A tensioning mechanism

Abstract

The present application relates to a kind of tensioning mechanisms, including tensioning seat, tensioning cone surface and annular array setting are provided on tensioning seat telescopic hole;Connecting cone sleeve is fixed on tensioning seat;Supporting sleeve is fixed on tensioning seat, and with tensioning seat form annular telescopic groove;Tensioning sleeve annular array is provided with several tensioning grooves, end is provided with telescopic cone surface, is inserted in telescopic groove, and telescopic cone surface is slidably arranged on tensioning cone surface;Connecting plate is installed on tensioning sleeve, and annular array is arranged, and connecting plate is also inserted in telescopic hole;Pull rod sleeve is connected with connecting plate, and is inserted in tensioning seat;Connecting cone sleeve is used to be connected with machine tool spindle, and pull rod sleeve is used to be connected with machine tool pull rod, and machine tool pull rod pulls tensioning sleeve to machine tool spindle movement, and tensioning sleeve is tensioned on the inner hole of workpiece, and drive workpiece to be pressed on supporting sleeve.The tensioning mechanism is tensioned workpiece, and workpiece is not easy to deform, positioning accuracy is high, does not need to be centered, clamping speed is fast, efficiency is high, and machining precision is high.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of thin-walled part clamping mechanisms, especially a kind of expansion mechanism. BACKGROUND

[0002] Thin-walled part machining needs to be through bushing etc. Clamping to assist clamping, prevent thin-walled part deformation. Usually adopt open bushing to hold workpiece, although open bushing is convenient to use, but the wall thickness of open bushing is also limited, open bushing is easy to deform, when clamping, it can cause workpiece deformation, and the precision of open bushing positioning is not accurate, need to be centered detection, prevent part not on the axis of main shaft, especially in the case of higher tolerance requirement, need to be repeated centering, greatly influence the processing efficiency, at the same time, open bushing cannot meet the precision requirement. That is, the positioning precision of open bushing is low, inconvenient to use, cause workpiece deformation, affect the processing quality and processing efficiency SUMMARY

[0003] To solve the above problems, the present application provides a kind of expansion mechanism which can expand from the inside of thin-walled part, workpiece deformation is small, coaxiality is good, no need to center, the specific technical scheme is as follows:

[0004] An expansion mechanism, comprising: expansion seat, the expansion seat is equipped with expansion taper surface and annular array arrangement expansion hole;Connecting cone sleeve, the connecting cone sleeve is fixed on the expansion seat;Supporting sleeve, the supporting sleeve is fixed on the expansion seat, and forms annular expansion slot with the expansion seat;Expansion sleeve, the expansion sleeve is annular array equipped with a plurality of expansion grooves, the end of the expansion sleeve is equipped with expansion taper surface, the expansion sleeve is inserted in the expansion slot, and the expansion taper surface is slidably arranged on the expansion taper surface;Connecting plate, the connecting plate is installed on the expansion sleeve, and is annular array arrangement, the connecting plate is also inserted in the expansion hole, and is one-to-one corresponding with the expansion hole;And pull rod sleeve, the pull rod sleeve is connected with the connecting plate, and is inserted in the expansion seat;Wherein, the connecting cone sleeve is used for connecting with machine tool spindle, the pull rod sleeve is used for connecting with machine tool pull rod, the machine tool pull rod pulls the expansion sleeve to move towards the machine tool spindle, the expansion sleeve is expanded on the inner hole of workpiece, and drives the workpiece to be pressed on the supporting sleeve.

[0005] Preferably, it further comprises: connecting disc, the connecting disc is annular array equipped with a plurality of limiting grooves, the connecting plate is installed in the limiting groove;And connecting sleeve, the connecting sleeve is connected with the connecting disc through thread, the pull rod sleeve is inserted on the connecting disc, and the connecting sleeve is pressed on the connecting disc.

[0006] Preferably, the dustproof device comprises a connecting column connected with the connecting sleeve and a dustproof cover connected with the connecting column and provided with a dustproof groove opposite to the tensioning seat.

[0007] Preferably, the elastic glue is filled in the tensioning groove.

[0008] Preferably, the limiting screw is connected with the connecting plate and movably inserted in the tensioning seat, and the limiting screw is arranged in an annular array and corresponds to the connecting plate one by one.

[0009] Further, the counterweight screw is installed on the tensioning seat and located on both sides of the limiting screw for adjusting dynamic balance.

[0010] Preferably, the mistake-proof block is fixed on the outer circle of the supporting sleeve and arranged opposite to the workpiece.

[0011] Preferably, the annular array of the supporting sleeve arranged opposite to the workpiece is provided with a plurality of supporting bosses.

[0012] Preferably, the first adjusting ring is installed on the pull rod sleeve.

[0013] Preferably, the gas detection device comprises a gas detection gas path arranged on the supporting sleeve and the tensioning seat, an air outlet of the gas detection gas path arranged on an end face of the supporting sleeve opposite to the workpiece and arranged in an annular array and provided with a plurality of gas outlets, and a gas pipe joint installed on the tensioning seat and communicated with the gas detection gas path.

[0014] Compared with the prior art, the present application has the following beneficial effects:

[0015] The tensioning mechanism provided by the present application can tension the workpiece from the inner circular surface of the thin-walled workpiece, the workpiece is not easy to deform, the positioning accuracy of the workpiece is high, the workpiece does not need to be centered, the workpiece is clamped at a high speed, the efficiency is improved, the machining precision is ensured, the tensioning is realized through the pull rod of the machine tool, the structure is compact, and the mechanism is convenient to disassemble and assemble. Whether the workpiece is installed and whether the axis is coincident are detected through gas detection, automatic centering detection is realized, and automatic production is facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a first perspective view of a tensioning mechanism;

[0017] Figure 2 is a second perspective view of a tensioning mechanism;

[0018] Figure 3 is a third perspective view of the tensioning mechanism;

[0019] Figure 4 is a fourth perspective view of the tensioning mechanism;

[0020] Figure 5 is a structural schematic view of the tensioning seat;

[0021] Figure 6 is a front view of the tensioning seat;

[0022] Figure 7 is a structural schematic view of the tensioning seat and the supporting sleeve hidden;

[0023] Figure 8 is an exploded schematic view of the connecting plate, the pull rod sleeve, the connecting disc, and the connecting sleeve;

[0024] Figure 9 is a structural schematic view of the connecting disc;

[0025] Figure 10 is a structural schematic view of the tensioning sleeve;

[0026] Figure 11 is a structural schematic view of the workpiece installed;

[0027] Figure 12 is a sectional view of the workpiece installed. DETAILED DESCRIPTION

[0028] The present application will be further described in conjunction with the accompanying drawings.

[0029] Example 1

[0030] As shown in Figures 1 to 12 , a tensioning mechanism includes a tensioning seat 1, a connecting cone sleeve 40, a supporting sleeve 2, a tensioning sleeve 3, a connecting plate 52, a pull rod sleeve 4, a connecting disc 51, a connecting sleeve 53, and a limiting screw 54.

[0031] The connecting cone sleeve 40 is fixed on the top of the tensioning seat 1, and the connecting cone sleeve 40 is provided with a connecting cone hole 401.

[0032] The tightening ring 12 is provided with a tightening taper surface 11 and an expansion hole 13, and the expansion hole 13 is arranged in a circular array along the axis and has three. One end of the support sleeve 2 is fixed on the tightening seat 1 and arranged coaxially with the tightening seat 1. The other end of the tightening seat 1 is provided with six support bosses 21 arranged in a circular array, which reduces the contact area between the support sleeve 2 and the end face of the workpiece 9, thereby improving the positioning accuracy and reliability, and facilitating processing. The support sleeve 2 and the tightening ring 12 form an expansion groove 10, the expansion sleeve 3 is movably inserted into the expansion groove 10, the expansion sleeve 3 is provided with a plurality of expansion grooves 31 arranged in a circular array, and the end of the expansion sleeve 3 is provided with an expansion taper surface 32 located on the inner surface of the expansion sleeve 3, and the expansion taper surface 32 is slidably arranged on the tightening taper surface 11.

[0033] The connecting plate 52 is provided with three arranged in a circular array, one end of the connecting plate 52 is fixed on the end of the expansion sleeve 3, the other end is connected with the connecting disc 51, and the connecting plate 52 is also movably inserted into the expansion hole 13 of the tightening seat 1, and the connecting plate 52 corresponds to the expansion hole 13 one by one.

[0034] The limiting screw 54 is connected with the connecting plate 52 and movably inserted into the tightening seat 1, and the limiting screw 54 is arranged in a circular array and has three corresponding to the connecting plate 52. The nut of the limiting screw 54 is located at the top of the tightening seat 1, and in a free state, the limiting screw 54 limits the position of the expansion sleeve 3 to prevent the expansion sleeve 3 from being separated from the tightening seat 1.

[0035] The connecting disc 51 is provided with a connecting ring 511, and the connecting ring 511 is provided with three limiting grooves 512 arranged in a circular array, and the connecting plate 52 is located in the limiting groove 512. The pull rod sleeve 4 is provided with a pull rod shoulder 41 and a pull rod hole 42 at the top, the first adjusting ring 56 is arranged in the pull rod hole 42, the pull rod hole 42 is connected with the machine tool pull rod 83, the first adjusting ring 56 makes the end of the machine tool pull rod 83 tightly pressed in the pull rod hole 42, realizes reliable fixation, prevents loosening, and further ensures that the expansion mechanism and the workpiece 9 will not change position when rotating, and ensures the machining accuracy. The other end of the pull rod sleeve 4 is provided with a connecting screw hole 43, the connecting screw hole 43 is connected with the outer thread of the connecting sleeve 53, the connecting flange 531 at the bottom of the connecting sleeve 53 is tightly pressed on the connecting ring 511 of the connecting disc 51, the pull rod shoulder 41 is clamped on the top of the connecting disc 51, and the connecting disc 51 and the connecting flange 531 realize the fixation of the pull rod sleeve 4. The connecting disc 51 and the connecting sleeve 53 are convenient to disassemble and assemble, convenient to maintain or replace different expansion sleeves 3 or pull rod sleeves 4, and convenient to use with different machine tools and workpieces 9.

[0036] The outer surface of the support sleeve 2 is provided with an error prevention block 57, and the error prevention block 57 is also arranged opposite to the workpiece 9, which is convenient for the installation of the workpiece 9.

[0037] The top of the tightening seat 1 is also provided with a plurality of counterweight screws 55, which are located on both sides of the limiting screw 54 and used for adjusting dynamic balance.

[0038] The connecting tapered sleeve 40 is used to connect with the machine tool spindle, and the tie rod sleeve 4 is used to connect with the machine tool tie rod 83. The machine tool tie rod 83 pulls the tensioning sleeve 3 to move towards the machine tool spindle. The tensioning sleeve 3 is tensioned on the inner hole of the workpiece 9 and drives the workpiece 9 to press against the support sleeve 2.

[0039] During operation, the connecting tapered sleeve 40 is inserted into the machine tool spindle, and the connecting tapered hole 401 rests against the machine tool spindle for positioning, making the tensioning mechanism coaxial with the machine tool spindle. The pull rod sleeve 4 is connected to the machine tool pull rod 83. Then, the workpiece 9 is inserted into the tensioning sleeve 3, and the end of the workpiece 9 abuts against the support boss 21 at the end of the support sleeve 2. At the same time, the anti-misalignment block 57 abuts against the workpiece 9 to limit the circumferential direction of the workpiece 9. Then, the machine tool pull rod 83 is started, and the machine tool pull rod 83 drives the pull rod sleeve 4 to move towards the machine tool spindle. The pull rod sleeve 4 drives the tensioning sleeve 3 to move towards the machine tool spindle through the connecting plate 52. At this time, the tensioning sleeve 3 is pushed outward under the action of the telescopic tapered surface 32 and the tensioning tapered surface 11. The outer circular surface of the tensioning sleeve 3 contacts the inner circular surface of the workpiece 9 and is tensioned on the inner circular surface of the workpiece 9. At the same time, the end face of the workpiece 9 is pressed against the support boss 21 to achieve the clamping of the workpiece 9. Because the outer circular surface formed by the tensioning sleeve 3 during tensioning always coincides with the axis of the tensioning sleeve 3, it ensures that the axis of the workpiece 9 after tensioning coincides with the axis of the machine tool spindle, thus eliminating the need for centering and ensuring high positioning accuracy. Since the tensioning is internal and the amount of tension is small, and the tensioning force is evenly distributed across the entire inner circular surface, the inner circular surface of the workpiece 9 is not easily deformed. This ensures both clamping force and prevents workpiece 9 from deforming, effectively guaranteeing machining accuracy. Tensioning is achieved through the machine tool tie rod 83, resulting in a compact structure and convenient use.

[0040] Example 2

[0041] like Figures 1 to 12 As shown, based on the above embodiment, a dustproof device is also included. The dustproof device includes a connecting column 71, a dust cover 6, and a second adjusting ring 72. The connecting column 71 is mounted on the connecting flange 531 of the connecting sleeve 53. The connecting column 71 has a hollow structure and four weight-reducing holes 711 arranged in a circular array on it. The hollow structure and the weight-reducing holes 711 reduce weight. The other end of the connecting column 71 is connected to the dust cover 6 by screws, and the second adjusting ring 72 is installed between the dust cover 6 and the connecting column 71. The dust cover 6 has a dustproof groove 61 that is opposite to the tension ring 12 of the tensioning seat 1, and the dustproof groove 61 is movably inserted into the top of the tension ring 12. The second adjusting ring 72 is used to adjust the gap between the dustproof groove 61 and the tension ring 12 to prevent interference. The dust cover 6 effectively prevents waste generated during processing from entering the interior of the mechanism, ensuring the accuracy of the mechanism, extending its service life, reducing maintenance frequency, and making its use more stable and reliable.

[0042] Example 3

[0043] As Figures 1 to 12 shown, on the basis of the above embodiment two, also includes elastic glue, elastic glue filled in the tension groove 31, prevent debris from the tension groove 31 into the inside.

[0044] Example four

[0045] As Figures 1 to 12 shown, on the basis of the above embodiment, also includes: gas detection device, gas detection device includes gas detection gas path and gas pipe joint 81. Gas detection gas path includes the outflow port 23, first gas path 22 and second gas path 14 communicated in turn, wherein the outflow port 23 is arranged on the support boss 21, and annular array is provided with three, the first gas path 22 is arranged in the inside of the support sleeve 2, the second gas path 14 is arranged on the tension seat 1, the gas pipe joint 81 passes through the air hole 513 of the connecting disc 51, and is installed on the tension seat 1, and is communicated with the second gas path 14. The gas pipe joint 81 can be connected with the air inlet pipe 82 through the hose. The air inlet pipe 82 is movably inserted in the inside of the machine tool pull rod 83, and the air inlet pipe 82 is also inserted in the pull rod sleeve 4. The air hole 513 is a waist-shaped hole, which reduces the weight and realizes dynamic balance. The connecting cone sleeve 40 is provided with an annular air groove 402, which is communicated with the three second gas paths 14, thereby reducing the use amount of the gas pipe joint 81 and making the structure compact. The air groove 402 is provided with sealing rings on both sides. The pressure sensor connected with the gas detection gas path can detect the change of pressure, so as to judge whether there is a workpiece 9 and whether the workpiece 9 is in close contact with the support boss 21. Based on the principle of determining a plane by three points, if the detected pressure change does not meet the requirements, it indicates that the workpiece 9 fails to fully contact with the support boss 21, and the axis of the workpiece 9 does not coincide with the axis of the machine tool spindle, so the workpiece 9 needs to be clamped again, without manually centering the workpiece 9, thereby ensuring the accuracy of positioning and improving the machining precision and clamping efficiency.

[0046] The tensioning mechanism is mainly applied to numerical control lathes and is used for positioning and clamping of thin-walled workpieces. The workpiece positioning is accurate and the deformation is small. The mechanism is tensioned and positioned by the machine tool pull rod. The middle part has an air pipe, which can be used for air blowing cleaning. The top part is provided with a dustproof cover, which prevents foreign matters from entering and increases the service life.

[0047] The dynamic balance deviation is less than 4g, and the runout of the positioning surface is less than 0.02.

[0048] The technical principles of the present application are described above in combination with specific embodiments. These descriptions are only for explaining the principles of the present application, and cannot be interpreted as limiting the protection scope of the present application in any way. Based on the explanations herein, other specific embodiments of the present application can be conceived by those skilled in the art without creative labor, and these embodiments will fall within the protection scope of the claims of the present application.

Claims

1. A take-up mechanism, characterized in that The utility model relates to a kind of machine tool workpiece support, including: Tensioning seat (1), the tensioning seat (1) is equipped with tensioning taper (11) and annular array setting telescopic hole (13); Connecting cone sleeve (40), the connecting cone sleeve (40) is fixed on the tensioning seat (1); Support sleeve (2), the support sleeve (2) is fixed on the tensioning seat (1), and with the tensioning seat (1) form annular telescopic groove (10); Tensioning sleeve (3), the tensioning sleeve (3) is equipped with a plurality of tensioning groove (31) in annular array, the end of the tensioning sleeve (3) is equipped with telescopic taper (32), the tensioning sleeve (3) is inserted in the telescopic groove (10), the telescopic taper (32) is slid against the tensioning taper (11); Connecting plate (52), the connecting plate (52) is installed on the tensioning sleeve (3), and annular array is arranged, the connecting plate (52) is also inserted in the telescopic hole (13), and with the telescopic hole (13) one-to-one correspondence;And Pull rod sleeve (4), the pull rod sleeve (4) is connected with the connecting plate (52), and is inserted in the tensioning seat (1); Wherein, the connecting cone sleeve (40) is used for being connected with machine tool main shaft, the pull rod sleeve (4) is used for being connected with machine tool pull rod (83), the machine tool pull rod (83) pulls the tensioning sleeve (3) and moves towards the machine tool main shaft, the tensioning sleeve (3) is tensioned on the inner hole of workpiece (9), and drives the workpiece (9) and is pressed on the support sleeve (2); Also include: connecting disc (51), the connecting disc (51) is equipped with a plurality of limit groove (512) in annular array, the connecting plate (52) is installed in the limit groove (512);And Connecting sleeve (53), the connecting sleeve (53) is connected with the connecting disc (51) by thread, the pull rod sleeve (4) is inserted on the connecting disc (51), and the connecting sleeve (53) is pressed on the connecting disc (51) with the pull rod sleeve (4); The pull rod sleeve (4) is equipped with pull rod hole (42), and the first adjusting ring (56) is contained in the pull rod hole (42); Also include: gas detection device, the gas detection device includes: Gas detection gas path, the gas detection gas path is arranged on the support sleeve (2) and the tensioning seat (1), and the gas outlet (23) of the gas detection gas path is arranged on the end face of the support sleeve (2) opposite to the workpiece (9), and is equipped with multiple in annular array;And Air pipe joint (81), the air pipe joint (81) is installed on the tensioning seat (1), and is communicated with the gas detection gas path.

2. A take-up mechanism according to claim 1, characterised in that Also include dustproof device, the dustproof device includes: Connecting column (71), the connecting column (71) is connected with the connecting sleeve (53);And Dust cover (6), the dust cover (6) is connected with the connecting column (71), and the dust cover (6) is equipped with dustproof groove (61) opposite to the tensioning seat (1).

3. A take-up mechanism according to claim 2, wherein Also include elastic glue, the elastic glue is filled in the tensioning groove (31).

4. A take-up mechanism according to claim 1, wherein Also include: A limiting screw (54) is connected with the connecting plate (52) and movably inserted on the tension seat (1), the limiting screw (54) is arranged in an annular array and corresponds to the connecting plate (52) one by one.

5. A take-up mechanism according to claim 4, wherein Further comprising: A counterweight screw (55) is installed on the tension seat (1) and located on both sides of the limiting screw (54) for adjusting dynamic balance.

6. A take-up mechanism according to claim 1, wherein Further comprising: An error-proof block (57) is fixed on the outer circle of the support sleeve (2) and arranged opposite to the workpiece (9).

7. A take-up mechanism according to claim 1, wherein The end of the support sleeve (2) arranged opposite to the workpiece (9) is annularly arranged with a plurality of support bosses (21).

8. A take-up mechanism according to claim 1, wherein Further comprising: A first adjusting ring (56) is installed on the pull rod sleeve (4).

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