valve baffle has a blocking position for blocking the exhaust hole and an exhaust position for opening the exhaust hole during the swinging process of the exhaust valve rod.

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