A post-maintenance device for a construction machinery rental equipment

Abstract

The utility model discloses a kind of building engineering machinery leasing equipment's later maintenance device, it is related to mechanical repair technical field, including oil storage cylinder, oil storage cylinder cross section is circular, cylinder cover is threadedly connected at one end of oil storage cylinder, the edge of the side of cylinder cover away from oil storage cylinder is equipped with oil outlet nozzle, internal thread sleeve is inserted in oil outlet nozzle, internal thread sleeve is connected with oil outlet nozzle by connecting piece, and thin steel pipe one end is threadedly connected in internal thread sleeve. Without replacing entire cylinder cover, greatly reduce the cost expenditure of spare part replacement.

Description

Technical Field

[0001] This utility model relates to the field of mechanical maintenance technology, specifically a post-maintenance device for construction machinery rental equipment. Background Technology

[0002] In the post-maintenance of construction machinery rental equipment, regularly applying grease to moving parts such as bearings, gears, and chains is a crucial step in reducing mechanical wear. The grease gun, as an important tool for applying grease, directly impacts the efficiency and cost of maintenance operations due to the connection methods of its various components. Grease guns using seamless steel pipes as the oil outlet, with their high rigidity and excellent pressure resistance, excel in connecting to concealed and narrow lubrication points, accurately delivering grease to the areas requiring lubrication.

[0003] This type of thin steel tube is typically fixed to the grease nozzle on the grease gun barrel cap using a threaded connection: the inner wall of the nozzle is machined with internal threads, while the end of the thin steel tube is correspondingly machined with external threads. The interlocking of these threads achieves a tight connection. However, this connection method has significant drawbacks in actual, frequent use. During equipment maintenance, the thin steel tube needs to be frequently disassembled and reassembled according to different lubrication points. Each disassembly and reassembly causes friction between the threads inside the nozzle and the threads at the end of the thin steel tube. Over time, the threads on the inner wall of the nozzle are easily damaged due to wear, impacts, etc., resulting in thread deformation, stripping, etc. Once the threads are damaged, the nozzle can no longer achieve an effective sealing connection with the thin steel tube. This not only causes grease leakage during filling, affecting lubrication, but may also cause the thin steel tube to wobble during operation due to a loose connection, causing inconvenience.

[0004] More importantly, the oil outlet is integrated into the cylinder cover. When the threads inside the oil outlet are damaged, the oil outlet cannot be replaced separately; the entire cylinder cover must be replaced. This undoubtedly increases the cost of replacing parts, especially in cost-sensitive scenarios such as the maintenance of construction machinery rental equipment. Frequent cylinder cover replacements can accumulate into a considerable expense, indirectly increasing the equipment's maintenance costs. Furthermore, the process of replacing the cylinder cover also consumes some work time, affecting the overall progress of the maintenance work. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a post-maintenance device for construction machinery rental equipment, which solves the problem that heat transfer is hindered due to direct contact between the bottom of the tomato sauce can and the device, easily leading to incomplete sterilization.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a post-construction machinery rental equipment maintenance device, comprising: The oil storage tank has a circular cross-section; A cylinder cover is threadedly connected to one end of an oil reservoir, and an oil outlet is installed on the edge of the cylinder cover facing away from the oil reservoir. An internally threaded sleeve is inserted into the oil outlet nozzle, and the internally threaded sleeve is connected to the oil outlet nozzle through a connector; A thin steel pipe, with one end threaded into an internal threaded sleeve.

[0007] Preferably, the connector includes: Three ear plates are provided, and the three ear plates are installed in a ring at equal intervals at one end of the internal threaded sleeve located outside the oil outlet. A small hole is opened on one side of each ear plate. A ring is fitted onto the oil outlet and connected and fixed to the oil outlet. One side of the ring has three circular holes that are equally spaced and match the small holes. A screw is inserted into the channel formed by the small hole and the round hole. One end of the screw is threaded with a nut, which is located on the side of the ring away from the ear plate.

[0008] Preferably, an L-shaped plate is provided on the side of the small hole away from the ring, and a through hole is opened on the side of the L-shaped plate facing the small hole. The through hole and the small hole are arranged concentrically. The end of the L-shaped plate away from the through hole is connected and fixed to the end of the ear plate near the internal threaded sleeve. The screw passes through the channel formed by the through hole, the small hole and the round hole.

[0009] Preferably, the outer surface of the internal threaded sleeve is provided with a plurality of insertion slots in an annular shape at equal intervals. The insertion slots are arranged along the length direction of the internal threaded sleeve. Insertion strips are inserted into the insertion slots and the insertion strips are fixed to the inner wall of the oil outlet.

[0010] Preferably, a sealing ring is installed at one end of the internal threaded sleeve inside the oil outlet, and the sealing ring is in contact with the inner wall of the oil outlet.

[0011] Preferably, the end of the thin steel tube away from the oil outlet is threadedly connected to a connecting sleeve with an internal thread on its inner surface, and the end of the connecting sleeve away from the thin steel tube is fitted with a mating sleeve for connecting to the oil injection hole. The inner surface of the mating sleeve is machined with an internal thread, and the end of the mating sleeve near the connecting sleeve is fitted with a hexahedron that is connected and fixed to the mating sleeve.

[0012] Preferably, a connecting arm is rotatably connected to the middle of the side of the cylinder cover away from the oil reservoir. A pressure handle is rotatably connected to the end of the connecting arm away from the cylinder cover. A piston rod is rotatably installed at the end of the pressure handle near the cylinder cover. A piston chamber communicating with the oil reservoir and the oil outlet is installed on the outer surface of the cylinder cover. The end of the piston rod away from the pressure handle is inserted into the piston chamber.

[0013] Compared with the prior art, the present invention provides a method with the following beneficial effects: 1. By setting an independently replaceable internal threaded sleeve to replace the traditional oil outlet thread structure integrated with the cylinder cover, when the internal thread inside the internal threaded sleeve is damaged due to frequent disassembly and assembly, only the internal threaded sleeve needs to be replaced, without replacing the entire cylinder cover, which greatly reduces the cost of replacing parts.

[0014] 2. After the screw passes through the L-shaped plate, ear plate and ring, connect the nut with the thread to complete the assembly of the internal thread sleeve and the oil outlet. Due to the restriction of the L-shaped plate, part of the screw is exposed, which provides space for the screw to be cut off later. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the structure of this utility model from another perspective; Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 4 This is an exploded structural diagram of the fine steel pipe, cylinder cover, and oil storage cylinder of this utility model; Figure 5 for Figure 4 Enlarged view of section B in the middle.

[0016] In the picture: 1. Oil storage tank; 2. Cylinder cap; 21. Oil outlet; 22. Connecting arm; 23. Pressure handle; 24. Piston rod; 25. Piston chamber; 26. Ring; 27. Round hole; 28. Insertion strip; 3. Thin steel pipe; 31. Butt sleeve; 32. Hexahedron; 33. Connecting sleeve; 4. Screw; 41. Nut; 5. Sealing ring; 6. Internal threaded sleeve; 61. Insertion groove; 62. Ear plate; 63. Small hole; 64. Through hole; 65. L-shaped plate. Detailed Implementation

[0017] In this utility model, unless otherwise stated, the orientations used, such as "up" and "down", usually refer to the direction shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0018] This utility model provides a technical solution: Please see Figures 1-5A post-maintenance device for construction machinery rental equipment includes an oil reservoir 1 with a circular cross-section, a reservoir cover 2 threadedly connected to one end of the oil reservoir 1, an oil outlet 21 installed on the edge of the side of the reservoir cover 2 facing away from the oil reservoir 1, a connecting arm 22 rotatably connected to the middle of the side of the reservoir cover 2 facing away from the oil reservoir 1, a pressure handle 23 rotatably connected to the end of the connecting arm 22 away from the reservoir cover 2, a piston rod 24 rotatably installed at the end of the pressure handle 23 near the reservoir cover 2, a piston chamber 25 communicating with the oil reservoir 1 and the oil outlet 21 installed on the outer surface of the reservoir cover 2, the end of the piston rod 24 away from the pressure handle 23 inserted into the piston chamber 25, the middle of the side of the reservoir cover 2 facing away from the oil reservoir 1 rotatably connected to the pressure handle 23 via the connecting arm 22, the end of the pressure handle 23 near the reservoir cover 2 rotatably installed with the piston rod 24, and the other end of the piston rod 24 inserted into the piston chamber 25 communicating with the oil reservoir 1 and the oil outlet 21. The end of the thin steel pipe 3 furthest from the oil outlet 21 is threaded with a connecting sleeve 33 whose inner surface is machined with internal threads. The end of the connecting sleeve 33 furthest from the thin steel pipe 3 is fitted with a mating sleeve 31 for connecting the oil injection hole. The inner surface of the mating sleeve 31 is machined with internal threads. The end of the mating sleeve 31 near the connecting sleeve 33 is fitted with a hexahedron 32 that is connected and fixed to the mating sleeve 31. When the pressure handle 23 is manually turned, the pressure handle 23 rotates around the connecting arm 22, driving the piston rod 24 to reciprocate in the piston chamber 25. When the pressure handle 23 is pressed, the piston rod 24 is pushed into the piston chamber 25, compressing the internal space and pushing the grease in the oil reservoir 1 toward the oil outlet 21. When the pressure handle 23 is released, the piston rod 24 returns to its original position, and the grease in the oil reservoir 1 is replenished to the piston chamber 25, preparing for the next pressurization.

[0019] Under the pressure of the piston rod 24, the grease in the oil reservoir 1 enters the oil outlet 21 through the cylinder cover 2, and is then transported through the thin steel tube 3, which is threadedly connected to the internal threaded sleeve 6 inside the oil outlet 21. The end of the thin steel tube 3 away from the oil outlet 21 is connected to the oil filling hole of the equipment through the connecting sleeve 33 and the mating sleeve 31, and finally the grease is accurately injected into the parts that need lubrication (such as bearings, gears, etc.), completing the filling process.

[0020] An internal threaded sleeve 6 is inserted into the oil outlet 21. One end of a thin steel tube 3 is threaded into the internal threaded sleeve 6. Three ear plates 62 are provided, and the three ear plates 62 are installed in a ring at equal intervals at the end of the internal threaded sleeve 6 outside the oil outlet 21. One side of the ear plate 62 has a small hole 63. A ring 26 is fitted onto the oil outlet 21 and connected and fixed to the oil outlet 21. One side of the ring 26 has three circular holes 27 that mate with the small holes 63. A screw 4 is inserted into the channel formed by the small holes 63 and the circular holes 27. One end of the screw 4 is threaded to a nut 41, which is located on the side of the ring 26 away from the ear plate 62. In the traditional structure, the internal thread of the oil outlet 21 and the cylinder cover 2 are integrated. Once the thread is worn or stripped due to frequent disassembly and assembly, the oil outlet 21 cannot be disassembled and replaced separately. The entire cylinder cover 2 must be discarded and replaced with a new one. This not only leads to waste of parts but also accumulates high replacement costs.

[0021] This situation was completely changed by setting up an independently replaceable internal threaded sleeve 6. The internal threaded sleeve 6, designed specifically for connection with the thin steel pipe 3, has internal threads machined to match the external threads of the thin steel pipe 3. It is stably installed inside the oil outlet 21 using screws 4 and nuts 41, achieving a reliable threaded connection with the thin steel pipe 3 while forming a detachable independent structure with the oil outlet 21 and the cylinder cover 2. When frequent disassembly and reassembly of the thin steel pipe 3 damages the internal threads of the internal threaded sleeve 6, preventing a tight fit, the operator simply needs to remove the screws 4 and nuts 41 to remove the old internal threaded sleeve 6 from the oil outlet 21, replace it with a new one, and re-secure it. The entire process requires no modification or replacement of the oil outlet 21 or the cylinder cover 2.

[0022] This design simplifies the replacement of the entire cylinder cover 2 into a small component, the internal threaded sleeve 6. This not only significantly reduces the replacement cost of individual parts and minimizes unnecessary material waste, but also shortens maintenance and replacement time due to the small size and easy disassembly and assembly of the internal threaded sleeve 6. This avoids interruptions in equipment maintenance operations caused by component replacement, providing a practical guarantee for the later maintenance of construction machinery rental equipment from both cost control and operational efficiency perspectives.

[0023] An L-shaped plate 65 is provided on the side of the small hole 63 away from the ring 26. A through hole 64 is provided on the side of the L-shaped plate 65 facing the small hole 63. The through hole 64 and the small hole 63 are arranged concentrically. The end of the L-shaped plate 65 away from the through hole 64 is connected and fixed to the end of the ear plate 62 near the internal threaded sleeve 6. The screw 4 passes through the channel formed by the through hole 64, the small hole 63 and the round hole 27. First, the internal threaded sleeve 6 is inserted into the oil outlet 21, so that the three ear plates 62 on the outside of the internal threaded sleeve 6 are aligned with the ring 26 on the oil outlet 21. The small hole 63 on the ear plate 62 corresponds one-to-one with the round hole 27 on the ring 26. At the same time, the L-shaped plate 65 on one side of the ear plate 62 is also put into place, and its through hole 64 is concentric with the small hole 63 and the round hole 27. At this point, screw 4 is passed through the through hole 64 of L-shaped plate 65, the small hole 63 of ear plate 62 and the round hole 27 of ring 26 in sequence until one end of screw 4 extends out of ring 26 away from the side of ear plate 62. Then tighten nut 41 to complete the fixation. The whole process ensures that the internal thread sleeve 6 and oil outlet 21 are firmly connected.

[0024] It is worth noting that the L-shaped plate 65 plays a clever limiting role in the structure: since one end of the L-shaped plate 65 is fixed to the ear plate 62, and the other end extends away from the ring 26, the distance between its through hole 64 and the small hole 63 of the ear plate 62 forms a spatial constraint on the screw 4. After the screw 4 passes through the through hole 64, the small hole 63 and the round hole 27, a section of the screw 4 will be naturally exposed between the L-shaped plate 65 and the ring 26. This exposed part provides operating space for later maintenance. If the internal threaded sleeve 6 needs to be replaced due to long-term use, the exposed screw 4 can be directly cut off with a cutting tool, without having to disassemble the nut 41, which may be rusted or deformed. This greatly simplifies the replacement process of the internal threaded sleeve 6 and reduces maintenance time, which is especially suitable for scenarios in the maintenance of construction machinery rental equipment where frequent disassembly and assembly lead to easy wear and tear on the connecting parts.

[0025] The outer surface of the internal threaded sleeve 6 has multiple equally spaced, annular insertion slots 61 arranged along the length of the internal threaded sleeve 6. Insertion strips 28 are inserted into the insertion slots 61 and fixed to the inner wall of the oil outlet 21. A sealing ring 5 is installed at the end of the internal threaded sleeve 6 inside the oil outlet 21, and the sealing ring 5 contacts the inner wall of the oil outlet 21. When the internal threaded sleeve 6 is inserted into the oil outlet 21, the insertion strip 28 precisely embeds into the insertion slots 61, forming a set of interlocking limiting structures. This effectively prevents the internal threaded sleeve 6 from rotating circumferentially during the disassembly and assembly of the thin steel pipe 3 or during grease filling, avoiding loosening of the threaded connection due to rotation. It also prevents additional wear on the connecting parts caused by relative displacement between the internal threaded sleeve 6 and the oil outlet 21, thereby significantly improving the overall stability of the threaded connection between the thin steel pipe 3 and the internal threaded sleeve 6, ensuring that the pipeline remains stable during filling operations.

[0026] Meanwhile, a sealing ring 5 is installed at one end of the internal threaded sleeve 6 inside the oil outlet 21. This sealing ring 5 fits tightly against the inner wall of the oil outlet 21, forming a ring-shaped sealing barrier. During the pressurized delivery of grease, the sealing ring 5 effectively blocks the path of grease leakage from the gap between the internal threaded sleeve 6 and the oil outlet 21, completely solving the grease leakage problem caused by the clearance between components in traditional structures. This not only reduces grease waste but also ensures stable transmission of injection pressure, enabling the grease to be delivered to the lubrication points of the equipment in sufficient and accurate amounts, ensuring that the lubrication effect meets expectations, and providing a reliable grease delivery guarantee for the later maintenance of construction machinery rental equipment.

[0027] The above are merely specific embodiments of this utility model, but the technical features of this utility model are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on this utility model to solve essentially the same technical problems and achieve essentially the same technical effects are all covered within the protection scope of this utility model.

Claims

1. A post-construction machinery rental equipment maintenance device, characterized in that, include: Oil storage tank (1) has a circular cross-section; The cylinder cover (2) is threaded to one end of the oil storage cylinder (1), and an oil outlet (21) is installed on the edge of the cylinder cover (2) facing away from the oil storage cylinder (1). An internal threaded sleeve (6) is inserted into an oil outlet (21), and the internal threaded sleeve (6) is connected to the oil outlet (21) through a connector; A thin steel pipe (3) is threaded at one end into an internal threaded sleeve (6); The connector includes: There are three ear plates (62), which are installed in a ring at equal intervals at one end of the internal threaded sleeve (6) outside the oil outlet (21). One side of each ear plate (62) has a small hole (63). A ring (26) is fitted onto the oil outlet (21) and connected and fixed to the oil outlet (21). One side of the ring (26) is provided with three circular holes (27) that cooperate with the small hole (63). The screw (4) is inserted into the channel formed by the small hole (63) and the round hole (27). One end of the screw (4) is threaded with a nut (41), which is located on the side of the ring (26) away from the ear plate (62).

2. The post-maintenance device for construction machinery rental equipment according to claim 1, characterized in that: An L-shaped plate (65) is provided on the side of the small hole (63) away from the ring (26). A through hole (64) is provided on the side of the L-shaped plate (65) facing the small hole (63). The through hole (64) and the small hole (63) are arranged concentrically. The end of the L-shaped plate (65) away from the through hole (64) is connected and fixed to the end of the ear plate (62) near the internal thread sleeve (6). The screw (4) passes through the channel formed by the through hole (64), the small hole (63) and the round hole (27).

3. The post-construction machinery rental equipment maintenance device according to claim 1, characterized in that: The outer surface of the internal threaded sleeve (6) is provided with a plurality of insertion slots (61) arranged in an annular shape at equal intervals. The insertion slots (61) are arranged along the length direction of the internal threaded sleeve (6). Insertion strips (28) are inserted into the insertion slots (61) and the insertion strips (28) are fixed on the inner wall of the oil outlet (21).

4. The post-maintenance device for construction machinery rental equipment according to claim 3, characterized in that: The inner threaded sleeve (6) is fitted with a sealing ring (5) at one end inside the oil outlet (21), and the sealing ring (5) is in contact with the inner wall of the oil outlet (21).

5. The post-maintenance device for construction machinery rental equipment according to claim 1, characterized in that: The end of the thin steel pipe (3) away from the oil outlet (21) is threaded with a connecting sleeve (33) with internal threads machined on its inner surface. The end of the connecting sleeve (33) away from the thin steel pipe (3) is equipped with a connecting sleeve (31) for connecting the oil injection hole. The inner surface of the connecting sleeve (31) is machined with internal threads. The end of the connecting sleeve (31) near the connecting sleeve (33) is fitted with a hexahedron (32) that is connected and fixed to the connecting sleeve (31).

6. The post-maintenance device for construction machinery rental equipment according to claim 1, characterized in that: The cylinder cover (2) is rotatably connected to a connecting arm (22) at the middle of the side facing away from the oil storage cylinder (1). The end of the connecting arm (22) away from the cylinder cover (2) is rotatably connected to a pressure handle (23). The end of the pressure handle (23) near the cylinder cover (2) is rotatably mounted with a piston rod (24). The outer surface of the cylinder cover (2) is equipped with a piston chamber (25) that communicates with the oil storage cylinder (1) and the oil outlet (21). The end of the piston rod (24) away from the pressure handle (23) is inserted into the piston chamber (25).

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