Auxiliary mounting device for honing inner hole of valve rod guide sleeve

Abstract

The utility model belongs to the technical field of valve rod guide sleeve fixing device manufacturing, and particularly relates to an auxiliary mounting device for valve rod guide sleeve inner hole honing, which comprises a base and a middle block, a first through hole is formed in the center of the base, a second through hole is formed in the middle block, the middle block is fixed on the upper surface of the base through a first bolt, and the first through hole and the second through hole are coaxial; the inner diameter of the first through hole is larger than that of the second through hole, and at least two screw holes are axially formed in the upper surface of the middle block around the second through hole; according to the product characteristic that the four unthreaded holes are formed in the large outer circle of the valve rod guide sleeve, the auxiliary mounting device for honing the inner hole of the valve rod guide sleeve is designed, so that when the auxiliary mounting device is used, the valve rod guide sleeve is locked on the middle block in the mode that second bolts penetrate through at least two unthreaded holes in the valve rod guide sleeve in a penetrating mode; and the valve rod guide sleeve can be honed conveniently through a horizontal turning procedure before honing and a vertical honing machine.

Description

Technical Field

[0001] This application belongs to the field of valve stem guide sleeve fixing device manufacturing technology, specifically an auxiliary installation device for honing the inner hole of valve stem guide sleeve. Background Technology

[0002] As a crucial component of marine diesel engines, the valve stem guide sleeve's primary function is to support and guide the movement of the valve stem, ensuring the valve's proper opening and closing. The valve stem guide sleeve has multiple outer diameters and inner bores with high precision requirements, including dimensional, geometrical, and surface roughness tolerances. A key challenge lies in machining the inner bore with a large length-to-diameter ratio. Traditional machining methods use floating boring tools for inner bore finishing, but these methods suffer from instability (e.g., 1. vibration during machining, leading to chatter marks; 2. as the tool wears down, the bore diameter gradually decreases), making it difficult to guarantee product quality. However, the inventors discovered that by leaving a machining allowance of 0.05-0.07mm for the inner hole with a large length-to-diameter ratio in the horizontal turning process before honing, and then using a vertical honing machine to achieve the finishing of the inner hole of the valve stem guide sleeve, the instability of the inner hole finishing with a floating boring tool can be solved. However, how to fix the valve stem guide sleeve in the horizontal turning process before honing is an important problem for honing with a vertical honing machine. Solving how to fix the valve stem guide sleeve allows the valve stem guide sleeve to be honed through the horizontal turning process before honing and the vertical honing machine. Utility Model Content

[0003] The purpose of this application is to address the shortcomings of existing technologies by designing an auxiliary installation device for honing the inner hole of the valve stem guide sleeve, taking advantage of the product feature that the outer circumference of the valve stem guide sleeve has four smooth holes. This device allows the valve stem guide sleeve to be locked onto the intermediate block by a second bolt passing through at least two smooth holes on the valve stem guide sleeve during use, facilitating honing of the valve stem guide sleeve through the horizontal lathe process before honing and the vertical honing machine.

[0004] To achieve the above objectives, this application provides the following technical solution:

[0005] An auxiliary installation device for honing the inner bore of a valve stem guide sleeve includes a base and an intermediate block. The base has a first through hole in its center, and the intermediate block has a second through hole. The intermediate block is fixed to the upper surface of the base by a first bolt. The first through hole and the second through hole are coaxial. The inner diameter of the first through hole is larger than the inner diameter of the second through hole. The upper surface of the intermediate block has at least two screw holes axially arranged around the second through hole.

[0006] Preferably, a plurality of T-shaped blocks are evenly arranged around the first through hole on the lower surface of the base, and one end of the vertical portion of the T-shaped block away from the horizontal portion is fixedly connected to the lower surface of the base.

[0007] Preferably, the base is made of HT200 material.

[0008] Preferably, the intermediate block is made of Q235 steel plate.

[0009] Preferably, the base is a cylinder, and the intermediate block is disposed on the end face of the cylinder.

[0010] Preferably, the intermediate block is a cylinder.

[0011] Preferably, the intermediate block includes several block units, each of which has a slot. The length direction of the slot is parallel to the end face of the base and perpendicular to the central axis of the base. Each block unit has a screw hole located away from the slot. The screw hole is located between the end of the slot facing away from the central axis of the base and the central axis of the base. The block unit is fixedly connected to the base by a first bolt passing through the slot.

[0012] Compared with the prior art, the beneficial effects of this application are as follows:

[0013] 1. Based on the product characteristic of having four smooth holes on the large outer circle of the valve stem guide sleeve, this application designs an auxiliary installation device for honing the inner hole of the valve stem guide sleeve. This device allows the valve stem guide sleeve to be locked onto the intermediate block by passing a second bolt through at least two smooth holes on the valve stem guide sleeve during use, which facilitates honing of the valve stem guide sleeve through the horizontal lathe process before honing and the vertical honing machine.

[0014] 2. The inclusion of the T-block in this application facilitates the installation of the base into the T-slot on the intermediate worktable of the honing machine. For example... Figure 3 As shown, use an Allen wrench to tighten the Allen head screws onto the center worktable of the honing machine, and then fix the center block onto the base 1.

[0015] 3. The base in this application is a support component, therefore it is made of HT200 material. This is mainly because HT200 material has good casting properties, good machinability, good vibration absorption properties, and good friction and wear resistance. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure on which the valve stem guide sleeve is installed in this application;

[0017] Figure 2 for Figure 1 Top view;

[0018] Figure 3 for Figure 2 Sectional view of AA in the middle;

[0019] Figure 4 for Figure 2 Cross-sectional view of the middle section (BB);

[0020] Figure 5 This is a schematic diagram illustrating the second implementation method of the intermediate block in this application.

[0021] In the diagram: 1. Base; 2. Middle block; 3. First through hole; 4. Second through hole; 5. Bolt; 6. T-block; 7. Groove; 8. Screw hole; 9. Valve stem guide sleeve; 10. Second bolt. Detailed Implementation

[0022] like Figures 1-5 As shown, an auxiliary installation device for honing the inner hole of a valve stem guide sleeve includes a base 1 and an intermediate block 2. The base 1 has a first through hole 3 in the center, and the intermediate block 2 has a second through hole 4. The intermediate block 2 is fixed to the upper surface of the base 1 by a first bolt 5. The first through hole 3 and the second through hole 4 are coaxial. The inner diameter of the first through hole 3 is larger than the inner diameter of the second through hole 4. The upper surface of the intermediate block 2 has at least two screw holes 8 axially arranged around the second through hole 4.

[0023] In use, the valve stem guide sleeve 9 is placed vertically on the intermediate block 2, with the valve stem guide sleeve 9 coaxial with the second through hole 4. The second bolt 10 is inserted through the hole in the valve stem guide sleeve 9 into the screw hole 8 on the intermediate block, thereby locking the valve stem guide sleeve 9 onto the intermediate block 2. Then, the base 1 is fixed on the vertical honing machine. The honing head, which is embedded with an oilstone, is driven to rotate by the spindle vertically mounted on the honing machine. Simultaneously, under the drive of the hydraulic device, it makes a vertical reciprocating feed motion to hone the inner surface of the valve stem guide sleeve 9. The inner surface dimensions of the valve stem guide sleeve 9 are checked with an inner diameter gauge. After meeting the dimensional requirements of the drawing, it is removed. The entire design utilizes the characteristic of the valve stem guide sleeve 9 having a hole to fix it, which can ensure the accuracy of the inner surface of the valve stem guide sleeve 9. Since the honing head and the valve stem guide sleeve are coaxial, vibration is not easily generated.

[0024] As a preferred embodiment, a plurality of T-shaped blocks 6 are evenly arranged around the first through hole 3 on the lower surface of the base 1, and one end of the vertical portion of the T-shaped block 6 away from the horizontal portion is fixedly connected to the lower surface of the base 1. This arrangement of the T-shaped blocks 6 facilitates the installation of the base 1 into the T-slots on the working table of the honing machine. Figure 3 As shown, the base 1 is tightened onto the working table of the honing machine by using an Allen wrench to tighten the Allen head screws, and then the middle block 2 is fixed onto the base 1.

[0025] As a preferred embodiment, the base 1, being a support component, is made of HT200 material. This is primarily because HT200 material has good casting properties, good machinability, good vibration absorption properties, and good resistance to friction and wear.

[0026] As a preferred option, Q235 sheet metal is inexpensive, practical, and has good plasticity and toughness. Furthermore, the intermediate block 2 is a replacement part for the precision machining of the inner hole of the valve stem guide sleeve of different models. Therefore, the intermediate block 2 is made of Q235 sheet metal.

[0027] As a preferred embodiment, the base 1 is cylindrical, which facilitates installation and positioning and saves processing costs, and the intermediate block 2 is disposed on the end face of the cylinder.

[0028] As a preferred embodiment, the intermediate block 2 is a cylinder.

[0029] As a preferred method, to accommodate the machining of the inner hole (inner surface) of valve stem guide sleeves 9 of different models, the intermediate block 2 includes several block units, each of which has a slot 7. The length direction of the slot 7 is parallel to the end face of the base 1 and perpendicular to the central axis of the base 1. Each block unit has a screw hole 8 located away from the slot 7. The screw hole 8 is located between the end of the slot 7 facing away from the central axis of the base 1 and the central axis of the base 1. The block unit is fixedly connected to the base 1 by a first bolt 5 passing through the slot 7. With this configuration, when encountering a valve stem guide sleeve 9 of a larger model, the central axis of each block unit facing away from the first through hole 3 is moved to a preset distance, thereby increasing the distance between the screw hole 8 and the central axis of the first through hole 3, and thus allowing the use of a larger open hole in the valve stem guide sleeve 9. When encountering a smaller valve stem guide sleeve 9, the center lines of the first through holes 3 in each block unit are brought closer together, making the distance between the screw hole 8 and the central axis of the first through hole 3 closer. This allows the smooth hole on the smaller valve stem guide sleeve 9 to be coaxial with the screw hole 8 on the block unit, thereby locking the smaller valve stem guide sleeve 9 onto the intermediate block. Since the screw hole 8 is located between the end of the slot 7 facing away from the central axis of the base 1 and the central axis of the base 1, this arrangement ensures that the first bolt 5, which locks the intermediate block 2 to the base 1, will not affect the second bolt 10 used to lock the valve stem guide sleeve 9 and the intermediate block 2.

[0030] As a preferred embodiment, the upper surface of the intermediate block 2 is provided with an expansion opening at the slot 7. The width and length of the expansion opening are both greater than the width and length of the slot 7, and the depth of the expansion opening is greater than or equal to the head of the first bolt 5. This ensures that after the first bolt 5 fixes the intermediate block 2 to the base 1, the top of the first bolt 5 will be lower than or equal to the upper surface of the intermediate block 2, thus not affecting the fixing of the valve stem guide sleeve 9 to the intermediate block 2.

Claims

1. An auxiliary installation device for honing the inner bore of a valve stem guide sleeve, characterized in that: The device includes a base (1) and an intermediate block (2). The base (1) has a first through hole (3) in the center and the intermediate block (2) has a second through hole (4). The intermediate block (2) is fixed to the upper surface of the base (1) by a first bolt (5). The first through hole (3) and the second through hole (4) are coaxial. The inner diameter of the first through hole (3) is larger than the inner diameter of the second through hole (4). The upper surface of the intermediate block (2) has at least two screw holes (8) axially around the second through hole (4).

2. The auxiliary installation device for honing the inner hole of the valve stem guide sleeve according to claim 1, characterized in that: On the lower surface of the base (1), a plurality of T-shaped blocks (6) are evenly arranged around the first through hole (3), and one end of the vertical part of the T-shaped block (6) away from the horizontal part is fixedly connected to the lower surface of the base (1).

3. The auxiliary installation device for honing the inner hole of the valve stem guide sleeve according to claim 1, characterized in that: The base (1) is made of HT200 material.

4. The auxiliary installation device for honing the inner hole of the valve stem guide sleeve according to claim 1, characterized in that: The intermediate block (2) is made of Q235 sheet metal.

5. The auxiliary installation device for honing the inner hole of the valve stem guide sleeve according to claim 1, characterized in that: The base (1) is a cylinder, and the intermediate block (2) is disposed on the end face of the cylinder.

6. The auxiliary installation device for honing the inner hole of the valve stem guide sleeve according to claim 5, characterized in that: The intermediate block (2) is a cylinder.

7. The auxiliary installation device for honing the inner hole of the valve stem guide sleeve according to claim 5, characterized in that: The intermediate block (2) includes several block units, each of which has a slot (7). The length direction of the slot (7) is parallel to the end face of the base (1) and perpendicular to the central axis of the base (1). Each block unit has a screw hole (8) located away from the slot (7). The screw hole (8) is located between the end of the slot (7) facing away from the central axis of the base (1) and the central axis of the base (1). The block unit is fixedly connected to the base (1) by a first bolt (5) that passes through the slot (7).

Images