Variable-diameter core-taking device and method applicable to marine diesel engine cylinder block

Abstract

The present invention provides a variable-diameter core-taking device and method applicable to a marine diesel engine cylinder block. The device includes: The device body includes a working part and a connecting part integrally formed and connected. A set of integrally connected cutter pad mounting grooves and spiral chip removal grooves are respectively opened in the radially symmetric directions of the working part. An inner cutter pad and an outer cutter pad are respectively arranged in the symmetrically arranged cutter pad mounting grooves. An inner magnetic attraction tooth-shaped positioning block is installed on the inner cutter pad, and an outer magnetic attraction tooth-shaped positioning block is installed on the outer cutter pad. A clamping part is formed between the magnetic attraction tooth-shaped positioning block and the cutter pad mounting groove, and the cutter pad forms a sliding mechanism that can move relatively radially with respect to the cutter pad mounting groove through the clamping part. The present invention can freely combine different drill diameters / core-taking outer diameters required by different size specifications, is applicable to the core-taking size requirements of different marine diesel engine cylinder blocks, eliminates the need to equip core-taking devices of various size specifications, simplifies the operation process, greatly improves the processing efficiency, and effectively reduces the production cost.

Description

Technical Field

[0001] The present invention relates to the technical field of core sampling for marine diesel engine cylinder blocks, and specifically, to a variable-diameter core sampling device and method applicable to marine diesel engine cylinder blocks. Background Art

[0002] After the casting of a marine diesel engine cylinder block, it is necessary to collect specimens for chemical composition analysis and various mechanical property tests to check whether the performance parameters of the finished product meet the expected technical requirements. The common sampling form is core drilling to obtain specimens. A core drill is a drill bit for machining holes in solid materials in a circular cutting manner. Its high efficiency and the ability to leave a core are not possessed by other tools.

[0003] The core sampling technical requirements for marine diesel engine cylinder blocks of various models are different. The drilling outer diameter is Φ65 - Φ80mm, the core sampling outer diameter is Φ28 - Φ32mm, and the depth is 90 - 230mm. The existing core sampling devices have fixed drill diameters and core sampling diameters. To cover the full range of core sampling specifications, basically each model needs to be equipped with a dedicated core sampling device. Frequent tool replacement not only results in low operation efficiency but also increases the procurement cost. For some core sampling size specification devices with low usage frequency, it is even a waste of resources. Summary of the Invention

[0004] In view of the above-mentioned deficiencies in the prior art, the present invention provides a variable-diameter core sampling device and method applicable to marine diesel engine cylinder blocks.

[0005] According to one aspect of the present invention, there is provided a variable-diameter core sampling device applicable to marine diesel engine cylinder blocks, including: a device body, an inner tool pad, an outer tool pad, an inner magnetic attraction tooth-shaped positioning block, and an outer magnetic attraction tooth-shaped positioning block; wherein:

[0006] The device body includes a working part and a connecting part integrally formed and connected. A set of integrally connected tool pad mounting grooves and spiral chip removal grooves are respectively opened in the radially symmetrical directions of the working part. The inner tool pad and the outer tool pad are respectively arranged in the symmetrically arranged tool pad mounting grooves. The inner magnetic attraction tooth-shaped positioning block is installed on the inner tool pad, and the outer magnetic attraction tooth-shaped positioning block is installed on the outer tool pad;

[0007] A clamping part is formed between the magnetic attraction tooth-shaped positioning block and the tool pad mounting groove, and the tool pad forms a sliding mechanism with the tool pad mounting groove that can move relatively radially through the clamping part.

[0008] Optionally, the tool pad mounting groove is provided with a radial positioning tooth block groove and a dovetail groove. The magnetic attraction tooth-shaped positioning block respectively forms a clamping part with the corresponding positioning tooth block groove; the dovetail groove is used to limit the relative lateral movement and longitudinal movement between the corresponding tool pad and the tool pad mounting groove.

[0009] Optionally, the magnetic tooth-shaped positioning block and the positioning tooth block groove are engaged with each other through a matching tooth-shaped structure to form a clamping portion.

[0010] Optionally, both the inner tool pad and the outer tool pad include: a pad body, and a positioning groove, a blade mounting groove and a bottom dovetail block provided on the pad body; wherein: the magnetic tooth-shaped positioning block is adjustably mounted in the corresponding positioning groove through a fastening bolt, and the bottom dovetail block is adaptively connected with the corresponding tool pad mounting groove to limit the relative lateral movement and longitudinal movement between the corresponding tool pad and the tool pad mounting groove;

[0011] When the fastening bolt is loosened, the magnetic tooth-shaped positioning block is adsorbed in the corresponding positioning groove, and the corresponding tool pad can move radially.

[0012] When the fastening bolt is tightened, the magnetic tooth-shaped positioning block is clamped with the tool pad mounting groove, and the corresponding tool pad cannot move.

[0013] Optionally, when the tool pad and the tool pad mounting groove move relative to each other radially, various required inner drill diameters and outer drill diameters can be freely combined.

[0014] Optionally, when the inner tool pad and the outer tool pad are both at the initial position of the clamping portion, the inner drill diameter and the outer drill diameter are d and D respectively. The inner magnetic tooth-shaped positioning block and the outer magnetic tooth-shaped positioning block are adjusted radially inward or outward along the dovetail groove of the tool pad mounting groove by n1 tooth pitches and n2 tooth pitches respectively relative to the initial position of the corresponding clamping portion, and new inner drill diameter and outer drill diameter sizes of (d - n1×pi) and (D + n2×pi) are obtained, where pi is the tooth pitch of the tooth-shaped structure of the magnetic tooth-shaped positioning block.

[0015] Optionally, the initial position of the clamping portion refers to an initial position set on the positioning tooth block groove radially provided in the tool pad mounting groove.

[0016] Optionally, the connecting portion adopts a Morse taper shank.

[0017] Optionally, the device further includes: an inner cutting blade and an outer cutting blade; the inner cutting blade and the outer cutting blade are respectively mounted on the inner tool pad and the outer tool pad.

[0018] According to another aspect of the present invention, a method for changing the diameter of a variable-diameter coring device is provided, including:

[0019] Install and fix the inner cutting blade and the outer cutting blade in the blade mounting grooves of the corresponding tool pads respectively;

[0020] Fix and install the magnetic adsorption tooth-shaped positioning block in the corresponding positioning groove of the tool pad, and make the magnetic adsorption tooth-shaped positioning block adsorb on the inner wall of the positioning groove;

[0021] Match the bottom dovetail block of the tool pad with the dovetail groove in the tool pad installation groove to form a sliding mechanism that can move radially relative to each other;

[0022] Move the inner tool pad and the outer tool pad to the initial position of the positioning tooth block groove in the tool pad installation groove, and set the size specifications of the inner drill diameter and the outer drill diameter of the core material taking device at the initial position to be d and D respectively;

[0023] Adjust the tooth pitches of the inner magnetic adsorption tooth-shaped positioning block and the outer magnetic adsorption tooth-shaped positioning block relative to the initial positions of the corresponding positioning tooth block grooves to be n1 tooth pitches and n2 tooth pitches respectively; engage the magnetic adsorption tooth-shaped positioning block with the corresponding positioning tooth block groove to fix the position of the tool pad. At this time, the size specifications of the inner drill diameter and the outer drill diameter of the core material taking device are (d - n1×pi) and (D + n2×pi) respectively, where pi is the tooth pitch of the tooth-shaped structure of the magnetic adsorption tooth-shaped positioning block;

[0024] According to the actual core material taking situation of the workpiece, substitute the parameters into (d - n1×pi) and (D + n2×pi) respectively to adjust the inner drill diameter and the outer drill diameter of the core material taking device.

[0025] Due to the adoption of the above technical solution, compared with the prior art, the present invention has at least one of the following beneficial effects:

[0026] The variable-diameter core material taking device and method applicable to the marine diesel engine cylinder block provided by the present invention form a trepanning device with adjustable drill diameter and core taking outer diameter by arranging a pair of device bodies with dovetail grooves and positioning tooth blocks through fastening bolts and the device body, with reasonable structure and simple operation.

[0027] The variable-diameter core material taking device and method applicable to the marine diesel engine cylinder block provided by the present invention realize the free switching between two working states of moving and fixing the position of the tool pad through the mutual cooperation of the dovetail groove and the tooth-shaped positioning block mechanism of the inner and outer tool pads, and can freely combine different size specifications of drill diameter / core taking outer diameter, eliminating the need to equip each model with a special core taking device and improving the work efficiency.

[0028] The variable-diameter core material taking device and method applicable to the marine diesel engine cylinder block provided by the present invention have the characteristics of simplifying the operation difficulty, improving the trepanning operation efficiency, reducing the procurement cost, being safe and reliable, etc. Description of the Drawings

[0029] By reading the detailed description of the non-restrictive embodiments with reference to the following drawings, other features, purposes and advantages of the present invention will become more obvious:

[0030] Figure 1 This is a schematic diagram of the component composition of a variable-diameter core-taking device applicable to a marine diesel engine cylinder block in a preferred embodiment of the present invention.

[0031] Figure 2 This is a schematic diagram of the structure of a positioning tooth block groove in a preferred embodiment of the present invention.

[0032] Figure 3 This is a schematic diagram of the overall structure of a variable-diameter core-taking device applicable to a marine diesel engine cylinder block in a preferred embodiment of the present invention.

[0033] Figure 4 This is a working flow chart of the variable-diameter method of the variable-diameter core-taking device in a preferred embodiment of the present invention.

[0034] In the figure: 1 is the connection part of the device body, 2 is the limit groove, 3 is the chip removal groove, 4 is the working part of the device body, 5 is the inner magnetic attraction tooth-shaped positioning block, 6 is the positioning groove, 7 is the inner tool pad, 8 is the inner cutting blade, 9 is the first fastening bolt, 10 is the second fastening bolt, 11 is the positioning tooth block groove, 12 is the dovetail groove, 13 is the third fastening bolt, 14 is the outer cutting blade, 15 is the blade installation groove, 16 is the outer tool pad, 17 is the outer magnetic attraction tooth-shaped positioning block, 18 is the fourth fastening bolt, 19 is the bottom dovetail block. Specific Embodiments

[0035] The following is a detailed description of the embodiments of the present invention: These embodiments are implemented on the premise of the technical solution of the present invention, and detailed implementation manners and specific operation processes are given. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention.

[0036] An embodiment of the present invention provides a variable-diameter core-taking device applicable to a marine diesel engine cylinder block. The device meshes the magnetic attraction tooth-shaped positioning blocks on the inner and outer tool pads with the positioning tooth block grooves on the device body, and can freely combine drill diameters and core-taking outer diameters of different size specifications, which is applicable to the core-taking size requirements of different marine diesel engine cylinder blocks, eliminating the need to equip core-taking devices of various size specifications, simplifying the operation process, greatly improving the processing efficiency, and effectively reducing the production cost.

[0037] As Figure 1 and Figure 3 shown, the variable-diameter core-taking device applicable to a marine diesel engine cylinder block provided in this embodiment may include: a device body, an inner tool pad, an outer tool pad, an inner magnetic attraction tooth-shaped positioning block, and an outer magnetic attraction tooth-shaped positioning block; wherein:

[0038] The device body includes a working part and a connecting part which are integrally formed and connected. A set of integrally connected cutter pad mounting grooves and spiral chip removal grooves are respectively opened in the radially symmetric directions of the working part. The inner cutter pad and the outer cutter pad are respectively arranged in the symmetrically arranged cutter pad mounting grooves. The inner magnetic attraction tooth-shaped positioning block is mounted on the inner cutter pad, and the outer magnetic attraction tooth-shaped positioning block is mounted on the outer cutter pad;

[0039] A clamping part is formed between the magnetic attraction tooth-shaped positioning block and the cutter pad mounting groove. The cutter pad forms a sliding mechanism with the cutter pad mounting groove that can move relatively radially through the clamping part.

[0040] In a preferred embodiment, a radial positioning tooth block groove and a dovetail groove are provided in the cutter pad mounting groove. Clamping parts are respectively formed between the magnetic attraction tooth-shaped positioning blocks and the corresponding positioning tooth block grooves; the dovetail groove is used to limit the relative lateral movement and longitudinal movement between the corresponding cutter pad and the cutter pad mounting groove.

[0041] Furthermore, the magnetic attraction tooth-shaped positioning block and the positioning tooth block groove are mutually engaged through a matching tooth-shaped structure to form a clamping part.

[0042] In a preferred embodiment, both the inner cutter pad and the outer cutter pad include: a pad body, and a positioning groove, a blade mounting groove and a bottom dovetail block provided on the pad body; wherein: the magnetic attraction tooth-shaped positioning block is adjustably mounted in the corresponding positioning groove through a fastening bolt, and the bottom dovetail block is adaptively connected with the corresponding cutter pad mounting groove to limit the relative lateral movement and longitudinal movement between the corresponding cutter pad and the cutter pad mounting groove;

[0043] When the fastening bolt is loosened, the magnetic attraction tooth-shaped positioning block is adsorbed in the corresponding positioning groove, and the corresponding cutter pad can move radially;

[0044] When the fastening bolt is tightened, the magnetic attraction tooth-shaped positioning block is clamped with the cutter pad mounting groove, and the corresponding cutter pad cannot move.

[0045] In a preferred embodiment, when the cutter pad moves relatively radially with respect to the cutter pad mounting groove, various required inner drill diameters and outer drill diameters can be freely combined.

[0046] Furthermore, when the inner cutter pad and the outer cutter pad are both at the initial position of the clamping part, the size specifications of the inner drill diameter and the outer drill diameter are d and D respectively. When the inner magnetic attraction tooth-shaped positioning block and the outer magnetic attraction tooth-shaped positioning block are adjusted radially inward or outward along the dovetail groove of the cutter pad mounting groove by n1 tooth pitches and n2 tooth pitches respectively with respect to the initial position of the corresponding clamping part, the new size specifications of the inner drill diameter and the outer drill diameter are (d - n1 × pi) and (D + n2 × pi), where pi is the tooth pitch of the tooth-shaped structure of the magnetic attraction tooth-shaped positioning block. As Figure 2 shown.

[0047] Further, the initial position of the engaging portion refers to an initial position set on the positioning tooth block groove radially arranged in the tool pad installation groove, which is used to facilitate the calculation of the tooth pitch.

[0048] In a preferred embodiment, the connecting portion employs a Morse taper shank.

[0049] In a preferred embodiment, the device further includes: an inner cutting blade and an outer cutting blade; the inner cutting blade and the outer cutting blade are respectively installed on the inner tool pad and the outer tool pad.

[0050] For the variable-diameter core-taking device provided in the above embodiments of the present invention, its diameter-changing method, as Figure 4 shown, may include:

[0051] S1, respectively install and fix the inner cutting blade and the outer cutting blade in the blade installation grooves of the corresponding tool pads;

[0052] S2, fixedly install the magnetic adsorption tooth-shaped positioning block in the positioning groove of the corresponding tool pad, and make the magnetic adsorption tooth-shaped positioning block adsorb on the inner wall of the positioning groove;

[0053] S3, mate the bottom dovetail block of the tool pad with the dovetail groove in the tool pad installation groove to form a sliding mechanism that can move relatively radially;

[0054] S4, move the inner tool pad and the outer tool pad to the initial position of the positioning tooth block groove in the tool pad installation groove, and set the size specifications of the inner drill diameter and the outer drill diameter of the core-taking device at the initial position to be d and D respectively;

[0055] S5, adjust the tooth pitches of the inner magnetic adsorption tooth-shaped positioning block and the outer magnetic adsorption tooth-shaped positioning block relative to the initial position of the corresponding positioning tooth block groove to be n1 tooth pitches and n2 tooth pitches respectively; engage the magnetic adsorption tooth-shaped positioning block with the corresponding positioning tooth block groove to fix the position of the tool pad. At this time, the size specifications of the inner drill diameter and the outer drill diameter of the core-taking device are (d - n1 × pi) and (D + n2 × pi) respectively, where pi is the tooth pitch of the tooth-shaped structure of the magnetic adsorption tooth-shaped positioning block;

[0056] S6, according to the actual core-taking situation of the workpiece, substitute the parameters into (d - n1 × pi) and (D + n2 × pi) respectively to adjust the inner drill diameter and the outer drill diameter of the core-taking device.

[0057] The following further illustrates the technical solutions provided in the above embodiments of the present invention with reference to the accompanying drawings.

[0058] As Figure 1 and Figure 3As shown in the figure, the variable-diameter core-taking device provided by the above embodiments of the present invention includes a device body, an inner cutter pad 7, an outer cutter pad 16, inner cutting blades 8, outer cutting blades 14, an inner magnetic-absorbing tooth-shaped positioning block 5, an outer magnetic-absorbing tooth-shaped positioning block 17, and first to fourth fastening bolts 9, 10, 13, and 18. Among them: The device body includes a working part 4 and a connecting part 1. The working part 4 and the connecting part 1 are integrally designed, and a limiting groove 2, a spiral chip removal groove 3, and a cutter pad installation groove located at the top of the working part 4 are provided; the cutter pad installation groove is provided with a radial positioning tooth block groove 11 and a dovetail groove 12 at the bottom. The inner and outer cutter pads are provided with blade installation grooves 15 and positioning grooves 6, and a dovetail block 19 is also provided at the bottom.

[0059] The working part 4 and the connecting part 1 of the device body are integrally designed. The connecting part 1 adopts a Morse taper shank, and a limiting groove 2 is provided at the shoulder part of the Morse taper shank to prevent the device from loosening and rotating during operation. A spiral chip removal groove is provided inside the working part 4 to quickly discharge the accumulated chips.

[0060] As Figure 2 shown in the figure, the cutter pad installation groove at the top of the working part 4 of the device body is provided with a radial positioning tooth block groove 11 in the vertical direction. The directional tooth block groove 11 is provided with straight teeth with a tooth pitch of pi, and the position of adjusting the "0" point is set as the initial position. A dovetail groove 12 is provided at the bottom of the cutter pad installation groove.

[0061] The inner cutter pad 7 and the outer cutter pad 16 are respectively provided with a blade installation groove 15, a positioning groove 6, and a dovetail block 19.

[0062] The inner cutting blade 8 is installed and fixed in the blade installation groove of the inner cutter pad 7 through the first fastening bolt 9, and the outer cutting blade 14 is installed and fixed in the blade positioning groove of the outer cutter pad 16 through the third fastening bolt 13, ensuring that the inner and outer cutting blades are stable and do not loosen during the operation of the tool.

[0063] The inner magnetic-absorbing tooth-shaped positioning block 5 and the outer magnetic-absorbing tooth-shaped positioning block 17 are respectively installed in the positioning grooves of the inner and outer cutter pads through the second fastening bolt 10 and the fourth fastening bolt 18. When the fastening bolts are loosened, the magnetic-absorbing tooth-shaped positioning blocks are adsorbed in the corresponding positioning grooves, and the inner and outer cutter pads can move; when the fastening bolts are tightened, the magnetic-absorbing tooth-shaped positioning blocks are lifted and meshed with the corresponding positioning tooth block grooves, and the inner and outer cutter pads are locked and cannot move.

[0064] The bottom dovetail blocks of the inner and outer tool pads respectively cooperate with the bottom dovetail grooves of the corresponding tool pad mounting grooves, restricting the lateral and longitudinal movement of the tool pads and retaining the radial movement of the tool pads. When the magnetic tooth-shaped positioning block and the positioning tooth block groove are in the released state, the inner tool pad 7 and the outer tool pad can move in the radial position. When the inner tool pad 7 and the outer tool pad 16 are at the "0" point position of the corresponding positioning tooth block groove, the inner and outer drill diameters of the core sampling device are d and D respectively. When the positions of the magnetic tooth-shaped positioning blocks on the inner tool pad 7 and the outer tool pad 16 are adjusted by n1 and n2 tooth pitches relative to the "0" point position of the positioning tooth block groove, new inner and outer drill diameters of d - n1×pi and D + n2×pi can be formed, and any required drill diameter / core sampling diameter nesting size specification core sampling device can be freely combined.

[0065] When the magnetic tooth-shaped positioning block and the positioning tooth block groove are engaged, the inner tool pad 7 and the outer tool pad 16 cannot move in all three dimensional directions, ensuring the stable positions of the inner tool pad 7 and the outer tool pad 16 during the operation of the core sampling device.

[0066] As Figures 1 to 3 shown in the variable diameter core sampling device, its specific working steps are as follows:

[0067] First step, connect the inner and outer cutting blades with the inner and outer tool pads respectively through fastening bolts and install and fix them in the corresponding blade mounting grooves.

[0068] Second step, install and fix the magnetic tooth-shaped positioning block in the corresponding positioning groove through a fastening bolt and make the magnetic tooth-shaped positioning block adsorb on the inner wall of the positioning groove.

[0069] Third step, the inner and outer tool pads cooperate with the dovetail grooves at the top of the working part 4 through the bottom dovetail blocks to form a slidable mechanism.

[0070] Fourth step, move the inner tool pad 7 and the outer tool pad 16 to the "0" point position of the corresponding positioning tooth block groove, and set the inner and outer drill diameters of the core sampling device at the "0" point position as d and D respectively.

[0071] Fifth step, adjust the magnetic tooth-shaped positioning block to be n1 and n2 tooth pitches relative to the "0" point position of the corresponding positioning tooth block groove, tighten the fastening bolt, lift the magnetic tooth-shaped positioning block to engage with the positioning tooth block groove, and fix the positions of the inner and outer tool pads. At this time, the inner and outer drill diameters of the core sampling device are d - n1×pi and D + n2×pi respectively.

[0072] Sixth step, according to the actual nesting situation of the workpiece, substitute the parameters into d - n1×pi and D + n2×pi, adjust the working state of the core sampling device, and obtain the actual required inner and outer drill diameters for core sampling to meet the working requirements.

[0073] The variable-diameter core-taking device and method for marine diesel engine cylinder blocks provided in the above embodiments of the present invention use a Morse taper shank as the connecting part, which can be applicable to various machine tools. A limiting groove is opened at the shoulder part of the tool device body to prevent the device from loosening and undergoing circumferential movement during operation. The cutter pad installation groove is provided with a radial positioning tooth block groove in the vertical direction. A straight tooth with a pitch of pi is opened on the positioning tooth block groove, and the "0" point position is adjusted. A dovetail groove is opened at the bottom of the installation groove to fix the cutter pad and ensure radial movement. The inner and outer cutting blades are fixed in the blade installation groove through fastening bolts to ensure the firm and stable position of the blades. A magnetic adsorption tooth-shaped positioning block with a pitch of pi is installed in the positioning groove and connected to the cutter pad through a fastening bolt to control whether the magnetic adsorption tooth-shaped positioning block and the positioning tooth block groove are engaged. When the fastening bolt is loosened, the magnetic adsorption tooth-shaped positioning block is adsorbed in the positioning groove, and the inner and outer cutter pads can move; when the fastening bolt is tightened, the magnetic adsorption tooth-shaped positioning block is lifted to engage with the positioning tooth block, and the inner and outer cutter pads are locked and cannot move. The dovetail blocks at the bottoms of the inner and outer cutter pads cooperate with the dovetail grooves of the tool body. When the magnetic adsorption tooth-shaped positioning block and the positioning tooth block are loosened, the inner and outer cutter pads can move radially and freely combine to form various required inner / outer drill diameters to meet the processing requirements of various core cutting sizes. When the magnetic adsorption tooth-shaped positioning block and the positioning tooth block are in the engaged state, the inner and outer cutter pads cannot move in the three-dimensional directions and remain locked, ensuring the stable position of the inner and outer cutter pads during the core cutting operation. By providing a pair of device bodies with dovetail grooves and positioning tooth blocks, the cutter pads and the device body are formed into a core cutting device with adjustable drill diameter and core-taking outer diameter through fastening bolts, which has the advantages of simplifying the operation difficulty, improving the core cutting operation efficiency, reducing the procurement cost, and being safe and reliable.

[0074] In the description of the above embodiments of the present invention, it should be noted that the terms "first", "second", etc. are used to distinguish similar objects and do not necessarily need to be used to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments of the present invention described here can be implemented in an order other than those illustrated or described here. The orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of simplifying the description of the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation of the present invention.

[0075] Matters not described in detail in the above embodiments of the present invention are all well-known technologies in the art.

[0076] The specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various deformations or modifications within the scope of the claims, which do not affect the essence of the present invention.

Claims

1. A variable-diameter core-taking device applicable to a marine diesel engine cylinder block, characterized in that, Comprising: The device body, an inner cutter pad, an outer cutter pad, an inner magnetic tooth-shaped positioning block, and an outer magnetic tooth-shaped positioning block; wherein: The device body includes a working part and a connecting part integrally formed and connected. A set of integrally connected cutter pad mounting grooves and spiral chip removal grooves are respectively formed in the radially symmetric directions of the working part. The inner cutter pad and the outer cutter pad are respectively arranged in the symmetrically arranged cutter pad mounting grooves. The inner magnetic tooth-shaped positioning block is installed on the inner cutter pad, and the outer magnetic tooth-shaped positioning block is installed on the outer cutter pad; A clamping part is formed between the magnetic tooth-shaped positioning block and the cutter pad mounting groove, and the cutter pad forms a sliding mechanism that can move radially relative to the cutter pad mounting groove through the clamping part; Radial positioning tooth block grooves and dovetail grooves are provided in the cutter pad mounting groove, and clamping parts are respectively formed between the magnetic tooth-shaped positioning blocks and the corresponding positioning tooth block grooves; the dovetail grooves are used to limit the relative lateral movement and longitudinal movement between the corresponding cutter pad and the cutter pad mounting groove, Both the inner cutter pad and the outer cutter pad include: a pad body, and a positioning groove, a blade mounting groove, and a bottom dovetail block provided on the pad body; wherein: the magnetic tooth-shaped positioning block is adjustably installed in the corresponding positioning groove through a fastening bolt, and the bottom dovetail block is adaptively connected with the corresponding cutter pad mounting groove to limit the relative lateral movement and longitudinal movement between the corresponding cutter pad and the cutter pad mounting groove; When the fastening bolt is loosened, the magnetic tooth-shaped positioning block is adsorbed in the corresponding positioning groove, and the corresponding cutter pad can move radially; When the fastening bolt is tightened, the magnetic tooth-shaped positioning block is engaged with the cutter pad mounting groove, and the corresponding cutter pad cannot move; When the cutter pad moves radially relative to the cutter pad mounting groove, various required inner drill diameters and outer drill diameter size specifications can be freely combined; When the inner cutter pad and the outer cutter pad are both in the initial position of the clamping part, the size specifications of the inner drill diameter and the outer drill diameter are d and D respectively. The inner magnetic tooth-shaped positioning block and the outer magnetic tooth-shaped positioning block are respectively adjusted radially inwards or outwards along the dovetail groove of the cutter pad mounting groove by n1 tooth pitches and n2 tooth pitches relative to the initial position of the corresponding clamping part, and new inner drill diameter and outer drill diameter size specifications of (d - n1×pi) and (D + n2×pi) are obtained, where pi is the tooth pitch of the tooth-shaped structure of the magnetic tooth-shaped positioning block.

2. The variable-diameter core-taking device applicable to the cylinder block of a marine diesel engine according to claim 1, characterized in that, The magnetic tooth-shaped positioning block and the positioning tooth block groove are mutually engaged through a mutually adapted tooth-shaped structure to form a clamping part.

3. The variable-diameter core-taking device applicable to the cylinder block of a marine diesel engine according to claim 1, wherein The initial position of the clamping part refers to an initial position set on the positioning tooth block groove radially arranged in the cutter pad mounting groove.

4. The variable-diameter core-taking device applicable to the cylinder block of a marine diesel engine according to claim 1, characterized in that, The connecting part adopts a Morse taper shank.

5. The variable-diameter core material device applicable to the cylinder block of a marine diesel engine according to any one of claims 1-4, characterized in that, Further comprising: Inner cutting blades and outer cutting blades; the inner cutting blades and the outer cutting blades are respectively installed on the inner cutter pad and the outer cutter pad.

6. A method for changing the diameter of the variable-diameter core-taking device according to claim 5, characterized in that, Comprising: Respectively installing and fixing the inner cutting blades and the outer cutting blades in the blade mounting grooves of the corresponding cutter pads; Fixing and installing the magnetic tooth-shaped positioning blocks in the positioning grooves of the corresponding cutter pads, and making the magnetic tooth-shaped positioning blocks adsorbed on the inner walls of the positioning grooves; Match the bottom dovetail block of the tool pad with the dovetail groove in the tool pad installation groove to form a sliding mechanism that can move relatively radially; Move the inner tool pad and the outer tool pad to the initial position of the positioning tooth block groove in the tool pad installation groove, and set the dimensional specifications of the inner drill diameter and the outer drill diameter of the core material taking device at the initial position to be d and D respectively; Adjust the tooth pitches of the inner magnetic tooth-shaped positioning block and the outer magnetic tooth-shaped positioning block relative to the initial positions of the corresponding positioning tooth block grooves to be n1 tooth pitches and n2 tooth pitches respectively; engage the magnetic tooth-shaped positioning block with the corresponding positioning tooth block groove to fix the position of the tool pad. At this time, the dimensional specifications of the inner drill diameter and the outer drill diameter of the core material taking device are (d - n1×pi) and (D + n2×pi) respectively, where pi is the tooth pitch of the tooth-shaped structure of the magnetic tooth-shaped positioning block; According to the actual core material taking situation of the workpiece, substitute the parameters into (d - n1×pi) and (D + n2×pi) respectively to adjust the inner drill diameter and the outer drill diameter of the core material taking device.

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