Universal positioning and clamping tool for machining small end of marine diesel engine cylinder cover

Abstract

The utility model relates to a universal positioning and clamping tool for machining the small end of a marine diesel engine cylinder cover, which comprises a machine tool table top, a central positioning shaft, an adjustable positioning mandrel, an adjustable device and a supporting tool, and the adjustable positioning mandrel is connected with the machine tool table top through the central positioning shaft; the adjustable positioning mandrel comprises a hollow mandrel and an extension arm, the hollow mandrel is coaxial with the central positioning shaft, a plurality of positioning holes are formed in the extension arm in the radial direction of the hollow mandrel, and the adjustable devices are installed in the positioning holes and matched with cylinder cover connecting holes of the cylinder cover; the supporting tool comprises a supporting block, a compression bolt and a pressing plate, the supporting block is fixedly connected with the machine tool table top, the pressing plate is connected with the supporting block through the compression bolt, the compression bolt penetrates through the cylinder cover connecting hole, and the pressing plate and the supporting block are located on the upper surface and the lower surface of the cylinder cover connecting hole respectively. Compared with the prior art, manpower, time and economic cost for installing and replacing a mandrel tool during crane hoisting are saved, and the adaptability of the tool to cylinder covers of different sizes is improved.

Description

Technical Field

[0001] This utility model relates to the field of marine diesel engine cylinder head processing technology, and in particular to a universal positioning and clamping fixture for processing the small end of marine diesel engine cylinder head. Background Technology

[0002] Because the cylinder head machining dimensions of marine diesel engines are not uniform and there are many different engine models, multiple machining devices, including positioning and clamping fixtures, need to be adjusted when machining cylinder heads with different center holes and positioning holes in different sizes or positions. This results in additional auxiliary labor time, such as waiting for the crane and finding the fixture. In addition to increasing auxiliary time, it also reduces the effective cutting rate of the machine tool. Utility Model Content

[0003] The purpose of this utility model is to overcome the defects of the prior art and provide a universal positioning and clamping fixture for machining the small end of marine diesel engine cylinder heads that is easy to adapt to cylinder heads of different sizes.

[0004] The objective of this utility model can be achieved through the following technical solutions:

[0005] This utility model provides a universal positioning and clamping fixture for machining the small end of a marine diesel engine cylinder head, including a machine tool table, a central positioning shaft, an adjustable positioning mandrel, an adjustable device, and a support fixture. The adjustable positioning mandrel is connected to the machine tool table through the central positioning shaft.

[0006] The adjustable positioning mandrel includes a hollow mandrel and an extension arm. The hollow mandrel is coaxial with the central positioning shaft. The extension arm has multiple positioning holes along the radial direction of the hollow mandrel. The adjustable device is installed in the positioning holes and mates with the cylinder head connection hole of the cylinder head.

[0007] The support fixture includes a support block, clamping bolts, and a pressure plate. The support block is fixedly connected to the machine tool table. The pressure plate is connected to the support block through the clamping bolts, which pass through the cylinder head connection hole. The pressure plate and the support block are located on the upper and lower surfaces of the cylinder head connection hole, respectively.

[0008] Furthermore, the machine tool table is provided with a central hole, which mates with the central positioning shaft, and the adjustable positioning mandrel is connected to the central positioning shaft by a fine thread.

[0009] Furthermore, multiple guide rails are radially arranged along the central hole on the machine tool table, and the support block is fixedly connected to the machine tool table along the guide rails.

[0010] Furthermore, the adjustable device includes an adjustable shaft and a fixing bolt, with the adjustable shaft connected to the positioning hole on the adjustable positioning spindle via the fixing bolt.

[0011] Furthermore, the adjustable shaft is fitted with a clearance fit to the cylinder head connection hole.

[0012] Furthermore, the side of the adjustable shaft is tapered.

[0013] Furthermore, the support block is bolted to the machine tool table.

[0014] Furthermore, the number of supporting fixtures is four.

[0015] Furthermore, there are two adjustable devices, which are fixedly connected to the positioning holes on both sides of the hollow mandrel and the extension arm.

[0016] Furthermore, the extension arm has a scale along the radial direction of the hollow mandrel, and the positioning holes are evenly distributed along the scale.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] 1. This utility model features a central positioning shaft, an adjustable positioning mandrel, and an adjustable device on the machine tool table. The adjustable device is mounted on the adjustable positioning mandrel and positions the cylinder head connection hole. The adjustable positioning mandrel is connected to the machine tool table via the central positioning shaft. By replacing the adjustable positioning mandrel, cylinder heads with different diameter center holes can be adapted, saving manpower, time, and economic costs associated with using a crane for installation and replacement of the mandrel tooling. The adjustable positioning mandrel has multiple positioning holes radially. By changing the fixedly connected positioning holes, positioning for different cylinder head connection hole sizes can be achieved, improving the tooling's adaptability to cylinder heads of different sizes.

[0019] 2. This utility model uses bolted support blocks and pressure plates to press the cylinder head. The machine tool platform is provided with radial guide rails. The support blocks can change their fixed connection position with the machine tool platform along the guide rails, thereby achieving adaptation to different connection hole sizes and layouts.

[0020] 3. The present invention has a scale on the extension arm of the adjustable positioning mandrel, and the positioning holes are distributed along the scale. When the adjustable device is connected to the positioning holes, the size can be adapted more intuitively. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the assembly of the present invention with the cylinder head;

[0023] Figure 3 This is a top view of the present invention assembled with a cylinder head;

[0024] Figure 4 This is a front view of the present invention assembled with the cylinder head;

[0025] Figure 5Top view of traditional tooling and cylinder head assembly;

[0026] Figure 6 A partial sectional view of the assembly of traditional tooling and cylinder head;

[0027] Figure 7 A schematic diagram of the assembly structure of traditional tooling and cylinder head;

[0028] In the diagram, 1 is the machine tool table, 2 is the central positioning axis, 3 is the adjustable positioning spindle, 4 is the adjustable device, and 5 is the support fixture. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present utility model.

[0030] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0031] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0032] This embodiment relates to a universal positioning and clamping fixture for machining the small end of a marine diesel engine cylinder head, including a machine tool table 1, a central positioning shaft 2, an adjustable positioning mandrel 3, an adjustable device 4, and a support fixture 5. Figure 1 As shown, the adjustable positioning spindle 3 is connected to the machine tool table through the central positioning shaft 2, and the adjustable device 4 and the support fixture 5 are fixedly connected to the machine tool table 1 respectively.

[0033] In this embodiment, the machine tool table 1 is provided with a central hole, the central positioning shaft 2 is installed in the central hole, and the adjustable positioning spindle 3 is connected to the central positioning shaft 2 by a fine thread, so as to ensure that the coaxiality of the machine tool table 1, the central positioning shaft 2 and the adjustable positioning spindle 3 meets the technical requirements.

[0034] In this embodiment, the adjustable positioning mandrel 3 consists of a hollow mandrel in the middle and extension arms at both ends. The hollow mandrel is connected to the central positioning shaft 2 by fine-pitch threads, and the extension arms are bolted to the adjustable device 4 through positioning holes. When tooling needs to be changed, only the adjustable positioning mandrel 3 with different hollow mandrel outer diameters can be replaced to fit cylinder heads with different inner hole specifications, without having to replace the entire mandrel tooling. The adjustable device 4 consists of an adjustable shaft and fixing bolts. The adjustable shaft is installed onto the extension arms through the connection of the fixing bolts and positioning holes. The side of the adjustable shaft is tapered and has a clearance fit with the cylinder head connection hole of the cylinder head, used for clamping and positioning the cylinder head.

[0035] The assembly relationship between this utility model and the cylinder head is as follows: Figures 2-4 As shown, the cylinder head connection holes on the cylinder head have a flange-type layout. In this embodiment, there are multiple adjustable devices 4, preferably two. The two adjustable devices 4 are respectively installed on the extension arms on both sides of the hollow mandrel and cooperate with a pair of opposite cylinder head connection holes on the cylinder head. The extension arms are provided with a scale along the radial direction of the hollow mandrel, and there are multiple positioning holes evenly distributed along the scale. During assembly, the adjustable devices 4 can be installed by selecting the positioning hole position corresponding to the cylinder head connection hole to be assembled through the scale.

[0036] In this embodiment, the support fixture 5 consists of a support block, a clamping bolt, and a pressure plate connected in sequence. The support block is fixedly connected to the machine tool table 1, preferably by bolts. During assembly, the clamping bolt passes through the cylinder head connection hole of the cylinder head, and the distance between the support block and the pressure plate can be adjusted by adjusting the clamping bolt, thus pressing the cylinder head between the support block and the pressure plate.

[0037] In this embodiment, multiple guide rails are radially arranged along the central hole on the machine tool table 1. The support block can slide along the guide rails to change the position for bolting connection with the machine tool table 1. Multiple support fixtures 5 are used, preferably four. The four support fixtures 5 are evenly distributed on the machine tool table 1 and mate with the cylinder head connection holes that do not cooperate with the adjustable device 4, thereby achieving the function of pressing the cylinder head on the machine tool table 1. Since the fixed position of the support fixture 5 on the machine tool table 1 can be adjusted radially along the central hole via the guide rails, the support fixtures can also adapt to different cylinder head connection hole layouts.

[0038] Traditional tooling and cylinder head assembly methods, such as Figures 5-7As shown, when changing machine models, the traditional method requires repeatedly purchasing mandrels of different diameters, and the replacement process requires a crane for installation. In this embodiment, the universal positioning and clamping fixture for machining the small end of the marine diesel engine cylinder head only requires purchasing and replacing adjustable positioning mandrels of different specifications when changing machine models. The adjustable positioning mandrel can weigh as little as 10 catties, allowing on-site operators to easily pick it up and install it. The time required to change the fixture can be reduced from 1 hour to 10 minutes, significantly saving manpower, time, and economic costs associated with using a crane for installation and replacement of the mandrel fixture.

[0039] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A general positioning and clamping tool for the small end machining of a marine diesel engine cylinder head, characterized in that, The machine tool table (1), the center positioning shaft (2), the adjustable positioning mandrel (3), the adjustable device (4) and the support tooling (5) are included, and the adjustable positioning mandrel (3) is connected with the machine tool table (1) through the center positioning shaft (2); The adjustable positioning mandrel (3) includes a hollow mandrel coaxial with the center positioning shaft (2) and an extension arm with a plurality of positioning holes radially arranged along the hollow mandrel, and the adjustable device (4) is installed in the positioning hole and matched with the cylinder head connecting hole of the cylinder head; The support tooling (5) includes a support block, a compression bolt and a pressing plate, the support block is fixedly connected with the machine tool table (1), the pressing plate is connected with the support block through the compression bolt, the compression bolt passes through the cylinder head connecting hole, and the pressing plate and the support block are respectively located on the upper and lower surfaces of the cylinder head connecting hole.

2. A general purpose positioning and clamping tool for machining the small end of a cylinder head of a marine diesel engine according to claim 1, characterized in that, The machine tool table (1) is provided with a center hole matched with the center positioning shaft (2), and the adjustable positioning mandrel (3) is connected with the center positioning shaft (2) through fine thread connection.

3. A general purpose positioning and clamping tool for machining the small end of a cylinder head of a marine diesel engine according to claim 2, characterized in that, A plurality of guide rails are radially arranged along the center hole on the machine tool table (1), and the support block is fixedly connected with the machine tool table (1) along the guide rail.

4. A general purpose positioning and clamping tool for machining the small end of a cylinder head of a marine diesel engine according to claim 1, characterized in that, The adjustable device (4) includes an adjustable shaft and a fixing bolt, and the adjustable shaft is connected with the positioning hole on the adjustable positioning mandrel (3) through the fixing bolt.

5. A general purpose positioning and clamping tool for machining the small end of a cylinder head of a marine diesel engine according to claim 4, characterized in that, The adjustable shaft is matched with the cylinder head connecting hole in clearance.

6. A general purpose positioning and clamping fixture for machining the small end of a cylinder head of a marine diesel engine as claimed in claim 4, wherein, The side surface of the adjustable shaft is a conical surface.

7. A general purpose positioning and clamping fixture for machining the small end of a cylinder head of a marine diesel engine as claimed in claim 1, wherein, The support block is connected with the machine tool table (1) through a bolt.

8. A general purpose positioning and clamping fixture for machining the small end of a cylinder head of a marine diesel engine as claimed in claim 1, wherein, The number of the support tooling (5) is four.

9. A general purpose positioning and clamping fixture for machining the small end of a cylinder head of a marine diesel engine as claimed in claim 1, wherein, The number of the adjustable device (4) is two, and the adjustable device (4) is fixedly connected with the positioning hole on the extension arm on both sides of the hollow mandrel.

10. A general purpose positioning and clamping fixture for machining the small end of a cylinder head of a marine diesel engine as claimed in claim 1, wherein, A scale is radially arranged along the hollow mandrel on the extension arm, and the positioning holes are uniformly distributed along the scale.

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