Feeding device for oil injection gun and electric oil injection gun

Abstract

This utility model discloses a feeding device for an oil injection gun and an electric oil injection gun, belonging to the field of oil injection gun technology. The feeding device includes a barrel, a piston, a pull rod, and an elastic element. The piston has a sealing part, a hollowed-out part, and a deformable part. The sealing part is interference-fitted with the inner circumferential surface of the barrel. The hollowed-out part has a certain depth and is open at the front end and closed at the rear end. The deformable part is located on the outer circumference of the hollowed-out part, and its rear end is connected to the sealing part. The lubricant squeezed into the hollowed-out part expands the deformable part outward so that the deformable part abuts against the inner circumferential surface of the barrel. The electric oil injection gun includes a main unit and the aforementioned feeding device. The added hollowed-out part and deformable part improve the circumferential sealing fit between the piston and the barrel when the feeding device supplies lubricant outward, preventing the lubricant in the barrel from overflowing backward over the piston under large extrusion force, thus improving the user experience.

Description

Technical Field

[0001] This utility model relates to the field of oil injection gun technology, and in particular to a feeding device for an oil injection gun. In addition, this utility model also relates to an electric oil injection gun using such a feeding device. Background Technology

[0002] A grease gun is a tool used to add lubricant to mechanical equipment, widely used in workshops, industries, and auto repair shops. Grease guns are generally equipped with a feeding device. When adding lubricant, the lubricant is first drawn into the feeding device, which is then connected to a pumping device. The pumping device pressurizes the grease and outputs it. The feeding device of a typical grease gun includes a barrel, a piston inside the barrel, a lever for direct user operation, and a spring that biases the piston towards the discharge end. The piston, biased by the spring, forces the lubricant in the barrel towards the discharge end, thus supplying it to the pumping device. To prevent the grease in the barrel from overflowing, an interference fit is generally used between the piston and the barrel. To ensure a leak-proof effect, either the contact area between the piston and the barrel must be increased, or the interference fit must be increased. However, if either of these methods is used, the friction between the piston and the barrel increases significantly. When the user moves the piston backward using the lever, the operation becomes more strenuous, which is detrimental to the user experience. Utility Model Content

[0003] To address the shortcomings and deficiencies in the existing technology, this utility model provides a feeding device for an oil injection gun. By adding a hollowed-out part and a deformable part, the circumferential sealing effect between the piston and the barrel is improved when the feeding device supplies lubricant to the outside, preventing the lubricant in the barrel from overflowing backwards past the piston under a large squeezing force, thus improving the user experience.

[0004] To achieve the above-mentioned technical objectives, the present invention provides a feeding device for an oil injection gun, comprising:

[0005] A container for holding lubricant, having a front open end and a rear closed end;

[0006] A piston, which is located inside the barrel and is used to push the lubricant in the barrel forward;

[0007] A pull rod is mounted on the barrel and its front end is connected to the piston, while its rear end extends out of the barrel and can be operated.

[0008] An elastic element, which is located inside the barrel and is used to bias the piston forward;

[0009] The piston has a sealing part, a hollow part, and a deformable part. The sealing part is press-fitted with the inner circumferential surface of the barrel. The hollow part has a certain depth and is open at the front end and closed at the rear end. The deformable part is located on the outer circumference of the hollow part and its rear end is connected to the sealing part. The lubricant that is squeezed into the hollow part expands the deformable part outward so that the deformable part abuts against the inner circumferential surface of the barrel.

[0010] Preferably, the hollowed-out portion has a ring around the circumference of the piston.

[0011] Preferably, the rear end of the hollowed-out portion extends to the sealing portion.

[0012] Preferably, the thickness of the deformable portion gradually increases from back to front.

[0013] Preferably, the piston further comprises a main body portion, a sealing portion and a deformable portion disposed on the outer periphery of the main body portion, and a hollowed-out portion disposed at least between the main body portion and the deformable portion.

[0014] Preferably, the piston has a recessed cavity that extends from the rear surface forward, the cavity being located on the inner periphery of the hollowed-out portion and separated from the hollowed-out portion.

[0015] Preferably, the concave cavity is provided around the circumference of the piston.

[0016] Preferably, the cavity is provided with a plurality of reinforcing ribs spaced apart along the circumference.

[0017] Preferably, the piston is provided with an axially limiting cover on its rear side, the front end of the pull rod passes through the cover and the piston and is provided with a locking element, and the elastic element is a spring sleeved on the outside of the pull rod. The front end of the spring abuts against the cover and the rear end is positioned. The cover, which is biased by the spring, can abut against the piston.

[0018] This utility model also provides an electric oil gun, including a main unit, a motor and a pumping device inside the main unit, the pumping device having a pump chamber, a plunger driven by the motor and reciprocating relative to the pump chamber, and a material chamber that can communicate with the pump chamber. The electric oil gun also includes the aforementioned feeding device for the oil gun, and the open end of the material cylinder is detachably connected to the material chamber of the pumping device.

[0019] By adopting the above technical solution, this utility model has the following advantages:

[0020] 1. The feeding device for an oil injection gun provided by this utility model has a piston with a sealing part, a hollowed-out part, and a deformable part. The sealing part is interference-fitted with the inner circumferential surface of the barrel. The hollowed-out part extends to a certain depth and is open at the front end and closed at the rear end. The deformable part is located on the outer circumference of the hollowed-out part, and its rear end is connected to the sealing part. The piston, which is biased forward by the elastic element, squeezes the lubricant in the barrel against each other. Under the squeezing action, some of the lubricant enters the hollowed-out part. The lubricant entering the hollowed-out part expands the deformable part outward under the squeezing action. The outwardly expanded deformable part abuts against the inner circumferential surface of the barrel, thereby effectively increasing the circumferential contact area between the piston and the barrel when squeezing the lubricant to the front end. This improves the circumferential sealing fit between the piston and the barrel when the feeding device supplies lubricant outward, and prevents the lubricant in the barrel from overflowing backward over the piston under a large squeezing force. When the user moves the piston backward by pulling the rod, even if there is still lubricant in the barrel, the lubricant in the hollowed-out part is not squeezed, so that the deformable part is in a relaxed state. The relaxed deformable part is not in a tight contact with the inner circumference of the barrel, thereby reducing the friction between the piston and the barrel when moving backward, and thus reducing the difficulty of operation when the user moves the piston backward by pulling the rod, which helps to improve the user experience.

[0021] 2. The hollowed-out part is preferably arranged around the circumference of the piston. The shape of the hollowed-out part is reasonably set so that the deformable part has a circle around the piston. The lubricant that is squeezed into the hollowed-out part can expand the entire deformable part outward, thereby improving the circumferential contact effect between the outer circumferential surface of the piston and the inner circumferential surface of the barrel, thereby further improving the circumferential sealing fit between the piston and the barrel.

[0022] 3. Preferably, the rear end of the hollowed-out section extends to the sealing section. When the piston, under the bias pressure of the elastic element, squeezes the lubricant towards the front end, the lubricant entering the hollowed-out section can also expand the sealing section outward, thereby improving the interference fit between the sealing section and the inner circumference of the barrel. When the user moves the piston backward by pulling the rod, a small amount of lubricant in the hollowed-out section can be squeezed out, and the sealing section can collapse inward under force. This reduces the interference fit between the sealing section and the inner circumference of the barrel, thereby reasonably reducing the friction between the sealing section and the inner circumference of the barrel. This reduces the difficulty of operation when the user moves the piston backward by pulling the rod, which is beneficial to improving the user experience.

[0023] 4. The thickness of the deformable part is preferably increased gradually from back to front. The thickness of the deformable part is reasonably set so that the front end of the deformable part has stronger resilience and ensures the elastic recovery performance of the deformable part. This allows the deformable part to automatically contract inward from the expanded state and squeeze out some lubricant located in the hollowed-out part when the piston moves backward. In this way, the deformable part can basically separate from the inner circumference of the barrel when the piston moves backward, which helps to reduce the friction between the piston and the barrel when moving backward.

[0024] 5. The sealing part and the deformable part are located on the outer periphery of the main body, and the hollowed-out part is located at least between the main body and the deformable part. The specific structure of the piston is reasonably set so that the piston as a whole has sufficient structural strength, so that the piston can smoothly squeeze the lubricant in the barrel forward under the bias pressure of the elastic element. Attached Figure Description

[0025] Figure 1 This is an axial sectional view of the feeding device in Embodiment 1;

[0026] Figure 2 This is a structural diagram of the cylinder cover in Example 1;

[0027] Figure 3 This is a structural diagram of the piston in Example 1;

[0028] Figure 4 This is an axial sectional view of the piston in Example 1;

[0029] Figure 5 This is an axial cross-sectional view of a local structure of the piston in Embodiment 1 when the deformable part is not expanded outwards;

[0030] Figure 6 This is an axial cross-sectional view of a local structure when the deformable part of the piston in Embodiment 1 is expanded outward;

[0031] Figure 7 This is a complete diagram of the electric oil injection gun in Example 1;

[0032] Figure 8 This is a partial structural diagram of the electric oil gun in Example 1;

[0033] Figure 9 This is a structural diagram of the motor and gearbox inside the electric oil gun in Example 1;

[0034] Figure 10 This is a diagram showing the assembly structure of the rolling element, transmission element, and plunger in Example 1;

[0035] Figure 11 This is an axial sectional view of the transmission component and plunger in Embodiment 1;

[0036] Figure 12This is a cross-sectional view of a portion of the structure in Embodiment 1 along the front-to-back direction;

[0037] Figure 13 This is an axial sectional view of the hollowed-out portion in Example 1, when it does not extend to the sealing portion.

[0038] In the diagram, 100-feeding device, 110-barrel, 110A-open end, 110B-closed end, 111-barrel body, 112-barrel cover, 113-through hole, 114-vent hole, 115-limiting hole, 116-inner circumferential surface, 120-piston, 121-sealing part, 122-hollowed-out part, 123-deformable part, 124-main body, 125-center hole, 126-cavity, 127-reinforcing rib, 128-rebound space, 130-pull rod, 131-limiting groove, 132-limiting block, 140-elastic element, 141-spring, 150-handle, 160-stop cover, 170-locking element, 171-washer, 172-nut.

[0039] 200-Lubricant,

[0040] 10-Electric grease gun,

[0041] 300 - Main unit, 310 - Casing, 311 - Handheld unit, 312 - Stand unit, 313 - Base unit

[0042] 410 - Motor, 420 - Gearbox, 421 - Last stage planetary carrier, 422 - Output shaft, 423 - Rotating wheel, 424 - Shaft, 425 - Rolling element, 430 - Transmission component, 431 - Track groove

[0043] 500 - Pumping device; 510 - Pump chamber; 520 - Plunger; 530 - Material chamber; 540 - Embankment; 550 - Pump housing; 551 - Output port; 560 - Check valve; 570 - Exhaust valve.

[0044] 610 - Output pipe, 620 - Connector, 630 - Oil filler nozzle

[0045] 700-battery pack. Detailed Implementation

[0046] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the terms "upper," "lower," "left," "right," "longitudinal," "lateral," "inner," "outer," "vertical," "horizontal," "top," and "bottom," etc., which indicate orientation or positional relationship, are based solely on the orientation or positional relationship shown in the accompanying drawings and are used only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device / component referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0047] Example 1

[0048] Combination Figures 1 to 6 Embodiment 1 provides a feeding device 100 for an oil injection gun, comprising:

[0049] A barrel 110 is used to hold lubricant 200 and has a forward open end 110A and a rearward closed end 110B.

[0050] Piston 120 is disposed inside barrel 110 and is used to expel lubricant 200 inside barrel 110 forward;

[0051] A pull rod 130 is mounted on a feed cylinder 110 and has its front end connected to a piston 120 and its rear end extending out of the feed cylinder 110 and being operable.

[0052] An elastic element 140 is disposed inside the barrel 110 and is used to bias the piston 120 forward.

[0053] The piston 120 is provided with a sealing part 121, a hollow part 122 and a deformable part 123. The sealing part 121 is press-fitted with the inner circumferential surface 116 of the barrel 110. The hollow part 122 has a certain depth and is open at the front end and closed at the rear end. The deformable part 123 is located on the outer circumference of the hollow part 122 and its rear end is connected to the sealing part 121. The lubricant 200 that is squeezed into the hollow part 122 expands the deformable part 123 outward so that the deformable part 123 abuts against the inner circumferential surface 116 of the barrel 110.

[0054] The piston 120, which is biased forward by the elastic element 140, and the lubricant 200 in the barrel 110 are squeezed against each other. Under the squeezing action, part of the lubricant 200 enters the hollowed-out portion 122. The lubricant 200 in the hollowed-out portion 122 expands the deformable portion 123 outward under the squeezing action. The outwardly expanded deformable portion 123 abuts against the inner circumferential surface 116 of the barrel 110, thereby effectively increasing the circumferential contact area between the piston 120 and the barrel 110 when the piston 120 squeezes the lubricant 200 to the front end. This improves the circumferential sealing effect between the piston 120 and the barrel 110 when the feeding device 100 supplies the lubricant 200 outward, and prevents the lubricant 200 in the barrel 110 from overflowing backward over the piston 120 under a large squeezing force. When the user moves the piston 120 backward via the lever 130, even if there is still lubricant 200 in the barrel 110, the lubricant 200 in the hollowed-out portion 122 is not compressed, thus the deformable portion 123 is in a relaxed state. The relaxed deformable portion 123 is not in a tight contact with the inner surface of the barrel 110, thereby reducing the friction between the piston 120 and the barrel 110 as it moves backward. This reduces the difficulty of operation when the user moves the piston 120 backward via the lever 130, which is beneficial to improving the user experience.

[0055] Combination Figure 1 In this embodiment, the feed cylinder 110 includes a cylinder body 111 and a cylinder cover 112. The cylinder body 111 is a hollow cylinder with openings at both ends. The cylinder cover 112 is connected to the rear end of the cylinder body 111 to close the rear end of the feed cylinder 110. Preferably, the cylinder cover 112 is detachably connected to the rear end of the cylinder body 111 through a detachable connection structure such as a threaded fit or a screw-lock fit, making it convenient for the user to disassemble the feeding device 100 for maintenance or cleaning. In this embodiment, the closed end 110B of the feed cylinder 110 does not mean that the rear end of the feed cylinder 110 needs to be completely closed. The closed end 110B only needs to meet the requirement of preventing the piston 120, the pull rod 130, and the elastic element 140 from coming out of the rear end of the feed cylinder 110. A perforated structure can be provided on the cylinder cover 112.

[0056] Combination Figure 2 In this embodiment, the cylinder cover 112 is provided with a through hole 113 that mates with the pull rod 130. The pull rod 130 is mounted on the material cylinder 110 and can move back and forth by mates with the through hole 113. The front end of the pull rod 130 extends into the material cylinder 110 and is connected to the piston 120, while the rear end of the pull rod 130 extends out of the material cylinder 110. To facilitate the user's application of force to the pull rod 130, the rear end of the pull rod 130 is provided with a handle 150 for the user to hold. The user can apply force to the pull rod 130 through the handle 150. In addition, the elastic element 140 is preferably a spring 141. The spring 141 is located inside the material cylinder 110 and sleeved on the outside of the pull rod 130. The spring 141 is in a compressed state. The front end of the spring 141 directly or indirectly abuts against the piston 120, and the rear end of the spring 141 abuts against the cylinder cover 112 for positioning. The compressed spring 141 applies a forward force to the piston 120, thereby biasing the piston 120 forward. Optionally, the handle 150 and the pull rod 130 can be detachably connected together by a threaded connection or other detachable connection structure, or they can be fixedly connected together by welding, interference fit, or other methods.

[0057] When the user applies force to the lever 130 through the handle 150, causing the lever 130 to drive the piston 120 to move backward against the bias of the elastic element 140, in order to avoid the air in the barrel 110 located between the piston 120 and the barrel cover 112 being compressed, resulting in difficult operation, the barrel cover 112 is provided with an air hole 114 for connecting the internal and external air of the closed end 110B. When the lever 130 drives the piston 120 to move backward in the barrel 110, the gas in the closed end 110B can be discharged outward through the air hole 114. To keep the piston 120 in a rearward position, the front of the pull rod 130 is provided with a limiting groove 131, and the cylinder cover 112 is provided with a limiting hole 115 communicating with the through hole 113. When the pull rod 130 drives the piston 120 to move backward until the limiting groove 131 corresponds to the limiting hole 115, the pull rod 130 is tilted toward the limiting hole 115 so that the part of the cylinder cover 112 located on the outer periphery of the limiting hole 115 is inserted into the limiting groove 131. The cooperation between the limiting groove 131 and the cylinder cover 112 makes the pull rod 130 and the piston 120 subject to front-back direction limitation when the spring 141 is further compressed, thereby keeping the piston 120 in a rearward position.

[0058] Combination Figure 4 In this embodiment, the outer diameter of the sealing portion 121 is larger than the inner diameter of the barrel 110, thereby causing the sealing portion 121 to have an interference fit with the inner circumferential surface 116 of the barrel 110. Figure 4 In the diagram, straight lines E1 and E2 represent the axial front and rear dividing lines of the sealing portion 121, respectively. The outer diameter of the piston 120 at these two straight lines is approximately equal to the inner diameter of the barrel 110. The portion of the piston 120 located between straight lines E1 and E2 constitutes the sealing portion 121. Furthermore, the hollowed-out portion 122 preferably has a ring around the circumference of the piston 120, thereby also having a ring around the circumference of the deformable portion 123. The lubricant 200, compressed into the hollowed-out portion 122, can expand the entire ring of deformable portion 123 outwards, thereby improving the circumferential contact effect between the outer circumferential surface of the piston 120 and the inner circumferential surface 116 of the barrel 110, further improving the circumferential sealing fit between the piston 120 and the barrel 110. In an alternative embodiment, the hollowed-out portion 122 can also adopt a non-annular structure, in which case several hollowed-out portions 122 are spaced apart along the circumference of the piston 120.

[0059] In this embodiment, the piston 120 further includes a main body portion 124, a sealing portion 121 and a deformable portion 123 disposed on the outer periphery of the main body portion 124, and a hollowed-out portion 122 disposed at least between the main body portion 124 and the deformable portion 123. Specifically, the rear end of the hollowed-out portion 122 preferably extends rearward to the sealing portion 121. The hollowed-out portion 122 is located on the outer periphery of the main body portion 124 and simultaneously on the inner periphery of the deformable portion 123 and the sealing portion 121. When the piston 120 is biased by the elastic member 140 to squeeze the lubricant 200 towards the front end, the lubricant 200 entering the hollowed-out portion 122 can also expand the sealing portion 121 outward, thereby improving the interference fit effect between the sealing portion 121 and the inner peripheral surface 116 of the barrel 110, and thus improving the circumferential sealing fit effect between the sealing portion 121 and the inner peripheral surface 116 of the barrel 110. When the user moves the piston 120 backward by pulling the rod 130, a small amount of lubricant 200 in the hollowed-out part 122 can be squeezed out, and the sealing part 121 can be compressed inward by the force, thereby reducing the interference fit between the sealing part 121 and the inner circumferential surface 116 of the barrel 110, thus reasonably reducing the friction between the sealing part 121 and the inner circumferential surface 116 of the barrel 110, thereby reducing the difficulty of operation when the user moves the piston 120 backward by pulling the rod 130, which is conducive to improving the user experience. Figure 4 The straight line E3 in the figure represents the axial position of the closed rear end of the hollowed-out part 122. The straight line E3 is located between the straight lines E1 and E2, so that the rear end of the hollowed-out part 122 extends to the sealing part 121.

[0060] In this embodiment, in order to ensure the elastic recovery performance of the deformable part 123, the thickness of the deformable part 123 is preferably gradually increased from back to front, that is, the deformable part 123 is preferably thinner at the back and thicker at the front, so that the front end of the deformable part 123 has stronger elasticity, so that when the piston 120 moves backward, the deformable part 123 can automatically contract inward from the expanded state and squeeze out some lubricant 200 located in the hollowed-out part 122, thereby allowing the deformable part 123 to basically detach from the inner circumferential surface 116 of the barrel 110 when the piston 120 moves backward, which helps to reduce the friction between the piston 120 and the barrel 110 when moving backward. Furthermore, a springback space 128 is formed by slightly indenting the deformable portion 123 towards the center of the piston 120. This springback space 128 can further improve the recovery performance of the deformable portion 123. When the deformable portion 123 is expanded outward by the lubricant 200 entering the hollowed-out portion 122 and comes into contact with the inner circumferential surface 116 of the barrel 110, the springback space 128 disappears. When the piston 120 moves backward and the compression of the lubricant 200 is eliminated, the springback space 128 can help the deformable portion 123 contract inward more quickly.

[0061] In this embodiment, the front end of the deformable portion 123 protrudes forward a certain distance relative to the front surface of the main body portion 124, and the deformable portion 123 gradually approaches the center of the piston 120 from back to front in its original state. To allow the compressed lubricant 200 to smoothly enter the hollowed-out portion 122 and smoothly expand the deformable portion 123 outwards, the hollowed-out portion 122 gradually deviates from the center of the piston 120 from front to back, i.e. Figure 4 The extension direction of the hollowed-out portion 122 shown by the straight line D is offset relative to the center of the piston 120 shown by the straight line C, and there is a certain angle α between them. The angle range of α is preferably set to 15° to 40°. Specifically, α can be set to reasonable sizes such as 15°, 17°, 20°, 22°, 25°, 27°, 30°, 33°, 35°, 37°, and 40°.

[0062] Combination Figure 5 The piston 120 has a central hole 125 on its main body 124 that mates with the front end of the pull rod 130. A cover 160 is fitted onto the pull rod 130 at the rear of the piston 120. The front end of the pull rod 130 passes through the cover 160 and the central hole 125 and is locked by a locking member 170. Specifically, the front end of the pull rod 130 has an external thread. The locking member 170 includes a washer 171 and a nut 172. The washer 171 is located on the front side of the main body 124 of the piston 120. The nut 172 is screwed onto the front end of the pull rod 130 through a threaded engagement, pressing the washer 171 against the main body 124. The outer diameters of both the washer 171 and the nut 172 are smaller than the outer diameter of the main body 124. The piston 120 has a recessed cavity 126 that extends forward from its rear surface. The cover 160 is a bowl-shaped structure with its center protruding rearward. The circumferential edge of the outer ring of the cover 160 can enter the piston 120 from the recessed cavity 126. The cover 160 is preferably made of high-strength materials such as stainless steel to ensure that the spring 141 and the cover 160 exert a biasing force on the piston 120. Under the compression of the lubricant 200, the cover 160 and the piston 120 can move backward a certain distance relative to the pull rod 120. In order to ensure the compression effect of the piston 120 on the lubricant 200, a limiting block 132 is provided at the front of the pull rod 120, located behind the cover 160. The limiting block 132 is used to limit the distance that the cover 160 and the piston 120 can move backward under the compression of the lubricant 200.

[0063] Combination Figure 3 In this embodiment, the cavity 126 preferably has a ring around the circumference of the piston 120. To ensure the strength of the piston 120, the cavity 126 is provided with a plurality of reinforcing ribs 127 spaced apart circumferentially, and the reinforcing ribs 127 extend radially. Furthermore, the cavity 126 is located on the inner circumference of the hollowed-out portion 122, and the cavity 126 and the hollowed-out portion 122 are separated from each other. In other embodiments of this application, the piston 120 may omit the cavity 126.

[0064] Combination Figures 7 to 12 Embodiment 1 also provides an electric oil gun 10, including a main unit 300 and the feeding device 100 described above. The main unit 300 is provided with a motor 410 and a pumping device 500. The pumping device 500 is provided with a pump chamber 510, a plunger 520 driven by the motor 410 and reciprocating relative to the pump chamber 510, and a material chamber 530 that can communicate with the pump chamber 510. The open end 110A of the material cylinder 110 is detachably connected to the material chamber 530 of the pumping device 500.

[0065] Combination Figure 7 , Figure 8 In this example, the main unit 300 includes a housing 310, which preferably adopts a split-shell structure, with the left and right housing parts locked together by fasteners. The housing 310 has an integrally formed or mounted handle portion 311 extending generally in the front-rear direction, allowing the user to hold the main unit 300 or the entire machine via the handle portion 311. The housing 310 also houses a reduction gearbox 420 located between the motor 410 and the pumping device 500. The motor 410 drives the plunger 520 up and down through the reduction gearbox 420. The reduction gearbox 420 and the motor 410 are distributed front-to-back, with their axes generally aligned in the front-rear direction. The shaft of the motor 410 extends into the reduction gearbox 420 as an input shaft, and the reduction gearbox 420 contains at least one stage of planetary gear transmission. Figure 9 , Figure 10 , Figure 11 , Figure 12 The final planetary carrier 421 of the gearbox 420 has an output shaft 422. A rotating wheel 423 is located at the front end of the output shaft 422. An eccentrically positioned column 424 is mounted on the rotating wheel 423. A rolling element 425 is fitted onto the column 424. The rolling element 425 can be a cylindrical component that can rotate freely relative to the column 424, such as a bearing or roller. A transmission element 430 is located on the front side of the rotating wheel 423. The transmission element 430 has a track groove 431 that mates with the rolling element 425. The rolling element 425 is located within the track groove 431. The top end of the plunger 520 is axially limited and connected to the transmission element 430. When the motor 410 drives the column 424 on the rotating wheel 423 to rotate centrifugally via the gearbox 420, the column 424, through the interaction of the rolling element 425 and the track groove 431, drives the transmission element 430 and the plunger 520 to reciprocate up and down. In the specific solution of this embodiment, the output shaft 422 and the rotating wheel 423 can be integrally formed and the shaft post 424 is fixedly inserted into the rotating wheel 423. The output shaft 422, the rotating wheel 423 and the shaft post 424 can also be integrally formed. In addition, the output shaft 422 and the last stage planetary carrier 421 can also be integrally formed. In this case, the rotating wheel 423 can be formed separately and positioned and sleeved on the output shaft 422.

[0066] Combination Figure 12 The pumping device 500 includes a pump housing 550, a plunger 520 mounted on the pump housing 550 that can move vertically, with the lower end of the plunger 520 extending into the pump housing 550, and a pump chamber 510 located within the pump housing 550 and extending substantially vertically. The pump housing 550 has a forward-facing output port 551. The pumping device 500 also includes an output pipe 610, the rear end of which is detachably connected to the pumping device 500 via a connector 620 so that the output pipe 610 can communicate with the output port 551. The front end of the output pipe 610 has a replaceable oil filling nozzle 630. The pumping device 500 has a one-way valve 560 between the pump chamber 510 and the output port 551 to connect or disconnect the two. The one-way valve 560 is a normally closed valve. The pump housing 550 or the gearbox 420 housing has a rim 540 located on the outer periphery of the material chamber 530. The open end 110A of the material cylinder 110 is detachably connected to the rim 540 through a detachable connection structure such as a threaded connection or a screw-lock connection. When the feeding device 100 is installed on the main unit 300, the front end of the material cylinder 110 is connected to the rim 540, thereby connecting the open end 110A to the material chamber 530. When the feeding device 100 is detached from the main unit 300, the front end of the material cylinder 110 separates from the rim 540, thereby separating the open end 110A from the material chamber 530.

[0067] The pump casing 550 is equipped with an exhaust valve 570 that can communicate with the material chamber 530. Air between the feeding device 100 and the pump casing 550 can be discharged outward through the exhaust valve 570, while the lubricant 200 cannot be discharged through the exhaust valve 570.

[0068] To improve the stability of the feeding device 100 when mounted on the main unit 300, the lower part of the housing 310 is provided with a support portion 312 that cooperates with the feeding device 100. The support portion 312 is located below the motor 410 and the gearbox 420. The feeding device 100, mounted on the main unit 300, is inserted into the support portion 312 from back to front and connected to the rim 540. In addition, the housing 310 is also provided with a base portion 313 located below the support portion 312. The base portion 313 provides support for the main unit 300 or the entire machine, allowing the main unit 300 or the entire machine to be stably placed on the ground or a table.

[0069] In this embodiment, the electric oil gun 10 is preferably powered by a battery pack 700, which is preferably detachably mounted on the rear side of the main unit 300. In other embodiments of this embodiment, the electric oil gun 10 may also be powered by connecting to mains electricity via a power cord.

[0070] Other structures of the electric oil gun 10 in this embodiment can refer to existing technologies, such as setting speed regulating components, quantitative oil injection control methods and operating components, triggers for starting and stopping, etc., which will not be described in detail here.

[0071] Combination Figure 5 Spring 141 applies a forward biasing force to piston 120 through cover 160. When there is no lubricant 200 in barrel 110 or the open end 110A of barrel 110 is not connected to the ring edge 540, piston 120 and lubricant 200 are in a state of not pressing each other or the pressing force is very small. At this time, lubricant 200 cannot enter the hollowed-out part 122 under sufficient pressing force, and deformable part 123 located on the outer periphery of hollowed-out part 122 cannot be expanded outward. Deformable part 123 is in a relaxed state and does not tightly contact the inner circumferential surface 116 of barrel 110. At this time, only the sealing part 121 of piston 120 is in an interference fit with the inner circumferential surface 116 of barrel 110. If the user drives piston 120 to move backward through pull rod 130, the friction between piston 120 and barrel 110 is small, which can reduce the difficulty of operation for the user.

[0072] When oiling is required, the feeding device 100 containing lubricant 200 is installed on the main machine 300, and then the machine is started. When the open end 110A of the barrel 110 is connected to the ring edge 640, the open end 110A of the barrel 110 is equivalent to being closed. At this time, the piston 120, which is biased by the spring 141, and the lubricant 200 in the barrel 110 are squeezed against each other and have a certain squeezing force. Under the squeezing action, part of the lubricant 200 in the barrel 110 enters the hollowed-out part 122 of the piston 120, and under the continuous squeezing force, it expands the deformable part 123 of the piston 120 outward. The deformable part 123, which is expanded and deformed, and the barrel 110 are squeezed together. The inner circumferential surface 116 of the piston 120 abuts against the lubricant 200 entering the hollowed-out portion 122, thus maintaining contact and fit between the deformable portion 123 and the inner circumferential surface 116 of the barrel 110. This increases the circumferential contact area between the piston 120 and the barrel 110, thereby improving the circumferential sealing effect between the piston 120 and the barrel 110 when the feeding device 100 supplies lubricant 200 outward. This prevents the lubricant 200 in the barrel 110 from causing the piston 120 to contract and overflow backward under a large compressive force. When the plunger 520 moves upward and disengages from the pump chamber 510, the feed chamber 530 connects with the pump chamber 510, and the lubricant 200 can enter the pump chamber 510 from the feed chamber 530 under the compressive action of the piston 120. When the plunger 520 moves downward into the pump chamber 510, it pushes the lubricant 200 in the pump chamber 510 towards the output port 551. The lubricant pushed towards the output port 551 can be output outward through the output pipe 610, and the output lubricant 200 is injected into the machine through the grease nipple 630. The one-way valve 560 opens when the pressure in the pump chamber 530 reaches a preset pressure value, connecting the pump chamber 530 to the output port 551, and closes when the pressure in the pump chamber 530 is lower than the preset pressure value, isolating the pump chamber 530 from the output port 551.

[0073] Combination Figure 13 In other embodiments of this invention, the rear end of the hollowed-out portion 122 may not extend rearward to the sealing portion 121, i.e. Figure 13 The axial position of the rear end of the hollowed-out portion 122 shown by the straight line E4 is forward relative to or coincides with the straight line E1. At this time, the hollowed-out portion 122 is located only between the main body portion 124 and the deformable portion 123.

[0074] The feeding device 100 described in this embodiment can also be applied to a manual oil gun.

[0075] In addition to the preferred embodiments described above, there are other embodiments of this utility model. Those skilled in the art can make various changes and modifications based on this utility model. As long as they do not depart from the spirit of this utility model, they should all fall within the scope defined in the claims of this utility model.

Claims

1. A feeding device for an oil injection gun, comprising: A container for holding lubricant, having a front open end and a rear closed end; A piston, which is located inside the barrel and is used to push the lubricant inside the barrel forward; A pull rod is mounted on the barrel and its front end is connected to the piston, while its rear end extends out of the barrel and can be operated. An elastic element, which is located inside the barrel and is used to bias the piston forward; The piston is characterized in that it has a sealing part, a hollow part and a deformable part. The sealing part is interference-fitted with the inner circumferential surface of the barrel. The hollow part has a certain depth and is open at the front end and closed at the rear end. The deformable part is located on the outer circumference of the hollow part and its rear end is connected to the sealing part. The lubricant that is squeezed into the hollow part expands the deformable part outward so that the deformable part abuts against the inner circumferential surface of the barrel.

2. A feed device for an oil injection gun according to claim 1, characterized in that The hollowed-out portion has a ring around the circumference of the piston.

3. The feed device for an oil injection gun according to claim 1, wherein The rear end of the hollowed-out section extends to the sealing section.

4. The feed device for an oil injection gun according to claim 1, wherein The thickness of the deformable portion gradually increases from back to front.

5. The feed device for an oil injection gun according to claim 1, wherein The piston also has a main body, a sealing part and a deformable part disposed on the outer periphery of the main body, and a hollowed-out part disposed at least between the main body and the deformable part.

6. The feed device for an oil injection gun according to claim 1, wherein The piston has a recessed cavity that extends from the rear surface forward. The cavity is located on the inner circumference of the hollowed-out portion and is separated from the hollowed-out portion.

7. A feed device for an oil injection gun according to claim 6, characterized in that The concave cavity is provided around the circumference of the piston.

8. The feed device for an oil injection gun according to claim 6, wherein The cavity is provided with several reinforcing ribs that are spaced apart along the circumference.

9. The feed device for an oil injection gun according to claim 1, wherein The piston is provided with an axially limiting cover on its rear side. The front end of the pull rod passes through the cover and the piston and is provided with a locking element. The elastic element is a spring sleeved on the outside of the pull rod. The front end of the spring abuts against the cover and the rear end is positioned. The cover, which is biased by the spring, can abut against the piston.

10. An electric oil injection gun, comprising a main unit, the main unit containing a motor and a pumping device, the pumping device comprising a pump chamber, a plunger driven by the motor and reciprocating relative to the pump chamber, and a material chamber communicatively connected to the pump chamber, characterized in that, The electric oil injection gun also includes the feeding device for the oil injection gun as described in any one of claims 1 to 9, wherein the open end of the material cylinder is detachably connected to the material chamber of the pumping device.

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