A gasket structure for grease gun

Abstract

The utility model discloses a kind of lining plate structures for grease injector, belong to grease injector technical field.It is equipped with lining plate body, oil inlet is equipped on the lining plate body, and internal thread is equipped at oil inlet;Battery compartment is equipped on the lining plate body, battery spring leaf that is integrally formed with lining plate body by insert injection molding is equipped in battery compartment;Battery pressing sheet is equipped on the lining plate body, and battery pressing sheet is detachably connected by pressing sheet screw and embedded nut;The outer periphery of the version of the lining plate body is equipped with injection molding material port.The utility model reduces assembly process through insert injection molding integrally formed battery spring leaf, and embedded nut and pressing sheet screw cooperate to improve connection strength, and injection molding material port is arranged in version outer periphery to improve appearance quality.

Description

Technical Field

[0001] This utility model relates to the field of grease injector technology, and specifically to a liner structure for a grease injector. Background Technology

[0002] Grease injectors, as devices that automatically supply grease to lubrication points, are widely used in the lubrication of industrial equipment. A typical grease injector consists of an upper grease reservoir and a lower drive structure. The liner, serving as the intermediate load-bearing component connecting the grease reservoir and the drive structure, directly affects the reliability and ease of use of the entire assembly.

[0003] Most existing grease injector liners are injection molded from engineering plastics. During production, to ensure the molding accuracy of the internal thread of the oil inlet and to avoid shrinkage distortion caused by uneven wall thickness around the inlet, the injection port is usually located near the oil inlet, and the diameter of the injection port is made relatively large. However, this results in irregular protruding burrs remaining at the injection port location after injection molding. Because of the large diameter of the injection port and its prominent location on the front of the liner, the remaining protrusions are quite large and difficult to remove, requiring secondary processing such as grinding. This increases labor costs and affects the consistency and overall aesthetics of the product appearance.

[0004] Furthermore, the screw holes on the existing backing plate used to fix the battery plates are injection-molded smooth through holes, and are fixed by directly screwing self-tapping screws into the plastic holes. Over time, the repeated screwing in and out of the self-tapping screws can easily wear down the plastic threads due to repeated stress, eventually leading to stripped and loose threads. This can cause the battery plates to fail to be fixed, affecting the reliability of the contact between the battery and the bottom spring plate, and in severe cases, even causing the equipment to lose power.

[0005] Another problem is that the battery spring plates on the existing liner are fixed by sliding insertion, which requires manual assembly. This is difficult to operate, has low assembly efficiency, and is prone to producing defective products due to improper assembly, affecting product consistency and yield.

[0006] Based on the above problems, it is necessary to design a liner structure for the grease injector that can reduce the impact of residual burrs on the appearance of the injection molding, improve the connection strength of the battery pressing sheet, and simplify the assembly process of the battery spring sheet. Utility Model Content

[0007] This invention aims to solve the problems of residual burrs from injection molding affecting the appearance of existing grease injector liners, easy stripping and failure of battery pressure plate screws, and low efficiency of manual assembly of battery spring sheets.

[0008] To solve the above-mentioned technical problems, this utility model provides a liner structure for a grease injector, comprising a liner body with an oil inlet and an internal thread thereon; a battery compartment on the liner body, containing a battery spring sheet integrally formed with the liner body by insert injection molding; a battery pressure plate on the liner body, which is detachably connected to an embedded nut on the liner body by a pressure plate screw; and an injection port on the outer periphery of the liner body.

[0009] Furthermore, the battery pressing plate is a sheet-like structure with a straight groove. The liner body has a rectangular shallow groove for accommodating the battery pressing plate. One end of the battery pressing plate is connected to the embedded nut by a pressing plate screw, and the other end of the battery pressing plate has a triangular protrusion for applying thrust when manually rotating the battery pressing plate.

[0010] Furthermore, a rectangular shallow groove is provided on one side of the battery compartment so that the battery can press down or move aside the battery in the battery compartment when the battery plate rotates.

[0011] Furthermore, the height of the triangular protrusion is no greater than the depth of the rectangular shallow groove.

[0012] Furthermore, the back of the liner body is provided with reinforcing ribs, which consist of a central circular structure and ribs extending outward from the central circular structure.

[0013] Furthermore, the reinforcing ribs consist of four ribs arranged radially, and each rib end is provided with a threaded post for connecting to the drive structure.

[0014] Furthermore, the liner body is provided with an oil outlet docking part, which is a cylindrical structure with a groove along the center of the cylindrical structure.

[0015] Furthermore, the diameter of the injection port is smaller than that of the oil inlet.

[0016] Furthermore, the material of the liner itself is engineering plastic.

[0017] Furthermore, the embedded nut is a round metal nut pre-embedded in the liner body.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The battery spring sheet is integrally molded with the liner body through insert injection molding, reducing the subsequent manual assembly process and improving assembly efficiency and product consistency. The embedded nut is pre-embedded in the liner body, and the pressing screw and the embedded nut are threadedly engaged, avoiding the stripping and loosening of threads caused by directly screwing the self-tapping screw into the plastic hole, thus improving the connection strength and long-term reliability of the battery pressing sheet. The injection port is set on the outer periphery of the liner body, so that the injection residual protrusion is located in an inconspicuous position, reducing the impact on the overall appearance of the liner. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the embodiments will be briefly described below.

[0021] Figure 1 This is a front view of Embodiment 1 of the present utility model;

[0022] Figure 2 for Figure 1 Schematic diagram of the cross section at point A-A;

[0023] Figure 3 This is a rear view of Embodiment 1 of the present invention;

[0024] Figure 4 This is a schematic diagram of the overall structure of the tablet compression device according to Embodiment 2 of this utility model;

[0025] Explanation of reference numerals in the attached figures:

[0026] 1. Liner body; 11. Oil inlet; 12. Battery clamping plate; 121. Embedded nut; 122. Clamping plate screw; 123. Triangular protrusion; 13. Battery compartment; 131. Battery spring plate; 2. Rectangular shallow groove; 3. Reinforcing rib; 4. Threaded post; 5. Oil outlet mating part; 6. Injection port. Detailed Implementation

[0027] This invention provides a liner structure for a grease injector. The technical solution of this invention will be described in detail below through specific embodiments.

[0028] Example 1

[0029] This embodiment provides a liner structure for a grease injector, the overall structure of which is as follows: Figures 1 to 3 As shown in the diagram, this liner structure connects the upper grease pack and the lower drive structure of the grease injector, serving as a load-bearing and connecting element in between.

[0030] The liner structure in this embodiment includes a liner body 1, which is integrally injection molded from engineering plastic. Preferably, the liner body 1 is made of PA66 or PA66+GF (nylon 66 with glass fiber), which has good strength, wear resistance, and dimensional stability. The front of the liner body 1 is used to receive the grease pack, and the back is used to connect the drive structure.

[0031] The liner body 1 is provided with an oil inlet 11, which has an internal thread. The oil inlet 11 is used to connect with the oil outlet of the upper grease pack. The internal thread is tightened to match the external thread of the grease pack's oil outlet, thus achieving a sealed connection between the grease pack and the liner. The lubricating grease in the grease pack enters the internal oil passage of the liner body 1 through the oil inlet 11, and is then transported to the lower drive structure via the oil outlet connection part 5.

[0032] The liner body 1 is provided with a battery compartment 13, which is a cavity structure recessed into the liner body 1 to accommodate the battery. A battery spring piece 131 is provided inside the battery compartment 13. The battery spring piece 131 is a metal conductive spring piece used to contact the bottom of the battery to achieve conductive connection. In this embodiment, the battery spring piece 131 is integrally formed with the liner body 1 through an insert injection molding process. Insert injection molding is a mature injection molding process: after pre-installing a metal insert in the mold, molten resin is injected, and after the resin cools and solidifies, it covers the metal insert to form an integrated product. In this embodiment, the battery spring piece 131 is pre-placed as a metal insert in the corresponding position in the injection mold cavity, and then molten engineering plastic is injected. After cooling and solidification, the battery spring piece 131 is firmly bonded to the liner body 1. This process transforms the original manual post-assembly method of slide-insertion spring piece fixing into a one-time molding process during injection molding, eliminating the need for separate spring piece assembly, reducing assembly steps, improving production efficiency, and avoiding defective products caused by improper manual assembly.

[0033] The liner body 1 is provided with a battery clamping plate 12, which is used to fix the battery in the battery compartment 13. The battery clamping plate 12 is a sheet-like structure with a straight groove, semi-circular ends, a rectangular middle, and an overall oblong shape. The battery clamping plate 12 is preferably made of metal sheet by stamping. The liner body 1 is provided with a rectangular shallow groove 2, the shape of which matches the outer contour of the battery clamping plate 12, and the depth is slightly greater than the thickness of the battery clamping plate 12. It is used to accommodate the battery clamping plate 12, so that the battery clamping plate 12 does not protrude from the surface of the liner body 1 after installation, ensuring the overall flatness of the liner. The rectangular shallow groove 2 is located on one side of the battery compartment 13, close to the edge of the battery compartment 13, so that when the battery clamping plate 12 rotates, its oblong end away from the screw fixing end can cover or move away from the area of ​​the battery compartment 13, thereby pressing or releasing the battery in the battery compartment 13.

[0034] A through hole is provided at one end of the battery pressing plate 12. The pressing plate screw 122 passes through the through hole and is threadedly connected to the embedded nut 121. The embedded nut 121 is pre-embedded in the liner body 1. Specifically, it is a round metal nut that is pre-placed in the mold cavity during the injection molding of the liner body 1. After injection molding, the embedded nut 121 is tightly covered and fixed by the plastic material of the liner body 1. The embedded nut 121 is located at one end of the rectangular shallow groove 2.

[0035] When replacing the battery, loosen the clamping screw 122. The battery clamping plate 12 can then rotate around the screw 122 until it is above the battery compartment 13, opening the compartment. Remove the old battery and insert the new one. Rotate the clamping plate 12 back above the compartment 13 to hold the battery in place. Finally, tighten the screw 122 to secure the clamping plate 12. After the clamping plate 12 holds the battery in place, the bottom of the battery remains in reliable contact with the battery spring plate 131 inside the compartment 13, preventing power loss due to vibration or loosening.

[0036] The back of the liner body 1 is provided with reinforcing ribs 3. The reinforcing ribs 3 enhance the overall structural strength and rigidity of the liner body 1, preventing bending deformation when bearing the weight of the grease pack and the reaction force of the drive structure. The reinforcing ribs 3 consist of a central circular structure and ribs extending outwards from it. The central circular structure is located in the central area of ​​the back of the liner body 1, and there are four ribs evenly distributed radially. Each rib end is provided with a threaded post 4, which is used for fixed connection to the lower drive structure via screws. The reinforcing ribs 3 and threaded posts 4 are integrally injection molded, and metal threaded inserts can be pre-embedded inside the threaded posts 4 to enhance connection strength.

[0037] The liner body 1 is provided with an oil outlet docking part 5, which is used to dock with the oil inlet interface of the lower drive structure. The oil outlet docking part 5 is a cylindrical structure, and a groove is opened along the center of the end face of the cylindrical structure. The groove is used to cooperate and position with the corresponding protrusion of the oil inlet interface of the drive structure, and at the same time plays a role in transmitting torque and preventing relative rotation between the liner and the drive structure.

[0038] The outer periphery of the liner body 1 is provided with a plastic injection port 6, which serves as the feed channel for molten plastic to enter the mold cavity during injection molding. The plastic injection port 6 is located on the outer periphery of the liner body 1, specifically at the edge of the liner, rather than in a prominent area on the front. The diameter of the plastic injection port 6 is smaller than that of the oil inlet 11. This smaller inlet diameter results in a correspondingly smaller size of the residual protrusion after injection molding. By placing the plastic injection port 6 on the outer periphery of the liner body rather than near the oil inlet, the irregular protrusions remaining after injection molding are located in an inconspicuous position on the side of the liner, and their size is reduced due to the smaller diameter. This eliminates the need for secondary grinding to meet appearance requirements, reduces labor costs, and improves product appearance consistency.

[0039] The assembly and operation process of this embodiment is as follows: After the liner body 1 is injection molded, the battery spring plate 131 is integrally embedded in the battery compartment 13, and the embedded nut 121 is pre-embedded at one end of the rectangular shallow groove 2. During assembly, the battery is placed into the battery compartment 13, and the bottom of the battery contacts and conducts with the battery spring plate 131; the battery pressure plate 12 is placed into the rectangular shallow groove 2, so that the through hole is aligned with the embedded nut 121, and the pressure plate screw 122 is screwed in but not tightened; the battery pressure plate 12 is rotated to press the battery, and the pressure plate screw 122 is tightened to complete the battery fixation; the grease outlet is screwed into the internal thread of the inlet 11 to complete the upper connection; the lower drive structure is connected and fixed to the liner body 1 through the threaded post 4 and the outlet docking part 5 to complete the lower connection. When the grease injector is working, the drive structure draws lubricating grease from the internal oil passage of the liner body 1 through the outlet docking part 5, and the grease replenished through the inlet 11 is continuously supplied, and the battery maintains a stable power supply through the battery spring plate 131 and the battery pressure plate 12.

[0040] The other structures and working principles of this embodiment are the same as those of conventional grease injector liners, and will not be described again here.

[0041] Example 2

[0042] This embodiment further optimizes the ease of operation of the battery pressing sheet 12 based on Embodiment 1. The structure of the battery pressing sheet 12 in this embodiment is as follows: Figure 4 As shown.

[0043] In this embodiment, the battery clamping plate 12 has a triangular protrusion 123 on its upper surface at the end away from the clamping screw 122. The triangular protrusion 123 is integrally formed with the battery clamping plate 12. The battery clamping plate 12 has a straight groove shape with opposing long and short sides. The triangular protrusion 123 is a convex ridge structure extending along the long side of the battery clamping plate 12, that is, the axis of the triangular protrusion 123 is parallel to the long side of the battery clamping plate 12. The triangular protrusion 123 has a triangular shape in a cross-section perpendicular to the surface of the battery clamping plate 12, which is manifested as a triangular cross-section convex ridge that gradually narrows upward from the upper surface of the battery clamping plate 12. When viewed from above, the battery clamping plate 12 still has a straight groove shape.

[0044] The triangular protrusion 123 provides a fulcrum for applying force when manually rotating the battery pressure plate 12. The battery pressure plate 12 can be easily rotated with a finger, allowing for battery replacement with one hand without the need for tools, further improving operational convenience. The height of the triangular protrusion 123 is no greater than the depth of the rectangular shallow groove 2, meaning that the top of the triangular protrusion 123 is no higher than the front surface of the liner body 1, ensuring the overall flatness of the liner and not affecting the docking and installation with the upper grease pack.

[0045] In this embodiment, when replacing the battery, after loosening the pressure plate screw 122, push the triangular protrusion 123 with your finger to rotate the battery pressure plate 12 away from the battery compartment 13, making the opening of the battery compartment 13 clear. After removing the old battery and inserting the new battery, push the triangular protrusion 123 again to rotate the battery pressure plate 12 back above the battery compartment 13 to press the battery down. Finally, tighten the pressure plate screw 122 to secure it. The triangular protrusion 123 provides a clear point of force application, which provides a better operating feel and more precise rotation positioning compared to directly pushing the end of the battery pressure plate 12.

[0046] The other structures and working principles of this embodiment are the same as those of Embodiment 1, and will not be repeated here.

[0047] Regarding the connection methods of the components in each embodiment, it should be noted that, in addition to the connection methods explicitly described, the connections between components can be fixed or detachable. Fixed connections include, but are not limited to: integral molding, welding, bonding, riveting, and thermoforming. Detachable connections include, but are not limited to: snap-fit ​​connections, magnetic connections, screw connections, snap-fit ​​connections, and plug-in connections. The specific connection method can be adapted to actual production conditions and usage requirements.

Claims

1. A liner structure for a grease injector, characterized in that, The liner body (1) is provided with an oil inlet (11) and an internal thread at the oil inlet (11); the liner body (1) is provided with a battery compartment (13) and a battery spring plate (131) integrally formed with the liner body (1) by insert injection molding; the liner body (1) is provided with a battery pressure plate (12) and the battery pressure plate (12) is detachably connected to the embedded nut (121) on the liner body (1) by a pressure plate screw (122); the outer periphery of the liner body (1) is provided with a plastic injection port (6).

2. The liner structure for a grease injector according to claim 1, characterized in that, The battery plate (12) is a sheet structure with a straight groove. The liner body (1) has a rectangular shallow groove (2) for accommodating the battery plate (12). One end of the battery plate (12) is connected to the embedded nut (121) through the plate screw (122). The other end of the battery plate (12) has a triangular protrusion (123) for applying a pushing force when the battery plate (12) is manually rotated.

3. The liner structure for a grease injector according to claim 2, characterized in that, A rectangular shallow groove (2) is provided on one side of the battery compartment (13) so that the battery pressing plate (12) can press or release the battery in the battery compartment (13) when it rotates.

4. The liner structure for a grease injector according to claim 2, characterized in that, The height of the triangular protrusion (123) is not greater than the depth of the rectangular shallow groove (2).

5. The liner structure for a grease injector according to claim 1, characterized in that, The back of the liner body (1) is provided with reinforcing ribs (3), which are composed of a central circular structure and ribs extending outward from the central circular structure.

6. The liner structure for a grease injector according to claim 5, characterized in that, The stiffener (3) has four ribs that are radially distributed, and each rib end is provided with a threaded post (4) for connecting the drive structure.

7. The liner structure for a grease injector according to claim 1, characterized in that, The liner body (1) is provided with an oil outlet docking part (5), which is a cylindrical structure with a groove along the center of the cylindrical structure.

8. The liner structure for a grease injector according to claim 1, characterized in that, The diameter of the injection port (6) is smaller than the diameter of the oil inlet (11).

9. The liner structure for a grease injector according to claim 1, characterized in that, The material of the liner body (1) is engineering plastic.

10. The liner structure for a grease injector according to claim 1, characterized in that, The embedded nut (121) is a round metal nut pre-embedded in the liner body (1).

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