Oil-free piston air compressor connecting rod piston assembly tooling

Abstract

The utility model relates to oil -free piston air compressor connecting rod piston assembly tool, especially in the technical field of assembly tool, the utility model discloses a base, limit block, pressure head, connecting rod positioning rod and spring, limit block is fixed through first bolt in the base edge, and the top of base is equipped with annular outer boss and its inside inner boss, and the cavity that forms the spring is contained between both, and spring is covered in the outer boss, and the lower end is fixed, and the upper end is connected with the bottom surface of inverted T type connecting rod positioning rod, and second bolt penetrates connecting rod positioning rod and inner boss, and connecting rod positioning rod can slide along its up and down, and pressure head is installed on power machine, and inside is equipped with the chamber of the connecting rod positioning rod guide, and the side wall is equipped with air hole. Through limit block, outer boss and connecting rod positioning rod realize accurate positioning to connecting rod, utilize power machine drive pressure head to complete the pressure equipment, have the advantage that positioning is accurate, and efficiency is high, and the degree of automation is high, effectively promote the assembly quality and consistency of oil -free piston air compressor connecting rod piston subassembly.

Description

Technical Field

[0001] This utility model relates to the field of assembly tooling technology, and in particular to an assembly tooling for the connecting rod piston of an oilless piston air compressor. Background Technology

[0002] Air compressors are mainly divided into two types: oil-lubricated air compressors and oil-free air compressors. Oil-free reciprocating air compressors use a piston-connecting rod mechanism to convert the rotary motion of the motor into the reciprocating motion of the piston, thereby compressing the gas. Because no lubricating oil is required during operation, they are particularly suitable for applications requiring high cleanliness, such as those in the food and pharmaceutical industries.

[0003] The working principle of an oil-free reciprocating air compressor is as follows: After the power is turned on, the motor runs and drives the eccentric wheel to rotate. The eccentric wheel then drives the connecting rod, and finally, through the piston-connecting rod structure, the rotational motion of the eccentric wheel is converted into the reciprocating motion of the piston head, thereby compressing the gas and expelling it. Therefore, the piston-connecting rod mechanism is the core component of the oil-free air compressor, and the machining accuracy and assembly quality of its parts directly affect the performance and reliability of the entire machine.

[0004] In actual assembly processes, machine assembly can effectively reduce the failure rate compared to purely manual assembly. Therefore, for critical components such as piston connecting rod mechanisms, it is usually necessary to design dedicated assembly fixtures and use machines for press-fitting to improve product consistency and stability and reduce assembly failures caused by human factors. Utility Model Content

[0005] (1) Technical solution To solve the above-mentioned technical problems, this utility model provides an assembly fixture for the connecting rod piston of an oil-free piston air compressor, including a base, a limiting block for limiting the connecting rod shank, a pressure head installed on a pneumatic motor or hydraulic press, a connecting rod positioning rod for fitting the small end of the connecting rod, and a spring. The limiting block is fixed to the edge of the base by a first bolt. An annular outer boss for limiting the small end of the connecting rod is provided at the middle of the top of the base. An inner boss is provided on the top of the base inside the outer boss. A receiving cavity for accommodating the spring is formed between the outer boss and the inner boss. The spring is sleeved on the outer wall of the inner boss and its lower end is fixed to the bottom inner wall of the receiving cavity. The longitudinal section of the connecting rod positioning rod is inverted T-shaped. The upper end of the spring is fixedly connected to the bottom surface of the connecting rod positioning rod. A second bolt is installed on the base. The lower end of the second bolt passes through the connecting rod positioning rod and the inner boss in sequence. The connecting rod positioning rod slides up and down along the second bolt.

[0006] Preferably, the base has waist-shaped holes on both sides.

[0007] Preferably, the sidewall of the pressure head is provided with a pair of air holes arranged opposite each other.

[0008] Preferably, the pressure head has a cavity for accommodating the connecting rod positioning rod, and the outer wall of the connecting rod positioning rod is clearance-fitted with the inner wall of the cavity.

[0009] Preferably, the connecting rod positioning rod is provided with a through hole for the second bolt to pass through, and the inner wall of the through hole is clearance-fitted with the outer wall of the second bolt.

[0010] Preferably, the diameter of the upper end of the second bolt is larger than the diameter of the through hole.

[0011] Preferably, the outer wall of the lower end of the connecting rod positioning rod and the inner wall of the outer boss are in clearance fit.

[0012] Preferably, the height of the outer boss is higher than the height of the inner boss.

[0013] (2) Beneficial effects This utility model provides a connecting rod piston assembly fixture for an oil-free piston air compressor. Compared with the prior art, this utility model has the following advantages: 1. The connecting rod handle is limited by the limiting block, and the small end of the connecting rod is precisely positioned inside and outside by the outer boss and the connecting rod positioning rod, which effectively prevents the misalignment problem during the press-fitting process.

[0014] 2. The combination of limit blocks, springs, and boss structures enables rapid positioning and stable press-fitting of the connecting rod, improving assembly accuracy and efficiency; clearance fit and sliding connection are adopted to ensure smooth movement and reduce wear.

[0015] 3. The spring provides cushioning and restoring force to ensure a smooth assembly process and avoid impact damage.

[0016] 4. This tooling can be used in conjunction with pneumatic motors or hydraulic presses to achieve semi-automatic or automatic assembly, significantly improving assembly efficiency and reducing the labor intensity of operators.

[0017] 5. A pair of air holes are provided on the side wall of the pressure head. Their function is to guide air outward, so as to prevent the air pressure in the internal sealing space from being too high, which may cause improper pressing or damage to the parts.

[0018] 6. The tooling has a compact structure and is easy to install and fix through the oblong hole. It is suitable for mass production and can effectively ensure the consistency of product assembly quality and reduce the failure rate. Attached Figure Description

[0019] Figure 1 This is a cross-sectional view of the tooling structure of this utility model.

[0020] Figure 2This is a schematic diagram showing the state of the tooling before the start of the process of this utility model.

[0021] Figure 3 This is a schematic diagram of the state of the needle roller bearing contact tooling of this utility model.

[0022] Figure 4 This is a schematic diagram showing the needle roller bearing of this utility model being pressed into place.

[0023] The attached diagram is labeled as follows: 1-base, 11-waist-shaped hole, 12-outer boss, 13-inner boss, 2-limiting block, 3-first bolt, 4-pressure head, 41-air hole, 5-connecting rod positioning rod, 6-spring, 7-second bolt, 8-connecting rod handle, 9-small end of connecting rod, 10-needle roller bearing. Detailed Implementation

[0024] The present invention will be further described in conjunction with the accompanying drawings and embodiments.

[0025] like Figures 1-4 As shown, the oil-free piston air compressor connecting rod piston assembly fixture of this utility model includes a base 1, a limiting block 2 for limiting the connecting rod handle 8, a pressure head 4 mounted on a pneumatic motor or hydraulic press, a connecting rod positioning rod 5 for fitting the small end of the connecting rod, and a spring 6. The limiting block 2 is fixed to the edge of the base 1 by a first bolt 3. The top center of the base 1 is provided with an annular outer boss 12 for limiting the small end of the connecting rod. The top of the base 1 inside the outer boss 12 is provided with an inner boss 13. A space is formed between the outer boss 12 and the inner boss 13 to accommodate the spring. The accommodating cavity is used. The spring 6 is sleeved on the outer wall of the inner boss 13 and its lower end is fixed on the bottom inner wall of the accommodating cavity. The longitudinal section of the connecting rod positioning rod 5 is inverted T-shaped. The function of the connecting rod positioning rod is to constrain the connecting rod and prevent it from deviating during the pressing process, which would cause errors when the needle roller bearing is pressed in and cause damage. The upper end of the spring 6 is fixedly connected to the bottom surface of the connecting rod positioning rod 5. A second bolt 7 is installed on the base 1. The lower end of the second bolt 7 passes through the connecting rod positioning rod 5 and the inner boss 13 in sequence. The connecting rod positioning rod 5 slides up and down along the second bolt 7.

[0026] The base 1 has waist-shaped holes 11 on both sides, and the base 1 can be flexibly fixed to the workbench by bolts passing through the waist-shaped holes 11.

[0027] The side wall of the pressure head 4 is provided with a pair of air holes 41 arranged opposite each other. Their function is to guide air outward, so as to prevent the air inside the small end 9 of the connecting rod and the spring 6 from being too high, which would cause improper pressing or damage to the parts. The pressure head 4 has a cavity for accommodating the connecting rod positioning rod 5. The outer wall of the connecting rod positioning rod 5 is fitted with the inner wall of the cavity to ensure accurate centering when the pressure head 4 is pressed down.

[0028] The connecting rod positioning rod 5 is provided with a through hole for the second bolt 7 to pass through. The inner wall of the through hole is clearance-fitted with the outer wall of the second bolt 7 to ensure that the connecting rod positioning rod 5 can slide smoothly up and down.

[0029] The upper diameter of the second bolt 7 is larger than the diameter of the through hole, which serves as a limit to prevent the connecting rod positioning rod 5 from being excessively lifted by the spring and disengaging. In its natural state, the elastic force of the spring 6 will push the connecting rod positioning rod 5 upward.

[0030] The lower outer wall of the connecting rod positioning rod 5 is fitted with the inner wall of the outer boss 12 to ensure vertical movement stability. The height of the outer boss 12 is higher than the height of the inner boss 13, forming an annular receiving cavity between them to ensure that the spring 6 has sufficient compression and rebound space.

[0031] Working principle: The connecting rod is placed into the fixture, with one side of its small end 9 aligned with the end face of the base. The hole of the small end 9 is fitted into the connecting rod positioning rod 5, and the connecting rod handle 8 rests against the limit block 2; Figure 2 , 3 As shown in Figure 4, the needle roller bearing 10 is fitted onto the connecting rod positioning rod 5 and placed above the small end 9 of the connecting rod. The pneumatic / hydraulic press is started, and the pressure head 4 moves downward. When the pressure head 4 contacts the needle roller bearing 10, it pushes the needle roller bearing 10 into the small end of the connecting rod. The needle roller bearing 10 continues downward to contact the lower end face of the connecting rod positioning rod 5, pushing the connecting rod positioning rod 5 downward together until the connecting rod positioning rod 5 hits the base, thus completing the process of pressing the connecting rod with the needle roller bearing 10. After the process is completed, the pressure head 4 moves upward, and the connecting rod positioning rod 5 returns to its original position via the spring 6, so that the connecting rod positioning rod 5 can then limit the next connecting rod. Content not described in detail in this specification belongs to the prior art known to those skilled in the art.

[0032] The embodiments described above are merely preferred embodiments of the present invention, and are described in a relatively specific and detailed manner. However, the present invention is not limited to these embodiments. It should be noted that for those skilled in the art, any improvements made without departing from the spirit of the present invention fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A connecting rod and piston assembly fixture for an oil-free piston air compressor, characterized in that, The base (1) includes a base, a limiting block (2) for limiting the connecting rod handle (8), a pressure head (4) mounted on a pneumatic motor or hydraulic press, a connecting rod positioning rod (5) for fitting the small end of the connecting rod, and a spring (6). The limiting block (2) is fixed to the edge of the base (1) by a first bolt (3). The base (1) has an annular outer boss (12) at the top center for limiting the small end of the connecting rod. The base (1) has an inner boss (13) on the top of the base (1) inside the outer boss (12). The outer boss (12) and the inner boss (13) are connected. A receiving cavity is formed between the inner boss (13) to accommodate the spring (6). The spring (6) is sleeved on the outer wall of the inner boss (13) and its lower end is fixed on the bottom inner wall of the receiving cavity. The longitudinal section of the connecting rod positioning rod (5) is inverted T-shaped. The upper end of the spring (6) is fixedly connected to the bottom surface of the connecting rod positioning rod (5). A second bolt (7) is installed on the base (1). The lower end of the second bolt (7) passes through the connecting rod positioning rod (5) and the inner boss (13) in sequence. The connecting rod positioning rod (5) slides up and down along the second bolt (7).

2. The oil-free piston air compressor connecting rod piston assembly tooling according to claim 1, characterized in that, The base (1) has waist-shaped holes (11) on both sides.

3. The oil-free piston air compressor connecting rod piston assembly tooling according to claim 1, characterized in that, The pressure head (4) has a pair of air holes (41) arranged opposite each other on its side wall.

4. The oil-free piston air compressor connecting rod piston assembly tooling according to claim 1, characterized in that, The pressure head (4) has a cavity for accommodating the connecting rod positioning rod (5), and the outer wall of the connecting rod positioning rod (5) is in clearance fit with the inner wall of the cavity.

5. The oil-free piston air compressor connecting rod piston assembly tooling according to claim 1, characterized in that, The connecting rod positioning rod (5) is provided with a through hole for the second bolt (7) to pass through, and the inner wall of the through hole is clearance-fitted with the outer wall of the second bolt (7).

6. The oil-free piston air compressor connecting rod piston assembly tooling according to claim 5, characterized in that, The upper diameter of the second bolt (7) is greater than the diameter of the through hole.

7. The oil-free piston air compressor connecting rod piston assembly tooling according to claim 1, characterized in that, The lower outer wall of the connecting rod positioning rod (5) and the inner wall of the outer boss (12) are fitted with a clearance.

8. The oil-free piston air compressor connecting rod piston assembly tooling according to claim 1, characterized in that, The height of the outer boss (12) is higher than the height of the inner boss (13).

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