A cylinder lower cover for a pneumatic sander

Abstract

This utility model relates to the field of pneumatic sander technology, specifically to a cylinder lower cover for a pneumatic sander. The lower cover body has a lower cover protruding ring structure on the outer periphery of its top surface for limiting its fit against the bottom surface of the cylinder body. A lower cover positioning groove is formed on the top surface of the lower cover body. During assembly, the lower cover body is positioned and engaged with the lower cover positioning pin of the cylinder body via the lower cover positioning groove, and they abut against each other. Simultaneously, the lower cover protruding ring structure limits its fit against the lower cover limiting groove of the cylinder body, thereby quickly fitting the cylinder lower cover onto the bottom surface of the cylinder body. This prevents the cylinder lower cover from shifting on the bottom surface of the cylinder body, improves the relatively closed interface between the cylinder lower cover and the cylinder body, avoids the formation of a large gas leakage channel that would lead to a decrease in driving force and insufficient torque output, and is beneficial for improving the power response and operational efficiency of the pneumatic sander.

Description

Technical Field

[0001] This utility model relates to the field of pneumatic sander technology, specifically to a cylinder lower cover for a pneumatic sander. Background Technology

[0002] The cylinder of a pneumatic sander mainly consists of a cylinder body, upper cover, lower cover, rotor, eccentric shaft, blades, upper bearing, and lower bearing. Typically, the cylinder body and upper cover are clamped together by a locking spring on the rotor shaft to achieve a relatively sealed structure, preventing compressed air from easily leaking between them. The lower cover of the cylinder is one of the core structural components of the pneumatic sander. Its main functions are to seal the bottom of the cylinder, support the internal moving components, and participate in air circuit sealing and lubrication. A good seal also prevents external dust and impurities from entering the cylinder, extending the equipment's lifespan. It prevents the cylinder from shifting when impacted or subjected to shocks, maintaining its original position. Shifting or misalignment could lead to insufficient power or the machine failing to rotate.

[0003] However, the cylinder bottom cover commonly found on the market has a significant defect: the cylinder bottom cover only rests against the bottom surface of the cylinder body. During equipment operation, it is very easy for it to shift due to factors such as vibration, pressure fluctuations, or temperature changes. This causes the relatively sealed interface between the cylinder body and the cylinder bottom cover to fail, forming a channel for a large amount of gas leakage. This defect in relative sealing performance not only causes the risk of air seepage or leakage, but also directly affects the cylinder, resulting in a decrease in driving force and insufficient torque output. This causes problems such as slow power response and significantly reduced operating efficiency of the pneumatic sander. Summary of the Invention

[0004] In order to overcome the shortcomings and deficiencies of the existing technology, the purpose of this utility model is to provide a cylinder lower cover for a pneumatic sander.

[0005] The purpose of this utility model is achieved through the following technical solution: a cylinder lower cover for a pneumatic sander, comprising a lower cover body, wherein the outer periphery of the top surface of the lower cover body has a lower cover protruding ring structure for limiting and covering the bottom surface of the cylinder body, and a lower cover positioning groove is provided on the top surface of the lower cover body.

[0006] Preferably, the lower cover body has an eccentric shaft clearance through hole in the middle for the eccentric shaft to pass through the lower cover body.

[0007] Preferably, the bottom surface of the lower cover body has a protruding fixing ring seat that communicates with the eccentric shaft clearance through hole, and the fixing ring seat is used to fix the embedded bearing.

[0008] Preferably, the top surface of the lower cover body is provided with a lower cover guide groove.

[0009] Preferably, the lower cover guide channel includes an air inlet channel area, a straight air guide channel area, and an arc-shaped air guide channel area that are sequentially connected from the outer periphery of the lower cover body to the center.

[0010] Preferably, the depth of the lower cover guide groove is one-third to one-half the thickness of the lower cover body.

[0011] The beneficial effects of this utility model are as follows: The cylinder lower cover of the pneumatic sander of this utility model adopts a lower cover body. The outer periphery of the top surface of the lower cover body has a lower cover protruding ring structure for limiting and covering the bottom surface of the cylinder body. The top surface of the lower cover body is provided with a lower cover positioning groove. When the cylinder lower cover is actually assembled, the cylinder body itself meets the following conditions: the bottom surface of the cylinder body is fixedly provided with a lower cover positioning pin that positions and abuts against the lower cover positioning groove; the outer periphery of the bottom surface of the cylinder body is provided with a lower cover limiting groove that limits and cooperates with the lower cover protruding ring structure. Based on this, during assembly, the lower cover body is positioned and engaged with the lower cover positioning pin of the cylinder body through the lower cover positioning groove and abuts against each other. At the same time, the lower cover convex ring structure limits the engagement with the lower cover limiting groove of the cylinder body, thereby quickly closing the lower cover of the cylinder body onto the bottom surface of the cylinder body. This prevents the lower cover of the cylinder body from shifting on the bottom surface of the cylinder body, improves the relatively closed interface between the lower cover of the cylinder body and the cylinder body, avoids the formation of a channel for large gas leakage, which would lead to a decrease in driving force and insufficient torque output. This is beneficial to improving the power response and operational efficiency of the pneumatic sander. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a top view of the present invention; Figure 3 This is a side view of the present invention; The attached diagram is labeled as follows: 1. Lower cover body; 2. Lower cover convex ring structure; 3. Lower cover positioning groove; 4. Eccentric shaft clearance through hole; 5. Fixing ring seat; 6. Lower cover guide groove; 61. Air inlet groove area; 62. Straight air guide groove area; 63. Curved air guide groove area. Detailed Implementation

[0013] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and accompanying drawings. The content mentioned in the embodiments is not intended to limit the present invention.

[0014] like Figure 1-3 As shown, a cylinder lower cover for a pneumatic sander includes a lower cover body 1. The outer periphery of the top surface of the lower cover body 1 has a lower cover protruding ring structure 2 for limiting and covering the bottom surface of the cylinder body. The top surface of the lower cover body 1 is provided with a lower cover positioning groove 3.

[0015] During actual assembly, the cylinder body itself meets the following conditions: a lower cover positioning pin is fixedly provided on the bottom surface of the cylinder body, which is positioned and abuts against the lower cover positioning groove 3; a lower cover limiting groove is circumferentially opened on the outer periphery of the bottom surface of the cylinder body, which is limited and cooperates with the lower cover convex ring structure 2. Based on this, during assembly, the lower cover body 1 is positioned and cooperates with the lower cover positioning pin of the cylinder body through the lower cover positioning groove 3, and abuts against each other. At the same time, the lower cover convex ring structure 2 limits and cooperates with the lower cover limiting groove of the cylinder body, thereby quickly closing the lower cover onto the bottom surface of the cylinder body. This prevents the lower cover from shifting on the bottom surface of the cylinder body, improves the relatively closed interface between the lower cover and the cylinder body, avoids the formation of a channel for large gas leakage, which would lead to a decrease in driving force and insufficient torque output. This is beneficial to improving the power response and operating efficiency of the pneumatic sander.

[0016] Furthermore, the lower cover body 1 has an eccentric shaft clearance through hole 4 in the middle for the eccentric shaft to pass through the lower cover body 1.

[0017] Furthermore, the bottom surface of the lower cover body 1 has a protruding fixing ring seat 5 that communicates with the eccentric shaft clearance through hole 4. The fixing ring seat 5 is used to fix the embedded bearing. In actual assembly, the eccentric shaft is fixedly inserted into the inner ring of the bearing and passes through the eccentric shaft clearance through hole 4 to connect the rotor.

[0018] Furthermore, the top surface of the lower cover body 1 is provided with a lower cover guide groove 6. During actual assembly, the cylinder body itself meets the following conditions: the side wall of the cylinder body is provided with an air inlet hole, the bottom surface of the cylinder body is provided with a lower cover guide hole that connects to the air inlet hole, the lower cover guide groove 6 is connected to the lower cover guide hole, and the lower cover guide groove 6 is used to assist in guiding air so that the gas pushes the blades in the cylinder to drive the rotor to rotate through the lower cover guide groove 6.

[0019] Furthermore, the lower cover guide channel 6 includes an air inlet channel area 61, a straight air guide channel area 62, and an arc-shaped air guide channel area 63, which are sequentially connected from the outer periphery of the lower cover body 1 towards the center. In actual use, the air inlet channel area 61 is connected to the air guide hole of the lower cover. Compressed air from the air guide hole of the lower cover enters the air inlet channel area 61 and is guided to the straight air guide channel area 62, and then to the arc-shaped air guide channel area 63. This allows the compressed air to be sent along the arc-shaped air guide channel area 63 into the gap between the rotor and the blades to assist in driving the rotor, promote the rotation of the blades and the rotor, and improve the efficiency of compressed air utilization.

[0020] Furthermore, the depth of the lower cover guide groove 6 is one-third to one-half the thickness of the lower cover body 1, so that more compressed air can drive the blades in the cylinder to rotate along the lower cover guide groove 6, which plays a significant auxiliary role, especially at the beginning of the start-up, eliminating the need for manual rotation of the grinding disc of the pneumatic sander. In this embodiment, the depth of the lower cover guide groove 6 is one-half the thickness of the lower cover body 1.

[0021] The above embodiments are preferred implementations of this utility model. In addition, this utility model can also be implemented in other ways. Any obvious substitutions without departing from the concept of this utility model are within the protection scope of this utility model.

Claims

1. An air cylinder lower cover for a pneumatic sander, comprising a lower cover body, characterized by: The top surface of the lower cover body has a lower cover protruding ring structure for limiting cover on the bottom surface of the cylinder body.

2. The lower cover of the pneumatic cylinder of the pneumatic sanding machine according to claim 1, characterized in that: The middle part of the lower cover body is provided with an eccentric shaft accommodation through hole for the eccentric shaft to pass through the lower cover body.

3. The lower cover of the pneumatic cylinder of the pneumatic sanding machine according to claim 2, characterized in that: The bottom surface of the lower cover body protrudes a fixed ring seat which is communicated with the eccentric shaft accommodation through hole and is used for fixing the embedded bearing.

4. The lower cylinder cover of a pneumatic sander according to claim 1, wherein: The top surface of the lower cover body is provided with a lower cover flow guide groove.

5. The lower cylinder cover of a pneumatic sander according to claim 4, characterized in that: The lower cover flow guide groove includes a gas inlet groove area, a straight line gas guide groove area and an arc line gas guide groove area which are communicated in sequence from the outer periphery to the center of the lower cover body.

6. The lower cylinder cover of a pneumatic sander according to claim 4, characterized in that: The depth of the lower cover flow guide groove is one third to one half of the thickness of the lower cover body.

Images